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Message-ID: <20201113115515.3886b224@carbon>
Date:   Fri, 13 Nov 2020 11:55:15 +0100
From:   Jesper Dangaard Brouer <jbrouer@...hat.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, netdev@...r.kernel.org,
        bpf@...r.kernel.org, ast@...nel.org, daniel@...earbox.net,
        hawk@...nel.org, john.fastabend@...il.com, mst@...hat.com,
        davem@...emloft.net, kuba@...nel.org,
        Lorenzo Bianconi <lorenzo.bianconi@...hat.com>,
        Eelco Chaudron <echaudro@...hat.com>,
        David Ahern <dsahern@...nel.org>,
        "Jubran, Samih" <sameehj@...zon.com>,
        "Machulsky, Zorik" <zorik@...zon.com>,
        Shay Agroskin <shayagr@...zon.com>
Subject: Re: [PATCH netdev 1/2] virtio: add module option to turn off guest
 offloads

On Fri, 13 Nov 2020 09:05:19 +0800
Jason Wang <jasowang@...hat.com> wrote:

> On 2020/11/12 下午4:11, Xuan Zhuo wrote:
> > * VIRTIO_NET_F_GUEST_CSUM
> > * VIRTIO_NET_F_GUEST_TSO4
> > * VIRTIO_NET_F_GUEST_TSO6
> > * VIRTIO_NET_F_GUEST_ECN
> > * VIRTIO_NET_F_GUEST_UFO
> > * VIRTIO_NET_F_MTU
> >
> > If these features are negotiated successfully, it may cause virtio-net to
> > receive large packages, which will cause xdp to fail to load. 

I really want the people that implement XDP multi-buffer support, to
think about how this can help virtio-net overcome these limitations.

IHMO XDP need to evolve to support these features for virtio-net.

-- 
Best regards,
  Jesper Dangaard Brouer
  MSc.CS, Principal Kernel Engineer at Red Hat
  LinkedIn: http://www.linkedin.com/in/brouer

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