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  *
  16  * File: rxtx.c
  17  *
  18  * Purpose: handle WMAC/802.3/802.11 rx & tx functions
  19  *
  20  * Author: Lyndon Chen
  21  *
  22  * Date: May 20, 2003
  23  *
  24  * Functions:
  25  *      vnt_generate_tx_parameter - Generate tx dma required parameter.
  26  *      vnt_get_duration_le - get tx data required duration
  27  *      vnt_get_rtscts_duration_le- get rtx/cts required duration
  28  *      vnt_get_rtscts_rsvtime_le- get rts/cts reserved time
  29  *      vnt_get_rsvtime- get frame reserved time
  30  *      vnt_fill_cts_head- fulfill CTS ctl header
  31  *
  32  * Revision History:
  33  *
  34  */
  35
  36 #include <linux/etherdevice.h>
  37 #include "device.h"
  38 #include "rxtx.h"
  39 #include "card.h"
  40 #include "mac.h"
  41 #include "rf.h"
  42 #include "usbpipe.h"
  43
  44 static const u16 vnt_time_stampoff[2][MAX_RATE] = {
  45         /* Long Preamble */
  46         {384, 288, 226, 209, 54, 43, 37, 31, 28, 25, 24, 23},
  47
  48         /* Short Preamble */
  49         {384, 192, 130, 113, 54, 43, 37, 31, 28, 25, 24, 23},
  50 };
  51
  52 static const u16 vnt_fb_opt0[2][5] = {
  53         {RATE_12M, RATE_18M, RATE_24M, RATE_36M, RATE_48M}, /* fallback_rate0 */
  54         {RATE_12M, RATE_12M, RATE_18M, RATE_24M, RATE_36M}, /* fallback_rate1 */
  55 };
  56
  57 static const u16 vnt_fb_opt1[2][5] = {
  58         {RATE_12M, RATE_18M, RATE_24M, RATE_24M, RATE_36M}, /* fallback_rate0 */
  59         {RATE_6M,  RATE_6M,  RATE_12M, RATE_12M, RATE_18M}, /* fallback_rate1 */
  60 };
  61
  62 #define RTSDUR_BB       0
  63 #define RTSDUR_BA       1
  64 #define RTSDUR_AA       2
  65 #define CTSDUR_BA       3
  66 #define RTSDUR_BA_F0    4
  67 #define RTSDUR_AA_F0    5
  68 #define RTSDUR_BA_F1    6
  69 #define RTSDUR_AA_F1    7
  70 #define CTSDUR_BA_F0    8
  71 #define CTSDUR_BA_F1    9
  72 #define DATADUR_B       10
  73 #define DATADUR_A       11
  74 #define DATADUR_A_F0    12
  75 #define DATADUR_A_F1    13
  76
  77 static struct vnt_usb_send_context
  78         *vnt_get_free_context(struct vnt_private *priv)
  79 {
  80         struct vnt_usb_send_context *context = NULL;
  81         int ii;
  82
  83         dev_dbg(&priv->usb->dev, "%s\n", __func__);
  84
  85         for (ii = 0; ii < priv->num_tx_context; ii++) {
  86                 if (!priv->tx_context[ii])
  87                         return NULL;
  88
  89                 context = priv->tx_context[ii];
  90                 if (!context->in_use) {
  91                         context->in_use = true;
  92                         memset(context->data, 0,
  93                                         MAX_TOTAL_SIZE_WITH_ALL_HEADERS);
  94
  95                         context->hdr = NULL;
  96
  97                         return context;
  98                 }
  99         }
 100
 101         if (ii == priv->num_tx_context) {
 102                 dev_dbg(&priv->usb->dev, "%s No Free Tx Context\n", __func__);
 103
 104                 ieee80211_stop_queues(priv->hw);
 105         }
 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_nullfunc(hdr->frame_control)) {
 281                 buf->duration_a = hdr->duration_id;
 282                 buf->duration_b = hdr->duration_id;
 283         } else {
 284                 buf->duration_a = vnt_get_duration_le(priv,
 285                                                 tx_context->pkt_type, need_ack);
 286                 buf->duration_b = vnt_get_duration_le(priv,
 287                                                         PK_TYPE_11B, need_ack);
 288         }
 289
 290         buf->time_stamp_off_a = vnt_time_stamp_off(priv, rate);
 291         buf->time_stamp_off_b = vnt_time_stamp_off(priv,
 292                                         priv->top_cck_basic_rate);
 293
 294         tx_context->tx_hdr_size = vnt_mac_hdr_pos(tx_context, &buf->hdr);
 295
 296         return le16_to_cpu(buf->duration_a);
 297 }
 298
 299 static u16 vnt_rxtx_datahead_g_fb(struct vnt_usb_send_context *tx_context,
 300                                   struct vnt_tx_datahead_g_fb *buf)
 301 {
 302         struct vnt_private *priv = tx_context->priv;
 303         u32 frame_len = tx_context->frame_len;
 304         u16 rate = tx_context->tx_rate;
 305         u8 need_ack = tx_context->need_ack;
 306
 307         /* Get SignalField,ServiceField,Length */
 308         vnt_get_phy_field(priv, frame_len, rate, tx_context->pkt_type, &buf->a);
 309
 310         vnt_get_phy_field(priv, frame_len, priv->top_cck_basic_rate,
 311                                                 PK_TYPE_11B, &buf->b);
 312
 313         /* Get Duration and TimeStamp */
 314         buf->duration_a = vnt_get_duration_le(priv, tx_context->pkt_type,
 315                                               need_ack);
 316         buf->duration_b = vnt_get_duration_le(priv, PK_TYPE_11B, need_ack);
 317
 318         buf->duration_a_f0 = vnt_get_duration_le(priv, tx_context->pkt_type,
 319                                                  need_ack);
 320         buf->duration_a_f1 = vnt_get_duration_le(priv, tx_context->pkt_type,
 321                                                  need_ack);
 322
 323         buf->time_stamp_off_a = vnt_time_stamp_off(priv, rate);
 324         buf->time_stamp_off_b = vnt_time_stamp_off(priv,
 325                                                 priv->top_cck_basic_rate);
 326
 327         tx_context->tx_hdr_size = vnt_mac_hdr_pos(tx_context, &buf->hdr);
 328
 329         return le16_to_cpu(buf->duration_a);
 330 }
 331
 332 static u16 vnt_rxtx_datahead_a_fb(struct vnt_usb_send_context *tx_context,
 333                                   struct vnt_tx_datahead_a_fb *buf)
 334 {
 335         struct vnt_private *priv = tx_context->priv;
 336         u16 rate = tx_context->tx_rate;
 337         u8 pkt_type = tx_context->pkt_type;
 338         u8 need_ack = tx_context->need_ack;
 339         u32 frame_len = tx_context->frame_len;
 340
 341         /* Get SignalField,ServiceField,Length */
 342         vnt_get_phy_field(priv, frame_len, rate, pkt_type, &buf->a);
 343         /* Get Duration and TimeStampOff */
 344         buf->duration = vnt_get_duration_le(priv, pkt_type, need_ack);
 345
 346         buf->duration_f0 = vnt_get_duration_le(priv, pkt_type, need_ack);
 347         buf->duration_f1 = vnt_get_duration_le(priv, pkt_type, need_ack);
 348
 349         buf->time_stamp_off = vnt_time_stamp_off(priv, rate);
 350
 351         tx_context->tx_hdr_size = vnt_mac_hdr_pos(tx_context, &buf->hdr);
 352
 353         return le16_to_cpu(buf->duration);
 354 }
 355
 356 static u16 vnt_rxtx_datahead_ab(struct vnt_usb_send_context *tx_context,
 357                                 struct vnt_tx_datahead_ab *buf)
 358 {
 359         struct vnt_private *priv = tx_context->priv;
 360         struct ieee80211_hdr *hdr =
 361                                 (struct ieee80211_hdr *)tx_context->skb->data;
 362         u32 frame_len = tx_context->frame_len;
 363         u16 rate = tx_context->tx_rate;
 364         u8 need_ack = tx_context->need_ack;
 365
 366         /* Get SignalField,ServiceField,Length */
 367         vnt_get_phy_field(priv, frame_len, rate,
 368                           tx_context->pkt_type, &buf->ab);
 369
 370         /* Get Duration and TimeStampOff */
 371         if (ieee80211_is_nullfunc(hdr->frame_control)) {
 372                 buf->duration = hdr->duration_id;
 373         } else {
 374                 buf->duration = vnt_get_duration_le(priv, tx_context->pkt_type,
 375                                                     need_ack);
 376         }
 377
 378         buf->time_stamp_off = vnt_time_stamp_off(priv, rate);
 379
 380         tx_context->tx_hdr_size = vnt_mac_hdr_pos(tx_context, &buf->hdr);
 381
 382         return le16_to_cpu(buf->duration);
 383 }
 384
 385 static int vnt_fill_ieee80211_rts(struct vnt_usb_send_context *tx_context,
 386         struct ieee80211_rts *rts, __le16 duration)
 387 {
 388         struct ieee80211_hdr *hdr =
 389                                 (struct ieee80211_hdr *)tx_context->skb->data;
 390
 391         rts->duration = duration;
 392         rts->frame_control =
 393                 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
 394
 395         ether_addr_copy(rts->ra, hdr->addr1);
 396         ether_addr_copy(rts->ta, hdr->addr2);
 397
 398         return 0;
 399 }
 400
 401 static u16 vnt_rxtx_rts_g_head(struct vnt_usb_send_context *tx_context,
 402                                struct vnt_rts_g *buf)
 403 {
 404         struct vnt_private *priv = tx_context->priv;
 405         u16 rts_frame_len = 20;
 406         u16 current_rate = tx_context->tx_rate;
 407
 408         vnt_get_phy_field(priv, rts_frame_len, priv->top_cck_basic_rate,
 409                 PK_TYPE_11B, &buf->b);
 410         vnt_get_phy_field(priv, rts_frame_len, priv->top_ofdm_basic_rate,
 411                           tx_context->pkt_type, &buf->a);
 412
 413         buf->duration_bb = vnt_get_rtscts_duration_le(tx_context, RTSDUR_BB,
 414                                                       PK_TYPE_11B,
 415                                                       priv->top_cck_basic_rate);
 416         buf->duration_aa = vnt_get_rtscts_duration_le(tx_context, RTSDUR_AA,
 417                                                       tx_context->pkt_type,
 418                                                       current_rate);
 419         buf->duration_ba = vnt_get_rtscts_duration_le(tx_context, RTSDUR_BA,
 420                                                       tx_context->pkt_type,
 421                                                       current_rate);
 422
 423         vnt_fill_ieee80211_rts(tx_context, &buf->data, buf->duration_aa);
 424
 425         return vnt_rxtx_datahead_g(tx_context, &buf->data_head);
 426 }
 427
 428 static u16 vnt_rxtx_rts_g_fb_head(struct vnt_usb_send_context *tx_context,
 429                                   struct vnt_rts_g_fb *buf)
 430 {
 431         struct vnt_private *priv = tx_context->priv;
 432         u16 current_rate = tx_context->tx_rate;
 433         u16 rts_frame_len = 20;
 434
 435         vnt_get_phy_field(priv, rts_frame_len, priv->top_cck_basic_rate,
 436                 PK_TYPE_11B, &buf->b);
 437         vnt_get_phy_field(priv, rts_frame_len, priv->top_ofdm_basic_rate,
 438                           tx_context->pkt_type, &buf->a);
 439
 440         buf->duration_bb = vnt_get_rtscts_duration_le(tx_context, RTSDUR_BB,
 441                                                       PK_TYPE_11B,
 442                                                       priv->top_cck_basic_rate);
 443         buf->duration_aa = vnt_get_rtscts_duration_le(tx_context, RTSDUR_AA,
 444                                                       tx_context->pkt_type,
 445                                                       current_rate);
 446         buf->duration_ba = vnt_get_rtscts_duration_le(tx_context, RTSDUR_BA,
 447                                                       tx_context->pkt_type,
 448                                                       current_rate);
 449
 450         buf->rts_duration_ba_f0 =
 451                 vnt_get_rtscts_duration_le(tx_context, RTSDUR_BA_F0,
 452                                            tx_context->pkt_type,
 453                                            priv->tx_rate_fb0);
 454         buf->rts_duration_aa_f0 =
 455                 vnt_get_rtscts_duration_le(tx_context, RTSDUR_AA_F0,
 456                                            tx_context->pkt_type,
 457                                            priv->tx_rate_fb0);
 458         buf->rts_duration_ba_f1 =
 459                 vnt_get_rtscts_duration_le(tx_context, RTSDUR_BA_F1,
 460                                            tx_context->pkt_type,
 461                                            priv->tx_rate_fb1);
 462         buf->rts_duration_aa_f1 =
 463                 vnt_get_rtscts_duration_le(tx_context, RTSDUR_AA_F1,
 464                                            tx_context->pkt_type,
 465                                            priv->tx_rate_fb1);
 466
 467         vnt_fill_ieee80211_rts(tx_context, &buf->data, buf->duration_aa);
 468
 469         return vnt_rxtx_datahead_g_fb(tx_context, &buf->data_head);
 470 }
 471
 472 static u16 vnt_rxtx_rts_ab_head(struct vnt_usb_send_context *tx_context,
 473                                 struct vnt_rts_ab *buf)
 474 {
 475         struct vnt_private *priv = tx_context->priv;
 476         u16 current_rate = tx_context->tx_rate;
 477         u16 rts_frame_len = 20;
 478
 479         vnt_get_phy_field(priv, rts_frame_len, priv->top_ofdm_basic_rate,
 480                           tx_context->pkt_type, &buf->ab);
 481
 482         buf->duration = vnt_get_rtscts_duration_le(tx_context, RTSDUR_AA,
 483                                                    tx_context->pkt_type,
 484                                                    current_rate);
 485
 486         vnt_fill_ieee80211_rts(tx_context, &buf->data, buf->duration);
 487
 488         return vnt_rxtx_datahead_ab(tx_context, &buf->data_head);
 489 }
 490
 491 static u16 vnt_rxtx_rts_a_fb_head(struct vnt_usb_send_context *tx_context,
 492                                   struct vnt_rts_a_fb *buf)
 493 {
 494         struct vnt_private *priv = tx_context->priv;
 495         u16 current_rate = tx_context->tx_rate;
 496         u16 rts_frame_len = 20;
 497
 498         vnt_get_phy_field(priv, rts_frame_len,
 499                 priv->top_ofdm_basic_rate, tx_context->pkt_type, &buf->a);
 500
 501         buf->duration = vnt_get_rtscts_duration_le(tx_context, RTSDUR_AA,
 502                                                    tx_context->pkt_type,
 503                                                    current_rate);
 504
 505         buf->rts_duration_f0 =
 506                 vnt_get_rtscts_duration_le(tx_context, RTSDUR_AA_F0,
 507                                            tx_context->pkt_type,
 508                                            priv->tx_rate_fb0);
 509
 510         buf->rts_duration_f1 =
 511                 vnt_get_rtscts_duration_le(tx_context, RTSDUR_AA_F1,
 512                                            tx_context->pkt_type,
 513                                            priv->tx_rate_fb1);
 514
 515         vnt_fill_ieee80211_rts(tx_context, &buf->data, buf->duration);
 516
 517         return vnt_rxtx_datahead_a_fb(tx_context, &buf->data_head);
 518 }
 519
 520 static u16 vnt_fill_cts_fb_head(struct vnt_usb_send_context *tx_context,
 521                                 union vnt_tx_data_head *head)
 522 {
 523         struct vnt_private *priv = tx_context->priv;
 524         struct vnt_cts_fb *buf = &head->cts_g_fb;
 525         u32 cts_frame_len = 14;
 526         u16 current_rate = tx_context->tx_rate;
 527
 528         /* Get SignalField,ServiceField,Length */
 529         vnt_get_phy_field(priv, cts_frame_len, priv->top_cck_basic_rate,
 530                           PK_TYPE_11B, &buf->b);
 531
 532         buf->duration_ba =
 533                 vnt_get_rtscts_duration_le(tx_context, CTSDUR_BA,
 534                                            tx_context->pkt_type,
 535                                            current_rate);
 536         /* Get CTSDuration_ba_f0 */
 537         buf->cts_duration_ba_f0 =
 538                 vnt_get_rtscts_duration_le(tx_context, CTSDUR_BA_F0,
 539                                            tx_context->pkt_type,
 540                                            priv->tx_rate_fb0);
 541         /* Get CTSDuration_ba_f1 */
 542         buf->cts_duration_ba_f1 =
 543                 vnt_get_rtscts_duration_le(tx_context, CTSDUR_BA_F1,
 544                                            tx_context->pkt_type,
 545                                            priv->tx_rate_fb1);
 546         /* Get CTS Frame body */
 547         buf->data.duration = buf->duration_ba;
 548         buf->data.frame_control =
 549                 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
 550
 551         ether_addr_copy(buf->data.ra, priv->current_net_addr);
 552
 553         return vnt_rxtx_datahead_g_fb(tx_context, &buf->data_head);
 554 }
 555
 556 static u16 vnt_fill_cts_head(struct vnt_usb_send_context *tx_context,
 557                              union vnt_tx_data_head *head)
 558 {
 559         struct vnt_private *priv = tx_context->priv;
 560         struct vnt_cts *buf = &head->cts_g;
 561         u32 cts_frame_len = 14;
 562         u16 current_rate = tx_context->tx_rate;
 563
 564         /* Get SignalField,ServiceField,Length */
 565         vnt_get_phy_field(priv, cts_frame_len, priv->top_cck_basic_rate,
 566                           PK_TYPE_11B, &buf->b);
 567         /* Get CTSDuration_ba */
 568         buf->duration_ba =
 569                 vnt_get_rtscts_duration_le(tx_context, CTSDUR_BA,
 570                                            tx_context->pkt_type,
 571                                            current_rate);
 572         /*Get CTS Frame body*/
 573         buf->data.duration = buf->duration_ba;
 574         buf->data.frame_control =
 575                 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
 576
 577         ether_addr_copy(buf->data.ra, priv->current_net_addr);
 578
 579         return vnt_rxtx_datahead_g(tx_context, &buf->data_head);
 580 }
 581
 582 static u16 vnt_rxtx_rts(struct vnt_usb_send_context *tx_context,
 583                         union vnt_tx_head *tx_head, bool need_mic)
 584 {
 585         struct vnt_private *priv = tx_context->priv;
 586         struct vnt_rrv_time_rts *buf = &tx_head->tx_rts.rts;
 587         union vnt_tx_data_head *head = &tx_head->tx_rts.tx.head;
 588         u32 frame_len = tx_context->frame_len;
 589         u16 current_rate = tx_context->tx_rate;
 590         u8 need_ack = tx_context->need_ack;
 591
 592         buf->rts_rrv_time_aa = vnt_get_rtscts_rsvtime_le(priv, 2,
 593                         tx_context->pkt_type, frame_len, current_rate);
 594         buf->rts_rrv_time_ba = vnt_get_rtscts_rsvtime_le(priv, 1,
 595                         tx_context->pkt_type, frame_len, current_rate);
 596         buf->rts_rrv_time_bb = vnt_get_rtscts_rsvtime_le(priv, 0,
 597                         tx_context->pkt_type, frame_len, current_rate);
 598
 599         buf->rrv_time_a = vnt_rxtx_rsvtime_le16(priv, tx_context->pkt_type,
 600                                                 frame_len, current_rate,
 601                                                 need_ack);
 602         buf->rrv_time_b = vnt_rxtx_rsvtime_le16(priv, PK_TYPE_11B, frame_len,
 603                                         priv->top_cck_basic_rate, need_ack);
 604
 605         if (need_mic)
 606                 head = &tx_head->tx_rts.tx.mic.head;
 607
 608         if (tx_context->fb_option)
 609                 return vnt_rxtx_rts_g_fb_head(tx_context, &head->rts_g_fb);
 610
 611         return vnt_rxtx_rts_g_head(tx_context, &head->rts_g);
 612 }
 613
 614 static u16 vnt_rxtx_cts(struct vnt_usb_send_context *tx_context,
 615                         union vnt_tx_head *tx_head, bool need_mic)
 616 {
 617         struct vnt_private *priv = tx_context->priv;
 618         struct vnt_rrv_time_cts *buf = &tx_head->tx_cts.cts;
 619         union vnt_tx_data_head *head = &tx_head->tx_cts.tx.head;
 620         u32 frame_len = tx_context->frame_len;
 621         u16 current_rate = tx_context->tx_rate;
 622         u8 need_ack = tx_context->need_ack;
 623
 624         buf->rrv_time_a = vnt_rxtx_rsvtime_le16(priv, tx_context->pkt_type,
 625                                         frame_len, current_rate, need_ack);
 626         buf->rrv_time_b = vnt_rxtx_rsvtime_le16(priv, PK_TYPE_11B,
 627                                 frame_len, priv->top_cck_basic_rate, need_ack);
 628
 629         buf->cts_rrv_time_ba = vnt_get_rtscts_rsvtime_le(priv, 3,
 630                         tx_context->pkt_type, frame_len, current_rate);
 631
 632         if (need_mic)
 633                 head = &tx_head->tx_cts.tx.mic.head;
 634
 635         /* Fill CTS */
 636         if (tx_context->fb_option)
 637                 return vnt_fill_cts_fb_head(tx_context, head);
 638
 639         return vnt_fill_cts_head(tx_context, head);
 640 }
 641
 642 static u16 vnt_rxtx_ab(struct vnt_usb_send_context *tx_context,
 643                        union vnt_tx_head *tx_head, bool need_rts, bool need_mic)
 644 {
 645         struct vnt_private *priv = tx_context->priv;
 646         struct vnt_rrv_time_ab *buf = &tx_head->tx_ab.ab;
 647         union vnt_tx_data_head *head = &tx_head->tx_ab.tx.head;
 648         u32 frame_len = tx_context->frame_len;
 649         u16 current_rate = tx_context->tx_rate;
 650         u8 need_ack = tx_context->need_ack;
 651
 652         buf->rrv_time = vnt_rxtx_rsvtime_le16(priv, tx_context->pkt_type,
 653                         frame_len, current_rate, need_ack);
 654
 655         if (need_mic)
 656                 head = &tx_head->tx_ab.tx.mic.head;
 657
 658         if (need_rts) {
 659                 if (tx_context->pkt_type == PK_TYPE_11B)
 660                         buf->rts_rrv_time = vnt_get_rtscts_rsvtime_le(priv, 0,
 661                                 tx_context->pkt_type, frame_len, current_rate);
 662                 else /* PK_TYPE_11A */
 663                         buf->rts_rrv_time = vnt_get_rtscts_rsvtime_le(priv, 2,
 664                                 tx_context->pkt_type, frame_len, current_rate);
 665
 666                 if (tx_context->fb_option &&
 667                     tx_context->pkt_type == PK_TYPE_11A)
 668                         return vnt_rxtx_rts_a_fb_head(tx_context,
 669                                                       &head->rts_a_fb);
 670
 671                 return vnt_rxtx_rts_ab_head(tx_context, &head->rts_ab);
 672         }
 673
 674         if (tx_context->pkt_type == PK_TYPE_11A)
 675                 return vnt_rxtx_datahead_a_fb(tx_context,
 676                                               &head->data_head_a_fb);
 677
 678         return vnt_rxtx_datahead_ab(tx_context, &head->data_head_ab);
 679 }
 680
 681 static u16 vnt_generate_tx_parameter(struct vnt_usb_send_context *tx_context,
 682         struct vnt_tx_buffer *tx_buffer,
 683         struct vnt_mic_hdr **mic_hdr, u32 need_mic,
 684         bool need_rts)
 685 {
 686
 687         if (tx_context->pkt_type == PK_TYPE_11GB ||
 688             tx_context->pkt_type == PK_TYPE_11GA) {
 689                 if (need_rts) {
 690                         if (need_mic)
 691                                 *mic_hdr = &tx_buffer->
 692                                                 tx_head.tx_rts.tx.mic.hdr;
 693
 694                         return vnt_rxtx_rts(tx_context, &tx_buffer->tx_head,
 695                                             need_mic);
 696                 }
 697
 698                 if (need_mic)
 699                         *mic_hdr = &tx_buffer->tx_head.tx_cts.tx.mic.hdr;
 700
 701                 return vnt_rxtx_cts(tx_context, &tx_buffer->tx_head, need_mic);
 702         }
 703
 704         if (need_mic)
 705                 *mic_hdr = &tx_buffer->tx_head.tx_ab.tx.mic.hdr;
 706
 707         return vnt_rxtx_ab(tx_context, &tx_buffer->tx_head, need_rts, need_mic);
 708 }
 709
 710 static void vnt_fill_txkey(struct vnt_usb_send_context *tx_context,
 711         u8 *key_buffer, struct ieee80211_key_conf *tx_key, struct sk_buff *skb,
 712         u16 payload_len, struct vnt_mic_hdr *mic_hdr)
 713 {
 714         struct ieee80211_hdr *hdr = tx_context->hdr;
 715         u64 pn64;
 716         u8 *iv = ((u8 *)hdr + ieee80211_get_hdrlen_from_skb(skb));
 717
 718         /* strip header and icv len from payload */
 719         payload_len -= ieee80211_get_hdrlen_from_skb(skb);
 720         payload_len -= tx_key->icv_len;
 721
 722         switch (tx_key->cipher) {
 723         case WLAN_CIPHER_SUITE_WEP40:
 724         case WLAN_CIPHER_SUITE_WEP104:
 725                 memcpy(key_buffer, iv, 3);
 726                 memcpy(key_buffer + 3, tx_key->key, tx_key->keylen);
 727
 728                 if (tx_key->keylen == WLAN_KEY_LEN_WEP40) {
 729                         memcpy(key_buffer + 8, iv, 3);
 730                         memcpy(key_buffer + 11,
 731                                         tx_key->key, WLAN_KEY_LEN_WEP40);
 732                 }
 733
 734                 break;
 735         case WLAN_CIPHER_SUITE_TKIP:
 736                 ieee80211_get_tkip_p2k(tx_key, skb, key_buffer);
 737
 738                 break;
 739         case WLAN_CIPHER_SUITE_CCMP:
 740
 741                 if (!mic_hdr)
 742                         return;
 743
 744                 mic_hdr->id = 0x59;
 745                 mic_hdr->payload_len = cpu_to_be16(payload_len);
 746                 ether_addr_copy(mic_hdr->mic_addr2, hdr->addr2);
 747
 748                 pn64 = atomic64_read(&tx_key->tx_pn);
 749                 mic_hdr->ccmp_pn[5] = pn64;
 750                 mic_hdr->ccmp_pn[4] = pn64 >> 8;
 751                 mic_hdr->ccmp_pn[3] = pn64 >> 16;
 752                 mic_hdr->ccmp_pn[2] = pn64 >> 24;
 753                 mic_hdr->ccmp_pn[1] = pn64 >> 32;
 754                 mic_hdr->ccmp_pn[0] = pn64 >> 40;
 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 == NL80211_BAND_5GHZ) {
 813                         pkt_type = PK_TYPE_11A;
 814                 } else {
 815                         if (tx_rate->flags & IEEE80211_TX_RC_USE_CTS_PROTECT) {
 816                                 if (priv->basic_rates & VNT_B_RATES)
 817                                         pkt_type = PK_TYPE_11GB;
 818                                 else
 819                                         pkt_type = PK_TYPE_11GA;
 820                         } else {
 821                                 pkt_type = PK_TYPE_11A;
 822                         }
 823                 }
 824         } else {
 825                 pkt_type = PK_TYPE_11B;
 826         }
 827
 828         spin_lock_irqsave(&priv->lock, flags);
 829
 830         tx_context = vnt_get_free_context(priv);
 831         if (!tx_context) {
 832                 dev_dbg(&priv->usb->dev, "%s No free context\n", __func__);
 833                 spin_unlock_irqrestore(&priv->lock, flags);
 834                 return -ENOMEM;
 835         }
 836
 837         tx_context->skb = skb;
 838         tx_context->pkt_type = pkt_type;
 839         tx_context->need_ack = false;
 840         tx_context->frame_len = skb->len + 4;
 841         tx_context->tx_rate = current_rate;
 842
 843         spin_unlock_irqrestore(&priv->lock, flags);
 844
 845         tx_buffer = (struct vnt_tx_buffer *)tx_context->data;
 846         tx_buffer_head = &tx_buffer->fifo_head;
 847         tx_body_size = skb->len;
 848
 849         /*Set fifo controls */
 850         if (pkt_type == PK_TYPE_11A)
 851                 tx_buffer_head->fifo_ctl = 0;
 852         else if (pkt_type == PK_TYPE_11B)
 853                 tx_buffer_head->fifo_ctl = cpu_to_le16(FIFOCTL_11B);
 854         else if (pkt_type == PK_TYPE_11GB)
 855                 tx_buffer_head->fifo_ctl = cpu_to_le16(FIFOCTL_11GB);
 856         else if (pkt_type == PK_TYPE_11GA)
 857                 tx_buffer_head->fifo_ctl = cpu_to_le16(FIFOCTL_11GA);
 858
 859         if (!ieee80211_is_data(hdr->frame_control)) {
 860                 tx_buffer_head->fifo_ctl |= cpu_to_le16(FIFOCTL_GENINT |
 861                                                         FIFOCTL_ISDMA0);
 862                 tx_buffer_head->fifo_ctl |= cpu_to_le16(FIFOCTL_TMOEN);
 863
 864                 tx_buffer_head->time_stamp =
 865                         cpu_to_le16(DEFAULT_MGN_LIFETIME_RES_64us);
 866         } else {
 867                 tx_buffer_head->time_stamp =
 868                         cpu_to_le16(DEFAULT_MSDU_LIFETIME_RES_64us);
 869         }
 870
 871         if (!(info->flags & IEEE80211_TX_CTL_NO_ACK)) {
 872                 tx_buffer_head->fifo_ctl |= cpu_to_le16(FIFOCTL_NEEDACK);
 873                 tx_context->need_ack = true;
 874         }
 875
 876         if (ieee80211_has_retry(hdr->frame_control))
 877                 tx_buffer_head->fifo_ctl |= cpu_to_le16(FIFOCTL_LRETRY);
 878
 879         if (tx_rate->flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)
 880                 priv->preamble_type = PREAMBLE_SHORT;
 881         else
 882                 priv->preamble_type = PREAMBLE_LONG;
 883
 884         if (tx_rate->flags & IEEE80211_TX_RC_USE_RTS_CTS) {
 885                 need_rts = true;
 886                 tx_buffer_head->fifo_ctl |= cpu_to_le16(FIFOCTL_RTS);
 887         }
 888
 889         if (ieee80211_has_a4(hdr->frame_control))
 890                 tx_buffer_head->fifo_ctl |= cpu_to_le16(FIFOCTL_LHEAD);
 891
 892         if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER)
 893                 is_pspoll = true;
 894
 895         tx_buffer_head->frag_ctl =
 896                         cpu_to_le16(ieee80211_get_hdrlen_from_skb(skb) << 10);
 897
 898         if (info->control.hw_key) {
 899                 tx_key = info->control.hw_key;
 900                 switch (info->control.hw_key->cipher) {
 901                 case WLAN_CIPHER_SUITE_WEP40:
 902                 case WLAN_CIPHER_SUITE_WEP104:
 903                         tx_buffer_head->frag_ctl |= cpu_to_le16(FRAGCTL_LEGACY);
 904                         break;
 905                 case WLAN_CIPHER_SUITE_TKIP:
 906                         tx_buffer_head->frag_ctl |= cpu_to_le16(FRAGCTL_TKIP);
 907                         break;
 908                 case WLAN_CIPHER_SUITE_CCMP:
 909                         tx_buffer_head->frag_ctl |= cpu_to_le16(FRAGCTL_AES);
 910                         need_mic = true;
 911                 default:
 912                         break;
 913                 }
 914                 tx_context->frame_len += tx_key->icv_len;
 915         }
 916
 917         tx_buffer_head->current_rate = cpu_to_le16(current_rate);
 918
 919         /* legacy rates TODO use ieee80211_tx_rate */
 920         if (current_rate >= RATE_18M && ieee80211_is_data(hdr->frame_control)) {
 921                 if (priv->auto_fb_ctrl == AUTO_FB_0) {
 922                         tx_buffer_head->fifo_ctl |=
 923                                                 cpu_to_le16(FIFOCTL_AUTO_FB_0);
 924
 925                         priv->tx_rate_fb0 =
 926                                 vnt_fb_opt0[FB_RATE0][current_rate - RATE_18M];
 927                         priv->tx_rate_fb1 =
 928                                 vnt_fb_opt0[FB_RATE1][current_rate - RATE_18M];
 929
 930                         fb_option = AUTO_FB_0;
 931                 } else if (priv->auto_fb_ctrl == AUTO_FB_1) {
 932                         tx_buffer_head->fifo_ctl |=
 933                                                 cpu_to_le16(FIFOCTL_AUTO_FB_1);
 934
 935                         priv->tx_rate_fb0 =
 936                                 vnt_fb_opt1[FB_RATE0][current_rate - RATE_18M];
 937                         priv->tx_rate_fb1 =
 938                                 vnt_fb_opt1[FB_RATE1][current_rate - RATE_18M];
 939
 940                         fb_option = AUTO_FB_1;
 941                 }
 942         }
 943
 944         tx_context->fb_option = fb_option;
 945
 946         duration_id = vnt_generate_tx_parameter(tx_context, tx_buffer, &mic_hdr,
 947                                                 need_mic, need_rts);
 948
 949         tx_header_size = tx_context->tx_hdr_size;
 950         if (!tx_header_size) {
 951                 tx_context->in_use = false;
 952                 return -ENOMEM;
 953         }
 954
 955         tx_buffer_head->frag_ctl |= cpu_to_le16(FRAGCTL_NONFRAG);
 956
 957         tx_bytes = tx_header_size + tx_body_size;
 958
 959         memcpy(tx_context->hdr, skb->data, tx_body_size);
 960
 961         hdr->duration_id = cpu_to_le16(duration_id);
 962
 963         if (info->control.hw_key) {
 964                 tx_key = info->control.hw_key;
 965                 if (tx_key->keylen > 0)
 966                         vnt_fill_txkey(tx_context, tx_buffer_head->tx_key,
 967                                 tx_key, skb, tx_body_size, mic_hdr);
 968         }
 969
 970         priv->seq_counter = (le16_to_cpu(hdr->seq_ctrl) &
 971                                                 IEEE80211_SCTL_SEQ) >> 4;
 972
 973         tx_buffer->tx_byte_count = cpu_to_le16(tx_bytes);
 974         tx_buffer->pkt_no = tx_context->pkt_no;
 975         tx_buffer->type = 0x00;
 976
 977         tx_bytes += 4;
 978
 979         tx_context->type = CONTEXT_DATA_PACKET;
 980         tx_context->buf_len = tx_bytes;
 981
 982         spin_lock_irqsave(&priv->lock, flags);
 983
 984         if (vnt_tx_context(priv, tx_context) != STATUS_PENDING) {
 985                 spin_unlock_irqrestore(&priv->lock, flags);
 986                 return -EIO;
 987         }
 988
 989         spin_unlock_irqrestore(&priv->lock, flags);
 990
 991         return 0;
 992 }
 993
 994 static int vnt_beacon_xmit(struct vnt_private *priv,
 995         struct sk_buff *skb)
 996 {
 997         struct vnt_beacon_buffer *beacon_buffer;
 998         struct vnt_tx_short_buf_head *short_head;
 999         struct ieee80211_tx_info *info;
1000         struct vnt_usb_send_context *context;
1001         struct ieee80211_mgmt *mgmt_hdr;
1002         unsigned long flags;
1003         u32 frame_size = skb->len + 4;
1004         u16 current_rate, count;
1005
1006         spin_lock_irqsave(&priv->lock, flags);
1007
1008         context = vnt_get_free_context(priv);
1009         if (!context) {
1010                 dev_dbg(&priv->usb->dev, "%s No free context!\n", __func__);
1011                 spin_unlock_irqrestore(&priv->lock, flags);
1012                 return -ENOMEM;
1013         }
1014
1015         context->skb = skb;
1016
1017         spin_unlock_irqrestore(&priv->lock, flags);
1018
1019         beacon_buffer = (struct vnt_beacon_buffer *)&context->data[0];
1020         short_head = &beacon_buffer->short_head;
1021
1022         if (priv->bb_type == BB_TYPE_11A) {
1023                 current_rate = RATE_6M;
1024
1025                 /* Get SignalField,ServiceField,Length */
1026                 vnt_get_phy_field(priv, frame_size, current_rate,
1027                         PK_TYPE_11A, &short_head->ab);
1028
1029                 /* Get Duration and TimeStampOff */
1030                 short_head->duration = vnt_get_duration_le(priv,
1031                                                         PK_TYPE_11A, false);
1032                 short_head->time_stamp_off =
1033                                 vnt_time_stamp_off(priv, current_rate);
1034         } else {
1035                 current_rate = RATE_1M;
1036                 short_head->fifo_ctl |= cpu_to_le16(FIFOCTL_11B);
1037
1038                 /* Get SignalField,ServiceField,Length */
1039                 vnt_get_phy_field(priv, frame_size, current_rate,
1040                                         PK_TYPE_11B, &short_head->ab);
1041
1042                 /* Get Duration and TimeStampOff */
1043                 short_head->duration = vnt_get_duration_le(priv,
1044                                                 PK_TYPE_11B, false);
1045                 short_head->time_stamp_off =
1046                         vnt_time_stamp_off(priv, current_rate);
1047         }
1048
1049         /* Generate Beacon Header */
1050         mgmt_hdr = &beacon_buffer->mgmt_hdr;
1051         memcpy(mgmt_hdr, skb->data, skb->len);
1052
1053         /* time stamp always 0 */
1054         mgmt_hdr->u.beacon.timestamp = 0;
1055
1056         info = IEEE80211_SKB_CB(skb);
1057         if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) {
1058                 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)mgmt_hdr;
1059
1060                 hdr->duration_id = 0;
1061                 hdr->seq_ctrl = cpu_to_le16(priv->seq_counter << 4);
1062         }
1063
1064         priv->seq_counter++;
1065         if (priv->seq_counter > 0x0fff)
1066                 priv->seq_counter = 0;
1067
1068         count = sizeof(struct vnt_tx_short_buf_head) + skb->len;
1069
1070         beacon_buffer->tx_byte_count = cpu_to_le16(count);
1071         beacon_buffer->pkt_no = context->pkt_no;
1072         beacon_buffer->type = 0x01;
1073
1074         context->type = CONTEXT_BEACON_PACKET;
1075         context->buf_len = count + 4; /* USB header */
1076
1077         spin_lock_irqsave(&priv->lock, flags);
1078
1079         if (vnt_tx_context(priv, context) != STATUS_PENDING)
1080                 ieee80211_free_txskb(priv->hw, context->skb);
1081
1082         spin_unlock_irqrestore(&priv->lock, flags);
1083
1084         return 0;
1085 }
1086
1087 int vnt_beacon_make(struct vnt_private *priv, struct ieee80211_vif *vif)
1088 {
1089         struct sk_buff *beacon;
1090
1091         beacon = ieee80211_beacon_get(priv->hw, vif);
1092         if (!beacon)
1093                 return -ENOMEM;
1094
1095         if (vnt_beacon_xmit(priv, beacon)) {
1096                 ieee80211_free_txskb(priv->hw, beacon);
1097                 return -ENODEV;
1098         }
1099
1100         return 0;
1101 }
1102
1103 int vnt_beacon_enable(struct vnt_private *priv, struct ieee80211_vif *vif,
1104         struct ieee80211_bss_conf *conf)
1105 {
1106         vnt_mac_reg_bits_off(priv, MAC_REG_TCR, TCR_AUTOBCNTX);
1107
1108         vnt_mac_reg_bits_off(priv, MAC_REG_TFTCTL, TFTCTL_TSFCNTREN);
1109
1110         vnt_mac_set_beacon_interval(priv, conf->beacon_int);
1111
1112         vnt_clear_current_tsf(priv);
1113
1114         vnt_mac_reg_bits_on(priv, MAC_REG_TFTCTL, TFTCTL_TSFCNTREN);
1115
1116         vnt_reset_next_tbtt(priv, conf->beacon_int);
1117
1118         return vnt_beacon_make(priv, vif);
1119 }