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Diffstat (limited to 'src/vnet/dpo/load_balance.h')
| -rw-r--r-- | src/vnet/dpo/load_balance.h | 219 |
1 files changed, 219 insertions, 0 deletions
diff --git a/src/vnet/dpo/load_balance.h b/src/vnet/dpo/load_balance.h new file mode 100644 index 00000000..b901c5be --- /dev/null +++ b/src/vnet/dpo/load_balance.h @@ -0,0 +1,219 @@ +/* + * 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> +#include <vnet/fib/fib_entry.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; + + /** + * Flags from the load-balance's associated fib_entry_t + */ + fib_entry_flag_t lb_fib_entry_flags; + + /** + * 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, + const 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 void load_balance_set_fib_entry_flags(index_t lbi, + fib_entry_flag_t flags); +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 |