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authorEli Cohen <eli@dev.mellanox.co.il>2008-04-30 20:02:45 -0700
committerRoland Dreier <rolandd@cisco.com>2008-04-30 20:02:45 -0700
commit57ce41d1d18279cc90223f3deadca70c7de1cfca (patch)
tree39111403527e4744b4a6a15d5ffe3fd038751489 /drivers/infiniband/hw
parent3ae15e1623b9d32eb410c2a23d90e47b16e6acd0 (diff)
IB/ipoib: Fix transmit queue stalling forever
Commit f56bcd80 ("IPoIB: Use separate CQ for UD send completions") introduced a bug where the transmit queue could get stopped and never woken up. The problem is that send completions are only polled at the end of the xmit function, so if the send queue fills up and the xmit path stops the queue, then there is no way for send completions to ever get polled, and so the transmit queue stays stopped forever. Fix this by arming the send CQ just before posting the last send request that fills the send queue. Then, when the completion event handler is called, drain the send CQ. Since it is possible that not enough send completions are in the CQ, verify that the the net queue has been woken up after draining the send CQ, and if not arm a timer and drain again at the timer function. Signed-off-by: Roland Dreier <rolandd@cisco.com>
Diffstat (limited to 'drivers/infiniband/hw')
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