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net/mlx5: Remove devl_unlock from mlx5_eswtich_mode_callback_enter

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The function mlx5_eswtich_mode_callback_enter() was added as a temporary
workaround once devlink instance lock was added to devlink eswitch
callbacks. However, code review and testing show that all the callbacks
part to eswitch_mode_set don't take devlink instance lock in any flow
and so unlocking devlink instance lock while entering these functions is
not needed.

Remove devl_lock from mlx5_eswtich_mode_callback_enter() and devl_unlock
from mlx5_eswtich_mode_callback_exit(). Also remove the functions
mlx5_eswtich_mode_callback_enter()/exit() as they are not needed any
more. The callback eswitch_mode_set will be treated separately in the
following patches.

Signed-off-by: Moshe Shemesh <moshe@nvidia.com>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Moshe Shemesh 2022-07-11 01:14:00 -07:00 committed by Paolo Abeni
parent 2afe46474b
commit 367dfa1212
1 changed files with 11 additions and 32 deletions
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43
drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
View File

@ -3342,27 +3342,6 @@ static int esw_inline_mode_to_devlink(u8 mlx5_mode, u8 *mode)
return 0;
}
/* FIXME: devl_unlock() followed by devl_lock() inside driver callback
* is never correct and prone to races. It's a transitional workaround,
* never repeat this pattern.
*
* This code MUST be fixed before removing devlink_mutex as it is safe
* to do only because of that mutex.
*/
static void mlx5_eswtich_mode_callback_enter(struct devlink *devlink,
struct mlx5_eswitch *esw)
{
devl_unlock(devlink);
down_write(&esw->mode_lock);
}
static void mlx5_eswtich_mode_callback_exit(struct devlink *devlink,
struct mlx5_eswitch *esw)
{
up_write(&esw->mode_lock);
devl_lock(devlink);
}
int mlx5_devlink_eswitch_mode_set(struct devlink *devlink, u16 mode,
struct netlink_ext_ack *extack)
{
@ -3431,9 +3410,9 @@ int mlx5_devlink_eswitch_mode_get(struct devlink *devlink, u16 *mode)
if (IS_ERR(esw))
return PTR_ERR(esw);
mlx5_eswtich_mode_callback_enter(devlink, esw);
down_write(&esw->mode_lock);
err = esw_mode_to_devlink(esw->mode, mode);
mlx5_eswtich_mode_callback_exit(devlink, esw);
up_write(&esw->mode_lock);
return err;
}
@ -3480,7 +3459,7 @@ int mlx5_devlink_eswitch_inline_mode_set(struct devlink *devlink, u8 mode,
if (IS_ERR(esw))
return PTR_ERR(esw);
mlx5_eswtich_mode_callback_enter(devlink, esw);
down_write(&esw->mode_lock);
switch (MLX5_CAP_ETH(dev, wqe_inline_mode)) {
case MLX5_CAP_INLINE_MODE_NOT_REQUIRED:
@ -3514,11 +3493,11 @@ int mlx5_devlink_eswitch_inline_mode_set(struct devlink *devlink, u8 mode,
goto out;
esw->offloads.inline_mode = mlx5_mode;
mlx5_eswtich_mode_callback_exit(devlink, esw);
up_write(&esw->mode_lock);
return 0;
out:
mlx5_eswtich_mode_callback_exit(devlink, esw);
up_write(&esw->mode_lock);
return err;
}
@ -3531,9 +3510,9 @@ int mlx5_devlink_eswitch_inline_mode_get(struct devlink *devlink, u8 *mode)
if (IS_ERR(esw))
return PTR_ERR(esw);
mlx5_eswtich_mode_callback_enter(devlink, esw);
down_write(&esw->mode_lock);
err = esw_inline_mode_to_devlink(esw->offloads.inline_mode, mode);
mlx5_eswtich_mode_callback_exit(devlink, esw);
up_write(&esw->mode_lock);
return err;
}
@ -3549,7 +3528,7 @@ int mlx5_devlink_eswitch_encap_mode_set(struct devlink *devlink,
if (IS_ERR(esw))
return PTR_ERR(esw);
mlx5_eswtich_mode_callback_enter(devlink, esw);
down_write(&esw->mode_lock);
if (encap != DEVLINK_ESWITCH_ENCAP_MODE_NONE &&
(!MLX5_CAP_ESW_FLOWTABLE_FDB(dev, reformat) ||
@ -3592,7 +3571,7 @@ int mlx5_devlink_eswitch_encap_mode_set(struct devlink *devlink,
}
unlock:
mlx5_eswtich_mode_callback_exit(devlink, esw);
up_write(&esw->mode_lock);
return err;
}
@ -3605,9 +3584,9 @@ int mlx5_devlink_eswitch_encap_mode_get(struct devlink *devlink,
if (IS_ERR(esw))
return PTR_ERR(esw);
mlx5_eswtich_mode_callback_enter(devlink, esw);
down_write(&esw->mode_lock);
*encap = esw->offloads.encap;
mlx5_eswtich_mode_callback_exit(devlink, esw);
up_write(&esw->mode_lock);
return 0;
}