iwl-scan.c revision 951891c7ef844919d30aac7b1fc7396fd8be23ff
1/****************************************************************************** 2 * 3 * GPL LICENSE SUMMARY 4 * 5 * Copyright(c) 2008 Intel Corporation. All rights reserved. 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of version 2 of the GNU General Public License as 9 * published by the Free Software Foundation. 10 * 11 * This program is distributed in the hope that it will be useful, but 12 * WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110, 19 * USA 20 * 21 * The full GNU General Public License is included in this distribution 22 * in the file called LICENSE.GPL. 23 * 24 * Contact Information: 25 * Tomas Winkler <tomas.winkler@intel.com> 26 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 27 *****************************************************************************/ 28#include <linux/types.h> 29#include <linux/etherdevice.h> 30#include <net/lib80211.h> 31#include <net/mac80211.h> 32 33#include "iwl-eeprom.h" 34#include "iwl-dev.h" 35#include "iwl-core.h" 36#include "iwl-sta.h" 37#include "iwl-io.h" 38#include "iwl-helpers.h" 39 40/* For active scan, listen ACTIVE_DWELL_TIME (msec) on each channel after 41 * sending probe req. This should be set long enough to hear probe responses 42 * from more than one AP. */ 43#define IWL_ACTIVE_DWELL_TIME_24 (30) /* all times in msec */ 44#define IWL_ACTIVE_DWELL_TIME_52 (20) 45 46#define IWL_ACTIVE_DWELL_FACTOR_24GHZ (3) 47#define IWL_ACTIVE_DWELL_FACTOR_52GHZ (2) 48 49/* For faster active scanning, scan will move to the next channel if fewer than 50 * PLCP_QUIET_THRESH packets are heard on this channel within 51 * ACTIVE_QUIET_TIME after sending probe request. This shortens the dwell 52 * time if it's a quiet channel (nothing responded to our probe, and there's 53 * no other traffic). 54 * Disable "quiet" feature by setting PLCP_QUIET_THRESH to 0. */ 55#define IWL_PLCP_QUIET_THRESH __constant_cpu_to_le16(1) /* packets */ 56#define IWL_ACTIVE_QUIET_TIME __constant_cpu_to_le16(10) /* msec */ 57 58/* For passive scan, listen PASSIVE_DWELL_TIME (msec) on each channel. 59 * Must be set longer than active dwell time. 60 * For the most reliable scan, set > AP beacon interval (typically 100msec). */ 61#define IWL_PASSIVE_DWELL_TIME_24 (20) /* all times in msec */ 62#define IWL_PASSIVE_DWELL_TIME_52 (10) 63#define IWL_PASSIVE_DWELL_BASE (100) 64#define IWL_CHANNEL_TUNE_TIME 5 65 66#define IWL_SCAN_PROBE_MASK(n) cpu_to_le32((BIT(n) | (BIT(n) - BIT(1)))) 67 68 69/** 70 * iwl_scan_cancel - Cancel any currently executing HW scan 71 * 72 * NOTE: priv->mutex is not required before calling this function 73 */ 74int iwl_scan_cancel(struct iwl_priv *priv) 75{ 76 if (!test_bit(STATUS_SCAN_HW, &priv->status)) { 77 clear_bit(STATUS_SCANNING, &priv->status); 78 return 0; 79 } 80 81 if (test_bit(STATUS_SCANNING, &priv->status)) { 82 if (!test_bit(STATUS_SCAN_ABORTING, &priv->status)) { 83 IWL_DEBUG_SCAN("Queuing scan abort.\n"); 84 set_bit(STATUS_SCAN_ABORTING, &priv->status); 85 queue_work(priv->workqueue, &priv->abort_scan); 86 87 } else 88 IWL_DEBUG_SCAN("Scan abort already in progress.\n"); 89 90 return test_bit(STATUS_SCANNING, &priv->status); 91 } 92 93 return 0; 94} 95EXPORT_SYMBOL(iwl_scan_cancel); 96/** 97 * iwl_scan_cancel_timeout - Cancel any currently executing HW scan 98 * @ms: amount of time to wait (in milliseconds) for scan to abort 99 * 100 * NOTE: priv->mutex must be held before calling this function 101 */ 102int iwl_scan_cancel_timeout(struct iwl_priv *priv, unsigned long ms) 103{ 104 unsigned long now = jiffies; 105 int ret; 106 107 ret = iwl_scan_cancel(priv); 108 if (ret && ms) { 109 mutex_unlock(&priv->mutex); 110 while (!time_after(jiffies, now + msecs_to_jiffies(ms)) && 111 test_bit(STATUS_SCANNING, &priv->status)) 112 msleep(1); 113 mutex_lock(&priv->mutex); 114 115 return test_bit(STATUS_SCANNING, &priv->status); 116 } 117 118 return ret; 119} 120EXPORT_SYMBOL(iwl_scan_cancel_timeout); 121 122static int iwl_send_scan_abort(struct iwl_priv *priv) 123{ 124 int ret = 0; 125 struct iwl_rx_packet *res; 126 struct iwl_host_cmd cmd = { 127 .id = REPLY_SCAN_ABORT_CMD, 128 .meta.flags = CMD_WANT_SKB, 129 }; 130 131 /* If there isn't a scan actively going on in the hardware 132 * then we are in between scan bands and not actually 133 * actively scanning, so don't send the abort command */ 134 if (!test_bit(STATUS_SCAN_HW, &priv->status)) { 135 clear_bit(STATUS_SCAN_ABORTING, &priv->status); 136 return 0; 137 } 138 139 ret = iwl_send_cmd_sync(priv, &cmd); 140 if (ret) { 141 clear_bit(STATUS_SCAN_ABORTING, &priv->status); 142 return ret; 143 } 144 145 res = (struct iwl_rx_packet *)cmd.meta.u.skb->data; 146 if (res->u.status != CAN_ABORT_STATUS) { 147 /* The scan abort will return 1 for success or 148 * 2 for "failure". A failure condition can be 149 * due to simply not being in an active scan which 150 * can occur if we send the scan abort before we 151 * the microcode has notified us that a scan is 152 * completed. */ 153 IWL_DEBUG_INFO("SCAN_ABORT returned %d.\n", res->u.status); 154 clear_bit(STATUS_SCAN_ABORTING, &priv->status); 155 clear_bit(STATUS_SCAN_HW, &priv->status); 156 } 157 158 priv->alloc_rxb_skb--; 159 dev_kfree_skb_any(cmd.meta.u.skb); 160 161 return ret; 162} 163 164 165/* Service response to REPLY_SCAN_CMD (0x80) */ 166static void iwl_rx_reply_scan(struct iwl_priv *priv, 167 struct iwl_rx_mem_buffer *rxb) 168{ 169#ifdef CONFIG_IWLWIFI_DEBUG 170 struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data; 171 struct iwl_scanreq_notification *notif = 172 (struct iwl_scanreq_notification *)pkt->u.raw; 173 174 IWL_DEBUG_RX("Scan request status = 0x%x\n", notif->status); 175#endif 176} 177 178/* Service SCAN_START_NOTIFICATION (0x82) */ 179static void iwl_rx_scan_start_notif(struct iwl_priv *priv, 180 struct iwl_rx_mem_buffer *rxb) 181{ 182 struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data; 183 struct iwl_scanstart_notification *notif = 184 (struct iwl_scanstart_notification *)pkt->u.raw; 185 priv->scan_start_tsf = le32_to_cpu(notif->tsf_low); 186 IWL_DEBUG_SCAN("Scan start: " 187 "%d [802.11%s] " 188 "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n", 189 notif->channel, 190 notif->band ? "bg" : "a", 191 le32_to_cpu(notif->tsf_high), 192 le32_to_cpu(notif->tsf_low), 193 notif->status, notif->beacon_timer); 194} 195 196/* Service SCAN_RESULTS_NOTIFICATION (0x83) */ 197static void iwl_rx_scan_results_notif(struct iwl_priv *priv, 198 struct iwl_rx_mem_buffer *rxb) 199{ 200#ifdef CONFIG_IWLWIFI_DEBUG 201 struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data; 202 struct iwl_scanresults_notification *notif = 203 (struct iwl_scanresults_notification *)pkt->u.raw; 204 205 IWL_DEBUG_SCAN("Scan ch.res: " 206 "%d [802.11%s] " 207 "(TSF: 0x%08X:%08X) - %d " 208 "elapsed=%lu usec (%dms since last)\n", 209 notif->channel, 210 notif->band ? "bg" : "a", 211 le32_to_cpu(notif->tsf_high), 212 le32_to_cpu(notif->tsf_low), 213 le32_to_cpu(notif->statistics[0]), 214 le32_to_cpu(notif->tsf_low) - priv->scan_start_tsf, 215 jiffies_to_msecs(elapsed_jiffies 216 (priv->last_scan_jiffies, jiffies))); 217#endif 218 219 priv->last_scan_jiffies = jiffies; 220 priv->next_scan_jiffies = 0; 221} 222 223/* Service SCAN_COMPLETE_NOTIFICATION (0x84) */ 224static void iwl_rx_scan_complete_notif(struct iwl_priv *priv, 225 struct iwl_rx_mem_buffer *rxb) 226{ 227#ifdef CONFIG_IWLWIFI_DEBUG 228 struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data; 229 struct iwl_scancomplete_notification *scan_notif = (void *)pkt->u.raw; 230 231 IWL_DEBUG_SCAN("Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n", 232 scan_notif->scanned_channels, 233 scan_notif->tsf_low, 234 scan_notif->tsf_high, scan_notif->status); 235#endif 236 237 /* The HW is no longer scanning */ 238 clear_bit(STATUS_SCAN_HW, &priv->status); 239 240 /* The scan completion notification came in, so kill that timer... */ 241 cancel_delayed_work(&priv->scan_check); 242 243 IWL_DEBUG_INFO("Scan pass on %sGHz took %dms\n", 244 (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ)) ? 245 "2.4" : "5.2", 246 jiffies_to_msecs(elapsed_jiffies 247 (priv->scan_pass_start, jiffies))); 248 249 /* Remove this scanned band from the list of pending 250 * bands to scan, band G precedes A in order of scanning 251 * as seen in iwl_bg_request_scan */ 252 if (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ)) 253 priv->scan_bands &= ~BIT(IEEE80211_BAND_2GHZ); 254 else if (priv->scan_bands & BIT(IEEE80211_BAND_5GHZ)) 255 priv->scan_bands &= ~BIT(IEEE80211_BAND_5GHZ); 256 257 /* If a request to abort was given, or the scan did not succeed 258 * then we reset the scan state machine and terminate, 259 * re-queuing another scan if one has been requested */ 260 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) { 261 IWL_DEBUG_INFO("Aborted scan completed.\n"); 262 clear_bit(STATUS_SCAN_ABORTING, &priv->status); 263 } else { 264 /* If there are more bands on this scan pass reschedule */ 265 if (priv->scan_bands) 266 goto reschedule; 267 } 268 269 priv->last_scan_jiffies = jiffies; 270 priv->next_scan_jiffies = 0; 271 IWL_DEBUG_INFO("Setting scan to off\n"); 272 273 clear_bit(STATUS_SCANNING, &priv->status); 274 275 IWL_DEBUG_INFO("Scan took %dms\n", 276 jiffies_to_msecs(elapsed_jiffies(priv->scan_start, jiffies))); 277 278 queue_work(priv->workqueue, &priv->scan_completed); 279 280 return; 281 282reschedule: 283 priv->scan_pass_start = jiffies; 284 queue_work(priv->workqueue, &priv->request_scan); 285} 286 287void iwl_setup_rx_scan_handlers(struct iwl_priv *priv) 288{ 289 /* scan handlers */ 290 priv->rx_handlers[REPLY_SCAN_CMD] = iwl_rx_reply_scan; 291 priv->rx_handlers[SCAN_START_NOTIFICATION] = iwl_rx_scan_start_notif; 292 priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] = 293 iwl_rx_scan_results_notif; 294 priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] = 295 iwl_rx_scan_complete_notif; 296} 297EXPORT_SYMBOL(iwl_setup_rx_scan_handlers); 298 299static inline u16 iwl_get_active_dwell_time(struct iwl_priv *priv, 300 enum ieee80211_band band, 301 u8 n_probes) 302{ 303 if (band == IEEE80211_BAND_5GHZ) 304 return IWL_ACTIVE_DWELL_TIME_52 + 305 IWL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1); 306 else 307 return IWL_ACTIVE_DWELL_TIME_24 + 308 IWL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1); 309} 310 311static u16 iwl_get_passive_dwell_time(struct iwl_priv *priv, 312 enum ieee80211_band band) 313{ 314 u16 passive = (band == IEEE80211_BAND_2GHZ) ? 315 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 : 316 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52; 317 318 if (iwl_is_associated(priv)) { 319 /* If we're associated, we clamp the maximum passive 320 * dwell time to be 98% of the beacon interval (minus 321 * 2 * channel tune time) */ 322 passive = priv->beacon_int; 323 if ((passive > IWL_PASSIVE_DWELL_BASE) || !passive) 324 passive = IWL_PASSIVE_DWELL_BASE; 325 passive = (passive * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2; 326 } 327 328 return passive; 329} 330 331static int iwl_get_channels_for_scan(struct iwl_priv *priv, 332 enum ieee80211_band band, 333 u8 is_active, u8 n_probes, 334 struct iwl_scan_channel *scan_ch) 335{ 336 const struct ieee80211_channel *channels = NULL; 337 const struct ieee80211_supported_band *sband; 338 const struct iwl_channel_info *ch_info; 339 u16 passive_dwell = 0; 340 u16 active_dwell = 0; 341 int added, i; 342 u16 channel; 343 344 sband = iwl_get_hw_mode(priv, band); 345 if (!sband) 346 return 0; 347 348 channels = sband->channels; 349 350 active_dwell = iwl_get_active_dwell_time(priv, band, n_probes); 351 passive_dwell = iwl_get_passive_dwell_time(priv, band); 352 353 if (passive_dwell <= active_dwell) 354 passive_dwell = active_dwell + 1; 355 356 for (i = 0, added = 0; i < sband->n_channels; i++) { 357 if (channels[i].flags & IEEE80211_CHAN_DISABLED) 358 continue; 359 360 channel = 361 ieee80211_frequency_to_channel(channels[i].center_freq); 362 scan_ch->channel = cpu_to_le16(channel); 363 364 ch_info = iwl_get_channel_info(priv, band, channel); 365 if (!is_channel_valid(ch_info)) { 366 IWL_DEBUG_SCAN("Channel %d is INVALID for this band.\n", 367 channel); 368 continue; 369 } 370 371 if (!is_active || is_channel_passive(ch_info) || 372 (channels[i].flags & IEEE80211_CHAN_PASSIVE_SCAN)) 373 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE; 374 else 375 scan_ch->type = SCAN_CHANNEL_TYPE_ACTIVE; 376 377 if (n_probes) 378 scan_ch->type |= IWL_SCAN_PROBE_MASK(n_probes); 379 380 scan_ch->active_dwell = cpu_to_le16(active_dwell); 381 scan_ch->passive_dwell = cpu_to_le16(passive_dwell); 382 383 /* Set txpower levels to defaults */ 384 scan_ch->dsp_atten = 110; 385 386 /* NOTE: if we were doing 6Mb OFDM for scans we'd use 387 * power level: 388 * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3; 389 */ 390 if (band == IEEE80211_BAND_5GHZ) 391 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3; 392 else 393 scan_ch->tx_gain = ((1 << 5) | (5 << 3)); 394 395 IWL_DEBUG_SCAN("Scanning ch=%d prob=0x%X [%s %d]\n", 396 channel, le32_to_cpu(scan_ch->type), 397 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ? 398 "ACTIVE" : "PASSIVE", 399 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ? 400 active_dwell : passive_dwell); 401 402 scan_ch++; 403 added++; 404 } 405 406 IWL_DEBUG_SCAN("total channels to scan %d \n", added); 407 return added; 408} 409 410void iwl_init_scan_params(struct iwl_priv *priv) 411{ 412 u8 ant_idx = fls(priv->hw_params.valid_tx_ant) - 1; 413 if (!priv->scan_tx_ant[IEEE80211_BAND_5GHZ]) 414 priv->scan_tx_ant[IEEE80211_BAND_5GHZ] = ant_idx; 415 if (!priv->scan_tx_ant[IEEE80211_BAND_2GHZ]) 416 priv->scan_tx_ant[IEEE80211_BAND_2GHZ] = ant_idx; 417} 418 419int iwl_scan_initiate(struct iwl_priv *priv) 420{ 421 if (!iwl_is_ready_rf(priv)) { 422 IWL_DEBUG_SCAN("Aborting scan due to not ready.\n"); 423 return -EIO; 424 } 425 426 if (test_bit(STATUS_SCANNING, &priv->status)) { 427 IWL_DEBUG_SCAN("Scan already in progress.\n"); 428 return -EAGAIN; 429 } 430 431 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) { 432 IWL_DEBUG_SCAN("Scan request while abort pending\n"); 433 return -EAGAIN; 434 } 435 436 IWL_DEBUG_INFO("Starting scan...\n"); 437 if (priv->cfg->sku & IWL_SKU_G) 438 priv->scan_bands |= BIT(IEEE80211_BAND_2GHZ); 439 if (priv->cfg->sku & IWL_SKU_A) 440 priv->scan_bands |= BIT(IEEE80211_BAND_5GHZ); 441 set_bit(STATUS_SCANNING, &priv->status); 442 priv->scan_start = jiffies; 443 priv->scan_pass_start = priv->scan_start; 444 445 queue_work(priv->workqueue, &priv->request_scan); 446 447 return 0; 448} 449EXPORT_SYMBOL(iwl_scan_initiate); 450 451#define IWL_SCAN_CHECK_WATCHDOG (7 * HZ) 452 453static void iwl_bg_scan_check(struct work_struct *data) 454{ 455 struct iwl_priv *priv = 456 container_of(data, struct iwl_priv, scan_check.work); 457 458 if (test_bit(STATUS_EXIT_PENDING, &priv->status)) 459 return; 460 461 mutex_lock(&priv->mutex); 462 if (test_bit(STATUS_SCANNING, &priv->status) || 463 test_bit(STATUS_SCAN_ABORTING, &priv->status)) { 464 IWL_DEBUG(IWL_DL_SCAN, "Scan completion watchdog resetting " 465 "adapter (%dms)\n", 466 jiffies_to_msecs(IWL_SCAN_CHECK_WATCHDOG)); 467 468 if (!test_bit(STATUS_EXIT_PENDING, &priv->status)) 469 iwl_send_scan_abort(priv); 470 } 471 mutex_unlock(&priv->mutex); 472} 473/** 474 * iwl_supported_rate_to_ie - fill in the supported rate in IE field 475 * 476 * return : set the bit for each supported rate insert in ie 477 */ 478static u16 iwl_supported_rate_to_ie(u8 *ie, u16 supported_rate, 479 u16 basic_rate, int *left) 480{ 481 u16 ret_rates = 0, bit; 482 int i; 483 u8 *cnt = ie; 484 u8 *rates = ie + 1; 485 486 for (bit = 1, i = 0; i < IWL_RATE_COUNT; i++, bit <<= 1) { 487 if (bit & supported_rate) { 488 ret_rates |= bit; 489 rates[*cnt] = iwl_rates[i].ieee | 490 ((bit & basic_rate) ? 0x80 : 0x00); 491 (*cnt)++; 492 (*left)--; 493 if ((*left <= 0) || 494 (*cnt >= IWL_SUPPORTED_RATES_IE_LEN)) 495 break; 496 } 497 } 498 499 return ret_rates; 500} 501 502 503static void iwl_ht_cap_to_ie(const struct ieee80211_supported_band *sband, 504 u8 *pos, int *left) 505{ 506 struct ieee80211_ht_cap *ht_cap; 507 508 if (!sband || !sband->ht_cap.ht_supported) 509 return; 510 511 if (*left < sizeof(struct ieee80211_ht_cap)) 512 return; 513 514 *pos++ = sizeof(struct ieee80211_ht_cap); 515 ht_cap = (struct ieee80211_ht_cap *) pos; 516 517 ht_cap->cap_info = cpu_to_le16(sband->ht_cap.cap); 518 memcpy(&ht_cap->mcs, &sband->ht_cap.mcs, 16); 519 ht_cap->ampdu_params_info = 520 (sband->ht_cap.ampdu_factor & IEEE80211_HT_AMPDU_PARM_FACTOR) | 521 ((sband->ht_cap.ampdu_density << 2) & 522 IEEE80211_HT_AMPDU_PARM_DENSITY); 523 *left -= sizeof(struct ieee80211_ht_cap); 524} 525 526/** 527 * iwl_fill_probe_req - fill in all required fields and IE for probe request 528 */ 529 530static u16 iwl_fill_probe_req(struct iwl_priv *priv, 531 enum ieee80211_band band, 532 struct ieee80211_mgmt *frame, 533 int left) 534{ 535 int len = 0; 536 u8 *pos = NULL; 537 u16 active_rates, ret_rates, cck_rates, active_rate_basic; 538 const struct ieee80211_supported_band *sband = 539 iwl_get_hw_mode(priv, band); 540 541 542 /* Make sure there is enough space for the probe request, 543 * two mandatory IEs and the data */ 544 left -= 24; 545 if (left < 0) 546 return 0; 547 548 frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ); 549 memcpy(frame->da, iwl_bcast_addr, ETH_ALEN); 550 memcpy(frame->sa, priv->mac_addr, ETH_ALEN); 551 memcpy(frame->bssid, iwl_bcast_addr, ETH_ALEN); 552 frame->seq_ctrl = 0; 553 554 len += 24; 555 556 /* ...next IE... */ 557 pos = &frame->u.probe_req.variable[0]; 558 559 /* fill in our indirect SSID IE */ 560 left -= 2; 561 if (left < 0) 562 return 0; 563 *pos++ = WLAN_EID_SSID; 564 *pos++ = 0; 565 566 len += 2; 567 568 /* fill in supported rate */ 569 left -= 2; 570 if (left < 0) 571 return 0; 572 573 *pos++ = WLAN_EID_SUPP_RATES; 574 *pos = 0; 575 576 /* exclude 60M rate */ 577 active_rates = priv->rates_mask; 578 active_rates &= ~IWL_RATE_60M_MASK; 579 580 active_rate_basic = active_rates & IWL_BASIC_RATES_MASK; 581 582 cck_rates = IWL_CCK_RATES_MASK & active_rates; 583 ret_rates = iwl_supported_rate_to_ie(pos, cck_rates, 584 active_rate_basic, &left); 585 active_rates &= ~ret_rates; 586 587 ret_rates = iwl_supported_rate_to_ie(pos, active_rates, 588 active_rate_basic, &left); 589 active_rates &= ~ret_rates; 590 591 len += 2 + *pos; 592 pos += (*pos) + 1; 593 594 if (active_rates == 0) 595 goto fill_end; 596 597 /* fill in supported extended rate */ 598 /* ...next IE... */ 599 left -= 2; 600 if (left < 0) 601 return 0; 602 /* ... fill it in... */ 603 *pos++ = WLAN_EID_EXT_SUPP_RATES; 604 *pos = 0; 605 iwl_supported_rate_to_ie(pos, active_rates, active_rate_basic, &left); 606 if (*pos > 0) { 607 len += 2 + *pos; 608 pos += (*pos) + 1; 609 } else { 610 pos--; 611 } 612 613 fill_end: 614 615 left -= 2; 616 if (left < 0) 617 return 0; 618 619 *pos++ = WLAN_EID_HT_CAPABILITY; 620 *pos = 0; 621 iwl_ht_cap_to_ie(sband, pos, &left); 622 if (*pos > 0) 623 len += 2 + *pos; 624 625 return (u16)len; 626} 627 628static void iwl_bg_request_scan(struct work_struct *data) 629{ 630 struct iwl_priv *priv = 631 container_of(data, struct iwl_priv, request_scan); 632 struct iwl_host_cmd cmd = { 633 .id = REPLY_SCAN_CMD, 634 .len = sizeof(struct iwl_scan_cmd), 635 .meta.flags = CMD_SIZE_HUGE, 636 }; 637 struct iwl_scan_cmd *scan; 638 struct ieee80211_conf *conf = NULL; 639 int ret = 0; 640 u32 rate_flags = 0; 641 u16 cmd_len; 642 enum ieee80211_band band; 643 u8 n_probes = 2; 644 u8 rx_chain = priv->hw_params.valid_rx_ant; 645 u8 rate; 646 DECLARE_SSID_BUF(ssid); 647 648 conf = ieee80211_get_hw_conf(priv->hw); 649 650 mutex_lock(&priv->mutex); 651 652 if (!iwl_is_ready(priv)) { 653 IWL_WARNING("request scan called when driver not ready.\n"); 654 goto done; 655 } 656 657 /* Make sure the scan wasn't cancelled before this queued work 658 * was given the chance to run... */ 659 if (!test_bit(STATUS_SCANNING, &priv->status)) 660 goto done; 661 662 /* This should never be called or scheduled if there is currently 663 * a scan active in the hardware. */ 664 if (test_bit(STATUS_SCAN_HW, &priv->status)) { 665 IWL_DEBUG_INFO("Multiple concurrent scan requests in parallel. " 666 "Ignoring second request.\n"); 667 ret = -EIO; 668 goto done; 669 } 670 671 if (test_bit(STATUS_EXIT_PENDING, &priv->status)) { 672 IWL_DEBUG_SCAN("Aborting scan due to device shutdown\n"); 673 goto done; 674 } 675 676 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) { 677 IWL_DEBUG_HC("Scan request while abort pending. Queuing.\n"); 678 goto done; 679 } 680 681 if (iwl_is_rfkill(priv)) { 682 IWL_DEBUG_HC("Aborting scan due to RF Kill activation\n"); 683 goto done; 684 } 685 686 if (!test_bit(STATUS_READY, &priv->status)) { 687 IWL_DEBUG_HC("Scan request while uninitialized. Queuing.\n"); 688 goto done; 689 } 690 691 if (!priv->scan_bands) { 692 IWL_DEBUG_HC("Aborting scan due to no requested bands\n"); 693 goto done; 694 } 695 696 if (!priv->scan) { 697 priv->scan = kmalloc(sizeof(struct iwl_scan_cmd) + 698 IWL_MAX_SCAN_SIZE, GFP_KERNEL); 699 if (!priv->scan) { 700 ret = -ENOMEM; 701 goto done; 702 } 703 } 704 scan = priv->scan; 705 memset(scan, 0, sizeof(struct iwl_scan_cmd) + IWL_MAX_SCAN_SIZE); 706 707 scan->quiet_plcp_th = IWL_PLCP_QUIET_THRESH; 708 scan->quiet_time = IWL_ACTIVE_QUIET_TIME; 709 710 if (iwl_is_associated(priv)) { 711 u16 interval = 0; 712 u32 extra; 713 u32 suspend_time = 100; 714 u32 scan_suspend_time = 100; 715 unsigned long flags; 716 717 IWL_DEBUG_INFO("Scanning while associated...\n"); 718 719 spin_lock_irqsave(&priv->lock, flags); 720 interval = priv->beacon_int; 721 spin_unlock_irqrestore(&priv->lock, flags); 722 723 scan->suspend_time = 0; 724 scan->max_out_time = cpu_to_le32(200 * 1024); 725 if (!interval) 726 interval = suspend_time; 727 728 extra = (suspend_time / interval) << 22; 729 scan_suspend_time = (extra | 730 ((suspend_time % interval) * 1024)); 731 scan->suspend_time = cpu_to_le32(scan_suspend_time); 732 IWL_DEBUG_SCAN("suspend_time 0x%X beacon interval %d\n", 733 scan_suspend_time, interval); 734 } 735 736 /* We should add the ability for user to lock to PASSIVE ONLY */ 737 if (priv->one_direct_scan) { 738 IWL_DEBUG_SCAN("Start direct scan for '%s'\n", 739 print_ssid(ssid, priv->direct_ssid, 740 priv->direct_ssid_len)); 741 scan->direct_scan[0].id = WLAN_EID_SSID; 742 scan->direct_scan[0].len = priv->direct_ssid_len; 743 memcpy(scan->direct_scan[0].ssid, 744 priv->direct_ssid, priv->direct_ssid_len); 745 n_probes++; 746 } else if (!iwl_is_associated(priv) && priv->essid_len) { 747 IWL_DEBUG_SCAN("Start direct scan for '%s' (not associated)\n", 748 print_ssid(ssid, priv->essid, priv->essid_len)); 749 scan->direct_scan[0].id = WLAN_EID_SSID; 750 scan->direct_scan[0].len = priv->essid_len; 751 memcpy(scan->direct_scan[0].ssid, priv->essid, priv->essid_len); 752 n_probes++; 753 } else { 754 IWL_DEBUG_SCAN("Start indirect scan.\n"); 755 } 756 757 scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK; 758 scan->tx_cmd.sta_id = priv->hw_params.bcast_sta_id; 759 scan->tx_cmd.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE; 760 761 762 if (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ)) { 763 band = IEEE80211_BAND_2GHZ; 764 scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK; 765 if (priv->active_rxon.flags & RXON_FLG_CHANNEL_MODE_PURE_40_MSK) { 766 rate = IWL_RATE_6M_PLCP; 767 } else { 768 rate = IWL_RATE_1M_PLCP; 769 rate_flags = RATE_MCS_CCK_MSK; 770 } 771 scan->good_CRC_th = 0; 772 } else if (priv->scan_bands & BIT(IEEE80211_BAND_5GHZ)) { 773 band = IEEE80211_BAND_5GHZ; 774 rate = IWL_RATE_6M_PLCP; 775 scan->good_CRC_th = IWL_GOOD_CRC_TH; 776 777 /* Force use of chains B and C (0x6) for scan Rx for 4965 778 * Avoid A (0x1) because of its off-channel reception on A-band. 779 */ 780 if ((priv->hw_rev & CSR_HW_REV_TYPE_MSK) == CSR_HW_REV_TYPE_4965) 781 rx_chain = 0x6; 782 } else { 783 IWL_WARNING("Invalid scan band count\n"); 784 goto done; 785 } 786 787 priv->scan_tx_ant[band] = 788 iwl_toggle_tx_ant(priv, priv->scan_tx_ant[band]); 789 rate_flags |= iwl_ant_idx_to_flags(priv->scan_tx_ant[band]); 790 scan->tx_cmd.rate_n_flags = iwl_hw_set_rate_n_flags(rate, rate_flags); 791 792 /* MIMO is not used here, but value is required */ 793 scan->rx_chain = RXON_RX_CHAIN_DRIVER_FORCE_MSK | 794 cpu_to_le16((0x7 << RXON_RX_CHAIN_VALID_POS) | 795 (rx_chain << RXON_RX_CHAIN_FORCE_SEL_POS) | 796 (0x7 << RXON_RX_CHAIN_FORCE_MIMO_SEL_POS)); 797 798 cmd_len = iwl_fill_probe_req(priv, band, 799 (struct ieee80211_mgmt *)scan->data, 800 IWL_MAX_SCAN_SIZE - sizeof(*scan)); 801 802 scan->tx_cmd.len = cpu_to_le16(cmd_len); 803 804 if (priv->iw_mode == NL80211_IFTYPE_MONITOR) 805 scan->filter_flags = RXON_FILTER_PROMISC_MSK; 806 807 scan->filter_flags |= (RXON_FILTER_ACCEPT_GRP_MSK | 808 RXON_FILTER_BCON_AWARE_MSK); 809 810 scan->channel_count = 811 iwl_get_channels_for_scan(priv, band, 1, /* active */ 812 n_probes, 813 (void *)&scan->data[le16_to_cpu(scan->tx_cmd.len)]); 814 815 if (scan->channel_count == 0) { 816 IWL_DEBUG_SCAN("channel count %d\n", scan->channel_count); 817 goto done; 818 } 819 820 cmd.len += le16_to_cpu(scan->tx_cmd.len) + 821 scan->channel_count * sizeof(struct iwl_scan_channel); 822 cmd.data = scan; 823 scan->len = cpu_to_le16(cmd.len); 824 825 set_bit(STATUS_SCAN_HW, &priv->status); 826 ret = iwl_send_cmd_sync(priv, &cmd); 827 if (ret) 828 goto done; 829 830 queue_delayed_work(priv->workqueue, &priv->scan_check, 831 IWL_SCAN_CHECK_WATCHDOG); 832 833 mutex_unlock(&priv->mutex); 834 return; 835 836 done: 837 /* Cannot perform scan. Make sure we clear scanning 838 * bits from status so next scan request can be performed. 839 * If we don't clear scanning status bit here all next scan 840 * will fail 841 */ 842 clear_bit(STATUS_SCAN_HW, &priv->status); 843 clear_bit(STATUS_SCANNING, &priv->status); 844 /* inform mac80211 scan aborted */ 845 queue_work(priv->workqueue, &priv->scan_completed); 846 mutex_unlock(&priv->mutex); 847} 848 849static void iwl_bg_abort_scan(struct work_struct *work) 850{ 851 struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan); 852 853 if (!iwl_is_ready(priv)) 854 return; 855 856 mutex_lock(&priv->mutex); 857 858 set_bit(STATUS_SCAN_ABORTING, &priv->status); 859 iwl_send_scan_abort(priv); 860 861 mutex_unlock(&priv->mutex); 862} 863 864static void iwl_bg_scan_completed(struct work_struct *work) 865{ 866 struct iwl_priv *priv = 867 container_of(work, struct iwl_priv, scan_completed); 868 869 IWL_DEBUG_SCAN("SCAN complete scan\n"); 870 871 if (test_bit(STATUS_EXIT_PENDING, &priv->status)) 872 return; 873 874 ieee80211_scan_completed(priv->hw); 875 876 /* Since setting the TXPOWER may have been deferred while 877 * performing the scan, fire one off */ 878 mutex_lock(&priv->mutex); 879 iwl_set_tx_power(priv, priv->tx_power_user_lmt, true); 880 mutex_unlock(&priv->mutex); 881} 882 883 884void iwl_setup_scan_deferred_work(struct iwl_priv *priv) 885{ 886 INIT_WORK(&priv->scan_completed, iwl_bg_scan_completed); 887 INIT_WORK(&priv->request_scan, iwl_bg_request_scan); 888 INIT_WORK(&priv->abort_scan, iwl_bg_abort_scan); 889 INIT_DELAYED_WORK(&priv->scan_check, iwl_bg_scan_check); 890} 891EXPORT_SYMBOL(iwl_setup_scan_deferred_work); 892 893