1 /* 2 * Copyright (c) 2013 Eugene Krasnikov <k.eugene.e@gmail.com> 3 * 4 * Permission to use, copy, modify, and/or distribute this software for any 5 * purpose with or without fee is hereby granted, provided that the above 6 * copyright notice and this permission notice appear in all copies. 7 * 8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY 11 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION 13 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN 14 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 15 */ 16 17 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 18 19 #include "txrx.h" 20 21 static inline int get_rssi0(struct wcn36xx_rx_bd *bd) 22 { 23 return 100 - ((bd->phy_stat0 >> 24) & 0xff); 24 } 25 26 struct wcn36xx_rate { 27 u16 bitrate; 28 u16 mcs_or_legacy_index; 29 enum mac80211_rx_encoding encoding; 30 enum mac80211_rx_encoding_flags encoding_flags; 31 enum rate_info_bw bw; 32 }; 33 34 static const struct wcn36xx_rate wcn36xx_rate_table[] = { 35 /* 11b rates */ 36 { 10, 0, RX_ENC_LEGACY, 0, RATE_INFO_BW_20 }, 37 { 20, 1, RX_ENC_LEGACY, 0, RATE_INFO_BW_20 }, 38 { 55, 2, RX_ENC_LEGACY, 0, RATE_INFO_BW_20 }, 39 { 110, 3, RX_ENC_LEGACY, 0, RATE_INFO_BW_20 }, 40 41 /* 11b SP (short preamble) */ 42 { 10, 0, RX_ENC_LEGACY, RX_ENC_FLAG_SHORTPRE, RATE_INFO_BW_20 }, 43 { 20, 1, RX_ENC_LEGACY, RX_ENC_FLAG_SHORTPRE, RATE_INFO_BW_20 }, 44 { 55, 2, RX_ENC_LEGACY, RX_ENC_FLAG_SHORTPRE, RATE_INFO_BW_20 }, 45 { 110, 3, RX_ENC_LEGACY, RX_ENC_FLAG_SHORTPRE, RATE_INFO_BW_20 }, 46 47 /* 11ag */ 48 { 60, 4, RX_ENC_LEGACY, 0, RATE_INFO_BW_20 }, 49 { 90, 5, RX_ENC_LEGACY, 0, RATE_INFO_BW_20 }, 50 { 120, 6, RX_ENC_LEGACY, 0, RATE_INFO_BW_20 }, 51 { 180, 7, RX_ENC_LEGACY, 0, RATE_INFO_BW_20 }, 52 { 240, 8, RX_ENC_LEGACY, 0, RATE_INFO_BW_20 }, 53 { 360, 9, RX_ENC_LEGACY, 0, RATE_INFO_BW_20 }, 54 { 480, 10, RX_ENC_LEGACY, 0, RATE_INFO_BW_20 }, 55 { 540, 11, RX_ENC_LEGACY, 0, RATE_INFO_BW_20 }, 56 57 /* 11n */ 58 { 65, 0, RX_ENC_HT, 0, RATE_INFO_BW_20 }, 59 { 130, 1, RX_ENC_HT, 0, RATE_INFO_BW_20 }, 60 { 195, 2, RX_ENC_HT, 0, RATE_INFO_BW_20 }, 61 { 260, 3, RX_ENC_HT, 0, RATE_INFO_BW_20 }, 62 { 390, 4, RX_ENC_HT, 0, RATE_INFO_BW_20 }, 63 { 520, 5, RX_ENC_HT, 0, RATE_INFO_BW_20 }, 64 { 585, 6, RX_ENC_HT, 0, RATE_INFO_BW_20 }, 65 { 650, 7, RX_ENC_HT, 0, RATE_INFO_BW_20 }, 66 67 /* 11n SGI */ 68 { 72, 0, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_20 }, 69 { 144, 1, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_20 }, 70 { 217, 2, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_20 }, 71 { 289, 3, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_20 }, 72 { 434, 4, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_20 }, 73 { 578, 5, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_20 }, 74 { 650, 6, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_20 }, 75 { 722, 7, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_20 }, 76 77 /* 11n GF (greenfield) */ 78 { 65, 0, RX_ENC_HT, RX_ENC_FLAG_HT_GF, RATE_INFO_BW_20 }, 79 { 130, 1, RX_ENC_HT, RX_ENC_FLAG_HT_GF, RATE_INFO_BW_20 }, 80 { 195, 2, RX_ENC_HT, RX_ENC_FLAG_HT_GF, RATE_INFO_BW_20 }, 81 { 260, 3, RX_ENC_HT, RX_ENC_FLAG_HT_GF, RATE_INFO_BW_20 }, 82 { 390, 4, RX_ENC_HT, RX_ENC_FLAG_HT_GF, RATE_INFO_BW_20 }, 83 { 520, 5, RX_ENC_HT, RX_ENC_FLAG_HT_GF, RATE_INFO_BW_20 }, 84 { 585, 6, RX_ENC_HT, RX_ENC_FLAG_HT_GF, RATE_INFO_BW_20 }, 85 { 650, 7, RX_ENC_HT, RX_ENC_FLAG_HT_GF, RATE_INFO_BW_20 }, 86 87 /* 11n CB (channel bonding) */ 88 { 135, 0, RX_ENC_HT, 0, RATE_INFO_BW_40 }, 89 { 270, 1, RX_ENC_HT, 0, RATE_INFO_BW_40 }, 90 { 405, 2, RX_ENC_HT, 0, RATE_INFO_BW_40 }, 91 { 540, 3, RX_ENC_HT, 0, RATE_INFO_BW_40 }, 92 { 810, 4, RX_ENC_HT, 0, RATE_INFO_BW_40 }, 93 { 1080, 5, RX_ENC_HT, 0, RATE_INFO_BW_40 }, 94 { 1215, 6, RX_ENC_HT, 0, RATE_INFO_BW_40 }, 95 { 1350, 7, RX_ENC_HT, 0, RATE_INFO_BW_40 }, 96 97 /* 11n CB + SGI */ 98 { 150, 0, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_40 }, 99 { 300, 1, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_40 }, 100 { 450, 2, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_40 }, 101 { 600, 3, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_40 }, 102 { 900, 4, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_40 }, 103 { 1200, 5, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_40 }, 104 { 1350, 6, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_40 }, 105 { 1500, 7, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_40 }, 106 107 /* 11n GF + CB */ 108 { 135, 0, RX_ENC_HT, RX_ENC_FLAG_HT_GF, RATE_INFO_BW_40 }, 109 { 270, 1, RX_ENC_HT, RX_ENC_FLAG_HT_GF, RATE_INFO_BW_40 }, 110 { 405, 2, RX_ENC_HT, RX_ENC_FLAG_HT_GF, RATE_INFO_BW_40 }, 111 { 540, 3, RX_ENC_HT, RX_ENC_FLAG_HT_GF, RATE_INFO_BW_40 }, 112 { 810, 4, RX_ENC_HT, RX_ENC_FLAG_HT_GF, RATE_INFO_BW_40 }, 113 { 1080, 5, RX_ENC_HT, RX_ENC_FLAG_HT_GF, RATE_INFO_BW_40 }, 114 { 1215, 6, RX_ENC_HT, RX_ENC_FLAG_HT_GF, RATE_INFO_BW_40 }, 115 { 1350, 7, RX_ENC_HT, RX_ENC_FLAG_HT_GF, RATE_INFO_BW_40 }, 116 117 /* TODO: AC rates */ 118 }; 119 120 int wcn36xx_rx_skb(struct wcn36xx *wcn, struct sk_buff *skb) 121 { 122 struct ieee80211_rx_status status; 123 const struct wcn36xx_rate *rate; 124 struct ieee80211_hdr *hdr; 125 struct wcn36xx_rx_bd *bd; 126 u16 fc, sn; 127 128 /* 129 * All fields must be 0, otherwise it can lead to 130 * unexpected consequences. 131 */ 132 memset(&status, 0, sizeof(status)); 133 134 bd = (struct wcn36xx_rx_bd *)skb->data; 135 buff_to_be((u32 *)bd, sizeof(*bd)/sizeof(u32)); 136 wcn36xx_dbg_dump(WCN36XX_DBG_RX_DUMP, 137 "BD <<< ", (char *)bd, 138 sizeof(struct wcn36xx_rx_bd)); 139 140 skb_put(skb, bd->pdu.mpdu_header_off + bd->pdu.mpdu_len); 141 skb_pull(skb, bd->pdu.mpdu_header_off); 142 143 hdr = (struct ieee80211_hdr *) skb->data; 144 fc = __le16_to_cpu(hdr->frame_control); 145 sn = IEEE80211_SEQ_TO_SN(__le16_to_cpu(hdr->seq_ctrl)); 146 147 /* When scanning associate beacons to this */ 148 if (ieee80211_is_beacon(hdr->frame_control) && wcn->scan_freq) { 149 status.freq = wcn->scan_freq; 150 status.band = wcn->scan_band; 151 } else { 152 status.freq = WCN36XX_CENTER_FREQ(wcn); 153 status.band = WCN36XX_BAND(wcn); 154 } 155 156 status.mactime = 10; 157 status.signal = -get_rssi0(bd); 158 status.antenna = 1; 159 status.flag = 0; 160 status.rx_flags = 0; 161 status.flag |= RX_FLAG_IV_STRIPPED | 162 RX_FLAG_MMIC_STRIPPED | 163 RX_FLAG_DECRYPTED; 164 165 wcn36xx_dbg(WCN36XX_DBG_RX, "status.flags=%x\n", status.flag); 166 167 if (bd->rate_id < ARRAY_SIZE(wcn36xx_rate_table)) { 168 rate = &wcn36xx_rate_table[bd->rate_id]; 169 status.encoding = rate->encoding; 170 status.enc_flags = rate->encoding_flags; 171 status.bw = rate->bw; 172 status.rate_idx = rate->mcs_or_legacy_index; 173 } else { 174 status.encoding = 0; 175 status.bw = 0; 176 status.enc_flags = 0; 177 status.rate_idx = 0; 178 } 179 180 memcpy(IEEE80211_SKB_RXCB(skb), &status, sizeof(status)); 181 182 if (ieee80211_is_beacon(hdr->frame_control)) { 183 wcn36xx_dbg(WCN36XX_DBG_BEACON, "beacon skb %p len %d fc %04x sn %d\n", 184 skb, skb->len, fc, sn); 185 wcn36xx_dbg_dump(WCN36XX_DBG_BEACON_DUMP, "SKB <<< ", 186 (char *)skb->data, skb->len); 187 } else { 188 wcn36xx_dbg(WCN36XX_DBG_RX, "rx skb %p len %d fc %04x sn %d\n", 189 skb, skb->len, fc, sn); 190 wcn36xx_dbg_dump(WCN36XX_DBG_RX_DUMP, "SKB <<< ", 191 (char *)skb->data, skb->len); 192 } 193 194 ieee80211_rx_irqsafe(wcn->hw, skb); 195 196 return 0; 197 } 198 199 static void wcn36xx_set_tx_pdu(struct wcn36xx_tx_bd *bd, 200 u32 mpdu_header_len, 201 u32 len, 202 u16 tid) 203 { 204 bd->pdu.mpdu_header_len = mpdu_header_len; 205 bd->pdu.mpdu_header_off = sizeof(*bd); 206 bd->pdu.mpdu_data_off = bd->pdu.mpdu_header_len + 207 bd->pdu.mpdu_header_off; 208 bd->pdu.mpdu_len = len; 209 bd->pdu.tid = tid; 210 /* Use seq number generated by mac80211 */ 211 bd->pdu.bd_ssn = WCN36XX_TXBD_SSN_FILL_HOST; 212 } 213 214 static inline struct wcn36xx_vif *get_vif_by_addr(struct wcn36xx *wcn, 215 u8 *addr) 216 { 217 struct wcn36xx_vif *vif_priv = NULL; 218 struct ieee80211_vif *vif = NULL; 219 list_for_each_entry(vif_priv, &wcn->vif_list, list) { 220 vif = wcn36xx_priv_to_vif(vif_priv); 221 if (memcmp(vif->addr, addr, ETH_ALEN) == 0) 222 return vif_priv; 223 } 224 wcn36xx_warn("vif %pM not found\n", addr); 225 return NULL; 226 } 227 228 static void wcn36xx_tx_start_ampdu(struct wcn36xx *wcn, 229 struct wcn36xx_sta *sta_priv, 230 struct sk_buff *skb) 231 { 232 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 233 struct ieee80211_sta *sta; 234 u8 *qc, tid; 235 236 if (!conf_is_ht(&wcn->hw->conf)) 237 return; 238 239 sta = wcn36xx_priv_to_sta(sta_priv); 240 241 if (WARN_ON(!ieee80211_is_data_qos(hdr->frame_control))) 242 return; 243 244 if (skb_get_queue_mapping(skb) == IEEE80211_AC_VO) 245 return; 246 247 qc = ieee80211_get_qos_ctl(hdr); 248 tid = qc[0] & IEEE80211_QOS_CTL_TID_MASK; 249 250 spin_lock(&sta_priv->ampdu_lock); 251 if (sta_priv->ampdu_state[tid] != WCN36XX_AMPDU_NONE) 252 goto out_unlock; 253 254 if (sta_priv->non_agg_frame_ct++ >= WCN36XX_AMPDU_START_THRESH) { 255 sta_priv->ampdu_state[tid] = WCN36XX_AMPDU_START; 256 sta_priv->non_agg_frame_ct = 0; 257 ieee80211_start_tx_ba_session(sta, tid, 0); 258 } 259 out_unlock: 260 spin_unlock(&sta_priv->ampdu_lock); 261 } 262 263 static void wcn36xx_set_tx_data(struct wcn36xx_tx_bd *bd, 264 struct wcn36xx *wcn, 265 struct wcn36xx_vif **vif_priv, 266 struct wcn36xx_sta *sta_priv, 267 struct sk_buff *skb, 268 bool bcast) 269 { 270 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 271 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 272 struct ieee80211_vif *vif = NULL; 273 struct wcn36xx_vif *__vif_priv = NULL; 274 bool is_data_qos = ieee80211_is_data_qos(hdr->frame_control); 275 u16 tid = 0; 276 277 bd->bd_rate = WCN36XX_BD_RATE_DATA; 278 279 /* 280 * For not unicast frames mac80211 will not set sta pointer so use 281 * self_sta_index instead. 282 */ 283 if (sta_priv) { 284 __vif_priv = sta_priv->vif; 285 vif = wcn36xx_priv_to_vif(__vif_priv); 286 287 bd->dpu_sign = sta_priv->ucast_dpu_sign; 288 if (vif->type == NL80211_IFTYPE_STATION) { 289 bd->sta_index = sta_priv->bss_sta_index; 290 bd->dpu_desc_idx = sta_priv->bss_dpu_desc_index; 291 } else if (vif->type == NL80211_IFTYPE_AP || 292 vif->type == NL80211_IFTYPE_ADHOC || 293 vif->type == NL80211_IFTYPE_MESH_POINT) { 294 bd->sta_index = sta_priv->sta_index; 295 bd->dpu_desc_idx = sta_priv->dpu_desc_index; 296 } 297 } else { 298 __vif_priv = get_vif_by_addr(wcn, hdr->addr2); 299 bd->sta_index = __vif_priv->self_sta_index; 300 bd->dpu_desc_idx = __vif_priv->self_dpu_desc_index; 301 bd->dpu_sign = __vif_priv->self_ucast_dpu_sign; 302 } 303 304 if (is_data_qos) { 305 tid = ieee80211_get_tid(hdr); 306 /* TID->QID is one-to-one mapping */ 307 bd->queue_id = tid; 308 } 309 310 if (info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT || 311 (sta_priv && !sta_priv->is_data_encrypted)) { 312 bd->dpu_ne = 1; 313 } 314 315 if (ieee80211_is_any_nullfunc(hdr->frame_control)) { 316 /* Don't use a regular queue for null packet (no ampdu) */ 317 bd->queue_id = WCN36XX_TX_U_WQ_ID; 318 } 319 320 if (bcast) { 321 bd->ub = 1; 322 bd->ack_policy = 1; 323 } 324 *vif_priv = __vif_priv; 325 326 wcn36xx_set_tx_pdu(bd, 327 is_data_qos ? 328 sizeof(struct ieee80211_qos_hdr) : 329 sizeof(struct ieee80211_hdr_3addr), 330 skb->len, tid); 331 332 if (sta_priv && is_data_qos) 333 wcn36xx_tx_start_ampdu(wcn, sta_priv, skb); 334 } 335 336 static void wcn36xx_set_tx_mgmt(struct wcn36xx_tx_bd *bd, 337 struct wcn36xx *wcn, 338 struct wcn36xx_vif **vif_priv, 339 struct sk_buff *skb, 340 bool bcast) 341 { 342 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 343 struct wcn36xx_vif *__vif_priv = 344 get_vif_by_addr(wcn, hdr->addr2); 345 bd->sta_index = __vif_priv->self_sta_index; 346 bd->dpu_desc_idx = __vif_priv->self_dpu_desc_index; 347 bd->dpu_ne = 1; 348 349 /* default rate for unicast */ 350 if (ieee80211_is_mgmt(hdr->frame_control)) 351 bd->bd_rate = (WCN36XX_BAND(wcn) == NL80211_BAND_5GHZ) ? 352 WCN36XX_BD_RATE_CTRL : 353 WCN36XX_BD_RATE_MGMT; 354 else if (ieee80211_is_ctl(hdr->frame_control)) 355 bd->bd_rate = WCN36XX_BD_RATE_CTRL; 356 else 357 wcn36xx_warn("frame control type unknown\n"); 358 359 /* 360 * In joining state trick hardware that probe is sent as 361 * unicast even if address is broadcast. 362 */ 363 if (__vif_priv->is_joining && 364 ieee80211_is_probe_req(hdr->frame_control)) 365 bcast = false; 366 367 if (bcast) { 368 /* broadcast */ 369 bd->ub = 1; 370 /* No ack needed not unicast */ 371 bd->ack_policy = 1; 372 bd->queue_id = WCN36XX_TX_B_WQ_ID; 373 } else 374 bd->queue_id = WCN36XX_TX_U_WQ_ID; 375 *vif_priv = __vif_priv; 376 377 wcn36xx_set_tx_pdu(bd, 378 ieee80211_is_data_qos(hdr->frame_control) ? 379 sizeof(struct ieee80211_qos_hdr) : 380 sizeof(struct ieee80211_hdr_3addr), 381 skb->len, WCN36XX_TID); 382 } 383 384 int wcn36xx_start_tx(struct wcn36xx *wcn, 385 struct wcn36xx_sta *sta_priv, 386 struct sk_buff *skb) 387 { 388 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 389 struct wcn36xx_vif *vif_priv = NULL; 390 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 391 unsigned long flags; 392 bool is_low = ieee80211_is_data(hdr->frame_control); 393 bool bcast = is_broadcast_ether_addr(hdr->addr1) || 394 is_multicast_ether_addr(hdr->addr1); 395 struct wcn36xx_tx_bd bd; 396 int ret; 397 398 memset(&bd, 0, sizeof(bd)); 399 400 wcn36xx_dbg(WCN36XX_DBG_TX, 401 "tx skb %p len %d fc %04x sn %d %s %s\n", 402 skb, skb->len, __le16_to_cpu(hdr->frame_control), 403 IEEE80211_SEQ_TO_SN(__le16_to_cpu(hdr->seq_ctrl)), 404 is_low ? "low" : "high", bcast ? "bcast" : "ucast"); 405 406 wcn36xx_dbg_dump(WCN36XX_DBG_TX_DUMP, "", skb->data, skb->len); 407 408 bd.dpu_rf = WCN36XX_BMU_WQ_TX; 409 410 if (info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS) { 411 wcn36xx_dbg(WCN36XX_DBG_DXE, "TX_ACK status requested\n"); 412 413 spin_lock_irqsave(&wcn->dxe_lock, flags); 414 if (wcn->tx_ack_skb) { 415 spin_unlock_irqrestore(&wcn->dxe_lock, flags); 416 wcn36xx_warn("tx_ack_skb already set\n"); 417 return -EINVAL; 418 } 419 420 wcn->tx_ack_skb = skb; 421 spin_unlock_irqrestore(&wcn->dxe_lock, flags); 422 423 /* Only one at a time is supported by fw. Stop the TX queues 424 * until the ack status gets back. 425 */ 426 ieee80211_stop_queues(wcn->hw); 427 428 /* TX watchdog if no TX irq or ack indication received */ 429 mod_timer(&wcn->tx_ack_timer, jiffies + HZ / 10); 430 431 /* Request ack indication from the firmware */ 432 if (!(info->flags & IEEE80211_TX_CTL_NO_ACK)) 433 bd.tx_comp = 1; 434 } 435 436 /* Data frames served first*/ 437 if (is_low) 438 wcn36xx_set_tx_data(&bd, wcn, &vif_priv, sta_priv, skb, bcast); 439 else 440 /* MGMT and CTRL frames are handeld here*/ 441 wcn36xx_set_tx_mgmt(&bd, wcn, &vif_priv, skb, bcast); 442 443 buff_to_be((u32 *)&bd, sizeof(bd)/sizeof(u32)); 444 bd.tx_bd_sign = 0xbdbdbdbd; 445 446 ret = wcn36xx_dxe_tx_frame(wcn, vif_priv, &bd, skb, is_low); 447 if (ret && (info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS)) { 448 /* If the skb has not been transmitted, 449 * don't keep a reference to it. 450 */ 451 spin_lock_irqsave(&wcn->dxe_lock, flags); 452 wcn->tx_ack_skb = NULL; 453 spin_unlock_irqrestore(&wcn->dxe_lock, flags); 454 455 ieee80211_wake_queues(wcn->hw); 456 } 457 458 return ret; 459 } 460