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cfm: Implement 802.1ag RDI flag.

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According to the 802.1ag specification, a maintenance point should
set the Remote Defect Indicator (RDI) bit on CCMs when it has
failed to receive a CCM from any of it's configured remote
maintenance points within the required fault interval.  This allows
unidirectional faults to be flagged by both ends of a CFM monitored
tunnel.
This commit is contained in:
Ethan Jackson
2011-05-17 16:07:58 -07:00
parent c0a2e71d11
commit aa62994cbd
1 changed files with 24 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

32
lib/cfm.c
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@@ -47,6 +47,7 @@ static const uint8_t eth_addr_ccm[6] = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x30 };
#define CCM_LEN 74
#define CCM_MAID_LEN 48
#define CCM_OPCODE 1 /* CFM message opcode meaning CCM. */
#define CCM_RDI_MASK 0x80
struct ccm {
uint8_t mdlevel_version; /* MD Level and Version */
uint8_t opcode;
@@ -64,6 +65,7 @@ struct cfm {
struct list list_node; /* Node in all_cfms list. */
bool fault; /* Indicates connectivity fault. */
bool recv_fault; /* Indicates an inability to receive CCMs. */
char *name; /* Name of this CFM object. */
uint32_t seq; /* The sequence number of our last CCM. */
@@ -85,6 +87,8 @@ struct remote_mp {
bool recv; /* CCM was received since last fault check. */
bool fault; /* Indicates a connectivity fault. */
bool rdi; /* Remote Defect Indicator. Indicates remote_mp isn't
receiving CCMs that it's expecting to. */
};
static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(5, 20);
@@ -236,24 +240,29 @@ cfm_destroy(struct cfm *cfm)
void
cfm_run(struct cfm *cfm)
{
if (timer_expired(&cfm->fault_timer)) {
long long int interval = cfm_fault_interval(cfm);
struct remote_mp *rmp;
cfm->fault = false;
cfm->recv_fault = false;
HMAP_FOR_EACH (rmp, node, &cfm->remote_mps) {
rmp->fault = !rmp->recv;
rmp->recv = false;
if (rmp->fault) {
cfm->fault = true;
cfm->recv_fault = true;
VLOG_DBG("No CCM from RMP %"PRIu16" in the last %lldms",
rmp->mpid, interval);
} else if (rmp->rdi) {
cfm->fault = true;
VLOG_DBG("RDI bit flagged from RMP %"PRIu16, rmp->mpid);
}
}
if (!cfm->fault) {
if (cfm->recv_fault) {
cfm->fault = true;
} else {
VLOG_DBG("All RMPs received CCMs in the last %lldms", interval);
}
@@ -266,7 +275,6 @@ cfm_run(struct cfm *cfm)
bool
cfm_should_send_ccm(struct cfm *cfm)
{
return timer_expired(&cfm->tx_timer);
}
@@ -289,6 +297,10 @@ cfm_compose_ccm(struct cfm *cfm, struct ofpbuf *packet,
ccm->mpid = htons(cfm->mpid);
ccm->flags = cfm->ccm_interval;
memcpy(ccm->maid, cfm->maid, sizeof ccm->maid);
if (cfm->recv_fault) {
ccm->flags |= CCM_RDI_MASK;
}
}
void
@@ -373,6 +385,7 @@ void
cfm_process_heartbeat(struct cfm *cfm, const struct ofpbuf *p)
{
struct ccm *ccm;
bool ccm_rdi;
uint16_t ccm_mpid;
uint8_t ccm_interval;
struct remote_mp *rmp;
@@ -407,11 +420,13 @@ cfm_process_heartbeat(struct cfm *cfm, const struct ofpbuf *p)
} else {
ccm_mpid = ntohs(ccm->mpid);
ccm_interval = ccm->flags & 0x7;
ccm_rdi = ccm->flags & CCM_RDI_MASK;
rmp = lookup_remote_mp(&cfm->remote_mps, ccm_mpid);
if (rmp) {
rmp->recv = true;
rmp->rdi = ccm_rdi;
if (ccm_interval != cfm->ccm_interval) {
VLOG_WARN_RL(&rl, "received a CCM with an invalid interval"
@@ -423,8 +438,8 @@ cfm_process_heartbeat(struct cfm *cfm, const struct ofpbuf *p)
ETH_ADDR_FMT, ccm_mpid, ETH_ADDR_ARGS(eth->eth_src));
}
VLOG_DBG("Received CCM (mpid %"PRIu16") (interval %"PRIu8")", ccm_mpid,
ccm_interval);
VLOG_DBG("Received CCM (mpid %"PRIu16") (interval %"PRIu8") (RDI %s)",
ccm_mpid, ccm_interval, ccm_rdi ? "true" : "false");
}
}
@@ -463,8 +478,9 @@ cfm_unixctl_show(struct unixctl_conn *conn,
return;
}
ds_put_format(&ds, "MPID %"PRIu16": %s\n", cfm->mpid,
cfm->fault ? "fault" : "");
ds_put_format(&ds, "MPID %"PRIu16":%s%s\n", cfm->mpid,
cfm->fault ? " fault" : "",
cfm->recv_fault ? " recv_fault" : "");
ds_put_format(&ds, "\tinterval: %dms\n", cfm->ccm_interval_ms);
ds_put_format(&ds, "\tnext CCM tx: %lldms\n",