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
  22 #include "osdep_service.h"
  23 #include "drv_types.h"
  24 #include "recv_osdep.h"
  25 #include "mlme_osdep.h"
  26 #include "ethernet.h"
  27 #include "usb_ops.h"
  28 #include "wifi.h"
  29
  30 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
  31 static u8 bridge_tunnel_header[] = {0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8};
  32
  33 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
  34 static u8 rfc1042_header[] = {0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00};
  35
  36 static void recv_tasklet(unsigned long priv);
  37
  38 void r8712_init_recv_priv(struct recv_priv *precvpriv,
  39                           struct _adapter *padapter)
  40 {
  41         int i;
  42         struct recv_buf *precvbuf;
  43         addr_t tmpaddr = 0;
  44         int alignment = 0;
  45         struct sk_buff *pskb = NULL;
  46
  47         /*init recv_buf*/
  48         _init_queue(&precvpriv->free_recv_buf_queue);
  49         precvpriv->pallocated_recv_buf =
  50                 kzalloc(NR_RECVBUFF * sizeof(struct recv_buf) + 4, GFP_ATOMIC);
  51         if (!precvpriv->pallocated_recv_buf)
  52                 return;
  53         precvpriv->precv_buf = precvpriv->pallocated_recv_buf + 4 -
  54                               ((addr_t)(precvpriv->pallocated_recv_buf) & 3);
  55         precvbuf = (struct recv_buf *)precvpriv->precv_buf;
  56         for (i = 0; i < NR_RECVBUFF; i++) {
  57                 INIT_LIST_HEAD(&precvbuf->list);
  58                 spin_lock_init(&precvbuf->recvbuf_lock);
  59                 if (r8712_os_recvbuf_resource_alloc(padapter, precvbuf))
  60                         break;
  61                 precvbuf->ref_cnt = 0;
  62                 precvbuf->adapter = padapter;
  63                 list_add_tail(&precvbuf->list,
  64                               &(precvpriv->free_recv_buf_queue.queue));
  65                 precvbuf++;
  66         }
  67         precvpriv->free_recv_buf_queue_cnt = NR_RECVBUFF;
  68         tasklet_init(&precvpriv->recv_tasklet, recv_tasklet,
  69                      (unsigned long)padapter);
  70         skb_queue_head_init(&precvpriv->rx_skb_queue);
  71
  72         skb_queue_head_init(&precvpriv->free_recv_skb_queue);
  73         for (i = 0; i < NR_PREALLOC_RECV_SKB; i++) {
  74                 pskb = netdev_alloc_skb(padapter->pnetdev, MAX_RECVBUF_SZ +
  75                        RECVBUFF_ALIGN_SZ);
  76                 if (pskb) {
  77                         tmpaddr = (addr_t)pskb->data;
  78                         alignment = tmpaddr & (RECVBUFF_ALIGN_SZ - 1);
  79                         skb_reserve(pskb, (RECVBUFF_ALIGN_SZ - alignment));
  80                         skb_queue_tail(&precvpriv->free_recv_skb_queue, pskb);
  81                 }
  82                 pskb = NULL;
  83         }
  84 }
  85
  86 void r8712_free_recv_priv(struct recv_priv *precvpriv)
  87 {
  88         int i;
  89         struct recv_buf *precvbuf;
  90         struct _adapter *padapter = precvpriv->adapter;
  91
  92         precvbuf = (struct recv_buf *)precvpriv->precv_buf;
  93         for (i = 0; i < NR_RECVBUFF; i++) {
  94                 r8712_os_recvbuf_resource_free(padapter, precvbuf);
  95                 precvbuf++;
  96         }
  97         kfree(precvpriv->pallocated_recv_buf);
  98         skb_queue_purge(&precvpriv->rx_skb_queue);
  99         if (skb_queue_len(&precvpriv->rx_skb_queue))
 100                 netdev_warn(padapter->pnetdev, "r8712u: rx_skb_queue not empty\n");
 101         skb_queue_purge(&precvpriv->free_recv_skb_queue);
 102         if (skb_queue_len(&precvpriv->free_recv_skb_queue))
 103                 netdev_warn(padapter->pnetdev, "r8712u: free_recv_skb_queue not empty %d\n",
 104                             skb_queue_len(&precvpriv->free_recv_skb_queue));
 105 }
 106
 107 void r8712_init_recvbuf(struct _adapter *padapter, struct recv_buf *precvbuf)
 108 {
 109         precvbuf->transfer_len = 0;
 110         precvbuf->len = 0;
 111         precvbuf->ref_cnt = 0;
 112         if (precvbuf->pbuf) {
 113                 precvbuf->pdata = precvbuf->pbuf;
 114                 precvbuf->phead = precvbuf->pbuf;
 115                 precvbuf->ptail = precvbuf->pbuf;
 116                 precvbuf->pend = precvbuf->pdata + MAX_RECVBUF_SZ;
 117         }
 118 }
 119
 120 void r8712_free_recvframe(union recv_frame *precvframe,
 121                           struct  __queue *pfree_recv_queue)
 122 {
 123         unsigned long irqL;
 124         struct _adapter *padapter = precvframe->u.hdr.adapter;
 125         struct recv_priv *precvpriv = &padapter->recvpriv;
 126
 127         if (precvframe->u.hdr.pkt) {
 128                 dev_kfree_skb_any(precvframe->u.hdr.pkt);/*free skb by driver*/
 129                 precvframe->u.hdr.pkt = NULL;
 130         }
 131         spin_lock_irqsave(&pfree_recv_queue->lock, irqL);
 132         list_del_init(&(precvframe->u.hdr.list));
 133         list_add_tail(&(precvframe->u.hdr.list), &pfree_recv_queue->queue);
 134         if (padapter) {
 135                 if (pfree_recv_queue == &precvpriv->free_recv_queue)
 136                         precvpriv->free_recvframe_cnt++;
 137         }
 138         spin_unlock_irqrestore(&pfree_recv_queue->lock, irqL);
 139 }
 140
 141 static void update_recvframe_attrib_from_recvstat(struct rx_pkt_attrib *pattrib,
 142                                                   struct recv_stat *prxstat)
 143 {
 144         u16 drvinfo_sz;
 145
 146         drvinfo_sz = (le32_to_cpu(prxstat->rxdw0) & 0x000f0000) >> 16;
 147         drvinfo_sz <<= 3;
 148         /*TODO:
 149          * Offset 0
 150          */
 151         pattrib->bdecrypted = ((le32_to_cpu(prxstat->rxdw0) & BIT(27)) >> 27)
 152                                  ? 0 : 1;
 153         pattrib->crc_err = (le32_to_cpu(prxstat->rxdw0) & BIT(14)) >> 14;
 154         /*Offset 4*/
 155         /*Offset 8*/
 156         /*Offset 12*/
 157         if (le32_to_cpu(prxstat->rxdw3) & BIT(13)) {
 158                 pattrib->tcpchk_valid = 1; /* valid */
 159                 if (le32_to_cpu(prxstat->rxdw3) & BIT(11))
 160                         pattrib->tcp_chkrpt = 1; /* correct */
 161                 else
 162                         pattrib->tcp_chkrpt = 0; /* incorrect */
 163                 if (le32_to_cpu(prxstat->rxdw3) & BIT(12))
 164                         pattrib->ip_chkrpt = 1; /* correct */
 165                 else
 166                         pattrib->ip_chkrpt = 0; /* incorrect */
 167         } else {
 168                 pattrib->tcpchk_valid = 0; /* invalid */
 169         }
 170         pattrib->mcs_rate = (u8)((le32_to_cpu(prxstat->rxdw3)) & 0x3f);
 171         pattrib->htc = (u8)((le32_to_cpu(prxstat->rxdw3) >> 14) & 0x1);
 172         /*Offset 16*/
 173         /*Offset 20*/
 174         /*phy_info*/
 175 }
 176
 177 /*perform defrag*/
 178 static union recv_frame *recvframe_defrag(struct _adapter *adapter,
 179                                           struct  __queue *defrag_q)
 180 {
 181         struct list_head *plist, *phead;
 182         u8 wlanhdr_offset;
 183         u8      curfragnum;
 184         struct recv_frame_hdr *pfhdr, *pnfhdr;
 185         union recv_frame *prframe, *pnextrframe;
 186         struct  __queue *pfree_recv_queue;
 187
 188         pfree_recv_queue = &adapter->recvpriv.free_recv_queue;
 189         phead = &defrag_q->queue;
 190         plist = phead->next;
 191         prframe = container_of(plist, union recv_frame, u.list);
 192         list_del_init(&prframe->u.list);
 193         pfhdr = &prframe->u.hdr;
 194         curfragnum = 0;
 195         if (curfragnum != pfhdr->attrib.frag_num) {
 196                 /*the first fragment number must be 0
 197                  *free the whole queue
 198                  */
 199                 r8712_free_recvframe(prframe, pfree_recv_queue);
 200                 r8712_free_recvframe_queue(defrag_q, pfree_recv_queue);
 201                 return NULL;
 202         }
 203         curfragnum++;
 204         plist = &defrag_q->queue;
 205         plist = plist->next;
 206         while (!end_of_queue_search(phead, plist)) {
 207                 pnextrframe = container_of(plist, union recv_frame, u.list);
 208                 pnfhdr = &pnextrframe->u.hdr;
 209                 /*check the fragment sequence  (2nd ~n fragment frame) */
 210                 if (curfragnum != pnfhdr->attrib.frag_num) {
 211                         /* the fragment number must increase  (after decache)
 212                          * release the defrag_q & prframe
 213                          */
 214                         r8712_free_recvframe(prframe, pfree_recv_queue);
 215                         r8712_free_recvframe_queue(defrag_q, pfree_recv_queue);
 216                         return NULL;
 217                 }
 218                 curfragnum++;
 219                 /* copy the 2nd~n fragment frame's payload to the first fragment
 220                  * get the 2nd~last fragment frame's payload
 221                  */
 222                 wlanhdr_offset = pnfhdr->attrib.hdrlen + pnfhdr->attrib.iv_len;
 223                 recvframe_pull(pnextrframe, wlanhdr_offset);
 224                 /* append  to first fragment frame's tail (if privacy frame,
 225                  * pull the ICV)
 226                  */
 227                 recvframe_pull_tail(prframe, pfhdr->attrib.icv_len);
 228                 memcpy(pfhdr->rx_tail, pnfhdr->rx_data, pnfhdr->len);
 229                 recvframe_put(prframe, pnfhdr->len);
 230                 pfhdr->attrib.icv_len = pnfhdr->attrib.icv_len;
 231                 plist = plist->next;
 232         }
 233         /* free the defrag_q queue and return the prframe */
 234         r8712_free_recvframe_queue(defrag_q, pfree_recv_queue);
 235         return prframe;
 236 }
 237
 238 /* check if need to defrag, if needed queue the frame to defrag_q */
 239 union recv_frame *r8712_recvframe_chk_defrag(struct _adapter *padapter,
 240                                              union recv_frame *precv_frame)
 241 {
 242         u8      ismfrag;
 243         u8      fragnum;
 244         u8   *psta_addr;
 245         struct recv_frame_hdr *pfhdr;
 246         struct sta_info *psta;
 247         struct  sta_priv *pstapriv;
 248         struct list_head *phead;
 249         union recv_frame *prtnframe = NULL;
 250         struct  __queue *pfree_recv_queue, *pdefrag_q;
 251
 252         pstapriv = &padapter->stapriv;
 253         pfhdr = &precv_frame->u.hdr;
 254         pfree_recv_queue = &padapter->recvpriv.free_recv_queue;
 255         /* need to define struct of wlan header frame ctrl */
 256         ismfrag = pfhdr->attrib.mfrag;
 257         fragnum = pfhdr->attrib.frag_num;
 258         psta_addr = pfhdr->attrib.ta;
 259         psta = r8712_get_stainfo(pstapriv, psta_addr);
 260         if (!psta)
 261                 pdefrag_q = NULL;
 262         else
 263                 pdefrag_q = &psta->sta_recvpriv.defrag_q;
 264
 265         if ((ismfrag == 0) && (fragnum == 0))
 266                 prtnframe = precv_frame;/*isn't a fragment frame*/
 267         if (ismfrag == 1) {
 268                 /* 0~(n-1) fragment frame
 269                  * enqueue to defraf_g
 270                  */
 271                 if (pdefrag_q) {
 272                         if (fragnum == 0) {
 273                                 /*the first fragment*/
 274                                 if (!list_empty(&pdefrag_q->queue)) {
 275                                         /*free current defrag_q */
 276                                         r8712_free_recvframe_queue(pdefrag_q,
 277                                                              pfree_recv_queue);
 278                                 }
 279                         }
 280                         /* Then enqueue the 0~(n-1) fragment to the defrag_q */
 281                         phead = &pdefrag_q->queue;
 282                         list_add_tail(&pfhdr->list, phead);
 283                         prtnframe = NULL;
 284                 } else {
 285                         /* can't find this ta's defrag_queue, so free this
 286                          * recv_frame
 287                          */
 288                         r8712_free_recvframe(precv_frame, pfree_recv_queue);
 289                         prtnframe = NULL;
 290                 }
 291         }
 292         if ((ismfrag == 0) && (fragnum != 0)) {
 293                 /* the last fragment frame
 294                  * enqueue the last fragment
 295                  */
 296                 if (pdefrag_q) {
 297                         phead = &pdefrag_q->queue;
 298                         list_add_tail(&pfhdr->list, phead);
 299                         /*call recvframe_defrag to defrag*/
 300                         precv_frame = recvframe_defrag(padapter, pdefrag_q);
 301                         prtnframe = precv_frame;
 302                 } else {
 303                         /* can't find this ta's defrag_queue, so free this
 304                          *  recv_frame
 305                          */
 306                         r8712_free_recvframe(precv_frame, pfree_recv_queue);
 307                         prtnframe = NULL;
 308                 }
 309         }
 310         if (prtnframe && (prtnframe->u.hdr.attrib.privacy)) {
 311                 /* after defrag we must check tkip mic code */
 312                 if (r8712_recvframe_chkmic(padapter, prtnframe) == _FAIL) {
 313                         r8712_free_recvframe(prtnframe, pfree_recv_queue);
 314                         prtnframe = NULL;
 315                 }
 316         }
 317         return prtnframe;
 318 }
 319
 320 static void amsdu_to_msdu(struct _adapter *padapter, union recv_frame *prframe)
 321 {
 322         int     a_len, padding_len;
 323         u16     eth_type, nSubframe_Length;
 324         u8      nr_subframes, i;
 325         unsigned char *pdata;
 326         struct rx_pkt_attrib *pattrib;
 327         _pkt *sub_skb, *subframes[MAX_SUBFRAME_COUNT];
 328         struct recv_priv *precvpriv = &padapter->recvpriv;
 329         struct  __queue *pfree_recv_queue = &(precvpriv->free_recv_queue);
 330
 331         nr_subframes = 0;
 332         pattrib = &prframe->u.hdr.attrib;
 333         recvframe_pull(prframe, prframe->u.hdr.attrib.hdrlen);
 334         if (prframe->u.hdr.attrib.iv_len > 0)
 335                 recvframe_pull(prframe, prframe->u.hdr.attrib.iv_len);
 336         a_len = prframe->u.hdr.len;
 337         pdata = prframe->u.hdr.rx_data;
 338         while (a_len > ETH_HLEN) {
 339                 /* Offset 12 denote 2 mac address */
 340                 nSubframe_Length = *((u16 *)(pdata + 12));
 341                 /*==m==>change the length order*/
 342                 nSubframe_Length = (nSubframe_Length >> 8) +
 343                                    (nSubframe_Length << 8);
 344                 if (a_len < (ETHERNET_HEADER_SIZE + nSubframe_Length)) {
 345                         netdev_warn(padapter->pnetdev, "r8712u: nRemain_Length is %d and nSubframe_Length is: %d\n",
 346                                     a_len, nSubframe_Length);
 347                         goto exit;
 348                 }
 349                 /* move the data point to data content */
 350                 pdata += ETH_HLEN;
 351                 a_len -= ETH_HLEN;
 352                 /* Allocate new skb for releasing to upper layer */
 353                 sub_skb = dev_alloc_skb(nSubframe_Length + 12);
 354                 if (!sub_skb)
 355                         break;
 356                 skb_reserve(sub_skb, 12);
 357                 skb_put_data(sub_skb, pdata, nSubframe_Length);
 358                 subframes[nr_subframes++] = sub_skb;
 359                 if (nr_subframes >= MAX_SUBFRAME_COUNT) {
 360                         netdev_warn(padapter->pnetdev, "r8712u: ParseSubframe(): Too many Subframes! Packets dropped!\n");
 361                         break;
 362                 }
 363                 pdata += nSubframe_Length;
 364                 a_len -= nSubframe_Length;
 365                 if (a_len != 0) {
 366                         padding_len = 4 - ((nSubframe_Length + ETH_HLEN) & 3);
 367                         if (padding_len == 4)
 368                                 padding_len = 0;
 369                         if (a_len < padding_len)
 370                                 goto exit;
 371                         pdata += padding_len;
 372                         a_len -= padding_len;
 373                 }
 374         }
 375         for (i = 0; i < nr_subframes; i++) {
 376                 sub_skb = subframes[i];
 377                 /* convert hdr + possible LLC headers into Ethernet header */
 378                 eth_type = (sub_skb->data[6] << 8) | sub_skb->data[7];
 379                 if (sub_skb->len >= 8 &&
 380                     ((!memcmp(sub_skb->data, rfc1042_header, SNAP_SIZE) &&
 381                       eth_type != ETH_P_AARP && eth_type != ETH_P_IPX) ||
 382                      !memcmp(sub_skb->data, bridge_tunnel_header, SNAP_SIZE))) {
 383                         /* remove RFC1042 or Bridge-Tunnel encapsulation and
 384                          * replace EtherType
 385                          */
 386                         skb_pull(sub_skb, SNAP_SIZE);
 387                         memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->src,
 388                                ETH_ALEN);
 389                         memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->dst,
 390                                ETH_ALEN);
 391                 } else {
 392                         __be16 len;
 393                         /* Leave Ethernet header part of hdr and full payload */
 394                         len = htons(sub_skb->len);
 395                         memcpy(skb_push(sub_skb, 2), &len, 2);
 396                         memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->src,
 397                                ETH_ALEN);
 398                         memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->dst,
 399                                ETH_ALEN);
 400                 }
 401                 /* Indicate the packets to upper layer */
 402                 if (sub_skb) {
 403                         sub_skb->protocol =
 404                                  eth_type_trans(sub_skb, padapter->pnetdev);
 405                         sub_skb->dev = padapter->pnetdev;
 406                         if ((pattrib->tcpchk_valid == 1) &&
 407                             (pattrib->tcp_chkrpt == 1)) {
 408                                 sub_skb->ip_summed = CHECKSUM_UNNECESSARY;
 409                         } else {
 410                                 sub_skb->ip_summed = CHECKSUM_NONE;
 411                         }
 412                         netif_rx(sub_skb);
 413                 }
 414         }
 415 exit:
 416         prframe->u.hdr.len = 0;
 417         r8712_free_recvframe(prframe, pfree_recv_queue);
 418 }
 419
 420 void r8712_rxcmd_event_hdl(struct _adapter *padapter, void *prxcmdbuf)
 421 {
 422         __le32 voffset;
 423         u8 *poffset;
 424         u16 cmd_len, drvinfo_sz;
 425         struct recv_stat *prxstat;
 426
 427         poffset = prxcmdbuf;
 428         voffset = *(__le32 *)poffset;
 429         prxstat = prxcmdbuf;
 430         drvinfo_sz = (le32_to_cpu(prxstat->rxdw0) & 0x000f0000) >> 16;
 431         drvinfo_sz <<= 3;
 432         poffset += RXDESC_SIZE + drvinfo_sz;
 433         do {
 434                 voffset  = *(__le32 *)poffset;
 435                 cmd_len = (u16)(le32_to_cpu(voffset) & 0xffff);
 436                 r8712_event_handle(padapter, (__le32 *)poffset);
 437                 poffset += (cmd_len + 8);/*8 bytes alignment*/
 438         } while (le32_to_cpu(voffset) & BIT(31));
 439 }
 440
 441 static int check_indicate_seq(struct recv_reorder_ctrl *preorder_ctrl,
 442                               u16 seq_num)
 443 {
 444         u8 wsize = preorder_ctrl->wsize_b;
 445         u16 wend = (preorder_ctrl->indicate_seq + wsize - 1) % 4096;
 446
 447         /* Rx Reorder initialize condition.*/
 448         if (preorder_ctrl->indicate_seq == 0xffff)
 449                 preorder_ctrl->indicate_seq = seq_num;
 450         /* Drop out the packet which SeqNum is smaller than WinStart */
 451         if (SN_LESS(seq_num, preorder_ctrl->indicate_seq))
 452                 return false;
 453         /*
 454          * Sliding window manipulation. Conditions includes:
 455          * 1. Incoming SeqNum is equal to WinStart =>Window shift 1
 456          * 2. Incoming SeqNum is larger than the WinEnd => Window shift N
 457          */
 458         if (SN_EQUAL(seq_num, preorder_ctrl->indicate_seq))
 459                 preorder_ctrl->indicate_seq = (preorder_ctrl->indicate_seq +
 460                                               1) % 4096;
 461         else if (SN_LESS(wend, seq_num)) {
 462                 if (seq_num >= (wsize - 1))
 463                         preorder_ctrl->indicate_seq = seq_num + 1 - wsize;
 464                 else
 465                         preorder_ctrl->indicate_seq = 4095 - (wsize -
 466                                                       (seq_num + 1)) + 1;
 467         }
 468         return true;
 469 }
 470
 471 static int enqueue_reorder_recvframe(struct recv_reorder_ctrl *preorder_ctrl,
 472                                      union recv_frame *prframe)
 473 {
 474         struct list_head *phead, *plist;
 475         union recv_frame *pnextrframe;
 476         struct rx_pkt_attrib *pnextattrib;
 477         struct  __queue *ppending_recvframe_queue =
 478                                         &preorder_ctrl->pending_recvframe_queue;
 479         struct rx_pkt_attrib *pattrib = &prframe->u.hdr.attrib;
 480
 481         phead = &ppending_recvframe_queue->queue;
 482         plist = phead->next;
 483         while (!end_of_queue_search(phead, plist)) {
 484                 pnextrframe = container_of(plist, union recv_frame, u.list);
 485                 pnextattrib = &pnextrframe->u.hdr.attrib;
 486                 if (SN_LESS(pnextattrib->seq_num, pattrib->seq_num))
 487                         plist = plist->next;
 488                 else if (SN_EQUAL(pnextattrib->seq_num, pattrib->seq_num))
 489                         return false;
 490                 else
 491                         break;
 492         }
 493         list_del_init(&(prframe->u.hdr.list));
 494         list_add_tail(&(prframe->u.hdr.list), plist);
 495         return true;
 496 }
 497
 498 int r8712_recv_indicatepkts_in_order(struct _adapter *padapter,
 499                                      struct recv_reorder_ctrl *preorder_ctrl,
 500                                      int bforced)
 501 {
 502         struct list_head *phead, *plist;
 503         union recv_frame *prframe;
 504         struct rx_pkt_attrib *pattrib;
 505         int bPktInBuf = false;
 506         struct  __queue *ppending_recvframe_queue =
 507                          &preorder_ctrl->pending_recvframe_queue;
 508
 509         phead = &ppending_recvframe_queue->queue;
 510         plist = phead->next;
 511         /* Handling some condition for forced indicate case.*/
 512         if (bforced) {
 513                 if (list_empty(phead))
 514                         return true;
 515
 516                 prframe = container_of(plist, union recv_frame, u.list);
 517                 pattrib = &prframe->u.hdr.attrib;
 518                 preorder_ctrl->indicate_seq = pattrib->seq_num;
 519         }
 520         /* Prepare indication list and indication.
 521          * Check if there is any packet need indicate.
 522          */
 523         while (!list_empty(phead)) {
 524                 prframe = container_of(plist, union recv_frame, u.list);
 525                 pattrib = &prframe->u.hdr.attrib;
 526                 if (!SN_LESS(preorder_ctrl->indicate_seq, pattrib->seq_num)) {
 527                         plist = plist->next;
 528                         list_del_init(&(prframe->u.hdr.list));
 529                         if (SN_EQUAL(preorder_ctrl->indicate_seq,
 530                                      pattrib->seq_num))
 531                                 preorder_ctrl->indicate_seq =
 532                                   (preorder_ctrl->indicate_seq + 1) % 4096;
 533                         /*indicate this recv_frame*/
 534                         if (!pattrib->amsdu) {
 535                                 if (!padapter->driver_stopped &&
 536                                     !padapter->surprise_removed) {
 537                                         /* indicate this recv_frame */
 538                                         r8712_recv_indicatepkt(padapter,
 539                                                                prframe);
 540                                 }
 541                         } else if (pattrib->amsdu == 1) {
 542                                 amsdu_to_msdu(padapter, prframe);
 543                         }
 544                         /* Update local variables. */
 545                         bPktInBuf = false;
 546                 } else {
 547                         bPktInBuf = true;
 548                         break;
 549                 }
 550         }
 551         return bPktInBuf;
 552 }
 553
 554 static int recv_indicatepkt_reorder(struct _adapter *padapter,
 555                                     union recv_frame *prframe)
 556 {
 557         unsigned long irql;
 558         struct rx_pkt_attrib *pattrib = &prframe->u.hdr.attrib;
 559         struct recv_reorder_ctrl *preorder_ctrl = prframe->u.hdr.preorder_ctrl;
 560         struct  __queue *ppending_recvframe_queue =
 561                          &preorder_ctrl->pending_recvframe_queue;
 562
 563         if (!pattrib->amsdu) {
 564                 /* s1. */
 565                 r8712_wlanhdr_to_ethhdr(prframe);
 566                 if (pattrib->qos != 1) {
 567                         if (!padapter->driver_stopped &&
 568                             !padapter->surprise_removed) {
 569                                 r8712_recv_indicatepkt(padapter, prframe);
 570                                 return 0;
 571                         } else {
 572                                 return -EINVAL;
 573                         }
 574                 }
 575         }
 576         spin_lock_irqsave(&ppending_recvframe_queue->lock, irql);
 577         /*s2. check if winstart_b(indicate_seq) needs to be updated*/
 578         if (!check_indicate_seq(preorder_ctrl, pattrib->seq_num))
 579                 goto _err_exit;
 580         /*s3. Insert all packet into Reorder Queue to maintain its ordering.*/
 581         if (!enqueue_reorder_recvframe(preorder_ctrl, prframe))
 582                 goto _err_exit;
 583         /*s4.
 584          * Indication process.
 585          * After Packet dropping and Sliding Window shifting as above, we can
 586          * now just indicate the packets with the SeqNum smaller than latest
 587          * WinStart and buffer other packets.
 588          *
 589          * For Rx Reorder condition:
 590          * 1. All packets with SeqNum smaller than WinStart => Indicate
 591          * 2. All packets with SeqNum larger than or equal to
 592          * WinStart => Buffer it.
 593          */
 594         if (r8712_recv_indicatepkts_in_order(padapter, preorder_ctrl, false)) {
 595                 mod_timer(&preorder_ctrl->reordering_ctrl_timer,
 596                           jiffies + msecs_to_jiffies(REORDER_WAIT_TIME));
 597                 spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
 598         } else {
 599                 spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
 600                 del_timer(&preorder_ctrl->reordering_ctrl_timer);
 601         }
 602         return 0;
 603 _err_exit:
 604         spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
 605         return -ENOMEM;
 606 }
 607
 608 void r8712_reordering_ctrl_timeout_handler(void *pcontext)
 609 {
 610         unsigned long irql;
 611         struct recv_reorder_ctrl *preorder_ctrl = pcontext;
 612         struct _adapter *padapter = preorder_ctrl->padapter;
 613         struct  __queue *ppending_recvframe_queue =
 614                                  &preorder_ctrl->pending_recvframe_queue;
 615
 616         if (padapter->driver_stopped || padapter->surprise_removed)
 617                 return;
 618         spin_lock_irqsave(&ppending_recvframe_queue->lock, irql);
 619         r8712_recv_indicatepkts_in_order(padapter, preorder_ctrl, true);
 620         spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
 621 }
 622
 623 static int r8712_process_recv_indicatepkts(struct _adapter *padapter,
 624                                            union recv_frame *prframe)
 625 {
 626         int retval = _SUCCESS;
 627         struct mlme_priv *pmlmepriv = &padapter->mlmepriv;
 628         struct ht_priv  *phtpriv = &pmlmepriv->htpriv;
 629
 630         if (phtpriv->ht_option == 1) { /*B/G/N Mode*/
 631                 if (recv_indicatepkt_reorder(padapter, prframe)) {
 632                         /* including perform A-MPDU Rx Ordering Buffer Control*/
 633                         if (!padapter->driver_stopped &&
 634                             !padapter->surprise_removed)
 635                                 return _FAIL;
 636                 }
 637         } else { /*B/G mode*/
 638                 retval = r8712_wlanhdr_to_ethhdr(prframe);
 639                 if (retval)
 640                         return _FAIL;
 641                 if (!padapter->driver_stopped && !padapter->surprise_removed) {
 642                         /* indicate this recv_frame */
 643                         r8712_recv_indicatepkt(padapter, prframe);
 644                 } else {
 645                         return _FAIL;
 646                 }
 647         }
 648         return retval;
 649 }
 650
 651 static u8 query_rx_pwr_percentage(s8 antpower)
 652 {
 653         if ((antpower <= -100) || (antpower >= 20))
 654                 return  0;
 655         else if (antpower >= 0)
 656                 return  100;
 657         else
 658                 return 100 + antpower;
 659 }
 660
 661 static u8 evm_db2percentage(s8 value)
 662 {
 663         /*
 664          * -33dB~0dB to 0%~99%
 665          */
 666         s8 ret_val = clamp(-value, 0, 33) * 3;
 667
 668         if (ret_val == 99)
 669                 ret_val = 100;
 670
 671         return ret_val;
 672 }
 673
 674 s32 r8712_signal_scale_mapping(s32 cur_sig)
 675 {
 676         s32 ret_sig;
 677
 678         if (cur_sig >= 51 && cur_sig <= 100)
 679                 ret_sig = 100;
 680         else if (cur_sig >= 41 && cur_sig <= 50)
 681                 ret_sig = 80 + ((cur_sig - 40) * 2);
 682         else if (cur_sig >= 31 && cur_sig <= 40)
 683                 ret_sig = 66 + (cur_sig - 30);
 684         else if (cur_sig >= 21 && cur_sig <= 30)
 685                 ret_sig = 54 + (cur_sig - 20);
 686         else if (cur_sig >= 10 && cur_sig <= 20)
 687                 ret_sig = 42 + (((cur_sig - 10) * 2) / 3);
 688         else if (cur_sig >= 5 && cur_sig <= 9)
 689                 ret_sig = 22 + (((cur_sig - 5) * 3) / 2);
 690         else if (cur_sig >= 1 && cur_sig <= 4)
 691                 ret_sig = 6 + (((cur_sig - 1) * 3) / 2);
 692         else
 693                 ret_sig = cur_sig;
 694         return ret_sig;
 695 }
 696
 697 static s32  translate2dbm(struct _adapter *padapter, u8 signal_strength_idx)
 698 {
 699         s32 signal_power; /* in dBm.*/
 700         /* Translate to dBm (x=0.5y-95).*/
 701         signal_power = (s32)((signal_strength_idx + 1) >> 1);
 702         signal_power -= 95;
 703         return signal_power;
 704 }
 705
 706 static void query_rx_phy_status(struct _adapter *padapter,
 707                                 union recv_frame *prframe)
 708 {
 709         u8 i, max_spatial_stream, evm;
 710         struct recv_stat *prxstat = (struct recv_stat *)prframe->u.hdr.rx_head;
 711         struct phy_stat *pphy_stat = (struct phy_stat *)(prxstat + 1);
 712         u8 *pphy_head = (u8 *)(prxstat + 1);
 713         s8 rx_pwr[4], rx_pwr_all;
 714         u8 pwdb_all;
 715         u32 rssi, total_rssi = 0;
 716         u8 bcck_rate = 0, rf_rx_num = 0, cck_highpwr = 0;
 717         struct phy_cck_rx_status *pcck_buf;
 718         u8 sq;
 719
 720         /* Record it for next packet processing*/
 721         bcck_rate = (prframe->u.hdr.attrib.mcs_rate <= 3 ? 1 : 0);
 722         if (bcck_rate) {
 723                 u8 report;
 724
 725                 /* CCK Driver info Structure is not the same as OFDM packet.*/
 726                 pcck_buf = (struct phy_cck_rx_status *)pphy_stat;
 727                 /* (1)Hardware does not provide RSSI for CCK
 728                  * (2)PWDB, Average PWDB calculated by hardware
 729                  * (for rate adaptive)
 730                  */
 731                 if (!cck_highpwr) {
 732                         report = pcck_buf->cck_agc_rpt & 0xc0;
 733                         report >>= 6;
 734                         switch (report) {
 735                         /* Modify the RF RNA gain value to -40, -20,
 736                          * -2, 14 by Jenyu's suggestion
 737                          * Note: different RF with the different
 738                          * RNA gain.
 739                          */
 740                         case 0x3:
 741                                 rx_pwr_all = -40 - (pcck_buf->cck_agc_rpt &
 742                                              0x3e);
 743                                 break;
 744                         case 0x2:
 745                                 rx_pwr_all = -20 - (pcck_buf->cck_agc_rpt &
 746                                              0x3e);
 747                                 break;
 748                         case 0x1:
 749                                 rx_pwr_all = -2 - (pcck_buf->cck_agc_rpt &
 750                                              0x3e);
 751                                 break;
 752                         case 0x0:
 753                                 rx_pwr_all = 14 - (pcck_buf->cck_agc_rpt &
 754                                              0x3e);
 755                                 break;
 756                         }
 757                 } else {
 758                         report = ((u8)(le32_to_cpu(pphy_stat->phydw1) >> 8)) &
 759                                  0x60;
 760                         report >>= 5;
 761                         switch (report) {
 762                         case 0x3:
 763                                 rx_pwr_all = -40 - ((pcck_buf->cck_agc_rpt &
 764                                              0x1f) << 1);
 765                                 break;
 766                         case 0x2:
 767                                 rx_pwr_all = -20 - ((pcck_buf->cck_agc_rpt &
 768                                              0x1f) << 1);
 769                                 break;
 770                         case 0x1:
 771                                 rx_pwr_all = -2 - ((pcck_buf->cck_agc_rpt &
 772                                              0x1f) << 1);
 773                                 break;
 774                         case 0x0:
 775                                 rx_pwr_all = 14 - ((pcck_buf->cck_agc_rpt &
 776                                              0x1f) << 1);
 777                                 break;
 778                         }
 779                 }
 780                 pwdb_all = query_rx_pwr_percentage(rx_pwr_all);
 781                 /* CCK gain is smaller than OFDM/MCS gain,*/
 782                 /* so we add gain diff by experiences, the val is 6 */
 783                 pwdb_all += 6;
 784                 if (pwdb_all > 100)
 785                         pwdb_all = 100;
 786                 /* modify the offset to make the same gain index with OFDM.*/
 787                 if (pwdb_all > 34 && pwdb_all <= 42)
 788                         pwdb_all -= 2;
 789                 else if (pwdb_all > 26 && pwdb_all <= 34)
 790                         pwdb_all -= 6;
 791                 else if (pwdb_all > 14 && pwdb_all <= 26)
 792                         pwdb_all -= 8;
 793                 else if (pwdb_all > 4 && pwdb_all <= 14)
 794                         pwdb_all -= 4;
 795                 /*
 796                  * (3) Get Signal Quality (EVM)
 797                  */
 798                 if (pwdb_all > 40) {
 799                         sq = 100;
 800                 } else {
 801                         sq = pcck_buf->sq_rpt;
 802                         if (pcck_buf->sq_rpt > 64)
 803                                 sq = 0;
 804                         else if (pcck_buf->sq_rpt < 20)
 805                                 sq = 100;
 806                         else
 807                                 sq = ((64 - sq) * 100) / 44;
 808                 }
 809                 prframe->u.hdr.attrib.signal_qual = sq;
 810                 prframe->u.hdr.attrib.rx_mimo_signal_qual[0] = sq;
 811                 prframe->u.hdr.attrib.rx_mimo_signal_qual[1] = -1;
 812         } else {
 813                 /* (1)Get RSSI for HT rate */
 814                 for (i = 0; i < ((padapter->registrypriv.rf_config) &
 815                             0x0f); i++) {
 816                         rf_rx_num++;
 817                         rx_pwr[i] = ((pphy_head[PHY_STAT_GAIN_TRSW_SHT + i]
 818                                     & 0x3F) * 2) - 110;
 819                         /* Translate DBM to percentage. */
 820                         rssi = query_rx_pwr_percentage(rx_pwr[i]);
 821                         total_rssi += rssi;
 822                 }
 823                 /* (2)PWDB, Average PWDB calculated by hardware (for
 824                  * rate adaptive)
 825                  */
 826                 rx_pwr_all = (((pphy_head[PHY_STAT_PWDB_ALL_SHT]) >> 1) & 0x7f)
 827                              - 106;
 828                 pwdb_all = query_rx_pwr_percentage(rx_pwr_all);
 829
 830                 {
 831                         /* (3)EVM of HT rate */
 832                         if (prframe->u.hdr.attrib.htc &&
 833                             prframe->u.hdr.attrib.mcs_rate >= 20 &&
 834                             prframe->u.hdr.attrib.mcs_rate <= 27) {
 835                                 /* both spatial stream make sense */
 836                                 max_spatial_stream = 2;
 837                         } else {
 838                                 /* only spatial stream 1 makes sense */
 839                                 max_spatial_stream = 1;
 840                         }
 841                         for (i = 0; i < max_spatial_stream; i++) {
 842                                 evm = evm_db2percentage((pphy_head
 843                                       [PHY_STAT_RXEVM_SHT + i]));/*dbm*/
 844                                 prframe->u.hdr.attrib.signal_qual =
 845                                          (u8)(evm & 0xff);
 846                                 prframe->u.hdr.attrib.rx_mimo_signal_qual[i] =
 847                                          (u8)(evm & 0xff);
 848                         }
 849                 }
 850         }
 851         /* UI BSS List signal strength(in percentage), make it good looking,
 852          * from 0~100. It is assigned to the BSS List in
 853          * GetValueFromBeaconOrProbeRsp().
 854          */
 855         if (bcck_rate) {
 856                 prframe->u.hdr.attrib.signal_strength =
 857                          (u8)r8712_signal_scale_mapping(pwdb_all);
 858         } else {
 859                 if (rf_rx_num != 0)
 860                         prframe->u.hdr.attrib.signal_strength =
 861                                  (u8)(r8712_signal_scale_mapping(total_rssi /=
 862                                  rf_rx_num));
 863         }
 864 }
 865
 866 static void process_link_qual(struct _adapter *padapter,
 867                               union recv_frame *prframe)
 868 {
 869         u32     last_evm = 0, tmpVal;
 870         struct rx_pkt_attrib *pattrib;
 871         struct smooth_rssi_data *sqd = &padapter->recvpriv.signal_qual_data;
 872
 873         if (!prframe || !padapter)
 874                 return;
 875         pattrib = &prframe->u.hdr.attrib;
 876         if (pattrib->signal_qual != 0) {
 877                 /*
 878                  * 1. Record the general EVM to the sliding window.
 879                  */
 880                 if (sqd->total_num++ >= PHY_LINKQUALITY_SLID_WIN_MAX) {
 881                         sqd->total_num = PHY_LINKQUALITY_SLID_WIN_MAX;
 882                         last_evm = sqd->elements[sqd->index];
 883                         sqd->total_val -= last_evm;
 884                 }
 885                 sqd->total_val += pattrib->signal_qual;
 886                 sqd->elements[sqd->index++] = pattrib->signal_qual;
 887                 if (sqd->index >= PHY_LINKQUALITY_SLID_WIN_MAX)
 888                         sqd->index = 0;
 889
 890                 /* <1> Showed on UI for user, in percentage. */
 891                 tmpVal = sqd->total_val / sqd->total_num;
 892                 padapter->recvpriv.signal = (u8)tmpVal;
 893         }
 894 }
 895
 896 static void process_rssi(struct _adapter *padapter, union recv_frame *prframe)
 897 {
 898         u32 last_rssi, tmp_val;
 899         struct rx_pkt_attrib *pattrib = &prframe->u.hdr.attrib;
 900         struct smooth_rssi_data *ssd = &padapter->recvpriv.signal_strength_data;
 901
 902         if (ssd->total_num++ >= PHY_RSSI_SLID_WIN_MAX) {
 903                 ssd->total_num = PHY_RSSI_SLID_WIN_MAX;
 904                 last_rssi = ssd->elements[ssd->index];
 905                 ssd->total_val -= last_rssi;
 906         }
 907         ssd->total_val += pattrib->signal_strength;
 908         ssd->elements[ssd->index++] = pattrib->signal_strength;
 909         if (ssd->index >= PHY_RSSI_SLID_WIN_MAX)
 910                 ssd->index = 0;
 911         tmp_val = ssd->total_val / ssd->total_num;
 912         padapter->recvpriv.rssi = (s8)translate2dbm(padapter, (u8)tmp_val);
 913 }
 914
 915 static void process_phy_info(struct _adapter *padapter,
 916                              union recv_frame *prframe)
 917 {
 918         query_rx_phy_status(padapter, prframe);
 919         process_rssi(padapter, prframe);
 920         process_link_qual(padapter,  prframe);
 921 }
 922
 923 int recv_func(struct _adapter *padapter, void *pcontext)
 924 {
 925         struct rx_pkt_attrib *pattrib;
 926         union recv_frame *prframe, *orig_prframe;
 927         int retval = _SUCCESS;
 928         struct  __queue *pfree_recv_queue = &padapter->recvpriv.free_recv_queue;
 929         struct  mlme_priv       *pmlmepriv = &padapter->mlmepriv;
 930
 931         prframe = pcontext;
 932         orig_prframe = prframe;
 933         pattrib = &prframe->u.hdr.attrib;
 934         if (check_fwstate(pmlmepriv, WIFI_MP_STATE)) {
 935                 if (pattrib->crc_err == 1)
 936                         padapter->mppriv.rx_crcerrpktcount++;
 937                 else
 938                         padapter->mppriv.rx_pktcount++;
 939                 if (!check_fwstate(pmlmepriv, WIFI_MP_LPBK_STATE)) {
 940                         /* free this recv_frame */
 941                         r8712_free_recvframe(orig_prframe, pfree_recv_queue);
 942                         goto _exit_recv_func;
 943                 }
 944         }
 945         /* check the frame crtl field and decache */
 946         retval = r8712_validate_recv_frame(padapter, prframe);
 947         if (retval != _SUCCESS) {
 948                 /* free this recv_frame */
 949                 r8712_free_recvframe(orig_prframe, pfree_recv_queue);
 950                 goto _exit_recv_func;
 951         }
 952         process_phy_info(padapter, prframe);
 953         prframe = r8712_decryptor(padapter, prframe);
 954         if (!prframe) {
 955                 retval = _FAIL;
 956                 goto _exit_recv_func;
 957         }
 958         prframe = r8712_recvframe_chk_defrag(padapter, prframe);
 959         if (!prframe)
 960                 goto _exit_recv_func;
 961         prframe = r8712_portctrl(padapter, prframe);
 962         if (!prframe) {
 963                 retval = _FAIL;
 964                 goto _exit_recv_func;
 965         }
 966         retval = r8712_process_recv_indicatepkts(padapter, prframe);
 967         if (retval != _SUCCESS) {
 968                 r8712_free_recvframe(orig_prframe, pfree_recv_queue);
 969                 goto _exit_recv_func;
 970         }
 971 _exit_recv_func:
 972         return retval;
 973 }
 974
 975 static void recvbuf2recvframe(struct _adapter *padapter, struct sk_buff *pskb)
 976 {
 977         u8 *pbuf, shift_sz = 0;
 978         u8      frag, mf;
 979         uint    pkt_len;
 980         u32 transfer_len;
 981         struct recv_stat *prxstat;
 982         u16     pkt_cnt, drvinfo_sz, pkt_offset, tmp_len, alloc_sz;
 983         struct  __queue *pfree_recv_queue;
 984         _pkt  *pkt_copy = NULL;
 985         union recv_frame *precvframe = NULL;
 986         struct recv_priv *precvpriv = &padapter->recvpriv;
 987
 988         pfree_recv_queue = &(precvpriv->free_recv_queue);
 989         pbuf = pskb->data;
 990         prxstat = (struct recv_stat *)pbuf;
 991         pkt_cnt = (le32_to_cpu(prxstat->rxdw2) >> 16) & 0xff;
 992         pkt_len =  le32_to_cpu(prxstat->rxdw0) & 0x00003fff;
 993         transfer_len = pskb->len;
 994         /* Test throughput with Netgear 3700 (No security) with Chariot 3T3R
 995          * pairs. The packet count will be a big number so that the containing
 996          * packet will effect the Rx reordering.
 997          */
 998         if (transfer_len < pkt_len) {
 999                 /* In this case, it means the MAX_RECVBUF_SZ is too small to
1000                  * get the data from 8712u.
1001                  */
1002                 return;
1003         }
1004         do {
1005                 prxstat = (struct recv_stat *)pbuf;
1006                 pkt_len =  le32_to_cpu(prxstat->rxdw0) & 0x00003fff;
1007                 /* more fragment bit */
1008                 mf = (le32_to_cpu(prxstat->rxdw1) >> 27) & 0x1;
1009                 /* ragmentation number */
1010                 frag = (le32_to_cpu(prxstat->rxdw2) >> 12) & 0xf;
1011                 /* uint 2^3 = 8 bytes */
1012                 drvinfo_sz = (le32_to_cpu(prxstat->rxdw0) & 0x000f0000) >> 16;
1013                 drvinfo_sz <<= 3;
1014                 if (pkt_len <= 0)
1015                         return;
1016                 /* Qos data, wireless lan header length is 26 */
1017                 if ((le32_to_cpu(prxstat->rxdw0) >> 23) & 0x01)
1018                         shift_sz = 2;
1019                 precvframe = r8712_alloc_recvframe(pfree_recv_queue);
1020                 if (!precvframe)
1021                         return;
1022                 INIT_LIST_HEAD(&precvframe->u.hdr.list);
1023                 precvframe->u.hdr.precvbuf = NULL; /*can't access the precvbuf*/
1024                 precvframe->u.hdr.len = 0;
1025                 tmp_len = pkt_len + drvinfo_sz + RXDESC_SIZE;
1026                 pkt_offset = (u16)round_up(tmp_len, 128);
1027                 /* for first fragment packet, driver need allocate 1536 +
1028                  * drvinfo_sz + RXDESC_SIZE to defrag packet.
1029                  */
1030                 if ((mf == 1) && (frag == 0))
1031                         /*1658+6=1664, 1664 is 128 alignment.*/
1032                         alloc_sz = max_t(u16, tmp_len, 1658);
1033                 else
1034                         alloc_sz = tmp_len;
1035                 /* 2 is for IP header 4 bytes alignment in QoS packet case.
1036                  * 4 is for skb->data 4 bytes alignment.
1037                  */
1038                 alloc_sz += 6;
1039                 pkt_copy = netdev_alloc_skb(padapter->pnetdev, alloc_sz);
1040                 if (pkt_copy) {
1041                         precvframe->u.hdr.pkt = pkt_copy;
1042                         skb_reserve(pkt_copy, 4 - ((addr_t)(pkt_copy->data)
1043                                     % 4));
1044                         skb_reserve(pkt_copy, shift_sz);
1045                         memcpy(pkt_copy->data, pbuf, tmp_len);
1046                         precvframe->u.hdr.rx_head = precvframe->u.hdr.rx_data =
1047                                  precvframe->u.hdr.rx_tail = pkt_copy->data;
1048                         precvframe->u.hdr.rx_end = pkt_copy->data + alloc_sz;
1049                 } else {
1050                         precvframe->u.hdr.pkt = skb_clone(pskb, GFP_ATOMIC);
1051                         if (!precvframe->u.hdr.pkt)
1052                                 return;
1053                         precvframe->u.hdr.rx_head = pbuf;
1054                         precvframe->u.hdr.rx_data = pbuf;
1055                         precvframe->u.hdr.rx_tail = pbuf;
1056                         precvframe->u.hdr.rx_end = pbuf + alloc_sz;
1057                 }
1058                 recvframe_put(precvframe, tmp_len);
1059                 recvframe_pull(precvframe, drvinfo_sz + RXDESC_SIZE);
1060                 /* because the endian issue, driver avoid reference to the
1061                  * rxstat after calling update_recvframe_attrib_from_recvstat();
1062                  */
1063                 update_recvframe_attrib_from_recvstat(&precvframe->u.hdr.attrib,
1064                                                       prxstat);
1065                 r8712_recv_entry(precvframe);
1066                 transfer_len -= pkt_offset;
1067                 pbuf += pkt_offset;
1068                 pkt_cnt--;
1069                 precvframe = NULL;
1070                 pkt_copy = NULL;
1071         } while ((transfer_len > 0) && pkt_cnt > 0);
1072 }
1073
1074 static void recv_tasklet(unsigned long priv)
1075 {
1076         struct sk_buff *pskb;
1077         struct _adapter *padapter = (struct _adapter *)priv;
1078         struct recv_priv *precvpriv = &padapter->recvpriv;
1079
1080         while (NULL != (pskb = skb_dequeue(&precvpriv->rx_skb_queue))) {
1081                 recvbuf2recvframe(padapter, pskb);
1082                 skb_reset_tail_pointer(pskb);
1083                 pskb->len = 0;
1084                 if (!skb_cloned(pskb))
1085                         skb_queue_tail(&precvpriv->free_recv_skb_queue, pskb);
1086                 else
1087                         consume_skb(pskb);
1088         }
1089 }