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

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Date:   Fri, 18 Jun 2021 11:35:29 +0200
From:   Stefano Garzarella <sgarzare@...hat.com>
To:     Jiang Wang <jiang.wang@...edance.com>
Cc:     virtualization@...ts.linux-foundation.org, stefanha@...hat.com,
        mst@...hat.com, arseny.krasnov@...persky.com,
        jhansen@...are.comments, cong.wang@...edance.com,
        duanxiongchun@...edance.com, xieyongji@...edance.com,
        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,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC v1 0/6] virtio/vsock: introduce SOCK_DGRAM support

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.

Thanks,
Stefano