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// SPDX-License-Identifier: GPL-2.0
#include <linux/debugfs.h>
#include "netdevsim.h"
#define NSIM_DEV_HWSTATS_TRAFFIC_MS 100
static struct list_head *
nsim_dev_hwstats_get_list_head(struct nsim_dev_hwstats *hwstats,
enum netdev_offload_xstats_type type)
{
switch (type) {
case NETDEV_OFFLOAD_XSTATS_TYPE_L3:
return &hwstats->l3_list;
}
WARN_ON_ONCE(1);
return NULL;
}
static void nsim_dev_hwstats_traffic_bump(struct nsim_dev_hwstats *hwstats,
enum netdev_offload_xstats_type type)
{
struct nsim_dev_hwstats_netdev *hwsdev;
struct list_head *hwsdev_list;
hwsdev_list = nsim_dev_hwstats_get_list_head(hwstats, type);
if (WARN_ON(!hwsdev_list))
return;
list_for_each_entry(hwsdev, hwsdev_list, list) {
if (hwsdev->enabled) {
hwsdev->stats.rx_packets += 1;
hwsdev->stats.tx_packets += 2;
hwsdev->stats.rx_bytes += 100;
hwsdev->stats.tx_bytes += 300;
}
}
}
static void nsim_dev_hwstats_traffic_work(struct work_struct *work)
{
struct nsim_dev_hwstats *hwstats;
hwstats = container_of(work, struct nsim_dev_hwstats, traffic_dw.work);
mutex_lock(&hwstats->hwsdev_list_lock);
nsim_dev_hwstats_traffic_bump(hwstats, NETDEV_OFFLOAD_XSTATS_TYPE_L3);
mutex_unlock(&hwstats->hwsdev_list_lock);
schedule_delayed_work(&hwstats->traffic_dw,
msecs_to_jiffies(NSIM_DEV_HWSTATS_TRAFFIC_MS));
}
static struct nsim_dev_hwstats_netdev *
nsim_dev_hwslist_find_hwsdev(struct list_head *hwsdev_list,
int ifindex)
{
struct nsim_dev_hwstats_netdev *hwsdev;
list_for_each_entry(hwsdev, hwsdev_list, list) {
if (hwsdev->netdev->ifindex == ifindex)
return hwsdev;
}
return NULL;
}
static int nsim_dev_hwsdev_enable(struct nsim_dev_hwstats_netdev *hwsdev,
struct netlink_ext_ack *extack)
{
if (hwsdev->fail_enable) {
hwsdev->fail_enable = false;
NL_SET_ERR_MSG_MOD(extack, "Stats enablement set to fail");
return -ECANCELED;
}
hwsdev->enabled = true;
return 0;
}
static void nsim_dev_hwsdev_disable(struct nsim_dev_hwstats_netdev *hwsdev)
{
hwsdev->enabled = false;
memset(&hwsdev->stats, 0, sizeof(hwsdev->stats));
}
static int
nsim_dev_hwsdev_report_delta(struct nsim_dev_hwstats_netdev *hwsdev,
struct netdev_notifier_offload_xstats_info *info)
{
netdev_offload_xstats_report_delta(info->report_delta, &hwsdev->stats);
memset(&hwsdev->stats, 0, sizeof(hwsdev->stats));
return 0;
}
static void
nsim_dev_hwsdev_report_used(struct nsim_dev_hwstats_netdev *hwsdev,
struct netdev_notifier_offload_xstats_info *info)
{
if (hwsdev->enabled)
netdev_offload_xstats_report_used(info->report_used);
}
static int nsim_dev_hwstats_event_off_xstats(struct nsim_dev_hwstats *hwstats,
struct net_device *dev,
unsigned long event, void *ptr)
{
struct netdev_notifier_offload_xstats_info *info;
struct nsim_dev_hwstats_netdev *hwsdev;
struct list_head *hwsdev_list;
int err = 0;
info = ptr;
hwsdev_list = nsim_dev_hwstats_get_list_head(hwstats, info->type);
if (!hwsdev_list)
return 0;
mutex_lock(&hwstats->hwsdev_list_lock);
hwsdev = nsim_dev_hwslist_find_hwsdev(hwsdev_list, dev->ifindex);
if (!hwsdev)
goto out;
switch (event) {
case NETDEV_OFFLOAD_XSTATS_ENABLE:
err = nsim_dev_hwsdev_enable(hwsdev, info->info.extack);
break;
case NETDEV_OFFLOAD_XSTATS_DISABLE:
nsim_dev_hwsdev_disable(hwsdev);
break;
case NETDEV_OFFLOAD_XSTATS_REPORT_USED:
nsim_dev_hwsdev_report_used(hwsdev, info);
break;
case NETDEV_OFFLOAD_XSTATS_REPORT_DELTA:
err = nsim_dev_hwsdev_report_delta(hwsdev, info);
break;
}
out:
mutex_unlock(&hwstats->hwsdev_list_lock);
return err;
}
static void nsim_dev_hwsdev_fini(struct nsim_dev_hwstats_netdev *hwsdev)
{
dev_put(hwsdev->netdev);
kfree(hwsdev);
}
static void
__nsim_dev_hwstats_event_unregister(struct nsim_dev_hwstats *hwstats,
struct net_device *dev,
enum netdev_offload_xstats_type type)
{
struct nsim_dev_hwstats_netdev *hwsdev;
struct list_head *hwsdev_list;
hwsdev_list = nsim_dev_hwstats_get_list_head(hwstats, type);
if (WARN_ON(!hwsdev_list))
return;
hwsdev = nsim_dev_hwslist_find_hwsdev(hwsdev_list, dev->ifindex);
if (!hwsdev)
return;
list_del(&hwsdev->list);
nsim_dev_hwsdev_fini(hwsdev);
}
static void nsim_dev_hwstats_event_unregister(struct nsim_dev_hwstats *hwstats,
struct net_device *dev)
{
mutex_lock(&hwstats->hwsdev_list_lock);
__nsim_dev_hwstats_event_unregister(hwstats, dev,
NETDEV_OFFLOAD_XSTATS_TYPE_L3);
mutex_unlock(&hwstats->hwsdev_list_lock);
}
static int nsim_dev_hwstats_event(struct nsim_dev_hwstats *hwstats,
struct net_device *dev,
unsigned long event, void *ptr)
{
switch (event) {
case NETDEV_OFFLOAD_XSTATS_ENABLE:
case NETDEV_OFFLOAD_XSTATS_DISABLE:
case NETDEV_OFFLOAD_XSTATS_REPORT_USED:
case NETDEV_OFFLOAD_XSTATS_REPORT_DELTA:
return nsim_dev_hwstats_event_off_xstats(hwstats, dev,
event, ptr);
case NETDEV_UNREGISTER:
nsim_dev_hwstats_event_unregister(hwstats, dev);
break;
}
return 0;
}
static int nsim_dev_netdevice_event(struct notifier_block *nb,
unsigned long event, void *ptr)
{
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
struct nsim_dev_hwstats *hwstats;
int err = 0;
hwstats = container_of(nb, struct nsim_dev_hwstats, netdevice_nb);
err = nsim_dev_hwstats_event(hwstats, dev, event, ptr);
if (err)
return notifier_from_errno(err);
return NOTIFY_OK;
}
static int
nsim_dev_hwstats_enable_ifindex(struct nsim_dev_hwstats *hwstats,
int ifindex,
enum netdev_offload_xstats_type type,
struct list_head *hwsdev_list)
{
struct nsim_dev_hwstats_netdev *hwsdev;
struct nsim_dev *nsim_dev;
struct net_device *netdev;
bool notify = false;
struct net *net;
int err = 0;
nsim_dev = container_of(hwstats, struct nsim_dev, hwstats);
net = nsim_dev_net(nsim_dev);
rtnl_lock();
mutex_lock(&hwstats->hwsdev_list_lock);
hwsdev = nsim_dev_hwslist_find_hwsdev(hwsdev_list, ifindex);
if (hwsdev)
goto out_unlock_list;
netdev = dev_get_by_index(net, ifindex);
if (!netdev) {
err = -ENODEV;
goto out_unlock_list;
}
hwsdev = kzalloc(sizeof(*hwsdev), GFP_KERNEL);
if (!hwsdev) {
err = -ENOMEM;
goto out_put_netdev;
}
hwsdev->netdev = netdev;
list_add_tail(&hwsdev->list, hwsdev_list);
mutex_unlock(&hwstats->hwsdev_list_lock);
if (netdev_offload_xstats_enabled(netdev, type)) {
nsim_dev_hwsdev_enable(hwsdev, NULL);
notify = true;
}
if (notify)
rtnl_offload_xstats_notify(netdev);
rtnl_unlock();
return err;
out_put_netdev:
dev_put(netdev);
out_unlock_list:
mutex_unlock(&hwstats->hwsdev_list_lock);
rtnl_unlock();
return err;
}
static int
nsim_dev_hwstats_disable_ifindex(struct nsim_dev_hwstats *hwstats,
int ifindex,
enum netdev_offload_xstats_type type,
struct list_head *hwsdev_list)
{
struct nsim_dev_hwstats_netdev *hwsdev;
int err = 0;
rtnl_lock();
mutex_lock(&hwstats->hwsdev_list_lock);
hwsdev = nsim_dev_hwslist_find_hwsdev(hwsdev_list, ifindex);
if (hwsdev)
list_del(&hwsdev->list);
mutex_unlock(&hwstats->hwsdev_list_lock);
if (!hwsdev) {
err = -ENOENT;
goto unlock_out;
}
if (netdev_offload_xstats_enabled(hwsdev->netdev, type)) {
netdev_offload_xstats_push_delta(hwsdev->netdev, type,
&hwsdev->stats);
rtnl_offload_xstats_notify(hwsdev->netdev);
}
nsim_dev_hwsdev_fini(hwsdev);
unlock_out:
rtnl_unlock();
return err;
}
static int
nsim_dev_hwstats_fail_ifindex(struct nsim_dev_hwstats *hwstats,
int ifindex,
enum netdev_offload_xstats_type type,
struct list_head *hwsdev_list)
{
struct nsim_dev_hwstats_netdev *hwsdev;
int err = 0;
mutex_lock(&hwstats->hwsdev_list_lock);
hwsdev = nsim_dev_hwslist_find_hwsdev(hwsdev_list, ifindex);
if (!hwsdev) {
err = -ENOENT;
goto err_hwsdev_list_unlock;
}
hwsdev->fail_enable = true;
err_hwsdev_list_unlock:
mutex_unlock(&hwstats->hwsdev_list_lock);
return err;
}
enum nsim_dev_hwstats_do {
NSIM_DEV_HWSTATS_DO_DISABLE,
NSIM_DEV_HWSTATS_DO_ENABLE,
NSIM_DEV_HWSTATS_DO_FAIL,
};
struct nsim_dev_hwstats_fops {
const struct file_operations fops;
enum nsim_dev_hwstats_do action;
enum netdev_offload_xstats_type type;
};
static ssize_t
nsim_dev_hwstats_do_write(struct file *file,
const char __user *data,
size_t count, loff_t *ppos)
{
struct nsim_dev_hwstats *hwstats = file->private_data;
struct nsim_dev_hwstats_fops *hwsfops;
struct list_head *hwsdev_list;
int ifindex;
int err;
hwsfops = container_of(debugfs_real_fops(file),
struct nsim_dev_hwstats_fops, fops);
err = kstrtoint_from_user(data, count, 0, &ifindex);
if (err)
return err;
hwsdev_list = nsim_dev_hwstats_get_list_head(hwstats, hwsfops->type);
if (WARN_ON(!hwsdev_list))
return -EINVAL;
switch (hwsfops->action) {
case NSIM_DEV_HWSTATS_DO_DISABLE:
err = nsim_dev_hwstats_disable_ifindex(hwstats, ifindex,
hwsfops->type,
hwsdev_list);
break;
case NSIM_DEV_HWSTATS_DO_ENABLE:
err = nsim_dev_hwstats_enable_ifindex(hwstats, ifindex,
hwsfops->type,
hwsdev_list);
break;
case NSIM_DEV_HWSTATS_DO_FAIL:
err = nsim_dev_hwstats_fail_ifindex(hwstats, ifindex,
hwsfops->type,
hwsdev_list);
break;
}
if (err)
return err;
return count;
}
#define NSIM_DEV_HWSTATS_FOPS(ACTION, TYPE) \
{ \
.fops = { \
.open = simple_open, \
.write = nsim_dev_hwstats_do_write, \
.llseek = generic_file_llseek, \
.owner = THIS_MODULE, \
}, \
.action = ACTION, \
.type = TYPE, \
}
static const struct nsim_dev_hwstats_fops nsim_dev_hwstats_l3_disable_fops =
NSIM_DEV_HWSTATS_FOPS(NSIM_DEV_HWSTATS_DO_DISABLE,
NETDEV_OFFLOAD_XSTATS_TYPE_L3);
static const struct nsim_dev_hwstats_fops nsim_dev_hwstats_l3_enable_fops =
NSIM_DEV_HWSTATS_FOPS(NSIM_DEV_HWSTATS_DO_ENABLE,
NETDEV_OFFLOAD_XSTATS_TYPE_L3);
static const struct nsim_dev_hwstats_fops nsim_dev_hwstats_l3_fail_fops =
NSIM_DEV_HWSTATS_FOPS(NSIM_DEV_HWSTATS_DO_FAIL,
NETDEV_OFFLOAD_XSTATS_TYPE_L3);
#undef NSIM_DEV_HWSTATS_FOPS
int nsim_dev_hwstats_init(struct nsim_dev *nsim_dev)
{
struct nsim_dev_hwstats *hwstats = &nsim_dev->hwstats;
struct net *net = nsim_dev_net(nsim_dev);
int err;
mutex_init(&hwstats->hwsdev_list_lock);
INIT_LIST_HEAD(&hwstats->l3_list);
hwstats->netdevice_nb.notifier_call = nsim_dev_netdevice_event;
err = register_netdevice_notifier_net(net, &hwstats->netdevice_nb);
if (err)
goto err_mutex_destroy;
hwstats->ddir = debugfs_create_dir("hwstats", nsim_dev->ddir);
if (IS_ERR(hwstats->ddir)) {
err = PTR_ERR(hwstats->ddir);
goto err_unregister_notifier;
}
hwstats->l3_ddir = debugfs_create_dir("l3", hwstats->ddir);
if (IS_ERR(hwstats->l3_ddir)) {
err = PTR_ERR(hwstats->l3_ddir);
goto err_remove_hwstats_recursive;
}
debugfs_create_file("enable_ifindex", 0200, hwstats->l3_ddir, hwstats,
&nsim_dev_hwstats_l3_enable_fops.fops);
debugfs_create_file("disable_ifindex", 0200, hwstats->l3_ddir, hwstats,
&nsim_dev_hwstats_l3_disable_fops.fops);
debugfs_create_file("fail_next_enable", 0200, hwstats->l3_ddir, hwstats,
&nsim_dev_hwstats_l3_fail_fops.fops);
INIT_DELAYED_WORK(&hwstats->traffic_dw,
&nsim_dev_hwstats_traffic_work);
schedule_delayed_work(&hwstats->traffic_dw,
msecs_to_jiffies(NSIM_DEV_HWSTATS_TRAFFIC_MS));
return 0;
err_remove_hwstats_recursive:
debugfs_remove_recursive(hwstats->ddir);
err_unregister_notifier:
unregister_netdevice_notifier_net(net, &hwstats->netdevice_nb);
err_mutex_destroy:
mutex_destroy(&hwstats->hwsdev_list_lock);
return err;
}
static void nsim_dev_hwsdev_list_wipe(struct nsim_dev_hwstats *hwstats,
enum netdev_offload_xstats_type type)
{
struct nsim_dev_hwstats_netdev *hwsdev, *tmp;
struct list_head *hwsdev_list;
hwsdev_list = nsim_dev_hwstats_get_list_head(hwstats, type);
if (WARN_ON(!hwsdev_list))
return;
mutex_lock(&hwstats->hwsdev_list_lock);
list_for_each_entry_safe(hwsdev, tmp, hwsdev_list, list) {
list_del(&hwsdev->list);
nsim_dev_hwsdev_fini(hwsdev);
}
mutex_unlock(&hwstats->hwsdev_list_lock);
}
void nsim_dev_hwstats_exit(struct nsim_dev *nsim_dev)
{
struct nsim_dev_hwstats *hwstats = &nsim_dev->hwstats;
struct net *net = nsim_dev_net(nsim_dev);
cancel_delayed_work_sync(&hwstats->traffic_dw);
debugfs_remove_recursive(hwstats->ddir);
unregister_netdevice_notifier_net(net, &hwstats->netdevice_nb);
nsim_dev_hwsdev_list_wipe(hwstats, NETDEV_OFFLOAD_XSTATS_TYPE_L3);
mutex_destroy(&hwstats->hwsdev_list_lock);
}
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