/*
* Copyright (C) 2014 Felix Fietkau <nbd@openwrt.org>
* Copyright (C) 2015 Jakub Kicinski <kubakici@wp.pl>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include "mt76x0.h"
#include "trace.h"
/* Take mac80211 Q id from the skb and translate it to hardware Q id */
static u8 skb2q(struct sk_buff *skb)
{
int qid = skb_get_queue_mapping(skb);
if (WARN_ON(qid >= MT_TXQ_PSD)) {
qid = MT_TXQ_BE;
skb_set_queue_mapping(skb, qid);
}
return mt76_ac_to_hwq(qid);
}
static void mt76x0_tx_skb_remove_dma_overhead(struct sk_buff *skb,
struct ieee80211_tx_info *info)
{
int pkt_len = (unsigned long)info->status.status_driver_data[0];
skb_pull(skb, sizeof(struct mt76x02_txwi) + 4);
if (ieee80211_get_hdrlen_from_skb(skb) % 4)
mt76x0_remove_hdr_pad(skb);
skb_trim(skb, pkt_len);
}
void mt76x0_tx_status(struct mt76x0_dev *dev, struct sk_buff *skb)
{
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
mt76x0_tx_skb_remove_dma_overhead(skb, info);
ieee80211_tx_info_clear_status(info);
info->status.rates[0].idx = -1;
info->flags |= IEEE80211_TX_STAT_ACK;
spin_lock(&dev->mac_lock);
ieee80211_tx_status(dev->mt76.hw, skb);
spin_unlock(&dev->mac_lock);
}
static int mt76x0_skb_rooms(struct mt76x0_dev *dev, struct sk_buff *skb)
{
int hdr_len = ieee80211_get_hdrlen_from_skb(skb);
u32 need_head;
need_head = sizeof(struct mt76x02_txwi) + 4;
if (hdr_len % 4)
need_head += 2;
return skb_cow(skb, need_head);
}
static struct mt76x02_txwi *
mt76x0_push_txwi(struct mt76x0_dev *dev, struct sk_buff *skb,
struct ieee80211_sta *sta, struct mt76_wcid *wcid,
int pkt_len)
{
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
struct ieee80211_tx_rate *rate = &info->control.rates[0];
struct mt76x02_txwi *txwi;
unsigned long flags;
u16 txwi_flags = 0;
u32 pkt_id;
u16 rate_ctl;
u8 nss;
txwi = (struct mt76x02_txwi *)skb_push(skb, sizeof(struct mt76x02_txwi));
memset(txwi, 0, sizeof(*txwi));
if (!wcid->tx_rate_set)
ieee80211_get_tx_rates(info->control.vif, sta, skb,
info->control.rates, 1);
spin_lock_irqsave(&dev->mt76.lock, flags);
if (rate->idx < 0 || !rate->count) {
rate_ctl = wcid->tx_rate;
nss = wcid->tx_rate_nss;
} else {
rate_ctl = mt76x02_mac_tx_rate_val(&dev->mt76, rate, &nss);
}
spin_unlock_irqrestore(&dev->mt76.lock, flags);
txwi->rate = cpu_to_le16(rate_ctl);
if (info->flags & IEEE80211_TX_CTL_LDPC)
txwi->rate |= cpu_to_le16(MT_RXWI_RATE_LDPC);
if ((info->flags & IEEE80211_TX_CTL_STBC) && nss == 1)
txwi->rate |= cpu_to_le16(MT_RXWI_RATE_STBC);
if (nss > 1 && sta && sta->smps_mode == IEEE80211_SMPS_DYNAMIC)
txwi_flags |= MT_TXWI_FLAGS_MMPS;
if (!(info->flags & IEEE80211_TX_CTL_NO_ACK)) {
txwi->ack_ctl |= MT_TXWI_ACK_CTL_REQ;
pkt_id = 1;
} else {
pkt_id = 0;
}
if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE)
pkt_id |= MT_TXWI_PKTID_PROBE;
if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ)
txwi->ack_ctl |= MT_TXWI_ACK_CTL_NSEQ;
if ((info->flags & IEEE80211_TX_CTL_AMPDU) && sta) {
u8 ba_size = IEEE80211_MIN_AMPDU_BUF;
ba_size <<= sta->ht_cap.ampdu_factor;
ba_size = min_t(int, 7, ba_size - 1);
if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) {
ba_size = 0;
} else {
txwi_flags |= MT_TXWI_FLAGS_AMPDU;
txwi_flags |= FIELD_PREP(MT_TXWI_FLAGS_MPDU_DENSITY,
sta->ht_cap.ampdu_density);
}
txwi->ack_ctl |= FIELD_PREP(MT_TXWI_ACK_CTL_BA_WINDOW, ba_size);
}
txwi->wcid = wcid->idx;
txwi->flags |= cpu_to_le16(txwi_flags);
txwi->len_ctl = cpu_to_le16(pkt_len);
txwi->pktid = pkt_id;
return txwi;
}
void mt76x0_tx(struct ieee80211_hw *hw, struct ieee80211_tx_control *control,
struct sk_buff *skb)
{
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
struct mt76x0_dev *dev = hw->priv;
struct ieee80211_vif *vif = info->control.vif;
struct ieee80211_sta *sta = control->sta;
struct mt76x02_sta *msta = NULL;
struct mt76_wcid *wcid = &dev->mt76.global_wcid;
struct mt76x02_txwi *txwi;
int pkt_len = skb->len;
int hw_q = skb2q(skb);
BUILD_BUG_ON(ARRAY_SIZE(info->status.status_driver_data) < 1);
info->status.status_driver_data[0] = (void *)(unsigned long)pkt_len;
if (mt76x0_skb_rooms(dev, skb) || mt76x0_insert_hdr_pad(skb)) {
ieee80211_free_txskb(dev->mt76.hw, skb);
return;
}
if (sta) {
msta = (struct mt76x02_sta *) sta->drv_priv;
wcid = &msta->wcid;
} else if (vif && (!info->control.hw_key && wcid->hw_key_idx != 0xff)) {
struct mt76x02_vif *mvif = (struct mt76x02_vif *)vif->drv_priv;
wcid = &mvif->group_wcid;
}
txwi = mt76x0_push_txwi(dev, skb, sta, wcid, pkt_len);
if (mt76x0_dma_enqueue_tx(dev, skb, wcid, hw_q))
return;
trace_mt76x0_tx(&dev->mt76, skb, msta, txwi);
}
void mt76x0_tx_stat(struct work_struct *work)
{
struct mt76x0_dev *dev = container_of(work, struct mt76x0_dev,
stat_work.work);
struct mt76x02_tx_status stat;
unsigned long flags;
int cleaned = 0;
u8 update = 1;
while (!test_bit(MT76_REMOVED, &dev->mt76.state)) {
if (!mt76x02_mac_load_tx_status(&dev->mt76, &stat))
break;
mt76x02_send_tx_status(&dev->mt76, &stat, &update);
cleaned++;
}
trace_mt76x0_tx_status_cleaned(&dev->mt76, cleaned);
spin_lock_irqsave(&dev->tx_lock, flags);
if (cleaned)
queue_delayed_work(dev->stat_wq, &dev->stat_work,
msecs_to_jiffies(10));
else if (test_and_clear_bit(MT76_MORE_STATS, &dev->mt76.state))
queue_delayed_work(dev->stat_wq, &dev->stat_work,
msecs_to_jiffies(20));
else
clear_bit(MT76_READING_STATS, &dev->mt76.state);
spin_unlock_irqrestore(&dev->tx_lock, flags);
}
