netdev - Re: Per-queue XDP programs, thoughts

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Date:   Tue, 16 Apr 2019 18:15:12 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Jesper Dangaard Brouer <brouer@...hat.com>,
        Björn Töpel <bjorn.topel@...el.com>
Cc:     Björn Töpel <bjorn.topel@...il.com>,
        ilias.apalodimas@...aro.org, toke@...hat.com,
        magnus.karlsson@...el.com, maciej.fijalkowski@...el.com,
        Alexei Starovoitov <ast@...com>,
        Daniel Borkmann <borkmann@...earbox.net>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        John Fastabend <john.fastabend@...il.com>,
        David Miller <davem@...emloft.net>,
        Andy Gospodarek <andy@...yhouse.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        bpf@...r.kernel.org, Thomas Graf <tgraf@...g.ch>,
        Thomas Monjalon <thomas@...jalon.net>
Subject: Re: Per-queue XDP programs, thoughts


On 2019/4/16 上午12:32, Jesper Dangaard Brouer wrote:
>> If we'd like to slice a netdevice into multiple queues. Isn't macvlan
>> or similar*virtual*  netdevices a better path, instead of introducing
>> yet another abstraction?
> XDP redirect a more generic abstraction that allow us to implement
> macvlan.  Except macvlan driver is missing ndo_xdp_xmit. Again first I
> write this as global-netdev XDP-prog, that does a lookup in a BPF-map.
> Next I configure HW filters that match the MAC-addr into a queue# and
> attach simpler XDP-prog to queue#, that redirect into macvlan device.


I'm afraid what we want is a full XDP support for macvlan (RX) not only 
a XDP TX support? This could not be done through XDP_REDIRECT. If we 
want to use  XDP_REDIRECT, we should implement XDP support for ifb then 
redirect packet there.

Thanks