// SPDX-License-Identifier: GPL-2.0-only
  /*

   *
   * Authors:
   * Alexander Aring <aar@pengutronix.de>
   *
   * Based on: net/mac80211/util.c
   */
  
  #include "ieee802154_i.h"

  #include "driver-ops.h"

  /* privid for wpan_phys to determine whether they belong to us or not */
  const void *const mac802154_wpan_phy_privid = &mac802154_wpan_phy_privid;

  void ieee802154_wake_queue(struct ieee802154_hw *hw)
  {
  	struct ieee802154_local *local = hw_to_local(hw);
  	struct ieee802154_sub_if_data *sdata;
  
  	rcu_read_lock();
  	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
  		if (!sdata->dev)
  			continue;
  
  		netif_wake_queue(sdata->dev);
  	}
  	rcu_read_unlock();
  }
  EXPORT_SYMBOL(ieee802154_wake_queue);
  
  void ieee802154_stop_queue(struct ieee802154_hw *hw)
  {
  	struct ieee802154_local *local = hw_to_local(hw);
  	struct ieee802154_sub_if_data *sdata;
  
  	rcu_read_lock();
  	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
  		if (!sdata->dev)
  			continue;
  
  		netif_stop_queue(sdata->dev);
  	}
  	rcu_read_unlock();
  }
  EXPORT_SYMBOL(ieee802154_stop_queue);

  enum hrtimer_restart ieee802154_xmit_ifs_timer(struct hrtimer *timer)

  {

  	struct ieee802154_local *local =
  		container_of(timer, struct ieee802154_local, ifs_timer);
  
  	ieee802154_wake_queue(&local->hw);
  
  	return HRTIMER_NORESTART;
  }
  
  void ieee802154_xmit_complete(struct ieee802154_hw *hw, struct sk_buff *skb,
  			      bool ifs_handling)
  {
  	if (ifs_handling) {
  		struct ieee802154_local *local = hw_to_local(hw);

  		u8 max_sifs_size;

  		/* If transceiver sets CRC on his own we need to use lifs
  		 * threshold len above 16 otherwise 18, because it's not
  		 * part of skb->len.
  		 */
  		if (hw->flags & IEEE802154_HW_TX_OMIT_CKSUM)
  			max_sifs_size = IEEE802154_MAX_SIFS_FRAME_SIZE -
  					IEEE802154_FCS_LEN;
  		else
  			max_sifs_size = IEEE802154_MAX_SIFS_FRAME_SIZE;
  
  		if (skb->len > max_sifs_size)

  			hrtimer_start(&local->ifs_timer,

  				      hw->phy->lifs_period * NSEC_PER_USEC,

  				      HRTIMER_MODE_REL);
  		else
  			hrtimer_start(&local->ifs_timer,

  				      hw->phy->sifs_period * NSEC_PER_USEC,

  				      HRTIMER_MODE_REL);

  	} else {
  		ieee802154_wake_queue(hw);

  	}

  
  	dev_consume_skb_any(skb);

  }
  EXPORT_SYMBOL(ieee802154_xmit_complete);

  
  void ieee802154_stop_device(struct ieee802154_local *local)
  {
  	flush_workqueue(local->workqueue);
  	hrtimer_cancel(&local->ifs_timer);
  	drv_stop(local);
  }