1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2014 Felix Fietkau <nbd@openwrt.org> 4 * Copyright (C) 2015 Jakub Kicinski <kubakici@wp.pl> 5 */ 6 7 #include "mt7601u.h" 8 #include "trace.h" 9 10 enum mt76_txq_id { 11 MT_TXQ_VO = IEEE80211_AC_VO, 12 MT_TXQ_VI = IEEE80211_AC_VI, 13 MT_TXQ_BE = IEEE80211_AC_BE, 14 MT_TXQ_BK = IEEE80211_AC_BK, 15 MT_TXQ_PSD, 16 MT_TXQ_MCU, 17 __MT_TXQ_MAX 18 }; 19 20 /* Hardware uses mirrored order of queues with Q0 having the highest priority */ 21 static u8 q2hwq(u8 q) 22 { 23 return q ^ 0x3; 24 } 25 26 /* Take mac80211 Q id from the skb and translate it to hardware Q id */ 27 static u8 skb2q(struct sk_buff *skb) 28 { 29 int qid = skb_get_queue_mapping(skb); 30 31 if (WARN_ON(qid >= MT_TXQ_PSD)) { 32 qid = MT_TXQ_BE; 33 skb_set_queue_mapping(skb, qid); 34 } 35 36 return q2hwq(qid); 37 } 38 39 /* Note: TX retry reporting is a bit broken. 40 * Retries are reported only once per AMPDU and often come a frame early 41 * i.e. they are reported in the last status preceding the AMPDU. Apart 42 * from the fact that it's hard to know the length of the AMPDU (which is 43 * required to know to how many consecutive frames retries should be 44 * applied), if status comes early on full FIFO it gets lost and retries 45 * of the whole AMPDU become invisible. 46 * As a work-around encode the desired rate in PKT_ID of TX descriptor 47 * and based on that guess the retries (every rate is tried once). 48 * Only downside here is that for MCS0 we have to rely solely on 49 * transmission failures as no retries can ever be reported. 50 * Not having to read EXT_FIFO has a nice effect of doubling the number 51 * of reports which can be fetched. 52 * Also the vendor driver never uses the EXT_FIFO register so it may be 53 * undertested. 54 */ 55 static u8 mt7601u_tx_pktid_enc(struct mt7601u_dev *dev, u8 rate, bool is_probe) 56 { 57 u8 encoded = (rate + 1) + is_probe * 8; 58 59 /* Because PKT_ID 0 disables status reporting only 15 values are 60 * available but 16 are needed (8 MCS * 2 for encoding is_probe) 61 * - we need to cram together two rates. MCS0 and MCS7 with is_probe 62 * share PKT_ID 9. 63 */ 64 if (is_probe && rate == 7) 65 return encoded - 7; 66 67 return encoded; 68 } 69 70 static void 71 mt7601u_tx_pktid_dec(struct mt7601u_dev *dev, struct mt76_tx_status *stat) 72 { 73 u8 req_rate = stat->pktid; 74 u8 eff_rate = stat->rate & 0x7; 75 76 req_rate -= 1; 77 78 if (req_rate > 7) { 79 stat->is_probe = true; 80 req_rate -= 8; 81 82 /* Decide between MCS0 and MCS7 which share pktid 9 */ 83 if (!req_rate && eff_rate) 84 req_rate = 7; 85 } 86 87 stat->retry = req_rate - eff_rate; 88 } 89 90 static void mt7601u_tx_skb_remove_dma_overhead(struct sk_buff *skb, 91 struct ieee80211_tx_info *info) 92 { 93 int pkt_len = (unsigned long)info->status.status_driver_data[0]; 94 95 skb_pull(skb, sizeof(struct mt76_txwi) + 4); 96 if (ieee80211_get_hdrlen_from_skb(skb) % 4) 97 mt76_remove_hdr_pad(skb); 98 99 skb_trim(skb, pkt_len); 100 } 101 102 void mt7601u_tx_status(struct mt7601u_dev *dev, struct sk_buff *skb) 103 { 104 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 105 106 mt7601u_tx_skb_remove_dma_overhead(skb, info); 107 108 ieee80211_tx_info_clear_status(info); 109 info->status.rates[0].idx = -1; 110 info->flags |= IEEE80211_TX_STAT_ACK; 111 112 spin_lock(&dev->mac_lock); 113 ieee80211_tx_status(dev->hw, skb); 114 spin_unlock(&dev->mac_lock); 115 } 116 117 static int mt7601u_skb_rooms(struct mt7601u_dev *dev, struct sk_buff *skb) 118 { 119 int hdr_len = ieee80211_get_hdrlen_from_skb(skb); 120 u32 need_head; 121 122 need_head = sizeof(struct mt76_txwi) + 4; 123 if (hdr_len % 4) 124 need_head += 2; 125 126 return skb_cow(skb, need_head); 127 } 128 129 static struct mt76_txwi * 130 mt7601u_push_txwi(struct mt7601u_dev *dev, struct sk_buff *skb, 131 struct ieee80211_sta *sta, struct mt76_wcid *wcid, 132 int pkt_len) 133 { 134 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 135 struct ieee80211_tx_rate *rate = &info->control.rates[0]; 136 struct mt76_txwi *txwi; 137 unsigned long flags; 138 bool is_probe; 139 u32 pkt_id; 140 u16 rate_ctl; 141 u8 nss; 142 143 txwi = skb_push(skb, sizeof(struct mt76_txwi)); 144 memset(txwi, 0, sizeof(*txwi)); 145 146 if (!wcid->tx_rate_set) 147 ieee80211_get_tx_rates(info->control.vif, sta, skb, 148 info->control.rates, 1); 149 150 spin_lock_irqsave(&dev->lock, flags); 151 if (rate->idx < 0 || !rate->count) 152 rate_ctl = wcid->tx_rate; 153 else 154 rate_ctl = mt76_mac_tx_rate_val(dev, rate, &nss); 155 spin_unlock_irqrestore(&dev->lock, flags); 156 txwi->rate_ctl = cpu_to_le16(rate_ctl); 157 158 if (!(info->flags & IEEE80211_TX_CTL_NO_ACK)) 159 txwi->ack_ctl |= MT_TXWI_ACK_CTL_REQ; 160 if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) 161 txwi->ack_ctl |= MT_TXWI_ACK_CTL_NSEQ; 162 163 if ((info->flags & IEEE80211_TX_CTL_AMPDU) && sta) { 164 u8 ba_size = IEEE80211_MIN_AMPDU_BUF; 165 166 ba_size <<= sta->ht_cap.ampdu_factor; 167 ba_size = min_t(int, 63, ba_size); 168 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) 169 ba_size = 0; 170 txwi->ack_ctl |= FIELD_PREP(MT_TXWI_ACK_CTL_BA_WINDOW, ba_size); 171 172 txwi->flags = 173 cpu_to_le16(MT_TXWI_FLAGS_AMPDU | 174 FIELD_PREP(MT_TXWI_FLAGS_MPDU_DENSITY, 175 sta->ht_cap.ampdu_density)); 176 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE) 177 txwi->flags = 0; 178 } 179 180 txwi->wcid = wcid->idx; 181 182 is_probe = !!(info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE); 183 pkt_id = mt7601u_tx_pktid_enc(dev, rate_ctl & 0x7, is_probe); 184 pkt_len |= FIELD_PREP(MT_TXWI_LEN_PKTID, pkt_id); 185 txwi->len_ctl = cpu_to_le16(pkt_len); 186 187 return txwi; 188 } 189 190 void mt7601u_tx(struct ieee80211_hw *hw, struct ieee80211_tx_control *control, 191 struct sk_buff *skb) 192 { 193 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 194 struct mt7601u_dev *dev = hw->priv; 195 struct ieee80211_vif *vif = info->control.vif; 196 struct ieee80211_sta *sta = control->sta; 197 struct mt76_sta *msta = NULL; 198 struct mt76_wcid *wcid = dev->mon_wcid; 199 struct mt76_txwi *txwi; 200 int pkt_len = skb->len; 201 int hw_q = skb2q(skb); 202 203 BUILD_BUG_ON(ARRAY_SIZE(info->status.status_driver_data) < 1); 204 info->status.status_driver_data[0] = (void *)(unsigned long)pkt_len; 205 206 if (mt7601u_skb_rooms(dev, skb) || mt76_insert_hdr_pad(skb)) { 207 ieee80211_free_txskb(dev->hw, skb); 208 return; 209 } 210 211 if (sta) { 212 msta = (struct mt76_sta *) sta->drv_priv; 213 wcid = &msta->wcid; 214 } else if (vif) { 215 struct mt76_vif *mvif = (struct mt76_vif *)vif->drv_priv; 216 217 wcid = &mvif->group_wcid; 218 } 219 220 txwi = mt7601u_push_txwi(dev, skb, sta, wcid, pkt_len); 221 222 if (mt7601u_dma_enqueue_tx(dev, skb, wcid, hw_q)) 223 return; 224 225 trace_mt_tx(dev, skb, msta, txwi); 226 } 227 228 void mt7601u_tx_stat(struct work_struct *work) 229 { 230 struct mt7601u_dev *dev = container_of(work, struct mt7601u_dev, 231 stat_work.work); 232 struct mt76_tx_status stat; 233 unsigned long flags; 234 int cleaned = 0; 235 236 while (!test_bit(MT7601U_STATE_REMOVED, &dev->state)) { 237 stat = mt7601u_mac_fetch_tx_status(dev); 238 if (!stat.valid) 239 break; 240 241 mt7601u_tx_pktid_dec(dev, &stat); 242 mt76_send_tx_status(dev, &stat); 243 244 cleaned++; 245 } 246 trace_mt_tx_status_cleaned(dev, cleaned); 247 248 spin_lock_irqsave(&dev->tx_lock, flags); 249 if (cleaned) 250 queue_delayed_work(dev->stat_wq, &dev->stat_work, 251 msecs_to_jiffies(10)); 252 else if (test_and_clear_bit(MT7601U_STATE_MORE_STATS, &dev->state)) 253 queue_delayed_work(dev->stat_wq, &dev->stat_work, 254 msecs_to_jiffies(20)); 255 else 256 clear_bit(MT7601U_STATE_READING_STATS, &dev->state); 257 spin_unlock_irqrestore(&dev->tx_lock, flags); 258 } 259 260 int mt7601u_conf_tx(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 261 u16 queue, const struct ieee80211_tx_queue_params *params) 262 { 263 struct mt7601u_dev *dev = hw->priv; 264 u8 cw_min = 5, cw_max = 10, hw_q = q2hwq(queue); 265 u32 val; 266 267 /* TODO: should we do funny things with the parameters? 268 * See what mt7601u_set_default_edca() used to do in init.c. 269 */ 270 271 if (params->cw_min) 272 cw_min = fls(params->cw_min); 273 if (params->cw_max) 274 cw_max = fls(params->cw_max); 275 276 WARN_ON(params->txop > 0xff); 277 WARN_ON(params->aifs > 0xf); 278 WARN_ON(cw_min > 0xf); 279 WARN_ON(cw_max > 0xf); 280 281 val = FIELD_PREP(MT_EDCA_CFG_AIFSN, params->aifs) | 282 FIELD_PREP(MT_EDCA_CFG_CWMIN, cw_min) | 283 FIELD_PREP(MT_EDCA_CFG_CWMAX, cw_max); 284 /* TODO: based on user-controlled EnableTxBurst var vendor drv sets 285 * a really long txop on AC0 (see connect.c:2009) but only on 286 * connect? When not connected should be 0. 287 */ 288 if (!hw_q) 289 val |= 0x60; 290 else 291 val |= FIELD_PREP(MT_EDCA_CFG_TXOP, params->txop); 292 mt76_wr(dev, MT_EDCA_CFG_AC(hw_q), val); 293 294 val = mt76_rr(dev, MT_WMM_TXOP(hw_q)); 295 val &= ~(MT_WMM_TXOP_MASK << MT_WMM_TXOP_SHIFT(hw_q)); 296 val |= params->txop << MT_WMM_TXOP_SHIFT(hw_q); 297 mt76_wr(dev, MT_WMM_TXOP(hw_q), val); 298 299 val = mt76_rr(dev, MT_WMM_AIFSN); 300 val &= ~(MT_WMM_AIFSN_MASK << MT_WMM_AIFSN_SHIFT(hw_q)); 301 val |= params->aifs << MT_WMM_AIFSN_SHIFT(hw_q); 302 mt76_wr(dev, MT_WMM_AIFSN, val); 303 304 val = mt76_rr(dev, MT_WMM_CWMIN); 305 val &= ~(MT_WMM_CWMIN_MASK << MT_WMM_CWMIN_SHIFT(hw_q)); 306 val |= cw_min << MT_WMM_CWMIN_SHIFT(hw_q); 307 mt76_wr(dev, MT_WMM_CWMIN, val); 308 309 val = mt76_rr(dev, MT_WMM_CWMAX); 310 val &= ~(MT_WMM_CWMAX_MASK << MT_WMM_CWMAX_SHIFT(hw_q)); 311 val |= cw_max << MT_WMM_CWMAX_SHIFT(hw_q); 312 mt76_wr(dev, MT_WMM_CWMAX, val); 313 314 return 0; 315 } 316