net/mlx5e: Attach/detach XDP program safely
authorMaxim Mikityanskiy <maximmi@mellanox.com>
Wed, 26 Jun 2019 14:35:23 +0000 (17:35 +0300)
committerDaniel Borkmann <daniel@iogearbox.net>
Thu, 27 Jun 2019 20:53:26 +0000 (22:53 +0200)
commite18953240de8b46360a67090c87ee1ef8160b35d
tree5dce2cb2266d1244f8725dc233aeec2a5307dc6a
parente5c891a349d7c556b7b9dc231d6dd78e88a29e5c
net/mlx5e: Attach/detach XDP program safely

When an XDP program is set, a full reopen of all channels happens in two
cases:

1. When there was no program set, and a new one is being set.

2. When there was a program set, but it's being unset.

The full reopen is necessary, because the channel parameters may change
if XDP is enabled or disabled. However, it's performed in an unsafe way:
if the new channels fail to open, the old ones are already closed, and
the interface goes down. Use the safe way to switch channels instead.
The same way is already used for other configuration changes.

Signed-off-by: Maxim Mikityanskiy <maximmi@mellanox.com>
Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
drivers/net/ethernet/mellanox/mlx5/core/en_main.c