linux-kernel - Re: [PATCH, RFC] USBIP protocol documentation

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Message-ID: <CAL-cBk1Kzr1Gn3YCHDpudkVSmdSWOcCo7_rpLddCUQ_3ZjP+kQ@mail.gmail.com>
Date:	Tue, 9 Aug 2011 17:23:14 +0800
From:	David Chang <dchang@...e.com>
To:	Greg KH <greg@...ah.com>
Cc:	Németh Márton <nm127@...email.hu>,
	Matthew Wilcox <matthew@....cx>, Max Vozeler <max@...eler.com>,
	Matt Mooney <mfm@...eddisk.com>, Joe Perches <joe@...ches.com>,
	linux-usb@...r.kernel.org, usbip-devel@...ts.sourceforge.net,
	devel@...verdev.osuosl.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH, RFC] USBIP protocol documentation

Hi Greg,

2011/6/28 Németh Márton <nm127@...email.hu>:
> From: Márton Németh <nm127@...email.hu>
>
> USBIP v1.0.0 protocol documentation.
>
> Signed-off-by: Márton Németh <nm127@...email.hu>
> ---
>
> Hi,
>
> I tried to document the USBIP protocol as implemented in the Linux kernel 3.0-rc2.
>
> The description is a preliminary draft only, it may contain mistakes. I tried
> to document what I have understand from the source code and from the actual
> captured network traffic when the USBIP is in action. Please review it, correct it,
> point out the missing parts.
>
> During I have documented the protocol a question came into my mind: why do we
> have two different type of package when the URB completition handler is called,
> namely USB_RET_SUBMIT and USBIP_RET_UNLINK? As far as I can see this causes race
> condition because for one URB the completition handler is only called once. If
> the one URB is sent in with USB_CMD_SUBMIT and then unlinked with USB_CMD_UNLINK
> the completition handler is called only once. In the protocol, however, we have
> two different type of packets: USB_RET_SUBMIT and USBIP_RET_UNLINK. The status
> field of these messages may contain anything in this case depending on the timing.
>
> Regards,
>
>        Márton Németh

Sorry, just one question about the usbip protocol document.
I would like to know why didn't you apply this patch.
Thanks in advance!

Best Regards,
David

>
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