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| author | Bob Pearson <rpearsonhpe@gmail.com> | 2020-10-13 12:07:42 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-12-30 11:25:50 +0100 |
| commit | e02d63b00889661e868035d80bbcdbb687dedaf0 (patch) | |
| tree | 34d64e9d297569e6ff44b6067f33420b3563d874 /drivers/infiniband/sw | |
| parent | 620974102ad8ed5641f805dfec7e75765c3d2df9 (diff) | |
| download | linux-e02d63b00889661e868035d80bbcdbb687dedaf0.tar.gz linux-e02d63b00889661e868035d80bbcdbb687dedaf0.tar.bz2 linux-e02d63b00889661e868035d80bbcdbb687dedaf0.zip | |
RDMA/rxe: Compute PSN windows correctly
[ 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>
Diffstat (limited to 'drivers/infiniband/sw')
| -rw-r--r-- | drivers/infiniband/sw/rxe/rxe_req.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/infiniband/sw/rxe/rxe_req.c b/drivers/infiniband/sw/rxe/rxe_req.c index 1c1eae0ef8c2..63db49144f62 100644 --- a/drivers/infiniband/sw/rxe/rxe_req.c +++ b/drivers/infiniband/sw/rxe/rxe_req.c @@ -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; } |