DigiGoon/android_kernel_xiaomi_sm8350
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

bpf: Fix the xdp_adjust_tail sample prog issue

Browse source 
[ Upstream commit 4236f114a3ffbbfd217436c08852e94cae372f57 ]

During the xdp_adjust_tail test, probabilistic failure occurs and SKB package
is discarded by the kernel. After checking the issues by tracking SKB package,
it is identified that they were caused by checksum errors. Refer to checksum
of the arch/arm64/include/asm/checksum.h for fixing.

v2: Based on Alexei Starovoitov's suggestions, it is necessary to keep the code
 implementation consistent.

Fixes: c6ffd1ff78 (bpf: add bpf_xdp_adjust_tail sample prog)
Signed-off-by: Yuan Chen <chenyuan@kylinos.cn>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20240930024115.52841-1-chenyuan_fl@163.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Yuan Chen 2024-09-30 10:41:15 +08:00 • committed by Greg Kroah-Hartman
parent 7913bf6f8c
commit de94dc8a1f
1 changed files with 1 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

1
samples/bpf/xdp_adjust_tail_kern.c
View file

@ -54,6 +54,7 @@ static __always_inline void swap_mac(void *data, struct ethhdr *orig_eth)
static __always_inline __u16 csum_fold_helper(__u32 csum)
{
csum = (csum & 0xffff) + (csum >> 16);
return ~((csum & 0xffff) + (csum >> 16));
}