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         info = IEEE80211_SKB_CB(skb);
  91         range = (void *) info->rate_driver_data;
  92         len = (range->extra_len + len) & ~0x3;
  93
  94         spin_lock_irqsave(&priv->tx_queue.lock, flags);
  95         if (unlikely(skb_queue_len(&priv->tx_queue) == 32)) {
  96                 /*
  97                  * The tx_queue is now really full.
  98                  *
  99                  * TODO: check if the device has crashed and reset it.
 100                  */
 101                 spin_unlock_irqrestore(&priv->tx_queue.lock, flags);
 102                 return -EBUSY;
 103         }
 104
 105         skb_queue_walk(&priv->tx_queue, entry) {
 106                 u32 hole_size;
 107                 info = IEEE80211_SKB_CB(entry);
 108                 range = (void *) info->rate_driver_data;
 109                 hole_size = range->start_addr - last_addr;
 110
 111                 if (!target_skb && hole_size >= len) {
 112                         target_skb = entry->prev;
 113                         hole_size -= len;
 114                         target_addr = last_addr;
 115                         break;
 116                 }
 117                 last_addr = range->end_addr;
 118         }
 119         if (unlikely(!target_skb)) {
 120                 if (priv->rx_end - last_addr >= len) {
 121                         target_skb = priv->tx_queue.prev;
 122                         if (!skb_queue_empty(&priv->tx_queue)) {
 123                                 info = IEEE80211_SKB_CB(target_skb);
 124                                 range = (void *)info->rate_driver_data;
 125                                 target_addr = range->end_addr;
 126                         }
 127                 } else {
 128                         spin_unlock_irqrestore(&priv->tx_queue.lock, flags);
 129                         return -ENOSPC;
 130                 }
 131         }
 132
 133         info = IEEE80211_SKB_CB(skb);
 134         range = (void *) info->rate_driver_data;
 135         range->start_addr = target_addr;
 136         range->end_addr = target_addr + len;
 137         data->req_id = cpu_to_le32(target_addr + priv->headroom);
 138         if (IS_DATA_FRAME(skb) &&
 139             unlikely(GET_HW_QUEUE(skb) == P54_QUEUE_BEACON))
 140                 priv->beacon_req_id = data->req_id;
 141
 142         __skb_queue_after(&priv->tx_queue, target_skb, skb);
 143         spin_unlock_irqrestore(&priv->tx_queue.lock, flags);
 144         return 0;
 145 }
 146
 147 static void p54_tx_pending(struct p54_common *priv)
 148 {
 149         struct sk_buff *skb;
 150         int ret;
 151
 152         skb = skb_dequeue(&priv->tx_pending);
 153         if (unlikely(!skb))
 154                 return ;
 155
 156         ret = p54_assign_address(priv, skb);
 157         if (unlikely(ret))
 158                 skb_queue_head(&priv->tx_pending, skb);
 159         else
 160                 priv->tx(priv->hw, skb);
 161 }
 162
 163 static void p54_wake_queues(struct p54_common *priv)
 164 {
 165         unsigned long flags;
 166         unsigned int i;
 167
 168         if (unlikely(priv->mode == NL80211_IFTYPE_UNSPECIFIED))
 169                 return ;
 170
 171         p54_tx_pending(priv);
 172
 173         spin_lock_irqsave(&priv->tx_stats_lock, flags);
 174         for (i = 0; i < priv->hw->queues; i++) {
 175                 if (priv->tx_stats[i + P54_QUEUE_DATA].len <
 176                     priv->tx_stats[i + P54_QUEUE_DATA].limit)
 177                         ieee80211_wake_queue(priv->hw, i);
 178         }
 179         spin_unlock_irqrestore(&priv->tx_stats_lock, flags);
 180 }
 181
 182 static int p54_tx_qos_accounting_alloc(struct p54_common *priv,
 183                                        struct sk_buff *skb,
 184                                        const u16 p54_queue)
 185 {
 186         struct ieee80211_tx_queue_stats *queue;
 187         unsigned long flags;
 188
 189         if (WARN_ON(p54_queue > P54_QUEUE_NUM))
 190                 return -EINVAL;
 191
 192         queue = &priv->tx_stats[p54_queue];
 193
 194         spin_lock_irqsave(&priv->tx_stats_lock, flags);
 195         if (unlikely(queue->len >= queue->limit && IS_QOS_QUEUE(p54_queue))) {
 196                 spin_unlock_irqrestore(&priv->tx_stats_lock, flags);
 197                 return -ENOSPC;
 198         }
 199
 200         queue->len++;
 201         queue->count++;
 202
 203         if (unlikely(queue->len == queue->limit && IS_QOS_QUEUE(p54_queue))) {
 204                 u16 ac_queue = p54_queue - P54_QUEUE_DATA;
 205                 ieee80211_stop_queue(priv->hw, ac_queue);
 206         }
 207
 208         spin_unlock_irqrestore(&priv->tx_stats_lock, flags);
 209         return 0;
 210 }
 211
 212 static void p54_tx_qos_accounting_free(struct p54_common *priv,
 213                                        struct sk_buff *skb)
 214 {
 215         if (IS_DATA_FRAME(skb)) {
 216                 unsigned long flags;
 217
 218                 spin_lock_irqsave(&priv->tx_stats_lock, flags);
 219                 priv->tx_stats[GET_HW_QUEUE(skb)].len--;
 220                 spin_unlock_irqrestore(&priv->tx_stats_lock, flags);
 221
 222                 if (unlikely(GET_HW_QUEUE(skb) == P54_QUEUE_BEACON)) {
 223                         if (priv->beacon_req_id == GET_REQ_ID(skb)) {
 224                                 /* this is the  active beacon set anymore */
 225                                 priv->beacon_req_id = 0;
 226                         }
 227                         complete(&priv->beacon_comp);
 228                 }
 229         }
 230         p54_wake_queues(priv);
 231 }
 232
 233 void p54_free_skb(struct ieee80211_hw *dev, struct sk_buff *skb)
 234 {
 235         struct p54_common *priv = dev->priv;
 236         if (unlikely(!skb))
 237                 return ;
 238
 239         skb_unlink(skb, &priv->tx_queue);
 240         p54_tx_qos_accounting_free(priv, skb);
 241         dev_kfree_skb_any(skb);
 242 }
 243 EXPORT_SYMBOL_GPL(p54_free_skb);
 244
 245 static struct sk_buff *p54_find_and_unlink_skb(struct p54_common *priv,
 246                                                const __le32 req_id)
 247 {
 248         struct sk_buff *entry;
 249         unsigned long flags;
 250
 251         spin_lock_irqsave(&priv->tx_queue.lock, flags);
 252         skb_queue_walk(&priv->tx_queue, entry) {
 253                 struct p54_hdr *hdr = (struct p54_hdr *) entry->data;
 254
 255                 if (hdr->req_id == req_id) {
 256                         __skb_unlink(entry, &priv->tx_queue);
 257                         spin_unlock_irqrestore(&priv->tx_queue.lock, flags);
 258                         p54_tx_qos_accounting_free(priv, entry);
 259                         return entry;
 260                 }
 261         }
 262         spin_unlock_irqrestore(&priv->tx_queue.lock, flags);
 263         return NULL;
 264 }
 265
 266 void p54_tx(struct p54_common *priv, struct sk_buff *skb)
 267 {
 268         skb_queue_tail(&priv->tx_pending, skb);
 269         p54_tx_pending(priv);
 270 }
 271
 272 static int p54_rssi_to_dbm(struct p54_common *priv, int rssi)
 273 {
 274         int band = priv->hw->conf.channel->band;
 275
 276         if (priv->rxhw != 5)
 277                 return ((rssi * priv->rssical_db[band].mul) / 64 +
 278                          priv->rssical_db[band].add) / 4;
 279         else
 280                 /*
 281                  * TODO: find the correct formula
 282                  */
 283                 return ((rssi * priv->rssical_db[band].mul) / 64 +
 284                          priv->rssical_db[band].add) / 4;
 285 }
 286
 287 /*
 288  * Even if the firmware is capable of dealing with incoming traffic,
 289  * while dozing, we have to prepared in case mac80211 uses PS-POLL
 290  * to retrieve outstanding frames from our AP.
 291  * (see comment in net/mac80211/mlme.c @ line 1993)
 292  */
 293 static void p54_pspoll_workaround(struct p54_common *priv, struct sk_buff *skb)
 294 {
 295         struct ieee80211_hdr *hdr = (void *) skb->data;
 296         struct ieee80211_tim_ie *tim_ie;
 297         u8 *tim;
 298         u8 tim_len;
 299         bool new_psm;
 300
 301         /* only beacons have a TIM IE */
 302         if (!ieee80211_is_beacon(hdr->frame_control))
 303                 return;
 304
 305         if (!priv->aid)
 306                 return;
 307
 308         /* only consider beacons from the associated BSSID */
 309         if (compare_ether_addr(hdr->addr3, priv->bssid))
 310                 return;
 311
 312         tim = p54_find_ie(skb, WLAN_EID_TIM);
 313         if (!tim)
 314                 return;
 315
 316         tim_len = tim[1];
 317         tim_ie = (struct ieee80211_tim_ie *) &tim[2];
 318
 319         new_psm = ieee80211_check_tim(tim_ie, tim_len, priv->aid);
 320         if (new_psm != priv->powersave_override) {
 321                 priv->powersave_override = new_psm;
 322                 p54_set_ps(priv);
 323         }
 324 }
 325
 326 static int p54_rx_data(struct p54_common *priv, struct sk_buff *skb)
 327 {
 328         struct p54_rx_data *hdr = (struct p54_rx_data *) skb->data;
 329         struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
 330         u16 freq = le16_to_cpu(hdr->freq);
 331         size_t header_len = sizeof(*hdr);
 332         u32 tsf32;
 333         u8 rate = hdr->rate & 0xf;
 334
 335         /*
 336          * If the device is in a unspecified state we have to
 337          * ignore all data frames. Else we could end up with a
 338          * nasty crash.
 339          */
 340         if (unlikely(priv->mode == NL80211_IFTYPE_UNSPECIFIED))
 341                 return 0;
 342
 343         if (!(hdr->flags & cpu_to_le16(P54_HDR_FLAG_DATA_IN_FCS_GOOD)))
 344                 return 0;
 345
 346         if (hdr->decrypt_status == P54_DECRYPT_OK)
 347                 rx_status->flag |= RX_FLAG_DECRYPTED;
 348         if ((hdr->decrypt_status == P54_DECRYPT_FAIL_MICHAEL) ||
 349             (hdr->decrypt_status == P54_DECRYPT_FAIL_TKIP))
 350                 rx_status->flag |= RX_FLAG_MMIC_ERROR;
 351
 352         rx_status->signal = p54_rssi_to_dbm(priv, hdr->rssi);
 353         rx_status->noise = priv->noise;
 354         if (hdr->rate & 0x10)
 355                 rx_status->flag |= RX_FLAG_SHORTPRE;
 356         if (priv->hw->conf.channel->band == IEEE80211_BAND_5GHZ)
 357                 rx_status->rate_idx = (rate < 4) ? 0 : rate - 4;
 358         else
 359                 rx_status->rate_idx = rate;
 360
 361         rx_status->freq = freq;
 362         rx_status->band =  priv->hw->conf.channel->band;
 363         rx_status->antenna = hdr->antenna;
 364
 365         tsf32 = le32_to_cpu(hdr->tsf32);
 366         if (tsf32 < priv->tsf_low32)
 367                 priv->tsf_high32++;
 368         rx_status->mactime = ((u64)priv->tsf_high32) << 32 | tsf32;
 369         priv->tsf_low32 = tsf32;
 370
 371         rx_status->flag |= RX_FLAG_TSFT;
 372
 373         if (hdr->flags & cpu_to_le16(P54_HDR_FLAG_DATA_ALIGN))
 374                 header_len += hdr->align[0];
 375
 376         skb_pull(skb, header_len);
 377         skb_trim(skb, le16_to_cpu(hdr->len));
 378         if (unlikely(priv->hw->conf.flags & IEEE80211_CONF_PS))
 379                 p54_pspoll_workaround(priv, skb);
 380
 381         ieee80211_rx_irqsafe(priv->hw, skb);
 382
 383         ieee80211_queue_delayed_work(priv->hw, &priv->work,
 384                            msecs_to_jiffies(P54_STATISTICS_UPDATE));
 385
 386         return -1;
 387 }
 388
 389 static void p54_rx_frame_sent(struct p54_common *priv, struct sk_buff *skb)
 390 {
 391         struct p54_hdr *hdr = (struct p54_hdr *) skb->data;
 392         struct p54_frame_sent *payload = (struct p54_frame_sent *) hdr->data;
 393         struct ieee80211_tx_info *info;
 394         struct p54_hdr *entry_hdr;
 395         struct p54_tx_data *entry_data;
 396         struct sk_buff *entry;
 397         unsigned int pad = 0, frame_len;
 398         int count, idx;
 399
 400         entry = p54_find_and_unlink_skb(priv, hdr->req_id);
 401         if (unlikely(!entry))
 402                 return ;
 403
 404         frame_len = entry->len;
 405         info = IEEE80211_SKB_CB(entry);
 406         entry_hdr = (struct p54_hdr *) entry->data;
 407         entry_data = (struct p54_tx_data *) entry_hdr->data;
 408         priv->stats.dot11ACKFailureCount += payload->tries - 1;
 409
 410         /*
 411          * Frames in P54_QUEUE_FWSCAN and P54_QUEUE_BEACON are
 412          * generated by the driver. Therefore tx_status is bogus
 413          * and we don't want to confuse the mac80211 stack.
 414          */
 415         if (unlikely(entry_data->hw_queue < P54_QUEUE_FWSCAN)) {
 416                 dev_kfree_skb_any(entry);
 417                 return ;
 418         }
 419
 420         /*
 421          * Clear manually, ieee80211_tx_info_clear_status would
 422          * clear the counts too and we need them.
 423          */
 424         memset(&info->status.ampdu_ack_len, 0,
 425                sizeof(struct ieee80211_tx_info) -
 426                offsetof(struct ieee80211_tx_info, status.ampdu_ack_len));
 427         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info,
 428                               status.ampdu_ack_len) != 23);
 429
 430         if (entry_hdr->flags & cpu_to_le16(P54_HDR_FLAG_DATA_ALIGN))
 431                 pad = entry_data->align[0];
 432
 433         /* walk through the rates array and adjust the counts */
 434         count = payload->tries;
 435         for (idx = 0; idx < 4; idx++) {
 436                 if (count >= info->status.rates[idx].count) {
 437                         count -= info->status.rates[idx].count;
 438                 } else if (count > 0) {
 439                         info->status.rates[idx].count = count;
 440                         count = 0;
 441                 } else {
 442                         info->status.rates[idx].idx = -1;
 443                         info->status.rates[idx].count = 0;
 444                 }
 445         }
 446
 447         if (!(info->flags & IEEE80211_TX_CTL_NO_ACK) &&
 448              (!payload->status))
 449                 info->flags |= IEEE80211_TX_STAT_ACK;
 450         if (payload->status & P54_TX_PSM_CANCELLED)
 451                 info->flags |= IEEE80211_TX_STAT_TX_FILTERED;
 452         info->status.ack_signal = p54_rssi_to_dbm(priv,
 453                                                   (int)payload->ack_rssi);
 454
 455         /* Undo all changes to the frame. */
 456         switch (entry_data->key_type) {
 457         case P54_CRYPTO_TKIPMICHAEL: {
 458                 u8 *iv = (u8 *)(entry_data->align + pad +
 459                                 entry_data->crypt_offset);
 460
 461                 /* Restore the original TKIP IV. */
 462                 iv[2] = iv[0];
 463                 iv[0] = iv[1];
 464                 iv[1] = (iv[0] | 0x20) & 0x7f;  /* WEPSeed - 8.3.2.2 */
 465
 466                 frame_len -= 12; /* remove TKIP_MMIC + TKIP_ICV */
 467                 break;
 468                 }
 469         case P54_CRYPTO_AESCCMP:
 470                 frame_len -= 8; /* remove CCMP_MIC */
 471                 break;
 472         case P54_CRYPTO_WEP:
 473                 frame_len -= 4; /* remove WEP_ICV */
 474                 break;
 475         }
 476
 477         skb_trim(entry, frame_len);
 478         skb_pull(entry, sizeof(*hdr) + pad + sizeof(*entry_data));
 479         ieee80211_tx_status_irqsafe(priv->hw, entry);
 480 }
 481
 482 static void p54_rx_eeprom_readback(struct p54_common *priv,
 483                                    struct sk_buff *skb)
 484 {
 485         struct p54_hdr *hdr = (struct p54_hdr *) skb->data;
 486         struct p54_eeprom_lm86 *eeprom = (struct p54_eeprom_lm86 *) hdr->data;
 487         struct sk_buff *tmp;
 488
 489         if (!priv->eeprom)
 490                 return ;
 491
 492         if (priv->fw_var >= 0x509) {
 493                 memcpy(priv->eeprom, eeprom->v2.data,
 494                        le16_to_cpu(eeprom->v2.len));
 495         } else {
 496                 memcpy(priv->eeprom, eeprom->v1.data,
 497                        le16_to_cpu(eeprom->v1.len));
 498         }
 499
 500         priv->eeprom = NULL;
 501         tmp = p54_find_and_unlink_skb(priv, hdr->req_id);
 502         dev_kfree_skb_any(tmp);
 503         complete(&priv->eeprom_comp);
 504 }
 505
 506 static void p54_rx_stats(struct p54_common *priv, struct sk_buff *skb)
 507 {
 508         struct p54_hdr *hdr = (struct p54_hdr *) skb->data;
 509         struct p54_statistics *stats = (struct p54_statistics *) hdr->data;
 510         struct sk_buff *tmp;
 511         u32 tsf32;
 512
 513         if (unlikely(priv->mode == NL80211_IFTYPE_UNSPECIFIED))
 514                 return ;
 515
 516         tsf32 = le32_to_cpu(stats->tsf32);
 517         if (tsf32 < priv->tsf_low32)
 518                 priv->tsf_high32++;
 519         priv->tsf_low32 = tsf32;
 520
 521         priv->stats.dot11RTSFailureCount = le32_to_cpu(stats->rts_fail);
 522         priv->stats.dot11RTSSuccessCount = le32_to_cpu(stats->rts_success);
 523         priv->stats.dot11FCSErrorCount = le32_to_cpu(stats->rx_bad_fcs);
 524
 525         priv->noise = p54_rssi_to_dbm(priv, le32_to_cpu(stats->noise));
 526
 527         tmp = p54_find_and_unlink_skb(priv, hdr->req_id);
 528         dev_kfree_skb_any(tmp);
 529 }
 530
 531 static void p54_rx_trap(struct p54_common *priv, struct sk_buff *skb)
 532 {
 533         struct p54_hdr *hdr = (struct p54_hdr *) skb->data;
 534         struct p54_trap *trap = (struct p54_trap *) hdr->data;
 535         u16 event = le16_to_cpu(trap->event);
 536         u16 freq = le16_to_cpu(trap->frequency);
 537
 538         switch (event) {
 539         case P54_TRAP_BEACON_TX:
 540                 break;
 541         case P54_TRAP_RADAR:
 542                 printk(KERN_INFO "%s: radar (freq:%d MHz)\n",
 543                         wiphy_name(priv->hw->wiphy), freq);
 544                 break;
 545         case P54_TRAP_NO_BEACON:
 546                 if (priv->vif)
 547                         ieee80211_beacon_loss(priv->vif);
 548                 break;
 549         case P54_TRAP_SCAN:
 550                 break;
 551         case P54_TRAP_TBTT:
 552                 break;
 553         case P54_TRAP_TIMER:
 554                 break;
 555         case P54_TRAP_FAA_RADIO_OFF:
 556                 wiphy_rfkill_set_hw_state(priv->hw->wiphy, true);
 557                 break;
 558         case P54_TRAP_FAA_RADIO_ON:
 559                 wiphy_rfkill_set_hw_state(priv->hw->wiphy, false);
 560                 break;
 561         default:
 562                 printk(KERN_INFO "%s: received event:%x freq:%d\n",
 563                        wiphy_name(priv->hw->wiphy), event, freq);
 564                 break;
 565         }
 566 }
 567
 568 static int p54_rx_control(struct p54_common *priv, struct sk_buff *skb)
 569 {
 570         struct p54_hdr *hdr = (struct p54_hdr *) skb->data;
 571
 572         switch (le16_to_cpu(hdr->type)) {
 573         case P54_CONTROL_TYPE_TXDONE:
 574                 p54_rx_frame_sent(priv, skb);
 575                 break;
 576         case P54_CONTROL_TYPE_TRAP:
 577                 p54_rx_trap(priv, skb);
 578                 break;
 579         case P54_CONTROL_TYPE_BBP:
 580                 break;
 581         case P54_CONTROL_TYPE_STAT_READBACK:
 582                 p54_rx_stats(priv, skb);
 583                 break;
 584         case P54_CONTROL_TYPE_EEPROM_READBACK:
 585                 p54_rx_eeprom_readback(priv, skb);
 586                 break;
 587         default:
 588                 printk(KERN_DEBUG "%s: not handling 0x%02x type control frame\n",
 589                        wiphy_name(priv->hw->wiphy), le16_to_cpu(hdr->type));
 590                 break;
 591         }
 592         return 0;
 593 }
 594
 595 /* returns zero if skb can be reused */
 596 int p54_rx(struct ieee80211_hw *dev, struct sk_buff *skb)
 597 {
 598         struct p54_common *priv = dev->priv;
 599         u16 type = le16_to_cpu(*((__le16 *)skb->data));
 600
 601         if (type & P54_HDR_FLAG_CONTROL)
 602                 return p54_rx_control(priv, skb);
 603         else
 604                 return p54_rx_data(priv, skb);
 605 }
 606 EXPORT_SYMBOL_GPL(p54_rx);
 607
 608 static void p54_tx_80211_header(struct p54_common *priv, struct sk_buff *skb,
 609                                 struct ieee80211_tx_info *info, u8 *queue,
 610                                 u32 *extra_len, u16 *flags, u16 *aid,
 611                                 bool *burst_possible)
 612 {
 613         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 614
 615         if (ieee80211_is_data_qos(hdr->frame_control))
 616                 *burst_possible = true;
 617         else
 618                 *burst_possible = false;
 619
 620         if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ)
 621                 *flags |= P54_HDR_FLAG_DATA_OUT_SEQNR;
 622
 623         if (info->flags & IEEE80211_TX_CTL_PSPOLL_RESPONSE)
 624                 *flags |= P54_HDR_FLAG_DATA_OUT_NOCANCEL;
 625
 626         *queue = skb_get_queue_mapping(skb) + P54_QUEUE_DATA;
 627
 628         switch (priv->mode) {
 629         case NL80211_IFTYPE_MONITOR:
 630                 /*
 631                  * We have to set P54_HDR_FLAG_DATA_OUT_PROMISC for
 632                  * every frame in promiscuous/monitor mode.
 633                  * see STSW45x0C LMAC API - page 12.
 634                  */
 635                 *aid = 0;
 636                 *flags |= P54_HDR_FLAG_DATA_OUT_PROMISC;
 637                 break;
 638         case NL80211_IFTYPE_STATION:
 639                 *aid = 1;
 640                 break;
 641         case NL80211_IFTYPE_AP:
 642         case NL80211_IFTYPE_ADHOC:
 643         case NL80211_IFTYPE_MESH_POINT:
 644                 if (info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) {
 645                         *aid = 0;
 646                         *queue = P54_QUEUE_CAB;
 647                         return;
 648                 }
 649
 650                 if (unlikely(ieee80211_is_mgmt(hdr->frame_control))) {
 651                         if (ieee80211_is_probe_resp(hdr->frame_control)) {
 652                                 *aid = 0;
 653                                 *flags |= P54_HDR_FLAG_DATA_OUT_TIMESTAMP |
 654                                           P54_HDR_FLAG_DATA_OUT_NOCANCEL;
 655                                 return;
 656                         } else if (ieee80211_is_beacon(hdr->frame_control)) {
 657                                 *aid = 0;
 658
 659                                 if (info->flags & IEEE80211_TX_CTL_INJECTED) {
 660                                         /*
 661                                          * Injecting beacons on top of a AP is
 662                                          * not a good idea... nevertheless,
 663                                          * it should be doable.
 664                                          */
 665
 666                                         return;
 667                                 }
 668
 669                                 *flags |= P54_HDR_FLAG_DATA_OUT_TIMESTAMP;
 670                                 *queue = P54_QUEUE_BEACON;
 671                                 *extra_len = IEEE80211_MAX_TIM_LEN;
 672                                 return;
 673                         }
 674                 }
 675
 676                 if (info->control.sta)
 677                         *aid = info->control.sta->aid;
 678                 break;
 679         }
 680 }
 681
 682 static u8 p54_convert_algo(enum ieee80211_key_alg alg)
 683 {
 684         switch (alg) {
 685         case ALG_WEP:
 686                 return P54_CRYPTO_WEP;
 687         case ALG_TKIP:
 688                 return P54_CRYPTO_TKIPMICHAEL;
 689         case ALG_CCMP:
 690                 return P54_CRYPTO_AESCCMP;
 691         default:
 692                 return 0;
 693         }
 694 }
 695
 696 int p54_tx_80211(struct ieee80211_hw *dev, struct sk_buff *skb)
 697 {
 698         struct p54_common *priv = dev->priv;
 699         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 700         struct p54_tx_info *p54info;
 701         struct p54_hdr *hdr;
 702         struct p54_tx_data *txhdr;
 703         unsigned int padding, len, extra_len;
 704         int i, j, ridx;
 705         u16 hdr_flags = 0, aid = 0;
 706         u8 rate, queue = 0, crypt_offset = 0;
 707         u8 cts_rate = 0x20;
 708         u8 rc_flags;
 709         u8 calculated_tries[4];
 710         u8 nrates = 0, nremaining = 8;
 711         bool burst_allowed = false;
 712
 713         p54_tx_80211_header(priv, skb, info, &queue, &extra_len,
 714                             &hdr_flags, &aid, &burst_allowed);
 715
 716         if (p54_tx_qos_accounting_alloc(priv, skb, queue)) {
 717                 if (!IS_QOS_QUEUE(queue)) {
 718                         dev_kfree_skb_any(skb);
 719                         return NETDEV_TX_OK;
 720                 } else {
 721                         return NETDEV_TX_BUSY;
 722                 }
 723         }
 724
 725         padding = (unsigned long)(skb->data - (sizeof(*hdr) + sizeof(*txhdr))) & 3;
 726         len = skb->len;
 727
 728         if (info->control.hw_key) {
 729                 crypt_offset = ieee80211_get_hdrlen_from_skb(skb);
 730                 if (info->control.hw_key->alg == ALG_TKIP) {
 731                         u8 *iv = (u8 *)(skb->data + crypt_offset);
 732                         /*
 733                          * The firmware excepts that the IV has to have
 734                          * this special format
 735                          */
 736                         iv[1] = iv[0];
 737                         iv[0] = iv[2];
 738                         iv[2] = 0;
 739                 }
 740         }
 741
 742         txhdr = (struct p54_tx_data *) skb_push(skb, sizeof(*txhdr) + padding);
 743         hdr = (struct p54_hdr *) skb_push(skb, sizeof(*hdr));
 744
 745         if (padding)
 746                 hdr_flags |= P54_HDR_FLAG_DATA_ALIGN;
 747         hdr->type = cpu_to_le16(aid);
 748         hdr->rts_tries = info->control.rates[0].count;
 749
 750         /*
 751          * we register the rates in perfect order, and
 752          * RTS/CTS won't happen on 5 GHz
 753          */
 754         cts_rate = info->control.rts_cts_rate_idx;
 755
 756         memset(&txhdr->rateset, 0, sizeof(txhdr->rateset));
 757
 758         /* see how many rates got used */
 759         for (i = 0; i < dev->max_rates; i++) {
 760                 if (info->control.rates[i].idx < 0)
 761                         break;
 762                 nrates++;
 763         }
 764
 765         /* limit tries to 8/nrates per rate */
 766         for (i = 0; i < nrates; i++) {
 767                 /*
 768                  * The magic expression here is equivalent to 8/nrates for
 769                  * all values that matter, but avoids division and jumps.
 770                  * Note that nrates can only take the values 1 through 4.
 771                  */
 772                 calculated_tries[i] = min_t(int, ((15 >> nrates) | 1) + 1,
 773                                                  info->control.rates[i].count);
 774                 nremaining -= calculated_tries[i];
 775         }
 776
 777         /* if there are tries left, distribute from back to front */
 778         for (i = nrates - 1; nremaining > 0 && i >= 0; i--) {
 779                 int tmp = info->control.rates[i].count - calculated_tries[i];
 780
 781                 if (tmp <= 0)
 782                         continue;
 783                 /* RC requested more tries at this rate */
 784
 785                 tmp = min_t(int, tmp, nremaining);
 786                 calculated_tries[i] += tmp;
 787                 nremaining -= tmp;
 788         }
 789
 790         ridx = 0;
 791         for (i = 0; i < nrates && ridx < 8; i++) {
 792                 /* we register the rates in perfect order */
 793                 rate = info->control.rates[i].idx;
 794                 if (info->band == IEEE80211_BAND_5GHZ)
 795                         rate += 4;
 796
 797                 /* store the count we actually calculated for TX status */
 798                 info->control.rates[i].count = calculated_tries[i];
 799
 800                 rc_flags = info->control.rates[i].flags;
 801                 if (rc_flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE) {
 802                         rate |= 0x10;
 803                         cts_rate |= 0x10;
 804                 }
 805                 if (rc_flags & IEEE80211_TX_RC_USE_RTS_CTS) {
 806                         burst_allowed = false;
 807                         rate |= 0x40;
 808                 } else if (rc_flags & IEEE80211_TX_RC_USE_CTS_PROTECT) {
 809                         rate |= 0x20;
 810                         burst_allowed = false;
 811                 }
 812                 for (j = 0; j < calculated_tries[i] && ridx < 8; j++) {
 813                         txhdr->rateset[ridx] = rate;
 814                         ridx++;
 815                 }
 816         }
 817
 818         if (burst_allowed)
 819                 hdr_flags |= P54_HDR_FLAG_DATA_OUT_BURST;
 820
 821         /* TODO: enable bursting */
 822         hdr->flags = cpu_to_le16(hdr_flags);
 823         hdr->tries = ridx;
 824         txhdr->rts_rate_idx = 0;
 825         if (info->control.hw_key) {
 826                 txhdr->key_type = p54_convert_algo(info->control.hw_key->alg);
 827                 txhdr->key_len = min((u8)16, info->control.hw_key->keylen);
 828                 memcpy(txhdr->key, info->control.hw_key->key, txhdr->key_len);
 829                 if (info->control.hw_key->alg == ALG_TKIP) {
 830                         /* reserve space for the MIC key */
 831                         len += 8;
 832                         memcpy(skb_put(skb, 8), &(info->control.hw_key->key
 833                                 [NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY]), 8);
 834                 }
 835                 /* reserve some space for ICV */
 836                 len += info->control.hw_key->icv_len;
 837                 memset(skb_put(skb, info->control.hw_key->icv_len), 0,
 838                        info->control.hw_key->icv_len);
 839         } else {
 840                 txhdr->key_type = 0;
 841                 txhdr->key_len = 0;
 842         }
 843         txhdr->crypt_offset = crypt_offset;
 844         txhdr->hw_queue = queue;
 845         txhdr->backlog = priv->tx_stats[queue].len - 1;
 846         memset(txhdr->durations, 0, sizeof(txhdr->durations));
 847         txhdr->tx_antenna = ((info->antenna_sel_tx == 0) ?
 848                 2 : info->antenna_sel_tx - 1) & priv->tx_diversity_mask;
 849         if (priv->rxhw == 5) {
 850                 txhdr->longbow.cts_rate = cts_rate;
 851                 txhdr->longbow.output_power = cpu_to_le16(priv->output_power);
 852         } else {
 853                 txhdr->normal.output_power = priv->output_power;
 854                 txhdr->normal.cts_rate = cts_rate;
 855         }
 856         if (padding)
 857                 txhdr->align[0] = padding;
 858
 859         hdr->len = cpu_to_le16(len);
 860         /* modifies skb->cb and with it info, so must be last! */
 861         p54info = (void *) info->rate_driver_data;
 862         p54info->extra_len = extra_len;
 863
 864         p54_tx(priv, skb);
 865         return NETDEV_TX_OK;
 866 }