lib/cfm.h

   1 /* Copyright (c) 2010, 2011, 2015 Nicira, Inc.
   2  *
   3  * Licensed under the Apache License, Version 2.0 (the "License");
   4  * you may not use this file except in compliance with the License.
   5  * You may obtain a copy of the License at:
   6  *
   7  *     http://www.apache.org/licenses/LICENSE-2.0
   8  *
   9  * Unless required by applicable law or agreed to in writing, software
  10  * distributed under the License is distributed on an "AS IS" BASIS,
  11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12  * See the License for the specific language governing permissions and
  13  * limitations under the License.
  14  */
  15
  16 #ifndef CFM_H
  17 #define CFM_H 1
  18
  19 #include <stdint.h>
  20
  21 #include "openvswitch/hmap.h"
  22 #include "openvswitch/types.h"
  23 #include "packets.h"
  24
  25 struct flow;
  26 struct dp_packet;
  27 struct netdev;
  28 struct flow_wildcards;
  29
  30 #define CFM_RANDOM_VLAN UINT16_MAX
  31
  32 #define CFM_FAULT_REASONS                  \
  33     CFM_FAULT_REASON(RECV, recv)           \
  34     CFM_FAULT_REASON(RDI, rdi)             \
  35     CFM_FAULT_REASON(MAID, maid)           \
  36     CFM_FAULT_REASON(LOOPBACK, loopback)   \
  37     CFM_FAULT_REASON(OVERFLOW, overflow)   \
  38     CFM_FAULT_REASON(OVERRIDE, override)
  39
  40 enum cfm_fault_bit_index {
  41 #define CFM_FAULT_REASON(NAME, STR) CFM_FAULT_INDEX_##NAME,
  42     CFM_FAULT_REASONS
  43 #undef CFM_FAULT_REASON
  44     CFM_FAULT_N_REASONS
  45 };
  46
  47 enum cfm_fault_reason {
  48 #define CFM_FAULT_REASON(NAME, STR) \
  49     CFM_FAULT_##NAME = 1 << CFM_FAULT_INDEX_##NAME,
  50     CFM_FAULT_REASONS
  51 #undef CFM_FAULT_REASON
  52 };
  53
  54 struct cfm_settings {
  55     uint64_t mpid;              /* The MPID of this CFM. */
  56     int interval;               /* The requested transmission interval. */
  57     bool extended;              /* Run in extended mode. */
  58     bool demand;                /* Run in demand mode. */
  59     bool opup;                  /* Operational State. */
  60     uint16_t ccm_vlan;          /* CCM Vlan tag. Zero if none.
  61                                    CFM_RANDOM_VLAN if random. */
  62     uint8_t ccm_pcp;            /* CCM Priority. Zero if none. */
  63
  64     bool check_tnl_key;         /* Verify inbound packet key? */
  65 };
  66
  67 /* CFM status query. */
  68 struct cfm_status {
  69     /* 0 if not faulted, otherwise a combination of one or more reasons. */
  70     enum cfm_fault_reason faults;
  71
  72     /* 0 if the remote CFM endpoint is operationally down,
  73      * 1 if the remote CFM endpoint is operationally up,
  74      * -1 if we don't know because the remote CFM endpoint is not in extended
  75      * mode. */
  76     int remote_opstate;
  77
  78     uint64_t flap_count;
  79
  80     /* Ordinarily a "health status" in the range 0...100 inclusive, with 0
  81      * being worst and 100 being best, or -1 if the health status is not
  82      * well-defined. */
  83     int health;
  84
  85     /* MPIDs of remote maintenance points whose CCMs have been received. */
  86     uint64_t *rmps;
  87     size_t n_rmps;
  88 };
  89
  90 void cfm_init(void);
  91 struct cfm *cfm_create(const struct netdev *);
  92 struct cfm *cfm_ref(const struct cfm *);
  93 void cfm_unref(struct cfm *);
  94 void cfm_run(struct cfm *);
  95 bool cfm_should_send_ccm(struct cfm *);
  96 void cfm_compose_ccm(struct cfm *, struct dp_packet *,
  97                      const struct eth_addr eth_src);
  98 long long int cfm_wait(struct cfm *);
  99 bool cfm_configure(struct cfm *, const struct cfm_settings *);
 100 void cfm_set_netdev(struct cfm *, const struct netdev *);
 101 bool cfm_should_process_flow(const struct cfm *cfm, const struct flow *,
 102                              struct flow_wildcards *);
 103 void cfm_process_heartbeat(struct cfm *, const struct dp_packet *packet);
 104 bool cfm_check_status_change(struct cfm *);
 105 int cfm_get_fault(const struct cfm *);
 106 uint64_t cfm_get_flap_count(const struct cfm *);
 107 int cfm_get_health(const struct cfm *);
 108 int cfm_get_opup(const struct cfm *);
 109 void cfm_get_remote_mpids(const struct cfm *, uint64_t **rmps, size_t *n_rmps);
 110 void cfm_get_status(const struct cfm *, struct cfm_status *);
 111 const char *cfm_fault_reason_to_str(int fault);
 112
 113 long long int cfm_wake_time(struct cfm*);
 114 #endif /* cfm.h */