1 /* 2 * Copyright (c) 2016-2021 The Linux Foundation. All rights reserved. 3 * Copyright (c) 2007-2008 Sam Leffler, Errno Consulting 4 * All rights reserved. 5 * Copyright (c) 2021-2022 Qualcomm Innovation Center, Inc. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 /** 29 * DOC: This file has the functions related to DFS CAC. 30 */ 31 32 #include "../dfs_channel.h" 33 #include "../dfs_zero_cac.h" 34 #include <wlan_objmgr_vdev_obj.h> 35 #include "wlan_dfs_utils_api.h" 36 #include "wlan_dfs_mlme_api.h" 37 #include "../dfs_internal.h" 38 #include "../dfs_process_radar_found_ind.h" 39 40 #define IS_CHANNEL_WEATHER_RADAR(freq) ((freq >= 5600) && (freq <= 5650)) 41 #define ADJACENT_WEATHER_RADAR_CHANNEL 5580 42 #define CH100_START_FREQ 5490 43 #define CH100 100 44 45 /** 46 * dfs_cac_valid_timeout() - Timeout function for dfs_cac_valid_timer 47 * cac_valid bit will be reset in this function. 48 */ 49 static os_timer_func(dfs_cac_valid_timeout) 50 { 51 struct wlan_dfs *dfs = NULL; 52 53 OS_GET_TIMER_ARG(dfs, struct wlan_dfs *); 54 dfs->dfs_cac_valid = 0; 55 dfs_info(dfs, WLAN_DEBUG_DFS_ALWAYS, ": Timed out!!"); 56 } 57 58 /** 59 * dfs_clear_cac_started_chan() - Clear dfs cac started channel. 60 * @dfs: Pointer to wlan_dfs structure. 61 */ 62 void dfs_clear_cac_started_chan(struct wlan_dfs *dfs) 63 { 64 qdf_mem_zero(&dfs->dfs_cac_started_chan, 65 sizeof(dfs->dfs_cac_started_chan)); 66 } 67 68 static void dfs_clear_nol_history_for_curchan(struct wlan_dfs *dfs) 69 { 70 struct dfs_channel *chan = dfs->dfs_curchan; 71 uint16_t sub_channels[MAX_20MHZ_SUBCHANS]; 72 uint8_t num_subchs; 73 74 num_subchs = dfs_get_bonding_channel_without_seg_info_for_freq( 75 chan, sub_channels); 76 77 if (dfs->dfs_is_stadfs_enabled) 78 if (dfs_mlme_is_opmode_sta(dfs->dfs_pdev_obj)) 79 utils_dfs_reg_update_nol_history_chan_for_freq( 80 dfs->dfs_pdev_obj, sub_channels, 81 num_subchs, DFS_NOL_HISTORY_RESET); 82 } 83 84 void dfs_process_cac_completion(struct wlan_dfs *dfs) 85 { 86 enum phy_ch_width ch_width = CH_WIDTH_INVALID; 87 uint16_t primary_chan_freq = 0, sec_chan_freq = 0; 88 struct dfs_channel *dfs_curchan; 89 90 dfs->dfs_cac_timer_running = 0; 91 dfs_curchan = dfs->dfs_curchan; 92 93 dfs_info(dfs, WLAN_DEBUG_DFS_ALWAYS, "cac expired, chan %d cur time %d", 94 dfs->dfs_curchan->dfs_ch_freq, 95 (qdf_system_ticks_to_msecs(qdf_system_ticks()) / 1000)); 96 97 /* 98 * When radar is detected during a CAC we are woken up prematurely to 99 * switch to a new channel. Check the channel to decide how to act. 100 */ 101 if (WLAN_IS_CHAN_RADAR(dfs, dfs->dfs_curchan)) { 102 dfs_mlme_mark_dfs(dfs->dfs_pdev_obj, 103 dfs_curchan->dfs_ch_ieee, 104 dfs_curchan->dfs_ch_freq, 105 dfs_curchan->dfs_ch_mhz_freq_seg2, 106 dfs_curchan->dfs_ch_flags, 107 0); 108 dfs_debug(dfs, WLAN_DEBUG_DFS, 109 "CAC timer on chan %u (%u MHz) stopped due to radar", 110 dfs_curchan->dfs_ch_ieee, 111 dfs_curchan->dfs_ch_freq); 112 } else { 113 dfs_debug(dfs, WLAN_DEBUG_DFS, 114 "CAC timer on channel %u (%u MHz) expired;" 115 "no radar detected", 116 dfs_curchan->dfs_ch_ieee, 117 dfs_curchan->dfs_ch_freq); 118 119 /* On CAC completion, set the bit 'cac_valid'. 120 * CAC will not be re-done if this bit is reset. 121 * The flag will be reset when dfs_cac_valid_timer 122 * timesout. 123 */ 124 if (dfs->dfs_cac_valid_time) { 125 dfs->dfs_cac_valid = 1; 126 qdf_timer_mod(&dfs->dfs_cac_valid_timer, 127 dfs->dfs_cac_valid_time * 1000); 128 } 129 130 dfs_find_curchwidth_and_center_chan_for_freq(dfs, 131 &ch_width, 132 &primary_chan_freq, 133 &sec_chan_freq); 134 135 /* ETSI allows the driver to cache the CAC ( Once CAC done, 136 * it can be used in future). 137 * Therefore mark the current channel CAC done. 138 */ 139 if (utils_get_dfsdomain(dfs->dfs_pdev_obj) == DFS_ETSI_DOMAIN) 140 dfs_mark_precac_done_for_freq(dfs, 141 primary_chan_freq, 142 sec_chan_freq, 143 ch_width); 144 } 145 146 dfs_clear_cac_started_chan(dfs); 147 148 /* Clear NOL history for current channel on successful CAC completion */ 149 dfs_clear_nol_history_for_curchan(dfs); 150 /* Iterate over the nodes, processing the CAC completion event. */ 151 dfs_mlme_proc_cac(dfs->dfs_pdev_obj, 0); 152 153 /* Send a CAC timeout, VAP up event to user space */ 154 dfs_mlme_deliver_event_up_after_cac(dfs->dfs_pdev_obj); 155 156 if (dfs->dfs_defer_precac_channel_change == 1) { 157 dfs_mlme_channel_change_by_precac(dfs->dfs_pdev_obj); 158 dfs->dfs_defer_precac_channel_change = 0; 159 } 160 } 161 162 /** 163 * dfs_cac_timeout() - DFS cactimeout function. 164 * 165 * Sets dfs_cac_timer_running to 0 and dfs_cac_valid_timer. 166 */ 167 #ifdef CONFIG_CHAN_FREQ_API 168 static enum qdf_hrtimer_restart_status 169 dfs_cac_timeout(qdf_hrtimer_data_t *arg) 170 { 171 struct wlan_dfs *dfs; 172 173 dfs = container_of(arg, struct wlan_dfs, dfs_cac_timer); 174 175 if (dfs_is_hw_mode_switch_in_progress(dfs)) 176 dfs->dfs_defer_params.is_cac_completed = true; 177 else 178 dfs_process_cac_completion(dfs); 179 180 return QDF_HRTIMER_NORESTART; 181 } 182 #endif 183 184 #ifdef QCA_SUPPORT_DFS_CAC 185 void dfs_cac_timer_attach(struct wlan_dfs *dfs) 186 { 187 dfs->dfs_cac_timeout_override = -1; 188 dfs->wlan_dfs_cac_time = WLAN_DFS_WAIT_MS; 189 qdf_hrtimer_init(&dfs->dfs_cac_timer, 190 dfs_cac_timeout, 191 QDF_CLOCK_MONOTONIC, 192 QDF_HRTIMER_MODE_REL, 193 QDF_CONTEXT_TASKLET); 194 qdf_timer_init(NULL, 195 &(dfs->dfs_cac_valid_timer), 196 dfs_cac_valid_timeout, 197 (void *)(dfs), 198 QDF_TIMER_TYPE_WAKE_APPS); 199 } 200 201 void dfs_cac_timer_reset(struct wlan_dfs *dfs) 202 { 203 qdf_hrtimer_cancel(&dfs->dfs_cac_timer); 204 dfs_get_override_cac_timeout(dfs, 205 &(dfs->dfs_cac_timeout_override)); 206 dfs_clear_cac_started_chan(dfs); 207 } 208 209 void dfs_cac_timer_detach(struct wlan_dfs *dfs) 210 { 211 qdf_hrtimer_kill(&dfs->dfs_cac_timer); 212 qdf_timer_free(&dfs->dfs_cac_valid_timer); 213 dfs->dfs_cac_valid = 0; 214 } 215 216 int dfs_is_ap_cac_timer_running(struct wlan_dfs *dfs) 217 { 218 return dfs->dfs_cac_timer_running; 219 } 220 221 #ifdef CONFIG_CHAN_FREQ_API 222 void dfs_start_cac_timer(struct wlan_dfs *dfs) 223 { 224 int cac_timeout = 0; 225 struct dfs_channel *chan = dfs->dfs_curchan; 226 227 cac_timeout = 228 dfs_mlme_get_cac_timeout_for_freq(dfs->dfs_pdev_obj, 229 chan->dfs_ch_freq, 230 chan->dfs_ch_mhz_freq_seg2, 231 chan->dfs_ch_flags); 232 233 dfs->dfs_cac_started_chan = *chan; 234 235 dfs_deliver_cac_state_events(dfs); 236 dfs_debug(dfs, WLAN_DEBUG_DFS, 237 "chan = %d cfreq2 = %d timeout = %d sec, curr_time = %d sec", 238 chan->dfs_ch_ieee, chan->dfs_ch_vhtop_ch_freq_seg2, 239 cac_timeout, 240 qdf_system_ticks_to_msecs(qdf_system_ticks()) / 1000); 241 242 qdf_hrtimer_start(&dfs->dfs_cac_timer, 243 qdf_time_ms_to_ktime(cac_timeout * 1000), 244 QDF_HRTIMER_MODE_REL); 245 dfs->dfs_cac_aborted = 0; 246 } 247 #endif 248 249 void dfs_cancel_cac_timer(struct wlan_dfs *dfs) 250 { 251 qdf_hrtimer_cancel(&dfs->dfs_cac_timer); 252 dfs_clear_cac_started_chan(dfs); 253 } 254 255 void dfs_send_dfs_events_for_chan(struct wlan_dfs *dfs, 256 struct dfs_channel *chan, 257 enum WLAN_DFS_EVENTS event) 258 { 259 uint8_t nchannels, i; 260 qdf_freq_t freq_list[MAX_20MHZ_SUBCHANS]; 261 262 nchannels = 263 dfs_get_bonding_channel_without_seg_info_for_freq(chan, 264 freq_list); 265 for (i = 0; i < nchannels; i++) 266 utils_dfs_deliver_event(dfs->dfs_pdev_obj, 267 freq_list[i], 268 event); 269 } 270 271 void dfs_cac_stop(struct wlan_dfs *dfs) 272 { 273 uint32_t phyerr; 274 struct dfs_channel *chan; 275 276 chan = &dfs->dfs_cac_started_chan; 277 dfs_get_debug_info(dfs, (void *)&phyerr); 278 dfs_debug(dfs, WLAN_DEBUG_DFS, 279 "Stopping CAC Timer %d procphyerr 0x%08x", 280 dfs->dfs_curchan->dfs_ch_freq, phyerr); 281 qdf_hrtimer_cancel(&dfs->dfs_cac_timer); 282 283 dfs_send_dfs_events_for_chan(dfs, chan, WLAN_EV_CAC_RESET); 284 285 if (dfs->dfs_cac_timer_running) 286 dfs->dfs_cac_aborted = 1; 287 dfs_clear_cac_started_chan(dfs); 288 dfs->dfs_cac_timer_running = 0; 289 } 290 291 void dfs_stacac_stop(struct wlan_dfs *dfs) 292 { 293 uint32_t phyerr; 294 295 dfs_get_debug_info(dfs, (void *)&phyerr); 296 dfs_debug(dfs, WLAN_DEBUG_DFS, 297 "Stopping STA CAC Timer %d procphyerr 0x%08x", 298 dfs->dfs_curchan->dfs_ch_freq, phyerr); 299 dfs_clear_cac_started_chan(dfs); 300 } 301 302 int dfs_override_cac_timeout(struct wlan_dfs *dfs, int cac_timeout) 303 { 304 if (!dfs) 305 return -EIO; 306 307 dfs->dfs_cac_timeout_override = cac_timeout; 308 dfs_info(dfs, WLAN_DEBUG_DFS_ALWAYS, "CAC timeout is now %s %d", 309 (cac_timeout == -1) ? "default" : "overridden", 310 cac_timeout); 311 312 return 0; 313 } 314 315 int dfs_get_override_cac_timeout(struct wlan_dfs *dfs, int *cac_timeout) 316 { 317 if (!dfs) 318 return -EIO; 319 320 (*cac_timeout) = dfs->dfs_cac_timeout_override; 321 322 return 0; 323 } 324 325 #ifdef CONFIG_CHAN_FREQ_API 326 void dfs_cac_valid_reset_for_freq(struct wlan_dfs *dfs, 327 uint16_t prevchan_freq, 328 uint32_t prevchan_flags) 329 { 330 if (dfs->dfs_cac_valid_time) { 331 if ((prevchan_freq != dfs->dfs_curchan->dfs_ch_freq) || 332 (prevchan_flags != dfs->dfs_curchan->dfs_ch_flags)) { 333 dfs_err(dfs, WLAN_DEBUG_DFS_ALWAYS, 334 "Cancelling timer & clearing cac_valid"); 335 qdf_timer_stop(&dfs->dfs_cac_valid_timer); 336 dfs->dfs_cac_valid = 0; 337 } 338 } 339 } 340 #endif 341 #endif 342 343 #ifdef CONFIG_CHAN_FREQ_API 344 bool 345 dfs_is_subset_channel_for_freq(uint16_t *old_subchans_freq, 346 uint8_t old_n_chans, 347 uint16_t *new_subchans_freq, 348 uint8_t new_n_chans) 349 { 350 bool is_found; 351 int i, j; 352 353 if (!new_n_chans) 354 return true; 355 356 if (new_n_chans > old_n_chans) 357 return false; 358 359 for (i = 0; i < new_n_chans; i++) { 360 is_found = false; 361 for (j = 0; j < old_n_chans; j++) { 362 if (new_subchans_freq[i] == old_subchans_freq[j]) { 363 is_found = true; 364 break; 365 } 366 } 367 368 /* If new_subchans[i] is not found in old_subchans, then, 369 * new_chan is not subset of old_chan. 370 */ 371 if (!is_found) 372 break; 373 } 374 375 return is_found; 376 } 377 #endif 378 379 #ifdef CONFIG_CHAN_FREQ_API 380 uint8_t 381 dfs_find_dfs_sub_channels_for_freq(struct wlan_dfs *dfs, 382 struct dfs_channel *chan, 383 uint16_t *subchan_arr) 384 { 385 if (WLAN_IS_CHAN_MODE_160(chan) || WLAN_IS_CHAN_MODE_80_80(chan)) { 386 if (WLAN_IS_CHAN_DFS(chan) && WLAN_IS_CHAN_DFS_CFREQ2(chan)) 387 return dfs_get_bonding_channel_without_seg_info_for_freq 388 (chan, subchan_arr); 389 if (WLAN_IS_CHAN_DFS(chan)) 390 return dfs_get_bonding_channels_for_freq(dfs, 391 chan, 392 SEG_ID_PRIMARY, 393 DETECTOR_ID_0, 394 subchan_arr); 395 if (WLAN_IS_CHAN_DFS_CFREQ2(chan)) 396 return dfs_get_bonding_channels_for_freq 397 (dfs, chan, SEG_ID_SECONDARY, 398 DETECTOR_ID_0, subchan_arr); 399 /* All channels in 160/80_80 BW are non DFS, return 0 400 * as number of subchannels 401 */ 402 return 0; 403 } else if (WLAN_IS_CHAN_DFS(chan)) { 404 return dfs_get_bonding_channel_without_seg_info_for_freq 405 (chan, subchan_arr); 406 } 407 /* All channels are non DFS, return 0 as number of subchannels*/ 408 return 0; 409 } 410 #endif 411 412 #ifdef CONFIG_CHAN_FREQ_API 413 bool 414 dfs_is_new_chan_subset_of_old_chan(struct wlan_dfs *dfs, 415 struct dfs_channel *new_chan, 416 struct dfs_channel *old_chan) 417 { 418 uint16_t new_subchans[MAX_20MHZ_SUBCHANS]; 419 uint16_t old_subchans[MAX_20MHZ_SUBCHANS]; 420 uint8_t n_new_subchans = 0; 421 uint8_t n_old_subchans = 0; 422 423 /* Given channel is the old channel. i.e. The channel which 424 * should have the new channel as subset. 425 */ 426 n_old_subchans = dfs_find_dfs_sub_channels_for_freq(dfs, old_chan, 427 old_subchans); 428 /* cur_chan is the new channel to be check if subset of old channel */ 429 n_new_subchans = dfs_find_dfs_sub_channels_for_freq(dfs, new_chan, 430 new_subchans); 431 432 return dfs_is_subset_channel_for_freq(old_subchans, 433 n_old_subchans, 434 new_subchans, 435 n_new_subchans); 436 } 437 #endif 438 439 #ifdef QCA_SUPPORT_DFS_CAC 440 bool dfs_is_cac_required(struct wlan_dfs *dfs, 441 struct dfs_channel *cur_chan, 442 struct dfs_channel *prev_chan, 443 bool *continue_current_cac, 444 bool is_vap_restart) 445 { 446 struct dfs_channel *cac_started_chan = &dfs->dfs_cac_started_chan; 447 448 if (!WLAN_IS_PRIMARY_OR_SECONDARY_CHAN_DFS(cur_chan)) { 449 dfs_debug(dfs, WLAN_DEBUG_DFS, "Skip CAC on non-DFS channel"); 450 return false; 451 } 452 453 if (dfs->dfs_ignore_dfs || dfs->dfs_cac_valid || dfs->dfs_ignore_cac) { 454 dfs_debug(dfs, WLAN_DEBUG_DFS, 455 "Skip CAC, ignore_dfs = %d cac_valid = %d ignore_cac = %d", 456 dfs->dfs_ignore_dfs, dfs->dfs_cac_valid, 457 dfs->dfs_ignore_cac); 458 return false; 459 } 460 461 /* In case of RCAC, check if CAC is completed only on the RCAC channel 462 * and do not check the CAC info on current operating channel. 463 */ 464 if (dfs_is_agile_rcac_enabled(dfs) && 465 dfs_is_rcac_cac_done(dfs, cur_chan, prev_chan)) 466 return false; 467 468 /* If the channel has completed PRE-CAC then CAC can be skipped here. */ 469 if (dfs_is_precac_done(dfs, cur_chan)) { 470 dfs_debug(dfs, WLAN_DEBUG_DFS, 471 "PRE-CAC already done on this channel %d", 472 cur_chan->dfs_ch_ieee); 473 return false; 474 } 475 476 if (dfs_is_ap_cac_timer_running(dfs)) { 477 /* Check if we should continue the existing CAC or 478 * cancel the existing CAC. 479 * For example: - if an existing VAP(0) is already in 480 * DFS wait state (which means the radio(wifi) is 481 * running the CAC) and it is in channel A and another 482 * VAP(1) comes up in the same channel then instead of 483 * cancelling the CAC we can let the CAC continue. 484 */ 485 if (dfs_is_new_chan_subset_of_old_chan(dfs, 486 cur_chan, 487 cac_started_chan)) { 488 if (continue_current_cac) 489 *continue_current_cac = true; 490 } else { 491 /* New CAC is needed, cancel the running CAC 492 * timer. 493 * 1) When AP is in DFS_WAIT state and it is in 494 * channel A and user restarts the AP vap in 495 * channel B, then cancel the running CAC in 496 * channel A and start new CAC in channel B. 497 * 498 * 2) When AP detects the RADAR during CAC in 499 * channel A, it cancels the running CAC and 500 * tries to find channel B with the reduced 501 * bandwidth with of channel A. 502 * In this case, since the CAC is aborted by 503 * the RADAR, AP should start the CAC again. 504 */ 505 dfs_cancel_cac_timer(dfs); 506 } 507 } else { /* CAC timer is not running. */ 508 /* If channel change happens via VAP DOWN/UP on subset channels, 509 * (eg: from 52 HT80 to 64 HT80) CAC done information 510 * (of 52 HT80) based on subset logic 511 * (as 52 and 64 HT80 are subsets of each other) 512 * is not expected to be preserved as VAP has come up 513 * from DOWN state. Hence do not skip CAC on 64 HT80. 514 * is_vap_restart flag is used as an identifier to indicate if 515 * vap has come up from a DOWN state or UP state (vap restart). 516 */ 517 if (!is_vap_restart) { 518 dfs_debug(dfs, WLAN_DEBUG_DFS, "CAC is needed"); 519 return true; 520 } 521 if (dfs_is_new_chan_subset_of_old_chan(dfs, 522 cur_chan, 523 prev_chan)) { 524 /* AP bandwidth reduce case: 525 * When AP detects the RADAR in in-service monitoring 526 * mode in channel A, it cancels the running CAC and 527 * tries to find the channel B with the reduced 528 * bandwidth of channel A. 529 * If the new channel B is subset of the channel A 530 * then AP skips the CAC. 531 */ 532 if (!dfs->dfs_cac_aborted) { 533 dfs_debug(dfs, WLAN_DEBUG_DFS, "Skip CAC"); 534 return false; 535 } 536 } 537 } 538 539 return true; 540 } 541 #endif 542