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Date:   Fri, 18 Jun 2021 11:35:29 +0200
From:   Stefano Garzarella <sgarzare@redhat.com>
To:     Jiang Wang <jiang.wang@bytedance.com>
Cc:     virtualization@lists.linux-foundation.org, stefanha@redhat.com,
        mst@redhat.com, arseny.krasnov@kaspersky.com,
        jhansen@vmware.comments, cong.wang@bytedance.com,
        duanxiongchun@bytedance.com, xieyongji@bytedance.com,
        chaiwen.cc@bytedance.com, Jason Wang <jasowang@redhat.com>,
        "David S. Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>,
        Steven Rostedt <rostedt@goodmis.org>,
        Ingo Molnar <mingo@redhat.com>,
        Colin Ian King <colin.king@canonical.com>,
        Jorgen Hansen <jhansen@vmware.com>,
        Andra Paraschiv <andraprs@amazon.com>,
        Norbert Slusarek <nslusarek@gmx.net>,
        Lu Wei <luwei32@huawei.com>,
        Alexander Popov <alex.popov@linux.com>, kvm@vger.kernel.org,
        netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [RFC v1 0/6] virtio/vsock: introduce SOCK_DGRAM support
Message-ID: <20210618093529.bxsv4qnryccivdsd@steredhat.lan>
References: <20210609232501.171257-1-jiang.wang@bytedance.com>
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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