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Subject: Re: NC-SI driver: Detect OCP module power down!
To: Milton Miller II <miltonm@us.ibm.com>, openbmc <openbmc@lists.ozlabs.org>
References: <OF1171F140.21EF2A71-ON00258652.005BFA8E-1609692280165@notes.na.collabserv.com>
From: Thu Nguyen <thu@amperemail.onmicrosoft.com>
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On 1/3/21 23:44, Milton Miller II wrote:
> January 03, 2021 8:45 AM Thu Nguyen wrote and miltonm@us.ibm.com 
> <mailto:miltonm@us.ibm.com> responded:
>
> In our test platform, BMC boot up with NC-SI module is plugged and
> powered. NC-SI interface (eth0) is up and worked well.
>
> Then the power of NC-SI module is power off. NC-SI driver can't detect
> this state.
>
> BMC console keeps print:
>
> [ 1780.411126] ftgmac100 1e660000.ethernet eth0: NCSI Channel 0 timed out!
>
> [ 1785.579455] ftgmac100 1e660000.ethernet eth0: NCSI: No channel with
> link found, configuring channel 0
>
> [ 1802.253375] ftgmac100 1e660000.ethernet eth0: NCSI Channel 0 timed out!
>
> [ 1807.501456] ftgmac100 1e660000.ethernet eth0: NCSI: No channel with
> link found, configuring channel 0
>
> Look at the ncs-manager.c code, it seems if a channel of NC-SI module is
> time out its' monitor_state will be disabled, the link will be down then
> the driver will go to next channel.
>
> But if all of channels of NC-SI module are down. The driver will reset
> the monitor_state of all channels and check their states again.
>
> Milton> The NCSI specification explicitly says that power to the nics 
> and the controller must be synchronized.
>
>
> Do we have any mechanism to detect power off state of NC-SI module?
>
> Milton> No, but the state machines will reset if you ifconfig down the 
> interface.

[Thu] Thank for this info. It seem there are no ways to detect Power off 
state of NC-SI module.

This case is similar with the case OCP is failure or Unplugged when hot 
plug.

>
> How about hot plug NC-SI module?
>
>
> Regards.
>
> Thu Nguyen.
>
Regards.

Thu Nguyen.

>
>
>
>
>
>


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    <div class="moz-cite-prefix">On 1/3/21 23:44, Milton Miller II
      wrote:<br>
    </div>
    <blockquote type="cite" cite="mid:OF1171F140.21EF2A71-ON00258652.005BFA8E-1609692280165@notes.na.collabserv.com">
      
      January 03, 2021 8:45 AM Thu Nguyen wrote and <a href="mailto:miltonm@us.ibm.com" moz-do-not-send="true">miltonm@us.ibm.com</a>
      responded:<br>
      <br>
      In our test platform, BMC boot up with NC-SI module is plugged and
      <br>
      powered. NC-SI interface (eth0) is up and worked well.<br>
      <br>
      Then the power of NC-SI module is power off. NC-SI driver can't
      detect <br>
      this state.<br>
      <br>
      BMC console keeps print:<br>
      <br>
      [ 1780.411126] ftgmac100 1e660000.ethernet eth0: NCSI Channel 0
      timed out!<br>
      <br>
      [ 1785.579455] ftgmac100 1e660000.ethernet eth0: NCSI: No channel
      with <br>
      link found, configuring channel 0<br>
      <br>
      [ 1802.253375] ftgmac100 1e660000.ethernet eth0: NCSI Channel 0
      timed out!<br>
      <br>
      [ 1807.501456] ftgmac100 1e660000.ethernet eth0: NCSI: No channel
      with <br>
      link found, configuring channel 0<br>
      <br>
      Look at the ncs-manager.c code, it seems if a channel of NC-SI
      module is <br>
      time out its' monitor_state will be disabled, the link will be
      down then <br>
      the driver will go to next channel.<br>
      <br>
      But if all of channels of NC-SI module are down. The driver will
      reset <br>
      the monitor_state of all channels and check their states again.<br>
      <br>
      Milton&gt; The NCSI specification explicitly says that power to
      the nics and the controller must be synchronized.&nbsp; &nbsp;<br>
      <br>
      <br>
      Do we have any mechanism to detect power off state of NC-SI
      module?<br>
      <br>
      Milton&gt; No, but the state machines will reset if you ifconfig
      down the interface.<br>
    </blockquote>
    <p>[Thu] Thank for this info. It seem there are no ways to detect
      Power off state of NC-SI module.</p>
    <p>This case is similar with the case OCP is failure or Unplugged
      when hot plug.<br>
    </p>
    <blockquote type="cite" cite="mid:OF1171F140.21EF2A71-ON00258652.005BFA8E-1609692280165@notes.na.collabserv.com"><br>
      How about hot plug NC-SI module?<br>
      <br>
      <br>
      Regards.<br>
      <br>
      Thu Nguyen.<br>
      <br>
    </blockquote>
    <p>Regards.</p>
    <p>Thu Nguyen.<br>
    </p>
    <blockquote type="cite" cite="mid:OF1171F140.21EF2A71-ON00258652.005BFA8E-1609692280165@notes.na.collabserv.com"><br>
      <br>
      <br>
      <br>
      <br>
      <br>
    </blockquote>
    <p><br>
    </p>
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