Reduce MAC caching timeout when using probed VFs

In order to use RDMA for iSER, storage network is configured
over virtual function, in the Ethernet case.
VFs doesn't have a permanent MAC, so this change comes to reduce
the MAC caching time in order to support a reboot of servers in
the cluster with VFs that changing their MAC (e.g storage targets).

Change-Id: I2effceebf40d94598c9fe0308873064b0592234f

deployment_scripts/sriov.sh

@@ -19,6 +19,8 @@ source $SCRIPT_DIR/common
 readonly SCRIPT_MODE=$1
 readonly FALLBACK_NUM_VFS=8
 readonly SRIOV_ENABLED_FLAG=1
+readonly VF_MAC_CACHING_TIMEOUT=1
+readonly VF_MAC_CACHING_TIMEOUT_DEF=300
 readonly NEW_KERNEL_PARAM="intel_iommu=on"
 readonly GRUB_FILE_CENTOS="/boot/grub/grub.conf"
 readonly GRUB_FILE_UBUNTU="/boot/grub/grub.cfg"
@@ -66,6 +68,19 @@ function calculate_total_vfs () {
   echo ${num_of_vfs}
 }
 
+# Reduce mac caching time since VF is used for iSER with non permanent MAC
+function reduce_mac_caching_timeout () {
+  probes=`get_num_probe_vfs`
+  if [ "$probes" == "1" ]; then
+    timeout=$VF_MAC_CACHING_TIMEOUT
+  else
+    timeout=$VF_MAC_CACHING_TIMEOUT_DEF
+  fi
+  sed -e "/^.*net\.ipv4\.route\.gc_timeout.*$/d" -i /etc/sysctl.conf
+  echo "net.ipv4.route.gc_timeout=$timeout" >> /etc/sysctl.conf
+  sysctl -p
+}
+
 function set_modprobe_file () {
   PROBE_VFS=`get_num_probe_vfs`
   MLX4_CORE_FILE="/etc/modprobe.d/mlx4_core.conf"
@@ -104,6 +119,7 @@ function set_kernel_params () {
     # insert the corrected line on the same line number
     sed -i "${line_num}i\ ${new_kernel_line}" ${grub_file}
   fi
+  reduce_mac_caching_timeout
 }
 
 function burn_vfs_in_fw () {

metadata.yaml

@@ -5,7 +5,7 @@ name: mellanox-plugin
 title: Mellanox Openstack features
 
 # Plugin version
-version: 0.2.23
+version: 0.2.24
 
 # Description
 description: Enable features over Mellanox hardware