net/mlx5: DR, Use variably sized data structures for different actions

mlx5dr_action is a generally used data structure, and there is an
union for different types of actions in it. The size of mlx5dr_action
is about 72 bytes, but for those actions with fewer fields, most of
the allocated memory is wasted.
Remove this union, and mlx5dr_action becomes a generic action header.
Then actions are dynamically allocated with needed memory, the data
for each action is stored right after the header.
Signed-off-by: Jianbo Liu <jianbol@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

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

@@ -572,12 +572,12 @@ int mlx5dr_send_postsend_action(struct mlx5dr_domain *dmn,
 	struct postsend_info send_info = {};
 	int ret;
 
-	send_info.write.addr = (uintptr_t)action->rewrite.data;
-	send_info.write.length = action->rewrite.num_of_actions *
+	send_info.write.addr = (uintptr_t)action->rewrite->data;
+	send_info.write.length = action->rewrite->num_of_actions *
 				 DR_MODIFY_ACTION_SIZE;
 	send_info.write.lkey = 0;
-	send_info.remote_addr = action->rewrite.chunk->mr_addr;
-	send_info.rkey = action->rewrite.chunk->rkey;
+	send_info.remote_addr = action->rewrite->chunk->mr_addr;
+	send_info.rkey = action->rewrite->chunk->rkey;
 
 	ret = dr_postsend_icm_data(dmn, &send_info);
 

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

@@ -29,7 +29,7 @@ int mlx5dr_table_set_miss_action(struct mlx5dr_table *tbl,
 			last_htbl = tbl->rx.s_anchor;
 
 		tbl->rx.default_icm_addr = action ?
-			action->dest_tbl.tbl->rx.s_anchor->chunk->icm_addr :
+			action->dest_tbl->tbl->rx.s_anchor->chunk->icm_addr :
 			tbl->rx.nic_dmn->default_icm_addr;
 
 		info.type = CONNECT_MISS;
@@ -53,7 +53,7 @@ int mlx5dr_table_set_miss_action(struct mlx5dr_table *tbl,
 			last_htbl = tbl->tx.s_anchor;
 
 		tbl->tx.default_icm_addr = action ?
-			action->dest_tbl.tbl->tx.s_anchor->chunk->icm_addr :
+			action->dest_tbl->tbl->tx.s_anchor->chunk->icm_addr :
 			tbl->tx.nic_dmn->default_icm_addr;
 
 		info.type = CONNECT_MISS;

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

@@ -806,11 +806,7 @@ struct mlx5dr_ste_action_modify_field {
 	u8 l4_type;
 };
 
-struct mlx5dr_action {
-	enum mlx5dr_action_type action_type;
-	refcount_t refcount;
-	union {
-		struct {
+struct mlx5dr_action_rewrite {
 	struct mlx5dr_domain *dmn;
 	struct mlx5dr_icm_chunk *chunk;
 	u8 *data;
@@ -819,13 +815,15 @@ struct mlx5dr_action {
 	u8 allow_rx:1;
 	u8 allow_tx:1;
 	u8 modify_ttl:1;
-		} rewrite;
-		struct {
+};
+
+struct mlx5dr_action_reformat {
 	struct mlx5dr_domain *dmn;
 	u32 reformat_id;
 	u32 reformat_size;
-		} reformat;
-		struct {
+};
+
+struct mlx5dr_action_dest_tbl {
 	u8 is_fw_tbl:1;
 	union {
 		struct mlx5dr_table *tbl;
@@ -840,19 +838,39 @@ struct mlx5dr_action {
 			u32 num_of_ref_actions;
 		} fw_tbl;
 	};
-		} dest_tbl;
-		struct {
+};
+
+struct mlx5dr_action_ctr {
 	u32 ctr_id;
 	u32 offeset;
-		} ctr;
-		struct {
+};
+
+struct mlx5dr_action_vport {
 	struct mlx5dr_domain *dmn;
 	struct mlx5dr_cmd_vport_cap *caps;
-		} vport;
-		struct {
+};
+
+struct mlx5dr_action_push_vlan {
 	u32 vlan_hdr; /* tpid_pcp_dei_vid */
-		} push_vlan;
+};
+
+struct mlx5dr_action_flow_tag {
 	u32 flow_tag;
+};
+
+struct mlx5dr_action {
+	enum mlx5dr_action_type action_type;
+	refcount_t refcount;
+
+	union {
+		void *data;
+		struct mlx5dr_action_rewrite *rewrite;
+		struct mlx5dr_action_reformat *reformat;
+		struct mlx5dr_action_dest_tbl *dest_tbl;
+		struct mlx5dr_action_ctr *ctr;
+		struct mlx5dr_action_vport *vport;
+		struct mlx5dr_action_push_vlan *push_vlan;
+		struct mlx5dr_action_flow_tag *flow_tag;
 	};
 };