[PATCH 24/30] net/mlx5/hws: dynamic re-parse for modify header

[Gregory Etelson <getelson@nvidia.com>]

From: Alex Vesker <valex@nvidia.com>

With dynamic re-parse we would always require re-parse but
this is not always necessary. Re-parse is only needed when
the packet structure is changed. This support will allow
dynamically deciding based on the action pattern if re-parse
is required or no.

Signed-off-by: Alex Vesker <valex@nvidia.com>
Reviewed-by: Erez Shitrit <erezsh@nvidia.com>
Acked-by: Matan Azrad <matan@nvidia.com>
---
 drivers/net/mlx5/hws/mlx5dr_action.c  | 15 +++++++---
 drivers/net/mlx5/hws/mlx5dr_action.h  |  1 +
 drivers/net/mlx5/hws/mlx5dr_pat_arg.c | 41 +++++++++++++++++++++++++--
 drivers/net/mlx5/hws/mlx5dr_pat_arg.h |  2 ++
 4 files changed, 53 insertions(+), 6 deletions(-)

diff --git a/drivers/net/mlx5/hws/mlx5dr_action.c b/drivers/net/mlx5/hws/mlx5dr_action.c
index bdccfb9cf3..59be8ae2c5 100644
--- a/drivers/net/mlx5/hws/mlx5dr_action.c
+++ b/drivers/net/mlx5/hws/mlx5dr_action.c
@@ -635,7 +635,9 @@ static void mlx5dr_action_fill_stc_attr(struct mlx5dr_action *action,
 	case MLX5DR_ACTION_TYP_REFORMAT_TNL_L3_TO_L2:
 	case MLX5DR_ACTION_TYP_MODIFY_HDR:
 		attr->action_offset = MLX5DR_ACTION_OFFSET_DW6;
-		attr->reparse_mode = MLX5_IFC_STC_REPARSE_ALWAYS;
+		if (action->modify_header.require_reparse)
+			attr->reparse_mode = MLX5_IFC_STC_REPARSE_ALWAYS;
+
 		if (action->modify_header.num_of_actions == 1) {
 			attr->modify_action.data = action->modify_header.single_action;
 			attr->action_type = mlx5dr_action_get_mh_stc_type(attr->modify_action.data);
@@ -1614,6 +1616,8 @@ mlx5dr_action_handle_tunnel_l3_to_l2(struct mlx5dr_action *action,
 		action[i].modify_header.num_of_actions = num_of_actions;
 		action[i].modify_header.arg_obj = arg_obj;
 		action[i].modify_header.pat_obj = pat_obj;
+		action[i].modify_header.require_reparse =
+			mlx5dr_pat_require_reparse((__be64 *)mh_data, num_of_actions);
 
 		ret = mlx5dr_action_create_stcs(&action[i], NULL);
 		if (ret) {
@@ -1760,7 +1764,7 @@ mlx5dr_action_create_modify_header_hws(struct mlx5dr_action *action,
 {
 	struct mlx5dr_devx_obj *pat_obj, *arg_obj = NULL;
 	struct mlx5dr_context *ctx = action->ctx;
-	uint16_t max_mh_actions = 0;
+	uint16_t num_actions, max_mh_actions = 0;
 	int i, ret;
 
 	/* Calculate maximum number of mh actions for shared arg allocation */
@@ -1786,11 +1790,14 @@ mlx5dr_action_create_modify_header_hws(struct mlx5dr_action *action,
 			goto free_stc_and_pat;
 		}
 
+		num_actions = pattern[i].sz / MLX5DR_MODIFY_ACTION_SIZE;
 		action[i].modify_header.num_of_patterns = num_of_patterns;
 		action[i].modify_header.max_num_of_actions = max_mh_actions;
-		action[i].modify_header.num_of_actions = pattern[i].sz / MLX5DR_MODIFY_ACTION_SIZE;
+		action[i].modify_header.num_of_actions = num_actions;
+		action[i].modify_header.require_reparse =
+			mlx5dr_pat_require_reparse(pattern[i].data, num_actions);
 
-		if (action[i].modify_header.num_of_actions == 1) {
+		if (num_actions == 1) {
 			pat_obj = NULL;
 			/* Optimize single modify action to be used inline */
 			action[i].modify_header.single_action = pattern[i].data[0];
diff --git a/drivers/net/mlx5/hws/mlx5dr_action.h b/drivers/net/mlx5/hws/mlx5dr_action.h
index 328de65a1e..e56f5b59c7 100644
--- a/drivers/net/mlx5/hws/mlx5dr_action.h
+++ b/drivers/net/mlx5/hws/mlx5dr_action.h
@@ -132,6 +132,7 @@ struct mlx5dr_action {
 					uint8_t single_action_type;
 					uint8_t num_of_actions;
 					uint8_t max_num_of_actions;
+					uint8_t require_reparse;
 				} modify_header;
 				struct {
 					struct mlx5dr_devx_obj *arg_obj;
diff --git a/drivers/net/mlx5/hws/mlx5dr_pat_arg.c b/drivers/net/mlx5/hws/mlx5dr_pat_arg.c
index 349d77f296..a949844d24 100644
--- a/drivers/net/mlx5/hws/mlx5dr_pat_arg.c
+++ b/drivers/net/mlx5/hws/mlx5dr_pat_arg.c
@@ -37,6 +37,43 @@ uint32_t mlx5dr_arg_get_arg_size(uint16_t num_of_actions)
 	return BIT(mlx5dr_arg_get_arg_log_size(num_of_actions));
 }
 
+bool mlx5dr_pat_require_reparse(__be64 *actions, uint16_t num_of_actions)
+{
+	uint16_t i, field;
+	uint8_t action_id;
+
+	for (i = 0; i < num_of_actions; i++) {
+		action_id = MLX5_GET(set_action_in, &actions[i], action_type);
+
+		switch (action_id) {
+		case MLX5_MODIFICATION_TYPE_NOP:
+			field = MLX5_MODI_OUT_NONE;
+			break;
+
+		case MLX5_MODIFICATION_TYPE_SET:
+		case MLX5_MODIFICATION_TYPE_ADD:
+			field = MLX5_GET(set_action_in, &actions[i], field);
+			break;
+
+		case MLX5_MODIFICATION_TYPE_COPY:
+		case MLX5_MODIFICATION_TYPE_ADD_FIELD:
+			field = MLX5_GET(copy_action_in, &actions[i], dst_field);
+			break;
+
+		default:
+			/* Insert/Remove/Unknown actions require reparse */
+			return true;
+		}
+
+		/* Below fields can change packet structure require a reparse */
+		if (field == MLX5_MODI_OUT_ETHERTYPE ||
+		    field == MLX5_MODI_OUT_IPV6_NEXT_HDR)
+			return true;
+	}
+
+	return false;
+}
+
 /* Cache and cache element handling */
 int mlx5dr_pat_init_pattern_cache(struct mlx5dr_pattern_cache **cache)
 {
@@ -228,8 +265,8 @@ mlx5dr_pat_get_pattern(struct mlx5dr_context *ctx,
 	}
 
 	pat_obj = mlx5dr_cmd_header_modify_pattern_create(ctx->ibv_ctx,
-							      pattern_sz,
-							      (uint8_t *)pattern);
+							  pattern_sz,
+							  (uint8_t *)pattern);
 	if (!pat_obj) {
 		DR_LOG(ERR, "Failed to create pattern FW object");
 		goto out_unlock;
diff --git a/drivers/net/mlx5/hws/mlx5dr_pat_arg.h b/drivers/net/mlx5/hws/mlx5dr_pat_arg.h
index 2a38891c4d..bbe313102f 100644
--- a/drivers/net/mlx5/hws/mlx5dr_pat_arg.h
+++ b/drivers/net/mlx5/hws/mlx5dr_pat_arg.h
@@ -79,6 +79,8 @@ void mlx5dr_pat_put_pattern(struct mlx5dr_context *ctx,
 bool mlx5dr_arg_is_valid_arg_request_size(struct mlx5dr_context *ctx,
 					  uint32_t arg_size);
 
+bool mlx5dr_pat_require_reparse(__be64 *actions, uint16_t num_of_actions);
+
 void mlx5dr_arg_write(struct mlx5dr_send_engine *queue,
 		      void *comp_data,
 		      uint32_t arg_idx,
-- 
2.39.2