netdev - Re: [PATCH v3] vsock.7: add VMADDR_CID

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Message-ID: <20200218095940.vnyva3lknsfsxxs5@steredhat>
Date:   Tue, 18 Feb 2020 10:59:40 +0100
From:   Stefano Garzarella <sgarzare@...hat.com>
To:     Stefan Hajnoczi <stefanha@...hat.com>
Cc:     mtk.manpages@...il.com, linux-man@...r.kernel.org,
        Dexuan Cui <decui@...rosoft.com>,
        Jorgen Hansen <jhansen@...are.com>, netdev@...r.kernel.org
Subject: Re: [PATCH v3] vsock.7: add VMADDR_CID_LOCAL description

On Tue, Feb 18, 2020 at 09:53:19AM +0000, Stefan Hajnoczi wrote:
> On Mon, Feb 17, 2020 at 06:31:21PM +0100, Stefano Garzarella wrote:
> > Linux 5.6 added the new well-known VMADDR_CID_LOCAL for
> > local communication.
> > 
> > This patch explains how to use it and remove the legacy
> > VMADDR_CID_RESERVED no longer available.
> > 
> > Reviewed-by: Jorgen Hansen <jhansen@...are.com>
> > Signed-off-by: Stefano Garzarella <sgarzare@...hat.com>
> > ---
> > v3:
> >     * rephrased "Previous versions" part [Jorgen]
> > v2:
> >     * rephrased "Local communication" description [Stefan]
> >     * added a mention of previous versions that supported
> >       loopback only in the guest [Stefan]
> > ---
> >  man7/vsock.7 | 19 +++++++++++++++++--
> >  1 file changed, 17 insertions(+), 2 deletions(-)
> > 
> > diff --git a/man7/vsock.7 b/man7/vsock.7
> > index c5ffcf07d..219e3505f 100644
> > --- a/man7/vsock.7
> > +++ b/man7/vsock.7
> > @@ -127,8 +127,8 @@ There are several special addresses:
> >  means any address for binding;
> >  .B VMADDR_CID_HYPERVISOR
> >  (0) is reserved for services built into the hypervisor;
> > -.B VMADDR_CID_RESERVED
> > -(1) must not be used;
> > +.B VMADDR_CID_LOCAL
> > +(1) is the well-known address for local communication (loopback);
> >  .B VMADDR_CID_HOST
> >  (2)
> >  is the well-known address of the host.
> > @@ -164,6 +164,16 @@ Consider using
> >  .B VMADDR_CID_ANY
> >  when binding instead of getting the local CID with
> >  .BR IOCTL_VM_SOCKETS_GET_LOCAL_CID .
> > +.SS Local communication
> > +The
> > +.B VMADDR_CID_LOCAL
> > +(1) directs packets to the same host that generated them. This is useful
> 
> Please see my comment on v2.  "The VMADDR_CID_LOCAL (1) directs packets
> ..." sounds unnatural.  Please drop "The".

I received it just now :O but you sent it 4 days ago!
Sorry for that!

I'll send v4 dropping "The".

Thanks,
Stefano