Re: [Xen-devel] Backport request for "tools/hotplug: set mtu from bridge for tap interface" - for Xen 4.3

["Charles Arnold" <carnold@xxxxxxxx>]

With changeset 22885 support was added for setting the MTU in the vif-bridge
script for when a vif interface was set to 'online'.  The was not done for the
'add' operation.  The 'add' operation was added to the script for when tap
devices were specified (c/s 21944). With the setting of the MTU for the
'online' case was there a reason for omitting the 'add'?

This patch sets the MTU for both 'online' and 'add' in the vif-bridge script.

Backport for Xen version 4.3

Signed-off-by: Charles Arnold <carnold@xxxxxxxx>

diff --git a/tools/hotplug/Linux/vif-bridge b/tools/hotplug/Linux/vif-bridge
index f489519..da8a0f8 100644
--- a/tools/hotplug/Linux/vif-bridge
+++ b/tools/hotplug/Linux/vif-bridge
@@ -82,11 +82,7 @@ fi
 case "$command" in
     online)
         setup_virtual_bridge_port "$dev"
-        mtu="`ip link show $bridge | awk '/mtu/ { print $5 }'`"
-        if [ -n "$mtu" ] && [ "$mtu" -gt 0 ]
-        then
-                ip link set $dev mtu $mtu || :
-        fi
+        set_mtu "$bridge" "$dev"
         add_to_bridge "$bridge" "$dev"
         ;;
 
@@ -97,6 +93,7 @@ case "$command" in
 
     add)
         setup_virtual_bridge_port "$dev"
+        set_mtu "$bridge" "$dev"
         add_to_bridge "$bridge" "$dev"
         ;;
 esac
diff --git a/tools/hotplug/Linux/xen-network-common.sh 
b/tools/hotplug/Linux/xen-network-common.sh
index 8cff156..9a9526b 100644
--- a/tools/hotplug/Linux/xen-network-common.sh
+++ b/tools/hotplug/Linux/xen-network-common.sh
@@ -132,3 +132,14 @@ add_to_bridge () {
     ip link set ${dev} up
 }
 
+# Usage: set_mtu bridge dev
+set_mtu () {
+    local bridge=$1
+    local dev=$2
+    mtu="`ip link show ${bridge}| awk '/mtu/ { print $5 }'`"
+    if [ -n "$mtu" ] && [ "$mtu" -gt 0 ]
+    then
+            ip link set ${dev} mtu $mtu || :
+    fi
+}
+



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