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rhashtable: Make selftest modular 

Allow the selftest on the resizable hash table to be built modular, just
like all other tests that do not depend on DEBUG_KERNEL.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Geert Uytterhoeven 2015-01-29 15:40:25 +01:00 committed by David S. Miller
parent 207895fd38
commit 9d6dbe1bba
4 changed files with 229 additions and 206 deletions
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2
lib/Kconfig.debug
View File

@ -1586,7 +1586,7 @@ config TEST_KSTRTOX
tristate "Test kstrto*() family of functions at runtime" tristate "Test kstrto*() family of functions at runtime"
config TEST_RHASHTABLE config TEST_RHASHTABLE
bool "Perform selftest on resizable hash table" tristate "Perform selftest on resizable hash table"
default n default n
help help
Enable this option to test the rhashtable functions at boot. Enable this option to test the rhashtable functions at boot.

1
lib/Makefile
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@ -35,6 +35,7 @@ obj-$(CONFIG_TEST_LKM) += test_module.o
obj-$(CONFIG_TEST_USER_COPY) += test_user_copy.o obj-$(CONFIG_TEST_USER_COPY) += test_user_copy.o
obj-$(CONFIG_TEST_BPF) += test_bpf.o obj-$(CONFIG_TEST_BPF) += test_bpf.o
obj-$(CONFIG_TEST_FIRMWARE) += test_firmware.o obj-$(CONFIG_TEST_FIRMWARE) += test_firmware.o
obj-$(CONFIG_TEST_RHASHTABLE) += test_rhashtable.o
ifeq ($(CONFIG_DEBUG_KOBJECT),y) ifeq ($(CONFIG_DEBUG_KOBJECT),y)
CFLAGS_kobject.o += -DDEBUG CFLAGS_kobject.o += -DDEBUG

205
lib/rhashtable.c
View File

@ -935,208 +935,3 @@ void rhashtable_destroy(struct rhashtable *ht)
mutex_unlock(&ht->mutex); mutex_unlock(&ht->mutex);
} }
EXPORT_SYMBOL_GPL(rhashtable_destroy); EXPORT_SYMBOL_GPL(rhashtable_destroy);
/**************************************************************************
* Self Test
**************************************************************************/
#ifdef CONFIG_TEST_RHASHTABLE
#define TEST_HT_SIZE 8
#define TEST_ENTRIES 2048
#define TEST_PTR ((void *) 0xdeadbeef)
#define TEST_NEXPANDS 4
struct test_obj {
void *ptr;
int value;
struct rhash_head node;
};
static int __init test_rht_lookup(struct rhashtable *ht)
{
unsigned int i;
for (i = 0; i < TEST_ENTRIES * 2; i++) {
struct test_obj *obj;
bool expected = !(i % 2);
u32 key = i;
obj = rhashtable_lookup(ht, &key);
if (expected && !obj) {
pr_warn("Test failed: Could not find key %u\n", key);
return -ENOENT;
} else if (!expected && obj) {
pr_warn("Test failed: Unexpected entry found for key %u\n",
key);
return -EEXIST;
} else if (expected && obj) {
if (obj->ptr != TEST_PTR || obj->value != i) {
pr_warn("Test failed: Lookup value mismatch %p!=%p, %u!=%u\n",
obj->ptr, TEST_PTR, obj->value, i);
return -EINVAL;
}
}
}
return 0;
}
static void test_bucket_stats(struct rhashtable *ht, bool quiet)
{
unsigned int cnt, rcu_cnt, i, total = 0;
struct rhash_head *pos;
struct test_obj *obj;
struct bucket_table *tbl;
tbl = rht_dereference_rcu(ht->tbl, ht);
for (i = 0; i < tbl->size; i++) {
rcu_cnt = cnt = 0;
if (!quiet)
pr_info(" [%#4x/%zu]", i, tbl->size);
rht_for_each_entry_rcu(obj, pos, tbl, i, node) {
cnt++;
total++;
if (!quiet)
pr_cont(" [%p],", obj);
}
rht_for_each_entry_rcu(obj, pos, tbl, i, node)
rcu_cnt++;
if (rcu_cnt != cnt)
pr_warn("Test failed: Chain count mismach %d != %d",
cnt, rcu_cnt);
if (!quiet)
pr_cont("\n [%#x] first element: %p, chain length: %u\n",
i, tbl->buckets[i], cnt);
}
pr_info(" Traversal complete: counted=%u, nelems=%u, entries=%d\n",
total, atomic_read(&ht->nelems), TEST_ENTRIES);
if (total != atomic_read(&ht->nelems) || total != TEST_ENTRIES)
pr_warn("Test failed: Total count mismatch ^^^");
}
static int __init test_rhashtable(struct rhashtable *ht)
{
struct bucket_table *tbl;
struct test_obj *obj;
struct rhash_head *pos, *next;
int err;
unsigned int i;
/*
* Insertion Test:
* Insert TEST_ENTRIES into table with all keys even numbers
*/
pr_info(" Adding %d keys\n", TEST_ENTRIES);
for (i = 0; i < TEST_ENTRIES; i++) {
struct test_obj *obj;
obj = kzalloc(sizeof(*obj), GFP_KERNEL);
if (!obj) {
err = -ENOMEM;
goto error;
}
obj->ptr = TEST_PTR;
obj->value = i * 2;
rhashtable_insert(ht, &obj->node);
}
rcu_read_lock();
test_bucket_stats(ht, true);
test_rht_lookup(ht);
rcu_read_unlock();
for (i = 0; i < TEST_NEXPANDS; i++) {
pr_info(" Table expansion iteration %u...\n", i);
mutex_lock(&ht->mutex);
rhashtable_expand(ht);
mutex_unlock(&ht->mutex);
rcu_read_lock();
pr_info(" Verifying lookups...\n");
test_rht_lookup(ht);
rcu_read_unlock();
}
for (i = 0; i < TEST_NEXPANDS; i++) {
pr_info(" Table shrinkage iteration %u...\n", i);
mutex_lock(&ht->mutex);
rhashtable_shrink(ht);
mutex_unlock(&ht->mutex);
rcu_read_lock();
pr_info(" Verifying lookups...\n");
test_rht_lookup(ht);
rcu_read_unlock();
}
rcu_read_lock();
test_bucket_stats(ht, true);
rcu_read_unlock();
pr_info(" Deleting %d keys\n", TEST_ENTRIES);
for (i = 0; i < TEST_ENTRIES; i++) {
u32 key = i * 2;
obj = rhashtable_lookup(ht, &key);
BUG_ON(!obj);
rhashtable_remove(ht, &obj->node);
kfree(obj);
}
return 0;
error:
tbl = rht_dereference_rcu(ht->tbl, ht);
for (i = 0; i < tbl->size; i++)
rht_for_each_entry_safe(obj, pos, next, tbl, i, node)
kfree(obj);
return err;
}
static int __init test_rht_init(void)
{
struct rhashtable ht;
struct rhashtable_params params = {
.nelem_hint = TEST_HT_SIZE,
.head_offset = offsetof(struct test_obj, node),
.key_offset = offsetof(struct test_obj, value),
.key_len = sizeof(int),
.hashfn = jhash,
.nulls_base = (3U << RHT_BASE_SHIFT),
.grow_decision = rht_grow_above_75,
.shrink_decision = rht_shrink_below_30,
};
int err;
pr_info("Running resizable hashtable tests...\n");
err = rhashtable_init(&ht, &params);
if (err < 0) {
pr_warn("Test failed: Unable to initialize hashtable: %d\n",
err);
return err;
}
err = test_rhashtable(&ht);
rhashtable_destroy(&ht);
return err;
}
subsys_initcall(test_rht_init);
#endif /* CONFIG_TEST_RHASHTABLE */

227
lib/test_rhashtable.c Normal file
View File

@ -0,0 +1,227 @@
/*
* Resizable, Scalable, Concurrent Hash Table
*
* Copyright (c) 2014 Thomas Graf <tgraf@suug.ch>
* Copyright (c) 2008-2014 Patrick McHardy <kaber@trash.net>
*
* Based on the following paper:
* https://www.usenix.org/legacy/event/atc11/tech/final_files/Triplett.pdf
*
* Code partially derived from nft_hash
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
/**************************************************************************
* Self Test
**************************************************************************/
#include <linux/init.h>
#include <linux/jhash.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/rcupdate.h>
#include <linux/rhashtable.h>
#include <linux/slab.h>
#define TEST_HT_SIZE 8
#define TEST_ENTRIES 2048
#define TEST_PTR ((void *) 0xdeadbeef)
#define TEST_NEXPANDS 4
struct test_obj {
void *ptr;
int value;
struct rhash_head node;
};
static int __init test_rht_lookup(struct rhashtable *ht)
{
unsigned int i;
for (i = 0; i < TEST_ENTRIES * 2; i++) {
struct test_obj *obj;
bool expected = !(i % 2);
u32 key = i;
obj = rhashtable_lookup(ht, &key);
if (expected && !obj) {
pr_warn("Test failed: Could not find key %u\n", key);
return -ENOENT;
} else if (!expected && obj) {
pr_warn("Test failed: Unexpected entry found for key %u\n",
key);
return -EEXIST;
} else if (expected && obj) {
if (obj->ptr != TEST_PTR || obj->value != i) {
pr_warn("Test failed: Lookup value mismatch %p!=%p, %u!=%u\n",
obj->ptr, TEST_PTR, obj->value, i);
return -EINVAL;
}
}
}
return 0;
}
static void test_bucket_stats(struct rhashtable *ht, bool quiet)
{
unsigned int cnt, rcu_cnt, i, total = 0;
struct rhash_head *pos;
struct test_obj *obj;
struct bucket_table *tbl;
tbl = rht_dereference_rcu(ht->tbl, ht);
for (i = 0; i < tbl->size; i++) {
rcu_cnt = cnt = 0;
if (!quiet)
pr_info(" [%#4x/%zu]", i, tbl->size);
rht_for_each_entry_rcu(obj, pos, tbl, i, node) {
cnt++;
total++;
if (!quiet)
pr_cont(" [%p],", obj);
}
rht_for_each_entry_rcu(obj, pos, tbl, i, node)
rcu_cnt++;
if (rcu_cnt != cnt)
pr_warn("Test failed: Chain count mismach %d != %d",
cnt, rcu_cnt);
if (!quiet)
pr_cont("\n [%#x] first element: %p, chain length: %u\n",
i, tbl->buckets[i], cnt);
}
pr_info(" Traversal complete: counted=%u, nelems=%u, entries=%d\n",
total, atomic_read(&ht->nelems), TEST_ENTRIES);
if (total != atomic_read(&ht->nelems) || total != TEST_ENTRIES)
pr_warn("Test failed: Total count mismatch ^^^");
}
static int __init test_rhashtable(struct rhashtable *ht)
{
struct bucket_table *tbl;
struct test_obj *obj;
struct rhash_head *pos, *next;
int err;
unsigned int i;
/*
* Insertion Test:
* Insert TEST_ENTRIES into table with all keys even numbers
*/
pr_info(" Adding %d keys\n", TEST_ENTRIES);
for (i = 0; i < TEST_ENTRIES; i++) {
struct test_obj *obj;
obj = kzalloc(sizeof(*obj), GFP_KERNEL);
if (!obj) {
err = -ENOMEM;
goto error;
}
obj->ptr = TEST_PTR;
obj->value = i * 2;
rhashtable_insert(ht, &obj->node);
}
rcu_read_lock();
test_bucket_stats(ht, true);
test_rht_lookup(ht);
rcu_read_unlock();
for (i = 0; i < TEST_NEXPANDS; i++) {
pr_info(" Table expansion iteration %u...\n", i);
mutex_lock(&ht->mutex);
rhashtable_expand(ht);
mutex_unlock(&ht->mutex);
rcu_read_lock();
pr_info(" Verifying lookups...\n");
test_rht_lookup(ht);
rcu_read_unlock();
}
for (i = 0; i < TEST_NEXPANDS; i++) {
pr_info(" Table shrinkage iteration %u...\n", i);
mutex_lock(&ht->mutex);
rhashtable_shrink(ht);
mutex_unlock(&ht->mutex);
rcu_read_lock();
pr_info(" Verifying lookups...\n");
test_rht_lookup(ht);
rcu_read_unlock();
}
rcu_read_lock();
test_bucket_stats(ht, true);
rcu_read_unlock();
pr_info(" Deleting %d keys\n", TEST_ENTRIES);
for (i = 0; i < TEST_ENTRIES; i++) {
u32 key = i * 2;
obj = rhashtable_lookup(ht, &key);
BUG_ON(!obj);
rhashtable_remove(ht, &obj->node);
kfree(obj);
}
return 0;
error:
tbl = rht_dereference_rcu(ht->tbl, ht);
for (i = 0; i < tbl->size; i++)
rht_for_each_entry_safe(obj, pos, next, tbl, i, node)
kfree(obj);
return err;
}
static int __init test_rht_init(void)
{
struct rhashtable ht;
struct rhashtable_params params = {
.nelem_hint = TEST_HT_SIZE,
.head_offset = offsetof(struct test_obj, node),
.key_offset = offsetof(struct test_obj, value),
.key_len = sizeof(int),
.hashfn = jhash,
.nulls_base = (3U << RHT_BASE_SHIFT),
.grow_decision = rht_grow_above_75,
.shrink_decision = rht_shrink_below_30,
};
int err;
pr_info("Running resizable hashtable tests...\n");
err = rhashtable_init(&ht, &params);
if (err < 0) {
pr_warn("Test failed: Unable to initialize hashtable: %d\n",
err);
return err;
}
err = test_rhashtable(&ht);
rhashtable_destroy(&ht);
return err;
}
module_init(test_rht_init);
MODULE_LICENSE("GPL v2");