1// SPDX-License-Identifier: GPL-2.0-only 2/****************************************************************************** 3 * 4 * Copyright(c) 2008 - 2014 Intel Corporation. All rights reserved. 5 * Copyright(c) 2018 Intel Corporation 6 * 7 * Contact Information: 8 * Intel Linux Wireless <linuxwifi@intel.com> 9 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 10 *****************************************************************************/ 11#include <linux/slab.h> 12#include <linux/types.h> 13#include <linux/etherdevice.h> 14#include <net/mac80211.h> 15 16#include "dev.h" 17#include "agn.h" 18 19/* For active scan, listen ACTIVE_DWELL_TIME (msec) on each channel after 20 * sending probe req. This should be set long enough to hear probe responses 21 * from more than one AP. */ 22#define IWL_ACTIVE_DWELL_TIME_24 (30) /* all times in msec */ 23#define IWL_ACTIVE_DWELL_TIME_52 (20) 24 25#define IWL_ACTIVE_DWELL_FACTOR_24GHZ (3) 26#define IWL_ACTIVE_DWELL_FACTOR_52GHZ (2) 27 28/* For passive scan, listen PASSIVE_DWELL_TIME (msec) on each channel. 29 * Must be set longer than active dwell time. 30 * For the most reliable scan, set > AP beacon interval (typically 100msec). */ 31#define IWL_PASSIVE_DWELL_TIME_24 (20) /* all times in msec */ 32#define IWL_PASSIVE_DWELL_TIME_52 (10) 33#define IWL_PASSIVE_DWELL_BASE (100) 34#define IWL_CHANNEL_TUNE_TIME 5 35#define MAX_SCAN_CHANNEL 50 36 37/* For reset radio, need minimal dwell time only */ 38#define IWL_RADIO_RESET_DWELL_TIME 5 39 40static int iwl_send_scan_abort(struct iwl_priv *priv) 41{ 42 int ret; 43 struct iwl_host_cmd cmd = { 44 .id = REPLY_SCAN_ABORT_CMD, 45 .flags = CMD_WANT_SKB, 46 }; 47 __le32 *status; 48 49 /* Exit instantly with error when device is not ready 50 * to receive scan abort command or it does not perform 51 * hardware scan currently */ 52 if (!test_bit(STATUS_READY, &priv->status) || 53 !test_bit(STATUS_SCAN_HW, &priv->status) || 54 test_bit(STATUS_FW_ERROR, &priv->status)) 55 return -EIO; 56 57 ret = iwl_dvm_send_cmd(priv, &cmd); 58 if (ret) 59 return ret; 60 61 status = (void *)cmd.resp_pkt->data; 62 if (*status != CAN_ABORT_STATUS) { 63 /* The scan abort will return 1 for success or 64 * 2 for "failure". A failure condition can be 65 * due to simply not being in an active scan which 66 * can occur if we send the scan abort before we 67 * the microcode has notified us that a scan is 68 * completed. */ 69 IWL_DEBUG_SCAN(priv, "SCAN_ABORT ret %d.\n", 70 le32_to_cpu(*status)); 71 ret = -EIO; 72 } 73 74 iwl_free_resp(&cmd); 75 return ret; 76} 77 78static void iwl_complete_scan(struct iwl_priv *priv, bool aborted) 79{ 80 struct cfg80211_scan_info info = { 81 .aborted = aborted, 82 }; 83 84 /* check if scan was requested from mac80211 */ 85 if (priv->scan_request) { 86 IWL_DEBUG_SCAN(priv, "Complete scan in mac80211\n"); 87 ieee80211_scan_completed(priv->hw, &info); 88 } 89 90 priv->scan_type = IWL_SCAN_NORMAL; 91 priv->scan_vif = NULL; 92 priv->scan_request = NULL; 93} 94 95static void iwl_process_scan_complete(struct iwl_priv *priv) 96{ 97 bool aborted; 98 99 lockdep_assert_held(&priv->mutex); 100 101 if (!test_and_clear_bit(STATUS_SCAN_COMPLETE, &priv->status)) 102 return; 103 104 IWL_DEBUG_SCAN(priv, "Completed scan.\n"); 105 106 cancel_delayed_work(&priv->scan_check); 107 108 aborted = test_and_clear_bit(STATUS_SCAN_ABORTING, &priv->status); 109 if (aborted) 110 IWL_DEBUG_SCAN(priv, "Aborted scan completed.\n"); 111 112 if (!test_and_clear_bit(STATUS_SCANNING, &priv->status)) { 113 IWL_DEBUG_SCAN(priv, "Scan already completed.\n"); 114 goto out_settings; 115 } 116 117 if (priv->scan_type != IWL_SCAN_NORMAL && !aborted) { 118 int err; 119 120 /* Check if mac80211 requested scan during our internal scan */ 121 if (priv->scan_request == NULL) 122 goto out_complete; 123 124 /* If so request a new scan */ 125 err = iwl_scan_initiate(priv, priv->scan_vif, IWL_SCAN_NORMAL, 126 priv->scan_request->channels[0]->band); 127 if (err) { 128 IWL_DEBUG_SCAN(priv, 129 "failed to initiate pending scan: %d\n", err); 130 aborted = true; 131 goto out_complete; 132 } 133 134 return; 135 } 136 137out_complete: 138 iwl_complete_scan(priv, aborted); 139 140out_settings: 141 /* Can we still talk to firmware ? */ 142 if (!iwl_is_ready_rf(priv)) 143 return; 144 145 iwlagn_post_scan(priv); 146} 147 148void iwl_force_scan_end(struct iwl_priv *priv) 149{ 150 lockdep_assert_held(&priv->mutex); 151 152 if (!test_bit(STATUS_SCANNING, &priv->status)) { 153 IWL_DEBUG_SCAN(priv, "Forcing scan end while not scanning\n"); 154 return; 155 } 156 157 IWL_DEBUG_SCAN(priv, "Forcing scan end\n"); 158 clear_bit(STATUS_SCANNING, &priv->status); 159 clear_bit(STATUS_SCAN_HW, &priv->status); 160 clear_bit(STATUS_SCAN_ABORTING, &priv->status); 161 clear_bit(STATUS_SCAN_COMPLETE, &priv->status); 162 iwl_complete_scan(priv, true); 163} 164 165static void iwl_do_scan_abort(struct iwl_priv *priv) 166{ 167 int ret; 168 169 lockdep_assert_held(&priv->mutex); 170 171 if (!test_bit(STATUS_SCANNING, &priv->status)) { 172 IWL_DEBUG_SCAN(priv, "Not performing scan to abort\n"); 173 return; 174 } 175 176 if (test_and_set_bit(STATUS_SCAN_ABORTING, &priv->status)) { 177 IWL_DEBUG_SCAN(priv, "Scan abort in progress\n"); 178 return; 179 } 180 181 ret = iwl_send_scan_abort(priv); 182 if (ret) { 183 IWL_DEBUG_SCAN(priv, "Send scan abort failed %d\n", ret); 184 iwl_force_scan_end(priv); 185 } else 186 IWL_DEBUG_SCAN(priv, "Successfully send scan abort\n"); 187} 188 189/* 190 * iwl_scan_cancel - Cancel any currently executing HW scan 191 */ 192int iwl_scan_cancel(struct iwl_priv *priv) 193{ 194 IWL_DEBUG_SCAN(priv, "Queuing abort scan\n"); 195 queue_work(priv->workqueue, &priv->abort_scan); 196 return 0; 197} 198 199/* 200 * iwl_scan_cancel_timeout - Cancel any currently executing HW scan 201 * @ms: amount of time to wait (in milliseconds) for scan to abort 202 */ 203void iwl_scan_cancel_timeout(struct iwl_priv *priv, unsigned long ms) 204{ 205 unsigned long timeout = jiffies + msecs_to_jiffies(ms); 206 207 lockdep_assert_held(&priv->mutex); 208 209 IWL_DEBUG_SCAN(priv, "Scan cancel timeout\n"); 210 211 iwl_do_scan_abort(priv); 212 213 while (time_before_eq(jiffies, timeout)) { 214 if (!test_bit(STATUS_SCAN_HW, &priv->status)) 215 goto finished; 216 msleep(20); 217 } 218 219 return; 220 221 finished: 222 /* 223 * Now STATUS_SCAN_HW is clear. This means that the 224 * device finished, but the background work is going 225 * to execute at best as soon as we release the mutex. 226 * Since we need to be able to issue a new scan right 227 * after this function returns, run the complete here. 228 * The STATUS_SCAN_COMPLETE bit will then be cleared 229 * and prevent the background work from "completing" 230 * a possible new scan. 231 */ 232 iwl_process_scan_complete(priv); 233} 234 235/* Service response to REPLY_SCAN_CMD (0x80) */ 236static void iwl_rx_reply_scan(struct iwl_priv *priv, 237 struct iwl_rx_cmd_buffer *rxb) 238{ 239#ifdef CONFIG_IWLWIFI_DEBUG 240 struct iwl_rx_packet *pkt = rxb_addr(rxb); 241 struct iwl_scanreq_notification *notif = (void *)pkt->data; 242 243 IWL_DEBUG_SCAN(priv, "Scan request status = 0x%x\n", notif->status); 244#endif 245} 246 247/* Service SCAN_START_NOTIFICATION (0x82) */ 248static void iwl_rx_scan_start_notif(struct iwl_priv *priv, 249 struct iwl_rx_cmd_buffer *rxb) 250{ 251 struct iwl_rx_packet *pkt = rxb_addr(rxb); 252 struct iwl_scanstart_notification *notif = (void *)pkt->data; 253 254 priv->scan_start_tsf = le32_to_cpu(notif->tsf_low); 255 IWL_DEBUG_SCAN(priv, "Scan start: " 256 "%d [802.11%s] " 257 "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n", 258 notif->channel, 259 notif->band ? "bg" : "a", 260 le32_to_cpu(notif->tsf_high), 261 le32_to_cpu(notif->tsf_low), 262 notif->status, notif->beacon_timer); 263} 264 265/* Service SCAN_RESULTS_NOTIFICATION (0x83) */ 266static void iwl_rx_scan_results_notif(struct iwl_priv *priv, 267 struct iwl_rx_cmd_buffer *rxb) 268{ 269#ifdef CONFIG_IWLWIFI_DEBUG 270 struct iwl_rx_packet *pkt = rxb_addr(rxb); 271 struct iwl_scanresults_notification *notif = (void *)pkt->data; 272 273 IWL_DEBUG_SCAN(priv, "Scan ch.res: " 274 "%d [802.11%s] " 275 "probe status: %u:%u " 276 "(TSF: 0x%08X:%08X) - %d " 277 "elapsed=%lu usec\n", 278 notif->channel, 279 notif->band ? "bg" : "a", 280 notif->probe_status, notif->num_probe_not_sent, 281 le32_to_cpu(notif->tsf_high), 282 le32_to_cpu(notif->tsf_low), 283 le32_to_cpu(notif->statistics[0]), 284 le32_to_cpu(notif->tsf_low) - priv->scan_start_tsf); 285#endif 286} 287 288/* Service SCAN_COMPLETE_NOTIFICATION (0x84) */ 289static void iwl_rx_scan_complete_notif(struct iwl_priv *priv, 290 struct iwl_rx_cmd_buffer *rxb) 291{ 292 struct iwl_rx_packet *pkt = rxb_addr(rxb); 293 struct iwl_scancomplete_notification *scan_notif = (void *)pkt->data; 294 295 IWL_DEBUG_SCAN(priv, "Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n", 296 scan_notif->scanned_channels, 297 scan_notif->tsf_low, 298 scan_notif->tsf_high, scan_notif->status); 299 300 IWL_DEBUG_SCAN(priv, "Scan on %sGHz took %dms\n", 301 (priv->scan_band == NL80211_BAND_2GHZ) ? "2.4" : "5.2", 302 jiffies_to_msecs(jiffies - priv->scan_start)); 303 304 /* 305 * When aborting, we run the scan completed background work inline 306 * and the background work must then do nothing. The SCAN_COMPLETE 307 * bit helps implement that logic and thus needs to be set before 308 * queueing the work. Also, since the scan abort waits for SCAN_HW 309 * to clear, we need to set SCAN_COMPLETE before clearing SCAN_HW 310 * to avoid a race there. 311 */ 312 set_bit(STATUS_SCAN_COMPLETE, &priv->status); 313 clear_bit(STATUS_SCAN_HW, &priv->status); 314 queue_work(priv->workqueue, &priv->scan_completed); 315 316 if (priv->iw_mode != NL80211_IFTYPE_ADHOC && 317 iwl_advanced_bt_coexist(priv) && 318 priv->bt_status != scan_notif->bt_status) { 319 if (scan_notif->bt_status) { 320 /* BT on */ 321 if (!priv->bt_ch_announce) 322 priv->bt_traffic_load = 323 IWL_BT_COEX_TRAFFIC_LOAD_HIGH; 324 /* 325 * otherwise, no traffic load information provided 326 * no changes made 327 */ 328 } else { 329 /* BT off */ 330 priv->bt_traffic_load = 331 IWL_BT_COEX_TRAFFIC_LOAD_NONE; 332 } 333 priv->bt_status = scan_notif->bt_status; 334 queue_work(priv->workqueue, 335 &priv->bt_traffic_change_work); 336 } 337} 338 339void iwl_setup_rx_scan_handlers(struct iwl_priv *priv) 340{ 341 /* scan handlers */ 342 priv->rx_handlers[REPLY_SCAN_CMD] = iwl_rx_reply_scan; 343 priv->rx_handlers[SCAN_START_NOTIFICATION] = iwl_rx_scan_start_notif; 344 priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] = 345 iwl_rx_scan_results_notif; 346 priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] = 347 iwl_rx_scan_complete_notif; 348} 349 350static u16 iwl_get_active_dwell_time(struct iwl_priv *priv, 351 enum nl80211_band band, u8 n_probes) 352{ 353 if (band == NL80211_BAND_5GHZ) 354 return IWL_ACTIVE_DWELL_TIME_52 + 355 IWL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1); 356 else 357 return IWL_ACTIVE_DWELL_TIME_24 + 358 IWL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1); 359} 360 361static u16 iwl_limit_dwell(struct iwl_priv *priv, u16 dwell_time) 362{ 363 struct iwl_rxon_context *ctx; 364 int limits[NUM_IWL_RXON_CTX] = {}; 365 int n_active = 0; 366 u16 limit; 367 368 BUILD_BUG_ON(NUM_IWL_RXON_CTX != 2); 369 370 /* 371 * If we're associated, we clamp the dwell time 98% 372 * of the beacon interval (minus 2 * channel tune time) 373 * If both contexts are active, we have to restrict to 374 * 1/2 of the minimum of them, because they might be in 375 * lock-step with the time inbetween only half of what 376 * time we'd have in each of them. 377 */ 378 for_each_context(priv, ctx) { 379 switch (ctx->staging.dev_type) { 380 case RXON_DEV_TYPE_P2P: 381 /* no timing constraints */ 382 continue; 383 case RXON_DEV_TYPE_ESS: 384 default: 385 /* timing constraints if associated */ 386 if (!iwl_is_associated_ctx(ctx)) 387 continue; 388 break; 389 case RXON_DEV_TYPE_CP: 390 case RXON_DEV_TYPE_2STA: 391 /* 392 * These seem to always have timers for TBTT 393 * active in uCode even when not associated yet. 394 */ 395 break; 396 } 397 398 limits[n_active++] = ctx->beacon_int ?: IWL_PASSIVE_DWELL_BASE; 399 } 400 401 switch (n_active) { 402 case 0: 403 return dwell_time; 404 case 2: 405 limit = (limits[1] * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2; 406 limit /= 2; 407 dwell_time = min(limit, dwell_time); 408 /* fall through */ 409 case 1: 410 limit = (limits[0] * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2; 411 limit /= n_active; 412 return min(limit, dwell_time); 413 default: 414 WARN_ON_ONCE(1); 415 return dwell_time; 416 } 417} 418 419static u16 iwl_get_passive_dwell_time(struct iwl_priv *priv, 420 enum nl80211_band band) 421{ 422 u16 passive = (band == NL80211_BAND_2GHZ) ? 423 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 : 424 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52; 425 426 return iwl_limit_dwell(priv, passive); 427} 428 429/* Return valid, unused, channel for a passive scan to reset the RF */ 430static u8 iwl_get_single_channel_number(struct iwl_priv *priv, 431 enum nl80211_band band) 432{ 433 struct ieee80211_supported_band *sband = priv->hw->wiphy->bands[band]; 434 struct iwl_rxon_context *ctx; 435 int i; 436 437 for (i = 0; i < sband->n_channels; i++) { 438 bool busy = false; 439 440 for_each_context(priv, ctx) { 441 busy = sband->channels[i].hw_value == 442 le16_to_cpu(ctx->staging.channel); 443 if (busy) 444 break; 445 } 446 447 if (busy) 448 continue; 449 450 if (!(sband->channels[i].flags & IEEE80211_CHAN_DISABLED)) 451 return sband->channels[i].hw_value; 452 } 453 454 return 0; 455} 456 457static int iwl_get_channel_for_reset_scan(struct iwl_priv *priv, 458 struct ieee80211_vif *vif, 459 enum nl80211_band band, 460 struct iwl_scan_channel *scan_ch) 461{ 462 const struct ieee80211_supported_band *sband; 463 u16 channel; 464 465 sband = iwl_get_hw_mode(priv, band); 466 if (!sband) { 467 IWL_ERR(priv, "invalid band\n"); 468 return 0; 469 } 470 471 channel = iwl_get_single_channel_number(priv, band); 472 if (channel) { 473 scan_ch->channel = cpu_to_le16(channel); 474 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE; 475 scan_ch->active_dwell = 476 cpu_to_le16(IWL_RADIO_RESET_DWELL_TIME); 477 scan_ch->passive_dwell = 478 cpu_to_le16(IWL_RADIO_RESET_DWELL_TIME); 479 /* Set txpower levels to defaults */ 480 scan_ch->dsp_atten = 110; 481 if (band == NL80211_BAND_5GHZ) 482 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3; 483 else 484 scan_ch->tx_gain = ((1 << 5) | (5 << 3)); 485 return 1; 486 } 487 488 IWL_ERR(priv, "no valid channel found\n"); 489 return 0; 490} 491 492static int iwl_get_channels_for_scan(struct iwl_priv *priv, 493 struct ieee80211_vif *vif, 494 enum nl80211_band band, 495 u8 is_active, u8 n_probes, 496 struct iwl_scan_channel *scan_ch) 497{ 498 struct ieee80211_channel *chan; 499 const struct ieee80211_supported_band *sband; 500 u16 passive_dwell = 0; 501 u16 active_dwell = 0; 502 int added, i; 503 u16 channel; 504 505 sband = iwl_get_hw_mode(priv, band); 506 if (!sband) 507 return 0; 508 509 active_dwell = iwl_get_active_dwell_time(priv, band, n_probes); 510 passive_dwell = iwl_get_passive_dwell_time(priv, band); 511 512 if (passive_dwell <= active_dwell) 513 passive_dwell = active_dwell + 1; 514 515 for (i = 0, added = 0; i < priv->scan_request->n_channels; i++) { 516 chan = priv->scan_request->channels[i]; 517 518 if (chan->band != band) 519 continue; 520 521 channel = chan->hw_value; 522 scan_ch->channel = cpu_to_le16(channel); 523 524 if (!is_active || (chan->flags & IEEE80211_CHAN_NO_IR)) 525 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE; 526 else 527 scan_ch->type = SCAN_CHANNEL_TYPE_ACTIVE; 528 529 if (n_probes) 530 scan_ch->type |= IWL_SCAN_PROBE_MASK(n_probes); 531 532 scan_ch->active_dwell = cpu_to_le16(active_dwell); 533 scan_ch->passive_dwell = cpu_to_le16(passive_dwell); 534 535 /* Set txpower levels to defaults */ 536 scan_ch->dsp_atten = 110; 537 538 /* NOTE: if we were doing 6Mb OFDM for scans we'd use 539 * power level: 540 * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3; 541 */ 542 if (band == NL80211_BAND_5GHZ) 543 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3; 544 else 545 scan_ch->tx_gain = ((1 << 5) | (5 << 3)); 546 547 IWL_DEBUG_SCAN(priv, "Scanning ch=%d prob=0x%X [%s %d]\n", 548 channel, le32_to_cpu(scan_ch->type), 549 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ? 550 "ACTIVE" : "PASSIVE", 551 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ? 552 active_dwell : passive_dwell); 553 554 scan_ch++; 555 added++; 556 } 557 558 IWL_DEBUG_SCAN(priv, "total channels to scan %d\n", added); 559 return added; 560} 561 562/* 563 * iwl_fill_probe_req - fill in all required fields and IE for probe request 564 */ 565static u16 iwl_fill_probe_req(struct ieee80211_mgmt *frame, const u8 *ta, 566 const u8 *ies, int ie_len, const u8 *ssid, 567 u8 ssid_len, int left) 568{ 569 int len = 0; 570 u8 *pos = NULL; 571 572 /* Make sure there is enough space for the probe request, 573 * two mandatory IEs and the data */ 574 left -= 24; 575 if (left < 0) 576 return 0; 577 578 frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ); 579 eth_broadcast_addr(frame->da); 580 memcpy(frame->sa, ta, ETH_ALEN); 581 eth_broadcast_addr(frame->bssid); 582 frame->seq_ctrl = 0; 583 584 len += 24; 585 586 /* ...next IE... */ 587 pos = &frame->u.probe_req.variable[0]; 588 589 /* fill in our SSID IE */ 590 left -= ssid_len + 2; 591 if (left < 0) 592 return 0; 593 *pos++ = WLAN_EID_SSID; 594 *pos++ = ssid_len; 595 if (ssid && ssid_len) { 596 memcpy(pos, ssid, ssid_len); 597 pos += ssid_len; 598 } 599 600 len += ssid_len + 2; 601 602 if (WARN_ON(left < ie_len)) 603 return len; 604 605 if (ies && ie_len) { 606 memcpy(pos, ies, ie_len); 607 len += ie_len; 608 } 609 610 return (u16)len; 611} 612 613static int iwlagn_request_scan(struct iwl_priv *priv, struct ieee80211_vif *vif) 614{ 615 struct iwl_host_cmd cmd = { 616 .id = REPLY_SCAN_CMD, 617 .len = { sizeof(struct iwl_scan_cmd), }, 618 }; 619 struct iwl_scan_cmd *scan; 620 struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS]; 621 u32 rate_flags = 0; 622 u16 cmd_len = 0; 623 u16 rx_chain = 0; 624 enum nl80211_band band; 625 u8 n_probes = 0; 626 u8 rx_ant = priv->nvm_data->valid_rx_ant; 627 u8 rate; 628 bool is_active = false; 629 int chan_mod; 630 u8 active_chains; 631 u8 scan_tx_antennas = priv->nvm_data->valid_tx_ant; 632 int ret; 633 int scan_cmd_size = sizeof(struct iwl_scan_cmd) + 634 MAX_SCAN_CHANNEL * sizeof(struct iwl_scan_channel) + 635 priv->fw->ucode_capa.max_probe_length; 636 const u8 *ssid = NULL; 637 u8 ssid_len = 0; 638 639 if (WARN_ON(priv->scan_type == IWL_SCAN_NORMAL && 640 (!priv->scan_request || 641 priv->scan_request->n_channels > MAX_SCAN_CHANNEL))) 642 return -EINVAL; 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(scan_cmd_size, GFP_KERNEL); 651 if (!priv->scan_cmd) { 652 IWL_DEBUG_SCAN(priv, 653 "fail to allocate memory for scan\n"); 654 return -ENOMEM; 655 } 656 } 657 scan = priv->scan_cmd; 658 memset(scan, 0, scan_cmd_size); 659 660 scan->quiet_plcp_th = IWL_PLCP_QUIET_THRESH; 661 scan->quiet_time = IWL_ACTIVE_QUIET_TIME; 662 663 if (iwl_is_any_associated(priv)) { 664 u16 interval = 0; 665 u32 extra; 666 u32 suspend_time = 100; 667 u32 scan_suspend_time = 100; 668 669 IWL_DEBUG_INFO(priv, "Scanning while associated...\n"); 670 switch (priv->scan_type) { 671 case IWL_SCAN_RADIO_RESET: 672 interval = 0; 673 break; 674 case IWL_SCAN_NORMAL: 675 interval = vif->bss_conf.beacon_int; 676 break; 677 } 678 679 scan->suspend_time = 0; 680 scan->max_out_time = cpu_to_le32(200 * 1024); 681 if (!interval) 682 interval = suspend_time; 683 684 extra = (suspend_time / interval) << 22; 685 scan_suspend_time = (extra | 686 ((suspend_time % interval) * 1024)); 687 scan->suspend_time = cpu_to_le32(scan_suspend_time); 688 IWL_DEBUG_SCAN(priv, "suspend_time 0x%X beacon interval %d\n", 689 scan_suspend_time, interval); 690 } 691 692 switch (priv->scan_type) { 693 case IWL_SCAN_RADIO_RESET: 694 IWL_DEBUG_SCAN(priv, "Start internal passive scan.\n"); 695 /* 696 * Override quiet time as firmware checks that active 697 * dwell is >= quiet; since we use passive scan it'll 698 * not actually be used. 699 */ 700 scan->quiet_time = cpu_to_le16(IWL_RADIO_RESET_DWELL_TIME); 701 break; 702 case IWL_SCAN_NORMAL: 703 if (priv->scan_request->n_ssids) { 704 int i, p = 0; 705 IWL_DEBUG_SCAN(priv, "Kicking off active scan\n"); 706 /* 707 * The highest priority SSID is inserted to the 708 * probe request template. 709 */ 710 ssid_len = priv->scan_request->ssids[0].ssid_len; 711 ssid = priv->scan_request->ssids[0].ssid; 712 713 /* 714 * Invert the order of ssids, the firmware will invert 715 * it back. 716 */ 717 for (i = priv->scan_request->n_ssids - 1; i >= 1; i--) { 718 scan->direct_scan[p].id = WLAN_EID_SSID; 719 scan->direct_scan[p].len = 720 priv->scan_request->ssids[i].ssid_len; 721 memcpy(scan->direct_scan[p].ssid, 722 priv->scan_request->ssids[i].ssid, 723 priv->scan_request->ssids[i].ssid_len); 724 n_probes++; 725 p++; 726 } 727 is_active = true; 728 } else 729 IWL_DEBUG_SCAN(priv, "Start passive scan.\n"); 730 break; 731 } 732 733 scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK; 734 scan->tx_cmd.sta_id = ctx->bcast_sta_id; 735 scan->tx_cmd.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE; 736 737 switch (priv->scan_band) { 738 case NL80211_BAND_2GHZ: 739 scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK; 740 chan_mod = le32_to_cpu( 741 priv->contexts[IWL_RXON_CTX_BSS].active.flags & 742 RXON_FLG_CHANNEL_MODE_MSK) 743 >> RXON_FLG_CHANNEL_MODE_POS; 744 if ((priv->scan_request && priv->scan_request->no_cck) || 745 chan_mod == CHANNEL_MODE_PURE_40) { 746 rate = IWL_RATE_6M_PLCP; 747 } else { 748 rate = IWL_RATE_1M_PLCP; 749 rate_flags = RATE_MCS_CCK_MSK; 750 } 751 /* 752 * Internal scans are passive, so we can indiscriminately set 753 * the BT ignore flag on 2.4 GHz since it applies to TX only. 754 */ 755 if (priv->lib->bt_params && 756 priv->lib->bt_params->advanced_bt_coexist) 757 scan->tx_cmd.tx_flags |= TX_CMD_FLG_IGNORE_BT; 758 break; 759 case NL80211_BAND_5GHZ: 760 rate = IWL_RATE_6M_PLCP; 761 break; 762 default: 763 IWL_WARN(priv, "Invalid scan band\n"); 764 return -EIO; 765 } 766 767 /* 768 * If active scanning is requested but a certain channel is 769 * marked passive, we can do active scanning if we detect 770 * transmissions. 771 * 772 * There is an issue with some firmware versions that triggers 773 * a sysassert on a "good CRC threshold" of zero (== disabled), 774 * on a radar channel even though this means that we should NOT 775 * send probes. 776 * 777 * The "good CRC threshold" is the number of frames that we 778 * need to receive during our dwell time on a channel before 779 * sending out probes -- setting this to a huge value will 780 * mean we never reach it, but at the same time work around 781 * the aforementioned issue. Thus use IWL_GOOD_CRC_TH_NEVER 782 * here instead of IWL_GOOD_CRC_TH_DISABLED. 783 * 784 * This was fixed in later versions along with some other 785 * scan changes, and the threshold behaves as a flag in those 786 * versions. 787 */ 788 if (priv->new_scan_threshold_behaviour) 789 scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH_DEFAULT : 790 IWL_GOOD_CRC_TH_DISABLED; 791 else 792 scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH_DEFAULT : 793 IWL_GOOD_CRC_TH_NEVER; 794 795 band = priv->scan_band; 796 797 if (band == NL80211_BAND_2GHZ && 798 priv->lib->bt_params && 799 priv->lib->bt_params->advanced_bt_coexist) { 800 /* transmit 2.4 GHz probes only on first antenna */ 801 scan_tx_antennas = first_antenna(scan_tx_antennas); 802 } 803 804 priv->scan_tx_ant[band] = iwl_toggle_tx_ant(priv, 805 priv->scan_tx_ant[band], 806 scan_tx_antennas); 807 rate_flags |= iwl_ant_idx_to_flags(priv->scan_tx_ant[band]); 808 scan->tx_cmd.rate_n_flags = iwl_hw_set_rate_n_flags(rate, rate_flags); 809 810 /* 811 * In power save mode while associated use one chain, 812 * otherwise use all chains 813 */ 814 if (test_bit(STATUS_POWER_PMI, &priv->status) && 815 !(priv->hw->conf.flags & IEEE80211_CONF_IDLE)) { 816 /* rx_ant has been set to all valid chains previously */ 817 active_chains = rx_ant & 818 ((u8)(priv->chain_noise_data.active_chains)); 819 if (!active_chains) 820 active_chains = rx_ant; 821 822 IWL_DEBUG_SCAN(priv, "chain_noise_data.active_chains: %u\n", 823 priv->chain_noise_data.active_chains); 824 825 rx_ant = first_antenna(active_chains); 826 } 827 if (priv->lib->bt_params && 828 priv->lib->bt_params->advanced_bt_coexist && 829 priv->bt_full_concurrent) { 830 /* operated as 1x1 in full concurrency mode */ 831 rx_ant = first_antenna(rx_ant); 832 } 833 834 /* MIMO is not used here, but value is required */ 835 rx_chain |= 836 priv->nvm_data->valid_rx_ant << RXON_RX_CHAIN_VALID_POS; 837 rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_MIMO_SEL_POS; 838 rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_SEL_POS; 839 rx_chain |= 0x1 << RXON_RX_CHAIN_DRIVER_FORCE_POS; 840 scan->rx_chain = cpu_to_le16(rx_chain); 841 switch (priv->scan_type) { 842 case IWL_SCAN_NORMAL: 843 cmd_len = iwl_fill_probe_req( 844 (struct ieee80211_mgmt *)scan->data, 845 vif->addr, 846 priv->scan_request->ie, 847 priv->scan_request->ie_len, 848 ssid, ssid_len, 849 scan_cmd_size - sizeof(*scan)); 850 break; 851 case IWL_SCAN_RADIO_RESET: 852 /* use bcast addr, will not be transmitted but must be valid */ 853 cmd_len = iwl_fill_probe_req( 854 (struct ieee80211_mgmt *)scan->data, 855 iwl_bcast_addr, NULL, 0, 856 NULL, 0, 857 scan_cmd_size - sizeof(*scan)); 858 break; 859 default: 860 BUG(); 861 } 862 scan->tx_cmd.len = cpu_to_le16(cmd_len); 863 864 scan->filter_flags |= (RXON_FILTER_ACCEPT_GRP_MSK | 865 RXON_FILTER_BCON_AWARE_MSK); 866 867 switch (priv->scan_type) { 868 case IWL_SCAN_RADIO_RESET: 869 scan->channel_count = 870 iwl_get_channel_for_reset_scan(priv, vif, band, 871 (void *)&scan->data[cmd_len]); 872 break; 873 case IWL_SCAN_NORMAL: 874 scan->channel_count = 875 iwl_get_channels_for_scan(priv, vif, band, 876 is_active, n_probes, 877 (void *)&scan->data[cmd_len]); 878 break; 879 } 880 881 if (scan->channel_count == 0) { 882 IWL_DEBUG_SCAN(priv, "channel count %d\n", scan->channel_count); 883 return -EIO; 884 } 885 886 cmd.len[0] += le16_to_cpu(scan->tx_cmd.len) + 887 scan->channel_count * sizeof(struct iwl_scan_channel); 888 cmd.data[0] = scan; 889 cmd.dataflags[0] = IWL_HCMD_DFL_NOCOPY; 890 scan->len = cpu_to_le16(cmd.len[0]); 891 892 /* set scan bit here for PAN params */ 893 set_bit(STATUS_SCAN_HW, &priv->status); 894 895 ret = iwlagn_set_pan_params(priv); 896 if (ret) { 897 clear_bit(STATUS_SCAN_HW, &priv->status); 898 return ret; 899 } 900 901 ret = iwl_dvm_send_cmd(priv, &cmd); 902 if (ret) { 903 clear_bit(STATUS_SCAN_HW, &priv->status); 904 iwlagn_set_pan_params(priv); 905 } 906 907 return ret; 908} 909 910void iwl_init_scan_params(struct iwl_priv *priv) 911{ 912 u8 ant_idx = fls(priv->nvm_data->valid_tx_ant) - 1; 913 if (!priv->scan_tx_ant[NL80211_BAND_5GHZ]) 914 priv->scan_tx_ant[NL80211_BAND_5GHZ] = ant_idx; 915 if (!priv->scan_tx_ant[NL80211_BAND_2GHZ]) 916 priv->scan_tx_ant[NL80211_BAND_2GHZ] = ant_idx; 917} 918 919int __must_check iwl_scan_initiate(struct iwl_priv *priv, 920 struct ieee80211_vif *vif, 921 enum iwl_scan_type scan_type, 922 enum nl80211_band band) 923{ 924 int ret; 925 926 lockdep_assert_held(&priv->mutex); 927 928 cancel_delayed_work(&priv->scan_check); 929 930 if (!iwl_is_ready_rf(priv)) { 931 IWL_WARN(priv, "Request scan called when driver not ready.\n"); 932 return -EIO; 933 } 934 935 if (test_bit(STATUS_SCAN_HW, &priv->status)) { 936 IWL_DEBUG_SCAN(priv, 937 "Multiple concurrent scan requests in parallel.\n"); 938 return -EBUSY; 939 } 940 941 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) { 942 IWL_DEBUG_SCAN(priv, "Scan request while abort pending.\n"); 943 return -EBUSY; 944 } 945 946 IWL_DEBUG_SCAN(priv, "Starting %sscan...\n", 947 scan_type == IWL_SCAN_NORMAL ? "" : 948 "internal short "); 949 950 set_bit(STATUS_SCANNING, &priv->status); 951 priv->scan_type = scan_type; 952 priv->scan_start = jiffies; 953 priv->scan_band = band; 954 955 ret = iwlagn_request_scan(priv, vif); 956 if (ret) { 957 clear_bit(STATUS_SCANNING, &priv->status); 958 priv->scan_type = IWL_SCAN_NORMAL; 959 return ret; 960 } 961 962 queue_delayed_work(priv->workqueue, &priv->scan_check, 963 IWL_SCAN_CHECK_WATCHDOG); 964 965 return 0; 966} 967 968 969/* 970 * internal short scan, this function should only been called while associated. 971 * It will reset and tune the radio to prevent possible RF related problem 972 */ 973void iwl_internal_short_hw_scan(struct iwl_priv *priv) 974{ 975 queue_work(priv->workqueue, &priv->start_internal_scan); 976} 977 978static void iwl_bg_start_internal_scan(struct work_struct *work) 979{ 980 struct iwl_priv *priv = 981 container_of(work, struct iwl_priv, start_internal_scan); 982 983 IWL_DEBUG_SCAN(priv, "Start internal scan\n"); 984 985 mutex_lock(&priv->mutex); 986 987 if (priv->scan_type == IWL_SCAN_RADIO_RESET) { 988 IWL_DEBUG_SCAN(priv, "Internal scan already in progress\n"); 989 goto unlock; 990 } 991 992 if (test_bit(STATUS_SCANNING, &priv->status)) { 993 IWL_DEBUG_SCAN(priv, "Scan already in progress.\n"); 994 goto unlock; 995 } 996 997 if (iwl_scan_initiate(priv, NULL, IWL_SCAN_RADIO_RESET, priv->band)) 998 IWL_DEBUG_SCAN(priv, "failed to start internal short scan\n"); 999 unlock: 1000 mutex_unlock(&priv->mutex); 1001} 1002 1003static void iwl_bg_scan_check(struct work_struct *data) 1004{ 1005 struct iwl_priv *priv = 1006 container_of(data, struct iwl_priv, scan_check.work); 1007 1008 IWL_DEBUG_SCAN(priv, "Scan check work\n"); 1009 1010 /* Since we are here firmware does not finish scan and 1011 * most likely is in bad shape, so we don't bother to 1012 * send abort command, just force scan complete to mac80211 */ 1013 mutex_lock(&priv->mutex); 1014 iwl_force_scan_end(priv); 1015 mutex_unlock(&priv->mutex); 1016} 1017 1018static void iwl_bg_abort_scan(struct work_struct *work) 1019{ 1020 struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan); 1021 1022 IWL_DEBUG_SCAN(priv, "Abort scan work\n"); 1023 1024 /* We keep scan_check work queued in case when firmware will not 1025 * report back scan completed notification */ 1026 mutex_lock(&priv->mutex); 1027 iwl_scan_cancel_timeout(priv, 200); 1028 mutex_unlock(&priv->mutex); 1029} 1030 1031static void iwl_bg_scan_completed(struct work_struct *work) 1032{ 1033 struct iwl_priv *priv = 1034 container_of(work, struct iwl_priv, scan_completed); 1035 1036 mutex_lock(&priv->mutex); 1037 iwl_process_scan_complete(priv); 1038 mutex_unlock(&priv->mutex); 1039} 1040 1041void iwl_setup_scan_deferred_work(struct iwl_priv *priv) 1042{ 1043 INIT_WORK(&priv->scan_completed, iwl_bg_scan_completed); 1044 INIT_WORK(&priv->abort_scan, iwl_bg_abort_scan); 1045 INIT_WORK(&priv->start_internal_scan, iwl_bg_start_internal_scan); 1046 INIT_DELAYED_WORK(&priv->scan_check, iwl_bg_scan_check); 1047} 1048 1049void iwl_cancel_scan_deferred_work(struct iwl_priv *priv) 1050{ 1051 cancel_work_sync(&priv->start_internal_scan); 1052 cancel_work_sync(&priv->abort_scan); 1053 cancel_work_sync(&priv->scan_completed); 1054 1055 if (cancel_delayed_work_sync(&priv->scan_check)) { 1056 mutex_lock(&priv->mutex); 1057 iwl_force_scan_end(priv); 1058 mutex_unlock(&priv->mutex); 1059 } 1060} 1061