97f2cafe0b
* Fix for LLDP advertisments being sent with wrong information. Since lldpd is starting before lldpmgr, some advertisment packets might sent with default value, mac address as Port ID. This fix hold the packets from being sent by the lldpd until all interfaces are well configured by the lldpmgrd. Signed-off-by: Shlomi Bitton <shlomibi@nvidia.com> * Fix comments * Fix unit-test output caused a failure during build * Add 'run_cmd' function and use it * Resume lldpd even if port init timeout reached
260 lines
10 KiB
Python
Executable File
260 lines
10 KiB
Python
Executable File
#!/usr/bin/env python
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"""
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lldpmgrd
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LLDP manager daemon for SONiC
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Daemon which listens for changes in the PORT table of the State DB
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and updates LLDP configuration accordingly for that port by calling
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lldpcli.
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TODO: Also listen for changes in DEVICE_NEIGHBOR and PORT tables in
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Config DB and update LLDP config upon changes.
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"""
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try:
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import os
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import subprocess
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import sys
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import syslog
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import os.path
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import time
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from sonic_py_common import daemon_base
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from swsscommon import swsscommon
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except ImportError as err:
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raise ImportError("%s - required module not found" % str(err))
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VERSION = "1.0"
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SYSLOG_IDENTIFIER = "lldpmgrd"
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PORT_INIT_TIMEOUT = 300
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class LldpManager(daemon_base.DaemonBase):
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"""
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Class which subscribes to notifications of changes in the PORT table of
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the Redis State database and updates LLDP configuration accordingly for
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that port by calling lldpcli.
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Attributes:
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state_db: Handle to Redis State database via swsscommon lib
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config_db: Handle to Redis Config database via swsscommon lib
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pending_cmds: Dictionary where key is port name, value is pending
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LLDP configuration command to run
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"""
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REDIS_TIMEOUT_MS = 0
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def __init__(self, log_identifier):
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super(LldpManager, self).__init__(log_identifier)
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# Open a handle to the Config database
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self.config_db = swsscommon.DBConnector("CONFIG_DB",
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self.REDIS_TIMEOUT_MS,
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True)
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# Open a handle to the Application database
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self.appl_db = swsscommon.DBConnector("APPL_DB",
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self.REDIS_TIMEOUT_MS,
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True)
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self.pending_cmds = {}
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def is_port_up(self, port_name):
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"""
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Determine if a port is up or down by looking into the oper-status for the port in
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PORT TABLE in the Application DB
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"""
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# Retrieve all entires for this port from the Port table
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port_table = swsscommon.Table(self.appl_db, swsscommon.APP_PORT_TABLE_NAME)
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(status, fvp) = port_table.get(port_name)
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if status:
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# Convert list of tuples to a dictionary
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port_table_dict = dict(fvp)
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# Get the oper-status for the port
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if port_table_dict.has_key("oper_status"):
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port_oper_status = port_table_dict.get("oper_status")
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self.log_info("Port name {} oper status: {}".format(port_name, port_oper_status))
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return port_oper_status == "up"
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else:
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return False
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else:
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# Retrieve PortInitDone entry from the Port table
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(init_status, init_fvp) = port_table.get("PortInitDone")
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#The initialization procedure is done, but don't have this port entry
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if init_status:
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self.log_error("Port '{}' not found in {} table in App DB".format(port_name, swsscommon.APP_PORT_TABLE_NAME))
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return False
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def generate_pending_lldp_config_cmd_for_port(self, port_name):
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"""
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For port `port_name`, look up the description and alias in the Config database,
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then form the appropriate lldpcli configuration command and run it.
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"""
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port_desc = None
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# Retrieve all entires for this port from the Port table
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port_table = swsscommon.Table(self.config_db, swsscommon.CFG_PORT_TABLE_NAME)
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(status, fvp) = port_table.get(port_name)
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if status:
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# Convert list of tuples to a dictionary
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port_table_dict = dict(fvp)
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# Get the port alias. If None or empty string, use port name instead
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port_alias = port_table_dict.get("alias")
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if not port_alias:
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self.log_info("Unable to retrieve port alias for port '{}'. Using port name instead.".format(port_name))
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port_alias = port_name
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# Get the port description. If None or empty string, we'll skip this configuration
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port_desc = port_table_dict.get("description")
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else:
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self.log_error("Port '{}' not found in {} table in Config DB. Using port name instead of port alias.".format(port_name, swsscommon.CFG_PORT_TABLE_NAME))
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port_alias = port_name
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lldpcli_cmd = "lldpcli configure ports {0} lldp portidsubtype local {1}".format(port_name, port_alias)
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# if there is a description available, also configure that
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if port_desc:
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lldpcli_cmd += " description '{}'".format(port_desc)
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else:
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self.log_info("Unable to retrieve description for port '{}'. Not adding port description".format(port_name))
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# Add the command to our dictionary of pending commands, overwriting any
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# previous pending command for this port
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self.pending_cmds[port_name] = lldpcli_cmd
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def process_pending_cmds(self):
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# List of port names (keys of elements) to delete from self.pending_cmds
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to_delete = []
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for (port_name, cmd) in self.pending_cmds.iteritems():
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self.log_debug("Running command: '{}'".format(cmd))
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rc, stderr = run_cmd(self, cmd)
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# If the command succeeds, add the port name to our to_delete list.
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# We will delete this command from self.pending_cmds below.
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# If the command fails, log a message, but don't delete the command
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# from self.pending_cmds, so that the command will be retried the
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# next time this method is called.
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if rc == 0:
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to_delete.append(port_name)
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else:
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self.log_warning("Command failed '{}': {}".format(cmd, stderr))
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# Delete all successful commands from self.pending_cmds
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for port_name in to_delete:
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self.pending_cmds.pop(port_name, None)
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def run(self):
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"""
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Subscribes to notifications of changes in the PORT table
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of the Redis Config/Application database.
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Subscribe to APP_DB - get port oper status
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Subscribe to CONFIG_DB - get notified of port config changes
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Update LLDP configuration accordingly.
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"""
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self.log_info("Starting up...")
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if not os.geteuid() == 0:
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self.log_error("Must be root to run this daemon")
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print("Error: Must be root to run this daemon")
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sys.exit(1)
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# Set select timeout to 10 seconds
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SELECT_TIMEOUT_MS = 1000 * 10
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# Daemon is paused on the configuration file to avoid lldp packets with wrong information
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# until all interfaces are well configured on lldpd
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port_init_done = False
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port_config_done = False
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resume_lldp_sent = False
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start_time = time.time()
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sel = swsscommon.Select()
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# Subscribe to PORT table notifications in the Config DB
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sst_confdb = swsscommon.SubscriberStateTable(self.config_db, swsscommon.CFG_PORT_TABLE_NAME)
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sel.addSelectable(sst_confdb)
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# Subscribe to PORT table notifications in the App DB
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sst_appdb = swsscommon.SubscriberStateTable(self.appl_db, swsscommon.APP_PORT_TABLE_NAME)
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sel.addSelectable(sst_appdb)
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# Listen for changes to the PORT table in the CONFIG_DB and APP_DB
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while True:
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(state, c) = sel.select(SELECT_TIMEOUT_MS)
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if state == swsscommon.Select.OBJECT:
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(key, op, fvp) = sst_confdb.pop()
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if fvp:
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fvp_dict = dict(fvp)
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# handle config change
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if (fvp_dict.has_key("alias") or fvp_dict.has_key("description")) and (op in ["SET", "DEL"]):
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if self.is_port_up(key):
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self.generate_pending_lldp_config_cmd_for_port(key)
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else:
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self.pending_cmds.pop(key, None)
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(key, op, fvp) = sst_appdb.pop()
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if (key != "PortInitDone") and (key != "PortConfigDone"):
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if fvp:
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fvp_dict = dict(fvp)
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# handle port status change
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if fvp_dict.has_key("oper_status"):
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if "up" in fvp_dict.get("oper_status"):
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self.generate_pending_lldp_config_cmd_for_port(key)
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else:
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self.pending_cmds.pop(key, None)
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elif key == "PortInitDone":
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port_init_done = True
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elif key == "PortConfigDone":
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port_config_done = True
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# Process all pending commands
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self.process_pending_cmds()
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# Resume the daemon since all interfaces data updated and configured to the lldpd so no miss leading packets will be sent
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if not resume_lldp_sent:
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if check_timeout(self, start_time):
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port_init_done = port_config_done = True
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if port_init_done and port_config_done:
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port_init_done = port_config_done = False
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rc, stderr = run_cmd(self, "lldpcli resume")
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if rc != 0:
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self.log_error("Failed to resume lldpd with command: 'lldpcli resume': {}".format(stderr))
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sys.exit(1)
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resume_lldp_sent = True
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# ============================= Functions =============================
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def main():
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# Instantiate a LldpManager object
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lldpmgr = LldpManager(SYSLOG_IDENTIFIER)
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# Log all messages from INFO level and higher
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lldpmgr.set_min_log_priority_info()
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lldpmgr.run()
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def run_cmd(self, cmd):
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proc = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
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(stdout, stderr) = proc.communicate()
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return proc.returncode, stderr
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def check_timeout(self, start_time):
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if time.time() - start_time > PORT_INIT_TIMEOUT:
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self.log_error("Port init timeout reached ({} seconds), resuming lldpd...".format(PORT_INIT_TIMEOUT))
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return True
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return False
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if __name__ == "__main__":
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main()
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