[U-Boot] [PATCH 1/2] net: designware: fix tx packet length

[Philipp Tomsich]

> On 17.11.2018, at 10:24, Simon Goldschmidt <simon.k.r.goldschmidt at gmail.com> wrote:
> 
> The designware driver has a bug in setting the tx length into the dma
> descriptor: it always or's the length into the descriptor without
> zeroing out the length mask before.
> 
> This results in occasional packets being transmitted with a length
> greater than they should be (trailer). Due to the nature of Ethernet
> allowing such a trailer, most packets seem to be parsed fine by remote
> hosts, which is probably why this hasn't been noticed.
> 
> Fix this by correctly clearing the size mask before setting the new
> length.
> 
> Tested on socfpga gen5.
> 
> Signed-off-by: Simon Goldschmidt <simon.k.r.goldschmidt at gmail.com>

Reviewed-by: Philipp Tomsich <philipp.tomsich at theobroma-systems.com>