1 files changed, 35 insertions, 79 deletions

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/vxlan.c b/drivers/net/ethernet/mellanox/mlx5/core/lib/vxlan.c
index 82c766a95165..3315afe2f8dc 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/lib/vxlan.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/vxlan.c
@@ -40,24 +40,16 @@
 
 struct mlx5_vxlan {
 	struct mlx5_core_dev		*mdev;
-	spinlock_t			lock; /* protect vxlan table */
 	/* max_num_ports is usuallly 4, 16 buckets is more than enough */
 	DECLARE_HASHTABLE(htable, 4);
-	int				num_ports;
 	struct mutex                    sync_lock; /* sync add/del port HW operations */
 };
 
 struct mlx5_vxlan_port {
 	struct hlist_node hlist;
-	refcount_t refcount;
 	u16 udp_port;
 };
 
-static inline u8 mlx5_vxlan_max_udp_ports(struct mlx5_core_dev *mdev)
-{
-	return MLX5_CAP_ETH(mdev, max_vxlan_udp_ports) ?: 4;
-}
-
 static int mlx5_vxlan_core_add_port_cmd(struct mlx5_core_dev *mdev, u16 port)
 {
 	u32 in[MLX5_ST_SZ_DW(add_vxlan_udp_dport_in)] = {};
@@ -78,113 +70,78 @@ static int mlx5_vxlan_core_del_port_cmd(struct mlx5_core_dev *mdev, u16 port)
 	return mlx5_cmd_exec_in(mdev, delete_vxlan_udp_dport, in);
 }
 
-static struct mlx5_vxlan_port*
-mlx5_vxlan_lookup_port_locked(struct mlx5_vxlan *vxlan, u16 port)
+bool mlx5_vxlan_lookup_port(struct mlx5_vxlan *vxlan, u16 port)
 {
 	struct mlx5_vxlan_port *vxlanp;
+	bool found = false;
 
-	hash_for_each_possible(vxlan->htable, vxlanp, hlist, port) {
-		if (vxlanp->udp_port == port)
-			return vxlanp;
-	}
+	if (!mlx5_vxlan_allowed(vxlan))
+		return NULL;
 
-	return NULL;
+	rcu_read_lock();
+	hash_for_each_possible_rcu(vxlan->htable, vxlanp, hlist, port)
+		if (vxlanp->udp_port == port) {
+			found = true;
+			break;
+		}
+	rcu_read_unlock();
+
+	return found;
 }
 
-struct mlx5_vxlan_port *mlx5_vxlan_lookup_port(struct mlx5_vxlan *vxlan, u16 port)
+static struct mlx5_vxlan_port *vxlan_lookup_port(struct mlx5_vxlan *vxlan, u16 port)
 {
 	struct mlx5_vxlan_port *vxlanp;
 
-	if (!mlx5_vxlan_allowed(vxlan))
-		return NULL;
-
-	spin_lock_bh(&vxlan->lock);
-	vxlanp = mlx5_vxlan_lookup_port_locked(vxlan, port);
-	spin_unlock_bh(&vxlan->lock);
-
-	return vxlanp;
+	hash_for_each_possible(vxlan->htable, vxlanp, hlist, port)
+		if (vxlanp->udp_port == port)
+			return vxlanp;
+	return NULL;
 }
 
 int mlx5_vxlan_add_port(struct mlx5_vxlan *vxlan, u16 port)
 {
 	struct mlx5_vxlan_port *vxlanp;
-	int ret = -ENOSPC;
-
-	vxlanp = mlx5_vxlan_lookup_port(vxlan, port);
-	if (vxlanp) {
-		refcount_inc(&vxlanp->refcount);
-		return 0;
-	}
-
-	mutex_lock(&vxlan->sync_lock);
-	if (vxlan->num_ports >= mlx5_vxlan_max_udp_ports(vxlan->mdev)) {
-		mlx5_core_info(vxlan->mdev,
-			       "UDP port (%d) not offloaded, max number of UDP ports (%d) are already offloaded\n",
-			       port, mlx5_vxlan_max_udp_ports(vxlan->mdev));
-		ret = -ENOSPC;
-		goto unlock;
-	}
-
-	ret = mlx5_vxlan_core_add_port_cmd(vxlan->mdev, port);
-	if (ret)
-		goto unlock;
+	int ret;
 
 	vxlanp = kzalloc(sizeof(*vxlanp), GFP_KERNEL);
-	if (!vxlanp) {
-		ret = -ENOMEM;
-		goto err_delete_port;
-	}
-
+	if (!vxlanp)
+		return -ENOMEM;
 	vxlanp->udp_port = port;
-	refcount_set(&vxlanp->refcount, 1);
 
-	spin_lock_bh(&vxlan->lock);
-	hash_add(vxlan->htable, &vxlanp->hlist, port);
-	spin_unlock_bh(&vxlan->lock);
+	ret = mlx5_vxlan_core_add_port_cmd(vxlan->mdev, port);
+	if (ret) {
+		kfree(vxlanp);
+		return ret;
+	}
 
-	vxlan->num_ports++;
+	mutex_lock(&vxlan->sync_lock);
+	hash_add_rcu(vxlan->htable, &vxlanp->hlist, port);
 	mutex_unlock(&vxlan->sync_lock);
-	return 0;
-
-err_delete_port:
-	mlx5_vxlan_core_del_port_cmd(vxlan->mdev, port);
 
-unlock:
-	mutex_unlock(&vxlan->sync_lock);
-	return ret;
+	return 0;
 }
 
 int mlx5_vxlan_del_port(struct mlx5_vxlan *vxlan, u16 port)
 {
 	struct mlx5_vxlan_port *vxlanp;
-	bool remove = false;
 	int ret = 0;
 
 	mutex_lock(&vxlan->sync_lock);
 
-	spin_lock_bh(&vxlan->lock);
-	vxlanp = mlx5_vxlan_lookup_port_locked(vxlan, port);
-	if (!vxlanp) {
+	vxlanp = vxlan_lookup_port(vxlan, port);
+	if (WARN_ON(!vxlanp)) {
 		ret = -ENOENT;
 		goto out_unlock;
 	}
 
-	if (refcount_dec_and_test(&vxlanp->refcount)) {
-		hash_del(&vxlanp->hlist);
-		remove = true;
-	}
+	hash_del_rcu(&vxlanp->hlist);
+	synchronize_rcu();
+	mlx5_vxlan_core_del_port_cmd(vxlan->mdev, port);
+	kfree(vxlanp);
 
 out_unlock:
-	spin_unlock_bh(&vxlan->lock);
-
-	if (remove) {
-		mlx5_vxlan_core_del_port_cmd(vxlan->mdev, port);
-		kfree(vxlanp);
-		vxlan->num_ports--;
-	}
-
 	mutex_unlock(&vxlan->sync_lock);
-
 	return ret;
 }
 
@@ -201,7 +158,6 @@ struct mlx5_vxlan *mlx5_vxlan_create(struct mlx5_core_dev *mdev)
 
 	vxlan->mdev = mdev;
 	mutex_init(&vxlan->sync_lock);
-	spin_lock_init(&vxlan->lock);
 	hash_init(vxlan->htable);
 
 	/* Hardware adds 4789 (IANA_VXLAN_UDP_PORT) by default */