linux-kernel - [PATCH] selftests/bpf: Fix test_xdp_adjust_tail

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Message-ID: <20250110103109.3670793-1-skb99@linux.ibm.com>
Date: Fri, 10 Jan 2025 16:01:09 +0530
From: Saket Kumar Bhaskar <skb99@...ux.ibm.com>
To: bpf@...r.kernel.org, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc: ast@...nel.org, hbathini@...ux.ibm.com, andrii@...nel.org,
        daniel@...earbox.net, davem@...emloft.net, kuba@...nel.org,
        hawk@...nel.org, martin.lau@...ux.dev, eddyz87@...il.com,
        song@...nel.org, yonghong.song@...ux.dev, john.fastabend@...il.com,
        kpsingh@...nel.org, sdf@...ichev.me, haoluo@...gle.com,
        jolsa@...nel.org, mykolal@...com, shuah@...nel.org
Subject: [PATCH] selftests/bpf: Fix test_xdp_adjust_tail_grow2 selftest on powerpc

On powerpc cache line size is 128 bytes, so skb_shared_info must be
aligned accordingly.

Signed-off-by: Saket Kumar Bhaskar <skb99@...ux.ibm.com>
---
 tools/testing/selftests/bpf/prog_tests/xdp_adjust_tail.c      | 2 ++
 tools/testing/selftests/bpf/progs/test_xdp_adjust_tail_grow.c | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/tools/testing/selftests/bpf/prog_tests/xdp_adjust_tail.c b/tools/testing/selftests/bpf/prog_tests/xdp_adjust_tail.c
index 53d6ad8c2257..b2b2d85dbb1b 100644
--- a/tools/testing/selftests/bpf/prog_tests/xdp_adjust_tail.c
+++ b/tools/testing/selftests/bpf/prog_tests/xdp_adjust_tail.c
@@ -82,6 +82,8 @@ static void test_xdp_adjust_tail_grow2(void)
 	/* SKB_DATA_ALIGN(sizeof(struct skb_shared_info)) */
 #if defined(__s390x__)
 	int tailroom = 512;
+#elif defined(__powerpc__)
+	int tailroom = 384;
 #else
 	int tailroom = 320;
 #endif
diff --git a/tools/testing/selftests/bpf/progs/test_xdp_adjust_tail_grow.c b/tools/testing/selftests/bpf/progs/test_xdp_adjust_tail_grow.c
index 81bb38d72ced..dc74d8cf9e3f 100644
--- a/tools/testing/selftests/bpf/progs/test_xdp_adjust_tail_grow.c
+++ b/tools/testing/selftests/bpf/progs/test_xdp_adjust_tail_grow.c
@@ -10,6 +10,8 @@ int _xdp_adjust_tail_grow(struct xdp_md *xdp)
 	/* SKB_DATA_ALIGN(sizeof(struct skb_shared_info)) */
 #if defined(__TARGET_ARCH_s390)
 	int tailroom = 512;
+#elif defined(__TARGET_ARCH_powerpc)
+	int tailroom = 384;
 #else
 	int tailroom = 320;
 #endif
-- 
2.43.5