lkml.org 
[lkml]   [2006]   [May]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [Xen-devel] [RFC PATCH 34/35] Add the Xen virtual network device driver.
On Tue, May 09, 2006 at 09:55:33PM +1000, Herbert Xu wrote:
> Hi Chris:
>
> Chris Wright <chrisw@sous-sol.org> wrote:
> >
> > +/** Send a packet on a net device to encourage switches to learn the
> > + * MAC. We send a fake ARP request.
> > + *
> > + * @param dev device
> > + * @return 0 on success, error code otherwise
> > + */
> > +static int send_fake_arp(struct net_device *dev)
>
> I think we talked about this before. I don't see why Xen is so special
> that it needs its own gratuitous arp routine embedded in the driver.
> If this is needed at all (presumably for migration) then it should be
> performed by the management scripts which can send grat ARP packets just
> as easily.

There's at least two reasons why having it in the driver is preferable:
- synchronizing sending the fake ARP request with when the device is
operational -- you really want to make this well synchronized to keep
unreachability as short as possible, especially when doing live
migration
- anybody but the guest might not know (all) the MAC addresses for which
to send a fake ARP request

christian

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2006-05-09 14:46    [from the cache]
©2003-2011 Jasper Spaans