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ipoib: Bound the number of egress mbufs buffered during pathrec lookups.

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In pathological situations where the master subnet manager becomes
unresponsive for an extended period, we may otherwise end up queuing all
of the system's mbufs while waiting for a response to a path record lookup.

This addresses the same issue as commit 1e85b806f9 in Linux.

Reviewed by:	cem, ngie
MFC after:	2 weeks
Sponsored by:	EMC / Isilon Storage Division
This commit is contained in:
Mark Johnston 2016-08-01 22:22:11 +00:00
parent 2611037c1c
commit 49fe7b5029
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=303646
1 changed files with 7 additions and 1 deletions
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8
sys/ofed/drivers/infiniband/ulp/ipoib/ipoib_main.c
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@ -660,7 +660,13 @@ ipoib_unicast_send(struct mbuf *mb, struct ipoib_dev_priv *priv, struct ipoib_he
new_path = 1;
}
if (path) {
_IF_ENQUEUE(&path->queue, mb);
if (_IF_QLEN(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE)
_IF_ENQUEUE(&path->queue, mb);
else {
if_inc_counter(priv->dev, IFCOUNTER_OERRORS, 1);
m_freem(mb);
}
if (!path->query && path_rec_start(priv, path)) {
spin_unlock_irqrestore(&priv->lock, flags);
if (new_path)