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SubjectRe: [PATCH v2 00/16] Thunderbolt networking
From
Date
On Mon, 2017-09-25 at 14:07 +0300, Mika Westerberg wrote:
> Hi all,
>
> In addition of tunneling PCIe, Display Port and USB traffic,
> Thunderbolt
> allows connecting two hosts (domains) over a Thunderbolt cable. It is
> possible to tunnel arbitrary data packets over such connection using
> high-speed DMA rings available in the Thunderbolt host controller.
>
> In order to discover Thunderbolt services the other host supports,
> there is
> a software protocol running on top of the automatically configured
> control
> channel (ring 0). This protocol is called XDomain discovery protocol
> and it
> uses XDomain properties to describe the host (domain) and the services
> it
> supports.
>
> Once both sides have agreed what services are supported they can
> enable
> high-speed DMA rings to transfer data over the cable.
>
> This series adds support for the XDomain protocol so that we expose
> each
> remote connection as Thunderbolt XDomain device and each service as
> Thunderbolt service device. On top of that we create an API that
> allows
> writing drivers for these services and finally we provide an example
> Thunderbolt service driver that creates virtual ethernet inferface
> that
> allows tunneling networking packets over Thunderbolt cable. The API
> could
> be used for creating other Thunderbolt services, such as tunneling
> SCSI for
> example.
>
> The XDomain protocol and networking support is also available in macOS
> and
> Windows so this makes it possible to connect Linux to macOS and
> Windows as
> well.
>
> The patches are based on previous Thunderbolt networking patch series
> by
> Amir Levy and Michael Jamet, that can be found here:
>
> https://lwn.net/Articles/705998/
>
> The main difference to that patch series is that we have the XDomain
> protocol running in the kernel now so there is no need for a separate
> userspace daemon.
>
> Note this does not affect the existing functionality, so security
> levels
> and NVM firmware upgrade continue to work as before (with the small
> exception that now sysfs also shows the XDomain connections and
> services in
> addition to normal Thunderbolt devices). It is also possible to
> connect up
> to 5 Thunderbolt devices and then another host, and the network driver
> works exactly the same.
>
> This is second version of the patch series. The previous version (v1)
> can
> be found here:
>
> https://lwn.net/Articles/734019/
>
> Changes from the v1:
>
> * Add include/linux/thunderbolt.h to MAINTAINERS
> * Correct Linux version and date of new sysfs entries in
> Documentation/ABI/testing/sysfs-bus-thunderbolt
> * Move network driver from drivers/thunderbolt/net.c to
> drivers/net/thunderbolt.c and update it to follow coding style in
> drivers/net/*.
> * Add MAINTAINERS entry for the network driver
> * Minor cleanups
>
> In case someone wants to try this out, patch [16/16] adds
> documentation how
> the networking driver can be used. In short, if you connect Linux to a
> macOS or Windows, everything is done automatically (as those systems
> have
> the networking service enabled by default). For Linux to Linux
> connection
> one host needs to load the networking driver first (so that the other
> side
> can locate the networking service and load the corresponding driver).


Looks awesome!

Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

(I told privately to Mika about some minors and we agreed with him that
they will be considered only if there will be more comments on the
series)

>
> Amir Levy (1):
> net: Add support for networking over Thunderbolt cable
>
> Mika Westerberg (15):
> byteorder: Move {cpu_to_be32,be32_to_cpu}_array() from Thunderbolt
> to core
> thunderbolt: Add support for XDomain properties
> thunderbolt: Move enum tb_cfg_pkg_type to thunderbolt.h
> thunderbolt: Move thunderbolt domain structure to thunderbolt.h
> thunderbolt: Move tb_switch_phy_port_from_link() to thunderbolt.h
> thunderbolt: Add support for XDomain discovery protocol
> thunderbolt: Configure interrupt throttling for all interrupts
> thunderbolt: Add support for frame mode
> thunderbolt: Export ring handling functions to modules
> thunderbolt: Move ring descriptor flags to thunderbolt.h
> thunderbolt: Use spinlock in ring serialization
> thunderbolt: Use spinlock in NHI serialization
> thunderbolt: Add polling mode for rings
> thunderbolt: Add function to retrieve DMA device for the ring
> thunderbolt: Allocate ring HopID automatically if requested
>
> Documentation/ABI/testing/sysfs-bus-thunderbolt | 48 +
> Documentation/admin-guide/thunderbolt.rst | 24 +
> MAINTAINERS | 7 +
> drivers/net/Kconfig | 12 +
> drivers/net/Makefile | 3 +
> drivers/net/thunderbolt.c | 1379
> ++++++++++++++++++++
> drivers/thunderbolt/Makefile | 2 +-
> drivers/thunderbolt/ctl.c | 46 +-
> drivers/thunderbolt/ctl.h | 3 +-
> drivers/thunderbolt/domain.c | 197 ++-
> drivers/thunderbolt/icm.c | 218 +++-
> drivers/thunderbolt/nhi.c | 409 ++++--
> drivers/thunderbolt/nhi.h | 141 +-
> drivers/thunderbolt/nhi_regs.h | 11 +-
> drivers/thunderbolt/property.c | 670 ++++++++++
> drivers/thunderbolt/switch.c | 7 +-
> drivers/thunderbolt/tb.h | 88 +-
> drivers/thunderbolt/tb_msgs.h | 140 +-
> drivers/thunderbolt/xdomain.c | 1576
> +++++++++++++++++++++++
> include/linux/byteorder/generic.h | 16 +
> include/linux/mod_devicetable.h | 26 +
> include/linux/thunderbolt.h | 598 +++++++++
> scripts/mod/devicetable-offsets.c | 7 +
> scripts/mod/file2alias.c | 25 +
> 24 files changed, 5304 insertions(+), 349 deletions(-)
> create mode 100644 drivers/net/thunderbolt.c
> create mode 100644 drivers/thunderbolt/property.c
> create mode 100644 drivers/thunderbolt/xdomain.c
> create mode 100644 include/linux/thunderbolt.h
>

--
Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Intel Finland Oy

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