drivers/staging/vt6656/rxtx.c

   1 /*
   2  * Copyright (c) 1996, 2003 VIA Networking Technologies, Inc.
   3  * All rights reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * File: rxtx.c
  20  *
  21  * Purpose: handle WMAC/802.3/802.11 rx & tx functions
  22  *
  23  * Author: Lyndon Chen
  24  *
  25  * Date: May 20, 2003
  26  *
  27  * Functions:
  28  *      vnt_generate_tx_parameter - Generate tx dma required parameter.
  29  *      vnt_get_duration_le - get tx data required duration
  30  *      vnt_get_rtscts_duration_le- get rtx/cts required duration
  31  *      vnt_get_rtscts_rsvtime_le- get rts/cts reserved time
  32  *      vnt_get_rsvtime- get frame reserved time
  33  *      vnt_fill_cts_head- fulfill CTS ctl header
  34  *
  35  * Revision History:
  36  *
  37  */
  38
  39 #include <linux/etherdevice.h>
  40 #include "device.h"
  41 #include "rxtx.h"
  42 #include "card.h"
  43 #include "mac.h"
  44 #include "rf.h"
  45 #include "usbpipe.h"
  46
  47 static const u16 vnt_time_stampoff[2][MAX_RATE] = {
  48         /* Long Preamble */
  49         {384, 288, 226, 209, 54, 43, 37, 31, 28, 25, 24, 23},
  50
  51         /* Short Preamble */
  52         {384, 192, 130, 113, 54, 43, 37, 31, 28, 25, 24, 23},
  53 };
  54
  55 static const u16 vnt_fb_opt0[2][5] = {
  56         {RATE_12M, RATE_18M, RATE_24M, RATE_36M, RATE_48M}, /* fallback_rate0 */
  57         {RATE_12M, RATE_12M, RATE_18M, RATE_24M, RATE_36M}, /* fallback_rate1 */
  58 };
  59
  60 static const u16 vnt_fb_opt1[2][5] = {
  61         {RATE_12M, RATE_18M, RATE_24M, RATE_24M, RATE_36M}, /* fallback_rate0 */
  62         {RATE_6M,  RATE_6M,  RATE_12M, RATE_12M, RATE_18M}, /* fallback_rate1 */
  63 };
  64
  65 #define RTSDUR_BB       0
  66 #define RTSDUR_BA       1
  67 #define RTSDUR_AA       2
  68 #define CTSDUR_BA       3
  69 #define RTSDUR_BA_F0    4
  70 #define RTSDUR_AA_F0    5
  71 #define RTSDUR_BA_F1    6
  72 #define RTSDUR_AA_F1    7
  73 #define CTSDUR_BA_F0    8
  74 #define CTSDUR_BA_F1    9
  75 #define DATADUR_B       10
  76 #define DATADUR_A       11
  77 #define DATADUR_A_F0    12
  78 #define DATADUR_A_F1    13
  79
  80 static struct vnt_usb_send_context
  81         *vnt_get_free_context(struct vnt_private *priv)
  82 {
  83         struct vnt_usb_send_context *context = NULL;
  84         int ii;
  85
  86         dev_dbg(&priv->usb->dev, "%s\n", __func__);
  87
  88         for (ii = 0; ii < priv->num_tx_context; ii++) {
  89                 if (!priv->tx_context[ii])
  90                         return NULL;
  91
  92                 context = priv->tx_context[ii];
  93                 if (!context->in_use) {
  94                         context->in_use = true;
  95                         memset(context->data, 0,
  96                                         MAX_TOTAL_SIZE_WITH_ALL_HEADERS);
  97
  98                         context->hdr = NULL;
  99
 100                         return context;
 101                 }
 102         }
 103
 104         if (ii == priv->num_tx_context)
 105                 dev_dbg(&priv->usb->dev, "%s No Free Tx Context\n", __func__);
 106
 107         return NULL;
 108 }
 109
 110 static __le16 vnt_time_stamp_off(struct vnt_private *priv, u16 rate)
 111 {
 112         return cpu_to_le16(vnt_time_stampoff[priv->preamble_type % 2]
 113                                                         [rate % MAX_RATE]);
 114 }
 115
 116 static u32 vnt_get_rsvtime(struct vnt_private *priv, u8 pkt_type,
 117         u32 frame_length, u16 rate, int need_ack)
 118 {
 119         u32 data_time, ack_time;
 120
 121         data_time = vnt_get_frame_time(priv->preamble_type, pkt_type,
 122                                                         frame_length, rate);
 123
 124         if (pkt_type == PK_TYPE_11B)
 125                 ack_time = vnt_get_frame_time(priv->preamble_type, pkt_type,
 126                                         14, (u16)priv->top_cck_basic_rate);
 127         else
 128                 ack_time = vnt_get_frame_time(priv->preamble_type, pkt_type,
 129                                         14, (u16)priv->top_ofdm_basic_rate);
 130
 131         if (need_ack)
 132                 return data_time + priv->sifs + ack_time;
 133
 134         return data_time;
 135 }
 136
 137 static __le16 vnt_rxtx_rsvtime_le16(struct vnt_private *priv, u8 pkt_type,
 138         u32 frame_length, u16 rate, int need_ack)
 139 {
 140         return cpu_to_le16((u16)vnt_get_rsvtime(priv, pkt_type,
 141                 frame_length, rate, need_ack));
 142 }
 143
 144 static __le16 vnt_get_rtscts_rsvtime_le(struct vnt_private *priv,
 145         u8 rsv_type, u8 pkt_type, u32 frame_length, u16 current_rate)
 146 {
 147         u32 rrv_time, rts_time, cts_time, ack_time, data_time;
 148
 149         rrv_time = rts_time = cts_time = ack_time = data_time = 0;
 150
 151         data_time = vnt_get_frame_time(priv->preamble_type, pkt_type,
 152                                                 frame_length, current_rate);
 153
 154         if (rsv_type == 0) {
 155                 rts_time = vnt_get_frame_time(priv->preamble_type,
 156                         pkt_type, 20, priv->top_cck_basic_rate);
 157                 cts_time = ack_time = vnt_get_frame_time(priv->preamble_type,
 158                         pkt_type, 14, priv->top_cck_basic_rate);
 159         } else if (rsv_type == 1) {
 160                 rts_time = vnt_get_frame_time(priv->preamble_type,
 161                         pkt_type, 20, priv->top_cck_basic_rate);
 162                 cts_time = vnt_get_frame_time(priv->preamble_type, pkt_type,
 163                         14, priv->top_cck_basic_rate);
 164                 ack_time = vnt_get_frame_time(priv->preamble_type, pkt_type,
 165                         14, priv->top_ofdm_basic_rate);
 166         } else if (rsv_type == 2) {
 167                 rts_time = vnt_get_frame_time(priv->preamble_type, pkt_type,
 168                         20, priv->top_ofdm_basic_rate);
 169                 cts_time = ack_time = vnt_get_frame_time(priv->preamble_type,
 170                         pkt_type, 14, priv->top_ofdm_basic_rate);
 171         } else if (rsv_type == 3) {
 172                 cts_time = vnt_get_frame_time(priv->preamble_type, pkt_type,
 173                         14, priv->top_cck_basic_rate);
 174                 ack_time = vnt_get_frame_time(priv->preamble_type, pkt_type,
 175                         14, priv->top_ofdm_basic_rate);
 176
 177                 rrv_time = cts_time + ack_time + data_time + 2 * priv->sifs;
 178
 179                 return cpu_to_le16((u16)rrv_time);
 180         }
 181
 182         rrv_time = rts_time + cts_time + ack_time + data_time + 3 * priv->sifs;
 183
 184         return cpu_to_le16((u16)rrv_time);
 185 }
 186
 187 static __le16 vnt_get_duration_le(struct vnt_private *priv,
 188                                         u8 pkt_type, int need_ack)
 189 {
 190         u32 ack_time = 0;
 191
 192         if (need_ack) {
 193                 if (pkt_type == PK_TYPE_11B)
 194                         ack_time = vnt_get_frame_time(priv->preamble_type,
 195                                 pkt_type, 14, priv->top_cck_basic_rate);
 196                 else
 197                         ack_time = vnt_get_frame_time(priv->preamble_type,
 198                                 pkt_type, 14, priv->top_ofdm_basic_rate);
 199
 200                 return cpu_to_le16((u16)(priv->sifs + ack_time));
 201         }
 202
 203         return 0;
 204 }
 205
 206 static __le16 vnt_get_rtscts_duration_le(struct vnt_usb_send_context *context,
 207                                          u8 dur_type, u8 pkt_type, u16 rate)
 208 {
 209         struct vnt_private *priv = context->priv;
 210         u32 cts_time = 0, dur_time = 0;
 211         u32 frame_length = context->frame_len;
 212         u8 need_ack = context->need_ack;
 213
 214         switch (dur_type) {
 215         case RTSDUR_BB:
 216         case RTSDUR_BA:
 217         case RTSDUR_BA_F0:
 218         case RTSDUR_BA_F1:
 219                 cts_time = vnt_get_frame_time(priv->preamble_type,
 220                                 pkt_type, 14, priv->top_cck_basic_rate);
 221                 dur_time = cts_time + 2 * priv->sifs +
 222                         vnt_get_rsvtime(priv, pkt_type,
 223                                                 frame_length, rate, need_ack);
 224                 break;
 225
 226         case RTSDUR_AA:
 227         case RTSDUR_AA_F0:
 228         case RTSDUR_AA_F1:
 229                 cts_time = vnt_get_frame_time(priv->preamble_type,
 230                                 pkt_type, 14, priv->top_ofdm_basic_rate);
 231                 dur_time = cts_time + 2 * priv->sifs +
 232                         vnt_get_rsvtime(priv, pkt_type,
 233                                                 frame_length, rate, need_ack);
 234                 break;
 235
 236         case CTSDUR_BA:
 237         case CTSDUR_BA_F0:
 238         case CTSDUR_BA_F1:
 239                 dur_time = priv->sifs + vnt_get_rsvtime(priv,
 240                                 pkt_type, frame_length, rate, need_ack);
 241                 break;
 242
 243         default:
 244                 break;
 245         }
 246
 247         return cpu_to_le16((u16)dur_time);
 248 }
 249
 250 static u16 vnt_mac_hdr_pos(struct vnt_usb_send_context *tx_context,
 251         struct ieee80211_hdr *hdr)
 252 {
 253         u8 *head = tx_context->data + offsetof(struct vnt_tx_buffer, fifo_head);
 254         u8 *hdr_pos = (u8 *)hdr;
 255
 256         tx_context->hdr = hdr;
 257         if (!tx_context->hdr)
 258                 return 0;
 259
 260         return (u16)(hdr_pos - head);
 261 }
 262
 263 static u16 vnt_rxtx_datahead_g(struct vnt_usb_send_context *tx_context,
 264                                struct vnt_tx_datahead_g *buf)
 265 {
 266
 267         struct vnt_private *priv = tx_context->priv;
 268         struct ieee80211_hdr *hdr =
 269                                 (struct ieee80211_hdr *)tx_context->skb->data;
 270         u32 frame_len = tx_context->frame_len;
 271         u16 rate = tx_context->tx_rate;
 272         u8 need_ack = tx_context->need_ack;
 273
 274         /* Get SignalField,ServiceField,Length */
 275         vnt_get_phy_field(priv, frame_len, rate, tx_context->pkt_type, &buf->a);
 276         vnt_get_phy_field(priv, frame_len, priv->top_cck_basic_rate,
 277                                                         PK_TYPE_11B, &buf->b);
 278
 279         /* Get Duration and TimeStamp */
 280         if (ieee80211_is_pspoll(hdr->frame_control)) {
 281                 __le16 dur = cpu_to_le16(priv->current_aid | BIT(14) | BIT(15));
 282
 283                 buf->duration_a = dur;
 284                 buf->duration_b = dur;
 285         } else {
 286                 buf->duration_a = vnt_get_duration_le(priv,
 287                                                 tx_context->pkt_type, need_ack);
 288                 buf->duration_b = vnt_get_duration_le(priv,
 289                                                         PK_TYPE_11B, need_ack);
 290         }
 291
 292         buf->time_stamp_off_a = vnt_time_stamp_off(priv, rate);
 293         buf->time_stamp_off_b = vnt_time_stamp_off(priv,
 294                                         priv->top_cck_basic_rate);
 295
 296         tx_context->tx_hdr_size = vnt_mac_hdr_pos(tx_context, &buf->hdr);
 297
 298         return le16_to_cpu(buf->duration_a);
 299 }
 300
 301 static u16 vnt_rxtx_datahead_g_fb(struct vnt_usb_send_context *tx_context,
 302                                   struct vnt_tx_datahead_g_fb *buf)
 303 {
 304         struct vnt_private *priv = tx_context->priv;
 305         u32 frame_len = tx_context->frame_len;
 306         u16 rate = tx_context->tx_rate;
 307         u8 need_ack = tx_context->need_ack;
 308
 309         /* Get SignalField,ServiceField,Length */
 310         vnt_get_phy_field(priv, frame_len, rate, tx_context->pkt_type, &buf->a);
 311
 312         vnt_get_phy_field(priv, frame_len, priv->top_cck_basic_rate,
 313                                                 PK_TYPE_11B, &buf->b);
 314
 315         /* Get Duration and TimeStamp */
 316         buf->duration_a = vnt_get_duration_le(priv, tx_context->pkt_type,
 317                                               need_ack);
 318         buf->duration_b = vnt_get_duration_le(priv, PK_TYPE_11B, need_ack);
 319
 320         buf->duration_a_f0 = vnt_get_duration_le(priv, tx_context->pkt_type,
 321                                                  need_ack);
 322         buf->duration_a_f1 = vnt_get_duration_le(priv, tx_context->pkt_type,
 323                                                  need_ack);
 324
 325         buf->time_stamp_off_a = vnt_time_stamp_off(priv, rate);
 326         buf->time_stamp_off_b = vnt_time_stamp_off(priv,
 327                                                 priv->top_cck_basic_rate);
 328
 329         tx_context->tx_hdr_size = vnt_mac_hdr_pos(tx_context, &buf->hdr);
 330
 331         return le16_to_cpu(buf->duration_a);
 332 }
 333
 334 static u16 vnt_rxtx_datahead_a_fb(struct vnt_usb_send_context *tx_context,
 335                                   struct vnt_tx_datahead_a_fb *buf)
 336 {
 337         struct vnt_private *priv = tx_context->priv;
 338         u16 rate = tx_context->tx_rate;
 339         u8 pkt_type = tx_context->pkt_type;
 340         u8 need_ack = tx_context->need_ack;
 341         u32 frame_len = tx_context->frame_len;
 342
 343         /* Get SignalField,ServiceField,Length */
 344         vnt_get_phy_field(priv, frame_len, rate, pkt_type, &buf->a);
 345         /* Get Duration and TimeStampOff */
 346         buf->duration = vnt_get_duration_le(priv, pkt_type, need_ack);
 347
 348         buf->duration_f0 = vnt_get_duration_le(priv, pkt_type, need_ack);
 349         buf->duration_f1 = vnt_get_duration_le(priv, pkt_type, need_ack);
 350
 351         buf->time_stamp_off = vnt_time_stamp_off(priv, rate);
 352
 353         tx_context->tx_hdr_size = vnt_mac_hdr_pos(tx_context, &buf->hdr);
 354
 355         return le16_to_cpu(buf->duration);
 356 }
 357
 358 static u16 vnt_rxtx_datahead_ab(struct vnt_usb_send_context *tx_context,
 359                                 struct vnt_tx_datahead_ab *buf)
 360 {
 361         struct vnt_private *priv = tx_context->priv;
 362         struct ieee80211_hdr *hdr =
 363                                 (struct ieee80211_hdr *)tx_context->skb->data;
 364         u32 frame_len = tx_context->frame_len;
 365         u16 rate = tx_context->tx_rate;
 366         u8 need_ack = tx_context->need_ack;
 367
 368         /* Get SignalField,ServiceField,Length */
 369         vnt_get_phy_field(priv, frame_len, rate,
 370                           tx_context->pkt_type, &buf->ab);
 371
 372         /* Get Duration and TimeStampOff */
 373         if (ieee80211_is_pspoll(hdr->frame_control)) {
 374                 __le16 dur = cpu_to_le16(priv->current_aid | BIT(14) | BIT(15));
 375
 376                 buf->duration = dur;
 377         } else {
 378                 buf->duration = vnt_get_duration_le(priv, tx_context->pkt_type,
 379                                                     need_ack);
 380         }
 381
 382         buf->time_stamp_off = vnt_time_stamp_off(priv, rate);
 383
 384         tx_context->tx_hdr_size = vnt_mac_hdr_pos(tx_context, &buf->hdr);
 385
 386         return le16_to_cpu(buf->duration);
 387 }
 388
 389 static int vnt_fill_ieee80211_rts(struct vnt_usb_send_context *tx_context,
 390         struct ieee80211_rts *rts, __le16 duration)
 391 {
 392         struct ieee80211_hdr *hdr =
 393                                 (struct ieee80211_hdr *)tx_context->skb->data;
 394
 395         rts->duration = duration;
 396         rts->frame_control =
 397                 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
 398
 399         ether_addr_copy(rts->ra, hdr->addr1);
 400         ether_addr_copy(rts->ta, hdr->addr2);
 401
 402         return 0;
 403 }
 404
 405 static u16 vnt_rxtx_rts_g_head(struct vnt_usb_send_context *tx_context,
 406                                struct vnt_rts_g *buf)
 407 {
 408         struct vnt_private *priv = tx_context->priv;
 409         u16 rts_frame_len = 20;
 410         u16 current_rate = tx_context->tx_rate;
 411
 412         vnt_get_phy_field(priv, rts_frame_len, priv->top_cck_basic_rate,
 413                 PK_TYPE_11B, &buf->b);
 414         vnt_get_phy_field(priv, rts_frame_len, priv->top_ofdm_basic_rate,
 415                           tx_context->pkt_type, &buf->a);
 416
 417         buf->duration_bb = vnt_get_rtscts_duration_le(tx_context, RTSDUR_BB,
 418                                                       PK_TYPE_11B,
 419                                                       priv->top_cck_basic_rate);
 420         buf->duration_aa = vnt_get_rtscts_duration_le(tx_context, RTSDUR_AA,
 421                                                       tx_context->pkt_type,
 422                                                       current_rate);
 423         buf->duration_ba = vnt_get_rtscts_duration_le(tx_context, RTSDUR_BA,
 424                                                       tx_context->pkt_type,
 425                                                       current_rate);
 426
 427         vnt_fill_ieee80211_rts(tx_context, &buf->data, buf->duration_aa);
 428
 429         return vnt_rxtx_datahead_g(tx_context, &buf->data_head);
 430 }
 431
 432 static u16 vnt_rxtx_rts_g_fb_head(struct vnt_usb_send_context *tx_context,
 433                                   struct vnt_rts_g_fb *buf)
 434 {
 435         struct vnt_private *priv = tx_context->priv;
 436         u16 current_rate = tx_context->tx_rate;
 437         u16 rts_frame_len = 20;
 438
 439         vnt_get_phy_field(priv, rts_frame_len, priv->top_cck_basic_rate,
 440                 PK_TYPE_11B, &buf->b);
 441         vnt_get_phy_field(priv, rts_frame_len, priv->top_ofdm_basic_rate,
 442                           tx_context->pkt_type, &buf->a);
 443
 444         buf->duration_bb = vnt_get_rtscts_duration_le(tx_context, RTSDUR_BB,
 445                                                       PK_TYPE_11B,
 446                                                       priv->top_cck_basic_rate);
 447         buf->duration_aa = vnt_get_rtscts_duration_le(tx_context, RTSDUR_AA,
 448                                                       tx_context->pkt_type,
 449                                                       current_rate);
 450         buf->duration_ba = vnt_get_rtscts_duration_le(tx_context, RTSDUR_BA,
 451                                                       tx_context->pkt_type,
 452                                                       current_rate);
 453
 454         buf->rts_duration_ba_f0 =
 455                 vnt_get_rtscts_duration_le(tx_context, RTSDUR_BA_F0,
 456                                            tx_context->pkt_type,
 457                                            priv->tx_rate_fb0);
 458         buf->rts_duration_aa_f0 =
 459                 vnt_get_rtscts_duration_le(tx_context, RTSDUR_AA_F0,
 460                                            tx_context->pkt_type,
 461                                            priv->tx_rate_fb0);
 462         buf->rts_duration_ba_f1 =
 463                 vnt_get_rtscts_duration_le(tx_context, RTSDUR_BA_F1,
 464                                            tx_context->pkt_type,
 465                                            priv->tx_rate_fb1);
 466         buf->rts_duration_aa_f1 =
 467                 vnt_get_rtscts_duration_le(tx_context, RTSDUR_AA_F1,
 468                                            tx_context->pkt_type,
 469                                            priv->tx_rate_fb1);
 470
 471         vnt_fill_ieee80211_rts(tx_context, &buf->data, buf->duration_aa);
 472
 473         return vnt_rxtx_datahead_g_fb(tx_context, &buf->data_head);
 474 }
 475
 476 static u16 vnt_rxtx_rts_ab_head(struct vnt_usb_send_context *tx_context,
 477                                 struct vnt_rts_ab *buf)
 478 {
 479         struct vnt_private *priv = tx_context->priv;
 480         u16 current_rate = tx_context->tx_rate;
 481         u16 rts_frame_len = 20;
 482
 483         vnt_get_phy_field(priv, rts_frame_len, priv->top_ofdm_basic_rate,
 484                           tx_context->pkt_type, &buf->ab);
 485
 486         buf->duration = vnt_get_rtscts_duration_le(tx_context, RTSDUR_AA,
 487                                                    tx_context->pkt_type,
 488                                                    current_rate);
 489
 490         vnt_fill_ieee80211_rts(tx_context, &buf->data, buf->duration);
 491
 492         return vnt_rxtx_datahead_ab(tx_context, &buf->data_head);
 493 }
 494
 495 static u16 vnt_rxtx_rts_a_fb_head(struct vnt_usb_send_context *tx_context,
 496                                   struct vnt_rts_a_fb *buf)
 497 {
 498         struct vnt_private *priv = tx_context->priv;
 499         u16 current_rate = tx_context->tx_rate;
 500         u16 rts_frame_len = 20;
 501
 502         vnt_get_phy_field(priv, rts_frame_len,
 503                 priv->top_ofdm_basic_rate, tx_context->pkt_type, &buf->a);
 504
 505         buf->duration = vnt_get_rtscts_duration_le(tx_context, RTSDUR_AA,
 506                                                    tx_context->pkt_type,
 507                                                    current_rate);
 508
 509         buf->rts_duration_f0 =
 510                 vnt_get_rtscts_duration_le(tx_context, RTSDUR_AA_F0,
 511                                            tx_context->pkt_type,
 512                                            priv->tx_rate_fb0);
 513
 514         buf->rts_duration_f1 =
 515                 vnt_get_rtscts_duration_le(tx_context, RTSDUR_AA_F1,
 516                                            tx_context->pkt_type,
 517                                            priv->tx_rate_fb1);
 518
 519         vnt_fill_ieee80211_rts(tx_context, &buf->data, buf->duration);
 520
 521         return vnt_rxtx_datahead_a_fb(tx_context, &buf->data_head);
 522 }
 523
 524 static u16 vnt_fill_cts_fb_head(struct vnt_usb_send_context *tx_context,
 525                                 union vnt_tx_data_head *head)
 526 {
 527         struct vnt_private *priv = tx_context->priv;
 528         struct vnt_cts_fb *buf = &head->cts_g_fb;
 529         u32 cts_frame_len = 14;
 530         u16 current_rate = tx_context->tx_rate;
 531
 532         /* Get SignalField,ServiceField,Length */
 533         vnt_get_phy_field(priv, cts_frame_len, priv->top_cck_basic_rate,
 534                           PK_TYPE_11B, &buf->b);
 535
 536         buf->duration_ba =
 537                 vnt_get_rtscts_duration_le(tx_context, CTSDUR_BA,
 538                                            tx_context->pkt_type,
 539                                            current_rate);
 540         /* Get CTSDuration_ba_f0 */
 541         buf->cts_duration_ba_f0 =
 542                 vnt_get_rtscts_duration_le(tx_context, CTSDUR_BA_F0,
 543                                            tx_context->pkt_type,
 544                                            priv->tx_rate_fb0);
 545         /* Get CTSDuration_ba_f1 */
 546         buf->cts_duration_ba_f1 =
 547                 vnt_get_rtscts_duration_le(tx_context, CTSDUR_BA_F1,
 548                                            tx_context->pkt_type,
 549                                            priv->tx_rate_fb1);
 550         /* Get CTS Frame body */
 551         buf->data.duration = buf->duration_ba;
 552         buf->data.frame_control =
 553                 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
 554
 555         ether_addr_copy(buf->data.ra, priv->current_net_addr);
 556
 557         return vnt_rxtx_datahead_g_fb(tx_context, &buf->data_head);
 558 }
 559
 560 static u16 vnt_fill_cts_head(struct vnt_usb_send_context *tx_context,
 561                              union vnt_tx_data_head *head)
 562 {
 563         struct vnt_private *priv = tx_context->priv;
 564         struct vnt_cts *buf = &head->cts_g;
 565         u32 cts_frame_len = 14;
 566         u16 current_rate = tx_context->tx_rate;
 567
 568         /* Get SignalField,ServiceField,Length */
 569         vnt_get_phy_field(priv, cts_frame_len, priv->top_cck_basic_rate,
 570                           PK_TYPE_11B, &buf->b);
 571         /* Get CTSDuration_ba */
 572         buf->duration_ba =
 573                 vnt_get_rtscts_duration_le(tx_context, CTSDUR_BA,
 574                                            tx_context->pkt_type,
 575                                            current_rate);
 576         /*Get CTS Frame body*/
 577         buf->data.duration = buf->duration_ba;
 578         buf->data.frame_control =
 579                 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
 580
 581         ether_addr_copy(buf->data.ra, priv->current_net_addr);
 582
 583         return vnt_rxtx_datahead_g(tx_context, &buf->data_head);
 584 }
 585
 586 static u16 vnt_rxtx_rts(struct vnt_usb_send_context *tx_context,
 587                         union vnt_tx_head *tx_head, bool need_mic)
 588 {
 589         struct vnt_private *priv = tx_context->priv;
 590         struct vnt_rrv_time_rts *buf = &tx_head->tx_rts.rts;
 591         union vnt_tx_data_head *head = &tx_head->tx_rts.tx.head;
 592         u32 frame_len = tx_context->frame_len;
 593         u16 current_rate = tx_context->tx_rate;
 594         u8 need_ack = tx_context->need_ack;
 595
 596         buf->rts_rrv_time_aa = vnt_get_rtscts_rsvtime_le(priv, 2,
 597                         tx_context->pkt_type, frame_len, current_rate);
 598         buf->rts_rrv_time_ba = vnt_get_rtscts_rsvtime_le(priv, 1,
 599                         tx_context->pkt_type, frame_len, current_rate);
 600         buf->rts_rrv_time_bb = vnt_get_rtscts_rsvtime_le(priv, 0,
 601                         tx_context->pkt_type, frame_len, current_rate);
 602
 603         buf->rrv_time_a = vnt_rxtx_rsvtime_le16(priv, tx_context->pkt_type,
 604                                                 frame_len, current_rate,
 605                                                 need_ack);
 606         buf->rrv_time_b = vnt_rxtx_rsvtime_le16(priv, PK_TYPE_11B, frame_len,
 607                                         priv->top_cck_basic_rate, need_ack);
 608
 609         if (need_mic)
 610                 head = &tx_head->tx_rts.tx.mic.head;
 611
 612         if (tx_context->fb_option)
 613                 return vnt_rxtx_rts_g_fb_head(tx_context, &head->rts_g_fb);
 614
 615         return vnt_rxtx_rts_g_head(tx_context, &head->rts_g);
 616 }
 617
 618 static u16 vnt_rxtx_cts(struct vnt_usb_send_context *tx_context,
 619                         union vnt_tx_head *tx_head, bool need_mic)
 620 {
 621         struct vnt_private *priv = tx_context->priv;
 622         struct vnt_rrv_time_cts *buf = &tx_head->tx_cts.cts;
 623         union vnt_tx_data_head *head = &tx_head->tx_cts.tx.head;
 624         u32 frame_len = tx_context->frame_len;
 625         u16 current_rate = tx_context->tx_rate;
 626         u8 need_ack = tx_context->need_ack;
 627
 628         buf->rrv_time_a = vnt_rxtx_rsvtime_le16(priv, tx_context->pkt_type,
 629                                         frame_len, current_rate, need_ack);
 630         buf->rrv_time_b = vnt_rxtx_rsvtime_le16(priv, PK_TYPE_11B,
 631                                 frame_len, priv->top_cck_basic_rate, need_ack);
 632
 633         buf->cts_rrv_time_ba = vnt_get_rtscts_rsvtime_le(priv, 3,
 634                         tx_context->pkt_type, frame_len, current_rate);
 635
 636         if (need_mic)
 637                 head = &tx_head->tx_cts.tx.mic.head;
 638
 639         /* Fill CTS */
 640         if (tx_context->fb_option)
 641                 return vnt_fill_cts_fb_head(tx_context, head);
 642
 643         return vnt_fill_cts_head(tx_context, head);
 644 }
 645
 646 static u16 vnt_rxtx_ab(struct vnt_usb_send_context *tx_context,
 647                        union vnt_tx_head *tx_head, bool need_rts, bool need_mic)
 648 {
 649         struct vnt_private *priv = tx_context->priv;
 650         struct vnt_rrv_time_ab *buf = &tx_head->tx_ab.ab;
 651         union vnt_tx_data_head *head = &tx_head->tx_ab.tx.head;
 652         u32 frame_len = tx_context->frame_len;
 653         u16 current_rate = tx_context->tx_rate;
 654         u8 need_ack = tx_context->need_ack;
 655
 656         buf->rrv_time = vnt_rxtx_rsvtime_le16(priv, tx_context->pkt_type,
 657                         frame_len, current_rate, need_ack);
 658
 659         if (need_mic)
 660                 head = &tx_head->tx_ab.tx.mic.head;
 661
 662         if (need_rts) {
 663                 if (tx_context->pkt_type == PK_TYPE_11B)
 664                         buf->rts_rrv_time = vnt_get_rtscts_rsvtime_le(priv, 0,
 665                                 tx_context->pkt_type, frame_len, current_rate);
 666                 else /* PK_TYPE_11A */
 667                         buf->rts_rrv_time = vnt_get_rtscts_rsvtime_le(priv, 2,
 668                                 tx_context->pkt_type, frame_len, current_rate);
 669
 670                 if (tx_context->fb_option &&
 671                     tx_context->pkt_type == PK_TYPE_11A)
 672                         return vnt_rxtx_rts_a_fb_head(tx_context,
 673                                                       &head->rts_a_fb);
 674
 675                 return vnt_rxtx_rts_ab_head(tx_context, &head->rts_ab);
 676         }
 677
 678         if (tx_context->pkt_type == PK_TYPE_11A)
 679                 return vnt_rxtx_datahead_a_fb(tx_context,
 680                                               &head->data_head_a_fb);
 681
 682         return vnt_rxtx_datahead_ab(tx_context, &head->data_head_ab);
 683 }
 684
 685 static u16 vnt_generate_tx_parameter(struct vnt_usb_send_context *tx_context,
 686         struct vnt_tx_buffer *tx_buffer,
 687         struct vnt_mic_hdr **mic_hdr, u32 need_mic,
 688         bool need_rts)
 689 {
 690
 691         if (tx_context->pkt_type == PK_TYPE_11GB ||
 692             tx_context->pkt_type == PK_TYPE_11GA) {
 693                 if (need_rts) {
 694                         if (need_mic)
 695                                 *mic_hdr = &tx_buffer->
 696                                                 tx_head.tx_rts.tx.mic.hdr;
 697
 698                         return vnt_rxtx_rts(tx_context, &tx_buffer->tx_head,
 699                                             need_mic);
 700                 }
 701
 702                 if (need_mic)
 703                         *mic_hdr = &tx_buffer->tx_head.tx_cts.tx.mic.hdr;
 704
 705                 return vnt_rxtx_cts(tx_context, &tx_buffer->tx_head, need_mic);
 706         }
 707
 708         if (need_mic)
 709                 *mic_hdr = &tx_buffer->tx_head.tx_ab.tx.mic.hdr;
 710
 711         return vnt_rxtx_ab(tx_context, &tx_buffer->tx_head, need_rts, need_mic);
 712 }
 713
 714 static void vnt_fill_txkey(struct vnt_usb_send_context *tx_context,
 715         u8 *key_buffer, struct ieee80211_key_conf *tx_key, struct sk_buff *skb,
 716         u16 payload_len, struct vnt_mic_hdr *mic_hdr)
 717 {
 718         struct ieee80211_hdr *hdr = tx_context->hdr;
 719         struct ieee80211_key_seq seq;
 720         u8 *iv = ((u8 *)hdr + ieee80211_get_hdrlen_from_skb(skb));
 721
 722         /* strip header and icv len from payload */
 723         payload_len -= ieee80211_get_hdrlen_from_skb(skb);
 724         payload_len -= tx_key->icv_len;
 725
 726         switch (tx_key->cipher) {
 727         case WLAN_CIPHER_SUITE_WEP40:
 728         case WLAN_CIPHER_SUITE_WEP104:
 729                 memcpy(key_buffer, iv, 3);
 730                 memcpy(key_buffer + 3, tx_key->key, tx_key->keylen);
 731
 732                 if (tx_key->keylen == WLAN_KEY_LEN_WEP40) {
 733                         memcpy(key_buffer + 8, iv, 3);
 734                         memcpy(key_buffer + 11,
 735                                         tx_key->key, WLAN_KEY_LEN_WEP40);
 736                 }
 737
 738                 break;
 739         case WLAN_CIPHER_SUITE_TKIP:
 740                 ieee80211_get_tkip_p2k(tx_key, skb, key_buffer);
 741
 742                 break;
 743         case WLAN_CIPHER_SUITE_CCMP:
 744
 745                 if (!mic_hdr)
 746                         return;
 747
 748                 mic_hdr->id = 0x59;
 749                 mic_hdr->payload_len = cpu_to_be16(payload_len);
 750                 ether_addr_copy(mic_hdr->mic_addr2, hdr->addr2);
 751
 752                 ieee80211_get_key_tx_seq(tx_key, &seq);
 753
 754                 memcpy(mic_hdr->ccmp_pn, seq.ccmp.pn, IEEE80211_CCMP_PN_LEN);
 755
 756                 if (ieee80211_has_a4(hdr->frame_control))
 757                         mic_hdr->hlen = cpu_to_be16(28);
 758                 else
 759                         mic_hdr->hlen = cpu_to_be16(22);
 760
 761                 ether_addr_copy(mic_hdr->addr1, hdr->addr1);
 762                 ether_addr_copy(mic_hdr->addr2, hdr->addr2);
 763                 ether_addr_copy(mic_hdr->addr3, hdr->addr3);
 764
 765                 mic_hdr->frame_control = cpu_to_le16(
 766                         le16_to_cpu(hdr->frame_control) & 0xc78f);
 767                 mic_hdr->seq_ctrl = cpu_to_le16(
 768                                 le16_to_cpu(hdr->seq_ctrl) & 0xf);
 769
 770                 if (ieee80211_has_a4(hdr->frame_control))
 771                         ether_addr_copy(mic_hdr->addr4, hdr->addr4);
 772
 773
 774                 memcpy(key_buffer, tx_key->key, WLAN_KEY_LEN_CCMP);
 775
 776                 break;
 777         default:
 778                 break;
 779         }
 780
 781 }
 782
 783 int vnt_tx_packet(struct vnt_private *priv, struct sk_buff *skb)
 784 {
 785         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 786         struct ieee80211_tx_rate *tx_rate = &info->control.rates[0];
 787         struct ieee80211_rate *rate;
 788         struct ieee80211_key_conf *tx_key;
 789         struct ieee80211_hdr *hdr;
 790         struct vnt_mic_hdr *mic_hdr = NULL;
 791         struct vnt_tx_buffer *tx_buffer;
 792         struct vnt_tx_fifo_head *tx_buffer_head;
 793         struct vnt_usb_send_context *tx_context;
 794         unsigned long flags;
 795         u16 tx_bytes, tx_header_size, tx_body_size, current_rate, duration_id;
 796         u8 pkt_type, fb_option = AUTO_FB_NONE;
 797         bool need_rts = false, is_pspoll = false;
 798         bool need_mic = false;
 799
 800         hdr = (struct ieee80211_hdr *)(skb->data);
 801
 802         rate = ieee80211_get_tx_rate(priv->hw, info);
 803
 804         current_rate = rate->hw_value;
 805         if (priv->current_rate != current_rate &&
 806                         !(priv->hw->conf.flags & IEEE80211_CONF_OFFCHANNEL)) {
 807                 priv->current_rate = current_rate;
 808                 vnt_schedule_command(priv, WLAN_CMD_SETPOWER);
 809         }
 810
 811         if (current_rate > RATE_11M) {
 812                 if (info->band == IEEE80211_BAND_5GHZ) {
 813                         pkt_type = PK_TYPE_11A;
 814                 } else {
 815                         if (tx_rate->flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
 816                                 pkt_type = PK_TYPE_11GB;
 817                         else
 818                                 pkt_type = PK_TYPE_11GA;
 819                 }
 820         } else {
 821                 pkt_type = PK_TYPE_11B;
 822         }
 823
 824         spin_lock_irqsave(&priv->lock, flags);
 825
 826         tx_context = vnt_get_free_context(priv);
 827         if (!tx_context) {
 828                 dev_dbg(&priv->usb->dev, "%s No free context\n", __func__);
 829                 spin_unlock_irqrestore(&priv->lock, flags);
 830                 return -ENOMEM;
 831         }
 832
 833         tx_context->skb = skb;
 834         tx_context->pkt_type = pkt_type;
 835         tx_context->need_ack = false;
 836         tx_context->frame_len = skb->len + 4;
 837         tx_context->tx_rate = current_rate;
 838
 839         spin_unlock_irqrestore(&priv->lock, flags);
 840
 841         tx_buffer = (struct vnt_tx_buffer *)tx_context->data;
 842         tx_buffer_head = &tx_buffer->fifo_head;
 843         tx_body_size = skb->len;
 844
 845         /*Set fifo controls */
 846         if (pkt_type == PK_TYPE_11A)
 847                 tx_buffer_head->fifo_ctl = 0;
 848         else if (pkt_type == PK_TYPE_11B)
 849                 tx_buffer_head->fifo_ctl = cpu_to_le16(FIFOCTL_11B);
 850         else if (pkt_type == PK_TYPE_11GB)
 851                 tx_buffer_head->fifo_ctl = cpu_to_le16(FIFOCTL_11GB);
 852         else if (pkt_type == PK_TYPE_11GA)
 853                 tx_buffer_head->fifo_ctl = cpu_to_le16(FIFOCTL_11GA);
 854
 855         if (!ieee80211_is_data(hdr->frame_control)) {
 856                 tx_buffer_head->fifo_ctl |= cpu_to_le16(FIFOCTL_GENINT |
 857                                                         FIFOCTL_ISDMA0);
 858                 tx_buffer_head->fifo_ctl |= cpu_to_le16(FIFOCTL_TMOEN);
 859
 860                 tx_buffer_head->time_stamp =
 861                         cpu_to_le16(DEFAULT_MGN_LIFETIME_RES_64us);
 862         } else {
 863                 tx_buffer_head->time_stamp =
 864                         cpu_to_le16(DEFAULT_MSDU_LIFETIME_RES_64us);
 865         }
 866
 867         if (!(info->flags & IEEE80211_TX_CTL_NO_ACK)) {
 868                 tx_buffer_head->fifo_ctl |= cpu_to_le16(FIFOCTL_NEEDACK);
 869                 tx_context->need_ack = true;
 870         }
 871
 872         if (ieee80211_has_retry(hdr->frame_control))
 873                 tx_buffer_head->fifo_ctl |= cpu_to_le16(FIFOCTL_LRETRY);
 874
 875         if (tx_rate->flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)
 876                 priv->preamble_type = PREAMBLE_SHORT;
 877         else
 878                 priv->preamble_type = PREAMBLE_LONG;
 879
 880         if (tx_rate->flags & IEEE80211_TX_RC_USE_RTS_CTS) {
 881                 need_rts = true;
 882                 tx_buffer_head->fifo_ctl |= cpu_to_le16(FIFOCTL_RTS);
 883         }
 884
 885         if (ieee80211_has_a4(hdr->frame_control))
 886                 tx_buffer_head->fifo_ctl |= cpu_to_le16(FIFOCTL_LHEAD);
 887
 888         if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER)
 889                 is_pspoll = true;
 890
 891         tx_buffer_head->frag_ctl =
 892                         cpu_to_le16(ieee80211_get_hdrlen_from_skb(skb) << 10);
 893
 894         if (info->control.hw_key) {
 895                 tx_key = info->control.hw_key;
 896                 switch (info->control.hw_key->cipher) {
 897                 case WLAN_CIPHER_SUITE_WEP40:
 898                 case WLAN_CIPHER_SUITE_WEP104:
 899                         tx_buffer_head->frag_ctl |= cpu_to_le16(FRAGCTL_LEGACY);
 900                         break;
 901                 case WLAN_CIPHER_SUITE_TKIP:
 902                         tx_buffer_head->frag_ctl |= cpu_to_le16(FRAGCTL_TKIP);
 903                         break;
 904                 case WLAN_CIPHER_SUITE_CCMP:
 905                         tx_buffer_head->frag_ctl |= cpu_to_le16(FRAGCTL_AES);
 906                         need_mic = true;
 907                 default:
 908                         break;
 909                 }
 910                 tx_context->frame_len += tx_key->icv_len;
 911         }
 912
 913         tx_buffer_head->current_rate = cpu_to_le16(current_rate);
 914
 915         /* legacy rates TODO use ieee80211_tx_rate */
 916         if (current_rate >= RATE_18M && ieee80211_is_data(hdr->frame_control)) {
 917                 if (priv->auto_fb_ctrl == AUTO_FB_0) {
 918                         tx_buffer_head->fifo_ctl |=
 919                                                 cpu_to_le16(FIFOCTL_AUTO_FB_0);
 920
 921                         priv->tx_rate_fb0 =
 922                                 vnt_fb_opt0[FB_RATE0][current_rate - RATE_18M];
 923                         priv->tx_rate_fb1 =
 924                                 vnt_fb_opt0[FB_RATE1][current_rate - RATE_18M];
 925
 926                         fb_option = AUTO_FB_0;
 927                 } else if (priv->auto_fb_ctrl == AUTO_FB_1) {
 928                         tx_buffer_head->fifo_ctl |=
 929                                                 cpu_to_le16(FIFOCTL_AUTO_FB_1);
 930
 931                         priv->tx_rate_fb0 =
 932                                 vnt_fb_opt1[FB_RATE0][current_rate - RATE_18M];
 933                         priv->tx_rate_fb1 =
 934                                 vnt_fb_opt1[FB_RATE1][current_rate - RATE_18M];
 935
 936                         fb_option = AUTO_FB_1;
 937                 }
 938         }
 939
 940         tx_context->fb_option = fb_option;
 941
 942         duration_id = vnt_generate_tx_parameter(tx_context, tx_buffer, &mic_hdr,
 943                                                 need_mic, need_rts);
 944
 945         tx_header_size = tx_context->tx_hdr_size;
 946         if (!tx_header_size) {
 947                 tx_context->in_use = false;
 948                 return -ENOMEM;
 949         }
 950
 951         tx_buffer_head->frag_ctl |= cpu_to_le16(FRAGCTL_NONFRAG);
 952
 953         tx_bytes = tx_header_size + tx_body_size;
 954
 955         memcpy(tx_context->hdr, skb->data, tx_body_size);
 956
 957         hdr->duration_id = cpu_to_le16(duration_id);
 958
 959         if (info->control.hw_key) {
 960                 tx_key = info->control.hw_key;
 961                 if (tx_key->keylen > 0)
 962                         vnt_fill_txkey(tx_context, tx_buffer_head->tx_key,
 963                                 tx_key, skb, tx_body_size, mic_hdr);
 964         }
 965
 966         priv->seq_counter = (le16_to_cpu(hdr->seq_ctrl) &
 967                                                 IEEE80211_SCTL_SEQ) >> 4;
 968
 969         tx_buffer->tx_byte_count = cpu_to_le16(tx_bytes);
 970         tx_buffer->pkt_no = tx_context->pkt_no;
 971         tx_buffer->type = 0x00;
 972
 973         tx_bytes += 4;
 974
 975         tx_context->type = CONTEXT_DATA_PACKET;
 976         tx_context->buf_len = tx_bytes;
 977
 978         spin_lock_irqsave(&priv->lock, flags);
 979
 980         if (vnt_tx_context(priv, tx_context) != STATUS_PENDING) {
 981                 spin_unlock_irqrestore(&priv->lock, flags);
 982                 return -EIO;
 983         }
 984
 985         spin_unlock_irqrestore(&priv->lock, flags);
 986
 987         return 0;
 988 }
 989
 990 static int vnt_beacon_xmit(struct vnt_private *priv,
 991         struct sk_buff *skb)
 992 {
 993         struct vnt_beacon_buffer *beacon_buffer;
 994         struct vnt_tx_short_buf_head *short_head;
 995         struct ieee80211_tx_info *info;
 996         struct vnt_usb_send_context *context;
 997         struct ieee80211_mgmt *mgmt_hdr;
 998         unsigned long flags;
 999         u32 frame_size = skb->len + 4;
1000         u16 current_rate, count;
1001
1002         spin_lock_irqsave(&priv->lock, flags);
1003
1004         context = vnt_get_free_context(priv);
1005         if (!context) {
1006                 dev_dbg(&priv->usb->dev, "%s No free context!\n", __func__);
1007                 spin_unlock_irqrestore(&priv->lock, flags);
1008                 return -ENOMEM;
1009         }
1010
1011         context->skb = skb;
1012
1013         spin_unlock_irqrestore(&priv->lock, flags);
1014
1015         beacon_buffer = (struct vnt_beacon_buffer *)&context->data[0];
1016         short_head = &beacon_buffer->short_head;
1017
1018         if (priv->bb_type == BB_TYPE_11A) {
1019                 current_rate = RATE_6M;
1020
1021                 /* Get SignalField,ServiceField,Length */
1022                 vnt_get_phy_field(priv, frame_size, current_rate,
1023                         PK_TYPE_11A, &short_head->ab);
1024
1025                 /* Get Duration and TimeStampOff */
1026                 short_head->duration = vnt_get_duration_le(priv,
1027                                                         PK_TYPE_11A, false);
1028                 short_head->time_stamp_off =
1029                                 vnt_time_stamp_off(priv, current_rate);
1030         } else {
1031                 current_rate = RATE_1M;
1032                 short_head->fifo_ctl |= cpu_to_le16(FIFOCTL_11B);
1033
1034                 /* Get SignalField,ServiceField,Length */
1035                 vnt_get_phy_field(priv, frame_size, current_rate,
1036                                         PK_TYPE_11B, &short_head->ab);
1037
1038                 /* Get Duration and TimeStampOff */
1039                 short_head->duration = vnt_get_duration_le(priv,
1040                                                 PK_TYPE_11B, false);
1041                 short_head->time_stamp_off =
1042                         vnt_time_stamp_off(priv, current_rate);
1043         }
1044
1045         /* Generate Beacon Header */
1046         mgmt_hdr = &beacon_buffer->mgmt_hdr;
1047         memcpy(mgmt_hdr, skb->data, skb->len);
1048
1049         /* time stamp always 0 */
1050         mgmt_hdr->u.beacon.timestamp = 0;
1051
1052         info = IEEE80211_SKB_CB(skb);
1053         if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) {
1054                 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)mgmt_hdr;
1055
1056                 hdr->duration_id = 0;
1057                 hdr->seq_ctrl = cpu_to_le16(priv->seq_counter << 4);
1058         }
1059
1060         priv->seq_counter++;
1061         if (priv->seq_counter > 0x0fff)
1062                 priv->seq_counter = 0;
1063
1064         count = sizeof(struct vnt_tx_short_buf_head) + skb->len;
1065
1066         beacon_buffer->tx_byte_count = cpu_to_le16(count);
1067         beacon_buffer->pkt_no = context->pkt_no;
1068         beacon_buffer->type = 0x01;
1069
1070         context->type = CONTEXT_BEACON_PACKET;
1071         context->buf_len = count + 4; /* USB header */
1072
1073         spin_lock_irqsave(&priv->lock, flags);
1074
1075         if (vnt_tx_context(priv, context) != STATUS_PENDING)
1076                 ieee80211_free_txskb(priv->hw, context->skb);
1077
1078         spin_unlock_irqrestore(&priv->lock, flags);
1079
1080         return 0;
1081 }
1082
1083 int vnt_beacon_make(struct vnt_private *priv, struct ieee80211_vif *vif)
1084 {
1085         struct sk_buff *beacon;
1086
1087         beacon = ieee80211_beacon_get(priv->hw, vif);
1088         if (!beacon)
1089                 return -ENOMEM;
1090
1091         if (vnt_beacon_xmit(priv, beacon)) {
1092                 ieee80211_free_txskb(priv->hw, beacon);
1093                 return -ENODEV;
1094         }
1095
1096         return 0;
1097 }
1098
1099 int vnt_beacon_enable(struct vnt_private *priv, struct ieee80211_vif *vif,
1100         struct ieee80211_bss_conf *conf)
1101 {
1102         vnt_mac_reg_bits_off(priv, MAC_REG_TCR, TCR_AUTOBCNTX);
1103
1104         vnt_mac_reg_bits_off(priv, MAC_REG_TFTCTL, TFTCTL_TSFCNTREN);
1105
1106         vnt_mac_set_beacon_interval(priv, conf->beacon_int);
1107
1108         vnt_clear_current_tsf(priv);
1109
1110         vnt_mac_reg_bits_on(priv, MAC_REG_TFTCTL, TFTCTL_TSFCNTREN);
1111
1112         vnt_reset_next_tbtt(priv, conf->beacon_int);
1113
1114         return vnt_beacon_make(priv, vif);
1115 }