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 "osdep_service.h"
  32 #include "drv_types.h"
  33 #include "recv_osdep.h"
  34 #include "mlme_osdep.h"
  35 #include "ip.h"
  36 #include "if_ether.h"
  37 #include "ethernet.h"
  38 #include "usb_ops.h"
  39 #include "wifi.h"
  40
  41 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
  42 static u8 bridge_tunnel_header[] = {0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8};
  43
  44 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
  45 static u8 rfc1042_header[] = {0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00};
  46
  47 static void recv_tasklet(void *priv);
  48
  49 int r8712_init_recv_priv(struct recv_priv *precvpriv, struct _adapter *padapter)
  50 {
  51         int i;
  52         struct recv_buf *precvbuf;
  53         int res = _SUCCESS;
  54         addr_t tmpaddr = 0;
  55         int alignment = 0;
  56         struct sk_buff *pskb = NULL;
  57
  58         sema_init(&precvpriv->recv_sema, 0);
  59         sema_init(&precvpriv->terminate_recvthread_sema, 0);
  60         /*init recv_buf*/
  61         _init_queue(&precvpriv->free_recv_buf_queue);
  62         precvpriv->pallocated_recv_buf = _malloc(NR_RECVBUFF *
  63                                          sizeof(struct recv_buf) + 4);
  64         if (precvpriv->pallocated_recv_buf == NULL)
  65                 return _FAIL;
  66         memset(precvpriv->pallocated_recv_buf, 0, NR_RECVBUFF *
  67                 sizeof(struct recv_buf) + 4);
  68         precvpriv->precv_buf = precvpriv->pallocated_recv_buf + 4 -
  69                               ((addr_t) (precvpriv->pallocated_recv_buf) & 3);
  70         precvbuf = (struct recv_buf *)precvpriv->precv_buf;
  71         for (i = 0; i < NR_RECVBUFF; i++) {
  72                 _init_listhead(&precvbuf->list);
  73                 spin_lock_init(&precvbuf->recvbuf_lock);
  74                 res = r8712_os_recvbuf_resource_alloc(padapter, precvbuf);
  75                 if (res == _FAIL)
  76                         break;
  77                 precvbuf->ref_cnt = 0;
  78                 precvbuf->adapter = padapter;
  79                 list_insert_tail(&precvbuf->list,
  80                                  &(precvpriv->free_recv_buf_queue.queue));
  81                 precvbuf++;
  82         }
  83         precvpriv->free_recv_buf_queue_cnt = NR_RECVBUFF;
  84         tasklet_init(&precvpriv->recv_tasklet,
  85              (void(*)(unsigned long))recv_tasklet,
  86              (unsigned long)padapter);
  87         skb_queue_head_init(&precvpriv->rx_skb_queue);
  88
  89         skb_queue_head_init(&precvpriv->free_recv_skb_queue);
  90         for (i = 0; i < NR_PREALLOC_RECV_SKB; i++) {
  91                 pskb = netdev_alloc_skb(padapter->pnetdev, MAX_RECVBUF_SZ +
  92                        RECVBUFF_ALIGN_SZ);
  93                 if (pskb) {
  94                         pskb->dev = padapter->pnetdev;
  95                         tmpaddr = (addr_t)pskb->data;
  96                         alignment = tmpaddr & (RECVBUFF_ALIGN_SZ-1);
  97                         skb_reserve(pskb, (RECVBUFF_ALIGN_SZ - alignment));
  98                         skb_queue_tail(&precvpriv->free_recv_skb_queue, pskb);
  99                 }
 100                 pskb = NULL;
 101         }
 102         return res;
 103 }
 104
 105 void r8712_free_recv_priv(struct recv_priv *precvpriv)
 106 {
 107         int i;
 108         struct recv_buf *precvbuf;
 109         struct _adapter *padapter = precvpriv->adapter;
 110
 111         precvbuf = (struct recv_buf *)precvpriv->precv_buf;
 112         for (i = 0; i < NR_RECVBUFF ; i++) {
 113                 r8712_os_recvbuf_resource_free(padapter, precvbuf);
 114                 precvbuf++;
 115         }
 116         kfree(precvpriv->pallocated_recv_buf);
 117         skb_queue_purge(&precvpriv->rx_skb_queue);
 118         if (skb_queue_len(&precvpriv->rx_skb_queue))
 119                 printk(KERN_WARNING "r8712u: rx_skb_queue not empty\n");
 120         skb_queue_purge(&precvpriv->free_recv_skb_queue);
 121         if (skb_queue_len(&precvpriv->free_recv_skb_queue))
 122                 printk(KERN_WARNING "r8712u: free_recv_skb_queue not empty "
 123                        "%d\n", skb_queue_len(&precvpriv->free_recv_skb_queue));
 124 }
 125
 126 int r8712_init_recvbuf(struct _adapter *padapter, struct recv_buf *precvbuf)
 127 {
 128         int res = _SUCCESS;
 129
 130         precvbuf->transfer_len = 0;
 131         precvbuf->len = 0;
 132         precvbuf->ref_cnt = 0;
 133         if (precvbuf->pbuf) {
 134                 precvbuf->pdata = precvbuf->pbuf;
 135                 precvbuf->phead = precvbuf->pbuf;
 136                 precvbuf->ptail = precvbuf->pbuf;
 137                 precvbuf->pend = precvbuf->pdata + MAX_RECVBUF_SZ;
 138         }
 139         return res;
 140 }
 141
 142 int r8712_free_recvframe(union recv_frame *precvframe,
 143                    struct  __queue *pfree_recv_queue)
 144 {
 145         unsigned long irqL;
 146         struct _adapter *padapter = precvframe->u.hdr.adapter;
 147         struct recv_priv *precvpriv = &padapter->recvpriv;
 148
 149         if (precvframe->u.hdr.pkt) {
 150                 dev_kfree_skb_any(precvframe->u.hdr.pkt);/*free skb by driver*/
 151                 precvframe->u.hdr.pkt = NULL;
 152         }
 153         spin_lock_irqsave(&pfree_recv_queue->lock, irqL);
 154         list_delete(&(precvframe->u.hdr.list));
 155         list_insert_tail(&(precvframe->u.hdr.list),
 156                          get_list_head(pfree_recv_queue));
 157         if (padapter != NULL) {
 158                 if (pfree_recv_queue == &precvpriv->free_recv_queue)
 159                                 precvpriv->free_recvframe_cnt++;
 160         }
 161         spin_unlock_irqrestore(&pfree_recv_queue->lock, irqL);
 162         return _SUCCESS;
 163 }
 164
 165 static void update_recvframe_attrib_from_recvstat(struct rx_pkt_attrib *pattrib,
 166                                            struct recv_stat *prxstat)
 167 {
 168         u32 *pphy_info;
 169         struct phy_stat *pphy_stat;
 170         u16 drvinfo_sz = 0;
 171
 172         drvinfo_sz = (le32_to_cpu(prxstat->rxdw0)&0x000f0000)>>16;
 173         drvinfo_sz = drvinfo_sz<<3;
 174         /*TODO:
 175          * Offset 0 */
 176         pattrib->bdecrypted = ((le32_to_cpu(prxstat->rxdw0) & BIT(27)) >> 27)
 177                                  ? 0 : 1;
 178         pattrib->crc_err = ((le32_to_cpu(prxstat->rxdw0) & BIT(14)) >> 14);
 179         /*Offset 4*/
 180         /*Offset 8*/
 181         /*Offset 12*/
 182         if (le32_to_cpu(prxstat->rxdw3) & BIT(13)) {
 183                 pattrib->tcpchk_valid = 1; /* valid */
 184                 if (le32_to_cpu(prxstat->rxdw3) & BIT(11))
 185                         pattrib->tcp_chkrpt = 1; /* correct */
 186                 else
 187                         pattrib->tcp_chkrpt = 0; /* incorrect */
 188                 if (le32_to_cpu(prxstat->rxdw3) & BIT(12))
 189                         pattrib->ip_chkrpt = 1; /* correct */
 190                 else
 191                         pattrib->ip_chkrpt = 0; /* incorrect */
 192         } else
 193                 pattrib->tcpchk_valid = 0; /* invalid */
 194         pattrib->mcs_rate = (u8)((le32_to_cpu(prxstat->rxdw3)) & 0x3f);
 195         pattrib->htc = (u8)((le32_to_cpu(prxstat->rxdw3) >> 14) & 0x1);
 196         /*Offset 16*/
 197         /*Offset 20*/
 198         /*phy_info*/
 199         if (drvinfo_sz) {
 200                 pphy_stat = (struct phy_stat *)(prxstat+1);
 201                 pphy_info = (u32 *)prxstat+1;
 202         }
 203 }
 204
 205 /*perform defrag*/
 206 static union recv_frame *recvframe_defrag(struct _adapter *adapter,
 207                                    struct  __queue *defrag_q)
 208 {
 209         struct list_head *plist, *phead;
 210         u8      *data, wlanhdr_offset;
 211         u8      curfragnum;
 212         struct recv_frame_hdr *pfhdr, *pnfhdr;
 213         union recv_frame *prframe, *pnextrframe;
 214         struct  __queue *pfree_recv_queue;
 215
 216         pfree_recv_queue = &adapter->recvpriv.free_recv_queue;
 217         phead = get_list_head(defrag_q);
 218         plist = get_next(phead);
 219         prframe = LIST_CONTAINOR(plist, union recv_frame, u);
 220         list_delete(&prframe->u.list);
 221         pfhdr = &prframe->u.hdr;
 222         curfragnum = 0;
 223         if (curfragnum != pfhdr->attrib.frag_num) {
 224                 /*the first fragment number must be 0
 225                  *free the whole queue*/
 226                 r8712_free_recvframe(prframe, pfree_recv_queue);
 227                 r8712_free_recvframe_queue(defrag_q, pfree_recv_queue);
 228                 return NULL;
 229         }
 230         curfragnum++;
 231         plist = get_list_head(defrag_q);
 232         plist = get_next(plist);
 233         data = get_recvframe_data(prframe);
 234         while (end_of_queue_search(phead, plist) == false) {
 235                 pnextrframe = LIST_CONTAINOR(plist, union recv_frame, u);
 236                 pnfhdr = &pnextrframe->u.hdr;
 237                 /*check the fragment sequence  (2nd ~n fragment frame) */
 238                 if (curfragnum != pnfhdr->attrib.frag_num) {
 239                         /* the fragment number must increase  (after decache)
 240                          * release the defrag_q & prframe */
 241                         r8712_free_recvframe(prframe, pfree_recv_queue);
 242                         r8712_free_recvframe_queue(defrag_q, pfree_recv_queue);
 243                         return NULL;
 244                 }
 245                 curfragnum++;
 246                 /* copy the 2nd~n fragment frame's payload to the first fragment
 247                  * get the 2nd~last fragment frame's payload */
 248                 wlanhdr_offset = pnfhdr->attrib.hdrlen + pnfhdr->attrib.iv_len;
 249                 recvframe_pull(pnextrframe, wlanhdr_offset);
 250                 /* append  to first fragment frame's tail (if privacy frame,
 251                  * pull the ICV) */
 252                 recvframe_pull_tail(prframe, pfhdr->attrib.icv_len);
 253                 memcpy(pfhdr->rx_tail, pnfhdr->rx_data, pnfhdr->len);
 254                 recvframe_put(prframe, pnfhdr->len);
 255                 pfhdr->attrib.icv_len = pnfhdr->attrib.icv_len;
 256                 plist = get_next(plist);
 257         }
 258         /* free the defrag_q queue and return the prframe */
 259         r8712_free_recvframe_queue(defrag_q, pfree_recv_queue);
 260         return prframe;
 261 }
 262
 263 /* check if need to defrag, if needed queue the frame to defrag_q */
 264 union recv_frame *r8712_recvframe_chk_defrag(struct _adapter *padapter,
 265                                              union recv_frame *precv_frame)
 266 {
 267         u8      ismfrag;
 268         u8      fragnum;
 269         u8   *psta_addr;
 270         struct recv_frame_hdr *pfhdr;
 271         struct sta_info *psta;
 272         struct  sta_priv *pstapriv ;
 273         struct list_head *phead;
 274         union recv_frame *prtnframe = NULL;
 275         struct  __queue *pfree_recv_queue, *pdefrag_q;
 276
 277         pstapriv = &padapter->stapriv;
 278         pfhdr = &precv_frame->u.hdr;
 279         pfree_recv_queue = &padapter->recvpriv.free_recv_queue;
 280         /* need to define struct of wlan header frame ctrl */
 281         ismfrag = pfhdr->attrib.mfrag;
 282         fragnum = pfhdr->attrib.frag_num;
 283         psta_addr = pfhdr->attrib.ta;
 284         psta = r8712_get_stainfo(pstapriv, psta_addr);
 285         if (psta == NULL)
 286                 pdefrag_q = NULL;
 287         else
 288                 pdefrag_q = &psta->sta_recvpriv.defrag_q;
 289
 290         if ((ismfrag == 0) && (fragnum == 0))
 291                 prtnframe = precv_frame;/*isn't a fragment frame*/
 292         if (ismfrag == 1) {
 293                 /* 0~(n-1) fragment frame
 294                  * enqueue to defraf_g */
 295                 if (pdefrag_q != NULL) {
 296                         if (fragnum == 0) {
 297                                 /*the first fragment*/
 298                                 if (_queue_empty(pdefrag_q) == false) {
 299                                         /*free current defrag_q */
 300                                         r8712_free_recvframe_queue(pdefrag_q,
 301                                                              pfree_recv_queue);
 302                                 }
 303                         }
 304                         /* Then enqueue the 0~(n-1) fragment to the defrag_q */
 305                         phead = get_list_head(pdefrag_q);
 306                         list_insert_tail(&pfhdr->list, phead);
 307                         prtnframe = NULL;
 308                 } else {
 309                         /* can't find this ta's defrag_queue, so free this
 310                          * recv_frame */
 311                         r8712_free_recvframe(precv_frame, pfree_recv_queue);
 312                         prtnframe = NULL;
 313                 }
 314
 315         }
 316         if ((ismfrag == 0) && (fragnum != 0)) {
 317                 /* the last fragment frame
 318                  * enqueue the last fragment */
 319                 if (pdefrag_q != NULL) {
 320                         phead = get_list_head(pdefrag_q);
 321                         list_insert_tail(&pfhdr->list, phead);
 322                         /*call recvframe_defrag to defrag*/
 323                         precv_frame = recvframe_defrag(padapter, pdefrag_q);
 324                         prtnframe = precv_frame;
 325                 } else {
 326                         /* can't find this ta's defrag_queue, so free this
 327                          *  recv_frame */
 328                         r8712_free_recvframe(precv_frame, pfree_recv_queue);
 329                         prtnframe = NULL;
 330                 }
 331         }
 332         if ((prtnframe != NULL) && (prtnframe->u.hdr.attrib.privacy)) {
 333                 /* after defrag we must check tkip mic code */
 334                 if (r8712_recvframe_chkmic(padapter, prtnframe) == _FAIL) {
 335                         r8712_free_recvframe(prtnframe, pfree_recv_queue);
 336                         prtnframe = NULL;
 337                 }
 338         }
 339         return prtnframe;
 340 }
 341
 342 static int amsdu_to_msdu(struct _adapter *padapter, union recv_frame *prframe)
 343 {
 344         int     a_len, padding_len;
 345         u16     eth_type, nSubframe_Length;
 346         u8      nr_subframes, i;
 347         unsigned char *data_ptr, *pdata;
 348         struct rx_pkt_attrib *pattrib;
 349         _pkt *sub_skb, *subframes[MAX_SUBFRAME_COUNT];
 350         struct recv_priv *precvpriv = &padapter->recvpriv;
 351         struct  __queue *pfree_recv_queue = &(precvpriv->free_recv_queue);
 352         int     ret = _SUCCESS;
 353
 354         nr_subframes = 0;
 355         pattrib = &prframe->u.hdr.attrib;
 356         recvframe_pull(prframe, prframe->u.hdr.attrib.hdrlen);
 357         if (prframe->u.hdr.attrib.iv_len > 0)
 358                 recvframe_pull(prframe, prframe->u.hdr.attrib.iv_len);
 359         a_len = prframe->u.hdr.len;
 360         pdata = prframe->u.hdr.rx_data;
 361         while (a_len > ETH_HLEN) {
 362                 /* Offset 12 denote 2 mac address */
 363                 nSubframe_Length = *((u16 *)(pdata + 12));
 364                 /*==m==>change the length order*/
 365                 nSubframe_Length = (nSubframe_Length >> 8) +
 366                                    (nSubframe_Length << 8);
 367                 if (a_len < (ETHERNET_HEADER_SIZE + nSubframe_Length)) {
 368                         printk(KERN_WARNING "r8712u: nRemain_Length is %d and"
 369                             " nSubframe_Length is: %d\n",
 370                             a_len, nSubframe_Length);
 371                         goto exit;
 372                 }
 373                 /* move the data point to data content */
 374                 pdata += ETH_HLEN;
 375                 a_len -= ETH_HLEN;
 376                 /* Allocate new skb for releasing to upper layer */
 377                 sub_skb = dev_alloc_skb(nSubframe_Length + 12);
 378                 skb_reserve(sub_skb, 12);
 379                 data_ptr = (u8 *)skb_put(sub_skb, nSubframe_Length);
 380                 memcpy(data_ptr, pdata, nSubframe_Length);
 381                 subframes[nr_subframes++] = sub_skb;
 382                 if (nr_subframes >= MAX_SUBFRAME_COUNT) {
 383                         printk(KERN_WARNING "r8712u: ParseSubframe(): Too"
 384                             " many Subframes! Packets dropped!\n");
 385                         break;
 386                 }
 387                 pdata += nSubframe_Length;
 388                 a_len -= nSubframe_Length;
 389                 if (a_len != 0) {
 390                         padding_len = 4 - ((nSubframe_Length + ETH_HLEN) & 3);
 391                         if (padding_len == 4)
 392                                 padding_len = 0;
 393                         if (a_len < padding_len)
 394                                 goto exit;
 395                         pdata += padding_len;
 396                         a_len -= padding_len;
 397                 }
 398         }
 399         for (i = 0; i < nr_subframes; i++) {
 400                 sub_skb = subframes[i];
 401                 /* convert hdr + possible LLC headers into Ethernet header */
 402                 eth_type = (sub_skb->data[6] << 8) | sub_skb->data[7];
 403                 if (sub_skb->len >= 8 &&
 404                    ((!memcmp(sub_skb->data, rfc1042_header, SNAP_SIZE) &&
 405                    eth_type != ETH_P_AARP && eth_type != ETH_P_IPX) ||
 406                    !memcmp(sub_skb->data, bridge_tunnel_header, SNAP_SIZE))) {
 407                         /* remove RFC1042 or Bridge-Tunnel encapsulation and
 408                          * replace EtherType */
 409                         skb_pull(sub_skb, SNAP_SIZE);
 410                         memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->src,
 411                                 ETH_ALEN);
 412                         memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->dst,
 413                                 ETH_ALEN);
 414                 } else {
 415                         u16 len;
 416                         /* Leave Ethernet header part of hdr and full payload */
 417                         len = htons(sub_skb->len);
 418                         memcpy(skb_push(sub_skb, 2), &len, 2);
 419                         memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->src,
 420                                 ETH_ALEN);
 421                         memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->dst,
 422                                 ETH_ALEN);
 423                 }
 424                 /* Indicate the packets to upper layer */
 425                 if (sub_skb) {
 426                         sub_skb->protocol =
 427                                  eth_type_trans(sub_skb, padapter->pnetdev);
 428                         sub_skb->dev = padapter->pnetdev;
 429                         if ((pattrib->tcpchk_valid == 1) &&
 430                             (pattrib->tcp_chkrpt == 1)) {
 431                                 sub_skb->ip_summed = CHECKSUM_UNNECESSARY;
 432                         } else
 433                                 sub_skb->ip_summed = CHECKSUM_NONE;
 434                         netif_rx(sub_skb);
 435                 }
 436         }
 437 exit:
 438         prframe->u.hdr.len = 0;
 439         r8712_free_recvframe(prframe, pfree_recv_queue);
 440         return ret;
 441 }
 442
 443 void r8712_rxcmd_event_hdl(struct _adapter *padapter, void *prxcmdbuf)
 444 {
 445         uint voffset;
 446         u8 *poffset;
 447         u16 pkt_len, cmd_len, drvinfo_sz;
 448         u8 eid, cmd_seq;
 449         struct recv_stat *prxstat;
 450
 451         poffset = (u8 *)prxcmdbuf;
 452         voffset = *(uint *)poffset;
 453         pkt_len = le32_to_cpu(voffset) & 0x00003fff;
 454         prxstat = (struct recv_stat *)prxcmdbuf;
 455         drvinfo_sz = ((le32_to_cpu(prxstat->rxdw0) & 0x000f0000) >> 16);
 456         drvinfo_sz = drvinfo_sz << 3;
 457         poffset += RXDESC_SIZE + drvinfo_sz;
 458         do {
 459                 voffset  = *(uint *)poffset;
 460                 cmd_len = (u16)(le32_to_cpu(voffset) & 0xffff);
 461                 cmd_seq = (u8)((le32_to_cpu(voffset) >> 24) & 0x7f);
 462                 eid = (u8)((le32_to_cpu(voffset) >> 16) & 0xff);
 463                 r8712_event_handle(padapter, (uint *)poffset);
 464                 poffset += (cmd_len + 8);/*8 bytes aligment*/
 465         } while (le32_to_cpu(voffset) & BIT(31));
 466
 467 }
 468
 469 static int check_indicate_seq(struct recv_reorder_ctrl *preorder_ctrl,
 470                               u16 seq_num)
 471 {
 472         u8 wsize = preorder_ctrl->wsize_b;
 473         u16 wend = (preorder_ctrl->indicate_seq + wsize - 1) % 4096;
 474
 475         /* Rx Reorder initialize condition.*/
 476         if (preorder_ctrl->indicate_seq == 0xffff)
 477                 preorder_ctrl->indicate_seq = seq_num;
 478         /* Drop out the packet which SeqNum is smaller than WinStart */
 479         if (SN_LESS(seq_num, preorder_ctrl->indicate_seq))
 480                 return false;
 481         /*
 482          * Sliding window manipulation. Conditions includes:
 483          * 1. Incoming SeqNum is equal to WinStart =>Window shift 1
 484          * 2. Incoming SeqNum is larger than the WinEnd => Window shift N
 485          */
 486         if (SN_EQUAL(seq_num, preorder_ctrl->indicate_seq))
 487                 preorder_ctrl->indicate_seq = (preorder_ctrl->indicate_seq +
 488                                               1) % 4096;
 489         else if (SN_LESS(wend, seq_num)) {
 490                 if (seq_num >= (wsize - 1))
 491                         preorder_ctrl->indicate_seq = seq_num + 1 - wsize;
 492                 else
 493                         preorder_ctrl->indicate_seq = 4095 - (wsize -
 494                                                       (seq_num + 1)) + 1;
 495         }
 496         return true;
 497 }
 498
 499 static int enqueue_reorder_recvframe(struct recv_reorder_ctrl *preorder_ctrl,
 500                               union recv_frame *prframe)
 501 {
 502         struct list_head *phead, *plist;
 503         union recv_frame *pnextrframe;
 504         struct rx_pkt_attrib *pnextattrib;
 505         struct  __queue *ppending_recvframe_queue =
 506                                         &preorder_ctrl->pending_recvframe_queue;
 507         struct rx_pkt_attrib *pattrib = &prframe->u.hdr.attrib;
 508
 509         phead = get_list_head(ppending_recvframe_queue);
 510         plist = get_next(phead);
 511         while (end_of_queue_search(phead, plist) == false) {
 512                 pnextrframe = LIST_CONTAINOR(plist, union recv_frame, u);
 513                 pnextattrib = &pnextrframe->u.hdr.attrib;
 514                 if (SN_LESS(pnextattrib->seq_num, pattrib->seq_num))
 515                         plist = get_next(plist);
 516                 else if (SN_EQUAL(pnextattrib->seq_num, pattrib->seq_num))
 517                         return false;
 518                 else
 519                         break;
 520         }
 521         list_delete(&(prframe->u.hdr.list));
 522         list_insert_tail(&(prframe->u.hdr.list), plist);
 523         return true;
 524 }
 525
 526 int r8712_recv_indicatepkts_in_order(struct _adapter *padapter,
 527                                struct recv_reorder_ctrl *preorder_ctrl,
 528                                int bforced)
 529 {
 530         struct list_head *phead, *plist;
 531         union recv_frame *prframe;
 532         struct rx_pkt_attrib *pattrib;
 533         int bPktInBuf = false;
 534         struct recv_priv *precvpriv = &padapter->recvpriv;
 535         struct  __queue *ppending_recvframe_queue =
 536                          &preorder_ctrl->pending_recvframe_queue;
 537
 538         phead = get_list_head(ppending_recvframe_queue);
 539         plist = get_next(phead);
 540         /* Handling some condition for forced indicate case.*/
 541         if (bforced == true) {
 542                 if (is_list_empty(phead))
 543                         return true;
 544                 else {
 545                         prframe = LIST_CONTAINOR(plist, union recv_frame, u);
 546                         pattrib = &prframe->u.hdr.attrib;
 547                         preorder_ctrl->indicate_seq = pattrib->seq_num;
 548                 }
 549         }
 550         /* Prepare indication list and indication.
 551          * Check if there is any packet need indicate. */
 552         while (!is_list_empty(phead)) {
 553                 prframe = LIST_CONTAINOR(plist, union recv_frame, u);
 554                 pattrib = &prframe->u.hdr.attrib;
 555                 if (!SN_LESS(preorder_ctrl->indicate_seq, pattrib->seq_num)) {
 556                         plist = get_next(plist);
 557                         list_delete(&(prframe->u.hdr.list));
 558                         if (SN_EQUAL(preorder_ctrl->indicate_seq,
 559                             pattrib->seq_num))
 560                                 preorder_ctrl->indicate_seq =
 561                                   (preorder_ctrl->indicate_seq + 1) % 4096;
 562                         /*indicate this recv_frame*/
 563                         if (!pattrib->amsdu) {
 564                                 if ((padapter->bDriverStopped == false) &&
 565                                     (padapter->bSurpriseRemoved == false)) {
 566                                         /* indicate this recv_frame */
 567                                         r8712_recv_indicatepkt(padapter,
 568                                                                prframe);
 569                                 }
 570                         } else if (pattrib->amsdu == 1) {
 571                                 if (amsdu_to_msdu(padapter, prframe) !=
 572                                     _SUCCESS)
 573                                         r8712_free_recvframe(prframe,
 574                                                    &precvpriv->free_recv_queue);
 575                         }
 576                         /* Update local variables. */
 577                         bPktInBuf = false;
 578                 } else {
 579                         bPktInBuf = true;
 580                         break;
 581                 }
 582         }
 583         return bPktInBuf;
 584 }
 585
 586 static int recv_indicatepkt_reorder(struct _adapter *padapter,
 587                              union recv_frame *prframe)
 588 {
 589         unsigned long irql;
 590         struct rx_pkt_attrib *pattrib = &prframe->u.hdr.attrib;
 591         struct recv_reorder_ctrl *preorder_ctrl = prframe->u.hdr.preorder_ctrl;
 592         struct  __queue *ppending_recvframe_queue =
 593                          &preorder_ctrl->pending_recvframe_queue;
 594
 595         if (!pattrib->amsdu) {
 596                 /* s1. */
 597                 r8712_wlanhdr_to_ethhdr(prframe);
 598                 if (pattrib->qos != 1) {
 599                         if ((padapter->bDriverStopped == false) &&
 600                            (padapter->bSurpriseRemoved == false)) {
 601                                 r8712_recv_indicatepkt(padapter, prframe);
 602                                 return _SUCCESS;
 603                         } else
 604                                 return _FAIL;
 605                 }
 606         }
 607         spin_lock_irqsave(&ppending_recvframe_queue->lock, irql);
 608         /*s2. check if winstart_b(indicate_seq) needs to been updated*/
 609         if (!check_indicate_seq(preorder_ctrl, pattrib->seq_num))
 610                 goto _err_exit;
 611         /*s3. Insert all packet into Reorder Queue to maintain its ordering.*/
 612         if (!enqueue_reorder_recvframe(preorder_ctrl, prframe))
 613                 goto _err_exit;
 614         /*s4.
 615          * Indication process.
 616          * After Packet dropping and Sliding Window shifting as above, we can
 617          * now just indicate the packets with the SeqNum smaller than latest
 618          * WinStart and buffer other packets.
 619          *
 620          * For Rx Reorder condition:
 621          * 1. All packets with SeqNum smaller than WinStart => Indicate
 622          * 2. All packets with SeqNum larger than or equal to
 623          * WinStart => Buffer it.
 624          */
 625         if (r8712_recv_indicatepkts_in_order(padapter, preorder_ctrl, false) ==
 626             true) {
 627                 _set_timer(&preorder_ctrl->reordering_ctrl_timer,
 628                            REORDER_WAIT_TIME);
 629                 spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
 630         } else {
 631                 spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
 632                 _cancel_timer_ex(&preorder_ctrl->reordering_ctrl_timer);
 633         }
 634         return _SUCCESS;
 635 _err_exit:
 636         spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
 637         return _FAIL;
 638 }
 639
 640 void r8712_reordering_ctrl_timeout_handler(void *pcontext)
 641 {
 642         unsigned long irql;
 643         struct recv_reorder_ctrl *preorder_ctrl =
 644                                  (struct recv_reorder_ctrl *)pcontext;
 645         struct _adapter *padapter = preorder_ctrl->padapter;
 646         struct  __queue *ppending_recvframe_queue =
 647                                  &preorder_ctrl->pending_recvframe_queue;
 648
 649         if (padapter->bDriverStopped || padapter->bSurpriseRemoved)
 650                 return;
 651         spin_lock_irqsave(&ppending_recvframe_queue->lock, irql);
 652         r8712_recv_indicatepkts_in_order(padapter, preorder_ctrl, true);
 653         spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
 654 }
 655
 656 static int r8712_process_recv_indicatepkts(struct _adapter *padapter,
 657                               union recv_frame *prframe)
 658 {
 659         int retval = _SUCCESS;
 660         struct mlme_priv *pmlmepriv = &padapter->mlmepriv;
 661         struct ht_priv  *phtpriv = &pmlmepriv->htpriv;
 662
 663         if (phtpriv->ht_option == 1) { /*B/G/N Mode*/
 664                 if (recv_indicatepkt_reorder(padapter, prframe) != _SUCCESS) {
 665                         /* including perform A-MPDU Rx Ordering Buffer Control*/
 666                         if ((padapter->bDriverStopped == false) &&
 667                             (padapter->bSurpriseRemoved == false))
 668                                 return _FAIL;
 669                 }
 670         } else { /*B/G mode*/
 671                 retval = r8712_wlanhdr_to_ethhdr(prframe);
 672                 if (retval != _SUCCESS)
 673                         return retval;
 674                 if ((padapter->bDriverStopped == false) &&
 675                     (padapter->bSurpriseRemoved == false)) {
 676                         /* indicate this recv_frame */
 677                         r8712_recv_indicatepkt(padapter, prframe);
 678                 } else
 679                         return _FAIL;
 680         }
 681         return retval;
 682 }
 683
 684 static u8 query_rx_pwr_percentage(s8 antpower)
 685 {
 686         if ((antpower <= -100) || (antpower >= 20))
 687                 return  0;
 688         else if (antpower >= 0)
 689                 return  100;
 690         else
 691                 return 100 + antpower;
 692 }
 693
 694 static u8 evm_db2percentage(s8 value)
 695 {
 696         /*
 697          * -33dB~0dB to 0%~99%
 698          */
 699         s8 ret_val;
 700
 701         ret_val = value;
 702         if (ret_val >= 0)
 703                 ret_val = 0;
 704         if (ret_val <= -33)
 705                 ret_val = -33;
 706         ret_val = -ret_val;
 707         ret_val *= 3;
 708         if (ret_val == 99)
 709                 ret_val = 100;
 710         return ret_val;
 711 }
 712
 713 s32 r8712_signal_scale_mapping(s32 cur_sig)
 714 {
 715         s32 ret_sig;
 716
 717         if (cur_sig >= 51 && cur_sig <= 100)
 718                 ret_sig = 100;
 719         else if (cur_sig >= 41 && cur_sig <= 50)
 720                 ret_sig = 80 + ((cur_sig - 40) * 2);
 721         else if (cur_sig >= 31 && cur_sig <= 40)
 722                 ret_sig = 66 + (cur_sig - 30);
 723         else if (cur_sig >= 21 && cur_sig <= 30)
 724                 ret_sig = 54 + (cur_sig - 20);
 725         else if (cur_sig >= 10 && cur_sig <= 20)
 726                 ret_sig = 42 + (((cur_sig - 10) * 2) / 3);
 727         else if (cur_sig >= 5 && cur_sig <= 9)
 728                 ret_sig = 22 + (((cur_sig - 5) * 3) / 2);
 729         else if (cur_sig >= 1 && cur_sig <= 4)
 730                 ret_sig = 6 + (((cur_sig - 1) * 3) / 2);
 731         else
 732                 ret_sig = cur_sig;
 733         return ret_sig;
 734 }
 735
 736 static s32  translate2dbm(struct _adapter *padapter, u8 signal_strength_idx)
 737 {
 738         s32 signal_power; /* in dBm.*/
 739         /* Translate to dBm (x=0.5y-95).*/
 740         signal_power = (s32)((signal_strength_idx + 1) >> 1);
 741         signal_power -= 95;
 742         return signal_power;
 743 }
 744
 745 static void query_rx_phy_status(struct _adapter *padapter,
 746                                 union recv_frame *prframe)
 747 {
 748         u8 i, max_spatial_stream, evm;
 749         struct recv_stat *prxstat = (struct recv_stat *)prframe->u.hdr.rx_head;
 750         struct phy_stat *pphy_stat = (struct phy_stat *)(prxstat + 1);
 751         u8 *pphy_head = (u8 *)(prxstat + 1);
 752         s8 rx_pwr[4], rx_pwr_all;
 753         u8 pwdb_all;
 754         u32 rssi, total_rssi = 0;
 755         u8 bcck_rate = 0, rf_rx_num = 0, cck_highpwr = 0;
 756         struct phy_cck_rx_status *pcck_buf;
 757         u8 sq;
 758
 759         /* Record it for next packet processing*/
 760         bcck_rate = (prframe->u.hdr.attrib.mcs_rate <= 3 ? 1 : 0);
 761         if (bcck_rate) {
 762                 u8 report;
 763
 764                 /* CCK Driver info Structure is not the same as OFDM packet.*/
 765                 pcck_buf = (struct phy_cck_rx_status *)pphy_stat;
 766                 /* (1)Hardware does not provide RSSI for CCK
 767                  * (2)PWDB, Average PWDB cacluated by hardware
 768                  * (for rate adaptive)
 769                  */
 770                 if (!cck_highpwr) {
 771                         report = pcck_buf->cck_agc_rpt & 0xc0;
 772                         report = report >> 6;
 773                         switch (report) {
 774                         /* Modify the RF RNA gain value to -40, -20,
 775                          * -2, 14 by Jenyu's suggestion
 776                          * Note: different RF with the different
 777                          * RNA gain. */
 778                         case 0x3:
 779                                 rx_pwr_all = -40 - (pcck_buf->cck_agc_rpt &
 780                                              0x3e);
 781                                 break;
 782                         case 0x2:
 783                                 rx_pwr_all = -20 - (pcck_buf->cck_agc_rpt &
 784                                              0x3e);
 785                                 break;
 786                         case 0x1:
 787                                 rx_pwr_all = -2 - (pcck_buf->cck_agc_rpt &
 788                                              0x3e);
 789                                 break;
 790                         case 0x0:
 791                                 rx_pwr_all = 14 - (pcck_buf->cck_agc_rpt &
 792                                              0x3e);
 793                                 break;
 794                         }
 795                 } else {
 796                         report = ((u8)(le32_to_cpu(pphy_stat->phydw1) >> 8)) &
 797                                  0x60;
 798                         report = report >> 5;
 799                         switch (report) {
 800                         case 0x3:
 801                                 rx_pwr_all = -40 - ((pcck_buf->cck_agc_rpt &
 802                                              0x1f) << 1);
 803                                 break;
 804                         case 0x2:
 805                                 rx_pwr_all = -20 - ((pcck_buf->cck_agc_rpt &
 806                                              0x1f) << 1);
 807                                 break;
 808                         case 0x1:
 809                                 rx_pwr_all = -2 - ((pcck_buf->cck_agc_rpt &
 810                                              0x1f) << 1);
 811                                 break;
 812                         case 0x0:
 813                                 rx_pwr_all = 14 - ((pcck_buf->cck_agc_rpt &
 814                                              0x1f) << 1);
 815                                 break;
 816                         }
 817                 }
 818                 pwdb_all = query_rx_pwr_percentage(rx_pwr_all);
 819                 /* CCK gain is smaller than OFDM/MCS gain,*/
 820                 /* so we add gain diff by experiences, the val is 6 */
 821                 pwdb_all += 6;
 822                 if (pwdb_all > 100)
 823                         pwdb_all = 100;
 824                 /* modify the offset to make the same gain index with OFDM.*/
 825                 if (pwdb_all > 34 && pwdb_all <= 42)
 826                         pwdb_all -= 2;
 827                 else if (pwdb_all > 26 && pwdb_all <= 34)
 828                         pwdb_all -= 6;
 829                 else if (pwdb_all > 14 && pwdb_all <= 26)
 830                         pwdb_all -= 8;
 831                 else if (pwdb_all > 4 && pwdb_all <= 14)
 832                         pwdb_all -= 4;
 833                 /*
 834                  * (3) Get Signal Quality (EVM)
 835                  */
 836                 if (pwdb_all > 40)
 837                         sq = 100;
 838                 else {
 839                         sq = pcck_buf->sq_rpt;
 840                         if (pcck_buf->sq_rpt > 64)
 841                                 sq = 0;
 842                         else if (pcck_buf->sq_rpt < 20)
 843                                 sq = 100;
 844                         else
 845                                 sq = ((64-sq) * 100) / 44;
 846                 }
 847                 prframe->u.hdr.attrib.signal_qual = sq;
 848                 prframe->u.hdr.attrib.rx_mimo_signal_qual[0] = sq;
 849                 prframe->u.hdr.attrib.rx_mimo_signal_qual[1] = -1;
 850         } else {
 851                 /* (1)Get RSSI for HT rate */
 852                 for (i = 0; i < ((padapter->registrypriv.rf_config) &
 853                             0x0f) ; i++) {
 854                         rf_rx_num++;
 855                         rx_pwr[i] = ((pphy_head[PHY_STAT_GAIN_TRSW_SHT + i]
 856                                     & 0x3F) * 2) - 110;
 857                         /* Translate DBM to percentage. */
 858                         rssi = query_rx_pwr_percentage(rx_pwr[i]);
 859                         total_rssi += rssi;
 860                 }
 861                 /* (2)PWDB, Average PWDB cacluated by hardware (for
 862                  * rate adaptive) */
 863                 rx_pwr_all = (((pphy_head[PHY_STAT_PWDB_ALL_SHT]) >> 1) & 0x7f)
 864                              - 106;
 865                 pwdb_all = query_rx_pwr_percentage(rx_pwr_all);
 866
 867                 {
 868                         /* (3)EVM of HT rate */
 869                         if (prframe->u.hdr.attrib.htc &&
 870                             prframe->u.hdr.attrib.mcs_rate >= 20 &&
 871                             prframe->u.hdr.attrib.mcs_rate <= 27) {
 872                                 /* both spatial stream make sense */
 873                                 max_spatial_stream = 2;
 874                         } else {
 875                                 /* only spatial stream 1 makes sense */
 876                                 max_spatial_stream = 1;
 877                         }
 878                         for (i = 0; i < max_spatial_stream; i++) {
 879                                 evm = evm_db2percentage((pphy_head
 880                                       [PHY_STAT_RXEVM_SHT + i]));/*dbm*/
 881                                 prframe->u.hdr.attrib.signal_qual =
 882                                          (u8)(evm & 0xff);
 883                                 prframe->u.hdr.attrib.rx_mimo_signal_qual[i] =
 884                                          (u8)(evm & 0xff);
 885                         }
 886                 }
 887         }
 888         /* UI BSS List signal strength(in percentage), make it good looking,
 889          * from 0~100. It is assigned to the BSS List in
 890          * GetValueFromBeaconOrProbeRsp(). */
 891         if (bcck_rate)
 892                 prframe->u.hdr.attrib.signal_strength =
 893                          (u8)r8712_signal_scale_mapping(pwdb_all);
 894         else {
 895                 if (rf_rx_num != 0)
 896                         prframe->u.hdr.attrib.signal_strength =
 897                                  (u8)(r8712_signal_scale_mapping(total_rssi /=
 898                                  rf_rx_num));
 899         }
 900 }
 901
 902 static void process_link_qual(struct _adapter *padapter,
 903                               union recv_frame *prframe)
 904 {
 905         u32     last_evm = 0, tmpVal;
 906         struct rx_pkt_attrib *pattrib;
 907
 908         if (prframe == NULL || padapter == NULL)
 909                 return;
 910         pattrib = &prframe->u.hdr.attrib;
 911         if (pattrib->signal_qual != 0) {
 912                 /*
 913                  * 1. Record the general EVM to the sliding window.
 914                  */
 915                 if (padapter->recvpriv.signal_qual_data.total_num++ >=
 916                                   PHY_LINKQUALITY_SLID_WIN_MAX) {
 917                         padapter->recvpriv.signal_qual_data.total_num =
 918                                   PHY_LINKQUALITY_SLID_WIN_MAX;
 919                         last_evm = padapter->recvpriv.signal_qual_data.elements
 920                                   [padapter->recvpriv.signal_qual_data.index];
 921                         padapter->recvpriv.signal_qual_data.total_val -=
 922                                   last_evm;
 923                 }
 924                 padapter->recvpriv.signal_qual_data.total_val +=
 925                           pattrib->signal_qual;
 926                 padapter->recvpriv.signal_qual_data.elements[padapter->
 927                           recvpriv.signal_qual_data.index++] =
 928                           pattrib->signal_qual;
 929                 if (padapter->recvpriv.signal_qual_data.index >=
 930                     PHY_LINKQUALITY_SLID_WIN_MAX)
 931                         padapter->recvpriv.signal_qual_data.index = 0;
 932
 933                 /* <1> Showed on UI for user, in percentage. */
 934                 tmpVal = padapter->recvpriv.signal_qual_data.total_val /
 935                          padapter->recvpriv.signal_qual_data.total_num;
 936                 padapter->recvpriv.signal = (u8)tmpVal;
 937         }
 938 }
 939
 940 static void process_rssi(struct _adapter *padapter, union recv_frame *prframe)
 941 {
 942         u32 last_rssi, tmp_val;
 943         struct rx_pkt_attrib *pattrib = &prframe->u.hdr.attrib;
 944
 945         if (padapter->recvpriv.signal_strength_data.total_num++ >=
 946             PHY_RSSI_SLID_WIN_MAX) {
 947                 padapter->recvpriv.signal_strength_data.total_num =
 948                          PHY_RSSI_SLID_WIN_MAX;
 949                 last_rssi = padapter->recvpriv.signal_strength_data.elements
 950                             [padapter->recvpriv.signal_strength_data.index];
 951                 padapter->recvpriv.signal_strength_data.total_val -= last_rssi;
 952         }
 953         padapter->recvpriv.signal_strength_data.total_val +=
 954                         pattrib->signal_strength;
 955         padapter->recvpriv.signal_strength_data.elements[padapter->recvpriv.
 956                         signal_strength_data.index++] =
 957                         pattrib->signal_strength;
 958         if (padapter->recvpriv.signal_strength_data.index >=
 959             PHY_RSSI_SLID_WIN_MAX)
 960                 padapter->recvpriv.signal_strength_data.index = 0;
 961         tmp_val = padapter->recvpriv.signal_strength_data.total_val /
 962                   padapter->recvpriv.signal_strength_data.total_num;
 963         padapter->recvpriv.rssi = (s8)translate2dbm(padapter, (u8)tmp_val);
 964 }
 965
 966 static void process_phy_info(struct _adapter *padapter,
 967                              union recv_frame *prframe)
 968 {
 969         query_rx_phy_status(padapter, prframe);
 970         process_rssi(padapter, prframe);
 971         process_link_qual(padapter,  prframe);
 972 }
 973
 974 int recv_func(struct _adapter *padapter, void *pcontext)
 975 {
 976         struct rx_pkt_attrib *pattrib;
 977         union recv_frame *prframe, *orig_prframe;
 978         int retval = _SUCCESS;
 979         struct  __queue *pfree_recv_queue = &padapter->recvpriv.free_recv_queue;
 980         struct  mlme_priv       *pmlmepriv = &padapter->mlmepriv;
 981
 982         prframe = (union recv_frame *)pcontext;
 983         orig_prframe = prframe;
 984         pattrib = &prframe->u.hdr.attrib;
 985         if ((check_fwstate(pmlmepriv, WIFI_MP_STATE) == true)) {
 986                 if (pattrib->crc_err == 1)
 987                         padapter->mppriv.rx_crcerrpktcount++;
 988                 else
 989                         padapter->mppriv.rx_pktcount++;
 990                 if (check_fwstate(pmlmepriv, WIFI_MP_LPBK_STATE) == false) {
 991                         /* free this recv_frame */
 992                         r8712_free_recvframe(orig_prframe, pfree_recv_queue);
 993                         goto _exit_recv_func;
 994                 }
 995         }
 996         /* check the frame crtl field and decache */
 997         retval = r8712_validate_recv_frame(padapter, prframe);
 998         if (retval != _SUCCESS) {
 999                 /* free this recv_frame */
1000                 r8712_free_recvframe(orig_prframe, pfree_recv_queue);
1001                 goto _exit_recv_func;
1002         }
1003         process_phy_info(padapter, prframe);
1004         prframe = r8712_decryptor(padapter, prframe);
1005         if (prframe == NULL) {
1006                 retval = _FAIL;
1007                 goto _exit_recv_func;
1008         }
1009         prframe = r8712_recvframe_chk_defrag(padapter, prframe);
1010         if (prframe == NULL)
1011                 goto _exit_recv_func;
1012         prframe = r8712_portctrl(padapter, prframe);
1013         if (prframe == NULL) {
1014                 retval = _FAIL;
1015                 goto _exit_recv_func;
1016         }
1017         retval = r8712_process_recv_indicatepkts(padapter, prframe);
1018         if (retval != _SUCCESS) {
1019                 r8712_free_recvframe(orig_prframe, pfree_recv_queue);
1020                 goto _exit_recv_func;
1021         }
1022 _exit_recv_func:
1023         return retval;
1024 }
1025
1026 static int recvbuf2recvframe(struct _adapter *padapter, struct sk_buff *pskb)
1027 {
1028         u8 *pbuf, shift_sz = 0;
1029         u8      frag, mf;
1030         uint    pkt_len;
1031         u32 transfer_len;
1032         struct recv_stat *prxstat;
1033         u16     pkt_cnt, drvinfo_sz, pkt_offset, tmp_len, alloc_sz;
1034         struct  __queue *pfree_recv_queue;
1035         _pkt  *pkt_copy = NULL;
1036         union recv_frame *precvframe = NULL;
1037         struct recv_priv *precvpriv = &padapter->recvpriv;
1038
1039         pfree_recv_queue = &(precvpriv->free_recv_queue);
1040         pbuf = pskb->data;
1041         prxstat = (struct recv_stat *)pbuf;
1042         pkt_cnt = (le32_to_cpu(prxstat->rxdw2)>>16)&0xff;
1043         pkt_len =  le32_to_cpu(prxstat->rxdw0)&0x00003fff;
1044         transfer_len = pskb->len;
1045         /* Test throughput with Netgear 3700 (No security) with Chariot 3T3R
1046          * pairs. The packet count will be a big number so that the containing
1047          * packet will effect the Rx reordering. */
1048         if (transfer_len < pkt_len) {
1049                 /* In this case, it means the MAX_RECVBUF_SZ is too small to
1050                  * get the data from 8712u. */
1051                 return _FAIL;
1052         }
1053         do {
1054                 prxstat = (struct recv_stat *)pbuf;
1055                 pkt_len =  le32_to_cpu(prxstat->rxdw0)&0x00003fff;
1056                 /* more fragment bit */
1057                 mf = (le32_to_cpu(prxstat->rxdw1) >> 27) & 0x1;
1058                 /* ragmentation number */
1059                 frag = (le32_to_cpu(prxstat->rxdw2) >> 12) & 0xf;
1060                 /* uint 2^3 = 8 bytes */
1061                 drvinfo_sz = (le32_to_cpu(prxstat->rxdw0) & 0x000f0000) >> 16;
1062                 drvinfo_sz = drvinfo_sz<<3;
1063                 if (pkt_len <= 0)
1064                         goto  _exit_recvbuf2recvframe;
1065                 /* Qos data, wireless lan header length is 26 */
1066                 if ((le32_to_cpu(prxstat->rxdw0) >> 23) & 0x01)
1067                         shift_sz = 2;
1068                 precvframe = r8712_alloc_recvframe(pfree_recv_queue);
1069                 if (precvframe == NULL)
1070                         goto  _exit_recvbuf2recvframe;
1071                 _init_listhead(&precvframe->u.hdr.list);
1072                 precvframe->u.hdr.precvbuf = NULL; /*can't access the precvbuf*/
1073                 precvframe->u.hdr.len = 0;
1074                 tmp_len = pkt_len + drvinfo_sz + RXDESC_SIZE;
1075                 pkt_offset = (u16)_RND128(tmp_len);
1076                 /* for first fragment packet, driver need allocate 1536 +
1077                  * drvinfo_sz + RXDESC_SIZE to defrag packet. */
1078                 if ((mf == 1) && (frag == 0))
1079                         alloc_sz = 1658;/*1658+6=1664, 1664 is 128 alignment.*/
1080                 else
1081                         alloc_sz = tmp_len;
1082                 /* 2 is for IP header 4 bytes alignment in QoS packet case.
1083                  * 4 is for skb->data 4 bytes alignment. */
1084                 alloc_sz += 6;
1085                 pkt_copy = netdev_alloc_skb(padapter->pnetdev, alloc_sz);
1086                 if (pkt_copy) {
1087                         pkt_copy->dev = padapter->pnetdev;
1088                         precvframe->u.hdr.pkt = pkt_copy;
1089                         skb_reserve(pkt_copy, 4 - ((addr_t)(pkt_copy->data)
1090                                     % 4));
1091                         skb_reserve(pkt_copy, shift_sz);
1092                         memcpy(pkt_copy->data, pbuf, tmp_len);
1093                         precvframe->u.hdr.rx_head = precvframe->u.hdr.rx_data =
1094                                  precvframe->u.hdr.rx_tail = pkt_copy->data;
1095                         precvframe->u.hdr.rx_end = pkt_copy->data + alloc_sz;
1096                 } else {
1097                         precvframe->u.hdr.pkt = skb_clone(pskb, GFP_ATOMIC);
1098                         precvframe->u.hdr.rx_head = pbuf;
1099                         precvframe->u.hdr.rx_data = pbuf;
1100                         precvframe->u.hdr.rx_tail = pbuf;
1101                         precvframe->u.hdr.rx_end = pbuf + alloc_sz;
1102                 }
1103                 recvframe_put(precvframe, tmp_len);
1104                 recvframe_pull(precvframe, drvinfo_sz + RXDESC_SIZE);
1105                 /* because the endian issue, driver avoid reference to the
1106                  * rxstat after calling update_recvframe_attrib_from_recvstat();
1107                  */
1108                 update_recvframe_attrib_from_recvstat(&precvframe->u.hdr.attrib,
1109                                                       prxstat);
1110                 r8712_recv_entry(precvframe);
1111                 transfer_len -= pkt_offset;
1112                 pbuf += pkt_offset;
1113                 pkt_cnt--;
1114                 precvframe = NULL;
1115                 pkt_copy = NULL;
1116         } while ((transfer_len > 0) && pkt_cnt > 0);
1117 _exit_recvbuf2recvframe:
1118         return _SUCCESS;
1119 }
1120
1121 static void recv_tasklet(void *priv)
1122 {
1123         struct sk_buff *pskb;
1124         struct _adapter *padapter = (struct _adapter *)priv;
1125         struct recv_priv *precvpriv = &padapter->recvpriv;
1126
1127         while (NULL != (pskb = skb_dequeue(&precvpriv->rx_skb_queue))) {
1128                 recvbuf2recvframe(padapter, pskb);
1129                 skb_reset_tail_pointer(pskb);
1130                 pskb->len = 0;
1131                 skb_queue_tail(&precvpriv->free_recv_skb_queue, pskb);
1132         }
1133 }