Re: [PATCH v6 0/3] hw/{i2c,nvme}: mctp endpoint, nvme management interface model

[Corey Minyard <minyard@acm.org>]

On Wed, Sep 20, 2023 at 12:48:03PM +0100, Jonathan Cameron via wrote:
> On Thu, 14 Sep 2023 11:53:40 +0200
> Klaus Jensen <its@irrelevant.dk> wrote:
> 
> > 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>
> 
> Hi Klaus,
> 
> Silly question, but who is likely to pick this up? + likely to be soon?
> 
> I'm going to post the CXL stuff that makes use of the core support shortly
> and whilst I can point at this patch set on list, I'd keen to see it upstream
> to reduce the dependencies (it's got 2 sets ahead of it of CXL stuff
> anyway but that will all hopefully go through Michael Tsirkin's tree
> for PCI stuff in one go).

I can pick it up, but he can just request a merge, too.

I did have a question I asked earlier about tests.  It would be unusual
at this point to add something like this without having some tests,
especially injecting invalid data.

-corey

> 
> Jonathan
> 
> > ---
> > Changes in v6:
> > - Use nmi_scratch_append() directly where it makes sense. Fixes bug
> >   observed by Andrew.
> > - Link to v5: https://lore.kernel.org/r/20230905-nmi-i2c-v5-0-0001d372a728@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             | 407 +++++++++++++++++++++++++++++++++++++++
> >  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, 1064 insertions(+)
> > ---
> > base-commit: 005ad32358f12fe9313a4a01918a55e60d4f39e5
> > change-id: 20230822-nmi-i2c-d804ed5be7e6
> > 
> > Best regards,
> 
>