netdev - Re: [PATCH 1/1] TX throttling bug-fixing patch of AX88179

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Date:	Thu, 25 Jul 2013 16:00:35 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Ming Lei <tom.leiming@...il.com>
CC:	Eric Dumazet <eric.dumazet@...il.com>,
	Oliver Neukum <oliver@...kum.org>,
	Grant Grundler <grundler@...gle.com>,
	Freddy Xin <freddy@...x.com.tw>,
	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>, <linux-usb@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	ASIX Louis [蘇威陸] 
	<louis@...x.com.tw>, "Allan Chou" <allan@...x.com.tw>
Subject: Re: [PATCH 1/1] TX throttling bug-fixing patch of AX88179_178A

On Thu, 2013-07-25 at 22:52 +0800, Ming Lei wrote:
[...]
> On Thu, Jul 25, 2013 at 9:34 PM, Ben Hutchings
> <bhutchings@...arflare.com> wrote:
> >
> > Not that I have any experience with USB drivers, but perhaps
> > usb_sg_init()?
> 
> USB SG library doesn't support submitting SG URB asynchronously, but that isn't
> a big deal.  The problem is that many USB host controllers can't build
> one single
> packet from two buffers, what is why USB stack requires size of all
> buffers(except
> for last one) in sg list can be divided by max endpoint packet
> size.(1024 for usbnet)

Ugh.  Maybe the USB stack should allow drivers to find out about and
take advantage of a more flexible host controller.  Sounds like it could
be a big job, though.

Ben. (glad not to be using any USB net devices)

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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