linux-kernel - [PATCH AUTOSEL for 4.15 039/124] IB/ipoib: Fix for notify send CQ failure messages

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Date:   Mon, 19 Mar 2018 15:47:39 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
CC:     Alex Estrin <alex.estrin@...el.com>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL for 4.15 039/124] IB/ipoib: Fix for notify send CQ
 failure messages

From: Alex Estrin <alex.estrin@...el.com>

[ Upstream commit 809cb6955650d892c6ef95f1d55f28fceded0ce1 ]

If IB_CQ_REPORT_MISSED_EVENTS flag is passed in ib_req_notify_cq()
it may return positive value indicating non-empty CQ.
If return code not verified the log might be flooded with false
warning messages "request notify on send CQ failed".

Fixes: 8966e28d2e40 ("IB/ipoib: Use NAPI in UD/TX flows")
Reviewed-by: Mike Marciniszyn <mike.marciniszyn@...el.com>
Signed-off-by: Alex Estrin <alex.estrin@...el.com>
Signed-off-by: Jason Gunthorpe <jgg@...lanox.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 drivers/infiniband/ulp/ipoib/ipoib_cm.c | 10 ++++++----
 drivers/infiniband/ulp/ipoib/ipoib_ib.c |  2 +-
 2 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/infiniband/ulp/ipoib/ipoib_cm.c b/drivers/infiniband/ulp/ipoib/ipoib_cm.c
index 71ea9e26666c..c075d6850ed3 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_cm.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_cm.c
@@ -766,12 +766,14 @@ void ipoib_cm_send(struct net_device *dev, struct sk_buff *skb, struct ipoib_cm_
 	skb_orphan(skb);
 	skb_dst_drop(skb);
 
-	if (netif_queue_stopped(dev))
-		if (ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP |
-				     IB_CQ_REPORT_MISSED_EVENTS)) {
+	if (netif_queue_stopped(dev)) {
+		rc = ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP |
+				      IB_CQ_REPORT_MISSED_EVENTS);
+		if (unlikely(rc < 0))
 			ipoib_warn(priv, "IPoIB/CM:request notify on send CQ failed\n");
+		else if (rc)
 			napi_schedule(&priv->send_napi);
-		}
+	}
 
 	rc = post_send(priv, tx, tx->tx_head & (ipoib_sendq_size - 1), tx_req);
 	if (unlikely(rc)) {
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_ib.c b/drivers/infiniband/ulp/ipoib/ipoib_ib.c
index e6151a29c412..28658080e761 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_ib.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_ib.c
@@ -644,7 +644,7 @@ int ipoib_send(struct net_device *dev, struct sk_buff *skb,
 
 	if (netif_queue_stopped(dev))
 		if (ib_req_notify_cq(priv->send_cq, IB_CQ_NEXT_COMP |
-				     IB_CQ_REPORT_MISSED_EVENTS))
+				     IB_CQ_REPORT_MISSED_EVENTS) < 0)
 			ipoib_warn(priv, "request notify on send CQ failed\n");
 
 	rc = post_send(priv, priv->tx_head & (ipoib_sendq_size - 1),
-- 
2.14.1