Re: please test: ethernet media-handling patch

[David Young <dyoung%pobox.com@localhost>]

On Thu, Jan 10, 2008 at 12:04:00PM -0500, Perry E. Metzger wrote:
> 
> David Young <dyoung%pobox.com@localhost> writes:
> > nfe(4), aue(4), axe(4), udav(4), url(4): do not reset all PHYs
> >         on a change of media
> 
> So if I unplug a cable from a 100M network and put it into a 1G
> network, it won't reset and renegotiate? (Forgive me if I don't
> understand this properly.)

If the operator changes the media settings, then the NIC driver will call
ether_mediachange() -> mii_mediachg() -> (for each PHY) phy_service(,,
MII_MEDIACHG).  A PHY service routine will reset and isolate its PHY
if it is no longer selected.  If the PHY is selected, then the service
routine will either program the media type (e.g., IFM_ETHER|IFM_100_TX),
or begin auto-negotiation (IFM_AUTO).

Dave

-- 
David Young             OJC Technologies
dyoung%ojctech.com@localhost      Urbana, IL * (217) 278-3933 ext 24