GNU Linux-libre 4.19.211-gnu1
[releases.git] / net / mac802154 / util.c
1 /* This program is free software; you can redistribute it and/or modify
2  * it under the terms of the GNU General Public License version 2
3  * as published by the Free Software Foundation.
4  *
5  * This program is distributed in the hope that it will be useful,
6  * but WITHOUT ANY WARRANTY; without even the implied warranty of
7  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
8  * GNU General Public License for more details.
9  *
10  * Authors:
11  * Alexander Aring <aar@pengutronix.de>
12  *
13  * Based on: net/mac80211/util.c
14  */
15
16 #include "ieee802154_i.h"
17 #include "driver-ops.h"
18
19 /* privid for wpan_phys to determine whether they belong to us or not */
20 const void *const mac802154_wpan_phy_privid = &mac802154_wpan_phy_privid;
21
22 void ieee802154_wake_queue(struct ieee802154_hw *hw)
23 {
24         struct ieee802154_local *local = hw_to_local(hw);
25         struct ieee802154_sub_if_data *sdata;
26
27         rcu_read_lock();
28         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
29                 if (!sdata->dev)
30                         continue;
31
32                 netif_wake_queue(sdata->dev);
33         }
34         rcu_read_unlock();
35 }
36 EXPORT_SYMBOL(ieee802154_wake_queue);
37
38 void ieee802154_stop_queue(struct ieee802154_hw *hw)
39 {
40         struct ieee802154_local *local = hw_to_local(hw);
41         struct ieee802154_sub_if_data *sdata;
42
43         rcu_read_lock();
44         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
45                 if (!sdata->dev)
46                         continue;
47
48                 netif_stop_queue(sdata->dev);
49         }
50         rcu_read_unlock();
51 }
52 EXPORT_SYMBOL(ieee802154_stop_queue);
53
54 enum hrtimer_restart ieee802154_xmit_ifs_timer(struct hrtimer *timer)
55 {
56         struct ieee802154_local *local =
57                 container_of(timer, struct ieee802154_local, ifs_timer);
58
59         ieee802154_wake_queue(&local->hw);
60
61         return HRTIMER_NORESTART;
62 }
63
64 void ieee802154_xmit_complete(struct ieee802154_hw *hw, struct sk_buff *skb,
65                               bool ifs_handling)
66 {
67         if (ifs_handling) {
68                 struct ieee802154_local *local = hw_to_local(hw);
69                 u8 max_sifs_size;
70
71                 /* If transceiver sets CRC on his own we need to use lifs
72                  * threshold len above 16 otherwise 18, because it's not
73                  * part of skb->len.
74                  */
75                 if (hw->flags & IEEE802154_HW_TX_OMIT_CKSUM)
76                         max_sifs_size = IEEE802154_MAX_SIFS_FRAME_SIZE -
77                                         IEEE802154_FCS_LEN;
78                 else
79                         max_sifs_size = IEEE802154_MAX_SIFS_FRAME_SIZE;
80
81                 if (skb->len > max_sifs_size)
82                         hrtimer_start(&local->ifs_timer,
83                                       hw->phy->lifs_period * NSEC_PER_USEC,
84                                       HRTIMER_MODE_REL);
85                 else
86                         hrtimer_start(&local->ifs_timer,
87                                       hw->phy->sifs_period * NSEC_PER_USEC,
88                                       HRTIMER_MODE_REL);
89         } else {
90                 ieee802154_wake_queue(hw);
91         }
92
93         dev_consume_skb_any(skb);
94 }
95 EXPORT_SYMBOL(ieee802154_xmit_complete);
96
97 void ieee802154_stop_device(struct ieee802154_local *local)
98 {
99         flush_workqueue(local->workqueue);
100         hrtimer_cancel(&local->ifs_timer);
101         drv_stop(local);
102 }