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+/*
+ * 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