MTU: Software interface / Per-protocol MTU support

This patch separates setting of hardware interfaec and software
interface MTU. Software MTU is L2 payload MTU (i.e. not including L2
header). Per-protocol MTU for IPv4, IPv6 and MPLS can also be set.
Currently only IP4, IP6 are enabled in adjacency / rewrite code.

Documentation in src/vnet/MTU.md

Change-Id: Iee2fd6f0bbc8210748dd8e073ab9fab87d323690
Signed-off-by: Ole Troan <ot@cisco.com>

1 files changed, 17 insertions, 3 deletions

diff --git a/src/vnet/interface.api b/src/vnet/interface.api
index 25ba70342ee..2cbf4f68dbc 100644
--- a/src/vnet/interface.api
+++ b/src/vnet/interface.api
@@ -1,4 +1,4 @@
-option version = "1.1.0";
+option version = "2.0.0";
 
 service {
   rpc want_interface_events returns want_interface_events_reply
@@ -21,13 +21,13 @@ autoreply define sw_interface_set_flags
   u8 admin_up_down;
 };
 
-/** \brief Set interface MTU
+/** \brief Set interface physical MTU
     @param client_index - opaque cookie to identify the sender
     @param context - sender context, to match reply w/ request
     @param sw_if_index - index of the interface to set MTU on
     @param mtu - MTU
 */
-autoreply define sw_interface_set_mtu
+autoreply define hw_interface_set_mtu
 {
   u32 client_index;
   u32 context;
@@ -35,6 +35,17 @@ autoreply define sw_interface_set_mtu
   u16 mtu;
 };
 
+/** \brief Set interface L3 MTU */
+autoreply define sw_interface_set_mtu
+{
+  u32 client_index;
+  u32 context;
+  u32 sw_if_index;
+  /* $$$$ Replace with enum */
+  u32 mtu[4]; /* 0 - L3, 1 - IP4, 2 - IP6, 3 - MPLS */
+};
+
+
 /** \brief Interface Event generated by want_interface_events
     @param client_index - opaque cookie to identify the sender
     @param pid - client pid registered to receive notification
@@ -125,6 +136,9 @@ define sw_interface_details
   /* MTU */
   u16 link_mtu;
 
+  /* Per protocol MTUs */
+  u32 mtu[4]; /* 0 - L3, 1 - IP4, 2 - IP6, 3 - MPLS */
+
   /* Subinterface ID. A number 0-N to uniquely identify this subinterface under the super interface */
   u32 sub_id;