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 =
 343                     (le32_to_cpu(txdesc.txdw1) >> QSEL_SHT) & 0x1f;
 344         return _SUCCESS;
 345 }
 346
 347 static sint xmitframe_addmic(struct _adapter *padapter,
 348                              struct xmit_frame *pxmitframe)
 349 {
 350         u32     curfragnum, length;
 351         u8      *pframe, *payload, mic[8];
 352         struct  mic_data micdata;
 353         struct  sta_info *stainfo;
 354         struct  qos_priv *pqospriv = &(padapter->mlmepriv.qospriv);
 355         struct  pkt_attrib  *pattrib = &pxmitframe->attrib;
 356         struct  security_priv *psecuritypriv = &padapter->securitypriv;
 357         struct  xmit_priv *pxmitpriv = &padapter->xmitpriv;
 358         u8 priority[4] = {0x0, 0x0, 0x0, 0x0};
 359         sint bmcst = IS_MCAST(pattrib->ra);
 360
 361         if (pattrib->psta)
 362                 stainfo = pattrib->psta;
 363         else
 364                 stainfo = r8712_get_stainfo(&padapter->stapriv,
 365                                             &pattrib->ra[0]);
 366         if (pattrib->encrypt == _TKIP_) {
 367                 /*encode mic code*/
 368                 if (stainfo != NULL) {
 369                         u8 null_key[16] = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
 370                                            0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
 371                                            0x0, 0x0};
 372                         pframe = pxmitframe->buf_addr + TXDESC_OFFSET;
 373                         if (bmcst) {
 374                                 if (!memcmp(psecuritypriv->XGrptxmickey
 375                                    [psecuritypriv->XGrpKeyid].skey,
 376                                    null_key, 16))
 377                                         return _FAIL;
 378                                 /*start to calculate the mic code*/
 379                                 r8712_secmicsetkey(&micdata,
 380                                          psecuritypriv->
 381                                          XGrptxmickey[psecuritypriv->
 382                                         XGrpKeyid].skey);
 383                         } else {
 384                                 if (!memcmp(&stainfo->tkiptxmickey.skey[0],
 385                                             null_key, 16))
 386                                         return _FAIL;
 387                                 /* start to calculate the mic code */
 388                                 r8712_secmicsetkey(&micdata,
 389                                              &stainfo->tkiptxmickey.skey[0]);
 390                         }
 391                         if (pframe[1] & 1) {   /* ToDS==1 */
 392                                 r8712_secmicappend(&micdata,
 393                                                    &pframe[16], 6); /*DA*/
 394                                 if (pframe[1] & 2)  /* From Ds==1 */
 395                                         r8712_secmicappend(&micdata,
 396                                                            &pframe[24], 6);
 397                                 else
 398                                         r8712_secmicappend(&micdata,
 399                                                            &pframe[10], 6);
 400                         } else {        /* ToDS==0 */
 401                                 r8712_secmicappend(&micdata,
 402                                                    &pframe[4], 6); /* DA */
 403                                 if (pframe[1] & 2)  /* From Ds==1 */
 404                                         r8712_secmicappend(&micdata,
 405                                                            &pframe[16], 6);
 406                                 else
 407                                         r8712_secmicappend(&micdata,
 408                                                            &pframe[10], 6);
 409                         }
 410                         if (pqospriv->qos_option == 1)
 411                                         priority[0] = (u8)pxmitframe->
 412                                                       attrib.priority;
 413                         r8712_secmicappend(&micdata, &priority[0], 4);
 414                         payload = pframe;
 415                         for (curfragnum = 0; curfragnum < pattrib->nr_frags;
 416                              curfragnum++) {
 417                                 payload = (u8 *)RND4((addr_t)(payload));
 418                                 payload = payload + pattrib->
 419                                           hdrlen + pattrib->iv_len;
 420                                 if ((curfragnum + 1) == pattrib->nr_frags) {
 421                                         length = pattrib->last_txcmdsz -
 422                                                   pattrib->hdrlen -
 423                                                   pattrib->iv_len -
 424                                                   ((psecuritypriv->sw_encrypt)
 425                                                   ? pattrib->icv_len : 0);
 426                                         r8712_secmicappend(&micdata, payload,
 427                                                            length);
 428                                         payload = payload + length;
 429                                 } else{
 430                                         length = pxmitpriv->frag_len -
 431                                             pattrib->hdrlen - pattrib->iv_len -
 432                                             ((psecuritypriv->sw_encrypt) ?
 433                                             pattrib->icv_len : 0);
 434                                         r8712_secmicappend(&micdata, payload,
 435                                                            length);
 436                                         payload = payload + length +
 437                                                   pattrib->icv_len;
 438                                 }
 439                         }
 440                         r8712_secgetmic(&micdata, &(mic[0]));
 441                         /* add mic code  and add the mic code length in
 442                          * last_txcmdsz */
 443                         memcpy(payload, &(mic[0]), 8);
 444                         pattrib->last_txcmdsz += 8;
 445                         payload = payload - pattrib->last_txcmdsz + 8;
 446                 }
 447         }
 448         return _SUCCESS;
 449 }
 450
 451 static sint xmitframe_swencrypt(struct _adapter *padapter,
 452                                 struct xmit_frame *pxmitframe)
 453 {
 454         struct pkt_attrib       *pattrib = &pxmitframe->attrib;
 455
 456         if (pattrib->bswenc) {
 457                 switch (pattrib->encrypt) {
 458                 case _WEP40_:
 459                 case _WEP104_:
 460                         r8712_wep_encrypt(padapter, (u8 *)pxmitframe);
 461                         break;
 462                 case _TKIP_:
 463                         r8712_tkip_encrypt(padapter, (u8 *)pxmitframe);
 464                         break;
 465                 case _AES_:
 466                         r8712_aes_encrypt(padapter, (u8 *)pxmitframe);
 467                         break;
 468                 default:
 469                                 break;
 470                 }
 471         }
 472         return _SUCCESS;
 473 }
 474
 475 static sint make_wlanhdr(struct _adapter *padapter, u8 *hdr,
 476                          struct pkt_attrib *pattrib)
 477 {
 478         u16 *qc;
 479
 480         struct ieee80211_hdr *pwlanhdr = (struct ieee80211_hdr *)hdr;
 481         struct mlme_priv *pmlmepriv = &padapter->mlmepriv;
 482         struct qos_priv *pqospriv = &pmlmepriv->qospriv;
 483         __le16 *fctrl = &pwlanhdr->frame_ctl;
 484
 485         memset(hdr, 0, WLANHDR_OFFSET);
 486         SetFrameSubType(fctrl, pattrib->subtype);
 487         if (pattrib->subtype & WIFI_DATA_TYPE) {
 488                 if (check_fwstate(pmlmepriv,  WIFI_STATION_STATE)) {
 489                         /* to_ds = 1, fr_ds = 0; */
 490                         SetToDs(fctrl);
 491                         memcpy(pwlanhdr->addr1, get_bssid(pmlmepriv),
 492                                 ETH_ALEN);
 493                         memcpy(pwlanhdr->addr2, pattrib->src, ETH_ALEN);
 494                         memcpy(pwlanhdr->addr3, pattrib->dst, ETH_ALEN);
 495                 } else if (check_fwstate(pmlmepriv, WIFI_AP_STATE)) {
 496                         /* to_ds = 0, fr_ds = 1; */
 497                         SetFrDs(fctrl);
 498                         memcpy(pwlanhdr->addr1, pattrib->dst, ETH_ALEN);
 499                         memcpy(pwlanhdr->addr2, get_bssid(pmlmepriv),
 500                                 ETH_ALEN);
 501                         memcpy(pwlanhdr->addr3, pattrib->src, ETH_ALEN);
 502                 } else if (check_fwstate(pmlmepriv, WIFI_ADHOC_STATE) ||
 503                            check_fwstate(pmlmepriv,
 504                                          WIFI_ADHOC_MASTER_STATE)) {
 505                         memcpy(pwlanhdr->addr1, pattrib->dst, ETH_ALEN);
 506                         memcpy(pwlanhdr->addr2, pattrib->src, ETH_ALEN);
 507                         memcpy(pwlanhdr->addr3, get_bssid(pmlmepriv),
 508                                 ETH_ALEN);
 509                 } else if (check_fwstate(pmlmepriv, WIFI_MP_STATE)) {
 510                         memcpy(pwlanhdr->addr1, pattrib->dst, ETH_ALEN);
 511                         memcpy(pwlanhdr->addr2, pattrib->src, ETH_ALEN);
 512                         memcpy(pwlanhdr->addr3, get_bssid(pmlmepriv),
 513                                 ETH_ALEN);
 514                 } else {
 515                         return _FAIL;
 516                 }
 517
 518                 if (pattrib->encrypt)
 519                         SetPrivacy(fctrl);
 520                 if (pqospriv->qos_option) {
 521                         qc = (unsigned short *)(hdr + pattrib->hdrlen - 2);
 522                         if (pattrib->priority)
 523                                 SetPriority(qc, pattrib->priority);
 524                         SetAckpolicy(qc, pattrib->ack_policy);
 525                 }
 526                 /* TODO: fill HT Control Field */
 527                 /* Update Seq Num will be handled by f/w */
 528                 {
 529                         struct sta_info *psta;
 530                         sint bmcst = IS_MCAST(pattrib->ra);
 531
 532                         if (pattrib->psta) {
 533                                 psta = pattrib->psta;
 534                         } else {
 535                                 if (bmcst)
 536                                         psta = r8712_get_bcmc_stainfo(padapter);
 537                                 else
 538                                         psta =
 539                                          r8712_get_stainfo(&padapter->stapriv,
 540                                          pattrib->ra);
 541                         }
 542                         if (psta) {
 543                                 psta->sta_xmitpriv.txseq_tid
 544                                                   [pattrib->priority]++;
 545                                 psta->sta_xmitpriv.txseq_tid[pattrib->priority]
 546                                                    &= 0xFFF;
 547                                 pattrib->seqnum = psta->sta_xmitpriv.
 548                                                   txseq_tid[pattrib->priority];
 549                                 SetSeqNum(hdr, pattrib->seqnum);
 550                         }
 551                 }
 552         }
 553         return _SUCCESS;
 554 }
 555
 556 static sint r8712_put_snap(u8 *data, u16 h_proto)
 557 {
 558         struct ieee80211_snap_hdr *snap;
 559         const u8 *oui;
 560
 561         snap = (struct ieee80211_snap_hdr *)data;
 562         snap->dsap = 0xaa;
 563         snap->ssap = 0xaa;
 564         snap->ctrl = 0x03;
 565         if (h_proto == 0x8137 || h_proto == 0x80f3)
 566                 oui = P802_1H_OUI;
 567         else
 568                 oui = RFC1042_OUI;
 569         snap->oui[0] = oui[0];
 570         snap->oui[1] = oui[1];
 571         snap->oui[2] = oui[2];
 572         *(__be16 *)(data + SNAP_SIZE) = htons(h_proto);
 573         return SNAP_SIZE + sizeof(u16);
 574 }
 575
 576 /*
 577  * This sub-routine will perform all the following:
 578  * 1. remove 802.3 header.
 579  * 2. create wlan_header, based on the info in pxmitframe
 580  * 3. append sta's iv/ext-iv
 581  * 4. append LLC
 582  * 5. move frag chunk from pframe to pxmitframe->mem
 583  * 6. apply sw-encrypt, if necessary.
 584  */
 585 sint r8712_xmitframe_coalesce(struct _adapter *padapter, _pkt *pkt,
 586                         struct xmit_frame *pxmitframe)
 587 {
 588         struct pkt_file pktfile;
 589
 590         sint    frg_len, mpdu_len, llc_sz;
 591         u32     mem_sz;
 592         u8      frg_inx;
 593         addr_t addr;
 594         u8 *pframe, *mem_start, *ptxdesc;
 595         struct sta_info         *psta;
 596         struct security_priv    *psecuritypriv = &padapter->securitypriv;
 597         struct mlme_priv        *pmlmepriv = &padapter->mlmepriv;
 598         struct xmit_priv        *pxmitpriv = &padapter->xmitpriv;
 599         struct pkt_attrib       *pattrib = &pxmitframe->attrib;
 600         u8 *pbuf_start;
 601         sint bmcst = IS_MCAST(pattrib->ra);
 602
 603         if (pattrib->psta == NULL)
 604                 return _FAIL;
 605         psta = pattrib->psta;
 606         if (pxmitframe->buf_addr == NULL)
 607                 return _FAIL;
 608         pbuf_start = pxmitframe->buf_addr;
 609         ptxdesc = pbuf_start;
 610         mem_start = pbuf_start + TXDESC_OFFSET;
 611         if (make_wlanhdr(padapter, mem_start, pattrib) == _FAIL)
 612                 return _FAIL;
 613         _r8712_open_pktfile(pkt, &pktfile);
 614         _r8712_pktfile_read(&pktfile, NULL, (uint) pattrib->pkt_hdrlen);
 615         if (check_fwstate(pmlmepriv, WIFI_MP_STATE)) {
 616                 /* truncate TXDESC_SIZE bytes txcmd if at mp mode for 871x */
 617                 if (pattrib->ether_type == 0x8712) {
 618                         /* take care -  update_txdesc overwrite this */
 619                         _r8712_pktfile_read(&pktfile, ptxdesc, TXDESC_SIZE);
 620                 }
 621         }
 622         pattrib->pktlen = pktfile.pkt_len;
 623         frg_inx = 0;
 624         frg_len = pxmitpriv->frag_len - 4;
 625         while (1) {
 626                 llc_sz = 0;
 627                 mpdu_len = frg_len;
 628                 pframe = mem_start;
 629                 SetMFrag(mem_start);
 630                 pframe += pattrib->hdrlen;
 631                 mpdu_len -= pattrib->hdrlen;
 632                 /* adding icv, if necessary...*/
 633                 if (pattrib->iv_len) {
 634                         if (psta != NULL) {
 635                                 switch (pattrib->encrypt) {
 636                                 case _WEP40_:
 637                                 case _WEP104_:
 638                                         WEP_IV(pattrib->iv, psta->txpn,
 639                                                (u8)psecuritypriv->
 640                                                PrivacyKeyIndex);
 641                                         break;
 642                                 case _TKIP_:
 643                                         if (bmcst)
 644                                                 TKIP_IV(pattrib->iv,
 645                                                     psta->txpn,
 646                                                     (u8)psecuritypriv->
 647                                                     XGrpKeyid);
 648                                         else
 649                                                 TKIP_IV(pattrib->iv, psta->txpn,
 650                                                         0);
 651                                         break;
 652                                 case _AES_:
 653                                         if (bmcst)
 654                                                 AES_IV(pattrib->iv, psta->txpn,
 655                                                     (u8)psecuritypriv->
 656                                                     XGrpKeyid);
 657                                         else
 658                                                 AES_IV(pattrib->iv, psta->txpn,
 659                                                        0);
 660                                         break;
 661                                 }
 662                         }
 663                         memcpy(pframe, pattrib->iv, pattrib->iv_len);
 664                         pframe += pattrib->iv_len;
 665                         mpdu_len -= pattrib->iv_len;
 666                 }
 667                 if (frg_inx == 0) {
 668                         llc_sz = r8712_put_snap(pframe, pattrib->ether_type);
 669                         pframe += llc_sz;
 670                         mpdu_len -= llc_sz;
 671                 }
 672                 if ((pattrib->icv_len > 0) && (pattrib->bswenc))
 673                         mpdu_len -= pattrib->icv_len;
 674                 if (bmcst)
 675                         mem_sz = _r8712_pktfile_read(&pktfile, pframe,
 676                                  pattrib->pktlen);
 677                 else
 678                         mem_sz = _r8712_pktfile_read(&pktfile, pframe,
 679                                  mpdu_len);
 680                 pframe += mem_sz;
 681                 if ((pattrib->icv_len > 0) && (pattrib->bswenc)) {
 682                         memcpy(pframe, pattrib->icv, pattrib->icv_len);
 683                         pframe += pattrib->icv_len;
 684                 }
 685                 frg_inx++;
 686                 if (bmcst || r8712_endofpktfile(&pktfile)) {
 687                         pattrib->nr_frags = frg_inx;
 688                         pattrib->last_txcmdsz = pattrib->hdrlen +
 689                                                 pattrib->iv_len +
 690                                                 ((pattrib->nr_frags == 1) ?
 691                                                 llc_sz : 0) +
 692                                                 ((pattrib->bswenc) ?
 693                                                 pattrib->icv_len : 0) + mem_sz;
 694                         ClearMFrag(mem_start);
 695                         break;
 696                 }
 697                 addr = (addr_t)(pframe);
 698                 mem_start = (unsigned char *)RND4(addr) + TXDESC_OFFSET;
 699                 memcpy(mem_start, pbuf_start + TXDESC_OFFSET, pattrib->hdrlen);
 700         }
 701
 702         if (xmitframe_addmic(padapter, pxmitframe) == _FAIL)
 703                 return _FAIL;
 704         xmitframe_swencrypt(padapter, pxmitframe);
 705         return _SUCCESS;
 706 }
 707
 708 void r8712_update_protection(struct _adapter *padapter, u8 *ie, uint ie_len)
 709 {
 710         uint    protection;
 711         u8      *perp;
 712         sint     erp_len;
 713         struct  xmit_priv *pxmitpriv = &padapter->xmitpriv;
 714         struct  registry_priv *pregistrypriv = &padapter->registrypriv;
 715
 716         switch (pxmitpriv->vcs_setting) {
 717         case DISABLE_VCS:
 718                 pxmitpriv->vcs = NONE_VCS;
 719                 break;
 720         case ENABLE_VCS:
 721                 break;
 722         case AUTO_VCS:
 723         default:
 724                 perp = r8712_get_ie(ie, _ERPINFO_IE_, &erp_len, ie_len);
 725                 if (perp == NULL) {
 726                         pxmitpriv->vcs = NONE_VCS;
 727                 } else {
 728                         protection = (*(perp + 2)) & BIT(1);
 729                         if (protection) {
 730                                 if (pregistrypriv->vcs_type == RTS_CTS)
 731                                         pxmitpriv->vcs = RTS_CTS;
 732                                 else
 733                                         pxmitpriv->vcs = CTS_TO_SELF;
 734                         } else {
 735                                 pxmitpriv->vcs = NONE_VCS;
 736                         }
 737                 }
 738                 break;
 739         }
 740 }
 741
 742 struct xmit_buf *r8712_alloc_xmitbuf(struct xmit_priv *pxmitpriv)
 743 {
 744         unsigned long irqL;
 745         struct xmit_buf *pxmitbuf =  NULL;
 746         struct list_head *plist, *phead;
 747         struct  __queue *pfree_xmitbuf_queue = &pxmitpriv->free_xmitbuf_queue;
 748
 749         spin_lock_irqsave(&pfree_xmitbuf_queue->lock, irqL);
 750         if (list_empty(&pfree_xmitbuf_queue->queue)) {
 751                 pxmitbuf = NULL;
 752         } else {
 753                 phead = &pfree_xmitbuf_queue->queue;
 754                 plist = phead->next;
 755                 pxmitbuf = LIST_CONTAINOR(plist, struct xmit_buf, list);
 756                 list_del_init(&(pxmitbuf->list));
 757         }
 758         if (pxmitbuf !=  NULL)
 759                 pxmitpriv->free_xmitbuf_cnt--;
 760         spin_unlock_irqrestore(&pfree_xmitbuf_queue->lock, irqL);
 761         return pxmitbuf;
 762 }
 763
 764 int r8712_free_xmitbuf(struct xmit_priv *pxmitpriv, struct xmit_buf *pxmitbuf)
 765 {
 766         unsigned long irqL;
 767         struct  __queue *pfree_xmitbuf_queue = &pxmitpriv->free_xmitbuf_queue;
 768
 769         if (pxmitbuf == NULL)
 770                 return _FAIL;
 771         spin_lock_irqsave(&pfree_xmitbuf_queue->lock, irqL);
 772         list_del_init(&pxmitbuf->list);
 773         list_add_tail(&(pxmitbuf->list), &pfree_xmitbuf_queue->queue);
 774         pxmitpriv->free_xmitbuf_cnt++;
 775         spin_unlock_irqrestore(&pfree_xmitbuf_queue->lock, irqL);
 776         return _SUCCESS;
 777 }
 778
 779 /*
 780 Calling context:
 781 1. OS_TXENTRY
 782 2. RXENTRY (rx_thread or RX_ISR/RX_CallBack)
 783
 784 If we turn on USE_RXTHREAD, then, no need for critical section.
 785 Otherwise, we must use _enter/_exit critical to protect free_xmit_queue...
 786
 787 Must be very very cautious...
 788
 789 */
 790
 791 struct xmit_frame *r8712_alloc_xmitframe(struct xmit_priv *pxmitpriv)
 792 {
 793         /*
 794                 Please remember to use all the osdep_service api,
 795                 and lock/unlock or _enter/_exit critical to protect
 796                 pfree_xmit_queue
 797         */
 798         unsigned long irqL;
 799         struct xmit_frame *pxframe = NULL;
 800         struct list_head *plist, *phead;
 801         struct  __queue *pfree_xmit_queue = &pxmitpriv->free_xmit_queue;
 802
 803         spin_lock_irqsave(&pfree_xmit_queue->lock, irqL);
 804         if (list_empty(&pfree_xmit_queue->queue)) {
 805                 pxframe =  NULL;
 806         } else {
 807                 phead = &pfree_xmit_queue->queue;
 808                 plist = phead->next;
 809                 pxframe = LIST_CONTAINOR(plist, struct xmit_frame, list);
 810                 list_del_init(&(pxframe->list));
 811         }
 812         if (pxframe !=  NULL) {
 813                 pxmitpriv->free_xmitframe_cnt--;
 814                 pxframe->buf_addr = NULL;
 815                 pxframe->pxmitbuf = NULL;
 816                 pxframe->attrib.psta = NULL;
 817                 pxframe->pkt = NULL;
 818         }
 819         spin_unlock_irqrestore(&pfree_xmit_queue->lock, irqL);
 820         return pxframe;
 821 }
 822
 823 void r8712_free_xmitframe(struct xmit_priv *pxmitpriv,
 824                           struct xmit_frame *pxmitframe)
 825 {
 826         unsigned long irqL;
 827         struct  __queue *pfree_xmit_queue = &pxmitpriv->free_xmit_queue;
 828         struct _adapter *padapter = pxmitpriv->adapter;
 829
 830         if (pxmitframe == NULL)
 831                 return;
 832         spin_lock_irqsave(&pfree_xmit_queue->lock, irqL);
 833         list_del_init(&pxmitframe->list);
 834         if (pxmitframe->pkt)
 835                 pxmitframe->pkt = NULL;
 836         list_add_tail(&pxmitframe->list, &pfree_xmit_queue->queue);
 837         pxmitpriv->free_xmitframe_cnt++;
 838         spin_unlock_irqrestore(&pfree_xmit_queue->lock, irqL);
 839         if (netif_queue_stopped(padapter->pnetdev))
 840                 netif_wake_queue(padapter->pnetdev);
 841 }
 842
 843 void r8712_free_xmitframe_ex(struct xmit_priv *pxmitpriv,
 844                       struct xmit_frame *pxmitframe)
 845 {
 846         if (pxmitframe == NULL)
 847                 return;
 848         if (pxmitframe->frame_tag == DATA_FRAMETAG)
 849                 r8712_free_xmitframe(pxmitpriv, pxmitframe);
 850 }
 851
 852 void r8712_free_xmitframe_queue(struct xmit_priv *pxmitpriv,
 853                                 struct  __queue *pframequeue)
 854 {
 855         unsigned long irqL;
 856         struct list_head *plist, *phead;
 857         struct  xmit_frame      *pxmitframe;
 858
 859         spin_lock_irqsave(&(pframequeue->lock), irqL);
 860         phead = &pframequeue->queue;
 861         plist = phead->next;
 862         while (!end_of_queue_search(phead, plist)) {
 863                 pxmitframe = LIST_CONTAINOR(plist, struct xmit_frame, list);
 864                 plist = plist->next;
 865                 r8712_free_xmitframe(pxmitpriv, pxmitframe);
 866         }
 867         spin_unlock_irqrestore(&(pframequeue->lock), irqL);
 868 }
 869
 870 static inline struct tx_servq *get_sta_pending(struct _adapter *padapter,
 871                                                struct  __queue **ppstapending,
 872                                                struct sta_info *psta, sint up)
 873 {
 874
 875         struct tx_servq *ptxservq;
 876         struct hw_xmit *phwxmits =  padapter->xmitpriv.hwxmits;
 877
 878         switch (up) {
 879         case 1:
 880         case 2:
 881                 ptxservq = &(psta->sta_xmitpriv.bk_q);
 882                 *ppstapending = &padapter->xmitpriv.bk_pending;
 883                 (phwxmits + 3)->accnt++;
 884                 break;
 885         case 4:
 886         case 5:
 887                 ptxservq = &(psta->sta_xmitpriv.vi_q);
 888                 *ppstapending = &padapter->xmitpriv.vi_pending;
 889                 (phwxmits + 1)->accnt++;
 890                 break;
 891         case 6:
 892         case 7:
 893                 ptxservq = &(psta->sta_xmitpriv.vo_q);
 894                 *ppstapending = &padapter->xmitpriv.vo_pending;
 895                 (phwxmits + 0)->accnt++;
 896                 break;
 897         case 0:
 898         case 3:
 899         default:
 900                 ptxservq = &(psta->sta_xmitpriv.be_q);
 901                 *ppstapending = &padapter->xmitpriv.be_pending;
 902                 (phwxmits + 2)->accnt++;
 903                 break;
 904         }
 905         return ptxservq;
 906 }
 907
 908 /*
 909  * Will enqueue pxmitframe to the proper queue, and indicate it
 910  * to xx_pending list.....
 911  */
 912 sint r8712_xmit_classifier(struct _adapter *padapter,
 913                            struct xmit_frame *pxmitframe)
 914 {
 915         unsigned long irqL0;
 916         struct  __queue *pstapending;
 917         struct sta_info *psta;
 918         struct tx_servq *ptxservq;
 919         struct pkt_attrib *pattrib = &pxmitframe->attrib;
 920         struct sta_priv *pstapriv = &padapter->stapriv;
 921         struct mlme_priv *pmlmepriv = &padapter->mlmepriv;
 922         sint bmcst = IS_MCAST(pattrib->ra);
 923
 924         if (pattrib->psta) {
 925                 psta = pattrib->psta;
 926         } else {
 927                 if (bmcst) {
 928                         psta = r8712_get_bcmc_stainfo(padapter);
 929                 } else {
 930                         if (check_fwstate(pmlmepriv, WIFI_MP_STATE))
 931                                 psta = r8712_get_stainfo(pstapriv,
 932                                        get_bssid(pmlmepriv));
 933                         else
 934                                 psta = r8712_get_stainfo(pstapriv, pattrib->ra);
 935                 }
 936         }
 937         if (psta == NULL)
 938                 return _FAIL;
 939         ptxservq = get_sta_pending(padapter, &pstapending,
 940                    psta, pattrib->priority);
 941         spin_lock_irqsave(&pstapending->lock, irqL0);
 942         if (list_empty(&ptxservq->tx_pending))
 943                 list_add_tail(&ptxservq->tx_pending, &pstapending->queue);
 944         list_add_tail(&pxmitframe->list, &ptxservq->sta_pending.queue);
 945         ptxservq->qcnt++;
 946         spin_unlock_irqrestore(&pstapending->lock, irqL0);
 947         return _SUCCESS;
 948 }
 949
 950 static void alloc_hwxmits(struct _adapter *padapter)
 951 {
 952         struct hw_xmit *hwxmits;
 953         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
 954
 955         pxmitpriv->hwxmit_entry = HWXMIT_ENTRY;
 956         pxmitpriv->hwxmits = kmalloc_array(pxmitpriv->hwxmit_entry,
 957                                 sizeof(struct hw_xmit), GFP_ATOMIC);
 958         if (pxmitpriv->hwxmits == NULL)
 959                 return;
 960         hwxmits = pxmitpriv->hwxmits;
 961         if (pxmitpriv->hwxmit_entry == 5) {
 962                 pxmitpriv->bmc_txqueue.head = 0;
 963                 hwxmits[0] .phwtxqueue = &pxmitpriv->bmc_txqueue;
 964                 hwxmits[0] .sta_queue = &pxmitpriv->bm_pending;
 965                 pxmitpriv->vo_txqueue.head = 0;
 966                 hwxmits[1] .phwtxqueue = &pxmitpriv->vo_txqueue;
 967                 hwxmits[1] .sta_queue = &pxmitpriv->vo_pending;
 968         pxmitpriv->vi_txqueue.head = 0;
 969                 hwxmits[2] .phwtxqueue = &pxmitpriv->vi_txqueue;
 970                 hwxmits[2] .sta_queue = &pxmitpriv->vi_pending;
 971                 pxmitpriv->bk_txqueue.head = 0;
 972                 hwxmits[3] .phwtxqueue = &pxmitpriv->bk_txqueue;
 973                 hwxmits[3] .sta_queue = &pxmitpriv->bk_pending;
 974                 pxmitpriv->be_txqueue.head = 0;
 975                 hwxmits[4] .phwtxqueue = &pxmitpriv->be_txqueue;
 976                 hwxmits[4] .sta_queue = &pxmitpriv->be_pending;
 977         } else if (pxmitpriv->hwxmit_entry == 4) {
 978                 pxmitpriv->vo_txqueue.head = 0;
 979                 hwxmits[0] .phwtxqueue = &pxmitpriv->vo_txqueue;
 980                 hwxmits[0] .sta_queue = &pxmitpriv->vo_pending;
 981                 pxmitpriv->vi_txqueue.head = 0;
 982                 hwxmits[1] .phwtxqueue = &pxmitpriv->vi_txqueue;
 983                 hwxmits[1] .sta_queue = &pxmitpriv->vi_pending;
 984                 pxmitpriv->be_txqueue.head = 0;
 985                 hwxmits[2] .phwtxqueue = &pxmitpriv->be_txqueue;
 986                 hwxmits[2] .sta_queue = &pxmitpriv->be_pending;
 987                 pxmitpriv->bk_txqueue.head = 0;
 988                 hwxmits[3] .phwtxqueue = &pxmitpriv->bk_txqueue;
 989                 hwxmits[3] .sta_queue = &pxmitpriv->bk_pending;
 990         }
 991 }
 992
 993 static void free_hwxmits(struct _adapter *padapter)
 994 {
 995         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
 996
 997         kfree(pxmitpriv->hwxmits);
 998 }
 999
1000 static void init_hwxmits(struct hw_xmit *phwxmit, sint entry)
1001 {
1002         sint i;
1003
1004         for (i = 0; i < entry; i++, phwxmit++) {
1005                 spin_lock_init(&phwxmit->xmit_lock);
1006                 INIT_LIST_HEAD(&phwxmit->pending);
1007                 phwxmit->txcmdcnt = 0;
1008                 phwxmit->accnt = 0;
1009         }
1010 }
1011
1012 void xmitframe_xmitbuf_attach(struct xmit_frame *pxmitframe,
1013                         struct xmit_buf *pxmitbuf)
1014 {
1015         /* pxmitbuf attach to pxmitframe */
1016         pxmitframe->pxmitbuf = pxmitbuf;
1017         /* urb and irp connection */
1018         pxmitframe->pxmit_urb[0] = pxmitbuf->pxmit_urb[0];
1019         /* buffer addr assoc */
1020         pxmitframe->buf_addr = pxmitbuf->pbuf;
1021         /* pxmitframe attach to pxmitbuf */
1022         pxmitbuf->priv_data = pxmitframe;
1023 }
1024
1025 /*
1026  * tx_action == 0 == no frames to transmit
1027  * tx_action > 0 ==> we have frames to transmit
1028  * tx_action < 0 ==> we have frames to transmit, but TXFF is not even enough
1029  *                                               to transmit 1 frame.
1030  */
1031
1032 int r8712_pre_xmit(struct _adapter *padapter, struct xmit_frame *pxmitframe)
1033 {
1034         unsigned long irqL;
1035         int ret;
1036         struct xmit_buf *pxmitbuf = NULL;
1037         struct xmit_priv *pxmitpriv = &padapter->xmitpriv;
1038         struct pkt_attrib *pattrib = &pxmitframe->attrib;
1039
1040         r8712_do_queue_select(padapter, pattrib);
1041         spin_lock_irqsave(&pxmitpriv->lock, irqL);
1042         if (r8712_txframes_sta_ac_pending(padapter, pattrib) > 0) {
1043                 ret = false;
1044                 r8712_xmit_enqueue(padapter, pxmitframe);
1045                 spin_unlock_irqrestore(&pxmitpriv->lock, irqL);
1046                 return ret;
1047         }
1048         pxmitbuf = r8712_alloc_xmitbuf(pxmitpriv);
1049         if (pxmitbuf == NULL) { /*enqueue packet*/
1050                 ret = false;
1051                 r8712_xmit_enqueue(padapter, pxmitframe);
1052                 spin_unlock_irqrestore(&pxmitpriv->lock, irqL);
1053         } else { /*dump packet directly*/
1054                 spin_unlock_irqrestore(&pxmitpriv->lock, irqL);
1055                 ret = true;
1056                 xmitframe_xmitbuf_attach(pxmitframe, pxmitbuf);
1057                 r8712_xmit_direct(padapter, pxmitframe);
1058         }
1059         return ret;
1060 }