[PATCH bpf-next v2 10/31] selftests/bpf: Fix xdp_do_redirect on s390x

Ilya Leoshkevich
2023-01-28T00:07:43Z

s390x cache line size is 256 bytes, so skb_shared_info must be aligned
on a much larger boundary than for x86. This makes the maximum packet
size smaller.

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
---
tools/testing/selftests/bpf/prog_tests/xdp_do_redirect.c | 4 ++++
1 file changed, 4 insertions(+)

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 a50971c6cf4a..ac70e871d62f 100644
--- a/tools/testing/selftests/bpf/prog_tests/xdp_do_redirect.c
+++ b/tools/testing/selftests/bpf/prog_tests/xdp_do_redirect.c
@@ -65,7 +65,11 @@ static int attach_tc_prog(struct bpf_tc_hook *hook, int fd)
/* The maximum permissible size is: PAGE_SIZE - sizeof(struct xdp_page_head) -
* sizeof(struct skb_shared_info) - XDP_PACKET_HEADROOM = 3368 bytes
*/
+#if defined(__s390x__)
+#define MAX_PKT_SIZE 3176
+#else
#define MAX_PKT_SIZE 3368
+#endif
static void test_max_pkt_size(int fd)
{
char data[MAX_PKT_SIZE + 1] = {};
--
2.39.1