P2P Ethernet

Change-Id: Idb97e573961b3bc2acdeef77582314590795f8c3
Signed-off-by: Pavel Kotucek <pkotucek@cisco.com>

1 files changed, 247 insertions, 0 deletions

diff --git a/src/vnet/ethernet/p2p_ethernet_input.c b/src/vnet/ethernet/p2p_ethernet_input.c
new file mode 100644
index 00000000000..a58b832af14
--- /dev/null
+++ b/src/vnet/ethernet/p2p_ethernet_input.c
@@ -0,0 +1,247 @@
+/*
+ * node.c: p2p ethernet vpp node
+ *
+ * Copyright (c) 2016 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 <vlib/vlib.h>
+#include <vnet/vnet.h>
+#include <vppinfra/error.h>
+
+#include <vnet/ethernet/p2p_ethernet.h>
+
+#include <vppinfra/error.h>
+#include <vppinfra/elog.h>
+
+vlib_node_registration_t p2p_ethernet_input_node;
+
+/* packet trace format function */
+u8 *
+format_p2p_ethernet_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 *);
+  p2p_ethernet_trace_t *t = va_arg (*args, p2p_ethernet_trace_t *);
+
+  vnet_main_t *vnm = &vnet_main;
+  s = format (s, "P2P ethernet: %U -> %U",
+	      format_vnet_sw_if_index_name, vnm, t->sw_if_index,
+	      format_vnet_sw_if_index_name, vnm, t->p2pe_sw_if_index);
+
+  return s;
+}
+
+#define foreach_p2p_ethernet_error                      \
+_(HITS, "P2P ethernet incoming packets processed")
+
+typedef enum
+{
+#define _(sym,str) P2PE_ERROR_##sym,
+  foreach_p2p_ethernet_error
+#undef _
+    P2PE_N_ERROR,
+} p2p_ethernet_error_t;
+
+static char *p2p_ethernet_error_strings[] = {
+#define _(sym,string) string,
+  foreach_p2p_ethernet_error
+#undef _
+};
+
+static uword
+p2p_ethernet_input_node_fn (vlib_main_t * vm,
+			    vlib_node_runtime_t * node, vlib_frame_t * frame)
+{
+  u32 n_trace = vlib_get_trace_count (vm, node);
+  u32 n_left_from, *from, *to_next;
+  u32 next_index;
+  u32 n_p2p_ethernet_packets = 0;
+
+  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 >= 4 && n_left_to_next >= 2)
+	{
+	  u32 bi0, bi1;
+	  vlib_buffer_t *b0, *b1;
+	  u32 next0 = 0, next1 = 0;
+	  u32 sw_if_index0, sw_if_index1;
+	  ethernet_header_t *en0, *en1;
+	  u32 rx0, rx1;
+
+	  bi0 = from[0];
+	  bi1 = from[1];
+	  to_next[0] = bi0;
+	  to_next[1] = bi1;
+	  from += 2;
+	  to_next += 2;
+	  n_left_to_next -= 2;
+	  n_left_from -= 2;
+
+	  b0 = vlib_get_buffer (vm, bi0);
+	  b1 = vlib_get_buffer (vm, bi1);
+
+	  en0 = vlib_buffer_get_current (b0);
+	  sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
+	  en1 = vlib_buffer_get_current (b1);
+	  sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX];
+
+	  vnet_feature_next (sw_if_index0, &next0, b0);
+	  vnet_feature_next (sw_if_index1, &next1, b1);
+
+	  rx0 = p2p_ethernet_lookup (sw_if_index0, en0->src_address);
+	  rx1 = p2p_ethernet_lookup (sw_if_index1, en1->src_address);
+
+	  if (rx0 != ~0)
+	    {
+	      /* Send pkt to p2p_ethernet RX interface */
+	      vnet_buffer (b0)->sw_if_index[VLIB_RX] = rx0;
+	      n_p2p_ethernet_packets += 1;
+
+	      if (PREDICT_FALSE (n_trace > 0))
+		{
+		  p2p_ethernet_trace_t *t0;
+		  vlib_trace_buffer (vm, node, next_index, b0,
+				     1 /* follow_chain */ );
+		  vlib_set_trace_count (vm, node, --n_trace);
+		  t0 = vlib_add_trace (vm, node, b0, sizeof (*t0));
+		  t0->sw_if_index = sw_if_index0;
+		  t0->p2pe_sw_if_index = rx0;
+		}
+	    }
+	  if (rx1 != ~0)
+	    {
+	      /* Send pkt to p2p_ethernet RX interface */
+	      vnet_buffer (b1)->sw_if_index[VLIB_RX] = rx1;
+	      n_p2p_ethernet_packets += 1;
+
+	      if (PREDICT_FALSE (n_trace > 0))
+		{
+		  p2p_ethernet_trace_t *t1;
+		  vlib_trace_buffer (vm, node, next_index, b1,
+				     1 /* follow_chain */ );
+		  vlib_set_trace_count (vm, node, --n_trace);
+		  t1 = vlib_add_trace (vm, node, b1, sizeof (*t1));
+		  t1->sw_if_index = sw_if_index1;
+		  t1->p2pe_sw_if_index = rx1;
+		}
+	    }
+
+	  /* verify speculative enqueue, maybe switch current next frame */
+	  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
+					   to_next, n_left_to_next,
+					   bi0, next0);
+	  vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
+					   to_next, n_left_to_next,
+					   bi1, next1);
+	}
+
+      while (n_left_from > 0 && n_left_to_next > 0)
+	{
+	  u32 bi0;
+	  vlib_buffer_t *b0;
+	  u32 next0 = 0;
+	  u32 sw_if_index0;
+	  ethernet_header_t *en0;
+	  u32 rx0;
+
+	  bi0 = from[0];
+	  to_next[0] = bi0;
+	  from += 1;
+	  to_next += 1;
+	  n_left_from -= 1;
+	  n_left_to_next -= 1;
+
+	  b0 = vlib_get_buffer (vm, bi0);
+
+	  en0 = vlib_buffer_get_current (b0);
+	  sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
+
+	  vnet_feature_next (sw_if_index0, &next0, b0);
+
+	  rx0 = p2p_ethernet_lookup (sw_if_index0, en0->src_address);
+	  if (rx0 != ~0)
+	    {
+	      /* Send pkt to p2p_ethernet RX interface */
+	      vnet_buffer (b0)->sw_if_index[VLIB_RX] = rx0;
+	      n_p2p_ethernet_packets += 1;
+
+	      if (PREDICT_FALSE (n_trace > 0))
+		{
+		  p2p_ethernet_trace_t *t0;
+		  vlib_trace_buffer (vm, node, next_index, b0,
+				     1 /* follow_chain */ );
+		  vlib_set_trace_count (vm, node, --n_trace);
+		  t0 = vlib_add_trace (vm, node, b0, sizeof (*t0));
+		  t0->sw_if_index = sw_if_index0;
+		  t0->p2pe_sw_if_index = rx0;
+		}
+	    }
+	  else
+	    {
+	      if (PREDICT_FALSE (n_trace > 0))
+		{
+		  node->flags |= VLIB_NODE_FLAG_TRACE;
+		}
+	    }
+
+	  /* verify speculative enqueue, maybe switch current next frame */
+	  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, p2p_ethernet_input_node.index,
+			       P2PE_ERROR_HITS, n_p2p_ethernet_packets);
+  return frame->n_vectors;
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (p2p_ethernet_input_node) = {
+  .function = p2p_ethernet_input_node_fn,
+  .name = "p2p-ethernet-input",
+  .vector_size = sizeof (u32),
+  .format_trace = format_p2p_ethernet_trace,
+  .type = VLIB_NODE_TYPE_INTERNAL,
+
+  .n_errors = ARRAY_LEN(p2p_ethernet_error_strings),
+  .error_strings = p2p_ethernet_error_strings,
+
+  .n_next_nodes = 1,
+
+  /* edit / add dispositions here */
+  .next_nodes = {
+    [0] = "error-drop",
+  },
+};
+/* *INDENT-ON* */
+
+VLIB_NODE_FUNCTION_MULTIARCH (p2p_ethernet_input_node,
+			      p2p_ethernet_input_node_fn)
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */