main.c

Go to the documentation of this file.

/*
 * Copyright (c) 2004-2011 Atheros Communications Inc.
 * Copyright (c) 2011-2012 Qualcomm Atheros, Inc.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include "core.h"
#include "hif-ops.h"
#include "cfg80211.h"
#include "target.h"
#include "debug.h"

struct ath6kl_sta *ath6kl_find_sta(struct ath6kl_vif *vif, u8 *node_addr)
{
    struct ath6kl *ar = vif->ar;
    struct ath6kl_sta *conn = NULL;
    u8 i, max_conn;

    max_conn = (vif->nw_type == AP_NETWORK) ? AP_MAX_NUM_STA : 0;

    for (i = 0; i < max_conn; i++) {
        if (memcmp(node_addr, ar->sta_list[i].mac, ETH_ALEN) == 0) {
            conn = &ar->sta_list[i];
            break;
        }
    }

    return conn;
}

struct ath6kl_sta *ath6kl_find_sta_by_aid(struct ath6kl *ar, u8 aid)
{
    struct ath6kl_sta *conn = NULL;
    u8 ctr;

    for (ctr = 0; ctr < AP_MAX_NUM_STA; ctr++) {
        if (ar->sta_list[ctr].aid == aid) {
            conn = &ar->sta_list[ctr];
            break;
        }
    }
    return conn;
}

static void ath6kl_add_new_sta(struct ath6kl_vif *vif, u8 *mac, u16 aid,
                   u8 *wpaie, size_t ielen, u8 keymgmt,
                   u8 ucipher, u8 auth, u8 apsd_info)
{
    struct ath6kl *ar = vif->ar;
    struct ath6kl_sta *sta;
    u8 free_slot;

    free_slot = aid - 1;

    sta = &ar->sta_list[free_slot];
    memcpy(sta->mac, mac, ETH_ALEN);
    if (ielen <= ATH6KL_MAX_IE)
        memcpy(sta->wpa_ie, wpaie, ielen);
    sta->aid = aid;
    sta->keymgmt = keymgmt;
    sta->ucipher = ucipher;
    sta->auth = auth;
    sta->apsd_info = apsd_info;

    ar->sta_list_index = ar->sta_list_index | (1 << free_slot);
    ar->ap_stats.sta[free_slot].aid = cpu_to_le32(aid);
    aggr_conn_init(vif, vif->aggr_cntxt, sta->aggr_conn);
}

static void ath6kl_sta_cleanup(struct ath6kl *ar, u8 i)
{
    struct ath6kl_sta *sta = &ar->sta_list[i];
    struct ath6kl_mgmt_buff *entry, *tmp;

    /* empty the queued pkts in the PS queue if any */
    spin_lock_bh(&sta->psq_lock);
    skb_queue_purge(&sta->psq);
    skb_queue_purge(&sta->apsdq);

    if (sta->mgmt_psq_len != 0) {
        list_for_each_entry_safe(entry, tmp, &sta->mgmt_psq, list) {
            kfree(entry);
        }
        INIT_LIST_HEAD(&sta->mgmt_psq);
        sta->mgmt_psq_len = 0;
    }

    spin_unlock_bh(&sta->psq_lock);

    memset(&ar->ap_stats.sta[sta->aid - 1], 0,
           sizeof(struct wmi_per_sta_stat));
    memset(sta->mac, 0, ETH_ALEN);
    memset(sta->wpa_ie, 0, ATH6KL_MAX_IE);
    sta->aid = 0;
    sta->sta_flags = 0;

    ar->sta_list_index = ar->sta_list_index & ~(1 << i);
    aggr_reset_state(sta->aggr_conn);
}

static u8 ath6kl_remove_sta(struct ath6kl *ar, u8 *mac, u16 reason)
{
    u8 i, removed = 0;

    if (is_zero_ether_addr(mac))
        return removed;

    if (is_broadcast_ether_addr(mac)) {
        ath6kl_dbg(ATH6KL_DBG_TRC, "deleting all station\n");

        for (i = 0; i < AP_MAX_NUM_STA; i++) {
            if (!is_zero_ether_addr(ar->sta_list[i].mac)) {
                ath6kl_sta_cleanup(ar, i);
                removed = 1;
            }
        }
    } else {
        for (i = 0; i < AP_MAX_NUM_STA; i++) {
            if (memcmp(ar->sta_list[i].mac, mac, ETH_ALEN) == 0) {
                ath6kl_dbg(ATH6KL_DBG_TRC,
                       "deleting station %pM aid=%d reason=%d\n",
                       mac, ar->sta_list[i].aid, reason);
                ath6kl_sta_cleanup(ar, i);
                removed = 1;
                break;
            }
        }
    }

    return removed;
}

enum htc_endpoint_id ath6kl_ac2_endpoint_id(void *devt, u8 ac)
{
    struct ath6kl *ar = devt;
    return ar->ac2ep_map[ac];
}

struct ath6kl_cookie *ath6kl_alloc_cookie(struct ath6kl *ar)
{
    struct ath6kl_cookie *cookie;

    cookie = ar->cookie_list;
    if (cookie != NULL) {
        ar->cookie_list = cookie->arc_list_next;
        ar->cookie_count--;
    }

    return cookie;
}

void ath6kl_cookie_init(struct ath6kl *ar)
{
    u32 i;

    ar->cookie_list = NULL;
    ar->cookie_count = 0;

    memset(ar->cookie_mem, 0, sizeof(ar->cookie_mem));

    for (i = 0; i < MAX_COOKIE_NUM; i++)
        ath6kl_free_cookie(ar, &ar->cookie_mem[i]);
}

void ath6kl_cookie_cleanup(struct ath6kl *ar)
{
    ar->cookie_list = NULL;
    ar->cookie_count = 0;
}

void ath6kl_free_cookie(struct ath6kl *ar, struct ath6kl_cookie *cookie)
{
    /* Insert first */

    if (!ar || !cookie)
        return;

    cookie->arc_list_next = ar->cookie_list;
    ar->cookie_list = cookie;
    ar->cookie_count++;
}

/*
 * Read from the hardware through its diagnostic window. No cooperation
 * from the firmware is required for this.
 */
int ath6kl_diag_read32(struct ath6kl *ar, u32 address, u32 *value)
{
    int ret;

    ret = ath6kl_hif_diag_read32(ar, address, value);
    if (ret) {
        ath6kl_warn("failed to read32 through diagnose window: %d\n",
                ret);
        return ret;
    }

    return 0;
}

/*
 * Write to the ATH6KL through its diagnostic window. No cooperation from
 * the Target is required for this.
 */
int ath6kl_diag_write32(struct ath6kl *ar, u32 address, __le32 value)
{
    int ret;

    ret = ath6kl_hif_diag_write32(ar, address, value);

    if (ret) {
        ath6kl_err("failed to write 0x%x during diagnose window to 0x%d\n",
               address, value);
        return ret;
    }

    return 0;
}

int ath6kl_diag_read(struct ath6kl *ar, u32 address, void *data, u32 length)
{
    u32 count, *buf = data;
    int ret;

    if (WARN_ON(length % 4))
        return -EINVAL;

    for (count = 0; count < length / 4; count++, address += 4) {
        ret = ath6kl_diag_read32(ar, address, &buf[count]);
        if (ret)
            return ret;
    }

    return 0;
}

int ath6kl_diag_write(struct ath6kl *ar, u32 address, void *data, u32 length)
{
    u32 count;
    __le32 *buf = data;
    int ret;

    if (WARN_ON(length % 4))
        return -EINVAL;

    for (count = 0; count < length / 4; count++, address += 4) {
        ret = ath6kl_diag_write32(ar, address, buf[count]);
        if (ret)
            return ret;
    }

    return 0;
}

int ath6kl_read_fwlogs(struct ath6kl *ar)
{
    struct ath6kl_dbglog_hdr debug_hdr;
    struct ath6kl_dbglog_buf debug_buf;
    u32 address, length, dropped, firstbuf, debug_hdr_addr;
    int ret, loop;
    u8 *buf;

    buf = kmalloc(ATH6KL_FWLOG_PAYLOAD_SIZE, GFP_KERNEL);
    if (!buf)
        return -ENOMEM;

    address = TARG_VTOP(ar->target_type,
                ath6kl_get_hi_item_addr(ar,
                            HI_ITEM(hi_dbglog_hdr)));

    ret = ath6kl_diag_read32(ar, address, &debug_hdr_addr);
    if (ret)
        goto out;

    /* Get the contents of the ring buffer */
    if (debug_hdr_addr == 0) {
        ath6kl_warn("Invalid address for debug_hdr_addr\n");
        ret = -EINVAL;
        goto out;
    }

    address = TARG_VTOP(ar->target_type, debug_hdr_addr);
    ath6kl_diag_read(ar, address, &debug_hdr, sizeof(debug_hdr));

    address = TARG_VTOP(ar->target_type,
                le32_to_cpu(debug_hdr.dbuf_addr));
    firstbuf = address;
    dropped = le32_to_cpu(debug_hdr.dropped);
    ath6kl_diag_read(ar, address, &debug_buf, sizeof(debug_buf));

    loop = 100;

    do {
        address = TARG_VTOP(ar->target_type,
                    le32_to_cpu(debug_buf.buffer_addr));
        length = le32_to_cpu(debug_buf.length);

        if (length != 0 && (le32_to_cpu(debug_buf.length) <=
                    le32_to_cpu(debug_buf.bufsize))) {
            length = ALIGN(length, 4);

            ret = ath6kl_diag_read(ar, address,
                           buf, length);
            if (ret)
                goto out;

            ath6kl_debug_fwlog_event(ar, buf, length);
        }

        address = TARG_VTOP(ar->target_type,
                    le32_to_cpu(debug_buf.next));
        ath6kl_diag_read(ar, address, &debug_buf, sizeof(debug_buf));
        if (ret)
            goto out;

        loop--;

        if (WARN_ON(loop == 0)) {
            ret = -ETIMEDOUT;
            goto out;
        }
    } while (address != firstbuf);

out:
    kfree(buf);

    return ret;
}

/* FIXME: move to a better place, target.h? */
#define AR6003_RESET_CONTROL_ADDRESS 0x00004000
#define AR6004_RESET_CONTROL_ADDRESS 0x00004000

void ath6kl_reset_device(struct ath6kl *ar, u32 target_type,
             bool wait_fot_compltn, bool cold_reset)
{
    int status = 0;
    u32 address;
    __le32 data;

    if (target_type != TARGET_TYPE_AR6003 &&
        target_type != TARGET_TYPE_AR6004)
        return;

    data = cold_reset ? cpu_to_le32(RESET_CONTROL_COLD_RST) :
                cpu_to_le32(RESET_CONTROL_MBOX_RST);

    switch (target_type) {
    case TARGET_TYPE_AR6003:
        address = AR6003_RESET_CONTROL_ADDRESS;
        break;
    case TARGET_TYPE_AR6004:
        address = AR6004_RESET_CONTROL_ADDRESS;
        break;
    }

    status = ath6kl_diag_write32(ar, address, data);

    if (status)
        ath6kl_err("failed to reset target\n");
}

static void ath6kl_install_static_wep_keys(struct ath6kl_vif *vif)
{
    u8 index;
    u8 keyusage;

    for (index = 0; index <= WMI_MAX_KEY_INDEX; index++) {
        if (vif->wep_key_list[index].key_len) {
            keyusage = GROUP_USAGE;
            if (index == vif->def_txkey_index)
                keyusage |= TX_USAGE;

            ath6kl_wmi_addkey_cmd(vif->ar->wmi, vif->fw_vif_idx,
                          index,
                          WEP_CRYPT,
                          keyusage,
                          vif->wep_key_list[index].key_len,
                          NULL, 0,
                          vif->wep_key_list[index].key,
                          KEY_OP_INIT_VAL, NULL,
                          NO_SYNC_WMIFLAG);
        }
    }
}

void ath6kl_connect_ap_mode_bss(struct ath6kl_vif *vif, u16 channel)
{
    struct ath6kl *ar = vif->ar;
    struct ath6kl_req_key *ik;
    int res;
    u8 key_rsc[ATH6KL_KEY_SEQ_LEN];

    ik = &ar->ap_mode_bkey;

    ath6kl_dbg(ATH6KL_DBG_WLAN_CFG, "AP mode started on %u MHz\n", channel);

    switch (vif->auth_mode) {
    case NONE_AUTH:
        if (vif->prwise_crypto == WEP_CRYPT)
            ath6kl_install_static_wep_keys(vif);
        if (!ik->valid || ik->key_type != WAPI_CRYPT)
            break;
        /* for WAPI, we need to set the delayed group key, continue: */
    case WPA_PSK_AUTH:
    case WPA2_PSK_AUTH:
    case (WPA_PSK_AUTH | WPA2_PSK_AUTH):
        if (!ik->valid)
            break;

        ath6kl_dbg(ATH6KL_DBG_WLAN_CFG,
               "Delayed addkey for the initial group key for AP mode\n");
        memset(key_rsc, 0, sizeof(key_rsc));
        res = ath6kl_wmi_addkey_cmd(
            ar->wmi, vif->fw_vif_idx, ik->key_index, ik->key_type,
            GROUP_USAGE, ik->key_len, key_rsc, ATH6KL_KEY_SEQ_LEN,
            ik->key,
            KEY_OP_INIT_VAL, NULL, SYNC_BOTH_WMIFLAG);
        if (res) {
            ath6kl_dbg(ATH6KL_DBG_WLAN_CFG,
                   "Delayed addkey failed: %d\n", res);
        }
        break;
    }

    if (ar->want_ch_switch & (1 << vif->fw_vif_idx)) {
        ar->want_ch_switch &= ~(1 << vif->fw_vif_idx);
        /* we actually don't know the phymode, default to HT20 */
        ath6kl_cfg80211_ch_switch_notify(vif, channel,
                         WMI_11G_HT20);
    }

    ath6kl_wmi_bssfilter_cmd(ar->wmi, vif->fw_vif_idx, NONE_BSS_FILTER, 0);
    set_bit(CONNECTED, &vif->flags);
    netif_carrier_on(vif->ndev);
}

void ath6kl_connect_ap_mode_sta(struct ath6kl_vif *vif, u16 aid, u8 *mac_addr,
                u8 keymgmt, u8 ucipher, u8 auth,
                u8 assoc_req_len, u8 *assoc_info, u8 apsd_info)
{
    u8 *ies = NULL, *wpa_ie = NULL, *pos;
    size_t ies_len = 0;
    struct station_info sinfo;

    ath6kl_dbg(ATH6KL_DBG_TRC, "new station %pM aid=%d\n", mac_addr, aid);

    if (assoc_req_len > sizeof(struct ieee80211_hdr_3addr)) {
        struct ieee80211_mgmt *mgmt =
            (struct ieee80211_mgmt *) assoc_info;
        if (ieee80211_is_assoc_req(mgmt->frame_control) &&
            assoc_req_len >= sizeof(struct ieee80211_hdr_3addr) +
            sizeof(mgmt->u.assoc_req)) {
            ies = mgmt->u.assoc_req.variable;
            ies_len = assoc_info + assoc_req_len - ies;
        } else if (ieee80211_is_reassoc_req(mgmt->frame_control) &&
               assoc_req_len >= sizeof(struct ieee80211_hdr_3addr)
               + sizeof(mgmt->u.reassoc_req)) {
            ies = mgmt->u.reassoc_req.variable;
            ies_len = assoc_info + assoc_req_len - ies;
        }
    }

    pos = ies;
    while (pos && pos + 1 < ies + ies_len) {
        if (pos + 2 + pos[1] > ies + ies_len)
            break;
        if (pos[0] == WLAN_EID_RSN)
            wpa_ie = pos; /* RSN IE */
        else if (pos[0] == WLAN_EID_VENDOR_SPECIFIC &&
             pos[1] >= 4 &&
             pos[2] == 0x00 && pos[3] == 0x50 && pos[4] == 0xf2) {
            if (pos[5] == 0x01)
                wpa_ie = pos; /* WPA IE */
            else if (pos[5] == 0x04) {
                wpa_ie = pos; /* WPS IE */
                break; /* overrides WPA/RSN IE */
            }
        } else if (pos[0] == 0x44 && wpa_ie == NULL) {
            /*
             * Note: WAPI Parameter Set IE re-uses Element ID that
             * was officially allocated for BSS AC Access Delay. As
             * such, we need to be a bit more careful on when
             * parsing the frame. However, BSS AC Access Delay
             * element is not supposed to be included in
             * (Re)Association Request frames, so this should not
             * cause problems.
             */
            wpa_ie = pos; /* WAPI IE */
            break;
        }
        pos += 2 + pos[1];
    }

    ath6kl_add_new_sta(vif, mac_addr, aid, wpa_ie,
               wpa_ie ? 2 + wpa_ie[1] : 0,
               keymgmt, ucipher, auth, apsd_info);

    /* send event to application */
    memset(&sinfo, 0, sizeof(sinfo));

    /* TODO: sinfo.generation */

    sinfo.assoc_req_ies = ies;
    sinfo.assoc_req_ies_len = ies_len;
    sinfo.filled |= STATION_INFO_ASSOC_REQ_IES;

    cfg80211_new_sta(vif->ndev, mac_addr, &sinfo, GFP_KERNEL);

    netif_wake_queue(vif->ndev);
}

void disconnect_timer_handler(unsigned long ptr)
{
    struct net_device *dev = (struct net_device *)ptr;
    struct ath6kl_vif *vif = netdev_priv(dev);

    ath6kl_init_profile_info(vif);
    ath6kl_disconnect(vif);
}

void ath6kl_disconnect(struct ath6kl_vif *vif)
{
    if (test_bit(CONNECTED, &vif->flags) ||
        test_bit(CONNECT_PEND, &vif->flags)) {
        ath6kl_wmi_disconnect_cmd(vif->ar->wmi, vif->fw_vif_idx);
        /*
         * Disconnect command is issued, clear the connect pending
         * flag. The connected flag will be cleared in
         * disconnect event notification.
         */
        clear_bit(CONNECT_PEND, &vif->flags);
    }
}

/* WMI Event handlers */

void ath6kl_ready_event(void *devt, u8 *datap, u32 sw_ver, u32 abi_ver,
            enum wmi_phy_cap cap)
{
    struct ath6kl *ar = devt;

    memcpy(ar->mac_addr, datap, ETH_ALEN);

    ath6kl_dbg(ATH6KL_DBG_BOOT,
           "ready event mac addr %pM sw_ver 0x%x abi_ver 0x%x cap 0x%x\n",
           ar->mac_addr, sw_ver, abi_ver, cap);

    ar->version.wlan_ver = sw_ver;
    ar->version.abi_ver = abi_ver;
    ar->hw.cap = cap;

    if (strlen(ar->wiphy->fw_version) == 0) {
        snprintf(ar->wiphy->fw_version,
             sizeof(ar->wiphy->fw_version),
             "%u.%u.%u.%u",
             (ar->version.wlan_ver & 0xf0000000) >> 28,
             (ar->version.wlan_ver & 0x0f000000) >> 24,
             (ar->version.wlan_ver & 0x00ff0000) >> 16,
             (ar->version.wlan_ver & 0x0000ffff));
    }

    /* indicate to the waiting thread that the ready event was received */
    set_bit(WMI_READY, &ar->flag);
    wake_up(&ar->event_wq);
}

void ath6kl_scan_complete_evt(struct ath6kl_vif *vif, int status)
{
    struct ath6kl *ar = vif->ar;
    bool aborted = false;

    if (status != WMI_SCAN_STATUS_SUCCESS)
        aborted = true;

    ath6kl_cfg80211_scan_complete_event(vif, aborted);

    if (!ar->usr_bss_filter) {
        clear_bit(CLEAR_BSSFILTER_ON_BEACON, &vif->flags);
        ath6kl_wmi_bssfilter_cmd(ar->wmi, vif->fw_vif_idx,
                     NONE_BSS_FILTER, 0);
    }

    ath6kl_dbg(ATH6KL_DBG_WLAN_CFG, "scan complete: %d\n", status);
}

static int ath6kl_commit_ch_switch(struct ath6kl_vif *vif, u16 channel)
{

    struct ath6kl *ar = vif->ar;

    vif->profile.ch = cpu_to_le16(channel);

    switch (vif->nw_type) {
    case AP_NETWORK:
        return ath6kl_wmi_ap_profile_commit(ar->wmi, vif->fw_vif_idx,
                            &vif->profile);
    default:
        ath6kl_err("won't switch channels nw_type=%d\n", vif->nw_type);
        return -ENOTSUPP;
    }
}

static void ath6kl_check_ch_switch(struct ath6kl *ar, u16 channel)
{

    struct ath6kl_vif *vif;
    int res = 0;

    if (!ar->want_ch_switch)
        return;

    spin_lock_bh(&ar->list_lock);
    list_for_each_entry(vif, &ar->vif_list, list) {
        if (ar->want_ch_switch & (1 << vif->fw_vif_idx))
            res = ath6kl_commit_ch_switch(vif, channel);

        if (res)
            ath6kl_err("channel switch failed nw_type %d res %d\n",
                   vif->nw_type, res);
    }
    spin_unlock_bh(&ar->list_lock);
}

void ath6kl_connect_event(struct ath6kl_vif *vif, u16 channel, u8 *bssid,
              u16 listen_int, u16 beacon_int,
              enum network_type net_type, u8 beacon_ie_len,
              u8 assoc_req_len, u8 assoc_resp_len,
              u8 *assoc_info)
{
    struct ath6kl *ar = vif->ar;

    ath6kl_cfg80211_connect_event(vif, channel, bssid,
                      listen_int, beacon_int,
                      net_type, beacon_ie_len,
                      assoc_req_len, assoc_resp_len,
                      assoc_info);

    memcpy(vif->bssid, bssid, sizeof(vif->bssid));
    vif->bss_ch = channel;

    if ((vif->nw_type == INFRA_NETWORK)) {
        ath6kl_wmi_listeninterval_cmd(ar->wmi, vif->fw_vif_idx,
                          vif->listen_intvl_t, 0);
        ath6kl_check_ch_switch(ar, channel);
    }

    netif_wake_queue(vif->ndev);

    /* Update connect & link status atomically */
    spin_lock_bh(&vif->if_lock);
    set_bit(CONNECTED, &vif->flags);
    clear_bit(CONNECT_PEND, &vif->flags);
    netif_carrier_on(vif->ndev);
    spin_unlock_bh(&vif->if_lock);

    aggr_reset_state(vif->aggr_cntxt->aggr_conn);
    vif->reconnect_flag = 0;

    if ((vif->nw_type == ADHOC_NETWORK) && ar->ibss_ps_enable) {
        memset(ar->node_map, 0, sizeof(ar->node_map));
        ar->node_num = 0;
        ar->next_ep_id = ENDPOINT_2;
    }

    if (!ar->usr_bss_filter) {
        set_bit(CLEAR_BSSFILTER_ON_BEACON, &vif->flags);
        ath6kl_wmi_bssfilter_cmd(ar->wmi, vif->fw_vif_idx,
                     CURRENT_BSS_FILTER, 0);
    }
}

void ath6kl_tkip_micerr_event(struct ath6kl_vif *vif, u8 keyid, bool ismcast)
{
    struct ath6kl_sta *sta;
    struct ath6kl *ar = vif->ar;
    u8 tsc[6];

    /*
     * For AP case, keyid will have aid of STA which sent pkt with
     * MIC error. Use this aid to get MAC & send it to hostapd.
     */
    if (vif->nw_type == AP_NETWORK) {
        sta = ath6kl_find_sta_by_aid(ar, (keyid >> 2));
        if (!sta)
            return;

        ath6kl_dbg(ATH6KL_DBG_TRC,
               "ap tkip mic error received from aid=%d\n", keyid);

        memset(tsc, 0, sizeof(tsc)); /* FIX: get correct TSC */
        cfg80211_michael_mic_failure(vif->ndev, sta->mac,
                         NL80211_KEYTYPE_PAIRWISE, keyid,
                         tsc, GFP_KERNEL);
    } else
        ath6kl_cfg80211_tkip_micerr_event(vif, keyid, ismcast);

}

static void ath6kl_update_target_stats(struct ath6kl_vif *vif, u8 *ptr, u32 len)
{
    struct wmi_target_stats *tgt_stats =
        (struct wmi_target_stats *) ptr;
    struct ath6kl *ar = vif->ar;
    struct target_stats *stats = &vif->target_stats;
    struct tkip_ccmp_stats *ccmp_stats;
    u8 ac;

    if (len < sizeof(*tgt_stats))
        return;

    ath6kl_dbg(ATH6KL_DBG_TRC, "updating target stats\n");

    stats->tx_pkt += le32_to_cpu(tgt_stats->stats.tx.pkt);
    stats->tx_byte += le32_to_cpu(tgt_stats->stats.tx.byte);
    stats->tx_ucast_pkt += le32_to_cpu(tgt_stats->stats.tx.ucast_pkt);
    stats->tx_ucast_byte += le32_to_cpu(tgt_stats->stats.tx.ucast_byte);
    stats->tx_mcast_pkt += le32_to_cpu(tgt_stats->stats.tx.mcast_pkt);
    stats->tx_mcast_byte += le32_to_cpu(tgt_stats->stats.tx.mcast_byte);
    stats->tx_bcast_pkt  += le32_to_cpu(tgt_stats->stats.tx.bcast_pkt);
    stats->tx_bcast_byte += le32_to_cpu(tgt_stats->stats.tx.bcast_byte);
    stats->tx_rts_success_cnt +=
        le32_to_cpu(tgt_stats->stats.tx.rts_success_cnt);

    for (ac = 0; ac < WMM_NUM_AC; ac++)
        stats->tx_pkt_per_ac[ac] +=
            le32_to_cpu(tgt_stats->stats.tx.pkt_per_ac[ac]);

    stats->tx_err += le32_to_cpu(tgt_stats->stats.tx.err);
    stats->tx_fail_cnt += le32_to_cpu(tgt_stats->stats.tx.fail_cnt);
    stats->tx_retry_cnt += le32_to_cpu(tgt_stats->stats.tx.retry_cnt);
    stats->tx_mult_retry_cnt +=
        le32_to_cpu(tgt_stats->stats.tx.mult_retry_cnt);
    stats->tx_rts_fail_cnt +=
        le32_to_cpu(tgt_stats->stats.tx.rts_fail_cnt);
    stats->tx_ucast_rate =
        ath6kl_wmi_get_rate(a_sle32_to_cpu(tgt_stats->stats.tx.ucast_rate));

    stats->rx_pkt += le32_to_cpu(tgt_stats->stats.rx.pkt);
    stats->rx_byte += le32_to_cpu(tgt_stats->stats.rx.byte);
    stats->rx_ucast_pkt += le32_to_cpu(tgt_stats->stats.rx.ucast_pkt);
    stats->rx_ucast_byte += le32_to_cpu(tgt_stats->stats.rx.ucast_byte);
    stats->rx_mcast_pkt += le32_to_cpu(tgt_stats->stats.rx.mcast_pkt);
    stats->rx_mcast_byte += le32_to_cpu(tgt_stats->stats.rx.mcast_byte);
    stats->rx_bcast_pkt += le32_to_cpu(tgt_stats->stats.rx.bcast_pkt);
    stats->rx_bcast_byte += le32_to_cpu(tgt_stats->stats.rx.bcast_byte);
    stats->rx_frgment_pkt += le32_to_cpu(tgt_stats->stats.rx.frgment_pkt);
    stats->rx_err += le32_to_cpu(tgt_stats->stats.rx.err);
    stats->rx_crc_err += le32_to_cpu(tgt_stats->stats.rx.crc_err);
    stats->rx_key_cache_miss +=
        le32_to_cpu(tgt_stats->stats.rx.key_cache_miss);
    stats->rx_decrypt_err += le32_to_cpu(tgt_stats->stats.rx.decrypt_err);
    stats->rx_dupl_frame += le32_to_cpu(tgt_stats->stats.rx.dupl_frame);
    stats->rx_ucast_rate =
        ath6kl_wmi_get_rate(a_sle32_to_cpu(tgt_stats->stats.rx.ucast_rate));

    ccmp_stats = &tgt_stats->stats.tkip_ccmp_stats;

    stats->tkip_local_mic_fail +=
        le32_to_cpu(ccmp_stats->tkip_local_mic_fail);
    stats->tkip_cnter_measures_invoked +=
        le32_to_cpu(ccmp_stats->tkip_cnter_measures_invoked);
    stats->tkip_fmt_err += le32_to_cpu(ccmp_stats->tkip_fmt_err);

    stats->ccmp_fmt_err += le32_to_cpu(ccmp_stats->ccmp_fmt_err);
    stats->ccmp_replays += le32_to_cpu(ccmp_stats->ccmp_replays);

    stats->pwr_save_fail_cnt +=
        le32_to_cpu(tgt_stats->pm_stats.pwr_save_failure_cnt);
    stats->noise_floor_calib =
        a_sle32_to_cpu(tgt_stats->noise_floor_calib);

    stats->cs_bmiss_cnt +=
        le32_to_cpu(tgt_stats->cserv_stats.cs_bmiss_cnt);
    stats->cs_low_rssi_cnt +=
        le32_to_cpu(tgt_stats->cserv_stats.cs_low_rssi_cnt);
    stats->cs_connect_cnt +=
        le16_to_cpu(tgt_stats->cserv_stats.cs_connect_cnt);
    stats->cs_discon_cnt +=
        le16_to_cpu(tgt_stats->cserv_stats.cs_discon_cnt);

    stats->cs_ave_beacon_rssi =
        a_sle16_to_cpu(tgt_stats->cserv_stats.cs_ave_beacon_rssi);

    stats->cs_last_roam_msec =
        tgt_stats->cserv_stats.cs_last_roam_msec;
    stats->cs_snr = tgt_stats->cserv_stats.cs_snr;
    stats->cs_rssi = a_sle16_to_cpu(tgt_stats->cserv_stats.cs_rssi);

    stats->lq_val = le32_to_cpu(tgt_stats->lq_val);

    stats->wow_pkt_dropped +=
        le32_to_cpu(tgt_stats->wow_stats.wow_pkt_dropped);
    stats->wow_host_pkt_wakeups +=
        tgt_stats->wow_stats.wow_host_pkt_wakeups;
    stats->wow_host_evt_wakeups +=
        tgt_stats->wow_stats.wow_host_evt_wakeups;
    stats->wow_evt_discarded +=
        le16_to_cpu(tgt_stats->wow_stats.wow_evt_discarded);

    stats->arp_received = le32_to_cpu(tgt_stats->arp_stats.arp_received);
    stats->arp_replied = le32_to_cpu(tgt_stats->arp_stats.arp_replied);
    stats->arp_matched = le32_to_cpu(tgt_stats->arp_stats.arp_matched);

    if (test_bit(STATS_UPDATE_PEND, &vif->flags)) {
        clear_bit(STATS_UPDATE_PEND, &vif->flags);
        wake_up(&ar->event_wq);
    }
}

static void ath6kl_add_le32(__le32 *var, __le32 val)
{
    *var = cpu_to_le32(le32_to_cpu(*var) + le32_to_cpu(val));
}

void ath6kl_tgt_stats_event(struct ath6kl_vif *vif, u8 *ptr, u32 len)
{
    struct wmi_ap_mode_stat *p = (struct wmi_ap_mode_stat *) ptr;
    struct ath6kl *ar = vif->ar;
    struct wmi_ap_mode_stat *ap = &ar->ap_stats;
    struct wmi_per_sta_stat *st_ap, *st_p;
    u8 ac;

    if (vif->nw_type == AP_NETWORK) {
        if (len < sizeof(*p))
            return;

        for (ac = 0; ac < AP_MAX_NUM_STA; ac++) {
            st_ap = &ap->sta[ac];
            st_p = &p->sta[ac];

            ath6kl_add_le32(&st_ap->tx_bytes, st_p->tx_bytes);
            ath6kl_add_le32(&st_ap->tx_pkts, st_p->tx_pkts);
            ath6kl_add_le32(&st_ap->tx_error, st_p->tx_error);
            ath6kl_add_le32(&st_ap->tx_discard, st_p->tx_discard);
            ath6kl_add_le32(&st_ap->rx_bytes, st_p->rx_bytes);
            ath6kl_add_le32(&st_ap->rx_pkts, st_p->rx_pkts);
            ath6kl_add_le32(&st_ap->rx_error, st_p->rx_error);
            ath6kl_add_le32(&st_ap->rx_discard, st_p->rx_discard);
        }

    } else {
        ath6kl_update_target_stats(vif, ptr, len);
    }
}

void ath6kl_wakeup_event(void *dev)
{
    struct ath6kl *ar = (struct ath6kl *) dev;

    wake_up(&ar->event_wq);
}

void ath6kl_txpwr_rx_evt(void *devt, u8 tx_pwr)
{
    struct ath6kl *ar = (struct ath6kl *) devt;

    ar->tx_pwr = tx_pwr;
    wake_up(&ar->event_wq);
}

void ath6kl_pspoll_event(struct ath6kl_vif *vif, u8 aid)
{
    struct ath6kl_sta *conn;
    struct sk_buff *skb;
    bool psq_empty = false;
    struct ath6kl *ar = vif->ar;
    struct ath6kl_mgmt_buff *mgmt_buf;

    conn = ath6kl_find_sta_by_aid(ar, aid);

    if (!conn)
        return;
    /*
     * Send out a packet queued on ps queue. When the ps queue
     * becomes empty update the PVB for this station.
     */
    spin_lock_bh(&conn->psq_lock);
    psq_empty  = skb_queue_empty(&conn->psq) && (conn->mgmt_psq_len == 0);
    spin_unlock_bh(&conn->psq_lock);

    if (psq_empty)
        /* TODO: Send out a NULL data frame */
        return;

    spin_lock_bh(&conn->psq_lock);
    if (conn->mgmt_psq_len > 0) {
        mgmt_buf = list_first_entry(&conn->mgmt_psq,
                    struct ath6kl_mgmt_buff, list);
        list_del(&mgmt_buf->list);
        conn->mgmt_psq_len--;
        spin_unlock_bh(&conn->psq_lock);

        conn->sta_flags |= STA_PS_POLLED;
        ath6kl_wmi_send_mgmt_cmd(ar->wmi, vif->fw_vif_idx,
                     mgmt_buf->id, mgmt_buf->freq,
                     mgmt_buf->wait, mgmt_buf->buf,
                     mgmt_buf->len, mgmt_buf->no_cck);
        conn->sta_flags &= ~STA_PS_POLLED;
        kfree(mgmt_buf);
    } else {
        skb = skb_dequeue(&conn->psq);
        spin_unlock_bh(&conn->psq_lock);

        conn->sta_flags |= STA_PS_POLLED;
        ath6kl_data_tx(skb, vif->ndev);
        conn->sta_flags &= ~STA_PS_POLLED;
    }

    spin_lock_bh(&conn->psq_lock);
    psq_empty  = skb_queue_empty(&conn->psq) && (conn->mgmt_psq_len == 0);
    spin_unlock_bh(&conn->psq_lock);

    if (psq_empty)
        ath6kl_wmi_set_pvb_cmd(ar->wmi, vif->fw_vif_idx, conn->aid, 0);
}

void ath6kl_dtimexpiry_event(struct ath6kl_vif *vif)
{
    bool mcastq_empty = false;
    struct sk_buff *skb;
    struct ath6kl *ar = vif->ar;

    /*
     * If there are no associated STAs, ignore the DTIM expiry event.
     * There can be potential race conditions where the last associated
     * STA may disconnect & before the host could clear the 'Indicate
     * DTIM' request to the firmware, the firmware would have just
     * indicated a DTIM expiry event. The race is between 'clear DTIM
     * expiry cmd' going from the host to the firmware & the DTIM
     * expiry event happening from the firmware to the host.
     */
    if (!ar->sta_list_index)
        return;

    spin_lock_bh(&ar->mcastpsq_lock);
    mcastq_empty = skb_queue_empty(&ar->mcastpsq);
    spin_unlock_bh(&ar->mcastpsq_lock);

    if (mcastq_empty)
        return;

    /* set the STA flag to dtim_expired for the frame to go out */
    set_bit(DTIM_EXPIRED, &vif->flags);

    spin_lock_bh(&ar->mcastpsq_lock);
    while ((skb = skb_dequeue(&ar->mcastpsq)) != NULL) {
        spin_unlock_bh(&ar->mcastpsq_lock);

        ath6kl_data_tx(skb, vif->ndev);

        spin_lock_bh(&ar->mcastpsq_lock);
    }
    spin_unlock_bh(&ar->mcastpsq_lock);

    clear_bit(DTIM_EXPIRED, &vif->flags);

    /* clear the LSB of the BitMapCtl field of the TIM IE */
    ath6kl_wmi_set_pvb_cmd(ar->wmi, vif->fw_vif_idx, MCAST_AID, 0);
}

void ath6kl_disconnect_event(struct ath6kl_vif *vif, u8 reason, u8 *bssid,
                 u8 assoc_resp_len, u8 *assoc_info,
                 u16 prot_reason_status)
{
    struct ath6kl *ar = vif->ar;

    if (vif->nw_type == AP_NETWORK) {
        /* disconnect due to other STA vif switching channels */
        if (reason == BSS_DISCONNECTED &&
            prot_reason_status == WMI_AP_REASON_STA_ROAM)
            ar->want_ch_switch |= 1 << vif->fw_vif_idx;

        if (!ath6kl_remove_sta(ar, bssid, prot_reason_status))
            return;

        /* if no more associated STAs, empty the mcast PS q */
        if (ar->sta_list_index == 0) {
            spin_lock_bh(&ar->mcastpsq_lock);
            skb_queue_purge(&ar->mcastpsq);
            spin_unlock_bh(&ar->mcastpsq_lock);

            /* clear the LSB of the TIM IE's BitMapCtl field */
            if (test_bit(WMI_READY, &ar->flag))
                ath6kl_wmi_set_pvb_cmd(ar->wmi, vif->fw_vif_idx,
                               MCAST_AID, 0);
        }

        if (!is_broadcast_ether_addr(bssid)) {
            /* send event to application */
            cfg80211_del_sta(vif->ndev, bssid, GFP_KERNEL);
        }

        if (memcmp(vif->ndev->dev_addr, bssid, ETH_ALEN) == 0) {
            memset(vif->wep_key_list, 0, sizeof(vif->wep_key_list));
            clear_bit(CONNECTED, &vif->flags);
        }
        return;
    }

    ath6kl_cfg80211_disconnect_event(vif, reason, bssid,
                     assoc_resp_len, assoc_info,
                     prot_reason_status);

    aggr_reset_state(vif->aggr_cntxt->aggr_conn);

    del_timer(&vif->disconnect_timer);

    ath6kl_dbg(ATH6KL_DBG_WLAN_CFG, "disconnect reason is %d\n", reason);

    /*
     * If the event is due to disconnect cmd from the host, only they
     * the target would stop trying to connect. Under any other
     * condition, target would keep trying to connect.
     */
    if (reason == DISCONNECT_CMD) {
        if (!ar->usr_bss_filter && test_bit(WMI_READY, &ar->flag))
            ath6kl_wmi_bssfilter_cmd(ar->wmi, vif->fw_vif_idx,
                         NONE_BSS_FILTER, 0);
    } else {
        set_bit(CONNECT_PEND, &vif->flags);
        if (((reason == ASSOC_FAILED) &&
             (prot_reason_status == 0x11)) ||
            ((reason == ASSOC_FAILED) && (prot_reason_status == 0x0) &&
             (vif->reconnect_flag == 1))) {
            set_bit(CONNECTED, &vif->flags);
            return;
        }
    }

    /* update connect & link status atomically */
    spin_lock_bh(&vif->if_lock);
    clear_bit(CONNECTED, &vif->flags);
    netif_carrier_off(vif->ndev);
    spin_unlock_bh(&vif->if_lock);

    if ((reason != CSERV_DISCONNECT) || (vif->reconnect_flag != 1))
        vif->reconnect_flag = 0;

    if (reason != CSERV_DISCONNECT)
        ar->user_key_ctrl = 0;

    netif_stop_queue(vif->ndev);
    memset(vif->bssid, 0, sizeof(vif->bssid));
    vif->bss_ch = 0;

    ath6kl_tx_data_cleanup(ar);
}

struct ath6kl_vif *ath6kl_vif_first(struct ath6kl *ar)
{
    struct ath6kl_vif *vif;

    spin_lock_bh(&ar->list_lock);
    if (list_empty(&ar->vif_list)) {
        spin_unlock_bh(&ar->list_lock);
        return NULL;
    }

    vif = list_first_entry(&ar->vif_list, struct ath6kl_vif, list);

    spin_unlock_bh(&ar->list_lock);

    return vif;
}

static int ath6kl_open(struct net_device *dev)
{
    struct ath6kl_vif *vif = netdev_priv(dev);

    set_bit(WLAN_ENABLED, &vif->flags);

    if (test_bit(CONNECTED, &vif->flags)) {
        netif_carrier_on(dev);
        netif_wake_queue(dev);
    } else
        netif_carrier_off(dev);

    return 0;
}

static int ath6kl_close(struct net_device *dev)
{
    struct ath6kl_vif *vif = netdev_priv(dev);

    netif_stop_queue(dev);

    ath6kl_cfg80211_stop(vif);

    clear_bit(WLAN_ENABLED, &vif->flags);

    return 0;
}

static struct net_device_stats *ath6kl_get_stats(struct net_device *dev)
{
    struct ath6kl_vif *vif = netdev_priv(dev);

    return &vif->net_stats;
}

static int ath6kl_set_features(struct net_device *dev,
                   netdev_features_t features)
{
    struct ath6kl_vif *vif = netdev_priv(dev);
    struct ath6kl *ar = vif->ar;
    int err = 0;

    if ((features & NETIF_F_RXCSUM) &&
        (ar->rx_meta_ver != WMI_META_VERSION_2)) {
        ar->rx_meta_ver = WMI_META_VERSION_2;
        err = ath6kl_wmi_set_rx_frame_format_cmd(ar->wmi,
                             vif->fw_vif_idx,
                             ar->rx_meta_ver, 0, 0);
        if (err) {
            dev->features = features & ~NETIF_F_RXCSUM;
            return err;
        }
    } else if (!(features & NETIF_F_RXCSUM) &&
           (ar->rx_meta_ver == WMI_META_VERSION_2)) {
        ar->rx_meta_ver = 0;
        err = ath6kl_wmi_set_rx_frame_format_cmd(ar->wmi,
                             vif->fw_vif_idx,
                             ar->rx_meta_ver, 0, 0);
        if (err) {
            dev->features = features | NETIF_F_RXCSUM;
            return err;
        }

    }

    return err;
}

static void ath6kl_set_multicast_list(struct net_device *ndev)
{
    struct ath6kl_vif *vif = netdev_priv(ndev);
    bool mc_all_on = false;
    int mc_count = netdev_mc_count(ndev);
    struct netdev_hw_addr *ha;
    bool found;
    struct ath6kl_mc_filter *mc_filter, *tmp;
    struct list_head mc_filter_new;
    int ret;

    if (!test_bit(WMI_READY, &vif->ar->flag) ||
        !test_bit(WLAN_ENABLED, &vif->flags))
        return;

    /* Enable multicast-all filter. */
    mc_all_on = !!(ndev->flags & IFF_PROMISC) ||
            !!(ndev->flags & IFF_ALLMULTI) ||
            !!(mc_count > ATH6K_MAX_MC_FILTERS_PER_LIST);

    if (mc_all_on)
        set_bit(NETDEV_MCAST_ALL_ON, &vif->flags);
    else
        clear_bit(NETDEV_MCAST_ALL_ON, &vif->flags);

    if (test_bit(ATH6KL_FW_CAPABILITY_WOW_MULTICAST_FILTER,
             vif->ar->fw_capabilities)) {
        mc_all_on = mc_all_on || (vif->ar->state == ATH6KL_STATE_ON);
    }

    if (!(ndev->flags & IFF_MULTICAST)) {
        mc_all_on = false;
        set_bit(NETDEV_MCAST_ALL_OFF, &vif->flags);
    } else {
        clear_bit(NETDEV_MCAST_ALL_OFF, &vif->flags);
    }

    /* Enable/disable "multicast-all" filter*/
    ath6kl_dbg(ATH6KL_DBG_TRC, "%s multicast-all filter\n",
           mc_all_on ? "enabling" : "disabling");

    ret = ath6kl_wmi_mcast_filter_cmd(vif->ar->wmi, vif->fw_vif_idx,
                          mc_all_on);
    if (ret) {
        ath6kl_warn("Failed to %s multicast-all receive\n",
                mc_all_on ? "enable" : "disable");
        return;
    }

    if (test_bit(NETDEV_MCAST_ALL_ON, &vif->flags))
        return;

    /* Keep the driver and firmware mcast list in sync. */
    list_for_each_entry_safe(mc_filter, tmp, &vif->mc_filter, list) {
        found = false;
        netdev_for_each_mc_addr(ha, ndev) {
            if (memcmp(ha->addr, mc_filter->hw_addr,
                   ATH6KL_MCAST_FILTER_MAC_ADDR_SIZE) == 0) {
                found = true;
                break;
            }
        }

        if (!found) {
            /*
             * Delete the filter which was previously set
             * but not in the new request.
             */
            ath6kl_dbg(ATH6KL_DBG_TRC,
                   "Removing %pM from multicast filter\n",
                   mc_filter->hw_addr);
            ret = ath6kl_wmi_add_del_mcast_filter_cmd(vif->ar->wmi,
                    vif->fw_vif_idx, mc_filter->hw_addr,
                    false);
            if (ret) {
                ath6kl_warn("Failed to remove multicast filter:%pM\n",
                        mc_filter->hw_addr);
                return;
            }

            list_del(&mc_filter->list);
            kfree(mc_filter);
        }
    }

    INIT_LIST_HEAD(&mc_filter_new);

    netdev_for_each_mc_addr(ha, ndev) {
        found = false;
        list_for_each_entry(mc_filter, &vif->mc_filter, list) {
            if (memcmp(ha->addr, mc_filter->hw_addr,
                   ATH6KL_MCAST_FILTER_MAC_ADDR_SIZE) == 0) {
                found = true;
                break;
            }
        }

        if (!found) {
            mc_filter = kzalloc(sizeof(struct ath6kl_mc_filter),
                        GFP_ATOMIC);
            if (!mc_filter) {
                WARN_ON(1);
                goto out;
            }

            memcpy(mc_filter->hw_addr, ha->addr,
                   ATH6KL_MCAST_FILTER_MAC_ADDR_SIZE);
            /* Set the multicast filter */
            ath6kl_dbg(ATH6KL_DBG_TRC,
                   "Adding %pM to multicast filter list\n",
                   mc_filter->hw_addr);
            ret = ath6kl_wmi_add_del_mcast_filter_cmd(vif->ar->wmi,
                    vif->fw_vif_idx, mc_filter->hw_addr,
                    true);
            if (ret) {
                ath6kl_warn("Failed to add multicast filter :%pM\n",
                        mc_filter->hw_addr);
                kfree(mc_filter);
                goto out;
            }

            list_add_tail(&mc_filter->list, &mc_filter_new);
        }
    }

out:
    list_splice_tail(&mc_filter_new, &vif->mc_filter);
}

static const struct net_device_ops ath6kl_netdev_ops = {
    .ndo_open               = ath6kl_open,
    .ndo_stop               = ath6kl_close,
    .ndo_start_xmit         = ath6kl_data_tx,
    .ndo_get_stats          = ath6kl_get_stats,
    .ndo_set_features       = ath6kl_set_features,
    .ndo_set_rx_mode    = ath6kl_set_multicast_list,
};

void init_netdev(struct net_device *dev)
{
    dev->netdev_ops = &ath6kl_netdev_ops;
    dev->destructor = free_netdev;
    dev->watchdog_timeo = ATH6KL_TX_TIMEOUT;

    dev->needed_headroom = ETH_HLEN;
    dev->needed_headroom += sizeof(struct ath6kl_llc_snap_hdr) +
                sizeof(struct wmi_data_hdr) + HTC_HDR_LENGTH
                + WMI_MAX_TX_META_SZ + ATH6KL_HTC_ALIGN_BYTES;

    dev->hw_features |= NETIF_F_IP_CSUM | NETIF_F_RXCSUM;

    return;
}