netdev - Re: [PATCH bpf-next] cpumap: bulk skb using netif_receive_skb

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Message-ID: <YGX5j7RDQIXlh69L@lore-desk>
Date:   Thu, 1 Apr 2021 18:49:19 +0200
From:   Lorenzo Bianconi <lorenzo@...nel.org>
To:     Song Liu <song@...nel.org>
Cc:     bpf <bpf@...r.kernel.org>, Networking <netdev@...r.kernel.org>,
        lorenzo.bianconi@...hat.com,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jesper Dangaard Brouer <brouer@...hat.com>
Subject: Re: [PATCH bpf-next] cpumap: bulk skb using netif_receive_skb_list

> On Thu, Apr 1, 2021 at 1:57 AM Lorenzo Bianconi <lorenzo@...nel.org> wrote:
> >

[...]

> > -                       /* Inject into network stack */
> > -                       ret = netif_receive_skb_core(skb);
> > -                       if (ret == NET_RX_DROP)
> > -                               drops++;
> 
> I guess we stop tracking "drops" with this patch?
> 
> Thanks,
> Song

Hi Song,

we do not report the packets dropped by the stack but we still count the drops
in the cpumap. If you think they are really important I guess we can change
return value of netif_receive_skb_list returning the dropped packets or
similar. What do you think?

Regards,
Lorenzo

> 
> > +                       list_add_tail(&skb->list, &list);
> >                 }
> > +               netif_receive_skb_list(&list);
> > +
> >                 /* Feedback loop via tracepoint */
> >                 trace_xdp_cpumap_kthread(rcpu->map_id, n, drops, sched, &stats);
> >
> > --
> > 2.30.2
> >

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