netdev - ixgbe driver fails occasionally since ee98b577e7711d5890ded2c7b05578a29512bd39

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Date:	Thu, 23 Oct 2014 15:06:25 +0100
From:	Scott Harrison <scoharr2@...co.com>
To:	netdev@...r.kernel.org
Subject: ixgbe driver fails occasionally since
 ee98b577e7711d5890ded2c7b05578a29512bd39

Hi,

I was asked to raise this issue here.

https://bugzilla.kernel.org/show_bug.cgi?id=86591

lspci ->

03:00.0 Ethernet controller: Intel Corporation 82599EB 10-Gigabit SFI/SFP+ Network Connection (rev 01)
03:00.1 Ethernet controller: Intel Corporation 82599EB 10-Gigabit SFI/SFP+ Network Connection (rev 01)

With the fibre 10Gbs SFP occasionally on reboot we get

[   15.104726] ixgbe 0000:03:00.0 eth0: detected SFP+: 5                        
[   19.735155] ixgbe 0000:03:00.0 eth0: setup link failed with code -14  

Probably about 1 in 10 boots.  With the 1Gbs Copper SFP it works fine.  
kernel 3.14.8 worked fine, but on upgrading to 3.16.1 it fails in this way.  
I have narrowed it down to the commit

https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/?id=ee98b577e7711d5890ded2c7b05578a29512bd39

I don't know enough about the hardware to understand why the change 
sometimes causes the failure, and was hoping someone else would.  Reverting 
this commit on 3.16.1 fixes the issue.

If you need any more information please ask.

Scott.

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