iw_cxgb4: only insert drain cqes if wq is flushed

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commit c058ecf6e4 upstream.

Only insert our special drain CQEs to support ib_drain_sq/rq() after
the wq is flushed. Otherwise, existing but not yet polled CQEs can be
returned out of order to the user application.  This can happen when the
QP has exited RTS but not yet flushed the QP, which can happen during
a normal close (vs abortive close).

In addition never count the drain CQEs when determining how many CQEs
need to be synthesized during the flush operation.  This latter issue
should never happen if the QP is properly flushed before inserting the
drain CQE, but I wanted to avoid corrupting the CQ state.  So we handle
it and log a warning once.

Fixes: 4fe7c2962e ("iw_cxgb4: refactor sq/rq drain logic")
Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Steve Wise 2017-11-27 13:16:32 -08:00 • committed by Greg Kroah-Hartman

parent 7dd1362247

commit 2d8262155a

2 changed files with 17 additions and 2 deletions

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5

drivers/infiniband/hw/cxgb4/cq.c

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14

drivers/infiniband/hw/cxgb4/qp.c

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