netdev - Re: [very-RFC 7/8] AVB ALSA

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Message-ID: <20160615114908.GB31281@localhost.localdomain>
Date:	Wed, 15 Jun 2016 13:49:08 +0200
From:	Richard Cochran <richardcochran@...il.com>
To:	Henrik Austad <henrik@...tad.us>
Cc:	linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
	alsa-devel@...r.kernel.org, netdev@...r.kernel.org,
	henrk@...tad.us, Henrik Austad <haustad@...co.com>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Takashi Iwai <tiwai@...e.de>, Mark Brown <broonie@...nel.org>
Subject: Re: [very-RFC 7/8] AVB ALSA - Add ALSA shim for TSN

Now that I understand better...

On Sun, Jun 12, 2016 at 01:01:35AM +0200, Henrik Austad wrote:
> Userspace is supposed to reserve bandwidth, find StreamID etc.
> 
> To use as a Talker:
> 
> mkdir /config/tsn/test/eth0/talker
> cd /config/tsn/test/eth0/talker
> echo 65535 > buffer_size
> echo 08:00:27:08:9f:c3 > remote_mac
> echo 42 > stream_id
> echo alsa > enabled

This is exactly why configfs is the wrong interface.  If you implement
the AVB device in alsa-lib user space, then you can handle the
reservations, configuration, UDP sockets, etc, in a way transparent to
the aplay program.

Heck, if done properly, your layer could discover the AVB nodes in the
network and present each one as a separate device...

Thanks,
Richard