Update config/show to include PFC Watchdog commands (sonic-net#736)

* Add pfcwd utility to the config/show CLI

Signed-off-by: Andriy Moroz <c_andriym@mellanox.com>

* Add some more commands

Signed-off-by: Andriy Moroz <c_andriym@mellanox.com>

* [doc] Add start_default description

Signed-off-by: Andriy Moroz <c_andriym@mellanox.com>

config/main.py

@@ -843,6 +843,91 @@ def remove(session_name):
     config_db.connect()
     config_db.set_entry("MIRROR_SESSION", session_name, None)
 
+#
+# 'pfcwd' group ('config pfcwd ...')
+#
+@config.group()
+def pfcwd():
+    """Configure pfc watchdog """
+    pass
+
+@pfcwd.command()
+@click.option('--action', '-a', type=click.Choice(['drop', 'forward', 'alert']))
+@click.option('--restoration-time', '-r', type=click.IntRange(100, 60000))
+@click.option('--verbose', is_flag=True, help="Enable verbose output")
+@click.argument('ports', nargs=-1)
+@click.argument('detection-time', type=click.IntRange(100, 5000))
+def start(action, restoration_time, ports, detection_time, verbose):
+    """
+    Start PFC watchdog on port(s). To config all ports, use all as input.
+
+    Example:
+        config pfcwd start --action drop ports all detection-time 400 --restoration-time 400
+    """
+    cmd = "pfcwd start"
+
+    if action:
+        cmd += " --action {}".format(action)
+
+    if ports:
+        ports = set(ports) - set(['ports', 'detection-time'])
+        cmd += " ports {}".format(' '.join(ports))
+
+    if detection_time:
+        cmd += " detection-time {}".format(detection_time)
+
+    if restoration_time:
+        cmd += " --restoration-time {}".format(restoration_time)
+
+    run_command(cmd, display_cmd=verbose)
+
+@pfcwd.command()
+@click.option('--verbose', is_flag=True, help="Enable verbose output")
+def stop(verbose):
+    """ Stop PFC watchdog """
+
+    cmd = "pfcwd stop"
+
+    run_command(cmd, display_cmd=verbose)
+
+@pfcwd.command()
+@click.option('--verbose', is_flag=True, help="Enable verbose output")
+@click.argument('poll_interval', type=click.IntRange(100, 3000))
+def interval(poll_interval, verbose):
+    """ Set PFC watchdog counter polling interval (ms) """
+
+    cmd = "pfcwd interval {}".format(poll_interval)
+
+    run_command(cmd, display_cmd=verbose)
+
+@pfcwd.command()
+@click.option('--verbose', is_flag=True, help="Enable verbose output")
+@click.argument('counter_poll', type=click.Choice(['enable', 'disable']))
+def counter_poll(counter_poll, verbose):
+    """ Enable/disable counter polling """
+
+    cmd = "pfcwd counter_poll {}".format(counter_poll)
+
+    run_command(cmd, display_cmd=verbose)
+
+@pfcwd.command()
+@click.option('--verbose', is_flag=True, help="Enable verbose output")
+@click.argument('big_red_switch', type=click.Choice(['enable', 'disable']))
+def big_red_switch(big_red_switch, verbose):
+    """ Enable/disable BIG_RED_SWITCH mode """
+
+    cmd = "pfcwd big_red_switch {}".format(big_red_switch)
+
+    run_command(cmd, display_cmd=verbose)
+
+@pfcwd.command()
+@click.option('--verbose', is_flag=True, help="Enable verbose output")
+def start_default(verbose):
+    """ Start PFC WD by default configurations  """
+
+    cmd = "pfcwd start_default"
+
+    run_command(cmd, display_cmd=verbose)
 
 #
 # 'qos' group ('config qos ...')

doc/Command-Reference.md

@@ -73,6 +73,7 @@
 * [NTP](#ntp)
   * [NTP show commands](#ntp-show-commands)
   * [NTP config commands](#ntp-config-commands)
+* [PFC Watchdog Commands](#pfc-watchdog-commands)
 * [Platform Component Firmware](#platform-component-firmware)
   * [Platform Component Firmware show commands](#platform-component-firmware-show-commands)
   * [Platform Component Firmware config commands](#platform-component-firmware-config-commands)
@@ -3784,6 +3785,93 @@ This command is used to delete a configured NTP server IP address.
 
 Go Back To [Beginning of the document](#) or [Beginning of this section](#NTP)
 
+# PFC Watchdog Commands
+Detailed description of the PFC Watchdog could be fount on the [this wiki page](https://github.com/Azure/SONiC/wiki/PFC-Watchdog)
+
+**config pfcwd start \<arguments\>**
+
+This command starts PFC Watchdog
+
+- Usage:
+  ```
+  config pfcwd start --action drop ports all detection-time 400 --restoration-time 400
+  config pfcwd start --action forward ports Ethernet0 Ethernet8 detection-time 400
+  ```
+
+**config pfcwd stop**
+
+This command stops PFC Watchdog
+
+- Usage:
+  ```
+  config pfcwd stop
+  ```
+
+**config pfcwd interval \<interval_in_ms\>**
+
+This command sets PFC Watchdog counter polling interval (in ms)
+
+- Usage:
+  ```
+  config pfcwd interval 200
+  ```
+
+**config pfcwd counter_poll \<enable/disable\>**
+
+This command enables or disables PFCWD related counters polling
+
+- Usage:
+  ```
+  config pfcwd counter_poll disable
+  ```
+
+**config pfcwd big_red_switch \<enable/disable\>**
+
+This command enables or disables PFCWD's "BIG RED SWITCH"(BRS). After enabling BRS PFC Watchdog will be activated on all ports/queues it is configured for no matter whether the storm was detected or not
+
+- Usage:
+  ```
+  config pfcwd big_red_switch enable
+  ```
+
+**config pfcwd start_default**
+
+This command starts PFC Watchdog with the default settings.
+
+- Usage:
+  ```
+  config pfcwd start_default
+  ```
+
+Default values are the following:  
+
+   - detection time - 200ms
+   - restoration time - 200ms
+   - polling interval - 200ms
+   - action - 'drop'
+
+Additionally if number of ports in the system exceeds 32, all times will be multiplied by roughly <num_ports\>/32.
+
+
+**show pfcwd config**
+
+This command shows current PFC Watchdog configuration
+
+- Usage:
+  ```
+  show pfcwd config
+  ```
+
+**show pfcwd stats**
+
+This command shows current PFC Watchdog statistics (storms detected, packets dropped, etc)
+
+- Usage:
+  ```
+  show pfcwd stats
+  ```
+
+Go Back To [Beginning of the document](#) or [Beginning of this section](#pfc-watchdog-commands)
 
 ## Platform Component Firmware
 

show/main.py

@@ -1043,6 +1043,30 @@ def counters(verbose):
 
     run_command(cmd, display_cmd=verbose)
 
+# 'pfcwd' subcommand ("show pfcwd...")
+@cli.group(cls=AliasedGroup, default_if_no_args=False)
+def pfcwd():
+    """Show details of the pfc watchdog """
+    pass
+
+@pfcwd.command()
+@click.option('--verbose', is_flag=True, help="Enable verbose output")
+def config(verbose):
+    """Show pfc watchdog config"""
+
+    cmd = "pfcwd show config"
+
+    run_command(cmd, display_cmd=verbose)
+
+@pfcwd.command()
+@click.option('--verbose', is_flag=True, help="Enable verbose output")
+def stats(verbose):
+    """Show pfc watchdog stats"""
+
+    cmd = "pfcwd show stats"
+
+    run_command(cmd, display_cmd=verbose)
+
 # 'naming_mode' subcommand ("show interfaces naming_mode")
 @interfaces.command()
 @click.option('--verbose', is_flag=True, help="Enable verbose output")