netdev - SMSC LAN9512 PowerPC Linux Driver Problem

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Date:	Tue, 9 Oct 2012 11:01:34 +0000
From:	José Alexandre Ventura <jose.ventura@...cec.com>
To:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:	Aníbal Almeida Pinto <anibal.pinto@...cec.com>,
	José Alexandre Ventura <jose.ventura@...cec.com>
Subject: SMSC LAN9512 PowerPC Linux Driver Problem

Hi,

I'm having problems with an SMSC EVB9512, based on the LAN9512 chip, when using with a PowerPC Chip. The Driver I'm using is the one already provided by Linux.
I have tested the EVB9512 in two test configurations, both using a PowerPC:

First Test Configuration:
- Custom Board with PowerPC Fresscale MPC8378  @ 667MHz
- Linux Kernel 3.0.0
- EVB9512 connected via USB

Problems with First Test Configuration:
- nmap reports ports has filtered, even thought they are open
- can't establish any connection, even a TCP socket
- can ping the Board with other Devices without a problem

I have made more tests and found out that even though I can receive and send packages, my TX packages had incorrect TCP checksum.
I then used ethtool to disable TX Checksum offloading and all my problems were solved. The problem with this 'fix' is that it uses more CPU and when under heavy load, I get an error and the ethernet port is shut.

Second Configuration:
- PowerBook G4 1.5GHz, 1.25MB DDR333
- Ubuntu Live CD 12.04 LTS
- EVB9512 connected via USB

Problems with second Configuration:
- TX packets appears as errors in ifconfig
- The powerbook is pinged from another machine without a problem but the PowerBook can't ping the other device

I have also tested the EVB9512 with a Custom Card with an OMAP L138 and also tested with a Toshiba Notebook with an Intel Core i5, both without any problems. This shows that it is not a problem with the EVB9512 itself because it works correctly with other architectures. I think the problems lies in the PowerPC driver of the LAN95xx.

Best Regards,
José Ventura

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