[swss] Enhance ARP Update to Call Sonic Cfggen Once (#5398)

This PR limited the number of calls to sonic-cfggen to one call
per iteration instead of current 3 calls per iteration.

The PR also installs jq on host for future scripts if needed.

signed-off-by: Tamer Ahmed <tamer.ahmed@microsoft.com>

build_debian.sh

@@ -301,7 +301,8 @@ sudo LANG=C DEBIAN_FRONTEND=noninteractive chroot $FILESYSTEM_ROOT apt-get -y in
     ipmitool                \
     ndisc6                  \
     makedumpfile            \
-    conntrack
+    conntrack               \
+    jq
 
 
 if [[ $CONFIGURED_ARCH == amd64 ]]; then

dockers/docker-orchagent/Dockerfile.j2

@@ -63,7 +63,7 @@ RUN apt-get clean -y        && \
     rm -rf /debs
 
 COPY ["files/arp_update", "/usr/bin"]
-COPY ["arp_update.conf", "/usr/share/sonic/templates/"]
+COPY ["arp_update.conf", "files/arp_update_vars.j2", "/usr/share/sonic/templates/"]
 COPY ["enable_counters.py", "/usr/bin"]
 COPY ["docker-init.sh", "orchagent.sh", "swssconfig.sh", "/usr/bin/"]
 COPY ["supervisord.conf", "/etc/supervisor/conf.d/"]

files/build_templates/arp_update_vars.j2

@@ -0,0 +1,5 @@
+{
+    "interface": "{% for (name, prefix) in INTERFACE|pfx_filter %}{% if prefix|ipv6 %}{{ name }} {% endif %}{% endfor %}",
+    "pc_interface" : "{% for (name, prefix) in PORTCHANNEL_INTERFACE|pfx_filter %}{% if prefix|ipv6 %}{{ name }} {% endif %}{% endfor %}",
+    "vlan" : "{% if VLAN %}{{ VLAN.keys() | join(' ') }}{% endif %}"
+}

files/scripts/arp_update

@@ -7,12 +7,13 @@
 # Send gratuitous ARP/NDP requests to VLAN member neighbors to refresh
 # the ipv4/ipv6 neighbors state.
 
+ARP_UPDATE_VARS_FILE="/usr/share/sonic/templates/arp_update_vars.j2"
+
 while /bin/true; do
   # find L3 interfaces which are UP, send ipv6 multicast pings
-  echo "{% for (name, prefix) in INTERFACE|pfx_filter %} {{name}} {% endfor %}" > /tmp/intf_tmp.j2
-  INTERFACE=`sonic-cfggen -d -t /tmp/intf_tmp.j2`
-  echo "{% for (name, prefix) in PORTCHANNEL_INTERFACE|pfx_filter %} {{name}} {% endfor %}" > /tmp/pc_intf_tmp.j2
-  PC_INTERFACE=`sonic-cfggen -d -t /tmp/pc_intf_tmp.j2`
+  ARP_UPDATE_VARS=$(sonic-cfggen -d -t ${ARP_UPDATE_VARS_FILE})
+  INTERFACE=$(echo $ARP_UPDATE_VARS | jq -r '.interface')
+  PC_INTERFACE=$(echo $ARP_UPDATE_VARS | jq -r '.pc_interface')
 
   ALL_INTERFACE="$INTERFACE $PC_INTERFACE"
   for intf in $ALL_INTERFACE; do
@@ -23,7 +24,7 @@ while /bin/true; do
       fi
   done
 
-  VLAN=`sonic-cfggen -d -v 'VLAN.keys() | join(" ") if VLAN'`
+  VLAN=$(echo $ARP_UPDATE_VARS | jq -r '.vlan')
   for vlan in $VLAN; do
       # generate a list of arping commands:
       #   arping -q -w 0 -c 1 -i <VLAN interface> <IP 1>;

platform/p4/docker-sonic-p4.mk

@@ -23,7 +23,8 @@ $(DOCKER_SONIC_P4)_DEPENDS += $(QUAGGA)
 # endif
 
 $(DOCKER_SONIC_P4)_FILES += $(CONFIGDB_LOAD_SCRIPT) \
-                            $(ARP_UPDATE_SCRIPT)
+                            $(ARP_UPDATE_SCRIPT) \
+                            $(ARP_UPDATE_VARS_TEMPLATE)
 
 $(DOCKER_SONIC_P4)_LOAD_DOCKERS += $(DOCKER_CONFIG_ENGINE)
 SONIC_DOCKER_IMAGES += $(DOCKER_SONIC_P4)

platform/p4/docker-sonic-p4/Dockerfile.j2

@@ -16,6 +16,7 @@ RUN apt-get install -y net-tools \
                        ethtool \
                        tcpdump \
                        ifupdown \
+                       jq \
                        bridge-utils \
                        python-ply \
                        libqt5core5a \
@@ -79,6 +80,7 @@ COPY ["start.sh", "orchagent.sh", "config_bm.sh", "/usr/bin/"]
 COPY ["supervisord.conf", "/etc/supervisor/conf.d/"]
 COPY ["files/configdb-load.sh", "/usr/bin/"]
 COPY ["files/arp_update", "/usr/bin"]
+COPY ["files/arp_update_vars.j2", "/usr/share/sonic/templates/"]
 RUN echo "docker-sonic-p4" > /etc/hostname
 RUN touch /etc/quagga/zebra.conf
 

platform/vs/docker-sonic-vs.mk

@@ -34,6 +34,7 @@ endif
 
 $(DOCKER_SONIC_VS)_FILES += $(CONFIGDB_LOAD_SCRIPT) \
                             $(ARP_UPDATE_SCRIPT) \
+                            $(ARP_UPDATE_VARS_TEMPLATE) \
                             $(BUFFERS_CONFIG_TEMPLATE) \
                             $(QOS_CONFIG_TEMPLATE) \
                             $(SONIC_VERSION)

platform/vs/docker-sonic-vs/Dockerfile.j2

@@ -106,7 +106,7 @@ COPY ["start.sh", "orchagent.sh", "/usr/bin/"]
 COPY ["supervisord.conf", "/etc/supervisor/conf.d/"]
 COPY ["files/configdb-load.sh", "/usr/bin/"]
 COPY ["files/arp_update", "/usr/bin/"]
-COPY ["files/buffers_config.j2", "files/qos_config.j2", "/usr/share/sonic/templates/"]
+COPY ["files/buffers_config.j2", "files/qos_config.j2", "files/arp_update_vars.j2", "/usr/share/sonic/templates/"]
 COPY ["files/sonic_version.yml", "/etc/sonic/"]
 COPY ["database_config.json", "/etc/default/sonic-db/"]
 

rules/docker-orchagent.mk

@@ -35,4 +35,4 @@ $(DOCKER_ORCHAGENT)_RUN_OPT += -v /var/log/swss:/var/log/swss:rw
 
 $(DOCKER_ORCHAGENT)_BASE_IMAGE_FILES += swssloglevel:/usr/bin/swssloglevel
 $(DOCKER_ORCHAGENT)_BASE_IMAGE_FILES += monit_swss:/etc/monit/conf.d
-$(DOCKER_ORCHAGENT)_FILES += $(ARP_UPDATE_SCRIPT) $(SUPERVISOR_PROC_EXIT_LISTENER_SCRIPT)
+$(DOCKER_ORCHAGENT)_FILES += $(ARP_UPDATE_SCRIPT) $(ARP_UPDATE_VARS_TEMPLATE) $(SUPERVISOR_PROC_EXIT_LISTENER_SCRIPT)

rules/scripts.mk

@@ -2,6 +2,9 @@
 ARP_UPDATE_SCRIPT = arp_update
 $(ARP_UPDATE_SCRIPT)_PATH = files/scripts
 
+ARP_UPDATE_VARS_TEMPLATE = arp_update_vars.j2
+$(ARP_UPDATE_VARS_TEMPLATE)_PATH = files/build_templates
+
 CONFIGDB_LOAD_SCRIPT = configdb-load.sh
 $(CONFIGDB_LOAD_SCRIPT)_PATH = files/scripts
 
@@ -19,6 +22,7 @@ $(SYSCTL_NET_CONFIG)_PATH = files/image_config/sysctl
 
 SONIC_COPY_FILES += $(CONFIGDB_LOAD_SCRIPT) \
                     $(ARP_UPDATE_SCRIPT) \
+                    $(ARP_UPDATE_VARS_TEMPLATE) \
                     $(BUFFERS_CONFIG_TEMPLATE) \
                     $(QOS_CONFIG_TEMPLATE) \
                     $(SUPERVISOR_PROC_EXIT_LISTENER_SCRIPT) \