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thermalctld: Add support for fans on non-CPU modules #555

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thermalctld: Add support for fans on non-CPU modules #555

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patrickmacarthur
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Description

This adds support to the show platform fans command to show fans that are on modules.

Motivation and Context

In the current Arista chassis model, the chassis fans are returned by Module.get_all_fans() as opposed to FanDrawer.get_all_fans(), which currently thermalctld makes no provision for. This change allows fans that are under the modules to be listed in the command output.

How Has This Been Tested?

This has been tested internally on a chassis, and the fan output now includes all fans on the chassis as opposed to just PSU fans:

admin@cmp206:~$ show platform fan
  Drawer    LED     FAN    Speed    Direction    Presence    Status          Timestamp
--------  -----  ------  -------  -----------  ----------  --------  -----------------
     N/A    off  fan0/1      29%      exhaust     Present        OK  20241030 15:54:08
     N/A    off  fan0/2      29%      exhaust     Present        OK  20241030 15:54:08
     N/A    red  fan0/3      29%      exhaust     Present        OK  20241030 15:54:08
     N/A    red  fan0/4      29%      exhaust     Present        OK  20241030 15:54:08
     N/A    red  fan0/5      29%      exhaust     Present        OK  20241030 15:54:08
     N/A    red  fan0/6      29%      exhaust     Present        OK  20241030 15:54:08
     N/A    red  fan0/7      29%      exhaust     Present        OK  20241030 15:54:08
     N/A    red  fan0/8      29%      exhaust     Present        OK  20241030 15:54:08
     N/A    off  fan1/1      29%      exhaust     Present        OK  20241030 15:54:08
     N/A    off  fan1/2      29%      exhaust     Present        OK  20241030 15:54:08
     N/A    off  fan1/3      29%      exhaust     Present        OK  20241030 15:54:08
     N/A    off  fan1/4      29%      exhaust     Present        OK  20241030 15:54:08
     N/A    off  fan1/5      29%      exhaust     Present        OK  20241030 15:54:08
     N/A    off  fan1/6      29%      exhaust     Present        OK  20241030 15:54:08
     N/A    off  fan1/7      29%      exhaust     Present        OK  20241030 15:54:08
     N/A    off  fan1/8      29%      exhaust     Present        OK  20241030 15:54:08
....
     N/A    off  psu2/1      49%       intake     Present        OK  20241030 15:54:08
     N/A    off  psu4/1      44%       intake     Present        OK  20241030 15:54:08
     N/A    off  psu6/1      44%       intake     Present        OK  20241030 15:54:08
     N/A    off  psu8/1      46%       intake     Present        OK  20241030 15:54:09

Additional Information (Optional)

Platform library support change sonic-net/sonic-buildimage#20603 should be merged before this change.

@abdosi
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abdosi commented Oct 30, 2024 •
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@bmridul and @mlok-nokia can you help check this . does this need sonic change or we should push this into platform implementation.

@rlhui rlhui requested a review from gechiang November 11, 2024 17:25
gechiang
gechiang approved these changes Nov 13, 2024
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LGTM

@gechiang
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Just want to higlight that this change has a dependency of this PR mentioned by Author in the PR description:
Platform library support change sonic-net/sonic-buildimage#20603 should be merged before this change.

@rlhui
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rlhui commented Nov 27, 2024

Just want to higlight that this change has a dependency of this PR mentioned by Author in the PR description: Platform library support change sonic-net/sonic-buildimage#20603 should be merged before this change.

@bmridul and @mlok-nokia can you help check this . does this need sonic change or we should push this into platform implementation.

@bmridul , @mlok-nokia ping again

@spilkey-cisco
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I like this change! But at the same time, I think support should be added to include fans from all possible locations, not just add Modules. Similar to Module, fans may exist directly on the chassis, and not in a fan drawer. Can a type and handling for that be added in this PR as well?

@patrickmacarthur
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I like this change! But at the same time, I think support should be added to include fans from all possible locations, not just add Modules. Similar to Module, fans may exist directly on the chassis, and not in a fan drawer. Can a type and handling for that be added in this PR as well?

This already exists today; any fan in a fan drawer on the chassis is already displayed. This PR is just adding missing output for fans that are attached to modules.

@spilkey-cisco
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I like this change! But at the same time, I think support should be added to include fans from all possible locations, not just add Modules. Similar to Module, fans may exist directly on the chassis, and not in a fan drawer. Can a type and handling for that be added in this PR as well?

This already exists today; any fan in a fan drawer on the chassis is already displayed. This PR is just adding missing output for fans that are attached to modules.

I'm referring specifically to fans not in a physical fan drawer (adding CHASSIS as a type in addition to DRAWER). Today, vendors must configure some notion of a 'logical' fan drawer to house fans connected directly to the chassis (not in a physical fan drawer), essentially treating the chassis itself as a fan drawer. This could be further confused by a chassis that could have both physical fan drawers with fans, and fans directly connected to the chassis without fan drawers. This feels like an unnecessary limitation, but perhaps there is some reason I'm missing as to why this should not be done?

spilkey-cisco
spilkey-cisco reviewed Nov 27, 2024
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sonic-thermalctld/scripts/thermalctld
except Exception as e:
self.log_warning('Failed to update fan status - {}'.format(repr(e)))

for module_index, module in enumerate(self.chassis.get_all_modules()):
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Thermals first check is_chassis_system before looping over module details, should that be done here as well? Or it's perhaps an unnecessary check there? https://github.com/sonic-net/sonic-platform-daemons/blob/master/sonic-thermalctld/scripts/thermalctld#L599 That also looks at PSUs connected to the modules, which may themselves have fans.

The PR title describes this as only for non-CPU modules, but it looks like that is not actually a limitation; won't this get all fans in any module where they are configured? Not necessarily a bad thing, but worth noting.

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mlok-nokia commented Nov 29, 2024 •
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Just want to higlight that this change has a dependency of this PR mentioned by Author in the PR description: Platform library support change sonic-net/sonic-buildimage#20603 should be merged before this change.

@bmridul and @mlok-nokia can you help check this . does this need sonic change or we should push this into platform implementation.

@bmridul , @mlok-nokia ping again

PR

Just want to higlight that this change has a dependency of this PR mentioned by Author in the PR description: Platform library support change sonic-net/sonic-buildimage#20603 should be merged before this change.

@bmridul and @mlok-nokia can you help check this . does this need sonic change or we should push this into platform implementation.

@bmridul , @mlok-nokia ping again

I think these 2 PR can be pushed independently. PR20603 is just Arista's platform specified code.

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