Commit afd02cd3 authored Nov 27, 2016 by Eli Cohen Committed by Doug Ledford Dec 13, 2016

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: e126ba97 ('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>

parent c73b7911

drivers/infiniband/hw/mlx5/mr.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -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;