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

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Message-ID: <CACW_hTbLd3kbuwJy9U2ZGDi3ypD-+KsecjYhku7jwQgFPaRqhg@mail.gmail.com>
Date:	Wed, 8 Feb 2012 21:00:27 +0100
From:	Frans Meulenbroeks <fransmeulenbroeks@...il.com>
To:	guenter.roeck@...csson.com
Cc:	netdev@...r.kernel.org,
	"afleming@...escale.com" <afleming@...escale.com>,
	"macro@...ux-mips.org" <macro@...ux-mips.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: drivers/net/phy/phy.c issue

2012/2/8 Guenter Roeck <guenter.roeck@...csson.com>:
> 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?

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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