drivers/staging/rtl8712/rtl8712_recv.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /******************************************************************************
   3  * rtl8712_recv.c
   4  *
   5  * Copyright(c) 2007 - 2010 Realtek Corporation. All rights reserved.
   6  * Linux device driver for RTL8192SU
   7  *
   8  * Modifications for inclusion into the Linux staging tree are
   9  * Copyright(c) 2010 Larry Finger. All rights reserved.
  10  *
  11  * Contact information:
  12  * WLAN FAE <wlanfae@realtek.com>
  13  * Larry Finger <Larry.Finger@lwfinger.net>
  14  *
  15  ******************************************************************************/
  16
  17 #define _RTL8712_RECV_C_
  18
  19 #include <linux/if_ether.h>
  20 #include <linux/ip.h>
  21 #include <net/cfg80211.h>
  22
  23 #include "osdep_service.h"
  24 #include "drv_types.h"
  25 #include "recv_osdep.h"
  26 #include "mlme_osdep.h"
  27 #include "ethernet.h"
  28 #include "usb_ops.h"
  29 #include "wifi.h"
  30
  31 static void recv_tasklet(struct tasklet_struct *t);
  32
  33 int r8712_init_recv_priv(struct recv_priv *precvpriv,
  34                          struct _adapter *padapter)
  35 {
  36         int i;
  37         struct recv_buf *precvbuf;
  38         addr_t tmpaddr = 0;
  39         int alignment = 0;
  40         struct sk_buff *pskb = NULL;
  41
  42         /*init recv_buf*/
  43         _init_queue(&precvpriv->free_recv_buf_queue);
  44         precvpriv->pallocated_recv_buf =
  45                 kzalloc(NR_RECVBUFF * sizeof(struct recv_buf) + 4, GFP_ATOMIC);
  46         if (!precvpriv->pallocated_recv_buf)
  47                 return -ENOMEM;
  48         precvpriv->precv_buf = precvpriv->pallocated_recv_buf + 4 -
  49                               ((addr_t)(precvpriv->pallocated_recv_buf) & 3);
  50         precvbuf = (struct recv_buf *)precvpriv->precv_buf;
  51         for (i = 0; i < NR_RECVBUFF; i++) {
  52                 INIT_LIST_HEAD(&precvbuf->list);
  53                 spin_lock_init(&precvbuf->recvbuf_lock);
  54                 if (r8712_os_recvbuf_resource_alloc(padapter, precvbuf))
  55                         break;
  56                 precvbuf->ref_cnt = 0;
  57                 precvbuf->adapter = padapter;
  58                 list_add_tail(&precvbuf->list,
  59                               &precvpriv->free_recv_buf_queue.queue);
  60                 precvbuf++;
  61         }
  62         precvpriv->free_recv_buf_queue_cnt = NR_RECVBUFF;
  63         tasklet_setup(&precvpriv->recv_tasklet, recv_tasklet);
  64         skb_queue_head_init(&precvpriv->rx_skb_queue);
  65
  66         skb_queue_head_init(&precvpriv->free_recv_skb_queue);
  67         for (i = 0; i < NR_PREALLOC_RECV_SKB; i++) {
  68                 pskb = netdev_alloc_skb(padapter->pnetdev, MAX_RECVBUF_SZ +
  69                        RECVBUFF_ALIGN_SZ);
  70                 if (pskb) {
  71                         tmpaddr = (addr_t)pskb->data;
  72                         alignment = tmpaddr & (RECVBUFF_ALIGN_SZ - 1);
  73                         skb_reserve(pskb, (RECVBUFF_ALIGN_SZ - alignment));
  74                         skb_queue_tail(&precvpriv->free_recv_skb_queue, pskb);
  75                 }
  76                 pskb = NULL;
  77         }
  78         return 0;
  79 }
  80
  81 void r8712_free_recv_priv(struct recv_priv *precvpriv)
  82 {
  83         int i;
  84         struct recv_buf *precvbuf;
  85         struct _adapter *padapter = precvpriv->adapter;
  86
  87         precvbuf = (struct recv_buf *)precvpriv->precv_buf;
  88         for (i = 0; i < NR_RECVBUFF; i++) {
  89                 r8712_os_recvbuf_resource_free(padapter, precvbuf);
  90                 precvbuf++;
  91         }
  92         kfree(precvpriv->pallocated_recv_buf);
  93         skb_queue_purge(&precvpriv->rx_skb_queue);
  94         if (skb_queue_len(&precvpriv->rx_skb_queue))
  95                 netdev_warn(padapter->pnetdev, "r8712u: rx_skb_queue not empty\n");
  96         skb_queue_purge(&precvpriv->free_recv_skb_queue);
  97         if (skb_queue_len(&precvpriv->free_recv_skb_queue))
  98                 netdev_warn(padapter->pnetdev, "r8712u: free_recv_skb_queue not empty %d\n",
  99                             skb_queue_len(&precvpriv->free_recv_skb_queue));
 100 }
 101
 102 void r8712_init_recvbuf(struct _adapter *padapter, struct recv_buf *precvbuf)
 103 {
 104         precvbuf->transfer_len = 0;
 105         precvbuf->len = 0;
 106         precvbuf->ref_cnt = 0;
 107         if (precvbuf->pbuf) {
 108                 precvbuf->pdata = precvbuf->pbuf;
 109                 precvbuf->phead = precvbuf->pbuf;
 110                 precvbuf->ptail = precvbuf->pbuf;
 111                 precvbuf->pend = precvbuf->pdata + MAX_RECVBUF_SZ;
 112         }
 113 }
 114
 115 void r8712_free_recvframe(union recv_frame *precvframe,
 116                           struct  __queue *pfree_recv_queue)
 117 {
 118         unsigned long irqL;
 119         struct _adapter *padapter = precvframe->u.hdr.adapter;
 120         struct recv_priv *precvpriv = &padapter->recvpriv;
 121
 122         if (precvframe->u.hdr.pkt) {
 123                 dev_kfree_skb_any(precvframe->u.hdr.pkt);/*free skb by driver*/
 124                 precvframe->u.hdr.pkt = NULL;
 125         }
 126         spin_lock_irqsave(&pfree_recv_queue->lock, irqL);
 127         list_del_init(&precvframe->u.hdr.list);
 128         list_add_tail(&precvframe->u.hdr.list, &pfree_recv_queue->queue);
 129         if (padapter) {
 130                 if (pfree_recv_queue == &precvpriv->free_recv_queue)
 131                         precvpriv->free_recvframe_cnt++;
 132         }
 133         spin_unlock_irqrestore(&pfree_recv_queue->lock, irqL);
 134 }
 135
 136 static void update_recvframe_attrib_from_recvstat(struct rx_pkt_attrib *pattrib,
 137                                                   struct recv_stat *prxstat)
 138 {
 139         u16 drvinfo_sz;
 140
 141         drvinfo_sz = (le32_to_cpu(prxstat->rxdw0) & 0x000f0000) >> 16;
 142         drvinfo_sz <<= 3;
 143         /*TODO:
 144          * Offset 0
 145          */
 146         pattrib->bdecrypted = (le32_to_cpu(prxstat->rxdw0) & BIT(27)) == 0;
 147         pattrib->crc_err = (le32_to_cpu(prxstat->rxdw0) & BIT(14)) != 0;
 148         /*Offset 4*/
 149         /*Offset 8*/
 150         /*Offset 12*/
 151         if (le32_to_cpu(prxstat->rxdw3) & BIT(13)) {
 152                 pattrib->tcpchk_valid = 1; /* valid */
 153                 if (le32_to_cpu(prxstat->rxdw3) & BIT(11))
 154                         pattrib->tcp_chkrpt = 1; /* correct */
 155                 else
 156                         pattrib->tcp_chkrpt = 0; /* incorrect */
 157                 if (le32_to_cpu(prxstat->rxdw3) & BIT(12))
 158                         pattrib->ip_chkrpt = 1; /* correct */
 159                 else
 160                         pattrib->ip_chkrpt = 0; /* incorrect */
 161         } else {
 162                 pattrib->tcpchk_valid = 0; /* invalid */
 163         }
 164         pattrib->mcs_rate = (u8)((le32_to_cpu(prxstat->rxdw3)) & 0x3f);
 165         pattrib->htc = (u8)((le32_to_cpu(prxstat->rxdw3) >> 14) & 0x1);
 166         /*Offset 16*/
 167         /*Offset 20*/
 168         /*phy_info*/
 169 }
 170
 171 /*perform defrag*/
 172 static union recv_frame *recvframe_defrag(struct _adapter *adapter,
 173                                           struct  __queue *defrag_q)
 174 {
 175         struct list_head *plist, *phead;
 176         u8 wlanhdr_offset;
 177         u8      curfragnum;
 178         struct recv_frame_hdr *pfhdr, *pnfhdr;
 179         union recv_frame *prframe, *pnextrframe;
 180         struct  __queue *pfree_recv_queue;
 181
 182         pfree_recv_queue = &adapter->recvpriv.free_recv_queue;
 183         phead = &defrag_q->queue;
 184         plist = phead->next;
 185         prframe = container_of(plist, union recv_frame, u.list);
 186         list_del_init(&prframe->u.list);
 187         pfhdr = &prframe->u.hdr;
 188         curfragnum = 0;
 189         if (curfragnum != pfhdr->attrib.frag_num) {
 190                 /*the first fragment number must be 0
 191                  *free the whole queue
 192                  */
 193                 r8712_free_recvframe(prframe, pfree_recv_queue);
 194                 r8712_free_recvframe_queue(defrag_q, pfree_recv_queue);
 195                 return NULL;
 196         }
 197         curfragnum++;
 198         plist = &defrag_q->queue;
 199         plist = plist->next;
 200         while (!end_of_queue_search(phead, plist)) {
 201                 pnextrframe = container_of(plist, union recv_frame, u.list);
 202                 pnfhdr = &pnextrframe->u.hdr;
 203                 /*check the fragment sequence  (2nd ~n fragment frame) */
 204                 if (curfragnum != pnfhdr->attrib.frag_num) {
 205                         /* the fragment number must increase  (after decache)
 206                          * release the defrag_q & prframe
 207                          */
 208                         r8712_free_recvframe(prframe, pfree_recv_queue);
 209                         r8712_free_recvframe_queue(defrag_q, pfree_recv_queue);
 210                         return NULL;
 211                 }
 212                 curfragnum++;
 213                 /* copy the 2nd~n fragment frame's payload to the first fragment
 214                  * get the 2nd~last fragment frame's payload
 215                  */
 216                 wlanhdr_offset = pnfhdr->attrib.hdrlen + pnfhdr->attrib.iv_len;
 217                 recvframe_pull(pnextrframe, wlanhdr_offset);
 218                 /* append  to first fragment frame's tail (if privacy frame,
 219                  * pull the ICV)
 220                  */
 221                 recvframe_pull_tail(prframe, pfhdr->attrib.icv_len);
 222                 memcpy(pfhdr->rx_tail, pnfhdr->rx_data, pnfhdr->len);
 223                 recvframe_put(prframe, pnfhdr->len);
 224                 pfhdr->attrib.icv_len = pnfhdr->attrib.icv_len;
 225                 plist = plist->next;
 226         }
 227         /* free the defrag_q queue and return the prframe */
 228         r8712_free_recvframe_queue(defrag_q, pfree_recv_queue);
 229         return prframe;
 230 }
 231
 232 /* check if need to defrag, if needed queue the frame to defrag_q */
 233 union recv_frame *r8712_recvframe_chk_defrag(struct _adapter *padapter,
 234                                              union recv_frame *precv_frame)
 235 {
 236         u8      ismfrag;
 237         u8      fragnum;
 238         u8   *psta_addr;
 239         struct recv_frame_hdr *pfhdr;
 240         struct sta_info *psta;
 241         struct  sta_priv *pstapriv;
 242         struct list_head *phead;
 243         union recv_frame *prtnframe = NULL;
 244         struct  __queue *pfree_recv_queue, *pdefrag_q;
 245
 246         pstapriv = &padapter->stapriv;
 247         pfhdr = &precv_frame->u.hdr;
 248         pfree_recv_queue = &padapter->recvpriv.free_recv_queue;
 249         /* need to define struct of wlan header frame ctrl */
 250         ismfrag = pfhdr->attrib.mfrag;
 251         fragnum = pfhdr->attrib.frag_num;
 252         psta_addr = pfhdr->attrib.ta;
 253         psta = r8712_get_stainfo(pstapriv, psta_addr);
 254         if (!psta)
 255                 pdefrag_q = NULL;
 256         else
 257                 pdefrag_q = &psta->sta_recvpriv.defrag_q;
 258
 259         if ((ismfrag == 0) && (fragnum == 0))
 260                 prtnframe = precv_frame;/*isn't a fragment frame*/
 261         if (ismfrag == 1) {
 262                 /* 0~(n-1) fragment frame
 263                  * enqueue to defraf_g
 264                  */
 265                 if (pdefrag_q) {
 266                         if (fragnum == 0) {
 267                                 /*the first fragment*/
 268                                 if (!list_empty(&pdefrag_q->queue)) {
 269                                         /*free current defrag_q */
 270                                         r8712_free_recvframe_queue(pdefrag_q,
 271                                                              pfree_recv_queue);
 272                                 }
 273                         }
 274                         /* Then enqueue the 0~(n-1) fragment to the defrag_q */
 275                         phead = &pdefrag_q->queue;
 276                         list_add_tail(&pfhdr->list, phead);
 277                         prtnframe = NULL;
 278                 } else {
 279                         /* can't find this ta's defrag_queue, so free this
 280                          * recv_frame
 281                          */
 282                         r8712_free_recvframe(precv_frame, pfree_recv_queue);
 283                         prtnframe = NULL;
 284                 }
 285         }
 286         if ((ismfrag == 0) && (fragnum != 0)) {
 287                 /* the last fragment frame
 288                  * enqueue the last fragment
 289                  */
 290                 if (pdefrag_q) {
 291                         phead = &pdefrag_q->queue;
 292                         list_add_tail(&pfhdr->list, phead);
 293                         /*call recvframe_defrag to defrag*/
 294                         precv_frame = recvframe_defrag(padapter, pdefrag_q);
 295                         prtnframe = precv_frame;
 296                 } else {
 297                         /* can't find this ta's defrag_queue, so free this
 298                          *  recv_frame
 299                          */
 300                         r8712_free_recvframe(precv_frame, pfree_recv_queue);
 301                         prtnframe = NULL;
 302                 }
 303         }
 304         if (prtnframe && (prtnframe->u.hdr.attrib.privacy)) {
 305                 /* after defrag we must check tkip mic code */
 306                 if (r8712_recvframe_chkmic(padapter, prtnframe) == _FAIL) {
 307                         r8712_free_recvframe(prtnframe, pfree_recv_queue);
 308                         prtnframe = NULL;
 309                 }
 310         }
 311         return prtnframe;
 312 }
 313
 314 static void amsdu_to_msdu(struct _adapter *padapter, union recv_frame *prframe)
 315 {
 316         int     a_len, padding_len;
 317         u16     eth_type, nSubframe_Length;
 318         u8      nr_subframes, i;
 319         unsigned char *pdata;
 320         struct rx_pkt_attrib *pattrib;
 321         _pkt *sub_skb, *subframes[MAX_SUBFRAME_COUNT];
 322         struct recv_priv *precvpriv = &padapter->recvpriv;
 323         struct  __queue *pfree_recv_queue = &precvpriv->free_recv_queue;
 324
 325         nr_subframes = 0;
 326         pattrib = &prframe->u.hdr.attrib;
 327         recvframe_pull(prframe, prframe->u.hdr.attrib.hdrlen);
 328         if (prframe->u.hdr.attrib.iv_len > 0)
 329                 recvframe_pull(prframe, prframe->u.hdr.attrib.iv_len);
 330         a_len = prframe->u.hdr.len;
 331         pdata = prframe->u.hdr.rx_data;
 332         while (a_len > ETH_HLEN) {
 333                 /* Offset 12 denote 2 mac address */
 334                 nSubframe_Length = *((u16 *)(pdata + 12));
 335                 /*==m==>change the length order*/
 336                 nSubframe_Length = (nSubframe_Length >> 8) +
 337                                    (nSubframe_Length << 8);
 338                 if (a_len < (ETHERNET_HEADER_SIZE + nSubframe_Length)) {
 339                         netdev_warn(padapter->pnetdev, "r8712u: nRemain_Length is %d and nSubframe_Length is: %d\n",
 340                                     a_len, nSubframe_Length);
 341                         goto exit;
 342                 }
 343                 /* move the data point to data content */
 344                 pdata += ETH_HLEN;
 345                 a_len -= ETH_HLEN;
 346                 /* Allocate new skb for releasing to upper layer */
 347                 sub_skb = dev_alloc_skb(nSubframe_Length + 12);
 348                 if (!sub_skb)
 349                         break;
 350                 skb_reserve(sub_skb, 12);
 351                 skb_put_data(sub_skb, pdata, nSubframe_Length);
 352                 subframes[nr_subframes++] = sub_skb;
 353                 if (nr_subframes >= MAX_SUBFRAME_COUNT) {
 354                         netdev_warn(padapter->pnetdev, "r8712u: ParseSubframe(): Too many Subframes! Packets dropped!\n");
 355                         break;
 356                 }
 357                 pdata += nSubframe_Length;
 358                 a_len -= nSubframe_Length;
 359                 if (a_len != 0) {
 360                         padding_len = 4 - ((nSubframe_Length + ETH_HLEN) & 3);
 361                         if (padding_len == 4)
 362                                 padding_len = 0;
 363                         if (a_len < padding_len)
 364                                 goto exit;
 365                         pdata += padding_len;
 366                         a_len -= padding_len;
 367                 }
 368         }
 369         for (i = 0; i < nr_subframes; i++) {
 370                 sub_skb = subframes[i];
 371                 /* convert hdr + possible LLC headers into Ethernet header */
 372                 eth_type = (sub_skb->data[6] << 8) | sub_skb->data[7];
 373                 if (sub_skb->len >= 8 &&
 374                     ((!memcmp(sub_skb->data, rfc1042_header, SNAP_SIZE) &&
 375                       eth_type != ETH_P_AARP && eth_type != ETH_P_IPX) ||
 376                      !memcmp(sub_skb->data, bridge_tunnel_header, SNAP_SIZE))) {
 377                         /* remove RFC1042 or Bridge-Tunnel encapsulation and
 378                          * replace EtherType
 379                          */
 380                         skb_pull(sub_skb, SNAP_SIZE);
 381                         memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->src,
 382                                ETH_ALEN);
 383                         memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->dst,
 384                                ETH_ALEN);
 385                 } else {
 386                         __be16 len;
 387                         /* Leave Ethernet header part of hdr and full payload */
 388                         len = htons(sub_skb->len);
 389                         memcpy(skb_push(sub_skb, 2), &len, 2);
 390                         memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->src,
 391                                ETH_ALEN);
 392                         memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->dst,
 393                                ETH_ALEN);
 394                 }
 395                 /* Indicate the packets to upper layer */
 396                 if (sub_skb) {
 397                         sub_skb->protocol =
 398                                  eth_type_trans(sub_skb, padapter->pnetdev);
 399                         sub_skb->dev = padapter->pnetdev;
 400                         if ((pattrib->tcpchk_valid == 1) &&
 401                             (pattrib->tcp_chkrpt == 1)) {
 402                                 sub_skb->ip_summed = CHECKSUM_UNNECESSARY;
 403                         } else {
 404                                 sub_skb->ip_summed = CHECKSUM_NONE;
 405                         }
 406                         netif_rx(sub_skb);
 407                 }
 408         }
 409 exit:
 410         prframe->u.hdr.len = 0;
 411         r8712_free_recvframe(prframe, pfree_recv_queue);
 412 }
 413
 414 void r8712_rxcmd_event_hdl(struct _adapter *padapter, void *prxcmdbuf)
 415 {
 416         __le32 voffset;
 417         u8 *poffset;
 418         u16 cmd_len, drvinfo_sz;
 419         struct recv_stat *prxstat;
 420
 421         poffset = prxcmdbuf;
 422         voffset = *(__le32 *)poffset;
 423         prxstat = prxcmdbuf;
 424         drvinfo_sz = (le32_to_cpu(prxstat->rxdw0) & 0x000f0000) >> 16;
 425         drvinfo_sz <<= 3;
 426         poffset += RXDESC_SIZE + drvinfo_sz;
 427         do {
 428                 voffset  = *(__le32 *)poffset;
 429                 cmd_len = (u16)(le32_to_cpu(voffset) & 0xffff);
 430                 r8712_event_handle(padapter, (__le32 *)poffset);
 431                 poffset += (cmd_len + 8);/*8 bytes alignment*/
 432         } while (le32_to_cpu(voffset) & BIT(31));
 433 }
 434
 435 static int check_indicate_seq(struct recv_reorder_ctrl *preorder_ctrl,
 436                               u16 seq_num)
 437 {
 438         u8 wsize = preorder_ctrl->wsize_b;
 439         u16 wend = (preorder_ctrl->indicate_seq + wsize - 1) % 4096;
 440
 441         /* Rx Reorder initialize condition.*/
 442         if (preorder_ctrl->indicate_seq == 0xffff)
 443                 preorder_ctrl->indicate_seq = seq_num;
 444         /* Drop out the packet which SeqNum is smaller than WinStart */
 445         if (SN_LESS(seq_num, preorder_ctrl->indicate_seq))
 446                 return false;
 447         /*
 448          * Sliding window manipulation. Conditions includes:
 449          * 1. Incoming SeqNum is equal to WinStart =>Window shift 1
 450          * 2. Incoming SeqNum is larger than the WinEnd => Window shift N
 451          */
 452         if (SN_EQUAL(seq_num, preorder_ctrl->indicate_seq))
 453                 preorder_ctrl->indicate_seq = (preorder_ctrl->indicate_seq +
 454                                               1) % 4096;
 455         else if (SN_LESS(wend, seq_num)) {
 456                 if (seq_num >= (wsize - 1))
 457                         preorder_ctrl->indicate_seq = seq_num + 1 - wsize;
 458                 else
 459                         preorder_ctrl->indicate_seq = 4095 - (wsize -
 460                                                       (seq_num + 1)) + 1;
 461         }
 462         return true;
 463 }
 464
 465 static int enqueue_reorder_recvframe(struct recv_reorder_ctrl *preorder_ctrl,
 466                                      union recv_frame *prframe)
 467 {
 468         struct list_head *phead, *plist;
 469         union recv_frame *pnextrframe;
 470         struct rx_pkt_attrib *pnextattrib;
 471         struct  __queue *ppending_recvframe_queue =
 472                                         &preorder_ctrl->pending_recvframe_queue;
 473         struct rx_pkt_attrib *pattrib = &prframe->u.hdr.attrib;
 474
 475         phead = &ppending_recvframe_queue->queue;
 476         plist = phead->next;
 477         while (!end_of_queue_search(phead, plist)) {
 478                 pnextrframe = container_of(plist, union recv_frame, u.list);
 479                 pnextattrib = &pnextrframe->u.hdr.attrib;
 480
 481                 if (SN_EQUAL(pnextattrib->seq_num, pattrib->seq_num))
 482                         return false;
 483
 484                 if (SN_LESS(pnextattrib->seq_num, pattrib->seq_num))
 485                         plist = plist->next;
 486                 else
 487                         break;
 488         }
 489         list_del_init(&prframe->u.hdr.list);
 490         list_add_tail(&prframe->u.hdr.list, plist);
 491         return true;
 492 }
 493
 494 int r8712_recv_indicatepkts_in_order(struct _adapter *padapter,
 495                                      struct recv_reorder_ctrl *preorder_ctrl,
 496                                      int bforced)
 497 {
 498         struct list_head *phead, *plist;
 499         union recv_frame *prframe;
 500         struct rx_pkt_attrib *pattrib;
 501         int bPktInBuf = false;
 502         struct  __queue *ppending_recvframe_queue =
 503                          &preorder_ctrl->pending_recvframe_queue;
 504
 505         phead = &ppending_recvframe_queue->queue;
 506         plist = phead->next;
 507         /* Handling some condition for forced indicate case.*/
 508         if (bforced) {
 509                 if (list_empty(phead))
 510                         return true;
 511
 512                 prframe = container_of(plist, union recv_frame, u.list);
 513                 pattrib = &prframe->u.hdr.attrib;
 514                 preorder_ctrl->indicate_seq = pattrib->seq_num;
 515         }
 516         /* Prepare indication list and indication.
 517          * Check if there is any packet need indicate.
 518          */
 519         while (!list_empty(phead)) {
 520                 prframe = container_of(plist, union recv_frame, u.list);
 521                 pattrib = &prframe->u.hdr.attrib;
 522                 if (!SN_LESS(preorder_ctrl->indicate_seq, pattrib->seq_num)) {
 523                         plist = plist->next;
 524                         list_del_init(&prframe->u.hdr.list);
 525                         if (SN_EQUAL(preorder_ctrl->indicate_seq,
 526                                      pattrib->seq_num))
 527                                 preorder_ctrl->indicate_seq =
 528                                   (preorder_ctrl->indicate_seq + 1) % 4096;
 529                         /*indicate this recv_frame*/
 530                         if (!pattrib->amsdu) {
 531                                 if (!padapter->driver_stopped &&
 532                                     !padapter->surprise_removed) {
 533                                         /* indicate this recv_frame */
 534                                         r8712_recv_indicatepkt(padapter,
 535                                                                prframe);
 536                                 }
 537                         } else if (pattrib->amsdu == 1) {
 538                                 amsdu_to_msdu(padapter, prframe);
 539                         }
 540                         /* Update local variables. */
 541                         bPktInBuf = false;
 542                 } else {
 543                         bPktInBuf = true;
 544                         break;
 545                 }
 546         }
 547         return bPktInBuf;
 548 }
 549
 550 static int recv_indicatepkt_reorder(struct _adapter *padapter,
 551                                     union recv_frame *prframe)
 552 {
 553         unsigned long irql;
 554         struct rx_pkt_attrib *pattrib = &prframe->u.hdr.attrib;
 555         struct recv_reorder_ctrl *preorder_ctrl = prframe->u.hdr.preorder_ctrl;
 556         struct  __queue *ppending_recvframe_queue =
 557                          &preorder_ctrl->pending_recvframe_queue;
 558
 559         if (!pattrib->amsdu) {
 560                 /* s1. */
 561                 r8712_wlanhdr_to_ethhdr(prframe);
 562                 if (pattrib->qos != 1) {
 563                         if (!padapter->driver_stopped &&
 564                             !padapter->surprise_removed) {
 565                                 r8712_recv_indicatepkt(padapter, prframe);
 566                                 return 0;
 567                         } else {
 568                                 return -EINVAL;
 569                         }
 570                 }
 571         }
 572         spin_lock_irqsave(&ppending_recvframe_queue->lock, irql);
 573         /*s2. check if winstart_b(indicate_seq) needs to be updated*/
 574         if (!check_indicate_seq(preorder_ctrl, pattrib->seq_num))
 575                 goto _err_exit;
 576         /*s3. Insert all packet into Reorder Queue to maintain its ordering.*/
 577         if (!enqueue_reorder_recvframe(preorder_ctrl, prframe))
 578                 goto _err_exit;
 579         /*s4.
 580          * Indication process.
 581          * After Packet dropping and Sliding Window shifting as above, we can
 582          * now just indicate the packets with the SeqNum smaller than latest
 583          * WinStart and buffer other packets.
 584          *
 585          * For Rx Reorder condition:
 586          * 1. All packets with SeqNum smaller than WinStart => Indicate
 587          * 2. All packets with SeqNum larger than or equal to
 588          * WinStart => Buffer it.
 589          */
 590         if (r8712_recv_indicatepkts_in_order(padapter, preorder_ctrl, false)) {
 591                 mod_timer(&preorder_ctrl->reordering_ctrl_timer,
 592                           jiffies + msecs_to_jiffies(REORDER_WAIT_TIME));
 593                 spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
 594         } else {
 595                 spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
 596                 del_timer(&preorder_ctrl->reordering_ctrl_timer);
 597         }
 598         return 0;
 599 _err_exit:
 600         spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
 601         return -ENOMEM;
 602 }
 603
 604 void r8712_reordering_ctrl_timeout_handler(void *pcontext)
 605 {
 606         unsigned long irql;
 607         struct recv_reorder_ctrl *preorder_ctrl = pcontext;
 608         struct _adapter *padapter = preorder_ctrl->padapter;
 609         struct  __queue *ppending_recvframe_queue =
 610                                  &preorder_ctrl->pending_recvframe_queue;
 611
 612         if (padapter->driver_stopped || padapter->surprise_removed)
 613                 return;
 614         spin_lock_irqsave(&ppending_recvframe_queue->lock, irql);
 615         r8712_recv_indicatepkts_in_order(padapter, preorder_ctrl, true);
 616         spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
 617 }
 618
 619 static int r8712_process_recv_indicatepkts(struct _adapter *padapter,
 620                                            union recv_frame *prframe)
 621 {
 622         int retval = _SUCCESS;
 623         struct mlme_priv *pmlmepriv = &padapter->mlmepriv;
 624         struct ht_priv  *phtpriv = &pmlmepriv->htpriv;
 625
 626         if (phtpriv->ht_option == 1) { /*B/G/N Mode*/
 627                 if (recv_indicatepkt_reorder(padapter, prframe)) {
 628                         /* including perform A-MPDU Rx Ordering Buffer Control*/
 629                         if (!padapter->driver_stopped &&
 630                             !padapter->surprise_removed)
 631                                 return _FAIL;
 632                 }
 633         } else { /*B/G mode*/
 634                 retval = r8712_wlanhdr_to_ethhdr(prframe);
 635                 if (retval)
 636                         return _FAIL;
 637                 if (!padapter->driver_stopped && !padapter->surprise_removed) {
 638                         /* indicate this recv_frame */
 639                         r8712_recv_indicatepkt(padapter, prframe);
 640                 } else {
 641                         return _FAIL;
 642                 }
 643         }
 644         return retval;
 645 }
 646
 647 static u8 query_rx_pwr_percentage(s8 antpower)
 648 {
 649         if ((antpower <= -100) || (antpower >= 20))
 650                 return  0;
 651         else if (antpower >= 0)
 652                 return  100;
 653         else
 654                 return 100 + antpower;
 655 }
 656
 657 static u8 evm_db2percentage(s8 value)
 658 {
 659         /*
 660          * -33dB~0dB to 0%~99%
 661          */
 662         s8 ret_val = clamp(-value, 0, 33) * 3;
 663
 664         if (ret_val == 99)
 665                 ret_val = 100;
 666
 667         return ret_val;
 668 }
 669
 670 s32 r8712_signal_scale_mapping(s32 cur_sig)
 671 {
 672         s32 ret_sig;
 673
 674         if (cur_sig >= 51 && cur_sig <= 100)
 675                 ret_sig = 100;
 676         else if (cur_sig >= 41 && cur_sig <= 50)
 677                 ret_sig = 80 + ((cur_sig - 40) * 2);
 678         else if (cur_sig >= 31 && cur_sig <= 40)
 679                 ret_sig = 66 + (cur_sig - 30);
 680         else if (cur_sig >= 21 && cur_sig <= 30)
 681                 ret_sig = 54 + (cur_sig - 20);
 682         else if (cur_sig >= 10 && cur_sig <= 20)
 683                 ret_sig = 42 + (((cur_sig - 10) * 2) / 3);
 684         else if (cur_sig >= 5 && cur_sig <= 9)
 685                 ret_sig = 22 + (((cur_sig - 5) * 3) / 2);
 686         else if (cur_sig >= 1 && cur_sig <= 4)
 687                 ret_sig = 6 + (((cur_sig - 1) * 3) / 2);
 688         else
 689                 ret_sig = cur_sig;
 690         return ret_sig;
 691 }
 692
 693 static s32  translate2dbm(struct _adapter *padapter, u8 signal_strength_idx)
 694 {
 695         s32 signal_power; /* in dBm.*/
 696         /* Translate to dBm (x=0.5y-95).*/
 697         signal_power = (s32)((signal_strength_idx + 1) >> 1);
 698         signal_power -= 95;
 699         return signal_power;
 700 }
 701
 702 static void query_rx_phy_status(struct _adapter *padapter,
 703                                 union recv_frame *prframe)
 704 {
 705         u8 i, max_spatial_stream, evm;
 706         struct recv_stat *prxstat = (struct recv_stat *)prframe->u.hdr.rx_head;
 707         struct phy_stat *pphy_stat = (struct phy_stat *)(prxstat + 1);
 708         u8 *pphy_head = (u8 *)(prxstat + 1);
 709         s8 rx_pwr[4], rx_pwr_all;
 710         u8 pwdb_all;
 711         u32 rssi, total_rssi = 0;
 712         u8 bcck_rate = 0, rf_rx_num = 0, cck_highpwr = 0;
 713         struct phy_cck_rx_status *pcck_buf;
 714         u8 sq;
 715
 716         /* Record it for next packet processing*/
 717         bcck_rate = (prframe->u.hdr.attrib.mcs_rate <= 3 ? 1 : 0);
 718         if (bcck_rate) {
 719                 u8 report;
 720
 721                 /* CCK Driver info Structure is not the same as OFDM packet.*/
 722                 pcck_buf = (struct phy_cck_rx_status *)pphy_stat;
 723                 /* (1)Hardware does not provide RSSI for CCK
 724                  * (2)PWDB, Average PWDB calculated by hardware
 725                  * (for rate adaptive)
 726                  */
 727                 if (!cck_highpwr) {
 728                         report = pcck_buf->cck_agc_rpt & 0xc0;
 729                         report >>= 6;
 730                         switch (report) {
 731                         /* Modify the RF RNA gain value to -40, -20,
 732                          * -2, 14 by Jenyu's suggestion
 733                          * Note: different RF with the different
 734                          * RNA gain.
 735                          */
 736                         case 0x3:
 737                                 rx_pwr_all = -40 - (pcck_buf->cck_agc_rpt &
 738                                              0x3e);
 739                                 break;
 740                         case 0x2:
 741                                 rx_pwr_all = -20 - (pcck_buf->cck_agc_rpt &
 742                                              0x3e);
 743                                 break;
 744                         case 0x1:
 745                                 rx_pwr_all = -2 - (pcck_buf->cck_agc_rpt &
 746                                              0x3e);
 747                                 break;
 748                         case 0x0:
 749                                 rx_pwr_all = 14 - (pcck_buf->cck_agc_rpt &
 750                                              0x3e);
 751                                 break;
 752                         }
 753                 } else {
 754                         report = ((u8)(le32_to_cpu(pphy_stat->phydw1) >> 8)) &
 755                                  0x60;
 756                         report >>= 5;
 757                         switch (report) {
 758                         case 0x3:
 759                                 rx_pwr_all = -40 - ((pcck_buf->cck_agc_rpt &
 760                                              0x1f) << 1);
 761                                 break;
 762                         case 0x2:
 763                                 rx_pwr_all = -20 - ((pcck_buf->cck_agc_rpt &
 764                                              0x1f) << 1);
 765                                 break;
 766                         case 0x1:
 767                                 rx_pwr_all = -2 - ((pcck_buf->cck_agc_rpt &
 768                                              0x1f) << 1);
 769                                 break;
 770                         case 0x0:
 771                                 rx_pwr_all = 14 - ((pcck_buf->cck_agc_rpt &
 772                                              0x1f) << 1);
 773                                 break;
 774                         }
 775                 }
 776                 pwdb_all = query_rx_pwr_percentage(rx_pwr_all);
 777                 /* CCK gain is smaller than OFDM/MCS gain,*/
 778                 /* so we add gain diff by experiences, the val is 6 */
 779                 pwdb_all += 6;
 780                 if (pwdb_all > 100)
 781                         pwdb_all = 100;
 782                 /* modify the offset to make the same gain index with OFDM.*/
 783                 if (pwdb_all > 34 && pwdb_all <= 42)
 784                         pwdb_all -= 2;
 785                 else if (pwdb_all > 26 && pwdb_all <= 34)
 786                         pwdb_all -= 6;
 787                 else if (pwdb_all > 14 && pwdb_all <= 26)
 788                         pwdb_all -= 8;
 789                 else if (pwdb_all > 4 && pwdb_all <= 14)
 790                         pwdb_all -= 4;
 791                 /*
 792                  * (3) Get Signal Quality (EVM)
 793                  */
 794                 if (pwdb_all > 40) {
 795                         sq = 100;
 796                 } else {
 797                         sq = pcck_buf->sq_rpt;
 798                         if (pcck_buf->sq_rpt > 64)
 799                                 sq = 0;
 800                         else if (pcck_buf->sq_rpt < 20)
 801                                 sq = 100;
 802                         else
 803                                 sq = ((64 - sq) * 100) / 44;
 804                 }
 805                 prframe->u.hdr.attrib.signal_qual = sq;
 806                 prframe->u.hdr.attrib.rx_mimo_signal_qual[0] = sq;
 807                 prframe->u.hdr.attrib.rx_mimo_signal_qual[1] = -1;
 808         } else {
 809                 /* (1)Get RSSI for HT rate */
 810                 for (i = 0; i < ((padapter->registrypriv.rf_config) &
 811                             0x0f); i++) {
 812                         rf_rx_num++;
 813                         rx_pwr[i] = ((pphy_head[PHY_STAT_GAIN_TRSW_SHT + i]
 814                                     & 0x3F) * 2) - 110;
 815                         /* Translate DBM to percentage. */
 816                         rssi = query_rx_pwr_percentage(rx_pwr[i]);
 817                         total_rssi += rssi;
 818                 }
 819                 /* (2)PWDB, Average PWDB calculated by hardware (for
 820                  * rate adaptive)
 821                  */
 822                 rx_pwr_all = (((pphy_head[PHY_STAT_PWDB_ALL_SHT]) >> 1) & 0x7f)
 823                              - 106;
 824                 pwdb_all = query_rx_pwr_percentage(rx_pwr_all);
 825
 826                 {
 827                         /* (3)EVM of HT rate */
 828                         if (prframe->u.hdr.attrib.htc &&
 829                             prframe->u.hdr.attrib.mcs_rate >= 20 &&
 830                             prframe->u.hdr.attrib.mcs_rate <= 27) {
 831                                 /* both spatial stream make sense */
 832                                 max_spatial_stream = 2;
 833                         } else {
 834                                 /* only spatial stream 1 makes sense */
 835                                 max_spatial_stream = 1;
 836                         }
 837                         for (i = 0; i < max_spatial_stream; i++) {
 838                                 evm = evm_db2percentage((pphy_head
 839                                       [PHY_STAT_RXEVM_SHT + i]));/*dbm*/
 840                                 prframe->u.hdr.attrib.signal_qual =
 841                                          (u8)(evm & 0xff);
 842                                 prframe->u.hdr.attrib.rx_mimo_signal_qual[i] =
 843                                          (u8)(evm & 0xff);
 844                         }
 845                 }
 846         }
 847         /* UI BSS List signal strength(in percentage), make it good looking,
 848          * from 0~100. It is assigned to the BSS List in
 849          * GetValueFromBeaconOrProbeRsp().
 850          */
 851         if (bcck_rate) {
 852                 prframe->u.hdr.attrib.signal_strength =
 853                          (u8)r8712_signal_scale_mapping(pwdb_all);
 854         } else {
 855                 if (rf_rx_num != 0)
 856                         prframe->u.hdr.attrib.signal_strength =
 857                                  (u8)(r8712_signal_scale_mapping(total_rssi /=
 858                                  rf_rx_num));
 859         }
 860 }
 861
 862 static void process_link_qual(struct _adapter *padapter,
 863                               union recv_frame *prframe)
 864 {
 865         u32     last_evm = 0, tmpVal;
 866         struct rx_pkt_attrib *pattrib;
 867         struct smooth_rssi_data *sqd = &padapter->recvpriv.signal_qual_data;
 868
 869         if (!prframe || !padapter)
 870                 return;
 871         pattrib = &prframe->u.hdr.attrib;
 872         if (pattrib->signal_qual != 0) {
 873                 /*
 874                  * 1. Record the general EVM to the sliding window.
 875                  */
 876                 if (sqd->total_num++ >= PHY_LINKQUALITY_SLID_WIN_MAX) {
 877                         sqd->total_num = PHY_LINKQUALITY_SLID_WIN_MAX;
 878                         last_evm = sqd->elements[sqd->index];
 879                         sqd->total_val -= last_evm;
 880                 }
 881                 sqd->total_val += pattrib->signal_qual;
 882                 sqd->elements[sqd->index++] = pattrib->signal_qual;
 883                 if (sqd->index >= PHY_LINKQUALITY_SLID_WIN_MAX)
 884                         sqd->index = 0;
 885
 886                 /* <1> Showed on UI for user, in percentage. */
 887                 tmpVal = sqd->total_val / sqd->total_num;
 888                 padapter->recvpriv.signal = (u8)tmpVal;
 889         }
 890 }
 891
 892 static void process_rssi(struct _adapter *padapter, union recv_frame *prframe)
 893 {
 894         u32 last_rssi, tmp_val;
 895         struct rx_pkt_attrib *pattrib = &prframe->u.hdr.attrib;
 896         struct smooth_rssi_data *ssd = &padapter->recvpriv.signal_strength_data;
 897
 898         if (ssd->total_num++ >= PHY_RSSI_SLID_WIN_MAX) {
 899                 ssd->total_num = PHY_RSSI_SLID_WIN_MAX;
 900                 last_rssi = ssd->elements[ssd->index];
 901                 ssd->total_val -= last_rssi;
 902         }
 903         ssd->total_val += pattrib->signal_strength;
 904         ssd->elements[ssd->index++] = pattrib->signal_strength;
 905         if (ssd->index >= PHY_RSSI_SLID_WIN_MAX)
 906                 ssd->index = 0;
 907         tmp_val = ssd->total_val / ssd->total_num;
 908         padapter->recvpriv.rssi = (s8)translate2dbm(padapter, (u8)tmp_val);
 909 }
 910
 911 static void process_phy_info(struct _adapter *padapter,
 912                              union recv_frame *prframe)
 913 {
 914         query_rx_phy_status(padapter, prframe);
 915         process_rssi(padapter, prframe);
 916         process_link_qual(padapter,  prframe);
 917 }
 918
 919 int recv_func(struct _adapter *padapter, void *pcontext)
 920 {
 921         struct rx_pkt_attrib *pattrib;
 922         union recv_frame *prframe, *orig_prframe;
 923         int retval = _SUCCESS;
 924         struct  __queue *pfree_recv_queue = &padapter->recvpriv.free_recv_queue;
 925         struct  mlme_priv       *pmlmepriv = &padapter->mlmepriv;
 926
 927         prframe = pcontext;
 928         orig_prframe = prframe;
 929         pattrib = &prframe->u.hdr.attrib;
 930         if (check_fwstate(pmlmepriv, WIFI_MP_STATE)) {
 931                 if (pattrib->crc_err == 1)
 932                         padapter->mppriv.rx_crcerrpktcount++;
 933                 else
 934                         padapter->mppriv.rx_pktcount++;
 935                 if (!check_fwstate(pmlmepriv, WIFI_MP_LPBK_STATE)) {
 936                         /* free this recv_frame */
 937                         r8712_free_recvframe(orig_prframe, pfree_recv_queue);
 938                         goto _exit_recv_func;
 939                 }
 940         }
 941         /* check the frame crtl field and decache */
 942         retval = r8712_validate_recv_frame(padapter, prframe);
 943         if (retval != _SUCCESS) {
 944                 /* free this recv_frame */
 945                 r8712_free_recvframe(orig_prframe, pfree_recv_queue);
 946                 goto _exit_recv_func;
 947         }
 948         process_phy_info(padapter, prframe);
 949         prframe = r8712_decryptor(padapter, prframe);
 950         if (!prframe) {
 951                 retval = _FAIL;
 952                 goto _exit_recv_func;
 953         }
 954         prframe = r8712_recvframe_chk_defrag(padapter, prframe);
 955         if (!prframe)
 956                 goto _exit_recv_func;
 957         prframe = r8712_portctrl(padapter, prframe);
 958         if (!prframe) {
 959                 retval = _FAIL;
 960                 goto _exit_recv_func;
 961         }
 962         retval = r8712_process_recv_indicatepkts(padapter, prframe);
 963         if (retval != _SUCCESS) {
 964                 r8712_free_recvframe(orig_prframe, pfree_recv_queue);
 965                 goto _exit_recv_func;
 966         }
 967 _exit_recv_func:
 968         return retval;
 969 }
 970
 971 static void recvbuf2recvframe(struct _adapter *padapter, struct sk_buff *pskb)
 972 {
 973         u8 *pbuf, shift_sz = 0;
 974         u8      frag, mf;
 975         uint    pkt_len;
 976         u32 transfer_len;
 977         struct recv_stat *prxstat;
 978         u16     pkt_cnt, drvinfo_sz, pkt_offset, tmp_len, alloc_sz;
 979         struct  __queue *pfree_recv_queue;
 980         _pkt  *pkt_copy = NULL;
 981         union recv_frame *precvframe = NULL;
 982         struct recv_priv *precvpriv = &padapter->recvpriv;
 983
 984         pfree_recv_queue = &precvpriv->free_recv_queue;
 985         pbuf = pskb->data;
 986         prxstat = (struct recv_stat *)pbuf;
 987         pkt_cnt = (le32_to_cpu(prxstat->rxdw2) >> 16) & 0xff;
 988         pkt_len =  le32_to_cpu(prxstat->rxdw0) & 0x00003fff;
 989         transfer_len = pskb->len;
 990         /* Test throughput with Netgear 3700 (No security) with Chariot 3T3R
 991          * pairs. The packet count will be a big number so that the containing
 992          * packet will effect the Rx reordering.
 993          */
 994         if (transfer_len < pkt_len) {
 995                 /* In this case, it means the MAX_RECVBUF_SZ is too small to
 996                  * get the data from 8712u.
 997                  */
 998                 return;
 999         }
1000         do {
1001                 prxstat = (struct recv_stat *)pbuf;
1002                 pkt_len =  le32_to_cpu(prxstat->rxdw0) & 0x00003fff;
1003                 /* more fragment bit */
1004                 mf = (le32_to_cpu(prxstat->rxdw1) >> 27) & 0x1;
1005                 /* ragmentation number */
1006                 frag = (le32_to_cpu(prxstat->rxdw2) >> 12) & 0xf;
1007                 /* uint 2^3 = 8 bytes */
1008                 drvinfo_sz = (le32_to_cpu(prxstat->rxdw0) & 0x000f0000) >> 16;
1009                 drvinfo_sz <<= 3;
1010                 if (pkt_len <= 0)
1011                         return;
1012                 /* Qos data, wireless lan header length is 26 */
1013                 if ((le32_to_cpu(prxstat->rxdw0) >> 23) & 0x01)
1014                         shift_sz = 2;
1015                 precvframe = r8712_alloc_recvframe(pfree_recv_queue);
1016                 if (!precvframe)
1017                         return;
1018                 INIT_LIST_HEAD(&precvframe->u.hdr.list);
1019                 precvframe->u.hdr.precvbuf = NULL; /*can't access the precvbuf*/
1020                 precvframe->u.hdr.len = 0;
1021                 tmp_len = pkt_len + drvinfo_sz + RXDESC_SIZE;
1022                 pkt_offset = (u16)round_up(tmp_len, 128);
1023                 /* for first fragment packet, driver need allocate 1536 +
1024                  * drvinfo_sz + RXDESC_SIZE to defrag packet.
1025                  */
1026                 if ((mf == 1) && (frag == 0))
1027                         /*1658+6=1664, 1664 is 128 alignment.*/
1028                         alloc_sz = max_t(u16, tmp_len, 1658);
1029                 else
1030                         alloc_sz = tmp_len;
1031                 /* 2 is for IP header 4 bytes alignment in QoS packet case.
1032                  * 4 is for skb->data 4 bytes alignment.
1033                  */
1034                 alloc_sz += 6;
1035                 pkt_copy = netdev_alloc_skb(padapter->pnetdev, alloc_sz);
1036                 if (!pkt_copy)
1037                         return;
1038
1039                 precvframe->u.hdr.pkt = pkt_copy;
1040                 skb_reserve(pkt_copy, 4 - ((addr_t)(pkt_copy->data) % 4));
1041                 skb_reserve(pkt_copy, shift_sz);
1042                 memcpy(pkt_copy->data, pbuf, tmp_len);
1043                 precvframe->u.hdr.rx_head = pkt_copy->data;
1044                 precvframe->u.hdr.rx_data = pkt_copy->data;
1045                 precvframe->u.hdr.rx_tail = pkt_copy->data;
1046                 precvframe->u.hdr.rx_end = pkt_copy->data + alloc_sz;
1047
1048                 recvframe_put(precvframe, tmp_len);
1049                 recvframe_pull(precvframe, drvinfo_sz + RXDESC_SIZE);
1050                 /* because the endian issue, driver avoid reference to the
1051                  * rxstat after calling update_recvframe_attrib_from_recvstat();
1052                  */
1053                 update_recvframe_attrib_from_recvstat(&precvframe->u.hdr.attrib,
1054                                                       prxstat);
1055                 r8712_recv_entry(precvframe);
1056                 transfer_len -= pkt_offset;
1057                 pbuf += pkt_offset;
1058                 pkt_cnt--;
1059                 precvframe = NULL;
1060                 pkt_copy = NULL;
1061         } while ((transfer_len > 0) && pkt_cnt > 0);
1062 }
1063
1064 static void recv_tasklet(struct tasklet_struct *t)
1065 {
1066         struct sk_buff *pskb;
1067         struct _adapter *padapter = from_tasklet(padapter, t,
1068                                                  recvpriv.recv_tasklet);
1069         struct recv_priv *precvpriv = &padapter->recvpriv;
1070
1071         while (NULL != (pskb = skb_dequeue(&precvpriv->rx_skb_queue))) {
1072                 recvbuf2recvframe(padapter, pskb);
1073                 skb_reset_tail_pointer(pskb);
1074                 pskb->len = 0;
1075                 if (!skb_cloned(pskb))
1076                         skb_queue_tail(&precvpriv->free_recv_skb_queue, pskb);
1077                 else
1078                         consume_skb(pskb);
1079         }
1080 }