eth: mlx5: expose NETIF_F_NTUPLE when ARFS is compiled out

ARFS depends on NTUPLE filters, but the inverse is not true.
Drivers which don't support ARFS commonly still support NTUPLE
filtering. mlx5 has a Kconfig option to disable ARFS (MLX5_EN_ARFS)
and does not advertise NTUPLE filters as a feature at all when ARFS
is compiled out. That's not correct, ntuple filters indeed still work
just fine (as long as MLX5_EN_RXNFC is enabled).

This is needed to make the RSS test not skip all RSS context
related testing.

Acked-by: Saeed Mahameed <saeedm@nvidia.com>
Link: https://patch.msgid.link/20240711223722.297676-1-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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

@@ -154,6 +154,19 @@ struct mlx5e_tc_table *mlx5e_fs_get_tc(struct mlx5e_flow_steering *fs);
 struct mlx5e_l2_table *mlx5e_fs_get_l2(struct mlx5e_flow_steering *fs);
 struct mlx5_flow_namespace *mlx5e_fs_get_ns(struct mlx5e_flow_steering *fs, bool egress);
 void mlx5e_fs_set_ns(struct mlx5e_flow_steering *fs, struct mlx5_flow_namespace *ns, bool egress);
+
+static inline bool mlx5e_fs_has_arfs(struct net_device *netdev)
+{
+	return IS_ENABLED(CONFIG_MLX5_EN_ARFS) &&
+		netdev->hw_features & NETIF_F_NTUPLE;
+}
+
+static inline bool mlx5e_fs_want_arfs(struct net_device *netdev)
+{
+	return IS_ENABLED(CONFIG_MLX5_EN_ARFS) &&
+		netdev->features & NETIF_F_NTUPLE;
+}
+
 #ifdef CONFIG_MLX5_EN_RXNFC
 struct mlx5e_ethtool_steering *mlx5e_fs_get_ethtool(struct mlx5e_flow_steering *fs);
 #endif

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

@@ -525,7 +525,7 @@ int mlx5e_ethtool_set_channels(struct mlx5e_priv *priv,
 
 	opened = test_bit(MLX5E_STATE_OPENED, &priv->state);
 
-	arfs_enabled = opened && (priv->netdev->features & NETIF_F_NTUPLE);
+	arfs_enabled = opened && mlx5e_fs_want_arfs(priv->netdev);
 	if (arfs_enabled)
 		mlx5e_arfs_disable(priv->fs);
 

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

@@ -1307,8 +1307,7 @@ int mlx5e_create_flow_steering(struct mlx5e_flow_steering *fs,
 		return -EOPNOTSUPP;
 
 	mlx5e_fs_set_ns(fs, ns, false);
-	err = mlx5e_arfs_create_tables(fs, rx_res,
-				       !!(netdev->hw_features & NETIF_F_NTUPLE));
+	err = mlx5e_arfs_create_tables(fs, rx_res, mlx5e_fs_has_arfs(netdev));
 	if (err) {
 		fs_err(fs, "Failed to create arfs tables, err=%d\n", err);
 		netdev->hw_features &= ~NETIF_F_NTUPLE;
@@ -1355,7 +1354,7 @@ int mlx5e_create_flow_steering(struct mlx5e_flow_steering *fs,
 err_destroy_inner_ttc_table:
 	mlx5e_destroy_inner_ttc_table(fs);
 err_destroy_arfs_tables:
-	mlx5e_arfs_destroy_tables(fs, !!(netdev->hw_features & NETIF_F_NTUPLE));
+	mlx5e_arfs_destroy_tables(fs, mlx5e_fs_has_arfs(netdev));
 
 	return err;
 }

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

@@ -5556,8 +5556,10 @@ static void mlx5e_build_nic_netdev(struct net_device *netdev)
 #if IS_ENABLED(CONFIG_MLX5_CLS_ACT)
 		netdev->hw_features      |= NETIF_F_HW_TC;
 #endif
-#ifdef CONFIG_MLX5_EN_ARFS
+#if IS_ENABLED(CONFIG_MLX5_EN_ARFS)
 		netdev->hw_features	 |= NETIF_F_NTUPLE;
+#elif IS_ENABLED(CONFIG_MLX5_EN_RXNFC)
+		netdev->features	 |= NETIF_F_NTUPLE;
 #endif
 	}
 
@@ -5731,7 +5733,7 @@ static int mlx5e_init_nic_rx(struct mlx5e_priv *priv)
 err_tc_nic_cleanup:
 	mlx5e_tc_nic_cleanup(priv);
 err_destroy_flow_steering:
-	mlx5e_destroy_flow_steering(priv->fs, !!(priv->netdev->hw_features & NETIF_F_NTUPLE),
+	mlx5e_destroy_flow_steering(priv->fs, mlx5e_fs_has_arfs(priv->netdev),
 				    priv->profile);
 err_destroy_rx_res:
 	mlx5e_rx_res_destroy(priv->rx_res);
@@ -5747,7 +5749,7 @@ static void mlx5e_cleanup_nic_rx(struct mlx5e_priv *priv)
 {
 	mlx5e_accel_cleanup_rx(priv);
 	mlx5e_tc_nic_cleanup(priv);
-	mlx5e_destroy_flow_steering(priv->fs, !!(priv->netdev->hw_features & NETIF_F_NTUPLE),
+	mlx5e_destroy_flow_steering(priv->fs, mlx5e_fs_has_arfs(priv->netdev),
 				    priv->profile);
 	mlx5e_rx_res_destroy(priv->rx_res);
 	priv->rx_res = NULL;

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

@@ -372,7 +372,7 @@ static int mlx5i_create_flow_steering(struct mlx5e_priv *priv)
 
 	mlx5e_fs_set_ns(priv->fs, ns, false);
 	err = mlx5e_arfs_create_tables(priv->fs, priv->rx_res,
-				       !!(priv->netdev->hw_features & NETIF_F_NTUPLE));
+				       mlx5e_fs_has_arfs(priv->netdev));
 	if (err) {
 		netdev_err(priv->netdev, "Failed to create arfs tables, err=%d\n",
 			   err);
@@ -391,17 +391,15 @@ static int mlx5i_create_flow_steering(struct mlx5e_priv *priv)
 	return 0;
 
 err_destroy_arfs_tables:
-	mlx5e_arfs_destroy_tables(priv->fs,
-				  !!(priv->netdev->hw_features & NETIF_F_NTUPLE));
+	mlx5e_arfs_destroy_tables(priv->fs, mlx5e_fs_has_arfs(priv->netdev));
 
 	return err;
 }
 
 static void mlx5i_destroy_flow_steering(struct mlx5e_priv *priv)
 {
 	mlx5e_destroy_ttc_table(priv->fs);
-	mlx5e_arfs_destroy_tables(priv->fs,
-				  !!(priv->netdev->hw_features & NETIF_F_NTUPLE));
+	mlx5e_arfs_destroy_tables(priv->fs, mlx5e_fs_has_arfs(priv->netdev));
 	mlx5e_ethtool_cleanup_steering(priv->fs);
 }