| /****************************************************************************** |
| * |
| * 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 <ilw@linux.intel.com> |
| * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 |
| * |
| *****************************************************************************/ |
| |
| #include <linux/etherdevice.h> |
| #include <linux/slab.h> |
| #include <linux/sched.h> |
| #include <net/mac80211.h> |
| #include <asm/unaligned.h> |
| #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); |
| } |
| |
| int iwl_rx_queue_alloc(struct iwl_priv *priv) |
| { |
| struct iwl_rx_queue *rxq = &priv->rxq; |
| struct device *dev = priv->bus.dev; |
| int i; |
| |
| spin_lock_init(&rxq->lock); |
| INIT_LIST_HEAD(&rxq->rx_free); |
| INIT_LIST_HEAD(&rxq->rx_used); |
| |
| /* Alloc the circular buffer of Read Buffer Descriptors (RBDs) */ |
| rxq->bd = dma_alloc_coherent(dev, 4 * RX_QUEUE_SIZE, &rxq->bd_dma, |
| GFP_KERNEL); |
| if (!rxq->bd) |
| goto err_bd; |
| |
| rxq->rb_stts = dma_alloc_coherent(dev, sizeof(struct iwl_rb_status), |
| &rxq->rb_stts_dma, GFP_KERNEL); |
| if (!rxq->rb_stts) |
| goto err_rb; |
| |
| /* Fill the rx_used queue with _all_ of the Rx buffers */ |
| for (i = 0; i < RX_FREE_BUFFERS + RX_QUEUE_SIZE; i++) |
| list_add_tail(&rxq->pool[i].list, &rxq->rx_used); |
| |
| /* Set us so that we have processed and used all buffers, but have |
| * not restocked the Rx queue with fresh buffers */ |
| rxq->read = rxq->write = 0; |
| rxq->write_actual = 0; |
| rxq->free_count = 0; |
| rxq->need_update = 0; |
| return 0; |
| |
| err_rb: |
| dma_free_coherent(dev, 4 * RX_QUEUE_SIZE, rxq->bd, |
| rxq->bd_dma); |
| err_bd: |
| return -ENOMEM; |
| } |
| |
| /****************************************************************************** |
| * |
| * 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); |
| } |