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[rdma-next,2/5] i40iw: Zero-out consumer key on allocate stag for FMR

Message ID 20180112001054.15572-3-shiraz.saleem@intel.com (mailing list archive)
State Accepted
Delegated to: Jason Gunthorpe
Headers show

Commit Message

Shiraz Saleem Jan. 12, 2018, 12:10 a.m. UTC 
If the application invalidates the MR before the FMR WR,
HW parses the consumer key portion of the stag and returns
an invalid stag key Asynchronous Event (AE) that tears down the QP.

Fix this by zeroing-out the consumer key portion of the
allocated stag returned to application for FMR.

Fixes: ee855d3b93f3 ("RDMA/i40iw: Add base memory management extensions")
Signed-off-by: Shiraz Saleem <shiraz.saleem@intel.com>
---
 drivers/infiniband/hw/i40iw/i40iw_verbs.c | 1 +
 1 file changed, 1 insertion(+)
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Patch

diff --git a/drivers/infiniband/hw/i40iw/i40iw_verbs.c b/drivers/infiniband/hw/i40iw/i40iw_verbs.c
index 3c6f3ce..9f18997 100644
--- a/drivers/infiniband/hw/i40iw/i40iw_verbs.c
+++ b/drivers/infiniband/hw/i40iw/i40iw_verbs.c
@@ -1637,6 +1637,7 @@  static struct ib_mr *i40iw_alloc_mr(struct ib_pd *pd,
 		err_code = -EOVERFLOW;
 		goto err;
 	}
+	stag &= ~I40IW_CQPSQ_STAG_KEY_MASK;
 	iwmr->stag = stag;
 	iwmr->ibmr.rkey = stag;
 	iwmr->ibmr.lkey = stag;