netdev - Re: Should we report bus width/speed via ethtool?

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Message-Id: <20121205.190121.1400827550469329286.davem@davemloft.net>
Date:	Wed, 05 Dec 2012 19:01:21 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	greearb@...delatech.com
Cc:	netdev@...r.kernel.org, e1000-devel@...ts.sourceforge.net
Subject: Re: Should we report bus width/speed via ethtool?

From: Ben Greear <greearb@...delatech.com>
Date: Wed, 05 Dec 2012 15:09:11 -0800

> On 12/05/2012 02:36 PM, David Miller wrote:
>> From: Ben Greear <greearb@...delatech.com>
>> Date: Wed, 05 Dec 2012 13:35:01 -0800
>>
>>> It seems the only way to get the current pci-e bus speed & width
>>> in ixgbe (and probably many other NICs) is by parsing output
>>> of lspci -vvv.
>>>
>>> I'd personally find it easier if this info were available via
>>> ethtool API.
>>
>> You could just as easily have ethtool determine the PCI device
>> location (using existing facilities) and fetch the PCI-e info from the
>> PCI sysfs files.
> 
> Any particular sysfs file?  I've been grubbing around in there
> and I don't see anything that specifies bus width or speed..
> 
> Maybe it's some binary blob that needs decoding?

lspci might be a good place to figure this out :-)  It's probably
grovelling around in PCI config space to determine these things.
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