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IB/mlx5: Avoid system crash when enabling many VFs 

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: e126ba97db ('mlx5: Add driver for Mellanox Connect-IB adapters')
Signed-off-by: Eli Cohen <eli@mellanox.com>
Signed-off-by: Maor Gottlieb <maorg@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Eli Cohen 2016-11-27 15:18:21 +02:00 committed by Doug Ledford
parent c73b7911de
commit afd02cd3a9
1 changed files with 2 additions and 1 deletions
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3
drivers/infiniband/hw/mlx5/mr.c
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@ -627,7 +627,8 @@ int mlx5_mr_cache_init(struct mlx5_ib_dev *dev)
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;
else
limit = 0;