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/*
* Copyright (c) 2022 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifdef WITH_POLICY_STATS
// This has to be included first because of _GNU_SOURCE
#include <hicn/core/forwarder.h>
#include <hicn/core/connection_table.h>
#include <hicn/base/loop.h>
#include <hicn/util/log.h>
#include <hicn/core/ticks.h>
#include <hicn/policy.h>
#include <hicn/core/fib.h>
#include "policy_stats.h"
#define ALPHA 0.9
#define STATS_INTERVAL 1000 /* ms */
static int policy_stats_mgr_tick(void* mgr_arg, int fd, unsigned id,
void* data) {
policy_stats_mgr_t* mgr = mgr_arg;
assert(mgr);
assert(id == 0);
assert(!data);
uint64_t now = ticks_now();
/* Loop over FIB entries to compute statistics from counters */
const fib_t* fib = forwarder_get_fib(mgr->forwarder);
fib_foreach_entry(fib, entry, {
policy_stats_update(&entry->policy_stats, &entry->policy_counters, now);
});
return 0;
}
int policy_stats_mgr_initialize(policy_stats_mgr_t* mgr, void* forwarder) {
mgr->forwarder = forwarder;
loop_timer_create(&mgr->timer, MAIN_LOOP, mgr, policy_stats_mgr_tick, NULL);
if (!mgr->timer) {
ERROR("Error allocating prefix stats mgr timer.");
return -1;
}
if (loop_timer_register(mgr->timer, STATS_INTERVAL) < 0) {
ERROR("Error registering prefix stats mgr timer.");
return -1;
}
return 0;
}
void policy_stats_mgr_finalize(policy_stats_mgr_t* mgr) {
loop_event_unregister(mgr->timer);
loop_event_free(mgr->timer);
}
void policy_stats_on_retransmission(const policy_stats_mgr_t* mgr,
policy_counters_t* counters,
const nexthops_t* nexthops) {
connection_table_t* table = forwarder_get_connection_table(mgr->forwarder);
nexthops_foreach(nexthops, nexthop, {
#ifdef WITH_POLICY
const connection_t* conn = connection_table_at(table, nexthop);
if (connection_has_tag(conn, POLICY_TAG_WIRED))
counters->wired.num_losses++;
if (connection_has_tag(conn, POLICY_TAG_WIFI)) counters->wifi.num_losses++;
if (connection_has_tag(conn, POLICY_TAG_CELLULAR))
counters->cellular.num_losses++;
#endif /* WITH_POLICY */
counters->all.num_losses++;
});
}
#define UPDATE_TAG_STATS(TAG, NAME) \
do { \
if (connection_has_tag(conn, TAG)) { \
counters->NAME.num_packets++; \
counters->NAME.num_bytes += msg_size; \
stats->NAME.latency = \
ALPHA * stats->NAME.latency + (1 - ALPHA) * (double)rtt; \
counters->NAME.latency_idle = 0; \
} \
} while (0)
/* Update statistic counters upon Data packet reception */
void policy_stats_on_data(const policy_stats_mgr_t* mgr, policy_stats_t* stats,
policy_counters_t* counters,
const nexthops_t* nexthops, const msgbuf_t* msgbuf,
Ticks rtt) {
#ifdef WITH_POLICY
forwarder_t* forwarder = mgr->forwarder;
connection_table_t* table = forwarder_get_connection_table(forwarder);
#endif /* WITH_POLICY */
size_t msg_size = msgbuf_get_len(msgbuf);
nexthops_foreach(nexthops, nexthop, {
#ifdef WITH_POLICY
const connection_t* conn = connection_table_at(table, nexthop);
if (!conn) continue;
UPDATE_TAG_STATS(POLICY_TAG_WIRED, wired);
UPDATE_TAG_STATS(POLICY_TAG_WIFI, wifi);
UPDATE_TAG_STATS(POLICY_TAG_CELLULAR, cellular);
#endif /* WITH_POLICY */
});
stats->all.latency = ALPHA * stats->all.latency + (1 - ALPHA) * (double)rtt;
counters->all.latency_idle = 0;
counters->all.num_packets++;
counters->all.num_bytes += msg_size;
}
void policy_stats_on_timeout(const policy_stats_mgr_t* mgr,
policy_counters_t* counters,
const nexthops_t* nexthops) {
#ifdef WITH_POLICY
connection_table_t* table = forwarder_get_connection_table(mgr->forwarder);
nexthops_foreach(nexthops, nexthop, {
const connection_t* conn = connection_table_at(table, nexthop);
if (!conn) continue;
if (connection_has_tag(conn, POLICY_TAG_WIRED))
counters->wired.num_losses++;
if (connection_has_tag(conn, POLICY_TAG_WIFI)) counters->wifi.num_losses++;
if (connection_has_tag(conn, POLICY_TAG_CELLULAR))
counters->cellular.num_losses++;
});
#endif /* WITH_POLICY */
counters->all.num_losses++;
}
#define UPDATE_TYPE(TYPE) \
do { \
/* (a) throughput */ \
if (counters->TYPE.num_bytes > 0) { \
throughput = counters->TYPE.num_bytes / (now - counters->last_update); \
throughput = throughput * 8 / 1024; \
if (throughput < 0) throughput = 0; \
} else { \
throughput = 0; \
} \
stats->TYPE.throughput = \
ALPHA * stats->TYPE.throughput + (1 - ALPHA) * throughput; \
\
/* (b) loss rate */ \
if ((counters->TYPE.num_losses > 0) && (counters->TYPE.num_packets > 0)) { \
loss_rate = counters->TYPE.num_losses / counters->TYPE.num_packets; \
loss_rate *= 100; \
} else { \
loss_rate = 0; \
} \
stats->TYPE.loss_rate = \
ALPHA * stats->TYPE.loss_rate + (1 - ALPHA) * loss_rate; \
\
/* (c) latency */ \
counters->TYPE.latency_idle++; \
if (counters->TYPE.latency_idle > 1) stats->TYPE.latency = 0; \
\
/* (d) Reset counters */ \
counters->TYPE.num_bytes = 0; \
counters->TYPE.num_losses = 0; \
counters->TYPE.num_packets = 0; \
} while (0)
void policy_stats_update(policy_stats_t* stats, policy_counters_t* counters,
uint64_t now) {
double throughput;
double loss_rate;
if (now == counters->last_update) return;
#ifdef WITH_POLICY
UPDATE_TYPE(wired);
UPDATE_TYPE(wifi);
UPDATE_TYPE(cellular);
#endif /* WITH_POLICY */
UPDATE_TYPE(all);
counters->last_update = now;
}
#endif /* WITH_POLICY_STATS */
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