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bpf: Fix the xdp_adjust_tail sample prog issue

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[ Upstream commit 4236f114a3 ]

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 4e0e9e7af5
commit a6fee1be65
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));
}