rx.c

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/******************************************************************************
 *
 * Copyright(c) 2003 - 2012 Intel Corporation. All rights reserved.
 *
 * Portions of this file are derived from the ipw3945 project, as well
 * as portionhelp 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 <[email protected]>
 * 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-io.h"
#include "dev.h"
#include "calib.h"
#include "agn.h"

#define IWL_CMD_ENTRY(x) [x] = #x

const char *iwl_dvm_cmd_strings[REPLY_MAX] = {
    IWL_CMD_ENTRY(REPLY_ALIVE),
    IWL_CMD_ENTRY(REPLY_ERROR),
    IWL_CMD_ENTRY(REPLY_ECHO),
    IWL_CMD_ENTRY(REPLY_RXON),
    IWL_CMD_ENTRY(REPLY_RXON_ASSOC),
    IWL_CMD_ENTRY(REPLY_QOS_PARAM),
    IWL_CMD_ENTRY(REPLY_RXON_TIMING),
    IWL_CMD_ENTRY(REPLY_ADD_STA),
    IWL_CMD_ENTRY(REPLY_REMOVE_STA),
    IWL_CMD_ENTRY(REPLY_REMOVE_ALL_STA),
    IWL_CMD_ENTRY(REPLY_TXFIFO_FLUSH),
    IWL_CMD_ENTRY(REPLY_WEPKEY),
    IWL_CMD_ENTRY(REPLY_TX),
    IWL_CMD_ENTRY(REPLY_LEDS_CMD),
    IWL_CMD_ENTRY(REPLY_TX_LINK_QUALITY_CMD),
    IWL_CMD_ENTRY(COEX_PRIORITY_TABLE_CMD),
    IWL_CMD_ENTRY(COEX_MEDIUM_NOTIFICATION),
    IWL_CMD_ENTRY(COEX_EVENT_CMD),
    IWL_CMD_ENTRY(REPLY_QUIET_CMD),
    IWL_CMD_ENTRY(REPLY_CHANNEL_SWITCH),
    IWL_CMD_ENTRY(CHANNEL_SWITCH_NOTIFICATION),
    IWL_CMD_ENTRY(REPLY_SPECTRUM_MEASUREMENT_CMD),
    IWL_CMD_ENTRY(SPECTRUM_MEASURE_NOTIFICATION),
    IWL_CMD_ENTRY(POWER_TABLE_CMD),
    IWL_CMD_ENTRY(PM_SLEEP_NOTIFICATION),
    IWL_CMD_ENTRY(PM_DEBUG_STATISTIC_NOTIFIC),
    IWL_CMD_ENTRY(REPLY_SCAN_CMD),
    IWL_CMD_ENTRY(REPLY_SCAN_ABORT_CMD),
    IWL_CMD_ENTRY(SCAN_START_NOTIFICATION),
    IWL_CMD_ENTRY(SCAN_RESULTS_NOTIFICATION),
    IWL_CMD_ENTRY(SCAN_COMPLETE_NOTIFICATION),
    IWL_CMD_ENTRY(BEACON_NOTIFICATION),
    IWL_CMD_ENTRY(REPLY_TX_BEACON),
    IWL_CMD_ENTRY(WHO_IS_AWAKE_NOTIFICATION),
    IWL_CMD_ENTRY(QUIET_NOTIFICATION),
    IWL_CMD_ENTRY(REPLY_TX_PWR_TABLE_CMD),
    IWL_CMD_ENTRY(MEASURE_ABORT_NOTIFICATION),
    IWL_CMD_ENTRY(REPLY_BT_CONFIG),
    IWL_CMD_ENTRY(REPLY_STATISTICS_CMD),
    IWL_CMD_ENTRY(STATISTICS_NOTIFICATION),
    IWL_CMD_ENTRY(REPLY_CARD_STATE_CMD),
    IWL_CMD_ENTRY(CARD_STATE_NOTIFICATION),
    IWL_CMD_ENTRY(MISSED_BEACONS_NOTIFICATION),
    IWL_CMD_ENTRY(REPLY_CT_KILL_CONFIG_CMD),
    IWL_CMD_ENTRY(SENSITIVITY_CMD),
    IWL_CMD_ENTRY(REPLY_PHY_CALIBRATION_CMD),
    IWL_CMD_ENTRY(REPLY_RX_PHY_CMD),
    IWL_CMD_ENTRY(REPLY_RX_MPDU_CMD),
    IWL_CMD_ENTRY(REPLY_COMPRESSED_BA),
    IWL_CMD_ENTRY(CALIBRATION_CFG_CMD),
    IWL_CMD_ENTRY(CALIBRATION_RES_NOTIFICATION),
    IWL_CMD_ENTRY(CALIBRATION_COMPLETE_NOTIFICATION),
    IWL_CMD_ENTRY(REPLY_TX_POWER_DBM_CMD),
    IWL_CMD_ENTRY(TEMPERATURE_NOTIFICATION),
    IWL_CMD_ENTRY(TX_ANT_CONFIGURATION_CMD),
    IWL_CMD_ENTRY(REPLY_BT_COEX_PROFILE_NOTIF),
    IWL_CMD_ENTRY(REPLY_BT_COEX_PRIO_TABLE),
    IWL_CMD_ENTRY(REPLY_BT_COEX_PROT_ENV),
    IWL_CMD_ENTRY(REPLY_WIPAN_PARAMS),
    IWL_CMD_ENTRY(REPLY_WIPAN_RXON),
    IWL_CMD_ENTRY(REPLY_WIPAN_RXON_TIMING),
    IWL_CMD_ENTRY(REPLY_WIPAN_RXON_ASSOC),
    IWL_CMD_ENTRY(REPLY_WIPAN_QOS_PARAM),
    IWL_CMD_ENTRY(REPLY_WIPAN_WEPKEY),
    IWL_CMD_ENTRY(REPLY_WIPAN_P2P_CHANNEL_SWITCH),
    IWL_CMD_ENTRY(REPLY_WIPAN_NOA_NOTIFICATION),
    IWL_CMD_ENTRY(REPLY_WIPAN_DEACTIVATION_COMPLETE),
    IWL_CMD_ENTRY(REPLY_WOWLAN_PATTERNS),
    IWL_CMD_ENTRY(REPLY_WOWLAN_WAKEUP_FILTER),
    IWL_CMD_ENTRY(REPLY_WOWLAN_TSC_RSC_PARAMS),
    IWL_CMD_ENTRY(REPLY_WOWLAN_TKIP_PARAMS),
    IWL_CMD_ENTRY(REPLY_WOWLAN_KEK_KCK_MATERIAL),
    IWL_CMD_ENTRY(REPLY_WOWLAN_GET_STATUS),
    IWL_CMD_ENTRY(REPLY_D3_CONFIG),
};
#undef IWL_CMD_ENTRY

/******************************************************************************
 *
 * Generic RX handler implementations
 *
 ******************************************************************************/

static int iwlagn_rx_reply_error(struct iwl_priv *priv,
                   struct iwl_rx_cmd_buffer *rxb,
                   struct iwl_device_cmd *cmd)
{
    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));
    return 0;
}

static int iwlagn_rx_csa(struct iwl_priv *priv, struct iwl_rx_cmd_buffer *rxb,
                   struct iwl_device_cmd *cmd)
{
    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 0;

    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);
    }
    return 0;
}


static int iwlagn_rx_spectrum_measure_notif(struct iwl_priv *priv,
                      struct iwl_rx_cmd_buffer *rxb,
                      struct iwl_device_cmd *cmd)
{
    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 0;
    }

    memcpy(&priv->measure_report, report, sizeof(*report));
    priv->measurement_status |= MEASUREMENT_READY;
    return 0;
}

static int iwlagn_rx_pm_sleep_notif(struct iwl_priv *priv,
                  struct iwl_rx_cmd_buffer *rxb,
                  struct iwl_device_cmd *cmd)
{
#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
    return 0;
}

static int iwlagn_rx_pm_debug_statistics_notif(struct iwl_priv *priv,
                         struct iwl_rx_cmd_buffer *rxb,
                         struct iwl_device_cmd *cmd)
{
    struct iwl_rx_packet *pkt = rxb_addr(rxb);
    u32 __maybe_unused len =
        le32_to_cpu(pkt->len_n_flags) & FH_RSCSR_FRAME_SIZE_MSK;
    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);
    return 0;
}

static int iwlagn_rx_beacon_notif(struct iwl_priv *priv,
                struct iwl_rx_cmd_buffer *rxb,
                struct iwl_device_cmd *cmd)
{
    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);

    return 0;
}

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 (iwlwifi_mod_params.plcp_check &&
        !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 int iwlagn_rx_statistics(struct iwl_priv *priv,
                  struct iwl_rx_cmd_buffer *rxb,
                  struct iwl_device_cmd *cmd)
{
    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);

    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 0;
    }

    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);

    return 0;
}

static int iwlagn_rx_reply_statistics(struct iwl_priv *priv,
                    struct iwl_rx_cmd_buffer *rxb,
                    struct iwl_device_cmd *cmd)
{
    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, cmd);
    return 0;
}

/* Handle notification from uCode that card's power state is changing
 * due to software, hardware, or critical temperature RFKILL */
static int iwlagn_rx_card_state_notif(struct iwl_priv *priv,
                    struct iwl_rx_cmd_buffer *rxb,
                    struct iwl_device_cmd *cmd)
{
    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));
    else
        wake_up(&priv->trans->wait_command_queue);
    return 0;
}

static int iwlagn_rx_missed_beacon_notif(struct iwl_priv *priv,
                       struct iwl_rx_cmd_buffer *rxb,
                       struct iwl_device_cmd *cmd)

{
    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);
    }
    return 0;
}

/* 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 int iwlagn_rx_reply_rx_phy(struct iwl_priv *priv,
                struct iwl_rx_cmd_buffer *rxb,
                struct iwl_device_cmd *cmd)
{
    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));
    return 0;
}

/*
 * 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;

    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 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.sw_crypto &&
        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);

    memcpy(skb_put(skb, hdrlen), 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(priv->hw, skb);
}

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;
        }
        /* 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;
}

/* 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 int iwlagn_rx_reply_rx(struct iwl_priv *priv,
                struct iwl_rx_cmd_buffer *rxb,
                struct iwl_device_cmd *cmd)
{
    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;

    if (!priv->last_phy_res_valid) {
        IWL_ERR(priv, "MPDU frame without cached PHY data\n");
        return 0;
    }
    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);
    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 0;
    }

    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 0;
    }

    /* 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 = 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.flag |= RX_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.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;
    if (rate_n_flags & RATE_MCS_GF_MSK)
        rx_status.flag |= RX_FLAG_HT_GF;

    iwlagn_pass_packet_to_mac80211(priv, header, len, ampdu_status,
                    rxb, &rx_status);
    return 0;
}

static int iwlagn_rx_noa_notification(struct iwl_priv *priv,
                      struct iwl_rx_cmd_buffer *rxb,
                      struct iwl_device_cmd *cmd)
{
    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(sizeof(*new_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);

    return 0;
}

void iwl_setup_rx_handlers(struct iwl_priv *priv)
{
    int (**handlers)(struct iwl_priv *priv, struct iwl_rx_cmd_buffer *rxb,
                   struct iwl_device_cmd *cmd);

    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->cfg->bt_params)
        iwlagn_bt_rx_handler_setup(priv);
}

int iwl_rx_dispatch(struct iwl_op_mode *op_mode, struct iwl_rx_cmd_buffer *rxb,
            struct iwl_device_cmd *cmd)
{
    struct iwl_rx_packet *pkt = rxb_addr(rxb);
    struct iwl_priv *priv = IWL_OP_MODE_GET_DVM(op_mode);
    int err = 0;

    /*
     * 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);

#ifdef CONFIG_IWLWIFI_DEVICE_TESTMODE
    /*
     * RX data may be forwarded to userspace in one
     * of two cases: the user owns the fw through testmode or when
     * the user requested to monitor the rx w/o affecting the regular flow.
     * In these cases the iwl_test object will handle forwarding the rx
     * data to user space.
     * Note that if the ownership flag != IWL_OWNERSHIP_TM the flow
     * continues.
     */
    iwl_test_rx(&priv->tst, rxb);
#endif

    if (priv->ucode_owner != IWL_OWNERSHIP_TM) {
        /* 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]++;
            err = priv->rx_handlers[pkt->hdr.cmd] (priv, rxb, cmd);
        } else {
            /* No handling needed */
            IWL_DEBUG_RX(priv, "No handler needed for %s, 0x%02x\n",
                     iwl_dvm_get_cmd_string(pkt->hdr.cmd),
                     pkt->hdr.cmd);
        }
    }
    return err;
}