1 /****************************************************************************** 2 * 3 * GPL LICENSE SUMMARY 4 * 5 * Copyright(c) 2008 - 2014 Intel Corporation. All rights reserved. 6 * Copyright(c) 2018 Intel Corporation 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of version 2 of the GNU General Public License as 10 * published by the Free Software Foundation. 11 * 12 * This program is distributed in the hope that it will be useful, but 13 * WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * General Public License for more details. 16 * 17 * The full GNU General Public License is included in this distribution 18 * in the file called COPYING. 19 * 20 * Contact Information: 21 * Intel Linux Wireless <linuxwifi@intel.com> 22 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 23 *****************************************************************************/ 24 #include <linux/slab.h> 25 #include <linux/types.h> 26 #include <linux/etherdevice.h> 27 #include <net/mac80211.h> 28 29 #include "dev.h" 30 #include "agn.h" 31 32 /* For active scan, listen ACTIVE_DWELL_TIME (msec) on each channel after 33 * sending probe req. This should be set long enough to hear probe responses 34 * from more than one AP. */ 35 #define IWL_ACTIVE_DWELL_TIME_24 (30) /* all times in msec */ 36 #define IWL_ACTIVE_DWELL_TIME_52 (20) 37 38 #define IWL_ACTIVE_DWELL_FACTOR_24GHZ (3) 39 #define IWL_ACTIVE_DWELL_FACTOR_52GHZ (2) 40 41 /* For passive scan, listen PASSIVE_DWELL_TIME (msec) on each channel. 42 * Must be set longer than active dwell time. 43 * For the most reliable scan, set > AP beacon interval (typically 100msec). */ 44 #define IWL_PASSIVE_DWELL_TIME_24 (20) /* all times in msec */ 45 #define IWL_PASSIVE_DWELL_TIME_52 (10) 46 #define IWL_PASSIVE_DWELL_BASE (100) 47 #define IWL_CHANNEL_TUNE_TIME 5 48 #define MAX_SCAN_CHANNEL 50 49 50 /* For reset radio, need minimal dwell time only */ 51 #define IWL_RADIO_RESET_DWELL_TIME 5 52 53 static int iwl_send_scan_abort(struct iwl_priv *priv) 54 { 55 int ret; 56 struct iwl_host_cmd cmd = { 57 .id = REPLY_SCAN_ABORT_CMD, 58 .flags = CMD_WANT_SKB, 59 }; 60 __le32 *status; 61 62 /* Exit instantly with error when device is not ready 63 * to receive scan abort command or it does not perform 64 * hardware scan currently */ 65 if (!test_bit(STATUS_READY, &priv->status) || 66 !test_bit(STATUS_SCAN_HW, &priv->status) || 67 test_bit(STATUS_FW_ERROR, &priv->status)) 68 return -EIO; 69 70 ret = iwl_dvm_send_cmd(priv, &cmd); 71 if (ret) 72 return ret; 73 74 status = (void *)cmd.resp_pkt->data; 75 if (*status != CAN_ABORT_STATUS) { 76 /* The scan abort will return 1 for success or 77 * 2 for "failure". A failure condition can be 78 * due to simply not being in an active scan which 79 * can occur if we send the scan abort before we 80 * the microcode has notified us that a scan is 81 * completed. */ 82 IWL_DEBUG_SCAN(priv, "SCAN_ABORT ret %d.\n", 83 le32_to_cpu(*status)); 84 ret = -EIO; 85 } 86 87 iwl_free_resp(&cmd); 88 return ret; 89 } 90 91 static void iwl_complete_scan(struct iwl_priv *priv, bool aborted) 92 { 93 struct cfg80211_scan_info info = { 94 .aborted = aborted, 95 }; 96 97 /* check if scan was requested from mac80211 */ 98 if (priv->scan_request) { 99 IWL_DEBUG_SCAN(priv, "Complete scan in mac80211\n"); 100 ieee80211_scan_completed(priv->hw, &info); 101 } 102 103 priv->scan_type = IWL_SCAN_NORMAL; 104 priv->scan_vif = NULL; 105 priv->scan_request = NULL; 106 } 107 108 static void iwl_process_scan_complete(struct iwl_priv *priv) 109 { 110 bool aborted; 111 112 lockdep_assert_held(&priv->mutex); 113 114 if (!test_and_clear_bit(STATUS_SCAN_COMPLETE, &priv->status)) 115 return; 116 117 IWL_DEBUG_SCAN(priv, "Completed scan.\n"); 118 119 cancel_delayed_work(&priv->scan_check); 120 121 aborted = test_and_clear_bit(STATUS_SCAN_ABORTING, &priv->status); 122 if (aborted) 123 IWL_DEBUG_SCAN(priv, "Aborted scan completed.\n"); 124 125 if (!test_and_clear_bit(STATUS_SCANNING, &priv->status)) { 126 IWL_DEBUG_SCAN(priv, "Scan already completed.\n"); 127 goto out_settings; 128 } 129 130 if (priv->scan_type != IWL_SCAN_NORMAL && !aborted) { 131 int err; 132 133 /* Check if mac80211 requested scan during our internal scan */ 134 if (priv->scan_request == NULL) 135 goto out_complete; 136 137 /* If so request a new scan */ 138 err = iwl_scan_initiate(priv, priv->scan_vif, IWL_SCAN_NORMAL, 139 priv->scan_request->channels[0]->band); 140 if (err) { 141 IWL_DEBUG_SCAN(priv, 142 "failed to initiate pending scan: %d\n", err); 143 aborted = true; 144 goto out_complete; 145 } 146 147 return; 148 } 149 150 out_complete: 151 iwl_complete_scan(priv, aborted); 152 153 out_settings: 154 /* Can we still talk to firmware ? */ 155 if (!iwl_is_ready_rf(priv)) 156 return; 157 158 iwlagn_post_scan(priv); 159 } 160 161 void iwl_force_scan_end(struct iwl_priv *priv) 162 { 163 lockdep_assert_held(&priv->mutex); 164 165 if (!test_bit(STATUS_SCANNING, &priv->status)) { 166 IWL_DEBUG_SCAN(priv, "Forcing scan end while not scanning\n"); 167 return; 168 } 169 170 IWL_DEBUG_SCAN(priv, "Forcing scan end\n"); 171 clear_bit(STATUS_SCANNING, &priv->status); 172 clear_bit(STATUS_SCAN_HW, &priv->status); 173 clear_bit(STATUS_SCAN_ABORTING, &priv->status); 174 clear_bit(STATUS_SCAN_COMPLETE, &priv->status); 175 iwl_complete_scan(priv, true); 176 } 177 178 static void iwl_do_scan_abort(struct iwl_priv *priv) 179 { 180 int ret; 181 182 lockdep_assert_held(&priv->mutex); 183 184 if (!test_bit(STATUS_SCANNING, &priv->status)) { 185 IWL_DEBUG_SCAN(priv, "Not performing scan to abort\n"); 186 return; 187 } 188 189 if (test_and_set_bit(STATUS_SCAN_ABORTING, &priv->status)) { 190 IWL_DEBUG_SCAN(priv, "Scan abort in progress\n"); 191 return; 192 } 193 194 ret = iwl_send_scan_abort(priv); 195 if (ret) { 196 IWL_DEBUG_SCAN(priv, "Send scan abort failed %d\n", ret); 197 iwl_force_scan_end(priv); 198 } else 199 IWL_DEBUG_SCAN(priv, "Successfully send scan abort\n"); 200 } 201 202 /** 203 * iwl_scan_cancel - Cancel any currently executing HW scan 204 */ 205 int iwl_scan_cancel(struct iwl_priv *priv) 206 { 207 IWL_DEBUG_SCAN(priv, "Queuing abort scan\n"); 208 queue_work(priv->workqueue, &priv->abort_scan); 209 return 0; 210 } 211 212 /** 213 * iwl_scan_cancel_timeout - Cancel any currently executing HW scan 214 * @ms: amount of time to wait (in milliseconds) for scan to abort 215 * 216 */ 217 void iwl_scan_cancel_timeout(struct iwl_priv *priv, unsigned long ms) 218 { 219 unsigned long timeout = jiffies + msecs_to_jiffies(ms); 220 221 lockdep_assert_held(&priv->mutex); 222 223 IWL_DEBUG_SCAN(priv, "Scan cancel timeout\n"); 224 225 iwl_do_scan_abort(priv); 226 227 while (time_before_eq(jiffies, timeout)) { 228 if (!test_bit(STATUS_SCAN_HW, &priv->status)) 229 goto finished; 230 msleep(20); 231 } 232 233 return; 234 235 finished: 236 /* 237 * Now STATUS_SCAN_HW is clear. This means that the 238 * device finished, but the background work is going 239 * to execute at best as soon as we release the mutex. 240 * Since we need to be able to issue a new scan right 241 * after this function returns, run the complete here. 242 * The STATUS_SCAN_COMPLETE bit will then be cleared 243 * and prevent the background work from "completing" 244 * a possible new scan. 245 */ 246 iwl_process_scan_complete(priv); 247 } 248 249 /* Service response to REPLY_SCAN_CMD (0x80) */ 250 static void iwl_rx_reply_scan(struct iwl_priv *priv, 251 struct iwl_rx_cmd_buffer *rxb) 252 { 253 #ifdef CONFIG_IWLWIFI_DEBUG 254 struct iwl_rx_packet *pkt = rxb_addr(rxb); 255 struct iwl_scanreq_notification *notif = (void *)pkt->data; 256 257 IWL_DEBUG_SCAN(priv, "Scan request status = 0x%x\n", notif->status); 258 #endif 259 } 260 261 /* Service SCAN_START_NOTIFICATION (0x82) */ 262 static void iwl_rx_scan_start_notif(struct iwl_priv *priv, 263 struct iwl_rx_cmd_buffer *rxb) 264 { 265 struct iwl_rx_packet *pkt = rxb_addr(rxb); 266 struct iwl_scanstart_notification *notif = (void *)pkt->data; 267 268 priv->scan_start_tsf = le32_to_cpu(notif->tsf_low); 269 IWL_DEBUG_SCAN(priv, "Scan start: " 270 "%d [802.11%s] " 271 "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n", 272 notif->channel, 273 notif->band ? "bg" : "a", 274 le32_to_cpu(notif->tsf_high), 275 le32_to_cpu(notif->tsf_low), 276 notif->status, notif->beacon_timer); 277 } 278 279 /* Service SCAN_RESULTS_NOTIFICATION (0x83) */ 280 static void iwl_rx_scan_results_notif(struct iwl_priv *priv, 281 struct iwl_rx_cmd_buffer *rxb) 282 { 283 #ifdef CONFIG_IWLWIFI_DEBUG 284 struct iwl_rx_packet *pkt = rxb_addr(rxb); 285 struct iwl_scanresults_notification *notif = (void *)pkt->data; 286 287 IWL_DEBUG_SCAN(priv, "Scan ch.res: " 288 "%d [802.11%s] " 289 "probe status: %u:%u " 290 "(TSF: 0x%08X:%08X) - %d " 291 "elapsed=%lu usec\n", 292 notif->channel, 293 notif->band ? "bg" : "a", 294 notif->probe_status, notif->num_probe_not_sent, 295 le32_to_cpu(notif->tsf_high), 296 le32_to_cpu(notif->tsf_low), 297 le32_to_cpu(notif->statistics[0]), 298 le32_to_cpu(notif->tsf_low) - priv->scan_start_tsf); 299 #endif 300 } 301 302 /* Service SCAN_COMPLETE_NOTIFICATION (0x84) */ 303 static void iwl_rx_scan_complete_notif(struct iwl_priv *priv, 304 struct iwl_rx_cmd_buffer *rxb) 305 { 306 struct iwl_rx_packet *pkt = rxb_addr(rxb); 307 struct iwl_scancomplete_notification *scan_notif = (void *)pkt->data; 308 309 IWL_DEBUG_SCAN(priv, "Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n", 310 scan_notif->scanned_channels, 311 scan_notif->tsf_low, 312 scan_notif->tsf_high, scan_notif->status); 313 314 IWL_DEBUG_SCAN(priv, "Scan on %sGHz took %dms\n", 315 (priv->scan_band == NL80211_BAND_2GHZ) ? "2.4" : "5.2", 316 jiffies_to_msecs(jiffies - priv->scan_start)); 317 318 /* 319 * When aborting, we run the scan completed background work inline 320 * and the background work must then do nothing. The SCAN_COMPLETE 321 * bit helps implement that logic and thus needs to be set before 322 * queueing the work. Also, since the scan abort waits for SCAN_HW 323 * to clear, we need to set SCAN_COMPLETE before clearing SCAN_HW 324 * to avoid a race there. 325 */ 326 set_bit(STATUS_SCAN_COMPLETE, &priv->status); 327 clear_bit(STATUS_SCAN_HW, &priv->status); 328 queue_work(priv->workqueue, &priv->scan_completed); 329 330 if (priv->iw_mode != NL80211_IFTYPE_ADHOC && 331 iwl_advanced_bt_coexist(priv) && 332 priv->bt_status != scan_notif->bt_status) { 333 if (scan_notif->bt_status) { 334 /* BT on */ 335 if (!priv->bt_ch_announce) 336 priv->bt_traffic_load = 337 IWL_BT_COEX_TRAFFIC_LOAD_HIGH; 338 /* 339 * otherwise, no traffic load information provided 340 * no changes made 341 */ 342 } else { 343 /* BT off */ 344 priv->bt_traffic_load = 345 IWL_BT_COEX_TRAFFIC_LOAD_NONE; 346 } 347 priv->bt_status = scan_notif->bt_status; 348 queue_work(priv->workqueue, 349 &priv->bt_traffic_change_work); 350 } 351 } 352 353 void iwl_setup_rx_scan_handlers(struct iwl_priv *priv) 354 { 355 /* scan handlers */ 356 priv->rx_handlers[REPLY_SCAN_CMD] = iwl_rx_reply_scan; 357 priv->rx_handlers[SCAN_START_NOTIFICATION] = iwl_rx_scan_start_notif; 358 priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] = 359 iwl_rx_scan_results_notif; 360 priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] = 361 iwl_rx_scan_complete_notif; 362 } 363 364 static u16 iwl_get_active_dwell_time(struct iwl_priv *priv, 365 enum nl80211_band band, u8 n_probes) 366 { 367 if (band == NL80211_BAND_5GHZ) 368 return IWL_ACTIVE_DWELL_TIME_52 + 369 IWL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1); 370 else 371 return IWL_ACTIVE_DWELL_TIME_24 + 372 IWL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1); 373 } 374 375 static u16 iwl_limit_dwell(struct iwl_priv *priv, u16 dwell_time) 376 { 377 struct iwl_rxon_context *ctx; 378 int limits[NUM_IWL_RXON_CTX] = {}; 379 int n_active = 0; 380 u16 limit; 381 382 BUILD_BUG_ON(NUM_IWL_RXON_CTX != 2); 383 384 /* 385 * If we're associated, we clamp the dwell time 98% 386 * of the beacon interval (minus 2 * channel tune time) 387 * If both contexts are active, we have to restrict to 388 * 1/2 of the minimum of them, because they might be in 389 * lock-step with the time inbetween only half of what 390 * time we'd have in each of them. 391 */ 392 for_each_context(priv, ctx) { 393 switch (ctx->staging.dev_type) { 394 case RXON_DEV_TYPE_P2P: 395 /* no timing constraints */ 396 continue; 397 case RXON_DEV_TYPE_ESS: 398 default: 399 /* timing constraints if associated */ 400 if (!iwl_is_associated_ctx(ctx)) 401 continue; 402 break; 403 case RXON_DEV_TYPE_CP: 404 case RXON_DEV_TYPE_2STA: 405 /* 406 * These seem to always have timers for TBTT 407 * active in uCode even when not associated yet. 408 */ 409 break; 410 } 411 412 limits[n_active++] = ctx->beacon_int ?: IWL_PASSIVE_DWELL_BASE; 413 } 414 415 switch (n_active) { 416 case 0: 417 return dwell_time; 418 case 2: 419 limit = (limits[1] * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2; 420 limit /= 2; 421 dwell_time = min(limit, dwell_time); 422 /* fall through */ 423 case 1: 424 limit = (limits[0] * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2; 425 limit /= n_active; 426 return min(limit, dwell_time); 427 default: 428 WARN_ON_ONCE(1); 429 return dwell_time; 430 } 431 } 432 433 static u16 iwl_get_passive_dwell_time(struct iwl_priv *priv, 434 enum nl80211_band band) 435 { 436 u16 passive = (band == NL80211_BAND_2GHZ) ? 437 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 : 438 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52; 439 440 return iwl_limit_dwell(priv, passive); 441 } 442 443 /* Return valid, unused, channel for a passive scan to reset the RF */ 444 static u8 iwl_get_single_channel_number(struct iwl_priv *priv, 445 enum nl80211_band band) 446 { 447 struct ieee80211_supported_band *sband = priv->hw->wiphy->bands[band]; 448 struct iwl_rxon_context *ctx; 449 int i; 450 451 for (i = 0; i < sband->n_channels; i++) { 452 bool busy = false; 453 454 for_each_context(priv, ctx) { 455 busy = sband->channels[i].hw_value == 456 le16_to_cpu(ctx->staging.channel); 457 if (busy) 458 break; 459 } 460 461 if (busy) 462 continue; 463 464 if (!(sband->channels[i].flags & IEEE80211_CHAN_DISABLED)) 465 return sband->channels[i].hw_value; 466 } 467 468 return 0; 469 } 470 471 static int iwl_get_channel_for_reset_scan(struct iwl_priv *priv, 472 struct ieee80211_vif *vif, 473 enum nl80211_band band, 474 struct iwl_scan_channel *scan_ch) 475 { 476 const struct ieee80211_supported_band *sband; 477 u16 channel; 478 479 sband = iwl_get_hw_mode(priv, band); 480 if (!sband) { 481 IWL_ERR(priv, "invalid band\n"); 482 return 0; 483 } 484 485 channel = iwl_get_single_channel_number(priv, band); 486 if (channel) { 487 scan_ch->channel = cpu_to_le16(channel); 488 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE; 489 scan_ch->active_dwell = 490 cpu_to_le16(IWL_RADIO_RESET_DWELL_TIME); 491 scan_ch->passive_dwell = 492 cpu_to_le16(IWL_RADIO_RESET_DWELL_TIME); 493 /* Set txpower levels to defaults */ 494 scan_ch->dsp_atten = 110; 495 if (band == NL80211_BAND_5GHZ) 496 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3; 497 else 498 scan_ch->tx_gain = ((1 << 5) | (5 << 3)); 499 return 1; 500 } 501 502 IWL_ERR(priv, "no valid channel found\n"); 503 return 0; 504 } 505 506 static int iwl_get_channels_for_scan(struct iwl_priv *priv, 507 struct ieee80211_vif *vif, 508 enum nl80211_band band, 509 u8 is_active, u8 n_probes, 510 struct iwl_scan_channel *scan_ch) 511 { 512 struct ieee80211_channel *chan; 513 const struct ieee80211_supported_band *sband; 514 u16 passive_dwell = 0; 515 u16 active_dwell = 0; 516 int added, i; 517 u16 channel; 518 519 sband = iwl_get_hw_mode(priv, band); 520 if (!sband) 521 return 0; 522 523 active_dwell = iwl_get_active_dwell_time(priv, band, n_probes); 524 passive_dwell = iwl_get_passive_dwell_time(priv, band); 525 526 if (passive_dwell <= active_dwell) 527 passive_dwell = active_dwell + 1; 528 529 for (i = 0, added = 0; i < priv->scan_request->n_channels; i++) { 530 chan = priv->scan_request->channels[i]; 531 532 if (chan->band != band) 533 continue; 534 535 channel = chan->hw_value; 536 scan_ch->channel = cpu_to_le16(channel); 537 538 if (!is_active || (chan->flags & IEEE80211_CHAN_NO_IR)) 539 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE; 540 else 541 scan_ch->type = SCAN_CHANNEL_TYPE_ACTIVE; 542 543 if (n_probes) 544 scan_ch->type |= IWL_SCAN_PROBE_MASK(n_probes); 545 546 scan_ch->active_dwell = cpu_to_le16(active_dwell); 547 scan_ch->passive_dwell = cpu_to_le16(passive_dwell); 548 549 /* Set txpower levels to defaults */ 550 scan_ch->dsp_atten = 110; 551 552 /* NOTE: if we were doing 6Mb OFDM for scans we'd use 553 * power level: 554 * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3; 555 */ 556 if (band == NL80211_BAND_5GHZ) 557 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3; 558 else 559 scan_ch->tx_gain = ((1 << 5) | (5 << 3)); 560 561 IWL_DEBUG_SCAN(priv, "Scanning ch=%d prob=0x%X [%s %d]\n", 562 channel, le32_to_cpu(scan_ch->type), 563 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ? 564 "ACTIVE" : "PASSIVE", 565 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ? 566 active_dwell : passive_dwell); 567 568 scan_ch++; 569 added++; 570 } 571 572 IWL_DEBUG_SCAN(priv, "total channels to scan %d\n", added); 573 return added; 574 } 575 576 /** 577 * iwl_fill_probe_req - fill in all required fields and IE for probe request 578 */ 579 580 static u16 iwl_fill_probe_req(struct ieee80211_mgmt *frame, const u8 *ta, 581 const u8 *ies, int ie_len, const u8 *ssid, 582 u8 ssid_len, int left) 583 { 584 int len = 0; 585 u8 *pos = NULL; 586 587 /* Make sure there is enough space for the probe request, 588 * two mandatory IEs and the data */ 589 left -= 24; 590 if (left < 0) 591 return 0; 592 593 frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ); 594 eth_broadcast_addr(frame->da); 595 memcpy(frame->sa, ta, ETH_ALEN); 596 eth_broadcast_addr(frame->bssid); 597 frame->seq_ctrl = 0; 598 599 len += 24; 600 601 /* ...next IE... */ 602 pos = &frame->u.probe_req.variable[0]; 603 604 /* fill in our SSID IE */ 605 left -= ssid_len + 2; 606 if (left < 0) 607 return 0; 608 *pos++ = WLAN_EID_SSID; 609 *pos++ = ssid_len; 610 if (ssid && ssid_len) { 611 memcpy(pos, ssid, ssid_len); 612 pos += ssid_len; 613 } 614 615 len += ssid_len + 2; 616 617 if (WARN_ON(left < ie_len)) 618 return len; 619 620 if (ies && ie_len) { 621 memcpy(pos, ies, ie_len); 622 len += ie_len; 623 } 624 625 return (u16)len; 626 } 627 628 static int iwlagn_request_scan(struct iwl_priv *priv, struct ieee80211_vif *vif) 629 { 630 struct iwl_host_cmd cmd = { 631 .id = REPLY_SCAN_CMD, 632 .len = { sizeof(struct iwl_scan_cmd), }, 633 }; 634 struct iwl_scan_cmd *scan; 635 struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS]; 636 u32 rate_flags = 0; 637 u16 cmd_len = 0; 638 u16 rx_chain = 0; 639 enum nl80211_band band; 640 u8 n_probes = 0; 641 u8 rx_ant = priv->nvm_data->valid_rx_ant; 642 u8 rate; 643 bool is_active = false; 644 int chan_mod; 645 u8 active_chains; 646 u8 scan_tx_antennas = priv->nvm_data->valid_tx_ant; 647 int ret; 648 int scan_cmd_size = sizeof(struct iwl_scan_cmd) + 649 MAX_SCAN_CHANNEL * sizeof(struct iwl_scan_channel) + 650 priv->fw->ucode_capa.max_probe_length; 651 const u8 *ssid = NULL; 652 u8 ssid_len = 0; 653 654 if (WARN_ON(priv->scan_type == IWL_SCAN_NORMAL && 655 (!priv->scan_request || 656 priv->scan_request->n_channels > MAX_SCAN_CHANNEL))) 657 return -EINVAL; 658 659 lockdep_assert_held(&priv->mutex); 660 661 if (vif) 662 ctx = iwl_rxon_ctx_from_vif(vif); 663 664 if (!priv->scan_cmd) { 665 priv->scan_cmd = kmalloc(scan_cmd_size, GFP_KERNEL); 666 if (!priv->scan_cmd) { 667 IWL_DEBUG_SCAN(priv, 668 "fail to allocate memory for scan\n"); 669 return -ENOMEM; 670 } 671 } 672 scan = priv->scan_cmd; 673 memset(scan, 0, scan_cmd_size); 674 675 scan->quiet_plcp_th = IWL_PLCP_QUIET_THRESH; 676 scan->quiet_time = IWL_ACTIVE_QUIET_TIME; 677 678 if (iwl_is_any_associated(priv)) { 679 u16 interval = 0; 680 u32 extra; 681 u32 suspend_time = 100; 682 u32 scan_suspend_time = 100; 683 684 IWL_DEBUG_INFO(priv, "Scanning while associated...\n"); 685 switch (priv->scan_type) { 686 case IWL_SCAN_RADIO_RESET: 687 interval = 0; 688 break; 689 case IWL_SCAN_NORMAL: 690 interval = vif->bss_conf.beacon_int; 691 break; 692 } 693 694 scan->suspend_time = 0; 695 scan->max_out_time = cpu_to_le32(200 * 1024); 696 if (!interval) 697 interval = suspend_time; 698 699 extra = (suspend_time / interval) << 22; 700 scan_suspend_time = (extra | 701 ((suspend_time % interval) * 1024)); 702 scan->suspend_time = cpu_to_le32(scan_suspend_time); 703 IWL_DEBUG_SCAN(priv, "suspend_time 0x%X beacon interval %d\n", 704 scan_suspend_time, interval); 705 } 706 707 switch (priv->scan_type) { 708 case IWL_SCAN_RADIO_RESET: 709 IWL_DEBUG_SCAN(priv, "Start internal passive scan.\n"); 710 /* 711 * Override quiet time as firmware checks that active 712 * dwell is >= quiet; since we use passive scan it'll 713 * not actually be used. 714 */ 715 scan->quiet_time = cpu_to_le16(IWL_RADIO_RESET_DWELL_TIME); 716 break; 717 case IWL_SCAN_NORMAL: 718 if (priv->scan_request->n_ssids) { 719 int i, p = 0; 720 IWL_DEBUG_SCAN(priv, "Kicking off active scan\n"); 721 /* 722 * The highest priority SSID is inserted to the 723 * probe request template. 724 */ 725 ssid_len = priv->scan_request->ssids[0].ssid_len; 726 ssid = priv->scan_request->ssids[0].ssid; 727 728 /* 729 * Invert the order of ssids, the firmware will invert 730 * it back. 731 */ 732 for (i = priv->scan_request->n_ssids - 1; i >= 1; i--) { 733 scan->direct_scan[p].id = WLAN_EID_SSID; 734 scan->direct_scan[p].len = 735 priv->scan_request->ssids[i].ssid_len; 736 memcpy(scan->direct_scan[p].ssid, 737 priv->scan_request->ssids[i].ssid, 738 priv->scan_request->ssids[i].ssid_len); 739 n_probes++; 740 p++; 741 } 742 is_active = true; 743 } else 744 IWL_DEBUG_SCAN(priv, "Start passive scan.\n"); 745 break; 746 } 747 748 scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK; 749 scan->tx_cmd.sta_id = ctx->bcast_sta_id; 750 scan->tx_cmd.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE; 751 752 switch (priv->scan_band) { 753 case NL80211_BAND_2GHZ: 754 scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK; 755 chan_mod = le32_to_cpu( 756 priv->contexts[IWL_RXON_CTX_BSS].active.flags & 757 RXON_FLG_CHANNEL_MODE_MSK) 758 >> RXON_FLG_CHANNEL_MODE_POS; 759 if ((priv->scan_request && priv->scan_request->no_cck) || 760 chan_mod == CHANNEL_MODE_PURE_40) { 761 rate = IWL_RATE_6M_PLCP; 762 } else { 763 rate = IWL_RATE_1M_PLCP; 764 rate_flags = RATE_MCS_CCK_MSK; 765 } 766 /* 767 * Internal scans are passive, so we can indiscriminately set 768 * the BT ignore flag on 2.4 GHz since it applies to TX only. 769 */ 770 if (priv->lib->bt_params && 771 priv->lib->bt_params->advanced_bt_coexist) 772 scan->tx_cmd.tx_flags |= TX_CMD_FLG_IGNORE_BT; 773 break; 774 case NL80211_BAND_5GHZ: 775 rate = IWL_RATE_6M_PLCP; 776 break; 777 default: 778 IWL_WARN(priv, "Invalid scan band\n"); 779 return -EIO; 780 } 781 782 /* 783 * If active scanning is requested but a certain channel is 784 * marked passive, we can do active scanning if we detect 785 * transmissions. 786 * 787 * There is an issue with some firmware versions that triggers 788 * a sysassert on a "good CRC threshold" of zero (== disabled), 789 * on a radar channel even though this means that we should NOT 790 * send probes. 791 * 792 * The "good CRC threshold" is the number of frames that we 793 * need to receive during our dwell time on a channel before 794 * sending out probes -- setting this to a huge value will 795 * mean we never reach it, but at the same time work around 796 * the aforementioned issue. Thus use IWL_GOOD_CRC_TH_NEVER 797 * here instead of IWL_GOOD_CRC_TH_DISABLED. 798 * 799 * This was fixed in later versions along with some other 800 * scan changes, and the threshold behaves as a flag in those 801 * versions. 802 */ 803 if (priv->new_scan_threshold_behaviour) 804 scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH_DEFAULT : 805 IWL_GOOD_CRC_TH_DISABLED; 806 else 807 scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH_DEFAULT : 808 IWL_GOOD_CRC_TH_NEVER; 809 810 band = priv->scan_band; 811 812 if (band == NL80211_BAND_2GHZ && 813 priv->lib->bt_params && 814 priv->lib->bt_params->advanced_bt_coexist) { 815 /* transmit 2.4 GHz probes only on first antenna */ 816 scan_tx_antennas = first_antenna(scan_tx_antennas); 817 } 818 819 priv->scan_tx_ant[band] = iwl_toggle_tx_ant(priv, 820 priv->scan_tx_ant[band], 821 scan_tx_antennas); 822 rate_flags |= iwl_ant_idx_to_flags(priv->scan_tx_ant[band]); 823 scan->tx_cmd.rate_n_flags = iwl_hw_set_rate_n_flags(rate, rate_flags); 824 825 /* 826 * In power save mode while associated use one chain, 827 * otherwise use all chains 828 */ 829 if (test_bit(STATUS_POWER_PMI, &priv->status) && 830 !(priv->hw->conf.flags & IEEE80211_CONF_IDLE)) { 831 /* rx_ant has been set to all valid chains previously */ 832 active_chains = rx_ant & 833 ((u8)(priv->chain_noise_data.active_chains)); 834 if (!active_chains) 835 active_chains = rx_ant; 836 837 IWL_DEBUG_SCAN(priv, "chain_noise_data.active_chains: %u\n", 838 priv->chain_noise_data.active_chains); 839 840 rx_ant = first_antenna(active_chains); 841 } 842 if (priv->lib->bt_params && 843 priv->lib->bt_params->advanced_bt_coexist && 844 priv->bt_full_concurrent) { 845 /* operated as 1x1 in full concurrency mode */ 846 rx_ant = first_antenna(rx_ant); 847 } 848 849 /* MIMO is not used here, but value is required */ 850 rx_chain |= 851 priv->nvm_data->valid_rx_ant << RXON_RX_CHAIN_VALID_POS; 852 rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_MIMO_SEL_POS; 853 rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_SEL_POS; 854 rx_chain |= 0x1 << RXON_RX_CHAIN_DRIVER_FORCE_POS; 855 scan->rx_chain = cpu_to_le16(rx_chain); 856 switch (priv->scan_type) { 857 case IWL_SCAN_NORMAL: 858 cmd_len = iwl_fill_probe_req( 859 (struct ieee80211_mgmt *)scan->data, 860 vif->addr, 861 priv->scan_request->ie, 862 priv->scan_request->ie_len, 863 ssid, ssid_len, 864 scan_cmd_size - sizeof(*scan)); 865 break; 866 case IWL_SCAN_RADIO_RESET: 867 /* use bcast addr, will not be transmitted but must be valid */ 868 cmd_len = iwl_fill_probe_req( 869 (struct ieee80211_mgmt *)scan->data, 870 iwl_bcast_addr, NULL, 0, 871 NULL, 0, 872 scan_cmd_size - sizeof(*scan)); 873 break; 874 default: 875 BUG(); 876 } 877 scan->tx_cmd.len = cpu_to_le16(cmd_len); 878 879 scan->filter_flags |= (RXON_FILTER_ACCEPT_GRP_MSK | 880 RXON_FILTER_BCON_AWARE_MSK); 881 882 switch (priv->scan_type) { 883 case IWL_SCAN_RADIO_RESET: 884 scan->channel_count = 885 iwl_get_channel_for_reset_scan(priv, vif, band, 886 (void *)&scan->data[cmd_len]); 887 break; 888 case IWL_SCAN_NORMAL: 889 scan->channel_count = 890 iwl_get_channels_for_scan(priv, vif, band, 891 is_active, n_probes, 892 (void *)&scan->data[cmd_len]); 893 break; 894 } 895 896 if (scan->channel_count == 0) { 897 IWL_DEBUG_SCAN(priv, "channel count %d\n", scan->channel_count); 898 return -EIO; 899 } 900 901 cmd.len[0] += le16_to_cpu(scan->tx_cmd.len) + 902 scan->channel_count * sizeof(struct iwl_scan_channel); 903 cmd.data[0] = scan; 904 cmd.dataflags[0] = IWL_HCMD_DFL_NOCOPY; 905 scan->len = cpu_to_le16(cmd.len[0]); 906 907 /* set scan bit here for PAN params */ 908 set_bit(STATUS_SCAN_HW, &priv->status); 909 910 ret = iwlagn_set_pan_params(priv); 911 if (ret) { 912 clear_bit(STATUS_SCAN_HW, &priv->status); 913 return ret; 914 } 915 916 ret = iwl_dvm_send_cmd(priv, &cmd); 917 if (ret) { 918 clear_bit(STATUS_SCAN_HW, &priv->status); 919 iwlagn_set_pan_params(priv); 920 } 921 922 return ret; 923 } 924 925 void iwl_init_scan_params(struct iwl_priv *priv) 926 { 927 u8 ant_idx = fls(priv->nvm_data->valid_tx_ant) - 1; 928 if (!priv->scan_tx_ant[NL80211_BAND_5GHZ]) 929 priv->scan_tx_ant[NL80211_BAND_5GHZ] = ant_idx; 930 if (!priv->scan_tx_ant[NL80211_BAND_2GHZ]) 931 priv->scan_tx_ant[NL80211_BAND_2GHZ] = ant_idx; 932 } 933 934 int __must_check iwl_scan_initiate(struct iwl_priv *priv, 935 struct ieee80211_vif *vif, 936 enum iwl_scan_type scan_type, 937 enum nl80211_band band) 938 { 939 int ret; 940 941 lockdep_assert_held(&priv->mutex); 942 943 cancel_delayed_work(&priv->scan_check); 944 945 if (!iwl_is_ready_rf(priv)) { 946 IWL_WARN(priv, "Request scan called when driver not ready.\n"); 947 return -EIO; 948 } 949 950 if (test_bit(STATUS_SCAN_HW, &priv->status)) { 951 IWL_DEBUG_SCAN(priv, 952 "Multiple concurrent scan requests in parallel.\n"); 953 return -EBUSY; 954 } 955 956 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) { 957 IWL_DEBUG_SCAN(priv, "Scan request while abort pending.\n"); 958 return -EBUSY; 959 } 960 961 IWL_DEBUG_SCAN(priv, "Starting %sscan...\n", 962 scan_type == IWL_SCAN_NORMAL ? "" : 963 "internal short "); 964 965 set_bit(STATUS_SCANNING, &priv->status); 966 priv->scan_type = scan_type; 967 priv->scan_start = jiffies; 968 priv->scan_band = band; 969 970 ret = iwlagn_request_scan(priv, vif); 971 if (ret) { 972 clear_bit(STATUS_SCANNING, &priv->status); 973 priv->scan_type = IWL_SCAN_NORMAL; 974 return ret; 975 } 976 977 queue_delayed_work(priv->workqueue, &priv->scan_check, 978 IWL_SCAN_CHECK_WATCHDOG); 979 980 return 0; 981 } 982 983 984 /* 985 * internal short scan, this function should only been called while associated. 986 * It will reset and tune the radio to prevent possible RF related problem 987 */ 988 void iwl_internal_short_hw_scan(struct iwl_priv *priv) 989 { 990 queue_work(priv->workqueue, &priv->start_internal_scan); 991 } 992 993 static void iwl_bg_start_internal_scan(struct work_struct *work) 994 { 995 struct iwl_priv *priv = 996 container_of(work, struct iwl_priv, start_internal_scan); 997 998 IWL_DEBUG_SCAN(priv, "Start internal scan\n"); 999 1000 mutex_lock(&priv->mutex); 1001 1002 if (priv->scan_type == IWL_SCAN_RADIO_RESET) { 1003 IWL_DEBUG_SCAN(priv, "Internal scan already in progress\n"); 1004 goto unlock; 1005 } 1006 1007 if (test_bit(STATUS_SCANNING, &priv->status)) { 1008 IWL_DEBUG_SCAN(priv, "Scan already in progress.\n"); 1009 goto unlock; 1010 } 1011 1012 if (iwl_scan_initiate(priv, NULL, IWL_SCAN_RADIO_RESET, priv->band)) 1013 IWL_DEBUG_SCAN(priv, "failed to start internal short scan\n"); 1014 unlock: 1015 mutex_unlock(&priv->mutex); 1016 } 1017 1018 static void iwl_bg_scan_check(struct work_struct *data) 1019 { 1020 struct iwl_priv *priv = 1021 container_of(data, struct iwl_priv, scan_check.work); 1022 1023 IWL_DEBUG_SCAN(priv, "Scan check work\n"); 1024 1025 /* Since we are here firmware does not finish scan and 1026 * most likely is in bad shape, so we don't bother to 1027 * send abort command, just force scan complete to mac80211 */ 1028 mutex_lock(&priv->mutex); 1029 iwl_force_scan_end(priv); 1030 mutex_unlock(&priv->mutex); 1031 } 1032 1033 static void iwl_bg_abort_scan(struct work_struct *work) 1034 { 1035 struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan); 1036 1037 IWL_DEBUG_SCAN(priv, "Abort scan work\n"); 1038 1039 /* We keep scan_check work queued in case when firmware will not 1040 * report back scan completed notification */ 1041 mutex_lock(&priv->mutex); 1042 iwl_scan_cancel_timeout(priv, 200); 1043 mutex_unlock(&priv->mutex); 1044 } 1045 1046 static void iwl_bg_scan_completed(struct work_struct *work) 1047 { 1048 struct iwl_priv *priv = 1049 container_of(work, struct iwl_priv, scan_completed); 1050 1051 mutex_lock(&priv->mutex); 1052 iwl_process_scan_complete(priv); 1053 mutex_unlock(&priv->mutex); 1054 } 1055 1056 void iwl_setup_scan_deferred_work(struct iwl_priv *priv) 1057 { 1058 INIT_WORK(&priv->scan_completed, iwl_bg_scan_completed); 1059 INIT_WORK(&priv->abort_scan, iwl_bg_abort_scan); 1060 INIT_WORK(&priv->start_internal_scan, iwl_bg_start_internal_scan); 1061 INIT_DELAYED_WORK(&priv->scan_check, iwl_bg_scan_check); 1062 } 1063 1064 void iwl_cancel_scan_deferred_work(struct iwl_priv *priv) 1065 { 1066 cancel_work_sync(&priv->start_internal_scan); 1067 cancel_work_sync(&priv->abort_scan); 1068 cancel_work_sync(&priv->scan_completed); 1069 1070 if (cancel_delayed_work_sync(&priv->scan_check)) { 1071 mutex_lock(&priv->mutex); 1072 iwl_force_scan_end(priv); 1073 mutex_unlock(&priv->mutex); 1074 } 1075 } 1076