linux-kernel - Re: [PATCH bpf-next v3 0/4] xdp: recycle Page Pool backed skbs built from XDP frames

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Date:   Tue, 14 Mar 2023 11:52:43 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Alexander Lobakin <aleksander.lobakin@...el.com>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
        Larysa Zaremba <larysa.zaremba@...el.com>,
        Toke Høiland-Jørgensen <toke@...hat.com>,
        Song Liu <song@...nel.org>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        Menglong Dong <imagedong@...cent.com>,
        Mykola Lysenko <mykolal@...com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>, bpf <bpf@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH bpf-next v3 0/4] xdp: recycle Page Pool backed skbs built
 from XDP frames

On Tue, Mar 14, 2023 at 4:58 AM Alexander Lobakin
<aleksander.lobakin@...el.com> wrote:
>
>   All error logs:
>   libbpf: prog 'trace_virtqueue_add_sgs': BPF program load failed: Bad
> address
>   libbpf: prog 'trace_virtqueue_add_sgs': -- BEGIN PROG LOAD LOG --
>   The sequence of 8193 jumps is too complex.
>   verification time 77808 usec
>   stack depth 64
>   processed 156616 insns (limit 1000000) max_states_per_insn 8
> total_states 1754 peak_states 1712 mark_read 12
>   -- END PROG LOAD LOG --
>   libbpf: prog 'trace_virtqueue_add_sgs': failed to load: -14
>   libbpf: failed to load object 'loop6.bpf.o'
>   scale_test:FAIL:expect_success unexpected error: -14 (errno 14)
>   #257     verif_scale_loop6:FAIL
>   Summary: 288/1766 PASSED, 21 SKIPPED, 1 FAILED
>
> So, xdp_do_redirect, which was previously failing, now works fine. OTOH,
> "verif_scale_loop6" now fails, but from what I understand from the log,
> it has nothing with the series ("8193 jumps is too complex" -- I don't
> even touch program-related stuff). I don't know what's the reason of it
> failing, can it be some CI issues or maybe some recent commits?

Yeah. It's an issue with the latest clang.
We don't have a workaround for this yet.
It's not a blocker for your patchset.
We didn't have time to look at it closely.