linux-kernel - [PATCH AUTOSEL 6.6 14/15] net/mlx5: DR, Fix 'stack guard page was hit' error in dr

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Message-ID: <20240805175736.3252615-14-sashal@kernel.org>
Date: Mon,  5 Aug 2024 13:57:11 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Yevgeny Kliteynik <kliteyn@...dia.com>,
	Alex Vesker <valex@...dia.com>,
	Tariq Toukan <tariqt@...dia.com>,
	Wojciech Drewek <wojciech.drewek@...el.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Sasha Levin <sashal@...nel.org>,
	saeedm@...dia.com,
	davem@...emloft.net,
	edumazet@...gle.com,
	pabeni@...hat.com,
	netdev@...r.kernel.org,
	linux-rdma@...r.kernel.org
Subject: [PATCH AUTOSEL 6.6 14/15] net/mlx5: DR, Fix 'stack guard page was hit' error in dr_rule

From: Yevgeny Kliteynik <kliteyn@...dia.com>

[ Upstream commit 94a3ad6c081381fa9ee523781789802b4ed00faf ]

This patch reduces the size of hw_ste_arr_optimized array that is
allocated on stack from 640 bytes (5 match STEs + 5 action STES)
to 448 bytes (2 match STEs + 5 action STES).
This fixes the 'stack guard page was hit' issue, while still fitting
majority of the usecases (up to 2 match STEs).

Signed-off-by: Yevgeny Kliteynik <kliteyn@...dia.com>
Reviewed-by: Alex Vesker <valex@...dia.com>
Signed-off-by: Tariq Toukan <tariqt@...dia.com>
Reviewed-by: Wojciech Drewek <wojciech.drewek@...el.com>
Link: https://patch.msgid.link/20240730061638.1831002-4-tariqt@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/ethernet/mellanox/mlx5/core/steering/dr_rule.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_rule.c b/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_rule.c
index 042ca03491243..d1db04baa1fa6 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_rule.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_rule.c
@@ -7,7 +7,7 @@
 /* don't try to optimize STE allocation if the stack is too constaraining */
 #define DR_RULE_MAX_STES_OPTIMIZED 0
 #else
-#define DR_RULE_MAX_STES_OPTIMIZED 5
+#define DR_RULE_MAX_STES_OPTIMIZED 2
 #endif
 #define DR_RULE_MAX_STE_CHAIN_OPTIMIZED (DR_RULE_MAX_STES_OPTIMIZED + DR_ACTION_MAX_STES)
 
-- 
2.43.0