kernel/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                                       ktime_set(0, hw->phy->lifs_period * NSEC_PER_USEC),
  84                                       HRTIMER_MODE_REL);
  85                 else
  86                         hrtimer_start(&local->ifs_timer,
  87                                       ktime_set(0, 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 }