lkml.org 
[lkml]   [2015]   [May]   [31]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [PATCH 1/1] net: core: 'ethtool' issue with querying phy settings
From
From: Ben Hutchings <ben@decadent.org.uk>
Date: Sun, 31 May 2015 20:54:06 +0100

> On Fri, 2015-05-22 at 16:15 -0400, David Miller wrote:
>> From: Arun Parameswaran <aparames@broadcom.com>
>> Date: Wed, 20 May 2015 14:35:30 -0700
>>
>> > When trying to configure the settings for PHY1, using commands
>> > like 'ethtool -s eth0 phyad 1 speed 100', the 'ethtool' seems to
>> > modify other settings apart from the speed of the PHY1, in the
>> > above case.
>> >
>> > The ethtool seems to query the settings for PHY0, and use this
>> > as the base to apply the new settings to the PHY1. This is
>> > causing the other settings of the PHY 1 to be wrongly
>> > configured.
>> >
>> > The issue is caused by the '_ethtool_get_settings()' API, which
>> > gets called because of the 'ETHTOOL_GSET' command, is clearing
>> > the 'cmd' pointer (of type 'struct ethtool_cmd') by calling
>> > memset. This clears all the parameters (if any) passed for the
>> > 'ETHTOOL_GSET' cmd. So the driver's callback is always invoked
>> > with 'cmd->phy_address' as '0'.
>> >
>> > The '_ethtool_get_settings()' is called from other files in the
>> > 'net/core'. So the fix is applied to the 'ethtool_get_settings()'
>> > which is only called in the context of the 'ethtool'.
>> >
>> > Signed-off-by: Arun Parameswaran <aparames@broadcom.com>
>> > Reviewed-by: Ray Jui <rjui@broadcom.com>
>> > Reviewed-by: Scott Branden <sbranden@broadcom.com>
>>
>> Applied and queued up for -stable, thanks.
>
> Please revert this. This is an incompatible API change, not a bug fix.
> The established semantics are that 'phyad' is filled in by the driver;
> it is not a parameter to the ETHTOOL_GSET command.

But then how in the world can the user specify specific PHY ADs for
a device that will respond to more than one?


\
 
 \ /
  Last update: 2015-06-01 03:01    [W:0.085 / U:0.268 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site