> As my below test on ax99179_178a, I believe the patch should fix padding
> for dma sg, but need a little update, and I will send out v1 later:
>
> $ping -s 974 another_machine #from host with ax99179_178a attached
>
> If FLAG_SEND_ZLP is set for ax99179_178a, the above ping won't work any
> more either on USB3.0 or USB 2.0 host controller.
>
> So don't assume that these brand new devices can support ZLP well.
I've just posted a fix to the xhci driver to implement URB_ZERO_PACKET.
With that fix (and ZLP enabled in the ax88179_178a driver) the above
ping works fine (ax88179 Ge card on USB3).
I wonder how many other usb drivers fail to support URB_ZERO_PACKET.
Maybe the driver should pass a flag to its users (along with SG support).
I've also posted (to linux-usb) another fix to the xhci driver that is
needed to get SG (and one that cross 64k boundaries) transfers working.
David
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