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* [PATCH 00/22] NTB: Alter kernel API to support multi-port devices
@ 2016-11-29 17:15 Serge Semin
  2016-11-29 17:15 ` [PATCH 01/22] NTB: Move link state API being first in sources Serge Semin
                   ` (22 more replies)
  0 siblings, 23 replies; 62+ messages in thread
From: Serge Semin @ 2016-11-29 17:15 UTC (permalink / raw)
  To: jdmason, dave.jiang, Allen.Hubbe, Xiangliang.Yu
  Cc: Sergey.Semin, linux-ntb, linux-kernel, Serge Semin

There are devices, like IDT PCIe-switches, which have more than just two ports.
Particularly one device can have up to eight ports with NTB-function activated.
In order to support such devices, NTB kernel API should be altered since
currently it's optimized to work with two-ports devices only.

Here are the changes I made to conform the design we discussed a few months ago:

1) Port-index-related methods are added to KAPI
 ntb_port_number();
 ntb_peer_port_count();
 ntb_peer_port_number(pdix);
 ntb_peer_port_idx(port);

2) Link state method returns bitfield of link states for each reachable port
 u64 ntb_link_is_up();
 
3) Link enable/disable methods work with local link side of NTB
 ntb_link_enable()/ntb_link_disable();
 
4) NTB memory window related interface does the following things
 ntb_mw_count(pidx); - number of inbound memory windows, which can be allocated
for shared buffer with specified peer device.
 ntb_mw_get_align(pidx, widx); - get alignment and size restrition parameters
to properly allocate inbound memory region.
 ntb_peer_mw_count(); - get number of outbound memory windows.
 ntb_peer_mw_get_addr(widx); - get mapping address of an outbound memory window 

Inbound MW based hardware:
 ntb_mw_set_trans(pidx, widx); - set translation address of allocated inbound
memory window so a peer device could access it.
 ntb_mw_clear_trans(pidx, widx); - clear the translation address of an inbound
memory window.

Outbound MW based hardware:
 ntb_peer_mw_set_trans(pidx, widx); - set translation address of a memory
window retrieved from a peer device
 ntb_peer_mw_clear_trans(pidx, widx); - clear the translation address of an
outbound memory window

5) Scratchpad interface needs to support multi-port devices as well
 ntb_spad_count() - return number of Scratchpad per each port
 ntb_peer_spad_addr(pidx, sidx) - address of Scratchpad register of the
peer device with pidx-index
 ntb_peer_spad_read(pidx, sidx) - read specified Scratchpad register of the
peer with pidx-index
 ntb_peer_spad_write(pidx, sidx) - write data to Scratchpad register of the
peer with pidx-index

6) Introduce new messaging interface of NTB KAPI
 ntb_msg_count(); - get number of message registers
 ntb_msg_inbits(); - get bitfield of inbound message registers status
 ntb_msg_outbits(); - get bitfield of outbound message registers status
 ntb_msg_read_sts(); - read the inbound and outbound message registers status
 ntb_msg_clear_sts(); - clear status bits of message registers
 ntb_msg_set_mask(); - mask interrupts raised by status bits of message
registers.
 ntb_msg_clear_mask(); - clear interrupts mask bits of message registers
 ntb_msg_recv(midx, *pidx); - read message register with specified index,
additionally getting peer port index which data received from
 ntb_msg_send(midx, pidx); - write data to the specified message register
sending it to the passed peer device connected over a pidx port
 ntb_msg_event(); - notify driver context of a new message event
 
7) Topology reduced to be either P2P (port-to-port) or B2B (bridge-to-bridge).
Since there is port number introduced to be part of ntb_dev structure, real
port number can be used to determine Primary and Secondary sides. Intel and AMD
driver are altered to support this novation.

8) Standard test drivers: PingPong, Debugging tool and Raw Perf as well as NTB
Transport drivers don't support multi-port devices at the moment.
Since we haven't got any real multi-port hadrware driver, it's dangerous to
make any serious alterations in the debugging tools. So I have made those
drivers to work the way they wokred before, but using the new NTB API.
The situation will change when I finish porting my current IDT NTB driver to
support new API. Then I'll be able to refactor the tools and test them using
real multi-port hardware.

The changes are made on top of the NTB-fork of the kernel:
https://github.com/jonmason/ntb
of "ntb"-branch with last commit:
9c763584b7c8911106bb77af7e648bef09af9d80 Linux 4.9-rc6

Signed-off-by: Serge Semin <fancer.lancer@gmail.com>

Serge Semin (22):
  NTB: Move link state API being first in sources
  NTB: Add peer indexed ports NTB API
  NTB: Alter NTB API to support both inbound and outbound MW based
    interfaces
  NTB: Add messaging NTB API
  NTB: Alter Scratchpads NTB API to support multi-ports interface
  NTB: Slightly alter link state NTB API
  NTB: Fix a few ntb.h issues
  NTB: Add T-Platforms copyrights to NTB API
  NTB Intel: Move link-related methods being first in the driver
  NTB Intel: Add port-related NTB API callback methods
  NTB Intel: Alter MW interface to fit new NTB API
  NTB Intel: Alter Scratchpads interface to fit new NTB API
  NTB Intel: Add T-Platforms copyrights to Intel NTB driver
  NTB AMD: Move link-related methods being first in the driver
  NTB AMD: Add port-related NTB API callback methods
  NTB AMD: Alter MW interface to fit new NTB API
  NTB AMD: Alter Scratchpads interface to fit new NTB API
  NTB AMD: Add T-Platforms copyrights to AMD NTB driver
  NTB PingPong: Alter driver to work with two-ports NTB API
  NTB Tool: Alter driver to work with two-ports NTB API
  NTB Perf: Alter driver to work with two-ports NTB API
  NTB Transport: Alter driver to work with two-ports NTB API

 drivers/ntb/hw/amd/ntb_hw_amd.c     | 310 +++++++++------
 drivers/ntb/hw/amd/ntb_hw_amd.h     |  12 +
 drivers/ntb/hw/intel/ntb_hw_intel.c | 420 ++++++++++++--------
 drivers/ntb/hw/intel/ntb_hw_intel.h |  12 +
 drivers/ntb/ntb.c                   |  15 +
 drivers/ntb/ntb_transport.c         |  43 +-
 drivers/ntb/test/ntb_perf.c         |  27 +-
 drivers/ntb/test/ntb_pingpong.c     |  11 +-
 drivers/ntb/test/ntb_tool.c         |  87 +++--
 include/linux/ntb.h                 | 753 +++++++++++++++++++++++++++++-------
 10 files changed, 1221 insertions(+), 469 deletions(-)

-- 
2.6.6

^ permalink raw reply	[flat|nested] 62+ messages in thread
* RE: [PATCH 01/22] NTB: Move link state API being first in sources
@ 2016-12-04  0:03 Allen Hubbe
  0 siblings, 0 replies; 62+ messages in thread
From: Allen Hubbe @ 2016-12-04  0:03 UTC (permalink / raw)
  To: 'Serge Semin', jdmason, dave.jiang, Xiangliang.Yu
  Cc: Sergey.Semin, linux-ntb, linux-kernel

From: Serge Semin
> Since link operations are usually performed before memory window access
> operations, it's logically better to declared link-related API before any
> other methods. Additionally it's good practice for readability to declare
> NTB device callback methods of hadrware drivers with the same order as it's
> done within ntb.h.

No harm.  Please spellcheck the description.

I think this and patch 7 can be squashed.

I plan to ack.

> Signed-off-by: Serge Semin <fancer.lancer@gmail.com>
>
> ---
>  include/linux/ntb.h | 137 ++++++++++++++++++++++++++--------------------------
>  1 file changed, 69 insertions(+), 68 deletions(-)
> 
> diff --git a/include/linux/ntb.h b/include/linux/ntb.h
> index 6f47562..5d1f260 100644
> --- a/include/linux/ntb.h
> +++ b/include/linux/ntb.h
> @@ -179,13 +179,13 @@ static inline int ntb_ctx_ops_is_valid(const struct ntb_ctx_ops
> *ops)
> 
>  /**
>   * struct ntb_ctx_ops - ntb device operations
> + * @link_is_up:		See ntb_link_is_up().
> + * @link_enable:	See ntb_link_enable().
> + * @link_disable:	See ntb_link_disable().
>   * @mw_count:		See ntb_mw_count().
>   * @mw_get_range:	See ntb_mw_get_range().
>   * @mw_set_trans:	See ntb_mw_set_trans().
>   * @mw_clear_trans:	See ntb_mw_clear_trans().
> - * @link_is_up:		See ntb_link_is_up().
> - * @link_enable:	See ntb_link_enable().
> - * @link_disable:	See ntb_link_disable().
>   * @db_is_unsafe:	See ntb_db_is_unsafe().
>   * @db_valid_mask:	See ntb_db_valid_mask().
>   * @db_vector_count:	See ntb_db_vector_count().
> @@ -212,6 +212,12 @@ static inline int ntb_ctx_ops_is_valid(const struct ntb_ctx_ops *ops)
>   * @peer_spad_write:	See ntb_peer_spad_write().
>   */
>  struct ntb_dev_ops {
> +	int (*link_is_up)(struct ntb_dev *ntb,
> +			  enum ntb_speed *speed, enum ntb_width *width);
> +	int (*link_enable)(struct ntb_dev *ntb,
> +			   enum ntb_speed max_speed, enum ntb_width max_width);
> +	int (*link_disable)(struct ntb_dev *ntb);
> +
>  	int (*mw_count)(struct ntb_dev *ntb);
>  	int (*mw_get_range)(struct ntb_dev *ntb, int idx,
>  			    phys_addr_t *base, resource_size_t *size,
> @@ -220,12 +226,6 @@ struct ntb_dev_ops {
>  			    dma_addr_t addr, resource_size_t size);
>  	int (*mw_clear_trans)(struct ntb_dev *ntb, int idx);
> 
> -	int (*link_is_up)(struct ntb_dev *ntb,
> -			  enum ntb_speed *speed, enum ntb_width *width);
> -	int (*link_enable)(struct ntb_dev *ntb,
> -			   enum ntb_speed max_speed, enum ntb_width max_width);
> -	int (*link_disable)(struct ntb_dev *ntb);
> -
>  	int (*db_is_unsafe)(struct ntb_dev *ntb);
>  	u64 (*db_valid_mask)(struct ntb_dev *ntb);
>  	int (*db_vector_count)(struct ntb_dev *ntb);
> @@ -265,13 +265,14 @@ static inline int ntb_dev_ops_is_valid(const struct ntb_dev_ops
> *ops)
>  {
>  	/* commented callbacks are not required: */
>  	return
> +		ops->link_is_up				&&
> +		ops->link_enable			&&
> +		ops->link_disable			&&
>  		ops->mw_count				&&
>  		ops->mw_get_range			&&
>  		ops->mw_set_trans			&&
>  		/* ops->mw_clear_trans			&& */
> -		ops->link_is_up				&&
> -		ops->link_enable			&&
> -		ops->link_disable			&&
> +
>  		/* ops->db_is_unsafe			&& */
>  		ops->db_valid_mask			&&
> 
> @@ -441,6 +442,62 @@ void ntb_link_event(struct ntb_dev *ntb);
>  void ntb_db_event(struct ntb_dev *ntb, int vector);
> 
>  /**
> + * ntb_link_is_up() - get the current ntb link state
> + * @ntb:	NTB device context.
> + * @speed:	OUT - The link speed expressed as PCIe generation number.
> + * @width:	OUT - The link width expressed as the number of PCIe lanes.
> + *
> + * Get the current state of the ntb link.  It is recommended to query the link
> + * state once after every link event.  It is safe to query the link state in
> + * the context of the link event callback.
> + *
> + * Return: One if the link is up, zero if the link is down, otherwise a
> + *		negative value indicating the error number.
> + */
> +static inline int ntb_link_is_up(struct ntb_dev *ntb,
> +				 enum ntb_speed *speed, enum ntb_width *width)
> +{
> +	return ntb->ops->link_is_up(ntb, speed, width);
> +}
> +
> +/**
> + * ntb_link_enable() - enable the link on the secondary side of the ntb
> + * @ntb:	NTB device context.
> + * @max_speed:	The maximum link speed expressed as PCIe generation number.
> + * @max_width:	The maximum link width expressed as the number of PCIe lanes.
> + *
> + * Enable the link on the secondary side of the ntb.  This can only be done
> + * from the primary side of the ntb in primary or b2b topology.  The ntb device
> + * should train the link to its maximum speed and width, or the requested speed
> + * and width, whichever is smaller, if supported.
> + *
> + * Return: Zero on success, otherwise an error number.
> + */
> +static inline int ntb_link_enable(struct ntb_dev *ntb,
> +				  enum ntb_speed max_speed,
> +				  enum ntb_width max_width)
> +{
> +	return ntb->ops->link_enable(ntb, max_speed, max_width);
> +}
> +
> +/**
> + * ntb_link_disable() - disable the link on the secondary side of the ntb
> + * @ntb:	NTB device context.
> + *
> + * Disable the link on the secondary side of the ntb.  This can only be
> + * done from the primary side of the ntb in primary or b2b topology.  The ntb
> + * device should disable the link.  Returning from this call must indicate that
> + * a barrier has passed, though with no more writes may pass in either
> + * direction across the link, except if this call returns an error number.
> + *
> + * Return: Zero on success, otherwise an error number.
> + */
> +static inline int ntb_link_disable(struct ntb_dev *ntb)
> +{
> +	return ntb->ops->link_disable(ntb);
> +}
> +
> +/**
>   * ntb_mw_count() - get the number of memory windows
>   * @ntb:	NTB device context.
>   *
> @@ -517,62 +574,6 @@ static inline int ntb_mw_clear_trans(struct ntb_dev *ntb, int idx)
>  }
> 
>  /**
> - * ntb_link_is_up() - get the current ntb link state
> - * @ntb:	NTB device context.
> - * @speed:	OUT - The link speed expressed as PCIe generation number.
> - * @width:	OUT - The link width expressed as the number of PCIe lanes.
> - *
> - * Get the current state of the ntb link.  It is recommended to query the link
> - * state once after every link event.  It is safe to query the link state in
> - * the context of the link event callback.
> - *
> - * Return: One if the link is up, zero if the link is down, otherwise a
> - *		negative value indicating the error number.
> - */
> -static inline int ntb_link_is_up(struct ntb_dev *ntb,
> -				 enum ntb_speed *speed, enum ntb_width *width)
> -{
> -	return ntb->ops->link_is_up(ntb, speed, width);
> -}
> -
> -/**
> - * ntb_link_enable() - enable the link on the secondary side of the ntb
> - * @ntb:	NTB device context.
> - * @max_speed:	The maximum link speed expressed as PCIe generation number.
> - * @max_width:	The maximum link width expressed as the number of PCIe lanes.
> - *
> - * Enable the link on the secondary side of the ntb.  This can only be done
> - * from the primary side of the ntb in primary or b2b topology.  The ntb device
> - * should train the link to its maximum speed and width, or the requested speed
> - * and width, whichever is smaller, if supported.
> - *
> - * Return: Zero on success, otherwise an error number.
> - */
> -static inline int ntb_link_enable(struct ntb_dev *ntb,
> -				  enum ntb_speed max_speed,
> -				  enum ntb_width max_width)
> -{
> -	return ntb->ops->link_enable(ntb, max_speed, max_width);
> -}
> -
> -/**
> - * ntb_link_disable() - disable the link on the secondary side of the ntb
> - * @ntb:	NTB device context.
> - *
> - * Disable the link on the secondary side of the ntb.  This can only be
> - * done from the primary side of the ntb in primary or b2b topology.  The ntb
> - * device should disable the link.  Returning from this call must indicate that
> - * a barrier has passed, though with no more writes may pass in either
> - * direction across the link, except if this call returns an error number.
> - *
> - * Return: Zero on success, otherwise an error number.
> - */
> -static inline int ntb_link_disable(struct ntb_dev *ntb)
> -{
> -	return ntb->ops->link_disable(ntb);
> -}
> -
> -/**
>   * ntb_db_is_unsafe() - check if it is safe to use hardware doorbell
>   * @ntb:	NTB device context.
>   *
> --
> 2.6.6

^ permalink raw reply	[flat|nested] 62+ messages in thread
end of thread, other threads:[~2017-02-01 20:01 UTC | newest]

Thread overview: 62+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2016-11-29 17:15 [PATCH 00/22] NTB: Alter kernel API to support multi-port devices Serge Semin
2016-11-29 17:15 ` [PATCH 01/22] NTB: Move link state API being first in sources Serge Semin
2016-11-29 17:15 ` [PATCH 02/22] NTB: Add peer indexed ports NTB API Serge Semin
2016-11-30 18:40   ` kbuild test robot
2016-11-30 19:12   ` kbuild test robot
2016-11-30 20:04   ` kbuild test robot
2016-11-29 17:15 ` [PATCH 03/22] NTB: Alter NTB API to support both inbound and outbound MW based interfaces Serge Semin
2016-11-30 18:54   ` kbuild test robot
2016-11-30 19:46   ` kbuild test robot
2016-11-29 17:15 ` [PATCH 04/22] NTB: Add messaging NTB API Serge Semin
2016-11-29 17:16 ` [PATCH 05/22] NTB: Alter Scratchpads NTB API to support multi-ports interface Serge Semin
2016-11-29 17:16 ` [PATCH 06/22] NTB: Slightly alter link state NTB API Serge Semin
2016-11-29 17:16 ` [PATCH 07/22] NTB: Fix a few ntb.h issues Serge Semin
2016-11-29 17:16 ` [PATCH 08/22] NTB: Add T-Platforms copyrights to NTB API Serge Semin
2016-11-29 17:16 ` [PATCH 09/22] NTB Intel: Move link-related methods being first in the driver Serge Semin
2016-11-29 17:16 ` [PATCH 10/22] NTB Intel: Add port-related NTB API callback methods Serge Semin
2016-12-07 22:56   ` Allen Hubbe
2016-11-29 17:16 ` [PATCH 11/22] NTB Intel: Alter MW interface to fit new NTB API Serge Semin
2016-11-29 17:16 ` [PATCH 12/22] NTB Intel: Alter Scratchpads " Serge Semin
2016-11-29 17:16 ` [PATCH 13/22] NTB Intel: Add T-Platforms copyrights to Intel NTB driver Serge Semin
2016-11-29 17:16 ` [PATCH 14/22] NTB AMD: Move link-related methods being first in the driver Serge Semin
2016-11-29 17:16 ` [PATCH 15/22] NTB AMD: Add port-related NTB API callback methods Serge Semin
2016-11-29 17:16 ` [PATCH 16/22] NTB AMD: Alter MW interface to fit new NTB API Serge Semin
2016-11-29 17:16 ` [PATCH 17/22] NTB AMD: Alter Scratchpads " Serge Semin
2016-11-29 17:16 ` [PATCH 18/22] NTB AMD: Add T-Platforms copyrights to AMD NTB driver Serge Semin
2016-11-29 17:16 ` [PATCH 19/22] NTB PingPong: Alter driver to work with two-ports NTB API Serge Semin
2016-11-29 17:16 ` [PATCH 20/22] NTB Tool: " Serge Semin
2016-11-29 17:16 ` [PATCH 21/22] NTB Perf: " Serge Semin
2016-11-29 17:16 ` [PATCH 22/22] NTB Transport: " Serge Semin
2016-12-12 21:08 ` [PATCH v2 0/9] NTB: Alter kernel API to support multi-port devices Serge Semin
2016-12-12 21:08   ` [PATCH v2 1/9] NTB: Make link-state API being declared first Serge Semin
2016-12-12 21:08   ` [PATCH v2 2/9] NTB: Add indexed ports NTB API Serge Semin
2016-12-12 21:08   ` [PATCH v2 3/9] NTB: Alter link-state API to support multi-port devices Serge Semin
2016-12-12 21:08   ` [PATCH v2 4/9] NTB: Alter MW API to support multi-ports devices Serge Semin
2016-12-12 21:08   ` [PATCH v2 5/9] NTB: Alter Scratchpads " Serge Semin
2016-12-12 21:08   ` [PATCH v2 6/9] NTB: Add Messaging NTB API Serge Semin
2016-12-12 21:08   ` [PATCH v2 7/9] NTB: Add new Memory Windows API documentation Serge Semin
2016-12-12 21:08   ` [PATCH v2 8/9] NTB: Add PCIe Gen4 link speed Serge Semin
2016-12-12 21:08   ` [PATCH v2 9/9] NTB: Add ntb.h comments Serge Semin
2016-12-13 23:49   ` [PATCH v3 0/9] NTB: Alter kernel API to support multi-port devices Serge Semin
2016-12-13 23:49     ` [PATCH v3 1/9] NTB: Make link-state API being declared first Serge Semin
2016-12-14  7:07       ` Allen Hubbe
2016-12-13 23:49     ` [PATCH v3 2/9] NTB: Add indexed ports NTB API Serge Semin
2016-12-14  7:07       ` Allen Hubbe
2016-12-13 23:49     ` [PATCH v3 3/9] NTB: Alter link-state API to support multi-port devices Serge Semin
2016-12-13 23:49     ` [PATCH v3 4/9] NTB: Alter MW API to support multi-ports devices Serge Semin
2016-12-14  7:08       ` Allen Hubbe
2017-01-11  0:11       ` Serge Semin
2016-12-13 23:49     ` [PATCH v3 5/9] NTB: Alter Scratchpads " Serge Semin
2016-12-14  7:08       ` Allen Hubbe
2017-01-11  0:13       ` Serge Semin
2017-02-01 20:01         ` Jon Mason
2016-12-13 23:49     ` [PATCH v3 6/9] NTB: Add Messaging NTB API Serge Semin
2016-12-20  9:48       ` Serge Semin
2016-12-13 23:49     ` [PATCH v3 7/9] NTB: Add new Memory Windows API documentation Serge Semin
2016-12-13 23:49     ` [PATCH v3 8/9] NTB: Add PCIe Gen4 link speed Serge Semin
2016-12-13 23:49     ` [PATCH v3 9/9] NTB: Add ntb.h comments Serge Semin
2016-12-14  7:09       ` Allen Hubbe
2016-12-14  7:16       ` Serge Semin
2016-12-14  7:19         ` Allen Hubbe
2016-12-20  9:50         ` Serge Semin
  -- strict thread matches above, loose matches on Subject: below --
2016-12-04  0:03 [PATCH 01/22] NTB: Move link state API being first in sources Allen Hubbe

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