Alignment issues with freescale FEC driver

[Eric Nelson]

Thanks Russell,

On 09/23/2016 11:30 AM, Russell King - ARM Linux wrote:
> On Fri, Sep 23, 2016 at 08:13:01PM +0200, Andrew Lunn wrote:
>>> Since the hardware requires longword alignment for its' DMA transfers,
>>> aligning the IP header will require a memcpy, right?
>>
>> The vf610 FEC has an SHIFT16 bit in register ENETx_TACC, which inserts
>> two padding bits on transmit. ENETx_RACC has the same.
>>
>> What about your hardware?
> 
> The iMX6 FEC also has that ability - as part of my FEC patch stack from
> ages ago, I implemented support for it.
> 
>   "net:fec: implement almost zero-copy receive path"
> 
> in my public fec-testing branch.
> 
> That patch stack is sadly now totally dead and I've no interest in
> reviving it myself.  There was some interest from others in taking my
> patch stack over, but that went quiet.
> 

I'll take a look and hopefully revive at least part of the patch set.