drivers/staging/rtl8712/rtl8712

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
r8712_init_recv_priv
r8712_free_recv_priv
r8712_init_recvbuf
r8712_free_recvframe
update_recvframe_attrib_from_recvstat
recvframe_defrag
r8712_recvframe_chk_defrag
amsdu_to_msdu
r8712_rxcmd_event_hdl
check_indicate_seq
enqueue_reorder_recvframe
r8712_recv_indicatepkts_in_order
recv_indicatepkt_reorder
r8712_reordering_ctrl_timeout_handler
r8712_process_recv_indicatepkts
query_rx_pwr_percentage
evm_db2percentage
r8712_signal_scale_mapping
translate2dbm
query_rx_phy_status
process_link_qual
process_rssi
process_phy_info
recv_func
recvbuf2recvframe
recv_tasklet
   1 // SPDX-License-Identifier: GPL-2.0
   2 /******************************************************************************
   3  * rtl8712_recv.c
   4  *
   5  * Copyright(c) 2007 - 2010 Realtek Corporation. All rights reserved.
   6  * Linux device driver for RTL8192SU
   7  *
   8  * Modifications for inclusion into the Linux staging tree are
   9  * Copyright(c) 2010 Larry Finger. All rights reserved.
  10  *
  11  * Contact information:
  12  * WLAN FAE <wlanfae@realtek.com>
  13  * Larry Finger <Larry.Finger@lwfinger.net>
  14  *
  15  ******************************************************************************/
  16 
  17 #define _RTL8712_RECV_C_
  18 
  19 #include <linux/if_ether.h>
  20 #include <linux/ip.h>
  21 
  22 #include "osdep_service.h"
  23 #include "drv_types.h"
  24 #include "recv_osdep.h"
  25 #include "mlme_osdep.h"
  26 #include "ethernet.h"
  27 #include "usb_ops.h"
  28 #include "wifi.h"
  29 
  30 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
  31 static u8 bridge_tunnel_header[] = {0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8};
  32 
  33 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
  34 static u8 rfc1042_header[] = {0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00};
  35 
  36 static void recv_tasklet(void *priv);
  37 
  38 void r8712_init_recv_priv(struct recv_priv *precvpriv,
  39                           struct _adapter *padapter)
  40 {
  41         int i;
  42         struct recv_buf *precvbuf;
  43         addr_t tmpaddr = 0;
  44         int alignment = 0;
  45         struct sk_buff *pskb = NULL;
  46 
  47         /*init recv_buf*/
  48         _init_queue(&precvpriv->free_recv_buf_queue);
  49         precvpriv->pallocated_recv_buf =
  50                 kzalloc(NR_RECVBUFF * sizeof(struct recv_buf) + 4, GFP_ATOMIC);
  51         if (!precvpriv->pallocated_recv_buf)
  52                 return;
  53         precvpriv->precv_buf = precvpriv->pallocated_recv_buf + 4 -
  54                               ((addr_t)(precvpriv->pallocated_recv_buf) & 3);
  55         precvbuf = (struct recv_buf *)precvpriv->precv_buf;
  56         for (i = 0; i < NR_RECVBUFF; i++) {
  57                 INIT_LIST_HEAD(&precvbuf->list);
  58                 spin_lock_init(&precvbuf->recvbuf_lock);
  59                 if (r8712_os_recvbuf_resource_alloc(padapter, precvbuf))
  60                         break;
  61                 precvbuf->ref_cnt = 0;
  62                 precvbuf->adapter = padapter;
  63                 list_add_tail(&precvbuf->list,
  64                                  &(precvpriv->free_recv_buf_queue.queue));
  65                 precvbuf++;
  66         }
  67         precvpriv->free_recv_buf_queue_cnt = NR_RECVBUFF;
  68         tasklet_init(&precvpriv->recv_tasklet,
  69              (void(*)(unsigned long))recv_tasklet,
  70              (unsigned long)padapter);
  71         skb_queue_head_init(&precvpriv->rx_skb_queue);
  72 
  73         skb_queue_head_init(&precvpriv->free_recv_skb_queue);
  74         for (i = 0; i < NR_PREALLOC_RECV_SKB; i++) {
  75                 pskb = netdev_alloc_skb(padapter->pnetdev, MAX_RECVBUF_SZ +
  76                        RECVBUFF_ALIGN_SZ);
  77                 if (pskb) {
  78                         tmpaddr = (addr_t)pskb->data;
  79                         alignment = tmpaddr & (RECVBUFF_ALIGN_SZ - 1);
  80                         skb_reserve(pskb, (RECVBUFF_ALIGN_SZ - alignment));
  81                         skb_queue_tail(&precvpriv->free_recv_skb_queue, pskb);
  82                 }
  83                 pskb = NULL;
  84         }
  85 }
  86 
  87 void r8712_free_recv_priv(struct recv_priv *precvpriv)
  88 {
  89         int i;
  90         struct recv_buf *precvbuf;
  91         struct _adapter *padapter = precvpriv->adapter;
  92 
  93         precvbuf = (struct recv_buf *)precvpriv->precv_buf;
  94         for (i = 0; i < NR_RECVBUFF; i++) {
  95                 r8712_os_recvbuf_resource_free(padapter, precvbuf);
  96                 precvbuf++;
  97         }
  98         kfree(precvpriv->pallocated_recv_buf);
  99         skb_queue_purge(&precvpriv->rx_skb_queue);
 100         if (skb_queue_len(&precvpriv->rx_skb_queue))
 101                 netdev_warn(padapter->pnetdev, "r8712u: rx_skb_queue not empty\n");
 102         skb_queue_purge(&precvpriv->free_recv_skb_queue);
 103         if (skb_queue_len(&precvpriv->free_recv_skb_queue))
 104                 netdev_warn(padapter->pnetdev, "r8712u: free_recv_skb_queue not empty %d\n",
 105                             skb_queue_len(&precvpriv->free_recv_skb_queue));
 106 }
 107 
 108 void r8712_init_recvbuf(struct _adapter *padapter, struct recv_buf *precvbuf)
 109 {
 110         precvbuf->transfer_len = 0;
 111         precvbuf->len = 0;
 112         precvbuf->ref_cnt = 0;
 113         if (precvbuf->pbuf) {
 114                 precvbuf->pdata = precvbuf->pbuf;
 115                 precvbuf->phead = precvbuf->pbuf;
 116                 precvbuf->ptail = precvbuf->pbuf;
 117                 precvbuf->pend = precvbuf->pdata + MAX_RECVBUF_SZ;
 118         }
 119 }
 120 
 121 void r8712_free_recvframe(union recv_frame *precvframe,
 122                    struct  __queue *pfree_recv_queue)
 123 {
 124         unsigned long irqL;
 125         struct _adapter *padapter = precvframe->u.hdr.adapter;
 126         struct recv_priv *precvpriv = &padapter->recvpriv;
 127 
 128         if (precvframe->u.hdr.pkt) {
 129                 dev_kfree_skb_any(precvframe->u.hdr.pkt);/*free skb by driver*/
 130                 precvframe->u.hdr.pkt = NULL;
 131         }
 132         spin_lock_irqsave(&pfree_recv_queue->lock, irqL);
 133         list_del_init(&(precvframe->u.hdr.list));
 134         list_add_tail(&(precvframe->u.hdr.list), &pfree_recv_queue->queue);
 135         if (padapter) {
 136                 if (pfree_recv_queue == &precvpriv->free_recv_queue)
 137                         precvpriv->free_recvframe_cnt++;
 138         }
 139         spin_unlock_irqrestore(&pfree_recv_queue->lock, irqL);
 140 }
 141 
 142 static void update_recvframe_attrib_from_recvstat(struct rx_pkt_attrib *pattrib,
 143                                            struct recv_stat *prxstat)
 144 {
 145         u16 drvinfo_sz;
 146 
 147         drvinfo_sz = (le32_to_cpu(prxstat->rxdw0) & 0x000f0000) >> 16;
 148         drvinfo_sz <<= 3;
 149         /*TODO:
 150          * Offset 0
 151          */
 152         pattrib->bdecrypted = ((le32_to_cpu(prxstat->rxdw0) & BIT(27)) >> 27)
 153                                  ? 0 : 1;
 154         pattrib->crc_err = (le32_to_cpu(prxstat->rxdw0) & BIT(14)) >> 14;
 155         /*Offset 4*/
 156         /*Offset 8*/
 157         /*Offset 12*/
 158         if (le32_to_cpu(prxstat->rxdw3) & BIT(13)) {
 159                 pattrib->tcpchk_valid = 1; /* valid */
 160                 if (le32_to_cpu(prxstat->rxdw3) & BIT(11))
 161                         pattrib->tcp_chkrpt = 1; /* correct */
 162                 else
 163                         pattrib->tcp_chkrpt = 0; /* incorrect */
 164                 if (le32_to_cpu(prxstat->rxdw3) & BIT(12))
 165                         pattrib->ip_chkrpt = 1; /* correct */
 166                 else
 167                         pattrib->ip_chkrpt = 0; /* incorrect */
 168         } else {
 169                 pattrib->tcpchk_valid = 0; /* invalid */
 170         }
 171         pattrib->mcs_rate = (u8)((le32_to_cpu(prxstat->rxdw3)) & 0x3f);
 172         pattrib->htc = (u8)((le32_to_cpu(prxstat->rxdw3) >> 14) & 0x1);
 173         /*Offset 16*/
 174         /*Offset 20*/
 175         /*phy_info*/
 176 }
 177 
 178 /*perform defrag*/
 179 static union recv_frame *recvframe_defrag(struct _adapter *adapter,
 180                                    struct  __queue *defrag_q)
 181 {
 182         struct list_head *plist, *phead;
 183         u8 wlanhdr_offset;
 184         u8      curfragnum;
 185         struct recv_frame_hdr *pfhdr, *pnfhdr;
 186         union recv_frame *prframe, *pnextrframe;
 187         struct  __queue *pfree_recv_queue;
 188 
 189         pfree_recv_queue = &adapter->recvpriv.free_recv_queue;
 190         phead = &defrag_q->queue;
 191         plist = phead->next;
 192         prframe = container_of(plist, union recv_frame, u.list);
 193         list_del_init(&prframe->u.list);
 194         pfhdr = &prframe->u.hdr;
 195         curfragnum = 0;
 196         if (curfragnum != pfhdr->attrib.frag_num) {
 197                 /*the first fragment number must be 0
 198                  *free the whole queue
 199                  */
 200                 r8712_free_recvframe(prframe, pfree_recv_queue);
 201                 r8712_free_recvframe_queue(defrag_q, pfree_recv_queue);
 202                 return NULL;
 203         }
 204         curfragnum++;
 205         plist = &defrag_q->queue;
 206         plist = plist->next;
 207         while (!end_of_queue_search(phead, plist)) {
 208                 pnextrframe = container_of(plist, union recv_frame, u.list);
 209                 pnfhdr = &pnextrframe->u.hdr;
 210                 /*check the fragment sequence  (2nd ~n fragment frame) */
 211                 if (curfragnum != pnfhdr->attrib.frag_num) {
 212                         /* the fragment number must increase  (after decache)
 213                          * release the defrag_q & prframe
 214                          */
 215                         r8712_free_recvframe(prframe, pfree_recv_queue);
 216                         r8712_free_recvframe_queue(defrag_q, pfree_recv_queue);
 217                         return NULL;
 218                 }
 219                 curfragnum++;
 220                 /* copy the 2nd~n fragment frame's payload to the first fragment
 221                  * get the 2nd~last fragment frame's payload
 222                  */
 223                 wlanhdr_offset = pnfhdr->attrib.hdrlen + pnfhdr->attrib.iv_len;
 224                 recvframe_pull(pnextrframe, wlanhdr_offset);
 225                 /* append  to first fragment frame's tail (if privacy frame,
 226                  * pull the ICV)
 227                  */
 228                 recvframe_pull_tail(prframe, pfhdr->attrib.icv_len);
 229                 memcpy(pfhdr->rx_tail, pnfhdr->rx_data, pnfhdr->len);
 230                 recvframe_put(prframe, pnfhdr->len);
 231                 pfhdr->attrib.icv_len = pnfhdr->attrib.icv_len;
 232                 plist = plist->next;
 233         }
 234         /* free the defrag_q queue and return the prframe */
 235         r8712_free_recvframe_queue(defrag_q, pfree_recv_queue);
 236         return prframe;
 237 }
 238 
 239 /* check if need to defrag, if needed queue the frame to defrag_q */
 240 union recv_frame *r8712_recvframe_chk_defrag(struct _adapter *padapter,
 241                                              union recv_frame *precv_frame)
 242 {
 243         u8      ismfrag;
 244         u8      fragnum;
 245         u8   *psta_addr;
 246         struct recv_frame_hdr *pfhdr;
 247         struct sta_info *psta;
 248         struct  sta_priv *pstapriv;
 249         struct list_head *phead;
 250         union recv_frame *prtnframe = NULL;
 251         struct  __queue *pfree_recv_queue, *pdefrag_q;
 252 
 253         pstapriv = &padapter->stapriv;
 254         pfhdr = &precv_frame->u.hdr;
 255         pfree_recv_queue = &padapter->recvpriv.free_recv_queue;
 256         /* need to define struct of wlan header frame ctrl */
 257         ismfrag = pfhdr->attrib.mfrag;
 258         fragnum = pfhdr->attrib.frag_num;
 259         psta_addr = pfhdr->attrib.ta;
 260         psta = r8712_get_stainfo(pstapriv, psta_addr);
 261         if (!psta)
 262                 pdefrag_q = NULL;
 263         else
 264                 pdefrag_q = &psta->sta_recvpriv.defrag_q;
 265 
 266         if ((ismfrag == 0) && (fragnum == 0))
 267                 prtnframe = precv_frame;/*isn't a fragment frame*/
 268         if (ismfrag == 1) {
 269                 /* 0~(n-1) fragment frame
 270                  * enqueue to defraf_g
 271                  */
 272                 if (pdefrag_q) {
 273                         if (fragnum == 0) {
 274                                 /*the first fragment*/
 275                                 if (!list_empty(&pdefrag_q->queue)) {
 276                                         /*free current defrag_q */
 277                                         r8712_free_recvframe_queue(pdefrag_q,
 278                                                              pfree_recv_queue);
 279                                 }
 280                         }
 281                         /* Then enqueue the 0~(n-1) fragment to the defrag_q */
 282                         phead = &pdefrag_q->queue;
 283                         list_add_tail(&pfhdr->list, phead);
 284                         prtnframe = NULL;
 285                 } else {
 286                         /* can't find this ta's defrag_queue, so free this
 287                          * recv_frame
 288                          */
 289                         r8712_free_recvframe(precv_frame, pfree_recv_queue);
 290                         prtnframe = NULL;
 291                 }
 292 
 293         }
 294         if ((ismfrag == 0) && (fragnum != 0)) {
 295                 /* the last fragment frame
 296                  * enqueue the last fragment
 297                  */
 298                 if (pdefrag_q) {
 299                         phead = &pdefrag_q->queue;
 300                         list_add_tail(&pfhdr->list, phead);
 301                         /*call recvframe_defrag to defrag*/
 302                         precv_frame = recvframe_defrag(padapter, pdefrag_q);
 303                         prtnframe = precv_frame;
 304                 } else {
 305                         /* can't find this ta's defrag_queue, so free this
 306                          *  recv_frame
 307                          */
 308                         r8712_free_recvframe(precv_frame, pfree_recv_queue);
 309                         prtnframe = NULL;
 310                 }
 311         }
 312         if (prtnframe && (prtnframe->u.hdr.attrib.privacy)) {
 313                 /* after defrag we must check tkip mic code */
 314                 if (r8712_recvframe_chkmic(padapter, prtnframe) == _FAIL) {
 315                         r8712_free_recvframe(prtnframe, pfree_recv_queue);
 316                         prtnframe = NULL;
 317                 }
 318         }
 319         return prtnframe;
 320 }
 321 
 322 static void amsdu_to_msdu(struct _adapter *padapter, union recv_frame *prframe)
 323 {
 324         int     a_len, padding_len;
 325         u16     eth_type, nSubframe_Length;
 326         u8      nr_subframes, i;
 327         unsigned char *pdata;
 328         struct rx_pkt_attrib *pattrib;
 329         _pkt *sub_skb, *subframes[MAX_SUBFRAME_COUNT];
 330         struct recv_priv *precvpriv = &padapter->recvpriv;
 331         struct  __queue *pfree_recv_queue = &(precvpriv->free_recv_queue);
 332 
 333         nr_subframes = 0;
 334         pattrib = &prframe->u.hdr.attrib;
 335         recvframe_pull(prframe, prframe->u.hdr.attrib.hdrlen);
 336         if (prframe->u.hdr.attrib.iv_len > 0)
 337                 recvframe_pull(prframe, prframe->u.hdr.attrib.iv_len);
 338         a_len = prframe->u.hdr.len;
 339         pdata = prframe->u.hdr.rx_data;
 340         while (a_len > ETH_HLEN) {
 341                 /* Offset 12 denote 2 mac address */
 342                 nSubframe_Length = *((u16 *)(pdata + 12));
 343                 /*==m==>change the length order*/
 344                 nSubframe_Length = (nSubframe_Length >> 8) +
 345                                    (nSubframe_Length << 8);
 346                 if (a_len < (ETHERNET_HEADER_SIZE + nSubframe_Length)) {
 347                         netdev_warn(padapter->pnetdev, "r8712u: nRemain_Length is %d and nSubframe_Length is: %d\n",
 348                                     a_len, nSubframe_Length);
 349                         goto exit;
 350                 }
 351                 /* move the data point to data content */
 352                 pdata += ETH_HLEN;
 353                 a_len -= ETH_HLEN;
 354                 /* Allocate new skb for releasing to upper layer */
 355                 sub_skb = dev_alloc_skb(nSubframe_Length + 12);
 356                 if (!sub_skb)
 357                         break;
 358                 skb_reserve(sub_skb, 12);
 359                 skb_put_data(sub_skb, pdata, nSubframe_Length);
 360                 subframes[nr_subframes++] = sub_skb;
 361                 if (nr_subframes >= MAX_SUBFRAME_COUNT) {
 362                         netdev_warn(padapter->pnetdev, "r8712u: ParseSubframe(): Too many Subframes! Packets dropped!\n");
 363                         break;
 364                 }
 365                 pdata += nSubframe_Length;
 366                 a_len -= nSubframe_Length;
 367                 if (a_len != 0) {
 368                         padding_len = 4 - ((nSubframe_Length + ETH_HLEN) & 3);
 369                         if (padding_len == 4)
 370                                 padding_len = 0;
 371                         if (a_len < padding_len)
 372                                 goto exit;
 373                         pdata += padding_len;
 374                         a_len -= padding_len;
 375                 }
 376         }
 377         for (i = 0; i < nr_subframes; i++) {
 378                 sub_skb = subframes[i];
 379                 /* convert hdr + possible LLC headers into Ethernet header */
 380                 eth_type = (sub_skb->data[6] << 8) | sub_skb->data[7];
 381                 if (sub_skb->len >= 8 &&
 382                    ((!memcmp(sub_skb->data, rfc1042_header, SNAP_SIZE) &&
 383                    eth_type != ETH_P_AARP && eth_type != ETH_P_IPX) ||
 384                    !memcmp(sub_skb->data, bridge_tunnel_header, SNAP_SIZE))) {
 385                         /* remove RFC1042 or Bridge-Tunnel encapsulation and
 386                          * replace EtherType
 387                          */
 388                         skb_pull(sub_skb, SNAP_SIZE);
 389                         memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->src,
 390                                 ETH_ALEN);
 391                         memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->dst,
 392                                 ETH_ALEN);
 393                 } else {
 394                         __be16 len;
 395                         /* Leave Ethernet header part of hdr and full payload */
 396                         len = htons(sub_skb->len);
 397                         memcpy(skb_push(sub_skb, 2), &len, 2);
 398                         memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->src,
 399                                 ETH_ALEN);
 400                         memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->dst,
 401                                 ETH_ALEN);
 402                 }
 403                 /* Indicate the packets to upper layer */
 404                 if (sub_skb) {
 405                         sub_skb->protocol =
 406                                  eth_type_trans(sub_skb, padapter->pnetdev);
 407                         sub_skb->dev = padapter->pnetdev;
 408                         if ((pattrib->tcpchk_valid == 1) &&
 409                             (pattrib->tcp_chkrpt == 1)) {
 410                                 sub_skb->ip_summed = CHECKSUM_UNNECESSARY;
 411                         } else {
 412                                 sub_skb->ip_summed = CHECKSUM_NONE;
 413                         }
 414                         netif_rx(sub_skb);
 415                 }
 416         }
 417 exit:
 418         prframe->u.hdr.len = 0;
 419         r8712_free_recvframe(prframe, pfree_recv_queue);
 420 }
 421 
 422 void r8712_rxcmd_event_hdl(struct _adapter *padapter, void *prxcmdbuf)
 423 {
 424         __le32 voffset;
 425         u8 *poffset;
 426         u16 cmd_len, drvinfo_sz;
 427         struct recv_stat *prxstat;
 428 
 429         poffset = prxcmdbuf;
 430         voffset = *(__le32 *)poffset;
 431         prxstat = prxcmdbuf;
 432         drvinfo_sz = (le32_to_cpu(prxstat->rxdw0) & 0x000f0000) >> 16;
 433         drvinfo_sz <<= 3;
 434         poffset += RXDESC_SIZE + drvinfo_sz;
 435         do {
 436                 voffset  = *(__le32 *)poffset;
 437                 cmd_len = (u16)(le32_to_cpu(voffset) & 0xffff);
 438                 r8712_event_handle(padapter, (__le32 *)poffset);
 439                 poffset += (cmd_len + 8);/*8 bytes alignment*/
 440         } while (le32_to_cpu(voffset) & BIT(31));
 441 
 442 }
 443 
 444 static int check_indicate_seq(struct recv_reorder_ctrl *preorder_ctrl,
 445                               u16 seq_num)
 446 {
 447         u8 wsize = preorder_ctrl->wsize_b;
 448         u16 wend = (preorder_ctrl->indicate_seq + wsize - 1) % 4096;
 449 
 450         /* Rx Reorder initialize condition.*/
 451         if (preorder_ctrl->indicate_seq == 0xffff)
 452                 preorder_ctrl->indicate_seq = seq_num;
 453         /* Drop out the packet which SeqNum is smaller than WinStart */
 454         if (SN_LESS(seq_num, preorder_ctrl->indicate_seq))
 455                 return false;
 456         /*
 457          * Sliding window manipulation. Conditions includes:
 458          * 1. Incoming SeqNum is equal to WinStart =>Window shift 1
 459          * 2. Incoming SeqNum is larger than the WinEnd => Window shift N
 460          */
 461         if (SN_EQUAL(seq_num, preorder_ctrl->indicate_seq))
 462                 preorder_ctrl->indicate_seq = (preorder_ctrl->indicate_seq +
 463                                               1) % 4096;
 464         else if (SN_LESS(wend, seq_num)) {
 465                 if (seq_num >= (wsize - 1))
 466                         preorder_ctrl->indicate_seq = seq_num + 1 - wsize;
 467                 else
 468                         preorder_ctrl->indicate_seq = 4095 - (wsize -
 469                                                       (seq_num + 1)) + 1;
 470         }
 471         return true;
 472 }
 473 
 474 static int enqueue_reorder_recvframe(struct recv_reorder_ctrl *preorder_ctrl,
 475                               union recv_frame *prframe)
 476 {
 477         struct list_head *phead, *plist;
 478         union recv_frame *pnextrframe;
 479         struct rx_pkt_attrib *pnextattrib;
 480         struct  __queue *ppending_recvframe_queue =
 481                                         &preorder_ctrl->pending_recvframe_queue;
 482         struct rx_pkt_attrib *pattrib = &prframe->u.hdr.attrib;
 483 
 484         phead = &ppending_recvframe_queue->queue;
 485         plist = phead->next;
 486         while (!end_of_queue_search(phead, plist)) {
 487                 pnextrframe = container_of(plist, union recv_frame, u.list);
 488                 pnextattrib = &pnextrframe->u.hdr.attrib;
 489                 if (SN_LESS(pnextattrib->seq_num, pattrib->seq_num))
 490                         plist = plist->next;
 491                 else if (SN_EQUAL(pnextattrib->seq_num, pattrib->seq_num))
 492                         return false;
 493                 else
 494                         break;
 495         }
 496         list_del_init(&(prframe->u.hdr.list));
 497         list_add_tail(&(prframe->u.hdr.list), plist);
 498         return true;
 499 }
 500 
 501 int r8712_recv_indicatepkts_in_order(struct _adapter *padapter,
 502                                struct recv_reorder_ctrl *preorder_ctrl,
 503                                int bforced)
 504 {
 505         struct list_head *phead, *plist;
 506         union recv_frame *prframe;
 507         struct rx_pkt_attrib *pattrib;
 508         int bPktInBuf = false;
 509         struct  __queue *ppending_recvframe_queue =
 510                          &preorder_ctrl->pending_recvframe_queue;
 511 
 512         phead = &ppending_recvframe_queue->queue;
 513         plist = phead->next;
 514         /* Handling some condition for forced indicate case.*/
 515         if (bforced) {
 516                 if (list_empty(phead))
 517                         return true;
 518 
 519                 prframe = container_of(plist, union recv_frame, u.list);
 520                 pattrib = &prframe->u.hdr.attrib;
 521                 preorder_ctrl->indicate_seq = pattrib->seq_num;
 522         }
 523         /* Prepare indication list and indication.
 524          * Check if there is any packet need indicate.
 525          */
 526         while (!list_empty(phead)) {
 527                 prframe = container_of(plist, union recv_frame, u.list);
 528                 pattrib = &prframe->u.hdr.attrib;
 529                 if (!SN_LESS(preorder_ctrl->indicate_seq, pattrib->seq_num)) {
 530                         plist = plist->next;
 531                         list_del_init(&(prframe->u.hdr.list));
 532                         if (SN_EQUAL(preorder_ctrl->indicate_seq,
 533                             pattrib->seq_num))
 534                                 preorder_ctrl->indicate_seq =
 535                                   (preorder_ctrl->indicate_seq + 1) % 4096;
 536                         /*indicate this recv_frame*/
 537                         if (!pattrib->amsdu) {
 538                                 if (!padapter->driver_stopped &&
 539                                     !padapter->surprise_removed) {
 540                                         /* indicate this recv_frame */
 541                                         r8712_recv_indicatepkt(padapter,
 542                                                                prframe);
 543                                 }
 544                         } else if (pattrib->amsdu == 1) {
 545                                 amsdu_to_msdu(padapter, prframe);
 546                         }
 547                         /* Update local variables. */
 548                         bPktInBuf = false;
 549                 } else {
 550                         bPktInBuf = true;
 551                         break;
 552                 }
 553         }
 554         return bPktInBuf;
 555 }
 556 
 557 static int recv_indicatepkt_reorder(struct _adapter *padapter,
 558                              union recv_frame *prframe)
 559 {
 560         unsigned long irql;
 561         struct rx_pkt_attrib *pattrib = &prframe->u.hdr.attrib;
 562         struct recv_reorder_ctrl *preorder_ctrl = prframe->u.hdr.preorder_ctrl;
 563         struct  __queue *ppending_recvframe_queue =
 564                          &preorder_ctrl->pending_recvframe_queue;
 565 
 566         if (!pattrib->amsdu) {
 567                 /* s1. */
 568                 r8712_wlanhdr_to_ethhdr(prframe);
 569                 if (pattrib->qos != 1) {
 570                         if (!padapter->driver_stopped &&
 571                             !padapter->surprise_removed) {
 572                                 r8712_recv_indicatepkt(padapter, prframe);
 573                                 return 0;
 574                         } else {
 575                                 return -EINVAL;
 576                         }
 577                 }
 578         }
 579         spin_lock_irqsave(&ppending_recvframe_queue->lock, irql);
 580         /*s2. check if winstart_b(indicate_seq) needs to be updated*/
 581         if (!check_indicate_seq(preorder_ctrl, pattrib->seq_num))
 582                 goto _err_exit;
 583         /*s3. Insert all packet into Reorder Queue to maintain its ordering.*/
 584         if (!enqueue_reorder_recvframe(preorder_ctrl, prframe))
 585                 goto _err_exit;
 586         /*s4.
 587          * Indication process.
 588          * After Packet dropping and Sliding Window shifting as above, we can
 589          * now just indicate the packets with the SeqNum smaller than latest
 590          * WinStart and buffer other packets.
 591          *
 592          * For Rx Reorder condition:
 593          * 1. All packets with SeqNum smaller than WinStart => Indicate
 594          * 2. All packets with SeqNum larger than or equal to
 595          * WinStart => Buffer it.
 596          */
 597         if (r8712_recv_indicatepkts_in_order(padapter, preorder_ctrl, false)) {
 598                 mod_timer(&preorder_ctrl->reordering_ctrl_timer,
 599                           jiffies + msecs_to_jiffies(REORDER_WAIT_TIME));
 600                 spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
 601         } else {
 602                 spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
 603                 del_timer(&preorder_ctrl->reordering_ctrl_timer);
 604         }
 605         return 0;
 606 _err_exit:
 607         spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
 608         return -ENOMEM;
 609 }
 610 
 611 void r8712_reordering_ctrl_timeout_handler(void *pcontext)
 612 {
 613         unsigned long irql;
 614         struct recv_reorder_ctrl *preorder_ctrl = pcontext;
 615         struct _adapter *padapter = preorder_ctrl->padapter;
 616         struct  __queue *ppending_recvframe_queue =
 617                                  &preorder_ctrl->pending_recvframe_queue;
 618 
 619         if (padapter->driver_stopped || padapter->surprise_removed)
 620                 return;
 621         spin_lock_irqsave(&ppending_recvframe_queue->lock, irql);
 622         r8712_recv_indicatepkts_in_order(padapter, preorder_ctrl, true);
 623         spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
 624 }
 625 
 626 static int r8712_process_recv_indicatepkts(struct _adapter *padapter,
 627                               union recv_frame *prframe)
 628 {
 629         int retval = _SUCCESS;
 630         struct mlme_priv *pmlmepriv = &padapter->mlmepriv;
 631         struct ht_priv  *phtpriv = &pmlmepriv->htpriv;
 632 
 633         if (phtpriv->ht_option == 1) { /*B/G/N Mode*/
 634                 if (recv_indicatepkt_reorder(padapter, prframe)) {
 635                         /* including perform A-MPDU Rx Ordering Buffer Control*/
 636                         if (!padapter->driver_stopped &&
 637                             !padapter->surprise_removed)
 638                                 return _FAIL;
 639                 }
 640         } else { /*B/G mode*/
 641                 retval = r8712_wlanhdr_to_ethhdr(prframe);
 642                 if (retval)
 643                         return _FAIL;
 644                 if (!padapter->driver_stopped && !padapter->surprise_removed) {
 645                         /* indicate this recv_frame */
 646                         r8712_recv_indicatepkt(padapter, prframe);
 647                 } else {
 648                         return _FAIL;
 649                 }
 650         }
 651         return retval;
 652 }
 653 
 654 static u8 query_rx_pwr_percentage(s8 antpower)
 655 {
 656         if ((antpower <= -100) || (antpower >= 20))
 657                 return  0;
 658         else if (antpower >= 0)
 659                 return  100;
 660         else
 661                 return 100 + antpower;
 662 }
 663 
 664 static u8 evm_db2percentage(s8 value)
 665 {
 666         /*
 667          * -33dB~0dB to 0%~99%
 668          */
 669         s8 ret_val;
 670 
 671         ret_val = value;
 672         if (ret_val >= 0)
 673                 ret_val = 0;
 674         if (ret_val <= -33)
 675                 ret_val = -33;
 676         ret_val = -ret_val;
 677         ret_val *= 3;
 678         if (ret_val == 99)
 679                 ret_val = 100;
 680         return ret_val;
 681 }
 682 
 683 s32 r8712_signal_scale_mapping(s32 cur_sig)
 684 {
 685         s32 ret_sig;
 686 
 687         if (cur_sig >= 51 && cur_sig <= 100)
 688                 ret_sig = 100;
 689         else if (cur_sig >= 41 && cur_sig <= 50)
 690                 ret_sig = 80 + ((cur_sig - 40) * 2);
 691         else if (cur_sig >= 31 && cur_sig <= 40)
 692                 ret_sig = 66 + (cur_sig - 30);
 693         else if (cur_sig >= 21 && cur_sig <= 30)
 694                 ret_sig = 54 + (cur_sig - 20);
 695         else if (cur_sig >= 10 && cur_sig <= 20)
 696                 ret_sig = 42 + (((cur_sig - 10) * 2) / 3);
 697         else if (cur_sig >= 5 && cur_sig <= 9)
 698                 ret_sig = 22 + (((cur_sig - 5) * 3) / 2);
 699         else if (cur_sig >= 1 && cur_sig <= 4)
 700                 ret_sig = 6 + (((cur_sig - 1) * 3) / 2);
 701         else
 702                 ret_sig = cur_sig;
 703         return ret_sig;
 704 }
 705 
 706 static s32  translate2dbm(struct _adapter *padapter, u8 signal_strength_idx)
 707 {
 708         s32 signal_power; /* in dBm.*/
 709         /* Translate to dBm (x=0.5y-95).*/
 710         signal_power = (s32)((signal_strength_idx + 1) >> 1);
 711         signal_power -= 95;
 712         return signal_power;
 713 }
 714 
 715 static void query_rx_phy_status(struct _adapter *padapter,
 716                                 union recv_frame *prframe)
 717 {
 718         u8 i, max_spatial_stream, evm;
 719         struct recv_stat *prxstat = (struct recv_stat *)prframe->u.hdr.rx_head;
 720         struct phy_stat *pphy_stat = (struct phy_stat *)(prxstat + 1);
 721         u8 *pphy_head = (u8 *)(prxstat + 1);
 722         s8 rx_pwr[4], rx_pwr_all;
 723         u8 pwdb_all;
 724         u32 rssi, total_rssi = 0;
 725         u8 bcck_rate = 0, rf_rx_num = 0, cck_highpwr = 0;
 726         struct phy_cck_rx_status *pcck_buf;
 727         u8 sq;
 728 
 729         /* Record it for next packet processing*/
 730         bcck_rate = (prframe->u.hdr.attrib.mcs_rate <= 3 ? 1 : 0);
 731         if (bcck_rate) {
 732                 u8 report;
 733 
 734                 /* CCK Driver info Structure is not the same as OFDM packet.*/
 735                 pcck_buf = (struct phy_cck_rx_status *)pphy_stat;
 736                 /* (1)Hardware does not provide RSSI for CCK
 737                  * (2)PWDB, Average PWDB calculated by hardware
 738                  * (for rate adaptive)
 739                  */
 740                 if (!cck_highpwr) {
 741                         report = pcck_buf->cck_agc_rpt & 0xc0;
 742                         report >>= 6;
 743                         switch (report) {
 744                         /* Modify the RF RNA gain value to -40, -20,
 745                          * -2, 14 by Jenyu's suggestion
 746                          * Note: different RF with the different
 747                          * RNA gain.
 748                          */
 749                         case 0x3:
 750                                 rx_pwr_all = -40 - (pcck_buf->cck_agc_rpt &
 751                                              0x3e);
 752                                 break;
 753                         case 0x2:
 754                                 rx_pwr_all = -20 - (pcck_buf->cck_agc_rpt &
 755                                              0x3e);
 756                                 break;
 757                         case 0x1:
 758                                 rx_pwr_all = -2 - (pcck_buf->cck_agc_rpt &
 759                                              0x3e);
 760                                 break;
 761                         case 0x0:
 762                                 rx_pwr_all = 14 - (pcck_buf->cck_agc_rpt &
 763                                              0x3e);
 764                                 break;
 765                         }
 766                 } else {
 767                         report = ((u8)(le32_to_cpu(pphy_stat->phydw1) >> 8)) &
 768                                  0x60;
 769                         report >>= 5;
 770                         switch (report) {
 771                         case 0x3:
 772                                 rx_pwr_all = -40 - ((pcck_buf->cck_agc_rpt &
 773                                              0x1f) << 1);
 774                                 break;
 775                         case 0x2:
 776                                 rx_pwr_all = -20 - ((pcck_buf->cck_agc_rpt &
 777                                              0x1f) << 1);
 778                                 break;
 779                         case 0x1:
 780                                 rx_pwr_all = -2 - ((pcck_buf->cck_agc_rpt &
 781                                              0x1f) << 1);
 782                                 break;
 783                         case 0x0:
 784                                 rx_pwr_all = 14 - ((pcck_buf->cck_agc_rpt &
 785                                              0x1f) << 1);
 786                                 break;
 787                         }
 788                 }
 789                 pwdb_all = query_rx_pwr_percentage(rx_pwr_all);
 790                 /* CCK gain is smaller than OFDM/MCS gain,*/
 791                 /* so we add gain diff by experiences, the val is 6 */
 792                 pwdb_all += 6;
 793                 if (pwdb_all > 100)
 794                         pwdb_all = 100;
 795                 /* modify the offset to make the same gain index with OFDM.*/
 796                 if (pwdb_all > 34 && pwdb_all <= 42)
 797                         pwdb_all -= 2;
 798                 else if (pwdb_all > 26 && pwdb_all <= 34)
 799                         pwdb_all -= 6;
 800                 else if (pwdb_all > 14 && pwdb_all <= 26)
 801                         pwdb_all -= 8;
 802                 else if (pwdb_all > 4 && pwdb_all <= 14)
 803                         pwdb_all -= 4;
 804                 /*
 805                  * (3) Get Signal Quality (EVM)
 806                  */
 807                 if (pwdb_all > 40) {
 808                         sq = 100;
 809                 } else {
 810                         sq = pcck_buf->sq_rpt;
 811                         if (pcck_buf->sq_rpt > 64)
 812                                 sq = 0;
 813                         else if (pcck_buf->sq_rpt < 20)
 814                                 sq = 100;
 815                         else
 816                                 sq = ((64 - sq) * 100) / 44;
 817                 }
 818                 prframe->u.hdr.attrib.signal_qual = sq;
 819                 prframe->u.hdr.attrib.rx_mimo_signal_qual[0] = sq;
 820                 prframe->u.hdr.attrib.rx_mimo_signal_qual[1] = -1;
 821         } else {
 822                 /* (1)Get RSSI for HT rate */
 823                 for (i = 0; i < ((padapter->registrypriv.rf_config) &
 824                             0x0f); i++) {
 825                         rf_rx_num++;
 826                         rx_pwr[i] = ((pphy_head[PHY_STAT_GAIN_TRSW_SHT + i]
 827                                     & 0x3F) * 2) - 110;
 828                         /* Translate DBM to percentage. */
 829                         rssi = query_rx_pwr_percentage(rx_pwr[i]);
 830                         total_rssi += rssi;
 831                 }
 832                 /* (2)PWDB, Average PWDB calculated by hardware (for
 833                  * rate adaptive)
 834                  */
 835                 rx_pwr_all = (((pphy_head[PHY_STAT_PWDB_ALL_SHT]) >> 1) & 0x7f)
 836                              - 106;
 837                 pwdb_all = query_rx_pwr_percentage(rx_pwr_all);
 838 
 839                 {
 840                         /* (3)EVM of HT rate */
 841                         if (prframe->u.hdr.attrib.htc &&
 842                             prframe->u.hdr.attrib.mcs_rate >= 20 &&
 843                             prframe->u.hdr.attrib.mcs_rate <= 27) {
 844                                 /* both spatial stream make sense */
 845                                 max_spatial_stream = 2;
 846                         } else {
 847                                 /* only spatial stream 1 makes sense */
 848                                 max_spatial_stream = 1;
 849                         }
 850                         for (i = 0; i < max_spatial_stream; i++) {
 851                                 evm = evm_db2percentage((pphy_head
 852                                       [PHY_STAT_RXEVM_SHT + i]));/*dbm*/
 853                                 prframe->u.hdr.attrib.signal_qual =
 854                                          (u8)(evm & 0xff);
 855                                 prframe->u.hdr.attrib.rx_mimo_signal_qual[i] =
 856                                          (u8)(evm & 0xff);
 857                         }
 858                 }
 859         }
 860         /* UI BSS List signal strength(in percentage), make it good looking,
 861          * from 0~100. It is assigned to the BSS List in
 862          * GetValueFromBeaconOrProbeRsp().
 863          */
 864         if (bcck_rate) {
 865                 prframe->u.hdr.attrib.signal_strength =
 866                          (u8)r8712_signal_scale_mapping(pwdb_all);
 867         } else {
 868                 if (rf_rx_num != 0)
 869                         prframe->u.hdr.attrib.signal_strength =
 870                                  (u8)(r8712_signal_scale_mapping(total_rssi /=
 871                                  rf_rx_num));
 872         }
 873 }
 874 
 875 static void process_link_qual(struct _adapter *padapter,
 876                               union recv_frame *prframe)
 877 {
 878         u32     last_evm = 0, tmpVal;
 879         struct rx_pkt_attrib *pattrib;
 880         struct smooth_rssi_data *sqd = &padapter->recvpriv.signal_qual_data;
 881 
 882         if (!prframe || !padapter)
 883                 return;
 884         pattrib = &prframe->u.hdr.attrib;
 885         if (pattrib->signal_qual != 0) {
 886                 /*
 887                  * 1. Record the general EVM to the sliding window.
 888                  */
 889                 if (sqd->total_num++ >= PHY_LINKQUALITY_SLID_WIN_MAX) {
 890                         sqd->total_num = PHY_LINKQUALITY_SLID_WIN_MAX;
 891                         last_evm = sqd->elements[sqd->index];
 892                         sqd->total_val -= last_evm;
 893                 }
 894                 sqd->total_val += pattrib->signal_qual;
 895                 sqd->elements[sqd->index++] = pattrib->signal_qual;
 896                 if (sqd->index >= PHY_LINKQUALITY_SLID_WIN_MAX)
 897                         sqd->index = 0;
 898 
 899                 /* <1> Showed on UI for user, in percentage. */
 900                 tmpVal = sqd->total_val / sqd->total_num;
 901                 padapter->recvpriv.signal = (u8)tmpVal;
 902         }
 903 }
 904 
 905 static void process_rssi(struct _adapter *padapter, union recv_frame *prframe)
 906 {
 907         u32 last_rssi, tmp_val;
 908         struct rx_pkt_attrib *pattrib = &prframe->u.hdr.attrib;
 909         struct smooth_rssi_data *ssd = &padapter->recvpriv.signal_strength_data;
 910 
 911         if (ssd->total_num++ >= PHY_RSSI_SLID_WIN_MAX) {
 912                 ssd->total_num = PHY_RSSI_SLID_WIN_MAX;
 913                 last_rssi = ssd->elements[ssd->index];
 914                 ssd->total_val -= last_rssi;
 915         }
 916         ssd->total_val += pattrib->signal_strength;
 917         ssd->elements[ssd->index++] = pattrib->signal_strength;
 918         if (ssd->index >= PHY_RSSI_SLID_WIN_MAX)
 919                 ssd->index = 0;
 920         tmp_val = ssd->total_val / ssd->total_num;
 921         padapter->recvpriv.rssi = (s8)translate2dbm(padapter, (u8)tmp_val);
 922 }
 923 
 924 static void process_phy_info(struct _adapter *padapter,
 925                              union recv_frame *prframe)
 926 {
 927         query_rx_phy_status(padapter, prframe);
 928         process_rssi(padapter, prframe);
 929         process_link_qual(padapter,  prframe);
 930 }
 931 
 932 int recv_func(struct _adapter *padapter, void *pcontext)
 933 {
 934         struct rx_pkt_attrib *pattrib;
 935         union recv_frame *prframe, *orig_prframe;
 936         int retval = _SUCCESS;
 937         struct  __queue *pfree_recv_queue = &padapter->recvpriv.free_recv_queue;
 938         struct  mlme_priv       *pmlmepriv = &padapter->mlmepriv;
 939 
 940         prframe = pcontext;
 941         orig_prframe = prframe;
 942         pattrib = &prframe->u.hdr.attrib;
 943         if (check_fwstate(pmlmepriv, WIFI_MP_STATE)) {
 944                 if (pattrib->crc_err == 1)
 945                         padapter->mppriv.rx_crcerrpktcount++;
 946                 else
 947                         padapter->mppriv.rx_pktcount++;
 948                 if (!check_fwstate(pmlmepriv, WIFI_MP_LPBK_STATE)) {
 949                         /* free this recv_frame */
 950                         r8712_free_recvframe(orig_prframe, pfree_recv_queue);
 951                         goto _exit_recv_func;
 952                 }
 953         }
 954         /* check the frame crtl field and decache */
 955         retval = r8712_validate_recv_frame(padapter, prframe);
 956         if (retval != _SUCCESS) {
 957                 /* free this recv_frame */
 958                 r8712_free_recvframe(orig_prframe, pfree_recv_queue);
 959                 goto _exit_recv_func;
 960         }
 961         process_phy_info(padapter, prframe);
 962         prframe = r8712_decryptor(padapter, prframe);
 963         if (!prframe) {
 964                 retval = _FAIL;
 965                 goto _exit_recv_func;
 966         }
 967         prframe = r8712_recvframe_chk_defrag(padapter, prframe);
 968         if (!prframe)
 969                 goto _exit_recv_func;
 970         prframe = r8712_portctrl(padapter, prframe);
 971         if (!prframe) {
 972                 retval = _FAIL;
 973                 goto _exit_recv_func;
 974         }
 975         retval = r8712_process_recv_indicatepkts(padapter, prframe);
 976         if (retval != _SUCCESS) {
 977                 r8712_free_recvframe(orig_prframe, pfree_recv_queue);
 978                 goto _exit_recv_func;
 979         }
 980 _exit_recv_func:
 981         return retval;
 982 }
 983 
 984 static void recvbuf2recvframe(struct _adapter *padapter, struct sk_buff *pskb)
 985 {
 986         u8 *pbuf, shift_sz = 0;
 987         u8      frag, mf;
 988         uint    pkt_len;
 989         u32 transfer_len;
 990         struct recv_stat *prxstat;
 991         u16     pkt_cnt, drvinfo_sz, pkt_offset, tmp_len, alloc_sz;
 992         struct  __queue *pfree_recv_queue;
 993         _pkt  *pkt_copy = NULL;
 994         union recv_frame *precvframe = NULL;
 995         struct recv_priv *precvpriv = &padapter->recvpriv;
 996 
 997         pfree_recv_queue = &(precvpriv->free_recv_queue);
 998         pbuf = pskb->data;
 999         prxstat = (struct recv_stat *)pbuf;
1000         pkt_cnt = (le32_to_cpu(prxstat->rxdw2) >> 16) & 0xff;
1001         pkt_len =  le32_to_cpu(prxstat->rxdw0) & 0x00003fff;
1002         transfer_len = pskb->len;
1003         /* Test throughput with Netgear 3700 (No security) with Chariot 3T3R
1004          * pairs. The packet count will be a big number so that the containing
1005          * packet will effect the Rx reordering.
1006          */
1007         if (transfer_len < pkt_len) {
1008                 /* In this case, it means the MAX_RECVBUF_SZ is too small to
1009                  * get the data from 8712u.
1010                  */
1011                 return;
1012         }
1013         do {
1014                 prxstat = (struct recv_stat *)pbuf;
1015                 pkt_len =  le32_to_cpu(prxstat->rxdw0) & 0x00003fff;
1016                 /* more fragment bit */
1017                 mf = (le32_to_cpu(prxstat->rxdw1) >> 27) & 0x1;
1018                 /* ragmentation number */
1019                 frag = (le32_to_cpu(prxstat->rxdw2) >> 12) & 0xf;
1020                 /* uint 2^3 = 8 bytes */
1021                 drvinfo_sz = (le32_to_cpu(prxstat->rxdw0) & 0x000f0000) >> 16;
1022                 drvinfo_sz <<= 3;
1023                 if (pkt_len <= 0)
1024                         return;
1025                 /* Qos data, wireless lan header length is 26 */
1026                 if ((le32_to_cpu(prxstat->rxdw0) >> 23) & 0x01)
1027                         shift_sz = 2;
1028                 precvframe = r8712_alloc_recvframe(pfree_recv_queue);
1029                 if (!precvframe)
1030                         return;
1031                 INIT_LIST_HEAD(&precvframe->u.hdr.list);
1032                 precvframe->u.hdr.precvbuf = NULL; /*can't access the precvbuf*/
1033                 precvframe->u.hdr.len = 0;
1034                 tmp_len = pkt_len + drvinfo_sz + RXDESC_SIZE;
1035                 pkt_offset = (u16)round_up(tmp_len, 128);
1036                 /* for first fragment packet, driver need allocate 1536 +
1037                  * drvinfo_sz + RXDESC_SIZE to defrag packet.
1038                  */
1039                 if ((mf == 1) && (frag == 0))
1040                         /*1658+6=1664, 1664 is 128 alignment.*/
1041                         alloc_sz = max_t(u16, tmp_len, 1658);
1042                 else
1043                         alloc_sz = tmp_len;
1044                 /* 2 is for IP header 4 bytes alignment in QoS packet case.
1045                  * 4 is for skb->data 4 bytes alignment.
1046                  */
1047                 alloc_sz += 6;
1048                 pkt_copy = netdev_alloc_skb(padapter->pnetdev, alloc_sz);
1049                 if (pkt_copy) {
1050                         precvframe->u.hdr.pkt = pkt_copy;
1051                         skb_reserve(pkt_copy, 4 - ((addr_t)(pkt_copy->data)
1052                                     % 4));
1053                         skb_reserve(pkt_copy, shift_sz);
1054                         memcpy(pkt_copy->data, pbuf, tmp_len);
1055                         precvframe->u.hdr.rx_head = precvframe->u.hdr.rx_data =
1056                                  precvframe->u.hdr.rx_tail = pkt_copy->data;
1057                         precvframe->u.hdr.rx_end = pkt_copy->data + alloc_sz;
1058                 } else {
1059                         precvframe->u.hdr.pkt = skb_clone(pskb, GFP_ATOMIC);
1060                         if (!precvframe->u.hdr.pkt)
1061                                 return;
1062                         precvframe->u.hdr.rx_head = pbuf;
1063                         precvframe->u.hdr.rx_data = pbuf;
1064                         precvframe->u.hdr.rx_tail = pbuf;
1065                         precvframe->u.hdr.rx_end = pbuf + alloc_sz;
1066                 }
1067                 recvframe_put(precvframe, tmp_len);
1068                 recvframe_pull(precvframe, drvinfo_sz + RXDESC_SIZE);
1069                 /* because the endian issue, driver avoid reference to the
1070                  * rxstat after calling update_recvframe_attrib_from_recvstat();
1071                  */
1072                 update_recvframe_attrib_from_recvstat(&precvframe->u.hdr.attrib,
1073                                                       prxstat);
1074                 r8712_recv_entry(precvframe);
1075                 transfer_len -= pkt_offset;
1076                 pbuf += pkt_offset;
1077                 pkt_cnt--;
1078                 precvframe = NULL;
1079                 pkt_copy = NULL;
1080         } while ((transfer_len > 0) && pkt_cnt > 0);
1081 }
1082 
1083 static void recv_tasklet(void *priv)
1084 {
1085         struct sk_buff *pskb;
1086         struct _adapter *padapter = priv;
1087         struct recv_priv *precvpriv = &padapter->recvpriv;
1088 
1089         while (NULL != (pskb = skb_dequeue(&precvpriv->rx_skb_queue))) {
1090                 recvbuf2recvframe(padapter, pskb);
1091                 skb_reset_tail_pointer(pskb);
1092                 pskb->len = 0;
1093                 if (!skb_cloned(pskb))
1094                         skb_queue_tail(&precvpriv->free_recv_skb_queue, pskb);
1095                 else
1096                         consume_skb(pskb);
1097         }
1098 }
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/staging/rtl8712/rtl8712_recv.c

DEFINITIONS
