diff options
Diffstat (limited to 'drivers/net/wireless/mediatek/mt7601u/tx.c')
| -rw-r--r-- | drivers/net/wireless/mediatek/mt7601u/tx.c | 323 |
1 files changed, 323 insertions, 0 deletions
diff --git a/drivers/net/wireless/mediatek/mt7601u/tx.c b/drivers/net/wireless/mediatek/mt7601u/tx.c new file mode 100644 index 0000000..ad77bec --- /dev/null +++ b/drivers/net/wireless/mediatek/mt7601u/tx.c @@ -0,0 +1,323 @@ +/* + * 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 "mt7601u.h" +#include "trace.h" + +enum mt76_txq_id { + MT_TXQ_VO = IEEE80211_AC_VO, + MT_TXQ_VI = IEEE80211_AC_VI, + MT_TXQ_BE = IEEE80211_AC_BE, + MT_TXQ_BK = IEEE80211_AC_BK, + MT_TXQ_PSD, + MT_TXQ_MCU, + __MT_TXQ_MAX +}; + +/* Hardware uses mirrored order of queues with Q0 having the highest priority */ +static u8 q2hwq(u8 q) +{ + return q ^ 0x3; +} + +/* 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 q2hwq(qid); +} + +/* Note: TX retry reporting is a bit broken. + * Retries are reported only once per AMPDU and often come a frame early + * i.e. they are reported in the last status preceding the AMPDU. Apart + * from the fact that it's hard to know the length of the AMPDU (which is + * required to know to how many consecutive frames retries should be + * applied), if status comes early on full FIFO it gets lost and retries + * of the whole AMPDU become invisible. + * As a work-around encode the desired rate in PKT_ID of TX descriptor + * and based on that guess the retries (every rate is tried once). + * Only downside here is that for MCS0 we have to rely solely on + * transmission failures as no retries can ever be reported. + * Not having to read EXT_FIFO has a nice effect of doubling the number + * of reports which can be fetched. + * Also the vendor driver never uses the EXT_FIFO register so it may be + * undertested. + */ +static u8 mt7601u_tx_pktid_enc(struct mt7601u_dev *dev, u8 rate, bool is_probe) +{ + u8 encoded = (rate + 1) + is_probe * 8; + + /* Because PKT_ID 0 disables status reporting only 15 values are + * available but 16 are needed (8 MCS * 2 for encoding is_probe) + * - we need to cram together two rates. MCS0 and MCS7 with is_probe + * share PKT_ID 9. + */ + if (is_probe && rate == 7) + return encoded - 7; + + return encoded; +} + +static void +mt7601u_tx_pktid_dec(struct mt7601u_dev *dev, struct mt76_tx_status *stat) +{ + u8 req_rate = stat->pktid; + u8 eff_rate = stat->rate & 0x7; + + req_rate -= 1; + + if (req_rate > 7) { + stat->is_probe = true; + req_rate -= 8; + + /* Decide between MCS0 and MCS7 which share pktid 9 */ + if (!req_rate && eff_rate) + req_rate = 7; + } + + stat->retry = req_rate - eff_rate; +} + +static void mt7601u_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 mt76_txwi) + 4); + if (ieee80211_get_hdrlen_from_skb(skb) % 4) + mt76_remove_hdr_pad(skb); + + skb_trim(skb, pkt_len); +} + +void mt7601u_tx_status(struct mt7601u_dev *dev, struct sk_buff *skb) +{ + struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); + + mt7601u_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->hw, skb); + spin_unlock(&dev->mac_lock); +} + +static int mt7601u_skb_rooms(struct mt7601u_dev *dev, struct sk_buff *skb) +{ + int hdr_len = ieee80211_get_hdrlen_from_skb(skb); + u32 need_head; + + need_head = sizeof(struct mt76_txwi) + 4; + if (hdr_len % 4) + need_head += 2; + + return skb_cow(skb, need_head); +} + +static struct mt76_txwi * +mt7601u_push_txwi(struct mt7601u_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 mt76_txwi *txwi; + unsigned long flags; + bool is_probe; + u32 pkt_id; + u16 rate_ctl; + u8 nss; + + txwi = (struct mt76_txwi *)skb_push(skb, sizeof(struct mt76_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->lock, flags); + if (rate->idx < 0 || !rate->count) + rate_ctl = wcid->tx_rate; + else + rate_ctl = mt76_mac_tx_rate_val(dev, rate, &nss); + spin_unlock_irqrestore(&dev->lock, flags); + txwi->rate_ctl = cpu_to_le16(rate_ctl); + + if (!(info->flags & IEEE80211_TX_CTL_NO_ACK)) + txwi->ack_ctl |= MT_TXWI_ACK_CTL_REQ; + 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, 63, ba_size); + if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) + ba_size = 0; + txwi->ack_ctl |= FIELD_PREP(MT_TXWI_ACK_CTL_BA_WINDOW, ba_size); + + txwi->flags = + cpu_to_le16(MT_TXWI_FLAGS_AMPDU | + FIELD_PREP(MT_TXWI_FLAGS_MPDU_DENSITY, + sta->ht_cap.ampdu_density)); + if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) + txwi->flags = 0; + } + + txwi->wcid = wcid->idx; + + is_probe = !!(info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE); + pkt_id = mt7601u_tx_pktid_enc(dev, rate_ctl & 0x7, is_probe); + pkt_len |= FIELD_PREP(MT_TXWI_LEN_PKTID, pkt_id); + txwi->len_ctl = cpu_to_le16(pkt_len); + + return txwi; +} + +void mt7601u_tx(struct ieee80211_hw *hw, struct ieee80211_tx_control *control, + struct sk_buff *skb) +{ + struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); + struct mt7601u_dev *dev = hw->priv; + struct ieee80211_vif *vif = info->control.vif; + struct ieee80211_sta *sta = control->sta; + struct mt76_sta *msta = NULL; + struct mt76_wcid *wcid = dev->mon_wcid; + struct mt76_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 (mt7601u_skb_rooms(dev, skb) || mt76_insert_hdr_pad(skb)) { + ieee80211_free_txskb(dev->hw, skb); + return; + } + + if (sta) { + msta = (struct mt76_sta *) sta->drv_priv; + wcid = &msta->wcid; + } else if (vif) { + struct mt76_vif *mvif = (struct mt76_vif *)vif->drv_priv; + + wcid = &mvif->group_wcid; + } + + txwi = mt7601u_push_txwi(dev, skb, sta, wcid, pkt_len); + + if (mt7601u_dma_enqueue_tx(dev, skb, wcid, hw_q)) + return; + + trace_mt_tx(dev, skb, msta, txwi); +} + +void mt7601u_tx_stat(struct work_struct *work) +{ + struct mt7601u_dev *dev = container_of(work, struct mt7601u_dev, + stat_work.work); + struct mt76_tx_status stat; + unsigned long flags; + int cleaned = 0; + + while (!test_bit(MT7601U_STATE_REMOVED, &dev->state)) { + stat = mt7601u_mac_fetch_tx_status(dev); + if (!stat.valid) + break; + + mt7601u_tx_pktid_dec(dev, &stat); + mt76_send_tx_status(dev, &stat); + + cleaned++; + } + trace_mt_tx_status_cleaned(dev, 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(MT7601U_STATE_MORE_STATS, &dev->state)) + queue_delayed_work(dev->stat_wq, &dev->stat_work, + msecs_to_jiffies(20)); + else + clear_bit(MT7601U_STATE_READING_STATS, &dev->state); + spin_unlock_irqrestore(&dev->tx_lock, flags); +} + +int mt7601u_conf_tx(struct ieee80211_hw *hw, struct ieee80211_vif *vif, + u16 queue, const struct ieee80211_tx_queue_params *params) +{ + struct mt7601u_dev *dev = hw->priv; + u8 cw_min = 5, cw_max = 10, hw_q = q2hwq(queue); + u32 val; + + /* TODO: should we do funny things with the parameters? + * See what mt7601u_set_default_edca() used to do in init.c. + */ + + if (params->cw_min) + cw_min = fls(params->cw_min); + if (params->cw_max) + cw_max = fls(params->cw_max); + + WARN_ON(params->txop > 0xff); + WARN_ON(params->aifs > 0xf); + WARN_ON(cw_min > 0xf); + WARN_ON(cw_max > 0xf); + + val = FIELD_PREP(MT_EDCA_CFG_AIFSN, params->aifs) | + FIELD_PREP(MT_EDCA_CFG_CWMIN, cw_min) | + FIELD_PREP(MT_EDCA_CFG_CWMAX, cw_max); + /* TODO: based on user-controlled EnableTxBurst var vendor drv sets + * a really long txop on AC0 (see connect.c:2009) but only on + * connect? When not connected should be 0. + */ + if (!hw_q) + val |= 0x60; + else + val |= FIELD_PREP(MT_EDCA_CFG_TXOP, params->txop); + mt76_wr(dev, MT_EDCA_CFG_AC(hw_q), val); + + val = mt76_rr(dev, MT_WMM_TXOP(hw_q)); + val &= ~(MT_WMM_TXOP_MASK << MT_WMM_TXOP_SHIFT(hw_q)); + val |= params->txop << MT_WMM_TXOP_SHIFT(hw_q); + mt76_wr(dev, MT_WMM_TXOP(hw_q), val); + + val = mt76_rr(dev, MT_WMM_AIFSN); + val &= ~(MT_WMM_AIFSN_MASK << MT_WMM_AIFSN_SHIFT(hw_q)); + val |= params->aifs << MT_WMM_AIFSN_SHIFT(hw_q); + mt76_wr(dev, MT_WMM_AIFSN, val); + + val = mt76_rr(dev, MT_WMM_CWMIN); + val &= ~(MT_WMM_CWMIN_MASK << MT_WMM_CWMIN_SHIFT(hw_q)); + val |= cw_min << MT_WMM_CWMIN_SHIFT(hw_q); + mt76_wr(dev, MT_WMM_CWMIN, val); + + val = mt76_rr(dev, MT_WMM_CWMAX); + val &= ~(MT_WMM_CWMAX_MASK << MT_WMM_CWMAX_SHIFT(hw_q)); + val |= cw_max << MT_WMM_CWMAX_SHIFT(hw_q); + mt76_wr(dev, MT_WMM_CWMAX, val); + + return 0; +} |