Add NIC offload disable feature

On some ubuntu kernels with some versions
of Openvswitch and Nicira, when NIC offloading
is enabled on the adapter, the kernel may OOPS
within the openvswitch module.  There is now a flag
to attempt to disable all offload settings for the
adapter prior to openvswitch service startup.

Change-Id: I61b195c69fbb827876de1c3537cece01f36c6db0

attributes/default.rb

@@ -72,6 +72,12 @@ default["openstack"]["network"]["api"]["bind_port"] = 9696
 # logging attribute
 default["openstack"]["network"]["syslog"]["use"] = false
 
+# Whether or not we want to disable offloading
+# on all the NIC interfaces (currently only supports
+# ubuntu and debian).  This can help if openvswitch
+# or nicira plugins are crashing the sdn routers
+default['openstack']['network']['disable_offload'] = false
+
 # the plugins to install on the server.  this will be
 # quantum-plugin-%plugin% and the first plugin in the
 # list should match the core plugin below

files/default/disable-eth-offload.sh

@@ -0,0 +1,78 @@
+#!/usr/bin/env bash
+#
+# Copyright (C) 2013 ATT Services, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at:
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+### BEGIN INIT INFO
+# Provides:          disable-eth-offload
+# Required-Start:    $network
+# Required-Stop:     $remote_fs
+# Default-Start:     2 3 4 5
+# Default-Stop:      0 1 6
+# Short-Description: Disable NIC Offloads
+### END INIT INFO
+
+function check_setting() {
+  setting_on="false"
+  INTERFACE=$1
+  SETTING=$2
+  if [ -z $INTERFACE ] || [ -z $SETTING ]; then
+    echo "You didn't call check_setting right, it needs interfaces as \$1 and setting as \$2"
+    exit 1
+  fi
+
+  if [ $LOGGING == "true" ]; then
+    ethtool -k $INTERFACE | grep $SETTING | grep ": on"
+  fi
+
+  ethtool -k $INTERFACE | grep $SETTING | grep ": on" > /dev/null
+  if [ $? == 0 ]; then
+    setting_on="true"
+  fi
+}
+
+start () {
+
+    INTERFACES=$( grep auto /etc/network/interfaces | grep -v lo | awk '{ print $NF }' )
+    declare -A SETTINGS
+    SETTINGS=( ["lro"]="large-receive-offload" ["tso"]="tcp-segmentation-offload" ["gso"]="generic-segmentation-offload" ["gro"]="generic-receive-offload" )
+    ETHTOOL_BIN="/sbin/ethtool"
+    LOGGING="false"
+    setting_on="false"
+
+    for interface in $INTERFACES; do
+      for setting in "${!SETTINGS[@]}"; do
+        check_setting $interface ${SETTINGS[$setting]}
+        if [ $setting_on == "true" ]; then
+          $ETHTOOL_BIN -K $interface $setting off
+          if [ $LOGGING == "true" ]; then
+            echo "RUNNING: $ETHTOOL_BIN -K $interface $setting off"
+          fi
+        fi
+      done
+    done
+}
+
+case $1 in
+    start)
+        start
+        ;;
+    *)
+        echo "Usage: $0 {start}" >&2
+        exit 1
+        ;;
+esac
+
+exit 0
+

recipes/openvswitch.rb

@@ -99,3 +99,29 @@ if not ["nicira", "plumgrid", "bigswitch"].include?(main_plugin)
     notifies :restart, "service[quantum-plugin-openvswitch-agent]", :delayed
   end
 end
+
+if node['openstack']['network']['disable_offload']
+
+  package "ethtool" do
+    action :install
+    options platform_options["package_overrides"]
+  end
+
+  service "disable-eth-offload" do
+    supports :restart => false, :start => true, :stop => false, :reload => false
+    priority({ 2 => [ :start, 19 ]})
+    action :nothing
+  end
+
+  # a priority of 19 ensures we start before openvswitch
+  # at least on ubuntu and debian
+  cookbook_file "disable-eth-offload-script" do
+    path "/etc/init.d/disable-eth-offload"
+    source "disable-eth-offload.sh"
+    owner "root"
+    group "root"
+    mode "0755"
+    notifies :enable, "service[disable-eth-offload]"
+    notifies :start, "service[disable-eth-offload]"
+  end
+end