netdev - Re: [PATCH bpf-next V3 3/6] selftests/bpf: xdp_hw

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Date:   Wed, 22 Mar 2023 09:09:05 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Jesper Dangaard Brouer <brouer@...hat.com>
Cc:     bpf <bpf@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Martin KaFai Lau <martin.lau@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Alexander Lobakin <alexandr.lobakin@...el.com>,
        Larysa Zaremba <larysa.zaremba@...el.com>,
        xdp-hints@...-project.net, anthony.l.nguyen@...el.com,
        "Song, Yoong Siang" <yoong.siang.song@...el.com>,
        "Ong, Boon Leong" <boon.leong.ong@...el.com>,
        intel-wired-lan <intel-wired-lan@...ts.osuosl.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        John Fastabend <john.fastabend@...il.com>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH bpf-next V3 3/6] selftests/bpf: xdp_hw_metadata RX hash
 return code info

On Wed, Mar 22, 2023 at 9:01 AM Jesper Dangaard Brouer
<brouer@...hat.com> wrote:
>
> When driver developers add XDP-hints kfuncs for RX hash it is
> practical to print the return code in bpf_printk trace pipe log.
>
> Print hash value as a hex value, both AF_XDP userspace and bpf_prog,
> as this makes it easier to spot poor quality hashes.
>
> Signed-off-by: Jesper Dangaard Brouer <brouer@...hat.com>
> Acked-by: Stanislav Fomichev <sdf@...gle.com>
> ---
>  .../testing/selftests/bpf/progs/xdp_hw_metadata.c  |    9 ++++++---
>  tools/testing/selftests/bpf/xdp_hw_metadata.c      |    5 ++++-
>  2 files changed, 10 insertions(+), 4 deletions(-)
>
> diff --git a/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c b/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c
> index 40c17adbf483..ce07010e4d48 100644
> --- a/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c
> +++ b/tools/testing/selftests/bpf/progs/xdp_hw_metadata.c
> @@ -77,10 +77,13 @@ int rx(struct xdp_md *ctx)
>                 meta->rx_timestamp = 0; /* Used by AF_XDP as not avail signal */
>         }
>
> -       if (!bpf_xdp_metadata_rx_hash(ctx, &meta->rx_hash))
> -               bpf_printk("populated rx_hash with %u", meta->rx_hash);
> -       else
> +       ret = bpf_xdp_metadata_rx_hash(ctx, &meta->rx_hash);
> +       if (ret >= 0) {
> +               bpf_printk("populated rx_hash with 0x%08X", meta->rx_hash);
> +       } else {
> +               bpf_printk("rx_hash not-avail errno:%d", ret);
>                 meta->rx_hash = 0; /* Used by AF_XDP as not avail signal */
> +       }

Just noticed this mess of printks.
Please remove them all. selftests should not have them.