Subject: [net-next 04/15] net/mlx5e: CT: Use per action stats

From: Saeed Mahameed <[email-masked]>
Date: Wed, 5 Apr 2023 19:02:21 -0700

From: Paul Blakey <[email-masked]>

CT action can miss in a middle of an action list, use
per action stats to correctly report stats for missed
packets.

Signed-off-by: Paul Blakey <[email-masked]>
Reviewed-by: Roi Dayan <[email-masked]>
Signed-off-by: Saeed Mahameed <[email-masked]>
---
 .../mellanox/mlx5/core/en/tc/act/act.h        |  2 ++
 .../mellanox/mlx5/core/en/tc/act/ct.c         |  9 ++++++++-
 .../net/ethernet/mellanox/mlx5/core/en_tc.c   | 19 +++++++++++++++++--
 3 files changed, 27 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/tc/act/act.h b/drivers/net/ethernet/mellanox/mlx5/core/en/tc/act/act.h
index 8346557eeaf6..cdcddf6e1b08 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/tc/act/act.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/tc/act/act.h
@@ -56,6 +56,8 @@ struct mlx5e_tc_act {
 				   const struct flow_action_entry *act,
 				   struct mlx5_flow_attr *attr);
 
+	bool (*is_missable)(const struct flow_action_entry *act);
+
 	int (*offload_action)(struct mlx5e_priv *priv,
 			      struct flow_offload_action *fl_act,
 			      struct flow_action_entry *act);
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/tc/act/ct.c b/drivers/net/ethernet/mellanox/mlx5/core/en/tc/act/ct.c
index a829c94289c1..fce1c0fd2453 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/tc/act/ct.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/tc/act/ct.c
@@ -95,10 +95,17 @@ tc_act_is_multi_table_act_ct(struct mlx5e_priv *priv,
 	return true;
 }
 
+static bool
+tc_act_is_missable_ct(const struct flow_action_entry *act)
+{
+	return !(act->ct.action & TCA_CT_ACT_CLEAR);
+}
+
 struct mlx5e_tc_act mlx5e_tc_act_ct = {
 	.can_offload = tc_act_can_offload_ct,
 	.parse_action = tc_act_parse_ct,
-	.is_multi_table_act = tc_act_is_multi_table_act_ct,
 	.post_parse = tc_act_post_parse_ct,
+	.is_multi_table_act = tc_act_is_multi_table_act_ct,
+	.is_missable = tc_act_is_missable_ct,
 };
 
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
index cafab7634fb8..32b50d685312 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
@@ -4052,7 +4052,9 @@ parse_tc_actions(struct mlx5e_tc_act_parse_state *parse_state,
 	enum mlx5_flow_namespace_type ns_type;
 	struct mlx5e_priv *priv = flow->priv;
 	struct flow_action_entry *act, **_act;
+	struct mlx5_flow_attr *prev_attr;
 	struct mlx5e_tc_act *tc_act;
+	bool is_missable;
 	int err, i;
 
 	flow_action_reorder.num_entries = flow_action->num_entries;
@@ -4069,6 +4071,9 @@ parse_tc_actions(struct mlx5e_tc_act_parse_state *parse_state,
 	flow_action_for_each(i, _act, &flow_action_reorder) {
 		jump_state.jump_target = false;
 		act = *_act;
+		is_missable = false;
+		prev_attr = attr;
+
 		tc_act = mlx5e_tc_act_get(act->id, ns_type);
 		if (!tc_act) {
 			NL_SET_ERR_MSG_MOD(extack, "Not implemented offload action");
@@ -4092,14 +4097,14 @@ parse_tc_actions(struct mlx5e_tc_act_parse_state *parse_state,
 			goto out_free;
 
 		parse_state->actions |= attr->action;
-		if (!tc_act->stats_action)
-			attr->tc_act_cookies[attr->tc_act_cookies_count++] = act->cookie;
 
 		/* Split attr for multi table act if not the last act. */
 		if (jump_state.jump_target ||
 		    (tc_act->is_multi_table_act &&
 		    tc_act->is_multi_table_act(priv, act, attr) &&
 		    i < flow_action_reorder.num_entries - 1)) {
+			is_missable = tc_act->is_missable ? tc_act->is_missable(act) : false;
+
 			err = mlx5e_tc_act_post_parse(parse_state, flow_action, attr, ns_type);
 			if (err)
 				goto out_free;
@@ -4112,6 +4117,16 @@ parse_tc_actions(struct mlx5e_tc_act_parse_state *parse_state,
 
 			list_add(&attr->list, &flow->attrs);
 		}
+
+		if (is_missable) {
+			/* Add counter to prev, and assign act to new (next) attr */
+			prev_attr->action |= MLX5_FLOW_CONTEXT_ACTION_COUNT;
+			flow_flag_set(flow, USE_ACT_STATS);
+
+			attr->tc_act_cookies[attr->tc_act_cookies_count++] = act->cookie;
+		} else if (!tc_act->stats_action) {
+			prev_attr->tc_act_cookies[prev_attr->tc_act_cookies_count++] = act->cookie;
+		}
 	}
 
 	kfree(flow_action_reorder.entries);
-- 
2.39.2