commit ffd78d1ef8fe80d1b756a71d42d5eadda60ae996
author Neale Ranns <neale.ranns@cisco.com> Fri Feb 09 06:05:16 2018 -0800
committer Damjan Marion <dmarion.lists@gmail.com> Mon Feb 12 11:23:33 2018 +0000
tree 99770e8773a7c3dd27c8b9b116edb6a39ace09ea
parent 2d6f66e1748be190664cbd72c826db32616d759a

Improve MTU handling

- setting MTU on an interface updates the L3 max bytes too
- value cached in the adjacency is also updated
- MTU exceeded generates ICMP to sender

Change-Id: I343ec71d8e903b529594c4bd0543f04bc7f370b3
Signed-off-by: Neale Ranns <neale.ranns@cisco.com>

src/vnet/interface_cli.c

diff --git a/src/vnet/interface_cli.c b/src/vnet/interface_cli.c
index 5509e3f..8880d97 100644
--- a/src/vnet/interface_cli.c
+++ b/src/vnet/interface_cli.c
@@ -1132,7 +1132,6 @@
 {
   vnet_main_t *vnm = vnet_get_main ();
   u32 hw_if_index, mtu;
-  u32 flags = ETHERNET_INTERFACE_FLAG_MTU;
   ethernet_main_t *em = &ethernet_main;
 
   if (unformat (input, "%d %U", &mtu,
@@ -1153,11 +1152,7 @@
 	return clib_error_return (0, "Invalid mtu (%d): must be <= (%d)", mtu,
 				  hi->max_supported_packet_bytes);
 
-      if (hi->max_packet_bytes != mtu)
-	{
-	  hi->max_packet_bytes = mtu;
-	  ethernet_set_flags (vnm, hw_if_index, flags);
-	}
+      vnet_hw_interface_set_mtu (vnm, hw_if_index, mtu);
     }
   else
     return clib_error_return (0, "unknown input `%U'",