iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

IB/rxe: increment msn only when completing a request

Browse Source 
[ Upstream commit 9fcd67d1772c43d2f23e8fca56acc7219e991676 ]

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: 8700e3e7c485 ("Soft RoCE driver")

Signed-off-by: David Marchand <david.marchand@6wind.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
David Marchand 2017-02-24 15:38:26 +01:00 committed by Greg Kroah-Hartman
parent 2f0e39f2e3
commit 2eb783a705
1 changed files with 4 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/infiniband/sw/rxe/rxe_resp.c
View File

@ -799,18 +799,17 @@ static enum resp_states execute(struct rxe_qp *qp, struct rxe_pkt_info *pkt)
/* Unreachable */
WARN_ON(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;