netdev - Re: [PATCH bpf-next 1/2] bpf: expose __sk_buff wire_len/gso_segs to BPF_PROG_TEST

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Date:   Fri, 13 Dec 2019 12:55:30 -0800
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Stanislav Fomichev <sdf@...gle.com>
Cc:     Network Development <netdev@...r.kernel.org>,
        bpf <bpf@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>
Subject: Re: [PATCH bpf-next 1/2] bpf: expose __sk_buff wire_len/gso_segs to BPF_PROG_TEST_RUN

On Wed, Dec 11, 2019 at 9:53 AM Stanislav Fomichev <sdf@...gle.com> wrote:
>
> wire_len should not be less than real len and is capped by GSO_MAX_SIZE.
> gso_segs is capped by GSO_MAX_SEGS.
>
> Signed-off-by: Stanislav Fomichev <sdf@...gle.com>

This change breaks tests:
./test_progs -n 16
test_kfree_skb:PASS:prog_load sched cls 0 nsec
test_kfree_skb:PASS:prog_load raw tp 0 nsec
test_kfree_skb:PASS:find_prog 0 nsec
test_kfree_skb:PASS:find_prog 0 nsec
test_kfree_skb:PASS:find_prog 0 nsec
test_kfree_skb:PASS:find global data 0 nsec
test_kfree_skb:PASS:attach_raw_tp 0 nsec
test_kfree_skb:PASS:attach fentry 0 nsec
test_kfree_skb:PASS:attach fexit 0 nsec
test_kfree_skb:PASS:find_perf_buf_map 0 nsec
test_kfree_skb:PASS:perf_buf__new 0 nsec
test_kfree_skb:FAIL:ipv6 err -1 errno 22 retval 0 duration 0
on_sample:PASS:check_size 0 nsec
on_sample:PASS:check_meta_ifindex 0 nsec
on_sample:PASS:check_cb8_0 0 nsec
on_sample:PASS:check_cb32_0 0 nsec
on_sample:PASS:check_eth 0 nsec
on_sample:PASS:check_ip 0 nsec
on_sample:PASS:check_tcp 0 nsec
test_kfree_skb:PASS:perf_buffer__poll 0 nsec
test_kfree_skb:PASS:get_result 0 nsec
#16 kfree_skb:FAIL
Summary: 0/0 PASSED, 0 SKIPPED, 1 FAILED