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 <[email protected]>
  25  * Larry Finger <[email protected]>
  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 = _malloc(NR_RECVBUFF *
  62                                          sizeof(struct recv_buf) + 4);
  63         if (precvpriv->pallocated_recv_buf == NULL)
  64                 return _FAIL;
  65         memset(precvpriv->pallocated_recv_buf, 0, NR_RECVBUFF *
  66                 sizeof(struct recv_buf) + 4);
  67         precvpriv->precv_buf = precvpriv->pallocated_recv_buf + 4 -
  68                               ((addr_t) (precvpriv->pallocated_recv_buf) & 3);
  69         precvbuf = (struct recv_buf *)precvpriv->precv_buf;
  70         for (i = 0; i < NR_RECVBUFF; i++) {
  71                 _init_listhead(&precvbuf->list);
  72                 spin_lock_init(&precvbuf->recvbuf_lock);
  73                 res = r8712_os_recvbuf_resource_alloc(padapter, precvbuf);
  74                 if (res == _FAIL)
  75                         break;
  76                 precvbuf->ref_cnt = 0;
  77                 precvbuf->adapter = padapter;
  78                 list_insert_tail(&precvbuf->list,
  79                                  &(precvpriv->free_recv_buf_queue.queue));
  80                 precvbuf++;
  81         }
  82         precvpriv->free_recv_buf_queue_cnt = NR_RECVBUFF;
  83         tasklet_init(&precvpriv->recv_tasklet,
  84              (void(*)(unsigned long))recv_tasklet,
  85              (unsigned long)padapter);
  86         skb_queue_head_init(&precvpriv->rx_skb_queue);
  87
  88         skb_queue_head_init(&precvpriv->free_recv_skb_queue);
  89         for (i = 0; i < NR_PREALLOC_RECV_SKB; i++) {
  90                 pskb = netdev_alloc_skb(padapter->pnetdev, MAX_RECVBUF_SZ +
  91                        RECVBUFF_ALIGN_SZ);
  92                 if (pskb) {
  93                         pskb->dev = padapter->pnetdev;
  94                         tmpaddr = (addr_t)pskb->data;
  95                         alignment = tmpaddr & (RECVBUFF_ALIGN_SZ-1);
  96                         skb_reserve(pskb, (RECVBUFF_ALIGN_SZ - alignment));
  97                         skb_queue_tail(&precvpriv->free_recv_skb_queue, pskb);
  98                 }
  99                 pskb = NULL;
 100         }
 101         return res;
 102 }
 103
 104 void r8712_free_recv_priv(struct recv_priv *precvpriv)
 105 {
 106         int i;
 107         struct recv_buf *precvbuf;
 108         struct _adapter *padapter = precvpriv->adapter;
 109
 110         precvbuf = (struct recv_buf *)precvpriv->precv_buf;
 111         for (i = 0; i < NR_RECVBUFF; i++) {
 112                 r8712_os_recvbuf_resource_free(padapter, precvbuf);
 113                 precvbuf++;
 114         }
 115         kfree(precvpriv->pallocated_recv_buf);
 116         skb_queue_purge(&precvpriv->rx_skb_queue);
 117         if (skb_queue_len(&precvpriv->rx_skb_queue))
 118                 netdev_warn(padapter->pnetdev, "r8712u: rx_skb_queue not empty\n");
 119         skb_queue_purge(&precvpriv->free_recv_skb_queue);
 120         if (skb_queue_len(&precvpriv->free_recv_skb_queue))
 121                 netdev_warn(padapter->pnetdev, "r8712u: free_recv_skb_queue not empty %d\n",
 122                             skb_queue_len(&precvpriv->free_recv_skb_queue));
 123 }
 124
 125 int r8712_init_recvbuf(struct _adapter *padapter, struct recv_buf *precvbuf)
 126 {
 127         int res = _SUCCESS;
 128
 129         precvbuf->transfer_len = 0;
 130         precvbuf->len = 0;
 131         precvbuf->ref_cnt = 0;
 132         if (precvbuf->pbuf) {
 133                 precvbuf->pdata = precvbuf->pbuf;
 134                 precvbuf->phead = precvbuf->pbuf;
 135                 precvbuf->ptail = precvbuf->pbuf;
 136                 precvbuf->pend = precvbuf->pdata + MAX_RECVBUF_SZ;
 137         }
 138         return res;
 139 }
 140
 141 int r8712_free_recvframe(union recv_frame *precvframe,
 142                    struct  __queue *pfree_recv_queue)
 143 {
 144         unsigned long irqL;
 145         struct _adapter *padapter = precvframe->u.hdr.adapter;
 146         struct recv_priv *precvpriv = &padapter->recvpriv;
 147
 148         if (precvframe->u.hdr.pkt) {
 149                 dev_kfree_skb_any(precvframe->u.hdr.pkt);/*free skb by driver*/
 150                 precvframe->u.hdr.pkt = NULL;
 151         }
 152         spin_lock_irqsave(&pfree_recv_queue->lock, irqL);
 153         list_delete(&(precvframe->u.hdr.list));
 154         list_insert_tail(&(precvframe->u.hdr.list),
 155                          get_list_head(pfree_recv_queue));
 156         if (padapter != NULL) {
 157                 if (pfree_recv_queue == &precvpriv->free_recv_queue)
 158                                 precvpriv->free_recvframe_cnt++;
 159         }
 160         spin_unlock_irqrestore(&pfree_recv_queue->lock, irqL);
 161         return _SUCCESS;
 162 }
 163
 164 static void update_recvframe_attrib_from_recvstat(struct rx_pkt_attrib *pattrib,
 165                                            struct recv_stat *prxstat)
 166 {
 167         u32 *pphy_info;
 168         struct phy_stat *pphy_stat;
 169         u16 drvinfo_sz = 0;
 170
 171         drvinfo_sz = (le32_to_cpu(prxstat->rxdw0)&0x000f0000)>>16;
 172         drvinfo_sz = drvinfo_sz<<3;
 173         /*TODO:
 174          * Offset 0 */
 175         pattrib->bdecrypted = ((le32_to_cpu(prxstat->rxdw0) & BIT(27)) >> 27)
 176                                  ? 0 : 1;
 177         pattrib->crc_err = ((le32_to_cpu(prxstat->rxdw0) & BIT(14)) >> 14);
 178         /*Offset 4*/
 179         /*Offset 8*/
 180         /*Offset 12*/
 181         if (le32_to_cpu(prxstat->rxdw3) & BIT(13)) {
 182                 pattrib->tcpchk_valid = 1; /* valid */
 183                 if (le32_to_cpu(prxstat->rxdw3) & BIT(11))
 184                         pattrib->tcp_chkrpt = 1; /* correct */
 185                 else
 186                         pattrib->tcp_chkrpt = 0; /* incorrect */
 187                 if (le32_to_cpu(prxstat->rxdw3) & BIT(12))
 188                         pattrib->ip_chkrpt = 1; /* correct */
 189                 else
 190                         pattrib->ip_chkrpt = 0; /* incorrect */
 191         } else
 192                 pattrib->tcpchk_valid = 0; /* invalid */
 193         pattrib->mcs_rate = (u8)((le32_to_cpu(prxstat->rxdw3)) & 0x3f);
 194         pattrib->htc = (u8)((le32_to_cpu(prxstat->rxdw3) >> 14) & 0x1);
 195         /*Offset 16*/
 196         /*Offset 20*/
 197         /*phy_info*/
 198         if (drvinfo_sz) {
 199                 pphy_stat = (struct phy_stat *)(prxstat+1);
 200                 pphy_info = (u32 *)prxstat+1;
 201         }
 202 }
 203
 204 /*perform defrag*/
 205 static union recv_frame *recvframe_defrag(struct _adapter *adapter,
 206                                    struct  __queue *defrag_q)
 207 {
 208         struct list_head *plist, *phead;
 209         u8      *data, wlanhdr_offset;
 210         u8      curfragnum;
 211         struct recv_frame_hdr *pfhdr, *pnfhdr;
 212         union recv_frame *prframe, *pnextrframe;
 213         struct  __queue *pfree_recv_queue;
 214
 215         pfree_recv_queue = &adapter->recvpriv.free_recv_queue;
 216         phead = get_list_head(defrag_q);
 217         plist = get_next(phead);
 218         prframe = LIST_CONTAINOR(plist, union recv_frame, u);
 219         list_delete(&prframe->u.list);
 220         pfhdr = &prframe->u.hdr;
 221         curfragnum = 0;
 222         if (curfragnum != pfhdr->attrib.frag_num) {
 223                 /*the first fragment number must be 0
 224                  *free the whole queue*/
 225                 r8712_free_recvframe(prframe, pfree_recv_queue);
 226                 r8712_free_recvframe_queue(defrag_q, pfree_recv_queue);
 227                 return NULL;
 228         }
 229         curfragnum++;
 230         plist = get_list_head(defrag_q);
 231         plist = get_next(plist);
 232         data = get_recvframe_data(prframe);
 233         while (end_of_queue_search(phead, plist) == false) {
 234                 pnextrframe = LIST_CONTAINOR(plist, union recv_frame, u);
 235                 pnfhdr = &pnextrframe->u.hdr;
 236                 /*check the fragment sequence  (2nd ~n fragment frame) */
 237                 if (curfragnum != pnfhdr->attrib.frag_num) {
 238                         /* the fragment number must increase  (after decache)
 239                          * release the defrag_q & prframe */
 240                         r8712_free_recvframe(prframe, pfree_recv_queue);
 241                         r8712_free_recvframe_queue(defrag_q, pfree_recv_queue);
 242                         return NULL;
 243                 }
 244                 curfragnum++;
 245                 /* copy the 2nd~n fragment frame's payload to the first fragment
 246                  * get the 2nd~last fragment frame's payload */
 247                 wlanhdr_offset = pnfhdr->attrib.hdrlen + pnfhdr->attrib.iv_len;
 248                 recvframe_pull(pnextrframe, wlanhdr_offset);
 249                 /* append  to first fragment frame's tail (if privacy frame,
 250                  * pull the ICV) */
 251                 recvframe_pull_tail(prframe, pfhdr->attrib.icv_len);
 252                 memcpy(pfhdr->rx_tail, pnfhdr->rx_data, pnfhdr->len);
 253                 recvframe_put(prframe, pnfhdr->len);
 254                 pfhdr->attrib.icv_len = pnfhdr->attrib.icv_len;
 255                 plist = get_next(plist);
 256         }
 257         /* free the defrag_q queue and return the prframe */
 258         r8712_free_recvframe_queue(defrag_q, pfree_recv_queue);
 259         return prframe;
 260 }
 261
 262 /* check if need to defrag, if needed queue the frame to defrag_q */
 263 union recv_frame *r8712_recvframe_chk_defrag(struct _adapter *padapter,
 264                                              union recv_frame *precv_frame)
 265 {
 266         u8      ismfrag;
 267         u8      fragnum;
 268         u8   *psta_addr;
 269         struct recv_frame_hdr *pfhdr;
 270         struct sta_info *psta;
 271         struct  sta_priv *pstapriv;
 272         struct list_head *phead;
 273         union recv_frame *prtnframe = NULL;
 274         struct  __queue *pfree_recv_queue, *pdefrag_q;
 275
 276         pstapriv = &padapter->stapriv;
 277         pfhdr = &precv_frame->u.hdr;
 278         pfree_recv_queue = &padapter->recvpriv.free_recv_queue;
 279         /* need to define struct of wlan header frame ctrl */
 280         ismfrag = pfhdr->attrib.mfrag;
 281         fragnum = pfhdr->attrib.frag_num;
 282         psta_addr = pfhdr->attrib.ta;
 283         psta = r8712_get_stainfo(pstapriv, psta_addr);
 284         if (psta == NULL)
 285                 pdefrag_q = NULL;
 286         else
 287                 pdefrag_q = &psta->sta_recvpriv.defrag_q;
 288
 289         if ((ismfrag == 0) && (fragnum == 0))
 290                 prtnframe = precv_frame;/*isn't a fragment frame*/
 291         if (ismfrag == 1) {
 292                 /* 0~(n-1) fragment frame
 293                  * enqueue to defraf_g */
 294                 if (pdefrag_q != NULL) {
 295                         if (fragnum == 0) {
 296                                 /*the first fragment*/
 297                                 if (_queue_empty(pdefrag_q) == false) {
 298                                         /*free current defrag_q */
 299                                         r8712_free_recvframe_queue(pdefrag_q,
 300                                                              pfree_recv_queue);
 301                                 }
 302                         }
 303                         /* Then enqueue the 0~(n-1) fragment to the defrag_q */
 304                         phead = get_list_head(pdefrag_q);
 305                         list_insert_tail(&pfhdr->list, phead);
 306                         prtnframe = NULL;
 307                 } else {
 308                         /* can't find this ta's defrag_queue, so free this
 309                          * recv_frame */
 310                         r8712_free_recvframe(precv_frame, pfree_recv_queue);
 311                         prtnframe = NULL;
 312                 }
 313
 314         }
 315         if ((ismfrag == 0) && (fragnum != 0)) {
 316                 /* the last fragment frame
 317                  * enqueue the last fragment */
 318                 if (pdefrag_q != NULL) {
 319                         phead = get_list_head(pdefrag_q);
 320                         list_insert_tail(&pfhdr->list, phead);
 321                         /*call recvframe_defrag to defrag*/
 322                         precv_frame = recvframe_defrag(padapter, pdefrag_q);
 323                         prtnframe = precv_frame;
 324                 } else {
 325                         /* can't find this ta's defrag_queue, so free this
 326                          *  recv_frame */
 327                         r8712_free_recvframe(precv_frame, pfree_recv_queue);
 328                         prtnframe = NULL;
 329                 }
 330         }
 331         if ((prtnframe != NULL) && (prtnframe->u.hdr.attrib.privacy)) {
 332                 /* after defrag we must check tkip mic code */
 333                 if (r8712_recvframe_chkmic(padapter, prtnframe) == _FAIL) {
 334                         r8712_free_recvframe(prtnframe, pfree_recv_queue);
 335                         prtnframe = NULL;
 336                 }
 337         }
 338         return prtnframe;
 339 }
 340
 341 static int amsdu_to_msdu(struct _adapter *padapter, union recv_frame *prframe)
 342 {
 343         int     a_len, padding_len;
 344         u16     eth_type, nSubframe_Length;
 345         u8      nr_subframes, i;
 346         unsigned char *data_ptr, *pdata;
 347         struct rx_pkt_attrib *pattrib;
 348         _pkt *sub_skb, *subframes[MAX_SUBFRAME_COUNT];
 349         struct recv_priv *precvpriv = &padapter->recvpriv;
 350         struct  __queue *pfree_recv_queue = &(precvpriv->free_recv_queue);
 351         int     ret = _SUCCESS;
 352
 353         nr_subframes = 0;
 354         pattrib = &prframe->u.hdr.attrib;
 355         recvframe_pull(prframe, prframe->u.hdr.attrib.hdrlen);
 356         if (prframe->u.hdr.attrib.iv_len > 0)
 357                 recvframe_pull(prframe, prframe->u.hdr.attrib.iv_len);
 358         a_len = prframe->u.hdr.len;
 359         pdata = prframe->u.hdr.rx_data;
 360         while (a_len > ETH_HLEN) {
 361                 /* Offset 12 denote 2 mac address */
 362                 nSubframe_Length = *((u16 *)(pdata + 12));
 363                 /*==m==>change the length order*/
 364                 nSubframe_Length = (nSubframe_Length >> 8) +
 365                                    (nSubframe_Length << 8);
 366                 if (a_len < (ETHERNET_HEADER_SIZE + nSubframe_Length)) {
 367                         netdev_warn(padapter->pnetdev, "r8712u: nRemain_Length is %d and nSubframe_Length is: %d\n",
 368                                     a_len, nSubframe_Length);
 369                         goto exit;
 370                 }
 371                 /* move the data point to data content */
 372                 pdata += ETH_HLEN;
 373                 a_len -= ETH_HLEN;
 374                 /* Allocate new skb for releasing to upper layer */
 375                 sub_skb = dev_alloc_skb(nSubframe_Length + 12);
 376                 if (!sub_skb)
 377                         break;
 378                 skb_reserve(sub_skb, 12);
 379                 data_ptr = (u8 *)skb_put(sub_skb, nSubframe_Length);
 380                 memcpy(data_ptr, pdata, nSubframe_Length);
 381                 subframes[nr_subframes++] = sub_skb;
 382                 if (nr_subframes >= MAX_SUBFRAME_COUNT) {
 383                         netdev_warn(padapter->pnetdev, "r8712u: ParseSubframe(): Too many Subframes! Packets dropped!\n");
 384                         break;
 385                 }
 386                 pdata += nSubframe_Length;
 387                 a_len -= nSubframe_Length;
 388                 if (a_len != 0) {
 389                         padding_len = 4 - ((nSubframe_Length + ETH_HLEN) & 3);
 390                         if (padding_len == 4)
 391                                 padding_len = 0;
 392                         if (a_len < padding_len)
 393                                 goto exit;
 394                         pdata += padding_len;
 395                         a_len -= padding_len;
 396                 }
 397         }
 398         for (i = 0; i < nr_subframes; i++) {
 399                 sub_skb = subframes[i];
 400                 /* convert hdr + possible LLC headers into Ethernet header */
 401                 eth_type = (sub_skb->data[6] << 8) | sub_skb->data[7];
 402                 if (sub_skb->len >= 8 &&
 403                    ((!memcmp(sub_skb->data, rfc1042_header, SNAP_SIZE) &&
 404                    eth_type != ETH_P_AARP && eth_type != ETH_P_IPX) ||
 405                    !memcmp(sub_skb->data, bridge_tunnel_header, SNAP_SIZE))) {
 406                         /* remove RFC1042 or Bridge-Tunnel encapsulation and
 407                          * replace EtherType */
 408                         skb_pull(sub_skb, SNAP_SIZE);
 409                         memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->src,
 410                                 ETH_ALEN);
 411                         memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->dst,
 412                                 ETH_ALEN);
 413                 } else {
 414                         u16 len;
 415                         /* Leave Ethernet header part of hdr and full payload */
 416                         len = htons(sub_skb->len);
 417                         memcpy(skb_push(sub_skb, 2), &len, 2);
 418                         memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->src,
 419                                 ETH_ALEN);
 420                         memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->dst,
 421                                 ETH_ALEN);
 422                 }
 423                 /* Indicate the packets to upper layer */
 424                 if (sub_skb) {
 425                         sub_skb->protocol =
 426                                  eth_type_trans(sub_skb, padapter->pnetdev);
 427                         sub_skb->dev = padapter->pnetdev;
 428                         if ((pattrib->tcpchk_valid == 1) &&
 429                             (pattrib->tcp_chkrpt == 1)) {
 430                                 sub_skb->ip_summed = CHECKSUM_UNNECESSARY;
 431                         } else
 432                                 sub_skb->ip_summed = CHECKSUM_NONE;
 433                         netif_rx(sub_skb);
 434                 }
 435         }
 436 exit:
 437         prframe->u.hdr.len = 0;
 438         r8712_free_recvframe(prframe, pfree_recv_queue);
 439         return ret;
 440 }
 441
 442 void r8712_rxcmd_event_hdl(struct _adapter *padapter, void *prxcmdbuf)
 443 {
 444         uint voffset;
 445         u8 *poffset;
 446         u16 pkt_len, cmd_len, drvinfo_sz;
 447         u8 eid, cmd_seq;
 448         struct recv_stat *prxstat;
 449
 450         poffset = (u8 *)prxcmdbuf;
 451         voffset = *(uint *)poffset;
 452         pkt_len = le32_to_cpu(voffset) & 0x00003fff;
 453         prxstat = (struct recv_stat *)prxcmdbuf;
 454         drvinfo_sz = ((le32_to_cpu(prxstat->rxdw0) & 0x000f0000) >> 16);
 455         drvinfo_sz = drvinfo_sz << 3;
 456         poffset += RXDESC_SIZE + drvinfo_sz;
 457         do {
 458                 voffset  = *(uint *)poffset;
 459                 cmd_len = (u16)(le32_to_cpu(voffset) & 0xffff);
 460                 cmd_seq = (u8)((le32_to_cpu(voffset) >> 24) & 0x7f);
 461                 eid = (u8)((le32_to_cpu(voffset) >> 16) & 0xff);
 462                 r8712_event_handle(padapter, (uint *)poffset);
 463                 poffset += (cmd_len + 8);/*8 bytes alignment*/
 464         } while (le32_to_cpu(voffset) & BIT(31));
 465
 466 }
 467
 468 static int check_indicate_seq(struct recv_reorder_ctrl *preorder_ctrl,
 469                               u16 seq_num)
 470 {
 471         u8 wsize = preorder_ctrl->wsize_b;
 472         u16 wend = (preorder_ctrl->indicate_seq + wsize - 1) % 4096;
 473
 474         /* Rx Reorder initialize condition.*/
 475         if (preorder_ctrl->indicate_seq == 0xffff)
 476                 preorder_ctrl->indicate_seq = seq_num;
 477         /* Drop out the packet which SeqNum is smaller than WinStart */
 478         if (SN_LESS(seq_num, preorder_ctrl->indicate_seq))
 479                 return false;
 480         /*
 481          * Sliding window manipulation. Conditions includes:
 482          * 1. Incoming SeqNum is equal to WinStart =>Window shift 1
 483          * 2. Incoming SeqNum is larger than the WinEnd => Window shift N
 484          */
 485         if (SN_EQUAL(seq_num, preorder_ctrl->indicate_seq))
 486                 preorder_ctrl->indicate_seq = (preorder_ctrl->indicate_seq +
 487                                               1) % 4096;
 488         else if (SN_LESS(wend, seq_num)) {
 489                 if (seq_num >= (wsize - 1))
 490                         preorder_ctrl->indicate_seq = seq_num + 1 - wsize;
 491                 else
 492                         preorder_ctrl->indicate_seq = 4095 - (wsize -
 493                                                       (seq_num + 1)) + 1;
 494         }
 495         return true;
 496 }
 497
 498 static int enqueue_reorder_recvframe(struct recv_reorder_ctrl *preorder_ctrl,
 499                               union recv_frame *prframe)
 500 {
 501         struct list_head *phead, *plist;
 502         union recv_frame *pnextrframe;
 503         struct rx_pkt_attrib *pnextattrib;
 504         struct  __queue *ppending_recvframe_queue =
 505                                         &preorder_ctrl->pending_recvframe_queue;
 506         struct rx_pkt_attrib *pattrib = &prframe->u.hdr.attrib;
 507
 508         phead = get_list_head(ppending_recvframe_queue);
 509         plist = get_next(phead);
 510         while (end_of_queue_search(phead, plist) == false) {
 511                 pnextrframe = LIST_CONTAINOR(plist, union recv_frame, u);
 512                 pnextattrib = &pnextrframe->u.hdr.attrib;
 513                 if (SN_LESS(pnextattrib->seq_num, pattrib->seq_num))
 514                         plist = get_next(plist);
 515                 else if (SN_EQUAL(pnextattrib->seq_num, pattrib->seq_num))
 516                         return false;
 517                 else
 518                         break;
 519         }
 520         list_delete(&(prframe->u.hdr.list));
 521         list_insert_tail(&(prframe->u.hdr.list), plist);
 522         return true;
 523 }
 524
 525 int r8712_recv_indicatepkts_in_order(struct _adapter *padapter,
 526                                struct recv_reorder_ctrl *preorder_ctrl,
 527                                int bforced)
 528 {
 529         struct list_head *phead, *plist;
 530         union recv_frame *prframe;
 531         struct rx_pkt_attrib *pattrib;
 532         int bPktInBuf = false;
 533         struct recv_priv *precvpriv = &padapter->recvpriv;
 534         struct  __queue *ppending_recvframe_queue =
 535                          &preorder_ctrl->pending_recvframe_queue;
 536
 537         phead = get_list_head(ppending_recvframe_queue);
 538         plist = get_next(phead);
 539         /* Handling some condition for forced indicate case.*/
 540         if (bforced == true) {
 541                 if (is_list_empty(phead))
 542                         return true;
 543                 else {
 544                         prframe = LIST_CONTAINOR(plist, union recv_frame, u);
 545                         pattrib = &prframe->u.hdr.attrib;
 546                         preorder_ctrl->indicate_seq = pattrib->seq_num;
 547                 }
 548         }
 549         /* Prepare indication list and indication.
 550          * Check if there is any packet need indicate. */
 551         while (!is_list_empty(phead)) {
 552                 prframe = LIST_CONTAINOR(plist, union recv_frame, u);
 553                 pattrib = &prframe->u.hdr.attrib;
 554                 if (!SN_LESS(preorder_ctrl->indicate_seq, pattrib->seq_num)) {
 555                         plist = get_next(plist);
 556                         list_delete(&(prframe->u.hdr.list));
 557                         if (SN_EQUAL(preorder_ctrl->indicate_seq,
 558                             pattrib->seq_num))
 559                                 preorder_ctrl->indicate_seq =
 560                                   (preorder_ctrl->indicate_seq + 1) % 4096;
 561                         /*indicate this recv_frame*/
 562                         if (!pattrib->amsdu) {
 563                                 if ((padapter->bDriverStopped == false) &&
 564                                     (padapter->bSurpriseRemoved == false)) {
 565                                         /* indicate this recv_frame */
 566                                         r8712_recv_indicatepkt(padapter,
 567                                                                prframe);
 568                                 }
 569                         } else if (pattrib->amsdu == 1) {
 570                                 if (amsdu_to_msdu(padapter, prframe) !=
 571                                     _SUCCESS)
 572                                         r8712_free_recvframe(prframe,
 573                                                    &precvpriv->free_recv_queue);
 574                         }
 575                         /* Update local variables. */
 576                         bPktInBuf = false;
 577                 } else {
 578                         bPktInBuf = true;
 579                         break;
 580                 }
 581         }
 582         return bPktInBuf;
 583 }
 584
 585 static int recv_indicatepkt_reorder(struct _adapter *padapter,
 586                              union recv_frame *prframe)
 587 {
 588         unsigned long irql;
 589         struct rx_pkt_attrib *pattrib = &prframe->u.hdr.attrib;
 590         struct recv_reorder_ctrl *preorder_ctrl = prframe->u.hdr.preorder_ctrl;
 591         struct  __queue *ppending_recvframe_queue =
 592                          &preorder_ctrl->pending_recvframe_queue;
 593
 594         if (!pattrib->amsdu) {
 595                 /* s1. */
 596                 r8712_wlanhdr_to_ethhdr(prframe);
 597                 if (pattrib->qos != 1) {
 598                         if ((padapter->bDriverStopped == false) &&
 599                            (padapter->bSurpriseRemoved == false)) {
 600                                 r8712_recv_indicatepkt(padapter, prframe);
 601                                 return _SUCCESS;
 602                         } else
 603                                 return _FAIL;
 604                 }
 605         }
 606         spin_lock_irqsave(&ppending_recvframe_queue->lock, irql);
 607         /*s2. check if winstart_b(indicate_seq) needs to be updated*/
 608         if (!check_indicate_seq(preorder_ctrl, pattrib->seq_num))
 609                 goto _err_exit;
 610         /*s3. Insert all packet into Reorder Queue to maintain its ordering.*/
 611         if (!enqueue_reorder_recvframe(preorder_ctrl, prframe))
 612                 goto _err_exit;
 613         /*s4.
 614          * Indication process.
 615          * After Packet dropping and Sliding Window shifting as above, we can
 616          * now just indicate the packets with the SeqNum smaller than latest
 617          * WinStart and buffer other packets.
 618          *
 619          * For Rx Reorder condition:
 620          * 1. All packets with SeqNum smaller than WinStart => Indicate
 621          * 2. All packets with SeqNum larger than or equal to
 622          * WinStart => Buffer it.
 623          */
 624         if (r8712_recv_indicatepkts_in_order(padapter, preorder_ctrl, false) ==
 625             true) {
 626                 _set_timer(&preorder_ctrl->reordering_ctrl_timer,
 627                            REORDER_WAIT_TIME);
 628                 spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
 629         } else {
 630                 spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
 631                 _cancel_timer_ex(&preorder_ctrl->reordering_ctrl_timer);
 632         }
 633         return _SUCCESS;
 634 _err_exit:
 635         spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
 636         return _FAIL;
 637 }
 638
 639 void r8712_reordering_ctrl_timeout_handler(void *pcontext)
 640 {
 641         unsigned long irql;
 642         struct recv_reorder_ctrl *preorder_ctrl =
 643                                  (struct recv_reorder_ctrl *)pcontext;
 644         struct _adapter *padapter = preorder_ctrl->padapter;
 645         struct  __queue *ppending_recvframe_queue =
 646                                  &preorder_ctrl->pending_recvframe_queue;
 647
 648         if (padapter->bDriverStopped || padapter->bSurpriseRemoved)
 649                 return;
 650         spin_lock_irqsave(&ppending_recvframe_queue->lock, irql);
 651         r8712_recv_indicatepkts_in_order(padapter, preorder_ctrl, true);
 652         spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
 653 }
 654
 655 static int r8712_process_recv_indicatepkts(struct _adapter *padapter,
 656                               union recv_frame *prframe)
 657 {
 658         int retval = _SUCCESS;
 659         struct mlme_priv *pmlmepriv = &padapter->mlmepriv;
 660         struct ht_priv  *phtpriv = &pmlmepriv->htpriv;
 661
 662         if (phtpriv->ht_option == 1) { /*B/G/N Mode*/
 663                 if (recv_indicatepkt_reorder(padapter, prframe) != _SUCCESS) {
 664                         /* including perform A-MPDU Rx Ordering Buffer Control*/
 665                         if ((padapter->bDriverStopped == false) &&
 666                             (padapter->bSurpriseRemoved == false))
 667                                 return _FAIL;
 668                 }
 669         } else { /*B/G mode*/
 670                 retval = r8712_wlanhdr_to_ethhdr(prframe);
 671                 if (retval != _SUCCESS)
 672                         return retval;
 673                 if ((padapter->bDriverStopped == false) &&
 674                     (padapter->bSurpriseRemoved == false)) {
 675                         /* indicate this recv_frame */
 676                         r8712_recv_indicatepkt(padapter, prframe);
 677                 } else
 678                         return _FAIL;
 679         }
 680         return retval;
 681 }
 682
 683 static u8 query_rx_pwr_percentage(s8 antpower)
 684 {
 685         if ((antpower <= -100) || (antpower >= 20))
 686                 return  0;
 687         else if (antpower >= 0)
 688                 return  100;
 689         else
 690                 return 100 + antpower;
 691 }
 692
 693 static u8 evm_db2percentage(s8 value)
 694 {
 695         /*
 696          * -33dB~0dB to 0%~99%
 697          */
 698         s8 ret_val;
 699
 700         ret_val = value;
 701         if (ret_val >= 0)
 702                 ret_val = 0;
 703         if (ret_val <= -33)
 704                 ret_val = -33;
 705         ret_val = -ret_val;
 706         ret_val *= 3;
 707         if (ret_val == 99)
 708                 ret_val = 100;
 709         return ret_val;
 710 }
 711
 712 s32 r8712_signal_scale_mapping(s32 cur_sig)
 713 {
 714         s32 ret_sig;
 715
 716         if (cur_sig >= 51 && cur_sig <= 100)
 717                 ret_sig = 100;
 718         else if (cur_sig >= 41 && cur_sig <= 50)
 719                 ret_sig = 80 + ((cur_sig - 40) * 2);
 720         else if (cur_sig >= 31 && cur_sig <= 40)
 721                 ret_sig = 66 + (cur_sig - 30);
 722         else if (cur_sig >= 21 && cur_sig <= 30)
 723                 ret_sig = 54 + (cur_sig - 20);
 724         else if (cur_sig >= 10 && cur_sig <= 20)
 725                 ret_sig = 42 + (((cur_sig - 10) * 2) / 3);
 726         else if (cur_sig >= 5 && cur_sig <= 9)
 727                 ret_sig = 22 + (((cur_sig - 5) * 3) / 2);
 728         else if (cur_sig >= 1 && cur_sig <= 4)
 729                 ret_sig = 6 + (((cur_sig - 1) * 3) / 2);
 730         else
 731                 ret_sig = cur_sig;
 732         return ret_sig;
 733 }
 734
 735 static s32  translate2dbm(struct _adapter *padapter, u8 signal_strength_idx)
 736 {
 737         s32 signal_power; /* in dBm.*/
 738         /* Translate to dBm (x=0.5y-95).*/
 739         signal_power = (s32)((signal_strength_idx + 1) >> 1);
 740         signal_power -= 95;
 741         return signal_power;
 742 }
 743
 744 static void query_rx_phy_status(struct _adapter *padapter,
 745                                 union recv_frame *prframe)
 746 {
 747         u8 i, max_spatial_stream, evm;
 748         struct recv_stat *prxstat = (struct recv_stat *)prframe->u.hdr.rx_head;
 749         struct phy_stat *pphy_stat = (struct phy_stat *)(prxstat + 1);
 750         u8 *pphy_head = (u8 *)(prxstat + 1);
 751         s8 rx_pwr[4], rx_pwr_all;
 752         u8 pwdb_all;
 753         u32 rssi, total_rssi = 0;
 754         u8 bcck_rate = 0, rf_rx_num = 0, cck_highpwr = 0;
 755         struct phy_cck_rx_status *pcck_buf;
 756         u8 sq;
 757
 758         /* Record it for next packet processing*/
 759         bcck_rate = (prframe->u.hdr.attrib.mcs_rate <= 3 ? 1 : 0);
 760         if (bcck_rate) {
 761                 u8 report;
 762
 763                 /* CCK Driver info Structure is not the same as OFDM packet.*/
 764                 pcck_buf = (struct phy_cck_rx_status *)pphy_stat;
 765                 /* (1)Hardware does not provide RSSI for CCK
 766                  * (2)PWDB, Average PWDB cacluated by hardware
 767                  * (for rate adaptive)
 768                  */
 769                 if (!cck_highpwr) {
 770                         report = pcck_buf->cck_agc_rpt & 0xc0;
 771                         report = report >> 6;
 772                         switch (report) {
 773                         /* Modify the RF RNA gain value to -40, -20,
 774                          * -2, 14 by Jenyu's suggestion
 775                          * Note: different RF with the different
 776                          * RNA gain. */
 777                         case 0x3:
 778                                 rx_pwr_all = -40 - (pcck_buf->cck_agc_rpt &
 779                                              0x3e);
 780                                 break;
 781                         case 0x2:
 782                                 rx_pwr_all = -20 - (pcck_buf->cck_agc_rpt &
 783                                              0x3e);
 784                                 break;
 785                         case 0x1:
 786                                 rx_pwr_all = -2 - (pcck_buf->cck_agc_rpt &
 787                                              0x3e);
 788                                 break;
 789                         case 0x0:
 790                                 rx_pwr_all = 14 - (pcck_buf->cck_agc_rpt &
 791                                              0x3e);
 792                                 break;
 793                         }
 794                 } else {
 795                         report = ((u8)(le32_to_cpu(pphy_stat->phydw1) >> 8)) &
 796                                  0x60;
 797                         report = report >> 5;
 798                         switch (report) {
 799                         case 0x3:
 800                                 rx_pwr_all = -40 - ((pcck_buf->cck_agc_rpt &
 801                                              0x1f) << 1);
 802                                 break;
 803                         case 0x2:
 804                                 rx_pwr_all = -20 - ((pcck_buf->cck_agc_rpt &
 805                                              0x1f) << 1);
 806                                 break;
 807                         case 0x1:
 808                                 rx_pwr_all = -2 - ((pcck_buf->cck_agc_rpt &
 809                                              0x1f) << 1);
 810                                 break;
 811                         case 0x0:
 812                                 rx_pwr_all = 14 - ((pcck_buf->cck_agc_rpt &
 813                                              0x1f) << 1);
 814                                 break;
 815                         }
 816                 }
 817                 pwdb_all = query_rx_pwr_percentage(rx_pwr_all);
 818                 /* CCK gain is smaller than OFDM/MCS gain,*/
 819                 /* so we add gain diff by experiences, the val is 6 */
 820                 pwdb_all += 6;
 821                 if (pwdb_all > 100)
 822                         pwdb_all = 100;
 823                 /* modify the offset to make the same gain index with OFDM.*/
 824                 if (pwdb_all > 34 && pwdb_all <= 42)
 825                         pwdb_all -= 2;
 826                 else if (pwdb_all > 26 && pwdb_all <= 34)
 827                         pwdb_all -= 6;
 828                 else if (pwdb_all > 14 && pwdb_all <= 26)
 829                         pwdb_all -= 8;
 830                 else if (pwdb_all > 4 && pwdb_all <= 14)
 831                         pwdb_all -= 4;
 832                 /*
 833                  * (3) Get Signal Quality (EVM)
 834                  */
 835                 if (pwdb_all > 40)
 836                         sq = 100;
 837                 else {
 838                         sq = pcck_buf->sq_rpt;
 839                         if (pcck_buf->sq_rpt > 64)
 840                                 sq = 0;
 841                         else if (pcck_buf->sq_rpt < 20)
 842                                 sq = 100;
 843                         else
 844                                 sq = ((64-sq) * 100) / 44;
 845                 }
 846                 prframe->u.hdr.attrib.signal_qual = sq;
 847                 prframe->u.hdr.attrib.rx_mimo_signal_qual[0] = sq;
 848                 prframe->u.hdr.attrib.rx_mimo_signal_qual[1] = -1;
 849         } else {
 850                 /* (1)Get RSSI for HT rate */
 851                 for (i = 0; i < ((padapter->registrypriv.rf_config) &
 852                             0x0f); i++) {
 853                         rf_rx_num++;
 854                         rx_pwr[i] = ((pphy_head[PHY_STAT_GAIN_TRSW_SHT + i]
 855                                     & 0x3F) * 2) - 110;
 856                         /* Translate DBM to percentage. */
 857                         rssi = query_rx_pwr_percentage(rx_pwr[i]);
 858                         total_rssi += rssi;
 859                 }
 860                 /* (2)PWDB, Average PWDB cacluated by hardware (for
 861                  * rate adaptive) */
 862                 rx_pwr_all = (((pphy_head[PHY_STAT_PWDB_ALL_SHT]) >> 1) & 0x7f)
 863                              - 106;
 864                 pwdb_all = query_rx_pwr_percentage(rx_pwr_all);
 865
 866                 {
 867                         /* (3)EVM of HT rate */
 868                         if (prframe->u.hdr.attrib.htc &&
 869                             prframe->u.hdr.attrib.mcs_rate >= 20 &&
 870                             prframe->u.hdr.attrib.mcs_rate <= 27) {
 871                                 /* both spatial stream make sense */
 872                                 max_spatial_stream = 2;
 873                         } else {
 874                                 /* only spatial stream 1 makes sense */
 875                                 max_spatial_stream = 1;
 876                         }
 877                         for (i = 0; i < max_spatial_stream; i++) {
 878                                 evm = evm_db2percentage((pphy_head
 879                                       [PHY_STAT_RXEVM_SHT + i]));/*dbm*/
 880                                 prframe->u.hdr.attrib.signal_qual =
 881                                          (u8)(evm & 0xff);
 882                                 prframe->u.hdr.attrib.rx_mimo_signal_qual[i] =
 883                                          (u8)(evm & 0xff);
 884                         }
 885                 }
 886         }
 887         /* UI BSS List signal strength(in percentage), make it good looking,
 888          * from 0~100. It is assigned to the BSS List in
 889          * GetValueFromBeaconOrProbeRsp(). */
 890         if (bcck_rate)
 891                 prframe->u.hdr.attrib.signal_strength =
 892                          (u8)r8712_signal_scale_mapping(pwdb_all);
 893         else {
 894                 if (rf_rx_num != 0)
 895                         prframe->u.hdr.attrib.signal_strength =
 896                                  (u8)(r8712_signal_scale_mapping(total_rssi /=
 897                                  rf_rx_num));
 898         }
 899 }
 900
 901 static void process_link_qual(struct _adapter *padapter,
 902                               union recv_frame *prframe)
 903 {
 904         u32     last_evm = 0, tmpVal;
 905         struct rx_pkt_attrib *pattrib;
 906
 907         if (prframe == NULL || padapter == NULL)
 908                 return;
 909         pattrib = &prframe->u.hdr.attrib;
 910         if (pattrib->signal_qual != 0) {
 911                 /*
 912                  * 1. Record the general EVM to the sliding window.
 913                  */
 914                 if (padapter->recvpriv.signal_qual_data.total_num++ >=
 915                                   PHY_LINKQUALITY_SLID_WIN_MAX) {
 916                         padapter->recvpriv.signal_qual_data.total_num =
 917                                   PHY_LINKQUALITY_SLID_WIN_MAX;
 918                         last_evm = padapter->recvpriv.signal_qual_data.elements
 919                                   [padapter->recvpriv.signal_qual_data.index];
 920                         padapter->recvpriv.signal_qual_data.total_val -=
 921                                   last_evm;
 922                 }
 923                 padapter->recvpriv.signal_qual_data.total_val +=
 924                           pattrib->signal_qual;
 925                 padapter->recvpriv.signal_qual_data.elements[padapter->
 926                           recvpriv.signal_qual_data.index++] =
 927                           pattrib->signal_qual;
 928                 if (padapter->recvpriv.signal_qual_data.index >=
 929                     PHY_LINKQUALITY_SLID_WIN_MAX)
 930                         padapter->recvpriv.signal_qual_data.index = 0;
 931
 932                 /* <1> Showed on UI for user, in percentage. */
 933                 tmpVal = padapter->recvpriv.signal_qual_data.total_val /
 934                          padapter->recvpriv.signal_qual_data.total_num;
 935                 padapter->recvpriv.signal = (u8)tmpVal;
 936         }
 937 }
 938
 939 static void process_rssi(struct _adapter *padapter, union recv_frame *prframe)
 940 {
 941         u32 last_rssi, tmp_val;
 942         struct rx_pkt_attrib *pattrib = &prframe->u.hdr.attrib;
 943
 944         if (padapter->recvpriv.signal_strength_data.total_num++ >=
 945             PHY_RSSI_SLID_WIN_MAX) {
 946                 padapter->recvpriv.signal_strength_data.total_num =
 947                          PHY_RSSI_SLID_WIN_MAX;
 948                 last_rssi = padapter->recvpriv.signal_strength_data.elements
 949                             [padapter->recvpriv.signal_strength_data.index];
 950                 padapter->recvpriv.signal_strength_data.total_val -= last_rssi;
 951         }
 952         padapter->recvpriv.signal_strength_data.total_val +=
 953                         pattrib->signal_strength;
 954         padapter->recvpriv.signal_strength_data.elements[padapter->recvpriv.
 955                         signal_strength_data.index++] =
 956                         pattrib->signal_strength;
 957         if (padapter->recvpriv.signal_strength_data.index >=
 958             PHY_RSSI_SLID_WIN_MAX)
 959                 padapter->recvpriv.signal_strength_data.index = 0;
 960         tmp_val = padapter->recvpriv.signal_strength_data.total_val /
 961                   padapter->recvpriv.signal_strength_data.total_num;
 962         padapter->recvpriv.rssi = (s8)translate2dbm(padapter, (u8)tmp_val);
 963 }
 964
 965 static void process_phy_info(struct _adapter *padapter,
 966                              union recv_frame *prframe)
 967 {
 968         query_rx_phy_status(padapter, prframe);
 969         process_rssi(padapter, prframe);
 970         process_link_qual(padapter,  prframe);
 971 }
 972
 973 int recv_func(struct _adapter *padapter, void *pcontext)
 974 {
 975         struct rx_pkt_attrib *pattrib;
 976         union recv_frame *prframe, *orig_prframe;
 977         int retval = _SUCCESS;
 978         struct  __queue *pfree_recv_queue = &padapter->recvpriv.free_recv_queue;
 979         struct  mlme_priv       *pmlmepriv = &padapter->mlmepriv;
 980
 981         prframe = (union recv_frame *)pcontext;
 982         orig_prframe = prframe;
 983         pattrib = &prframe->u.hdr.attrib;
 984         if ((check_fwstate(pmlmepriv, WIFI_MP_STATE) == true)) {
 985                 if (pattrib->crc_err == 1)
 986                         padapter->mppriv.rx_crcerrpktcount++;
 987                 else
 988                         padapter->mppriv.rx_pktcount++;
 989                 if (check_fwstate(pmlmepriv, WIFI_MP_LPBK_STATE) == false) {
 990                         /* free this recv_frame */
 991                         r8712_free_recvframe(orig_prframe, pfree_recv_queue);
 992                         goto _exit_recv_func;
 993                 }
 994         }
 995         /* check the frame crtl field and decache */
 996         retval = r8712_validate_recv_frame(padapter, prframe);
 997         if (retval != _SUCCESS) {
 998                 /* free this recv_frame */
 999                 r8712_free_recvframe(orig_prframe, pfree_recv_queue);
1000                 goto _exit_recv_func;
1001         }
1002         process_phy_info(padapter, prframe);
1003         prframe = r8712_decryptor(padapter, prframe);
1004         if (prframe == NULL) {
1005                 retval = _FAIL;
1006                 goto _exit_recv_func;
1007         }
1008         prframe = r8712_recvframe_chk_defrag(padapter, prframe);
1009         if (prframe == NULL)
1010                 goto _exit_recv_func;
1011         prframe = r8712_portctrl(padapter, prframe);
1012         if (prframe == NULL) {
1013                 retval = _FAIL;
1014                 goto _exit_recv_func;
1015         }
1016         retval = r8712_process_recv_indicatepkts(padapter, prframe);
1017         if (retval != _SUCCESS) {
1018                 r8712_free_recvframe(orig_prframe, pfree_recv_queue);
1019                 goto _exit_recv_func;
1020         }
1021 _exit_recv_func:
1022         return retval;
1023 }
1024
1025 static int recvbuf2recvframe(struct _adapter *padapter, struct sk_buff *pskb)
1026 {
1027         u8 *pbuf, shift_sz = 0;
1028         u8      frag, mf;
1029         uint    pkt_len;
1030         u32 transfer_len;
1031         struct recv_stat *prxstat;
1032         u16     pkt_cnt, drvinfo_sz, pkt_offset, tmp_len, alloc_sz;
1033         struct  __queue *pfree_recv_queue;
1034         _pkt  *pkt_copy = NULL;
1035         union recv_frame *precvframe = NULL;
1036         struct recv_priv *precvpriv = &padapter->recvpriv;
1037
1038         pfree_recv_queue = &(precvpriv->free_recv_queue);
1039         pbuf = pskb->data;
1040         prxstat = (struct recv_stat *)pbuf;
1041         pkt_cnt = (le32_to_cpu(prxstat->rxdw2)>>16)&0xff;
1042         pkt_len =  le32_to_cpu(prxstat->rxdw0)&0x00003fff;
1043         transfer_len = pskb->len;
1044         /* Test throughput with Netgear 3700 (No security) with Chariot 3T3R
1045          * pairs. The packet count will be a big number so that the containing
1046          * packet will effect the Rx reordering. */
1047         if (transfer_len < pkt_len) {
1048                 /* In this case, it means the MAX_RECVBUF_SZ is too small to
1049                  * get the data from 8712u. */
1050                 return _FAIL;
1051         }
1052         do {
1053                 prxstat = (struct recv_stat *)pbuf;
1054                 pkt_len =  le32_to_cpu(prxstat->rxdw0)&0x00003fff;
1055                 /* more fragment bit */
1056                 mf = (le32_to_cpu(prxstat->rxdw1) >> 27) & 0x1;
1057                 /* ragmentation number */
1058                 frag = (le32_to_cpu(prxstat->rxdw2) >> 12) & 0xf;
1059                 /* uint 2^3 = 8 bytes */
1060                 drvinfo_sz = (le32_to_cpu(prxstat->rxdw0) & 0x000f0000) >> 16;
1061                 drvinfo_sz = drvinfo_sz<<3;
1062                 if (pkt_len <= 0)
1063                         goto  _exit_recvbuf2recvframe;
1064                 /* Qos data, wireless lan header length is 26 */
1065                 if ((le32_to_cpu(prxstat->rxdw0) >> 23) & 0x01)
1066                         shift_sz = 2;
1067                 precvframe = r8712_alloc_recvframe(pfree_recv_queue);
1068                 if (precvframe == NULL)
1069                         goto  _exit_recvbuf2recvframe;
1070                 _init_listhead(&precvframe->u.hdr.list);
1071                 precvframe->u.hdr.precvbuf = NULL; /*can't access the precvbuf*/
1072                 precvframe->u.hdr.len = 0;
1073                 tmp_len = pkt_len + drvinfo_sz + RXDESC_SIZE;
1074                 pkt_offset = (u16)_RND128(tmp_len);
1075                 /* for first fragment packet, driver need allocate 1536 +
1076                  * drvinfo_sz + RXDESC_SIZE to defrag packet. */
1077                 if ((mf == 1) && (frag == 0))
1078                         alloc_sz = 1658;/*1658+6=1664, 1664 is 128 alignment.*/
1079                 else
1080                         alloc_sz = tmp_len;
1081                 /* 2 is for IP header 4 bytes alignment in QoS packet case.
1082                  * 4 is for skb->data 4 bytes alignment. */
1083                 alloc_sz += 6;
1084                 pkt_copy = netdev_alloc_skb(padapter->pnetdev, alloc_sz);
1085                 if (pkt_copy) {
1086                         pkt_copy->dev = padapter->pnetdev;
1087                         precvframe->u.hdr.pkt = pkt_copy;
1088                         skb_reserve(pkt_copy, 4 - ((addr_t)(pkt_copy->data)
1089                                     % 4));
1090                         skb_reserve(pkt_copy, shift_sz);
1091                         memcpy(pkt_copy->data, pbuf, tmp_len);
1092                         precvframe->u.hdr.rx_head = precvframe->u.hdr.rx_data =
1093                                  precvframe->u.hdr.rx_tail = pkt_copy->data;
1094                         precvframe->u.hdr.rx_end = pkt_copy->data + alloc_sz;
1095                 } else {
1096                         precvframe->u.hdr.pkt = skb_clone(pskb, GFP_ATOMIC);
1097                         if (!precvframe->u.hdr.pkt)
1098                                 return _FAIL;
1099                         precvframe->u.hdr.rx_head = pbuf;
1100                         precvframe->u.hdr.rx_data = pbuf;
1101                         precvframe->u.hdr.rx_tail = pbuf;
1102                         precvframe->u.hdr.rx_end = pbuf + alloc_sz;
1103                 }
1104                 recvframe_put(precvframe, tmp_len);
1105                 recvframe_pull(precvframe, drvinfo_sz + RXDESC_SIZE);
1106                 /* because the endian issue, driver avoid reference to the
1107                  * rxstat after calling update_recvframe_attrib_from_recvstat();
1108                  */
1109                 update_recvframe_attrib_from_recvstat(&precvframe->u.hdr.attrib,
1110                                                       prxstat);
1111                 r8712_recv_entry(precvframe);
1112                 transfer_len -= pkt_offset;
1113                 pbuf += pkt_offset;
1114                 pkt_cnt--;
1115                 precvframe = NULL;
1116                 pkt_copy = NULL;
1117         } while ((transfer_len > 0) && pkt_cnt > 0);
1118 _exit_recvbuf2recvframe:
1119         return _SUCCESS;
1120 }
1121
1122 static void recv_tasklet(void *priv)
1123 {
1124         struct sk_buff *pskb;
1125         struct _adapter *padapter = (struct _adapter *)priv;
1126         struct recv_priv *precvpriv = &padapter->recvpriv;
1127
1128         while (NULL != (pskb = skb_dequeue(&precvpriv->rx_skb_queue))) {
1129                 recvbuf2recvframe(padapter, pskb);
1130                 skb_reset_tail_pointer(pskb);
1131                 pskb->len = 0;
1132                 if (!skb_cloned(pskb))
1133                         skb_queue_tail(&precvpriv->free_recv_skb_queue, pskb);
1134                 else
1135                         consume_skb(pskb);
1136         }
1137 }