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// 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);
}
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