Re: drivers/net/phy/phy.c issue

[guenter]

Quoting "Frans Meulenbroeks" <fransmeulenbroeks@xxxxxxxxx>:

> 2012/2/8 Guenter Roeck <guenter.roeck@xxxxxxxxxxxx>:
> > Copying netdev.
> >
> > On Wed, 2012-02-08 at 09:31 -0500, Frans Meulenbroeks wrote:
> > > Hi
> > >
> > > I found an issue with drivers/net/phy/phy.c
> > > As I could not identify a maintainer for this file I decided to mail
> > > it to the above addressees.
> > > Apologies upfront if it is inappropriate.
> > >
> > > The issue:
> > >
> > > My network interface was configured as 10Mbit, full duplex,   
> > > autonegotiate off.
> > > If the cable is unplugged after 10 seconds or so the interface drops
> > > to half duplex and the message:
> > > Trying 10/HALF
> > > is printed. This message comes (if I am correct from the function
> > > phy_force_reduction in drivers/net/phy/phy.c
> > >
> > > Maybe this is still ok, however if I reconnect my network cable the
> > > interface remains configured as 10 Mbit, half duplex.
> > > I had expected/assumed that it would go back to 10 Mbit, full duplex.
> > >
> > > If I try the same with a 1Gbit full duplex link with autonegotiate on,
> > > the link also drops to half duplex whenever the cable is
> > > disconnected. However reconnecting the cable then brings the interface
> > > back to full duplex again.
> > >
> > > Not sure what is wrong (if the interface should not be dropped to half
> > > or get back to full) and even less an idea how to fix it,
> > > but wanted to report it anyway, in the hope someone can shed a light
> > > on this and/or fix it.
> > What is your kernel version ? No idea if it makes a difference, but I
> > strongly suspect people will need to know.
>
> Oops, sorry for the incomplete info.
> This was detected in 2.6.38, but the current git head of phy.c differs
> only on a few places that (at least according to my judgement) are not
> related.
> Apologies, but I cannot test on a git head kernel.
>
> And wrt the question of Andy in the subsequent reply.
>
> Hw is a Freescale MPC8313. This is a Gianfar. Is that the info you wanted?
This is the MAC. Andy was asking for the PHY chip.

Guenter

> BTW what is the desired behaviour? Should I drop to half duplex? Or
> should I get back to full if I reconnect.
>
> Best regards, Frans
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