commit d723161e038d00e59766aa67a6a0dcc350227e4b
author Ole Troan <ot@cisco.com> Thu Jun 07 10:17:57 2018 +0200
committer Damjan Marion <dmarion@me.com> Mon Jun 11 10:25:59 2018 +0000
tree 24f5a1d87ebdc0012f28d42aa80a9f5d760073bf
parent f4fd0d4217ab6c41fe6b093871bd40ac130e6486

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>

src/vnet/sctp/sctp.c

diff --git a/src/vnet/sctp/sctp.c b/src/vnet/sctp/sctp.c
index 6e2dccc..ffa8634 100644
--- a/src/vnet/sctp/sctp.c
+++ b/src/vnet/sctp/sctp.c
@@ -43,8 +43,12 @@
   ip_copy (&listener->sub_conn[SCTP_PRIMARY_PATH_IDX].connection.lcl_ip,
 	   &tep->ip, tep->is_ip4);
 
-  listener->sub_conn[SCTP_PRIMARY_PATH_IDX].PMTU =
-    vnet_sw_interface_get_mtu (vnet_get_main (), tep->sw_if_index, VLIB_TX);
+  u32 mtu = tep->is_ip4 ? vnet_sw_interface_get_mtu (vnet_get_main (),
+						     tep->sw_if_index,
+						     VNET_MTU_IP4) :
+    vnet_sw_interface_get_mtu (vnet_get_main (), tep->sw_if_index,
+			       VNET_MTU_IP6);
+  listener->sub_conn[SCTP_PRIMARY_PATH_IDX].PMTU = mtu;
   listener->sub_conn[SCTP_PRIMARY_PATH_IDX].connection.is_ip4 = tep->is_ip4;
   listener->sub_conn[SCTP_PRIMARY_PATH_IDX].connection.proto =
     TRANSPORT_PROTO_SCTP;
@@ -480,8 +484,12 @@
 
   clib_spinlock_lock_if_init (&tm->half_open_lock);
   sctp_conn = sctp_half_open_connection_new (thread_id);
-  sctp_conn->sub_conn[idx].PMTU =
-    vnet_sw_interface_get_mtu (vnet_get_main (), rmt->sw_if_index, VLIB_TX);
+  u32 mtu = rmt->is_ip4 ? vnet_sw_interface_get_mtu (vnet_get_main (),
+						     rmt->sw_if_index,
+						     VNET_MTU_IP4) :
+    vnet_sw_interface_get_mtu (vnet_get_main (), rmt->sw_if_index,
+			       VNET_MTU_IP6);
+  sctp_conn->sub_conn[idx].PMTU = mtu;
 
   transport_connection_t *trans_conn = &sctp_conn->sub_conn[idx].connection;
   ip_copy (&trans_conn->rmt_ip, &rmt->ip, rmt->is_ip4);