netdev - Re: [PATCH v1 0/4] USB & USBNET: loose SG check and support usbnet DMA SG

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Date:	Sun, 4 Aug 2013 08:28:06 +0800
From:	Ming Lei <ming.lei@...onical.com>
To:	"David S. Miller" <davem@...emloft.net>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Oliver Neukum <oneukum@...e.de>,
	Sarah Sharp <sarah.a.sharp@...ux.intel.com>,
	netdev@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH v1 0/4] USB & USBNET: loose SG check and support usbnet
 DMA SG

On Sat, Aug 3, 2013 at 10:46 AM, Ming Lei <ming.lei@...onical.com> 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
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