1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (C) 2016 Felix Fietkau <nbd@nbd.name>
4 * Copyright (C) 2004 - 2009 Ivo van Doorn <IvDoorn@gmail.com>
5 */
6
7#ifndef __MT76_UTIL_H
8#define __MT76_UTIL_H
9
10#include <linux/skbuff.h>
11#include <linux/bitops.h>
12#include <linux/bitfield.h>
13#include <net/mac80211.h>
14
15struct mt76_worker
16{
17	struct task_struct *task;
18	void (*fn)(struct mt76_worker *);
19	unsigned long state;
20};
21
22enum {
23	MT76_WORKER_SCHEDULED,
24	MT76_WORKER_RUNNING,
25};
26
27#define MT76_INCR(_var, _size) \
28	(_var = (((_var) + 1) % (_size)))
29
30int mt76_wcid_alloc(u32 *mask, int size);
31
32static inline void
33mt76_wcid_mask_set(u32 *mask, int idx)
34{
35	mask[idx / 32] |= BIT(idx % 32);
36}
37
38static inline void
39mt76_wcid_mask_clear(u32 *mask, int idx)
40{
41	mask[idx / 32] &= ~BIT(idx % 32);
42}
43
44static inline void
45mt76_skb_set_moredata(struct sk_buff *skb, bool enable)
46{
47	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
48
49	if (enable)
50		hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
51	else
52		hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_MOREDATA);
53}
54
55int __mt76_worker_fn(void *ptr);
56
57static inline int
58mt76_worker_setup(struct ieee80211_hw *hw, struct mt76_worker *w,
59		  void (*fn)(struct mt76_worker *),
60		  const char *name)
61{
62	const char *dev_name = wiphy_name(hw->wiphy);
63	int ret;
64
65	if (fn)
66		w->fn = fn;
67	w->task = kthread_run(__mt76_worker_fn, w,
68			      "mt76-%s %s", name, dev_name);
69
70	if (IS_ERR(w->task)) {
71		ret = PTR_ERR(w->task);
72		w->task = NULL;
73		return ret;
74	}
75
76	return 0;
77}
78
79static inline void mt76_worker_schedule(struct mt76_worker *w)
80{
81	if (!w->task)
82		return;
83
84	if (!test_and_set_bit(MT76_WORKER_SCHEDULED, &w->state) &&
85	    !test_bit(MT76_WORKER_RUNNING, &w->state))
86		wake_up_process(w->task);
87}
88
89static inline void mt76_worker_disable(struct mt76_worker *w)
90{
91	if (!w->task)
92		return;
93
94	kthread_park(w->task);
95	WRITE_ONCE(w->state, 0);
96}
97
98static inline void mt76_worker_enable(struct mt76_worker *w)
99{
100	if (!w->task)
101		return;
102
103	kthread_unpark(w->task);
104	mt76_worker_schedule(w);
105}
106
107static inline void mt76_worker_teardown(struct mt76_worker *w)
108{
109	if (!w->task)
110		return;
111
112	kthread_stop(w->task);
113	w->task = NULL;
114}
115
116#endif
117