/*
 * 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;

        if (is_zero_ether_addr(node_addr))
                return NULL;

        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));
        eth_zero_addr(sta->mac);
        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%x\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);
        ret = ath6kl_diag_read(ar, address, &debug_hdr, sizeof(debug_hdr));
        if (ret)
                goto out;

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

        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));
                ret = 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;
}

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->last_ch != channel)
                /* 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;

        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:
                /*
                 * reconfigure any saved RSN IE capabilites in the beacon /
                 * probe response to stay in sync with the supplicant.
                 */
                if (vif->rsn_capab &&
                    test_bit(ATH6KL_FW_CAPABILITY_RSN_CAP_OVERRIDE,
                             ar->fw_capabilities))
                        ath6kl_wmi_set_ie_cmd(ar->wmi, vif->fw_vif_idx,
                                              WLAN_EID_RSN, WMI_RSN_IE_CAPB,
                                              (const u8 *) &vif->rsn_capab,
                                              sizeof(vif->rsn_capab));

                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 channel switch failed, oh well we tried */
                ar->want_ch_switch &= ~(1 << vif->fw_vif_idx);

                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;
        s32 rate;
        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);

        rate = a_sle32_to_cpu(tgt_stats->stats.tx.ucast_rate);
        stats->tx_ucast_rate = ath6kl_wmi_get_rate(ar->wmi, 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);

        rate = a_sle32_to_cpu(tgt_stats->stats.rx.ucast_rate);
        stats->rx_ucast_rate = ath6kl_wmi_get_rate(ar->wmi, 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;
                        /* bail back to this channel if STA vif fails connect */
                        ar->last_ch = le16_to_cpu(vif->profile.ch);
                }

                if (prot_reason_status == WMI_AP_REASON_MAX_STA) {
                        /* send max client reached notification to user space */
                        cfg80211_conn_failed(vif->ndev, bssid,
                                             NL80211_CONN_FAIL_MAX_CLIENTS,
                                             GFP_KERNEL);
                }

                if (prot_reason_status == WMI_AP_REASON_ACL) {
                        /* send blocked client notification to user space */
                        cfg80211_conn_failed(vif->ndev, bssid,
                                             NL80211_CONN_FAIL_BLOCKED_CLIENT,
                                             GFP_KERNEL);
                }

                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;
                }
        }

        /* restart disconnected concurrent vifs waiting for new channel */
        ath6kl_check_ch_switch(ar, ar->last_ch);

        /* 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 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_set_features       = ath6kl_set_features,
        .ndo_set_rx_mode        = ath6kl_set_multicast_list,
};

void init_netdev(struct net_device *dev)
{
        struct ath6kl *ar = ath6kl_priv(dev);

        dev->netdev_ops = &ath6kl_netdev_ops;
        dev->needs_free_netdev = true;
        dev->watchdog_timeo = ATH6KL_TX_TIMEOUT;

        dev->needed_headroom = ETH_HLEN;
        dev->needed_headroom += roundup(sizeof(struct ath6kl_llc_snap_hdr) +
                                        sizeof(struct wmi_data_hdr) +
                                        HTC_HDR_LENGTH +
                                        WMI_MAX_TX_META_SZ +
                                        ATH6KL_HTC_ALIGN_BYTES, 4);

        if (!test_bit(ATH6KL_FW_CAPABILITY_NO_IP_CHECKSUM,
                      ar->fw_capabilities))
                dev->hw_features |= NETIF_F_IP_CSUM | NETIF_F_RXCSUM;

        return;
}