path: root/drivers/net/netdevsim/dev.c

/*
 * Copyright (c) 2018 Cumulus Networks. All rights reserved.
 * Copyright (c) 2018 David Ahern <dsa@cumulusnetworks.com>
 * Copyright (c) 2019 Mellanox Technologies. All rights reserved.
 *
 * This software is licensed under the GNU General License Version 2,
 * June 1991 as shown in the file COPYING in the top-level directory of this
 * source tree.
 *
 * THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS"
 * WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE
 * OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME
 * THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
 */

#include <linux/debugfs.h>
#include <linux/device.h>
#include <linux/etherdevice.h>
#include <linux/inet.h>
#include <linux/jiffies.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/random.h>
#include <linux/rtnetlink.h>
#include <linux/workqueue.h>
#include <net/devlink.h>
#include <net/ip.h>
#include <net/flow_offload.h>
#include <uapi/linux/devlink.h>
#include <uapi/linux/ip.h>
#include <uapi/linux/udp.h>

#include "netdevsim.h"

static struct dentry *nsim_dev_ddir;

#define NSIM_DEV_DUMMY_REGION_SIZE (1024 * 32)

static int
nsim_dev_take_snapshot(struct devlink *devlink, struct netlink_ext_ack *extack,
		       u8 **data)
{
	void *dummy_data;

	dummy_data = kmalloc(NSIM_DEV_DUMMY_REGION_SIZE, GFP_KERNEL);
	if (!dummy_data)
		return -ENOMEM;

	get_random_bytes(dummy_data, NSIM_DEV_DUMMY_REGION_SIZE);

	*data = dummy_data;

	return 0;
}

static ssize_t nsim_dev_take_snapshot_write(struct file *file,
					    const char __user *data,
					    size_t count, loff_t *ppos)
{
	struct nsim_dev *nsim_dev = file->private_data;
	struct devlink *devlink;
	u8 *dummy_data;
	int err;
	u32 id;

	devlink = priv_to_devlink(nsim_dev);

	err = nsim_dev_take_snapshot(devlink, NULL, &dummy_data);
	if (err)
		return err;

	err = devlink_region_snapshot_id_get(devlink, &id);
	if (err) {
		pr_err("Failed to get snapshot id\n");
		kfree(dummy_data);
		return err;
	}
	err = devlink_region_snapshot_create(nsim_dev->dummy_region,
					     dummy_data, id);
	devlink_region_snapshot_id_put(devlink, id);
	if (err) {
		pr_err("Failed to create region snapshot\n");
		kfree(dummy_data);
		return err;
	}

	return count;
}

static const struct file_operations nsim_dev_take_snapshot_fops = {
	.open = simple_open,
	.write = nsim_dev_take_snapshot_write,
	.llseek = generic_file_llseek,
};

static ssize_t nsim_dev_trap_fa_cookie_read(struct file *file,
					    char __user *data,
					    size_t count, loff_t *ppos)
{
	struct nsim_dev *nsim_dev = file->private_data;
	struct flow_action_cookie *fa_cookie;
	unsigned int buf_len;
	ssize_t ret;
	char *buf;

	spin_lock(&nsim_dev->fa_cookie_lock);
	fa_cookie = nsim_dev->fa_cookie;
	if (!fa_cookie) {
		ret = -EINVAL;
		goto errout;
	}
	buf_len = fa_cookie->cookie_len * 2;
	buf = kmalloc(buf_len, GFP_ATOMIC);
	if (!buf) {
		ret = -ENOMEM;
		goto errout;
	}
	bin2hex(buf, fa_cookie->cookie, fa_cookie->cookie_len);
	spin_unlock(&nsim_dev->fa_cookie_lock);

	ret = simple_read_from_buffer(data, count, ppos, buf, buf_len);

	kfree(buf);
	return ret;

errout:
	spin_unlock(&nsim_dev->fa_cookie_lock);
	return ret;
}

static ssize_t nsim_dev_trap_fa_cookie_write(struct file *file,
					     const char __user *data,
					     size_t count, loff_t *ppos)
{
	struct nsim_dev *nsim_dev = fil