1 /****************************************************************************** 2 * 3 * GPL LICENSE SUMMARY 4 * 5 * Copyright(c) 2008 - 2014 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 COPYING. 23 * 24 * Contact Information: 25 * Intel Linux Wireless <linuxwifi@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 "dev.h" 34 #include "agn.h" 35 36 /* For active scan, listen ACTIVE_DWELL_TIME (msec) on each channel after 37 * sending probe req. This should be set long enough to hear probe responses 38 * from more than one AP. */ 39 #define IWL_ACTIVE_DWELL_TIME_24 (30) /* all times in msec */ 40 #define IWL_ACTIVE_DWELL_TIME_52 (20) 41 42 #define IWL_ACTIVE_DWELL_FACTOR_24GHZ (3) 43 #define IWL_ACTIVE_DWELL_FACTOR_52GHZ (2) 44 45 /* For passive scan, listen PASSIVE_DWELL_TIME (msec) on each channel. 46 * Must be set longer than active dwell time. 47 * For the most reliable scan, set > AP beacon interval (typically 100msec). */ 48 #define IWL_PASSIVE_DWELL_TIME_24 (20) /* all times in msec */ 49 #define IWL_PASSIVE_DWELL_TIME_52 (10) 50 #define IWL_PASSIVE_DWELL_BASE (100) 51 #define IWL_CHANNEL_TUNE_TIME 5 52 #define MAX_SCAN_CHANNEL 50 53 54 /* For reset radio, need minimal dwell time only */ 55 #define IWL_RADIO_RESET_DWELL_TIME 5 56 57 static 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_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_SCAN_HW, &priv->status) || 71 test_bit(STATUS_FW_ERROR, &priv->status)) 72 return -EIO; 73 74 ret = iwl_dvm_send_cmd(priv, &cmd); 75 if (ret) 76 return ret; 77 78 status = (void *)cmd.resp_pkt->data; 79 if (*status != CAN_ABORT_STATUS) { 80 /* The scan abort will return 1 for success or 81 * 2 for "failure". A failure condition can be 82 * due to simply not being in an active scan which 83 * can occur if we send the scan abort before we 84 * the microcode has notified us that a scan is 85 * completed. */ 86 IWL_DEBUG_SCAN(priv, "SCAN_ABORT ret %d.\n", 87 le32_to_cpu(*status)); 88 ret = -EIO; 89 } 90 91 iwl_free_resp(&cmd); 92 return ret; 93 } 94 95 static void iwl_complete_scan(struct iwl_priv *priv, bool aborted) 96 { 97 struct cfg80211_scan_info info = { 98 .aborted = aborted, 99 }; 100 101 /* check if scan was requested from mac80211 */ 102 if (priv->scan_request) { 103 IWL_DEBUG_SCAN(priv, "Complete scan in mac80211\n"); 104 ieee80211_scan_completed(priv->hw, &info); 105 } 106 107 priv->scan_type = IWL_SCAN_NORMAL; 108 priv->scan_vif = NULL; 109 priv->scan_request = NULL; 110 } 111 112 static void iwl_process_scan_complete(struct iwl_priv *priv) 113 { 114 bool aborted; 115 116 lockdep_assert_held(&priv->mutex); 117 118 if (!test_and_clear_bit(STATUS_SCAN_COMPLETE, &priv->status)) 119 return; 120 121 IWL_DEBUG_SCAN(priv, "Completed scan.\n"); 122 123 cancel_delayed_work(&priv->scan_check); 124 125 aborted = test_and_clear_bit(STATUS_SCAN_ABORTING, &priv->status); 126 if (aborted) 127 IWL_DEBUG_SCAN(priv, "Aborted scan completed.\n"); 128 129 if (!test_and_clear_bit(STATUS_SCANNING, &priv->status)) { 130 IWL_DEBUG_SCAN(priv, "Scan already completed.\n"); 131 goto out_settings; 132 } 133 134 if (priv->scan_type != IWL_SCAN_NORMAL && !aborted) { 135 int err; 136 137 /* Check if mac80211 requested scan during our internal scan */ 138 if (priv->scan_request == NULL) 139 goto out_complete; 140 141 /* If so request a new scan */ 142 err = iwl_scan_initiate(priv, priv->scan_vif, IWL_SCAN_NORMAL, 143 priv->scan_request->channels[0]->band); 144 if (err) { 145 IWL_DEBUG_SCAN(priv, 146 "failed to initiate pending scan: %d\n", err); 147 aborted = true; 148 goto out_complete; 149 } 150 151 return; 152 } 153 154 out_complete: 155 iwl_complete_scan(priv, aborted); 156 157 out_settings: 158 /* Can we still talk to firmware ? */ 159 if (!iwl_is_ready_rf(priv)) 160 return; 161 162 iwlagn_post_scan(priv); 163 } 164 165 void iwl_force_scan_end(struct iwl_priv *priv) 166 { 167 lockdep_assert_held(&priv->mutex); 168 169 if (!test_bit(STATUS_SCANNING, &priv->status)) { 170 IWL_DEBUG_SCAN(priv, "Forcing scan end while not scanning\n"); 171 return; 172 } 173 174 IWL_DEBUG_SCAN(priv, "Forcing scan end\n"); 175 clear_bit(STATUS_SCANNING, &priv->status); 176 clear_bit(STATUS_SCAN_HW, &priv->status); 177 clear_bit(STATUS_SCAN_ABORTING, &priv->status); 178 clear_bit(STATUS_SCAN_COMPLETE, &priv->status); 179 iwl_complete_scan(priv, true); 180 } 181 182 static void iwl_do_scan_abort(struct iwl_priv *priv) 183 { 184 int ret; 185 186 lockdep_assert_held(&priv->mutex); 187 188 if (!test_bit(STATUS_SCANNING, &priv->status)) { 189 IWL_DEBUG_SCAN(priv, "Not performing scan to abort\n"); 190 return; 191 } 192 193 if (test_and_set_bit(STATUS_SCAN_ABORTING, &priv->status)) { 194 IWL_DEBUG_SCAN(priv, "Scan abort in progress\n"); 195 return; 196 } 197 198 ret = iwl_send_scan_abort(priv); 199 if (ret) { 200 IWL_DEBUG_SCAN(priv, "Send scan abort failed %d\n", ret); 201 iwl_force_scan_end(priv); 202 } else 203 IWL_DEBUG_SCAN(priv, "Successfully send scan abort\n"); 204 } 205 206 /** 207 * iwl_scan_cancel - Cancel any currently executing HW scan 208 */ 209 int iwl_scan_cancel(struct iwl_priv *priv) 210 { 211 IWL_DEBUG_SCAN(priv, "Queuing abort scan\n"); 212 queue_work(priv->workqueue, &priv->abort_scan); 213 return 0; 214 } 215 216 /** 217 * iwl_scan_cancel_timeout - Cancel any currently executing HW scan 218 * @ms: amount of time to wait (in milliseconds) for scan to abort 219 * 220 */ 221 void iwl_scan_cancel_timeout(struct iwl_priv *priv, unsigned long ms) 222 { 223 unsigned long timeout = jiffies + msecs_to_jiffies(ms); 224 225 lockdep_assert_held(&priv->mutex); 226 227 IWL_DEBUG_SCAN(priv, "Scan cancel timeout\n"); 228 229 iwl_do_scan_abort(priv); 230 231 while (time_before_eq(jiffies, timeout)) { 232 if (!test_bit(STATUS_SCAN_HW, &priv->status)) 233 goto finished; 234 msleep(20); 235 } 236 237 return; 238 239 finished: 240 /* 241 * Now STATUS_SCAN_HW is clear. This means that the 242 * device finished, but the background work is going 243 * to execute at best as soon as we release the mutex. 244 * Since we need to be able to issue a new scan right 245 * after this function returns, run the complete here. 246 * The STATUS_SCAN_COMPLETE bit will then be cleared 247 * and prevent the background work from "completing" 248 * a possible new scan. 249 */ 250 iwl_process_scan_complete(priv); 251 } 252 253 /* Service response to REPLY_SCAN_CMD (0x80) */ 254 static void iwl_rx_reply_scan(struct iwl_priv *priv, 255 struct iwl_rx_cmd_buffer *rxb) 256 { 257 #ifdef CONFIG_IWLWIFI_DEBUG 258 struct iwl_rx_packet *pkt = rxb_addr(rxb); 259 struct iwl_scanreq_notification *notif = (void *)pkt->data; 260 261 IWL_DEBUG_SCAN(priv, "Scan request status = 0x%x\n", notif->status); 262 #endif 263 } 264 265 /* Service SCAN_START_NOTIFICATION (0x82) */ 266 static void iwl_rx_scan_start_notif(struct iwl_priv *priv, 267 struct iwl_rx_cmd_buffer *rxb) 268 { 269 struct iwl_rx_packet *pkt = rxb_addr(rxb); 270 struct iwl_scanstart_notification *notif = (void *)pkt->data; 271 272 priv->scan_start_tsf = le32_to_cpu(notif->tsf_low); 273 IWL_DEBUG_SCAN(priv, "Scan start: " 274 "%d [802.11%s] " 275 "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n", 276 notif->channel, 277 notif->band ? "bg" : "a", 278 le32_to_cpu(notif->tsf_high), 279 le32_to_cpu(notif->tsf_low), 280 notif->status, notif->beacon_timer); 281 } 282 283 /* Service SCAN_RESULTS_NOTIFICATION (0x83) */ 284 static void iwl_rx_scan_results_notif(struct iwl_priv *priv, 285 struct iwl_rx_cmd_buffer *rxb) 286 { 287 #ifdef CONFIG_IWLWIFI_DEBUG 288 struct iwl_rx_packet *pkt = rxb_addr(rxb); 289 struct iwl_scanresults_notification *notif = (void *)pkt->data; 290 291 IWL_DEBUG_SCAN(priv, "Scan ch.res: " 292 "%d [802.11%s] " 293 "probe status: %u:%u " 294 "(TSF: 0x%08X:%08X) - %d " 295 "elapsed=%lu usec\n", 296 notif->channel, 297 notif->band ? "bg" : "a", 298 notif->probe_status, notif->num_probe_not_sent, 299 le32_to_cpu(notif->tsf_high), 300 le32_to_cpu(notif->tsf_low), 301 le32_to_cpu(notif->statistics[0]), 302 le32_to_cpu(notif->tsf_low) - priv->scan_start_tsf); 303 #endif 304 } 305 306 /* Service SCAN_COMPLETE_NOTIFICATION (0x84) */ 307 static void iwl_rx_scan_complete_notif(struct iwl_priv *priv, 308 struct iwl_rx_cmd_buffer *rxb) 309 { 310 struct iwl_rx_packet *pkt = rxb_addr(rxb); 311 struct iwl_scancomplete_notification *scan_notif = (void *)pkt->data; 312 313 IWL_DEBUG_SCAN(priv, "Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n", 314 scan_notif->scanned_channels, 315 scan_notif->tsf_low, 316 scan_notif->tsf_high, scan_notif->status); 317 318 IWL_DEBUG_SCAN(priv, "Scan on %sGHz took %dms\n", 319 (priv->scan_band == NL80211_BAND_2GHZ) ? "2.4" : "5.2", 320 jiffies_to_msecs(jiffies - priv->scan_start)); 321 322 /* 323 * When aborting, we run the scan completed background work inline 324 * and the background work must then do nothing. The SCAN_COMPLETE 325 * bit helps implement that logic and thus needs to be set before 326 * queueing the work. Also, since the scan abort waits for SCAN_HW 327 * to clear, we need to set SCAN_COMPLETE before clearing SCAN_HW 328 * to avoid a race there. 329 */ 330 set_bit(STATUS_SCAN_COMPLETE, &priv->status); 331 clear_bit(STATUS_SCAN_HW, &priv->status); 332 queue_work(priv->workqueue, &priv->scan_completed); 333 334 if (priv->iw_mode != NL80211_IFTYPE_ADHOC && 335 iwl_advanced_bt_coexist(priv) && 336 priv->bt_status != scan_notif->bt_status) { 337 if (scan_notif->bt_status) { 338 /* BT on */ 339 if (!priv->bt_ch_announce) 340 priv->bt_traffic_load = 341 IWL_BT_COEX_TRAFFIC_LOAD_HIGH; 342 /* 343 * otherwise, no traffic load information provided 344 * no changes made 345 */ 346 } else { 347 /* BT off */ 348 priv->bt_traffic_load = 349 IWL_BT_COEX_TRAFFIC_LOAD_NONE; 350 } 351 priv->bt_status = scan_notif->bt_status; 352 queue_work(priv->workqueue, 353 &priv->bt_traffic_change_work); 354 } 355 } 356 357 void iwl_setup_rx_scan_handlers(struct iwl_priv *priv) 358 { 359 /* scan handlers */ 360 priv->rx_handlers[REPLY_SCAN_CMD] = iwl_rx_reply_scan; 361 priv->rx_handlers[SCAN_START_NOTIFICATION] = iwl_rx_scan_start_notif; 362 priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] = 363 iwl_rx_scan_results_notif; 364 priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] = 365 iwl_rx_scan_complete_notif; 366 } 367 368 static u16 iwl_get_active_dwell_time(struct iwl_priv *priv, 369 enum nl80211_band band, u8 n_probes) 370 { 371 if (band == NL80211_BAND_5GHZ) 372 return IWL_ACTIVE_DWELL_TIME_52 + 373 IWL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1); 374 else 375 return IWL_ACTIVE_DWELL_TIME_24 + 376 IWL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1); 377 } 378 379 static u16 iwl_limit_dwell(struct iwl_priv *priv, u16 dwell_time) 380 { 381 struct iwl_rxon_context *ctx; 382 int limits[NUM_IWL_RXON_CTX] = {}; 383 int n_active = 0; 384 u16 limit; 385 386 BUILD_BUG_ON(NUM_IWL_RXON_CTX != 2); 387 388 /* 389 * If we're associated, we clamp the dwell time 98% 390 * of the beacon interval (minus 2 * channel tune time) 391 * If both contexts are active, we have to restrict to 392 * 1/2 of the minimum of them, because they might be in 393 * lock-step with the time inbetween only half of what 394 * time we'd have in each of them. 395 */ 396 for_each_context(priv, ctx) { 397 switch (ctx->staging.dev_type) { 398 case RXON_DEV_TYPE_P2P: 399 /* no timing constraints */ 400 continue; 401 case RXON_DEV_TYPE_ESS: 402 default: 403 /* timing constraints if associated */ 404 if (!iwl_is_associated_ctx(ctx)) 405 continue; 406 break; 407 case RXON_DEV_TYPE_CP: 408 case RXON_DEV_TYPE_2STA: 409 /* 410 * These seem to always have timers for TBTT 411 * active in uCode even when not associated yet. 412 */ 413 break; 414 } 415 416 limits[n_active++] = ctx->beacon_int ?: IWL_PASSIVE_DWELL_BASE; 417 } 418 419 switch (n_active) { 420 case 0: 421 return dwell_time; 422 case 2: 423 limit = (limits[1] * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2; 424 limit /= 2; 425 dwell_time = min(limit, dwell_time); 426 /* fall through to limit further */ 427 case 1: 428 limit = (limits[0] * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2; 429 limit /= n_active; 430 return min(limit, dwell_time); 431 default: 432 WARN_ON_ONCE(1); 433 return dwell_time; 434 } 435 } 436 437 static u16 iwl_get_passive_dwell_time(struct iwl_priv *priv, 438 enum nl80211_band band) 439 { 440 u16 passive = (band == NL80211_BAND_2GHZ) ? 441 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 : 442 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52; 443 444 return iwl_limit_dwell(priv, passive); 445 } 446 447 /* Return valid, unused, channel for a passive scan to reset the RF */ 448 static u8 iwl_get_single_channel_number(struct iwl_priv *priv, 449 enum nl80211_band band) 450 { 451 struct ieee80211_supported_band *sband = priv->hw->wiphy->bands[band]; 452 struct iwl_rxon_context *ctx; 453 int i; 454 455 for (i = 0; i < sband->n_channels; i++) { 456 bool busy = false; 457 458 for_each_context(priv, ctx) { 459 busy = sband->channels[i].hw_value == 460 le16_to_cpu(ctx->staging.channel); 461 if (busy) 462 break; 463 } 464 465 if (busy) 466 continue; 467 468 if (!(sband->channels[i].flags & IEEE80211_CHAN_DISABLED)) 469 return sband->channels[i].hw_value; 470 } 471 472 return 0; 473 } 474 475 static int iwl_get_channel_for_reset_scan(struct iwl_priv *priv, 476 struct ieee80211_vif *vif, 477 enum nl80211_band band, 478 struct iwl_scan_channel *scan_ch) 479 { 480 const struct ieee80211_supported_band *sband; 481 u16 channel; 482 483 sband = iwl_get_hw_mode(priv, band); 484 if (!sband) { 485 IWL_ERR(priv, "invalid band\n"); 486 return 0; 487 } 488 489 channel = iwl_get_single_channel_number(priv, band); 490 if (channel) { 491 scan_ch->channel = cpu_to_le16(channel); 492 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE; 493 scan_ch->active_dwell = 494 cpu_to_le16(IWL_RADIO_RESET_DWELL_TIME); 495 scan_ch->passive_dwell = 496 cpu_to_le16(IWL_RADIO_RESET_DWELL_TIME); 497 /* Set txpower levels to defaults */ 498 scan_ch->dsp_atten = 110; 499 if (band == NL80211_BAND_5GHZ) 500 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3; 501 else 502 scan_ch->tx_gain = ((1 << 5) | (5 << 3)); 503 return 1; 504 } 505 506 IWL_ERR(priv, "no valid channel found\n"); 507 return 0; 508 } 509 510 static int iwl_get_channels_for_scan(struct iwl_priv *priv, 511 struct ieee80211_vif *vif, 512 enum nl80211_band band, 513 u8 is_active, u8 n_probes, 514 struct iwl_scan_channel *scan_ch) 515 { 516 struct ieee80211_channel *chan; 517 const struct ieee80211_supported_band *sband; 518 u16 passive_dwell = 0; 519 u16 active_dwell = 0; 520 int added, i; 521 u16 channel; 522 523 sband = iwl_get_hw_mode(priv, band); 524 if (!sband) 525 return 0; 526 527 active_dwell = iwl_get_active_dwell_time(priv, band, n_probes); 528 passive_dwell = iwl_get_passive_dwell_time(priv, band); 529 530 if (passive_dwell <= active_dwell) 531 passive_dwell = active_dwell + 1; 532 533 for (i = 0, added = 0; i < priv->scan_request->n_channels; i++) { 534 chan = priv->scan_request->channels[i]; 535 536 if (chan->band != band) 537 continue; 538 539 channel = chan->hw_value; 540 scan_ch->channel = cpu_to_le16(channel); 541 542 if (!is_active || (chan->flags & IEEE80211_CHAN_NO_IR)) 543 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE; 544 else 545 scan_ch->type = SCAN_CHANNEL_TYPE_ACTIVE; 546 547 if (n_probes) 548 scan_ch->type |= IWL_SCAN_PROBE_MASK(n_probes); 549 550 scan_ch->active_dwell = cpu_to_le16(active_dwell); 551 scan_ch->passive_dwell = cpu_to_le16(passive_dwell); 552 553 /* Set txpower levels to defaults */ 554 scan_ch->dsp_atten = 110; 555 556 /* NOTE: if we were doing 6Mb OFDM for scans we'd use 557 * power level: 558 * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3; 559 */ 560 if (band == NL80211_BAND_5GHZ) 561 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3; 562 else 563 scan_ch->tx_gain = ((1 << 5) | (5 << 3)); 564 565 IWL_DEBUG_SCAN(priv, "Scanning ch=%d prob=0x%X [%s %d]\n", 566 channel, le32_to_cpu(scan_ch->type), 567 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ? 568 "ACTIVE" : "PASSIVE", 569 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ? 570 active_dwell : passive_dwell); 571 572 scan_ch++; 573 added++; 574 } 575 576 IWL_DEBUG_SCAN(priv, "total channels to scan %d\n", added); 577 return added; 578 } 579 580 /** 581 * iwl_fill_probe_req - fill in all required fields and IE for probe request 582 */ 583 584 static u16 iwl_fill_probe_req(struct ieee80211_mgmt *frame, const u8 *ta, 585 const u8 *ies, int ie_len, const u8 *ssid, 586 u8 ssid_len, int left) 587 { 588 int len = 0; 589 u8 *pos = NULL; 590 591 /* Make sure there is enough space for the probe request, 592 * two mandatory IEs and the data */ 593 left -= 24; 594 if (left < 0) 595 return 0; 596 597 frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ); 598 eth_broadcast_addr(frame->da); 599 memcpy(frame->sa, ta, ETH_ALEN); 600 eth_broadcast_addr(frame->bssid); 601 frame->seq_ctrl = 0; 602 603 len += 24; 604 605 /* ...next IE... */ 606 pos = &frame->u.probe_req.variable[0]; 607 608 /* fill in our SSID IE */ 609 left -= ssid_len + 2; 610 if (left < 0) 611 return 0; 612 *pos++ = WLAN_EID_SSID; 613 *pos++ = ssid_len; 614 if (ssid && ssid_len) { 615 memcpy(pos, ssid, ssid_len); 616 pos += ssid_len; 617 } 618 619 len += ssid_len + 2; 620 621 if (WARN_ON(left < ie_len)) 622 return len; 623 624 if (ies && ie_len) { 625 memcpy(pos, ies, ie_len); 626 len += ie_len; 627 } 628 629 return (u16)len; 630 } 631 632 static int iwlagn_request_scan(struct iwl_priv *priv, struct ieee80211_vif *vif) 633 { 634 struct iwl_host_cmd cmd = { 635 .id = REPLY_SCAN_CMD, 636 .len = { sizeof(struct iwl_scan_cmd), }, 637 }; 638 struct iwl_scan_cmd *scan; 639 struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS]; 640 u32 rate_flags = 0; 641 u16 cmd_len = 0; 642 u16 rx_chain = 0; 643 enum nl80211_band band; 644 u8 n_probes = 0; 645 u8 rx_ant = priv->nvm_data->valid_rx_ant; 646 u8 rate; 647 bool is_active = false; 648 int chan_mod; 649 u8 active_chains; 650 u8 scan_tx_antennas = priv->nvm_data->valid_tx_ant; 651 int ret; 652 int scan_cmd_size = sizeof(struct iwl_scan_cmd) + 653 MAX_SCAN_CHANNEL * sizeof(struct iwl_scan_channel) + 654 priv->fw->ucode_capa.max_probe_length; 655 const u8 *ssid = NULL; 656 u8 ssid_len = 0; 657 658 if (WARN_ON(priv->scan_type == IWL_SCAN_NORMAL && 659 (!priv->scan_request || 660 priv->scan_request->n_channels > MAX_SCAN_CHANNEL))) 661 return -EINVAL; 662 663 lockdep_assert_held(&priv->mutex); 664 665 if (vif) 666 ctx = iwl_rxon_ctx_from_vif(vif); 667 668 if (!priv->scan_cmd) { 669 priv->scan_cmd = kmalloc(scan_cmd_size, GFP_KERNEL); 670 if (!priv->scan_cmd) { 671 IWL_DEBUG_SCAN(priv, 672 "fail to allocate memory for scan\n"); 673 return -ENOMEM; 674 } 675 } 676 scan = priv->scan_cmd; 677 memset(scan, 0, scan_cmd_size); 678 679 scan->quiet_plcp_th = IWL_PLCP_QUIET_THRESH; 680 scan->quiet_time = IWL_ACTIVE_QUIET_TIME; 681 682 if (iwl_is_any_associated(priv)) { 683 u16 interval = 0; 684 u32 extra; 685 u32 suspend_time = 100; 686 u32 scan_suspend_time = 100; 687 688 IWL_DEBUG_INFO(priv, "Scanning while associated...\n"); 689 switch (priv->scan_type) { 690 case IWL_SCAN_RADIO_RESET: 691 interval = 0; 692 break; 693 case IWL_SCAN_NORMAL: 694 interval = vif->bss_conf.beacon_int; 695 break; 696 } 697 698 scan->suspend_time = 0; 699 scan->max_out_time = cpu_to_le32(200 * 1024); 700 if (!interval) 701 interval = suspend_time; 702 703 extra = (suspend_time / interval) << 22; 704 scan_suspend_time = (extra | 705 ((suspend_time % interval) * 1024)); 706 scan->suspend_time = cpu_to_le32(scan_suspend_time); 707 IWL_DEBUG_SCAN(priv, "suspend_time 0x%X beacon interval %d\n", 708 scan_suspend_time, interval); 709 } 710 711 switch (priv->scan_type) { 712 case IWL_SCAN_RADIO_RESET: 713 IWL_DEBUG_SCAN(priv, "Start internal passive scan.\n"); 714 /* 715 * Override quiet time as firmware checks that active 716 * dwell is >= quiet; since we use passive scan it'll 717 * not actually be used. 718 */ 719 scan->quiet_time = cpu_to_le16(IWL_RADIO_RESET_DWELL_TIME); 720 break; 721 case IWL_SCAN_NORMAL: 722 if (priv->scan_request->n_ssids) { 723 int i, p = 0; 724 IWL_DEBUG_SCAN(priv, "Kicking off active scan\n"); 725 /* 726 * The highest priority SSID is inserted to the 727 * probe request template. 728 */ 729 ssid_len = priv->scan_request->ssids[0].ssid_len; 730 ssid = priv->scan_request->ssids[0].ssid; 731 732 /* 733 * Invert the order of ssids, the firmware will invert 734 * it back. 735 */ 736 for (i = priv->scan_request->n_ssids - 1; i >= 1; i--) { 737 scan->direct_scan[p].id = WLAN_EID_SSID; 738 scan->direct_scan[p].len = 739 priv->scan_request->ssids[i].ssid_len; 740 memcpy(scan->direct_scan[p].ssid, 741 priv->scan_request->ssids[i].ssid, 742 priv->scan_request->ssids[i].ssid_len); 743 n_probes++; 744 p++; 745 } 746 is_active = true; 747 } else 748 IWL_DEBUG_SCAN(priv, "Start passive scan.\n"); 749 break; 750 } 751 752 scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK; 753 scan->tx_cmd.sta_id = ctx->bcast_sta_id; 754 scan->tx_cmd.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE; 755 756 switch (priv->scan_band) { 757 case NL80211_BAND_2GHZ: 758 scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK; 759 chan_mod = le32_to_cpu( 760 priv->contexts[IWL_RXON_CTX_BSS].active.flags & 761 RXON_FLG_CHANNEL_MODE_MSK) 762 >> RXON_FLG_CHANNEL_MODE_POS; 763 if ((priv->scan_request && priv->scan_request->no_cck) || 764 chan_mod == CHANNEL_MODE_PURE_40) { 765 rate = IWL_RATE_6M_PLCP; 766 } else { 767 rate = IWL_RATE_1M_PLCP; 768 rate_flags = RATE_MCS_CCK_MSK; 769 } 770 /* 771 * Internal scans are passive, so we can indiscriminately set 772 * the BT ignore flag on 2.4 GHz since it applies to TX only. 773 */ 774 if (priv->lib->bt_params && 775 priv->lib->bt_params->advanced_bt_coexist) 776 scan->tx_cmd.tx_flags |= TX_CMD_FLG_IGNORE_BT; 777 break; 778 case NL80211_BAND_5GHZ: 779 rate = IWL_RATE_6M_PLCP; 780 break; 781 default: 782 IWL_WARN(priv, "Invalid scan band\n"); 783 return -EIO; 784 } 785 786 /* 787 * If active scanning is requested but a certain channel is 788 * marked passive, we can do active scanning if we detect 789 * transmissions. 790 * 791 * There is an issue with some firmware versions that triggers 792 * a sysassert on a "good CRC threshold" of zero (== disabled), 793 * on a radar channel even though this means that we should NOT 794 * send probes. 795 * 796 * The "good CRC threshold" is the number of frames that we 797 * need to receive during our dwell time on a channel before 798 * sending out probes -- setting this to a huge value will 799 * mean we never reach it, but at the same time work around 800 * the aforementioned issue. Thus use IWL_GOOD_CRC_TH_NEVER 801 * here instead of IWL_GOOD_CRC_TH_DISABLED. 802 * 803 * This was fixed in later versions along with some other 804 * scan changes, and the threshold behaves as a flag in those 805 * versions. 806 */ 807 if (priv->new_scan_threshold_behaviour) 808 scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH_DEFAULT : 809 IWL_GOOD_CRC_TH_DISABLED; 810 else 811 scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH_DEFAULT : 812 IWL_GOOD_CRC_TH_NEVER; 813 814 band = priv->scan_band; 815 816 if (band == NL80211_BAND_2GHZ && 817 priv->lib->bt_params && 818 priv->lib->bt_params->advanced_bt_coexist) { 819 /* transmit 2.4 GHz probes only on first antenna */ 820 scan_tx_antennas = first_antenna(scan_tx_antennas); 821 } 822 823 priv->scan_tx_ant[band] = iwl_toggle_tx_ant(priv, 824 priv->scan_tx_ant[band], 825 scan_tx_antennas); 826 rate_flags |= iwl_ant_idx_to_flags(priv->scan_tx_ant[band]); 827 scan->tx_cmd.rate_n_flags = iwl_hw_set_rate_n_flags(rate, rate_flags); 828 829 /* 830 * In power save mode while associated use one chain, 831 * otherwise use all chains 832 */ 833 if (test_bit(STATUS_POWER_PMI, &priv->status) && 834 !(priv->hw->conf.flags & IEEE80211_CONF_IDLE)) { 835 /* rx_ant has been set to all valid chains previously */ 836 active_chains = rx_ant & 837 ((u8)(priv->chain_noise_data.active_chains)); 838 if (!active_chains) 839 active_chains = rx_ant; 840 841 IWL_DEBUG_SCAN(priv, "chain_noise_data.active_chains: %u\n", 842 priv->chain_noise_data.active_chains); 843 844 rx_ant = first_antenna(active_chains); 845 } 846 if (priv->lib->bt_params && 847 priv->lib->bt_params->advanced_bt_coexist && 848 priv->bt_full_concurrent) { 849 /* operated as 1x1 in full concurrency mode */ 850 rx_ant = first_antenna(rx_ant); 851 } 852 853 /* MIMO is not used here, but value is required */ 854 rx_chain |= 855 priv->nvm_data->valid_rx_ant << RXON_RX_CHAIN_VALID_POS; 856 rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_MIMO_SEL_POS; 857 rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_SEL_POS; 858 rx_chain |= 0x1 << RXON_RX_CHAIN_DRIVER_FORCE_POS; 859 scan->rx_chain = cpu_to_le16(rx_chain); 860 switch (priv->scan_type) { 861 case IWL_SCAN_NORMAL: 862 cmd_len = iwl_fill_probe_req( 863 (struct ieee80211_mgmt *)scan->data, 864 vif->addr, 865 priv->scan_request->ie, 866 priv->scan_request->ie_len, 867 ssid, ssid_len, 868 scan_cmd_size - sizeof(*scan)); 869 break; 870 case IWL_SCAN_RADIO_RESET: 871 /* use bcast addr, will not be transmitted but must be valid */ 872 cmd_len = iwl_fill_probe_req( 873 (struct ieee80211_mgmt *)scan->data, 874 iwl_bcast_addr, NULL, 0, 875 NULL, 0, 876 scan_cmd_size - sizeof(*scan)); 877 break; 878 default: 879 BUG(); 880 } 881 scan->tx_cmd.len = cpu_to_le16(cmd_len); 882 883 scan->filter_flags |= (RXON_FILTER_ACCEPT_GRP_MSK | 884 RXON_FILTER_BCON_AWARE_MSK); 885 886 switch (priv->scan_type) { 887 case IWL_SCAN_RADIO_RESET: 888 scan->channel_count = 889 iwl_get_channel_for_reset_scan(priv, vif, band, 890 (void *)&scan->data[cmd_len]); 891 break; 892 case IWL_SCAN_NORMAL: 893 scan->channel_count = 894 iwl_get_channels_for_scan(priv, vif, band, 895 is_active, n_probes, 896 (void *)&scan->data[cmd_len]); 897 break; 898 } 899 900 if (scan->channel_count == 0) { 901 IWL_DEBUG_SCAN(priv, "channel count %d\n", scan->channel_count); 902 return -EIO; 903 } 904 905 cmd.len[0] += le16_to_cpu(scan->tx_cmd.len) + 906 scan->channel_count * sizeof(struct iwl_scan_channel); 907 cmd.data[0] = scan; 908 cmd.dataflags[0] = IWL_HCMD_DFL_NOCOPY; 909 scan->len = cpu_to_le16(cmd.len[0]); 910 911 /* set scan bit here for PAN params */ 912 set_bit(STATUS_SCAN_HW, &priv->status); 913 914 ret = iwlagn_set_pan_params(priv); 915 if (ret) { 916 clear_bit(STATUS_SCAN_HW, &priv->status); 917 return ret; 918 } 919 920 ret = iwl_dvm_send_cmd(priv, &cmd); 921 if (ret) { 922 clear_bit(STATUS_SCAN_HW, &priv->status); 923 iwlagn_set_pan_params(priv); 924 } 925 926 return ret; 927 } 928 929 void iwl_init_scan_params(struct iwl_priv *priv) 930 { 931 u8 ant_idx = fls(priv->nvm_data->valid_tx_ant) - 1; 932 if (!priv->scan_tx_ant[NL80211_BAND_5GHZ]) 933 priv->scan_tx_ant[NL80211_BAND_5GHZ] = ant_idx; 934 if (!priv->scan_tx_ant[NL80211_BAND_2GHZ]) 935 priv->scan_tx_ant[NL80211_BAND_2GHZ] = ant_idx; 936 } 937 938 int __must_check iwl_scan_initiate(struct iwl_priv *priv, 939 struct ieee80211_vif *vif, 940 enum iwl_scan_type scan_type, 941 enum nl80211_band band) 942 { 943 int ret; 944 945 lockdep_assert_held(&priv->mutex); 946 947 cancel_delayed_work(&priv->scan_check); 948 949 if (!iwl_is_ready_rf(priv)) { 950 IWL_WARN(priv, "Request scan called when driver not ready.\n"); 951 return -EIO; 952 } 953 954 if (test_bit(STATUS_SCAN_HW, &priv->status)) { 955 IWL_DEBUG_SCAN(priv, 956 "Multiple concurrent scan requests in parallel.\n"); 957 return -EBUSY; 958 } 959 960 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) { 961 IWL_DEBUG_SCAN(priv, "Scan request while abort pending.\n"); 962 return -EBUSY; 963 } 964 965 IWL_DEBUG_SCAN(priv, "Starting %sscan...\n", 966 scan_type == IWL_SCAN_NORMAL ? "" : 967 "internal short "); 968 969 set_bit(STATUS_SCANNING, &priv->status); 970 priv->scan_type = scan_type; 971 priv->scan_start = jiffies; 972 priv->scan_band = band; 973 974 ret = iwlagn_request_scan(priv, vif); 975 if (ret) { 976 clear_bit(STATUS_SCANNING, &priv->status); 977 priv->scan_type = IWL_SCAN_NORMAL; 978 return ret; 979 } 980 981 queue_delayed_work(priv->workqueue, &priv->scan_check, 982 IWL_SCAN_CHECK_WATCHDOG); 983 984 return 0; 985 } 986 987 988 /* 989 * internal short scan, this function should only been called while associated. 990 * It will reset and tune the radio to prevent possible RF related problem 991 */ 992 void iwl_internal_short_hw_scan(struct iwl_priv *priv) 993 { 994 queue_work(priv->workqueue, &priv->start_internal_scan); 995 } 996 997 static void iwl_bg_start_internal_scan(struct work_struct *work) 998 { 999 struct iwl_priv *priv = 1000 container_of(work, struct iwl_priv, start_internal_scan); 1001 1002 IWL_DEBUG_SCAN(priv, "Start internal scan\n"); 1003 1004 mutex_lock(&priv->mutex); 1005 1006 if (priv->scan_type == IWL_SCAN_RADIO_RESET) { 1007 IWL_DEBUG_SCAN(priv, "Internal scan already in progress\n"); 1008 goto unlock; 1009 } 1010 1011 if (test_bit(STATUS_SCANNING, &priv->status)) { 1012 IWL_DEBUG_SCAN(priv, "Scan already in progress.\n"); 1013 goto unlock; 1014 } 1015 1016 if (iwl_scan_initiate(priv, NULL, IWL_SCAN_RADIO_RESET, priv->band)) 1017 IWL_DEBUG_SCAN(priv, "failed to start internal short scan\n"); 1018 unlock: 1019 mutex_unlock(&priv->mutex); 1020 } 1021 1022 static void iwl_bg_scan_check(struct work_struct *data) 1023 { 1024 struct iwl_priv *priv = 1025 container_of(data, struct iwl_priv, scan_check.work); 1026 1027 IWL_DEBUG_SCAN(priv, "Scan check work\n"); 1028 1029 /* Since we are here firmware does not finish scan and 1030 * most likely is in bad shape, so we don't bother to 1031 * send abort command, just force scan complete to mac80211 */ 1032 mutex_lock(&priv->mutex); 1033 iwl_force_scan_end(priv); 1034 mutex_unlock(&priv->mutex); 1035 } 1036 1037 static void iwl_bg_abort_scan(struct work_struct *work) 1038 { 1039 struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan); 1040 1041 IWL_DEBUG_SCAN(priv, "Abort scan work\n"); 1042 1043 /* We keep scan_check work queued in case when firmware will not 1044 * report back scan completed notification */ 1045 mutex_lock(&priv->mutex); 1046 iwl_scan_cancel_timeout(priv, 200); 1047 mutex_unlock(&priv->mutex); 1048 } 1049 1050 static void iwl_bg_scan_completed(struct work_struct *work) 1051 { 1052 struct iwl_priv *priv = 1053 container_of(work, struct iwl_priv, scan_completed); 1054 1055 mutex_lock(&priv->mutex); 1056 iwl_process_scan_complete(priv); 1057 mutex_unlock(&priv->mutex); 1058 } 1059 1060 void iwl_setup_scan_deferred_work(struct iwl_priv *priv) 1061 { 1062 INIT_WORK(&priv->scan_completed, iwl_bg_scan_completed); 1063 INIT_WORK(&priv->abort_scan, iwl_bg_abort_scan); 1064 INIT_WORK(&priv->start_internal_scan, iwl_bg_start_internal_scan); 1065 INIT_DELAYED_WORK(&priv->scan_check, iwl_bg_scan_check); 1066 } 1067 1068 void iwl_cancel_scan_deferred_work(struct iwl_priv *priv) 1069 { 1070 cancel_work_sync(&priv->start_internal_scan); 1071 cancel_work_sync(&priv->abort_scan); 1072 cancel_work_sync(&priv->scan_completed); 1073 1074 if (cancel_delayed_work_sync(&priv->scan_check)) { 1075 mutex_lock(&priv->mutex); 1076 iwl_force_scan_end(priv); 1077 mutex_unlock(&priv->mutex); 1078 } 1079 } 1080