[PATCH v5 0/6] Move TXQ scheduling and airtime fairness into mac80211

[PATCH v5 0/6] Move TXQ scheduling and airtime fairness into mac80211

[Rajkumar Manoharan]

All,

Sorry for the long delay. Here is the consolidated series of mac80211,
ath9k and ath10k changes for moving TXQ scheduling and airtime fairness
into mac80211 and support airtime fairness.

Three main APIs are defined for TXQ scheduling.
  - ieee80211_next_txq
  - ieee80211_return_txq
  - ieee80211_txq_may_transmit

and two APIs for synchronization when the driver wants to iterate
through all TXQs.
  - ieee80211_txq_schedule_start
  - ieee80211_txq_schedule_end

The earlier discussions:
https://patchwork.kernel.org/project/linux-wireless/list/?series=&submitter=&state=*&q=TXQ+scheduling&archive=both&delegate=

-Rajkumar

v2:
 - replaced driver specific airtime default by multiplier
 - fixed tab intent
 - fixed author and commit log
v3:
 - fixed checkpatch warnings and kbuild bot errors.
   few of over 80 char warnings are left.
v4:
 - Folded Louie's airtime counter reset change
 - rebased the series on top of mac80211 tree.
v5:
 - fix kbuild-robot errors (s/BIT/BIT_ULL)

Kan Yan (1):
  ath10k: reporting estimated tx airtime for fairness

Toke Høiland-Jørgensen (5):
  mac80211: Add TXQ scheduling API
  cfg80211: Add airtime statistics and settings
  mac80211: Add airtime accounting and scheduling to TXQs
  ath9k: Switch to mac80211 TXQ scheduling and airtime APIs
  ath10k: migrate to mac80211 txq scheduling

 drivers/net/wireless/ath/ath10k/core.c     |   2 -
 drivers/net/wireless/ath/ath10k/core.h     |   8 +-
 drivers/net/wireless/ath/ath10k/htc.h      |   1 -
 drivers/net/wireless/ath/ath10k/htt_rx.c   |   9 ++
 drivers/net/wireless/ath/ath10k/mac.c      | 155 +++++++++++-------
 drivers/net/wireless/ath/ath10k/txrx.c     |   4 +
 drivers/net/wireless/ath/ath9k/ath9k.h     |  14 --
 drivers/net/wireless/ath/ath9k/debug.c     |   3 -
 drivers/net/wireless/ath/ath9k/debug.h     |   8 -
 drivers/net/wireless/ath/ath9k/debug_sta.c |  70 ---------
 drivers/net/wireless/ath/ath9k/init.c      |   3 +-
 drivers/net/wireless/ath/ath9k/recv.c      |   9 +-
 drivers/net/wireless/ath/ath9k/xmit.c      | 244 +++++++++--------------------
 include/net/cfg80211.h                     |  10 +-
 include/net/mac80211.h                     | 121 +++++++++++++-
 include/uapi/linux/nl80211.h               |  15 ++
 net/mac80211/agg-tx.c                      |   2 +-
 net/mac80211/cfg.c                         |   3 +
 net/mac80211/debugfs.c                     |   3 +
 net/mac80211/debugfs_sta.c                 |  68 +++++++-
 net/mac80211/driver-ops.h                  |   9 ++
 net/mac80211/ieee80211_i.h                 |  11 ++
 net/mac80211/main.c                        |   9 ++
 net/mac80211/sta_info.c                    |  46 +++++-
 net/mac80211/sta_info.h                    |  13 ++
 net/mac80211/status.c                      |   6 +
 net/mac80211/tx.c                          | 140 ++++++++++++++++-
 net/wireless/nl80211.c                     |  30 ++++
 28 files changed, 662 insertions(+), 354 deletions(-)

-- 
1.9.1

[PATCH v5 1/6] mac80211: Add TXQ scheduling API

[Rajkumar Manoharan]

From: Toke Høiland-Jørgensen <toke@toke.dk>

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>
---
 include/net/mac80211.h     | 62 +++++++++++++++++++++++++++++++++++++++++++---
 net/mac80211/agg-tx.c      |  2 +-
 net/mac80211/driver-ops.h  |  9 +++++++
 net/mac80211/ieee80211_i.h |  9 +++++++
 net/mac80211/main.c        |  5 ++++
 net/mac80211/sta_info.c    |  2 +-
 net/mac80211/tx.c          | 58 ++++++++++++++++++++++++++++++++++++++++++-
 7 files changed, 140 insertions(+), 7 deletions(-)

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 71985e95d2d9..18b11c119b7e 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -108,9 +108,15 @@
  * 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
@@ -6088,7 +6094,8 @@ void ieee80211_tdls_oper_request(struct ieee80211_vif *vif, const u8 *peer,
  * 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.
  */
@@ -6096,6 +6103,53 @@ struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
 				     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);
+
+/**
+ * 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);
+
+/**
  * 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.
diff --git a/net/mac80211/agg-tx.c b/net/mac80211/agg-tx.c
index 69e831bc317b..e94b1a0407af 100644
--- a/net/mac80211/agg-tx.c
+++ b/net/mac80211/agg-tx.c
@@ -229,7 +229,7 @@ static void __releases(agg_queue)
 	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();
 }
diff --git a/net/mac80211/driver-ops.h b/net/mac80211/driver-ops.h
index 0b1747a2313d..ce4138323820 100644
--- a/net/mac80211/driver-ops.h
+++ b/net/mac80211/driver-ops.h
@@ -1173,6 +1173,15 @@ static inline void drv_wake_tx_queue(struct ieee80211_local *local,
 	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_can_aggregate_in_amsdu(struct ieee80211_local *local,
 					     struct sk_buff *head,
 					     struct sk_buff *skb)
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 10a05062e4a0..33763a2eac81 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -830,6 +830,8 @@ 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;
@@ -837,6 +839,8 @@ 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! */
@@ -1128,6 +1132,11 @@ 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;
 
 	/*
diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index 7b8320d4a8e4..5d292ef0a544 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -663,6 +663,11 @@ struct ieee80211_hw *ieee80211_alloc_hw_nm(size_t priv_data_len,
 	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);
 
diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c
index fb8c2252ac0e..c2f5cb7df54f 100644
--- a/net/mac80211/sta_info.c
+++ b/net/mac80211/sta_info.c
@@ -1249,7 +1249,7 @@ void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta)
 		if (!sta->sta.txq[i] || !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]));
 	}
 
 	skb_queue_head_init(&pending);
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index 1f536ba573b4..ae897c4d2520 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -1449,6 +1449,7 @@ void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata,
 	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;
 
@@ -1489,6 +1490,9 @@ void ieee80211_txq_purge(struct ieee80211_local *local,
 
 	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)
@@ -1605,7 +1609,7 @@ static bool ieee80211_queue_skb(struct ieee80211_local *local,
 	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;
 }
@@ -3627,6 +3631,58 @@ struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
 }
 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)
+{
+	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)
+{
+	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)
-- 
1.9.1

[PATCH v5 2/6] cfg80211: Add airtime statistics and settings

[Rajkumar Manoharan]

From: Toke Høiland-Jørgensen <toke@toke.dk>

This adds TX airtime statistics to the cfg80211 station dump (to go along
with the RX info already present), and adds a new parameter to set the
airtime weight of each station. The latter allows userspace to implement
policies for different stations by varying their weights.

Signed-off-by: Toke Høiland-Jørgensen <toke@toke.dk>
[rmanohar@codeaurora.org: fixed checkpatch warnings]
Signed-off-by: Rajkumar Manoharan <rmanohar@codeaurora.org>
---
 include/net/cfg80211.h       | 10 +++++++++-
 include/uapi/linux/nl80211.h | 15 +++++++++++++++
 net/wireless/nl80211.c       | 30 ++++++++++++++++++++++++++++++
 3 files changed, 54 insertions(+), 1 deletion(-)

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 1fa41b7a1be3..f1312f17fbef 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -1001,6 +1001,7 @@ enum station_parameters_apply_mask {
  * @support_p2p_ps: information if station supports P2P PS mechanism
  * @he_capa: HE capabilities of station
  * @he_capa_len: the length of the HE capabilities
+ * @airtime_weight: airtime scheduler weight for this station
  */
 struct station_parameters {
 	const u8 *supported_rates;
@@ -1030,6 +1031,7 @@ struct station_parameters {
 	int support_p2p_ps;
 	const struct ieee80211_he_cap_elem *he_capa;
 	u8 he_capa_len;
+	u16 airtime_weight;
 };
 
 /**
@@ -1297,6 +1299,8 @@ struct cfg80211_tid_stats {
  * @rx_beacon_signal_avg: signal strength average (in dBm) for beacons received
  *	from this peer
  * @rx_duration: aggregate PPDU duration(usecs) for all the frames from a peer
+ * @tx_duration: aggregate PPDU duration(usecs) for all the frames to a peer
+ * @airtime_weight: current airtime scheduling weight
  * @pertid: per-TID statistics, see &struct cfg80211_tid_stats, using the last
  *	(IEEE80211_NUM_TIDS) index for MSDUs not encapsulated in QoS-MPDUs.
  *	Note that this doesn't use the @filled bit, but is used if non-NULL.
@@ -1347,10 +1351,12 @@ struct station_info {
 
 	u32 expected_throughput;
 
-	u64 rx_beacon;
+	u64 tx_duration;
 	u64 rx_duration;
+	u64 rx_beacon;
 	u8 rx_beacon_signal_avg;
 	struct cfg80211_tid_stats *pertid;
+	u16 airtime_weight;
 	s8 ack_signal;
 	s8 avg_ack_signal;
 
@@ -2381,6 +2387,8 @@ enum wiphy_params_flags {
 	WIPHY_PARAM_TXQ_QUANTUM		= 1 << 8,
 };
 
+#define IEEE80211_DEFAULT_AIRTIME_WEIGHT	256
+
 /**
  * struct cfg80211_pmksa - PMK Security Association
  *
diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index 6d610bae30a9..9428bd0ebb1a 100644
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -2254,6 +2254,9 @@ enum nl80211_commands {
  * @NL80211_ATTR_FTM_RESPONDER_STATS: Nested attribute with FTM responder
  *	statistics, see &enum nl80211_ftm_responder_stats.
  *
+ * @NL80211_ATTR_AIRTIME_WEIGHT: Station's weight when scheduled by the airtime
+ *	scheduler.
+ *
  * @NUM_NL80211_ATTR: total number of nl80211_attrs available
  * @NL80211_ATTR_MAX: highest attribute number currently defined
  * @__NL80211_ATTR_AFTER_LAST: internal use
@@ -2699,6 +2702,8 @@ enum nl80211_attrs {
 
 	NL80211_ATTR_FTM_RESPONDER_STATS,
 
+	NL80211_ATTR_AIRTIME_WEIGHT,
+
 	/* add attributes here, update the policy in nl80211.c */
 
 	__NL80211_ATTR_AFTER_LAST,
@@ -3074,6 +3079,9 @@ enum nl80211_sta_bss_param {
  *	with an FCS error (u32, from this station). This count may not include
  *	some packets with an FCS error due to TA corruption. Hence this counter
  *	might not be fully accurate.
+ * @NL80211_STA_INFO_TX_DURATION: aggregate PPDU duration for all frames
+ *	sent to the station (u64, usec)
+ * @NL80211_STA_INFO_AIRTIME_WEIGHT: current airtime weight for station (u16)
  * @__NL80211_STA_INFO_AFTER_LAST: internal
  * @NL80211_STA_INFO_MAX: highest possible station info attribute
  */
@@ -3116,6 +3124,8 @@ enum nl80211_sta_info {
 	NL80211_STA_INFO_ACK_SIGNAL_AVG,
 	NL80211_STA_INFO_RX_MPDUS,
 	NL80211_STA_INFO_FCS_ERROR_COUNT,
+	NL80211_STA_INFO_TX_DURATION,
+	NL80211_STA_INFO_AIRTIME_WEIGHT,
 
 	/* keep last */
 	__NL80211_STA_INFO_AFTER_LAST,
@@ -5258,6 +5268,10 @@ enum nl80211_feature_flags {
  *      if this flag is not set. Ignoring this can leak clear text packets and/or
  *      freeze the connection.
  *
+ * @NL80211_EXT_FEATURE_AIRTIME_FAIRNESS: Driver supports getting airtime
+ *	fairness for transmitted packets and has enabled airtime fairness
+ *	scheduling.
+ *
  * @NUM_NL80211_EXT_FEATURES: number of extended features.
  * @MAX_NL80211_EXT_FEATURES: highest extended feature index.
  */
@@ -5297,6 +5311,7 @@ enum nl80211_ext_feature_index {
 	NL80211_EXT_FEATURE_SCAN_MIN_PREQ_CONTENT,
 	NL80211_EXT_FEATURE_CAN_REPLACE_PTK0,
 	NL80211_EXT_FEATURE_ENABLE_FTM_RESPONDER,
+	NL80211_EXT_FEATURE_AIRTIME_FAIRNESS,
 
 	/* add new features before the definition below */
 	NUM_NL80211_EXT_FEATURES,
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 2317727d6413..aa53a8563295 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -497,6 +497,7 @@ static int validate_ie_attr(const struct nlattr *attr,
 		.type = NLA_NESTED,
 		.validation_data = nl80211_ftm_responder_policy,
 	},
+	[NL80211_ATTR_AIRTIME_WEIGHT] = { .type = NLA_U16 },
 };
 
 /* policy for the key attributes */
@@ -4690,6 +4691,11 @@ static int nl80211_send_station(struct sk_buff *msg, u32 cmd, u32 portid,
 	PUT_SINFO(PLID, plid, u16);
 	PUT_SINFO(PLINK_STATE, plink_state, u8);
 	PUT_SINFO_U64(RX_DURATION, rx_duration);
+	PUT_SINFO_U64(TX_DURATION, tx_duration);
+
+	if (wiphy_ext_feature_isset(&rdev->wiphy,
+				    NL80211_EXT_FEATURE_AIRTIME_FAIRNESS))
+		PUT_SINFO(AIRTIME_WEIGHT, airtime_weight, u16);
 
 	switch (rdev->wiphy.signal_type) {
 	case CFG80211_SIGNAL_TYPE_MBM:
@@ -5308,6 +5314,18 @@ static int nl80211_set_station(struct sk_buff *skb, struct genl_info *info)
 			nla_get_u8(info->attrs[NL80211_ATTR_OPMODE_NOTIF]);
 	}
 
+	if (info->attrs[NL80211_ATTR_AIRTIME_WEIGHT]) {
+		params.airtime_weight =
+			nla_get_u16(info->attrs[NL80211_ATTR_AIRTIME_WEIGHT]);
+		if (!params.airtime_weight)
+			return -EINVAL;
+	}
+
+	if (params.airtime_weight &&
+	    !wiphy_ext_feature_isset(&rdev->wiphy,
+				     NL80211_EXT_FEATURE_AIRTIME_FAIRNESS))
+		return -EOPNOTSUPP;
+
 	/* Include parameters for TDLS peer (will check later) */
 	err = nl80211_set_station_tdls(info, &params);
 	if (err)
@@ -5436,6 +5454,18 @@ static int nl80211_new_station(struct sk_buff *skb, struct genl_info *info)
 		params.plink_action =
 			nla_get_u8(info->attrs[NL80211_ATTR_STA_PLINK_ACTION]);
 
+	if (info->attrs[NL80211_ATTR_AIRTIME_WEIGHT]) {
+		params.airtime_weight =
+			nla_get_u16(info->attrs[NL80211_ATTR_AIRTIME_WEIGHT]);
+		if (!params.airtime_weight)
+			return -EINVAL;
+	}
+
+	if (params.airtime_weight &&
+	    !wiphy_ext_feature_isset(&rdev->wiphy,
+				     NL80211_EXT_FEATURE_AIRTIME_FAIRNESS))
+		return -EOPNOTSUPP;
+
 	err = nl80211_parse_sta_channel_info(info, &params);
 	if (err)
 		return err;
-- 
1.9.1

[PATCH v5 3/6] mac80211: Add airtime accounting and scheduling to TXQs

[Rajkumar Manoharan]

From: Toke Høiland-Jørgensen <toke@toke.dk>

This adds airtime accounting and scheduling to the mac80211 TXQ
scheduler. A new callback, ieee80211_sta_register_airtime(), is added
that drivers can call to report airtime usage for stations.

When airtime information is present, mac80211 will schedule TXQs
(through ieee80211_next_txq()) in a way that enforces airtime fairness
between active stations. This scheduling works the same way as the ath9k
in-driver airtime fairness scheduling. If no airtime usage is reported
by the driver, the scheduler will default to round-robin scheduling.

For drivers that don't control TXQ scheduling in software, a new API
function, ieee80211_txq_may_transmit(), is added which the driver can use
to check if the TXQ is eligible for transmission, or should be throttled to
enforce fairness. Calls to this function must also be enclosed in
ieee80211_txq_schedule_{start,end}() calls to ensure proper locking.

The API ieee80211_txq_may_transmit() also ensures that TXQ list will be
aligned aginst driver's own round-robin scheduler list. i.e it rotates
the TXQ list till it makes the requested node becomes the first entry
in TXQ list. Thus both the TXQ list and driver's list are in sync.

Co-developed-by: Rajkumar Manoharan <rmanohar@codeaurora.org>
Signed-off-by: Louie Lu <git@louie.lu>
[added debugfs write op to reset airtime counter]
Signed-off-by: Toke Høiland-Jørgensen <toke@toke.dk>
Signed-off-by: Rajkumar Manoharan <rmanohar@codeaurora.org>
---
 include/net/mac80211.h     | 59 ++++++++++++++++++++++++++++++
 net/mac80211/cfg.c         |  3 ++
 net/mac80211/debugfs.c     |  3 ++
 net/mac80211/debugfs_sta.c | 68 +++++++++++++++++++++++++++++++++--
 net/mac80211/ieee80211_i.h |  2 ++
 net/mac80211/main.c        |  4 +++
 net/mac80211/sta_info.c    | 44 +++++++++++++++++++++--
 net/mac80211/sta_info.h    | 13 +++++++
 net/mac80211/status.c      |  6 ++++
 net/mac80211/tx.c          | 90 +++++++++++++++++++++++++++++++++++++++++++---
 10 files changed, 282 insertions(+), 10 deletions(-)

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 18b11c119b7e..c43d615ee9b1 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -2357,6 +2357,9 @@ enum ieee80211_hw_flags {
  * @tx_sk_pacing_shift: Pacing shift to set on TCP sockets when frames from
  *	them are encountered. The default should typically not be changed,
  *	unless the driver has good reasons for needing more buffers.
+ *
+ * @weight_multipler: Driver specific airtime weight multiplier used while
+ *	refilling deficit of each TXQ.
  */
 struct ieee80211_hw {
 	struct ieee80211_conf conf;
@@ -2393,6 +2396,7 @@ struct ieee80211_hw {
 	const struct ieee80211_cipher_scheme *cipher_schemes;
 	u8 max_nan_de_entries;
 	u8 tx_sk_pacing_shift;
+	u8 weight_multiplier;
 };
 
 static inline bool _ieee80211_hw_check(struct ieee80211_hw *hw,
@@ -5393,6 +5397,34 @@ void ieee80211_sta_block_awake(struct ieee80211_hw *hw,
 void ieee80211_send_eosp_nullfunc(struct ieee80211_sta *pubsta, int tid);
 
 /**
+ * ieee80211_sta_register_airtime - register airtime usage for a sta/tid
+ *
+ * Register airtime usage for a given sta on a given tid. The driver can call
+ * this function to notify mac80211 that a station used a certain amount of
+ * airtime. This information will be used by the TXQ scheduler to schedule
+ * stations in a way that ensures airtime fairness.
+ *
+ * The reported airtime should as a minimum include all time that is spent
+ * transmitting to the remote station, including overhead and padding, but not
+ * including time spent waiting for a TXOP. If the time is not reported by the
+ * hardware it can in some cases be calculated from the rate and known frame
+ * composition. When possible, the time should include any failed transmission
+ * attempts.
+ *
+ * The driver can either call this function synchronously for every packet or
+ * aggregate, or asynchronously as airtime usage information becomes available.
+ * TX and RX airtime can be reported together, or separately by setting one of
+ * them to 0.
+ *
+ * @pubsta: the station
+ * @tid: the TID to register airtime for
+ * @tx_airtime: airtime used during TX (in usec)
+ * @rx_airtime: airtime used during RX (in usec)
+ */
+void ieee80211_sta_register_airtime(struct ieee80211_sta *pubsta, u8 tid,
+				    u32 tx_airtime, u32 rx_airtime);
+
+/**
  * ieee80211_iter_keys - iterate keys programmed into the device
  * @hw: pointer obtained from ieee80211_alloc_hw()
  * @vif: virtual interface to iterate, may be %NULL for all
@@ -6150,6 +6182,33 @@ struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
 void ieee80211_txq_schedule_end(struct ieee80211_hw *hw, u8 ac);
 
 /**
+ * ieee80211_txq_may_transmit - check whether TXQ is allowed to transmit
+ *
+ * This function is used to check whether given txq is allowed to transmit by
+ * the airtime scheduler, and can be used by drivers to access the airtime
+ * fairness accounting without going using the scheduling order enfored by
+ * next_txq().
+ *
+ * Returns %true if the airtime scheduler thinks the TXQ should be allowed to
+ * transmit, and %false if it should be throttled. This function can also have
+ * the side effect of rotating the TXQ in the scheduler rotation, which will
+ * eventually bring the deficit to positive and allow the station to transmit
+ * again.
+ *
+ * The API ieee80211_txq_may_transmit() also ensures that TXQ list will be
+ * aligned aginst driver's own round-robin scheduler list. i.e it rotates
+ * the TXQ list till it makes the requested node becomes the first entry
+ * in TXQ list. Thus both the TXQ list and driver's list are in sync. If this
+ * function returns %true, the driver is expected to schedule packets
+ * for transmission, and then return the TXQ through ieee80211_return_txq().
+ *
+ * @hw: pointer as obtained from ieee80211_alloc_hw()
+ * @txq: pointer obtained from station or virtual interface
+ */
+bool ieee80211_txq_may_transmit(struct ieee80211_hw *hw,
+				struct ieee80211_txq *txq);
+
+/**
  * 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.
diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index 818aa0060349..57c59e5ceb98 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -1447,6 +1447,9 @@ static int sta_apply_parameters(struct ieee80211_local *local,
 	if (ieee80211_vif_is_mesh(&sdata->vif))
 		sta_apply_mesh_params(local, sta, params);
 
+	if (params->airtime_weight)
+		sta->airtime_weight = params->airtime_weight;
+
 	/* set the STA state after all sta info from usermode has been set */
 	if (test_sta_flag(sta, WLAN_STA_TDLS_PEER) ||
 	    set & BIT(NL80211_STA_FLAG_ASSOCIATED)) {
diff --git a/net/mac80211/debugfs.c b/net/mac80211/debugfs.c
index 3fe541e358f3..81c5fec2eae7 100644
--- a/net/mac80211/debugfs.c
+++ b/net/mac80211/debugfs.c
@@ -383,6 +383,9 @@ void debugfs_hw_add(struct ieee80211_local *local)
 	if (local->ops->wake_tx_queue)
 		DEBUGFS_ADD_MODE(aqm, 0600);
 
+	debugfs_create_u16("airtime_flags", 0600,
+			   phyd, &local->airtime_flags);
+
 	statsd = debugfs_create_dir("statistics", phyd);
 
 	/* if the dir failed, don't put all the other things into the root! */
diff --git a/net/mac80211/debugfs_sta.c b/net/mac80211/debugfs_sta.c
index af5185a836e5..b9686147a8b0 100644
--- a/net/mac80211/debugfs_sta.c
+++ b/net/mac80211/debugfs_sta.c
@@ -181,9 +181,9 @@ static ssize_t sta_aqm_read(struct file *file, char __user *userbuf,
 			       txqi->tin.tx_bytes,
 			       txqi->tin.tx_packets,
 			       txqi->flags,
-			       txqi->flags & (1<<IEEE80211_TXQ_STOP) ? "STOP" : "RUN",
-			       txqi->flags & (1<<IEEE80211_TXQ_AMPDU) ? " AMPDU" : "",
-			       txqi->flags & (1<<IEEE80211_TXQ_NO_AMSDU) ? " NO-AMSDU" : "");
+			       test_bit(IEEE80211_TXQ_STOP, &txqi->flags) ? "STOP" : "RUN",
+			       test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags) ? " AMPDU" : "",
+			       test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags) ? " NO-AMSDU" : "");
 	}
 
 	rcu_read_unlock();
@@ -195,6 +195,64 @@ static ssize_t sta_aqm_read(struct file *file, char __user *userbuf,
 }
 STA_OPS(aqm);
 
+static ssize_t sta_airtime_read(struct file *file, char __user *userbuf,
+				size_t count, loff_t *ppos)
+{
+	struct sta_info *sta = file->private_data;
+	struct ieee80211_local *local = sta->sdata->local;
+	size_t bufsz = 200;
+	char *buf = kzalloc(bufsz, GFP_KERNEL), *p = buf;
+	u64 rx_airtime = 0, tx_airtime = 0;
+	s64 deficit[IEEE80211_NUM_ACS];
+	ssize_t rv;
+	int ac;
+
+	if (!buf)
+		return -ENOMEM;
+
+	for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
+		spin_lock_bh(&local->active_txq_lock[ac]);
+		rx_airtime += sta->airtime[ac].rx_airtime;
+		tx_airtime += sta->airtime[ac].tx_airtime;
+		deficit[ac] = sta->airtime[ac].deficit;
+		spin_unlock_bh(&local->active_txq_lock[ac]);
+	}
+
+	p += scnprintf(p, bufsz + buf - p,
+		"RX: %llu us\nTX: %llu us\nWeight: %u\n"
+		"Deficit: VO: %lld us VI: %lld us BE: %lld us BK: %lld us\n",
+		rx_airtime,
+		tx_airtime,
+		sta->airtime_weight,
+		deficit[0],
+		deficit[1],
+		deficit[2],
+		deficit[3]);
+
+	rv = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
+	kfree(buf);
+	return rv;
+}
+
+static ssize_t sta_airtime_write(struct file *file, const char __user *userbuf,
+				 size_t count, loff_t *ppos)
+{
+	struct sta_info *sta = file->private_data;
+	struct ieee80211_local *local = sta->sdata->local;
+	int ac;
+
+	for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
+		spin_lock_bh(&local->active_txq_lock[ac]);
+		sta->airtime[ac].rx_airtime = 0;
+		sta->airtime[ac].tx_airtime = 0;
+		sta->airtime[ac].deficit = sta->airtime_weight;
+		spin_unlock_bh(&local->active_txq_lock[ac]);
+	}
+
+	return count;
+}
+STA_OPS_RW(airtime);
+
 static ssize_t sta_agg_status_read(struct file *file, char __user *userbuf,
 					size_t count, loff_t *ppos)
 {
@@ -906,6 +964,10 @@ void ieee80211_sta_debugfs_add(struct sta_info *sta)
 	if (local->ops->wake_tx_queue)
 		DEBUGFS_ADD(aqm);
 
+	if (wiphy_ext_feature_isset(local->hw.wiphy,
+				    NL80211_EXT_FEATURE_AIRTIME_FAIRNESS))
+		DEBUGFS_ADD(airtime);
+
 	if (sizeof(sta->driver_buffered_tids) == sizeof(u32))
 		debugfs_create_x32("driver_buffered_tids", 0400,
 				   sta->debugfs_dir,
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 33763a2eac81..c5b6ba571288 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -1137,6 +1137,8 @@ struct ieee80211_local {
 	struct list_head active_txqs[IEEE80211_NUM_ACS];
 	u16 schedule_round[IEEE80211_NUM_ACS];
 
+	u16 airtime_flags;
+
 	const struct ieee80211_ops *ops;
 
 	/*
diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index 5d292ef0a544..d6e19b7a0725 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -667,6 +667,7 @@ struct ieee80211_hw *ieee80211_alloc_hw_nm(size_t priv_data_len,
 		INIT_LIST_HEAD(&local->active_txqs[i]);
 		spin_lock_init(&local->active_txq_lock[i]);
 	}
+	local->airtime_flags = AIRTIME_USE_TX | AIRTIME_USE_RX;
 
 	INIT_LIST_HEAD(&local->chanctx_list);
 	mutex_init(&local->chanctx_mtx);
@@ -1153,6 +1154,9 @@ int ieee80211_register_hw(struct ieee80211_hw *hw)
 	if (!local->hw.max_nan_de_entries)
 		local->hw.max_nan_de_entries = IEEE80211_MAX_NAN_INSTANCE_ID;
 
+	if (!local->hw.weight_multiplier)
+		local->hw.weight_multiplier = 1;
+
 	result = ieee80211_wep_init(local);
 	if (result < 0)
 		wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c
index c2f5cb7df54f..adf56266cca3 100644
--- a/net/mac80211/sta_info.c
+++ b/net/mac80211/sta_info.c
@@ -90,7 +90,6 @@ static void __cleanup_single_sta(struct sta_info *sta)
 	struct tid_ampdu_tx *tid_tx;
 	struct ieee80211_sub_if_data *sdata = sta->sdata;
 	struct ieee80211_local *local = sdata->local;
-	struct fq *fq = &local->fq;
 	struct ps_data *ps;
 
 	if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
@@ -120,9 +119,7 @@ static void __cleanup_single_sta(struct sta_info *sta)
 
 			txqi = to_txq_info(sta->sta.txq[i]);
 
-			spin_lock_bh(&fq->lock);
 			ieee80211_txq_purge(local, txqi);
-			spin_unlock_bh(&fq->lock);
 		}
 	}
 
@@ -387,9 +384,12 @@ struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
 	if (sta_prepare_rate_control(local, sta, gfp))
 		goto free_txq;
 
+	sta->airtime_weight = IEEE80211_DEFAULT_AIRTIME_WEIGHT;
+
 	for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 		skb_queue_head_init(&sta->ps_tx_buf[i]);
 		skb_queue_head_init(&sta->tx_filtered[i]);
+		sta->airtime[i].deficit = sta->airtime_weight;
 	}
 
 	for (i = 0; i < IEEE80211_NUM_TIDS; i++)
@@ -1826,6 +1826,27 @@ void ieee80211_sta_set_buffered(struct ieee80211_sta *pubsta,
 }
 EXPORT_SYMBOL(ieee80211_sta_set_buffered);
 
+void ieee80211_sta_register_airtime(struct ieee80211_sta *pubsta, u8 tid,
+				    u32 tx_airtime, u32 rx_airtime)
+{
+	struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
+	struct ieee80211_local *local = sta->sdata->local;
+	u8 ac = ieee80211_ac_from_tid(tid);
+	u32 airtime = 0;
+
+	if (sta->local->airtime_flags & AIRTIME_USE_TX)
+		airtime += tx_airtime;
+	if (sta->local->airtime_flags & AIRTIME_USE_RX)
+		airtime += rx_airtime;
+
+	spin_lock_bh(&local->active_txq_lock[ac]);
+	sta->airtime[ac].tx_airtime += tx_airtime;
+	sta->airtime[ac].rx_airtime += rx_airtime;
+	sta->airtime[ac].deficit -= airtime;
+	spin_unlock_bh(&local->active_txq_lock[ac]);
+}
+EXPORT_SYMBOL(ieee80211_sta_register_airtime);
+
 int sta_info_move_state(struct sta_info *sta,
 			enum ieee80211_sta_state new_state)
 {
@@ -2188,6 +2209,23 @@ void sta_set_sinfo(struct sta_info *sta, struct station_info *sinfo,
 		sinfo->filled |= BIT_ULL(NL80211_STA_INFO_TX_FAILED);
 	}
 
+	if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_RX_DURATION))) {
+		for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
+			sinfo->rx_duration += sta->airtime[ac].rx_airtime;
+		sinfo->filled |= BIT_ULL(NL80211_STA_INFO_RX_DURATION);
+	}
+
+	if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_TX_DURATION))) {
+		for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
+			sinfo->tx_duration += sta->airtime[ac].tx_airtime;
+		sinfo->filled |= BIT_ULL(NL80211_STA_INFO_TX_DURATION);
+	}
+
+	if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_AIRTIME_WEIGHT))) {
+		sinfo->airtime_weight = sta->airtime_weight;
+		sinfo->filled |= BIT_ULL(NL80211_STA_INFO_AIRTIME_WEIGHT);
+	}
+
 	sinfo->rx_dropped_misc = sta->rx_stats.dropped;
 	if (sta->pcpu_rx_stats) {
 		for_each_possible_cpu(cpu) {
diff --git a/net/mac80211/sta_info.h b/net/mac80211/sta_info.h
index 9a04327d71d1..b1b0fd6a2e21 100644
--- a/net/mac80211/sta_info.h
+++ b/net/mac80211/sta_info.h
@@ -127,6 +127,16 @@ enum ieee80211_agg_stop_reason {
 	AGG_STOP_DESTROY_STA,
 };
 
+/* Debugfs flags to enable/disable use of RX/TX airtime in scheduler */
+#define AIRTIME_USE_TX		BIT(0)
+#define AIRTIME_USE_RX		BIT(1)
+
+struct airtime_info {
+	u64 rx_airtime;
+	u64 tx_airtime;
+	s64 deficit;
+};
+
 struct sta_info;
 
 /**
@@ -563,6 +573,9 @@ struct sta_info {
 	} tx_stats;
 	u16 tid_seq[IEEE80211_QOS_CTL_TID_MASK + 1];
 
+	struct airtime_info airtime[IEEE80211_NUM_ACS];
+	u16 airtime_weight;
+
 	/*
 	 * Aggregation information, locked with lock.
 	 */
diff --git a/net/mac80211/status.c b/net/mac80211/status.c
index 3f0b96e1e02f..5b9952b1caf3 100644
--- a/net/mac80211/status.c
+++ b/net/mac80211/status.c
@@ -823,6 +823,12 @@ static void __ieee80211_tx_status(struct ieee80211_hw *hw,
 			ieee80211_sta_tx_notify(sta->sdata, (void *) skb->data,
 						acked, info->status.tx_time);
 
+		if (info->status.tx_time &&
+		    wiphy_ext_feature_isset(local->hw.wiphy,
+					    NL80211_EXT_FEATURE_AIRTIME_FAIRNESS))
+			ieee80211_sta_register_airtime(&sta->sta, tid,
+						       info->status.tx_time, 0);
+
 		if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
 			if (info->flags & IEEE80211_TX_STAT_ACK) {
 				if (sta->status_stats.lost_packets)
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index ae897c4d2520..41fbb6291eb0 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -1488,8 +1488,11 @@ void ieee80211_txq_purge(struct ieee80211_local *local,
 	struct fq *fq = &local->fq;
 	struct fq_tin *tin = &txqi->tin;
 
+	spin_lock_bh(&fq->lock);
 	fq_tin_reset(fq, tin, fq_skb_free_func);
 	ieee80211_purge_tx_queue(&local->hw, &txqi->frags);
+	spin_unlock_bh(&fq->lock);
+
 	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]);
@@ -3638,11 +3641,28 @@ struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac)
 
 	lockdep_assert_held(&local->active_txq_lock[ac]);
 
+ begin:
 	txqi = list_first_entry_or_null(&local->active_txqs[ac],
 					struct txq_info,
 					schedule_order);
+	if (!txqi)
+		return NULL;
+
+	if (txqi->txq.sta) {
+		struct sta_info *sta = container_of(txqi->txq.sta,
+						struct sta_info, sta);
+
+		if (sta->airtime[txqi->txq.ac].deficit < 0) {
+			sta->airtime[txqi->txq.ac].deficit +=
+				sta->airtime_weight;
+			list_move_tail(&txqi->schedule_order,
+				       &local->active_txqs[txqi->txq.ac]);
+			goto begin;
+		}
+	}
+
 
-	if (!txqi || txqi->schedule_round == local->schedule_round[ac])
+	if (txqi->schedule_round == local->schedule_round[ac])
 		return NULL;
 
 	list_del_init(&txqi->schedule_order);
@@ -3660,12 +3680,74 @@ void ieee80211_return_txq(struct ieee80211_hw *hw,
 	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]);
+	    (!skb_queue_empty(&txqi->frags) || txqi->tin.backlog_packets)) {
+		/* If airtime accounting is active, always enqueue STAs at the
+		 * head of the list to ensure that they only get moved to the
+		 * back by the airtime DRR scheduler once they have a negative
+		 * deficit. A station that already has a negative deficit will
+		 * get immediately moved to the back of the list on the next
+		 * call to ieee80211_next_txq().
+		 */
+		if (txqi->txq.sta &&
+		    wiphy_ext_feature_isset(local->hw.wiphy,
+					    NL80211_EXT_FEATURE_AIRTIME_FAIRNESS))
+			list_add(&txqi->schedule_order,
+				 &local->active_txqs[txq->ac]);
+		else
+			list_add_tail(&txqi->schedule_order,
+				      &local->active_txqs[txq->ac]);
+	}
 }
 EXPORT_SYMBOL(ieee80211_return_txq);
 
+bool ieee80211_txq_may_transmit(struct ieee80211_hw *hw,
+				struct ieee80211_txq *txq)
+{
+	struct ieee80211_local *local = hw_to_local(hw);
+	struct txq_info *iter, *tmp, *txqi = to_txq_info(txq);
+	struct sta_info *sta;
+	u8 ac = txq->ac;
+
+	lockdep_assert_held(&local->active_txq_lock[ac]);
+
+	if (!txqi->txq.sta)
+		goto out;
+
+	if (list_empty(&txqi->schedule_order))
+		goto out;
+
+	list_for_each_entry_safe(iter, tmp, &local->active_txqs[ac],
+				 schedule_order) {
+		if (iter == txqi)
+			break;
+
+		if (!iter->txq.sta) {
+			list_move_tail(&iter->schedule_order,
+				       &local->active_txqs[ac]);
+			continue;
+		}
+		sta = container_of(iter->txq.sta, struct sta_info, sta);
+		if (sta->airtime[ac].deficit < 0)
+			sta->airtime[ac].deficit += sta->airtime_weight;
+		list_move_tail(&iter->schedule_order, &local->active_txqs[ac]);
+	}
+
+	sta = container_of(txqi->txq.sta, struct sta_info, sta);
+	if (sta->airtime[ac].deficit >= 0)
+		goto out;
+
+	sta->airtime[ac].deficit += sta->airtime_weight;
+	list_move_tail(&txqi->schedule_order, &local->active_txqs[ac]);
+
+	return false;
+out:
+	if (!list_empty(&txqi->schedule_order))
+		list_del_init(&txqi->schedule_order);
+
+	return true;
+}
+EXPORT_SYMBOL(ieee80211_txq_may_transmit);
+
 void ieee80211_txq_schedule_start(struct ieee80211_hw *hw, u8 ac)
 {
 	struct ieee80211_local *local = hw_to_local(hw);
-- 
1.9.1

[PATCH v5 4/6] ath9k: Switch to mac80211 TXQ scheduling and airtime APIs

[Rajkumar Manoharan]

From: Toke Høiland-Jørgensen <toke@toke.dk>

This moves the ath9k driver to use the mac80211 TXQ scheduling and
airtime accounting APIs, removing the corresponding state tracking
inside the driver.

Signed-off-by: Toke Høiland-Jørgensen <toke@toke.dk>
[rmanohar@codeaurora.org: fixed checkpatch error and warnings]
Signed-off-by: Rajkumar Manoharan <rmanohar@codeaurora.org>
---
 drivers/net/wireless/ath/ath9k/ath9k.h     |  14 --
 drivers/net/wireless/ath/ath9k/debug.c     |   3 -
 drivers/net/wireless/ath/ath9k/debug.h     |   8 -
 drivers/net/wireless/ath/ath9k/debug_sta.c |  70 ---------
 drivers/net/wireless/ath/ath9k/init.c      |   3 +-
 drivers/net/wireless/ath/ath9k/recv.c      |   9 +-
 drivers/net/wireless/ath/ath9k/xmit.c      | 244 +++++++++--------------------
 7 files changed, 75 insertions(+), 276 deletions(-)

diff --git a/drivers/net/wireless/ath/ath9k/ath9k.h b/drivers/net/wireless/ath/ath9k/ath9k.h
index 21ba20981a80..90b56766dab1 100644
--- a/drivers/net/wireless/ath/ath9k/ath9k.h
+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
@@ -112,8 +112,6 @@ int ath_descdma_setup(struct ath_softc *sc, struct ath_descdma *dd,
 #define ATH_TXFIFO_DEPTH           8
 #define ATH_TX_ERROR               0x01
 
-#define ATH_AIRTIME_QUANTUM        300 /* usec */
-
 /* Stop tx traffic 1ms before the GO goes away */
 #define ATH_P2P_PS_STOP_TIME       1000
 
@@ -246,10 +244,8 @@ struct ath_atx_tid {
 	s8 bar_index;
 	bool active;
 	bool clear_ps_filter;
-	bool has_queued;
 };
 
-void __ath_tx_queue_tid(struct ath_softc *sc, struct ath_atx_tid *tid);
 void ath_tx_queue_tid(struct ath_softc *sc, struct ath_atx_tid *tid);
 
 struct ath_node {
@@ -263,12 +259,9 @@ struct ath_node {
 
 	bool sleeping;
 	bool no_ps_filter;
-	s64 airtime_deficit[IEEE80211_NUM_ACS];
-	u32 airtime_rx_start;
 
 #ifdef CONFIG_ATH9K_STATION_STATISTICS
 	struct ath_rx_rate_stats rx_rate_stats;
-	struct ath_airtime_stats airtime_stats;
 #endif
 	u8 key_idx[4];
 
@@ -986,11 +979,6 @@ struct ath_ant_comb {
 
 #define ATH9K_NUM_CHANCTX  2 /* supports 2 operating channels */
 
-#define AIRTIME_USE_TX		BIT(0)
-#define AIRTIME_USE_RX		BIT(1)
-#define AIRTIME_USE_NEW_QUEUES	BIT(2)
-#define AIRTIME_ACTIVE(flags) (!!(flags & (AIRTIME_USE_TX|AIRTIME_USE_RX)))
-
 struct ath_softc {
 	struct ieee80211_hw *hw;
 	struct device *dev;
@@ -1034,8 +1022,6 @@ struct ath_softc {
 	short nbcnvifs;
 	unsigned long ps_usecount;
 
-	u16 airtime_flags; /* AIRTIME_* */
-
 	struct ath_rx rx;
 	struct ath_tx tx;
 	struct ath_beacon beacon;
diff --git a/drivers/net/wireless/ath/ath9k/debug.c b/drivers/net/wireless/ath/ath9k/debug.c
index 4399e9ad058f..0dfea5d6e949 100644
--- a/drivers/net/wireless/ath/ath9k/debug.c
+++ b/drivers/net/wireless/ath/ath9k/debug.c
@@ -1443,9 +1443,6 @@ int ath9k_init_debug(struct ath_hw *ah)
 #endif
 	debugfs_create_file("tpc", 0600, sc->debug.debugfs_phy, sc, &fops_tpc);
 
-	debugfs_create_u16("airtime_flags", 0600,
-			   sc->debug.debugfs_phy, &sc->airtime_flags);
-
 	debugfs_create_file("nf_override", 0600,
 			    sc->debug.debugfs_phy, sc, &fops_nf_override);
 
diff --git a/drivers/net/wireless/ath/ath9k/debug.h b/drivers/net/wireless/ath/ath9k/debug.h
index 79607db14387..33826aa13687 100644
--- a/drivers/net/wireless/ath/ath9k/debug.h
+++ b/drivers/net/wireless/ath/ath9k/debug.h
@@ -319,20 +319,12 @@ static inline void ath9k_debug_stat_ant(struct ath_softc *sc,
 void ath_debug_rate_stats(struct ath_softc *sc,
 			  struct ath_rx_status *rs,
 			  struct sk_buff *skb);
-void ath_debug_airtime(struct ath_softc *sc,
-		       struct ath_node *an,
-		       u32 rx, u32 tx);
 #else
 static inline void ath_debug_rate_stats(struct ath_softc *sc,
 					struct ath_rx_status *rs,
 					struct sk_buff *skb)
 {
 }
-static inline void ath_debug_airtime(struct ath_softc *sc,
-			      struct ath_node *an,
-			      u32 rx, u32 tx)
-{
-}
 #endif /* CONFIG_ATH9K_STATION_STATISTICS */
 
 #endif /* DEBUG_H */
diff --git a/drivers/net/wireless/ath/ath9k/debug_sta.c b/drivers/net/wireless/ath/ath9k/debug_sta.c
index e8fcd3e1c470..d95cabddce33 100644
--- a/drivers/net/wireless/ath/ath9k/debug_sta.c
+++ b/drivers/net/wireless/ath/ath9k/debug_sta.c
@@ -242,75 +242,6 @@ static ssize_t read_file_node_recv(struct file *file, char __user *user_buf,
 	.llseek = default_llseek,
 };
 
-void ath_debug_airtime(struct ath_softc *sc,
-		struct ath_node *an,
-		u32 rx,
-		u32 tx)
-{
-	struct ath_airtime_stats *astats = &an->airtime_stats;
-
-	astats->rx_airtime += rx;
-	astats->tx_airtime += tx;
-}
-
-static ssize_t read_airtime(struct file *file, char __user *user_buf,
-			size_t count, loff_t *ppos)
-{
-	struct ath_node *an = file->private_data;
-	struct ath_airtime_stats *astats;
-	static const char *qname[4] = {
-		"VO", "VI", "BE", "BK"
-	};
-	u32 len = 0, size = 256;
-	char *buf;
-	size_t retval;
-	int i;
-
-	buf = kzalloc(size, GFP_KERNEL);
-	if (buf == NULL)
-		return -ENOMEM;
-
-	astats = &an->airtime_stats;
-
-	len += scnprintf(buf + len, size - len, "RX: %u us\n", astats->rx_airtime);
-	len += scnprintf(buf + len, size - len, "TX: %u us\n", astats->tx_airtime);
-	len += scnprintf(buf + len, size - len, "Deficit: ");
-	for (i = 0; i < 4; i++)
-		len += scnprintf(buf+len, size - len, "%s: %lld us ", qname[i], an->airtime_deficit[i]);
-	if (len < size)
-		buf[len++] = '\n';
-
-	retval = simple_read_from_buffer(user_buf, count, ppos, buf, len);
-	kfree(buf);
-
-	return retval;
-}
-
-static ssize_t
-write_airtime_reset_stub(struct file *file, const char __user *ubuf,
-		   size_t count, loff_t *ppos)
-{
-	struct ath_node *an = file->private_data;
-	struct ath_airtime_stats *astats;
-	int i;
-
-	astats = &an->airtime_stats;
-	astats->rx_airtime = 0;
-	astats->tx_airtime = 0;
-	for (i = 0; i < 4; i++)
-		an->airtime_deficit[i] = ATH_AIRTIME_QUANTUM;
-	return count;
-}
-
-static const struct file_operations fops_airtime = {
-	.read = read_airtime,
-	.write = write_airtime_reset_stub,
-	.open = simple_open,
-	.owner = THIS_MODULE,
-	.llseek = default_llseek,
-};
-
-
 void ath9k_sta_add_debugfs(struct ieee80211_hw *hw,
 			   struct ieee80211_vif *vif,
 			   struct ieee80211_sta *sta,
@@ -320,5 +251,4 @@ void ath9k_sta_add_debugfs(struct ieee80211_hw *hw,
 
 	debugfs_create_file("node_aggr", 0444, dir, an, &fops_node_aggr);
 	debugfs_create_file("node_recv", 0444, dir, an, &fops_node_recv);
-	debugfs_create_file("airtime", 0644, dir, an, &fops_airtime);
 }
diff --git a/drivers/net/wireless/ath/ath9k/init.c b/drivers/net/wireless/ath/ath9k/init.c
index c070a9e51ebf..45a31f8a1514 100644
--- a/drivers/net/wireless/ath/ath9k/init.c
+++ b/drivers/net/wireless/ath/ath9k/init.c
@@ -676,8 +676,6 @@ static int ath9k_init_softc(u16 devid, struct ath_softc *sc,
 
 	/* Will be cleared in ath9k_start() */
 	set_bit(ATH_OP_INVALID, &common->op_flags);
-	sc->airtime_flags = (AIRTIME_USE_TX | AIRTIME_USE_RX |
-			     AIRTIME_USE_NEW_QUEUES);
 
 	sc->sc_ah = ah;
 	sc->dfs_detector = dfs_pattern_detector_init(common, NL80211_DFS_UNSET);
@@ -1013,6 +1011,7 @@ static void ath9k_set_hw_capab(struct ath_softc *sc, struct ieee80211_hw *hw)
 	SET_IEEE80211_PERM_ADDR(hw, common->macaddr);
 
 	wiphy_ext_feature_set(hw->wiphy, NL80211_EXT_FEATURE_CQM_RSSI_LIST);
+	wiphy_ext_feature_set(hw->wiphy, NL80211_EXT_FEATURE_AIRTIME_FAIRNESS);
 }
 
 int ath9k_init_device(u16 devid, struct ath_softc *sc,
diff --git a/drivers/net/wireless/ath/ath9k/recv.c b/drivers/net/wireless/ath/ath9k/recv.c
index 30d1bd832d90..285a62d3019d 100644
--- a/drivers/net/wireless/ath/ath9k/recv.c
+++ b/drivers/net/wireless/ath/ath9k/recv.c
@@ -1054,14 +1054,7 @@ static void ath_rx_count_airtime(struct ath_softc *sc,
 						len, rxs->rate_idx, is_sp);
 	}
 
- 	if (!!(sc->airtime_flags & AIRTIME_USE_RX)) {
-		spin_lock_bh(&acq->lock);
-		an->airtime_deficit[acno] -= airtime;
-		if (an->airtime_deficit[acno] <= 0)
-			__ath_tx_queue_tid(sc, ATH_AN_2_TID(an, tidno));
-		spin_unlock_bh(&acq->lock);
-	}
-	ath_debug_airtime(sc, an, airtime, 0);
+	ieee80211_sta_register_airtime(sta, tidno, 0, airtime);
 exit:
 	rcu_read_unlock();
 }
diff --git a/drivers/net/wireless/ath/ath9k/xmit.c b/drivers/net/wireless/ath/ath9k/xmit.c
index 25b3fc82d4ac..d150db99451f 100644
--- a/drivers/net/wireless/ath/ath9k/xmit.c
+++ b/drivers/net/wireless/ath/ath9k/xmit.c
@@ -113,44 +113,14 @@ void ath_txq_unlock_complete(struct ath_softc *sc, struct ath_txq *txq)
 		ath_tx_status(hw, skb);
 }
 
-void __ath_tx_queue_tid(struct ath_softc *sc, struct ath_atx_tid *tid)
-{
-	struct ath_vif *avp = (struct ath_vif *) tid->an->vif->drv_priv;
-	struct ath_chanctx *ctx = avp->chanctx;
-	struct ath_acq *acq;
-	struct list_head *tid_list;
-	u8 acno = TID_TO_WME_AC(tid->tidno);
-
-	if (!ctx || !list_empty(&tid->list))
-		return;
-
-
-	acq = &ctx->acq[acno];
-	if ((sc->airtime_flags & AIRTIME_USE_NEW_QUEUES) &&
-	    tid->an->airtime_deficit[acno] > 0)
-		tid_list = &acq->acq_new;
-	else
-		tid_list = &acq->acq_old;
-
-	list_add_tail(&tid->list, tid_list);
-}
-
 void ath_tx_queue_tid(struct ath_softc *sc, struct ath_atx_tid *tid)
 {
-	struct ath_vif *avp = (struct ath_vif *) tid->an->vif->drv_priv;
-	struct ath_chanctx *ctx = avp->chanctx;
-	struct ath_acq *acq;
+	struct ieee80211_txq *queue =
+		container_of((void *)tid, struct ieee80211_txq, drv_priv);
 
-	if (!ctx || !list_empty(&tid->list))
-		return;
-
-	acq = &ctx->acq[TID_TO_WME_AC(tid->tidno)];
-	spin_lock_bh(&acq->lock);
-	__ath_tx_queue_tid(sc, tid);
-	spin_unlock_bh(&acq->lock);
+	ieee80211_return_txq(sc->hw, queue);
 }
 
-
 void ath9k_wake_tx_queue(struct ieee80211_hw *hw, struct ieee80211_txq *queue)
 {
 	struct ath_softc *sc = hw->priv;
@@ -163,11 +133,7 @@ void ath9k_wake_tx_queue(struct ieee80211_hw *hw, struct ieee80211_txq *queue)
 		tid->tidno);
 
 	ath_txq_lock(sc, txq);
-
-	tid->has_queued = true;
-	ath_tx_queue_tid(sc, tid);
 	ath_txq_schedule(sc, txq);
-
 	ath_txq_unlock(sc, txq);
 }
 
@@ -217,8 +183,8 @@ static void ath_txq_skb_done(struct ath_softc *sc, struct ath_txq *txq,
 	return ATH_AN_2_TID(an, tidno);
 }
 
-static struct sk_buff *
-ath_tid_pull(struct ath_atx_tid *tid)
+static int
+ath_tid_pull(struct ath_atx_tid *tid, struct sk_buff **skbuf)
 {
 	struct ieee80211_txq *txq = container_of((void*)tid, struct ieee80211_txq, drv_priv);
 	struct ath_softc *sc = tid->an->sc;
@@ -229,20 +195,16 @@ static void ath_txq_skb_done(struct ath_softc *sc, struct ath_txq *txq,
 	};
 	struct sk_buff *skb;
 	struct ath_frame_info *fi;
-	int q;
-
-	if (!tid->has_queued)
-		return NULL;
+	int q, ret;
 
 	skb = ieee80211_tx_dequeue(hw, txq);
-	if (!skb) {
-		tid->has_queued = false;
-		return NULL;
-	}
+	if (!skb)
+		return -ENOENT;
 
-	if (ath_tx_prepare(hw, skb, &txctl)) {
+	ret = ath_tx_prepare(hw, skb, &txctl);
+	if (ret) {
 		ieee80211_free_txskb(hw, skb);
-		return NULL;
+		return ret;
 	}
 
 	q = skb_get_queue_mapping(skb);
@@ -252,24 +214,19 @@ static void ath_txq_skb_done(struct ath_softc *sc, struct ath_txq *txq,
 		++tid->txq->pending_frames;
 	}
 
-	return skb;
-}
-
-
-static bool ath_tid_has_buffered(struct ath_atx_tid *tid)
-{
-	return !skb_queue_empty(&tid->retry_q) || tid->has_queued;
+	*skbuf = skb;
+	return 0;
 }
 
-static struct sk_buff *ath_tid_dequeue(struct ath_atx_tid *tid)
+static int ath_tid_dequeue(struct ath_atx_tid *tid,
+			   struct sk_buff **skb)
 {
-	struct sk_buff *skb;
-
-	skb = __skb_dequeue(&tid->retry_q);
-	if (!skb)
-		skb = ath_tid_pull(tid);
+	int ret = 0;
+	*skb = __skb_dequeue(&tid->retry_q);
+	if (!*skb)
+		ret = ath_tid_pull(tid, skb);
 
-	return skb;
+	return ret;
 }
 
 static void ath_tx_flush_tid(struct ath_softc *sc, struct ath_atx_tid *tid)
@@ -365,11 +322,12 @@ static void ath_tid_drain(struct ath_softc *sc, struct ath_txq *txq,
 	struct list_head bf_head;
 	struct ath_tx_status ts;
 	struct ath_frame_info *fi;
+	int ret;
 
 	memset(&ts, 0, sizeof(ts));
 	INIT_LIST_HEAD(&bf_head);
 
-	while ((skb = ath_tid_dequeue(tid))) {
+	while ((ret = ath_tid_dequeue(tid, &skb)) == 0) {
 		fi = get_frame_info(skb);
 		bf = fi->bf;
 
@@ -681,7 +639,6 @@ static void ath_tx_complete_aggr(struct ath_softc *sc, struct ath_txq *txq,
 		skb_queue_splice_tail(&bf_pending, &tid->retry_q);
 		if (!an->sleeping) {
 			ath_tx_queue_tid(sc, tid);
-
 			if (ts->ts_status & (ATH9K_TXERR_FILT | ATH9K_TXERR_XRETRY))
 				tid->clear_ps_filter = true;
 		}
@@ -708,11 +665,11 @@ static bool bf_is_ampdu_not_probing(struct ath_buf *bf)
     return bf_isampdu(bf) && !(info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE);
 }
 
-static void ath_tx_count_airtime(struct ath_softc *sc, struct ath_node *an,
-				 struct ath_atx_tid *tid, struct ath_buf *bf,
+static void ath_tx_count_airtime(struct ath_softc *sc,
+				 struct ieee80211_sta *sta,
+				 struct ath_buf *bf,
 				 struct ath_tx_status *ts)
 {
-	struct ath_txq *txq = tid->txq;
 	u32 airtime = 0;
 	int i;
 
@@ -722,17 +679,7 @@ static void ath_tx_count_airtime(struct ath_softc *sc, struct ath_node *an,
 		airtime += rate_dur * bf->rates[i].count;
 	}
 
-	if (sc->airtime_flags & AIRTIME_USE_TX) {
-		int q = txq->mac80211_qnum;
-		struct ath_acq *acq = &sc->cur_chan->acq[q];
-
-		spin_lock_bh(&acq->lock);
-		an->airtime_deficit[q] -= airtime;
-		if (an->airtime_deficit[q] <= 0)
-			__ath_tx_queue_tid(sc, tid);
-		spin_unlock_bh(&acq->lock);
-	}
-	ath_debug_airtime(sc, an, 0, airtime);
+	ieee80211_sta_register_airtime(sta, ts->tid, airtime, 0);
 }
 
 static void ath_tx_process_buffer(struct ath_softc *sc, struct ath_txq *txq,
@@ -762,7 +709,7 @@ static void ath_tx_process_buffer(struct ath_softc *sc, struct ath_txq *txq,
 	if (sta) {
 		struct ath_node *an = (struct ath_node *)sta->drv_priv;
 		tid = ath_get_skb_tid(sc, an, bf->bf_mpdu);
-		ath_tx_count_airtime(sc, an, tid, bf, ts);
+		ath_tx_count_airtime(sc, sta, bf, ts);
 		if (ts->ts_status & (ATH9K_TXERR_FILT | ATH9K_TXERR_XRETRY))
 			tid->clear_ps_filter = true;
 	}
@@ -946,20 +893,21 @@ static int ath_compute_num_delims(struct ath_softc *sc, struct ath_atx_tid *tid,
 	return ndelim;
 }
 
-static struct ath_buf *
+static int
 ath_tx_get_tid_subframe(struct ath_softc *sc, struct ath_txq *txq,
-			struct ath_atx_tid *tid)
+			struct ath_atx_tid *tid, struct ath_buf **buf)
 {
 	struct ieee80211_tx_info *tx_info;
 	struct ath_frame_info *fi;
-	struct sk_buff *skb, *first_skb = NULL;
 	struct ath_buf *bf;
+	struct sk_buff *skb, *first_skb = NULL;
 	u16 seqno;
+	int ret;
 
 	while (1) {
-		skb = ath_tid_dequeue(tid);
-		if (!skb)
-			break;
+		ret = ath_tid_dequeue(tid, &skb);
+		if (ret < 0)
+			return ret;
 
 		fi = get_frame_info(skb);
 		bf = fi->bf;
@@ -991,7 +939,7 @@ static int ath_compute_num_delims(struct ath_softc *sc, struct ath_atx_tid *tid,
 
 		if (!(tx_info->flags & IEEE80211_TX_CTL_AMPDU)) {
 			bf->bf_state.bf_type = 0;
-			return bf;
+			break;
 		}
 
 		bf->bf_state.bf_type = BUF_AMPDU | BUF_AGGR;
@@ -1010,7 +958,7 @@ static int ath_compute_num_delims(struct ath_softc *sc, struct ath_atx_tid *tid,
 					first_skb = skb;
 				continue;
 			}
-			break;
+			return -EINPROGRESS;
 		}
 
 		if (tid->bar_index > ATH_BA_INDEX(tid->seq_start, seqno)) {
@@ -1027,10 +975,11 @@ static int ath_compute_num_delims(struct ath_softc *sc, struct ath_atx_tid *tid,
 		if (bf_isampdu(bf))
 			ath_tx_addto_baw(sc, tid, bf);
 
-		return bf;
+		break;
 	}
 
-	return NULL;
+	*buf = bf;
+	return 0;
 }
 
 static int
@@ -1040,7 +989,7 @@ static int ath_compute_num_delims(struct ath_softc *sc, struct ath_atx_tid *tid,
 {
 #define PADBYTES(_len) ((4 - ((_len) % 4)) % 4)
 	struct ath_buf *bf = bf_first, *bf_prev = NULL;
-	int nframes = 0, ndelim;
+	int nframes = 0, ndelim, ret;
 	u16 aggr_limit = 0, al = 0, bpad = 0,
 	    al_delta, h_baw = tid->baw_size / 2;
 	struct ieee80211_tx_info *tx_info;
@@ -1092,7 +1041,9 @@ static int ath_compute_num_delims(struct ath_softc *sc, struct ath_atx_tid *tid,
 
 		bf_prev = bf;
 
-		bf = ath_tx_get_tid_subframe(sc, txq, tid);
+		ret = ath_tx_get_tid_subframe(sc, txq, tid, &bf);
+		if (ret < 0)
+			break;
 	}
 	goto finish;
 stop:
@@ -1489,7 +1440,7 @@ static void ath_tx_fill_desc(struct ath_softc *sc, struct ath_buf *bf,
 		  struct ath_buf *bf_first)
 {
 	struct ath_buf *bf = bf_first, *bf_prev = NULL;
-	int nframes = 0;
+	int nframes = 0, ret;
 
 	do {
 		struct ieee80211_tx_info *tx_info;
@@ -1503,8 +1454,8 @@ static void ath_tx_fill_desc(struct ath_softc *sc, struct ath_buf *bf,
 		if (nframes >= 2)
 			break;
 
-		bf = ath_tx_get_tid_subframe(sc, txq, tid);
-		if (!bf)
+		ret = ath_tx_get_tid_subframe(sc, txq, tid, &bf);
+		if (ret < 0)
 			break;
 
 		tx_info = IEEE80211_SKB_CB(bf->bf_mpdu);
@@ -1517,30 +1468,27 @@ static void ath_tx_fill_desc(struct ath_softc *sc, struct ath_buf *bf,
 	} while (1);
 }
 
-static bool ath_tx_sched_aggr(struct ath_softc *sc, struct ath_txq *txq,
-			      struct ath_atx_tid *tid)
+static int ath_tx_sched_aggr(struct ath_softc *sc, struct ath_txq *txq,
+			     struct ath_atx_tid *tid)
 {
-	struct ath_buf *bf;
+	struct ath_buf *bf = NULL;
 	struct ieee80211_tx_info *tx_info;
 	struct list_head bf_q;
-	int aggr_len = 0;
+	int aggr_len = 0, ret;
 	bool aggr;
 
-	if (!ath_tid_has_buffered(tid))
-		return false;
-
 	INIT_LIST_HEAD(&bf_q);
 
-	bf = ath_tx_get_tid_subframe(sc, txq, tid);
-	if (!bf)
-		return false;
+	ret = ath_tx_get_tid_subframe(sc, txq, tid, &bf);
+	if (ret < 0)
+		return ret;
 
 	tx_info = IEEE80211_SKB_CB(bf->bf_mpdu);
 	aggr = !!(tx_info->flags & IEEE80211_TX_CTL_AMPDU);
 	if ((aggr && txq->axq_ampdu_depth >= ATH_AGGR_MIN_QDEPTH) ||
 	    (!aggr && txq->axq_depth >= ATH_NON_AGGR_MIN_QDEPTH)) {
 		__skb_queue_tail(&tid->retry_q, bf->bf_mpdu);
-		return false;
+		return -EBUSY;
 	}
 
 	ath_set_rates(tid->an->vif, tid->an->sta, bf);
@@ -1550,7 +1498,7 @@ static bool ath_tx_sched_aggr(struct ath_softc *sc, struct ath_txq *txq,
 		ath_tx_form_burst(sc, txq, tid, &bf_q, bf);
 
 	if (list_empty(&bf_q))
-		return false;
+		return -EAGAIN;
 
 	if (tid->clear_ps_filter || tid->an->no_ps_filter) {
 		tid->clear_ps_filter = false;
@@ -1559,7 +1507,7 @@ static bool ath_tx_sched_aggr(struct ath_softc *sc, struct ath_txq *txq,
 
 	ath_tx_fill_desc(sc, bf, txq, aggr_len);
 	ath_tx_txqaddbuf(sc, txq, &bf_q, false);
-	return true;
+	return 0;
 }
 
 int ath_tx_aggr_start(struct ath_softc *sc, struct ieee80211_sta *sta,
@@ -1622,28 +1570,16 @@ void ath_tx_aggr_sleep(struct ieee80211_sta *sta, struct ath_softc *sc,
 {
 	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
 	struct ath_atx_tid *tid;
-	struct ath_txq *txq;
 	int tidno;
 
 	ath_dbg(common, XMIT, "%s called\n", __func__);
 
 	for (tidno = 0; tidno < IEEE80211_NUM_TIDS; tidno++) {
 		tid = ath_node_to_tid(an, tidno);
-		txq = tid->txq;
-
-		ath_txq_lock(sc, txq);
-
-		if (list_empty(&tid->list)) {
-			ath_txq_unlock(sc, txq);
-			continue;
-		}
 
 		if (!skb_queue_empty(&tid->retry_q))
 			ieee80211_sta_set_buffered(sta, tid->tidno, true);
 
-		list_del_init(&tid->list);
-
-		ath_txq_unlock(sc, txq);
 	}
 }
 
@@ -1662,11 +1598,12 @@ void ath_tx_aggr_wakeup(struct ath_softc *sc, struct ath_node *an)
 
 		ath_txq_lock(sc, txq);
 		tid->clear_ps_filter = true;
-		if (ath_tid_has_buffered(tid)) {
+		if (!skb_queue_empty(&tid->retry_q)) {
 			ath_tx_queue_tid(sc, tid);
 			ath_txq_schedule(sc, txq);
 		}
 		ath_txq_unlock_complete(sc, txq);
+
 	}
 }
 
@@ -1697,9 +1634,9 @@ void ath9k_release_buffered_frames(struct ieee80211_hw *hw,
 	struct ath_txq *txq = sc->tx.uapsdq;
 	struct ieee80211_tx_info *info;
 	struct list_head bf_q;
-	struct ath_buf *bf_tail = NULL, *bf;
+	struct ath_buf *bf_tail = NULL, *bf = NULL;
 	int sent = 0;
-	int i;
+	int i, ret;
 
 	INIT_LIST_HEAD(&bf_q);
 	for (i = 0; tids && nframes; i++, tids >>= 1) {
@@ -1712,8 +1649,9 @@ void ath9k_release_buffered_frames(struct ieee80211_hw *hw,
 
 		ath_txq_lock(sc, tid->txq);
 		while (nframes > 0) {
-			bf = ath_tx_get_tid_subframe(sc, sc->tx.uapsdq, tid);
-			if (!bf)
+			ret = ath_tx_get_tid_subframe(sc, sc->tx.uapsdq,
+						      tid, &bf);
+			if (ret < 0)
 				break;
 
 			ath9k_set_moredata(sc, bf, true);
@@ -1979,11 +1917,11 @@ void ath_tx_cleanupq(struct ath_softc *sc, struct ath_txq *txq)
  */
 void ath_txq_schedule(struct ath_softc *sc, struct ath_txq *txq)
 {
+	struct ieee80211_hw *hw = sc->hw;
 	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
+	struct ieee80211_txq *queue;
 	struct ath_atx_tid *tid;
-	struct list_head *tid_list;
-	struct ath_acq *acq;
-	bool active = AIRTIME_ACTIVE(sc->airtime_flags);
+	int ret;
 
 	if (txq->mac80211_qnum < 0)
 		return;
@@ -1991,58 +1929,26 @@ void ath_txq_schedule(struct ath_softc *sc, struct ath_txq *txq)
 	if (test_bit(ATH_OP_HW_RESET, &common->op_flags))
 		return;
 
+	ieee80211_txq_schedule_start(hw, txq->mac80211_qnum);
 	spin_lock_bh(&sc->chan_lock);
 	rcu_read_lock();
-	acq = &sc->cur_chan->acq[txq->mac80211_qnum];
 
 	if (sc->cur_chan->stopped)
 		goto out;
 
-begin:
-	tid_list = &acq->acq_new;
-	if (list_empty(tid_list)) {
-		tid_list = &acq->acq_old;
-		if (list_empty(tid_list))
-			goto out;
-	}
-	tid = list_first_entry(tid_list, struct ath_atx_tid, list);
-
-	if (active && tid->an->airtime_deficit[txq->mac80211_qnum] <= 0) {
-		spin_lock_bh(&acq->lock);
-		tid->an->airtime_deficit[txq->mac80211_qnum] += ATH_AIRTIME_QUANTUM;
-		list_move_tail(&tid->list, &acq->acq_old);
-		spin_unlock_bh(&acq->lock);
-		goto begin;
-	}
-
-	if (!ath_tid_has_buffered(tid)) {
-		spin_lock_bh(&acq->lock);
-		if ((tid_list == &acq->acq_new) && !list_empty(&acq->acq_old))
-			list_move_tail(&tid->list, &acq->acq_old);
-		else {
-			list_del_init(&tid->list);
-		}
-		spin_unlock_bh(&acq->lock);
-		goto begin;
-	}
+	while ((queue = ieee80211_next_txq(hw, txq->mac80211_qnum))) {
+		tid = (struct ath_atx_tid *)queue->drv_priv;
 
+		ret = ath_tx_sched_aggr(sc, txq, tid);
+		ath_dbg(common, QUEUE, "ath_tx_sched_aggr returned %d\n", ret);
 
-	/*
-	 * If we succeed in scheduling something, immediately restart to make
-	 * sure we keep the HW busy.
-	 */
-	if(ath_tx_sched_aggr(sc, txq, tid)) {
-		if (!active) {
-			spin_lock_bh(&acq->lock);
-			list_move_tail(&tid->list, &acq->acq_old);
-			spin_unlock_bh(&acq->lock);
-		}
-		goto begin;
+		ieee80211_return_txq(hw, queue);
 	}
 
 out:
 	rcu_read_unlock();
 	spin_unlock_bh(&sc->chan_lock);
+	ieee80211_txq_schedule_end(hw, txq->mac80211_qnum);
 }
 
 void ath_txq_schedule_all(struct ath_softc *sc)
@@ -2886,9 +2792,6 @@ void ath_tx_node_init(struct ath_softc *sc, struct ath_node *an)
 	struct ath_atx_tid *tid;
 	int tidno, acno;
 
-	for (acno = 0; acno < IEEE80211_NUM_ACS; acno++)
-		an->airtime_deficit[acno] = ATH_AIRTIME_QUANTUM;
-
 	for (tidno = 0; tidno < IEEE80211_NUM_TIDS; tidno++) {
 		tid = ath_node_to_tid(an, tidno);
 		tid->an        = an;
@@ -2898,7 +2801,6 @@ void ath_tx_node_init(struct ath_softc *sc, struct ath_node *an)
 		tid->baw_head  = tid->baw_tail = 0;
 		tid->active	   = false;
 		tid->clear_ps_filter = true;
-		tid->has_queued  = false;
 		__skb_queue_head_init(&tid->retry_q);
 		INIT_LIST_HEAD(&tid->list);
 		acno = TID_TO_WME_AC(tidno);
-- 
1.9.1

[PATCH v5 5/6] ath10k: migrate to mac80211 txq scheduling

[Rajkumar Manoharan]

From: Toke Høiland-Jørgensen <toke@toke.dk>

ath10k maintains common txqs list for all stations. This txq
management can be removed by migrating to mac80211 txq APIs
and let mac80211 handle txqs reordering based on reported airtime.
By doing this, txq fairness maintained in ath10k i.e processing
N frames per txq is removed. By adapting to mac80211 APIs,
ath10k will support mac80211 based airtime fairness algorithm.

Tested-by: Venkateswara Naralasetty <vnaralas@codeaurora.org>
Co-developed-by: Rajkumar Manoharan <rmanohar@codeaurora.org>
Signed-off-by: Toke Høiland-Jørgensen <toke@toke.dk>
Signed-off-by: Rajkumar Manoharan <rmanohar@codeaurora.org>
---
 drivers/net/wireless/ath/ath10k/core.c   |  2 -
 drivers/net/wireless/ath/ath10k/core.h   |  6 +-
 drivers/net/wireless/ath/ath10k/htc.h    |  1 -
 drivers/net/wireless/ath/ath10k/htt_rx.c |  8 +++
 drivers/net/wireless/ath/ath10k/mac.c    | 98 ++++++++++++++------------------
 5 files changed, 54 insertions(+), 61 deletions(-)

diff --git a/drivers/net/wireless/ath/ath10k/core.c b/drivers/net/wireless/ath/ath10k/core.c
index da607febfd82..c8dbbfa901af 100644
--- a/drivers/net/wireless/ath/ath10k/core.c
+++ b/drivers/net/wireless/ath/ath10k/core.c
@@ -3065,9 +3065,7 @@ struct ath10k *ath10k_core_create(size_t priv_size, struct device *dev,
 
 	mutex_init(&ar->conf_mutex);
 	spin_lock_init(&ar->data_lock);
-	spin_lock_init(&ar->txqs_lock);
 
-	INIT_LIST_HEAD(&ar->txqs);
 	INIT_LIST_HEAD(&ar->peers);
 	init_waitqueue_head(&ar->peer_mapping_wq);
 	init_waitqueue_head(&ar->htt.empty_tx_wq);
diff --git a/drivers/net/wireless/ath/ath10k/core.h b/drivers/net/wireless/ath/ath10k/core.h
index 042418097cf9..45afa813555c 100644
--- a/drivers/net/wireless/ath/ath10k/core.h
+++ b/drivers/net/wireless/ath/ath10k/core.h
@@ -90,6 +90,9 @@
 /* The magic used by QCA spec */
 #define ATH10K_SMBIOS_BDF_EXT_MAGIC "BDF_"
 
+/* Default Airtime weight multipler (Tuned for multiclient performance) */
+#define ATH10K_AIRTIME_WEIGHT_MULTIPLIER  4
+
 struct ath10k;
 
 static inline const char *ath10k_bus_str(enum ath10k_bus bus)
@@ -1062,10 +1065,7 @@ struct ath10k {
 
 	/* protects shared structure data */
 	spinlock_t data_lock;
-	/* protects: ar->txqs, artxq->list */
-	spinlock_t txqs_lock;
 
-	struct list_head txqs;
 	struct list_head arvifs;
 	struct list_head peers;
 	struct ath10k_peer *peer_map[ATH10K_MAX_NUM_PEER_IDS];
diff --git a/drivers/net/wireless/ath/ath10k/htc.h b/drivers/net/wireless/ath/ath10k/htc.h
index 51fda6c23f69..cb30add7dd33 100644
--- a/drivers/net/wireless/ath/ath10k/htc.h
+++ b/drivers/net/wireless/ath/ath10k/htc.h
@@ -51,7 +51,6 @@
  */
 
 #define HTC_HOST_MAX_MSG_PER_RX_BUNDLE        8
-#define HTC_HOST_MAX_MSG_PER_TX_BUNDLE        16
 
 enum ath10k_htc_tx_flags {
 	ATH10K_HTC_FLAG_NEED_CREDIT_UPDATE = 0x01,
diff --git a/drivers/net/wireless/ath/ath10k/htt_rx.c b/drivers/net/wireless/ath/ath10k/htt_rx.c
index ffec98f7be50..35738fc84271 100644
--- a/drivers/net/wireless/ath/ath10k/htt_rx.c
+++ b/drivers/net/wireless/ath/ath10k/htt_rx.c
@@ -2379,6 +2379,7 @@ static void ath10k_htt_rx_tx_fetch_ind(struct ath10k *ar, struct sk_buff *skb)
 	u8 tid;
 	int ret;
 	int i;
+	bool may_tx;
 
 	ath10k_dbg(ar, ATH10K_DBG_HTT, "htt rx tx fetch ind\n");
 
@@ -2451,8 +2452,13 @@ static void ath10k_htt_rx_tx_fetch_ind(struct ath10k *ar, struct sk_buff *skb)
 		num_msdus = 0;
 		num_bytes = 0;
 
+		ieee80211_txq_schedule_start(hw, txq->ac);
+		may_tx = ieee80211_txq_may_transmit(hw, txq);
 		while (num_msdus < max_num_msdus &&
 		       num_bytes < max_num_bytes) {
+			if (!may_tx)
+				break;
+
 			ret = ath10k_mac_tx_push_txq(hw, txq);
 			if (ret < 0)
 				break;
@@ -2460,6 +2466,8 @@ static void ath10k_htt_rx_tx_fetch_ind(struct ath10k *ar, struct sk_buff *skb)
 			num_msdus++;
 			num_bytes += ret;
 		}
+		ieee80211_return_txq(hw, txq);
+		ieee80211_txq_schedule_end(hw, txq->ac);
 
 		record->num_msdus = cpu_to_le16(num_msdus);
 		record->num_bytes = cpu_to_le32(num_bytes);
diff --git a/drivers/net/wireless/ath/ath10k/mac.c b/drivers/net/wireless/ath/ath10k/mac.c
index 7e49342bae38..f8a2a4b15982 100644
--- a/drivers/net/wireless/ath/ath10k/mac.c
+++ b/drivers/net/wireless/ath/ath10k/mac.c
@@ -3889,7 +3889,6 @@ static void ath10k_mac_txq_init(struct ieee80211_txq *txq)
 
 static void ath10k_mac_txq_unref(struct ath10k *ar, struct ieee80211_txq *txq)
 {
-	struct ath10k_txq *artxq;
 	struct ath10k_skb_cb *cb;
 	struct sk_buff *msdu;
 	int msdu_id;
@@ -3897,12 +3896,6 @@ static void ath10k_mac_txq_unref(struct ath10k *ar, struct ieee80211_txq *txq)
 	if (!txq)
 		return;
 
-	artxq = (void *)txq->drv_priv;
-	spin_lock_bh(&ar->txqs_lock);
-	if (!list_empty(&artxq->list))
-		list_del_init(&artxq->list);
-	spin_unlock_bh(&ar->txqs_lock);
-
 	spin_lock_bh(&ar->htt.tx_lock);
 	idr_for_each_entry(&ar->htt.pending_tx, msdu, msdu_id) {
 		cb = ATH10K_SKB_CB(msdu);
@@ -3942,7 +3935,6 @@ static bool ath10k_mac_tx_can_push(struct ieee80211_hw *hw,
 	struct ath10k_txq *artxq = (void *)txq->drv_priv;
 
 	/* No need to get locks */
-
 	if (ar->htt.tx_q_state.mode == HTT_TX_MODE_SWITCH_PUSH)
 		return true;
 
@@ -4029,48 +4021,45 @@ int ath10k_mac_tx_push_txq(struct ieee80211_hw *hw,
 	return skb_len;
 }
 
-void ath10k_mac_tx_push_pending(struct ath10k *ar)
+static int ath10k_mac_schedule_txq(struct ieee80211_hw *hw, u32 ac)
 {
-	struct ieee80211_hw *hw = ar->hw;
 	struct ieee80211_txq *txq;
-	struct ath10k_txq *artxq;
-	struct ath10k_txq *last;
-	int ret;
-	int max;
-
-	if (ar->htt.num_pending_tx >= (ar->htt.max_num_pending_tx / 2))
-		return;
-
-	spin_lock_bh(&ar->txqs_lock);
-	rcu_read_lock();
-
-	last = list_last_entry(&ar->txqs, struct ath10k_txq, list);
-	while (!list_empty(&ar->txqs)) {
-		artxq = list_first_entry(&ar->txqs, struct ath10k_txq, list);
-		txq = container_of((void *)artxq, struct ieee80211_txq,
-				   drv_priv);
+	int ret = 0;
 
-		/* Prevent aggressive sta/tid taking over tx queue */
-		max = HTC_HOST_MAX_MSG_PER_TX_BUNDLE;
-		ret = 0;
-		while (ath10k_mac_tx_can_push(hw, txq) && max--) {
+	ieee80211_txq_schedule_start(hw, ac);
+	while ((txq = ieee80211_next_txq(hw, ac))) {
+		while (ath10k_mac_tx_can_push(hw, txq)) {
 			ret = ath10k_mac_tx_push_txq(hw, txq);
 			if (ret < 0)
 				break;
 		}
+		ieee80211_return_txq(hw, txq);
+		ath10k_htt_tx_txq_update(hw, txq);
+		if (ret == -EBUSY)
+			break;
+	}
+	ieee80211_txq_schedule_end(hw, ac);
+
+	return ret;
+}
 
-		list_del_init(&artxq->list);
-		if (ret != -ENOENT)
-			list_add_tail(&artxq->list, &ar->txqs);
+void ath10k_mac_tx_push_pending(struct ath10k *ar)
+{
+	struct ieee80211_hw *hw = ar->hw;
+	u32 ac;
 
-		ath10k_htt_tx_txq_update(hw, txq);
+	if (ar->htt.tx_q_state.mode != HTT_TX_MODE_SWITCH_PUSH)
+		return;
 
-		if (artxq == last || (ret < 0 && ret != -ENOENT))
+	if (ar->htt.num_pending_tx >= (ar->htt.max_num_pending_tx / 2))
+		return;
+
+	rcu_read_lock();
+	for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
+		if (ath10k_mac_schedule_txq(hw, ac) == -EBUSY)
 			break;
 	}
-
 	rcu_read_unlock();
-	spin_unlock_bh(&ar->txqs_lock);
 }
 EXPORT_SYMBOL(ath10k_mac_tx_push_pending);
 
@@ -4309,31 +4298,28 @@ static void ath10k_mac_op_wake_tx_queue(struct ieee80211_hw *hw,
 					struct ieee80211_txq *txq)
 {
 	struct ath10k *ar = hw->priv;
-	struct ath10k_txq *artxq = (void *)txq->drv_priv;
-	struct ieee80211_txq *f_txq;
-	struct ath10k_txq *f_artxq;
-	int ret = 0;
-	int max = HTC_HOST_MAX_MSG_PER_TX_BUNDLE;
+	int ret;
+	u8 ac;
 
-	spin_lock_bh(&ar->txqs_lock);
-	if (list_empty(&artxq->list))
-		list_add_tail(&artxq->list, &ar->txqs);
+	ath10k_htt_tx_txq_update(hw, txq);
+	if (ar->htt.tx_q_state.mode != HTT_TX_MODE_SWITCH_PUSH)
+		return;
 
-	f_artxq = list_first_entry(&ar->txqs, struct ath10k_txq, list);
-	f_txq = container_of((void *)f_artxq, struct ieee80211_txq, drv_priv);
-	list_del_init(&f_artxq->list);
+	ac = txq->ac;
+	ieee80211_txq_schedule_start(hw, ac);
+	txq = ieee80211_next_txq(hw, ac);
+	if (!txq)
+		goto out;
 
-	while (ath10k_mac_tx_can_push(hw, f_txq) && max--) {
-		ret = ath10k_mac_tx_push_txq(hw, f_txq);
+	while (ath10k_mac_tx_can_push(hw, txq)) {
+		ret = ath10k_mac_tx_push_txq(hw, txq);
 		if (ret < 0)
 			break;
 	}
-	if (ret != -ENOENT)
-		list_add_tail(&f_artxq->list, &ar->txqs);
-	spin_unlock_bh(&ar->txqs_lock);
-
-	ath10k_htt_tx_txq_update(hw, f_txq);
+	ieee80211_return_txq(hw, txq);
 	ath10k_htt_tx_txq_update(hw, txq);
+out:
+	ieee80211_txq_schedule_end(hw, ac);
 }
 
 /* Must not be called with conf_mutex held as workers can use that also. */
@@ -8687,6 +8673,8 @@ int ath10k_mac_register(struct ath10k *ar)
 
 	wiphy_ext_feature_set(ar->hw->wiphy, NL80211_EXT_FEATURE_CQM_RSSI_LIST);
 
+	ar->hw->weight_multiplier = ATH10K_AIRTIME_WEIGHT_MULTIPLIER;
+
 	ret = ieee80211_register_hw(ar->hw);
 	if (ret) {
 		ath10k_err(ar, "failed to register ieee80211: %d\n", ret);
-- 
1.9.1

[PATCH v5 6/6] ath10k: reporting estimated tx airtime for fairness

[Rajkumar Manoharan]

From: Kan Yan <kyan@google.com>

Transmit airtime will be estimated from last tx rate used.
Firmware report tx rate by peer stats. Airtime is computed
on tx path and the same will be reported to mac80211 upon
tx completion.

This change is based on Kan's orginal commit in Chromium tree
("CHROMIUM: ath10k: Implementing airtime fairness based TX scheduler")
ref: https://chromium-review.googlesource.com/588190

Signed-off-by: Kan Yan <kyan@google.com>
[rmanohar@codeaurora.org: ported only the airtime computation]
Signed-off-by: Rajkumar Manoharan <rmanohar@codeaurora.org>
---
 drivers/net/wireless/ath/ath10k/core.h   |  2 ++
 drivers/net/wireless/ath/ath10k/htt_rx.c |  1 +
 drivers/net/wireless/ath/ath10k/mac.c    | 57 ++++++++++++++++++++++++++++++--
 drivers/net/wireless/ath/ath10k/txrx.c   |  4 +++
 4 files changed, 61 insertions(+), 3 deletions(-)

diff --git a/drivers/net/wireless/ath/ath10k/core.h b/drivers/net/wireless/ath/ath10k/core.h
index 45afa813555c..883bf4613ab3 100644
--- a/drivers/net/wireless/ath/ath10k/core.h
+++ b/drivers/net/wireless/ath/ath10k/core.h
@@ -126,6 +126,7 @@ struct ath10k_skb_cb {
 	u8 flags;
 	u8 eid;
 	u16 msdu_id;
+	u16 airtime_est;
 	struct ieee80211_vif *vif;
 	struct ieee80211_txq *txq;
 } __packed;
@@ -496,6 +497,7 @@ struct ath10k_sta {
 	u32 smps;
 	u16 peer_id;
 	struct rate_info txrate;
+	u32 last_tx_bitrate;
 
 	struct work_struct update_wk;
 	u64 rx_duration;
diff --git a/drivers/net/wireless/ath/ath10k/htt_rx.c b/drivers/net/wireless/ath/ath10k/htt_rx.c
index 35738fc84271..26134bed52d2 100644
--- a/drivers/net/wireless/ath/ath10k/htt_rx.c
+++ b/drivers/net/wireless/ath/ath10k/htt_rx.c
@@ -2808,6 +2808,7 @@ static inline int ath10k_get_legacy_rate_idx(struct ath10k *ar, u8 rate)
 
 	arsta->txrate.nss = txrate.nss;
 	arsta->txrate.bw = ath10k_bw_to_mac80211_bw(txrate.bw);
+	arsta->last_tx_bitrate = cfg80211_calculate_bitrate(&arsta->txrate);
 
 	if (ath10k_debug_is_extd_tx_stats_enabled(ar))
 		ath10k_accumulate_per_peer_tx_stats(ar, arsta, peer_stats,
diff --git a/drivers/net/wireless/ath/ath10k/mac.c b/drivers/net/wireless/ath/ath10k/mac.c
index f8a2a4b15982..622a03a13a9b 100644
--- a/drivers/net/wireless/ath/ath10k/mac.c
+++ b/drivers/net/wireless/ath/ath10k/mac.c
@@ -3543,7 +3543,7 @@ static void ath10k_tx_h_add_p2p_noa_ie(struct ath10k *ar,
 static void ath10k_mac_tx_h_fill_cb(struct ath10k *ar,
 				    struct ieee80211_vif *vif,
 				    struct ieee80211_txq *txq,
-				    struct sk_buff *skb)
+				    struct sk_buff *skb, u16 airtime)
 {
 	struct ieee80211_hdr *hdr = (void *)skb->data;
 	struct ath10k_skb_cb *cb = ATH10K_SKB_CB(skb);
@@ -3560,6 +3560,7 @@ static void ath10k_mac_tx_h_fill_cb(struct ath10k *ar,
 
 	cb->vif = vif;
 	cb->txq = txq;
+	cb->airtime_est = airtime;
 }
 
 bool ath10k_mac_tx_frm_has_freq(struct ath10k *ar)
@@ -3947,6 +3948,49 @@ static bool ath10k_mac_tx_can_push(struct ieee80211_hw *hw,
 	return false;
 }
 
+/* Return estimated airtime in microsecond, which is calculated using last
+ * reported TX rate. This is just a rough estimation because host driver has no
+ * knowledge of the actual transmit rate, retries or aggregation. If actual
+ * airtime can be reported by firmware, then delta between estimated and actual
+ * airtime can be adjusted from deficit.
+ */
+#define IEEE80211_ATF_OVERHEAD		100	/* IFS + some slot time */
+#define IEEE80211_ATF_OVERHEAD_IFS	16	/* IFS only */
+static u16 ath10k_mac_update_airtime(struct ath10k *ar,
+				     struct ieee80211_txq *txq,
+				     struct sk_buff *skb)
+{
+	struct ath10k_sta *arsta;
+	u32 pktlen;
+	u16 airtime = 0;
+
+	if (!txq || !txq->sta)
+		return airtime;
+
+	spin_lock_bh(&ar->data_lock);
+	arsta = (struct ath10k_sta *)txq->sta->drv_priv;
+
+	pktlen = skb->len + 38; /* Assume MAC header 30, SNAP 8 for most case */
+	if (arsta->last_tx_bitrate) {
+		/* airtime in us, last_tx_bitrate in 100kbps */
+		airtime = (pktlen * 8 * (1000 / 100))
+				/ arsta->last_tx_bitrate;
+		/* overhead for media access time and IFS */
+		airtime += IEEE80211_ATF_OVERHEAD_IFS;
+	} else {
+		/* This is mostly for throttle excessive BC/MC frames, and the
+		 * airtime/rate doesn't need be exact. Airtime of BC/MC frames
+		 * in 2G get some discount, which helps prevent very low rate
+		 * frames from being blocked for too long.
+		 */
+		airtime = (pktlen * 8 * (1000 / 100)) / 60; /* 6M */
+		airtime += IEEE80211_ATF_OVERHEAD;
+	}
+	spin_unlock_bh(&ar->data_lock);
+
+	return airtime;
+}
+
 int ath10k_mac_tx_push_txq(struct ieee80211_hw *hw,
 			   struct ieee80211_txq *txq)
 {
@@ -3962,6 +4006,7 @@ int ath10k_mac_tx_push_txq(struct ieee80211_hw *hw,
 	size_t skb_len;
 	bool is_mgmt, is_presp;
 	int ret;
+	u16 airtime;
 
 	spin_lock_bh(&ar->htt.tx_lock);
 	ret = ath10k_htt_tx_inc_pending(htt);
@@ -3979,7 +4024,8 @@ int ath10k_mac_tx_push_txq(struct ieee80211_hw *hw,
 		return -ENOENT;
 	}
 
-	ath10k_mac_tx_h_fill_cb(ar, vif, txq, skb);
+	airtime = ath10k_mac_update_airtime(ar, txq, skb);
+	ath10k_mac_tx_h_fill_cb(ar, vif, txq, skb, airtime);
 
 	skb_len = skb->len;
 	txmode = ath10k_mac_tx_h_get_txmode(ar, vif, sta, skb);
@@ -4246,8 +4292,10 @@ static void ath10k_mac_op_tx(struct ieee80211_hw *hw,
 	bool is_mgmt;
 	bool is_presp;
 	int ret;
+	u16 airtime;
 
-	ath10k_mac_tx_h_fill_cb(ar, vif, txq, skb);
+	airtime = ath10k_mac_update_airtime(ar, txq, skb);
+	ath10k_mac_tx_h_fill_cb(ar, vif, txq, skb, airtime);
 
 	txmode = ath10k_mac_tx_h_get_txmode(ar, vif, sta, skb);
 	txpath = ath10k_mac_tx_h_get_txpath(ar, skb, txmode);
@@ -8564,6 +8612,9 @@ int ath10k_mac_register(struct ath10k *ar)
 		wiphy_ext_feature_set(ar->hw->wiphy,
 				      NL80211_EXT_FEATURE_ACK_SIGNAL_SUPPORT);
 
+	if (ath10k_peer_stats_enabled(ar))
+		wiphy_ext_feature_set(ar->hw->wiphy,
+				      NL80211_EXT_FEATURE_AIRTIME_FAIRNESS);
 	/*
 	 * on LL hardware queues are managed entirely by the FW
 	 * so we only advertise to mac we can do the queues thing
diff --git a/drivers/net/wireless/ath/ath10k/txrx.c b/drivers/net/wireless/ath/ath10k/txrx.c
index 23606b6972d0..8e7c416cd330 100644
--- a/drivers/net/wireless/ath/ath10k/txrx.c
+++ b/drivers/net/wireless/ath/ath10k/txrx.c
@@ -95,6 +95,10 @@ int ath10k_txrx_tx_unref(struct ath10k_htt *htt,
 		wake_up(&htt->empty_tx_wq);
 	spin_unlock_bh(&htt->tx_lock);
 
+	if (txq && txq->sta)
+		ieee80211_sta_register_airtime(txq->sta, txq->tid,
+					       skb_cb->airtime_est, 0);
+
 	if (ar->dev_type != ATH10K_DEV_TYPE_HL)
 		dma_unmap_single(dev, skb_cb->paddr, msdu->len, DMA_TO_DEVICE);
 
-- 
1.9.1

Re: [PATCH v5 0/6] Move TXQ scheduling and airtime fairness into mac80211

[Toke Høiland-Jørgensen]

Rajkumar Manoharan <rmanohar@codeaurora.org> writes:

> All,
>
> Sorry for the long delay. Here is the consolidated series of mac80211,
> ath9k and ath10k changes for moving TXQ scheduling and airtime fairness
> into mac80211 and support airtime fairness.

Thanks for taking care of the respin!

Johannes, I think it's safe for you to review this version. I have
started working on another approach for the scheduler algorithm itself,
but it is fine to do as an incremental patch on top of this as it
shouldn't impact the API. Having a separate patch also makes testing
easier anyway. I'll see if I can't get it to a working state over the
holidays...

-Toke

Re: [PATCH v5 5/6] ath10k: migrate to mac80211 txq scheduling

[Kalle Valo]

Rajkumar Manoharan <rmanohar@codeaurora.org> writes:

> From: Toke Høiland-Jørgensen <toke@toke.dk>
>
> ath10k maintains common txqs list for all stations. This txq
> management can be removed by migrating to mac80211 txq APIs
> and let mac80211 handle txqs reordering based on reported airtime.
> By doing this, txq fairness maintained in ath10k i.e processing
> N frames per txq is removed. By adapting to mac80211 APIs,
> ath10k will support mac80211 based airtime fairness algorithm.
>
> Tested-by: Venkateswara Naralasetty <vnaralas@codeaurora.org>
> Co-developed-by: Rajkumar Manoharan <rmanohar@codeaurora.org>
> Signed-off-by: Toke Høiland-Jørgensen <toke@toke.dk>
> Signed-off-by: Rajkumar Manoharan <rmanohar@codeaurora.org>

Please always add hardware and firmware versions used for testing. But I
can add that, so no need to resend because of this. Just let me know
what to add.

-- 
Kalle Valo

Re: [PATCH v5 6/6] ath10k: reporting estimated tx airtime for fairness

[Kalle Valo]

Rajkumar Manoharan <rmanohar@codeaurora.org> writes:

> From: Kan Yan <kyan@google.com>
>
> Transmit airtime will be estimated from last tx rate used.
> Firmware report tx rate by peer stats. Airtime is computed
> on tx path and the same will be reported to mac80211 upon
> tx completion.
>
> This change is based on Kan's orginal commit in Chromium tree
> ("CHROMIUM: ath10k: Implementing airtime fairness based TX scheduler")
> ref: https://chromium-review.googlesource.com/588190
>
> Signed-off-by: Kan Yan <kyan@google.com>
> [rmanohar@codeaurora.org: ported only the airtime computation]
> Signed-off-by: Rajkumar Manoharan <rmanohar@codeaurora.org>

Same as with patch 5, let me know the tested hardware and firmware so I
can add it to the commit log.

-- 
Kalle Valo

Re: [Make-wifi-fast] [PATCH v5 0/6] Move TXQ scheduling and airtime fairness into mac80211

[Dave Taht]

Toke Høiland-Jørgensen <toke@toke.dk> writes:

> Rajkumar Manoharan <rmanohar@codeaurora.org> writes:
>
>> All,
>>
>> Sorry for the long delay. Here is the consolidated series of mac80211,
>> ath9k and ath10k changes for moving TXQ scheduling and airtime fairness
>> into mac80211 and support airtime fairness.
>
> Thanks for taking care of the respin!
>
> Johannes, I think it's safe for you to review this version. I have
> started working on another approach for the scheduler algorithm itself,
> but it is fine to do as an incremental patch on top of this as it
> shouldn't impact the API. Having a separate patch also makes testing
> easier anyway. I'll see if I can't get it to a working state over the
> holidays...

There comes a time in all patch series where the best thing to do is
commit it, and inflict it on others. Now may be that time.

Acked-by: Dave Taht <dave.taht@gmail.com>

>
> -Toke
> _______________________________________________
> Make-wifi-fast mailing list
> Make-wifi-fast@lists.bufferbloat.net
> https://lists.bufferbloat.net/listinfo/make-wifi-fast

Re: [PATCH v5 3/6] mac80211: Add airtime accounting and scheduling to TXQs

[kbuild test robot]

[-- Attachment #1: Type: text/plain, Size: 55086 bytes --]

Hi Toke,

I love your patch! Perhaps something to improve:

[auto build test WARNING on mac80211/master]
[also build test WARNING on v4.20-rc7]
[cannot apply to next-20181219]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Rajkumar-Manoharan/Move-TXQ-scheduling-and-airtime-fairness-into-mac80211/20181219-132034
base:   https://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211.git master
reproduce: make htmldocs

All warnings (new ones prefixed by >>):

   include/net/cfg80211.h:4447: warning: Function parameter or member 'wext.prev_bssid_valid' not described in 'wireless_dev'
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/cfg80211.h:2846: warning: cannot understand function prototype: 'struct cfg80211_ftm_responder_stats '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:2400: warning: Function parameter or member 'radiotap_timestamp.units_pos' not described in 'ieee80211_hw'
   include/net/mac80211.h:2400: warning: Function parameter or member 'radiotap_timestamp.accuracy' not described in 'ieee80211_hw'
>> include/net/mac80211.h:2400: warning: Function parameter or member 'weight_multiplier' not described in 'ieee80211_hw'
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:1007: warning: Function parameter or member 'control.rates' not described in 'ieee80211_tx_info'
   include/net/mac80211.h:1007: warning: Function parameter or member 'control.rts_cts_rate_idx' not described in 'ieee80211_tx_info'
   include/net/mac80211.h:1007: warning: Function parameter or member 'control.use_rts' not described in 'ieee80211_tx_info'
   include/net/mac80211.h:1007: warning: Function parameter or member 'control.use_cts_prot' not described in 'ieee80211_tx_info'
   include/net/mac80211.h:1007: warning: Function parameter or member 'control.short_preamble' not described in 'ieee80211_tx_info'
   include/net/mac80211.h:1007: warning: Function parameter or member 'control.skip_table' not described in 'ieee80211_tx_info'
   include/net/mac80211.h:1007: warning: Function parameter or member 'control.jiffies' not described in 'ieee80211_tx_info'
   include/net/mac80211.h:1007: warning: Function parameter or member 'control.vif' not described in 'ieee80211_tx_info'
   include/net/mac80211.h:1007: warning: Function parameter or member 'control.hw_key' not described in 'ieee80211_tx_info'
   include/net/mac80211.h:1007: warning: Function parameter or member 'control.flags' not described in 'ieee80211_tx_info'
   include/net/mac80211.h:1007: warning: Function parameter or member 'control.enqueue_time' not described in 'ieee80211_tx_info'
   include/net/mac80211.h:1007: warning: Function parameter or member 'ack' not described in 'ieee80211_tx_info'
   include/net/mac80211.h:1007: warning: Function parameter or member 'ack.cookie' not described in 'ieee80211_tx_info'
   include/net/mac80211.h:1007: warning: Function parameter or member 'status.rates' not described in 'ieee80211_tx_info'
   include/net/mac80211.h:1007: warning: Function parameter or member 'status.ack_signal' not described in 'ieee80211_tx_info'
   include/net/mac80211.h:1007: warning: Function parameter or member 'status.ampdu_ack_len' not described in 'ieee80211_tx_info'
   include/net/mac80211.h:1007: warning: Function parameter or member 'status.ampdu_len' not described in 'ieee80211_tx_info'
   include/net/mac80211.h:1007: warning: Function parameter or member 'status.antenna' not described in 'ieee80211_tx_info'
   include/net/mac80211.h:1007: warning: Function parameter or member 'status.tx_time' not described in 'ieee80211_tx_info'
   include/net/mac80211.h:1007: warning: Function parameter or member 'status.is_valid_ack_signal' not described in 'ieee80211_tx_info'
   include/net/mac80211.h:1007: warning: Function parameter or member 'status.status_driver_data' not described in 'ieee80211_tx_info'
   include/net/mac80211.h:1007: warning: Function parameter or member 'driver_rates' not described in 'ieee80211_tx_info'
   include/net/mac80211.h:1007: warning: Function parameter or member 'pad' not described in 'ieee80211_tx_info'
   include/net/mac80211.h:1007: warning: Function parameter or member 'rate_driver_data' not described in 'ieee80211_tx_info'
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   include/net/mac80211.h:483: warning: cannot understand function prototype: 'struct ieee80211_ftm_responder_params '
   net/mac80211/sta_info.h:601: warning: Function parameter or member 'rx_stats_avg' not described in 'sta_info'
   net/mac80211/sta_info.h:601: warning: Function parameter or member 'rx_stats_avg.signal' not described in 'sta_info'
   net/mac80211/sta_info.h:601: warning: Function parameter or member 'rx_stats_avg.chain_signal' not described in 'sta_info'
   net/mac80211/sta_info.h:601: warning: Function parameter or member 'status_stats.filtered' not described in 'sta_info'
   net/mac80211/sta_info.h:601: warning: Function parameter or member 'status_stats.retry_failed' not described in 'sta_info'
   net/mac80211/sta_info.h:601: warning: Function parameter or member 'status_stats.retry_count' not described in 'sta_info'
   net/mac80211/sta_info.h:601: warning: Function parameter or member 'status_stats.lost_packets' not described in 'sta_info'
   net/mac80211/sta_info.h:601: warning: Function parameter or member 'status_stats.last_tdls_pkt_time' not described in 'sta_info'
   net/mac80211/sta_info.h:601: warning: Function parameter or member 'status_stats.msdu_retries' not described in 'sta_info'
   net/mac80211/sta_info.h:601: warning: Function parameter or member 'status_stats.msdu_failed' not described in 'sta_info'
   net/mac80211/sta_info.h:601: warning: Function parameter or member 'status_stats.last_ack' not described in 'sta_info'
   net/mac80211/sta_info.h:601: warning: Function parameter or member 'status_stats.last_ack_signal' not described in 'sta_info'
   net/mac80211/sta_info.h:601: warning: Function parameter or member 'status_stats.ack_signal_filled' not described in 'sta_info'
   net/mac80211/sta_info.h:601: warning: Function parameter or member 'status_stats.avg_ack_signal' not described in 'sta_info'
   net/mac80211/sta_info.h:601: warning: Function parameter or member 'tx_stats.packets' not described in 'sta_info'
   net/mac80211/sta_info.h:601: warning: Function parameter or member 'tx_stats.bytes' not described in 'sta_info'
   net/mac80211/sta_info.h:601: warning: Function parameter or member 'tx_stats.last_rate' not described in 'sta_info'
   net/mac80211/sta_info.h:601: warning: Function parameter or member 'tx_stats.msdu' not described in 'sta_info'
>> net/mac80211/sta_info.h:601: warning: Function parameter or member 'airtime' not described in 'sta_info'
>> net/mac80211/sta_info.h:601: warning: Function parameter or member 'airtime_weight' not described in 'sta_info'
   kernel/rcu/tree.c:685: warning: Excess function parameter 'irq' description in 'rcu_nmi_exit'
   include/linux/dma-buf.h:304: warning: Function parameter or member 'cb_excl.cb' not described in 'dma_buf'
   include/linux/dma-buf.h:304: warning: Function parameter or member 'cb_excl.poll' not described in 'dma_buf'
   include/linux/dma-buf.h:304: warning: Function parameter or member 'cb_excl.active' not described in 'dma_buf'
   include/linux/dma-buf.h:304: warning: Function parameter or member 'cb_shared.cb' not described in 'dma_buf'
   include/linux/dma-buf.h:304: warning: Function parameter or member 'cb_shared.poll' not described in 'dma_buf'
   include/linux/dma-buf.h:304: warning: Function parameter or member 'cb_shared.active' not described in 'dma_buf'
   include/linux/dma-fence-array.h:54: warning: Function parameter or member 'work' not described in 'dma_fence_array'
   include/linux/gpio/driver.h:375: warning: Function parameter or member 'init_valid_mask' not described in 'gpio_chip'
   include/linux/iio/hw-consumer.h:1: warning: no structured comments found
   include/linux/input/sparse-keymap.h:46: warning: Function parameter or member 'sw' not described in 'key_entry'
   include/linux/regulator/driver.h:227: warning: Function parameter or member 'resume' not described in 'regulator_ops'
   arch/s390/include/asm/cio.h:245: warning: Function parameter or member 'esw.esw0' not described in 'irb'
   arch/s390/include/asm/cio.h:245: warning: Function parameter or member 'esw.esw1' not described in 'irb'
   arch/s390/include/asm/cio.h:245: warning: Function parameter or member 'esw.esw2' not described in 'irb'
   arch/s390/include/asm/cio.h:245: warning: Function parameter or member 'esw.esw3' not described in 'irb'
   arch/s390/include/asm/cio.h:245: warning: Function parameter or member 'esw.eadm' not described in 'irb'
   drivers/slimbus/stream.c:1: warning: no structured comments found
   include/linux/spi/spi.h:177: warning: Function parameter or member 'driver_override' not described in 'spi_device'
   drivers/target/target_core_device.c:1: warning: no structured comments found
   drivers/usb/typec/bus.c:1: warning: no structured comments found
   drivers/usb/typec/class.c:1: warning: no structured comments found
   include/linux/w1.h:281: warning: Function parameter or member 'of_match_table' not described in 'w1_family'
   fs/direct-io.c:257: warning: Excess function parameter 'offset' description in 'dio_complete'
   fs/file_table.c:1: warning: no structured comments found
   fs/libfs.c:477: warning: Excess function parameter 'available' description in 'simple_write_end'
   fs/posix_acl.c:646: warning: Function parameter or member 'inode' not described in 'posix_acl_update_mode'
   fs/posix_acl.c:646: warning: Function parameter or member 'mode_p' not described in 'posix_acl_update_mode'
   fs/posix_acl.c:646: warning: Function parameter or member 'acl' not described in 'posix_acl_update_mode'
   drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c:183: warning: Function parameter or member 'blockable' not described in 'amdgpu_mn_read_lock'
   drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c:254: warning: Function parameter or member 'blockable' not described in 'amdgpu_mn_invalidate_range_start_gfx'
   drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c:302: warning: Function parameter or member 'blockable' not described in 'amdgpu_mn_invalidate_range_start_hsa'
   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:382: warning: cannot understand function prototype: 'struct amdgpu_vm_pt_cursor '
   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:383: warning: cannot understand function prototype: 'struct amdgpu_vm_pt_cursor '
   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:555: warning: Function parameter or member 'adev' not described in 'for_each_amdgpu_vm_pt_leaf'
   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:555: warning: Function parameter or member 'vm' not described in 'for_each_amdgpu_vm_pt_leaf'
   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:555: warning: Function parameter or member 'start' not described in 'for_each_amdgpu_vm_pt_leaf'
   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:555: warning: Function parameter or member 'end' not described in 'for_each_amdgpu_vm_pt_leaf'
   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:555: warning: Function parameter or member 'cursor' not described in 'for_each_amdgpu_vm_pt_leaf'
   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:603: warning: Function parameter or member 'adev' not described in 'for_each_amdgpu_vm_pt_dfs_safe'
   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:603: warning: Function parameter or member 'vm' not described in 'for_each_amdgpu_vm_pt_dfs_safe'
   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:603: warning: Function parameter or member 'cursor' not described in 'for_each_amdgpu_vm_pt_dfs_safe'
   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:603: warning: Function parameter or member 'entry' not described in 'for_each_amdgpu_vm_pt_dfs_safe'
   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:848: warning: Function parameter or member 'level' not described in 'amdgpu_vm_bo_param'
   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:1356: warning: Function parameter or member 'params' not described in 'amdgpu_vm_update_func'
   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:1356: warning: Function parameter or member 'bo' not described in 'amdgpu_vm_update_func'
   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:1356: warning: Function parameter or member 'pe' not described in 'amdgpu_vm_update_func'
   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:1356: warning: Function parameter or member 'addr' not described in 'amdgpu_vm_update_func'
   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:1356: warning: Function parameter or member 'count' not described in 'amdgpu_vm_update_func'
   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:1356: warning: Function parameter or member 'incr' not described in 'amdgpu_vm_update_func'
   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:1356: warning: Function parameter or member 'flags' not described in 'amdgpu_vm_update_func'
   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:1523: warning: Function parameter or member 'params' not described in 'amdgpu_vm_update_huge'
   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:1523: warning: Function parameter or member 'bo' not described in 'amdgpu_vm_update_huge'
   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:1523: warning: Function parameter or member 'level' not described in 'amdgpu_vm_update_huge'
   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:1523: warning: Function parameter or member 'pe' not described in 'amdgpu_vm_update_huge'
   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:1523: warning: Function parameter or member 'addr' not described in 'amdgpu_vm_update_huge'
   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:1523: warning: Function parameter or member 'count' not described in 'amdgpu_vm_update_huge'
   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:1523: warning: Function parameter or member 'incr' not described in 'amdgpu_vm_update_huge'
   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:1523: warning: Function parameter or member 'flags' not described in 'amdgpu_vm_update_huge'
   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:3100: warning: Function parameter or member 'pasid' not described in 'amdgpu_vm_make_compute'
   include/drm/drm_drv.h:609: warning: Function parameter or member 'gem_prime_pin' not described in 'drm_driver'
   include/drm/drm_drv.h:609: warning: Function parameter or member 'gem_prime_unpin' not described in 'drm_driver'
   include/drm/drm_drv.h:609: warning: Function parameter or member 'gem_prime_res_obj' not described in 'drm_driver'
   include/drm/drm_drv.h:609: warning: Function parameter or member 'gem_prime_get_sg_table' not described in 'drm_driver'
   include/drm/drm_drv.h:609: warning: Function parameter or member 'gem_prime_import_sg_table' not described in 'drm_driver'
   include/drm/drm_drv.h:609: warning: Function parameter or member 'gem_prime_vmap' not described in 'drm_driver'
   include/drm/drm_drv.h:609: warning: Function parameter or member 'gem_prime_vunmap' not described in 'drm_driver'
   include/drm/drm_drv.h:609: warning: Function parameter or member 'gem_prime_mmap' not described in 'drm_driver'
   include/drm/drm_mode_config.h:869: warning: Function parameter or member 'quirk_addfb_prefer_xbgr_30bpp' not described in 'drm_mode_config'
   drivers/gpu/drm/i915/i915_vma.h:49: warning: cannot understand function prototype: 'struct i915_vma '
   drivers/gpu/drm/i915/i915_vma.h:1: warning: no structured comments found
   drivers/gpu/drm/i915/intel_guc_fwif.h:554: warning: cannot understand function prototype: 'struct guc_log_buffer_state '
   drivers/gpu/drm/i915/i915_trace.h:1: warning: no structured comments found
   include/linux/skbuff.h:862: warning: Function parameter or member 'dev_scratch' not described in 'sk_buff'
   include/linux/skbuff.h:862: warning: Function parameter or member 'list' not described in 'sk_buff'
   include/linux/skbuff.h:862: warning: Function parameter or member 'ip_defrag_offset' not described in 'sk_buff'
   include/linux/skbuff.h:862: warning: Function parameter or member 'skb_mstamp_ns' not described in 'sk_buff'
   include/linux/skbuff.h:862: warning: Function parameter or member '__cloned_offset' not described in 'sk_buff'
   include/linux/skbuff.h:862: warning: Function parameter or member 'head_frag' not described in 'sk_buff'
   include/linux/skbuff.h:862: warning: Function parameter or member '__pkt_type_offset' not described in 'sk_buff'
   include/linux/skbuff.h:862: warning: Function parameter or member 'encapsulation' not described in 'sk_buff'
   include/linux/skbuff.h:862: warning: Function parameter or member 'encap_hdr_csum' not described in 'sk_buff'
   include/linux/skbuff.h:862: warning: Function parameter or member 'csum_valid' not described in 'sk_buff'
   include/linux/skbuff.h:862: warning: Function parameter or member 'csum_complete_sw' not described in 'sk_buff'
   include/linux/skbuff.h:862: warning: Function parameter or member 'csum_level' not described in 'sk_buff'
   include/linux/skbuff.h:862: warning: Function parameter or member 'inner_protocol_type' not described in 'sk_buff'
   include/linux/skbuff.h:862: warning: Function parameter or member 'remcsum_offload' not described in 'sk_buff'
   include/linux/skbuff.h:862: warning: Function parameter or member 'offload_fwd_mark' not described in 'sk_buff'
   include/linux/skbuff.h:862: warning: Function parameter or member 'offload_mr_fwd_mark' not described in 'sk_buff'
   include/linux/skbuff.h:862: warning: Function parameter or member 'sender_cpu' not described in 'sk_buff'
   include/linux/skbuff.h:862: warning: Function parameter or member 'reserved_tailroom' not described in 'sk_buff'
   include/linux/skbuff.h:862: warning: Function parameter or member 'inner_ipproto' not described in 'sk_buff'
   include/net/sock.h:238: warning: Function parameter or member 'skc_addrpair' not described in 'sock_common'
   include/net/sock.h:238: warning: Function parameter or member 'skc_portpair' not described in 'sock_common'
   include/net/sock.h:238: warning: Function parameter or member 'skc_ipv6only' not described in 'sock_common'
   include/net/sock.h:238: warning: Function parameter or member 'skc_net_refcnt' not described in 'sock_common'
   include/net/sock.h:238: warning: Function parameter or member 'skc_v6_daddr' not described in 'sock_common'
   include/net/sock.h:238: warning: Function parameter or member 'skc_v6_rcv_saddr' not described in 'sock_common'
   include/net/sock.h:238: warning: Function parameter or member 'skc_cookie' not described in 'sock_common'
   include/net/sock.h:238: warning: Function parameter or member 'skc_listener' not described in 'sock_common'

vim +2400 include/net/mac80211.h

1bc0826c8f Johannes Berg          2007-09-18  2242  
7ac1bd6aec Johannes Berg          2007-09-14  2243  /**
7ac1bd6aec Johannes Berg          2007-09-14  2244   * struct ieee80211_hw - hardware information and state
75a5f0ccfd Johannes Berg          2007-09-18  2245   *
75a5f0ccfd Johannes Berg          2007-09-18  2246   * This structure contains the configuration and hardware
75a5f0ccfd Johannes Berg          2007-09-18  2247   * information for an 802.11 PHY.
75a5f0ccfd Johannes Berg          2007-09-18  2248   *
75a5f0ccfd Johannes Berg          2007-09-18  2249   * @wiphy: This points to the &struct wiphy allocated for this
75a5f0ccfd Johannes Berg          2007-09-18  2250   *	802.11 PHY. You must fill in the @perm_addr and @dev
75a5f0ccfd Johannes Berg          2007-09-18  2251   *	members of this structure using SET_IEEE80211_DEV()
8318d78a44 Johannes Berg          2008-01-24  2252   *	and SET_IEEE80211_PERM_ADDR(). Additionally, all supported
8318d78a44 Johannes Berg          2008-01-24  2253   *	bands (with channels, bitrates) are registered here.
75a5f0ccfd Johannes Berg          2007-09-18  2254   *
75a5f0ccfd Johannes Berg          2007-09-18  2255   * @conf: &struct ieee80211_conf, device configuration, don't use.
75a5f0ccfd Johannes Berg          2007-09-18  2256   *
75a5f0ccfd Johannes Berg          2007-09-18  2257   * @priv: pointer to private area that was allocated for driver use
75a5f0ccfd Johannes Berg          2007-09-18  2258   *	along with this structure.
75a5f0ccfd Johannes Berg          2007-09-18  2259   *
75a5f0ccfd Johannes Berg          2007-09-18  2260   * @flags: hardware flags, see &enum ieee80211_hw_flags.
75a5f0ccfd Johannes Berg          2007-09-18  2261   *
75a5f0ccfd Johannes Berg          2007-09-18  2262   * @extra_tx_headroom: headroom to reserve in each transmit skb
75a5f0ccfd Johannes Berg          2007-09-18  2263   *	for use by the driver (e.g. for transmit headers.)
75a5f0ccfd Johannes Berg          2007-09-18  2264   *
70dabeb74e Felix Fietkau          2013-12-14  2265   * @extra_beacon_tailroom: tailroom to reserve in each beacon tx skb.
70dabeb74e Felix Fietkau          2013-12-14  2266   *	Can be used by drivers to add extra IEs.
75a5f0ccfd Johannes Berg          2007-09-18  2267   *
566bfe5a8b Bruno Randolf          2008-05-08  2268   * @max_signal: Maximum value for signal (rssi) in RX information, used
566bfe5a8b Bruno Randolf          2008-05-08  2269   *	only when @IEEE80211_HW_SIGNAL_UNSPEC or @IEEE80211_HW_SIGNAL_DB
75a5f0ccfd Johannes Berg          2007-09-18  2270   *
ea95bba41e Tomas Winkler          2008-07-18  2271   * @max_listen_interval: max listen interval in units of beacon interval
ea95bba41e Tomas Winkler          2008-07-18  2272   *	that HW supports
ea95bba41e Tomas Winkler          2008-07-18  2273   *
75a5f0ccfd Johannes Berg          2007-09-18  2274   * @queues: number of available hardware transmit queues for
e100bb64bf Johannes Berg          2008-04-30  2275   *	data packets. WMM/QoS requires at least four, these
e100bb64bf Johannes Berg          2008-04-30  2276   *	queues need to have configurable access parameters.
e100bb64bf Johannes Berg          2008-04-30  2277   *
830f903866 Johannes Berg          2007-10-28  2278   * @rate_control_algorithm: rate control algorithm for this hardware.
830f903866 Johannes Berg          2007-10-28  2279   *	If unset (NULL), the default algorithm will be used. Must be
830f903866 Johannes Berg          2007-10-28  2280   *	set before calling ieee80211_register_hw().
32bfd35d4b Johannes Berg          2007-12-19  2281   *
32bfd35d4b Johannes Berg          2007-12-19  2282   * @vif_data_size: size (in bytes) of the drv_priv data area
32bfd35d4b Johannes Berg          2007-12-19  2283   *	within &struct ieee80211_vif.
17741cdc26 Johannes Berg          2008-09-11  2284   * @sta_data_size: size (in bytes) of the drv_priv data area
17741cdc26 Johannes Berg          2008-09-11  2285   *	within &struct ieee80211_sta.
d01a1e6586 Michal Kazior          2012-06-26  2286   * @chanctx_data_size: size (in bytes) of the drv_priv data area
d01a1e6586 Michal Kazior          2012-06-26  2287   *	within &struct ieee80211_chanctx_conf.
ba8c3d6f16 Felix Fietkau          2015-03-27  2288   * @txq_data_size: size (in bytes) of the drv_priv data area
ba8c3d6f16 Felix Fietkau          2015-03-27  2289   *	within @struct ieee80211_txq.
870abdf671 Felix Fietkau          2008-10-05  2290   *
78be49ec2a Helmut Schaa           2010-10-02  2291   * @max_rates: maximum number of alternate rate retry stages the hw
78be49ec2a Helmut Schaa           2010-10-02  2292   *	can handle.
78be49ec2a Helmut Schaa           2010-10-02  2293   * @max_report_rates: maximum number of alternate rate retry stages
78be49ec2a Helmut Schaa           2010-10-02  2294   *	the hw can report back.
e6a9854b05 Johannes Berg          2008-10-21  2295   * @max_rate_tries: maximum number of tries for each stage
4e6cbfd09c John W. Linville       2010-07-29  2296   *
df6ba5d80d Luciano Coelho         2011-01-12  2297   * @max_rx_aggregation_subframes: maximum buffer size (number of
df6ba5d80d Luciano Coelho         2011-01-12  2298   *	sub-frames) to be used for A-MPDU block ack receiver
df6ba5d80d Luciano Coelho         2011-01-12  2299   *	aggregation.
df6ba5d80d Luciano Coelho         2011-01-12  2300   *	This is only relevant if the device has restrictions on the
df6ba5d80d Luciano Coelho         2011-01-12  2301   *	number of subframes, if it relies on mac80211 to do reordering
df6ba5d80d Luciano Coelho         2011-01-12  2302   *	it shouldn't be set.
5dd36bc933 Johannes Berg          2011-01-18  2303   *
5dd36bc933 Johannes Berg          2011-01-18  2304   * @max_tx_aggregation_subframes: maximum number of subframes in an
41cbb0f5a2 Luca Coelho            2018-06-09  2305   *	aggregate an HT/HE device will transmit. In HT AddBA we'll
41cbb0f5a2 Luca Coelho            2018-06-09  2306   *	advertise a constant value of 64 as some older APs crash if
41cbb0f5a2 Luca Coelho            2018-06-09  2307   *	the window size is smaller (an example is LinkSys WRT120N
41cbb0f5a2 Luca Coelho            2018-06-09  2308   *	with FW v1.0.07 build 002 Jun 18 2012).
41cbb0f5a2 Luca Coelho            2018-06-09  2309   *	For AddBA to HE capable peers this value will be used.
3a25a8c8b7 Johannes Berg          2012-04-03  2310   *
6e0456b545 Felix Fietkau          2016-03-03  2311   * @max_tx_fragments: maximum number of tx buffers per (A)-MSDU, sum
6e0456b545 Felix Fietkau          2016-03-03  2312   *	of 1 + skb_shinfo(skb)->nr_frags for each skb in the frag_list.
6e0456b545 Felix Fietkau          2016-03-03  2313   *
3a25a8c8b7 Johannes Berg          2012-04-03  2314   * @offchannel_tx_hw_queue: HW queue ID to use for offchannel TX
3a25a8c8b7 Johannes Berg          2012-04-03  2315   *	(if %IEEE80211_HW_QUEUE_CONTROL is set)
ac55d2fe05 Johannes Berg          2012-05-10  2316   *
ac55d2fe05 Johannes Berg          2012-05-10  2317   * @radiotap_mcs_details: lists which MCS information can the HW
ac55d2fe05 Johannes Berg          2012-05-10  2318   *	reports, by default it is set to _MCS, _GI and _BW but doesn't
b4f7f4ad42 Jani Nikula            2016-10-21  2319   *	include _FMT. Use %IEEE80211_RADIOTAP_MCS_HAVE_\* values, only
ac55d2fe05 Johannes Berg          2012-05-10  2320   *	adding _BW is supported today.
72d7872852 Arik Nemtsov           2012-05-10  2321   *
5164892184 Johannes Berg          2012-11-22  2322   * @radiotap_vht_details: lists which VHT MCS information the HW reports,
5164892184 Johannes Berg          2012-11-22  2323   *	the default is _GI | _BANDWIDTH.
b4f7f4ad42 Jani Nikula            2016-10-21  2324   *	Use the %IEEE80211_RADIOTAP_VHT_KNOWN_\* values.
5164892184 Johannes Berg          2012-11-22  2325   *
41cbb0f5a2 Luca Coelho            2018-06-09  2326   * @radiotap_he: HE radiotap validity flags
41cbb0f5a2 Luca Coelho            2018-06-09  2327   *
99ee7cae3b Johannes Berg          2016-08-29  2328   * @radiotap_timestamp: Information for the radiotap timestamp field; if the
99ee7cae3b Johannes Berg          2016-08-29  2329   *	'units_pos' member is set to a non-negative value it must be set to
99ee7cae3b Johannes Berg          2016-08-29  2330   *	a combination of a IEEE80211_RADIOTAP_TIMESTAMP_UNIT_* and a
99ee7cae3b Johannes Berg          2016-08-29  2331   *	IEEE80211_RADIOTAP_TIMESTAMP_SPOS_* value, and then the timestamp
99ee7cae3b Johannes Berg          2016-08-29  2332   *	field will be added and populated from the &struct ieee80211_rx_status
99ee7cae3b Johannes Berg          2016-08-29  2333   *	device_timestamp. If the 'accuracy' member is non-negative, it's put
99ee7cae3b Johannes Berg          2016-08-29  2334   *	into the accuracy radiotap field and the accuracy known flag is set.
99ee7cae3b Johannes Berg          2016-08-29  2335   *
72d7872852 Arik Nemtsov           2012-05-10  2336   * @netdev_features: netdev features to be set in each netdev created
680a0daba7 Johannes Berg          2015-04-13  2337   *	from this HW. Note that not all features are usable with mac80211,
680a0daba7 Johannes Berg          2015-04-13  2338   *	other features will be rejected during HW registration.
219c38674c Alexander Bondar       2013-01-22  2339   *
219c38674c Alexander Bondar       2013-01-22  2340   * @uapsd_queues: This bitmap is included in (re)association frame to indicate
219c38674c Alexander Bondar       2013-01-22  2341   *	for each access category if it is uAPSD trigger-enabled and delivery-
219c38674c Alexander Bondar       2013-01-22  2342   *	enabled. Use IEEE80211_WMM_IE_STA_QOSINFO_AC_* to set this bitmap.
219c38674c Alexander Bondar       2013-01-22  2343   *	Each bit corresponds to different AC. Value '1' in specific bit means
219c38674c Alexander Bondar       2013-01-22  2344   *	that corresponding AC is both trigger- and delivery-enabled. '0' means
219c38674c Alexander Bondar       2013-01-22  2345   *	neither enabled.
219c38674c Alexander Bondar       2013-01-22  2346   *
219c38674c Alexander Bondar       2013-01-22  2347   * @uapsd_max_sp_len: maximum number of total buffered frames the WMM AP may
219c38674c Alexander Bondar       2013-01-22  2348   *	deliver to a WMM STA during any Service Period triggered by the WMM STA.
219c38674c Alexander Bondar       2013-01-22  2349   *	Use IEEE80211_WMM_IE_STA_QOSINFO_SP_* for correct values.
2475b1cc0d Max Stepanov           2013-03-24  2350   *
2475b1cc0d Max Stepanov           2013-03-24  2351   * @n_cipher_schemes: a size of an array of cipher schemes definitions.
2475b1cc0d Max Stepanov           2013-03-24  2352   * @cipher_schemes: a pointer to an array of cipher scheme definitions
2475b1cc0d Max Stepanov           2013-03-24  2353   *	supported by HW.
167e33f4f6 Ayala Beker            2016-09-20  2354   * @max_nan_de_entries: maximum number of NAN DE functions supported by the
167e33f4f6 Ayala Beker            2016-09-20  2355   *	device.
70e53669c4 Wen Gong               2018-08-08  2356   *
70e53669c4 Wen Gong               2018-08-08  2357   * @tx_sk_pacing_shift: Pacing shift to set on TCP sockets when frames from
70e53669c4 Wen Gong               2018-08-08  2358   *	them are encountered. The default should typically not be changed,
70e53669c4 Wen Gong               2018-08-08  2359   *	unless the driver has good reasons for needing more buffers.
1053390d02 Toke Høiland-Jørgensen 2018-12-18  2360   *
1053390d02 Toke Høiland-Jørgensen 2018-12-18  2361   * @weight_multipler: Driver specific airtime weight multiplier used while
1053390d02 Toke Høiland-Jørgensen 2018-12-18  2362   *	refilling deficit of each TXQ.
7ac1bd6aec Johannes Berg          2007-09-14  2363   */
f0706e828e Jiri Benc              2007-05-05  2364  struct ieee80211_hw {
f0706e828e Jiri Benc              2007-05-05  2365  	struct ieee80211_conf conf;
75a5f0ccfd Johannes Berg          2007-09-18  2366  	struct wiphy *wiphy;
830f903866 Johannes Berg          2007-10-28  2367  	const char *rate_control_algorithm;
f0706e828e Jiri Benc              2007-05-05  2368  	void *priv;
30686bf7f5 Johannes Berg          2015-06-02  2369  	unsigned long flags[BITS_TO_LONGS(NUM_IEEE80211_HW_FLAGS)];
f0706e828e Jiri Benc              2007-05-05  2370  	unsigned int extra_tx_headroom;
70dabeb74e Felix Fietkau          2013-12-14  2371  	unsigned int extra_beacon_tailroom;
32bfd35d4b Johannes Berg          2007-12-19  2372  	int vif_data_size;
17741cdc26 Johannes Berg          2008-09-11  2373  	int sta_data_size;
d01a1e6586 Michal Kazior          2012-06-26  2374  	int chanctx_data_size;
ba8c3d6f16 Felix Fietkau          2015-03-27  2375  	int txq_data_size;
ea95bba41e Tomas Winkler          2008-07-18  2376  	u16 queues;
ea95bba41e Tomas Winkler          2008-07-18  2377  	u16 max_listen_interval;
f0706e828e Jiri Benc              2007-05-05  2378  	s8 max_signal;
e6a9854b05 Johannes Berg          2008-10-21  2379  	u8 max_rates;
78be49ec2a Helmut Schaa           2010-10-02  2380  	u8 max_report_rates;
e6a9854b05 Johannes Berg          2008-10-21  2381  	u8 max_rate_tries;
41cbb0f5a2 Luca Coelho            2018-06-09  2382  	u16 max_rx_aggregation_subframes;
41cbb0f5a2 Luca Coelho            2018-06-09  2383  	u16 max_tx_aggregation_subframes;
6e0456b545 Felix Fietkau          2016-03-03  2384  	u8 max_tx_fragments;
3a25a8c8b7 Johannes Berg          2012-04-03  2385  	u8 offchannel_tx_hw_queue;
ac55d2fe05 Johannes Berg          2012-05-10  2386  	u8 radiotap_mcs_details;
5164892184 Johannes Berg          2012-11-22  2387  	u16 radiotap_vht_details;
99ee7cae3b Johannes Berg          2016-08-29  2388  	struct {
99ee7cae3b Johannes Berg          2016-08-29  2389  		int units_pos;
99ee7cae3b Johannes Berg          2016-08-29  2390  		s16 accuracy;
99ee7cae3b Johannes Berg          2016-08-29  2391  	} radiotap_timestamp;
72d7872852 Arik Nemtsov           2012-05-10  2392  	netdev_features_t netdev_features;
219c38674c Alexander Bondar       2013-01-22  2393  	u8 uapsd_queues;
219c38674c Alexander Bondar       2013-01-22  2394  	u8 uapsd_max_sp_len;
2475b1cc0d Max Stepanov           2013-03-24  2395  	u8 n_cipher_schemes;
2475b1cc0d Max Stepanov           2013-03-24  2396  	const struct ieee80211_cipher_scheme *cipher_schemes;
167e33f4f6 Ayala Beker            2016-09-20  2397  	u8 max_nan_de_entries;
70e53669c4 Wen Gong               2018-08-08  2398  	u8 tx_sk_pacing_shift;
1053390d02 Toke Høiland-Jørgensen 2018-12-18  2399  	u8 weight_multiplier;
f0706e828e Jiri Benc              2007-05-05 @2400  };
f0706e828e Jiri Benc              2007-05-05  2401  

:::::: The code at line 2400 was first introduced by commit
:::::: f0706e828e96d0fa4e80c0d25aa98523f6d589a0 [MAC80211]: Add mac80211 wireless stack.

:::::: TO: Jiri Benc <jbenc@suse.cz>
:::::: CC: David S. Miller <davem@davemloft.net>

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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Re: [PATCH v5 5/6] ath10k: migrate to mac80211 txq scheduling

[Rajkumar Manoharan]

On 2018-12-19 05:24, Kalle Valo wrote:
> Rajkumar Manoharan <rmanohar@codeaurora.org> writes:
> 
>> From: Toke Høiland-Jørgensen <toke@toke.dk>
>> 
>> ath10k maintains common txqs list for all stations. This txq
>> management can be removed by migrating to mac80211 txq APIs
>> and let mac80211 handle txqs reordering based on reported airtime.
>> By doing this, txq fairness maintained in ath10k i.e processing
>> N frames per txq is removed. By adapting to mac80211 APIs,
>> ath10k will support mac80211 based airtime fairness algorithm.
>> 
>> Tested-by: Venkateswara Naralasetty <vnaralas@codeaurora.org>
>> Co-developed-by: Rajkumar Manoharan <rmanohar@codeaurora.org>
>> Signed-off-by: Toke Høiland-Jørgensen <toke@toke.dk>
>> Signed-off-by: Rajkumar Manoharan <rmanohar@codeaurora.org>
> 
> Please always add hardware and firmware versions used for testing. But 
> I
> can add that, so no need to resend because of this. Just let me know
> what to add.
> 
Thanks Kalle. Please amend the commit log with

Tested on QCA4019 with firmware version 10.4-3.2.1.1-00015
Tested on QCA9984 with firmware version 10.4-3.9.0.1-00005

-Rajkumar

Re: [PATCH v5 4/6] ath9k: Switch to mac80211 TXQ scheduling and airtime APIs

[Toke Høiland-Jørgensen]

Just discovered this while working on my follow-up:

>  void ath_tx_queue_tid(struct ath_softc *sc, struct ath_atx_tid *tid)
>  {
> -	struct ath_vif *avp = (struct ath_vif *) tid->an->vif->drv_priv;
> -	struct ath_chanctx *ctx = avp->chanctx;
> -	struct ath_acq *acq;
> +	struct ieee80211_txq *queue =
> +		container_of((void *)tid, struct ieee80211_txq, drv_priv);
>  
> -	if (!ctx || !list_empty(&tid->list))
> -		return;
> -
> -	acq = &ctx->acq[TID_TO_WME_AC(tid->tidno)];
> -	spin_lock_bh(&acq->lock);
> -	__ath_tx_queue_tid(sc, tid);
> -	spin_unlock_bh(&acq->lock);
> +	ieee80211_return_txq(sc->hw, queue);
>  }

After we evolved the API, this is now wrong, as ieee80211_return_txq()
should only be called while holding the right lock. I'll post a fixed
version tomorrow.

-Toke