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

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Date:	Wed, 31 Jul 2013 13:12:08 +0200
From:	Oliver Neukum <oneukum@...e.de>
To:	Ming Lei <ming.lei@...onical.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Freddy Xin <freddy@...x.com.tw>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Ben Hutchings <bhutchings@...arflare.com>,
	Grant Grundler <grundler@...gle.com>, netdev@...r.kernel.org,
	linux-usb@...r.kernel.org
Subject: Re: [PATCH 0/4] USB & USBNET: loose DMA SG check and support usbnet
 DMA SG

On Wed, 2013-07-31 at 18:51 +0800, Ming Lei 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 support this kind
> of sg buffers.

Cool. One question though. It makes sense to use sg only
if all elements are in memory capable of DMA. It seems to be possible
to have HCs which can do unlimited sg but are limited to 32bit DMA.

	Regards
		Oliver


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