linux-kernel - Re: FireWire/SBP2 Target mode

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Message-ID: <4F2FE705.3070509@ladisch.de>
Date:	Mon, 06 Feb 2012 15:43:17 +0100
From:	Clemens Ladisch <clemens@...isch.de>
To:	Chris Boot <bootc@...tc.net>
CC:	target-devel@...r.kernel.org,
	linux1394-devel@...ts.sourceforge.net,
	Boaz Harrosh <bharrosh@...asas.com>,
	Stefan Richter <stefanr@...6.in-berlin.de>,
	Andy Grover <agrover@...hat.com>, linux-scsi@...r.kernel.org,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: FireWire/SBP2 Target mode

Chris Boot wrote:
> You can pull the code from:
> git://github.com/bootc/Linux-SBP-2-Target.git

The TODO file says:
> * Update Juju so we can get the speed in the fw_address_handler callback

What is the speed needed for?

SBP-2 says:
| The target shall issue data transfer requests with a speed equal to
| that specified by the spd field in the ORB.

SBP-3 says:
| The target shall issue data transfer requests with a speed equal to
| that specified by the controlling spd field, whether in the ORB or in
| a node selector in an associated page table.

> Please note that you can't then disable a unit until all the targets
> are logged-out. For Linux this usually means 'rmmod firewire_sbp2'.

That driver should not, by default, log into targets on its own node.


Regards,
Clemens
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