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
  18 /* privid for wpan_phys to determine whether they belong to us or not */
  19 const void *const mac802154_wpan_phy_privid = &mac802154_wpan_phy_privid;
  20
  21 void ieee802154_wake_queue(struct ieee802154_hw *hw)
  22 {
  23         struct ieee802154_local *local = hw_to_local(hw);
  24         struct ieee802154_sub_if_data *sdata;
  25
  26         rcu_read_lock();
  27         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
  28                 if (!sdata->dev)
  29                         continue;
  30
  31                 netif_wake_queue(sdata->dev);
  32         }
  33         rcu_read_unlock();
  34 }
  35 EXPORT_SYMBOL(ieee802154_wake_queue);
  36
  37 void ieee802154_stop_queue(struct ieee802154_hw *hw)
  38 {
  39         struct ieee802154_local *local = hw_to_local(hw);
  40         struct ieee802154_sub_if_data *sdata;
  41
  42         rcu_read_lock();
  43         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
  44                 if (!sdata->dev)
  45                         continue;
  46
  47                 netif_stop_queue(sdata->dev);
  48         }
  49         rcu_read_unlock();
  50 }
  51 EXPORT_SYMBOL(ieee802154_stop_queue);
  52
  53 enum hrtimer_restart ieee802154_xmit_ifs_timer(struct hrtimer *timer)
  54 {
  55         struct ieee802154_local *local =
  56                 container_of(timer, struct ieee802154_local, ifs_timer);
  57
  58         ieee802154_wake_queue(&local->hw);
  59
  60         return HRTIMER_NORESTART;
  61 }
  62
  63 void ieee802154_xmit_complete(struct ieee802154_hw *hw, struct sk_buff *skb,
  64                               bool ifs_handling)
  65 {
  66         if (ifs_handling) {
  67                 struct ieee802154_local *local = hw_to_local(hw);
  68                 u8 max_sifs_size;
  69
  70                 /* If transceiver sets CRC on his own we need to use lifs
  71                  * threshold len above 16 otherwise 18, because it's not
  72                  * part of skb->len.
  73                  */
  74                 if (hw->flags & IEEE802154_HW_TX_OMIT_CKSUM)
  75                         max_sifs_size = IEEE802154_MAX_SIFS_FRAME_SIZE -
  76                                         IEEE802154_FCS_LEN;
  77                 else
  78                         max_sifs_size = IEEE802154_MAX_SIFS_FRAME_SIZE;
  79
  80                 if (skb->len > max_sifs_size)
  81                         hrtimer_start(&local->ifs_timer,
  82                                       ktime_set(0, hw->phy->lifs_period * NSEC_PER_USEC),
  83                                       HRTIMER_MODE_REL);
  84                 else
  85                         hrtimer_start(&local->ifs_timer,
  86                                       ktime_set(0, hw->phy->sifs_period * NSEC_PER_USEC),
  87                                       HRTIMER_MODE_REL);
  88
  89                 consume_skb(skb);
  90         } else {
  91                 ieee802154_wake_queue(hw);
  92                 consume_skb(skb);
  93         }
  94 }
  95 EXPORT_SYMBOL(ieee802154_xmit_complete);