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Tsirkin" To: Maciej Fijalkowski Subject: Re: [PATCH 00/33] virtio-net: support AF_XDP zero copy Message-ID: <20230203040855-mutt-send-email-mst@kernel.org> References: <20230202110058.130695-1-xuanzhuo@linux.alibaba.com> <5fda6140fa51b4d2944f77b9e24446e4625641e2.camel@redhat.com> <1675395211.6279888-2-xuanzhuo@linux.alibaba.com> <20230203033405-mutt-send-email-mst@kernel.org> MIME-Version: 1.0 In-Reply-To: X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Disposition: inline Cc: Petr Machata , Menglong Dong , Jesper Dangaard Brouer , Daniel Borkmann , netdev@vger.kernel.org, John Fastabend , =?iso-8859-1?Q?Bj=F6rn_T=F6pel?= , Alexei Starovoitov , Eric Dumazet , Kuniyuki Iwashima , Sebastian Andrzej Siewior , Jonathan Lemon , Jakub Kicinski , bpf@vger.kernel.org, Paolo Abeni , virtualization@lists.linux-foundation.org, "David S. Miller" , Magnus Karlsson X-BeenThere: virtualization@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Linux virtualization List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: virtualization-bounces@lists.linux-foundation.org Sender: "Virtualization" On Fri, Feb 03, 2023 at 09:46:46AM +0100, Maciej Fijalkowski wrote: > 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 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. I agree here. Some unrelated refactoring can also be deferred. > However, I would like to ask to check how this series > affects existing ZC enabled driver(s), since xsk core is touched. > > > > > > > > > > > > > > > > Thanks! > > > > > > > > Paolo > > > > > > _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization