[ofa-general] mlx4 second port lro issue

[Boris Shpolyansky]

Dumb question: what was the MTU setting of the eth interface associated
with port 2? Dropping jumbo frames has nothing to do with LRO - it is
plain layer 2 functionality.

Boris Shpolyansky
Sr. Member of Technical Staff, Applications
 
Mellanox Technologies Inc.
350 Oakmead Parkway, Suite 100
Sunnyvale, CA 94085
Tel.: (408) 916 0014
Fax: (408) 585 0314
Cell: (408) 834 9365
www.mellanox.com

-----Original Message-----
From: general-bounces at lists.openfabrics.org
[mailto:general-bounces at lists.openfabrics.org] On Behalf Of Shirley Ma
Sent: Thursday, September 10, 2009 2:10 PM
To: Roland Dreier
Cc: general at lists.openfabrics.org
Subject: Re: [ofa-general] mlx4 second port lro issue

Hello Roland,

On Thu, 2009-09-10 at 13:54 -0700, Roland Dreier wrote:
> haven't seen this.  But I haven't really tried.
> 
> Are you talking about mlx4_en or ipoib with mlx4_ib?  What do you mean
> by lro not working -- the interface doesn't work with lro enabled, or
> you just don't see aggregation of receives?
> 
> By the way, both mlx4_en and ipoib should probably move from lro to
> gro -- patches welcome.

Thanks for your prompt response. The problem was seen on mlx4_en QDR.
When LRO enabled, for large packet than 1500 mtu, port1 can process this
packet, but port2 doesn't see this big packet at all from tcpdump trace.
I wonder whether there is any FW issue since I don't think the driver
handle two ports differently.

Shirley

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