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

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Message-ID: <174897276136.1677018.3898333067847227284.stgit@firesoul>
Date: Tue, 03 Jun 2025 19:46:01 +0200
From: Jesper Dangaard Brouer <hawk@...nel.org>
To: bpf@...r.kernel.org, netdev@...r.kernel.org,
 Jakub Kicinski <kuba@...nel.org>, lorenzo@...nel.org
Cc: Jesper Dangaard Brouer <hawk@...nel.org>,
 Alexei Starovoitov <ast@...nel.org>,
 Daniel Borkmann <borkmann@...earbox.net>,
 Eric Dumazet <eric.dumazet@...il.com>,
 "David S. Miller" <davem@...emloft.net>, Paolo Abeni <pabeni@...hat.com>,
 sdf@...ichev.me, kernel-team@...udflare.com, arthur@...hurfabre.com,
 jakub@...udflare.com
Subject: [PATCH bpf-next V1 2/7] selftests/bpf: Adjust test for maximum packet
 size in xdp_do_redirect

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@...nel.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)
 {