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selftests/bpf: Fix xdp_do_redirect failure with 64KB page size

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On arm64 with 64KB page size, the selftest xdp_do_redirect failed like
below:
  ...
  test_xdp_do_redirect:PASS:pkt_count_tc 0 nsec
  test_max_pkt_size:PASS:prog_run_max_size 0 nsec
  test_max_pkt_size:FAIL:prog_run_too_big unexpected prog_run_too_big: actual -28 != expected -22

With 64KB page size, the xdp frame size will be much bigger so
the existing test will fail.

Adjust various parameters so the test can also work on 64K page size.

Signed-off-by: Yonghong Song <yonghong.song@linux.dev>
Link: https://lore.kernel.org/r/20250612035042.2208630-1-yonghong.song@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Yonghong Song
2025-06-11 20:50:42 -07:00
committed by Alexei Starovoitov
parent 96fcf7e7a7
commit 44df9e0d4e
1 changed files with 11 additions and 2 deletions
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13
tools/testing/selftests/bpf/prog_tests/xdp_do_redirect.c
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@@ -66,16 +66,25 @@ static int attach_tc_prog(struct bpf_tc_hook *hook, int fd)
#else
#define MAX_PKT_SIZE 3408
#endif
#define PAGE_SIZE_4K 4096
#define PAGE_SIZE_64K 65536
static void test_max_pkt_size(int fd)
{
char data[MAX_PKT_SIZE + 1] = {};
char data[PAGE_SIZE_64K + 1] = {};
int err;
DECLARE_LIBBPF_OPTS(bpf_test_run_opts, opts,
.data_in = &data,
.data_size_in = MAX_PKT_SIZE,
.flags = BPF_F_TEST_XDP_LIVE_FRAMES,
.repeat = 1,
);
if (getpagesize() == PAGE_SIZE_64K)
opts.data_size_in = MAX_PKT_SIZE + PAGE_SIZE_64K - PAGE_SIZE_4K;
else
opts.data_size_in = MAX_PKT_SIZE;
err = bpf_prog_test_run_opts(fd, &opts);
ASSERT_OK(err, "prog_run_max_size");