1/****************************************************************************** 2 * 3 * GPL LICENSE SUMMARY 4 * 5 * Copyright(c) 2008 - 2012 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/slab.h> 29#include <linux/types.h> 30#include <linux/etherdevice.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-io.h" 37#include "iwl-agn.h" 38#include "iwl-trans.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 57static int iwl_send_scan_abort(struct iwl_priv *priv) 58{ 59 int ret; 60 struct iwl_host_cmd cmd = { 61 .id = REPLY_SCAN_ABORT_CMD, 62 .flags = CMD_SYNC | CMD_WANT_SKB, 63 }; 64 __le32 *status; 65 66 /* Exit instantly with error when device is not ready 67 * to receive scan abort command or it does not perform 68 * hardware scan currently */ 69 if (!test_bit(STATUS_READY, &priv->status) || 70 !test_bit(STATUS_GEO_CONFIGURED, &priv->status) || 71 !test_bit(STATUS_SCAN_HW, &priv->status) || 72 test_bit(STATUS_FW_ERROR, &priv->shrd->status)) 73 return -EIO; 74 75 ret = iwl_dvm_send_cmd(priv, &cmd); 76 if (ret) 77 return ret; 78 79 status = (void *)cmd.resp_pkt->data; 80 if (*status != CAN_ABORT_STATUS) { 81 /* The scan abort will return 1 for success or 82 * 2 for "failure". A failure condition can be 83 * due to simply not being in an active scan which 84 * can occur if we send the scan abort before we 85 * the microcode has notified us that a scan is 86 * completed. */ 87 IWL_DEBUG_SCAN(priv, "SCAN_ABORT ret %d.\n", 88 le32_to_cpu(*status)); 89 ret = -EIO; 90 } 91 92 iwl_free_resp(&cmd); 93 return ret; 94} 95 96static void iwl_complete_scan(struct iwl_priv *priv, bool aborted) 97{ 98 /* check if scan was requested from mac80211 */ 99 if (priv->scan_request) { 100 IWL_DEBUG_SCAN(priv, "Complete scan in mac80211\n"); 101 ieee80211_scan_completed(priv->hw, aborted); 102 } 103 104 if (priv->scan_type == IWL_SCAN_ROC) { 105 ieee80211_remain_on_channel_expired(priv->hw); 106 priv->hw_roc_channel = NULL; 107 schedule_delayed_work(&priv->hw_roc_disable_work, 10 * HZ); 108 } 109 110 priv->scan_type = IWL_SCAN_NORMAL; 111 priv->scan_vif = NULL; 112 priv->scan_request = NULL; 113} 114 115static void iwl_process_scan_complete(struct iwl_priv *priv) 116{ 117 bool aborted; 118 119 lockdep_assert_held(&priv->mutex); 120 121 if (!test_and_clear_bit(STATUS_SCAN_COMPLETE, &priv->status)) 122 return; 123 124 IWL_DEBUG_SCAN(priv, "Completed scan.\n"); 125 126 cancel_delayed_work(&priv->scan_check); 127 128 aborted = test_and_clear_bit(STATUS_SCAN_ABORTING, &priv->status); 129 if (aborted) 130 IWL_DEBUG_SCAN(priv, "Aborted scan completed.\n"); 131 132 if (!test_and_clear_bit(STATUS_SCANNING, &priv->status)) { 133 IWL_DEBUG_SCAN(priv, "Scan already completed.\n"); 134 goto out_settings; 135 } 136 137 if (priv->scan_type == IWL_SCAN_ROC) { 138 ieee80211_remain_on_channel_expired(priv->hw); 139 priv->hw_roc_channel = NULL; 140 schedule_delayed_work(&priv->hw_roc_disable_work, 10 * HZ); 141 } 142 143 if (priv->scan_type != IWL_SCAN_NORMAL && !aborted) { 144 int err; 145 146 /* Check if mac80211 requested scan during our internal scan */ 147 if (priv->scan_request == NULL) 148 goto out_complete; 149 150 /* If so request a new scan */ 151 err = iwl_scan_initiate(priv, priv->scan_vif, IWL_SCAN_NORMAL, 152 priv->scan_request->channels[0]->band); 153 if (err) { 154 IWL_DEBUG_SCAN(priv, 155 "failed to initiate pending scan: %d\n", err); 156 aborted = true; 157 goto out_complete; 158 } 159 160 return; 161 } 162 163out_complete: 164 iwl_complete_scan(priv, aborted); 165 166out_settings: 167 /* Can we still talk to firmware ? */ 168 if (!iwl_is_ready_rf(priv)) 169 return; 170 171 iwlagn_post_scan(priv); 172} 173 174void iwl_force_scan_end(struct iwl_priv *priv) 175{ 176 lockdep_assert_held(&priv->mutex); 177 178 if (!test_bit(STATUS_SCANNING, &priv->status)) { 179 IWL_DEBUG_SCAN(priv, "Forcing scan end while not scanning\n"); 180 return; 181 } 182 183 IWL_DEBUG_SCAN(priv, "Forcing scan end\n"); 184 clear_bit(STATUS_SCANNING, &priv->status); 185 clear_bit(STATUS_SCAN_HW, &priv->status); 186 clear_bit(STATUS_SCAN_ABORTING, &priv->status); 187 clear_bit(STATUS_SCAN_COMPLETE, &priv->status); 188 iwl_complete_scan(priv, true); 189} 190 191static void iwl_do_scan_abort(struct iwl_priv *priv) 192{ 193 int ret; 194 195 lockdep_assert_held(&priv->mutex); 196 197 if (!test_bit(STATUS_SCANNING, &priv->status)) { 198 IWL_DEBUG_SCAN(priv, "Not performing scan to abort\n"); 199 return; 200 } 201 202 if (test_and_set_bit(STATUS_SCAN_ABORTING, &priv->status)) { 203 IWL_DEBUG_SCAN(priv, "Scan abort in progress\n"); 204 return; 205 } 206 207 ret = iwl_send_scan_abort(priv); 208 if (ret) { 209 IWL_DEBUG_SCAN(priv, "Send scan abort failed %d\n", ret); 210 iwl_force_scan_end(priv); 211 } else 212 IWL_DEBUG_SCAN(priv, "Successfully send scan abort\n"); 213} 214 215/** 216 * iwl_scan_cancel - Cancel any currently executing HW scan 217 */ 218int iwl_scan_cancel(struct iwl_priv *priv) 219{ 220 IWL_DEBUG_SCAN(priv, "Queuing abort scan\n"); 221 queue_work(priv->workqueue, &priv->abort_scan); 222 return 0; 223} 224 225/** 226 * iwl_scan_cancel_timeout - Cancel any currently executing HW scan 227 * @ms: amount of time to wait (in milliseconds) for scan to abort 228 * 229 */ 230void iwl_scan_cancel_timeout(struct iwl_priv *priv, unsigned long ms) 231{ 232 unsigned long timeout = jiffies + msecs_to_jiffies(ms); 233 234 lockdep_assert_held(&priv->mutex); 235 236 IWL_DEBUG_SCAN(priv, "Scan cancel timeout\n"); 237 238 iwl_do_scan_abort(priv); 239 240 while (time_before_eq(jiffies, timeout)) { 241 if (!test_bit(STATUS_SCAN_HW, &priv->status)) 242 goto finished; 243 msleep(20); 244 } 245 246 return; 247 248 finished: 249 /* 250 * Now STATUS_SCAN_HW is clear. This means that the 251 * device finished, but the background work is going 252 * to execute at best as soon as we release the mutex. 253 * Since we need to be able to issue a new scan right 254 * after this function returns, run the complete here. 255 * The STATUS_SCAN_COMPLETE bit will then be cleared 256 * and prevent the background work from "completing" 257 * a possible new scan. 258 */ 259 iwl_process_scan_complete(priv); 260} 261 262/* Service response to REPLY_SCAN_CMD (0x80) */ 263static int iwl_rx_reply_scan(struct iwl_priv *priv, 264 struct iwl_rx_cmd_buffer *rxb, 265 struct iwl_device_cmd *cmd) 266{ 267#ifdef CONFIG_IWLWIFI_DEBUG 268 struct iwl_rx_packet *pkt = rxb_addr(rxb); 269 struct iwl_scanreq_notification *notif = (void *)pkt->data; 270 271 IWL_DEBUG_SCAN(priv, "Scan request status = 0x%x\n", notif->status); 272#endif 273 return 0; 274} 275 276/* Service SCAN_START_NOTIFICATION (0x82) */ 277static int iwl_rx_scan_start_notif(struct iwl_priv *priv, 278 struct iwl_rx_cmd_buffer *rxb, 279 struct iwl_device_cmd *cmd) 280{ 281 struct iwl_rx_packet *pkt = rxb_addr(rxb); 282 struct iwl_scanstart_notification *notif = (void *)pkt->data; 283 284 priv->scan_start_tsf = le32_to_cpu(notif->tsf_low); 285 IWL_DEBUG_SCAN(priv, "Scan start: " 286 "%d [802.11%s] " 287 "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n", 288 notif->channel, 289 notif->band ? "bg" : "a", 290 le32_to_cpu(notif->tsf_high), 291 le32_to_cpu(notif->tsf_low), 292 notif->status, notif->beacon_timer); 293 294 if (priv->scan_type == IWL_SCAN_ROC && 295 !priv->hw_roc_start_notified) { 296 ieee80211_ready_on_channel(priv->hw); 297 priv->hw_roc_start_notified = true; 298 } 299 300 return 0; 301} 302 303/* Service SCAN_RESULTS_NOTIFICATION (0x83) */ 304static int iwl_rx_scan_results_notif(struct iwl_priv *priv, 305 struct iwl_rx_cmd_buffer *rxb, 306 struct iwl_device_cmd *cmd) 307{ 308#ifdef CONFIG_IWLWIFI_DEBUG 309 struct iwl_rx_packet *pkt = rxb_addr(rxb); 310 struct iwl_scanresults_notification *notif = (void *)pkt->data; 311 312 IWL_DEBUG_SCAN(priv, "Scan ch.res: " 313 "%d [802.11%s] " 314 "probe status: %u:%u " 315 "(TSF: 0x%08X:%08X) - %d " 316 "elapsed=%lu usec\n", 317 notif->channel, 318 notif->band ? "bg" : "a", 319 notif->probe_status, notif->num_probe_not_sent, 320 le32_to_cpu(notif->tsf_high), 321 le32_to_cpu(notif->tsf_low), 322 le32_to_cpu(notif->statistics[0]), 323 le32_to_cpu(notif->tsf_low) - priv->scan_start_tsf); 324#endif 325 return 0; 326} 327 328/* Service SCAN_COMPLETE_NOTIFICATION (0x84) */ 329static int iwl_rx_scan_complete_notif(struct iwl_priv *priv, 330 struct iwl_rx_cmd_buffer *rxb, 331 struct iwl_device_cmd *cmd) 332{ 333 struct iwl_rx_packet *pkt = rxb_addr(rxb); 334 struct iwl_scancomplete_notification *scan_notif = (void *)pkt->data; 335 336 IWL_DEBUG_SCAN(priv, "Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n", 337 scan_notif->scanned_channels, 338 scan_notif->tsf_low, 339 scan_notif->tsf_high, scan_notif->status); 340 341 IWL_DEBUG_SCAN(priv, "Scan on %sGHz took %dms\n", 342 (priv->scan_band == IEEE80211_BAND_2GHZ) ? "2.4" : "5.2", 343 jiffies_to_msecs(jiffies - priv->scan_start)); 344 345 /* 346 * When aborting, we run the scan completed background work inline 347 * and the background work must then do nothing. The SCAN_COMPLETE 348 * bit helps implement that logic and thus needs to be set before 349 * queueing the work. Also, since the scan abort waits for SCAN_HW 350 * to clear, we need to set SCAN_COMPLETE before clearing SCAN_HW 351 * to avoid a race there. 352 */ 353 set_bit(STATUS_SCAN_COMPLETE, &priv->status); 354 clear_bit(STATUS_SCAN_HW, &priv->status); 355 queue_work(priv->workqueue, &priv->scan_completed); 356 357 if (priv->iw_mode != NL80211_IFTYPE_ADHOC && 358 iwl_advanced_bt_coexist(priv) && 359 priv->bt_status != scan_notif->bt_status) { 360 if (scan_notif->bt_status) { 361 /* BT on */ 362 if (!priv->bt_ch_announce) 363 priv->bt_traffic_load = 364 IWL_BT_COEX_TRAFFIC_LOAD_HIGH; 365 /* 366 * otherwise, no traffic load information provided 367 * no changes made 368 */ 369 } else { 370 /* BT off */ 371 priv->bt_traffic_load = 372 IWL_BT_COEX_TRAFFIC_LOAD_NONE; 373 } 374 priv->bt_status = scan_notif->bt_status; 375 queue_work(priv->workqueue, 376 &priv->bt_traffic_change_work); 377 } 378 return 0; 379} 380 381void iwl_setup_rx_scan_handlers(struct iwl_priv *priv) 382{ 383 /* scan handlers */ 384 priv->rx_handlers[REPLY_SCAN_CMD] = iwl_rx_reply_scan; 385 priv->rx_handlers[SCAN_START_NOTIFICATION] = iwl_rx_scan_start_notif; 386 priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] = 387 iwl_rx_scan_results_notif; 388 priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] = 389 iwl_rx_scan_complete_notif; 390} 391 392static u16 iwl_get_active_dwell_time(struct iwl_priv *priv, 393 enum ieee80211_band band, u8 n_probes) 394{ 395 if (band == IEEE80211_BAND_5GHZ) 396 return IWL_ACTIVE_DWELL_TIME_52 + 397 IWL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1); 398 else 399 return IWL_ACTIVE_DWELL_TIME_24 + 400 IWL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1); 401} 402 403static u16 iwl_limit_dwell(struct iwl_priv *priv, u16 dwell_time) 404{ 405 struct iwl_rxon_context *ctx; 406 407 /* 408 * If we're associated, we clamp the dwell time 98% 409 * of the smallest beacon interval (minus 2 * channel 410 * tune time) 411 */ 412 for_each_context(priv, ctx) { 413 u16 value; 414 415 switch (ctx->staging.dev_type) { 416 case RXON_DEV_TYPE_P2P: 417 /* no timing constraints */ 418 continue; 419 case RXON_DEV_TYPE_ESS: 420 default: 421 /* timing constraints if associated */ 422 if (!iwl_is_associated_ctx(ctx)) 423 continue; 424 break; 425 case RXON_DEV_TYPE_CP: 426 case RXON_DEV_TYPE_2STA: 427 /* 428 * These seem to always have timers for TBTT 429 * active in uCode even when not associated yet. 430 */ 431 break; 432 } 433 434 value = ctx->beacon_int; 435 if (!value) 436 value = IWL_PASSIVE_DWELL_BASE; 437 value = (value * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2; 438 dwell_time = min(value, dwell_time); 439 } 440 441 return dwell_time; 442} 443 444static u16 iwl_get_passive_dwell_time(struct iwl_priv *priv, 445 enum ieee80211_band band) 446{ 447 u16 passive = (band == IEEE80211_BAND_2GHZ) ? 448 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 : 449 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52; 450 451 return iwl_limit_dwell(priv, passive); 452} 453 454static int iwl_get_single_channel_for_scan(struct iwl_priv *priv, 455 struct ieee80211_vif *vif, 456 enum ieee80211_band band, 457 struct iwl_scan_channel *scan_ch) 458{ 459 const struct ieee80211_supported_band *sband; 460 u16 passive_dwell = 0; 461 u16 active_dwell = 0; 462 int added = 0; 463 u16 channel = 0; 464 465 sband = iwl_get_hw_mode(priv, band); 466 if (!sband) { 467 IWL_ERR(priv, "invalid band\n"); 468 return added; 469 } 470 471 active_dwell = iwl_get_active_dwell_time(priv, band, 0); 472 passive_dwell = iwl_get_passive_dwell_time(priv, band); 473 474 if (passive_dwell <= active_dwell) 475 passive_dwell = active_dwell + 1; 476 477 channel = iwl_get_single_channel_number(priv, band); 478 if (channel) { 479 scan_ch->channel = cpu_to_le16(channel); 480 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE; 481 scan_ch->active_dwell = cpu_to_le16(active_dwell); 482 scan_ch->passive_dwell = cpu_to_le16(passive_dwell); 483 /* Set txpower levels to defaults */ 484 scan_ch->dsp_atten = 110; 485 if (band == IEEE80211_BAND_5GHZ) 486 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3; 487 else 488 scan_ch->tx_gain = ((1 << 5) | (5 << 3)); 489 added++; 490 } else 491 IWL_ERR(priv, "no valid channel found\n"); 492 return added; 493} 494 495static int iwl_get_channels_for_scan(struct iwl_priv *priv, 496 struct ieee80211_vif *vif, 497 enum ieee80211_band band, 498 u8 is_active, u8 n_probes, 499 struct iwl_scan_channel *scan_ch) 500{ 501 struct ieee80211_channel *chan; 502 const struct ieee80211_supported_band *sband; 503 const struct iwl_channel_info *ch_info; 504 u16 passive_dwell = 0; 505 u16 active_dwell = 0; 506 int added, i; 507 u16 channel; 508 509 sband = iwl_get_hw_mode(priv, band); 510 if (!sband) 511 return 0; 512 513 active_dwell = iwl_get_active_dwell_time(priv, band, n_probes); 514 passive_dwell = iwl_get_passive_dwell_time(priv, band); 515 516 if (passive_dwell <= active_dwell) 517 passive_dwell = active_dwell + 1; 518 519 for (i = 0, added = 0; i < priv->scan_request->n_channels; i++) { 520 chan = priv->scan_request->channels[i]; 521 522 if (chan->band != band) 523 continue; 524 525 channel = chan->hw_value; 526 scan_ch->channel = cpu_to_le16(channel); 527 528 ch_info = iwl_get_channel_info(priv, band, channel); 529 if (!is_channel_valid(ch_info)) { 530 IWL_DEBUG_SCAN(priv, 531 "Channel %d is INVALID for this band.\n", 532 channel); 533 continue; 534 } 535 536 if (!is_active || is_channel_passive(ch_info) || 537 (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN)) 538 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE; 539 else 540 scan_ch->type = SCAN_CHANNEL_TYPE_ACTIVE; 541 542 if (n_probes) 543 scan_ch->type |= IWL_SCAN_PROBE_MASK(n_probes); 544 545 scan_ch->active_dwell = cpu_to_le16(active_dwell); 546 scan_ch->passive_dwell = cpu_to_le16(passive_dwell); 547 548 /* Set txpower levels to defaults */ 549 scan_ch->dsp_atten = 110; 550 551 /* NOTE: if we were doing 6Mb OFDM for scans we'd use 552 * power level: 553 * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3; 554 */ 555 if (band == IEEE80211_BAND_5GHZ) 556 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3; 557 else 558 scan_ch->tx_gain = ((1 << 5) | (5 << 3)); 559 560 IWL_DEBUG_SCAN(priv, "Scanning ch=%d prob=0x%X [%s %d]\n", 561 channel, le32_to_cpu(scan_ch->type), 562 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ? 563 "ACTIVE" : "PASSIVE", 564 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ? 565 active_dwell : passive_dwell); 566 567 scan_ch++; 568 added++; 569 } 570 571 IWL_DEBUG_SCAN(priv, "total channels to scan %d\n", added); 572 return added; 573} 574 575/** 576 * iwl_fill_probe_req - fill in all required fields and IE for probe request 577 */ 578 579static u16 iwl_fill_probe_req(struct ieee80211_mgmt *frame, const u8 *ta, 580 const u8 *ies, int ie_len, int left) 581{ 582 int len = 0; 583 u8 *pos = NULL; 584 585 /* Make sure there is enough space for the probe request, 586 * two mandatory IEs and the data */ 587 left -= 24; 588 if (left < 0) 589 return 0; 590 591 frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ); 592 memcpy(frame->da, iwl_bcast_addr, ETH_ALEN); 593 memcpy(frame->sa, ta, ETH_ALEN); 594 memcpy(frame->bssid, iwl_bcast_addr, ETH_ALEN); 595 frame->seq_ctrl = 0; 596 597 len += 24; 598 599 /* ...next IE... */ 600 pos = &frame->u.probe_req.variable[0]; 601 602 /* fill in our indirect SSID IE */ 603 left -= 2; 604 if (left < 0) 605 return 0; 606 *pos++ = WLAN_EID_SSID; 607 *pos++ = 0; 608 609 len += 2; 610 611 if (WARN_ON(left < ie_len)) 612 return len; 613 614 if (ies && ie_len) { 615 memcpy(pos, ies, ie_len); 616 len += ie_len; 617 } 618 619 return (u16)len; 620} 621 622static int iwlagn_request_scan(struct iwl_priv *priv, struct ieee80211_vif *vif) 623{ 624 struct iwl_host_cmd cmd = { 625 .id = REPLY_SCAN_CMD, 626 .len = { sizeof(struct iwl_scan_cmd), }, 627 .flags = CMD_SYNC, 628 }; 629 struct iwl_scan_cmd *scan; 630 struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS]; 631 u32 rate_flags = 0; 632 u16 cmd_len = 0; 633 u16 rx_chain = 0; 634 enum ieee80211_band band; 635 u8 n_probes = 0; 636 u8 rx_ant = hw_params(priv).valid_rx_ant; 637 u8 rate; 638 bool is_active = false; 639 int chan_mod; 640 u8 active_chains; 641 u8 scan_tx_antennas = hw_params(priv).valid_tx_ant; 642 int ret; 643 644 lockdep_assert_held(&priv->mutex); 645 646 if (vif) 647 ctx = iwl_rxon_ctx_from_vif(vif); 648 649 if (!priv->scan_cmd) { 650 priv->scan_cmd = kmalloc(sizeof(struct iwl_scan_cmd) + 651 IWL_MAX_SCAN_SIZE, GFP_KERNEL); 652 if (!priv->scan_cmd) { 653 IWL_DEBUG_SCAN(priv, 654 "fail to allocate memory for scan\n"); 655 return -ENOMEM; 656 } 657 } 658 scan = priv->scan_cmd; 659 memset(scan, 0, sizeof(struct iwl_scan_cmd) + IWL_MAX_SCAN_SIZE); 660 661 scan->quiet_plcp_th = IWL_PLCP_QUIET_THRESH; 662 scan->quiet_time = IWL_ACTIVE_QUIET_TIME; 663 664 if (priv->scan_type != IWL_SCAN_ROC && 665 iwl_is_any_associated(priv)) { 666 u16 interval = 0; 667 u32 extra; 668 u32 suspend_time = 100; 669 u32 scan_suspend_time = 100; 670 671 IWL_DEBUG_INFO(priv, "Scanning while associated...\n"); 672 switch (priv->scan_type) { 673 case IWL_SCAN_ROC: 674 WARN_ON(1); 675 break; 676 case IWL_SCAN_RADIO_RESET: 677 interval = 0; 678 break; 679 case IWL_SCAN_NORMAL: 680 interval = vif->bss_conf.beacon_int; 681 break; 682 } 683 684 scan->suspend_time = 0; 685 scan->max_out_time = cpu_to_le32(200 * 1024); 686 if (!interval) 687 interval = suspend_time; 688 689 extra = (suspend_time / interval) << 22; 690 scan_suspend_time = (extra | 691 ((suspend_time % interval) * 1024)); 692 scan->suspend_time = cpu_to_le32(scan_suspend_time); 693 IWL_DEBUG_SCAN(priv, "suspend_time 0x%X beacon interval %d\n", 694 scan_suspend_time, interval); 695 } else if (priv->scan_type == IWL_SCAN_ROC) { 696 scan->suspend_time = 0; 697 scan->max_out_time = 0; 698 scan->quiet_time = 0; 699 scan->quiet_plcp_th = 0; 700 } 701 702 switch (priv->scan_type) { 703 case IWL_SCAN_RADIO_RESET: 704 IWL_DEBUG_SCAN(priv, "Start internal passive scan.\n"); 705 break; 706 case IWL_SCAN_NORMAL: 707 if (priv->scan_request->n_ssids) { 708 int i, p = 0; 709 IWL_DEBUG_SCAN(priv, "Kicking off active scan\n"); 710 for (i = 0; i < priv->scan_request->n_ssids; i++) { 711 /* always does wildcard anyway */ 712 if (!priv->scan_request->ssids[i].ssid_len) 713 continue; 714 scan->direct_scan[p].id = WLAN_EID_SSID; 715 scan->direct_scan[p].len = 716 priv->scan_request->ssids[i].ssid_len; 717 memcpy(scan->direct_scan[p].ssid, 718 priv->scan_request->ssids[i].ssid, 719 priv->scan_request->ssids[i].ssid_len); 720 n_probes++; 721 p++; 722 } 723 is_active = true; 724 } else 725 IWL_DEBUG_SCAN(priv, "Start passive scan.\n"); 726 break; 727 case IWL_SCAN_ROC: 728 IWL_DEBUG_SCAN(priv, "Start ROC scan.\n"); 729 break; 730 } 731 732 scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK; 733 scan->tx_cmd.sta_id = ctx->bcast_sta_id; 734 scan->tx_cmd.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE; 735 736 switch (priv->scan_band) { 737 case IEEE80211_BAND_2GHZ: 738 scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK; 739 chan_mod = le32_to_cpu( 740 priv->contexts[IWL_RXON_CTX_BSS].active.flags & 741 RXON_FLG_CHANNEL_MODE_MSK) 742 >> RXON_FLG_CHANNEL_MODE_POS; 743 if ((priv->scan_request && priv->scan_request->no_cck) || 744 chan_mod == CHANNEL_MODE_PURE_40) { 745 rate = IWL_RATE_6M_PLCP; 746 } else { 747 rate = IWL_RATE_1M_PLCP; 748 rate_flags = RATE_MCS_CCK_MSK; 749 } 750 /* 751 * Internal scans are passive, so we can indiscriminately set 752 * the BT ignore flag on 2.4 GHz since it applies to TX only. 753 */ 754 if (cfg(priv)->bt_params && 755 cfg(priv)->bt_params->advanced_bt_coexist) 756 scan->tx_cmd.tx_flags |= TX_CMD_FLG_IGNORE_BT; 757 break; 758 case IEEE80211_BAND_5GHZ: 759 rate = IWL_RATE_6M_PLCP; 760 break; 761 default: 762 IWL_WARN(priv, "Invalid scan band\n"); 763 return -EIO; 764 } 765 766 /* 767 * If active scanning is requested but a certain channel is 768 * marked passive, we can do active scanning if we detect 769 * transmissions. 770 * 771 * There is an issue with some firmware versions that triggers 772 * a sysassert on a "good CRC threshold" of zero (== disabled), 773 * on a radar channel even though this means that we should NOT 774 * send probes. 775 * 776 * The "good CRC threshold" is the number of frames that we 777 * need to receive during our dwell time on a channel before 778 * sending out probes -- setting this to a huge value will 779 * mean we never reach it, but at the same time work around 780 * the aforementioned issue. Thus use IWL_GOOD_CRC_TH_NEVER 781 * here instead of IWL_GOOD_CRC_TH_DISABLED. 782 * 783 * This was fixed in later versions along with some other 784 * scan changes, and the threshold behaves as a flag in those 785 * versions. 786 */ 787 if (priv->new_scan_threshold_behaviour) 788 scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH_DEFAULT : 789 IWL_GOOD_CRC_TH_DISABLED; 790 else 791 scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH_DEFAULT : 792 IWL_GOOD_CRC_TH_NEVER; 793 794 band = priv->scan_band; 795 796 if (cfg(priv)->scan_rx_antennas[band]) 797 rx_ant = cfg(priv)->scan_rx_antennas[band]; 798 799 if (band == IEEE80211_BAND_2GHZ && 800 cfg(priv)->bt_params && 801 cfg(priv)->bt_params->advanced_bt_coexist) { 802 /* transmit 2.4 GHz probes only on first antenna */ 803 scan_tx_antennas = first_antenna(scan_tx_antennas); 804 } 805 806 priv->scan_tx_ant[band] = iwl_toggle_tx_ant(priv, 807 priv->scan_tx_ant[band], 808 scan_tx_antennas); 809 rate_flags |= iwl_ant_idx_to_flags(priv->scan_tx_ant[band]); 810 scan->tx_cmd.rate_n_flags = iwl_hw_set_rate_n_flags(rate, rate_flags); 811 812 /* In power save mode use one chain, otherwise use all chains */ 813 if (test_bit(STATUS_POWER_PMI, &priv->shrd->status)) { 814 /* rx_ant has been set to all valid chains previously */ 815 active_chains = rx_ant & 816 ((u8)(priv->chain_noise_data.active_chains)); 817 if (!active_chains) 818 active_chains = rx_ant; 819 820 IWL_DEBUG_SCAN(priv, "chain_noise_data.active_chains: %u\n", 821 priv->chain_noise_data.active_chains); 822 823 rx_ant = first_antenna(active_chains); 824 } 825 if (cfg(priv)->bt_params && 826 cfg(priv)->bt_params->advanced_bt_coexist && 827 priv->bt_full_concurrent) { 828 /* operated as 1x1 in full concurrency mode */ 829 rx_ant = first_antenna(rx_ant); 830 } 831 832 /* MIMO is not used here, but value is required */ 833 rx_chain |= 834 hw_params(priv).valid_rx_ant << RXON_RX_CHAIN_VALID_POS; 835 rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_MIMO_SEL_POS; 836 rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_SEL_POS; 837 rx_chain |= 0x1 << RXON_RX_CHAIN_DRIVER_FORCE_POS; 838 scan->rx_chain = cpu_to_le16(rx_chain); 839 switch (priv->scan_type) { 840 case IWL_SCAN_NORMAL: 841 cmd_len = iwl_fill_probe_req( 842 (struct ieee80211_mgmt *)scan->data, 843 vif->addr, 844 priv->scan_request->ie, 845 priv->scan_request->ie_len, 846 IWL_MAX_SCAN_SIZE - sizeof(*scan)); 847 break; 848 case IWL_SCAN_RADIO_RESET: 849 case IWL_SCAN_ROC: 850 /* use bcast addr, will not be transmitted but must be valid */ 851 cmd_len = iwl_fill_probe_req( 852 (struct ieee80211_mgmt *)scan->data, 853 iwl_bcast_addr, NULL, 0, 854 IWL_MAX_SCAN_SIZE - sizeof(*scan)); 855 break; 856 default: 857 BUG(); 858 } 859 scan->tx_cmd.len = cpu_to_le16(cmd_len); 860 861 scan->filter_flags |= (RXON_FILTER_ACCEPT_GRP_MSK | 862 RXON_FILTER_BCON_AWARE_MSK); 863 864 switch (priv->scan_type) { 865 case IWL_SCAN_RADIO_RESET: 866 scan->channel_count = 867 iwl_get_single_channel_for_scan(priv, vif, band, 868 (void *)&scan->data[cmd_len]); 869 break; 870 case IWL_SCAN_NORMAL: 871 scan->channel_count = 872 iwl_get_channels_for_scan(priv, vif, band, 873 is_active, n_probes, 874 (void *)&scan->data[cmd_len]); 875 break; 876 case IWL_SCAN_ROC: { 877 struct iwl_scan_channel *scan_ch; 878 int n_chan, i; 879 u16 dwell; 880 881 dwell = iwl_limit_dwell(priv, priv->hw_roc_duration); 882 n_chan = DIV_ROUND_UP(priv->hw_roc_duration, dwell); 883 884 scan->channel_count = n_chan; 885 886 scan_ch = (void *)&scan->data[cmd_len]; 887 888 for (i = 0; i < n_chan; i++) { 889 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE; 890 scan_ch->channel = 891 cpu_to_le16(priv->hw_roc_channel->hw_value); 892 893 if (i == n_chan - 1) 894 dwell = priv->hw_roc_duration - i * dwell; 895 896 scan_ch->active_dwell = 897 scan_ch->passive_dwell = cpu_to_le16(dwell); 898 899 /* Set txpower levels to defaults */ 900 scan_ch->dsp_atten = 110; 901 902 /* NOTE: if we were doing 6Mb OFDM for scans we'd use 903 * power level: 904 * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3; 905 */ 906 if (priv->hw_roc_channel->band == IEEE80211_BAND_5GHZ) 907 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3; 908 else 909 scan_ch->tx_gain = ((1 << 5) | (5 << 3)); 910 911 scan_ch++; 912 } 913 } 914 915 break; 916 } 917 918 if (scan->channel_count == 0) { 919 IWL_DEBUG_SCAN(priv, "channel count %d\n", scan->channel_count); 920 return -EIO; 921 } 922 923 cmd.len[0] += le16_to_cpu(scan->tx_cmd.len) + 924 scan->channel_count * sizeof(struct iwl_scan_channel); 925 cmd.data[0] = scan; 926 cmd.dataflags[0] = IWL_HCMD_DFL_NOCOPY; 927 scan->len = cpu_to_le16(cmd.len[0]); 928 929 /* set scan bit here for PAN params */ 930 set_bit(STATUS_SCAN_HW, &priv->status); 931 932 ret = iwlagn_set_pan_params(priv); 933 if (ret) 934 return ret; 935 936 ret = iwl_dvm_send_cmd(priv, &cmd); 937 if (ret) { 938 clear_bit(STATUS_SCAN_HW, &priv->status); 939 iwlagn_set_pan_params(priv); 940 } 941 942 return ret; 943} 944 945void iwl_init_scan_params(struct iwl_priv *priv) 946{ 947 u8 ant_idx = fls(hw_params(priv).valid_tx_ant) - 1; 948 if (!priv->scan_tx_ant[IEEE80211_BAND_5GHZ]) 949 priv->scan_tx_ant[IEEE80211_BAND_5GHZ] = ant_idx; 950 if (!priv->scan_tx_ant[IEEE80211_BAND_2GHZ]) 951 priv->scan_tx_ant[IEEE80211_BAND_2GHZ] = ant_idx; 952} 953 954int __must_check iwl_scan_initiate(struct iwl_priv *priv, 955 struct ieee80211_vif *vif, 956 enum iwl_scan_type scan_type, 957 enum ieee80211_band band) 958{ 959 int ret; 960 961 lockdep_assert_held(&priv->mutex); 962 963 cancel_delayed_work(&priv->scan_check); 964 965 if (!iwl_is_ready_rf(priv)) { 966 IWL_WARN(priv, "Request scan called when driver not ready.\n"); 967 return -EIO; 968 } 969 970 if (test_bit(STATUS_SCAN_HW, &priv->status)) { 971 IWL_DEBUG_SCAN(priv, 972 "Multiple concurrent scan requests in parallel.\n"); 973 return -EBUSY; 974 } 975 976 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) { 977 IWL_DEBUG_SCAN(priv, "Scan request while abort pending.\n"); 978 return -EBUSY; 979 } 980 981 IWL_DEBUG_SCAN(priv, "Starting %sscan...\n", 982 scan_type == IWL_SCAN_NORMAL ? "" : 983 scan_type == IWL_SCAN_ROC ? "remain-on-channel " : 984 "internal short "); 985 986 set_bit(STATUS_SCANNING, &priv->status); 987 priv->scan_type = scan_type; 988 priv->scan_start = jiffies; 989 priv->scan_band = band; 990 991 ret = iwlagn_request_scan(priv, vif); 992 if (ret) { 993 clear_bit(STATUS_SCANNING, &priv->status); 994 priv->scan_type = IWL_SCAN_NORMAL; 995 return ret; 996 } 997 998 queue_delayed_work(priv->workqueue, &priv->scan_check, 999 IWL_SCAN_CHECK_WATCHDOG); 1000 1001 return 0; 1002} 1003 1004 1005/* 1006 * internal short scan, this function should only been called while associated. 1007 * It will reset and tune the radio to prevent possible RF related problem 1008 */ 1009void iwl_internal_short_hw_scan(struct iwl_priv *priv) 1010{ 1011 queue_work(priv->workqueue, &priv->start_internal_scan); 1012} 1013 1014static void iwl_bg_start_internal_scan(struct work_struct *work) 1015{ 1016 struct iwl_priv *priv = 1017 container_of(work, struct iwl_priv, start_internal_scan); 1018 1019 IWL_DEBUG_SCAN(priv, "Start internal scan\n"); 1020 1021 mutex_lock(&priv->mutex); 1022 1023 if (priv->scan_type == IWL_SCAN_RADIO_RESET) { 1024 IWL_DEBUG_SCAN(priv, "Internal scan already in progress\n"); 1025 goto unlock; 1026 } 1027 1028 if (test_bit(STATUS_SCANNING, &priv->status)) { 1029 IWL_DEBUG_SCAN(priv, "Scan already in progress.\n"); 1030 goto unlock; 1031 } 1032 1033 if (iwl_scan_initiate(priv, NULL, IWL_SCAN_RADIO_RESET, priv->band)) 1034 IWL_DEBUG_SCAN(priv, "failed to start internal short scan\n"); 1035 unlock: 1036 mutex_unlock(&priv->mutex); 1037} 1038 1039static void iwl_bg_scan_check(struct work_struct *data) 1040{ 1041 struct iwl_priv *priv = 1042 container_of(data, struct iwl_priv, scan_check.work); 1043 1044 IWL_DEBUG_SCAN(priv, "Scan check work\n"); 1045 1046 /* Since we are here firmware does not finish scan and 1047 * most likely is in bad shape, so we don't bother to 1048 * send abort command, just force scan complete to mac80211 */ 1049 mutex_lock(&priv->mutex); 1050 iwl_force_scan_end(priv); 1051 mutex_unlock(&priv->mutex); 1052} 1053 1054static void iwl_bg_abort_scan(struct work_struct *work) 1055{ 1056 struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan); 1057 1058 IWL_DEBUG_SCAN(priv, "Abort scan work\n"); 1059 1060 /* We keep scan_check work queued in case when firmware will not 1061 * report back scan completed notification */ 1062 mutex_lock(&priv->mutex); 1063 iwl_scan_cancel_timeout(priv, 200); 1064 mutex_unlock(&priv->mutex); 1065} 1066 1067static void iwl_bg_scan_completed(struct work_struct *work) 1068{ 1069 struct iwl_priv *priv = 1070 container_of(work, struct iwl_priv, scan_completed); 1071 1072 mutex_lock(&priv->mutex); 1073 iwl_process_scan_complete(priv); 1074 mutex_unlock(&priv->mutex); 1075} 1076 1077void iwl_setup_scan_deferred_work(struct iwl_priv *priv) 1078{ 1079 INIT_WORK(&priv->scan_completed, iwl_bg_scan_completed); 1080 INIT_WORK(&priv->abort_scan, iwl_bg_abort_scan); 1081 INIT_WORK(&priv->start_internal_scan, iwl_bg_start_internal_scan); 1082 INIT_DELAYED_WORK(&priv->scan_check, iwl_bg_scan_check); 1083} 1084 1085void iwl_cancel_scan_deferred_work(struct iwl_priv *priv) 1086{ 1087 cancel_work_sync(&priv->start_internal_scan); 1088 cancel_work_sync(&priv->abort_scan); 1089 cancel_work_sync(&priv->scan_completed); 1090 1091 if (cancel_delayed_work_sync(&priv->scan_check)) { 1092 mutex_lock(&priv->mutex); 1093 iwl_force_scan_end(priv); 1094 mutex_unlock(&priv->mutex); 1095 } 1096} 1097