net/mlx4_en: Schedule napi when RX buffers allocation fails

Browse source

commit 07841f9d94 upstream.

When system is out of memory, refilling of RX buffers fails while
the driver continue to pass the received packets to the kernel stack.
At some point, when all RX buffers deplete, driver may fall into a
sleep, and not recover when memory for new RX buffers is once again
availible. This is because hardware does not have valid descriptors,
so no interrupt will be generated for the driver to return to work
in napi context. Fix it by schedule the napi poll function from
stats_task delayed workqueue, as long as the allocations fail.

Signed-off-by: Ido Shamay <idos@mellanox.com>
Signed-off-by: Amir Vadai <amirv@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>

...

This commit is contained in:

Ido Shamay 2015-04-30 17:32:46 +03:00 • committed by Luis Henriques

parent 0502c51a4a

commit ddef2b7f77

3 changed files with 26 additions and 2 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

1

drivers/net/ethernet/mellanox/mlx4/en_netdev.c

View file

26

drivers/net/ethernet/mellanox/mlx4/en_rx.c

View file

1

drivers/net/ethernet/mellanox/mlx4/mlx4_en.h

View file