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/*
* Copyright (c) 2024 Red Hat, Inc.
*
* 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.
*/
#include <config.h>
#include "ofproto-dpif-lsample.h"
#include "cmap.h"
#include "hash.h"
#include "ofproto.h"
#include "openvswitch/thread.h"
/* Dpif local sampling.
*
* Thread safety: dpif_lsample allows lockless concurrent reads of local
* sampling exporters as long as the following restrictions are met:
* 1) While the last reference is being dropped, i.e: a thread is calling
* "dpif_lsample_unref" on the last reference, other threads cannot call
* "dpif_lsample_ref".
* 2) Threads do not quiese while holding references to internal
* lsample_exporter objects.
*/
struct dpif_lsample {
struct cmap exporters; /* Contains lsample_exporter_node instances
* indexed by collector_set_id. */
struct ovs_mutex mutex; /* Protects concurrent insertion/deletion
* of exporters. */
struct ovs_refcount ref_cnt; /* Controls references to this instance. */
};
struct lsample_exporter {
struct ofproto_lsample_options options;
};
struct lsample_exporter_node {
struct cmap_node node; /* In dpif_lsample->exporters. */
struct lsample_exporter exporter;
};
static void
dpif_lsample_delete_exporter(struct dpif_lsample *lsample,
struct lsample_exporter_node *node)
{
ovs_mutex_lock(&lsample->mutex);
cmap_remove(&lsample->exporters, &node->node,
hash_int(node->exporter.options.collector_set_id, 0));
ovs_mutex_unlock(&lsample->mutex);
ovsrcu_postpone(free, node);
}
/* Adds an exporter with the provided options which are copied. */
static struct lsample_exporter_node *
dpif_lsample_add_exporter(struct dpif_lsample *lsample,
const struct ofproto_lsample_options *options)
{
struct lsample_exporter_node *node;
node = xzalloc(sizeof *node);
node->exporter.options = *options;
ovs_mutex_lock(&lsample->mutex);
cmap_insert(&lsample->exporters, &node->node,
hash_int(options->collector_set_id, 0));
ovs_mutex_unlock(&lsample->mutex);
return node;
}
static struct lsample_exporter_node *
dpif_lsample_find_exporter_node(const struct dpif_lsample *lsample,
const uint32_t collector_set_id)
{
struct lsample_exporter_node *node;
CMAP_FOR_EACH_WITH_HASH (node, node, hash_int(collector_set_id, 0),
&lsample->exporters) {
if (node->exporter.options.collector_set_id == collector_set_id) {
return node;
}
}
return NULL;
}
/* Sets the lsample configuration and returns true if the configuration
* has changed. */
bool
dpif_lsample_set_options(struct dpif_lsample *lsample,
const struct ofproto_lsample_options *options,
size_t n_options)
{
const struct ofproto_lsample_options *opt;
struct lsample_exporter_node *node;
bool changed = false;
int i;
for (i = 0; i < n_options; i++) {
opt = &options[i];
node = dpif_lsample_find_exporter_node(lsample,
opt->collector_set_id);
if (!node) {
dpif_lsample_add_exporter(lsample, opt);
changed = true;
} else if (memcmp(&node->exporter.options, opt, sizeof *opt)) {
dpif_lsample_delete_exporter(lsample, node);
dpif_lsample_add_exporter(lsample, opt);
changed = true;
}
}
/* Delete exporters that have been removed. */
CMAP_FOR_EACH (node, node, &lsample->exporters) {
for (i = 0; i < n_options; i++) {
if (node->exporter.options.collector_set_id
== options[i].collector_set_id) {
break;
}
}
if (i == n_options) {
dpif_lsample_delete_exporter(lsample, node);
changed = true;
}
}
return changed;
}
/* Returns the group_id for a given collector_set_id, if it exists. */
bool
dpif_lsample_get_group_id(struct dpif_lsample *ps, uint32_t collector_set_id,
uint32_t *group_id)
{
struct lsample_exporter_node *node;
node = dpif_lsample_find_exporter_node(ps, collector_set_id);
if (node) {
*group_id = node->exporter.options.group_id;
}
return !!node;
}
struct dpif_lsample *
dpif_lsample_create(void)
{
struct dpif_lsample *lsample;
lsample = xzalloc(sizeof *lsample);
cmap_init(&lsample->exporters);
ovs_mutex_init(&lsample->mutex);
ovs_refcount_init(&lsample->ref_cnt);
return lsample;
}
static void
dpif_lsample_destroy(struct dpif_lsample *lsample)
{
if (lsample) {
struct lsample_exporter_node *node;
CMAP_FOR_EACH (node, node, &lsample->exporters) {
dpif_lsample_delete_exporter(lsample, node);
}
cmap_destroy(&lsample->exporters);
free(lsample);
}
}
struct dpif_lsample *
dpif_lsample_ref(const struct dpif_lsample *lsample_)
{
struct dpif_lsample *lsample = CONST_CAST(struct dpif_lsample *, lsample_);
if (lsample) {
ovs_refcount_ref(&lsample->ref_cnt);
}
return lsample;
}
void
dpif_lsample_unref(struct dpif_lsample *lsample)
{
if (lsample && ovs_refcount_unref_relaxed(&lsample->ref_cnt) == 1) {
dpif_lsample_destroy(lsample);
}
}
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