Revision 5f4fc6d440d77a2cf74fe4ea56955674ac7e35e7 authored by Linus Torvalds on 19 July 2019, 17:06:06 UTC, committed by Linus Torvalds on 19 July 2019, 17:06:06 UTC
Pull networking fixes from David Miller: 1) Fix AF_XDP cq entry leak, from Ilya Maximets. 2) Fix handling of PHY power-down on RTL8411B, from Heiner Kallweit. 3) Add some new PCI IDs to iwlwifi, from Ihab Zhaika. 4) Fix handling of neigh timers wrt. entries added by userspace, from Lorenzo Bianconi. 5) Various cases of missing of_node_put(), from Nishka Dasgupta. 6) The new NET_ACT_CT needs to depend upon NF_NAT, from Yue Haibing. 7) Various RDS layer fixes, from Gerd Rausch. 8) Fix some more fallout from TCQ_F_CAN_BYPASS generalization, from Cong Wang. 9) Fix FIB source validation checks over loopback, also from Cong Wang. 10) Use promisc for unsupported number of filters, from Justin Chen. 11) Missing sibling route unlink on failure in ipv6, from Ido Schimmel. * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (90 commits) tcp: fix tcp_set_congestion_control() use from bpf hook ag71xx: fix return value check in ag71xx_probe() ag71xx: fix error return code in ag71xx_probe() usb: qmi_wwan: add D-Link DWM-222 A2 device ID bnxt_en: Fix VNIC accounting when enabling aRFS on 57500 chips. net: dsa: sja1105: Fix missing unlock on error in sk_buff() gve: replace kfree with kvfree selftests/bpf: fix test_xdp_noinline on s390 selftests/bpf: fix "valid read map access into a read-only array 1" on s390 net/mlx5: Replace kfree with kvfree MAINTAINERS: update netsec driver ipv6: Unlink sibling route in case of failure liquidio: Replace vmalloc + memset with vzalloc udp: Fix typo in net/ipv4/udp.c net: bcmgenet: use promisc for unsupported filters ipv6: rt6_check should return NULL if 'from' is NULL tipc: initialize 'validated' field of received packets selftests: add a test case for rp_filter fib: relax source validation check for loopback packets mlxsw: spectrum: Do not process learned records with a dummy FID ...
test_kmod.c
/*
* kmod stress test driver
*
* Copyright (C) 2017 Luis R. Rodriguez <mcgrof@kernel.org>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or at your option any
* later version; or, when distributed separately from the Linux kernel or
* when incorporated into other software packages, subject to the following
* license:
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of copyleft-next (version 0.3.1 or later) as published
* at http://copyleft-next.org/.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
/*
* This driver provides an interface to trigger and test the kernel's
* module loader through a series of configurations and a few triggers.
* To test this driver use the following script as root:
*
* tools/testing/selftests/kmod/kmod.sh --help
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/kmod.h>
#include <linux/printk.h>
#include <linux/kthread.h>
#include <linux/sched.h>
#include <linux/fs.h>
#include <linux/miscdevice.h>
#include <linux/vmalloc.h>
#include <linux/slab.h>
#include <linux/device.h>
#define TEST_START_NUM_THREADS 50
#define TEST_START_DRIVER "test_module"
#define TEST_START_TEST_FS "xfs"
#define TEST_START_TEST_CASE TEST_KMOD_DRIVER
static bool force_init_test = false;
module_param(force_init_test, bool_enable_only, 0644);
MODULE_PARM_DESC(force_init_test,
"Force kicking a test immediately after driver loads");
/*
* For device allocation / registration
*/
static DEFINE_MUTEX(reg_dev_mutex);
static LIST_HEAD(reg_test_devs);
/*
* num_test_devs actually represents the *next* ID of the next
* device we will allow to create.
*/
static int num_test_devs;
/**
* enum kmod_test_case - linker table test case
*
* If you add a test case, please be sure to review if you need to se
* @need_mod_put for your tests case.
*
* @TEST_KMOD_DRIVER: stress tests request_module()
* @TEST_KMOD_FS_TYPE: stress tests get_fs_type()
*/
enum kmod_test_case {
__TEST_KMOD_INVALID = 0,
TEST_KMOD_DRIVER,
TEST_KMOD_FS_TYPE,
__TEST_KMOD_MAX,
};
struct test_config {
char *test_driver;
char *test_fs;
unsigned int num_threads;
enum kmod_test_case test_case;
int test_result;
};
struct kmod_test_device;
/**
* kmod_test_device_info - thread info
*
* @ret_sync: return value if request_module() is used, sync request for
* @TEST_KMOD_DRIVER
* @fs_sync: return value of get_fs_type() for @TEST_KMOD_FS_TYPE
* @thread_idx: thread ID
* @test_dev: test device test is being performed under
* @need_mod_put: Some tests (get_fs_type() is one) requires putting the module
* (module_put(fs_sync->owner)) when done, otherwise you will not be able
* to unload the respective modules and re-test. We use this to keep
* accounting of when we need this and to help out in case we need to
* error out and deal with module_put() on error.
*/
struct kmod_test_device_info {
int ret_sync;
struct file_system_type *fs_sync;
struct task_struct *task_sync;
unsigned int thread_idx;
struct kmod_test_device *test_dev;
bool need_mod_put;
};
/**
* kmod_test_device - test device to help test kmod
*
* @dev_idx: unique ID for test device
* @config: configuration for the test
* @misc_dev: we use a misc device under the hood
* @dev: pointer to misc_dev's own struct device
* @config_mutex: protects configuration of test
* @trigger_mutex: the test trigger can only be fired once at a time
* @thread_lock: protects @done count, and the @info per each thread
* @done: number of threads which have completed or failed
* @test_is_oom: when we run out of memory, use this to halt moving forward
* @kthreads_done: completion used to signal when all work is done
* @list: needed to be part of the reg_test_devs
* @info: array of info for each thread
*/
struct kmod_test_device {
int dev_idx;
struct test_config config;
struct miscdevice misc_dev;
struct device *dev;
struct mutex config_mutex;
struct mutex trigger_mutex;
struct mutex thread_mutex;
unsigned int done;
bool test_is_oom;
struct completion kthreads_done;
struct list_head list;
struct kmod_test_device_info *info;
};
static const char *test_case_str(enum kmod_test_case test_case)
{
switch (test_case) {
case TEST_KMOD_DRIVER:
return "TEST_KMOD_DRIVER";
case TEST_KMOD_FS_TYPE:
return "TEST_KMOD_FS_TYPE";
default:
return "invalid";
}
}
static struct miscdevice *dev_to_misc_dev(struct device *dev)
{
return dev_get_drvdata(dev);
}
static struct kmod_test_device *misc_dev_to_test_dev(struct miscdevice *misc_dev)
{
return container_of(misc_dev, struct kmod_test_device, misc_dev);
}
static struct kmod_test_device *dev_to_test_dev(struct device *dev)
{
struct miscdevice *misc_dev;
misc_dev = dev_to_misc_dev(dev);
return misc_dev_to_test_dev(misc_dev);
}
/* Must run with thread_mutex held */
static void kmod_test_done_check(struct kmod_test_device *test_dev,
unsigned int idx)
{
struct test_config *config = &test_dev->config;
test_dev->done++;
dev_dbg(test_dev->dev, "Done thread count: %u\n", test_dev->done);
if (test_dev->done == config->num_threads) {
dev_info(test_dev->dev, "Done: %u threads have all run now\n",
test_dev->done);
dev_info(test_dev->dev, "Last thread to run: %u\n", idx);
complete(&test_dev->kthreads_done);
}
}
static void test_kmod_put_module(struct kmod_test_device_info *info)
{
struct kmod_test_device *test_dev = info->test_dev;
struct test_config *config = &test_dev->config;
if (!info->need_mod_put)
return;
switch (config->test_case) {
case TEST_KMOD_DRIVER:
break;
case TEST_KMOD_FS_TYPE:
if (info && info->fs_sync && info->fs_sync->owner)
module_put(info->fs_sync->owner);
break;
default:
BUG();
}
info->need_mod_put = true;
}
static int run_request(void *data)
{
struct kmod_test_device_info *info = data;
struct kmod_test_device *test_dev = info->test_dev;
struct test_config *config = &test_dev->config;
switch (config->test_case) {
case TEST_KMOD_DRIVER:
info->ret_sync = request_module("%s", config->test_driver);
break;
case TEST_KMOD_FS_TYPE:
info->fs_sync = get_fs_type(config->test_fs);
info->need_mod_put = true;
break;
default:
/* __trigger_config_run() already checked for test sanity */
BUG();
return -EINVAL;
}
dev_dbg(test_dev->dev, "Ran thread %u\n", info->thread_idx);
test_kmod_put_module(info);
mutex_lock(&test_dev->thread_mutex);
info->task_sync = NULL;
kmod_test_done_check(test_dev, info->thread_idx);
mutex_unlock(&test_dev->thread_mutex);
return 0;
}
static int tally_work_test(struct kmod_test_device_info *info)
{
struct kmod_test_device *test_dev = info->test_dev;
struct test_config *config = &test_dev->config;
int err_ret = 0;
switch (config->test_case) {
case TEST_KMOD_DRIVER:
/*
* Only capture errors, if one is found that's
* enough, for now.
*/
if (info->ret_sync != 0)
err_ret = info->ret_sync;
dev_info(test_dev->dev,
"Sync thread %d return status: %d\n",
info->thread_idx, info->ret_sync);
break;
case TEST_KMOD_FS_TYPE:
/* For now we make this simple */
if (!info->fs_sync)
err_ret = -EINVAL;
dev_info(test_dev->dev, "Sync thread %u fs: %s\n",
info->thread_idx, info->fs_sync ? config->test_fs :
"NULL");
break;
default:
BUG();
}
return err_ret;
}
/*
* XXX: add result option to display if all errors did not match.
* For now we just keep any error code if one was found.
*
* If this ran it means *all* tasks were created fine and we
* are now just collecting results.
*
* Only propagate errors, do not override with a subsequent sucess case.
*/
static void tally_up_work(struct kmod_test_device *test_dev)
{
struct test_config *config = &test_dev->config;
struct kmod_test_device_info *info;
unsigned int idx;
int err_ret = 0;
int ret = 0;
mutex_lock(&test_dev->thread_mutex);
dev_info(test_dev->dev, "Results:\n");
for (idx=0; idx < config->num_threads; idx++) {
info = &test_dev->info[idx];
ret = tally_work_test(info);
if (ret)
err_ret = ret;
}
/*
* Note: request_module() returns 256 for a module not found even
* though modprobe itself returns 1.
*/
config->test_result = err_ret;
mutex_unlock(&test_dev->thread_mutex);
}
static int try_one_request(struct kmod_test_device *test_dev, unsigned int idx)
{
struct kmod_test_device_info *info = &test_dev->info[idx];
int fail_ret = -ENOMEM;
mutex_lock(&test_dev->thread_mutex);
info->thread_idx = idx;
info->test_dev = test_dev;
info->task_sync = kthread_run(run_request, info, "%s-%u",
KBUILD_MODNAME, idx);
if (!info->task_sync || IS_ERR(info->task_sync)) {
test_dev->test_is_oom = true;
dev_err(test_dev->dev, "Setting up thread %u failed\n", idx);
info->task_sync = NULL;
goto err_out;
} else
dev_dbg(test_dev->dev, "Kicked off thread %u\n", idx);
mutex_unlock(&test_dev->thread_mutex);
return 0;
err_out:
info->ret_sync = fail_ret;
mutex_unlock(&test_dev->thread_mutex);
return fail_ret;
}
static void test_dev_kmod_stop_tests(struct kmod_test_device *test_dev)
{
struct test_config *config = &test_dev->config;
struct kmod_test_device_info *info;
unsigned int i;
dev_info(test_dev->dev, "Ending request_module() tests\n");
mutex_lock(&test_dev->thread_mutex);
for (i=0; i < config->num_threads; i++) {
info = &test_dev->info[i];
if (info->task_sync && !IS_ERR(info->task_sync)) {
dev_info(test_dev->dev,
"Stopping still-running thread %i\n", i);
kthread_stop(info->task_sync);
}
/*
* info->task_sync is well protected, it can only be
* NULL or a pointer to a struct. If its NULL we either
* never ran, or we did and we completed the work. Completed
* tasks *always* put the module for us. This is a sanity
* check -- just in case.
*/
if (info->task_sync && info->need_mod_put)
test_kmod_put_module(info);
}
mutex_unlock(&test_dev->thread_mutex);
}
/*
* Only wait *iff* we did not run into any errors during all of our thread
* set up. If run into any issues we stop threads and just bail out with
* an error to the trigger. This also means we don't need any tally work
* for any threads which fail.
*/
static int try_requests(struct kmod_test_device *test_dev)
{
struct test_config *config = &test_dev->config;
unsigned int idx;
int ret;
bool any_error = false;
for (idx=0; idx < config->num_threads; idx++) {
if (test_dev->test_is_oom) {
any_error = true;
break;
}
ret = try_one_request(test_dev, idx);
if (ret) {
any_error = true;
break;
}
}
if (!any_error) {
test_dev->test_is_oom = false;
dev_info(test_dev->dev,
"No errors were found while initializing threads\n");
wait_for_completion(&test_dev->kthreads_done);
tally_up_work(test_dev);
} else {
test_dev->test_is_oom = true;
dev_info(test_dev->dev,
"At least one thread failed to start, stop all work\n");
test_dev_kmod_stop_tests(test_dev);
return -ENOMEM;
}
return 0;
}
static int run_test_driver(struct kmod_test_device *test_dev)
{
struct test_config *config = &test_dev->config;
dev_info(test_dev->dev, "Test case: %s (%u)\n",
test_case_str(config->test_case),
config->test_case);
dev_info(test_dev->dev, "Test driver to load: %s\n",
config->test_driver);
dev_info(test_dev->dev, "Number of threads to run: %u\n",
config->num_threads);
dev_info(test_dev->dev, "Thread IDs will range from 0 - %u\n",
config->num_threads - 1);
return try_requests(test_dev);
}
static int run_test_fs_type(struct kmod_test_device *test_dev)
{
struct test_config *config = &test_dev->config;
dev_info(test_dev->dev, "Test case: %s (%u)\n",
test_case_str(config->test_case),
config->test_case);
dev_info(test_dev->dev, "Test filesystem to load: %s\n",
config->test_fs);
dev_info(test_dev->dev, "Number of threads to run: %u\n",
config->num_threads);
dev_info(test_dev->dev, "Thread IDs will range from 0 - %u\n",
config->num_threads - 1);
return try_requests(test_dev);
}
static ssize_t config_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct kmod_test_device *test_dev = dev_to_test_dev(dev);
struct test_config *config = &test_dev->config;
int len = 0;
mutex_lock(&test_dev->config_mutex);
len += snprintf(buf, PAGE_SIZE,
"Custom trigger configuration for: %s\n",
dev_name(dev));
len += snprintf(buf+len, PAGE_SIZE - len,
"Number of threads:\t%u\n",
config->num_threads);
len += snprintf(buf+len, PAGE_SIZE - len,
"Test_case:\t%s (%u)\n",
test_case_str(config->test_case),
config->test_case);
if (config->test_driver)
len += snprintf(buf+len, PAGE_SIZE - len,
"driver:\t%s\n",
config->test_driver);
else
len += snprintf(buf+len, PAGE_SIZE - len,
"driver:\tEMPTY\n");
if (config->test_fs)
len += snprintf(buf+len, PAGE_SIZE - len,
"fs:\t%s\n",
config->test_fs);
else
len += snprintf(buf+len, PAGE_SIZE - len,
"fs:\tEMPTY\n");
mutex_unlock(&test_dev->config_mutex);
return len;
}
static DEVICE_ATTR_RO(config);
/*
* This ensures we don't allow kicking threads through if our configuration
* is faulty.
*/
static int __trigger_config_run(struct kmod_test_device *test_dev)
{
struct test_config *config = &test_dev->config;
test_dev->done = 0;
switch (config->test_case) {
case TEST_KMOD_DRIVER:
return run_test_driver(test_dev);
case TEST_KMOD_FS_TYPE:
return run_test_fs_type(test_dev);
default:
dev_warn(test_dev->dev,
"Invalid test case requested: %u\n",
config->test_case);
return -EINVAL;
}
}
static int trigger_config_run(struct kmod_test_device *test_dev)
{
struct test_config *config = &test_dev->config;
int ret;
mutex_lock(&test_dev->trigger_mutex);
mutex_lock(&test_dev->config_mutex);
ret = __trigger_config_run(test_dev);
if (ret < 0)
goto out;
dev_info(test_dev->dev, "General test result: %d\n",
config->test_result);
/*
* We must return 0 after a trigger even unless something went
* wrong with the setup of the test. If the test setup went fine
* then userspace must just check the result of config->test_result.
* One issue with relying on the return from a call in the kernel
* is if the kernel returns a possitive value using this trigger
* will not return the value to userspace, it would be lost.
*
* By not relying on capturing the return value of tests we are using
* through the trigger it also us to run tests with set -e and only
* fail when something went wrong with the driver upon trigger
* requests.
*/
ret = 0;
out:
mutex_unlock(&test_dev->config_mutex);
mutex_unlock(&test_dev->trigger_mutex);
return ret;
}
static ssize_t
trigger_config_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct kmod_test_device *test_dev = dev_to_test_dev(dev);
int ret;
if (test_dev->test_is_oom)
return -ENOMEM;
/* For all intents and purposes we don't care what userspace
* sent this trigger, we care only that we were triggered.
* We treat the return value only for caputuring issues with
* the test setup. At this point all the test variables should
* have been allocated so typically this should never fail.
*/
ret = trigger_config_run(test_dev);
if (unlikely(ret < 0))
goto out;
/*
* Note: any return > 0 will be treated as success
* and the error value will not be available to userspace.
* Do not rely on trying to send to userspace a test value
* return value as possitive return errors will be lost.
*/
if (WARN_ON(ret > 0))
return -EINVAL;
ret = count;
out:
return ret;
}
static DEVICE_ATTR_WO(trigger_config);
/*
* XXX: move to kstrncpy() once merged.
*
* Users should use kfree_const() when freeing these.
*/
static int __kstrncpy(char **dst, const char *name, size_t count, gfp_t gfp)
{
*dst = kstrndup(name, count, gfp);
if (!*dst)
return -ENOSPC;
return count;
}
static int config_copy_test_driver_name(struct test_config *config,
const char *name,
size_t count)
{
return __kstrncpy(&config->test_driver, name, count, GFP_KERNEL);
}
static int config_copy_test_fs(struct test_config *config, const char *name,
size_t count)
{
return __kstrncpy(&config->test_fs, name, count, GFP_KERNEL);
}
static void __kmod_config_free(struct test_config *config)
{
if (!config)
return;
kfree_const(config->test_driver);
config->test_driver = NULL;
kfree_const(config->test_fs);
config->test_fs = NULL;
}
static void kmod_config_free(struct kmod_test_device *test_dev)
{
struct test_config *config;
if (!test_dev)
return;
config = &test_dev->config;
mutex_lock(&test_dev->config_mutex);
__kmod_config_free(config);
mutex_unlock(&test_dev->config_mutex);
}
static ssize_t config_test_driver_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct kmod_test_device *test_dev = dev_to_test_dev(dev);
struct test_config *config = &test_dev->config;
int copied;
mutex_lock(&test_dev->config_mutex);
kfree_const(config->test_driver);
config->test_driver = NULL;
copied = config_copy_test_driver_name(config, buf, count);
mutex_unlock(&test_dev->config_mutex);
return copied;
}
/*
* As per sysfs_kf_seq_show() the buf is max PAGE_SIZE.
*/
static ssize_t config_test_show_str(struct mutex *config_mutex,
char *dst,
char *src)
{
int len;
mutex_lock(config_mutex);
len = snprintf(dst, PAGE_SIZE, "%s\n", src);
mutex_unlock(config_mutex);
return len;
}
static ssize_t config_test_driver_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct kmod_test_device *test_dev = dev_to_test_dev(dev);
struct test_config *config = &test_dev->config;
return config_test_show_str(&test_dev->config_mutex, buf,
config->test_driver);
}
static DEVICE_ATTR_RW(config_test_driver);
static ssize_t config_test_fs_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct kmod_test_device *test_dev = dev_to_test_dev(dev);
struct test_config *config = &test_dev->config;
int copied;
mutex_lock(&test_dev->config_mutex);
kfree_const(config->test_fs);
config->test_fs = NULL;
copied = config_copy_test_fs(config, buf, count);
mutex_unlock(&test_dev->config_mutex);
return copied;
}
static ssize_t config_test_fs_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct kmod_test_device *test_dev = dev_to_test_dev(dev);
struct test_config *config = &test_dev->config;
return config_test_show_str(&test_dev->config_mutex, buf,
config->test_fs);
}
static DEVICE_ATTR_RW(config_test_fs);
static int trigger_config_run_type(struct kmod_test_device *test_dev,
enum kmod_test_case test_case,
const char *test_str)
{
int copied = 0;
struct test_config *config = &test_dev->config;
mutex_lock(&test_dev->config_mutex);
switch (test_case) {
case TEST_KMOD_DRIVER:
kfree_const(config->test_driver);
config->test_driver = NULL;
copied = config_copy_test_driver_name(config, test_str,
strlen(test_str));
break;
case TEST_KMOD_FS_TYPE:
kfree_const(config->test_fs);
config->test_driver = NULL;
copied = config_copy_test_fs(config, test_str,
strlen(test_str));
break;
default:
mutex_unlock(&test_dev->config_mutex);
return -EINVAL;
}
config->test_case = test_case;
mutex_unlock(&test_dev->config_mutex);
if (copied <= 0 || copied != strlen(test_str)) {
test_dev->test_is_oom = true;
return -ENOMEM;
}
test_dev->test_is_oom = false;
return trigger_config_run(test_dev);
}
static void free_test_dev_info(struct kmod_test_device *test_dev)
{
vfree(test_dev->info);
test_dev->info = NULL;
}
static int kmod_config_sync_info(struct kmod_test_device *test_dev)
{
struct test_config *config = &test_dev->config;
free_test_dev_info(test_dev);
test_dev->info =
vzalloc(array_size(sizeof(struct kmod_test_device_info),
config->num_threads));
if (!test_dev->info)
return -ENOMEM;
return 0;
}
/*
* Old kernels may not have this, if you want to port this code to
* test it on older kernels.
*/
#ifdef get_kmod_umh_limit
static unsigned int kmod_init_test_thread_limit(void)
{
return get_kmod_umh_limit();
}
#else
static unsigned int kmod_init_test_thread_limit(void)
{
return TEST_START_NUM_THREADS;
}
#endif
static int __kmod_config_init(struct kmod_test_device *test_dev)
{
struct test_config *config = &test_dev->config;
int ret = -ENOMEM, copied;
__kmod_config_free(config);
copied = config_copy_test_driver_name(config, TEST_START_DRIVER,
strlen(TEST_START_DRIVER));
if (copied != strlen(TEST_START_DRIVER))
goto err_out;
copied = config_copy_test_fs(config, TEST_START_TEST_FS,
strlen(TEST_START_TEST_FS));
if (copied != strlen(TEST_START_TEST_FS))
goto err_out;
config->num_threads = kmod_init_test_thread_limit();
config->test_result = 0;
config->test_case = TEST_START_TEST_CASE;
ret = kmod_config_sync_info(test_dev);
if (ret)
goto err_out;
test_dev->test_is_oom = false;
return 0;
err_out:
test_dev->test_is_oom = true;
WARN_ON(test_dev->test_is_oom);
__kmod_config_free(config);
return ret;
}
static ssize_t reset_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct kmod_test_device *test_dev = dev_to_test_dev(dev);
int ret;
mutex_lock(&test_dev->trigger_mutex);
mutex_lock(&test_dev->config_mutex);
ret = __kmod_config_init(test_dev);
if (ret < 0) {
ret = -ENOMEM;
dev_err(dev, "could not alloc settings for config trigger: %d\n",
ret);
goto out;
}
dev_info(dev, "reset\n");
ret = count;
out:
mutex_unlock(&test_dev->config_mutex);
mutex_unlock(&test_dev->trigger_mutex);
return ret;
}
static DEVICE_ATTR_WO(reset);
static int test_dev_config_update_uint_sync(struct kmod_test_device *test_dev,
const char *buf, size_t size,
unsigned int *config,
int (*test_sync)(struct kmod_test_device *test_dev))
{
int ret;
unsigned long new;
unsigned int old_val;
ret = kstrtoul(buf, 10, &new);
if (ret)
return ret;
if (new > UINT_MAX)
return -EINVAL;
mutex_lock(&test_dev->config_mutex);
old_val = *config;
*(unsigned int *)config = new;
ret = test_sync(test_dev);
if (ret) {
*(unsigned int *)config = old_val;
ret = test_sync(test_dev);
WARN_ON(ret);
mutex_unlock(&test_dev->config_mutex);
return -EINVAL;
}
mutex_unlock(&test_dev->config_mutex);
/* Always return full write size even if we didn't consume all */
return size;
}
static int test_dev_config_update_uint_range(struct kmod_test_device *test_dev,
const char *buf, size_t size,
unsigned int *config,
unsigned int min,
unsigned int max)
{
int ret;
unsigned long new;
ret = kstrtoul(buf, 10, &new);
if (ret)
return ret;
if (new < min || new > max)
return -EINVAL;
mutex_lock(&test_dev->config_mutex);
*config = new;
mutex_unlock(&test_dev->config_mutex);
/* Always return full write size even if we didn't consume all */
return size;
}
static int test_dev_config_update_int(struct kmod_test_device *test_dev,
const char *buf, size_t size,
int *config)
{
int ret;
long new;
ret = kstrtol(buf, 10, &new);
if (ret)
return ret;
if (new < INT_MIN || new > INT_MAX)
return -EINVAL;
mutex_lock(&test_dev->config_mutex);
*config = new;
mutex_unlock(&test_dev->config_mutex);
/* Always return full write size even if we didn't consume all */
return size;
}
static ssize_t test_dev_config_show_int(struct kmod_test_device *test_dev,
char *buf,
int config)
{
int val;
mutex_lock(&test_dev->config_mutex);
val = config;
mutex_unlock(&test_dev->config_mutex);
return snprintf(buf, PAGE_SIZE, "%d\n", val);
}
static ssize_t test_dev_config_show_uint(struct kmod_test_device *test_dev,
char *buf,
unsigned int config)
{
unsigned int val;
mutex_lock(&test_dev->config_mutex);
val = config;
mutex_unlock(&test_dev->config_mutex);
return snprintf(buf, PAGE_SIZE, "%u\n", val);
}
static ssize_t test_result_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct kmod_test_device *test_dev = dev_to_test_dev(dev);
struct test_config *config = &test_dev->config;
return test_dev_config_update_int(test_dev, buf, count,
&config->test_result);
}
static ssize_t config_num_threads_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct kmod_test_device *test_dev = dev_to_test_dev(dev);
struct test_config *config = &test_dev->config;
return test_dev_config_update_uint_sync(test_dev, buf, count,
&config->num_threads,
kmod_config_sync_info);
}
static ssize_t config_num_threads_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct kmod_test_device *test_dev = dev_to_test_dev(dev);
struct test_config *config = &test_dev->config;
return test_dev_config_show_int(test_dev, buf, config->num_threads);
}
static DEVICE_ATTR_RW(config_num_threads);
static ssize_t config_test_case_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct kmod_test_device *test_dev = dev_to_test_dev(dev);
struct test_config *config = &test_dev->config;
return test_dev_config_update_uint_range(test_dev, buf, count,
&config->test_case,
__TEST_KMOD_INVALID + 1,
__TEST_KMOD_MAX - 1);
}
static ssize_t config_test_case_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct kmod_test_device *test_dev = dev_to_test_dev(dev);
struct test_config *config = &test_dev->config;
return test_dev_config_show_uint(test_dev, buf, config->test_case);
}
static DEVICE_ATTR_RW(config_test_case);
static ssize_t test_result_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct kmod_test_device *test_dev = dev_to_test_dev(dev);
struct test_config *config = &test_dev->config;
return test_dev_config_show_int(test_dev, buf, config->test_result);
}
static DEVICE_ATTR_RW(test_result);
#define TEST_KMOD_DEV_ATTR(name) &dev_attr_##name.attr
static struct attribute *test_dev_attrs[] = {
TEST_KMOD_DEV_ATTR(trigger_config),
TEST_KMOD_DEV_ATTR(config),
TEST_KMOD_DEV_ATTR(reset),
TEST_KMOD_DEV_ATTR(config_test_driver),
TEST_KMOD_DEV_ATTR(config_test_fs),
TEST_KMOD_DEV_ATTR(config_num_threads),
TEST_KMOD_DEV_ATTR(config_test_case),
TEST_KMOD_DEV_ATTR(test_result),
NULL,
};
ATTRIBUTE_GROUPS(test_dev);
static int kmod_config_init(struct kmod_test_device *test_dev)
{
int ret;
mutex_lock(&test_dev->config_mutex);
ret = __kmod_config_init(test_dev);
mutex_unlock(&test_dev->config_mutex);
return ret;
}
static struct kmod_test_device *alloc_test_dev_kmod(int idx)
{
int ret;
struct kmod_test_device *test_dev;
struct miscdevice *misc_dev;
test_dev = vzalloc(sizeof(struct kmod_test_device));
if (!test_dev)
goto err_out;
mutex_init(&test_dev->config_mutex);
mutex_init(&test_dev->trigger_mutex);
mutex_init(&test_dev->thread_mutex);
init_completion(&test_dev->kthreads_done);
ret = kmod_config_init(test_dev);
if (ret < 0) {
pr_err("Cannot alloc kmod_config_init()\n");
goto err_out_free;
}
test_dev->dev_idx = idx;
misc_dev = &test_dev->misc_dev;
misc_dev->minor = MISC_DYNAMIC_MINOR;
misc_dev->name = kasprintf(GFP_KERNEL, "test_kmod%d", idx);
if (!misc_dev->name) {
pr_err("Cannot alloc misc_dev->name\n");
goto err_out_free_config;
}
misc_dev->groups = test_dev_groups;
return test_dev;
err_out_free_config:
free_test_dev_info(test_dev);
kmod_config_free(test_dev);
err_out_free:
vfree(test_dev);
test_dev = NULL;
err_out:
return NULL;
}
static void free_test_dev_kmod(struct kmod_test_device *test_dev)
{
if (test_dev) {
kfree_const(test_dev->misc_dev.name);
test_dev->misc_dev.name = NULL;
free_test_dev_info(test_dev);
kmod_config_free(test_dev);
vfree(test_dev);
test_dev = NULL;
}
}
static struct kmod_test_device *register_test_dev_kmod(void)
{
struct kmod_test_device *test_dev = NULL;
int ret;
mutex_lock(®_dev_mutex);
/* int should suffice for number of devices, test for wrap */
if (num_test_devs + 1 == INT_MAX) {
pr_err("reached limit of number of test devices\n");
goto out;
}
test_dev = alloc_test_dev_kmod(num_test_devs);
if (!test_dev)
goto out;
ret = misc_register(&test_dev->misc_dev);
if (ret) {
pr_err("could not register misc device: %d\n", ret);
free_test_dev_kmod(test_dev);
goto out;
}
test_dev->dev = test_dev->misc_dev.this_device;
list_add_tail(&test_dev->list, ®_test_devs);
dev_info(test_dev->dev, "interface ready\n");
num_test_devs++;
out:
mutex_unlock(®_dev_mutex);
return test_dev;
}
static int __init test_kmod_init(void)
{
struct kmod_test_device *test_dev;
int ret;
test_dev = register_test_dev_kmod();
if (!test_dev) {
pr_err("Cannot add first test kmod device\n");
return -ENODEV;
}
/*
* With some work we might be able to gracefully enable
* testing with this driver built-in, for now this seems
* rather risky. For those willing to try have at it,
* and enable the below. Good luck! If that works, try
* lowering the init level for more fun.
*/
if (force_init_test) {
ret = trigger_config_run_type(test_dev,
TEST_KMOD_DRIVER, "tun");
if (WARN_ON(ret))
return ret;
ret = trigger_config_run_type(test_dev,
TEST_KMOD_FS_TYPE, "btrfs");
if (WARN_ON(ret))
return ret;
}
return 0;
}
late_initcall(test_kmod_init);
static
void unregister_test_dev_kmod(struct kmod_test_device *test_dev)
{
mutex_lock(&test_dev->trigger_mutex);
mutex_lock(&test_dev->config_mutex);
test_dev_kmod_stop_tests(test_dev);
dev_info(test_dev->dev, "removing interface\n");
misc_deregister(&test_dev->misc_dev);
mutex_unlock(&test_dev->config_mutex);
mutex_unlock(&test_dev->trigger_mutex);
free_test_dev_kmod(test_dev);
}
static void __exit test_kmod_exit(void)
{
struct kmod_test_device *test_dev, *tmp;
mutex_lock(®_dev_mutex);
list_for_each_entry_safe(test_dev, tmp, ®_test_devs, list) {
list_del(&test_dev->list);
unregister_test_dev_kmod(test_dev);
}
mutex_unlock(®_dev_mutex);
}
module_exit(test_kmod_exit);
MODULE_AUTHOR("Luis R. Rodriguez <mcgrof@kernel.org>");
MODULE_LICENSE("GPL");
![swh spinner](/static/img/swh-spinner.gif)
Computing file changes ...