drivers/net/wireless/mediatek/mt76/util.h

   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
  15 struct mt76_worker
  16 {
  17         struct task_struct *task;
  18         void (*fn)(struct mt76_worker *);
  19         unsigned long state;
  20 };
  21
  22 enum {
  23         MT76_WORKER_SCHEDULED,
  24         MT76_WORKER_RUNNING,
  25 };
  26
  27 #define MT76_INCR(_var, _size) \
  28         (_var = (((_var) + 1) % (_size)))
  29
  30 int mt76_wcid_alloc(u32 *mask, int size);
  31
  32 static inline void
  33 mt76_wcid_mask_set(u32 *mask, int idx)
  34 {
  35         mask[idx / 32] |= BIT(idx % 32);
  36 }
  37
  38 static inline void
  39 mt76_wcid_mask_clear(u32 *mask, int idx)
  40 {
  41         mask[idx / 32] &= ~BIT(idx % 32);
  42 }
  43
  44 static inline void
  45 mt76_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
  55 int __mt76_worker_fn(void *ptr);
  56
  57 static inline int
  58 mt76_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
  79 static 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
  89 static 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
  98 static 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
 107 static 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