linux-kernel - [PATCH net] net: sfc: Correct key_len for efx_tc_ct_zone_ht

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Message-Id: <20241230093709.3226854-1-buaajxlj@163.com>
Date: Mon, 30 Dec 2024 17:37:09 +0800
From: Liang Jie <buaajxlj@....com>
To: kuba@...nel.org,
	ecree.xilinx@...il.com
Cc: habetsm.xilinx@...il.com,
	andrew+netdev@...n.ch,
	davem@...emloft.net,
	edumazet@...gle.com,
	pabeni@...hat.com,
	horms@...nel.org,
	pieter.jansen-van-vuuren@....com,
	netdev@...r.kernel.org,
	linux-net-drivers@....com,
	linux-kernel@...r.kernel.org,
	Liang Jie <liangjie@...iang.com>
Subject: [PATCH net] net: sfc: Correct key_len for efx_tc_ct_zone_ht_params

From: Liang Jie <liangjie@...iang.com>

In efx_tc_ct_zone_ht_params, the key_len was previously set to
offsetof(struct efx_tc_ct_zone, linkage). This calculation is incorrect
because it includes any padding between the zone field and the linkage
field due to structure alignment, which can vary between systems.

This patch updates key_len to use sizeof_field(struct efx_tc_ct_zone, zone)
, ensuring that the hash table correctly uses the zone as the key. This fix
prevents potential hash lookup errors and improves connection tracking
reliability.

Fixes: c3bb5c6acd4e ("sfc: functions to register for conntrack zone offload")
Signed-off-by: Liang Jie <liangjie@...iang.com>
---
 drivers/net/ethernet/sfc/tc_conntrack.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/sfc/tc_conntrack.c b/drivers/net/ethernet/sfc/tc_conntrack.c
index d90206f27161..c0603f54cec3 100644
--- a/drivers/net/ethernet/sfc/tc_conntrack.c
+++ b/drivers/net/ethernet/sfc/tc_conntrack.c
@@ -16,7 +16,7 @@ static int efx_tc_flow_block(enum tc_setup_type type, void *type_data,
 			     void *cb_priv);
 
 static const struct rhashtable_params efx_tc_ct_zone_ht_params = {
-	.key_len	= offsetof(struct efx_tc_ct_zone, linkage),
+	.key_len	= sizeof_field(struct efx_tc_ct_zone, zone),
 	.key_offset	= 0,
 	.head_offset	= offsetof(struct efx_tc_ct_zone, linkage),
 };
-- 
2.25.1