Merge branch 'mlx5-fixes'

Saeed Mahameed says:

====================
Mellanox 100G mlx5 fixes for 4.6-rc

This small series provides some bug fixes for mlx5 driver.

A small bug fix for iounmap of a null pointer, which dumps a warning on some archs.

One patch to fix the VXLAN/MLX5_EN dependency issue reported by Arnd.

Two patches to fix the scheduling while atomic issue for ndo_add/del_vxlan_port
NDOs.  The first will add an internal mlx5e workqueue and the second will
delegate vxlan ports add/del requests to that workqueue.

Note: ('net/mlx5: Kconfig: Fix MLX5_EN/VXLAN build issue') is only needed for net
and not net-next as the issue was globally fixed for all device drivers by:
b7aade15485a ('vxlan: break dependency with netdev drivers') in net-next.

Applied on top: f27337e16f2d ('ip_tunnel: fix preempt warning in ip tunnel creation/updating')
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

6 files changed, 74 insertions, 29 deletions

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/Kconfig b/drivers/net/ethernet/mellanox/mlx5/core/Kconfig
index 1cf722eba607..559d11a443bc 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/Kconfig
+++ b/drivers/net/ethernet/mellanox/mlx5/core/Kconfig
@@ -14,6 +14,7 @@ config MLX5_CORE_EN
 	bool "Mellanox Technologies ConnectX-4 Ethernet support"
 	depends on NETDEVICES && ETHERNET && PCI && MLX5_CORE
 	select PTP_1588_CLOCK
+	select VXLAN if MLX5_CORE=y
 	default n
 	---help---
 	  Ethernet support in Mellanox Technologies ConnectX-4 NIC.
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en.h b/drivers/net/ethernet/mellanox/mlx5/core/en.h
index e80ce94b5dcf..3881dce0cc30 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en.h
@@ -567,6 +567,7 @@ struct mlx5e_priv {
 	struct mlx5e_vxlan_db      vxlan;
 
 	struct mlx5e_params        params;
+	struct workqueue_struct    *wq;
 	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 67d548b70e14..d4dfc5ce516a 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -262,9 +262,8 @@ static void mlx5e_update_stats_work(struct work_struct *work)
 	mutex_lock(&priv->state_lock);
 	if (test_bit(MLX5E_STATE_OPENED, &priv->state)) {
 		mlx5e_update_stats(priv);
-		schedule_delayed_work(dwork,
-				      msecs_to_jiffies(
-					      MLX5E_UPDATE_STATS_INTERVAL));
+		queue_delayed_work(priv->wq, dwork,
+				   msecs_to_jiffies(MLX5E_UPDATE_STATS_INTERVAL));
 	}
 	mutex_unlock(&priv->state_lock);
 }
@@ -280,7 +279,7 @@ static void mlx5e_async_event(struct mlx5_core_dev *mdev, void *vpriv,
 	switch (event) {
 	case MLX5_DEV_EVENT_PORT_UP:
 	case MLX5_DEV_EVENT_PORT_DOWN:
-		schedule_work(&priv->update_carrier_work);
+		queue_work(priv->wq, &priv->update_carrier_work);
 		break;
 
 	default:
@@ -1505,7 +1504,7 @@ int mlx5e_open_locked(struct net_device *netdev)
 	mlx5e_update_carrier(priv);
 	mlx5e_timestamp_init(priv);
 
-	schedule_delayed_work(&priv->update_stats_work, 0);
+	queue_delayed_work(priv->wq, &priv->update_stats_work, 0);
 
 	return 0;
 
@@ -1961,7 +1960,7 @@ static void mlx5e_set_rx_mode(struct net_device *dev)
 {
 	struct mlx5e_priv *priv = netdev_priv(dev);
 
-	schedule_work(&priv->set_rx_mode_work);
+	queue_work(priv->wq, &priv->set_rx_mode_work);
 }
 
 static int mlx5e_set_mac(struct net_device *netdev, void *addr)
@@ -1976,7 +1975,7 @@ static int mlx5e_set_mac(struct net_device *netdev, void *addr)
 	ether_addr_copy(netdev->dev_addr, saddr->sa_data);
 	netif_addr_unlock_bh(netdev);
 
-	schedule_work(&priv->set_rx_mode_work);
+	queue_work(priv->wq, &priv->set_rx_mode_work);
 
 	return 0;
 }
@@ -2158,7 +2157,7 @@ static void mlx5e_add_vxlan_port(struct net_device *netdev,
 	if (!mlx5e_vxlan_allowed(priv->mdev))
 		return;
 
-	mlx5e_vxlan_add_port(priv, be16_to_cpu(port));
+	mlx5e_vxlan_queue_work(priv, sa_family, be16_to_cpu(port), 1);
 }
 
 static void mlx5e_del_vxlan_port(struct net_device *netdev,
@@ -2169,7 +2168,7 @@ static void mlx5e_del_vxlan_port(struct net_device *netdev,
 	if (!mlx5e_vxlan_allowed(priv->mdev))
 		return;
 
-	mlx5e_vxlan_del_port(priv, be16_to_cpu(port));
+	mlx5e_vxlan_queue_work(priv, sa_family, be16_to_cpu(port), 0);
 }
 
 static netdev_features_t mlx5e_vxlan_features_check(struct mlx5e_priv *priv,
@@ -2498,10 +2497,14 @@ static void *mlx5e_create_netdev(struct mlx5_core_dev *mdev)
 
 	priv = netdev_priv(netdev);
 
+	priv->wq = create_singlethread_workqueue("mlx5e");
+	if (!priv->wq)
+		goto err_free_netdev;
+
 	err = mlx5_alloc_map_uar(mdev, &priv->cq_uar, false);
 	if (err) {
 		mlx5_core_err(mdev, "alloc_map uar failed, %d\n", err);
-		goto err_free_netdev;
+		goto err_destroy_wq;
 	}
 
 	err = mlx5_core_alloc_pd(mdev, &priv->pdn);
@@ -2580,7 +2583,7 @@ static void *mlx5e_create_netdev(struct mlx5_core_dev *mdev)
 		vxlan_get_rx_port(netdev);
 
 	mlx5e_enable_async_events(priv);
-	schedule_work(&priv->set_rx_mode_work);
+	queue_work(priv->wq, &priv->set_rx_mode_work);
 
 	return priv;
 
@@ -2617,6 +2620,9 @@ err_dealloc_pd:
 err_unmap_free_uar:
 	mlx5_unmap_free_uar(mdev, &priv->cq_uar);
 
+err_destroy_wq:
+	destroy_workqueue(priv->wq);
+
 err_free_netdev:
 	free_netdev(netdev);
 
@@ -2630,9 +2636,9 @@ static void mlx5e_destroy_netdev(struct mlx5_core_dev *mdev, void *vpriv)
 
 	set_bit(MLX5E_STATE_DESTROYING, &priv->state);
 
-	schedule_work(&priv->set_rx_mode_work);
+	queue_work(priv->wq, &priv->set_rx_mode_work);
 	mlx5e_disable_async_events(priv);
-	flush_scheduled_work();
+	flush_workqueue(priv->wq);
 	if (test_bit(MLX5_INTERFACE_STATE_SHUTDOWN, &mdev->intf_state)) {
 		netif_device_detach(netdev);
 		mutex_lock(&priv->state_lock);
@@ -2655,6 +2661,8 @@ static void mlx5e_destroy_netdev(struct mlx5_core_dev *mdev, void *vpriv)
 	mlx5_core_dealloc_transport_domain(priv->mdev, priv->tdn);
 	mlx5_core_dealloc_pd(priv->mdev, priv->pdn);
 	mlx5_unmap_free_uar(priv->mdev, &priv->cq_uar);
+	cancel_delayed_work_sync(&priv->update_stats_work);
+	destroy_workqueue(priv->wq);
 
 	if (!test_bit(MLX5_INTERFACE_STATE_SHUTDOWN, &mdev->intf_state))
 		free_netdev(netdev);
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/uar.c b/drivers/net/ethernet/mellanox/mlx5/core/uar.c
index 8ba080e441a1..5ff8af472bf5 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/uar.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/uar.c
@@ -269,8 +269,10 @@ EXPORT_SYMBOL(mlx5_alloc_map_uar);
 
 void mlx5_unmap_free_uar(struct mlx5_core_dev *mdev, struct mlx5_uar *uar)
 {
-	iounmap(uar->map);
-	iounmap(uar->bf_map);
+	if (uar->map)
+		iounmap(uar->map);
+	else
+		iounmap(uar->bf_map);
 	mlx5_cmd_free_uar(mdev, uar->index);
 }
 EXPORT_SYMBOL(mlx5_unmap_free_uar);
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/vxlan.c b/drivers/net/ethernet/mellanox/mlx5/core/vxlan.c
index 9f10df25f3cd..f2fd1ef16da7 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/vxlan.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/vxlan.c
@@ -95,21 +95,22 @@ struct mlx5e_vxlan *mlx5e_vxlan_lookup_port(struct mlx5e_priv *priv, u16 port)
 	return vxlan;
 }
 
-int mlx5e_vxlan_add_port(struct mlx5e_priv *priv, u16 port)
+static void mlx5e_vxlan_add_port(struct work_struct *work)
 {
+	struct mlx5e_vxlan_work *vxlan_work =
+		container_of(work, struct mlx5e_vxlan_work, work);
+	struct mlx5e_priv *priv = vxlan_work->priv;
 	struct mlx5e_vxlan_db *vxlan_db = &priv->vxlan;
+	u16 port = vxlan_work->port;
 	struct mlx5e_vxlan *vxlan;
 	int err;
 
-	err = mlx5e_vxlan_core_add_port_cmd(priv->mdev, port);
-	if (err)
-		return err;
+	if (mlx5e_vxlan_core_add_port_cmd(priv->mdev, port))
+		goto free_work;
 
 	vxlan = kzalloc(sizeof(*vxlan), GFP_KERNEL);
-	if (!vxlan) {
-		err = -ENOMEM;
+	if (!vxlan)
 		goto err_delete_port;
-	}
 
 	vxlan->udp_port = port;
 
@@ -119,13 +120,14 @@ int mlx5e_vxlan_add_port(struct mlx5e_priv *priv, u16 port)
 	if (err)
 		goto err_free;
 
-	return 0;
+	goto free_work;
 
 err_free:
 	kfree(vxlan);
 err_delete_port:
 	mlx5e_vxlan_core_del_port_cmd(priv->mdev, port);
-	return err;
+free_work:
+	kfree(vxlan_work);
 }
 
 static void __mlx5e_vxlan_core_del_port(struct mlx5e_priv *priv, u16 port)
@@ -145,12 +147,36 @@ static void __mlx5e_vxlan_core_del_port(struct mlx5e_priv *priv, u16 port)
 	kfree(vxlan);
 }
 
-void mlx5e_vxlan_del_port(struct mlx5e_priv *priv, u16 port)
+static void mlx5e_vxlan_del_port(struct work_struct *work)
 {
-	if (!mlx5e_vxlan_lookup_port(priv, port))
-		return;
+	struct mlx5e_vxlan_work *vxlan_work =
+		container_of(work, struct mlx5e_vxlan_work, work);
+	struct mlx5e_priv *priv = vxlan_work->priv;
+	u16 port = vxlan_work->port;
 
 	__mlx5e_vxlan_core_del_port(priv, port);
+
+	kfree(vxlan_work);
+}
+
+void mlx5e_vxlan_queue_work(struct mlx5e_priv *priv, sa_family_t sa_family,
+			    u16 port, int add)
+{
+	struct mlx5e_vxlan_work *vxlan_work;
+
+	vxlan_work = kmalloc(sizeof(*vxlan_work), GFP_ATOMIC);
+	if (!vxlan_work)
+		return;
+
+	if (add)
+		INIT_WORK(&vxlan_work->work, mlx5e_vxlan_add_port);
+	else
+		INIT_WORK(&vxlan_work->work, mlx5e_vxlan_del_port);
+
+	vxlan_work->priv = priv;
+	vxlan_work->port = port;
+	vxlan_work->sa_family = sa_family;
+	queue_work(priv->wq, &vxlan_work->work);
 }
 
 void mlx5e_vxlan_cleanup(struct mlx5e_priv *priv)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/vxlan.h b/drivers/net/ethernet/mellanox/mlx5/core/vxlan.h
index a01685056ab1..129f3527aa14 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/vxlan.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/vxlan.h
@@ -39,6 +39,13 @@ struct mlx5e_vxlan {
 	u16 udp_port;
 };
 
+struct mlx5e_vxlan_work {
+	struct work_struct	work;
+	struct mlx5e_priv	*priv;
+	sa_family_t		sa_family;
+	u16			port;
+};
+
 static inline bool mlx5e_vxlan_allowed(struct mlx5_core_dev *mdev)
 {
 	return (MLX5_CAP_ETH(mdev, tunnel_stateless_vxlan) &&
@@ -46,8 +53,8 @@ static inline bool mlx5e_vxlan_allowed(struct mlx5_core_dev *mdev)
 }
 
 void mlx5e_vxlan_init(struct mlx5e_priv *priv);
-int  mlx5e_vxlan_add_port(struct mlx5e_priv *priv, u16 port);
-void mlx5e_vxlan_del_port(struct mlx5e_priv *priv, u16 port);
+void mlx5e_vxlan_queue_work(struct mlx5e_priv *priv, sa_family_t sa_family,
+			    u16 port, int add);
 struct mlx5e_vxlan *mlx5e_vxlan_lookup_port(struct mlx5e_priv *priv, u16 port);
 void mlx5e_vxlan_cleanup(struct mlx5e_priv *priv);