On Thu, 2013-07-25 at 22:52 +0800, Ming Lei wrote: [...] > On Thu, Jul 25, 2013 at 9:34 PM, Ben Hutchings > <bhutchings@xxxxxxxxxxxxxx> wrote: > > > > Not that I have any experience with USB drivers, but perhaps > > usb_sg_init()? > > USB SG library doesn't support submitting SG URB asynchronously, but that isn't > a big deal. The problem is that many USB host controllers can't build > one single > packet from two buffers, what is why USB stack requires size of all > buffers(except > for last one) in sg list can be divided by max endpoint packet > size.(1024 for usbnet) Ugh. Maybe the USB stack should allow drivers to find out about and take advantage of a more flexible host controller. Sounds like it could be a big job, though. Ben. (glad not to be using any USB net devices) -- Ben Hutchings, Staff Engineer, Solarflare Not speaking for my employer; that's the marketing department's job. They asked us to note that Solarflare product names are trademarked. -- 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
