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, 4 insertions, 5 deletions

diff --git a/test/test_reassembly.py b/test/test_reassembly.py
index 26ff7486b92..6a356a00b0c 100644
--- a/test/test_reassembly.py
+++ b/test/test_reassembly.py
@@ -17,7 +17,7 @@ from framework import VppTestCase, VppTestRunner
 from util import ppp, fragment_rfc791, fragment_rfc8200
 from vpp_gre_interface import VppGreInterface
 from vpp_ip import DpoProto
-from vpp_ip_route import VppIpRoute, VppRoutePath
+from vpp_ip_route import VppIpRoute, VppRoutePath, FibPathProto
 
 # 35 is enough to have >257 400-byte fragments
 test_packet_count = 35
@@ -1203,10 +1203,9 @@ class TestFIFReassembly(VppTestCase):
             sw_if_index=self.gre6.sw_if_index, enable_ip6=True)
 
         self.route6 = VppIpRoute(self, self.tun_ip6, 128,
-                                 [VppRoutePath(self.src_if.remote_ip6,
-                                               self.src_if.sw_if_index,
-                                               proto=DpoProto.DPO_PROTO_IP6)],
-                                 is_ip6=1)
+                                 [VppRoutePath(
+                                     self.src_if.remote_ip6,
+                                     self.src_if.sw_if_index)])
         self.route6.add_vpp_config()
 
         self.reset_packet_infos()