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bpf: Fix the xdp_adjust_tail sample prog issue

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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
This commit is contained in:
Yuan Chen 2024-09-30 10:41:15 +08:00 committed by Andrii Nakryiko
parent 19090f0306
commit 4236f114a3
1 changed files with 1 additions and 0 deletions
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samples/bpf/xdp_adjust_tail_kern.c
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@ -57,6 +57,7 @@ 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));
}