net/mlx5: DR, Support SW created encap actions for FW table

In some cases, steering might need to use SW-created action in
FW table, which results in wrong packet reformat being used:

  mlx5_core 0000:81:00.1: mlx5_cmd_check:756:(pid 1154):
      SET_FLOW_TABLE_ENTRY(0×936) op_mod(0×0) failed,
      status bad resource(0×5), syndrome (0xf2ff71)

This patch adds support for usage of SW-created packet reformat (encap)
actions in FW tables, and adds clear error flow for attempt to use
SW-created modify header on FW tables.

Fixes: 6a48fae ("net/mlx5: Add direct rule fs_cmd implementation")
Signed-off-by: Yevgeny Kliteynik <kliteyn@nvidia.com>
Reviewed-by: Erez Shitrit <erezsh@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

Author: kliteyn

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

@@ -511,10 +511,11 @@ static int mlx5_cmd_set_fte(struct mlx5_core_dev *dev,
 	struct mlx5_flow_rule *dst;
 	void *in_flow_context, *vlan;
 	void *in_match_value;
+	int reformat_id = 0;
 	unsigned int inlen;
 	int dst_cnt_size;
+	u32 *in, action;
 	void *in_dests;
-	u32 *in;
 	int err;
 
 	if (mlx5_set_extended_dest(dev, fte, &extended_dest))
@@ -553,22 +554,42 @@ static int mlx5_cmd_set_fte(struct mlx5_core_dev *dev,
 
 	MLX5_SET(flow_context, in_flow_context, extended_destination,
 		 extended_dest);
-	if (extended_dest) {
-		u32 action;
 
-		action = fte->action.action &
-			~MLX5_FLOW_CONTEXT_ACTION_PACKET_REFORMAT;
-		MLX5_SET(flow_context, in_flow_context, action, action);
-	} else {
-		MLX5_SET(flow_context, in_flow_context, action,
-			 fte->action.action);
-		if (fte->action.pkt_reformat)
-			MLX5_SET(flow_context, in_flow_context, packet_reformat_id,
-				 fte->action.pkt_reformat->id);
+	action = fte->action.action;
+	if (extended_dest)
+		action &= ~MLX5_FLOW_CONTEXT_ACTION_PACKET_REFORMAT;
+
+	MLX5_SET(flow_context, in_flow_context, action, action);
+
+	if (!extended_dest && fte->action.pkt_reformat) {
+		struct mlx5_pkt_reformat *pkt_reformat = fte->action.pkt_reformat;
+
+		if (pkt_reformat->owner == MLX5_FLOW_RESOURCE_OWNER_SW) {
+			reformat_id = mlx5_fs_dr_action_get_pkt_reformat_id(pkt_reformat);
+			if (reformat_id < 0) {
+				mlx5_core_err(dev,
+					      "Unsupported SW-owned pkt_reformat type (%d) in FW-owned table\n",
+					      pkt_reformat->reformat_type);
+				err = reformat_id;
+				goto err_out;
+			}
+		} else {
+			reformat_id = fte->action.pkt_reformat->id;
+		}
 	}
-	if (fte->action.modify_hdr)
+
+	MLX5_SET(flow_context, in_flow_context, packet_reformat_id, (u32)reformat_id);
+
+	if (fte->action.modify_hdr) {
+		if (fte->action.modify_hdr->owner == MLX5_FLOW_RESOURCE_OWNER_SW) {
+			mlx5_core_err(dev, "Can't use SW-owned modify_hdr in FW-owned table\n");
+			err = -EOPNOTSUPP;
+			goto err_out;
+		}
+
 		MLX5_SET(flow_context, in_flow_context, modify_header_id,
 			 fte->action.modify_hdr->id);
+	}
 
 	MLX5_SET(flow_context, in_flow_context, encrypt_decrypt_type,
 		 fte->action.crypto.type);
@@ -885,6 +906,8 @@ static int mlx5_cmd_packet_reformat_alloc(struct mlx5_flow_root_namespace *ns,
 
 	pkt_reformat->id = MLX5_GET(alloc_packet_reformat_context_out,
 				    out, packet_reformat_id);
+	pkt_reformat->owner = MLX5_FLOW_RESOURCE_OWNER_FW;
+
 	kfree(in);
 	return err;
 }
@@ -969,6 +992,7 @@ static int mlx5_cmd_modify_header_alloc(struct mlx5_flow_root_namespace *ns,
 	err = mlx5_cmd_exec(dev, in, inlen, out, sizeof(out));
 
 	modify_hdr->id = MLX5_GET(alloc_modify_header_context_out, out, modify_header_id);
+	modify_hdr->owner = MLX5_FLOW_RESOURCE_OWNER_FW;
 	kfree(in);
 	return err;
 }

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

@@ -54,8 +54,14 @@ struct mlx5_flow_definer {
 	u32 id;
 };
 
+enum mlx5_flow_resource_owner {
+	MLX5_FLOW_RESOURCE_OWNER_FW,
+	MLX5_FLOW_RESOURCE_OWNER_SW,
+};
+
 struct mlx5_modify_hdr {
 	enum mlx5_flow_namespace_type ns_type;
+	enum mlx5_flow_resource_owner owner;
 	union {
 		struct mlx5_fs_dr_action action;
 		u32 id;
@@ -65,6 +71,7 @@ struct mlx5_modify_hdr {
 struct mlx5_pkt_reformat {
 	enum mlx5_flow_namespace_type ns_type;
 	int reformat_type; /* from mlx5_ifc */
+	enum mlx5_flow_resource_owner owner;
 	union {
 		struct mlx5_fs_dr_action action;
 		u32 id;

drivers/net/ethernet/mellanox/mlx5/core/steering/dr_action.c

@@ -2129,6 +2129,11 @@ mlx5dr_action_create_aso(struct mlx5dr_domain *dmn, u32 obj_id,
 	return action;
 }
 
+u32 mlx5dr_action_get_pkt_reformat_id(struct mlx5dr_action *action)
+{
+	return action->reformat->id;
+}
+
 int mlx5dr_action_destroy(struct mlx5dr_action *action)
 {
 	if (WARN_ON_ONCE(refcount_read(&action->refcount) > 1))

drivers/net/ethernet/mellanox/mlx5/core/steering/fs_dr.c

@@ -331,8 +331,16 @@ static int mlx5_cmd_dr_create_fte(struct mlx5_flow_root_namespace *ns,
 	}
 
 	if (fte->action.action & MLX5_FLOW_CONTEXT_ACTION_PACKET_REFORMAT) {
-		bool is_decap = fte->action.pkt_reformat->reformat_type ==
-			MLX5_REFORMAT_TYPE_L3_TUNNEL_TO_L2;
+		bool is_decap;
+
+		if (fte->action.pkt_reformat->owner == MLX5_FLOW_RESOURCE_OWNER_FW) {
+			err = -EINVAL;
+			mlx5dr_err(domain, "FW-owned reformat can't be used in SW rule\n");
+				goto free_actions;
+		}
+
+		is_decap = fte->action.pkt_reformat->reformat_type ==
+			   MLX5_REFORMAT_TYPE_L3_TUNNEL_TO_L2;
 
 		if (is_decap)
 			actions[num_actions++] =
@@ -661,6 +669,7 @@ static int mlx5_cmd_dr_packet_reformat_alloc(struct mlx5_flow_root_namespace *ns
 		return -EINVAL;
 	}
 
+	pkt_reformat->owner = MLX5_FLOW_RESOURCE_OWNER_SW;
 	pkt_reformat->action.dr_action = action;
 
 	return 0;
@@ -691,6 +700,7 @@ static int mlx5_cmd_dr_modify_header_alloc(struct mlx5_flow_root_namespace *ns,
 		return -EINVAL;
 	}
 
+	modify_hdr->owner = MLX5_FLOW_RESOURCE_OWNER_SW;
 	modify_hdr->action.dr_action = action;
 
 	return 0;
@@ -816,6 +826,19 @@ static u32 mlx5_cmd_dr_get_capabilities(struct mlx5_flow_root_namespace *ns,
 	return steering_caps;
 }
 
+int mlx5_fs_dr_action_get_pkt_reformat_id(struct mlx5_pkt_reformat *pkt_reformat)
+{
+	switch (pkt_reformat->reformat_type) {
+	case MLX5_REFORMAT_TYPE_L2_TO_VXLAN:
+	case MLX5_REFORMAT_TYPE_L2_TO_NVGRE:
+	case MLX5_REFORMAT_TYPE_L2_TO_L2_TUNNEL:
+	case MLX5_REFORMAT_TYPE_L2_TO_L3_TUNNEL:
+	case MLX5_REFORMAT_TYPE_INSERT_HDR:
+		return mlx5dr_action_get_pkt_reformat_id(pkt_reformat->action.dr_action);
+	}
+	return -EOPNOTSUPP;
+}
+
 bool mlx5_fs_dr_is_supported(struct mlx5_core_dev *dev)
 {
 	return mlx5dr_is_supported(dev);

drivers/net/ethernet/mellanox/mlx5/core/steering/fs_dr.h

@@ -38,6 +38,8 @@ struct mlx5_fs_dr_table {
 
 bool mlx5_fs_dr_is_supported(struct mlx5_core_dev *dev);
 
+int mlx5_fs_dr_action_get_pkt_reformat_id(struct mlx5_pkt_reformat *pkt_reformat);
+
 const struct mlx5_flow_cmds *mlx5_fs_cmd_get_dr_cmds(void);
 
 #else
@@ -47,6 +49,11 @@ static inline const struct mlx5_flow_cmds *mlx5_fs_cmd_get_dr_cmds(void)
 	return NULL;
 }
 
+static inline u32 mlx5_fs_dr_action_get_pkt_reformat_id(struct mlx5_pkt_reformat *pkt_reformat)
+{
+	return 0;
+}
+
 static inline bool mlx5_fs_dr_is_supported(struct mlx5_core_dev *dev)
 {
 	return false;

drivers/net/ethernet/mellanox/mlx5/core/steering/mlx5dr.h

@@ -150,6 +150,8 @@ mlx5dr_action_create_dest_match_range(struct mlx5dr_domain *dmn,
 
 int mlx5dr_action_destroy(struct mlx5dr_action *action);
 
+u32 mlx5dr_action_get_pkt_reformat_id(struct mlx5dr_action *action);
+
 int mlx5dr_definer_get(struct mlx5dr_domain *dmn, u16 format_id,
 		       u8 *dw_selectors, u8 *byte_selectors,
 		       u8 *match_mask, u32 *definer_id);