net/mlx5e: Replace async events spinlock with synchronize_irq()

We only need to flush the irq handler to make sure it does not
queue a work into the global work queue after we start to flush it.
So using synchronize_irq() is more appropriate than a spin lock.

Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en.h b/drivers/net/ethernet/mellanox/mlx5/core/en.h
index 1dca3dc..4511984 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/en.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en.h
@@ -555,7 +555,6 @@ struct mlx5e_priv {
        struct mlx5e_vxlan_db      vxlan;
 
        struct mlx5e_params        params;
-       spinlock_t                 async_events_spinlock; /* sync hw events */
        struct work_struct         update_carrier_work;
        struct work_struct         set_rx_mode_work;
        struct delayed_work        update_stats_work;

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index 0d45f35..38944b8 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -275,9 +275,14 @@ static void mlx5e_update_stats_work(struct work_struct *work)
        mutex_unlock(&priv->state_lock);
 }
 
-static void __mlx5e_async_event(struct mlx5e_priv *priv,
-                               enum mlx5_dev_event event)
+static void mlx5e_async_event(struct mlx5_core_dev *mdev, void *vpriv,
+                             enum mlx5_dev_event event, unsigned long param)
 {
+       struct mlx5e_priv *priv = vpriv;
+
+       if (!test_bit(MLX5E_STATE_ASYNC_EVENTS_ENABLE, &priv->state))
+               return;
+
        switch (event) {
        case MLX5_DEV_EVENT_PORT_UP:
        case MLX5_DEV_EVENT_PORT_DOWN:
@@ -289,17 +294,6 @@ static void __mlx5e_async_event(struct mlx5e_priv *priv,
        }
 }
 
-static void mlx5e_async_event(struct mlx5_core_dev *mdev, void *vpriv,
-                             enum mlx5_dev_event event, unsigned long param)
-{
-       struct mlx5e_priv *priv = vpriv;
-
-       spin_lock(&priv->async_events_spinlock);
-       if (test_bit(MLX5E_STATE_ASYNC_EVENTS_ENABLE, &priv->state))
-               __mlx5e_async_event(priv, event);
-       spin_unlock(&priv->async_events_spinlock);
-}
-
 static void mlx5e_enable_async_events(struct mlx5e_priv *priv)
 {
        set_bit(MLX5E_STATE_ASYNC_EVENTS_ENABLE, &priv->state);
@@ -307,9 +301,8 @@ static void mlx5e_enable_async_events(struct mlx5e_priv *priv)
 
 static void mlx5e_disable_async_events(struct mlx5e_priv *priv)
 {
-       spin_lock_irq(&priv->async_events_spinlock);
        clear_bit(MLX5E_STATE_ASYNC_EVENTS_ENABLE, &priv->state);
-       spin_unlock_irq(&priv->async_events_spinlock);
+       synchronize_irq(mlx5_get_msix_vec(priv->mdev, MLX5_EQ_VEC_ASYNC));
 }
 
 #define MLX5E_HW2SW_MTU(hwmtu) (hwmtu - (ETH_HLEN + VLAN_HLEN + ETH_FCS_LEN))
@@ -2290,7 +2283,6 @@ static void mlx5e_build_netdev_priv(struct mlx5_core_dev *mdev,
        mlx5e_ets_init(priv);
 #endif
 
-       spin_lock_init(&priv->async_events_spinlock);
        mutex_init(&priv->state_lock);
 
        INIT_WORK(&priv->update_carrier_work, mlx5e_update_carrier_work);

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eq.c b/drivers/net/ethernet/mellanox/mlx5/core/eq.c
index 647a3ca..18fccec 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/eq.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/eq.c
@@ -442,6 +442,11 @@ int mlx5_destroy_unmap_eq(struct mlx5_core_dev *dev, struct mlx5_eq *eq)
 }
 EXPORT_SYMBOL_GPL(mlx5_destroy_unmap_eq);
 
+u32 mlx5_get_msix_vec(struct mlx5_core_dev *dev, int vecidx)
+{
+       return dev->priv.msix_arr[MLX5_EQ_VEC_ASYNC].vector;
+}
+
 int mlx5_eq_init(struct mlx5_core_dev *dev)
 {
        int err;

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h b/drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h
index 0336847..0b0b226 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h
@@ -99,6 +99,7 @@ int mlx5_core_enable_hca(struct mlx5_core_dev *dev, u16 func_id);
 int mlx5_core_disable_hca(struct mlx5_core_dev *dev, u16 func_id);
 int mlx5_wait_for_vf_pages(struct mlx5_core_dev *dev);
 cycle_t mlx5_read_internal_timer(struct mlx5_core_dev *dev);
+u32 mlx5_get_msix_vec(struct mlx5_core_dev *dev, int vecidx);
 
 void mlx5e_init(void);
 void mlx5e_cleanup(void);