[PATCH v5 0/3] hw/{i2c,nvme}: mctp endpoint, nvme management interface model

[Klaus Jensen <its@irrelevant.dk>]

This adds a generic MCTP endpoint model that other devices may derive
from.

Also included is a very basic implementation of an NVMe-MI device,
supporting only a small subset of the required commands.

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] (aspeed_ast2600evb_nmi_defconfig). 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/hwtests/tree/main/br2-external

Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
---
Changes in v5:
- Added a nmi_scratch_append() that asserts available space in the
  scratch buffer. This is a similar defensive strategy as used in
  hw/i2c/mctp.c
- Various small fixups in response to review (Jonathan)
- Link to v4: https://lore.kernel.org/r/20230823-nmi-i2c-v4-0-2b0f86e5be25@samsung.com

---
Klaus Jensen (3):
      hw/i2c: add smbus pec utility function
      hw/i2c: add mctp core
      hw/nvme: add nvme management interface model

 MAINTAINERS                   |   7 +
 hw/arm/Kconfig                |   1 +
 hw/i2c/Kconfig                |   4 +
 hw/i2c/mctp.c                 | 432 ++++++++++++++++++++++++++++++++++++++++++
 hw/i2c/meson.build            |   1 +
 hw/i2c/smbus_master.c         |  26 +++
 hw/i2c/trace-events           |  13 ++
 hw/nvme/Kconfig               |   4 +
 hw/nvme/meson.build           |   1 +
 hw/nvme/nmi-i2c.c             | 424 +++++++++++++++++++++++++++++++++++++++++
 hw/nvme/trace-events          |   6 +
 include/hw/i2c/mctp.h         | 125 ++++++++++++
 include/hw/i2c/smbus_master.h |   2 +
 include/net/mctp.h            |  35 ++++
 14 files changed, 1081 insertions(+)
---
base-commit: 17780edd81d27fcfdb7a802efc870a99788bd2fc
change-id: 20230822-nmi-i2c-d804ed5be7e6

Best regards,
-- 
Klaus Jensen <k.jensen@samsung.com>