linux-kernel - Re: USBIP protocol

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Message-Id: <20080904212613.124d3656.zaitcev@redhat.com>
Date:	Thu, 4 Sep 2008 21:26:13 -0600
From:	Pete Zaitcev <zaitcev@...hat.com>
To:	Matthew Wilcox <matthew@....cx>
Cc:	Alan Stern <stern@...land.harvard.edu>, Greg KH <greg@...ah.com>,
	linux-usb@...r.kernel.org, bgmerrell@...ell.com,
	hirofuchi@...rs.sourceforge.net, linux-kernel@...r.kernel.org,
	usbip-devel@...ts.sourceforge.net
Subject: Re: USBIP protocol

On Thu, 4 Sep 2008 15:48:02 -0600, Matthew Wilcox <matthew@....cx> wrote:

> > It's referred to as SetPortFeature(PORT_RESET) in section 11.24.2.13;  
> > the request is actually sent to the device's upstream hub.
> 
> Mmm.  In this case, we don't have an upstream hub.  The vhci-hcd driver
> is on the host and sends URBs across the network where they're received
> by the stub driver.  The stub then sends them to the exported device.

I'm sorry I'm barging into the conversation, but a HC without a
root hub is rather shocking. One would think it easier to emulate
a root hub with one port in HCD than to teach the whole stack about
such thing as a hubless HC.

-- Pete
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