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

Henrik Austad
2016-06-11T22:49:58Z

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