blob: 227e5ebfe3dc2c1bd0f146bb88387d1d4554b02e [file] [log] [blame]
/*
* Copyright (C) 2016 Felix Fietkau <nbd@nbd.name>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "mt76.h"
static struct mt76_txwi_cache *
mt76_alloc_txwi(struct mt76_dev *dev)
{
struct mt76_txwi_cache *t;
dma_addr_t addr;
int size;
size = (sizeof(*t) + L1_CACHE_BYTES - 1) & ~(L1_CACHE_BYTES - 1);
t = devm_kzalloc(dev->dev, size, GFP_ATOMIC);
if (!t)
return NULL;
addr = dma_map_single(dev->dev, &t->txwi, sizeof(t->txwi),
DMA_TO_DEVICE);
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);
}
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, sizeof(t->txwi),
DMA_TO_DEVICE);
}
static int
mt76_txq_get_qid(struct ieee80211_txq *txq)
{
if (!txq->sta)
return MT_TXQ_BE;
return txq->ac;
}
void
mt76_tx(struct mt76_dev *dev, struct ieee80211_sta *sta,
struct mt76_wcid *wcid, struct sk_buff *skb)
{
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
struct mt76_queue *q;
int qid = skb_get_queue_mapping(skb);
if (WARN_ON(qid >= MT_TXQ_PSD)) {
qid = MT_TXQ_BE;
skb_set_queue_mapping(skb, qid);
}
if (!wcid->tx_rate_set)
ieee80211_get_tx_rates(info->control.vif, sta, skb,
info->control.rates, 1);
q = &dev->q_tx[qid];
spin_lock_bh(&q->lock);
dev->queue_ops->tx_queue_skb(dev, q, skb, wcid, sta);
dev->queue_ops->kick(dev, q);
if (q->queued > q->ndesc - 8)
ieee80211_stop_queue(dev->hw, skb_get_queue_mapping(skb));
spin_unlock_bh(&q->lock);
}
EXPORT_SYMBOL_GPL(mt76_tx);
static struct sk_buff *
mt76_txq_dequeue(struct mt76_dev *dev, struct mt76_txq *mtxq, bool ps)
{
struct ieee80211_txq *txq = mtxq_to_txq(mtxq);
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(dev->hw, txq);
if (!skb)
return NULL;
return skb;
}
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;
}
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);
struct mt76_queue *hwq = &dev->q_tx[MT_TXQ_PSD];
info->control.flags |= IEEE80211_TX_CTRL_PS_RESPONSE;
if (last)
info->flags |= IEEE80211_TX_STATUS_EOSP;
mt76_skb_set_moredata(skb, !last);
dev->queue_ops->tx_queue_skb(dev, hwq, 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_dev *dev = hw->priv;
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(dev, 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);
}
spin_unlock_bh(&hwq->lock);
}
EXPORT_SYMBOL_GPL(mt76_release_buffered_frames);
static int
mt76_txq_send_burst(struct mt76_dev *dev, struct mt76_queue *hwq,
struct mt76_txq *mtxq, bool *empty)
{
struct ieee80211_txq *txq = mtxq_to_txq(mtxq);
struct ieee80211_tx_info *info;
struct mt76_wcid *wcid = mtxq->wcid;
struct sk_buff *skb;
int n_frames = 1, limit;
struct ieee80211_tx_rate tx_rate;
bool ampdu;
bool probe;
int idx;
skb = mt76_txq_dequeue(dev, mtxq, false);
if (!skb) {
*empty = true;
return 0;
}
info = IEEE80211_SKB_CB(skb);
if (!wcid->tx_rate_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, hwq, skb, wcid, txq->sta);
if (idx < 0)
return idx;
do {
bool cur_ampdu;
if (probe)
break;
if (test_bit(MT76_OFFCHANNEL, &dev->state) ||
test_bit(MT76_RESET, &dev->state))
return -EBUSY;
skb = mt76_txq_dequeue(dev, mtxq, false);
if (!skb) {
*empty = true;
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, hwq, skb, wcid,
txq->sta);
if (idx < 0)
return idx;
n_frames++;
} while (n_frames < limit);
if (!probe) {
hwq->swq_queued++;
hwq->entry[idx].schedule = true;
}
dev->queue_ops->kick(dev, hwq);
return n_frames;
}
static int
mt76_txq_schedule_list(struct mt76_dev *dev, struct mt76_queue *hwq)
{
struct mt76_txq *mtxq, *mtxq_last;
int len = 0;
restart:
mtxq_last = list_last_entry(&hwq->swq, struct mt76_txq, list);
while (!list_empty(&hwq->swq)) {
bool empty = false;
int cur;
if (test_bit(MT76_OFFCHANNEL, &dev->state) ||
test_bit(MT76_RESET, &dev->state))
return -EBUSY;
mtxq = list_first_entry(&hwq->swq, struct mt76_txq, list);
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);
goto restart;
}
list_del_init(&mtxq->list);
cur = mt76_txq_send_burst(dev, hwq, mtxq, &empty);
if (!empty)
list_add_tail(&mtxq->list, &hwq->swq);
if (cur < 0)
return cur;
len += cur;
if (mtxq == mtxq_last)
break;
}
return len;
}
void mt76_txq_schedule(struct mt76_dev *dev, struct mt76_queue *hwq)
{
int len;
rcu_read_lock();
do {
if (hwq->swq_queued >= 4 || list_empty(&hwq->swq))
break;
len = mt76_txq_schedule_list(dev, hwq);
} while (len > 0);
rcu_read_unlock();
}
EXPORT_SYMBOL_GPL(mt76_txq_schedule);
void mt76_txq_schedule_all(struct mt76_dev *dev)
{
int i;
for (i = 0; i <= MT_TXQ_BK; i++) {
struct mt76_queue *q = &dev->q_tx[i];
spin_lock_bh(&q->lock);
mt76_txq_schedule(dev, q);
spin_unlock_bh(&q->lock);
}
}
EXPORT_SYMBOL_GPL(mt76_txq_schedule_all);
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_txq *mtxq;
if (!txq)
continue;
mtxq = (struct mt76_txq *)txq->drv_priv;
spin_lock_bh(&mtxq->hwq->lock);
mtxq->send_bar = mtxq->aggr && send_bar;
if (!list_empty(&mtxq->list))
list_del_init(&mtxq->list);
spin_unlock_bh(&mtxq->hwq->lock);
}
}
EXPORT_SYMBOL_GPL(mt76_stop_tx_queues);
void mt76_wake_tx_queue(struct ieee80211_hw *hw, struct ieee80211_txq *txq)
{
struct mt76_dev *dev = hw->priv;
struct mt76_txq *mtxq = (struct mt76_txq *) txq->drv_priv;
struct mt76_queue *hwq = mtxq->hwq;
spin_lock_bh(&hwq->lock);
if (list_empty(&mtxq->list))
list_add_tail(&mtxq->list, &hwq->swq);
mt76_txq_schedule(dev, hwq);
spin_unlock_bh(&hwq->lock);
}
EXPORT_SYMBOL_GPL(mt76_wake_tx_queue);
void mt76_txq_remove(struct mt76_dev *dev, struct ieee80211_txq *txq)
{
struct mt76_txq *mtxq;
struct mt76_queue *hwq;
struct sk_buff *skb;
if (!txq)
return;
mtxq = (struct mt76_txq *) txq->drv_priv;
hwq = mtxq->hwq;
spin_lock_bh(&hwq->lock);
if (!list_empty(&mtxq->list))
list_del(&mtxq->list);
spin_unlock_bh(&hwq->lock);
while ((skb = skb_dequeue(&mtxq->retry_q)) != NULL)
ieee80211_free_txskb(dev->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;
INIT_LIST_HEAD(&mtxq->list);
skb_queue_head_init(&mtxq->retry_q);
mtxq->hwq = &dev->q_tx[mt76_txq_get_qid(txq)];
}
EXPORT_SYMBOL_GPL(mt76_txq_init);