diff options
Diffstat (limited to 'package/kernel/mac80211/patches/subsys/320-mac80211-Add-TXQ-scheduling-API.patch')
| -rw-r--r-- | package/kernel/mac80211/patches/subsys/320-mac80211-Add-TXQ-scheduling-API.patch | 292 |
1 files changed, 0 insertions, 292 deletions
diff --git a/package/kernel/mac80211/patches/subsys/320-mac80211-Add-TXQ-scheduling-API.patch b/package/kernel/mac80211/patches/subsys/320-mac80211-Add-TXQ-scheduling-API.patch deleted file mode 100644 index 0f7d9e1506..0000000000 --- a/package/kernel/mac80211/patches/subsys/320-mac80211-Add-TXQ-scheduling-API.patch +++ /dev/null @@ -1,292 +0,0 @@ -From: =?UTF-8?q?Toke=20H=C3=B8iland-J=C3=B8rgensen?= <toke@toke.dk> -Date: Tue, 18 Dec 2018 17:02:06 -0800 -Subject: [PATCH] mac80211: Add TXQ scheduling API -MIME-Version: 1.0 -Content-Type: text/plain; charset=UTF-8 -Content-Transfer-Encoding: 8bit - -This adds an API to mac80211 to handle scheduling of TXQs. The interface -between driver and mac80211 for TXQ handling is changed by adding two new -functions: ieee80211_next_txq(), which will return the next TXQ to schedule -in the current round-robin rotation, and ieee80211_return_txq(), which the -driver uses to indicate that it has finished scheduling a TXQ (which will -then be put back in the scheduling rotation if it isn't empty). - -The driver must call ieee80211_txq_schedule_start() at the start of each -scheduling session, and ieee80211_txq_schedule_end() at the end. The API -then guarantees that the same TXQ is not returned twice in the same -session (so a driver can loop on ieee80211_next_txq() without worrying -about breaking the loop. - -Usage of the new API is optional, so drivers can be ported one at a time. -In this patch, the actual scheduling performed by mac80211 is simple -round-robin, but a subsequent commit adds airtime fairness awareness to the -scheduler. - -Signed-off-by: Toke Høiland-Jørgensen <toke@toke.dk> -[minor kernel-doc fix, propagate sparse locking checks out] -Signed-off-by: Johannes Berg <johannes.berg@intel.com> ---- - ---- a/include/net/mac80211.h -+++ b/include/net/mac80211.h -@@ -107,9 +107,15 @@ - * The driver is expected to initialize its private per-queue data for stations - * and interfaces in the .add_interface and .sta_add ops. - * -- * The driver can't access the queue directly. To dequeue a frame, it calls -- * ieee80211_tx_dequeue(). Whenever mac80211 adds a new frame to a queue, it -- * calls the .wake_tx_queue driver op. -+ * The driver can't access the queue directly. To dequeue a frame from a -+ * txq, it calls ieee80211_tx_dequeue(). Whenever mac80211 adds a new frame to a -+ * queue, it calls the .wake_tx_queue driver op. -+ * -+ * Drivers can optionally delegate responsibility for scheduling queues to -+ * mac80211, to take advantage of airtime fairness accounting. In this case, to -+ * obtain the next queue to pull frames from, the driver calls -+ * ieee80211_next_txq(). The driver is then expected to return the txq using -+ * ieee80211_return_txq(). - * - * For AP powersave TIM handling, the driver only needs to indicate if it has - * buffered packets in the driver specific data structures by calling -@@ -5979,7 +5985,8 @@ void ieee80211_unreserve_tid(struct ieee - * ieee80211_tx_dequeue - dequeue a packet from a software tx queue - * - * @hw: pointer as obtained from ieee80211_alloc_hw() -- * @txq: pointer obtained from station or virtual interface -+ * @txq: pointer obtained from station or virtual interface, or from -+ * ieee80211_next_txq() - * - * Returns the skb if successful, %NULL if no frame was available. - */ -@@ -5987,6 +5994,54 @@ struct sk_buff *ieee80211_tx_dequeue(str - struct ieee80211_txq *txq); - - /** -+ * ieee80211_next_txq - get next tx queue to pull packets from -+ * -+ * @hw: pointer as obtained from ieee80211_alloc_hw() -+ * @ac: AC number to return packets from. -+ * -+ * Should only be called between calls to ieee80211_txq_schedule_start() -+ * and ieee80211_txq_schedule_end(). -+ * Returns the next txq if successful, %NULL if no queue is eligible. If a txq -+ * is returned, it should be returned with ieee80211_return_txq() after the -+ * driver has finished scheduling it. -+ */ -+struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac); -+ -+/** -+ * ieee80211_return_txq - return a TXQ previously acquired by ieee80211_next_txq() -+ * -+ * @hw: pointer as obtained from ieee80211_alloc_hw() -+ * @txq: pointer obtained from station or virtual interface -+ * -+ * Should only be called between calls to ieee80211_txq_schedule_start() -+ * and ieee80211_txq_schedule_end(). -+ */ -+void ieee80211_return_txq(struct ieee80211_hw *hw, struct ieee80211_txq *txq); -+ -+/** -+ * ieee80211_txq_schedule_start - acquire locks for safe scheduling of an AC -+ * -+ * @hw: pointer as obtained from ieee80211_alloc_hw() -+ * @ac: AC number to acquire locks for -+ * -+ * Acquire locks needed to schedule TXQs from the given AC. Should be called -+ * before ieee80211_next_txq() or ieee80211_return_txq(). -+ */ -+void ieee80211_txq_schedule_start(struct ieee80211_hw *hw, u8 ac) -+ __acquires(txq_lock); -+ -+/** -+ * ieee80211_txq_schedule_end - release locks for safe scheduling of an AC -+ * -+ * @hw: pointer as obtained from ieee80211_alloc_hw() -+ * @ac: AC number to acquire locks for -+ * -+ * Release locks previously acquired by ieee80211_txq_schedule_end(). -+ */ -+void ieee80211_txq_schedule_end(struct ieee80211_hw *hw, u8 ac) -+ __releases(txq_lock); -+ -+/** - * ieee80211_txq_get_depth - get pending frame/byte count of given txq - * - * The values are not guaranteed to be coherent with regard to each other, i.e. ---- a/net/mac80211/agg-tx.c -+++ b/net/mac80211/agg-tx.c -@@ -229,7 +229,7 @@ ieee80211_agg_start_txq(struct sta_info - clear_bit(IEEE80211_TXQ_STOP, &txqi->flags); - local_bh_disable(); - rcu_read_lock(); -- drv_wake_tx_queue(sta->sdata->local, txqi); -+ schedule_and_wake_txq(sta->sdata->local, txqi); - rcu_read_unlock(); - local_bh_enable(); - } ---- a/net/mac80211/driver-ops.h -+++ b/net/mac80211/driver-ops.h -@@ -1176,6 +1176,15 @@ static inline void drv_wake_tx_queue(str - local->ops->wake_tx_queue(&local->hw, &txq->txq); - } - -+static inline void schedule_and_wake_txq(struct ieee80211_local *local, -+ struct txq_info *txqi) -+{ -+ spin_lock_bh(&local->active_txq_lock[txqi->txq.ac]); -+ ieee80211_return_txq(&local->hw, &txqi->txq); -+ spin_unlock_bh(&local->active_txq_lock[txqi->txq.ac]); -+ drv_wake_tx_queue(local, txqi); -+} -+ - static inline int drv_start_nan(struct ieee80211_local *local, - struct ieee80211_sub_if_data *sdata, - struct cfg80211_nan_conf *conf) ---- a/net/mac80211/ieee80211_i.h -+++ b/net/mac80211/ieee80211_i.h -@@ -829,6 +829,8 @@ enum txq_info_flags { - * a fq_flow which is already owned by a different tin - * @def_cvars: codel vars for @def_flow - * @frags: used to keep fragments created after dequeue -+ * @schedule_order: used with ieee80211_local->active_txqs -+ * @schedule_round: counter to prevent infinite loops on TXQ scheduling - */ - struct txq_info { - struct fq_tin tin; -@@ -836,6 +838,8 @@ struct txq_info { - struct codel_vars def_cvars; - struct codel_stats cstats; - struct sk_buff_head frags; -+ struct list_head schedule_order; -+ u16 schedule_round; - unsigned long flags; - - /* keep last! */ -@@ -1127,6 +1131,11 @@ struct ieee80211_local { - struct codel_vars *cvars; - struct codel_params cparams; - -+ /* protects active_txqs and txqi->schedule_order */ -+ spinlock_t active_txq_lock[IEEE80211_NUM_ACS]; -+ struct list_head active_txqs[IEEE80211_NUM_ACS]; -+ u16 schedule_round[IEEE80211_NUM_ACS]; -+ - const struct ieee80211_ops *ops; - - /* ---- a/net/mac80211/main.c -+++ b/net/mac80211/main.c -@@ -652,6 +652,11 @@ struct ieee80211_hw *ieee80211_alloc_hw_ - spin_lock_init(&local->rx_path_lock); - spin_lock_init(&local->queue_stop_reason_lock); - -+ for (i = 0; i < IEEE80211_NUM_ACS; i++) { -+ INIT_LIST_HEAD(&local->active_txqs[i]); -+ spin_lock_init(&local->active_txq_lock[i]); -+ } -+ - INIT_LIST_HEAD(&local->chanctx_list); - mutex_init(&local->chanctx_mtx); - ---- a/net/mac80211/sta_info.c -+++ b/net/mac80211/sta_info.c -@@ -1244,7 +1244,7 @@ void ieee80211_sta_ps_deliver_wakeup(str - if (!txq_has_queue(sta->sta.txq[i])) - continue; - -- drv_wake_tx_queue(local, to_txq_info(sta->sta.txq[i])); -+ schedule_and_wake_txq(local, to_txq_info(sta->sta.txq[i])); - } - } - ---- a/net/mac80211/tx.c -+++ b/net/mac80211/tx.c -@@ -1441,6 +1441,7 @@ void ieee80211_txq_init(struct ieee80211 - codel_vars_init(&txqi->def_cvars); - codel_stats_init(&txqi->cstats); - __skb_queue_head_init(&txqi->frags); -+ INIT_LIST_HEAD(&txqi->schedule_order); - - txqi->txq.vif = &sdata->vif; - -@@ -1464,6 +1465,9 @@ void ieee80211_txq_purge(struct ieee8021 - - fq_tin_reset(fq, tin, fq_skb_free_func); - ieee80211_purge_tx_queue(&local->hw, &txqi->frags); -+ spin_lock_bh(&local->active_txq_lock[txqi->txq.ac]); -+ list_del_init(&txqi->schedule_order); -+ spin_unlock_bh(&local->active_txq_lock[txqi->txq.ac]); - } - - void ieee80211_txq_set_params(struct ieee80211_local *local) -@@ -1580,7 +1584,7 @@ static bool ieee80211_queue_skb(struct i - ieee80211_txq_enqueue(local, txqi, skb); - spin_unlock_bh(&fq->lock); - -- drv_wake_tx_queue(local, txqi); -+ schedule_and_wake_txq(local, txqi); - - return true; - } -@@ -3602,6 +3606,60 @@ out: - } - EXPORT_SYMBOL(ieee80211_tx_dequeue); - -+struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac) -+{ -+ struct ieee80211_local *local = hw_to_local(hw); -+ struct txq_info *txqi = NULL; -+ -+ lockdep_assert_held(&local->active_txq_lock[ac]); -+ -+ txqi = list_first_entry_or_null(&local->active_txqs[ac], -+ struct txq_info, -+ schedule_order); -+ -+ if (!txqi || txqi->schedule_round == local->schedule_round[ac]) -+ return NULL; -+ -+ list_del_init(&txqi->schedule_order); -+ txqi->schedule_round = local->schedule_round[ac]; -+ return &txqi->txq; -+} -+EXPORT_SYMBOL(ieee80211_next_txq); -+ -+void ieee80211_return_txq(struct ieee80211_hw *hw, -+ struct ieee80211_txq *txq) -+{ -+ struct ieee80211_local *local = hw_to_local(hw); -+ struct txq_info *txqi = to_txq_info(txq); -+ -+ lockdep_assert_held(&local->active_txq_lock[txq->ac]); -+ -+ if (list_empty(&txqi->schedule_order) && -+ (!skb_queue_empty(&txqi->frags) || txqi->tin.backlog_packets)) -+ list_add_tail(&txqi->schedule_order, -+ &local->active_txqs[txq->ac]); -+} -+EXPORT_SYMBOL(ieee80211_return_txq); -+ -+void ieee80211_txq_schedule_start(struct ieee80211_hw *hw, u8 ac) -+ __acquires(txq_lock) -+{ -+ struct ieee80211_local *local = hw_to_local(hw); -+ -+ spin_lock_bh(&local->active_txq_lock[ac]); -+ local->schedule_round[ac]++; -+} -+EXPORT_SYMBOL(ieee80211_txq_schedule_start); -+ -+void ieee80211_txq_schedule_end(struct ieee80211_hw *hw, u8 ac) -+ __releases(txq_lock) -+{ -+ struct ieee80211_local *local = hw_to_local(hw); -+ -+ spin_unlock_bh(&local->active_txq_lock[ac]); -+} -+EXPORT_SYMBOL(ieee80211_txq_schedule_end); -+ - void __ieee80211_subif_start_xmit(struct sk_buff *skb, - struct net_device *dev, - u32 info_flags) |