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 <ilw@linux.intel.com> 26 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 27 *****************************************************************************/ 28#include <linux/slab.h> 29#include <linux/types.h> 30#include <linux/etherdevice.h> 31#include <net/mac80211.h> 32 33#include "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 57static int iwl_send_scan_abort(struct iwl_priv *priv) 58{ 59 int ret; 60 struct iwl_host_cmd cmd = { 61 .id = REPLY_SCAN_ABORT_CMD, 62 .flags = CMD_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 95static void iwl_complete_scan(struct iwl_priv *priv, bool aborted) 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, aborted); 101 } 102 103 priv->scan_type = IWL_SCAN_NORMAL; 104 priv->scan_vif = NULL; 105 priv->scan_request = NULL; 106} 107 108static 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 150out_complete: 151 iwl_complete_scan(priv, aborted); 152 153out_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 161void 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 178static 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 */ 205int 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 */ 217void 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) */ 250static int iwl_rx_reply_scan(struct iwl_priv *priv, 251 struct iwl_rx_cmd_buffer *rxb, 252 struct iwl_device_cmd *cmd) 253{ 254#ifdef CONFIG_IWLWIFI_DEBUG 255 struct iwl_rx_packet *pkt = rxb_addr(rxb); 256 struct iwl_scanreq_notification *notif = (void *)pkt->data; 257 258 IWL_DEBUG_SCAN(priv, "Scan request status = 0x%x\n", notif->status); 259#endif 260 return 0; 261} 262 263/* Service SCAN_START_NOTIFICATION (0x82) */ 264static int iwl_rx_scan_start_notif(struct iwl_priv *priv, 265 struct iwl_rx_cmd_buffer *rxb, 266 struct iwl_device_cmd *cmd) 267{ 268 struct iwl_rx_packet *pkt = rxb_addr(rxb); 269 struct iwl_scanstart_notification *notif = (void *)pkt->data; 270 271 priv->scan_start_tsf = le32_to_cpu(notif->tsf_low); 272 IWL_DEBUG_SCAN(priv, "Scan start: " 273 "%d [802.11%s] " 274 "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n", 275 notif->channel, 276 notif->band ? "bg" : "a", 277 le32_to_cpu(notif->tsf_high), 278 le32_to_cpu(notif->tsf_low), 279 notif->status, notif->beacon_timer); 280 281 return 0; 282} 283 284/* Service SCAN_RESULTS_NOTIFICATION (0x83) */ 285static int iwl_rx_scan_results_notif(struct iwl_priv *priv, 286 struct iwl_rx_cmd_buffer *rxb, 287 struct iwl_device_cmd *cmd) 288{ 289#ifdef CONFIG_IWLWIFI_DEBUG 290 struct iwl_rx_packet *pkt = rxb_addr(rxb); 291 struct iwl_scanresults_notification *notif = (void *)pkt->data; 292 293 IWL_DEBUG_SCAN(priv, "Scan ch.res: " 294 "%d [802.11%s] " 295 "probe status: %u:%u " 296 "(TSF: 0x%08X:%08X) - %d " 297 "elapsed=%lu usec\n", 298 notif->channel, 299 notif->band ? "bg" : "a", 300 notif->probe_status, notif->num_probe_not_sent, 301 le32_to_cpu(notif->tsf_high), 302 le32_to_cpu(notif->tsf_low), 303 le32_to_cpu(notif->statistics[0]), 304 le32_to_cpu(notif->tsf_low) - priv->scan_start_tsf); 305#endif 306 return 0; 307} 308 309/* Service SCAN_COMPLETE_NOTIFICATION (0x84) */ 310static int iwl_rx_scan_complete_notif(struct iwl_priv *priv, 311 struct iwl_rx_cmd_buffer *rxb, 312 struct iwl_device_cmd *cmd) 313{ 314 struct iwl_rx_packet *pkt = rxb_addr(rxb); 315 struct iwl_scancomplete_notification *scan_notif = (void *)pkt->data; 316 317 IWL_DEBUG_SCAN(priv, "Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n", 318 scan_notif->scanned_channels, 319 scan_notif->tsf_low, 320 scan_notif->tsf_high, scan_notif->status); 321 322 IWL_DEBUG_SCAN(priv, "Scan on %sGHz took %dms\n", 323 (priv->scan_band == IEEE80211_BAND_2GHZ) ? "2.4" : "5.2", 324 jiffies_to_msecs(jiffies - priv->scan_start)); 325 326 /* 327 * When aborting, we run the scan completed background work inline 328 * and the background work must then do nothing. The SCAN_COMPLETE 329 * bit helps implement that logic and thus needs to be set before 330 * queueing the work. Also, since the scan abort waits for SCAN_HW 331 * to clear, we need to set SCAN_COMPLETE before clearing SCAN_HW 332 * to avoid a race there. 333 */ 334 set_bit(STATUS_SCAN_COMPLETE, &priv->status); 335 clear_bit(STATUS_SCAN_HW, &priv->status); 336 queue_work(priv->workqueue, &priv->scan_completed); 337 338 if (priv->iw_mode != NL80211_IFTYPE_ADHOC && 339 iwl_advanced_bt_coexist(priv) && 340 priv->bt_status != scan_notif->bt_status) { 341 if (scan_notif->bt_status) { 342 /* BT on */ 343 if (!priv->bt_ch_announce) 344 priv->bt_traffic_load = 345 IWL_BT_COEX_TRAFFIC_LOAD_HIGH; 346 /* 347 * otherwise, no traffic load information provided 348 * no changes made 349 */ 350 } else { 351 /* BT off */ 352 priv->bt_traffic_load = 353 IWL_BT_COEX_TRAFFIC_LOAD_NONE; 354 } 355 priv->bt_status = scan_notif->bt_status; 356 queue_work(priv->workqueue, 357 &priv->bt_traffic_change_work); 358 } 359 return 0; 360} 361 362void iwl_setup_rx_scan_handlers(struct iwl_priv *priv) 363{ 364 /* scan handlers */ 365 priv->rx_handlers[REPLY_SCAN_CMD] = iwl_rx_reply_scan; 366 priv->rx_handlers[SCAN_START_NOTIFICATION] = iwl_rx_scan_start_notif; 367 priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] = 368 iwl_rx_scan_results_notif; 369 priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] = 370 iwl_rx_scan_complete_notif; 371} 372 373static u16 iwl_get_active_dwell_time(struct iwl_priv *priv, 374 enum ieee80211_band band, u8 n_probes) 375{ 376 if (band == IEEE80211_BAND_5GHZ) 377 return IWL_ACTIVE_DWELL_TIME_52 + 378 IWL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1); 379 else 380 return IWL_ACTIVE_DWELL_TIME_24 + 381 IWL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1); 382} 383 384static u16 iwl_limit_dwell(struct iwl_priv *priv, u16 dwell_time) 385{ 386 struct iwl_rxon_context *ctx; 387 int limits[NUM_IWL_RXON_CTX] = {}; 388 int n_active = 0; 389 u16 limit; 390 391 BUILD_BUG_ON(NUM_IWL_RXON_CTX != 2); 392 393 /* 394 * If we're associated, we clamp the dwell time 98% 395 * of the beacon interval (minus 2 * channel tune time) 396 * If both contexts are active, we have to restrict to 397 * 1/2 of the minimum of them, because they might be in 398 * lock-step with the time inbetween only half of what 399 * time we'd have in each of them. 400 */ 401 for_each_context(priv, ctx) { 402 switch (ctx->staging.dev_type) { 403 case RXON_DEV_TYPE_P2P: 404 /* no timing constraints */ 405 continue; 406 case RXON_DEV_TYPE_ESS: 407 default: 408 /* timing constraints if associated */ 409 if (!iwl_is_associated_ctx(ctx)) 410 continue; 411 break; 412 case RXON_DEV_TYPE_CP: 413 case RXON_DEV_TYPE_2STA: 414 /* 415 * These seem to always have timers for TBTT 416 * active in uCode even when not associated yet. 417 */ 418 break; 419 } 420 421 limits[n_active++] = ctx->beacon_int ?: IWL_PASSIVE_DWELL_BASE; 422 } 423 424 switch (n_active) { 425 case 0: 426 return dwell_time; 427 case 2: 428 limit = (limits[1] * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2; 429 limit /= 2; 430 dwell_time = min(limit, dwell_time); 431 /* fall through to limit further */ 432 case 1: 433 limit = (limits[0] * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2; 434 limit /= n_active; 435 return min(limit, dwell_time); 436 default: 437 WARN_ON_ONCE(1); 438 return dwell_time; 439 } 440} 441 442static u16 iwl_get_passive_dwell_time(struct iwl_priv *priv, 443 enum ieee80211_band band) 444{ 445 u16 passive = (band == IEEE80211_BAND_2GHZ) ? 446 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 : 447 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52; 448 449 return iwl_limit_dwell(priv, passive); 450} 451 452/* Return valid, unused, channel for a passive scan to reset the RF */ 453static u8 iwl_get_single_channel_number(struct iwl_priv *priv, 454 enum ieee80211_band band) 455{ 456 struct ieee80211_supported_band *sband = priv->hw->wiphy->bands[band]; 457 struct iwl_rxon_context *ctx; 458 int i; 459 460 for (i = 0; i < sband->n_channels; i++) { 461 bool busy = false; 462 463 for_each_context(priv, ctx) { 464 busy = sband->channels[i].hw_value == 465 le16_to_cpu(ctx->staging.channel); 466 if (busy) 467 break; 468 } 469 470 if (busy) 471 continue; 472 473 if (!(sband->channels[i].flags & IEEE80211_CHAN_DISABLED)) 474 return sband->channels[i].hw_value; 475 } 476 477 return 0; 478} 479 480static int iwl_get_channel_for_reset_scan(struct iwl_priv *priv, 481 struct ieee80211_vif *vif, 482 enum ieee80211_band band, 483 struct iwl_scan_channel *scan_ch) 484{ 485 const struct ieee80211_supported_band *sband; 486 u16 channel; 487 488 sband = iwl_get_hw_mode(priv, band); 489 if (!sband) { 490 IWL_ERR(priv, "invalid band\n"); 491 return 0; 492 } 493 494 channel = iwl_get_single_channel_number(priv, band); 495 if (channel) { 496 scan_ch->channel = cpu_to_le16(channel); 497 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE; 498 scan_ch->active_dwell = 499 cpu_to_le16(IWL_RADIO_RESET_DWELL_TIME); 500 scan_ch->passive_dwell = 501 cpu_to_le16(IWL_RADIO_RESET_DWELL_TIME); 502 /* Set txpower levels to defaults */ 503 scan_ch->dsp_atten = 110; 504 if (band == IEEE80211_BAND_5GHZ) 505 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3; 506 else 507 scan_ch->tx_gain = ((1 << 5) | (5 << 3)); 508 return 1; 509 } 510 511 IWL_ERR(priv, "no valid channel found\n"); 512 return 0; 513} 514 515static int iwl_get_channels_for_scan(struct iwl_priv *priv, 516 struct ieee80211_vif *vif, 517 enum ieee80211_band band, 518 u8 is_active, u8 n_probes, 519 struct iwl_scan_channel *scan_ch) 520{ 521 struct ieee80211_channel *chan; 522 const struct ieee80211_supported_band *sband; 523 u16 passive_dwell = 0; 524 u16 active_dwell = 0; 525 int added, i; 526 u16 channel; 527 528 sband = iwl_get_hw_mode(priv, band); 529 if (!sband) 530 return 0; 531 532 active_dwell = iwl_get_active_dwell_time(priv, band, n_probes); 533 passive_dwell = iwl_get_passive_dwell_time(priv, band); 534 535 if (passive_dwell <= active_dwell) 536 passive_dwell = active_dwell + 1; 537 538 for (i = 0, added = 0; i < priv->scan_request->n_channels; i++) { 539 chan = priv->scan_request->channels[i]; 540 541 if (chan->band != band) 542 continue; 543 544 channel = chan->hw_value; 545 scan_ch->channel = cpu_to_le16(channel); 546 547 if (!is_active || (chan->flags & IEEE80211_CHAN_NO_IR)) 548 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE; 549 else 550 scan_ch->type = SCAN_CHANNEL_TYPE_ACTIVE; 551 552 if (n_probes) 553 scan_ch->type |= IWL_SCAN_PROBE_MASK(n_probes); 554 555 scan_ch->active_dwell = cpu_to_le16(active_dwell); 556 scan_ch->passive_dwell = cpu_to_le16(passive_dwell); 557 558 /* Set txpower levels to defaults */ 559 scan_ch->dsp_atten = 110; 560 561 /* NOTE: if we were doing 6Mb OFDM for scans we'd use 562 * power level: 563 * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3; 564 */ 565 if (band == IEEE80211_BAND_5GHZ) 566 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3; 567 else 568 scan_ch->tx_gain = ((1 << 5) | (5 << 3)); 569 570 IWL_DEBUG_SCAN(priv, "Scanning ch=%d prob=0x%X [%s %d]\n", 571 channel, le32_to_cpu(scan_ch->type), 572 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ? 573 "ACTIVE" : "PASSIVE", 574 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ? 575 active_dwell : passive_dwell); 576 577 scan_ch++; 578 added++; 579 } 580 581 IWL_DEBUG_SCAN(priv, "total channels to scan %d\n", added); 582 return added; 583} 584 585/** 586 * iwl_fill_probe_req - fill in all required fields and IE for probe request 587 */ 588 589static u16 iwl_fill_probe_req(struct ieee80211_mgmt *frame, const u8 *ta, 590 const u8 *ies, int ie_len, const u8 *ssid, 591 u8 ssid_len, int left) 592{ 593 int len = 0; 594 u8 *pos = NULL; 595 596 /* Make sure there is enough space for the probe request, 597 * two mandatory IEs and the data */ 598 left -= 24; 599 if (left < 0) 600 return 0; 601 602 frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ); 603 eth_broadcast_addr(frame->da); 604 memcpy(frame->sa, ta, ETH_ALEN); 605 eth_broadcast_addr(frame->bssid); 606 frame->seq_ctrl = 0; 607 608 len += 24; 609 610 /* ...next IE... */ 611 pos = &frame->u.probe_req.variable[0]; 612 613 /* fill in our SSID IE */ 614 left -= ssid_len + 2; 615 if (left < 0) 616 return 0; 617 *pos++ = WLAN_EID_SSID; 618 *pos++ = ssid_len; 619 if (ssid && ssid_len) { 620 memcpy(pos, ssid, ssid_len); 621 pos += ssid_len; 622 } 623 624 len += ssid_len + 2; 625 626 if (WARN_ON(left < ie_len)) 627 return len; 628 629 if (ies && ie_len) { 630 memcpy(pos, ies, ie_len); 631 len += ie_len; 632 } 633 634 return (u16)len; 635} 636 637static int iwlagn_request_scan(struct iwl_priv *priv, struct ieee80211_vif *vif) 638{ 639 struct iwl_host_cmd cmd = { 640 .id = REPLY_SCAN_CMD, 641 .len = { sizeof(struct iwl_scan_cmd), }, 642 }; 643 struct iwl_scan_cmd *scan; 644 struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS]; 645 u32 rate_flags = 0; 646 u16 cmd_len = 0; 647 u16 rx_chain = 0; 648 enum ieee80211_band band; 649 u8 n_probes = 0; 650 u8 rx_ant = priv->nvm_data->valid_rx_ant; 651 u8 rate; 652 bool is_active = false; 653 int chan_mod; 654 u8 active_chains; 655 u8 scan_tx_antennas = priv->nvm_data->valid_tx_ant; 656 int ret; 657 int scan_cmd_size = sizeof(struct iwl_scan_cmd) + 658 MAX_SCAN_CHANNEL * sizeof(struct iwl_scan_channel) + 659 priv->fw->ucode_capa.max_probe_length; 660 const u8 *ssid = NULL; 661 u8 ssid_len = 0; 662 663 if (WARN_ON(priv->scan_type == IWL_SCAN_NORMAL && 664 (!priv->scan_request || 665 priv->scan_request->n_channels > MAX_SCAN_CHANNEL))) 666 return -EINVAL; 667 668 lockdep_assert_held(&priv->mutex); 669 670 if (vif) 671 ctx = iwl_rxon_ctx_from_vif(vif); 672 673 if (!priv->scan_cmd) { 674 priv->scan_cmd = kmalloc(scan_cmd_size, GFP_KERNEL); 675 if (!priv->scan_cmd) { 676 IWL_DEBUG_SCAN(priv, 677 "fail to allocate memory for scan\n"); 678 return -ENOMEM; 679 } 680 } 681 scan = priv->scan_cmd; 682 memset(scan, 0, scan_cmd_size); 683 684 scan->quiet_plcp_th = IWL_PLCP_QUIET_THRESH; 685 scan->quiet_time = IWL_ACTIVE_QUIET_TIME; 686 687 if (iwl_is_any_associated(priv)) { 688 u16 interval = 0; 689 u32 extra; 690 u32 suspend_time = 100; 691 u32 scan_suspend_time = 100; 692 693 IWL_DEBUG_INFO(priv, "Scanning while associated...\n"); 694 switch (priv->scan_type) { 695 case IWL_SCAN_RADIO_RESET: 696 interval = 0; 697 break; 698 case IWL_SCAN_NORMAL: 699 interval = vif->bss_conf.beacon_int; 700 break; 701 } 702 703 scan->suspend_time = 0; 704 scan->max_out_time = cpu_to_le32(200 * 1024); 705 if (!interval) 706 interval = suspend_time; 707 708 extra = (suspend_time / interval) << 22; 709 scan_suspend_time = (extra | 710 ((suspend_time % interval) * 1024)); 711 scan->suspend_time = cpu_to_le32(scan_suspend_time); 712 IWL_DEBUG_SCAN(priv, "suspend_time 0x%X beacon interval %d\n", 713 scan_suspend_time, interval); 714 } 715 716 switch (priv->scan_type) { 717 case IWL_SCAN_RADIO_RESET: 718 IWL_DEBUG_SCAN(priv, "Start internal passive scan.\n"); 719 /* 720 * Override quiet time as firmware checks that active 721 * dwell is >= quiet; since we use passive scan it'll 722 * not actually be used. 723 */ 724 scan->quiet_time = cpu_to_le16(IWL_RADIO_RESET_DWELL_TIME); 725 break; 726 case IWL_SCAN_NORMAL: 727 if (priv->scan_request->n_ssids) { 728 int i, p = 0; 729 IWL_DEBUG_SCAN(priv, "Kicking off active scan\n"); 730 /* 731 * The highest priority SSID is inserted to the 732 * probe request template. 733 */ 734 ssid_len = priv->scan_request->ssids[0].ssid_len; 735 ssid = priv->scan_request->ssids[0].ssid; 736 737 /* 738 * Invert the order of ssids, the firmware will invert 739 * it back. 740 */ 741 for (i = priv->scan_request->n_ssids - 1; i >= 1; i--) { 742 scan->direct_scan[p].id = WLAN_EID_SSID; 743 scan->direct_scan[p].len = 744 priv->scan_request->ssids[i].ssid_len; 745 memcpy(scan->direct_scan[p].ssid, 746 priv->scan_request->ssids[i].ssid, 747 priv->scan_request->ssids[i].ssid_len); 748 n_probes++; 749 p++; 750 } 751 is_active = true; 752 } else 753 IWL_DEBUG_SCAN(priv, "Start passive scan.\n"); 754 break; 755 } 756 757 scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK; 758 scan->tx_cmd.sta_id = ctx->bcast_sta_id; 759 scan->tx_cmd.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE; 760 761 switch (priv->scan_band) { 762 case IEEE80211_BAND_2GHZ: 763 scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK; 764 chan_mod = le32_to_cpu( 765 priv->contexts[IWL_RXON_CTX_BSS].active.flags & 766 RXON_FLG_CHANNEL_MODE_MSK) 767 >> RXON_FLG_CHANNEL_MODE_POS; 768 if ((priv->scan_request && priv->scan_request->no_cck) || 769 chan_mod == CHANNEL_MODE_PURE_40) { 770 rate = IWL_RATE_6M_PLCP; 771 } else { 772 rate = IWL_RATE_1M_PLCP; 773 rate_flags = RATE_MCS_CCK_MSK; 774 } 775 /* 776 * Internal scans are passive, so we can indiscriminately set 777 * the BT ignore flag on 2.4 GHz since it applies to TX only. 778 */ 779 if (priv->lib->bt_params && 780 priv->lib->bt_params->advanced_bt_coexist) 781 scan->tx_cmd.tx_flags |= TX_CMD_FLG_IGNORE_BT; 782 break; 783 case IEEE80211_BAND_5GHZ: 784 rate = IWL_RATE_6M_PLCP; 785 break; 786 default: 787 IWL_WARN(priv, "Invalid scan band\n"); 788 return -EIO; 789 } 790 791 /* 792 * If active scanning is requested but a certain channel is 793 * marked passive, we can do active scanning if we detect 794 * transmissions. 795 * 796 * There is an issue with some firmware versions that triggers 797 * a sysassert on a "good CRC threshold" of zero (== disabled), 798 * on a radar channel even though this means that we should NOT 799 * send probes. 800 * 801 * The "good CRC threshold" is the number of frames that we 802 * need to receive during our dwell time on a channel before 803 * sending out probes -- setting this to a huge value will 804 * mean we never reach it, but at the same time work around 805 * the aforementioned issue. Thus use IWL_GOOD_CRC_TH_NEVER 806 * here instead of IWL_GOOD_CRC_TH_DISABLED. 807 * 808 * This was fixed in later versions along with some other 809 * scan changes, and the threshold behaves as a flag in those 810 * versions. 811 */ 812 if (priv->new_scan_threshold_behaviour) 813 scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH_DEFAULT : 814 IWL_GOOD_CRC_TH_DISABLED; 815 else 816 scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH_DEFAULT : 817 IWL_GOOD_CRC_TH_NEVER; 818 819 band = priv->scan_band; 820 821 if (band == IEEE80211_BAND_2GHZ && 822 priv->lib->bt_params && 823 priv->lib->bt_params->advanced_bt_coexist) { 824 /* transmit 2.4 GHz probes only on first antenna */ 825 scan_tx_antennas = first_antenna(scan_tx_antennas); 826 } 827 828 priv->scan_tx_ant[band] = iwl_toggle_tx_ant(priv, 829 priv->scan_tx_ant[band], 830 scan_tx_antennas); 831 rate_flags |= iwl_ant_idx_to_flags(priv->scan_tx_ant[band]); 832 scan->tx_cmd.rate_n_flags = iwl_hw_set_rate_n_flags(rate, rate_flags); 833 834 /* 835 * In power save mode while associated use one chain, 836 * otherwise use all chains 837 */ 838 if (test_bit(STATUS_POWER_PMI, &priv->status) && 839 !(priv->hw->conf.flags & IEEE80211_CONF_IDLE)) { 840 /* rx_ant has been set to all valid chains previously */ 841 active_chains = rx_ant & 842 ((u8)(priv->chain_noise_data.active_chains)); 843 if (!active_chains) 844 active_chains = rx_ant; 845 846 IWL_DEBUG_SCAN(priv, "chain_noise_data.active_chains: %u\n", 847 priv->chain_noise_data.active_chains); 848 849 rx_ant = first_antenna(active_chains); 850 } 851 if (priv->lib->bt_params && 852 priv->lib->bt_params->advanced_bt_coexist && 853 priv->bt_full_concurrent) { 854 /* operated as 1x1 in full concurrency mode */ 855 rx_ant = first_antenna(rx_ant); 856 } 857 858 /* MIMO is not used here, but value is required */ 859 rx_chain |= 860 priv->nvm_data->valid_rx_ant << RXON_RX_CHAIN_VALID_POS; 861 rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_MIMO_SEL_POS; 862 rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_SEL_POS; 863 rx_chain |= 0x1 << RXON_RX_CHAIN_DRIVER_FORCE_POS; 864 scan->rx_chain = cpu_to_le16(rx_chain); 865 switch (priv->scan_type) { 866 case IWL_SCAN_NORMAL: 867 cmd_len = iwl_fill_probe_req( 868 (struct ieee80211_mgmt *)scan->data, 869 vif->addr, 870 priv->scan_request->ie, 871 priv->scan_request->ie_len, 872 ssid, ssid_len, 873 scan_cmd_size - sizeof(*scan)); 874 break; 875 case IWL_SCAN_RADIO_RESET: 876 /* use bcast addr, will not be transmitted but must be valid */ 877 cmd_len = iwl_fill_probe_req( 878 (struct ieee80211_mgmt *)scan->data, 879 iwl_bcast_addr, NULL, 0, 880 NULL, 0, 881 scan_cmd_size - sizeof(*scan)); 882 break; 883 default: 884 BUG(); 885 } 886 scan->tx_cmd.len = cpu_to_le16(cmd_len); 887 888 scan->filter_flags |= (RXON_FILTER_ACCEPT_GRP_MSK | 889 RXON_FILTER_BCON_AWARE_MSK); 890 891 switch (priv->scan_type) { 892 case IWL_SCAN_RADIO_RESET: 893 scan->channel_count = 894 iwl_get_channel_for_reset_scan(priv, vif, band, 895 (void *)&scan->data[cmd_len]); 896 break; 897 case IWL_SCAN_NORMAL: 898 scan->channel_count = 899 iwl_get_channels_for_scan(priv, vif, band, 900 is_active, n_probes, 901 (void *)&scan->data[cmd_len]); 902 break; 903 } 904 905 if (scan->channel_count == 0) { 906 IWL_DEBUG_SCAN(priv, "channel count %d\n", scan->channel_count); 907 return -EIO; 908 } 909 910 cmd.len[0] += le16_to_cpu(scan->tx_cmd.len) + 911 scan->channel_count * sizeof(struct iwl_scan_channel); 912 cmd.data[0] = scan; 913 cmd.dataflags[0] = IWL_HCMD_DFL_NOCOPY; 914 scan->len = cpu_to_le16(cmd.len[0]); 915 916 /* set scan bit here for PAN params */ 917 set_bit(STATUS_SCAN_HW, &priv->status); 918 919 ret = iwlagn_set_pan_params(priv); 920 if (ret) { 921 clear_bit(STATUS_SCAN_HW, &priv->status); 922 return ret; 923 } 924 925 ret = iwl_dvm_send_cmd(priv, &cmd); 926 if (ret) { 927 clear_bit(STATUS_SCAN_HW, &priv->status); 928 iwlagn_set_pan_params(priv); 929 } 930 931 return ret; 932} 933 934void iwl_init_scan_params(struct iwl_priv *priv) 935{ 936 u8 ant_idx = fls(priv->nvm_data->valid_tx_ant) - 1; 937 if (!priv->scan_tx_ant[IEEE80211_BAND_5GHZ]) 938 priv->scan_tx_ant[IEEE80211_BAND_5GHZ] = ant_idx; 939 if (!priv->scan_tx_ant[IEEE80211_BAND_2GHZ]) 940 priv->scan_tx_ant[IEEE80211_BAND_2GHZ] = ant_idx; 941} 942 943int __must_check iwl_scan_initiate(struct iwl_priv *priv, 944 struct ieee80211_vif *vif, 945 enum iwl_scan_type scan_type, 946 enum ieee80211_band band) 947{ 948 int ret; 949 950 lockdep_assert_held(&priv->mutex); 951 952 cancel_delayed_work(&priv->scan_check); 953 954 if (!iwl_is_ready_rf(priv)) { 955 IWL_WARN(priv, "Request scan called when driver not ready.\n"); 956 return -EIO; 957 } 958 959 if (test_bit(STATUS_SCAN_HW, &priv->status)) { 960 IWL_DEBUG_SCAN(priv, 961 "Multiple concurrent scan requests in parallel.\n"); 962 return -EBUSY; 963 } 964 965 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) { 966 IWL_DEBUG_SCAN(priv, "Scan request while abort pending.\n"); 967 return -EBUSY; 968 } 969 970 IWL_DEBUG_SCAN(priv, "Starting %sscan...\n", 971 scan_type == IWL_SCAN_NORMAL ? "" : 972 "internal short "); 973 974 set_bit(STATUS_SCANNING, &priv->status); 975 priv->scan_type = scan_type; 976 priv->scan_start = jiffies; 977 priv->scan_band = band; 978 979 ret = iwlagn_request_scan(priv, vif); 980 if (ret) { 981 clear_bit(STATUS_SCANNING, &priv->status); 982 priv->scan_type = IWL_SCAN_NORMAL; 983 return ret; 984 } 985 986 queue_delayed_work(priv->workqueue, &priv->scan_check, 987 IWL_SCAN_CHECK_WATCHDOG); 988 989 return 0; 990} 991 992 993/* 994 * internal short scan, this function should only been called while associated. 995 * It will reset and tune the radio to prevent possible RF related problem 996 */ 997void iwl_internal_short_hw_scan(struct iwl_priv *priv) 998{ 999 queue_work(priv->workqueue, &priv->start_internal_scan); 1000} 1001 1002static void iwl_bg_start_internal_scan(struct work_struct *work) 1003{ 1004 struct iwl_priv *priv = 1005 container_of(work, struct iwl_priv, start_internal_scan); 1006 1007 IWL_DEBUG_SCAN(priv, "Start internal scan\n"); 1008 1009 mutex_lock(&priv->mutex); 1010 1011 if (priv->scan_type == IWL_SCAN_RADIO_RESET) { 1012 IWL_DEBUG_SCAN(priv, "Internal scan already in progress\n"); 1013 goto unlock; 1014 } 1015 1016 if (test_bit(STATUS_SCANNING, &priv->status)) { 1017 IWL_DEBUG_SCAN(priv, "Scan already in progress.\n"); 1018 goto unlock; 1019 } 1020 1021 if (iwl_scan_initiate(priv, NULL, IWL_SCAN_RADIO_RESET, priv->band)) 1022 IWL_DEBUG_SCAN(priv, "failed to start internal short scan\n"); 1023 unlock: 1024 mutex_unlock(&priv->mutex); 1025} 1026 1027static void iwl_bg_scan_check(struct work_struct *data) 1028{ 1029 struct iwl_priv *priv = 1030 container_of(data, struct iwl_priv, scan_check.work); 1031 1032 IWL_DEBUG_SCAN(priv, "Scan check work\n"); 1033 1034 /* Since we are here firmware does not finish scan and 1035 * most likely is in bad shape, so we don't bother to 1036 * send abort command, just force scan complete to mac80211 */ 1037 mutex_lock(&priv->mutex); 1038 iwl_force_scan_end(priv); 1039 mutex_unlock(&priv->mutex); 1040} 1041 1042static void iwl_bg_abort_scan(struct work_struct *work) 1043{ 1044 struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan); 1045 1046 IWL_DEBUG_SCAN(priv, "Abort scan work\n"); 1047 1048 /* We keep scan_check work queued in case when firmware will not 1049 * report back scan completed notification */ 1050 mutex_lock(&priv->mutex); 1051 iwl_scan_cancel_timeout(priv, 200); 1052 mutex_unlock(&priv->mutex); 1053} 1054 1055static void iwl_bg_scan_completed(struct work_struct *work) 1056{ 1057 struct iwl_priv *priv = 1058 container_of(work, struct iwl_priv, scan_completed); 1059 1060 mutex_lock(&priv->mutex); 1061 iwl_process_scan_complete(priv); 1062 mutex_unlock(&priv->mutex); 1063} 1064 1065void iwl_setup_scan_deferred_work(struct iwl_priv *priv) 1066{ 1067 INIT_WORK(&priv->scan_completed, iwl_bg_scan_completed); 1068 INIT_WORK(&priv->abort_scan, iwl_bg_abort_scan); 1069 INIT_WORK(&priv->start_internal_scan, iwl_bg_start_internal_scan); 1070 INIT_DELAYED_WORK(&priv->scan_check, iwl_bg_scan_check); 1071} 1072 1073void iwl_cancel_scan_deferred_work(struct iwl_priv *priv) 1074{ 1075 cancel_work_sync(&priv->start_internal_scan); 1076 cancel_work_sync(&priv->abort_scan); 1077 cancel_work_sync(&priv->scan_completed); 1078 1079 if (cancel_delayed_work_sync(&priv->scan_check)) { 1080 mutex_lock(&priv->mutex); 1081 iwl_force_scan_end(priv); 1082 mutex_unlock(&priv->mutex); 1083 } 1084} 1085