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                 ieee80211_stop_queues(priv->hw);
 108         }
 109
 110         return NULL;
 111 }
 112
 113 static __le16 vnt_time_stamp_off(struct vnt_private *priv, u16 rate)
 114 {
 115         return cpu_to_le16(vnt_time_stampoff[priv->preamble_type % 2]
 116                                                         [rate % MAX_RATE]);
 117 }
 118
 119 static u32 vnt_get_rsvtime(struct vnt_private *priv, u8 pkt_type,
 120         u32 frame_length, u16 rate, int need_ack)
 121 {
 122         u32 data_time, ack_time;
 123
 124         data_time = vnt_get_frame_time(priv->preamble_type, pkt_type,
 125                                                         frame_length, rate);
 126
 127         if (pkt_type == PK_TYPE_11B)
 128                 ack_time = vnt_get_frame_time(priv->preamble_type, pkt_type,
 129                                         14, (u16)priv->top_cck_basic_rate);
 130         else
 131                 ack_time = vnt_get_frame_time(priv->preamble_type, pkt_type,
 132                                         14, (u16)priv->top_ofdm_basic_rate);
 133
 134         if (need_ack)
 135                 return data_time + priv->sifs + ack_time;
 136
 137         return data_time;
 138 }
 139
 140 static __le16 vnt_rxtx_rsvtime_le16(struct vnt_private *priv, u8 pkt_type,
 141         u32 frame_length, u16 rate, int need_ack)
 142 {
 143         return cpu_to_le16((u16)vnt_get_rsvtime(priv, pkt_type,
 144                 frame_length, rate, need_ack));
 145 }
 146
 147 static __le16 vnt_get_rtscts_rsvtime_le(struct vnt_private *priv,
 148         u8 rsv_type, u8 pkt_type, u32 frame_length, u16 current_rate)
 149 {
 150         u32 rrv_time, rts_time, cts_time, ack_time, data_time;
 151
 152         rrv_time = rts_time = cts_time = ack_time = data_time = 0;
 153
 154         data_time = vnt_get_frame_time(priv->preamble_type, pkt_type,
 155                                                 frame_length, current_rate);
 156
 157         if (rsv_type == 0) {
 158                 rts_time = vnt_get_frame_time(priv->preamble_type,
 159                         pkt_type, 20, priv->top_cck_basic_rate);
 160                 cts_time = ack_time = vnt_get_frame_time(priv->preamble_type,
 161                         pkt_type, 14, priv->top_cck_basic_rate);
 162         } else if (rsv_type == 1) {
 163                 rts_time = vnt_get_frame_time(priv->preamble_type,
 164                         pkt_type, 20, priv->top_cck_basic_rate);
 165                 cts_time = vnt_get_frame_time(priv->preamble_type, pkt_type,
 166                         14, priv->top_cck_basic_rate);
 167                 ack_time = vnt_get_frame_time(priv->preamble_type, pkt_type,
 168                         14, priv->top_ofdm_basic_rate);
 169         } else if (rsv_type == 2) {
 170                 rts_time = vnt_get_frame_time(priv->preamble_type, pkt_type,
 171                         20, priv->top_ofdm_basic_rate);
 172                 cts_time = ack_time = vnt_get_frame_time(priv->preamble_type,
 173                         pkt_type, 14, priv->top_ofdm_basic_rate);
 174         } else if (rsv_type == 3) {
 175                 cts_time = vnt_get_frame_time(priv->preamble_type, pkt_type,
 176                         14, priv->top_cck_basic_rate);
 177                 ack_time = vnt_get_frame_time(priv->preamble_type, pkt_type,
 178                         14, priv->top_ofdm_basic_rate);
 179
 180                 rrv_time = cts_time + ack_time + data_time + 2 * priv->sifs;
 181
 182                 return cpu_to_le16((u16)rrv_time);
 183         }
 184
 185         rrv_time = rts_time + cts_time + ack_time + data_time + 3 * priv->sifs;
 186
 187         return cpu_to_le16((u16)rrv_time);
 188 }
 189
 190 static __le16 vnt_get_duration_le(struct vnt_private *priv,
 191                                         u8 pkt_type, int need_ack)
 192 {
 193         u32 ack_time = 0;
 194
 195         if (need_ack) {
 196                 if (pkt_type == PK_TYPE_11B)
 197                         ack_time = vnt_get_frame_time(priv->preamble_type,
 198                                 pkt_type, 14, priv->top_cck_basic_rate);
 199                 else
 200                         ack_time = vnt_get_frame_time(priv->preamble_type,
 201                                 pkt_type, 14, priv->top_ofdm_basic_rate);
 202
 203                 return cpu_to_le16((u16)(priv->sifs + ack_time));
 204         }
 205
 206         return 0;
 207 }
 208
 209 static __le16 vnt_get_rtscts_duration_le(struct vnt_usb_send_context *context,
 210                                          u8 dur_type, u8 pkt_type, u16 rate)
 211 {
 212         struct vnt_private *priv = context->priv;
 213         u32 cts_time = 0, dur_time = 0;
 214         u32 frame_length = context->frame_len;
 215         u8 need_ack = context->need_ack;
 216
 217         switch (dur_type) {
 218         case RTSDUR_BB:
 219         case RTSDUR_BA:
 220         case RTSDUR_BA_F0:
 221         case RTSDUR_BA_F1:
 222                 cts_time = vnt_get_frame_time(priv->preamble_type,
 223                                 pkt_type, 14, priv->top_cck_basic_rate);
 224                 dur_time = cts_time + 2 * priv->sifs +
 225                         vnt_get_rsvtime(priv, pkt_type,
 226                                                 frame_length, rate, need_ack);
 227                 break;
 228
 229         case RTSDUR_AA:
 230         case RTSDUR_AA_F0:
 231         case RTSDUR_AA_F1:
 232                 cts_time = vnt_get_frame_time(priv->preamble_type,
 233                                 pkt_type, 14, priv->top_ofdm_basic_rate);
 234                 dur_time = cts_time + 2 * priv->sifs +
 235                         vnt_get_rsvtime(priv, pkt_type,
 236                                                 frame_length, rate, need_ack);
 237                 break;
 238
 239         case CTSDUR_BA:
 240         case CTSDUR_BA_F0:
 241         case CTSDUR_BA_F1:
 242                 dur_time = priv->sifs + vnt_get_rsvtime(priv,
 243                                 pkt_type, frame_length, rate, need_ack);
 244                 break;
 245
 246         default:
 247                 break;
 248         }
 249
 250         return cpu_to_le16((u16)dur_time);
 251 }
 252
 253 static u16 vnt_mac_hdr_pos(struct vnt_usb_send_context *tx_context,
 254         struct ieee80211_hdr *hdr)
 255 {
 256         u8 *head = tx_context->data + offsetof(struct vnt_tx_buffer, fifo_head);
 257         u8 *hdr_pos = (u8 *)hdr;
 258
 259         tx_context->hdr = hdr;
 260         if (!tx_context->hdr)
 261                 return 0;
 262
 263         return (u16)(hdr_pos - head);
 264 }
 265
 266 static u16 vnt_rxtx_datahead_g(struct vnt_usb_send_context *tx_context,
 267                                struct vnt_tx_datahead_g *buf)
 268 {
 269
 270         struct vnt_private *priv = tx_context->priv;
 271         struct ieee80211_hdr *hdr =
 272                                 (struct ieee80211_hdr *)tx_context->skb->data;
 273         u32 frame_len = tx_context->frame_len;
 274         u16 rate = tx_context->tx_rate;
 275         u8 need_ack = tx_context->need_ack;
 276
 277         /* Get SignalField,ServiceField,Length */
 278         vnt_get_phy_field(priv, frame_len, rate, tx_context->pkt_type, &buf->a);
 279         vnt_get_phy_field(priv, frame_len, priv->top_cck_basic_rate,
 280                                                         PK_TYPE_11B, &buf->b);
 281
 282         /* Get Duration and TimeStamp */
 283         if (ieee80211_is_nullfunc(hdr->frame_control)) {
 284                 buf->duration_a = hdr->duration_id;
 285                 buf->duration_b = hdr->duration_id;
 286         } else {
 287                 buf->duration_a = vnt_get_duration_le(priv,
 288                                                 tx_context->pkt_type, need_ack);
 289                 buf->duration_b = vnt_get_duration_le(priv,
 290                                                         PK_TYPE_11B, need_ack);
 291         }
 292
 293         buf->time_stamp_off_a = vnt_time_stamp_off(priv, rate);
 294         buf->time_stamp_off_b = vnt_time_stamp_off(priv,
 295                                         priv->top_cck_basic_rate);
 296
 297         tx_context->tx_hdr_size = vnt_mac_hdr_pos(tx_context, &buf->hdr);
 298
 299         return le16_to_cpu(buf->duration_a);
 300 }
 301
 302 static u16 vnt_rxtx_datahead_g_fb(struct vnt_usb_send_context *tx_context,
 303                                   struct vnt_tx_datahead_g_fb *buf)
 304 {
 305         struct vnt_private *priv = tx_context->priv;
 306         u32 frame_len = tx_context->frame_len;
 307         u16 rate = tx_context->tx_rate;
 308         u8 need_ack = tx_context->need_ack;
 309
 310         /* Get SignalField,ServiceField,Length */
 311         vnt_get_phy_field(priv, frame_len, rate, tx_context->pkt_type, &buf->a);
 312
 313         vnt_get_phy_field(priv, frame_len, priv->top_cck_basic_rate,
 314                                                 PK_TYPE_11B, &buf->b);
 315
 316         /* Get Duration and TimeStamp */
 317         buf->duration_a = vnt_get_duration_le(priv, tx_context->pkt_type,
 318                                               need_ack);
 319         buf->duration_b = vnt_get_duration_le(priv, PK_TYPE_11B, need_ack);
 320
 321         buf->duration_a_f0 = vnt_get_duration_le(priv, tx_context->pkt_type,
 322                                                  need_ack);
 323         buf->duration_a_f1 = vnt_get_duration_le(priv, tx_context->pkt_type,
 324                                                  need_ack);
 325
 326         buf->time_stamp_off_a = vnt_time_stamp_off(priv, rate);
 327         buf->time_stamp_off_b = vnt_time_stamp_off(priv,
 328                                                 priv->top_cck_basic_rate);
 329
 330         tx_context->tx_hdr_size = vnt_mac_hdr_pos(tx_context, &buf->hdr);
 331
 332         return le16_to_cpu(buf->duration_a);
 333 }
 334
 335 static u16 vnt_rxtx_datahead_a_fb(struct vnt_usb_send_context *tx_context,
 336                                   struct vnt_tx_datahead_a_fb *buf)
 337 {
 338         struct vnt_private *priv = tx_context->priv;
 339         u16 rate = tx_context->tx_rate;
 340         u8 pkt_type = tx_context->pkt_type;
 341         u8 need_ack = tx_context->need_ack;
 342         u32 frame_len = tx_context->frame_len;
 343
 344         /* Get SignalField,ServiceField,Length */
 345         vnt_get_phy_field(priv, frame_len, rate, pkt_type, &buf->a);
 346         /* Get Duration and TimeStampOff */
 347         buf->duration = vnt_get_duration_le(priv, pkt_type, need_ack);
 348
 349         buf->duration_f0 = vnt_get_duration_le(priv, pkt_type, need_ack);
 350         buf->duration_f1 = vnt_get_duration_le(priv, pkt_type, need_ack);
 351
 352         buf->time_stamp_off = vnt_time_stamp_off(priv, rate);
 353
 354         tx_context->tx_hdr_size = vnt_mac_hdr_pos(tx_context, &buf->hdr);
 355
 356         return le16_to_cpu(buf->duration);
 357 }
 358
 359 static u16 vnt_rxtx_datahead_ab(struct vnt_usb_send_context *tx_context,
 360                                 struct vnt_tx_datahead_ab *buf)
 361 {
 362         struct vnt_private *priv = tx_context->priv;
 363         struct ieee80211_hdr *hdr =
 364                                 (struct ieee80211_hdr *)tx_context->skb->data;
 365         u32 frame_len = tx_context->frame_len;
 366         u16 rate = tx_context->tx_rate;
 367         u8 need_ack = tx_context->need_ack;
 368
 369         /* Get SignalField,ServiceField,Length */
 370         vnt_get_phy_field(priv, frame_len, rate,
 371                           tx_context->pkt_type, &buf->ab);
 372
 373         /* Get Duration and TimeStampOff */
 374         if (ieee80211_is_nullfunc(hdr->frame_control)) {
 375                 buf->duration = hdr->duration_id;
 376         } else {
 377                 buf->duration = vnt_get_duration_le(priv, tx_context->pkt_type,
 378                                                     need_ack);
 379         }
 380
 381         buf->time_stamp_off = vnt_time_stamp_off(priv, rate);
 382
 383         tx_context->tx_hdr_size = vnt_mac_hdr_pos(tx_context, &buf->hdr);
 384
 385         return le16_to_cpu(buf->duration);
 386 }
 387
 388 static int vnt_fill_ieee80211_rts(struct vnt_usb_send_context *tx_context,
 389         struct ieee80211_rts *rts, __le16 duration)
 390 {
 391         struct ieee80211_hdr *hdr =
 392                                 (struct ieee80211_hdr *)tx_context->skb->data;
 393
 394         rts->duration = duration;
 395         rts->frame_control =
 396                 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
 397
 398         ether_addr_copy(rts->ra, hdr->addr1);
 399         ether_addr_copy(rts->ta, hdr->addr2);
 400
 401         return 0;
 402 }
 403
 404 static u16 vnt_rxtx_rts_g_head(struct vnt_usb_send_context *tx_context,
 405                                struct vnt_rts_g *buf)
 406 {
 407         struct vnt_private *priv = tx_context->priv;
 408         u16 rts_frame_len = 20;
 409         u16 current_rate = tx_context->tx_rate;
 410
 411         vnt_get_phy_field(priv, rts_frame_len, priv->top_cck_basic_rate,
 412                 PK_TYPE_11B, &buf->b);
 413         vnt_get_phy_field(priv, rts_frame_len, priv->top_ofdm_basic_rate,
 414                           tx_context->pkt_type, &buf->a);
 415
 416         buf->duration_bb = vnt_get_rtscts_duration_le(tx_context, RTSDUR_BB,
 417                                                       PK_TYPE_11B,
 418                                                       priv->top_cck_basic_rate);
 419         buf->duration_aa = vnt_get_rtscts_duration_le(tx_context, RTSDUR_AA,
 420                                                       tx_context->pkt_type,
 421                                                       current_rate);
 422         buf->duration_ba = vnt_get_rtscts_duration_le(tx_context, RTSDUR_BA,
 423                                                       tx_context->pkt_type,
 424                                                       current_rate);
 425
 426         vnt_fill_ieee80211_rts(tx_context, &buf->data, buf->duration_aa);
 427
 428         return vnt_rxtx_datahead_g(tx_context, &buf->data_head);
 429 }
 430
 431 static u16 vnt_rxtx_rts_g_fb_head(struct vnt_usb_send_context *tx_context,
 432                                   struct vnt_rts_g_fb *buf)
 433 {
 434         struct vnt_private *priv = tx_context->priv;
 435         u16 current_rate = tx_context->tx_rate;
 436         u16 rts_frame_len = 20;
 437
 438         vnt_get_phy_field(priv, rts_frame_len, priv->top_cck_basic_rate,
 439                 PK_TYPE_11B, &buf->b);
 440         vnt_get_phy_field(priv, rts_frame_len, priv->top_ofdm_basic_rate,
 441                           tx_context->pkt_type, &buf->a);
 442
 443         buf->duration_bb = vnt_get_rtscts_duration_le(tx_context, RTSDUR_BB,
 444                                                       PK_TYPE_11B,
 445                                                       priv->top_cck_basic_rate);
 446         buf->duration_aa = vnt_get_rtscts_duration_le(tx_context, RTSDUR_AA,
 447                                                       tx_context->pkt_type,
 448                                                       current_rate);
 449         buf->duration_ba = vnt_get_rtscts_duration_le(tx_context, RTSDUR_BA,
 450                                                       tx_context->pkt_type,
 451                                                       current_rate);
 452
 453         buf->rts_duration_ba_f0 =
 454                 vnt_get_rtscts_duration_le(tx_context, RTSDUR_BA_F0,
 455                                            tx_context->pkt_type,
 456                                            priv->tx_rate_fb0);
 457         buf->rts_duration_aa_f0 =
 458                 vnt_get_rtscts_duration_le(tx_context, RTSDUR_AA_F0,
 459                                            tx_context->pkt_type,
 460                                            priv->tx_rate_fb0);
 461         buf->rts_duration_ba_f1 =
 462                 vnt_get_rtscts_duration_le(tx_context, RTSDUR_BA_F1,
 463                                            tx_context->pkt_type,
 464                                            priv->tx_rate_fb1);
 465         buf->rts_duration_aa_f1 =
 466                 vnt_get_rtscts_duration_le(tx_context, RTSDUR_AA_F1,
 467                                            tx_context->pkt_type,
 468                                            priv->tx_rate_fb1);
 469
 470         vnt_fill_ieee80211_rts(tx_context, &buf->data, buf->duration_aa);
 471
 472         return vnt_rxtx_datahead_g_fb(tx_context, &buf->data_head);
 473 }
 474
 475 static u16 vnt_rxtx_rts_ab_head(struct vnt_usb_send_context *tx_context,
 476                                 struct vnt_rts_ab *buf)
 477 {
 478         struct vnt_private *priv = tx_context->priv;
 479         u16 current_rate = tx_context->tx_rate;
 480         u16 rts_frame_len = 20;
 481
 482         vnt_get_phy_field(priv, rts_frame_len, priv->top_ofdm_basic_rate,
 483                           tx_context->pkt_type, &buf->ab);
 484
 485         buf->duration = vnt_get_rtscts_duration_le(tx_context, RTSDUR_AA,
 486                                                    tx_context->pkt_type,
 487                                                    current_rate);
 488
 489         vnt_fill_ieee80211_rts(tx_context, &buf->data, buf->duration);
 490
 491         return vnt_rxtx_datahead_ab(tx_context, &buf->data_head);
 492 }
 493
 494 static u16 vnt_rxtx_rts_a_fb_head(struct vnt_usb_send_context *tx_context,
 495                                   struct vnt_rts_a_fb *buf)
 496 {
 497         struct vnt_private *priv = tx_context->priv;
 498         u16 current_rate = tx_context->tx_rate;
 499         u16 rts_frame_len = 20;
 500
 501         vnt_get_phy_field(priv, rts_frame_len,
 502                 priv->top_ofdm_basic_rate, tx_context->pkt_type, &buf->a);
 503
 504         buf->duration = vnt_get_rtscts_duration_le(tx_context, RTSDUR_AA,
 505                                                    tx_context->pkt_type,
 506                                                    current_rate);
 507
 508         buf->rts_duration_f0 =
 509                 vnt_get_rtscts_duration_le(tx_context, RTSDUR_AA_F0,
 510                                            tx_context->pkt_type,
 511                                            priv->tx_rate_fb0);
 512
 513         buf->rts_duration_f1 =
 514                 vnt_get_rtscts_duration_le(tx_context, RTSDUR_AA_F1,
 515                                            tx_context->pkt_type,
 516                                            priv->tx_rate_fb1);
 517
 518         vnt_fill_ieee80211_rts(tx_context, &buf->data, buf->duration);
 519
 520         return vnt_rxtx_datahead_a_fb(tx_context, &buf->data_head);
 521 }
 522
 523 static u16 vnt_fill_cts_fb_head(struct vnt_usb_send_context *tx_context,
 524                                 union vnt_tx_data_head *head)
 525 {
 526         struct vnt_private *priv = tx_context->priv;
 527         struct vnt_cts_fb *buf = &head->cts_g_fb;
 528         u32 cts_frame_len = 14;
 529         u16 current_rate = tx_context->tx_rate;
 530
 531         /* Get SignalField,ServiceField,Length */
 532         vnt_get_phy_field(priv, cts_frame_len, priv->top_cck_basic_rate,
 533                           PK_TYPE_11B, &buf->b);
 534
 535         buf->duration_ba =
 536                 vnt_get_rtscts_duration_le(tx_context, CTSDUR_BA,
 537                                            tx_context->pkt_type,
 538                                            current_rate);
 539         /* Get CTSDuration_ba_f0 */
 540         buf->cts_duration_ba_f0 =
 541                 vnt_get_rtscts_duration_le(tx_context, CTSDUR_BA_F0,
 542                                            tx_context->pkt_type,
 543                                            priv->tx_rate_fb0);
 544         /* Get CTSDuration_ba_f1 */
 545         buf->cts_duration_ba_f1 =
 546                 vnt_get_rtscts_duration_le(tx_context, CTSDUR_BA_F1,
 547                                            tx_context->pkt_type,
 548                                            priv->tx_rate_fb1);
 549         /* Get CTS Frame body */
 550         buf->data.duration = buf->duration_ba;
 551         buf->data.frame_control =
 552                 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
 553
 554         ether_addr_copy(buf->data.ra, priv->current_net_addr);
 555
 556         return vnt_rxtx_datahead_g_fb(tx_context, &buf->data_head);
 557 }
 558
 559 static u16 vnt_fill_cts_head(struct vnt_usb_send_context *tx_context,
 560                              union vnt_tx_data_head *head)
 561 {
 562         struct vnt_private *priv = tx_context->priv;
 563         struct vnt_cts *buf = &head->cts_g;
 564         u32 cts_frame_len = 14;
 565         u16 current_rate = tx_context->tx_rate;
 566
 567         /* Get SignalField,ServiceField,Length */
 568         vnt_get_phy_field(priv, cts_frame_len, priv->top_cck_basic_rate,
 569                           PK_TYPE_11B, &buf->b);
 570         /* Get CTSDuration_ba */
 571         buf->duration_ba =
 572                 vnt_get_rtscts_duration_le(tx_context, CTSDUR_BA,
 573                                            tx_context->pkt_type,
 574                                            current_rate);
 575         /*Get CTS Frame body*/
 576         buf->data.duration = buf->duration_ba;
 577         buf->data.frame_control =
 578                 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
 579
 580         ether_addr_copy(buf->data.ra, priv->current_net_addr);
 581
 582         return vnt_rxtx_datahead_g(tx_context, &buf->data_head);
 583 }
 584
 585 static u16 vnt_rxtx_rts(struct vnt_usb_send_context *tx_context,
 586                         union vnt_tx_head *tx_head, bool need_mic)
 587 {
 588         struct vnt_private *priv = tx_context->priv;
 589         struct vnt_rrv_time_rts *buf = &tx_head->tx_rts.rts;
 590         union vnt_tx_data_head *head = &tx_head->tx_rts.tx.head;
 591         u32 frame_len = tx_context->frame_len;
 592         u16 current_rate = tx_context->tx_rate;
 593         u8 need_ack = tx_context->need_ack;
 594
 595         buf->rts_rrv_time_aa = vnt_get_rtscts_rsvtime_le(priv, 2,
 596                         tx_context->pkt_type, frame_len, current_rate);
 597         buf->rts_rrv_time_ba = vnt_get_rtscts_rsvtime_le(priv, 1,
 598                         tx_context->pkt_type, frame_len, current_rate);
 599         buf->rts_rrv_time_bb = vnt_get_rtscts_rsvtime_le(priv, 0,
 600                         tx_context->pkt_type, frame_len, current_rate);
 601
 602         buf->rrv_time_a = vnt_rxtx_rsvtime_le16(priv, tx_context->pkt_type,
 603                                                 frame_len, current_rate,
 604                                                 need_ack);
 605         buf->rrv_time_b = vnt_rxtx_rsvtime_le16(priv, PK_TYPE_11B, frame_len,
 606                                         priv->top_cck_basic_rate, need_ack);
 607
 608         if (need_mic)
 609                 head = &tx_head->tx_rts.tx.mic.head;
 610
 611         if (tx_context->fb_option)
 612                 return vnt_rxtx_rts_g_fb_head(tx_context, &head->rts_g_fb);
 613
 614         return vnt_rxtx_rts_g_head(tx_context, &head->rts_g);
 615 }
 616
 617 static u16 vnt_rxtx_cts(struct vnt_usb_send_context *tx_context,
 618                         union vnt_tx_head *tx_head, bool need_mic)
 619 {
 620         struct vnt_private *priv = tx_context->priv;
 621         struct vnt_rrv_time_cts *buf = &tx_head->tx_cts.cts;
 622         union vnt_tx_data_head *head = &tx_head->tx_cts.tx.head;
 623         u32 frame_len = tx_context->frame_len;
 624         u16 current_rate = tx_context->tx_rate;
 625         u8 need_ack = tx_context->need_ack;
 626
 627         buf->rrv_time_a = vnt_rxtx_rsvtime_le16(priv, tx_context->pkt_type,
 628                                         frame_len, current_rate, need_ack);
 629         buf->rrv_time_b = vnt_rxtx_rsvtime_le16(priv, PK_TYPE_11B,
 630                                 frame_len, priv->top_cck_basic_rate, need_ack);
 631
 632         buf->cts_rrv_time_ba = vnt_get_rtscts_rsvtime_le(priv, 3,
 633                         tx_context->pkt_type, frame_len, current_rate);
 634
 635         if (need_mic)
 636                 head = &tx_head->tx_cts.tx.mic.head;
 637
 638         /* Fill CTS */
 639         if (tx_context->fb_option)
 640                 return vnt_fill_cts_fb_head(tx_context, head);
 641
 642         return vnt_fill_cts_head(tx_context, head);
 643 }
 644
 645 static u16 vnt_rxtx_ab(struct vnt_usb_send_context *tx_context,
 646                        union vnt_tx_head *tx_head, bool need_rts, bool need_mic)
 647 {
 648         struct vnt_private *priv = tx_context->priv;
 649         struct vnt_rrv_time_ab *buf = &tx_head->tx_ab.ab;
 650         union vnt_tx_data_head *head = &tx_head->tx_ab.tx.head;
 651         u32 frame_len = tx_context->frame_len;
 652         u16 current_rate = tx_context->tx_rate;
 653         u8 need_ack = tx_context->need_ack;
 654
 655         buf->rrv_time = vnt_rxtx_rsvtime_le16(priv, tx_context->pkt_type,
 656                         frame_len, current_rate, need_ack);
 657
 658         if (need_mic)
 659                 head = &tx_head->tx_ab.tx.mic.head;
 660
 661         if (need_rts) {
 662                 if (tx_context->pkt_type == PK_TYPE_11B)
 663                         buf->rts_rrv_time = vnt_get_rtscts_rsvtime_le(priv, 0,
 664                                 tx_context->pkt_type, frame_len, current_rate);
 665                 else /* PK_TYPE_11A */
 666                         buf->rts_rrv_time = vnt_get_rtscts_rsvtime_le(priv, 2,
 667                                 tx_context->pkt_type, frame_len, current_rate);
 668
 669                 if (tx_context->fb_option &&
 670                     tx_context->pkt_type == PK_TYPE_11A)
 671                         return vnt_rxtx_rts_a_fb_head(tx_context,
 672                                                       &head->rts_a_fb);
 673
 674                 return vnt_rxtx_rts_ab_head(tx_context, &head->rts_ab);
 675         }
 676
 677         if (tx_context->pkt_type == PK_TYPE_11A)
 678                 return vnt_rxtx_datahead_a_fb(tx_context,
 679                                               &head->data_head_a_fb);
 680
 681         return vnt_rxtx_datahead_ab(tx_context, &head->data_head_ab);
 682 }
 683
 684 static u16 vnt_generate_tx_parameter(struct vnt_usb_send_context *tx_context,
 685         struct vnt_tx_buffer *tx_buffer,
 686         struct vnt_mic_hdr **mic_hdr, u32 need_mic,
 687         bool need_rts)
 688 {
 689
 690         if (tx_context->pkt_type == PK_TYPE_11GB ||
 691             tx_context->pkt_type == PK_TYPE_11GA) {
 692                 if (need_rts) {
 693                         if (need_mic)
 694                                 *mic_hdr = &tx_buffer->
 695                                                 tx_head.tx_rts.tx.mic.hdr;
 696
 697                         return vnt_rxtx_rts(tx_context, &tx_buffer->tx_head,
 698                                             need_mic);
 699                 }
 700
 701                 if (need_mic)
 702                         *mic_hdr = &tx_buffer->tx_head.tx_cts.tx.mic.hdr;
 703
 704                 return vnt_rxtx_cts(tx_context, &tx_buffer->tx_head, need_mic);
 705         }
 706
 707         if (need_mic)
 708                 *mic_hdr = &tx_buffer->tx_head.tx_ab.tx.mic.hdr;
 709
 710         return vnt_rxtx_ab(tx_context, &tx_buffer->tx_head, need_rts, need_mic);
 711 }
 712
 713 static void vnt_fill_txkey(struct vnt_usb_send_context *tx_context,
 714         u8 *key_buffer, struct ieee80211_key_conf *tx_key, struct sk_buff *skb,
 715         u16 payload_len, struct vnt_mic_hdr *mic_hdr)
 716 {
 717         struct ieee80211_hdr *hdr = tx_context->hdr;
 718         struct ieee80211_key_seq seq;
 719         u8 *iv = ((u8 *)hdr + ieee80211_get_hdrlen_from_skb(skb));
 720
 721         /* strip header and icv len from payload */
 722         payload_len -= ieee80211_get_hdrlen_from_skb(skb);
 723         payload_len -= tx_key->icv_len;
 724
 725         switch (tx_key->cipher) {
 726         case WLAN_CIPHER_SUITE_WEP40:
 727         case WLAN_CIPHER_SUITE_WEP104:
 728                 memcpy(key_buffer, iv, 3);
 729                 memcpy(key_buffer + 3, tx_key->key, tx_key->keylen);
 730
 731                 if (tx_key->keylen == WLAN_KEY_LEN_WEP40) {
 732                         memcpy(key_buffer + 8, iv, 3);
 733                         memcpy(key_buffer + 11,
 734                                         tx_key->key, WLAN_KEY_LEN_WEP40);
 735                 }
 736
 737                 break;
 738         case WLAN_CIPHER_SUITE_TKIP:
 739                 ieee80211_get_tkip_p2k(tx_key, skb, key_buffer);
 740
 741                 break;
 742         case WLAN_CIPHER_SUITE_CCMP:
 743
 744                 if (!mic_hdr)
 745                         return;
 746
 747                 mic_hdr->id = 0x59;
 748                 mic_hdr->payload_len = cpu_to_be16(payload_len);
 749                 ether_addr_copy(mic_hdr->mic_addr2, hdr->addr2);
 750
 751                 ieee80211_get_key_tx_seq(tx_key, &seq);
 752
 753                 memcpy(mic_hdr->ccmp_pn, seq.ccmp.pn, IEEE80211_CCMP_PN_LEN);
 754
 755                 if (ieee80211_has_a4(hdr->frame_control))
 756                         mic_hdr->hlen = cpu_to_be16(28);
 757                 else
 758                         mic_hdr->hlen = cpu_to_be16(22);
 759
 760                 ether_addr_copy(mic_hdr->addr1, hdr->addr1);
 761                 ether_addr_copy(mic_hdr->addr2, hdr->addr2);
 762                 ether_addr_copy(mic_hdr->addr3, hdr->addr3);
 763
 764                 mic_hdr->frame_control = cpu_to_le16(
 765                         le16_to_cpu(hdr->frame_control) & 0xc78f);
 766                 mic_hdr->seq_ctrl = cpu_to_le16(
 767                                 le16_to_cpu(hdr->seq_ctrl) & 0xf);
 768
 769                 if (ieee80211_has_a4(hdr->frame_control))
 770                         ether_addr_copy(mic_hdr->addr4, hdr->addr4);
 771
 772
 773                 memcpy(key_buffer, tx_key->key, WLAN_KEY_LEN_CCMP);
 774
 775                 break;
 776         default:
 777                 break;
 778         }
 779
 780 }
 781
 782 int vnt_tx_packet(struct vnt_private *priv, struct sk_buff *skb)
 783 {
 784         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 785         struct ieee80211_tx_rate *tx_rate = &info->control.rates[0];
 786         struct ieee80211_rate *rate;
 787         struct ieee80211_key_conf *tx_key;
 788         struct ieee80211_hdr *hdr;
 789         struct vnt_mic_hdr *mic_hdr = NULL;
 790         struct vnt_tx_buffer *tx_buffer;
 791         struct vnt_tx_fifo_head *tx_buffer_head;
 792         struct vnt_usb_send_context *tx_context;
 793         unsigned long flags;
 794         u16 tx_bytes, tx_header_size, tx_body_size, current_rate, duration_id;
 795         u8 pkt_type, fb_option = AUTO_FB_NONE;
 796         bool need_rts = false, is_pspoll = false;
 797         bool need_mic = false;
 798
 799         hdr = (struct ieee80211_hdr *)(skb->data);
 800
 801         rate = ieee80211_get_tx_rate(priv->hw, info);
 802
 803         current_rate = rate->hw_value;
 804         if (priv->current_rate != current_rate &&
 805                         !(priv->hw->conf.flags & IEEE80211_CONF_OFFCHANNEL)) {
 806                 priv->current_rate = current_rate;
 807                 vnt_schedule_command(priv, WLAN_CMD_SETPOWER);
 808         }
 809
 810         if (current_rate > RATE_11M) {
 811                 if (info->band == IEEE80211_BAND_5GHZ) {
 812                         pkt_type = PK_TYPE_11A;
 813                 } else {
 814                         if (tx_rate->flags & IEEE80211_TX_RC_USE_CTS_PROTECT) {
 815                                 if (priv->basic_rates & VNT_B_RATES)
 816                                         pkt_type = PK_TYPE_11GB;
 817                                 else
 818                                         pkt_type = PK_TYPE_11GA;
 819                         } else {
 820                                 pkt_type = PK_TYPE_11A;
 821                         }
 822                 }
 823         } else {
 824                 pkt_type = PK_TYPE_11B;
 825         }
 826
 827         spin_lock_irqsave(&priv->lock, flags);
 828
 829         tx_context = vnt_get_free_context(priv);
 830         if (!tx_context) {
 831                 dev_dbg(&priv->usb->dev, "%s No free context\n", __func__);
 832                 spin_unlock_irqrestore(&priv->lock, flags);
 833                 return -ENOMEM;
 834         }
 835
 836         tx_context->skb = skb;
 837         tx_context->pkt_type = pkt_type;
 838         tx_context->need_ack = false;
 839         tx_context->frame_len = skb->len + 4;
 840         tx_context->tx_rate = current_rate;
 841
 842         spin_unlock_irqrestore(&priv->lock, flags);
 843
 844         tx_buffer = (struct vnt_tx_buffer *)tx_context->data;
 845         tx_buffer_head = &tx_buffer->fifo_head;
 846         tx_body_size = skb->len;
 847
 848         /*Set fifo controls */
 849         if (pkt_type == PK_TYPE_11A)
 850                 tx_buffer_head->fifo_ctl = 0;
 851         else if (pkt_type == PK_TYPE_11B)
 852                 tx_buffer_head->fifo_ctl = cpu_to_le16(FIFOCTL_11B);
 853         else if (pkt_type == PK_TYPE_11GB)
 854                 tx_buffer_head->fifo_ctl = cpu_to_le16(FIFOCTL_11GB);
 855         else if (pkt_type == PK_TYPE_11GA)
 856                 tx_buffer_head->fifo_ctl = cpu_to_le16(FIFOCTL_11GA);
 857
 858         if (!ieee80211_is_data(hdr->frame_control)) {
 859                 tx_buffer_head->fifo_ctl |= cpu_to_le16(FIFOCTL_GENINT |
 860                                                         FIFOCTL_ISDMA0);
 861                 tx_buffer_head->fifo_ctl |= cpu_to_le16(FIFOCTL_TMOEN);
 862
 863                 tx_buffer_head->time_stamp =
 864                         cpu_to_le16(DEFAULT_MGN_LIFETIME_RES_64us);
 865         } else {
 866                 tx_buffer_head->time_stamp =
 867                         cpu_to_le16(DEFAULT_MSDU_LIFETIME_RES_64us);
 868         }
 869
 870         if (!(info->flags & IEEE80211_TX_CTL_NO_ACK)) {
 871                 tx_buffer_head->fifo_ctl |= cpu_to_le16(FIFOCTL_NEEDACK);
 872                 tx_context->need_ack = true;
 873         }
 874
 875         if (ieee80211_has_retry(hdr->frame_control))
 876                 tx_buffer_head->fifo_ctl |= cpu_to_le16(FIFOCTL_LRETRY);
 877
 878         if (tx_rate->flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)
 879                 priv->preamble_type = PREAMBLE_SHORT;
 880         else
 881                 priv->preamble_type = PREAMBLE_LONG;
 882
 883         if (tx_rate->flags & IEEE80211_TX_RC_USE_RTS_CTS) {
 884                 need_rts = true;
 885                 tx_buffer_head->fifo_ctl |= cpu_to_le16(FIFOCTL_RTS);
 886         }
 887
 888         if (ieee80211_has_a4(hdr->frame_control))
 889                 tx_buffer_head->fifo_ctl |= cpu_to_le16(FIFOCTL_LHEAD);
 890
 891         if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER)
 892                 is_pspoll = true;
 893
 894         tx_buffer_head->frag_ctl =
 895                         cpu_to_le16(ieee80211_get_hdrlen_from_skb(skb) << 10);
 896
 897         if (info->control.hw_key) {
 898                 tx_key = info->control.hw_key;
 899                 switch (info->control.hw_key->cipher) {
 900                 case WLAN_CIPHER_SUITE_WEP40:
 901                 case WLAN_CIPHER_SUITE_WEP104:
 902                         tx_buffer_head->frag_ctl |= cpu_to_le16(FRAGCTL_LEGACY);
 903                         break;
 904                 case WLAN_CIPHER_SUITE_TKIP:
 905                         tx_buffer_head->frag_ctl |= cpu_to_le16(FRAGCTL_TKIP);
 906                         break;
 907                 case WLAN_CIPHER_SUITE_CCMP:
 908                         tx_buffer_head->frag_ctl |= cpu_to_le16(FRAGCTL_AES);
 909                         need_mic = true;
 910                 default:
 911                         break;
 912                 }
 913                 tx_context->frame_len += tx_key->icv_len;
 914         }
 915
 916         tx_buffer_head->current_rate = cpu_to_le16(current_rate);
 917
 918         /* legacy rates TODO use ieee80211_tx_rate */
 919         if (current_rate >= RATE_18M && ieee80211_is_data(hdr->frame_control)) {
 920                 if (priv->auto_fb_ctrl == AUTO_FB_0) {
 921                         tx_buffer_head->fifo_ctl |=
 922                                                 cpu_to_le16(FIFOCTL_AUTO_FB_0);
 923
 924                         priv->tx_rate_fb0 =
 925                                 vnt_fb_opt0[FB_RATE0][current_rate - RATE_18M];
 926                         priv->tx_rate_fb1 =
 927                                 vnt_fb_opt0[FB_RATE1][current_rate - RATE_18M];
 928
 929                         fb_option = AUTO_FB_0;
 930                 } else if (priv->auto_fb_ctrl == AUTO_FB_1) {
 931                         tx_buffer_head->fifo_ctl |=
 932                                                 cpu_to_le16(FIFOCTL_AUTO_FB_1);
 933
 934                         priv->tx_rate_fb0 =
 935                                 vnt_fb_opt1[FB_RATE0][current_rate - RATE_18M];
 936                         priv->tx_rate_fb1 =
 937                                 vnt_fb_opt1[FB_RATE1][current_rate - RATE_18M];
 938
 939                         fb_option = AUTO_FB_1;
 940                 }
 941         }
 942
 943         tx_context->fb_option = fb_option;
 944
 945         duration_id = vnt_generate_tx_parameter(tx_context, tx_buffer, &mic_hdr,
 946                                                 need_mic, need_rts);
 947
 948         tx_header_size = tx_context->tx_hdr_size;
 949         if (!tx_header_size) {
 950                 tx_context->in_use = false;
 951                 return -ENOMEM;
 952         }
 953
 954         tx_buffer_head->frag_ctl |= cpu_to_le16(FRAGCTL_NONFRAG);
 955
 956         tx_bytes = tx_header_size + tx_body_size;
 957
 958         memcpy(tx_context->hdr, skb->data, tx_body_size);
 959
 960         hdr->duration_id = cpu_to_le16(duration_id);
 961
 962         if (info->control.hw_key) {
 963                 tx_key = info->control.hw_key;
 964                 if (tx_key->keylen > 0)
 965                         vnt_fill_txkey(tx_context, tx_buffer_head->tx_key,
 966                                 tx_key, skb, tx_body_size, mic_hdr);
 967         }
 968
 969         priv->seq_counter = (le16_to_cpu(hdr->seq_ctrl) &
 970                                                 IEEE80211_SCTL_SEQ) >> 4;
 971
 972         tx_buffer->tx_byte_count = cpu_to_le16(tx_bytes);
 973         tx_buffer->pkt_no = tx_context->pkt_no;
 974         tx_buffer->type = 0x00;
 975
 976         tx_bytes += 4;
 977
 978         tx_context->type = CONTEXT_DATA_PACKET;
 979         tx_context->buf_len = tx_bytes;
 980
 981         spin_lock_irqsave(&priv->lock, flags);
 982
 983         if (vnt_tx_context(priv, tx_context) != STATUS_PENDING) {
 984                 spin_unlock_irqrestore(&priv->lock, flags);
 985                 return -EIO;
 986         }
 987
 988         spin_unlock_irqrestore(&priv->lock, flags);
 989
 990         return 0;
 991 }
 992
 993 static int vnt_beacon_xmit(struct vnt_private *priv,
 994         struct sk_buff *skb)
 995 {
 996         struct vnt_beacon_buffer *beacon_buffer;
 997         struct vnt_tx_short_buf_head *short_head;
 998         struct ieee80211_tx_info *info;
 999         struct vnt_usb_send_context *context;
1000         struct ieee80211_mgmt *mgmt_hdr;
1001         unsigned long flags;
1002         u32 frame_size = skb->len + 4;
1003         u16 current_rate, count;
1004
1005         spin_lock_irqsave(&priv->lock, flags);
1006
1007         context = vnt_get_free_context(priv);
1008         if (!context) {
1009                 dev_dbg(&priv->usb->dev, "%s No free context!\n", __func__);
1010                 spin_unlock_irqrestore(&priv->lock, flags);
1011                 return -ENOMEM;
1012         }
1013
1014         context->skb = skb;
1015
1016         spin_unlock_irqrestore(&priv->lock, flags);
1017
1018         beacon_buffer = (struct vnt_beacon_buffer *)&context->data[0];
1019         short_head = &beacon_buffer->short_head;
1020
1021         if (priv->bb_type == BB_TYPE_11A) {
1022                 current_rate = RATE_6M;
1023
1024                 /* Get SignalField,ServiceField,Length */
1025                 vnt_get_phy_field(priv, frame_size, current_rate,
1026                         PK_TYPE_11A, &short_head->ab);
1027
1028                 /* Get Duration and TimeStampOff */
1029                 short_head->duration = vnt_get_duration_le(priv,
1030                                                         PK_TYPE_11A, false);
1031                 short_head->time_stamp_off =
1032                                 vnt_time_stamp_off(priv, current_rate);
1033         } else {
1034                 current_rate = RATE_1M;
1035                 short_head->fifo_ctl |= cpu_to_le16(FIFOCTL_11B);
1036
1037                 /* Get SignalField,ServiceField,Length */
1038                 vnt_get_phy_field(priv, frame_size, current_rate,
1039                                         PK_TYPE_11B, &short_head->ab);
1040
1041                 /* Get Duration and TimeStampOff */
1042                 short_head->duration = vnt_get_duration_le(priv,
1043                                                 PK_TYPE_11B, false);
1044                 short_head->time_stamp_off =
1045                         vnt_time_stamp_off(priv, current_rate);
1046         }
1047
1048         /* Generate Beacon Header */
1049         mgmt_hdr = &beacon_buffer->mgmt_hdr;
1050         memcpy(mgmt_hdr, skb->data, skb->len);
1051
1052         /* time stamp always 0 */
1053         mgmt_hdr->u.beacon.timestamp = 0;
1054
1055         info = IEEE80211_SKB_CB(skb);
1056         if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) {
1057                 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)mgmt_hdr;
1058
1059                 hdr->duration_id = 0;
1060                 hdr->seq_ctrl = cpu_to_le16(priv->seq_counter << 4);
1061         }
1062
1063         priv->seq_counter++;
1064         if (priv->seq_counter > 0x0fff)
1065                 priv->seq_counter = 0;
1066
1067         count = sizeof(struct vnt_tx_short_buf_head) + skb->len;
1068
1069         beacon_buffer->tx_byte_count = cpu_to_le16(count);
1070         beacon_buffer->pkt_no = context->pkt_no;
1071         beacon_buffer->type = 0x01;
1072
1073         context->type = CONTEXT_BEACON_PACKET;
1074         context->buf_len = count + 4; /* USB header */
1075
1076         spin_lock_irqsave(&priv->lock, flags);
1077
1078         if (vnt_tx_context(priv, context) != STATUS_PENDING)
1079                 ieee80211_free_txskb(priv->hw, context->skb);
1080
1081         spin_unlock_irqrestore(&priv->lock, flags);
1082
1083         return 0;
1084 }
1085
1086 int vnt_beacon_make(struct vnt_private *priv, struct ieee80211_vif *vif)
1087 {
1088         struct sk_buff *beacon;
1089
1090         beacon = ieee80211_beacon_get(priv->hw, vif);
1091         if (!beacon)
1092                 return -ENOMEM;
1093
1094         if (vnt_beacon_xmit(priv, beacon)) {
1095                 ieee80211_free_txskb(priv->hw, beacon);
1096                 return -ENODEV;
1097         }
1098
1099         return 0;
1100 }
1101
1102 int vnt_beacon_enable(struct vnt_private *priv, struct ieee80211_vif *vif,
1103         struct ieee80211_bss_conf *conf)
1104 {
1105         vnt_mac_reg_bits_off(priv, MAC_REG_TCR, TCR_AUTOBCNTX);
1106
1107         vnt_mac_reg_bits_off(priv, MAC_REG_TFTCTL, TFTCTL_TSFCNTREN);
1108
1109         vnt_mac_set_beacon_interval(priv, conf->beacon_int);
1110
1111         vnt_clear_current_tsf(priv);
1112
1113         vnt_mac_reg_bits_on(priv, MAC_REG_TFTCTL, TFTCTL_TSFCNTREN);
1114
1115         vnt_reset_next_tbtt(priv, conf->beacon_int);
1116
1117         return vnt_beacon_make(priv, vif);
1118 }