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 12:57:00 +0100
From:   Alexander Lobakin <aleksander.lobakin@...el.com>
To:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>
CC:     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@...r.kernel.org>,
        <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH bpf-next v3 0/4] xdp: recycle Page Pool backed skbs built
 from XDP frames

From: Alexander Lobakin <aleksander.lobakin@...el.com>
Date: Mon, 13 Mar 2023 22:55:49 +0100

> Yeah, I still remember that "Who needs cpumap nowadays" (c), but anyway.
> 
> __xdp_build_skb_from_frame() missed the moment when the networking stack
> became able to recycle skb pages backed by a page_pool. This was making
> e.g. cpumap redirect even less effective than simple %XDP_PASS. veth was
> also affected in some scenarios.
[...]

Regarding failing tests, here's a piece of logs:

  #288     xdp_devmap_attach:OK
  [  156.324473] IPv6: ADDRCONF(NETDEV_CHANGE): veth_src: link becomes ready
  [  156.362859] bond2 (unregistering): Released all slaves
  #289     xdp_do_redirect:OK
  #290     xdp_info:OK

[...]

  #297/1   xfrm_info/xfrm_info:OK
  #297     xfrm_info:OK

  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?

Thanks,
Olek