Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 486 insertions, 0 deletions

diff --git a/drivers/net/netdevsim/hwstats.c b/drivers/net/netdevsim/hwstats.c
new file mode 100644
index 0000000000..0e58aa7f03
--- /dev/null
+++ b/drivers/net/netdevsim/hwstats.c
@@ -0,0 +1,486 @@
+// 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);
+}