1 // SPDX-License-Identifier: ISC 2 /* 3 * Copyright (C) 2018 Lorenzo Bianconi <lorenzo.bianconi83@gmail.com> 4 */ 5 6 #include "mt76x02_usb.h" 7 8 static void mt76x02u_remove_dma_hdr(struct sk_buff *skb) 9 { 10 int hdr_len; 11 12 skb_pull(skb, sizeof(struct mt76x02_txwi) + MT_DMA_HDR_LEN); 13 hdr_len = ieee80211_get_hdrlen_from_skb(skb); 14 if (hdr_len % 4) 15 mt76x02_remove_hdr_pad(skb, 2); 16 } 17 18 void mt76x02u_tx_complete_skb(struct mt76_dev *mdev, enum mt76_txq_id qid, 19 struct mt76_queue_entry *e) 20 { 21 mt76x02u_remove_dma_hdr(e->skb); 22 mt76_tx_complete_skb(mdev, e->skb); 23 } 24 EXPORT_SYMBOL_GPL(mt76x02u_tx_complete_skb); 25 26 int mt76x02u_skb_dma_info(struct sk_buff *skb, int port, u32 flags) 27 { 28 struct sk_buff *iter, *last = skb; 29 u32 info, pad; 30 31 /* Buffer layout: 32 * | 4B | xfer len | pad | 4B | 33 * | TXINFO | pkt/cmd | zero pad to 4B | zero | 34 * 35 * length field of TXINFO should be set to 'xfer len'. 36 */ 37 info = FIELD_PREP(MT_TXD_INFO_LEN, round_up(skb->len, 4)) | 38 FIELD_PREP(MT_TXD_INFO_DPORT, port) | flags; 39 put_unaligned_le32(info, skb_push(skb, sizeof(info))); 40 41 /* Add zero pad of 4 - 7 bytes */ 42 pad = round_up(skb->len, 4) + 4 - skb->len; 43 44 /* First packet of a A-MSDU burst keeps track of the whole burst 45 * length, need to update length of it and the last packet. 46 */ 47 skb_walk_frags(skb, iter) { 48 last = iter; 49 if (!iter->next) { 50 skb->data_len += pad; 51 skb->len += pad; 52 break; 53 } 54 } 55 56 if (skb_pad(last, pad)) 57 return -ENOMEM; 58 __skb_put(last, pad); 59 60 return 0; 61 } 62 63 int mt76x02u_tx_prepare_skb(struct mt76_dev *mdev, void *data, 64 enum mt76_txq_id qid, struct mt76_wcid *wcid, 65 struct ieee80211_sta *sta, 66 struct mt76_tx_info *tx_info) 67 { 68 struct mt76x02_dev *dev = container_of(mdev, struct mt76x02_dev, mt76); 69 int pid, len = tx_info->skb->len, ep = q2ep(mdev->q_tx[qid].q->hw_idx); 70 struct mt76x02_txwi *txwi; 71 bool ampdu = IEEE80211_SKB_CB(tx_info->skb)->flags & IEEE80211_TX_CTL_AMPDU; 72 enum mt76_qsel qsel; 73 u32 flags; 74 75 mt76_insert_hdr_pad(tx_info->skb); 76 77 txwi = (struct mt76x02_txwi *)(tx_info->skb->data - sizeof(*txwi)); 78 mt76x02_mac_write_txwi(dev, txwi, tx_info->skb, wcid, sta, len); 79 skb_push(tx_info->skb, sizeof(*txwi)); 80 81 pid = mt76_tx_status_skb_add(mdev, wcid, tx_info->skb); 82 83 /* encode packet rate for no-skb packet id to fix up status reporting */ 84 if (pid == MT_PACKET_ID_NO_SKB) 85 pid = MT_PACKET_ID_HAS_RATE | 86 (le16_to_cpu(txwi->rate) & MT_RXWI_RATE_INDEX); 87 88 txwi->pktid = pid; 89 90 if ((mt76_is_skb_pktid(pid) && ampdu) || ep == MT_EP_OUT_HCCA) 91 qsel = MT_QSEL_MGMT; 92 else 93 qsel = MT_QSEL_EDCA; 94 95 flags = FIELD_PREP(MT_TXD_INFO_QSEL, qsel) | 96 MT_TXD_INFO_80211; 97 if (!wcid || wcid->hw_key_idx == 0xff || wcid->sw_iv) 98 flags |= MT_TXD_INFO_WIV; 99 100 return mt76x02u_skb_dma_info(tx_info->skb, WLAN_PORT, flags); 101 } 102 EXPORT_SYMBOL_GPL(mt76x02u_tx_prepare_skb); 103 104 /* Trigger pre-TBTT event 8 ms before TBTT */ 105 #define PRE_TBTT_USEC 8000 106 107 /* Beacon SRAM memory is limited to 8kB. We need to send PS buffered frames 108 * (which can be 1500 bytes big) via beacon memory. That make limit of number 109 * of slots to 5. TODO: dynamically calculate offsets in beacon SRAM. 110 */ 111 #define N_BCN_SLOTS 5 112 113 static void mt76x02u_start_pre_tbtt_timer(struct mt76x02_dev *dev) 114 { 115 u64 time; 116 u32 tbtt; 117 118 /* Get remaining TBTT in usec */ 119 tbtt = mt76_get_field(dev, MT_TBTT_TIMER, MT_TBTT_TIMER_VAL); 120 tbtt *= 32; 121 122 if (tbtt <= PRE_TBTT_USEC) { 123 queue_work(system_highpri_wq, &dev->pre_tbtt_work); 124 return; 125 } 126 127 time = (tbtt - PRE_TBTT_USEC) * 1000ull; 128 hrtimer_start(&dev->pre_tbtt_timer, time, HRTIMER_MODE_REL); 129 } 130 131 static void mt76x02u_restart_pre_tbtt_timer(struct mt76x02_dev *dev) 132 { 133 u32 tbtt, dw0, dw1; 134 u64 tsf, time; 135 136 /* Get remaining TBTT in usec */ 137 tbtt = mt76_get_field(dev, MT_TBTT_TIMER, MT_TBTT_TIMER_VAL); 138 tbtt *= 32; 139 140 dw0 = mt76_rr(dev, MT_TSF_TIMER_DW0); 141 dw1 = mt76_rr(dev, MT_TSF_TIMER_DW1); 142 tsf = (u64)dw0 << 32 | dw1; 143 dev_dbg(dev->mt76.dev, "TSF: %llu us TBTT %u us\n", tsf, tbtt); 144 145 /* Convert beacon interval in TU (1024 usec) to nsec */ 146 time = ((1000000000ull * dev->mt76.beacon_int) >> 10); 147 148 /* Adjust time to trigger hrtimer 8ms before TBTT */ 149 if (tbtt < PRE_TBTT_USEC) 150 time -= (PRE_TBTT_USEC - tbtt) * 1000ull; 151 else 152 time += (tbtt - PRE_TBTT_USEC) * 1000ull; 153 154 hrtimer_start(&dev->pre_tbtt_timer, time, HRTIMER_MODE_REL); 155 } 156 157 static void mt76x02u_stop_pre_tbtt_timer(struct mt76x02_dev *dev) 158 { 159 do { 160 hrtimer_cancel(&dev->pre_tbtt_timer); 161 cancel_work_sync(&dev->pre_tbtt_work); 162 /* Timer can be rearmed by work. */ 163 } while (hrtimer_active(&dev->pre_tbtt_timer)); 164 } 165 166 static void mt76x02u_pre_tbtt_work(struct work_struct *work) 167 { 168 struct mt76x02_dev *dev = 169 container_of(work, struct mt76x02_dev, pre_tbtt_work); 170 struct beacon_bc_data data = {}; 171 struct sk_buff *skb; 172 int i, nbeacons; 173 174 if (!dev->mt76.beacon_mask) 175 return; 176 177 if (mt76_hw(dev)->conf.flags & IEEE80211_CONF_OFFCHANNEL) 178 return; 179 180 mt76x02_resync_beacon_timer(dev); 181 182 ieee80211_iterate_active_interfaces(mt76_hw(dev), 183 IEEE80211_IFACE_ITER_RESUME_ALL, 184 mt76x02_update_beacon_iter, dev); 185 186 nbeacons = hweight8(dev->mt76.beacon_mask); 187 mt76x02_enqueue_buffered_bc(dev, &data, N_BCN_SLOTS - nbeacons); 188 189 for (i = nbeacons; i < N_BCN_SLOTS; i++) { 190 skb = __skb_dequeue(&data.q); 191 mt76x02_mac_set_beacon(dev, i, skb); 192 } 193 194 mt76x02u_restart_pre_tbtt_timer(dev); 195 } 196 197 static enum hrtimer_restart mt76x02u_pre_tbtt_interrupt(struct hrtimer *timer) 198 { 199 struct mt76x02_dev *dev = 200 container_of(timer, struct mt76x02_dev, pre_tbtt_timer); 201 202 queue_work(system_highpri_wq, &dev->pre_tbtt_work); 203 204 return HRTIMER_NORESTART; 205 } 206 207 static void mt76x02u_pre_tbtt_enable(struct mt76x02_dev *dev, bool en) 208 { 209 if (en && dev->mt76.beacon_mask && 210 !hrtimer_active(&dev->pre_tbtt_timer)) 211 mt76x02u_start_pre_tbtt_timer(dev); 212 if (!en) 213 mt76x02u_stop_pre_tbtt_timer(dev); 214 } 215 216 static void mt76x02u_beacon_enable(struct mt76x02_dev *dev, bool en) 217 { 218 int i; 219 220 if (WARN_ON_ONCE(!dev->mt76.beacon_int)) 221 return; 222 223 if (en) { 224 mt76x02u_start_pre_tbtt_timer(dev); 225 } else { 226 /* Timer is already stopped, only clean up 227 * PS buffered frames if any. 228 */ 229 for (i = 0; i < N_BCN_SLOTS; i++) 230 mt76x02_mac_set_beacon(dev, i, NULL); 231 } 232 } 233 234 void mt76x02u_init_beacon_config(struct mt76x02_dev *dev) 235 { 236 static const struct mt76x02_beacon_ops beacon_ops = { 237 .nslots = N_BCN_SLOTS, 238 .slot_size = (8192 / N_BCN_SLOTS) & ~63, 239 .pre_tbtt_enable = mt76x02u_pre_tbtt_enable, 240 .beacon_enable = mt76x02u_beacon_enable, 241 }; 242 dev->beacon_ops = &beacon_ops; 243 244 hrtimer_init(&dev->pre_tbtt_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); 245 dev->pre_tbtt_timer.function = mt76x02u_pre_tbtt_interrupt; 246 INIT_WORK(&dev->pre_tbtt_work, mt76x02u_pre_tbtt_work); 247 248 mt76x02_init_beacon_config(dev); 249 } 250 EXPORT_SYMBOL_GPL(mt76x02u_init_beacon_config); 251 252 void mt76x02u_exit_beacon_config(struct mt76x02_dev *dev) 253 { 254 if (!test_bit(MT76_REMOVED, &dev->mt76.state)) 255 mt76_clear(dev, MT_BEACON_TIME_CFG, 256 MT_BEACON_TIME_CFG_TIMER_EN | 257 MT_BEACON_TIME_CFG_SYNC_MODE | 258 MT_BEACON_TIME_CFG_TBTT_EN | 259 MT_BEACON_TIME_CFG_BEACON_TX); 260 261 mt76x02u_stop_pre_tbtt_timer(dev); 262 } 263 EXPORT_SYMBOL_GPL(mt76x02u_exit_beacon_config); 264