Re: [Qemu-devel] [PATCH 6/7] vhost-user: add multiple queue support

[Yuanhan Liu]

On Tue, Sep 08, 2015 at 03:22:30PM -0600, Eric Blake wrote:
> On 09/08/2015 01:38 AM, Yuanhan Liu wrote:
> > From: Ouyang Changchun <address@hidden>
> > 
> > This patch is initially based a patch from Nikolay Nikolaev.
> > 
> > Here is the latest version for adding vhost-user multiple queue support,
> > by creating a nc and vhost_net pair for each queue.
> > 
> 
> Reviewing grammar and interface only:

Thanks, and will fix them in next patch.

        --yliu
> 
> > +++ b/docs/specs/vhost-user.txt
> > @@ -135,6 +135,19 @@ As older slaves don't support negotiating protocol 
> > features,
> >  a feature bit was dedicated for this purpose:
> >  #define VHOST_USER_F_PROTOCOL_FEATURES 30
> >  
> > +Multiple queue support
> > +-------------------
> > +Multiple queue is treated as a protocal extension, hence the slave has to
> 
> s/protocal/protocol/
> 
> > +implement protocol features first. Multiple queues is supported only when
> > +the protocol feature VHOST_USER_PROTOCOL_F_MQ(bit 0) is set.
> > +
> > +The max # of queues the slave support can be queried with message
> 
> s/#/number/
> s/support/supports/
> 
> > +VHOST_USER_GET_PROTOCOL_FEATURES. Master should stop when the # of 
> > requested
> 
> s/#/number/
> 
> > +queues is bigger than that.
> > +
> > +As all queues share one connection, the master use a unique index for each
> 
> s/use/uses/
> 
> > +queue in the sent message to identify one specified queue.
> > +
> 
> > +++ b/qapi-schema.json
> > @@ -2480,12 +2480,16 @@
> >  #
> >  # @vhostforce: #optional vhost on for non-MSIX virtio guests (default: 
> > false).
> >  #
> > +# @queues: #optional number of queues to be created for multiqueue 
> > vhost-user
> > +#          (default: 1) (Since 2.5)
> > +#
> >  # Since 2.1
> >  ##
> >  { 'struct': 'NetdevVhostUserOptions',
> >    'data': {
> >      'chardev':        'str',
> > -    '*vhostforce':    'bool' } }
> > +    '*vhostforce':    'bool',
> > +    '*queues':        'int' } }
> 
> Looks okay.
> 
> -- 
> Eric Blake   eblake redhat com    +1-919-301-3266
> Libvirt virtualization library http://libvirt.org
>