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From:   Honggang LI <honli@redhat.com>
To:     dledford@redhat.com, jgg@ziepe.ca, matanb@mellanox.com,
        leonro@mellanox.com, linux-rdma@vger.kernel.org
Cc:     linux-kernel@vger.kernel.org, noaos@mellanox.com, honli@redhat.com
Subject: [PATCH] IB/mlx5: Set the default active rate and width to QDR and 4X
Date:   Fri, 16 Mar 2018 10:37:13 +0800
Message-Id: <20180316023713.30323-1-honli@redhat.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

From: Honggang Li <honli@redhat.com>

commit f1b65df5a232 ("IB/mlx5: Add support for active_width and
active_speed in RoCE"). Before this patch applied, the mlx5_ib
driver set default active_width and active_speed to IB_WIDTH_4X
and IB_SPEED_QDR.

When the RoCE port is down, the RoCE port did not negotiate the
active width with remote side. The active width is zero. If run
ibstat to require the port status, ibstat will panic as it read
invalid width from sys file.

This patch restores the original behavior.

Fixes: f1b65df5a232 ("IB/mlx5: Add support for active_width and active_speed in RoCE").
Signed-off-by: Honggang Li <honli@redhat.com>
---
 drivers/infiniband/hw/mlx5/main.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/infiniband/hw/mlx5/main.c b/drivers/infiniband/hw/mlx5/main.c
index 033b6af90de9..a48e9730fab8 100644
--- a/drivers/infiniband/hw/mlx5/main.c
+++ b/drivers/infiniband/hw/mlx5/main.c
@@ -388,6 +388,9 @@ static int mlx5_query_port_roce(struct ib_device *device, u8 port_num,
 	if (err)
 		goto out;
 
+	props->active_width     = IB_WIDTH_4X;
+	props->active_speed     = IB_SPEED_QDR;
+
 	translate_eth_proto_oper(eth_prot_oper, &props->active_speed,
 				 &props->active_width);
 
-- 
2.14.GIT