linux-kernel - [PATCH 3.4 20/92] IB/mlx4: Use correct SL on AH query under RoCE

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Date:	Mon, 18 Apr 2016 18:45:25 +0800
From:	lizf@...nel.org
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Noa Osherovich <noaos@...lanox.com>,
	Shani Michaeli <shanim@...lanox.com>,
	Or Gerlitz <ogerlitz@...lanox.com>,
	Doug Ledford <dledford@...hat.com>,
	Zefan Li <lizefan@...wei.com>
Subject: [PATCH 3.4 20/92] IB/mlx4: Use correct SL on AH query under RoCE

From: Noa Osherovich <noaos@...lanox.com>

3.4.112-rc1 review patch.  If anyone has any objections, please let me know.

------------------


commit 5e99b139f1b68acd65e36515ca347b03856dfb5a upstream.

The mlx4 IB driver implementation for ib_query_ah used a wrong offset
(28 instead of 29) when link type is Ethernet. Fixed to use the correct one.

Fixes: fa417f7b520e ('IB/mlx4: Add support for IBoE')
Signed-off-by: Shani Michaeli <shanim@...lanox.com>
Signed-off-by: Noa Osherovich <noaos@...lanox.com>
Signed-off-by: Or Gerlitz <ogerlitz@...lanox.com>
Signed-off-by: Doug Ledford <dledford@...hat.com>
Signed-off-by: Zefan Li <lizefan@...wei.com>
---
 drivers/infiniband/hw/mlx4/ah.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/infiniband/hw/mlx4/ah.c b/drivers/infiniband/hw/mlx4/ah.c
index a251bec..890c23b 100644
--- a/drivers/infiniband/hw/mlx4/ah.c
+++ b/drivers/infiniband/hw/mlx4/ah.c
@@ -169,9 +169,13 @@ int mlx4_ib_query_ah(struct ib_ah *ibah, struct ib_ah_attr *ah_attr)
 	enum rdma_link_layer ll;
 
 	memset(ah_attr, 0, sizeof *ah_attr);
-	ah_attr->sl = be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) >> 28;
 	ah_attr->port_num = be32_to_cpu(ah->av.ib.port_pd) >> 24;
 	ll = rdma_port_get_link_layer(ibah->device, ah_attr->port_num);
+	if (ll == IB_LINK_LAYER_ETHERNET)
+		ah_attr->sl = be32_to_cpu(ah->av.eth.sl_tclass_flowlabel) >> 29;
+	else
+		ah_attr->sl = be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) >> 28;
+
 	ah_attr->dlid = ll == IB_LINK_LAYER_INFINIBAND ? be16_to_cpu(ah->av.ib.dlid) : 0;
 	if (ah->av.ib.stat_rate)
 		ah_attr->static_rate = ah->av.ib.stat_rate - MLX4_STAT_RATE_OFFSET;
-- 
1.9.1