linux-kernel - Re: [very-RFC 0/8] TSN driver for the kernel

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Message-ID: <20160611224954.GB10685@sisyphus.home.austad.us>
Date:	Sun, 12 Jun 2016 00:49:54 +0200
From:	Henrik Austad <henrik@...tad.us>
To:	linux-kernel@...r.kernel.org
Cc:	linux-media@...r.kernel.org, alsa-devel@...r.kernel.org,
	netdev@...r.kernel.org, henrk@...tad.us
Subject: Re: [very-RFC 0/8] TSN driver for the kernel

On Sun, Jun 12, 2016 at 12:22:13AM +0200, Henrik Austad wrote:
> Hi all

Sorry.. I somehow managed to mess up the address to netdev, so if you feel 
like replying to this, use this as it has the correct netdev-address.

again, sorry

> (series based on v4.7-rc2)
> 
> This is a *very* early RFC for a TSN-driver in the kernel. It has been
> floating around in my repo for a while and I would appreciate some
> feedback on the overall design to avoid doing some major blunders.
> 
> TSN: Time Sensitive Networking, formely known as AVB (Audio/Video
> Bridging).
> 
> There are at least one AVB-driver (the AV-part of TSN) in the kernel
> already, however this driver aims to solve a wider scope as TSN can do
> much more than just audio. A very basic ALSA-driver is added to the end
> that allows you to play music between 2 machines using aplay in one end
> and arecord | aplay on the other (some fiddling required) We have plans
> for doing the same for v4l2 eventually (but there are other fishes to
> fry first). The same goes for a TSN_SOCK type approach as well.
> 
> TSN is all about providing infrastructure. Allthough there are a few
> very interesting uses for TSN (reliable, deterministic network for audio
> and video), once you have that reliable link, you can do a lot more.
> 
> Some notes on the design:
> 
> The driver is directed via ConfigFS as we need userspace to handle
> stream-reservation (MSRP), discovery and enumeration (IEEE 1722.1) and
> whatever other management is needed. Once we have all the required
> attributes, we can create link using mkdir, and use write() to set the
> attributes. Once ready, specify the 'shim' (basically a thin wrapper
> between TSN and another subsystem) and we start pushing out frames.
> 
> The network part: it ties directly into the rx-handler for receive and
> writes skb's using netdev_start_xmit(). This could probably be
> improved. 2 new fields in netdev_ops have been introduced, and the Intel
> igb-driver has been updated (as this is available as a PCI-e card). The
> igb-driver works-ish
> 
> 
> What remains
> - tie to (g)PTP properly, currently using ktime_get() for presentation
>   time
> - get time from shim into TSN and vice versa
> - let shim create/manage buffer
> 
> Henrik Austad (8):
>   TSN: add documentation
>   TSN: Add the standard formerly known as AVB to the kernel
>   Adding TSN-driver to Intel I210 controller
>   Add TSN header for the driver
>   Add TSN machinery to drive the traffic from a shim over the network
>   Add TSN event-tracing
>   AVB ALSA - Add ALSA shim for TSN
>   MAINTAINERS: add TSN/AVB-entries
> 
>  Documentation/TSN/tsn.txt                 | 147 +++++
>  MAINTAINERS                               |  14 +
>  drivers/media/Kconfig                     |  15 +
>  drivers/media/Makefile                    |   3 +-
>  drivers/media/avb/Makefile                |   5 +
>  drivers/media/avb/avb_alsa.c              | 742 +++++++++++++++++++++++
>  drivers/media/avb/tsn_iec61883.h          | 124 ++++
>  drivers/net/ethernet/intel/Kconfig        |  18 +
>  drivers/net/ethernet/intel/igb/Makefile   |   2 +-
>  drivers/net/ethernet/intel/igb/igb.h      |  19 +
>  drivers/net/ethernet/intel/igb/igb_main.c |  10 +-
>  drivers/net/ethernet/intel/igb/igb_tsn.c  | 396 ++++++++++++
>  include/linux/netdevice.h                 |  32 +
>  include/linux/tsn.h                       | 806 ++++++++++++++++++++++++
>  include/trace/events/tsn.h                | 349 +++++++++++
>  net/Kconfig                               |   1 +
>  net/Makefile                              |   1 +
>  net/tsn/Kconfig                           |  32 +
>  net/tsn/Makefile                          |   6 +
>  net/tsn/tsn_configfs.c                    | 623 +++++++++++++++++++
>  net/tsn/tsn_core.c                        | 975 ++++++++++++++++++++++++++++++
>  net/tsn/tsn_header.c                      | 203 +++++++
>  net/tsn/tsn_internal.h                    | 383 ++++++++++++
>  net/tsn/tsn_net.c                         | 403 ++++++++++++
>  24 files changed, 5306 insertions(+), 3 deletions(-)
>  create mode 100644 Documentation/TSN/tsn.txt
>  create mode 100644 drivers/media/avb/Makefile
>  create mode 100644 drivers/media/avb/avb_alsa.c
>  create mode 100644 drivers/media/avb/tsn_iec61883.h
>  create mode 100644 drivers/net/ethernet/intel/igb/igb_tsn.c
>  create mode 100644 include/linux/tsn.h
>  create mode 100644 include/trace/events/tsn.h
>  create mode 100644 net/tsn/Kconfig
>  create mode 100644 net/tsn/Makefile
>  create mode 100644 net/tsn/tsn_configfs.c
>  create mode 100644 net/tsn/tsn_core.c
>  create mode 100644 net/tsn/tsn_header.c
>  create mode 100644 net/tsn/tsn_internal.h
>  create mode 100644 net/tsn/tsn_net.c
> 
> --
> 2.7.4

-- 
Henrik Austad