* pull request: sfc-next 2012-07-18
@ 2012-07-18 18:16 Ben Hutchings
2012-07-18 18:19 ` [PATCH net-next 1/7] sfc: Add explicit RX queue flag to channel Ben Hutchings
` (6 more replies)
0 siblings, 7 replies; 23+ messages in thread
From: Ben Hutchings @ 2012-07-18 18:16 UTC (permalink / raw)
To: David Miller; +Cc: linux-net-drivers, netdev, Andrew Jackson, Richard Cochran
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The following changes since commit f150bd7f8cf742c4cdd0c929aa494ef72f7f5b13:
driver: net: ethernet: cpsw: runtime PM support (2012-07-18 09:40:54 -0700)
are available in the git repository at:
git://git.kernel.org/pub/scm/linux/kernel/git/bwh/sfc-next.git for-davem
(commit 2482aab313c3657557f1dad4c1b20c0934b84919)
This adds PTP hardware timestamping support for SFC9000-family
controllers with the appropriate peripheral (currently SFN5322F and
SFN6322F boards).
Ben.
Ben Hutchings (3):
sfc: Support variable-length response to MCDI GET_BOARD_CFG
sfc: Expose FPGA bitfile partition through MTD
sfc: Bump version to 3.2
Stuart Hodgson (4):
sfc: Add explicit RX queue flag to channel
sfc: Add channel specific receive_skb handler and post_remove callback
sfc: Allow efx_mcdi_rpc to be called in two parts
sfc: Add support for IEEE-1588 PTP
drivers/net/ethernet/sfc/Kconfig | 7 +
drivers/net/ethernet/sfc/Makefile | 1 +
drivers/net/ethernet/sfc/efx.c | 17 +-
drivers/net/ethernet/sfc/efx.h | 1 +
drivers/net/ethernet/sfc/ethtool.c | 1 +
drivers/net/ethernet/sfc/mcdi.c | 44 +-
drivers/net/ethernet/sfc/mcdi.h | 6 +
drivers/net/ethernet/sfc/mcdi_pcol.h | 1 +
drivers/net/ethernet/sfc/mtd.c | 7 +-
drivers/net/ethernet/sfc/net_driver.h | 29 +-
drivers/net/ethernet/sfc/nic.h | 31 +
drivers/net/ethernet/sfc/ptp.c | 1519 +++++++++++++++++++++++++++++++++
drivers/net/ethernet/sfc/rx.c | 20 +-
drivers/net/ethernet/sfc/siena.c | 1 +
drivers/net/ethernet/sfc/tx.c | 6 +
15 files changed, 1673 insertions(+), 18 deletions(-)
create mode 100644 drivers/net/ethernet/sfc/ptp.c
--
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.
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^ permalink raw reply [flat|nested] 23+ messages in thread* [PATCH net-next 1/7] sfc: Add explicit RX queue flag to channel 2012-07-18 18:16 pull request: sfc-next 2012-07-18 Ben Hutchings @ 2012-07-18 18:19 ` Ben Hutchings 2012-07-18 18:20 ` [PATCH net-next 2/7] sfc: Add channel specific receive_skb handler and post_remove callback Ben Hutchings ` (5 subsequent siblings) 6 siblings, 0 replies; 23+ messages in thread From: Ben Hutchings @ 2012-07-18 18:19 UTC (permalink / raw) To: David Miller; +Cc: netdev, linux-net-drivers, Andrew Jackson, Richard Cochran The PTP channel will have its own RX queue even though it's not a regular traffic channel. Original work by Ben Hutchings <bhutchings@solarflare.com> Signed-off-by: Stuart Hodgson <smhodgson@solarflare.com> Signed-off-by: Ben Hutchings <bhutchings@solarflare.com> --- drivers/net/ethernet/sfc/efx.c | 8 +++++++- drivers/net/ethernet/sfc/net_driver.h | 5 ++++- drivers/net/ethernet/sfc/rx.c | 7 +++++-- 3 files changed, 16 insertions(+), 4 deletions(-) diff --git a/drivers/net/ethernet/sfc/efx.c b/drivers/net/ethernet/sfc/efx.c index 70554a1..3ae6774 100644 --- a/drivers/net/ethernet/sfc/efx.c +++ b/drivers/net/ethernet/sfc/efx.c @@ -1422,10 +1422,16 @@ static void efx_set_channels(struct efx_nic *efx) efx->tx_channel_offset = separate_tx_channels ? efx->n_channels - efx->n_tx_channels : 0; - /* We need to adjust the TX queue numbers if we have separate + /* We need to mark which channels really have RX and TX + * queues, and adjust the TX queue numbers if we have separate * RX-only and TX-only channels. */ efx_for_each_channel(channel, efx) { + if (channel->channel < efx->n_rx_channels) + channel->rx_queue.core_index = channel->channel; + else + channel->rx_queue.core_index = -1; + efx_for_each_channel_tx_queue(tx_queue, channel) tx_queue->queue -= (efx->tx_channel_offset * EFX_TXQ_TYPES); diff --git a/drivers/net/ethernet/sfc/net_driver.h b/drivers/net/ethernet/sfc/net_driver.h index 55be2fd..3894593 100644 --- a/drivers/net/ethernet/sfc/net_driver.h +++ b/drivers/net/ethernet/sfc/net_driver.h @@ -242,6 +242,8 @@ struct efx_rx_page_state { /** * struct efx_rx_queue - An Efx RX queue * @efx: The associated Efx NIC + * @core_index: Index of network core RX queue. Will be >= 0 iff this + * is associated with a real RX queue. * @buffer: The software buffer ring * @rxd: The hardware descriptor ring * @ptr_mask: The size of the ring minus 1. @@ -263,6 +265,7 @@ struct efx_rx_page_state { */ struct efx_rx_queue { struct efx_nic *efx; + int core_index; struct efx_rx_buffer *buffer; struct efx_special_buffer rxd; unsigned int ptr_mask; @@ -1044,7 +1047,7 @@ static inline bool efx_tx_queue_used(struct efx_tx_queue *tx_queue) static inline bool efx_channel_has_rx_queue(struct efx_channel *channel) { - return channel->channel < channel->efx->n_rx_channels; + return channel->rx_queue.core_index >= 0; } static inline struct efx_rx_queue * diff --git a/drivers/net/ethernet/sfc/rx.c b/drivers/net/ethernet/sfc/rx.c index 6d1c6cf..3f598bf 100644 --- a/drivers/net/ethernet/sfc/rx.c +++ b/drivers/net/ethernet/sfc/rx.c @@ -478,7 +478,7 @@ static void efx_rx_packet_gro(struct efx_channel *channel, skb->ip_summed = ((rx_buf->flags & EFX_RX_PKT_CSUMMED) ? CHECKSUM_UNNECESSARY : CHECKSUM_NONE); - skb_record_rx_queue(skb, channel->channel); + skb_record_rx_queue(skb, channel->rx_queue.core_index); gro_result = napi_gro_frags(napi); } else { @@ -570,6 +570,9 @@ static void efx_rx_deliver(struct efx_channel *channel, /* Set the SKB flags */ skb_checksum_none_assert(skb); + /* Record the rx_queue */ + skb_record_rx_queue(skb, channel->rx_queue.core_index); + /* Pass the packet up */ netif_receive_skb(skb); @@ -607,7 +610,7 @@ void __efx_rx_packet(struct efx_channel *channel, struct efx_rx_buffer *rx_buf) * at the ethernet header */ skb->protocol = eth_type_trans(skb, efx->net_dev); - skb_record_rx_queue(skb, channel->channel); + skb_record_rx_queue(skb, channel->rx_queue.core_index); } if (unlikely(!(efx->net_dev->features & NETIF_F_RXCSUM))) -- 1.7.7.6 -- Ben Hutchings, Staff Engineer, Solarflare Not speaking for my employer; that's the marketing department's job. They asked us to note that Solarflare product names are trademarked. ^ permalink raw reply related [flat|nested] 23+ messages in thread
* [PATCH net-next 2/7] sfc: Add channel specific receive_skb handler and post_remove callback 2012-07-18 18:16 pull request: sfc-next 2012-07-18 Ben Hutchings 2012-07-18 18:19 ` [PATCH net-next 1/7] sfc: Add explicit RX queue flag to channel Ben Hutchings @ 2012-07-18 18:20 ` Ben Hutchings 2012-07-18 18:32 ` David Miller 2012-07-18 18:20 ` [PATCH net-next 3/7] sfc: Allow efx_mcdi_rpc to be called in two parts Ben Hutchings ` (4 subsequent siblings) 6 siblings, 1 reply; 23+ messages in thread From: Ben Hutchings @ 2012-07-18 18:20 UTC (permalink / raw) To: David Miller; +Cc: netdev, linux-net-drivers, Andrew Jackson, Richard Cochran Allows an extra channel to override the standard receive_skb handler and also for extra non generic operations to be performed on remove. Also set default rx strategy so only skbs can be delivered to the PTP receive function. Signed-off-by: Stuart Hodgson <smhodgson@solarflare.com> Signed-off-by: Ben Hutchings <bhutchings@solarflare.com> --- drivers/net/ethernet/sfc/efx.c | 6 ++++++ drivers/net/ethernet/sfc/efx.h | 1 + drivers/net/ethernet/sfc/net_driver.h | 3 +++ drivers/net/ethernet/sfc/rx.c | 15 ++++++++++++--- 4 files changed, 22 insertions(+), 3 deletions(-) diff --git a/drivers/net/ethernet/sfc/efx.c b/drivers/net/ethernet/sfc/efx.c index 3ae6774..1c53d4b 100644 --- a/drivers/net/ethernet/sfc/efx.c +++ b/drivers/net/ethernet/sfc/efx.c @@ -714,6 +714,7 @@ static void efx_remove_channel(struct efx_channel *channel) efx_for_each_possible_channel_tx_queue(tx_queue, channel) efx_remove_tx_queue(tx_queue); efx_remove_eventq(channel); + channel->type->post_remove(channel); } static void efx_remove_channels(struct efx_nic *efx) @@ -828,6 +829,7 @@ void efx_schedule_slow_fill(struct efx_rx_queue *rx_queue) static const struct efx_channel_type efx_default_channel_type = { .pre_probe = efx_channel_dummy_op_int, + .post_remove = efx_channel_dummy_op_void, .get_name = efx_get_channel_name, .copy = efx_copy_channel, .keep_eventq = false, @@ -838,6 +840,10 @@ int efx_channel_dummy_op_int(struct efx_channel *channel) return 0; } +void efx_channel_dummy_op_void(struct efx_channel *channel) +{ +} + /************************************************************************** * * Port handling diff --git a/drivers/net/ethernet/sfc/efx.h b/drivers/net/ethernet/sfc/efx.h index be8f915..121441f 100644 --- a/drivers/net/ethernet/sfc/efx.h +++ b/drivers/net/ethernet/sfc/efx.h @@ -96,6 +96,7 @@ static inline void efx_filter_rfs_expire(struct efx_channel *channel) {} /* Channels */ extern int efx_channel_dummy_op_int(struct efx_channel *channel); +extern void efx_channel_dummy_op_void(struct efx_channel *channel); extern void efx_process_channel_now(struct efx_channel *channel); extern int efx_realloc_channels(struct efx_nic *efx, u32 rxq_entries, u32 txq_entries); diff --git a/drivers/net/ethernet/sfc/net_driver.h b/drivers/net/ethernet/sfc/net_driver.h index 3894593..9913e32 100644 --- a/drivers/net/ethernet/sfc/net_driver.h +++ b/drivers/net/ethernet/sfc/net_driver.h @@ -393,14 +393,17 @@ struct efx_channel { * @get_name: Generate the channel's name (used for its IRQ handler) * @copy: Copy the channel state prior to reallocation. May be %NULL if * reallocation is not supported. + * @receive_skb: Handle an skb ready to be passed to netif_receive_skb() * @keep_eventq: Flag for whether event queue should be kept initialised * while the device is stopped */ struct efx_channel_type { void (*handle_no_channel)(struct efx_nic *); int (*pre_probe)(struct efx_channel *); + void (*post_remove)(struct efx_channel *); void (*get_name)(struct efx_channel *, char *buf, size_t len); struct efx_channel *(*copy)(const struct efx_channel *); + void (*receive_skb)(struct efx_channel *, struct sk_buff *); bool keep_eventq; }; diff --git a/drivers/net/ethernet/sfc/rx.c b/drivers/net/ethernet/sfc/rx.c index 3f598bf..92699a0 100644 --- a/drivers/net/ethernet/sfc/rx.c +++ b/drivers/net/ethernet/sfc/rx.c @@ -573,8 +573,11 @@ static void efx_rx_deliver(struct efx_channel *channel, /* Record the rx_queue */ skb_record_rx_queue(skb, channel->rx_queue.core_index); - /* Pass the packet up */ - netif_receive_skb(skb); + /* Does the channel want to handle the skb */ + if (channel->type->receive_skb) + channel->type->receive_skb(channel, skb); + else + netif_receive_skb(skb); /* Update allocation strategy method */ channel->rx_alloc_level += RX_ALLOC_FACTOR_SKB; @@ -616,7 +619,8 @@ void __efx_rx_packet(struct efx_channel *channel, struct efx_rx_buffer *rx_buf) if (unlikely(!(efx->net_dev->features & NETIF_F_RXCSUM))) rx_buf->flags &= ~EFX_RX_PKT_CSUMMED; - if (likely(rx_buf->flags & (EFX_RX_BUF_PAGE | EFX_RX_PKT_CSUMMED))) + if (likely(rx_buf->flags & (EFX_RX_BUF_PAGE | EFX_RX_PKT_CSUMMED)) && + !channel->type->receive_skb) efx_rx_packet_gro(channel, rx_buf, eh); else efx_rx_deliver(channel, rx_buf); @@ -626,6 +630,11 @@ void efx_rx_strategy(struct efx_channel *channel) { enum efx_rx_alloc_method method = rx_alloc_method; + if (channel->type->receive_skb) { + channel->rx_alloc_push_pages = false; + return; + } + /* Only makes sense to use page based allocation if GRO is enabled */ if (!(channel->efx->net_dev->features & NETIF_F_GRO)) { method = RX_ALLOC_METHOD_SKB; -- 1.7.7.6 ^ permalink raw reply related [flat|nested] 23+ messages in thread
* Re: [PATCH net-next 2/7] sfc: Add channel specific receive_skb handler and post_remove callback 2012-07-18 18:20 ` [PATCH net-next 2/7] sfc: Add channel specific receive_skb handler and post_remove callback Ben Hutchings @ 2012-07-18 18:32 ` David Miller 2012-07-18 18:42 ` Ben Hutchings 0 siblings, 1 reply; 23+ messages in thread From: David Miller @ 2012-07-18 18:32 UTC (permalink / raw) To: bhutchings; +Cc: netdev, linux-net-drivers, ajackson, richardcochran From: Ben Hutchings <bhutchings@solarflare.com> Date: Wed, 18 Jul 2012 19:20:00 +0100 > + void (*receive_skb)(struct efx_channel *, struct sk_buff *); This looks to me like a conduit for proprietary features implemented in a binary-only blob. I understand how you're using here for PTP, but you're really openning the door for things I really wouldn't be very happy about. ^ permalink raw reply [flat|nested] 23+ messages in thread
* Re: [PATCH net-next 2/7] sfc: Add channel specific receive_skb handler and post_remove callback 2012-07-18 18:32 ` David Miller @ 2012-07-18 18:42 ` Ben Hutchings 2012-07-18 18:43 ` David Miller 0 siblings, 1 reply; 23+ messages in thread From: Ben Hutchings @ 2012-07-18 18:42 UTC (permalink / raw) To: David Miller; +Cc: netdev, linux-net-drivers, ajackson, richardcochran On Wed, 2012-07-18 at 11:32 -0700, David Miller wrote: > From: Ben Hutchings <bhutchings@solarflare.com> > Date: Wed, 18 Jul 2012 19:20:00 +0100 > > > + void (*receive_skb)(struct efx_channel *, struct sk_buff *); > > This looks to me like a conduit for proprietary features implemented > in a binary-only blob. > > I understand how you're using here for PTP, but you're really openning > the door for things I really wouldn't be very happy about. Through all the functions that, er, aren't exported? Even in the out-of-tree version of sfc there is no receive path hook any more; I converted the client driver that wanted it (which is under GNU GPL, thank you very much) to use netfilter. Ben. -- Ben Hutchings, Staff Engineer, Solarflare Not speaking for my employer; that's the marketing department's job. They asked us to note that Solarflare product names are trademarked. ^ permalink raw reply [flat|nested] 23+ messages in thread
* Re: [PATCH net-next 2/7] sfc: Add channel specific receive_skb handler and post_remove callback 2012-07-18 18:42 ` Ben Hutchings @ 2012-07-18 18:43 ` David Miller 0 siblings, 0 replies; 23+ messages in thread From: David Miller @ 2012-07-18 18:43 UTC (permalink / raw) To: bhutchings; +Cc: netdev, linux-net-drivers, ajackson, richardcochran From: Ben Hutchings <bhutchings@solarflare.com> Date: Wed, 18 Jul 2012 19:42:42 +0100 > On Wed, 2012-07-18 at 11:32 -0700, David Miller wrote: >> From: Ben Hutchings <bhutchings@solarflare.com> >> Date: Wed, 18 Jul 2012 19:20:00 +0100 >> >> > + void (*receive_skb)(struct efx_channel *, struct sk_buff *); >> >> This looks to me like a conduit for proprietary features implemented >> in a binary-only blob. >> >> I understand how you're using here for PTP, but you're really openning >> the door for things I really wouldn't be very happy about. > > Through all the functions that, er, aren't exported? > > Even in the out-of-tree version of sfc there is no receive path hook any > more; I converted the client driver that wanted it (which is under GNU > GPL, thank you very much) to use netfilter. Fair enough, in light of that this doesn't bother me so much :) ^ permalink raw reply [flat|nested] 23+ messages in thread
* [PATCH net-next 3/7] sfc: Allow efx_mcdi_rpc to be called in two parts 2012-07-18 18:16 pull request: sfc-next 2012-07-18 Ben Hutchings 2012-07-18 18:19 ` [PATCH net-next 1/7] sfc: Add explicit RX queue flag to channel Ben Hutchings 2012-07-18 18:20 ` [PATCH net-next 2/7] sfc: Add channel specific receive_skb handler and post_remove callback Ben Hutchings @ 2012-07-18 18:20 ` Ben Hutchings 2012-07-18 18:21 ` [PATCH net-next 4/7] sfc: Add support for IEEE-1588 PTP Ben Hutchings ` (3 subsequent siblings) 6 siblings, 0 replies; 23+ messages in thread From: Ben Hutchings @ 2012-07-18 18:20 UTC (permalink / raw) To: David Miller; +Cc: netdev, linux-net-drivers, Andrew Jackson, Richard Cochran For NIC/System time synchonisation efx_mcdi_rpc needs to be split in efx_mcdi_rpc_start and efx_mcdi_rpc_finish operations. Signed-off-by: Stuart Hodgson <smhodgson@solarflare.com> Signed-off-by: Ben Hutchings <bhutchings@solarflare.com> --- drivers/net/ethernet/sfc/mcdi.c | 26 +++++++++++++++++++++++--- drivers/net/ethernet/sfc/mcdi.h | 6 ++++++ 2 files changed, 29 insertions(+), 3 deletions(-) diff --git a/drivers/net/ethernet/sfc/mcdi.c b/drivers/net/ethernet/sfc/mcdi.c index fc5e7bb..294df4b 100644 --- a/drivers/net/ethernet/sfc/mcdi.c +++ b/drivers/net/ethernet/sfc/mcdi.c @@ -320,14 +320,20 @@ static void efx_mcdi_ev_cpl(struct efx_nic *efx, unsigned int seqno, efx_mcdi_complete(mcdi); } -/* Issue the given command by writing the data into the shared memory PDU, - * ring the doorbell and wait for completion. Copyout the result. */ int efx_mcdi_rpc(struct efx_nic *efx, unsigned cmd, const u8 *inbuf, size_t inlen, u8 *outbuf, size_t outlen, size_t *outlen_actual) { + efx_mcdi_rpc_start(efx, cmd, inbuf, inlen); + return efx_mcdi_rpc_finish(efx, cmd, inlen, + outbuf, outlen, outlen_actual); +} + +void efx_mcdi_rpc_start(struct efx_nic *efx, unsigned cmd, const u8 *inbuf, + size_t inlen) +{ struct efx_mcdi_iface *mcdi = efx_mcdi(efx); - int rc; + BUG_ON(efx_nic_rev(efx) < EFX_REV_SIENA_A0); efx_mcdi_acquire(mcdi); @@ -338,6 +344,15 @@ int efx_mcdi_rpc(struct efx_nic *efx, unsigned cmd, spin_unlock_bh(&mcdi->iface_lock); efx_mcdi_copyin(efx, cmd, inbuf, inlen); +} + +int efx_mcdi_rpc_finish(struct efx_nic *efx, unsigned cmd, size_t inlen, + u8 *outbuf, size_t outlen, size_t *outlen_actual) +{ + struct efx_mcdi_iface *mcdi = efx_mcdi(efx); + int rc; + + BUG_ON(efx_nic_rev(efx) < EFX_REV_SIENA_A0); if (mcdi->mode == MCDI_MODE_POLL) rc = efx_mcdi_poll(efx); @@ -563,6 +578,11 @@ void efx_mcdi_process_event(struct efx_channel *channel, case MCDI_EVENT_CODE_FLR: efx_sriov_flr(efx, MCDI_EVENT_FIELD(*event, FLR_VF)); break; + case MCDI_EVENT_CODE_PTP_RX: + case MCDI_EVENT_CODE_PTP_FAULT: + case MCDI_EVENT_CODE_PTP_PPS: + efx_ptp_event(efx, event); + break; default: netif_err(efx, hw, efx->net_dev, "Unknown MCDI event 0x%x\n", diff --git a/drivers/net/ethernet/sfc/mcdi.h b/drivers/net/ethernet/sfc/mcdi.h index 0bdf3e3..dc25caa 100644 --- a/drivers/net/ethernet/sfc/mcdi.h +++ b/drivers/net/ethernet/sfc/mcdi.h @@ -71,6 +71,12 @@ extern int efx_mcdi_rpc(struct efx_nic *efx, unsigned cmd, const u8 *inbuf, size_t inlen, u8 *outbuf, size_t outlen, size_t *outlen_actual); +extern void efx_mcdi_rpc_start(struct efx_nic *efx, unsigned cmd, + const u8 *inbuf, size_t inlen); +extern int efx_mcdi_rpc_finish(struct efx_nic *efx, unsigned cmd, size_t inlen, + u8 *outbuf, size_t outlen, + size_t *outlen_actual); + extern int efx_mcdi_poll_reboot(struct efx_nic *efx); extern void efx_mcdi_mode_poll(struct efx_nic *efx); extern void efx_mcdi_mode_event(struct efx_nic *efx); -- 1.7.7.6 -- Ben Hutchings, Staff Engineer, Solarflare Not speaking for my employer; that's the marketing department's job. They asked us to note that Solarflare product names are trademarked. ^ permalink raw reply related [flat|nested] 23+ messages in thread
* [PATCH net-next 4/7] sfc: Add support for IEEE-1588 PTP 2012-07-18 18:16 pull request: sfc-next 2012-07-18 Ben Hutchings ` (2 preceding siblings ...) 2012-07-18 18:20 ` [PATCH net-next 3/7] sfc: Allow efx_mcdi_rpc to be called in two parts Ben Hutchings @ 2012-07-18 18:21 ` Ben Hutchings 2012-07-19 14:25 ` Richard Cochran 2012-07-18 18:21 ` [PATCH net-next 5/7] sfc: Support variable-length response to MCDI GET_BOARD_CFG Ben Hutchings ` (2 subsequent siblings) 6 siblings, 1 reply; 23+ messages in thread From: Ben Hutchings @ 2012-07-18 18:21 UTC (permalink / raw) To: David Miller; +Cc: netdev, linux-net-drivers, Andrew Jackson, Richard Cochran Add PTP IEEE-1588 support and make accesible via the PHC subsystem. This work is based on prior code by Andrew Jackson Signed-off-by: Stuart Hodgson <smhodgson@solarflare.com> Signed-off-by: Ben Hutchings <bhutchings@solarflare.com> --- drivers/net/ethernet/sfc/Kconfig | 7 + drivers/net/ethernet/sfc/Makefile | 1 + drivers/net/ethernet/sfc/efx.c | 3 + drivers/net/ethernet/sfc/ethtool.c | 1 + drivers/net/ethernet/sfc/mcdi_pcol.h | 1 + drivers/net/ethernet/sfc/net_driver.h | 19 +- drivers/net/ethernet/sfc/nic.h | 31 + drivers/net/ethernet/sfc/ptp.c | 1519 +++++++++++++++++++++++++++++++++ drivers/net/ethernet/sfc/rx.c | 2 +- drivers/net/ethernet/sfc/siena.c | 1 + drivers/net/ethernet/sfc/tx.c | 6 + 11 files changed, 1589 insertions(+), 2 deletions(-) create mode 100644 drivers/net/ethernet/sfc/ptp.c diff --git a/drivers/net/ethernet/sfc/Kconfig b/drivers/net/ethernet/sfc/Kconfig index fb3cbc2..78c5d435 100644 --- a/drivers/net/ethernet/sfc/Kconfig +++ b/drivers/net/ethernet/sfc/Kconfig @@ -34,3 +34,10 @@ config SFC_SRIOV This enables support for the SFC9000 I/O Virtualization features, allowing accelerated network performance in virtualized environments. +config SFC_PTP + bool "Solarflare SFC9000-family PTP support" + depends on SFC && PTP_1588_CLOCK + default y + ---help--- + This enables support for the Precision Time Protocol (PTP) + on SFC9000-family NICs diff --git a/drivers/net/ethernet/sfc/Makefile b/drivers/net/ethernet/sfc/Makefile index ea1f8db..e11f2ec 100644 --- a/drivers/net/ethernet/sfc/Makefile +++ b/drivers/net/ethernet/sfc/Makefile @@ -5,5 +5,6 @@ sfc-y += efx.o nic.o falcon.o siena.o tx.o rx.o filter.o \ mcdi.o mcdi_phy.o mcdi_mon.o sfc-$(CONFIG_SFC_MTD) += mtd.o sfc-$(CONFIG_SFC_SRIOV) += siena_sriov.o +sfc-$(CONFIG_SFC_PTP) += ptp.o obj-$(CONFIG_SFC) += sfc.o diff --git a/drivers/net/ethernet/sfc/efx.c b/drivers/net/ethernet/sfc/efx.c index 1c53d4b..e6631f0e 100644 --- a/drivers/net/ethernet/sfc/efx.c +++ b/drivers/net/ethernet/sfc/efx.c @@ -1748,6 +1748,9 @@ static int efx_ioctl(struct net_device *net_dev, struct ifreq *ifr, int cmd) EFX_ASSERT_RESET_SERIALISED(efx); + if (cmd == SIOCSHWTSTAMP) + return efx_ptp_ioctl(efx, ifr, cmd); + /* Convert phy_id from older PRTAD/DEVAD format */ if ((cmd == SIOCGMIIREG || cmd == SIOCSMIIREG) && (data->phy_id & 0xfc00) == 0x0400) diff --git a/drivers/net/ethernet/sfc/ethtool.c b/drivers/net/ethernet/sfc/ethtool.c index 10536f9..50cdd39 100644 --- a/drivers/net/ethernet/sfc/ethtool.c +++ b/drivers/net/ethernet/sfc/ethtool.c @@ -1170,6 +1170,7 @@ const struct ethtool_ops efx_ethtool_ops = { .get_rxfh_indir_size = efx_ethtool_get_rxfh_indir_size, .get_rxfh_indir = efx_ethtool_get_rxfh_indir, .set_rxfh_indir = efx_ethtool_set_rxfh_indir, + .get_ts_info = efx_ptp_get_ts_info, .get_module_info = efx_ethtool_get_module_info, .get_module_eeprom = efx_ethtool_get_module_eeprom, }; diff --git a/drivers/net/ethernet/sfc/mcdi_pcol.h b/drivers/net/ethernet/sfc/mcdi_pcol.h index 0310b9f0..0017f98 100644 --- a/drivers/net/ethernet/sfc/mcdi_pcol.h +++ b/drivers/net/ethernet/sfc/mcdi_pcol.h @@ -290,6 +290,7 @@ #define MCDI_EVENT_CODE_TX_FLUSH 0xc /* enum */ #define MCDI_EVENT_CODE_PTP_RX 0xd /* enum */ #define MCDI_EVENT_CODE_PTP_FAULT 0xe /* enum */ +#define MCDI_EVENT_CODE_PTP_PPS 0xf /* enum */ #define MCDI_EVENT_CMDDONE_DATA_OFST 0 #define MCDI_EVENT_CMDDONE_DATA_LBN 0 #define MCDI_EVENT_CMDDONE_DATA_WIDTH 32 diff --git a/drivers/net/ethernet/sfc/net_driver.h b/drivers/net/ethernet/sfc/net_driver.h index 9913e32..f84a5d5 100644 --- a/drivers/net/ethernet/sfc/net_driver.h +++ b/drivers/net/ethernet/sfc/net_driver.h @@ -56,7 +56,8 @@ #define EFX_MAX_CHANNELS 32U #define EFX_MAX_RX_QUEUES EFX_MAX_CHANNELS #define EFX_EXTRA_CHANNEL_IOV 0 -#define EFX_MAX_EXTRA_CHANNELS 1U +#define EFX_EXTRA_CHANNEL_PTP 1 +#define EFX_MAX_EXTRA_CHANNELS 2U /* Checksum generation is a per-queue option in hardware, so each * queue visible to the networking core is backed by two hardware TX @@ -68,6 +69,9 @@ #define EFX_TXQ_TYPES 4 #define EFX_MAX_TX_QUEUES (EFX_TXQ_TYPES * EFX_MAX_CHANNELS) +/* Forward declare Precision Time Protocol (PTP) support structure. */ +struct efx_ptp_data; + struct efx_self_tests; /** @@ -736,6 +740,7 @@ struct vfdi_status; * %local_addr_list. Protected by %local_lock. * @local_lock: Mutex protecting %local_addr_list and %local_page_list. * @peer_work: Work item to broadcast peer addresses to VMs. + * @ptp_data: PTP state data * @monitor_work: Hardware monitor workitem * @biu_lock: BIU (bus interface unit) lock * @last_irq_cpu: Last CPU to handle a possible test interrupt. This @@ -860,6 +865,10 @@ struct efx_nic { struct work_struct peer_work; #endif +#ifdef CONFIG_SFC_PTP + struct efx_ptp_data *ptp_data; +#endif + /* The following fields may be written more often */ struct delayed_work monitor_work ____cacheline_aligned_in_smp; @@ -1122,5 +1131,13 @@ static inline void clear_bit_le(unsigned nr, unsigned char *addr) #define EFX_MAX_FRAME_LEN(mtu) \ ((((mtu) + ETH_HLEN + VLAN_HLEN + 4/* FCS */ + 7) & ~7) + 16) +static inline bool efx_xmit_with_hwtstamp(struct sk_buff *skb) +{ + return skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP; +} +static inline void efx_xmit_hwtstamp_pending(struct sk_buff *skb) +{ + skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS; +} #endif /* EFX_NET_DRIVER_H */ diff --git a/drivers/net/ethernet/sfc/nic.h b/drivers/net/ethernet/sfc/nic.h index bab5cd9..cd53ab5 100644 --- a/drivers/net/ethernet/sfc/nic.h +++ b/drivers/net/ethernet/sfc/nic.h @@ -250,6 +250,37 @@ extern int efx_sriov_get_vf_config(struct net_device *dev, int vf, extern int efx_sriov_set_vf_spoofchk(struct net_device *net_dev, int vf, bool spoofchk); +struct ethtool_ts_info; +#ifdef CONFIG_SFC_PTP +extern void efx_ptp_probe(struct efx_nic *efx); +extern int efx_ptp_ioctl(struct efx_nic *efx, struct ifreq *ifr, int cmd); +extern int efx_ptp_get_ts_info(struct net_device *net_dev, + struct ethtool_ts_info *ts_info); +extern bool efx_ptp_is_ptp_tx(struct efx_nic *efx, struct sk_buff *skb); +extern int efx_ptp_tx(struct efx_nic *efx, struct sk_buff *skb); +extern void efx_ptp_event(struct efx_nic *efx, efx_qword_t *ev); +#else +static inline void efx_ptp_probe(struct efx_nic *efx) {} +static inline int efx_ptp_ioctl(struct efx_nic *efx, struct ifreq *ifr, int cmd) +{ + return -EOPNOTSUPP; +} +static inline int efx_ptp_get_ts_info(struct net_device *net_dev, + struct ethtool_ts_info *ts_info) +{ + return -EOPNOTSUPP; +} +static inline bool efx_ptp_is_ptp_tx(struct efx_nic *efx, struct sk_buff *skb) +{ + return false; +} +static inline int efx_ptp_tx(struct efx_nic *efx, struct sk_buff *skb) +{ + return NETDEV_TX_OK; +} +static inline void efx_ptp_event(struct efx_nic *efx, efx_qword_t *ev) {} +#endif + extern const struct efx_nic_type falcon_a1_nic_type; extern const struct efx_nic_type falcon_b0_nic_type; extern const struct efx_nic_type siena_a0_nic_type; diff --git a/drivers/net/ethernet/sfc/ptp.c b/drivers/net/ethernet/sfc/ptp.c new file mode 100644 index 0000000..ba1e76a --- /dev/null +++ b/drivers/net/ethernet/sfc/ptp.c @@ -0,0 +1,1519 @@ +/**************************************************************************** + * Driver for Solarflare Solarstorm network controllers and boards + * Copyright 2011 Solarflare Communications Inc. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published + * by the Free Software Foundation, incorporated herein by reference. + */ + +/* Theory of operation: + * + * PTP support is assisted by firmware running on the MC, which provides + * the hardware timestamping capabilities. Both transmitted and received + * PTP event packets are queued onto internal queues for subsequent processing; + * this is because the MC operations are relatively long and would block + * block NAPI/interrupt operation. + * + * Receive event processing: + * The event contains the packet's UUID and sequence number, together + * with the hardware timestamp. The PTP receive packet queue is searched + * for this UUID/sequence number and, if found, put on a pending queue. + * Packets not matching are delivered without timestamps (MCDI events will + * always arrive after the actual packet). + * It is important for the operation of the PTP protocol that the ordering + * of packets between the event and general port is maintained. + * + * Work queue processing: + * If work waiting, synchronise host/hardware time + * + * Transmit: send packet through MC, which returns the transmission time + * that is converted to an appropriate timestamp. + * + * Receive: the packet's reception time is converted to an appropriate + * timestamp. + */ +#include <linux/ip.h> +#include <linux/udp.h> +#include <linux/time.h> +#include <linux/ktime.h> +#include <linux/module.h> +#include <linux/net_tstamp.h> +#include <linux/ptp_clock_kernel.h> +#include "net_driver.h" +#include "efx.h" +#include "mcdi.h" +#include "mcdi_pcol.h" +#include "io.h" +#include "regs.h" +#include "nic.h" + +/* Maximum number of events expected to make up a PTP event */ +#define MAX_EVENT_FRAGS 3 + +/* Maximum delay, ms, to begin synchronisation */ +#define MAX_SYNCHRONISE_WAIT_MS 2 + +/* How long, at most, to spend synchronising */ +#define SYNCHRONISE_PERIOD_NS 250000 + +/* How often to update the shared memory time */ +#define SYNCHRONISATION_GRANULARITY_NS 200 + +/* Minimum permitted length of a (corrected) synchronisation time */ +#define MIN_SYNCHRONISATION_NS 120 + +/* Maximum permitted length of a (corrected) synchronisation time */ +#define MAX_SYNCHRONISATION_NS 1000 + +/* How many (MC) receive events that can be queued */ +#define MAX_RECEIVE_EVENTS 8 + +/* Length of (modified) moving average. */ +#define AVERAGE_LENGTH 16 + +/* How long an unmatched event or packet can be held */ +#define PKT_EVENT_LIFETIME_MS 10 + +/* Offsets into PTP packet for identification. These offsets are from the + * start of the IP header, not the MAC header. Note that neither PTP V1 nor + * PTP V2 permit the use of IPV4 options. + */ +#define PTP_DPORT_OFFSET 22 + +#define PTP_V1_VERSION_LENGTH 2 +#define PTP_V1_VERSION_OFFSET 28 + +#define PTP_V1_UUID_LENGTH 6 +#define PTP_V1_UUID_OFFSET 50 + +#define PTP_V1_SEQUENCE_LENGTH 2 +#define PTP_V1_SEQUENCE_OFFSET 58 + +/* The minimum length of a PTP V1 packet for offsets, etc. to be valid: + * includes IP header. + */ +#define PTP_V1_MIN_LENGTH 64 + +#define PTP_V2_VERSION_LENGTH 1 +#define PTP_V2_VERSION_OFFSET 29 + +/* Although PTP V2 UUIDs are comprised a ClockIdentity (8) and PortNumber (2), + * the MC only captures the last six bytes of the clock identity. These values + * reflect those, not the ones used in the standard. The standard permits + * mapping of V1 UUIDs to V2 UUIDs with these same values. + */ +#define PTP_V2_MC_UUID_LENGTH 6 +#define PTP_V2_MC_UUID_OFFSET 50 + +#define PTP_V2_SEQUENCE_LENGTH 2 +#define PTP_V2_SEQUENCE_OFFSET 58 + +/* The minimum length of a PTP V2 packet for offsets, etc. to be valid: + * includes IP header. + */ +#define PTP_V2_MIN_LENGTH 63 + +#define PTP_MIN_LENGTH 63 + +#define PTP_ADDRESS 0xe0000181 /* 224.0.1.129 */ +#define PTP_EVENT_PORT 319 +#define PTP_GENERAL_PORT 320 + +/* Annoyingly the format of the version numbers are different between + * versions 1 and 2 so it isn't possible to simply look for 1 or 2. + */ +#define PTP_VERSION_V1 1 + +#define PTP_VERSION_V2 2 +#define PTP_VERSION_V2_MASK 0x0f + +enum ptp_packet_state { + PTP_PACKET_STATE_UNMATCHED = 0, + PTP_PACKET_STATE_MATCHED, + PTP_PACKET_STATE_TIMED_OUT, + PTP_PACKET_STATE_MATCH_UNWANTED +}; + +/* NIC synchronised with single word of time only comprising + * partial seconds and full nanoseconds: 10^9 ~ 2^30 so 2 bits for seconds. + */ +#define MC_NANOSECOND_BITS 30 +#define MC_NANOSECOND_MASK ((1 << MC_NANOSECOND_BITS) - 1) +#define MC_SECOND_MASK ((1 << (32 - MC_NANOSECOND_BITS)) - 1) + +/* Maximum parts-per-billion adjustment that is acceptable */ +#define MAX_PPB 1000000 + +/* Number of bits required to hold the above */ +#define MAX_PPB_BITS 20 + +/* Number of extra bits allowed when calculating fractional ns. + * EXTRA_BITS + MC_CMD_PTP_IN_ADJUST_BITS + MAX_PPB_BITS should + * be less than 63. + */ +#define PPB_EXTRA_BITS 2 + +/* Precalculate scale word to avoid long long division at runtime */ +#define PPB_SCALE_WORD ((1LL << (PPB_EXTRA_BITS + MC_CMD_PTP_IN_ADJUST_BITS +\ + MAX_PPB_BITS)) / 1000000000LL) + +#define PTP_SYNC_ATTEMPTS 4 + +/** + * struct efx_ptp_match - Matching structure, stored in sk_buff's cb area. + * @words: UUID and (partial) sequence number + * @expiry: Time after which the packet should be delivered irrespective of + * event arrival. + * @state: The state of the packet - whether it is ready for processing or + * whether that is of no interest. + */ +struct efx_ptp_match { + u32 words[DIV_ROUND_UP(PTP_V1_UUID_LENGTH, 4)]; + unsigned long expiry; + enum ptp_packet_state state; +}; + +/** + * struct efx_ptp_event_rx - A PTP receive event (from MC) + * @seq0: First part of (PTP) UUID + * @seq1: Second part of (PTP) UUID and sequence number + * @hwtimestamp: Event timestamp + */ +struct efx_ptp_event_rx { + struct list_head link; + u32 seq0; + u32 seq1; + ktime_t hwtimestamp; + unsigned long expiry; +}; + +/** + * struct efx_ptp_timeset - Synchronisation between host and MC + * @host_start: Host time immediately before hardware timestamp taken + * @seconds: Hardware timestamp, seconds + * @nanoseconds: Hardware timestamp, nanoseconds + * @host_end: Host time immediately after hardware timestamp taken + * @waitns: Number of nanoseconds between hardware timestamp being read and + * host end time being seen + * @window: Difference of host_end and host_start + * @valid: Whether this timeset is valid + */ +struct efx_ptp_timeset { + u32 host_start; + u32 seconds; + u32 nanoseconds; + u32 host_end; + u32 waitns; + u32 window; /* Derived: end - start, allowing for wrap */ +}; + +/** + * struct efx_ptp_data - Precision Time Protocol (PTP) state + * @channel: The PTP channel + * @rxq: Receive queue (awaiting timestamps) + * @txq: Transmit queue + * @evt_list: List of MC receive events awaiting packets + * @evt_free_list: List of free events + * @evt_lock: Lock for manipulating evt_list and evt_free_list + * @rx_evts: Instantiated events (on evt_list and evt_free_list) + * @workwq: Work queue for processing pending PTP operations + * @work: Work task + * @reset_required: A serious error has occurred and the PTP task needs to be + * reset (disable, enable). + * @rxfilter_event: Receive filter when operating + * @rxfilter_general: Receive filter when operating + * @config: Current timestamp configuration + * @enabled: PTP operation enabled + * @mode: Mode in which PTP operating (PTP version) + * @evt_frags: Partly assembled PTP events + * @evt_frag_idx: Current fragment number + * @evt_code: Last event code + * @start: Address at which MC indicates ready for synchronisation + * @host_base_time: (Synchronised with mc_base_time) host time + * @mc_base_time: (Synchronised with host_base_time) MC/hardware time + * @base_time_valid: Whether host_base_time and mc_base_time are synchronised + * @last_sync_ns: Last number of nanoseconds between readings when synchronising + * @base_sync_ns: Number of nanoseconds for last synchronisation. + * @base_sync_valid: Whether base_sync_time is valid. + * @current_adjfreq: Current ppb adjustment. + * @phc_clock: Pointer to registered phc device + * @phc_clock_info: Registration structure for phc device + * @pps_work: pps work task for handling pps events + * @pps_workwq: pps work queue + * @nic_ts_enabled: Flag indicating if NIC generated TS events are handled + * @txbuf: Buffer for use when transmitting (PTP) packets to MC (avoids + * allocations in main data path). + * @debug_ptp_dir: PTP debugfs directory + * @missed_rx_sync: Number of packets received without syncrhonisation. + * @good_syncs: Number of successful synchronisations. + * @no_time_syncs: Number of synchronisations with no good times. + * @bad_sync_durations: Number of synchronisations with bad durations. + * @bad_syncs: Number of failed synchronisations. + * @last_sync_time: Number of nanoseconds for last synchronisation. + * @sync_timeouts: Number of synchronisation timeouts + * @fast_syncs: Number of synchronisations requiring short delay + * @min_sync_delta: Minimum time between event and synchronisation + * @max_sync_delta: Maximum time between event and synchronisation + * @average_sync_delta: Average time between event and synchronisation. + * Modified moving average. + * @last_sync_delta: Last time between event and synchronisation + * @mc_stats: Context value for MC statistics + * @timeset: Last set of synchronisation statistics. + */ +struct efx_ptp_data { + struct efx_channel *channel; + struct sk_buff_head rxq; + struct sk_buff_head txq; + struct list_head evt_list; + struct list_head evt_free_list; + spinlock_t evt_lock; + struct efx_ptp_event_rx rx_evts[MAX_RECEIVE_EVENTS]; + struct workqueue_struct *workwq; + struct work_struct work; + bool reset_required; + u32 rxfilter_event; + u32 rxfilter_general; + bool rxfilter_installed; + struct hwtstamp_config config; + bool enabled; + unsigned int mode; + efx_qword_t evt_frags[MAX_EVENT_FRAGS]; + int evt_frag_idx; + int evt_code; + struct efx_buffer start; + ktime_t host_base_time; + ktime_t mc_base_time; + bool base_time_valid; + unsigned last_sync_ns; + unsigned base_sync_ns; + bool base_sync_valid; + s64 current_adjfreq; + struct ptp_clock *phc_clock; + struct ptp_clock_info phc_clock_info; + struct work_struct pps_work; + struct workqueue_struct *pps_workwq; + bool nic_ts_enabled; + u8 txbuf[ALIGN(MC_CMD_PTP_IN_TRANSMIT_LEN( + MC_CMD_PTP_IN_TRANSMIT_PACKET_MAXNUM), 4)]; + struct efx_ptp_timeset + timeset[MC_CMD_PTP_OUT_SYNCHRONIZE_TIMESET_MAXNUM]; +}; + +static int efx_phc_adjfreq(struct ptp_clock_info *ptp, s32 delta); +static int efx_phc_adjtime(struct ptp_clock_info *ptp, s64 delta); +static int efx_phc_gettime(struct ptp_clock_info *ptp, struct timespec *ts); +static int efx_phc_settime(struct ptp_clock_info *ptp, + const struct timespec *e_ts); +static int efx_phc_enable(struct ptp_clock_info *ptp, + struct ptp_clock_request *request, int on); + +/* Enable MCDI PTP support. */ +static int efx_ptp_enable(struct efx_nic *efx) +{ + u8 inbuf[MC_CMD_PTP_IN_ENABLE_LEN]; + + MCDI_SET_DWORD(inbuf, PTP_IN_OP, MC_CMD_PTP_OP_ENABLE); + MCDI_SET_DWORD(inbuf, PTP_IN_ENABLE_QUEUE, + efx->ptp_data->channel->channel); + MCDI_SET_DWORD(inbuf, PTP_IN_ENABLE_MODE, efx->ptp_data->mode); + + return efx_mcdi_rpc(efx, MC_CMD_PTP, inbuf, sizeof(inbuf), + NULL, 0, NULL); +} + +/* Disable MCDI PTP support. + * + * Note that this function should never rely on the presence of ptp_data - + * may be called before that exists. + */ +static int efx_ptp_disable(struct efx_nic *efx) +{ + u8 inbuf[MC_CMD_PTP_IN_DISABLE_LEN]; + + MCDI_SET_DWORD(inbuf, PTP_IN_OP, MC_CMD_PTP_OP_DISABLE); + return efx_mcdi_rpc(efx, MC_CMD_PTP, inbuf, sizeof(inbuf), + NULL, 0, NULL); +} + +static void efx_ptp_deliver_rx_queue(struct sk_buff_head *q) +{ + struct sk_buff *skb; + + while ((skb = skb_dequeue(q))) { + local_bh_disable(); + netif_receive_skb(skb); + local_bh_enable(); + } +} + +static void efx_ptp_handle_no_channel(struct efx_nic *efx) +{ + netif_err(efx, drv, efx->net_dev, + "ERROR: PTP requires MSI-X and 1 additional interrupt" + "vector. PTP disabled\n"); +} + +/* Repeatedly send the host time to the MC which will capture the hardware + * time. + */ +static void efx_ptp_send_times(struct efx_nic *efx, struct timespec *last_time) +{ + struct timespec now; + struct timespec limit; + struct efx_ptp_data *ptp = efx->ptp_data; + struct timespec start; + int *mc_running = ptp->start.addr; + + getnstimeofday(&now); + start = now; + limit = now; + timespec_add_ns(&limit, SYNCHRONISE_PERIOD_NS); + + /* Write host time for specified period or until MC is done */ + while ((timespec_compare(&now, &limit) < 0) && + ACCESS_ONCE(*mc_running)) { + struct timespec update_time; + unsigned int host_time; + + /* Don't update continuously to avoid saturating the PCIe bus */ + update_time = now; + timespec_add_ns(&update_time, SYNCHRONISATION_GRANULARITY_NS); + do { + getnstimeofday(&now); + } while ((timespec_compare(&now, &update_time) < 0) && + ACCESS_ONCE(*mc_running)); + + /* Synchronise NIC with single word of time only */ + host_time = (now.tv_sec << MC_NANOSECOND_BITS) | now.tv_nsec; + /* Update host time in NIC memory */ + _efx_writed(efx, host_time, + FR_CZ_MC_TREG_SMEM + MC_SMEM_P0_PTP_TIME_OFST); + } + *last_time = now; + start = timespec_sub(now, start); +} + +/* Read a timeset from the MC's results and partial process. */ +static void efx_ptp_read_timeset(u8 *data, struct efx_ptp_timeset *timeset) +{ + unsigned start_ns, end_ns; + + timeset->host_start = MCDI_DWORD(data, PTP_OUT_SYNCHRONIZE_HOSTSTART); + timeset->seconds = MCDI_DWORD(data, PTP_OUT_SYNCHRONIZE_SECONDS); + timeset->nanoseconds = MCDI_DWORD(data, + PTP_OUT_SYNCHRONIZE_NANOSECONDS); + timeset->host_end = MCDI_DWORD(data, PTP_OUT_SYNCHRONIZE_HOSTEND), + timeset->waitns = MCDI_DWORD(data, PTP_OUT_SYNCHRONIZE_WAITNS); + + /* Ignore seconds */ + start_ns = timeset->host_start & MC_NANOSECOND_MASK; + end_ns = timeset->host_end & MC_NANOSECOND_MASK; + /* Allow for rollover */ + if (end_ns < start_ns) + end_ns += NSEC_PER_SEC; + /* Determine duration of operation */ + timeset->window = end_ns - start_ns; +} + +/* Process times received from MC. + * + * Extract times from returned results, and establish the minimum value + * seen. The minimum value represents the "best" possible time and events + * too much greater than this are rejected - the machine is, perhaps, too + * busy. A number of readings are taken so that, hopefully, at least one good + * synchronisation will be seen in the results. + */ +static int efx_ptp_process_times(struct efx_nic *efx, u8 *synch_buf, + size_t response_length, + struct timespec *last_time) +{ + unsigned number_readings = (response_length / + MC_CMD_PTP_OUT_SYNCHRONIZE_TIMESET_LEN); + unsigned i; + unsigned min; + unsigned min_set = 0; + unsigned total; + unsigned ngood = 0; + unsigned last_good = 0; + struct efx_ptp_data *ptp = efx->ptp_data; + bool min_valid = false; + u32 last_sec; + u32 start_sec; + + if (number_readings == 0) + return -EAGAIN; + + /* Find minimum value in this set of results, discarding clearly + * erroneous results. + */ + for (i = 0; i < number_readings; i++) { + efx_ptp_read_timeset(synch_buf, &ptp->timeset[i]); + synch_buf += MC_CMD_PTP_OUT_SYNCHRONIZE_TIMESET_LEN; + if (ptp->timeset[i].window > SYNCHRONISATION_GRANULARITY_NS) { + if (min_valid) { + if (ptp->timeset[i].window < min_set) + min_set = ptp->timeset[i].window; + } else { + min_valid = true; + min_set = ptp->timeset[i].window; + } + } + } + + if (min_valid) { + if (ptp->base_sync_valid && (min_set > ptp->base_sync_ns)) + min = ptp->base_sync_ns; + else + min = min_set; + } else { + min = SYNCHRONISATION_GRANULARITY_NS; + } + + /* Discard excessively long synchronise durations. The MC times + * when it finishes reading the host time so the corrected window + * time should be fairly constant for a given platform. + */ + total = 0; + for (i = 0; i < number_readings; i++) + if (ptp->timeset[i].window > ptp->timeset[i].waitns) { + unsigned win; + + win = ptp->timeset[i].window - ptp->timeset[i].waitns; + if (win >= MIN_SYNCHRONISATION_NS && + win < MAX_SYNCHRONISATION_NS) { + total += ptp->timeset[i].window; + ngood++; + last_good = i; + } + } + + if (ngood == 0) { + netif_warn(efx, drv, efx->net_dev, + "PTP no suitable synchronisations %dns %dns\n", + ptp->base_sync_ns, min_set); + return -EAGAIN; + } + + /* Average minimum this synchronisation */ + ptp->last_sync_ns = DIV_ROUND_UP(total, ngood); + if (!ptp->base_sync_valid || (ptp->last_sync_ns < ptp->base_sync_ns)) { + ptp->base_sync_valid = true; + ptp->base_sync_ns = ptp->last_sync_ns; + } + + ptp->mc_base_time = ktime_set(ptp->timeset[last_good].seconds, + ptp->timeset[last_good].nanoseconds); + last_time->tv_nsec = + ptp->timeset[last_good].host_start & MC_NANOSECOND_MASK; + + /* It is possible that the seconds rolled over between taking + * the start reading and the last value written by the host. The + * timescales are such that a gap of more than one second is never + * expected. + */ + start_sec = ptp->timeset[last_good].host_start >> MC_NANOSECOND_BITS; + last_sec = last_time->tv_sec & MC_SECOND_MASK; + if (start_sec != last_sec) { + if (((start_sec + 1) & MC_SECOND_MASK) != last_sec) { + netif_warn(efx, hw, efx->net_dev, + "PTP bad synchronisation seconds\n"); + return -EAGAIN; + } else { + last_time->tv_sec--; + } + } + ptp->host_base_time = ktime_set(last_time->tv_sec, + last_time->tv_nsec); + + /* At least one good synchronisation */ + ptp->base_time_valid = true; + + return 0; +} + +/* Synchronize times between the host and the MC */ +static int efx_ptp_synchronize(struct efx_nic *efx, unsigned int num_readings) +{ + struct efx_ptp_data *ptp = efx->ptp_data; + u8 synch_buf[MC_CMD_PTP_OUT_SYNCHRONIZE_LENMAX]; + size_t response_length; + int rc; + unsigned long timeout; + struct timespec last_time; + unsigned int loops = 0; + int *start = ptp->start.addr; + + last_time.tv_sec = 0; + last_time.tv_nsec = 0; + + MCDI_SET_DWORD(synch_buf, PTP_IN_OP, MC_CMD_PTP_OP_SYNCHRONIZE); + MCDI_SET_DWORD(synch_buf, PTP_IN_SYNCHRONIZE_NUMTIMESETS, + num_readings); + MCDI_SET_DWORD(synch_buf, PTP_IN_SYNCHRONIZE_START_ADDR_LO, + (u32)ptp->start.dma_addr); + MCDI_SET_DWORD(synch_buf, PTP_IN_SYNCHRONIZE_START_ADDR_HI, + (u32)((u64)ptp->start.dma_addr >> 32)); + + /* Clear flag that signals MC ready */ + ACCESS_ONCE(*start) = 0; + efx_mcdi_rpc_start(efx, MC_CMD_PTP, synch_buf, + MC_CMD_PTP_IN_SYNCHRONIZE_LEN); + + /* Wait for start from MCDI (or timeout) */ + timeout = jiffies + msecs_to_jiffies(MAX_SYNCHRONISE_WAIT_MS); + while (!ACCESS_ONCE(*start) && (time_before(jiffies, timeout))) { + udelay(20); /* Usually start MCDI execution quickly */ + loops++; + } + + if (ACCESS_ONCE(*start)) + efx_ptp_send_times(efx, &last_time); + + /* Collect results */ + rc = efx_mcdi_rpc_finish(efx, MC_CMD_PTP, + MC_CMD_PTP_IN_SYNCHRONIZE_LEN, + synch_buf, sizeof(synch_buf), + &response_length); + if (rc == 0) + rc = efx_ptp_process_times(efx, synch_buf, response_length, + &last_time); + + return rc; +} + +/* Get the host time from a given hardware time */ +static bool efx_ptp_get_host_time(struct efx_nic *efx, + struct skb_shared_hwtstamps *timestamps) +{ + if (efx->ptp_data->base_time_valid) { + ktime_t diff = ktime_sub(timestamps->hwtstamp, + efx->ptp_data->mc_base_time); + + timestamps->syststamp = ktime_add(efx->ptp_data->host_base_time, + diff); + } + + return efx->ptp_data->base_time_valid; +} + +/* Transmit a PTP packet, via the MCDI interface, to the wire. */ +static int efx_ptp_xmit_skb(struct efx_nic *efx, struct sk_buff *skb) +{ + u8 *txbuf = efx->ptp_data->txbuf; + struct skb_shared_hwtstamps timestamps; + int rc = -EIO; + /* MCDI driver requires word aligned lengths */ + size_t len = ALIGN(MC_CMD_PTP_IN_TRANSMIT_LEN(skb->len), 4); + u8 txtime[MC_CMD_PTP_OUT_TRANSMIT_LEN]; + + MCDI_SET_DWORD(txbuf, PTP_IN_OP, MC_CMD_PTP_OP_TRANSMIT); + MCDI_SET_DWORD(txbuf, PTP_IN_TRANSMIT_LENGTH, skb->len); + if (skb_shinfo(skb)->nr_frags != 0) { + rc = skb_linearize(skb); + if (rc != 0) + goto fail; + } + + if (skb->ip_summed == CHECKSUM_PARTIAL) { + rc = skb_checksum_help(skb); + if (rc != 0) + goto fail; + } + skb_copy_from_linear_data(skb, + &txbuf[MC_CMD_PTP_IN_TRANSMIT_PACKET_OFST], + len); + rc = efx_mcdi_rpc(efx, MC_CMD_PTP, txbuf, len, txtime, + sizeof(txtime), &len); + if (rc != 0) + goto fail; + + memset(×tamps, 0, sizeof(timestamps)); + timestamps.hwtstamp = ktime_set( + MCDI_DWORD(txtime, PTP_OUT_TRANSMIT_SECONDS), + MCDI_DWORD(txtime, PTP_OUT_TRANSMIT_NANOSECONDS)); + if (efx_ptp_get_host_time(efx, ×tamps)) + skb_tstamp_tx(skb, ×tamps); + /* Success even if hardware timestamping failed */ + rc = 0; + +fail: + dev_kfree_skb(skb); + + return rc; +} + +static void efx_ptp_drop_time_expired_events(struct efx_nic *efx) +{ + struct efx_ptp_data *ptp = efx->ptp_data; + struct list_head *cursor; + struct list_head *next; + + /* Drop time-expired events */ + spin_lock_bh(&ptp->evt_lock); + if (!list_empty(&ptp->evt_list)) { + list_for_each_safe(cursor, next, &ptp->evt_list) { + struct efx_ptp_event_rx *evt; + + evt = list_entry(cursor, struct efx_ptp_event_rx, + link); + if (time_after(jiffies, evt->expiry)) { + list_del(&evt->link); + list_add(&evt->link, &ptp->evt_free_list); + netif_warn(efx, hw, efx->net_dev, + "PTP rx event dropped\n"); + } + } + } + spin_unlock_bh(&ptp->evt_lock); +} + +static enum ptp_packet_state efx_ptp_match_rx(struct efx_nic *efx, + struct sk_buff *skb) +{ + struct efx_ptp_data *ptp = efx->ptp_data; + bool evts_waiting; + struct list_head *cursor; + struct list_head *next; + struct efx_ptp_match *match; + enum ptp_packet_state rc = PTP_PACKET_STATE_UNMATCHED; + + spin_lock_bh(&ptp->evt_lock); + evts_waiting = !list_empty(&ptp->evt_list); + spin_unlock_bh(&ptp->evt_lock); + + if (!evts_waiting) + return PTP_PACKET_STATE_UNMATCHED; + + match = (struct efx_ptp_match *)skb->cb; + /* Look for a matching timestamp in the event queue */ + spin_lock_bh(&ptp->evt_lock); + list_for_each_safe(cursor, next, &ptp->evt_list) { + struct efx_ptp_event_rx *evt; + + evt = list_entry(cursor, struct efx_ptp_event_rx, link); + if ((evt->seq0 == match->words[0]) && + (evt->seq1 == match->words[1])) { + struct skb_shared_hwtstamps *timestamps; + + /* Match - add in hardware timestamp */ + timestamps = skb_hwtstamps(skb); + timestamps->hwtstamp = evt->hwtimestamp; + + match->state = PTP_PACKET_STATE_MATCHED; + rc = PTP_PACKET_STATE_MATCHED; + list_del(&evt->link); + list_add(&evt->link, &ptp->evt_free_list); + break; + } + } + spin_unlock_bh(&ptp->evt_lock); + + return rc; +} + +/* Process any queued receive events and corresponding packets + * + * q is returned with all the packets that are ready for delivery. + * true is returned if at least one of those packets requires + * synchronisation. + */ +static bool efx_ptp_process_events(struct efx_nic *efx, struct sk_buff_head *q) +{ + struct efx_ptp_data *ptp = efx->ptp_data; + bool rc = false; + struct sk_buff *skb; + + while ((skb = skb_dequeue(&ptp->rxq))) { + struct efx_ptp_match *match; + + match = (struct efx_ptp_match *)skb->cb; + if (match->state == PTP_PACKET_STATE_MATCH_UNWANTED) { + __skb_queue_tail(q, skb); + } else if (efx_ptp_match_rx(efx, skb) == + PTP_PACKET_STATE_MATCHED) { + rc = true; + __skb_queue_tail(q, skb); + } else if (time_after(jiffies, match->expiry)) { + match->state = PTP_PACKET_STATE_TIMED_OUT; + netif_warn(efx, rx_err, efx->net_dev, + "PTP packet - no timestamp seen\n"); + __skb_queue_tail(q, skb); + } else { + /* Replace unprocessed entry and stop */ + skb_queue_head(&ptp->rxq, skb); + break; + } + } + + return rc; +} + +/* Complete processing of a received packet */ +static void efx_ptp_process_rx(struct efx_nic *efx, struct sk_buff *skb) +{ + struct efx_ptp_match *match = (struct efx_ptp_match *)skb->cb; + + /* Translate timestamps, as required */ + if (match->state == PTP_PACKET_STATE_MATCHED) { + struct skb_shared_hwtstamps *timestamps; + + timestamps = skb_hwtstamps(skb); + efx_ptp_get_host_time(efx, timestamps); + } + + local_bh_disable(); + netif_receive_skb(skb); + local_bh_enable(); +} + +static int efx_ptp_start(struct efx_nic *efx) +{ + struct efx_ptp_data *ptp = efx->ptp_data; + struct efx_filter_spec rxfilter; + int rc; + + ptp->reset_required = false; + + /* Must resynchronise when starting */ + ptp->base_time_valid = false; + ptp->base_sync_valid = false; + + /* Must filter on both event and general ports to ensure + * that there is no packet re-ordering. + */ + efx_filter_init_rx(&rxfilter, EFX_FILTER_PRI_REQUIRED, 0, + efx_rx_queue_index( + efx_channel_get_rx_queue(ptp->channel))); + rc = efx_filter_set_ipv4_local(&rxfilter, IPPROTO_UDP, + htonl(PTP_ADDRESS), + htons(PTP_EVENT_PORT)); + if (rc != 0) + return rc; + + rc = efx_filter_insert_filter(efx, &rxfilter, true); + if (rc < 0) + return rc; + ptp->rxfilter_event = rc; + + efx_filter_init_rx(&rxfilter, EFX_FILTER_PRI_REQUIRED, 0, + efx_rx_queue_index( + efx_channel_get_rx_queue(ptp->channel))); + rc = efx_filter_set_ipv4_local(&rxfilter, IPPROTO_UDP, + htonl(PTP_ADDRESS), + htons(PTP_GENERAL_PORT)); + if (rc != 0) + goto fail; + + rc = efx_filter_insert_filter(efx, &rxfilter, true); + if (rc < 0) + goto fail; + ptp->rxfilter_general = rc; + + rc = efx_ptp_enable(efx); + if (rc != 0) + goto fail2; + + ptp->evt_frag_idx = 0; + ptp->current_adjfreq = 0; + ptp->rxfilter_installed = true; + + return 0; + +fail2: + efx_filter_remove_id_safe(efx, EFX_FILTER_PRI_REQUIRED, + ptp->rxfilter_general); +fail: + efx_filter_remove_id_safe(efx, EFX_FILTER_PRI_REQUIRED, + ptp->rxfilter_event); + + return rc; +} + +static int efx_ptp_stop(struct efx_nic *efx) +{ + struct efx_ptp_data *ptp = efx->ptp_data; + int rc = efx_ptp_disable(efx); + struct list_head *cursor; + struct list_head *next; + + if (ptp->rxfilter_installed) { + efx_filter_remove_id_safe(efx, EFX_FILTER_PRI_REQUIRED, + ptp->rxfilter_general); + efx_filter_remove_id_safe(efx, EFX_FILTER_PRI_REQUIRED, + ptp->rxfilter_event); + ptp->rxfilter_installed = false; + } + + /* Make sure RX packets are really delivered */ + efx_ptp_deliver_rx_queue(&efx->ptp_data->rxq); + skb_queue_purge(&efx->ptp_data->txq); + + /* Drop any pending receive events */ + spin_lock_bh(&efx->ptp_data->evt_lock); + list_for_each_safe(cursor, next, &efx->ptp_data->evt_list) { + list_del(cursor); + list_add(cursor, &efx->ptp_data->evt_free_list); + } + spin_unlock_bh(&efx->ptp_data->evt_lock); + + return rc; +} + +static void efx_ptp_pps_worker(struct work_struct *work) +{ + struct efx_ptp_data *ptp = + container_of(work, struct efx_ptp_data, pps_work); + struct efx_nic *efx = ptp->channel->efx; + struct timespec event_gen_time; + struct ptp_clock_event ptp_pps_evt; + ktime_t gen_time_host; + + if (efx_ptp_synchronize(efx, PTP_SYNC_ATTEMPTS)) + return; + + gen_time_host = ktime_sub(ptp->mc_base_time, + ptp->host_base_time); + event_gen_time = ktime_to_timespec(gen_time_host); + + ptp_pps_evt.type = PTP_CLOCK_EXTTS; + ptp_pps_evt.timestamp = ktime_to_ns(gen_time_host); + ptp_clock_event(ptp->phc_clock, &ptp_pps_evt); +} + +/* Process any pending transmissions and timestamp any received packets. + * + * Host and NIC time are synchronised once if there is any work to do: + * the process is relatively expensive so don't do it for each packet. + */ +static void efx_ptp_worker(struct work_struct *work) +{ + struct efx_ptp_data *ptp_data = + container_of(work, struct efx_ptp_data, work); + struct efx_nic *efx = ptp_data->channel->efx; + struct sk_buff *skb; + struct sk_buff_head tempq; + + if (ptp_data->reset_required) { + efx_ptp_stop(efx); + efx_ptp_start(efx); + return; + } + + efx_ptp_drop_time_expired_events(efx); + + __skb_queue_head_init(&tempq); + if (efx_ptp_process_events(efx, &tempq) || + !skb_queue_empty(&ptp_data->txq)) { + /* Synchronise PC/MC times when there's work to do. This + * isn't fatal but would be unusual (because of the retries + * within efx_ptp_synchronize). Failure may suggest a heavily + * overloaded system. + */ + if (0 != efx_ptp_synchronize(efx, PTP_SYNC_ATTEMPTS)) + netif_warn(efx, drv, efx->net_dev, + "PTP couldn't get synchronisation\n"); + + while ((skb = skb_dequeue(&ptp_data->txq))) + efx_ptp_xmit_skb(efx, skb); + } + + while ((skb = __skb_dequeue(&tempq))) + efx_ptp_process_rx(efx, skb); +} + +/* Initialise PTP channel and state. + * + * Setting core_index to zero causes the queue to be initialised and doesn't + * overlap with 'rxq0' because ptp.c doesn't use skb_record_rx_queue. + */ +static int efx_ptp_probe_channel(struct efx_channel *channel) +{ + struct efx_nic *efx = channel->efx; + struct efx_ptp_data *ptp; + int rc = 0; + unsigned int pos; + + channel->irq_moderation = 0; + channel->rx_queue.core_index = 0; + + ptp = kzalloc(sizeof(struct efx_ptp_data), GFP_KERNEL); + efx->ptp_data = ptp; + if (!efx->ptp_data) + return -ENOMEM; + + rc = efx_nic_alloc_buffer(efx, &ptp->start, sizeof(int)); + if (rc != 0) + goto fail1; + + ptp->channel = channel; + skb_queue_head_init(&ptp->rxq); + skb_queue_head_init(&ptp->txq); + ptp->workwq = create_singlethread_workqueue("sfc_ptp"); + if (!ptp->workwq) { + rc = -ENOMEM; + goto fail2; + } + + INIT_WORK(&ptp->work, efx_ptp_worker); + ptp->config.flags = 0; + ptp->config.tx_type = HWTSTAMP_TX_OFF; + ptp->config.rx_filter = HWTSTAMP_FILTER_NONE; + INIT_LIST_HEAD(&ptp->evt_list); + INIT_LIST_HEAD(&ptp->evt_free_list); + spin_lock_init(&ptp->evt_lock); + for (pos = 0; pos < MAX_RECEIVE_EVENTS; pos++) + list_add(&ptp->rx_evts[pos].link, &ptp->evt_free_list); + + ptp->phc_clock_info.owner = THIS_MODULE; + snprintf(ptp->phc_clock_info.name, + sizeof(ptp->phc_clock_info.name), + "%pm", efx->net_dev->perm_addr); + ptp->phc_clock_info.max_adj = MAX_PPB; + ptp->phc_clock_info.n_alarm = 0; + ptp->phc_clock_info.n_ext_ts = 1; + ptp->phc_clock_info.n_per_out = 0; + ptp->phc_clock_info.pps = 0; + ptp->phc_clock_info.adjfreq = efx_phc_adjfreq; + ptp->phc_clock_info.adjtime = efx_phc_adjtime; + ptp->phc_clock_info.gettime = efx_phc_gettime; + ptp->phc_clock_info.settime = efx_phc_settime; + ptp->phc_clock_info.enable = efx_phc_enable; + + ptp->phc_clock = ptp_clock_register(&ptp->phc_clock_info); + if (!ptp->phc_clock) + goto fail3; + + INIT_WORK(&ptp->pps_work, efx_ptp_pps_worker); + ptp->pps_workwq = create_singlethread_workqueue("sfc_pps"); + if (!ptp->pps_workwq) { + rc = -ENOMEM; + goto fail4; + } + ptp->nic_ts_enabled = false; + + return 0; +fail4: + ptp_clock_unregister(efx->ptp_data->phc_clock); + +fail3: + destroy_workqueue(efx->ptp_data->workwq); + +fail2: + efx_nic_free_buffer(efx, &ptp->start); + +fail1: + kfree(efx->ptp_data); + efx->ptp_data = 0; + + return rc; +} + +static void efx_ptp_remove_channel(struct efx_channel *channel) +{ + struct efx_nic *efx = channel->efx; + + if (!efx->ptp_data) + return; + + (void)efx_ptp_disable(channel->efx); + + cancel_work_sync(&efx->ptp_data->work); + cancel_work_sync(&efx->ptp_data->pps_work); + + skb_queue_purge(&efx->ptp_data->rxq); + skb_queue_purge(&efx->ptp_data->txq); + + ptp_clock_unregister(efx->ptp_data->phc_clock); + + destroy_workqueue(efx->ptp_data->workwq); + destroy_workqueue(efx->ptp_data->pps_workwq); + + efx_nic_free_buffer(efx, &efx->ptp_data->start); + kfree(efx->ptp_data); +} + +static void efx_ptp_get_channel_name(struct efx_channel *channel, + char *buf, size_t len) +{ + snprintf(buf, len, "%s-ptp", channel->efx->name); +} + +/* Determine whether this packet should be processed by the PTP module + * or transmitted conventionally. + */ +bool efx_ptp_is_ptp_tx(struct efx_nic *efx, struct sk_buff *skb) +{ + return efx->ptp_data && + efx->ptp_data->enabled && + skb->len >= PTP_MIN_LENGTH && + skb->len <= MC_CMD_PTP_IN_TRANSMIT_PACKET_MAXNUM && + likely(skb->protocol == htons(ETH_P_IP)) && + ip_hdr(skb)->protocol == IPPROTO_UDP && + udp_hdr(skb)->dest == htons(PTP_EVENT_PORT); +} + +/* Receive a PTP packet. Packets are queued until the arrival of + * the receive timestamp from the MC - this will probably occur after the + * packet arrival because of the processing in the MC. + */ +static void efx_ptp_rx(struct efx_channel *channel, struct sk_buff *skb) +{ + struct efx_nic *efx = channel->efx; + struct efx_ptp_data *ptp = efx->ptp_data; + struct efx_ptp_match *match = (struct efx_ptp_match *)skb->cb; + u8 *data; + unsigned int version; + + match->expiry = jiffies + msecs_to_jiffies(PKT_EVENT_LIFETIME_MS); + + /* Correct version? */ + if (ptp->mode == MC_CMD_PTP_MODE_V1) { + if (skb->len < PTP_V1_MIN_LENGTH) { + netif_receive_skb(skb); + return; + } + version = ntohs(*(__be16 *)&skb->data[PTP_V1_VERSION_OFFSET]); + if (version != PTP_VERSION_V1) { + netif_receive_skb(skb); + return; + } + } else { + if (skb->len < PTP_V2_MIN_LENGTH) { + netif_receive_skb(skb); + return; + } + version = skb->data[PTP_V2_VERSION_OFFSET]; + + BUG_ON(ptp->mode != MC_CMD_PTP_MODE_V2); + BUILD_BUG_ON(PTP_V1_UUID_OFFSET != PTP_V2_MC_UUID_OFFSET); + BUILD_BUG_ON(PTP_V1_UUID_LENGTH != PTP_V2_MC_UUID_LENGTH); + BUILD_BUG_ON(PTP_V1_SEQUENCE_OFFSET != PTP_V2_SEQUENCE_OFFSET); + BUILD_BUG_ON(PTP_V1_SEQUENCE_LENGTH != PTP_V2_SEQUENCE_LENGTH); + + if ((version & PTP_VERSION_V2_MASK) != PTP_VERSION_V2) { + netif_receive_skb(skb); + return; + } + } + + /* Does this packet require timestamping? */ + if (ntohs(*(__be16 *)&skb->data[PTP_DPORT_OFFSET]) == PTP_EVENT_PORT) { + struct skb_shared_hwtstamps *timestamps; + + match->state = PTP_PACKET_STATE_UNMATCHED; + + /* Clear all timestamps held: filled in later */ + timestamps = skb_hwtstamps(skb); + memset(timestamps, 0, sizeof(*timestamps)); + + /* Extract UUID/Sequence information */ + data = skb->data + PTP_V1_UUID_OFFSET; + match->words[0] = (data[0] | + (data[1] << 8) | + (data[2] << 16) | + (data[3] << 24)); + match->words[1] = (data[4] | + (data[5] << 8) | + (skb->data[PTP_V1_SEQUENCE_OFFSET + + PTP_V1_SEQUENCE_LENGTH - 1] << + 16)); + } else { + match->state = PTP_PACKET_STATE_MATCH_UNWANTED; + } + + skb_queue_tail(&ptp->rxq, skb); + queue_work(ptp->workwq, &ptp->work); +} + +/* Transmit a PTP packet. This has to be transmitted by the MC + * itself, through an MCDI call. MCDI calls aren't permitted + * in the transmit path so defer the actual transmission to a suitable worker. + */ +int efx_ptp_tx(struct efx_nic *efx, struct sk_buff *skb) +{ + struct efx_ptp_data *ptp = efx->ptp_data; + + skb_queue_tail(&ptp->txq, skb); + + if ((udp_hdr(skb)->dest == htons(PTP_EVENT_PORT)) && + (skb->len <= MC_CMD_PTP_IN_TRANSMIT_PACKET_MAXNUM)) + efx_xmit_hwtstamp_pending(skb); + queue_work(ptp->workwq, &ptp->work); + + return NETDEV_TX_OK; +} + +static int efx_ptp_change_mode(struct efx_nic *efx, bool enable_wanted, + unsigned int new_mode) +{ + if ((enable_wanted != efx->ptp_data->enabled) || + (enable_wanted && (efx->ptp_data->mode != new_mode))) { + int rc; + + if (enable_wanted) { + /* Change of mode requires disable */ + if (efx->ptp_data->enabled && + (efx->ptp_data->mode != new_mode)) { + efx->ptp_data->enabled = false; + rc = efx_ptp_stop(efx); + if (rc != 0) + return rc; + } + + /* Set new operating mode and establish + * baseline synchronisation, which must + * succeed. + */ + efx->ptp_data->mode = new_mode; + rc = efx_ptp_start(efx); + if (rc == 0) { + rc = efx_ptp_synchronize(efx, + PTP_SYNC_ATTEMPTS * 2); + if (rc != 0) + efx_ptp_stop(efx); + } + } else { + rc = efx_ptp_stop(efx); + } + + if (rc != 0) + return rc; + + efx->ptp_data->enabled = enable_wanted; + } + + return 0; +} + +static int efx_ptp_ts_init(struct efx_nic *efx, struct hwtstamp_config *init) +{ + bool enable_wanted = false; + unsigned int new_mode; + int rc; + + if (init->flags) + return -EINVAL; + + if ((init->tx_type != HWTSTAMP_TX_OFF) && + (init->tx_type != HWTSTAMP_TX_ON)) + return -ERANGE; + + new_mode = efx->ptp_data->mode; + /* Determine whether any PTP HW operations are required */ + switch (init->rx_filter) { + case HWTSTAMP_FILTER_NONE: + break; + case HWTSTAMP_FILTER_PTP_V1_L4_EVENT: + case HWTSTAMP_FILTER_PTP_V1_L4_SYNC: + case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ: + init->rx_filter = HWTSTAMP_FILTER_PTP_V1_L4_EVENT; + new_mode = MC_CMD_PTP_MODE_V1; + enable_wanted = true; + break; + case HWTSTAMP_FILTER_PTP_V2_L4_EVENT: + case HWTSTAMP_FILTER_PTP_V2_L4_SYNC: + case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ: + /* Although these three are accepted only IPV4 packets will be + * timestamped + */ + case HWTSTAMP_FILTER_PTP_V2_EVENT: + case HWTSTAMP_FILTER_PTP_V2_SYNC: + case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ: + init->rx_filter = HWTSTAMP_FILTER_PTP_V2_L4_EVENT; + new_mode = MC_CMD_PTP_MODE_V2; + enable_wanted = true; + break; + case HWTSTAMP_FILTER_PTP_V2_L2_EVENT: + case HWTSTAMP_FILTER_PTP_V2_L2_SYNC: + case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ: + /* Non-IP timestamping not supported */ + return -ERANGE; + break; + default: + return -ERANGE; + } + + if (init->tx_type != HWTSTAMP_TX_OFF) + enable_wanted = true; + + rc = efx_ptp_change_mode(efx, enable_wanted, new_mode); + if (rc != 0) + return rc; + + efx->ptp_data->config = *init; + + return 0; +} + +int +efx_ptp_get_ts_info(struct net_device *net_dev, struct ethtool_ts_info *ts_info) +{ + struct efx_nic *efx = netdev_priv(net_dev); + struct efx_ptp_data *ptp = efx->ptp_data; + + if (!ptp) + return -EOPNOTSUPP; + + ts_info->so_timestamping = (SOF_TIMESTAMPING_TX_HARDWARE | + SOF_TIMESTAMPING_RX_HARDWARE | + SOF_TIMESTAMPING_SYS_HARDWARE | + SOF_TIMESTAMPING_RAW_HARDWARE); + ts_info->phc_index = ptp_clock_index(ptp->phc_clock); + ts_info->tx_types = 1 << HWTSTAMP_TX_OFF | 1 << HWTSTAMP_TX_ON; + ts_info->rx_filters = (1 << HWTSTAMP_FILTER_NONE | + 1 << HWTSTAMP_FILTER_PTP_V1_L4_EVENT | + 1 << HWTSTAMP_FILTER_PTP_V1_L4_SYNC | + 1 << HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ | + 1 << HWTSTAMP_FILTER_PTP_V2_L4_EVENT | + 1 << HWTSTAMP_FILTER_PTP_V2_L4_SYNC | + 1 << HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ | + 1 << HWTSTAMP_FILTER_PTP_V2_EVENT | + 1 << HWTSTAMP_FILTER_PTP_V2_SYNC | + 1 << HWTSTAMP_FILTER_PTP_V2_DELAY_REQ); + return 0; +} + +int efx_ptp_ioctl(struct efx_nic *efx, struct ifreq *ifr, int cmd) +{ + struct hwtstamp_config config; + int rc; + + /* Not a PTP enabled port */ + if (!efx->ptp_data) + return -EOPNOTSUPP; + + if (copy_from_user(&config, ifr->ifr_data, sizeof(config))) + return -EFAULT; + + rc = efx_ptp_ts_init(efx, &config); + if (rc != 0) + return rc; + + return copy_to_user(ifr->ifr_data, &config, sizeof(config)) + ? -EFAULT : 0; +} + +static void ptp_event_failure(struct efx_nic *efx, int expected_frag_len) +{ + struct efx_ptp_data *ptp = efx->ptp_data; + + netif_err(efx, hw, efx->net_dev, + "PTP unexpected event length: got %d expected %d\n", + ptp->evt_frag_idx, expected_frag_len); + ptp->reset_required = true; + queue_work(ptp->workwq, &ptp->work); +} + +/* Process a completed receive event. Put it on the event queue and + * start worker thread. This is required because event and their + * correspoding packets may come in either order. + */ +static void ptp_event_rx(struct efx_nic *efx, struct efx_ptp_data *ptp) +{ + struct efx_ptp_event_rx *evt = NULL; + + if (ptp->evt_frag_idx != 3) { + ptp_event_failure(efx, 3); + return; + } + + spin_lock_bh(&ptp->evt_lock); + if (!list_empty(&ptp->evt_free_list)) { + evt = list_first_entry(&ptp->evt_free_list, + struct efx_ptp_event_rx, link); + list_del(&evt->link); + + evt->seq0 = EFX_QWORD_FIELD(ptp->evt_frags[2], MCDI_EVENT_DATA); + evt->seq1 = (EFX_QWORD_FIELD(ptp->evt_frags[2], + MCDI_EVENT_SRC) | + (EFX_QWORD_FIELD(ptp->evt_frags[1], + MCDI_EVENT_SRC) << 8) | + (EFX_QWORD_FIELD(ptp->evt_frags[0], + MCDI_EVENT_SRC) << 16)); + evt->hwtimestamp = ktime_set( + EFX_QWORD_FIELD(ptp->evt_frags[0], MCDI_EVENT_DATA), + EFX_QWORD_FIELD(ptp->evt_frags[1], MCDI_EVENT_DATA)); + evt->expiry = jiffies + msecs_to_jiffies(PKT_EVENT_LIFETIME_MS); + list_add_tail(&evt->link, &ptp->evt_list); + + queue_work(ptp->workwq, &ptp->work); + } else { + netif_err(efx, rx_err, efx->net_dev, "No free PTP event"); + } + spin_unlock_bh(&ptp->evt_lock); +} + +static void ptp_event_fault(struct efx_nic *efx, struct efx_ptp_data *ptp) +{ + int code = EFX_QWORD_FIELD(ptp->evt_frags[0], MCDI_EVENT_DATA); + if (ptp->evt_frag_idx != 1) { + ptp_event_failure(efx, 1); + return; + } + + netif_err(efx, hw, efx->net_dev, "PTP error %d\n", code); +} + +static void ptp_event_pps(struct efx_nic *efx, struct efx_ptp_data *ptp) +{ + if (ptp->nic_ts_enabled) + queue_work(ptp->pps_workwq, &ptp->pps_work); +} + +void efx_ptp_event(struct efx_nic *efx, efx_qword_t *ev) +{ + struct efx_ptp_data *ptp = efx->ptp_data; + int code = EFX_QWORD_FIELD(*ev, MCDI_EVENT_CODE); + + if (!ptp->enabled) + return; + + if (ptp->evt_frag_idx == 0) { + ptp->evt_code = code; + } else if (ptp->evt_code != code) { + netif_err(efx, hw, efx->net_dev, + "PTP out of sequence event %d\n", code); + ptp->evt_frag_idx = 0; + } + + ptp->evt_frags[ptp->evt_frag_idx++] = *ev; + if (!MCDI_EVENT_FIELD(*ev, CONT)) { + /* Process resulting event */ + switch (code) { + case MCDI_EVENT_CODE_PTP_RX: + ptp_event_rx(efx, ptp); + break; + case MCDI_EVENT_CODE_PTP_FAULT: + ptp_event_fault(efx, ptp); + break; + case MCDI_EVENT_CODE_PTP_PPS: + ptp_event_pps(efx, ptp); + break; + default: + netif_err(efx, hw, efx->net_dev, + "PTP unknown event %d\n", code); + break; + } + ptp->evt_frag_idx = 0; + } else if (MAX_EVENT_FRAGS == ptp->evt_frag_idx) { + netif_err(efx, hw, efx->net_dev, + "PTP too many event fragments\n"); + ptp->evt_frag_idx = 0; + } +} + +static int efx_phc_adjfreq(struct ptp_clock_info *ptp, s32 delta) +{ + struct efx_ptp_data *ptp_data = container_of(ptp, + struct efx_ptp_data, + phc_clock_info); + struct efx_nic *efx = ptp_data->channel->efx; + u8 inadj[MC_CMD_PTP_IN_ADJUST_LEN]; + s64 adjustment_ns; + int rc; + + if (delta > MAX_PPB) + delta = MAX_PPB; + else if (delta < -MAX_PPB) + delta = -MAX_PPB; + + /* Convert ppb to fixed point ns. */ + adjustment_ns = (((s64)delta * PPB_SCALE_WORD) >> + (PPB_EXTRA_BITS + MAX_PPB_BITS)); + + MCDI_SET_DWORD(inadj, PTP_IN_OP, MC_CMD_PTP_OP_ADJUST); + MCDI_SET_DWORD(inadj, PTP_IN_ADJUST_FREQ_LO, (u32)adjustment_ns); + MCDI_SET_DWORD(inadj, PTP_IN_ADJUST_FREQ_HI, + (u32)(adjustment_ns >> 32)); + MCDI_SET_DWORD(inadj, PTP_IN_ADJUST_SECONDS, 0); + MCDI_SET_DWORD(inadj, PTP_IN_ADJUST_NANOSECONDS, 0); + rc = efx_mcdi_rpc(efx, MC_CMD_PTP, inadj, sizeof(inadj), + NULL, 0, NULL); + if (rc != 0) + return rc; + + ptp_data->current_adjfreq = delta; + return 0; +} + +static int efx_phc_adjtime(struct ptp_clock_info *ptp, s64 delta) +{ + struct efx_ptp_data *ptp_data = container_of(ptp, + struct efx_ptp_data, + phc_clock_info); + struct efx_nic *efx = ptp_data->channel->efx; + struct timespec delta_ts = ns_to_timespec(delta); + u8 inbuf[MC_CMD_PTP_IN_ADJUST_LEN]; + + MCDI_SET_DWORD(inbuf, PTP_IN_OP, MC_CMD_PTP_OP_ADJUST); + MCDI_SET_DWORD(inbuf, PTP_IN_ADJUST_FREQ_LO, 0); + MCDI_SET_DWORD(inbuf, PTP_IN_ADJUST_FREQ_HI, 0); + MCDI_SET_DWORD(inbuf, PTP_IN_ADJUST_SECONDS, (u32)delta_ts.tv_sec); + MCDI_SET_DWORD(inbuf, PTP_IN_ADJUST_NANOSECONDS, (u32)delta_ts.tv_nsec); + return efx_mcdi_rpc(efx, MC_CMD_PTP, inbuf, sizeof(inbuf), + NULL, 0, NULL); +} + +static int efx_phc_gettime(struct ptp_clock_info *ptp, struct timespec *ts) +{ + struct efx_ptp_data *ptp_data = container_of(ptp, + struct efx_ptp_data, + phc_clock_info); + struct efx_nic *efx = ptp_data->channel->efx; + u8 inbuf[MC_CMD_PTP_IN_READ_NIC_TIME_LEN]; + u8 outbuf[MC_CMD_PTP_OUT_READ_NIC_TIME_LEN]; + int rc; + + MCDI_SET_DWORD(inbuf, PTP_IN_OP, MC_CMD_PTP_OP_READ_NIC_TIME); + + rc = efx_mcdi_rpc(efx, MC_CMD_PTP, inbuf, sizeof(inbuf), + outbuf, sizeof(outbuf), NULL); + if (rc != 0) + return rc; + + ts->tv_sec = MCDI_DWORD(outbuf, PTP_OUT_READ_NIC_TIME_SECONDS); + ts->tv_nsec = MCDI_DWORD(outbuf, PTP_OUT_READ_NIC_TIME_NANOSECONDS); + return 0; +} + +static int efx_phc_settime(struct ptp_clock_info *ptp, + const struct timespec *e_ts) +{ + /* We must provide this function, but we cannot actually set the time */ + return -EOPNOTSUPP; +} + +static int efx_phc_enable(struct ptp_clock_info *ptp, + struct ptp_clock_request *request, + int enable) +{ + struct efx_ptp_data *ptp_data = container_of(ptp, + struct efx_ptp_data, + phc_clock_info); + if (request->type != PTP_CLK_REQ_EXTTS) + return -EOPNOTSUPP; + + ptp_data->nic_ts_enabled = !!enable; + return 0; +} + +static const struct efx_channel_type efx_ptp_channel_type = { + .handle_no_channel = efx_ptp_handle_no_channel, + .pre_probe = efx_ptp_probe_channel, + .post_remove = efx_ptp_remove_channel, + .get_name = efx_ptp_get_channel_name, + /* no copy operation; there is no need to reallocate this channel */ + .receive_skb = efx_ptp_rx, + .keep_eventq = false, +}; + +void efx_ptp_probe(struct efx_nic *efx) +{ + /* Check whether PTP is implemented on this NIC. The DISABLE + * operation will succeed if and only if it is implemented. + */ + if (efx_ptp_disable(efx) == 0) + efx->extra_channel_type[EFX_EXTRA_CHANNEL_PTP] = + &efx_ptp_channel_type; +} diff --git a/drivers/net/ethernet/sfc/rx.c b/drivers/net/ethernet/sfc/rx.c index 92699a0..8923863 100644 --- a/drivers/net/ethernet/sfc/rx.c +++ b/drivers/net/ethernet/sfc/rx.c @@ -573,7 +573,7 @@ static void efx_rx_deliver(struct efx_channel *channel, /* Record the rx_queue */ skb_record_rx_queue(skb, channel->rx_queue.core_index); - /* Does the channel want to handle the skb */ + /* Pass the packet up */ if (channel->type->receive_skb) channel->type->receive_skb(channel, skb); else diff --git a/drivers/net/ethernet/sfc/siena.c b/drivers/net/ethernet/sfc/siena.c index 6bafd21..84b41bf 100644 --- a/drivers/net/ethernet/sfc/siena.c +++ b/drivers/net/ethernet/sfc/siena.c @@ -335,6 +335,7 @@ static int siena_probe_nic(struct efx_nic *efx) goto fail5; efx_sriov_probe(efx); + efx_ptp_probe(efx); return 0; diff --git a/drivers/net/ethernet/sfc/tx.c b/drivers/net/ethernet/sfc/tx.c index 9b225a7..66badf8 100644 --- a/drivers/net/ethernet/sfc/tx.c +++ b/drivers/net/ethernet/sfc/tx.c @@ -347,6 +347,12 @@ netdev_tx_t efx_hard_start_xmit(struct sk_buff *skb, EFX_WARN_ON_PARANOID(!netif_device_present(net_dev)); + /* PTP "event" packet */ + if (unlikely(efx_xmit_with_hwtstamp(skb)) && + unlikely(efx_ptp_is_ptp_tx(efx, skb))) { + return efx_ptp_tx(efx, skb); + } + index = skb_get_queue_mapping(skb); type = skb->ip_summed == CHECKSUM_PARTIAL ? EFX_TXQ_TYPE_OFFLOAD : 0; if (index >= efx->n_tx_channels) { -- 1.7.7.6 -- Ben Hutchings, Staff Engineer, Solarflare Not speaking for my employer; that's the marketing department's job. They asked us to note that Solarflare product names are trademarked. ^ permalink raw reply related [flat|nested] 23+ messages in thread
* Re: [PATCH net-next 4/7] sfc: Add support for IEEE-1588 PTP 2012-07-18 18:21 ` [PATCH net-next 4/7] sfc: Add support for IEEE-1588 PTP Ben Hutchings @ 2012-07-19 14:25 ` Richard Cochran 2012-07-19 14:37 ` Ben Hutchings 2012-07-19 15:29 ` Stuart Hodgson 0 siblings, 2 replies; 23+ messages in thread From: Richard Cochran @ 2012-07-19 14:25 UTC (permalink / raw) To: Ben Hutchings; +Cc: David Miller, netdev, linux-net-drivers, Andrew Jackson On Wed, Jul 18, 2012 at 07:21:33PM +0100, Ben Hutchings wrote: > Add PTP IEEE-1588 support and make accesible via the PHC subsystem. > > This work is based on prior code by Andrew Jackson > > Signed-off-by: Stuart Hodgson <smhodgson@solarflare.com> > Signed-off-by: Ben Hutchings <bhutchings@solarflare.com> > --- > drivers/net/ethernet/sfc/Kconfig | 7 + > drivers/net/ethernet/sfc/Makefile | 1 + > drivers/net/ethernet/sfc/efx.c | 3 + > drivers/net/ethernet/sfc/ethtool.c | 1 + > drivers/net/ethernet/sfc/mcdi_pcol.h | 1 + > drivers/net/ethernet/sfc/net_driver.h | 19 +- > drivers/net/ethernet/sfc/nic.h | 31 + > drivers/net/ethernet/sfc/ptp.c | 1519 +++++++++++++++++++++++++++++++++ > drivers/net/ethernet/sfc/rx.c | 2 +- > drivers/net/ethernet/sfc/siena.c | 1 + > drivers/net/ethernet/sfc/tx.c | 6 + > 11 files changed, 1589 insertions(+), 2 deletions(-) > create mode 100644 drivers/net/ethernet/sfc/ptp.c > > diff --git a/drivers/net/ethernet/sfc/Kconfig b/drivers/net/ethernet/sfc/Kconfig > index fb3cbc2..78c5d435 100644 > --- a/drivers/net/ethernet/sfc/Kconfig > +++ b/drivers/net/ethernet/sfc/Kconfig > @@ -34,3 +34,10 @@ config SFC_SRIOV > This enables support for the SFC9000 I/O Virtualization > features, allowing accelerated network performance in > virtualized environments. > +config SFC_PTP > + bool "Solarflare SFC9000-family PTP support" > + depends on SFC && PTP_1588_CLOCK > + default y > + ---help--- > + This enables support for the Precision Time Protocol (PTP) > + on SFC9000-family NICs > diff --git a/drivers/net/ethernet/sfc/Makefile b/drivers/net/ethernet/sfc/Makefile > index ea1f8db..e11f2ec 100644 > --- a/drivers/net/ethernet/sfc/Makefile > +++ b/drivers/net/ethernet/sfc/Makefile > @@ -5,5 +5,6 @@ sfc-y += efx.o nic.o falcon.o siena.o tx.o rx.o filter.o \ > mcdi.o mcdi_phy.o mcdi_mon.o > sfc-$(CONFIG_SFC_MTD) += mtd.o > sfc-$(CONFIG_SFC_SRIOV) += siena_sriov.o > +sfc-$(CONFIG_SFC_PTP) += ptp.o > > obj-$(CONFIG_SFC) += sfc.o > diff --git a/drivers/net/ethernet/sfc/efx.c b/drivers/net/ethernet/sfc/efx.c > index 1c53d4b..e6631f0e 100644 > --- a/drivers/net/ethernet/sfc/efx.c > +++ b/drivers/net/ethernet/sfc/efx.c > @@ -1748,6 +1748,9 @@ static int efx_ioctl(struct net_device *net_dev, struct ifreq *ifr, int cmd) > > EFX_ASSERT_RESET_SERIALISED(efx); > > + if (cmd == SIOCSHWTSTAMP) > + return efx_ptp_ioctl(efx, ifr, cmd); > + > /* Convert phy_id from older PRTAD/DEVAD format */ > if ((cmd == SIOCGMIIREG || cmd == SIOCSMIIREG) && > (data->phy_id & 0xfc00) == 0x0400) > diff --git a/drivers/net/ethernet/sfc/ethtool.c b/drivers/net/ethernet/sfc/ethtool.c > index 10536f9..50cdd39 100644 > --- a/drivers/net/ethernet/sfc/ethtool.c > +++ b/drivers/net/ethernet/sfc/ethtool.c > @@ -1170,6 +1170,7 @@ const struct ethtool_ops efx_ethtool_ops = { > .get_rxfh_indir_size = efx_ethtool_get_rxfh_indir_size, > .get_rxfh_indir = efx_ethtool_get_rxfh_indir, > .set_rxfh_indir = efx_ethtool_set_rxfh_indir, > + .get_ts_info = efx_ptp_get_ts_info, > .get_module_info = efx_ethtool_get_module_info, > .get_module_eeprom = efx_ethtool_get_module_eeprom, > }; > diff --git a/drivers/net/ethernet/sfc/mcdi_pcol.h b/drivers/net/ethernet/sfc/mcdi_pcol.h > index 0310b9f0..0017f98 100644 > --- a/drivers/net/ethernet/sfc/mcdi_pcol.h > +++ b/drivers/net/ethernet/sfc/mcdi_pcol.h > @@ -290,6 +290,7 @@ > #define MCDI_EVENT_CODE_TX_FLUSH 0xc /* enum */ > #define MCDI_EVENT_CODE_PTP_RX 0xd /* enum */ > #define MCDI_EVENT_CODE_PTP_FAULT 0xe /* enum */ > +#define MCDI_EVENT_CODE_PTP_PPS 0xf /* enum */ > #define MCDI_EVENT_CMDDONE_DATA_OFST 0 > #define MCDI_EVENT_CMDDONE_DATA_LBN 0 > #define MCDI_EVENT_CMDDONE_DATA_WIDTH 32 > diff --git a/drivers/net/ethernet/sfc/net_driver.h b/drivers/net/ethernet/sfc/net_driver.h > index 9913e32..f84a5d5 100644 > --- a/drivers/net/ethernet/sfc/net_driver.h > +++ b/drivers/net/ethernet/sfc/net_driver.h > @@ -56,7 +56,8 @@ > #define EFX_MAX_CHANNELS 32U > #define EFX_MAX_RX_QUEUES EFX_MAX_CHANNELS > #define EFX_EXTRA_CHANNEL_IOV 0 > -#define EFX_MAX_EXTRA_CHANNELS 1U > +#define EFX_EXTRA_CHANNEL_PTP 1 > +#define EFX_MAX_EXTRA_CHANNELS 2U > > /* Checksum generation is a per-queue option in hardware, so each > * queue visible to the networking core is backed by two hardware TX > @@ -68,6 +69,9 @@ > #define EFX_TXQ_TYPES 4 > #define EFX_MAX_TX_QUEUES (EFX_TXQ_TYPES * EFX_MAX_CHANNELS) > > +/* Forward declare Precision Time Protocol (PTP) support structure. */ > +struct efx_ptp_data; > + > struct efx_self_tests; > > /** > @@ -736,6 +740,7 @@ struct vfdi_status; > * %local_addr_list. Protected by %local_lock. > * @local_lock: Mutex protecting %local_addr_list and %local_page_list. > * @peer_work: Work item to broadcast peer addresses to VMs. > + * @ptp_data: PTP state data > * @monitor_work: Hardware monitor workitem > * @biu_lock: BIU (bus interface unit) lock > * @last_irq_cpu: Last CPU to handle a possible test interrupt. This > @@ -860,6 +865,10 @@ struct efx_nic { > struct work_struct peer_work; > #endif > > +#ifdef CONFIG_SFC_PTP > + struct efx_ptp_data *ptp_data; > +#endif > + > /* The following fields may be written more often */ > > struct delayed_work monitor_work ____cacheline_aligned_in_smp; > @@ -1122,5 +1131,13 @@ static inline void clear_bit_le(unsigned nr, unsigned char *addr) > #define EFX_MAX_FRAME_LEN(mtu) \ > ((((mtu) + ETH_HLEN + VLAN_HLEN + 4/* FCS */ + 7) & ~7) + 16) > > +static inline bool efx_xmit_with_hwtstamp(struct sk_buff *skb) > +{ > + return skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP; > +} > +static inline void efx_xmit_hwtstamp_pending(struct sk_buff *skb) > +{ > + skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS; > +} > > #endif /* EFX_NET_DRIVER_H */ > diff --git a/drivers/net/ethernet/sfc/nic.h b/drivers/net/ethernet/sfc/nic.h > index bab5cd9..cd53ab5 100644 > --- a/drivers/net/ethernet/sfc/nic.h > +++ b/drivers/net/ethernet/sfc/nic.h > @@ -250,6 +250,37 @@ extern int efx_sriov_get_vf_config(struct net_device *dev, int vf, > extern int efx_sriov_set_vf_spoofchk(struct net_device *net_dev, int vf, > bool spoofchk); > > +struct ethtool_ts_info; > +#ifdef CONFIG_SFC_PTP > +extern void efx_ptp_probe(struct efx_nic *efx); > +extern int efx_ptp_ioctl(struct efx_nic *efx, struct ifreq *ifr, int cmd); > +extern int efx_ptp_get_ts_info(struct net_device *net_dev, > + struct ethtool_ts_info *ts_info); > +extern bool efx_ptp_is_ptp_tx(struct efx_nic *efx, struct sk_buff *skb); > +extern int efx_ptp_tx(struct efx_nic *efx, struct sk_buff *skb); > +extern void efx_ptp_event(struct efx_nic *efx, efx_qword_t *ev); > +#else > +static inline void efx_ptp_probe(struct efx_nic *efx) {} > +static inline int efx_ptp_ioctl(struct efx_nic *efx, struct ifreq *ifr, int cmd) > +{ > + return -EOPNOTSUPP; > +} > +static inline int efx_ptp_get_ts_info(struct net_device *net_dev, > + struct ethtool_ts_info *ts_info) > +{ > + return -EOPNOTSUPP; If your PTP support is not enabled, then it would be better to offer the standard ethtool answer to this query. Also, it would be nice to still offer SW Tx timestamping, even when PTP is disabled. > +} > +static inline bool efx_ptp_is_ptp_tx(struct efx_nic *efx, struct sk_buff *skb) > +{ > + return false; > +} > +static inline int efx_ptp_tx(struct efx_nic *efx, struct sk_buff *skb) > +{ > + return NETDEV_TX_OK; > +} > +static inline void efx_ptp_event(struct efx_nic *efx, efx_qword_t *ev) {} > +#endif > + > extern const struct efx_nic_type falcon_a1_nic_type; > extern const struct efx_nic_type falcon_b0_nic_type; > extern const struct efx_nic_type siena_a0_nic_type; > diff --git a/drivers/net/ethernet/sfc/ptp.c b/drivers/net/ethernet/sfc/ptp.c > new file mode 100644 > index 0000000..ba1e76a > --- /dev/null > +++ b/drivers/net/ethernet/sfc/ptp.c > @@ -0,0 +1,1519 @@ > +/**************************************************************************** > + * Driver for Solarflare Solarstorm network controllers and boards > + * Copyright 2011 Solarflare Communications Inc. > + * > + * This program is free software; you can redistribute it and/or modify it > + * under the terms of the GNU General Public License version 2 as published > + * by the Free Software Foundation, incorporated herein by reference. > + */ > + > +/* Theory of operation: > + * > + * PTP support is assisted by firmware running on the MC, which provides > + * the hardware timestamping capabilities. Both transmitted and received > + * PTP event packets are queued onto internal queues for subsequent processing; > + * this is because the MC operations are relatively long and would block > + * block NAPI/interrupt operation. > + * > + * Receive event processing: > + * The event contains the packet's UUID and sequence number, together > + * with the hardware timestamp. The PTP receive packet queue is searched > + * for this UUID/sequence number and, if found, put on a pending queue. > + * Packets not matching are delivered without timestamps (MCDI events will > + * always arrive after the actual packet). > + * It is important for the operation of the PTP protocol that the ordering > + * of packets between the event and general port is maintained. > + * > + * Work queue processing: > + * If work waiting, synchronise host/hardware time > + * > + * Transmit: send packet through MC, which returns the transmission time > + * that is converted to an appropriate timestamp. > + * > + * Receive: the packet's reception time is converted to an appropriate > + * timestamp. > + */ > +#include <linux/ip.h> > +#include <linux/udp.h> > +#include <linux/time.h> > +#include <linux/ktime.h> > +#include <linux/module.h> > +#include <linux/net_tstamp.h> > +#include <linux/ptp_clock_kernel.h> > +#include "net_driver.h" > +#include "efx.h" > +#include "mcdi.h" > +#include "mcdi_pcol.h" > +#include "io.h" > +#include "regs.h" > +#include "nic.h" > + > +/* Maximum number of events expected to make up a PTP event */ > +#define MAX_EVENT_FRAGS 3 > + > +/* Maximum delay, ms, to begin synchronisation */ > +#define MAX_SYNCHRONISE_WAIT_MS 2 > + > +/* How long, at most, to spend synchronising */ > +#define SYNCHRONISE_PERIOD_NS 250000 > + > +/* How often to update the shared memory time */ > +#define SYNCHRONISATION_GRANULARITY_NS 200 > + > +/* Minimum permitted length of a (corrected) synchronisation time */ > +#define MIN_SYNCHRONISATION_NS 120 > + > +/* Maximum permitted length of a (corrected) synchronisation time */ > +#define MAX_SYNCHRONISATION_NS 1000 > + > +/* How many (MC) receive events that can be queued */ > +#define MAX_RECEIVE_EVENTS 8 > + > +/* Length of (modified) moving average. */ > +#define AVERAGE_LENGTH 16 > + > +/* How long an unmatched event or packet can be held */ > +#define PKT_EVENT_LIFETIME_MS 10 > + > +/* Offsets into PTP packet for identification. These offsets are from the > + * start of the IP header, not the MAC header. Note that neither PTP V1 nor > + * PTP V2 permit the use of IPV4 options. > + */ > +#define PTP_DPORT_OFFSET 22 > + > +#define PTP_V1_VERSION_LENGTH 2 > +#define PTP_V1_VERSION_OFFSET 28 > + > +#define PTP_V1_UUID_LENGTH 6 > +#define PTP_V1_UUID_OFFSET 50 > + > +#define PTP_V1_SEQUENCE_LENGTH 2 > +#define PTP_V1_SEQUENCE_OFFSET 58 > + > +/* The minimum length of a PTP V1 packet for offsets, etc. to be valid: > + * includes IP header. > + */ > +#define PTP_V1_MIN_LENGTH 64 > + > +#define PTP_V2_VERSION_LENGTH 1 > +#define PTP_V2_VERSION_OFFSET 29 > + > +/* Although PTP V2 UUIDs are comprised a ClockIdentity (8) and PortNumber (2), > + * the MC only captures the last six bytes of the clock identity. These values > + * reflect those, not the ones used in the standard. The standard permits > + * mapping of V1 UUIDs to V2 UUIDs with these same values. > + */ > +#define PTP_V2_MC_UUID_LENGTH 6 > +#define PTP_V2_MC_UUID_OFFSET 50 > + > +#define PTP_V2_SEQUENCE_LENGTH 2 > +#define PTP_V2_SEQUENCE_OFFSET 58 > + > +/* The minimum length of a PTP V2 packet for offsets, etc. to be valid: > + * includes IP header. > + */ > +#define PTP_V2_MIN_LENGTH 63 > + > +#define PTP_MIN_LENGTH 63 > + > +#define PTP_ADDRESS 0xe0000181 /* 224.0.1.129 */ > +#define PTP_EVENT_PORT 319 > +#define PTP_GENERAL_PORT 320 > + > +/* Annoyingly the format of the version numbers are different between > + * versions 1 and 2 so it isn't possible to simply look for 1 or 2. > + */ > +#define PTP_VERSION_V1 1 > + > +#define PTP_VERSION_V2 2 > +#define PTP_VERSION_V2_MASK 0x0f > + > +enum ptp_packet_state { > + PTP_PACKET_STATE_UNMATCHED = 0, > + PTP_PACKET_STATE_MATCHED, > + PTP_PACKET_STATE_TIMED_OUT, > + PTP_PACKET_STATE_MATCH_UNWANTED > +}; > + > +/* NIC synchronised with single word of time only comprising > + * partial seconds and full nanoseconds: 10^9 ~ 2^30 so 2 bits for seconds. > + */ > +#define MC_NANOSECOND_BITS 30 > +#define MC_NANOSECOND_MASK ((1 << MC_NANOSECOND_BITS) - 1) > +#define MC_SECOND_MASK ((1 << (32 - MC_NANOSECOND_BITS)) - 1) > + > +/* Maximum parts-per-billion adjustment that is acceptable */ > +#define MAX_PPB 1000000 > + > +/* Number of bits required to hold the above */ > +#define MAX_PPB_BITS 20 > + > +/* Number of extra bits allowed when calculating fractional ns. > + * EXTRA_BITS + MC_CMD_PTP_IN_ADJUST_BITS + MAX_PPB_BITS should > + * be less than 63. > + */ > +#define PPB_EXTRA_BITS 2 > + > +/* Precalculate scale word to avoid long long division at runtime */ > +#define PPB_SCALE_WORD ((1LL << (PPB_EXTRA_BITS + MC_CMD_PTP_IN_ADJUST_BITS +\ > + MAX_PPB_BITS)) / 1000000000LL) > + > +#define PTP_SYNC_ATTEMPTS 4 > + > +/** > + * struct efx_ptp_match - Matching structure, stored in sk_buff's cb area. > + * @words: UUID and (partial) sequence number > + * @expiry: Time after which the packet should be delivered irrespective of > + * event arrival. > + * @state: The state of the packet - whether it is ready for processing or > + * whether that is of no interest. > + */ > +struct efx_ptp_match { > + u32 words[DIV_ROUND_UP(PTP_V1_UUID_LENGTH, 4)]; > + unsigned long expiry; > + enum ptp_packet_state state; > +}; > + > +/** > + * struct efx_ptp_event_rx - A PTP receive event (from MC) > + * @seq0: First part of (PTP) UUID > + * @seq1: Second part of (PTP) UUID and sequence number > + * @hwtimestamp: Event timestamp > + */ > +struct efx_ptp_event_rx { > + struct list_head link; > + u32 seq0; > + u32 seq1; > + ktime_t hwtimestamp; > + unsigned long expiry; > +}; > + > +/** > + * struct efx_ptp_timeset - Synchronisation between host and MC > + * @host_start: Host time immediately before hardware timestamp taken > + * @seconds: Hardware timestamp, seconds > + * @nanoseconds: Hardware timestamp, nanoseconds > + * @host_end: Host time immediately after hardware timestamp taken > + * @waitns: Number of nanoseconds between hardware timestamp being read and > + * host end time being seen > + * @window: Difference of host_end and host_start > + * @valid: Whether this timeset is valid > + */ > +struct efx_ptp_timeset { > + u32 host_start; > + u32 seconds; > + u32 nanoseconds; > + u32 host_end; > + u32 waitns; > + u32 window; /* Derived: end - start, allowing for wrap */ > +}; > + > +/** > + * struct efx_ptp_data - Precision Time Protocol (PTP) state > + * @channel: The PTP channel > + * @rxq: Receive queue (awaiting timestamps) > + * @txq: Transmit queue > + * @evt_list: List of MC receive events awaiting packets > + * @evt_free_list: List of free events > + * @evt_lock: Lock for manipulating evt_list and evt_free_list > + * @rx_evts: Instantiated events (on evt_list and evt_free_list) > + * @workwq: Work queue for processing pending PTP operations > + * @work: Work task > + * @reset_required: A serious error has occurred and the PTP task needs to be > + * reset (disable, enable). > + * @rxfilter_event: Receive filter when operating > + * @rxfilter_general: Receive filter when operating > + * @config: Current timestamp configuration > + * @enabled: PTP operation enabled > + * @mode: Mode in which PTP operating (PTP version) > + * @evt_frags: Partly assembled PTP events > + * @evt_frag_idx: Current fragment number > + * @evt_code: Last event code > + * @start: Address at which MC indicates ready for synchronisation > + * @host_base_time: (Synchronised with mc_base_time) host time > + * @mc_base_time: (Synchronised with host_base_time) MC/hardware time > + * @base_time_valid: Whether host_base_time and mc_base_time are synchronised > + * @last_sync_ns: Last number of nanoseconds between readings when synchronising > + * @base_sync_ns: Number of nanoseconds for last synchronisation. > + * @base_sync_valid: Whether base_sync_time is valid. > + * @current_adjfreq: Current ppb adjustment. > + * @phc_clock: Pointer to registered phc device > + * @phc_clock_info: Registration structure for phc device > + * @pps_work: pps work task for handling pps events > + * @pps_workwq: pps work queue > + * @nic_ts_enabled: Flag indicating if NIC generated TS events are handled > + * @txbuf: Buffer for use when transmitting (PTP) packets to MC (avoids > + * allocations in main data path). > + * @debug_ptp_dir: PTP debugfs directory > + * @missed_rx_sync: Number of packets received without syncrhonisation. > + * @good_syncs: Number of successful synchronisations. > + * @no_time_syncs: Number of synchronisations with no good times. > + * @bad_sync_durations: Number of synchronisations with bad durations. > + * @bad_syncs: Number of failed synchronisations. > + * @last_sync_time: Number of nanoseconds for last synchronisation. > + * @sync_timeouts: Number of synchronisation timeouts > + * @fast_syncs: Number of synchronisations requiring short delay > + * @min_sync_delta: Minimum time between event and synchronisation > + * @max_sync_delta: Maximum time between event and synchronisation > + * @average_sync_delta: Average time between event and synchronisation. > + * Modified moving average. > + * @last_sync_delta: Last time between event and synchronisation > + * @mc_stats: Context value for MC statistics > + * @timeset: Last set of synchronisation statistics. > + */ > +struct efx_ptp_data { > + struct efx_channel *channel; > + struct sk_buff_head rxq; > + struct sk_buff_head txq; > + struct list_head evt_list; > + struct list_head evt_free_list; > + spinlock_t evt_lock; > + struct efx_ptp_event_rx rx_evts[MAX_RECEIVE_EVENTS]; > + struct workqueue_struct *workwq; > + struct work_struct work; > + bool reset_required; > + u32 rxfilter_event; > + u32 rxfilter_general; > + bool rxfilter_installed; > + struct hwtstamp_config config; > + bool enabled; > + unsigned int mode; > + efx_qword_t evt_frags[MAX_EVENT_FRAGS]; > + int evt_frag_idx; > + int evt_code; > + struct efx_buffer start; > + ktime_t host_base_time; > + ktime_t mc_base_time; > + bool base_time_valid; > + unsigned last_sync_ns; > + unsigned base_sync_ns; > + bool base_sync_valid; > + s64 current_adjfreq; > + struct ptp_clock *phc_clock; > + struct ptp_clock_info phc_clock_info; > + struct work_struct pps_work; > + struct workqueue_struct *pps_workwq; > + bool nic_ts_enabled; > + u8 txbuf[ALIGN(MC_CMD_PTP_IN_TRANSMIT_LEN( > + MC_CMD_PTP_IN_TRANSMIT_PACKET_MAXNUM), 4)]; > + struct efx_ptp_timeset > + timeset[MC_CMD_PTP_OUT_SYNCHRONIZE_TIMESET_MAXNUM]; > +}; > + > +static int efx_phc_adjfreq(struct ptp_clock_info *ptp, s32 delta); > +static int efx_phc_adjtime(struct ptp_clock_info *ptp, s64 delta); > +static int efx_phc_gettime(struct ptp_clock_info *ptp, struct timespec *ts); > +static int efx_phc_settime(struct ptp_clock_info *ptp, > + const struct timespec *e_ts); > +static int efx_phc_enable(struct ptp_clock_info *ptp, > + struct ptp_clock_request *request, int on); > + > +/* Enable MCDI PTP support. */ > +static int efx_ptp_enable(struct efx_nic *efx) > +{ > + u8 inbuf[MC_CMD_PTP_IN_ENABLE_LEN]; > + > + MCDI_SET_DWORD(inbuf, PTP_IN_OP, MC_CMD_PTP_OP_ENABLE); > + MCDI_SET_DWORD(inbuf, PTP_IN_ENABLE_QUEUE, > + efx->ptp_data->channel->channel); > + MCDI_SET_DWORD(inbuf, PTP_IN_ENABLE_MODE, efx->ptp_data->mode); > + > + return efx_mcdi_rpc(efx, MC_CMD_PTP, inbuf, sizeof(inbuf), > + NULL, 0, NULL); > +} > + > +/* Disable MCDI PTP support. > + * > + * Note that this function should never rely on the presence of ptp_data - > + * may be called before that exists. > + */ > +static int efx_ptp_disable(struct efx_nic *efx) > +{ > + u8 inbuf[MC_CMD_PTP_IN_DISABLE_LEN]; > + > + MCDI_SET_DWORD(inbuf, PTP_IN_OP, MC_CMD_PTP_OP_DISABLE); > + return efx_mcdi_rpc(efx, MC_CMD_PTP, inbuf, sizeof(inbuf), > + NULL, 0, NULL); > +} > + > +static void efx_ptp_deliver_rx_queue(struct sk_buff_head *q) > +{ > + struct sk_buff *skb; > + > + while ((skb = skb_dequeue(q))) { > + local_bh_disable(); > + netif_receive_skb(skb); > + local_bh_enable(); > + } > +} > + > +static void efx_ptp_handle_no_channel(struct efx_nic *efx) > +{ > + netif_err(efx, drv, efx->net_dev, > + "ERROR: PTP requires MSI-X and 1 additional interrupt" > + "vector. PTP disabled\n"); > +} > + > +/* Repeatedly send the host time to the MC which will capture the hardware > + * time. > + */ > +static void efx_ptp_send_times(struct efx_nic *efx, struct timespec *last_time) > +{ > + struct timespec now; > + struct timespec limit; > + struct efx_ptp_data *ptp = efx->ptp_data; > + struct timespec start; > + int *mc_running = ptp->start.addr; > + > + getnstimeofday(&now); > + start = now; > + limit = now; > + timespec_add_ns(&limit, SYNCHRONISE_PERIOD_NS); > + > + /* Write host time for specified period or until MC is done */ > + while ((timespec_compare(&now, &limit) < 0) && > + ACCESS_ONCE(*mc_running)) { > + struct timespec update_time; > + unsigned int host_time; > + > + /* Don't update continuously to avoid saturating the PCIe bus */ > + update_time = now; > + timespec_add_ns(&update_time, SYNCHRONISATION_GRANULARITY_NS); > + do { > + getnstimeofday(&now); > + } while ((timespec_compare(&now, &update_time) < 0) && > + ACCESS_ONCE(*mc_running)); > + > + /* Synchronise NIC with single word of time only */ > + host_time = (now.tv_sec << MC_NANOSECOND_BITS) | now.tv_nsec; > + /* Update host time in NIC memory */ > + _efx_writed(efx, host_time, > + FR_CZ_MC_TREG_SMEM + MC_SMEM_P0_PTP_TIME_OFST); > + } > + *last_time = now; > + start = timespec_sub(now, start); > +} > + > +/* Read a timeset from the MC's results and partial process. */ > +static void efx_ptp_read_timeset(u8 *data, struct efx_ptp_timeset *timeset) > +{ > + unsigned start_ns, end_ns; > + > + timeset->host_start = MCDI_DWORD(data, PTP_OUT_SYNCHRONIZE_HOSTSTART); > + timeset->seconds = MCDI_DWORD(data, PTP_OUT_SYNCHRONIZE_SECONDS); > + timeset->nanoseconds = MCDI_DWORD(data, > + PTP_OUT_SYNCHRONIZE_NANOSECONDS); > + timeset->host_end = MCDI_DWORD(data, PTP_OUT_SYNCHRONIZE_HOSTEND), > + timeset->waitns = MCDI_DWORD(data, PTP_OUT_SYNCHRONIZE_WAITNS); > + > + /* Ignore seconds */ > + start_ns = timeset->host_start & MC_NANOSECOND_MASK; > + end_ns = timeset->host_end & MC_NANOSECOND_MASK; > + /* Allow for rollover */ > + if (end_ns < start_ns) > + end_ns += NSEC_PER_SEC; > + /* Determine duration of operation */ > + timeset->window = end_ns - start_ns; > +} > + > +/* Process times received from MC. > + * > + * Extract times from returned results, and establish the minimum value > + * seen. The minimum value represents the "best" possible time and events > + * too much greater than this are rejected - the machine is, perhaps, too > + * busy. A number of readings are taken so that, hopefully, at least one good > + * synchronisation will be seen in the results. > + */ This code looks like it is trying to find the offset between two clocks. Is there some reason why you cannot use <linux/timecompare.h> to accomplish this? Also, these comments about "hopefull" synchronization make me nervous. I think it might be easier just to offer RAW timestamps and forget about the SYS timestamps. I am trying to purge the whole SYS thing (only blackfin is left) because there is a much better way to go about this, namely synchronizing the system time to the PHC time via an internal PPS signal. > +static int efx_ptp_process_times(struct efx_nic *efx, u8 *synch_buf, > + size_t response_length, > + struct timespec *last_time) > +{ > + unsigned number_readings = (response_length / > + MC_CMD_PTP_OUT_SYNCHRONIZE_TIMESET_LEN); > + unsigned i; > + unsigned min; > + unsigned min_set = 0; > + unsigned total; > + unsigned ngood = 0; > + unsigned last_good = 0; > + struct efx_ptp_data *ptp = efx->ptp_data; > + bool min_valid = false; > + u32 last_sec; > + u32 start_sec; > + > + if (number_readings == 0) > + return -EAGAIN; > + > + /* Find minimum value in this set of results, discarding clearly > + * erroneous results. > + */ > + for (i = 0; i < number_readings; i++) { > + efx_ptp_read_timeset(synch_buf, &ptp->timeset[i]); > + synch_buf += MC_CMD_PTP_OUT_SYNCHRONIZE_TIMESET_LEN; > + if (ptp->timeset[i].window > SYNCHRONISATION_GRANULARITY_NS) { > + if (min_valid) { > + if (ptp->timeset[i].window < min_set) > + min_set = ptp->timeset[i].window; > + } else { > + min_valid = true; > + min_set = ptp->timeset[i].window; > + } > + } > + } > + > + if (min_valid) { > + if (ptp->base_sync_valid && (min_set > ptp->base_sync_ns)) > + min = ptp->base_sync_ns; > + else > + min = min_set; > + } else { > + min = SYNCHRONISATION_GRANULARITY_NS; > + } > + > + /* Discard excessively long synchronise durations. The MC times > + * when it finishes reading the host time so the corrected window > + * time should be fairly constant for a given platform. > + */ > + total = 0; > + for (i = 0; i < number_readings; i++) > + if (ptp->timeset[i].window > ptp->timeset[i].waitns) { > + unsigned win; > + > + win = ptp->timeset[i].window - ptp->timeset[i].waitns; > + if (win >= MIN_SYNCHRONISATION_NS && > + win < MAX_SYNCHRONISATION_NS) { > + total += ptp->timeset[i].window; > + ngood++; > + last_good = i; > + } > + } > + > + if (ngood == 0) { > + netif_warn(efx, drv, efx->net_dev, > + "PTP no suitable synchronisations %dns %dns\n", > + ptp->base_sync_ns, min_set); > + return -EAGAIN; > + } > + > + /* Average minimum this synchronisation */ > + ptp->last_sync_ns = DIV_ROUND_UP(total, ngood); > + if (!ptp->base_sync_valid || (ptp->last_sync_ns < ptp->base_sync_ns)) { > + ptp->base_sync_valid = true; > + ptp->base_sync_ns = ptp->last_sync_ns; > + } > + > + ptp->mc_base_time = ktime_set(ptp->timeset[last_good].seconds, > + ptp->timeset[last_good].nanoseconds); > + last_time->tv_nsec = > + ptp->timeset[last_good].host_start & MC_NANOSECOND_MASK; > + > + /* It is possible that the seconds rolled over between taking > + * the start reading and the last value written by the host. The > + * timescales are such that a gap of more than one second is never > + * expected. > + */ > + start_sec = ptp->timeset[last_good].host_start >> MC_NANOSECOND_BITS; > + last_sec = last_time->tv_sec & MC_SECOND_MASK; > + if (start_sec != last_sec) { > + if (((start_sec + 1) & MC_SECOND_MASK) != last_sec) { > + netif_warn(efx, hw, efx->net_dev, > + "PTP bad synchronisation seconds\n"); > + return -EAGAIN; > + } else { > + last_time->tv_sec--; > + } > + } > + ptp->host_base_time = ktime_set(last_time->tv_sec, > + last_time->tv_nsec); > + > + /* At least one good synchronisation */ > + ptp->base_time_valid = true; > + > + return 0; > +} > + > +/* Synchronize times between the host and the MC */ > +static int efx_ptp_synchronize(struct efx_nic *efx, unsigned int num_readings) > +{ > + struct efx_ptp_data *ptp = efx->ptp_data; > + u8 synch_buf[MC_CMD_PTP_OUT_SYNCHRONIZE_LENMAX]; > + size_t response_length; > + int rc; > + unsigned long timeout; > + struct timespec last_time; > + unsigned int loops = 0; > + int *start = ptp->start.addr; > + > + last_time.tv_sec = 0; > + last_time.tv_nsec = 0; > + > + MCDI_SET_DWORD(synch_buf, PTP_IN_OP, MC_CMD_PTP_OP_SYNCHRONIZE); > + MCDI_SET_DWORD(synch_buf, PTP_IN_SYNCHRONIZE_NUMTIMESETS, > + num_readings); > + MCDI_SET_DWORD(synch_buf, PTP_IN_SYNCHRONIZE_START_ADDR_LO, > + (u32)ptp->start.dma_addr); > + MCDI_SET_DWORD(synch_buf, PTP_IN_SYNCHRONIZE_START_ADDR_HI, > + (u32)((u64)ptp->start.dma_addr >> 32)); > + > + /* Clear flag that signals MC ready */ > + ACCESS_ONCE(*start) = 0; > + efx_mcdi_rpc_start(efx, MC_CMD_PTP, synch_buf, > + MC_CMD_PTP_IN_SYNCHRONIZE_LEN); > + > + /* Wait for start from MCDI (or timeout) */ > + timeout = jiffies + msecs_to_jiffies(MAX_SYNCHRONISE_WAIT_MS); > + while (!ACCESS_ONCE(*start) && (time_before(jiffies, timeout))) { > + udelay(20); /* Usually start MCDI execution quickly */ > + loops++; > + } > + > + if (ACCESS_ONCE(*start)) > + efx_ptp_send_times(efx, &last_time); > + > + /* Collect results */ > + rc = efx_mcdi_rpc_finish(efx, MC_CMD_PTP, > + MC_CMD_PTP_IN_SYNCHRONIZE_LEN, > + synch_buf, sizeof(synch_buf), > + &response_length); > + if (rc == 0) > + rc = efx_ptp_process_times(efx, synch_buf, response_length, > + &last_time); > + > + return rc; > +} > + > +/* Get the host time from a given hardware time */ > +static bool efx_ptp_get_host_time(struct efx_nic *efx, > + struct skb_shared_hwtstamps *timestamps) > +{ > + if (efx->ptp_data->base_time_valid) { > + ktime_t diff = ktime_sub(timestamps->hwtstamp, > + efx->ptp_data->mc_base_time); > + > + timestamps->syststamp = ktime_add(efx->ptp_data->host_base_time, > + diff); > + } > + > + return efx->ptp_data->base_time_valid; > +} > + > +/* Transmit a PTP packet, via the MCDI interface, to the wire. */ > +static int efx_ptp_xmit_skb(struct efx_nic *efx, struct sk_buff *skb) > +{ > + u8 *txbuf = efx->ptp_data->txbuf; > + struct skb_shared_hwtstamps timestamps; > + int rc = -EIO; > + /* MCDI driver requires word aligned lengths */ > + size_t len = ALIGN(MC_CMD_PTP_IN_TRANSMIT_LEN(skb->len), 4); > + u8 txtime[MC_CMD_PTP_OUT_TRANSMIT_LEN]; > + > + MCDI_SET_DWORD(txbuf, PTP_IN_OP, MC_CMD_PTP_OP_TRANSMIT); > + MCDI_SET_DWORD(txbuf, PTP_IN_TRANSMIT_LENGTH, skb->len); > + if (skb_shinfo(skb)->nr_frags != 0) { > + rc = skb_linearize(skb); > + if (rc != 0) > + goto fail; > + } > + > + if (skb->ip_summed == CHECKSUM_PARTIAL) { > + rc = skb_checksum_help(skb); > + if (rc != 0) > + goto fail; > + } > + skb_copy_from_linear_data(skb, > + &txbuf[MC_CMD_PTP_IN_TRANSMIT_PACKET_OFST], > + len); > + rc = efx_mcdi_rpc(efx, MC_CMD_PTP, txbuf, len, txtime, > + sizeof(txtime), &len); > + if (rc != 0) > + goto fail; > + > + memset(×tamps, 0, sizeof(timestamps)); > + timestamps.hwtstamp = ktime_set( > + MCDI_DWORD(txtime, PTP_OUT_TRANSMIT_SECONDS), > + MCDI_DWORD(txtime, PTP_OUT_TRANSMIT_NANOSECONDS)); > + if (efx_ptp_get_host_time(efx, ×tamps)) > + skb_tstamp_tx(skb, ×tamps); > + /* Success even if hardware timestamping failed */ > + rc = 0; > + > +fail: > + dev_kfree_skb(skb); > + > + return rc; > +} > + > +static void efx_ptp_drop_time_expired_events(struct efx_nic *efx) > +{ > + struct efx_ptp_data *ptp = efx->ptp_data; > + struct list_head *cursor; > + struct list_head *next; > + > + /* Drop time-expired events */ > + spin_lock_bh(&ptp->evt_lock); > + if (!list_empty(&ptp->evt_list)) { > + list_for_each_safe(cursor, next, &ptp->evt_list) { > + struct efx_ptp_event_rx *evt; > + > + evt = list_entry(cursor, struct efx_ptp_event_rx, > + link); > + if (time_after(jiffies, evt->expiry)) { > + list_del(&evt->link); > + list_add(&evt->link, &ptp->evt_free_list); > + netif_warn(efx, hw, efx->net_dev, > + "PTP rx event dropped\n"); > + } > + } > + } > + spin_unlock_bh(&ptp->evt_lock); > +} > + > +static enum ptp_packet_state efx_ptp_match_rx(struct efx_nic *efx, > + struct sk_buff *skb) > +{ > + struct efx_ptp_data *ptp = efx->ptp_data; > + bool evts_waiting; > + struct list_head *cursor; > + struct list_head *next; > + struct efx_ptp_match *match; > + enum ptp_packet_state rc = PTP_PACKET_STATE_UNMATCHED; > + > + spin_lock_bh(&ptp->evt_lock); > + evts_waiting = !list_empty(&ptp->evt_list); > + spin_unlock_bh(&ptp->evt_lock); > + > + if (!evts_waiting) > + return PTP_PACKET_STATE_UNMATCHED; > + > + match = (struct efx_ptp_match *)skb->cb; > + /* Look for a matching timestamp in the event queue */ > + spin_lock_bh(&ptp->evt_lock); > + list_for_each_safe(cursor, next, &ptp->evt_list) { > + struct efx_ptp_event_rx *evt; > + > + evt = list_entry(cursor, struct efx_ptp_event_rx, link); > + if ((evt->seq0 == match->words[0]) && > + (evt->seq1 == match->words[1])) { > + struct skb_shared_hwtstamps *timestamps; > + > + /* Match - add in hardware timestamp */ > + timestamps = skb_hwtstamps(skb); > + timestamps->hwtstamp = evt->hwtimestamp; > + > + match->state = PTP_PACKET_STATE_MATCHED; > + rc = PTP_PACKET_STATE_MATCHED; > + list_del(&evt->link); > + list_add(&evt->link, &ptp->evt_free_list); > + break; > + } > + } > + spin_unlock_bh(&ptp->evt_lock); > + > + return rc; > +} > + > +/* Process any queued receive events and corresponding packets > + * > + * q is returned with all the packets that are ready for delivery. > + * true is returned if at least one of those packets requires > + * synchronisation. > + */ > +static bool efx_ptp_process_events(struct efx_nic *efx, struct sk_buff_head *q) > +{ > + struct efx_ptp_data *ptp = efx->ptp_data; > + bool rc = false; > + struct sk_buff *skb; > + > + while ((skb = skb_dequeue(&ptp->rxq))) { > + struct efx_ptp_match *match; > + > + match = (struct efx_ptp_match *)skb->cb; > + if (match->state == PTP_PACKET_STATE_MATCH_UNWANTED) { > + __skb_queue_tail(q, skb); > + } else if (efx_ptp_match_rx(efx, skb) == > + PTP_PACKET_STATE_MATCHED) { > + rc = true; > + __skb_queue_tail(q, skb); > + } else if (time_after(jiffies, match->expiry)) { > + match->state = PTP_PACKET_STATE_TIMED_OUT; > + netif_warn(efx, rx_err, efx->net_dev, > + "PTP packet - no timestamp seen\n"); > + __skb_queue_tail(q, skb); > + } else { > + /* Replace unprocessed entry and stop */ > + skb_queue_head(&ptp->rxq, skb); > + break; > + } > + } > + > + return rc; > +} > + > +/* Complete processing of a received packet */ > +static void efx_ptp_process_rx(struct efx_nic *efx, struct sk_buff *skb) > +{ > + struct efx_ptp_match *match = (struct efx_ptp_match *)skb->cb; > + > + /* Translate timestamps, as required */ > + if (match->state == PTP_PACKET_STATE_MATCHED) { > + struct skb_shared_hwtstamps *timestamps; > + > + timestamps = skb_hwtstamps(skb); > + efx_ptp_get_host_time(efx, timestamps); > + } > + > + local_bh_disable(); > + netif_receive_skb(skb); > + local_bh_enable(); > +} > + > +static int efx_ptp_start(struct efx_nic *efx) > +{ > + struct efx_ptp_data *ptp = efx->ptp_data; > + struct efx_filter_spec rxfilter; > + int rc; > + > + ptp->reset_required = false; > + > + /* Must resynchronise when starting */ > + ptp->base_time_valid = false; > + ptp->base_sync_valid = false; > + > + /* Must filter on both event and general ports to ensure > + * that there is no packet re-ordering. > + */ > + efx_filter_init_rx(&rxfilter, EFX_FILTER_PRI_REQUIRED, 0, > + efx_rx_queue_index( > + efx_channel_get_rx_queue(ptp->channel))); > + rc = efx_filter_set_ipv4_local(&rxfilter, IPPROTO_UDP, > + htonl(PTP_ADDRESS), > + htons(PTP_EVENT_PORT)); > + if (rc != 0) > + return rc; > + > + rc = efx_filter_insert_filter(efx, &rxfilter, true); > + if (rc < 0) > + return rc; > + ptp->rxfilter_event = rc; > + > + efx_filter_init_rx(&rxfilter, EFX_FILTER_PRI_REQUIRED, 0, > + efx_rx_queue_index( > + efx_channel_get_rx_queue(ptp->channel))); > + rc = efx_filter_set_ipv4_local(&rxfilter, IPPROTO_UDP, > + htonl(PTP_ADDRESS), > + htons(PTP_GENERAL_PORT)); > + if (rc != 0) > + goto fail; > + > + rc = efx_filter_insert_filter(efx, &rxfilter, true); > + if (rc < 0) > + goto fail; > + ptp->rxfilter_general = rc; > + > + rc = efx_ptp_enable(efx); > + if (rc != 0) > + goto fail2; > + > + ptp->evt_frag_idx = 0; > + ptp->current_adjfreq = 0; > + ptp->rxfilter_installed = true; > + > + return 0; > + > +fail2: > + efx_filter_remove_id_safe(efx, EFX_FILTER_PRI_REQUIRED, > + ptp->rxfilter_general); > +fail: > + efx_filter_remove_id_safe(efx, EFX_FILTER_PRI_REQUIRED, > + ptp->rxfilter_event); > + > + return rc; > +} > + > +static int efx_ptp_stop(struct efx_nic *efx) > +{ > + struct efx_ptp_data *ptp = efx->ptp_data; > + int rc = efx_ptp_disable(efx); > + struct list_head *cursor; > + struct list_head *next; > + > + if (ptp->rxfilter_installed) { > + efx_filter_remove_id_safe(efx, EFX_FILTER_PRI_REQUIRED, > + ptp->rxfilter_general); > + efx_filter_remove_id_safe(efx, EFX_FILTER_PRI_REQUIRED, > + ptp->rxfilter_event); > + ptp->rxfilter_installed = false; > + } > + > + /* Make sure RX packets are really delivered */ > + efx_ptp_deliver_rx_queue(&efx->ptp_data->rxq); > + skb_queue_purge(&efx->ptp_data->txq); > + > + /* Drop any pending receive events */ > + spin_lock_bh(&efx->ptp_data->evt_lock); > + list_for_each_safe(cursor, next, &efx->ptp_data->evt_list) { > + list_del(cursor); > + list_add(cursor, &efx->ptp_data->evt_free_list); > + } > + spin_unlock_bh(&efx->ptp_data->evt_lock); > + > + return rc; > +} > + > +static void efx_ptp_pps_worker(struct work_struct *work) > +{ > + struct efx_ptp_data *ptp = > + container_of(work, struct efx_ptp_data, pps_work); > + struct efx_nic *efx = ptp->channel->efx; > + struct timespec event_gen_time; > + struct ptp_clock_event ptp_pps_evt; > + ktime_t gen_time_host; > + > + if (efx_ptp_synchronize(efx, PTP_SYNC_ATTEMPTS)) > + return; > + > + gen_time_host = ktime_sub(ptp->mc_base_time, > + ptp->host_base_time); > + event_gen_time = ktime_to_timespec(gen_time_host); > + > + ptp_pps_evt.type = PTP_CLOCK_EXTTS; > + ptp_pps_evt.timestamp = ktime_to_ns(gen_time_host); > + ptp_clock_event(ptp->phc_clock, &ptp_pps_evt); > +} > + > +/* Process any pending transmissions and timestamp any received packets. > + * > + * Host and NIC time are synchronised once if there is any work to do: > + * the process is relatively expensive so don't do it for each packet. > + */ > +static void efx_ptp_worker(struct work_struct *work) > +{ > + struct efx_ptp_data *ptp_data = > + container_of(work, struct efx_ptp_data, work); > + struct efx_nic *efx = ptp_data->channel->efx; > + struct sk_buff *skb; > + struct sk_buff_head tempq; > + > + if (ptp_data->reset_required) { > + efx_ptp_stop(efx); > + efx_ptp_start(efx); > + return; > + } > + > + efx_ptp_drop_time_expired_events(efx); > + > + __skb_queue_head_init(&tempq); > + if (efx_ptp_process_events(efx, &tempq) || > + !skb_queue_empty(&ptp_data->txq)) { > + /* Synchronise PC/MC times when there's work to do. This > + * isn't fatal but would be unusual (because of the retries > + * within efx_ptp_synchronize). Failure may suggest a heavily > + * overloaded system. > + */ > + if (0 != efx_ptp_synchronize(efx, PTP_SYNC_ATTEMPTS)) > + netif_warn(efx, drv, efx->net_dev, > + "PTP couldn't get synchronisation\n"); > + > + while ((skb = skb_dequeue(&ptp_data->txq))) > + efx_ptp_xmit_skb(efx, skb); > + } > + > + while ((skb = __skb_dequeue(&tempq))) > + efx_ptp_process_rx(efx, skb); > +} > + > +/* Initialise PTP channel and state. > + * > + * Setting core_index to zero causes the queue to be initialised and doesn't > + * overlap with 'rxq0' because ptp.c doesn't use skb_record_rx_queue. > + */ > +static int efx_ptp_probe_channel(struct efx_channel *channel) > +{ > + struct efx_nic *efx = channel->efx; > + struct efx_ptp_data *ptp; > + int rc = 0; > + unsigned int pos; > + > + channel->irq_moderation = 0; > + channel->rx_queue.core_index = 0; > + > + ptp = kzalloc(sizeof(struct efx_ptp_data), GFP_KERNEL); > + efx->ptp_data = ptp; > + if (!efx->ptp_data) > + return -ENOMEM; > + > + rc = efx_nic_alloc_buffer(efx, &ptp->start, sizeof(int)); > + if (rc != 0) > + goto fail1; > + > + ptp->channel = channel; > + skb_queue_head_init(&ptp->rxq); > + skb_queue_head_init(&ptp->txq); > + ptp->workwq = create_singlethread_workqueue("sfc_ptp"); > + if (!ptp->workwq) { > + rc = -ENOMEM; > + goto fail2; > + } > + > + INIT_WORK(&ptp->work, efx_ptp_worker); > + ptp->config.flags = 0; > + ptp->config.tx_type = HWTSTAMP_TX_OFF; > + ptp->config.rx_filter = HWTSTAMP_FILTER_NONE; > + INIT_LIST_HEAD(&ptp->evt_list); > + INIT_LIST_HEAD(&ptp->evt_free_list); > + spin_lock_init(&ptp->evt_lock); > + for (pos = 0; pos < MAX_RECEIVE_EVENTS; pos++) > + list_add(&ptp->rx_evts[pos].link, &ptp->evt_free_list); > + > + ptp->phc_clock_info.owner = THIS_MODULE; > + snprintf(ptp->phc_clock_info.name, > + sizeof(ptp->phc_clock_info.name), > + "%pm", efx->net_dev->perm_addr); > + ptp->phc_clock_info.max_adj = MAX_PPB; > + ptp->phc_clock_info.n_alarm = 0; > + ptp->phc_clock_info.n_ext_ts = 1; > + ptp->phc_clock_info.n_per_out = 0; > + ptp->phc_clock_info.pps = 0; > + ptp->phc_clock_info.adjfreq = efx_phc_adjfreq; > + ptp->phc_clock_info.adjtime = efx_phc_adjtime; > + ptp->phc_clock_info.gettime = efx_phc_gettime; > + ptp->phc_clock_info.settime = efx_phc_settime; > + ptp->phc_clock_info.enable = efx_phc_enable; > + > + ptp->phc_clock = ptp_clock_register(&ptp->phc_clock_info); > + if (!ptp->phc_clock) > + goto fail3; > + > + INIT_WORK(&ptp->pps_work, efx_ptp_pps_worker); > + ptp->pps_workwq = create_singlethread_workqueue("sfc_pps"); > + if (!ptp->pps_workwq) { > + rc = -ENOMEM; > + goto fail4; > + } > + ptp->nic_ts_enabled = false; > + > + return 0; > +fail4: > + ptp_clock_unregister(efx->ptp_data->phc_clock); > + > +fail3: > + destroy_workqueue(efx->ptp_data->workwq); > + > +fail2: > + efx_nic_free_buffer(efx, &ptp->start); > + > +fail1: > + kfree(efx->ptp_data); > + efx->ptp_data = 0; > + > + return rc; > +} > + > +static void efx_ptp_remove_channel(struct efx_channel *channel) > +{ > + struct efx_nic *efx = channel->efx; > + > + if (!efx->ptp_data) > + return; > + > + (void)efx_ptp_disable(channel->efx); > + > + cancel_work_sync(&efx->ptp_data->work); > + cancel_work_sync(&efx->ptp_data->pps_work); > + > + skb_queue_purge(&efx->ptp_data->rxq); > + skb_queue_purge(&efx->ptp_data->txq); > + > + ptp_clock_unregister(efx->ptp_data->phc_clock); > + > + destroy_workqueue(efx->ptp_data->workwq); > + destroy_workqueue(efx->ptp_data->pps_workwq); > + > + efx_nic_free_buffer(efx, &efx->ptp_data->start); > + kfree(efx->ptp_data); > +} > + > +static void efx_ptp_get_channel_name(struct efx_channel *channel, > + char *buf, size_t len) > +{ > + snprintf(buf, len, "%s-ptp", channel->efx->name); > +} > + > +/* Determine whether this packet should be processed by the PTP module > + * or transmitted conventionally. > + */ > +bool efx_ptp_is_ptp_tx(struct efx_nic *efx, struct sk_buff *skb) > +{ > + return efx->ptp_data && > + efx->ptp_data->enabled && > + skb->len >= PTP_MIN_LENGTH && > + skb->len <= MC_CMD_PTP_IN_TRANSMIT_PACKET_MAXNUM && > + likely(skb->protocol == htons(ETH_P_IP)) && > + ip_hdr(skb)->protocol == IPPROTO_UDP && > + udp_hdr(skb)->dest == htons(PTP_EVENT_PORT); > +} > + > +/* Receive a PTP packet. Packets are queued until the arrival of > + * the receive timestamp from the MC - this will probably occur after the > + * packet arrival because of the processing in the MC. > + */ > +static void efx_ptp_rx(struct efx_channel *channel, struct sk_buff *skb) > +{ > + struct efx_nic *efx = channel->efx; > + struct efx_ptp_data *ptp = efx->ptp_data; > + struct efx_ptp_match *match = (struct efx_ptp_match *)skb->cb; > + u8 *data; > + unsigned int version; > + > + match->expiry = jiffies + msecs_to_jiffies(PKT_EVENT_LIFETIME_MS); > + > + /* Correct version? */ > + if (ptp->mode == MC_CMD_PTP_MODE_V1) { > + if (skb->len < PTP_V1_MIN_LENGTH) { > + netif_receive_skb(skb); > + return; > + } > + version = ntohs(*(__be16 *)&skb->data[PTP_V1_VERSION_OFFSET]); > + if (version != PTP_VERSION_V1) { > + netif_receive_skb(skb); > + return; > + } > + } else { > + if (skb->len < PTP_V2_MIN_LENGTH) { > + netif_receive_skb(skb); > + return; > + } > + version = skb->data[PTP_V2_VERSION_OFFSET]; > + > + BUG_ON(ptp->mode != MC_CMD_PTP_MODE_V2); > + BUILD_BUG_ON(PTP_V1_UUID_OFFSET != PTP_V2_MC_UUID_OFFSET); > + BUILD_BUG_ON(PTP_V1_UUID_LENGTH != PTP_V2_MC_UUID_LENGTH); > + BUILD_BUG_ON(PTP_V1_SEQUENCE_OFFSET != PTP_V2_SEQUENCE_OFFSET); > + BUILD_BUG_ON(PTP_V1_SEQUENCE_LENGTH != PTP_V2_SEQUENCE_LENGTH); > + > + if ((version & PTP_VERSION_V2_MASK) != PTP_VERSION_V2) { > + netif_receive_skb(skb); > + return; > + } > + } > + > + /* Does this packet require timestamping? */ > + if (ntohs(*(__be16 *)&skb->data[PTP_DPORT_OFFSET]) == PTP_EVENT_PORT) { > + struct skb_shared_hwtstamps *timestamps; > + > + match->state = PTP_PACKET_STATE_UNMATCHED; > + > + /* Clear all timestamps held: filled in later */ > + timestamps = skb_hwtstamps(skb); > + memset(timestamps, 0, sizeof(*timestamps)); > + > + /* Extract UUID/Sequence information */ > + data = skb->data + PTP_V1_UUID_OFFSET; > + match->words[0] = (data[0] | > + (data[1] << 8) | > + (data[2] << 16) | > + (data[3] << 24)); > + match->words[1] = (data[4] | > + (data[5] << 8) | > + (skb->data[PTP_V1_SEQUENCE_OFFSET + > + PTP_V1_SEQUENCE_LENGTH - 1] << > + 16)); > + } else { > + match->state = PTP_PACKET_STATE_MATCH_UNWANTED; > + } > + > + skb_queue_tail(&ptp->rxq, skb); > + queue_work(ptp->workwq, &ptp->work); > +} > + > +/* Transmit a PTP packet. This has to be transmitted by the MC > + * itself, through an MCDI call. MCDI calls aren't permitted > + * in the transmit path so defer the actual transmission to a suitable worker. > + */ > +int efx_ptp_tx(struct efx_nic *efx, struct sk_buff *skb) > +{ > + struct efx_ptp_data *ptp = efx->ptp_data; > + > + skb_queue_tail(&ptp->txq, skb); > + > + if ((udp_hdr(skb)->dest == htons(PTP_EVENT_PORT)) && > + (skb->len <= MC_CMD_PTP_IN_TRANSMIT_PACKET_MAXNUM)) > + efx_xmit_hwtstamp_pending(skb); > + queue_work(ptp->workwq, &ptp->work); > + > + return NETDEV_TX_OK; > +} > + > +static int efx_ptp_change_mode(struct efx_nic *efx, bool enable_wanted, > + unsigned int new_mode) > +{ > + if ((enable_wanted != efx->ptp_data->enabled) || > + (enable_wanted && (efx->ptp_data->mode != new_mode))) { > + int rc; > + > + if (enable_wanted) { > + /* Change of mode requires disable */ > + if (efx->ptp_data->enabled && > + (efx->ptp_data->mode != new_mode)) { > + efx->ptp_data->enabled = false; > + rc = efx_ptp_stop(efx); > + if (rc != 0) > + return rc; > + } > + > + /* Set new operating mode and establish > + * baseline synchronisation, which must > + * succeed. > + */ > + efx->ptp_data->mode = new_mode; > + rc = efx_ptp_start(efx); > + if (rc == 0) { > + rc = efx_ptp_synchronize(efx, > + PTP_SYNC_ATTEMPTS * 2); > + if (rc != 0) > + efx_ptp_stop(efx); > + } > + } else { > + rc = efx_ptp_stop(efx); > + } > + > + if (rc != 0) > + return rc; > + > + efx->ptp_data->enabled = enable_wanted; > + } > + > + return 0; > +} > + > +static int efx_ptp_ts_init(struct efx_nic *efx, struct hwtstamp_config *init) > +{ > + bool enable_wanted = false; > + unsigned int new_mode; > + int rc; > + > + if (init->flags) > + return -EINVAL; > + > + if ((init->tx_type != HWTSTAMP_TX_OFF) && > + (init->tx_type != HWTSTAMP_TX_ON)) > + return -ERANGE; > + > + new_mode = efx->ptp_data->mode; > + /* Determine whether any PTP HW operations are required */ > + switch (init->rx_filter) { > + case HWTSTAMP_FILTER_NONE: > + break; > + case HWTSTAMP_FILTER_PTP_V1_L4_EVENT: > + case HWTSTAMP_FILTER_PTP_V1_L4_SYNC: > + case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ: > + init->rx_filter = HWTSTAMP_FILTER_PTP_V1_L4_EVENT; > + new_mode = MC_CMD_PTP_MODE_V1; > + enable_wanted = true; > + break; > + case HWTSTAMP_FILTER_PTP_V2_L4_EVENT: > + case HWTSTAMP_FILTER_PTP_V2_L4_SYNC: > + case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ: > + /* Although these three are accepted only IPV4 packets will be > + * timestamped > + */ > + case HWTSTAMP_FILTER_PTP_V2_EVENT: > + case HWTSTAMP_FILTER_PTP_V2_SYNC: > + case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ: > + init->rx_filter = HWTSTAMP_FILTER_PTP_V2_L4_EVENT; > + new_mode = MC_CMD_PTP_MODE_V2; > + enable_wanted = true; > + break; > + case HWTSTAMP_FILTER_PTP_V2_L2_EVENT: > + case HWTSTAMP_FILTER_PTP_V2_L2_SYNC: > + case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ: > + /* Non-IP timestamping not supported */ > + return -ERANGE; > + break; > + default: > + return -ERANGE; > + } > + > + if (init->tx_type != HWTSTAMP_TX_OFF) > + enable_wanted = true; > + > + rc = efx_ptp_change_mode(efx, enable_wanted, new_mode); > + if (rc != 0) > + return rc; > + > + efx->ptp_data->config = *init; > + > + return 0; > +} > + > +int > +efx_ptp_get_ts_info(struct net_device *net_dev, struct ethtool_ts_info *ts_info) > +{ > + struct efx_nic *efx = netdev_priv(net_dev); > + struct efx_ptp_data *ptp = efx->ptp_data; > + > + if (!ptp) > + return -EOPNOTSUPP; > + > + ts_info->so_timestamping = (SOF_TIMESTAMPING_TX_HARDWARE | > + SOF_TIMESTAMPING_RX_HARDWARE | > + SOF_TIMESTAMPING_SYS_HARDWARE | > + SOF_TIMESTAMPING_RAW_HARDWARE); > + ts_info->phc_index = ptp_clock_index(ptp->phc_clock); > + ts_info->tx_types = 1 << HWTSTAMP_TX_OFF | 1 << HWTSTAMP_TX_ON; > + ts_info->rx_filters = (1 << HWTSTAMP_FILTER_NONE | > + 1 << HWTSTAMP_FILTER_PTP_V1_L4_EVENT | > + 1 << HWTSTAMP_FILTER_PTP_V1_L4_SYNC | > + 1 << HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ | > + 1 << HWTSTAMP_FILTER_PTP_V2_L4_EVENT | > + 1 << HWTSTAMP_FILTER_PTP_V2_L4_SYNC | > + 1 << HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ | > + 1 << HWTSTAMP_FILTER_PTP_V2_EVENT | > + 1 << HWTSTAMP_FILTER_PTP_V2_SYNC | > + 1 << HWTSTAMP_FILTER_PTP_V2_DELAY_REQ); > + return 0; > +} > + > +int efx_ptp_ioctl(struct efx_nic *efx, struct ifreq *ifr, int cmd) > +{ > + struct hwtstamp_config config; > + int rc; > + > + /* Not a PTP enabled port */ > + if (!efx->ptp_data) > + return -EOPNOTSUPP; > + > + if (copy_from_user(&config, ifr->ifr_data, sizeof(config))) > + return -EFAULT; > + > + rc = efx_ptp_ts_init(efx, &config); > + if (rc != 0) > + return rc; > + > + return copy_to_user(ifr->ifr_data, &config, sizeof(config)) > + ? -EFAULT : 0; > +} > + > +static void ptp_event_failure(struct efx_nic *efx, int expected_frag_len) > +{ > + struct efx_ptp_data *ptp = efx->ptp_data; > + > + netif_err(efx, hw, efx->net_dev, > + "PTP unexpected event length: got %d expected %d\n", > + ptp->evt_frag_idx, expected_frag_len); > + ptp->reset_required = true; > + queue_work(ptp->workwq, &ptp->work); > +} > + > +/* Process a completed receive event. Put it on the event queue and > + * start worker thread. This is required because event and their > + * correspoding packets may come in either order. > + */ > +static void ptp_event_rx(struct efx_nic *efx, struct efx_ptp_data *ptp) > +{ > + struct efx_ptp_event_rx *evt = NULL; > + > + if (ptp->evt_frag_idx != 3) { > + ptp_event_failure(efx, 3); > + return; > + } > + > + spin_lock_bh(&ptp->evt_lock); > + if (!list_empty(&ptp->evt_free_list)) { > + evt = list_first_entry(&ptp->evt_free_list, > + struct efx_ptp_event_rx, link); > + list_del(&evt->link); > + > + evt->seq0 = EFX_QWORD_FIELD(ptp->evt_frags[2], MCDI_EVENT_DATA); > + evt->seq1 = (EFX_QWORD_FIELD(ptp->evt_frags[2], > + MCDI_EVENT_SRC) | > + (EFX_QWORD_FIELD(ptp->evt_frags[1], > + MCDI_EVENT_SRC) << 8) | > + (EFX_QWORD_FIELD(ptp->evt_frags[0], > + MCDI_EVENT_SRC) << 16)); > + evt->hwtimestamp = ktime_set( > + EFX_QWORD_FIELD(ptp->evt_frags[0], MCDI_EVENT_DATA), > + EFX_QWORD_FIELD(ptp->evt_frags[1], MCDI_EVENT_DATA)); > + evt->expiry = jiffies + msecs_to_jiffies(PKT_EVENT_LIFETIME_MS); > + list_add_tail(&evt->link, &ptp->evt_list); > + > + queue_work(ptp->workwq, &ptp->work); > + } else { > + netif_err(efx, rx_err, efx->net_dev, "No free PTP event"); > + } > + spin_unlock_bh(&ptp->evt_lock); > +} > + > +static void ptp_event_fault(struct efx_nic *efx, struct efx_ptp_data *ptp) > +{ > + int code = EFX_QWORD_FIELD(ptp->evt_frags[0], MCDI_EVENT_DATA); > + if (ptp->evt_frag_idx != 1) { > + ptp_event_failure(efx, 1); > + return; > + } > + > + netif_err(efx, hw, efx->net_dev, "PTP error %d\n", code); > +} > + > +static void ptp_event_pps(struct efx_nic *efx, struct efx_ptp_data *ptp) > +{ > + if (ptp->nic_ts_enabled) > + queue_work(ptp->pps_workwq, &ptp->pps_work); > +} > + > +void efx_ptp_event(struct efx_nic *efx, efx_qword_t *ev) > +{ > + struct efx_ptp_data *ptp = efx->ptp_data; > + int code = EFX_QWORD_FIELD(*ev, MCDI_EVENT_CODE); > + > + if (!ptp->enabled) > + return; > + > + if (ptp->evt_frag_idx == 0) { > + ptp->evt_code = code; > + } else if (ptp->evt_code != code) { > + netif_err(efx, hw, efx->net_dev, > + "PTP out of sequence event %d\n", code); > + ptp->evt_frag_idx = 0; > + } > + > + ptp->evt_frags[ptp->evt_frag_idx++] = *ev; > + if (!MCDI_EVENT_FIELD(*ev, CONT)) { > + /* Process resulting event */ > + switch (code) { > + case MCDI_EVENT_CODE_PTP_RX: > + ptp_event_rx(efx, ptp); > + break; > + case MCDI_EVENT_CODE_PTP_FAULT: > + ptp_event_fault(efx, ptp); > + break; > + case MCDI_EVENT_CODE_PTP_PPS: > + ptp_event_pps(efx, ptp); > + break; > + default: > + netif_err(efx, hw, efx->net_dev, > + "PTP unknown event %d\n", code); > + break; > + } > + ptp->evt_frag_idx = 0; > + } else if (MAX_EVENT_FRAGS == ptp->evt_frag_idx) { > + netif_err(efx, hw, efx->net_dev, > + "PTP too many event fragments\n"); > + ptp->evt_frag_idx = 0; > + } > +} > + > +static int efx_phc_adjfreq(struct ptp_clock_info *ptp, s32 delta) > +{ > + struct efx_ptp_data *ptp_data = container_of(ptp, > + struct efx_ptp_data, > + phc_clock_info); > + struct efx_nic *efx = ptp_data->channel->efx; > + u8 inadj[MC_CMD_PTP_IN_ADJUST_LEN]; > + s64 adjustment_ns; > + int rc; > + > + if (delta > MAX_PPB) > + delta = MAX_PPB; > + else if (delta < -MAX_PPB) > + delta = -MAX_PPB; > + > + /* Convert ppb to fixed point ns. */ > + adjustment_ns = (((s64)delta * PPB_SCALE_WORD) >> > + (PPB_EXTRA_BITS + MAX_PPB_BITS)); > + > + MCDI_SET_DWORD(inadj, PTP_IN_OP, MC_CMD_PTP_OP_ADJUST); > + MCDI_SET_DWORD(inadj, PTP_IN_ADJUST_FREQ_LO, (u32)adjustment_ns); > + MCDI_SET_DWORD(inadj, PTP_IN_ADJUST_FREQ_HI, > + (u32)(adjustment_ns >> 32)); > + MCDI_SET_DWORD(inadj, PTP_IN_ADJUST_SECONDS, 0); > + MCDI_SET_DWORD(inadj, PTP_IN_ADJUST_NANOSECONDS, 0); > + rc = efx_mcdi_rpc(efx, MC_CMD_PTP, inadj, sizeof(inadj), > + NULL, 0, NULL); > + if (rc != 0) > + return rc; > + > + ptp_data->current_adjfreq = delta; > + return 0; > +} > + > +static int efx_phc_adjtime(struct ptp_clock_info *ptp, s64 delta) > +{ > + struct efx_ptp_data *ptp_data = container_of(ptp, > + struct efx_ptp_data, > + phc_clock_info); > + struct efx_nic *efx = ptp_data->channel->efx; > + struct timespec delta_ts = ns_to_timespec(delta); > + u8 inbuf[MC_CMD_PTP_IN_ADJUST_LEN]; > + > + MCDI_SET_DWORD(inbuf, PTP_IN_OP, MC_CMD_PTP_OP_ADJUST); > + MCDI_SET_DWORD(inbuf, PTP_IN_ADJUST_FREQ_LO, 0); > + MCDI_SET_DWORD(inbuf, PTP_IN_ADJUST_FREQ_HI, 0); > + MCDI_SET_DWORD(inbuf, PTP_IN_ADJUST_SECONDS, (u32)delta_ts.tv_sec); > + MCDI_SET_DWORD(inbuf, PTP_IN_ADJUST_NANOSECONDS, (u32)delta_ts.tv_nsec); > + return efx_mcdi_rpc(efx, MC_CMD_PTP, inbuf, sizeof(inbuf), > + NULL, 0, NULL); > +} > + > +static int efx_phc_gettime(struct ptp_clock_info *ptp, struct timespec *ts) > +{ > + struct efx_ptp_data *ptp_data = container_of(ptp, > + struct efx_ptp_data, > + phc_clock_info); > + struct efx_nic *efx = ptp_data->channel->efx; > + u8 inbuf[MC_CMD_PTP_IN_READ_NIC_TIME_LEN]; > + u8 outbuf[MC_CMD_PTP_OUT_READ_NIC_TIME_LEN]; > + int rc; > + > + MCDI_SET_DWORD(inbuf, PTP_IN_OP, MC_CMD_PTP_OP_READ_NIC_TIME); > + > + rc = efx_mcdi_rpc(efx, MC_CMD_PTP, inbuf, sizeof(inbuf), > + outbuf, sizeof(outbuf), NULL); > + if (rc != 0) > + return rc; > + > + ts->tv_sec = MCDI_DWORD(outbuf, PTP_OUT_READ_NIC_TIME_SECONDS); > + ts->tv_nsec = MCDI_DWORD(outbuf, PTP_OUT_READ_NIC_TIME_NANOSECONDS); > + return 0; > +} > + > +static int efx_phc_settime(struct ptp_clock_info *ptp, > + const struct timespec *e_ts) > +{ > + /* We must provide this function, but we cannot actually set the time */ Huh? You can adjtime, so must be able to settime, too, right? If you have enough range in the RAW timestamp in the MC firmware (like 64 bits of nanoseconds), and you allow settime, then you can spare the system time synchronization code altogether. Thanks, Richard > + return -EOPNOTSUPP; > +} > + > +static int efx_phc_enable(struct ptp_clock_info *ptp, > + struct ptp_clock_request *request, > + int enable) > +{ > + struct efx_ptp_data *ptp_data = container_of(ptp, > + struct efx_ptp_data, > + phc_clock_info); > + if (request->type != PTP_CLK_REQ_EXTTS) > + return -EOPNOTSUPP; > + > + ptp_data->nic_ts_enabled = !!enable; > + return 0; > +} > + > +static const struct efx_channel_type efx_ptp_channel_type = { > + .handle_no_channel = efx_ptp_handle_no_channel, > + .pre_probe = efx_ptp_probe_channel, > + .post_remove = efx_ptp_remove_channel, > + .get_name = efx_ptp_get_channel_name, > + /* no copy operation; there is no need to reallocate this channel */ > + .receive_skb = efx_ptp_rx, > + .keep_eventq = false, > +}; > + > +void efx_ptp_probe(struct efx_nic *efx) > +{ > + /* Check whether PTP is implemented on this NIC. The DISABLE > + * operation will succeed if and only if it is implemented. > + */ > + if (efx_ptp_disable(efx) == 0) > + efx->extra_channel_type[EFX_EXTRA_CHANNEL_PTP] = > + &efx_ptp_channel_type; > +} > diff --git a/drivers/net/ethernet/sfc/rx.c b/drivers/net/ethernet/sfc/rx.c > index 92699a0..8923863 100644 > --- a/drivers/net/ethernet/sfc/rx.c > +++ b/drivers/net/ethernet/sfc/rx.c > @@ -573,7 +573,7 @@ static void efx_rx_deliver(struct efx_channel *channel, > /* Record the rx_queue */ > skb_record_rx_queue(skb, channel->rx_queue.core_index); > > - /* Does the channel want to handle the skb */ > + /* Pass the packet up */ > if (channel->type->receive_skb) > channel->type->receive_skb(channel, skb); > else > diff --git a/drivers/net/ethernet/sfc/siena.c b/drivers/net/ethernet/sfc/siena.c > index 6bafd21..84b41bf 100644 > --- a/drivers/net/ethernet/sfc/siena.c > +++ b/drivers/net/ethernet/sfc/siena.c > @@ -335,6 +335,7 @@ static int siena_probe_nic(struct efx_nic *efx) > goto fail5; > > efx_sriov_probe(efx); > + efx_ptp_probe(efx); > > return 0; > > diff --git a/drivers/net/ethernet/sfc/tx.c b/drivers/net/ethernet/sfc/tx.c > index 9b225a7..66badf8 100644 > --- a/drivers/net/ethernet/sfc/tx.c > +++ b/drivers/net/ethernet/sfc/tx.c > @@ -347,6 +347,12 @@ netdev_tx_t efx_hard_start_xmit(struct sk_buff *skb, > > EFX_WARN_ON_PARANOID(!netif_device_present(net_dev)); > > + /* PTP "event" packet */ > + if (unlikely(efx_xmit_with_hwtstamp(skb)) && > + unlikely(efx_ptp_is_ptp_tx(efx, skb))) { > + return efx_ptp_tx(efx, skb); > + } > + > index = skb_get_queue_mapping(skb); > type = skb->ip_summed == CHECKSUM_PARTIAL ? EFX_TXQ_TYPE_OFFLOAD : 0; > if (index >= efx->n_tx_channels) { > -- > 1.7.7.6 > > > > -- > Ben Hutchings, Staff Engineer, Solarflare > Not speaking for my employer; that's the marketing department's job. > They asked us to note that Solarflare product names are trademarked. > ^ permalink raw reply [flat|nested] 23+ messages in thread
* Re: [PATCH net-next 4/7] sfc: Add support for IEEE-1588 PTP 2012-07-19 14:25 ` Richard Cochran @ 2012-07-19 14:37 ` Ben Hutchings 2012-07-19 16:05 ` Andrew Jackson 2012-07-19 15:29 ` Stuart Hodgson 1 sibling, 1 reply; 23+ messages in thread From: Ben Hutchings @ 2012-07-19 14:37 UTC (permalink / raw) To: Richard Cochran, Andrew Jackson; +Cc: David Miller, netdev, linux-net-drivers On Thu, 2012-07-19 at 16:25 +0200, Richard Cochran wrote: > On Wed, Jul 18, 2012 at 07:21:33PM +0100, Ben Hutchings wrote: > > Add PTP IEEE-1588 support and make accesible via the PHC subsystem. > > > > This work is based on prior code by Andrew Jackson > > > > Signed-off-by: Stuart Hodgson <smhodgson@solarflare.com> > > Signed-off-by: Ben Hutchings <bhutchings@solarflare.com> [...] > > --- a/drivers/net/ethernet/sfc/nic.h > > +++ b/drivers/net/ethernet/sfc/nic.h > > @@ -250,6 +250,37 @@ extern int efx_sriov_get_vf_config(struct net_device *dev, int vf, > > extern int efx_sriov_set_vf_spoofchk(struct net_device *net_dev, int vf, > > bool spoofchk); > > > > +struct ethtool_ts_info; > > +#ifdef CONFIG_SFC_PTP > > +extern void efx_ptp_probe(struct efx_nic *efx); > > +extern int efx_ptp_ioctl(struct efx_nic *efx, struct ifreq *ifr, int cmd); > > +extern int efx_ptp_get_ts_info(struct net_device *net_dev, > > + struct ethtool_ts_info *ts_info); > > +extern bool efx_ptp_is_ptp_tx(struct efx_nic *efx, struct sk_buff *skb); > > +extern int efx_ptp_tx(struct efx_nic *efx, struct sk_buff *skb); > > +extern void efx_ptp_event(struct efx_nic *efx, efx_qword_t *ev); > > +#else > > +static inline void efx_ptp_probe(struct efx_nic *efx) {} > > +static inline int efx_ptp_ioctl(struct efx_nic *efx, struct ifreq *ifr, int cmd) > > +{ > > + return -EOPNOTSUPP; > > +} > > +static inline int efx_ptp_get_ts_info(struct net_device *net_dev, > > + struct ethtool_ts_info *ts_info) > > +{ > > + return -EOPNOTSUPP; > > If your PTP support is not enabled, then it would be better to offer > the standard ethtool answer to this query. > > Also, it would be nice to still offer SW Tx timestamping, even when > PTP is disabled. Yes, I'm aware we should do that, but I also want to resolve the feature gap between in-tree and out-of-tree versions first. [...] > > +/* Process times received from MC. > > + * > > + * Extract times from returned results, and establish the minimum value > > + * seen. The minimum value represents the "best" possible time and events > > + * too much greater than this are rejected - the machine is, perhaps, too > > + * busy. A number of readings are taken so that, hopefully, at least one good > > + * synchronisation will be seen in the results. > > + */ > > This code looks like it is trying to find the offset between two > clocks. Is there some reason why you cannot use <linux/timecompare.h> > to accomplish this? > > Also, these comments about "hopefull" synchronization make me > nervous. I think it might be easier just to offer RAW timestamps and > forget about the SYS timestamps. > > I am trying to purge the whole SYS thing (only blackfin is left) > because there is a much better way to go about this, namely > synchronizing the system time to the PHC time via an internal PPS > signal. Andrew, would that work for us? [...] > > +static int efx_phc_settime(struct ptp_clock_info *ptp, > > + const struct timespec *e_ts) > > +{ > > + /* We must provide this function, but we cannot actually set the time */ > > Huh? You can adjtime, so must be able to settime, too, right? Unless I missed something, the firmware interface doesn't include an atomic settime operation. We may be able to fudge it with gettime and adjtime, if that's good enough. > If you have enough range in the RAW timestamp in the MC firmware (like > 64 bits of nanoseconds), and you allow settime, then you can spare the > system time synchronization code altogether. [...] Ben. -- Ben Hutchings, Staff Engineer, Solarflare Not speaking for my employer; that's the marketing department's job. They asked us to note that Solarflare product names are trademarked. ^ permalink raw reply [flat|nested] 23+ messages in thread
* Re: [PATCH net-next 4/7] sfc: Add support for IEEE-1588 PTP 2012-07-19 14:37 ` Ben Hutchings @ 2012-07-19 16:05 ` Andrew Jackson 2012-07-20 6:11 ` Richard Cochran 0 siblings, 1 reply; 23+ messages in thread From: Andrew Jackson @ 2012-07-19 16:05 UTC (permalink / raw) To: Ben Hutchings; +Cc: Richard Cochran, David Miller, netdev, linux-net-drivers On 19/07/2012 15:37, Ben Hutchings wrote: > On Thu, 2012-07-19 at 16:25 +0200, Richard Cochran wrote: >> On Wed, Jul 18, 2012 at 07:21:33PM +0100, Ben Hutchings wrote: >>> +/* Process times received from MC. >>> + * >>> + * Extract times from returned results, and establish the minimum value >>> + * seen. The minimum value represents the "best" possible time and events >>> + * too much greater than this are rejected - the machine is, perhaps, too >>> + * busy. A number of readings are taken so that, hopefully, at least one good >>> + * synchronisation will be seen in the results. >>> + */ >> >> This code looks like it is trying to find the offset between two >> clocks. Is there some reason why you cannot use <linux/timecompare.h> >> to accomplish this? >> >> Also, these comments about "hopefull" synchronization make me >> nervous. I think it might be easier just to offer RAW timestamps and >> forget about the SYS timestamps. >> >> I am trying to purge the whole SYS thing (only blackfin is left) >> because there is a much better way to go about this, namely >> synchronizing the system time to the PHC time via an internal PPS >> signal. > > Andrew, would that work for us? I don't think so for the reason that Stu has pointed out (failed assumption). The NIC's clock isn't directly accessible by the host from the PCIe bus and is "behind" the MC. Even when we process PPS events, we need a reliable way of determining the relationship between the two clocks (system <> NIC). We're trying to get that as accurately as we can but we know that some measurements will be incorrect/out of bounds because of loading on the system. In retrospect, I should have phrased the comment in more statistical terms rather than using ambiguous phrases like "hopefully". Andrew ^ permalink raw reply [flat|nested] 23+ messages in thread
* Re: [PATCH net-next 4/7] sfc: Add support for IEEE-1588 PTP 2012-07-19 16:05 ` Andrew Jackson @ 2012-07-20 6:11 ` Richard Cochran 0 siblings, 0 replies; 23+ messages in thread From: Richard Cochran @ 2012-07-20 6:11 UTC (permalink / raw) To: Andrew Jackson; +Cc: Ben Hutchings, David Miller, netdev, linux-net-drivers On Thu, Jul 19, 2012 at 05:05:45PM +0100, Andrew Jackson wrote: > On 19/07/2012 15:37, Ben Hutchings wrote: > >On Thu, 2012-07-19 at 16:25 +0200, Richard Cochran wrote: > >> > >>I am trying to purge the whole SYS thing (only blackfin is left) > >>because there is a much better way to go about this, namely > >>synchronizing the system time to the PHC time via an internal PPS > >>signal. > > > >Andrew, would that work for us? > > I don't think so for the reason that Stu has pointed out (failed > assumption). > > The NIC's clock isn't directly accessible by the host from the PCIe > bus and is "behind" the MC. Even when we process PPS events, we need > a reliable way of determining the relationship between the two > clocks (system <> NIC). We're trying to get that as accurately as we > can but we know that some measurements will be incorrect/out of > bounds because of loading on the system. There is a better way to filter out bad measurements than to hard code some black magic into the driver. Instead, just offer a PPS, and then we can comfortably (and flexibly) filter using a user space program. Thanks, Richard ^ permalink raw reply [flat|nested] 23+ messages in thread
* Re: [PATCH net-next 4/7] sfc: Add support for IEEE-1588 PTP 2012-07-19 14:25 ` Richard Cochran 2012-07-19 14:37 ` Ben Hutchings @ 2012-07-19 15:29 ` Stuart Hodgson 2012-07-19 15:43 ` David Miller ` (2 more replies) 1 sibling, 3 replies; 23+ messages in thread From: Stuart Hodgson @ 2012-07-19 15:29 UTC (permalink / raw) To: Richard Cochran Cc: Ben Hutchings, David Miller, netdev, linux-net-drivers, Andrew Jackson On 19/07/12 15:25, Richard Cochran wrote: > On Wed, Jul 18, 2012 at 07:21:33PM +0100, Ben Hutchings wrote: >> Add PTP IEEE-1588 support and make accesible via the PHC subsystem. >> >> This work is based on prior code by Andrew Jackson >> >> Signed-off-by: Stuart Hodgson <smhodgson@solarflare.com> >> Signed-off-by: Ben Hutchings <bhutchings@solarflare.com> >> --- >> drivers/net/ethernet/sfc/Kconfig | 7 + >> drivers/net/ethernet/sfc/Makefile | 1 + >> drivers/net/ethernet/sfc/efx.c | 3 + >> drivers/net/ethernet/sfc/ethtool.c | 1 + >> drivers/net/ethernet/sfc/mcdi_pcol.h | 1 + >> drivers/net/ethernet/sfc/net_driver.h | 19 +- >> drivers/net/ethernet/sfc/nic.h | 31 + >> drivers/net/ethernet/sfc/ptp.c | 1519 +++++++++++++++++++++++++++++++++ >> drivers/net/ethernet/sfc/rx.c | 2 +- >> drivers/net/ethernet/sfc/siena.c | 1 + >> drivers/net/ethernet/sfc/tx.c | 6 + >> 11 files changed, 1589 insertions(+), 2 deletions(-) >> create mode 100644 drivers/net/ethernet/sfc/ptp.c >> >> diff --git a/drivers/net/ethernet/sfc/Kconfig b/drivers/net/ethernet/sfc/Kconfig >> index fb3cbc2..78c5d435 100644 >> --- a/drivers/net/ethernet/sfc/Kconfig >> +++ b/drivers/net/ethernet/sfc/Kconfig >> @@ -34,3 +34,10 @@ config SFC_SRIOV >> This enables support for the SFC9000 I/O Virtualization >> features, allowing accelerated network performance in >> virtualized environments. >> +config SFC_PTP >> + bool "Solarflare SFC9000-family PTP support" >> + depends on SFC && PTP_1588_CLOCK >> + default y >> + ---help--- >> + This enables support for the Precision Time Protocol (PTP) >> + on SFC9000-family NICs >> diff --git a/drivers/net/ethernet/sfc/Makefile b/drivers/net/ethernet/sfc/Makefile >> index ea1f8db..e11f2ec 100644 >> --- a/drivers/net/ethernet/sfc/Makefile >> +++ b/drivers/net/ethernet/sfc/Makefile >> @@ -5,5 +5,6 @@ sfc-y += efx.o nic.o falcon.o siena.o tx.o rx.o filter.o \ >> mcdi.o mcdi_phy.o mcdi_mon.o >> sfc-$(CONFIG_SFC_MTD) += mtd.o >> sfc-$(CONFIG_SFC_SRIOV) += siena_sriov.o >> +sfc-$(CONFIG_SFC_PTP) += ptp.o >> >> obj-$(CONFIG_SFC) += sfc.o >> diff --git a/drivers/net/ethernet/sfc/efx.c b/drivers/net/ethernet/sfc/efx.c >> index 1c53d4b..e6631f0e 100644 >> --- a/drivers/net/ethernet/sfc/efx.c >> +++ b/drivers/net/ethernet/sfc/efx.c >> @@ -1748,6 +1748,9 @@ static int efx_ioctl(struct net_device *net_dev, struct ifreq *ifr, int cmd) >> >> EFX_ASSERT_RESET_SERIALISED(efx); >> >> + if (cmd == SIOCSHWTSTAMP) >> + return efx_ptp_ioctl(efx, ifr, cmd); >> + >> /* Convert phy_id from older PRTAD/DEVAD format */ >> if ((cmd == SIOCGMIIREG || cmd == SIOCSMIIREG) && >> (data->phy_id & 0xfc00) == 0x0400) >> diff --git a/drivers/net/ethernet/sfc/ethtool.c b/drivers/net/ethernet/sfc/ethtool.c >> index 10536f9..50cdd39 100644 >> --- a/drivers/net/ethernet/sfc/ethtool.c >> +++ b/drivers/net/ethernet/sfc/ethtool.c >> @@ -1170,6 +1170,7 @@ const struct ethtool_ops efx_ethtool_ops = { >> .get_rxfh_indir_size = efx_ethtool_get_rxfh_indir_size, >> .get_rxfh_indir = efx_ethtool_get_rxfh_indir, >> .set_rxfh_indir = efx_ethtool_set_rxfh_indir, >> + .get_ts_info = efx_ptp_get_ts_info, >> .get_module_info = efx_ethtool_get_module_info, >> .get_module_eeprom = efx_ethtool_get_module_eeprom, >> }; >> diff --git a/drivers/net/ethernet/sfc/mcdi_pcol.h b/drivers/net/ethernet/sfc/mcdi_pcol.h >> index 0310b9f0..0017f98 100644 >> --- a/drivers/net/ethernet/sfc/mcdi_pcol.h >> +++ b/drivers/net/ethernet/sfc/mcdi_pcol.h >> @@ -290,6 +290,7 @@ >> #define MCDI_EVENT_CODE_TX_FLUSH 0xc /* enum */ >> #define MCDI_EVENT_CODE_PTP_RX 0xd /* enum */ >> #define MCDI_EVENT_CODE_PTP_FAULT 0xe /* enum */ >> +#define MCDI_EVENT_CODE_PTP_PPS 0xf /* enum */ >> #define MCDI_EVENT_CMDDONE_DATA_OFST 0 >> #define MCDI_EVENT_CMDDONE_DATA_LBN 0 >> #define MCDI_EVENT_CMDDONE_DATA_WIDTH 32 >> diff --git a/drivers/net/ethernet/sfc/net_driver.h b/drivers/net/ethernet/sfc/net_driver.h >> index 9913e32..f84a5d5 100644 >> --- a/drivers/net/ethernet/sfc/net_driver.h >> +++ b/drivers/net/ethernet/sfc/net_driver.h >> @@ -56,7 +56,8 @@ >> #define EFX_MAX_CHANNELS 32U >> #define EFX_MAX_RX_QUEUES EFX_MAX_CHANNELS >> #define EFX_EXTRA_CHANNEL_IOV 0 >> -#define EFX_MAX_EXTRA_CHANNELS 1U >> +#define EFX_EXTRA_CHANNEL_PTP 1 >> +#define EFX_MAX_EXTRA_CHANNELS 2U >> >> /* Checksum generation is a per-queue option in hardware, so each >> * queue visible to the networking core is backed by two hardware TX >> @@ -68,6 +69,9 @@ >> #define EFX_TXQ_TYPES 4 >> #define EFX_MAX_TX_QUEUES (EFX_TXQ_TYPES * EFX_MAX_CHANNELS) >> >> +/* Forward declare Precision Time Protocol (PTP) support structure. */ >> +struct efx_ptp_data; >> + >> struct efx_self_tests; >> >> /** >> @@ -736,6 +740,7 @@ struct vfdi_status; >> * %local_addr_list. Protected by %local_lock. >> * @local_lock: Mutex protecting %local_addr_list and %local_page_list. >> * @peer_work: Work item to broadcast peer addresses to VMs. >> + * @ptp_data: PTP state data >> * @monitor_work: Hardware monitor workitem >> * @biu_lock: BIU (bus interface unit) lock >> * @last_irq_cpu: Last CPU to handle a possible test interrupt. This >> @@ -860,6 +865,10 @@ struct efx_nic { >> struct work_struct peer_work; >> #endif >> >> +#ifdef CONFIG_SFC_PTP >> + struct efx_ptp_data *ptp_data; >> +#endif >> + >> /* The following fields may be written more often */ >> >> struct delayed_work monitor_work ____cacheline_aligned_in_smp; >> @@ -1122,5 +1131,13 @@ static inline void clear_bit_le(unsigned nr, unsigned char *addr) >> #define EFX_MAX_FRAME_LEN(mtu) \ >> ((((mtu) + ETH_HLEN + VLAN_HLEN + 4/* FCS */ + 7) & ~7) + 16) >> >> +static inline bool efx_xmit_with_hwtstamp(struct sk_buff *skb) >> +{ >> + return skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP; >> +} >> +static inline void efx_xmit_hwtstamp_pending(struct sk_buff *skb) >> +{ >> + skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS; >> +} >> >> #endif /* EFX_NET_DRIVER_H */ >> diff --git a/drivers/net/ethernet/sfc/nic.h b/drivers/net/ethernet/sfc/nic.h >> index bab5cd9..cd53ab5 100644 >> --- a/drivers/net/ethernet/sfc/nic.h >> +++ b/drivers/net/ethernet/sfc/nic.h >> @@ -250,6 +250,37 @@ extern int efx_sriov_get_vf_config(struct net_device *dev, int vf, >> extern int efx_sriov_set_vf_spoofchk(struct net_device *net_dev, int vf, >> bool spoofchk); >> >> +struct ethtool_ts_info; >> +#ifdef CONFIG_SFC_PTP >> +extern void efx_ptp_probe(struct efx_nic *efx); >> +extern int efx_ptp_ioctl(struct efx_nic *efx, struct ifreq *ifr, int cmd); >> +extern int efx_ptp_get_ts_info(struct net_device *net_dev, >> + struct ethtool_ts_info *ts_info); >> +extern bool efx_ptp_is_ptp_tx(struct efx_nic *efx, struct sk_buff *skb); >> +extern int efx_ptp_tx(struct efx_nic *efx, struct sk_buff *skb); >> +extern void efx_ptp_event(struct efx_nic *efx, efx_qword_t *ev); >> +#else >> +static inline void efx_ptp_probe(struct efx_nic *efx) {} >> +static inline int efx_ptp_ioctl(struct efx_nic *efx, struct ifreq *ifr, int cmd) >> +{ >> + return -EOPNOTSUPP; >> +} >> +static inline int efx_ptp_get_ts_info(struct net_device *net_dev, >> + struct ethtool_ts_info *ts_info) >> +{ >> + return -EOPNOTSUPP; > > If your PTP support is not enabled, then it would be better to offer > the standard ethtool answer to this query. > > Also, it would be nice to still offer SW Tx timestamping, even when > PTP is disabled. > >> +} >> +static inline bool efx_ptp_is_ptp_tx(struct efx_nic *efx, struct sk_buff *skb) >> +{ >> + return false; >> +} >> +static inline int efx_ptp_tx(struct efx_nic *efx, struct sk_buff *skb) >> +{ >> + return NETDEV_TX_OK; >> +} >> +static inline void efx_ptp_event(struct efx_nic *efx, efx_qword_t *ev) {} >> +#endif >> + >> extern const struct efx_nic_type falcon_a1_nic_type; >> extern const struct efx_nic_type falcon_b0_nic_type; >> extern const struct efx_nic_type siena_a0_nic_type; >> diff --git a/drivers/net/ethernet/sfc/ptp.c b/drivers/net/ethernet/sfc/ptp.c >> new file mode 100644 >> index 0000000..ba1e76a >> --- /dev/null >> +++ b/drivers/net/ethernet/sfc/ptp.c >> @@ -0,0 +1,1519 @@ >> +/**************************************************************************** >> + * Driver for Solarflare Solarstorm network controllers and boards >> + * Copyright 2011 Solarflare Communications Inc. >> + * >> + * This program is free software; you can redistribute it and/or modify it >> + * under the terms of the GNU General Public License version 2 as published >> + * by the Free Software Foundation, incorporated herein by reference. >> + */ >> + >> +/* Theory of operation: >> + * >> + * PTP support is assisted by firmware running on the MC, which provides >> + * the hardware timestamping capabilities. Both transmitted and received >> + * PTP event packets are queued onto internal queues for subsequent processing; >> + * this is because the MC operations are relatively long and would block >> + * block NAPI/interrupt operation. >> + * >> + * Receive event processing: >> + * The event contains the packet's UUID and sequence number, together >> + * with the hardware timestamp. The PTP receive packet queue is searched >> + * for this UUID/sequence number and, if found, put on a pending queue. >> + * Packets not matching are delivered without timestamps (MCDI events will >> + * always arrive after the actual packet). >> + * It is important for the operation of the PTP protocol that the ordering >> + * of packets between the event and general port is maintained. >> + * >> + * Work queue processing: >> + * If work waiting, synchronise host/hardware time >> + * >> + * Transmit: send packet through MC, which returns the transmission time >> + * that is converted to an appropriate timestamp. >> + * >> + * Receive: the packet's reception time is converted to an appropriate >> + * timestamp. >> + */ >> +#include <linux/ip.h> >> +#include <linux/udp.h> >> +#include <linux/time.h> >> +#include <linux/ktime.h> >> +#include <linux/module.h> >> +#include <linux/net_tstamp.h> >> +#include <linux/ptp_clock_kernel.h> >> +#include "net_driver.h" >> +#include "efx.h" >> +#include "mcdi.h" >> +#include "mcdi_pcol.h" >> +#include "io.h" >> +#include "regs.h" >> +#include "nic.h" >> + >> +/* Maximum number of events expected to make up a PTP event */ >> +#define MAX_EVENT_FRAGS 3 >> + >> +/* Maximum delay, ms, to begin synchronisation */ >> +#define MAX_SYNCHRONISE_WAIT_MS 2 >> + >> +/* How long, at most, to spend synchronising */ >> +#define SYNCHRONISE_PERIOD_NS 250000 >> + >> +/* How often to update the shared memory time */ >> +#define SYNCHRONISATION_GRANULARITY_NS 200 >> + >> +/* Minimum permitted length of a (corrected) synchronisation time */ >> +#define MIN_SYNCHRONISATION_NS 120 >> + >> +/* Maximum permitted length of a (corrected) synchronisation time */ >> +#define MAX_SYNCHRONISATION_NS 1000 >> + >> +/* How many (MC) receive events that can be queued */ >> +#define MAX_RECEIVE_EVENTS 8 >> + >> +/* Length of (modified) moving average. */ >> +#define AVERAGE_LENGTH 16 >> + >> +/* How long an unmatched event or packet can be held */ >> +#define PKT_EVENT_LIFETIME_MS 10 >> + >> +/* Offsets into PTP packet for identification. These offsets are from the >> + * start of the IP header, not the MAC header. Note that neither PTP V1 nor >> + * PTP V2 permit the use of IPV4 options. >> + */ >> +#define PTP_DPORT_OFFSET 22 >> + >> +#define PTP_V1_VERSION_LENGTH 2 >> +#define PTP_V1_VERSION_OFFSET 28 >> + >> +#define PTP_V1_UUID_LENGTH 6 >> +#define PTP_V1_UUID_OFFSET 50 >> + >> +#define PTP_V1_SEQUENCE_LENGTH 2 >> +#define PTP_V1_SEQUENCE_OFFSET 58 >> + >> +/* The minimum length of a PTP V1 packet for offsets, etc. to be valid: >> + * includes IP header. >> + */ >> +#define PTP_V1_MIN_LENGTH 64 >> + >> +#define PTP_V2_VERSION_LENGTH 1 >> +#define PTP_V2_VERSION_OFFSET 29 >> + >> +/* Although PTP V2 UUIDs are comprised a ClockIdentity (8) and PortNumber (2), >> + * the MC only captures the last six bytes of the clock identity. These values >> + * reflect those, not the ones used in the standard. The standard permits >> + * mapping of V1 UUIDs to V2 UUIDs with these same values. >> + */ >> +#define PTP_V2_MC_UUID_LENGTH 6 >> +#define PTP_V2_MC_UUID_OFFSET 50 >> + >> +#define PTP_V2_SEQUENCE_LENGTH 2 >> +#define PTP_V2_SEQUENCE_OFFSET 58 >> + >> +/* The minimum length of a PTP V2 packet for offsets, etc. to be valid: >> + * includes IP header. >> + */ >> +#define PTP_V2_MIN_LENGTH 63 >> + >> +#define PTP_MIN_LENGTH 63 >> + >> +#define PTP_ADDRESS 0xe0000181 /* 224.0.1.129 */ >> +#define PTP_EVENT_PORT 319 >> +#define PTP_GENERAL_PORT 320 >> + >> +/* Annoyingly the format of the version numbers are different between >> + * versions 1 and 2 so it isn't possible to simply look for 1 or 2. >> + */ >> +#define PTP_VERSION_V1 1 >> + >> +#define PTP_VERSION_V2 2 >> +#define PTP_VERSION_V2_MASK 0x0f >> + >> +enum ptp_packet_state { >> + PTP_PACKET_STATE_UNMATCHED = 0, >> + PTP_PACKET_STATE_MATCHED, >> + PTP_PACKET_STATE_TIMED_OUT, >> + PTP_PACKET_STATE_MATCH_UNWANTED >> +}; >> + >> +/* NIC synchronised with single word of time only comprising >> + * partial seconds and full nanoseconds: 10^9 ~ 2^30 so 2 bits for seconds. >> + */ >> +#define MC_NANOSECOND_BITS 30 >> +#define MC_NANOSECOND_MASK ((1 << MC_NANOSECOND_BITS) - 1) >> +#define MC_SECOND_MASK ((1 << (32 - MC_NANOSECOND_BITS)) - 1) >> + >> +/* Maximum parts-per-billion adjustment that is acceptable */ >> +#define MAX_PPB 1000000 >> + >> +/* Number of bits required to hold the above */ >> +#define MAX_PPB_BITS 20 >> + >> +/* Number of extra bits allowed when calculating fractional ns. >> + * EXTRA_BITS + MC_CMD_PTP_IN_ADJUST_BITS + MAX_PPB_BITS should >> + * be less than 63. >> + */ >> +#define PPB_EXTRA_BITS 2 >> + >> +/* Precalculate scale word to avoid long long division at runtime */ >> +#define PPB_SCALE_WORD ((1LL << (PPB_EXTRA_BITS + MC_CMD_PTP_IN_ADJUST_BITS +\ >> + MAX_PPB_BITS)) / 1000000000LL) >> + >> +#define PTP_SYNC_ATTEMPTS 4 >> + >> +/** >> + * struct efx_ptp_match - Matching structure, stored in sk_buff's cb area. >> + * @words: UUID and (partial) sequence number >> + * @expiry: Time after which the packet should be delivered irrespective of >> + * event arrival. >> + * @state: The state of the packet - whether it is ready for processing or >> + * whether that is of no interest. >> + */ >> +struct efx_ptp_match { >> + u32 words[DIV_ROUND_UP(PTP_V1_UUID_LENGTH, 4)]; >> + unsigned long expiry; >> + enum ptp_packet_state state; >> +}; >> + >> +/** >> + * struct efx_ptp_event_rx - A PTP receive event (from MC) >> + * @seq0: First part of (PTP) UUID >> + * @seq1: Second part of (PTP) UUID and sequence number >> + * @hwtimestamp: Event timestamp >> + */ >> +struct efx_ptp_event_rx { >> + struct list_head link; >> + u32 seq0; >> + u32 seq1; >> + ktime_t hwtimestamp; >> + unsigned long expiry; >> +}; >> + >> +/** >> + * struct efx_ptp_timeset - Synchronisation between host and MC >> + * @host_start: Host time immediately before hardware timestamp taken >> + * @seconds: Hardware timestamp, seconds >> + * @nanoseconds: Hardware timestamp, nanoseconds >> + * @host_end: Host time immediately after hardware timestamp taken >> + * @waitns: Number of nanoseconds between hardware timestamp being read and >> + * host end time being seen >> + * @window: Difference of host_end and host_start >> + * @valid: Whether this timeset is valid >> + */ >> +struct efx_ptp_timeset { >> + u32 host_start; >> + u32 seconds; >> + u32 nanoseconds; >> + u32 host_end; >> + u32 waitns; >> + u32 window; /* Derived: end - start, allowing for wrap */ >> +}; >> + >> +/** >> + * struct efx_ptp_data - Precision Time Protocol (PTP) state >> + * @channel: The PTP channel >> + * @rxq: Receive queue (awaiting timestamps) >> + * @txq: Transmit queue >> + * @evt_list: List of MC receive events awaiting packets >> + * @evt_free_list: List of free events >> + * @evt_lock: Lock for manipulating evt_list and evt_free_list >> + * @rx_evts: Instantiated events (on evt_list and evt_free_list) >> + * @workwq: Work queue for processing pending PTP operations >> + * @work: Work task >> + * @reset_required: A serious error has occurred and the PTP task needs to be >> + * reset (disable, enable). >> + * @rxfilter_event: Receive filter when operating >> + * @rxfilter_general: Receive filter when operating >> + * @config: Current timestamp configuration >> + * @enabled: PTP operation enabled >> + * @mode: Mode in which PTP operating (PTP version) >> + * @evt_frags: Partly assembled PTP events >> + * @evt_frag_idx: Current fragment number >> + * @evt_code: Last event code >> + * @start: Address at which MC indicates ready for synchronisation >> + * @host_base_time: (Synchronised with mc_base_time) host time >> + * @mc_base_time: (Synchronised with host_base_time) MC/hardware time >> + * @base_time_valid: Whether host_base_time and mc_base_time are synchronised >> + * @last_sync_ns: Last number of nanoseconds between readings when synchronising >> + * @base_sync_ns: Number of nanoseconds for last synchronisation. >> + * @base_sync_valid: Whether base_sync_time is valid. >> + * @current_adjfreq: Current ppb adjustment. >> + * @phc_clock: Pointer to registered phc device >> + * @phc_clock_info: Registration structure for phc device >> + * @pps_work: pps work task for handling pps events >> + * @pps_workwq: pps work queue >> + * @nic_ts_enabled: Flag indicating if NIC generated TS events are handled >> + * @txbuf: Buffer for use when transmitting (PTP) packets to MC (avoids >> + * allocations in main data path). >> + * @debug_ptp_dir: PTP debugfs directory >> + * @missed_rx_sync: Number of packets received without syncrhonisation. >> + * @good_syncs: Number of successful synchronisations. >> + * @no_time_syncs: Number of synchronisations with no good times. >> + * @bad_sync_durations: Number of synchronisations with bad durations. >> + * @bad_syncs: Number of failed synchronisations. >> + * @last_sync_time: Number of nanoseconds for last synchronisation. >> + * @sync_timeouts: Number of synchronisation timeouts >> + * @fast_syncs: Number of synchronisations requiring short delay >> + * @min_sync_delta: Minimum time between event and synchronisation >> + * @max_sync_delta: Maximum time between event and synchronisation >> + * @average_sync_delta: Average time between event and synchronisation. >> + * Modified moving average. >> + * @last_sync_delta: Last time between event and synchronisation >> + * @mc_stats: Context value for MC statistics >> + * @timeset: Last set of synchronisation statistics. >> + */ >> +struct efx_ptp_data { >> + struct efx_channel *channel; >> + struct sk_buff_head rxq; >> + struct sk_buff_head txq; >> + struct list_head evt_list; >> + struct list_head evt_free_list; >> + spinlock_t evt_lock; >> + struct efx_ptp_event_rx rx_evts[MAX_RECEIVE_EVENTS]; >> + struct workqueue_struct *workwq; >> + struct work_struct work; >> + bool reset_required; >> + u32 rxfilter_event; >> + u32 rxfilter_general; >> + bool rxfilter_installed; >> + struct hwtstamp_config config; >> + bool enabled; >> + unsigned int mode; >> + efx_qword_t evt_frags[MAX_EVENT_FRAGS]; >> + int evt_frag_idx; >> + int evt_code; >> + struct efx_buffer start; >> + ktime_t host_base_time; >> + ktime_t mc_base_time; >> + bool base_time_valid; >> + unsigned last_sync_ns; >> + unsigned base_sync_ns; >> + bool base_sync_valid; >> + s64 current_adjfreq; >> + struct ptp_clock *phc_clock; >> + struct ptp_clock_info phc_clock_info; >> + struct work_struct pps_work; >> + struct workqueue_struct *pps_workwq; >> + bool nic_ts_enabled; >> + u8 txbuf[ALIGN(MC_CMD_PTP_IN_TRANSMIT_LEN( >> + MC_CMD_PTP_IN_TRANSMIT_PACKET_MAXNUM), 4)]; >> + struct efx_ptp_timeset >> + timeset[MC_CMD_PTP_OUT_SYNCHRONIZE_TIMESET_MAXNUM]; >> +}; >> + >> +static int efx_phc_adjfreq(struct ptp_clock_info *ptp, s32 delta); >> +static int efx_phc_adjtime(struct ptp_clock_info *ptp, s64 delta); >> +static int efx_phc_gettime(struct ptp_clock_info *ptp, struct timespec *ts); >> +static int efx_phc_settime(struct ptp_clock_info *ptp, >> + const struct timespec *e_ts); >> +static int efx_phc_enable(struct ptp_clock_info *ptp, >> + struct ptp_clock_request *request, int on); >> + >> +/* Enable MCDI PTP support. */ >> +static int efx_ptp_enable(struct efx_nic *efx) >> +{ >> + u8 inbuf[MC_CMD_PTP_IN_ENABLE_LEN]; >> + >> + MCDI_SET_DWORD(inbuf, PTP_IN_OP, MC_CMD_PTP_OP_ENABLE); >> + MCDI_SET_DWORD(inbuf, PTP_IN_ENABLE_QUEUE, >> + efx->ptp_data->channel->channel); >> + MCDI_SET_DWORD(inbuf, PTP_IN_ENABLE_MODE, efx->ptp_data->mode); >> + >> + return efx_mcdi_rpc(efx, MC_CMD_PTP, inbuf, sizeof(inbuf), >> + NULL, 0, NULL); >> +} >> + >> +/* Disable MCDI PTP support. >> + * >> + * Note that this function should never rely on the presence of ptp_data - >> + * may be called before that exists. >> + */ >> +static int efx_ptp_disable(struct efx_nic *efx) >> +{ >> + u8 inbuf[MC_CMD_PTP_IN_DISABLE_LEN]; >> + >> + MCDI_SET_DWORD(inbuf, PTP_IN_OP, MC_CMD_PTP_OP_DISABLE); >> + return efx_mcdi_rpc(efx, MC_CMD_PTP, inbuf, sizeof(inbuf), >> + NULL, 0, NULL); >> +} >> + >> +static void efx_ptp_deliver_rx_queue(struct sk_buff_head *q) >> +{ >> + struct sk_buff *skb; >> + >> + while ((skb = skb_dequeue(q))) { >> + local_bh_disable(); >> + netif_receive_skb(skb); >> + local_bh_enable(); >> + } >> +} >> + >> +static void efx_ptp_handle_no_channel(struct efx_nic *efx) >> +{ >> + netif_err(efx, drv, efx->net_dev, >> + "ERROR: PTP requires MSI-X and 1 additional interrupt" >> + "vector. PTP disabled\n"); >> +} >> + >> +/* Repeatedly send the host time to the MC which will capture the hardware >> + * time. >> + */ >> +static void efx_ptp_send_times(struct efx_nic *efx, struct timespec *last_time) >> +{ >> + struct timespec now; >> + struct timespec limit; >> + struct efx_ptp_data *ptp = efx->ptp_data; >> + struct timespec start; >> + int *mc_running = ptp->start.addr; >> + >> + getnstimeofday(&now); >> + start = now; >> + limit = now; >> + timespec_add_ns(&limit, SYNCHRONISE_PERIOD_NS); >> + >> + /* Write host time for specified period or until MC is done */ >> + while ((timespec_compare(&now, &limit) < 0) && >> + ACCESS_ONCE(*mc_running)) { >> + struct timespec update_time; >> + unsigned int host_time; >> + >> + /* Don't update continuously to avoid saturating the PCIe bus */ >> + update_time = now; >> + timespec_add_ns(&update_time, SYNCHRONISATION_GRANULARITY_NS); >> + do { >> + getnstimeofday(&now); >> + } while ((timespec_compare(&now, &update_time) < 0) && >> + ACCESS_ONCE(*mc_running)); >> + >> + /* Synchronise NIC with single word of time only */ >> + host_time = (now.tv_sec << MC_NANOSECOND_BITS) | now.tv_nsec; >> + /* Update host time in NIC memory */ >> + _efx_writed(efx, host_time, >> + FR_CZ_MC_TREG_SMEM + MC_SMEM_P0_PTP_TIME_OFST); >> + } >> + *last_time = now; >> + start = timespec_sub(now, start); >> +} >> + >> +/* Read a timeset from the MC's results and partial process. */ >> +static void efx_ptp_read_timeset(u8 *data, struct efx_ptp_timeset *timeset) >> +{ >> + unsigned start_ns, end_ns; >> + >> + timeset->host_start = MCDI_DWORD(data, PTP_OUT_SYNCHRONIZE_HOSTSTART); >> + timeset->seconds = MCDI_DWORD(data, PTP_OUT_SYNCHRONIZE_SECONDS); >> + timeset->nanoseconds = MCDI_DWORD(data, >> + PTP_OUT_SYNCHRONIZE_NANOSECONDS); >> + timeset->host_end = MCDI_DWORD(data, PTP_OUT_SYNCHRONIZE_HOSTEND), >> + timeset->waitns = MCDI_DWORD(data, PTP_OUT_SYNCHRONIZE_WAITNS); >> + >> + /* Ignore seconds */ >> + start_ns = timeset->host_start & MC_NANOSECOND_MASK; >> + end_ns = timeset->host_end & MC_NANOSECOND_MASK; >> + /* Allow for rollover */ >> + if (end_ns < start_ns) >> + end_ns += NSEC_PER_SEC; >> + /* Determine duration of operation */ >> + timeset->window = end_ns - start_ns; >> +} >> + >> +/* Process times received from MC. >> + * >> + * Extract times from returned results, and establish the minimum value >> + * seen. The minimum value represents the "best" possible time and events >> + * too much greater than this are rejected - the machine is, perhaps, too >> + * busy. A number of readings are taken so that, hopefully, at least one good >> + * synchronisation will be seen in the results. >> + */ > > This code looks like it is trying to find the offset between two > clocks. Is there some reason why you cannot use <linux/timecompare.h> > to accomplish this? This is what the code is doing. <linux/timecompare.h> states "the assumption is that reading the source time is slow and involves equal time for sending the request and receiving the reply" While in our case event though it is slow we cannot guarantee the second assumption. The code above takes into account some of the particulars of the sfc hardware and gives us good results. > > Also, these comments about "hopefull" synchronization make me > nervous. I think it might be easier just to offer RAW timestamps and > forget about the SYS timestamps. This comment is perhaps a bit flippant and makes the situation sound worse than it is. > > I am trying to purge the whole SYS thing (only blackfin is left) > because there is a much better way to go about this, namely > synchronizing the system time to the PHC time via an internal PPS > signal. This may be possible in future. But leads us to another problem where the PPS event that is generated by the PHC subsystem to the PPS subsystem is stamped with the current system_time. That may be fine for a PPS signal generated from an interrupt but not when the internal PPS event has implicit jitter from the handler/event_queue that we have in the driver. Calling pps_event directly does not seem possible with the current header/structure layout preventing access to ptp_clock->pps_source. Including ptp_private.h seems wrong. > >> +static int efx_ptp_process_times(struct efx_nic *efx, u8 *synch_buf, >> + size_t response_length, >> + struct timespec *last_time) >> +{ >> + unsigned number_readings = (response_length / >> + MC_CMD_PTP_OUT_SYNCHRONIZE_TIMESET_LEN); >> + unsigned i; >> + unsigned min; >> + unsigned min_set = 0; >> + unsigned total; >> + unsigned ngood = 0; >> + unsigned last_good = 0; >> + struct efx_ptp_data *ptp = efx->ptp_data; >> + bool min_valid = false; >> + u32 last_sec; >> + u32 start_sec; >> + >> + if (number_readings == 0) >> + return -EAGAIN; >> + >> + /* Find minimum value in this set of results, discarding clearly >> + * erroneous results. >> + */ >> + for (i = 0; i < number_readings; i++) { >> + efx_ptp_read_timeset(synch_buf, &ptp->timeset[i]); >> + synch_buf += MC_CMD_PTP_OUT_SYNCHRONIZE_TIMESET_LEN; >> + if (ptp->timeset[i].window > SYNCHRONISATION_GRANULARITY_NS) { >> + if (min_valid) { >> + if (ptp->timeset[i].window < min_set) >> + min_set = ptp->timeset[i].window; >> + } else { >> + min_valid = true; >> + min_set = ptp->timeset[i].window; >> + } >> + } >> + } >> + >> + if (min_valid) { >> + if (ptp->base_sync_valid && (min_set > ptp->base_sync_ns)) >> + min = ptp->base_sync_ns; >> + else >> + min = min_set; >> + } else { >> + min = SYNCHRONISATION_GRANULARITY_NS; >> + } >> + >> + /* Discard excessively long synchronise durations. The MC times >> + * when it finishes reading the host time so the corrected window >> + * time should be fairly constant for a given platform. >> + */ >> + total = 0; >> + for (i = 0; i < number_readings; i++) >> + if (ptp->timeset[i].window > ptp->timeset[i].waitns) { >> + unsigned win; >> + >> + win = ptp->timeset[i].window - ptp->timeset[i].waitns; >> + if (win >= MIN_SYNCHRONISATION_NS && >> + win < MAX_SYNCHRONISATION_NS) { >> + total += ptp->timeset[i].window; >> + ngood++; >> + last_good = i; >> + } >> + } >> + >> + if (ngood == 0) { >> + netif_warn(efx, drv, efx->net_dev, >> + "PTP no suitable synchronisations %dns %dns\n", >> + ptp->base_sync_ns, min_set); >> + return -EAGAIN; >> + } >> + >> + /* Average minimum this synchronisation */ >> + ptp->last_sync_ns = DIV_ROUND_UP(total, ngood); >> + if (!ptp->base_sync_valid || (ptp->last_sync_ns < ptp->base_sync_ns)) { >> + ptp->base_sync_valid = true; >> + ptp->base_sync_ns = ptp->last_sync_ns; >> + } >> + >> + ptp->mc_base_time = ktime_set(ptp->timeset[last_good].seconds, >> + ptp->timeset[last_good].nanoseconds); >> + last_time->tv_nsec = >> + ptp->timeset[last_good].host_start & MC_NANOSECOND_MASK; >> + >> + /* It is possible that the seconds rolled over between taking >> + * the start reading and the last value written by the host. The >> + * timescales are such that a gap of more than one second is never >> + * expected. >> + */ >> + start_sec = ptp->timeset[last_good].host_start >> MC_NANOSECOND_BITS; >> + last_sec = last_time->tv_sec & MC_SECOND_MASK; >> + if (start_sec != last_sec) { >> + if (((start_sec + 1) & MC_SECOND_MASK) != last_sec) { >> + netif_warn(efx, hw, efx->net_dev, >> + "PTP bad synchronisation seconds\n"); >> + return -EAGAIN; >> + } else { >> + last_time->tv_sec--; >> + } >> + } >> + ptp->host_base_time = ktime_set(last_time->tv_sec, >> + last_time->tv_nsec); >> + >> + /* At least one good synchronisation */ >> + ptp->base_time_valid = true; >> + >> + return 0; >> +} >> + >> +/* Synchronize times between the host and the MC */ >> +static int efx_ptp_synchronize(struct efx_nic *efx, unsigned int num_readings) >> +{ >> + struct efx_ptp_data *ptp = efx->ptp_data; >> + u8 synch_buf[MC_CMD_PTP_OUT_SYNCHRONIZE_LENMAX]; >> + size_t response_length; >> + int rc; >> + unsigned long timeout; >> + struct timespec last_time; >> + unsigned int loops = 0; >> + int *start = ptp->start.addr; >> + >> + last_time.tv_sec = 0; >> + last_time.tv_nsec = 0; >> + >> + MCDI_SET_DWORD(synch_buf, PTP_IN_OP, MC_CMD_PTP_OP_SYNCHRONIZE); >> + MCDI_SET_DWORD(synch_buf, PTP_IN_SYNCHRONIZE_NUMTIMESETS, >> + num_readings); >> + MCDI_SET_DWORD(synch_buf, PTP_IN_SYNCHRONIZE_START_ADDR_LO, >> + (u32)ptp->start.dma_addr); >> + MCDI_SET_DWORD(synch_buf, PTP_IN_SYNCHRONIZE_START_ADDR_HI, >> + (u32)((u64)ptp->start.dma_addr >> 32)); >> + >> + /* Clear flag that signals MC ready */ >> + ACCESS_ONCE(*start) = 0; >> + efx_mcdi_rpc_start(efx, MC_CMD_PTP, synch_buf, >> + MC_CMD_PTP_IN_SYNCHRONIZE_LEN); >> + >> + /* Wait for start from MCDI (or timeout) */ >> + timeout = jiffies + msecs_to_jiffies(MAX_SYNCHRONISE_WAIT_MS); >> + while (!ACCESS_ONCE(*start) && (time_before(jiffies, timeout))) { >> + udelay(20); /* Usually start MCDI execution quickly */ >> + loops++; >> + } >> + >> + if (ACCESS_ONCE(*start)) >> + efx_ptp_send_times(efx, &last_time); >> + >> + /* Collect results */ >> + rc = efx_mcdi_rpc_finish(efx, MC_CMD_PTP, >> + MC_CMD_PTP_IN_SYNCHRONIZE_LEN, >> + synch_buf, sizeof(synch_buf), >> + &response_length); >> + if (rc == 0) >> + rc = efx_ptp_process_times(efx, synch_buf, response_length, >> + &last_time); >> + >> + return rc; >> +} >> + >> +/* Get the host time from a given hardware time */ >> +static bool efx_ptp_get_host_time(struct efx_nic *efx, >> + struct skb_shared_hwtstamps *timestamps) >> +{ >> + if (efx->ptp_data->base_time_valid) { >> + ktime_t diff = ktime_sub(timestamps->hwtstamp, >> + efx->ptp_data->mc_base_time); >> + >> + timestamps->syststamp = ktime_add(efx->ptp_data->host_base_time, >> + diff); >> + } >> + >> + return efx->ptp_data->base_time_valid; >> +} >> + >> +/* Transmit a PTP packet, via the MCDI interface, to the wire. */ >> +static int efx_ptp_xmit_skb(struct efx_nic *efx, struct sk_buff *skb) >> +{ >> + u8 *txbuf = efx->ptp_data->txbuf; >> + struct skb_shared_hwtstamps timestamps; >> + int rc = -EIO; >> + /* MCDI driver requires word aligned lengths */ >> + size_t len = ALIGN(MC_CMD_PTP_IN_TRANSMIT_LEN(skb->len), 4); >> + u8 txtime[MC_CMD_PTP_OUT_TRANSMIT_LEN]; >> + >> + MCDI_SET_DWORD(txbuf, PTP_IN_OP, MC_CMD_PTP_OP_TRANSMIT); >> + MCDI_SET_DWORD(txbuf, PTP_IN_TRANSMIT_LENGTH, skb->len); >> + if (skb_shinfo(skb)->nr_frags != 0) { >> + rc = skb_linearize(skb); >> + if (rc != 0) >> + goto fail; >> + } >> + >> + if (skb->ip_summed == CHECKSUM_PARTIAL) { >> + rc = skb_checksum_help(skb); >> + if (rc != 0) >> + goto fail; >> + } >> + skb_copy_from_linear_data(skb, >> + &txbuf[MC_CMD_PTP_IN_TRANSMIT_PACKET_OFST], >> + len); >> + rc = efx_mcdi_rpc(efx, MC_CMD_PTP, txbuf, len, txtime, >> + sizeof(txtime), &len); >> + if (rc != 0) >> + goto fail; >> + >> + memset(×tamps, 0, sizeof(timestamps)); >> + timestamps.hwtstamp = ktime_set( >> + MCDI_DWORD(txtime, PTP_OUT_TRANSMIT_SECONDS), >> + MCDI_DWORD(txtime, PTP_OUT_TRANSMIT_NANOSECONDS)); >> + if (efx_ptp_get_host_time(efx, ×tamps)) >> + skb_tstamp_tx(skb, ×tamps); >> + /* Success even if hardware timestamping failed */ >> + rc = 0; >> + >> +fail: >> + dev_kfree_skb(skb); >> + >> + return rc; >> +} >> + >> +static void efx_ptp_drop_time_expired_events(struct efx_nic *efx) >> +{ >> + struct efx_ptp_data *ptp = efx->ptp_data; >> + struct list_head *cursor; >> + struct list_head *next; >> + >> + /* Drop time-expired events */ >> + spin_lock_bh(&ptp->evt_lock); >> + if (!list_empty(&ptp->evt_list)) { >> + list_for_each_safe(cursor, next, &ptp->evt_list) { >> + struct efx_ptp_event_rx *evt; >> + >> + evt = list_entry(cursor, struct efx_ptp_event_rx, >> + link); >> + if (time_after(jiffies, evt->expiry)) { >> + list_del(&evt->link); >> + list_add(&evt->link, &ptp->evt_free_list); >> + netif_warn(efx, hw, efx->net_dev, >> + "PTP rx event dropped\n"); >> + } >> + } >> + } >> + spin_unlock_bh(&ptp->evt_lock); >> +} >> + >> +static enum ptp_packet_state efx_ptp_match_rx(struct efx_nic *efx, >> + struct sk_buff *skb) >> +{ >> + struct efx_ptp_data *ptp = efx->ptp_data; >> + bool evts_waiting; >> + struct list_head *cursor; >> + struct list_head *next; >> + struct efx_ptp_match *match; >> + enum ptp_packet_state rc = PTP_PACKET_STATE_UNMATCHED; >> + >> + spin_lock_bh(&ptp->evt_lock); >> + evts_waiting = !list_empty(&ptp->evt_list); >> + spin_unlock_bh(&ptp->evt_lock); >> + >> + if (!evts_waiting) >> + return PTP_PACKET_STATE_UNMATCHED; >> + >> + match = (struct efx_ptp_match *)skb->cb; >> + /* Look for a matching timestamp in the event queue */ >> + spin_lock_bh(&ptp->evt_lock); >> + list_for_each_safe(cursor, next, &ptp->evt_list) { >> + struct efx_ptp_event_rx *evt; >> + >> + evt = list_entry(cursor, struct efx_ptp_event_rx, link); >> + if ((evt->seq0 == match->words[0]) && >> + (evt->seq1 == match->words[1])) { >> + struct skb_shared_hwtstamps *timestamps; >> + >> + /* Match - add in hardware timestamp */ >> + timestamps = skb_hwtstamps(skb); >> + timestamps->hwtstamp = evt->hwtimestamp; >> + >> + match->state = PTP_PACKET_STATE_MATCHED; >> + rc = PTP_PACKET_STATE_MATCHED; >> + list_del(&evt->link); >> + list_add(&evt->link, &ptp->evt_free_list); >> + break; >> + } >> + } >> + spin_unlock_bh(&ptp->evt_lock); >> + >> + return rc; >> +} >> + >> +/* Process any queued receive events and corresponding packets >> + * >> + * q is returned with all the packets that are ready for delivery. >> + * true is returned if at least one of those packets requires >> + * synchronisation. >> + */ >> +static bool efx_ptp_process_events(struct efx_nic *efx, struct sk_buff_head *q) >> +{ >> + struct efx_ptp_data *ptp = efx->ptp_data; >> + bool rc = false; >> + struct sk_buff *skb; >> + >> + while ((skb = skb_dequeue(&ptp->rxq))) { >> + struct efx_ptp_match *match; >> + >> + match = (struct efx_ptp_match *)skb->cb; >> + if (match->state == PTP_PACKET_STATE_MATCH_UNWANTED) { >> + __skb_queue_tail(q, skb); >> + } else if (efx_ptp_match_rx(efx, skb) == >> + PTP_PACKET_STATE_MATCHED) { >> + rc = true; >> + __skb_queue_tail(q, skb); >> + } else if (time_after(jiffies, match->expiry)) { >> + match->state = PTP_PACKET_STATE_TIMED_OUT; >> + netif_warn(efx, rx_err, efx->net_dev, >> + "PTP packet - no timestamp seen\n"); >> + __skb_queue_tail(q, skb); >> + } else { >> + /* Replace unprocessed entry and stop */ >> + skb_queue_head(&ptp->rxq, skb); >> + break; >> + } >> + } >> + >> + return rc; >> +} >> + >> +/* Complete processing of a received packet */ >> +static void efx_ptp_process_rx(struct efx_nic *efx, struct sk_buff *skb) >> +{ >> + struct efx_ptp_match *match = (struct efx_ptp_match *)skb->cb; >> + >> + /* Translate timestamps, as required */ >> + if (match->state == PTP_PACKET_STATE_MATCHED) { >> + struct skb_shared_hwtstamps *timestamps; >> + >> + timestamps = skb_hwtstamps(skb); >> + efx_ptp_get_host_time(efx, timestamps); >> + } >> + >> + local_bh_disable(); >> + netif_receive_skb(skb); >> + local_bh_enable(); >> +} >> + >> +static int efx_ptp_start(struct efx_nic *efx) >> +{ >> + struct efx_ptp_data *ptp = efx->ptp_data; >> + struct efx_filter_spec rxfilter; >> + int rc; >> + >> + ptp->reset_required = false; >> + >> + /* Must resynchronise when starting */ >> + ptp->base_time_valid = false; >> + ptp->base_sync_valid = false; >> + >> + /* Must filter on both event and general ports to ensure >> + * that there is no packet re-ordering. >> + */ >> + efx_filter_init_rx(&rxfilter, EFX_FILTER_PRI_REQUIRED, 0, >> + efx_rx_queue_index( >> + efx_channel_get_rx_queue(ptp->channel))); >> + rc = efx_filter_set_ipv4_local(&rxfilter, IPPROTO_UDP, >> + htonl(PTP_ADDRESS), >> + htons(PTP_EVENT_PORT)); >> + if (rc != 0) >> + return rc; >> + >> + rc = efx_filter_insert_filter(efx, &rxfilter, true); >> + if (rc < 0) >> + return rc; >> + ptp->rxfilter_event = rc; >> + >> + efx_filter_init_rx(&rxfilter, EFX_FILTER_PRI_REQUIRED, 0, >> + efx_rx_queue_index( >> + efx_channel_get_rx_queue(ptp->channel))); >> + rc = efx_filter_set_ipv4_local(&rxfilter, IPPROTO_UDP, >> + htonl(PTP_ADDRESS), >> + htons(PTP_GENERAL_PORT)); >> + if (rc != 0) >> + goto fail; >> + >> + rc = efx_filter_insert_filter(efx, &rxfilter, true); >> + if (rc < 0) >> + goto fail; >> + ptp->rxfilter_general = rc; >> + >> + rc = efx_ptp_enable(efx); >> + if (rc != 0) >> + goto fail2; >> + >> + ptp->evt_frag_idx = 0; >> + ptp->current_adjfreq = 0; >> + ptp->rxfilter_installed = true; >> + >> + return 0; >> + >> +fail2: >> + efx_filter_remove_id_safe(efx, EFX_FILTER_PRI_REQUIRED, >> + ptp->rxfilter_general); >> +fail: >> + efx_filter_remove_id_safe(efx, EFX_FILTER_PRI_REQUIRED, >> + ptp->rxfilter_event); >> + >> + return rc; >> +} >> + >> +static int efx_ptp_stop(struct efx_nic *efx) >> +{ >> + struct efx_ptp_data *ptp = efx->ptp_data; >> + int rc = efx_ptp_disable(efx); >> + struct list_head *cursor; >> + struct list_head *next; >> + >> + if (ptp->rxfilter_installed) { >> + efx_filter_remove_id_safe(efx, EFX_FILTER_PRI_REQUIRED, >> + ptp->rxfilter_general); >> + efx_filter_remove_id_safe(efx, EFX_FILTER_PRI_REQUIRED, >> + ptp->rxfilter_event); >> + ptp->rxfilter_installed = false; >> + } >> + >> + /* Make sure RX packets are really delivered */ >> + efx_ptp_deliver_rx_queue(&efx->ptp_data->rxq); >> + skb_queue_purge(&efx->ptp_data->txq); >> + >> + /* Drop any pending receive events */ >> + spin_lock_bh(&efx->ptp_data->evt_lock); >> + list_for_each_safe(cursor, next, &efx->ptp_data->evt_list) { >> + list_del(cursor); >> + list_add(cursor, &efx->ptp_data->evt_free_list); >> + } >> + spin_unlock_bh(&efx->ptp_data->evt_lock); >> + >> + return rc; >> +} >> + >> +static void efx_ptp_pps_worker(struct work_struct *work) >> +{ >> + struct efx_ptp_data *ptp = >> + container_of(work, struct efx_ptp_data, pps_work); >> + struct efx_nic *efx = ptp->channel->efx; >> + struct timespec event_gen_time; >> + struct ptp_clock_event ptp_pps_evt; >> + ktime_t gen_time_host; >> + >> + if (efx_ptp_synchronize(efx, PTP_SYNC_ATTEMPTS)) >> + return; >> + >> + gen_time_host = ktime_sub(ptp->mc_base_time, >> + ptp->host_base_time); >> + event_gen_time = ktime_to_timespec(gen_time_host); >> + >> + ptp_pps_evt.type = PTP_CLOCK_EXTTS; >> + ptp_pps_evt.timestamp = ktime_to_ns(gen_time_host); >> + ptp_clock_event(ptp->phc_clock, &ptp_pps_evt); >> +} >> + >> +/* Process any pending transmissions and timestamp any received packets. >> + * >> + * Host and NIC time are synchronised once if there is any work to do: >> + * the process is relatively expensive so don't do it for each packet. >> + */ >> +static void efx_ptp_worker(struct work_struct *work) >> +{ >> + struct efx_ptp_data *ptp_data = >> + container_of(work, struct efx_ptp_data, work); >> + struct efx_nic *efx = ptp_data->channel->efx; >> + struct sk_buff *skb; >> + struct sk_buff_head tempq; >> + >> + if (ptp_data->reset_required) { >> + efx_ptp_stop(efx); >> + efx_ptp_start(efx); >> + return; >> + } >> + >> + efx_ptp_drop_time_expired_events(efx); >> + >> + __skb_queue_head_init(&tempq); >> + if (efx_ptp_process_events(efx, &tempq) || >> + !skb_queue_empty(&ptp_data->txq)) { >> + /* Synchronise PC/MC times when there's work to do. This >> + * isn't fatal but would be unusual (because of the retries >> + * within efx_ptp_synchronize). Failure may suggest a heavily >> + * overloaded system. >> + */ >> + if (0 != efx_ptp_synchronize(efx, PTP_SYNC_ATTEMPTS)) >> + netif_warn(efx, drv, efx->net_dev, >> + "PTP couldn't get synchronisation\n"); >> + >> + while ((skb = skb_dequeue(&ptp_data->txq))) >> + efx_ptp_xmit_skb(efx, skb); >> + } >> + >> + while ((skb = __skb_dequeue(&tempq))) >> + efx_ptp_process_rx(efx, skb); >> +} >> + >> +/* Initialise PTP channel and state. >> + * >> + * Setting core_index to zero causes the queue to be initialised and doesn't >> + * overlap with 'rxq0' because ptp.c doesn't use skb_record_rx_queue. >> + */ >> +static int efx_ptp_probe_channel(struct efx_channel *channel) >> +{ >> + struct efx_nic *efx = channel->efx; >> + struct efx_ptp_data *ptp; >> + int rc = 0; >> + unsigned int pos; >> + >> + channel->irq_moderation = 0; >> + channel->rx_queue.core_index = 0; >> + >> + ptp = kzalloc(sizeof(struct efx_ptp_data), GFP_KERNEL); >> + efx->ptp_data = ptp; >> + if (!efx->ptp_data) >> + return -ENOMEM; >> + >> + rc = efx_nic_alloc_buffer(efx, &ptp->start, sizeof(int)); >> + if (rc != 0) >> + goto fail1; >> + >> + ptp->channel = channel; >> + skb_queue_head_init(&ptp->rxq); >> + skb_queue_head_init(&ptp->txq); >> + ptp->workwq = create_singlethread_workqueue("sfc_ptp"); >> + if (!ptp->workwq) { >> + rc = -ENOMEM; >> + goto fail2; >> + } >> + >> + INIT_WORK(&ptp->work, efx_ptp_worker); >> + ptp->config.flags = 0; >> + ptp->config.tx_type = HWTSTAMP_TX_OFF; >> + ptp->config.rx_filter = HWTSTAMP_FILTER_NONE; >> + INIT_LIST_HEAD(&ptp->evt_list); >> + INIT_LIST_HEAD(&ptp->evt_free_list); >> + spin_lock_init(&ptp->evt_lock); >> + for (pos = 0; pos < MAX_RECEIVE_EVENTS; pos++) >> + list_add(&ptp->rx_evts[pos].link, &ptp->evt_free_list); >> + >> + ptp->phc_clock_info.owner = THIS_MODULE; >> + snprintf(ptp->phc_clock_info.name, >> + sizeof(ptp->phc_clock_info.name), >> + "%pm", efx->net_dev->perm_addr); >> + ptp->phc_clock_info.max_adj = MAX_PPB; >> + ptp->phc_clock_info.n_alarm = 0; >> + ptp->phc_clock_info.n_ext_ts = 1; >> + ptp->phc_clock_info.n_per_out = 0; >> + ptp->phc_clock_info.pps = 0; >> + ptp->phc_clock_info.adjfreq = efx_phc_adjfreq; >> + ptp->phc_clock_info.adjtime = efx_phc_adjtime; >> + ptp->phc_clock_info.gettime = efx_phc_gettime; >> + ptp->phc_clock_info.settime = efx_phc_settime; >> + ptp->phc_clock_info.enable = efx_phc_enable; >> + >> + ptp->phc_clock = ptp_clock_register(&ptp->phc_clock_info); >> + if (!ptp->phc_clock) >> + goto fail3; >> + >> + INIT_WORK(&ptp->pps_work, efx_ptp_pps_worker); >> + ptp->pps_workwq = create_singlethread_workqueue("sfc_pps"); >> + if (!ptp->pps_workwq) { >> + rc = -ENOMEM; >> + goto fail4; >> + } >> + ptp->nic_ts_enabled = false; >> + >> + return 0; >> +fail4: >> + ptp_clock_unregister(efx->ptp_data->phc_clock); >> + >> +fail3: >> + destroy_workqueue(efx->ptp_data->workwq); >> + >> +fail2: >> + efx_nic_free_buffer(efx, &ptp->start); >> + >> +fail1: >> + kfree(efx->ptp_data); >> + efx->ptp_data = 0; >> + >> + return rc; >> +} >> + >> +static void efx_ptp_remove_channel(struct efx_channel *channel) >> +{ >> + struct efx_nic *efx = channel->efx; >> + >> + if (!efx->ptp_data) >> + return; >> + >> + (void)efx_ptp_disable(channel->efx); >> + >> + cancel_work_sync(&efx->ptp_data->work); >> + cancel_work_sync(&efx->ptp_data->pps_work); >> + >> + skb_queue_purge(&efx->ptp_data->rxq); >> + skb_queue_purge(&efx->ptp_data->txq); >> + >> + ptp_clock_unregister(efx->ptp_data->phc_clock); >> + >> + destroy_workqueue(efx->ptp_data->workwq); >> + destroy_workqueue(efx->ptp_data->pps_workwq); >> + >> + efx_nic_free_buffer(efx, &efx->ptp_data->start); >> + kfree(efx->ptp_data); >> +} >> + >> +static void efx_ptp_get_channel_name(struct efx_channel *channel, >> + char *buf, size_t len) >> +{ >> + snprintf(buf, len, "%s-ptp", channel->efx->name); >> +} >> + >> +/* Determine whether this packet should be processed by the PTP module >> + * or transmitted conventionally. >> + */ >> +bool efx_ptp_is_ptp_tx(struct efx_nic *efx, struct sk_buff *skb) >> +{ >> + return efx->ptp_data && >> + efx->ptp_data->enabled && >> + skb->len >= PTP_MIN_LENGTH && >> + skb->len <= MC_CMD_PTP_IN_TRANSMIT_PACKET_MAXNUM && >> + likely(skb->protocol == htons(ETH_P_IP)) && >> + ip_hdr(skb)->protocol == IPPROTO_UDP && >> + udp_hdr(skb)->dest == htons(PTP_EVENT_PORT); >> +} >> + >> +/* Receive a PTP packet. Packets are queued until the arrival of >> + * the receive timestamp from the MC - this will probably occur after the >> + * packet arrival because of the processing in the MC. >> + */ >> +static void efx_ptp_rx(struct efx_channel *channel, struct sk_buff *skb) >> +{ >> + struct efx_nic *efx = channel->efx; >> + struct efx_ptp_data *ptp = efx->ptp_data; >> + struct efx_ptp_match *match = (struct efx_ptp_match *)skb->cb; >> + u8 *data; >> + unsigned int version; >> + >> + match->expiry = jiffies + msecs_to_jiffies(PKT_EVENT_LIFETIME_MS); >> + >> + /* Correct version? */ >> + if (ptp->mode == MC_CMD_PTP_MODE_V1) { >> + if (skb->len < PTP_V1_MIN_LENGTH) { >> + netif_receive_skb(skb); >> + return; >> + } >> + version = ntohs(*(__be16 *)&skb->data[PTP_V1_VERSION_OFFSET]); >> + if (version != PTP_VERSION_V1) { >> + netif_receive_skb(skb); >> + return; >> + } >> + } else { >> + if (skb->len < PTP_V2_MIN_LENGTH) { >> + netif_receive_skb(skb); >> + return; >> + } >> + version = skb->data[PTP_V2_VERSION_OFFSET]; >> + >> + BUG_ON(ptp->mode != MC_CMD_PTP_MODE_V2); >> + BUILD_BUG_ON(PTP_V1_UUID_OFFSET != PTP_V2_MC_UUID_OFFSET); >> + BUILD_BUG_ON(PTP_V1_UUID_LENGTH != PTP_V2_MC_UUID_LENGTH); >> + BUILD_BUG_ON(PTP_V1_SEQUENCE_OFFSET != PTP_V2_SEQUENCE_OFFSET); >> + BUILD_BUG_ON(PTP_V1_SEQUENCE_LENGTH != PTP_V2_SEQUENCE_LENGTH); >> + >> + if ((version & PTP_VERSION_V2_MASK) != PTP_VERSION_V2) { >> + netif_receive_skb(skb); >> + return; >> + } >> + } >> + >> + /* Does this packet require timestamping? */ >> + if (ntohs(*(__be16 *)&skb->data[PTP_DPORT_OFFSET]) == PTP_EVENT_PORT) { >> + struct skb_shared_hwtstamps *timestamps; >> + >> + match->state = PTP_PACKET_STATE_UNMATCHED; >> + >> + /* Clear all timestamps held: filled in later */ >> + timestamps = skb_hwtstamps(skb); >> + memset(timestamps, 0, sizeof(*timestamps)); >> + >> + /* Extract UUID/Sequence information */ >> + data = skb->data + PTP_V1_UUID_OFFSET; >> + match->words[0] = (data[0] | >> + (data[1] << 8) | >> + (data[2] << 16) | >> + (data[3] << 24)); >> + match->words[1] = (data[4] | >> + (data[5] << 8) | >> + (skb->data[PTP_V1_SEQUENCE_OFFSET + >> + PTP_V1_SEQUENCE_LENGTH - 1] << >> + 16)); >> + } else { >> + match->state = PTP_PACKET_STATE_MATCH_UNWANTED; >> + } >> + >> + skb_queue_tail(&ptp->rxq, skb); >> + queue_work(ptp->workwq, &ptp->work); >> +} >> + >> +/* Transmit a PTP packet. This has to be transmitted by the MC >> + * itself, through an MCDI call. MCDI calls aren't permitted >> + * in the transmit path so defer the actual transmission to a suitable worker. >> + */ >> +int efx_ptp_tx(struct efx_nic *efx, struct sk_buff *skb) >> +{ >> + struct efx_ptp_data *ptp = efx->ptp_data; >> + >> + skb_queue_tail(&ptp->txq, skb); >> + >> + if ((udp_hdr(skb)->dest == htons(PTP_EVENT_PORT)) && >> + (skb->len <= MC_CMD_PTP_IN_TRANSMIT_PACKET_MAXNUM)) >> + efx_xmit_hwtstamp_pending(skb); >> + queue_work(ptp->workwq, &ptp->work); >> + >> + return NETDEV_TX_OK; >> +} >> + >> +static int efx_ptp_change_mode(struct efx_nic *efx, bool enable_wanted, >> + unsigned int new_mode) >> +{ >> + if ((enable_wanted != efx->ptp_data->enabled) || >> + (enable_wanted && (efx->ptp_data->mode != new_mode))) { >> + int rc; >> + >> + if (enable_wanted) { >> + /* Change of mode requires disable */ >> + if (efx->ptp_data->enabled && >> + (efx->ptp_data->mode != new_mode)) { >> + efx->ptp_data->enabled = false; >> + rc = efx_ptp_stop(efx); >> + if (rc != 0) >> + return rc; >> + } >> + >> + /* Set new operating mode and establish >> + * baseline synchronisation, which must >> + * succeed. >> + */ >> + efx->ptp_data->mode = new_mode; >> + rc = efx_ptp_start(efx); >> + if (rc == 0) { >> + rc = efx_ptp_synchronize(efx, >> + PTP_SYNC_ATTEMPTS * 2); >> + if (rc != 0) >> + efx_ptp_stop(efx); >> + } >> + } else { >> + rc = efx_ptp_stop(efx); >> + } >> + >> + if (rc != 0) >> + return rc; >> + >> + efx->ptp_data->enabled = enable_wanted; >> + } >> + >> + return 0; >> +} >> + >> +static int efx_ptp_ts_init(struct efx_nic *efx, struct hwtstamp_config *init) >> +{ >> + bool enable_wanted = false; >> + unsigned int new_mode; >> + int rc; >> + >> + if (init->flags) >> + return -EINVAL; >> + >> + if ((init->tx_type != HWTSTAMP_TX_OFF) && >> + (init->tx_type != HWTSTAMP_TX_ON)) >> + return -ERANGE; >> + >> + new_mode = efx->ptp_data->mode; >> + /* Determine whether any PTP HW operations are required */ >> + switch (init->rx_filter) { >> + case HWTSTAMP_FILTER_NONE: >> + break; >> + case HWTSTAMP_FILTER_PTP_V1_L4_EVENT: >> + case HWTSTAMP_FILTER_PTP_V1_L4_SYNC: >> + case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ: >> + init->rx_filter = HWTSTAMP_FILTER_PTP_V1_L4_EVENT; >> + new_mode = MC_CMD_PTP_MODE_V1; >> + enable_wanted = true; >> + break; >> + case HWTSTAMP_FILTER_PTP_V2_L4_EVENT: >> + case HWTSTAMP_FILTER_PTP_V2_L4_SYNC: >> + case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ: >> + /* Although these three are accepted only IPV4 packets will be >> + * timestamped >> + */ >> + case HWTSTAMP_FILTER_PTP_V2_EVENT: >> + case HWTSTAMP_FILTER_PTP_V2_SYNC: >> + case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ: >> + init->rx_filter = HWTSTAMP_FILTER_PTP_V2_L4_EVENT; >> + new_mode = MC_CMD_PTP_MODE_V2; >> + enable_wanted = true; >> + break; >> + case HWTSTAMP_FILTER_PTP_V2_L2_EVENT: >> + case HWTSTAMP_FILTER_PTP_V2_L2_SYNC: >> + case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ: >> + /* Non-IP timestamping not supported */ >> + return -ERANGE; >> + break; >> + default: >> + return -ERANGE; >> + } >> + >> + if (init->tx_type != HWTSTAMP_TX_OFF) >> + enable_wanted = true; >> + >> + rc = efx_ptp_change_mode(efx, enable_wanted, new_mode); >> + if (rc != 0) >> + return rc; >> + >> + efx->ptp_data->config = *init; >> + >> + return 0; >> +} >> + >> +int >> +efx_ptp_get_ts_info(struct net_device *net_dev, struct ethtool_ts_info *ts_info) >> +{ >> + struct efx_nic *efx = netdev_priv(net_dev); >> + struct efx_ptp_data *ptp = efx->ptp_data; >> + >> + if (!ptp) >> + return -EOPNOTSUPP; >> + >> + ts_info->so_timestamping = (SOF_TIMESTAMPING_TX_HARDWARE | >> + SOF_TIMESTAMPING_RX_HARDWARE | >> + SOF_TIMESTAMPING_SYS_HARDWARE | >> + SOF_TIMESTAMPING_RAW_HARDWARE); >> + ts_info->phc_index = ptp_clock_index(ptp->phc_clock); >> + ts_info->tx_types = 1 << HWTSTAMP_TX_OFF | 1 << HWTSTAMP_TX_ON; >> + ts_info->rx_filters = (1 << HWTSTAMP_FILTER_NONE | >> + 1 << HWTSTAMP_FILTER_PTP_V1_L4_EVENT | >> + 1 << HWTSTAMP_FILTER_PTP_V1_L4_SYNC | >> + 1 << HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ | >> + 1 << HWTSTAMP_FILTER_PTP_V2_L4_EVENT | >> + 1 << HWTSTAMP_FILTER_PTP_V2_L4_SYNC | >> + 1 << HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ | >> + 1 << HWTSTAMP_FILTER_PTP_V2_EVENT | >> + 1 << HWTSTAMP_FILTER_PTP_V2_SYNC | >> + 1 << HWTSTAMP_FILTER_PTP_V2_DELAY_REQ); >> + return 0; >> +} >> + >> +int efx_ptp_ioctl(struct efx_nic *efx, struct ifreq *ifr, int cmd) >> +{ >> + struct hwtstamp_config config; >> + int rc; >> + >> + /* Not a PTP enabled port */ >> + if (!efx->ptp_data) >> + return -EOPNOTSUPP; >> + >> + if (copy_from_user(&config, ifr->ifr_data, sizeof(config))) >> + return -EFAULT; >> + >> + rc = efx_ptp_ts_init(efx, &config); >> + if (rc != 0) >> + return rc; >> + >> + return copy_to_user(ifr->ifr_data, &config, sizeof(config)) >> + ? -EFAULT : 0; >> +} >> + >> +static void ptp_event_failure(struct efx_nic *efx, int expected_frag_len) >> +{ >> + struct efx_ptp_data *ptp = efx->ptp_data; >> + >> + netif_err(efx, hw, efx->net_dev, >> + "PTP unexpected event length: got %d expected %d\n", >> + ptp->evt_frag_idx, expected_frag_len); >> + ptp->reset_required = true; >> + queue_work(ptp->workwq, &ptp->work); >> +} >> + >> +/* Process a completed receive event. Put it on the event queue and >> + * start worker thread. This is required because event and their >> + * correspoding packets may come in either order. >> + */ >> +static void ptp_event_rx(struct efx_nic *efx, struct efx_ptp_data *ptp) >> +{ >> + struct efx_ptp_event_rx *evt = NULL; >> + >> + if (ptp->evt_frag_idx != 3) { >> + ptp_event_failure(efx, 3); >> + return; >> + } >> + >> + spin_lock_bh(&ptp->evt_lock); >> + if (!list_empty(&ptp->evt_free_list)) { >> + evt = list_first_entry(&ptp->evt_free_list, >> + struct efx_ptp_event_rx, link); >> + list_del(&evt->link); >> + >> + evt->seq0 = EFX_QWORD_FIELD(ptp->evt_frags[2], MCDI_EVENT_DATA); >> + evt->seq1 = (EFX_QWORD_FIELD(ptp->evt_frags[2], >> + MCDI_EVENT_SRC) | >> + (EFX_QWORD_FIELD(ptp->evt_frags[1], >> + MCDI_EVENT_SRC) << 8) | >> + (EFX_QWORD_FIELD(ptp->evt_frags[0], >> + MCDI_EVENT_SRC) << 16)); >> + evt->hwtimestamp = ktime_set( >> + EFX_QWORD_FIELD(ptp->evt_frags[0], MCDI_EVENT_DATA), >> + EFX_QWORD_FIELD(ptp->evt_frags[1], MCDI_EVENT_DATA)); >> + evt->expiry = jiffies + msecs_to_jiffies(PKT_EVENT_LIFETIME_MS); >> + list_add_tail(&evt->link, &ptp->evt_list); >> + >> + queue_work(ptp->workwq, &ptp->work); >> + } else { >> + netif_err(efx, rx_err, efx->net_dev, "No free PTP event"); >> + } >> + spin_unlock_bh(&ptp->evt_lock); >> +} >> + >> +static void ptp_event_fault(struct efx_nic *efx, struct efx_ptp_data *ptp) >> +{ >> + int code = EFX_QWORD_FIELD(ptp->evt_frags[0], MCDI_EVENT_DATA); >> + if (ptp->evt_frag_idx != 1) { >> + ptp_event_failure(efx, 1); >> + return; >> + } >> + >> + netif_err(efx, hw, efx->net_dev, "PTP error %d\n", code); >> +} >> + >> +static void ptp_event_pps(struct efx_nic *efx, struct efx_ptp_data *ptp) >> +{ >> + if (ptp->nic_ts_enabled) >> + queue_work(ptp->pps_workwq, &ptp->pps_work); >> +} >> + >> +void efx_ptp_event(struct efx_nic *efx, efx_qword_t *ev) >> +{ >> + struct efx_ptp_data *ptp = efx->ptp_data; >> + int code = EFX_QWORD_FIELD(*ev, MCDI_EVENT_CODE); >> + >> + if (!ptp->enabled) >> + return; >> + >> + if (ptp->evt_frag_idx == 0) { >> + ptp->evt_code = code; >> + } else if (ptp->evt_code != code) { >> + netif_err(efx, hw, efx->net_dev, >> + "PTP out of sequence event %d\n", code); >> + ptp->evt_frag_idx = 0; >> + } >> + >> + ptp->evt_frags[ptp->evt_frag_idx++] = *ev; >> + if (!MCDI_EVENT_FIELD(*ev, CONT)) { >> + /* Process resulting event */ >> + switch (code) { >> + case MCDI_EVENT_CODE_PTP_RX: >> + ptp_event_rx(efx, ptp); >> + break; >> + case MCDI_EVENT_CODE_PTP_FAULT: >> + ptp_event_fault(efx, ptp); >> + break; >> + case MCDI_EVENT_CODE_PTP_PPS: >> + ptp_event_pps(efx, ptp); >> + break; >> + default: >> + netif_err(efx, hw, efx->net_dev, >> + "PTP unknown event %d\n", code); >> + break; >> + } >> + ptp->evt_frag_idx = 0; >> + } else if (MAX_EVENT_FRAGS == ptp->evt_frag_idx) { >> + netif_err(efx, hw, efx->net_dev, >> + "PTP too many event fragments\n"); >> + ptp->evt_frag_idx = 0; >> + } >> +} >> + >> +static int efx_phc_adjfreq(struct ptp_clock_info *ptp, s32 delta) >> +{ >> + struct efx_ptp_data *ptp_data = container_of(ptp, >> + struct efx_ptp_data, >> + phc_clock_info); >> + struct efx_nic *efx = ptp_data->channel->efx; >> + u8 inadj[MC_CMD_PTP_IN_ADJUST_LEN]; >> + s64 adjustment_ns; >> + int rc; >> + >> + if (delta > MAX_PPB) >> + delta = MAX_PPB; >> + else if (delta < -MAX_PPB) >> + delta = -MAX_PPB; >> + >> + /* Convert ppb to fixed point ns. */ >> + adjustment_ns = (((s64)delta * PPB_SCALE_WORD) >> >> + (PPB_EXTRA_BITS + MAX_PPB_BITS)); >> + >> + MCDI_SET_DWORD(inadj, PTP_IN_OP, MC_CMD_PTP_OP_ADJUST); >> + MCDI_SET_DWORD(inadj, PTP_IN_ADJUST_FREQ_LO, (u32)adjustment_ns); >> + MCDI_SET_DWORD(inadj, PTP_IN_ADJUST_FREQ_HI, >> + (u32)(adjustment_ns >> 32)); >> + MCDI_SET_DWORD(inadj, PTP_IN_ADJUST_SECONDS, 0); >> + MCDI_SET_DWORD(inadj, PTP_IN_ADJUST_NANOSECONDS, 0); >> + rc = efx_mcdi_rpc(efx, MC_CMD_PTP, inadj, sizeof(inadj), >> + NULL, 0, NULL); >> + if (rc != 0) >> + return rc; >> + >> + ptp_data->current_adjfreq = delta; >> + return 0; >> +} >> + >> +static int efx_phc_adjtime(struct ptp_clock_info *ptp, s64 delta) >> +{ >> + struct efx_ptp_data *ptp_data = container_of(ptp, >> + struct efx_ptp_data, >> + phc_clock_info); >> + struct efx_nic *efx = ptp_data->channel->efx; >> + struct timespec delta_ts = ns_to_timespec(delta); >> + u8 inbuf[MC_CMD_PTP_IN_ADJUST_LEN]; >> + >> + MCDI_SET_DWORD(inbuf, PTP_IN_OP, MC_CMD_PTP_OP_ADJUST); >> + MCDI_SET_DWORD(inbuf, PTP_IN_ADJUST_FREQ_LO, 0); >> + MCDI_SET_DWORD(inbuf, PTP_IN_ADJUST_FREQ_HI, 0); >> + MCDI_SET_DWORD(inbuf, PTP_IN_ADJUST_SECONDS, (u32)delta_ts.tv_sec); >> + MCDI_SET_DWORD(inbuf, PTP_IN_ADJUST_NANOSECONDS, (u32)delta_ts.tv_nsec); >> + return efx_mcdi_rpc(efx, MC_CMD_PTP, inbuf, sizeof(inbuf), >> + NULL, 0, NULL); >> +} >> + >> +static int efx_phc_gettime(struct ptp_clock_info *ptp, struct timespec *ts) >> +{ >> + struct efx_ptp_data *ptp_data = container_of(ptp, >> + struct efx_ptp_data, >> + phc_clock_info); >> + struct efx_nic *efx = ptp_data->channel->efx; >> + u8 inbuf[MC_CMD_PTP_IN_READ_NIC_TIME_LEN]; >> + u8 outbuf[MC_CMD_PTP_OUT_READ_NIC_TIME_LEN]; >> + int rc; >> + >> + MCDI_SET_DWORD(inbuf, PTP_IN_OP, MC_CMD_PTP_OP_READ_NIC_TIME); >> + >> + rc = efx_mcdi_rpc(efx, MC_CMD_PTP, inbuf, sizeof(inbuf), >> + outbuf, sizeof(outbuf), NULL); >> + if (rc != 0) >> + return rc; >> + >> + ts->tv_sec = MCDI_DWORD(outbuf, PTP_OUT_READ_NIC_TIME_SECONDS); >> + ts->tv_nsec = MCDI_DWORD(outbuf, PTP_OUT_READ_NIC_TIME_NANOSECONDS); >> + return 0; >> +} >> + >> +static int efx_phc_settime(struct ptp_clock_info *ptp, >> + const struct timespec *e_ts) >> +{ >> + /* We must provide this function, but we cannot actually set the time */ > > Huh? You can adjtime, so must be able to settime, too, right? > > If you have enough range in the RAW timestamp in the MC firmware (like > 64 bits of nanoseconds), and you allow settime, then you can spare the > system time synchronization code altogether. > You will have to elaborate further on this point. > Thanks, > Richard > > Stu >> + return -EOPNOTSUPP; >> +} >> + >> +static int efx_phc_enable(struct ptp_clock_info *ptp, >> + struct ptp_clock_request *request, >> + int enable) >> +{ >> + struct efx_ptp_data *ptp_data = container_of(ptp, >> + struct efx_ptp_data, >> + phc_clock_info); >> + if (request->type != PTP_CLK_REQ_EXTTS) >> + return -EOPNOTSUPP; >> + >> + ptp_data->nic_ts_enabled = !!enable; >> + return 0; >> +} >> + >> +static const struct efx_channel_type efx_ptp_channel_type = { >> + .handle_no_channel = efx_ptp_handle_no_channel, >> + .pre_probe = efx_ptp_probe_channel, >> + .post_remove = efx_ptp_remove_channel, >> + .get_name = efx_ptp_get_channel_name, >> + /* no copy operation; there is no need to reallocate this channel */ >> + .receive_skb = efx_ptp_rx, >> + .keep_eventq = false, >> +}; >> + >> +void efx_ptp_probe(struct efx_nic *efx) >> +{ >> + /* Check whether PTP is implemented on this NIC. The DISABLE >> + * operation will succeed if and only if it is implemented. >> + */ >> + if (efx_ptp_disable(efx) == 0) >> + efx->extra_channel_type[EFX_EXTRA_CHANNEL_PTP] = >> + &efx_ptp_channel_type; >> +} >> diff --git a/drivers/net/ethernet/sfc/rx.c b/drivers/net/ethernet/sfc/rx.c >> index 92699a0..8923863 100644 >> --- a/drivers/net/ethernet/sfc/rx.c >> +++ b/drivers/net/ethernet/sfc/rx.c >> @@ -573,7 +573,7 @@ static void efx_rx_deliver(struct efx_channel *channel, >> /* Record the rx_queue */ >> skb_record_rx_queue(skb, channel->rx_queue.core_index); >> >> - /* Does the channel want to handle the skb */ >> + /* Pass the packet up */ >> if (channel->type->receive_skb) >> channel->type->receive_skb(channel, skb); >> else >> diff --git a/drivers/net/ethernet/sfc/siena.c b/drivers/net/ethernet/sfc/siena.c >> index 6bafd21..84b41bf 100644 >> --- a/drivers/net/ethernet/sfc/siena.c >> +++ b/drivers/net/ethernet/sfc/siena.c >> @@ -335,6 +335,7 @@ static int siena_probe_nic(struct efx_nic *efx) >> goto fail5; >> >> efx_sriov_probe(efx); >> + efx_ptp_probe(efx); >> >> return 0; >> >> diff --git a/drivers/net/ethernet/sfc/tx.c b/drivers/net/ethernet/sfc/tx.c >> index 9b225a7..66badf8 100644 >> --- a/drivers/net/ethernet/sfc/tx.c >> +++ b/drivers/net/ethernet/sfc/tx.c >> @@ -347,6 +347,12 @@ netdev_tx_t efx_hard_start_xmit(struct sk_buff *skb, >> >> EFX_WARN_ON_PARANOID(!netif_device_present(net_dev)); >> >> + /* PTP "event" packet */ >> + if (unlikely(efx_xmit_with_hwtstamp(skb)) && >> + unlikely(efx_ptp_is_ptp_tx(efx, skb))) { >> + return efx_ptp_tx(efx, skb); >> + } >> + >> index = skb_get_queue_mapping(skb); >> type = skb->ip_summed == CHECKSUM_PARTIAL ? EFX_TXQ_TYPE_OFFLOAD : 0; >> if (index >= efx->n_tx_channels) { >> -- >> 1.7.7.6 >> >> >> >> -- >> Ben Hutchings, Staff Engineer, Solarflare >> Not speaking for my employer; that's the marketing department's job. >> They asked us to note that Solarflare product names are trademarked. >> > -- > To unsubscribe from this list: send the line "unsubscribe netdev" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html ^ permalink raw reply [flat|nested] 23+ messages in thread
* Re: [PATCH net-next 4/7] sfc: Add support for IEEE-1588 PTP 2012-07-19 15:29 ` Stuart Hodgson @ 2012-07-19 15:43 ` David Miller 2012-07-19 15:50 ` Ben Hutchings 2012-07-20 6:31 ` Richard Cochran 2 siblings, 0 replies; 23+ messages in thread From: David Miller @ 2012-07-19 15:43 UTC (permalink / raw) To: smhodgson; +Cc: richardcochran, bhutchings, netdev, linux-net-drivers, ajackson I really wish we hadn't started quoting an entire HUGE patch file in this discussion. Only quote the relevant snippets of the patch for the purposes of the discussion when replying, thank you. ^ permalink raw reply [flat|nested] 23+ messages in thread
* Re: [PATCH net-next 4/7] sfc: Add support for IEEE-1588 PTP 2012-07-19 15:29 ` Stuart Hodgson 2012-07-19 15:43 ` David Miller @ 2012-07-19 15:50 ` Ben Hutchings 2012-07-20 7:37 ` Richard Cochran 2012-07-20 6:31 ` Richard Cochran 2 siblings, 1 reply; 23+ messages in thread From: Ben Hutchings @ 2012-07-19 15:50 UTC (permalink / raw) To: Stuart Hodgson Cc: Richard Cochran, David Miller, netdev, linux-net-drivers, Andrew Jackson On Thu, 2012-07-19 at 16:29 +0100, Stuart Hodgson wrote: > On 19/07/12 15:25, Richard Cochran wrote: [...] > > I am trying to purge the whole SYS thing (only blackfin is left) > > because there is a much better way to go about this, namely > > synchronizing the system time to the PHC time via an internal PPS > > signal. > > This may be possible in future. But leads us to another problem > where the PPS event that is generated by the PHC subsystem to the > PPS subsystem is stamped with the current system_time. That may > be fine for a PPS signal generated from an interrupt but not when > the internal PPS event has implicit jitter from the handler/event_queue > that we have in the driver. [...] We can certainly take a timestamp in the hard interrupt handler; in fact that's what I originally expected we would do since we have a separate MSI-X vector for PTP. But even hard interrupt handling can be subject to substantial jitter. Ben. -- Ben Hutchings, Staff Engineer, Solarflare Not speaking for my employer; that's the marketing department's job. They asked us to note that Solarflare product names are trademarked. ^ permalink raw reply [flat|nested] 23+ messages in thread
* Re: [PATCH net-next 4/7] sfc: Add support for IEEE-1588 PTP 2012-07-19 15:50 ` Ben Hutchings @ 2012-07-20 7:37 ` Richard Cochran 0 siblings, 0 replies; 23+ messages in thread From: Richard Cochran @ 2012-07-20 7:37 UTC (permalink / raw) To: Ben Hutchings Cc: Stuart Hodgson, David Miller, netdev, linux-net-drivers, Andrew Jackson On Thu, Jul 19, 2012 at 04:50:51PM +0100, Ben Hutchings wrote: > On Thu, 2012-07-19 at 16:29 +0100, Stuart Hodgson wrote: > > On 19/07/12 15:25, Richard Cochran wrote: > [...] > > > I am trying to purge the whole SYS thing (only blackfin is left) > > > because there is a much better way to go about this, namely > > > synchronizing the system time to the PHC time via an internal PPS > > > signal. > > > > This may be possible in future. But leads us to another problem > > where the PPS event that is generated by the PHC subsystem to the > > PPS subsystem is stamped with the current system_time. That may > > be fine for a PPS signal generated from an interrupt but not when > > the internal PPS event has implicit jitter from the handler/event_queue > > that we have in the driver. > [...] > > We can certainly take a timestamp in the hard interrupt handler; in fact > that's what I originally expected we would do since we have a separate > MSI-X vector for PTP. But even hard interrupt handling can be subject > to substantial jitter. What kind of jitter do you see or expect? I did a study of synching system to PHC on a PowerPC system, where the PPS timestamps varied from about 10 usec (on average under light load) to over 30 usec (under heavy load). Even so, it was easy to synchronize the system clock to within about a microsecond under light load, with heavy load producing about an additional 6 usec error. Thanks, Richard ^ permalink raw reply [flat|nested] 23+ messages in thread
* Re: [PATCH net-next 4/7] sfc: Add support for IEEE-1588 PTP 2012-07-19 15:29 ` Stuart Hodgson 2012-07-19 15:43 ` David Miller 2012-07-19 15:50 ` Ben Hutchings @ 2012-07-20 6:31 ` Richard Cochran 2012-07-20 9:15 ` Stuart Hodgson 2 siblings, 1 reply; 23+ messages in thread From: Richard Cochran @ 2012-07-20 6:31 UTC (permalink / raw) To: Stuart Hodgson Cc: Ben Hutchings, David Miller, netdev, linux-net-drivers, Andrew Jackson On Thu, Jul 19, 2012 at 04:29:51PM +0100, Stuart Hodgson wrote: > On 19/07/12 15:25, Richard Cochran wrote: > > On Wed, Jul 18, 2012 at 07:21:33PM +0100, Ben Hutchings wrote: > >> Add PTP IEEE-1588 support and make accesible via the PHC subsystem. ... > >> +/* Process times received from MC. > >> + * > >> + * Extract times from returned results, and establish the minimum value > >> + * seen. The minimum value represents the "best" possible time and events > >> + * too much greater than this are rejected - the machine is, perhaps, too > >> + * busy. A number of readings are taken so that, hopefully, at least one good > >> + * synchronisation will be seen in the results. > >> + */ > > > > This code looks like it is trying to find the offset between two > > clocks. Is there some reason why you cannot use <linux/timecompare.h> > > to accomplish this? > > This is what the code is doing. <linux/timecompare.h> states > > "the assumption is that reading the source > time is slow and involves equal time for sending the request and > receiving the reply" > > While in our case event though it is slow we cannot guarantee the second > assumption. The code above takes into account some of the particulars of the sfc > hardware and gives us good results. Fair enough, but then maybe a comment mentioning how timecompare is unsuitable would be nice to have. > > I am trying to purge the whole SYS thing (only blackfin is left) > > because there is a much better way to go about this, namely > > synchronizing the system time to the PHC time via an internal PPS > > signal. > > This may be possible in future. But leads us to another problem > where the PPS event that is generated by the PHC subsystem to the > PPS subsystem is stamped with the current system_time. That may > be fine for a PPS signal generated from an interrupt but not when > the internal PPS event has implicit jitter from the handler/event_queue > that we have in the driver. Yes, both your driver and timecompare** suffer from the same defect, namely that the synchronization times are determined by network traffic, and not at some regular frequency like 1 Hz. Why not just offer a 1 PPS signal using the standard method? If you cannot produce a real interrupt for this, you can at least use a synthetic one using a periodically scheduled work. ** Actually, timecompare is a bit better as it ensures that the measurements occur no more than once per second. > Calling pps_event directly does not seem possible with the current > header/structure layout preventing access to ptp_clock->pps_source. > Including ptp_private.h seems wrong. I don't understand what the issue is here. Can't you just call ptp_clock_event, like you already have... > >> +static void efx_ptp_pps_worker(struct work_struct *work) > >> +{ > >> + struct efx_ptp_data *ptp = > >> + container_of(work, struct efx_ptp_data, pps_work); > >> + struct efx_nic *efx = ptp->channel->efx; > >> + struct timespec event_gen_time; > >> + struct ptp_clock_event ptp_pps_evt; > >> + ktime_t gen_time_host; > >> + > >> + if (efx_ptp_synchronize(efx, PTP_SYNC_ATTEMPTS)) > >> + return; > >> + > >> + gen_time_host = ktime_sub(ptp->mc_base_time, > >> + ptp->host_base_time); > >> + event_gen_time = ktime_to_timespec(gen_time_host); > >> + > >> + ptp_pps_evt.type = PTP_CLOCK_EXTTS; > >> + ptp_pps_evt.timestamp = ktime_to_ns(gen_time_host); > >> + ptp_clock_event(ptp->phc_clock, &ptp_pps_evt); > >> +} ... here? > >> +static int efx_phc_adjtime(struct ptp_clock_info *ptp, s64 delta) > >> +{ You can set the time here somehow by doing, T' = T + offset, and so... > >> +} > >> +static int efx_phc_settime(struct ptp_clock_info *ptp, > >> + const struct timespec *e_ts) > >> +{ > >> + /* We must provide this function, but we cannot actually set the time */ > > > > Huh? You can adjtime, so must be able to settime, too, right? > > > > If you have enough range in the RAW timestamp in the MC firmware (like > > 64 bits of nanoseconds), and you allow settime, then you can spare the > > system time synchronization code altogether. > > > > You will have to elaborate further on this point. ... why can't you also just set the time? Thanks, Richard ^ permalink raw reply [flat|nested] 23+ messages in thread
* Re: [PATCH net-next 4/7] sfc: Add support for IEEE-1588 PTP 2012-07-20 6:31 ` Richard Cochran @ 2012-07-20 9:15 ` Stuart Hodgson 2012-07-20 15:30 ` Richard Cochran 0 siblings, 1 reply; 23+ messages in thread From: Stuart Hodgson @ 2012-07-20 9:15 UTC (permalink / raw) To: Richard Cochran Cc: Ben Hutchings, David Miller, netdev, linux-net-drivers, Andrew Jackson >>> This code looks like it is trying to find the offset between two >>> clocks. Is there some reason why you cannot use <linux/timecompare.h> >>> to accomplish this? >> >> This is what the code is doing. <linux/timecompare.h> states >> >> "the assumption is that reading the source >> time is slow and involves equal time for sending the request and >> receiving the reply" >> >> While in our case event though it is slow we cannot guarantee the second >> assumption. The code above takes into account some of the particulars of the sfc >> hardware and gives us good results. > > Fair enough, but then maybe a comment mentioning how timecompare is > unsuitable would be nice to have. > This can be added >>> I am trying to purge the whole SYS thing (only blackfin is left) >>> because there is a much better way to go about this, namely >>> synchronizing the system time to the PHC time via an internal PPS >>> signal. >> Do you mean using the PPS kernel consumer to govern the system time? > I don't understand what the issue is here. Can't you just call > ptp_clock_event, like you already have... > >>>> +static void efx_ptp_pps_worker(struct work_struct *work) >>>> +{ >>>> + struct efx_ptp_data *ptp = >>>> + container_of(work, struct efx_ptp_data, pps_work); >>>> + struct efx_nic *efx = ptp->channel->efx; >>>> + struct timespec event_gen_time; >>>> + struct ptp_clock_event ptp_pps_evt; >>>> + ktime_t gen_time_host; >>>> + >>>> + if (efx_ptp_synchronize(efx, PTP_SYNC_ATTEMPTS)) >>>> + return; >>>> + >>>> + gen_time_host = ktime_sub(ptp->mc_base_time, >>>> + ptp->host_base_time); >>>> + event_gen_time = ktime_to_timespec(gen_time_host); >>>> + >>>> + ptp_pps_evt.type = PTP_CLOCK_EXTTS; >>>> + ptp_pps_evt.timestamp = ktime_to_ns(gen_time_host); >>>> + ptp_clock_event(ptp->phc_clock, &ptp_pps_evt); >>>> +} > > ... here? > In order for a PPS to arrive at the kernel consumer ptp_clock_event needs to be called with PTP_CLOCK_PPS. This then calls pps_get_ts and stamps the event with the current system time, not the time that was put into the event. Using PTP_CLOCK_EXTTS the PPS is visible to userspace via a read on the phc device and can then be used in our modified ptpd2. >>>> +static int efx_phc_adjtime(struct ptp_clock_info *ptp, s64 delta) >>>> +{ > > You can set the time here somehow by doing, T' = T + offset, and so... > >>>> +} > >>>> +static int efx_phc_settime(struct ptp_clock_info *ptp, >>>> + const struct timespec *e_ts) >>>> +{ >>>> + /* We must provide this function, but we cannot actually set the time */ >>> >>> Huh? You can adjtime, so must be able to settime, too, right? >>> >>> If you have enough range in the RAW timestamp in the MC firmware (like >>> 64 bits of nanoseconds), and you allow settime, then you can spare the >>> system time synchronization code altogether. >>> >> >> You will have to elaborate further on this point. > > ... why can't you also just set the time? Our hardware can only have an offset applied to the clock. In order to set time we need to know the time now, then work out and offset to get to the target time. At the point that we apply this offset the clock will have moved on and not be set to the target time. We can apply some measured average times to the offset to get closer but with this hardware settime will not leave the NIC clock at the desired time. > > Thanks, > Richard ^ permalink raw reply [flat|nested] 23+ messages in thread
* Re: [PATCH net-next 4/7] sfc: Add support for IEEE-1588 PTP 2012-07-20 9:15 ` Stuart Hodgson @ 2012-07-20 15:30 ` Richard Cochran 2012-07-30 10:03 ` Stuart Hodgson 0 siblings, 1 reply; 23+ messages in thread From: Richard Cochran @ 2012-07-20 15:30 UTC (permalink / raw) To: Stuart Hodgson Cc: Ben Hutchings, David Miller, netdev, linux-net-drivers, Andrew Jackson On Fri, Jul 20, 2012 at 10:15:46AM +0100, Stuart Hodgson wrote: > > Do you mean using the PPS kernel consumer to govern the system time? Well, I meant just using the PPS subsystem, which does not necessarily mean that the kernel consumer has to be used. In my experience, it is better to handle the servo in user space, but in any case, the user has the choice of what to do. > >>>> + ptp_pps_evt.type = PTP_CLOCK_EXTTS; > >>>> + ptp_pps_evt.timestamp = ktime_to_ns(gen_time_host); > >>>> + ptp_clock_event(ptp->phc_clock, &ptp_pps_evt); > In order for a PPS to arrive at the kernel consumer ptp_clock_event > needs to be called with PTP_CLOCK_PPS. This then calls pps_get_ts > and stamps the event with the current system time, not the time > that was put into the event. Oops, I meant PTP_CLOCK_PPS. I overlooked that your code is making an external timestamp event, but the basic idea is similar. > Using PTP_CLOCK_EXTTS the PPS is visible to userspace via a read > on the phc device and can then be used in our modified ptpd2. How does your program use this information? > > ... why can't you also just set the time? > > Our hardware can only have an offset applied to the clock. In order to set time > we need to know the time now, then work out and offset to get to the target time. > At the point that we apply this offset the clock will have moved on and not be > set to the target time. We can apply some measured average times to the offset > to get closer but with this hardware settime will not leave the NIC clock at the > desired time. It does not matter if setting the time introduces a small error. That usually happens, but it is no big deal, since the servo in the PTP stack will correct the error. Thanks, Richard ^ permalink raw reply [flat|nested] 23+ messages in thread
* Re: [PATCH net-next 4/7] sfc: Add support for IEEE-1588 PTP 2012-07-20 15:30 ` Richard Cochran @ 2012-07-30 10:03 ` Stuart Hodgson 0 siblings, 0 replies; 23+ messages in thread From: Stuart Hodgson @ 2012-07-30 10:03 UTC (permalink / raw) To: Richard Cochran Cc: Ben Hutchings, David Miller, netdev, linux-net-drivers, Andrew Jackson On 20/07/12 16:30, Richard Cochran wrote: > On Fri, Jul 20, 2012 at 10:15:46AM +0100, Stuart Hodgson wrote: >> >> Do you mean using the PPS kernel consumer to govern the system time? > > Well, I meant just using the PPS subsystem, which does not necessarily > mean that the kernel consumer has to be used. In my experience, it is > better to handle the servo in user space, but in any case, the user > has the choice of what to do. > >>>>>> + ptp_pps_evt.type = PTP_CLOCK_EXTTS; >>>>>> + ptp_pps_evt.timestamp = ktime_to_ns(gen_time_host); >>>>>> + ptp_clock_event(ptp->phc_clock, &ptp_pps_evt); > >> In order for a PPS to arrive at the kernel consumer ptp_clock_event >> needs to be called with PTP_CLOCK_PPS. This then calls pps_get_ts >> and stamps the event with the current system time, not the time >> that was put into the event. > > Oops, I meant PTP_CLOCK_PPS. I overlooked that your code is making an > external timestamp event, but the basic idea is similar. > >> Using PTP_CLOCK_EXTTS the PPS is visible to userspace via a read >> on the phc device and can then be used in our modified ptpd2. > > How does your program use this information? > We have a second servo that governs the system time. >>> ... why can't you also just set the time? >> >> Our hardware can only have an offset applied to the clock. In order to set time >> we need to know the time now, then work out and offset to get to the target time. >> At the point that we apply this offset the clock will have moved on and not be >> set to the target time. We can apply some measured average times to the offset >> to get closer but with this hardware settime will not leave the NIC clock at the >> desired time. > > It does not matter if setting the time introduces a small error. That > usually happens, but it is no big deal, since the servo in the PTP > stack will correct the error. > I will add the ability to set the time to the patch. > Thanks, > Richard ^ permalink raw reply [flat|nested] 23+ messages in thread
* [PATCH net-next 5/7] sfc: Support variable-length response to MCDI GET_BOARD_CFG 2012-07-18 18:16 pull request: sfc-next 2012-07-18 Ben Hutchings ` (3 preceding siblings ...) 2012-07-18 18:21 ` [PATCH net-next 4/7] sfc: Add support for IEEE-1588 PTP Ben Hutchings @ 2012-07-18 18:21 ` Ben Hutchings 2012-07-18 18:22 ` [PATCH net-next 6/7] sfc: Expose FPGA bitfile partition through MTD Ben Hutchings 2012-07-18 18:22 ` [PATCH net-next 7/7] sfc: Bump version to 3.2 Ben Hutchings 6 siblings, 0 replies; 23+ messages in thread From: Ben Hutchings @ 2012-07-18 18:21 UTC (permalink / raw) To: David Miller; +Cc: netdev, linux-net-drivers, Andrew Jackson, Richard Cochran Signed-off-by: Ben Hutchings <bhutchings@solarflare.com> --- drivers/net/ethernet/sfc/mcdi.c | 18 +++++++++++++----- drivers/net/ethernet/sfc/mtd.c | 3 ++- 2 files changed, 15 insertions(+), 6 deletions(-) diff --git a/drivers/net/ethernet/sfc/mcdi.c b/drivers/net/ethernet/sfc/mcdi.c index 294df4b..9f74ab6 100644 --- a/drivers/net/ethernet/sfc/mcdi.c +++ b/drivers/net/ethernet/sfc/mcdi.c @@ -660,8 +660,8 @@ fail: int efx_mcdi_get_board_cfg(struct efx_nic *efx, u8 *mac_address, u16 *fw_subtype_list, u32 *capabilities) { - uint8_t outbuf[MC_CMD_GET_BOARD_CFG_OUT_LENMIN]; - size_t outlen; + uint8_t outbuf[MC_CMD_GET_BOARD_CFG_OUT_LENMAX]; + size_t outlen, src_size, dst_size; int port_num = efx_port_num(efx); int offset; int rc; @@ -683,11 +683,19 @@ int efx_mcdi_get_board_cfg(struct efx_nic *efx, u8 *mac_address, : MC_CMD_GET_BOARD_CFG_OUT_MAC_ADDR_BASE_PORT0_OFST; if (mac_address) memcpy(mac_address, outbuf + offset, ETH_ALEN); - if (fw_subtype_list) + if (fw_subtype_list) { + /* Truncate or zero-pad as necessary */ + src_size = (outlen - + MC_CMD_GET_BOARD_CFG_OUT_FW_SUBTYPE_LIST_OFST); + dst_size = (MC_CMD_GET_BOARD_CFG_OUT_FW_SUBTYPE_LIST_MAXNUM * + sizeof(*fw_subtype_list)); memcpy(fw_subtype_list, outbuf + MC_CMD_GET_BOARD_CFG_OUT_FW_SUBTYPE_LIST_OFST, - MC_CMD_GET_BOARD_CFG_OUT_FW_SUBTYPE_LIST_MINNUM * - sizeof(fw_subtype_list[0])); + min(src_size, dst_size)); + if (dst_size < src_size) + memset(fw_subtype_list + src_size, 0, + dst_size - src_size); + } if (capabilities) { if (port_num) *capabilities = MCDI_DWORD(outbuf, diff --git a/drivers/net/ethernet/sfc/mtd.c b/drivers/net/ethernet/sfc/mtd.c index 7581483..8f4604d 100644 --- a/drivers/net/ethernet/sfc/mtd.c +++ b/drivers/net/ethernet/sfc/mtd.c @@ -627,7 +627,8 @@ static int siena_mtd_get_fw_subtypes(struct efx_nic *efx, struct efx_mtd *efx_mtd) { struct efx_mtd_partition *part; - uint16_t fw_subtype_list[MC_CMD_GET_BOARD_CFG_OUT_FW_SUBTYPE_LIST_MINNUM]; + uint16_t fw_subtype_list[ + MC_CMD_GET_BOARD_CFG_OUT_FW_SUBTYPE_LIST_MAXNUM]; int rc; rc = efx_mcdi_get_board_cfg(efx, NULL, fw_subtype_list, NULL); -- 1.7.7.6 -- Ben Hutchings, Staff Engineer, Solarflare Not speaking for my employer; that's the marketing department's job. They asked us to note that Solarflare product names are trademarked. ^ permalink raw reply related [flat|nested] 23+ messages in thread
* [PATCH net-next 6/7] sfc: Expose FPGA bitfile partition through MTD 2012-07-18 18:16 pull request: sfc-next 2012-07-18 Ben Hutchings ` (4 preceding siblings ...) 2012-07-18 18:21 ` [PATCH net-next 5/7] sfc: Support variable-length response to MCDI GET_BOARD_CFG Ben Hutchings @ 2012-07-18 18:22 ` Ben Hutchings 2012-07-18 18:22 ` [PATCH net-next 7/7] sfc: Bump version to 3.2 Ben Hutchings 6 siblings, 0 replies; 23+ messages in thread From: Ben Hutchings @ 2012-07-18 18:22 UTC (permalink / raw) To: David Miller; +Cc: netdev, linux-net-drivers, Andrew Jackson, Richard Cochran Signed-off-by: Ben Hutchings <bhutchings@solarflare.com> --- drivers/net/ethernet/sfc/mtd.c | 4 +++- 1 files changed, 3 insertions(+), 1 deletions(-) diff --git a/drivers/net/ethernet/sfc/mtd.c b/drivers/net/ethernet/sfc/mtd.c index 8f4604d..08f825b 100644 --- a/drivers/net/ethernet/sfc/mtd.c +++ b/drivers/net/ethernet/sfc/mtd.c @@ -585,6 +585,7 @@ static const struct siena_nvram_type_info siena_nvram_types[] = { [MC_CMD_NVRAM_TYPE_EXP_ROM_CFG_PORT1] = { 1, "sfc_exp_rom_cfg" }, [MC_CMD_NVRAM_TYPE_PHY_PORT0] = { 0, "sfc_phy_fw" }, [MC_CMD_NVRAM_TYPE_PHY_PORT1] = { 1, "sfc_phy_fw" }, + [MC_CMD_NVRAM_TYPE_FPGA] = { 0, "sfc_fpga" }, }; static int siena_mtd_probe_partition(struct efx_nic *efx, @@ -598,7 +599,8 @@ static int siena_mtd_probe_partition(struct efx_nic *efx, bool protected; int rc; - if (type >= ARRAY_SIZE(siena_nvram_types)) + if (type >= ARRAY_SIZE(siena_nvram_types) || + siena_nvram_types[type].name == NULL) return -ENODEV; info = &siena_nvram_types[type]; -- 1.7.7.6 -- Ben Hutchings, Staff Engineer, Solarflare Not speaking for my employer; that's the marketing department's job. They asked us to note that Solarflare product names are trademarked. ^ permalink raw reply related [flat|nested] 23+ messages in thread
* [PATCH net-next 7/7] sfc: Bump version to 3.2 2012-07-18 18:16 pull request: sfc-next 2012-07-18 Ben Hutchings ` (5 preceding siblings ...) 2012-07-18 18:22 ` [PATCH net-next 6/7] sfc: Expose FPGA bitfile partition through MTD Ben Hutchings @ 2012-07-18 18:22 ` Ben Hutchings 6 siblings, 0 replies; 23+ messages in thread From: Ben Hutchings @ 2012-07-18 18:22 UTC (permalink / raw) To: David Miller; +Cc: netdev, linux-net-drivers, Andrew Jackson, Richard Cochran The key new feature for 3.2 is PTP support. Signed-off-by: Ben Hutchings <bhutchings@solarflare.com> --- drivers/net/ethernet/sfc/net_driver.h | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/drivers/net/ethernet/sfc/net_driver.h b/drivers/net/ethernet/sfc/net_driver.h index f84a5d5..27b44a3 100644 --- a/drivers/net/ethernet/sfc/net_driver.h +++ b/drivers/net/ethernet/sfc/net_driver.h @@ -37,7 +37,7 @@ * **************************************************************************/ -#define EFX_DRIVER_VERSION "3.1" +#define EFX_DRIVER_VERSION "3.2" #ifdef DEBUG #define EFX_BUG_ON_PARANOID(x) BUG_ON(x) -- 1.7.7.6 -- Ben Hutchings, Staff Engineer, Solarflare Not speaking for my employer; that's the marketing department's job. They asked us to note that Solarflare product names are trademarked. ^ permalink raw reply related [flat|nested] 23+ messages in thread
end of thread, other threads:[~2012-07-30 10:03 UTC | newest] Thread overview: 23+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2012-07-18 18:16 pull request: sfc-next 2012-07-18 Ben Hutchings 2012-07-18 18:19 ` [PATCH net-next 1/7] sfc: Add explicit RX queue flag to channel Ben Hutchings 2012-07-18 18:20 ` [PATCH net-next 2/7] sfc: Add channel specific receive_skb handler and post_remove callback Ben Hutchings 2012-07-18 18:32 ` David Miller 2012-07-18 18:42 ` Ben Hutchings 2012-07-18 18:43 ` David Miller 2012-07-18 18:20 ` [PATCH net-next 3/7] sfc: Allow efx_mcdi_rpc to be called in two parts Ben Hutchings 2012-07-18 18:21 ` [PATCH net-next 4/7] sfc: Add support for IEEE-1588 PTP Ben Hutchings 2012-07-19 14:25 ` Richard Cochran 2012-07-19 14:37 ` Ben Hutchings 2012-07-19 16:05 ` Andrew Jackson 2012-07-20 6:11 ` Richard Cochran 2012-07-19 15:29 ` Stuart Hodgson 2012-07-19 15:43 ` David Miller 2012-07-19 15:50 ` Ben Hutchings 2012-07-20 7:37 ` Richard Cochran 2012-07-20 6:31 ` Richard Cochran 2012-07-20 9:15 ` Stuart Hodgson 2012-07-20 15:30 ` Richard Cochran 2012-07-30 10:03 ` Stuart Hodgson 2012-07-18 18:21 ` [PATCH net-next 5/7] sfc: Support variable-length response to MCDI GET_BOARD_CFG Ben Hutchings 2012-07-18 18:22 ` [PATCH net-next 6/7] sfc: Expose FPGA bitfile partition through MTD Ben Hutchings 2012-07-18 18:22 ` [PATCH net-next 7/7] sfc: Bump version to 3.2 Ben Hutchings
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