iwl-scan.c revision 17f841cd6cb0837ba0599ad18a746c30ddd83e08
1/****************************************************************************** 2 * 3 * GPL LICENSE SUMMARY 4 * 5 * Copyright(c) 2008 - 2009 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 * Intel Linux Wireless <ilw@linux.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 passive scan, listen PASSIVE_DWELL_TIME (msec) on each channel. 50 * Must be set longer than active dwell time. 51 * For the most reliable scan, set > AP beacon interval (typically 100msec). */ 52#define IWL_PASSIVE_DWELL_TIME_24 (20) /* all times in msec */ 53#define IWL_PASSIVE_DWELL_TIME_52 (10) 54#define IWL_PASSIVE_DWELL_BASE (100) 55#define IWL_CHANNEL_TUNE_TIME 5 56 57 58 59/** 60 * iwl_scan_cancel - Cancel any currently executing HW scan 61 * 62 * NOTE: priv->mutex is not required before calling this function 63 */ 64int iwl_scan_cancel(struct iwl_priv *priv) 65{ 66 if (!test_bit(STATUS_SCAN_HW, &priv->status)) { 67 clear_bit(STATUS_SCANNING, &priv->status); 68 return 0; 69 } 70 71 if (test_bit(STATUS_SCANNING, &priv->status)) { 72 if (!test_bit(STATUS_SCAN_ABORTING, &priv->status)) { 73 IWL_DEBUG_SCAN("Queuing scan abort.\n"); 74 set_bit(STATUS_SCAN_ABORTING, &priv->status); 75 queue_work(priv->workqueue, &priv->abort_scan); 76 77 } else 78 IWL_DEBUG_SCAN("Scan abort already in progress.\n"); 79 80 return test_bit(STATUS_SCANNING, &priv->status); 81 } 82 83 return 0; 84} 85EXPORT_SYMBOL(iwl_scan_cancel); 86/** 87 * iwl_scan_cancel_timeout - Cancel any currently executing HW scan 88 * @ms: amount of time to wait (in milliseconds) for scan to abort 89 * 90 * NOTE: priv->mutex must be held before calling this function 91 */ 92int iwl_scan_cancel_timeout(struct iwl_priv *priv, unsigned long ms) 93{ 94 unsigned long now = jiffies; 95 int ret; 96 97 ret = iwl_scan_cancel(priv); 98 if (ret && ms) { 99 mutex_unlock(&priv->mutex); 100 while (!time_after(jiffies, now + msecs_to_jiffies(ms)) && 101 test_bit(STATUS_SCANNING, &priv->status)) 102 msleep(1); 103 mutex_lock(&priv->mutex); 104 105 return test_bit(STATUS_SCANNING, &priv->status); 106 } 107 108 return ret; 109} 110EXPORT_SYMBOL(iwl_scan_cancel_timeout); 111 112int iwl_send_scan_abort(struct iwl_priv *priv) 113{ 114 int ret = 0; 115 struct iwl_rx_packet *res; 116 struct iwl_host_cmd cmd = { 117 .id = REPLY_SCAN_ABORT_CMD, 118 .meta.flags = CMD_WANT_SKB, 119 }; 120 121 /* If there isn't a scan actively going on in the hardware 122 * then we are in between scan bands and not actually 123 * actively scanning, so don't send the abort command */ 124 if (!test_bit(STATUS_SCAN_HW, &priv->status)) { 125 clear_bit(STATUS_SCAN_ABORTING, &priv->status); 126 return 0; 127 } 128 129 ret = iwl_send_cmd_sync(priv, &cmd); 130 if (ret) { 131 clear_bit(STATUS_SCAN_ABORTING, &priv->status); 132 return ret; 133 } 134 135 res = (struct iwl_rx_packet *)cmd.meta.u.skb->data; 136 if (res->u.status != CAN_ABORT_STATUS) { 137 /* The scan abort will return 1 for success or 138 * 2 for "failure". A failure condition can be 139 * due to simply not being in an active scan which 140 * can occur if we send the scan abort before we 141 * the microcode has notified us that a scan is 142 * completed. */ 143 IWL_DEBUG_INFO("SCAN_ABORT returned %d.\n", res->u.status); 144 clear_bit(STATUS_SCAN_ABORTING, &priv->status); 145 clear_bit(STATUS_SCAN_HW, &priv->status); 146 } 147 148 priv->alloc_rxb_skb--; 149 dev_kfree_skb_any(cmd.meta.u.skb); 150 151 return ret; 152} 153EXPORT_SYMBOL(iwl_send_scan_abort); 154 155/* Service response to REPLY_SCAN_CMD (0x80) */ 156static void iwl_rx_reply_scan(struct iwl_priv *priv, 157 struct iwl_rx_mem_buffer *rxb) 158{ 159#ifdef CONFIG_IWLWIFI_DEBUG 160 struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data; 161 struct iwl_scanreq_notification *notif = 162 (struct iwl_scanreq_notification *)pkt->u.raw; 163 164 IWL_DEBUG_RX("Scan request status = 0x%x\n", notif->status); 165#endif 166} 167 168/* Service SCAN_START_NOTIFICATION (0x82) */ 169static void iwl_rx_scan_start_notif(struct iwl_priv *priv, 170 struct iwl_rx_mem_buffer *rxb) 171{ 172 struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data; 173 struct iwl_scanstart_notification *notif = 174 (struct iwl_scanstart_notification *)pkt->u.raw; 175 priv->scan_start_tsf = le32_to_cpu(notif->tsf_low); 176 IWL_DEBUG_SCAN("Scan start: " 177 "%d [802.11%s] " 178 "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n", 179 notif->channel, 180 notif->band ? "bg" : "a", 181 le32_to_cpu(notif->tsf_high), 182 le32_to_cpu(notif->tsf_low), 183 notif->status, notif->beacon_timer); 184} 185 186/* Service SCAN_RESULTS_NOTIFICATION (0x83) */ 187static void iwl_rx_scan_results_notif(struct iwl_priv *priv, 188 struct iwl_rx_mem_buffer *rxb) 189{ 190#ifdef CONFIG_IWLWIFI_DEBUG 191 struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data; 192 struct iwl_scanresults_notification *notif = 193 (struct iwl_scanresults_notification *)pkt->u.raw; 194 195 IWL_DEBUG_SCAN("Scan ch.res: " 196 "%d [802.11%s] " 197 "(TSF: 0x%08X:%08X) - %d " 198 "elapsed=%lu usec (%dms since last)\n", 199 notif->channel, 200 notif->band ? "bg" : "a", 201 le32_to_cpu(notif->tsf_high), 202 le32_to_cpu(notif->tsf_low), 203 le32_to_cpu(notif->statistics[0]), 204 le32_to_cpu(notif->tsf_low) - priv->scan_start_tsf, 205 jiffies_to_msecs(elapsed_jiffies 206 (priv->last_scan_jiffies, jiffies))); 207#endif 208 209 priv->last_scan_jiffies = jiffies; 210 priv->next_scan_jiffies = 0; 211} 212 213/* Service SCAN_COMPLETE_NOTIFICATION (0x84) */ 214static void iwl_rx_scan_complete_notif(struct iwl_priv *priv, 215 struct iwl_rx_mem_buffer *rxb) 216{ 217#ifdef CONFIG_IWLWIFI_DEBUG 218 struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data; 219 struct iwl_scancomplete_notification *scan_notif = (void *)pkt->u.raw; 220 221 IWL_DEBUG_SCAN("Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n", 222 scan_notif->scanned_channels, 223 scan_notif->tsf_low, 224 scan_notif->tsf_high, scan_notif->status); 225#endif 226 227 /* The HW is no longer scanning */ 228 clear_bit(STATUS_SCAN_HW, &priv->status); 229 230 /* The scan completion notification came in, so kill that timer... */ 231 cancel_delayed_work(&priv->scan_check); 232 233 IWL_DEBUG_INFO("Scan pass on %sGHz took %dms\n", 234 (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ)) ? 235 "2.4" : "5.2", 236 jiffies_to_msecs(elapsed_jiffies 237 (priv->scan_pass_start, jiffies))); 238 239 /* Remove this scanned band from the list of pending 240 * bands to scan, band G precedes A in order of scanning 241 * as seen in iwl_bg_request_scan */ 242 if (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ)) 243 priv->scan_bands &= ~BIT(IEEE80211_BAND_2GHZ); 244 else if (priv->scan_bands & BIT(IEEE80211_BAND_5GHZ)) 245 priv->scan_bands &= ~BIT(IEEE80211_BAND_5GHZ); 246 247 /* If a request to abort was given, or the scan did not succeed 248 * then we reset the scan state machine and terminate, 249 * re-queuing another scan if one has been requested */ 250 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) { 251 IWL_DEBUG_INFO("Aborted scan completed.\n"); 252 clear_bit(STATUS_SCAN_ABORTING, &priv->status); 253 } else { 254 /* If there are more bands on this scan pass reschedule */ 255 if (priv->scan_bands) 256 goto reschedule; 257 } 258 259 priv->last_scan_jiffies = jiffies; 260 priv->next_scan_jiffies = 0; 261 IWL_DEBUG_INFO("Setting scan to off\n"); 262 263 clear_bit(STATUS_SCANNING, &priv->status); 264 265 IWL_DEBUG_INFO("Scan took %dms\n", 266 jiffies_to_msecs(elapsed_jiffies(priv->scan_start, jiffies))); 267 268 queue_work(priv->workqueue, &priv->scan_completed); 269 270 return; 271 272reschedule: 273 priv->scan_pass_start = jiffies; 274 queue_work(priv->workqueue, &priv->request_scan); 275} 276 277void iwl_setup_rx_scan_handlers(struct iwl_priv *priv) 278{ 279 /* scan handlers */ 280 priv->rx_handlers[REPLY_SCAN_CMD] = iwl_rx_reply_scan; 281 priv->rx_handlers[SCAN_START_NOTIFICATION] = iwl_rx_scan_start_notif; 282 priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] = 283 iwl_rx_scan_results_notif; 284 priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] = 285 iwl_rx_scan_complete_notif; 286} 287EXPORT_SYMBOL(iwl_setup_rx_scan_handlers); 288 289inline u16 iwl_get_active_dwell_time(struct iwl_priv *priv, 290 enum ieee80211_band band, 291 u8 n_probes) 292{ 293 if (band == IEEE80211_BAND_5GHZ) 294 return IWL_ACTIVE_DWELL_TIME_52 + 295 IWL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1); 296 else 297 return IWL_ACTIVE_DWELL_TIME_24 + 298 IWL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1); 299} 300EXPORT_SYMBOL(iwl_get_active_dwell_time); 301 302u16 iwl_get_passive_dwell_time(struct iwl_priv *priv, 303 enum ieee80211_band band) 304{ 305 u16 passive = (band == IEEE80211_BAND_2GHZ) ? 306 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 : 307 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52; 308 309 if (iwl_is_associated(priv)) { 310 /* If we're associated, we clamp the maximum passive 311 * dwell time to be 98% of the beacon interval (minus 312 * 2 * channel tune time) */ 313 passive = priv->beacon_int; 314 if ((passive > IWL_PASSIVE_DWELL_BASE) || !passive) 315 passive = IWL_PASSIVE_DWELL_BASE; 316 passive = (passive * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2; 317 } 318 319 return passive; 320} 321EXPORT_SYMBOL(iwl_get_passive_dwell_time); 322 323static int iwl_get_channels_for_scan(struct iwl_priv *priv, 324 enum ieee80211_band band, 325 u8 is_active, u8 n_probes, 326 struct iwl_scan_channel *scan_ch) 327{ 328 const struct ieee80211_channel *channels = NULL; 329 const struct ieee80211_supported_band *sband; 330 const struct iwl_channel_info *ch_info; 331 u16 passive_dwell = 0; 332 u16 active_dwell = 0; 333 int added, i; 334 u16 channel; 335 336 sband = iwl_get_hw_mode(priv, band); 337 if (!sband) 338 return 0; 339 340 channels = sband->channels; 341 342 active_dwell = iwl_get_active_dwell_time(priv, band, n_probes); 343 passive_dwell = iwl_get_passive_dwell_time(priv, band); 344 345 if (passive_dwell <= active_dwell) 346 passive_dwell = active_dwell + 1; 347 348 for (i = 0, added = 0; i < sband->n_channels; i++) { 349 if (channels[i].flags & IEEE80211_CHAN_DISABLED) 350 continue; 351 352 channel = 353 ieee80211_frequency_to_channel(channels[i].center_freq); 354 scan_ch->channel = cpu_to_le16(channel); 355 356 ch_info = iwl_get_channel_info(priv, band, channel); 357 if (!is_channel_valid(ch_info)) { 358 IWL_DEBUG_SCAN("Channel %d is INVALID for this band.\n", 359 channel); 360 continue; 361 } 362 363 if (!is_active || is_channel_passive(ch_info) || 364 (channels[i].flags & IEEE80211_CHAN_PASSIVE_SCAN)) 365 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE; 366 else 367 scan_ch->type = SCAN_CHANNEL_TYPE_ACTIVE; 368 369 if (n_probes) 370 scan_ch->type |= IWL_SCAN_PROBE_MASK(n_probes); 371 372 scan_ch->active_dwell = cpu_to_le16(active_dwell); 373 scan_ch->passive_dwell = cpu_to_le16(passive_dwell); 374 375 /* Set txpower levels to defaults */ 376 scan_ch->dsp_atten = 110; 377 378 /* NOTE: if we were doing 6Mb OFDM for scans we'd use 379 * power level: 380 * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3; 381 */ 382 if (band == IEEE80211_BAND_5GHZ) 383 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3; 384 else 385 scan_ch->tx_gain = ((1 << 5) | (5 << 3)); 386 387 IWL_DEBUG_SCAN("Scanning ch=%d prob=0x%X [%s %d]\n", 388 channel, le32_to_cpu(scan_ch->type), 389 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ? 390 "ACTIVE" : "PASSIVE", 391 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ? 392 active_dwell : passive_dwell); 393 394 scan_ch++; 395 added++; 396 } 397 398 IWL_DEBUG_SCAN("total channels to scan %d \n", added); 399 return added; 400} 401 402void iwl_init_scan_params(struct iwl_priv *priv) 403{ 404 u8 ant_idx = fls(priv->hw_params.valid_tx_ant) - 1; 405 if (!priv->scan_tx_ant[IEEE80211_BAND_5GHZ]) 406 priv->scan_tx_ant[IEEE80211_BAND_5GHZ] = ant_idx; 407 if (!priv->scan_tx_ant[IEEE80211_BAND_2GHZ]) 408 priv->scan_tx_ant[IEEE80211_BAND_2GHZ] = ant_idx; 409} 410 411int iwl_scan_initiate(struct iwl_priv *priv) 412{ 413 if (!iwl_is_ready_rf(priv)) { 414 IWL_DEBUG_SCAN("Aborting scan due to not ready.\n"); 415 return -EIO; 416 } 417 418 if (test_bit(STATUS_SCANNING, &priv->status)) { 419 IWL_DEBUG_SCAN("Scan already in progress.\n"); 420 return -EAGAIN; 421 } 422 423 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) { 424 IWL_DEBUG_SCAN("Scan request while abort pending\n"); 425 return -EAGAIN; 426 } 427 428 IWL_DEBUG_INFO("Starting scan...\n"); 429 if (priv->cfg->sku & IWL_SKU_G) 430 priv->scan_bands |= BIT(IEEE80211_BAND_2GHZ); 431 if (priv->cfg->sku & IWL_SKU_A) 432 priv->scan_bands |= BIT(IEEE80211_BAND_5GHZ); 433 set_bit(STATUS_SCANNING, &priv->status); 434 priv->scan_start = jiffies; 435 priv->scan_pass_start = priv->scan_start; 436 437 queue_work(priv->workqueue, &priv->request_scan); 438 439 return 0; 440} 441EXPORT_SYMBOL(iwl_scan_initiate); 442 443#define IWL_SCAN_CHECK_WATCHDOG (7 * HZ) 444 445void iwl_bg_scan_check(struct work_struct *data) 446{ 447 struct iwl_priv *priv = 448 container_of(data, struct iwl_priv, scan_check.work); 449 450 if (test_bit(STATUS_EXIT_PENDING, &priv->status)) 451 return; 452 453 mutex_lock(&priv->mutex); 454 if (test_bit(STATUS_SCANNING, &priv->status) || 455 test_bit(STATUS_SCAN_ABORTING, &priv->status)) { 456 IWL_DEBUG(IWL_DL_SCAN, "Scan completion watchdog resetting " 457 "adapter (%dms)\n", 458 jiffies_to_msecs(IWL_SCAN_CHECK_WATCHDOG)); 459 460 if (!test_bit(STATUS_EXIT_PENDING, &priv->status)) 461 iwl_send_scan_abort(priv); 462 } 463 mutex_unlock(&priv->mutex); 464} 465EXPORT_SYMBOL(iwl_bg_scan_check); 466 467/** 468 * iwl_supported_rate_to_ie - fill in the supported rate in IE field 469 * 470 * return : set the bit for each supported rate insert in ie 471 */ 472static u16 iwl_supported_rate_to_ie(u8 *ie, u16 supported_rate, 473 u16 basic_rate, int *left) 474{ 475 u16 ret_rates = 0, bit; 476 int i; 477 u8 *cnt = ie; 478 u8 *rates = ie + 1; 479 480 for (bit = 1, i = 0; i < IWL_RATE_COUNT; i++, bit <<= 1) { 481 if (bit & supported_rate) { 482 ret_rates |= bit; 483 rates[*cnt] = iwl_rates[i].ieee | 484 ((bit & basic_rate) ? 0x80 : 0x00); 485 (*cnt)++; 486 (*left)--; 487 if ((*left <= 0) || 488 (*cnt >= IWL_SUPPORTED_RATES_IE_LEN)) 489 break; 490 } 491 } 492 493 return ret_rates; 494} 495 496 497static void iwl_ht_cap_to_ie(const struct ieee80211_supported_band *sband, 498 u8 *pos, int *left) 499{ 500 struct ieee80211_ht_cap *ht_cap; 501 502 if (!sband || !sband->ht_cap.ht_supported) 503 return; 504 505 if (*left < sizeof(struct ieee80211_ht_cap)) 506 return; 507 508 *pos++ = sizeof(struct ieee80211_ht_cap); 509 ht_cap = (struct ieee80211_ht_cap *) pos; 510 511 ht_cap->cap_info = cpu_to_le16(sband->ht_cap.cap); 512 memcpy(&ht_cap->mcs, &sband->ht_cap.mcs, 16); 513 ht_cap->ampdu_params_info = 514 (sband->ht_cap.ampdu_factor & IEEE80211_HT_AMPDU_PARM_FACTOR) | 515 ((sband->ht_cap.ampdu_density << 2) & 516 IEEE80211_HT_AMPDU_PARM_DENSITY); 517 *left -= sizeof(struct ieee80211_ht_cap); 518} 519 520/** 521 * iwl_fill_probe_req - fill in all required fields and IE for probe request 522 */ 523 524u16 iwl_fill_probe_req(struct iwl_priv *priv, 525 enum ieee80211_band band, 526 struct ieee80211_mgmt *frame, 527 int left) 528{ 529 int len = 0; 530 u8 *pos = NULL; 531 u16 active_rates, ret_rates, cck_rates, active_rate_basic; 532 const struct ieee80211_supported_band *sband = 533 iwl_get_hw_mode(priv, band); 534 535 536 /* Make sure there is enough space for the probe request, 537 * two mandatory IEs and the data */ 538 left -= 24; 539 if (left < 0) 540 return 0; 541 542 frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ); 543 memcpy(frame->da, iwl_bcast_addr, ETH_ALEN); 544 memcpy(frame->sa, priv->mac_addr, ETH_ALEN); 545 memcpy(frame->bssid, iwl_bcast_addr, ETH_ALEN); 546 frame->seq_ctrl = 0; 547 548 len += 24; 549 550 /* ...next IE... */ 551 pos = &frame->u.probe_req.variable[0]; 552 553 /* fill in our indirect SSID IE */ 554 left -= 2; 555 if (left < 0) 556 return 0; 557 *pos++ = WLAN_EID_SSID; 558 *pos++ = 0; 559 560 len += 2; 561 562 /* fill in supported rate */ 563 left -= 2; 564 if (left < 0) 565 return 0; 566 567 *pos++ = WLAN_EID_SUPP_RATES; 568 *pos = 0; 569 570 /* exclude 60M rate */ 571 active_rates = priv->rates_mask; 572 active_rates &= ~IWL_RATE_60M_MASK; 573 574 active_rate_basic = active_rates & IWL_BASIC_RATES_MASK; 575 576 cck_rates = IWL_CCK_RATES_MASK & active_rates; 577 ret_rates = iwl_supported_rate_to_ie(pos, cck_rates, 578 active_rate_basic, &left); 579 active_rates &= ~ret_rates; 580 581 ret_rates = iwl_supported_rate_to_ie(pos, active_rates, 582 active_rate_basic, &left); 583 active_rates &= ~ret_rates; 584 585 len += 2 + *pos; 586 pos += (*pos) + 1; 587 588 if (active_rates == 0) 589 goto fill_end; 590 591 /* fill in supported extended rate */ 592 /* ...next IE... */ 593 left -= 2; 594 if (left < 0) 595 return 0; 596 /* ... fill it in... */ 597 *pos++ = WLAN_EID_EXT_SUPP_RATES; 598 *pos = 0; 599 iwl_supported_rate_to_ie(pos, active_rates, active_rate_basic, &left); 600 if (*pos > 0) { 601 len += 2 + *pos; 602 pos += (*pos) + 1; 603 } else { 604 pos--; 605 } 606 607 fill_end: 608 609 left -= 2; 610 if (left < 0) 611 return 0; 612 613 *pos++ = WLAN_EID_HT_CAPABILITY; 614 *pos = 0; 615 iwl_ht_cap_to_ie(sband, pos, &left); 616 if (*pos > 0) 617 len += 2 + *pos; 618 619 return (u16)len; 620} 621EXPORT_SYMBOL(iwl_fill_probe_req); 622 623static void iwl_bg_request_scan(struct work_struct *data) 624{ 625 struct iwl_priv *priv = 626 container_of(data, struct iwl_priv, request_scan); 627 struct iwl_host_cmd cmd = { 628 .id = REPLY_SCAN_CMD, 629 .len = sizeof(struct iwl_scan_cmd), 630 .meta.flags = CMD_SIZE_HUGE, 631 }; 632 struct iwl_scan_cmd *scan; 633 struct ieee80211_conf *conf = NULL; 634 int ret = 0; 635 u32 rate_flags = 0; 636 u16 cmd_len; 637 enum ieee80211_band band; 638 u8 n_probes = 2; 639 u8 rx_chain = priv->hw_params.valid_rx_ant; 640 u8 rate; 641 DECLARE_SSID_BUF(ssid); 642 643 conf = ieee80211_get_hw_conf(priv->hw); 644 645 mutex_lock(&priv->mutex); 646 647 if (!iwl_is_ready(priv)) { 648 IWL_WARN(priv, "request scan called when driver not ready.\n"); 649 goto done; 650 } 651 652 /* Make sure the scan wasn't canceled before this queued work 653 * was given the chance to run... */ 654 if (!test_bit(STATUS_SCANNING, &priv->status)) 655 goto done; 656 657 /* This should never be called or scheduled if there is currently 658 * a scan active in the hardware. */ 659 if (test_bit(STATUS_SCAN_HW, &priv->status)) { 660 IWL_DEBUG_INFO("Multiple concurrent scan requests in parallel. " 661 "Ignoring second request.\n"); 662 ret = -EIO; 663 goto done; 664 } 665 666 if (test_bit(STATUS_EXIT_PENDING, &priv->status)) { 667 IWL_DEBUG_SCAN("Aborting scan due to device shutdown\n"); 668 goto done; 669 } 670 671 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) { 672 IWL_DEBUG_HC("Scan request while abort pending. Queuing.\n"); 673 goto done; 674 } 675 676 if (iwl_is_rfkill(priv)) { 677 IWL_DEBUG_HC("Aborting scan due to RF Kill activation\n"); 678 goto done; 679 } 680 681 if (!test_bit(STATUS_READY, &priv->status)) { 682 IWL_DEBUG_HC("Scan request while uninitialized. Queuing.\n"); 683 goto done; 684 } 685 686 if (!priv->scan_bands) { 687 IWL_DEBUG_HC("Aborting scan due to no requested bands\n"); 688 goto done; 689 } 690 691 if (!priv->scan) { 692 priv->scan = kmalloc(sizeof(struct iwl_scan_cmd) + 693 IWL_MAX_SCAN_SIZE, GFP_KERNEL); 694 if (!priv->scan) { 695 ret = -ENOMEM; 696 goto done; 697 } 698 } 699 scan = priv->scan; 700 memset(scan, 0, sizeof(struct iwl_scan_cmd) + IWL_MAX_SCAN_SIZE); 701 702 scan->quiet_plcp_th = IWL_PLCP_QUIET_THRESH; 703 scan->quiet_time = IWL_ACTIVE_QUIET_TIME; 704 705 if (iwl_is_associated(priv)) { 706 u16 interval = 0; 707 u32 extra; 708 u32 suspend_time = 100; 709 u32 scan_suspend_time = 100; 710 unsigned long flags; 711 712 IWL_DEBUG_INFO("Scanning while associated...\n"); 713 714 spin_lock_irqsave(&priv->lock, flags); 715 interval = priv->beacon_int; 716 spin_unlock_irqrestore(&priv->lock, flags); 717 718 scan->suspend_time = 0; 719 scan->max_out_time = cpu_to_le32(200 * 1024); 720 if (!interval) 721 interval = suspend_time; 722 723 extra = (suspend_time / interval) << 22; 724 scan_suspend_time = (extra | 725 ((suspend_time % interval) * 1024)); 726 scan->suspend_time = cpu_to_le32(scan_suspend_time); 727 IWL_DEBUG_SCAN("suspend_time 0x%X beacon interval %d\n", 728 scan_suspend_time, interval); 729 } 730 731 /* We should add the ability for user to lock to PASSIVE ONLY */ 732 if (priv->one_direct_scan) { 733 IWL_DEBUG_SCAN("Start direct scan for '%s'\n", 734 print_ssid(ssid, priv->direct_ssid, 735 priv->direct_ssid_len)); 736 scan->direct_scan[0].id = WLAN_EID_SSID; 737 scan->direct_scan[0].len = priv->direct_ssid_len; 738 memcpy(scan->direct_scan[0].ssid, 739 priv->direct_ssid, priv->direct_ssid_len); 740 n_probes++; 741 } else { 742 IWL_DEBUG_SCAN("Start indirect scan.\n"); 743 } 744 745 scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK; 746 scan->tx_cmd.sta_id = priv->hw_params.bcast_sta_id; 747 scan->tx_cmd.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE; 748 749 750 if (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ)) { 751 band = IEEE80211_BAND_2GHZ; 752 scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK; 753 if (priv->active_rxon.flags & RXON_FLG_CHANNEL_MODE_PURE_40_MSK) { 754 rate = IWL_RATE_6M_PLCP; 755 } else { 756 rate = IWL_RATE_1M_PLCP; 757 rate_flags = RATE_MCS_CCK_MSK; 758 } 759 scan->good_CRC_th = 0; 760 } else if (priv->scan_bands & BIT(IEEE80211_BAND_5GHZ)) { 761 band = IEEE80211_BAND_5GHZ; 762 rate = IWL_RATE_6M_PLCP; 763 scan->good_CRC_th = IWL_GOOD_CRC_TH; 764 765 /* Force use of chains B and C (0x6) for scan Rx for 4965 766 * Avoid A (0x1) because of its off-channel reception on A-band. 767 */ 768 if ((priv->hw_rev & CSR_HW_REV_TYPE_MSK) == CSR_HW_REV_TYPE_4965) 769 rx_chain = 0x6; 770 } else { 771 IWL_WARN(priv, "Invalid scan band count\n"); 772 goto done; 773 } 774 775 priv->scan_tx_ant[band] = 776 iwl_toggle_tx_ant(priv, priv->scan_tx_ant[band]); 777 rate_flags |= iwl_ant_idx_to_flags(priv->scan_tx_ant[band]); 778 scan->tx_cmd.rate_n_flags = iwl_hw_set_rate_n_flags(rate, rate_flags); 779 780 /* MIMO is not used here, but value is required */ 781 scan->rx_chain = RXON_RX_CHAIN_DRIVER_FORCE_MSK | 782 cpu_to_le16((0x7 << RXON_RX_CHAIN_VALID_POS) | 783 (rx_chain << RXON_RX_CHAIN_FORCE_SEL_POS) | 784 (0x7 << RXON_RX_CHAIN_FORCE_MIMO_SEL_POS)); 785 786 cmd_len = iwl_fill_probe_req(priv, band, 787 (struct ieee80211_mgmt *)scan->data, 788 IWL_MAX_SCAN_SIZE - sizeof(*scan)); 789 790 scan->tx_cmd.len = cpu_to_le16(cmd_len); 791 792 if (priv->iw_mode == NL80211_IFTYPE_MONITOR) 793 scan->filter_flags = RXON_FILTER_PROMISC_MSK; 794 795 scan->filter_flags |= (RXON_FILTER_ACCEPT_GRP_MSK | 796 RXON_FILTER_BCON_AWARE_MSK); 797 798 scan->channel_count = 799 iwl_get_channels_for_scan(priv, band, 1, /* active */ 800 n_probes, 801 (void *)&scan->data[le16_to_cpu(scan->tx_cmd.len)]); 802 803 if (scan->channel_count == 0) { 804 IWL_DEBUG_SCAN("channel count %d\n", scan->channel_count); 805 goto done; 806 } 807 808 cmd.len += le16_to_cpu(scan->tx_cmd.len) + 809 scan->channel_count * sizeof(struct iwl_scan_channel); 810 cmd.data = scan; 811 scan->len = cpu_to_le16(cmd.len); 812 813 set_bit(STATUS_SCAN_HW, &priv->status); 814 ret = iwl_send_cmd_sync(priv, &cmd); 815 if (ret) 816 goto done; 817 818 queue_delayed_work(priv->workqueue, &priv->scan_check, 819 IWL_SCAN_CHECK_WATCHDOG); 820 821 mutex_unlock(&priv->mutex); 822 return; 823 824 done: 825 /* Cannot perform scan. Make sure we clear scanning 826 * bits from status so next scan request can be performed. 827 * If we don't clear scanning status bit here all next scan 828 * will fail 829 */ 830 clear_bit(STATUS_SCAN_HW, &priv->status); 831 clear_bit(STATUS_SCANNING, &priv->status); 832 /* inform mac80211 scan aborted */ 833 queue_work(priv->workqueue, &priv->scan_completed); 834 mutex_unlock(&priv->mutex); 835} 836 837void iwl_bg_abort_scan(struct work_struct *work) 838{ 839 struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan); 840 841 if (!iwl_is_ready(priv)) 842 return; 843 844 mutex_lock(&priv->mutex); 845 846 set_bit(STATUS_SCAN_ABORTING, &priv->status); 847 iwl_send_scan_abort(priv); 848 849 mutex_unlock(&priv->mutex); 850} 851EXPORT_SYMBOL(iwl_bg_abort_scan); 852 853void iwl_bg_scan_completed(struct work_struct *work) 854{ 855 struct iwl_priv *priv = 856 container_of(work, struct iwl_priv, scan_completed); 857 858 IWL_DEBUG_SCAN("SCAN complete scan\n"); 859 860 if (test_bit(STATUS_EXIT_PENDING, &priv->status)) 861 return; 862 863 ieee80211_scan_completed(priv->hw); 864 865 /* Since setting the TXPOWER may have been deferred while 866 * performing the scan, fire one off */ 867 mutex_lock(&priv->mutex); 868 iwl_set_tx_power(priv, priv->tx_power_user_lmt, true); 869 mutex_unlock(&priv->mutex); 870} 871EXPORT_SYMBOL(iwl_bg_scan_completed); 872 873void iwl_setup_scan_deferred_work(struct iwl_priv *priv) 874{ 875 INIT_WORK(&priv->scan_completed, iwl_bg_scan_completed); 876 INIT_WORK(&priv->request_scan, iwl_bg_request_scan); 877 INIT_WORK(&priv->abort_scan, iwl_bg_abort_scan); 878 INIT_DELAYED_WORK(&priv->scan_check, iwl_bg_scan_check); 879} 880EXPORT_SYMBOL(iwl_setup_scan_deferred_work); 881 882