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Date:   Tue, 24 Jan 2017 08:54:04 +0100
From:   Greg Kroah-Hartman <>
Cc:     Greg Kroah-Hartman <>,, Eli Cohen <>,
        Maor Gottlieb <>,
        Leon Romanovsky <>,
        Doug Ledford <>
Subject: [PATCH 4.9 004/130] IB/mlx5: Avoid system crash when enabling many VFs

4.9-stable review patch.  If anyone has any objections, please let me know.


From: Eli Cohen <>

commit afd02cd3a9b6c04b41d946b5d7f6e17b3fc30c6b upstream.

When enabling many VFs, the total amount of DMA mappings increase
significantly. This causes DMA allocations to take a lot of time
since they are serialized in the kernel.

As a result the driver enters into fatal condition due to
timeout and the system hangs. To recover from this we disable
MR cache for VFs.

PFs will still have a full cache and VFs cache can be manipulated
as usual after driver load.

Fixes: e126ba97dba9 ('mlx5: Add driver for Mellanox Connect-IB adapters')
Signed-off-by: Eli Cohen <>
Signed-off-by: Maor Gottlieb <>
Signed-off-by: Leon Romanovsky <>
Signed-off-by: Doug Ledford <>
Signed-off-by: Greg Kroah-Hartman <>

 drivers/infiniband/hw/mlx5/mr.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/infiniband/hw/mlx5/mr.c
+++ b/drivers/infiniband/hw/mlx5/mr.c
@@ -628,7 +628,8 @@ int mlx5_mr_cache_init(struct mlx5_ib_de
 		ent->order = i + 2;
 		ent->dev = dev;
-		if (dev->mdev->profile->mask & MLX5_PROF_MASK_MR_CACHE)
+		if ((dev->mdev->profile->mask & MLX5_PROF_MASK_MR_CACHE) &&
+		    (mlx5_core_is_pf(dev->mdev)))
 			limit = dev->mdev->profile->mr_cache[i].limit;
 			limit = 0;

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