recomputed. */
long long int last_tx; /* Last CCM transmission time. */
+ /* These bools are atomic to allow readers to check their values
+ * without taking 'mutex'. Such readers do not assume the values they
+ * read are synchronized with any other members. */
atomic_bool check_tnl_key; /* Verify the tunnel key of inbound packets? */
atomic_bool extended; /* Extended mode. */
struct ovs_refcount ref_cnt;
cfm_ccm_addr(struct cfm *cfm)
{
bool extended;
- atomic_read(&cfm->extended, &extended);
+
+ atomic_read_relaxed(&cfm->extended, &extended);
+
return extended ? eth_addr_ccm_x : eth_addr_ccm;
}
return;
}
- if (ovs_refcount_unref(&cfm->ref_cnt) != 1) {
+ if (ovs_refcount_unref_relaxed(&cfm->ref_cnt) != 1) {
return;
}
eth_push_vlan(packet, htons(ETH_TYPE_VLAN), htons(tci));
}
+ atomic_read_relaxed(&cfm->extended, &extended);
+
ccm = ofpbuf_l3(packet);
ccm->mdlevel_version = 0;
ccm->opcode = CCM_OPCODE;
memset(ccm->zero, 0, sizeof ccm->zero);
ccm->end_tlv = 0;
- atomic_read(&cfm->extended, &extended);
if (extended) {
ccm->mpid = htons(hash_mpid(cfm->mpid));
ccm->mpid64 = htonll(cfm->mpid);
if (cfm->last_tx) {
long long int delay = time_msec() - cfm->last_tx;
if (delay > (cfm->ccm_interval_ms * 3 / 2)) {
- VLOG_WARN("%s: long delay of %lldms (expected %dms) sending CCM"
+ VLOG_INFO("%s: long delay of %lldms (expected %dms) sending CCM"
" seq %"PRIu32, cfm->name, delay, cfm->ccm_interval_ms,
cfm->seq);
}
interval = ms_to_ccm_interval(s->interval);
interval_ms = ccm_interval_to_ms(interval);
- atomic_store(&cfm->check_tnl_key, s->check_tnl_key);
- atomic_store(&cfm->extended, s->extended);
+ atomic_store_relaxed(&cfm->check_tnl_key, s->check_tnl_key);
+ atomic_store_relaxed(&cfm->extended, s->extended);
cfm->ccm_vlan = s->ccm_vlan;
cfm->ccm_pcp = s->ccm_pcp & (VLAN_PCP_MASK >> VLAN_PCP_SHIFT);
struct cfm *cfm = CONST_CAST(struct cfm *, cfm_);
bool check_tnl_key;
- atomic_read(&cfm->check_tnl_key, &check_tnl_key);
+ /* Most packets are not CFM. */
+ if (OVS_LIKELY(flow->dl_type != htons(ETH_TYPE_CFM))) {
+ return false;
+ }
+
memset(&wc->masks.dl_dst, 0xff, sizeof wc->masks.dl_dst);
+ if (OVS_UNLIKELY(!eth_addr_equals(flow->dl_dst, cfm_ccm_addr(cfm)))) {
+ return false;
+ }
+
+ atomic_read_relaxed(&cfm->check_tnl_key, &check_tnl_key);
+
if (check_tnl_key) {
memset(&wc->masks.tunnel.tun_id, 0xff, sizeof wc->masks.tunnel.tun_id);
+ return flow->tunnel.tun_id == htonll(0);
}
- return (ntohs(flow->dl_type) == ETH_TYPE_CFM
- && eth_addr_equals(flow->dl_dst, cfm_ccm_addr(cfm))
- && (!check_tnl_key || flow->tunnel.tun_id == htonll(0)));
+ return true;
}
/* Updates internal statistics relevant to packet 'p'. Should be called on
{
struct ccm *ccm;
struct eth_header *eth;
+ bool extended;
ovs_mutex_lock(&mutex);
+ atomic_read_relaxed(&cfm->extended, &extended);
+
eth = ofpbuf_l2(p);
ccm = ofpbuf_at(p, (uint8_t *)ofpbuf_l3(p) - (uint8_t *)ofpbuf_data(p),
CCM_ACCEPT_LEN);
uint64_t ccm_mpid;
uint32_t ccm_seq;
bool ccm_opdown;
- bool extended;
enum cfm_fault_reason cfm_fault = 0;
- atomic_read(&cfm->extended, &extended);
if (extended) {
ccm_mpid = ntohll(ccm->mpid64);
ccm_opdown = ccm->opdown;
struct cfm *cfm = CONST_CAST(struct cfm *, cfm_);
bool extended;
- atomic_read(&cfm->extended, &extended);
+ atomic_read_relaxed(&cfm->extended, &extended);
return extended ? cfm->remote_opup : -1;
}
bool extended;
int fault;
- atomic_read(&cfm->extended, &extended);
+ atomic_read_relaxed(&cfm->extended, &extended);
ds_put_format(ds, "---- %s ----\n", cfm->name);
ds_put_format(ds, "MPID %"PRIu64":%s%s\n", cfm->mpid,