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Subject: Re: Read FRU of host through ipmi in Entity manager.
To: Kumar Thangavel <thangavel.k@hcl.com>,
 "openbmc@lists.ozlabs.org" <openbmc@lists.ozlabs.org>
Cc: Jae Hyun Yoo <jae.hyun.yoo@linux.intel.com>,
 Vernon Mauery <vernon.mauery@linux.intel.com>,
 "vijaykhemka@fb.com" <vijaykhemka@fb.com>,
 James Feist <james.feist@linux.intel.com>,
 "Velumani T-ERS, HCLTech" <velumanit@hcl.com>,
 Patrick Williams <patrickw3@fb.com>
References: <HK0PR04MB2964FFC6D5EF008F106FFC13FD230@HK0PR04MB2964.apcprd04.prod.outlook.com>
From: "Thomaiyar, Richard Marian" <richard.marian.thomaiyar@linux.intel.com>
Message-ID: <f31aa36a-4519-7e68-7ff4-fab62b6bb42e@linux.intel.com>
Date: Mon, 14 Sep 2020 22:55:24 +0530
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Hi Kumar,

Better to expose IPMI FRU of the host read via IPMB through FRU 
Interface (i.e. say xyz.openbmc_project.IPMB.FruDevice daemon, which can 
expose all the FRU's read through the same). In this way, current 
EntityManager probe will still work. (Note: We can add the support in 
FRUDevice if it is IPMB read of raw FRU data, so that conversion code in 
FRUDevice can still be used).

Current plan (under discussion - Needs to finalize) to expose the PLDM 
FRU in separate daemon under interface 
(https://github.com/openbmc/phosphor-dbus-interfaces/tree/master/xyz/openbmc_project/Inventory/Source/PLDM) 


James, Do you see any issue with this approach / comments ?

Regards,
Richard

On 9/14/2020 10:25 PM, Kumar Thangavel wrote:
>
> Classification: *HCL Internal*
>
> Hi All,
>
>          We are working on the Platform which has multi host and the 
> host are FRUs.  The host and BMC communication is based on IPMB. We 
> have each host is connected in separate ipmb bus.
>
>          Existing Entity manager has the FRU read info from EEPROM 
> (I2C)in the form of bin file.
>          We understand that entity manager does not support ipmb based 
> host fru.
>
>          So, we are proposing the design to support ipmb based FRU in 
> entity manager.
>          From Entity manager, we will send the generic "read host fru" 
> command request to ipmbbrige to read the host FRU.
>
>          Then, store the host fru info in the bin file to process and 
> creating dbus objects in the entity manager.
>
>          Please let us know your comments on this.
>
> Thanks,
>
> Kumar.
>
> ::DISCLAIMER::
> ------------------------------------------------------------------------
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    <p>Hi Kumar,<br>
    </p>
    <p>Better to expose IPMI FRU of the host read via IPMB through FRU
      Interface (i.e. say xyz.openbmc_project.IPMB.FruDevice daemon,
      which can expose all the FRU's read through the same). In this
      way, current EntityManager probe will still work. (Note: We can
      add the support in FRUDevice if it is IPMB read of raw FRU data,
      so that conversion code in FRUDevice can still be used).<br>
    </p>
    <p>Current plan (under discussion - Needs to finalize) to expose the
      PLDM FRU in separate daemon under interface
(<a class="moz-txt-link-freetext" href="https://github.com/openbmc/phosphor-dbus-interfaces/tree/master/xyz/openbmc_project/Inventory/Source/PLDM">https://github.com/openbmc/phosphor-dbus-interfaces/tree/master/xyz/openbmc_project/Inventory/Source/PLDM</a>)
      <br>
    </p>
    <div class="moz-cite-prefix">James, Do you see any issue with this
      approach / comments ?<br>
    </div>
    <div class="moz-cite-prefix"><br>
    </div>
    <div class="moz-cite-prefix">Regards,</div>
    <div class="moz-cite-prefix">Richard<br>
    </div>
    <div class="moz-cite-prefix"><br>
    </div>
    <div class="moz-cite-prefix">On 9/14/2020 10:25 PM, Kumar Thangavel
      wrote:<br>
    </div>
    <blockquote type="cite"
cite="mid:HK0PR04MB2964FFC6D5EF008F106FFC13FD230@HK0PR04MB2964.apcprd04.prod.outlook.com">
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        <p class="MsoNormal" style="margin-bottom:12.0pt">Classification:
          <b><span style="color:#08298A">HCL Internal</span></b><span
            style="font-size:12.0pt"><o:p></o:p></span></p>
        <p class="MsoNormal">Hi All,<o:p></o:p></p>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal"><span
            style="font-size:10.5pt;font-family:&quot;Segoe
            UI&quot;,sans-serif">         We are working on the Platform
            which has multi host and the host are FRUs.  The host and
            BMC communication is based on IPMB. We have each host
            is connected in separate ipmb bus.<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.5pt;font-family:&quot;Segoe
            UI&quot;,sans-serif">         Existing Entity manager has
            the FRU read info from EEPROM (I2C)in the form of bin file.<br>
                     We understand that entity manager does not support
            ipmb based host fru.<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.5pt;font-family:&quot;Segoe
            UI&quot;,sans-serif"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.5pt;font-family:&quot;Segoe
            UI&quot;,sans-serif">         So, we are proposing the
            design to support ipmb based FRU in entity manager.<br>
                     From Entity manager, we will send the generic "read
            host fru" command request to ipmbbrige to read the host FRU.<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.5pt;font-family:&quot;Segoe
            UI&quot;,sans-serif">         Then, store the host fru info
            in the bin file to process and creating dbus objects in the
            entity manager.<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.5pt;font-family:&quot;Segoe
            UI&quot;,sans-serif"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.5pt;font-family:&quot;Segoe
            UI&quot;,sans-serif">         Please let us know your
            comments on this. <o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.5pt;font-family:&quot;Segoe
            UI&quot;,sans-serif"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.5pt;font-family:&quot;Segoe
            UI&quot;,sans-serif">Thanks,<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.5pt;font-family:&quot;Segoe
            UI&quot;,sans-serif">Kumar.<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.5pt;font-family:&quot;Segoe
            UI&quot;,sans-serif"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.5pt;font-family:&quot;Segoe
            UI&quot;,sans-serif"><o:p> </o:p></span></p>
        <p class="MsoNormal"><o:p> </o:p></p>
      </div>
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        <hr>
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