netdev - Re: [PATCH net-next v2 08/21] virtio_net: sq support premapped mode

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Date: Tue, 14 Nov 2023 11:55:52 +0800
From: Jason Wang <jasowang@...hat.com>
To: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
Cc: netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>, 
	Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
	"Michael S. Tsirkin" <mst@...hat.com>, Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, 
	Jesper Dangaard Brouer <hawk@...nel.org>, John Fastabend <john.fastabend@...il.com>, 
	virtualization@...ts.linux-foundation.org, bpf@...r.kernel.org
Subject: Re: [PATCH net-next v2 08/21] virtio_net: sq support premapped mode

On Tue, Nov 14, 2023 at 11:42 AM Xuan Zhuo <xuanzhuo@...ux.alibaba.com> wrote:
>
> On Tue, 14 Nov 2023 11:26:42 +0800, Jason Wang <jasowang@...hat.com> wrote:
> > On Thu, Nov 9, 2023 at 7:06 PM Xuan Zhuo <xuanzhuo@...ux.alibaba.com> wrote:
> > >
> > > On Thu, 9 Nov 2023 14:37:38 +0800, Jason Wang <jasowang@...hat.com> wrote:
> > > > On Tue, Nov 7, 2023 at 11:12 AM Xuan Zhuo <xuanzhuo@...ux.alibaba.com> wrote:
> > > > >
> > > > > If the xsk is enabling, the xsk tx will share the send queue.
> > > > > But the xsk requires that the send queue use the premapped mode.
> > > > > So the send queue must support premapped mode.
> > > > >
> > > > > Signed-off-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
> > > > > ---
> > > > >  drivers/net/virtio/main.c       | 163 ++++++++++++++++++++++++++++----
> > > > >  drivers/net/virtio/virtio_net.h |  16 ++++
> > > > >  2 files changed, 163 insertions(+), 16 deletions(-)
> > > > >

[...]

> > > >
> > > > I think we need to seek a way to reuse what has been stored by virtio
> > > > core. It should be much more efficient.
> > >
> > >
> > > Yes.
> > >
> > > But that is for net-next branch.
> > >
> > > Can we do that as a fix after that is merged to 6.8?
> >
> > We still have time. I would like to do it from the start.
>
>
> I want to finish the job including new AF_XDP ZC feature.
> Because that this must wait the merge window.
> Base on that, the optimizing work can be done everytime.
>
> If we work from the new virtio prepare, that can be merged to 6.8.
> And the AF_XDP zc must wait 6.9. right?

It can be part of this series. Or anything I missed?

My understanding is that, since the information is handy, it just
requires new helpers. So I don't expect it needs a large series.

Thanks

>
> Thanks
>