diff mbox series

[v2] bpf: fix the xdp_adjust_tail sample prog issue

Message ID 20240930024115.52841-1-chenyuan_fl@163.com (mailing list archive)
State Accepted
Commit 4236f114a3ffbbfd217436c08852e94cae372f57
Delegated to: BPF
Headers show
Series [v2] bpf: fix the xdp_adjust_tail sample prog issue | expand

Checks

Context Check Description
netdev/tree_selection success Not a local patch
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Commit Message

Yuan Chen Sept. 30, 2024, 2:41 a.m. UTC 
From: Yuan Chen <chenyuan@kylinos.cn>

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>
---
 samples/bpf/xdp_adjust_tail_kern.c | 1 +
 1 file changed, 1 insertion(+)

Comments

patchwork-bot+netdevbpf@kernel.org Oct. 8, 2024, 3:30 a.m. UTC | #1 
Hello:

This patch was applied to bpf/bpf-next.git (master)
by Andrii Nakryiko <andrii@kernel.org>:

On Mon, 30 Sep 2024 10:41:15 +0800 you wrote:
> From: Yuan Chen <chenyuan@kylinos.cn>
> 
> 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.
> 
> [...]

Here is the summary with links:
  - [v2] bpf: fix the xdp_adjust_tail sample prog issue
    https://git.kernel.org/bpf/bpf-next/c/4236f114a3ff

You are awesome, thank you!
diff mbox series

Patch

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));
 }