Subject: [net 7/8] net/mlx5e: SHAMPO, Fix overflow of hd_per_wq

From: Saeed Mahameed <[email-masked]>
Date: Wed, 25 Sep 2024 13:20:12 -0700

From: Dragos Tatulea <[email-masked]>

When having larger RQ sizes and small MTUs sizes, the hd_per_wq variable
can overflow. Like in the following case:

$> ethtool --set-ring eth1 rx 8192
$> ip link set dev eth1 mtu 144
$> ethtool --features eth1 rx-gro-hw on

... yields in dmesg:

mlx5_core 0000:08:00.1: mlx5_cmd_out_err:808:(pid 194797): CREATE_MKEY(0x200) op_mod(0x0) failed, status bad parameter(0x3), syndrome (0x3bf6f), err(-22)

because hd_per_wq is 64K which overflows to 0 and makes the command
fail.

This patch increases the variable size to 32 bit.

Fixes: 99be56171fa9 ("net/mlx5e: SHAMPO, Re-enable HW-GRO")
Signed-off-by: Dragos Tatulea <[email-masked]>
Reviewed-by: Tariq Toukan <[email-masked]>
Signed-off-by: Saeed Mahameed <[email-masked]>
---
 drivers/net/ethernet/mellanox/mlx5/core/en.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en.h b/drivers/net/ethernet/mellanox/mlx5/core/en.h
index da0a1c65ec4a..57b7298a0e79 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en.h
@@ -627,7 +627,7 @@ struct mlx5e_shampo_hd {
 	struct mlx5e_dma_info *info;
 	struct mlx5e_frag_page *pages;
 	u16 curr_page_index;
-	u16 hd_per_wq;
+	u32 hd_per_wq;
 	u16 hd_per_wqe;
 	unsigned long *bitmap;
 	u16 pi;
-- 
2.46.1