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// SPDX-License-Identifier: ISC
/*
* Copyright (C) 2016 Felix Fietkau <nbd@nbd.name>
*/
#include "mt76.h"
static struct mt76_txwi_cache *
mt76_alloc_txwi(struct mt76_dev *dev)
{
struct mt76_txwi_cache *t;
dma_addr_t addr;
u8 *txwi;
int size;
size = L1_CACHE_ALIGN(dev->drv->txwi_size + sizeof(*t));
txwi = devm_kzalloc(dev->dev, size, GFP_ATOMIC);
if (!txwi)
return NULL;
addr = dma_map_single(dev->dev, txwi, dev->drv->txwi_size,
DMA_TO_DEVICE);
t = (struct mt76_txwi_cache *)(txwi + dev->drv->txwi_size);
t->dma_addr = addr;
return t;
}
static struct mt76_txwi_cache *
__mt76_get_txwi(struct mt76_dev *dev)
{
struct mt76_txwi_cache *t = NULL;
spin_lock_bh(&dev->lock);
if (!list_empty(&dev->txwi_cache)) {
t = list_first_entry(&dev->txwi_cache, struct mt76_txwi_cache,
list);
list_del(&t->list);
}
spin_unlock_bh(&dev->lock);
return t;
}
struct mt76_txwi_cache *
mt76_get_txwi(struct mt76_dev *dev)
{
struct mt76_txwi_cache *t = __mt76_get_txwi(dev);
if (t)
return t;
return mt76_alloc_txwi(dev);
}
void
mt76_put_txwi(struct mt76_dev *dev, struct mt76_txwi_cache *t)
{
if (!t)
return;
spin_lock_bh(&dev->lock);
list_add(&t->list, &dev->txwi_cache);
spin_unlock_bh(&dev->lock);
}
EXPORT_SYMBOL_GPL(mt76_put_txwi);
void mt76_tx_free(struct mt76_dev *dev)
{
struct mt76_txwi_cache *t;
while ((t = __mt76_get_txwi(dev)) != NULL)
dma_unmap_single(dev->dev, t->dma_addr, dev->drv->txwi_size,
DMA_TO_DEVICE);
}
static int
mt76_txq_get_qid(struct ieee80211_txq *txq)
{
if (!txq->sta)
return MT_TXQ_BE;
return txq->ac;
}
static void
mt76_check_agg_ssn(struct mt76_txq *mtxq, struct sk_buff *skb)
{
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
if (!ieee80211_is_data_qos(hdr->frame_control) ||
!ieee80211_is_data_present(hdr->frame_control))
return;
mtxq->agg_ssn = le16_to_cpu(hdr->seq_ctrl) + 0x10;
}
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);
void mt76_tx_complete_skb(struct mt76_dev *dev, 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
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);
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->tx_info & MT_WCID_TX_INFO_SET))
ieee80211_get_tx_rates(info->control.vif, sta, skb,
info->control.rates, 1);
if (sta && ieee80211_is_data_qos(hdr->frame_control)) {
struct ieee80211_txq *txq;
struct mt76_txq *mtxq;
u8 tid;
tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
txq = sta->txq[tid];
mtxq = (struct mt76_txq *)txq->drv_priv;
if (mtxq->aggr)
mt76_check_agg_ssn(mtxq, skb);
}
if (ext_phy)
info->hw_queue |= MT_TX_HW_QUEUE_EXT_PHY;
q = dev->q_tx[qid].q;
spin_lock_bh(&q->lock);
dev->queue_ops->tx_queue_skb(dev, qid, skb, wcid, sta);
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, bool ps)
{
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 = skb_dequeue(&mtxq->retry_q);
if (skb) {
u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
if (ps && skb_queue_empty(&mtxq->retry_q))
ieee80211_sta_set_buffered(txq->sta, tid, false);
return 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);
dev->queue_ops->tx_queue_skb(dev, MT_TXQ_PSD, skb, wcid, sta);
}
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].q;
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, true);
if (!skb)
break;
if (mtxq->aggr)
mt76_check_agg_ssn(mtxq, skb);
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_sw_queue *sq,
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 mt76_queue *hwq = sq->q;
struct ieee80211_tx_info *info;
struct sk_buff *skb;
int n_frames = 1, limit;
struct ieee80211_tx_rate tx_rate;
bool ampdu;
bool probe;
int idx;
if (test_bit(MT_WCID_FLAG_PS, &wcid->flags))
return 0;
skb = mt76_txq_dequeue(phy, mtxq, false);
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);
tx_rate = info->control.rates[0];
probe = (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE);
ampdu = IEEE80211_SKB_CB(skb)->flags & IEEE80211_TX_CTL_AMPDU;
limit = ampdu ? 16 : 3;
if (ampdu)
mt76_check_agg_ssn(mtxq, skb);
idx = dev->queue_ops->tx_queue_skb(dev, qid, skb, wcid, txq->sta);
if (idx < 0)
return idx;
do {
bool cur_ampdu;
if (probe)
break;
if (test_bit(MT76_RESET, &phy->state))
return -EBUSY;
skb = mt76_txq_dequeue(phy, mtxq, false);
if (!skb)
break;
info = IEEE80211_SKB_CB(skb);
cur_ampdu = info->flags & IEEE80211_TX_CTL_AMPDU;
if (ampdu != cur_ampdu ||
(info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE)) {
skb_queue_tail(&mtxq->retry_q, skb);
break;
}
info->control.rates[0] = tx_rate;
if (cur_ampdu)
mt76_check_agg_ssn(mtxq, skb);
idx = dev->queue_ops->tx_queue_skb(dev, qid, skb, wcid,
txq->sta);
if (idx < 0)
return idx;
n_frames++;
} while (n_frames < limit);
if (!probe) {
hwq->entry[idx].qid = sq - dev->q_tx;
hwq->entry[idx].schedule = true;
sq->swq_queued++;
}
dev->queue_ops->kick(dev, hwq);
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_sw_queue *sq = &dev->q_tx[qid];
struct mt76_queue *hwq = sq->q;
struct ieee80211_txq *txq;
struct mt76_txq *mtxq;
struct mt76_wcid *wcid;
int ret = 0;
spin_lock_bh(&hwq->lock);
while (1) {
if (sq->swq_queued >= 4)
break;
if (test_bit(MT76_RESET, &phy->state)) {
ret = -EBUSY;
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(&hwq->lock);
ieee80211_send_bar(vif, sta->addr, tid, agg_ssn);
spin_lock_bh(&hwq->lock);
}
ret += mt76_txq_send_burst(phy, sq, mtxq);
ieee80211_return_txq(phy->hw, txq,
!skb_queue_empty(&mtxq->retry_q));
}
spin_unlock_bh(&hwq->lock);
return ret;
}
void mt76_txq_schedule(struct mt76_phy *phy, enum mt76_txq_id qid)
{
struct mt76_dev *dev = phy->dev;
struct mt76_sw_queue *sq = &dev->q_tx[qid];
int len;
if (qid >= 4)
return;
if (sq->swq_queued >= 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_tasklet(unsigned long data)
{
struct mt76_dev *dev = (struct mt76_dev *)data;
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;
mtxq = (struct mt76_txq *)txq->drv_priv;
hwq = mtxq->swq->q;
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;
tasklet_schedule(&dev->tx_tasklet);
}
EXPORT_SYMBOL_GPL(mt76_wake_tx_queue);
void mt76_txq_remove(struct mt76_dev *dev, struct ieee80211_txq *txq)
{
struct ieee80211_hw *hw;
struct mt76_txq *mtxq;
struct sk_buff *skb;
if (!txq)
return;
mtxq = (struct mt76_txq *)txq->drv_priv;
while ((skb = skb_dequeue(&mtxq->retry_q)) != NULL) {
hw = mt76_tx_status_get_hw(dev, skb);
ieee80211_free_txskb(hw, skb);
}
}
EXPORT_SYMBOL_GPL(mt76_txq_remove);
void mt76_txq_init(struct mt76_dev *dev, struct ieee80211_txq *txq)
{
struct mt76_txq *mtxq = (struct mt76_txq *)txq->drv_priv;
skb_queue_head_init(&mtxq->retry_q);
mtxq->swq = &dev->q_tx[mt76_txq_get_qid(txq)];
}
EXPORT_SYMBOL_GPL(mt76_txq_init);
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)
{
struct sk_buff *iter, *last = skb;
u32 pad;
/* Add zero pad of 4 - 7 bytes */
pad = round_up(skb->len, 4) + 4 - skb->len;
/* 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);