[ofa-general] [PATCH 13 of 17]: add LRO support

[Eli Cohen]

> Hi Eli,
> 
> Back on April a user having the configuration
> 
> A --- 10g --- B --- IB --- C
> 
> where node B acts as an IP router having one 10g interface
> and one IB interface reported on a sever bandwidth problem
> which was resolved to be related to the 10g driver have LRO mechanism 
> which is not operative under forwarding scheme, see the email/thread 
> http://lists.openfabrics.org/pipermail/general/2007-April/035322.html
> 
> My question is, does the suggested LRO code need to be disabled when the 
> node does forwarding?
> 
I did not test such a setup with a host operating as a router between
ipoib and Ethernet networks. Once I do this I will evaluate if there is
a problem and possibly add facilities to disable LRO (probably via
ethtool).

> Indeed you have removed the LSO, LRO patches from the stateless offload 
> patch set posting to the upstream kernel, but they do exist in OFED 1.3
> 
> Tziporet - I am quite worried from distributing with OFED 1.3 ipoib 
> changes (namely LSO and LRO support) which were never reviewed by the 
> community and that I understand are not planned for review towards 2.6.24.
> 
> What is your thinking on the matter?
> 
> Or.
> 
> > -----Original Message-----
> > From: general-bounces at lists.openfabrics.org On Behalf Of David Miller
> > Sent: Saturday, April 28, 2007 2:40 AM
> > To: rick.jones2 at hp.com
> > Cc: lawver1 at llnl.gov; netdev at vger.kernel.org; mst at dev.mellanox.co.il; general at lists.openfabrics.org
> > Subject: Re: [ofa-general] Re: IPoIB forwarding
> > 
> > From: Rick Jones <rick.jones2 at hp.com>
> > Date: Fri, 27 Apr 2007 16:37:49 -0700
> > 
> >> Large Receive Offload (LRO) is enabled by default.  This will 
> >> interfere with forwarding TCP traffic.  If you plan to forward TCP 
> >> traffic (using the host with the Myri10GE NIC as a router or bridge), 
> >> you must disable LRO.  To disable LRO, load the myri10ge driver with 
> >> myri10ge_lro set to 0:
> > 
> > LRO should be disabled by default if the driver does this.  This is a major and unacceptable bug.
> > 
> > Thanks for pointing this out Rick.
> 
> 
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