1// SPDX-License-Identifier: GPL-2.0
 2/* Copyright (c) 2019 Mellanox Technologies. All rights reserved */
 3
 4#include <linux/debugfs.h>
 5#include <linux/err.h>
 6#include <linux/kernel.h>
 7#include <linux/slab.h>
 8
 9#include "netdevsim.h"
10
11static struct dentry *nsim_sdev_ddir;
12
13static u32 nsim_sdev_id;
14
15struct netdevsim_shared_dev *nsim_sdev_get(struct netdevsim *joinns)
16{
17	struct netdevsim_shared_dev *sdev;
18	char sdev_ddir_name[10];
19	int err;
20
21	if (joinns) {
22		if (WARN_ON(!joinns->sdev))
23			return ERR_PTR(-EINVAL);
24		sdev = joinns->sdev;
25		sdev->refcnt++;
26		return sdev;
27	}
28
29	sdev = kzalloc(sizeof(*sdev), GFP_KERNEL);
30	if (!sdev)
31		return ERR_PTR(-ENOMEM);
32	sdev->refcnt = 1;
33	sdev->switch_id = nsim_sdev_id++;
34
35	sprintf(sdev_ddir_name, "%u", sdev->switch_id);
36	sdev->ddir = debugfs_create_dir(sdev_ddir_name, nsim_sdev_ddir);
37	if (IS_ERR_OR_NULL(sdev->ddir)) {
38		err = PTR_ERR_OR_ZERO(sdev->ddir) ?: -EINVAL;
39		goto err_sdev_free;
40	}
41
42	return sdev;
43
44err_sdev_free:
45	nsim_sdev_id--;
46	kfree(sdev);
47	return ERR_PTR(err);
48}
49
50void nsim_sdev_put(struct netdevsim_shared_dev *sdev)
51{
52	if (--sdev->refcnt)
53		return;
54	debugfs_remove_recursive(sdev->ddir);
55	kfree(sdev);
56}
57
58int nsim_sdev_init(void)
59{
60	nsim_sdev_ddir = debugfs_create_dir(DRV_NAME "_sdev", NULL);
61	if (IS_ERR_OR_NULL(nsim_sdev_ddir))
62		return -ENOMEM;
63	return 0;
64}
65
66void nsim_sdev_exit(void)
67{
68	debugfs_remove_recursive(nsim_sdev_ddir);
69}