LXR linux/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 */
  20const void *const mac802154_wpan_phy_privid = &mac802154_wpan_phy_privid;
  21
  22void 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}
  36EXPORT_SYMBOL(ieee802154_wake_queue);
  37
  38void 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}
  52EXPORT_SYMBOL(ieee802154_stop_queue);
  53
  54enum 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
  64void 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}
  95EXPORT_SYMBOL(ieee802154_xmit_complete);
  96
  97void ieee802154_stop_device(struct ieee802154_local *local)
  98{
  99        flush_workqueue(local->workqueue);
 100        hrtimer_cancel(&local->ifs_timer);
 101        drv_stop(local);
 102}
 103