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test-classifier.c
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/*
* Copyright (c) 2009, 2010, 2011, 2012, 2013, 2014, 2015 Nicira, 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.
*/
/* "White box" tests for classifier.
*
* With very few exceptions, these tests obtain complete coverage of every
* basic block and every branch in the classifier implementation, e.g. a clean
* report from "gcov -b". (Covering the exceptions would require finding
* collisions in the hash function used for flow data, etc.)
*
* This test should receive a clean report from "valgrind --leak-check=full":
* it frees every heap block that it allocates.
*/
#include <config.h>
#undef NDEBUG
#include "classifier.h"
#include <assert.h>
#include <errno.h>
#include <limits.h>
#include "byte-order.h"
#include "classifier-private.h"
#include "command-line.h"
#include "flow.h"
#include "ofp-util.h"
#include "ovstest.h"
#include "packets.h"
#include "random.h"
#include "unaligned.h"
#include "util.h"
/* Fields in a rule. */
#define CLS_FIELDS \
/* struct flow all-caps */ \
/* member name name */ \
/* ----------- -------- */ \
CLS_FIELD(tunnel.tun_id, TUN_ID) \
CLS_FIELD(metadata, METADATA) \
CLS_FIELD(nw_src, NW_SRC) \
CLS_FIELD(nw_dst, NW_DST) \
CLS_FIELD(in_port, IN_PORT) \
CLS_FIELD(vlan_tci, VLAN_TCI) \
CLS_FIELD(dl_type, DL_TYPE) \
CLS_FIELD(tp_src, TP_SRC) \
CLS_FIELD(tp_dst, TP_DST) \
CLS_FIELD(dl_src, DL_SRC) \
CLS_FIELD(dl_dst, DL_DST) \
CLS_FIELD(nw_proto, NW_PROTO) \
CLS_FIELD(nw_tos, NW_DSCP)
/* Field indexes.
*
* (These are also indexed into struct classifier's 'tables' array.) */
enum {
#define CLS_FIELD(MEMBER, NAME) CLS_F_IDX_##NAME,
CLS_FIELDS
#undef CLS_FIELD
CLS_N_FIELDS
};
/* Field information. */
struct cls_field {
int ofs; /* Offset in struct flow. */
int len; /* Length in bytes. */
const char *name; /* Name (for debugging). */
};
static const struct cls_field cls_fields[CLS_N_FIELDS] = {
#define CLS_FIELD(MEMBER, NAME) \
{ offsetof(struct flow, MEMBER), \
sizeof ((struct flow *)0)->MEMBER, \
#NAME },
CLS_FIELDS
#undef CLS_FIELD
};
struct test_rule {
int aux; /* Auxiliary data. */
struct cls_rule cls_rule; /* Classifier rule data. */
};
static struct test_rule *
test_rule_from_cls_rule(const struct cls_rule *rule)
{
return rule ? CONTAINER_OF(rule, struct test_rule, cls_rule) : NULL;
}
static void
test_rule_destroy(struct test_rule *rule)
{
if (rule) {
cls_rule_destroy(&rule->cls_rule);
free(rule);
}
}
static struct test_rule *make_rule(int wc_fields, int priority, int value_pat);
static void free_rule(struct test_rule *);
static struct test_rule *clone_rule(const struct test_rule *);
/* Trivial (linear) classifier. */
struct tcls {
size_t n_rules;
size_t allocated_rules;
struct test_rule **rules;
};
static void
tcls_init(struct tcls *tcls)
{
tcls->n_rules = 0;
tcls->allocated_rules = 0;
tcls->rules = NULL;
}
static void
tcls_destroy(struct tcls *tcls)
{
if (tcls) {
size_t i;
for (i = 0; i < tcls->n_rules; i++) {
test_rule_destroy(tcls->rules[i]);
}
free(tcls->rules);
}
}
static bool
tcls_is_empty(const struct tcls *tcls)
{
return tcls->n_rules == 0;
}
static struct test_rule *
tcls_insert(struct tcls *tcls, const struct test_rule *rule)
{
size_t i;
for (i = 0; i < tcls->n_rules; i++) {
const struct cls_rule *pos = &tcls->rules[i]->cls_rule;
if (cls_rule_equal(pos, &rule->cls_rule)) {
/* Exact match. */
ovsrcu_postpone(free_rule, tcls->rules[i]);
tcls->rules[i] = clone_rule(rule);
return tcls->rules[i];
} else if (pos->priority < rule->cls_rule.priority) {
break;
}
}
if (tcls->n_rules >= tcls->allocated_rules) {
tcls->rules = x2nrealloc(tcls->rules, &tcls->allocated_rules,
sizeof *tcls->rules);
}
if (i != tcls->n_rules) {
memmove(&tcls->rules[i + 1], &tcls->rules[i],
sizeof *tcls->rules * (tcls->n_rules - i));
}
tcls->rules[i] = clone_rule(rule);
tcls->n_rules++;
return tcls->rules[i];
}
static void
tcls_remove(struct tcls *cls, const struct test_rule *rule)
{
size_t i;
for (i = 0; i < cls->n_rules; i++) {
struct test_rule *pos = cls->rules[i];
if (pos == rule) {
test_rule_destroy(pos);
memmove(&cls->rules[i], &cls->rules[i + 1],
sizeof *cls->rules * (cls->n_rules - i - 1));
cls->n_rules--;
return;
}
}
OVS_NOT_REACHED();
}
static bool
match(const struct cls_rule *wild_, const struct flow *fixed)
{
struct match wild;
int f_idx;
minimatch_expand(&wild_->match, &wild);
for (f_idx = 0; f_idx < CLS_N_FIELDS; f_idx++) {
bool eq;
if (f_idx == CLS_F_IDX_NW_SRC) {
eq = !((fixed->nw_src ^ wild.flow.nw_src)
& wild.wc.masks.nw_src);
} else if (f_idx == CLS_F_IDX_NW_DST) {
eq = !((fixed->nw_dst ^ wild.flow.nw_dst)
& wild.wc.masks.nw_dst);
} else if (f_idx == CLS_F_IDX_TP_SRC) {
eq = !((fixed->tp_src ^ wild.flow.tp_src)
& wild.wc.masks.tp_src);
} else if (f_idx == CLS_F_IDX_TP_DST) {
eq = !((fixed->tp_dst ^ wild.flow.tp_dst)
& wild.wc.masks.tp_dst);
} else if (f_idx == CLS_F_IDX_DL_SRC) {
eq = eth_addr_equal_except(fixed->dl_src, wild.flow.dl_src,
wild.wc.masks.dl_src);
} else if (f_idx == CLS_F_IDX_DL_DST) {
eq = eth_addr_equal_except(fixed->dl_dst, wild.flow.dl_dst,
wild.wc.masks.dl_dst);
} else if (f_idx == CLS_F_IDX_VLAN_TCI) {
eq = !((fixed->vlan_tci ^ wild.flow.vlan_tci)
& wild.wc.masks.vlan_tci);
} else if (f_idx == CLS_F_IDX_TUN_ID) {
eq = !((fixed->tunnel.tun_id ^ wild.flow.tunnel.tun_id)
& wild.wc.masks.tunnel.tun_id);
} else if (f_idx == CLS_F_IDX_METADATA) {
eq = !((fixed->metadata ^ wild.flow.metadata)
& wild.wc.masks.metadata);
} else if (f_idx == CLS_F_IDX_NW_DSCP) {
eq = !((fixed->nw_tos ^ wild.flow.nw_tos) &
(wild.wc.masks.nw_tos & IP_DSCP_MASK));
} else if (f_idx == CLS_F_IDX_NW_PROTO) {
eq = !((fixed->nw_proto ^ wild.flow.nw_proto)
& wild.wc.masks.nw_proto);
} else if (f_idx == CLS_F_IDX_DL_TYPE) {
eq = !((fixed->dl_type ^ wild.flow.dl_type)
& wild.wc.masks.dl_type);
} else if (f_idx == CLS_F_IDX_IN_PORT) {
eq = !((fixed->in_port.ofp_port
^ wild.flow.in_port.ofp_port)
& wild.wc.masks.in_port.ofp_port);
} else {
OVS_NOT_REACHED();
}
if (!eq) {
return false;
}
}
return true;
}
static struct cls_rule *
tcls_lookup(const struct tcls *cls, const struct flow *flow)
{
size_t i;
for (i = 0; i < cls->n_rules; i++) {
struct test_rule *pos = cls->rules[i];
if (match(&pos->cls_rule, flow)) {
return &pos->cls_rule;
}
}
return NULL;
}
static void
tcls_delete_matches(struct tcls *cls, const struct cls_rule *target)
{
size_t i;
for (i = 0; i < cls->n_rules; ) {
struct test_rule *pos = cls->rules[i];
if (!minimask_has_extra(&pos->cls_rule.match.mask,
&target->match.mask)) {
struct flow flow;
miniflow_expand(&pos->cls_rule.match.flow, &flow);
if (match(target, &flow)) {
tcls_remove(cls, pos);
continue;
}
}
i++;
}
}
static ovs_be32 nw_src_values[] = { CONSTANT_HTONL(0xc0a80001),
CONSTANT_HTONL(0xc0a04455) };
static ovs_be32 nw_dst_values[] = { CONSTANT_HTONL(0xc0a80002),
CONSTANT_HTONL(0xc0a04455) };
static ovs_be64 tun_id_values[] = {
0,
CONSTANT_HTONLL(UINT64_C(0xfedcba9876543210)) };
static ovs_be64 metadata_values[] = {
0,
CONSTANT_HTONLL(UINT64_C(0xfedcba9876543210)) };
static ofp_port_t in_port_values[] = { OFP_PORT_C(1), OFPP_LOCAL };
static ovs_be16 vlan_tci_values[] = { CONSTANT_HTONS(101), CONSTANT_HTONS(0) };
static ovs_be16 dl_type_values[]
= { CONSTANT_HTONS(ETH_TYPE_IP), CONSTANT_HTONS(ETH_TYPE_ARP) };
static ovs_be16 tp_src_values[] = { CONSTANT_HTONS(49362),
CONSTANT_HTONS(80) };
static ovs_be16 tp_dst_values[] = { CONSTANT_HTONS(6667), CONSTANT_HTONS(22) };
static uint8_t dl_src_values[][ETH_ADDR_LEN] = {
{ 0x00, 0x02, 0xe3, 0x0f, 0x80, 0xa4 },
{ 0x5e, 0x33, 0x7f, 0x5f, 0x1e, 0x99 } };
static uint8_t dl_dst_values[][ETH_ADDR_LEN] = {
{ 0x4a, 0x27, 0x71, 0xae, 0x64, 0xc1 },
{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff } };
static uint8_t nw_proto_values[] = { IPPROTO_TCP, IPPROTO_ICMP };
static uint8_t nw_dscp_values[] = { 48, 0 };
static void *values[CLS_N_FIELDS][2];
static void
init_values(void)
{
values[CLS_F_IDX_TUN_ID][0] = &tun_id_values[0];
values[CLS_F_IDX_TUN_ID][1] = &tun_id_values[1];
values[CLS_F_IDX_METADATA][0] = &metadata_values[0];
values[CLS_F_IDX_METADATA][1] = &metadata_values[1];
values[CLS_F_IDX_IN_PORT][0] = &in_port_values[0];
values[CLS_F_IDX_IN_PORT][1] = &in_port_values[1];
values[CLS_F_IDX_VLAN_TCI][0] = &vlan_tci_values[0];
values[CLS_F_IDX_VLAN_TCI][1] = &vlan_tci_values[1];
values[CLS_F_IDX_DL_SRC][0] = dl_src_values[0];
values[CLS_F_IDX_DL_SRC][1] = dl_src_values[1];
values[CLS_F_IDX_DL_DST][0] = dl_dst_values[0];
values[CLS_F_IDX_DL_DST][1] = dl_dst_values[1];
values[CLS_F_IDX_DL_TYPE][0] = &dl_type_values[0];
values[CLS_F_IDX_DL_TYPE][1] = &dl_type_values[1];
values[CLS_F_IDX_NW_SRC][0] = &nw_src_values[0];
values[CLS_F_IDX_NW_SRC][1] = &nw_src_values[1];
values[CLS_F_IDX_NW_DST][0] = &nw_dst_values[0];
values[CLS_F_IDX_NW_DST][1] = &nw_dst_values[1];
values[CLS_F_IDX_NW_PROTO][0] = &nw_proto_values[0];
values[CLS_F_IDX_NW_PROTO][1] = &nw_proto_values[1];
values[CLS_F_IDX_NW_DSCP][0] = &nw_dscp_values[0];
values[CLS_F_IDX_NW_DSCP][1] = &nw_dscp_values[1];
values[CLS_F_IDX_TP_SRC][0] = &tp_src_values[0];
values[CLS_F_IDX_TP_SRC][1] = &tp_src_values[1];
values[CLS_F_IDX_TP_DST][0] = &tp_dst_values[0];
values[CLS_F_IDX_TP_DST][1] = &tp_dst_values[1];
}
#define N_NW_SRC_VALUES ARRAY_SIZE(nw_src_values)
#define N_NW_DST_VALUES ARRAY_SIZE(nw_dst_values)
#define N_TUN_ID_VALUES ARRAY_SIZE(tun_id_values)
#define N_METADATA_VALUES ARRAY_SIZE(metadata_values)
#define N_IN_PORT_VALUES ARRAY_SIZE(in_port_values)
#define N_VLAN_TCI_VALUES ARRAY_SIZE(vlan_tci_values)
#define N_DL_TYPE_VALUES ARRAY_SIZE(dl_type_values)
#define N_TP_SRC_VALUES ARRAY_SIZE(tp_src_values)
#define N_TP_DST_VALUES ARRAY_SIZE(tp_dst_values)
#define N_DL_SRC_VALUES ARRAY_SIZE(dl_src_values)
#define N_DL_DST_VALUES ARRAY_SIZE(dl_dst_values)
#define N_NW_PROTO_VALUES ARRAY_SIZE(nw_proto_values)
#define N_NW_DSCP_VALUES ARRAY_SIZE(nw_dscp_values)
#define N_FLOW_VALUES (N_NW_SRC_VALUES * \
N_NW_DST_VALUES * \
N_TUN_ID_VALUES * \
N_IN_PORT_VALUES * \
N_VLAN_TCI_VALUES * \
N_DL_TYPE_VALUES * \
N_TP_SRC_VALUES * \
N_TP_DST_VALUES * \
N_DL_SRC_VALUES * \
N_DL_DST_VALUES * \
N_NW_PROTO_VALUES * \
N_NW_DSCP_VALUES)
static unsigned int
get_value(unsigned int *x, unsigned n_values)
{
unsigned int rem = *x % n_values;
*x /= n_values;
return rem;
}
static void
compare_classifiers(struct classifier *cls, struct tcls *tcls)
{
static const int confidence = 500;
unsigned int i;
assert(classifier_count(cls) == tcls->n_rules);
for (i = 0; i < confidence; i++) {
const struct cls_rule *cr0, *cr1, *cr2;
struct flow flow;
struct flow_wildcards wc;
unsigned int x;
flow_wildcards_init_catchall(&wc);
x = random_range(N_FLOW_VALUES);
memset(&flow, 0, sizeof flow);
flow.nw_src = nw_src_values[get_value(&x, N_NW_SRC_VALUES)];
flow.nw_dst = nw_dst_values[get_value(&x, N_NW_DST_VALUES)];
flow.tunnel.tun_id = tun_id_values[get_value(&x, N_TUN_ID_VALUES)];
flow.metadata = metadata_values[get_value(&x, N_METADATA_VALUES)];
flow.in_port.ofp_port = in_port_values[get_value(&x,
N_IN_PORT_VALUES)];
flow.vlan_tci = vlan_tci_values[get_value(&x, N_VLAN_TCI_VALUES)];
flow.dl_type = dl_type_values[get_value(&x, N_DL_TYPE_VALUES)];
flow.tp_src = tp_src_values[get_value(&x, N_TP_SRC_VALUES)];
flow.tp_dst = tp_dst_values[get_value(&x, N_TP_DST_VALUES)];
memcpy(flow.dl_src, dl_src_values[get_value(&x, N_DL_SRC_VALUES)],
ETH_ADDR_LEN);
memcpy(flow.dl_dst, dl_dst_values[get_value(&x, N_DL_DST_VALUES)],
ETH_ADDR_LEN);
flow.nw_proto = nw_proto_values[get_value(&x, N_NW_PROTO_VALUES)];
flow.nw_tos = nw_dscp_values[get_value(&x, N_NW_DSCP_VALUES)];
/* This assertion is here to suppress a GCC 4.9 array-bounds warning */
ovs_assert(cls->n_tries <= CLS_MAX_TRIES);
cr0 = classifier_lookup(cls, &flow, &wc);
cr1 = tcls_lookup(tcls, &flow);
assert((cr0 == NULL) == (cr1 == NULL));
if (cr0 != NULL) {
const struct test_rule *tr0 = test_rule_from_cls_rule(cr0);
const struct test_rule *tr1 = test_rule_from_cls_rule(cr1);
assert(cls_rule_equal(cr0, cr1));
assert(tr0->aux == tr1->aux);
}
cr2 = classifier_lookup(cls, &flow, NULL);
assert(cr2 == cr0);
}
}
static void
destroy_classifier(struct classifier *cls)
{
struct test_rule *rule;
classifier_defer(cls);
CLS_FOR_EACH (rule, cls_rule, cls) {
if (classifier_remove(cls, &rule->cls_rule)) {
ovsrcu_postpone(free_rule, rule);
}
}
classifier_destroy(cls);
}
static void
pvector_verify(const struct pvector *pvec)
{
void *ptr OVS_UNUSED;
int prev_priority = INT_MAX;
PVECTOR_FOR_EACH (ptr, pvec) {
int priority = cursor__.vector[cursor__.entry_idx].priority;
if (priority > prev_priority) {
ovs_abort(0, "Priority vector is out of order (%u > %u)",
priority, prev_priority);
}
prev_priority = priority;
}
}
static unsigned int
trie_verify(const rcu_trie_ptr *trie, unsigned int ofs, unsigned int n_bits)
{
const struct trie_node *node = ovsrcu_get(struct trie_node *, trie);
if (node) {
assert(node->n_rules == 0 || node->n_bits > 0);
ofs += node->n_bits;
assert((ofs > 0 || (ofs == 0 && node->n_bits == 0)) && ofs <= n_bits);
return node->n_rules
+ trie_verify(&node->edges[0], ofs, n_bits)
+ trie_verify(&node->edges[1], ofs, n_bits);
}
return 0;
}
static void
verify_tries(struct classifier *cls)
OVS_NO_THREAD_SAFETY_ANALYSIS
{
unsigned int n_rules = 0;
int i;
for (i = 0; i < cls->n_tries; i++) {
n_rules += trie_verify(&cls->tries[i].root, 0,
cls->tries[i].field->n_bits);
}
assert(n_rules <= cls->n_rules);
}
static void
check_tables(const struct classifier *cls, int n_tables, int n_rules,
int n_dups)
OVS_NO_THREAD_SAFETY_ANALYSIS
{
const struct cls_subtable *table;
struct test_rule *test_rule;
int found_tables = 0;
int found_rules = 0;
int found_dups = 0;
int found_rules2 = 0;
pvector_verify(&cls->subtables);
CMAP_FOR_EACH (table, cmap_node, &cls->subtables_map) {
const struct cls_match *head;
int max_priority = INT_MIN;
unsigned int max_count = 0;
bool found = false;
const struct cls_subtable *iter;
/* Locate the subtable from 'subtables'. */
PVECTOR_FOR_EACH (iter, &cls->subtables) {
if (iter == table) {
if (found) {
ovs_abort(0, "Subtable %p duplicated in 'subtables'.",
table);
}
found = true;
}
}
if (!found) {
ovs_abort(0, "Subtable %p not found from 'subtables'.", table);
}
assert(!cmap_is_empty(&table->rules));
assert(trie_verify(&table->ports_trie, 0, table->ports_mask_len)
== (table->ports_mask_len ? cmap_count(&table->rules) : 0));
found_tables++;
CMAP_FOR_EACH (head, cmap_node, &table->rules) {
int prev_priority = INT_MAX;
const struct cls_match *rule;
if (head->priority > max_priority) {
max_priority = head->priority;
max_count = 1;
} else if (head->priority == max_priority) {
++max_count;
}
found_rules++;
RCULIST_FOR_EACH (rule, list, &head->list) {
assert(rule->priority < prev_priority);
assert(rule->priority <= table->max_priority);
prev_priority = rule->priority;
found_rules++;
found_dups++;
assert(classifier_find_rule_exactly(cls, rule->cls_rule)
== rule->cls_rule);
}
}
assert(table->max_priority == max_priority);
assert(table->max_count == max_count);
}
assert(found_tables == cmap_count(&cls->subtables_map));
assert(found_tables == pvector_count(&cls->subtables));
assert(n_tables == -1 || n_tables == cmap_count(&cls->subtables_map));
assert(n_rules == -1 || found_rules == n_rules);
assert(n_dups == -1 || found_dups == n_dups);
CLS_FOR_EACH (test_rule, cls_rule, cls) {
found_rules2++;
}
assert(found_rules == found_rules2);
}
static struct test_rule *
make_rule(int wc_fields, int priority, int value_pat)
{
const struct cls_field *f;
struct test_rule *rule;
struct match match;
match_init_catchall(&match);
for (f = &cls_fields[0]; f < &cls_fields[CLS_N_FIELDS]; f++) {
int f_idx = f - cls_fields;
int value_idx = (value_pat & (1u << f_idx)) != 0;
memcpy((char *) &match.flow + f->ofs,
values[f_idx][value_idx], f->len);
if (f_idx == CLS_F_IDX_NW_SRC) {
match.wc.masks.nw_src = OVS_BE32_MAX;
} else if (f_idx == CLS_F_IDX_NW_DST) {
match.wc.masks.nw_dst = OVS_BE32_MAX;
} else if (f_idx == CLS_F_IDX_TP_SRC) {
match.wc.masks.tp_src = OVS_BE16_MAX;
} else if (f_idx == CLS_F_IDX_TP_DST) {
match.wc.masks.tp_dst = OVS_BE16_MAX;
} else if (f_idx == CLS_F_IDX_DL_SRC) {
memset(match.wc.masks.dl_src, 0xff, ETH_ADDR_LEN);
} else if (f_idx == CLS_F_IDX_DL_DST) {
memset(match.wc.masks.dl_dst, 0xff, ETH_ADDR_LEN);
} else if (f_idx == CLS_F_IDX_VLAN_TCI) {
match.wc.masks.vlan_tci = OVS_BE16_MAX;
} else if (f_idx == CLS_F_IDX_TUN_ID) {
match.wc.masks.tunnel.tun_id = OVS_BE64_MAX;
} else if (f_idx == CLS_F_IDX_METADATA) {
match.wc.masks.metadata = OVS_BE64_MAX;
} else if (f_idx == CLS_F_IDX_NW_DSCP) {
match.wc.masks.nw_tos |= IP_DSCP_MASK;
} else if (f_idx == CLS_F_IDX_NW_PROTO) {
match.wc.masks.nw_proto = UINT8_MAX;
} else if (f_idx == CLS_F_IDX_DL_TYPE) {
match.wc.masks.dl_type = OVS_BE16_MAX;
} else if (f_idx == CLS_F_IDX_IN_PORT) {
match.wc.masks.in_port.ofp_port = u16_to_ofp(UINT16_MAX);
} else {
OVS_NOT_REACHED();
}
}
rule = xzalloc(sizeof *rule);
cls_rule_init(&rule->cls_rule, &match, wc_fields
? (priority == INT_MIN ? priority + 1 : priority)
: INT_MAX);
return rule;
}
static struct test_rule *
clone_rule(const struct test_rule *src)
{
struct test_rule *dst;
dst = xmalloc(sizeof *dst);
dst->aux = src->aux;
cls_rule_clone(&dst->cls_rule, &src->cls_rule);
return dst;
}
static void
free_rule(struct test_rule *rule)
{
cls_rule_destroy(&rule->cls_rule);
free(rule);
}
static void
shuffle(int *p, size_t n)
{
for (; n > 1; n--, p++) {
int *q = &p[random_range(n)];
int tmp = *p;
*p = *q;
*q = tmp;
}
}
static void
shuffle_u32s(uint32_t *p, size_t n)
{
for (; n > 1; n--, p++) {
uint32_t *q = &p[random_range(n)];
uint32_t tmp = *p;
*p = *q;
*q = tmp;
}
}
/* Classifier tests. */
static enum mf_field_id trie_fields[2] = {
MFF_IPV4_DST, MFF_IPV4_SRC
};
static void
set_prefix_fields(struct classifier *cls)
{
verify_tries(cls);
classifier_set_prefix_fields(cls, trie_fields, ARRAY_SIZE(trie_fields));
verify_tries(cls);
}
/* Tests an empty classifier. */
static void
test_empty(struct ovs_cmdl_context *ctx OVS_UNUSED)
{
struct classifier cls;
struct tcls tcls;
classifier_init(&cls, flow_segment_u64s);
set_prefix_fields(&cls);
tcls_init(&tcls);
assert(classifier_is_empty(&cls));
assert(tcls_is_empty(&tcls));
compare_classifiers(&cls, &tcls);
classifier_destroy(&cls);
tcls_destroy(&tcls);
}
/* Destroys a null classifier. */
static void
test_destroy_null(struct ovs_cmdl_context *ctx OVS_UNUSED)
{
classifier_destroy(NULL);
}
/* Tests classification with one rule at a time. */
static void
test_single_rule(struct ovs_cmdl_context *ctx OVS_UNUSED)
{
unsigned int wc_fields; /* Hilarious. */
for (wc_fields = 0; wc_fields < (1u << CLS_N_FIELDS); wc_fields++) {
struct classifier cls;
struct test_rule *rule, *tcls_rule;
struct tcls tcls;
rule = make_rule(wc_fields,
hash_bytes(&wc_fields, sizeof wc_fields, 0), 0);
classifier_init(&cls, flow_segment_u64s);
set_prefix_fields(&cls);
tcls_init(&tcls);
tcls_rule = tcls_insert(&tcls, rule);
classifier_insert(&cls, &rule->cls_rule, NULL, 0);
compare_classifiers(&cls, &tcls);
check_tables(&cls, 1, 1, 0);
classifier_remove(&cls, &rule->cls_rule);
tcls_remove(&tcls, tcls_rule);
assert(classifier_is_empty(&cls));
assert(tcls_is_empty(&tcls));
compare_classifiers(&cls, &tcls);
ovsrcu_postpone(free_rule, rule);
classifier_destroy(&cls);
tcls_destroy(&tcls);
}
}
/* Tests replacing one rule by another. */
static void
test_rule_replacement(struct ovs_cmdl_context *ctx OVS_UNUSED)
{
unsigned int wc_fields;
for (wc_fields = 0; wc_fields < (1u << CLS_N_FIELDS); wc_fields++) {
struct classifier cls;
struct test_rule *rule1;
struct test_rule *rule2;
struct tcls tcls;
rule1 = make_rule(wc_fields, OFP_DEFAULT_PRIORITY, UINT_MAX);
rule2 = make_rule(wc_fields, OFP_DEFAULT_PRIORITY, UINT_MAX);
rule2->aux += 5;
rule2->aux += 5;
classifier_init(&cls, flow_segment_u64s);
set_prefix_fields(&cls);
tcls_init(&tcls);
tcls_insert(&tcls, rule1);
classifier_insert(&cls, &rule1->cls_rule, NULL, 0);
compare_classifiers(&cls, &tcls);
check_tables(&cls, 1, 1, 0);
tcls_destroy(&tcls);
tcls_init(&tcls);
tcls_insert(&tcls, rule2);
assert(test_rule_from_cls_rule(
classifier_replace(&cls, &rule2->cls_rule,
NULL, 0)) == rule1);
ovsrcu_postpone(free_rule, rule1);
compare_classifiers(&cls, &tcls);
check_tables(&cls, 1, 1, 0);
classifier_defer(&cls);
classifier_remove(&cls, &rule2->cls_rule);
tcls_destroy(&tcls);
destroy_classifier(&cls);
}
}
static int
factorial(int n_items)
{
int n, i;
n = 1;
for (i = 2; i <= n_items; i++) {
n *= i;
}
return n;
}
static void
swap(int *a, int *b)
{
int tmp = *a;
*a = *b;
*b = tmp;
}
static void
reverse(int *a, int n)
{
int i;
for (i = 0; i < n / 2; i++) {
int j = n - (i + 1);
swap(&a[i], &a[j]);
}
}
static bool
next_permutation(int *a, int n)
{
int k;
for (k = n - 2; k >= 0; k--) {
if (a[k] < a[k + 1]) {
int l;
for (l = n - 1; ; l--) {
if (a[l] > a[k]) {
swap(&a[k], &a[l]);
reverse(a + (k + 1), n - (k + 1));
return true;
}
}
}
}
return false;
}
/* Tests classification with rules that have the same matching criteria. */
static void
test_many_rules_in_one_list (struct ovs_cmdl_context *ctx OVS_UNUSED)
{
enum { N_RULES = 3 };
int n_pris;
for (n_pris = N_RULES; n_pris >= 1; n_pris--) {
int ops[N_RULES * 2];
int pris[N_RULES];
int n_permutations;
int i;
pris[0] = 0;
for (i = 1; i < N_RULES; i++) {
pris[i] = pris[i - 1] + (n_pris > i);
}
for (i = 0; i < N_RULES * 2; i++) {
ops[i] = i / 2;
}
n_permutations = 0;
do {
struct test_rule *rules[N_RULES];
struct test_rule *tcls_rules[N_RULES];
int pri_rules[N_RULES];
struct classifier cls;
struct tcls tcls;
n_permutations++;
for (i = 0; i < N_RULES; i++) {
rules[i] = make_rule(456, pris[i], 0);
tcls_rules[i] = NULL;
pri_rules[i] = -1;
}
classifier_init(&cls, flow_segment_u64s);
set_prefix_fields(&cls);
tcls_init(&tcls);
for (i = 0; i < ARRAY_SIZE(ops); i++) {
int j = ops[i];
int m, n;
if (!tcls_rules[j]) {
struct test_rule *displaced_rule;
tcls_rules[j] = tcls_insert(&tcls, rules[j]);
displaced_rule = test_rule_from_cls_rule(
classifier_replace(&cls, &rules[j]->cls_rule,
NULL, 0));
if (pri_rules[pris[j]] >= 0) {
int k = pri_rules[pris[j]];
assert(displaced_rule != NULL);
assert(displaced_rule != rules[j]);
assert(pris[j] == displaced_rule->cls_rule.priority);
tcls_rules[k] = NULL;
} else {
assert(displaced_rule == NULL);
}
pri_rules[pris[j]] = j;
} else {
classifier_remove(&cls, &rules[j]->cls_rule);
tcls_remove(&tcls, tcls_rules[j]);
tcls_rules[j] = NULL;
pri_rules[pris[j]] = -1;
}
compare_classifiers(&cls, &tcls);
n = 0;
for (m = 0; m < N_RULES; m++) {
n += tcls_rules[m] != NULL;
}
check_tables(&cls, n > 0, n, n - 1);
}
classifier_defer(&cls);
for (i = 0; i < N_RULES; i++) {
if (classifier_remove(&cls, &rules[i]->cls_rule)) {
ovsrcu_postpone(free_rule, rules[i]);
}
}
classifier_destroy(&cls);
tcls_destroy(&tcls);
} while (next_permutation(ops, ARRAY_SIZE(ops)));
assert(n_permutations == (factorial(N_RULES * 2) >> N_RULES));
}
}
static int
count_ones(unsigned long int x)
{
int n = 0;
while (x) {
x = zero_rightmost_1bit(x);
n++;
}
return n;
}
static bool
array_contains(int *array, int n, int value)
{
int i;
for (i = 0; i < n; i++) {
if (array[i] == value) {
return true;
}
}
return false;
}
/* Tests classification with two rules at a time that fall into the same
* table but different lists. */
static void
test_many_rules_in_one_table(struct ovs_cmdl_context *ctx OVS_UNUSED)
{
int iteration;
for (iteration = 0; iteration < 50; iteration++) {
enum { N_RULES = 20 };
struct test_rule *rules[N_RULES];
struct test_rule *tcls_rules[N_RULES];
struct classifier cls;
struct tcls tcls;
int value_pats[N_RULES];
int value_mask;
int wcf;
int i;
do {
wcf = random_uint32() & ((1u << CLS_N_FIELDS) - 1);
value_mask = ~wcf & ((1u << CLS_N_FIELDS) - 1);
} while ((1 << count_ones(value_mask)) < N_RULES);
classifier_init(&cls, flow_segment_u64s);
set_prefix_fields(&cls);
tcls_init(&tcls);
for (i = 0; i < N_RULES; i++) {
int priority = random_range(INT_MAX);
do {
value_pats[i] = random_uint32() & value_mask;
} while (array_contains(value_pats, i, value_pats[i]));