Re: [PATCH net-next 0/3] support changing steering policies in tuntap

From	Tom Herbert <tom@herbertland.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH net-next 0/3] support changing steering policies in tuntap
Date	2017-09-28 07:10 +0200
Message-ID	<uuzfb-4BT-5@gated-at.bofh.it> (permalink)
References	<uufTb-8kl-3@gated-at.bofh.it> <uusQp-sS-13@gated-at.bofh.it> <uutW9-17I-3@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Wed, Sep 27, 2017 at 4:25 PM, Willem de Bruijn
<willemdebruijn.kernel@gmail.com> wrote:
>>> In the future, both simple and sophisticated policy like RSS or other guest
>>> driven steering policies could be done on top.
>>
>> IMHO there should be a more practical example before adding all this
>> indirection. And it would be nice to understand why this queue selection
>> needs to be tun specific.
>
> I was thinking the same and this reminds me of the various strategies
> implemented in packet fanout. tun_cpu_select_queue is analogous to
> fanout_demux_cpu though it is tun-specific in that it requires tun->numqueues.
>
> Fanout accrued various strategies until it gained an eBPF variant. Just
> supporting BPF is probably sufficient here, too.

+1, in addition to packet fanout, we have SO_REUSEPORT with BPF, RPS,
RFS, etc. It would be nice if existing packet steering mechanisms
could be leveraged for tun.

Thread

[PATCH net-next 0/3] support changing steering policies in tuntap Jason Wang <jasowang@redhat.com> - 2017-09-27 10:30 +0200
  [PATCH net-next 3/3] tun: introduce cpu id based steering policy Jason Wang <jasowang@redhat.com> - 2017-09-27 10:30 +0200
  Re: [PATCH net-next 0/3] support changing steering policies in tuntap "Michael S. Tsirkin" <mst@redhat.com> - 2017-09-28 00:20 +0200
    Re: [PATCH net-next 0/3] support changing steering policies in tuntap Willem de Bruijn <willemdebruijn.kernel@gmail.com> - 2017-09-28 01:30 +0200
      Re: [PATCH net-next 0/3] support changing steering policies in tuntap Tom Herbert <tom@herbertland.com> - 2017-09-28 07:10 +0200
        Re: [PATCH net-next 0/3] support changing steering policies in tuntap Jason Wang <jasowang@redhat.com> - 2017-09-28 10:00 +0200
      Re: [PATCH net-next 0/3] support changing steering policies in tuntap Jason Wang <jasowang@redhat.com> - 2017-09-28 09:30 +0200
        Re: [PATCH net-next 0/3] support changing steering policies in tuntap Willem de Bruijn <willemdebruijn.kernel@gmail.com> - 2017-09-28 18:10 +0200
          Re: [PATCH net-next 0/3] support changing steering policies in tuntap Jason Wang <jasowang@redhat.com> - 2017-09-29 11:50 +0200
          Re: [PATCH net-next 0/3] support changing steering policies in tuntap "Michael S. Tsirkin" <mst@redhat.com> - 2017-10-01 05:30 +0200
    Re: [PATCH net-next 0/3] support changing steering policies in tuntap Jason Wang <jasowang@redhat.com> - 2017-09-28 09:00 +0200

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