[U-Boot] [PATCH] net: asix: don't pad odd-length TX packets

[Marek Vasut <marex@denx.de>]

On Monday, March 03, 2014 at 03:14:34 PM, Gerhard Sittig wrote:
> On Fri, Feb 28, 2014 at 11:54 +0100, Marek Vasut wrote:
> > On Thursday, February 27, 2014 at 09:38:48 PM, Simon Glass wrote:
> > > Hi Stephen,
> > > 
> > > On 27 February 2014 13:27, Stephen Warren <swarren@wwwdotorg.org> wrote:
> > > > From: Stephen Warren <swarren@nvidia.com>
> > > > 
> > > > For Ethernet/USB RX packets, the ASIX HW pads odd-sized packets so
> > > > that they have an even size. Currently, asix_recv() does remove this
> > > > padding, and asic_send() adds equivalent padding in the TX path.
> > > > However, the HW does not appear to need this packing for TX packets
> > > > in practical testing with "ASIX Elec. Corp. AX88x72A 000001" Vendor:
> > > > 0x0b95 Product 0x7720 Version 0.1. The Linux kernel does no such
> > > > padding for the TX path.
> > > > 
> > > > Remove the padding from the TX path:
> > > > 
> > > > * For consistency with the Linux kernel.
> > > > * NVIDIA has a Tegra simulator which validates that the length of USB
> > > > 
> > > >   packets sent to an ASIX device matches the packet length value
> > > >   inside the packet data. Having U-Boot and the kernel do the same
> > > >   thing when creating the TX packets simplifies the simulator's
> > > >   validation.
> > > > 
> > > > Cc: Lucas Stach <dev@lynxeye.de>
> > > > Cc: Marek Vasut <marex@denx.de>
> > > > Cc: Simon Glass <sjg@chromium.org>
> > > > Signed-off-by: Stephen Warren <swarren@nvidia.com>
> > > 
> > > My notes indicate I added this due to a problem I had at the time with
> > > bootp. However, since you have tested it, perhaps the root cause was
> > > somewhere else.
> > > 
> > > Acked-by: Simon Glass <sjg@chromium.org>
> > 
> > Tested on two different ASIX dongles:
> > 
> > 0x2001:0x3c05 ; DUB-E100 ; D-Link Corporation
> > 0x0b95:0x7720 ; ZoWii ; Zoltan Tech
> > 
> > Acked-by: Marek Vasut <marex@denx.de>
> > Tested-by: Marek Vasut <marex@denx.de>
> 
> Tested with TFTP over a "Logilink UA0144" dongle ('usb info' says
> "ASIX Elec. Corp. AX88772B 000001", vendor 0x0b95, prod 0x772b)
> and "Edimax EU-4208" ("ASIX Elec. Corp. AX88772B 0E62D5", 0x0b95,
> 0x772b).
> 
> Tested-by: Gerhard Sittig <gsi@denx.de>

Putting Joe back on CC. Joe, can you please pick this one ?

Thanks!

Best regards,
Marek Vasut