bpf: Fix the xdp_adjust_tail sample prog issue

[ 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 9151d80ea7

commit 0ec52d8451

1 changed files with 1 additions and 0 deletions

									
										samples/bpf/xdp_adjust_tail_kern.c
									
		+1
		
												View File
												
				@@ -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));

				}