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From:   Xu Kuohai <xukuohai@huaweicloud.com>
To:     bpf@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-kselftest@vger.kernel.org, netdev@vger.kernel.org
Cc:     Alexei Starovoitov <ast@kernel.org>,
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        Martin KaFai Lau <martin.lau@linux.dev>,
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        Hao Luo <haoluo@google.com>, Jiri Olsa <jolsa@kernel.org>,
        Mykola Lysenko <mykolal@fb.com>, Shuah Khan <shuah@kernel.org>,
        "David S . Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>,
        Jesper Dangaard Brouer <hawk@kernel.org>,
        Kumar Kartikeya Dwivedi <memxor@gmail.com>,
        Alan Maguire <alan.maguire@oracle.com>,
        Delyan Kratunov <delyank@fb.com>,
        Lorenzo Bianconi <lorenzo@kernel.org>
Subject: [PATCH bpf-next v4 5/6] selftests/bpf: Fix error failure of case test_xdp_adjust_tail_grow
Date:   Tue, 11 Oct 2022 08:01:07 -0400
Message-Id: <20221011120108.782373-6-xukuohai@huaweicloud.com>
In-Reply-To: <20221011120108.782373-1-xukuohai@huaweicloud.com>
References: <20221011120108.782373-1-xukuohai@huaweicloud.com>
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From: Xu Kuohai <xukuohai@huawei.com>

test_xdp_adjust_tail_grow failed with ipv6:
  test_xdp_adjust_tail_grow:FAIL:ipv6 unexpected error: -28 (errno 28)

The reason is that this test case tests ipv4 before ipv6, and when ipv4
test finished, topts.data_size_out was set to 54, which is smaller than the
ipv6 output data size 114, so ipv6 test fails with NOSPC error.

Fix it by reset topts.data_size_out to sizeof(buf) before testing ipv6.

Fixes: 04fcb5f9a104 ("selftests/bpf: Migrate from bpf_prog_test_run")
Signed-off-by: Xu Kuohai <xukuohai@huawei.com>
---
 tools/testing/selftests/bpf/prog_tests/xdp_adjust_tail.c | 1 +
 1 file changed, 1 insertion(+)

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 9b9cf8458adf..009ee37607df 100644
--- a/tools/testing/selftests/bpf/prog_tests/xdp_adjust_tail.c
+++ b/tools/testing/selftests/bpf/prog_tests/xdp_adjust_tail.c
@@ -63,6 +63,7 @@ static void test_xdp_adjust_tail_grow(void)
 	expect_sz = sizeof(pkt_v6) + 40; /* Test grow with 40 bytes */
 	topts.data_in = &pkt_v6;
 	topts.data_size_in = sizeof(pkt_v6);
+	topts.data_size_out = sizeof(buf);
 	err = bpf_prog_test_run_opts(prog_fd, &topts);
 	ASSERT_OK(err, "ipv6");
 	ASSERT_EQ(topts.retval, XDP_TX, "ipv6 retval");
-- 
2.30.2