SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/net/wireless/p54/txrx.c

   1 /*
   2  * Common code for mac80211 Prism54 drivers
   3  *
   4  * Copyright (c) 2006, Michael Wu <flamingice@sourmilk.net>
   5  * Copyright (c) 2007-2009, Christian Lamparter <chunkeey@web.de>
   6  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
   7  *
   8  * Based on:
   9  * - the islsm (softmac prism54) driver, which is:
  10  *   Copyright 2004-2006 Jean-Baptiste Note <jbnote@gmail.com>, et al.
  11  * - stlc45xx driver
  12  *   Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies).
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License version 2 as
  16  * published by the Free Software Foundation.
  17  */
  18
  19 #include <linux/init.h>
  20 #include <linux/firmware.h>
  21 #include <linux/etherdevice.h>
  22
  23 #include <net/mac80211.h>
  24
  25 #include "p54.h"
  26 #include "lmac.h"
  27
  28 #ifdef P54_MM_DEBUG
  29 static void p54_dump_tx_queue(struct p54_common *priv)
  30 {
  31         unsigned long flags;
  32         struct ieee80211_tx_info *info;
  33         struct p54_tx_info *range;
  34         struct sk_buff *skb;
  35         struct p54_hdr *hdr;
  36         unsigned int i = 0;
  37         u32 prev_addr;
  38         u32 largest_hole = 0, free;
  39
  40         spin_lock_irqsave(&priv->tx_queue.lock, flags);
  41         printk(KERN_DEBUG "%s: / --- tx queue dump (%d entries) --- \n",
  42                wiphy_name(priv->hw->wiphy), skb_queue_len(&priv->tx_queue));
  43
  44         prev_addr = priv->rx_start;
  45         skb_queue_walk(&priv->tx_queue, skb) {
  46                 info = IEEE80211_SKB_CB(skb);
  47                 range = (void *) info->rate_driver_data;
  48                 hdr = (void *) skb->data;
  49
  50                 free = range->start_addr - prev_addr;
  51                 printk(KERN_DEBUG "%s: | [%02d] => [skb:%p skb_len:0x%04x "
  52                        "hdr:{flags:%02x len:%04x req_id:%04x type:%02x} "
  53                        "mem:{start:%04x end:%04x, free:%d}]\n",
  54                        wiphy_name(priv->hw->wiphy), i++, skb, skb->len,
  55                        le16_to_cpu(hdr->flags), le16_to_cpu(hdr->len),
  56                        le32_to_cpu(hdr->req_id), le16_to_cpu(hdr->type),
  57                        range->start_addr, range->end_addr, free);
  58
  59                 prev_addr = range->end_addr;
  60                 largest_hole = max(largest_hole, free);
  61         }
  62         free = priv->rx_end - prev_addr;
  63         largest_hole = max(largest_hole, free);
  64         printk(KERN_DEBUG "%s: \\ --- [free: %d], largest free block: %d ---\n",
  65                wiphy_name(priv->hw->wiphy), free, largest_hole);
  66         spin_unlock_irqrestore(&priv->tx_queue.lock, flags);
  67 }
  68 #endif /* P54_MM_DEBUG */
  69
  70 /*
  71  * So, the firmware is somewhat stupid and doesn't know what places in its
  72  * memory incoming data should go to. By poking around in the firmware, we
  73  * can find some unused memory to upload our packets to. However, data that we
  74  * want the card to TX needs to stay intact until the card has told us that
  75  * it is done with it. This function finds empty places we can upload to and
  76  * marks allocated areas as reserved if necessary. p54_find_and_unlink_skb or
  77  * p54_free_skb frees allocated areas.
  78  */
  79 static int p54_assign_address(struct p54_common *priv, struct sk_buff *skb)
  80 {
  81         struct sk_buff *entry, *target_skb = NULL;
  82         struct ieee80211_tx_info *info;
  83         struct p54_tx_info *range;
  84         struct p54_hdr *data = (void *) skb->data;
  85         unsigned long flags;
  86         u32 last_addr = priv->rx_start;
  87         u32 target_addr = priv->rx_start;
  88         u16 len = priv->headroom + skb->len + priv->tailroom + 3;
  89
  90         if (unlikely(WARN_ON(!skb || !priv)))
  91                 return -EINVAL;
  92
  93         info = IEEE80211_SKB_CB(skb);
  94         range = (void *) info->rate_driver_data;
  95         len = (range->extra_len + len) & ~0x3;
  96
  97         spin_lock_irqsave(&priv->tx_queue.lock, flags);
  98         if (unlikely(skb_queue_len(&priv->tx_queue) == 32)) {
  99                 /*
 100                  * The tx_queue is now really full.
 101                  *
 102                  * TODO: check if the device has crashed and reset it.
 103                  */
 104                 spin_unlock_irqrestore(&priv->tx_queue.lock, flags);
 105                 return -EBUSY;
 106         }
 107
 108         skb_queue_walk(&priv->tx_queue, entry) {
 109                 u32 hole_size;
 110                 info = IEEE80211_SKB_CB(entry);
 111                 range = (void *) info->rate_driver_data;
 112                 hole_size = range->start_addr - last_addr;
 113
 114                 if (!entry->next) {
 115                         spin_unlock_irqrestore(&priv->tx_queue.lock, flags);
 116                         return -ENOSPC;
 117                 }
 118
 119                 if (!target_skb && hole_size >= len) {
 120                         target_skb = entry->prev;
 121                         hole_size -= len;
 122                         target_addr = last_addr;
 123                         break;
 124                 }
 125                 last_addr = range->end_addr;
 126         }
 127         if (unlikely(!target_skb)) {
 128                 if (priv->rx_end - last_addr >= len) {
 129                         target_skb = priv->tx_queue.prev;
 130                         if (!skb_queue_empty(&priv->tx_queue)) {
 131                                 info = IEEE80211_SKB_CB(target_skb);
 132                                 range = (void *)info->rate_driver_data;
 133                                 target_addr = range->end_addr;
 134                         }
 135                 } else {
 136                         spin_unlock_irqrestore(&priv->tx_queue.lock, flags);
 137                         return -ENOSPC;
 138                 }
 139         }
 140
 141         info = IEEE80211_SKB_CB(skb);
 142         range = (void *) info->rate_driver_data;
 143         range->start_addr = target_addr;
 144         range->end_addr = target_addr + len;
 145         __skb_queue_after(&priv->tx_queue, target_skb, skb);
 146         spin_unlock_irqrestore(&priv->tx_queue.lock, flags);
 147         data->req_id = cpu_to_le32(target_addr + priv->headroom);
 148         return 0;
 149 }
 150
 151 static void p54_tx_pending(struct p54_common *priv)
 152 {
 153         struct sk_buff *skb;
 154         int ret;
 155
 156         if (unlikely(WARN_ON(!priv)))
 157                 return ;
 158
 159         skb = skb_dequeue(&priv->tx_pending);
 160         if (unlikely(!skb))
 161                 return ;
 162
 163         ret = p54_assign_address(priv, skb);
 164         if (unlikely(ret))
 165                 skb_queue_head(&priv->tx_pending, skb);
 166         else
 167                 priv->tx(priv->hw, skb);
 168 }
 169
 170 static void p54_wake_queues(struct p54_common *priv)
 171 {
 172         unsigned long flags;
 173         unsigned int i;
 174
 175         if (unlikely(priv->mode == NL80211_IFTYPE_UNSPECIFIED))
 176                 return ;
 177
 178         p54_tx_pending(priv);
 179
 180         spin_lock_irqsave(&priv->tx_stats_lock, flags);
 181         for (i = 0; i < priv->hw->queues; i++) {
 182                 if (priv->tx_stats[i + P54_QUEUE_DATA].len <
 183                     priv->tx_stats[i + P54_QUEUE_DATA].limit)
 184                         ieee80211_wake_queue(priv->hw, i);
 185         }
 186         spin_unlock_irqrestore(&priv->tx_stats_lock, flags);
 187 }
 188
 189 static int p54_tx_qos_accounting_alloc(struct p54_common *priv,
 190                                        struct sk_buff *skb,
 191                                        const u16 p54_queue)
 192 {
 193         struct ieee80211_tx_queue_stats *queue;
 194         unsigned long flags;
 195
 196         if (WARN_ON(p54_queue > P54_QUEUE_NUM))
 197                 return -EINVAL;
 198
 199         queue = &priv->tx_stats[p54_queue];
 200
 201         spin_lock_irqsave(&priv->tx_stats_lock, flags);
 202         if (unlikely(queue->len > queue->limit && IS_QOS_QUEUE(p54_queue))) {
 203                 spin_unlock_irqrestore(&priv->tx_stats_lock, flags);
 204                 return -ENOSPC;
 205         }
 206
 207         queue->len++;
 208         queue->count++;
 209
 210         if (unlikely(queue->len == queue->limit && IS_QOS_QUEUE(p54_queue))) {
 211                 u16 ac_queue = p54_queue - P54_QUEUE_DATA;
 212                 ieee80211_stop_queue(priv->hw, ac_queue);
 213         }
 214
 215         spin_unlock_irqrestore(&priv->tx_stats_lock, flags);
 216         return 0;
 217 }
 218
 219 static void p54_tx_qos_accounting_free(struct p54_common *priv,
 220                                        struct sk_buff *skb)
 221 {
 222         if (skb && IS_DATA_FRAME(skb)) {
 223                 struct p54_hdr *hdr = (void *) skb->data;
 224                 struct p54_tx_data *data = (void *) hdr->data;
 225
 226                 priv->tx_stats[data->hw_queue].len--;
 227         }
 228         p54_wake_queues(priv);
 229 }
 230
 231 void p54_free_skb(struct ieee80211_hw *dev, struct sk_buff *skb)
 232 {
 233         struct p54_common *priv = dev->priv;
 234         if (unlikely(!skb))
 235                 return ;
 236
 237         skb_unlink(skb, &priv->tx_queue);
 238         p54_tx_qos_accounting_free(priv, skb);
 239         dev_kfree_skb_any(skb);
 240 }
 241 EXPORT_SYMBOL_GPL(p54_free_skb);
 242
 243 static struct sk_buff *p54_find_and_unlink_skb(struct p54_common *priv,
 244                                                const __le32 req_id)
 245 {
 246         struct sk_buff *entry;
 247         unsigned long flags;
 248
 249         spin_lock_irqsave(&priv->tx_queue.lock, flags);
 250         skb_queue_walk(&priv->tx_queue, entry) {
 251                 struct p54_hdr *hdr = (struct p54_hdr *) entry->data;
 252
 253                 if (hdr->req_id == req_id) {
 254                         __skb_unlink(entry, &priv->tx_queue);
 255                         spin_unlock_irqrestore(&priv->tx_queue.lock, flags);
 256                         p54_tx_qos_accounting_free(priv, entry);
 257                         return entry;
 258                 }
 259         }
 260         spin_unlock_irqrestore(&priv->tx_queue.lock, flags);
 261         return NULL;
 262 }
 263
 264 void p54_tx(struct p54_common *priv, struct sk_buff *skb)
 265 {
 266         if (unlikely(WARN_ON(!priv)))
 267                 return ;
 268
 269         skb_queue_tail(&priv->tx_pending, skb);
 270         p54_tx_pending(priv);
 271 }
 272
 273 static int p54_rssi_to_dbm(struct p54_common *priv, int rssi)
 274 {
 275         int band = priv->hw->conf.channel->band;
 276
 277         if (priv->rxhw != 5)
 278                 return ((rssi * priv->rssical_db[band].mul) / 64 +
 279                          priv->rssical_db[band].add) / 4;
 280         else
 281                 /*
 282                  * TODO: find the correct formula
 283                  */
 284                 return ((rssi * priv->rssical_db[band].mul) / 64 +
 285                          priv->rssical_db[band].add) / 4;
 286 }
 287
 288 static int p54_rx_data(struct p54_common *priv, struct sk_buff *skb)
 289 {
 290         struct p54_rx_data *hdr = (struct p54_rx_data *) skb->data;
 291         struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
 292         u16 freq = le16_to_cpu(hdr->freq);
 293         size_t header_len = sizeof(*hdr);
 294         u32 tsf32;
 295         u8 rate = hdr->rate & 0xf;
 296
 297         /*
 298          * If the device is in a unspecified state we have to
 299          * ignore all data frames. Else we could end up with a
 300          * nasty crash.
 301          */
 302         if (unlikely(priv->mode == NL80211_IFTYPE_UNSPECIFIED))
 303                 return 0;
 304
 305         if (!(hdr->flags & cpu_to_le16(P54_HDR_FLAG_DATA_IN_FCS_GOOD)))
 306                 return 0;
 307
 308         if (hdr->decrypt_status == P54_DECRYPT_OK)
 309                 rx_status->flag |= RX_FLAG_DECRYPTED;
 310         if ((hdr->decrypt_status == P54_DECRYPT_FAIL_MICHAEL) ||
 311             (hdr->decrypt_status == P54_DECRYPT_FAIL_TKIP))
 312                 rx_status->flag |= RX_FLAG_MMIC_ERROR;
 313
 314         rx_status->signal = p54_rssi_to_dbm(priv, hdr->rssi);
 315         rx_status->noise = priv->noise;
 316         if (hdr->rate & 0x10)
 317                 rx_status->flag |= RX_FLAG_SHORTPRE;
 318         if (priv->hw->conf.channel->band == IEEE80211_BAND_5GHZ)
 319                 rx_status->rate_idx = (rate < 4) ? 0 : rate - 4;
 320         else
 321                 rx_status->rate_idx = rate;
 322
 323         rx_status->freq = freq;
 324         rx_status->band =  priv->hw->conf.channel->band;
 325         rx_status->antenna = hdr->antenna;
 326
 327         tsf32 = le32_to_cpu(hdr->tsf32);
 328         if (tsf32 < priv->tsf_low32)
 329                 priv->tsf_high32++;
 330         rx_status->mactime = ((u64)priv->tsf_high32) << 32 | tsf32;
 331         priv->tsf_low32 = tsf32;
 332
 333         rx_status->flag |= RX_FLAG_TSFT;
 334
 335         if (hdr->flags & cpu_to_le16(P54_HDR_FLAG_DATA_ALIGN))
 336                 header_len += hdr->align[0];
 337
 338         skb_pull(skb, header_len);
 339         skb_trim(skb, le16_to_cpu(hdr->len));
 340         ieee80211_rx_irqsafe(priv->hw, skb);
 341
 342         queue_delayed_work(priv->hw->workqueue, &priv->work,
 343                            msecs_to_jiffies(P54_STATISTICS_UPDATE));
 344
 345         return -1;
 346 }
 347
 348 static void p54_rx_frame_sent(struct p54_common *priv, struct sk_buff *skb)
 349 {
 350         struct p54_hdr *hdr = (struct p54_hdr *) skb->data;
 351         struct p54_frame_sent *payload = (struct p54_frame_sent *) hdr->data;
 352         struct ieee80211_tx_info *info;
 353         struct p54_hdr *entry_hdr;
 354         struct p54_tx_data *entry_data;
 355         struct sk_buff *entry;
 356         unsigned int pad = 0, frame_len;
 357         int count, idx;
 358
 359         entry = p54_find_and_unlink_skb(priv, hdr->req_id);
 360         if (unlikely(!entry))
 361                 return ;
 362
 363         frame_len = entry->len;
 364         info = IEEE80211_SKB_CB(entry);
 365         entry_hdr = (struct p54_hdr *) entry->data;
 366         entry_data = (struct p54_tx_data *) entry_hdr->data;
 367         priv->stats.dot11ACKFailureCount += payload->tries - 1;
 368
 369         /*
 370          * Frames in P54_QUEUE_FWSCAN and P54_QUEUE_BEACON are
 371          * generated by the driver. Therefore tx_status is bogus
 372          * and we don't want to confuse the mac80211 stack.
 373          */
 374         if (unlikely(entry_data->hw_queue < P54_QUEUE_FWSCAN)) {
 375                 if (entry_data->hw_queue == P54_QUEUE_BEACON &&
 376                     hdr->req_id == priv->beacon_req_id)
 377                         priv->beacon_req_id = cpu_to_le32(0);
 378
 379                 dev_kfree_skb_any(entry);
 380                 return ;
 381         }
 382
 383         /*
 384          * Clear manually, ieee80211_tx_info_clear_status would
 385          * clear the counts too and we need them.
 386          */
 387         memset(&info->status.ampdu_ack_len, 0,
 388                sizeof(struct ieee80211_tx_info) -
 389                offsetof(struct ieee80211_tx_info, status.ampdu_ack_len));
 390         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info,
 391                               status.ampdu_ack_len) != 23);
 392
 393         if (entry_hdr->flags & cpu_to_le16(P54_HDR_FLAG_DATA_ALIGN))
 394                 pad = entry_data->align[0];
 395
 396         /* walk through the rates array and adjust the counts */
 397         count = payload->tries;
 398         for (idx = 0; idx < 4; idx++) {
 399                 if (count >= info->status.rates[idx].count) {
 400                         count -= info->status.rates[idx].count;
 401                 } else if (count > 0) {
 402                         info->status.rates[idx].count = count;
 403                         count = 0;
 404                 } else {
 405                         info->status.rates[idx].idx = -1;
 406                         info->status.rates[idx].count = 0;
 407                 }
 408         }
 409
 410         if (!(info->flags & IEEE80211_TX_CTL_NO_ACK) &&
 411              (!payload->status))
 412                 info->flags |= IEEE80211_TX_STAT_ACK;
 413         if (payload->status & P54_TX_PSM_CANCELLED)
 414                 info->flags |= IEEE80211_TX_STAT_TX_FILTERED;
 415         info->status.ack_signal = p54_rssi_to_dbm(priv,
 416                                                   (int)payload->ack_rssi);
 417
 418         /* Undo all changes to the frame. */
 419         switch (entry_data->key_type) {
 420         case P54_CRYPTO_TKIPMICHAEL: {
 421                 u8 *iv = (u8 *)(entry_data->align + pad +
 422                                 entry_data->crypt_offset);
 423
 424                 /* Restore the original TKIP IV. */
 425                 iv[2] = iv[0];
 426                 iv[0] = iv[1];
 427                 iv[1] = (iv[0] | 0x20) & 0x7f;  /* WEPSeed - 8.3.2.2 */
 428
 429                 frame_len -= 12; /* remove TKIP_MMIC + TKIP_ICV */
 430                 break;
 431                 }
 432         case P54_CRYPTO_AESCCMP:
 433                 frame_len -= 8; /* remove CCMP_MIC */
 434                 break;
 435         case P54_CRYPTO_WEP:
 436                 frame_len -= 4; /* remove WEP_ICV */
 437                 break;
 438         }
 439
 440         skb_trim(entry, frame_len);
 441         skb_pull(entry, sizeof(*hdr) + pad + sizeof(*entry_data));
 442         ieee80211_tx_status_irqsafe(priv->hw, entry);
 443 }
 444
 445 static void p54_rx_eeprom_readback(struct p54_common *priv,
 446                                    struct sk_buff *skb)
 447 {
 448         struct p54_hdr *hdr = (struct p54_hdr *) skb->data;
 449         struct p54_eeprom_lm86 *eeprom = (struct p54_eeprom_lm86 *) hdr->data;
 450         struct sk_buff *tmp;
 451
 452         if (!priv->eeprom)
 453                 return ;
 454
 455         if (priv->fw_var >= 0x509) {
 456                 memcpy(priv->eeprom, eeprom->v2.data,
 457                        le16_to_cpu(eeprom->v2.len));
 458         } else {
 459                 memcpy(priv->eeprom, eeprom->v1.data,
 460                        le16_to_cpu(eeprom->v1.len));
 461         }
 462
 463         priv->eeprom = NULL;
 464         tmp = p54_find_and_unlink_skb(priv, hdr->req_id);
 465         p54_tx_qos_accounting_free(priv, tmp);
 466         dev_kfree_skb_any(tmp);
 467         complete(&priv->eeprom_comp);
 468 }
 469
 470 static void p54_rx_stats(struct p54_common *priv, struct sk_buff *skb)
 471 {
 472         struct p54_hdr *hdr = (struct p54_hdr *) skb->data;
 473         struct p54_statistics *stats = (struct p54_statistics *) hdr->data;
 474         struct sk_buff *tmp;
 475         u32 tsf32;
 476
 477         if (unlikely(priv->mode == NL80211_IFTYPE_UNSPECIFIED))
 478                 return ;
 479
 480         tsf32 = le32_to_cpu(stats->tsf32);
 481         if (tsf32 < priv->tsf_low32)
 482                 priv->tsf_high32++;
 483         priv->tsf_low32 = tsf32;
 484
 485         priv->stats.dot11RTSFailureCount = le32_to_cpu(stats->rts_fail);
 486         priv->stats.dot11RTSSuccessCount = le32_to_cpu(stats->rts_success);
 487         priv->stats.dot11FCSErrorCount = le32_to_cpu(stats->rx_bad_fcs);
 488
 489         priv->noise = p54_rssi_to_dbm(priv, le32_to_cpu(stats->noise));
 490
 491         tmp = p54_find_and_unlink_skb(priv, hdr->req_id);
 492         p54_tx_qos_accounting_free(priv, tmp);
 493         dev_kfree_skb_any(tmp);
 494 }
 495
 496 static void p54_rx_trap(struct p54_common *priv, struct sk_buff *skb)
 497 {
 498         struct p54_hdr *hdr = (struct p54_hdr *) skb->data;
 499         struct p54_trap *trap = (struct p54_trap *) hdr->data;
 500         u16 event = le16_to_cpu(trap->event);
 501         u16 freq = le16_to_cpu(trap->frequency);
 502
 503         switch (event) {
 504         case P54_TRAP_BEACON_TX:
 505                 break;
 506         case P54_TRAP_RADAR:
 507                 printk(KERN_INFO "%s: radar (freq:%d MHz)\n",
 508                         wiphy_name(priv->hw->wiphy), freq);
 509                 break;
 510         case P54_TRAP_NO_BEACON:
 511                 if (priv->vif)
 512                         ieee80211_beacon_loss(priv->vif);
 513                 break;
 514         case P54_TRAP_SCAN:
 515                 break;
 516         case P54_TRAP_TBTT:
 517                 break;
 518         case P54_TRAP_TIMER:
 519                 break;
 520         default:
 521                 printk(KERN_INFO "%s: received event:%x freq:%d\n",
 522                        wiphy_name(priv->hw->wiphy), event, freq);
 523                 break;
 524         }
 525 }
 526
 527 static int p54_rx_control(struct p54_common *priv, struct sk_buff *skb)
 528 {
 529         struct p54_hdr *hdr = (struct p54_hdr *) skb->data;
 530
 531         switch (le16_to_cpu(hdr->type)) {
 532         case P54_CONTROL_TYPE_TXDONE:
 533                 p54_rx_frame_sent(priv, skb);
 534                 break;
 535         case P54_CONTROL_TYPE_TRAP:
 536                 p54_rx_trap(priv, skb);
 537                 break;
 538         case P54_CONTROL_TYPE_BBP:
 539                 break;
 540         case P54_CONTROL_TYPE_STAT_READBACK:
 541                 p54_rx_stats(priv, skb);
 542                 break;
 543         case P54_CONTROL_TYPE_EEPROM_READBACK:
 544                 p54_rx_eeprom_readback(priv, skb);
 545                 break;
 546         default:
 547                 printk(KERN_DEBUG "%s: not handling 0x%02x type control frame\n",
 548                        wiphy_name(priv->hw->wiphy), le16_to_cpu(hdr->type));
 549                 break;
 550         }
 551         return 0;
 552 }
 553
 554 /* returns zero if skb can be reused */
 555 int p54_rx(struct ieee80211_hw *dev, struct sk_buff *skb)
 556 {
 557         struct p54_common *priv = dev->priv;
 558         u16 type = le16_to_cpu(*((__le16 *)skb->data));
 559
 560         if (type & P54_HDR_FLAG_CONTROL)
 561                 return p54_rx_control(priv, skb);
 562         else
 563                 return p54_rx_data(priv, skb);
 564 }
 565 EXPORT_SYMBOL_GPL(p54_rx);
 566
 567 static void p54_tx_80211_header(struct p54_common *priv, struct sk_buff *skb,
 568                                 struct ieee80211_tx_info *info, u8 *queue,
 569                                 u32 *extra_len, u16 *flags, u16 *aid,
 570                                 bool *burst_possible)
 571 {
 572         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 573
 574         if (ieee80211_is_data_qos(hdr->frame_control))
 575                 *burst_possible = true;
 576         else
 577                 *burst_possible = false;
 578
 579         if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ)
 580                 *flags |= P54_HDR_FLAG_DATA_OUT_SEQNR;
 581
 582         if (info->flags & IEEE80211_TX_CTL_CLEAR_PS_FILT)
 583                 *flags |= P54_HDR_FLAG_DATA_OUT_NOCANCEL;
 584
 585         *queue = skb_get_queue_mapping(skb) + P54_QUEUE_DATA;
 586
 587         switch (priv->mode) {
 588         case NL80211_IFTYPE_MONITOR:
 589                 /*
 590                  * We have to set P54_HDR_FLAG_DATA_OUT_PROMISC for
 591                  * every frame in promiscuous/monitor mode.
 592                  * see STSW45x0C LMAC API - page 12.
 593                  */
 594                 *aid = 0;
 595                 *flags |= P54_HDR_FLAG_DATA_OUT_PROMISC;
 596                 break;
 597         case NL80211_IFTYPE_STATION:
 598                 *aid = 1;
 599                 break;
 600         case NL80211_IFTYPE_AP:
 601         case NL80211_IFTYPE_ADHOC:
 602         case NL80211_IFTYPE_MESH_POINT:
 603                 if (info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) {
 604                         *aid = 0;
 605                         *queue = P54_QUEUE_CAB;
 606                         return;
 607                 }
 608
 609                 if (unlikely(ieee80211_is_mgmt(hdr->frame_control))) {
 610                         if (ieee80211_is_probe_resp(hdr->frame_control)) {
 611                                 *aid = 0;
 612                                 *flags |= P54_HDR_FLAG_DATA_OUT_TIMESTAMP |
 613                                           P54_HDR_FLAG_DATA_OUT_NOCANCEL;
 614                                 return;
 615                         } else if (ieee80211_is_beacon(hdr->frame_control)) {
 616                                 *aid = 0;
 617
 618                                 if (info->flags & IEEE80211_TX_CTL_INJECTED) {
 619                                         /*
 620                                          * Injecting beacons on top of a AP is
 621                                          * not a good idea... nevertheless,
 622                                          * it should be doable.
 623                                          */
 624
 625                                         return;
 626                                 }
 627
 628                                 *flags |= P54_HDR_FLAG_DATA_OUT_TIMESTAMP;
 629                                 *queue = P54_QUEUE_BEACON;
 630                                 *extra_len = IEEE80211_MAX_TIM_LEN;
 631                                 return;
 632                         }
 633                 }
 634
 635                 if (info->control.sta)
 636                         *aid = info->control.sta->aid;
 637                 break;
 638         }
 639 }
 640
 641 static u8 p54_convert_algo(enum ieee80211_key_alg alg)
 642 {
 643         switch (alg) {
 644         case ALG_WEP:
 645                 return P54_CRYPTO_WEP;
 646         case ALG_TKIP:
 647                 return P54_CRYPTO_TKIPMICHAEL;
 648         case ALG_CCMP:
 649                 return P54_CRYPTO_AESCCMP;
 650         default:
 651                 return 0;
 652         }
 653 }
 654
 655 int p54_tx_80211(struct ieee80211_hw *dev, struct sk_buff *skb)
 656 {
 657         struct p54_common *priv = dev->priv;
 658         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 659         struct p54_tx_info *p54info;
 660         struct p54_hdr *hdr;
 661         struct p54_tx_data *txhdr;
 662         unsigned int padding, len, extra_len;
 663         int i, j, ridx;
 664         u16 hdr_flags = 0, aid = 0;
 665         u8 rate, queue = 0, crypt_offset = 0;
 666         u8 cts_rate = 0x20;
 667         u8 rc_flags;
 668         u8 calculated_tries[4];
 669         u8 nrates = 0, nremaining = 8;
 670         bool burst_allowed = false;
 671
 672         p54_tx_80211_header(priv, skb, info, &queue, &extra_len,
 673                             &hdr_flags, &aid, &burst_allowed);
 674
 675         if (p54_tx_qos_accounting_alloc(priv, skb, queue)) {
 676                 if (!IS_QOS_QUEUE(queue)) {
 677                         dev_kfree_skb_any(skb);
 678                         return NETDEV_TX_OK;
 679                 } else {
 680                         return NETDEV_TX_BUSY;
 681                 }
 682         }
 683
 684         padding = (unsigned long)(skb->data - (sizeof(*hdr) + sizeof(*txhdr))) & 3;
 685         len = skb->len;
 686
 687         if (info->control.hw_key) {
 688                 crypt_offset = ieee80211_get_hdrlen_from_skb(skb);
 689                 if (info->control.hw_key->alg == ALG_TKIP) {
 690                         u8 *iv = (u8 *)(skb->data + crypt_offset);
 691                         /*
 692                          * The firmware excepts that the IV has to have
 693                          * this special format
 694                          */
 695                         iv[1] = iv[0];
 696                         iv[0] = iv[2];
 697                         iv[2] = 0;
 698                 }
 699         }
 700
 701         txhdr = (struct p54_tx_data *) skb_push(skb, sizeof(*txhdr) + padding);
 702         hdr = (struct p54_hdr *) skb_push(skb, sizeof(*hdr));
 703
 704         if (padding)
 705                 hdr_flags |= P54_HDR_FLAG_DATA_ALIGN;
 706         hdr->type = cpu_to_le16(aid);
 707         hdr->rts_tries = info->control.rates[0].count;
 708
 709         /*
 710          * we register the rates in perfect order, and
 711          * RTS/CTS won't happen on 5 GHz
 712          */
 713         cts_rate = info->control.rts_cts_rate_idx;
 714
 715         memset(&txhdr->rateset, 0, sizeof(txhdr->rateset));
 716
 717         /* see how many rates got used */
 718         for (i = 0; i < dev->max_rates; i++) {
 719                 if (info->control.rates[i].idx < 0)
 720                         break;
 721                 nrates++;
 722         }
 723
 724         /* limit tries to 8/nrates per rate */
 725         for (i = 0; i < nrates; i++) {
 726                 /*
 727                  * The magic expression here is equivalent to 8/nrates for
 728                  * all values that matter, but avoids division and jumps.
 729                  * Note that nrates can only take the values 1 through 4.
 730                  */
 731                 calculated_tries[i] = min_t(int, ((15 >> nrates) | 1) + 1,
 732                                                  info->control.rates[i].count);
 733                 nremaining -= calculated_tries[i];
 734         }
 735
 736         /* if there are tries left, distribute from back to front */
 737         for (i = nrates - 1; nremaining > 0 && i >= 0; i--) {
 738                 int tmp = info->control.rates[i].count - calculated_tries[i];
 739
 740                 if (tmp <= 0)
 741                         continue;
 742                 /* RC requested more tries at this rate */
 743
 744                 tmp = min_t(int, tmp, nremaining);
 745                 calculated_tries[i] += tmp;
 746                 nremaining -= tmp;
 747         }
 748
 749         ridx = 0;
 750         for (i = 0; i < nrates && ridx < 8; i++) {
 751                 /* we register the rates in perfect order */
 752                 rate = info->control.rates[i].idx;
 753                 if (info->band == IEEE80211_BAND_5GHZ)
 754                         rate += 4;
 755
 756                 /* store the count we actually calculated for TX status */
 757                 info->control.rates[i].count = calculated_tries[i];
 758
 759                 rc_flags = info->control.rates[i].flags;
 760                 if (rc_flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE) {
 761                         rate |= 0x10;
 762                         cts_rate |= 0x10;
 763                 }
 764                 if (rc_flags & IEEE80211_TX_RC_USE_RTS_CTS) {
 765                         burst_allowed = false;
 766                         rate |= 0x40;
 767                 } else if (rc_flags & IEEE80211_TX_RC_USE_CTS_PROTECT) {
 768                         rate |= 0x20;
 769                         burst_allowed = false;
 770                 }
 771                 for (j = 0; j < calculated_tries[i] && ridx < 8; j++) {
 772                         txhdr->rateset[ridx] = rate;
 773                         ridx++;
 774                 }
 775         }
 776
 777         if (burst_allowed)
 778                 hdr_flags |= P54_HDR_FLAG_DATA_OUT_BURST;
 779
 780         /* TODO: enable bursting */
 781         hdr->flags = cpu_to_le16(hdr_flags);
 782         hdr->tries = ridx;
 783         txhdr->rts_rate_idx = 0;
 784         if (info->control.hw_key) {
 785                 txhdr->key_type = p54_convert_algo(info->control.hw_key->alg);
 786                 txhdr->key_len = min((u8)16, info->control.hw_key->keylen);
 787                 memcpy(txhdr->key, info->control.hw_key->key, txhdr->key_len);
 788                 if (info->control.hw_key->alg == ALG_TKIP) {
 789                         /* reserve space for the MIC key */
 790                         len += 8;
 791                         memcpy(skb_put(skb, 8), &(info->control.hw_key->key
 792                                 [NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY]), 8);
 793                 }
 794                 /* reserve some space for ICV */
 795                 len += info->control.hw_key->icv_len;
 796                 memset(skb_put(skb, info->control.hw_key->icv_len), 0,
 797                        info->control.hw_key->icv_len);
 798         } else {
 799                 txhdr->key_type = 0;
 800                 txhdr->key_len = 0;
 801         }
 802         txhdr->crypt_offset = crypt_offset;
 803         txhdr->hw_queue = queue;
 804         txhdr->backlog = priv->tx_stats[queue].len - 1;
 805         memset(txhdr->durations, 0, sizeof(txhdr->durations));
 806         txhdr->tx_antenna = ((info->antenna_sel_tx == 0) ?
 807                 2 : info->antenna_sel_tx - 1) & priv->tx_diversity_mask;
 808         if (priv->rxhw == 5) {
 809                 txhdr->longbow.cts_rate = cts_rate;
 810                 txhdr->longbow.output_power = cpu_to_le16(priv->output_power);
 811         } else {
 812                 txhdr->normal.output_power = priv->output_power;
 813                 txhdr->normal.cts_rate = cts_rate;
 814         }
 815         if (padding)
 816                 txhdr->align[0] = padding;
 817
 818         hdr->len = cpu_to_le16(len);
 819         /* modifies skb->cb and with it info, so must be last! */
 820         p54info = (void *) info->rate_driver_data;
 821         p54info->extra_len = extra_len;
 822
 823         p54_tx(priv, skb);
 824         return NETDEV_TX_OK;
 825 }