Re: [Xen-devel] xen-netback notify DomU to send ARP.

[Jason Luan <luanjianhai@xxxxxxx>]

ä 2013å01æ09æ 21:44, Jan Beulich åé:
> > > > On 09.01.13 at 13:28, jianhai luan <jianhai.luan@xxxxxxxxxx> wrote:
> > > > +       switch (event) {
> > > > +       case NETDEV_NOTIFY_PEERS:
> > > > +               /* Notify frontend to Send gratuitous ARP */
> > > > +               xenbus_switch_state(be->dev, XenbusStateInitialised);
> > > > +               xenbus_switch_state(be->dev, );
> > > This is the sort of change that clearly isn't acceptable, as I don't
> > > think you have ways to check _all_ existing frontends for their
> > > compatibility with this. A connected -> connected transition
> > > might be acceptable (that was done in the block frontend too, for
> > > implementing dynamic resize), but will likely need to be
> > > accompanied by a frontend side patch to handle that (which so
> > > far should be a no-op).
> > The latest xen net-frontent driver have handled the condition. State
> > XenbusStateInitialised will do nothing,
> > but change to XenbusStateConnected will trigger
> > netdev_notify_peers(netdev) to send ARP.
> Did you read my earlier reply carefully? You still only talk about
> (upstream) Linux netfront, but this is not the only (possible)
> frontend. You should not invoke state transitions that can -
> even if only theoretically - blow up frontends. And afaict the
I only want to notify xen-netfront. I don't know what is better way?
To attainthegoal, i try to modify virtual interrupt, but the way is
morecomplicated,modified and working. So, i give up the way.
Would you like to give some suggestion about how to notify xen-netfront?
> only thing you can safely assume frontends ought to tolerate
> are transitions from Connected to Connected (or more
> generally from one state to the same one, but the other
> states aren't useful here, except maybe the Reconfigur* ones).
Sorry for that. At the beginning the patch be applied in kernel 2.6.18 to
fixed one issue. Only XenbusStateInitialised and XenbusStateClosed ( Not
Reconfigure* one) don't any thing, so i choose the XenbusStateInitialised.
Do you suggestion that i choose Reconfigure*?
> Jan
>
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@xxxxxxxxxxxxx
> http://lists.xen.org/xen-devel


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel