IB/rxe: Fix race condition between requester and completer

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rxe_requester() is sending a pkt with rxe_xmit_packet() and
then calls rxe_update() to update the wqe and qp's psn values.
But sometimes the response is received before the requester
had time to update the wqe in which case the completer
acts on errornous wqe values.
This fix updates the wqe and qp before actually sending
the request and rolls back when xmit fails.

Fixes: 8700e3e7c4 ("Soft RoCE driver")
Signed-off-by: Yonatan Cohen <yonatanc@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>

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Yonatan Cohen 2016-09-07 14:04:06 +03:00 • committed by Doug Ledford

parent 908948877b

commit 3050b99850

1 changed files with 44 additions and 13 deletions

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drivers/infiniband/sw/rxe/rxe_req.c

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