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