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 <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 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;
	void *dummy_data;
	int err;
	u32 id;

	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);

	id = devlink_region_snapshot_id_get(priv_to_devlink(nsim_dev));
	err = devlink_region_snapshot_create(nsim_dev->dummy_region,
					     dummy_data, id, kfree);
	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 int nsim_dev_debugfs_init(struct nsim_dev *nsim_dev)
{
	char dev_ddir_name[sizeof(DRV_NAME) + 10];

	sprintf(dev_ddir_name, DRV_NAME "%u", nsim_dev->nsim_bus_dev->dev.id);
	nsim_dev->ddir = debugfs_create_dir(dev_ddir_name, nsim_dev_ddir);
	if (IS_ERR(nsim_dev->ddir))
		return PTR_ERR(nsim_dev->ddir);
	nsim_dev->ports_ddir = debugfs_create_dir("ports", nsim_dev->ddir);
	if (IS_ERR(nsim_dev->ports_ddir))
		return PTR_ERR(nsim_dev->ports_ddir);
	debugfs_create_bool("fw_update_status", 0600, nsim_dev->ddir,
			    &nsim_dev->fw_update_status);
	debugfs_create_u32("max_macs", 0600, nsim_dev->ddir,
			   &nsim_dev->max_macs);
	debugfs_create_bool("test1", 0600, nsim_dev->ddir,
			    &nsim_dev->test1);
	nsim_dev->take_snapshot = debugfs_create_file("take_snapshot",
						      0200,
						      nsim_dev->ddir,
						      nsim_dev,
						&nsim_dev_take_snapshot_fops);
	debugfs_create_bool("dont_allow_reload", 0600, nsim_dev->ddir,
			    &nsim_dev->dont_allow_reload);
	debugfs_create_bool("fail_reload", 0600, nsim_dev->ddir,
			    &nsim_dev->fail_reload);
	return 0;
}

static void nsim_dev_debugfs_exit(struct nsim_dev *nsim_dev)
{
	debugfs_remove_recursive(nsim_dev->ports_ddir);
	debugfs_remove_recursive(nsim_dev->ddir);
}

static int nsim_dev_port_debugfs_init(struct nsim_dev *nsim_dev,
				      struct nsim_dev_port *nsim_dev_port)
{
	char port_ddir_name[16];
	char dev_link_name[32];

	sprintf(port_ddir_name, "%u", nsim_dev_port->port_index);
	nsim_dev_port->ddir = debugfs_create_dir(port_ddir_name,
						 nsim_dev->ports_ddir);
	if (IS_ERR(nsim_dev_port->ddir))
		return PTR_ERR(nsim_dev_port->ddir);

	sprintf(dev_link_name, "../../../" DRV_NAME "%u",
		nsim_dev->nsim_bus_dev->dev.id);
	debugfs_create_symlink("dev", nsim_dev_port->ddir, dev_link_name);

	return 0;
}

static void nsim_dev_port_debugfs_exit(struct nsim_dev_port *nsim_dev_port)
{
	debugfs_remove_recursive(nsim_dev_port->ddir);
}

static int nsim_dev_resources_register(struct devlink *devlink)
{
	struct devlink_resource_size_params params = {
		.size_max = (u64)-1,
		.size_granularity = 1,
		.unit = DEVLINK_RESOURCE_UNIT_ENTRY
	};
	int err;

	/* Resources for IPv4 */
	err = devlink_resource_register(devlink, "IPv4", (u64)-1,
					NSIM_RESOURCE_IPV4,
					DEVLINK_RESOURCE_ID_PARENT_TOP,
					&params);
	if (err) {
		pr_err("Failed to register IPv4 top resource\n");
		goto out;
	}

	err = devlink_resource_register(devlink, "fib", (u64)-1,
					NSIM_RESOURCE_IPV4_FIB,
					N