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IB/rxe: increment msn only when completing a request

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According to C9-147, MSN should only be incremented when the last packet of
a multi packet request has been received.

"Logically, the requester associates a sequential Send Sequence Number
(SSN) with each WQE posted to the send queue. The SSN bears a one-
to-one relationship to the MSN returned by the responder in each re-
sponse packet. Therefore, when the requester receives a response, it in-
terprets the MSN as representing the SSN of the most recent request
completed by the responder to determine which send WQE(s) can be
completed."

Fixes: 8700e3e7c4 ("Soft RoCE driver")

Signed-off-by: David Marchand <david.marchand@6wind.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
David Marchand 2017-02-24 15:38:26 +01:00 committed by Doug Ledford
parent 812755d69e
commit 9fcd67d177
1 changed files with 4 additions and 5 deletions
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9
drivers/infiniband/sw/rxe/rxe_resp.c
View file

@ -813,18 +813,17 @@ static enum resp_states execute(struct rxe_qp *qp, struct rxe_pkt_info *pkt)
WARN_ON_ONCE(1);
}
/* We successfully processed this new request. */
qp->resp.msn++;
/* next expected psn, read handles this separately */
qp->resp.psn = (pkt->psn + 1) & BTH_PSN_MASK;
qp->resp.opcode = pkt->opcode;
qp->resp.status = IB_WC_SUCCESS;
if (pkt->mask & RXE_COMP_MASK)
if (pkt->mask & RXE_COMP_MASK) {
/* We successfully processed this new request. */
qp->resp.msn++;
return RESPST_COMPLETE;
else if (qp_type(qp) == IB_QPT_RC)
} else if (qp_type(qp) == IB_QPT_RC)
return RESPST_ACKNOWLEDGE;
else
return RESPST_CLEANUP;