On Fri, Feb 03, 2023 at 03:37:32AM -0500, Michael S. Tsirkin wrote: > On Fri, Feb 03, 2023 at 11:33:31AM +0800, Xuan Zhuo wrote: > > On Thu, 02 Feb 2023 15:41:44 +0100, Paolo Abeni <pabeni@xxxxxxxxxx> wrote: > > > 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. > > > > > > OK. > > > > I can split patch into multiple parts such as > > > > * virtio core > > * xsk > > * virtio-net prepare > > * virtio-net support xsk zerocopy > > > > However, there is a problem, the virtio core part should enter the VHOST branch > > of Michael. Then, should I post follow-up patches to which branch vhost or > > next-next? > > > > Thanks. > > I personally think 33 patches is still manageable no need to split. > Do try to be careful and track acks and changes: if someone sends an ack > add it in the patch if you change the patch drop the acks, > and logs this fact in the changelog in the cover letter > so people know they need to re-review. To me some of the patches are too granular but probably this is related to personal taste. However, I would like to ask to check how this series affects existing ZC enabled driver(s), since xsk core is touched. > > > > > > > > > > Thanks! > > > > > > Paolo > > > >
