linux/drivers/net/wireless/intersil/p54/txrx.c
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   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
  30static 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 */
  82static 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
 150static 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
 166static 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
 185static 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
 215static 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
 236void 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}
 246EXPORT_SYMBOL_GPL(p54_free_skb);
 247
 248static 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
 269void 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
 275static 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 */
 294static 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
 327static 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->flag |= RX_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
 393static 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
 486static 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
 510static 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
 604static 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
 640static 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 */
 669int 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}
 679EXPORT_SYMBOL_GPL(p54_rx);
 680
 681static 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
 759static 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
 774void 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                memset(skb_put(skb, info->control.hw_key->icv_len), 0,
 914                       info->control.hw_key->icv_len);
 915        } else {
 916                txhdr->key_type = 0;
 917                txhdr->key_len = 0;
 918        }
 919        txhdr->crypt_offset = crypt_offset;
 920        txhdr->hw_queue = queue;
 921        txhdr->backlog = priv->tx_stats[queue].len - 1;
 922        memset(txhdr->durations, 0, sizeof(txhdr->durations));
 923        txhdr->tx_antenna = 2 & priv->tx_diversity_mask;
 924        if (priv->rxhw == 5) {
 925                txhdr->longbow.cts_rate = cts_rate;
 926                txhdr->longbow.output_power = cpu_to_le16(priv->output_power);
 927        } else {
 928                txhdr->normal.output_power = priv->output_power;
 929                txhdr->normal.cts_rate = cts_rate;
 930        }
 931        if (padding)
 932                txhdr->align[0] = padding;
 933
 934        hdr->len = cpu_to_le16(len);
 935        /* modifies skb->cb and with it info, so must be last! */
 936        p54info = (void *) info->rate_driver_data;
 937        p54info->extra_len = extra_len;
 938
 939        p54_tx(priv, skb);
 940}
 941