linux-kernel - [PATCH 1/4] staging: lustre: o2iblnd: limit cap.max_send

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Date:	Mon,  9 May 2016 10:53:45 -0400
From:	James Simmons <jsimmons@...radead.org>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	devel@...verdev.osuosl.org,
	Andreas Dilger <andreas.dilger@...el.com>,
	Oleg Drokin <oleg.drokin@...el.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Lustre Development List <lustre-devel@...ts.lustre.org>,
	Dmitry Eremin <dmitry.eremin@...el.com>,
	James Simmons <jsimmons@...radead.org>
Subject: [PATCH 1/4] staging: lustre: o2iblnd: limit cap.max_send_wr for MLX5

From: Dmitry Eremin <dmitry.eremin@...el.com>

Decrease cap.max_send_wr until it is accepted by rdma_create_qp()

Signed-off-by: Dmitry Eremin <dmitry.eremin@...el.com>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-7124
Reviewed-on: http://review.whamcloud.com/18347
Reviewed-by: Olaf Weber <olaf@....com>
Reviewed-by: Doug Oucharek <doug.s.oucharek@...el.com>
Reviewed-by: Oleg Drokin <oleg.drokin@...el.com>
Signed-off-by: James Simmons <jsimmons@...radead.org>
---
 .../staging/lustre/lnet/klnds/o2iblnd/o2iblnd.c    |   11 ++++++++++-
 1 files changed, 10 insertions(+), 1 deletions(-)

diff --git a/drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd.c b/drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd.c
index d99b4fa..bc179a2 100644
--- a/drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd.c
+++ b/drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd.c
@@ -768,7 +768,12 @@ kib_conn_t *kiblnd_create_conn(kib_peer_t *peer, struct rdma_cm_id *cmid,
 
 	conn->ibc_sched = sched;
 
-	rc = rdma_create_qp(cmid, conn->ibc_hdev->ibh_pd, init_qp_attr);
+	do {
+		rc = rdma_create_qp(cmid, conn->ibc_hdev->ibh_pd, init_qp_attr);
+		if (!rc || init_qp_attr->cap.max_send_wr < 16)
+			break;
+	} while (rc);
+
 	if (rc) {
 		CERROR("Can't create QP: %d, send_wr: %d, recv_wr: %d\n",
 		       rc, init_qp_attr->cap.max_send_wr,
@@ -776,6 +781,10 @@ kib_conn_t *kiblnd_create_conn(kib_peer_t *peer, struct rdma_cm_id *cmid,
 		goto failed_2;
 	}
 
+	if (init_qp_attr->cap.max_send_wr != IBLND_SEND_WRS(conn))
+		CDEBUG(D_NET, "original send wr %d, created with %d\n",
+		       IBLND_SEND_WRS(conn), init_qp_attr->cap.max_send_wr);
+
 	LIBCFS_FREE(init_qp_attr, sizeof(*init_qp_attr));
 
 	/* 1 ref for caller and each rxmsg */
-- 
1.7.1