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