linux-kernel - Re: drivers/net/phy/phy.c issue

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Message-ID: <20120208150548.32643cmtaxtymzok@67.228.131.195>
Date:	Wed, 08 Feb 2012 15:05:48 -0600
From:	guenter@...ck-us.net
To:	"Frans Meulenbroeks" <fransmeulenbroeks@...il.com>
Cc:	guenter.roeck@...csson.com, 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

Quoting "Frans Meulenbroeks" <fransmeulenbroeks@...il.com>:

> 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?
>
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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