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Re: [PATCH v7 05/12] vhost_net: Add NetClientInfo prepare callback


From: Eugenio Perez Martin
Subject: Re: [PATCH v7 05/12] vhost_net: Add NetClientInfo prepare callback
Date: Tue, 9 Aug 2022 09:34:31 +0200

On Tue, Aug 9, 2022 at 8:54 AM Jason Wang <jasowang@redhat.com> wrote:
>
> On Fri, Aug 5, 2022 at 2:29 AM Eugenio Pérez <eperezma@redhat.com> wrote:
> >
> > This is used by the backend to perform actions before the device is
> > started.
> >
> > In particular, vdpa net use it to map CVQ buffers to the device, so it
> > can send control commands using them.
> >
> > Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
> > ---
> >  include/net/net.h  | 2 ++
> >  hw/net/vhost_net.c | 7 +++++++
> >  2 files changed, 9 insertions(+)
> >
> > diff --git a/include/net/net.h b/include/net/net.h
> > index 523136c7ac..3416bb3d46 100644
> > --- a/include/net/net.h
> > +++ b/include/net/net.h
> > @@ -44,6 +44,7 @@ typedef struct NICConf {
> >
> >  typedef void (NetPoll)(NetClientState *, bool enable);
> >  typedef bool (NetCanReceive)(NetClientState *);
> > +typedef int (NetPrepare)(NetClientState *);
> >  typedef ssize_t (NetReceive)(NetClientState *, const uint8_t *, size_t);
> >  typedef ssize_t (NetReceiveIOV)(NetClientState *, const struct iovec *, 
> > int);
> >  typedef void (NetCleanup) (NetClientState *);
> > @@ -71,6 +72,7 @@ typedef struct NetClientInfo {
> >      NetReceive *receive_raw;
> >      NetReceiveIOV *receive_iov;
> >      NetCanReceive *can_receive;
> > +    NetPrepare *prepare;
>
> So it looks to me the function is paired with a stop that is
> introduced in the following patch.
>
> Maybe we should use "start/stop" instead of "prepare/stop"?
>

Sure, I can prepare the next series with it.

Thanks!

> Thanks
>
> >      NetCleanup *cleanup;
> >      LinkStatusChanged *link_status_changed;
> >      QueryRxFilter *query_rx_filter;
> > diff --git a/hw/net/vhost_net.c b/hw/net/vhost_net.c
> > index ccac5b7a64..e1150d7532 100644
> > --- a/hw/net/vhost_net.c
> > +++ b/hw/net/vhost_net.c
> > @@ -244,6 +244,13 @@ static int vhost_net_start_one(struct vhost_net *net,
> >      struct vhost_vring_file file = { };
> >      int r;
> >
> > +    if (net->nc->info->prepare) {
> > +        r = net->nc->info->prepare(net->nc);
> > +        if (r < 0) {
> > +            return r;
> > +        }
> > +    }
> > +
> >      r = vhost_dev_enable_notifiers(&net->dev, dev);
> >      if (r < 0) {
> >          goto fail_notifiers;
> > --
> > 2.31.1
> >
>




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