diff options
| author | Yuan Chen <chenyuan@kylinos.cn> | 2024-09-30 10:41:15 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-12-05 14:01:42 +0100 |
| commit | 0ec52d8451b2b7033986d4f5490c4aa2c6cfff5d (patch) | |
| tree | e3111637c01a1961047ca32bad2074a5163ea19e | |
| parent | 9151d80ea7f170b249ea1ccf3a8c36a70915f570 (diff) | |
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: c6ffd1ff7856 (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>
| -rw-r--r-- | samples/bpf/xdp_adjust_tail_kern.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/samples/bpf/xdp_adjust_tail_kern.c b/samples/bpf/xdp_adjust_tail_kern.c index ffdd548627f0..da67bcad1c63 100644 --- a/samples/bpf/xdp_adjust_tail_kern.c +++ b/samples/bpf/xdp_adjust_tail_kern.c @@ -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)); } |