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Date:	Wed, 18 Jan 2012 14:43:22 -0800
From:	Ben Greear <>
To:	Jesper Dangaard Brouer <>
CC:	Benny Amorsen <>,
	Jesse Brandeburg <>,
	"Skidmore, Donald C" <>,
	"Waskiewicz Jr, Peter P" <>,
	"" <>,
	"Kirsher, Jeffrey T" <>
Subject: Re: ixgbe: Unsupported SFP+ modules on 10Gbit/s X520-DA2 NIC?

On 01/18/2012 02:19 PM, Jesper Dangaard Brouer wrote:
> On Wed, 2012-01-18 at 22:45 +0100, Benny Amorsen wrote:
>> Jesse Brandeburg<>  writes:
>>> For X520 adapters, the documentation[1] states that which SFP+
>>> adapters are/are not supported.  Direct attach cables are also
>>> supported.
>>> [1]
>> I can't believe that locked optics have now arrived on commodity
>> hardware. I have been trying to migrate to all-Intel networking at work;
>> that effort is certainly on hold now.
> I cannot understand why Intel are pulling a stunt like this! :-(
> I have read the code, and the limitation comes from a EEPROM setting on
> the NIC, see define "IXGBE_DEVICE_CAPS_ALLOW_ANY_SFP 0x1".
> Here is a (untested) patch I believe removes the limitation in the
> driver:
> [PATCH] ixgbe: Always allow any SFP+ regardless of EEPROM setting.
> Intel are trying to limit which SFP's we can use in our NICs.
> We don't like this practices in the Linux Kernel.

I think that you should at least print some big warnings in
the kernel logs if you do this, as well as all the info you
can find on the non-supported SFP+ module in use so that folks can debug
things if the SFP+ doesn't properly work.

As previously mentioned, I found a case where some random SFP+
did NOT work with a similar hack in place...


Ben Greear <>
Candela Technologies Inc
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