lib/bond.h

   1 /*
   2  * Copyright (c) 2008, 2009, 2010, 2011 Nicira, Inc.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at:
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 #ifndef BOND_H
  18 #define BOND_H 1
  19
  20 #include <stdbool.h>
  21 #include <stdint.h>
  22
  23 #include "packets.h"
  24 #include "tag.h"
  25
  26 struct flow;
  27 struct netdev;
  28 struct ofpbuf;
  29 enum lacp_status;
  30
  31 /* How flows are balanced among bond slaves. */
  32 enum bond_mode {
  33     BM_TCP, /* Transport Layer Load Balance. */
  34     BM_SLB, /* Source Load Balance. */
  35     BM_AB   /* Active Backup. */
  36 };
  37
  38 bool bond_mode_from_string(enum bond_mode *, const char *);
  39 const char *bond_mode_to_string(enum bond_mode);
  40
  41 /* Configuration for a bond as a whole. */
  42 struct bond_settings {
  43     char *name;                 /* Bond's name, for log messages. */
  44     uint32_t basis;             /* Flow hashing basis. */
  45
  46     /* Balancing configuration. */
  47     enum bond_mode balance;
  48     int rebalance_interval;     /* Milliseconds between rebalances.
  49                                    Zero to disable rebalancing. */
  50
  51     /* Link status detection. */
  52     int up_delay;               /* ms before enabling an up slave. */
  53     int down_delay;             /* ms before disabling a down slave. */
  54
  55     /* Legacy compatibility. */
  56     bool fake_iface;            /* Update fake stats for netdev 'name'? */
  57 };
  58
  59 /* Program startup. */
  60 void bond_init(void);
  61
  62 /* Basics. */
  63 struct bond *bond_create(const struct bond_settings *);
  64 void bond_destroy(struct bond *);
  65
  66 bool bond_reconfigure(struct bond *, const struct bond_settings *);
  67 void bond_slave_register(struct bond *, void *slave_, struct netdev *);
  68 void bond_slave_set_netdev(struct bond *, void *slave_, struct netdev *);
  69 void bond_slave_unregister(struct bond *, const void *slave);
  70
  71 void bond_run(struct bond *, struct tag_set *, enum lacp_status);
  72 void bond_wait(struct bond *);
  73
  74 void bond_slave_set_may_enable(struct bond *, void *slave_, bool may_enable);
  75
  76 /* Special MAC learning support for SLB bonding. */
  77 bool bond_should_send_learning_packets(struct bond *);
  78 struct ofpbuf *bond_compose_learning_packet(struct bond *,
  79                                             const uint8_t eth_src[ETH_ADDR_LEN],
  80                                             uint16_t vlan, void **port_aux);
  81
  82 /* Packet processing. */
  83 enum bond_verdict {
  84     BV_ACCEPT,                  /* Accept this packet. */
  85     BV_DROP,                    /* Drop this packet. */
  86     BV_DROP_IF_MOVED            /* Drop if we've learned a different port. */
  87 };
  88 enum bond_verdict bond_check_admissibility(struct bond *, const void *slave_,
  89                                            const uint8_t eth_dst[ETH_ADDR_LEN],
  90                                            tag_type *);
  91 void *bond_choose_output_slave(struct bond *, const struct flow *,
  92                                struct flow_wildcards *, uint16_t vlan,
  93                                tag_type *);
  94
  95 /* Rebalancing. */
  96 void bond_account(struct bond *, const struct flow *, uint16_t vlan,
  97                   uint64_t n_bytes);
  98 void bond_rebalance(struct bond *, struct tag_set *);
  99
 100 #endif /* bond.h */