@@ -4323,6 +4323,11 @@ int mlx5e_configure_flower(struct net_device *dev, struct mlx5e_priv *priv,
struct mlx5e_tc_flow *flow;
int err = 0;
+ if (!mlx5_esw_hold(priv->mdev))
+ return -EAGAIN;
+
+ mlx5_esw_get(priv->mdev);
+
rcu_read_lock();
flow = rhashtable_lookup(tc_ht, &f->cookie, tc_ht_params);
if (flow) {
@@ -4360,11 +4365,14 @@ int mlx5e_configure_flower(struct net_device *dev, struct mlx5e_priv *priv,
if (err)
goto err_free;
+ mlx5_esw_release(priv->mdev);
return 0;
err_free:
mlx5e_flow_put(priv, flow);
out:
+ mlx5_esw_put(priv->mdev);
+ mlx5_esw_release(priv->mdev);
return err;
}
@@ -4404,6 +4412,7 @@ int mlx5e_delete_flower(struct net_device *dev, struct mlx5e_priv *priv,
trace_mlx5e_delete_flower(f);
mlx5e_flow_put(priv, flow);
+ mlx5_esw_put(priv->mdev);
return 0;
errout:
@@ -435,6 +435,7 @@ static void esw_destroy_legacy_fdb_table(struct mlx5_eswitch *esw)
esw->fdb_table.legacy.addr_grp = NULL;
esw->fdb_table.legacy.allmulti_grp = NULL;
esw->fdb_table.legacy.promisc_grp = NULL;
+ atomic64_set(&esw->user_count, 0);
}
static int esw_create_legacy_table(struct mlx5_eswitch *esw)
@@ -442,6 +443,7 @@ static int esw_create_legacy_table(struct mlx5_eswitch *esw)
int err;
memset(&esw->fdb_table.legacy, 0, sizeof(struct legacy_fdb));
+ atomic64_set(&esw->user_count, 0);
err = esw_create_legacy_vepa_table(esw);
if (err)
@@ -2581,3 +2583,94 @@ void mlx5_esw_event_notifier_unregister(struct mlx5_eswitch *esw, struct notifie
{
blocking_notifier_chain_unregister(&esw->n_head, nb);
}
+
+/**
+ * mlx5_esw_hold() - Try to take a read lock on esw mode lock.
+ * @mdev: mlx5 core device.
+ *
+ * Should be called by esw resources callers.
+ *
+ * Return: true on success or false.
+ */
+bool mlx5_esw_hold(struct mlx5_core_dev *mdev)
+{
+ struct mlx5_eswitch *esw = mdev->priv.eswitch;
+
+ /* e.g. VF doesn't have eswitch so nothing to do */
+ if (!ESW_ALLOWED(esw))
+ return true;
+
+ if (down_read_trylock(&esw->mode_lock) != 0)
+ return true;
+
+ return false;
+}
+
+/**
+ * mlx5_esw_release() - Release a read lock on esw mode lock.
+ * @mdev: mlx5 core device.
+ */
+void mlx5_esw_release(struct mlx5_core_dev *mdev)
+{
+ struct mlx5_eswitch *esw = mdev->priv.eswitch;
+
+ if (ESW_ALLOWED(esw))
+ up_read(&esw->mode_lock);
+}
+
+/**
+ * mlx5_esw_get() - Increase esw user count.
+ * @mdev: mlx5 core device.
+ */
+void mlx5_esw_get(struct mlx5_core_dev *mdev)
+{
+ struct mlx5_eswitch *esw = mdev->priv.eswitch;
+
+ if (ESW_ALLOWED(esw))
+ atomic64_inc(&esw->user_count);
+}
+
+/**
+ * mlx5_esw_put() - Decrease esw user count.
+ * @mdev: mlx5 core device.
+ */
+void mlx5_esw_put(struct mlx5_core_dev *mdev)
+{
+ struct mlx5_eswitch *esw = mdev->priv.eswitch;
+
+ if (ESW_ALLOWED(esw))
+ atomic64_dec_if_positive(&esw->user_count);
+}
+
+/**
+ * mlx5_esw_try_lock() - Take a write lock on esw mode lock.
+ * @esw: eswitch device.
+ *
+ * Should be called by esw mode change routine.
+ *
+ * Return:
+ * * 0 - esw mode if successfully locked and refcount is 0.
+ * * -EBUSY - refcount is not 0.
+ * * -EINVAL - In the middle of switching mode or lock is already held.
+ */
+int mlx5_esw_try_lock(struct mlx5_eswitch *esw)
+{
+ if (down_write_trylock(&esw->mode_lock) == 0)
+ return -EINVAL;
+
+ if (atomic64_read(&esw->user_count) > 0) {
+ up_write(&esw->mode_lock);
+ return -EBUSY;
+ }
+
+ return esw->mode;
+}
+
+/**
+ * mlx5_esw_unlock() - Release write lock on esw mode lock
+ * @esw: eswitch device.
+ */
+void mlx5_esw_unlock(struct mlx5_eswitch *esw)
+{
+ up_write(&esw->mode_lock);
+}
@@ -272,6 +272,7 @@ struct mlx5_eswitch {
* user commands, i.e. sriov state change, devlink commands.
*/
struct rw_semaphore mode_lock;
+ atomic64_t user_count;
struct {
bool enabled;
@@ -761,6 +762,14 @@ struct mlx5_esw_event_info {
int mlx5_esw_event_notifier_register(struct mlx5_eswitch *esw, struct notifier_block *n);
void mlx5_esw_event_notifier_unregister(struct mlx5_eswitch *esw, struct notifier_block *n);
+
+bool mlx5_esw_hold(struct mlx5_core_dev *dev);
+void mlx5_esw_release(struct mlx5_core_dev *dev);
+void mlx5_esw_get(struct mlx5_core_dev *dev);
+void mlx5_esw_put(struct mlx5_core_dev *dev);
+int mlx5_esw_try_lock(struct mlx5_eswitch *esw);
+void mlx5_esw_unlock(struct mlx5_eswitch *esw);
+
#else /* CONFIG_MLX5_ESWITCH */
/* eswitch API stubs */
static inline int mlx5_eswitch_init(struct mlx5_core_dev *dev) { return 0; }
@@ -1854,6 +1854,7 @@ static void esw_destroy_offloads_fdb_tables(struct mlx5_eswitch *esw)
/* Holds true only as long as DMFS is the default */
mlx5_flow_namespace_set_mode(esw->fdb_table.offloads.ns,
MLX5_FLOW_STEERING_MODE_DMFS);
+ atomic64_set(&esw->user_count, 0);
}
static int esw_create_offloads_table(struct mlx5_eswitch *esw)
@@ -2584,6 +2585,7 @@ static int esw_offloads_steering_init(struct mlx5_eswitch *esw)
memset(&esw->fdb_table.offloads, 0, sizeof(struct offloads_fdb));
mutex_init(&esw->fdb_table.offloads.vports.lock);
hash_init(esw->fdb_table.offloads.vports.table);
+ atomic64_set(&esw->user_count, 0);
indir = mlx5_esw_indir_table_init();
if (IS_ERR(indir)) {
@@ -2925,8 +2927,14 @@ int mlx5_devlink_eswitch_mode_set(struct devlink *devlink, u16 mode,
if (esw_mode_from_devlink(mode, &mlx5_mode))
return -EINVAL;
- down_write(&esw->mode_lock);
- cur_mlx5_mode = esw->mode;
+ err = mlx5_esw_try_lock(esw);
+ if (err < 0) {
+ NL_SET_ERR_MSG_MOD(extack, "Can't change mode, E-Switch is busy");
+ return err;
+ }
+ cur_mlx5_mode = err;
+ err = 0;
+
if (cur_mlx5_mode == mlx5_mode)
goto unlock;
@@ -2938,7 +2946,7 @@ int mlx5_devlink_eswitch_mode_set(struct devlink *devlink, u16 mode,
err = -EINVAL;
unlock:
- up_write(&esw->mode_lock);
+ mlx5_esw_unlock(esw);
return err;
}