/******************************************************************************
 *
 * Copyright(c) 2007 - 2012 Realtek Corporation. All rights reserved.
 *
 * 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.
 *
 ******************************************************************************/
#define _RTW_RECV_C_

#include <linux/ieee80211.h>

#include <osdep_service.h>
#include <drv_types.h>
#include <recv_osdep.h>
#include <mlme_osdep.h>
#include <mon.h>
#include <wifi.h>
#include <linux/vmalloc.h>

#define ETHERNET_HEADER_SIZE    14      /*  Ethernet Header Length */
#define LLC_HEADER_SIZE                 6       /*  LLC Header Length */

static u8 SNAP_ETH_TYPE_IPX[2] = {0x81, 0x37};
static u8 SNAP_ETH_TYPE_APPLETALK_AARP[2] = {0x80, 0xf3};

/* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
static u8 rtw_bridge_tunnel_header[] = {
       0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8
};

static u8 rtw_rfc1042_header[] = {
       0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00
};

static void rtw_signal_stat_timer_hdl(unsigned long data);

void _rtw_init_sta_recv_priv(struct sta_recv_priv *psta_recvpriv)
{

        memset((u8 *)psta_recvpriv, 0, sizeof(struct sta_recv_priv));

        spin_lock_init(&psta_recvpriv->lock);

        _rtw_init_queue(&psta_recvpriv->defrag_q);

}

int _rtw_init_recv_priv(struct recv_priv *precvpriv, struct adapter *padapter)
{
        int i;

        struct recv_frame *precvframe;

        int     res = _SUCCESS;

        _rtw_init_queue(&precvpriv->free_recv_queue);
        _rtw_init_queue(&precvpriv->recv_pending_queue);
        _rtw_init_queue(&precvpriv->uc_swdec_pending_queue);

        precvpriv->adapter = padapter;

        precvpriv->free_recvframe_cnt = NR_RECVFRAME;

        precvpriv->pallocated_frame_buf = vzalloc(NR_RECVFRAME * sizeof(struct recv_frame) + RXFRAME_ALIGN_SZ);

        if (!precvpriv->pallocated_frame_buf)
                return _FAIL;

        precvpriv->precv_frame_buf = PTR_ALIGN(precvpriv->pallocated_frame_buf, RXFRAME_ALIGN_SZ);

        precvframe = (struct recv_frame *)precvpriv->precv_frame_buf;

        for (i = 0; i < NR_RECVFRAME; i++) {
                INIT_LIST_HEAD(&(precvframe->list));

                list_add_tail(&(precvframe->list),
                                     &(precvpriv->free_recv_queue.queue));

                rtw_os_recv_resource_alloc(precvframe);

                precvframe->len = 0;

                precvframe->adapter = padapter;
                precvframe++;
        }
        precvpriv->rx_pending_cnt = 1;

        res = rtw_hal_init_recv_priv(padapter);

        setup_timer(&precvpriv->signal_stat_timer,
                    rtw_signal_stat_timer_hdl,
                    (unsigned long)padapter);

        precvpriv->signal_stat_sampling_interval = 1000; /* ms */

        rtw_set_signal_stat_timer(precvpriv);

        return res;
}

void _rtw_free_recv_priv(struct recv_priv *precvpriv)
{
        struct adapter  *padapter = precvpriv->adapter;

        rtw_free_uc_swdec_pending_queue(padapter);

        vfree(precvpriv->pallocated_frame_buf);

        rtw_hal_free_recv_priv(padapter);

}

struct recv_frame *_rtw_alloc_recvframe(struct __queue *pfree_recv_queue)
{
        struct recv_frame *hdr;
        struct adapter *padapter;
        struct recv_priv *precvpriv;

        hdr = list_first_entry_or_null(&pfree_recv_queue->queue,
                                       struct recv_frame, list);
        if (hdr) {
                list_del_init(&hdr->list);
                padapter = hdr->adapter;
                if (padapter) {
                        precvpriv = &padapter->recvpriv;
                        if (pfree_recv_queue == &precvpriv->free_recv_queue)
                                precvpriv->free_recvframe_cnt--;
                }
        }

        return hdr;
}

struct recv_frame *rtw_alloc_recvframe(struct __queue *pfree_recv_queue)
{
        struct recv_frame  *precvframe;

        spin_lock_bh(&pfree_recv_queue->lock);

        precvframe = _rtw_alloc_recvframe(pfree_recv_queue);

        spin_unlock_bh(&pfree_recv_queue->lock);

        return precvframe;
}

int rtw_free_recvframe(struct recv_frame *precvframe,
                       struct __queue *pfree_recv_queue)
{
        struct adapter *padapter;
        struct recv_priv *precvpriv;

        if (!precvframe)
                return _FAIL;
        padapter = precvframe->adapter;
        precvpriv = &padapter->recvpriv;
        if (precvframe->pkt) {
                dev_kfree_skb_any(precvframe->pkt);/* free skb by driver */
                precvframe->pkt = NULL;
        }

        spin_lock_bh(&pfree_recv_queue->lock);

        list_del_init(&(precvframe->list));

        precvframe->len = 0;

        list_add_tail(&(precvframe->list), get_list_head(pfree_recv_queue));

        if (padapter != NULL) {
                if (pfree_recv_queue == &precvpriv->free_recv_queue)
                                precvpriv->free_recvframe_cnt++;
        }

      spin_unlock_bh(&pfree_recv_queue->lock);

        return _SUCCESS;
}

int _rtw_enqueue_recvframe(struct recv_frame *precvframe, struct __queue *queue)
{
        struct adapter *padapter = precvframe->adapter;
        struct recv_priv *precvpriv = &padapter->recvpriv;

        list_del_init(&(precvframe->list));
        list_add_tail(&(precvframe->list), get_list_head(queue));

        if (padapter != NULL) {
                if (queue == &precvpriv->free_recv_queue)
                        precvpriv->free_recvframe_cnt++;
        }

        return _SUCCESS;
}

int rtw_enqueue_recvframe(struct recv_frame *precvframe, struct __queue *queue)
{
        int ret;

        spin_lock_bh(&queue->lock);
        ret = _rtw_enqueue_recvframe(precvframe, queue);
        spin_unlock_bh(&queue->lock);

        return ret;
}

/*
caller : defrag ; recvframe_chk_defrag in recv_thread  (passive)
pframequeue: defrag_queue : will be accessed in recv_thread  (passive)

using spinlock to protect

*/

void rtw_free_recvframe_queue(struct __queue *pframequeue,  struct __queue *pfree_recv_queue)
{
        struct recv_frame *hdr;
        struct list_head *plist, *phead;

        spin_lock(&pframequeue->lock);

        phead = get_list_head(pframequeue);
        plist = phead->next;

        while (phead != plist) {
                hdr = container_of(plist, struct recv_frame, list);

                plist = plist->next;

                rtw_free_recvframe(hdr, pfree_recv_queue);
        }

        spin_unlock(&pframequeue->lock);

}

u32 rtw_free_uc_swdec_pending_queue(struct adapter *adapter)
{
        u32 cnt = 0;
        struct recv_frame *pending_frame;
        while ((pending_frame = rtw_alloc_recvframe(&adapter->recvpriv.uc_swdec_pending_queue))) {
                rtw_free_recvframe(pending_frame, &adapter->recvpriv.free_recv_queue);
                DBG_88E("%s: dequeue uc_swdec_pending_queue\n", __func__);
                cnt++;
        }

        return cnt;
}

static int recvframe_chkmic(struct adapter *adapter,
                            struct recv_frame *precvframe)
{
        int     i, res = _SUCCESS;
        u32     datalen;
        u8      miccode[8];
        u8      bmic_err = false, brpt_micerror = true;
        u8      *pframe, *payload, *pframemic;
        u8      *mickey;
        struct  sta_info                *stainfo;
        struct  rx_pkt_attrib   *prxattrib = &precvframe->attrib;
        struct  security_priv   *psecuritypriv = &adapter->securitypriv;

        struct mlme_ext_priv    *pmlmeext = &adapter->mlmeextpriv;
        struct mlme_ext_info    *pmlmeinfo = &(pmlmeext->mlmext_info);

        stainfo = rtw_get_stainfo(&adapter->stapriv, &prxattrib->ta[0]);

        if (prxattrib->encrypt == _TKIP_) {
                RT_TRACE(_module_rtl871x_recv_c_, _drv_info_, ("\n recvframe_chkmic:prxattrib->encrypt==_TKIP_\n"));
                RT_TRACE(_module_rtl871x_recv_c_, _drv_info_, ("\n recvframe_chkmic:da=0x%02x:0x%02x:0x%02x:0x%02x:0x%02x:0x%02x\n",
                         prxattrib->ra[0], prxattrib->ra[1], prxattrib->ra[2], prxattrib->ra[3], prxattrib->ra[4], prxattrib->ra[5]));

                /* calculate mic code */
                if (stainfo != NULL) {
                        if (IS_MCAST(prxattrib->ra)) {
                                if (!psecuritypriv) {
                                        res = _FAIL;
                                        RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, ("\n recvframe_chkmic:didn't install group key!!!!!!!!!!\n"));
                                        DBG_88E("\n recvframe_chkmic:didn't install group key!!!!!!!!!!\n");
                                        goto exit;
                                }
                                mickey = &psecuritypriv->dot118021XGrprxmickey[prxattrib->key_index].skey[0];

                                RT_TRACE(_module_rtl871x_recv_c_, _drv_info_, ("\n recvframe_chkmic: bcmc key\n"));
                        } else {
                                mickey = &stainfo->dot11tkiprxmickey.skey[0];
                                RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, ("\n recvframe_chkmic: unicast key\n"));
                        }

                        /* icv_len included the mic code */
                        datalen = precvframe->len-prxattrib->hdrlen -
                                  prxattrib->iv_len-prxattrib->icv_len-8;
                        pframe = precvframe->rx_data;
                        payload = pframe+prxattrib->hdrlen+prxattrib->iv_len;

                        RT_TRACE(_module_rtl871x_recv_c_, _drv_info_, ("\n prxattrib->iv_len=%d prxattrib->icv_len=%d\n", prxattrib->iv_len, prxattrib->icv_len));
                        rtw_seccalctkipmic(mickey, pframe, payload, datalen, &miccode[0],
                                           (unsigned char)prxattrib->priority); /* care the length of the data */

                        pframemic = payload+datalen;

                        bmic_err = false;

                        for (i = 0; i < 8; i++) {
                                if (miccode[i] != *(pframemic+i)) {
                                        RT_TRACE(_module_rtl871x_recv_c_, _drv_err_,
                                                 ("recvframe_chkmic:miccode[%d](%02x)!=*(pframemic+%d)(%02x) ",
                                                 i, miccode[i], i, *(pframemic+i)));
                                        bmic_err = true;
                                }
                        }

                        if (bmic_err) {
                                RT_TRACE(_module_rtl871x_recv_c_, _drv_err_,
                                         ("\n *(pframemic-8)-*(pframemic-1)=0x%02x:0x%02x:0x%02x:0x%02x:0x%02x:0x%02x:0x%02x:0x%02x\n",
                                         *(pframemic-8), *(pframemic-7), *(pframemic-6),
                                         *(pframemic-5), *(pframemic-4), *(pframemic-3),
                                         *(pframemic-2), *(pframemic-1)));
                                RT_TRACE(_module_rtl871x_recv_c_, _drv_err_,
                                         ("\n *(pframemic-16)-*(pframemic-9)=0x%02x:0x%02x:0x%02x:0x%02x:0x%02x:0x%02x:0x%02x:0x%02x\n",
                                         *(pframemic-16), *(pframemic-15), *(pframemic-14),
                                         *(pframemic-13), *(pframemic-12), *(pframemic-11),
                                         *(pframemic-10), *(pframemic-9)));
                                {
                                        uint i;
                                        RT_TRACE(_module_rtl871x_recv_c_, _drv_err_,
                                                 ("\n ======demp packet (len=%d)======\n",
                                                 precvframe->len));
                                        for (i = 0; i < precvframe->len; i += 8) {
                                                RT_TRACE(_module_rtl871x_recv_c_,
                                                         _drv_err_,
                                                         ("0x%02x:0x%02x:0x%02x:0x%02x:0x%02x:0x%02x:0x%02x:0x%02x",
                                                         *(precvframe->rx_data+i),
                                                         *(precvframe->rx_data+i+1),
                                                         *(precvframe->rx_data+i+2),
                                                         *(precvframe->rx_data+i+3),
                                                         *(precvframe->rx_data+i+4),
                                                         *(precvframe->rx_data+i+5),
                                                         *(precvframe->rx_data+i+6),
                                                         *(precvframe->rx_data+i+7)));
                                        }
                                        RT_TRACE(_module_rtl871x_recv_c_,
                                                 _drv_err_,
                                                 ("\n ====== demp packet end [len=%d]======\n",
                                                 precvframe->len));
                                        RT_TRACE(_module_rtl871x_recv_c_,
                                                 _drv_err_,
                                                 ("\n hrdlen=%d,\n",
                                                 prxattrib->hdrlen));
                                }

                                RT_TRACE(_module_rtl871x_recv_c_, _drv_err_,
                                         ("ra=0x%.2x 0x%.2x 0x%.2x 0x%.2x 0x%.2x 0x%.2x psecuritypriv->binstallGrpkey=%d ",
                                         prxattrib->ra[0], prxattrib->ra[1], prxattrib->ra[2],
                                         prxattrib->ra[3], prxattrib->ra[4], prxattrib->ra[5], psecuritypriv->binstallGrpkey));

                                /*  double check key_index for some timing issue , */
                                /*  cannot compare with psecuritypriv->dot118021XGrpKeyid also cause timing issue */
                                if ((IS_MCAST(prxattrib->ra) == true)  && (prxattrib->key_index != pmlmeinfo->key_index))
                                        brpt_micerror = false;

                                if ((prxattrib->bdecrypted) && (brpt_micerror)) {
                                        rtw_handle_tkip_mic_err(adapter, (u8)IS_MCAST(prxattrib->ra));
                                        RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, (" mic error :prxattrib->bdecrypted=%d ", prxattrib->bdecrypted));
                                        DBG_88E(" mic error :prxattrib->bdecrypted=%d\n", prxattrib->bdecrypted);
                                } else {
                                        RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, (" mic error :prxattrib->bdecrypted=%d ", prxattrib->bdecrypted));
                                        DBG_88E(" mic error :prxattrib->bdecrypted=%d\n", prxattrib->bdecrypted);
                                }
                                res = _FAIL;
                        } else {
                                /* mic checked ok */
                                if ((!psecuritypriv->bcheck_grpkey) && (IS_MCAST(prxattrib->ra))) {
                                        psecuritypriv->bcheck_grpkey = true;
                                        RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, ("psecuritypriv->bcheck_grpkey = true"));
                                }
                        }
                } else {
                        RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, ("recvframe_chkmic: rtw_get_stainfo==NULL!!!\n"));
                }

                recvframe_pull_tail(precvframe, 8);
        }

exit:

        return res;
}

/* decrypt and set the ivlen, icvlen of the recv_frame */
static struct recv_frame *decryptor(struct adapter *padapter,
                                    struct recv_frame *precv_frame)
{
        struct rx_pkt_attrib *prxattrib = &precv_frame->attrib;
        struct security_priv *psecuritypriv = &padapter->securitypriv;
        struct recv_frame *return_packet = precv_frame;
        u32      res = _SUCCESS;

        RT_TRACE(_module_rtl871x_recv_c_, _drv_info_, ("prxstat->decrypted=%x prxattrib->encrypt=0x%03x\n", prxattrib->bdecrypted, prxattrib->encrypt));

        if (prxattrib->encrypt > 0) {
                u8 *iv = precv_frame->rx_data+prxattrib->hdrlen;
                prxattrib->key_index = (((iv[3])>>6)&0x3);

                if (prxattrib->key_index > WEP_KEYS) {
                        DBG_88E("prxattrib->key_index(%d)>WEP_KEYS\n", prxattrib->key_index);

                        switch (prxattrib->encrypt) {
                        case _WEP40_:
                        case _WEP104_:
                                prxattrib->key_index = psecuritypriv->dot11PrivacyKeyIndex;
                                break;
                        case _TKIP_:
                        case _AES_:
                        default:
                                prxattrib->key_index = psecuritypriv->dot118021XGrpKeyid;
                                break;
                        }
                }
        }

        if ((prxattrib->encrypt > 0) && ((prxattrib->bdecrypted == 0) || (psecuritypriv->sw_decrypt))) {
                psecuritypriv->hw_decrypted = false;

                switch (prxattrib->encrypt) {
                case _WEP40_:
                case _WEP104_:
                        rtw_wep_decrypt(padapter, (u8 *)precv_frame);
                        break;
                case _TKIP_:
                        res = rtw_tkip_decrypt(padapter, (u8 *)precv_frame);
                        break;
                case _AES_:
                        res = rtw_aes_decrypt(padapter, (u8 *)precv_frame);
                        break;
                default:
                        break;
                }
        } else if (prxattrib->bdecrypted == 1 && prxattrib->encrypt > 0 &&
                   (psecuritypriv->busetkipkey == 1 || prxattrib->encrypt != _TKIP_))
                        psecuritypriv->hw_decrypted = true;

        if (res == _FAIL) {
                rtw_free_recvframe(return_packet, &padapter->recvpriv.free_recv_queue);
                return_packet = NULL;
        }

        return return_packet;
}

/* set the security information in the recv_frame */
static struct recv_frame *portctrl(struct adapter *adapter,
                                   struct recv_frame *precv_frame)
{
        u8   *psta_addr, *ptr;
        uint  auth_alg;
        struct recv_frame *pfhdr;
        struct sta_info *psta;
        struct sta_priv *pstapriv;
        struct recv_frame *prtnframe;
        u16     ether_type;
        u16  eapol_type = 0x888e;/* for Funia BD's WPA issue */
        struct rx_pkt_attrib *pattrib;
        __be16 be_tmp;

        pstapriv = &adapter->stapriv;

        auth_alg = adapter->securitypriv.dot11AuthAlgrthm;

        ptr = precv_frame->rx_data;
        pfhdr = precv_frame;
        pattrib = &pfhdr->attrib;
        psta_addr = pattrib->ta;
        psta = rtw_get_stainfo(pstapriv, psta_addr);

        prtnframe = NULL;

        RT_TRACE(_module_rtl871x_recv_c_, _drv_info_, ("########portctrl:adapter->securitypriv.dot11AuthAlgrthm=%d\n", adapter->securitypriv.dot11AuthAlgrthm));

        if (auth_alg == 2) {
                /* get ether_type */
                ptr = ptr + pfhdr->attrib.hdrlen + LLC_HEADER_SIZE;
                memcpy(&be_tmp, ptr, 2);
                ether_type = ntohs(be_tmp);

                if ((psta != NULL) && (psta->ieee8021x_blocked)) {
                        /* blocked */
                        /* only accept EAPOL frame */
                        RT_TRACE(_module_rtl871x_recv_c_, _drv_info_, ("########portctrl:psta->ieee8021x_blocked==1\n"));

                        if (ether_type == eapol_type) {
                                prtnframe = precv_frame;
                        } else {
                                /* free this frame */
                                rtw_free_recvframe(precv_frame, &adapter->recvpriv.free_recv_queue);
                                prtnframe = NULL;
                        }
                } else {
                        /* allowed */
                        /* check decryption status, and decrypt the frame if needed */
                        RT_TRACE(_module_rtl871x_recv_c_, _drv_info_, ("########portctrl:psta->ieee8021x_blocked==0\n"));
                        RT_TRACE(_module_rtl871x_recv_c_, _drv_info_,
                                 ("portctrl:precv_frame->hdr.attrib.privacy=%x\n",
                                 precv_frame->attrib.privacy));

                        if (pattrib->bdecrypted == 0)
                                RT_TRACE(_module_rtl871x_recv_c_, _drv_info_, ("portctrl:prxstat->decrypted=%x\n", pattrib->bdecrypted));

                        prtnframe = precv_frame;
                        /* check is the EAPOL frame or not (Rekey) */
                        if (ether_type == eapol_type) {
                                RT_TRACE(_module_rtl871x_recv_c_, _drv_notice_, ("########portctrl:ether_type==0x888e\n"));
                                /* check Rekey */

                                prtnframe = precv_frame;
                        } else {
                                RT_TRACE(_module_rtl871x_recv_c_, _drv_info_, ("########portctrl:ether_type=0x%04x\n", ether_type));
                        }
                }
        } else {
                prtnframe = precv_frame;
        }

                return prtnframe;
}

static int recv_decache(struct recv_frame *precv_frame, u8 bretry,
                        struct stainfo_rxcache *prxcache)
{
        int tid = precv_frame->attrib.priority;

        u16 seq_ctrl = ((precv_frame->attrib.seq_num&0xffff) << 4) |
                (precv_frame->attrib.frag_num & 0xf);

        if (tid > 15) {
                RT_TRACE(_module_rtl871x_recv_c_, _drv_notice_, ("recv_decache, (tid>15)! seq_ctrl=0x%x, tid=0x%x\n", seq_ctrl, tid));

                return _FAIL;
        }

        if (1) {/* if (bretry) */
                if (seq_ctrl == prxcache->tid_rxseq[tid]) {
                        RT_TRACE(_module_rtl871x_recv_c_, _drv_notice_, ("recv_decache, seq_ctrl=0x%x, tid=0x%x, tid_rxseq=0x%x\n", seq_ctrl, tid, prxcache->tid_rxseq[tid]));

                        return _FAIL;
                }
        }

        prxcache->tid_rxseq[tid] = seq_ctrl;

        return _SUCCESS;
}

static void process_pwrbit_data(struct adapter *padapter,
                                struct recv_frame *precv_frame)
{
#ifdef CONFIG_88EU_AP_MODE
        unsigned char pwrbit;
        u8 *ptr = precv_frame->rx_data;
        struct rx_pkt_attrib *pattrib = &precv_frame->attrib;
        struct sta_priv *pstapriv = &padapter->stapriv;
        struct sta_info *psta = NULL;

        psta = rtw_get_stainfo(pstapriv, pattrib->src);

        pwrbit = GetPwrMgt(ptr);

        if (psta) {
                if (pwrbit) {
                        if (!(psta->state & WIFI_SLEEP_STATE))
                                stop_sta_xmit(padapter, psta);
                } else {
                        if (psta->state & WIFI_SLEEP_STATE)
                                wakeup_sta_to_xmit(padapter, psta);
                }
        }

#endif
}

static void process_wmmps_data(struct adapter *padapter,
                               struct recv_frame *precv_frame)
{
#ifdef CONFIG_88EU_AP_MODE
        struct rx_pkt_attrib *pattrib = &precv_frame->attrib;
        struct sta_priv *pstapriv = &padapter->stapriv;
        struct sta_info *psta = NULL;

        psta = rtw_get_stainfo(pstapriv, pattrib->src);

        if (!psta)
                return;

        if (!psta->qos_option)
                return;

        if (!(psta->qos_info&0xf))
                return;

        if (psta->state&WIFI_SLEEP_STATE) {
                u8 wmmps_ac = 0;

                switch (pattrib->priority) {
                case 1:
                case 2:
                        wmmps_ac = psta->uapsd_bk&BIT(1);
                        break;
                case 4:
                case 5:
                        wmmps_ac = psta->uapsd_vi&BIT(1);
                        break;
                case 6:
                case 7:
                        wmmps_ac = psta->uapsd_vo&BIT(1);
                        break;
                case 0:
                case 3:
                default:
                        wmmps_ac = psta->uapsd_be&BIT(1);
                        break;
                }

                if (wmmps_ac) {
                        if (psta->sleepq_ac_len > 0) {
                                /* process received triggered frame */
                                xmit_delivery_enabled_frames(padapter, psta);
                        } else {
                                /* issue one qos null frame with More data bit = 0 and the EOSP bit set (= 1) */
                                issue_qos_nulldata(padapter, psta->hwaddr, (u16)pattrib->priority, 0, 0);
                        }
                }
        }

#endif
}

static void count_rx_stats(struct adapter *padapter,
                           struct recv_frame *prframe,
                           struct sta_info *sta)
{
        int     sz;
        struct sta_info         *psta = NULL;
        struct stainfo_stats    *pstats = NULL;
        struct rx_pkt_attrib    *pattrib = &prframe->attrib;
        struct recv_priv        *precvpriv = &padapter->recvpriv;

        sz = prframe->len;
        precvpriv->rx_bytes += sz;

        padapter->mlmepriv.LinkDetectInfo.NumRxOkInPeriod++;

        if ((!MacAddr_isBcst(pattrib->dst)) && (!IS_MCAST(pattrib->dst)))
                padapter->mlmepriv.LinkDetectInfo.NumRxUnicastOkInPeriod++;

        if (sta)
                psta = sta;
        else
                psta = prframe->psta;

        if (psta) {
                pstats = &psta->sta_stats;

                pstats->rx_data_pkts++;
                pstats->rx_bytes += sz;
        }
}

int sta2sta_data_frame(
        struct adapter *adapter,
        struct recv_frame *precv_frame,
        struct sta_info **psta
);

int sta2sta_data_frame(struct adapter *adapter, struct recv_frame *precv_frame,
                       struct sta_info **psta)
{
        u8 *ptr = precv_frame->rx_data;
        int ret = _SUCCESS;
        struct rx_pkt_attrib *pattrib = &precv_frame->attrib;
        struct  sta_priv *pstapriv = &adapter->stapriv;
        struct  mlme_priv *pmlmepriv = &adapter->mlmepriv;
        u8 *mybssid  = get_bssid(pmlmepriv);
        u8 *myhwaddr = myid(&adapter->eeprompriv);
        u8 *sta_addr = NULL;
        int bmcast = IS_MCAST(pattrib->dst);

        if ((check_fwstate(pmlmepriv, WIFI_ADHOC_STATE) == true) ||
            (check_fwstate(pmlmepriv, WIFI_ADHOC_MASTER_STATE) == true)) {
                /*  filter packets that SA is myself or multicast or broadcast */
                if (!memcmp(myhwaddr, pattrib->src, ETH_ALEN)) {
                        RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, (" SA==myself\n"));
                        ret = _FAIL;
                        goto exit;
                }

                if ((memcmp(myhwaddr, pattrib->dst, ETH_ALEN)) && (!bmcast)) {
                        ret = _FAIL;
                        goto exit;
                }

                if (!memcmp(pattrib->bssid, "\x0\x0\x0\x0\x0\x0", ETH_ALEN) ||
                    !memcmp(mybssid, "\x0\x0\x0\x0\x0\x0", ETH_ALEN) ||
                    memcmp(pattrib->bssid, mybssid, ETH_ALEN)) {
                        ret = _FAIL;
                        goto exit;
                }

                sta_addr = pattrib->src;
        } else if (check_fwstate(pmlmepriv, WIFI_STATION_STATE)) {
                /*  For Station mode, sa and bssid should always be BSSID, and DA is my mac-address */
                if (memcmp(pattrib->bssid, pattrib->src, ETH_ALEN)) {
                        RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, ("bssid!=TA under STATION_MODE; drop pkt\n"));
                        ret = _FAIL;
                        goto exit;
                }
                sta_addr = pattrib->bssid;
        } else if (check_fwstate(pmlmepriv, WIFI_AP_STATE)) {
                if (bmcast) {
                        /*  For AP mode, if DA == MCAST, then BSSID should be also MCAST */
                        if (!IS_MCAST(pattrib->bssid)) {
                                        ret = _FAIL;
                                        goto exit;
                        }
                } else { /*  not mc-frame */
                        /*  For AP mode, if DA is non-MCAST, then it must be BSSID, and bssid == BSSID */
                        if (memcmp(pattrib->bssid, pattrib->dst, ETH_ALEN)) {
                                ret = _FAIL;
                                goto exit;
                        }

                        sta_addr = pattrib->src;
                }
        } else if (check_fwstate(pmlmepriv, WIFI_MP_STATE)) {
                memcpy(pattrib->dst, GetAddr1Ptr(ptr), ETH_ALEN);
                memcpy(pattrib->src, GetAddr2Ptr(ptr), ETH_ALEN);
                memcpy(pattrib->bssid, GetAddr3Ptr(ptr), ETH_ALEN);
                memcpy(pattrib->ra, pattrib->dst, ETH_ALEN);
                memcpy(pattrib->ta, pattrib->src, ETH_ALEN);

                sta_addr = mybssid;
        } else {
                ret  = _FAIL;
        }

        if (bmcast)
                *psta = rtw_get_bcmc_stainfo(adapter);
        else
                *psta = rtw_get_stainfo(pstapriv, sta_addr); /*  get ap_info */

        if (*psta == NULL) {
                RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, ("can't get psta under sta2sta_data_frame ; drop pkt\n"));
                ret = _FAIL;
                goto exit;
        }

exit:
        return ret;
}

static int ap2sta_data_frame(
        struct adapter *adapter,
        struct recv_frame *precv_frame,
        struct sta_info **psta)
{
        u8 *ptr = precv_frame->rx_data;
        struct rx_pkt_attrib *pattrib = &precv_frame->attrib;
        int ret = _SUCCESS;
        struct  sta_priv *pstapriv = &adapter->stapriv;
        struct  mlme_priv *pmlmepriv = &adapter->mlmepriv;
        u8 *mybssid  = get_bssid(pmlmepriv);
        u8 *myhwaddr = myid(&adapter->eeprompriv);
        int bmcast = IS_MCAST(pattrib->dst);

        if ((check_fwstate(pmlmepriv, WIFI_STATION_STATE) == true) &&
            (check_fwstate(pmlmepriv, _FW_LINKED) == true ||
            check_fwstate(pmlmepriv, _FW_UNDER_LINKING))) {
                /*  filter packets that SA is myself or multicast or broadcast */
                if (!memcmp(myhwaddr, pattrib->src, ETH_ALEN)) {
                        RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, (" SA==myself\n"));
                        ret = _FAIL;
                        goto exit;
                }

                /*  da should be for me */
                if ((memcmp(myhwaddr, pattrib->dst, ETH_ALEN)) && (!bmcast)) {
                        RT_TRACE(_module_rtl871x_recv_c_, _drv_info_,
                                 (" ap2sta_data_frame:  compare DA fail; DA=%pM\n", (pattrib->dst)));
                        ret = _FAIL;
                        goto exit;
                }

                /*  check BSSID */
                if (!memcmp(pattrib->bssid, "\x0\x0\x0\x0\x0\x0", ETH_ALEN) ||
                    !memcmp(mybssid, "\x0\x0\x0\x0\x0\x0", ETH_ALEN) ||
                     (memcmp(pattrib->bssid, mybssid, ETH_ALEN))) {
                        RT_TRACE(_module_rtl871x_recv_c_, _drv_info_,
                                 (" ap2sta_data_frame:  compare BSSID fail ; BSSID=%pM\n", (pattrib->bssid)));
                        RT_TRACE(_module_rtl871x_recv_c_, _drv_info_, ("mybssid=%pM\n", (mybssid)));

                        if (!bmcast) {
                                DBG_88E("issue_deauth to the nonassociated ap=%pM for the reason(7)\n", (pattrib->bssid));
                                issue_deauth(adapter, pattrib->bssid, WLAN_REASON_CLASS3_FRAME_FROM_NONASSOC_STA);
                        }

                        ret = _FAIL;
                        goto exit;
                }

                if (bmcast)
                        *psta = rtw_get_bcmc_stainfo(adapter);
                else
                        *psta = rtw_get_stainfo(pstapriv, pattrib->bssid); /*  get ap_info */

                if (*psta == NULL) {
                        RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, ("ap2sta: can't get psta under STATION_MODE ; drop pkt\n"));
                        ret = _FAIL;
                        goto exit;
                }

                /* if ((GetFrameSubType(ptr) & WIFI_QOS_DATA_TYPE) == WIFI_QOS_DATA_TYPE) { */
                /*  */

                if (GetFrameSubType(ptr) & BIT(6)) {
                        /* No data, will not indicate to upper layer, temporily count it here */
                        count_rx_stats(adapter, precv_frame, *psta);
                        ret = RTW_RX_HANDLED;
                        goto exit;
                }
        } else if ((check_fwstate(pmlmepriv, WIFI_MP_STATE) == true) &&
                   (check_fwstate(pmlmepriv, _FW_LINKED) == true)) {
                memcpy(pattrib->dst, GetAddr1Ptr(ptr), ETH_ALEN);
                memcpy(pattrib->src, GetAddr2Ptr(ptr), ETH_ALEN);
                memcpy(pattrib->bssid, GetAddr3Ptr(ptr), ETH_ALEN);
                memcpy(pattrib->ra, pattrib->dst, ETH_ALEN);
                memcpy(pattrib->ta, pattrib->src, ETH_ALEN);

                /*  */
                memcpy(pattrib->bssid,  mybssid, ETH_ALEN);

                *psta = rtw_get_stainfo(pstapriv, pattrib->bssid); /*  get sta_info */
                if (*psta == NULL) {
                        RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, ("can't get psta under MP_MODE ; drop pkt\n"));
                        ret = _FAIL;
                        goto exit;
                }
        } else if (check_fwstate(pmlmepriv, WIFI_AP_STATE)) {
                /* Special case */
                ret = RTW_RX_HANDLED;
                goto exit;
        } else {
                if (!memcmp(myhwaddr, pattrib->dst, ETH_ALEN) && (!bmcast)) {
                        *psta = rtw_get_stainfo(pstapriv, pattrib->bssid); /*  get sta_info */
                        if (*psta == NULL) {
                                DBG_88E("issue_deauth to the ap =%pM for the reason(7)\n", (pattrib->bssid));

                                issue_deauth(adapter, pattrib->bssid, WLAN_REASON_CLASS3_FRAME_FROM_NONASSOC_STA);
                        }
                }

                ret = _FAIL;
        }

exit:

        return ret;
}

static int sta2ap_data_frame(struct adapter *adapter,
                             struct recv_frame *precv_frame,
                             struct sta_info **psta)
{
        struct rx_pkt_attrib *pattrib = &precv_frame->attrib;
        struct  sta_priv *pstapriv = &adapter->stapriv;
        struct  mlme_priv *pmlmepriv = &adapter->mlmepriv;
        u8 *ptr = precv_frame->rx_data;
        unsigned char *mybssid  = get_bssid(pmlmepriv);
        int ret = _SUCCESS;

        if (check_fwstate(pmlmepriv, WIFI_AP_STATE) == true) {
                /* For AP mode, RA = BSSID, TX = STA(SRC_ADDR), A3 = DST_ADDR */
                if (memcmp(pattrib->bssid, mybssid, ETH_ALEN)) {
                        ret = _FAIL;
                        goto exit;
                }

                *psta = rtw_get_stainfo(pstapriv, pattrib->src);
                if (*psta == NULL) {
                        RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, ("can't get psta under AP_MODE; drop pkt\n"));
                        DBG_88E("issue_deauth to sta=%pM for the reason(7)\n", (pattrib->src));

                        issue_deauth(adapter, pattrib->src, WLAN_REASON_CLASS3_FRAME_FROM_NONASSOC_STA);

                        ret = RTW_RX_HANDLED;
                        goto exit;
                }

                process_pwrbit_data(adapter, precv_frame);

                if ((GetFrameSubType(ptr) & WIFI_QOS_DATA_TYPE) == WIFI_QOS_DATA_TYPE)
                        process_wmmps_data(adapter, precv_frame);

                if (GetFrameSubType(ptr) & BIT(6)) {
                        /* No data, will not indicate to upper layer, temporily count it here */
                        count_rx_stats(adapter, precv_frame, *psta);
                        ret = RTW_RX_HANDLED;
                        goto exit;
                }
        } else {
                u8 *myhwaddr = myid(&adapter->eeprompriv);
                if (memcmp(pattrib->ra, myhwaddr, ETH_ALEN)) {
                        ret = RTW_RX_HANDLED;
                        goto exit;
                }
                DBG_88E("issue_deauth to sta=%pM for the reason(7)\n", (pattrib->src));
                issue_deauth(adapter, pattrib->src, WLAN_REASON_CLASS3_FRAME_FROM_NONASSOC_STA);
                ret = RTW_RX_HANDLED;
                goto exit;
        }

exit:

        return ret;
}

static int validate_recv_ctrl_frame(struct adapter *padapter,
                                    struct recv_frame *precv_frame)
{
#ifdef CONFIG_88EU_AP_MODE
        struct rx_pkt_attrib *pattrib = &precv_frame->attrib;
        struct sta_priv *pstapriv = &padapter->stapriv;
        u8 *pframe = precv_frame->rx_data;

        if (GetFrameType(pframe) != WIFI_CTRL_TYPE)
                return _FAIL;

        /* receive the frames that ra(a1) is my address */
        if (memcmp(GetAddr1Ptr(pframe), myid(&padapter->eeprompriv), ETH_ALEN))
                return _FAIL;

        /* only handle ps-poll */
        if (GetFrameSubType(pframe) == WIFI_PSPOLL) {
                u16 aid;
                u8 wmmps_ac = 0;
                struct sta_info *psta = NULL;

                aid = GetAid(pframe);
                psta = rtw_get_stainfo(pstapriv, GetAddr2Ptr(pframe));

                if ((psta == NULL) || (psta->aid != aid))
                        return _FAIL;

                /* for rx pkt statistics */
                psta->sta_stats.rx_ctrl_pkts++;

                switch (pattrib->priority) {
                case 1:
                case 2:
                        wmmps_ac = psta->uapsd_bk&BIT(0);
                        break;
                case 4:
                case 5:
                        wmmps_ac = psta->uapsd_vi&BIT(0);
                        break;
                case 6:
                case 7:
                        wmmps_ac = psta->uapsd_vo&BIT(0);
                        break;
                case 0:
                case 3:
                default:
                        wmmps_ac = psta->uapsd_be&BIT(0);
                        break;
                }

                if (wmmps_ac)
                        return _FAIL;

                if (psta->state & WIFI_STA_ALIVE_CHK_STATE) {
                        DBG_88E("%s alive check-rx ps-poll\n", __func__);
                        psta->expire_to = pstapriv->expire_to;
                        psta->state ^= WIFI_STA_ALIVE_CHK_STATE;
                }

                if ((psta->state&WIFI_SLEEP_STATE) && (pstapriv->sta_dz_bitmap&BIT(psta->aid))) {
                        struct list_head *xmitframe_plist, *xmitframe_phead;
                        struct xmit_frame *pxmitframe = NULL;

                        spin_lock_bh(&psta->sleep_q.lock);

                        xmitframe_phead = get_list_head(&psta->sleep_q);
                        xmitframe_plist = xmitframe_phead->next;

                        if (xmitframe_phead != xmitframe_plist) {

                                pxmitframe = container_of(xmitframe_plist, struct xmit_frame, list);

                                xmitframe_plist = xmitframe_plist->next;

                                list_del_init(&pxmitframe->list);

                                psta->sleepq_len--;

                                if (psta->sleepq_len > 0)
                                        pxmitframe->attrib.mdata = 1;
                                else
                                        pxmitframe->attrib.mdata = 0;

                                pxmitframe->attrib.triggered = 1;

                                spin_unlock_bh(&psta->sleep_q.lock);
                                if (rtw_hal_xmit(padapter, pxmitframe) == true)
                                        rtw_os_xmit_complete(padapter, pxmitframe);
                                spin_lock_bh(&psta->sleep_q.lock);

                                if (psta->sleepq_len == 0) {
                                        pstapriv->tim_bitmap &= ~BIT(psta->aid);

                                        /* update BCN for TIM IE */
                                        /* update_BCNTIM(padapter); */
                                        update_beacon(padapter, _TIM_IE_, NULL, false);
                                }
                        } else {
                                if (pstapriv->tim_bitmap&BIT(psta->aid)) {
                                        if (psta->sleepq_len == 0) {
                                                DBG_88E("no buffered packets to xmit\n");

                                                /* issue nulldata with More data bit = 0 to indicate we have no buffered packets */
                                                issue_nulldata(padapter, psta->hwaddr, 0, 0, 0);
                                        } else {
                                                DBG_88E("error!psta->sleepq_len=%d\n", psta->sleepq_len);
                                                psta->sleepq_len = 0;
                                        }

                                        pstapriv->tim_bitmap &= ~BIT(psta->aid);

                                        /* update BCN for TIM IE */
                                        /* update_BCNTIM(padapter); */
                                        update_beacon(padapter, _TIM_IE_, NULL, false);
                                }
                        }

                        spin_unlock_bh(&psta->sleep_q.lock);
                }
        }

#endif

        return _FAIL;
}

struct recv_frame *recvframe_chk_defrag(struct adapter *padapter,
                                        struct recv_frame *precv_frame);

static int validate_recv_mgnt_frame(struct adapter *padapter,
                                    struct recv_frame *precv_frame)
{
        struct sta_info *psta;

        RT_TRACE(_module_rtl871x_recv_c_, _drv_info_, ("+validate_recv_mgnt_frame\n"));

        precv_frame = recvframe_chk_defrag(padapter, precv_frame);
        if (precv_frame == NULL) {
                RT_TRACE(_module_rtl871x_recv_c_, _drv_notice_, ("%s: fragment packet\n", __func__));
                return _SUCCESS;
        }

        /* for rx pkt statistics */
        psta = rtw_get_stainfo(&padapter->stapriv,
                               GetAddr2Ptr(precv_frame->rx_data));
        if (psta) {
                psta->sta_stats.rx_mgnt_pkts++;
                if (GetFrameSubType(precv_frame->rx_data) == WIFI_BEACON) {
                        psta->sta_stats.rx_beacon_pkts++;
                } else if (GetFrameSubType(precv_frame->rx_data) == WIFI_PROBEREQ) {
                        psta->sta_stats.rx_probereq_pkts++;
                } else if (GetFrameSubType(precv_frame->rx_data) == WIFI_PROBERSP) {
                        if (!memcmp(padapter->eeprompriv.mac_addr,
                                    GetAddr1Ptr(precv_frame->rx_data), ETH_ALEN))
                                psta->sta_stats.rx_probersp_pkts++;
                        else if (is_broadcast_mac_addr(GetAddr1Ptr(precv_frame->rx_data)) ||
                                 is_multicast_mac_addr(GetAddr1Ptr(precv_frame->rx_data)))
                                psta->sta_stats.rx_probersp_bm_pkts++;
                        else
                                psta->sta_stats.rx_probersp_uo_pkts++;
                }
        }

        mgt_dispatcher(padapter, precv_frame);

        return _SUCCESS;
}

static int validate_recv_data_frame(struct adapter *adapter,
                                    struct recv_frame *precv_frame)
{
        u8 bretry;
        u8 *psa, *pda, *pbssid;
        struct sta_info *psta = NULL;
        u8 *ptr = precv_frame->rx_data;
        struct rx_pkt_attrib    *pattrib = &precv_frame->attrib;
        struct security_priv    *psecuritypriv = &adapter->securitypriv;
        int ret = _SUCCESS;

        bretry = GetRetry(ptr);
        pda = get_da(ptr);
        psa = get_sa(ptr);
        pbssid = get_hdr_bssid(ptr);

        if (pbssid == NULL) {
                ret = _FAIL;
                goto exit;
        }

        memcpy(pattrib->dst, pda, ETH_ALEN);
        memcpy(pattrib->src, psa, ETH_ALEN);

        memcpy(pattrib->bssid, pbssid, ETH_ALEN);

        switch (pattrib->to_fr_ds) {
        case 0:
                memcpy(pattrib->ra, pda, ETH_ALEN);
                memcpy(pattrib->ta, psa, ETH_ALEN);
                ret = sta2sta_data_frame(adapter, precv_frame, &psta);
                break;
        case 1:
                memcpy(pattrib->ra, pda, ETH_ALEN);
                memcpy(pattrib->ta, pbssid, ETH_ALEN);
                ret = ap2sta_data_frame(adapter, precv_frame, &psta);
                break;
        case 2:
                memcpy(pattrib->ra, pbssid, ETH_ALEN);
                memcpy(pattrib->ta, psa, ETH_ALEN);
                ret = sta2ap_data_frame(adapter, precv_frame, &psta);
                break;
        case 3:
                memcpy(pattrib->ra, GetAddr1Ptr(ptr), ETH_ALEN);
                memcpy(pattrib->ta, GetAddr2Ptr(ptr), ETH_ALEN);
                ret = _FAIL;
                RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, (" case 3\n"));
                break;
        default:
                ret = _FAIL;
                break;
        }

        if (ret == _FAIL) {
                goto exit;
        } else if (ret == RTW_RX_HANDLED) {
                goto exit;
        }

        if (psta == NULL) {
                RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, (" after to_fr_ds_chk; psta==NULL\n"));
                ret = _FAIL;
                goto exit;
        }

        /* psta->rssi = prxcmd->rssi; */
        /* psta->signal_quality = prxcmd->sq; */
        precv_frame->psta = psta;

        pattrib->amsdu = 0;
        pattrib->ack_policy = 0;
        /* parsing QC field */
        if (pattrib->qos == 1) {
                pattrib->priority = GetPriority((ptr + 24));
                pattrib->ack_policy = GetAckpolicy((ptr + 24));
                pattrib->amsdu = GetAMsdu((ptr + 24));
                pattrib->hdrlen = pattrib->to_fr_ds == 3 ? 32 : 26;

                if (pattrib->priority != 0 && pattrib->priority != 3)
                        adapter->recvpriv.bIsAnyNonBEPkts = true;
        } else {
                pattrib->priority = 0;
                pattrib->hdrlen = pattrib->to_fr_ds == 3 ? 30 : 24;
        }

        if (pattrib->order)/* HT-CTRL 11n */
                pattrib->hdrlen += 4;

        precv_frame->preorder_ctrl = &psta->recvreorder_ctrl[pattrib->priority];

        /*  decache, drop duplicate recv packets */
        if (recv_decache(precv_frame, bretry, &psta->sta_recvpriv.rxcache) == _FAIL) {
                RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, ("decache : drop pkt\n"));
                ret = _FAIL;
                goto exit;
        }

        if (pattrib->privacy) {
                RT_TRACE(_module_rtl871x_recv_c_, _drv_info_, ("validate_recv_data_frame:pattrib->privacy=%x\n", pattrib->privacy));
                RT_TRACE(_module_rtl871x_recv_c_, _drv_info_, ("\n ^^^^^^^^^^^IS_MCAST(pattrib->ra(0x%02x))=%d^^^^^^^^^^^^^^^6\n", pattrib->ra[0], IS_MCAST(pattrib->ra)));

                GET_ENCRY_ALGO(psecuritypriv, psta, pattrib->encrypt, IS_MCAST(pattrib->ra));

                RT_TRACE(_module_rtl871x_recv_c_, _drv_info_, ("\n pattrib->encrypt=%d\n", pattrib->encrypt));

                SET_ICE_IV_LEN(pattrib->iv_len, pattrib->icv_len, pattrib->encrypt);
        } else {
                pattrib->encrypt = 0;
                pattrib->iv_len = 0;
                pattrib->icv_len = 0;
        }

exit:

        return ret;
}

static int validate_recv_frame(struct adapter *adapter,
                               struct recv_frame *precv_frame)
{
        /* shall check frame subtype, to / from ds, da, bssid */

        /* then call check if rx seq/frag. duplicated. */

        u8 type;
        u8 subtype;
        int retval = _SUCCESS;
        u8 bDumpRxPkt;
        struct rx_pkt_attrib *pattrib = &precv_frame->attrib;
        u8 *ptr = precv_frame->rx_data;
        u8  ver = (unsigned char)(*ptr)&0x3;
        struct mlme_ext_priv *pmlmeext = &adapter->mlmeextpriv;

        if (pmlmeext->sitesurvey_res.state == SCAN_PROCESS) {
                int ch_set_idx = rtw_ch_set_search_ch(pmlmeext->channel_set, rtw_get_oper_ch(adapter));
                if (ch_set_idx >= 0)
                        pmlmeext->channel_set[ch_set_idx].rx_count++;
        }

        /* add version chk */
        if (ver != 0) {
                RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, ("validate_recv_data_frame fail! (ver!=0)\n"));
                retval = _FAIL;
                goto exit;
        }

        type =  GetFrameType(ptr);
        subtype = GetFrameSubType(ptr); /* bit(7)~bit(2) */

        pattrib->to_fr_ds = get_tofr_ds(ptr);

        pattrib->frag_num = GetFragNum(ptr);
        pattrib->seq_num = GetSequence(ptr);

        pattrib->pw_save = GetPwrMgt(ptr);
        pattrib->mfrag = GetMFrag(ptr);
        pattrib->mdata = GetMData(ptr);
        pattrib->privacy = GetPrivacy(ptr);
        pattrib->order = GetOrder(ptr);

        /* Dump rx packets */
        rtw_hal_get_def_var(adapter, HAL_DEF_DBG_DUMP_RXPKT, &(bDumpRxPkt));
        if (bDumpRxPkt == 1) {/* dump all rx packets */
                if (_drv_err_ <= GlobalDebugLevel) {
                        pr_info(DRIVER_PREFIX "#############################\n");
                        print_hex_dump(KERN_INFO, DRIVER_PREFIX, DUMP_PREFIX_NONE,
                                        16, 1, ptr, 64, false);
                        pr_info(DRIVER_PREFIX "#############################\n");
                }
        } else if (bDumpRxPkt == 2) {
                if ((_drv_err_ <= GlobalDebugLevel) && (type == WIFI_MGT_TYPE)) {
                        pr_info(DRIVER_PREFIX "#############################\n");
                        print_hex_dump(KERN_INFO, DRIVER_PREFIX, DUMP_PREFIX_NONE,
                                        16, 1, ptr, 64, false);
                        pr_info(DRIVER_PREFIX "#############################\n");
                }
        } else if (bDumpRxPkt == 3) {
                if ((_drv_err_ <= GlobalDebugLevel) && (type == WIFI_DATA_TYPE)) {
                        pr_info(DRIVER_PREFIX "#############################\n");
                        print_hex_dump(KERN_INFO, DRIVER_PREFIX, DUMP_PREFIX_NONE,
                                        16, 1, ptr, 64, false);
                        pr_info(DRIVER_PREFIX "#############################\n");
                }
        }
        switch (type) {
        case WIFI_MGT_TYPE: /* mgnt */
                retval = validate_recv_mgnt_frame(adapter, precv_frame);
                if (retval == _FAIL)
                        RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, ("validate_recv_mgnt_frame fail\n"));
                retval = _FAIL; /*  only data frame return _SUCCESS */
                break;
        case WIFI_CTRL_TYPE: /* ctrl */
                retval = validate_recv_ctrl_frame(adapter, precv_frame);
                if (retval == _FAIL)
                        RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, ("validate_recv_ctrl_frame fail\n"));
                retval = _FAIL; /*  only data frame return _SUCCESS */
                break;
        case WIFI_DATA_TYPE: /* data */
                rtw_led_control(adapter, LED_CTL_RX);
                pattrib->qos = (subtype & BIT(7)) ? 1 : 0;
                retval = validate_recv_data_frame(adapter, precv_frame);
                if (retval == _FAIL) {
                        struct recv_priv *precvpriv = &adapter->recvpriv;
                        precvpriv->rx_drop++;
                }
                break;
        default:
                RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, ("validate_recv_data_frame fail! type= 0x%x\n", type));
                retval = _FAIL;
                break;
        }

        /*
         * This is the last moment before management and control frames get
         * discarded. So we need to forward them to the monitor now or never.
         *
         * At the same time data frames can still be encrypted if software
         * decryption is in use. However, decryption can occur not until later
         * (see recv_func()).
         *
         * Hence forward the frame to the monitor anyway to preserve the order
         * in which frames were received.
         */
        rtl88eu_mon_recv_hook(adapter->pmondev, precv_frame);

exit:

        return retval;
}

/* remove the wlanhdr and add the eth_hdr */

static int wlanhdr_to_ethhdr(struct recv_frame *precvframe)
{
        int     rmv_len;
        u16     eth_type, len;
        __be16 be_tmp;
        u8      bsnaphdr;
        u8      *psnap_type;
        struct ieee80211_snap_hdr       *psnap;

        struct adapter          *adapter = precvframe->adapter;
        struct mlme_priv        *pmlmepriv = &adapter->mlmepriv;
        u8 *ptr = precvframe->rx_data;
        struct rx_pkt_attrib *pattrib = &precvframe->attrib;

        if (pattrib->encrypt)
                recvframe_pull_tail(precvframe, pattrib->icv_len);

        psnap = (struct ieee80211_snap_hdr *)(ptr+pattrib->hdrlen + pattrib->iv_len);
        psnap_type = ptr+pattrib->hdrlen + pattrib->iv_len+SNAP_SIZE;
        /* convert hdr + possible LLC headers into Ethernet header */
        if ((!memcmp(psnap, rtw_rfc1042_header, SNAP_SIZE) &&
             (!memcmp(psnap_type, SNAP_ETH_TYPE_IPX, 2) == false) &&
             (!memcmp(psnap_type, SNAP_ETH_TYPE_APPLETALK_AARP, 2) == false)) ||
             !memcmp(psnap, rtw_bridge_tunnel_header, SNAP_SIZE)) {
                /* remove RFC1042 or Bridge-Tunnel encapsulation and replace EtherType */
                bsnaphdr = true;
        } else {
                /* Leave Ethernet header part of hdr and full payload */
                bsnaphdr = false;
        }

        rmv_len = pattrib->hdrlen + pattrib->iv_len + (bsnaphdr ? SNAP_SIZE : 0);
        len = precvframe->len - rmv_len;

        RT_TRACE(_module_rtl871x_recv_c_, _drv_info_,
                 ("\n===pattrib->hdrlen: %x,  pattrib->iv_len:%x===\n\n", pattrib->hdrlen,  pattrib->iv_len));

        memcpy(&be_tmp, ptr+rmv_len, 2);
        eth_type = ntohs(be_tmp); /* pattrib->ether_type */
        pattrib->eth_type = eth_type;

        if ((check_fwstate(pmlmepriv, WIFI_MP_STATE))) {
                ptr += rmv_len;
                *ptr = 0x87;
                *(ptr+1) = 0x12;

                eth_type = 0x8712;
                /*  append rx status for mp test packets */
                ptr = recvframe_pull(precvframe, (rmv_len-sizeof(struct ethhdr)+2)-24);
                memcpy(ptr, get_rxmem(precvframe), 24);
                ptr += 24;
        } else {
                ptr = recvframe_pull(precvframe, (rmv_len-sizeof(struct ethhdr) + (bsnaphdr ? 2 : 0)));
        }

        memcpy(ptr, pattrib->dst, ETH_ALEN);
        memcpy(ptr+ETH_ALEN, pattrib->src, ETH_ALEN);

        if (!bsnaphdr) {
                be_tmp = htons(len);
                memcpy(ptr+12, &be_tmp, 2);
        }

        return _SUCCESS;
}

/* perform defrag */
static struct recv_frame *recvframe_defrag(struct adapter *adapter,
                                           struct __queue *defrag_q)
{
        struct list_head *plist, *phead;
        u8 wlanhdr_offset;
        u8      curfragnum;
        struct recv_frame *pfhdr, *pnfhdr;
        struct recv_frame *prframe, *pnextrframe;
        struct __queue *pfree_recv_queue;

        curfragnum = 0;
        pfree_recv_queue = &adapter->recvpriv.free_recv_queue;

        phead = get_list_head(defrag_q);
        plist = phead->next;
        pfhdr = container_of(plist, struct recv_frame, list);
        prframe = pfhdr;
        list_del_init(&(prframe->list));

        if (curfragnum != pfhdr->attrib.frag_num) {
                /* the first fragment number must be 0 */
                /* free the whole queue */
                rtw_free_recvframe(prframe, pfree_recv_queue);
                rtw_free_recvframe_queue(defrag_q, pfree_recv_queue);

                return NULL;
        }

        curfragnum++;

        plist = get_list_head(defrag_q);

        plist = plist->next;

        while (phead != plist) {
                pnfhdr = container_of(plist, struct recv_frame, list);
                pnextrframe = pnfhdr;

                /* check the fragment sequence  (2nd ~n fragment frame) */

                if (curfragnum != pnfhdr->attrib.frag_num) {
                        /* the fragment number must be increasing  (after decache) */
                        /* release the defrag_q & prframe */
                        rtw_free_recvframe(prframe, pfree_recv_queue);
                        rtw_free_recvframe_queue(defrag_q, pfree_recv_queue);
                        return NULL;
                }

                curfragnum++;

                /* copy the 2nd~n fragment frame's payload to the first fragment */
                /* get the 2nd~last fragment frame's payload */

                wlanhdr_offset = pnfhdr->attrib.hdrlen + pnfhdr->attrib.iv_len;

                recvframe_pull(pnextrframe, wlanhdr_offset);

                /* append  to first fragment frame's tail (if privacy frame, pull the ICV) */
                recvframe_pull_tail(prframe, pfhdr->attrib.icv_len);

                /* memcpy */
                memcpy(pfhdr->rx_tail, pnfhdr->rx_data, pnfhdr->len);

                recvframe_put(prframe, pnfhdr->len);

                pfhdr->attrib.icv_len = pnfhdr->attrib.icv_len;
                plist = plist->next;
        }

        /* free the defrag_q queue and return the prframe */
        rtw_free_recvframe_queue(defrag_q, pfree_recv_queue);

        RT_TRACE(_module_rtl871x_recv_c_, _drv_info_, ("Performance defrag!!!!!\n"));

        return prframe;
}

/* check if need to defrag, if needed queue the frame to defrag_q */
struct recv_frame *recvframe_chk_defrag(struct adapter *padapter,
                                        struct recv_frame *precv_frame)
{
        u8      ismfrag;
        u8      fragnum;
        u8      *psta_addr;
        struct recv_frame *pfhdr;
        struct sta_info *psta;
        struct sta_priv *pstapriv;
        struct list_head *phead;
        struct recv_frame *prtnframe = NULL;
        struct __queue *pfree_recv_queue, *pdefrag_q;

        pstapriv = &padapter->stapriv;

        pfhdr = precv_frame;

        pfree_recv_queue = &padapter->recvpriv.free_recv_queue;

        /* need to define struct of wlan header frame ctrl */
        ismfrag = pfhdr->attrib.mfrag;
        fragnum = pfhdr->attrib.frag_num;

        psta_addr = pfhdr->attrib.ta;
        psta = rtw_get_stainfo(pstapriv, psta_addr);
        if (psta == NULL) {
                u8 type = GetFrameType(pfhdr->rx_data);
                if (type != WIFI_DATA_TYPE) {
                        psta = rtw_get_bcmc_stainfo(padapter);
                        pdefrag_q = &psta->sta_recvpriv.defrag_q;
                } else {
                        pdefrag_q = NULL;
                }
        } else {
                pdefrag_q = &psta->sta_recvpriv.defrag_q;
        }

        if ((ismfrag == 0) && (fragnum == 0))
                prtnframe = precv_frame;/* isn't a fragment frame */

        if (ismfrag == 1) {
                /* 0~(n-1) fragment frame */
                /* enqueue to defraf_g */
                if (pdefrag_q != NULL) {
                        if (fragnum == 0) {
                                /* the first fragment */
                                if (!list_empty(&pdefrag_q->queue))
                                        /* free current defrag_q */
                                        rtw_free_recvframe_queue(pdefrag_q, pfree_recv_queue);
                        }

                        /* Then enqueue the 0~(n-1) fragment into the defrag_q */

                        phead = get_list_head(pdefrag_q);
                        list_add_tail(&pfhdr->list, phead);

                        RT_TRACE(_module_rtl871x_recv_c_, _drv_info_, ("Enqueuq: ismfrag=%d, fragnum=%d\n", ismfrag, fragnum));

                        prtnframe = NULL;
                } else {
                        /* can't find this ta's defrag_queue, so free this recv_frame */
                        rtw_free_recvframe(precv_frame, pfree_recv_queue);
                        prtnframe = NULL;
                        RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, ("Free because pdefrag_q==NULL: ismfrag=%d, fragnum=%d\n", ismfrag, fragnum));
                }
        }

        if ((ismfrag == 0) && (fragnum != 0)) {
                /* the last fragment frame */
                /* enqueue the last fragment */
                if (pdefrag_q != NULL) {
                        phead = get_list_head(pdefrag_q);
                        list_add_tail(&pfhdr->list, phead);

                        /* call recvframe_defrag to defrag */
                        RT_TRACE(_module_rtl871x_recv_c_, _drv_info_, ("defrag: ismfrag=%d, fragnum=%d\n", ismfrag, fragnum));
                        precv_frame = recvframe_defrag(padapter, pdefrag_q);
                        prtnframe = precv_frame;
                } else {
                        /* can't find this ta's defrag_queue, so free this recv_frame */
                        rtw_free_recvframe(precv_frame, pfree_recv_queue);
                        prtnframe = NULL;
                        RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, ("Free because pdefrag_q==NULL: ismfrag=%d, fragnum=%d\n", ismfrag, fragnum));
                }
        }

        if ((prtnframe != NULL) && (prtnframe->attrib.privacy)) {
                /* after defrag we must check tkip mic code */
                if (recvframe_chkmic(padapter,  prtnframe) == _FAIL) {
                        RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, ("recvframe_chkmic(padapter,  prtnframe)==_FAIL\n"));
                        rtw_free_recvframe(prtnframe, pfree_recv_queue);
                        prtnframe = NULL;
                }
        }

        return prtnframe;
}

static int amsdu_to_msdu(struct adapter *padapter, struct recv_frame *prframe)
{
        int     a_len, padding_len;
        u16     eth_type, nSubframe_Length;
        u8      nr_subframes, i;
        unsigned char *pdata;
        struct rx_pkt_attrib *pattrib;
        unsigned char *data_ptr;
        struct sk_buff *sub_skb, *subframes[MAX_SUBFRAME_COUNT];
        struct recv_priv *precvpriv = &padapter->recvpriv;
        struct __queue *pfree_recv_queue = &(precvpriv->free_recv_queue);
        nr_subframes = 0;

        pattrib = &prframe->attrib;

        recvframe_pull(prframe, prframe->attrib.hdrlen);

        if (prframe->attrib.iv_len > 0)
                recvframe_pull(prframe, prframe->attrib.iv_len);

        a_len = prframe->len;

        pdata = prframe->rx_data;

        while (a_len > ETH_HLEN) {
                /* Offset 12 denote 2 mac address */
                nSubframe_Length = get_unaligned_be16(pdata + 12);

                if (a_len < (ETHERNET_HEADER_SIZE + nSubframe_Length)) {
                        DBG_88E("nRemain_Length is %d and nSubframe_Length is : %d\n", a_len, nSubframe_Length);
                        goto exit;
                }

                /* move the data point to data content */
                pdata += ETH_HLEN;
                a_len -= ETH_HLEN;

                /* Allocate new skb for releasing to upper layer */
                sub_skb = dev_alloc_skb(nSubframe_Length + 12);
                if (sub_skb) {
                        skb_reserve(sub_skb, 12);
                        data_ptr = (u8 *)skb_put(sub_skb, nSubframe_Length);
                        memcpy(data_ptr, pdata, nSubframe_Length);
                } else {
                        sub_skb = skb_clone(prframe->pkt, GFP_ATOMIC);
                        if (sub_skb) {
                                sub_skb->data = pdata;
                                sub_skb->len = nSubframe_Length;
                                skb_set_tail_pointer(sub_skb, nSubframe_Length);
                        } else {
                                DBG_88E("skb_clone() Fail!!! , nr_subframes=%d\n", nr_subframes);
                                break;
                        }
                }

                subframes[nr_subframes++] = sub_skb;

                if (nr_subframes >= MAX_SUBFRAME_COUNT) {
                        DBG_88E("ParseSubframe(): Too many Subframes! Packets dropped!\n");
                        break;
                }

                pdata += nSubframe_Length;
                a_len -= nSubframe_Length;
                if (a_len != 0) {
                        padding_len = 4 - ((nSubframe_Length + ETH_HLEN) & (4-1));
                        if (padding_len == 4)
                                padding_len = 0;

                        if (a_len < padding_len) {
                                goto exit;
                        }
                        pdata += padding_len;
                        a_len -= padding_len;
                }
        }

        for (i = 0; i < nr_subframes; i++) {
                sub_skb = subframes[i];
                /* convert hdr + possible LLC headers into Ethernet header */
                eth_type = get_unaligned_be16(&sub_skb->data[6]);
                if (sub_skb->len >= 8 &&
                    ((!memcmp(sub_skb->data, rtw_rfc1042_header, SNAP_SIZE) &&
                          eth_type != ETH_P_AARP && eth_type != ETH_P_IPX) ||
                         !memcmp(sub_skb->data, rtw_bridge_tunnel_header, SNAP_SIZE))) {
                        /* remove RFC1042 or Bridge-Tunnel encapsulation and replace EtherType */
                        skb_pull(sub_skb, SNAP_SIZE);
                        memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->src, ETH_ALEN);
                        memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->dst, ETH_ALEN);
                } else {
                        __be16 len;
                        /* Leave Ethernet header part of hdr and full payload */
                        len = htons(sub_skb->len);
                        memcpy(skb_push(sub_skb, 2), &len, 2);
                        memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->src, ETH_ALEN);
                        memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->dst, ETH_ALEN);
                }

                /* Indicate the packets to upper layer */
                /*  Insert NAT2.5 RX here! */
                sub_skb->protocol = eth_type_trans(sub_skb, padapter->pnetdev);
                sub_skb->dev = padapter->pnetdev;

                sub_skb->ip_summed = CHECKSUM_NONE;

                netif_rx(sub_skb);
        }

exit:

        prframe->len = 0;
        rtw_free_recvframe(prframe, pfree_recv_queue);/* free this recv_frame */

        return _SUCCESS;
}

static int check_indicate_seq(struct recv_reorder_ctrl *preorder_ctrl, u16 seq_num)
{
        u8      wsize = preorder_ctrl->wsize_b;
        u16     wend = (preorder_ctrl->indicate_seq + wsize - 1) & 0xFFF;/*  4096; */

        /*  Rx Reorder initialize condition. */
        if (preorder_ctrl->indicate_seq == 0xFFFF)
                preorder_ctrl->indicate_seq = seq_num;

        /*  Drop out the packet which SeqNum is smaller than WinStart */
        if (SN_LESS(seq_num, preorder_ctrl->indicate_seq))
                return false;

        /*  */
        /*  Sliding window manipulation. Conditions includes: */
        /*  1. Incoming SeqNum is equal to WinStart =>Window shift 1 */
        /*  2. Incoming SeqNum is larger than the WinEnd => Window shift N */
        /*  */
        if (SN_EQUAL(seq_num, preorder_ctrl->indicate_seq)) {
                preorder_ctrl->indicate_seq = (preorder_ctrl->indicate_seq + 1) & 0xFFF;
        } else if (SN_LESS(wend, seq_num)) {
                if (seq_num >= (wsize - 1))
                        preorder_ctrl->indicate_seq = seq_num + 1 - wsize;
                else
                        preorder_ctrl->indicate_seq = 0xFFF - (wsize - (seq_num + 1)) + 1;
        }

        return true;
}

static int enqueue_reorder_recvframe(struct recv_reorder_ctrl *preorder_ctrl,
                                     struct recv_frame *prframe)
{
        struct rx_pkt_attrib *pattrib = &prframe->attrib;
        struct __queue *ppending_recvframe_queue = &preorder_ctrl->pending_recvframe_queue;
        struct list_head *phead, *plist;
        struct recv_frame *hdr;
        struct rx_pkt_attrib *pnextattrib;

        phead = get_list_head(ppending_recvframe_queue);
        plist = phead->next;

        while (phead != plist) {
                hdr = container_of(plist, struct recv_frame, list);
                pnextattrib = &hdr->attrib;

                if (SN_LESS(pnextattrib->seq_num, pattrib->seq_num))
                        plist = plist->next;
                else if (SN_EQUAL(pnextattrib->seq_num, pattrib->seq_num))
                        return false;
                else
                        break;
        }

        list_del_init(&(prframe->list));

        list_add_tail(&(prframe->list), plist);
        return true;
}

static int recv_indicatepkts_in_order(struct adapter *padapter, struct recv_reorder_ctrl *preorder_ctrl, int bforced)
{
        struct list_head *phead, *plist;
        struct recv_frame *prframe;
        struct recv_frame *prhdr;
        struct rx_pkt_attrib *pattrib;
        int bPktInBuf = false;
        struct recv_priv *precvpriv = &padapter->recvpriv;
        struct __queue *ppending_recvframe_queue = &preorder_ctrl->pending_recvframe_queue;

        phead =         get_list_head(ppending_recvframe_queue);
        plist = phead->next;

        /*  Handling some condition for forced indicate case. */
        if (bforced) {
                if (list_empty(phead))
                        return true;

                prhdr = container_of(plist, struct recv_frame, list);
                pattrib = &prhdr->attrib;
                preorder_ctrl->indicate_seq = pattrib->seq_num;
        }

        /*  Prepare indication list and indication. */
        /*  Check if there is any packet need indicate. */
        while (!list_empty(phead)) {
                prhdr = container_of(plist, struct recv_frame, list);
                prframe = prhdr;
                pattrib = &prframe->attrib;

                if (!SN_LESS(preorder_ctrl->indicate_seq, pattrib->seq_num)) {
                        RT_TRACE(_module_rtl871x_recv_c_, _drv_notice_,
                                 ("recv_indicatepkts_in_order: indicate=%d seq=%d amsdu=%d\n",
                                  preorder_ctrl->indicate_seq, pattrib->seq_num, pattrib->amsdu));
                        plist = plist->next;
                        list_del_init(&(prframe->list));

                        if (SN_EQUAL(preorder_ctrl->indicate_seq, pattrib->seq_num))
                                preorder_ctrl->indicate_seq = (preorder_ctrl->indicate_seq + 1) & 0xFFF;

                        /* Set this as a lock to make sure that only one thread is indicating packet. */

                        /* indicate this recv_frame */
                        if (!pattrib->amsdu) {
                                if ((!padapter->bDriverStopped) &&
                                    (!padapter->bSurpriseRemoved))
                                        rtw_recv_indicatepkt(padapter, prframe);/* indicate this recv_frame */
                        } else if (pattrib->amsdu == 1) {
                                if (amsdu_to_msdu(padapter, prframe) != _SUCCESS)
                                        rtw_free_recvframe(prframe, &precvpriv->free_recv_queue);
                        } else {
                                /* error condition; */
                        }

                        /* Update local variables. */
                        bPktInBuf = false;
                } else {
                        bPktInBuf = true;
                        break;
                }
        }
        return bPktInBuf;
}

static int recv_indicatepkt_reorder(struct adapter *padapter,
                                    struct recv_frame *prframe)
{
        int retval = _SUCCESS;
        struct rx_pkt_attrib *pattrib = &prframe->attrib;
        struct recv_reorder_ctrl *preorder_ctrl = prframe->preorder_ctrl;
        struct __queue *ppending_recvframe_queue = &preorder_ctrl->pending_recvframe_queue;

        if (!pattrib->amsdu) {
                /* s1. */
                wlanhdr_to_ethhdr(prframe);

                if ((pattrib->qos != 1) || (pattrib->eth_type == 0x0806) ||
                    (pattrib->ack_policy != 0)) {
                        if ((!padapter->bDriverStopped) &&
                            (!padapter->bSurpriseRemoved)) {
                                RT_TRACE(_module_rtl871x_recv_c_, _drv_notice_, ("@@@@  recv_indicatepkt_reorder -recv_func recv_indicatepkt\n"));

                                rtw_recv_indicatepkt(padapter, prframe);
                                return _SUCCESS;
                        }

                        return _FAIL;
                }

                if (!preorder_ctrl->enable) {
                        /* indicate this recv_frame */
                        preorder_ctrl->indicate_seq = pattrib->seq_num;
                        rtw_recv_indicatepkt(padapter, prframe);

                        preorder_ctrl->indicate_seq = (preorder_ctrl->indicate_seq + 1)%4096;
                        return _SUCCESS;
                }
        } else if (pattrib->amsdu == 1) { /* temp filter -> means didn't support A-MSDUs in a A-MPDU */
                if (!preorder_ctrl->enable) {
                        preorder_ctrl->indicate_seq = pattrib->seq_num;
                        retval = amsdu_to_msdu(padapter, prframe);

                        preorder_ctrl->indicate_seq = (preorder_ctrl->indicate_seq + 1)%4096;
                        return retval;
                }
        }

        spin_lock_bh(&ppending_recvframe_queue->lock);

        RT_TRACE(_module_rtl871x_recv_c_, _drv_notice_,
                 ("recv_indicatepkt_reorder: indicate=%d seq=%d\n",
                  preorder_ctrl->indicate_seq, pattrib->seq_num));

        /* s2. check if winstart_b(indicate_seq) needs to been updated */
        if (!check_indicate_seq(preorder_ctrl, pattrib->seq_num)) {
                rtw_recv_indicatepkt(padapter, prframe);

                spin_unlock_bh(&ppending_recvframe_queue->lock);

                goto _success_exit;
        }

        /* s3. Insert all packet into Reorder Queue to maintain its ordering. */
        if (!enqueue_reorder_recvframe(preorder_ctrl, prframe))
                goto _err_exit;

        /* s4. */
        /*  Indication process. */
        /*  After Packet dropping and Sliding Window shifting as above, we can now just indicate the packets */
        /*  with the SeqNum smaller than latest WinStart and buffer other packets. */
        /*  */
        /*  For Rx Reorder condition: */
        /*  1. All packets with SeqNum smaller than WinStart => Indicate */
        /*  2. All packets with SeqNum larger than or equal to WinStart => Buffer it. */
        /*  */

        /* recv_indicatepkts_in_order(padapter, preorder_ctrl, true); */
        if (recv_indicatepkts_in_order(padapter, preorder_ctrl, false)) {
                mod_timer(&preorder_ctrl->reordering_ctrl_timer,
                          jiffies + msecs_to_jiffies(REORDER_WAIT_TIME));
                spin_unlock_bh(&ppending_recvframe_queue->lock);
        } else {
                spin_unlock_bh(&ppending_recvframe_queue->lock);
                del_timer_sync(&preorder_ctrl->reordering_ctrl_timer);
        }

_success_exit:

        return _SUCCESS;

_err_exit:

        spin_unlock_bh(&ppending_recvframe_queue->lock);

        return _FAIL;
}

void rtw_reordering_ctrl_timeout_handler(unsigned long data)
{
        struct recv_reorder_ctrl *preorder_ctrl = (struct recv_reorder_ctrl *)data;
        struct adapter *padapter = preorder_ctrl->padapter;
        struct __queue *ppending_recvframe_queue = &preorder_ctrl->pending_recvframe_queue;

        if (padapter->bDriverStopped || padapter->bSurpriseRemoved)
                return;

        spin_lock_bh(&ppending_recvframe_queue->lock);

        if (recv_indicatepkts_in_order(padapter, preorder_ctrl, true) == true)
                mod_timer(&preorder_ctrl->reordering_ctrl_timer,
                          jiffies + msecs_to_jiffies(REORDER_WAIT_TIME));

        spin_unlock_bh(&ppending_recvframe_queue->lock);
}

static int process_recv_indicatepkts(struct adapter *padapter,
                                     struct recv_frame *prframe)
{
        int retval = _SUCCESS;
        struct mlme_priv        *pmlmepriv = &padapter->mlmepriv;
        struct ht_priv  *phtpriv = &pmlmepriv->htpriv;

        if (phtpriv->ht_option) {  /* B/G/N Mode */
                if (recv_indicatepkt_reorder(padapter, prframe) != _SUCCESS) {
                        /*  including perform A-MPDU Rx Ordering Buffer Control */
                        if ((!padapter->bDriverStopped) &&
                            (!padapter->bSurpriseRemoved)) {
                                retval = _FAIL;
                                return retval;
                        }
                }
        } else { /* B/G mode */
                retval = wlanhdr_to_ethhdr(prframe);
                if (retval != _SUCCESS) {
                        RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, ("wlanhdr_to_ethhdr: drop pkt\n"));
                        return retval;
                }

                if ((!padapter->bDriverStopped) &&
                    (!padapter->bSurpriseRemoved)) {
                        /* indicate this recv_frame */
                        RT_TRACE(_module_rtl871x_recv_c_, _drv_notice_, ("@@@@ process_recv_indicatepkts- recv_func recv_indicatepkt\n"));
                        rtw_recv_indicatepkt(padapter, prframe);
                } else {
                        RT_TRACE(_module_rtl871x_recv_c_, _drv_notice_, ("@@@@ process_recv_indicatepkts- recv_func free_indicatepkt\n"));

                        RT_TRACE(_module_rtl871x_recv_c_, _drv_notice_, ("recv_func:bDriverStopped(%d) OR bSurpriseRemoved(%d)", padapter->bDriverStopped, padapter->bSurpriseRemoved));
                        retval = _FAIL;
                        return retval;
                }
        }

        return retval;
}

static int recv_func_prehandle(struct adapter *padapter,
                               struct recv_frame *rframe)
{
        int ret = _SUCCESS;
        struct __queue *pfree_recv_queue = &padapter->recvpriv.free_recv_queue;

        /* check the frame crtl field and decache */
        ret = validate_recv_frame(padapter, rframe);
        if (ret != _SUCCESS) {
                RT_TRACE(_module_rtl871x_recv_c_, _drv_info_, ("recv_func: validate_recv_frame fail! drop pkt\n"));
                rtw_free_recvframe(rframe, pfree_recv_queue);/* free this recv_frame */
                goto exit;
        }

exit:
        return ret;
}

static int recv_func_posthandle(struct adapter *padapter,
                                struct recv_frame *prframe)
{
        int ret = _SUCCESS;
        struct recv_frame *orig_prframe = prframe;
        struct recv_priv *precvpriv = &padapter->recvpriv;
        struct __queue *pfree_recv_queue = &padapter->recvpriv.free_recv_queue;

        /*  DATA FRAME */
        rtw_led_control(padapter, LED_CTL_RX);

        prframe = decryptor(padapter, prframe);
        if (prframe == NULL) {
                RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, ("decryptor: drop pkt\n"));
                ret = _FAIL;
                goto _recv_data_drop;
        }

        prframe = recvframe_chk_defrag(padapter, prframe);
        if (prframe == NULL) {
                RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, ("recvframe_chk_defrag: drop pkt\n"));
                goto _recv_data_drop;
        }

        prframe = portctrl(padapter, prframe);
        if (prframe == NULL) {
                RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, ("portctrl: drop pkt\n"));
                ret = _FAIL;
                goto _recv_data_drop;
        }

        count_rx_stats(padapter, prframe, NULL);

        ret = process_recv_indicatepkts(padapter, prframe);
        if (ret != _SUCCESS) {
                RT_TRACE(_module_rtl871x_recv_c_, _drv_err_, ("recv_func: process_recv_indicatepkts fail!\n"));
                rtw_free_recvframe(orig_prframe, pfree_recv_queue);/* free this recv_frame */
                goto _recv_data_drop;
        }
        return ret;

_recv_data_drop:
        precvpriv->rx_drop++;
        return ret;
}

static int recv_func(struct adapter *padapter, struct recv_frame *rframe)
{
        int ret;
        struct rx_pkt_attrib *prxattrib = &rframe->attrib;
        struct security_priv *psecuritypriv = &padapter->securitypriv;
        struct mlme_priv *mlmepriv = &padapter->mlmepriv;

        /* check if need to handle uc_swdec_pending_queue*/
        if (check_fwstate(mlmepriv, WIFI_STATION_STATE) && psecuritypriv->busetkipkey) {
                struct recv_frame *pending_frame;

                while ((pending_frame = rtw_alloc_recvframe(&padapter->recvpriv.uc_swdec_pending_queue))) {
                        if (recv_func_posthandle(padapter, pending_frame) == _SUCCESS)
                                DBG_88E("%s: dequeue uc_swdec_pending_queue\n", __func__);
                }
        }

        ret = recv_func_prehandle(padapter, rframe);

        if (ret == _SUCCESS) {
                /* check if need to enqueue into uc_swdec_pending_queue*/
                if (check_fwstate(mlmepriv, WIFI_STATION_STATE) &&
                    !IS_MCAST(prxattrib->ra) && prxattrib->encrypt > 0 &&
                    (prxattrib->bdecrypted == 0 || psecuritypriv->sw_decrypt) &&
                    !is_wep_enc(psecuritypriv->dot11PrivacyAlgrthm) &&
                    !psecuritypriv->busetkipkey) {
                        rtw_enqueue_recvframe(rframe, &padapter->recvpriv.uc_swdec_pending_queue);
                        DBG_88E("%s: no key, enqueue uc_swdec_pending_queue\n", __func__);
                        goto exit;
                }

                ret = recv_func_posthandle(padapter, rframe);
        }

exit:
        return ret;
}

s32 rtw_recv_entry(struct recv_frame *precvframe)
{
        struct adapter *padapter;
        struct recv_priv *precvpriv;
        s32 ret = _SUCCESS;

        padapter = precvframe->adapter;

        precvpriv = &padapter->recvpriv;

        ret = recv_func(padapter, precvframe);
        if (ret == _FAIL) {
                RT_TRACE(_module_rtl871x_recv_c_, _drv_info_, ("rtw_recv_entry: recv_func return fail!!!\n"));
                goto _recv_entry_drop;
        }

        precvpriv->rx_pkts++;

        return ret;

_recv_entry_drop:
        return ret;
}

static void rtw_signal_stat_timer_hdl(unsigned long data)
{
        struct adapter *adapter = (struct adapter *)data;
        struct recv_priv *recvpriv = &adapter->recvpriv;

        u32 tmp_s, tmp_q;
        u8 avg_signal_strength = 0;
        u8 avg_signal_qual = 0;
        u8 _alpha = 3; /*  this value is based on converging_constant = 5000 and sampling_interval = 1000 */

        if (adapter->recvpriv.is_signal_dbg) {
                /* update the user specific value, signal_strength_dbg, to signal_strength, rssi */
                adapter->recvpriv.signal_strength = adapter->recvpriv.signal_strength_dbg;
                adapter->recvpriv.rssi = (s8)translate_percentage_to_dbm((u8)adapter->recvpriv.signal_strength_dbg);
        } else {
                if (recvpriv->signal_strength_data.update_req == 0) {/*  update_req is clear, means we got rx */
                        avg_signal_strength = recvpriv->signal_strength_data.avg_val;
                        /*  after avg_vals are acquired, we can re-stat the signal values */
                        recvpriv->signal_strength_data.update_req = 1;
                }

                if (recvpriv->signal_qual_data.update_req == 0) {/*  update_req is clear, means we got rx */
                        avg_signal_qual = recvpriv->signal_qual_data.avg_val;
                        /*  after avg_vals are acquired, we can re-stat the signal values */
                        recvpriv->signal_qual_data.update_req = 1;
                }

                /* update value of signal_strength, rssi, signal_qual */
                if (check_fwstate(&adapter->mlmepriv, _FW_UNDER_SURVEY) == false) {
                        tmp_s = avg_signal_strength+(_alpha-1)*recvpriv->signal_strength;
                        if (tmp_s % _alpha)
                                tmp_s = tmp_s/_alpha + 1;
                        else
                                tmp_s = tmp_s/_alpha;
                        if (tmp_s > 100)
                                tmp_s = 100;

                        tmp_q = avg_signal_qual+(_alpha-1)*recvpriv->signal_qual;
                        if (tmp_q % _alpha)
                                tmp_q = tmp_q/_alpha + 1;
                        else
                                tmp_q = tmp_q/_alpha;
                        if (tmp_q > 100)
                                tmp_q = 100;

                        recvpriv->signal_strength = tmp_s;
                        recvpriv->rssi = (s8)translate_percentage_to_dbm(tmp_s);
                        recvpriv->signal_qual = tmp_q;
                }
        }
        rtw_set_signal_stat_timer(recvpriv);
}