net/mlx5e: Add flow steering debugfs directory

Add a debugfs directory for flow steering related information.
The directory is currently empty, and will hold the 'tc' subdirectory in
a downstream patch.
Signed-off-by: Gal Pressman <gal@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

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

@@ -145,7 +145,8 @@ void mlx5e_destroy_flow_steering(struct mlx5e_flow_steering *fs, bool ntuple,
 
 struct mlx5e_flow_steering *mlx5e_fs_init(const struct mlx5e_profile *profile,
 					  struct mlx5_core_dev *mdev,
-					  bool state_destroy);
+					  bool state_destroy,
+					  struct dentry *dfs_root);
 void mlx5e_fs_cleanup(struct mlx5e_flow_steering *fs);
 struct mlx5e_vlan_table *mlx5e_fs_get_vlan(struct mlx5e_flow_steering *fs);
 void mlx5e_fs_set_tc(struct mlx5e_flow_steering *fs, struct mlx5e_tc_table *tc);
@@ -189,6 +190,8 @@ int mlx5e_fs_vlan_rx_kill_vid(struct mlx5e_flow_steering *fs,
 			      __be16 proto, u16 vid);
 void mlx5e_fs_init_l2_addr(struct mlx5e_flow_steering *fs, struct net_device *netdev);
 
+struct dentry *mlx5e_fs_get_debugfs_root(struct mlx5e_flow_steering *fs);
+
 #define fs_err(fs, fmt, ...) \
 	mlx5_core_err(mlx5e_fs_get_mdev(fs), fmt, ##__VA_ARGS__)
 

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

@@ -30,6 +30,7 @@
  * SOFTWARE.
  */
 
+#include <linux/debugfs.h>
 #include <linux/list.h>
 #include <linux/ip.h>
 #include <linux/ipv6.h>
@@ -67,6 +68,7 @@ struct mlx5e_flow_steering {
 	struct mlx5e_fs_udp            *udp;
 	struct mlx5e_fs_any            *any;
 	struct mlx5e_ptp_fs            *ptp_fs;
+	struct dentry                  *dfs_root;
 };
 
 static int mlx5e_add_l2_flow_rule(struct mlx5e_flow_steering *fs,
@@ -104,6 +106,11 @@ static inline int mlx5e_hash_l2(const u8 *addr)
 	return addr[5];
 }
 
+struct dentry *mlx5e_fs_get_debugfs_root(struct mlx5e_flow_steering *fs)
+{
+	return fs->dfs_root;
+}
+
 static void mlx5e_add_l2_to_hash(struct hlist_head *hash, const u8 *addr)
 {
 	struct mlx5e_l2_hash_node *hn;
@@ -1429,9 +1436,19 @@ static int mlx5e_fs_ethtool_alloc(struct mlx5e_flow_steering *fs)
 static void mlx5e_fs_ethtool_free(struct mlx5e_flow_steering *fs) { }
 #endif
 
+static void mlx5e_fs_debugfs_init(struct mlx5e_flow_steering *fs,
+				  struct dentry *dfs_root)
+{
+	if (IS_ERR_OR_NULL(dfs_root))
+		return;
+
+	fs->dfs_root = debugfs_create_dir("fs", dfs_root);
+}
+
 struct mlx5e_flow_steering *mlx5e_fs_init(const struct mlx5e_profile *profile,
 					  struct mlx5_core_dev *mdev,
-					  bool state_destroy)
+					  bool state_destroy,
+					  struct dentry *dfs_root)
 {
 	struct mlx5e_flow_steering *fs;
 	int err;
@@ -1458,6 +1475,8 @@ struct mlx5e_flow_steering *mlx5e_fs_init(const struct mlx5e_profile *profile,
 	if (err)
 		goto err_free_tc;
 
+	mlx5e_fs_debugfs_init(fs, dfs_root);
+
 	return fs;
 err_free_tc:
 	mlx5e_fs_tc_free(fs);
@@ -1471,6 +1490,7 @@ struct mlx5e_flow_steering *mlx5e_fs_init(const struct mlx5e_profile *profile,
 
 void mlx5e_fs_cleanup(struct mlx5e_flow_steering *fs)
 {
+	debugfs_remove_recursive(fs->dfs_root);
 	mlx5e_fs_ethtool_free(fs);
 	mlx5e_fs_tc_free(fs);
 	mlx5e_fs_vlan_free(fs);

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

@@ -5231,7 +5231,8 @@ static int mlx5e_nic_init(struct mlx5_core_dev *mdev,
 	mlx5e_timestamp_init(priv);
 
 	fs = mlx5e_fs_init(priv->profile, mdev,
-			   !test_bit(MLX5E_STATE_DESTROYING, &priv->state));
+			   !test_bit(MLX5E_STATE_DESTROYING, &priv->state),
+			   priv->dfs_root);
 	if (!fs) {
 		err = -ENOMEM;
 		mlx5_core_err(mdev, "FS initialization failed, %d\n", err);

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

@@ -788,8 +788,10 @@ static int mlx5e_init_rep(struct mlx5_core_dev *mdev,
 {
 	struct mlx5e_priv *priv = netdev_priv(netdev);
 
-	priv->fs = mlx5e_fs_init(priv->profile, mdev,
-				 !test_bit(MLX5E_STATE_DESTROYING, &priv->state));
+	priv->fs =
+		mlx5e_fs_init(priv->profile, mdev,
+			      !test_bit(MLX5E_STATE_DESTROYING, &priv->state),
+			      priv->dfs_root);
 	if (!priv->fs) {
 		netdev_err(priv->netdev, "FS allocation failed\n");
 		return -ENOMEM;
@@ -807,7 +809,8 @@ static int mlx5e_init_ul_rep(struct mlx5_core_dev *mdev,
 	struct mlx5e_priv *priv = netdev_priv(netdev);
 
 	priv->fs = mlx5e_fs_init(priv->profile, mdev,
-				 !test_bit(MLX5E_STATE_DESTROYING, &priv->state));
+				 !test_bit(MLX5E_STATE_DESTROYING, &priv->state),
+				 priv->dfs_root);
 	if (!priv->fs) {
 		netdev_err(priv->netdev, "FS allocation failed\n");
 		return -ENOMEM;

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

@@ -374,7 +374,8 @@ static int mlx5i_init_rx(struct mlx5e_priv *priv)
 	int err;
 
 	priv->fs = mlx5e_fs_init(priv->profile, mdev,
-				 !test_bit(MLX5E_STATE_DESTROYING, &priv->state));
+				 !test_bit(MLX5E_STATE_DESTROYING, &priv->state),
+				 priv->dfs_root);
 	if (!priv->fs) {
 		netdev_err(priv->netdev, "FS allocation failed\n");
 		return -ENOMEM;