linux-kernel - Re: Intel e1000 ethernet device, change in kernel v3.4, and jumbo frames setting DENIED.

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Message-ID: <jt4rfk$enl$1@snarked.org>
Date:	Thu, 5 Jul 2012 12:55:31 -0700
From:	"D. Stussy" <spam+newsgroups@...-arc.ampr.org>
To:	linux-kernel@...r.kernel.org
Subject: Re: Intel e1000 ethernet device, change in kernel v3.4, and jumbo  frames setting DENIED.

"Henrique de Moraes Holschuh"  wrote in message 
news:jjGoO-7l0-19@...ed-at.bofh.it...

On Wed, 04 Jul 2012, D. Stussy wrote:
> There has been some changes to the driver such that things like
> checksum verification is offloaded from the CPU.  However, this
> blocks the ability to set a jumbo frame.  The kernel does record an
> error indicating that checksum offloading need be disabled fro jumbo
> frame MTU sizes to be used.  My e1000 interfaces use the 82574L
> chipset.
>
> 1)  Was this an intentional change?

Yes, but I understand Intel is trying to come up with a way not to need it.

> 2)  How do I disable that function so I can set jumbo frames with
> "ifconfig" or "ip"?  I simply don't know what setting I need to
> pass.

ethtool can do it.  Check its manpage, it can manipulate the various NIC
offload engines, as well as other parameters such as dma ring buffer size,
etc.
=====================
I'll look into it.  Thanks. 

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