// 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; /** * ieee802154_wake_queue - wake ieee802154 queue * @hw: main hardware object * * Tranceivers usually have either one transmit framebuffer or one framebuffer * for both transmitting and receiving. Hence, the core currently only handles * one frame at a time for each phy, which means we had to stop the queue to * avoid new skb to come during the transmission. The queue then needs to be * woken up after the operation. */static 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();	clear_bit(WPAN_PHY_FLAG_STATE_QUEUE_STOPPED, &local->phy->flags);	list_for_each_entry_rcu(sdata, &local->interfaces, list) {		if (!sdata->dev)			continue; 		netif_wake_queue(sdata->dev);	}	rcu_read_unlock();} /** * ieee802154_stop_queue - stop ieee802154 queue * @hw: main hardware object * * Tranceivers usually have either one transmit framebuffer or one framebuffer * for both transmitting and receiving. Hence, the core currently only handles * one frame at a time for each phy, which means we need to tell upper layers to * stop giving us new skbs while we are busy with the transmitted one. The queue * must then be stopped before transmitting. */static 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();} void ieee802154_hold_queue(struct ieee802154_local *local){	unsigned long flags; 	spin_lock_irqsave(&local->phy->queue_lock, flags);	if (!atomic_fetch_inc(&local->phy->hold_txs))		ieee802154_stop_queue(&local->hw);	spin_unlock_irqrestore(&local->phy->queue_lock, flags);} void ieee802154_release_queue(struct ieee802154_local *local){	unsigned long flags; 	spin_lock_irqsave(&local->phy->queue_lock, flags);	if (atomic_dec_and_test(&local->phy->hold_txs))		ieee802154_wake_queue(&local->hw);	spin_unlock_irqrestore(&local->phy->queue_lock, flags);} void ieee802154_disable_queue(struct ieee802154_local *local){	struct ieee802154_sub_if_data *sdata; 	rcu_read_lock();	list_for_each_entry_rcu(sdata, &local->interfaces, list) {		if (!sdata->dev)			continue; 		netif_tx_disable(sdata->dev);	}	rcu_read_unlock();} enum hrtimer_restart ieee802154_xmit_ifs_timer(struct hrtimer *timer){	struct ieee802154_local *local =		container_of(timer, struct ieee802154_local, ifs_timer); 	ieee802154_release_queue(local); 	return HRTIMER_NORESTART;} void ieee802154_xmit_complete(struct ieee802154_hw *hw, struct sk_buff *skb,			      bool ifs_handling){	struct ieee802154_local *local = hw_to_local(hw); 	local->tx_result = IEEE802154_SUCCESS; 	if (ifs_handling) {		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_release_queue(local);	} 	dev_consume_skb_any(skb);	if (atomic_dec_and_test(&hw->phy->ongoing_txs))		wake_up(&hw->phy->sync_txq);}EXPORT_SYMBOL(ieee802154_xmit_complete); void ieee802154_xmit_error(struct ieee802154_hw *hw, struct sk_buff *skb,			   int reason){	struct ieee802154_local *local = hw_to_local(hw); 	local->tx_result = reason;	ieee802154_release_queue(local);	dev_kfree_skb_any(skb);	if (atomic_dec_and_test(&hw->phy->ongoing_txs))		wake_up(&hw->phy->sync_txq);}EXPORT_SYMBOL(ieee802154_xmit_error); void ieee802154_xmit_hw_error(struct ieee802154_hw *hw, struct sk_buff *skb){	ieee802154_xmit_error(hw, skb, IEEE802154_SYSTEM_ERROR);}EXPORT_SYMBOL(ieee802154_xmit_hw_error); void ieee802154_stop_device(struct ieee802154_local *local){	flush_workqueue(local->workqueue);	hrtimer_cancel(&local->ifs_timer);	drv_stop(local);}