lwn.git/tools/testing/selftests/bpf/prog_tests/xdp_pull_data.c, branch masterLinux kernel documentation tree maintained by Jonathan Corbethttp://mirrors.hust.edu.cn/git/lwn.git/atom?h=master2026-01-25T00:51:22+00:00selftests/bpf: Fix xdp_pull_data failure with 64K page2026-01-25T00:51:22+00:00Yonghong Songyonghong.song@linux.dev2026-01-23T05:51:28+00:00urn:sha1:c7900f225a102219f5fe2c1c93a7dec5467315ee
If the argument 'pull_len' of run_test() is 'PULL_MAX' or
'PULL_MAX | PULL_PLUS_ONE', the eventual pull_len size
will close to the page size. On arm64 systems with 64K pages,
the pull_len size will be close to 64K. But the existing buffer
will be close to 9000 which is not enough to pull.
For those failed run_tests(), make buff size to
pg_sz + (pg_sz / 2)
This way, there will be enough buffer space to pull
regardless of page size.
Tested-by: Alan Maguire <alan.maguire@oracle.com>
Cc: Amery Hung <ameryhung@gmail.com>
Signed-off-by: Yonghong Song <yonghong.song@linux.dev>
Acked-by: Amery Hung <ameryhung@gmail.com>
Link: https://lore.kernel.org/r/20260123055128.495265-1-yonghong.song@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
selftests/bpf: Test bpf_xdp_pull_data2025-09-23T20:35:12+00:00Amery Hungameryhung@gmail.com2025-09-22T23:33:55+00:00urn:sha1:323302f54db92dc1c80ff5b114c20f19ec0adf81
Test bpf_xdp_pull_data() with xdp packets with different layouts. The
xdp bpf program first checks if the layout is as expected. Then, it
calls bpf_xdp_pull_data(). Finally, it checks the 0xbb marker at offset
1024 using directly packet access.
Signed-off-by: Amery Hung <ameryhung@gmail.com>
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://patch.msgid.link/20250922233356.3356453-8-ameryhung@gmail.com