IB/mlx5: Avoid system crash when enabling many VFs

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commit afd02cd3a9 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: 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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Eli Cohen 2016-11-27 15:18:21 +02:00 • committed by Greg Kroah-Hartman

parent 45f3a7eb2c

commit 4db097fe49

1 changed files with 2 additions and 1 deletions

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drivers/infiniband/hw/mlx5/mr.c

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