From 7b5c7dce53ab9e9778d1d72fcbbed565bfce65bd Mon Sep 17 00:00:00 2001
From: Ihar Hrachyshka <ihrachys@redhat.com>
Date: Fri, 15 Jul 2016 20:17:13 +0200
Subject: [PATCH] Introduce PUBLIC_BRIDGE_MTU variable to set br-ex MTU

This variable can be used to accommodate for underlying infrastructure
that does not provide full 1500-sized traffic, or maybe instead gives
access to Jumbo frames.

Change-Id: I38a80bac18673a30842a7b997d0669fed5aff976
Related-Bug: #1603268
---
 functions                             | 9 +++++++++
 lib/neutron_plugins/linuxbridge_agent | 1 +
 lib/neutron_plugins/openvswitch_agent | 2 +-
 lib/neutron_plugins/ovs_base          | 7 ++++++-
 lib/neutron_plugins/services/l3       | 1 +
 5 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/functions b/functions
index 4f5e10aaa6..58565788ff 100644
--- a/functions
+++ b/functions
@@ -637,6 +637,15 @@ function create_disk {
     fi
 }
 
+
+# set_mtu - Set MTU on a device
+function set_mtu {
+    local dev=$1
+    local mtu=$2
+    sudo ip link set mtu $mtu dev $dev
+}
+
+
 # Restore xtrace
 $_XTRACE_FUNCTIONS
 
diff --git a/lib/neutron_plugins/linuxbridge_agent b/lib/neutron_plugins/linuxbridge_agent
index 0a066354ca..e5a7b76187 100644
--- a/lib/neutron_plugins/linuxbridge_agent
+++ b/lib/neutron_plugins/linuxbridge_agent
@@ -50,6 +50,7 @@ function neutron_plugin_configure_dhcp_agent {
 function neutron_plugin_configure_l3_agent {
     local conf_file=$1
     sudo brctl addbr $PUBLIC_BRIDGE
+    set_mtu $PUBLIC_BRIDGE $PUBLIC_BRIDGE_MTU
     iniset $conf_file DEFAULT external_network_bridge
     iniset $conf_file DEFAULT l3_agent_manager neutron.agent.l3_agent.L3NATAgentWithStateReport
 }
diff --git a/lib/neutron_plugins/openvswitch_agent b/lib/neutron_plugins/openvswitch_agent
index 69e38f4df1..b4a53e4c38 100644
--- a/lib/neutron_plugins/openvswitch_agent
+++ b/lib/neutron_plugins/openvswitch_agent
@@ -104,7 +104,7 @@ function neutron_plugin_configure_plugin_agent {
         sudo ovs-vsctl -- --may-exist add-port "br-$VLAN_INTERFACE" $VLAN_INTERFACE
 
         # Create external bridge and add port
-        _neutron_ovs_base_add_bridge $PUBLIC_BRIDGE
+        _neutron_ovs_base_add_public_bridge
         sudo ovs-vsctl -- --may-exist add-port $PUBLIC_BRIDGE $PUBLIC_INTERFACE
 
         # Set bridge mappings to "physnet1:br-$GUEST_INTERFACE_DEFAULT"
diff --git a/lib/neutron_plugins/ovs_base b/lib/neutron_plugins/ovs_base
index ecf252f88b..9e1421f5e6 100644
--- a/lib/neutron_plugins/ovs_base
+++ b/lib/neutron_plugins/ovs_base
@@ -105,11 +105,16 @@ function _neutron_ovs_base_configure_l3_agent {
         sudo ip link set $Q_PUBLIC_VETH_EX up
         sudo ip addr flush dev $Q_PUBLIC_VETH_EX
     else
-        _neutron_ovs_base_add_bridge $PUBLIC_BRIDGE
+        _neutron_ovs_base_add_public_bridge
         sudo ovs-vsctl br-set-external-id $PUBLIC_BRIDGE bridge-id $PUBLIC_BRIDGE
     fi
 }
 
+function _neutron_ovs_base_add_public_bridge {
+    _neutron_ovs_base_add_bridge $PUBLIC_BRIDGE
+    set_mtu $PUBLIC_BRIDGE $PUBLIC_BRIDGE_MTU
+}
+
 function _neutron_ovs_base_configure_nova_vif_driver {
     :
 }
diff --git a/lib/neutron_plugins/services/l3 b/lib/neutron_plugins/services/l3
index 4ce87bdf6f..2180099ee4 100644
--- a/lib/neutron_plugins/services/l3
+++ b/lib/neutron_plugins/services/l3
@@ -15,6 +15,7 @@ IPV6_PROVIDER_FIXED_RANGE=${IPV6_PROVIDER_FIXED_RANGE:-}
 IPV6_PROVIDER_NETWORK_GATEWAY=${IPV6_PROVIDER_NETWORK_GATEWAY:-}
 
 PUBLIC_BRIDGE=${PUBLIC_BRIDGE:-br-ex}
+PUBLIC_BRIDGE_MTU=${PUBLIC_BRIDGE_MTU:-1500}
 
 # If Q_USE_PUBLIC_VETH=True, create and use a veth pair instead of
 # PUBLIC_BRIDGE.  This is intended to be used with