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RDMA/ipoib: drop skb on path record lookup failure

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In unicast_arp_send function there is an inconsistency in error handling
of path_rec_start call. If path_rec_start is called because of an absent
ah field, skb will be dropped. But if it is called on a creation of a
new path, or if the path is invalid, skb will be added to the tail of
path queue.  In case of a new path it will be dropped on path_free, but
in case of invalid path it can stay in the queue forever.

This patch unifies the behavior, dropping skb in all cases
of path_rec_start failure.

Signed-off-by: Evgenii Smirnov <evgenii.smirnov@profitbricks.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Evgenii Smirnov 2018-05-22 16:00:47 +02:00 committed by Doug Ledford
parent fa9391dbad
commit 15517080c5
1 changed files with 22 additions and 42 deletions
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50
drivers/infiniband/ulp/ipoib/ipoib_main.c
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@ -1054,62 +1054,42 @@ static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
path = __path_find(dev, phdr->hwaddr + 4);
if (!path || !path->ah || !path->ah->valid) {
int new_path = 0;
if (!path) {
path = path_rec_create(dev, phdr->hwaddr + 4);
new_path = 1;
}
if (path) {
if (!new_path)
/* make sure there is no changes in the existing path record */
if (!path)
goto drop_and_unlock;
__path_add(dev, path);
} else {
/*
* make sure there are no changes in the existing
* path record
*/
init_path_rec(priv, path, phdr->hwaddr + 4);
}
if (!path->query && path_rec_start(dev, path)) {
goto drop_and_unlock;
}
if (skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
push_pseudo_header(skb, phdr->hwaddr);
__skb_queue_tail(&path->queue, skb);
} else {
++dev->stats.tx_dropped;
dev_kfree_skb_any(skb);
}
if (!path->query && path_rec_start(dev, path)) {
spin_unlock_irqrestore(&priv->lock, flags);
if (new_path)
path_free(dev, path);
return;
} else
__path_add(dev, path);
goto unlock;
} else {
goto drop_and_unlock;
}
spin_unlock_irqrestore(&priv->lock, flags);
return;
}
if (path->ah && path->ah->valid) {
spin_unlock_irqrestore(&priv->lock, flags);
ipoib_dbg(priv, "Send unicast ARP to %08x\n",
be32_to_cpu(sa_path_get_dlid(&path->pathrec)));
spin_unlock_irqrestore(&priv->lock, flags);
path->ah->last_send = rn->send(dev, skb, path->ah->ah,
IPOIB_QPN(phdr->hwaddr));
return;
} else if ((path->query || !path_rec_start(dev, path)) &&
skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
push_pseudo_header(skb, phdr->hwaddr);
__skb_queue_tail(&path->queue, skb);
} else {
goto drop_and_unlock;
}
spin_unlock_irqrestore(&priv->lock, flags);
return;
drop_and_unlock:
++dev->stats.tx_dropped;
dev_kfree_skb_any(skb);
unlock:
spin_unlock_irqrestore(&priv->lock, flags);
}