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Fix for LLDP portname exposed as MAC address bug (#3152)

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* Subscribe to both ConfigDB and AppDB
to get notifications to apply LLDP port config

* the operstate file is not consistent
Removing this since it is not serving any purpose

* Remove check for PortInitDone and PortConfigDone
This is not prteset in Config DB

* Remove checking State DB for port creation

* Check for key to be present before fetching it

* Addressing review comments
This commit is contained in:
Sumukha Tumkur Vani 2019-07-17 16:04:01 -07:00 committed by Ying Xie
parent b1181291ce
commit c79774767e
1 changed files with 59 additions and 39 deletions
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96
dockers/docker-lldp-sv2/lldpmgrd Executable file → Normal file
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@ -71,18 +71,6 @@ def signal_handler(sig, frame):
else:
log_warning("Caught unhandled signal '" + sig + "'")
# ========================== Helpers ==================================
def is_port_exist(port_name):
filename = "/sys/class/net/%s/operstate" % port_name
if os.path.exists(filename):
with open(filename) as fp:
state = fp.read()
return "up" in state
else:
filename = "/sys/class/net/%s/ifindex" % port_name
return os.path.exists(filename)
# ============================== Classes ==============================
class LldpManager(object):
@ -101,20 +89,43 @@ class LldpManager(object):
REDIS_TIMEOUT_MS = 0
def __init__(self):
# Open a handle to the State database
self.state_db = swsscommon.DBConnector(swsscommon.STATE_DB,
self.REDIS_HOSTNAME,
self.REDIS_PORT,
self.REDIS_TIMEOUT_MS)
# Open a handle to the Config database
self.config_db = swsscommon.DBConnector(swsscommon.CONFIG_DB,
self.REDIS_HOSTNAME,
self.REDIS_PORT,
self.REDIS_TIMEOUT_MS)
# Open a handle to the Application database
self.appl_db = swsscommon.DBConnector(swsscommon.APPL_DB,
self.REDIS_HOSTNAME,
self.REDIS_PORT,
self.REDIS_TIMEOUT_MS)
self.pending_cmds = {}
def is_port_up(self, port_name):
"""
Determine if a port is up or down by looking into the oper-status for the port in
PORT TABLE in the Application DB
"""
# Retrieve all entires for this port from the Port table
port_table = swsscommon.Table(self.appl_db, swsscommon.APP_PORT_TABLE_NAME)
(status, fvp) = port_table.get(port_name)
if status:
# Convert list of tuples to a dictionary
port_table_dict = dict(fvp)
# Get the oper-status for the port
if port_table_dict.has_key("oper_status"):
port_oper_status = port_table_dict.get("oper_status")
log_info("Port name {} oper status: {}".format(port_name, port_oper_status))
return port_oper_status == "up"
else:
return False
else:
log_error("Port '{}' not found in {} table in App DB".format(port_name, swsscommon.APP_PORT_TABLE_NAME))
return False
def generate_pending_lldp_config_cmd_for_port(self, port_name):
"""
For port `port_name`, look up the description and alias in the Config database,
@ -157,11 +168,6 @@ class LldpManager(object):
to_delete = []
for (port_name, cmd) in self.pending_cmds.iteritems():
if not is_port_exist(port_name):
# it doesn't make any sense to configure lldpd if the target port does not exist
# let's postpone the command for the next iteration
continue
log_debug("Running command: '{}'".format(cmd))
proc = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
@ -185,37 +191,51 @@ class LldpManager(object):
def run(self):
"""
Subscribes to notifications of changes in the PORT table
of the Redis State database.
Subscribe to STATE_DB - get notified of the creation of an interface
of the Redis Config/Application database.
Subscribe to APP_DB - get port oper status
Subscribe to CONFIG_DB - get notified of port config changes
Update LLDP configuration accordingly.
"""
# Set select timeout to 10 seconds
SELECT_TIMEOUT_MS = 1000 * 10
# Subscribe to PORT table notifications in the State DB
sel = swsscommon.Select()
sst = swsscommon.SubscriberStateTable(self.state_db, swsscommon.STATE_PORT_TABLE_NAME)
sel.addSelectable(sst)
sst = swsscommon.SubscriberStateTable(self.config_db, swsscommon.CFG_PORT_TABLE_NAME)
sel.addSelectable(sst)
# Listen for changes to the PORT table in the STATE_DB and CONFIG_DB
# Subscribe to PORT table notifications in the Config DB
sst_confdb = swsscommon.SubscriberStateTable(self.config_db, swsscommon.CFG_PORT_TABLE_NAME)
sel.addSelectable(sst_confdb)
# Subscribe to PORT table notifications in the App DB
sst_appdb = swsscommon.SubscriberStateTable(self.appl_db, swsscommon.APP_PORT_TABLE_NAME)
sel.addSelectable(sst_appdb)
# Listen for changes to the PORT table in the CONFIG_DB and APP_DB
while True:
(state, c) = sel.select(SELECT_TIMEOUT_MS)
if state == swsscommon.Select.OBJECT:
(key, op, fvp) = sst.pop()
(key, op, fvp) = sst_confdb.pop()
if fvp:
fvp_dict = dict(fvp)
# handle creation
if op == "SET" and fvp_dict.get("state") == "ok":
self.generate_pending_lldp_config_cmd_for_port(key)
# handle config change
if op in ["SET", "DEL"] and (fvp_dict.get("alias") or fvp_dict.get("description")) :
if (fvp_dict.has_key("alias") or fvp_dict.has_key("description")) and (op in ["SET", "DEL"]):
if self.is_port_up(key):
self.generate_pending_lldp_config_cmd_for_port(key)
else:
self.pending_cmds.pop(key, None)
(key, op, fvp) = sst_appdb.pop()
if (key != "PortInitDone") and (key != "PortConfigDone"):
if fvp:
fvp_dict = dict(fvp)
# handle port status change
if fvp_dict.has_key("oper_status"):
if "up" in fvp_dict.get("oper_status"):
self.generate_pending_lldp_config_cmd_for_port(key)
else:
self.pending_cmds.pop(key, None)
# Process all pending commands
self.process_pending_cmds()