linux-kernel - [PATCH 5.8 031/177] RDMA/core: Fix reported speed and width

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Message-Id: <20200915140655.131837751@linuxfoundation.org>
Date:   Tue, 15 Sep 2020 16:11:42 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Kamal Heib <kamalheib1@...il.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.8 031/177] RDMA/core: Fix reported speed and width

From: Kamal Heib <kamalheib1@...il.com>

[ Upstream commit 28b0865714b315e318ac45c4fc9156f3d4649646 ]

When the returned speed from __ethtool_get_link_ksettings() is
SPEED_UNKNOWN this will lead to reporting a wrong speed and width for
providers that uses ib_get_eth_speed(), fix that by defaulting the
netdev_speed to SPEED_1000 in case the returned value from
__ethtool_get_link_ksettings() is SPEED_UNKNOWN.

Fixes: d41861942fc5 ("IB/core: Add generic function to extract IB speed from netdev")
Link: https://lore.kernel.org/r/20200902124304.170912-1-kamalheib1@gmail.com
Signed-off-by: Kamal Heib <kamalheib1@...il.com>
Signed-off-by: Jason Gunthorpe <jgg@...dia.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/infiniband/core/verbs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/infiniband/core/verbs.c b/drivers/infiniband/core/verbs.c
index f369f0a19e851..1b0ea945756f0 100644
--- a/drivers/infiniband/core/verbs.c
+++ b/drivers/infiniband/core/verbs.c
@@ -1803,7 +1803,7 @@ int ib_get_eth_speed(struct ib_device *dev, u8 port_num, u8 *speed, u8 *width)
 
 	dev_put(netdev);
 
-	if (!rc) {
+	if (!rc && lksettings.base.speed != (u32)SPEED_UNKNOWN) {
 		netdev_speed = lksettings.base.speed;
 	} else {
 		netdev_speed = SPEED_1000;
-- 
2.25.1