1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Scan implementation for ST-Ericsson CW1200 mac80211 drivers 4 * 5 * Copyright (c) 2010, ST-Ericsson 6 * Author: Dmitry Tarnyagin <dmitry.tarnyagin@lockless.no> 7 */ 8 9 #include <linux/sched.h> 10 #include "cw1200.h" 11 #include "scan.h" 12 #include "sta.h" 13 #include "pm.h" 14 15 static void cw1200_scan_restart_delayed(struct cw1200_common *priv); 16 17 static int cw1200_scan_start(struct cw1200_common *priv, struct wsm_scan *scan) 18 { 19 int ret, i; 20 int tmo = 2000; 21 22 switch (priv->join_status) { 23 case CW1200_JOIN_STATUS_PRE_STA: 24 case CW1200_JOIN_STATUS_JOINING: 25 return -EBUSY; 26 default: 27 break; 28 } 29 30 wiphy_dbg(priv->hw->wiphy, "[SCAN] hw req, type %d, %d channels, flags: 0x%x.\n", 31 scan->type, scan->num_channels, scan->flags); 32 33 for (i = 0; i < scan->num_channels; ++i) 34 tmo += scan->ch[i].max_chan_time + 10; 35 36 cancel_delayed_work_sync(&priv->clear_recent_scan_work); 37 atomic_set(&priv->scan.in_progress, 1); 38 atomic_set(&priv->recent_scan, 1); 39 cw1200_pm_stay_awake(&priv->pm_state, msecs_to_jiffies(tmo)); 40 queue_delayed_work(priv->workqueue, &priv->scan.timeout, 41 msecs_to_jiffies(tmo)); 42 ret = wsm_scan(priv, scan); 43 if (ret) { 44 atomic_set(&priv->scan.in_progress, 0); 45 cancel_delayed_work_sync(&priv->scan.timeout); 46 cw1200_scan_restart_delayed(priv); 47 } 48 return ret; 49 } 50 51 int cw1200_hw_scan(struct ieee80211_hw *hw, 52 struct ieee80211_vif *vif, 53 struct ieee80211_scan_request *hw_req) 54 { 55 struct cw1200_common *priv = hw->priv; 56 struct cfg80211_scan_request *req = &hw_req->req; 57 struct wsm_template_frame frame = { 58 .frame_type = WSM_FRAME_TYPE_PROBE_REQUEST, 59 }; 60 int i, ret; 61 62 if (!priv->vif) 63 return -EINVAL; 64 65 /* Scan when P2P_GO corrupt firmware MiniAP mode */ 66 if (priv->join_status == CW1200_JOIN_STATUS_AP) 67 return -EOPNOTSUPP; 68 69 if (req->n_ssids == 1 && !req->ssids[0].ssid_len) 70 req->n_ssids = 0; 71 72 wiphy_dbg(hw->wiphy, "[SCAN] Scan request for %d SSIDs.\n", 73 req->n_ssids); 74 75 if (req->n_ssids > WSM_SCAN_MAX_NUM_OF_SSIDS) 76 return -EINVAL; 77 78 frame.skb = ieee80211_probereq_get(hw, priv->vif->addr, NULL, 0, 79 req->ie_len); 80 if (!frame.skb) 81 return -ENOMEM; 82 83 if (req->ie_len) 84 skb_put_data(frame.skb, req->ie, req->ie_len); 85 86 /* will be unlocked in cw1200_scan_work() */ 87 down(&priv->scan.lock); 88 mutex_lock(&priv->conf_mutex); 89 90 ret = wsm_set_template_frame(priv, &frame); 91 if (!ret) { 92 /* Host want to be the probe responder. */ 93 ret = wsm_set_probe_responder(priv, true); 94 } 95 if (ret) { 96 mutex_unlock(&priv->conf_mutex); 97 up(&priv->scan.lock); 98 dev_kfree_skb(frame.skb); 99 return ret; 100 } 101 102 wsm_lock_tx(priv); 103 104 BUG_ON(priv->scan.req); 105 priv->scan.req = req; 106 priv->scan.n_ssids = 0; 107 priv->scan.status = 0; 108 priv->scan.begin = &req->channels[0]; 109 priv->scan.curr = priv->scan.begin; 110 priv->scan.end = &req->channels[req->n_channels]; 111 priv->scan.output_power = priv->output_power; 112 113 for (i = 0; i < req->n_ssids; ++i) { 114 struct wsm_ssid *dst = &priv->scan.ssids[priv->scan.n_ssids]; 115 memcpy(&dst->ssid[0], req->ssids[i].ssid, sizeof(dst->ssid)); 116 dst->length = req->ssids[i].ssid_len; 117 ++priv->scan.n_ssids; 118 } 119 120 mutex_unlock(&priv->conf_mutex); 121 dev_kfree_skb(frame.skb); 122 queue_work(priv->workqueue, &priv->scan.work); 123 return 0; 124 } 125 126 void cw1200_scan_work(struct work_struct *work) 127 { 128 struct cw1200_common *priv = container_of(work, struct cw1200_common, 129 scan.work); 130 struct ieee80211_channel **it; 131 struct wsm_scan scan = { 132 .type = WSM_SCAN_TYPE_FOREGROUND, 133 .flags = WSM_SCAN_FLAG_SPLIT_METHOD, 134 }; 135 bool first_run = (priv->scan.begin == priv->scan.curr && 136 priv->scan.begin != priv->scan.end); 137 int i; 138 139 if (first_run) { 140 /* Firmware gets crazy if scan request is sent 141 * when STA is joined but not yet associated. 142 * Force unjoin in this case. 143 */ 144 if (cancel_delayed_work_sync(&priv->join_timeout) > 0) 145 cw1200_join_timeout(&priv->join_timeout.work); 146 } 147 148 mutex_lock(&priv->conf_mutex); 149 150 if (first_run) { 151 if (priv->join_status == CW1200_JOIN_STATUS_STA && 152 !(priv->powersave_mode.mode & WSM_PSM_PS)) { 153 struct wsm_set_pm pm = priv->powersave_mode; 154 pm.mode = WSM_PSM_PS; 155 cw1200_set_pm(priv, &pm); 156 } else if (priv->join_status == CW1200_JOIN_STATUS_MONITOR) { 157 /* FW bug: driver has to restart p2p-dev mode 158 * after scan 159 */ 160 cw1200_disable_listening(priv); 161 } 162 } 163 164 if (!priv->scan.req || (priv->scan.curr == priv->scan.end)) { 165 struct cfg80211_scan_info info = { 166 .aborted = priv->scan.status ? 1 : 0, 167 }; 168 169 if (priv->scan.output_power != priv->output_power) 170 wsm_set_output_power(priv, priv->output_power * 10); 171 if (priv->join_status == CW1200_JOIN_STATUS_STA && 172 !(priv->powersave_mode.mode & WSM_PSM_PS)) 173 cw1200_set_pm(priv, &priv->powersave_mode); 174 175 if (priv->scan.status < 0) 176 wiphy_warn(priv->hw->wiphy, 177 "[SCAN] Scan failed (%d).\n", 178 priv->scan.status); 179 else if (priv->scan.req) 180 wiphy_dbg(priv->hw->wiphy, 181 "[SCAN] Scan completed.\n"); 182 else 183 wiphy_dbg(priv->hw->wiphy, 184 "[SCAN] Scan canceled.\n"); 185 186 priv->scan.req = NULL; 187 cw1200_scan_restart_delayed(priv); 188 wsm_unlock_tx(priv); 189 mutex_unlock(&priv->conf_mutex); 190 ieee80211_scan_completed(priv->hw, &info); 191 up(&priv->scan.lock); 192 return; 193 } else { 194 struct ieee80211_channel *first = *priv->scan.curr; 195 for (it = priv->scan.curr + 1, i = 1; 196 it != priv->scan.end && i < WSM_SCAN_MAX_NUM_OF_CHANNELS; 197 ++it, ++i) { 198 if ((*it)->band != first->band) 199 break; 200 if (((*it)->flags ^ first->flags) & 201 IEEE80211_CHAN_NO_IR) 202 break; 203 if (!(first->flags & IEEE80211_CHAN_NO_IR) && 204 (*it)->max_power != first->max_power) 205 break; 206 } 207 scan.band = first->band; 208 209 if (priv->scan.req->no_cck) 210 scan.max_tx_rate = WSM_TRANSMIT_RATE_6; 211 else 212 scan.max_tx_rate = WSM_TRANSMIT_RATE_1; 213 scan.num_probes = 214 (first->flags & IEEE80211_CHAN_NO_IR) ? 0 : 2; 215 scan.num_ssids = priv->scan.n_ssids; 216 scan.ssids = &priv->scan.ssids[0]; 217 scan.num_channels = it - priv->scan.curr; 218 /* TODO: Is it optimal? */ 219 scan.probe_delay = 100; 220 /* It is not stated in WSM specification, however 221 * FW team says that driver may not use FG scan 222 * when joined. 223 */ 224 if (priv->join_status == CW1200_JOIN_STATUS_STA) { 225 scan.type = WSM_SCAN_TYPE_BACKGROUND; 226 scan.flags = WSM_SCAN_FLAG_FORCE_BACKGROUND; 227 } 228 scan.ch = kzalloc_objs(struct wsm_scan_ch, it - priv->scan.curr); 229 if (!scan.ch) { 230 priv->scan.status = -ENOMEM; 231 goto fail; 232 } 233 for (i = 0; i < scan.num_channels; ++i) { 234 scan.ch[i].number = priv->scan.curr[i]->hw_value; 235 if (priv->scan.curr[i]->flags & IEEE80211_CHAN_NO_IR) { 236 scan.ch[i].min_chan_time = 50; 237 scan.ch[i].max_chan_time = 100; 238 } else { 239 scan.ch[i].min_chan_time = 10; 240 scan.ch[i].max_chan_time = 25; 241 } 242 } 243 if (!(first->flags & IEEE80211_CHAN_NO_IR) && 244 priv->scan.output_power != first->max_power) { 245 priv->scan.output_power = first->max_power; 246 wsm_set_output_power(priv, 247 priv->scan.output_power * 10); 248 } 249 priv->scan.status = cw1200_scan_start(priv, &scan); 250 kfree(scan.ch); 251 if (priv->scan.status) 252 goto fail; 253 priv->scan.curr = it; 254 } 255 mutex_unlock(&priv->conf_mutex); 256 return; 257 258 fail: 259 priv->scan.curr = priv->scan.end; 260 mutex_unlock(&priv->conf_mutex); 261 queue_work(priv->workqueue, &priv->scan.work); 262 return; 263 } 264 265 static void cw1200_scan_restart_delayed(struct cw1200_common *priv) 266 { 267 /* FW bug: driver has to restart p2p-dev mode after scan. */ 268 if (priv->join_status == CW1200_JOIN_STATUS_MONITOR) { 269 cw1200_enable_listening(priv); 270 cw1200_update_filtering(priv); 271 } 272 273 if (priv->delayed_unjoin) { 274 priv->delayed_unjoin = false; 275 if (queue_work(priv->workqueue, &priv->unjoin_work) <= 0) 276 wsm_unlock_tx(priv); 277 } else if (priv->delayed_link_loss) { 278 wiphy_dbg(priv->hw->wiphy, "[CQM] Requeue BSS loss.\n"); 279 priv->delayed_link_loss = 0; 280 cw1200_cqm_bssloss_sm(priv, 1, 0, 0); 281 } 282 } 283 284 static void cw1200_scan_complete(struct cw1200_common *priv) 285 { 286 queue_delayed_work(priv->workqueue, &priv->clear_recent_scan_work, HZ); 287 if (priv->scan.direct_probe) { 288 wiphy_dbg(priv->hw->wiphy, "[SCAN] Direct probe complete.\n"); 289 cw1200_scan_restart_delayed(priv); 290 priv->scan.direct_probe = 0; 291 up(&priv->scan.lock); 292 wsm_unlock_tx(priv); 293 } else { 294 cw1200_scan_work(&priv->scan.work); 295 } 296 } 297 298 void cw1200_scan_failed_cb(struct cw1200_common *priv) 299 { 300 if (priv->mode == NL80211_IFTYPE_UNSPECIFIED) 301 /* STA is stopped. */ 302 return; 303 304 if (cancel_delayed_work_sync(&priv->scan.timeout) > 0) { 305 priv->scan.status = -EIO; 306 queue_delayed_work(priv->workqueue, &priv->scan.timeout, 0); 307 } 308 } 309 310 311 void cw1200_scan_complete_cb(struct cw1200_common *priv, 312 struct wsm_scan_complete *arg) 313 { 314 if (priv->mode == NL80211_IFTYPE_UNSPECIFIED) 315 /* STA is stopped. */ 316 return; 317 318 if (cancel_delayed_work_sync(&priv->scan.timeout) > 0) { 319 priv->scan.status = 1; 320 queue_delayed_work(priv->workqueue, &priv->scan.timeout, 0); 321 } 322 } 323 324 void cw1200_clear_recent_scan_work(struct work_struct *work) 325 { 326 struct cw1200_common *priv = 327 container_of(work, struct cw1200_common, 328 clear_recent_scan_work.work); 329 atomic_xchg(&priv->recent_scan, 0); 330 } 331 332 void cw1200_scan_timeout(struct work_struct *work) 333 { 334 struct cw1200_common *priv = 335 container_of(work, struct cw1200_common, scan.timeout.work); 336 if (atomic_xchg(&priv->scan.in_progress, 0)) { 337 if (priv->scan.status > 0) { 338 priv->scan.status = 0; 339 } else if (!priv->scan.status) { 340 wiphy_warn(priv->hw->wiphy, 341 "Timeout waiting for scan complete notification.\n"); 342 priv->scan.status = -ETIMEDOUT; 343 priv->scan.curr = priv->scan.end; 344 wsm_stop_scan(priv); 345 } 346 cw1200_scan_complete(priv); 347 } 348 } 349 350 void cw1200_probe_work(struct work_struct *work) 351 { 352 struct cw1200_common *priv = 353 container_of(work, struct cw1200_common, scan.probe_work.work); 354 u8 queue_id = cw1200_queue_get_queue_id(priv->pending_frame_id); 355 struct cw1200_queue *queue = &priv->tx_queue[queue_id]; 356 const struct cw1200_txpriv *txpriv; 357 struct wsm_tx *wsm; 358 struct wsm_template_frame frame = { 359 .frame_type = WSM_FRAME_TYPE_PROBE_REQUEST, 360 }; 361 struct wsm_ssid ssids[1] = {{ 362 .length = 0, 363 } }; 364 struct wsm_scan_ch ch[1] = {{ 365 .min_chan_time = 0, 366 .max_chan_time = 10, 367 } }; 368 struct wsm_scan scan = { 369 .type = WSM_SCAN_TYPE_FOREGROUND, 370 .num_probes = 1, 371 .probe_delay = 0, 372 .num_channels = 1, 373 .ssids = ssids, 374 .ch = ch, 375 }; 376 u8 *ies; 377 size_t ies_len; 378 int ret; 379 380 wiphy_dbg(priv->hw->wiphy, "[SCAN] Direct probe work.\n"); 381 382 mutex_lock(&priv->conf_mutex); 383 if (down_trylock(&priv->scan.lock)) { 384 /* Scan is already in progress. Requeue self. */ 385 schedule(); 386 queue_delayed_work(priv->workqueue, &priv->scan.probe_work, 387 msecs_to_jiffies(100)); 388 mutex_unlock(&priv->conf_mutex); 389 return; 390 } 391 392 /* Make sure we still have a pending probe req */ 393 if (cw1200_queue_get_skb(queue, priv->pending_frame_id, 394 &frame.skb, &txpriv)) { 395 up(&priv->scan.lock); 396 mutex_unlock(&priv->conf_mutex); 397 wsm_unlock_tx(priv); 398 return; 399 } 400 wsm = (struct wsm_tx *)frame.skb->data; 401 scan.max_tx_rate = wsm->max_tx_rate; 402 scan.band = (priv->channel->band == NL80211_BAND_5GHZ) ? 403 WSM_PHY_BAND_5G : WSM_PHY_BAND_2_4G; 404 if (priv->join_status == CW1200_JOIN_STATUS_STA || 405 priv->join_status == CW1200_JOIN_STATUS_IBSS) { 406 scan.type = WSM_SCAN_TYPE_BACKGROUND; 407 scan.flags = WSM_SCAN_FLAG_FORCE_BACKGROUND; 408 } 409 ch[0].number = priv->channel->hw_value; 410 411 skb_pull(frame.skb, txpriv->offset); 412 413 ies = &frame.skb->data[sizeof(struct ieee80211_hdr_3addr)]; 414 ies_len = frame.skb->len - sizeof(struct ieee80211_hdr_3addr); 415 416 if (ies_len) { 417 u8 *ssidie = 418 (u8 *)cfg80211_find_ie(WLAN_EID_SSID, ies, ies_len); 419 if (ssidie && ssidie[1] && ssidie[1] <= sizeof(ssids[0].ssid)) { 420 u8 *nextie = &ssidie[2 + ssidie[1]]; 421 /* Remove SSID from the IE list. It has to be provided 422 * as a separate argument in cw1200_scan_start call 423 */ 424 425 /* Store SSID localy */ 426 ssids[0].length = ssidie[1]; 427 memcpy(ssids[0].ssid, &ssidie[2], ssids[0].length); 428 scan.num_ssids = 1; 429 430 /* Remove SSID from IE list */ 431 ssidie[1] = 0; 432 memmove(&ssidie[2], nextie, &ies[ies_len] - nextie); 433 skb_trim(frame.skb, frame.skb->len - ssids[0].length); 434 } 435 } 436 437 /* FW bug: driver has to restart p2p-dev mode after scan */ 438 if (priv->join_status == CW1200_JOIN_STATUS_MONITOR) 439 cw1200_disable_listening(priv); 440 ret = wsm_set_template_frame(priv, &frame); 441 priv->scan.direct_probe = 1; 442 if (!ret) { 443 wsm_flush_tx(priv); 444 ret = cw1200_scan_start(priv, &scan); 445 } 446 mutex_unlock(&priv->conf_mutex); 447 448 skb_push(frame.skb, txpriv->offset); 449 if (!ret) 450 IEEE80211_SKB_CB(frame.skb)->flags |= IEEE80211_TX_STAT_ACK; 451 BUG_ON(cw1200_queue_remove(queue, priv->pending_frame_id)); 452 453 if (ret) { 454 priv->scan.direct_probe = 0; 455 up(&priv->scan.lock); 456 wsm_unlock_tx(priv); 457 } 458 459 return; 460 } 461