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RDMA/rxe: Compute PSN windows correctly

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[ Upstream commit bb3ab2979fd69db23328691cb10067861df89037 ]

The code which limited the number of unacknowledged PSNs was incorrect.
The PSNs are limited to 24 bits and wrap back to zero from 0x00ffffff.
The test was computing a 32 bit value which wraps at 32 bits so that
qp->req.psn can appear smaller than the limit when it is actually larger.

Replace '>' test with psn_compare which is used for other PSN comparisons
and correctly handles the 24 bit size.

Fixes: 8700e3e7c485 ("Soft RoCE driver")
Link: https://lore.kernel.org/r/20201013170741.3590-1-rpearson@hpe.com
Signed-off-by: Bob Pearson <rpearson@hpe.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Bob Pearson 2020-10-13 12:07:42 -05:00 committed by Greg Kroah-Hartman
parent 35f1856161
commit 0fd78ab5ef
1 changed files with 2 additions and 1 deletions
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3
drivers/infiniband/sw/rxe/rxe_req.c
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@ -664,7 +664,8 @@ next_wqe:
}
if (unlikely(qp_type(qp) == IB_QPT_RC &&
qp->req.psn > (qp->comp.psn + RXE_MAX_UNACKED_PSNS))) {
psn_compare(qp->req.psn, (qp->comp.psn +
RXE_MAX_UNACKED_PSNS)) > 0)) {
qp->req.wait_psn = 1;
goto exit;
}