fib: fib api updates

Enhance the route add/del APIs to take a set of paths rather than just one.
Most unicast routing protocols calcualte all the available paths in one
run of the algorithm so updating all the paths at once is beneficial for the client.
two knobs control the behaviour:
  is_multipath - if set the the set of paths passed will be added to those
                 that already exist, otherwise the set will replace them.
  is_add - add or remove the set

is_add=0, is_multipath=1 and an empty set, results in deleting the route.

It is also considerably faster to add multiple paths at once, than one at a time:

vat# ip_add_del_route 1.1.1.1/32 count 100000 multipath via 10.10.10.11
100000 routes in .572240 secs, 174751.80 routes/sec
vat# ip_add_del_route 1.1.1.1/32 count 100000 multipath via 10.10.10.12
100000 routes in .528383 secs, 189256.54 routes/sec
vat# ip_add_del_route 1.1.1.1/32 count 100000 multipath via 10.10.10.13
100000 routes in .757131 secs, 132077.52 routes/sec
vat# ip_add_del_route 1.1.1.1/32 count 100000 multipath via 10.10.10.14
100000 routes in .878317 secs, 113854.12 routes/sec

vat# ip_route_add_del 1.1.1.1/32 count 100000 multipath via 10.10.10.11 via 10.10.10.12 via 10.10.10.13 via 10.10.10.14
100000 routes in .900212 secs, 111084.93 routes/sec

Change-Id: I416b93f7684745099c1adb0b33edac58c9339c1a
Signed-off-by: Neale Ranns <neale.ranns@cisco.com>
Signed-off-by: Ole Troan <ot@cisco.com>
Signed-off-by: Paul Vinciguerra <pvinci@vinciconsulting.com>

1 files changed, 13 insertions, 8 deletions

diff --git a/test/test_vxlan.py b/test/test_vxlan.py
index aa069dc6e7b..c74efe7d062 100644
--- a/test/test_vxlan.py
+++ b/test/test_vxlan.py
@@ -10,6 +10,8 @@ from scapy.layers.l2 import Ether, Raw
 from scapy.layers.inet import IP, UDP
 from scapy.layers.vxlan import VXLAN
 from scapy.utils import atol
+from vpp_ip_route import VppIpRoute, VppRoutePath
+from vpp_ip import INVALID_INDEX
 
 
 class TestVxlan(BridgeDomain, VppTestCase):
@@ -84,17 +86,20 @@ class TestVxlan(BridgeDomain, VppTestCase):
         # Create 10 ucast vxlan tunnels under bd
         ip_range_start = 10
         ip_range_end = ip_range_start + n_ucast_tunnels
-        next_hop_address = cls.pg0.remote_ip4n
-        for dest_ip4n in ip4n_range(next_hop_address, ip_range_start,
-                                    ip_range_end):
+        next_hop_address = cls.pg0.remote_ip4
+        for dest_ip4 in ip4_range(next_hop_address, ip_range_start,
+                                  ip_range_end):
             # add host route so dest_ip4n will not be resolved
-            cls.vapi.ip_add_del_route(dst_address=dest_ip4n,
-                                      dst_address_length=32,
-                                      next_hop_address=next_hop_address)
+            rip = VppIpRoute(cls, dest_ip4, 32,
+                             [VppRoutePath(next_hop_address,
+                                           INVALID_INDEX)],
+                             register=False)
+            rip.add_vpp_config()
+            dest_ip4n = socket.inet_pton(socket.AF_INET, dest_ip4)
+
             r = cls.vapi.vxlan_add_del_tunnel(src_address=cls.pg0.local_ip4n,
                                               dst_address=dest_ip4n, vni=vni)
-            cls.vapi.sw_interface_set_l2_bridge(rx_sw_if_index=r.sw_if_index,
-                                                bd_id=vni)
+            cls.vapi.sw_interface_set_l2_bridge(r.sw_if_index, bd_id=vni)
 
     @classmethod
     def add_del_shared_mcast_dst_load(cls, is_add):