[config] Add 'config interface mtu' command

config/main.py

@@ -1400,6 +1400,27 @@ def mgmt_ip_restart_services():
     cmd="systemctl restart ntp-config"
     os.system (cmd)
 
+#
+# 'mtu' subcommand
+#
+
+@interface.command()
+@click.pass_context
+@click.argument('interface_name', metavar='<interface_name>', required=True)
+@click.argument('interface_mtu', metavar='<interface_mtu>', required=True)
+@click.option('-v', '--verbose', is_flag=True, help="Enable verbose output")
+def mtu(ctx, interface_name, interface_mtu, verbose):
+    """Set interface mtu"""
+    if get_interface_naming_mode() == "alias":
+        interface_name = interface_alias_to_name(interface_name)
+        if interface_name is None:
+            ctx.fail("'interface_name' is None!")
+
+    command = "portconfig -p {} -m {}".format(interface_name, interface_mtu)
+    if verbose:
+        command += " -vv"
+    run_command(command, display_cmd=verbose)
+
 #
 # 'ip' subgroup ('config interface ip ...')
 #

doc/Command-Reference.md

@@ -2417,6 +2417,22 @@ Dynamic breakout feature is yet to be supported in SONiC and hence uses cannot c
   admin@sonic:~$ sudo config interface Ethernet63 speed 40000
   ```
 
+**config interface mtu <interface_name> (Versions >= 201904)**
+
+This command is used to configure the mtu for the Physical interface. Use the value 1500 for setting max transfer unit size to 1500 bytes.
+
+- Usage:
+
+  *Versions >= 201904*
+  ```
+  config interface mtu <interface_name> <mtu_value>
+  ```
+
+- Example (Versions >= 201904):
+  ```
+  admin@sonic:~$ sudo config interface mtu Ethernet64 1500
+  ```
+
 Go Back To [Beginning of the document](#) or [Beginning of this section](#interfaces)
 
 

scripts/portconfig

@@ -2,7 +2,7 @@
 """
 portconfig is the utility to show and change ECN configuration
 
-usage: portconfig [-h] [-v] [-s] [-f] [-p PROFILE] [-gmin GREEN_MIN]
+usage: portconfig [-h] [-v] [-s] [-f] [-m] [-p PROFILE] [-gmin GREEN_MIN]
                  [-gmax GREEN_MAX] [-ymin YELLOW_MIN] [-ymax YELLOW_MAX]
                  [-rmin RED_MIN] [-rmax RED_MAX] [-vv]
 
@@ -13,6 +13,7 @@ optional arguments:
   -p     --port                port name
   -s     --speed               port speed in Mbits
   -f     --fec                 port fec mode
+  -m     --mtu                 port mtu in bytes
 """
 from __future__ import print_function
 
@@ -25,6 +26,7 @@ import swsssdk
 PORT_TABLE_NAME = "PORT"
 PORT_SPEED_CONFIG_FIELD_NAME = "speed"
 PORT_FEC_CONFIG_FIELD_NAME = "fec"
+PORT_MTU_CONFIG_FIELD_NAME = "mtu"
 
 class portconfig(object):
     """
@@ -57,6 +59,11 @@ class portconfig(object):
             print("Setting fec %s on port %s" % (fec, port))
         self.db.mod_entry(PORT_TABLE_NAME, port, {PORT_FEC_CONFIG_FIELD_NAME: fec})
 
+    def set_mtu(self, port, mtu):
+        if self.verbose:
+            print("Setting mtu %s on port %s" % (mtu, port))
+        self.db.mod_entry(PORT_TABLE_NAME, port, {PORT_MTU_CONFIG_FIELD_NAME: mtu})
+
 def main():
     parser = argparse.ArgumentParser(description='Set SONiC port parameters',
                          version='1.0.0',
@@ -65,18 +72,21 @@ def main():
     parser.add_argument('-l', '--list', action='store_true', help='list port parametars', default=False)
     parser.add_argument('-s', '--speed', type=int, help='port speed value in Mbit', default=None)
     parser.add_argument('-f', '--fec', type=str, help='port fec mode value in (none, rs, fc)', default=None)
+    parser.add_argument('-m', '--mtu', type=int, help='port mtu value in bytes', default=None)
     parser.add_argument('-vv', '--verbose', action='store_true', help='Verbose output', default=False)
     args = parser.parse_args()
 
     try:
         port = portconfig(args.verbose, args.port)
         if args.list:
             port.list_params(args.port)
-        elif args.speed or args.fec:
+        elif args.speed or args.fec or args.mtu:
             if args.speed:
                 port.set_speed(args.port, args.speed)
             if args.fec:
                 port.set_fec(args.port, args.fec)
+            if args.mtu:
+                port.set_mtu(args.port, args.mtu)
         else:
             parser.print_help()
             sys.exit(1)