[FDBSYNCD] Added support for EVPN as described in the PR sonic-net/SO…

…NiC#437 (sonic-net#1276)

* [FPMSYNCD] EVPN Type5 prefix handling in FPMSYNCD.

This Change set is to support EVPN MAC/IMET routes from Kernel to DB and DB to Kernel:

New demon is added to sync MAC from Kernel to DB and vise versa.
Add remote IMET route learned via EVPN to EVPN_REMOTE_VNI_TABLE in APP_DB.
Add remote MAC route learned via EVPN to VXLAN_FDB_TABLE.
Add State DB FDB_TABLE for local learned MAC to Kernel

Signed-off-by: Kishore Kunal kishore.kunal@broadcom.com

.gitignore

@@ -56,6 +56,7 @@ gearsyncd/gearsyncd
 mclagsyncd/mclagsyncd
 natsyncd/natsyncd
 neighsyncd/neighsyncd
+fdbsyncd/fdbsyncd
 orchagent/orchagent
 orchagent/orchagent_restart_check
 orchagent/routeresync

Makefile.am

@@ -1,4 +1,4 @@
-SUBDIRS = fpmsyncd neighsyncd portsyncd mclagsyncd natsyncd orchagent swssconfig cfgmgr tests gearsyncd
+SUBDIRS = fpmsyncd neighsyncd fdbsyncd portsyncd mclagsyncd natsyncd orchagent swssconfig cfgmgr tests gearsyncd
 
 if HAVE_LIBTEAM
 SUBDIRS += teamsyncd tlm_teamd

configure.ac

@@ -92,6 +92,7 @@ AC_CONFIG_FILES([
     fpmsyncd/Makefile
     neighsyncd/Makefile
     gearsyncd/Makefile
+    fdbsyncd/Makefile
     natsyncd/Makefile
     portsyncd/Makefile
     teamsyncd/Makefile

fdbsyncd/Makefile.am

@@ -0,0 +1,16 @@
+INCLUDES = -I $(top_srcdir) -I $(top_srcdir)/warmrestart
+
+bin_PROGRAMS = fdbsyncd
+
+if DEBUG
+DBGFLAGS = -ggdb -DDEBUG
+else
+DBGFLAGS = -g
+endif
+
+fdbsyncd_SOURCES = fdbsyncd.cpp fdbsync.cpp $(top_srcdir)/warmrestart/warmRestartAssist.cpp
+
+fdbsyncd_CFLAGS = $(DBGFLAGS) $(AM_CFLAGS) $(CFLAGS_COMMON) $(COV_CFLAGS)
+fdbsyncd_CPPFLAGS = $(DBGFLAGS) $(AM_CFLAGS) $(CFLAGS_COMMON) $(COV_CFLAGS)
+fdbsyncd_LDADD = -lnl-3 -lnl-route-3 -lswsscommon $(COV_LDFLAGS)
+