Re: [PATCH v2 00/10] thunderbolt: Introduce USB4STREAM

[Mika Westerberg <mika.westerberg@linux.intel.com>]

On Mon, May 11, 2026 at 12:27:34PM +0200, Mika Westerberg wrote:
> Hi all,
> 
> This series adds support for a new protocol over USB4/Thunderbolt cable
> called USB4STREAM. The protocol is super-simple and basically just
> transfers raw packets from one host to another. It is documented as part of
> the thunderbolt_stream driver.
> 
> The driver exposes /dev/tbstreamX devices on each side of the link that can
> be used to transfer data using regular filesystem operations such as
> read(2) and write(2):
> 
>   host1 # cat /dev/tbstream0
>   host2 # echo hello > /dev/tbstream0
> 
> This can be useful in cases where network tooling is not available or just
> for existing applications like 'dd' and 'cat' that do not support sockets.
> 
> thunderbolt_stream can be used at the same time with thunderbolt_net so
> they don't rule each other our. 
> 
> thunderbolt_stream allows multiple streams to be created, for example one
> stream for control traffic and another for data (there are some limitations
> in the core USB4/Thunderbolt driver due to dedicated flow control scheme
> but this is likely change in the future). Each stream is bi-directional
> tunnel over the fabric.
> 
> There are a couple of additional usage examples in the last patch that adds
> the driver itself.
> 
> Previous version of the series is avaiable here:
>   
>    https://lore.kernel.org/linux-usb/20260428072209.3084930-1-mika.westerberg@linux.intel.com/
> 
> Changes from the previous version:
> 
>   * Dropped module parameter from the network driver.
>   * Convert stream driver to use miscdevice instead.
>   * Add documentation how to use stream to admin guide.
> 
> Mika Westerberg (10):
>   thunderbolt: Add tb_property_merge_dir()
>   thunderbolt: Add KUnit test for tb_property_merge_dir()
>   thunderbolt: Allow service drivers to specify their own properties
>   thunderbolt / net: Move ring_frame_size() to thunderbolt.h
>   thunderbolt / net: Let the service drivers configure interrupt throttling
>   thunderbolt: Add helper to figure size of the ring
>   thunderbolt: Add tb_ring_flush()
>   thunderbolt: Add support for ConfigFS
>   thunderbolt: Add support for USB4STREAM
>   docs: admin-guide: thunderbolt: Add instructions how to use USB4STREAM

All applied to thunderbolt.git/next.