ASIC internal temperature sensors support

[santhosh-kt]

What I did

1. ASICs have multiple internal thermal sensors.
2. With the help of configuration, a poller is introduced in Orchagent that will periodically retrieve values of these sensors with the help of SAI APIs (Add SAI_SWITCH_ATTR_CURRENT_TEMP to get average temperature from sensors opencomputeproject/SAI#880).
3. These retrieved values are being populated to the state DB (In "ASIC_TEMPERATURE_INFO" table).

Why I did it
As part of ASIC Thermal Monitoring HLD.

How I verified it
Tested out in below platforms.
asic_thermal_log.s6100.txt
asic_thermal_log.z9264.txt
asic_thermal_log.s5232.txt
asic_thermal_log.s6000.txt

Do not merge until sonic-net/sonic-swss-common#419 is committed and synced.

Configuration Sample(config_db.json)

1. To enable the poller:

  "ASIC_SENSORS": {
          "ASIC_SENSORS_POLLER_STATUS": {
                 "admin_status": "enable"                              
          }
   }

2. To disable the poller:

  "ASIC_SENSORS": {
          "ASIC_SENSORS_POLLER_STATUS": {
                 "admin_status": "disable"                              
          }
   }

3. To change the poller interval(Default time interval = 60 seconds):

  "ASIC_SENSORS": {
          "ASIC_SENSORS_POLLER_STATUS": {
                 "admin_status": "enable"                              
          },
          "ASIC_SENSORS_POLLER_INTERVAL": {
                 "interval": "30"
          }
   }

Test cases and their observations

Steps	Test Case scenarios	Result
(1)	Enabling the poller with default time interval in config-db.json and do “config reload”	Poller populated the “ASIC_TEMPERATURE_INFO” table in the state DB and updated the table every default interval.
(2)	Disabling the poller in config-db.json and do “config reload”	Poller disabled and the thermal sensors readings in “ASIC_TEMPERATURE_INFO” table are reset to 0
(3)	Enabling the poller and setting the interval to “30” in config-db.json and do “config reload”	Poller populated the “ASIC_TEMPERATURE_INFO” table in the state DB and updated the table every 30 seconds.
(4)	Disabling the poller by removing the configs from the config-db.json and do “config reload”	Poller disabled and the thermal sensors readings in “ASIC_TEMPERATURE_INFO” table are reset to 0
(5)	Repeating the steps (1), (2), (3), and (4) but with “reboot” instead of “config reload”	Same results as above
(6)	Repeating the steps (1), (2), (3), and (4) but with “fast-reboot” instead of “config reload”	Same results as above
(7)	Downgrading the SONiC with config enabling the poller	Configuration got neglected since not supported in the older version
(8)	Upgrading the SONiC with config enabling the poller	Poller ran and updated the “ASIC_TEMPERATURE_INFO” table in the state DB and updated the table every default interval.

Sample RedisDB ASIC Sensors Table Output(S6100)

Output: 443 => 44.3 degC

root@sonic:~# redis-cli -n 6 hgetall "ASIC_TEMPERATURE_INFO"
1) "temperature_0"
2) "443"
3) "temperature_1"
4) "452"
5) "temperature_2"
6) "457"
7) "temperature_3"
8) "447"
9) "temperature_4"
10) "433"
11) "temperature_5"
12) "457"
13) "temperature_6"
14) "423"
15) "temperature_7"
16) "443"
17) "maximum_temperature"
18) "477"
19) "average_temperature"
20) "451"
root@sonic:~#

Details if related
HLD Location: https://github.com/Azure/SONiC/blob/master/doc/asic_thermal_monitoring_hld.md

[santhosh-kt]

vs build failed due to missing dependency, sonic-net/sonic-swss-common#419

[jleveque]

sonic-net/sonic-swss-common#419 has merged. Submodule update PR is here: sonic-net/sonic-buildimage#6042

[santhosh-kt]

retest this please

[santhosh-kt]

retest this please

[santhosh-kt]

retest LGTM please

[santhosh-kt]

retest this please

[santhosh-kt]

retest this please

[padmanarayana]

@jleveque @keboliu : please review

[jleveque]

LGTM. @kcudnik to review, as well.

[prsunny]

Should we add VS tests?

[santhosh-kt]

retest this please

[padmanarayana]

@kcudnik , @prsunny : can you please review the changes ?

[kcudnik]

please wait for others to approve

[santhosh-kt]

@prsunny @keboliu : Please re-review the changes,

[prsunny]

lgtm..@keboliu

[santhosh-kt]

@keboliu Please review.

[keboliu]

LGTM

[jleveque]

@santhosh-kt: All reviewers have signed off and sonic-net/sonic-swss-common#419 has been merged and the submodule has been updated to include that commit. Are we good to merge this now?

[santhosh-kt]

@jleveque : Please proceed to merge and update the submodule.

[santhosh-kt]

@jleveque : This PR is yet to get update in the submodule.

[jleveque]

@santhosh-kt: Please feel free to open a PR to update the sonic-swss submodule in sonic-buildimage.