[ovs-dev] [PATCH] vswitchd: Treat gratuitous ARP requests like gratuitous ARP replies.

Ben Pfaff blp at nicira.com
Wed May 26 21:20:44 UTC 2010


On Wed, May 26, 2010 at 02:14:43PM -0700, Jesse Gross wrote:
> On Wed, May 26, 2010 at 1:12 PM, Ben Pfaff <blp at nicira.com> wrote:
> 
> > vswitchd has long used a gratuitous ARP reply as an indication that a VM
> > has migrated, because Citrix-patch Linux DomUs send such packets out when
> > they complete migration.  Relatively recently, however, we realized that
> > upstream Linux does not do this.  Ian Campbell submitted a patch to the
> > Linux network maintainer, Dave Miller, to fix this, but Dave did not accept
> > it in its original form.  Instead, he required the form of the packet to
> > change to a gratuitous ARP request.  Until now, ovs-vswitchd had no reason
> > to treat these specially, but now that Linux will be using them, we should
> > also treat them as an indication that a VM has migrated.  This commit does
> > so.
> >
> > See http://marc.info/?l=linux-netdev&m=127367215620212&w=2 for Ian's
> > original patch and http://marc.info/?l=linux-netdev&m=127468303701361&w=2
> > for Dave Miller's response.
> >
> > CC: Ian Campbell <Ian.Campbell at citrix.com>
> > NIC-74.
> >
> 
> Looks good to me.

Thanks.

Ian, can I get either ACK or a correction from you on my explanation of
the situation?




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