1 /* 2 * Scan implementation for ST-Ericsson CW1200 mac80211 drivers 3 * 4 * Copyright (c) 2010, ST-Ericsson 5 * Author: Dmitry Tarnyagin <dmitry.tarnyagin@lockless.no> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 */ 11 12 #include <linux/sched.h> 13 #include "cw1200.h" 14 #include "scan.h" 15 #include "sta.h" 16 #include "pm.h" 17 18 static void cw1200_scan_restart_delayed(struct cw1200_common *priv); 19 20 static int cw1200_scan_start(struct cw1200_common *priv, struct wsm_scan *scan) 21 { 22 int ret, i; 23 int tmo = 2000; 24 25 switch (priv->join_status) { 26 case CW1200_JOIN_STATUS_PRE_STA: 27 case CW1200_JOIN_STATUS_JOINING: 28 return -EBUSY; 29 default: 30 break; 31 } 32 33 wiphy_dbg(priv->hw->wiphy, "[SCAN] hw req, type %d, %d channels, flags: 0x%x.\n", 34 scan->type, scan->num_channels, scan->flags); 35 36 for (i = 0; i < scan->num_channels; ++i) 37 tmo += scan->ch[i].max_chan_time + 10; 38 39 cancel_delayed_work_sync(&priv->clear_recent_scan_work); 40 atomic_set(&priv->scan.in_progress, 1); 41 atomic_set(&priv->recent_scan, 1); 42 cw1200_pm_stay_awake(&priv->pm_state, msecs_to_jiffies(tmo)); 43 queue_delayed_work(priv->workqueue, &priv->scan.timeout, 44 msecs_to_jiffies(tmo)); 45 ret = wsm_scan(priv, scan); 46 if (ret) { 47 atomic_set(&priv->scan.in_progress, 0); 48 cancel_delayed_work_sync(&priv->scan.timeout); 49 cw1200_scan_restart_delayed(priv); 50 } 51 return ret; 52 } 53 54 int cw1200_hw_scan(struct ieee80211_hw *hw, 55 struct ieee80211_vif *vif, 56 struct ieee80211_scan_request *hw_req) 57 { 58 struct cw1200_common *priv = hw->priv; 59 struct cfg80211_scan_request *req = &hw_req->req; 60 struct wsm_template_frame frame = { 61 .frame_type = WSM_FRAME_TYPE_PROBE_REQUEST, 62 }; 63 int i, ret; 64 65 if (!priv->vif) 66 return -EINVAL; 67 68 /* Scan when P2P_GO corrupt firmware MiniAP mode */ 69 if (priv->join_status == CW1200_JOIN_STATUS_AP) 70 return -EOPNOTSUPP; 71 72 if (req->n_ssids == 1 && !req->ssids[0].ssid_len) 73 req->n_ssids = 0; 74 75 wiphy_dbg(hw->wiphy, "[SCAN] Scan request for %d SSIDs.\n", 76 req->n_ssids); 77 78 if (req->n_ssids > WSM_SCAN_MAX_NUM_OF_SSIDS) 79 return -EINVAL; 80 81 frame.skb = ieee80211_probereq_get(hw, priv->vif->addr, NULL, 0, 82 req->ie_len); 83 if (!frame.skb) 84 return -ENOMEM; 85 86 if (req->ie_len) 87 memcpy(skb_put(frame.skb, req->ie_len), req->ie, req->ie_len); 88 89 /* will be unlocked in cw1200_scan_work() */ 90 down(&priv->scan.lock); 91 mutex_lock(&priv->conf_mutex); 92 93 ret = wsm_set_template_frame(priv, &frame); 94 if (!ret) { 95 /* Host want to be the probe responder. */ 96 ret = wsm_set_probe_responder(priv, true); 97 } 98 if (ret) { 99 mutex_unlock(&priv->conf_mutex); 100 up(&priv->scan.lock); 101 dev_kfree_skb(frame.skb); 102 return ret; 103 } 104 105 wsm_lock_tx(priv); 106 107 BUG_ON(priv->scan.req); 108 priv->scan.req = req; 109 priv->scan.n_ssids = 0; 110 priv->scan.status = 0; 111 priv->scan.begin = &req->channels[0]; 112 priv->scan.curr = priv->scan.begin; 113 priv->scan.end = &req->channels[req->n_channels]; 114 priv->scan.output_power = priv->output_power; 115 116 for (i = 0; i < req->n_ssids; ++i) { 117 struct wsm_ssid *dst = &priv->scan.ssids[priv->scan.n_ssids]; 118 memcpy(&dst->ssid[0], req->ssids[i].ssid, sizeof(dst->ssid)); 119 dst->length = req->ssids[i].ssid_len; 120 ++priv->scan.n_ssids; 121 } 122 123 mutex_unlock(&priv->conf_mutex); 124 125 if (frame.skb) 126 dev_kfree_skb(frame.skb); 127 queue_work(priv->workqueue, &priv->scan.work); 128 return 0; 129 } 130 131 void cw1200_scan_work(struct work_struct *work) 132 { 133 struct cw1200_common *priv = container_of(work, struct cw1200_common, 134 scan.work); 135 struct ieee80211_channel **it; 136 struct wsm_scan scan = { 137 .type = WSM_SCAN_TYPE_FOREGROUND, 138 .flags = WSM_SCAN_FLAG_SPLIT_METHOD, 139 }; 140 bool first_run = (priv->scan.begin == priv->scan.curr && 141 priv->scan.begin != priv->scan.end); 142 int i; 143 144 if (first_run) { 145 /* Firmware gets crazy if scan request is sent 146 * when STA is joined but not yet associated. 147 * Force unjoin in this case. 148 */ 149 if (cancel_delayed_work_sync(&priv->join_timeout) > 0) 150 cw1200_join_timeout(&priv->join_timeout.work); 151 } 152 153 mutex_lock(&priv->conf_mutex); 154 155 if (first_run) { 156 if (priv->join_status == CW1200_JOIN_STATUS_STA && 157 !(priv->powersave_mode.mode & WSM_PSM_PS)) { 158 struct wsm_set_pm pm = priv->powersave_mode; 159 pm.mode = WSM_PSM_PS; 160 cw1200_set_pm(priv, &pm); 161 } else if (priv->join_status == CW1200_JOIN_STATUS_MONITOR) { 162 /* FW bug: driver has to restart p2p-dev mode 163 * after scan 164 */ 165 cw1200_disable_listening(priv); 166 } 167 } 168 169 if (!priv->scan.req || (priv->scan.curr == priv->scan.end)) { 170 if (priv->scan.output_power != priv->output_power) 171 wsm_set_output_power(priv, priv->output_power * 10); 172 if (priv->join_status == CW1200_JOIN_STATUS_STA && 173 !(priv->powersave_mode.mode & WSM_PSM_PS)) 174 cw1200_set_pm(priv, &priv->powersave_mode); 175 176 if (priv->scan.status < 0) 177 wiphy_warn(priv->hw->wiphy, 178 "[SCAN] Scan failed (%d).\n", 179 priv->scan.status); 180 else if (priv->scan.req) 181 wiphy_dbg(priv->hw->wiphy, 182 "[SCAN] Scan completed.\n"); 183 else 184 wiphy_dbg(priv->hw->wiphy, 185 "[SCAN] Scan canceled.\n"); 186 187 priv->scan.req = NULL; 188 cw1200_scan_restart_delayed(priv); 189 wsm_unlock_tx(priv); 190 mutex_unlock(&priv->conf_mutex); 191 ieee80211_scan_completed(priv->hw, priv->scan.status ? 1 : 0); 192 up(&priv->scan.lock); 193 return; 194 } else { 195 struct ieee80211_channel *first = *priv->scan.curr; 196 for (it = priv->scan.curr + 1, i = 1; 197 it != priv->scan.end && i < WSM_SCAN_MAX_NUM_OF_CHANNELS; 198 ++it, ++i) { 199 if ((*it)->band != first->band) 200 break; 201 if (((*it)->flags ^ first->flags) & 202 IEEE80211_CHAN_NO_IR) 203 break; 204 if (!(first->flags & IEEE80211_CHAN_NO_IR) && 205 (*it)->max_power != first->max_power) 206 break; 207 } 208 scan.band = first->band; 209 210 if (priv->scan.req->no_cck) 211 scan.max_tx_rate = WSM_TRANSMIT_RATE_6; 212 else 213 scan.max_tx_rate = WSM_TRANSMIT_RATE_1; 214 scan.num_probes = 215 (first->flags & IEEE80211_CHAN_NO_IR) ? 0 : 2; 216 scan.num_ssids = priv->scan.n_ssids; 217 scan.ssids = &priv->scan.ssids[0]; 218 scan.num_channels = it - priv->scan.curr; 219 /* TODO: Is it optimal? */ 220 scan.probe_delay = 100; 221 /* It is not stated in WSM specification, however 222 * FW team says that driver may not use FG scan 223 * when joined. 224 */ 225 if (priv->join_status == CW1200_JOIN_STATUS_STA) { 226 scan.type = WSM_SCAN_TYPE_BACKGROUND; 227 scan.flags = WSM_SCAN_FLAG_FORCE_BACKGROUND; 228 } 229 scan.ch = kzalloc( 230 sizeof(struct wsm_scan_ch) * (it - priv->scan.curr), 231 GFP_KERNEL); 232 if (!scan.ch) { 233 priv->scan.status = -ENOMEM; 234 goto fail; 235 } 236 for (i = 0; i < scan.num_channels; ++i) { 237 scan.ch[i].number = priv->scan.curr[i]->hw_value; 238 if (priv->scan.curr[i]->flags & IEEE80211_CHAN_NO_IR) { 239 scan.ch[i].min_chan_time = 50; 240 scan.ch[i].max_chan_time = 100; 241 } else { 242 scan.ch[i].min_chan_time = 10; 243 scan.ch[i].max_chan_time = 25; 244 } 245 } 246 if (!(first->flags & IEEE80211_CHAN_NO_IR) && 247 priv->scan.output_power != first->max_power) { 248 priv->scan.output_power = first->max_power; 249 wsm_set_output_power(priv, 250 priv->scan.output_power * 10); 251 } 252 priv->scan.status = cw1200_scan_start(priv, &scan); 253 kfree(scan.ch); 254 if (priv->scan.status) 255 goto fail; 256 priv->scan.curr = it; 257 } 258 mutex_unlock(&priv->conf_mutex); 259 return; 260 261 fail: 262 priv->scan.curr = priv->scan.end; 263 mutex_unlock(&priv->conf_mutex); 264 queue_work(priv->workqueue, &priv->scan.work); 265 return; 266 } 267 268 static void cw1200_scan_restart_delayed(struct cw1200_common *priv) 269 { 270 /* FW bug: driver has to restart p2p-dev mode after scan. */ 271 if (priv->join_status == CW1200_JOIN_STATUS_MONITOR) { 272 cw1200_enable_listening(priv); 273 cw1200_update_filtering(priv); 274 } 275 276 if (priv->delayed_unjoin) { 277 priv->delayed_unjoin = false; 278 if (queue_work(priv->workqueue, &priv->unjoin_work) <= 0) 279 wsm_unlock_tx(priv); 280 } else if (priv->delayed_link_loss) { 281 wiphy_dbg(priv->hw->wiphy, "[CQM] Requeue BSS loss.\n"); 282 priv->delayed_link_loss = 0; 283 cw1200_cqm_bssloss_sm(priv, 1, 0, 0); 284 } 285 } 286 287 static void cw1200_scan_complete(struct cw1200_common *priv) 288 { 289 queue_delayed_work(priv->workqueue, &priv->clear_recent_scan_work, HZ); 290 if (priv->scan.direct_probe) { 291 wiphy_dbg(priv->hw->wiphy, "[SCAN] Direct probe complete.\n"); 292 cw1200_scan_restart_delayed(priv); 293 priv->scan.direct_probe = 0; 294 up(&priv->scan.lock); 295 wsm_unlock_tx(priv); 296 } else { 297 cw1200_scan_work(&priv->scan.work); 298 } 299 } 300 301 void cw1200_scan_failed_cb(struct cw1200_common *priv) 302 { 303 if (priv->mode == NL80211_IFTYPE_UNSPECIFIED) 304 /* STA is stopped. */ 305 return; 306 307 if (cancel_delayed_work_sync(&priv->scan.timeout) > 0) { 308 priv->scan.status = -EIO; 309 queue_delayed_work(priv->workqueue, &priv->scan.timeout, 0); 310 } 311 } 312 313 314 void cw1200_scan_complete_cb(struct cw1200_common *priv, 315 struct wsm_scan_complete *arg) 316 { 317 if (priv->mode == NL80211_IFTYPE_UNSPECIFIED) 318 /* STA is stopped. */ 319 return; 320 321 if (cancel_delayed_work_sync(&priv->scan.timeout) > 0) { 322 priv->scan.status = 1; 323 queue_delayed_work(priv->workqueue, &priv->scan.timeout, 0); 324 } 325 } 326 327 void cw1200_clear_recent_scan_work(struct work_struct *work) 328 { 329 struct cw1200_common *priv = 330 container_of(work, struct cw1200_common, 331 clear_recent_scan_work.work); 332 atomic_xchg(&priv->recent_scan, 0); 333 } 334 335 void cw1200_scan_timeout(struct work_struct *work) 336 { 337 struct cw1200_common *priv = 338 container_of(work, struct cw1200_common, scan.timeout.work); 339 if (atomic_xchg(&priv->scan.in_progress, 0)) { 340 if (priv->scan.status > 0) { 341 priv->scan.status = 0; 342 } else if (!priv->scan.status) { 343 wiphy_warn(priv->hw->wiphy, 344 "Timeout waiting for scan complete notification.\n"); 345 priv->scan.status = -ETIMEDOUT; 346 priv->scan.curr = priv->scan.end; 347 wsm_stop_scan(priv); 348 } 349 cw1200_scan_complete(priv); 350 } 351 } 352 353 void cw1200_probe_work(struct work_struct *work) 354 { 355 struct cw1200_common *priv = 356 container_of(work, struct cw1200_common, scan.probe_work.work); 357 u8 queue_id = cw1200_queue_get_queue_id(priv->pending_frame_id); 358 struct cw1200_queue *queue = &priv->tx_queue[queue_id]; 359 const struct cw1200_txpriv *txpriv; 360 struct wsm_tx *wsm; 361 struct wsm_template_frame frame = { 362 .frame_type = WSM_FRAME_TYPE_PROBE_REQUEST, 363 }; 364 struct wsm_ssid ssids[1] = {{ 365 .length = 0, 366 } }; 367 struct wsm_scan_ch ch[1] = {{ 368 .min_chan_time = 0, 369 .max_chan_time = 10, 370 } }; 371 struct wsm_scan scan = { 372 .type = WSM_SCAN_TYPE_FOREGROUND, 373 .num_probes = 1, 374 .probe_delay = 0, 375 .num_channels = 1, 376 .ssids = ssids, 377 .ch = ch, 378 }; 379 u8 *ies; 380 size_t ies_len; 381 int ret; 382 383 wiphy_dbg(priv->hw->wiphy, "[SCAN] Direct probe work.\n"); 384 385 mutex_lock(&priv->conf_mutex); 386 if (down_trylock(&priv->scan.lock)) { 387 /* Scan is already in progress. Requeue self. */ 388 schedule(); 389 queue_delayed_work(priv->workqueue, &priv->scan.probe_work, 390 msecs_to_jiffies(100)); 391 mutex_unlock(&priv->conf_mutex); 392 return; 393 } 394 395 /* Make sure we still have a pending probe req */ 396 if (cw1200_queue_get_skb(queue, priv->pending_frame_id, 397 &frame.skb, &txpriv)) { 398 up(&priv->scan.lock); 399 mutex_unlock(&priv->conf_mutex); 400 wsm_unlock_tx(priv); 401 return; 402 } 403 wsm = (struct wsm_tx *)frame.skb->data; 404 scan.max_tx_rate = wsm->max_tx_rate; 405 scan.band = (priv->channel->band == NL80211_BAND_5GHZ) ? 406 WSM_PHY_BAND_5G : WSM_PHY_BAND_2_4G; 407 if (priv->join_status == CW1200_JOIN_STATUS_STA || 408 priv->join_status == CW1200_JOIN_STATUS_IBSS) { 409 scan.type = WSM_SCAN_TYPE_BACKGROUND; 410 scan.flags = WSM_SCAN_FLAG_FORCE_BACKGROUND; 411 } 412 ch[0].number = priv->channel->hw_value; 413 414 skb_pull(frame.skb, txpriv->offset); 415 416 ies = &frame.skb->data[sizeof(struct ieee80211_hdr_3addr)]; 417 ies_len = frame.skb->len - sizeof(struct ieee80211_hdr_3addr); 418 419 if (ies_len) { 420 u8 *ssidie = 421 (u8 *)cfg80211_find_ie(WLAN_EID_SSID, ies, ies_len); 422 if (ssidie && ssidie[1] && ssidie[1] <= sizeof(ssids[0].ssid)) { 423 u8 *nextie = &ssidie[2 + ssidie[1]]; 424 /* Remove SSID from the IE list. It has to be provided 425 * as a separate argument in cw1200_scan_start call 426 */ 427 428 /* Store SSID localy */ 429 ssids[0].length = ssidie[1]; 430 memcpy(ssids[0].ssid, &ssidie[2], ssids[0].length); 431 scan.num_ssids = 1; 432 433 /* Remove SSID from IE list */ 434 ssidie[1] = 0; 435 memmove(&ssidie[2], nextie, &ies[ies_len] - nextie); 436 skb_trim(frame.skb, frame.skb->len - ssids[0].length); 437 } 438 } 439 440 /* FW bug: driver has to restart p2p-dev mode after scan */ 441 if (priv->join_status == CW1200_JOIN_STATUS_MONITOR) 442 cw1200_disable_listening(priv); 443 ret = wsm_set_template_frame(priv, &frame); 444 priv->scan.direct_probe = 1; 445 if (!ret) { 446 wsm_flush_tx(priv); 447 ret = cw1200_scan_start(priv, &scan); 448 } 449 mutex_unlock(&priv->conf_mutex); 450 451 skb_push(frame.skb, txpriv->offset); 452 if (!ret) 453 IEEE80211_SKB_CB(frame.skb)->flags |= IEEE80211_TX_STAT_ACK; 454 BUG_ON(cw1200_queue_remove(queue, priv->pending_frame_id)); 455 456 if (ret) { 457 priv->scan.direct_probe = 0; 458 up(&priv->scan.lock); 459 wsm_unlock_tx(priv); 460 } 461 462 return; 463 } 464