lib/bond.h

   1 /*
   2  * Copyright (c) 2008, 2009, 2010, 2011 Nicira Networks.
   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
  30 /* How flows are balanced among bond slaves. */
  31 enum bond_mode {
  32     BM_TCP, /* Transport Layer Load Balance. */
  33     BM_SLB, /* Source Load Balance. */
  34     BM_STABLE, /* Stable. */
  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 /* How to detect link status. */
  42 enum bond_detect_mode {
  43     BLSM_CARRIER,               /* Use carrier. */
  44     BLSM_MIIMON                 /* Poll MII status. */
  45 };
  46
  47 bool bond_detect_mode_from_string(enum bond_detect_mode *, const char *);
  48 const char *bond_detect_mode_to_string(enum bond_detect_mode);
  49
  50 /* Configuration for a bond as a whole. */
  51 struct bond_settings {
  52     char *name;                 /* Bond's name, for log messages. */
  53     uint32_t basis;             /* Flow hashing basis. */
  54
  55     /* Balancing configuration. */
  56     enum bond_mode balance;
  57     int rebalance_interval;     /* Milliseconds between rebalances. */
  58
  59     /* Link status detection. */
  60     enum bond_detect_mode detect; /* BLSM_CARRIER or BLSM_MIIMON. */
  61     int miimon_interval;        /* Used only for BLSM_MIIMON. */
  62     int up_delay;               /* ms before enabling an up slave. */
  63     int down_delay;             /* ms before disabling a down slave. */
  64
  65     /* Legacy compatibility. */
  66     bool fake_iface;            /* Update fake stats for netdev 'name'? */
  67 };
  68
  69 /* Program startup. */
  70 void bond_init(void);
  71
  72 /* Basics. */
  73 struct bond *bond_create(const struct bond_settings *);
  74 void bond_destroy(struct bond *);
  75
  76 bool bond_reconfigure(struct bond *, const struct bond_settings *);
  77 void bond_slave_register(struct bond *, void *slave_,
  78                          uint16_t stable_id, struct netdev *);
  79 void bond_slave_unregister(struct bond *, const void *slave);
  80
  81 void bond_run(struct bond *, struct tag_set *, bool lacp_negotiated);
  82 void bond_wait(struct bond *);
  83
  84 /* LACP. */
  85 void bond_slave_set_lacp_may_enable(struct bond *, void *slave_,
  86                                     bool may_enable);
  87
  88 /* Special MAC learning support for SLB bonding. */
  89 bool bond_should_send_learning_packets(struct bond *);
  90 int bond_send_learning_packet(struct bond *,
  91                               const uint8_t eth_src[ETH_ADDR_LEN],
  92                               uint16_t vlan);
  93
  94 /* Packet processing. */
  95 enum bond_verdict {
  96     BV_ACCEPT,                  /* Accept this packet. */
  97     BV_DROP,                    /* Drop this packet. */
  98     BV_DROP_IF_MOVED            /* Drop if we've learned a different port. */
  99 };
 100 enum bond_verdict bond_check_admissibility(struct bond *, const void *slave_,
 101                                            const uint8_t eth_dst[ETH_ADDR_LEN],
 102                                            tag_type *);
 103 void *bond_choose_output_slave(struct bond *,
 104                                const struct flow *, uint16_t vlan, tag_type *);
 105
 106 /* Rebalancing. */
 107 void bond_account(struct bond *, const struct flow *, uint16_t vlan,
 108                   uint64_t n_bytes);
 109 void bond_rebalance(struct bond *, struct tag_set *);
 110
 111 #endif /* bond.h */