netdev - Re: [PATCH v4 0/4] USB & USBNET: loose SG check and support usbnet DMA SG

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Date:	Fri, 9 Aug 2013 14:13:23 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	David Miller <davem@...emloft.net>
Cc:	ming.lei@...onical.com, oneukum@...e.de,
	sarah.a.sharp@...ux.intel.com, netdev@...r.kernel.org,
	linux-usb@...r.kernel.org
Subject: Re: [PATCH v4 0/4] USB & USBNET: loose SG check and support usbnet
 DMA SG

On Fri, Aug 09, 2013 at 02:12:17PM -0700, David Miller wrote:
> From: Ming Lei <ming.lei@...onical.com>
> Date: Thu,  8 Aug 2013 21:48:21 +0800
> 
> > 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 depends on both net-next and usb-next tree, so hope David and Greg
> > to figure out one elegent way to merge it.
> 
> Greg feel free to merge this in via your USB tree with my:
> 
> Acked-by: David S. Miller <davem@...emloft.net>

Thanks, will do.

greg k-h
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