[PATCH bpf-next V1 2/7] selftests/bpf: Adjust test for maximum packet size in xdp_do_redirect

Jesper Dangaard Brouer
2025-06-03T17:46:06Z

Patchset increased xdp_buff with a pointer 8 bytes, and the bpf/test_run
struct xdp_page_head have two xdp_buff's. Thus adjust test with 16 bytes.

Signed-off-by: Jesper Dangaard Brouer <hawk@kernel.org>
---
.../selftests/bpf/prog_tests/xdp_do_redirect.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/tools/testing/selftests/bpf/prog_tests/xdp_do_redirect.c b/tools/testing/selftests/bpf/prog_tests/xdp_do_redirect.c
index 7dac044664ac..25904348b954 100644
--- a/tools/testing/selftests/bpf/prog_tests/xdp_do_redirect.c
+++ b/tools/testing/selftests/bpf/prog_tests/xdp_do_redirect.c
@@ -59,12 +59,12 @@ static int attach_tc_prog(struct bpf_tc_hook *hook, int fd)

/* The maximum permissible size is: PAGE_SIZE - sizeof(struct xdp_page_head) -
* SKB_DATA_ALIGN(sizeof(struct skb_shared_info)) - XDP_PACKET_HEADROOM =
- * 3408 bytes for 64-byte cacheline and 3216 for 256-byte one.
+ * 3392 bytes for 64-byte cacheline and 3200 for 256-byte one.
*/
#if defined(__s390x__)
-#define MAX_PKT_SIZE 3216
+#define MAX_PKT_SIZE 3200
#else
-#define MAX_PKT_SIZE 3408
+#define MAX_PKT_SIZE 3392
#endif
static void test_max_pkt_size(int fd)
{