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, 12 insertions, 12 deletions

diff --git a/src/vnet/fib/fib_entry.c b/src/vnet/fib/fib_entry.c
index edbfdf6e3a4..6ff692dea98 100644
--- a/src/vnet/fib/fib_entry.c
+++ b/src/vnet/fib/fib_entry.c
@@ -906,21 +906,19 @@ void
 fib_entry_path_add (fib_node_index_t fib_entry_index,
 		    fib_source_t source,
 		    fib_entry_flag_t flags,
-		    const fib_route_path_t *rpath)
+		    const fib_route_path_t *rpaths)
 {
     fib_source_t best_source;
     fib_entry_t *fib_entry;
     fib_entry_src_t *bsrc;
 
-    ASSERT(1 == vec_len(rpath));
-
     fib_entry = fib_entry_get(fib_entry_index);
     ASSERT(NULL != fib_entry);
 
     bsrc = fib_entry_get_best_src_i(fib_entry);
     best_source = fib_entry_src_get_source(bsrc);
     
-    fib_entry = fib_entry_src_action_path_add(fib_entry, source, flags, rpath);
+    fib_entry = fib_entry_src_action_path_add(fib_entry, source, flags, rpaths);
 
     fib_entry_source_change(fib_entry, best_source, source);
 
@@ -1003,7 +1001,7 @@ fib_entry_source_removed (fib_entry_t *fib_entry,
 fib_entry_src_flag_t
 fib_entry_path_remove (fib_node_index_t fib_entry_index,
 		       fib_source_t source,
-		       const fib_route_path_t *rpath)
+		       const fib_route_path_t *rpaths)
 {
     fib_entry_src_flag_t sflag;
     fib_source_t best_source;
@@ -1011,8 +1009,6 @@ fib_entry_path_remove (fib_node_index_t fib_entry_index,
     fib_entry_t *fib_entry;
     fib_entry_src_t *bsrc;
 
-    ASSERT(1 == vec_len(rpath));
-
     fib_entry = fib_entry_get(fib_entry_index);
     ASSERT(NULL != fib_entry);
 
@@ -1020,7 +1016,7 @@ fib_entry_path_remove (fib_node_index_t fib_entry_index,
     best_source = fib_entry_src_get_source(bsrc);
     bflags = fib_entry_src_get_flags(bsrc);
 
-    sflag = fib_entry_src_action_path_remove(fib_entry, source, rpath);
+    sflag = fib_entry_src_action_path_remove(fib_entry, source, rpaths);
 
     FIB_ENTRY_DBG(fib_entry, "path remove:%U", format_fib_source, source);
 
@@ -1648,11 +1644,13 @@ fib_entry_module_init (void)
     fib_entry_logger = vlib_log_register_class("fib", "entry");
 }
 
-void
-fib_entry_encode (fib_node_index_t fib_entry_index,
-		  fib_route_path_encode_t **api_rpaths)
+fib_route_path_t *
+fib_entry_encode (fib_node_index_t fib_entry_index)
 {
     fib_path_ext_list_t *ext_list;
+    fib_path_encode_ctx_t ctx = {
+        .rpaths = NULL,
+    };
     fib_entry_t *fib_entry;
     fib_entry_src_t *bsrc;
 
@@ -1670,8 +1668,10 @@ fib_entry_encode (fib_node_index_t fib_entry_index,
         fib_path_list_walk_w_ext(fib_entry->fe_parent,
                                  ext_list,
                                  fib_path_encode,
-                                 api_rpaths);
+                                 &ctx);
     }
+
+    return (ctx.rpaths);
 }
 
 const fib_prefix_t *