mlx5: remove ndo_poll_controller
authorEric Dumazet <edumazet@google.com>
Fri, 21 Sep 2018 22:27:48 +0000 (15:27 -0700)
committerDavid S. Miller <davem@davemloft.net>
Mon, 24 Sep 2018 04:55:25 +0000 (21:55 -0700)
commit9c29bcd189f4ab1644b7125713602532d0aefdb7
tree583a463ebef9a9fafdec28c33452758176404fec
parenta24b66c249f71dde11da5ba3b4c397a42ece3fc9
mlx5: remove ndo_poll_controller

As diagnosed by Song Liu, ndo_poll_controller() can
be very dangerous on loaded hosts, since the cpu
calling ndo_poll_controller() might steal all NAPI
contexts (for all RX/TX queues of the NIC). This capture
can last for unlimited amount of time, since one
cpu is generally not able to drain all the queues under load.

mlx5 uses NAPI for TX completions, so we better let core
networking stack call the napi->poll() to avoid the capture.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
drivers/net/ethernet/mellanox/mlx5/core/en_main.c