This is a note to let you know that I've just added the patch titled
net/mlx5: E-Switch, Change mode lock from mutex to rw semaphore
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
net-mlx5-e-switch-change-mode-lock-from-mutex-to-rw-.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 105526ab6db50b4e941d2c7535a695a9e757a8c8
Author: Roi Dayan <roid@xxxxxxxxxx>
Date: Wed Sep 16 10:11:42 2020 +0300
net/mlx5: E-Switch, Change mode lock from mutex to rw semaphore
[ Upstream commit c55479d0cb6a28029844d0e90730704a0fb5efd3 ]
E-Switch mode change routine will take the write lock to prevent any
consumer to access the E-Switch resources while E-Switch is going
through a mode change.
In the next patch
E-Switch consumers (e.g vport representors) will take read_lock prior to
accessing E-Switch resources to prevent E-Switch mode changing in the
middle of the operation.
Signed-off-by: Roi Dayan <roid@xxxxxxxxxx>
Reviewed-by: Parav Pandit <parav@xxxxxxxxxx>
Signed-off-by: Saeed Mahameed <saeedm@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eswitch.c b/drivers/net/ethernet/mellanox/mlx5/core/eswitch.c
index 401b2f5128dd4..78cc6f0bbc72b 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/eswitch.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/eswitch.c
@@ -1663,7 +1663,7 @@ int mlx5_eswitch_enable(struct mlx5_eswitch *esw, int num_vfs)
if (!ESW_ALLOWED(esw))
return 0;
- mutex_lock(&esw->mode_lock);
+ down_write(&esw->mode_lock);
if (esw->mode == MLX5_ESWITCH_NONE) {
ret = mlx5_eswitch_enable_locked(esw, MLX5_ESWITCH_LEGACY, num_vfs);
} else {
@@ -1675,7 +1675,7 @@ int mlx5_eswitch_enable(struct mlx5_eswitch *esw, int num_vfs)
if (!ret)
esw->esw_funcs.num_vfs = num_vfs;
}
- mutex_unlock(&esw->mode_lock);
+ up_write(&esw->mode_lock);
return ret;
}
@@ -1719,10 +1719,10 @@ void mlx5_eswitch_disable(struct mlx5_eswitch *esw, bool clear_vf)
if (!ESW_ALLOWED(esw))
return;
- mutex_lock(&esw->mode_lock);
+ down_write(&esw->mode_lock);
mlx5_eswitch_disable_locked(esw, clear_vf);
esw->esw_funcs.num_vfs = 0;
- mutex_unlock(&esw->mode_lock);
+ up_write(&esw->mode_lock);
}
int mlx5_eswitch_init(struct mlx5_core_dev *dev)
@@ -1778,7 +1778,7 @@ int mlx5_eswitch_init(struct mlx5_core_dev *dev)
atomic64_set(&esw->offloads.num_flows, 0);
ida_init(&esw->offloads.vport_metadata_ida);
mutex_init(&esw->state_lock);
- mutex_init(&esw->mode_lock);
+ init_rwsem(&esw->mode_lock);
mlx5_esw_for_all_vports(esw, i, vport) {
vport->vport = mlx5_eswitch_index_to_vport_num(esw, i);
@@ -1813,7 +1813,6 @@ void mlx5_eswitch_cleanup(struct mlx5_eswitch *esw)
esw->dev->priv.eswitch = NULL;
destroy_workqueue(esw->work_queue);
esw_offloads_cleanup_reps(esw);
- mutex_destroy(&esw->mode_lock);
mutex_destroy(&esw->state_lock);
ida_destroy(&esw->offloads.vport_metadata_ida);
mlx5e_mod_hdr_tbl_destroy(&esw->offloads.mod_hdr);
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eswitch.h b/drivers/net/ethernet/mellanox/mlx5/core/eswitch.h
index cf87de94418ff..59c674f157a8c 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/eswitch.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/eswitch.h
@@ -262,7 +262,7 @@ struct mlx5_eswitch {
/* Protects eswitch mode change that occurs via one or more
* user commands, i.e. sriov state change, devlink commands.
*/
- struct mutex mode_lock;
+ struct rw_semaphore mode_lock;
struct {
bool enabled;
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c b/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
index 5801f55ff0771..164e8cd9ad4ad 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/eswitch_offloads.c
@@ -2508,7 +2508,7 @@ int mlx5_devlink_eswitch_mode_set(struct devlink *devlink, u16 mode,
if (esw_mode_from_devlink(mode, &mlx5_mode))
return -EINVAL;
- mutex_lock(&esw->mode_lock);
+ down_write(&esw->mode_lock);
cur_mlx5_mode = esw->mode;
if (cur_mlx5_mode == mlx5_mode)
goto unlock;
@@ -2521,7 +2521,7 @@ int mlx5_devlink_eswitch_mode_set(struct devlink *devlink, u16 mode,
err = -EINVAL;
unlock:
- mutex_unlock(&esw->mode_lock);
+ up_write(&esw->mode_lock);
return err;
}
@@ -2534,14 +2534,14 @@ int mlx5_devlink_eswitch_mode_get(struct devlink *devlink, u16 *mode)
if (IS_ERR(esw))
return PTR_ERR(esw);
- mutex_lock(&esw->mode_lock);
+ down_write(&esw->mode_lock);
err = eswitch_devlink_esw_mode_check(esw);
if (err)
goto unlock;
err = esw_mode_to_devlink(esw->mode, mode);
unlock:
- mutex_unlock(&esw->mode_lock);
+ up_write(&esw->mode_lock);
return err;
}
@@ -2557,7 +2557,7 @@ int mlx5_devlink_eswitch_inline_mode_set(struct devlink *devlink, u8 mode,
if (IS_ERR(esw))
return PTR_ERR(esw);
- mutex_lock(&esw->mode_lock);
+ down_write(&esw->mode_lock);
err = eswitch_devlink_esw_mode_check(esw);
if (err)
goto out;
@@ -2599,7 +2599,7 @@ int mlx5_devlink_eswitch_inline_mode_set(struct devlink *devlink, u8 mode,
}
esw->offloads.inline_mode = mlx5_mode;
- mutex_unlock(&esw->mode_lock);
+ up_write(&esw->mode_lock);
return 0;
revert_inline_mode:
@@ -2609,7 +2609,7 @@ int mlx5_devlink_eswitch_inline_mode_set(struct devlink *devlink, u8 mode,
vport,
esw->offloads.inline_mode);
out:
- mutex_unlock(&esw->mode_lock);
+ up_write(&esw->mode_lock);
return err;
}
@@ -2622,14 +2622,14 @@ int mlx5_devlink_eswitch_inline_mode_get(struct devlink *devlink, u8 *mode)
if (IS_ERR(esw))
return PTR_ERR(esw);
- mutex_lock(&esw->mode_lock);
+ down_write(&esw->mode_lock);
err = eswitch_devlink_esw_mode_check(esw);
if (err)
goto unlock;
err = esw_inline_mode_to_devlink(esw->offloads.inline_mode, mode);
unlock:
- mutex_unlock(&esw->mode_lock);
+ up_write(&esw->mode_lock);
return err;
}
@@ -2645,7 +2645,7 @@ int mlx5_devlink_eswitch_encap_mode_set(struct devlink *devlink,
if (IS_ERR(esw))
return PTR_ERR(esw);
- mutex_lock(&esw->mode_lock);
+ down_write(&esw->mode_lock);
err = eswitch_devlink_esw_mode_check(esw);
if (err)
goto unlock;
@@ -2691,7 +2691,7 @@ int mlx5_devlink_eswitch_encap_mode_set(struct devlink *devlink,
}
unlock:
- mutex_unlock(&esw->mode_lock);
+ up_write(&esw->mode_lock);
return err;
}
@@ -2706,14 +2706,14 @@ int mlx5_devlink_eswitch_encap_mode_get(struct devlink *devlink,
return PTR_ERR(esw);
- mutex_lock(&esw->mode_lock);
+ down_write(&esw->mode_lock);
err = eswitch_devlink_esw_mode_check(esw);
if (err)
goto unlock;
*encap = esw->offloads.encap;
unlock:
- mutex_unlock(&esw->mode_lock);
+ up_write(&esw->mode_lock);
return 0;
}
