Subject: Re: [PATCH] igb: allow tx of pre-formatted vlan tagged packets

From: Stephen Hemminger <[email-masked]>
Date: Thu, 12 Mar 2009 14:22:18 -0700

On Thu, 12 Mar 2009 14:00:57 -0700
Arthur Jones <[email-masked]> wrote:

> Hi Stephen, ...
> 
> On Thu, Mar 12, 2009 at 01:51:19PM -0700, Stephen Hemminger wrote:
> > On Thu, 12 Mar 2009 13:27:24 -0700
> > Arthur Jones <[email-masked]> wrote:
> > 
> > > When the 82575 is fed 802.1q packets, it chokes with
> > > an error of the form:
> > > 
> > > igb 0000:08:00.1: partial checksum but proto=81
> > > 
> > > As the logic there was not smart enough to look into
> > > the vlan header to pick out the encapsulated protocol.
> > > 
> > > There are times when we'd like to send these packets
> > > out without having to configure a vlan on the interface.
> > > Here we check for the vlan tag and allow the packet to
> > > go out with the correct hardware checksum.
> > > 
> > > Thanks to Kand Ly <[email-masked]> for discovering the
> > > issue and the coming up with a solution.  This patch is
> > > based upon his work.
> > > 
> > > Signed-off-by: Arthur Jones <[email-masked]>
> > > ---
> > >  drivers/net/igb/igb_main.c |   12 +++++++++++-
> > >  1 files changed, 11 insertions(+), 1 deletions(-)
> > 
> > That code in current igb driver (net-next-2.6) tree no longer has
> > the whole switch you are changing.
> 
> Ok, thanks, I'll test that one...
> 
> Arthur

Actually, it is there just a little furthur down than I was looking