netdev - Re: [PATCH 00/33] virtio-net: support AF

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Date:   Thu, 02 Feb 2023 15:41:44 +0100
From:   Paolo Abeni <pabeni@...hat.com>
To:     Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, netdev@...r.kernel.org
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Björn Töpel <bjorn@...nel.org>,
        Magnus Karlsson <magnus.karlsson@...el.com>,
        Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
        Jonathan Lemon <jonathan.lemon@...il.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Menglong Dong <imagedong@...cent.com>,
        Kuniyuki Iwashima <kuniyu@...zon.com>,
        Petr Machata <petrm@...dia.com>,
        virtualization@...ts.linux-foundation.org, bpf@...r.kernel.org
Subject: Re: [PATCH 00/33] virtio-net: support AF_XDP zero copy

On Thu, 2023-02-02 at 19:00 +0800, Xuan Zhuo wrote:
> XDP socket(AF_XDP) is an excellent bypass kernel network framework. The zero
> copy feature of xsk (XDP socket) needs to be supported by the driver. The
> performance of zero copy is very good. mlx5 and intel ixgbe already support
> this feature, This patch set allows virtio-net to support xsk's zerocopy xmit
> feature.
> 
> Virtio-net did not support per-queue reset, so it was impossible to support XDP
> Socket Zerocopy. At present, we have completed the work of Virtio Spec and
> Kernel in Per-Queue Reset. It is time for Virtio-Net to complete the support for
> the XDP Socket Zerocopy.
> 
> Virtio-net can not increase the queue at will, so xsk shares the queue with
> kernel.
> 
> On the other hand, Virtio-Net does not support generate interrupt manually, so
> when we wakeup tx xmit, we used some tips. If the CPU run by TX NAPI last time
> is other CPUs, use IPI to wake up NAPI on the remote CPU. If it is also the
> local CPU, then we wake up sofrirqd.

Thank you for the large effort.

Since this will likely need a few iterations, on next revision please
do split the work in multiple chunks to help the reviewer efforts -
from Documentation/process/maintainer-netdev.rst:

 - don't post large series (> 15 patches), break them up

In this case I guess you can split it in 1 (or even 2) pre-req series
and another one for the actual xsk zero copy support.

Thanks!

Paolo