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, u8 rsv_type,
 145                                         u8 pkt_type, u32 frame_length,
 146                                         u16 current_rate)
 147 {
 148         u32 rrv_time, rts_time, cts_time, ack_time, data_time;
 149
 150         rrv_time = 0;
 151         rts_time = 0;
 152         cts_time = 0;
 153         ack_time = 0;
 154
 155         data_time = vnt_get_frame_time(priv->preamble_type, pkt_type,
 156                                        frame_length, current_rate);
 157
 158         if (rsv_type == 0) {
 159                 rts_time = vnt_get_frame_time(priv->preamble_type, pkt_type,
 160                                               20, priv->top_cck_basic_rate);
 161                 ack_time = vnt_get_frame_time(priv->preamble_type,
 162                                               pkt_type, 14,
 163                                               priv->top_cck_basic_rate);
 164                 cts_time = ack_time;
 165
 166         } else if (rsv_type == 1) {
 167                 rts_time = vnt_get_frame_time(priv->preamble_type, pkt_type,
 168                                               20, priv->top_cck_basic_rate);
 169                 cts_time = vnt_get_frame_time(priv->preamble_type, pkt_type,
 170                                               14, priv->top_cck_basic_rate);
 171                 ack_time = vnt_get_frame_time(priv->preamble_type, pkt_type,
 172                                               14, priv->top_ofdm_basic_rate);
 173         } else if (rsv_type == 2) {
 174                 rts_time = vnt_get_frame_time(priv->preamble_type, pkt_type,
 175                                               20, priv->top_ofdm_basic_rate);
 176                 ack_time = vnt_get_frame_time(priv->preamble_type,
 177                                               pkt_type, 14,
 178                                               priv->top_ofdm_basic_rate);
 179                 cts_time = ack_time;
 180
 181         } else if (rsv_type == 3) {
 182                 cts_time = vnt_get_frame_time(priv->preamble_type, pkt_type,
 183                                               14, priv->top_cck_basic_rate);
 184                 ack_time = vnt_get_frame_time(priv->preamble_type, pkt_type,
 185                                               14, priv->top_ofdm_basic_rate);
 186
 187                 rrv_time = cts_time + ack_time + data_time + 2 * priv->sifs;
 188
 189                 return cpu_to_le16((u16)rrv_time);
 190         }
 191
 192         rrv_time = rts_time + cts_time + ack_time + data_time + 3 * priv->sifs;
 193
 194         return cpu_to_le16((u16)rrv_time);
 195 }
 196
 197 static __le16 vnt_get_duration_le(struct vnt_private *priv, u8 pkt_type,
 198                                   int need_ack)
 199 {
 200         u32 ack_time = 0;
 201
 202         if (need_ack) {
 203                 if (pkt_type == PK_TYPE_11B)
 204                         ack_time = vnt_get_frame_time(priv->preamble_type,
 205                                                       pkt_type, 14,
 206                                                       priv->top_cck_basic_rate);
 207                 else
 208                         ack_time = vnt_get_frame_time(priv->preamble_type,
 209                                                       pkt_type, 14,
 210                                                       priv->top_ofdm_basic_rate);
 211
 212                 return cpu_to_le16((u16)(priv->sifs + ack_time));
 213         }
 214
 215         return 0;
 216 }
 217
 218 static __le16 vnt_get_rtscts_duration_le(struct vnt_usb_send_context *context,
 219                                          u8 dur_type, u8 pkt_type, u16 rate)
 220 {
 221         struct vnt_private *priv = context->priv;
 222         u32 cts_time = 0, dur_time = 0;
 223         u32 frame_length = context->frame_len;
 224         u8 need_ack = context->need_ack;
 225
 226         switch (dur_type) {
 227         case RTSDUR_BB:
 228         case RTSDUR_BA:
 229         case RTSDUR_BA_F0:
 230         case RTSDUR_BA_F1:
 231                 cts_time = vnt_get_frame_time(priv->preamble_type, pkt_type,
 232                                               14, priv->top_cck_basic_rate);
 233                 dur_time = cts_time + 2 * priv->sifs +
 234                         vnt_get_rsvtime(priv, pkt_type,
 235                                         frame_length, rate, need_ack);
 236                 break;
 237
 238         case RTSDUR_AA:
 239         case RTSDUR_AA_F0:
 240         case RTSDUR_AA_F1:
 241                 cts_time = vnt_get_frame_time(priv->preamble_type, pkt_type,
 242                                               14, priv->top_ofdm_basic_rate);
 243                 dur_time = cts_time + 2 * priv->sifs +
 244                         vnt_get_rsvtime(priv, pkt_type,
 245                                         frame_length, rate, need_ack);
 246                 break;
 247
 248         case CTSDUR_BA:
 249         case CTSDUR_BA_F0:
 250         case CTSDUR_BA_F1:
 251                 dur_time = priv->sifs + vnt_get_rsvtime(priv,
 252                                 pkt_type, frame_length, rate, need_ack);
 253                 break;
 254
 255         default:
 256                 break;
 257         }
 258
 259         return cpu_to_le16((u16)dur_time);
 260 }
 261
 262 static u16 vnt_mac_hdr_pos(struct vnt_usb_send_context *tx_context,
 263                            struct ieee80211_hdr *hdr)
 264 {
 265         u8 *head = tx_context->data + offsetof(struct vnt_tx_buffer, fifo_head);
 266         u8 *hdr_pos = (u8 *)hdr;
 267
 268         tx_context->hdr = hdr;
 269         if (!tx_context->hdr)
 270                 return 0;
 271
 272         return (u16)(hdr_pos - head);
 273 }
 274
 275 static u16 vnt_rxtx_datahead_g(struct vnt_usb_send_context *tx_context,
 276                                struct vnt_tx_datahead_g *buf)
 277 {
 278         struct vnt_private *priv = tx_context->priv;
 279         struct ieee80211_hdr *hdr =
 280                                 (struct ieee80211_hdr *)tx_context->skb->data;
 281         u32 frame_len = tx_context->frame_len;
 282         u16 rate = tx_context->tx_rate;
 283         u8 need_ack = tx_context->need_ack;
 284
 285         /* Get SignalField,ServiceField,Length */
 286         vnt_get_phy_field(priv, frame_len, rate, tx_context->pkt_type, &buf->a);
 287         vnt_get_phy_field(priv, frame_len, priv->top_cck_basic_rate,
 288                           PK_TYPE_11B, &buf->b);
 289
 290         /* Get Duration and TimeStamp */
 291         if (ieee80211_is_nullfunc(hdr->frame_control)) {
 292                 buf->duration_a = hdr->duration_id;
 293                 buf->duration_b = hdr->duration_id;
 294         } else {
 295                 buf->duration_a = vnt_get_duration_le(priv,
 296                                                 tx_context->pkt_type, need_ack);
 297                 buf->duration_b = vnt_get_duration_le(priv,
 298                                                         PK_TYPE_11B, need_ack);
 299         }
 300
 301         buf->time_stamp_off_a = vnt_time_stamp_off(priv, rate);
 302         buf->time_stamp_off_b = vnt_time_stamp_off(priv,
 303                                         priv->top_cck_basic_rate);
 304
 305         tx_context->tx_hdr_size = vnt_mac_hdr_pos(tx_context, &buf->hdr);
 306
 307         return le16_to_cpu(buf->duration_a);
 308 }
 309
 310 static u16 vnt_rxtx_datahead_g_fb(struct vnt_usb_send_context *tx_context,
 311                                   struct vnt_tx_datahead_g_fb *buf)
 312 {
 313         struct vnt_private *priv = tx_context->priv;
 314         u32 frame_len = tx_context->frame_len;
 315         u16 rate = tx_context->tx_rate;
 316         u8 need_ack = tx_context->need_ack;
 317
 318         /* Get SignalField,ServiceField,Length */
 319         vnt_get_phy_field(priv, frame_len, rate, tx_context->pkt_type, &buf->a);
 320
 321         vnt_get_phy_field(priv, frame_len, priv->top_cck_basic_rate,
 322                           PK_TYPE_11B, &buf->b);
 323
 324         /* Get Duration and TimeStamp */
 325         buf->duration_a = vnt_get_duration_le(priv, tx_context->pkt_type,
 326                                               need_ack);
 327         buf->duration_b = vnt_get_duration_le(priv, PK_TYPE_11B, need_ack);
 328
 329         buf->duration_a_f0 = vnt_get_duration_le(priv, tx_context->pkt_type,
 330                                                  need_ack);
 331         buf->duration_a_f1 = vnt_get_duration_le(priv, tx_context->pkt_type,
 332                                                  need_ack);
 333
 334         buf->time_stamp_off_a = vnt_time_stamp_off(priv, rate);
 335         buf->time_stamp_off_b = vnt_time_stamp_off(priv,
 336                                                 priv->top_cck_basic_rate);
 337
 338         tx_context->tx_hdr_size = vnt_mac_hdr_pos(tx_context, &buf->hdr);
 339
 340         return le16_to_cpu(buf->duration_a);
 341 }
 342
 343 static u16 vnt_rxtx_datahead_a_fb(struct vnt_usb_send_context *tx_context,
 344                                   struct vnt_tx_datahead_a_fb *buf)
 345 {
 346         struct vnt_private *priv = tx_context->priv;
 347         u16 rate = tx_context->tx_rate;
 348         u8 pkt_type = tx_context->pkt_type;
 349         u8 need_ack = tx_context->need_ack;
 350         u32 frame_len = tx_context->frame_len;
 351
 352         /* Get SignalField,ServiceField,Length */
 353         vnt_get_phy_field(priv, frame_len, rate, pkt_type, &buf->a);
 354         /* Get Duration and TimeStampOff */
 355         buf->duration = vnt_get_duration_le(priv, pkt_type, need_ack);
 356
 357         buf->duration_f0 = vnt_get_duration_le(priv, pkt_type, need_ack);
 358         buf->duration_f1 = vnt_get_duration_le(priv, pkt_type, need_ack);
 359
 360         buf->time_stamp_off = vnt_time_stamp_off(priv, rate);
 361
 362         tx_context->tx_hdr_size = vnt_mac_hdr_pos(tx_context, &buf->hdr);
 363
 364         return le16_to_cpu(buf->duration);
 365 }
 366
 367 static u16 vnt_rxtx_datahead_ab(struct vnt_usb_send_context *tx_context,
 368                                 struct vnt_tx_datahead_ab *buf)
 369 {
 370         struct vnt_private *priv = tx_context->priv;
 371         struct ieee80211_hdr *hdr =
 372                                 (struct ieee80211_hdr *)tx_context->skb->data;
 373         u32 frame_len = tx_context->frame_len;
 374         u16 rate = tx_context->tx_rate;
 375         u8 need_ack = tx_context->need_ack;
 376
 377         /* Get SignalField,ServiceField,Length */
 378         vnt_get_phy_field(priv, frame_len, rate,
 379                           tx_context->pkt_type, &buf->ab);
 380
 381         /* Get Duration and TimeStampOff */
 382         if (ieee80211_is_nullfunc(hdr->frame_control)) {
 383                 buf->duration = hdr->duration_id;
 384         } else {
 385                 buf->duration = vnt_get_duration_le(priv, tx_context->pkt_type,
 386                                                     need_ack);
 387         }
 388
 389         buf->time_stamp_off = vnt_time_stamp_off(priv, rate);
 390
 391         tx_context->tx_hdr_size = vnt_mac_hdr_pos(tx_context, &buf->hdr);
 392
 393         return le16_to_cpu(buf->duration);
 394 }
 395
 396 static int vnt_fill_ieee80211_rts(struct vnt_usb_send_context *tx_context,
 397                                   struct ieee80211_rts *rts, __le16 duration)
 398 {
 399         struct ieee80211_hdr *hdr =
 400                                 (struct ieee80211_hdr *)tx_context->skb->data;
 401
 402         rts->duration = duration;
 403         rts->frame_control =
 404                 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
 405
 406         ether_addr_copy(rts->ra, hdr->addr1);
 407         ether_addr_copy(rts->ta, hdr->addr2);
 408
 409         return 0;
 410 }
 411
 412 static u16 vnt_rxtx_rts_g_head(struct vnt_usb_send_context *tx_context,
 413                                struct vnt_rts_g *buf)
 414 {
 415         struct vnt_private *priv = tx_context->priv;
 416         u16 rts_frame_len = 20;
 417         u16 current_rate = tx_context->tx_rate;
 418
 419         vnt_get_phy_field(priv, rts_frame_len, priv->top_cck_basic_rate,
 420                           PK_TYPE_11B, &buf->b);
 421         vnt_get_phy_field(priv, rts_frame_len, priv->top_ofdm_basic_rate,
 422                           tx_context->pkt_type, &buf->a);
 423
 424         buf->duration_bb = vnt_get_rtscts_duration_le(tx_context, RTSDUR_BB,
 425                                                       PK_TYPE_11B,
 426                                                       priv->top_cck_basic_rate);
 427         buf->duration_aa = vnt_get_rtscts_duration_le(tx_context, RTSDUR_AA,
 428                                                       tx_context->pkt_type,
 429                                                       current_rate);
 430         buf->duration_ba = vnt_get_rtscts_duration_le(tx_context, RTSDUR_BA,
 431                                                       tx_context->pkt_type,
 432                                                       current_rate);
 433
 434         vnt_fill_ieee80211_rts(tx_context, &buf->data, buf->duration_aa);
 435
 436         return vnt_rxtx_datahead_g(tx_context, &buf->data_head);
 437 }
 438
 439 static u16 vnt_rxtx_rts_g_fb_head(struct vnt_usb_send_context *tx_context,
 440                                   struct vnt_rts_g_fb *buf)
 441 {
 442         struct vnt_private *priv = tx_context->priv;
 443         u16 current_rate = tx_context->tx_rate;
 444         u16 rts_frame_len = 20;
 445
 446         vnt_get_phy_field(priv, rts_frame_len, priv->top_cck_basic_rate,
 447                           PK_TYPE_11B, &buf->b);
 448         vnt_get_phy_field(priv, rts_frame_len, priv->top_ofdm_basic_rate,
 449                           tx_context->pkt_type, &buf->a);
 450
 451         buf->duration_bb = vnt_get_rtscts_duration_le(tx_context, RTSDUR_BB,
 452                                                       PK_TYPE_11B,
 453                                                       priv->top_cck_basic_rate);
 454         buf->duration_aa = vnt_get_rtscts_duration_le(tx_context, RTSDUR_AA,
 455                                                       tx_context->pkt_type,
 456                                                       current_rate);
 457         buf->duration_ba = vnt_get_rtscts_duration_le(tx_context, RTSDUR_BA,
 458                                                       tx_context->pkt_type,
 459                                                       current_rate);
 460
 461         buf->rts_duration_ba_f0 =
 462                 vnt_get_rtscts_duration_le(tx_context, RTSDUR_BA_F0,
 463                                            tx_context->pkt_type,
 464                                            priv->tx_rate_fb0);
 465         buf->rts_duration_aa_f0 =
 466                 vnt_get_rtscts_duration_le(tx_context, RTSDUR_AA_F0,
 467                                            tx_context->pkt_type,
 468                                            priv->tx_rate_fb0);
 469         buf->rts_duration_ba_f1 =
 470                 vnt_get_rtscts_duration_le(tx_context, RTSDUR_BA_F1,
 471                                            tx_context->pkt_type,
 472                                            priv->tx_rate_fb1);
 473         buf->rts_duration_aa_f1 =
 474                 vnt_get_rtscts_duration_le(tx_context, RTSDUR_AA_F1,
 475                                            tx_context->pkt_type,
 476                                            priv->tx_rate_fb1);
 477
 478         vnt_fill_ieee80211_rts(tx_context, &buf->data, buf->duration_aa);
 479
 480         return vnt_rxtx_datahead_g_fb(tx_context, &buf->data_head);
 481 }
 482
 483 static u16 vnt_rxtx_rts_ab_head(struct vnt_usb_send_context *tx_context,
 484                                 struct vnt_rts_ab *buf)
 485 {
 486         struct vnt_private *priv = tx_context->priv;
 487         u16 current_rate = tx_context->tx_rate;
 488         u16 rts_frame_len = 20;
 489
 490         vnt_get_phy_field(priv, rts_frame_len, priv->top_ofdm_basic_rate,
 491                           tx_context->pkt_type, &buf->ab);
 492
 493         buf->duration = vnt_get_rtscts_duration_le(tx_context, RTSDUR_AA,
 494                                                    tx_context->pkt_type,
 495                                                    current_rate);
 496
 497         vnt_fill_ieee80211_rts(tx_context, &buf->data, buf->duration);
 498
 499         return vnt_rxtx_datahead_ab(tx_context, &buf->data_head);
 500 }
 501
 502 static u16 vnt_rxtx_rts_a_fb_head(struct vnt_usb_send_context *tx_context,
 503                                   struct vnt_rts_a_fb *buf)
 504 {
 505         struct vnt_private *priv = tx_context->priv;
 506         u16 current_rate = tx_context->tx_rate;
 507         u16 rts_frame_len = 20;
 508
 509         vnt_get_phy_field(priv, rts_frame_len, priv->top_ofdm_basic_rate,
 510                           tx_context->pkt_type, &buf->a);
 511
 512         buf->duration = vnt_get_rtscts_duration_le(tx_context, RTSDUR_AA,
 513                                                    tx_context->pkt_type,
 514                                                    current_rate);
 515
 516         buf->rts_duration_f0 =
 517                 vnt_get_rtscts_duration_le(tx_context, RTSDUR_AA_F0,
 518                                            tx_context->pkt_type,
 519                                            priv->tx_rate_fb0);
 520
 521         buf->rts_duration_f1 =
 522                 vnt_get_rtscts_duration_le(tx_context, RTSDUR_AA_F1,
 523                                            tx_context->pkt_type,
 524                                            priv->tx_rate_fb1);
 525
 526         vnt_fill_ieee80211_rts(tx_context, &buf->data, buf->duration);
 527
 528         return vnt_rxtx_datahead_a_fb(tx_context, &buf->data_head);
 529 }
 530
 531 static u16 vnt_fill_cts_fb_head(struct vnt_usb_send_context *tx_context,
 532                                 union vnt_tx_data_head *head)
 533 {
 534         struct vnt_private *priv = tx_context->priv;
 535         struct vnt_cts_fb *buf = &head->cts_g_fb;
 536         u32 cts_frame_len = 14;
 537         u16 current_rate = tx_context->tx_rate;
 538
 539         /* Get SignalField,ServiceField,Length */
 540         vnt_get_phy_field(priv, cts_frame_len, priv->top_cck_basic_rate,
 541                           PK_TYPE_11B, &buf->b);
 542
 543         buf->duration_ba =
 544                 vnt_get_rtscts_duration_le(tx_context, CTSDUR_BA,
 545                                            tx_context->pkt_type,
 546                                            current_rate);
 547         /* Get CTSDuration_ba_f0 */
 548         buf->cts_duration_ba_f0 =
 549                 vnt_get_rtscts_duration_le(tx_context, CTSDUR_BA_F0,
 550                                            tx_context->pkt_type,
 551                                            priv->tx_rate_fb0);
 552         /* Get CTSDuration_ba_f1 */
 553         buf->cts_duration_ba_f1 =
 554                 vnt_get_rtscts_duration_le(tx_context, CTSDUR_BA_F1,
 555                                            tx_context->pkt_type,
 556                                            priv->tx_rate_fb1);
 557         /* Get CTS Frame body */
 558         buf->data.duration = buf->duration_ba;
 559         buf->data.frame_control =
 560                 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
 561
 562         ether_addr_copy(buf->data.ra, priv->current_net_addr);
 563
 564         return vnt_rxtx_datahead_g_fb(tx_context, &buf->data_head);
 565 }
 566
 567 static u16 vnt_fill_cts_head(struct vnt_usb_send_context *tx_context,
 568                              union vnt_tx_data_head *head)
 569 {
 570         struct vnt_private *priv = tx_context->priv;
 571         struct vnt_cts *buf = &head->cts_g;
 572         u32 cts_frame_len = 14;
 573         u16 current_rate = tx_context->tx_rate;
 574
 575         /* Get SignalField,ServiceField,Length */
 576         vnt_get_phy_field(priv, cts_frame_len, priv->top_cck_basic_rate,
 577                           PK_TYPE_11B, &buf->b);
 578         /* Get CTSDuration_ba */
 579         buf->duration_ba =
 580                 vnt_get_rtscts_duration_le(tx_context, CTSDUR_BA,
 581                                            tx_context->pkt_type,
 582                                            current_rate);
 583         /*Get CTS Frame body*/
 584         buf->data.duration = buf->duration_ba;
 585         buf->data.frame_control =
 586                 cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
 587
 588         ether_addr_copy(buf->data.ra, priv->current_net_addr);
 589
 590         return vnt_rxtx_datahead_g(tx_context, &buf->data_head);
 591 }
 592
 593 static u16 vnt_rxtx_rts(struct vnt_usb_send_context *tx_context,
 594                         union vnt_tx_head *tx_head, bool need_mic)
 595 {
 596         struct vnt_private *priv = tx_context->priv;
 597         struct vnt_rrv_time_rts *buf = &tx_head->tx_rts.rts;
 598         union vnt_tx_data_head *head = &tx_head->tx_rts.tx.head;
 599         u32 frame_len = tx_context->frame_len;
 600         u16 current_rate = tx_context->tx_rate;
 601         u8 need_ack = tx_context->need_ack;
 602
 603         buf->rts_rrv_time_aa = vnt_get_rtscts_rsvtime_le(priv, 2,
 604                         tx_context->pkt_type, frame_len, current_rate);
 605         buf->rts_rrv_time_ba = vnt_get_rtscts_rsvtime_le(priv, 1,
 606                         tx_context->pkt_type, frame_len, current_rate);
 607         buf->rts_rrv_time_bb = vnt_get_rtscts_rsvtime_le(priv, 0,
 608                         tx_context->pkt_type, frame_len, current_rate);
 609
 610         buf->rrv_time_a = vnt_rxtx_rsvtime_le16(priv, tx_context->pkt_type,
 611                                                 frame_len, current_rate,
 612                                                 need_ack);
 613         buf->rrv_time_b = vnt_rxtx_rsvtime_le16(priv, PK_TYPE_11B, frame_len,
 614                                         priv->top_cck_basic_rate, need_ack);
 615
 616         if (need_mic)
 617                 head = &tx_head->tx_rts.tx.mic.head;
 618
 619         if (tx_context->fb_option)
 620                 return vnt_rxtx_rts_g_fb_head(tx_context, &head->rts_g_fb);
 621
 622         return vnt_rxtx_rts_g_head(tx_context, &head->rts_g);
 623 }
 624
 625 static u16 vnt_rxtx_cts(struct vnt_usb_send_context *tx_context,
 626                         union vnt_tx_head *tx_head, bool need_mic)
 627 {
 628         struct vnt_private *priv = tx_context->priv;
 629         struct vnt_rrv_time_cts *buf = &tx_head->tx_cts.cts;
 630         union vnt_tx_data_head *head = &tx_head->tx_cts.tx.head;
 631         u32 frame_len = tx_context->frame_len;
 632         u16 current_rate = tx_context->tx_rate;
 633         u8 need_ack = tx_context->need_ack;
 634
 635         buf->rrv_time_a = vnt_rxtx_rsvtime_le16(priv, tx_context->pkt_type,
 636                                         frame_len, current_rate, need_ack);
 637         buf->rrv_time_b = vnt_rxtx_rsvtime_le16(priv, PK_TYPE_11B,
 638                                 frame_len, priv->top_cck_basic_rate, need_ack);
 639
 640         buf->cts_rrv_time_ba = vnt_get_rtscts_rsvtime_le(priv, 3,
 641                         tx_context->pkt_type, frame_len, current_rate);
 642
 643         if (need_mic)
 644                 head = &tx_head->tx_cts.tx.mic.head;
 645
 646         /* Fill CTS */
 647         if (tx_context->fb_option)
 648                 return vnt_fill_cts_fb_head(tx_context, head);
 649
 650         return vnt_fill_cts_head(tx_context, head);
 651 }
 652
 653 static u16 vnt_rxtx_ab(struct vnt_usb_send_context *tx_context,
 654                        union vnt_tx_head *tx_head, bool need_rts, bool need_mic)
 655 {
 656         struct vnt_private *priv = tx_context->priv;
 657         struct vnt_rrv_time_ab *buf = &tx_head->tx_ab.ab;
 658         union vnt_tx_data_head *head = &tx_head->tx_ab.tx.head;
 659         u32 frame_len = tx_context->frame_len;
 660         u16 current_rate = tx_context->tx_rate;
 661         u8 need_ack = tx_context->need_ack;
 662
 663         buf->rrv_time = vnt_rxtx_rsvtime_le16(priv, tx_context->pkt_type,
 664                         frame_len, current_rate, need_ack);
 665
 666         if (need_mic)
 667                 head = &tx_head->tx_ab.tx.mic.head;
 668
 669         if (need_rts) {
 670                 if (tx_context->pkt_type == PK_TYPE_11B)
 671                         buf->rts_rrv_time = vnt_get_rtscts_rsvtime_le(priv, 0,
 672                                 tx_context->pkt_type, frame_len, current_rate);
 673                 else /* PK_TYPE_11A */
 674                         buf->rts_rrv_time = vnt_get_rtscts_rsvtime_le(priv, 2,
 675                                 tx_context->pkt_type, frame_len, current_rate);
 676
 677                 if (tx_context->fb_option &&
 678                     tx_context->pkt_type == PK_TYPE_11A)
 679                         return vnt_rxtx_rts_a_fb_head(tx_context,
 680                                                       &head->rts_a_fb);
 681
 682                 return vnt_rxtx_rts_ab_head(tx_context, &head->rts_ab);
 683         }
 684
 685         if (tx_context->pkt_type == PK_TYPE_11A)
 686                 return vnt_rxtx_datahead_a_fb(tx_context,
 687                                               &head->data_head_a_fb);
 688
 689         return vnt_rxtx_datahead_ab(tx_context, &head->data_head_ab);
 690 }
 691
 692 static u16 vnt_generate_tx_parameter(struct vnt_usb_send_context *tx_context,
 693                                      struct vnt_tx_buffer *tx_buffer,
 694                                      struct vnt_mic_hdr **mic_hdr, u32 need_mic,
 695                                      bool need_rts)
 696 {
 697         if (tx_context->pkt_type == PK_TYPE_11GB ||
 698             tx_context->pkt_type == PK_TYPE_11GA) {
 699                 if (need_rts) {
 700                         if (need_mic)
 701                                 *mic_hdr =
 702                                         &tx_buffer->tx_head.tx_rts.tx.mic.hdr;
 703
 704                         return vnt_rxtx_rts(tx_context, &tx_buffer->tx_head,
 705                                             need_mic);
 706                 }
 707
 708                 if (need_mic)
 709                         *mic_hdr = &tx_buffer->tx_head.tx_cts.tx.mic.hdr;
 710
 711                 return vnt_rxtx_cts(tx_context, &tx_buffer->tx_head, need_mic);
 712         }
 713
 714         if (need_mic)
 715                 *mic_hdr = &tx_buffer->tx_head.tx_ab.tx.mic.hdr;
 716
 717         return vnt_rxtx_ab(tx_context, &tx_buffer->tx_head, need_rts, need_mic);
 718 }
 719
 720 static void vnt_fill_txkey(struct vnt_usb_send_context *tx_context,
 721                            u8 *key_buffer, struct ieee80211_key_conf *tx_key,
 722                            struct sk_buff *skb, u16 payload_len,
 723                            struct vnt_mic_hdr *mic_hdr)
 724 {
 725         struct ieee80211_hdr *hdr = tx_context->hdr;
 726         u64 pn64;
 727         u8 *iv = ((u8 *)hdr + ieee80211_get_hdrlen_from_skb(skb));
 728
 729         /* strip header and icv len from payload */
 730         payload_len -= ieee80211_get_hdrlen_from_skb(skb);
 731         payload_len -= tx_key->icv_len;
 732
 733         switch (tx_key->cipher) {
 734         case WLAN_CIPHER_SUITE_WEP40:
 735         case WLAN_CIPHER_SUITE_WEP104:
 736                 memcpy(key_buffer, iv, 3);
 737                 memcpy(key_buffer + 3, tx_key->key, tx_key->keylen);
 738
 739                 if (tx_key->keylen == WLAN_KEY_LEN_WEP40) {
 740                         memcpy(key_buffer + 8, iv, 3);
 741                         memcpy(key_buffer + 11,
 742                                tx_key->key, WLAN_KEY_LEN_WEP40);
 743                 }
 744
 745                 break;
 746         case WLAN_CIPHER_SUITE_TKIP:
 747                 ieee80211_get_tkip_p2k(tx_key, skb, key_buffer);
 748
 749                 break;
 750         case WLAN_CIPHER_SUITE_CCMP:
 751
 752                 if (!mic_hdr)
 753                         return;
 754
 755                 mic_hdr->id = 0x59;
 756                 mic_hdr->payload_len = cpu_to_be16(payload_len);
 757                 ether_addr_copy(mic_hdr->mic_addr2, hdr->addr2);
 758
 759                 pn64 = atomic64_read(&tx_key->tx_pn);
 760                 mic_hdr->ccmp_pn[5] = pn64;
 761                 mic_hdr->ccmp_pn[4] = pn64 >> 8;
 762                 mic_hdr->ccmp_pn[3] = pn64 >> 16;
 763                 mic_hdr->ccmp_pn[2] = pn64 >> 24;
 764                 mic_hdr->ccmp_pn[1] = pn64 >> 32;
 765                 mic_hdr->ccmp_pn[0] = pn64 >> 40;
 766
 767                 if (ieee80211_has_a4(hdr->frame_control))
 768                         mic_hdr->hlen = cpu_to_be16(28);
 769                 else
 770                         mic_hdr->hlen = cpu_to_be16(22);
 771
 772                 ether_addr_copy(mic_hdr->addr1, hdr->addr1);
 773                 ether_addr_copy(mic_hdr->addr2, hdr->addr2);
 774                 ether_addr_copy(mic_hdr->addr3, hdr->addr3);
 775
 776                 mic_hdr->frame_control = cpu_to_le16(
 777                         le16_to_cpu(hdr->frame_control) & 0xc78f);
 778                 mic_hdr->seq_ctrl = cpu_to_le16(
 779                                 le16_to_cpu(hdr->seq_ctrl) & 0xf);
 780
 781                 if (ieee80211_has_a4(hdr->frame_control))
 782                         ether_addr_copy(mic_hdr->addr4, hdr->addr4);
 783
 784                 memcpy(key_buffer, tx_key->key, WLAN_KEY_LEN_CCMP);
 785
 786                 break;
 787         default:
 788                 break;
 789         }
 790 }
 791
 792 int vnt_tx_packet(struct vnt_private *priv, struct sk_buff *skb)
 793 {
 794         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 795         struct ieee80211_tx_rate *tx_rate = &info->control.rates[0];
 796         struct ieee80211_rate *rate;
 797         struct ieee80211_key_conf *tx_key;
 798         struct ieee80211_hdr *hdr;
 799         struct vnt_mic_hdr *mic_hdr = NULL;
 800         struct vnt_tx_buffer *tx_buffer;
 801         struct vnt_tx_fifo_head *tx_buffer_head;
 802         struct vnt_usb_send_context *tx_context;
 803         unsigned long flags;
 804         u16 tx_bytes, tx_header_size, tx_body_size, current_rate, duration_id;
 805         u8 pkt_type, fb_option = AUTO_FB_NONE;
 806         bool need_rts = false, is_pspoll = false;
 807         bool need_mic = false;
 808
 809         hdr = (struct ieee80211_hdr *)(skb->data);
 810
 811         rate = ieee80211_get_tx_rate(priv->hw, info);
 812
 813         current_rate = rate->hw_value;
 814         if (priv->current_rate != current_rate &&
 815             !(priv->hw->conf.flags & IEEE80211_CONF_OFFCHANNEL)) {
 816                 priv->current_rate = current_rate;
 817                 vnt_schedule_command(priv, WLAN_CMD_SETPOWER);
 818         }
 819
 820         if (current_rate > RATE_11M) {
 821                 if (info->band == NL80211_BAND_5GHZ) {
 822                         pkt_type = PK_TYPE_11A;
 823                 } else {
 824                         if (tx_rate->flags & IEEE80211_TX_RC_USE_CTS_PROTECT) {
 825                                 if (priv->basic_rates & VNT_B_RATES)
 826                                         pkt_type = PK_TYPE_11GB;
 827                                 else
 828                                         pkt_type = PK_TYPE_11GA;
 829                         } else {
 830                                 pkt_type = PK_TYPE_11A;
 831                         }
 832                 }
 833         } else {
 834                 pkt_type = PK_TYPE_11B;
 835         }
 836
 837         spin_lock_irqsave(&priv->lock, flags);
 838
 839         tx_context = vnt_get_free_context(priv);
 840         if (!tx_context) {
 841                 dev_dbg(&priv->usb->dev, "%s No free context\n", __func__);
 842                 spin_unlock_irqrestore(&priv->lock, flags);
 843                 return -ENOMEM;
 844         }
 845
 846         tx_context->skb = skb;
 847         tx_context->pkt_type = pkt_type;
 848         tx_context->need_ack = false;
 849         tx_context->frame_len = skb->len + 4;
 850         tx_context->tx_rate = current_rate;
 851
 852         spin_unlock_irqrestore(&priv->lock, flags);
 853
 854         tx_buffer = (struct vnt_tx_buffer *)tx_context->data;
 855         tx_buffer_head = &tx_buffer->fifo_head;
 856         tx_body_size = skb->len;
 857
 858         /*Set fifo controls */
 859         if (pkt_type == PK_TYPE_11A)
 860                 tx_buffer_head->fifo_ctl = 0;
 861         else if (pkt_type == PK_TYPE_11B)
 862                 tx_buffer_head->fifo_ctl = cpu_to_le16(FIFOCTL_11B);
 863         else if (pkt_type == PK_TYPE_11GB)
 864                 tx_buffer_head->fifo_ctl = cpu_to_le16(FIFOCTL_11GB);
 865         else if (pkt_type == PK_TYPE_11GA)
 866                 tx_buffer_head->fifo_ctl = cpu_to_le16(FIFOCTL_11GA);
 867
 868         if (!ieee80211_is_data(hdr->frame_control)) {
 869                 tx_buffer_head->fifo_ctl |= cpu_to_le16(FIFOCTL_GENINT |
 870                                                         FIFOCTL_ISDMA0);
 871                 tx_buffer_head->fifo_ctl |= cpu_to_le16(FIFOCTL_TMOEN);
 872
 873                 tx_buffer_head->time_stamp =
 874                         cpu_to_le16(DEFAULT_MGN_LIFETIME_RES_64us);
 875         } else {
 876                 tx_buffer_head->time_stamp =
 877                         cpu_to_le16(DEFAULT_MSDU_LIFETIME_RES_64us);
 878         }
 879
 880         if (!(info->flags & IEEE80211_TX_CTL_NO_ACK)) {
 881                 tx_buffer_head->fifo_ctl |= cpu_to_le16(FIFOCTL_NEEDACK);
 882                 tx_context->need_ack = true;
 883         }
 884
 885         if (ieee80211_has_retry(hdr->frame_control))
 886                 tx_buffer_head->fifo_ctl |= cpu_to_le16(FIFOCTL_LRETRY);
 887
 888         if (tx_rate->flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)
 889                 priv->preamble_type = PREAMBLE_SHORT;
 890         else
 891                 priv->preamble_type = PREAMBLE_LONG;
 892
 893         if (tx_rate->flags & IEEE80211_TX_RC_USE_RTS_CTS) {
 894                 need_rts = true;
 895                 tx_buffer_head->fifo_ctl |= cpu_to_le16(FIFOCTL_RTS);
 896         }
 897
 898         if (ieee80211_has_a4(hdr->frame_control))
 899                 tx_buffer_head->fifo_ctl |= cpu_to_le16(FIFOCTL_LHEAD);
 900
 901         if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER)
 902                 is_pspoll = true;
 903
 904         tx_buffer_head->frag_ctl =
 905                         cpu_to_le16(ieee80211_get_hdrlen_from_skb(skb) << 10);
 906
 907         if (info->control.hw_key) {
 908                 tx_key = info->control.hw_key;
 909                 switch (info->control.hw_key->cipher) {
 910                 case WLAN_CIPHER_SUITE_WEP40:
 911                 case WLAN_CIPHER_SUITE_WEP104:
 912                         tx_buffer_head->frag_ctl |= cpu_to_le16(FRAGCTL_LEGACY);
 913                         break;
 914                 case WLAN_CIPHER_SUITE_TKIP:
 915                         tx_buffer_head->frag_ctl |= cpu_to_le16(FRAGCTL_TKIP);
 916                         break;
 917                 case WLAN_CIPHER_SUITE_CCMP:
 918                         tx_buffer_head->frag_ctl |= cpu_to_le16(FRAGCTL_AES);
 919                         need_mic = true;
 920                 default:
 921                         break;
 922                 }
 923                 tx_context->frame_len += tx_key->icv_len;
 924         }
 925
 926         tx_buffer_head->current_rate = cpu_to_le16(current_rate);
 927
 928         /* legacy rates TODO use ieee80211_tx_rate */
 929         if (current_rate >= RATE_18M && ieee80211_is_data(hdr->frame_control)) {
 930                 if (priv->auto_fb_ctrl == AUTO_FB_0) {
 931                         tx_buffer_head->fifo_ctl |=
 932                                                 cpu_to_le16(FIFOCTL_AUTO_FB_0);
 933
 934                         priv->tx_rate_fb0 =
 935                                 vnt_fb_opt0[FB_RATE0][current_rate - RATE_18M];
 936                         priv->tx_rate_fb1 =
 937                                 vnt_fb_opt0[FB_RATE1][current_rate - RATE_18M];
 938
 939                         fb_option = AUTO_FB_0;
 940                 } else if (priv->auto_fb_ctrl == AUTO_FB_1) {
 941                         tx_buffer_head->fifo_ctl |=
 942                                                 cpu_to_le16(FIFOCTL_AUTO_FB_1);
 943
 944                         priv->tx_rate_fb0 =
 945                                 vnt_fb_opt1[FB_RATE0][current_rate - RATE_18M];
 946                         priv->tx_rate_fb1 =
 947                                 vnt_fb_opt1[FB_RATE1][current_rate - RATE_18M];
 948
 949                         fb_option = AUTO_FB_1;
 950                 }
 951         }
 952
 953         tx_context->fb_option = fb_option;
 954
 955         duration_id = vnt_generate_tx_parameter(tx_context, tx_buffer, &mic_hdr,
 956                                                 need_mic, need_rts);
 957
 958         tx_header_size = tx_context->tx_hdr_size;
 959         if (!tx_header_size) {
 960                 tx_context->in_use = false;
 961                 return -ENOMEM;
 962         }
 963
 964         tx_buffer_head->frag_ctl |= cpu_to_le16(FRAGCTL_NONFRAG);
 965
 966         tx_bytes = tx_header_size + tx_body_size;
 967
 968         memcpy(tx_context->hdr, skb->data, tx_body_size);
 969
 970         hdr->duration_id = cpu_to_le16(duration_id);
 971
 972         if (info->control.hw_key) {
 973                 tx_key = info->control.hw_key;
 974                 if (tx_key->keylen > 0)
 975                         vnt_fill_txkey(tx_context, tx_buffer_head->tx_key,
 976                                        tx_key, skb, tx_body_size, mic_hdr);
 977         }
 978
 979         priv->seq_counter = (le16_to_cpu(hdr->seq_ctrl) &
 980                                                 IEEE80211_SCTL_SEQ) >> 4;
 981
 982         tx_buffer->tx_byte_count = cpu_to_le16(tx_bytes);
 983         tx_buffer->pkt_no = tx_context->pkt_no;
 984         tx_buffer->type = 0x00;
 985
 986         tx_bytes += 4;
 987
 988         tx_context->type = CONTEXT_DATA_PACKET;
 989         tx_context->buf_len = tx_bytes;
 990
 991         spin_lock_irqsave(&priv->lock, flags);
 992
 993         if (vnt_tx_context(priv, tx_context) != STATUS_PENDING) {
 994                 spin_unlock_irqrestore(&priv->lock, flags);
 995                 return -EIO;
 996         }
 997
 998         spin_unlock_irqrestore(&priv->lock, flags);
 999
1000         return 0;
1001 }
1002
1003 static int vnt_beacon_xmit(struct vnt_private *priv, struct sk_buff *skb)
1004 {
1005         struct vnt_beacon_buffer *beacon_buffer;
1006         struct vnt_tx_short_buf_head *short_head;
1007         struct ieee80211_tx_info *info;
1008         struct vnt_usb_send_context *context;
1009         struct ieee80211_mgmt *mgmt_hdr;
1010         unsigned long flags;
1011         u32 frame_size = skb->len + 4;
1012         u16 current_rate, count;
1013
1014         spin_lock_irqsave(&priv->lock, flags);
1015
1016         context = vnt_get_free_context(priv);
1017         if (!context) {
1018                 dev_dbg(&priv->usb->dev, "%s No free context!\n", __func__);
1019                 spin_unlock_irqrestore(&priv->lock, flags);
1020                 return -ENOMEM;
1021         }
1022
1023         context->skb = skb;
1024
1025         spin_unlock_irqrestore(&priv->lock, flags);
1026
1027         beacon_buffer = (struct vnt_beacon_buffer *)&context->data[0];
1028         short_head = &beacon_buffer->short_head;
1029
1030         if (priv->bb_type == BB_TYPE_11A) {
1031                 current_rate = RATE_6M;
1032
1033                 /* Get SignalField,ServiceField,Length */
1034                 vnt_get_phy_field(priv, frame_size, current_rate,
1035                                   PK_TYPE_11A, &short_head->ab);
1036
1037                 /* Get Duration and TimeStampOff */
1038                 short_head->duration = vnt_get_duration_le(priv,
1039                                                            PK_TYPE_11A, false);
1040                 short_head->time_stamp_off =
1041                                 vnt_time_stamp_off(priv, current_rate);
1042         } else {
1043                 current_rate = RATE_1M;
1044                 short_head->fifo_ctl |= cpu_to_le16(FIFOCTL_11B);
1045
1046                 /* Get SignalField,ServiceField,Length */
1047                 vnt_get_phy_field(priv, frame_size, current_rate,
1048                                   PK_TYPE_11B, &short_head->ab);
1049
1050                 /* Get Duration and TimeStampOff */
1051                 short_head->duration = vnt_get_duration_le(priv,
1052                                                 PK_TYPE_11B, false);
1053                 short_head->time_stamp_off =
1054                         vnt_time_stamp_off(priv, current_rate);
1055         }
1056
1057         /* Generate Beacon Header */
1058         mgmt_hdr = &beacon_buffer->mgmt_hdr;
1059         memcpy(mgmt_hdr, skb->data, skb->len);
1060
1061         /* time stamp always 0 */
1062         mgmt_hdr->u.beacon.timestamp = 0;
1063
1064         info = IEEE80211_SKB_CB(skb);
1065         if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ) {
1066                 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)mgmt_hdr;
1067
1068                 hdr->duration_id = 0;
1069                 hdr->seq_ctrl = cpu_to_le16(priv->seq_counter << 4);
1070         }
1071
1072         priv->seq_counter++;
1073         if (priv->seq_counter > 0x0fff)
1074                 priv->seq_counter = 0;
1075
1076         count = sizeof(struct vnt_tx_short_buf_head) + skb->len;
1077
1078         beacon_buffer->tx_byte_count = cpu_to_le16(count);
1079         beacon_buffer->pkt_no = context->pkt_no;
1080         beacon_buffer->type = 0x01;
1081
1082         context->type = CONTEXT_BEACON_PACKET;
1083         context->buf_len = count + 4; /* USB header */
1084
1085         spin_lock_irqsave(&priv->lock, flags);
1086
1087         if (vnt_tx_context(priv, context) != STATUS_PENDING)
1088                 ieee80211_free_txskb(priv->hw, context->skb);
1089
1090         spin_unlock_irqrestore(&priv->lock, flags);
1091
1092         return 0;
1093 }
1094
1095 int vnt_beacon_make(struct vnt_private *priv, struct ieee80211_vif *vif)
1096 {
1097         struct sk_buff *beacon;
1098
1099         beacon = ieee80211_beacon_get(priv->hw, vif);
1100         if (!beacon)
1101                 return -ENOMEM;
1102
1103         if (vnt_beacon_xmit(priv, beacon)) {
1104                 ieee80211_free_txskb(priv->hw, beacon);
1105                 return -ENODEV;
1106         }
1107
1108         return 0;
1109 }
1110
1111 int vnt_beacon_enable(struct vnt_private *priv, struct ieee80211_vif *vif,
1112                       struct ieee80211_bss_conf *conf)
1113 {
1114         vnt_mac_reg_bits_off(priv, MAC_REG_TCR, TCR_AUTOBCNTX);
1115
1116         vnt_mac_reg_bits_off(priv, MAC_REG_TFTCTL, TFTCTL_TSFCNTREN);
1117
1118         vnt_mac_set_beacon_interval(priv, conf->beacon_int);
1119
1120         vnt_clear_current_tsf(priv);
1121
1122         vnt_mac_reg_bits_on(priv, MAC_REG_TFTCTL, TFTCTL_TSFCNTREN);
1123
1124         vnt_reset_next_tbtt(priv, conf->beacon_int);
1125
1126         return vnt_beacon_make(priv, vif);
1127 }