L2 BD: introduce a BD interface on which to send UU packets

Change-Id: I21ad6b04c19c8735d057174b1f260a59f2812241
Signed-off-by: Neale Ranns <nranns@cisco.com>

1 files changed, 242 insertions, 0 deletions

diff --git a/src/vnet/l2/l2_uu_fwd.c b/src/vnet/l2/l2_uu_fwd.c
new file mode 100644
index 00000000000..fd79387bbe0
--- /dev/null
+++ b/src/vnet/l2/l2_uu_fwd.c
@@ -0,0 +1,242 @@
+/*
+ * l2_uu_fwd.c : Foward unknown unicast packets to BD's configured interface
+ *
+ * Copyright (c) 2018 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <vnet/l2/l2_bd.h>
+#include <vnet/l2/l2_input.h>
+
+#define foreach_l2_uu_fwd_error					\
+_(L2_UU_FWD,           "L2 UU fwd")
+
+typedef enum
+{
+#define _(sym,str) L2_UU_FWD_ERROR_##sym,
+  foreach_l2_uu_fwd_error
+#undef _
+    L2_UU_FWD_N_ERROR,
+} l2_uu_fwd_error_t;
+
+static char *l2_uu_fwd_error_strings[] = {
+#define _(sym,string) string,
+  foreach_l2_uu_fwd_error
+#undef _
+};
+
+typedef enum
+{
+  L2_UU_FWD_NEXT_DROP,
+  L2_UU_FWD_NEXT_L2_OUTPUT,
+  L2_UU_FWD_N_NEXT,
+} l2_uu_fwd_next_t;
+
+typedef struct
+{
+  u32 sw_if_index;
+} l2_uu_fwd_trace_t;
+
+/* packet trace format function */
+static u8 *
+format_l2_uu_fwd_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 *);
+  l2_uu_fwd_trace_t *t = va_arg (*args, l2_uu_fwd_trace_t *);
+
+  s = format (s, "l2-uu-fwd: sw_if_index %d", t->sw_if_index);
+  return s;
+}
+
+static uword
+l2_uu_fwd_node_fn (vlib_main_t * vm,
+		   vlib_node_runtime_t * node, vlib_frame_t * frame)
+{
+  u32 n_left_from, *from, *to_next;
+  l2_uu_fwd_next_t next_index;
+
+  from = vlib_frame_vector_args (frame);
+  n_left_from = frame->n_vectors;
+  next_index = node->cached_next_index;
+
+  while (n_left_from > 0)
+    {
+      u32 n_left_to_next;
+
+      vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
+
+      while (n_left_from >= 8 && n_left_to_next >= 4)
+	{
+	  const l2_bridge_domain_t *bdc0, *bdc1, *bdc2, *bdc3;
+	  l2_uu_fwd_next_t next0, next1, next2, next3;
+	  vlib_buffer_t *b0, *b1, *b2, *b3;
+	  u32 bi0, bi1, bi2, bi3;
+
+	  {
+	    vlib_buffer_t *b4, *b5, *b6, *b7;
+
+	    b4 = vlib_get_buffer (vm, from[4]);
+	    b5 = vlib_get_buffer (vm, from[5]);
+	    b6 = vlib_get_buffer (vm, from[6]);
+	    b7 = vlib_get_buffer (vm, from[7]);
+
+	    vlib_prefetch_buffer_header (b4, STORE);
+	    vlib_prefetch_buffer_header (b5, STORE);
+	    vlib_prefetch_buffer_header (b6, STORE);
+	    vlib_prefetch_buffer_header (b7, STORE);
+	  }
+	  bi0 = to_next[0] = from[0];
+	  bi1 = to_next[1] = from[1];
+	  bi2 = to_next[2] = from[2];
+	  bi3 = to_next[3] = from[3];
+
+	  from += 4;
+	  to_next += 4;
+	  n_left_from -= 4;
+	  n_left_to_next -= 4;
+
+	  next3 = next2 = next1 = next0 = L2_UU_FWD_NEXT_L2_OUTPUT;
+
+	  b0 = vlib_get_buffer (vm, bi0);
+	  b1 = vlib_get_buffer (vm, bi1);
+	  b2 = vlib_get_buffer (vm, bi2);
+	  b3 = vlib_get_buffer (vm, bi3);
+
+	  bdc0 = vec_elt_at_index (l2input_main.bd_configs,
+				   vnet_buffer (b0)->l2.bd_index);
+	  bdc1 = vec_elt_at_index (l2input_main.bd_configs,
+				   vnet_buffer (b1)->l2.bd_index);
+	  bdc2 = vec_elt_at_index (l2input_main.bd_configs,
+				   vnet_buffer (b2)->l2.bd_index);
+	  bdc3 = vec_elt_at_index (l2input_main.bd_configs,
+				   vnet_buffer (b3)->l2.bd_index);
+
+	  ASSERT (~0 != bdc0->uu_fwd_sw_if_index);
+
+	  vnet_buffer (b0)->sw_if_index[VLIB_TX] = bdc0->uu_fwd_sw_if_index;
+	  vnet_buffer (b1)->sw_if_index[VLIB_TX] = bdc1->uu_fwd_sw_if_index;
+	  vnet_buffer (b2)->sw_if_index[VLIB_TX] = bdc2->uu_fwd_sw_if_index;
+	  vnet_buffer (b3)->sw_if_index[VLIB_TX] = bdc3->uu_fwd_sw_if_index;
+
+	  if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) &&
+			     (b0->flags & VLIB_BUFFER_IS_TRACED)))
+	    {
+	      l2_uu_fwd_trace_t *t;
+
+	      t = vlib_add_trace (vm, node, b0, sizeof (*t));
+	      t->sw_if_index = bdc0->uu_fwd_sw_if_index;
+	    }
+	  if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) &&
+			     (b1->flags & VLIB_BUFFER_IS_TRACED)))
+	    {
+	      l2_uu_fwd_trace_t *t;
+
+	      t = vlib_add_trace (vm, node, b1, sizeof (*t));
+	      t->sw_if_index = bdc1->uu_fwd_sw_if_index;
+	    }
+	  if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) &&
+			     (b1->flags & VLIB_BUFFER_IS_TRACED)))
+	    {
+	      l2_uu_fwd_trace_t *t;
+
+	      t = vlib_add_trace (vm, node, b2, sizeof (*t));
+	      t->sw_if_index = bdc2->uu_fwd_sw_if_index;
+	    }
+	  if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) &&
+			     (b1->flags & VLIB_BUFFER_IS_TRACED)))
+	    {
+	      l2_uu_fwd_trace_t *t;
+
+	      t = vlib_add_trace (vm, node, b3, sizeof (*t));
+	      t->sw_if_index = bdc3->uu_fwd_sw_if_index;
+	    }
+	  vlib_validate_buffer_enqueue_x4 (vm, node, next_index,
+					   to_next, n_left_to_next,
+					   bi0, bi1, bi2, bi3,
+					   next0, next1, next2, next3);
+	}
+
+      while (n_left_from > 0 && n_left_to_next > 0)
+	{
+	  const l2_bridge_domain_t *bdc0;
+	  l2_uu_fwd_next_t next0;
+	  vlib_buffer_t *b0;
+	  u32 bi0;
+
+	  bi0 = from[0];
+	  to_next[0] = bi0;
+	  from += 1;
+	  to_next += 1;
+	  n_left_from -= 1;
+	  n_left_to_next -= 1;
+	  next0 = L2_UU_FWD_NEXT_L2_OUTPUT;
+	  b0 = vlib_get_buffer (vm, bi0);
+
+	  bdc0 = vec_elt_at_index (l2input_main.bd_configs,
+				   vnet_buffer (b0)->l2.bd_index);
+	  ASSERT (~0 != bdc0->uu_fwd_sw_if_index);
+
+	  vnet_buffer (b0)->sw_if_index[VLIB_TX] = bdc0->uu_fwd_sw_if_index;
+
+	  if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) &&
+			     (b0->flags & VLIB_BUFFER_IS_TRACED)))
+	    {
+	      l2_uu_fwd_trace_t *t;
+
+	      t = vlib_add_trace (vm, node, b0, sizeof (*t));
+	      t->sw_if_index = bdc0->uu_fwd_sw_if_index;
+	    }
+	  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
+					   to_next, n_left_to_next,
+					   bi0, next0);
+	}
+
+      vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+    }
+
+  vlib_node_increment_counter (vm, node->node_index,
+			       L2_UU_FWD_ERROR_L2_UU_FWD, frame->n_vectors);
+
+  return frame->n_vectors;
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (l2_uu_fwd_node,static) = {
+  .function = l2_uu_fwd_node_fn,
+  .name = "l2-uu-fwd",
+  .vector_size = sizeof (u32),
+  .format_trace = format_l2_uu_fwd_trace,
+  .type = VLIB_NODE_TYPE_INTERNAL,
+
+  .n_errors = ARRAY_LEN(l2_uu_fwd_error_strings),
+  .error_strings = l2_uu_fwd_error_strings,
+
+  .n_next_nodes = L2_UU_FWD_N_NEXT,
+
+  .next_nodes = {
+        [L2_UU_FWD_NEXT_DROP] = "error-drop",
+        [L2_UU_FWD_NEXT_L2_OUTPUT] = "l2-output",
+  },
+};
+
+VLIB_NODE_FUNCTION_MULTIARCH (l2_uu_fwd_node, l2_uu_fwd_node_fn)
+/* *INDENT-ON* */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */