1 /****************************************************************************** 2 * 3 * Copyright(c) 2003 - 2014 Intel Corporation. All rights reserved. 4 * Copyright(c) 2015 Intel Deutschland GmbH 5 * Copyright(c) 2018 Intel Corporation 6 * 7 * Portions of this file are derived from the ipw3945 project, as well 8 * as portionhelp of the ieee80211 subsystem header files. 9 * 10 * This program is free software; you can redistribute it and/or modify it 11 * under the terms of version 2 of the GNU General Public License as 12 * published by the Free Software Foundation. 13 * 14 * This program is distributed in the hope that it will be useful, but WITHOUT 15 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 16 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 17 * more details. 18 * 19 * The full GNU General Public License is included in this distribution in the 20 * file called LICENSE. 21 * 22 * Contact Information: 23 * Intel Linux Wireless <linuxwifi@intel.com> 24 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 25 * 26 *****************************************************************************/ 27 28 #include <linux/etherdevice.h> 29 #include <linux/slab.h> 30 #include <linux/sched.h> 31 #include <net/mac80211.h> 32 #include <asm/unaligned.h> 33 34 #include "iwl-trans.h" 35 #include "iwl-io.h" 36 #include "dev.h" 37 #include "calib.h" 38 #include "agn.h" 39 40 /****************************************************************************** 41 * 42 * Generic RX handler implementations 43 * 44 ******************************************************************************/ 45 46 static void iwlagn_rx_reply_error(struct iwl_priv *priv, 47 struct iwl_rx_cmd_buffer *rxb) 48 { 49 struct iwl_rx_packet *pkt = rxb_addr(rxb); 50 struct iwl_error_resp *err_resp = (void *)pkt->data; 51 52 IWL_ERR(priv, "Error Reply type 0x%08X cmd REPLY_ERROR (0x%02X) " 53 "seq 0x%04X ser 0x%08X\n", 54 le32_to_cpu(err_resp->error_type), 55 err_resp->cmd_id, 56 le16_to_cpu(err_resp->bad_cmd_seq_num), 57 le32_to_cpu(err_resp->error_info)); 58 } 59 60 static void iwlagn_rx_csa(struct iwl_priv *priv, struct iwl_rx_cmd_buffer *rxb) 61 { 62 struct iwl_rx_packet *pkt = rxb_addr(rxb); 63 struct iwl_csa_notification *csa = (void *)pkt->data; 64 /* 65 * MULTI-FIXME 66 * See iwlagn_mac_channel_switch. 67 */ 68 struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS]; 69 struct iwl_rxon_cmd *rxon = (void *)&ctx->active; 70 71 if (!test_bit(STATUS_CHANNEL_SWITCH_PENDING, &priv->status)) 72 return; 73 74 if (!le32_to_cpu(csa->status) && csa->channel == priv->switch_channel) { 75 rxon->channel = csa->channel; 76 ctx->staging.channel = csa->channel; 77 IWL_DEBUG_11H(priv, "CSA notif: channel %d\n", 78 le16_to_cpu(csa->channel)); 79 iwl_chswitch_done(priv, true); 80 } else { 81 IWL_ERR(priv, "CSA notif (fail) : channel %d\n", 82 le16_to_cpu(csa->channel)); 83 iwl_chswitch_done(priv, false); 84 } 85 } 86 87 88 static void iwlagn_rx_spectrum_measure_notif(struct iwl_priv *priv, 89 struct iwl_rx_cmd_buffer *rxb) 90 { 91 struct iwl_rx_packet *pkt = rxb_addr(rxb); 92 struct iwl_spectrum_notification *report = (void *)pkt->data; 93 94 if (!report->state) { 95 IWL_DEBUG_11H(priv, 96 "Spectrum Measure Notification: Start\n"); 97 return; 98 } 99 100 memcpy(&priv->measure_report, report, sizeof(*report)); 101 priv->measurement_status |= MEASUREMENT_READY; 102 } 103 104 static void iwlagn_rx_pm_sleep_notif(struct iwl_priv *priv, 105 struct iwl_rx_cmd_buffer *rxb) 106 { 107 #ifdef CONFIG_IWLWIFI_DEBUG 108 struct iwl_rx_packet *pkt = rxb_addr(rxb); 109 struct iwl_sleep_notification *sleep = (void *)pkt->data; 110 IWL_DEBUG_RX(priv, "sleep mode: %d, src: %d\n", 111 sleep->pm_sleep_mode, sleep->pm_wakeup_src); 112 #endif 113 } 114 115 static void iwlagn_rx_pm_debug_statistics_notif(struct iwl_priv *priv, 116 struct iwl_rx_cmd_buffer *rxb) 117 { 118 struct iwl_rx_packet *pkt = rxb_addr(rxb); 119 u32 __maybe_unused len = iwl_rx_packet_len(pkt); 120 IWL_DEBUG_RADIO(priv, "Dumping %d bytes of unhandled " 121 "notification for PM_DEBUG_STATISTIC_NOTIFIC:\n", len); 122 iwl_print_hex_dump(priv, IWL_DL_RADIO, pkt->data, len); 123 } 124 125 static void iwlagn_rx_beacon_notif(struct iwl_priv *priv, 126 struct iwl_rx_cmd_buffer *rxb) 127 { 128 struct iwl_rx_packet *pkt = rxb_addr(rxb); 129 struct iwlagn_beacon_notif *beacon = (void *)pkt->data; 130 #ifdef CONFIG_IWLWIFI_DEBUG 131 u16 status = le16_to_cpu(beacon->beacon_notify_hdr.status.status); 132 u8 rate = iwl_hw_get_rate(beacon->beacon_notify_hdr.rate_n_flags); 133 134 IWL_DEBUG_RX(priv, "beacon status %#x, retries:%d ibssmgr:%d " 135 "tsf:0x%.8x%.8x rate:%d\n", 136 status & TX_STATUS_MSK, 137 beacon->beacon_notify_hdr.failure_frame, 138 le32_to_cpu(beacon->ibss_mgr_status), 139 le32_to_cpu(beacon->high_tsf), 140 le32_to_cpu(beacon->low_tsf), rate); 141 #endif 142 143 priv->ibss_manager = le32_to_cpu(beacon->ibss_mgr_status); 144 } 145 146 /** 147 * iwl_good_plcp_health - checks for plcp error. 148 * 149 * When the plcp error is exceeding the thresholds, reset the radio 150 * to improve the throughput. 151 */ 152 static bool iwlagn_good_plcp_health(struct iwl_priv *priv, 153 struct statistics_rx_phy *cur_ofdm, 154 struct statistics_rx_ht_phy *cur_ofdm_ht, 155 unsigned int msecs) 156 { 157 int delta; 158 int threshold = priv->plcp_delta_threshold; 159 160 if (threshold == IWL_MAX_PLCP_ERR_THRESHOLD_DISABLE) { 161 IWL_DEBUG_RADIO(priv, "plcp_err check disabled\n"); 162 return true; 163 } 164 165 delta = le32_to_cpu(cur_ofdm->plcp_err) - 166 le32_to_cpu(priv->statistics.rx_ofdm.plcp_err) + 167 le32_to_cpu(cur_ofdm_ht->plcp_err) - 168 le32_to_cpu(priv->statistics.rx_ofdm_ht.plcp_err); 169 170 /* Can be negative if firmware reset statistics */ 171 if (delta <= 0) 172 return true; 173 174 if ((delta * 100 / msecs) > threshold) { 175 IWL_DEBUG_RADIO(priv, 176 "plcp health threshold %u delta %d msecs %u\n", 177 threshold, delta, msecs); 178 return false; 179 } 180 181 return true; 182 } 183 184 int iwl_force_rf_reset(struct iwl_priv *priv, bool external) 185 { 186 struct iwl_rf_reset *rf_reset; 187 188 if (test_bit(STATUS_EXIT_PENDING, &priv->status)) 189 return -EAGAIN; 190 191 if (!iwl_is_any_associated(priv)) { 192 IWL_DEBUG_SCAN(priv, "force reset rejected: not associated\n"); 193 return -ENOLINK; 194 } 195 196 rf_reset = &priv->rf_reset; 197 rf_reset->reset_request_count++; 198 if (!external && rf_reset->last_reset_jiffies && 199 time_after(rf_reset->last_reset_jiffies + 200 IWL_DELAY_NEXT_FORCE_RF_RESET, jiffies)) { 201 IWL_DEBUG_INFO(priv, "RF reset rejected\n"); 202 rf_reset->reset_reject_count++; 203 return -EAGAIN; 204 } 205 rf_reset->reset_success_count++; 206 rf_reset->last_reset_jiffies = jiffies; 207 208 /* 209 * There is no easy and better way to force reset the radio, 210 * the only known method is switching channel which will force to 211 * reset and tune the radio. 212 * Use internal short scan (single channel) operation to should 213 * achieve this objective. 214 * Driver should reset the radio when number of consecutive missed 215 * beacon, or any other uCode error condition detected. 216 */ 217 IWL_DEBUG_INFO(priv, "perform radio reset.\n"); 218 iwl_internal_short_hw_scan(priv); 219 return 0; 220 } 221 222 223 static void iwlagn_recover_from_statistics(struct iwl_priv *priv, 224 struct statistics_rx_phy *cur_ofdm, 225 struct statistics_rx_ht_phy *cur_ofdm_ht, 226 struct statistics_tx *tx, 227 unsigned long stamp) 228 { 229 unsigned int msecs; 230 231 if (test_bit(STATUS_EXIT_PENDING, &priv->status)) 232 return; 233 234 msecs = jiffies_to_msecs(stamp - priv->rx_statistics_jiffies); 235 236 /* Only gather statistics and update time stamp when not associated */ 237 if (!iwl_is_any_associated(priv)) 238 return; 239 240 /* Do not check/recover when do not have enough statistics data */ 241 if (msecs < 99) 242 return; 243 244 if (!iwlagn_good_plcp_health(priv, cur_ofdm, cur_ofdm_ht, msecs)) 245 iwl_force_rf_reset(priv, false); 246 } 247 248 /* Calculate noise level, based on measurements during network silence just 249 * before arriving beacon. This measurement can be done only if we know 250 * exactly when to expect beacons, therefore only when we're associated. */ 251 static void iwlagn_rx_calc_noise(struct iwl_priv *priv) 252 { 253 struct statistics_rx_non_phy *rx_info; 254 int num_active_rx = 0; 255 int total_silence = 0; 256 int bcn_silence_a, bcn_silence_b, bcn_silence_c; 257 int last_rx_noise; 258 259 rx_info = &priv->statistics.rx_non_phy; 260 261 bcn_silence_a = 262 le32_to_cpu(rx_info->beacon_silence_rssi_a) & IN_BAND_FILTER; 263 bcn_silence_b = 264 le32_to_cpu(rx_info->beacon_silence_rssi_b) & IN_BAND_FILTER; 265 bcn_silence_c = 266 le32_to_cpu(rx_info->beacon_silence_rssi_c) & IN_BAND_FILTER; 267 268 if (bcn_silence_a) { 269 total_silence += bcn_silence_a; 270 num_active_rx++; 271 } 272 if (bcn_silence_b) { 273 total_silence += bcn_silence_b; 274 num_active_rx++; 275 } 276 if (bcn_silence_c) { 277 total_silence += bcn_silence_c; 278 num_active_rx++; 279 } 280 281 /* Average among active antennas */ 282 if (num_active_rx) 283 last_rx_noise = (total_silence / num_active_rx) - 107; 284 else 285 last_rx_noise = IWL_NOISE_MEAS_NOT_AVAILABLE; 286 287 IWL_DEBUG_CALIB(priv, "inband silence a %u, b %u, c %u, dBm %d\n", 288 bcn_silence_a, bcn_silence_b, bcn_silence_c, 289 last_rx_noise); 290 } 291 292 #ifdef CONFIG_IWLWIFI_DEBUGFS 293 /* 294 * based on the assumption of all statistics counter are in DWORD 295 * FIXME: This function is for debugging, do not deal with 296 * the case of counters roll-over. 297 */ 298 static void accum_stats(__le32 *prev, __le32 *cur, __le32 *delta, 299 __le32 *max_delta, __le32 *accum, int size) 300 { 301 int i; 302 303 for (i = 0; 304 i < size / sizeof(__le32); 305 i++, prev++, cur++, delta++, max_delta++, accum++) { 306 if (le32_to_cpu(*cur) > le32_to_cpu(*prev)) { 307 *delta = cpu_to_le32( 308 le32_to_cpu(*cur) - le32_to_cpu(*prev)); 309 le32_add_cpu(accum, le32_to_cpu(*delta)); 310 if (le32_to_cpu(*delta) > le32_to_cpu(*max_delta)) 311 *max_delta = *delta; 312 } 313 } 314 } 315 316 static void 317 iwlagn_accumulative_statistics(struct iwl_priv *priv, 318 struct statistics_general_common *common, 319 struct statistics_rx_non_phy *rx_non_phy, 320 struct statistics_rx_phy *rx_ofdm, 321 struct statistics_rx_ht_phy *rx_ofdm_ht, 322 struct statistics_rx_phy *rx_cck, 323 struct statistics_tx *tx, 324 struct statistics_bt_activity *bt_activity) 325 { 326 #define ACCUM(_name) \ 327 accum_stats((__le32 *)&priv->statistics._name, \ 328 (__le32 *)_name, \ 329 (__le32 *)&priv->delta_stats._name, \ 330 (__le32 *)&priv->max_delta_stats._name, \ 331 (__le32 *)&priv->accum_stats._name, \ 332 sizeof(*_name)); 333 334 ACCUM(common); 335 ACCUM(rx_non_phy); 336 ACCUM(rx_ofdm); 337 ACCUM(rx_ofdm_ht); 338 ACCUM(rx_cck); 339 ACCUM(tx); 340 if (bt_activity) 341 ACCUM(bt_activity); 342 #undef ACCUM 343 } 344 #else 345 static inline void 346 iwlagn_accumulative_statistics(struct iwl_priv *priv, 347 struct statistics_general_common *common, 348 struct statistics_rx_non_phy *rx_non_phy, 349 struct statistics_rx_phy *rx_ofdm, 350 struct statistics_rx_ht_phy *rx_ofdm_ht, 351 struct statistics_rx_phy *rx_cck, 352 struct statistics_tx *tx, 353 struct statistics_bt_activity *bt_activity) 354 { 355 } 356 #endif 357 358 static void iwlagn_rx_statistics(struct iwl_priv *priv, 359 struct iwl_rx_cmd_buffer *rxb) 360 { 361 unsigned long stamp = jiffies; 362 const int reg_recalib_period = 60; 363 int change; 364 struct iwl_rx_packet *pkt = rxb_addr(rxb); 365 u32 len = iwl_rx_packet_payload_len(pkt); 366 __le32 *flag; 367 struct statistics_general_common *common; 368 struct statistics_rx_non_phy *rx_non_phy; 369 struct statistics_rx_phy *rx_ofdm; 370 struct statistics_rx_ht_phy *rx_ofdm_ht; 371 struct statistics_rx_phy *rx_cck; 372 struct statistics_tx *tx; 373 struct statistics_bt_activity *bt_activity; 374 375 IWL_DEBUG_RX(priv, "Statistics notification received (%d bytes).\n", 376 len); 377 378 spin_lock(&priv->statistics.lock); 379 380 if (len == sizeof(struct iwl_bt_notif_statistics)) { 381 struct iwl_bt_notif_statistics *stats; 382 stats = (void *)&pkt->data; 383 flag = &stats->flag; 384 common = &stats->general.common; 385 rx_non_phy = &stats->rx.general.common; 386 rx_ofdm = &stats->rx.ofdm; 387 rx_ofdm_ht = &stats->rx.ofdm_ht; 388 rx_cck = &stats->rx.cck; 389 tx = &stats->tx; 390 bt_activity = &stats->general.activity; 391 392 #ifdef CONFIG_IWLWIFI_DEBUGFS 393 /* handle this exception directly */ 394 priv->statistics.num_bt_kills = stats->rx.general.num_bt_kills; 395 le32_add_cpu(&priv->statistics.accum_num_bt_kills, 396 le32_to_cpu(stats->rx.general.num_bt_kills)); 397 #endif 398 } else if (len == sizeof(struct iwl_notif_statistics)) { 399 struct iwl_notif_statistics *stats; 400 stats = (void *)&pkt->data; 401 flag = &stats->flag; 402 common = &stats->general.common; 403 rx_non_phy = &stats->rx.general; 404 rx_ofdm = &stats->rx.ofdm; 405 rx_ofdm_ht = &stats->rx.ofdm_ht; 406 rx_cck = &stats->rx.cck; 407 tx = &stats->tx; 408 bt_activity = NULL; 409 } else { 410 WARN_ONCE(1, "len %d doesn't match BT (%zu) or normal (%zu)\n", 411 len, sizeof(struct iwl_bt_notif_statistics), 412 sizeof(struct iwl_notif_statistics)); 413 spin_unlock(&priv->statistics.lock); 414 return; 415 } 416 417 change = common->temperature != priv->statistics.common.temperature || 418 (*flag & STATISTICS_REPLY_FLG_HT40_MODE_MSK) != 419 (priv->statistics.flag & STATISTICS_REPLY_FLG_HT40_MODE_MSK); 420 421 iwlagn_accumulative_statistics(priv, common, rx_non_phy, rx_ofdm, 422 rx_ofdm_ht, rx_cck, tx, bt_activity); 423 424 iwlagn_recover_from_statistics(priv, rx_ofdm, rx_ofdm_ht, tx, stamp); 425 426 priv->statistics.flag = *flag; 427 memcpy(&priv->statistics.common, common, sizeof(*common)); 428 memcpy(&priv->statistics.rx_non_phy, rx_non_phy, sizeof(*rx_non_phy)); 429 memcpy(&priv->statistics.rx_ofdm, rx_ofdm, sizeof(*rx_ofdm)); 430 memcpy(&priv->statistics.rx_ofdm_ht, rx_ofdm_ht, sizeof(*rx_ofdm_ht)); 431 memcpy(&priv->statistics.rx_cck, rx_cck, sizeof(*rx_cck)); 432 memcpy(&priv->statistics.tx, tx, sizeof(*tx)); 433 #ifdef CONFIG_IWLWIFI_DEBUGFS 434 if (bt_activity) 435 memcpy(&priv->statistics.bt_activity, bt_activity, 436 sizeof(*bt_activity)); 437 #endif 438 439 priv->rx_statistics_jiffies = stamp; 440 441 set_bit(STATUS_STATISTICS, &priv->status); 442 443 /* Reschedule the statistics timer to occur in 444 * reg_recalib_period seconds to ensure we get a 445 * thermal update even if the uCode doesn't give 446 * us one */ 447 mod_timer(&priv->statistics_periodic, jiffies + 448 msecs_to_jiffies(reg_recalib_period * 1000)); 449 450 if (unlikely(!test_bit(STATUS_SCANNING, &priv->status)) && 451 (pkt->hdr.cmd == STATISTICS_NOTIFICATION)) { 452 iwlagn_rx_calc_noise(priv); 453 queue_work(priv->workqueue, &priv->run_time_calib_work); 454 } 455 if (priv->lib->temperature && change) 456 priv->lib->temperature(priv); 457 458 spin_unlock(&priv->statistics.lock); 459 } 460 461 static void iwlagn_rx_reply_statistics(struct iwl_priv *priv, 462 struct iwl_rx_cmd_buffer *rxb) 463 { 464 struct iwl_rx_packet *pkt = rxb_addr(rxb); 465 struct iwl_notif_statistics *stats = (void *)pkt->data; 466 467 if (le32_to_cpu(stats->flag) & UCODE_STATISTICS_CLEAR_MSK) { 468 #ifdef CONFIG_IWLWIFI_DEBUGFS 469 memset(&priv->accum_stats, 0, 470 sizeof(priv->accum_stats)); 471 memset(&priv->delta_stats, 0, 472 sizeof(priv->delta_stats)); 473 memset(&priv->max_delta_stats, 0, 474 sizeof(priv->max_delta_stats)); 475 #endif 476 IWL_DEBUG_RX(priv, "Statistics have been cleared\n"); 477 } 478 479 iwlagn_rx_statistics(priv, rxb); 480 } 481 482 /* Handle notification from uCode that card's power state is changing 483 * due to software, hardware, or critical temperature RFKILL */ 484 static void iwlagn_rx_card_state_notif(struct iwl_priv *priv, 485 struct iwl_rx_cmd_buffer *rxb) 486 { 487 struct iwl_rx_packet *pkt = rxb_addr(rxb); 488 struct iwl_card_state_notif *card_state_notif = (void *)pkt->data; 489 u32 flags = le32_to_cpu(card_state_notif->flags); 490 unsigned long status = priv->status; 491 492 IWL_DEBUG_RF_KILL(priv, "Card state received: HW:%s SW:%s CT:%s\n", 493 (flags & HW_CARD_DISABLED) ? "Kill" : "On", 494 (flags & SW_CARD_DISABLED) ? "Kill" : "On", 495 (flags & CT_CARD_DISABLED) ? 496 "Reached" : "Not reached"); 497 498 if (flags & (SW_CARD_DISABLED | HW_CARD_DISABLED | 499 CT_CARD_DISABLED)) { 500 501 iwl_write32(priv->trans, CSR_UCODE_DRV_GP1_SET, 502 CSR_UCODE_DRV_GP1_BIT_CMD_BLOCKED); 503 504 iwl_write_direct32(priv->trans, HBUS_TARG_MBX_C, 505 HBUS_TARG_MBX_C_REG_BIT_CMD_BLOCKED); 506 507 if (!(flags & RXON_CARD_DISABLED)) { 508 iwl_write32(priv->trans, CSR_UCODE_DRV_GP1_CLR, 509 CSR_UCODE_DRV_GP1_BIT_CMD_BLOCKED); 510 iwl_write_direct32(priv->trans, HBUS_TARG_MBX_C, 511 HBUS_TARG_MBX_C_REG_BIT_CMD_BLOCKED); 512 } 513 if (flags & CT_CARD_DISABLED) 514 iwl_tt_enter_ct_kill(priv); 515 } 516 if (!(flags & CT_CARD_DISABLED)) 517 iwl_tt_exit_ct_kill(priv); 518 519 if (flags & HW_CARD_DISABLED) 520 set_bit(STATUS_RF_KILL_HW, &priv->status); 521 else 522 clear_bit(STATUS_RF_KILL_HW, &priv->status); 523 524 525 if (!(flags & RXON_CARD_DISABLED)) 526 iwl_scan_cancel(priv); 527 528 if ((test_bit(STATUS_RF_KILL_HW, &status) != 529 test_bit(STATUS_RF_KILL_HW, &priv->status))) 530 wiphy_rfkill_set_hw_state(priv->hw->wiphy, 531 test_bit(STATUS_RF_KILL_HW, &priv->status)); 532 } 533 534 static void iwlagn_rx_missed_beacon_notif(struct iwl_priv *priv, 535 struct iwl_rx_cmd_buffer *rxb) 536 537 { 538 struct iwl_rx_packet *pkt = rxb_addr(rxb); 539 struct iwl_missed_beacon_notif *missed_beacon = (void *)pkt->data; 540 541 if (le32_to_cpu(missed_beacon->consecutive_missed_beacons) > 542 priv->missed_beacon_threshold) { 543 IWL_DEBUG_CALIB(priv, 544 "missed bcn cnsq %d totl %d rcd %d expctd %d\n", 545 le32_to_cpu(missed_beacon->consecutive_missed_beacons), 546 le32_to_cpu(missed_beacon->total_missed_becons), 547 le32_to_cpu(missed_beacon->num_recvd_beacons), 548 le32_to_cpu(missed_beacon->num_expected_beacons)); 549 if (!test_bit(STATUS_SCANNING, &priv->status)) 550 iwl_init_sensitivity(priv); 551 } 552 } 553 554 /* Cache phy data (Rx signal strength, etc) for HT frame (REPLY_RX_PHY_CMD). 555 * This will be used later in iwl_rx_reply_rx() for REPLY_RX_MPDU_CMD. */ 556 static void iwlagn_rx_reply_rx_phy(struct iwl_priv *priv, 557 struct iwl_rx_cmd_buffer *rxb) 558 { 559 struct iwl_rx_packet *pkt = rxb_addr(rxb); 560 561 priv->last_phy_res_valid = true; 562 priv->ampdu_ref++; 563 memcpy(&priv->last_phy_res, pkt->data, 564 sizeof(struct iwl_rx_phy_res)); 565 } 566 567 /* 568 * returns non-zero if packet should be dropped 569 */ 570 static int iwlagn_set_decrypted_flag(struct iwl_priv *priv, 571 struct ieee80211_hdr *hdr, 572 u32 decrypt_res, 573 struct ieee80211_rx_status *stats) 574 { 575 u16 fc = le16_to_cpu(hdr->frame_control); 576 577 /* 578 * All contexts have the same setting here due to it being 579 * a module parameter, so OK to check any context. 580 */ 581 if (priv->contexts[IWL_RXON_CTX_BSS].active.filter_flags & 582 RXON_FILTER_DIS_DECRYPT_MSK) 583 return 0; 584 585 if (!(fc & IEEE80211_FCTL_PROTECTED)) 586 return 0; 587 588 IWL_DEBUG_RX(priv, "decrypt_res:0x%x\n", decrypt_res); 589 switch (decrypt_res & RX_RES_STATUS_SEC_TYPE_MSK) { 590 case RX_RES_STATUS_SEC_TYPE_TKIP: 591 /* The uCode has got a bad phase 1 Key, pushes the packet. 592 * Decryption will be done in SW. */ 593 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) == 594 RX_RES_STATUS_BAD_KEY_TTAK) 595 break; 596 /* fall through */ 597 case RX_RES_STATUS_SEC_TYPE_WEP: 598 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) == 599 RX_RES_STATUS_BAD_ICV_MIC) { 600 /* bad ICV, the packet is destroyed since the 601 * decryption is inplace, drop it */ 602 IWL_DEBUG_RX(priv, "Packet destroyed\n"); 603 return -1; 604 } 605 /* fall through */ 606 case RX_RES_STATUS_SEC_TYPE_CCMP: 607 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) == 608 RX_RES_STATUS_DECRYPT_OK) { 609 IWL_DEBUG_RX(priv, "hw decrypt successfully!!!\n"); 610 stats->flag |= RX_FLAG_DECRYPTED; 611 } 612 break; 613 614 default: 615 break; 616 } 617 return 0; 618 } 619 620 static void iwlagn_pass_packet_to_mac80211(struct iwl_priv *priv, 621 struct ieee80211_hdr *hdr, 622 u16 len, 623 u32 ampdu_status, 624 struct iwl_rx_cmd_buffer *rxb, 625 struct ieee80211_rx_status *stats) 626 { 627 struct sk_buff *skb; 628 __le16 fc = hdr->frame_control; 629 struct iwl_rxon_context *ctx; 630 unsigned int hdrlen, fraglen; 631 632 /* We only process data packets if the interface is open */ 633 if (unlikely(!priv->is_open)) { 634 IWL_DEBUG_DROP_LIMIT(priv, 635 "Dropping packet while interface is not open.\n"); 636 return; 637 } 638 639 /* In case of HW accelerated crypto and bad decryption, drop */ 640 if (!iwlwifi_mod_params.swcrypto && 641 iwlagn_set_decrypted_flag(priv, hdr, ampdu_status, stats)) 642 return; 643 644 /* Dont use dev_alloc_skb(), we'll have enough headroom once 645 * ieee80211_hdr pulled. 646 */ 647 skb = alloc_skb(128, GFP_ATOMIC); 648 if (!skb) { 649 IWL_ERR(priv, "alloc_skb failed\n"); 650 return; 651 } 652 /* If frame is small enough to fit in skb->head, pull it completely. 653 * If not, only pull ieee80211_hdr so that splice() or TCP coalesce 654 * are more efficient. 655 */ 656 hdrlen = (len <= skb_tailroom(skb)) ? len : sizeof(*hdr); 657 658 skb_put_data(skb, hdr, hdrlen); 659 fraglen = len - hdrlen; 660 661 if (fraglen) { 662 int offset = (void *)hdr + hdrlen - 663 rxb_addr(rxb) + rxb_offset(rxb); 664 665 skb_add_rx_frag(skb, 0, rxb_steal_page(rxb), offset, 666 fraglen, rxb->truesize); 667 } 668 669 /* 670 * Wake any queues that were stopped due to a passive channel tx 671 * failure. This can happen because the regulatory enforcement in 672 * the device waits for a beacon before allowing transmission, 673 * sometimes even after already having transmitted frames for the 674 * association because the new RXON may reset the information. 675 */ 676 if (unlikely(ieee80211_is_beacon(fc) && priv->passive_no_rx)) { 677 for_each_context(priv, ctx) { 678 if (!ether_addr_equal(hdr->addr3, 679 ctx->active.bssid_addr)) 680 continue; 681 iwlagn_lift_passive_no_rx(priv); 682 } 683 } 684 685 memcpy(IEEE80211_SKB_RXCB(skb), stats, sizeof(*stats)); 686 687 ieee80211_rx_napi(priv->hw, NULL, skb, priv->napi); 688 } 689 690 static u32 iwlagn_translate_rx_status(struct iwl_priv *priv, u32 decrypt_in) 691 { 692 u32 decrypt_out = 0; 693 694 if ((decrypt_in & RX_RES_STATUS_STATION_FOUND) == 695 RX_RES_STATUS_STATION_FOUND) 696 decrypt_out |= (RX_RES_STATUS_STATION_FOUND | 697 RX_RES_STATUS_NO_STATION_INFO_MISMATCH); 698 699 decrypt_out |= (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK); 700 701 /* packet was not encrypted */ 702 if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) == 703 RX_RES_STATUS_SEC_TYPE_NONE) 704 return decrypt_out; 705 706 /* packet was encrypted with unknown alg */ 707 if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) == 708 RX_RES_STATUS_SEC_TYPE_ERR) 709 return decrypt_out; 710 711 /* decryption was not done in HW */ 712 if ((decrypt_in & RX_MPDU_RES_STATUS_DEC_DONE_MSK) != 713 RX_MPDU_RES_STATUS_DEC_DONE_MSK) 714 return decrypt_out; 715 716 switch (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) { 717 718 case RX_RES_STATUS_SEC_TYPE_CCMP: 719 /* alg is CCM: check MIC only */ 720 if (!(decrypt_in & RX_MPDU_RES_STATUS_MIC_OK)) 721 /* Bad MIC */ 722 decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC; 723 else 724 decrypt_out |= RX_RES_STATUS_DECRYPT_OK; 725 726 break; 727 728 case RX_RES_STATUS_SEC_TYPE_TKIP: 729 if (!(decrypt_in & RX_MPDU_RES_STATUS_TTAK_OK)) { 730 /* Bad TTAK */ 731 decrypt_out |= RX_RES_STATUS_BAD_KEY_TTAK; 732 break; 733 } 734 /* fall through */ 735 default: 736 if (!(decrypt_in & RX_MPDU_RES_STATUS_ICV_OK)) 737 decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC; 738 else 739 decrypt_out |= RX_RES_STATUS_DECRYPT_OK; 740 break; 741 } 742 743 IWL_DEBUG_RX(priv, "decrypt_in:0x%x decrypt_out = 0x%x\n", 744 decrypt_in, decrypt_out); 745 746 return decrypt_out; 747 } 748 749 /* Calc max signal level (dBm) among 3 possible receivers */ 750 static int iwlagn_calc_rssi(struct iwl_priv *priv, 751 struct iwl_rx_phy_res *rx_resp) 752 { 753 /* data from PHY/DSP regarding signal strength, etc., 754 * contents are always there, not configurable by host 755 */ 756 struct iwlagn_non_cfg_phy *ncphy = 757 (struct iwlagn_non_cfg_phy *)rx_resp->non_cfg_phy_buf; 758 u32 val, rssi_a, rssi_b, rssi_c, max_rssi; 759 u8 agc; 760 761 val = le32_to_cpu(ncphy->non_cfg_phy[IWLAGN_RX_RES_AGC_IDX]); 762 agc = (val & IWLAGN_OFDM_AGC_MSK) >> IWLAGN_OFDM_AGC_BIT_POS; 763 764 /* Find max rssi among 3 possible receivers. 765 * These values are measured by the digital signal processor (DSP). 766 * They should stay fairly constant even as the signal strength varies, 767 * if the radio's automatic gain control (AGC) is working right. 768 * AGC value (see below) will provide the "interesting" info. 769 */ 770 val = le32_to_cpu(ncphy->non_cfg_phy[IWLAGN_RX_RES_RSSI_AB_IDX]); 771 rssi_a = (val & IWLAGN_OFDM_RSSI_INBAND_A_BITMSK) >> 772 IWLAGN_OFDM_RSSI_A_BIT_POS; 773 rssi_b = (val & IWLAGN_OFDM_RSSI_INBAND_B_BITMSK) >> 774 IWLAGN_OFDM_RSSI_B_BIT_POS; 775 val = le32_to_cpu(ncphy->non_cfg_phy[IWLAGN_RX_RES_RSSI_C_IDX]); 776 rssi_c = (val & IWLAGN_OFDM_RSSI_INBAND_C_BITMSK) >> 777 IWLAGN_OFDM_RSSI_C_BIT_POS; 778 779 max_rssi = max_t(u32, rssi_a, rssi_b); 780 max_rssi = max_t(u32, max_rssi, rssi_c); 781 782 IWL_DEBUG_STATS(priv, "Rssi In A %d B %d C %d Max %d AGC dB %d\n", 783 rssi_a, rssi_b, rssi_c, max_rssi, agc); 784 785 /* dBm = max_rssi dB - agc dB - constant. 786 * Higher AGC (higher radio gain) means lower signal. */ 787 return max_rssi - agc - IWLAGN_RSSI_OFFSET; 788 } 789 790 /* Called for REPLY_RX_MPDU_CMD */ 791 static void iwlagn_rx_reply_rx(struct iwl_priv *priv, 792 struct iwl_rx_cmd_buffer *rxb) 793 { 794 struct ieee80211_hdr *header; 795 struct ieee80211_rx_status rx_status = {}; 796 struct iwl_rx_packet *pkt = rxb_addr(rxb); 797 struct iwl_rx_phy_res *phy_res; 798 __le32 rx_pkt_status; 799 struct iwl_rx_mpdu_res_start *amsdu; 800 u32 len; 801 u32 ampdu_status; 802 u32 rate_n_flags; 803 804 if (!priv->last_phy_res_valid) { 805 IWL_ERR(priv, "MPDU frame without cached PHY data\n"); 806 return; 807 } 808 phy_res = &priv->last_phy_res; 809 amsdu = (struct iwl_rx_mpdu_res_start *)pkt->data; 810 header = (struct ieee80211_hdr *)(pkt->data + sizeof(*amsdu)); 811 len = le16_to_cpu(amsdu->byte_count); 812 rx_pkt_status = *(__le32 *)(pkt->data + sizeof(*amsdu) + len); 813 ampdu_status = iwlagn_translate_rx_status(priv, 814 le32_to_cpu(rx_pkt_status)); 815 816 if ((unlikely(phy_res->cfg_phy_cnt > 20))) { 817 IWL_DEBUG_DROP(priv, "dsp size out of range [0,20]: %d\n", 818 phy_res->cfg_phy_cnt); 819 return; 820 } 821 822 if (!(rx_pkt_status & RX_RES_STATUS_NO_CRC32_ERROR) || 823 !(rx_pkt_status & RX_RES_STATUS_NO_RXE_OVERFLOW)) { 824 IWL_DEBUG_RX(priv, "Bad CRC or FIFO: 0x%08X.\n", 825 le32_to_cpu(rx_pkt_status)); 826 return; 827 } 828 829 /* This will be used in several places later */ 830 rate_n_flags = le32_to_cpu(phy_res->rate_n_flags); 831 832 /* rx_status carries information about the packet to mac80211 */ 833 rx_status.mactime = le64_to_cpu(phy_res->timestamp); 834 rx_status.band = (phy_res->phy_flags & RX_RES_PHY_FLAGS_BAND_24_MSK) ? 835 NL80211_BAND_2GHZ : NL80211_BAND_5GHZ; 836 rx_status.freq = 837 ieee80211_channel_to_frequency(le16_to_cpu(phy_res->channel), 838 rx_status.band); 839 rx_status.rate_idx = 840 iwlagn_hwrate_to_mac80211_idx(rate_n_flags, rx_status.band); 841 rx_status.flag = 0; 842 843 /* TSF isn't reliable. In order to allow smooth user experience, 844 * this W/A doesn't propagate it to the mac80211 */ 845 /*rx_status.flag |= RX_FLAG_MACTIME_START;*/ 846 847 priv->ucode_beacon_time = le32_to_cpu(phy_res->beacon_time_stamp); 848 849 /* Find max signal strength (dBm) among 3 antenna/receiver chains */ 850 rx_status.signal = iwlagn_calc_rssi(priv, phy_res); 851 852 IWL_DEBUG_STATS_LIMIT(priv, "Rssi %d, TSF %llu\n", 853 rx_status.signal, (unsigned long long)rx_status.mactime); 854 855 /* 856 * "antenna number" 857 * 858 * It seems that the antenna field in the phy flags value 859 * is actually a bit field. This is undefined by radiotap, 860 * it wants an actual antenna number but I always get "7" 861 * for most legacy frames I receive indicating that the 862 * same frame was received on all three RX chains. 863 * 864 * I think this field should be removed in favor of a 865 * new 802.11n radiotap field "RX chains" that is defined 866 * as a bitmask. 867 */ 868 rx_status.antenna = 869 (le16_to_cpu(phy_res->phy_flags) & RX_RES_PHY_FLAGS_ANTENNA_MSK) 870 >> RX_RES_PHY_FLAGS_ANTENNA_POS; 871 872 /* set the preamble flag if appropriate */ 873 if (phy_res->phy_flags & RX_RES_PHY_FLAGS_SHORT_PREAMBLE_MSK) 874 rx_status.enc_flags |= RX_ENC_FLAG_SHORTPRE; 875 876 if (phy_res->phy_flags & RX_RES_PHY_FLAGS_AGG_MSK) { 877 /* 878 * We know which subframes of an A-MPDU belong 879 * together since we get a single PHY response 880 * from the firmware for all of them 881 */ 882 rx_status.flag |= RX_FLAG_AMPDU_DETAILS; 883 rx_status.ampdu_reference = priv->ampdu_ref; 884 } 885 886 /* Set up the HT phy flags */ 887 if (rate_n_flags & RATE_MCS_HT_MSK) 888 rx_status.encoding = RX_ENC_HT; 889 if (rate_n_flags & RATE_MCS_HT40_MSK) 890 rx_status.bw = RATE_INFO_BW_40; 891 else 892 rx_status.bw = RATE_INFO_BW_20; 893 if (rate_n_flags & RATE_MCS_SGI_MSK) 894 rx_status.enc_flags |= RX_ENC_FLAG_SHORT_GI; 895 if (rate_n_flags & RATE_MCS_GF_MSK) 896 rx_status.enc_flags |= RX_ENC_FLAG_HT_GF; 897 898 iwlagn_pass_packet_to_mac80211(priv, header, len, ampdu_status, 899 rxb, &rx_status); 900 } 901 902 static void iwlagn_rx_noa_notification(struct iwl_priv *priv, 903 struct iwl_rx_cmd_buffer *rxb) 904 { 905 struct iwl_wipan_noa_data *new_data, *old_data; 906 struct iwl_rx_packet *pkt = rxb_addr(rxb); 907 struct iwl_wipan_noa_notification *noa_notif = (void *)pkt->data; 908 909 /* no condition -- we're in softirq */ 910 old_data = rcu_dereference_protected(priv->noa_data, true); 911 912 if (noa_notif->noa_active) { 913 u32 len = le16_to_cpu(noa_notif->noa_attribute.length); 914 u32 copylen = len; 915 916 /* EID, len, OUI, subtype */ 917 len += 1 + 1 + 3 + 1; 918 /* P2P id, P2P length */ 919 len += 1 + 2; 920 copylen += 1 + 2; 921 922 new_data = kmalloc(sizeof(*new_data) + len, GFP_ATOMIC); 923 if (new_data) { 924 new_data->length = len; 925 new_data->data[0] = WLAN_EID_VENDOR_SPECIFIC; 926 new_data->data[1] = len - 2; /* not counting EID, len */ 927 new_data->data[2] = (WLAN_OUI_WFA >> 16) & 0xff; 928 new_data->data[3] = (WLAN_OUI_WFA >> 8) & 0xff; 929 new_data->data[4] = (WLAN_OUI_WFA >> 0) & 0xff; 930 new_data->data[5] = WLAN_OUI_TYPE_WFA_P2P; 931 memcpy(&new_data->data[6], &noa_notif->noa_attribute, 932 copylen); 933 } 934 } else 935 new_data = NULL; 936 937 rcu_assign_pointer(priv->noa_data, new_data); 938 939 if (old_data) 940 kfree_rcu(old_data, rcu_head); 941 } 942 943 /** 944 * iwl_setup_rx_handlers - Initialize Rx handler callbacks 945 * 946 * Setup the RX handlers for each of the reply types sent from the uCode 947 * to the host. 948 */ 949 void iwl_setup_rx_handlers(struct iwl_priv *priv) 950 { 951 void (**handlers)(struct iwl_priv *priv, struct iwl_rx_cmd_buffer *rxb); 952 953 handlers = priv->rx_handlers; 954 955 handlers[REPLY_ERROR] = iwlagn_rx_reply_error; 956 handlers[CHANNEL_SWITCH_NOTIFICATION] = iwlagn_rx_csa; 957 handlers[SPECTRUM_MEASURE_NOTIFICATION] = 958 iwlagn_rx_spectrum_measure_notif; 959 handlers[PM_SLEEP_NOTIFICATION] = iwlagn_rx_pm_sleep_notif; 960 handlers[PM_DEBUG_STATISTIC_NOTIFIC] = 961 iwlagn_rx_pm_debug_statistics_notif; 962 handlers[BEACON_NOTIFICATION] = iwlagn_rx_beacon_notif; 963 handlers[REPLY_ADD_STA] = iwl_add_sta_callback; 964 965 handlers[REPLY_WIPAN_NOA_NOTIFICATION] = iwlagn_rx_noa_notification; 966 967 /* 968 * The same handler is used for both the REPLY to a discrete 969 * statistics request from the host as well as for the periodic 970 * statistics notifications (after received beacons) from the uCode. 971 */ 972 handlers[REPLY_STATISTICS_CMD] = iwlagn_rx_reply_statistics; 973 handlers[STATISTICS_NOTIFICATION] = iwlagn_rx_statistics; 974 975 iwl_setup_rx_scan_handlers(priv); 976 977 handlers[CARD_STATE_NOTIFICATION] = iwlagn_rx_card_state_notif; 978 handlers[MISSED_BEACONS_NOTIFICATION] = 979 iwlagn_rx_missed_beacon_notif; 980 981 /* Rx handlers */ 982 handlers[REPLY_RX_PHY_CMD] = iwlagn_rx_reply_rx_phy; 983 handlers[REPLY_RX_MPDU_CMD] = iwlagn_rx_reply_rx; 984 985 /* block ack */ 986 handlers[REPLY_COMPRESSED_BA] = 987 iwlagn_rx_reply_compressed_ba; 988 989 priv->rx_handlers[REPLY_TX] = iwlagn_rx_reply_tx; 990 991 /* set up notification wait support */ 992 iwl_notification_wait_init(&priv->notif_wait); 993 994 /* Set up BT Rx handlers */ 995 if (priv->lib->bt_params) 996 iwlagn_bt_rx_handler_setup(priv); 997 } 998 999 void iwl_rx_dispatch(struct iwl_op_mode *op_mode, struct napi_struct *napi, 1000 struct iwl_rx_cmd_buffer *rxb) 1001 { 1002 struct iwl_rx_packet *pkt = rxb_addr(rxb); 1003 struct iwl_priv *priv = IWL_OP_MODE_GET_DVM(op_mode); 1004 1005 /* 1006 * Do the notification wait before RX handlers so 1007 * even if the RX handler consumes the RXB we have 1008 * access to it in the notification wait entry. 1009 */ 1010 iwl_notification_wait_notify(&priv->notif_wait, pkt); 1011 1012 /* Based on type of command response or notification, 1013 * handle those that need handling via function in 1014 * rx_handlers table. See iwl_setup_rx_handlers() */ 1015 if (priv->rx_handlers[pkt->hdr.cmd]) { 1016 priv->rx_handlers_stats[pkt->hdr.cmd]++; 1017 priv->rx_handlers[pkt->hdr.cmd](priv, rxb); 1018 } else { 1019 /* No handling needed */ 1020 IWL_DEBUG_RX(priv, "No handler needed for %s, 0x%02x\n", 1021 iwl_get_cmd_string(priv->trans, 1022 iwl_cmd_id(pkt->hdr.cmd, 1023 0, 0)), 1024 pkt->hdr.cmd); 1025 } 1026 } 1027