net/mlx5: Implement RoCE LAG feature

Available on dual port cards only, this feature keeps
track, using netdev LAG events, of the bonding
and link status of each port's PF netdev.

When both of the card's PF netdevs are enslaved to the
same bond/team master, and only them, LAG state
is active.

During LAG, only one IB device is present for both ports.

In addition to the above, this commit includes FW commands
used for managing the LAG, new facilities for adding and removing
a single device by interface, and port remap functionality according to
bond events.

Please note that this feature is currently used only for mimicking
Ethernet bonding for RoCE - netdevs functionality is not altered,
and their bonding continues to be managed solely by bond/team driver.

Signed-off-by: Aviv Heller <avivh@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>

1 files changed, 38 insertions, 13 deletions

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/main.c b/drivers/net/ethernet/mellanox/mlx5/core/main.c
index d6446a3623b2..db7bcfcef3da 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/main.c
@@ -73,8 +73,9 @@ module_param_named(prof_sel, prof_sel, int, 0444);
 MODULE_PARM_DESC(prof_sel, "profile selector. Valid range 0 - 2");
 
 static LIST_HEAD(intf_list);
-static LIST_HEAD(dev_list);
-static DEFINE_MUTEX(intf_mutex);
+
+LIST_HEAD(mlx5_dev_list);
+DEFINE_MUTEX(mlx5_intf_mutex);
 
 struct mlx5_device_context {
 	struct list_head	list;
@@ -820,11 +821,11 @@ static int mlx5_register_device(struct mlx5_core_dev *dev)
 	struct mlx5_priv *priv = &dev->priv;
 	struct mlx5_interface *intf;
 
-	mutex_lock(&intf_mutex);
-	list_add_tail(&priv->dev_list, &dev_list);
+	mutex_lock(&mlx5_intf_mutex);
+	list_add_tail(&priv->dev_list, &mlx5_dev_list);
 	list_for_each_entry(intf, &intf_list, list)
 		mlx5_add_device(intf, priv);
-	mutex_unlock(&intf_mutex);
+	mutex_unlock(&mlx5_intf_mutex);
 
 	return 0;
 }
@@ -834,11 +835,11 @@ static void mlx5_unregister_device(struct mlx5_core_dev *dev)
 	struct mlx5_priv *priv = &dev->priv;
 	struct mlx5_interface *intf;
 
-	mutex_lock(&intf_mutex);
+	mutex_lock(&mlx5_intf_mutex);
 	list_for_each_entry(intf, &intf_list, list)
 		mlx5_remove_device(intf, priv);
 	list_del(&priv->dev_list);
-	mutex_unlock(&intf_mutex);
+	mutex_unlock(&mlx5_intf_mutex);
 }
 
 int mlx5_register_interface(struct mlx5_interface *intf)
@@ -848,11 +849,11 @@ int mlx5_register_interface(struct mlx5_interface *intf)
 	if (!intf->add || !intf->remove)
 		return -EINVAL;
 
-	mutex_lock(&intf_mutex);
+	mutex_lock(&mlx5_intf_mutex);
 	list_add_tail(&intf->list, &intf_list);
-	list_for_each_entry(priv, &dev_list, dev_list)
+	list_for_each_entry(priv, &mlx5_dev_list, dev_list)
 		mlx5_add_device(intf, priv);
-	mutex_unlock(&intf_mutex);
+	mutex_unlock(&mlx5_intf_mutex);
 
 	return 0;
 }
@@ -862,11 +863,11 @@ void mlx5_unregister_interface(struct mlx5_interface *intf)
 {
 	struct mlx5_priv *priv;
 
-	mutex_lock(&intf_mutex);
-	list_for_each_entry(priv, &dev_list, dev_list)
+	mutex_lock(&mlx5_intf_mutex);
+	list_for_each_entry(priv, &mlx5_dev_list, dev_list)
 		mlx5_remove_device(intf, priv);
 	list_del(&intf->list);
-	mutex_unlock(&intf_mutex);
+	mutex_unlock(&mlx5_intf_mutex);
 }
 EXPORT_SYMBOL(mlx5_unregister_interface);
 
@@ -892,6 +893,30 @@ void *mlx5_get_protocol_dev(struct mlx5_core_dev *mdev, int protocol)
 }
 EXPORT_SYMBOL(mlx5_get_protocol_dev);
 
+/* Must be called with intf_mutex held */
+void mlx5_add_dev_by_protocol(struct mlx5_core_dev *dev, int protocol)
+{
+	struct mlx5_interface *intf;
+
+	list_for_each_entry(intf, &intf_list, list)
+		if (intf->protocol == protocol) {
+			mlx5_add_device(intf, &dev->priv);
+			break;
+		}
+}
+
+/* Must be called with intf_mutex held */
+void mlx5_remove_dev_by_protocol(struct mlx5_core_dev *dev, int protocol)
+{
+	struct mlx5_interface *intf;
+
+	list_for_each_entry(intf, &intf_list, list)
+		if (intf->protocol == protocol) {
+			mlx5_remove_device(intf, &dev->priv);
+			break;
+		}
+}
+
 static int mlx5_pci_init(struct mlx5_core_dev *dev, struct mlx5_priv *priv)
 {
 	struct pci_dev *pdev = dev->pdev;