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

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Date:   Wed, 15 Mar 2023 10:56:25 +0100
From:   Alexander Lobakin <aleksander.lobakin@...el.com>
To:     Alexei Starovoitov <alexei.starovoitov@...il.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>,
        "Ilya Leoshkevich" <iii@...ux.ibm.com>
Subject: Re: [PATCH bpf-next v3 0/4] xdp: recycle Page Pool backed skbs built
 from XDP frames

From: Alexei Starovoitov <alexei.starovoitov@...il.com>
Date: Tue, 14 Mar 2023 16:54:25 -0700

> On Tue, Mar 14, 2023 at 11:52 AM Alexei Starovoitov
> <alexei.starovoitov@...il.com> wrote:

[...]

> test_xdp_do_redirect:PASS:prog_run 0 nsec
> test_xdp_do_redirect:PASS:pkt_count_xdp 0 nsec
> test_xdp_do_redirect:PASS:pkt_count_zero 0 nsec
> test_xdp_do_redirect:FAIL:pkt_count_tc unexpected pkt_count_tc: actual
> 220 != expected 9998
> test_max_pkt_size:PASS:prog_run_max_size 0 nsec
> test_max_pkt_size:PASS:prog_run_too_big 0 nsec
> close_netns:PASS:setns 0 nsec
> #289 xdp_do_redirect:FAIL
> Summary: 270/1674 PASSED, 30 SKIPPED, 1 FAILED
> 
> Alex,
> could you please take a look at why it's happening?
> 
> I suspect it's an endianness issue in:
>         if (*metadata != 0x42)
>                 return XDP_ABORTED;
> but your patch didn't change that,
> so I'm not sure why it worked before.

Sure, lemme fix it real quick.

Thanks,
Olek