Reorganize source tree to use single autotools instance

Change-Id: I7b51f88292e057c6443b12224486f2d0c9f8ae23
Signed-off-by: Damjan Marion <damarion@cisco.com>

1 files changed, 597 insertions, 0 deletions

diff --git a/src/vnet/l2/l2_learn.c b/src/vnet/l2/l2_learn.c
new file mode 100644
index 00000000000..7f19f936d70
--- /dev/null
+++ b/src/vnet/l2/l2_learn.c
@@ -0,0 +1,597 @@
+/*
+ * l2_learn.c : layer 2 learning using l2fib
+ *
+ * Copyright (c) 2013 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 <vnet/pg/pg.h>
+#include <vnet/ethernet/ethernet.h>
+#include <vlib/cli.h>
+
+#include <vnet/l2/l2_input.h>
+#include <vnet/l2/feat_bitmap.h>
+#include <vnet/l2/l2_fib.h>
+#include <vnet/l2/l2_learn.h>
+
+#include <vppinfra/error.h>
+#include <vppinfra/hash.h>
+
+/**
+ * @file
+ * @brief Ethernet Bridge Learning.
+ *
+ * Populate the mac table with entries mapping the packet's source mac + bridge
+ * domain ID to the input sw_if_index.
+ *
+ * Note that learning and forwarding are separate graph nodes. This means that
+ * for a set of packets, all learning is performed first, then all nodes are
+ * forwarded. The forwarding is done based on the end-state of the mac table,
+ * instead of the state after each packet. Thus the forwarding results could
+ * differ in certain cases (mac move tests), but this not expected to cause
+ * problems in real-world networks. It is much simpler to separate learning
+ * and forwarding into separate nodes.
+ */
+
+
+typedef struct
+{
+  u8 src[6];
+  u8 dst[6];
+  u32 sw_if_index;
+  u16 bd_index;
+} l2learn_trace_t;
+
+
+/* packet trace format function */
+static u8 *
+format_l2learn_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 *);
+  l2learn_trace_t *t = va_arg (*args, l2learn_trace_t *);
+
+  s = format (s, "l2-learn: sw_if_index %d dst %U src %U bd_index %d",
+	      t->sw_if_index,
+	      format_ethernet_address, t->dst,
+	      format_ethernet_address, t->src, t->bd_index);
+  return s;
+}
+
+static vlib_node_registration_t l2learn_node;
+
+#define foreach_l2learn_error				\
+_(L2LEARN,           "L2 learn packets")		\
+_(MISS,              "L2 learn misses")			\
+_(MAC_MOVE,          "L2 mac moves")			\
+_(MAC_MOVE_VIOLATE,  "L2 mac move violations")		\
+_(LIMIT,             "L2 not learned due to limit")	\
+_(HIT,               "L2 learn hits")			\
+_(FILTER_DROP,       "L2 filter mac drops")
+
+typedef enum
+{
+#define _(sym,str) L2LEARN_ERROR_##sym,
+  foreach_l2learn_error
+#undef _
+    L2LEARN_N_ERROR,
+} l2learn_error_t;
+
+static char *l2learn_error_strings[] = {
+#define _(sym,string) string,
+  foreach_l2learn_error
+#undef _
+};
+
+typedef enum
+{
+  L2LEARN_NEXT_L2FWD,
+  L2LEARN_NEXT_DROP,
+  L2LEARN_N_NEXT,
+} l2learn_next_t;
+
+
+/** Perform learning on one packet based on the mac table lookup result. */
+
+static_always_inline void
+l2learn_process (vlib_node_runtime_t * node,
+		 l2learn_main_t * msm,
+		 u64 * counter_base,
+		 vlib_buffer_t * b0,
+		 u32 sw_if_index0,
+		 l2fib_entry_key_t * key0,
+		 l2fib_entry_key_t * cached_key,
+		 u32 * bucket0,
+		 l2fib_entry_result_t * result0, u32 * next0, u8 timestamp)
+{
+  u32 feature_bitmap;
+
+  /* Set up the default next node (typically L2FWD) */
+
+  /* Remove ourself from the feature bitmap */
+  feature_bitmap = vnet_buffer (b0)->l2.feature_bitmap & ~L2INPUT_FEAT_LEARN;
+
+  /* Save for next feature graph nodes */
+  vnet_buffer (b0)->l2.feature_bitmap = feature_bitmap;
+
+  /* Determine the next node */
+  *next0 = feat_bitmap_get_next_node_index (msm->feat_next_node_index,
+					    feature_bitmap);
+
+  /* Check mac table lookup result */
+
+  if (PREDICT_TRUE (result0->fields.sw_if_index == sw_if_index0))
+    {
+      /*
+       * The entry was in the table, and the sw_if_index matched, the normal case
+       */
+      counter_base[L2LEARN_ERROR_HIT] += 1;
+      if (PREDICT_FALSE (result0->fields.timestamp != timestamp))
+	result0->fields.timestamp = timestamp;
+
+    }
+  else if (result0->raw == ~0)
+    {
+
+      /* The entry was not in table, so add it  */
+
+      counter_base[L2LEARN_ERROR_MISS] += 1;
+
+      if (msm->global_learn_count == msm->global_learn_limit)
+	{
+	  /*
+	   * Global limit reached. Do not learn the mac but forward the packet.
+	   * In the future, limits could also be per-interface or bridge-domain.
+	   */
+	  counter_base[L2LEARN_ERROR_LIMIT] += 1;
+	  goto done;
+
+	}
+      else
+	{
+	  BVT (clib_bihash_kv) kv;
+	  /* It is ok to learn */
+
+	  result0->raw = 0;	/* clear all fields */
+	  result0->fields.sw_if_index = sw_if_index0;
+	  result0->fields.timestamp = timestamp;
+	  kv.key = key0->raw;
+	  kv.value = result0->raw;
+
+	  BV (clib_bihash_add_del) (msm->mac_table, &kv, 1 /* is_add */ );
+
+	  cached_key->raw = ~0;	/* invalidate the cache */
+	  msm->global_learn_count++;
+	}
+
+    }
+  else
+    {
+
+      /* The entry was in the table, but with the wrong sw_if_index mapping (mac move) */
+      counter_base[L2LEARN_ERROR_MAC_MOVE] += 1;
+
+      if (result0->fields.static_mac)
+	{
+	  /*
+	   * Don't overwrite a static mac
+	   * TODO: Check violation policy. For now drop the packet
+	   */
+	  b0->error = node->errors[L2LEARN_ERROR_MAC_MOVE_VIOLATE];
+	  *next0 = L2LEARN_NEXT_DROP;
+	}
+      else
+	{
+	  /*
+	   * Update the entry
+	   * TODO: may want to rate limit mac moves
+	   * TODO: check global/bridge domain/interface learn limits
+	   */
+	  BVT (clib_bihash_kv) kv;
+
+	  result0->raw = 0;	/* clear all fields */
+	  result0->fields.sw_if_index = sw_if_index0;
+	  result0->fields.timestamp = timestamp;
+
+	  kv.key = key0->raw;
+	  kv.value = result0->raw;
+
+	  cached_key->raw = ~0;	/* invalidate the cache */
+
+	  BV (clib_bihash_add_del) (msm->mac_table, &kv, 1 /* is_add */ );
+	}
+    }
+
+  if (result0->fields.filter)
+    {
+      /* drop packet because lookup matched a filter mac entry */
+
+      if (*next0 != L2LEARN_NEXT_DROP)
+	{
+	  /* if we're not already dropping the packet, do it now */
+	  b0->error = node->errors[L2LEARN_ERROR_FILTER_DROP];
+	  *next0 = L2LEARN_NEXT_DROP;
+	}
+    }
+
+done:
+  return;
+}
+
+
+static uword
+l2learn_node_fn (vlib_main_t * vm,
+		 vlib_node_runtime_t * node, vlib_frame_t * frame)
+{
+  u32 n_left_from, *from, *to_next;
+  l2learn_next_t next_index;
+  l2learn_main_t *msm = &l2learn_main;
+  vlib_node_t *n = vlib_get_node (vm, l2learn_node.index);
+  u32 node_counter_base_index = n->error_heap_index;
+  vlib_error_main_t *em = &vm->error_main;
+  l2fib_entry_key_t cached_key;
+  l2fib_entry_result_t cached_result;
+  u8 timestamp = (u8) (vlib_time_now (vm) / 60);
+
+  from = vlib_frame_vector_args (frame);
+  n_left_from = frame->n_vectors;	/* number of packets to process */
+  next_index = node->cached_next_index;
+
+  /* Clear the one-entry cache in case mac table was updated */
+  cached_key.raw = ~0;
+  cached_result.raw = ~0;	/* warning be gone */
+
+  while (n_left_from > 0)
+    {
+      u32 n_left_to_next;
+
+      /* get space to enqueue frame to graph node "next_index" */
+      vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
+
+      while (n_left_from >= 8 && n_left_to_next >= 4)
+	{
+	  u32 bi0, bi1, bi2, bi3;
+	  vlib_buffer_t *b0, *b1, *b2, *b3;
+	  u32 next0, next1, next2, next3;
+	  u32 sw_if_index0, sw_if_index1, sw_if_index2, sw_if_index3;
+	  ethernet_header_t *h0, *h1, *h2, *h3;
+	  l2fib_entry_key_t key0, key1, key2, key3;
+	  l2fib_entry_result_t result0, result1, result2, result3;
+	  u32 bucket0, bucket1, bucket2, bucket3;
+
+	  /* Prefetch next iteration. */
+	  {
+	    vlib_buffer_t *p4, *p5, *p6, *p7;;
+
+	    p4 = vlib_get_buffer (vm, from[4]);
+	    p5 = vlib_get_buffer (vm, from[5]);
+	    p6 = vlib_get_buffer (vm, from[6]);
+	    p7 = vlib_get_buffer (vm, from[7]);
+
+	    vlib_prefetch_buffer_header (p4, LOAD);
+	    vlib_prefetch_buffer_header (p5, LOAD);
+	    vlib_prefetch_buffer_header (p6, LOAD);
+	    vlib_prefetch_buffer_header (p7, LOAD);
+
+	    CLIB_PREFETCH (p4->data, CLIB_CACHE_LINE_BYTES, STORE);
+	    CLIB_PREFETCH (p5->data, CLIB_CACHE_LINE_BYTES, STORE);
+	    CLIB_PREFETCH (p6->data, CLIB_CACHE_LINE_BYTES, STORE);
+	    CLIB_PREFETCH (p7->data, CLIB_CACHE_LINE_BYTES, STORE);
+	  }
+
+	  /* speculatively enqueue b0 and b1 to the current next frame */
+	  /* bi is "buffer index", b is pointer to the buffer */
+	  to_next[0] = bi0 = from[0];
+	  to_next[1] = bi1 = from[1];
+	  to_next[2] = bi2 = from[2];
+	  to_next[3] = bi3 = from[3];
+	  from += 4;
+	  to_next += 4;
+	  n_left_from -= 4;
+	  n_left_to_next -= 4;
+
+	  b0 = vlib_get_buffer (vm, bi0);
+	  b1 = vlib_get_buffer (vm, bi1);
+	  b2 = vlib_get_buffer (vm, bi2);
+	  b3 = vlib_get_buffer (vm, bi3);
+
+	  /* RX interface handles */
+	  sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
+	  sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX];
+	  sw_if_index2 = vnet_buffer (b2)->sw_if_index[VLIB_RX];
+	  sw_if_index3 = vnet_buffer (b3)->sw_if_index[VLIB_RX];
+
+	  /* Process 4 x pkts */
+
+	  h0 = vlib_buffer_get_current (b0);
+	  h1 = vlib_buffer_get_current (b1);
+	  h2 = vlib_buffer_get_current (b2);
+	  h3 = vlib_buffer_get_current (b3);
+
+	  if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)))
+	    {
+	      if (b0->flags & VLIB_BUFFER_IS_TRACED)
+		{
+		  l2learn_trace_t *t =
+		    vlib_add_trace (vm, node, b0, sizeof (*t));
+		  t->sw_if_index = sw_if_index0;
+		  t->bd_index = vnet_buffer (b0)->l2.bd_index;
+		  clib_memcpy (t->src, h0->src_address, 6);
+		  clib_memcpy (t->dst, h0->dst_address, 6);
+		}
+	      if (b1->flags & VLIB_BUFFER_IS_TRACED)
+		{
+		  l2learn_trace_t *t =
+		    vlib_add_trace (vm, node, b1, sizeof (*t));
+		  t->sw_if_index = sw_if_index1;
+		  t->bd_index = vnet_buffer (b1)->l2.bd_index;
+		  clib_memcpy (t->src, h1->src_address, 6);
+		  clib_memcpy (t->dst, h1->dst_address, 6);
+		}
+	      if (b2->flags & VLIB_BUFFER_IS_TRACED)
+		{
+		  l2learn_trace_t *t =
+		    vlib_add_trace (vm, node, b2, sizeof (*t));
+		  t->sw_if_index = sw_if_index2;
+		  t->bd_index = vnet_buffer (b2)->l2.bd_index;
+		  clib_memcpy (t->src, h2->src_address, 6);
+		  clib_memcpy (t->dst, h2->dst_address, 6);
+		}
+	      if (b3->flags & VLIB_BUFFER_IS_TRACED)
+		{
+		  l2learn_trace_t *t =
+		    vlib_add_trace (vm, node, b3, sizeof (*t));
+		  t->sw_if_index = sw_if_index3;
+		  t->bd_index = vnet_buffer (b3)->l2.bd_index;
+		  clib_memcpy (t->src, h3->src_address, 6);
+		  clib_memcpy (t->dst, h3->dst_address, 6);
+		}
+	    }
+
+	  /* process 4 pkts */
+	  vlib_node_increment_counter (vm, l2learn_node.index,
+				       L2LEARN_ERROR_L2LEARN, 4);
+
+	  l2fib_lookup_4 (msm->mac_table, &cached_key, &cached_result,
+			  h0->src_address,
+			  h1->src_address,
+			  h2->src_address,
+			  h3->src_address,
+			  vnet_buffer (b0)->l2.bd_index,
+			  vnet_buffer (b1)->l2.bd_index,
+			  vnet_buffer (b2)->l2.bd_index,
+			  vnet_buffer (b3)->l2.bd_index,
+			  &key0, &key1, &key2, &key3,
+			  &bucket0, &bucket1, &bucket2, &bucket3,
+			  &result0, &result1, &result2, &result3);
+
+	  l2learn_process (node, msm, &em->counters[node_counter_base_index],
+			   b0, sw_if_index0, &key0, &cached_key,
+			   &bucket0, &result0, &next0, timestamp);
+
+	  l2learn_process (node, msm, &em->counters[node_counter_base_index],
+			   b1, sw_if_index1, &key1, &cached_key,
+			   &bucket1, &result1, &next1, timestamp);
+
+	  l2learn_process (node, msm, &em->counters[node_counter_base_index],
+			   b2, sw_if_index2, &key2, &cached_key,
+			   &bucket2, &result2, &next2, timestamp);
+
+	  l2learn_process (node, msm, &em->counters[node_counter_base_index],
+			   b3, sw_if_index3, &key3, &cached_key,
+			   &bucket3, &result3, &next3, timestamp);
+
+	  /* verify speculative enqueues, maybe switch current next frame */
+	  /* if next0==next1==next_index then nothing special needs to be done */
+	  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)
+	{
+	  u32 bi0;
+	  vlib_buffer_t *b0;
+	  u32 next0;
+	  u32 sw_if_index0;
+	  ethernet_header_t *h0;
+	  l2fib_entry_key_t key0;
+	  l2fib_entry_result_t result0;
+	  u32 bucket0;
+
+	  /* speculatively enqueue b0 to the current next frame */
+	  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);
+
+	  sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
+
+	  h0 = vlib_buffer_get_current (b0);
+
+	  if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
+			     && (b0->flags & VLIB_BUFFER_IS_TRACED)))
+	    {
+	      l2learn_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t));
+	      t->sw_if_index = sw_if_index0;
+	      t->bd_index = vnet_buffer (b0)->l2.bd_index;
+	      clib_memcpy (t->src, h0->src_address, 6);
+	      clib_memcpy (t->dst, h0->dst_address, 6);
+	    }
+
+	  /* process 1 pkt */
+	  vlib_node_increment_counter (vm, l2learn_node.index,
+				       L2LEARN_ERROR_L2LEARN, 1);
+
+
+	  l2fib_lookup_1 (msm->mac_table, &cached_key, &cached_result,
+			  h0->src_address, vnet_buffer (b0)->l2.bd_index,
+			  &key0, &bucket0, &result0);
+
+	  l2learn_process (node, msm, &em->counters[node_counter_base_index],
+			   b0, sw_if_index0, &key0, &cached_key,
+			   &bucket0, &result0, &next0, timestamp);
+
+	  /* 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);
+    }
+
+  return frame->n_vectors;
+}
+
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (l2learn_node,static) = {
+  .function = l2learn_node_fn,
+  .name = "l2-learn",
+  .vector_size = sizeof (u32),
+  .format_trace = format_l2learn_trace,
+  .type = VLIB_NODE_TYPE_INTERNAL,
+
+  .n_errors = ARRAY_LEN(l2learn_error_strings),
+  .error_strings = l2learn_error_strings,
+
+  .n_next_nodes = L2LEARN_N_NEXT,
+
+  /* edit / add dispositions here */
+  .next_nodes = {
+        [L2LEARN_NEXT_DROP] = "error-drop",
+        [L2LEARN_NEXT_L2FWD] = "l2-fwd",
+  },
+};
+/* *INDENT-ON* */
+
+VLIB_NODE_FUNCTION_MULTIARCH (l2learn_node, l2learn_node_fn)
+     clib_error_t *l2learn_init (vlib_main_t * vm)
+{
+  l2learn_main_t *mp = &l2learn_main;
+
+  mp->vlib_main = vm;
+  mp->vnet_main = vnet_get_main ();
+
+  /* Initialize the feature next-node indexes */
+  feat_bitmap_init_next_nodes (vm,
+			       l2learn_node.index,
+			       L2INPUT_N_FEAT,
+			       l2input_get_feat_names (),
+			       mp->feat_next_node_index);
+
+  /* init the hash table ptr */
+  mp->mac_table = get_mac_table ();
+
+  /*
+   * Set the default number of dynamically learned macs to the number
+   * of buckets.
+   */
+  mp->global_learn_limit = L2FIB_NUM_BUCKETS * 16;
+
+  return 0;
+}
+
+VLIB_INIT_FUNCTION (l2learn_init);
+
+
+/**
+ * Set subinterface learn enable/disable.
+ * The CLI format is:
+ *    set interface l2 learn <interface> [disable]
+ */
+static clib_error_t *
+int_learn (vlib_main_t * vm,
+	   unformat_input_t * input, vlib_cli_command_t * cmd)
+{
+  vnet_main_t *vnm = vnet_get_main ();
+  clib_error_t *error = 0;
+  u32 sw_if_index;
+  u32 enable;
+
+  if (!unformat_user (input, unformat_vnet_sw_interface, vnm, &sw_if_index))
+    {
+      error = clib_error_return (0, "unknown interface `%U'",
+				 format_unformat_error, input);
+      goto done;
+    }
+
+  enable = 1;
+  if (unformat (input, "disable"))
+    {
+      enable = 0;
+    }
+
+  /* set the interface flag */
+  l2input_intf_bitmap_enable (sw_if_index, L2INPUT_FEAT_LEARN, enable);
+
+done:
+  return error;
+}
+
+/*?
+ * Layer 2 learning can be enabled and disabled on each
+ * interface and on each bridge-domain. Use this command to
+ * manage interfaces. It is enabled by default.
+ *
+ * @cliexpar
+ * Example of how to enable learning:
+ * @cliexcmd{set interface l2 learn GigabitEthernet0/8/0}
+ * Example of how to disable learning:
+ * @cliexcmd{set interface l2 learn GigabitEthernet0/8/0 disable}
+?*/
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (int_learn_cli, static) = {
+  .path = "set interface l2 learn",
+  .short_help = "set interface l2 learn <interface> [disable]",
+  .function = int_learn,
+};
+/* *INDENT-ON* */
+
+
+static clib_error_t *
+l2learn_config (vlib_main_t * vm, unformat_input_t * input)
+{
+  l2learn_main_t *mp = &l2learn_main;
+
+  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
+    {
+      if (unformat (input, "limit %d", &mp->global_learn_limit))
+	;
+
+      else
+	return clib_error_return (0, "unknown input `%U'",
+				  format_unformat_error, input);
+    }
+
+  return 0;
+}
+
+VLIB_CONFIG_FUNCTION (l2learn_config, "l2learn");
+
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */