[PATCH for-next 07/11] RDMA/rxe: Don't call rxe_requester from rxe_completer

[Bob Pearson <rpearsonhpe@xxxxxxxxx>]

Instead of rescheduling rxe_requester from rxe_completer() just extend
the duration of rxe_sender() by one pass. Setting run_requester_again
forces rxe_completer() to return 0 which will cause rxe_sender() to be
called at least one more time.

Signed-off-by: Bob Pearson <rpearsonhpe@xxxxxxxxx>
---
 drivers/infiniband/sw/rxe/rxe_comp.c | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/drivers/infiniband/sw/rxe/rxe_comp.c b/drivers/infiniband/sw/rxe/rxe_comp.c
index ea64a25fe876..c41743fbd5f1 100644
--- a/drivers/infiniband/sw/rxe/rxe_comp.c
+++ b/drivers/infiniband/sw/rxe/rxe_comp.c
@@ -82,6 +82,8 @@ static unsigned long rnrnak_usec[32] = {
 	[IB_RNR_TIMER_491_52] = 491520,
 };
 
+static int run_requester_again;
+
 static inline unsigned long rnrnak_jiffies(u8 timeout)
 {
 	return max_t(unsigned long,
@@ -325,7 +327,7 @@ static inline enum comp_state check_ack(struct rxe_qp *qp,
 					qp->comp.psn = pkt->psn;
 					if (qp->req.wait_psn) {
 						qp->req.wait_psn = 0;
-						rxe_sched_task(&qp->send_task);
+						run_requester_again = 1;
 					}
 				}
 				return COMPST_ERROR_RETRY;
@@ -476,7 +478,7 @@ static void do_complete(struct rxe_qp *qp, struct rxe_send_wqe *wqe)
 	 */
 	if (qp->req.wait_fence) {
 		qp->req.wait_fence = 0;
-		rxe_sched_task(&qp->send_task);
+		run_requester_again = 1;
 	}
 }
 
@@ -515,7 +517,7 @@ static inline enum comp_state complete_ack(struct rxe_qp *qp,
 		if (qp->req.need_rd_atomic) {
 			qp->comp.timeout_retry = 0;
 			qp->req.need_rd_atomic = 0;
-			rxe_sched_task(&qp->send_task);
+			run_requester_again = 1;
 		}
 	}
 
@@ -541,7 +543,7 @@ static inline enum comp_state complete_wqe(struct rxe_qp *qp,
 
 		if (qp->req.wait_psn) {
 			qp->req.wait_psn = 0;
-			rxe_sched_task(&qp->send_task);
+			run_requester_again = 1;
 		}
 	}
 
@@ -654,6 +656,8 @@ int rxe_completer(struct rxe_qp *qp)
 	int ret;
 	unsigned long flags;
 
+	run_requester_again = 0;
+
 	spin_lock_irqsave(&qp->state_lock, flags);
 	if (!qp->valid || qp_state(qp) == IB_QPS_ERR ||
 			  qp_state(qp) == IB_QPS_RESET) {
@@ -737,7 +741,7 @@ int rxe_completer(struct rxe_qp *qp)
 
 			if (qp->req.wait_psn) {
 				qp->req.wait_psn = 0;
-				rxe_sched_task(&qp->send_task);
+				run_requester_again = 1;
 			}
 
 			state = COMPST_DONE;
@@ -792,7 +796,7 @@ int rxe_completer(struct rxe_qp *qp)
 							RXE_CNT_COMP_RETRY);
 					qp->req.need_retry = 1;
 					qp->comp.started_retry = 1;
-					rxe_sched_task(&qp->send_task);
+					run_requester_again = 1;
 				}
 				goto done;
 
@@ -843,8 +847,9 @@ int rxe_completer(struct rxe_qp *qp)
 	ret = 0;
 	goto out;
 exit:
-	ret = -EAGAIN;
+	ret = (run_requester_again) ? 0 : -EAGAIN;
 out:
+	run_requester_again = 0;
 	if (pkt)
 		free_pkt(pkt);
 	return ret;
-- 
2.43.0