Add warm-reboot mode for teammgrd (sonic-net#678)

* Add Warm-reboot mode for teammgrd

Author: pavel-shirshov

cfgmgr/teammgr.cpp

@@ -5,6 +5,7 @@
 #include "logger.h"
 #include "shellcmd.h"
 #include "tokenize.h"
+#include "warm_restart.h"
 
 #include <algorithm>
 #include <sstream>
@@ -380,7 +381,15 @@ bool TeamMgr::addLag(const string &alias, int min_links, bool fallback)
     SWSS_LOG_INFO("Port channel %s teamd configuration: %s",
             alias.c_str(), conf.str().c_str());
 
-    cmd << TEAMD_CMD << " -r -t " << alias << " -c " << conf.str() << " -d";
+    string warmstart_flag = WarmStart::isWarmStart() ? " -w " : "";
+    const string dump_path = "/var/warmboot/teamd/";
+
+    cmd << TEAMD_CMD
+        << warmstart_flag
+        << " -r -t " << alias
+        << " -c " << conf.str()
+        << " -L " << dump_path
+        << " -d";
     EXEC_WITH_ERROR_THROW(cmd.str(), res);
 
     SWSS_LOG_NOTICE("Start port channel %s with teamd", alias.c_str());

cfgmgr/teammgrd.cpp

@@ -4,6 +4,7 @@
 #include "netdispatcher.h"
 #include "netlink.h"
 #include "select.h"
+#include "warm_restart.h"
 
 using namespace std;
 using namespace swss;
@@ -29,6 +30,9 @@ int main(int argc, char **argv)
         DBConnector app_db(APPL_DB, DBConnector::DEFAULT_UNIXSOCKET, 0);
         DBConnector state_db(STATE_DB, DBConnector::DEFAULT_UNIXSOCKET, 0);
 
+        WarmStart::initialize("teammgrd");
+        WarmStart::checkWarmStart("teammgrd");
+
         TableConnector conf_lag_table(&conf_db, CFG_LAG_TABLE_NAME);
         TableConnector conf_lag_member_table(&conf_db, CFG_LAG_MEMBER_TABLE_NAME);
         TableConnector state_port_table(&state_db, STATE_PORT_TABLE_NAME);