kernel/drivers/staging/rtl8712/rtl8712_recv.c

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