This is a note to let you know that I've just added the patch titled
net/mlx5: DR, Fix crc32 calculation to work on big-endian (BE) CPUs
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
net-mlx5-dr-fix-crc32-calculation-to-work-on-big-endian-be-cpus.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 1e5daf5565b61a96e570865091589afc9156e3d3 Mon Sep 17 00:00:00 2001
From: Erez Shitrit <erezsh@xxxxxxxxxx>
Date: Thu, 9 Mar 2023 16:43:15 +0200
Subject: net/mlx5: DR, Fix crc32 calculation to work on big-endian (BE) CPUs
From: Erez Shitrit <erezsh@xxxxxxxxxx>
commit 1e5daf5565b61a96e570865091589afc9156e3d3 upstream.
When calculating crc for hash index we use the function crc32 that
calculates for little-endian (LE) arch.
Then we convert it to network endianness using htonl(), but it's wrong
to do the conversion in BE archs since the crc32 value is already LE.
The solution is to switch the bytes from the crc result for all types
of arc.
Fixes: 40416d8ede65 ("net/mlx5: DR, Replace CRC32 implementation to use kernel lib")
Signed-off-by: Erez Shitrit <erezsh@xxxxxxxxxx>
Reviewed-by: Alex Vesker <valex@xxxxxxxxxx>
Signed-off-by: Saeed Mahameed <saeedm@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/ethernet/mellanox/mlx5/core/steering/dr_ste.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_ste.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_ste.c
@@ -15,7 +15,8 @@ static u32 dr_ste_crc32_calc(const void
{
u32 crc = crc32(0, input_data, length);
- return (__force u32)htonl(crc);
+ return (__force u32)((crc >> 24) & 0xff) | ((crc << 8) & 0xff0000) |
+ ((crc >> 8) & 0xff00) | ((crc << 24) & 0xff000000);
}
bool mlx5dr_ste_supp_ttl_cs_recalc(struct mlx5dr_cmd_caps *caps)
Patches currently in stable-queue which might be from erezsh@xxxxxxxxxx are
queue-5.15/net-mlx5-dr-fix-crc32-calculation-to-work-on-big-endian-be-cpus.patch
