[psushow & psuutil] Support PSU power threshold checking

[stephenxs]

What I did

Support PSU power threshold checking

1. Introduce a new state for the PSU, indicating whether a PSU power threshold is exceeded
2. For psuutil, expose the power thresholds
3. Add HW Rev to psuutil

Signed-off-by: Stephen Sun stephens@nvidia.com

How I did it

How to verify it

Unit and manual test

Previous command output (if the output of a command-line utility has changed)

show platform psustatus

admin@sonic:~$ show platform  psustatus
PSU    Model          Serial        HW Rev      Voltage (V)    Current (A)    Power (W)  Status  LED
-----  -------------  ------------  --------  -------------  -------------  -----------  ------- -----
PSU 1  MTEF-PSF-AC-A  MT1629X14911  A3                12.08           5.19        62.62  OK      green
PSU 2  MTEF-PSF-AC-A  MT1629X14913  A3                12.01           4.38        52.50  OK      green

psuutil

admin@sonic:~$ show platform psustatus
PSU   Model         Serial       HW Rev   Voltage (V)   Current (A)   Power (W)   Status LED
----- ------------- ------------ -------- ------------- ------------- ----------- ------- -----
PSU 1 MTEF-PSF-AC-A MT1843K17965 A4               12.02          3.62       43.56 OK      green
PSU 2 MTEF-PSF-AC-A MT1843K17966 A4               12.04          4.25       51.12 OK      green

New command output (if the output of a command-line utility has changed)

show platform psustatus
WARNING state can be seen.

admin@sonic:~$ show platform  psustatus
PSU    Model          Serial        HW Rev      Voltage (V)    Current (A)    Power (W)  Status  LED
-----  -------------  ------------  --------  -------------  -------------  -----------  ------- -----
PSU 1  MTEF-PSF-AC-A  MT1629X14911  A3                12.08           5.19        62.62  WARNING green
PSU 2  MTEF-PSF-AC-A  MT1629X14913  A3                12.01           4.38        52.50  OK      green

psuutil

admin@sonic:~$ psuutil
PSU   Model         Serial       HW Rev   Voltage (V)   Current (A)   Power (W)   Power Warn-supp Thres (W)   Power Crit Thres (W)    Status LED
----- ------------- ------------ -------- ------------- ------------- ----------- --------------------------- ---------------------- ------- -----
PSU 1 MTEF-PSF-AC-A MT1843K17965 A4               12.02          3.62       43.56                       38.00                  58.00 OK      green
PSU 2 MTEF-PSF-AC-A MT1843K17966 A4               12.04          4.25       51.12                       38.00                  58.00 OK      green

[lgtm-com]

This pull request introduces 2 alerts when merging f5165b3 into e14f679 - view on LGTM.com

new alerts:

• 2 for Testing equality to None

[prgeor]

@stephenxs could you resolve merge conflicts?

[prgeor]

@stephenxs Please populate these sections of the PR template:-

Previous command output (if the output of a command-line utility has changed)
New command output (if the output of a command-line utility has changed)

[stephenxs]

@stephenxs Please populate these sections of the PR template:-

Previous command output (if the output of a command-line utility has changed)
New command output (if the output of a command-line utility has changed)

Done

[stephenxs]

@stephenxs could you resolve merge conflicts?

Done by rebasing it.

[stephenxs]

psutest.txt
@prgeor a test log. all PSU test passed