kernel/drivers/staging/rtl8712/rtl8712_recv.c

   1 /******************************************************************************
   2  * rtl8712_recv.c
   3  *
   4  * Copyright(c) 2007 - 2010 Realtek Corporation. All rights reserved.
   5  * Linux device driver for RTL8192SU
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of version 2 of the GNU General Public License as
   9  * published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14  * more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along with
  17  * this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  19  *
  20  * Modifications for inclusion into the Linux staging tree are
  21  * Copyright(c) 2010 Larry Finger. All rights reserved.
  22  *
  23  * Contact information:
  24  * WLAN FAE <wlanfae@realtek.com>
  25  * Larry Finger <Larry.Finger@lwfinger.net>
  26  *
  27  ******************************************************************************/
  28
  29 #define _RTL8712_RECV_C_
  30
  31 #include <linux/if_ether.h>
  32 #include <linux/ip.h>
  33
  34 #include "osdep_service.h"
  35 #include "drv_types.h"
  36 #include "recv_osdep.h"
  37 #include "mlme_osdep.h"
  38 #include "ethernet.h"
  39 #include "usb_ops.h"
  40 #include "wifi.h"
  41
  42 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
  43 static u8 bridge_tunnel_header[] = {0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8};
  44
  45 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
  46 static u8 rfc1042_header[] = {0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00};
  47
  48 static void recv_tasklet(void *priv);
  49
  50 int r8712_init_recv_priv(struct recv_priv *precvpriv, struct _adapter *padapter)
  51 {
  52         int i;
  53         struct recv_buf *precvbuf;
  54         int res = _SUCCESS;
  55         addr_t tmpaddr = 0;
  56         int alignment = 0;
  57         struct sk_buff *pskb = NULL;
  58
  59         /*init recv_buf*/
  60         _init_queue(&precvpriv->free_recv_buf_queue);
  61         precvpriv->pallocated_recv_buf = kzalloc(NR_RECVBUFF * sizeof(struct recv_buf) + 4,
  62                                                  GFP_ATOMIC);
  63         if (precvpriv->pallocated_recv_buf == NULL)
  64                 return _FAIL;
  65         precvpriv->precv_buf = precvpriv->pallocated_recv_buf + 4 -
  66                               ((addr_t) (precvpriv->pallocated_recv_buf) & 3);
  67         precvbuf = (struct recv_buf *)precvpriv->precv_buf;
  68         for (i = 0; i < NR_RECVBUFF; i++) {
  69                 INIT_LIST_HEAD(&precvbuf->list);
  70                 spin_lock_init(&precvbuf->recvbuf_lock);
  71                 res = r8712_os_recvbuf_resource_alloc(padapter, precvbuf);
  72                 if (res == _FAIL)
  73                         break;
  74                 precvbuf->ref_cnt = 0;
  75                 precvbuf->adapter = padapter;
  76                 list_add_tail(&precvbuf->list,
  77                                  &(precvpriv->free_recv_buf_queue.queue));
  78                 precvbuf++;
  79         }
  80         precvpriv->free_recv_buf_queue_cnt = NR_RECVBUFF;
  81         tasklet_init(&precvpriv->recv_tasklet,
  82              (void(*)(unsigned long))recv_tasklet,
  83              (unsigned long)padapter);
  84         skb_queue_head_init(&precvpriv->rx_skb_queue);
  85
  86         skb_queue_head_init(&precvpriv->free_recv_skb_queue);
  87         for (i = 0; i < NR_PREALLOC_RECV_SKB; i++) {
  88                 pskb = netdev_alloc_skb(padapter->pnetdev, MAX_RECVBUF_SZ +
  89                        RECVBUFF_ALIGN_SZ);
  90                 if (pskb) {
  91                         tmpaddr = (addr_t)pskb->data;
  92                         alignment = tmpaddr & (RECVBUFF_ALIGN_SZ-1);
  93                         skb_reserve(pskb, (RECVBUFF_ALIGN_SZ - alignment));
  94                         skb_queue_tail(&precvpriv->free_recv_skb_queue, pskb);
  95                 }
  96                 pskb = NULL;
  97         }
  98         return res;
  99 }
 100
 101 void r8712_free_recv_priv(struct recv_priv *precvpriv)
 102 {
 103         int i;
 104         struct recv_buf *precvbuf;
 105         struct _adapter *padapter = precvpriv->adapter;
 106
 107         precvbuf = (struct recv_buf *)precvpriv->precv_buf;
 108         for (i = 0; i < NR_RECVBUFF; i++) {
 109                 r8712_os_recvbuf_resource_free(padapter, precvbuf);
 110                 precvbuf++;
 111         }
 112         kfree(precvpriv->pallocated_recv_buf);
 113         skb_queue_purge(&precvpriv->rx_skb_queue);
 114         if (skb_queue_len(&precvpriv->rx_skb_queue))
 115                 netdev_warn(padapter->pnetdev, "r8712u: rx_skb_queue not empty\n");
 116         skb_queue_purge(&precvpriv->free_recv_skb_queue);
 117         if (skb_queue_len(&precvpriv->free_recv_skb_queue))
 118                 netdev_warn(padapter->pnetdev, "r8712u: free_recv_skb_queue not empty %d\n",
 119                             skb_queue_len(&precvpriv->free_recv_skb_queue));
 120 }
 121
 122 int r8712_init_recvbuf(struct _adapter *padapter, struct recv_buf *precvbuf)
 123 {
 124         precvbuf->transfer_len = 0;
 125         precvbuf->len = 0;
 126         precvbuf->ref_cnt = 0;
 127         if (precvbuf->pbuf) {
 128                 precvbuf->pdata = precvbuf->pbuf;
 129                 precvbuf->phead = precvbuf->pbuf;
 130                 precvbuf->ptail = precvbuf->pbuf;
 131                 precvbuf->pend = precvbuf->pdata + MAX_RECVBUF_SZ;
 132         }
 133         return _SUCCESS;
 134 }
 135
 136 int r8712_free_recvframe(union recv_frame *precvframe,
 137                    struct  __queue *pfree_recv_queue)
 138 {
 139         unsigned long irqL;
 140         struct _adapter *padapter = precvframe->u.hdr.adapter;
 141         struct recv_priv *precvpriv = &padapter->recvpriv;
 142
 143         if (precvframe->u.hdr.pkt) {
 144                 dev_kfree_skb_any(precvframe->u.hdr.pkt);/*free skb by driver*/
 145                 precvframe->u.hdr.pkt = NULL;
 146         }
 147         spin_lock_irqsave(&pfree_recv_queue->lock, irqL);
 148         list_del_init(&(precvframe->u.hdr.list));
 149         list_add_tail(&(precvframe->u.hdr.list), &pfree_recv_queue->queue);
 150         if (padapter != NULL) {
 151                 if (pfree_recv_queue == &precvpriv->free_recv_queue)
 152                                 precvpriv->free_recvframe_cnt++;
 153         }
 154         spin_unlock_irqrestore(&pfree_recv_queue->lock, irqL);
 155         return _SUCCESS;
 156 }
 157
 158 static void update_recvframe_attrib_from_recvstat(struct rx_pkt_attrib *pattrib,
 159                                            struct recv_stat *prxstat)
 160 {
 161         u16 drvinfo_sz = 0;
 162
 163         drvinfo_sz = (le32_to_cpu(prxstat->rxdw0)&0x000f0000)>>16;
 164         drvinfo_sz <<= 3;
 165         /*TODO:
 166          * Offset 0 */
 167         pattrib->bdecrypted = ((le32_to_cpu(prxstat->rxdw0) & BIT(27)) >> 27)
 168                                  ? 0 : 1;
 169         pattrib->crc_err = (le32_to_cpu(prxstat->rxdw0) & BIT(14)) >> 14;
 170         /*Offset 4*/
 171         /*Offset 8*/
 172         /*Offset 12*/
 173         if (le32_to_cpu(prxstat->rxdw3) & BIT(13)) {
 174                 pattrib->tcpchk_valid = 1; /* valid */
 175                 if (le32_to_cpu(prxstat->rxdw3) & BIT(11))
 176                         pattrib->tcp_chkrpt = 1; /* correct */
 177                 else
 178                         pattrib->tcp_chkrpt = 0; /* incorrect */
 179                 if (le32_to_cpu(prxstat->rxdw3) & BIT(12))
 180                         pattrib->ip_chkrpt = 1; /* correct */
 181                 else
 182                         pattrib->ip_chkrpt = 0; /* incorrect */
 183         } else
 184                 pattrib->tcpchk_valid = 0; /* invalid */
 185         pattrib->mcs_rate = (u8)((le32_to_cpu(prxstat->rxdw3)) & 0x3f);
 186         pattrib->htc = (u8)((le32_to_cpu(prxstat->rxdw3) >> 14) & 0x1);
 187         /*Offset 16*/
 188         /*Offset 20*/
 189         /*phy_info*/
 190 }
 191
 192 /*perform defrag*/
 193 static union recv_frame *recvframe_defrag(struct _adapter *adapter,
 194                                    struct  __queue *defrag_q)
 195 {
 196         struct list_head *plist, *phead;
 197         u8 wlanhdr_offset;
 198         u8      curfragnum;
 199         struct recv_frame_hdr *pfhdr, *pnfhdr;
 200         union recv_frame *prframe, *pnextrframe;
 201         struct  __queue *pfree_recv_queue;
 202
 203         pfree_recv_queue = &adapter->recvpriv.free_recv_queue;
 204         phead = &defrag_q->queue;
 205         plist = phead->next;
 206         prframe = LIST_CONTAINOR(plist, union recv_frame, u);
 207         list_del_init(&prframe->u.list);
 208         pfhdr = &prframe->u.hdr;
 209         curfragnum = 0;
 210         if (curfragnum != pfhdr->attrib.frag_num) {
 211                 /*the first fragment number must be 0
 212                  *free the whole queue*/
 213                 r8712_free_recvframe(prframe, pfree_recv_queue);
 214                 r8712_free_recvframe_queue(defrag_q, pfree_recv_queue);
 215                 return NULL;
 216         }
 217         curfragnum++;
 218         plist = &defrag_q->queue;
 219         plist = plist->next;
 220         while (end_of_queue_search(phead, plist) == false) {
 221                 pnextrframe = LIST_CONTAINOR(plist, union recv_frame, u);
 222                 pnfhdr = &pnextrframe->u.hdr;
 223                 /*check the fragment sequence  (2nd ~n fragment frame) */
 224                 if (curfragnum != pnfhdr->attrib.frag_num) {
 225                         /* the fragment number must increase  (after decache)
 226                          * release the defrag_q & prframe */
 227                         r8712_free_recvframe(prframe, pfree_recv_queue);
 228                         r8712_free_recvframe_queue(defrag_q, pfree_recv_queue);
 229                         return NULL;
 230                 }
 231                 curfragnum++;
 232                 /* copy the 2nd~n fragment frame's payload to the first fragment
 233                  * get the 2nd~last fragment frame's payload */
 234                 wlanhdr_offset = pnfhdr->attrib.hdrlen + pnfhdr->attrib.iv_len;
 235                 recvframe_pull(pnextrframe, wlanhdr_offset);
 236                 /* append  to first fragment frame's tail (if privacy frame,
 237                  * pull the ICV) */
 238                 recvframe_pull_tail(prframe, pfhdr->attrib.icv_len);
 239                 memcpy(pfhdr->rx_tail, pnfhdr->rx_data, pnfhdr->len);
 240                 recvframe_put(prframe, pnfhdr->len);
 241                 pfhdr->attrib.icv_len = pnfhdr->attrib.icv_len;
 242                 plist = plist->next;
 243         }
 244         /* free the defrag_q queue and return the prframe */
 245         r8712_free_recvframe_queue(defrag_q, pfree_recv_queue);
 246         return prframe;
 247 }
 248
 249 /* check if need to defrag, if needed queue the frame to defrag_q */
 250 union recv_frame *r8712_recvframe_chk_defrag(struct _adapter *padapter,
 251                                              union recv_frame *precv_frame)
 252 {
 253         u8      ismfrag;
 254         u8      fragnum;
 255         u8   *psta_addr;
 256         struct recv_frame_hdr *pfhdr;
 257         struct sta_info *psta;
 258         struct  sta_priv *pstapriv;
 259         struct list_head *phead;
 260         union recv_frame *prtnframe = NULL;
 261         struct  __queue *pfree_recv_queue, *pdefrag_q;
 262
 263         pstapriv = &padapter->stapriv;
 264         pfhdr = &precv_frame->u.hdr;
 265         pfree_recv_queue = &padapter->recvpriv.free_recv_queue;
 266         /* need to define struct of wlan header frame ctrl */
 267         ismfrag = pfhdr->attrib.mfrag;
 268         fragnum = pfhdr->attrib.frag_num;
 269         psta_addr = pfhdr->attrib.ta;
 270         psta = r8712_get_stainfo(pstapriv, psta_addr);
 271         if (psta == NULL)
 272                 pdefrag_q = NULL;
 273         else
 274                 pdefrag_q = &psta->sta_recvpriv.defrag_q;
 275
 276         if ((ismfrag == 0) && (fragnum == 0))
 277                 prtnframe = precv_frame;/*isn't a fragment frame*/
 278         if (ismfrag == 1) {
 279                 /* 0~(n-1) fragment frame
 280                  * enqueue to defraf_g */
 281                 if (pdefrag_q != NULL) {
 282                         if (fragnum == 0) {
 283                                 /*the first fragment*/
 284                                 if (!list_empty(&pdefrag_q->queue)) {
 285                                         /*free current defrag_q */
 286                                         r8712_free_recvframe_queue(pdefrag_q,
 287                                                              pfree_recv_queue);
 288                                 }
 289                         }
 290                         /* Then enqueue the 0~(n-1) fragment to the defrag_q */
 291                         phead = &pdefrag_q->queue;
 292                         list_add_tail(&pfhdr->list, phead);
 293                         prtnframe = NULL;
 294                 } else {
 295                         /* can't find this ta's defrag_queue, so free this
 296                          * recv_frame */
 297                         r8712_free_recvframe(precv_frame, pfree_recv_queue);
 298                         prtnframe = NULL;
 299                 }
 300
 301         }
 302         if ((ismfrag == 0) && (fragnum != 0)) {
 303                 /* the last fragment frame
 304                  * enqueue the last fragment */
 305                 if (pdefrag_q != NULL) {
 306                         phead = &pdefrag_q->queue;
 307                         list_add_tail(&pfhdr->list, phead);
 308                         /*call recvframe_defrag to defrag*/
 309                         precv_frame = recvframe_defrag(padapter, pdefrag_q);
 310                         prtnframe = precv_frame;
 311                 } else {
 312                         /* can't find this ta's defrag_queue, so free this
 313                          *  recv_frame */
 314                         r8712_free_recvframe(precv_frame, pfree_recv_queue);
 315                         prtnframe = NULL;
 316                 }
 317         }
 318         if ((prtnframe != NULL) && (prtnframe->u.hdr.attrib.privacy)) {
 319                 /* after defrag we must check tkip mic code */
 320                 if (r8712_recvframe_chkmic(padapter, prtnframe) == _FAIL) {
 321                         r8712_free_recvframe(prtnframe, pfree_recv_queue);
 322                         prtnframe = NULL;
 323                 }
 324         }
 325         return prtnframe;
 326 }
 327
 328 static int amsdu_to_msdu(struct _adapter *padapter, union recv_frame *prframe)
 329 {
 330         int     a_len, padding_len;
 331         u16     eth_type, nSubframe_Length;
 332         u8      nr_subframes, i;
 333         unsigned char *data_ptr, *pdata;
 334         struct rx_pkt_attrib *pattrib;
 335         _pkt *sub_skb, *subframes[MAX_SUBFRAME_COUNT];
 336         struct recv_priv *precvpriv = &padapter->recvpriv;
 337         struct  __queue *pfree_recv_queue = &(precvpriv->free_recv_queue);
 338
 339         nr_subframes = 0;
 340         pattrib = &prframe->u.hdr.attrib;
 341         recvframe_pull(prframe, prframe->u.hdr.attrib.hdrlen);
 342         if (prframe->u.hdr.attrib.iv_len > 0)
 343                 recvframe_pull(prframe, prframe->u.hdr.attrib.iv_len);
 344         a_len = prframe->u.hdr.len;
 345         pdata = prframe->u.hdr.rx_data;
 346         while (a_len > ETH_HLEN) {
 347                 /* Offset 12 denote 2 mac address */
 348                 nSubframe_Length = *((u16 *)(pdata + 12));
 349                 /*==m==>change the length order*/
 350                 nSubframe_Length = (nSubframe_Length >> 8) +
 351                                    (nSubframe_Length << 8);
 352                 if (a_len < (ETHERNET_HEADER_SIZE + nSubframe_Length)) {
 353                         netdev_warn(padapter->pnetdev, "r8712u: nRemain_Length is %d and nSubframe_Length is: %d\n",
 354                                     a_len, nSubframe_Length);
 355                         goto exit;
 356                 }
 357                 /* move the data point to data content */
 358                 pdata += ETH_HLEN;
 359                 a_len -= ETH_HLEN;
 360                 /* Allocate new skb for releasing to upper layer */
 361                 sub_skb = dev_alloc_skb(nSubframe_Length + 12);
 362                 if (!sub_skb)
 363                         break;
 364                 skb_reserve(sub_skb, 12);
 365                 data_ptr = (u8 *)skb_put(sub_skb, nSubframe_Length);
 366                 memcpy(data_ptr, pdata, nSubframe_Length);
 367                 subframes[nr_subframes++] = sub_skb;
 368                 if (nr_subframes >= MAX_SUBFRAME_COUNT) {
 369                         netdev_warn(padapter->pnetdev, "r8712u: ParseSubframe(): Too many Subframes! Packets dropped!\n");
 370                         break;
 371                 }
 372                 pdata += nSubframe_Length;
 373                 a_len -= nSubframe_Length;
 374                 if (a_len != 0) {
 375                         padding_len = 4 - ((nSubframe_Length + ETH_HLEN) & 3);
 376                         if (padding_len == 4)
 377                                 padding_len = 0;
 378                         if (a_len < padding_len)
 379                                 goto exit;
 380                         pdata += padding_len;
 381                         a_len -= padding_len;
 382                 }
 383         }
 384         for (i = 0; i < nr_subframes; i++) {
 385                 sub_skb = subframes[i];
 386                 /* convert hdr + possible LLC headers into Ethernet header */
 387                 eth_type = (sub_skb->data[6] << 8) | sub_skb->data[7];
 388                 if (sub_skb->len >= 8 &&
 389                    ((!memcmp(sub_skb->data, rfc1042_header, SNAP_SIZE) &&
 390                    eth_type != ETH_P_AARP && eth_type != ETH_P_IPX) ||
 391                    !memcmp(sub_skb->data, bridge_tunnel_header, SNAP_SIZE))) {
 392                         /* remove RFC1042 or Bridge-Tunnel encapsulation and
 393                          * replace EtherType */
 394                         skb_pull(sub_skb, SNAP_SIZE);
 395                         memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->src,
 396                                 ETH_ALEN);
 397                         memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->dst,
 398                                 ETH_ALEN);
 399                 } else {
 400                         u16 len;
 401                         /* Leave Ethernet header part of hdr and full payload */
 402                         len = htons(sub_skb->len);
 403                         memcpy(skb_push(sub_skb, 2), &len, 2);
 404                         memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->src,
 405                                 ETH_ALEN);
 406                         memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->dst,
 407                                 ETH_ALEN);
 408                 }
 409                 /* Indicate the packets to upper layer */
 410                 if (sub_skb) {
 411                         sub_skb->protocol =
 412                                  eth_type_trans(sub_skb, padapter->pnetdev);
 413                         sub_skb->dev = padapter->pnetdev;
 414                         if ((pattrib->tcpchk_valid == 1) &&
 415                             (pattrib->tcp_chkrpt == 1)) {
 416                                 sub_skb->ip_summed = CHECKSUM_UNNECESSARY;
 417                         } else
 418                                 sub_skb->ip_summed = CHECKSUM_NONE;
 419                         netif_rx(sub_skb);
 420                 }
 421         }
 422 exit:
 423         prframe->u.hdr.len = 0;
 424         r8712_free_recvframe(prframe, pfree_recv_queue);
 425         return _SUCCESS;
 426 }
 427
 428 void r8712_rxcmd_event_hdl(struct _adapter *padapter, void *prxcmdbuf)
 429 {
 430         uint voffset;
 431         u8 *poffset;
 432         u16 cmd_len, drvinfo_sz;
 433         struct recv_stat *prxstat;
 434
 435         poffset = (u8 *)prxcmdbuf;
 436         voffset = *(uint *)poffset;
 437         prxstat = (struct recv_stat *)prxcmdbuf;
 438         drvinfo_sz = (le32_to_cpu(prxstat->rxdw0) & 0x000f0000) >> 16;
 439         drvinfo_sz <<= 3;
 440         poffset += RXDESC_SIZE + drvinfo_sz;
 441         do {
 442                 voffset  = *(uint *)poffset;
 443                 cmd_len = (u16)(le32_to_cpu(voffset) & 0xffff);
 444                 r8712_event_handle(padapter, (uint *)poffset);
 445                 poffset += (cmd_len + 8);/*8 bytes alignment*/
 446         } while (le32_to_cpu(voffset) & BIT(31));
 447
 448 }
 449
 450 static int check_indicate_seq(struct recv_reorder_ctrl *preorder_ctrl,
 451                               u16 seq_num)
 452 {
 453         u8 wsize = preorder_ctrl->wsize_b;
 454         u16 wend = (preorder_ctrl->indicate_seq + wsize - 1) % 4096;
 455
 456         /* Rx Reorder initialize condition.*/
 457         if (preorder_ctrl->indicate_seq == 0xffff)
 458                 preorder_ctrl->indicate_seq = seq_num;
 459         /* Drop out the packet which SeqNum is smaller than WinStart */
 460         if (SN_LESS(seq_num, preorder_ctrl->indicate_seq))
 461                 return false;
 462         /*
 463          * Sliding window manipulation. Conditions includes:
 464          * 1. Incoming SeqNum is equal to WinStart =>Window shift 1
 465          * 2. Incoming SeqNum is larger than the WinEnd => Window shift N
 466          */
 467         if (SN_EQUAL(seq_num, preorder_ctrl->indicate_seq))
 468                 preorder_ctrl->indicate_seq = (preorder_ctrl->indicate_seq +
 469                                               1) % 4096;
 470         else if (SN_LESS(wend, seq_num)) {
 471                 if (seq_num >= (wsize - 1))
 472                         preorder_ctrl->indicate_seq = seq_num + 1 - wsize;
 473                 else
 474                         preorder_ctrl->indicate_seq = 4095 - (wsize -
 475                                                       (seq_num + 1)) + 1;
 476         }
 477         return true;
 478 }
 479
 480 static int enqueue_reorder_recvframe(struct recv_reorder_ctrl *preorder_ctrl,
 481                               union recv_frame *prframe)
 482 {
 483         struct list_head *phead, *plist;
 484         union recv_frame *pnextrframe;
 485         struct rx_pkt_attrib *pnextattrib;
 486         struct  __queue *ppending_recvframe_queue =
 487                                         &preorder_ctrl->pending_recvframe_queue;
 488         struct rx_pkt_attrib *pattrib = &prframe->u.hdr.attrib;
 489
 490         phead = &ppending_recvframe_queue->queue;
 491         plist = phead->next;
 492         while (end_of_queue_search(phead, plist) == false) {
 493                 pnextrframe = LIST_CONTAINOR(plist, union recv_frame, u);
 494                 pnextattrib = &pnextrframe->u.hdr.attrib;
 495                 if (SN_LESS(pnextattrib->seq_num, pattrib->seq_num))
 496                         plist = plist->next;
 497                 else if (SN_EQUAL(pnextattrib->seq_num, pattrib->seq_num))
 498                         return false;
 499                 else
 500                         break;
 501         }
 502         list_del_init(&(prframe->u.hdr.list));
 503         list_add_tail(&(prframe->u.hdr.list), plist);
 504         return true;
 505 }
 506
 507 int r8712_recv_indicatepkts_in_order(struct _adapter *padapter,
 508                                struct recv_reorder_ctrl *preorder_ctrl,
 509                                int bforced)
 510 {
 511         struct list_head *phead, *plist;
 512         union recv_frame *prframe;
 513         struct rx_pkt_attrib *pattrib;
 514         int bPktInBuf = false;
 515         struct recv_priv *precvpriv = &padapter->recvpriv;
 516         struct  __queue *ppending_recvframe_queue =
 517                          &preorder_ctrl->pending_recvframe_queue;
 518
 519         phead = &ppending_recvframe_queue->queue;
 520         plist = phead->next;
 521         /* Handling some condition for forced indicate case.*/
 522         if (bforced == true) {
 523                 if (list_empty(phead))
 524                         return true;
 525
 526                 prframe = LIST_CONTAINOR(plist, union recv_frame, u);
 527                 pattrib = &prframe->u.hdr.attrib;
 528                 preorder_ctrl->indicate_seq = pattrib->seq_num;
 529         }
 530         /* Prepare indication list and indication.
 531          * Check if there is any packet need indicate. */
 532         while (!list_empty(phead)) {
 533                 prframe = LIST_CONTAINOR(plist, union recv_frame, u);
 534                 pattrib = &prframe->u.hdr.attrib;
 535                 if (!SN_LESS(preorder_ctrl->indicate_seq, pattrib->seq_num)) {
 536                         plist = plist->next;
 537                         list_del_init(&(prframe->u.hdr.list));
 538                         if (SN_EQUAL(preorder_ctrl->indicate_seq,
 539                             pattrib->seq_num))
 540                                 preorder_ctrl->indicate_seq =
 541                                   (preorder_ctrl->indicate_seq + 1) % 4096;
 542                         /*indicate this recv_frame*/
 543                         if (!pattrib->amsdu) {
 544                                 if ((padapter->bDriverStopped == false) &&
 545                                     (padapter->bSurpriseRemoved == false)) {
 546                                         /* indicate this recv_frame */
 547                                         r8712_recv_indicatepkt(padapter,
 548                                                                prframe);
 549                                 }
 550                         } else if (pattrib->amsdu == 1) {
 551                                 if (amsdu_to_msdu(padapter, prframe) !=
 552                                     _SUCCESS)
 553                                         r8712_free_recvframe(prframe,
 554                                                    &precvpriv->free_recv_queue);
 555                         }
 556                         /* Update local variables. */
 557                         bPktInBuf = false;
 558                 } else {
 559                         bPktInBuf = true;
 560                         break;
 561                 }
 562         }
 563         return bPktInBuf;
 564 }
 565
 566 static int recv_indicatepkt_reorder(struct _adapter *padapter,
 567                              union recv_frame *prframe)
 568 {
 569         unsigned long irql;
 570         struct rx_pkt_attrib *pattrib = &prframe->u.hdr.attrib;
 571         struct recv_reorder_ctrl *preorder_ctrl = prframe->u.hdr.preorder_ctrl;
 572         struct  __queue *ppending_recvframe_queue =
 573                          &preorder_ctrl->pending_recvframe_queue;
 574
 575         if (!pattrib->amsdu) {
 576                 /* s1. */
 577                 r8712_wlanhdr_to_ethhdr(prframe);
 578                 if (pattrib->qos != 1) {
 579                         if ((padapter->bDriverStopped == false) &&
 580                            (padapter->bSurpriseRemoved == false)) {
 581                                 r8712_recv_indicatepkt(padapter, prframe);
 582                                 return _SUCCESS;
 583                         } else
 584                                 return _FAIL;
 585                 }
 586         }
 587         spin_lock_irqsave(&ppending_recvframe_queue->lock, irql);
 588         /*s2. check if winstart_b(indicate_seq) needs to be updated*/
 589         if (!check_indicate_seq(preorder_ctrl, pattrib->seq_num))
 590                 goto _err_exit;
 591         /*s3. Insert all packet into Reorder Queue to maintain its ordering.*/
 592         if (!enqueue_reorder_recvframe(preorder_ctrl, prframe))
 593                 goto _err_exit;
 594         /*s4.
 595          * Indication process.
 596          * After Packet dropping and Sliding Window shifting as above, we can
 597          * now just indicate the packets with the SeqNum smaller than latest
 598          * WinStart and buffer other packets.
 599          *
 600          * For Rx Reorder condition:
 601          * 1. All packets with SeqNum smaller than WinStart => Indicate
 602          * 2. All packets with SeqNum larger than or equal to
 603          * WinStart => Buffer it.
 604          */
 605         if (r8712_recv_indicatepkts_in_order(padapter, preorder_ctrl, false) ==
 606             true) {
 607                 mod_timer(&preorder_ctrl->reordering_ctrl_timer,
 608                           jiffies + msecs_to_jiffies(REORDER_WAIT_TIME));
 609                 spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
 610         } else {
 611                 spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
 612                 del_timer(&preorder_ctrl->reordering_ctrl_timer);
 613         }
 614         return _SUCCESS;
 615 _err_exit:
 616         spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
 617         return _FAIL;
 618 }
 619
 620 void r8712_reordering_ctrl_timeout_handler(void *pcontext)
 621 {
 622         unsigned long irql;
 623         struct recv_reorder_ctrl *preorder_ctrl =
 624                                  (struct recv_reorder_ctrl *)pcontext;
 625         struct _adapter *padapter = preorder_ctrl->padapter;
 626         struct  __queue *ppending_recvframe_queue =
 627                                  &preorder_ctrl->pending_recvframe_queue;
 628
 629         if (padapter->bDriverStopped || padapter->bSurpriseRemoved)
 630                 return;
 631         spin_lock_irqsave(&ppending_recvframe_queue->lock, irql);
 632         r8712_recv_indicatepkts_in_order(padapter, preorder_ctrl, true);
 633         spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
 634 }
 635
 636 static int r8712_process_recv_indicatepkts(struct _adapter *padapter,
 637                               union recv_frame *prframe)
 638 {
 639         int retval = _SUCCESS;
 640         struct mlme_priv *pmlmepriv = &padapter->mlmepriv;
 641         struct ht_priv  *phtpriv = &pmlmepriv->htpriv;
 642
 643         if (phtpriv->ht_option == 1) { /*B/G/N Mode*/
 644                 if (recv_indicatepkt_reorder(padapter, prframe) != _SUCCESS) {
 645                         /* including perform A-MPDU Rx Ordering Buffer Control*/
 646                         if ((padapter->bDriverStopped == false) &&
 647                             (padapter->bSurpriseRemoved == false))
 648                                 return _FAIL;
 649                 }
 650         } else { /*B/G mode*/
 651                 retval = r8712_wlanhdr_to_ethhdr(prframe);
 652                 if (retval != _SUCCESS)
 653                         return retval;
 654                 if ((padapter->bDriverStopped == false) &&
 655                     (padapter->bSurpriseRemoved == false)) {
 656                         /* indicate this recv_frame */
 657                         r8712_recv_indicatepkt(padapter, prframe);
 658                 } else
 659                         return _FAIL;
 660         }
 661         return retval;
 662 }
 663
 664 static u8 query_rx_pwr_percentage(s8 antpower)
 665 {
 666         if ((antpower <= -100) || (antpower >= 20))
 667                 return  0;
 668         else if (antpower >= 0)
 669                 return  100;
 670         else
 671                 return 100 + antpower;
 672 }
 673
 674 static u8 evm_db2percentage(s8 value)
 675 {
 676         /*
 677          * -33dB~0dB to 0%~99%
 678          */
 679         s8 ret_val;
 680
 681         ret_val = value;
 682         if (ret_val >= 0)
 683                 ret_val = 0;
 684         if (ret_val <= -33)
 685                 ret_val = -33;
 686         ret_val = -ret_val;
 687         ret_val *= 3;
 688         if (ret_val == 99)
 689                 ret_val = 100;
 690         return ret_val;
 691 }
 692
 693 s32 r8712_signal_scale_mapping(s32 cur_sig)
 694 {
 695         s32 ret_sig;
 696
 697         if (cur_sig >= 51 && cur_sig <= 100)
 698                 ret_sig = 100;
 699         else if (cur_sig >= 41 && cur_sig <= 50)
 700                 ret_sig = 80 + ((cur_sig - 40) * 2);
 701         else if (cur_sig >= 31 && cur_sig <= 40)
 702                 ret_sig = 66 + (cur_sig - 30);
 703         else if (cur_sig >= 21 && cur_sig <= 30)
 704                 ret_sig = 54 + (cur_sig - 20);
 705         else if (cur_sig >= 10 && cur_sig <= 20)
 706                 ret_sig = 42 + (((cur_sig - 10) * 2) / 3);
 707         else if (cur_sig >= 5 && cur_sig <= 9)
 708                 ret_sig = 22 + (((cur_sig - 5) * 3) / 2);
 709         else if (cur_sig >= 1 && cur_sig <= 4)
 710                 ret_sig = 6 + (((cur_sig - 1) * 3) / 2);
 711         else
 712                 ret_sig = cur_sig;
 713         return ret_sig;
 714 }
 715
 716 static s32  translate2dbm(struct _adapter *padapter, u8 signal_strength_idx)
 717 {
 718         s32 signal_power; /* in dBm.*/
 719         /* Translate to dBm (x=0.5y-95).*/
 720         signal_power = (s32)((signal_strength_idx + 1) >> 1);
 721         signal_power -= 95;
 722         return signal_power;
 723 }
 724
 725 static void query_rx_phy_status(struct _adapter *padapter,
 726                                 union recv_frame *prframe)
 727 {
 728         u8 i, max_spatial_stream, evm;
 729         struct recv_stat *prxstat = (struct recv_stat *)prframe->u.hdr.rx_head;
 730         struct phy_stat *pphy_stat = (struct phy_stat *)(prxstat + 1);
 731         u8 *pphy_head = (u8 *)(prxstat + 1);
 732         s8 rx_pwr[4], rx_pwr_all;
 733         u8 pwdb_all;
 734         u32 rssi, total_rssi = 0;
 735         u8 bcck_rate = 0, rf_rx_num = 0, cck_highpwr = 0;
 736         struct phy_cck_rx_status *pcck_buf;
 737         u8 sq;
 738
 739         /* Record it for next packet processing*/
 740         bcck_rate = (prframe->u.hdr.attrib.mcs_rate <= 3 ? 1 : 0);
 741         if (bcck_rate) {
 742                 u8 report;
 743
 744                 /* CCK Driver info Structure is not the same as OFDM packet.*/
 745                 pcck_buf = (struct phy_cck_rx_status *)pphy_stat;
 746                 /* (1)Hardware does not provide RSSI for CCK
 747                  * (2)PWDB, Average PWDB cacluated by hardware
 748                  * (for rate adaptive)
 749                  */
 750                 if (!cck_highpwr) {
 751                         report = pcck_buf->cck_agc_rpt & 0xc0;
 752                         report >>= 6;
 753                         switch (report) {
 754                         /* Modify the RF RNA gain value to -40, -20,
 755                          * -2, 14 by Jenyu's suggestion
 756                          * Note: different RF with the different
 757                          * RNA gain. */
 758                         case 0x3:
 759                                 rx_pwr_all = -40 - (pcck_buf->cck_agc_rpt &
 760                                              0x3e);
 761                                 break;
 762                         case 0x2:
 763                                 rx_pwr_all = -20 - (pcck_buf->cck_agc_rpt &
 764                                              0x3e);
 765                                 break;
 766                         case 0x1:
 767                                 rx_pwr_all = -2 - (pcck_buf->cck_agc_rpt &
 768                                              0x3e);
 769                                 break;
 770                         case 0x0:
 771                                 rx_pwr_all = 14 - (pcck_buf->cck_agc_rpt &
 772                                              0x3e);
 773                                 break;
 774                         }
 775                 } else {
 776                         report = ((u8)(le32_to_cpu(pphy_stat->phydw1) >> 8)) &
 777                                  0x60;
 778                         report >>= 5;
 779                         switch (report) {
 780                         case 0x3:
 781                                 rx_pwr_all = -40 - ((pcck_buf->cck_agc_rpt &
 782                                              0x1f) << 1);
 783                                 break;
 784                         case 0x2:
 785                                 rx_pwr_all = -20 - ((pcck_buf->cck_agc_rpt &
 786                                              0x1f) << 1);
 787                                 break;
 788                         case 0x1:
 789                                 rx_pwr_all = -2 - ((pcck_buf->cck_agc_rpt &
 790                                              0x1f) << 1);
 791                                 break;
 792                         case 0x0:
 793                                 rx_pwr_all = 14 - ((pcck_buf->cck_agc_rpt &
 794                                              0x1f) << 1);
 795                                 break;
 796                         }
 797                 }
 798                 pwdb_all = query_rx_pwr_percentage(rx_pwr_all);
 799                 /* CCK gain is smaller than OFDM/MCS gain,*/
 800                 /* so we add gain diff by experiences, the val is 6 */
 801                 pwdb_all += 6;
 802                 if (pwdb_all > 100)
 803                         pwdb_all = 100;
 804                 /* modify the offset to make the same gain index with OFDM.*/
 805                 if (pwdb_all > 34 && pwdb_all <= 42)
 806                         pwdb_all -= 2;
 807                 else if (pwdb_all > 26 && pwdb_all <= 34)
 808                         pwdb_all -= 6;
 809                 else if (pwdb_all > 14 && pwdb_all <= 26)
 810                         pwdb_all -= 8;
 811                 else if (pwdb_all > 4 && pwdb_all <= 14)
 812                         pwdb_all -= 4;
 813                 /*
 814                  * (3) Get Signal Quality (EVM)
 815                  */
 816                 if (pwdb_all > 40)
 817                         sq = 100;
 818                 else {
 819                         sq = pcck_buf->sq_rpt;
 820                         if (pcck_buf->sq_rpt > 64)
 821                                 sq = 0;
 822                         else if (pcck_buf->sq_rpt < 20)
 823                                 sq = 100;
 824                         else
 825                                 sq = ((64-sq) * 100) / 44;
 826                 }
 827                 prframe->u.hdr.attrib.signal_qual = sq;
 828                 prframe->u.hdr.attrib.rx_mimo_signal_qual[0] = sq;
 829                 prframe->u.hdr.attrib.rx_mimo_signal_qual[1] = -1;
 830         } else {
 831                 /* (1)Get RSSI for HT rate */
 832                 for (i = 0; i < ((padapter->registrypriv.rf_config) &
 833                             0x0f); i++) {
 834                         rf_rx_num++;
 835                         rx_pwr[i] = ((pphy_head[PHY_STAT_GAIN_TRSW_SHT + i]
 836                                     & 0x3F) * 2) - 110;
 837                         /* Translate DBM to percentage. */
 838                         rssi = query_rx_pwr_percentage(rx_pwr[i]);
 839                         total_rssi += rssi;
 840                 }
 841                 /* (2)PWDB, Average PWDB cacluated by hardware (for
 842                  * rate adaptive) */
 843                 rx_pwr_all = (((pphy_head[PHY_STAT_PWDB_ALL_SHT]) >> 1) & 0x7f)
 844                              - 106;
 845                 pwdb_all = query_rx_pwr_percentage(rx_pwr_all);
 846
 847                 {
 848                         /* (3)EVM of HT rate */
 849                         if (prframe->u.hdr.attrib.htc &&
 850                             prframe->u.hdr.attrib.mcs_rate >= 20 &&
 851                             prframe->u.hdr.attrib.mcs_rate <= 27) {
 852                                 /* both spatial stream make sense */
 853                                 max_spatial_stream = 2;
 854                         } else {
 855                                 /* only spatial stream 1 makes sense */
 856                                 max_spatial_stream = 1;
 857                         }
 858                         for (i = 0; i < max_spatial_stream; i++) {
 859                                 evm = evm_db2percentage((pphy_head
 860                                       [PHY_STAT_RXEVM_SHT + i]));/*dbm*/
 861                                 prframe->u.hdr.attrib.signal_qual =
 862                                          (u8)(evm & 0xff);
 863                                 prframe->u.hdr.attrib.rx_mimo_signal_qual[i] =
 864                                          (u8)(evm & 0xff);
 865                         }
 866                 }
 867         }
 868         /* UI BSS List signal strength(in percentage), make it good looking,
 869          * from 0~100. It is assigned to the BSS List in
 870          * GetValueFromBeaconOrProbeRsp(). */
 871         if (bcck_rate)
 872                 prframe->u.hdr.attrib.signal_strength =
 873                          (u8)r8712_signal_scale_mapping(pwdb_all);
 874         else {
 875                 if (rf_rx_num != 0)
 876                         prframe->u.hdr.attrib.signal_strength =
 877                                  (u8)(r8712_signal_scale_mapping(total_rssi /=
 878                                  rf_rx_num));
 879         }
 880 }
 881
 882 static void process_link_qual(struct _adapter *padapter,
 883                               union recv_frame *prframe)
 884 {
 885         u32     last_evm = 0, tmpVal;
 886         struct rx_pkt_attrib *pattrib;
 887
 888         if (prframe == NULL || padapter == NULL)
 889                 return;
 890         pattrib = &prframe->u.hdr.attrib;
 891         if (pattrib->signal_qual != 0) {
 892                 /*
 893                  * 1. Record the general EVM to the sliding window.
 894                  */
 895                 if (padapter->recvpriv.signal_qual_data.total_num++ >=
 896                                   PHY_LINKQUALITY_SLID_WIN_MAX) {
 897                         padapter->recvpriv.signal_qual_data.total_num =
 898                                   PHY_LINKQUALITY_SLID_WIN_MAX;
 899                         last_evm = padapter->recvpriv.signal_qual_data.elements
 900                                   [padapter->recvpriv.signal_qual_data.index];
 901                         padapter->recvpriv.signal_qual_data.total_val -=
 902                                   last_evm;
 903                 }
 904                 padapter->recvpriv.signal_qual_data.total_val +=
 905                           pattrib->signal_qual;
 906                 padapter->recvpriv.signal_qual_data.elements[padapter->
 907                           recvpriv.signal_qual_data.index++] =
 908                           pattrib->signal_qual;
 909                 if (padapter->recvpriv.signal_qual_data.index >=
 910                     PHY_LINKQUALITY_SLID_WIN_MAX)
 911                         padapter->recvpriv.signal_qual_data.index = 0;
 912
 913                 /* <1> Showed on UI for user, in percentage. */
 914                 tmpVal = padapter->recvpriv.signal_qual_data.total_val /
 915                          padapter->recvpriv.signal_qual_data.total_num;
 916                 padapter->recvpriv.signal = (u8)tmpVal;
 917         }
 918 }
 919
 920 static void process_rssi(struct _adapter *padapter, union recv_frame *prframe)
 921 {
 922         u32 last_rssi, tmp_val;
 923         struct rx_pkt_attrib *pattrib = &prframe->u.hdr.attrib;
 924
 925         if (padapter->recvpriv.signal_strength_data.total_num++ >=
 926             PHY_RSSI_SLID_WIN_MAX) {
 927                 padapter->recvpriv.signal_strength_data.total_num =
 928                          PHY_RSSI_SLID_WIN_MAX;
 929                 last_rssi = padapter->recvpriv.signal_strength_data.elements
 930                             [padapter->recvpriv.signal_strength_data.index];
 931                 padapter->recvpriv.signal_strength_data.total_val -= last_rssi;
 932         }
 933         padapter->recvpriv.signal_strength_data.total_val +=
 934                         pattrib->signal_strength;
 935         padapter->recvpriv.signal_strength_data.elements[padapter->recvpriv.
 936                         signal_strength_data.index++] =
 937                         pattrib->signal_strength;
 938         if (padapter->recvpriv.signal_strength_data.index >=
 939             PHY_RSSI_SLID_WIN_MAX)
 940                 padapter->recvpriv.signal_strength_data.index = 0;
 941         tmp_val = padapter->recvpriv.signal_strength_data.total_val /
 942                   padapter->recvpriv.signal_strength_data.total_num;
 943         padapter->recvpriv.rssi = (s8)translate2dbm(padapter, (u8)tmp_val);
 944 }
 945
 946 static void process_phy_info(struct _adapter *padapter,
 947                              union recv_frame *prframe)
 948 {
 949         query_rx_phy_status(padapter, prframe);
 950         process_rssi(padapter, prframe);
 951         process_link_qual(padapter,  prframe);
 952 }
 953
 954 int recv_func(struct _adapter *padapter, void *pcontext)
 955 {
 956         struct rx_pkt_attrib *pattrib;
 957         union recv_frame *prframe, *orig_prframe;
 958         int retval = _SUCCESS;
 959         struct  __queue *pfree_recv_queue = &padapter->recvpriv.free_recv_queue;
 960         struct  mlme_priv       *pmlmepriv = &padapter->mlmepriv;
 961
 962         prframe = (union recv_frame *)pcontext;
 963         orig_prframe = prframe;
 964         pattrib = &prframe->u.hdr.attrib;
 965         if (check_fwstate(pmlmepriv, WIFI_MP_STATE) == true) {
 966                 if (pattrib->crc_err == 1)
 967                         padapter->mppriv.rx_crcerrpktcount++;
 968                 else
 969                         padapter->mppriv.rx_pktcount++;
 970                 if (check_fwstate(pmlmepriv, WIFI_MP_LPBK_STATE) == false) {
 971                         /* free this recv_frame */
 972                         r8712_free_recvframe(orig_prframe, pfree_recv_queue);
 973                         goto _exit_recv_func;
 974                 }
 975         }
 976         /* check the frame crtl field and decache */
 977         retval = r8712_validate_recv_frame(padapter, prframe);
 978         if (retval != _SUCCESS) {
 979                 /* free this recv_frame */
 980                 r8712_free_recvframe(orig_prframe, pfree_recv_queue);
 981                 goto _exit_recv_func;
 982         }
 983         process_phy_info(padapter, prframe);
 984         prframe = r8712_decryptor(padapter, prframe);
 985         if (prframe == NULL) {
 986                 retval = _FAIL;
 987                 goto _exit_recv_func;
 988         }
 989         prframe = r8712_recvframe_chk_defrag(padapter, prframe);
 990         if (prframe == NULL)
 991                 goto _exit_recv_func;
 992         prframe = r8712_portctrl(padapter, prframe);
 993         if (prframe == NULL) {
 994                 retval = _FAIL;
 995                 goto _exit_recv_func;
 996         }
 997         retval = r8712_process_recv_indicatepkts(padapter, prframe);
 998         if (retval != _SUCCESS) {
 999                 r8712_free_recvframe(orig_prframe, pfree_recv_queue);
1000                 goto _exit_recv_func;
1001         }
1002 _exit_recv_func:
1003         return retval;
1004 }
1005
1006 static int recvbuf2recvframe(struct _adapter *padapter, struct sk_buff *pskb)
1007 {
1008         u8 *pbuf, shift_sz = 0;
1009         u8      frag, mf;
1010         uint    pkt_len;
1011         u32 transfer_len;
1012         struct recv_stat *prxstat;
1013         u16     pkt_cnt, drvinfo_sz, pkt_offset, tmp_len, alloc_sz;
1014         struct  __queue *pfree_recv_queue;
1015         _pkt  *pkt_copy = NULL;
1016         union recv_frame *precvframe = NULL;
1017         struct recv_priv *precvpriv = &padapter->recvpriv;
1018
1019         pfree_recv_queue = &(precvpriv->free_recv_queue);
1020         pbuf = pskb->data;
1021         prxstat = (struct recv_stat *)pbuf;
1022         pkt_cnt = (le32_to_cpu(prxstat->rxdw2)>>16)&0xff;
1023         pkt_len =  le32_to_cpu(prxstat->rxdw0)&0x00003fff;
1024         transfer_len = pskb->len;
1025         /* Test throughput with Netgear 3700 (No security) with Chariot 3T3R
1026          * pairs. The packet count will be a big number so that the containing
1027          * packet will effect the Rx reordering. */
1028         if (transfer_len < pkt_len) {
1029                 /* In this case, it means the MAX_RECVBUF_SZ is too small to
1030                  * get the data from 8712u. */
1031                 return _FAIL;
1032         }
1033         do {
1034                 prxstat = (struct recv_stat *)pbuf;
1035                 pkt_len =  le32_to_cpu(prxstat->rxdw0)&0x00003fff;
1036                 /* more fragment bit */
1037                 mf = (le32_to_cpu(prxstat->rxdw1) >> 27) & 0x1;
1038                 /* ragmentation number */
1039                 frag = (le32_to_cpu(prxstat->rxdw2) >> 12) & 0xf;
1040                 /* uint 2^3 = 8 bytes */
1041                 drvinfo_sz = (le32_to_cpu(prxstat->rxdw0) & 0x000f0000) >> 16;
1042                 drvinfo_sz <<= 3;
1043                 if (pkt_len <= 0)
1044                         goto  _exit_recvbuf2recvframe;
1045                 /* Qos data, wireless lan header length is 26 */
1046                 if ((le32_to_cpu(prxstat->rxdw0) >> 23) & 0x01)
1047                         shift_sz = 2;
1048                 precvframe = r8712_alloc_recvframe(pfree_recv_queue);
1049                 if (precvframe == NULL)
1050                         goto  _exit_recvbuf2recvframe;
1051                 INIT_LIST_HEAD(&precvframe->u.hdr.list);
1052                 precvframe->u.hdr.precvbuf = NULL; /*can't access the precvbuf*/
1053                 precvframe->u.hdr.len = 0;
1054                 tmp_len = pkt_len + drvinfo_sz + RXDESC_SIZE;
1055                 pkt_offset = (u16)round_up(tmp_len, 128);
1056                 /* for first fragment packet, driver need allocate 1536 +
1057                  * drvinfo_sz + RXDESC_SIZE to defrag packet. */
1058                 if ((mf == 1) && (frag == 0))
1059                         alloc_sz = 1658;/*1658+6=1664, 1664 is 128 alignment.*/
1060                 else
1061                         alloc_sz = tmp_len;
1062                 /* 2 is for IP header 4 bytes alignment in QoS packet case.
1063                  * 4 is for skb->data 4 bytes alignment. */
1064                 alloc_sz += 6;
1065                 pkt_copy = netdev_alloc_skb(padapter->pnetdev, alloc_sz);
1066                 if (pkt_copy) {
1067                         precvframe->u.hdr.pkt = pkt_copy;
1068                         skb_reserve(pkt_copy, 4 - ((addr_t)(pkt_copy->data)
1069                                     % 4));
1070                         skb_reserve(pkt_copy, shift_sz);
1071                         memcpy(pkt_copy->data, pbuf, tmp_len);
1072                         precvframe->u.hdr.rx_head = precvframe->u.hdr.rx_data =
1073                                  precvframe->u.hdr.rx_tail = pkt_copy->data;
1074                         precvframe->u.hdr.rx_end = pkt_copy->data + alloc_sz;
1075                 } else {
1076                         precvframe->u.hdr.pkt = skb_clone(pskb, GFP_ATOMIC);
1077                         if (!precvframe->u.hdr.pkt)
1078                                 return _FAIL;
1079                         precvframe->u.hdr.rx_head = pbuf;
1080                         precvframe->u.hdr.rx_data = pbuf;
1081                         precvframe->u.hdr.rx_tail = pbuf;
1082                         precvframe->u.hdr.rx_end = pbuf + alloc_sz;
1083                 }
1084                 recvframe_put(precvframe, tmp_len);
1085                 recvframe_pull(precvframe, drvinfo_sz + RXDESC_SIZE);
1086                 /* because the endian issue, driver avoid reference to the
1087                  * rxstat after calling update_recvframe_attrib_from_recvstat();
1088                  */
1089                 update_recvframe_attrib_from_recvstat(&precvframe->u.hdr.attrib,
1090                                                       prxstat);
1091                 r8712_recv_entry(precvframe);
1092                 transfer_len -= pkt_offset;
1093                 pbuf += pkt_offset;
1094                 pkt_cnt--;
1095                 precvframe = NULL;
1096                 pkt_copy = NULL;
1097         } while ((transfer_len > 0) && pkt_cnt > 0);
1098 _exit_recvbuf2recvframe:
1099         return _SUCCESS;
1100 }
1101
1102 static void recv_tasklet(void *priv)
1103 {
1104         struct sk_buff *pskb;
1105         struct _adapter *padapter = (struct _adapter *)priv;
1106         struct recv_priv *precvpriv = &padapter->recvpriv;
1107
1108         while (NULL != (pskb = skb_dequeue(&precvpriv->rx_skb_queue))) {
1109                 recvbuf2recvframe(padapter, pskb);
1110                 skb_reset_tail_pointer(pskb);
1111                 pskb->len = 0;
1112                 if (!skb_cloned(pskb))
1113                         skb_queue_tail(&precvpriv->free_recv_skb_queue, pskb);
1114                 else
1115                         consume_skb(pskb);
1116         }
1117 }