MTRIE Optimisations 2

1) 16-8-8 stride. Reduce trie depth walk traded with increased memory in the top PLY.
2) separate the vector of protocol-independent (PI) fib_table_t with the vector of protocol dependent (PD) FIBs. PD FIBs are large structures, we don't want to burn the memory for ech PD type
3) Go straight to the PD FIB in the data-path thus avoiding an indirection through, e.g., a PLY pool.

Change-Id: I800d1ed0b2049040d5da95213f3ed6b12bdd78b7
Signed-off-by: Neale Ranns <nranns@cisco.com>

1 files changed, 0 insertions, 21 deletions

diff --git a/src/vnet/ip/ip4_forward.c b/src/vnet/ip/ip4_forward.c
index ef6dded5dc7..ee1703e735e 100644
--- a/src/vnet/ip/ip4_forward.c
+++ b/src/vnet/ip/ip4_forward.c
@@ -182,7 +182,6 @@ ip4_lookup_inline (vlib_main_t * vm,
 	      mtrie2 = &ip4_fib_get (fib_index2)->mtrie;
 	      mtrie3 = &ip4_fib_get (fib_index3)->mtrie;
 
-
 	      leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, dst_addr0);
 	      leaf1 = ip4_fib_mtrie_lookup_step_one (mtrie1, dst_addr1);
 	      leaf2 = ip4_fib_mtrie_lookup_step_one (mtrie2, dst_addr2);
@@ -196,14 +195,6 @@ ip4_lookup_inline (vlib_main_t * vm,
 
 	  if (!lookup_for_responses_to_locally_received_packets)
 	    {
-	      leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, dst_addr0, 1);
-	      leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1, dst_addr1, 1);
-	      leaf2 = ip4_fib_mtrie_lookup_step (mtrie2, leaf2, dst_addr2, 1);
-	      leaf3 = ip4_fib_mtrie_lookup_step (mtrie3, leaf3, dst_addr3, 1);
-	    }
-
-	  if (!lookup_for_responses_to_locally_received_packets)
-	    {
 	      leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, dst_addr0, 2);
 	      leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1, dst_addr1, 2);
 	      leaf2 = ip4_fib_mtrie_lookup_step (mtrie2, leaf2, dst_addr2, 2);
@@ -364,9 +355,6 @@ ip4_lookup_inline (vlib_main_t * vm,
 	  tcp0 = (void *) (ip0 + 1);
 
 	  if (!lookup_for_responses_to_locally_received_packets)
-	    leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, dst_addr0, 1);
-
-	  if (!lookup_for_responses_to_locally_received_packets)
 	    leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, dst_addr0, 2);
 
 	  if (!lookup_for_responses_to_locally_received_packets)
@@ -1622,11 +1610,6 @@ ip4_local_inline (vlib_main_t * vm,
 	  good_tcp_udp0 |= is_udp0 && udp0->checksum == 0;
 	  good_tcp_udp1 |= is_udp1 && udp1->checksum == 0;
 
-	  leaf0 =
-	    ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 1);
-	  leaf1 =
-	    ip4_fib_mtrie_lookup_step (mtrie1, leaf1, &ip1->src_address, 1);
-
 	  /* Verify UDP length. */
 	  ip_len0 = clib_net_to_host_u16 (ip0->length);
 	  ip_len1 = clib_net_to_host_u16 (ip1->length);
@@ -1812,9 +1795,6 @@ ip4_local_inline (vlib_main_t * vm,
 	  /* Don't verify UDP checksum for packets with explicit zero checksum. */
 	  good_tcp_udp0 |= is_udp0 && udp0->checksum == 0;
 
-	  leaf0 =
-	    ip4_fib_mtrie_lookup_step (mtrie0, leaf0, &ip0->src_address, 1);
-
 	  /* Verify UDP length. */
 	  ip_len0 = clib_net_to_host_u16 (ip0->length);
 	  udp_len0 = clib_net_to_host_u16 (udp0->length);
@@ -2913,7 +2893,6 @@ ip4_lookup_validate (ip4_address_t * a, u32 fib_index0)
   mtrie0 = &ip4_fib_get (fib_index0)->mtrie;
 
   leaf0 = ip4_fib_mtrie_lookup_step_one (mtrie0, a);
-  leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, a, 1);
   leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, a, 2);
   leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, a, 3);