Merge branch 'net-mctp-usb-add-support-for-mctp-over-usb-v1-1'

Jeremy Kerr says:

====================
net: mctp: usb: Add support for MCTP-over-USB v1.1

Version 1.1.0 of DSP0283 (MCTP over USB transport binding) has been
released, this patch series updates our current v1.0.1 support for the
changes in v1.1.x.

The major change in v1.1 is the introduction of "packet spanning" mode,
where a single MCTP packet may be split over multiple USB packets
(themselves forming a single USB bulk transfer). This relaxes the
requirement for USB high-speed mode, as we can now send MCTP packets
contained over multiple 64-byte full-speed USB bulk transfers, and gives
us an increase in the maximum MCTP packet size - we now have 13 bits of
packet length (previously 8) in the transport header.

Handling packet spanning introduces some complexity in the transmit and
receive paths, as we lose some constraints on where packet boundaries
may correspond to USB transfer boundaries, and may need to retain state
across separate transfers. To contain this complexity, we introduce a
new library for the transfer packing- and unpacking implementations,
"mctp-usblib". The host driver is a consumer of this library, and a
future gadget driver can use the same implementations. We can now also
implement tests on the API boundary of the library.

The series implements an incremental shift to mctp-usblib, then
implements packet spanning mode in the new library. We have a few
changes to prepare for this, in altering a few constants and
behaviours as v1.0-specific. Once packet spanning is implemented in
mctp-usblib, we enable it in the host-side driver.
====================

Link: https://patch.msgid.link/20260724-dev-mctp-usb-1-1-v5-0-e66bbba0dbdc@codeconstruct.com.au
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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