net/mlx5e: Do not reload ethernet ports when changing eswitch mode

When switching modes between legacy and switchdev and back, do not
reload ethernet interfaces. just change the profile from nic profile
to uplink rep profile in switchdev mode.

Signed-off-by: Roi Dayan <roid@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

Author: roidayan

drivers/net/ethernet/mellanox/mlx5/core/dev.c

@@ -58,9 +58,6 @@ static bool is_eth_supported(struct mlx5_core_dev *dev)
 	if (!IS_ENABLED(CONFIG_MLX5_CORE_EN))
 		return false;
 
-	if (is_eth_rep_supported(dev))
-		return false;
-
 	if (MLX5_CAP_GEN(dev, port_type) != MLX5_CAP_PORT_TYPE_ETH)
 		return false;
 

drivers/net/ethernet/mellanox/mlx5/core/en.h

@@ -1173,6 +1173,7 @@ void mlx5e_detach_netdev(struct mlx5e_priv *priv);
 void mlx5e_destroy_netdev(struct mlx5e_priv *priv);
 int mlx5e_netdev_change_profile(struct mlx5e_priv *priv,
 				const struct mlx5e_profile *new_profile, void *new_ppriv);
+void mlx5e_netdev_attach_nic_profile(struct mlx5e_priv *priv);
 void mlx5e_set_netdev_mtu_boundaries(struct mlx5e_priv *priv);
 void mlx5e_build_nic_params(struct mlx5e_priv *priv, struct mlx5e_xsk *xsk, u16 mtu);
 void mlx5e_build_rq_params(struct mlx5_core_dev *mdev,

drivers/net/ethernet/mellanox/mlx5/core/en/reporter_rx.c

@@ -635,4 +635,5 @@ void mlx5e_reporter_rx_destroy(struct mlx5e_priv *priv)
 		return;
 
 	devlink_port_health_reporter_destroy(priv->rx_reporter);
+	priv->rx_reporter = NULL;
 }

drivers/net/ethernet/mellanox/mlx5/core/en/reporter_tx.c

@@ -593,4 +593,5 @@ void mlx5e_reporter_tx_destroy(struct mlx5e_priv *priv)
 		return;
 
 	devlink_port_health_reporter_destroy(priv->tx_reporter);
+	priv->tx_reporter = NULL;
 }

drivers/net/ethernet/mellanox/mlx5/core/en_main.c

@@ -5742,6 +5742,11 @@ int mlx5e_netdev_change_profile(struct mlx5e_priv *priv,
 	return err;
 }
 
+void mlx5e_netdev_attach_nic_profile(struct mlx5e_priv *priv)
+{
+	mlx5e_netdev_change_profile(priv, &mlx5e_nic_profile, NULL);
+}
+
 void mlx5e_destroy_netdev(struct mlx5e_priv *priv)
 {
 	struct net_device *netdev = priv->netdev;
@@ -5852,6 +5857,7 @@ static int mlx5e_probe(struct auxiliary_device *adev,
 	mlx5e_devlink_port_type_eth_set(priv);
 
 	mlx5e_dcbnl_init_app(priv);
+	mlx5_uplink_netdev_set(mdev, netdev);
 	return 0;
 
 err_resume:

drivers/net/ethernet/mellanox/mlx5/core/en_rep.c

@@ -44,6 +44,7 @@
 #include "en_tc.h"
 #include "en/rep/tc.h"
 #include "en/rep/neigh.h"
+#include "en/devlink.h"
 #include "fs_core.h"
 #include "lib/mlx5.h"
 #define CREATE_TRACE_POINTS
@@ -588,26 +589,15 @@ static void mlx5e_build_rep_params(struct net_device *netdev)
 }
 
 static void mlx5e_build_rep_netdev(struct net_device *netdev,
-				   struct mlx5_core_dev *mdev,
-				   struct mlx5_eswitch_rep *rep)
+				   struct mlx5_core_dev *mdev)
 {
 	SET_NETDEV_DEV(netdev, mdev->device);
-	if (rep->vport == MLX5_VPORT_UPLINK) {
-		netdev->netdev_ops = &mlx5e_netdev_ops;
-		/* we want a persistent mac for the uplink rep */
-		mlx5_query_mac_address(mdev, netdev->dev_addr);
-		netdev->ethtool_ops = &mlx5e_ethtool_ops;
-		mlx5e_dcbnl_build_rep_netdev(netdev);
-	} else {
-		netdev->netdev_ops = &mlx5e_netdev_ops_rep;
-		eth_hw_addr_random(netdev);
-		netdev->ethtool_ops = &mlx5e_rep_ethtool_ops;
-	}
+	netdev->netdev_ops = &mlx5e_netdev_ops_rep;
+	eth_hw_addr_random(netdev);
+	netdev->ethtool_ops = &mlx5e_rep_ethtool_ops;
 
 	netdev->watchdog_timeo    = 15 * HZ;
 
-	netdev->features       |= NETIF_F_NETNS_LOCAL;
-
 #if IS_ENABLED(CONFIG_MLX5_CLS_ACT)
 	netdev->hw_features    |= NETIF_F_HW_TC;
 #endif
@@ -619,12 +609,9 @@ static void mlx5e_build_rep_netdev(struct net_device *netdev,
 	netdev->hw_features    |= NETIF_F_TSO6;
 	netdev->hw_features    |= NETIF_F_RXCSUM;
 
-	if (rep->vport == MLX5_VPORT_UPLINK)
-		netdev->hw_features |= NETIF_F_HW_VLAN_CTAG_RX;
-	else
-		netdev->features |= NETIF_F_VLAN_CHALLENGED;
-
 	netdev->features |= netdev->hw_features;
+	netdev->features |= NETIF_F_VLAN_CHALLENGED;
+	netdev->features |= NETIF_F_NETNS_LOCAL;
 }
 
 static int mlx5e_init_rep(struct mlx5_core_dev *mdev,
@@ -990,13 +977,27 @@ static void mlx5e_uplink_rep_enable(struct mlx5e_priv *priv)
 	mlx5e_dcbnl_initialize(priv);
 	mlx5e_dcbnl_init_app(priv);
 	mlx5e_rep_neigh_init(rpriv);
+
+	netdev->wanted_features |= NETIF_F_HW_TC;
+
+	rtnl_lock();
+	if (netif_running(netdev))
+		mlx5e_open(netdev);
+	netif_device_attach(netdev);
+	rtnl_unlock();
 }
 
 static void mlx5e_uplink_rep_disable(struct mlx5e_priv *priv)
 {
 	struct mlx5e_rep_priv *rpriv = priv->ppriv;
 	struct mlx5_core_dev *mdev = priv->mdev;
 
+	rtnl_lock();
+	if (netif_running(priv->netdev))
+		mlx5e_close(priv->netdev);
+	netif_device_detach(priv->netdev);
+	rtnl_unlock();
+
 	mlx5e_rep_neigh_cleanup(rpriv);
 	mlx5e_dcbnl_delete_app(priv);
 	mlx5_notifier_unregister(mdev, &priv->events_nb);
@@ -1081,26 +1082,56 @@ static const struct mlx5e_profile mlx5e_uplink_rep_profile = {
 
 /* e-Switch vport representors */
 static int
-mlx5e_vport_rep_load(struct mlx5_core_dev *dev, struct mlx5_eswitch_rep *rep)
+mlx5e_vport_uplink_rep_load(struct mlx5_core_dev *dev, struct mlx5_eswitch_rep *rep)
+{
+	struct mlx5e_priv *priv = netdev_priv(mlx5_uplink_netdev_get(dev));
+	struct mlx5e_rep_priv *rpriv = mlx5e_rep_to_rep_priv(rep);
+	struct devlink_port *dl_port;
+	int err;
+
+	rpriv->netdev = priv->netdev;
+
+	err = mlx5e_netdev_change_profile(priv, &mlx5e_uplink_rep_profile,
+					  rpriv);
+	if (err)
+		return err;
+
+	dl_port = mlx5_esw_offloads_devlink_port(dev->priv.eswitch, rpriv->rep->vport);
+	if (dl_port)
+		devlink_port_type_eth_set(dl_port, rpriv->netdev);
+
+	return 0;
+}
+
+static void
+mlx5e_vport_uplink_rep_unload(struct mlx5e_rep_priv *rpriv)
+{
+	struct net_device *netdev = rpriv->netdev;
+	struct devlink_port *dl_port;
+	struct mlx5_core_dev *dev;
+	struct mlx5e_priv *priv;
+
+	priv = netdev_priv(netdev);
+	dev = priv->mdev;
+
+	dl_port = mlx5_esw_offloads_devlink_port(dev->priv.eswitch, rpriv->rep->vport);
+	if (dl_port)
+		devlink_port_type_clear(dl_port);
+	mlx5e_netdev_attach_nic_profile(priv);
+}
+
+static int
+mlx5e_vport_vf_rep_load(struct mlx5_core_dev *dev, struct mlx5_eswitch_rep *rep)
 {
+	struct mlx5e_rep_priv *rpriv = mlx5e_rep_to_rep_priv(rep);
 	const struct mlx5e_profile *profile;
-	struct mlx5e_rep_priv *rpriv;
 	struct devlink_port *dl_port;
 	struct net_device *netdev;
 	struct mlx5e_priv *priv;
 	unsigned int txqs, rxqs;
 	int nch, err;
 
-	rpriv = kzalloc(sizeof(*rpriv), GFP_KERNEL);
-	if (!rpriv)
-		return -ENOMEM;
-
-	/* rpriv->rep to be looked up when profile->init() is called */
-	rpriv->rep = rep;
-
-	profile = (rep->vport == MLX5_VPORT_UPLINK) ?
-		  &mlx5e_uplink_rep_profile : &mlx5e_rep_profile;
-
+	profile = &mlx5e_rep_profile;
 	nch = mlx5e_get_max_num_channels(dev);
 	txqs = nch * profile->max_tc;
 	rxqs = nch * profile->rq_groups;
@@ -1109,29 +1140,19 @@ mlx5e_vport_rep_load(struct mlx5_core_dev *dev, struct mlx5_eswitch_rep *rep)
 		mlx5_core_warn(dev,
 			       "Failed to create representor netdev for vport %d\n",
 			       rep->vport);
-		kfree(rpriv);
 		return -EINVAL;
 	}
 
-	mlx5e_build_rep_netdev(netdev, dev, rep);
-
+	mlx5e_build_rep_netdev(netdev, dev);
 	rpriv->netdev = netdev;
-	rep->rep_data[REP_ETH].priv = rpriv;
-	INIT_LIST_HEAD(&rpriv->vport_sqs_list);
-
-	if (rep->vport == MLX5_VPORT_UPLINK) {
-		err = mlx5e_create_mdev_resources(dev);
-		if (err)
-			goto err_destroy_netdev;
-	}
 
 	priv = netdev_priv(netdev);
 	priv->profile = profile;
 	priv->ppriv = rpriv;
 	err = profile->init(dev, netdev);
 	if (err) {
 		netdev_warn(netdev, "rep profile init failed, %d\n", err);
-		goto err_destroy_mdev_resources;
+		goto err_destroy_netdev;
 	}
 
 	err = mlx5e_attach_netdev(netdev_priv(netdev));
@@ -1161,13 +1182,34 @@ mlx5e_vport_rep_load(struct mlx5_core_dev *dev, struct mlx5_eswitch_rep *rep)
 err_cleanup_profile:
 	priv->profile->cleanup(priv);
 
-err_destroy_mdev_resources:
-	if (rep->vport == MLX5_VPORT_UPLINK)
-		mlx5e_destroy_mdev_resources(dev);
-
 err_destroy_netdev:
 	mlx5e_destroy_netdev(netdev_priv(netdev));
-	kfree(rpriv);
+	return err;
+}
+
+static int
+mlx5e_vport_rep_load(struct mlx5_core_dev *dev, struct mlx5_eswitch_rep *rep)
+{
+	struct mlx5e_rep_priv *rpriv;
+	int err;
+
+	rpriv = kzalloc(sizeof(*rpriv), GFP_KERNEL);
+	if (!rpriv)
+		return -ENOMEM;
+
+	/* rpriv->rep to be looked up when profile->init() is called */
+	rpriv->rep = rep;
+	rep->rep_data[REP_ETH].priv = rpriv;
+	INIT_LIST_HEAD(&rpriv->vport_sqs_list);
+
+	if (rep->vport == MLX5_VPORT_UPLINK)
+		err = mlx5e_vport_uplink_rep_load(dev, rep);
+	else
+		err = mlx5e_vport_vf_rep_load(dev, rep);
+
+	if (err)
+		kfree(rpriv);
+
 	return err;
 }
 
@@ -1181,15 +1223,19 @@ mlx5e_vport_rep_unload(struct mlx5_eswitch_rep *rep)
 	struct devlink_port *dl_port;
 	void *ppriv = priv->ppriv;
 
+	if (rep->vport == MLX5_VPORT_UPLINK) {
+		mlx5e_vport_uplink_rep_unload(rpriv);
+		goto free_ppriv;
+	}
+
 	dl_port = mlx5_esw_offloads_devlink_port(dev->priv.eswitch, rpriv->rep->vport);
 	if (dl_port)
 		devlink_port_type_clear(dl_port);
 	unregister_netdev(netdev);
 	mlx5e_detach_netdev(priv);
 	priv->profile->cleanup(priv);
-	if (rep->vport == MLX5_VPORT_UPLINK)
-		mlx5e_destroy_mdev_resources(priv->mdev);
 	mlx5e_destroy_netdev(priv);
+free_ppriv:
 	kfree(ppriv); /* mlx5e_rep_priv */
 }
 

drivers/net/ethernet/mellanox/mlx5/core/lib/mlx5.h

@@ -95,4 +95,13 @@ static inline struct net *mlx5_core_net(struct mlx5_core_dev *dev)
 	return devlink_net(priv_to_devlink(dev));
 }
 
+static inline void mlx5_uplink_netdev_set(struct mlx5_core_dev *mdev, struct net_device *netdev)
+{
+	mdev->mlx5e_res.uplink_netdev = netdev;
+}
+
+static inline struct net_device *mlx5_uplink_netdev_get(struct mlx5_core_dev *mdev)
+{
+	return mdev->mlx5e_res.uplink_netdev;
+}
 #endif

include/linux/mlx5/driver.h

@@ -651,6 +651,7 @@ struct mlx5e_resources {
 		struct mlx5_sq_bfreg       bfreg;
 	} hw_objs;
 	struct devlink_port dl_port;
+	struct net_device *uplink_netdev;
 };
 
 enum mlx5_sw_icm_type {