/****************************************************************************** * * Copyright(c) 2003 - 2011 Intel Corporation. All rights reserved. * * Portions of this file are derived from the ipw3945 project, as well * as portions of the ieee80211 subsystem header files. * * This program is free software; you can redistribute it and/or modify it * under the terms of version 2 of the GNU General Public License as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for * more details. * * You should have received a copy of the GNU General Public License along with * this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA * * The full GNU General Public License is included in this distribution in the * file called LICENSE. * * Contact Information: * Intel Linux Wireless * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 * *****************************************************************************/ #include #include #include #include #include #include "iwl-eeprom.h" #include "iwl-dev.h" #include "iwl-core.h" #include "iwl-sta.h" #include "iwl-io.h" #include "iwl-helpers.h" #include "iwl-agn-calib.h" #include "iwl-agn.h" /****************************************************************************** * * RX path functions * ******************************************************************************/ /* * Rx theory of operation * * Driver allocates a circular buffer of Receive Buffer Descriptors (RBDs), * each of which point to Receive Buffers to be filled by the NIC. These get * used not only for Rx frames, but for any command response or notification * from the NIC. The driver and NIC manage the Rx buffers by means * of indexes into the circular buffer. * * Rx Queue Indexes * The host/firmware share two index registers for managing the Rx buffers. * * The READ index maps to the first position that the firmware may be writing * to -- the driver can read up to (but not including) this position and get * good data. * The READ index is managed by the firmware once the card is enabled. * * The WRITE index maps to the last position the driver has read from -- the * position preceding WRITE is the last slot the firmware can place a packet. * * The queue is empty (no good data) if WRITE = READ - 1, and is full if * WRITE = READ. * * During initialization, the host sets up the READ queue position to the first * INDEX position, and WRITE to the last (READ - 1 wrapped) * * When the firmware places a packet in a buffer, it will advance the READ index * and fire the RX interrupt. The driver can then query the READ index and * process as many packets as possible, moving the WRITE index forward as it * resets the Rx queue buffers with new memory. * * The management in the driver is as follows: * + A list of pre-allocated SKBs is stored in iwl->rxq->rx_free. When * iwl->rxq->free_count drops to or below RX_LOW_WATERMARK, work is scheduled * to replenish the iwl->rxq->rx_free. * + In iwl_rx_replenish (scheduled) if 'processed' != 'read' then the * iwl->rxq is replenished and the READ INDEX is updated (updating the * 'processed' and 'read' driver indexes as well) * + A received packet is processed and handed to the kernel network stack, * detached from the iwl->rxq. The driver 'processed' index is updated. * + The Host/Firmware iwl->rxq is replenished at tasklet time from the rx_free * list. If there are no allocated buffers in iwl->rxq->rx_free, the READ * INDEX is not incremented and iwl->status(RX_STALLED) is set. If there * were enough free buffers and RX_STALLED is set it is cleared. * * * Driver sequence: * * iwl_rx_queue_alloc() Allocates rx_free * iwl_rx_replenish() Replenishes rx_free list from rx_used, and calls * iwl_rx_queue_restock * iwl_rx_queue_restock() Moves available buffers from rx_free into Rx * queue, updates firmware pointers, and updates * the WRITE index. If insufficient rx_free buffers * are available, schedules iwl_rx_replenish * * -- enable interrupts -- * ISR - iwl_rx() Detach iwl_rx_mem_buffers from pool up to the * READ INDEX, detaching the SKB from the pool. * Moves the packet buffer from queue to rx_used. * Calls iwl_rx_queue_restock to refill any empty * slots. * ... * */ /** * iwl_rx_queue_space - Return number of free slots available in queue. */ int iwl_rx_queue_space(const struct iwl_rx_queue *q) { int s = q->read - q->write; if (s <= 0) s += RX_QUEUE_SIZE; /* keep some buffer to not confuse full and empty queue */ s -= 2; if (s < 0) s = 0; return s; } /** * iwl_rx_queue_update_write_ptr - Update the write pointer for the RX queue */ void iwl_rx_queue_update_write_ptr(struct iwl_priv *priv, struct iwl_rx_queue *q) { unsigned long flags; u32 rx_wrt_ptr_reg = priv->hw_params.rx_wrt_ptr_reg; u32 reg; spin_lock_irqsave(&q->lock, flags); if (q->need_update == 0) goto exit_unlock; if (priv->cfg->base_params->shadow_reg_enable) { /* shadow register enabled */ /* Device expects a multiple of 8 */ q->write_actual = (q->write & ~0x7); iwl_write32(priv, rx_wrt_ptr_reg, q->write_actual); } else { /* If power-saving is in use, make sure device is awake */ if (test_bit(STATUS_POWER_PMI, &priv->status)) { reg = iwl_read32(priv, CSR_UCODE_DRV_GP1); if (reg & CSR_UCODE_DRV_GP1_BIT_MAC_SLEEP) { IWL_DEBUG_INFO(priv, "Rx queue requesting wakeup," " GP1 = 0x%x\n", reg); iwl_set_bit(priv, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ); goto exit_unlock; } q->write_actual = (q->write & ~0x7); iwl_write_direct32(priv, rx_wrt_ptr_reg, q->write_actual); /* Else device is assumed to be awake */ } else { /* Device expects a multiple of 8 */ q->write_actual = (q->write & ~0x7); iwl_write_direct32(priv, rx_wrt_ptr_reg, q->write_actual); } } q->need_update = 0; exit_unlock: spin_unlock_irqrestore(&q->lock, flags); } /****************************************************************************** * * Generic RX handler implementations * ******************************************************************************/ static void iwl_rx_reply_error(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb) { struct iwl_rx_packet *pkt = rxb_addr(rxb); IWL_ERR(priv, "Error Reply type 0x%08X cmd %s (0x%02X) " "seq 0x%04X ser 0x%08X\n", le32_to_cpu(pkt->u.err_resp.error_type), get_cmd_string(pkt->u.err_resp.cmd_id), pkt->u.err_resp.cmd_id, le16_to_cpu(pkt->u.err_resp.bad_cmd_seq_num), le32_to_cpu(pkt->u.err_resp.error_info)); } static void iwl_rx_csa(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb) { struct iwl_rx_packet *pkt = rxb_addr(rxb); struct iwl_csa_notification *csa = &(pkt->u.csa_notif); /* * MULTI-FIXME * See iwl_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 iwl_rx_spectrum_measure_notif(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb) { struct iwl_rx_packet *pkt = rxb_addr(rxb); struct iwl_spectrum_notification *report = &(pkt->u.spectrum_notif); 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 iwl_rx_pm_sleep_notif(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb) { #ifdef CONFIG_IWLWIFI_DEBUG struct iwl_rx_packet *pkt = rxb_addr(rxb); struct iwl_sleep_notification *sleep = &(pkt->u.sleep_notif); IWL_DEBUG_RX(priv, "sleep mode: %d, src: %d\n", sleep->pm_sleep_mode, sleep->pm_wakeup_src); #endif } static void iwl_rx_pm_debug_statistics_notif(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb) { struct iwl_rx_packet *pkt = rxb_addr(rxb); u32 len = le32_to_cpu(pkt->len_n_flags) & FH_RSCSR_FRAME_SIZE_MSK; IWL_DEBUG_RADIO(priv, "Dumping %d bytes of unhandled " "notification for %s:\n", len, get_cmd_string(pkt->hdr.cmd)); iwl_print_hex_dump(priv, IWL_DL_RADIO, pkt->u.raw, len); } static void iwl_rx_beacon_notif(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb) { struct iwl_rx_packet *pkt = rxb_addr(rxb); struct iwlagn_beacon_notif *beacon = (void *)pkt->u.raw; #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); if (!test_bit(STATUS_EXIT_PENDING, &priv->status)) queue_work(priv->workqueue, &priv->beacon_update); } /* the threshold ratio of actual_ack_cnt to expected_ack_cnt in percent */ #define ACK_CNT_RATIO (50) #define BA_TIMEOUT_CNT (5) #define BA_TIMEOUT_MAX (16) /** * iwl_good_ack_health - checks for ACK count ratios, BA timeout retries. * * When the ACK count ratio is low and aggregated BA timeout retries exceeding * the BA_TIMEOUT_MAX, reload firmware and bring system back to normal * operation state. */ static bool iwl_good_ack_health(struct iwl_priv *priv, struct statistics_tx *cur) { int actual_delta, expected_delta, ba_timeout_delta; struct statistics_tx *old; if (priv->_agn.agg_tids_count) return true; old = &priv->statistics.tx; actual_delta = le32_to_cpu(cur->actual_ack_cnt) - le32_to_cpu(old->actual_ack_cnt); expected_delta = le32_to_cpu(cur->expected_ack_cnt) - le32_to_cpu(old->expected_ack_cnt); /* Values should not be negative, but we do not trust the firmware */ if (actual_delta <= 0 || expected_delta <= 0) return true; ba_timeout_delta = le32_to_cpu(cur->agg.ba_timeout) - le32_to_cpu(old->agg.ba_timeout); if ((actual_delta * 100 / expected_delta) < ACK_CNT_RATIO && ba_timeout_delta > BA_TIMEOUT_CNT) { IWL_DEBUG_RADIO(priv, "deltas: actual %d expected %d ba_timeout %d\n", actual_delta, expected_delta, ba_timeout_delta); #ifdef CONFIG_IWLWIFI_DEBUGFS /* * This is ifdef'ed on DEBUGFS because otherwise the * statistics aren't available. If DEBUGFS is set but * DEBUG is not, these will just compile out. */ IWL_DEBUG_RADIO(priv, "rx_detected_cnt delta %d\n", priv->delta_stats.tx.rx_detected_cnt); IWL_DEBUG_RADIO(priv, "ack_or_ba_timeout_collision delta %d\n", priv->delta_stats.tx.ack_or_ba_timeout_collision); #endif if (ba_timeout_delta >= BA_TIMEOUT_MAX) return false; } return true; } /** * 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 iwl_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->cfg->base_params->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; } static void iwl_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_mod_params.ack_check && !iwl_good_ack_health(priv, tx)) { IWL_ERR(priv, "low ack count detected, restart firmware\n"); if (!iwl_force_reset(priv, IWL_FW_RESET, false)) return; } if (iwlagn_mod_params.plcp_check && !iwl_good_plcp_health(priv, cur_ofdm, cur_ofdm_ht, msecs)) iwl_force_reset(priv, IWL_RF_RESET, 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 iwl_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 iwl_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 iwl_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 iwl_rx_statistics(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb) { unsigned long stamp = jiffies; const int reg_recalib_period = 60; int change; struct iwl_rx_packet *pkt = rxb_addr(rxb); u32 len = le32_to_cpu(pkt->len_n_flags) & FH_RSCSR_FRAME_SIZE_MSK; __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; len -= sizeof(struct iwl_cmd_header); /* skip header */ IWL_DEBUG_RX(priv, "Statistics notification received (%d bytes).\n", len); if (len == sizeof(struct iwl_bt_notif_statistics)) { struct iwl_bt_notif_statistics *stats; stats = &pkt->u.stats_bt; 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 = &pkt->u.stats; 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)); return; } change = common->temperature != priv->statistics.common.temperature || (*flag & STATISTICS_REPLY_FLG_HT40_MODE_MSK) != (priv->statistics.flag & STATISTICS_REPLY_FLG_HT40_MODE_MSK); iwl_accumulative_statistics(priv, common, rx_non_phy, rx_ofdm, rx_ofdm_ht, rx_cck, tx, bt_activity); iwl_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)) { iwl_rx_calc_noise(priv); queue_work(priv->workqueue, &priv->run_time_calib_work); } if (priv->cfg->ops->lib->temp_ops.temperature && change) priv->cfg->ops->lib->temp_ops.temperature(priv); } static void iwl_rx_reply_statistics(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb) { struct iwl_rx_packet *pkt = rxb_addr(rxb); if (le32_to_cpu(pkt->u.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"); } iwl_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 iwl_rx_card_state_notif(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb) { struct iwl_rx_packet *pkt = rxb_addr(rxb); u32 flags = le32_to_cpu(pkt->u.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, CSR_UCODE_DRV_GP1_SET, CSR_UCODE_DRV_GP1_BIT_CMD_BLOCKED); iwl_write_direct32(priv, HBUS_TARG_MBX_C, HBUS_TARG_MBX_C_REG_BIT_CMD_BLOCKED); if (!(flags & RXON_CARD_DISABLED)) { iwl_write32(priv, CSR_UCODE_DRV_GP1_CLR, CSR_UCODE_DRV_GP1_BIT_CMD_BLOCKED); iwl_write_direct32(priv, 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)); else wake_up_interruptible(&priv->wait_command_queue); } static void iwl_rx_missed_beacon_notif(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb) { struct iwl_rx_packet *pkt = rxb_addr(rxb); struct iwl_missed_beacon_notif *missed_beacon; missed_beacon = &pkt->u.missed_beacon; 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 iwl_rx_reply_rx_phy(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb) { struct iwl_rx_packet *pkt = rxb_addr(rxb); priv->_agn.last_phy_res_valid = true; memcpy(&priv->_agn.last_phy_res, pkt->u.raw, sizeof(struct iwl_rx_phy_res)); } /* * returns non-zero if packet should be dropped */ static int iwl_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; 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; } 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 iwl_pass_packet_to_mac80211(struct iwl_priv *priv, struct ieee80211_hdr *hdr, u16 len, u32 ampdu_status, struct iwl_rx_mem_buffer *rxb, struct ieee80211_rx_status *stats) { struct sk_buff *skb; __le16 fc = hdr->frame_control; struct iwl_rxon_context *ctx; /* 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 (!iwlagn_mod_params.sw_crypto && iwl_set_decrypted_flag(priv, hdr, ampdu_status, stats)) return; skb = dev_alloc_skb(128); if (!skb) { IWL_ERR(priv, "dev_alloc_skb failed\n"); return; } skb_add_rx_frag(skb, 0, rxb->page, (void *)hdr - rxb_addr(rxb), len); iwl_update_stats(priv, false, fc, len); /* * 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))) { for_each_context(priv, ctx) { if (!ctx->last_tx_rejected) continue; if (compare_ether_addr(hdr->addr3, ctx->active.bssid_addr)) continue; ctx->last_tx_rejected = false; iwl_wake_any_queue(priv, ctx); } } memcpy(IEEE80211_SKB_RXCB(skb), stats, sizeof(*stats)); ieee80211_rx(priv->hw, skb); rxb->page = NULL; } static u32 iwl_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; } /* fall through if TTAK OK */ 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; } /* Called for REPLY_RX (legacy ABG frames), or * REPLY_RX_MPDU_CMD (HT high-throughput N frames). */ static void iwl_rx_reply_rx(struct iwl_priv *priv, struct iwl_rx_mem_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; u32 ampdu_status; u32 rate_n_flags; /** * REPLY_RX and REPLY_RX_MPDU_CMD are handled differently. * REPLY_RX: physical layer info is in this buffer * REPLY_RX_MPDU_CMD: physical layer info was sent in separate * command and cached in priv->last_phy_res * * Here we set up local variables depending on which command is * received. */ if (pkt->hdr.cmd == REPLY_RX) { phy_res = (struct iwl_rx_phy_res *)pkt->u.raw; header = (struct ieee80211_hdr *)(pkt->u.raw + sizeof(*phy_res) + phy_res->cfg_phy_cnt); len = le16_to_cpu(phy_res->byte_count); rx_pkt_status = *(__le32 *)(pkt->u.raw + sizeof(*phy_res) + phy_res->cfg_phy_cnt + len); ampdu_status = le32_to_cpu(rx_pkt_status); } else { if (!priv->_agn.last_phy_res_valid) { IWL_ERR(priv, "MPDU frame without cached PHY data\n"); return; } phy_res = &priv->_agn.last_phy_res; amsdu = (struct iwl_rx_mpdu_res_start *)pkt->u.raw; header = (struct ieee80211_hdr *)(pkt->u.raw + sizeof(*amsdu)); len = le16_to_cpu(amsdu->byte_count); rx_pkt_status = *(__le32 *)(pkt->u.raw + sizeof(*amsdu) + len); ampdu_status = iwl_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) ? IEEE80211_BAND_2GHZ : IEEE80211_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_MPDU;*/ 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 = priv->cfg->ops->utils->calc_rssi(priv, phy_res); iwl_dbg_log_rx_data_frame(priv, len, header); 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.flag |= RX_FLAG_SHORTPRE; /* Set up the HT phy flags */ if (rate_n_flags & RATE_MCS_HT_MSK) rx_status.flag |= RX_FLAG_HT; if (rate_n_flags & RATE_MCS_HT40_MSK) rx_status.flag |= RX_FLAG_40MHZ; if (rate_n_flags & RATE_MCS_SGI_MSK) rx_status.flag |= RX_FLAG_SHORT_GI; iwl_pass_packet_to_mac80211(priv, header, len, ampdu_status, rxb, &rx_status); } /** * 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_mem_buffer *rxb); handlers = priv->rx_handlers; handlers[REPLY_ERROR] = iwl_rx_reply_error; handlers[CHANNEL_SWITCH_NOTIFICATION] = iwl_rx_csa; handlers[SPECTRUM_MEASURE_NOTIFICATION] = iwl_rx_spectrum_measure_notif; handlers[PM_SLEEP_NOTIFICATION] = iwl_rx_pm_sleep_notif; handlers[PM_DEBUG_STATISTIC_NOTIFIC] = iwl_rx_pm_debug_statistics_notif; handlers[BEACON_NOTIFICATION] = iwl_rx_beacon_notif; /* * 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] = iwl_rx_reply_statistics; handlers[STATISTICS_NOTIFICATION] = iwl_rx_statistics; iwl_setup_rx_scan_handlers(priv); handlers[CARD_STATE_NOTIFICATION] = iwl_rx_card_state_notif; handlers[MISSED_BEACONS_NOTIFICATION] = iwl_rx_missed_beacon_notif; /* Rx handlers */ handlers[REPLY_RX_PHY_CMD] = iwl_rx_reply_rx_phy; handlers[REPLY_RX_MPDU_CMD] = iwl_rx_reply_rx; /* block ack */ handlers[REPLY_COMPRESSED_BA] = iwlagn_rx_reply_compressed_ba; /* Set up hardware specific Rx handlers */ priv->cfg->ops->lib->rx_handler_setup(priv); }