tree b72e7d9b6b3e5338d636746e77d326bd42aa4e29
parent 24bd1e4e32e88cd3d0675482d15bea498a922ca8
author Michael S. Tsirkin <mst@dev.mellanox.co.il> 1179749099 +0300
committer Roland Dreier <rolandd@cisco.com> 1179779740 -0700

IPoIB/cm: Fix SRQ WR leak

SRQ WR leakage has been observed with IPoIB/CM: e.g. flipping ports on
and off will, with time, leak out all WRs and then all connections
will start getting RNR NAKs.  Fix this in the way suggested by spec:
move the QP being destroyed to the error state, wait for "Last WQE
Reached" event and then post WR on a "drain QP" connected to the same
CQ.  Once we observe a completion on the drain QP, it's safe to call
ib_destroy_qp.

Signed-off-by: Michael S. Tsirkin <mst@dev.mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>