On Sat, Aug 3, 2013 at 10:46 AM, Ming Lei <ming.lei@xxxxxxxxxxxxx> wrote: > Hi, > > This patchset allows drivers to pass sg buffers which size can't be divided > by max packet size of endpoint if the host controllers(such ax xHCI) support > this kind of sg buffers. > > Previously we added check[1] on the situation and don't allow these sg buffers > passed to USB HCD, looks the check is too strict to make use of new feature of > new hardware(xHCI) for some applications(such as network stack) which can't > provide this kind of sg buffers to usbnet driver, so the patch looses the check > in case that the host controller supports it. > > Patch 3/4 implements DMA SG on usbnet driver, and patch 4/4 uses it on ax88179_178a > USB3 NIC for supporting TSO, so both CPU utilization and tx throughput can be > improved with TSO and DMA SG in case of the USB NIC is attached to xHCI controller. > > This patchset is against Eric Dumazet's patch(ax88179_178a: avoid copy of tx > tcp packets), so maybe it is better to merge via net-next tree. Looks it is a bit complicated, so it can't work via net-next. - patch 1/4 depends on current usb-next tree - patch 2/4 depends on patch 1/4 - patch 4/4 depends on both patch 1/4 and Eric's patch Thanks, -- Ming Lei -- 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
