[intfutil] Check whether the FEC mode is supported on the platform before configuring it to CONFIG_DB (sonic-net#2223)

* Support FEC capability

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

* Fix review comments

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

* Adjust dump table test according to STATE_DB change

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

* Add missing field in the test

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

* Do not change dump state test

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

Author: stephenxs

config/main.py

@@ -4192,8 +4192,6 @@ def fec(ctx, interface_name, interface_fec, verbose):
     # Get the config_db connector
     config_db = ctx.obj['config_db']
 
-    if interface_fec not in ["rs", "fc", "none"]:
-        ctx.fail("'fec not in ['rs', 'fc', 'none']!")
     if clicommon.get_interface_naming_mode() == "alias":
         interface_name = interface_alias_to_name(config_db, interface_name)
         if interface_name is None:

scripts/portconfig

@@ -65,7 +65,7 @@ SWITCH_CAPABILITY = "SWITCH_CAPABILITY|switch"
 # STATE_DB constants
 PORT_STATE_TABLE_NAME = "PORT_TABLE"
 PORT_STATE_SUPPORTED_SPEEDS = "supported_speeds"
-
+PORT_STATE_SUPPORTED_FECS = "supported_fecs"
 
 VALID_INTERFACE_TYPE_SET = set(['CR','CR2','CR4','CR8','SR','SR2','SR4','SR8',
                                 'LR','LR4','LR8','KR','KR4','KR8','CAUI','GMII',
@@ -131,6 +131,13 @@ class portconfig(object):
     def set_fec(self, port, fec):
         if self.verbose:
             print("Setting fec %s on port %s" % (fec, port))
+        supported_fecs = self.get_supported_fecs(port)
+        if fec not in supported_fecs:
+            if supported_fecs:
+                print('fec {} is not in {}'.format(fec, supported_fecs))
+            else:
+                print('Setting fec is not supported on port {}'.format(port))
+            exit(1)
         self.db.mod_entry(PORT_TABLE_NAME, port, {PORT_FEC_CONFIG_FIELD_NAME: fec})
 
     def set_mtu(self, port, mtu):
@@ -226,6 +233,26 @@ class portconfig(object):
         state_db.connect(state_db.STATE_DB)
         return state_db.get(state_db.STATE_DB, '{}|{}'.format(PORT_STATE_TABLE_NAME, port), PORT_STATE_SUPPORTED_SPEEDS)
 
+    def get_supported_fecs(self, port):
+        # If there is supported_fecs exposed in STATE_DB, let's use it.
+        # Otherwise, take the default
+        if not self.namespace:
+            state_db = SonicV2Connector(host="127.0.0.1")
+        else:
+            state_db = SonicV2Connector(host="127.0.0.1", namespace=self.namespace, use_unix_socket_path=True)
+        state_db.connect(state_db.STATE_DB)
+
+        supported_fecs_str = state_db.get(state_db.STATE_DB, '{}|{}'.format(PORT_STATE_TABLE_NAME, port), PORT_STATE_SUPPORTED_FECS)
+        if supported_fecs_str:
+            if supported_fecs_str != 'N/A':
+                supported_fecs_list = supported_fecs_str.split(',')
+            else:
+                supported_fecs_list = []
+        else:
+            supported_fecs_list = ["rs", "fc", "none"]
+
+        return supported_fecs_list
+
     def set_tpid(self, port, tpid):
         if self.verbose:
             print("Setting tpid %s on port %s" % (tpid, port))
@@ -276,7 +303,7 @@ def main():
     parser.add_argument('-p', '--port', type=str, help='port name (e.g. Ethernet0)', required=True, default=None)
     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('-f', '--fec', type=str, help='port fec mode value (default is: none, rs, fc)', default=None)
     parser.add_argument('-m', '--mtu', type=int, help='port mtu value in bytes', default=None)
     parser.add_argument('-tp', '--tpid', type=str, help='port TPID value in hex (e.g. 0x8100)', default=None)
     parser.add_argument('-v', '--version', action='version', version='%(prog)s 1.0')

tests/config_an_test.py

@@ -84,6 +84,22 @@ def test_config_mtu(self, ctx):
         result = self.basic_check("mtu", ["PortChannel0001", "1514"], ctx, operator.ne)
         assert 'Invalid port PortChannel0001' in result.output
 
+    def test_config_fec(self, ctx):
+        # Set a fec mode which is in supported_fec list but not default
+        # on an interface with supported_fec
+        self.basic_check("fec", ["Ethernet0", "test"], ctx)
+        # Set a fec mode which is one of default values on an interface without supported_fecs
+        self.basic_check("fec", ["Ethernet4", "rs"], ctx)
+        # Negative case: Set a fec mode which is default but not in port's supported_fecs
+        result = self.basic_check("fec", ["Ethernet0", "fc"], ctx, operator.ne)
+        assert "fec fc is not in ['rs', 'none', 'test']" in result.output
+        # Negative case: set a fec mode which is not default on an interface without supported_fecs
+        result = self.basic_check("fec", ["Ethernet4", "test"], ctx, operator.ne)
+        assert "fec test is not in ['rs', 'fc', 'none']" in result.output
+        # Negative case: set a fec mode on a port where setting fec is not supported
+        result = self.basic_check("fec", ["Ethernet112", "test"], ctx, operator.ne)
+        assert "Setting fec is not supported" in result.output
+
     def basic_check(self, command_name, para_list, ctx, op=operator.eq, expect_result=0):
         runner = CliRunner()
         result = runner.invoke(config.config.commands["interface"].commands[command_name], para_list, obj = ctx)

tests/mock_tables/state_db.json

@@ -698,13 +698,15 @@
         "rmt_adv_speeds" : "10,100,1000",
         "speed" : "100000",
         "supported_speeds": "10000,25000,40000,100000",
+        "supported_fecs": "rs,none,test",
         "link_training_status": "not_trained"
     },
     "PORT_TABLE|Ethernet32": {
         "link_training_status": "trained"
     },
     "PORT_TABLE|Ethernet112": {
         "speed": "40000",
+        "supported_fecs": "N/A",
         "link_training_status": "off"
     },
     "PCIE_DEVICE|00:01.0": {