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selftests/bpf: Fix test dynptr/test_dynptr_copy_xdp failure

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For arm64 64K page size, the bpf_dynptr_copy() in test dynptr/test_dynptr_copy_xdp
will succeed, but the test will failure with 4K page size. This patch made a change
so the test will fail expectedly for both 4K and 64K page sizes.

Signed-off-by: Yonghong Song <yonghong.song@linux.dev>
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Acked-by: Mykyta Yatsenko <yatsenko@meta.com>
Link: https://patch.msgid.link/20250725043435.208974-1-yonghong.song@linux.dev
This commit is contained in:
Yonghong Song 2025-07-24 21:34:35 -07:00 committed by Martin KaFai Lau
parent 4c82768e41
commit 90f791a975
1 changed files with 3 additions and 2 deletions
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5
tools/testing/selftests/bpf/progs/dynptr_success.c
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@ -611,11 +611,12 @@ int test_dynptr_copy_xdp(struct xdp_md *xdp)
struct bpf_dynptr ptr_buf, ptr_xdp;
char data[] = "qwertyuiopasdfghjkl";
char buf[32] = {'\0'};
__u32 len = sizeof(data);
__u32 len = sizeof(data), xdp_data_size;
int i, chunks = 200;
/* ptr_xdp is backed by non-contiguous memory */
bpf_dynptr_from_xdp(xdp, 0, &ptr_xdp);
xdp_data_size = bpf_dynptr_size(&ptr_xdp);
bpf_ringbuf_reserve_dynptr(&ringbuf, len * chunks, 0, &ptr_buf);
/* Destination dynptr is backed by non-contiguous memory */
@ -673,7 +674,7 @@ int test_dynptr_copy_xdp(struct xdp_md *xdp)
goto out;
}
if (bpf_dynptr_copy(&ptr_xdp, 2000, &ptr_xdp, 0, len * chunks) != -E2BIG)
if (bpf_dynptr_copy(&ptr_xdp, xdp_data_size - 3000, &ptr_xdp, 0, len * chunks) != -E2BIG)
err = 1;
out: