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authorDamjan Marion <damarion@cisco.com>2016-12-19 23:05:39 +0100
committerDamjan Marion <damarion@cisco.com>2016-12-28 12:25:14 +0100
commit7cd468a3d7dee7d6c92f69a0bb7061ae208ec727 (patch)
tree5de62f8dbd3a752f5a676ca600e43d2652d1ff1a /src/vnet/dpo
parent696f1adec0df3b8f161862566dd9c86174302658 (diff)
Reorganize source tree to use single autotools instance
Change-Id: I7b51f88292e057c6443b12224486f2d0c9f8ae23 Signed-off-by: Damjan Marion <damarion@cisco.com>
Diffstat (limited to 'src/vnet/dpo')
-rw-r--r--src/vnet/dpo/classify_dpo.c131
-rw-r--r--src/vnet/dpo/classify_dpo.h56
-rw-r--r--src/vnet/dpo/dpo.c500
-rw-r--r--src/vnet/dpo/dpo.h381
-rw-r--r--src/vnet/dpo/drop_dpo.c106
-rw-r--r--src/vnet/dpo/drop_dpo.h31
-rw-r--r--src/vnet/dpo/ip_null_dpo.c408
-rw-r--r--src/vnet/dpo/ip_null_dpo.h56
-rw-r--r--src/vnet/dpo/load_balance.c993
-rw-r--r--src/vnet/dpo/load_balance.h211
-rw-r--r--src/vnet/dpo/load_balance_map.c575
-rw-r--r--src/vnet/dpo/load_balance_map.h79
-rw-r--r--src/vnet/dpo/lookup_dpo.c1185
-rw-r--r--src/vnet/dpo/lookup_dpo.h108
-rw-r--r--src/vnet/dpo/mpls_label_dpo.c570
-rw-r--r--src/vnet/dpo/mpls_label_dpo.h101
-rw-r--r--src/vnet/dpo/punt_dpo.c100
-rw-r--r--src/vnet/dpo/punt_dpo.h30
-rw-r--r--src/vnet/dpo/receive_dpo.c165
-rw-r--r--src/vnet/dpo/receive_dpo.h62
20 files changed, 5848 insertions, 0 deletions
diff --git a/src/vnet/dpo/classify_dpo.c b/src/vnet/dpo/classify_dpo.c
new file mode 100644
index 00000000000..9e7886c9edd
--- /dev/null
+++ b/src/vnet/dpo/classify_dpo.c
@@ -0,0 +1,131 @@
+/*
+ * 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 <vnet/ip/ip.h>
+#include <vnet/dpo/classify_dpo.h>
+#include <vnet/mpls/mpls.h>
+
+/*
+ * pool of all MPLS Label DPOs
+ */
+classify_dpo_t *classify_dpo_pool;
+
+static classify_dpo_t *
+classify_dpo_alloc (void)
+{
+ classify_dpo_t *cd;
+
+ pool_get_aligned(classify_dpo_pool, cd, CLIB_CACHE_LINE_BYTES);
+ memset(cd, 0, sizeof(*cd));
+
+ return (cd);
+}
+
+static index_t
+classify_dpo_get_index (classify_dpo_t *cd)
+{
+ return (cd - classify_dpo_pool);
+}
+
+index_t
+classify_dpo_create (dpo_proto_t proto,
+ u32 classify_table_index)
+{
+ classify_dpo_t *cd;
+
+ cd = classify_dpo_alloc();
+ cd->cd_proto = proto;
+ cd->cd_table_index = classify_table_index;
+
+ return (classify_dpo_get_index(cd));
+}
+
+u8*
+format_classify_dpo (u8 *s, va_list *args)
+{
+ index_t index = va_arg (*args, index_t);
+ CLIB_UNUSED(u32 indent) = va_arg (*args, u32);
+ classify_dpo_t *cd;
+
+ cd = classify_dpo_get(index);
+
+ return (format(s, "%U-classify:[%d]:table:%d",
+ format_dpo_proto, cd->cd_proto,
+ index, cd->cd_table_index));
+}
+
+static void
+classify_dpo_lock (dpo_id_t *dpo)
+{
+ classify_dpo_t *cd;
+
+ cd = classify_dpo_get(dpo->dpoi_index);
+
+ cd->cd_locks++;
+}
+
+static void
+classify_dpo_unlock (dpo_id_t *dpo)
+{
+ classify_dpo_t *cd;
+
+ cd = classify_dpo_get(dpo->dpoi_index);
+
+ cd->cd_locks--;
+
+ if (0 == cd->cd_locks)
+ {
+ pool_put(classify_dpo_pool, cd);
+ }
+}
+
+static void
+classify_dpo_mem_show (void)
+{
+ fib_show_memory_usage("Classify",
+ pool_elts(classify_dpo_pool),
+ pool_len(classify_dpo_pool),
+ sizeof(classify_dpo_t));
+}
+
+const static dpo_vft_t cd_vft = {
+ .dv_lock = classify_dpo_lock,
+ .dv_unlock = classify_dpo_unlock,
+ .dv_format = format_classify_dpo,
+ .dv_mem_show = classify_dpo_mem_show,
+};
+
+const static char* const classify_ip4_nodes[] =
+{
+ "ip4-classify",
+ NULL,
+};
+const static char* const classify_ip6_nodes[] =
+{
+ "ip6-classify",
+ NULL,
+};
+const static char* const * const classify_nodes[DPO_PROTO_NUM] =
+{
+ [DPO_PROTO_IP4] = classify_ip4_nodes,
+ [DPO_PROTO_IP6] = classify_ip6_nodes,
+ [DPO_PROTO_MPLS] = NULL,
+};
+
+void
+classify_dpo_module_init (void)
+{
+ dpo_register(DPO_CLASSIFY, &cd_vft, classify_nodes);
+}
diff --git a/src/vnet/dpo/classify_dpo.h b/src/vnet/dpo/classify_dpo.h
new file mode 100644
index 00000000000..48f4b2bf8a5
--- /dev/null
+++ b/src/vnet/dpo/classify_dpo.h
@@ -0,0 +1,56 @@
+/*
+ * 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.
+ */
+
+#ifndef __CLASSIFY_DPO_H__
+#define __CLASSIFY_DPO_H__
+
+#include <vnet/vnet.h>
+#include <vnet/mpls/packet.h>
+#include <vnet/dpo/dpo.h>
+
+/**
+ * A representation of an MPLS label for imposition in the data-path
+ */
+typedef struct classify_dpo_t
+{
+ dpo_proto_t cd_proto;
+
+ u32 cd_table_index;
+
+ /**
+ * Number of locks/users of the label
+ */
+ u16 cd_locks;
+} classify_dpo_t;
+
+extern index_t classify_dpo_create(dpo_proto_t proto,
+ u32 classify_table_index);
+
+extern u8* format_classify_dpo(u8 *s, va_list *args);
+
+/*
+ * Encapsulation violation for fast data-path access
+ */
+extern classify_dpo_t *classify_dpo_pool;
+
+static inline classify_dpo_t *
+classify_dpo_get (index_t index)
+{
+ return (pool_elt_at_index(classify_dpo_pool, index));
+}
+
+extern void classify_dpo_module_init(void);
+
+#endif
diff --git a/src/vnet/dpo/dpo.c b/src/vnet/dpo/dpo.c
new file mode 100644
index 00000000000..688d2892412
--- /dev/null
+++ b/src/vnet/dpo/dpo.c
@@ -0,0 +1,500 @@
+/*
+ * 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.
+ */
+/**
+ * @brief
+ * A Data-Path Object is an object that represents actions that are
+ * applied to packets are they are switched through VPP.
+ *
+ * The DPO is a base class that is specialised by other objects to provide
+ * concreate actions
+ *
+ * The VLIB graph nodes are graph of types, the DPO graph is a graph of instances.
+ */
+
+#include <vnet/dpo/dpo.h>
+#include <vnet/ip/lookup.h>
+#include <vnet/ip/format.h>
+#include <vnet/adj/adj.h>
+
+#include <vnet/dpo/load_balance.h>
+#include <vnet/dpo/mpls_label_dpo.h>
+#include <vnet/dpo/lookup_dpo.h>
+#include <vnet/dpo/drop_dpo.h>
+#include <vnet/dpo/receive_dpo.h>
+#include <vnet/dpo/punt_dpo.h>
+#include <vnet/dpo/classify_dpo.h>
+#include <vnet/dpo/ip_null_dpo.h>
+
+/**
+ * Array of char* names for the DPO types and protos
+ */
+static const char* dpo_type_names[] = DPO_TYPES;
+static const char* dpo_proto_names[] = DPO_PROTOS;
+
+/**
+ * @brief Vector of virtual function tables for the DPO types
+ *
+ * This is a vector so we can dynamically register new DPO types in plugins.
+ */
+static dpo_vft_t *dpo_vfts;
+
+/**
+ * @brief vector of graph node names associated with each DPO type and protocol.
+ *
+ * dpo_nodes[child_type][child_proto][node_X] = node_name;
+ * i.e.
+ * dpo_node[DPO_LOAD_BALANCE][DPO_PROTO_IP4][0] = "ip4-lookup"
+ * dpo_node[DPO_LOAD_BALANCE][DPO_PROTO_IP4][1] = "ip4-load-balance"
+ *
+ * This is a vector so we can dynamically register new DPO types in plugins.
+ */
+static const char* const * const ** dpo_nodes;
+
+/**
+ * @brief Vector of edge indicies from parent DPO nodes to child
+ *
+ * dpo_edges[child_type][child_proto][parent_type][parent_proto] = edge_index
+ *
+ * This array is derived at init time from the dpo_nodes above. Note that
+ * the third dimension in dpo_nodes is lost, hence, the edge index from each
+ * node MUST be the same.
+ * Including both the child and parent protocol is required to support the
+ * case where it changes as the grapth is traversed, most notablly when an
+ * MPLS label is popped.
+ *
+ * Note that this array is child type specific, not child instance specific.
+ */
+static u32 ****dpo_edges;
+
+/**
+ * @brief The DPO type value that can be assigend to the next dynamic
+ * type registration.
+ */
+static dpo_type_t dpo_dynamic = DPO_LAST;
+
+dpo_proto_t
+vnet_link_to_dpo_proto (vnet_link_t linkt)
+{
+ switch (linkt)
+ {
+ case VNET_LINK_IP6:
+ return (DPO_PROTO_IP6);
+ case VNET_LINK_IP4:
+ return (DPO_PROTO_IP4);
+ case VNET_LINK_MPLS:
+ return (DPO_PROTO_MPLS);
+ case VNET_LINK_ETHERNET:
+ return (DPO_PROTO_ETHERNET);
+ case VNET_LINK_ARP:
+ break;
+ }
+ ASSERT(0);
+ return (0);
+}
+
+u8 *
+format_dpo_type (u8 * s, va_list * args)
+{
+ dpo_type_t type = va_arg (*args, int);
+
+ s = format(s, "%s", dpo_type_names[type]);
+
+ return (s);
+}
+
+u8 *
+format_dpo_id (u8 * s, va_list * args)
+{
+ dpo_id_t *dpo = va_arg (*args, dpo_id_t*);
+ u32 indent = va_arg (*args, u32);
+
+ s = format(s, "[@%d]: ", dpo->dpoi_next_node);
+
+ if (NULL != dpo_vfts[dpo->dpoi_type].dv_format)
+ {
+ return (format(s, "%U",
+ dpo_vfts[dpo->dpoi_type].dv_format,
+ dpo->dpoi_index,
+ indent));
+ }
+
+ switch (dpo->dpoi_type)
+ {
+ case DPO_FIRST:
+ s = format(s, "unset");
+ break;
+ default:
+ s = format(s, "unknown");
+ break;
+ }
+ return (s);
+}
+
+u8 *
+format_dpo_proto (u8 * s, va_list * args)
+{
+ dpo_proto_t proto = va_arg (*args, int);
+
+ return (format(s, "%s", dpo_proto_names[proto]));
+}
+
+void
+dpo_set (dpo_id_t *dpo,
+ dpo_type_t type,
+ dpo_proto_t proto,
+ index_t index)
+{
+ dpo_id_t tmp = *dpo;
+
+ dpo->dpoi_type = type;
+ dpo->dpoi_proto = proto,
+ dpo->dpoi_index = index;
+
+ if (DPO_ADJACENCY == type)
+ {
+ /*
+ * set the adj subtype
+ */
+ ip_adjacency_t *adj;
+
+ adj = adj_get(index);
+
+ switch (adj->lookup_next_index)
+ {
+ case IP_LOOKUP_NEXT_ARP:
+ dpo->dpoi_type = DPO_ADJACENCY_INCOMPLETE;
+ break;
+ case IP_LOOKUP_NEXT_MIDCHAIN:
+ dpo->dpoi_type = DPO_ADJACENCY_MIDCHAIN;
+ break;
+ default:
+ break;
+ }
+ }
+ dpo_lock(dpo);
+ dpo_unlock(&tmp);
+}
+
+void
+dpo_reset (dpo_id_t *dpo)
+{
+ dpo_id_t tmp = DPO_INVALID;
+
+ /*
+ * use the atomic copy operation.
+ */
+ dpo_copy(dpo, &tmp);
+}
+
+/**
+ * \brief
+ * Compare two Data-path objects
+ *
+ * like memcmp, return 0 is matching, !0 otherwise.
+ */
+int
+dpo_cmp (const dpo_id_t *dpo1,
+ const dpo_id_t *dpo2)
+{
+ int res;
+
+ res = dpo1->dpoi_type - dpo2->dpoi_type;
+
+ if (0 != res) return (res);
+
+ return (dpo1->dpoi_index - dpo2->dpoi_index);
+}
+
+void
+dpo_copy (dpo_id_t *dst,
+ const dpo_id_t *src)
+{
+ dpo_id_t tmp = *dst;
+
+ /*
+ * the destination is written in a single u64 write - hence atomically w.r.t
+ * any packets inflight.
+ */
+ *((u64*)dst) = *(u64*)src;
+
+ dpo_lock(dst);
+ dpo_unlock(&tmp);
+}
+
+int
+dpo_is_adj (const dpo_id_t *dpo)
+{
+ return ((dpo->dpoi_type == DPO_ADJACENCY) ||
+ (dpo->dpoi_type == DPO_ADJACENCY_INCOMPLETE) ||
+ (dpo->dpoi_type == DPO_ADJACENCY_MIDCHAIN) ||
+ (dpo->dpoi_type == DPO_ADJACENCY_GLEAN));
+}
+
+void
+dpo_register (dpo_type_t type,
+ const dpo_vft_t *vft,
+ const char * const * const * nodes)
+{
+ vec_validate(dpo_vfts, type);
+ dpo_vfts[type] = *vft;
+
+ vec_validate(dpo_nodes, type);
+ dpo_nodes[type] = nodes;
+}
+
+dpo_type_t
+dpo_register_new_type (const dpo_vft_t *vft,
+ const char * const * const * nodes)
+{
+ dpo_type_t type = dpo_dynamic++;
+
+ dpo_register(type, vft, nodes);
+
+ return (type);
+}
+
+void
+dpo_lock (dpo_id_t *dpo)
+{
+ if (!dpo_id_is_valid(dpo))
+ return;
+
+ dpo_vfts[dpo->dpoi_type].dv_lock(dpo);
+}
+
+void
+dpo_unlock (dpo_id_t *dpo)
+{
+ if (!dpo_id_is_valid(dpo))
+ return;
+
+ dpo_vfts[dpo->dpoi_type].dv_unlock(dpo);
+}
+
+
+static u32
+dpo_get_next_node (dpo_type_t child_type,
+ dpo_proto_t child_proto,
+ const dpo_id_t *parent_dpo)
+{
+ dpo_proto_t parent_proto;
+ dpo_type_t parent_type;
+
+ parent_type = parent_dpo->dpoi_type;
+ parent_proto = parent_dpo->dpoi_proto;
+
+ vec_validate(dpo_edges, child_type);
+ vec_validate(dpo_edges[child_type], child_proto);
+ vec_validate(dpo_edges[child_type][child_proto], parent_type);
+ vec_validate_init_empty(
+ dpo_edges[child_type][child_proto][parent_type],
+ parent_proto, ~0);
+
+ /*
+ * if the edge index has not yet been created for this node to node transistion
+ */
+ if (~0 == dpo_edges[child_type][child_proto][parent_type][parent_proto])
+ {
+ vlib_node_t *parent_node, *child_node;
+ vlib_main_t *vm;
+ u32 edge ,pp, cc;
+
+ vm = vlib_get_main();
+
+ ASSERT(NULL != dpo_nodes[child_type]);
+ ASSERT(NULL != dpo_nodes[child_type][child_proto]);
+ ASSERT(NULL != dpo_nodes[parent_type]);
+ ASSERT(NULL != dpo_nodes[parent_type][parent_proto]);
+
+ cc = 0;
+
+ /*
+ * create a graph arc from each of the parent's registered node types,
+ * to each of the childs.
+ */
+ while (NULL != dpo_nodes[child_type][child_proto][cc])
+ {
+ child_node =
+ vlib_get_node_by_name(vm,
+ (u8*) dpo_nodes[child_type][child_proto][cc]);
+
+ pp = 0;
+
+ while (NULL != dpo_nodes[parent_type][parent_proto][pp])
+ {
+ parent_node =
+ vlib_get_node_by_name(vm,
+ (u8*) dpo_nodes[parent_type][parent_proto][pp]);
+
+ edge = vlib_node_add_next(vm,
+ child_node->index,
+ parent_node->index);
+
+ if (~0 == dpo_edges[child_type][child_proto][parent_type][parent_proto])
+ {
+ dpo_edges[child_type][child_proto][parent_type][parent_proto] = edge;
+ }
+ else
+ {
+ ASSERT(dpo_edges[child_type][child_proto][parent_type][parent_proto] == edge);
+ }
+ pp++;
+ }
+ cc++;
+ }
+ }
+
+ return (dpo_edges[child_type][child_proto][parent_type][parent_proto]);
+}
+
+/**
+ * @brief Stack one DPO object on another, and thus establish a child parent
+ * relationship. The VLIB graph arc used is taken from the parent and child types
+ * passed.
+ */
+static void
+dpo_stack_i (u32 edge,
+ dpo_id_t *dpo,
+ const dpo_id_t *parent)
+{
+ /*
+ * in order to get an atomic update of the parent we create a temporary,
+ * from a copy of the child, and add the next_node. then we copy to the parent
+ */
+ dpo_id_t tmp = DPO_INVALID;
+ dpo_copy(&tmp, parent);
+
+ /*
+ * get the edge index for the parent to child VLIB graph transisition
+ */
+ tmp.dpoi_next_node = edge;
+
+ /*
+ * this update is atomic.
+ */
+ dpo_copy(dpo, &tmp);
+
+ dpo_reset(&tmp);
+}
+
+/**
+ * @brief Stack one DPO object on another, and thus establish a child-parent
+ * relationship. The VLIB graph arc used is taken from the parent and child types
+ * passed.
+ */
+void
+dpo_stack (dpo_type_t child_type,
+ dpo_proto_t child_proto,
+ dpo_id_t *dpo,
+ const dpo_id_t *parent)
+{
+ dpo_stack_i(dpo_get_next_node(child_type, child_proto, parent), dpo, parent);
+}
+
+/**
+ * @brief Stack one DPO object on another, and thus establish a child parent
+ * relationship. A new VLIB graph arc is created from the child node passed
+ * to the nodes registered by the parent. The VLIB infra will ensure this arc
+ * is added only once.
+ */
+void
+dpo_stack_from_node (u32 child_node_index,
+ dpo_id_t *dpo,
+ const dpo_id_t *parent)
+{
+ dpo_proto_t parent_proto;
+ vlib_node_t *parent_node;
+ dpo_type_t parent_type;
+ vlib_main_t *vm;
+ u32 edge;
+
+ parent_type = parent->dpoi_type;
+ parent_proto = parent->dpoi_proto;
+
+ vm = vlib_get_main();
+
+ ASSERT(NULL != dpo_nodes[parent_type]);
+ ASSERT(NULL != dpo_nodes[parent_type][parent_proto]);
+
+ parent_node =
+ vlib_get_node_by_name(vm, (u8*) dpo_nodes[parent_type][parent_proto][0]);
+
+ edge = vlib_node_add_next(vm,
+ child_node_index,
+ parent_node->index);
+
+ dpo_stack_i(edge, dpo, parent);
+}
+
+static clib_error_t *
+dpo_module_init (vlib_main_t * vm)
+{
+ drop_dpo_module_init();
+ punt_dpo_module_init();
+ receive_dpo_module_init();
+ load_balance_module_init();
+ mpls_label_dpo_module_init();
+ classify_dpo_module_init();
+ lookup_dpo_module_init();
+ ip_null_dpo_module_init();
+
+ return (NULL);
+}
+
+VLIB_INIT_FUNCTION(dpo_module_init);
+
+static clib_error_t *
+dpo_memory_show (vlib_main_t * vm,
+ unformat_input_t * input,
+ vlib_cli_command_t * cmd)
+{
+ dpo_vft_t *vft;
+
+ vlib_cli_output (vm, "DPO memory");
+ vlib_cli_output (vm, "%=30s %=5s %=8s/%=9s totals",
+ "Name","Size", "in-use", "allocated");
+
+ vec_foreach(vft, dpo_vfts)
+ {
+ if (NULL != vft->dv_mem_show)
+ vft->dv_mem_show();
+ }
+
+ return (NULL);
+}
+
+/* *INDENT-OFF* */
+/*?
+ * The '<em>sh dpo memory </em>' command displays the memory usage for each
+ * data-plane object type.
+ *
+ * @cliexpar
+ * @cliexstart{show dpo memory}
+ * DPO memory
+ * Name Size in-use /allocated totals
+ * load-balance 64 12 / 12 768/768
+ * Adjacency 256 1 / 1 256/256
+ * Receive 24 5 / 5 120/120
+ * Lookup 12 0 / 0 0/0
+ * Classify 12 0 / 0 0/0
+ * MPLS label 24 0 / 0 0/0
+ * @cliexend
+?*/
+VLIB_CLI_COMMAND (show_fib_memory, static) = {
+ .path = "show dpo memory",
+ .function = dpo_memory_show,
+ .short_help = "show dpo memory",
+};
+/* *INDENT-ON* */
diff --git a/src/vnet/dpo/dpo.h b/src/vnet/dpo/dpo.h
new file mode 100644
index 00000000000..1efcbc8834b
--- /dev/null
+++ b/src/vnet/dpo/dpo.h
@@ -0,0 +1,381 @@
+/*
+ * 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.
+ */
+/**
+ * @brief
+ * A Data-Path Object is an object that represents actions that are
+ * applied to packets are they are switched through VPP's data-path.
+ *
+ * The DPO can be considered to be like is a base class that is specialised
+ * by other objects to provide concreate actions
+ *
+ * The VLIB graph nodes are graph of DPO types, the DPO graph is a graph of
+ * instances.
+ */
+
+#ifndef __DPO_H__
+#define __DPO_H__
+
+#include <vnet/vnet.h>
+
+/**
+ * @brief An index for adjacencies.
+ * Alas 'C' is not typesafe enough to b0rk when a u32 is used instead of
+ * an index_t. However, for us humans, we can glean much more intent
+ * from the declaration
+ * foo barindex_t t);
+ * than we can from
+ * foo bar(u32 t);
+ */
+typedef u32 index_t;
+
+/**
+ * @brief Invalid index - used when no index is known
+ * blazoned capitals INVALID speak volumes where ~0 does not.
+ */
+#define INDEX_INVALID ((index_t)(~0))
+
+/**
+ * @brief Data path protocol.
+ * Actions performed on packets in the data-plane can be described and represented
+ * by protocol independent objects, i.e. ADJACENCY, but the spceifics actions
+ * required during ADJACENCY processing can be protocol dependent. For example,
+ * the adjacency rewrite node performs a ip4 checksum calculation, ip6 and MPLS
+ * do not, all 3 perform a TTL decrement. The VLIB graph nodes are thus protocol
+ * dependent, and thus each graph edge/arc is too.
+ * When programming a DPO's next node arc from child to parent it is thus required
+ * to know the parent's data-path protocol so the correct arc index can be used.
+ */
+typedef enum dpo_proto_t_
+{
+#if CLIB_DEBUG > 0
+ DPO_PROTO_IP4 = 1,
+#else
+ DPO_PROTO_IP4 = 0,
+#endif
+ DPO_PROTO_IP6,
+ DPO_PROTO_ETHERNET,
+ DPO_PROTO_MPLS,
+} __attribute__((packed)) dpo_proto_t;
+
+#define DPO_PROTO_NUM ((dpo_proto_t)(DPO_PROTO_MPLS+1))
+#define DPO_PROTO_NONE ((dpo_proto_t)(DPO_PROTO_NUM+1))
+
+#define DPO_PROTOS { \
+ [DPO_PROTO_IP4] = "ip4", \
+ [DPO_PROTO_IP6] = "ip6", \
+ [DPO_PROTO_ETHERNET] = "ethernet", \
+ [DPO_PROTO_MPLS] = "mpls", \
+}
+
+#define FOR_EACH_DPO_PROTO(_proto) \
+ for (_proto = DPO_PROTO_IP4; \
+ _proto <= DPO_PROTO_MPLS; \
+ _proto++)
+
+/**
+ * @brief Common types of data-path objects
+ * New types can be dynamically added using dpo_register_new_type()
+ */
+typedef enum dpo_type_t_ {
+ /**
+ * A non-zero value first so we can spot unitialisation errors
+ */
+ DPO_FIRST,
+ DPO_DROP,
+ DPO_IP_NULL,
+ DPO_PUNT,
+ /**
+ * @brief load-balancing over a choice of [un]equal cost paths
+ */
+ DPO_LOAD_BALANCE,
+ DPO_ADJACENCY,
+ DPO_ADJACENCY_INCOMPLETE,
+ DPO_ADJACENCY_MIDCHAIN,
+ DPO_ADJACENCY_GLEAN,
+ DPO_RECEIVE,
+ DPO_LOOKUP,
+ DPO_LISP_CP,
+ DPO_CLASSIFY,
+ DPO_MPLS_LABEL,
+ DPO_LAST,
+} __attribute__((packed)) dpo_type_t;
+
+#define DPO_TYPE_NUM DPO_LAST
+
+#define DPO_TYPES { \
+ [DPO_FIRST] = "dpo-invalid", \
+ [DPO_DROP] = "dpo-drop", \
+ [DPO_IP_NULL] = "dpo-ip-null", \
+ [DPO_PUNT] = "dpo-punt", \
+ [DPO_ADJACENCY] = "dpo-adjacency", \
+ [DPO_ADJACENCY_INCOMPLETE] = "dpo-adjacency-incomplete", \
+ [DPO_ADJACENCY_MIDCHAIN] = "dpo-adjacency-midcahin", \
+ [DPO_ADJACENCY_GLEAN] = "dpo-glean", \
+ [DPO_RECEIVE] = "dpo-receive", \
+ [DPO_LOOKUP] = "dpo-lookup", \
+ [DPO_LOAD_BALANCE] = "dpo-load-balance", \
+ [DPO_LISP_CP] = "dpo-lisp-cp", \
+ [DPO_CLASSIFY] = "dpo-classify", \
+ [DPO_MPLS_LABEL] = "dpo-mpls-label" \
+}
+
+/**
+ * @brief The identity of a DPO is a combination of its type and its
+ * instance number/index of objects of that type
+ */
+typedef struct dpo_id_t_ {
+ /**
+ * the type
+ */
+ dpo_type_t dpoi_type;
+ /**
+ * the data-path protocol of the type.
+ */
+ dpo_proto_t dpoi_proto;
+ /**
+ * The next VLIB node to follow.
+ */
+ u16 dpoi_next_node;
+ /**
+ * the index of objects of that type
+ */
+ index_t dpoi_index;
+} __attribute__ ((aligned(sizeof(u64)))) dpo_id_t;
+
+STATIC_ASSERT(sizeof(dpo_id_t) <= sizeof(u64),
+ "DPO ID is greater than sizeof u64 "
+ "atomic updates need to be revisited");
+
+/**
+ * @brief An initialiser for DPOs declared on the stack.
+ * Thenext node is set to 0 since VLIB graph nodes should set 0 index to drop.
+ */
+#define DPO_INVALID \
+{ \
+ .dpoi_type = DPO_FIRST, \
+ .dpoi_proto = DPO_PROTO_NONE, \
+ .dpoi_index = INDEX_INVALID, \
+ .dpoi_next_node = 0, \
+}
+
+/**
+ * @brief Return true if the DPO object is valid, i.e. has been initialised.
+ */
+static inline int
+dpo_id_is_valid (const dpo_id_t *dpoi)
+{
+ return (dpoi->dpoi_type != DPO_FIRST &&
+ dpoi->dpoi_index != INDEX_INVALID);
+}
+
+extern dpo_proto_t vnet_link_to_dpo_proto(vnet_link_t linkt);
+
+/**
+ * @brief
+ * Take a reference counting lock on the DPO
+ */
+extern void dpo_lock(dpo_id_t *dpo);
+
+/**
+ * @brief
+ * Release a reference counting lock on the DPO
+ */
+extern void dpo_unlock(dpo_id_t *dpo);
+
+/**
+ * @brief Set/create a DPO ID
+ * The DPO will be locked.
+ *
+ * @param dpo
+ * The DPO object to configure
+ *
+ * @param type
+ * The dpo_type_t of the DPO
+ *
+ * @param proto
+ * The dpo_proto_t of the DPO
+ *
+ * @param index
+ * The type specific index of the DPO
+ */
+extern void dpo_set(dpo_id_t *dpo,
+ dpo_type_t type,
+ dpo_proto_t proto,
+ index_t index);
+
+/**
+ * @brief reset a DPO ID
+ * The DPO will be unlocked.
+ *
+ * @param dpo
+ * The DPO object to reset
+ */
+extern void dpo_reset(dpo_id_t *dpo);
+
+/**
+ * @brief compare two DPOs for equality
+ */
+extern int dpo_cmp(const dpo_id_t *dpo1,
+ const dpo_id_t *dpo2);
+
+/**
+ * @brief
+ * atomic copy a data-plane object.
+ * This is safe to use when the dst DPO is currently switching packets
+ */
+extern void dpo_copy(dpo_id_t *dst,
+ const dpo_id_t *src);
+
+/**
+ * @brief Return TRUE is the DPO is any type of adjacency
+ */
+extern int dpo_is_adj(const dpo_id_t *dpo);
+
+/**
+ * @biref Format a DPO_id_t oject
+ */
+extern u8 *format_dpo_id(u8 * s, va_list * args);
+
+/**
+ * @biref format a DPO type
+ */
+extern u8 *format_dpo_type(u8 * s, va_list * args);
+
+/**
+ * @brief format a DPO protocol
+ */
+extern u8 *format_dpo_proto(u8 * s, va_list * args);
+
+/**
+ * @brief
+ * Set and stack a DPO.
+ * The DPO passed is set to the parent DPO and the necessary
+ * VLIB graph arcs are created. The child_type and child_proto
+ * are used to get the VLID nodes from which the arcs are added.
+ *
+ * @param child_type
+ * Child DPO type.
+ *
+ * @param child_proto
+ * Child DPO proto
+ *
+ * @parem dpo
+ * This is the DPO to stack and set.
+ *
+ * @paren parent_dpo
+ * The parent DPO to stack onto.
+ */
+extern void dpo_stack(dpo_type_t child_type,
+ dpo_proto_t child_proto,
+ dpo_id_t *dpo,
+ const dpo_id_t *parent_dpo);
+
+/**
+ * @brief
+ * Set and stack a DPO.
+ * The DPO passed is set to the parent DPO and the necessary
+ * VLIB graph arcs are created, from the child_node passed.
+ *
+ * @param child_node
+ * The VLIB grpah node index to create an arc from to the parent
+ *
+ * @parem dpo
+ * This is the DPO to stack and set.
+ *
+ * @paren parent_dpo
+ * The parent DPO to stack onto.
+ */
+extern void dpo_stack_from_node(u32 child_node,
+ dpo_id_t *dpo,
+ const dpo_id_t *parent);
+
+/**
+ * @brief A lock function registered for a DPO type
+ */
+typedef void (*dpo_lock_fn_t)(dpo_id_t *dpo);
+
+/**
+ * @brief An unlock function registered for a DPO type
+ */
+typedef void (*dpo_unlock_fn_t)(dpo_id_t *dpo);
+
+/**
+ * @brief An memory usage show command
+ */
+typedef void (*dpo_mem_show_t)(void);
+
+/**
+ * @brief A virtual function table regisitered for a DPO type
+ */
+typedef struct dpo_vft_t_
+{
+ /**
+ * A reference counting lock function
+ */
+ dpo_lock_fn_t dv_lock;
+ /**
+ * A reference counting unlock function
+ */
+ dpo_lock_fn_t dv_unlock;
+ /**
+ * A format function
+ */
+ format_function_t *dv_format;
+ /**
+ * A show memory usage function
+ */
+ dpo_mem_show_t dv_mem_show;
+} dpo_vft_t;
+
+
+/**
+ * @brief For a given DPO type Register:
+ * - a virtual function table
+ * - a NULL terminated array of graph nodes from which that object type
+ * will originate packets, i.e. the nodes in which the object type will be
+ * the parent DPO in the DP graph. The ndoes are per-data-path protocol
+ * (see above).
+ *
+ * @param type
+ * The type being registered.
+ *
+ * @param vft
+ * The virtual function table to register for the type.
+ *
+ * @param nodes
+ * The string description of the per-protocol VLIB graph nodes.
+ */
+extern void dpo_register(dpo_type_t type,
+ const dpo_vft_t *vft,
+ const char * const * const * nodes);
+
+/**
+ * @brief Create and register a new DPO type.
+ *
+ * This can be used by plugins to create new DPO types that are not listed
+ * in dpo_type_t enum
+ *
+ * @param vft
+ * The virtual function table to register for the type.
+ *
+ * @param nodes
+ * The string description of the per-protocol VLIB graph nodes.
+ *
+ * @return The new dpo_type_t
+ */
+extern dpo_type_t dpo_register_new_type(const dpo_vft_t *vft,
+ const char * const * const * nodes);
+
+#endif
diff --git a/src/vnet/dpo/drop_dpo.c b/src/vnet/dpo/drop_dpo.c
new file mode 100644
index 00000000000..5118d2a45b7
--- /dev/null
+++ b/src/vnet/dpo/drop_dpo.c
@@ -0,0 +1,106 @@
+/*
+ * 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.
+ */
+/**
+ * @brief
+ * The data-path object representing dropping the packet
+ */
+
+#include <vnet/dpo/dpo.h>
+
+static dpo_id_t drop_dpos[DPO_PROTO_NUM];
+
+const dpo_id_t *
+drop_dpo_get (dpo_proto_t proto)
+{
+ dpo_set(&drop_dpos[proto], DPO_DROP, proto, proto);
+
+ return (&drop_dpos[proto]);
+}
+
+int
+dpo_is_drop (const dpo_id_t *dpo)
+{
+ return (dpo->dpoi_type == DPO_DROP);
+}
+
+static void
+drop_dpo_lock (dpo_id_t *dpo)
+{
+ /*
+ * not maintaining a lock count on the drop
+ * more trouble than it's worth.
+ * There always needs to be one around. no point it managaing its lifetime
+ */
+}
+static void
+drop_dpo_unlock (dpo_id_t *dpo)
+{
+}
+
+static u8*
+format_drop_dpo (u8 *s, va_list *ap)
+{
+ CLIB_UNUSED(index_t index) = va_arg(*ap, index_t);
+ CLIB_UNUSED(u32 indent) = va_arg(*ap, u32);
+
+ return (format(s, "dpo-drop %U", format_dpo_proto, index));
+}
+
+const static dpo_vft_t drop_vft = {
+ .dv_lock = drop_dpo_lock,
+ .dv_unlock = drop_dpo_unlock,
+ .dv_format = format_drop_dpo,
+};
+
+/**
+ * @brief The per-protocol VLIB graph nodes that are assigned to a drop
+ * object.
+ *
+ * this means that these graph nodes are ones from which a drop is the
+ * parent object in the DPO-graph.
+ */
+const static char* const drop_ip4_nodes[] =
+{
+ "ip4-drop",
+ NULL,
+};
+const static char* const drop_ip6_nodes[] =
+{
+ "ip6-drop",
+ NULL,
+};
+const static char* const drop_mpls_nodes[] =
+{
+ "mpls-drop",
+ NULL,
+};
+const static char* const drop_ethernet_nodes[] =
+{
+ "error-drop",
+ NULL,
+};
+const static char* const * const drop_nodes[DPO_PROTO_NUM] =
+{
+ [DPO_PROTO_IP4] = drop_ip4_nodes,
+ [DPO_PROTO_IP6] = drop_ip6_nodes,
+ [DPO_PROTO_MPLS] = drop_mpls_nodes,
+ [DPO_PROTO_ETHERNET] = drop_ethernet_nodes,
+};
+
+void
+drop_dpo_module_init (void)
+{
+ dpo_register(DPO_DROP, &drop_vft, drop_nodes);
+}
diff --git a/src/vnet/dpo/drop_dpo.h b/src/vnet/dpo/drop_dpo.h
new file mode 100644
index 00000000000..436df36c84e
--- /dev/null
+++ b/src/vnet/dpo/drop_dpo.h
@@ -0,0 +1,31 @@
+/*
+ * 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.
+ */
+/**
+ * @brief The Drop DPO will drop all packets, no questions asked. It is valid
+ * for any packet protocol.
+ */
+
+#ifndef __DROP_DPO_H__
+#define __DROP_DPO_H__
+
+#include <vnet/dpo/dpo.h>
+
+extern int dpo_is_drop(const dpo_id_t *dpo);
+
+extern const dpo_id_t *drop_dpo_get(dpo_proto_t proto);
+
+extern void drop_dpo_module_init(void);
+
+#endif
diff --git a/src/vnet/dpo/ip_null_dpo.c b/src/vnet/dpo/ip_null_dpo.c
new file mode 100644
index 00000000000..22682e4eee4
--- /dev/null
+++ b/src/vnet/dpo/ip_null_dpo.c
@@ -0,0 +1,408 @@
+/*
+ * 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.
+ */
+/**
+ * @brief
+ * The data-path object representing dropping the packet
+ */
+
+#include <vnet/dpo/ip_null_dpo.h>
+#include <vnet/ip/ip.h>
+
+/**
+ * @brief A representation of the IP_NULL DPO
+ */
+typedef struct ip_null_dpo_t_
+{
+ /**
+ * @brief The action to take on a packet
+ */
+ ip_null_dpo_action_t ind_action;
+ /**
+ * @brief The next VLIB node
+ */
+ u32 ind_next_index;
+ /**
+ * rate limits
+ */
+} ip_null_dpo_t;
+
+/**
+ * @brief the IP_NULL dpos are shared by all routes, hence they are global.
+ * As the neame implies this is only for IP, hence 2.
+ */
+static ip_null_dpo_t ip_null_dpos[2 * IP_NULL_DPO_ACTION_NUM] = {
+ [0] = {
+ /* proto ip4, no action */
+ .ind_action = IP_NULL_ACTION_NONE,
+ },
+ [1] = {
+ /* proto ip4, action send unreach */
+ .ind_action = IP_NULL_ACTION_SEND_ICMP_UNREACH,
+ },
+ [2] = {
+ /* proto ip4, action send unreach */
+ .ind_action = IP_NULL_ACTION_SEND_ICMP_PROHIBIT,
+ },
+ [3] = {
+ /* proto ip6, no action */
+ .ind_action = IP_NULL_ACTION_NONE,
+ },
+ [4] = {
+ /* proto ip6, action send unreach */
+ .ind_action = IP_NULL_ACTION_SEND_ICMP_UNREACH,
+ },
+ [5] = {
+ /* proto ip6, action send unreach */
+ .ind_action = IP_NULL_ACTION_SEND_ICMP_PROHIBIT,
+ },
+};
+
+/**
+ * @brief Action strings
+ */
+const char *ip_null_action_strings[] = IP_NULL_ACTIONS;
+
+void
+ip_null_dpo_add_and_lock (dpo_proto_t proto,
+ ip_null_dpo_action_t action,
+ dpo_id_t *dpo)
+{
+ int i;
+
+ ASSERT((proto == DPO_PROTO_IP4) ||
+ (proto == DPO_PROTO_IP6));
+ ASSERT(action < IP_NULL_DPO_ACTION_NUM);
+
+ i = (proto == DPO_PROTO_IP4 ? 0 : 1);
+
+ dpo_set(dpo, DPO_IP_NULL, proto, (i*IP_NULL_DPO_ACTION_NUM) + action);
+}
+
+always_inline const ip_null_dpo_t*
+ip_null_dpo_get (index_t indi)
+{
+ return (&ip_null_dpos[indi]);
+}
+
+static void
+ip_null_dpo_lock (dpo_id_t *dpo)
+{
+ /*
+ * not maintaining a lock count on the ip_null, they are const global and
+ * never die.
+ */
+}
+static void
+ip_null_dpo_unlock (dpo_id_t *dpo)
+{
+}
+
+static u8*
+format_ip_null_dpo (u8 *s, va_list *ap)
+{
+ index_t index = va_arg(*ap, index_t);
+ CLIB_UNUSED(u32 indent) = va_arg(*ap, u32);
+ const ip_null_dpo_t *ind;
+ dpo_proto_t proto;
+
+ ind = ip_null_dpo_get(index);
+ proto = (index < IP_NULL_DPO_ACTION_NUM ? DPO_PROTO_IP4 : DPO_PROTO_IP6);
+
+ return (format(s, "%U-null action:%s",
+ format_dpo_proto, proto,
+ ip_null_action_strings[ind->ind_action]));
+}
+
+const static dpo_vft_t ip_null_vft = {
+ .dv_lock = ip_null_dpo_lock,
+ .dv_unlock = ip_null_dpo_unlock,
+ .dv_format = format_ip_null_dpo,
+};
+
+/**
+ * @brief The per-protocol VLIB graph nodes that are assigned to a ip_null
+ * object.
+ *
+ * this means that these graph nodes are ones from which a ip_null is the
+ * parent object in the DPO-graph.
+ */
+const static char* const ip4_null_nodes[] =
+{
+ "ip4-null",
+ NULL,
+};
+const static char* const ip6_null_nodes[] =
+{
+ "ip6-null",
+ NULL,
+};
+
+const static char* const * const ip_null_nodes[DPO_PROTO_NUM] =
+{
+ [DPO_PROTO_IP4] = ip4_null_nodes,
+ [DPO_PROTO_IP6] = ip6_null_nodes,
+};
+
+typedef struct ip_null_dpo_trace_t_
+{
+ index_t ind_index;
+} ip_null_dpo_trace_t;
+
+/**
+ * @brief Exit nodes from a IP_NULL
+ */
+typedef enum ip_null_next_t_
+{
+ IP_NULL_NEXT_DROP,
+ IP_NULL_NEXT_ICMP,
+ IP_NULL_NEXT_NUM,
+} ip_null_next_t;
+
+always_inline uword
+ip_null_dpo_switch (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame,
+ u8 is_ip4)
+{
+ u32 n_left_from, next_index, *from, *to_next;
+ static f64 time_last_seed_change = -1e100;
+ static u32 hash_seeds[3];
+ static uword hash_bitmap[256 / BITS (uword)];
+ f64 time_now;
+
+ from = vlib_frame_vector_args (frame);
+ n_left_from = frame->n_vectors;
+
+ time_now = vlib_time_now (vm);
+ if (time_now - time_last_seed_change > 1e-1)
+ {
+ uword i;
+ u32 * r = clib_random_buffer_get_data (&vm->random_buffer,
+ sizeof (hash_seeds));
+ for (i = 0; i < ARRAY_LEN (hash_seeds); i++)
+ hash_seeds[i] = r[i];
+
+ /* Mark all hash keys as been not-seen before. */
+ for (i = 0; i < ARRAY_LEN (hash_bitmap); i++)
+ hash_bitmap[i] = 0;
+
+ time_last_seed_change = time_now;
+ }
+
+ 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 > 0 && n_left_to_next > 0)
+ {
+ u32 a0, b0, c0, m0, drop0;
+ vlib_buffer_t *p0;
+ u32 bi0, indi0, next0;
+ const ip_null_dpo_t *ind0;
+ uword bm0;
+
+ bi0 = from[0];
+ to_next[0] = bi0;
+ from += 1;
+ to_next += 1;
+ n_left_from -= 1;
+ n_left_to_next -= 1;
+
+ p0 = vlib_get_buffer (vm, bi0);
+
+ /* lookup dst + src mac */
+ indi0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
+ ind0 = ip_null_dpo_get(indi0);
+ next0 = IP_NULL_NEXT_DROP;
+
+ /*
+ * rate limit - don't DoS the sender.
+ */
+ a0 = hash_seeds[0];
+ b0 = hash_seeds[1];
+ c0 = hash_seeds[2];
+
+ if (is_ip4)
+ {
+ ip4_header_t *ip0 = vlib_buffer_get_current (p0);
+
+ a0 ^= ip0->dst_address.data_u32;
+ b0 ^= ip0->src_address.data_u32;
+
+ hash_v3_finalize32 (a0, b0, c0);
+ }
+ else
+ {
+ ip6_header_t *ip0 = vlib_buffer_get_current (p0);
+
+ a0 ^= ip0->dst_address.as_u32[0];
+ b0 ^= ip0->src_address.as_u32[0];
+ c0 ^= ip0->src_address.as_u32[1];
+
+ hash_v3_mix32 (a0, b0, c0);
+
+ a0 ^= ip0->dst_address.as_u32[1];
+ b0 ^= ip0->src_address.as_u32[2];
+ c0 ^= ip0->src_address.as_u32[3];
+
+ hash_v3_finalize32 (a0, b0, c0);
+ }
+
+ c0 &= BITS (hash_bitmap) - 1;
+ c0 = c0 / BITS (uword);
+ m0 = (uword) 1 << (c0 % BITS (uword));
+
+ bm0 = hash_bitmap[c0];
+ drop0 = (bm0 & m0) != 0;
+
+ /* Mark it as seen. */
+ hash_bitmap[c0] = bm0 | m0;
+
+ if (PREDICT_FALSE(!drop0))
+ {
+ if (is_ip4)
+ {
+ /*
+ * There's a trade-off here. This conditinal statement
+ * versus a graph node per-condition. Given the number
+ * expect number of packets to reach a null route is 0
+ * we favour the run-time cost over the graph complexity
+ */
+ if (IP_NULL_ACTION_SEND_ICMP_UNREACH == ind0->ind_action)
+ {
+ next0 = IP_NULL_NEXT_ICMP;
+ icmp4_error_set_vnet_buffer(
+ p0,
+ ICMP4_destination_unreachable,
+ ICMP4_destination_unreachable_destination_unreachable_host,
+ 0);
+ }
+ else if (IP_NULL_ACTION_SEND_ICMP_PROHIBIT == ind0->ind_action)
+ {
+ next0 = IP_NULL_NEXT_ICMP;
+ icmp4_error_set_vnet_buffer(
+ p0,
+ ICMP4_destination_unreachable,
+ ICMP4_destination_unreachable_host_administratively_prohibited,
+ 0);
+ }
+ }
+ else
+ {
+ if (IP_NULL_ACTION_SEND_ICMP_UNREACH == ind0->ind_action)
+ {
+ next0 = IP_NULL_NEXT_ICMP;
+ icmp6_error_set_vnet_buffer(
+ p0,
+ ICMP6_destination_unreachable,
+ ICMP6_destination_unreachable_no_route_to_destination,
+ 0);
+ }
+ else if (IP_NULL_ACTION_SEND_ICMP_PROHIBIT == ind0->ind_action)
+ {
+ next0 = IP_NULL_NEXT_ICMP;
+ icmp6_error_set_vnet_buffer(
+ p0,
+ ICMP6_destination_unreachable,
+ ICMP6_destination_unreachable_destination_administratively_prohibited,
+ 0);
+ }
+ }
+ }
+
+ if (PREDICT_FALSE (p0->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ ip_null_dpo_trace_t *tr = vlib_add_trace (vm, node, p0,
+ sizeof (*tr));
+ tr->ind_index = indi0;
+ }
+ 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;
+}
+
+static u8 *
+format_ip_null_dpo_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 *);
+ ip_null_dpo_trace_t *t = va_arg (*args, ip_null_dpo_trace_t *);
+
+ s = format (s, "%U", format_ip_null_dpo, t->ind_index, 0);
+ return s;
+}
+
+static uword
+ip4_null_dpo_switch (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ return (ip_null_dpo_switch(vm, node, frame, 1));
+}
+
+/**
+ * @brief
+ */
+VLIB_REGISTER_NODE (ip4_null_dpo_node) = {
+ .function = ip4_null_dpo_switch,
+ .name = "ip4-null",
+ .vector_size = sizeof (u32),
+
+ .format_trace = format_ip_null_dpo_trace,
+ .n_next_nodes = IP_NULL_NEXT_NUM,
+ .next_nodes = {
+ [IP_NULL_NEXT_DROP] = "ip4-drop",
+ [IP_NULL_NEXT_ICMP] = "ip4-icmp-error",
+ },
+};
+
+static uword
+ip6_null_dpo_switch (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ return (ip_null_dpo_switch(vm, node, frame, 0));
+}
+
+/**
+ * @brief
+ */
+VLIB_REGISTER_NODE (ip6_null_dpo_node) = {
+ .function = ip6_null_dpo_switch,
+ .name = "ip6-null",
+ .vector_size = sizeof (u32),
+
+ .format_trace = format_ip_null_dpo_trace,
+ .n_next_nodes = IP_NULL_NEXT_NUM,
+ .next_nodes = {
+ [IP_NULL_NEXT_DROP] = "ip6-drop",
+ [IP_NULL_NEXT_ICMP] = "ip6-icmp-error",
+ },
+};
+
+void
+ip_null_dpo_module_init (void)
+{
+ dpo_register(DPO_IP_NULL, &ip_null_vft, ip_null_nodes);
+}
diff --git a/src/vnet/dpo/ip_null_dpo.h b/src/vnet/dpo/ip_null_dpo.h
new file mode 100644
index 00000000000..002a2a7016d
--- /dev/null
+++ b/src/vnet/dpo/ip_null_dpo.h
@@ -0,0 +1,56 @@
+/*
+ * 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.
+ */
+/**
+ * @brief
+ * The IP NULL DPO represents the rubbish bin for IP traffic. Without specifying an
+ * action (i.e. send IMCP type X to sender) it is equivalent to using a drop DPO.
+ * However, in contrast to the drop DPO any route that resovles via a NULL, is
+ * considered to 'resolved' by FIB, i.e. a IP NULL is used when the control plane
+ * is explicitly expressing the desire to drop packets. Drop DPOs are used
+ * internally by FIB when resolution is not possible.
+ *
+ * Any replies to sender are rate limited.
+ */
+
+#ifndef __IP_NULL_DPO_H__
+#define __IP_NULL_DPO_H__
+
+#include <vnet/dpo/dpo.h>
+
+/**
+ * @brief Actions to take when a packet encounters the NULL DPO
+ */
+typedef enum ip_null_dpo_action_t_
+{
+ IP_NULL_ACTION_NONE,
+ IP_NULL_ACTION_SEND_ICMP_UNREACH,
+ IP_NULL_ACTION_SEND_ICMP_PROHIBIT,
+} ip_null_dpo_action_t;
+
+#define IP_NULL_ACTIONS { \
+ [IP_NULL_ACTION_NONE] = "discard", \
+ [IP_NULL_ACTION_SEND_ICMP_UNREACH] = "send-unreachable", \
+ [IP_NULL_ACTION_SEND_ICMP_PROHIBIT] = "send-prohibited", \
+}
+
+#define IP_NULL_DPO_ACTION_NUM (IP_NULL_ACTION_SEND_ICMP_PROHIBIT+1)
+
+extern void ip_null_dpo_add_and_lock (dpo_proto_t proto,
+ ip_null_dpo_action_t action,
+ dpo_id_t *dpo);
+
+extern void ip_null_dpo_module_init(void);
+
+#endif
diff --git a/src/vnet/dpo/load_balance.c b/src/vnet/dpo/load_balance.c
new file mode 100644
index 00000000000..a244776ffb8
--- /dev/null
+++ b/src/vnet/dpo/load_balance.c
@@ -0,0 +1,993 @@
+/*
+ * 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 <vnet/ip/lookup.h>
+#include <vnet/dpo/load_balance.h>
+#include <vnet/dpo/load_balance_map.h>
+#include <vnet/dpo/drop_dpo.h>
+#include <vppinfra/math.h> /* for fabs */
+#include <vnet/adj/adj.h>
+#include <vnet/adj/adj_internal.h>
+#include <vnet/fib/fib_urpf_list.h>
+
+/*
+ * distribution error tolerance for load-balancing
+ */
+const f64 multipath_next_hop_error_tolerance = 0.1;
+
+#undef LB_DEBUG
+
+#ifdef LB_DEBUG
+#define LB_DBG(_lb, _fmt, _args...) \
+{ \
+ u8* _tmp =NULL; \
+ clib_warning("lb:[%s]:" _fmt, \
+ load_balance_format(load_balance_get_index((_lb)), \
+ 0, _tmp), \
+ ##_args); \
+ vec_free(_tmp); \
+}
+#else
+#define LB_DBG(_p, _fmt, _args...)
+#endif
+
+
+/**
+ * Pool of all DPOs. It's not static so the DP can have fast access
+ */
+load_balance_t *load_balance_pool;
+
+/**
+ * The one instance of load-balance main
+ */
+load_balance_main_t load_balance_main;
+
+f64
+load_balance_get_multipath_tolerance (void)
+{
+ return (multipath_next_hop_error_tolerance);
+}
+
+static inline index_t
+load_balance_get_index (const load_balance_t *lb)
+{
+ return (lb - load_balance_pool);
+}
+
+static inline dpo_id_t*
+load_balance_get_buckets (load_balance_t *lb)
+{
+ if (LB_HAS_INLINE_BUCKETS(lb))
+ {
+ return (lb->lb_buckets_inline);
+ }
+ else
+ {
+ return (lb->lb_buckets);
+ }
+}
+
+static load_balance_t *
+load_balance_alloc_i (void)
+{
+ load_balance_t *lb;
+
+ pool_get_aligned(load_balance_pool, lb, CLIB_CACHE_LINE_BYTES);
+ memset(lb, 0, sizeof(*lb));
+
+ lb->lb_map = INDEX_INVALID;
+ lb->lb_urpf = INDEX_INVALID;
+ vlib_validate_combined_counter(&(load_balance_main.lbm_to_counters),
+ load_balance_get_index(lb));
+ vlib_validate_combined_counter(&(load_balance_main.lbm_via_counters),
+ load_balance_get_index(lb));
+ vlib_zero_combined_counter(&(load_balance_main.lbm_to_counters),
+ load_balance_get_index(lb));
+ vlib_zero_combined_counter(&(load_balance_main.lbm_via_counters),
+ load_balance_get_index(lb));
+
+ return (lb);
+}
+
+static u8*
+load_balance_format (index_t lbi,
+ load_balance_format_flags_t flags,
+ u32 indent,
+ u8 *s)
+{
+ vlib_counter_t to, via;
+ load_balance_t *lb;
+ dpo_id_t *buckets;
+ u32 i;
+
+ lb = load_balance_get(lbi);
+ vlib_get_combined_counter(&(load_balance_main.lbm_to_counters), lbi, &to);
+ vlib_get_combined_counter(&(load_balance_main.lbm_via_counters), lbi, &via);
+ buckets = load_balance_get_buckets(lb);
+
+ s = format(s, "%U: ", format_dpo_type, DPO_LOAD_BALANCE);
+ s = format(s, "[index:%d buckets:%d ", lbi, lb->lb_n_buckets);
+ s = format(s, "uRPF:%d ", lb->lb_urpf);
+ s = format(s, "to:[%Ld:%Ld]", to.packets, to.bytes);
+ if (0 != via.packets)
+ {
+ s = format(s, " via:[%Ld:%Ld]",
+ via.packets, via.bytes);
+ }
+ s = format(s, "]");
+
+ if (INDEX_INVALID != lb->lb_map)
+ {
+ s = format(s, "\n%U%U",
+ format_white_space, indent+4,
+ format_load_balance_map, lb->lb_map, indent+4);
+ }
+ for (i = 0; i < lb->lb_n_buckets; i++)
+ {
+ s = format(s, "\n%U[%d] %U",
+ format_white_space, indent+2,
+ i,
+ format_dpo_id,
+ &buckets[i], indent+6);
+ }
+ return (s);
+}
+
+u8*
+format_load_balance (u8 * s, va_list * args)
+{
+ index_t lbi = va_arg(*args, index_t);
+ load_balance_format_flags_t flags = va_arg(*args, load_balance_format_flags_t);
+
+ return (load_balance_format(lbi, flags, 0, s));
+}
+static u8*
+format_load_balance_dpo (u8 * s, va_list * args)
+{
+ index_t lbi = va_arg(*args, index_t);
+ u32 indent = va_arg(*args, u32);
+
+ return (load_balance_format(lbi, LOAD_BALANCE_FORMAT_DETAIL, indent, s));
+}
+
+
+static load_balance_t *
+load_balance_create_i (u32 num_buckets,
+ dpo_proto_t lb_proto,
+ flow_hash_config_t fhc)
+{
+ load_balance_t *lb;
+
+ lb = load_balance_alloc_i();
+ lb->lb_hash_config = fhc;
+ lb->lb_n_buckets = num_buckets;
+ lb->lb_n_buckets_minus_1 = num_buckets-1;
+ lb->lb_proto = lb_proto;
+
+ if (!LB_HAS_INLINE_BUCKETS(lb))
+ {
+ vec_validate_aligned(lb->lb_buckets,
+ lb->lb_n_buckets - 1,
+ CLIB_CACHE_LINE_BYTES);
+ }
+
+ LB_DBG(lb, "create");
+
+ return (lb);
+}
+
+index_t
+load_balance_create (u32 n_buckets,
+ dpo_proto_t lb_proto,
+ flow_hash_config_t fhc)
+{
+ return (load_balance_get_index(load_balance_create_i(n_buckets, lb_proto, fhc)));
+}
+
+static inline void
+load_balance_set_bucket_i (load_balance_t *lb,
+ u32 bucket,
+ dpo_id_t *buckets,
+ const dpo_id_t *next)
+{
+ dpo_stack(DPO_LOAD_BALANCE, lb->lb_proto, &buckets[bucket], next);
+}
+
+void
+load_balance_set_bucket (index_t lbi,
+ u32 bucket,
+ const dpo_id_t *next)
+{
+ load_balance_t *lb;
+ dpo_id_t *buckets;
+
+ lb = load_balance_get(lbi);
+ buckets = load_balance_get_buckets(lb);
+
+ ASSERT(bucket < lb->lb_n_buckets);
+
+ load_balance_set_bucket_i(lb, bucket, buckets, next);
+}
+
+int
+load_balance_is_drop (const dpo_id_t *dpo)
+{
+ load_balance_t *lb;
+
+ if (DPO_LOAD_BALANCE != dpo->dpoi_type)
+ return (0);
+
+ lb = load_balance_get(dpo->dpoi_index);
+
+ if (1 == lb->lb_n_buckets)
+ {
+ return (dpo_is_drop(load_balance_get_bucket_i(lb, 0)));
+ }
+ return (0);
+}
+
+void
+load_balance_set_urpf (index_t lbi,
+ index_t urpf)
+{
+ load_balance_t *lb;
+ index_t old;
+
+ lb = load_balance_get(lbi);
+
+ /*
+ * packets in flight we see this change. but it's atomic, so :P
+ */
+ old = lb->lb_urpf;
+ lb->lb_urpf = urpf;
+
+ fib_urpf_list_unlock(old);
+ fib_urpf_list_lock(urpf);
+}
+
+index_t
+load_balance_get_urpf (index_t lbi)
+{
+ load_balance_t *lb;
+
+ lb = load_balance_get(lbi);
+
+ return (lb->lb_urpf);
+}
+
+const dpo_id_t *
+load_balance_get_bucket (index_t lbi,
+ u32 bucket)
+{
+ load_balance_t *lb;
+
+ lb = load_balance_get(lbi);
+
+ return (load_balance_get_bucket_i(lb, bucket));
+}
+
+static int
+next_hop_sort_by_weight (load_balance_path_t * n1,
+ load_balance_path_t * n2)
+{
+ return ((int) n1->path_weight - (int) n2->path_weight);
+}
+
+/* Given next hop vector is over-written with normalized one with sorted weights and
+ with weights corresponding to the number of adjacencies for each next hop.
+ Returns number of adjacencies in block. */
+u32
+ip_multipath_normalize_next_hops (load_balance_path_t * raw_next_hops,
+ load_balance_path_t ** normalized_next_hops,
+ u32 *sum_weight_in,
+ f64 multipath_next_hop_error_tolerance)
+{
+ load_balance_path_t * nhs;
+ uword n_nhs, n_adj, n_adj_left, i, sum_weight;
+ f64 norm, error;
+
+ n_nhs = vec_len (raw_next_hops);
+ ASSERT (n_nhs > 0);
+ if (n_nhs == 0)
+ return 0;
+
+ /* Allocate enough space for 2 copies; we'll use second copy to save original weights. */
+ nhs = *normalized_next_hops;
+ vec_validate (nhs, 2*n_nhs - 1);
+
+ /* Fast path: 1 next hop in block. */
+ n_adj = n_nhs;
+ if (n_nhs == 1)
+ {
+ nhs[0] = raw_next_hops[0];
+ nhs[0].path_weight = 1;
+ _vec_len (nhs) = 1;
+ sum_weight = 1;
+ goto done;
+ }
+
+ else if (n_nhs == 2)
+ {
+ int cmp = next_hop_sort_by_weight (&raw_next_hops[0], &raw_next_hops[1]) < 0;
+
+ /* Fast sort. */
+ nhs[0] = raw_next_hops[cmp];
+ nhs[1] = raw_next_hops[cmp ^ 1];
+
+ /* Fast path: equal cost multipath with 2 next hops. */
+ if (nhs[0].path_weight == nhs[1].path_weight)
+ {
+ nhs[0].path_weight = nhs[1].path_weight = 1;
+ _vec_len (nhs) = 2;
+ sum_weight = 2;
+ goto done;
+ }
+ }
+ else
+ {
+ clib_memcpy (nhs, raw_next_hops, n_nhs * sizeof (raw_next_hops[0]));
+ qsort (nhs, n_nhs, sizeof (nhs[0]), (void *) next_hop_sort_by_weight);
+ }
+
+ /* Find total weight to normalize weights. */
+ sum_weight = 0;
+ for (i = 0; i < n_nhs; i++)
+ sum_weight += nhs[i].path_weight;
+
+ /* In the unlikely case that all weights are given as 0, set them all to 1. */
+ if (sum_weight == 0)
+ {
+ for (i = 0; i < n_nhs; i++)
+ nhs[i].path_weight = 1;
+ sum_weight = n_nhs;
+ }
+
+ /* Save copies of all next hop weights to avoid being overwritten in loop below. */
+ for (i = 0; i < n_nhs; i++)
+ nhs[n_nhs + i].path_weight = nhs[i].path_weight;
+
+ /* Try larger and larger power of 2 sized adjacency blocks until we
+ find one where traffic flows to within 1% of specified weights. */
+ for (n_adj = max_pow2 (n_nhs); ; n_adj *= 2)
+ {
+ error = 0;
+
+ norm = n_adj / ((f64) sum_weight);
+ n_adj_left = n_adj;
+ for (i = 0; i < n_nhs; i++)
+ {
+ f64 nf = nhs[n_nhs + i].path_weight * norm; /* use saved weights */
+ word n = flt_round_nearest (nf);
+
+ n = n > n_adj_left ? n_adj_left : n;
+ n_adj_left -= n;
+ error += fabs (nf - n);
+ nhs[i].path_weight = n;
+
+ if (0 == nhs[i].path_weight)
+ {
+ /*
+ * when the weight skew is high (norm is small) and n == nf.
+ * without this correction the path with a low weight would have
+ * no represenation in the load-balanace - don't want that.
+ * If the weight skew is high so the load-balance has many buckets
+ * to allow it. pays ya money takes ya choice.
+ */
+ error = n_adj;
+ break;
+ }
+ }
+
+ nhs[0].path_weight += n_adj_left;
+
+ /* Less than 5% average error per adjacency with this size adjacency block? */
+ if (error <= multipath_next_hop_error_tolerance*n_adj)
+ {
+ /* Truncate any next hops with zero weight. */
+ _vec_len (nhs) = i;
+ break;
+ }
+ }
+
+done:
+ /* Save vector for next call. */
+ *normalized_next_hops = nhs;
+ *sum_weight_in = sum_weight;
+ return n_adj;
+}
+
+static load_balance_path_t *
+load_balance_multipath_next_hop_fixup (load_balance_path_t *nhs,
+ dpo_proto_t drop_proto)
+{
+ if (0 == vec_len(nhs))
+ {
+ load_balance_path_t *nh;
+
+ /*
+ * we need something for the load-balance. so use the drop
+ */
+ vec_add2(nhs, nh, 1);
+
+ nh->path_weight = 1;
+ dpo_copy(&nh->path_dpo, drop_dpo_get(drop_proto));
+ }
+
+ return (nhs);
+}
+
+/*
+ * Fill in adjacencies in block based on corresponding
+ * next hop adjacencies.
+ */
+static void
+load_balance_fill_buckets (load_balance_t *lb,
+ load_balance_path_t *nhs,
+ dpo_id_t *buckets,
+ u32 n_buckets)
+{
+ load_balance_path_t * nh;
+ u16 ii, bucket;
+
+ bucket = 0;
+
+ /*
+ * the next-hops have normalised weights. that means their sum is the number
+ * of buckets we need to fill.
+ */
+ vec_foreach (nh, nhs)
+ {
+ for (ii = 0; ii < nh->path_weight; ii++)
+ {
+ ASSERT(bucket < n_buckets);
+ load_balance_set_bucket_i(lb, bucket++, buckets, &nh->path_dpo);
+ }
+ }
+}
+
+static inline void
+load_balance_set_n_buckets (load_balance_t *lb,
+ u32 n_buckets)
+{
+ lb->lb_n_buckets = n_buckets;
+ lb->lb_n_buckets_minus_1 = n_buckets-1;
+}
+
+void
+load_balance_multipath_update (const dpo_id_t *dpo,
+ load_balance_path_t * raw_next_hops,
+ load_balance_flags_t flags)
+{
+ u32 sum_of_weights,n_buckets, ii;
+ load_balance_path_t * nh, * nhs;
+ index_t lbmi, old_lbmi;
+ load_balance_t *lb;
+ dpo_id_t *tmp_dpo;
+
+ nhs = NULL;
+
+ ASSERT(DPO_LOAD_BALANCE == dpo->dpoi_type);
+ lb = load_balance_get(dpo->dpoi_index);
+ raw_next_hops =
+ load_balance_multipath_next_hop_fixup(raw_next_hops,
+ lb->lb_proto);
+ n_buckets =
+ ip_multipath_normalize_next_hops(raw_next_hops,
+ &nhs,
+ &sum_of_weights,
+ multipath_next_hop_error_tolerance);
+
+ ASSERT (n_buckets >= vec_len (raw_next_hops));
+
+ /*
+ * Save the old load-balance map used, and get a new one if required.
+ */
+ old_lbmi = lb->lb_map;
+ if (flags & LOAD_BALANCE_FLAG_USES_MAP)
+ {
+ lbmi = load_balance_map_add_or_lock(n_buckets, sum_of_weights, nhs);
+ }
+ else
+ {
+ lbmi = INDEX_INVALID;
+ }
+
+ if (0 == lb->lb_n_buckets)
+ {
+ /*
+ * first time initialisation. no packets inflight, so we can write
+ * at leisure.
+ */
+ load_balance_set_n_buckets(lb, n_buckets);
+
+ if (!LB_HAS_INLINE_BUCKETS(lb))
+ vec_validate_aligned(lb->lb_buckets,
+ lb->lb_n_buckets - 1,
+ CLIB_CACHE_LINE_BYTES);
+
+ load_balance_fill_buckets(lb, nhs,
+ load_balance_get_buckets(lb),
+ n_buckets);
+ lb->lb_map = lbmi;
+ }
+ else
+ {
+ /*
+ * This is a modification of an existing load-balance.
+ * We need to ensure that packets inflight see a consistent state, that
+ * is the number of reported buckets the LB has (read from
+ * lb_n_buckets_minus_1) is not more than it actually has. So if the
+ * number of buckets is increasing, we must update the bucket array first,
+ * then the reported number. vice-versa if the number of buckets goes down.
+ */
+ if (n_buckets == lb->lb_n_buckets)
+ {
+ /*
+ * no change in the number of buckets. we can simply fill what
+ * is new over what is old.
+ */
+ load_balance_fill_buckets(lb, nhs,
+ load_balance_get_buckets(lb),
+ n_buckets);
+ lb->lb_map = lbmi;
+ }
+ else if (n_buckets > lb->lb_n_buckets)
+ {
+ /*
+ * we have more buckets. the old load-balance map (if there is one)
+ * will remain valid, i.e. mapping to indices within range, so we
+ * update it last.
+ */
+ if (n_buckets > LB_NUM_INLINE_BUCKETS &&
+ lb->lb_n_buckets <= LB_NUM_INLINE_BUCKETS)
+ {
+ /*
+ * the new increased number of buckets is crossing the threshold
+ * from the inline storage to out-line. Alloc the outline buckets
+ * first, then fixup the number. then reset the inlines.
+ */
+ ASSERT(NULL == lb->lb_buckets);
+ vec_validate_aligned(lb->lb_buckets,
+ n_buckets - 1,
+ CLIB_CACHE_LINE_BYTES);
+
+ load_balance_fill_buckets(lb, nhs,
+ lb->lb_buckets,
+ n_buckets);
+ CLIB_MEMORY_BARRIER();
+ load_balance_set_n_buckets(lb, n_buckets);
+
+ CLIB_MEMORY_BARRIER();
+
+ for (ii = 0; ii < LB_NUM_INLINE_BUCKETS; ii++)
+ {
+ dpo_reset(&lb->lb_buckets_inline[ii]);
+ }
+ }
+ else
+ {
+ if (n_buckets <= LB_NUM_INLINE_BUCKETS)
+ {
+ /*
+ * we are not crossing the threshold and it's still inline buckets.
+ * we can write the new on the old..
+ */
+ load_balance_fill_buckets(lb, nhs,
+ load_balance_get_buckets(lb),
+ n_buckets);
+ CLIB_MEMORY_BARRIER();
+ load_balance_set_n_buckets(lb, n_buckets);
+ }
+ else
+ {
+ /*
+ * we are not crossing the threshold. We need a new bucket array to
+ * hold the increased number of choices.
+ */
+ dpo_id_t *new_buckets, *old_buckets, *tmp_dpo;
+
+ new_buckets = NULL;
+ old_buckets = load_balance_get_buckets(lb);
+
+ vec_validate_aligned(new_buckets,
+ n_buckets - 1,
+ CLIB_CACHE_LINE_BYTES);
+
+ load_balance_fill_buckets(lb, nhs, new_buckets, n_buckets);
+ CLIB_MEMORY_BARRIER();
+ lb->lb_buckets = new_buckets;
+ CLIB_MEMORY_BARRIER();
+ load_balance_set_n_buckets(lb, n_buckets);
+
+ vec_foreach(tmp_dpo, old_buckets)
+ {
+ dpo_reset(tmp_dpo);
+ }
+ vec_free(old_buckets);
+ }
+ }
+
+ /*
+ * buckets fixed. ready for the MAP update.
+ */
+ lb->lb_map = lbmi;
+ }
+ else
+ {
+ /*
+ * bucket size shrinkage.
+ * Any map we have will be based on the old
+ * larger number of buckets, so will be translating to indices
+ * out of range. So the new MAP must be installed first.
+ */
+ lb->lb_map = lbmi;
+ CLIB_MEMORY_BARRIER();
+
+
+ if (n_buckets <= LB_NUM_INLINE_BUCKETS &&
+ lb->lb_n_buckets > LB_NUM_INLINE_BUCKETS)
+ {
+ /*
+ * the new decreased number of buckets is crossing the threshold
+ * from out-line storage to inline:
+ * 1 - Fill the inline buckets,
+ * 2 - fixup the number (and this point the inline buckets are
+ * used).
+ * 3 - free the outline buckets
+ */
+ load_balance_fill_buckets(lb, nhs,
+ lb->lb_buckets_inline,
+ n_buckets);
+ CLIB_MEMORY_BARRIER();
+ load_balance_set_n_buckets(lb, n_buckets);
+ CLIB_MEMORY_BARRIER();
+
+ vec_foreach(tmp_dpo, lb->lb_buckets)
+ {
+ dpo_reset(tmp_dpo);
+ }
+ vec_free(lb->lb_buckets);
+ }
+ else
+ {
+ /*
+ * not crossing the threshold.
+ * 1 - update the number to the smaller size
+ * 2 - write the new buckets
+ * 3 - reset those no longer used.
+ */
+ dpo_id_t *buckets;
+ u32 old_n_buckets;
+
+ old_n_buckets = lb->lb_n_buckets;
+ buckets = load_balance_get_buckets(lb);
+
+ load_balance_set_n_buckets(lb, n_buckets);
+ CLIB_MEMORY_BARRIER();
+
+ load_balance_fill_buckets(lb, nhs,
+ buckets,
+ n_buckets);
+
+ for (ii = old_n_buckets-n_buckets; ii < old_n_buckets; ii++)
+ {
+ dpo_reset(&buckets[ii]);
+ }
+ }
+ }
+ }
+
+ vec_foreach (nh, nhs)
+ {
+ dpo_reset(&nh->path_dpo);
+ }
+ vec_free(nhs);
+
+ load_balance_map_unlock(old_lbmi);
+}
+
+static void
+load_balance_lock (dpo_id_t *dpo)
+{
+ load_balance_t *lb;
+
+ lb = load_balance_get(dpo->dpoi_index);
+
+ lb->lb_locks++;
+}
+
+static void
+load_balance_destroy (load_balance_t *lb)
+{
+ dpo_id_t *buckets;
+ int i;
+
+ buckets = load_balance_get_buckets(lb);
+
+ for (i = 0; i < lb->lb_n_buckets; i++)
+ {
+ dpo_reset(&buckets[i]);
+ }
+
+ LB_DBG(lb, "destroy");
+ if (!LB_HAS_INLINE_BUCKETS(lb))
+ {
+ vec_free(lb->lb_buckets);
+ }
+
+ fib_urpf_list_unlock(lb->lb_urpf);
+ load_balance_map_unlock(lb->lb_map);
+
+ pool_put(load_balance_pool, lb);
+}
+
+static void
+load_balance_unlock (dpo_id_t *dpo)
+{
+ load_balance_t *lb;
+
+ lb = load_balance_get(dpo->dpoi_index);
+
+ lb->lb_locks--;
+
+ if (0 == lb->lb_locks)
+ {
+ load_balance_destroy(lb);
+ }
+}
+
+static void
+load_balance_mem_show (void)
+{
+ fib_show_memory_usage("load-balance",
+ pool_elts(load_balance_pool),
+ pool_len(load_balance_pool),
+ sizeof(load_balance_t));
+ load_balance_map_show_mem();
+}
+
+const static dpo_vft_t lb_vft = {
+ .dv_lock = load_balance_lock,
+ .dv_unlock = load_balance_unlock,
+ .dv_format = format_load_balance_dpo,
+ .dv_mem_show = load_balance_mem_show,
+};
+
+/**
+ * @brief The per-protocol VLIB graph nodes that are assigned to a load-balance
+ * object.
+ *
+ * this means that these graph nodes are ones from which a load-balance is the
+ * parent object in the DPO-graph.
+ *
+ * We do not list all the load-balance nodes, such as the *-lookup. instead
+ * we are relying on the correct use of the .sibling_of field when setting
+ * up these sibling nodes.
+ */
+const static char* const load_balance_ip4_nodes[] =
+{
+ "ip4-load-balance",
+ NULL,
+};
+const static char* const load_balance_ip6_nodes[] =
+{
+ "ip6-load-balance",
+ NULL,
+};
+const static char* const load_balance_mpls_nodes[] =
+{
+ "mpls-load-balance",
+ NULL,
+};
+const static char* const load_balance_l2_nodes[] =
+{
+ "l2-load-balance",
+ NULL,
+};
+const static char* const * const load_balance_nodes[DPO_PROTO_NUM] =
+{
+ [DPO_PROTO_IP4] = load_balance_ip4_nodes,
+ [DPO_PROTO_IP6] = load_balance_ip6_nodes,
+ [DPO_PROTO_MPLS] = load_balance_mpls_nodes,
+ [DPO_PROTO_ETHERNET] = load_balance_l2_nodes,
+};
+
+void
+load_balance_module_init (void)
+{
+ dpo_register(DPO_LOAD_BALANCE, &lb_vft, load_balance_nodes);
+
+ load_balance_map_module_init();
+}
+
+static clib_error_t *
+load_balance_show (vlib_main_t * vm,
+ unformat_input_t * input,
+ vlib_cli_command_t * cmd)
+{
+ index_t lbi = INDEX_INVALID;
+
+ while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
+ {
+ if (unformat (input, "%d", &lbi))
+ ;
+ else
+ break;
+ }
+
+ if (INDEX_INVALID != lbi)
+ {
+ vlib_cli_output (vm, "%U", format_load_balance, lbi,
+ LOAD_BALANCE_FORMAT_DETAIL);
+ }
+ else
+ {
+ load_balance_t *lb;
+
+ pool_foreach(lb, load_balance_pool,
+ ({
+ vlib_cli_output (vm, "%U", format_load_balance,
+ load_balance_get_index(lb),
+ LOAD_BALANCE_FORMAT_NONE);
+ }));
+ }
+
+ return 0;
+}
+
+VLIB_CLI_COMMAND (load_balance_show_command, static) = {
+ .path = "show load-balance",
+ .short_help = "show load-balance [<index>]",
+ .function = load_balance_show,
+};
+
+
+always_inline u32
+ip_flow_hash (void *data)
+{
+ ip4_header_t *iph = (ip4_header_t *) data;
+
+ if ((iph->ip_version_and_header_length & 0xF0) == 0x40)
+ return ip4_compute_flow_hash (iph, IP_FLOW_HASH_DEFAULT);
+ else
+ return ip6_compute_flow_hash ((ip6_header_t *) iph, IP_FLOW_HASH_DEFAULT);
+}
+
+always_inline u64
+mac_to_u64 (u8 * m)
+{
+ return (*((u64 *) m) & 0xffffffffffff);
+}
+
+always_inline u32
+l2_flow_hash (vlib_buffer_t * b0)
+{
+ ethernet_header_t *eh;
+ u64 a, b, c;
+ uword is_ip, eh_size;
+ u16 eh_type;
+
+ eh = vlib_buffer_get_current (b0);
+ eh_type = clib_net_to_host_u16 (eh->type);
+ eh_size = ethernet_buffer_header_size (b0);
+
+ is_ip = (eh_type == ETHERNET_TYPE_IP4 || eh_type == ETHERNET_TYPE_IP6);
+
+ /* since we have 2 cache lines, use them */
+ if (is_ip)
+ a = ip_flow_hash ((u8 *) vlib_buffer_get_current (b0) + eh_size);
+ else
+ a = eh->type;
+
+ b = mac_to_u64 ((u8 *) eh->dst_address);
+ c = mac_to_u64 ((u8 *) eh->src_address);
+ hash_mix64 (a, b, c);
+
+ return (u32) c;
+}
+
+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)
+{
+ u32 n_left_from, next_index, *from, *to_next;
+
+ 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 > 0 && n_left_to_next > 0)
+ {
+ vlib_buffer_t *b0;
+ u32 bi0, lbi0, next0;
+ const dpo_id_t *dpo0;
+ const load_balance_t *lb0;
+
+ 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);
+
+ /* lookup dst + src mac */
+ lbi0 = vnet_buffer (b0)->ip.adj_index[VLIB_TX];
+ lb0 = load_balance_get(lbi0);
+
+ vnet_buffer(b0)->ip.flow_hash = l2_flow_hash(b0);
+
+ dpo0 = load_balance_get_bucket_i(lb0,
+ vnet_buffer(b0)->ip.flow_hash &
+ (lb0->lb_n_buckets_minus_1));
+
+ next0 = dpo0->dpoi_next_node;
+ vnet_buffer (b0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
+
+ if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ load_balance_trace_t *tr = vlib_add_trace (vm, node, b0,
+ sizeof (*tr));
+ tr->lb_index = lbi0;
+ }
+ 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;
+}
+
+static u8 *
+format_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, "L2-load-balance: index %d", t->lb_index);
+ return s;
+}
+
+/**
+ * @brief
+ */
+VLIB_REGISTER_NODE (l2_load_balance_node) = {
+ .function = l2_load_balance,
+ .name = "l2-load-balance",
+ .vector_size = sizeof (u32),
+
+ .format_trace = format_load_balance_trace,
+ .n_next_nodes = 1,
+ .next_nodes = {
+ [0] = "error-drop",
+ },
+};
diff --git a/src/vnet/dpo/load_balance.h b/src/vnet/dpo/load_balance.h
new file mode 100644
index 00000000000..dc6485e688a
--- /dev/null
+++ b/src/vnet/dpo/load_balance.h
@@ -0,0 +1,211 @@
+/*
+ * 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.
+ */
+/**
+ * \brief
+ * The load-balance object represents an ECMP choice. The buckets of a load
+ * balance object point to the sub-graph after the choice is made.
+ * THe load-balance object is also object type returned from a FIB table lookup.
+ * As such it needs to represent the case where there is only one coice. It may
+ * seem like overkill to use a load-balance object in this case, but the reason
+ * is for performance. If the load-balance object were not the result of the FIB
+ * lookup, then some other object would be. The case where there was ECMP
+ * this other object would need a load-balance as a parent and hence just add
+ * an unnecessary indirection.
+ *
+ * It is also the object in the DP that represents a via-fib-entry in a recursive
+ * route.
+ *
+ */
+
+#ifndef __LOAD_BALANCE_H__
+#define __LOAD_BALANCE_H__
+
+#include <vlib/vlib.h>
+#include <vnet/ip/lookup.h>
+#include <vnet/dpo/dpo.h>
+#include <vnet/fib/fib_types.h>
+
+/**
+ * Load-balance main
+ */
+typedef struct load_balance_main_t_
+{
+ vlib_combined_counter_main_t lbm_to_counters;
+ vlib_combined_counter_main_t lbm_via_counters;
+} load_balance_main_t;
+
+extern load_balance_main_t load_balance_main;
+
+/**
+ * The number of buckets that a load-balance object can have and still
+ * fit in one cache-line
+ */
+#define LB_NUM_INLINE_BUCKETS 4
+
+/**
+ * @brief One path from an [EU]CMP set that the client wants to add to a
+ * load-balance object
+ */
+typedef struct load_balance_path_t_ {
+ /**
+ * ID of the Data-path object.
+ */
+ dpo_id_t path_dpo;
+
+ /**
+ * The index of the FIB path
+ */
+ fib_node_index_t path_index;
+
+ /**
+ * weight for the path.
+ */
+ u32 path_weight;
+} load_balance_path_t;
+
+/**
+ * The FIB DPO provieds;
+ * - load-balancing over the next DPOs in the chain/graph
+ * - per-route counters
+ */
+typedef struct load_balance_t_ {
+ /**
+ * number of buckets in the load-balance. always a power of 2.
+ */
+ u16 lb_n_buckets;
+ /**
+ * number of buckets in the load-balance - 1. used in the switch path
+ * as part of the hash calculation.
+ */
+ u16 lb_n_buckets_minus_1;
+
+ /**
+ * The protocol of packets that traverse this LB.
+ * need in combination with the flow hash config to determine how to hash.
+ * u8.
+ */
+ dpo_proto_t lb_proto;
+
+ /**
+ * The number of locks, which is approximately the number of users,
+ * of this load-balance.
+ * Load-balance objects of via-entries are heavily shared by recursives,
+ * so the lock count is a u32.
+ */
+ u32 lb_locks;
+
+ /**
+ * index of the load-balance map, INVALID if this LB does not use one
+ */
+ index_t lb_map;
+
+ /**
+ * This is the index of the uRPF list for this LB
+ */
+ index_t lb_urpf;
+
+ /**
+ * the hash config to use when selecting a bucket. this is a u16
+ */
+ flow_hash_config_t lb_hash_config;
+
+ /**
+ * Vector of buckets containing the next DPOs, sized as lbo_num
+ */
+ dpo_id_t *lb_buckets;
+
+ /**
+ * The rest of the cache line is used for buckets. In the common case
+ * where there there are less than 4 buckets, then the buckets are
+ * on the same cachlie and we save ourselves a pointer dereferance in
+ * the data-path.
+ */
+ dpo_id_t lb_buckets_inline[LB_NUM_INLINE_BUCKETS];
+} load_balance_t;
+
+STATIC_ASSERT(sizeof(load_balance_t) <= CLIB_CACHE_LINE_BYTES,
+ "A load_balance object size exceeds one cachline");
+
+/**
+ * Flags controlling load-balance formatting/display
+ */
+typedef enum load_balance_format_flags_t_ {
+ LOAD_BALANCE_FORMAT_NONE,
+ LOAD_BALANCE_FORMAT_DETAIL = (1 << 0),
+} load_balance_format_flags_t;
+
+/**
+ * Flags controlling load-balance creation and modification
+ */
+typedef enum load_balance_flags_t_ {
+ LOAD_BALANCE_FLAG_NONE = 0,
+ LOAD_BALANCE_FLAG_USES_MAP = (1 << 0),
+} load_balance_flags_t;
+
+extern index_t load_balance_create(u32 num_buckets,
+ dpo_proto_t lb_proto,
+ flow_hash_config_t fhc);
+extern void load_balance_multipath_update(
+ const dpo_id_t *dpo,
+ load_balance_path_t * raw_next_hops,
+ load_balance_flags_t flags);
+
+extern void load_balance_set_bucket(index_t lbi,
+ u32 bucket,
+ const dpo_id_t *next);
+extern void load_balance_set_urpf(index_t lbi,
+ index_t urpf);
+extern index_t load_balance_get_urpf(index_t lbi);
+
+extern u8* format_load_balance(u8 * s, va_list * args);
+
+extern const dpo_id_t *load_balance_get_bucket(index_t lbi,
+ u32 bucket);
+extern int load_balance_is_drop(const dpo_id_t *dpo);
+
+extern f64 load_balance_get_multipath_tolerance(void);
+
+/**
+ * The encapsulation breakages are for fast DP access
+ */
+extern load_balance_t *load_balance_pool;
+static inline load_balance_t*
+load_balance_get (index_t lbi)
+{
+ return (pool_elt_at_index(load_balance_pool, lbi));
+}
+
+#define LB_HAS_INLINE_BUCKETS(_lb) \
+ ((_lb)->lb_n_buckets <= LB_NUM_INLINE_BUCKETS)
+
+static inline const dpo_id_t *
+load_balance_get_bucket_i (const load_balance_t *lb,
+ u32 bucket)
+{
+ ASSERT(bucket < lb->lb_n_buckets);
+
+ if (PREDICT_TRUE(LB_HAS_INLINE_BUCKETS(lb)))
+ {
+ return (&lb->lb_buckets_inline[bucket]);
+ }
+ else
+ {
+ return (&lb->lb_buckets[bucket]);
+ }
+}
+
+extern void load_balance_module_init(void);
+
+#endif
diff --git a/src/vnet/dpo/load_balance_map.c b/src/vnet/dpo/load_balance_map.c
new file mode 100644
index 00000000000..70ce1bf7c39
--- /dev/null
+++ b/src/vnet/dpo/load_balance_map.c
@@ -0,0 +1,575 @@
+/*
+ * 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.
+ */
+/**
+ * @brief
+ */
+#include <vnet/fib/fib_path.h>
+#include <vnet/fib/fib_node_list.h>
+#include <vnet/dpo/load_balance_map.h>
+#include <vnet/dpo/load_balance.h>
+
+/**
+ * A hash-table of load-balance maps by path index.
+ * this provides the fast lookup of the LB map when a path goes down
+ */
+static uword *lb_maps_by_path_index;
+
+/**
+ * A hash-table of load-balance maps by set of paths.
+ * This provides the LB map sharing.
+ * LB maps do not necessarily use all the paths in the list, since
+ * the entry that is requesting the map, may not have an out-going
+ * label for each of the paths.
+ */
+static uword *load_balance_map_db;
+
+typedef enum load_balance_map_path_flags_t_
+{
+ LOAD_BALANCE_MAP_PATH_UP = (1 << 0),
+ LOAD_BALANCE_MAP_PATH_USABLE = (1 << 1),
+} __attribute__ ((packed)) load_balance_map_path_flags_t;
+
+typedef struct load_balance_map_path_t_ {
+ /**
+ * Index of the path
+ */
+ fib_node_index_t lbmp_index;
+
+ /**
+ * Sibling Index in the list of all maps with this path index
+ */
+ fib_node_index_t lbmp_sibling;
+
+ /**
+ * the normalised wegiht of the path
+ */
+ u32 lbmp_weight;
+
+ /**
+ * The sate of the path
+ */
+ load_balance_map_path_flags_t lbmp_flags;
+} load_balance_map_path_t;
+
+/**
+ * The global pool of LB maps
+ */
+load_balance_map_t *load_balance_map_pool;
+
+/*
+ * Debug macro
+ */
+#ifdef FIB_DEBUG
+#define LOAD_BALANCE_MAP_DBG(_pl, _fmt, _args...) \
+ { \
+ clib_warning("lbm: FIXME" _fmt, \
+ ##_args); \
+ }
+#else
+#define LOAD_BALANCE_MAP_DBG(_pl, _fmt, _args...)
+#endif
+
+static index_t
+load_balance_map_get_index (load_balance_map_t *lbm)
+{
+ return (lbm - load_balance_map_pool);
+}
+
+u8*
+format_load_balance_map (u8 *s, va_list ap)
+{
+ index_t lbmi = va_arg(ap, index_t);
+ u32 indent = va_arg(ap, u32);
+ load_balance_map_t *lbm;
+ u32 n_buckets, ii;
+
+ lbm = load_balance_map_get(lbmi);
+ n_buckets = vec_len(lbm->lbm_buckets);
+
+ s = format(s, "load-balance-map: index:%d buckets:%d", lbmi, n_buckets);
+ s = format(s, "\n%U index:", format_white_space, indent+2);
+ for (ii = 0; ii < n_buckets; ii++)
+ {
+ s = format(s, "%5d", ii);
+ }
+ s = format(s, "\n%U map:", format_white_space, indent+2);
+ for (ii = 0; ii < n_buckets; ii++)
+ {
+ s = format(s, "%5d", lbm->lbm_buckets[ii]);
+ }
+
+ return (s);
+}
+
+
+static uword
+load_balance_map_hash (load_balance_map_t *lbm)
+{
+ u32 old_lbm_hash, new_lbm_hash, hash;
+ load_balance_map_path_t *lb_path;
+
+ new_lbm_hash = old_lbm_hash = vec_len(lbm->lbm_paths);
+
+ vec_foreach (lb_path, lbm->lbm_paths)
+ {
+ hash = lb_path->lbmp_index;
+ hash_mix32(hash, old_lbm_hash, new_lbm_hash);
+ }
+
+ return (new_lbm_hash);
+}
+
+always_inline uword
+load_balance_map_db_hash_key_from_index (uword index)
+{
+ return 1 + 2*index;
+}
+
+always_inline uword
+load_balance_map_db_hash_key_is_index (uword key)
+{
+ return key & 1;
+}
+
+always_inline uword
+load_balance_map_db_hash_key_2_index (uword key)
+{
+ ASSERT (load_balance_map_db_hash_key_is_index (key));
+ return key / 2;
+}
+
+static load_balance_map_t*
+load_balance_map_db_get_from_hash_key (uword key)
+{
+ load_balance_map_t *lbm;
+
+ if (load_balance_map_db_hash_key_is_index (key))
+ {
+ index_t lbm_index;
+
+ lbm_index = load_balance_map_db_hash_key_2_index(key);
+ lbm = load_balance_map_get(lbm_index);
+ }
+ else
+ {
+ lbm = uword_to_pointer (key, load_balance_map_t *);
+ }
+
+ return (lbm);
+}
+
+static uword
+load_balance_map_db_hash_key_sum (hash_t * h,
+ uword key)
+{
+ load_balance_map_t *lbm;
+
+ lbm = load_balance_map_db_get_from_hash_key(key);
+
+ return (load_balance_map_hash(lbm));
+}
+
+static uword
+load_balance_map_db_hash_key_equal (hash_t * h,
+ uword key1,
+ uword key2)
+{
+ load_balance_map_t *lbm1, *lbm2;
+
+ lbm1 = load_balance_map_db_get_from_hash_key(key1);
+ lbm2 = load_balance_map_db_get_from_hash_key(key2);
+
+ return (load_balance_map_hash(lbm1) ==
+ load_balance_map_hash(lbm2));
+}
+
+static index_t
+load_balance_map_db_find (load_balance_map_t *lbm)
+{
+ uword *p;
+
+ p = hash_get(load_balance_map_db, lbm);
+
+ if (NULL != p)
+ {
+ return p[0];
+ }
+
+ return (FIB_NODE_INDEX_INVALID);
+}
+
+static void
+load_balance_map_db_insert (load_balance_map_t *lbm)
+{
+ load_balance_map_path_t *lbmp;
+ fib_node_list_t list;
+ uword *p;
+
+ ASSERT(FIB_NODE_INDEX_INVALID == load_balance_map_db_find(lbm));
+
+ /*
+ * insert into the DB based on the set of paths.
+ */
+ hash_set (load_balance_map_db,
+ load_balance_map_db_hash_key_from_index(
+ load_balance_map_get_index(lbm)),
+ load_balance_map_get_index(lbm));
+
+ /*
+ * insert into each per-path list.
+ */
+ vec_foreach(lbmp, lbm->lbm_paths)
+ {
+ p = hash_get(lb_maps_by_path_index, lbmp->lbmp_index);
+
+ if (NULL == p)
+ {
+ list = fib_node_list_create();
+ hash_set(lb_maps_by_path_index, lbmp->lbmp_index, list);
+ }
+ else
+ {
+ list = p[0];
+ }
+
+ lbmp->lbmp_sibling =
+ fib_node_list_push_front(list,
+ 0, FIB_NODE_TYPE_FIRST,
+ load_balance_map_get_index(lbm));
+ }
+
+ LOAD_BALANCE_MAP_DBG(lbm, "DB-inserted");
+}
+
+static void
+load_balance_map_db_remove (load_balance_map_t *lbm)
+{
+ load_balance_map_path_t *lbmp;
+ uword *p;
+
+ ASSERT(FIB_NODE_INDEX_INVALID != load_balance_map_db_find(lbm));
+
+ hash_unset(load_balance_map_db,
+ load_balance_map_db_hash_key_from_index(
+ load_balance_map_get_index(lbm)));
+
+ /*
+ * remove from each per-path list.
+ */
+ vec_foreach(lbmp, lbm->lbm_paths)
+ {
+ p = hash_get(lb_maps_by_path_index, lbmp->lbmp_index);
+
+ ASSERT(NULL != p);
+
+ fib_node_list_remove(p[0], lbmp->lbmp_sibling);
+ }
+
+ LOAD_BALANCE_MAP_DBG(lbm, "DB-removed");
+}
+
+/**
+ * @brief from the paths that are usable, fill the Map.
+ */
+static void
+load_balance_map_fill (load_balance_map_t *lbm)
+{
+ load_balance_map_path_t *lbmp;
+ u32 n_buckets, bucket, ii, jj;
+ u16 *tmp_buckets;
+
+ tmp_buckets = NULL;
+ n_buckets = vec_len(lbm->lbm_buckets);
+
+ /*
+ * run throught the set of paths once, and build a vector of the
+ * indices that are usable. we do this is a scratch space, since we
+ * need to refer to it multiple times as we build the real buckets.
+ */
+ vec_validate(tmp_buckets, n_buckets-1);
+
+ bucket = jj = 0;
+ vec_foreach (lbmp, lbm->lbm_paths)
+ {
+ if (fib_path_is_resolved(lbmp->lbmp_index))
+ {
+ for (ii = 0; ii < lbmp->lbmp_weight; ii++)
+ {
+ tmp_buckets[jj++] = bucket++;
+ }
+ }
+ else
+ {
+ bucket += lbmp->lbmp_weight;
+ }
+ }
+ _vec_len(tmp_buckets) = jj;
+
+ /*
+ * If the number of temporaries written is as many as we need, implying
+ * all paths were up, then we can simply copy the scratch area over the
+ * actual buckets' memory
+ */
+ if (jj == n_buckets)
+ {
+ memcpy(lbm->lbm_buckets,
+ tmp_buckets,
+ sizeof(lbm->lbm_buckets[0]) * n_buckets);
+ }
+ else
+ {
+ /*
+ * one or more paths are down.
+ */
+ if (0 == vec_len(tmp_buckets))
+ {
+ /*
+ * if the scratch area is empty, then no paths are usable.
+ * they will all drop. so use them all, lest we account drops
+ * against only one.
+ */
+ for (bucket = 0; bucket < n_buckets; bucket++)
+ {
+ lbm->lbm_buckets[bucket] = bucket;
+ }
+ }
+ else
+ {
+ bucket = jj = 0;
+ vec_foreach (lbmp, lbm->lbm_paths)
+ {
+ if (fib_path_is_resolved(lbmp->lbmp_index))
+ {
+ for (ii = 0; ii < lbmp->lbmp_weight; ii++)
+ {
+ lbm->lbm_buckets[bucket] = bucket;
+ bucket++;
+ }
+ }
+ else
+ {
+ /*
+ * path is unusable
+ * cycle through the scratch space selecting a index.
+ * this means we load balance, in the intended ratio,
+ * over the paths that are still usable.
+ */
+ for (ii = 0; ii < lbmp->lbmp_weight; ii++)
+ {
+ lbm->lbm_buckets[bucket] = tmp_buckets[jj];
+ jj = (jj + 1) % vec_len(tmp_buckets);
+ bucket++;
+ }
+ }
+ }
+ }
+ }
+
+ vec_free(tmp_buckets);
+}
+
+static load_balance_map_t*
+load_balance_map_alloc (const load_balance_path_t *paths)
+{
+ load_balance_map_t *lbm;
+ u32 ii;
+
+ pool_get_aligned(load_balance_map_pool, lbm, CLIB_CACHE_LINE_BYTES);
+ memset(lbm, 0, sizeof(*lbm));
+
+ vec_validate(lbm->lbm_paths, vec_len(paths)-1);
+
+ vec_foreach_index(ii, paths)
+ {
+ lbm->lbm_paths[ii].lbmp_index = paths[ii].path_index;
+ lbm->lbm_paths[ii].lbmp_weight = paths[ii].path_weight;
+ }
+
+ return (lbm);
+}
+
+static load_balance_map_t *
+load_balance_map_init (load_balance_map_t *lbm,
+ u32 n_buckets,
+ u32 sum_of_weights)
+{
+ lbm->lbm_sum_of_norm_weights = sum_of_weights;
+ vec_validate(lbm->lbm_buckets, n_buckets-1);
+
+ load_balance_map_db_insert(lbm);
+
+ load_balance_map_fill(lbm);
+
+ return (lbm);
+}
+
+index_t
+load_balance_map_add_or_lock (u32 n_buckets,
+ u32 sum_of_weights,
+ const load_balance_path_t *paths)
+{
+ load_balance_map_t *tmp, *lbm;
+ index_t lbmi;
+
+ tmp = load_balance_map_alloc(paths);
+
+ lbmi = load_balance_map_db_find(tmp);
+
+ if (INDEX_INVALID == lbmi)
+ {
+ lbm = load_balance_map_init(tmp, n_buckets, sum_of_weights);
+ }
+ else
+ {
+ lbm = load_balance_map_get(lbmi);
+ }
+
+ lbm->lbm_locks++;
+
+ return (load_balance_map_get_index(lbm));
+}
+
+void
+load_balance_map_lock (index_t lbmi)
+{
+ load_balance_map_t *lbm;
+
+ lbm = load_balance_map_get(lbmi);
+
+ lbm->lbm_locks++;
+}
+
+void
+load_balance_map_unlock (index_t lbmi)
+{
+ load_balance_map_t *lbm;
+
+ if (INDEX_INVALID == lbmi)
+ {
+ return;
+ }
+
+ lbm = load_balance_map_get(lbmi);
+
+ lbm->lbm_locks--;
+
+ if (0 == lbm->lbm_locks)
+ {
+ load_balance_map_db_remove(lbm);
+ vec_free(lbm->lbm_paths);
+ vec_free(lbm->lbm_buckets);
+ pool_put(load_balance_map_pool, lbm);
+ }
+}
+
+static int
+load_balance_map_path_state_change_walk (fib_node_ptr_t *fptr,
+ void *ctx)
+{
+ load_balance_map_t *lbm;
+
+ lbm = load_balance_map_get(fptr->fnp_index);
+
+ load_balance_map_fill(lbm);
+
+ return (!0);
+}
+
+/**
+ * @brief the state of a path has changed (it has no doubt gone down).
+ * This is the trigger to perform a PIC edge cutover and update the maps
+ * to exclude this path.
+ */
+void
+load_balance_map_path_state_change (fib_node_index_t path_index)
+{
+ uword *p;
+
+ /*
+ * re-stripe the buckets for each affect MAP
+ */
+ p = hash_get(lb_maps_by_path_index, path_index);
+
+ if (NULL == p)
+ return;
+
+ fib_node_list_walk(p[0], load_balance_map_path_state_change_walk, NULL);
+}
+
+/**
+ * @brief Make/add a new or lock an existing Load-balance map
+ */
+void
+load_balance_map_module_init (void)
+{
+ load_balance_map_db =
+ hash_create2 (/* elts */ 0,
+ /* user */ 0,
+ /* value_bytes */ sizeof (index_t),
+ load_balance_map_db_hash_key_sum,
+ load_balance_map_db_hash_key_equal,
+ /* format pair/arg */
+ 0, 0);
+
+ lb_maps_by_path_index = hash_create(0, sizeof(fib_node_list_t));
+}
+
+void
+load_balance_map_show_mem (void)
+{
+ fib_show_memory_usage("Load-Balance Map",
+ pool_elts(load_balance_map_pool),
+ pool_len(load_balance_map_pool),
+ sizeof(load_balance_map_t));
+}
+
+static clib_error_t *
+load_balance_map_show (vlib_main_t * vm,
+ unformat_input_t * input,
+ vlib_cli_command_t * cmd)
+{
+ index_t lbmi = INDEX_INVALID;
+
+ while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
+ {
+ if (unformat (input, "%d", &lbmi))
+ ;
+ else
+ break;
+ }
+
+ if (INDEX_INVALID != lbmi)
+ {
+ vlib_cli_output (vm, "%U", format_load_balance_map, lbmi, 0);
+ }
+ else
+ {
+ load_balance_map_t *lbm;
+
+ pool_foreach(lbm, load_balance_map_pool,
+ ({
+ vlib_cli_output (vm, "%U", format_load_balance_map,
+ load_balance_map_get_index(lbm), 0);
+ }));
+ }
+
+ return 0;
+}
+
+VLIB_CLI_COMMAND (load_balance_map_show_command, static) = {
+ .path = "show load-balance-map",
+ .short_help = "show load-balance-map [<index>]",
+ .function = load_balance_map_show,
+};
diff --git a/src/vnet/dpo/load_balance_map.h b/src/vnet/dpo/load_balance_map.h
new file mode 100644
index 00000000000..454bf4b3763
--- /dev/null
+++ b/src/vnet/dpo/load_balance_map.h
@@ -0,0 +1,79 @@
+/*
+ * 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.
+ */
+/**
+ * @brief
+ */
+
+#ifndef __LOAD_BALANCE_MAP_H__
+#define __LOAD_BALANCE_MAP_H__
+
+#include <vlib/vlib.h>
+#include <vnet/fib/fib_types.h>
+#include <vnet/dpo/load_balance.h>
+
+struct load_balance_map_path_t_;
+
+/**
+ */
+typedef struct load_balance_map_t_ {
+ /**
+ * The buckets of the map that provide the index to index translation.
+ * In the first cacheline.
+ */
+ u16 *lbm_buckets;
+
+ /**
+ * the vector of paths this MAP represents
+ */
+ struct load_balance_map_path_t_ *lbm_paths;
+
+ /**
+ * the sum of the normalised weights. cache for convenience
+ */
+ u32 lbm_sum_of_norm_weights;
+
+ /**
+ * Number of locks. Maps are shared by a large number of recrusvie fib_entry_ts
+ */
+ u32 lbm_locks;
+} load_balance_map_t;
+
+extern index_t load_balance_map_add_or_lock(u32 n_buckets,
+ u32 sum_of_weights,
+ const load_balance_path_t *norm_paths);
+
+extern void load_balance_map_lock(index_t lmbi);
+extern void load_balance_map_unlock(index_t lbmi);
+
+extern void load_balance_map_path_state_change(fib_node_index_t path_index);
+
+extern u8* format_load_balance_map(u8 *s, va_list ap);
+extern void load_balance_map_show_mem(void);
+
+/**
+ * The encapsulation breakages are for fast DP access
+ */
+extern load_balance_map_t *load_balance_map_pool;
+
+static inline load_balance_map_t*
+load_balance_map_get (index_t lbmi)
+{
+ return (pool_elt_at_index(load_balance_map_pool, lbmi));
+}
+
+
+extern void load_balance_map_module_init(void);
+
+#endif
diff --git a/src/vnet/dpo/lookup_dpo.c b/src/vnet/dpo/lookup_dpo.c
new file mode 100644
index 00000000000..96fedd27ce9
--- /dev/null
+++ b/src/vnet/dpo/lookup_dpo.c
@@ -0,0 +1,1185 @@
+/*
+ * 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 <vnet/ip/ip.h>
+#include <vnet/dpo/lookup_dpo.h>
+#include <vnet/dpo/load_balance.h>
+#include <vnet/mpls/mpls.h>
+#include <vnet/fib/fib_table.h>
+#include <vnet/fib/ip4_fib.h>
+#include <vnet/fib/ip6_fib.h>
+#include <vnet/fib/mpls_fib.h>
+
+static const char *const lookup_input_names[] = LOOKUP_INPUTS;
+
+/**
+ * @brief Enumeration of the lookup subtypes
+ */
+typedef enum lookup_sub_type_t_
+{
+ LOOKUP_SUB_TYPE_SRC,
+ LOOKUP_SUB_TYPE_DST,
+ LOOKUP_SUB_TYPE_DST_TABLE_FROM_INTERFACE,
+} lookup_sub_type_t;
+#define LOOKUP_SUB_TYPE_NUM (LOOKUP_SUB_TYPE_DST_TABLE_FROM_INTERFACE+1)
+
+#define FOR_EACH_LOOKUP_SUB_TYPE(_st) \
+ for (_st = LOOKUP_SUB_TYPE_IP4_SRC; _st < LOOKUP_SUB_TYPE_NUM; _st++)
+
+/**
+ * @brief pool of all MPLS Label DPOs
+ */
+lookup_dpo_t *lookup_dpo_pool;
+
+/**
+ * @brief An array of registered DPO type values for the sub-types
+ */
+static dpo_type_t lookup_dpo_sub_types[LOOKUP_SUB_TYPE_NUM];
+
+static lookup_dpo_t *
+lookup_dpo_alloc (void)
+{
+ lookup_dpo_t *lkd;
+
+ pool_get_aligned(lookup_dpo_pool, lkd, CLIB_CACHE_LINE_BYTES);
+
+ return (lkd);
+}
+
+static index_t
+lookup_dpo_get_index (lookup_dpo_t *lkd)
+{
+ return (lkd - lookup_dpo_pool);
+}
+
+static void
+lookup_dpo_add_or_lock_i (fib_node_index_t fib_index,
+ dpo_proto_t proto,
+ lookup_input_t input,
+ lookup_table_t table_config,
+ dpo_id_t *dpo)
+{
+ lookup_dpo_t *lkd;
+ dpo_type_t type;
+
+ lkd = lookup_dpo_alloc();
+ lkd->lkd_fib_index = fib_index;
+ lkd->lkd_proto = proto;
+ lkd->lkd_input = input;
+ lkd->lkd_table = table_config;
+
+ /*
+ * use the input type to select the lookup sub-type
+ */
+ type = 0;
+
+ switch (input)
+ {
+ case LOOKUP_INPUT_SRC_ADDR:
+ type = lookup_dpo_sub_types[LOOKUP_SUB_TYPE_SRC];
+ break;
+ case LOOKUP_INPUT_DST_ADDR:
+ switch (table_config)
+ {
+ case LOOKUP_TABLE_FROM_INPUT_INTERFACE:
+ type = lookup_dpo_sub_types[LOOKUP_SUB_TYPE_DST_TABLE_FROM_INTERFACE];
+ break;
+ case LOOKUP_TABLE_FROM_CONFIG:
+ type = lookup_dpo_sub_types[LOOKUP_SUB_TYPE_DST];
+ break;
+ }
+ }
+
+ if (0 == type)
+ {
+ dpo_reset(dpo);
+ }
+ else
+ {
+ dpo_set(dpo, type, proto, lookup_dpo_get_index(lkd));
+ }
+}
+
+void
+lookup_dpo_add_or_lock_w_fib_index (fib_node_index_t fib_index,
+ dpo_proto_t proto,
+ lookup_input_t input,
+ lookup_table_t table_config,
+ dpo_id_t *dpo)
+{
+ if (LOOKUP_TABLE_FROM_CONFIG == table_config)
+ {
+ fib_table_lock(fib_index, dpo_proto_to_fib(proto));
+ }
+ lookup_dpo_add_or_lock_i(fib_index, proto, input, table_config, dpo);
+}
+
+void
+lookup_dpo_add_or_lock_w_table_id (u32 table_id,
+ dpo_proto_t proto,
+ lookup_input_t input,
+ lookup_table_t table_config,
+ dpo_id_t *dpo)
+{
+ fib_node_index_t fib_index = FIB_NODE_INDEX_INVALID;
+
+ if (LOOKUP_TABLE_FROM_CONFIG == table_config)
+ {
+ fib_index =
+ fib_table_find_or_create_and_lock(dpo_proto_to_fib(proto),
+ table_id);
+ }
+
+ ASSERT(FIB_NODE_INDEX_INVALID != fib_index);
+ lookup_dpo_add_or_lock_i(fib_index, proto, input, table_config, dpo);
+}
+
+u8*
+format_lookup_dpo (u8 *s, va_list *args)
+{
+ index_t index = va_arg (*args, index_t);
+ lookup_dpo_t *lkd;
+
+ lkd = lookup_dpo_get(index);
+
+ if (LOOKUP_TABLE_FROM_INPUT_INTERFACE == lkd->lkd_table)
+ {
+ s = format(s, "%s lookup in interface's %U table",
+ lookup_input_names[lkd->lkd_input],
+ format_dpo_proto, lkd->lkd_proto);
+ }
+ else
+ {
+ s = format(s, "%s lookup in %U",
+ lookup_input_names[lkd->lkd_input],
+ format_fib_table_name, lkd->lkd_fib_index,
+ dpo_proto_to_fib(lkd->lkd_proto));
+ }
+ return (s);
+}
+
+static void
+lookup_dpo_lock (dpo_id_t *dpo)
+{
+ lookup_dpo_t *lkd;
+
+ lkd = lookup_dpo_get(dpo->dpoi_index);
+
+ lkd->lkd_locks++;
+}
+
+static void
+lookup_dpo_unlock (dpo_id_t *dpo)
+{
+ lookup_dpo_t *lkd;
+
+ lkd = lookup_dpo_get(dpo->dpoi_index);
+
+ lkd->lkd_locks--;
+
+ if (0 == lkd->lkd_locks)
+ {
+ if (LOOKUP_TABLE_FROM_CONFIG == lkd->lkd_table)
+ {
+ fib_table_unlock(lkd->lkd_fib_index,
+ dpo_proto_to_fib(lkd->lkd_proto));
+ }
+ pool_put(lookup_dpo_pool, lkd);
+ }
+}
+
+always_inline void
+ip4_src_fib_lookup_one (u32 src_fib_index0,
+ const ip4_address_t * addr0,
+ u32 * src_adj_index0)
+{
+ ip4_fib_mtrie_leaf_t leaf0, leaf1;
+ ip4_fib_mtrie_t * mtrie0;
+
+ mtrie0 = &ip4_fib_get (src_fib_index0)->mtrie;
+
+ leaf0 = leaf1 = IP4_FIB_MTRIE_LEAF_ROOT;
+ leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, addr0, 0);
+ leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, addr0, 1);
+ leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, addr0, 2);
+ leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, addr0, 3);
+
+ /* Handle default route. */
+ leaf0 = (leaf0 == IP4_FIB_MTRIE_LEAF_EMPTY ? mtrie0->default_leaf : leaf0);
+ src_adj_index0[0] = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
+}
+
+always_inline void
+ip4_src_fib_lookup_two (u32 src_fib_index0,
+ u32 src_fib_index1,
+ const ip4_address_t * addr0,
+ const ip4_address_t * addr1,
+ u32 * src_adj_index0,
+ u32 * src_adj_index1)
+{
+ ip4_fib_mtrie_leaf_t leaf0, leaf1;
+ ip4_fib_mtrie_t * mtrie0, * mtrie1;
+
+ mtrie0 = &ip4_fib_get (src_fib_index0)->mtrie;
+ mtrie1 = &ip4_fib_get (src_fib_index1)->mtrie;
+
+ leaf0 = leaf1 = IP4_FIB_MTRIE_LEAF_ROOT;
+
+ leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, addr0, 0);
+ leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1, addr1, 0);
+
+ leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, addr0, 1);
+ leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1, addr1, 1);
+
+ leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, addr0, 2);
+ leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1, addr1, 2);
+
+ leaf0 = ip4_fib_mtrie_lookup_step (mtrie0, leaf0, addr0, 3);
+ leaf1 = ip4_fib_mtrie_lookup_step (mtrie1, leaf1, addr1, 3);
+
+ /* Handle default route. */
+ leaf0 = (leaf0 == IP4_FIB_MTRIE_LEAF_EMPTY ? mtrie0->default_leaf : leaf0);
+ leaf1 = (leaf1 == IP4_FIB_MTRIE_LEAF_EMPTY ? mtrie1->default_leaf : leaf1);
+ src_adj_index0[0] = ip4_fib_mtrie_leaf_get_adj_index (leaf0);
+ src_adj_index1[0] = ip4_fib_mtrie_leaf_get_adj_index (leaf1);
+}
+
+/**
+ * @brief Lookup trace data
+ */
+typedef struct lookup_trace_t_
+{
+ union {
+ ip46_address_t addr;
+ mpls_unicast_header_t hdr;
+ };
+ fib_node_index_t fib_index;
+ index_t lbi;
+} lookup_trace_t;
+
+
+always_inline uword
+lookup_dpo_ip4_inline (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame,
+ int input_src_addr,
+ int table_from_interface)
+{
+ u32 n_left_from, next_index, * from, * to_next;
+ u32 cpu_index = os_get_cpu_number();
+ vlib_combined_counter_main_t * cm = &load_balance_main.lbm_to_counters;
+
+ from = vlib_frame_vector_args (from_frame);
+ n_left_from = 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, lkdi0, lbi0, fib_index0, next0, hash_c0;
+ flow_hash_config_t flow_hash_config0;
+ const ip4_address_t *input_addr0;
+ const load_balance_t *lb0;
+ const lookup_dpo_t * lkd0;
+ const ip4_header_t * ip0;
+ const dpo_id_t *dpo0;
+ vlib_buffer_t * b0;
+ u32 bi1, lkdi1, lbi1, fib_index1, next1, hash_c1;
+ flow_hash_config_t flow_hash_config1;
+ const ip4_address_t *input_addr1;
+ const load_balance_t *lb1;
+ const lookup_dpo_t * lkd1;
+ const ip4_header_t * ip1;
+ const dpo_id_t *dpo1;
+ vlib_buffer_t * b1;
+
+ /* Prefetch next iteration. */
+ {
+ vlib_buffer_t * p2, * p3;
+
+ p2 = vlib_get_buffer (vm, from[2]);
+ p3 = vlib_get_buffer (vm, from[3]);
+
+ vlib_prefetch_buffer_header (p2, LOAD);
+ vlib_prefetch_buffer_header (p3, LOAD);
+
+ CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE);
+ CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE);
+ }
+
+ bi0 = from[0];
+ to_next[0] = bi0;
+ bi1 = from[1];
+ to_next[1] = bi1;
+ from += 2;
+ to_next += 2;
+ n_left_from -= 2;
+ n_left_to_next -= 2;
+
+ b0 = vlib_get_buffer (vm, bi0);
+ ip0 = vlib_buffer_get_current (b0);
+ b1 = vlib_get_buffer (vm, bi1);
+ ip1 = vlib_buffer_get_current (b1);
+
+ /* dst lookup was done by ip4 lookup */
+ lkdi0 = vnet_buffer(b0)->ip.adj_index[VLIB_TX];
+ lkdi1 = vnet_buffer(b1)->ip.adj_index[VLIB_TX];
+ lkd0 = lookup_dpo_get(lkdi0);
+ lkd1 = lookup_dpo_get(lkdi1);
+
+ /*
+ * choose between a lookup using the fib index in the DPO
+ * or getting the FIB index from the interface.
+ */
+ if (table_from_interface)
+ {
+ fib_index0 =
+ ip4_fib_table_get_index_for_sw_if_index(
+ vnet_buffer(b0)->sw_if_index[VLIB_RX]);
+ fib_index1 =
+ ip4_fib_table_get_index_for_sw_if_index(
+ vnet_buffer(b1)->sw_if_index[VLIB_RX]);
+ }
+ else
+ {
+ fib_index0 = lkd0->lkd_fib_index;
+ fib_index1 = lkd1->lkd_fib_index;
+ }
+
+ /*
+ * choose between a source or destination address lookup in the table
+ */
+ if (input_src_addr)
+ {
+ input_addr0 = &ip0->src_address;
+ input_addr1 = &ip1->src_address;
+ }
+ else
+ {
+ input_addr0 = &ip0->dst_address;
+ input_addr1 = &ip1->dst_address;
+ }
+
+ /* do lookup */
+ ip4_src_fib_lookup_two (fib_index0, fib_index1,
+ input_addr0, input_addr1,
+ &lbi0, &lbi1);
+ lb0 = load_balance_get(lbi0);
+ lb1 = load_balance_get(lbi1);
+
+ vnet_buffer(b0)->sw_if_index[VLIB_TX] = fib_index0;
+ vnet_buffer(b1)->sw_if_index[VLIB_TX] = fib_index1;
+
+ /* Use flow hash to compute multipath adjacency. */
+ hash_c0 = vnet_buffer (b0)->ip.flow_hash = 0;
+ hash_c1 = vnet_buffer (b1)->ip.flow_hash = 0;
+
+ if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
+ {
+ flow_hash_config0 = lb0->lb_hash_config;
+ hash_c0 = vnet_buffer (b0)->ip.flow_hash =
+ ip4_compute_flow_hash (ip0, flow_hash_config0);
+ }
+
+ if (PREDICT_FALSE (lb1->lb_n_buckets > 1))
+ {
+ flow_hash_config1 = lb1->lb_hash_config;
+ hash_c1 = vnet_buffer (b1)->ip.flow_hash =
+ ip4_compute_flow_hash (ip1, flow_hash_config1);
+ }
+
+ dpo0 = load_balance_get_bucket_i(lb0,
+ (hash_c0 &
+ (lb0->lb_n_buckets_minus_1)));
+ dpo1 = load_balance_get_bucket_i(lb1,
+ (hash_c1 &
+ (lb1->lb_n_buckets_minus_1)));
+
+ next0 = dpo0->dpoi_next_node;
+ next1 = dpo1->dpoi_next_node;
+ vnet_buffer(b0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
+ vnet_buffer(b1)->ip.adj_index[VLIB_TX] = dpo1->dpoi_index;
+
+ vlib_increment_combined_counter
+ (cm, cpu_index, lbi0, 1,
+ vlib_buffer_length_in_chain (vm, b0));
+ vlib_increment_combined_counter
+ (cm, cpu_index, lbi1, 1,
+ vlib_buffer_length_in_chain (vm, b1));
+
+ if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ lookup_trace_t *tr = vlib_add_trace (vm, node,
+ b0, sizeof (*tr));
+ tr->fib_index = fib_index0;
+ tr->lbi = lbi0;
+ tr->addr.ip4 = *input_addr0;
+ }
+ if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ lookup_trace_t *tr = vlib_add_trace (vm, node,
+ b1, sizeof (*tr));
+ tr->fib_index = fib_index1;
+ tr->lbi = lbi1;
+ tr->addr.ip4 = *input_addr1;
+ }
+
+ vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
+ to_next, n_left_to_next,
+ bi0, bi1, next0, next1);
+ }
+
+ while (n_left_from > 0 && n_left_to_next > 0)
+ {
+ u32 bi0, lkdi0, lbi0, fib_index0, next0, hash_c0;
+ flow_hash_config_t flow_hash_config0;
+ const ip4_address_t *input_addr;
+ const load_balance_t *lb0;
+ const lookup_dpo_t * lkd0;
+ const ip4_header_t * ip0;
+ const dpo_id_t *dpo0;
+ vlib_buffer_t * b0;
+
+ 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);
+ ip0 = vlib_buffer_get_current (b0);
+
+ /* dst lookup was done by ip4 lookup */
+ lkdi0 = vnet_buffer(b0)->ip.adj_index[VLIB_TX];
+ lkd0 = lookup_dpo_get(lkdi0);
+
+ /*
+ * choose between a lookup using the fib index in the DPO
+ * or getting the FIB index from the interface.
+ */
+ if (table_from_interface)
+ {
+ fib_index0 =
+ ip4_fib_table_get_index_for_sw_if_index(
+ vnet_buffer(b0)->sw_if_index[VLIB_RX]);
+ }
+ else
+ {
+ fib_index0 = lkd0->lkd_fib_index;
+ }
+
+ /*
+ * choose between a source or destination address lookup in the table
+ */
+ if (input_src_addr)
+ {
+ input_addr = &ip0->src_address;
+ }
+ else
+ {
+ input_addr = &ip0->dst_address;
+ }
+
+ /* do lookup */
+ ip4_src_fib_lookup_one (fib_index0, input_addr, &lbi0);
+ lb0 = load_balance_get(lbi0);
+
+ vnet_buffer(b0)->sw_if_index[VLIB_TX] = fib_index0;
+
+ /* Use flow hash to compute multipath adjacency. */
+ hash_c0 = vnet_buffer (b0)->ip.flow_hash = 0;
+
+ if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
+ {
+ flow_hash_config0 = lb0->lb_hash_config;
+ hash_c0 = vnet_buffer (b0)->ip.flow_hash =
+ ip4_compute_flow_hash (ip0, flow_hash_config0);
+ }
+
+ dpo0 = load_balance_get_bucket_i(lb0,
+ (hash_c0 &
+ (lb0->lb_n_buckets_minus_1)));
+
+ next0 = dpo0->dpoi_next_node;
+ vnet_buffer(b0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
+
+ vlib_increment_combined_counter
+ (cm, cpu_index, lbi0, 1,
+ vlib_buffer_length_in_chain (vm, b0));
+
+ if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ lookup_trace_t *tr = vlib_add_trace (vm, node,
+ b0, sizeof (*tr));
+ tr->fib_index = fib_index0;
+ tr->lbi = lbi0;
+ tr->addr.ip4 = *input_addr;
+ }
+
+ 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 from_frame->n_vectors;
+}
+
+static u8 *
+format_lookup_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 *);
+ lookup_trace_t * t = va_arg (*args, lookup_trace_t *);
+ uword indent = format_get_indent (s);
+ s = format (s, "%U fib-index:%d addr:%U load-balance:%d",
+ format_white_space, indent,
+ t->fib_index,
+ format_ip46_address, &t->addr, IP46_TYPE_ANY,
+ t->lbi);
+ return s;
+}
+
+always_inline uword
+lookup_ip4_dst (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame)
+{
+ return (lookup_dpo_ip4_inline(vm, node, from_frame, 0, 0));
+}
+
+VLIB_REGISTER_NODE (lookup_ip4_dst_node) = {
+ .function = lookup_ip4_dst,
+ .name = "lookup-ip4-dst",
+ .vector_size = sizeof (u32),
+ .sibling_of = "ip4-lookup",
+ .format_trace = format_lookup_trace,
+};
+VLIB_NODE_FUNCTION_MULTIARCH (lookup_ip4_dst_node, lookup_ip4_dst)
+
+always_inline uword
+lookup_ip4_dst_itf (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame)
+{
+ return (lookup_dpo_ip4_inline(vm, node, from_frame, 0, 1));
+}
+
+VLIB_REGISTER_NODE (lookup_ip4_dst_itf_node) = {
+ .function = lookup_ip4_dst_itf,
+ .name = "lookup-ip4-dst-itf",
+ .vector_size = sizeof (u32),
+ .sibling_of = "ip4-lookup",
+ .format_trace = format_lookup_trace,
+};
+VLIB_NODE_FUNCTION_MULTIARCH (lookup_ip4_dst_itf_node, lookup_ip4_dst_itf)
+
+always_inline uword
+lookup_ip4_src (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame)
+{
+ return (lookup_dpo_ip4_inline(vm, node, from_frame, 1, 0));
+}
+
+VLIB_REGISTER_NODE (lookup_ip4_src_node) = {
+ .function = lookup_ip4_src,
+ .name = "lookup-ip4-src",
+ .vector_size = sizeof (u32),
+ .format_trace = format_lookup_trace,
+ .sibling_of = "ip4-lookup",
+};
+VLIB_NODE_FUNCTION_MULTIARCH (lookup_ip4_src_node, lookup_ip4_src)
+
+always_inline uword
+lookup_dpo_ip6_inline (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame,
+ int input_src_addr,
+ int table_from_interface)
+{
+ vlib_combined_counter_main_t * cm = &load_balance_main.lbm_to_counters;
+ u32 n_left_from, next_index, * from, * to_next;
+ u32 cpu_index = os_get_cpu_number();
+
+ from = vlib_frame_vector_args (from_frame);
+ n_left_from = 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, lkdi0, lbi0, fib_index0, next0, hash_c0;
+ flow_hash_config_t flow_hash_config0;
+ const ip6_address_t *input_addr0;
+ const load_balance_t *lb0;
+ const lookup_dpo_t * lkd0;
+ const ip6_header_t * ip0;
+ const dpo_id_t *dpo0;
+ vlib_buffer_t * b0;
+ u32 bi1, lkdi1, lbi1, fib_index1, next1, hash_c1;
+ flow_hash_config_t flow_hash_config1;
+ const ip6_address_t *input_addr1;
+ const load_balance_t *lb1;
+ const lookup_dpo_t * lkd1;
+ const ip6_header_t * ip1;
+ const dpo_id_t *dpo1;
+ vlib_buffer_t * b1;
+
+ /* Prefetch next iteration. */
+ {
+ vlib_buffer_t * p2, * p3;
+
+ p2 = vlib_get_buffer (vm, from[2]);
+ p3 = vlib_get_buffer (vm, from[3]);
+
+ vlib_prefetch_buffer_header (p2, LOAD);
+ vlib_prefetch_buffer_header (p3, LOAD);
+
+ CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE);
+ CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE);
+ }
+
+ bi0 = from[0];
+ to_next[0] = bi0;
+ bi1 = from[1];
+ to_next[1] = bi1;
+ from += 2;
+ to_next += 2;
+ n_left_from -= 2;
+ n_left_to_next -= 2;
+
+ b0 = vlib_get_buffer (vm, bi0);
+ ip0 = vlib_buffer_get_current (b0);
+ b1 = vlib_get_buffer (vm, bi1);
+ ip1 = vlib_buffer_get_current (b1);
+
+ /* dst lookup was done by ip6 lookup */
+ lkdi0 = vnet_buffer(b0)->ip.adj_index[VLIB_TX];
+ lkdi1 = vnet_buffer(b1)->ip.adj_index[VLIB_TX];
+ lkd0 = lookup_dpo_get(lkdi0);
+ lkd1 = lookup_dpo_get(lkdi1);
+
+ /*
+ * choose between a lookup using the fib index in the DPO
+ * or getting the FIB index from the interface.
+ */
+ if (table_from_interface)
+ {
+ fib_index0 =
+ ip6_fib_table_get_index_for_sw_if_index(
+ vnet_buffer(b0)->sw_if_index[VLIB_RX]);
+ fib_index1 =
+ ip6_fib_table_get_index_for_sw_if_index(
+ vnet_buffer(b1)->sw_if_index[VLIB_RX]);
+ }
+ else
+ {
+ fib_index0 = lkd0->lkd_fib_index;
+ fib_index1 = lkd1->lkd_fib_index;
+ }
+
+ /*
+ * choose between a source or destination address lookup in the table
+ */
+ if (input_src_addr)
+ {
+ input_addr0 = &ip0->src_address;
+ input_addr1 = &ip1->src_address;
+ }
+ else
+ {
+ input_addr0 = &ip0->dst_address;
+ input_addr1 = &ip1->dst_address;
+ }
+
+ /* do src lookup */
+ lbi0 = ip6_fib_table_fwding_lookup(&ip6_main,
+ fib_index0,
+ input_addr0);
+ lbi1 = ip6_fib_table_fwding_lookup(&ip6_main,
+ fib_index1,
+ input_addr1);
+ lb0 = load_balance_get(lbi0);
+ lb1 = load_balance_get(lbi1);
+
+ vnet_buffer(b0)->sw_if_index[VLIB_TX] = fib_index0;
+ vnet_buffer(b1)->sw_if_index[VLIB_TX] = fib_index1;
+
+ /* Use flow hash to compute multipath adjacency. */
+ hash_c0 = vnet_buffer (b0)->ip.flow_hash = 0;
+ hash_c1 = vnet_buffer (b1)->ip.flow_hash = 0;
+
+ if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
+ {
+ flow_hash_config0 = lb0->lb_hash_config;
+ hash_c0 = vnet_buffer (b0)->ip.flow_hash =
+ ip6_compute_flow_hash (ip0, flow_hash_config0);
+ }
+
+ if (PREDICT_FALSE (lb1->lb_n_buckets > 1))
+ {
+ flow_hash_config1 = lb1->lb_hash_config;
+ hash_c1 = vnet_buffer (b1)->ip.flow_hash =
+ ip6_compute_flow_hash (ip1, flow_hash_config1);
+ }
+
+ dpo0 = load_balance_get_bucket_i(lb0,
+ (hash_c0 &
+ (lb0->lb_n_buckets_minus_1)));
+ dpo1 = load_balance_get_bucket_i(lb1,
+ (hash_c1 &
+ (lb1->lb_n_buckets_minus_1)));
+
+ next0 = dpo0->dpoi_next_node;
+ next1 = dpo1->dpoi_next_node;
+ vnet_buffer(b0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
+ vnet_buffer(b1)->ip.adj_index[VLIB_TX] = dpo1->dpoi_index;
+
+ vlib_increment_combined_counter
+ (cm, cpu_index, lbi0, 1,
+ vlib_buffer_length_in_chain (vm, b0));
+ vlib_increment_combined_counter
+ (cm, cpu_index, lbi1, 1,
+ vlib_buffer_length_in_chain (vm, b1));
+
+ if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ lookup_trace_t *tr = vlib_add_trace (vm, node,
+ b0, sizeof (*tr));
+ tr->fib_index = fib_index0;
+ tr->lbi = lbi0;
+ tr->addr.ip6 = *input_addr0;
+ }
+ if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ lookup_trace_t *tr = vlib_add_trace (vm, node,
+ b1, sizeof (*tr));
+ tr->fib_index = fib_index1;
+ tr->lbi = lbi1;
+ tr->addr.ip6 = *input_addr1;
+ }
+ vlib_validate_buffer_enqueue_x2(vm, node, next_index, to_next,
+ n_left_to_next, bi0, bi1,
+ next0, next1);
+ }
+ while (n_left_from > 0 && n_left_to_next > 0)
+ {
+ u32 bi0, lkdi0, lbi0, fib_index0, next0, hash_c0;
+ flow_hash_config_t flow_hash_config0;
+ const ip6_address_t *input_addr0;
+ const load_balance_t *lb0;
+ const lookup_dpo_t * lkd0;
+ const ip6_header_t * ip0;
+ const dpo_id_t *dpo0;
+ vlib_buffer_t * b0;
+
+ 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);
+ ip0 = vlib_buffer_get_current (b0);
+
+ /* dst lookup was done by ip6 lookup */
+ lkdi0 = vnet_buffer(b0)->ip.adj_index[VLIB_TX];
+ lkd0 = lookup_dpo_get(lkdi0);
+
+ /*
+ * choose between a lookup using the fib index in the DPO
+ * or getting the FIB index from the interface.
+ */
+ if (table_from_interface)
+ {
+ fib_index0 =
+ ip6_fib_table_get_index_for_sw_if_index(
+ vnet_buffer(b0)->sw_if_index[VLIB_RX]);
+ }
+ else
+ {
+ fib_index0 = lkd0->lkd_fib_index;
+ }
+
+ /*
+ * choose between a source or destination address lookup in the table
+ */
+ if (input_src_addr)
+ {
+ input_addr0 = &ip0->src_address;
+ }
+ else
+ {
+ input_addr0 = &ip0->dst_address;
+ }
+
+ /* do src lookup */
+ lbi0 = ip6_fib_table_fwding_lookup(&ip6_main,
+ fib_index0,
+ input_addr0);
+ lb0 = load_balance_get(lbi0);
+
+ vnet_buffer(b0)->sw_if_index[VLIB_TX] = fib_index0;
+
+ /* Use flow hash to compute multipath adjacency. */
+ hash_c0 = vnet_buffer (b0)->ip.flow_hash = 0;
+
+ if (PREDICT_FALSE (lb0->lb_n_buckets > 1))
+ {
+ flow_hash_config0 = lb0->lb_hash_config;
+ hash_c0 = vnet_buffer (b0)->ip.flow_hash =
+ ip6_compute_flow_hash (ip0, flow_hash_config0);
+ }
+
+ dpo0 = load_balance_get_bucket_i(lb0,
+ (hash_c0 &
+ (lb0->lb_n_buckets_minus_1)));
+
+ next0 = dpo0->dpoi_next_node;
+ vnet_buffer(b0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
+
+ vlib_increment_combined_counter
+ (cm, cpu_index, lbi0, 1,
+ vlib_buffer_length_in_chain (vm, b0));
+
+ if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ lookup_trace_t *tr = vlib_add_trace (vm, node,
+ b0, sizeof (*tr));
+ tr->fib_index = fib_index0;
+ tr->lbi = lbi0;
+ tr->addr.ip6 = *input_addr0;
+ }
+ 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 from_frame->n_vectors;
+}
+
+always_inline uword
+lookup_ip6_dst (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame)
+{
+ return (lookup_dpo_ip6_inline(vm, node, from_frame, 0 /*use src*/, 0));
+}
+
+VLIB_REGISTER_NODE (lookup_ip6_dst_node) = {
+ .function = lookup_ip6_dst,
+ .name = "lookup-ip6-dst",
+ .vector_size = sizeof (u32),
+ .format_trace = format_lookup_trace,
+ .sibling_of = "ip6-lookup",
+};
+VLIB_NODE_FUNCTION_MULTIARCH (lookup_ip6_dst_node, lookup_ip6_dst)
+
+always_inline uword
+lookup_ip6_dst_itf (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame)
+{
+ return (lookup_dpo_ip6_inline(vm, node, from_frame, 0 /*use src*/, 1));
+}
+
+VLIB_REGISTER_NODE (lookup_ip6_dst_itf_node) = {
+ .function = lookup_ip6_dst_itf,
+ .name = "lookup-ip6-dst-itf",
+ .vector_size = sizeof (u32),
+ .format_trace = format_lookup_trace,
+ .sibling_of = "ip6-lookup",
+};
+VLIB_NODE_FUNCTION_MULTIARCH (lookup_ip6_dst_itf_node, lookup_ip6_dst_itf)
+
+always_inline uword
+lookup_ip6_src (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame)
+{
+ return (lookup_dpo_ip6_inline(vm, node, from_frame, 1, 0));
+}
+
+VLIB_REGISTER_NODE (lookup_ip6_src_node) = {
+ .function = lookup_ip6_src,
+ .name = "lookup-ip6-src",
+ .vector_size = sizeof (u32),
+ .format_trace = format_lookup_trace,
+ .sibling_of = "ip6-lookup",
+};
+VLIB_NODE_FUNCTION_MULTIARCH (lookup_ip6_src_node, lookup_ip6_src)
+
+always_inline uword
+lookup_dpo_mpls_inline (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame,
+ int table_from_interface)
+{
+ u32 n_left_from, next_index, * from, * to_next;
+ u32 cpu_index = os_get_cpu_number();
+ vlib_combined_counter_main_t * cm = &load_balance_main.lbm_to_counters;
+
+ from = vlib_frame_vector_args (from_frame);
+ n_left_from = 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) */
+ /* } */
+
+ while (n_left_from > 0 && n_left_to_next > 0)
+ {
+ u32 bi0, lkdi0, lbi0, fib_index0, next0;
+ const mpls_unicast_header_t * hdr0;
+ const load_balance_t *lb0;
+ const lookup_dpo_t * lkd0;
+ const dpo_id_t *dpo0;
+ vlib_buffer_t * b0;
+
+ 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);
+ hdr0 = vlib_buffer_get_current (b0);
+
+ /* dst lookup was done by mpls lookup */
+ lkdi0 = vnet_buffer(b0)->ip.adj_index[VLIB_TX];
+ lkd0 = lookup_dpo_get(lkdi0);
+
+ /*
+ * choose between a lookup using the fib index in the DPO
+ * or getting the FIB index from the interface.
+ */
+ if (table_from_interface)
+ {
+ fib_index0 =
+ mpls_fib_table_get_index_for_sw_if_index(
+ vnet_buffer(b0)->sw_if_index[VLIB_RX]);
+ }
+ else
+ {
+ fib_index0 = lkd0->lkd_fib_index;
+ }
+
+ /* do lookup */
+ lbi0 = mpls_fib_table_forwarding_lookup (fib_index0, hdr0);
+ lb0 = load_balance_get(lbi0);
+ dpo0 = load_balance_get_bucket_i(lb0, 0);
+
+ next0 = dpo0->dpoi_next_node;
+ vnet_buffer(b0)->ip.adj_index[VLIB_TX] = dpo0->dpoi_index;
+
+ vlib_increment_combined_counter
+ (cm, cpu_index, lbi0, 1,
+ vlib_buffer_length_in_chain (vm, b0));
+
+ if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ lookup_trace_t *tr = vlib_add_trace (vm, node,
+ b0, sizeof (*tr));
+ tr->fib_index = fib_index0;
+ tr->lbi = lbi0;
+ tr->hdr = *hdr0;
+ }
+
+ 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 from_frame->n_vectors;
+}
+
+static u8 *
+format_lookup_mpls_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 *);
+ lookup_trace_t * t = va_arg (*args, lookup_trace_t *);
+ uword indent = format_get_indent (s);
+ mpls_unicast_header_t hdr;
+
+ hdr.label_exp_s_ttl = clib_net_to_host_u32(t->hdr.label_exp_s_ttl);
+
+ s = format (s, "%U fib-index:%d hdr:%U load-balance:%d",
+ format_white_space, indent,
+ t->fib_index,
+ format_mpls_header, hdr,
+ t->lbi);
+ return s;
+}
+
+always_inline uword
+lookup_mpls_dst (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame)
+{
+ return (lookup_dpo_mpls_inline(vm, node, from_frame, 0));
+}
+
+VLIB_REGISTER_NODE (lookup_mpls_dst_node) = {
+ .function = lookup_mpls_dst,
+ .name = "lookup-mpls-dst",
+ .vector_size = sizeof (u32),
+ .sibling_of = "mpls-lookup",
+ .format_trace = format_lookup_mpls_trace,
+ .n_next_nodes = 0,
+};
+VLIB_NODE_FUNCTION_MULTIARCH (lookup_mpls_dst_node, lookup_mpls_dst)
+
+always_inline uword
+lookup_mpls_dst_itf (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame)
+{
+ return (lookup_dpo_mpls_inline(vm, node, from_frame, 1));
+}
+
+VLIB_REGISTER_NODE (lookup_mpls_dst_itf_node) = {
+ .function = lookup_mpls_dst_itf,
+ .name = "lookup-mpls-dst-itf",
+ .vector_size = sizeof (u32),
+ .sibling_of = "mpls-lookup",
+ .format_trace = format_lookup_mpls_trace,
+ .n_next_nodes = 0,
+};
+VLIB_NODE_FUNCTION_MULTIARCH (lookup_mpls_dst_itf_node, lookup_mpls_dst_itf)
+
+static void
+lookup_dpo_mem_show (void)
+{
+ fib_show_memory_usage("Lookup",
+ pool_elts(lookup_dpo_pool),
+ pool_len(lookup_dpo_pool),
+ sizeof(lookup_dpo_t));
+}
+
+const static dpo_vft_t lkd_vft = {
+ .dv_lock = lookup_dpo_lock,
+ .dv_unlock = lookup_dpo_unlock,
+ .dv_format = format_lookup_dpo,
+};
+const static dpo_vft_t lkd_vft_w_mem_show = {
+ .dv_lock = lookup_dpo_lock,
+ .dv_unlock = lookup_dpo_unlock,
+ .dv_format = format_lookup_dpo,
+ .dv_mem_show = lookup_dpo_mem_show,
+};
+
+const static char* const lookup_src_ip4_nodes[] =
+{
+ "lookup-ip4-src",
+ NULL,
+};
+const static char* const lookup_src_ip6_nodes[] =
+{
+ "lookup-ip6-src",
+ NULL,
+};
+const static char* const * const lookup_src_nodes[DPO_PROTO_NUM] =
+{
+ [DPO_PROTO_IP4] = lookup_src_ip4_nodes,
+ [DPO_PROTO_IP6] = lookup_src_ip6_nodes,
+ [DPO_PROTO_MPLS] = NULL,
+};
+
+const static char* const lookup_dst_ip4_nodes[] =
+{
+ "lookup-ip4-dst",
+ NULL,
+};
+const static char* const lookup_dst_ip6_nodes[] =
+{
+ "lookup-ip6-dst",
+ NULL,
+};
+const static char* const lookup_dst_mpls_nodes[] =
+{
+ "lookup-mpls-dst",
+ NULL,
+};
+const static char* const * const lookup_dst_nodes[DPO_PROTO_NUM] =
+{
+ [DPO_PROTO_IP4] = lookup_dst_ip4_nodes,
+ [DPO_PROTO_IP6] = lookup_dst_ip6_nodes,
+ [DPO_PROTO_MPLS] = lookup_dst_mpls_nodes,
+};
+
+const static char* const lookup_dst_from_interface_ip4_nodes[] =
+{
+ "lookup-ip4-dst-itf",
+ NULL,
+};
+const static char* const lookup_dst_from_interface_ip6_nodes[] =
+{
+ "lookup-ip6-dst-itf",
+ NULL,
+};
+const static char* const lookup_dst_from_interface_mpls_nodes[] =
+{
+ "lookup-mpls-dst-itf",
+ NULL,
+};
+const static char* const * const lookup_dst_from_interface_nodes[DPO_PROTO_NUM] =
+{
+ [DPO_PROTO_IP4] = lookup_dst_from_interface_ip4_nodes,
+ [DPO_PROTO_IP6] = lookup_dst_from_interface_ip6_nodes,
+ [DPO_PROTO_MPLS] = lookup_dst_from_interface_mpls_nodes,
+};
+
+
+void
+lookup_dpo_module_init (void)
+{
+ dpo_register(DPO_LOOKUP, &lkd_vft_w_mem_show, NULL);
+
+ /*
+ * There are various sorts of lookup; src or dst addr v4 /v6 etc.
+ * there isn't an object type for each (there is only the lookup_dpo_t),
+ * but, for performance reasons, there is a data plane function, and hence
+ * VLIB node for each. VLIB graph node construction is based on DPO types
+ * so we create sub-types.
+ */
+ lookup_dpo_sub_types[LOOKUP_SUB_TYPE_SRC] =
+ dpo_register_new_type(&lkd_vft, lookup_src_nodes);
+ lookup_dpo_sub_types[LOOKUP_SUB_TYPE_DST] =
+ dpo_register_new_type(&lkd_vft, lookup_dst_nodes);
+ lookup_dpo_sub_types[LOOKUP_SUB_TYPE_DST_TABLE_FROM_INTERFACE] =
+ dpo_register_new_type(&lkd_vft, lookup_dst_from_interface_nodes);
+}
diff --git a/src/vnet/dpo/lookup_dpo.h b/src/vnet/dpo/lookup_dpo.h
new file mode 100644
index 00000000000..ff283388868
--- /dev/null
+++ b/src/vnet/dpo/lookup_dpo.h
@@ -0,0 +1,108 @@
+/*
+ * 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.
+ */
+
+#ifndef __LOOKUP_DPO_H__
+#define __LOOKUP_DPO_H__
+
+#include <vnet/vnet.h>
+#include <vnet/fib/fib_types.h>
+#include <vnet/dpo/dpo.h>
+
+/**
+ * Switch to use the packet's source or destination address for lookup
+ */
+typedef enum lookup_input_t_ {
+ LOOKUP_INPUT_SRC_ADDR,
+ LOOKUP_INPUT_DST_ADDR,
+} __attribute__ ((packed)) lookup_input_t;
+
+#define LOOKUP_INPUTS { \
+ [LOOKUP_INPUT_SRC_ADDR] = "src-address", \
+ [LOOKUP_INPUT_DST_ADDR] = "dst-address", \
+}
+
+/**
+ * Switch to use the packet's source or destination address for lookup
+ */
+typedef enum lookup_table_t_ {
+ LOOKUP_TABLE_FROM_INPUT_INTERFACE,
+ LOOKUP_TABLE_FROM_CONFIG,
+} __attribute__ ((packed)) lookup_table_t;
+
+#define LOOKUP_TABLES { \
+ [LOOKUP_INPUT_SRC_ADDR] = "table-input-interface", \
+ [LOOKUP_INPUT_DST_ADDR] = "table-configured", \
+}
+
+/**
+ * A representation of an MPLS label for imposition in the data-path
+ */
+typedef struct lookup_dpo_t
+{
+ /**
+ * The FIB, or interface from which to get a FIB, in which to perform
+ * the next lookup;
+ */
+ fib_node_index_t lkd_fib_index;
+
+ /**
+ * The protocol of the FIB for the lookup, and hence
+ * the protocol of the packet
+ */
+ dpo_proto_t lkd_proto;
+
+ /**
+ * Switch to use src or dst address
+ */
+ lookup_input_t lkd_input;
+
+ /**
+ * Switch to use the table index passed, or the table of the input interface
+ */
+ lookup_table_t lkd_table;
+
+ /**
+ * Number of locks
+ */
+ u16 lkd_locks;
+} lookup_dpo_t;
+
+extern void lookup_dpo_add_or_lock_w_fib_index(fib_node_index_t fib_index,
+ dpo_proto_t proto,
+ lookup_input_t input,
+ lookup_table_t table,
+ dpo_id_t *dpo);
+extern void lookup_dpo_add_or_lock_w_table_id(u32 table_id,
+ dpo_proto_t proto,
+ lookup_input_t input,
+ lookup_table_t table,
+ dpo_id_t *dpo);
+
+extern u8* format_lookup_dpo(u8 *s, va_list *args);
+
+/*
+ * Encapsulation violation for fast data-path access
+ */
+extern lookup_dpo_t *lookup_dpo_pool;
+
+static inline lookup_dpo_t *
+lookup_dpo_get (index_t index)
+{
+ return (pool_elt_at_index(lookup_dpo_pool, index));
+}
+
+extern void lookup_dpo_module_init(void);
+
+#endif
diff --git a/src/vnet/dpo/mpls_label_dpo.c b/src/vnet/dpo/mpls_label_dpo.c
new file mode 100644
index 00000000000..bbdc9666503
--- /dev/null
+++ b/src/vnet/dpo/mpls_label_dpo.c
@@ -0,0 +1,570 @@
+/*
+ * 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 <vnet/ip/ip.h>
+#include <vnet/dpo/mpls_label_dpo.h>
+#include <vnet/mpls/mpls.h>
+
+/*
+ * pool of all MPLS Label DPOs
+ */
+mpls_label_dpo_t *mpls_label_dpo_pool;
+
+static mpls_label_dpo_t *
+mpls_label_dpo_alloc (void)
+{
+ mpls_label_dpo_t *mld;
+
+ pool_get_aligned(mpls_label_dpo_pool, mld, CLIB_CACHE_LINE_BYTES);
+ memset(mld, 0, sizeof(*mld));
+
+ dpo_reset(&mld->mld_dpo);
+
+ return (mld);
+}
+
+static index_t
+mpls_label_dpo_get_index (mpls_label_dpo_t *mld)
+{
+ return (mld - mpls_label_dpo_pool);
+}
+
+index_t
+mpls_label_dpo_create (mpls_label_t *label_stack,
+ mpls_eos_bit_t eos,
+ u8 ttl,
+ u8 exp,
+ dpo_proto_t payload_proto,
+ const dpo_id_t *dpo)
+{
+ mpls_label_dpo_t *mld;
+ u32 ii;
+
+ mld = mpls_label_dpo_alloc();
+ mld->mld_n_labels = vec_len(label_stack);
+ mld->mld_n_hdr_bytes = mld->mld_n_labels * sizeof(mld->mld_hdr[0]);
+ mld->mld_payload_proto = payload_proto;
+
+ /*
+ * construct label rewrite headers for each value value passed.
+ * get the header in network byte order since we will paint it
+ * on a packet in the data-plane
+ */
+
+ for (ii = 0; ii < mld->mld_n_labels-1; ii++)
+ {
+ vnet_mpls_uc_set_label(&mld->mld_hdr[ii].label_exp_s_ttl, label_stack[ii]);
+ vnet_mpls_uc_set_ttl(&mld->mld_hdr[ii].label_exp_s_ttl, 255);
+ vnet_mpls_uc_set_exp(&mld->mld_hdr[ii].label_exp_s_ttl, 0);
+ vnet_mpls_uc_set_s(&mld->mld_hdr[ii].label_exp_s_ttl, MPLS_NON_EOS);
+ mld->mld_hdr[ii].label_exp_s_ttl =
+ clib_host_to_net_u32(mld->mld_hdr[ii].label_exp_s_ttl);
+ }
+
+ /*
+ * the inner most label
+ */
+ ii = mld->mld_n_labels-1;
+
+ vnet_mpls_uc_set_label(&mld->mld_hdr[ii].label_exp_s_ttl, label_stack[ii]);
+ vnet_mpls_uc_set_ttl(&mld->mld_hdr[ii].label_exp_s_ttl, ttl);
+ vnet_mpls_uc_set_exp(&mld->mld_hdr[ii].label_exp_s_ttl, exp);
+ vnet_mpls_uc_set_s(&mld->mld_hdr[ii].label_exp_s_ttl, eos);
+ mld->mld_hdr[ii].label_exp_s_ttl =
+ clib_host_to_net_u32(mld->mld_hdr[ii].label_exp_s_ttl);
+
+ /*
+ * stack this label objct on its parent.
+ */
+ dpo_stack(DPO_MPLS_LABEL,
+ mld->mld_payload_proto,
+ &mld->mld_dpo,
+ dpo);
+
+ return (mpls_label_dpo_get_index(mld));
+}
+
+u8*
+format_mpls_label_dpo (u8 *s, va_list *args)
+{
+ index_t index = va_arg (*args, index_t);
+ u32 indent = va_arg (*args, u32);
+ mpls_unicast_header_t hdr;
+ mpls_label_dpo_t *mld;
+ u32 ii;
+
+ mld = mpls_label_dpo_get(index);
+
+ s = format(s, "mpls-label:[%d]:", index);
+
+ for (ii = 0; ii < mld->mld_n_labels; ii++)
+ {
+ hdr.label_exp_s_ttl =
+ clib_net_to_host_u32(mld->mld_hdr[ii].label_exp_s_ttl);
+ s = format(s, "%U", format_mpls_header, hdr);
+ }
+
+ s = format(s, "\n%U", format_white_space, indent);
+ s = format(s, "%U", format_dpo_id, &mld->mld_dpo, indent+2);
+
+ return (s);
+}
+
+static void
+mpls_label_dpo_lock (dpo_id_t *dpo)
+{
+ mpls_label_dpo_t *mld;
+
+ mld = mpls_label_dpo_get(dpo->dpoi_index);
+
+ mld->mld_locks++;
+}
+
+static void
+mpls_label_dpo_unlock (dpo_id_t *dpo)
+{
+ mpls_label_dpo_t *mld;
+
+ mld = mpls_label_dpo_get(dpo->dpoi_index);
+
+ mld->mld_locks--;
+
+ if (0 == mld->mld_locks)
+ {
+ dpo_reset(&mld->mld_dpo);
+ pool_put(mpls_label_dpo_pool, mld);
+ }
+}
+
+/**
+ * @brief A struct to hold tracing information for the MPLS label imposition
+ * node.
+ */
+typedef struct mpls_label_imposition_trace_t_
+{
+ /**
+ * The MPLS header imposed
+ */
+ mpls_unicast_header_t hdr;
+} mpls_label_imposition_trace_t;
+
+always_inline uword
+mpls_label_imposition_inline (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame,
+ u8 payload_is_ip4,
+ u8 payload_is_ip6)
+{
+ u32 n_left_from, next_index, * from, * to_next;
+
+ from = vlib_frame_vector_args (from_frame);
+ n_left_from = 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)
+ {
+ mpls_unicast_header_t *hdr0, *hdr1;
+ mpls_label_dpo_t *mld0, *mld1;
+ u32 bi0, mldi0, bi1, mldi1;
+ vlib_buffer_t * b0, *b1;
+ u32 next0, next1;
+ u8 ttl0, ttl1;
+
+ bi0 = to_next[0] = from[0];
+ bi1 = to_next[1] = from[1];
+
+ /* Prefetch next iteration. */
+ {
+ vlib_buffer_t * p2, * p3;
+
+ p2 = vlib_get_buffer (vm, from[2]);
+ p3 = vlib_get_buffer (vm, from[3]);
+
+ vlib_prefetch_buffer_header (p2, STORE);
+ vlib_prefetch_buffer_header (p3, STORE);
+
+ CLIB_PREFETCH (p2->data, sizeof (hdr0[0]), STORE);
+ CLIB_PREFETCH (p3->data, sizeof (hdr0[0]), STORE);
+ }
+
+ from += 2;
+ to_next += 2;
+ n_left_from -= 2;
+ n_left_to_next -= 2;
+
+ b0 = vlib_get_buffer (vm, bi0);
+ b1 = vlib_get_buffer (vm, bi1);
+
+ /* dst lookup was done by ip4 lookup */
+ mldi0 = vnet_buffer(b0)->ip.adj_index[VLIB_TX];
+ mldi1 = vnet_buffer(b1)->ip.adj_index[VLIB_TX];
+ mld0 = mpls_label_dpo_get(mldi0);
+ mld1 = mpls_label_dpo_get(mldi1);
+
+ if (payload_is_ip4)
+ {
+ /*
+ * decrement the TTL on ingress to the LSP
+ */
+ ip4_header_t * ip0 = vlib_buffer_get_current(b0);
+ ip4_header_t * ip1 = vlib_buffer_get_current(b1);
+ u32 checksum0;
+ u32 checksum1;
+
+ checksum0 = ip0->checksum + clib_host_to_net_u16 (0x0100);
+ checksum1 = ip1->checksum + clib_host_to_net_u16 (0x0100);
+
+ checksum0 += checksum0 >= 0xffff;
+ checksum1 += checksum1 >= 0xffff;
+
+ ip0->checksum = checksum0;
+ ip1->checksum = checksum1;
+
+ ip0->ttl -= 1;
+ ip1->ttl -= 1;
+
+ ttl1 = ip1->ttl;
+ ttl0 = ip0->ttl;
+ }
+ else if (payload_is_ip6)
+ {
+ /*
+ * decrement the TTL on ingress to the LSP
+ */
+ ip6_header_t * ip0 = vlib_buffer_get_current(b0);
+ ip6_header_t * ip1 = vlib_buffer_get_current(b1);
+
+
+ ip0->hop_limit -= 1;
+ ip1->hop_limit -= 1;
+
+ ttl0 = ip0->hop_limit;
+ ttl1 = ip1->hop_limit;
+ }
+ else
+ {
+ /*
+ * else, the packet to be encapped is an MPLS packet
+ */
+ if (PREDICT_TRUE(vnet_buffer(b0)->mpls.first))
+ {
+ /*
+ * The first label to be imposed on the packet. this is a label swap.
+ * in which case we stashed the TTL and EXP bits in the
+ * packet in the lookup node
+ */
+ ASSERT(0 != vnet_buffer (b0)->mpls.ttl);
+
+ ttl0 = vnet_buffer(b0)->mpls.ttl - 1;
+ }
+ else
+ {
+ /*
+ * not the first label. implying we are recusring down a chain of
+ * output labels.
+ * Each layer is considered a new LSP - hence the TTL is reset.
+ */
+ ttl0 = 255;
+ }
+ if (PREDICT_TRUE(vnet_buffer(b1)->mpls.first))
+ {
+ ASSERT(1 != vnet_buffer (b1)->mpls.ttl);
+ ttl1 = vnet_buffer(b1)->mpls.ttl - 1;
+ }
+ else
+ {
+ ttl1 = 255;
+ }
+ }
+ vnet_buffer(b0)->mpls.first = 0;
+ vnet_buffer(b1)->mpls.first = 0;
+
+ /* Paint the MPLS header */
+ vlib_buffer_advance(b0, -(mld0->mld_n_hdr_bytes));
+ vlib_buffer_advance(b1, -(mld1->mld_n_hdr_bytes));
+
+ hdr0 = vlib_buffer_get_current(b0);
+ hdr1 = vlib_buffer_get_current(b1);
+
+ clib_memcpy(hdr0, mld0->mld_hdr, mld0->mld_n_hdr_bytes);
+ clib_memcpy(hdr1, mld1->mld_hdr, mld1->mld_n_hdr_bytes);
+
+ /* fixup the TTL for the inner most label */
+ hdr0 = hdr0 + (mld0->mld_n_labels - 1);
+ hdr1 = hdr1 + (mld1->mld_n_labels - 1);
+ ((char*)hdr0)[3] = ttl0;
+ ((char*)hdr1)[3] = ttl1;
+
+ next0 = mld0->mld_dpo.dpoi_next_node;
+ next1 = mld1->mld_dpo.dpoi_next_node;
+ vnet_buffer(b0)->ip.adj_index[VLIB_TX] = mld0->mld_dpo.dpoi_index;
+ vnet_buffer(b1)->ip.adj_index[VLIB_TX] = mld1->mld_dpo.dpoi_index;
+
+ if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ mpls_label_imposition_trace_t *tr =
+ vlib_add_trace (vm, node, b0, sizeof (*tr));
+ tr->hdr = *hdr0;
+ }
+ if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ mpls_label_imposition_trace_t *tr =
+ vlib_add_trace (vm, node, b1, sizeof (*tr));
+ tr->hdr = *hdr1;
+ }
+
+ vlib_validate_buffer_enqueue_x2(vm, node, next_index, to_next,
+ n_left_to_next,
+ bi0, bi1, next0, next1);
+ }
+
+ while (n_left_from > 0 && n_left_to_next > 0)
+ {
+ mpls_unicast_header_t *hdr0;
+ mpls_label_dpo_t *mld0;
+ vlib_buffer_t * b0;
+ u32 bi0, mldi0;
+ u32 next0;
+ u8 ttl;
+
+ 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);
+
+ /* dst lookup was done by ip4 lookup */
+ mldi0 = vnet_buffer(b0)->ip.adj_index[VLIB_TX];
+ mld0 = mpls_label_dpo_get(mldi0);
+
+ if (payload_is_ip4)
+ {
+ /*
+ * decrement the TTL on ingress to the LSP
+ */
+ ip4_header_t * ip0 = vlib_buffer_get_current(b0);
+ u32 checksum0;
+
+ checksum0 = ip0->checksum + clib_host_to_net_u16 (0x0100);
+ checksum0 += checksum0 >= 0xffff;
+
+ ip0->checksum = checksum0;
+ ip0->ttl -= 1;
+ ttl = ip0->ttl;
+ }
+ else if (payload_is_ip6)
+ {
+ /*
+ * decrement the TTL on ingress to the LSP
+ */
+ ip6_header_t * ip0 = vlib_buffer_get_current(b0);
+
+ ip0->hop_limit -= 1;
+ ttl = ip0->hop_limit;
+ }
+ else
+ {
+ /*
+ * else, the packet to be encapped is an MPLS packet
+ */
+ if (vnet_buffer(b0)->mpls.first)
+ {
+ /*
+ * The first label to be imposed on the packet. this is a label swap.
+ * in which case we stashed the TTL and EXP bits in the
+ * packet in the lookup node
+ */
+ ASSERT(0 != vnet_buffer (b0)->mpls.ttl);
+
+ ttl = vnet_buffer(b0)->mpls.ttl - 1;
+ }
+ else
+ {
+ /*
+ * not the first label. implying we are recusring down a chain of
+ * output labels.
+ * Each layer is considered a new LSP - hence the TTL is reset.
+ */
+ ttl = 255;
+ }
+ }
+ vnet_buffer(b0)->mpls.first = 0;
+
+ /* Paint the MPLS header */
+ vlib_buffer_advance(b0, -(mld0->mld_n_hdr_bytes));
+ hdr0 = vlib_buffer_get_current(b0);
+ clib_memcpy(hdr0, mld0->mld_hdr, mld0->mld_n_hdr_bytes);
+
+ /* fixup the TTL for the inner most label */
+ hdr0 = hdr0 + (mld0->mld_n_labels - 1);
+ ((char*)hdr0)[3] = ttl;
+
+ next0 = mld0->mld_dpo.dpoi_next_node;
+ vnet_buffer(b0)->ip.adj_index[VLIB_TX] = mld0->mld_dpo.dpoi_index;
+
+ if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ mpls_label_imposition_trace_t *tr =
+ vlib_add_trace (vm, node, b0, sizeof (*tr));
+ tr->hdr = *hdr0;
+ }
+
+ 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 from_frame->n_vectors;
+}
+
+static u8 *
+format_mpls_label_imposition_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 *);
+ mpls_label_imposition_trace_t * t;
+ mpls_unicast_header_t hdr;
+ uword indent;
+
+ t = va_arg (*args, mpls_label_imposition_trace_t *);
+ indent = format_get_indent (s);
+ hdr.label_exp_s_ttl = clib_net_to_host_u32(t->hdr.label_exp_s_ttl);
+
+ s = format (s, "%Umpls-header:%U",
+ format_white_space, indent,
+ format_mpls_header, hdr);
+ return (s);
+}
+
+static uword
+mpls_label_imposition (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ return (mpls_label_imposition_inline(vm, node, frame, 0, 0));
+}
+
+VLIB_REGISTER_NODE (mpls_label_imposition_node) = {
+ .function = mpls_label_imposition,
+ .name = "mpls-label-imposition",
+ .vector_size = sizeof (u32),
+
+ .format_trace = format_mpls_label_imposition_trace,
+ .n_next_nodes = 1,
+ .next_nodes = {
+ [0] = "error-drop",
+ }
+};
+VLIB_NODE_FUNCTION_MULTIARCH (mpls_label_imposition_node,
+ mpls_label_imposition)
+
+static uword
+ip4_mpls_label_imposition (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ return (mpls_label_imposition_inline(vm, node, frame, 1, 0));
+}
+
+VLIB_REGISTER_NODE (ip4_mpls_label_imposition_node) = {
+ .function = ip4_mpls_label_imposition,
+ .name = "ip4-mpls-label-imposition",
+ .vector_size = sizeof (u32),
+
+ .format_trace = format_mpls_label_imposition_trace,
+ .n_next_nodes = 1,
+ .next_nodes = {
+ [0] = "error-drop",
+ }
+};
+VLIB_NODE_FUNCTION_MULTIARCH (ip4_mpls_label_imposition_node,
+ ip4_mpls_label_imposition)
+
+static uword
+ip6_mpls_label_imposition (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ return (mpls_label_imposition_inline(vm, node, frame, 0, 1));
+}
+
+VLIB_REGISTER_NODE (ip6_mpls_label_imposition_node) = {
+ .function = ip6_mpls_label_imposition,
+ .name = "ip6-mpls-label-imposition",
+ .vector_size = sizeof (u32),
+
+ .format_trace = format_mpls_label_imposition_trace,
+ .n_next_nodes = 1,
+ .next_nodes = {
+ [0] = "error-drop",
+ }
+};
+VLIB_NODE_FUNCTION_MULTIARCH (ip6_mpls_label_imposition_node,
+ ip6_mpls_label_imposition)
+
+static void
+mpls_label_dpo_mem_show (void)
+{
+ fib_show_memory_usage("MPLS label",
+ pool_elts(mpls_label_dpo_pool),
+ pool_len(mpls_label_dpo_pool),
+ sizeof(mpls_label_dpo_t));
+}
+
+const static dpo_vft_t mld_vft = {
+ .dv_lock = mpls_label_dpo_lock,
+ .dv_unlock = mpls_label_dpo_unlock,
+ .dv_format = format_mpls_label_dpo,
+ .dv_mem_show = mpls_label_dpo_mem_show,
+};
+
+const static char* const mpls_label_imp_ip4_nodes[] =
+{
+ "ip4-mpls-label-imposition",
+ NULL,
+};
+const static char* const mpls_label_imp_ip6_nodes[] =
+{
+ "ip6-mpls-label-imposition",
+ NULL,
+};
+const static char* const mpls_label_imp_mpls_nodes[] =
+{
+ "mpls-label-imposition",
+ NULL,
+};
+const static char* const * const mpls_label_imp_nodes[DPO_PROTO_NUM] =
+{
+ [DPO_PROTO_IP4] = mpls_label_imp_ip4_nodes,
+ [DPO_PROTO_IP6] = mpls_label_imp_ip6_nodes,
+ [DPO_PROTO_MPLS] = mpls_label_imp_mpls_nodes,
+};
+
+
+void
+mpls_label_dpo_module_init (void)
+{
+ dpo_register(DPO_MPLS_LABEL, &mld_vft, mpls_label_imp_nodes);
+}
diff --git a/src/vnet/dpo/mpls_label_dpo.h b/src/vnet/dpo/mpls_label_dpo.h
new file mode 100644
index 00000000000..89bcb093b04
--- /dev/null
+++ b/src/vnet/dpo/mpls_label_dpo.h
@@ -0,0 +1,101 @@
+/*
+ * 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.
+ */
+
+#ifndef __MPLS_LABEL_DPO_H__
+#define __MPLS_LABEL_DPO_H__
+
+#include <vnet/vnet.h>
+#include <vnet/mpls/packet.h>
+#include <vnet/dpo/dpo.h>
+
+/**
+ * A representation of an MPLS label for imposition in the data-path
+ */
+typedef struct mpls_label_dpo_t
+{
+ /**
+ * The MPLS label header to impose. Outer most label first.
+ */
+ mpls_unicast_header_t mld_hdr[8];
+
+ /**
+ * Next DPO in the graph
+ */
+ dpo_id_t mld_dpo;
+
+ /**
+ * The protocol of the payload/packets that are being encapped
+ */
+ dpo_proto_t mld_payload_proto;
+
+ /**
+ * Size of the label stack
+ */
+ u16 mld_n_labels;
+
+ /**
+ * Cached amount of header bytes to paint
+ */
+ u16 mld_n_hdr_bytes;
+
+ /**
+ * Number of locks/users of the label
+ */
+ u16 mld_locks;
+} mpls_label_dpo_t;
+
+/**
+ * @brief Assert that the MPLS label object is less than a cache line in size.
+ * Should this get any bigger then we will need to reconsider how many labels
+ * can be pushed in one object.
+ */
+_Static_assert((sizeof(mpls_label_dpo_t) <= CLIB_CACHE_LINE_BYTES),
+ "MPLS label DPO is larger than one cache line.");
+
+/**
+ * @brief Create an MPLS label object
+ *
+ * @param label_stack The stack if labels to impose, outer most label first
+ * @param eos The inner most label's EOS bit
+ * @param ttl The inner most label's TTL bit
+ * @param exp The inner most label's EXP bit
+ * @param payload_proto The ptocool of the payload packets that will
+ * be imposed with this label header.
+ * @param dpo The parent of the created MPLS label object
+ */
+extern index_t mpls_label_dpo_create(mpls_label_t *label_stack,
+ mpls_eos_bit_t eos,
+ u8 ttl,
+ u8 exp,
+ dpo_proto_t payload_proto,
+ const dpo_id_t *dpo);
+
+extern u8* format_mpls_label_dpo(u8 *s, va_list *args);
+
+
+/*
+ * Encapsulation violation for fast data-path access
+ */
+extern mpls_label_dpo_t *mpls_label_dpo_pool;
+
+static inline mpls_label_dpo_t *
+mpls_label_dpo_get (index_t index)
+{
+ return (pool_elt_at_index(mpls_label_dpo_pool, index));
+}
+
+extern void mpls_label_dpo_module_init(void);
+
+#endif
diff --git a/src/vnet/dpo/punt_dpo.c b/src/vnet/dpo/punt_dpo.c
new file mode 100644
index 00000000000..d1661dcc8e0
--- /dev/null
+++ b/src/vnet/dpo/punt_dpo.c
@@ -0,0 +1,100 @@
+/*
+ * 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.
+ */
+/**
+ * @brief
+ * The data-path object representing puntping the packet
+ */
+
+#include <vnet/dpo/dpo.h>
+
+static dpo_id_t punt_dpos[DPO_PROTO_NUM];
+
+const dpo_id_t *
+punt_dpo_get (dpo_proto_t proto)
+{
+ dpo_set(&punt_dpos[proto], DPO_PUNT, proto, 1);
+
+ return (&punt_dpos[proto]);
+}
+
+int
+dpo_is_punt (const dpo_id_t *dpo)
+{
+ return (dpo->dpoi_type == DPO_PUNT);
+}
+
+static void
+punt_dpo_lock (dpo_id_t *dpo)
+{
+ /*
+ * not maintaining a lock count on the punt
+ * more trouble than it's worth.
+ * There always needs to be one around. no point it managaing its lifetime
+ */
+}
+static void
+punt_dpo_unlock (dpo_id_t *dpo)
+{
+}
+
+static u8*
+format_punt_dpo (u8 *s, va_list *ap)
+{
+ CLIB_UNUSED(index_t index) = va_arg(*ap, index_t);
+ CLIB_UNUSED(u32 indent) = va_arg(*ap, u32);
+
+ return (format(s, "dpo-punt"));
+}
+
+const static dpo_vft_t punt_vft = {
+ .dv_lock = punt_dpo_lock,
+ .dv_unlock = punt_dpo_unlock,
+ .dv_format = format_punt_dpo,
+};
+
+/**
+ * @brief The per-protocol VLIB graph nodes that are assigned to a punt
+ * object.
+ *
+ * this means that these graph nodes are ones from which a punt is the
+ * parent object in the DPO-graph.
+ */
+const static char* const punt_ip4_nodes[] =
+{
+ "ip4-punt",
+ NULL,
+};
+const static char* const punt_ip6_nodes[] =
+{
+ "ip6-punt",
+ NULL,
+};
+const static char* const punt_mpls_nodes[] =
+{
+ "mpls-punt",
+ NULL,
+};
+const static char* const * const punt_nodes[DPO_PROTO_NUM] =
+{
+ [DPO_PROTO_IP4] = punt_ip4_nodes,
+ [DPO_PROTO_IP6] = punt_ip6_nodes,
+ [DPO_PROTO_MPLS] = punt_mpls_nodes,
+};
+
+void
+punt_dpo_module_init (void)
+{
+ dpo_register(DPO_PUNT, &punt_vft, punt_nodes);
+}
diff --git a/src/vnet/dpo/punt_dpo.h b/src/vnet/dpo/punt_dpo.h
new file mode 100644
index 00000000000..370547c1596
--- /dev/null
+++ b/src/vnet/dpo/punt_dpo.h
@@ -0,0 +1,30 @@
+/*
+ * 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.
+ */
+/**
+ * @brief A DPO to punt packets to the Control-plane
+ */
+
+#ifndef __PUNT_DPO_H__
+#define __PUNT_DPO_H__
+
+#include <vnet/dpo/dpo.h>
+
+extern int dpo_is_punt(const dpo_id_t *dpo);
+
+extern const dpo_id_t *punt_dpo_get(dpo_proto_t proto);
+
+extern void punt_dpo_module_init(void);
+
+#endif
diff --git a/src/vnet/dpo/receive_dpo.c b/src/vnet/dpo/receive_dpo.c
new file mode 100644
index 00000000000..2b2571c6c83
--- /dev/null
+++ b/src/vnet/dpo/receive_dpo.c
@@ -0,0 +1,165 @@
+/*
+ * 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.
+ */
+/**
+ * @brief
+ * The data-path object representing receiveing the packet, i.e. it's for-us
+ */
+#include <vlib/vlib.h>
+#include <vnet/ip/ip.h>
+#include <vnet/dpo/receive_dpo.h>
+
+/**
+ * @brief pool of all receive DPOs
+ */
+receive_dpo_t *receive_dpo_pool;
+
+static receive_dpo_t *
+receive_dpo_alloc (void)
+{
+ receive_dpo_t *rd;
+
+ pool_get_aligned(receive_dpo_pool, rd, CLIB_CACHE_LINE_BYTES);
+ memset(rd, 0, sizeof(*rd));
+
+ return (rd);
+}
+
+static receive_dpo_t *
+receive_dpo_get_from_dpo (const dpo_id_t *dpo)
+{
+ ASSERT(DPO_RECEIVE == dpo->dpoi_type);
+
+ return (receive_dpo_get(dpo->dpoi_index));
+}
+
+
+/*
+ * receive_dpo_add_or_lock
+ *
+ * The next_hop address here is used for source address selection in the DP.
+ * The local adj is added to an interface's receive prefix, the next-hop
+ * passed here is the local prefix on the same interface.
+ */
+void
+receive_dpo_add_or_lock (dpo_proto_t proto,
+ u32 sw_if_index,
+ const ip46_address_t *nh_addr,
+ dpo_id_t *dpo)
+{
+ receive_dpo_t *rd;
+
+ rd = receive_dpo_alloc();
+
+ rd->rd_sw_if_index = sw_if_index;
+ if (NULL != nh_addr)
+ {
+ rd->rd_addr = *nh_addr;
+ }
+
+ dpo_set(dpo, DPO_RECEIVE, proto, (rd - receive_dpo_pool));
+}
+
+static void
+receive_dpo_lock (dpo_id_t *dpo)
+{
+ receive_dpo_t *rd;
+
+ rd = receive_dpo_get_from_dpo(dpo);
+ rd->rd_locks++;
+}
+
+static void
+receive_dpo_unlock (dpo_id_t *dpo)
+{
+ receive_dpo_t *rd;
+
+ rd = receive_dpo_get_from_dpo(dpo);
+ rd->rd_locks--;
+
+ if (0 == rd->rd_locks)
+ {
+ pool_put(receive_dpo_pool, rd);
+ }
+}
+
+static u8*
+format_receive_dpo (u8 *s, va_list *ap)
+{
+ CLIB_UNUSED(index_t index) = va_arg(*ap, index_t);
+ CLIB_UNUSED(u32 indent) = va_arg(*ap, u32);
+ vnet_main_t * vnm = vnet_get_main();
+ receive_dpo_t *rd;
+
+ rd = receive_dpo_get(index);
+
+ if (~0 != rd->rd_sw_if_index)
+ {
+ return (format(s, "dpo-receive: %U on %U",
+ format_ip46_address, &rd->rd_addr, IP46_TYPE_ANY,
+ format_vnet_sw_interface_name, vnm,
+ vnet_get_sw_interface(vnm, rd->rd_sw_if_index)));
+ }
+ else
+ {
+ return (format(s, "dpo-receive"));
+ }
+}
+
+static void
+receive_dpo_mem_show (void)
+{
+ fib_show_memory_usage("Receive",
+ pool_elts(receive_dpo_pool),
+ pool_len(receive_dpo_pool),
+ sizeof(receive_dpo_t));
+}
+
+const static dpo_vft_t receive_vft = {
+ .dv_lock = receive_dpo_lock,
+ .dv_unlock = receive_dpo_unlock,
+ .dv_format = format_receive_dpo,
+ .dv_mem_show = receive_dpo_mem_show,
+};
+
+/**
+ * @brief The per-protocol VLIB graph nodes that are assigned to a receive
+ * object.
+ *
+ * this means that these graph nodes are ones from which a receive is the
+ * parent object in the DPO-graph.
+ */
+const static char* const receive_ip4_nodes[] =
+{
+ "ip4-local",
+ NULL,
+};
+const static char* const receive_ip6_nodes[] =
+{
+ "ip6-local",
+ NULL,
+};
+
+const static char* const * const receive_nodes[DPO_PROTO_NUM] =
+{
+ [DPO_PROTO_IP4] = receive_ip4_nodes,
+ [DPO_PROTO_IP6] = receive_ip6_nodes,
+ [DPO_PROTO_MPLS] = NULL,
+};
+
+void
+receive_dpo_module_init (void)
+{
+ dpo_register(DPO_RECEIVE, &receive_vft, receive_nodes);
+}
diff --git a/src/vnet/dpo/receive_dpo.h b/src/vnet/dpo/receive_dpo.h
new file mode 100644
index 00000000000..2420fd7843c
--- /dev/null
+++ b/src/vnet/dpo/receive_dpo.h
@@ -0,0 +1,62 @@
+/*
+ * 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.
+ */
+/**
+ * @brief
+ * The data-path object representing receiveing the packet, i.e. it's for-us
+ */
+
+#ifndef __RECEIVE_DPO_H__
+#define __RECEIVE_DPO_H__
+
+#include <vnet/dpo/dpo.h>
+#include <vnet/ip/ip6.h>
+
+typedef struct receive_dpo_t_
+{
+ /**
+ * The Software interface index on which traffic is received
+ */
+ u32 rd_sw_if_index;
+
+ /**
+ * The address on the receive interface. packet are destined to this address
+ */
+ ip46_address_t rd_addr;
+
+ /**
+ * number oflocks.
+ */
+ u16 rd_locks;
+} receive_dpo_t;
+
+extern void receive_dpo_add_or_lock (dpo_proto_t proto,
+ u32 sw_if_index,
+ const ip46_address_t *nh_addr,
+ dpo_id_t *dpo);
+
+extern void receive_dpo_module_init(void);
+
+/**
+ * @brief pool of all receive DPOs
+ */
+receive_dpo_t *receive_dpo_pool;
+
+static inline receive_dpo_t *
+receive_dpo_get (index_t index)
+{
+ return (pool_elt_at_index(receive_dpo_pool, index));
+}
+
+#endif