[linux-block.git] / net / mac802154 / util.c

// 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);
}
Commit	Line	Data
1802d0be TG	1	// SPDX-License-Identifier: GPL-2.0-only
1802d0be TG	2	/*
c2085103 AA	3	*
	4	* Authors:
	5	* Alexander Aring <aar@pengutronix.de>
	6	*
	7	* Based on: net/mac80211/util.c
	8	*/
	9
	10	#include "ieee802154_i.h"
c4227c8a	11	#include "driver-ops.h"
c2085103	12
6322d50d AA	13	/* privid for wpan_phys to determine whether they belong to us or not */
	14	const void *const mac802154_wpan_phy_privid = &mac802154_wpan_phy_privid;
	15
20a19d1d MR	16	/**
20a19d1d MR	17	* ieee802154_wake_queue - wake ieee802154 queue
982e2b73	18	* @hw: main hardware object
20a19d1d MR	19	*
	20	* Tranceivers usually have either one transmit framebuffer or one framebuffer
	21	* for both transmitting and receiving. Hence, the core currently only handles
	22	* one frame at a time for each phy, which means we had to stop the queue to
	23	* avoid new skb to come during the transmission. The queue then needs to be
	24	* woken up after the operation.
	25	*/
	26	static void ieee802154_wake_queue(struct ieee802154_hw *hw)
c2085103 AA	27	{
	28	struct ieee802154_local *local = hw_to_local(hw);
	29	struct ieee802154_sub_if_data *sdata;
	30
	31	rcu_read_lock();
2b13db13	32	clear_bit(WPAN_PHY_FLAG_STATE_QUEUE_STOPPED, &local->phy->flags);
c2085103 AA	33	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
	34	if (!sdata->dev)
	35	continue;
	36
	37	netif_wake_queue(sdata->dev);
	38	}
	39	rcu_read_unlock();
	40	}
c2085103	41
20a19d1d MR	42	/**
20a19d1d MR	43	* ieee802154_stop_queue - stop ieee802154 queue
982e2b73	44	* @hw: main hardware object
20a19d1d MR	45	*
	46	* Tranceivers usually have either one transmit framebuffer or one framebuffer
	47	* for both transmitting and receiving. Hence, the core currently only handles
	48	* one frame at a time for each phy, which means we need to tell upper layers to
	49	* stop giving us new skbs while we are busy with the transmitted one. The queue
	50	* must then be stopped before transmitting.
	51	*/
	52	static void ieee802154_stop_queue(struct ieee802154_hw *hw)
c2085103 AA	53	{
	54	struct ieee802154_local *local = hw_to_local(hw);
	55	struct ieee802154_sub_if_data *sdata;
	56
	57	rcu_read_lock();
	58	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
	59	if (!sdata->dev)
	60	continue;
	61
	62	netif_stop_queue(sdata->dev);
	63	}
	64	rcu_read_unlock();
	65	}
20a19d1d MR	66
	67	void ieee802154_hold_queue(struct ieee802154_local *local)
	68	{
	69	unsigned long flags;
	70
	71	spin_lock_irqsave(&local->phy->queue_lock, flags);
	72	if (!atomic_fetch_inc(&local->phy->hold_txs))
	73	ieee802154_stop_queue(&local->hw);
	74	spin_unlock_irqrestore(&local->phy->queue_lock, flags);
	75	}
	76
	77	void ieee802154_release_queue(struct ieee802154_local *local)
	78	{
	79	unsigned long flags;
	80
	81	spin_lock_irqsave(&local->phy->queue_lock, flags);
2ec2f6be	82	if (atomic_dec_and_test(&local->phy->hold_txs))
20a19d1d MR	83	ieee802154_wake_queue(&local->hw);
	84	spin_unlock_irqrestore(&local->phy->queue_lock, flags);
	85	}
c2085103	86
a40612f3 MR	87	void ieee802154_disable_queue(struct ieee802154_local *local)
	88	{
	89	struct ieee802154_sub_if_data *sdata;
	90
	91	rcu_read_lock();
	92	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
	93	if (!sdata->dev)
	94	continue;
	95
	96	netif_tx_disable(sdata->dev);
	97	}
	98	rcu_read_unlock();
	99	}
	100
61f2dcba	101	enum hrtimer_restart ieee802154_xmit_ifs_timer(struct hrtimer *timer)
c2085103	102	{
61f2dcba AA	103	struct ieee802154_local *local =
	104	container_of(timer, struct ieee802154_local, ifs_timer);
	105
20a19d1d	106	ieee802154_release_queue(local);
61f2dcba AA	107
	108	return HRTIMER_NORESTART;
	109	}
	110
	111	void ieee802154_xmit_complete(struct ieee802154_hw hw, struct sk_buff skb,
	112	bool ifs_handling)
	113	{
337e2f86 MR	114	struct ieee802154_local *local = hw_to_local(hw);
	115
	116	local->tx_result = IEEE802154_SUCCESS;
	117
61f2dcba	118	if (ifs_handling) {
3f3c4bb5	119	u8 max_sifs_size;
61f2dcba	120
3f3c4bb5 AA	121	/* If transceiver sets CRC on his own we need to use lifs
	122	* threshold len above 16 otherwise 18, because it's not
	123	* part of skb->len.
	124	*/
	125	if (hw->flags & IEEE802154_HW_TX_OMIT_CKSUM)
	126	max_sifs_size = IEEE802154_MAX_SIFS_FRAME_SIZE -
	127	IEEE802154_FCS_LEN;
	128	else
	129	max_sifs_size = IEEE802154_MAX_SIFS_FRAME_SIZE;
	130
	131	if (skb->len > max_sifs_size)
61f2dcba	132	hrtimer_start(&local->ifs_timer,
8b0e1953	133	hw->phy->lifs_period * NSEC_PER_USEC,
61f2dcba AA	134	HRTIMER_MODE_REL);
	135	else
	136	hrtimer_start(&local->ifs_timer,
8b0e1953	137	hw->phy->sifs_period * NSEC_PER_USEC,
61f2dcba	138	HRTIMER_MODE_REL);
61f2dcba	139	} else {
20a19d1d	140	ieee802154_release_queue(local);
61f2dcba	141	}
3862eba6 AA	142
3862eba6 AA	143	dev_consume_skb_any(skb);
6c1c78d0	144	if (atomic_dec_and_test(&hw->phy->ongoing_txs))
f0feb349	145	wake_up(&hw->phy->sync_txq);
c2085103 AA	146	}
c2085103 AA	147	EXPORT_SYMBOL(ieee802154_xmit_complete);
c4227c8a	148
30ca44eb MR	149	void ieee802154_xmit_error(struct ieee802154_hw hw, struct sk_buff skb,
	150	int reason)
	151	{
	152	struct ieee802154_local *local = hw_to_local(hw);
	153
	154	local->tx_result = reason;
20a19d1d	155	ieee802154_release_queue(local);
30ca44eb	156	dev_kfree_skb_any(skb);
6c1c78d0	157	if (atomic_dec_and_test(&hw->phy->ongoing_txs))
f0feb349	158	wake_up(&hw->phy->sync_txq);
30ca44eb MR	159	}
	160	EXPORT_SYMBOL(ieee802154_xmit_error);
	161
5a1b57c0 MR	162	void ieee802154_xmit_hw_error(struct ieee802154_hw hw, struct sk_buff skb)
	163	{
	164	ieee802154_xmit_error(hw, skb, IEEE802154_SYSTEM_ERROR);
	165	}
	166	EXPORT_SYMBOL(ieee802154_xmit_hw_error);
	167
c4227c8a AA	168	void ieee802154_stop_device(struct ieee802154_local *local)
	169	{
	170	flush_workqueue(local->workqueue);
	171	hrtimer_cancel(&local->ifs_timer);
	172	drv_stop(local);
	173	}