From: Selvin Xavier <selvin.xavier@emulex.com>
Date: Tue, 1 Jul 2014 04:56:11 +0000 (+0530)
Subject: RDMA/libocrdma: stop polling when SQ/RQ is empty
X-Git-Tag: libocrdma-1.0.5~6
X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=bf0f81d875c3cd76e85d61e61dcd874cf45d43bf;p=~emulex%2Flibocrdma.git

RDMA/libocrdma: stop polling when SQ/RQ is empty

The cq polling logic was hitting an infinite loop while generating
flush completions for a torn down QP. This patch adds a check in
flush completion logic to detect SQ/RQ empty condition and stop
polling loop.

Signed-off-by: Devesh Sharma <devesh.sharma@emulex.com>
Signed-off-by: Selvin Xavier <selvin.xavier@emulex.com>
---

diff --git a/src/ocrdma_verbs.c b/src/ocrdma_verbs.c
index a5b7252..edff8b6 100644
--- a/src/ocrdma_verbs.c
+++ b/src/ocrdma_verbs.c
@@ -1739,6 +1739,11 @@ static int ocrdma_poll_err_scqe(struct ocrdma_qp *qp,
 			*stop = 1;
 			expand = 0;
 		}
+	} else if (is_hw_sq_empty(qp)) {
+		/* Do nothing */
+		expand = 0;
+		*polled = 0;
+		*stop = 0;
 	} else {
 		*polled = 1;
 		expand = ocrdma_update_err_scqe(ibwc, cqe, qp, status);
@@ -1848,6 +1853,11 @@ static int ocrdma_poll_err_rcqe(struct ocrdma_qp *qp, struct ocrdma_cqe *cqe,
 			*stop = 1;
 			expand = 0;
 		}
+	} else if (is_hw_rq_empty(qp)) {
+		/* Do nothing */
+		expand = 0;
+		*polled = 0;
+		*stop = 0;
 	} else {
 		*polled = 1;
 		expand = ocrdma_update_err_rcqe(ibwc, cqe, qp, status);