From: Klaus Jensen <k.jensen@samsung.com>

This adds a generic MCTP endpoint model that other devices may derive
from. I'm not 100% happy with the design of the class methods, but it's
a start.

Also included is a very basic implementation of an NVMe-MI device,
supporting only a small subset of the required commands. Lior (CC'ed) has some
patches coming up that adds futher support.

Since this all relies on i2c target mode, this can currently only be
used with an SoC that includes the Aspeed I2C controller.

The easiest way to get up and running with this, is to grab my buildroot
overlay[1]. It includes modified a modified dts as well as a couple of
required packages.

QEMU can then be launched along these lines:

  qemu-system-arm \
    -nographic \
    -M ast2600-evb \
    -kernel output/images/zImage \
    -initrd output/images/rootfs.cpio \
    -dtb output/images/aspeed-ast2600-evb-nmi.dtb \
    -nic user,hostfwd=tcp::2222-:22 \
    -device nmi-i2c,address=0x3a \
    -serial mon:stdio

From within the booted system,

  mctp addr add 8 dev mctpi2c15
  mctp link set mctpi2c15 up
  mctp route add 9 via mctpi2c15
  mctp neigh add 9 dev mctpi2c15 lladdr 0x3a
  mi-mctp 1 9 info

Comments are very welcome!

  [1]: https://github.com/birkelund/buildroots/tree/main/mctp-i2c

Changes since v1
~~~~~~~~~~~~~~~~

  - Fix SPDX-License tag for hw/nvme/nmi-i2c.c (Philippe)
  - Add some asserts to verify buffer indices (by request from Corey).
  - Drop short packets that could result in underflow (Corey)
  - Move i2c_smbus_pec() to smbus common code (Corey)
  - A couple of logic fixes (patch from Jeremy squashed in)
  - Added a patch to handle messages with dest eid 0 (Matt)
    Maybe squash this as well.

Klaus Jensen (2):
  hw/i2c: add mctp core
  hw/nvme: add nvme management interface model

Matt Johnston (1):
  i2c/mctp: Allow receiving messages to dest eid 0

 MAINTAINERS                   |   7 +
 hw/arm/Kconfig                |   1 +
 hw/i2c/Kconfig                |   4 +
 hw/i2c/mctp.c                 | 353 +++++++++++++++++++++++++++++++
 hw/i2c/meson.build            |   1 +
 hw/i2c/smbus_master.c         |  28 +++
 hw/i2c/trace-events           |  12 ++
 hw/nvme/meson.build           |   1 +
 hw/nvme/nmi-i2c.c             | 382 ++++++++++++++++++++++++++++++++++
 hw/nvme/trace-events          |   6 +
 include/hw/i2c/mctp.h         | 114 ++++++++++
 include/hw/i2c/smbus_master.h |   3 +
 include/net/mctp.h            |  43 ++++
 13 files changed, 955 insertions(+)
 create mode 100644 hw/i2c/mctp.c
 create mode 100644 hw/nvme/nmi-i2c.c
 create mode 100644 include/hw/i2c/mctp.h
 create mode 100644 include/net/mctp.h

-- 
2.40.0