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