// SPDX-License-Identifier: GPL-2.0-only /****************************************************************************** * * Copyright(c) 2003 - 2014 Intel Corporation. All rights reserved. * Copyright(c) 2015 Intel Deutschland GmbH * Copyright(c) 2018, 2020-2021 Intel Corporation * * Portions of this file are derived from the ipw3945 project, as well * as portionhelp of the ieee80211 subsystem header files. *****************************************************************************/ #include #include #include #include #include #include "iwl-trans.h" #include "iwl-io.h" #include "dev.h" #include "calib.h" #include "agn.h" /****************************************************************************** * * Generic RX handler implementations * ******************************************************************************/ static void iwlagn_rx_reply_error(struct iwl_priv *priv, struct iwl_rx_cmd_buffer *rxb) { struct iwl_rx_packet *pkt = rxb_addr(rxb); struct iwl_error_resp *err_resp = (void *)pkt->data; IWL_ERR(priv, "Error Reply type 0x%08X cmd REPLY_ERROR (0x%02X) " "seq 0x%04X ser 0x%08X\n", le32_to_cpu(err_resp->error_type), err_resp->cmd_id, le16_to_cpu(err_resp->bad_cmd_seq_num), le32_to_cpu(err_resp->error_info)); } static void iwlagn_rx_csa(struct iwl_priv *priv, struct iwl_rx_cmd_buffer *rxb) { struct iwl_rx_packet *pkt = rxb_addr(rxb); struct iwl_csa_notification *csa = (void *)pkt->data; /* * MULTI-FIXME * See iwlagn_mac_channel_switch. */ struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS]; struct iwl_rxon_cmd *rxon = (void *)&ctx->active; if (!test_bit(STATUS_CHANNEL_SWITCH_PENDING, &priv->status)) return; if (!le32_to_cpu(csa->status) && csa->channel == priv->switch_channel) { rxon->channel = csa->channel; ctx->staging.channel = csa->channel; IWL_DEBUG_11H(priv, "CSA notif: channel %d\n", le16_to_cpu(csa->channel)); iwl_chswitch_done(priv, true); } else { IWL_ERR(priv, "CSA notif (fail) : channel %d\n", le16_to_cpu(csa->channel)); iwl_chswitch_done(priv, false); } } static void iwlagn_rx_spectrum_measure_notif(struct iwl_priv *priv, struct iwl_rx_cmd_buffer *rxb) { struct iwl_rx_packet *pkt = rxb_addr(rxb); struct iwl_spectrum_notification *report = (void *)pkt->data; if (!report->state) { IWL_DEBUG_11H(priv, "Spectrum Measure Notification: Start\n"); return; } memcpy(&priv->measure_report, report, sizeof(*report)); priv->measurement_status |= MEASUREMENT_READY; } static void iwlagn_rx_pm_sleep_notif(struct iwl_priv *priv, struct iwl_rx_cmd_buffer *rxb) { #ifdef CONFIG_IWLWIFI_DEBUG struct iwl_rx_packet *pkt = rxb_addr(rxb); struct iwl_sleep_notification *sleep = (void *)pkt->data; IWL_DEBUG_RX(priv, "sleep mode: %d, src: %d\n", sleep->pm_sleep_mode, sleep->pm_wakeup_src); #endif } static void iwlagn_rx_pm_debug_statistics_notif(struct iwl_priv *priv, struct iwl_rx_cmd_buffer *rxb) { struct iwl_rx_packet *pkt = rxb_addr(rxb); u32 __maybe_unused len = iwl_rx_packet_len(pkt); IWL_DEBUG_RADIO(priv, "Dumping %d bytes of unhandled " "notification for PM_DEBUG_STATISTIC_NOTIFIC:\n", len); iwl_print_hex_dump(priv, IWL_DL_RADIO, pkt->data, len); } static void iwlagn_rx_beacon_notif(struct iwl_priv *priv, struct iwl_rx_cmd_buffer *rxb) { struct iwl_rx_packet *pkt = rxb_addr(rxb); struct iwlagn_beacon_notif *beacon = (void *)pkt->data; #ifdef CONFIG_IWLWIFI_DEBUG u16 status = le16_to_cpu(beacon->beacon_notify_hdr.status.status); u8 rate = iwl_hw_get_rate(beacon->beacon_notify_hdr.rate_n_flags); IWL_DEBUG_RX(priv, "beacon status %#x, retries:%d ibssmgr:%d " "tsf:0x%.8x%.8x rate:%d\n", status & TX_STATUS_MSK, beacon->beacon_notify_hdr.failure_frame, le32_to_cpu(beacon->ibss_mgr_status), le32_to_cpu(beacon->high_tsf), le32_to_cpu(beacon->low_tsf), rate); #endif priv->ibss_manager = le32_to_cpu(beacon->ibss_mgr_status); } /* * iwl_good_plcp_health - checks for plcp error. * * When the plcp error is exceeding the thresholds, reset the radio * to improve the throughput. */ static bool iwlagn_good_plcp_health(struct iwl_priv *priv, struct statistics_rx_phy *cur_ofdm, struct statistics_rx_ht_phy *cur_ofdm_ht, unsigned int msecs) { int delta; int threshold = priv->plcp_delta_threshold; if (threshold == IWL_MAX_PLCP_ERR_THRESHOLD_DISABLE) { IWL_DEBUG_RADIO(priv, "plcp_err check disabled\n"); return true; } delta = le32_to_cpu(cur_ofdm->plcp_err) - le32_to_cpu(priv->statistics.rx_ofdm.plcp_err) + le32_to_cpu(cur_ofdm_ht->plcp_err) - le32_to_cpu(priv->statistics.rx_ofdm_ht.plcp_err); /* Can be negative if firmware reset statistics */ if (delta <= 0) return true; if ((delta * 100 / msecs) > threshold) { IWL_DEBUG_RADIO(priv, "plcp health threshold %u delta %d msecs %u\n", threshold, delta, msecs); return false; } return true; } int iwl_force_rf_reset(struct iwl_priv *priv, bool external) { struct iwl_rf_reset *rf_reset; if (test_bit(STATUS_EXIT_PENDING, &priv->status)) return -EAGAIN; if (!iwl_is_any_associated(priv)) { IWL_DEBUG_SCAN(priv, "force reset rejected: not associated\n"); return -ENOLINK; } rf_reset = &priv->rf_reset; rf_reset->reset_request_count++; if (!external && rf_reset->last_reset_jiffies && time_after(rf_reset->last_reset_jiffies + IWL_DELAY_NEXT_FORCE_RF_RESET, jiffies)) { IWL_DEBUG_INFO(priv, "RF reset rejected\n"); rf_reset->reset_reject_count++; return -EAGAIN; } rf_reset->reset_success_count++; rf_reset->last_reset_jiffies = jiffies; /* * There is no easy and better way to force reset the radio, * the only known method is switching channel which will force to * reset and tune the radio. * Use internal short scan (single channel) operation to should * achieve this objective. * Driver should reset the radio when number of consecutive missed * beacon, or any other uCode error condition detected. */ IWL_DEBUG_INFO(priv, "perform radio reset.\n"); iwl_internal_short_hw_scan(priv); return 0; } static void iwlagn_recover_from_statistics(struct iwl_priv *priv, struct statistics_rx_phy *cur_ofdm, struct statistics_rx_ht_phy *cur_ofdm_ht, struct statistics_tx *tx, unsigned long stamp) { unsigned int msecs; if (test_bit(STATUS_EXIT_PENDING, &priv->status)) return; msecs = jiffies_to_msecs(stamp - priv->rx_statistics_jiffies); /* Only gather statistics and update time stamp when not associated */ if (!iwl_is_any_associated(priv)) return; /* Do not check/recover when do not have enough statistics data */ if (msecs < 99) return; if (!iwlagn_good_plcp_health(priv, cur_ofdm, cur_ofdm_ht, msecs)) iwl_force_rf_reset(priv, false); } /* Calculate noise level, based on measurements during network silence just * before arriving beacon. This measurement can be done only if we know * exactly when to expect beacons, therefore only when we're associated. */ static void iwlagn_rx_calc_noise(struct iwl_priv *priv) { struct statistics_rx_non_phy *rx_info; int num_active_rx = 0; int total_silence = 0; int bcn_silence_a, bcn_silence_b, bcn_silence_c; int last_rx_noise; rx_info = &priv->statistics.rx_non_phy; bcn_silence_a = le32_to_cpu(rx_info->beacon_silence_rssi_a) & IN_BAND_FILTER; bcn_silence_b = le32_to_cpu(rx_info->beacon_silence_rssi_b) & IN_BAND_FILTER; bcn_silence_c = le32_to_cpu(rx_info->beacon_silence_rssi_c) & IN_BAND_FILTER; if (bcn_silence_a) { total_silence += bcn_silence_a; num_active_rx++; } if (bcn_silence_b) { total_silence += bcn_silence_b; num_active_rx++; } if (bcn_silence_c) { total_silence += bcn_silence_c; num_active_rx++; } /* Average among active antennas */ if (num_active_rx) last_rx_noise = (total_silence / num_active_rx) - 107; else last_rx_noise = IWL_NOISE_MEAS_NOT_AVAILABLE; IWL_DEBUG_CALIB(priv, "inband silence a %u, b %u, c %u, dBm %d\n", bcn_silence_a, bcn_silence_b, bcn_silence_c, last_rx_noise); } #ifdef CONFIG_IWLWIFI_DEBUGFS /* * based on the assumption of all statistics counter are in DWORD * FIXME: This function is for debugging, do not deal with * the case of counters roll-over. */ static void accum_stats(__le32 *prev, __le32 *cur, __le32 *delta, __le32 *max_delta, __le32 *accum, int size) { int i; for (i = 0; i < size / sizeof(__le32); i++, prev++, cur++, delta++, max_delta++, accum++) { if (le32_to_cpu(*cur) > le32_to_cpu(*prev)) { *delta = cpu_to_le32( le32_to_cpu(*cur) - le32_to_cpu(*prev)); le32_add_cpu(accum, le32_to_cpu(*delta)); if (le32_to_cpu(*delta) > le32_to_cpu(*max_delta)) *max_delta = *delta; } } } static void iwlagn_accumulative_statistics(struct iwl_priv *priv, struct statistics_general_common *common, struct statistics_rx_non_phy *rx_non_phy, struct statistics_rx_phy *rx_ofdm, struct statistics_rx_ht_phy *rx_ofdm_ht, struct statistics_rx_phy *rx_cck, struct statistics_tx *tx, struct statistics_bt_activity *bt_activity) { #define ACCUM(_name) \ accum_stats((__le32 *)&priv->statistics._name, \ (__le32 *)_name, \ (__le32 *)&priv->delta_stats._name, \ (__le32 *)&priv->max_delta_stats._name, \ (__le32 *)&priv->accum_stats._name, \ sizeof(*_name)) ACCUM(common); ACCUM(rx_non_phy); ACCUM(rx_ofdm); ACCUM(rx_ofdm_ht); ACCUM(rx_cck); ACCUM(tx); if (bt_activity) ACCUM(bt_activity); #undef ACCUM } #else static inline void iwlagn_accumulative_statistics(struct iwl_priv *priv, struct statistics_general_common *common, struct statistics_rx_non_phy *rx_non_phy, struct statistics_rx_phy *rx_ofdm, struct statistics_rx_ht_phy *rx_ofdm_ht, struct statistics_rx_phy *rx_cck, struct statistics_tx *tx, struct statistics_bt_activity *bt_activity) { } #endif static void iwlagn_rx_statistics(struct iwl_priv *priv, struct iwl_rx_cmd_buffer *rxb) { unsigned long stamp = jiffies; const int reg_recalib_period = 60; int change; struct iwl_rx_packet *pkt = rxb_addr(rxb); u32 len = iwl_rx_packet_payload_len(pkt); __le32 *flag; struct statistics_general_common *common; struct statistics_rx_non_phy *rx_non_phy; struct statistics_rx_phy *rx_ofdm; struct statistics_rx_ht_phy *rx_ofdm_ht; struct statistics_rx_phy *rx_cck; struct statistics_tx *tx; struct statistics_bt_activity *bt_activity; IWL_DEBUG_RX(priv, "Statistics notification received (%d bytes).\n", len); spin_lock(&priv->statistics.lock); if (len == sizeof(struct iwl_bt_notif_statistics)) { struct iwl_bt_notif_statistics *stats; stats = (void *)&pkt->data; flag = &stats->flag; common = &stats->general.common; rx_non_phy = &stats->rx.general.common; rx_ofdm = &stats->rx.ofdm; rx_ofdm_ht = &stats->rx.ofdm_ht; rx_cck = &stats->rx.cck; tx = &stats->tx; bt_activity = &stats->general.activity; #ifdef CONFIG_IWLWIFI_DEBUGFS /* handle this exception directly */ priv->statistics.num_bt_kills = stats->rx.general.num_bt_kills; le32_add_cpu(&priv->statistics.accum_num_bt_kills, le32_to_cpu(stats->rx.general.num_bt_kills)); #endif } else if (len == sizeof(struct iwl_notif_statistics)) { struct iwl_notif_statistics *stats; stats = (void *)&pkt->data; flag = &stats->flag; common = &stats->general.common; rx_non_phy = &stats->rx.general; rx_ofdm = &stats->rx.ofdm; rx_ofdm_ht = &stats->rx.ofdm_ht; rx_cck = &stats->rx.cck; tx = &stats->tx; bt_activity = NULL; } else { WARN_ONCE(1, "len %d doesn't match BT (%zu) or normal (%zu)\n", len, sizeof(struct iwl_bt_notif_statistics), sizeof(struct iwl_notif_statistics)); spin_unlock(&priv->statistics.lock); return; } change = common->temperature != priv->statistics.common.temperature || (*flag & STATISTICS_REPLY_FLG_HT40_MODE_MSK) != (priv->statistics.flag & STATISTICS_REPLY_FLG_HT40_MODE_MSK); iwlagn_accumulative_statistics(priv, common, rx_non_phy, rx_ofdm, rx_ofdm_ht, rx_cck, tx, bt_activity); iwlagn_recover_from_statistics(priv, rx_ofdm, rx_ofdm_ht, tx, stamp); priv->statistics.flag = *flag; memcpy(&priv->statistics.common, common, sizeof(*common)); memcpy(&priv->statistics.rx_non_phy, rx_non_phy, sizeof(*rx_non_phy)); memcpy(&priv->statistics.rx_ofdm, rx_ofdm, sizeof(*rx_ofdm)); memcpy(&priv->statistics.rx_ofdm_ht, rx_ofdm_ht, sizeof(*rx_ofdm_ht)); memcpy(&priv->statistics.rx_cck, rx_cck, sizeof(*rx_cck)); memcpy(&priv->statistics.tx, tx, sizeof(*tx)); #ifdef CONFIG_IWLWIFI_DEBUGFS if (bt_activity) memcpy(&priv->statistics.bt_activity, bt_activity, sizeof(*bt_activity)); #endif priv->rx_statistics_jiffies = stamp; set_bit(STATUS_STATISTICS, &priv->status); /* Reschedule the statistics timer to occur in * reg_recalib_period seconds to ensure we get a * thermal update even if the uCode doesn't give * us one */ mod_timer(&priv->statistics_periodic, jiffies + msecs_to_jiffies(reg_recalib_period * 1000)); if (unlikely(!test_bit(STATUS_SCANNING, &priv->status)) && (pkt->hdr.cmd == STATISTICS_NOTIFICATION)) { iwlagn_rx_calc_noise(priv); queue_work(priv->workqueue, &priv->run_time_calib_work); } if (priv->lib->temperature && change) priv->lib->temperature(priv); spin_unlock(&priv->statistics.lock); } static void iwlagn_rx_reply_statistics(struct iwl_priv *priv, struct iwl_rx_cmd_buffer *rxb) { struct iwl_rx_packet *pkt = rxb_addr(rxb); struct iwl_notif_statistics *stats = (void *)pkt->data; if (le32_to_cpu(stats->flag) & UCODE_STATISTICS_CLEAR_MSK) { #ifdef CONFIG_IWLWIFI_DEBUGFS memset(&priv->accum_stats, 0, sizeof(priv->accum_stats)); memset(&priv->delta_stats, 0, sizeof(priv->delta_stats)); memset(&priv->max_delta_stats, 0, sizeof(priv->max_delta_stats)); #endif IWL_DEBUG_RX(priv, "Statistics have been cleared\n"); } iwlagn_rx_statistics(priv, rxb); } /* Handle notification from uCode that card's power state is changing * due to software, hardware, or critical temperature RFKILL */ static void iwlagn_rx_card_state_notif(struct iwl_priv *priv, struct iwl_rx_cmd_buffer *rxb) { struct iwl_rx_packet *pkt = rxb_addr(rxb); struct iwl_card_state_notif *card_state_notif = (void *)pkt->data; u32 flags = le32_to_cpu(card_state_notif->flags); unsigned long status = priv->status; IWL_DEBUG_RF_KILL(priv, "Card state received: HW:%s SW:%s CT:%s\n", (flags & HW_CARD_DISABLED) ? "Kill" : "On", (flags & SW_CARD_DISABLED) ? "Kill" : "On", (flags & CT_CARD_DISABLED) ? "Reached" : "Not reached"); if (flags & (SW_CARD_DISABLED | HW_CARD_DISABLED | CT_CARD_DISABLED)) { iwl_write32(priv->trans, CSR_UCODE_DRV_GP1_SET, CSR_UCODE_DRV_GP1_BIT_CMD_BLOCKED); iwl_write_direct32(priv->trans, HBUS_TARG_MBX_C, HBUS_TARG_MBX_C_REG_BIT_CMD_BLOCKED); if (!(flags & RXON_CARD_DISABLED)) { iwl_write32(priv->trans, CSR_UCODE_DRV_GP1_CLR, CSR_UCODE_DRV_GP1_BIT_CMD_BLOCKED); iwl_write_direct32(priv->trans, HBUS_TARG_MBX_C, HBUS_TARG_MBX_C_REG_BIT_CMD_BLOCKED); } if (flags & CT_CARD_DISABLED) iwl_tt_enter_ct_kill(priv); } if (!(flags & CT_CARD_DISABLED)) iwl_tt_exit_ct_kill(priv); if (flags & HW_CARD_DISABLED) set_bit(STATUS_RF_KILL_HW, &priv->status); else clear_bit(STATUS_RF_KILL_HW, &priv->status); if (!(flags & RXON_CARD_DISABLED)) iwl_scan_cancel(priv); if ((test_bit(STATUS_RF_KILL_HW, &status) != test_bit(STATUS_RF_KILL_HW, &priv->status))) wiphy_rfkill_set_hw_state(priv->hw->wiphy, test_bit(STATUS_RF_KILL_HW, &priv->status)); } static void iwlagn_rx_missed_beacon_notif(struct iwl_priv *priv, struct iwl_rx_cmd_buffer *rxb) { struct iwl_rx_packet *pkt = rxb_addr(rxb); struct iwl_missed_beacon_notif *missed_beacon = (void *)pkt->data; if (le32_to_cpu(missed_beacon->consecutive_missed_beacons) > priv->missed_beacon_threshold) { IWL_DEBUG_CALIB(priv, "missed bcn cnsq %d totl %d rcd %d expctd %d\n", le32_to_cpu(missed_beacon->consecutive_missed_beacons), le32_to_cpu(missed_beacon->total_missed_becons), le32_to_cpu(missed_beacon->num_recvd_beacons), le32_to_cpu(missed_beacon->num_expected_beacons)); if (!test_bit(STATUS_SCANNING, &priv->status)) iwl_init_sensitivity(priv); } } /* Cache phy data (Rx signal strength, etc) for HT frame (REPLY_RX_PHY_CMD). * This will be used later in iwl_rx_reply_rx() for REPLY_RX_MPDU_CMD. */ static void iwlagn_rx_reply_rx_phy(struct iwl_priv *priv, struct iwl_rx_cmd_buffer *rxb) { struct iwl_rx_packet *pkt = rxb_addr(rxb); priv->last_phy_res_valid = true; priv->ampdu_ref++; memcpy(&priv->last_phy_res, pkt->data, sizeof(struct iwl_rx_phy_res)); } /* * returns non-zero if packet should be dropped */ static int iwlagn_set_decrypted_flag(struct iwl_priv *priv, struct ieee80211_hdr *hdr, u32 decrypt_res, struct ieee80211_rx_status *stats) { u16 fc = le16_to_cpu(hdr->frame_control); /* * All contexts have the same setting here due to it being * a module parameter, so OK to check any context. */ if (priv->contexts[IWL_RXON_CTX_BSS].active.filter_flags & RXON_FILTER_DIS_DECRYPT_MSK) return 0; if (!(fc & IEEE80211_FCTL_PROTECTED)) return 0; IWL_DEBUG_RX(priv, "decrypt_res:0x%x\n", decrypt_res); switch (decrypt_res & RX_RES_STATUS_SEC_TYPE_MSK) { case RX_RES_STATUS_SEC_TYPE_TKIP: /* The uCode has got a bad phase 1 Key, pushes the packet. * Decryption will be done in SW. */ if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) == RX_RES_STATUS_BAD_KEY_TTAK) break; fallthrough; case RX_RES_STATUS_SEC_TYPE_WEP: if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) == RX_RES_STATUS_BAD_ICV_MIC) { /* bad ICV, the packet is destroyed since the * decryption is inplace, drop it */ IWL_DEBUG_RX(priv, "Packet destroyed\n"); return -1; } fallthrough; case RX_RES_STATUS_SEC_TYPE_CCMP: if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) == RX_RES_STATUS_DECRYPT_OK) { IWL_DEBUG_RX(priv, "hw decrypt successfully!!!\n"); stats->flag |= RX_FLAG_DECRYPTED; } break; default: break; } return 0; } static void iwlagn_pass_packet_to_mac80211(struct iwl_priv *priv, struct ieee80211_hdr *hdr, u16 len, u32 ampdu_status, struct iwl_rx_cmd_buffer *rxb, struct ieee80211_rx_status *stats) { struct sk_buff *skb; __le16 fc = hdr->frame_control; struct iwl_rxon_context *ctx; unsigned int hdrlen, fraglen; /* We only process data packets if the interface is open */ if (unlikely(!priv->is_open)) { IWL_DEBUG_DROP_LIMIT(priv, "Dropping packet while interface is not open.\n"); return; } /* In case of HW accelerated crypto and bad decryption, drop */ if (!iwlwifi_mod_params.swcrypto && iwlagn_set_decrypted_flag(priv, hdr, ampdu_status, stats)) return; /* Dont use dev_alloc_skb(), we'll have enough headroom once * ieee80211_hdr pulled. */ skb = alloc_skb(128, GFP_ATOMIC); if (!skb) { IWL_ERR(priv, "alloc_skb failed\n"); return; } /* If frame is small enough to fit in skb->head, pull it completely. * If not, only pull ieee80211_hdr so that splice() or TCP coalesce * are more efficient. */ hdrlen = (len <= skb_tailroom(skb)) ? len : sizeof(*hdr); skb_put_data(skb, hdr, hdrlen); fraglen = len - hdrlen; if (fraglen) { int offset = (void *)hdr + hdrlen - rxb_addr(rxb) + rxb_offset(rxb); skb_add_rx_frag(skb, 0, rxb_steal_page(rxb), offset, fraglen, rxb->truesize); } /* * Wake any queues that were stopped due to a passive channel tx * failure. This can happen because the regulatory enforcement in * the device waits for a beacon before allowing transmission, * sometimes even after already having transmitted frames for the * association because the new RXON may reset the information. */ if (unlikely(ieee80211_is_beacon(fc) && priv->passive_no_rx)) { for_each_context(priv, ctx) { if (!ether_addr_equal(hdr->addr3, ctx->active.bssid_addr)) continue; iwlagn_lift_passive_no_rx(priv); } } memcpy(IEEE80211_SKB_RXCB(skb), stats, sizeof(*stats)); ieee80211_rx_napi(priv->hw, NULL, skb, priv->napi); } static u32 iwlagn_translate_rx_status(struct iwl_priv *priv, u32 decrypt_in) { u32 decrypt_out = 0; if ((decrypt_in & RX_RES_STATUS_STATION_FOUND) == RX_RES_STATUS_STATION_FOUND) decrypt_out |= (RX_RES_STATUS_STATION_FOUND | RX_RES_STATUS_NO_STATION_INFO_MISMATCH); decrypt_out |= (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK); /* packet was not encrypted */ if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) == RX_RES_STATUS_SEC_TYPE_NONE) return decrypt_out; /* packet was encrypted with unknown alg */ if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) == RX_RES_STATUS_SEC_TYPE_ERR) return decrypt_out; /* decryption was not done in HW */ if ((decrypt_in & RX_MPDU_RES_STATUS_DEC_DONE_MSK) != RX_MPDU_RES_STATUS_DEC_DONE_MSK) return decrypt_out; switch (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) { case RX_RES_STATUS_SEC_TYPE_CCMP: /* alg is CCM: check MIC only */ if (!(decrypt_in & RX_MPDU_RES_STATUS_MIC_OK)) /* Bad MIC */ decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC; else decrypt_out |= RX_RES_STATUS_DECRYPT_OK; break; case RX_RES_STATUS_SEC_TYPE_TKIP: if (!(decrypt_in & RX_MPDU_RES_STATUS_TTAK_OK)) { /* Bad TTAK */ decrypt_out |= RX_RES_STATUS_BAD_KEY_TTAK; break; } fallthrough; default: if (!(decrypt_in & RX_MPDU_RES_STATUS_ICV_OK)) decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC; else decrypt_out |= RX_RES_STATUS_DECRYPT_OK; break; } IWL_DEBUG_RX(priv, "decrypt_in:0x%x decrypt_out = 0x%x\n", decrypt_in, decrypt_out); return decrypt_out; } /* Calc max signal level (dBm) among 3 possible receivers */ static int iwlagn_calc_rssi(struct iwl_priv *priv, struct iwl_rx_phy_res *rx_resp) { /* data from PHY/DSP regarding signal strength, etc., * contents are always there, not configurable by host */ struct iwlagn_non_cfg_phy *ncphy = (struct iwlagn_non_cfg_phy *)rx_resp->non_cfg_phy_buf; u32 val, rssi_a, rssi_b, rssi_c, max_rssi; u8 agc; val = le32_to_cpu(ncphy->non_cfg_phy[IWLAGN_RX_RES_AGC_IDX]); agc = (val & IWLAGN_OFDM_AGC_MSK) >> IWLAGN_OFDM_AGC_BIT_POS; /* Find max rssi among 3 possible receivers. * These values are measured by the digital signal processor (DSP). * They should stay fairly constant even as the signal strength varies, * if the radio's automatic gain control (AGC) is working right. * AGC value (see below) will provide the "interesting" info. */ val = le32_to_cpu(ncphy->non_cfg_phy[IWLAGN_RX_RES_RSSI_AB_IDX]); rssi_a = (val & IWLAGN_OFDM_RSSI_INBAND_A_BITMSK) >> IWLAGN_OFDM_RSSI_A_BIT_POS; rssi_b = (val & IWLAGN_OFDM_RSSI_INBAND_B_BITMSK) >> IWLAGN_OFDM_RSSI_B_BIT_POS; val = le32_to_cpu(ncphy->non_cfg_phy[IWLAGN_RX_RES_RSSI_C_IDX]); rssi_c = (val & IWLAGN_OFDM_RSSI_INBAND_C_BITMSK) >> IWLAGN_OFDM_RSSI_C_BIT_POS; max_rssi = max_t(u32, rssi_a, rssi_b); max_rssi = max_t(u32, max_rssi, rssi_c); IWL_DEBUG_STATS(priv, "Rssi In A %d B %d C %d Max %d AGC dB %d\n", rssi_a, rssi_b, rssi_c, max_rssi, agc); /* dBm = max_rssi dB - agc dB - constant. * Higher AGC (higher radio gain) means lower signal. */ return max_rssi - agc - IWLAGN_RSSI_OFFSET; } /* Called for REPLY_RX_MPDU_CMD */ static void iwlagn_rx_reply_rx(struct iwl_priv *priv, struct iwl_rx_cmd_buffer *rxb) { struct ieee80211_hdr *header; struct ieee80211_rx_status rx_status = {}; struct iwl_rx_packet *pkt = rxb_addr(rxb); struct iwl_rx_phy_res *phy_res; __le32 rx_pkt_status; struct iwl_rx_mpdu_res_start *amsdu; u32 len, pkt_len = iwl_rx_packet_len(pkt); u32 ampdu_status; u32 rate_n_flags; if (!priv->last_phy_res_valid) { IWL_ERR(priv, "MPDU frame without cached PHY data\n"); return; } if (unlikely(pkt_len < sizeof(*amsdu))) { IWL_DEBUG_DROP(priv, "Bad REPLY_RX_MPDU_CMD size\n"); return; } phy_res = &priv->last_phy_res; amsdu = (struct iwl_rx_mpdu_res_start *)pkt->data; header = (struct ieee80211_hdr *)(pkt->data + sizeof(*amsdu)); len = le16_to_cpu(amsdu->byte_count); if (unlikely(len + sizeof(*amsdu) + sizeof(__le32) > pkt_len)) { IWL_DEBUG_DROP(priv, "FW lied about packet len\n"); return; } rx_pkt_status = *(__le32 *)(pkt->data + sizeof(*amsdu) + len); ampdu_status = iwlagn_translate_rx_status(priv, le32_to_cpu(rx_pkt_status)); if ((unlikely(phy_res->cfg_phy_cnt > 20))) { IWL_DEBUG_DROP(priv, "dsp size out of range [0,20]: %d\n", phy_res->cfg_phy_cnt); return; } if (!(rx_pkt_status & RX_RES_STATUS_NO_CRC32_ERROR) || !(rx_pkt_status & RX_RES_STATUS_NO_RXE_OVERFLOW)) { IWL_DEBUG_RX(priv, "Bad CRC or FIFO: 0x%08X.\n", le32_to_cpu(rx_pkt_status)); return; } /* This will be used in several places later */ rate_n_flags = le32_to_cpu(phy_res->rate_n_flags); /* rx_status carries information about the packet to mac80211 */ rx_status.mactime = le64_to_cpu(phy_res->timestamp); rx_status.band = (phy_res->phy_flags & RX_RES_PHY_FLAGS_BAND_24_MSK) ? NL80211_BAND_2GHZ : NL80211_BAND_5GHZ; rx_status.freq = ieee80211_channel_to_frequency(le16_to_cpu(phy_res->channel), rx_status.band); rx_status.rate_idx = iwlagn_hwrate_to_mac80211_idx(rate_n_flags, rx_status.band); rx_status.flag = 0; /* TSF isn't reliable. In order to allow smooth user experience, * this W/A doesn't propagate it to the mac80211 */ /*rx_status.flag |= RX_FLAG_MACTIME_START;*/ priv->ucode_beacon_time = le32_to_cpu(phy_res->beacon_time_stamp); /* Find max signal strength (dBm) among 3 antenna/receiver chains */ rx_status.signal = iwlagn_calc_rssi(priv, phy_res); IWL_DEBUG_STATS_LIMIT(priv, "Rssi %d, TSF %llu\n", rx_status.signal, (unsigned long long)rx_status.mactime); /* * "antenna number" * * It seems that the antenna field in the phy flags value * is actually a bit field. This is undefined by radiotap, * it wants an actual antenna number but I always get "7" * for most legacy frames I receive indicating that the * same frame was received on all three RX chains. * * I think this field should be removed in favor of a * new 802.11n radiotap field "RX chains" that is defined * as a bitmask. */ rx_status.antenna = (le16_to_cpu(phy_res->phy_flags) & RX_RES_PHY_FLAGS_ANTENNA_MSK) >> RX_RES_PHY_FLAGS_ANTENNA_POS; /* set the preamble flag if appropriate */ if (phy_res->phy_flags & RX_RES_PHY_FLAGS_SHORT_PREAMBLE_MSK) rx_status.enc_flags |= RX_ENC_FLAG_SHORTPRE; if (phy_res->phy_flags & RX_RES_PHY_FLAGS_AGG_MSK) { /* * We know which subframes of an A-MPDU belong * together since we get a single PHY response * from the firmware for all of them */ rx_status.flag |= RX_FLAG_AMPDU_DETAILS; rx_status.ampdu_reference = priv->ampdu_ref; } /* Set up the HT phy flags */ if (rate_n_flags & RATE_MCS_HT_MSK) rx_status.encoding = RX_ENC_HT; if (rate_n_flags & RATE_MCS_HT40_MSK) rx_status.bw = RATE_INFO_BW_40; else rx_status.bw = RATE_INFO_BW_20; if (rate_n_flags & RATE_MCS_SGI_MSK) rx_status.enc_flags |= RX_ENC_FLAG_SHORT_GI; if (rate_n_flags & RATE_MCS_GF_MSK) rx_status.enc_flags |= RX_ENC_FLAG_HT_GF; iwlagn_pass_packet_to_mac80211(priv, header, len, ampdu_status, rxb, &rx_status); } static void iwlagn_rx_noa_notification(struct iwl_priv *priv, struct iwl_rx_cmd_buffer *rxb) { struct iwl_wipan_noa_data *new_data, *old_data; struct iwl_rx_packet *pkt = rxb_addr(rxb); struct iwl_wipan_noa_notification *noa_notif = (void *)pkt->data; /* no condition -- we're in softirq */ old_data = rcu_dereference_protected(priv->noa_data, true); if (noa_notif->noa_active) { u32 len = le16_to_cpu(noa_notif->noa_attribute.length); u32 copylen = len; /* EID, len, OUI, subtype */ len += 1 + 1 + 3 + 1; /* P2P id, P2P length */ len += 1 + 2; copylen += 1 + 2; new_data = kmalloc(struct_size(new_data, data, len), GFP_ATOMIC); if (new_data) { new_data->length = len; new_data->data[0] = WLAN_EID_VENDOR_SPECIFIC; new_data->data[1] = len - 2; /* not counting EID, len */ new_data->data[2] = (WLAN_OUI_WFA >> 16) & 0xff; new_data->data[3] = (WLAN_OUI_WFA >> 8) & 0xff; new_data->data[4] = (WLAN_OUI_WFA >> 0) & 0xff; new_data->data[5] = WLAN_OUI_TYPE_WFA_P2P; memcpy(&new_data->data[6], &noa_notif->noa_attribute, copylen); } } else new_data = NULL; rcu_assign_pointer(priv->noa_data, new_data); if (old_data) kfree_rcu(old_data, rcu_head); } /* * iwl_setup_rx_handlers - Initialize Rx handler callbacks * * Setup the RX handlers for each of the reply types sent from the uCode * to the host. */ void iwl_setup_rx_handlers(struct iwl_priv *priv) { void (**handlers)(struct iwl_priv *priv, struct iwl_rx_cmd_buffer *rxb); handlers = priv->rx_handlers; handlers[REPLY_ERROR] = iwlagn_rx_reply_error; handlers[CHANNEL_SWITCH_NOTIFICATION] = iwlagn_rx_csa; handlers[SPECTRUM_MEASURE_NOTIFICATION] = iwlagn_rx_spectrum_measure_notif; handlers[PM_SLEEP_NOTIFICATION] = iwlagn_rx_pm_sleep_notif; handlers[PM_DEBUG_STATISTIC_NOTIFIC] = iwlagn_rx_pm_debug_statistics_notif; handlers[BEACON_NOTIFICATION] = iwlagn_rx_beacon_notif; handlers[REPLY_ADD_STA] = iwl_add_sta_callback; handlers[REPLY_WIPAN_NOA_NOTIFICATION] = iwlagn_rx_noa_notification; /* * The same handler is used for both the REPLY to a discrete * statistics request from the host as well as for the periodic * statistics notifications (after received beacons) from the uCode. */ handlers[REPLY_STATISTICS_CMD] = iwlagn_rx_reply_statistics; handlers[STATISTICS_NOTIFICATION] = iwlagn_rx_statistics; iwl_setup_rx_scan_handlers(priv); handlers[CARD_STATE_NOTIFICATION] = iwlagn_rx_card_state_notif; handlers[MISSED_BEACONS_NOTIFICATION] = iwlagn_rx_missed_beacon_notif; /* Rx handlers */ handlers[REPLY_RX_PHY_CMD] = iwlagn_rx_reply_rx_phy; handlers[REPLY_RX_MPDU_CMD] = iwlagn_rx_reply_rx; /* block ack */ handlers[REPLY_COMPRESSED_BA] = iwlagn_rx_reply_compressed_ba; priv->rx_handlers[REPLY_TX] = iwlagn_rx_reply_tx; /* set up notification wait support */ iwl_notification_wait_init(&priv->notif_wait); /* Set up BT Rx handlers */ if (priv->lib->bt_params) iwlagn_bt_rx_handler_setup(priv); } void iwl_rx_dispatch(struct iwl_op_mode *op_mode, struct napi_struct *napi, struct iwl_rx_cmd_buffer *rxb) { struct iwl_rx_packet *pkt = rxb_addr(rxb); struct iwl_priv *priv = IWL_OP_MODE_GET_DVM(op_mode); /* * Do the notification wait before RX handlers so * even if the RX handler consumes the RXB we have * access to it in the notification wait entry. */ iwl_notification_wait_notify(&priv->notif_wait, pkt); /* Based on type of command response or notification, * handle those that need handling via function in * rx_handlers table. See iwl_setup_rx_handlers() */ if (priv->rx_handlers[pkt->hdr.cmd]) { priv->rx_handlers_stats[pkt->hdr.cmd]++; priv->rx_handlers[pkt->hdr.cmd](priv, rxb); } else { /* No handling needed */ IWL_DEBUG_RX(priv, "No handler needed for %s, 0x%02x\n", iwl_get_cmd_string(priv->trans, WIDE_ID(0, pkt->hdr.cmd)), pkt->hdr.cmd); } }