drivers/staging/rtl8712/rtl8712_recv.c

   1 /******************************************************************************
   2  * rtl8712_recv.c
   3  *
   4  * Copyright(c) 2007 - 2010 Realtek Corporation. All rights reserved.
   5  * Linux device driver for RTL8192SU
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of version 2 of the GNU General Public License as
   9  * published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14  * more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along with
  17  * this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  19  *
  20  * Modifications for inclusion into the Linux staging tree are
  21  * Copyright(c) 2010 Larry Finger. All rights reserved.
  22  *
  23  * Contact information:
  24  * WLAN FAE <wlanfae@realtek.com>
  25  * Larry Finger <Larry.Finger@lwfinger.net>
  26  *
  27  ******************************************************************************/
  28
  29 #define _RTL8712_RECV_C_
  30
  31 #include <linux/if_ether.h>
  32 #include <linux/ip.h>
  33
  34 #include "osdep_service.h"
  35 #include "drv_types.h"
  36 #include "recv_osdep.h"
  37 #include "mlme_osdep.h"
  38 #include "ethernet.h"
  39 #include "usb_ops.h"
  40 #include "wifi.h"
  41
  42 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
  43 static u8 bridge_tunnel_header[] = {0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8};
  44
  45 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
  46 static u8 rfc1042_header[] = {0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00};
  47
  48 static void recv_tasklet(void *priv);
  49
  50 int r8712_init_recv_priv(struct recv_priv *precvpriv, struct _adapter *padapter)
  51 {
  52         int i;
  53         struct recv_buf *precvbuf;
  54         int res = _SUCCESS;
  55         addr_t tmpaddr = 0;
  56         int alignment = 0;
  57         struct sk_buff *pskb = NULL;
  58
  59         /*init recv_buf*/
  60         _init_queue(&precvpriv->free_recv_buf_queue);
  61         precvpriv->pallocated_recv_buf =
  62                 kzalloc(NR_RECVBUFF * sizeof(struct recv_buf) + 4, GFP_ATOMIC);
  63         if (!precvpriv->pallocated_recv_buf)
  64                 return _FAIL;
  65         precvpriv->precv_buf = precvpriv->pallocated_recv_buf + 4 -
  66                               ((addr_t) (precvpriv->pallocated_recv_buf) & 3);
  67         precvbuf = (struct recv_buf *)precvpriv->precv_buf;
  68         for (i = 0; i < NR_RECVBUFF; i++) {
  69                 INIT_LIST_HEAD(&precvbuf->list);
  70                 spin_lock_init(&precvbuf->recvbuf_lock);
  71                 res = r8712_os_recvbuf_resource_alloc(padapter, precvbuf);
  72                 if (res == _FAIL)
  73                         break;
  74                 precvbuf->ref_cnt = 0;
  75                 precvbuf->adapter = padapter;
  76                 list_add_tail(&precvbuf->list,
  77                                  &(precvpriv->free_recv_buf_queue.queue));
  78                 precvbuf++;
  79         }
  80         precvpriv->free_recv_buf_queue_cnt = NR_RECVBUFF;
  81         tasklet_init(&precvpriv->recv_tasklet,
  82              (void(*)(unsigned long))recv_tasklet,
  83              (unsigned long)padapter);
  84         skb_queue_head_init(&precvpriv->rx_skb_queue);
  85
  86         skb_queue_head_init(&precvpriv->free_recv_skb_queue);
  87         for (i = 0; i < NR_PREALLOC_RECV_SKB; i++) {
  88                 pskb = netdev_alloc_skb(padapter->pnetdev, MAX_RECVBUF_SZ +
  89                        RECVBUFF_ALIGN_SZ);
  90                 if (pskb) {
  91                         tmpaddr = (addr_t)pskb->data;
  92                         alignment = tmpaddr & (RECVBUFF_ALIGN_SZ - 1);
  93                         skb_reserve(pskb, (RECVBUFF_ALIGN_SZ - alignment));
  94                         skb_queue_tail(&precvpriv->free_recv_skb_queue, pskb);
  95                 }
  96                 pskb = NULL;
  97         }
  98         return res;
  99 }
 100
 101 void r8712_free_recv_priv(struct recv_priv *precvpriv)
 102 {
 103         int i;
 104         struct recv_buf *precvbuf;
 105         struct _adapter *padapter = precvpriv->adapter;
 106
 107         precvbuf = (struct recv_buf *)precvpriv->precv_buf;
 108         for (i = 0; i < NR_RECVBUFF; i++) {
 109                 r8712_os_recvbuf_resource_free(padapter, precvbuf);
 110                 precvbuf++;
 111         }
 112         kfree(precvpriv->pallocated_recv_buf);
 113         skb_queue_purge(&precvpriv->rx_skb_queue);
 114         if (skb_queue_len(&precvpriv->rx_skb_queue))
 115                 netdev_warn(padapter->pnetdev, "r8712u: rx_skb_queue not empty\n");
 116         skb_queue_purge(&precvpriv->free_recv_skb_queue);
 117         if (skb_queue_len(&precvpriv->free_recv_skb_queue))
 118                 netdev_warn(padapter->pnetdev, "r8712u: free_recv_skb_queue not empty %d\n",
 119                             skb_queue_len(&precvpriv->free_recv_skb_queue));
 120 }
 121
 122 int r8712_init_recvbuf(struct _adapter *padapter, struct recv_buf *precvbuf)
 123 {
 124         precvbuf->transfer_len = 0;
 125         precvbuf->len = 0;
 126         precvbuf->ref_cnt = 0;
 127         if (precvbuf->pbuf) {
 128                 precvbuf->pdata = precvbuf->pbuf;
 129                 precvbuf->phead = precvbuf->pbuf;
 130                 precvbuf->ptail = precvbuf->pbuf;
 131                 precvbuf->pend = precvbuf->pdata + MAX_RECVBUF_SZ;
 132         }
 133         return _SUCCESS;
 134 }
 135
 136 int r8712_free_recvframe(union recv_frame *precvframe,
 137                    struct  __queue *pfree_recv_queue)
 138 {
 139         unsigned long irqL;
 140         struct _adapter *padapter = precvframe->u.hdr.adapter;
 141         struct recv_priv *precvpriv = &padapter->recvpriv;
 142
 143         if (precvframe->u.hdr.pkt) {
 144                 dev_kfree_skb_any(precvframe->u.hdr.pkt);/*free skb by driver*/
 145                 precvframe->u.hdr.pkt = NULL;
 146         }
 147         spin_lock_irqsave(&pfree_recv_queue->lock, irqL);
 148         list_del_init(&(precvframe->u.hdr.list));
 149         list_add_tail(&(precvframe->u.hdr.list), &pfree_recv_queue->queue);
 150         if (padapter != NULL) {
 151                 if (pfree_recv_queue == &precvpriv->free_recv_queue)
 152                                 precvpriv->free_recvframe_cnt++;
 153         }
 154         spin_unlock_irqrestore(&pfree_recv_queue->lock, irqL);
 155         return _SUCCESS;
 156 }
 157
 158 static void update_recvframe_attrib_from_recvstat(struct rx_pkt_attrib *pattrib,
 159                                            struct recv_stat *prxstat)
 160 {
 161         u16 drvinfo_sz;
 162
 163         drvinfo_sz = (le32_to_cpu(prxstat->rxdw0) & 0x000f0000) >> 16;
 164         drvinfo_sz <<= 3;
 165         /*TODO:
 166          * Offset 0
 167          */
 168         pattrib->bdecrypted = ((le32_to_cpu(prxstat->rxdw0) & BIT(27)) >> 27)
 169                                  ? 0 : 1;
 170         pattrib->crc_err = (le32_to_cpu(prxstat->rxdw0) & BIT(14)) >> 14;
 171         /*Offset 4*/
 172         /*Offset 8*/
 173         /*Offset 12*/
 174         if (le32_to_cpu(prxstat->rxdw3) & BIT(13)) {
 175                 pattrib->tcpchk_valid = 1; /* valid */
 176                 if (le32_to_cpu(prxstat->rxdw3) & BIT(11))
 177                         pattrib->tcp_chkrpt = 1; /* correct */
 178                 else
 179                         pattrib->tcp_chkrpt = 0; /* incorrect */
 180                 if (le32_to_cpu(prxstat->rxdw3) & BIT(12))
 181                         pattrib->ip_chkrpt = 1; /* correct */
 182                 else
 183                         pattrib->ip_chkrpt = 0; /* incorrect */
 184         } else {
 185                 pattrib->tcpchk_valid = 0; /* invalid */
 186         }
 187         pattrib->mcs_rate = (u8)((le32_to_cpu(prxstat->rxdw3)) & 0x3f);
 188         pattrib->htc = (u8)((le32_to_cpu(prxstat->rxdw3) >> 14) & 0x1);
 189         /*Offset 16*/
 190         /*Offset 20*/
 191         /*phy_info*/
 192 }
 193
 194 /*perform defrag*/
 195 static union recv_frame *recvframe_defrag(struct _adapter *adapter,
 196                                    struct  __queue *defrag_q)
 197 {
 198         struct list_head *plist, *phead;
 199         u8 wlanhdr_offset;
 200         u8      curfragnum;
 201         struct recv_frame_hdr *pfhdr, *pnfhdr;
 202         union recv_frame *prframe, *pnextrframe;
 203         struct  __queue *pfree_recv_queue;
 204
 205         pfree_recv_queue = &adapter->recvpriv.free_recv_queue;
 206         phead = &defrag_q->queue;
 207         plist = phead->next;
 208         prframe = container_of(plist, union recv_frame, u.list);
 209         list_del_init(&prframe->u.list);
 210         pfhdr = &prframe->u.hdr;
 211         curfragnum = 0;
 212         if (curfragnum != pfhdr->attrib.frag_num) {
 213                 /*the first fragment number must be 0
 214                  *free the whole queue
 215                  */
 216                 r8712_free_recvframe(prframe, pfree_recv_queue);
 217                 r8712_free_recvframe_queue(defrag_q, pfree_recv_queue);
 218                 return NULL;
 219         }
 220         curfragnum++;
 221         plist = &defrag_q->queue;
 222         plist = plist->next;
 223         while (!end_of_queue_search(phead, plist)) {
 224                 pnextrframe = container_of(plist, union recv_frame, u.list);
 225                 pnfhdr = &pnextrframe->u.hdr;
 226                 /*check the fragment sequence  (2nd ~n fragment frame) */
 227                 if (curfragnum != pnfhdr->attrib.frag_num) {
 228                         /* the fragment number must increase  (after decache)
 229                          * release the defrag_q & prframe
 230                          */
 231                         r8712_free_recvframe(prframe, pfree_recv_queue);
 232                         r8712_free_recvframe_queue(defrag_q, pfree_recv_queue);
 233                         return NULL;
 234                 }
 235                 curfragnum++;
 236                 /* copy the 2nd~n fragment frame's payload to the first fragment
 237                  * get the 2nd~last fragment frame's payload
 238                  */
 239                 wlanhdr_offset = pnfhdr->attrib.hdrlen + pnfhdr->attrib.iv_len;
 240                 recvframe_pull(pnextrframe, wlanhdr_offset);
 241                 /* append  to first fragment frame's tail (if privacy frame,
 242                  * pull the ICV)
 243                  */
 244                 recvframe_pull_tail(prframe, pfhdr->attrib.icv_len);
 245                 memcpy(pfhdr->rx_tail, pnfhdr->rx_data, pnfhdr->len);
 246                 recvframe_put(prframe, pnfhdr->len);
 247                 pfhdr->attrib.icv_len = pnfhdr->attrib.icv_len;
 248                 plist = plist->next;
 249         }
 250         /* free the defrag_q queue and return the prframe */
 251         r8712_free_recvframe_queue(defrag_q, pfree_recv_queue);
 252         return prframe;
 253 }
 254
 255 /* check if need to defrag, if needed queue the frame to defrag_q */
 256 union recv_frame *r8712_recvframe_chk_defrag(struct _adapter *padapter,
 257                                              union recv_frame *precv_frame)
 258 {
 259         u8      ismfrag;
 260         u8      fragnum;
 261         u8   *psta_addr;
 262         struct recv_frame_hdr *pfhdr;
 263         struct sta_info *psta;
 264         struct  sta_priv *pstapriv;
 265         struct list_head *phead;
 266         union recv_frame *prtnframe = NULL;
 267         struct  __queue *pfree_recv_queue, *pdefrag_q;
 268
 269         pstapriv = &padapter->stapriv;
 270         pfhdr = &precv_frame->u.hdr;
 271         pfree_recv_queue = &padapter->recvpriv.free_recv_queue;
 272         /* need to define struct of wlan header frame ctrl */
 273         ismfrag = pfhdr->attrib.mfrag;
 274         fragnum = pfhdr->attrib.frag_num;
 275         psta_addr = pfhdr->attrib.ta;
 276         psta = r8712_get_stainfo(pstapriv, psta_addr);
 277         if (!psta)
 278                 pdefrag_q = NULL;
 279         else
 280                 pdefrag_q = &psta->sta_recvpriv.defrag_q;
 281
 282         if ((ismfrag == 0) && (fragnum == 0))
 283                 prtnframe = precv_frame;/*isn't a fragment frame*/
 284         if (ismfrag == 1) {
 285                 /* 0~(n-1) fragment frame
 286                  * enqueue to defraf_g
 287                  */
 288                 if (pdefrag_q != NULL) {
 289                         if (fragnum == 0) {
 290                                 /*the first fragment*/
 291                                 if (!list_empty(&pdefrag_q->queue)) {
 292                                         /*free current defrag_q */
 293                                         r8712_free_recvframe_queue(pdefrag_q,
 294                                                              pfree_recv_queue);
 295                                 }
 296                         }
 297                         /* Then enqueue the 0~(n-1) fragment to the defrag_q */
 298                         phead = &pdefrag_q->queue;
 299                         list_add_tail(&pfhdr->list, phead);
 300                         prtnframe = NULL;
 301                 } else {
 302                         /* can't find this ta's defrag_queue, so free this
 303                          * recv_frame
 304                          */
 305                         r8712_free_recvframe(precv_frame, pfree_recv_queue);
 306                         prtnframe = NULL;
 307                 }
 308
 309         }
 310         if ((ismfrag == 0) && (fragnum != 0)) {
 311                 /* the last fragment frame
 312                  * enqueue the last fragment
 313                  */
 314                 if (pdefrag_q != NULL) {
 315                         phead = &pdefrag_q->queue;
 316                         list_add_tail(&pfhdr->list, phead);
 317                         /*call recvframe_defrag to defrag*/
 318                         precv_frame = recvframe_defrag(padapter, pdefrag_q);
 319                         prtnframe = precv_frame;
 320                 } else {
 321                         /* can't find this ta's defrag_queue, so free this
 322                          *  recv_frame
 323                          */
 324                         r8712_free_recvframe(precv_frame, pfree_recv_queue);
 325                         prtnframe = NULL;
 326                 }
 327         }
 328         if ((prtnframe != NULL) && (prtnframe->u.hdr.attrib.privacy)) {
 329                 /* after defrag we must check tkip mic code */
 330                 if (r8712_recvframe_chkmic(padapter, prtnframe) == _FAIL) {
 331                         r8712_free_recvframe(prtnframe, pfree_recv_queue);
 332                         prtnframe = NULL;
 333                 }
 334         }
 335         return prtnframe;
 336 }
 337
 338 static int amsdu_to_msdu(struct _adapter *padapter, union recv_frame *prframe)
 339 {
 340         int     a_len, padding_len;
 341         u16     eth_type, nSubframe_Length;
 342         u8      nr_subframes, i;
 343         unsigned char *data_ptr, *pdata;
 344         struct rx_pkt_attrib *pattrib;
 345         _pkt *sub_skb, *subframes[MAX_SUBFRAME_COUNT];
 346         struct recv_priv *precvpriv = &padapter->recvpriv;
 347         struct  __queue *pfree_recv_queue = &(precvpriv->free_recv_queue);
 348
 349         nr_subframes = 0;
 350         pattrib = &prframe->u.hdr.attrib;
 351         recvframe_pull(prframe, prframe->u.hdr.attrib.hdrlen);
 352         if (prframe->u.hdr.attrib.iv_len > 0)
 353                 recvframe_pull(prframe, prframe->u.hdr.attrib.iv_len);
 354         a_len = prframe->u.hdr.len;
 355         pdata = prframe->u.hdr.rx_data;
 356         while (a_len > ETH_HLEN) {
 357                 /* Offset 12 denote 2 mac address */
 358                 nSubframe_Length = *((u16 *)(pdata + 12));
 359                 /*==m==>change the length order*/
 360                 nSubframe_Length = (nSubframe_Length >> 8) +
 361                                    (nSubframe_Length << 8);
 362                 if (a_len < (ETHERNET_HEADER_SIZE + nSubframe_Length)) {
 363                         netdev_warn(padapter->pnetdev, "r8712u: nRemain_Length is %d and nSubframe_Length is: %d\n",
 364                                     a_len, nSubframe_Length);
 365                         goto exit;
 366                 }
 367                 /* move the data point to data content */
 368                 pdata += ETH_HLEN;
 369                 a_len -= ETH_HLEN;
 370                 /* Allocate new skb for releasing to upper layer */
 371                 sub_skb = dev_alloc_skb(nSubframe_Length + 12);
 372                 if (!sub_skb)
 373                         break;
 374                 skb_reserve(sub_skb, 12);
 375                 data_ptr = (u8 *)skb_put(sub_skb, nSubframe_Length);
 376                 memcpy(data_ptr, pdata, nSubframe_Length);
 377                 subframes[nr_subframes++] = sub_skb;
 378                 if (nr_subframes >= MAX_SUBFRAME_COUNT) {
 379                         netdev_warn(padapter->pnetdev, "r8712u: ParseSubframe(): Too many Subframes! Packets dropped!\n");
 380                         break;
 381                 }
 382                 pdata += nSubframe_Length;
 383                 a_len -= nSubframe_Length;
 384                 if (a_len != 0) {
 385                         padding_len = 4 - ((nSubframe_Length + ETH_HLEN) & 3);
 386                         if (padding_len == 4)
 387                                 padding_len = 0;
 388                         if (a_len < padding_len)
 389                                 goto exit;
 390                         pdata += padding_len;
 391                         a_len -= padding_len;
 392                 }
 393         }
 394         for (i = 0; i < nr_subframes; i++) {
 395                 sub_skb = subframes[i];
 396                 /* convert hdr + possible LLC headers into Ethernet header */
 397                 eth_type = (sub_skb->data[6] << 8) | sub_skb->data[7];
 398                 if (sub_skb->len >= 8 &&
 399                    ((!memcmp(sub_skb->data, rfc1042_header, SNAP_SIZE) &&
 400                    eth_type != ETH_P_AARP && eth_type != ETH_P_IPX) ||
 401                    !memcmp(sub_skb->data, bridge_tunnel_header, SNAP_SIZE))) {
 402                         /* remove RFC1042 or Bridge-Tunnel encapsulation and
 403                          * replace EtherType
 404                          */
 405                         skb_pull(sub_skb, SNAP_SIZE);
 406                         memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->src,
 407                                 ETH_ALEN);
 408                         memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->dst,
 409                                 ETH_ALEN);
 410                 } else {
 411                         u16 len;
 412                         /* Leave Ethernet header part of hdr and full payload */
 413                         len = htons(sub_skb->len);
 414                         memcpy(skb_push(sub_skb, 2), &len, 2);
 415                         memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->src,
 416                                 ETH_ALEN);
 417                         memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->dst,
 418                                 ETH_ALEN);
 419                 }
 420                 /* Indicate the packets to upper layer */
 421                 if (sub_skb) {
 422                         sub_skb->protocol =
 423                                  eth_type_trans(sub_skb, padapter->pnetdev);
 424                         sub_skb->dev = padapter->pnetdev;
 425                         if ((pattrib->tcpchk_valid == 1) &&
 426                             (pattrib->tcp_chkrpt == 1)) {
 427                                 sub_skb->ip_summed = CHECKSUM_UNNECESSARY;
 428                         } else {
 429                                 sub_skb->ip_summed = CHECKSUM_NONE;
 430                         }
 431                         netif_rx(sub_skb);
 432                 }
 433         }
 434 exit:
 435         prframe->u.hdr.len = 0;
 436         r8712_free_recvframe(prframe, pfree_recv_queue);
 437         return _SUCCESS;
 438 }
 439
 440 void r8712_rxcmd_event_hdl(struct _adapter *padapter, void *prxcmdbuf)
 441 {
 442         uint voffset;
 443         u8 *poffset;
 444         u16 cmd_len, drvinfo_sz;
 445         struct recv_stat *prxstat;
 446
 447         poffset = (u8 *)prxcmdbuf;
 448         voffset = *(uint *)poffset;
 449         prxstat = (struct recv_stat *)prxcmdbuf;
 450         drvinfo_sz = (le32_to_cpu(prxstat->rxdw0) & 0x000f0000) >> 16;
 451         drvinfo_sz <<= 3;
 452         poffset += RXDESC_SIZE + drvinfo_sz;
 453         do {
 454                 voffset  = *(uint *)poffset;
 455                 cmd_len = (u16)(le32_to_cpu(voffset) & 0xffff);
 456                 r8712_event_handle(padapter, (uint *)poffset);
 457                 poffset += (cmd_len + 8);/*8 bytes alignment*/
 458         } while (le32_to_cpu(voffset) & BIT(31));
 459
 460 }
 461
 462 static int check_indicate_seq(struct recv_reorder_ctrl *preorder_ctrl,
 463                               u16 seq_num)
 464 {
 465         u8 wsize = preorder_ctrl->wsize_b;
 466         u16 wend = (preorder_ctrl->indicate_seq + wsize - 1) % 4096;
 467
 468         /* Rx Reorder initialize condition.*/
 469         if (preorder_ctrl->indicate_seq == 0xffff)
 470                 preorder_ctrl->indicate_seq = seq_num;
 471         /* Drop out the packet which SeqNum is smaller than WinStart */
 472         if (SN_LESS(seq_num, preorder_ctrl->indicate_seq))
 473                 return false;
 474         /*
 475          * Sliding window manipulation. Conditions includes:
 476          * 1. Incoming SeqNum is equal to WinStart =>Window shift 1
 477          * 2. Incoming SeqNum is larger than the WinEnd => Window shift N
 478          */
 479         if (SN_EQUAL(seq_num, preorder_ctrl->indicate_seq))
 480                 preorder_ctrl->indicate_seq = (preorder_ctrl->indicate_seq +
 481                                               1) % 4096;
 482         else if (SN_LESS(wend, seq_num)) {
 483                 if (seq_num >= (wsize - 1))
 484                         preorder_ctrl->indicate_seq = seq_num + 1 - wsize;
 485                 else
 486                         preorder_ctrl->indicate_seq = 4095 - (wsize -
 487                                                       (seq_num + 1)) + 1;
 488         }
 489         return true;
 490 }
 491
 492 static int enqueue_reorder_recvframe(struct recv_reorder_ctrl *preorder_ctrl,
 493                               union recv_frame *prframe)
 494 {
 495         struct list_head *phead, *plist;
 496         union recv_frame *pnextrframe;
 497         struct rx_pkt_attrib *pnextattrib;
 498         struct  __queue *ppending_recvframe_queue =
 499                                         &preorder_ctrl->pending_recvframe_queue;
 500         struct rx_pkt_attrib *pattrib = &prframe->u.hdr.attrib;
 501
 502         phead = &ppending_recvframe_queue->queue;
 503         plist = phead->next;
 504         while (!end_of_queue_search(phead, plist)) {
 505                 pnextrframe = container_of(plist, union recv_frame, u.list);
 506                 pnextattrib = &pnextrframe->u.hdr.attrib;
 507                 if (SN_LESS(pnextattrib->seq_num, pattrib->seq_num))
 508                         plist = plist->next;
 509                 else if (SN_EQUAL(pnextattrib->seq_num, pattrib->seq_num))
 510                         return false;
 511                 else
 512                         break;
 513         }
 514         list_del_init(&(prframe->u.hdr.list));
 515         list_add_tail(&(prframe->u.hdr.list), plist);
 516         return true;
 517 }
 518
 519 int r8712_recv_indicatepkts_in_order(struct _adapter *padapter,
 520                                struct recv_reorder_ctrl *preorder_ctrl,
 521                                int bforced)
 522 {
 523         struct list_head *phead, *plist;
 524         union recv_frame *prframe;
 525         struct rx_pkt_attrib *pattrib;
 526         int bPktInBuf = false;
 527         struct recv_priv *precvpriv = &padapter->recvpriv;
 528         struct  __queue *ppending_recvframe_queue =
 529                          &preorder_ctrl->pending_recvframe_queue;
 530
 531         phead = &ppending_recvframe_queue->queue;
 532         plist = phead->next;
 533         /* Handling some condition for forced indicate case.*/
 534         if (bforced) {
 535                 if (list_empty(phead))
 536                         return true;
 537
 538                 prframe = container_of(plist, union recv_frame, u.list);
 539                 pattrib = &prframe->u.hdr.attrib;
 540                 preorder_ctrl->indicate_seq = pattrib->seq_num;
 541         }
 542         /* Prepare indication list and indication.
 543          * Check if there is any packet need indicate.
 544          */
 545         while (!list_empty(phead)) {
 546                 prframe = container_of(plist, union recv_frame, u.list);
 547                 pattrib = &prframe->u.hdr.attrib;
 548                 if (!SN_LESS(preorder_ctrl->indicate_seq, pattrib->seq_num)) {
 549                         plist = plist->next;
 550                         list_del_init(&(prframe->u.hdr.list));
 551                         if (SN_EQUAL(preorder_ctrl->indicate_seq,
 552                             pattrib->seq_num))
 553                                 preorder_ctrl->indicate_seq =
 554                                   (preorder_ctrl->indicate_seq + 1) % 4096;
 555                         /*indicate this recv_frame*/
 556                         if (!pattrib->amsdu) {
 557                                 if (!padapter->bDriverStopped &&
 558                                     !padapter->bSurpriseRemoved) {
 559                                         /* indicate this recv_frame */
 560                                         r8712_recv_indicatepkt(padapter,
 561                                                                prframe);
 562                                 }
 563                         } else if (pattrib->amsdu == 1) {
 564                                 if (amsdu_to_msdu(padapter, prframe) !=
 565                                     _SUCCESS)
 566                                         r8712_free_recvframe(prframe,
 567                                                    &precvpriv->free_recv_queue);
 568                         }
 569                         /* Update local variables. */
 570                         bPktInBuf = false;
 571                 } else {
 572                         bPktInBuf = true;
 573                         break;
 574                 }
 575         }
 576         return bPktInBuf;
 577 }
 578
 579 static int recv_indicatepkt_reorder(struct _adapter *padapter,
 580                              union recv_frame *prframe)
 581 {
 582         unsigned long irql;
 583         struct rx_pkt_attrib *pattrib = &prframe->u.hdr.attrib;
 584         struct recv_reorder_ctrl *preorder_ctrl = prframe->u.hdr.preorder_ctrl;
 585         struct  __queue *ppending_recvframe_queue =
 586                          &preorder_ctrl->pending_recvframe_queue;
 587
 588         if (!pattrib->amsdu) {
 589                 /* s1. */
 590                 r8712_wlanhdr_to_ethhdr(prframe);
 591                 if (pattrib->qos != 1) {
 592                         if (!padapter->bDriverStopped &&
 593                             !padapter->bSurpriseRemoved) {
 594                                 r8712_recv_indicatepkt(padapter, prframe);
 595                                 return _SUCCESS;
 596                         } else {
 597                                 return _FAIL;
 598                         }
 599                 }
 600         }
 601         spin_lock_irqsave(&ppending_recvframe_queue->lock, irql);
 602         /*s2. check if winstart_b(indicate_seq) needs to be updated*/
 603         if (!check_indicate_seq(preorder_ctrl, pattrib->seq_num))
 604                 goto _err_exit;
 605         /*s3. Insert all packet into Reorder Queue to maintain its ordering.*/
 606         if (!enqueue_reorder_recvframe(preorder_ctrl, prframe))
 607                 goto _err_exit;
 608         /*s4.
 609          * Indication process.
 610          * After Packet dropping and Sliding Window shifting as above, we can
 611          * now just indicate the packets with the SeqNum smaller than latest
 612          * WinStart and buffer other packets.
 613          *
 614          * For Rx Reorder condition:
 615          * 1. All packets with SeqNum smaller than WinStart => Indicate
 616          * 2. All packets with SeqNum larger than or equal to
 617          * WinStart => Buffer it.
 618          */
 619         if (r8712_recv_indicatepkts_in_order(padapter, preorder_ctrl, false) ==
 620             true) {
 621                 mod_timer(&preorder_ctrl->reordering_ctrl_timer,
 622                           jiffies + msecs_to_jiffies(REORDER_WAIT_TIME));
 623                 spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
 624         } else {
 625                 spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
 626                 del_timer(&preorder_ctrl->reordering_ctrl_timer);
 627         }
 628         return _SUCCESS;
 629 _err_exit:
 630         spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
 631         return _FAIL;
 632 }
 633
 634 void r8712_reordering_ctrl_timeout_handler(void *pcontext)
 635 {
 636         unsigned long irql;
 637         struct recv_reorder_ctrl *preorder_ctrl =
 638                                  (struct recv_reorder_ctrl *)pcontext;
 639         struct _adapter *padapter = preorder_ctrl->padapter;
 640         struct  __queue *ppending_recvframe_queue =
 641                                  &preorder_ctrl->pending_recvframe_queue;
 642
 643         if (padapter->bDriverStopped || padapter->bSurpriseRemoved)
 644                 return;
 645         spin_lock_irqsave(&ppending_recvframe_queue->lock, irql);
 646         r8712_recv_indicatepkts_in_order(padapter, preorder_ctrl, true);
 647         spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
 648 }
 649
 650 static int r8712_process_recv_indicatepkts(struct _adapter *padapter,
 651                               union recv_frame *prframe)
 652 {
 653         int retval = _SUCCESS;
 654         struct mlme_priv *pmlmepriv = &padapter->mlmepriv;
 655         struct ht_priv  *phtpriv = &pmlmepriv->htpriv;
 656
 657         if (phtpriv->ht_option == 1) { /*B/G/N Mode*/
 658                 if (recv_indicatepkt_reorder(padapter, prframe) != _SUCCESS) {
 659                         /* including perform A-MPDU Rx Ordering Buffer Control*/
 660                         if (!padapter->bDriverStopped &&
 661                             !padapter->bSurpriseRemoved)
 662                                 return _FAIL;
 663                 }
 664         } else { /*B/G mode*/
 665                 retval = r8712_wlanhdr_to_ethhdr(prframe);
 666                 if (retval != _SUCCESS)
 667                         return retval;
 668                 if (!padapter->bDriverStopped && !padapter->bSurpriseRemoved) {
 669                         /* indicate this recv_frame */
 670                         r8712_recv_indicatepkt(padapter, prframe);
 671                 } else {
 672                         return _FAIL;
 673                 }
 674         }
 675         return retval;
 676 }
 677
 678 static u8 query_rx_pwr_percentage(s8 antpower)
 679 {
 680         if ((antpower <= -100) || (antpower >= 20))
 681                 return  0;
 682         else if (antpower >= 0)
 683                 return  100;
 684         else
 685                 return 100 + antpower;
 686 }
 687
 688 static u8 evm_db2percentage(s8 value)
 689 {
 690         /*
 691          * -33dB~0dB to 0%~99%
 692          */
 693         s8 ret_val;
 694
 695         ret_val = value;
 696         if (ret_val >= 0)
 697                 ret_val = 0;
 698         if (ret_val <= -33)
 699                 ret_val = -33;
 700         ret_val = -ret_val;
 701         ret_val *= 3;
 702         if (ret_val == 99)
 703                 ret_val = 100;
 704         return ret_val;
 705 }
 706
 707 s32 r8712_signal_scale_mapping(s32 cur_sig)
 708 {
 709         s32 ret_sig;
 710
 711         if (cur_sig >= 51 && cur_sig <= 100)
 712                 ret_sig = 100;
 713         else if (cur_sig >= 41 && cur_sig <= 50)
 714                 ret_sig = 80 + ((cur_sig - 40) * 2);
 715         else if (cur_sig >= 31 && cur_sig <= 40)
 716                 ret_sig = 66 + (cur_sig - 30);
 717         else if (cur_sig >= 21 && cur_sig <= 30)
 718                 ret_sig = 54 + (cur_sig - 20);
 719         else if (cur_sig >= 10 && cur_sig <= 20)
 720                 ret_sig = 42 + (((cur_sig - 10) * 2) / 3);
 721         else if (cur_sig >= 5 && cur_sig <= 9)
 722                 ret_sig = 22 + (((cur_sig - 5) * 3) / 2);
 723         else if (cur_sig >= 1 && cur_sig <= 4)
 724                 ret_sig = 6 + (((cur_sig - 1) * 3) / 2);
 725         else
 726                 ret_sig = cur_sig;
 727         return ret_sig;
 728 }
 729
 730 static s32  translate2dbm(struct _adapter *padapter, u8 signal_strength_idx)
 731 {
 732         s32 signal_power; /* in dBm.*/
 733         /* Translate to dBm (x=0.5y-95).*/
 734         signal_power = (s32)((signal_strength_idx + 1) >> 1);
 735         signal_power -= 95;
 736         return signal_power;
 737 }
 738
 739 static void query_rx_phy_status(struct _adapter *padapter,
 740                                 union recv_frame *prframe)
 741 {
 742         u8 i, max_spatial_stream, evm;
 743         struct recv_stat *prxstat = (struct recv_stat *)prframe->u.hdr.rx_head;
 744         struct phy_stat *pphy_stat = (struct phy_stat *)(prxstat + 1);
 745         u8 *pphy_head = (u8 *)(prxstat + 1);
 746         s8 rx_pwr[4], rx_pwr_all;
 747         u8 pwdb_all;
 748         u32 rssi, total_rssi = 0;
 749         u8 bcck_rate = 0, rf_rx_num = 0, cck_highpwr = 0;
 750         struct phy_cck_rx_status *pcck_buf;
 751         u8 sq;
 752
 753         /* Record it for next packet processing*/
 754         bcck_rate = (prframe->u.hdr.attrib.mcs_rate <= 3 ? 1 : 0);
 755         if (bcck_rate) {
 756                 u8 report;
 757
 758                 /* CCK Driver info Structure is not the same as OFDM packet.*/
 759                 pcck_buf = (struct phy_cck_rx_status *)pphy_stat;
 760                 /* (1)Hardware does not provide RSSI for CCK
 761                  * (2)PWDB, Average PWDB cacluated by hardware
 762                  * (for rate adaptive)
 763                  */
 764                 if (!cck_highpwr) {
 765                         report = pcck_buf->cck_agc_rpt & 0xc0;
 766                         report >>= 6;
 767                         switch (report) {
 768                         /* Modify the RF RNA gain value to -40, -20,
 769                          * -2, 14 by Jenyu's suggestion
 770                          * Note: different RF with the different
 771                          * RNA gain.
 772                          */
 773                         case 0x3:
 774                                 rx_pwr_all = -40 - (pcck_buf->cck_agc_rpt &
 775                                              0x3e);
 776                                 break;
 777                         case 0x2:
 778                                 rx_pwr_all = -20 - (pcck_buf->cck_agc_rpt &
 779                                              0x3e);
 780                                 break;
 781                         case 0x1:
 782                                 rx_pwr_all = -2 - (pcck_buf->cck_agc_rpt &
 783                                              0x3e);
 784                                 break;
 785                         case 0x0:
 786                                 rx_pwr_all = 14 - (pcck_buf->cck_agc_rpt &
 787                                              0x3e);
 788                                 break;
 789                         }
 790                 } else {
 791                         report = ((u8)(le32_to_cpu(pphy_stat->phydw1) >> 8)) &
 792                                  0x60;
 793                         report >>= 5;
 794                         switch (report) {
 795                         case 0x3:
 796                                 rx_pwr_all = -40 - ((pcck_buf->cck_agc_rpt &
 797                                              0x1f) << 1);
 798                                 break;
 799                         case 0x2:
 800                                 rx_pwr_all = -20 - ((pcck_buf->cck_agc_rpt &
 801                                              0x1f) << 1);
 802                                 break;
 803                         case 0x1:
 804                                 rx_pwr_all = -2 - ((pcck_buf->cck_agc_rpt &
 805                                              0x1f) << 1);
 806                                 break;
 807                         case 0x0:
 808                                 rx_pwr_all = 14 - ((pcck_buf->cck_agc_rpt &
 809                                              0x1f) << 1);
 810                                 break;
 811                         }
 812                 }
 813                 pwdb_all = query_rx_pwr_percentage(rx_pwr_all);
 814                 /* CCK gain is smaller than OFDM/MCS gain,*/
 815                 /* so we add gain diff by experiences, the val is 6 */
 816                 pwdb_all += 6;
 817                 if (pwdb_all > 100)
 818                         pwdb_all = 100;
 819                 /* modify the offset to make the same gain index with OFDM.*/
 820                 if (pwdb_all > 34 && pwdb_all <= 42)
 821                         pwdb_all -= 2;
 822                 else if (pwdb_all > 26 && pwdb_all <= 34)
 823                         pwdb_all -= 6;
 824                 else if (pwdb_all > 14 && pwdb_all <= 26)
 825                         pwdb_all -= 8;
 826                 else if (pwdb_all > 4 && pwdb_all <= 14)
 827                         pwdb_all -= 4;
 828                 /*
 829                  * (3) Get Signal Quality (EVM)
 830                  */
 831                 if (pwdb_all > 40) {
 832                         sq = 100;
 833                 } else {
 834                         sq = pcck_buf->sq_rpt;
 835                         if (pcck_buf->sq_rpt > 64)
 836                                 sq = 0;
 837                         else if (pcck_buf->sq_rpt < 20)
 838                                 sq = 100;
 839                         else
 840                                 sq = ((64 - sq) * 100) / 44;
 841                 }
 842                 prframe->u.hdr.attrib.signal_qual = sq;
 843                 prframe->u.hdr.attrib.rx_mimo_signal_qual[0] = sq;
 844                 prframe->u.hdr.attrib.rx_mimo_signal_qual[1] = -1;
 845         } else {
 846                 /* (1)Get RSSI for HT rate */
 847                 for (i = 0; i < ((padapter->registrypriv.rf_config) &
 848                             0x0f); i++) {
 849                         rf_rx_num++;
 850                         rx_pwr[i] = ((pphy_head[PHY_STAT_GAIN_TRSW_SHT + i]
 851                                     & 0x3F) * 2) - 110;
 852                         /* Translate DBM to percentage. */
 853                         rssi = query_rx_pwr_percentage(rx_pwr[i]);
 854                         total_rssi += rssi;
 855                 }
 856                 /* (2)PWDB, Average PWDB cacluated by hardware (for
 857                  * rate adaptive)
 858                  */
 859                 rx_pwr_all = (((pphy_head[PHY_STAT_PWDB_ALL_SHT]) >> 1) & 0x7f)
 860                              - 106;
 861                 pwdb_all = query_rx_pwr_percentage(rx_pwr_all);
 862
 863                 {
 864                         /* (3)EVM of HT rate */
 865                         if (prframe->u.hdr.attrib.htc &&
 866                             prframe->u.hdr.attrib.mcs_rate >= 20 &&
 867                             prframe->u.hdr.attrib.mcs_rate <= 27) {
 868                                 /* both spatial stream make sense */
 869                                 max_spatial_stream = 2;
 870                         } else {
 871                                 /* only spatial stream 1 makes sense */
 872                                 max_spatial_stream = 1;
 873                         }
 874                         for (i = 0; i < max_spatial_stream; i++) {
 875                                 evm = evm_db2percentage((pphy_head
 876                                       [PHY_STAT_RXEVM_SHT + i]));/*dbm*/
 877                                 prframe->u.hdr.attrib.signal_qual =
 878                                          (u8)(evm & 0xff);
 879                                 prframe->u.hdr.attrib.rx_mimo_signal_qual[i] =
 880                                          (u8)(evm & 0xff);
 881                         }
 882                 }
 883         }
 884         /* UI BSS List signal strength(in percentage), make it good looking,
 885          * from 0~100. It is assigned to the BSS List in
 886          * GetValueFromBeaconOrProbeRsp().
 887          */
 888         if (bcck_rate)
 889                 prframe->u.hdr.attrib.signal_strength =
 890                          (u8)r8712_signal_scale_mapping(pwdb_all);
 891         else {
 892                 if (rf_rx_num != 0)
 893                         prframe->u.hdr.attrib.signal_strength =
 894                                  (u8)(r8712_signal_scale_mapping(total_rssi /=
 895                                  rf_rx_num));
 896         }
 897 }
 898
 899 static void process_link_qual(struct _adapter *padapter,
 900                               union recv_frame *prframe)
 901 {
 902         u32     last_evm = 0, tmpVal;
 903         struct rx_pkt_attrib *pattrib;
 904
 905         if (prframe == NULL || padapter == NULL)
 906                 return;
 907         pattrib = &prframe->u.hdr.attrib;
 908         if (pattrib->signal_qual != 0) {
 909                 /*
 910                  * 1. Record the general EVM to the sliding window.
 911                  */
 912                 if (padapter->recvpriv.signal_qual_data.total_num++ >=
 913                                   PHY_LINKQUALITY_SLID_WIN_MAX) {
 914                         padapter->recvpriv.signal_qual_data.total_num =
 915                                   PHY_LINKQUALITY_SLID_WIN_MAX;
 916                         last_evm = padapter->recvpriv.signal_qual_data.elements
 917                                   [padapter->recvpriv.signal_qual_data.index];
 918                         padapter->recvpriv.signal_qual_data.total_val -=
 919                                   last_evm;
 920                 }
 921                 padapter->recvpriv.signal_qual_data.total_val +=
 922                           pattrib->signal_qual;
 923                 padapter->recvpriv.signal_qual_data.elements[padapter->
 924                           recvpriv.signal_qual_data.index++] =
 925                           pattrib->signal_qual;
 926                 if (padapter->recvpriv.signal_qual_data.index >=
 927                     PHY_LINKQUALITY_SLID_WIN_MAX)
 928                         padapter->recvpriv.signal_qual_data.index = 0;
 929
 930                 /* <1> Showed on UI for user, in percentage. */
 931                 tmpVal = padapter->recvpriv.signal_qual_data.total_val /
 932                          padapter->recvpriv.signal_qual_data.total_num;
 933                 padapter->recvpriv.signal = (u8)tmpVal;
 934         }
 935 }
 936
 937 static void process_rssi(struct _adapter *padapter, union recv_frame *prframe)
 938 {
 939         u32 last_rssi, tmp_val;
 940         struct rx_pkt_attrib *pattrib = &prframe->u.hdr.attrib;
 941
 942         if (padapter->recvpriv.signal_strength_data.total_num++ >=
 943             PHY_RSSI_SLID_WIN_MAX) {
 944                 padapter->recvpriv.signal_strength_data.total_num =
 945                          PHY_RSSI_SLID_WIN_MAX;
 946                 last_rssi = padapter->recvpriv.signal_strength_data.elements
 947                             [padapter->recvpriv.signal_strength_data.index];
 948                 padapter->recvpriv.signal_strength_data.total_val -= last_rssi;
 949         }
 950         padapter->recvpriv.signal_strength_data.total_val +=
 951                         pattrib->signal_strength;
 952         padapter->recvpriv.signal_strength_data.elements[padapter->recvpriv.
 953                         signal_strength_data.index++] =
 954                         pattrib->signal_strength;
 955         if (padapter->recvpriv.signal_strength_data.index >=
 956             PHY_RSSI_SLID_WIN_MAX)
 957                 padapter->recvpriv.signal_strength_data.index = 0;
 958         tmp_val = padapter->recvpriv.signal_strength_data.total_val /
 959                   padapter->recvpriv.signal_strength_data.total_num;
 960         padapter->recvpriv.rssi = (s8)translate2dbm(padapter, (u8)tmp_val);
 961 }
 962
 963 static void process_phy_info(struct _adapter *padapter,
 964                              union recv_frame *prframe)
 965 {
 966         query_rx_phy_status(padapter, prframe);
 967         process_rssi(padapter, prframe);
 968         process_link_qual(padapter,  prframe);
 969 }
 970
 971 int recv_func(struct _adapter *padapter, void *pcontext)
 972 {
 973         struct rx_pkt_attrib *pattrib;
 974         union recv_frame *prframe, *orig_prframe;
 975         int retval = _SUCCESS;
 976         struct  __queue *pfree_recv_queue = &padapter->recvpriv.free_recv_queue;
 977         struct  mlme_priv       *pmlmepriv = &padapter->mlmepriv;
 978
 979         prframe = (union recv_frame *)pcontext;
 980         orig_prframe = prframe;
 981         pattrib = &prframe->u.hdr.attrib;
 982         if (check_fwstate(pmlmepriv, WIFI_MP_STATE)) {
 983                 if (pattrib->crc_err == 1)
 984                         padapter->mppriv.rx_crcerrpktcount++;
 985                 else
 986                         padapter->mppriv.rx_pktcount++;
 987                 if (!check_fwstate(pmlmepriv, WIFI_MP_LPBK_STATE)) {
 988                         /* free this recv_frame */
 989                         r8712_free_recvframe(orig_prframe, pfree_recv_queue);
 990                         goto _exit_recv_func;
 991                 }
 992         }
 993         /* check the frame crtl field and decache */
 994         retval = r8712_validate_recv_frame(padapter, prframe);
 995         if (retval != _SUCCESS) {
 996                 /* free this recv_frame */
 997                 r8712_free_recvframe(orig_prframe, pfree_recv_queue);
 998                 goto _exit_recv_func;
 999         }
1000         process_phy_info(padapter, prframe);
1001         prframe = r8712_decryptor(padapter, prframe);
1002         if (!prframe) {
1003                 retval = _FAIL;
1004                 goto _exit_recv_func;
1005         }
1006         prframe = r8712_recvframe_chk_defrag(padapter, prframe);
1007         if (!prframe)
1008                 goto _exit_recv_func;
1009         prframe = r8712_portctrl(padapter, prframe);
1010         if (!prframe) {
1011                 retval = _FAIL;
1012                 goto _exit_recv_func;
1013         }
1014         retval = r8712_process_recv_indicatepkts(padapter, prframe);
1015         if (retval != _SUCCESS) {
1016                 r8712_free_recvframe(orig_prframe, pfree_recv_queue);
1017                 goto _exit_recv_func;
1018         }
1019 _exit_recv_func:
1020         return retval;
1021 }
1022
1023 static int recvbuf2recvframe(struct _adapter *padapter, struct sk_buff *pskb)
1024 {
1025         u8 *pbuf, shift_sz = 0;
1026         u8      frag, mf;
1027         uint    pkt_len;
1028         u32 transfer_len;
1029         struct recv_stat *prxstat;
1030         u16     pkt_cnt, drvinfo_sz, pkt_offset, tmp_len, alloc_sz;
1031         struct  __queue *pfree_recv_queue;
1032         _pkt  *pkt_copy = NULL;
1033         union recv_frame *precvframe = NULL;
1034         struct recv_priv *precvpriv = &padapter->recvpriv;
1035
1036         pfree_recv_queue = &(precvpriv->free_recv_queue);
1037         pbuf = pskb->data;
1038         prxstat = (struct recv_stat *)pbuf;
1039         pkt_cnt = (le32_to_cpu(prxstat->rxdw2) >> 16) & 0xff;
1040         pkt_len =  le32_to_cpu(prxstat->rxdw0) & 0x00003fff;
1041         transfer_len = pskb->len;
1042         /* Test throughput with Netgear 3700 (No security) with Chariot 3T3R
1043          * pairs. The packet count will be a big number so that the containing
1044          * packet will effect the Rx reordering.
1045          */
1046         if (transfer_len < pkt_len) {
1047                 /* In this case, it means the MAX_RECVBUF_SZ is too small to
1048                  * get the data from 8712u.
1049                  */
1050                 return _FAIL;
1051         }
1052         do {
1053                 prxstat = (struct recv_stat *)pbuf;
1054                 pkt_len =  le32_to_cpu(prxstat->rxdw0) & 0x00003fff;
1055                 /* more fragment bit */
1056                 mf = (le32_to_cpu(prxstat->rxdw1) >> 27) & 0x1;
1057                 /* ragmentation number */
1058                 frag = (le32_to_cpu(prxstat->rxdw2) >> 12) & 0xf;
1059                 /* uint 2^3 = 8 bytes */
1060                 drvinfo_sz = (le32_to_cpu(prxstat->rxdw0) & 0x000f0000) >> 16;
1061                 drvinfo_sz <<= 3;
1062                 if (pkt_len <= 0)
1063                         goto  _exit_recvbuf2recvframe;
1064                 /* Qos data, wireless lan header length is 26 */
1065                 if ((le32_to_cpu(prxstat->rxdw0) >> 23) & 0x01)
1066                         shift_sz = 2;
1067                 precvframe = r8712_alloc_recvframe(pfree_recv_queue);
1068                 if (!precvframe)
1069                         goto  _exit_recvbuf2recvframe;
1070                 INIT_LIST_HEAD(&precvframe->u.hdr.list);
1071                 precvframe->u.hdr.precvbuf = NULL; /*can't access the precvbuf*/
1072                 precvframe->u.hdr.len = 0;
1073                 tmp_len = pkt_len + drvinfo_sz + RXDESC_SIZE;
1074                 pkt_offset = (u16)round_up(tmp_len, 128);
1075                 /* for first fragment packet, driver need allocate 1536 +
1076                  * drvinfo_sz + RXDESC_SIZE to defrag packet.
1077                  */
1078                 if ((mf == 1) && (frag == 0))
1079                         /*1658+6=1664, 1664 is 128 alignment.*/
1080                         alloc_sz = max_t(u16, tmp_len, 1658);
1081                 else
1082                         alloc_sz = tmp_len;
1083                 /* 2 is for IP header 4 bytes alignment in QoS packet case.
1084                  * 4 is for skb->data 4 bytes alignment.
1085                  */
1086                 alloc_sz += 6;
1087                 pkt_copy = netdev_alloc_skb(padapter->pnetdev, alloc_sz);
1088                 if (pkt_copy) {
1089                         precvframe->u.hdr.pkt = pkt_copy;
1090                         skb_reserve(pkt_copy, 4 - ((addr_t)(pkt_copy->data)
1091                                     % 4));
1092                         skb_reserve(pkt_copy, shift_sz);
1093                         memcpy(pkt_copy->data, pbuf, tmp_len);
1094                         precvframe->u.hdr.rx_head = precvframe->u.hdr.rx_data =
1095                                  precvframe->u.hdr.rx_tail = pkt_copy->data;
1096                         precvframe->u.hdr.rx_end = pkt_copy->data + alloc_sz;
1097                 } else {
1098                         precvframe->u.hdr.pkt = skb_clone(pskb, GFP_ATOMIC);
1099                         if (!precvframe->u.hdr.pkt)
1100                                 return _FAIL;
1101                         precvframe->u.hdr.rx_head = pbuf;
1102                         precvframe->u.hdr.rx_data = pbuf;
1103                         precvframe->u.hdr.rx_tail = pbuf;
1104                         precvframe->u.hdr.rx_end = pbuf + alloc_sz;
1105                 }
1106                 recvframe_put(precvframe, tmp_len);
1107                 recvframe_pull(precvframe, drvinfo_sz + RXDESC_SIZE);
1108                 /* because the endian issue, driver avoid reference to the
1109                  * rxstat after calling update_recvframe_attrib_from_recvstat();
1110                  */
1111                 update_recvframe_attrib_from_recvstat(&precvframe->u.hdr.attrib,
1112                                                       prxstat);
1113                 r8712_recv_entry(precvframe);
1114                 transfer_len -= pkt_offset;
1115                 pbuf += pkt_offset;
1116                 pkt_cnt--;
1117                 precvframe = NULL;
1118                 pkt_copy = NULL;
1119         } while ((transfer_len > 0) && pkt_cnt > 0);
1120 _exit_recvbuf2recvframe:
1121         return _SUCCESS;
1122 }
1123
1124 static void recv_tasklet(void *priv)
1125 {
1126         struct sk_buff *pskb;
1127         struct _adapter *padapter = (struct _adapter *)priv;
1128         struct recv_priv *precvpriv = &padapter->recvpriv;
1129
1130         while (NULL != (pskb = skb_dequeue(&precvpriv->rx_skb_queue))) {
1131                 recvbuf2recvframe(padapter, pskb);
1132                 skb_reset_tail_pointer(pskb);
1133                 pskb->len = 0;
1134                 if (!skb_cloned(pskb))
1135                         skb_queue_tail(&precvpriv->free_recv_skb_queue, pskb);
1136                 else
1137                         consume_skb(pskb);
1138         }
1139 }