mirrors
/
linux-stable
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
1
0
Fork 0
Code Issues Releases Wiki Activity

net/mlx5: E-Switch, rebuild lag only when needed 

A user can enable VFs without changing E-Switch mode, this can happen
when a user moves straight to switchdev mode and only once in switchdev
VFs are enabled via the sysfs interface.

The cited commit assumed this isn't possible and exposed a single
API function where the E-switch calls into the lag code, breaks the lag
and prevents any other lag operations to take place until the
E-switch update has ended.

Breaking the hardware lag when it isn't needed can make it such that
hardware lag can't be enabled again.

In the sysfs call path check if the current E-Switch mode is NONE,
in the context of the function it can only mean the E-Switch is moving
out of NONE mode and the hardware lag should be disabled and enabled
once the mode change has ended. If the mode isn't NONE it means
VFs are about to be enabled and such operation doesn't require
toggling the hardware lag.

Fixes: cac1eb2cf2 ("net/mlx5: Lag, properly lock eswitch if needed")
Signed-off-by: Mark Bloch <mbloch@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
This commit is contained in:
Mark Bloch 2021-11-10 15:19:12 +00:00 committed by Saeed Mahameed
parent ba50cd9451
commit 2eb0cb31bc
1 changed files with 10 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
drivers/net/ethernet/mellanox/mlx5/core/eswitch.c
View File

@ -1305,12 +1305,17 @@ abort:
*/
int mlx5_eswitch_enable(struct mlx5_eswitch *esw, int num_vfs)
{
bool toggle_lag;
int ret;
if (!mlx5_esw_allowed(esw))
return 0;
mlx5_lag_disable_change(esw->dev);
toggle_lag = esw->mode == MLX5_ESWITCH_NONE;
if (toggle_lag)
mlx5_lag_disable_change(esw->dev);
down_write(&esw->mode_lock);
if (esw->mode == MLX5_ESWITCH_NONE) {
ret = mlx5_eswitch_enable_locked(esw, MLX5_ESWITCH_LEGACY, num_vfs);
@ -1324,7 +1329,10 @@ int mlx5_eswitch_enable(struct mlx5_eswitch *esw, int num_vfs)
esw->esw_funcs.num_vfs = num_vfs;
}
up_write(&esw->mode_lock);
mlx5_lag_enable_change(esw->dev);
if (toggle_lag)
mlx5_lag_enable_change(esw->dev);
return ret;
}