netdev - Re: [xdp-hints] [PATCH bpf-next v2 8/8] selftests/bpf: Simple program to dump XDP RX metadata

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Date:   Wed, 23 Nov 2022 10:29:23 -0800
From:   Stanislav Fomichev <sdf@...gle.com>
To:     Toke Høiland-Jørgensen <toke@...hat.com>
Cc:     bpf@...r.kernel.org, ast@...nel.org, daniel@...earbox.net,
        andrii@...nel.org, martin.lau@...ux.dev, song@...nel.org,
        yhs@...com, john.fastabend@...il.com, kpsingh@...nel.org,
        haoluo@...gle.com, jolsa@...nel.org,
        David Ahern <dsahern@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Willem de Bruijn <willemb@...gle.com>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Anatoly Burakov <anatoly.burakov@...el.com>,
        Alexander Lobakin <alexandr.lobakin@...el.com>,
        Magnus Karlsson <magnus.karlsson@...il.com>,
        Maryam Tahhan <mtahhan@...hat.com>, xdp-hints@...-project.net,
        netdev@...r.kernel.org
Subject: Re: [xdp-hints] [PATCH bpf-next v2 8/8] selftests/bpf: Simple program
 to dump XDP RX metadata

On Wed, Nov 23, 2022 at 6:26 AM Toke Høiland-Jørgensen <toke@...hat.com> wrote:
>
> Stanislav Fomichev <sdf@...gle.com> writes:
>
> > +static int rxq_num(const char *ifname)
> > +{
> > +     struct ethtool_channels ch = {
> > +             .cmd = ETHTOOL_GCHANNELS,
> > +     };
> > +
> > +     struct ifreq ifr = {
> > +             .ifr_data = (void *)&ch,
> > +     };
> > +     strcpy(ifr.ifr_name, ifname);
> > +     int fd, ret;
> > +
> > +     fd = socket(AF_UNIX, SOCK_DGRAM, 0);
> > +     if (fd < 0)
> > +             error(-1, errno, "socket");
> > +
> > +     ret = ioctl(fd, SIOCETHTOOL, &ifr);
> > +     if (ret < 0)
> > +             error(-1, errno, "socket");
> > +
> > +     close(fd);
> > +
> > +     return ch.rx_count;
> > +}
>
> mlx5 uses 'combined' channels, so this returns 0. Changing it to just:
>
> return ch.rx_count ?: ch.combined_count;
>
> works though :)

Perfect, will do the same :-) Thank you for running and testing!

> -Toke
>