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IB/IPoIB: Add destination address when re-queue packet 

When sending packet to destination that was not resolved yet
via path query, the driver keeps the skb and tries to re-send it
again when the path is resolved.

But when re-sending via dev_queue_xmit the kernel doesn't call
to dev_hard_header, so IPoIB needs to keep 20 bytes in the skb
and to put the destination address inside them.

In that way the dev_start_xmit will have the correct destination,
and the driver won't take the destination from the skb->data, while
nothing exists there, which causes to packet be be dropped.

The test flow is:
1. Run the SM on remote node,
2. Restart the driver.
4. Ping some destination,
3. Observe that first ICMP request will be dropped.

Fixes: fc791b6335 ("IB/ipoib: move back IB LL address into the hard header")
Cc: <stable@vger.kernel.org> # v4.8+
Signed-off-by: Erez Shitrit <erezsh@mellanox.com>
Signed-off-by: Noa Osherovich <noaos@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Tested-by: Yuval Shaia <yuval.shaia@oracle.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Erez Shitrit 2017-02-01 19:10:05 +02:00 committed by Doug Ledford
parent 592e8b3226
commit 2b0841766a
1 changed files with 17 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

30
drivers/infiniband/ulp/ipoib/ipoib_main.c
View File

@ -721,6 +721,14 @@ int ipoib_check_sm_sendonly_fullmember_support(struct ipoib_dev_priv *priv)
return ret;
}
static void push_pseudo_header(struct sk_buff *skb, const char *daddr)
{
struct ipoib_pseudo_header *phdr;
phdr = (struct ipoib_pseudo_header *)skb_push(skb, sizeof(*phdr));
memcpy(phdr->hwaddr, daddr, INFINIBAND_ALEN);
}
void ipoib_flush_paths(struct net_device *dev)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
@ -947,8 +955,7 @@ static void neigh_add_path(struct sk_buff *skb, u8 *daddr,
}
if (skb_queue_len(&neigh->queue) <
IPOIB_MAX_PATH_REC_QUEUE) {
/* put pseudoheader back on for next time */
skb_push(skb, IPOIB_PSEUDO_LEN);
push_pseudo_header(skb, neigh->daddr);
__skb_queue_tail(&neigh->queue, skb);
} else {
ipoib_warn(priv, "queue length limit %d. Packet drop.\n",
@ -966,10 +973,12 @@ static void neigh_add_path(struct sk_buff *skb, u8 *daddr,
if (!path->query && path_rec_start(dev, path))
goto err_path;
if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE)
if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
push_pseudo_header(skb, neigh->daddr);
__skb_queue_tail(&neigh->queue, skb);
else
} else {
goto err_drop;
}
}
spin_unlock_irqrestore(&priv->lock, flags);
@ -1005,8 +1014,7 @@ static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
}
if (path) {
if (skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
/* put pseudoheader back on for next time */
skb_push(skb, IPOIB_PSEUDO_LEN);
push_pseudo_header(skb, phdr->hwaddr);
__skb_queue_tail(&path->queue, skb);
} else {
++dev->stats.tx_dropped;
@ -1038,8 +1046,7 @@ static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
return;
} else if ((path->query || !path_rec_start(dev, path)) &&
skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
/* put pseudoheader back on for next time */
skb_push(skb, IPOIB_PSEUDO_LEN);
push_pseudo_header(skb, phdr->hwaddr);
__skb_queue_tail(&path->queue, skb);
} else {
++dev->stats.tx_dropped;
@ -1120,8 +1127,7 @@ static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
}
if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
/* put pseudoheader back on for next time */
skb_push(skb, sizeof(*phdr));
push_pseudo_header(skb, phdr->hwaddr);
spin_lock_irqsave(&priv->lock, flags);
__skb_queue_tail(&neigh->queue, skb);
spin_unlock_irqrestore(&priv->lock, flags);
@ -1153,7 +1159,6 @@ static int ipoib_hard_header(struct sk_buff *skb,
unsigned short type,
const void *daddr, const void *saddr, unsigned len)
{
struct ipoib_pseudo_header *phdr;
struct ipoib_header *header;
header = (struct ipoib_header *) skb_push(skb, sizeof *header);
@ -1166,8 +1171,7 @@ static int ipoib_hard_header(struct sk_buff *skb,
* destination address into skb hard header so we can figure out where
* to send the packet later.
*/
phdr = (struct ipoib_pseudo_header *) skb_push(skb, sizeof(*phdr));
memcpy(phdr->hwaddr, daddr, INFINIBAND_ALEN);
push_pseudo_header(skb, daddr);
return IPOIB_HARD_LEN;
}