On Wed, 5 Feb 2014, Sarah Sharp wrote: > On Wed, Feb 05, 2014 at 11:58:12AM +0000, David Laight wrote: > > The problem is that the ax88179_178a driver submits receive URBs that > > cross 64k boundaries, and are not aligned (they start at an 0x40 boundary). > > Receive USB frames can contain multiple ethernet frames, by default they > > are 20kB (and sit in 24kB of memory). > > Perhaps you should add printks when a TRB is split on 64KB boundaries > and see if the device drops packets around that time? This seems kind of puzzling. In theory, any URB that's more than 1 byte long can cross a 64-KB boundary. I don't understand why this should cause problems for xhci-hcd. Sure, the transfer has to be split into multiple TDs where the boundary crossing occurs. But why would that be problematic? Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
