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 * You should have received a copy of the GNU General Public License along with 19 * this program; if not, write to the Free Software Foundation, Inc., 20 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA 21 * 22 * The full GNU General Public License is included in this distribution in the 23 * file called LICENSE. 24 * 25 * Contact Information: 26 * Intel Linux Wireless <linuxwifi@intel.com> 27 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 28 * 29 *****************************************************************************/ 30 31 #include <linux/etherdevice.h> 32 #include <linux/slab.h> 33 #include <linux/sched.h> 34 #include <net/mac80211.h> 35 #include <asm/unaligned.h> 36 37 #include "iwl-trans.h" 38 #include "iwl-io.h" 39 #include "dev.h" 40 #include "calib.h" 41 #include "agn.h" 42 43 /****************************************************************************** 44 * 45 * Generic RX handler implementations 46 * 47 ******************************************************************************/ 48 49 static void iwlagn_rx_reply_error(struct iwl_priv *priv, 50 struct iwl_rx_cmd_buffer *rxb) 51 { 52 struct iwl_rx_packet *pkt = rxb_addr(rxb); 53 struct iwl_error_resp *err_resp = (void *)pkt->data; 54 55 IWL_ERR(priv, "Error Reply type 0x%08X cmd REPLY_ERROR (0x%02X) " 56 "seq 0x%04X ser 0x%08X\n", 57 le32_to_cpu(err_resp->error_type), 58 err_resp->cmd_id, 59 le16_to_cpu(err_resp->bad_cmd_seq_num), 60 le32_to_cpu(err_resp->error_info)); 61 } 62 63 static void iwlagn_rx_csa(struct iwl_priv *priv, struct iwl_rx_cmd_buffer *rxb) 64 { 65 struct iwl_rx_packet *pkt = rxb_addr(rxb); 66 struct iwl_csa_notification *csa = (void *)pkt->data; 67 /* 68 * MULTI-FIXME 69 * See iwlagn_mac_channel_switch. 70 */ 71 struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS]; 72 struct iwl_rxon_cmd *rxon = (void *)&ctx->active; 73 74 if (!test_bit(STATUS_CHANNEL_SWITCH_PENDING, &priv->status)) 75 return; 76 77 if (!le32_to_cpu(csa->status) && csa->channel == priv->switch_channel) { 78 rxon->channel = csa->channel; 79 ctx->staging.channel = csa->channel; 80 IWL_DEBUG_11H(priv, "CSA notif: channel %d\n", 81 le16_to_cpu(csa->channel)); 82 iwl_chswitch_done(priv, true); 83 } else { 84 IWL_ERR(priv, "CSA notif (fail) : channel %d\n", 85 le16_to_cpu(csa->channel)); 86 iwl_chswitch_done(priv, false); 87 } 88 } 89 90 91 static void iwlagn_rx_spectrum_measure_notif(struct iwl_priv *priv, 92 struct iwl_rx_cmd_buffer *rxb) 93 { 94 struct iwl_rx_packet *pkt = rxb_addr(rxb); 95 struct iwl_spectrum_notification *report = (void *)pkt->data; 96 97 if (!report->state) { 98 IWL_DEBUG_11H(priv, 99 "Spectrum Measure Notification: Start\n"); 100 return; 101 } 102 103 memcpy(&priv->measure_report, report, sizeof(*report)); 104 priv->measurement_status |= MEASUREMENT_READY; 105 } 106 107 static void iwlagn_rx_pm_sleep_notif(struct iwl_priv *priv, 108 struct iwl_rx_cmd_buffer *rxb) 109 { 110 #ifdef CONFIG_IWLWIFI_DEBUG 111 struct iwl_rx_packet *pkt = rxb_addr(rxb); 112 struct iwl_sleep_notification *sleep = (void *)pkt->data; 113 IWL_DEBUG_RX(priv, "sleep mode: %d, src: %d\n", 114 sleep->pm_sleep_mode, sleep->pm_wakeup_src); 115 #endif 116 } 117 118 static void iwlagn_rx_pm_debug_statistics_notif(struct iwl_priv *priv, 119 struct iwl_rx_cmd_buffer *rxb) 120 { 121 struct iwl_rx_packet *pkt = rxb_addr(rxb); 122 u32 __maybe_unused len = iwl_rx_packet_len(pkt); 123 IWL_DEBUG_RADIO(priv, "Dumping %d bytes of unhandled " 124 "notification for PM_DEBUG_STATISTIC_NOTIFIC:\n", len); 125 iwl_print_hex_dump(priv, IWL_DL_RADIO, pkt->data, len); 126 } 127 128 static void iwlagn_rx_beacon_notif(struct iwl_priv *priv, 129 struct iwl_rx_cmd_buffer *rxb) 130 { 131 struct iwl_rx_packet *pkt = rxb_addr(rxb); 132 struct iwlagn_beacon_notif *beacon = (void *)pkt->data; 133 #ifdef CONFIG_IWLWIFI_DEBUG 134 u16 status = le16_to_cpu(beacon->beacon_notify_hdr.status.status); 135 u8 rate = iwl_hw_get_rate(beacon->beacon_notify_hdr.rate_n_flags); 136 137 IWL_DEBUG_RX(priv, "beacon status %#x, retries:%d ibssmgr:%d " 138 "tsf:0x%.8x%.8x rate:%d\n", 139 status & TX_STATUS_MSK, 140 beacon->beacon_notify_hdr.failure_frame, 141 le32_to_cpu(beacon->ibss_mgr_status), 142 le32_to_cpu(beacon->high_tsf), 143 le32_to_cpu(beacon->low_tsf), rate); 144 #endif 145 146 priv->ibss_manager = le32_to_cpu(beacon->ibss_mgr_status); 147 } 148 149 /** 150 * iwl_good_plcp_health - checks for plcp error. 151 * 152 * When the plcp error is exceeding the thresholds, reset the radio 153 * to improve the throughput. 154 */ 155 static bool iwlagn_good_plcp_health(struct iwl_priv *priv, 156 struct statistics_rx_phy *cur_ofdm, 157 struct statistics_rx_ht_phy *cur_ofdm_ht, 158 unsigned int msecs) 159 { 160 int delta; 161 int threshold = priv->plcp_delta_threshold; 162 163 if (threshold == IWL_MAX_PLCP_ERR_THRESHOLD_DISABLE) { 164 IWL_DEBUG_RADIO(priv, "plcp_err check disabled\n"); 165 return true; 166 } 167 168 delta = le32_to_cpu(cur_ofdm->plcp_err) - 169 le32_to_cpu(priv->statistics.rx_ofdm.plcp_err) + 170 le32_to_cpu(cur_ofdm_ht->plcp_err) - 171 le32_to_cpu(priv->statistics.rx_ofdm_ht.plcp_err); 172 173 /* Can be negative if firmware reset statistics */ 174 if (delta <= 0) 175 return true; 176 177 if ((delta * 100 / msecs) > threshold) { 178 IWL_DEBUG_RADIO(priv, 179 "plcp health threshold %u delta %d msecs %u\n", 180 threshold, delta, msecs); 181 return false; 182 } 183 184 return true; 185 } 186 187 int iwl_force_rf_reset(struct iwl_priv *priv, bool external) 188 { 189 struct iwl_rf_reset *rf_reset; 190 191 if (test_bit(STATUS_EXIT_PENDING, &priv->status)) 192 return -EAGAIN; 193 194 if (!iwl_is_any_associated(priv)) { 195 IWL_DEBUG_SCAN(priv, "force reset rejected: not associated\n"); 196 return -ENOLINK; 197 } 198 199 rf_reset = &priv->rf_reset; 200 rf_reset->reset_request_count++; 201 if (!external && rf_reset->last_reset_jiffies && 202 time_after(rf_reset->last_reset_jiffies + 203 IWL_DELAY_NEXT_FORCE_RF_RESET, jiffies)) { 204 IWL_DEBUG_INFO(priv, "RF reset rejected\n"); 205 rf_reset->reset_reject_count++; 206 return -EAGAIN; 207 } 208 rf_reset->reset_success_count++; 209 rf_reset->last_reset_jiffies = jiffies; 210 211 /* 212 * There is no easy and better way to force reset the radio, 213 * the only known method is switching channel which will force to 214 * reset and tune the radio. 215 * Use internal short scan (single channel) operation to should 216 * achieve this objective. 217 * Driver should reset the radio when number of consecutive missed 218 * beacon, or any other uCode error condition detected. 219 */ 220 IWL_DEBUG_INFO(priv, "perform radio reset.\n"); 221 iwl_internal_short_hw_scan(priv); 222 return 0; 223 } 224 225 226 static void iwlagn_recover_from_statistics(struct iwl_priv *priv, 227 struct statistics_rx_phy *cur_ofdm, 228 struct statistics_rx_ht_phy *cur_ofdm_ht, 229 struct statistics_tx *tx, 230 unsigned long stamp) 231 { 232 unsigned int msecs; 233 234 if (test_bit(STATUS_EXIT_PENDING, &priv->status)) 235 return; 236 237 msecs = jiffies_to_msecs(stamp - priv->rx_statistics_jiffies); 238 239 /* Only gather statistics and update time stamp when not associated */ 240 if (!iwl_is_any_associated(priv)) 241 return; 242 243 /* Do not check/recover when do not have enough statistics data */ 244 if (msecs < 99) 245 return; 246 247 if (!iwlagn_good_plcp_health(priv, cur_ofdm, cur_ofdm_ht, msecs)) 248 iwl_force_rf_reset(priv, false); 249 } 250 251 /* Calculate noise level, based on measurements during network silence just 252 * before arriving beacon. This measurement can be done only if we know 253 * exactly when to expect beacons, therefore only when we're associated. */ 254 static void iwlagn_rx_calc_noise(struct iwl_priv *priv) 255 { 256 struct statistics_rx_non_phy *rx_info; 257 int num_active_rx = 0; 258 int total_silence = 0; 259 int bcn_silence_a, bcn_silence_b, bcn_silence_c; 260 int last_rx_noise; 261 262 rx_info = &priv->statistics.rx_non_phy; 263 264 bcn_silence_a = 265 le32_to_cpu(rx_info->beacon_silence_rssi_a) & IN_BAND_FILTER; 266 bcn_silence_b = 267 le32_to_cpu(rx_info->beacon_silence_rssi_b) & IN_BAND_FILTER; 268 bcn_silence_c = 269 le32_to_cpu(rx_info->beacon_silence_rssi_c) & IN_BAND_FILTER; 270 271 if (bcn_silence_a) { 272 total_silence += bcn_silence_a; 273 num_active_rx++; 274 } 275 if (bcn_silence_b) { 276 total_silence += bcn_silence_b; 277 num_active_rx++; 278 } 279 if (bcn_silence_c) { 280 total_silence += bcn_silence_c; 281 num_active_rx++; 282 } 283 284 /* Average among active antennas */ 285 if (num_active_rx) 286 last_rx_noise = (total_silence / num_active_rx) - 107; 287 else 288 last_rx_noise = IWL_NOISE_MEAS_NOT_AVAILABLE; 289 290 IWL_DEBUG_CALIB(priv, "inband silence a %u, b %u, c %u, dBm %d\n", 291 bcn_silence_a, bcn_silence_b, bcn_silence_c, 292 last_rx_noise); 293 } 294 295 #ifdef CONFIG_IWLWIFI_DEBUGFS 296 /* 297 * based on the assumption of all statistics counter are in DWORD 298 * FIXME: This function is for debugging, do not deal with 299 * the case of counters roll-over. 300 */ 301 static void accum_stats(__le32 *prev, __le32 *cur, __le32 *delta, 302 __le32 *max_delta, __le32 *accum, int size) 303 { 304 int i; 305 306 for (i = 0; 307 i < size / sizeof(__le32); 308 i++, prev++, cur++, delta++, max_delta++, accum++) { 309 if (le32_to_cpu(*cur) > le32_to_cpu(*prev)) { 310 *delta = cpu_to_le32( 311 le32_to_cpu(*cur) - le32_to_cpu(*prev)); 312 le32_add_cpu(accum, le32_to_cpu(*delta)); 313 if (le32_to_cpu(*delta) > le32_to_cpu(*max_delta)) 314 *max_delta = *delta; 315 } 316 } 317 } 318 319 static void 320 iwlagn_accumulative_statistics(struct iwl_priv *priv, 321 struct statistics_general_common *common, 322 struct statistics_rx_non_phy *rx_non_phy, 323 struct statistics_rx_phy *rx_ofdm, 324 struct statistics_rx_ht_phy *rx_ofdm_ht, 325 struct statistics_rx_phy *rx_cck, 326 struct statistics_tx *tx, 327 struct statistics_bt_activity *bt_activity) 328 { 329 #define ACCUM(_name) \ 330 accum_stats((__le32 *)&priv->statistics._name, \ 331 (__le32 *)_name, \ 332 (__le32 *)&priv->delta_stats._name, \ 333 (__le32 *)&priv->max_delta_stats._name, \ 334 (__le32 *)&priv->accum_stats._name, \ 335 sizeof(*_name)); 336 337 ACCUM(common); 338 ACCUM(rx_non_phy); 339 ACCUM(rx_ofdm); 340 ACCUM(rx_ofdm_ht); 341 ACCUM(rx_cck); 342 ACCUM(tx); 343 if (bt_activity) 344 ACCUM(bt_activity); 345 #undef ACCUM 346 } 347 #else 348 static inline void 349 iwlagn_accumulative_statistics(struct iwl_priv *priv, 350 struct statistics_general_common *common, 351 struct statistics_rx_non_phy *rx_non_phy, 352 struct statistics_rx_phy *rx_ofdm, 353 struct statistics_rx_ht_phy *rx_ofdm_ht, 354 struct statistics_rx_phy *rx_cck, 355 struct statistics_tx *tx, 356 struct statistics_bt_activity *bt_activity) 357 { 358 } 359 #endif 360 361 static void iwlagn_rx_statistics(struct iwl_priv *priv, 362 struct iwl_rx_cmd_buffer *rxb) 363 { 364 unsigned long stamp = jiffies; 365 const int reg_recalib_period = 60; 366 int change; 367 struct iwl_rx_packet *pkt = rxb_addr(rxb); 368 u32 len = iwl_rx_packet_payload_len(pkt); 369 __le32 *flag; 370 struct statistics_general_common *common; 371 struct statistics_rx_non_phy *rx_non_phy; 372 struct statistics_rx_phy *rx_ofdm; 373 struct statistics_rx_ht_phy *rx_ofdm_ht; 374 struct statistics_rx_phy *rx_cck; 375 struct statistics_tx *tx; 376 struct statistics_bt_activity *bt_activity; 377 378 IWL_DEBUG_RX(priv, "Statistics notification received (%d bytes).\n", 379 len); 380 381 spin_lock(&priv->statistics.lock); 382 383 if (len == sizeof(struct iwl_bt_notif_statistics)) { 384 struct iwl_bt_notif_statistics *stats; 385 stats = (void *)&pkt->data; 386 flag = &stats->flag; 387 common = &stats->general.common; 388 rx_non_phy = &stats->rx.general.common; 389 rx_ofdm = &stats->rx.ofdm; 390 rx_ofdm_ht = &stats->rx.ofdm_ht; 391 rx_cck = &stats->rx.cck; 392 tx = &stats->tx; 393 bt_activity = &stats->general.activity; 394 395 #ifdef CONFIG_IWLWIFI_DEBUGFS 396 /* handle this exception directly */ 397 priv->statistics.num_bt_kills = stats->rx.general.num_bt_kills; 398 le32_add_cpu(&priv->statistics.accum_num_bt_kills, 399 le32_to_cpu(stats->rx.general.num_bt_kills)); 400 #endif 401 } else if (len == sizeof(struct iwl_notif_statistics)) { 402 struct iwl_notif_statistics *stats; 403 stats = (void *)&pkt->data; 404 flag = &stats->flag; 405 common = &stats->general.common; 406 rx_non_phy = &stats->rx.general; 407 rx_ofdm = &stats->rx.ofdm; 408 rx_ofdm_ht = &stats->rx.ofdm_ht; 409 rx_cck = &stats->rx.cck; 410 tx = &stats->tx; 411 bt_activity = NULL; 412 } else { 413 WARN_ONCE(1, "len %d doesn't match BT (%zu) or normal (%zu)\n", 414 len, sizeof(struct iwl_bt_notif_statistics), 415 sizeof(struct iwl_notif_statistics)); 416 spin_unlock(&priv->statistics.lock); 417 return; 418 } 419 420 change = common->temperature != priv->statistics.common.temperature || 421 (*flag & STATISTICS_REPLY_FLG_HT40_MODE_MSK) != 422 (priv->statistics.flag & STATISTICS_REPLY_FLG_HT40_MODE_MSK); 423 424 iwlagn_accumulative_statistics(priv, common, rx_non_phy, rx_ofdm, 425 rx_ofdm_ht, rx_cck, tx, bt_activity); 426 427 iwlagn_recover_from_statistics(priv, rx_ofdm, rx_ofdm_ht, tx, stamp); 428 429 priv->statistics.flag = *flag; 430 memcpy(&priv->statistics.common, common, sizeof(*common)); 431 memcpy(&priv->statistics.rx_non_phy, rx_non_phy, sizeof(*rx_non_phy)); 432 memcpy(&priv->statistics.rx_ofdm, rx_ofdm, sizeof(*rx_ofdm)); 433 memcpy(&priv->statistics.rx_ofdm_ht, rx_ofdm_ht, sizeof(*rx_ofdm_ht)); 434 memcpy(&priv->statistics.rx_cck, rx_cck, sizeof(*rx_cck)); 435 memcpy(&priv->statistics.tx, tx, sizeof(*tx)); 436 #ifdef CONFIG_IWLWIFI_DEBUGFS 437 if (bt_activity) 438 memcpy(&priv->statistics.bt_activity, bt_activity, 439 sizeof(*bt_activity)); 440 #endif 441 442 priv->rx_statistics_jiffies = stamp; 443 444 set_bit(STATUS_STATISTICS, &priv->status); 445 446 /* Reschedule the statistics timer to occur in 447 * reg_recalib_period seconds to ensure we get a 448 * thermal update even if the uCode doesn't give 449 * us one */ 450 mod_timer(&priv->statistics_periodic, jiffies + 451 msecs_to_jiffies(reg_recalib_period * 1000)); 452 453 if (unlikely(!test_bit(STATUS_SCANNING, &priv->status)) && 454 (pkt->hdr.cmd == STATISTICS_NOTIFICATION)) { 455 iwlagn_rx_calc_noise(priv); 456 queue_work(priv->workqueue, &priv->run_time_calib_work); 457 } 458 if (priv->lib->temperature && change) 459 priv->lib->temperature(priv); 460 461 spin_unlock(&priv->statistics.lock); 462 } 463 464 static void iwlagn_rx_reply_statistics(struct iwl_priv *priv, 465 struct iwl_rx_cmd_buffer *rxb) 466 { 467 struct iwl_rx_packet *pkt = rxb_addr(rxb); 468 struct iwl_notif_statistics *stats = (void *)pkt->data; 469 470 if (le32_to_cpu(stats->flag) & UCODE_STATISTICS_CLEAR_MSK) { 471 #ifdef CONFIG_IWLWIFI_DEBUGFS 472 memset(&priv->accum_stats, 0, 473 sizeof(priv->accum_stats)); 474 memset(&priv->delta_stats, 0, 475 sizeof(priv->delta_stats)); 476 memset(&priv->max_delta_stats, 0, 477 sizeof(priv->max_delta_stats)); 478 #endif 479 IWL_DEBUG_RX(priv, "Statistics have been cleared\n"); 480 } 481 482 iwlagn_rx_statistics(priv, rxb); 483 } 484 485 /* Handle notification from uCode that card's power state is changing 486 * due to software, hardware, or critical temperature RFKILL */ 487 static void iwlagn_rx_card_state_notif(struct iwl_priv *priv, 488 struct iwl_rx_cmd_buffer *rxb) 489 { 490 struct iwl_rx_packet *pkt = rxb_addr(rxb); 491 struct iwl_card_state_notif *card_state_notif = (void *)pkt->data; 492 u32 flags = le32_to_cpu(card_state_notif->flags); 493 unsigned long status = priv->status; 494 495 IWL_DEBUG_RF_KILL(priv, "Card state received: HW:%s SW:%s CT:%s\n", 496 (flags & HW_CARD_DISABLED) ? "Kill" : "On", 497 (flags & SW_CARD_DISABLED) ? "Kill" : "On", 498 (flags & CT_CARD_DISABLED) ? 499 "Reached" : "Not reached"); 500 501 if (flags & (SW_CARD_DISABLED | HW_CARD_DISABLED | 502 CT_CARD_DISABLED)) { 503 504 iwl_write32(priv->trans, CSR_UCODE_DRV_GP1_SET, 505 CSR_UCODE_DRV_GP1_BIT_CMD_BLOCKED); 506 507 iwl_write_direct32(priv->trans, HBUS_TARG_MBX_C, 508 HBUS_TARG_MBX_C_REG_BIT_CMD_BLOCKED); 509 510 if (!(flags & RXON_CARD_DISABLED)) { 511 iwl_write32(priv->trans, CSR_UCODE_DRV_GP1_CLR, 512 CSR_UCODE_DRV_GP1_BIT_CMD_BLOCKED); 513 iwl_write_direct32(priv->trans, HBUS_TARG_MBX_C, 514 HBUS_TARG_MBX_C_REG_BIT_CMD_BLOCKED); 515 } 516 if (flags & CT_CARD_DISABLED) 517 iwl_tt_enter_ct_kill(priv); 518 } 519 if (!(flags & CT_CARD_DISABLED)) 520 iwl_tt_exit_ct_kill(priv); 521 522 if (flags & HW_CARD_DISABLED) 523 set_bit(STATUS_RF_KILL_HW, &priv->status); 524 else 525 clear_bit(STATUS_RF_KILL_HW, &priv->status); 526 527 528 if (!(flags & RXON_CARD_DISABLED)) 529 iwl_scan_cancel(priv); 530 531 if ((test_bit(STATUS_RF_KILL_HW, &status) != 532 test_bit(STATUS_RF_KILL_HW, &priv->status))) 533 wiphy_rfkill_set_hw_state(priv->hw->wiphy, 534 test_bit(STATUS_RF_KILL_HW, &priv->status)); 535 } 536 537 static void iwlagn_rx_missed_beacon_notif(struct iwl_priv *priv, 538 struct iwl_rx_cmd_buffer *rxb) 539 540 { 541 struct iwl_rx_packet *pkt = rxb_addr(rxb); 542 struct iwl_missed_beacon_notif *missed_beacon = (void *)pkt->data; 543 544 if (le32_to_cpu(missed_beacon->consecutive_missed_beacons) > 545 priv->missed_beacon_threshold) { 546 IWL_DEBUG_CALIB(priv, 547 "missed bcn cnsq %d totl %d rcd %d expctd %d\n", 548 le32_to_cpu(missed_beacon->consecutive_missed_beacons), 549 le32_to_cpu(missed_beacon->total_missed_becons), 550 le32_to_cpu(missed_beacon->num_recvd_beacons), 551 le32_to_cpu(missed_beacon->num_expected_beacons)); 552 if (!test_bit(STATUS_SCANNING, &priv->status)) 553 iwl_init_sensitivity(priv); 554 } 555 } 556 557 /* Cache phy data (Rx signal strength, etc) for HT frame (REPLY_RX_PHY_CMD). 558 * This will be used later in iwl_rx_reply_rx() for REPLY_RX_MPDU_CMD. */ 559 static void iwlagn_rx_reply_rx_phy(struct iwl_priv *priv, 560 struct iwl_rx_cmd_buffer *rxb) 561 { 562 struct iwl_rx_packet *pkt = rxb_addr(rxb); 563 564 priv->last_phy_res_valid = true; 565 priv->ampdu_ref++; 566 memcpy(&priv->last_phy_res, pkt->data, 567 sizeof(struct iwl_rx_phy_res)); 568 } 569 570 /* 571 * returns non-zero if packet should be dropped 572 */ 573 static int iwlagn_set_decrypted_flag(struct iwl_priv *priv, 574 struct ieee80211_hdr *hdr, 575 u32 decrypt_res, 576 struct ieee80211_rx_status *stats) 577 { 578 u16 fc = le16_to_cpu(hdr->frame_control); 579 580 /* 581 * All contexts have the same setting here due to it being 582 * a module parameter, so OK to check any context. 583 */ 584 if (priv->contexts[IWL_RXON_CTX_BSS].active.filter_flags & 585 RXON_FILTER_DIS_DECRYPT_MSK) 586 return 0; 587 588 if (!(fc & IEEE80211_FCTL_PROTECTED)) 589 return 0; 590 591 IWL_DEBUG_RX(priv, "decrypt_res:0x%x\n", decrypt_res); 592 switch (decrypt_res & RX_RES_STATUS_SEC_TYPE_MSK) { 593 case RX_RES_STATUS_SEC_TYPE_TKIP: 594 /* The uCode has got a bad phase 1 Key, pushes the packet. 595 * Decryption will be done in SW. */ 596 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) == 597 RX_RES_STATUS_BAD_KEY_TTAK) 598 break; 599 600 case RX_RES_STATUS_SEC_TYPE_WEP: 601 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) == 602 RX_RES_STATUS_BAD_ICV_MIC) { 603 /* bad ICV, the packet is destroyed since the 604 * decryption is inplace, drop it */ 605 IWL_DEBUG_RX(priv, "Packet destroyed\n"); 606 return -1; 607 } 608 case RX_RES_STATUS_SEC_TYPE_CCMP: 609 if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) == 610 RX_RES_STATUS_DECRYPT_OK) { 611 IWL_DEBUG_RX(priv, "hw decrypt successfully!!!\n"); 612 stats->flag |= RX_FLAG_DECRYPTED; 613 } 614 break; 615 616 default: 617 break; 618 } 619 return 0; 620 } 621 622 static void iwlagn_pass_packet_to_mac80211(struct iwl_priv *priv, 623 struct ieee80211_hdr *hdr, 624 u16 len, 625 u32 ampdu_status, 626 struct iwl_rx_cmd_buffer *rxb, 627 struct ieee80211_rx_status *stats) 628 { 629 struct sk_buff *skb; 630 __le16 fc = hdr->frame_control; 631 struct iwl_rxon_context *ctx; 632 unsigned int hdrlen, fraglen; 633 634 /* We only process data packets if the interface is open */ 635 if (unlikely(!priv->is_open)) { 636 IWL_DEBUG_DROP_LIMIT(priv, 637 "Dropping packet while interface is not open.\n"); 638 return; 639 } 640 641 /* In case of HW accelerated crypto and bad decryption, drop */ 642 if (!iwlwifi_mod_params.swcrypto && 643 iwlagn_set_decrypted_flag(priv, hdr, ampdu_status, stats)) 644 return; 645 646 /* Dont use dev_alloc_skb(), we'll have enough headroom once 647 * ieee80211_hdr pulled. 648 */ 649 skb = alloc_skb(128, GFP_ATOMIC); 650 if (!skb) { 651 IWL_ERR(priv, "alloc_skb failed\n"); 652 return; 653 } 654 /* If frame is small enough to fit in skb->head, pull it completely. 655 * If not, only pull ieee80211_hdr so that splice() or TCP coalesce 656 * are more efficient. 657 */ 658 hdrlen = (len <= skb_tailroom(skb)) ? len : sizeof(*hdr); 659 660 skb_put_data(skb, hdr, hdrlen); 661 fraglen = len - hdrlen; 662 663 if (fraglen) { 664 int offset = (void *)hdr + hdrlen - 665 rxb_addr(rxb) + rxb_offset(rxb); 666 667 skb_add_rx_frag(skb, 0, rxb_steal_page(rxb), offset, 668 fraglen, rxb->truesize); 669 } 670 671 /* 672 * Wake any queues that were stopped due to a passive channel tx 673 * failure. This can happen because the regulatory enforcement in 674 * the device waits for a beacon before allowing transmission, 675 * sometimes even after already having transmitted frames for the 676 * association because the new RXON may reset the information. 677 */ 678 if (unlikely(ieee80211_is_beacon(fc) && priv->passive_no_rx)) { 679 for_each_context(priv, ctx) { 680 if (!ether_addr_equal(hdr->addr3, 681 ctx->active.bssid_addr)) 682 continue; 683 iwlagn_lift_passive_no_rx(priv); 684 } 685 } 686 687 memcpy(IEEE80211_SKB_RXCB(skb), stats, sizeof(*stats)); 688 689 ieee80211_rx_napi(priv->hw, NULL, skb, priv->napi); 690 } 691 692 static u32 iwlagn_translate_rx_status(struct iwl_priv *priv, u32 decrypt_in) 693 { 694 u32 decrypt_out = 0; 695 696 if ((decrypt_in & RX_RES_STATUS_STATION_FOUND) == 697 RX_RES_STATUS_STATION_FOUND) 698 decrypt_out |= (RX_RES_STATUS_STATION_FOUND | 699 RX_RES_STATUS_NO_STATION_INFO_MISMATCH); 700 701 decrypt_out |= (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK); 702 703 /* packet was not encrypted */ 704 if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) == 705 RX_RES_STATUS_SEC_TYPE_NONE) 706 return decrypt_out; 707 708 /* packet was encrypted with unknown alg */ 709 if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) == 710 RX_RES_STATUS_SEC_TYPE_ERR) 711 return decrypt_out; 712 713 /* decryption was not done in HW */ 714 if ((decrypt_in & RX_MPDU_RES_STATUS_DEC_DONE_MSK) != 715 RX_MPDU_RES_STATUS_DEC_DONE_MSK) 716 return decrypt_out; 717 718 switch (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) { 719 720 case RX_RES_STATUS_SEC_TYPE_CCMP: 721 /* alg is CCM: check MIC only */ 722 if (!(decrypt_in & RX_MPDU_RES_STATUS_MIC_OK)) 723 /* Bad MIC */ 724 decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC; 725 else 726 decrypt_out |= RX_RES_STATUS_DECRYPT_OK; 727 728 break; 729 730 case RX_RES_STATUS_SEC_TYPE_TKIP: 731 if (!(decrypt_in & RX_MPDU_RES_STATUS_TTAK_OK)) { 732 /* Bad TTAK */ 733 decrypt_out |= RX_RES_STATUS_BAD_KEY_TTAK; 734 break; 735 } 736 /* fall through if TTAK OK */ 737 default: 738 if (!(decrypt_in & RX_MPDU_RES_STATUS_ICV_OK)) 739 decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC; 740 else 741 decrypt_out |= RX_RES_STATUS_DECRYPT_OK; 742 break; 743 } 744 745 IWL_DEBUG_RX(priv, "decrypt_in:0x%x decrypt_out = 0x%x\n", 746 decrypt_in, decrypt_out); 747 748 return decrypt_out; 749 } 750 751 /* Calc max signal level (dBm) among 3 possible receivers */ 752 static int iwlagn_calc_rssi(struct iwl_priv *priv, 753 struct iwl_rx_phy_res *rx_resp) 754 { 755 /* data from PHY/DSP regarding signal strength, etc., 756 * contents are always there, not configurable by host 757 */ 758 struct iwlagn_non_cfg_phy *ncphy = 759 (struct iwlagn_non_cfg_phy *)rx_resp->non_cfg_phy_buf; 760 u32 val, rssi_a, rssi_b, rssi_c, max_rssi; 761 u8 agc; 762 763 val = le32_to_cpu(ncphy->non_cfg_phy[IWLAGN_RX_RES_AGC_IDX]); 764 agc = (val & IWLAGN_OFDM_AGC_MSK) >> IWLAGN_OFDM_AGC_BIT_POS; 765 766 /* Find max rssi among 3 possible receivers. 767 * These values are measured by the digital signal processor (DSP). 768 * They should stay fairly constant even as the signal strength varies, 769 * if the radio's automatic gain control (AGC) is working right. 770 * AGC value (see below) will provide the "interesting" info. 771 */ 772 val = le32_to_cpu(ncphy->non_cfg_phy[IWLAGN_RX_RES_RSSI_AB_IDX]); 773 rssi_a = (val & IWLAGN_OFDM_RSSI_INBAND_A_BITMSK) >> 774 IWLAGN_OFDM_RSSI_A_BIT_POS; 775 rssi_b = (val & IWLAGN_OFDM_RSSI_INBAND_B_BITMSK) >> 776 IWLAGN_OFDM_RSSI_B_BIT_POS; 777 val = le32_to_cpu(ncphy->non_cfg_phy[IWLAGN_RX_RES_RSSI_C_IDX]); 778 rssi_c = (val & IWLAGN_OFDM_RSSI_INBAND_C_BITMSK) >> 779 IWLAGN_OFDM_RSSI_C_BIT_POS; 780 781 max_rssi = max_t(u32, rssi_a, rssi_b); 782 max_rssi = max_t(u32, max_rssi, rssi_c); 783 784 IWL_DEBUG_STATS(priv, "Rssi In A %d B %d C %d Max %d AGC dB %d\n", 785 rssi_a, rssi_b, rssi_c, max_rssi, agc); 786 787 /* dBm = max_rssi dB - agc dB - constant. 788 * Higher AGC (higher radio gain) means lower signal. */ 789 return max_rssi - agc - IWLAGN_RSSI_OFFSET; 790 } 791 792 /* Called for REPLY_RX_MPDU_CMD */ 793 static void iwlagn_rx_reply_rx(struct iwl_priv *priv, 794 struct iwl_rx_cmd_buffer *rxb) 795 { 796 struct ieee80211_hdr *header; 797 struct ieee80211_rx_status rx_status = {}; 798 struct iwl_rx_packet *pkt = rxb_addr(rxb); 799 struct iwl_rx_phy_res *phy_res; 800 __le32 rx_pkt_status; 801 struct iwl_rx_mpdu_res_start *amsdu; 802 u32 len; 803 u32 ampdu_status; 804 u32 rate_n_flags; 805 806 if (!priv->last_phy_res_valid) { 807 IWL_ERR(priv, "MPDU frame without cached PHY data\n"); 808 return; 809 } 810 phy_res = &priv->last_phy_res; 811 amsdu = (struct iwl_rx_mpdu_res_start *)pkt->data; 812 header = (struct ieee80211_hdr *)(pkt->data + sizeof(*amsdu)); 813 len = le16_to_cpu(amsdu->byte_count); 814 rx_pkt_status = *(__le32 *)(pkt->data + sizeof(*amsdu) + len); 815 ampdu_status = iwlagn_translate_rx_status(priv, 816 le32_to_cpu(rx_pkt_status)); 817 818 if ((unlikely(phy_res->cfg_phy_cnt > 20))) { 819 IWL_DEBUG_DROP(priv, "dsp size out of range [0,20]: %d\n", 820 phy_res->cfg_phy_cnt); 821 return; 822 } 823 824 if (!(rx_pkt_status & RX_RES_STATUS_NO_CRC32_ERROR) || 825 !(rx_pkt_status & RX_RES_STATUS_NO_RXE_OVERFLOW)) { 826 IWL_DEBUG_RX(priv, "Bad CRC or FIFO: 0x%08X.\n", 827 le32_to_cpu(rx_pkt_status)); 828 return; 829 } 830 831 /* This will be used in several places later */ 832 rate_n_flags = le32_to_cpu(phy_res->rate_n_flags); 833 834 /* rx_status carries information about the packet to mac80211 */ 835 rx_status.mactime = le64_to_cpu(phy_res->timestamp); 836 rx_status.band = (phy_res->phy_flags & RX_RES_PHY_FLAGS_BAND_24_MSK) ? 837 NL80211_BAND_2GHZ : NL80211_BAND_5GHZ; 838 rx_status.freq = 839 ieee80211_channel_to_frequency(le16_to_cpu(phy_res->channel), 840 rx_status.band); 841 rx_status.rate_idx = 842 iwlagn_hwrate_to_mac80211_idx(rate_n_flags, rx_status.band); 843 rx_status.flag = 0; 844 845 /* TSF isn't reliable. In order to allow smooth user experience, 846 * this W/A doesn't propagate it to the mac80211 */ 847 /*rx_status.flag |= RX_FLAG_MACTIME_START;*/ 848 849 priv->ucode_beacon_time = le32_to_cpu(phy_res->beacon_time_stamp); 850 851 /* Find max signal strength (dBm) among 3 antenna/receiver chains */ 852 rx_status.signal = iwlagn_calc_rssi(priv, phy_res); 853 854 IWL_DEBUG_STATS_LIMIT(priv, "Rssi %d, TSF %llu\n", 855 rx_status.signal, (unsigned long long)rx_status.mactime); 856 857 /* 858 * "antenna number" 859 * 860 * It seems that the antenna field in the phy flags value 861 * is actually a bit field. This is undefined by radiotap, 862 * it wants an actual antenna number but I always get "7" 863 * for most legacy frames I receive indicating that the 864 * same frame was received on all three RX chains. 865 * 866 * I think this field should be removed in favor of a 867 * new 802.11n radiotap field "RX chains" that is defined 868 * as a bitmask. 869 */ 870 rx_status.antenna = 871 (le16_to_cpu(phy_res->phy_flags) & RX_RES_PHY_FLAGS_ANTENNA_MSK) 872 >> RX_RES_PHY_FLAGS_ANTENNA_POS; 873 874 /* set the preamble flag if appropriate */ 875 if (phy_res->phy_flags & RX_RES_PHY_FLAGS_SHORT_PREAMBLE_MSK) 876 rx_status.enc_flags |= RX_ENC_FLAG_SHORTPRE; 877 878 if (phy_res->phy_flags & RX_RES_PHY_FLAGS_AGG_MSK) { 879 /* 880 * We know which subframes of an A-MPDU belong 881 * together since we get a single PHY response 882 * from the firmware for all of them 883 */ 884 rx_status.flag |= RX_FLAG_AMPDU_DETAILS; 885 rx_status.ampdu_reference = priv->ampdu_ref; 886 } 887 888 /* Set up the HT phy flags */ 889 if (rate_n_flags & RATE_MCS_HT_MSK) 890 rx_status.encoding = RX_ENC_HT; 891 if (rate_n_flags & RATE_MCS_HT40_MSK) 892 rx_status.bw = RATE_INFO_BW_40; 893 else 894 rx_status.bw = RATE_INFO_BW_20; 895 if (rate_n_flags & RATE_MCS_SGI_MSK) 896 rx_status.enc_flags |= RX_ENC_FLAG_SHORT_GI; 897 if (rate_n_flags & RATE_MCS_GF_MSK) 898 rx_status.enc_flags |= RX_ENC_FLAG_HT_GF; 899 900 iwlagn_pass_packet_to_mac80211(priv, header, len, ampdu_status, 901 rxb, &rx_status); 902 } 903 904 static void iwlagn_rx_noa_notification(struct iwl_priv *priv, 905 struct iwl_rx_cmd_buffer *rxb) 906 { 907 struct iwl_wipan_noa_data *new_data, *old_data; 908 struct iwl_rx_packet *pkt = rxb_addr(rxb); 909 struct iwl_wipan_noa_notification *noa_notif = (void *)pkt->data; 910 911 /* no condition -- we're in softirq */ 912 old_data = rcu_dereference_protected(priv->noa_data, true); 913 914 if (noa_notif->noa_active) { 915 u32 len = le16_to_cpu(noa_notif->noa_attribute.length); 916 u32 copylen = len; 917 918 /* EID, len, OUI, subtype */ 919 len += 1 + 1 + 3 + 1; 920 /* P2P id, P2P length */ 921 len += 1 + 2; 922 copylen += 1 + 2; 923 924 new_data = kmalloc(sizeof(*new_data) + len, GFP_ATOMIC); 925 if (new_data) { 926 new_data->length = len; 927 new_data->data[0] = WLAN_EID_VENDOR_SPECIFIC; 928 new_data->data[1] = len - 2; /* not counting EID, len */ 929 new_data->data[2] = (WLAN_OUI_WFA >> 16) & 0xff; 930 new_data->data[3] = (WLAN_OUI_WFA >> 8) & 0xff; 931 new_data->data[4] = (WLAN_OUI_WFA >> 0) & 0xff; 932 new_data->data[5] = WLAN_OUI_TYPE_WFA_P2P; 933 memcpy(&new_data->data[6], &noa_notif->noa_attribute, 934 copylen); 935 } 936 } else 937 new_data = NULL; 938 939 rcu_assign_pointer(priv->noa_data, new_data); 940 941 if (old_data) 942 kfree_rcu(old_data, rcu_head); 943 } 944 945 /** 946 * iwl_setup_rx_handlers - Initialize Rx handler callbacks 947 * 948 * Setup the RX handlers for each of the reply types sent from the uCode 949 * to the host. 950 */ 951 void iwl_setup_rx_handlers(struct iwl_priv *priv) 952 { 953 void (**handlers)(struct iwl_priv *priv, struct iwl_rx_cmd_buffer *rxb); 954 955 handlers = priv->rx_handlers; 956 957 handlers[REPLY_ERROR] = iwlagn_rx_reply_error; 958 handlers[CHANNEL_SWITCH_NOTIFICATION] = iwlagn_rx_csa; 959 handlers[SPECTRUM_MEASURE_NOTIFICATION] = 960 iwlagn_rx_spectrum_measure_notif; 961 handlers[PM_SLEEP_NOTIFICATION] = iwlagn_rx_pm_sleep_notif; 962 handlers[PM_DEBUG_STATISTIC_NOTIFIC] = 963 iwlagn_rx_pm_debug_statistics_notif; 964 handlers[BEACON_NOTIFICATION] = iwlagn_rx_beacon_notif; 965 handlers[REPLY_ADD_STA] = iwl_add_sta_callback; 966 967 handlers[REPLY_WIPAN_NOA_NOTIFICATION] = iwlagn_rx_noa_notification; 968 969 /* 970 * The same handler is used for both the REPLY to a discrete 971 * statistics request from the host as well as for the periodic 972 * statistics notifications (after received beacons) from the uCode. 973 */ 974 handlers[REPLY_STATISTICS_CMD] = iwlagn_rx_reply_statistics; 975 handlers[STATISTICS_NOTIFICATION] = iwlagn_rx_statistics; 976 977 iwl_setup_rx_scan_handlers(priv); 978 979 handlers[CARD_STATE_NOTIFICATION] = iwlagn_rx_card_state_notif; 980 handlers[MISSED_BEACONS_NOTIFICATION] = 981 iwlagn_rx_missed_beacon_notif; 982 983 /* Rx handlers */ 984 handlers[REPLY_RX_PHY_CMD] = iwlagn_rx_reply_rx_phy; 985 handlers[REPLY_RX_MPDU_CMD] = iwlagn_rx_reply_rx; 986 987 /* block ack */ 988 handlers[REPLY_COMPRESSED_BA] = 989 iwlagn_rx_reply_compressed_ba; 990 991 priv->rx_handlers[REPLY_TX] = iwlagn_rx_reply_tx; 992 993 /* set up notification wait support */ 994 iwl_notification_wait_init(&priv->notif_wait); 995 996 /* Set up BT Rx handlers */ 997 if (priv->lib->bt_params) 998 iwlagn_bt_rx_handler_setup(priv); 999 } 1000 1001 void iwl_rx_dispatch(struct iwl_op_mode *op_mode, struct napi_struct *napi, 1002 struct iwl_rx_cmd_buffer *rxb) 1003 { 1004 struct iwl_rx_packet *pkt = rxb_addr(rxb); 1005 struct iwl_priv *priv = IWL_OP_MODE_GET_DVM(op_mode); 1006 1007 /* 1008 * Do the notification wait before RX handlers so 1009 * even if the RX handler consumes the RXB we have 1010 * access to it in the notification wait entry. 1011 */ 1012 iwl_notification_wait_notify(&priv->notif_wait, pkt); 1013 1014 /* Based on type of command response or notification, 1015 * handle those that need handling via function in 1016 * rx_handlers table. See iwl_setup_rx_handlers() */ 1017 if (priv->rx_handlers[pkt->hdr.cmd]) { 1018 priv->rx_handlers_stats[pkt->hdr.cmd]++; 1019 priv->rx_handlers[pkt->hdr.cmd](priv, rxb); 1020 } else { 1021 /* No handling needed */ 1022 IWL_DEBUG_RX(priv, "No handler needed for %s, 0x%02x\n", 1023 iwl_get_cmd_string(priv->trans, 1024 iwl_cmd_id(pkt->hdr.cmd, 1025 0, 0)), 1026 pkt->hdr.cmd); 1027 } 1028 } 1029