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Date:   Tue, 16 Aug 2022 12:10:25 +0000
From:   Bobby Eshleman <bobbyeshleman@gmail.com>
To:     "Michael S. Tsirkin" <mst@redhat.com>
Cc:     Bobby Eshleman <bobby.eshleman@gmail.com>,
        Bobby Eshleman <bobby.eshleman@bytedance.com>,
        Cong Wang <cong.wang@bytedance.com>,
        Jiang Wang <jiang.wang@bytedance.com>,
        Stefan Hajnoczi <stefanha@redhat.com>,
        Stefano Garzarella <sgarzare@redhat.com>,
        Jason Wang <jasowang@redhat.com>,
        "David S. Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>,
        "K. Y. Srinivasan" <kys@microsoft.com>,
        Haiyang Zhang <haiyangz@microsoft.com>,
        Stephen Hemminger <sthemmin@microsoft.com>,
        Wei Liu <wei.liu@kernel.org>, Dexuan Cui <decui@microsoft.com>,
        kvm@vger.kernel.org, virtualization@lists.linux-foundation.org,
        netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-hyperv@vger.kernel.org
Subject: Re: [PATCH 0/6] virtio/vsock: introduce dgrams, sk_buff, and qdisc
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On Wed, Aug 17, 2022 at 01:53:32PM -0400, Michael S. Tsirkin wrote:
> On Tue, Aug 16, 2022 at 11:08:26AM +0000, Bobby Eshleman wrote:
> > On Wed, Aug 17, 2022 at 01:02:52PM -0400, Michael S. Tsirkin wrote:
> > > On Tue, Aug 16, 2022 at 09:42:51AM +0000, Bobby Eshleman wrote:
> > > > > The basic question to answer then is this: with a net device qdisc
> > > > > etc in the picture, how is this different from virtio net then?
> > > > > Why do you still want to use vsock?
> > > > > 
> > > > 
> > > > When using virtio-net, users looking for inter-VM communication are
> > > > required to setup bridges, TAPs, allocate IP addresses or setup DNS,
> > > > etc... and then finally when you have a network, you can open a socket
> > > > on an IP address and port. This is the configuration that vsock avoids.
> > > > For vsock, we just need a CID and a port, but no network configuration.
> > > 
> > > Surely when you mention DNS you are going overboard? vsock doesn't
> > > remove the need for DNS as much as it does not support it.
> > > 
> > 
> > Oops, s/DNS/dhcp.
> 
> That too.
> 

Sure, setting up dhcp would be overboard for just inter-VM comms.

It is fair to mention that vsock CIDs also need to be managed /
allocated somehow.