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

[Jesse Gross]

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.
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