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| author | Mike Marciniszyn <mike.marciniszyn@intel.com> | 2013-02-26 15:46:27 +0000 |
|---|---|---|
| committer | Roland Dreier <roland@purestorage.com> | 2013-03-22 18:01:04 -0700 |
| commit | 1ee9e2aa7b31427303466776f455d43e5e3c9275 (patch) | |
| tree | 01026c06a9b3adc0d0b8f9f4349a24f9041ce8c9 /drivers | |
| parent | a937536b868b8369b98967929045f1df54234323 (diff) | |
| download | linux-1ee9e2aa7b31427303466776f455d43e5e3c9275.tar.gz linux-1ee9e2aa7b31427303466776f455d43e5e3c9275.tar.bz2 linux-1ee9e2aa7b31427303466776f455d43e5e3c9275.zip | |
IPoIB: Fix send lockup due to missed TX completion
Commit f0dc117abdfa ("IPoIB: Fix TX queue lockup with mixed UD/CM
traffic") attempts to solve an issue where unprocessed UD send
completions can deadlock the netdev.
The patch doesn't fully resolve the issue because if more than half
the tx_outstanding's were UD and all of the destinations are RC
reachable, arming the CQ doesn't solve the issue.
This patch uses the IB_CQ_REPORT_MISSED_EVENTS on the
ib_req_notify_cq(). If the rc is above 0, the UD send cq completion
callback is called directly to re-arm the send completion timer.
This issue is seen in very large parallel filesystem deployments
and the patch has been shown to correct the issue.
Cc: <stable@vger.kernel.org>
Reviewed-by: Dean Luick <dean.luick@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/infiniband/ulp/ipoib/ipoib_cm.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_cm.c b/drivers/infiniband/ulp/ipoib/ipoib_cm.c index 67b0c1d23678..1ef880de3a41 100644 --- a/drivers/infiniband/ulp/ipoib/ipoib_cm.c +++ b/drivers/infiniband/ulp/ipoib/ipoib_cm.c @@ -758,9 +758,13 @@ void ipoib_cm_send(struct net_device *dev, struct sk_buff *skb, struct ipoib_cm_ if (++priv->tx_outstanding == ipoib_sendq_size) { ipoib_dbg(priv, "TX ring 0x%x full, stopping kernel net queue\n", tx->qp->qp_num); - if (ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP)) - ipoib_warn(priv, "request notify on send CQ failed\n"); netif_stop_queue(dev); + rc = ib_req_notify_cq(priv->send_cq, + IB_CQ_NEXT_COMP | IB_CQ_REPORT_MISSED_EVENTS); + if (rc < 0) + ipoib_warn(priv, "request notify on send CQ failed\n"); + else if (rc) + ipoib_send_comp_handler(priv->send_cq, dev); } } } |