netdev - Re: [External] Re: [RFC v1 0/6] virtio/vsock: introduce SOCK

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Date:   Mon, 21 Jun 2021 10:21:44 -0700
From:   "Jiang Wang ." <jiang.wang@...edance.com>
To:     Stefano Garzarella <sgarzare@...hat.com>
Cc:     virtualization@...ts.linux-foundation.org,
        Stefan Hajnoczi <stefanha@...hat.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Arseny Krasnov <arseny.krasnov@...persky.com>,
        cong.wang@...edance.com,
        Xiongchun Duan <duanxiongchun@...edance.com>,
        Yongji Xie <xieyongji@...edance.com>,
        柴稳 <chaiwen.cc@...edance.com>,
        Jason Wang <jasowang@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>,
        Colin Ian King <colin.king@...onical.com>,
        Jorgen Hansen <jhansen@...are.com>,
        Andra Paraschiv <andraprs@...zon.com>,
        Norbert Slusarek <nslusarek@....net>,
        Lu Wei <luwei32@...wei.com>,
        Alexander Popov <alex.popov@...ux.com>, kvm@...r.kernel.org,
        Networking <netdev@...r.kernel.org>, linux-kernel@...r.kernel.org
Subject: Re: [External] Re: [RFC v1 0/6] virtio/vsock: introduce SOCK_DGRAM support

On Fri, Jun 18, 2021 at 2:35 AM Stefano Garzarella <sgarzare@...hat.com> wrote:
>
> On Wed, Jun 09, 2021 at 11:24:52PM +0000, Jiang Wang wrote:
> >This patchset implements support of SOCK_DGRAM for virtio
> >transport.
> >
> >Datagram sockets are connectionless and unreliable. To avoid unfair contention
> >with stream and other sockets, add two more virtqueues and
> >a new feature bit to indicate if those two new queues exist or not.
> >
> >Dgram does not use the existing credit update mechanism for
> >stream sockets. When sending from the guest/driver, sending packets
> >synchronously, so the sender will get an error when the virtqueue is full.
> >When sending from the host/device, send packets asynchronously
> >because the descriptor memory belongs to the corresponding QEMU
> >process.
> >
> >The virtio spec patch is here:
> >https://www.spinics.net/lists/linux-virtualization/msg50027.html
> >
> >For those who prefer git repo, here is the link for the linux kernel：
> >https://github.com/Jiang1155/linux/tree/vsock-dgram-v1
> >
> >qemu patch link:
> >https://github.com/Jiang1155/qemu/tree/vsock-dgram-v1
> >
> >
> >To do:
> >1. use skb when receiving packets
> >2. support multiple transport
> >3. support mergeable rx buffer
>
> Jiang, I'll do a fast review, but I think is better to rebase on
> net-next since SEQPACKET support is now merged.
>
> Please also run ./scripts/checkpatch.pl, there are a lot of issues.
>
> I'll leave some simple comments in the patches, but I prefer to do a
> deep review after the rebase and the dynamic handling of DGRAM.

Hi Stefano,

Sure. I will rebase and add dynamic handling of DGRAM. I run checkpatch.pl
at some point but I will make sure to run it again before submitting. Thanks.

Regards,

Jiang


> Thanks,
> Stefano
>