From 9cc63f8bcd560c760d0b12e15bba8f81c86237cf Mon Sep 17 00:00:00 2001 From: "Paul E. McKenney" Date: Fri, 14 Aug 2026 15:43:51 -0700 Subject: Merge branches 'expcb.2026.07.24a', 'misc.2026.07.30a', 'rcu-tasks.2026.07.30a', 'srcu.2026.08.11a' and 'torture.2026.08.14a' into HEAD Changes: Make expedited grace periods expedite normal RCU callbacks Miscellaneous fixes: * Improve diagnostic output with character task states. * Mark accesses to inform KCSAN of concurrency design. * Move from kmalloc() to kmalloc_obj(). * Documentation updates. * Improve handling of RCU deferred quiescent states. * Clean up unused function arguments and structure fields. * Reduce show_rcu_gp_kthreads() stack space. Tasks RCU updates: * Clean up after SRCU re-implementation of Tasks Trace RCU. * Mark accesses to inform KCSAN of concurrency design. * Add ->lazy_timer status to diagnostic output. * Remove an unnecessary memory barrier. * Fix a data race, courtesy of KCSAN. * Documentation updates. * Convert cond_resched_tasks_rcu_qs() from macro to static inline function. SRCU updates: * Add Rust helpers for SRCU. * Avoid losing queued work at cleanup_srcu_struct() time. Torture-test updates: * Preparation work for immediate RCU priority deboosting. * Test RCU readers from real interrupt handlers (as opposed to softirq). * Simplify code through use of cpumask_next_wrap(). * Improve diagnostic output with character task states. * Add rcutorture.nwriters parameter to allow lightweight stall testing, and rcutorture.stall_only to make doing so easier. * Test an RCU Tasks Trace grace period implying an RCU grace period. * Make RCU Tasks Trace torturing track reader batches. * Fix a data race, courtesy of KCSAN. * Plug a shuffle_tmp_mask memory leak on kthread spawn failure. --- net/mac802154/util.c | 173 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 173 insertions(+) create mode 100644 net/mac802154/util.c (limited to 'net/mac802154/util.c') diff --git a/net/mac802154/util.c b/net/mac802154/util.c new file mode 100644 index 000000000..ebc9a8521 --- /dev/null +++ b/net/mac802154/util.c @@ -0,0 +1,173 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * + * Authors: + * Alexander Aring + * + * 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); +} -- cgit v1.3.1