linux/drivers/staging/rtl8712/rtl8712_recv.c
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   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) */
  43static u8 bridge_tunnel_header[] = {0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8};
  44
  45/* Ethernet-II snap header (RFC1042 for most EtherTypes) */
  46static u8 rfc1042_header[] = {0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00};
  47
  48static void recv_tasklet(void *priv);
  49
  50int r8712_init_recv_priv(struct recv_priv *precvpriv, struct _adapter *padapter)
  51{
  52        int i;
  53        struct recv_buf *precvbuf;
  54        int res = _SUCCESS;
  55        addr_t tmpaddr = 0;
  56        int alignment = 0;
  57        struct sk_buff *pskb = NULL;
  58
  59        /*init recv_buf*/
  60        _init_queue(&precvpriv->free_recv_buf_queue);
  61        precvpriv->pallocated_recv_buf =
  62                kzalloc(NR_RECVBUFF * sizeof(struct recv_buf) + 4, GFP_ATOMIC);
  63        if (!precvpriv->pallocated_recv_buf)
  64                return _FAIL;
  65        precvpriv->precv_buf = precvpriv->pallocated_recv_buf + 4 -
  66                              ((addr_t) (precvpriv->pallocated_recv_buf) & 3);
  67        precvbuf = (struct recv_buf *)precvpriv->precv_buf;
  68        for (i = 0; i < NR_RECVBUFF; i++) {
  69                INIT_LIST_HEAD(&precvbuf->list);
  70                spin_lock_init(&precvbuf->recvbuf_lock);
  71                res = r8712_os_recvbuf_resource_alloc(padapter, precvbuf);
  72                if (res == _FAIL)
  73                        break;
  74                precvbuf->ref_cnt = 0;
  75                precvbuf->adapter = padapter;
  76                list_add_tail(&precvbuf->list,
  77                                 &(precvpriv->free_recv_buf_queue.queue));
  78                precvbuf++;
  79        }
  80        precvpriv->free_recv_buf_queue_cnt = NR_RECVBUFF;
  81        tasklet_init(&precvpriv->recv_tasklet,
  82             (void(*)(unsigned long))recv_tasklet,
  83             (unsigned long)padapter);
  84        skb_queue_head_init(&precvpriv->rx_skb_queue);
  85
  86        skb_queue_head_init(&precvpriv->free_recv_skb_queue);
  87        for (i = 0; i < NR_PREALLOC_RECV_SKB; i++) {
  88                pskb = netdev_alloc_skb(padapter->pnetdev, MAX_RECVBUF_SZ +
  89                       RECVBUFF_ALIGN_SZ);
  90                if (pskb) {
  91                        tmpaddr = (addr_t)pskb->data;
  92                        alignment = tmpaddr & (RECVBUFF_ALIGN_SZ - 1);
  93                        skb_reserve(pskb, (RECVBUFF_ALIGN_SZ - alignment));
  94                        skb_queue_tail(&precvpriv->free_recv_skb_queue, pskb);
  95                }
  96                pskb = NULL;
  97        }
  98        return res;
  99}
 100
 101void 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
 122int 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
 136int 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
 158static void update_recvframe_attrib_from_recvstat(struct rx_pkt_attrib *pattrib,
 159                                           struct recv_stat *prxstat)
 160{
 161        u16 drvinfo_sz;
 162
 163        drvinfo_sz = (le32_to_cpu(prxstat->rxdw0) & 0x000f0000) >> 16;
 164        drvinfo_sz <<= 3;
 165        /*TODO:
 166         * Offset 0
 167         */
 168        pattrib->bdecrypted = ((le32_to_cpu(prxstat->rxdw0) & BIT(27)) >> 27)
 169                                 ? 0 : 1;
 170        pattrib->crc_err = (le32_to_cpu(prxstat->rxdw0) & BIT(14)) >> 14;
 171        /*Offset 4*/
 172        /*Offset 8*/
 173        /*Offset 12*/
 174        if (le32_to_cpu(prxstat->rxdw3) & BIT(13)) {
 175                pattrib->tcpchk_valid = 1; /* valid */
 176                if (le32_to_cpu(prxstat->rxdw3) & BIT(11))
 177                        pattrib->tcp_chkrpt = 1; /* correct */
 178                else
 179                        pattrib->tcp_chkrpt = 0; /* incorrect */
 180                if (le32_to_cpu(prxstat->rxdw3) & BIT(12))
 181                        pattrib->ip_chkrpt = 1; /* correct */
 182                else
 183                        pattrib->ip_chkrpt = 0; /* incorrect */
 184        } else {
 185                pattrib->tcpchk_valid = 0; /* invalid */
 186        }
 187        pattrib->mcs_rate = (u8)((le32_to_cpu(prxstat->rxdw3)) & 0x3f);
 188        pattrib->htc = (u8)((le32_to_cpu(prxstat->rxdw3) >> 14) & 0x1);
 189        /*Offset 16*/
 190        /*Offset 20*/
 191        /*phy_info*/
 192}
 193
 194/*perform defrag*/
 195static union recv_frame *recvframe_defrag(struct _adapter *adapter,
 196                                   struct  __queue *defrag_q)
 197{
 198        struct list_head *plist, *phead;
 199        u8 wlanhdr_offset;
 200        u8      curfragnum;
 201        struct recv_frame_hdr *pfhdr, *pnfhdr;
 202        union recv_frame *prframe, *pnextrframe;
 203        struct  __queue *pfree_recv_queue;
 204
 205        pfree_recv_queue = &adapter->recvpriv.free_recv_queue;
 206        phead = &defrag_q->queue;
 207        plist = phead->next;
 208        prframe = container_of(plist, union recv_frame, u.list);
 209        list_del_init(&prframe->u.list);
 210        pfhdr = &prframe->u.hdr;
 211        curfragnum = 0;
 212        if (curfragnum != pfhdr->attrib.frag_num) {
 213                /*the first fragment number must be 0
 214                 *free the whole queue
 215                 */
 216                r8712_free_recvframe(prframe, pfree_recv_queue);
 217                r8712_free_recvframe_queue(defrag_q, pfree_recv_queue);
 218                return NULL;
 219        }
 220        curfragnum++;
 221        plist = &defrag_q->queue;
 222        plist = plist->next;
 223        while (!end_of_queue_search(phead, plist)) {
 224                pnextrframe = container_of(plist, union recv_frame, u.list);
 225                pnfhdr = &pnextrframe->u.hdr;
 226                /*check the fragment sequence  (2nd ~n fragment frame) */
 227                if (curfragnum != pnfhdr->attrib.frag_num) {
 228                        /* the fragment number must increase  (after decache)
 229                         * release the defrag_q & prframe
 230                         */
 231                        r8712_free_recvframe(prframe, pfree_recv_queue);
 232                        r8712_free_recvframe_queue(defrag_q, pfree_recv_queue);
 233                        return NULL;
 234                }
 235                curfragnum++;
 236                /* copy the 2nd~n fragment frame's payload to the first fragment
 237                 * get the 2nd~last fragment frame's payload
 238                 */
 239                wlanhdr_offset = pnfhdr->attrib.hdrlen + pnfhdr->attrib.iv_len;
 240                recvframe_pull(pnextrframe, wlanhdr_offset);
 241                /* append  to first fragment frame's tail (if privacy frame,
 242                 * pull the ICV)
 243                 */
 244                recvframe_pull_tail(prframe, pfhdr->attrib.icv_len);
 245                memcpy(pfhdr->rx_tail, pnfhdr->rx_data, pnfhdr->len);
 246                recvframe_put(prframe, pnfhdr->len);
 247                pfhdr->attrib.icv_len = pnfhdr->attrib.icv_len;
 248                plist = plist->next;
 249        }
 250        /* free the defrag_q queue and return the prframe */
 251        r8712_free_recvframe_queue(defrag_q, pfree_recv_queue);
 252        return prframe;
 253}
 254
 255/* check if need to defrag, if needed queue the frame to defrag_q */
 256union recv_frame *r8712_recvframe_chk_defrag(struct _adapter *padapter,
 257                                             union recv_frame *precv_frame)
 258{
 259        u8      ismfrag;
 260        u8      fragnum;
 261        u8   *psta_addr;
 262        struct recv_frame_hdr *pfhdr;
 263        struct sta_info *psta;
 264        struct  sta_priv *pstapriv;
 265        struct list_head *phead;
 266        union recv_frame *prtnframe = NULL;
 267        struct  __queue *pfree_recv_queue, *pdefrag_q;
 268
 269        pstapriv = &padapter->stapriv;
 270        pfhdr = &precv_frame->u.hdr;
 271        pfree_recv_queue = &padapter->recvpriv.free_recv_queue;
 272        /* need to define struct of wlan header frame ctrl */
 273        ismfrag = pfhdr->attrib.mfrag;
 274        fragnum = pfhdr->attrib.frag_num;
 275        psta_addr = pfhdr->attrib.ta;
 276        psta = r8712_get_stainfo(pstapriv, psta_addr);
 277        if (!psta)
 278                pdefrag_q = NULL;
 279        else
 280                pdefrag_q = &psta->sta_recvpriv.defrag_q;
 281
 282        if ((ismfrag == 0) && (fragnum == 0))
 283                prtnframe = precv_frame;/*isn't a fragment frame*/
 284        if (ismfrag == 1) {
 285                /* 0~(n-1) fragment frame
 286                 * enqueue to defraf_g
 287                 */
 288                if (pdefrag_q != NULL) {
 289                        if (fragnum == 0) {
 290                                /*the first fragment*/
 291                                if (!list_empty(&pdefrag_q->queue)) {
 292                                        /*free current defrag_q */
 293                                        r8712_free_recvframe_queue(pdefrag_q,
 294                                                             pfree_recv_queue);
 295                                }
 296                        }
 297                        /* Then enqueue the 0~(n-1) fragment to the defrag_q */
 298                        phead = &pdefrag_q->queue;
 299                        list_add_tail(&pfhdr->list, phead);
 300                        prtnframe = NULL;
 301                } else {
 302                        /* can't find this ta's defrag_queue, so free this
 303                         * recv_frame
 304                         */
 305                        r8712_free_recvframe(precv_frame, pfree_recv_queue);
 306                        prtnframe = NULL;
 307                }
 308
 309        }
 310        if ((ismfrag == 0) && (fragnum != 0)) {
 311                /* the last fragment frame
 312                 * enqueue the last fragment
 313                 */
 314                if (pdefrag_q != NULL) {
 315                        phead = &pdefrag_q->queue;
 316                        list_add_tail(&pfhdr->list, phead);
 317                        /*call recvframe_defrag to defrag*/
 318                        precv_frame = recvframe_defrag(padapter, pdefrag_q);
 319                        prtnframe = precv_frame;
 320                } else {
 321                        /* can't find this ta's defrag_queue, so free this
 322                         *  recv_frame
 323                         */
 324                        r8712_free_recvframe(precv_frame, pfree_recv_queue);
 325                        prtnframe = NULL;
 326                }
 327        }
 328        if ((prtnframe != NULL) && (prtnframe->u.hdr.attrib.privacy)) {
 329                /* after defrag we must check tkip mic code */
 330                if (r8712_recvframe_chkmic(padapter, prtnframe) == _FAIL) {
 331                        r8712_free_recvframe(prtnframe, pfree_recv_queue);
 332                        prtnframe = NULL;
 333                }
 334        }
 335        return prtnframe;
 336}
 337
 338static int amsdu_to_msdu(struct _adapter *padapter, union recv_frame *prframe)
 339{
 340        int     a_len, padding_len;
 341        u16     eth_type, nSubframe_Length;
 342        u8      nr_subframes, i;
 343        unsigned char *pdata;
 344        struct rx_pkt_attrib *pattrib;
 345        _pkt *sub_skb, *subframes[MAX_SUBFRAME_COUNT];
 346        struct recv_priv *precvpriv = &padapter->recvpriv;
 347        struct  __queue *pfree_recv_queue = &(precvpriv->free_recv_queue);
 348
 349        nr_subframes = 0;
 350        pattrib = &prframe->u.hdr.attrib;
 351        recvframe_pull(prframe, prframe->u.hdr.attrib.hdrlen);
 352        if (prframe->u.hdr.attrib.iv_len > 0)
 353                recvframe_pull(prframe, prframe->u.hdr.attrib.iv_len);
 354        a_len = prframe->u.hdr.len;
 355        pdata = prframe->u.hdr.rx_data;
 356        while (a_len > ETH_HLEN) {
 357                /* Offset 12 denote 2 mac address */
 358                nSubframe_Length = *((u16 *)(pdata + 12));
 359                /*==m==>change the length order*/
 360                nSubframe_Length = (nSubframe_Length >> 8) +
 361                                   (nSubframe_Length << 8);
 362                if (a_len < (ETHERNET_HEADER_SIZE + nSubframe_Length)) {
 363                        netdev_warn(padapter->pnetdev, "r8712u: nRemain_Length is %d and nSubframe_Length is: %d\n",
 364                                    a_len, nSubframe_Length);
 365                        goto exit;
 366                }
 367                /* move the data point to data content */
 368                pdata += ETH_HLEN;
 369                a_len -= ETH_HLEN;
 370                /* Allocate new skb for releasing to upper layer */
 371                sub_skb = dev_alloc_skb(nSubframe_Length + 12);
 372                if (!sub_skb)
 373                        break;
 374                skb_reserve(sub_skb, 12);
 375                skb_put_data(sub_skb, pdata, nSubframe_Length);
 376                subframes[nr_subframes++] = sub_skb;
 377                if (nr_subframes >= MAX_SUBFRAME_COUNT) {
 378                        netdev_warn(padapter->pnetdev, "r8712u: ParseSubframe(): Too many Subframes! Packets dropped!\n");
 379                        break;
 380                }
 381                pdata += nSubframe_Length;
 382                a_len -= nSubframe_Length;
 383                if (a_len != 0) {
 384                        padding_len = 4 - ((nSubframe_Length + ETH_HLEN) & 3);
 385                        if (padding_len == 4)
 386                                padding_len = 0;
 387                        if (a_len < padding_len)
 388                                goto exit;
 389                        pdata += padding_len;
 390                        a_len -= padding_len;
 391                }
 392        }
 393        for (i = 0; i < nr_subframes; i++) {
 394                sub_skb = subframes[i];
 395                /* convert hdr + possible LLC headers into Ethernet header */
 396                eth_type = (sub_skb->data[6] << 8) | sub_skb->data[7];
 397                if (sub_skb->len >= 8 &&
 398                   ((!memcmp(sub_skb->data, rfc1042_header, SNAP_SIZE) &&
 399                   eth_type != ETH_P_AARP && eth_type != ETH_P_IPX) ||
 400                   !memcmp(sub_skb->data, bridge_tunnel_header, SNAP_SIZE))) {
 401                        /* remove RFC1042 or Bridge-Tunnel encapsulation and
 402                         * replace EtherType
 403                         */
 404                        skb_pull(sub_skb, SNAP_SIZE);
 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                } else {
 410                        __be16 len;
 411                        /* Leave Ethernet header part of hdr and full payload */
 412                        len = htons(sub_skb->len);
 413                        memcpy(skb_push(sub_skb, 2), &len, 2);
 414                        memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->src,
 415                                ETH_ALEN);
 416                        memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->dst,
 417                                ETH_ALEN);
 418                }
 419                /* Indicate the packets to upper layer */
 420                if (sub_skb) {
 421                        sub_skb->protocol =
 422                                 eth_type_trans(sub_skb, padapter->pnetdev);
 423                        sub_skb->dev = padapter->pnetdev;
 424                        if ((pattrib->tcpchk_valid == 1) &&
 425                            (pattrib->tcp_chkrpt == 1)) {
 426                                sub_skb->ip_summed = CHECKSUM_UNNECESSARY;
 427                        } else {
 428                                sub_skb->ip_summed = CHECKSUM_NONE;
 429                        }
 430                        netif_rx(sub_skb);
 431                }
 432        }
 433exit:
 434        prframe->u.hdr.len = 0;
 435        r8712_free_recvframe(prframe, pfree_recv_queue);
 436        return _SUCCESS;
 437}
 438
 439void r8712_rxcmd_event_hdl(struct _adapter *padapter, void *prxcmdbuf)
 440{
 441        __le32 voffset;
 442        u8 *poffset;
 443        u16 cmd_len, drvinfo_sz;
 444        struct recv_stat *prxstat;
 445
 446        poffset = prxcmdbuf;
 447        voffset = *(__le32 *)poffset;
 448        prxstat = prxcmdbuf;
 449        drvinfo_sz = (le32_to_cpu(prxstat->rxdw0) & 0x000f0000) >> 16;
 450        drvinfo_sz <<= 3;
 451        poffset += RXDESC_SIZE + drvinfo_sz;
 452        do {
 453                voffset  = *(__le32 *)poffset;
 454                cmd_len = (u16)(le32_to_cpu(voffset) & 0xffff);
 455                r8712_event_handle(padapter, (__le32 *)poffset);
 456                poffset += (cmd_len + 8);/*8 bytes alignment*/
 457        } while (le32_to_cpu(voffset) & BIT(31));
 458
 459}
 460
 461static int check_indicate_seq(struct recv_reorder_ctrl *preorder_ctrl,
 462                              u16 seq_num)
 463{
 464        u8 wsize = preorder_ctrl->wsize_b;
 465        u16 wend = (preorder_ctrl->indicate_seq + wsize - 1) % 4096;
 466
 467        /* Rx Reorder initialize condition.*/
 468        if (preorder_ctrl->indicate_seq == 0xffff)
 469                preorder_ctrl->indicate_seq = seq_num;
 470        /* Drop out the packet which SeqNum is smaller than WinStart */
 471        if (SN_LESS(seq_num, preorder_ctrl->indicate_seq))
 472                return false;
 473        /*
 474         * Sliding window manipulation. Conditions includes:
 475         * 1. Incoming SeqNum is equal to WinStart =>Window shift 1
 476         * 2. Incoming SeqNum is larger than the WinEnd => Window shift N
 477         */
 478        if (SN_EQUAL(seq_num, preorder_ctrl->indicate_seq))
 479                preorder_ctrl->indicate_seq = (preorder_ctrl->indicate_seq +
 480                                              1) % 4096;
 481        else if (SN_LESS(wend, seq_num)) {
 482                if (seq_num >= (wsize - 1))
 483                        preorder_ctrl->indicate_seq = seq_num + 1 - wsize;
 484                else
 485                        preorder_ctrl->indicate_seq = 4095 - (wsize -
 486                                                      (seq_num + 1)) + 1;
 487        }
 488        return true;
 489}
 490
 491static int enqueue_reorder_recvframe(struct recv_reorder_ctrl *preorder_ctrl,
 492                              union recv_frame *prframe)
 493{
 494        struct list_head *phead, *plist;
 495        union recv_frame *pnextrframe;
 496        struct rx_pkt_attrib *pnextattrib;
 497        struct  __queue *ppending_recvframe_queue =
 498                                        &preorder_ctrl->pending_recvframe_queue;
 499        struct rx_pkt_attrib *pattrib = &prframe->u.hdr.attrib;
 500
 501        phead = &ppending_recvframe_queue->queue;
 502        plist = phead->next;
 503        while (!end_of_queue_search(phead, plist)) {
 504                pnextrframe = container_of(plist, union recv_frame, u.list);
 505                pnextattrib = &pnextrframe->u.hdr.attrib;
 506                if (SN_LESS(pnextattrib->seq_num, pattrib->seq_num))
 507                        plist = plist->next;
 508                else if (SN_EQUAL(pnextattrib->seq_num, pattrib->seq_num))
 509                        return false;
 510                else
 511                        break;
 512        }
 513        list_del_init(&(prframe->u.hdr.list));
 514        list_add_tail(&(prframe->u.hdr.list), plist);
 515        return true;
 516}
 517
 518int r8712_recv_indicatepkts_in_order(struct _adapter *padapter,
 519                               struct recv_reorder_ctrl *preorder_ctrl,
 520                               int bforced)
 521{
 522        struct list_head *phead, *plist;
 523        union recv_frame *prframe;
 524        struct rx_pkt_attrib *pattrib;
 525        int bPktInBuf = false;
 526        struct recv_priv *precvpriv = &padapter->recvpriv;
 527        struct  __queue *ppending_recvframe_queue =
 528                         &preorder_ctrl->pending_recvframe_queue;
 529
 530        phead = &ppending_recvframe_queue->queue;
 531        plist = phead->next;
 532        /* Handling some condition for forced indicate case.*/
 533        if (bforced) {
 534                if (list_empty(phead))
 535                        return true;
 536
 537                prframe = container_of(plist, union recv_frame, u.list);
 538                pattrib = &prframe->u.hdr.attrib;
 539                preorder_ctrl->indicate_seq = pattrib->seq_num;
 540        }
 541        /* Prepare indication list and indication.
 542         * Check if there is any packet need indicate.
 543         */
 544        while (!list_empty(phead)) {
 545                prframe = container_of(plist, union recv_frame, u.list);
 546                pattrib = &prframe->u.hdr.attrib;
 547                if (!SN_LESS(preorder_ctrl->indicate_seq, pattrib->seq_num)) {
 548                        plist = plist->next;
 549                        list_del_init(&(prframe->u.hdr.list));
 550                        if (SN_EQUAL(preorder_ctrl->indicate_seq,
 551                            pattrib->seq_num))
 552                                preorder_ctrl->indicate_seq =
 553                                  (preorder_ctrl->indicate_seq + 1) % 4096;
 554                        /*indicate this recv_frame*/
 555                        if (!pattrib->amsdu) {
 556                                if (!padapter->bDriverStopped &&
 557                                    !padapter->bSurpriseRemoved) {
 558                                        /* indicate this recv_frame */
 559                                        r8712_recv_indicatepkt(padapter,
 560                                                               prframe);
 561                                }
 562                        } else if (pattrib->amsdu == 1) {
 563                                if (amsdu_to_msdu(padapter, prframe) !=
 564                                    _SUCCESS)
 565                                        r8712_free_recvframe(prframe,
 566                                                   &precvpriv->free_recv_queue);
 567                        }
 568                        /* Update local variables. */
 569                        bPktInBuf = false;
 570                } else {
 571                        bPktInBuf = true;
 572                        break;
 573                }
 574        }
 575        return bPktInBuf;
 576}
 577
 578static int recv_indicatepkt_reorder(struct _adapter *padapter,
 579                             union recv_frame *prframe)
 580{
 581        unsigned long irql;
 582        struct rx_pkt_attrib *pattrib = &prframe->u.hdr.attrib;
 583        struct recv_reorder_ctrl *preorder_ctrl = prframe->u.hdr.preorder_ctrl;
 584        struct  __queue *ppending_recvframe_queue =
 585                         &preorder_ctrl->pending_recvframe_queue;
 586
 587        if (!pattrib->amsdu) {
 588                /* s1. */
 589                r8712_wlanhdr_to_ethhdr(prframe);
 590                if (pattrib->qos != 1) {
 591                        if (!padapter->bDriverStopped &&
 592                            !padapter->bSurpriseRemoved) {
 593                                r8712_recv_indicatepkt(padapter, prframe);
 594                                return _SUCCESS;
 595                        } else {
 596                                return _FAIL;
 597                        }
 598                }
 599        }
 600        spin_lock_irqsave(&ppending_recvframe_queue->lock, irql);
 601        /*s2. check if winstart_b(indicate_seq) needs to be updated*/
 602        if (!check_indicate_seq(preorder_ctrl, pattrib->seq_num))
 603                goto _err_exit;
 604        /*s3. Insert all packet into Reorder Queue to maintain its ordering.*/
 605        if (!enqueue_reorder_recvframe(preorder_ctrl, prframe))
 606                goto _err_exit;
 607        /*s4.
 608         * Indication process.
 609         * After Packet dropping and Sliding Window shifting as above, we can
 610         * now just indicate the packets with the SeqNum smaller than latest
 611         * WinStart and buffer other packets.
 612         *
 613         * For Rx Reorder condition:
 614         * 1. All packets with SeqNum smaller than WinStart => Indicate
 615         * 2. All packets with SeqNum larger than or equal to
 616         * WinStart => Buffer it.
 617         */
 618        if (r8712_recv_indicatepkts_in_order(padapter, preorder_ctrl, false) ==
 619            true) {
 620                mod_timer(&preorder_ctrl->reordering_ctrl_timer,
 621                          jiffies + msecs_to_jiffies(REORDER_WAIT_TIME));
 622                spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
 623        } else {
 624                spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
 625                del_timer(&preorder_ctrl->reordering_ctrl_timer);
 626        }
 627        return _SUCCESS;
 628_err_exit:
 629        spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
 630        return _FAIL;
 631}
 632
 633void r8712_reordering_ctrl_timeout_handler(void *pcontext)
 634{
 635        unsigned long irql;
 636        struct recv_reorder_ctrl *preorder_ctrl = pcontext;
 637        struct _adapter *padapter = preorder_ctrl->padapter;
 638        struct  __queue *ppending_recvframe_queue =
 639                                 &preorder_ctrl->pending_recvframe_queue;
 640
 641        if (padapter->bDriverStopped || padapter->bSurpriseRemoved)
 642                return;
 643        spin_lock_irqsave(&ppending_recvframe_queue->lock, irql);
 644        r8712_recv_indicatepkts_in_order(padapter, preorder_ctrl, true);
 645        spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
 646}
 647
 648static int r8712_process_recv_indicatepkts(struct _adapter *padapter,
 649                              union recv_frame *prframe)
 650{
 651        int retval = _SUCCESS;
 652        struct mlme_priv *pmlmepriv = &padapter->mlmepriv;
 653        struct ht_priv  *phtpriv = &pmlmepriv->htpriv;
 654
 655        if (phtpriv->ht_option == 1) { /*B/G/N Mode*/
 656                if (recv_indicatepkt_reorder(padapter, prframe) != _SUCCESS) {
 657                        /* including perform A-MPDU Rx Ordering Buffer Control*/
 658                        if (!padapter->bDriverStopped &&
 659                            !padapter->bSurpriseRemoved)
 660                                return _FAIL;
 661                }
 662        } else { /*B/G mode*/
 663                retval = r8712_wlanhdr_to_ethhdr(prframe);
 664                if (retval != _SUCCESS)
 665                        return retval;
 666                if (!padapter->bDriverStopped && !padapter->bSurpriseRemoved) {
 667                        /* indicate this recv_frame */
 668                        r8712_recv_indicatepkt(padapter, prframe);
 669                } else {
 670                        return _FAIL;
 671                }
 672        }
 673        return retval;
 674}
 675
 676static u8 query_rx_pwr_percentage(s8 antpower)
 677{
 678        if ((antpower <= -100) || (antpower >= 20))
 679                return  0;
 680        else if (antpower >= 0)
 681                return  100;
 682        else
 683                return 100 + antpower;
 684}
 685
 686static u8 evm_db2percentage(s8 value)
 687{
 688        /*
 689         * -33dB~0dB to 0%~99%
 690         */
 691        s8 ret_val;
 692
 693        ret_val = value;
 694        if (ret_val >= 0)
 695                ret_val = 0;
 696        if (ret_val <= -33)
 697                ret_val = -33;
 698        ret_val = -ret_val;
 699        ret_val *= 3;
 700        if (ret_val == 99)
 701                ret_val = 100;
 702        return ret_val;
 703}
 704
 705s32 r8712_signal_scale_mapping(s32 cur_sig)
 706{
 707        s32 ret_sig;
 708
 709        if (cur_sig >= 51 && cur_sig <= 100)
 710                ret_sig = 100;
 711        else if (cur_sig >= 41 && cur_sig <= 50)
 712                ret_sig = 80 + ((cur_sig - 40) * 2);
 713        else if (cur_sig >= 31 && cur_sig <= 40)
 714                ret_sig = 66 + (cur_sig - 30);
 715        else if (cur_sig >= 21 && cur_sig <= 30)
 716                ret_sig = 54 + (cur_sig - 20);
 717        else if (cur_sig >= 10 && cur_sig <= 20)
 718                ret_sig = 42 + (((cur_sig - 10) * 2) / 3);
 719        else if (cur_sig >= 5 && cur_sig <= 9)
 720                ret_sig = 22 + (((cur_sig - 5) * 3) / 2);
 721        else if (cur_sig >= 1 && cur_sig <= 4)
 722                ret_sig = 6 + (((cur_sig - 1) * 3) / 2);
 723        else
 724                ret_sig = cur_sig;
 725        return ret_sig;
 726}
 727
 728static s32  translate2dbm(struct _adapter *padapter, u8 signal_strength_idx)
 729{
 730        s32 signal_power; /* in dBm.*/
 731        /* Translate to dBm (x=0.5y-95).*/
 732        signal_power = (s32)((signal_strength_idx + 1) >> 1);
 733        signal_power -= 95;
 734        return signal_power;
 735}
 736
 737static void query_rx_phy_status(struct _adapter *padapter,
 738                                union recv_frame *prframe)
 739{
 740        u8 i, max_spatial_stream, evm;
 741        struct recv_stat *prxstat = (struct recv_stat *)prframe->u.hdr.rx_head;
 742        struct phy_stat *pphy_stat = (struct phy_stat *)(prxstat + 1);
 743        u8 *pphy_head = (u8 *)(prxstat + 1);
 744        s8 rx_pwr[4], rx_pwr_all;
 745        u8 pwdb_all;
 746        u32 rssi, total_rssi = 0;
 747        u8 bcck_rate = 0, rf_rx_num = 0, cck_highpwr = 0;
 748        struct phy_cck_rx_status *pcck_buf;
 749        u8 sq;
 750
 751        /* Record it for next packet processing*/
 752        bcck_rate = (prframe->u.hdr.attrib.mcs_rate <= 3 ? 1 : 0);
 753        if (bcck_rate) {
 754                u8 report;
 755
 756                /* CCK Driver info Structure is not the same as OFDM packet.*/
 757                pcck_buf = (struct phy_cck_rx_status *)pphy_stat;
 758                /* (1)Hardware does not provide RSSI for CCK
 759                 * (2)PWDB, Average PWDB calculated by hardware
 760                 * (for rate adaptive)
 761                 */
 762                if (!cck_highpwr) {
 763                        report = pcck_buf->cck_agc_rpt & 0xc0;
 764                        report >>= 6;
 765                        switch (report) {
 766                        /* Modify the RF RNA gain value to -40, -20,
 767                         * -2, 14 by Jenyu's suggestion
 768                         * Note: different RF with the different
 769                         * RNA gain.
 770                         */
 771                        case 0x3:
 772                                rx_pwr_all = -40 - (pcck_buf->cck_agc_rpt &
 773                                             0x3e);
 774                                break;
 775                        case 0x2:
 776                                rx_pwr_all = -20 - (pcck_buf->cck_agc_rpt &
 777                                             0x3e);
 778                                break;
 779                        case 0x1:
 780                                rx_pwr_all = -2 - (pcck_buf->cck_agc_rpt &
 781                                             0x3e);
 782                                break;
 783                        case 0x0:
 784                                rx_pwr_all = 14 - (pcck_buf->cck_agc_rpt &
 785                                             0x3e);
 786                                break;
 787                        }
 788                } else {
 789                        report = ((u8)(le32_to_cpu(pphy_stat->phydw1) >> 8)) &
 790                                 0x60;
 791                        report >>= 5;
 792                        switch (report) {
 793                        case 0x3:
 794                                rx_pwr_all = -40 - ((pcck_buf->cck_agc_rpt &
 795                                             0x1f) << 1);
 796                                break;
 797                        case 0x2:
 798                                rx_pwr_all = -20 - ((pcck_buf->cck_agc_rpt &
 799                                             0x1f) << 1);
 800                                break;
 801                        case 0x1:
 802                                rx_pwr_all = -2 - ((pcck_buf->cck_agc_rpt &
 803                                             0x1f) << 1);
 804                                break;
 805                        case 0x0:
 806                                rx_pwr_all = 14 - ((pcck_buf->cck_agc_rpt &
 807                                             0x1f) << 1);
 808                                break;
 809                        }
 810                }
 811                pwdb_all = query_rx_pwr_percentage(rx_pwr_all);
 812                /* CCK gain is smaller than OFDM/MCS gain,*/
 813                /* so we add gain diff by experiences, the val is 6 */
 814                pwdb_all += 6;
 815                if (pwdb_all > 100)
 816                        pwdb_all = 100;
 817                /* modify the offset to make the same gain index with OFDM.*/
 818                if (pwdb_all > 34 && pwdb_all <= 42)
 819                        pwdb_all -= 2;
 820                else if (pwdb_all > 26 && pwdb_all <= 34)
 821                        pwdb_all -= 6;
 822                else if (pwdb_all > 14 && pwdb_all <= 26)
 823                        pwdb_all -= 8;
 824                else if (pwdb_all > 4 && pwdb_all <= 14)
 825                        pwdb_all -= 4;
 826                /*
 827                 * (3) Get Signal Quality (EVM)
 828                 */
 829                if (pwdb_all > 40) {
 830                        sq = 100;
 831                } else {
 832                        sq = pcck_buf->sq_rpt;
 833                        if (pcck_buf->sq_rpt > 64)
 834                                sq = 0;
 835                        else if (pcck_buf->sq_rpt < 20)
 836                                sq = 100;
 837                        else
 838                                sq = ((64 - sq) * 100) / 44;
 839                }
 840                prframe->u.hdr.attrib.signal_qual = sq;
 841                prframe->u.hdr.attrib.rx_mimo_signal_qual[0] = sq;
 842                prframe->u.hdr.attrib.rx_mimo_signal_qual[1] = -1;
 843        } else {
 844                /* (1)Get RSSI for HT rate */
 845                for (i = 0; i < ((padapter->registrypriv.rf_config) &
 846                            0x0f); i++) {
 847                        rf_rx_num++;
 848                        rx_pwr[i] = ((pphy_head[PHY_STAT_GAIN_TRSW_SHT + i]
 849                                    & 0x3F) * 2) - 110;
 850                        /* Translate DBM to percentage. */
 851                        rssi = query_rx_pwr_percentage(rx_pwr[i]);
 852                        total_rssi += rssi;
 853                }
 854                /* (2)PWDB, Average PWDB calculated by hardware (for
 855                 * rate adaptive)
 856                 */
 857                rx_pwr_all = (((pphy_head[PHY_STAT_PWDB_ALL_SHT]) >> 1) & 0x7f)
 858                             - 106;
 859                pwdb_all = query_rx_pwr_percentage(rx_pwr_all);
 860
 861                {
 862                        /* (3)EVM of HT rate */
 863                        if (prframe->u.hdr.attrib.htc &&
 864                            prframe->u.hdr.attrib.mcs_rate >= 20 &&
 865                            prframe->u.hdr.attrib.mcs_rate <= 27) {
 866                                /* both spatial stream make sense */
 867                                max_spatial_stream = 2;
 868                        } else {
 869                                /* only spatial stream 1 makes sense */
 870                                max_spatial_stream = 1;
 871                        }
 872                        for (i = 0; i < max_spatial_stream; i++) {
 873                                evm = evm_db2percentage((pphy_head
 874                                      [PHY_STAT_RXEVM_SHT + i]));/*dbm*/
 875                                prframe->u.hdr.attrib.signal_qual =
 876                                         (u8)(evm & 0xff);
 877                                prframe->u.hdr.attrib.rx_mimo_signal_qual[i] =
 878                                         (u8)(evm & 0xff);
 879                        }
 880                }
 881        }
 882        /* UI BSS List signal strength(in percentage), make it good looking,
 883         * from 0~100. It is assigned to the BSS List in
 884         * GetValueFromBeaconOrProbeRsp().
 885         */
 886        if (bcck_rate) {
 887                prframe->u.hdr.attrib.signal_strength =
 888                         (u8)r8712_signal_scale_mapping(pwdb_all);
 889        } else {
 890                if (rf_rx_num != 0)
 891                        prframe->u.hdr.attrib.signal_strength =
 892                                 (u8)(r8712_signal_scale_mapping(total_rssi /=
 893                                 rf_rx_num));
 894        }
 895}
 896
 897static void process_link_qual(struct _adapter *padapter,
 898                              union recv_frame *prframe)
 899{
 900        u32     last_evm = 0, tmpVal;
 901        struct rx_pkt_attrib *pattrib;
 902        struct smooth_rssi_data *sqd = &padapter->recvpriv.signal_qual_data;
 903
 904        if (prframe == NULL || padapter == NULL)
 905                return;
 906        pattrib = &prframe->u.hdr.attrib;
 907        if (pattrib->signal_qual != 0) {
 908                /*
 909                 * 1. Record the general EVM to the sliding window.
 910                 */
 911                if (sqd->total_num++ >= PHY_LINKQUALITY_SLID_WIN_MAX) {
 912                        sqd->total_num = PHY_LINKQUALITY_SLID_WIN_MAX;
 913                        last_evm = sqd->elements[sqd->index];
 914                        sqd->total_val -= last_evm;
 915                }
 916                sqd->total_val += pattrib->signal_qual;
 917                sqd->elements[sqd->index++] = pattrib->signal_qual;
 918                if (sqd->index >= PHY_LINKQUALITY_SLID_WIN_MAX)
 919                        sqd->index = 0;
 920
 921                /* <1> Showed on UI for user, in percentage. */
 922                tmpVal = sqd->total_val / sqd->total_num;
 923                padapter->recvpriv.signal = (u8)tmpVal;
 924        }
 925}
 926
 927static void process_rssi(struct _adapter *padapter, union recv_frame *prframe)
 928{
 929        u32 last_rssi, tmp_val;
 930        struct rx_pkt_attrib *pattrib = &prframe->u.hdr.attrib;
 931        struct smooth_rssi_data *ssd = &padapter->recvpriv.signal_strength_data;
 932
 933        if (ssd->total_num++ >= PHY_RSSI_SLID_WIN_MAX) {
 934                ssd->total_num = PHY_RSSI_SLID_WIN_MAX;
 935                last_rssi = ssd->elements[ssd->index];
 936                ssd->total_val -= last_rssi;
 937        }
 938        ssd->total_val += pattrib->signal_strength;
 939        ssd->elements[ssd->index++] = pattrib->signal_strength;
 940        if (ssd->index >= PHY_RSSI_SLID_WIN_MAX)
 941                ssd->index = 0;
 942        tmp_val = ssd->total_val / ssd->total_num;
 943        padapter->recvpriv.rssi = (s8)translate2dbm(padapter, (u8)tmp_val);
 944}
 945
 946static void process_phy_info(struct _adapter *padapter,
 947                             union recv_frame *prframe)
 948{
 949        query_rx_phy_status(padapter, prframe);
 950        process_rssi(padapter, prframe);
 951        process_link_qual(padapter,  prframe);
 952}
 953
 954int recv_func(struct _adapter *padapter, void *pcontext)
 955{
 956        struct rx_pkt_attrib *pattrib;
 957        union recv_frame *prframe, *orig_prframe;
 958        int retval = _SUCCESS;
 959        struct  __queue *pfree_recv_queue = &padapter->recvpriv.free_recv_queue;
 960        struct  mlme_priv       *pmlmepriv = &padapter->mlmepriv;
 961
 962        prframe = pcontext;
 963        orig_prframe = prframe;
 964        pattrib = &prframe->u.hdr.attrib;
 965        if (check_fwstate(pmlmepriv, WIFI_MP_STATE)) {
 966                if (pattrib->crc_err == 1)
 967                        padapter->mppriv.rx_crcerrpktcount++;
 968                else
 969                        padapter->mppriv.rx_pktcount++;
 970                if (!check_fwstate(pmlmepriv, WIFI_MP_LPBK_STATE)) {
 971                        /* free this recv_frame */
 972                        r8712_free_recvframe(orig_prframe, pfree_recv_queue);
 973                        goto _exit_recv_func;
 974                }
 975        }
 976        /* check the frame crtl field and decache */
 977        retval = r8712_validate_recv_frame(padapter, prframe);
 978        if (retval != _SUCCESS) {
 979                /* free this recv_frame */
 980                r8712_free_recvframe(orig_prframe, pfree_recv_queue);
 981                goto _exit_recv_func;
 982        }
 983        process_phy_info(padapter, prframe);
 984        prframe = r8712_decryptor(padapter, prframe);
 985        if (!prframe) {
 986                retval = _FAIL;
 987                goto _exit_recv_func;
 988        }
 989        prframe = r8712_recvframe_chk_defrag(padapter, prframe);
 990        if (!prframe)
 991                goto _exit_recv_func;
 992        prframe = r8712_portctrl(padapter, prframe);
 993        if (!prframe) {
 994                retval = _FAIL;
 995                goto _exit_recv_func;
 996        }
 997        retval = r8712_process_recv_indicatepkts(padapter, prframe);
 998        if (retval != _SUCCESS) {
 999                r8712_free_recvframe(orig_prframe, pfree_recv_queue);
1000                goto _exit_recv_func;
1001        }
1002_exit_recv_func:
1003        return retval;
1004}
1005
1006static int recvbuf2recvframe(struct _adapter *padapter, struct sk_buff *pskb)
1007{
1008        u8 *pbuf, shift_sz = 0;
1009        u8      frag, mf;
1010        uint    pkt_len;
1011        u32 transfer_len;
1012        struct recv_stat *prxstat;
1013        u16     pkt_cnt, drvinfo_sz, pkt_offset, tmp_len, alloc_sz;
1014        struct  __queue *pfree_recv_queue;
1015        _pkt  *pkt_copy = NULL;
1016        union recv_frame *precvframe = NULL;
1017        struct recv_priv *precvpriv = &padapter->recvpriv;
1018
1019        pfree_recv_queue = &(precvpriv->free_recv_queue);
1020        pbuf = pskb->data;
1021        prxstat = (struct recv_stat *)pbuf;
1022        pkt_cnt = (le32_to_cpu(prxstat->rxdw2) >> 16) & 0xff;
1023        pkt_len =  le32_to_cpu(prxstat->rxdw0) & 0x00003fff;
1024        transfer_len = pskb->len;
1025        /* Test throughput with Netgear 3700 (No security) with Chariot 3T3R
1026         * pairs. The packet count will be a big number so that the containing
1027         * packet will effect the Rx reordering.
1028         */
1029        if (transfer_len < pkt_len) {
1030                /* In this case, it means the MAX_RECVBUF_SZ is too small to
1031                 * get the data from 8712u.
1032                 */
1033                return _FAIL;
1034        }
1035        do {
1036                prxstat = (struct recv_stat *)pbuf;
1037                pkt_len =  le32_to_cpu(prxstat->rxdw0) & 0x00003fff;
1038                /* more fragment bit */
1039                mf = (le32_to_cpu(prxstat->rxdw1) >> 27) & 0x1;
1040                /* ragmentation number */
1041                frag = (le32_to_cpu(prxstat->rxdw2) >> 12) & 0xf;
1042                /* uint 2^3 = 8 bytes */
1043                drvinfo_sz = (le32_to_cpu(prxstat->rxdw0) & 0x000f0000) >> 16;
1044                drvinfo_sz <<= 3;
1045                if (pkt_len <= 0)
1046                        goto  _exit_recvbuf2recvframe;
1047                /* Qos data, wireless lan header length is 26 */
1048                if ((le32_to_cpu(prxstat->rxdw0) >> 23) & 0x01)
1049                        shift_sz = 2;
1050                precvframe = r8712_alloc_recvframe(pfree_recv_queue);
1051                if (!precvframe)
1052                        goto  _exit_recvbuf2recvframe;
1053                INIT_LIST_HEAD(&precvframe->u.hdr.list);
1054                precvframe->u.hdr.precvbuf = NULL; /*can't access the precvbuf*/
1055                precvframe->u.hdr.len = 0;
1056                tmp_len = pkt_len + drvinfo_sz + RXDESC_SIZE;
1057                pkt_offset = (u16)round_up(tmp_len, 128);
1058                /* for first fragment packet, driver need allocate 1536 +
1059                 * drvinfo_sz + RXDESC_SIZE to defrag packet.
1060                 */
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                 */
1069                alloc_sz += 6;
1070                pkt_copy = netdev_alloc_skb(padapter->pnetdev, alloc_sz);
1071                if (pkt_copy) {
1072                        precvframe->u.hdr.pkt = pkt_copy;
1073                        skb_reserve(pkt_copy, 4 - ((addr_t)(pkt_copy->data)
1074                                    % 4));
1075                        skb_reserve(pkt_copy, shift_sz);
1076                        memcpy(pkt_copy->data, pbuf, tmp_len);
1077                        precvframe->u.hdr.rx_head = precvframe->u.hdr.rx_data =
1078                                 precvframe->u.hdr.rx_tail = pkt_copy->data;
1079                        precvframe->u.hdr.rx_end = pkt_copy->data + alloc_sz;
1080                } else {
1081                        precvframe->u.hdr.pkt = skb_clone(pskb, GFP_ATOMIC);
1082                        if (!precvframe->u.hdr.pkt)
1083                                return _FAIL;
1084                        precvframe->u.hdr.rx_head = pbuf;
1085                        precvframe->u.hdr.rx_data = pbuf;
1086                        precvframe->u.hdr.rx_tail = pbuf;
1087                        precvframe->u.hdr.rx_end = pbuf + alloc_sz;
1088                }
1089                recvframe_put(precvframe, tmp_len);
1090                recvframe_pull(precvframe, drvinfo_sz + RXDESC_SIZE);
1091                /* because the endian issue, driver avoid reference to the
1092                 * rxstat after calling update_recvframe_attrib_from_recvstat();
1093                 */
1094                update_recvframe_attrib_from_recvstat(&precvframe->u.hdr.attrib,
1095                                                      prxstat);
1096                r8712_recv_entry(precvframe);
1097                transfer_len -= pkt_offset;
1098                pbuf += pkt_offset;
1099                pkt_cnt--;
1100                precvframe = NULL;
1101                pkt_copy = NULL;
1102        } while ((transfer_len > 0) && pkt_cnt > 0);
1103_exit_recvbuf2recvframe:
1104        return _SUCCESS;
1105}
1106
1107static void recv_tasklet(void *priv)
1108{
1109        struct sk_buff *pskb;
1110        struct _adapter *padapter = priv;
1111        struct recv_priv *precvpriv = &padapter->recvpriv;
1112
1113        while (NULL != (pskb = skb_dequeue(&precvpriv->rx_skb_queue))) {
1114                recvbuf2recvframe(padapter, pskb);
1115                skb_reset_tail_pointer(pskb);
1116                pskb->len = 0;
1117                if (!skb_cloned(pskb))
1118                        skb_queue_tail(&precvpriv->free_recv_skb_queue, pskb);
1119                else
1120                        consume_skb(pskb);
1121        }
1122}
1123