Am Freitag, 18. Juni 2010 22:34:28 schrieb David Brownell: > (1.N full size packets then a short one to > terminate) out of multiple SKBs (and for the > sake of argument, I'll assume the various NCM > headers are packaged in SKBs too ... possibly > discrete, possibly prepended to other SKBs. > > We don't currently have a way to describe USB > transfers except as the single buffer associated > with an URB. Specifically, we can't build one > transfer out of two or more URBs. If I may, I'd like to separate this question, because it is crucial for the rest of the discussion. > Storage carefully keeps each URB's buffer > distinct, and doesn't try to map/combine > them into a single ginormous transfer, > holding the equivalent of multiple Ethernet > packets. Doesn't the storage driver do exactly that? It builds a single transfer out of multiple buffers. It seems to me that we can build a single transfer out of multiple buffers provided all but the last buffers meet some size constraint. I cannot see the difference. Could you elaborate? Regards Oliver -- 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
