Adding vpp platform (#1424)

VPP is a new platform of SONiC. Here is the HLD: https://github.com/sonic-net/sonic-platform-vpp/blob/main/docs/HLD/SONICVPP-HLD.md. Currently, VPP is built by patching itself on top of VS platform, which requires it carrying a lot of diffs. It is very difficult to upgrade SONiC because patch may have a lot of conflicts. We will make VPP a platform as any other platforms to avoid patching.

What this change is doing
VPP SAI layer is built on top of vslib. It uses some classes from sonic-sairedis/meta so we need to export the header files from libsaimetata-dev.
This PR also adds some vpp specific logic to syncd_init_common.sh before starting syncd.

debian/libsaimetadata-dev.install

@@ -1,5 +1,12 @@
 meta/sai*.h usr/include/sai
 meta/Sai*.h usr/include/sai
+meta/Meta.h usr/include/sai
+meta/AttrKeyMap.h usr/include/sai
+meta/MetaKeyHasher.h usr/include/sai
+meta/OidRefCounter.h usr/include/sai
+meta/PortRelatedSet.h usr/include/sai
+meta/Notification*.h usr/include/sai
+meta/Globals.h usr/include/sai
 SAI/meta/sai*.h usr/include/sai
 usr/lib/*/libsaimetadata.so
 usr/lib/*/libsaimeta.so

syncd/scripts/syncd_init_common.sh

@@ -337,6 +337,24 @@ config_syncd_vs()
     CMD_ARGS+=" -l -p $HWSKU_DIR/sai.profile"
 }
 
+vpp_api_check()
+{
+   VPP_API_SOCK=$1
+   while true
+   do
+      [ -S "$VPP_API_SOCK" ] && vpp_api_test socket-name $VPP_API_SOCK <<< "show_version" 2>/dev/null | grep "version:" && break
+      sleep 1
+   done
+}
+
+config_syncd_vpp()
+{
+    CMD_ARGS+=" -p $HWSKU_DIR/sai.profile"
+    vpp_api_check "/run/vpp/api.sock"
+    source /etc/sonic/vpp/syncd_vpp_env
+    export NO_LINUX_NL
+}
+
 config_syncd_soda()
 {
     # Add support for SAI bulk operations
@@ -471,6 +489,8 @@ config_syncd()
         config_syncd_nephos
     elif [ "$SONIC_ASIC_TYPE" == "vs" ]; then
         config_syncd_vs
+    elif [ "$SONIC_ASIC_TYPE" == "vpp" ]; then
+        config_syncd_vpp
     elif [ "$SONIC_ASIC_TYPE" == "innovium" ]; then
         config_syncd_innovium
     elif [ "$SONIC_ASIC_TYPE" == "soda" ]; then