// SPDX-License-Identifier: GPL-2.0
/*
* KUnit test for struct string_stream.
*
* Copyright (C) 2019, Google LLC.
* Author: Brendan Higgins <[email protected]>
*/
#include <kunit/static_stub.h>
#include <kunit/test.h>
#include <linux/ktime.h>
#include <linux/slab.h>
#include <linux/timekeeping.h>
#include "string-stream.h"
struct string_stream_test_priv {
/* For testing resource-managed free. */
struct string_stream *expected_free_stream;
bool stream_was_freed;
bool stream_free_again;
};
/* Avoids a cast warning if kfree() is passed direct to kunit_add_action(). */
KUNIT_DEFINE_ACTION_WRAPPER(kfree_wrapper, kfree, const void *);
/* Avoids a cast warning if string_stream_destroy() is passed direct to kunit_add_action(). */
KUNIT_DEFINE_ACTION_WRAPPER(cleanup_raw_stream, string_stream_destroy, struct string_stream *);
static char *get_concatenated_string(struct kunit *test, struct string_stream *stream)
{
char *str = string_stream_get_string(stream);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, str);
kunit_add_action(test, kfree_wrapper, (void *)str);
return str;
}
/* Managed string_stream object is initialized correctly. */
static void string_stream_managed_init_test(struct kunit *test)
{
struct string_stream *stream;
/* Resource-managed initialization. */
stream = kunit_alloc_string_stream(test, GFP_KERNEL);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, stream);
KUNIT_EXPECT_EQ(test, stream->length, 0);
KUNIT_EXPECT_TRUE(test, list_empty(&stream->fragments));
KUNIT_EXPECT_TRUE(test, (stream->gfp == GFP_KERNEL));
KUNIT_EXPECT_FALSE(test, stream->append_newlines);
KUNIT_EXPECT_TRUE(test, string_stream_is_empty(stream));
}
/* Unmanaged string_stream object is initialized correctly. */
static void string_stream_unmanaged_init_test(struct kunit *test)
{
struct string_stream *stream;
stream = alloc_string_stream(GFP_KERNEL);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, stream);
kunit_add_action(test, cleanup_raw_stream, stream);
KUNIT_EXPECT_EQ(test, stream->length, 0);
KUNIT_EXPECT_TRUE(test, list_empty(&stream->fragments));
KUNIT_EXPECT_TRUE(test, (stream->gfp == GFP_KERNEL));
KUNIT_EXPECT_FALSE(test, stream->append_newlines);
KUNIT_EXPECT_TRUE(test, string_stream_is_empty(stream));
}
static void string_stream_destroy_stub(struct string_stream *stream)
{
struct kunit *fake_test = kunit_get_current_test();
struct string_stream_test_priv *priv = fake_test->priv;
/* The kunit could own string_streams other than the one we are testing. */
if (stream == priv->expected_free_stream) {
if (priv->stream_was_freed)
priv->stream_free_again = true;
else
priv->stream_was_freed = true;
}
/*
* Calling string_stream_destroy() will only call this function again
* because the redirection stub is still active.
* Avoid calling deactivate_static_stub() or changing current->kunit_test
* during cleanup.
*/
string_stream_clear(stream);
kfree(stream);
}
/* kunit_free_string_stream() calls string_stream_desrtoy() */
static void string_stream_managed_free_test(struct kunit *test)
{
struct string_stream_test_priv *priv = test->priv;
priv->expected_free_stream = NULL;
priv->stream_was_freed = false;
priv->stream_free_again = false;
kunit_activate_static_stub(test,
string_stream_destroy,
string_stream_destroy_stub);
priv->expected_free_stream = kunit_alloc_string_stream(test, GFP_KERNEL);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, priv->expected_free_stream);
/* This should call the stub function. */
kunit_free_string_stream(test, priv->expected_free_stream);
KUNIT_EXPECT_TRUE(test, priv->stream_was_freed);
KUNIT_EXPECT_FALSE(test, priv->stream_free_again);
}
/* string_stream object is freed when test is cleaned up. */
static void string_stream_resource_free_test(struct kunit *test)
{
struct string_stream_test_priv *priv = test->priv;
struct kunit *fake_test;
fake_test = kunit_kzalloc(test, sizeof(*fake_test), GFP_KERNEL);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, fake_test);
kunit_init_test(fake_test, "string_stream_fake_test", NULL);
fake_test->priv = priv;
/*
* Activate stub before creating string_stream so the
* string_stream will be cleaned up first.
*/
priv->expected_free_stream = NULL;
priv->stream_was_freed = false;
priv->stream_free_again = false;
kunit_activate_static_stub(fake_test,
string_stream_destroy,
string_stream_destroy_stub);
priv->expected_free_stream = kunit_alloc_string_stream(fake_test, GFP_KERNEL);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, priv->expected_free_stream);
/* Set current->kunit_test to fake_test so the static stub will be called. */
current->kunit_test = fake_test;
/* Cleanup test - the stub function should be called */
kunit_cleanup(fake_test);
/* Set current->kunit_test back to current test. */
current->kunit_test = test;
KUNIT_EXPECT_TRUE(test, priv->stream_was_freed);
KUNIT_EXPECT_FALSE(test, priv->stream_free_again);
}
/*
* Add a series of lines to a string_stream. Check that all lines
* appear in the correct order and no characters are dropped.
*/
static void string_stream_line_add_test(struct kunit *test)
{
struct string_stream *stream;
char line[60];
char *concat_string, *pos, *string_end;
size_t len, total_len;
int num_lines, i;
stream = kunit_alloc_string_stream(test, GFP_KERNEL);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, stream);
/* Add series of sequence numbered lines */
total_len = 0;
for (i = 0; i < 100; ++i) {
len = snprintf(line, sizeof(line),
"The quick brown fox jumps over the lazy penguin %d\n", i);
/* Sanity-check that our test string isn't truncated */
KUNIT_ASSERT_LT(test, len, sizeof(line));
string_stream_add(stream, line);
total_len += len;
}
num_lines = i;
concat_string = get_concatenated_string(test, stream);
KUNIT_EXPECT_NOT_ERR_OR_NULL(test, concat_string);
KUNIT_EXPECT_EQ(test, strlen(concat_string), total_len);
/*
* Split the concatenated string at the newlines and check that
* all the original added strings are present.
*/
pos = concat_string;
for (i = 0; i < num_lines; ++i) {
string_end = strchr(pos, '\n');
KUNIT_EXPECT_NOT_NULL(test, string_end);
/* Convert to NULL-terminated string */
*string_end = '\0';
snprintf(line, sizeof(line),
"The quick brown fox jumps over the lazy penguin %d", i);
KUNIT_EXPECT_STREQ(test, pos, line);
pos = string_end + 1;
}
/* There shouldn't be any more data after this */
KUNIT_EXPECT_EQ(test, strlen(pos), 0);
}
/* Add a series of lines of variable length to a string_stream. */
static void string_stream_variable_length_line_test(struct kunit *test)
{
static const char line[] =
"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
" 0123456789!$%^&*()_-+={}[]:;@'~#<>,.?/|";
struct string_stream *stream;
struct rnd_state rnd;
char *concat_string, *pos, *string_end;
size_t offset, total_len;
int num_lines, i;
stream = kunit_alloc_string_stream(test, GFP_KERNEL);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, stream);
/*
* Log many lines of varying lengths until we have created
* many fragments.
* The "randomness" must be repeatable.
*/
prandom_seed_state(&rnd, 3141592653589793238ULL);
total_len = 0;
for (i = 0; i < 100; ++i) {
offset = prandom_u32_state(&rnd) % (sizeof(line) - 1);
string_stream_add(stream, "%s\n", &line[offset]);
total_len += sizeof(line) - offset;
}
num_lines = i;
concat_string = get_concatenated_string(test, stream);
KUNIT_EXPECT_NOT_ERR_OR_NULL(test, concat_string);
KUNIT_EXPECT_EQ(test, strlen(concat_string), total_len);
/*
* Split the concatenated string at the newlines and check that
* all the original added strings are present.
*/
prandom_seed_state(&rnd, 3141592653589793238ULL);
pos = concat_string;
for (i = 0; i < num_lines; ++i) {
string_end = strchr(pos, '\n');
KUNIT_EXPECT_NOT_NULL(test, string_end);
/* Convert to NULL-terminated string */
*string_end = '\0';
offset = prandom_u32_state(&rnd) % (sizeof(line) - 1);
KUNIT_EXPECT_STREQ(test, pos, &line[offset]);
pos = string_end + 1;
}
/* There shouldn't be any more data after this */
KUNIT_EXPECT_EQ(test, strlen(pos), 0);
}
/* Appending the content of one string stream to another. */
static void string_stream_append_test(struct kunit *test)
{
static const char * const strings_1[] = {
"one", "two", "three", "four", "five", "six",
"seven", "eight", "nine", "ten",
};
static const char * const strings_2[] = {
"Apple", "Pear", "Orange", "Banana", "Grape", "Apricot",
};
struct string_stream *stream_1, *stream_2;
const char *stream1_content_before_append, *stream_2_content;
char *combined_content;
size_t combined_length;
int i;
stream_1 = kunit_alloc_string_stream(test, GFP_KERNEL);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, stream_1);
stream_2 = kunit_alloc_string_stream(test, GFP_KERNEL);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, stream_2);
/* Append content of empty stream to empty stream */
string_stream_append(stream_1, stream_2);
KUNIT_EXPECT_EQ(test, strlen(get_concatenated_string(test, stream_1)), 0);
/* Add some data to stream_1 */
for (i = 0; i < ARRAY_SIZE(strings_1); ++i)
string_stream_add(stream_1, "%s\n", strings_1[i]);
stream1_content_before_append = get_concatenated_string(test, stream_1);
/* Append content of empty stream to non-empty stream */
string_stream_append(stream_1, stream_2);
KUNIT_EXPECT_STREQ(test, get_concatenated_string(test, stream_1),
stream1_content_before_append);
/* Add some data to stream_2 */
for (i = 0; i < ARRAY_SIZE(strings_2); ++i)
string_stream_add(stream_2, "%s\n", strings_2[i]);
/* Append content of non-empty stream to non-empty stream */
string_stream_append(stream_1, stream_2);
/*
* End result should be the original content of stream_1 plus
* the content of stream_2.
*/
stream_2_content = get_concatenated_string(test, stream_2);
combined_length = strlen(stream1_content_before_append) + strlen(stream_2_content);
combined_length++; /* for terminating \0 */
combined_content = kunit_kmalloc(test, combined_length, GFP_KERNEL);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, combined_content);
snprintf(combined_content, combined_length, "%s%s",
stream1_content_before_append, stream_2_content);
KUNIT_EXPECT_STREQ(test, get_concatenated_string(test, stream_1), combined_content);
/* Append content of non-empty stream to empty stream */
kunit_free_string_stream(test, stream_1);
stream_1 = kunit_alloc_string_stream(test, GFP_KERNEL);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, stream_1);
string_stream_append(stream_1, stream_2);
KUNIT_EXPECT_STREQ(test, get_concatenated_string(test, stream_1), stream_2_content);
}
/* Appending the content of one string stream to one with auto-newlining. */
static void string_stream_append_auto_newline_test(struct kunit *test)
{
struct string_stream *stream_1, *stream_2;
/* Stream 1 has newline appending enabled */
stream_1 = kunit_alloc_string_stream(test, GFP_KERNEL);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, stream_1);
string_stream_set_append_newlines(stream_1, true);
KUNIT_EXPECT_TRUE(test, stream_1->append_newlines);
/* Stream 2 does not append newlines */
stream_2 = kunit_alloc_string_stream(test, GFP_KERNEL);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, stream_2);
/* Appending a stream with a newline should not add another newline */
string_stream_add(stream_1, "Original string\n");
string_stream_add(stream_2, "Appended content\n");
string_stream_add(stream_2, "More stuff\n");
string_stream_append(stream_1, stream_2);
KUNIT_EXPECT_STREQ(test, get_concatenated_string(test, stream_1),
"Original string\nAppended content\nMore stuff\n");
kunit_free_string_stream(test, stream_2);
stream_2 = kunit_alloc_string_stream(test, GFP_KERNEL);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, stream_2);
/*
* Appending a stream without newline should add a final newline.
* The appended string_stream is treated as a single string so newlines
* should not be inserted between fragments.
*/
string_stream_add(stream_2, "Another");
string_stream_add(stream_2, "And again");
string_stream_append(stream_1, stream_2);
KUNIT_EXPECT_STREQ(test, get_concatenated_string(test, stream_1),
"Original string\nAppended content\nMore stuff\nAnotherAnd again\n");
}
/* Adding an empty string should not create a fragment. */
static void string_stream_append_empty_string_test(struct kunit *test)
{
struct string_stream *stream;
int original_frag_count;
stream = kunit_alloc_string_stream(test, GFP_KERNEL);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, stream);
/* Formatted empty string */
string_stream_add(stream, "%s", "");
KUNIT_EXPECT_TRUE(test, string_stream_is_empty(stream));
KUNIT_EXPECT_TRUE(test, list_empty(&stream->fragments));
/* Adding an empty string to a non-empty stream */
string_stream_add(stream, "Add this line");
original_frag_count = list_count_nodes(&stream->fragments);
string_stream_add(stream, "%s", "");
KUNIT_EXPECT_EQ(test, list_count_nodes(&stream->fragments), original_frag_count);
KUNIT_EXPECT_STREQ(test, get_concatenated_string(test, stream), "Add this line");
}
/* Adding strings without automatic newline appending */
static void string_stream_no_auto_newline_test(struct kunit *test)
{
struct string_stream *stream;
stream = kunit_alloc_string_stream(test, GFP_KERNEL);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, stream);
/*
* Add some strings with and without newlines. All formatted newlines
* should be preserved. It should not add any extra newlines.
*/
string_stream_add(stream, "One");
string_stream_add(stream, "Two\n");
string_stream_add(stream, "%s\n", "Three");
string_stream_add(stream, "%s", "Four\n");
string_stream_add(stream, "Five\n%s", "Six");
string_stream_add(stream, "Seven\n\n");
string_stream_add(stream, "Eight");
KUNIT_EXPECT_STREQ(test, get_concatenated_string(test, stream),
"OneTwo\nThree\nFour\nFive\nSixSeven\n\nEight");
}
/* Adding strings with automatic newline appending */
static void string_stream_auto_newline_test(struct kunit *test)
{
struct string_stream *stream;
stream = kunit_alloc_string_stream(test, GFP_KERNEL);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, stream);
string_stream_set_append_newlines(stream, true);
KUNIT_EXPECT_TRUE(test, stream->append_newlines);
/*
* Add some strings with and without newlines. Newlines should
* be appended to lines that do not end with \n, but newlines
* resulting from the formatting should not be changed.
*/
string_stream_add(stream, "One");
string_stream_add(stream, "Two\n");
string_stream_add(stream, "%s\n", "Three");
string_stream_add(stream, "%s", "Four\n");
string_stream_add(stream, "Five\n%s", "Six");
string_stream_add(stream, "Seven\n\n");
string_stream_add(stream, "Eight");
KUNIT_EXPECT_STREQ(test, get_concatenated_string(test, stream),
"One\nTwo\nThree\nFour\nFive\nSix\nSeven\n\nEight\n");
}
/*
* This doesn't actually "test" anything. It reports time taken
* and memory used for logging a large number of lines.
*/
static void string_stream_performance_test(struct kunit *test)
{
struct string_stream_fragment *frag_container;
struct string_stream *stream;
char test_line[101];
ktime_t start_time, end_time;
size_t len, bytes_requested, actual_bytes_used, total_string_length;
int offset, i;
stream = kunit_alloc_string_stream(test, GFP_KERNEL);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, stream);
memset(test_line, 'x', sizeof(test_line) - 1);
test_line[sizeof(test_line) - 1] = '\0';
start_time = ktime_get();
for (i = 0; i < 10000; i++) {
offset = i % (sizeof(test_line) - 1);
string_stream_add(stream, "%s: %d\n", &test_line[offset], i);
}
end_time = ktime_get();
/*
* Calculate memory used. This doesn't include invisible
* overhead due to kernel allocator fragment size rounding.
*/
bytes_requested = sizeof(*stream);
actual_bytes_used = ksize(stream);
total_string_length = 0;
list_for_each_entry(frag_container, &stream->fragments, node) {
bytes_requested += sizeof(*frag_container);
actual_bytes_used += ksize(frag_container);
len = strlen(frag_container->fragment);
total_string_length += len;
bytes_requested += len + 1; /* +1 for '\0' */
actual_bytes_used += ksize(frag_container->fragment);
}
kunit_info(test, "Time elapsed: %lld us\n",
ktime_us_delta(end_time, start_time));
kunit_info(test, "Total string length: %zu\n", total_string_length);
kunit_info(test, "Bytes requested: %zu\n", bytes_requested);
kunit_info(test, "Actual bytes allocated: %zu\n", actual_bytes_used);
}
static int string_stream_test_init(struct kunit *test)
{
struct string_stream_test_priv *priv;
priv = kunit_kzalloc(test, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
test->priv = priv;
return 0;
}
static struct kunit_case string_stream_test_cases[] = {
KUNIT_CASE(string_stream_managed_init_test),
KUNIT_CASE(string_stream_unmanaged_init_test),
KUNIT_CASE(string_stream_managed_free_test),
KUNIT_CASE(string_stream_resource_free_test),
KUNIT_CASE(string_stream_line_add_test),
KUNIT_CASE(string_stream_variable_length_line_test),
KUNIT_CASE(string_stream_append_test),
KUNIT_CASE(string_stream_append_auto_newline_test),
KUNIT_CASE(string_stream_append_empty_string_test),
KUNIT_CASE(string_stream_no_auto_newline_test),
KUNIT_CASE(string_stream_auto_newline_test),
KUNIT_CASE(string_stream_performance_test),
{}
};
static struct kunit_suite string_stream_test_suite = {
.name = "string-stream-test",
.test_cases = string_stream_test_cases,
.init = string_stream_test_init,
};
kunit_test_suites(&string_stream_test_suite);
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