netdev - Re: [PATCH bpf-next v2 0/8] Simplify xdp_do_redirect_map()/xdp_do_flush

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Date:   Fri, 20 Dec 2019 11:29:59 +0100
From:   Toke Høiland-Jørgensen <toke@...hat.com>
To:     Jesper Dangaard Brouer <brouer@...hat.com>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     Björn Töpel <bjorn.topel@...il.com>,
        Network Development <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        bpf <bpf@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        John Fastabend <john.fastabend@...il.com>,
        "Karlsson\, Magnus" <magnus.karlsson@...el.com>,
        Jonathan Lemon <jonathan.lemon@...il.com>, brouer@...hat.com
Subject: Re: [PATCH bpf-next v2 0/8] Simplify xdp_do_redirect_map()/xdp_do_flush_map() and XDP maps

Jesper Dangaard Brouer <brouer@...hat.com> writes:

> On Fri, 20 Dec 2019 08:46:51 +0100
> Jesper Dangaard Brouer <brouer@...hat.com> wrote:
>
>> On Thu, 19 Dec 2019 21:21:39 -0800
>> Alexei Starovoitov <alexei.starovoitov@...il.com> wrote:
>> 
>> > > v1->v2 [1]:
>> > >   * Removed 'unused-variable' compiler warning (Jakub)
>> > >
>> > > [1] https://lore.kernel.org/bpf/20191218105400.2895-1-bjorn.topel@gmail.com/    
>> > 
>> > My understanding that outstanding discussions are not objecting to the
>> > core ideas of the patch set, hence applied. Thanks  
>> 
>> I had hoped to have time to review it in details today.  But as I don't
>> have any objecting to the core ideas, then I don't mind it getting
>> applied. We can just fix things in followups.
>
> I have now went over the entire patchset, and everything look perfect,
> I will go as far as saying it is brilliant.  We previously had the
> issue, that using different redirect maps in a BPF-prog would cause the
> bulking effect to be reduced, as map_to_flush cause previous map to get
> flushed. This is now solved :-)

Another thing that occurred to me while thinking about this: Now that we
have a single flush list, is there any reason we couldn't move the
devmap xdp_bulk_queue into struct net_device? That way it could also be
used for the non-map variant of bpf_redirect()?

-Toke