drivers/net/wireless/intersil/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/export.h>
  20 #include <linux/firmware.h>
  21 #include <linux/etherdevice.h>
  22 #include <asm/div64.h>
  23
  24 #include <net/mac80211.h>
  25
  26 #include "p54.h"
  27 #include "lmac.h"
  28
  29 #ifdef P54_MM_DEBUG
  30 static void p54_dump_tx_queue(struct p54_common *priv)
  31 {
  32         unsigned long flags;
  33         struct ieee80211_tx_info *info;
  34         struct p54_tx_info *range;
  35         struct sk_buff *skb;
  36         struct p54_hdr *hdr;
  37         unsigned int i = 0;
  38         u32 prev_addr;
  39         u32 largest_hole = 0, free;
  40
  41         spin_lock_irqsave(&priv->tx_queue.lock, flags);
  42         wiphy_debug(priv->hw->wiphy, "/ --- tx queue dump (%d entries) ---\n",
  43                     skb_queue_len(&priv->tx_queue));
  44
  45         prev_addr = priv->rx_start;
  46         skb_queue_walk(&priv->tx_queue, skb) {
  47                 info = IEEE80211_SKB_CB(skb);
  48                 range = (void *) info->rate_driver_data;
  49                 hdr = (void *) skb->data;
  50
  51                 free = range->start_addr - prev_addr;
  52                 wiphy_debug(priv->hw->wiphy,
  53                             "| [%02d] => [skb:%p skb_len:0x%04x "
  54                             "hdr:{flags:%02x len:%04x req_id:%04x type:%02x} "
  55                             "mem:{start:%04x end:%04x, free:%d}]\n",
  56                             i++, skb, skb->len,
  57                             le16_to_cpu(hdr->flags), le16_to_cpu(hdr->len),
  58                             le32_to_cpu(hdr->req_id), le16_to_cpu(hdr->type),
  59                             range->start_addr, range->end_addr, free);
  60
  61                 prev_addr = range->end_addr;
  62                 largest_hole = max(largest_hole, free);
  63         }
  64         free = priv->rx_end - prev_addr;
  65         largest_hole = max(largest_hole, free);
  66         wiphy_debug(priv->hw->wiphy,
  67                     "\\ --- [free: %d], largest free block: %d ---\n",
  68                     free, largest_hole);
  69         spin_unlock_irqrestore(&priv->tx_queue.lock, flags);
  70 }
  71 #endif /* P54_MM_DEBUG */
  72
  73 /*
  74  * So, the firmware is somewhat stupid and doesn't know what places in its
  75  * memory incoming data should go to. By poking around in the firmware, we
  76  * can find some unused memory to upload our packets to. However, data that we
  77  * want the card to TX needs to stay intact until the card has told us that
  78  * it is done with it. This function finds empty places we can upload to and
  79  * marks allocated areas as reserved if necessary. p54_find_and_unlink_skb or
  80  * p54_free_skb frees allocated areas.
  81  */
  82 static int p54_assign_address(struct p54_common *priv, struct sk_buff *skb)
  83 {
  84         struct sk_buff *entry, *target_skb = NULL;
  85         struct ieee80211_tx_info *info;
  86         struct p54_tx_info *range;
  87         struct p54_hdr *data = (void *) skb->data;
  88         unsigned long flags;
  89         u32 last_addr = priv->rx_start;
  90         u32 target_addr = priv->rx_start;
  91         u16 len = priv->headroom + skb->len + priv->tailroom + 3;
  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 (!target_skb && hole_size >= len) {
 115                         target_skb = entry->prev;
 116                         hole_size -= len;
 117                         target_addr = last_addr;
 118                         break;
 119                 }
 120                 last_addr = range->end_addr;
 121         }
 122         if (unlikely(!target_skb)) {
 123                 if (priv->rx_end - last_addr >= len) {
 124                         target_skb = priv->tx_queue.prev;
 125                         if (!skb_queue_empty(&priv->tx_queue)) {
 126                                 info = IEEE80211_SKB_CB(target_skb);
 127                                 range = (void *)info->rate_driver_data;
 128                                 target_addr = range->end_addr;
 129                         }
 130                 } else {
 131                         spin_unlock_irqrestore(&priv->tx_queue.lock, flags);
 132                         return -ENOSPC;
 133                 }
 134         }
 135
 136         info = IEEE80211_SKB_CB(skb);
 137         range = (void *) info->rate_driver_data;
 138         range->start_addr = target_addr;
 139         range->end_addr = target_addr + len;
 140         data->req_id = cpu_to_le32(target_addr + priv->headroom);
 141         if (IS_DATA_FRAME(skb) &&
 142             unlikely(GET_HW_QUEUE(skb) == P54_QUEUE_BEACON))
 143                 priv->beacon_req_id = data->req_id;
 144
 145         __skb_queue_after(&priv->tx_queue, target_skb, skb);
 146         spin_unlock_irqrestore(&priv->tx_queue.lock, flags);
 147         return 0;
 148 }
 149
 150 static void p54_tx_pending(struct p54_common *priv)
 151 {
 152         struct sk_buff *skb;
 153         int ret;
 154
 155         skb = skb_dequeue(&priv->tx_pending);
 156         if (unlikely(!skb))
 157                 return ;
 158
 159         ret = p54_assign_address(priv, skb);
 160         if (unlikely(ret))
 161                 skb_queue_head(&priv->tx_pending, skb);
 162         else
 163                 priv->tx(priv->hw, skb);
 164 }
 165
 166 static void p54_wake_queues(struct p54_common *priv)
 167 {
 168         unsigned long flags;
 169         unsigned int i;
 170
 171         if (unlikely(priv->mode == NL80211_IFTYPE_UNSPECIFIED))
 172                 return ;
 173
 174         p54_tx_pending(priv);
 175
 176         spin_lock_irqsave(&priv->tx_stats_lock, flags);
 177         for (i = 0; i < priv->hw->queues; i++) {
 178                 if (priv->tx_stats[i + P54_QUEUE_DATA].len <
 179                     priv->tx_stats[i + P54_QUEUE_DATA].limit)
 180                         ieee80211_wake_queue(priv->hw, i);
 181         }
 182         spin_unlock_irqrestore(&priv->tx_stats_lock, flags);
 183 }
 184
 185 static int p54_tx_qos_accounting_alloc(struct p54_common *priv,
 186                                        struct sk_buff *skb,
 187                                        const u16 p54_queue)
 188 {
 189         struct p54_tx_queue_stats *queue;
 190         unsigned long flags;
 191
 192         if (WARN_ON(p54_queue >= P54_QUEUE_NUM))
 193                 return -EINVAL;
 194
 195         queue = &priv->tx_stats[p54_queue];
 196
 197         spin_lock_irqsave(&priv->tx_stats_lock, flags);
 198         if (unlikely(queue->len >= queue->limit && IS_QOS_QUEUE(p54_queue))) {
 199                 spin_unlock_irqrestore(&priv->tx_stats_lock, flags);
 200                 return -ENOSPC;
 201         }
 202
 203         queue->len++;
 204         queue->count++;
 205
 206         if (unlikely(queue->len == queue->limit && IS_QOS_QUEUE(p54_queue))) {
 207                 u16 ac_queue = p54_queue - P54_QUEUE_DATA;
 208                 ieee80211_stop_queue(priv->hw, ac_queue);
 209         }
 210
 211         spin_unlock_irqrestore(&priv->tx_stats_lock, flags);
 212         return 0;
 213 }
 214
 215 static void p54_tx_qos_accounting_free(struct p54_common *priv,
 216                                        struct sk_buff *skb)
 217 {
 218         if (IS_DATA_FRAME(skb)) {
 219                 unsigned long flags;
 220
 221                 spin_lock_irqsave(&priv->tx_stats_lock, flags);
 222                 priv->tx_stats[GET_HW_QUEUE(skb)].len--;
 223                 spin_unlock_irqrestore(&priv->tx_stats_lock, flags);
 224
 225                 if (unlikely(GET_HW_QUEUE(skb) == P54_QUEUE_BEACON)) {
 226                         if (priv->beacon_req_id == GET_REQ_ID(skb)) {
 227                                 /* this is the  active beacon set anymore */
 228                                 priv->beacon_req_id = 0;
 229                         }
 230                         complete(&priv->beacon_comp);
 231                 }
 232         }
 233         p54_wake_queues(priv);
 234 }
 235
 236 void p54_free_skb(struct ieee80211_hw *dev, struct sk_buff *skb)
 237 {
 238         struct p54_common *priv = dev->priv;
 239         if (unlikely(!skb))
 240                 return ;
 241
 242         skb_unlink(skb, &priv->tx_queue);
 243         p54_tx_qos_accounting_free(priv, skb);
 244         ieee80211_free_txskb(dev, skb);
 245 }
 246 EXPORT_SYMBOL_GPL(p54_free_skb);
 247
 248 static struct sk_buff *p54_find_and_unlink_skb(struct p54_common *priv,
 249                                                const __le32 req_id)
 250 {
 251         struct sk_buff *entry;
 252         unsigned long flags;
 253
 254         spin_lock_irqsave(&priv->tx_queue.lock, flags);
 255         skb_queue_walk(&priv->tx_queue, entry) {
 256                 struct p54_hdr *hdr = (struct p54_hdr *) entry->data;
 257
 258                 if (hdr->req_id == req_id) {
 259                         __skb_unlink(entry, &priv->tx_queue);
 260                         spin_unlock_irqrestore(&priv->tx_queue.lock, flags);
 261                         p54_tx_qos_accounting_free(priv, entry);
 262                         return entry;
 263                 }
 264         }
 265         spin_unlock_irqrestore(&priv->tx_queue.lock, flags);
 266         return NULL;
 267 }
 268
 269 void p54_tx(struct p54_common *priv, struct sk_buff *skb)
 270 {
 271         skb_queue_tail(&priv->tx_pending, skb);
 272         p54_tx_pending(priv);
 273 }
 274
 275 static int p54_rssi_to_dbm(struct p54_common *priv, int rssi)
 276 {
 277         if (priv->rxhw != 5) {
 278                 return ((rssi * priv->cur_rssi->mul) / 64 +
 279                          priv->cur_rssi->add) / 4;
 280         } else {
 281                 /*
 282                  * TODO: find the correct formula
 283                  */
 284                 return rssi / 2 - 110;
 285         }
 286 }
 287
 288 /*
 289  * Even if the firmware is capable of dealing with incoming traffic,
 290  * while dozing, we have to prepared in case mac80211 uses PS-POLL
 291  * to retrieve outstanding frames from our AP.
 292  * (see comment in net/mac80211/mlme.c @ line 1993)
 293  */
 294 static void p54_pspoll_workaround(struct p54_common *priv, struct sk_buff *skb)
 295 {
 296         struct ieee80211_hdr *hdr = (void *) skb->data;
 297         struct ieee80211_tim_ie *tim_ie;
 298         u8 *tim;
 299         u8 tim_len;
 300         bool new_psm;
 301
 302         /* only beacons have a TIM IE */
 303         if (!ieee80211_is_beacon(hdr->frame_control))
 304                 return;
 305
 306         if (!priv->aid)
 307                 return;
 308
 309         /* only consider beacons from the associated BSSID */
 310         if (!ether_addr_equal_64bits(hdr->addr3, priv->bssid))
 311                 return;
 312
 313         tim = p54_find_ie(skb, WLAN_EID_TIM);
 314         if (!tim)
 315                 return;
 316
 317         tim_len = tim[1];
 318         tim_ie = (struct ieee80211_tim_ie *) &tim[2];
 319
 320         new_psm = ieee80211_check_tim(tim_ie, tim_len, priv->aid);
 321         if (new_psm != priv->powersave_override) {
 322                 priv->powersave_override = new_psm;
 323                 p54_set_ps(priv);
 324         }
 325 }
 326
 327 static int p54_rx_data(struct p54_common *priv, struct sk_buff *skb)
 328 {
 329         struct p54_rx_data *hdr = (struct p54_rx_data *) skb->data;
 330         struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
 331         u16 freq = le16_to_cpu(hdr->freq);
 332         size_t header_len = sizeof(*hdr);
 333         u32 tsf32;
 334         u8 rate = hdr->rate & 0xf;
 335
 336         /*
 337          * If the device is in a unspecified state we have to
 338          * ignore all data frames. Else we could end up with a
 339          * nasty crash.
 340          */
 341         if (unlikely(priv->mode == NL80211_IFTYPE_UNSPECIFIED))
 342                 return 0;
 343
 344         if (!(hdr->flags & cpu_to_le16(P54_HDR_FLAG_DATA_IN_FCS_GOOD)))
 345                 return 0;
 346
 347         if (hdr->decrypt_status == P54_DECRYPT_OK)
 348                 rx_status->flag |= RX_FLAG_DECRYPTED;
 349         if ((hdr->decrypt_status == P54_DECRYPT_FAIL_MICHAEL) ||
 350             (hdr->decrypt_status == P54_DECRYPT_FAIL_TKIP))
 351                 rx_status->flag |= RX_FLAG_MMIC_ERROR;
 352
 353         rx_status->signal = p54_rssi_to_dbm(priv, hdr->rssi);
 354         if (hdr->rate & 0x10)
 355                 rx_status->enc_flags |= RX_ENC_FLAG_SHORTPRE;
 356         if (priv->hw->conf.chandef.chan->band == NL80211_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.chandef.chan->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         /* LMAC API Page 10/29 - s_lm_data_in - clock
 372          * "usec accurate timestamp of hardware clock
 373          * at end of frame (before OFDM SIFS EOF padding"
 374          */
 375         rx_status->flag |= RX_FLAG_MACTIME_END;
 376
 377         if (hdr->flags & cpu_to_le16(P54_HDR_FLAG_DATA_ALIGN))
 378                 header_len += hdr->align[0];
 379
 380         skb_pull(skb, header_len);
 381         skb_trim(skb, le16_to_cpu(hdr->len));
 382         if (unlikely(priv->hw->conf.flags & IEEE80211_CONF_PS))
 383                 p54_pspoll_workaround(priv, skb);
 384
 385         ieee80211_rx_irqsafe(priv->hw, skb);
 386
 387         ieee80211_queue_delayed_work(priv->hw, &priv->work,
 388                            msecs_to_jiffies(P54_STATISTICS_UPDATE));
 389
 390         return -1;
 391 }
 392
 393 static void p54_rx_frame_sent(struct p54_common *priv, struct sk_buff *skb)
 394 {
 395         struct p54_hdr *hdr = (struct p54_hdr *) skb->data;
 396         struct p54_frame_sent *payload = (struct p54_frame_sent *) hdr->data;
 397         struct ieee80211_tx_info *info;
 398         struct p54_hdr *entry_hdr;
 399         struct p54_tx_data *entry_data;
 400         struct sk_buff *entry;
 401         unsigned int pad = 0, frame_len;
 402         int count, idx;
 403
 404         entry = p54_find_and_unlink_skb(priv, hdr->req_id);
 405         if (unlikely(!entry))
 406                 return ;
 407
 408         frame_len = entry->len;
 409         info = IEEE80211_SKB_CB(entry);
 410         entry_hdr = (struct p54_hdr *) entry->data;
 411         entry_data = (struct p54_tx_data *) entry_hdr->data;
 412         priv->stats.dot11ACKFailureCount += payload->tries - 1;
 413
 414         /*
 415          * Frames in P54_QUEUE_FWSCAN and P54_QUEUE_BEACON are
 416          * generated by the driver. Therefore tx_status is bogus
 417          * and we don't want to confuse the mac80211 stack.
 418          */
 419         if (unlikely(entry_data->hw_queue < P54_QUEUE_FWSCAN)) {
 420                 dev_kfree_skb_any(entry);
 421                 return ;
 422         }
 423
 424         /*
 425          * Clear manually, ieee80211_tx_info_clear_status would
 426          * clear the counts too and we need them.
 427          */
 428         memset(&info->status.ack_signal, 0,
 429                sizeof(struct ieee80211_tx_info) -
 430                offsetof(struct ieee80211_tx_info, status.ack_signal));
 431         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info,
 432                               status.ack_signal) != 20);
 433
 434         if (entry_hdr->flags & cpu_to_le16(P54_HDR_FLAG_DATA_ALIGN))
 435                 pad = entry_data->align[0];
 436
 437         /* walk through the rates array and adjust the counts */
 438         count = payload->tries;
 439         for (idx = 0; idx < 4; idx++) {
 440                 if (count >= info->status.rates[idx].count) {
 441                         count -= info->status.rates[idx].count;
 442                 } else if (count > 0) {
 443                         info->status.rates[idx].count = count;
 444                         count = 0;
 445                 } else {
 446                         info->status.rates[idx].idx = -1;
 447                         info->status.rates[idx].count = 0;
 448                 }
 449         }
 450
 451         if (!(info->flags & IEEE80211_TX_CTL_NO_ACK) &&
 452              !(payload->status & P54_TX_FAILED))
 453                 info->flags |= IEEE80211_TX_STAT_ACK;
 454         if (payload->status & P54_TX_PSM_CANCELLED)
 455                 info->flags |= IEEE80211_TX_STAT_TX_FILTERED;
 456         info->status.ack_signal = p54_rssi_to_dbm(priv,
 457                                                   (int)payload->ack_rssi);
 458
 459         /* Undo all changes to the frame. */
 460         switch (entry_data->key_type) {
 461         case P54_CRYPTO_TKIPMICHAEL: {
 462                 u8 *iv = (u8 *)(entry_data->align + pad +
 463                                 entry_data->crypt_offset);
 464
 465                 /* Restore the original TKIP IV. */
 466                 iv[2] = iv[0];
 467                 iv[0] = iv[1];
 468                 iv[1] = (iv[0] | 0x20) & 0x7f;  /* WEPSeed - 8.3.2.2 */
 469
 470                 frame_len -= 12; /* remove TKIP_MMIC + TKIP_ICV */
 471                 break;
 472                 }
 473         case P54_CRYPTO_AESCCMP:
 474                 frame_len -= 8; /* remove CCMP_MIC */
 475                 break;
 476         case P54_CRYPTO_WEP:
 477                 frame_len -= 4; /* remove WEP_ICV */
 478                 break;
 479         }
 480
 481         skb_trim(entry, frame_len);
 482         skb_pull(entry, sizeof(*hdr) + pad + sizeof(*entry_data));
 483         ieee80211_tx_status_irqsafe(priv->hw, entry);
 484 }
 485
 486 static void p54_rx_eeprom_readback(struct p54_common *priv,
 487                                    struct sk_buff *skb)
 488 {
 489         struct p54_hdr *hdr = (struct p54_hdr *) skb->data;
 490         struct p54_eeprom_lm86 *eeprom = (struct p54_eeprom_lm86 *) hdr->data;
 491         struct sk_buff *tmp;
 492
 493         if (!priv->eeprom)
 494                 return ;
 495
 496         if (priv->fw_var >= 0x509) {
 497                 memcpy(priv->eeprom, eeprom->v2.data,
 498                        le16_to_cpu(eeprom->v2.len));
 499         } else {
 500                 memcpy(priv->eeprom, eeprom->v1.data,
 501                        le16_to_cpu(eeprom->v1.len));
 502         }
 503
 504         priv->eeprom = NULL;
 505         tmp = p54_find_and_unlink_skb(priv, hdr->req_id);
 506         dev_kfree_skb_any(tmp);
 507         complete(&priv->eeprom_comp);
 508 }
 509
 510 static void p54_rx_stats(struct p54_common *priv, struct sk_buff *skb)
 511 {
 512         struct p54_hdr *hdr = (struct p54_hdr *) skb->data;
 513         struct p54_statistics *stats = (struct p54_statistics *) hdr->data;
 514         struct sk_buff *tmp;
 515         struct ieee80211_channel *chan;
 516         unsigned int i, rssi, tx, cca, dtime, dtotal, dcca, dtx, drssi, unit;
 517         u32 tsf32;
 518
 519         if (unlikely(priv->mode == NL80211_IFTYPE_UNSPECIFIED))
 520                 return ;
 521
 522         tsf32 = le32_to_cpu(stats->tsf32);
 523         if (tsf32 < priv->tsf_low32)
 524                 priv->tsf_high32++;
 525         priv->tsf_low32 = tsf32;
 526
 527         priv->stats.dot11RTSFailureCount = le32_to_cpu(stats->rts_fail);
 528         priv->stats.dot11RTSSuccessCount = le32_to_cpu(stats->rts_success);
 529         priv->stats.dot11FCSErrorCount = le32_to_cpu(stats->rx_bad_fcs);
 530
 531         priv->noise = p54_rssi_to_dbm(priv, le32_to_cpu(stats->noise));
 532
 533         /*
 534          * STSW450X LMAC API page 26 - 3.8 Statistics
 535          * "The exact measurement period can be derived from the
 536          * timestamp member".
 537          */
 538         dtime = tsf32 - priv->survey_raw.timestamp;
 539
 540         /*
 541          * STSW450X LMAC API page 26 - 3.8.1 Noise histogram
 542          * The LMAC samples RSSI, CCA and transmit state at regular
 543          * periods (typically 8 times per 1k [as in 1024] usec).
 544          */
 545         cca = le32_to_cpu(stats->sample_cca);
 546         tx = le32_to_cpu(stats->sample_tx);
 547         rssi = 0;
 548         for (i = 0; i < ARRAY_SIZE(stats->sample_noise); i++)
 549                 rssi += le32_to_cpu(stats->sample_noise[i]);
 550
 551         dcca = cca - priv->survey_raw.cached_cca;
 552         drssi = rssi - priv->survey_raw.cached_rssi;
 553         dtx = tx - priv->survey_raw.cached_tx;
 554         dtotal = dcca + drssi + dtx;
 555
 556         /*
 557          * update statistics when more than a second is over since the
 558          * last call, or when a update is badly needed.
 559          */
 560         if (dtotal && (priv->update_stats || dtime >= USEC_PER_SEC) &&
 561             dtime >= dtotal) {
 562                 priv->survey_raw.timestamp = tsf32;
 563                 priv->update_stats = false;
 564                 unit = dtime / dtotal;
 565
 566                 if (dcca) {
 567                         priv->survey_raw.cca += dcca * unit;
 568                         priv->survey_raw.cached_cca = cca;
 569                 }
 570                 if (dtx) {
 571                         priv->survey_raw.tx += dtx * unit;
 572                         priv->survey_raw.cached_tx = tx;
 573                 }
 574                 if (drssi) {
 575                         priv->survey_raw.rssi += drssi * unit;
 576                         priv->survey_raw.cached_rssi = rssi;
 577                 }
 578
 579                 /* 1024 usec / 8 times = 128 usec / time */
 580                 if (!(priv->phy_ps || priv->phy_idle))
 581                         priv->survey_raw.active += dtotal * unit;
 582                 else
 583                         priv->survey_raw.active += (dcca + dtx) * unit;
 584         }
 585
 586         chan = priv->curchan;
 587         if (chan) {
 588                 struct survey_info *survey = &priv->survey[chan->hw_value];
 589                 survey->noise = clamp(priv->noise, -128, 127);
 590                 survey->time = priv->survey_raw.active;
 591                 survey->time_tx = priv->survey_raw.tx;
 592                 survey->time_busy = priv->survey_raw.tx +
 593                         priv->survey_raw.cca;
 594                 do_div(survey->time, 1024);
 595                 do_div(survey->time_tx, 1024);
 596                 do_div(survey->time_busy, 1024);
 597         }
 598
 599         tmp = p54_find_and_unlink_skb(priv, hdr->req_id);
 600         dev_kfree_skb_any(tmp);
 601         complete(&priv->stat_comp);
 602 }
 603
 604 static void p54_rx_trap(struct p54_common *priv, struct sk_buff *skb)
 605 {
 606         struct p54_hdr *hdr = (struct p54_hdr *) skb->data;
 607         struct p54_trap *trap = (struct p54_trap *) hdr->data;
 608         u16 event = le16_to_cpu(trap->event);
 609         u16 freq = le16_to_cpu(trap->frequency);
 610
 611         switch (event) {
 612         case P54_TRAP_BEACON_TX:
 613                 break;
 614         case P54_TRAP_RADAR:
 615                 wiphy_info(priv->hw->wiphy, "radar (freq:%d MHz)\n", freq);
 616                 break;
 617         case P54_TRAP_NO_BEACON:
 618                 if (priv->vif)
 619                         ieee80211_beacon_loss(priv->vif);
 620                 break;
 621         case P54_TRAP_SCAN:
 622                 break;
 623         case P54_TRAP_TBTT:
 624                 break;
 625         case P54_TRAP_TIMER:
 626                 break;
 627         case P54_TRAP_FAA_RADIO_OFF:
 628                 wiphy_rfkill_set_hw_state(priv->hw->wiphy, true);
 629                 break;
 630         case P54_TRAP_FAA_RADIO_ON:
 631                 wiphy_rfkill_set_hw_state(priv->hw->wiphy, false);
 632                 break;
 633         default:
 634                 wiphy_info(priv->hw->wiphy, "received event:%x freq:%d\n",
 635                            event, freq);
 636                 break;
 637         }
 638 }
 639
 640 static int p54_rx_control(struct p54_common *priv, struct sk_buff *skb)
 641 {
 642         struct p54_hdr *hdr = (struct p54_hdr *) skb->data;
 643
 644         switch (le16_to_cpu(hdr->type)) {
 645         case P54_CONTROL_TYPE_TXDONE:
 646                 p54_rx_frame_sent(priv, skb);
 647                 break;
 648         case P54_CONTROL_TYPE_TRAP:
 649                 p54_rx_trap(priv, skb);
 650                 break;
 651         case P54_CONTROL_TYPE_BBP:
 652                 break;
 653         case P54_CONTROL_TYPE_STAT_READBACK:
 654                 p54_rx_stats(priv, skb);
 655                 break;
 656         case P54_CONTROL_TYPE_EEPROM_READBACK:
 657                 p54_rx_eeprom_readback(priv, skb);
 658                 break;
 659         default:
 660                 wiphy_debug(priv->hw->wiphy,
 661                             "not handling 0x%02x type control frame\n",
 662                             le16_to_cpu(hdr->type));
 663                 break;
 664         }
 665         return 0;
 666 }
 667
 668 /* returns zero if skb can be reused */
 669 int p54_rx(struct ieee80211_hw *dev, struct sk_buff *skb)
 670 {
 671         struct p54_common *priv = dev->priv;
 672         u16 type = le16_to_cpu(*((__le16 *)skb->data));
 673
 674         if (type & P54_HDR_FLAG_CONTROL)
 675                 return p54_rx_control(priv, skb);
 676         else
 677                 return p54_rx_data(priv, skb);
 678 }
 679 EXPORT_SYMBOL_GPL(p54_rx);
 680
 681 static void p54_tx_80211_header(struct p54_common *priv, struct sk_buff *skb,
 682                                 struct ieee80211_tx_info *info,
 683                                 struct ieee80211_sta *sta,
 684                                 u8 *queue, u32 *extra_len, u16 *flags, u16 *aid,
 685                                 bool *burst_possible)
 686 {
 687         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 688
 689         if (ieee80211_is_data_qos(hdr->frame_control))
 690                 *burst_possible = true;
 691         else
 692                 *burst_possible = false;
 693
 694         if (!(info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ))
 695                 *flags |= P54_HDR_FLAG_DATA_OUT_SEQNR;
 696
 697         if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER)
 698                 *flags |= P54_HDR_FLAG_DATA_OUT_NOCANCEL;
 699
 700         if (info->flags & IEEE80211_TX_CTL_CLEAR_PS_FILT)
 701                 *flags |= P54_HDR_FLAG_DATA_OUT_NOCANCEL;
 702
 703         *queue = skb_get_queue_mapping(skb) + P54_QUEUE_DATA;
 704
 705         switch (priv->mode) {
 706         case NL80211_IFTYPE_MONITOR:
 707                 /*
 708                  * We have to set P54_HDR_FLAG_DATA_OUT_PROMISC for
 709                  * every frame in promiscuous/monitor mode.
 710                  * see STSW45x0C LMAC API - page 12.
 711                  */
 712                 *aid = 0;
 713                 *flags |= P54_HDR_FLAG_DATA_OUT_PROMISC;
 714                 break;
 715         case NL80211_IFTYPE_STATION:
 716                 *aid = 1;
 717                 break;
 718         case NL80211_IFTYPE_AP:
 719         case NL80211_IFTYPE_ADHOC:
 720         case NL80211_IFTYPE_MESH_POINT:
 721                 if (info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) {
 722                         *aid = 0;
 723                         *queue = P54_QUEUE_CAB;
 724                         return;
 725                 }
 726
 727                 if (unlikely(ieee80211_is_mgmt(hdr->frame_control))) {
 728                         if (ieee80211_is_probe_resp(hdr->frame_control)) {
 729                                 *aid = 0;
 730                                 *flags |= P54_HDR_FLAG_DATA_OUT_TIMESTAMP |
 731                                           P54_HDR_FLAG_DATA_OUT_NOCANCEL;
 732                                 return;
 733                         } else if (ieee80211_is_beacon(hdr->frame_control)) {
 734                                 *aid = 0;
 735
 736                                 if (info->flags & IEEE80211_TX_CTL_INJECTED) {
 737                                         /*
 738                                          * Injecting beacons on top of a AP is
 739                                          * not a good idea... nevertheless,
 740                                          * it should be doable.
 741                                          */
 742
 743                                         return;
 744                                 }
 745
 746                                 *flags |= P54_HDR_FLAG_DATA_OUT_TIMESTAMP;
 747                                 *queue = P54_QUEUE_BEACON;
 748                                 *extra_len = IEEE80211_MAX_TIM_LEN;
 749                                 return;
 750                         }
 751                 }
 752
 753                 if (sta)
 754                         *aid = sta->aid;
 755                 break;
 756         }
 757 }
 758
 759 static u8 p54_convert_algo(u32 cipher)
 760 {
 761         switch (cipher) {
 762         case WLAN_CIPHER_SUITE_WEP40:
 763         case WLAN_CIPHER_SUITE_WEP104:
 764                 return P54_CRYPTO_WEP;
 765         case WLAN_CIPHER_SUITE_TKIP:
 766                 return P54_CRYPTO_TKIPMICHAEL;
 767         case WLAN_CIPHER_SUITE_CCMP:
 768                 return P54_CRYPTO_AESCCMP;
 769         default:
 770                 return 0;
 771         }
 772 }
 773
 774 void p54_tx_80211(struct ieee80211_hw *dev,
 775                   struct ieee80211_tx_control *control,
 776                   struct sk_buff *skb)
 777 {
 778         struct p54_common *priv = dev->priv;
 779         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 780         struct p54_tx_info *p54info;
 781         struct p54_hdr *hdr;
 782         struct p54_tx_data *txhdr;
 783         unsigned int padding, len, extra_len = 0;
 784         int i, j, ridx;
 785         u16 hdr_flags = 0, aid = 0;
 786         u8 rate, queue = 0, crypt_offset = 0;
 787         u8 cts_rate = 0x20;
 788         u8 rc_flags;
 789         u8 calculated_tries[4];
 790         u8 nrates = 0, nremaining = 8;
 791         bool burst_allowed = false;
 792
 793         p54_tx_80211_header(priv, skb, info, control->sta, &queue, &extra_len,
 794                             &hdr_flags, &aid, &burst_allowed);
 795
 796         if (p54_tx_qos_accounting_alloc(priv, skb, queue)) {
 797                 ieee80211_free_txskb(dev, skb);
 798                 return;
 799         }
 800
 801         padding = (unsigned long)(skb->data - (sizeof(*hdr) + sizeof(*txhdr))) & 3;
 802         len = skb->len;
 803
 804         if (info->control.hw_key) {
 805                 crypt_offset = ieee80211_get_hdrlen_from_skb(skb);
 806                 if (info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
 807                         u8 *iv = (u8 *)(skb->data + crypt_offset);
 808                         /*
 809                          * The firmware excepts that the IV has to have
 810                          * this special format
 811                          */
 812                         iv[1] = iv[0];
 813                         iv[0] = iv[2];
 814                         iv[2] = 0;
 815                 }
 816         }
 817
 818         txhdr = (struct p54_tx_data *) skb_push(skb, sizeof(*txhdr) + padding);
 819         hdr = (struct p54_hdr *) skb_push(skb, sizeof(*hdr));
 820
 821         if (padding)
 822                 hdr_flags |= P54_HDR_FLAG_DATA_ALIGN;
 823         hdr->type = cpu_to_le16(aid);
 824         hdr->rts_tries = info->control.rates[0].count;
 825
 826         /*
 827          * we register the rates in perfect order, and
 828          * RTS/CTS won't happen on 5 GHz
 829          */
 830         cts_rate = info->control.rts_cts_rate_idx;
 831
 832         memset(&txhdr->rateset, 0, sizeof(txhdr->rateset));
 833
 834         /* see how many rates got used */
 835         for (i = 0; i < dev->max_rates; i++) {
 836                 if (info->control.rates[i].idx < 0)
 837                         break;
 838                 nrates++;
 839         }
 840
 841         /* limit tries to 8/nrates per rate */
 842         for (i = 0; i < nrates; i++) {
 843                 /*
 844                  * The magic expression here is equivalent to 8/nrates for
 845                  * all values that matter, but avoids division and jumps.
 846                  * Note that nrates can only take the values 1 through 4.
 847                  */
 848                 calculated_tries[i] = min_t(int, ((15 >> nrates) | 1) + 1,
 849                                                  info->control.rates[i].count);
 850                 nremaining -= calculated_tries[i];
 851         }
 852
 853         /* if there are tries left, distribute from back to front */
 854         for (i = nrates - 1; nremaining > 0 && i >= 0; i--) {
 855                 int tmp = info->control.rates[i].count - calculated_tries[i];
 856
 857                 if (tmp <= 0)
 858                         continue;
 859                 /* RC requested more tries at this rate */
 860
 861                 tmp = min_t(int, tmp, nremaining);
 862                 calculated_tries[i] += tmp;
 863                 nremaining -= tmp;
 864         }
 865
 866         ridx = 0;
 867         for (i = 0; i < nrates && ridx < 8; i++) {
 868                 /* we register the rates in perfect order */
 869                 rate = info->control.rates[i].idx;
 870                 if (info->band == NL80211_BAND_5GHZ)
 871                         rate += 4;
 872
 873                 /* store the count we actually calculated for TX status */
 874                 info->control.rates[i].count = calculated_tries[i];
 875
 876                 rc_flags = info->control.rates[i].flags;
 877                 if (rc_flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE) {
 878                         rate |= 0x10;
 879                         cts_rate |= 0x10;
 880                 }
 881                 if (rc_flags & IEEE80211_TX_RC_USE_RTS_CTS) {
 882                         burst_allowed = false;
 883                         rate |= 0x40;
 884                 } else if (rc_flags & IEEE80211_TX_RC_USE_CTS_PROTECT) {
 885                         rate |= 0x20;
 886                         burst_allowed = false;
 887                 }
 888                 for (j = 0; j < calculated_tries[i] && ridx < 8; j++) {
 889                         txhdr->rateset[ridx] = rate;
 890                         ridx++;
 891                 }
 892         }
 893
 894         if (burst_allowed)
 895                 hdr_flags |= P54_HDR_FLAG_DATA_OUT_BURST;
 896
 897         /* TODO: enable bursting */
 898         hdr->flags = cpu_to_le16(hdr_flags);
 899         hdr->tries = ridx;
 900         txhdr->rts_rate_idx = 0;
 901         if (info->control.hw_key) {
 902                 txhdr->key_type = p54_convert_algo(info->control.hw_key->cipher);
 903                 txhdr->key_len = min((u8)16, info->control.hw_key->keylen);
 904                 memcpy(txhdr->key, info->control.hw_key->key, txhdr->key_len);
 905                 if (info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
 906                         /* reserve space for the MIC key */
 907                         len += 8;
 908                         memcpy(skb_put(skb, 8), &(info->control.hw_key->key
 909                                 [NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY]), 8);
 910                 }
 911                 /* reserve some space for ICV */
 912                 len += info->control.hw_key->icv_len;
 913                 skb_put_zero(skb, info->control.hw_key->icv_len);
 914         } else {
 915                 txhdr->key_type = 0;
 916                 txhdr->key_len = 0;
 917         }
 918         txhdr->crypt_offset = crypt_offset;
 919         txhdr->hw_queue = queue;
 920         txhdr->backlog = priv->tx_stats[queue].len - 1;
 921         memset(txhdr->durations, 0, sizeof(txhdr->durations));
 922         txhdr->tx_antenna = 2 & priv->tx_diversity_mask;
 923         if (priv->rxhw == 5) {
 924                 txhdr->longbow.cts_rate = cts_rate;
 925                 txhdr->longbow.output_power = cpu_to_le16(priv->output_power);
 926         } else {
 927                 txhdr->normal.output_power = priv->output_power;
 928                 txhdr->normal.cts_rate = cts_rate;
 929         }
 930         if (padding)
 931                 txhdr->align[0] = padding;
 932
 933         hdr->len = cpu_to_le16(len);
 934         /* modifies skb->cb and with it info, so must be last! */
 935         p54info = (void *) info->rate_driver_data;
 936         p54info->extra_len = extra_len;
 937
 938         p54_tx(priv, skb);
 939 }