drivers/staging/rtl8712/rtl871x_xmit.c

   1 /******************************************************************************
   2  * rtl871x_xmit.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 _RTL871X_XMIT_C_
  30
  31 #include "osdep_service.h"
  32 #include "drv_types.h"
  33 #include "wifi.h"
  34 #include "osdep_intf.h"
  35 #include "usb_ops.h"
  36
  37
  38 static const u8 P802_1H_OUI[P80211_OUI_LEN] = {0x00, 0x00, 0xf8};
  39 static const u8 RFC1042_OUI[P80211_OUI_LEN] = {0x00, 0x00, 0x00};
  40 static void init_hwxmits(struct hw_xmit *phwxmit, sint entry);
  41 static void alloc_hwxmits(struct _adapter *padapter);
  42 static void free_hwxmits(struct _adapter *padapter);
  43
  44 static void _init_txservq(struct tx_servq *ptxservq)
  45 {
  46         INIT_LIST_HEAD(&ptxservq->tx_pending);
  47         _init_queue(&ptxservq->sta_pending);
  48         ptxservq->qcnt = 0;
  49 }
  50
  51 void _r8712_init_sta_xmit_priv(struct sta_xmit_priv *psta_xmitpriv)
  52 {
  53         memset((unsigned char *)psta_xmitpriv, 0,
  54                  sizeof(struct sta_xmit_priv));
  55         spin_lock_init(&psta_xmitpriv->lock);
  56         _init_txservq(&psta_xmitpriv->be_q);
  57         _init_txservq(&psta_xmitpriv->bk_q);
  58         _init_txservq(&psta_xmitpriv->vi_q);
  59         _init_txservq(&psta_xmitpriv->vo_q);
  60         INIT_LIST_HEAD(&psta_xmitpriv->legacy_dz);
  61         INIT_LIST_HEAD(&psta_xmitpriv->apsd);
  62 }
  63
  64 sint _r8712_init_xmit_priv(struct xmit_priv *pxmitpriv,
  65                            struct _adapter *padapter)
  66 {
  67         sint i;
  68         struct xmit_buf *pxmitbuf;
  69         struct xmit_frame *pxframe;
  70
  71         memset((unsigned char *)pxmitpriv, 0, sizeof(struct xmit_priv));
  72         spin_lock_init(&pxmitpriv->lock);
  73         /*
  74         Please insert all the queue initialization using _init_queue below
  75         */
  76         pxmitpriv->adapter = padapter;
  77         _init_queue(&pxmitpriv->be_pending);
  78         _init_queue(&pxmitpriv->bk_pending);
  79         _init_queue(&pxmitpriv->vi_pending);
  80         _init_queue(&pxmitpriv->vo_pending);
  81         _init_queue(&pxmitpriv->bm_pending);
  82         _init_queue(&pxmitpriv->legacy_dz_queue);
  83         _init_queue(&pxmitpriv->apsd_queue);
  84         _init_queue(&pxmitpriv->free_xmit_queue);
  85         /*
  86         Please allocate memory with the sz = (struct xmit_frame) * NR_XMITFRAME,
  87         and initialize free_xmit_frame below.
  88         Please also apply  free_txobj to link_up all the xmit_frames...
  89         */
  90         pxmitpriv->pallocated_frame_buf = kmalloc(NR_XMITFRAME * sizeof(struct xmit_frame) + 4,
  91                                                   GFP_ATOMIC);
  92         if (pxmitpriv->pallocated_frame_buf == NULL) {
  93                 pxmitpriv->pxmit_frame_buf = NULL;
  94                 return _FAIL;
  95         }
  96         pxmitpriv->pxmit_frame_buf = pxmitpriv->pallocated_frame_buf + 4 -
  97                         ((addr_t) (pxmitpriv->pallocated_frame_buf) & 3);
  98         pxframe = (struct xmit_frame *) pxmitpriv->pxmit_frame_buf;
  99         for (i = 0; i < NR_XMITFRAME; i++) {
 100                 INIT_LIST_HEAD(&(pxframe->list));
 101                 pxframe->padapter = padapter;
 102                 pxframe->frame_tag = DATA_FRAMETAG;
 103                 pxframe->pkt = NULL;
 104                 pxframe->buf_addr = NULL;
 105                 pxframe->pxmitbuf = NULL;
 106                 list_add_tail(&(pxframe->list),
 107                                  &(pxmitpriv->free_xmit_queue.queue));
 108                 pxframe++;
 109         }
 110         pxmitpriv->free_xmitframe_cnt = NR_XMITFRAME;
 111         /*
 112                 init xmit hw_txqueue
 113         */
 114         _r8712_init_hw_txqueue(&pxmitpriv->be_txqueue, BE_QUEUE_INX);
 115         _r8712_init_hw_txqueue(&pxmitpriv->bk_txqueue, BK_QUEUE_INX);
 116         _r8712_init_hw_txqueue(&pxmitpriv->vi_txqueue, VI_QUEUE_INX);
 117         _r8712_init_hw_txqueue(&pxmitpriv->vo_txqueue, VO_QUEUE_INX);
 118         _r8712_init_hw_txqueue(&pxmitpriv->bmc_txqueue, BMC_QUEUE_INX);
 119         pxmitpriv->frag_len = MAX_FRAG_THRESHOLD;
 120         pxmitpriv->txirp_cnt = 1;
 121         /*per AC pending irp*/
 122         pxmitpriv->beq_cnt = 0;
 123         pxmitpriv->bkq_cnt = 0;
 124         pxmitpriv->viq_cnt = 0;
 125         pxmitpriv->voq_cnt = 0;
 126         /*init xmit_buf*/
 127         _init_queue(&pxmitpriv->free_xmitbuf_queue);
 128         _init_queue(&pxmitpriv->pending_xmitbuf_queue);
 129         pxmitpriv->pallocated_xmitbuf = kmalloc(NR_XMITBUFF * sizeof(struct xmit_buf) + 4,
 130                                                 GFP_ATOMIC);
 131         if (pxmitpriv->pallocated_xmitbuf  == NULL)
 132                 return _FAIL;
 133         pxmitpriv->pxmitbuf = pxmitpriv->pallocated_xmitbuf + 4 -
 134                               ((addr_t)(pxmitpriv->pallocated_xmitbuf) & 3);
 135         pxmitbuf = (struct xmit_buf *)pxmitpriv->pxmitbuf;
 136         for (i = 0; i < NR_XMITBUFF; i++) {
 137                 INIT_LIST_HEAD(&pxmitbuf->list);
 138                 pxmitbuf->pallocated_buf = kmalloc(MAX_XMITBUF_SZ + XMITBUF_ALIGN_SZ,
 139                                                    GFP_ATOMIC);
 140                 if (pxmitbuf->pallocated_buf == NULL)
 141                         return _FAIL;
 142                 pxmitbuf->pbuf = pxmitbuf->pallocated_buf + XMITBUF_ALIGN_SZ -
 143                                  ((addr_t) (pxmitbuf->pallocated_buf) &
 144                                  (XMITBUF_ALIGN_SZ - 1));
 145                 r8712_xmit_resource_alloc(padapter, pxmitbuf);
 146                 list_add_tail(&pxmitbuf->list,
 147                                  &(pxmitpriv->free_xmitbuf_queue.queue));
 148                 pxmitbuf++;
 149         }
 150         pxmitpriv->free_xmitbuf_cnt = NR_XMITBUFF;
 151         INIT_WORK(&padapter->wkFilterRxFF0, r8712_SetFilter);
 152         alloc_hwxmits(padapter);
 153         init_hwxmits(pxmitpriv->hwxmits, pxmitpriv->hwxmit_entry);
 154         tasklet_init(&pxmitpriv->xmit_tasklet,
 155                 (void(*)(unsigned long))r8712_xmit_bh,
 156                 (unsigned long)padapter);
 157         return _SUCCESS;
 158 }
 159
 160 void _free_xmit_priv(struct xmit_priv *pxmitpriv)
 161 {
 162         int i;
 163         struct _adapter *padapter = pxmitpriv->adapter;
 164         struct xmit_frame *pxmitframe = (struct xmit_frame *)
 165                                         pxmitpriv->pxmit_frame_buf;
 166         struct xmit_buf *pxmitbuf = (struct xmit_buf *)pxmitpriv->pxmitbuf;
 167
 168         if (pxmitpriv->pxmit_frame_buf == NULL)
 169                 return;
 170         for (i = 0; i < NR_XMITFRAME; i++) {
 171                 r8712_xmit_complete(padapter, pxmitframe);
 172                 pxmitframe++;
 173         }
 174         for (i = 0; i < NR_XMITBUFF; i++) {
 175                 r8712_xmit_resource_free(padapter, pxmitbuf);
 176                 kfree(pxmitbuf->pallocated_buf);
 177                 pxmitbuf++;
 178         }
 179         kfree(pxmitpriv->pallocated_frame_buf);
 180         kfree(pxmitpriv->pallocated_xmitbuf);
 181         free_hwxmits(padapter);
 182 }
 183
 184 sint r8712_update_attrib(struct _adapter *padapter, _pkt *pkt,
 185                    struct pkt_attrib *pattrib)
 186 {
 187         struct pkt_file pktfile;
 188         struct sta_info *psta = NULL;
 189         struct ethhdr etherhdr;
 190
 191         struct tx_cmd txdesc;
 192
 193         sint bmcast;
 194         struct sta_priv         *pstapriv = &padapter->stapriv;
 195         struct security_priv    *psecuritypriv = &padapter->securitypriv;
 196         struct mlme_priv        *pmlmepriv = &padapter->mlmepriv;
 197         struct qos_priv         *pqospriv = &pmlmepriv->qospriv;
 198
 199         _r8712_open_pktfile(pkt, &pktfile);
 200
 201         _r8712_pktfile_read(&pktfile, (unsigned char *)&etherhdr, ETH_HLEN);
 202
 203         pattrib->ether_type = ntohs(etherhdr.h_proto);
 204
 205 {
 206         u8 bool;
 207         /*If driver xmit ARP packet, driver can set ps mode to initial
 208          * setting. It stands for getting DHCP or fix IP.*/
 209         if (pattrib->ether_type == 0x0806) {
 210                 if (padapter->pwrctrlpriv.pwr_mode !=
 211                     padapter->registrypriv.power_mgnt) {
 212                         _cancel_timer(&(pmlmepriv->dhcp_timer), &bool);
 213                         r8712_set_ps_mode(padapter, padapter->registrypriv.
 214                                 power_mgnt, padapter->registrypriv.smart_ps);
 215                 }
 216         }
 217 }
 218         memcpy(pattrib->dst, &etherhdr.h_dest, ETH_ALEN);
 219         memcpy(pattrib->src, &etherhdr.h_source, ETH_ALEN);
 220         pattrib->pctrl = 0;
 221         if ((check_fwstate(pmlmepriv, WIFI_ADHOC_STATE) == true) ||
 222             (check_fwstate(pmlmepriv, WIFI_ADHOC_MASTER_STATE) == true)) {
 223                 memcpy(pattrib->ra, pattrib->dst, ETH_ALEN);
 224                 memcpy(pattrib->ta, pattrib->src, ETH_ALEN);
 225         } else if (check_fwstate(pmlmepriv, WIFI_STATION_STATE)) {
 226                 memcpy(pattrib->ra, get_bssid(pmlmepriv), ETH_ALEN);
 227                 memcpy(pattrib->ta, pattrib->src, ETH_ALEN);
 228         } else if (check_fwstate(pmlmepriv, WIFI_AP_STATE)) {
 229                 memcpy(pattrib->ra, pattrib->dst, ETH_ALEN);
 230                 memcpy(pattrib->ta, get_bssid(pmlmepriv), ETH_ALEN);
 231         } else if (check_fwstate(pmlmepriv, WIFI_MP_STATE) == true) {
 232                 /*firstly, filter packet not belongs to mp*/
 233                 if (pattrib->ether_type != 0x8712)
 234                         return _FAIL;
 235                 /* for mp storing the txcmd per packet,
 236                  * according to the info of txcmd to update pattrib */
 237                 /*get MP_TXDESC_SIZE bytes txcmd per packet*/
 238                 _r8712_pktfile_read(&pktfile, (u8 *)&txdesc, TXDESC_SIZE);
 239                 memcpy(pattrib->ra, pattrib->dst, ETH_ALEN);
 240                 memcpy(pattrib->ta, pattrib->src, ETH_ALEN);
 241                 pattrib->pctrl = 1;
 242         }
 243         /* r8712_xmitframe_coalesce() overwrite this!*/
 244         pattrib->pktlen = pktfile.pkt_len;
 245         if (ETH_P_IP == pattrib->ether_type) {
 246                 /* The following is for DHCP and ARP packet, we use cck1M to
 247                  * tx these packets and let LPS awake some time
 248                  * to prevent DHCP protocol fail */
 249                 u8 tmp[24];
 250
 251                 _r8712_pktfile_read(&pktfile, &tmp[0], 24);
 252                 pattrib->dhcp_pkt = 0;
 253                 if (pktfile.pkt_len > 282) {/*MINIMUM_DHCP_PACKET_SIZE)*/
 254                         if (ETH_P_IP == pattrib->ether_type) {/* IP header*/
 255                                 if (((tmp[21] == 68) && (tmp[23] == 67)) ||
 256                                         ((tmp[21] == 67) && (tmp[23] == 68))) {
 257                                         /* 68 : UDP BOOTP client
 258                                          * 67 : UDP BOOTP server
 259                                          * Use low rate to send DHCP packet.*/
 260                                         pattrib->dhcp_pkt = 1;
 261                                 }
 262                         }
 263                 }
 264         }
 265         bmcast = IS_MCAST(pattrib->ra);
 266         /* get sta_info*/
 267         if (bmcast) {
 268                 psta = r8712_get_bcmc_stainfo(padapter);
 269                 pattrib->mac_id = 4;
 270         } else {
 271                 if (check_fwstate(pmlmepriv, WIFI_MP_STATE) == true) {
 272                         psta = r8712_get_stainfo(pstapriv,
 273                                                  get_bssid(pmlmepriv));
 274                         pattrib->mac_id = 5;
 275                 } else {
 276                         psta = r8712_get_stainfo(pstapriv, pattrib->ra);
 277                         if (psta == NULL)  /* drop the pkt */
 278                                 return _FAIL;
 279                         if (check_fwstate(pmlmepriv, WIFI_STATION_STATE))
 280                                 pattrib->mac_id = 5;
 281                         else
 282                                 pattrib->mac_id = psta->mac_id;
 283                 }
 284         }
 285
 286         if (psta) {
 287                 pattrib->psta = psta;
 288         } else {
 289                 /* if we cannot get psta => drrp the pkt */
 290                 return _FAIL;
 291         }
 292
 293         pattrib->ack_policy = 0;
 294         /* get ether_hdr_len */
 295         pattrib->pkt_hdrlen = ETH_HLEN;
 296
 297         if (pqospriv->qos_option)
 298                 r8712_set_qos(&pktfile, pattrib);
 299         else {
 300                 pattrib->hdrlen = WLAN_HDR_A3_LEN;
 301                 pattrib->subtype = WIFI_DATA_TYPE;
 302                 pattrib->priority = 0;
 303         }
 304         if (psta->ieee8021x_blocked == true) {
 305                 pattrib->encrypt = 0;
 306                 if ((pattrib->ether_type != 0x888e) &&
 307                     (check_fwstate(pmlmepriv, WIFI_MP_STATE) == false))
 308                         return _FAIL;
 309         } else
 310                 GET_ENCRY_ALGO(psecuritypriv, psta, pattrib->encrypt, bmcast);
 311         switch (pattrib->encrypt) {
 312         case _WEP40_:
 313         case _WEP104_:
 314                 pattrib->iv_len = 4;
 315                 pattrib->icv_len = 4;
 316                 break;
 317         case _TKIP_:
 318                 pattrib->iv_len = 8;
 319                 pattrib->icv_len = 4;
 320                 if (padapter->securitypriv.busetkipkey == _FAIL)
 321                         return _FAIL;
 322                 break;
 323         case _AES_:
 324                 pattrib->iv_len = 8;
 325                 pattrib->icv_len = 8;
 326                 break;
 327         default:
 328                 pattrib->iv_len = 0;
 329                 pattrib->icv_len = 0;
 330                 break;
 331         }
 332
 333         if (pattrib->encrypt &&
 334             ((padapter->securitypriv.sw_encrypt == true) ||
 335              (psecuritypriv->hw_decrypted == false)))
 336                 pattrib->bswenc = true;
 337         else
 338                 pattrib->bswenc = false;
 339         /* if in MP_STATE, update pkt_attrib from mp_txcmd, and overwrite
 340          * some settings above.*/
 341         if (check_fwstate(pmlmepriv, WIFI_MP_STATE) == true)
 342                 pattrib->priority = (txdesc.txdw1 >> QSEL_SHT) & 0x1f;
 343         return _SUCCESS;
 344 }
 345
 346 static sint xmitframe_addmic(struct _adapter *padapter,
 347                              struct xmit_frame *pxmitframe)
 348 {
 349         u32     curfragnum, length;
 350         u8      *pframe, *payload, mic[8];
 351         struct  mic_data micdata;
 352         struct  sta_info *stainfo;
 353         struct  qos_priv *pqospriv = &(padapter->mlmepriv.qospriv);
 354         struct  pkt_attrib  *pattrib = &pxmitframe->attrib;
 355         struct  security_priv *psecuritypriv = &padapter->securitypriv;
 356         struct  xmit_priv *pxmitpriv = &padapter->xmitpriv;
 357         u8 priority[4] = {0x0, 0x0, 0x0, 0x0};
 358         sint bmcst = IS_MCAST(pattrib->ra);
 359
 360         if (pattrib->psta)
 361                 stainfo = pattrib->psta;
 362         else
 363                 stainfo = r8712_get_stainfo(&padapter->stapriv,
 364                                             &pattrib->ra[0]);
 365         if (pattrib->encrypt == _TKIP_) {
 366                 /*encode mic code*/
 367                 if (stainfo != NULL) {
 368                         u8 null_key[16] = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
 369                                            0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
 370                                            0x0, 0x0};
 371                         pframe = pxmitframe->buf_addr + TXDESC_OFFSET;
 372                         if (bmcst) {
 373                                 if (!memcmp(psecuritypriv->XGrptxmickey
 374                                    [psecuritypriv->XGrpKeyid].skey,
 375                                    null_key, 16))
 376                                         return _FAIL;
 377                                 /*start to calculate the mic code*/
 378                                 r8712_secmicsetkey(&micdata,
 379                                          psecuritypriv->
 380                                          XGrptxmickey[psecuritypriv->
 381                                         XGrpKeyid].skey);
 382                         } else {
 383                                 if (!memcmp(&stainfo->tkiptxmickey.skey[0],
 384                                             null_key, 16))
 385                                         return _FAIL;
 386                                 /* start to calculate the mic code */
 387                                 r8712_secmicsetkey(&micdata,
 388                                              &stainfo->tkiptxmickey.skey[0]);
 389                         }
 390                         if (pframe[1] & 1) {   /* ToDS==1 */
 391                                 r8712_secmicappend(&micdata,
 392                                                    &pframe[16], 6); /*DA*/
 393                                 if (pframe[1]&2)  /* From Ds==1 */
 394                                         r8712_secmicappend(&micdata,
 395                                                            &pframe[24], 6);
 396                                 else
 397                                         r8712_secmicappend(&micdata,
 398                                                            &pframe[10], 6);
 399                         } else {        /* ToDS==0 */
 400                                 r8712_secmicappend(&micdata,
 401                                                    &pframe[4], 6); /* DA */
 402                                 if (pframe[1]&2)  /* From Ds==1 */
 403                                         r8712_secmicappend(&micdata,
 404                                                            &pframe[16], 6);
 405                                 else
 406                                         r8712_secmicappend(&micdata,
 407                                                            &pframe[10], 6);
 408                         }
 409                         if (pqospriv->qos_option == 1)
 410                                         priority[0] = (u8)pxmitframe->
 411                                                       attrib.priority;
 412                         r8712_secmicappend(&micdata, &priority[0], 4);
 413                         payload = pframe;
 414                         for (curfragnum = 0; curfragnum < pattrib->nr_frags;
 415                              curfragnum++) {
 416                                 payload = (u8 *)RND4((addr_t)(payload));
 417                                 payload = payload+pattrib->
 418                                           hdrlen+pattrib->iv_len;
 419                                 if ((curfragnum + 1) == pattrib->nr_frags) {
 420                                         length = pattrib->last_txcmdsz -
 421                                                   pattrib->hdrlen -
 422                                                   pattrib->iv_len -
 423                                                   ((psecuritypriv->sw_encrypt)
 424                                                   ? pattrib->icv_len : 0);
 425                                         r8712_secmicappend(&micdata, payload,
 426                                                            length);
 427                                         payload = payload+length;
 428                                 } else{
 429                                         length = pxmitpriv->frag_len -
 430                                             pattrib->hdrlen-pattrib->iv_len -
 431                                             ((psecuritypriv->sw_encrypt) ?
 432                                             pattrib->icv_len : 0);
 433                                         r8712_secmicappend(&micdata, payload,
 434                                                            length);
 435                                         payload = payload + length +
 436                                                   pattrib->icv_len;
 437                                 }
 438                         }
 439                         r8712_secgetmic(&micdata, &(mic[0]));
 440                         /* add mic code  and add the mic code length in
 441                          * last_txcmdsz */
 442                         memcpy(payload, &(mic[0]), 8);
 443                         pattrib->last_txcmdsz += 8;
 444                         payload = payload-pattrib->last_txcmdsz + 8;
 445                 }
 446         }
 447         return _SUCCESS;
 448 }
 449
 450 static sint xmitframe_swencrypt(struct _adapter *padapter,
 451                                 struct xmit_frame *pxmitframe)
 452 {
 453         struct pkt_attrib       *pattrib = &pxmitframe->attrib;
 454
 455         if (pattrib->bswenc) {
 456                 switch (pattrib->encrypt) {
 457                 case _WEP40_:
 458                 case _WEP104_:
 459                         r8712_wep_encrypt(padapter, (u8 *)pxmitframe);
 460                         break;
 461                 case _TKIP_:
 462                         r8712_tkip_encrypt(padapter, (u8 *)pxmitframe);
 463                         break;
 464                 case _AES_:
 465                         r8712_aes_encrypt(padapter, (u8 *)pxmitframe);
 466                         break;
 467                 default:
 468                                 break;
 469                 }
 470         }
 471         return _SUCCESS;
 472 }
 473
 474 static sint make_wlanhdr(struct _adapter *padapter, u8 *hdr,
 475                          struct pkt_attrib *pattrib)
 476 {
 477         u16 *qc;
 478
 479         struct ieee80211_hdr *pwlanhdr = (struct ieee80211_hdr *)hdr;
 480         struct mlme_priv *pmlmepriv = &padapter->mlmepriv;
 481         struct qos_priv *pqospriv = &pmlmepriv->qospriv;
 482         u16 *fctrl = &pwlanhdr->frame_ctl;
 483
 484         memset(hdr, 0, WLANHDR_OFFSET);
 485         SetFrameSubType(fctrl, pattrib->subtype);
 486         if (pattrib->subtype & WIFI_DATA_TYPE) {
 487                 if (check_fwstate(pmlmepriv,  WIFI_STATION_STATE) == true) {
 488                         /* to_ds = 1, fr_ds = 0; */
 489                         SetToDs(fctrl);
 490                         memcpy(pwlanhdr->addr1, get_bssid(pmlmepriv),
 491                                 ETH_ALEN);
 492                         memcpy(pwlanhdr->addr2, pattrib->src, ETH_ALEN);
 493                         memcpy(pwlanhdr->addr3, pattrib->dst, ETH_ALEN);
 494                 } else if (check_fwstate(pmlmepriv, WIFI_AP_STATE) == true) {
 495                         /* to_ds = 0, fr_ds = 1; */
 496                         SetFrDs(fctrl);
 497                         memcpy(pwlanhdr->addr1, pattrib->dst, ETH_ALEN);
 498                         memcpy(pwlanhdr->addr2, get_bssid(pmlmepriv),
 499                                 ETH_ALEN);
 500                         memcpy(pwlanhdr->addr3, pattrib->src, ETH_ALEN);
 501                 } else if ((check_fwstate(pmlmepriv, WIFI_ADHOC_STATE) == true)
 502                            || (check_fwstate(pmlmepriv, WIFI_ADHOC_MASTER_STATE)
 503                            == true)) {
 504                         memcpy(pwlanhdr->addr1, pattrib->dst, ETH_ALEN);
 505                         memcpy(pwlanhdr->addr2, pattrib->src, ETH_ALEN);
 506                         memcpy(pwlanhdr->addr3, get_bssid(pmlmepriv),
 507                                 ETH_ALEN);
 508                 } else if (check_fwstate(pmlmepriv, WIFI_MP_STATE) == true) {
 509                         memcpy(pwlanhdr->addr1, pattrib->dst, ETH_ALEN);
 510                         memcpy(pwlanhdr->addr2, pattrib->src, ETH_ALEN);
 511                         memcpy(pwlanhdr->addr3, get_bssid(pmlmepriv),
 512                                 ETH_ALEN);
 513                 } else
 514                         return _FAIL;
 515
 516                 if (pattrib->encrypt)
 517                         SetPrivacy(fctrl);
 518                 if (pqospriv->qos_option) {
 519                         qc = (unsigned short *)(hdr + pattrib->hdrlen - 2);
 520                         if (pattrib->priority)
 521                                 SetPriority(qc, pattrib->priority);
 522                         SetAckpolicy(qc, pattrib->ack_policy);
 523                 }
 524                 /* TODO: fill HT Control Field */
 525                 /* Update Seq Num will be handled by f/w */
 526                 {
 527                         struct sta_info *psta;
 528                         sint bmcst = IS_MCAST(pattrib->ra);
 529
 530                         if (pattrib->psta)
 531                                 psta = pattrib->psta;
 532                         else {
 533                                 if (bmcst)
 534                                         psta = r8712_get_bcmc_stainfo(padapter);
 535                                 else
 536                                         psta =
 537                                          r8712_get_stainfo(&padapter->stapriv,
 538                                          pattrib->ra);
 539                         }
 540                         if (psta) {
 541                                 psta->sta_xmitpriv.txseq_tid
 542                                                   [pattrib->priority]++;
 543                                 psta->sta_xmitpriv.txseq_tid[pattrib->priority]
 544                                                    &= 0xFFF;
 545                                 pattrib->seqnum = psta->sta_xmitpriv.
 546                                                   txseq_tid[pattrib->priority];
 547                                 SetSeqNum(hdr, pattrib->seqnum);
 548                         }
 549                 }
 550         }
 551         return _SUCCESS;
 552 }
 553
 554 static sint r8712_put_snap(u8 *data, u16 h_proto)
 555 {
 556         struct ieee80211_snap_hdr *snap;
 557         const u8 *oui;
 558
 559         snap = (struct ieee80211_snap_hdr *)data;
 560         snap->dsap = 0xaa;
 561         snap->ssap = 0xaa;
 562         snap->ctrl = 0x03;
 563         if (h_proto == 0x8137 || h_proto == 0x80f3)
 564                 oui = P802_1H_OUI;
 565         else
 566                 oui = RFC1042_OUI;
 567         snap->oui[0] = oui[0];
 568         snap->oui[1] = oui[1];
 569         snap->oui[2] = oui[2];
 570         *(u16 *)(data + SNAP_SIZE) = htons(h_proto);
 571         return SNAP_SIZE + sizeof(u16);
 572 }
 573
 574 /*
 575  * This sub-routine will perform all the following:
 576  * 1. remove 802.3 header.
 577  * 2. create wlan_header, based on the info in pxmitframe
 578  * 3. append sta's iv/ext-iv
 579  * 4. append LLC
 580  * 5. move frag chunk from pframe to pxmitframe->mem
 581  * 6. apply sw-encrypt, if necessary.
 582  */
 583 sint r8712_xmitframe_coalesce(struct _adapter *padapter, _pkt *pkt,
 584                         struct xmit_frame *pxmitframe)
 585 {
 586         struct pkt_file pktfile;
 587
 588         sint    frg_len, mpdu_len, llc_sz;
 589         u32     mem_sz;
 590         u8      frg_inx;
 591         addr_t addr;
 592         u8 *pframe, *mem_start, *ptxdesc;
 593         struct sta_info         *psta;
 594         struct security_priv    *psecuritypriv = &padapter->securitypriv;
 595         struct mlme_priv        *pmlmepriv = &padapter->mlmepriv;
 596         struct xmit_priv        *pxmitpriv = &padapter->xmitpriv;
 597         struct pkt_attrib       *pattrib = &pxmitframe->attrib;
 598         u8 *pbuf_start;
 599         sint bmcst = IS_MCAST(pattrib->ra);
 600
 601         if (pattrib->psta == NULL)
 602                 return _FAIL;
 603         psta = pattrib->psta;
 604         if (pxmitframe->buf_addr == NULL)
 605                 return _FAIL;
 606         pbuf_start = pxmitframe->buf_addr;
 607         ptxdesc = pbuf_start;
 608         mem_start = pbuf_start + TXDESC_OFFSET;
 609         if (make_wlanhdr(padapter, mem_start, pattrib) == _FAIL)
 610                 return _FAIL;
 611         _r8712_open_pktfile(pkt, &pktfile);
 612         _r8712_pktfile_read(&pktfile, NULL, (uint) pattrib->pkt_hdrlen);
 613         if (check_fwstate(pmlmepriv, WIFI_MP_STATE) == true) {
 614                 /* truncate TXDESC_SIZE bytes txcmd if at mp mode for 871x */
 615                 if (pattrib->ether_type == 0x8712) {
 616                         /* take care -  update_txdesc overwrite this */
 617                         _r8712_pktfile_read(&pktfile, ptxdesc, TXDESC_SIZE);
 618                 }
 619         }
 620         pattrib->pktlen = pktfile.pkt_len;
 621         frg_inx = 0;
 622         frg_len = pxmitpriv->frag_len - 4;
 623         while (1) {
 624                 llc_sz = 0;
 625                 mpdu_len = frg_len;
 626                 pframe = mem_start;
 627                 SetMFrag(mem_start);
 628                 pframe += pattrib->hdrlen;
 629                 mpdu_len -= pattrib->hdrlen;
 630                 /* adding icv, if necessary...*/
 631                 if (pattrib->iv_len) {
 632                         if (psta != NULL) {
 633                                 switch (pattrib->encrypt) {
 634                                 case _WEP40_:
 635                                 case _WEP104_:
 636                                         WEP_IV(pattrib->iv, psta->txpn,
 637                                                (u8)psecuritypriv->
 638                                                PrivacyKeyIndex);
 639                                         break;
 640                                 case _TKIP_:
 641                                         if (bmcst)
 642                                                 TKIP_IV(pattrib->iv,
 643                                                     psta->txpn,
 644                                                     (u8)psecuritypriv->
 645                                                     XGrpKeyid);
 646                                         else
 647                                                 TKIP_IV(pattrib->iv, psta->txpn,
 648                                                         0);
 649                                         break;
 650                                 case _AES_:
 651                                         if (bmcst)
 652                                                 AES_IV(pattrib->iv, psta->txpn,
 653                                                     (u8)psecuritypriv->
 654                                                     XGrpKeyid);
 655                                         else
 656                                                 AES_IV(pattrib->iv, psta->txpn,
 657                                                        0);
 658                                         break;
 659                                 }
 660                         }
 661                         memcpy(pframe, pattrib->iv, pattrib->iv_len);
 662                         pframe += pattrib->iv_len;
 663                         mpdu_len -= pattrib->iv_len;
 664                 }
 665                 if (frg_inx == 0) {
 666                         llc_sz = r8712_put_snap(pframe, pattrib->ether_type);
 667                         pframe += llc_sz;
 668                         mpdu_len -= llc_sz;
 669                 }
 670                 if ((pattrib->icv_len > 0) && (pattrib->bswenc))
 671                         mpdu_len -= pattrib->icv_len;
 672                 if (bmcst)
 673                         mem_sz = _r8712_pktfile_read(&pktfile, pframe,
 674                                  pattrib->pktlen);
 675                 else
 676                         mem_sz = _r8712_pktfile_read(&pktfile, pframe,
 677                                  mpdu_len);
 678                 pframe += mem_sz;
 679                 if ((pattrib->icv_len > 0) && (pattrib->bswenc)) {
 680                         memcpy(pframe, pattrib->icv, pattrib->icv_len);
 681                         pframe += pattrib->icv_len;
 682                 }
 683                 frg_inx++;
 684                 if (bmcst || (r8712_endofpktfile(&pktfile) == true)) {
 685                         pattrib->nr_frags = frg_inx;
 686                         pattrib->last_txcmdsz = pattrib->hdrlen +
 687                                                 pattrib->iv_len +
 688                                                 ((pattrib->nr_frags == 1) ?
 689                                                 llc_sz : 0) +
 690                                                 ((pattrib->bswenc) ?
 691                                                 pattrib->icv_len : 0) + mem_sz;
 692                         ClearMFrag(mem_start);
 693                         break;
 694                 }
 695                 addr = (addr_t)(pframe);
 696                 mem_start = (unsigned char *)RND4(addr) + TXDESC_OFFSET;
 697                 memcpy(mem_start, pbuf_start + TXDESC_OFFSET, pattrib->hdrlen);
 698         }
 699
 700         if (xmitframe_addmic(padapter, pxmitframe) == _FAIL)
 701                 return _FAIL;
 702         xmitframe_swencrypt(padapter, pxmitframe);
 703         return _SUCCESS;
 704 }
 705
 706 void r8712_update_protection(struct _adapter *padapter, u8 *ie, uint ie_len)
 707 {
 708         uint    protection;
 709         u8      *perp;
 710         sint     erp_len;
 711         struct  xmit_priv *pxmitpriv = &padapter->xmitpriv;
 712         struct  registry_priv *pregistrypriv = &padapter->registrypriv;
 713
 714         switch (pxmitpriv->vcs_setting) {
 715         case DISABLE_VCS:
 716                 pxmitpriv->vcs = NONE_VCS;
 717                 break;
 718         case ENABLE_VCS:
 719                 break;
 720         case AUTO_VCS:
 721         default:
 722                 perp = r8712_get_ie(ie, _ERPINFO_IE_, &erp_len, ie_len);
 723                 if (perp == NULL)
 724                         pxmitpriv->vcs = NONE_VCS;
 725                 else {
 726                         protection = (*(perp + 2)) & BIT(1);
 727                         if (protection) {
 728                                 if (pregistrypriv->vcs_type == RTS_CTS)
 729                                         pxmitpriv->vcs = RTS_CTS;
 730                                 else
 731                                         pxmitpriv->vcs = CTS_TO_SELF;
 732                         } else
 733                                 pxmitpriv->vcs = NONE_VCS;
 734                 }
 735                 break;
 736         }
 737 }
 738
 739 struct xmit_buf *r8712_alloc_xmitbuf(struct xmit_priv *pxmitpriv)
 740 {
 741         unsigned long irqL;
 742         struct xmit_buf *pxmitbuf =  NULL;
 743         struct list_head *plist, *phead;
 744         struct  __queue *pfree_xmitbuf_queue = &pxmitpriv->free_xmitbuf_queue;
 745
 746         spin_lock_irqsave(&pfree_xmitbuf_queue->lock, irqL);
 747         if (list_empty(&pfree_xmitbuf_queue->queue))
 748                 pxmitbuf = NULL;
 749         else {
 750                 phead = &pfree_xmitbuf_queue->queue;
 751                 plist = phead->next;
 752                 pxmitbuf = LIST_CONTAINOR(plist, struct xmit_buf, list);
 753                 list_del_init(&(pxmitbuf->list));
 754         }
 755         if (pxmitbuf !=  NULL)
 756                 pxmitpriv->free_xmitbuf_cnt--;
 757         spin_unlock_irqrestore(&pfree_xmitbuf_queue->lock, irqL);
 758         return pxmitbuf;
 759 }
 760
 761 int r8712_free_xmitbuf(struct xmit_priv *pxmitpriv, struct xmit_buf *pxmitbuf)
 762 {
 763         unsigned long irqL;
 764         struct  __queue *pfree_xmitbuf_queue = &pxmitpriv->free_xmitbuf_queue;
 765
 766         if (pxmitbuf == NULL)
 767                 return _FAIL;
 768         spin_lock_irqsave(&pfree_xmitbuf_queue->lock, irqL);
 769         list_del_init(&pxmitbuf->list);
 770         list_add_tail(&(pxmitbuf->list), &pfree_xmitbuf_queue->queue);
 771         pxmitpriv->free_xmitbuf_cnt++;
 772         spin_unlock_irqrestore(&pfree_xmitbuf_queue->lock, irqL);
 773         return _SUCCESS;
 774 }
 775
 776 /*
 777 Calling context:
 778 1. OS_TXENTRY
 779 2. RXENTRY (rx_thread or RX_ISR/RX_CallBack)
 780
 781 If we turn on USE_RXTHREAD, then, no need for critical section.
 782 Otherwise, we must use _enter/_exit critical to protect free_xmit_queue...
 783
 784 Must be very very cautious...
 785
 786 */
 787
 788 struct xmit_frame *r8712_alloc_xmitframe(struct xmit_priv *pxmitpriv)
 789 {
 790         /*
 791                 Please remember to use all the osdep_service api,
 792                 and lock/unlock or _enter/_exit critical to protect
 793                 pfree_xmit_queue
 794         */
 795         unsigned long irqL;
 796         struct xmit_frame *pxframe = NULL;
 797         struct list_head *plist, *phead;
 798         struct  __queue *pfree_xmit_queue = &pxmitpriv->free_xmit_queue;
 799
 800         spin_lock_irqsave(&pfree_xmit_queue->lock, irqL);
 801         if (list_empty(&pfree_xmit_queue->queue))
 802                 pxframe =  NULL;
 803         else {
 804                 phead = &pfree_xmit_queue->queue;
 805                 plist = phead->next;
 806                 pxframe = LIST_CONTAINOR(plist, struct xmit_frame, list);
 807                 list_del_init(&(pxframe->list));
 808         }
 809         if (pxframe !=  NULL) {
 810                 pxmitpriv->free_xmitframe_cnt--;
 811                 pxframe->buf_addr = NULL;
 812                 pxframe->pxmitbuf = NULL;
 813                 pxframe->attrib.psta = NULL;
 814                 pxframe->pkt = NULL;
 815         }
 816         spin_unlock_irqrestore(&pfree_xmit_queue->lock, irqL);
 817         return pxframe;
 818 }
 819
 820 void r8712_free_xmitframe(struct xmit_priv *pxmitpriv,
 821                           struct xmit_frame *pxmitframe)
 822 {
 823         unsigned long irqL;
 824         struct  __queue *pfree_xmit_queue = &pxmitpriv->free_xmit_queue;
 825         struct _adapter *padapter = pxmitpriv->adapter;
 826
 827         if (pxmitframe == NULL)
 828                 return;
 829         spin_lock_irqsave(&pfree_xmit_queue->lock, irqL);
 830         list_del_init(&pxmitframe->list);
 831         if (pxmitframe->pkt)
 832                 pxmitframe->pkt = NULL;
 833         list_add_tail(&pxmitframe->list, &pfree_xmit_queue->queue);
 834         pxmitpriv->free_xmitframe_cnt++;
 835         spin_unlock_irqrestore(&pfree_xmit_queue->lock, irqL);
 836         if (netif_queue_stopped(padapter->pnetdev))
 837                 netif_wake_queue(padapter->pnetdev);
 838 }
 839
 840 void r8712_free_xmitframe_ex(struct xmit_priv *pxmitpriv,
 841                       struct xmit_frame *pxmitframe)
 842 {
 843         if (pxmitframe == NULL)
 844                 return;
 845         if (pxmitframe->frame_tag == DATA_FRAMETAG)
 846                 r8712_free_xmitframe(pxmitpriv, pxmitframe);
 847 }
 848
 849 void r8712_free_xmitframe_queue(struct xmit_priv *pxmitpriv,
 850                                 struct  __queue *pframequeue)
 851 {
 852         unsigned long irqL;
 853         struct list_head *plist, *phead;
 854         struct  xmit_frame      *pxmitframe;
 855
 856         spin_lock_irqsave(&(pframequeue->lock), irqL);
 857         phead = &pframequeue->queue;
 858         plist = phead->next;
 859         while (end_of_queue_search(phead, plist) == false) {
 860                 pxmitframe = LIST_CONTAINOR(plist, struct xmit_frame, list);
 861                 plist = plist->next;
 862                 r8712_free_xmitframe(pxmitpriv, pxmitframe);
 863         }
 864         spin_unlock_irqrestore(&(pframequeue->lock), irqL);
 865 }
 866
 867 static inline struct tx_servq *get_sta_pending(struct _adapter *padapter,
 868                                                struct  __queue **ppstapending,
 869                                                struct sta_info *psta, sint up)
 870 {
 871
 872         struct tx_servq *ptxservq;
 873         struct hw_xmit *phwxmits =  padapter->xmitpriv.hwxmits;
 874
 875         switch (up) {
 876         case 1:
 877         case 2:
 878                 ptxservq = &(psta->sta_xmitpriv.bk_q);
 879                 *ppstapending = &padapter->xmitpriv.bk_pending;
 880                 (phwxmits+3)->accnt++;
 881                 break;
 882         case 4:
 883         case 5:
 884                 ptxservq = &(psta->sta_xmitpriv.vi_q);
 885                 *ppstapending = &padapter->xmitpriv.vi_pending;
 886                 (phwxmits+1)->accnt++;
 887                 break;
 888         case 6:
 889         case 7:
 890                 ptxservq = &(psta->sta_xmitpriv.vo_q);
 891                 *ppstapending = &padapter->xmitpriv.vo_pending;
 892                 (phwxmits+0)->accnt++;
 893                 break;
 894         case 0:
 895         case 3:
 896         default:
 897                 ptxservq = &(psta->sta_xmitpriv.be_q);
 898                 *ppstapending = &padapter->xmitpriv.be_pending;
 899                 (phwxmits + 2)->accnt++;
 900                 break;
 901         }
 902         return ptxservq;
 903 }
 904
 905 /*
 906  * Will enqueue pxmitframe to the proper queue, and indicate it
 907  * to xx_pending list.....
 908  */
 909 sint r8712_xmit_classifier(struct _adapter *padapter,
 910                            struct xmit_frame *pxmitframe)
 911 {
 912         unsigned long irqL0;
 913         struct  __queue *pstapending;
 914         struct sta_info *psta;
 915         struct tx_servq *ptxservq;
 916         struct pkt_attrib *pattrib = &pxmitframe->attrib;
 917         struct sta_priv *pstapriv = &padapter->stapriv;
 918         struct mlme_priv *pmlmepriv = &padapter->mlmepriv;
 919         sint bmcst = IS_MCAST(pattrib->ra);
 920
 921         if (pattrib->psta)
 922                 psta = pattrib->psta;
 923         else {
 924                 if (bmcst)
 925                         psta = r8712_get_bcmc_stainfo(padapter);
 926                 else {
 927                         if (check_fwstate(pmlmepriv, WIFI_MP_STATE) == true)
 928                                 psta = r8712_get_stainfo(pstapriv,
 929                                        get_bssid(pmlmepriv));
 930                         else
 931                                 psta = r8712_get_stainfo(pstapriv, pattrib->ra);
 932                 }
 933         }
 934         if (psta == NULL)
 935                 return _FAIL;
 936         ptxservq = get_sta_pending(padapter, &pstapending,
 937                    psta, pattrib->priority);
 938         spin_lock_irqsave(&pstapending->lock, irqL0);
 939         if (list_empty(&ptxservq->tx_pending))
 940                 list_add_tail(&ptxservq->tx_pending, &pstapending->queue);
 941         list_add_tail(&pxmitframe->list, &ptxservq->sta_pending.queue);
 942         ptxservq->qcnt++;
 943         spin_unlock_irqrestore(&pstapending->lock, irqL0);
 944         return _SUCCESS;
 945 }
 946
 947 static void alloc_hwxmits(struct _adapter *padapter)
 948 {
 949         struct hw_xmit *hwxmits;
 950         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
 951
 952         pxmitpriv->hwxmit_entry = HWXMIT_ENTRY;
 953         pxmitpriv->hwxmits = kmalloc_array(pxmitpriv->hwxmit_entry,
 954                                 sizeof(struct hw_xmit), GFP_ATOMIC);
 955         if (pxmitpriv->hwxmits == NULL)
 956                 return;
 957         hwxmits = pxmitpriv->hwxmits;
 958         if (pxmitpriv->hwxmit_entry == 5) {
 959                 pxmitpriv->bmc_txqueue.head = 0;
 960                 hwxmits[0] .phwtxqueue = &pxmitpriv->bmc_txqueue;
 961                 hwxmits[0] .sta_queue = &pxmitpriv->bm_pending;
 962                 pxmitpriv->vo_txqueue.head = 0;
 963                 hwxmits[1] .phwtxqueue = &pxmitpriv->vo_txqueue;
 964                 hwxmits[1] .sta_queue = &pxmitpriv->vo_pending;
 965         pxmitpriv->vi_txqueue.head = 0;
 966                 hwxmits[2] .phwtxqueue = &pxmitpriv->vi_txqueue;
 967                 hwxmits[2] .sta_queue = &pxmitpriv->vi_pending;
 968                 pxmitpriv->bk_txqueue.head = 0;
 969                 hwxmits[3] .phwtxqueue = &pxmitpriv->bk_txqueue;
 970                 hwxmits[3] .sta_queue = &pxmitpriv->bk_pending;
 971                 pxmitpriv->be_txqueue.head = 0;
 972                 hwxmits[4] .phwtxqueue = &pxmitpriv->be_txqueue;
 973                 hwxmits[4] .sta_queue = &pxmitpriv->be_pending;
 974         } else if (pxmitpriv->hwxmit_entry == 4) {
 975                 pxmitpriv->vo_txqueue.head = 0;
 976                 hwxmits[0] .phwtxqueue = &pxmitpriv->vo_txqueue;
 977                 hwxmits[0] .sta_queue = &pxmitpriv->vo_pending;
 978                 pxmitpriv->vi_txqueue.head = 0;
 979                 hwxmits[1] .phwtxqueue = &pxmitpriv->vi_txqueue;
 980                 hwxmits[1] .sta_queue = &pxmitpriv->vi_pending;
 981                 pxmitpriv->be_txqueue.head = 0;
 982                 hwxmits[2] .phwtxqueue = &pxmitpriv->be_txqueue;
 983                 hwxmits[2] .sta_queue = &pxmitpriv->be_pending;
 984                 pxmitpriv->bk_txqueue.head = 0;
 985                 hwxmits[3] .phwtxqueue = &pxmitpriv->bk_txqueue;
 986                 hwxmits[3] .sta_queue = &pxmitpriv->bk_pending;
 987         }
 988 }
 989
 990 static void free_hwxmits(struct _adapter *padapter)
 991 {
 992         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
 993
 994         kfree(pxmitpriv->hwxmits);
 995 }
 996
 997 static void init_hwxmits(struct hw_xmit *phwxmit, sint entry)
 998 {
 999         sint i;
1000
1001         for (i = 0; i < entry; i++, phwxmit++) {
1002                 spin_lock_init(&phwxmit->xmit_lock);
1003                 INIT_LIST_HEAD(&phwxmit->pending);
1004                 phwxmit->txcmdcnt = 0;
1005                 phwxmit->accnt = 0;
1006         }
1007 }
1008
1009 void xmitframe_xmitbuf_attach(struct xmit_frame *pxmitframe,
1010                         struct xmit_buf *pxmitbuf)
1011 {
1012         /* pxmitbuf attach to pxmitframe */
1013         pxmitframe->pxmitbuf = pxmitbuf;
1014         /* urb and irp connection */
1015         pxmitframe->pxmit_urb[0] = pxmitbuf->pxmit_urb[0];
1016         /* buffer addr assoc */
1017         pxmitframe->buf_addr = pxmitbuf->pbuf;
1018         /* pxmitframe attach to pxmitbuf */
1019         pxmitbuf->priv_data = pxmitframe;
1020 }
1021
1022 /*
1023  * tx_action == 0 == no frames to transmit
1024  * tx_action > 0 ==> we have frames to transmit
1025  * tx_action < 0 ==> we have frames to transmit, but TXFF is not even enough
1026  *                                               to transmit 1 frame.
1027  */
1028
1029 int r8712_pre_xmit(struct _adapter *padapter, struct xmit_frame *pxmitframe)
1030 {
1031         unsigned long irqL;
1032         int ret;
1033         struct xmit_buf *pxmitbuf = NULL;
1034         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
1035         struct pkt_attrib *pattrib = &pxmitframe->attrib;
1036
1037         r8712_do_queue_select(padapter, pattrib);
1038         spin_lock_irqsave(&pxmitpriv->lock, irqL);
1039         if (r8712_txframes_sta_ac_pending(padapter, pattrib) > 0) {
1040                 ret = false;
1041                 r8712_xmit_enqueue(padapter, pxmitframe);
1042                 spin_unlock_irqrestore(&pxmitpriv->lock, irqL);
1043                 return ret;
1044         }
1045         pxmitbuf = r8712_alloc_xmitbuf(pxmitpriv);
1046         if (pxmitbuf == NULL) { /*enqueue packet*/
1047                 ret = false;
1048                 r8712_xmit_enqueue(padapter, pxmitframe);
1049                 spin_unlock_irqrestore(&pxmitpriv->lock, irqL);
1050         } else { /*dump packet directly*/
1051                 spin_unlock_irqrestore(&pxmitpriv->lock, irqL);
1052                 ret = true;
1053                 xmitframe_xmitbuf_attach(pxmitframe, pxmitbuf);
1054                 r8712_xmit_direct(padapter, pxmitframe);
1055         }
1056         return ret;
1057 }