// SPDX-License-Identifier: GPL-2.0
/*
* KUnit test for the Kernel Hashtable structures.
*
* Copyright (C) 2022, Google LLC.
* Author: Rae Moar <rmoar@google.com>
*/
#include <kunit/test.h>
#include <linux/hashtable.h>
struct hashtable_test_entry {
int key;
int data;
struct hlist_node node;
int visited;
};
static void hashtable_test_hash_init(struct kunit *test)
{
/* Test the different ways of initialising a hashtable. */
DEFINE_HASHTABLE(hash1, 2);
DECLARE_HASHTABLE(hash2, 3);
/* When using DECLARE_HASHTABLE, must use hash_init to
* initialize the hashtable.
*/
hash_init(hash2);
KUNIT_EXPECT_TRUE(test, hash_empty(hash1));
KUNIT_EXPECT_TRUE(test, hash_empty(hash2));
}
static void hashtable_test_hash_empty(struct kunit *test)
{
struct hashtable_test_entry a;
DEFINE_HASHTABLE(hash, 1);
KUNIT_EXPECT_TRUE(test, hash_empty(hash));
a.key = 1;
a.data = 13;
hash_add(hash, &a.node, a.key);
/* Hashtable should no longer be empty. */
KUNIT_EXPECT_FALSE(test, hash_empty(hash));
}
static void hashtable_test_hash_hashed(struct kunit *test)
{
struct hashtable_test_entry a, b;
DEFINE_HASHTABLE(hash, 4);
a.key = 1;
a.data = 13;
hash_add(hash, &a.node, a.key);
b.key = 1;
b.data = 2;
hash_add(hash, &b.node, b.key);
KUNIT_EXPECT_TRUE(test, hash_hashed(&a.node));
KUNIT_EXPECT_TRUE(test, hash_hashed(&b.node));
}
static void hashtable_test_hash_add(struct kunit *test)
{
struct hashtable_test_entry a, b, *x;
int bkt;
DEFINE_HASHTABLE(hash, 3);
a.key = 1;
a.data = 13;
a.visited = 0;
hash_add(hash, &a.node, a.key);
b.key = 2;
b.data = 10;
b.visited = 0;
hash_add(hash, &b.node, b.key);
hash_for_each(hash, bkt, x, node) {
x->visited++;
if (x->key == a.key)
KUNIT_EXPECT_EQ(test, x->data, 13);
else if (x->key == b.key)
KUNIT_EXPECT_EQ(test, x->data, 10);
else
KUNIT_FAIL(test, "Unexpected key in hashtable.");
}
/* Both entries should have been visited exactly once. */
KUNIT_EXPECT_EQ(test, a.visited, 1);
KUNIT_EXPECT_EQ(test, b.visited, 1);
}
static void hashtable_test_hash_del(struct kunit *test)
{
struct hashtable_test_entry a, b, *x;
DEFINE_HASHTABLE(hash, 6);
a.key = 1;
a.data = 13;
hash_add(hash, &a.node, a.key);
b.key = 2;
b.data = 10;
b.visited = 0;
hash_add(hash, &b.node, b.key);
hash_del(&b.node);
hash_for_each_possible(hash, x, node, b.key) {
x->visited++;
KUNIT_EXPECT_NE(test, x->key, b.key);
}
/* The deleted entry should not have been visited. */
KUNIT_EXPECT_EQ(test, b.visited, 0);
hash_del(&a.node);
/* The hashtable should be empty. */
KUNIT_EXPECT_TRUE(test, hash_empty(hash));
}
static void hashtable_test_hash_for_each(struct kunit *test)
{
struct hashtable_test_entry entries[3];
struct hashtable_test_entry *x;
int bkt, i, j, count;
DEFINE_HASHTABLE(hash, 3);
/* Add three entries to the hashtable. */
for (i = 0; i < 3; i++) {
entries[i].key = i;
entries[i].data = i + 10;
entries[i].visited = 0;
hash_add(hash, &entries[i].node, entries[i].key);
}
count = 0;
hash_for_each(hash, bkt, x, node) {
x->visited += 1;
KUNIT_ASSERT_GE_MSG(test, x->key, 0, "Unexpected key in hashtable.");
KUNIT_ASSERT_LT_MSG(test, x->key, 3, "Unexpected key in hashtable.");
count++;
}
/* Should have visited each entry exactly once. */
KUNIT_EXPECT_EQ(test, count, 3);
for (j = 0; j < 3; j++)
KUNIT_EXPECT_EQ(test, entries[j].visited, 1);
}
static void hashtable_test_hash_for_each_safe(struct kunit *test)
{
struct hashtable_test_entry entries[3];
struct hashtable_test_entry *x;
struct hlist_node *tmp;
int bkt, i, j, count;
DEFINE_HASHTABLE(hash, 3);
/* Add three entries to the hashtable. */
for (i = 0; i < 3; i++) {
entries[i].key = i;
entries[i].data = i + 10;
entries[i].visited = 0;
hash_add(hash, &entries[i].node, entries[i].key);
}
count = 0;
hash_for_each_safe(hash, bkt, tmp, x, node) {
x->visited += 1;
KUNIT_ASSERT_GE_MSG(test, x->key, 0, "Unexpected key in hashtable.");
KUNIT_ASSERT_LT_MSG(test, x->key, 3, "Unexpected key in hashtable.");
count++;
/* Delete entry during loop. */
hash_del(&x->node);
}
/* Should have visited each entry exactly once. */
KUNIT_EXPECT_EQ(test, count, 3);
for (j = 0; j < 3; j++)
KUNIT_EXPECT_EQ(test, entries[j].visited, 1);
}
static void hashtable_test_hash_for_each_possible(struct kunit *test)
{
struct hashtable_test_entry entries[4];
struct hashtable_test_entry *x, *y;
int buckets[2];
int bkt, i, j, count;
DEFINE_HASHTABLE(hash, 5);
/* Add three entries with key = 0 to the hashtable. */
for (i = 0; i < 3; i++) {
entries[i].key = 0;
entries[i].data = i;
entries[i].visited = 0;
hash_add(hash, &entries[i].node, entries[i].key);
}
/* Add an entry with key = 1. */
entries[3].key = 1;
entries[3].data = 3;
entries[3].visited = 0;
hash_add(hash, &entries[3].node, entries[3].key);
count = 0;
hash_for_each_possible(hash, x, node, 0) {
x->visited += 1;
KUNIT_ASSERT_GE_MSG(test, x->data, 0, "Unexpected data in hashtable.");
KUNIT_ASSERT_LT_MSG(test, x->data, 4, "Unexpected data in hashtable.");
count++;
}
/* Should have visited each entry with key = 0 exactly once. */
for (j = 0; j < 3; j++)
KUNIT_EXPECT_EQ(test, entries[j].visited, 1);
/* Save the buckets for the different keys. */
hash_for_each(hash, bkt, y, node) {
KUNIT_ASSERT_GE_MSG(test, y->key, 0, "Unexpected key in hashtable.");
KUNIT_ASSERT_LE_MSG(test, y->key, 1, "Unexpected key in hashtable.");
buckets[y->key] = bkt;
}
/* If entry with key = 1 is in the same bucket as the entries with
* key = 0, check it was visited. Otherwise ensure that only three
* entries were visited.
*/
if (buckets[0] == buckets[1]) {
KUNIT_EXPECT_EQ(test, count, 4);
KUNIT_EXPECT_EQ(test, entries[3].visited, 1);
} else {
KUNIT_EXPECT_EQ(test, count, 3);
KUNIT_EXPECT_EQ(test, entries[3].visited, 0);
}
}
static void hashtable_test_hash_for_each_possible_safe(struct kunit *test)
{
struct hashtable_test_entry entries[4];
struct hashtable_test_entry *x, *y;
struct hlist_node *tmp;
int buckets[2];
int bkt, i, j, count;
DEFINE_HASHTABLE(hash, 5);
/* Add three entries with key = 0 to the hashtable. */
for (i = 0; i < 3; i++) {
entries[i].key = 0;
entries[i].data = i;
entries[i].visited = 0;
hash_add(hash, &entries[i].node, entries[i].key);
}
/* Add an entry with key = 1. */
entries[3].key = 1;
entries[3].data = 3;
entries[3].visited = 0;
hash_add(hash, &entries[3].node, entries[3].key);
count = 0;
hash_for_each_possible_safe(hash, x, tmp, node, 0) {
x->visited += 1;
KUNIT_ASSERT_GE_MSG(test, x->data, 0, "Unexpected data in hashtable.");
KUNIT_ASSERT_LT_MSG(test, x->data, 4, "Unexpected data in hashtable.");
count++;
/* Delete entry during loop. */
hash_del(&x->node);
}
/* Should have visited each entry with key = 0 exactly once. */
for (j = 0; j < 3; j++)
KUNIT_EXPECT_EQ(test, entries[j].visited, 1);
/* Save the buckets for the different keys. */
hash_for_each(hash, bkt, y, node) {
KUNIT_ASSERT_GE_MSG(test, y->key, 0, "Unexpected key in hashtable.");
KUNIT_ASSERT_LE_MSG(test, y->key, 1, "Unexpected key in hashtable.");
buckets[y->key] = bkt;
}
/* If entry with key = 1 is in the same bucket as the entries with
* key = 0, check it was visited. Otherwise ensure that only three
* entries were visited.
*/
if (buckets[0] == buckets[1]) {
KUNIT_EXPECT_EQ(test, count, 4);
KUNIT_EXPECT_EQ(test, entries[3].visited, 1);
} else {
KUNIT_EXPECT_EQ(test, count, 3);
KUNIT_EXPECT_EQ(test, entries[3].visited, 0);
}
}
static struct kunit_case hashtable_test_cases[] = {
KUNIT_CASE(hashtable_test_hash_init),
KUNIT_CASE(hashtable_test_hash_empty),
KUNIT_CASE(hashtable_test_hash_hashed),
KUNIT_CASE(hashtable_test_hash_add),
KUNIT_CASE(hashtable_test_hash_del),
KUNIT_CASE(hashtable_test_hash_for_each),
KUNIT_CASE(hashtable_test_hash_for_each_safe),
KUNIT_CASE(hashtable_test_hash_for_each_possible),
KUNIT_CASE(hashtable_test_hash_for_each_possible_safe),
{},
};
static struct kunit_suite hashtable_test_module = {
.name = "hashtable",
.test_cases = hashtable_test_cases,
};
kunit_test_suites(&hashtable_test_module);
MODULE_LICENSE("GPL");
