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