net/mlx5e: Support configurable MTU for vport representors

The representor MTU was hard coded to 1500 bytes.
Allow setting arbitrary MTU values up to the max supported by the FW.

Signed-off-by: Adi Nissim <adin@mellanox.com>
Reviewed-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

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

@@ -1102,6 +1102,10 @@ void mlx5e_update_stats_work(struct work_struct *work);
 
 int mlx5e_bits_invert(unsigned long a, int size);
 
+typedef int (*change_hw_mtu_cb)(struct mlx5e_priv *priv);
+int mlx5e_change_mtu(struct net_device *netdev, int new_mtu,
+		     change_hw_mtu_cb set_mtu_cb);
+
 /* ethtool helpers */
 void mlx5e_ethtool_get_drvinfo(struct mlx5e_priv *priv,
 			       struct ethtool_drvinfo *drvinfo);

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

@@ -3495,7 +3495,8 @@ static netdev_features_t mlx5e_fix_features(struct net_device *netdev,
 	return features;
 }
 
-static int mlx5e_change_mtu(struct net_device *netdev, int new_mtu)
+int mlx5e_change_mtu(struct net_device *netdev, int new_mtu,
+		     change_hw_mtu_cb set_mtu_cb)
 {
 	struct mlx5e_priv *priv = netdev_priv(netdev);
 	struct mlx5e_channels new_channels = {};
@@ -3522,7 +3523,7 @@ static int mlx5e_change_mtu(struct net_device *netdev, int new_mtu)
 
 	if (!reset) {
 		params->sw_mtu = new_mtu;
-		mlx5e_set_dev_port_mtu(priv);
+		set_mtu_cb(priv);
 		netdev->mtu = params->sw_mtu;
 		goto out;
 	}
@@ -3531,14 +3532,19 @@ static int mlx5e_change_mtu(struct net_device *netdev, int new_mtu)
 	if (err)
 		goto out;
 
-	mlx5e_switch_priv_channels(priv, &new_channels, mlx5e_set_dev_port_mtu);
+	mlx5e_switch_priv_channels(priv, &new_channels, set_mtu_cb);
 	netdev->mtu = new_channels.params.sw_mtu;
 
 out:
 	mutex_unlock(&priv->state_lock);
 	return err;
 }
 
+static int mlx5e_change_nic_mtu(struct net_device *netdev, int new_mtu)
+{
+	return mlx5e_change_mtu(netdev, new_mtu, mlx5e_set_dev_port_mtu);
+}
+
 int mlx5e_hwstamp_set(struct mlx5e_priv *priv, struct ifreq *ifr)
 {
 	struct hwtstamp_config config;
@@ -4033,7 +4039,7 @@ static const struct net_device_ops mlx5e_netdev_ops = {
 	.ndo_vlan_rx_kill_vid    = mlx5e_vlan_rx_kill_vid,
 	.ndo_set_features        = mlx5e_set_features,
 	.ndo_fix_features        = mlx5e_fix_features,
-	.ndo_change_mtu          = mlx5e_change_mtu,
+	.ndo_change_mtu          = mlx5e_change_nic_mtu,
 	.ndo_do_ioctl            = mlx5e_ioctl,
 	.ndo_set_tx_maxrate      = mlx5e_set_tx_maxrate,
 	.ndo_udp_tunnel_add      = mlx5e_add_vxlan_port,

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

@@ -900,6 +900,11 @@ static const struct switchdev_ops mlx5e_rep_switchdev_ops = {
 	.switchdev_port_attr_get	= mlx5e_attr_get,
 };
 
+int mlx5e_change_rep_mtu(struct net_device *netdev, int new_mtu)
+{
+	return mlx5e_change_mtu(netdev, new_mtu, NULL);
+}
+
 static const struct net_device_ops mlx5e_netdev_ops_rep = {
 	.ndo_open                = mlx5e_rep_open,
 	.ndo_stop                = mlx5e_rep_close,
@@ -909,6 +914,7 @@ static const struct net_device_ops mlx5e_netdev_ops_rep = {
 	.ndo_get_stats64         = mlx5e_rep_get_stats,
 	.ndo_has_offload_stats	 = mlx5e_has_offload_stats,
 	.ndo_get_offload_stats	 = mlx5e_get_offload_stats,
+	.ndo_change_mtu          = mlx5e_change_rep_mtu,
 };
 
 static void mlx5e_build_rep_params(struct mlx5_core_dev *mdev,
@@ -935,6 +941,10 @@ static void mlx5e_build_rep_params(struct mlx5_core_dev *mdev,
 
 static void mlx5e_build_rep_netdev(struct net_device *netdev)
 {
+	struct mlx5e_priv *priv = netdev_priv(netdev);
+	struct mlx5_core_dev *mdev = priv->mdev;
+	u16 max_mtu;
+
 	netdev->netdev_ops = &mlx5e_netdev_ops_rep;
 
 	netdev->watchdog_timeo    = 15 * HZ;
@@ -947,6 +957,10 @@ static void mlx5e_build_rep_netdev(struct net_device *netdev)
 	netdev->hw_features      |= NETIF_F_HW_TC;
 
 	eth_hw_addr_random(netdev);
+
+	netdev->min_mtu = ETH_MIN_MTU;
+	mlx5_query_port_max_mtu(mdev, &max_mtu, 1);
+	netdev->max_mtu = MLX5E_HW2SW_MTU(&priv->channels.params, max_mtu);
 }
 
 static void mlx5e_init_rep(struct mlx5_core_dev *mdev,