netdev - [v2 net 14/19] net/mlx5e: TC, Skip redundant ct clear actions

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Message-Id: <20220224001123.365265-15-saeed@kernel.org>
Date:   Wed, 23 Feb 2022 16:11:18 -0800
From:   Saeed Mahameed <saeed@...nel.org>
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org, Roi Dayan <roid@...dia.com>,
        Ariel Levkovich <lariel@...dia.com>,
        Maor Dickman <maord@...dia.com>,
        Saeed Mahameed <saeedm@...dia.com>
Subject: [v2 net 14/19] net/mlx5e: TC, Skip redundant ct clear actions

From: Roi Dayan <roid@...dia.com>

Offload of ct clear action is just resetting the reg_c register.
It's done by allocating modify hdr resources which is limited.
Doing it multiple times is redundant and wasting modify hdr resources
and if resources depleted the driver will fail offloading the rule.
Ignore redundant ct clear actions after the first one.

Fixes: 806401c20a0f ("net/mlx5e: CT, Fix multiple allocations and memleak of mod acts")
Signed-off-by: Roi Dayan <roid@...dia.com>
Reviewed-by: Ariel Levkovich <lariel@...dia.com>
Reviewed-by: Maor Dickman <maord@...dia.com>
Signed-off-by: Saeed Mahameed <saeedm@...dia.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/en/tc/act/act.h | 1 +
 drivers/net/ethernet/mellanox/mlx5/core/en/tc/act/ct.c  | 7 +++++++
 2 files changed, 8 insertions(+)

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 26efa33de56f..10a40487d536 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
@@ -16,6 +16,7 @@ struct mlx5e_tc_act_parse_state {
 	unsigned int num_actions;
 	struct mlx5e_tc_flow *flow;
 	struct netlink_ext_ack *extack;
+	bool ct_clear;
 	bool encap;
 	bool decap;
 	bool mpls_push;
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 06ec30cdb269..58cc33f1363d 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
@@ -27,8 +27,13 @@ tc_act_parse_ct(struct mlx5e_tc_act_parse_state *parse_state,
 		struct mlx5e_priv *priv,
 		struct mlx5_flow_attr *attr)
 {
+	bool clear_action = act->ct.action & TCA_CT_ACT_CLEAR;
 	int err;
 
+	/* It's redundant to do ct clear more than once. */
+	if (clear_action && parse_state->ct_clear)
+		return 0;
+
 	err = mlx5_tc_ct_parse_action(parse_state->ct_priv, attr,
 				      &attr->parse_attr->mod_hdr_acts,
 				      act, parse_state->extack);
@@ -40,6 +45,8 @@ tc_act_parse_ct(struct mlx5e_tc_act_parse_state *parse_state,
 	if (mlx5e_is_eswitch_flow(parse_state->flow))
 		attr->esw_attr->split_count = attr->esw_attr->out_count;
 
+	parse_state->ct_clear = clear_action;
+
 	return 0;
 }
 
-- 
2.35.1