BIER

- see draft-ietf-bier-mpls-encapsulation-10
- midpoint, head and tail functions
- supported payload protocols; IPv4 and IPv6 only.

Change-Id: I59d7363bb6fdfdce8e4016a68a9c8f5a5e5791cb
Signed-off-by: Neale Ranns <nranns@cisco.com>

5 files changed, 86 insertions, 12 deletions

diff --git a/src/vnet/dpo/dpo.c b/src/vnet/dpo/dpo.c
index 7658132d47a..1ee0727135d 100644
--- a/src/vnet/dpo/dpo.c
+++ b/src/vnet/dpo/dpo.c
@@ -122,6 +122,7 @@ dpo_proto_to_link (dpo_proto_t dp)
     case DPO_PROTO_IP4:
         return (VNET_LINK_IP4);
     case DPO_PROTO_MPLS:
+    case DPO_PROTO_BIER:
         return (VNET_LINK_MPLS);
     case DPO_PROTO_ETHERNET:
         return (VNET_LINK_ETHERNET);
diff --git a/src/vnet/dpo/dpo.h b/src/vnet/dpo/dpo.h
index 304b4331495..27c129ed444 100644
--- a/src/vnet/dpo/dpo.h
+++ b/src/vnet/dpo/dpo.h
@@ -63,6 +63,7 @@ typedef enum dpo_proto_t_
     DPO_PROTO_IP6,
     DPO_PROTO_MPLS,
     DPO_PROTO_ETHERNET,
+    DPO_PROTO_BIER,
     DPO_PROTO_NSH,
 } __attribute__((packed)) dpo_proto_t;
 
@@ -75,6 +76,7 @@ typedef enum dpo_proto_t_
     [DPO_PROTO_ETHERNET]  = "ethernet", \
     [DPO_PROTO_MPLS] = "mpls",	\
     [DPO_PROTO_NSH] = "nsh",    \
+    [DPO_PROTO_BIER] = "bier",	\
 }
 
 #define FOR_EACH_DPO_PROTO(_proto)    \
@@ -116,6 +118,11 @@ typedef enum dpo_type_t_ {
     DPO_INTERFACE_TX,
     DPO_L2_BRIDGE,
     DPO_L3_PROXY,
+    DPO_BIER_TABLE,
+    DPO_BIER_FMASK,
+    DPO_BIER_IMP,
+    DPO_BIER_DISP_TABLE,
+    DPO_BIER_DISP_ENTRY,
     DPO_LAST,
 } __attribute__((packed)) dpo_type_t;
 
@@ -145,6 +152,11 @@ typedef enum dpo_type_t_ {
     [DPO_INTERFACE_TX] = "dpo-interface-tx",	\
     [DPO_L2_BRIDGE] = "dpo-l2-bridge",	\
     [DPO_L3_PROXY] = "dpo-l3-proxy",	\
+    [DPO_BIER_TABLE] = "bier-table",	\
+    [DPO_BIER_FMASK] = "bier-fmask",	\
+    [DPO_BIER_IMP] = "bier-imposition",	\
+    [DPO_BIER_DISP_ENTRY] = "bier-disp-entry",	\
+    [DPO_BIER_DISP_TABLE] = "bier-disp-table",	\
 }
 
 /**
diff --git a/src/vnet/dpo/drop_dpo.c b/src/vnet/dpo/drop_dpo.c
index a1821dddfcc..6bb3ff7d5e0 100644
--- a/src/vnet/dpo/drop_dpo.c
+++ b/src/vnet/dpo/drop_dpo.c
@@ -96,6 +96,11 @@ const static char* const drop_nsh_nodes[] =
     "error-drop",
     NULL,
 };
+const static char* const drop_bier_nodes[] =
+{
+    "bier-drop",
+    NULL,
+};
 const static char* const * const drop_nodes[DPO_PROTO_NUM] =
 {
     [DPO_PROTO_IP4]  = drop_ip4_nodes,
@@ -103,6 +108,7 @@ const static char* const * const drop_nodes[DPO_PROTO_NUM] =
     [DPO_PROTO_MPLS] = drop_mpls_nodes,
     [DPO_PROTO_ETHERNET] = drop_ethernet_nodes,
     [DPO_PROTO_NSH] = drop_nsh_nodes,
+    [DPO_PROTO_BIER] = drop_bier_nodes,
 };
 
 void
diff --git a/src/vnet/dpo/load_balance.c b/src/vnet/dpo/load_balance.c
index af054f1c3f4..b48702ae3f2 100644
--- a/src/vnet/dpo/load_balance.c
+++ b/src/vnet/dpo/load_balance.c
@@ -21,6 +21,7 @@
 #include <vnet/adj/adj.h>
 #include <vnet/adj/adj_internal.h>
 #include <vnet/fib/fib_urpf_list.h>
+#include <vnet/bier/bier_hdr_inlines.h>
 
 /*
  * distribution error tolerance for load-balancing
@@ -814,6 +815,10 @@ const static char* const load_balance_l2_nodes[] =
 const static char* const load_balance_nsh_nodes[] =
 {
     "nsh-load-balance",
+};
+const static char* const load_balance_bier_nodes[] =
+{
+    "bier-load-balance",
     NULL,
 };
 const static char* const * const load_balance_nodes[DPO_PROTO_NUM] =
@@ -823,6 +828,7 @@ const static char* const * const load_balance_nodes[DPO_PROTO_NUM] =
     [DPO_PROTO_MPLS] = load_balance_mpls_nodes,
     [DPO_PROTO_ETHERNET] = load_balance_l2_nodes,
     [DPO_PROTO_NSH] = load_balance_nsh_nodes,
+    [DPO_PROTO_BIER] = load_balance_bier_nodes,
 };
 
 void
@@ -935,10 +941,11 @@ typedef struct load_balance_trace_t_
     index_t lb_index;
 } load_balance_trace_t;
 
-static uword
-l2_load_balance (vlib_main_t * vm,
-		 vlib_node_runtime_t * node,
-		 vlib_frame_t * frame)
+always_inline uword
+load_balance_inline (vlib_main_t * vm,
+		     vlib_node_runtime_t * node,
+		     vlib_frame_t * frame,
+		     int is_l2)
 {
   u32 n_left_from, next_index, *from, *to_next;
 
@@ -973,7 +980,16 @@ l2_load_balance (vlib_main_t * vm,
 	  lbi0 =  vnet_buffer (b0)->ip.adj_index[VLIB_TX];
 	  lb0 = load_balance_get(lbi0);
 
-	  vnet_buffer(b0)->ip.flow_hash = l2_flow_hash(b0);
+	  if (is_l2)
+	  {
+	      vnet_buffer(b0)->ip.flow_hash = l2_flow_hash(b0);
+	  }
+	  else
+	  {
+	      /* it's BIER */
+	      const bier_hdr_t *bh0 = vlib_buffer_get_current(b0);
+	      vnet_buffer(b0)->ip.flow_hash = bier_hdr_get_entropy(bh0);
+	  }
 
 	  dpo0 = load_balance_get_bucket_i(lb0, 
 					   vnet_buffer(b0)->ip.flow_hash &
@@ -998,6 +1014,14 @@ l2_load_balance (vlib_main_t * vm,
   return frame->n_vectors;
 }
 
+static uword
+l2_load_balance (vlib_main_t * vm,
+		 vlib_node_runtime_t * node,
+		 vlib_frame_t * frame)
+{
+    return (load_balance_inline(vm, node, frame, 1));
+}
+
 static u8 *
 format_l2_load_balance_trace (u8 * s, va_list * args)
 {
@@ -1113,3 +1137,34 @@ VLIB_REGISTER_NODE (nsh_load_balance_node) = {
       [0] = "error-drop",
   },
 };
+
+static u8 *
+format_bier_load_balance_trace (u8 * s, va_list * args)
+{
+  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
+  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
+  load_balance_trace_t *t = va_arg (*args, load_balance_trace_t *);
+
+  s = format (s, "BIER-load-balance: index %d", t->lb_index);
+  return s;
+}
+
+static uword
+bier_load_balance (vlib_main_t * vm,
+		   vlib_node_runtime_t * node,
+		   vlib_frame_t * frame)
+{
+    return (load_balance_inline(vm, node, frame, 0));
+}
+
+/**
+ * @brief
+ */
+VLIB_REGISTER_NODE (bier_load_balance_node) = {
+  .function = bier_load_balance,
+  .name = "bier-load-balance",
+  .vector_size = sizeof (u32),
+
+  .format_trace = format_bier_load_balance_trace,
+  .sibling_of = "mpls-load-balance",
+};
diff --git a/src/vnet/dpo/replicate_dpo.c b/src/vnet/dpo/replicate_dpo.c
index 9fdb9a05071..ae045f6a431 100644
--- a/src/vnet/dpo/replicate_dpo.c
+++ b/src/vnet/dpo/replicate_dpo.c
@@ -261,7 +261,7 @@ replicate_fill_buckets (replicate_t *rep,
                         u32 n_buckets)
 {
     load_balance_path_t * nh;
-    u16 ii, bucket;
+    u16 bucket;
 
     bucket = 0;
 
@@ -271,11 +271,8 @@ replicate_fill_buckets (replicate_t *rep,
      */
     vec_foreach (nh, nhs)
     {
-        for (ii = 0; ii < nh->path_weight; ii++)
-        {
-            ASSERT(bucket < n_buckets);
-            replicate_set_bucket_i(rep, bucket++, buckets, &nh->path_dpo);
-        }
+        ASSERT(bucket < n_buckets);
+        replicate_set_bucket_i(rep, bucket++, buckets, &nh->path_dpo);
     }
 }
 
@@ -694,7 +691,10 @@ replicate_inline (vlib_main_t * vm,
 
                 if (PREDICT_FALSE(c0->flags & VLIB_BUFFER_IS_TRACED))
                 {
-                    replicate_trace_t *t = vlib_add_trace (vm, node, c0, sizeof (*t));
+                    replicate_trace_t *t;
+
+                    vlib_trace_buffer (vm, node, next0, c0, 0);
+                    t = vlib_add_trace (vm, node, c0, sizeof (*t));
                     t->rep_index = repi0;
                     t->dpo = *dpo0;
                 }