1 files changed, 628 insertions, 0 deletions

diff --git a/drivers/net/wireless/mediatek/mt76/tx.c b/drivers/net/wireless/mediatek/mt76/tx.c
new file mode 100644
index 000000000..073c29eb2
--- /dev/null
+++ b/drivers/net/wireless/mediatek/mt76/tx.c
@@ -0,0 +1,628 @@
+// SPDX-License-Identifier: ISC
+/*
+ * Copyright (C) 2016 Felix Fietkau <nbd@nbd.name>
+ */
+
+#include "mt76.h"
+
+static int
+mt76_txq_get_qid(struct ieee80211_txq *txq)
+{
+	if (!txq->sta)
+		return MT_TXQ_BE;
+
+	return txq->ac;
+}
+
+void
+mt76_tx_check_agg_ssn(struct ieee80211_sta *sta, struct sk_buff *skb)
+{
+	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
+	struct ieee80211_txq *txq;
+	struct mt76_txq *mtxq;
+	u8 tid;
+
+	if (!sta || !ieee80211_is_data_qos(hdr->frame_control) ||
+	    !ieee80211_is_data_present(hdr->frame_control))
+		return;
+
+	tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
+	txq = sta->txq[tid];
+	mtxq = (struct mt76_txq *)txq->drv_priv;
+	if (!mtxq->aggr)
+		return;
+
+	mtxq->agg_ssn = le16_to_cpu(hdr->seq_ctrl) + 0x10;
+}
+EXPORT_SYMBOL_GPL(mt76_tx_check_agg_ssn);
+
+void
+mt76_tx_status_lock(struct mt76_dev *dev, struct sk_buff_head *list)
+		   __acquires(&dev->status_list.lock)
+{
+	__skb_queue_head_init(list);
+	spin_lock_bh(&dev->status_list.lock);
+}
+EXPORT_SYMBOL_GPL(mt76_tx_status_lock);
+
+void
+mt76_tx_status_unlock(struct mt76_dev *dev, struct sk_buff_head *list)
+		      __releases(&dev->status_list.lock)
+{
+	struct ieee80211_hw *hw;
+	struct sk_buff *skb;
+
+	spin_unlock_bh(&dev->status_list.lock);
+
+	while ((skb = __skb_dequeue(list)) != NULL) {
+		hw = mt76_tx_status_get_hw(dev, skb);
+		ieee80211_tx_status(hw, skb);
+	}
+
+}
+EXPORT_SYMBOL_GPL(mt76_tx_status_unlock);
+
+static void
+__mt76_tx_status_skb_done(struct mt76_dev *dev, struct sk_buff *skb, u8 flags,
+			  struct sk_buff_head *list)
+{
+	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+	struct mt76_tx_cb *cb = mt76_tx_skb_cb(skb);
+	u8 done = MT_TX_CB_DMA_DONE | MT_TX_CB_TXS_DONE;
+
+	flags |= cb->flags;
+	cb->flags = flags;
+
+	if ((flags & done) != done)
+		return;
+
+	__skb_unlink(skb, &dev->status_list);
+
+	/* Tx status can be unreliable. if it fails, mark the frame as ACKed */
+	if (flags & MT_TX_CB_TXS_FAILED) {
+		ieee80211_tx_info_clear_status(info);
+		info->status.rates[0].idx = -1;
+		info->flags |= IEEE80211_TX_STAT_ACK;
+	}
+
+	__skb_queue_tail(list, skb);
+}
+
+void
+mt76_tx_status_skb_done(struct mt76_dev *dev, struct sk_buff *skb,
+			struct sk_buff_head *list)
+{
+	__mt76_tx_status_skb_done(dev, skb, MT_TX_CB_TXS_DONE, list);
+}
+EXPORT_SYMBOL_GPL(mt76_tx_status_skb_done);
+
+int
+mt76_tx_status_skb_add(struct mt76_dev *dev, struct mt76_wcid *wcid,
+		       struct sk_buff *skb)
+{
+	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+	struct mt76_tx_cb *cb = mt76_tx_skb_cb(skb);
+	int pid;
+
+	if (!wcid)
+		return MT_PACKET_ID_NO_ACK;
+
+	if (info->flags & IEEE80211_TX_CTL_NO_ACK)
+		return MT_PACKET_ID_NO_ACK;
+
+	if (!(info->flags & (IEEE80211_TX_CTL_REQ_TX_STATUS |
+			     IEEE80211_TX_CTL_RATE_CTRL_PROBE)))
+		return MT_PACKET_ID_NO_SKB;
+
+	spin_lock_bh(&dev->status_list.lock);
+
+	memset(cb, 0, sizeof(*cb));
+	wcid->packet_id = (wcid->packet_id + 1) & MT_PACKET_ID_MASK;
+	if (wcid->packet_id == MT_PACKET_ID_NO_ACK ||
+	    wcid->packet_id == MT_PACKET_ID_NO_SKB)
+		wcid->packet_id = MT_PACKET_ID_FIRST;
+
+	pid = wcid->packet_id;
+	cb->wcid = wcid->idx;
+	cb->pktid = pid;
+	cb->jiffies = jiffies;
+
+	__skb_queue_tail(&dev->status_list, skb);
+	spin_unlock_bh(&dev->status_list.lock);
+
+	return pid;
+}
+EXPORT_SYMBOL_GPL(mt76_tx_status_skb_add);
+
+struct sk_buff *
+mt76_tx_status_skb_get(struct mt76_dev *dev, struct mt76_wcid *wcid, int pktid,
+		       struct sk_buff_head *list)
+{
+	struct sk_buff *skb, *tmp;
+
+	skb_queue_walk_safe(&dev->status_list, skb, tmp) {
+		struct mt76_tx_cb *cb = mt76_tx_skb_cb(skb);
+
+		if (wcid && cb->wcid != wcid->idx)
+			continue;
+
+		if (cb->pktid == pktid)
+			return skb;
+
+		if (pktid >= 0 && !time_after(jiffies, cb->jiffies +
+					      MT_TX_STATUS_SKB_TIMEOUT))
+			continue;
+
+		__mt76_tx_status_skb_done(dev, skb, MT_TX_CB_TXS_FAILED |
+						    MT_TX_CB_TXS_DONE, list);
+	}
+
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(mt76_tx_status_skb_get);
+
+void
+mt76_tx_status_check(struct mt76_dev *dev, struct mt76_wcid *wcid, bool flush)
+{
+	struct sk_buff_head list;
+
+	mt76_tx_status_lock(dev, &list);
+	mt76_tx_status_skb_get(dev, wcid, flush ? -1 : 0, &list);
+	mt76_tx_status_unlock(dev, &list);
+}
+EXPORT_SYMBOL_GPL(mt76_tx_status_check);
+
+static void
+mt76_tx_check_non_aql(struct mt76_dev *dev, u16 wcid_idx, struct sk_buff *skb)
+{
+	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+	struct mt76_wcid *wcid;
+	int pending;
+
+	if (info->tx_time_est)
+		return;
+
+	if (wcid_idx >= ARRAY_SIZE(dev->wcid))
+		return;
+
+	rcu_read_lock();
+
+	wcid = rcu_dereference(dev->wcid[wcid_idx]);
+	if (wcid) {
+		pending = atomic_dec_return(&wcid->non_aql_packets);
+		if (pending < 0)
+			atomic_cmpxchg(&wcid->non_aql_packets, pending, 0);
+	}
+
+	rcu_read_unlock();
+}
+
+void mt76_tx_complete_skb(struct mt76_dev *dev, u16 wcid_idx, struct sk_buff *skb)
+{
+	struct ieee80211_hw *hw;
+	struct sk_buff_head list;
+
+#ifdef CONFIG_NL80211_TESTMODE
+	if (skb == dev->test.tx_skb) {
+		dev->test.tx_done++;
+		if (dev->test.tx_queued == dev->test.tx_done)
+			wake_up(&dev->tx_wait);
+	}
+#endif
+
+	mt76_tx_check_non_aql(dev, wcid_idx, skb);
+
+	if (!skb->prev) {
+		hw = mt76_tx_status_get_hw(dev, skb);
+		ieee80211_free_txskb(hw, skb);
+		return;
+	}
+
+	mt76_tx_status_lock(dev, &list);
+	__mt76_tx_status_skb_done(dev, skb, MT_TX_CB_DMA_DONE, &list);
+	mt76_tx_status_unlock(dev, &list);
+}
+EXPORT_SYMBOL_GPL(mt76_tx_complete_skb);
+
+static int
+__mt76_tx_queue_skb(struct mt76_dev *dev, int qid, struct sk_buff *skb,
+		    struct mt76_wcid *wcid, struct ieee80211_sta *sta,
+		    bool *stop)
+{
+	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+	struct mt76_queue *q;
+	bool non_aql;
+	int pending;
+	int idx;
+
+	non_aql = !info->tx_time_est;
+	idx = dev->queue_ops->tx_queue_skb(dev, qid, skb, wcid, sta);
+	if (idx < 0 || !sta || !non_aql)
+		return idx;
+
+	wcid = (struct mt76_wcid *)sta->drv_priv;
+	q = dev->q_tx[qid];
+	q->entry[idx].wcid = wcid->idx;
+	pending = atomic_inc_return(&wcid->non_aql_packets);
+	if (stop && pending >= MT_MAX_NON_AQL_PKT)
+		*stop = true;
+
+	return idx;
+}
+
+void
+mt76_tx(struct mt76_phy *phy, struct ieee80211_sta *sta,
+	struct mt76_wcid *wcid, struct sk_buff *skb)
+{
+	struct mt76_dev *dev = phy->dev;
+	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
+	struct mt76_queue *q;
+	int qid = skb_get_queue_mapping(skb);
+	bool ext_phy = phy != &dev->phy;
+
+	if (mt76_testmode_enabled(dev)) {
+		ieee80211_free_txskb(phy->hw, skb);
+		return;
+	}
+
+	if (WARN_ON(qid >= MT_TXQ_PSD)) {
+		qid = MT_TXQ_BE;
+		skb_set_queue_mapping(skb, qid);
+	}
+
+	if ((dev->drv->drv_flags & MT_DRV_HW_MGMT_TXQ) &&
+	    !ieee80211_is_data(hdr->frame_control) &&
+	    !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) {
+		qid = MT_TXQ_PSD;
+		skb_set_queue_mapping(skb, qid);
+	}
+
+	if (wcid && !(wcid->tx_info & MT_WCID_TX_INFO_SET))
+		ieee80211_get_tx_rates(info->control.vif, sta, skb,
+				       info->control.rates, 1);
+
+	if (ext_phy)
+		info->hw_queue |= MT_TX_HW_QUEUE_EXT_PHY;
+
+	q = dev->q_tx[qid];
+
+	spin_lock_bh(&q->lock);
+	__mt76_tx_queue_skb(dev, qid, skb, wcid, sta, NULL);
+	dev->queue_ops->kick(dev, q);
+
+	if (q->queued > q->ndesc - 8 && !q->stopped) {
+		ieee80211_stop_queue(phy->hw, skb_get_queue_mapping(skb));
+		q->stopped = true;
+	}
+
+	spin_unlock_bh(&q->lock);
+}
+EXPORT_SYMBOL_GPL(mt76_tx);
+
+static struct sk_buff *
+mt76_txq_dequeue(struct mt76_phy *phy, struct mt76_txq *mtxq)
+{
+	struct ieee80211_txq *txq = mtxq_to_txq(mtxq);
+	struct ieee80211_tx_info *info;
+	bool ext_phy = phy != &phy->dev->phy;
+	struct sk_buff *skb;
+
+	skb = ieee80211_tx_dequeue(phy->hw, txq);
+	if (!skb)
+		return NULL;
+
+	info = IEEE80211_SKB_CB(skb);
+	if (ext_phy)
+		info->hw_queue |= MT_TX_HW_QUEUE_EXT_PHY;
+
+	return skb;
+}
+
+static void
+mt76_queue_ps_skb(struct mt76_dev *dev, struct ieee80211_sta *sta,
+		  struct sk_buff *skb, bool last)
+{
+	struct mt76_wcid *wcid = (struct mt76_wcid *)sta->drv_priv;
+	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+
+	info->control.flags |= IEEE80211_TX_CTRL_PS_RESPONSE;
+	if (last)
+		info->flags |= IEEE80211_TX_STATUS_EOSP |
+			       IEEE80211_TX_CTL_REQ_TX_STATUS;
+
+	mt76_skb_set_moredata(skb, !last);
+	__mt76_tx_queue_skb(dev, MT_TXQ_PSD, skb, wcid, sta, NULL);
+}
+
+void
+mt76_release_buffered_frames(struct ieee80211_hw *hw, struct ieee80211_sta *sta,
+			     u16 tids, int nframes,
+			     enum ieee80211_frame_release_type reason,
+			     bool more_data)
+{
+	struct mt76_phy *phy = hw->priv;
+	struct mt76_dev *dev = phy->dev;
+	struct sk_buff *last_skb = NULL;
+	struct mt76_queue *hwq = dev->q_tx[MT_TXQ_PSD];
+	int i;
+
+	spin_lock_bh(&hwq->lock);
+	for (i = 0; tids && nframes; i++, tids >>= 1) {
+		struct ieee80211_txq *txq = sta->txq[i];
+		struct mt76_txq *mtxq = (struct mt76_txq *)txq->drv_priv;
+		struct sk_buff *skb;
+
+		if (!(tids & 1))
+			continue;
+
+		do {
+			skb = mt76_txq_dequeue(phy, mtxq);
+			if (!skb)
+				break;
+
+			nframes--;
+			if (last_skb)
+				mt76_queue_ps_skb(dev, sta, last_skb, false);
+
+			last_skb = skb;
+		} while (nframes);
+	}
+
+	if (last_skb) {
+		mt76_queue_ps_skb(dev, sta, last_skb, true);
+		dev->queue_ops->kick(dev, hwq);
+	} else {
+		ieee80211_sta_eosp(sta);
+	}
+
+	spin_unlock_bh(&hwq->lock);
+}
+EXPORT_SYMBOL_GPL(mt76_release_buffered_frames);
+
+static int
+mt76_txq_send_burst(struct mt76_phy *phy, struct mt76_queue *q,
+		    struct mt76_txq *mtxq)
+{
+	struct mt76_dev *dev = phy->dev;
+	struct ieee80211_txq *txq = mtxq_to_txq(mtxq);
+	enum mt76_txq_id qid = mt76_txq_get_qid(txq);
+	struct mt76_wcid *wcid = mtxq->wcid;
+	struct ieee80211_tx_info *info;
+	struct sk_buff *skb;
+	int n_frames = 1;
+	bool stop = false;
+	int idx;
+
+	if (test_bit(MT_WCID_FLAG_PS, &wcid->flags))
+		return 0;
+
+	if (atomic_read(&wcid->non_aql_packets) >= MT_MAX_NON_AQL_PKT)
+		return 0;
+
+	skb = mt76_txq_dequeue(phy, mtxq);
+	if (!skb)
+		return 0;
+
+	info = IEEE80211_SKB_CB(skb);
+	if (!(wcid->tx_info & MT_WCID_TX_INFO_SET))
+		ieee80211_get_tx_rates(txq->vif, txq->sta, skb,
+				       info->control.rates, 1);
+
+	idx = __mt76_tx_queue_skb(dev, qid, skb, wcid, txq->sta, &stop);
+	if (idx < 0)
+		return idx;
+
+	do {
+		if (test_bit(MT76_STATE_PM, &phy->state) ||
+		    test_bit(MT76_RESET, &phy->state))
+			return -EBUSY;
+
+		if (stop)
+			break;
+
+		if (q->queued + MT_TXQ_FREE_THR >= q->ndesc)
+			break;
+
+		skb = mt76_txq_dequeue(phy, mtxq);
+		if (!skb)
+			break;
+
+		info = IEEE80211_SKB_CB(skb);
+		if (!(wcid->tx_info & MT_WCID_TX_INFO_SET))
+			ieee80211_get_tx_rates(txq->vif, txq->sta, skb,
+					       info->control.rates, 1);
+
+		idx = __mt76_tx_queue_skb(dev, qid, skb, wcid, txq->sta, &stop);
+		if (idx < 0)
+			break;
+
+		n_frames++;
+	} while (1);
+
+	dev->queue_ops->kick(dev, q);
+
+	return n_frames;
+}
+
+static int
+mt76_txq_schedule_list(struct mt76_phy *phy, enum mt76_txq_id qid)
+{
+	struct mt76_dev *dev = phy->dev;
+	struct mt76_queue *q = dev->q_tx[qid];
+	struct ieee80211_txq *txq;
+	struct mt76_txq *mtxq;
+	struct mt76_wcid *wcid;
+	int ret = 0;
+
+	spin_lock_bh(&q->lock);
+	while (1) {
+		if (test_bit(MT76_STATE_PM, &phy->state) ||
+		    test_bit(MT76_RESET, &phy->state)) {
+			ret = -EBUSY;
+			break;
+		}
+
+		if (q->queued + MT_TXQ_FREE_THR >= q->ndesc)
+			break;
+
+		txq = ieee80211_next_txq(phy->hw, qid);
+		if (!txq)
+			break;
+
+		mtxq = (struct mt76_txq *)txq->drv_priv;
+		wcid = mtxq->wcid;
+		if (wcid && test_bit(MT_WCID_FLAG_PS, &wcid->flags))
+			continue;
+
+		if (mtxq->send_bar && mtxq->aggr) {
+			struct ieee80211_txq *txq = mtxq_to_txq(mtxq);
+			struct ieee80211_sta *sta = txq->sta;
+			struct ieee80211_vif *vif = txq->vif;
+			u16 agg_ssn = mtxq->agg_ssn;
+			u8 tid = txq->tid;
+
+			mtxq->send_bar = false;
+			spin_unlock_bh(&q->lock);
+			ieee80211_send_bar(vif, sta->addr, tid, agg_ssn);
+			spin_lock_bh(&q->lock);
+		}
+
+		ret += mt76_txq_send_burst(phy, q, mtxq);
+		ieee80211_return_txq(phy->hw, txq, false);
+	}
+	spin_unlock_bh(&q->lock);
+
+	return ret;
+}
+
+void mt76_txq_schedule(struct mt76_phy *phy, enum mt76_txq_id qid)
+{
+	int len;
+
+	if (qid >= 4)
+		return;
+
+	rcu_read_lock();
+
+	do {
+		ieee80211_txq_schedule_start(phy->hw, qid);
+		len = mt76_txq_schedule_list(phy, qid);
+		ieee80211_txq_schedule_end(phy->hw, qid);
+	} while (len > 0);
+
+	rcu_read_unlock();
+}
+EXPORT_SYMBOL_GPL(mt76_txq_schedule);
+
+void mt76_txq_schedule_all(struct mt76_phy *phy)
+{
+	int i;
+
+	for (i = 0; i <= MT_TXQ_BK; i++)
+		mt76_txq_schedule(phy, i);
+}
+EXPORT_SYMBOL_GPL(mt76_txq_schedule_all);
+
+void mt76_tx_worker(struct mt76_worker *w)
+{
+	struct mt76_dev *dev = container_of(w, struct mt76_dev, tx_worker);
+
+	mt76_txq_schedule_all(&dev->phy);
+	if (dev->phy2)
+		mt76_txq_schedule_all(dev->phy2);
+
+#ifdef CONFIG_NL80211_TESTMODE
+	if (dev->test.tx_pending)
+		mt76_testmode_tx_pending(dev);
+#endif
+}
+
+void mt76_stop_tx_queues(struct mt76_dev *dev, struct ieee80211_sta *sta,
+			 bool send_bar)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(sta->txq); i++) {
+		struct ieee80211_txq *txq = sta->txq[i];
+		struct mt76_queue *hwq;
+		struct mt76_txq *mtxq;
+
+		if (!txq)
+			continue;
+
+		hwq = dev->q_tx[mt76_txq_get_qid(txq)];
+		mtxq = (struct mt76_txq *)txq->drv_priv;
+
+		spin_lock_bh(&hwq->lock);
+		mtxq->send_bar = mtxq->aggr && send_bar;
+		spin_unlock_bh(&hwq->lock);
+	}
+}
+EXPORT_SYMBOL_GPL(mt76_stop_tx_queues);
+
+void mt76_wake_tx_queue(struct ieee80211_hw *hw, struct ieee80211_txq *txq)
+{
+	struct mt76_phy *phy = hw->priv;
+	struct mt76_dev *dev = phy->dev;
+
+	if (!test_bit(MT76_STATE_RUNNING, &phy->state))
+		return;
+
+	mt76_worker_schedule(&dev->tx_worker);
+}
+EXPORT_SYMBOL_GPL(mt76_wake_tx_queue);
+
+u8 mt76_ac_to_hwq(u8 ac)
+{
+	static const u8 wmm_queue_map[] = {
+		[IEEE80211_AC_BE] = 0,
+		[IEEE80211_AC_BK] = 1,
+		[IEEE80211_AC_VI] = 2,
+		[IEEE80211_AC_VO] = 3,
+	};
+
+	if (WARN_ON(ac >= IEEE80211_NUM_ACS))
+		return 0;
+
+	return wmm_queue_map[ac];
+}
+EXPORT_SYMBOL_GPL(mt76_ac_to_hwq);
+
+int mt76_skb_adjust_pad(struct sk_buff *skb, int pad)
+{
+	struct sk_buff *iter, *last = skb;
+
+	/* First packet of a A-MSDU burst keeps track of the whole burst
+	 * length, need to update length of it and the last packet.
+	 */
+	skb_walk_frags(skb, iter) {
+		last = iter;
+		if (!iter->next) {
+			skb->data_len += pad;
+			skb->len += pad;
+			break;
+		}
+	}
+
+	if (skb_pad(last, pad))
+		return -ENOMEM;
+
+	__skb_put(last, pad);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(mt76_skb_adjust_pad);
+
+void mt76_queue_tx_complete(struct mt76_dev *dev, struct mt76_queue *q,
+			    struct mt76_queue_entry *e)
+{
+	if (e->skb)
+		dev->drv->tx_complete_skb(dev, e);
+
+	spin_lock_bh(&q->lock);
+	q->tail = (q->tail + 1) % q->ndesc;
+	q->queued--;
+	spin_unlock_bh(&q->lock);
+}
+EXPORT_SYMBOL_GPL(mt76_queue_tx_complete);