kernel/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         /*If driver xmit ARP packet, driver can set ps mode to initial
 207          * setting. It stands for getting DHCP or fix IP.*/
 208         if (pattrib->ether_type == 0x0806) {
 209                 if (padapter->pwrctrlpriv.pwr_mode !=
 210                     padapter->registrypriv.power_mgnt) {
 211                         del_timer_sync(&pmlmepriv->dhcp_timer);
 212                         r8712_set_ps_mode(padapter, padapter->registrypriv.
 213                                 power_mgnt, padapter->registrypriv.smart_ps);
 214                 }
 215         }
 216 }
 217         memcpy(pattrib->dst, &etherhdr.h_dest, ETH_ALEN);
 218         memcpy(pattrib->src, &etherhdr.h_source, ETH_ALEN);
 219         pattrib->pctrl = 0;
 220         if (check_fwstate(pmlmepriv, WIFI_ADHOC_STATE) ||
 221             check_fwstate(pmlmepriv, WIFI_ADHOC_MASTER_STATE)) {
 222                 memcpy(pattrib->ra, pattrib->dst, ETH_ALEN);
 223                 memcpy(pattrib->ta, pattrib->src, ETH_ALEN);
 224         } else if (check_fwstate(pmlmepriv, WIFI_STATION_STATE)) {
 225                 memcpy(pattrib->ra, get_bssid(pmlmepriv), ETH_ALEN);
 226                 memcpy(pattrib->ta, pattrib->src, ETH_ALEN);
 227         } else if (check_fwstate(pmlmepriv, WIFI_AP_STATE)) {
 228                 memcpy(pattrib->ra, pattrib->dst, ETH_ALEN);
 229                 memcpy(pattrib->ta, get_bssid(pmlmepriv), ETH_ALEN);
 230         } else if (check_fwstate(pmlmepriv, WIFI_MP_STATE)) {
 231                 /*firstly, filter packet not belongs to mp*/
 232                 if (pattrib->ether_type != 0x8712)
 233                         return _FAIL;
 234                 /* for mp storing the txcmd per packet,
 235                  * according to the info of txcmd to update pattrib */
 236                 /*get MP_TXDESC_SIZE bytes txcmd per packet*/
 237                 _r8712_pktfile_read(&pktfile, (u8 *)&txdesc, TXDESC_SIZE);
 238                 memcpy(pattrib->ra, pattrib->dst, ETH_ALEN);
 239                 memcpy(pattrib->ta, pattrib->src, ETH_ALEN);
 240                 pattrib->pctrl = 1;
 241         }
 242         /* r8712_xmitframe_coalesce() overwrite this!*/
 243         pattrib->pktlen = pktfile.pkt_len;
 244         if (ETH_P_IP == pattrib->ether_type) {
 245                 /* The following is for DHCP and ARP packet, we use cck1M to
 246                  * tx these packets and let LPS awake some time
 247                  * to prevent DHCP protocol fail */
 248                 u8 tmp[24];
 249
 250                 _r8712_pktfile_read(&pktfile, &tmp[0], 24);
 251                 pattrib->dhcp_pkt = 0;
 252                 if (pktfile.pkt_len > 282) {/*MINIMUM_DHCP_PACKET_SIZE)*/
 253                         if (ETH_P_IP == pattrib->ether_type) {/* IP header*/
 254                                 if (((tmp[21] == 68) && (tmp[23] == 67)) ||
 255                                         ((tmp[21] == 67) && (tmp[23] == 68))) {
 256                                         /* 68 : UDP BOOTP client
 257                                          * 67 : UDP BOOTP server
 258                                          * Use low rate to send DHCP packet.*/
 259                                         pattrib->dhcp_pkt = 1;
 260                                 }
 261                         }
 262                 }
 263         }
 264         bmcast = IS_MCAST(pattrib->ra);
 265         /* get sta_info*/
 266         if (bmcast) {
 267                 psta = r8712_get_bcmc_stainfo(padapter);
 268                 pattrib->mac_id = 4;
 269         } else {
 270                 if (check_fwstate(pmlmepriv, WIFI_MP_STATE)) {
 271                         psta = r8712_get_stainfo(pstapriv,
 272                                                  get_bssid(pmlmepriv));
 273                         pattrib->mac_id = 5;
 274                 } else {
 275                         psta = r8712_get_stainfo(pstapriv, pattrib->ra);
 276                         if (psta == NULL)  /* drop the pkt */
 277                                 return _FAIL;
 278                         if (check_fwstate(pmlmepriv, WIFI_STATION_STATE))
 279                                 pattrib->mac_id = 5;
 280                         else
 281                                 pattrib->mac_id = psta->mac_id;
 282                 }
 283         }
 284
 285         if (psta) {
 286                 pattrib->psta = psta;
 287         } else {
 288                 /* if we cannot get psta => drrp the pkt */
 289                 return _FAIL;
 290         }
 291
 292         pattrib->ack_policy = 0;
 293         /* get ether_hdr_len */
 294         pattrib->pkt_hdrlen = ETH_HLEN;
 295
 296         if (pqospriv->qos_option) {
 297                 r8712_set_qos(&pktfile, pattrib);
 298         } else {
 299                 pattrib->hdrlen = WLAN_HDR_A3_LEN;
 300                 pattrib->subtype = WIFI_DATA_TYPE;
 301                 pattrib->priority = 0;
 302         }
 303         if (psta->ieee8021x_blocked) {
 304                 pattrib->encrypt = 0;
 305                 if ((pattrib->ether_type != 0x888e) &&
 306                     !check_fwstate(pmlmepriv, WIFI_MP_STATE))
 307                         return _FAIL;
 308         } else {
 309                 GET_ENCRY_ALGO(psecuritypriv, psta, pattrib->encrypt, bmcast);
 310         }
 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 ||
 335             !psecuritypriv->hw_decrypted))
 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))
 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)) {
 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)) {
 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) ||
 502                            check_fwstate(pmlmepriv,
 503                                          WIFI_ADHOC_MASTER_STATE)) {
 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)) {
 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
 517                 if (pattrib->encrypt)
 518                         SetPrivacy(fctrl);
 519                 if (pqospriv->qos_option) {
 520                         qc = (unsigned short *)(hdr + pattrib->hdrlen - 2);
 521                         if (pattrib->priority)
 522                                 SetPriority(qc, pattrib->priority);
 523                         SetAckpolicy(qc, pattrib->ack_policy);
 524                 }
 525                 /* TODO: fill HT Control Field */
 526                 /* Update Seq Num will be handled by f/w */
 527                 {
 528                         struct sta_info *psta;
 529                         sint bmcst = IS_MCAST(pattrib->ra);
 530
 531                         if (pattrib->psta) {
 532                                 psta = pattrib->psta;
 533                         } else {
 534                                 if (bmcst)
 535                                         psta = r8712_get_bcmc_stainfo(padapter);
 536                                 else
 537                                         psta =
 538                                          r8712_get_stainfo(&padapter->stapriv,
 539                                          pattrib->ra);
 540                         }
 541                         if (psta) {
 542                                 psta->sta_xmitpriv.txseq_tid
 543                                                   [pattrib->priority]++;
 544                                 psta->sta_xmitpriv.txseq_tid[pattrib->priority]
 545                                                    &= 0xFFF;
 546                                 pattrib->seqnum = psta->sta_xmitpriv.
 547                                                   txseq_tid[pattrib->priority];
 548                                 SetSeqNum(hdr, pattrib->seqnum);
 549                         }
 550                 }
 551         }
 552         return _SUCCESS;
 553 }
 554
 555 static sint r8712_put_snap(u8 *data, u16 h_proto)
 556 {
 557         struct ieee80211_snap_hdr *snap;
 558         const u8 *oui;
 559
 560         snap = (struct ieee80211_snap_hdr *)data;
 561         snap->dsap = 0xaa;
 562         snap->ssap = 0xaa;
 563         snap->ctrl = 0x03;
 564         if (h_proto == 0x8137 || h_proto == 0x80f3)
 565                 oui = P802_1H_OUI;
 566         else
 567                 oui = RFC1042_OUI;
 568         snap->oui[0] = oui[0];
 569         snap->oui[1] = oui[1];
 570         snap->oui[2] = oui[2];
 571         *(u16 *)(data + SNAP_SIZE) = htons(h_proto);
 572         return SNAP_SIZE + sizeof(u16);
 573 }
 574
 575 /*
 576  * This sub-routine will perform all the following:
 577  * 1. remove 802.3 header.
 578  * 2. create wlan_header, based on the info in pxmitframe
 579  * 3. append sta's iv/ext-iv
 580  * 4. append LLC
 581  * 5. move frag chunk from pframe to pxmitframe->mem
 582  * 6. apply sw-encrypt, if necessary.
 583  */
 584 sint r8712_xmitframe_coalesce(struct _adapter *padapter, _pkt *pkt,
 585                         struct xmit_frame *pxmitframe)
 586 {
 587         struct pkt_file pktfile;
 588
 589         sint    frg_len, mpdu_len, llc_sz;
 590         u32     mem_sz;
 591         u8      frg_inx;
 592         addr_t addr;
 593         u8 *pframe, *mem_start, *ptxdesc;
 594         struct sta_info         *psta;
 595         struct security_priv    *psecuritypriv = &padapter->securitypriv;
 596         struct mlme_priv        *pmlmepriv = &padapter->mlmepriv;
 597         struct xmit_priv        *pxmitpriv = &padapter->xmitpriv;
 598         struct pkt_attrib       *pattrib = &pxmitframe->attrib;
 599         u8 *pbuf_start;
 600         sint bmcst = IS_MCAST(pattrib->ra);
 601
 602         if (pattrib->psta == NULL)
 603                 return _FAIL;
 604         psta = pattrib->psta;
 605         if (pxmitframe->buf_addr == NULL)
 606                 return _FAIL;
 607         pbuf_start = pxmitframe->buf_addr;
 608         ptxdesc = pbuf_start;
 609         mem_start = pbuf_start + TXDESC_OFFSET;
 610         if (make_wlanhdr(padapter, mem_start, pattrib) == _FAIL)
 611                 return _FAIL;
 612         _r8712_open_pktfile(pkt, &pktfile);
 613         _r8712_pktfile_read(&pktfile, NULL, (uint) pattrib->pkt_hdrlen);
 614         if (check_fwstate(pmlmepriv, WIFI_MP_STATE)) {
 615                 /* truncate TXDESC_SIZE bytes txcmd if at mp mode for 871x */
 616                 if (pattrib->ether_type == 0x8712) {
 617                         /* take care -  update_txdesc overwrite this */
 618                         _r8712_pktfile_read(&pktfile, ptxdesc, TXDESC_SIZE);
 619                 }
 620         }
 621         pattrib->pktlen = pktfile.pkt_len;
 622         frg_inx = 0;
 623         frg_len = pxmitpriv->frag_len - 4;
 624         while (1) {
 625                 llc_sz = 0;
 626                 mpdu_len = frg_len;
 627                 pframe = mem_start;
 628                 SetMFrag(mem_start);
 629                 pframe += pattrib->hdrlen;
 630                 mpdu_len -= pattrib->hdrlen;
 631                 /* adding icv, if necessary...*/
 632                 if (pattrib->iv_len) {
 633                         if (psta != NULL) {
 634                                 switch (pattrib->encrypt) {
 635                                 case _WEP40_:
 636                                 case _WEP104_:
 637                                         WEP_IV(pattrib->iv, psta->txpn,
 638                                                (u8)psecuritypriv->
 639                                                PrivacyKeyIndex);
 640                                         break;
 641                                 case _TKIP_:
 642                                         if (bmcst)
 643                                                 TKIP_IV(pattrib->iv,
 644                                                     psta->txpn,
 645                                                     (u8)psecuritypriv->
 646                                                     XGrpKeyid);
 647                                         else
 648                                                 TKIP_IV(pattrib->iv, psta->txpn,
 649                                                         0);
 650                                         break;
 651                                 case _AES_:
 652                                         if (bmcst)
 653                                                 AES_IV(pattrib->iv, psta->txpn,
 654                                                     (u8)psecuritypriv->
 655                                                     XGrpKeyid);
 656                                         else
 657                                                 AES_IV(pattrib->iv, psta->txpn,
 658                                                        0);
 659                                         break;
 660                                 }
 661                         }
 662                         memcpy(pframe, pattrib->iv, pattrib->iv_len);
 663                         pframe += pattrib->iv_len;
 664                         mpdu_len -= pattrib->iv_len;
 665                 }
 666                 if (frg_inx == 0) {
 667                         llc_sz = r8712_put_snap(pframe, pattrib->ether_type);
 668                         pframe += llc_sz;
 669                         mpdu_len -= llc_sz;
 670                 }
 671                 if ((pattrib->icv_len > 0) && (pattrib->bswenc))
 672                         mpdu_len -= pattrib->icv_len;
 673                 if (bmcst)
 674                         mem_sz = _r8712_pktfile_read(&pktfile, pframe,
 675                                  pattrib->pktlen);
 676                 else
 677                         mem_sz = _r8712_pktfile_read(&pktfile, pframe,
 678                                  mpdu_len);
 679                 pframe += mem_sz;
 680                 if ((pattrib->icv_len > 0) && (pattrib->bswenc)) {
 681                         memcpy(pframe, pattrib->icv, pattrib->icv_len);
 682                         pframe += pattrib->icv_len;
 683                 }
 684                 frg_inx++;
 685                 if (bmcst || r8712_endofpktfile(&pktfile)) {
 686                         pattrib->nr_frags = frg_inx;
 687                         pattrib->last_txcmdsz = pattrib->hdrlen +
 688                                                 pattrib->iv_len +
 689                                                 ((pattrib->nr_frags == 1) ?
 690                                                 llc_sz : 0) +
 691                                                 ((pattrib->bswenc) ?
 692                                                 pattrib->icv_len : 0) + mem_sz;
 693                         ClearMFrag(mem_start);
 694                         break;
 695                 }
 696                 addr = (addr_t)(pframe);
 697                 mem_start = (unsigned char *)RND4(addr) + TXDESC_OFFSET;
 698                 memcpy(mem_start, pbuf_start + TXDESC_OFFSET, pattrib->hdrlen);
 699         }
 700
 701         if (xmitframe_addmic(padapter, pxmitframe) == _FAIL)
 702                 return _FAIL;
 703         xmitframe_swencrypt(padapter, pxmitframe);
 704         return _SUCCESS;
 705 }
 706
 707 void r8712_update_protection(struct _adapter *padapter, u8 *ie, uint ie_len)
 708 {
 709         uint    protection;
 710         u8      *perp;
 711         sint     erp_len;
 712         struct  xmit_priv *pxmitpriv = &padapter->xmitpriv;
 713         struct  registry_priv *pregistrypriv = &padapter->registrypriv;
 714
 715         switch (pxmitpriv->vcs_setting) {
 716         case DISABLE_VCS:
 717                 pxmitpriv->vcs = NONE_VCS;
 718                 break;
 719         case ENABLE_VCS:
 720                 break;
 721         case AUTO_VCS:
 722         default:
 723                 perp = r8712_get_ie(ie, _ERPINFO_IE_, &erp_len, ie_len);
 724                 if (perp == NULL) {
 725                         pxmitpriv->vcs = NONE_VCS;
 726                 } else {
 727                         protection = (*(perp + 2)) & BIT(1);
 728                         if (protection) {
 729                                 if (pregistrypriv->vcs_type == RTS_CTS)
 730                                         pxmitpriv->vcs = RTS_CTS;
 731                                 else
 732                                         pxmitpriv->vcs = CTS_TO_SELF;
 733                         } else {
 734                                 pxmitpriv->vcs = NONE_VCS;
 735                         }
 736                 }
 737                 break;
 738         }
 739 }
 740
 741 struct xmit_buf *r8712_alloc_xmitbuf(struct xmit_priv *pxmitpriv)
 742 {
 743         unsigned long irqL;
 744         struct xmit_buf *pxmitbuf =  NULL;
 745         struct list_head *plist, *phead;
 746         struct  __queue *pfree_xmitbuf_queue = &pxmitpriv->free_xmitbuf_queue;
 747
 748         spin_lock_irqsave(&pfree_xmitbuf_queue->lock, irqL);
 749         if (list_empty(&pfree_xmitbuf_queue->queue)) {
 750                 pxmitbuf = NULL;
 751         } else {
 752                 phead = &pfree_xmitbuf_queue->queue;
 753                 plist = phead->next;
 754                 pxmitbuf = LIST_CONTAINOR(plist, struct xmit_buf, list);
 755                 list_del_init(&(pxmitbuf->list));
 756         }
 757         if (pxmitbuf !=  NULL)
 758                 pxmitpriv->free_xmitbuf_cnt--;
 759         spin_unlock_irqrestore(&pfree_xmitbuf_queue->lock, irqL);
 760         return pxmitbuf;
 761 }
 762
 763 int r8712_free_xmitbuf(struct xmit_priv *pxmitpriv, struct xmit_buf *pxmitbuf)
 764 {
 765         unsigned long irqL;
 766         struct  __queue *pfree_xmitbuf_queue = &pxmitpriv->free_xmitbuf_queue;
 767
 768         if (pxmitbuf == NULL)
 769                 return _FAIL;
 770         spin_lock_irqsave(&pfree_xmitbuf_queue->lock, irqL);
 771         list_del_init(&pxmitbuf->list);
 772         list_add_tail(&(pxmitbuf->list), &pfree_xmitbuf_queue->queue);
 773         pxmitpriv->free_xmitbuf_cnt++;
 774         spin_unlock_irqrestore(&pfree_xmitbuf_queue->lock, irqL);
 775         return _SUCCESS;
 776 }
 777
 778 /*
 779 Calling context:
 780 1. OS_TXENTRY
 781 2. RXENTRY (rx_thread or RX_ISR/RX_CallBack)
 782
 783 If we turn on USE_RXTHREAD, then, no need for critical section.
 784 Otherwise, we must use _enter/_exit critical to protect free_xmit_queue...
 785
 786 Must be very very cautious...
 787
 788 */
 789
 790 struct xmit_frame *r8712_alloc_xmitframe(struct xmit_priv *pxmitpriv)
 791 {
 792         /*
 793                 Please remember to use all the osdep_service api,
 794                 and lock/unlock or _enter/_exit critical to protect
 795                 pfree_xmit_queue
 796         */
 797         unsigned long irqL;
 798         struct xmit_frame *pxframe = NULL;
 799         struct list_head *plist, *phead;
 800         struct  __queue *pfree_xmit_queue = &pxmitpriv->free_xmit_queue;
 801
 802         spin_lock_irqsave(&pfree_xmit_queue->lock, irqL);
 803         if (list_empty(&pfree_xmit_queue->queue)) {
 804                 pxframe =  NULL;
 805         } else {
 806                 phead = &pfree_xmit_queue->queue;
 807                 plist = phead->next;
 808                 pxframe = LIST_CONTAINOR(plist, struct xmit_frame, list);
 809                 list_del_init(&(pxframe->list));
 810         }
 811         if (pxframe !=  NULL) {
 812                 pxmitpriv->free_xmitframe_cnt--;
 813                 pxframe->buf_addr = NULL;
 814                 pxframe->pxmitbuf = NULL;
 815                 pxframe->attrib.psta = NULL;
 816                 pxframe->pkt = NULL;
 817         }
 818         spin_unlock_irqrestore(&pfree_xmit_queue->lock, irqL);
 819         return pxframe;
 820 }
 821
 822 void r8712_free_xmitframe(struct xmit_priv *pxmitpriv,
 823                           struct xmit_frame *pxmitframe)
 824 {
 825         unsigned long irqL;
 826         struct  __queue *pfree_xmit_queue = &pxmitpriv->free_xmit_queue;
 827         struct _adapter *padapter = pxmitpriv->adapter;
 828
 829         if (pxmitframe == NULL)
 830                 return;
 831         spin_lock_irqsave(&pfree_xmit_queue->lock, irqL);
 832         list_del_init(&pxmitframe->list);
 833         if (pxmitframe->pkt)
 834                 pxmitframe->pkt = NULL;
 835         list_add_tail(&pxmitframe->list, &pfree_xmit_queue->queue);
 836         pxmitpriv->free_xmitframe_cnt++;
 837         spin_unlock_irqrestore(&pfree_xmit_queue->lock, irqL);
 838         if (netif_queue_stopped(padapter->pnetdev))
 839                 netif_wake_queue(padapter->pnetdev);
 840 }
 841
 842 void r8712_free_xmitframe_ex(struct xmit_priv *pxmitpriv,
 843                       struct xmit_frame *pxmitframe)
 844 {
 845         if (pxmitframe == NULL)
 846                 return;
 847         if (pxmitframe->frame_tag == DATA_FRAMETAG)
 848                 r8712_free_xmitframe(pxmitpriv, pxmitframe);
 849 }
 850
 851 void r8712_free_xmitframe_queue(struct xmit_priv *pxmitpriv,
 852                                 struct  __queue *pframequeue)
 853 {
 854         unsigned long irqL;
 855         struct list_head *plist, *phead;
 856         struct  xmit_frame      *pxmitframe;
 857
 858         spin_lock_irqsave(&(pframequeue->lock), irqL);
 859         phead = &pframequeue->queue;
 860         plist = phead->next;
 861         while (!end_of_queue_search(phead, plist)) {
 862                 pxmitframe = LIST_CONTAINOR(plist, struct xmit_frame, list);
 863                 plist = plist->next;
 864                 r8712_free_xmitframe(pxmitpriv, pxmitframe);
 865         }
 866         spin_unlock_irqrestore(&(pframequeue->lock), irqL);
 867 }
 868
 869 static inline struct tx_servq *get_sta_pending(struct _adapter *padapter,
 870                                                struct  __queue **ppstapending,
 871                                                struct sta_info *psta, sint up)
 872 {
 873
 874         struct tx_servq *ptxservq;
 875         struct hw_xmit *phwxmits =  padapter->xmitpriv.hwxmits;
 876
 877         switch (up) {
 878         case 1:
 879         case 2:
 880                 ptxservq = &(psta->sta_xmitpriv.bk_q);
 881                 *ppstapending = &padapter->xmitpriv.bk_pending;
 882                 (phwxmits + 3)->accnt++;
 883                 break;
 884         case 4:
 885         case 5:
 886                 ptxservq = &(psta->sta_xmitpriv.vi_q);
 887                 *ppstapending = &padapter->xmitpriv.vi_pending;
 888                 (phwxmits + 1)->accnt++;
 889                 break;
 890         case 6:
 891         case 7:
 892                 ptxservq = &(psta->sta_xmitpriv.vo_q);
 893                 *ppstapending = &padapter->xmitpriv.vo_pending;
 894                 (phwxmits + 0)->accnt++;
 895                 break;
 896         case 0:
 897         case 3:
 898         default:
 899                 ptxservq = &(psta->sta_xmitpriv.be_q);
 900                 *ppstapending = &padapter->xmitpriv.be_pending;
 901                 (phwxmits + 2)->accnt++;
 902                 break;
 903         }
 904         return ptxservq;
 905 }
 906
 907 /*
 908  * Will enqueue pxmitframe to the proper queue, and indicate it
 909  * to xx_pending list.....
 910  */
 911 sint r8712_xmit_classifier(struct _adapter *padapter,
 912                            struct xmit_frame *pxmitframe)
 913 {
 914         unsigned long irqL0;
 915         struct  __queue *pstapending;
 916         struct sta_info *psta;
 917         struct tx_servq *ptxservq;
 918         struct pkt_attrib *pattrib = &pxmitframe->attrib;
 919         struct sta_priv *pstapriv = &padapter->stapriv;
 920         struct mlme_priv *pmlmepriv = &padapter->mlmepriv;
 921         sint bmcst = IS_MCAST(pattrib->ra);
 922
 923         if (pattrib->psta) {
 924                 psta = pattrib->psta;
 925         } else {
 926                 if (bmcst) {
 927                         psta = r8712_get_bcmc_stainfo(padapter);
 928                 } else {
 929                         if (check_fwstate(pmlmepriv, WIFI_MP_STATE))
 930                                 psta = r8712_get_stainfo(pstapriv,
 931                                        get_bssid(pmlmepriv));
 932                         else
 933                                 psta = r8712_get_stainfo(pstapriv, pattrib->ra);
 934                 }
 935         }
 936         if (psta == NULL)
 937                 return _FAIL;
 938         ptxservq = get_sta_pending(padapter, &pstapending,
 939                    psta, pattrib->priority);
 940         spin_lock_irqsave(&pstapending->lock, irqL0);
 941         if (list_empty(&ptxservq->tx_pending))
 942                 list_add_tail(&ptxservq->tx_pending, &pstapending->queue);
 943         list_add_tail(&pxmitframe->list, &ptxservq->sta_pending.queue);
 944         ptxservq->qcnt++;
 945         spin_unlock_irqrestore(&pstapending->lock, irqL0);
 946         return _SUCCESS;
 947 }
 948
 949 static void alloc_hwxmits(struct _adapter *padapter)
 950 {
 951         struct hw_xmit *hwxmits;
 952         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
 953
 954         pxmitpriv->hwxmit_entry = HWXMIT_ENTRY;
 955         pxmitpriv->hwxmits = kmalloc_array(pxmitpriv->hwxmit_entry,
 956                                 sizeof(struct hw_xmit), GFP_ATOMIC);
 957         if (pxmitpriv->hwxmits == NULL)
 958                 return;
 959         hwxmits = pxmitpriv->hwxmits;
 960         if (pxmitpriv->hwxmit_entry == 5) {
 961                 pxmitpriv->bmc_txqueue.head = 0;
 962                 hwxmits[0] .phwtxqueue = &pxmitpriv->bmc_txqueue;
 963                 hwxmits[0] .sta_queue = &pxmitpriv->bm_pending;
 964                 pxmitpriv->vo_txqueue.head = 0;
 965                 hwxmits[1] .phwtxqueue = &pxmitpriv->vo_txqueue;
 966                 hwxmits[1] .sta_queue = &pxmitpriv->vo_pending;
 967         pxmitpriv->vi_txqueue.head = 0;
 968                 hwxmits[2] .phwtxqueue = &pxmitpriv->vi_txqueue;
 969                 hwxmits[2] .sta_queue = &pxmitpriv->vi_pending;
 970                 pxmitpriv->bk_txqueue.head = 0;
 971                 hwxmits[3] .phwtxqueue = &pxmitpriv->bk_txqueue;
 972                 hwxmits[3] .sta_queue = &pxmitpriv->bk_pending;
 973                 pxmitpriv->be_txqueue.head = 0;
 974                 hwxmits[4] .phwtxqueue = &pxmitpriv->be_txqueue;
 975                 hwxmits[4] .sta_queue = &pxmitpriv->be_pending;
 976         } else if (pxmitpriv->hwxmit_entry == 4) {
 977                 pxmitpriv->vo_txqueue.head = 0;
 978                 hwxmits[0] .phwtxqueue = &pxmitpriv->vo_txqueue;
 979                 hwxmits[0] .sta_queue = &pxmitpriv->vo_pending;
 980                 pxmitpriv->vi_txqueue.head = 0;
 981                 hwxmits[1] .phwtxqueue = &pxmitpriv->vi_txqueue;
 982                 hwxmits[1] .sta_queue = &pxmitpriv->vi_pending;
 983                 pxmitpriv->be_txqueue.head = 0;
 984                 hwxmits[2] .phwtxqueue = &pxmitpriv->be_txqueue;
 985                 hwxmits[2] .sta_queue = &pxmitpriv->be_pending;
 986                 pxmitpriv->bk_txqueue.head = 0;
 987                 hwxmits[3] .phwtxqueue = &pxmitpriv->bk_txqueue;
 988                 hwxmits[3] .sta_queue = &pxmitpriv->bk_pending;
 989         }
 990 }
 991
 992 static void free_hwxmits(struct _adapter *padapter)
 993 {
 994         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
 995
 996         kfree(pxmitpriv->hwxmits);
 997 }
 998
 999 static void init_hwxmits(struct hw_xmit *phwxmit, sint entry)
1000 {
1001         sint i;
1002
1003         for (i = 0; i < entry; i++, phwxmit++) {
1004                 spin_lock_init(&phwxmit->xmit_lock);
1005                 INIT_LIST_HEAD(&phwxmit->pending);
1006                 phwxmit->txcmdcnt = 0;
1007                 phwxmit->accnt = 0;
1008         }
1009 }
1010
1011 void xmitframe_xmitbuf_attach(struct xmit_frame *pxmitframe,
1012                         struct xmit_buf *pxmitbuf)
1013 {
1014         /* pxmitbuf attach to pxmitframe */
1015         pxmitframe->pxmitbuf = pxmitbuf;
1016         /* urb and irp connection */
1017         pxmitframe->pxmit_urb[0] = pxmitbuf->pxmit_urb[0];
1018         /* buffer addr assoc */
1019         pxmitframe->buf_addr = pxmitbuf->pbuf;
1020         /* pxmitframe attach to pxmitbuf */
1021         pxmitbuf->priv_data = pxmitframe;
1022 }
1023
1024 /*
1025  * tx_action == 0 == no frames to transmit
1026  * tx_action > 0 ==> we have frames to transmit
1027  * tx_action < 0 ==> we have frames to transmit, but TXFF is not even enough
1028  *                                               to transmit 1 frame.
1029  */
1030
1031 int r8712_pre_xmit(struct _adapter *padapter, struct xmit_frame *pxmitframe)
1032 {
1033         unsigned long irqL;
1034         int ret;
1035         struct xmit_buf *pxmitbuf = NULL;
1036         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
1037         struct pkt_attrib *pattrib = &pxmitframe->attrib;
1038
1039         r8712_do_queue_select(padapter, pattrib);
1040         spin_lock_irqsave(&pxmitpriv->lock, irqL);
1041         if (r8712_txframes_sta_ac_pending(padapter, pattrib) > 0) {
1042                 ret = false;
1043                 r8712_xmit_enqueue(padapter, pxmitframe);
1044                 spin_unlock_irqrestore(&pxmitpriv->lock, irqL);
1045                 return ret;
1046         }
1047         pxmitbuf = r8712_alloc_xmitbuf(pxmitpriv);
1048         if (pxmitbuf == NULL) { /*enqueue packet*/
1049                 ret = false;
1050                 r8712_xmit_enqueue(padapter, pxmitframe);
1051                 spin_unlock_irqrestore(&pxmitpriv->lock, irqL);
1052         } else { /*dump packet directly*/
1053                 spin_unlock_irqrestore(&pxmitpriv->lock, irqL);
1054                 ret = true;
1055                 xmitframe_xmitbuf_attach(pxmitframe, pxmitbuf);
1056                 r8712_xmit_direct(padapter, pxmitframe);
1057         }
1058         return ret;
1059 }