net/mlx5: fs, add HWS to steering mode options

Add HW Steering mode to mlx5 devlink param of steering mode options.

Signed-off-by: Moshe Shemesh <[email protected]>
Reviewed-by: Yevgeny Kliteynik <[email protected]>
Reviewed-by: Mark Bloch <[email protected]>
Signed-off-by: Tariq Toukan <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

Author: mosheshemesh2

Documentation/networking/devlink/mlx5.rst

@@ -53,6 +53,9 @@ parameters.
        * ``smfs`` Software managed flow steering. In SMFS mode, the HW
          steering entities are created and manage through the driver without
          firmware intervention.
+       * ``hmfs`` Hardware managed flow steering. In HMFS mode, the driver
+         is configuring steering rules directly to the HW using Work Queues with
+         a special new type of WQE (Work Queue Element).
 
        SMFS mode is faster and provides better rule insertion rate compared to
        default DMFS mode.

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

@@ -3535,35 +3535,42 @@ static int mlx5_fs_mode_validate(struct devlink *devlink, u32 id,
 {
 	struct mlx5_core_dev *dev = devlink_priv(devlink);
 	char *value = val.vstr;
-	int err = 0;
+	u8 eswitch_mode;
 
-	if (!strcmp(value, "dmfs")) {
+	if (!strcmp(value, "dmfs"))
 		return 0;
-	} else if (!strcmp(value, "smfs")) {
-		u8 eswitch_mode;
-		bool smfs_cap;
 
-		eswitch_mode = mlx5_eswitch_mode(dev);
-		smfs_cap = mlx5_fs_dr_is_supported(dev);
+	if (!strcmp(value, "smfs")) {
+		bool smfs_cap = mlx5_fs_dr_is_supported(dev);
 
 		if (!smfs_cap) {
-			err = -EOPNOTSUPP;
 			NL_SET_ERR_MSG_MOD(extack,
 					   "Software managed steering is not supported by current device");
+			return -EOPNOTSUPP;
 		}
+	} else if (!strcmp(value, "hmfs")) {
+		bool hmfs_cap = mlx5_fs_hws_is_supported(dev);
 
-		else if (eswitch_mode == MLX5_ESWITCH_OFFLOADS) {
+		if (!hmfs_cap) {
 			NL_SET_ERR_MSG_MOD(extack,
-					   "Software managed steering is not supported when eswitch offloads enabled.");
-			err = -EOPNOTSUPP;
+					   "Hardware steering is not supported by current device");
+			return -EOPNOTSUPP;
 		}
 	} else {
 		NL_SET_ERR_MSG_MOD(extack,
-				   "Bad parameter: supported values are [\"dmfs\", \"smfs\"]");
-		err = -EINVAL;
+				   "Bad parameter: supported values are [\"dmfs\", \"smfs\", \"hmfs\"]");
+		return -EINVAL;
 	}
 
-	return err;
+	eswitch_mode = mlx5_eswitch_mode(dev);
+	if (eswitch_mode == MLX5_ESWITCH_OFFLOADS) {
+		NL_SET_ERR_MSG_FMT_MOD(extack,
+				       "Moving to %s is not supported when eswitch offloads enabled.",
+				       value);
+		return -EOPNOTSUPP;
+	}
+
+	return 0;
 }
 
 static int mlx5_fs_mode_set(struct devlink *devlink, u32 id,
@@ -3575,6 +3582,8 @@ static int mlx5_fs_mode_set(struct devlink *devlink, u32 id,
 
 	if (!strcmp(ctx->val.vstr, "smfs"))
 		mode = MLX5_FLOW_STEERING_MODE_SMFS;
+	else if (!strcmp(ctx->val.vstr, "hmfs"))
+		mode = MLX5_FLOW_STEERING_MODE_HMFS;
 	else
 		mode = MLX5_FLOW_STEERING_MODE_DMFS;
 	dev->priv.steering->mode = mode;
@@ -3587,10 +3596,17 @@ static int mlx5_fs_mode_get(struct devlink *devlink, u32 id,
 {
 	struct mlx5_core_dev *dev = devlink_priv(devlink);
 
-	if (dev->priv.steering->mode == MLX5_FLOW_STEERING_MODE_SMFS)
+	switch (dev->priv.steering->mode) {
+	case MLX5_FLOW_STEERING_MODE_SMFS:
 		strscpy(ctx->val.vstr, "smfs", sizeof(ctx->val.vstr));
-	else
+		break;
+	case MLX5_FLOW_STEERING_MODE_HMFS:
+		strscpy(ctx->val.vstr, "hmfs", sizeof(ctx->val.vstr));
+		break;
+	default:
 		strscpy(ctx->val.vstr, "dmfs", sizeof(ctx->val.vstr));
+	}
+
 	return 0;
 }
 
@@ -4009,6 +4025,8 @@ int mlx5_flow_namespace_set_mode(struct mlx5_flow_namespace *ns,
 
 	if (mode == MLX5_FLOW_STEERING_MODE_SMFS)
 		cmds = mlx5_fs_cmd_get_dr_cmds();
+	else if (mode == MLX5_FLOW_STEERING_MODE_HMFS)
+		cmds = mlx5_fs_cmd_get_hws_cmds();
 	else
 		cmds = mlx5_fs_cmd_get_fw_cmds();
 	if (!cmds)

drivers/net/ethernet/mellanox/mlx5/core/steering/hws/fs_hws.c

@@ -1344,6 +1344,11 @@ static u32 mlx5_cmd_hws_get_capabilities(struct mlx5_flow_root_namespace *ns,
 	       MLX5_FLOW_STEERING_CAP_MATCH_RANGES;
 }
 
+bool mlx5_fs_hws_is_supported(struct mlx5_core_dev *dev)
+{
+	return mlx5hws_is_supported(dev);
+}
+
 static const struct mlx5_flow_cmds mlx5_flow_cmds_hws = {
 	.create_flow_table = mlx5_cmd_hws_create_flow_table,
 	.destroy_flow_table = mlx5_cmd_hws_destroy_flow_table,

drivers/net/ethernet/mellanox/mlx5/core/steering/hws/fs_hws.h

@@ -60,10 +60,17 @@ struct mlx5_fs_hws_rule {
 
 #ifdef CONFIG_MLX5_HW_STEERING
 
+bool mlx5_fs_hws_is_supported(struct mlx5_core_dev *dev);
+
 const struct mlx5_flow_cmds *mlx5_fs_cmd_get_hws_cmds(void);
 
 #else
 
+static inline bool mlx5_fs_hws_is_supported(struct mlx5_core_dev *dev)
+{
+	return false;
+}
+
 static inline const struct mlx5_flow_cmds *mlx5_fs_cmd_get_hws_cmds(void)
 {
 	return NULL;