netdev - D-Link DUB E100 C1 not working when pinged by "ping 172.17.0.1 -c 1 -s 1965"

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Date:	Wed, 17 Apr 2013 12:55:37 +0100
From:	Dean Jenkins <Dean_Jenkins@...tor.com>
To:	netdev@...r.kernel.org
CC:	"David S. Miller" <davem@...emloft.net>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Lucas Stach <dev@...xeye.de>
Subject: D-Link DUB E100 C1 not working when pinged by "ping 172.17.0.1 -c
 1 -s 1965"

Hi,

I think the drivers/net/usb/asix.c drivers is broken for the C1 hardware 
of the D-Link DUB E100 USB Ethernet Adapter.

I setup my ARM target board with D-Link DUB E100 C1 USB Ethernet Adapter 
by using
ifconfig eth0 172.17.0.1

On a Linux PC directly connected via an Ethernet cable to the target I do
ping 172.17.0.1 -c 1 -s 1965

but no response is received by the PC.

The ARM target generates errors such as:
[  202.519377] asix 1-2:1.0: eth0: asix_rx_fixup() Bad Header Length
[  202.525593] asix 1-2:1.0: eth0: asix_rx_fixup() Bad RX Length 1925

Note that this following ping works OK by shortening the length by 1:
ping 172.17.0.1 -c 1 -s 1964

Note that this ping test causes IP fragmentation to be used.

I am using a modified 2.6.34.13 kernel with back-ported changes for the 
ASIX driver.

I note that Linux 3.9-rc7 has an additional change to asix_rx_fixup() 
that looks helpful. I backported that commit 
8b5b6f5413e97c3e8bafcdd67553d508f4f698cd to the ARM now
ping 172.17.0.1 -c 1 -s 1965

gives the following run-time kernel errors on the ARM target and the 
ping does not work
[ 1193.872116] asix 1-2:1.0: eth0: asix_rx_fixup() Bad Header Length 
0xffff2f13, offset 6

It is possible that my back-porting is wrong or I have commits missing.

As the ping test is simple, please can anyone with a D-Link DUB E100 C1 
USB Ethernet Adapter run my ping test on any platform to see whether any 
Linux version has a working ASIX driver for this C1 hardware.

I note that the ASIX driver split into multiple files in Linux 3.6 which 
complicates back-porting.

Thanks for any observations of a working ASIX driver for this C1 
hardware variant using my ping test.

Regards,
Dean Jenkins
Mentor Graphics
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