Apparent fxp regression in FreeBSD 8.4-RC3

[Jeremy Chadwick]

On Fri, May 24, 2013 at 02:47:20PM +0900, YongHyeon PYUN wrote:
> On Thu, May 23, 2013 at 09:49:19PM -0700, Jeremy Chadwick wrote:
> > On Thu, May 23, 2013 at 09:40:35PM -0700, Jeremy Chadwick wrote:
> > > On Thu, May 23, 2013 at 11:42:44PM -0400, Glen Barber wrote:
> > > > On Thu, May 23, 2013 at 08:38:06PM -0700, Jeremy Chadwick wrote:
> > > > > If someone wants me to test DHCP via fxp(4) on the above system (I can
> > > > > do so with both NICs), just let me know; it should only take me half an
> > > > > hour or so.
> > > > > 
> > > > > I'll politely wait for someone to say "please do so" else won't bother.
> > > > > 
> > > > 
> > > > For the sake of completeness...
> > > > 
> > > > "Please do so."  :)
> > > 
> > > Issue reproduced 100% reliably, even within sysinstall.
> > >
> > > {snip} 
> > 
> > Forgot to add:
> > 
> > This issue ONLY happens when using DHCP.
> > 
> > Statically assigning the IP address works fine; fxp0 goes down once,
> > up once, then stays up indefinitely.
> 
> I asked Mike to try backing out dhclient(8) change(r247336) but it
> seems he missed that. Jeremy, could you try that?
> 
> I guess dhclient(8) does not like flow-control negotiation of
> fxp(4) after link establishment.

I can't test anything without an ISO -- the system in question is truly
"bare-bones" (no hard disk, can't boot USB memsticks, etc.).  I'm not a
good test subject for changes on this one, I'm sorry to say.  :-(

If there's some way to disable flow-control negotiation in fxp(4) or
miibus(4) via loader, I can try that, but I don't know what the MIB
name would be.

<ignore me, I'm just pissed off>
If r247336 turns out to be the cause: ironic, as r247336 references PR
166656, which was tested against -- wait for it -- xl(4).

People in *this* thread are saying "screw legacy hardware" yet the PR is
for something as old as the 3C905B?  Maybe I should bow out of this
thread before I have an aneurysm.
</ignore>

-- 
| Jeremy Chadwick                                   jdc at koitsu.org |
| UNIX Systems Administrator                http://jdc.koitsu.org/ |
| Mountain View, CA, US                                            |
| Making life hard for others since 1977.             PGP 4BD6C0CB |