netdev - Re: [PATCH RFC net-next] virtio_net: Relax queue requirement for using XDP

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Date:   Wed, 26 Feb 2020 08:58:47 -0700
From:   David Ahern <dahern@...italocean.com>
To:     Toke Høiland-Jørgensen <toke@...hat.com>,
        "Michael S. Tsirkin" <mst@...hat.com>
Cc:     David Ahern <dsahern@...il.com>, Jason Wang <jasowang@...hat.com>,
        David Ahern <dsahern@...nel.org>, netdev@...r.kernel.org,
        davem@...emloft.net, kuba@...nel.org
Subject: Re: [PATCH RFC net-next] virtio_net: Relax queue requirement for
 using XDP

On 2/26/20 1:34 AM, Toke Høiland-Jørgensen wrote:
>>
>> OK so basically there would be commands to configure which TX queue is
>> used by XDP. With enough resources default is to use dedicated queues.
>> With not enough resources default is to fail binding xdp program
>> unless queues are specified. Does this sound reasonable?
> 
> Yeah, that was the idea. See this talk from LPC last year for more
> details: https://linuxplumbersconf.org/event/4/contributions/462/

 Hopefully such a design is only required for a program doing a Tx path
(XDP_TX or XDP_REDIRECT). i.e., a program just doing basic ACL, NAT, or
even encap, decap, should not have to do anything with Tx queues to load
and run the program.