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From: "Milton Miller II" <miltonm@us.ibm.com>
To: "Thu Nguyen" <thu@amperemail.onmicrosoft.com>,
	"openbmc" <openbmc@lists.ozlabs.org>
Subject: Re:  NC-SI driver: Detect OCP module power down!
Date: Sun, 3 Jan 2021 16:44:40 +0000	[thread overview]
Message-ID: <OF1171F140.21EF2A71-ON00258652.005BFA8E-1609692280165@notes.na.collabserv.com> (raw)


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January 03, 2021 8:45 AM Thu Nguyen wrote and 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.

How about hot plug NC-SI module?


Regards.

Thu Nguyen.








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             reply	other threads:[~2021-01-03 16:46 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-03 16:44 Milton Miller II [this message]
2021-01-05 15:38 ` NC-SI driver: Detect OCP module power down! Thu Nguyen
  -- strict thread matches above, loose matches on Subject: below --
2021-01-03 14:43 Thu Nguyen

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