netdev - [net-next V2 11/14] net/mlx5e: TC, refactor access to hash key

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Date: Wed,  7 Jun 2023 14:04:07 -0700
From: Saeed Mahameed <saeed@...nel.org>
To: "David S. Miller" <davem@...emloft.net>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Eric Dumazet <edumazet@...gle.com>
Cc: Saeed Mahameed <saeedm@...dia.com>,
	netdev@...r.kernel.org,
	Tariq Toukan <tariqt@...dia.com>,
	Leon Romanovsky <leonro@...dia.com>,
	linux-rdma@...r.kernel.org,
	Oz Shlomo <ozsh@...dia.com>,
	Paul Blakey <paulb@...dia.com>
Subject: [net-next V2 11/14] net/mlx5e: TC, refactor access to hash key

From: Oz Shlomo <ozsh@...dia.com>

Currently, a temp object is filled and used as a key for rhashtable_lookup.
Lookups will only works while key remains the first attribute in the
relevant rhashtable node object.

Fix this by passing a key, instead of a object containing the key.

Signed-off-by: Oz Shlomo <ozsh@...dia.com>
Reviewed-by: Paul Blakey <paulb@...dia.com>
Signed-off-by: Saeed Mahameed <saeedm@...dia.com>
---
 .../net/ethernet/mellanox/mlx5/core/en/tc/act_stats.c    | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/tc/act_stats.c b/drivers/net/ethernet/mellanox/mlx5/core/en/tc/act_stats.c
index 07c1895a2b23..7aa926e542d3 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en/tc/act_stats.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en/tc/act_stats.c
@@ -25,8 +25,8 @@ struct mlx5e_tc_act_stats {
 
 static const struct rhashtable_params act_counters_ht_params = {
 	.head_offset = offsetof(struct mlx5e_tc_act_stats, hash),
-	.key_offset = 0,
-	.key_len = offsetof(struct mlx5e_tc_act_stats, counter),
+	.key_offset = offsetof(struct mlx5e_tc_act_stats, tc_act_cookie),
+	.key_len = sizeof_field(struct mlx5e_tc_act_stats, tc_act_cookie),
 	.automatic_shrinking = true,
 };
 
@@ -169,14 +169,11 @@ mlx5e_tc_act_stats_fill_stats(struct mlx5e_tc_act_stats_handle *handle,
 {
 	struct rhashtable *ht = &handle->ht;
 	struct mlx5e_tc_act_stats *item;
-	struct mlx5e_tc_act_stats key;
 	u64 pkts, bytes, lastused;
 	int err = 0;
 
-	key.tc_act_cookie = fl_act->cookie;
-
 	rcu_read_lock();
-	item = rhashtable_lookup(ht, &key, act_counters_ht_params);
+	item = rhashtable_lookup(ht, &fl_act->cookie, act_counters_ht_params);
 	if (!item) {
 		rcu_read_unlock();
 		err = -ENOENT;
-- 
2.40.1