kernel/drivers/staging/vt6656/rxtx.c

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