linux-kernel - [GIT PULL for-3.18 07/13] net/mlx4_core: Fix VF overwrite of module param which disables DMFS on new probed PFs

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Message-ID: <20171011004547.8116-8-alexander.levin@verizon.com>
Date:   Wed, 11 Oct 2017 00:45:54 +0000
From:   "Levin, Alexander (Sasha Levin)" <alexander.levin@...izon.com>
To:     "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: [GIT PULL for-3.18 07/13] net/mlx4_core: Fix VF overwrite of module
 param which disables DMFS on new probed PFs

From: Majd Dibbiny <majd@...lanox.com>

[ Upstream commit 95f1ba9a24af9769f6e20dfe9a77c863f253f311 ]

In the VF driver, module parameter mlx4_log_num_mgm_entry_size was
mistakenly overwritten -- and in a manner which overrode the
device-managed flow steering option encoded in the parameter.

log_num_mgm_entry_size is a global module parameter which
affects all ConnectX-3 PFs installed on that host.
If a VF changes log_num_mgm_entry_size, this will affect all PFs
which are probed subsequent to the change (by disabling DMFS for
those PFs).

Fixes: 3c439b5586e9 ("mlx4_core: Allow choosing flow steering mode")
Signed-off-by: Majd Dibbiny <majd@...lanox.com>
Reviewed-by: Jack Morgenstein <jackm@....mellanox.co.il>
Signed-off-by: Tariq Toukan <tariqt@...lanox.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
---
 drivers/net/ethernet/mellanox/mlx4/main.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx4/main.c b/drivers/net/ethernet/mellanox/mlx4/main.c
index 90de6e1ad06e..7fea86c06783 100644
--- a/drivers/net/ethernet/mellanox/mlx4/main.c
+++ b/drivers/net/ethernet/mellanox/mlx4/main.c
@@ -648,8 +648,6 @@ static int mlx4_slave_cap(struct mlx4_dev *dev)
 		return -ENOSYS;
 	}
 
-	mlx4_log_num_mgm_entry_size = hca_param.log_mc_entry_sz;
-
 	dev->caps.hca_core_clock = hca_param.hca_core_clock;
 
 	memset(&dev_cap, 0, sizeof(dev_cap));
-- 
2.11.0