Interfacing IPMB using SSIF

[Fillod Stephane-2]

Hi,

Does anyone have implemented an IPMB controller (BMC) with a Linux I2C
stack?
Rem: please let me know when I don't use the right terminology.
I'm quite new to this whole IPMI world :-)

The basic idea would be to allow freeipmi based applications to do
in-band directly to IPMB. I don't know whether it makes a big
difference,
I have uTCA as the backplane in mind.

In order to implement a function ipmi_ssif_cmd_api_ipmb(), we would
need the OS (Linux in this case) to be able to handle an I2C slave write
IO,
in a multi-master fashion. IOW, when replying, some device on the IPMB
does
an I2C write IO to the Linux node (which is not to be mistaken with an
I2C
read), and the Linux node has to handle that IO. Maybe it could store it

until freeipmi retrieves it.
So, on top of I2C_RDWR ioctl, we would need a kind of I2C_SLAVE_RECV.
Does someone know whether such a thing exists? How best to define
and code the ioctl interface if no such ioctl exists?
Maybe a question to the Linux I2C guys? http://i2c.wiki.kernel.org

Thanks for your feedback
--
Stephane


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[Al Chu11]

Hey Fillod,

I haven't personally implemented one (obviously, since it's not in
FreeIPMI :-), but for some of your questions below ...

On Fri, 2009-07-17 at 19:27 +0200, Fillod Stephane wrote:

> Hi,
>
> Does anyone have implemented an IPMB controller (BMC) with a Linux I2C
> stack?
> Rem: please let me know when I don't use the right terminology.
> I'm quite new to this whole IPMI world :-)
>
> The basic idea would be to allow freeipmi based applications to do
> in-band directly to IPMB. I don't know whether it makes a big
> difference,
> I have uTCA as the backplane in mind.
>
> In order to implement a function ipmi_ssif_cmd_api_ipmb(), we would
> need the OS (Linux in this case) to be able to handle an I2C slave write
> IO,
> in a multi-master fashion. IOW, when replying, some device on the IPMB
> does
> an I2C write IO to the Linux node (which is not to be mistaken with an
> I2C
> read), and the Linux node has to handle that IO. Maybe it could store it
>
> until freeipmi retrieves it.
> So, on top of I2C_RDWR ioctl, we would need a kind of I2C_SLAVE_RECV.
> Does someone know whether such a thing exists? How best to define
> and code the ioctl interface if no such ioctl exists?

As you can see in the code, most of the time there is a generic "system
error" I return a SYSTEM_ERROR or INTERNAL_ERROR as needed.  If the
ioctl device just doesn't exist, we can just return an appropriate error
up the chain.

Al

> Maybe a question to the Linux I2C guys? http://*i2c.wiki.kernel.org
>
> Thanks for your feedback
--
Albert Chu
chu11@...
Computer Scientist
High Performance Systems Division
Lawrence Livermore National Laboratory



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