Small patch to multicast code...
jhay at meraka.org.za
Mon Aug 25 19:40:40 UTC 2008
On Mon, Aug 25, 2008 at 09:02:07PM +0200, John Hay wrote:
> On Fri, Aug 22, 2008 at 03:03:30PM -0700, gnn at FreeBSD.org wrote:
> > At Fri, 22 Aug 2008 22:43:39 +0100,
> > Bruce M. Simpson wrote:
> > >
> > > gnn at FreeBSD.org wrote:
> > > > Somehow the data that the device needs to do the proper checksum
> > > > offload is getting trashed here. Now, since it's clear we need a
> > > > writable packet structure so that we don't trash the original, I'm
> > > > wondering if the m_pullup() will be sufficient.
> > > >
> > >
> > > If it's serious enough to break UDP checksumming on the wire, perhaps we
> > > should just swallow the mbuf allocator heap churn and do the m_dup() for
> > > now, but slap in a big comment about why it's there.
> > I think if none of us finds a better way before early next week that's
> > what I'll do so that this at least works in 7.1.
> I think we and others have been hitting this problem:
> kern/119635: [em] Bad UDP packet checksum with em(4) and rxcsum/txcsum enabled
> I'll try out your patch.
I have tried it and it does fix my problem. RIP2 over multicast works
John Hay -- John.Hay at meraka.csir.co.za / jhay at FreeBSD.org
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