* Re: [PATCH net] net: fec: fix time stamping logic after napi conversion
From: David Miller @ 2013-08-30 22:02 UTC (permalink / raw)
To: richardcochran; +Cc: netdev, Frank.Li
In-Reply-To: <22741489040b99d0c1025dcbf993fd5cfd859123.1377887138.git.richardcochran@gmail.com>
From: Richard Cochran <richardcochran@gmail.com>
Date: Fri, 30 Aug 2013 20:28:10 +0200
> Commit dc975382 "net: fec: add napi support to improve proformance"
> converted the fec driver to the napi model. However, that commit
> forgot to remove the call to skb_defer_rx_timestamp which is only
> needed in non-napi drivers.
>
> (The function napi_gro_receive eventually calls netif_receive_skb,
> which in turn calls skb_defer_rx_timestamp.)
>
> This patch should also be applied to the 3.9 and 3.10 kernels.
>
> Signed-off-by: Richard Cochran <richardcochran@gmail.com>
Applied and queued up for -stable, thanks!
^ permalink raw reply
* Re: [PATCH] net: fec: fix the error to get the previous BD entry
From: David Miller @ 2013-08-30 21:59 UTC (permalink / raw)
To: B38611; +Cc: b20596, netdev, bhutchings, l.stach
In-Reply-To: <1377837325-5232-1-git-send-email-B38611@freescale.com>
From: Fugang Duan <B38611@freescale.com>
Date: Fri, 30 Aug 2013 12:35:25 +0800
> When the current BD is the first BD, the previous BD entry
> must be the last BD, not "bdp - 1".
>
> Add BD entry check to get the previous BD entry correctly.
>
> Signed-off-by: Fugang Duan <B38611@freescale.com>
The correct fix is to put this logic into fec_enet_get_prevdesc().
With this current limitation, the function is completely useless.
^ permalink raw reply
* Re: [PATCH net] net: bridge: convert MLDv2 Query MRC into msecs_to_jiffies for max_delay
From: David Miller @ 2013-08-30 21:57 UTC (permalink / raw)
To: dborkman; +Cc: netdev, linus.luessing, hannes
In-Reply-To: <1377813305-11058-1-git-send-email-dborkman@redhat.com>
From: Daniel Borkmann <dborkman@redhat.com>
Date: Thu, 29 Aug 2013 23:55:05 +0200
> While looking into MLDv1/v2 code, I noticed that bridging code does
> not convert it's max delay into jiffies for MLDv2 messages as we do
> in core IPv6' multicast code.
>
> RFC3810, 5.1.3. Maximum Response Code says:
>
> The Maximum Response Code field specifies the maximum time allowed
> before sending a responding Report. The actual time allowed, called
> the Maximum Response Delay, is represented in units of milliseconds,
> and is derived from the Maximum Response Code as follows: [...]
>
> As we update timers that work with jiffies, we need to convert it.
>
> Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Applied and queued up for -stable, thanks.
^ permalink raw reply
* Re: [patch v2] net/fec: cleanup types in fec_get_mac()
From: David Miller @ 2013-08-30 21:54 UTC (permalink / raw)
To: dan.carpenter
Cc: grant.likely, rob.herring, fabio.estevam, Frank.Li, jim_baxter,
B38611, netdev, bhutchings, devicetree, kernel-janitors
In-Reply-To: <20130829082514.GB14334@elgon.mountain>
From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Thu, 29 Aug 2013 11:25:14 +0300
> My static checker complains that on some arches unsigned longs can be 8
> characters which is larger than the buffer is only 6 chars.
> Additionally, Ben Hutchings points out that the buffer actually holds
> big endian data and the buffer we are reading from is CPU endian.
>
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
> ---
> v2: fix endian annotations and reverse the beXX_to_cpu() calls so that
> they say cpu_to_beXX().
Applied, thanks.
^ permalink raw reply
* Re: [patch] mISDN: return -EINVAL on error in dsp_control_req()
From: David Miller @ 2013-08-30 21:53 UTC (permalink / raw)
To: dan.carpenter; +Cc: isdn, khlebnikov, netdev, kernel-janitors
In-Reply-To: <20130829084700.GF14334@elgon.mountain>
From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Thu, 29 Aug 2013 11:47:00 +0300
> If skb->len is too short then we should return an error. Otherwise we
> read beyond the end of skb->data for several bytes.
>
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Applied, thanks.
^ permalink raw reply
* [PATCH v3 11/11] net: calxedaxgmac: fix xgmac_xmit DMA mapping error handling
From: Rob Herring @ 2013-08-30 21:49 UTC (permalink / raw)
To: netdev; +Cc: Ben Hutchings, Lennert Buytenhek, Rob Herring
In-Reply-To: <1377899369-23252-1-git-send-email-robherring2@gmail.com>
From: Rob Herring <rob.herring@calxeda.com>
On a DMA mapping error in xgmac_xmit, we should simply free the skb and
return NETDEV_TX_OK rather than -EIO. In the case of errors in mapping
frags, we need to undo everything that has been setup.
Reported-by: Andreas Herrmann <andreas.herrmann@calxeda.com>
Signed-off-by: Rob Herring <rob.herring@calxeda.com>
---
drivers/net/ethernet/calxeda/xgmac.c | 31 ++++++++++++++++++++++++++-----
1 file changed, 26 insertions(+), 5 deletions(-)
diff --git a/drivers/net/ethernet/calxeda/xgmac.c b/drivers/net/ethernet/calxeda/xgmac.c
index cd5010b..78d6d6b 100644
--- a/drivers/net/ethernet/calxeda/xgmac.c
+++ b/drivers/net/ethernet/calxeda/xgmac.c
@@ -466,6 +466,13 @@ static inline void desc_set_tx_owner(struct xgmac_dma_desc *p, u32 flags)
p->flags = cpu_to_le32(tmpflags);
}
+static inline void desc_clear_tx_owner(struct xgmac_dma_desc *p)
+{
+ u32 tmpflags = le32_to_cpu(p->flags);
+ tmpflags &= TXDESC_END_RING;
+ p->flags = cpu_to_le32(tmpflags);
+}
+
static inline int desc_get_tx_ls(struct xgmac_dma_desc *p)
{
return le32_to_cpu(p->flags) & TXDESC_LAST_SEG;
@@ -1100,7 +1107,7 @@ static netdev_tx_t xgmac_xmit(struct sk_buff *skb, struct net_device *dev)
paddr = dma_map_single(priv->device, skb->data, len, DMA_TO_DEVICE);
if (dma_mapping_error(priv->device, paddr)) {
dev_kfree_skb(skb);
- return -EIO;
+ return NETDEV_TX_OK;
}
priv->tx_skbuff[entry] = skb;
desc_set_buf_addr_and_size(desc, paddr, len);
@@ -1112,10 +1119,8 @@ static netdev_tx_t xgmac_xmit(struct sk_buff *skb, struct net_device *dev)
paddr = skb_frag_dma_map(priv->device, frag, 0, len,
DMA_TO_DEVICE);
- if (dma_mapping_error(priv->device, paddr)) {
- dev_kfree_skb(skb);
- return -EIO;
- }
+ if (dma_mapping_error(priv->device, paddr))
+ goto dma_err;
entry = dma_ring_incr(entry, DMA_TX_RING_SZ);
desc = priv->dma_tx + entry;
@@ -1151,6 +1156,22 @@ static netdev_tx_t xgmac_xmit(struct sk_buff *skb, struct net_device *dev)
netif_start_queue(dev);
}
return NETDEV_TX_OK;
+
+dma_err:
+ entry = priv->tx_head;
+ for ( ; i > 0; i--) {
+ entry = dma_ring_incr(entry, DMA_TX_RING_SZ);
+ desc = priv->dma_tx + entry;
+ priv->tx_skbuff[entry] = NULL;
+ dma_unmap_page(priv->device, desc_get_buf_addr(desc),
+ desc_get_buf_len(desc), DMA_TO_DEVICE);
+ desc_clear_tx_owner(desc);
+ }
+ desc = first;
+ dma_unmap_single(priv->device, desc_get_buf_addr(desc),
+ desc_get_buf_len(desc), DMA_TO_DEVICE);
+ dev_kfree_skb(skb);
+ return NETDEV_TX_OK;
}
static int xgmac_rx(struct xgmac_priv *priv, int limit)
--
1.8.1.2
^ permalink raw reply related
* [PATCH v3 08/11] net: calxedaxgmac: fix various errors in xgmac_set_rx_mode
From: Rob Herring @ 2013-08-30 21:49 UTC (permalink / raw)
To: netdev; +Cc: Ben Hutchings, Lennert Buytenhek, Rob Herring
In-Reply-To: <1377899369-23252-1-git-send-email-robherring2@gmail.com>
From: Rob Herring <rob.herring@calxeda.com>
Fix xgmac_set_rx_mode to handle several conditions that were not handled
correctly as Lennert Buytenhek describes:
If we have, say, 100 unicast addresses, and 5 multicast addresses, the
unicast address count check will evaluate to true, and set use_hash to
true. The multicast address check will however evaluate to false, and
use_hash won't be set to true again, and XGMAC_FRAME_FILTER_HMC won't
be OR'd into XGMAC_FRAME_FILTER, but since use_hash was still true
from the unicast check, netdev_for_each_mc_addr() will program the
multicast addresses into the hash table instead of using the MAC
address registers, but since the HMC bit wasn't set, the hash table
won't be checked for multicast addresses on receive, and we'll stop
receiving multicast packets entirely.
Also, there is no code that zeroes out MAC address registers reg..31
at the end of this function, meaning that under the right conditions,
unicast/multicast addresses that were previously in the filter but
were then deleted won't be cleared out.
Reported-by: Lennert Buytenhek <buytenh@wantstofly.org>
Signed-off-by: Rob Herring <rob.herring@calxeda.com>
---
drivers/net/ethernet/calxeda/xgmac.c | 17 +++++++++++++----
1 file changed, 13 insertions(+), 4 deletions(-)
diff --git a/drivers/net/ethernet/calxeda/xgmac.c b/drivers/net/ethernet/calxeda/xgmac.c
index 73d3f83..0cff9e3 100644
--- a/drivers/net/ethernet/calxeda/xgmac.c
+++ b/drivers/net/ethernet/calxeda/xgmac.c
@@ -618,10 +618,15 @@ static void xgmac_set_mac_addr(void __iomem *ioaddr, unsigned char *addr,
{
u32 data;
- data = (addr[5] << 8) | addr[4] | (num ? XGMAC_ADDR_AE : 0);
- writel(data, ioaddr + XGMAC_ADDR_HIGH(num));
- data = (addr[3] << 24) | (addr[2] << 16) | (addr[1] << 8) | addr[0];
- writel(data, ioaddr + XGMAC_ADDR_LOW(num));
+ if (addr) {
+ data = (addr[5] << 8) | addr[4] | (num ? XGMAC_ADDR_AE : 0);
+ writel(data, ioaddr + XGMAC_ADDR_HIGH(num));
+ data = (addr[3] << 24) | (addr[2] << 16) | (addr[1] << 8) | addr[0];
+ writel(data, ioaddr + XGMAC_ADDR_LOW(num));
+ } else {
+ writel(0, ioaddr + XGMAC_ADDR_HIGH(num));
+ writel(0, ioaddr + XGMAC_ADDR_LOW(num));
+ }
}
static void xgmac_get_mac_addr(void __iomem *ioaddr, unsigned char *addr,
@@ -1294,6 +1299,8 @@ static void xgmac_set_rx_mode(struct net_device *dev)
if ((netdev_mc_count(dev) + reg - 1) > XGMAC_MAX_FILTER_ADDR) {
use_hash = true;
value |= XGMAC_FRAME_FILTER_HMC | XGMAC_FRAME_FILTER_HPF;
+ } else {
+ use_hash = false;
}
netdev_for_each_mc_addr(ha, dev) {
if (use_hash) {
@@ -1310,6 +1317,8 @@ static void xgmac_set_rx_mode(struct net_device *dev)
}
out:
+ for (i = reg; i < XGMAC_MAX_FILTER_ADDR; i++)
+ xgmac_set_mac_addr(ioaddr, NULL, reg);
for (i = 0; i < XGMAC_NUM_HASH; i++)
writel(hash_filter[i], ioaddr + XGMAC_HASH(i));
--
1.8.1.2
^ permalink raw reply related
* [PATCH v3 10/11] net: calxedaxgmac: fix rx DMA mapping API size mismatches
From: Rob Herring @ 2013-08-30 21:49 UTC (permalink / raw)
To: netdev; +Cc: Ben Hutchings, Lennert Buytenhek, Rob Herring
In-Reply-To: <1377899369-23252-1-git-send-email-robherring2@gmail.com>
From: Rob Herring <rob.herring@calxeda.com>
Fix the mismatch in the DMA mapping and unmapping sizes for receive. The
unmap size must be equal to the map size and should not be the actual
received frame length. The map size should also be adjusted by the
NET_IP_ALIGN size since the h/w buffer size (dma_buf_sz) includes this
offset.
Also, add a missing dma_mapping_error check in xgmac_rx_refill.
Reported-by: Lennert Buytenhek <buytenh@wantstofly.org>
Signed-off-by: Rob Herring <rob.herring@calxeda.com>
---
drivers/net/ethernet/calxeda/xgmac.c | 18 ++++++++++++------
1 file changed, 12 insertions(+), 6 deletions(-)
diff --git a/drivers/net/ethernet/calxeda/xgmac.c b/drivers/net/ethernet/calxeda/xgmac.c
index 04c585c..cd5010b 100644
--- a/drivers/net/ethernet/calxeda/xgmac.c
+++ b/drivers/net/ethernet/calxeda/xgmac.c
@@ -695,9 +695,14 @@ static void xgmac_rx_refill(struct xgmac_priv *priv)
if (unlikely(skb == NULL))
break;
- priv->rx_skbuff[entry] = skb;
paddr = dma_map_single(priv->device, skb->data,
- bufsz, DMA_FROM_DEVICE);
+ priv->dma_buf_sz - NET_IP_ALIGN,
+ DMA_FROM_DEVICE);
+ if (dma_mapping_error(priv->device, paddr)) {
+ dev_kfree_skb_any(skb);
+ break;
+ }
+ priv->rx_skbuff[entry] = skb;
desc_set_buf_addr(p, paddr, priv->dma_buf_sz);
}
@@ -794,13 +799,14 @@ static void xgmac_free_rx_skbufs(struct xgmac_priv *priv)
return;
for (i = 0; i < DMA_RX_RING_SZ; i++) {
- if (priv->rx_skbuff[i] == NULL)
+ struct sk_buff *skb = priv->rx_skbuff[i];
+ if (skb == NULL)
continue;
p = priv->dma_rx + i;
dma_unmap_single(priv->device, desc_get_buf_addr(p),
- priv->dma_buf_sz, DMA_FROM_DEVICE);
- dev_kfree_skb_any(priv->rx_skbuff[i]);
+ priv->dma_buf_sz - NET_IP_ALIGN, DMA_FROM_DEVICE);
+ dev_kfree_skb_any(skb);
priv->rx_skbuff[i] = NULL;
}
}
@@ -1187,7 +1193,7 @@ static int xgmac_rx(struct xgmac_priv *priv, int limit)
skb_put(skb, frame_len);
dma_unmap_single(priv->device, desc_get_buf_addr(p),
- frame_len, DMA_FROM_DEVICE);
+ priv->dma_buf_sz - NET_IP_ALIGN, DMA_FROM_DEVICE);
skb->protocol = eth_type_trans(skb, priv->dev);
skb->ip_summed = ip_checksum;
--
1.8.1.2
^ permalink raw reply related
* [PATCH v3 09/11] net: calxedaxgmac: remove some unused statistic counters
From: Rob Herring @ 2013-08-30 21:49 UTC (permalink / raw)
To: netdev; +Cc: Ben Hutchings, Lennert Buytenhek, Rob Herring
In-Reply-To: <1377899369-23252-1-git-send-email-robherring2@gmail.com>
From: Rob Herring <rob.herring@calxeda.com>
rx_sa_filter_fail and tx_undeflow events are unused and impossible
to occur based on how the h/w is used. We never filter on source MAC
address and TX store and forward mode prevents underflow events.
Reported-by: Lennert Buytenhek <buytenh@wantstofly.org>
Signed-off-by: Rob Herring <rob.herring@calxeda.com>
---
drivers/net/ethernet/calxeda/xgmac.c | 3 ---
1 file changed, 3 deletions(-)
diff --git a/drivers/net/ethernet/calxeda/xgmac.c b/drivers/net/ethernet/calxeda/xgmac.c
index 0cff9e3..04c585c 100644
--- a/drivers/net/ethernet/calxeda/xgmac.c
+++ b/drivers/net/ethernet/calxeda/xgmac.c
@@ -353,11 +353,9 @@ struct xgmac_extra_stats {
/* Receive errors */
unsigned long rx_watchdog;
unsigned long rx_da_filter_fail;
- unsigned long rx_sa_filter_fail;
unsigned long rx_payload_error;
unsigned long rx_ip_header_error;
/* Tx/Rx IRQ errors */
- unsigned long tx_undeflow;
unsigned long tx_process_stopped;
unsigned long rx_buf_unav;
unsigned long rx_process_stopped;
@@ -1581,7 +1579,6 @@ static const struct xgmac_stats xgmac_gstrings_stats[] = {
XGMAC_STAT(rx_payload_error),
XGMAC_STAT(rx_ip_header_error),
XGMAC_STAT(rx_da_filter_fail),
- XGMAC_STAT(rx_sa_filter_fail),
XGMAC_STAT(fatal_bus_error),
XGMAC_HW_STAT(rx_watchdog, XGMAC_MMC_RXWATCHDOG),
XGMAC_HW_STAT(tx_vlan, XGMAC_MMC_TXVLANFRAME),
--
1.8.1.2
^ permalink raw reply related
* [PATCH v3 07/11] net: calxedaxgmac: enable interrupts after napi_enable
From: Rob Herring @ 2013-08-30 21:49 UTC (permalink / raw)
To: netdev; +Cc: Ben Hutchings, Lennert Buytenhek, Rob Herring
In-Reply-To: <1377899369-23252-1-git-send-email-robherring2@gmail.com>
From: Rob Herring <rob.herring@calxeda.com>
Fix a race condition where the interrupt handler may have called
napi_schedule before napi_enable is called. This would disable interrupts
and never actually schedule napi to run.
Reported-by: Lennert Buytenhek <buytenh@wantstofly.org>
Signed-off-by: Rob Herring <rob.herring@calxeda.com>
---
drivers/net/ethernet/calxeda/xgmac.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/drivers/net/ethernet/calxeda/xgmac.c b/drivers/net/ethernet/calxeda/xgmac.c
index 5d0b61a..73d3f83 100644
--- a/drivers/net/ethernet/calxeda/xgmac.c
+++ b/drivers/net/ethernet/calxeda/xgmac.c
@@ -959,9 +959,7 @@ static int xgmac_hw_init(struct net_device *dev)
DMA_BUS_MODE_FB | DMA_BUS_MODE_ATDS | DMA_BUS_MODE_AAL;
writel(value, ioaddr + XGMAC_DMA_BUS_MODE);
- /* Enable interrupts */
- writel(DMA_INTR_DEFAULT_MASK, ioaddr + XGMAC_DMA_STATUS);
- writel(DMA_INTR_DEFAULT_MASK, ioaddr + XGMAC_DMA_INTR_ENA);
+ writel(0, ioaddr + XGMAC_DMA_INTR_ENA);
/* Mask power mgt interrupt */
writel(XGMAC_INT_STAT_PMTIM, ioaddr + XGMAC_INT_STAT);
@@ -1029,6 +1027,10 @@ static int xgmac_open(struct net_device *dev)
napi_enable(&priv->napi);
netif_start_queue(dev);
+ /* Enable interrupts */
+ writel(DMA_INTR_DEFAULT_MASK, ioaddr + XGMAC_DMA_STATUS);
+ writel(DMA_INTR_DEFAULT_MASK, ioaddr + XGMAC_DMA_INTR_ENA);
+
return 0;
}
--
1.8.1.2
^ permalink raw reply related
* [PATCH v3 05/11] net: calxedaxgmac: update ring buffer tx_head after barriers
From: Rob Herring @ 2013-08-30 21:49 UTC (permalink / raw)
To: netdev; +Cc: Ben Hutchings, Lennert Buytenhek, Rob Herring
In-Reply-To: <1377899369-23252-1-git-send-email-robherring2@gmail.com>
From: Rob Herring <rob.herring@calxeda.com>
Ensure that the descriptor writes are visible before the ring buffer head
is updated. Since writel is a barrier, we can simply update the head after
the writel.
Reported-by: Lennert Buytenhek <buytenh@wantstofly.org>
Signed-off-by: Rob Herring <rob.herring@calxeda.com>
---
drivers/net/ethernet/calxeda/xgmac.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/calxeda/xgmac.c b/drivers/net/ethernet/calxeda/xgmac.c
index 64854ad..f630855 100644
--- a/drivers/net/ethernet/calxeda/xgmac.c
+++ b/drivers/net/ethernet/calxeda/xgmac.c
@@ -1121,9 +1121,10 @@ static netdev_tx_t xgmac_xmit(struct sk_buff *skb, struct net_device *dev)
wmb();
desc_set_tx_owner(first, desc_flags | TXDESC_FIRST_SEG);
+ writel(1, priv->base + XGMAC_DMA_TX_POLL);
+
priv->tx_head = dma_ring_incr(entry, DMA_TX_RING_SZ);
- writel(1, priv->base + XGMAC_DMA_TX_POLL);
if (dma_ring_space(priv->tx_head, priv->tx_tail, DMA_TX_RING_SZ) <
MAX_SKB_FRAGS)
netif_stop_queue(dev);
--
1.8.1.2
^ permalink raw reply related
* [PATCH v3 06/11] net: calxedaxgmac: fix race with tx queue stop/wake
From: Rob Herring @ 2013-08-30 21:49 UTC (permalink / raw)
To: netdev; +Cc: Ben Hutchings, Lennert Buytenhek, Rob Herring
In-Reply-To: <1377899369-23252-1-git-send-email-robherring2@gmail.com>
From: Rob Herring <rob.herring@calxeda.com>
Since the xgmac transmit start and completion work locklessly, it is
possible for xgmac_xmit to stop the tx queue after the xgmac_tx_complete
has run resulting in the tx queue never being woken up. Fix this by
ensuring that ring buffer index updates are visible and recheck the ring
space after stopping the queue. Also fix an off-by-one bug where we need
to stop the queue when the ring buffer space is equal to MAX_SKB_FRAGS.
The implementation used here was copied from
drivers/net/ethernet/broadcom/tg3.c.
Signed-off-by: Rob Herring <rob.herring@calxeda.com>
---
v3:
- Fix off-by-one bug in queue stopping
v2:
- drop netif_tx_lock
- use netif_start_queue instead of netif_wake_queue
drivers/net/ethernet/calxeda/xgmac.c | 20 +++++++++++++++-----
1 file changed, 15 insertions(+), 5 deletions(-)
diff --git a/drivers/net/ethernet/calxeda/xgmac.c b/drivers/net/ethernet/calxeda/xgmac.c
index f630855..5d0b61a 100644
--- a/drivers/net/ethernet/calxeda/xgmac.c
+++ b/drivers/net/ethernet/calxeda/xgmac.c
@@ -410,6 +410,9 @@ struct xgmac_priv {
#define dma_ring_space(h, t, s) CIRC_SPACE(h, t, s)
#define dma_ring_cnt(h, t, s) CIRC_CNT(h, t, s)
+#define tx_dma_ring_space(p) \
+ dma_ring_space((p)->tx_head, (p)->tx_tail, DMA_TX_RING_SZ)
+
/* XGMAC Descriptor Access Helpers */
static inline void desc_set_buf_len(struct xgmac_dma_desc *p, u32 buf_sz)
{
@@ -886,8 +889,10 @@ static void xgmac_tx_complete(struct xgmac_priv *priv)
priv->tx_tail = dma_ring_incr(entry, DMA_TX_RING_SZ);
}
- if (dma_ring_space(priv->tx_head, priv->tx_tail, DMA_TX_RING_SZ) >
- MAX_SKB_FRAGS)
+ /* Ensure tx_tail is visible to xgmac_xmit */
+ smp_mb();
+ if (unlikely(netif_queue_stopped(priv->dev) &&
+ (tx_dma_ring_space(priv) > MAX_SKB_FRAGS)))
netif_wake_queue(priv->dev);
}
@@ -1125,10 +1130,15 @@ static netdev_tx_t xgmac_xmit(struct sk_buff *skb, struct net_device *dev)
priv->tx_head = dma_ring_incr(entry, DMA_TX_RING_SZ);
- if (dma_ring_space(priv->tx_head, priv->tx_tail, DMA_TX_RING_SZ) <
- MAX_SKB_FRAGS)
+ /* Ensure tx_head update is visible to tx completion */
+ smp_mb();
+ if (unlikely(tx_dma_ring_space(priv) <= MAX_SKB_FRAGS)) {
netif_stop_queue(dev);
-
+ /* Ensure netif_stop_queue is visible to tx completion */
+ smp_mb();
+ if (tx_dma_ring_space(priv) > MAX_SKB_FRAGS)
+ netif_start_queue(dev);
+ }
return NETDEV_TX_OK;
}
--
1.8.1.2
^ permalink raw reply related
* [PATCH v3 04/11] net: calxedaxgmac: fix possible skb free before tx complete
From: Rob Herring @ 2013-08-30 21:49 UTC (permalink / raw)
To: netdev; +Cc: Ben Hutchings, Lennert Buytenhek, Rob Herring
In-Reply-To: <1377899369-23252-1-git-send-email-robherring2@gmail.com>
From: Rob Herring <rob.herring@calxeda.com>
The TX completion code may have freed an skb before the entire sg list
was transmitted. The DMA unmap calls for the fragments could also get
skipped. Now set the skb pointer on every entry in the ring, not just
the head of the sg list. We then use the FS (first segment) bit in the
descriptors to determine skb head vs. fragment.
This also fixes similar bug in xgmac_free_tx_skbufs where clean-up of
a sg list that wraps at the end of the ring buffer would not get
unmapped.
Signed-off-by: Rob Herring <rob.herring@calxeda.com>
---
drivers/net/ethernet/calxeda/xgmac.c | 55 ++++++++++++++++--------------------
1 file changed, 24 insertions(+), 31 deletions(-)
diff --git a/drivers/net/ethernet/calxeda/xgmac.c b/drivers/net/ethernet/calxeda/xgmac.c
index df7e3e2..64854ad 100644
--- a/drivers/net/ethernet/calxeda/xgmac.c
+++ b/drivers/net/ethernet/calxeda/xgmac.c
@@ -470,6 +470,11 @@ static inline int desc_get_tx_ls(struct xgmac_dma_desc *p)
return le32_to_cpu(p->flags) & TXDESC_LAST_SEG;
}
+static inline int desc_get_tx_fs(struct xgmac_dma_desc *p)
+{
+ return le32_to_cpu(p->flags) & TXDESC_FIRST_SEG;
+}
+
static inline u32 desc_get_buf_addr(struct xgmac_dma_desc *p)
{
return le32_to_cpu(p->buf1_addr);
@@ -796,7 +801,7 @@ static void xgmac_free_rx_skbufs(struct xgmac_priv *priv)
static void xgmac_free_tx_skbufs(struct xgmac_priv *priv)
{
- int i, f;
+ int i;
struct xgmac_dma_desc *p;
if (!priv->tx_skbuff)
@@ -807,16 +812,15 @@ static void xgmac_free_tx_skbufs(struct xgmac_priv *priv)
continue;
p = priv->dma_tx + i;
- dma_unmap_single(priv->device, desc_get_buf_addr(p),
- desc_get_buf_len(p), DMA_TO_DEVICE);
-
- for (f = 0; f < skb_shinfo(priv->tx_skbuff[i])->nr_frags; f++) {
- p = priv->dma_tx + i++;
+ if (desc_get_tx_fs(p))
+ dma_unmap_single(priv->device, desc_get_buf_addr(p),
+ desc_get_buf_len(p), DMA_TO_DEVICE);
+ else
dma_unmap_page(priv->device, desc_get_buf_addr(p),
desc_get_buf_len(p), DMA_TO_DEVICE);
- }
- dev_kfree_skb_any(priv->tx_skbuff[i]);
+ if (desc_get_tx_ls(p))
+ dev_kfree_skb_any(priv->tx_skbuff[i]);
priv->tx_skbuff[i] = NULL;
}
}
@@ -853,8 +857,6 @@ static void xgmac_free_dma_desc_rings(struct xgmac_priv *priv)
*/
static void xgmac_tx_complete(struct xgmac_priv *priv)
{
- int i;
-
while (dma_ring_cnt(priv->tx_head, priv->tx_tail, DMA_TX_RING_SZ)) {
unsigned int entry = priv->tx_tail;
struct sk_buff *skb = priv->tx_skbuff[entry];
@@ -864,33 +866,24 @@ static void xgmac_tx_complete(struct xgmac_priv *priv)
if (desc_get_owner(p))
break;
- /* Verify tx error by looking at the last segment */
- if (desc_get_tx_ls(p))
- desc_get_tx_status(priv, p);
-
netdev_dbg(priv->dev, "tx ring: curr %d, dirty %d\n",
priv->tx_head, priv->tx_tail);
- dma_unmap_single(priv->device, desc_get_buf_addr(p),
- desc_get_buf_len(p), DMA_TO_DEVICE);
-
- priv->tx_skbuff[entry] = NULL;
- priv->tx_tail = dma_ring_incr(entry, DMA_TX_RING_SZ);
-
- if (!skb) {
- continue;
- }
-
- for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
- entry = priv->tx_tail = dma_ring_incr(priv->tx_tail,
- DMA_TX_RING_SZ);
- p = priv->dma_tx + priv->tx_tail;
-
+ if (desc_get_tx_fs(p))
+ dma_unmap_single(priv->device, desc_get_buf_addr(p),
+ desc_get_buf_len(p), DMA_TO_DEVICE);
+ else
dma_unmap_page(priv->device, desc_get_buf_addr(p),
desc_get_buf_len(p), DMA_TO_DEVICE);
+
+ /* Check tx error on the last segment */
+ if (desc_get_tx_ls(p)) {
+ desc_get_tx_status(priv, p);
+ dev_kfree_skb(skb);
}
- dev_kfree_skb(skb);
+ priv->tx_skbuff[entry] = NULL;
+ priv->tx_tail = dma_ring_incr(entry, DMA_TX_RING_SZ);
}
if (dma_ring_space(priv->tx_head, priv->tx_tail, DMA_TX_RING_SZ) >
@@ -1110,7 +1103,7 @@ static netdev_tx_t xgmac_xmit(struct sk_buff *skb, struct net_device *dev)
entry = dma_ring_incr(entry, DMA_TX_RING_SZ);
desc = priv->dma_tx + entry;
- priv->tx_skbuff[entry] = NULL;
+ priv->tx_skbuff[entry] = skb;
desc_set_buf_addr_and_size(desc, paddr, len);
if (i < (nfrags - 1))
--
1.8.1.2
^ permalink raw reply related
* [PATCH v3 03/11] net: calxedaxgmac: fix race between xgmac_tx_complete and xgmac_tx_err
From: Rob Herring @ 2013-08-30 21:49 UTC (permalink / raw)
To: netdev; +Cc: Ben Hutchings, Lennert Buytenhek, Rob Herring
In-Reply-To: <1377899369-23252-1-git-send-email-robherring2@gmail.com>
From: Rob Herring <rob.herring@calxeda.com>
It is possible for the xgmac_tx_complete to run concurrently with
xgmac_tx_err since there are no locks. Fix this by moving the tx
error handling to a workqueue so we can disable napi while we reset
the transmitter.
Reported-by: Andreas Herrmann <andreas.herrmann@calxeda.com>
Signed-off-by: Rob Herring <rob.herring@calxeda.com>
---
drivers/net/ethernet/calxeda/xgmac.c | 38 +++++++++++++++++-------------------
1 file changed, 18 insertions(+), 20 deletions(-)
diff --git a/drivers/net/ethernet/calxeda/xgmac.c b/drivers/net/ethernet/calxeda/xgmac.c
index d41af68..df7e3e2 100644
--- a/drivers/net/ethernet/calxeda/xgmac.c
+++ b/drivers/net/ethernet/calxeda/xgmac.c
@@ -393,6 +393,7 @@ struct xgmac_priv {
char rx_pause;
char tx_pause;
int wolopts;
+ struct work_struct tx_timeout_work;
};
/* XGMAC Configuration Settings */
@@ -897,21 +898,18 @@ static void xgmac_tx_complete(struct xgmac_priv *priv)
netif_wake_queue(priv->dev);
}
-/**
- * xgmac_tx_err:
- * @priv: pointer to the private device structure
- * Description: it cleans the descriptors and restarts the transmission
- * in case of errors.
- */
-static void xgmac_tx_err(struct xgmac_priv *priv)
+static void xgmac_tx_timeout_work(struct work_struct *work)
{
- u32 reg, value, inten;
+ u32 reg, value;
+ struct xgmac_priv *priv =
+ container_of(work, struct xgmac_priv, tx_timeout_work);
- netif_stop_queue(priv->dev);
+ napi_disable(&priv->napi);
- inten = readl(priv->base + XGMAC_DMA_INTR_ENA);
writel(0, priv->base + XGMAC_DMA_INTR_ENA);
+ netif_tx_lock(priv->dev);
+
reg = readl(priv->base + XGMAC_DMA_CONTROL);
writel(reg & ~DMA_CONTROL_ST, priv->base + XGMAC_DMA_CONTROL);
do {
@@ -927,9 +925,15 @@ static void xgmac_tx_err(struct xgmac_priv *priv)
writel(DMA_STATUS_TU | DMA_STATUS_TPS | DMA_STATUS_NIS | DMA_STATUS_AIS,
priv->base + XGMAC_DMA_STATUS);
- writel(inten, priv->base + XGMAC_DMA_INTR_ENA);
+ netif_tx_unlock(priv->dev);
netif_wake_queue(priv->dev);
+
+ napi_enable(&priv->napi);
+
+ /* Enable interrupts */
+ writel(DMA_INTR_DEFAULT_MASK, priv->base + XGMAC_DMA_STATUS);
+ writel(DMA_INTR_DEFAULT_MASK, priv->base + XGMAC_DMA_INTR_ENA);
}
static int xgmac_hw_init(struct net_device *dev)
@@ -1225,9 +1229,7 @@ static int xgmac_poll(struct napi_struct *napi, int budget)
static void xgmac_tx_timeout(struct net_device *dev)
{
struct xgmac_priv *priv = netdev_priv(dev);
-
- /* Clear Tx resources and restart transmitting again */
- xgmac_tx_err(priv);
+ schedule_work(&priv->tx_timeout_work);
}
/**
@@ -1366,7 +1368,6 @@ static irqreturn_t xgmac_pmt_interrupt(int irq, void *dev_id)
static irqreturn_t xgmac_interrupt(int irq, void *dev_id)
{
u32 intr_status;
- bool tx_err = false;
struct net_device *dev = (struct net_device *)dev_id;
struct xgmac_priv *priv = netdev_priv(dev);
struct xgmac_extra_stats *x = &priv->xstats;
@@ -1396,16 +1397,12 @@ static irqreturn_t xgmac_interrupt(int irq, void *dev_id)
if (intr_status & DMA_STATUS_TPS) {
netdev_err(priv->dev, "transmit process stopped\n");
x->tx_process_stopped++;
- tx_err = true;
+ schedule_work(&priv->tx_timeout_work);
}
if (intr_status & DMA_STATUS_FBI) {
netdev_err(priv->dev, "fatal bus error\n");
x->fatal_bus_error++;
- tx_err = true;
}
-
- if (tx_err)
- xgmac_tx_err(priv);
}
/* TX/RX NORMAL interrupts */
@@ -1708,6 +1705,7 @@ static int xgmac_probe(struct platform_device *pdev)
ndev->netdev_ops = &xgmac_netdev_ops;
SET_ETHTOOL_OPS(ndev, &xgmac_ethtool_ops);
spin_lock_init(&priv->stats_lock);
+ INIT_WORK(&priv->tx_timeout_work, xgmac_tx_timeout_work);
priv->device = &pdev->dev;
priv->dev = ndev;
--
1.8.1.2
^ permalink raw reply related
* [PATCH v3 02/11] net: calxedaxgmac: read correct field in xgmac_desc_get_buf_len
From: Rob Herring @ 2013-08-30 21:49 UTC (permalink / raw)
To: netdev; +Cc: Ben Hutchings, Lennert Buytenhek, Rob Herring
In-Reply-To: <1377899369-23252-1-git-send-email-robherring2@gmail.com>
From: Rob Herring <rob.herring@calxeda.com>
xgmac_desc_get_buf_len appears to have a copy/paste error. flags is the
wrong field to read. We should be reading buf_size field. cpu_to_le32
should also be le32_to_cpu. This never really mattered as this function
is only used for DMA mapping calls which happen to be nops with coherent
DMA.
Signed-off-by: Rob Herring <rob.herring@calxeda.com>
---
drivers/net/ethernet/calxeda/xgmac.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/calxeda/xgmac.c b/drivers/net/ethernet/calxeda/xgmac.c
index 71f6720..d41af68 100644
--- a/drivers/net/ethernet/calxeda/xgmac.c
+++ b/drivers/net/ethernet/calxeda/xgmac.c
@@ -421,7 +421,7 @@ static inline void desc_set_buf_len(struct xgmac_dma_desc *p, u32 buf_sz)
static inline int desc_get_buf_len(struct xgmac_dma_desc *p)
{
- u32 len = cpu_to_le32(p->flags);
+ u32 len = le32_to_cpu(p->buf_size);
return (len & DESC_BUFFER1_SZ_MASK) +
((len & DESC_BUFFER2_SZ_MASK) >> DESC_BUFFER2_SZ_OFFSET);
}
--
1.8.1.2
^ permalink raw reply related
* [PATCH v3 01/11] net: calxedaxgmac: remove NETIF_F_FRAGLIST setting
From: Rob Herring @ 2013-08-30 21:49 UTC (permalink / raw)
To: netdev; +Cc: Ben Hutchings, Lennert Buytenhek, Rob Herring
From: Rob Herring <rob.herring@calxeda.com>
The xgmac does not actually handle frag lists, so this option should not
be set. It does not appear to have had any impact though.
Reported-by: Lennert Buytenhek <buytenh@wantstofly.org>
Signed-off-by: Rob Herring <rob.herring@calxeda.com>
---
drivers/net/ethernet/calxeda/xgmac.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/calxeda/xgmac.c b/drivers/net/ethernet/calxeda/xgmac.c
index 7cb148c..71f6720 100644
--- a/drivers/net/ethernet/calxeda/xgmac.c
+++ b/drivers/net/ethernet/calxeda/xgmac.c
@@ -1759,7 +1759,7 @@ static int xgmac_probe(struct platform_device *pdev)
if (device_can_wakeup(priv->device))
priv->wolopts = WAKE_MAGIC; /* Magic Frame as default */
- ndev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA;
+ ndev->hw_features = NETIF_F_SG | NETIF_F_HIGHDMA;
if (readl(priv->base + XGMAC_DMA_HW_FEATURE) & DMA_HW_FEAT_TXCOESEL)
ndev->hw_features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
NETIF_F_RXCSUM;
--
1.8.1.2
^ permalink raw reply related
* Re: [PATCH] net: revert 8728c544a9c ("net: dev_pick_tx() fix")
From: David Miller @ 2013-08-30 21:48 UTC (permalink / raw)
To: eric.dumazet; +Cc: netdev, alexander.h.duyck, xii, therbert, nuclearcat
In-Reply-To: <1377738643.8277.25.camel@edumazet-glaptop>
From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Wed, 28 Aug 2013 18:10:43 -0700
> From: Eric Dumazet <edumazet@google.com>
>
> commit 8728c544a9cbdc ("net: dev_pick_tx() fix") and commit
> b6fe83e9525a ("bonding: refine IFF_XMIT_DST_RELEASE capability")
> are quite incompatible : Queue selection is disabled because skb
> dst was dropped before entering bonding device.
>
> This causes major performance regression, mainly because TCP packets
> for a given flow can be sent to multiple queues.
>
> This is particularly visible when using the new FQ packet scheduler
> with MQ + FQ setup on the slaves.
>
> We can safely revert the first commit now that 416186fbf8c5b
> ("net: Split core bits of netdev_pick_tx into __netdev_pick_tx")
> properly caps the queue_index.
>
> Reported-by: Xi Wang <xii@google.com>
> Diagnosed-by: Xi Wang <xii@google.com>
> Signed-off-by: Eric Dumazet <edumazet@google.com>
Applied, thanks Eric.
^ permalink raw reply
* Re: [PATCH 01/31] net: ax88796: use dev_get_platdata()
From: David Miller @ 2013-08-30 21:45 UTC (permalink / raw)
To: jg1.han; +Cc: netdev
In-Reply-To: <003101cea53b$9fc95b30$df5c1190$%han@samsung.com>
I've applied all of the networking patchs of this series to net-next,
thanks.
^ permalink raw reply
* Re: [PATCH v3 06/11] net: calxedaxgmac: fix race with tx queue stop/wake
From: David Miller @ 2013-08-30 21:41 UTC (permalink / raw)
To: robherring2; +Cc: netdev, bhutchings, buytenh, rob.herring
In-Reply-To: <1377898533-12999-1-git-send-email-robherring2@gmail.com>
When you post a new version of a patch, you must repost the entire series,
not just the patch which is changing.
Thank you.
^ permalink raw reply
* [PATCH v3 06/11] net: calxedaxgmac: fix race with tx queue stop/wake
From: Rob Herring @ 2013-08-30 21:35 UTC (permalink / raw)
To: netdev; +Cc: Ben Hutchings, Lennert Buytenhek, Rob Herring
In-Reply-To: <1377832428-18117-6-git-send-email-robherring2@gmail.com>
From: Rob Herring <rob.herring@calxeda.com>
Since the xgmac transmit start and completion work locklessly, it is
possible for xgmac_xmit to stop the tx queue after the xgmac_tx_complete
has run resulting in the tx queue never being woken up. Fix this by
ensuring that ring buffer index updates are visible and recheck the ring
space after stopping the queue. Also fix an off-by-one bug where we need
to stop the queue when the ring buffer space is equal to MAX_SKB_FRAGS.
The implementation used here was copied from
drivers/net/ethernet/broadcom/tg3.c.
Signed-off-by: Rob Herring <rob.herring@calxeda.com>
---
v3:
- Fix off-by-one bug in queue stopping
v2:
- drop netif_tx_lock
- use netif_start_queue instead of netif_wake_queue
drivers/net/ethernet/calxeda/xgmac.c | 20 +++++++++++++++-----
1 file changed, 15 insertions(+), 5 deletions(-)
diff --git a/drivers/net/ethernet/calxeda/xgmac.c b/drivers/net/ethernet/calxeda/xgmac.c
index f630855..5d0b61a 100644
--- a/drivers/net/ethernet/calxeda/xgmac.c
+++ b/drivers/net/ethernet/calxeda/xgmac.c
@@ -410,6 +410,9 @@ struct xgmac_priv {
#define dma_ring_space(h, t, s) CIRC_SPACE(h, t, s)
#define dma_ring_cnt(h, t, s) CIRC_CNT(h, t, s)
+#define tx_dma_ring_space(p) \
+ dma_ring_space((p)->tx_head, (p)->tx_tail, DMA_TX_RING_SZ)
+
/* XGMAC Descriptor Access Helpers */
static inline void desc_set_buf_len(struct xgmac_dma_desc *p, u32 buf_sz)
{
@@ -886,8 +889,10 @@ static void xgmac_tx_complete(struct xgmac_priv *priv)
priv->tx_tail = dma_ring_incr(entry, DMA_TX_RING_SZ);
}
- if (dma_ring_space(priv->tx_head, priv->tx_tail, DMA_TX_RING_SZ) >
- MAX_SKB_FRAGS)
+ /* Ensure tx_tail is visible to xgmac_xmit */
+ smp_mb();
+ if (unlikely(netif_queue_stopped(priv->dev) &&
+ (tx_dma_ring_space(priv) > MAX_SKB_FRAGS)))
netif_wake_queue(priv->dev);
}
@@ -1125,10 +1130,15 @@ static netdev_tx_t xgmac_xmit(struct sk_buff *skb, struct net_device *dev)
priv->tx_head = dma_ring_incr(entry, DMA_TX_RING_SZ);
- if (dma_ring_space(priv->tx_head, priv->tx_tail, DMA_TX_RING_SZ) <
- MAX_SKB_FRAGS)
+ /* Ensure tx_head update is visible to tx completion */
+ smp_mb();
+ if (unlikely(tx_dma_ring_space(priv) <= MAX_SKB_FRAGS)) {
netif_stop_queue(dev);
-
+ /* Ensure netif_stop_queue is visible to tx completion */
+ smp_mb();
+ if (tx_dma_ring_space(priv) > MAX_SKB_FRAGS)
+ netif_start_queue(dev);
+ }
return NETDEV_TX_OK;
}
--
1.8.1.2
^ permalink raw reply related
* Re: [PATCH] macvlan: fix typo in assignment
From: David Miller @ 2013-08-30 21:31 UTC (permalink / raw)
To: ljaenicke; +Cc: netdev
In-Reply-To: <1377689671-28666-1-git-send-email-ljaenicke@innominate.com>
From: Lutz Jaenicke <ljaenicke@innominate.com>
Date: Wed, 28 Aug 2013 13:34:31 +0200
> commit 3b04ddde02cf1b6f14f2697da5c20eca5715017f
> "[NET]: Move hardware header operations out of netdevice."
> moved the handling into macvlan setup adding
> dev->header_ops = &macvlan_hard_header_ops,
> At the end of the line the ',' should have been a ';'
>
> Signed-off-by: Lutz Jaenicke <ljaenicke@innominate.com>
This is a harmless error, because semantically it causes no bug.
So this is a cleanup and I've thus applied it to net-next, thanks.
^ permalink raw reply
* Re: [PATCH] USB2NET : SR9700 : One Chip USB 1.1 USB2NET SR9700 Device Driver Support
From: David Miller @ 2013-08-30 21:30 UTC (permalink / raw)
To: liujunliang_ljl
Cc: horms, joe, romieu, gregkh, netdev, linux-usb, linux-kernel,
sunhecheng
In-Reply-To: <1377746832-6201-1-git-send-email-liujunliang_ljl@163.com>
Please integrate the fixes Francois has proposed.
^ permalink raw reply
* Re: [PATCH v5][net-next.git] driver:net:stmmac: Disable DMA store and forward mode if platform data force_thresh_dma_mode is set.
From: David Miller @ 2013-08-30 21:26 UTC (permalink / raw)
To: peppe.cavallaro; +Cc: sonic.adi, netdev, adi-buildroot-devel, sonic.zhang
In-Reply-To: <521DE637.6030801@st.com>
From: Giuseppe CAVALLARO <peppe.cavallaro@st.com>
Date: Wed, 28 Aug 2013 13:59:51 +0200
> On 8/28/2013 12:55 PM, Sonic Zhang wrote:
>> From: Sonic Zhang <sonic.zhang@analog.com>
>>
>> Some synopsys ip implementation doesn't support DMA store and forward
>> mode,
>> such as BF60x. So, set force_thresh_dma_mode to use DMA thresholds
>> only.
>> Update document and devicetree as well.
>>
>> Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
>
> Acked-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Applied, thanks.
^ permalink raw reply
* Re: [PATCH net-next] ipv6: Remove redundant sk variable
From: David Miller @ 2013-08-30 21:19 UTC (permalink / raw)
To: tgraf; +Cc: netdev
In-Reply-To: <71fe125646ec6160be05138696d312c050e8b813.1377684285.git.tgraf@suug.ch>
From: Thomas Graf <tgraf@suug.ch>
Date: Wed, 28 Aug 2013 12:05:38 +0200
> A sk variable initialized to ndisc_sk is already available outside
> of the branch.
>
> Signed-off-by: Thomas Graf <tgraf@suug.ch>
Applied, thanks.
^ permalink raw reply
* Re: 1f324e3 ipv6: Don't depend on per socket memory for neighbour discovery messages
From: Fabio Estevam @ 2013-08-30 21:19 UTC (permalink / raw)
To: Stephen Warren
Cc: Thomas Graf, Eric Dumazet, Hannes Frederic Sowa, David S. Miller,
linux-next@vger.kernel.org, netdev@vger.kernel.org
In-Reply-To: <5220F691.4020808@wwwdotorg.org>
On Fri, Aug 30, 2013 at 4:46 PM, Stephen Warren <swarren@wwwdotorg.org> wrote:
> Commit 1f324e3 "ipv6: Don't depend on per socket memory for neighbour
> discovery messages" appears to cause issues for me. If I run
> next-20130830, I see the issue, but if I then just revert that one
> patch, I don't see any problem, and can use the network without issue.
>
> The problem is: with a network device enabled (in my case, a USB
> Ethernet dongle, although I don't know if the type is relevant), then
> the system appears to hang soon after enabling the interface; neither
> the serial console nor the framebuffer echo my typing, and the cursor on
> the framebuffer stops flashing. After a short delay, I see the following
> kernel spew:
I see the same problem on a ARM system (mx6 board) using the built-in
ethernet driver (fec).
^ permalink raw reply
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