drivers/net/wireless/iwlwifi/iwl-agn-tx.c

   1 /******************************************************************************
   2  *
   3  * GPL LICENSE SUMMARY
   4  *
   5  * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of version 2 of the GNU General Public License as
   9  * published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
  19  * USA
  20  *
  21  * The full GNU General Public License is included in this distribution
  22  * in the file called LICENSE.GPL.
  23  *
  24  * Contact Information:
  25  *  Intel Linux Wireless <ilw@linux.intel.com>
  26  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  27  *
  28  *****************************************************************************/
  29
  30 #include <linux/kernel.h>
  31 #include <linux/module.h>
  32 #include <linux/init.h>
  33 #include <linux/sched.h>
  34 #include <linux/ieee80211.h>
  35
  36 #include "iwl-dev.h"
  37 #include "iwl-core.h"
  38 #include "iwl-sta.h"
  39 #include "iwl-io.h"
  40 #include "iwl-helpers.h"
  41 #include "iwl-agn-hw.h"
  42 #include "iwl-agn.h"
  43 #include "iwl-trans.h"
  44
  45 static void iwlagn_tx_cmd_protection(struct iwl_priv *priv,
  46                                      struct ieee80211_tx_info *info,
  47                                      __le16 fc, __le32 *tx_flags)
  48 {
  49         if (info->control.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS ||
  50             info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT ||
  51             info->flags & IEEE80211_TX_CTL_AMPDU)
  52                 *tx_flags |= TX_CMD_FLG_PROT_REQUIRE_MSK;
  53 }
  54
  55 /*
  56  * handle build REPLY_TX command notification.
  57  */
  58 static void iwlagn_tx_cmd_build_basic(struct iwl_priv *priv,
  59                                       struct sk_buff *skb,
  60                                       struct iwl_tx_cmd *tx_cmd,
  61                                       struct ieee80211_tx_info *info,
  62                                       struct ieee80211_hdr *hdr, u8 sta_id)
  63 {
  64         __le16 fc = hdr->frame_control;
  65         __le32 tx_flags = tx_cmd->tx_flags;
  66
  67         tx_cmd->stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
  68
  69         if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
  70                 tx_flags |= TX_CMD_FLG_ACK_MSK;
  71         else
  72                 tx_flags &= ~TX_CMD_FLG_ACK_MSK;
  73
  74         if (ieee80211_is_probe_resp(fc))
  75                 tx_flags |= TX_CMD_FLG_TSF_MSK;
  76         else if (ieee80211_is_back_req(fc))
  77                 tx_flags |= TX_CMD_FLG_ACK_MSK | TX_CMD_FLG_IMM_BA_RSP_MASK;
  78         else if (info->band == IEEE80211_BAND_2GHZ &&
  79                  priv->cfg->bt_params &&
  80                  priv->cfg->bt_params->advanced_bt_coexist &&
  81                  (ieee80211_is_auth(fc) || ieee80211_is_assoc_req(fc) ||
  82                  ieee80211_is_reassoc_req(fc) ||
  83                  skb->protocol == cpu_to_be16(ETH_P_PAE)))
  84                 tx_flags |= TX_CMD_FLG_IGNORE_BT;
  85
  86
  87         tx_cmd->sta_id = sta_id;
  88         if (ieee80211_has_morefrags(fc))
  89                 tx_flags |= TX_CMD_FLG_MORE_FRAG_MSK;
  90
  91         if (ieee80211_is_data_qos(fc)) {
  92                 u8 *qc = ieee80211_get_qos_ctl(hdr);
  93                 tx_cmd->tid_tspec = qc[0] & 0xf;
  94                 tx_flags &= ~TX_CMD_FLG_SEQ_CTL_MSK;
  95         } else {
  96                 tx_flags |= TX_CMD_FLG_SEQ_CTL_MSK;
  97         }
  98
  99         iwlagn_tx_cmd_protection(priv, info, fc, &tx_flags);
 100
 101         tx_flags &= ~(TX_CMD_FLG_ANT_SEL_MSK);
 102         if (ieee80211_is_mgmt(fc)) {
 103                 if (ieee80211_is_assoc_req(fc) || ieee80211_is_reassoc_req(fc))
 104                         tx_cmd->timeout.pm_frame_timeout = cpu_to_le16(3);
 105                 else
 106                         tx_cmd->timeout.pm_frame_timeout = cpu_to_le16(2);
 107         } else {
 108                 tx_cmd->timeout.pm_frame_timeout = 0;
 109         }
 110
 111         tx_cmd->driver_txop = 0;
 112         tx_cmd->tx_flags = tx_flags;
 113         tx_cmd->next_frame_len = 0;
 114 }
 115
 116 #define RTS_DFAULT_RETRY_LIMIT          60
 117
 118 static void iwlagn_tx_cmd_build_rate(struct iwl_priv *priv,
 119                                      struct iwl_tx_cmd *tx_cmd,
 120                                      struct ieee80211_tx_info *info,
 121                                      __le16 fc)
 122 {
 123         u32 rate_flags;
 124         int rate_idx;
 125         u8 rts_retry_limit;
 126         u8 data_retry_limit;
 127         u8 rate_plcp;
 128
 129         /* Set retry limit on DATA packets and Probe Responses*/
 130         if (ieee80211_is_probe_resp(fc))
 131                 data_retry_limit = 3;
 132         else
 133                 data_retry_limit = IWLAGN_DEFAULT_TX_RETRY;
 134         tx_cmd->data_retry_limit = data_retry_limit;
 135
 136         /* Set retry limit on RTS packets */
 137         rts_retry_limit = RTS_DFAULT_RETRY_LIMIT;
 138         if (data_retry_limit < rts_retry_limit)
 139                 rts_retry_limit = data_retry_limit;
 140         tx_cmd->rts_retry_limit = rts_retry_limit;
 141
 142         /* DATA packets will use the uCode station table for rate/antenna
 143          * selection */
 144         if (ieee80211_is_data(fc)) {
 145                 tx_cmd->initial_rate_index = 0;
 146                 tx_cmd->tx_flags |= TX_CMD_FLG_STA_RATE_MSK;
 147 #ifdef CONFIG_IWLWIFI_DEVICE_SVTOOL
 148                 if (priv->tm_fixed_rate) {
 149                         /*
 150                          * rate overwrite by testmode
 151                          * we not only send lq command to change rate
 152                          * we also re-enforce per data pkt base.
 153                          */
 154                         tx_cmd->tx_flags &= ~TX_CMD_FLG_STA_RATE_MSK;
 155                         memcpy(&tx_cmd->rate_n_flags, &priv->tm_fixed_rate,
 156                                sizeof(tx_cmd->rate_n_flags));
 157                 }
 158 #endif
 159                 return;
 160         }
 161
 162         /**
 163          * If the current TX rate stored in mac80211 has the MCS bit set, it's
 164          * not really a TX rate.  Thus, we use the lowest supported rate for
 165          * this band.  Also use the lowest supported rate if the stored rate
 166          * index is invalid.
 167          */
 168         rate_idx = info->control.rates[0].idx;
 169         if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS ||
 170                         (rate_idx < 0) || (rate_idx > IWL_RATE_COUNT_LEGACY))
 171                 rate_idx = rate_lowest_index(&priv->bands[info->band],
 172                                 info->control.sta);
 173         /* For 5 GHZ band, remap mac80211 rate indices into driver indices */
 174         if (info->band == IEEE80211_BAND_5GHZ)
 175                 rate_idx += IWL_FIRST_OFDM_RATE;
 176         /* Get PLCP rate for tx_cmd->rate_n_flags */
 177         rate_plcp = iwl_rates[rate_idx].plcp;
 178         /* Zero out flags for this packet */
 179         rate_flags = 0;
 180
 181         /* Set CCK flag as needed */
 182         if ((rate_idx >= IWL_FIRST_CCK_RATE) && (rate_idx <= IWL_LAST_CCK_RATE))
 183                 rate_flags |= RATE_MCS_CCK_MSK;
 184
 185         /* Set up antennas */
 186          if (priv->cfg->bt_params &&
 187              priv->cfg->bt_params->advanced_bt_coexist &&
 188              priv->bt_full_concurrent) {
 189                 /* operated as 1x1 in full concurrency mode */
 190                 priv->mgmt_tx_ant = iwl_toggle_tx_ant(priv, priv->mgmt_tx_ant,
 191                                 first_antenna(hw_params(priv).valid_tx_ant));
 192         } else
 193                 priv->mgmt_tx_ant = iwl_toggle_tx_ant(priv, priv->mgmt_tx_ant,
 194                                                 hw_params(priv).valid_tx_ant);
 195         rate_flags |= iwl_ant_idx_to_flags(priv->mgmt_tx_ant);
 196
 197         /* Set the rate in the TX cmd */
 198         tx_cmd->rate_n_flags = iwl_hw_set_rate_n_flags(rate_plcp, rate_flags);
 199 }
 200
 201 static void iwlagn_tx_cmd_build_hwcrypto(struct iwl_priv *priv,
 202                                       struct ieee80211_tx_info *info,
 203                                       struct iwl_tx_cmd *tx_cmd,
 204                                       struct sk_buff *skb_frag,
 205                                       int sta_id)
 206 {
 207         struct ieee80211_key_conf *keyconf = info->control.hw_key;
 208
 209         switch (keyconf->cipher) {
 210         case WLAN_CIPHER_SUITE_CCMP:
 211                 tx_cmd->sec_ctl = TX_CMD_SEC_CCM;
 212                 memcpy(tx_cmd->key, keyconf->key, keyconf->keylen);
 213                 if (info->flags & IEEE80211_TX_CTL_AMPDU)
 214                         tx_cmd->tx_flags |= TX_CMD_FLG_AGG_CCMP_MSK;
 215                 IWL_DEBUG_TX(priv, "tx_cmd with AES hwcrypto\n");
 216                 break;
 217
 218         case WLAN_CIPHER_SUITE_TKIP:
 219                 tx_cmd->sec_ctl = TX_CMD_SEC_TKIP;
 220                 ieee80211_get_tkip_p2k(keyconf, skb_frag, tx_cmd->key);
 221                 IWL_DEBUG_TX(priv, "tx_cmd with tkip hwcrypto\n");
 222                 break;
 223
 224         case WLAN_CIPHER_SUITE_WEP104:
 225                 tx_cmd->sec_ctl |= TX_CMD_SEC_KEY128;
 226                 /* fall through */
 227         case WLAN_CIPHER_SUITE_WEP40:
 228                 tx_cmd->sec_ctl |= (TX_CMD_SEC_WEP |
 229                         (keyconf->keyidx & TX_CMD_SEC_MSK) << TX_CMD_SEC_SHIFT);
 230
 231                 memcpy(&tx_cmd->key[3], keyconf->key, keyconf->keylen);
 232
 233                 IWL_DEBUG_TX(priv, "Configuring packet for WEP encryption "
 234                              "with key %d\n", keyconf->keyidx);
 235                 break;
 236
 237         default:
 238                 IWL_ERR(priv, "Unknown encode cipher %x\n", keyconf->cipher);
 239                 break;
 240         }
 241 }
 242
 243 /*
 244  * start REPLY_TX command process
 245  */
 246 int iwlagn_tx_skb(struct iwl_priv *priv, struct sk_buff *skb)
 247 {
 248         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 249         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 250         struct iwl_station_priv *sta_priv = NULL;
 251         struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
 252         struct iwl_device_cmd *dev_cmd = NULL;
 253         struct iwl_tx_cmd *tx_cmd;
 254
 255         __le16 fc;
 256         u8 hdr_len;
 257         u16 len;
 258         u8 sta_id;
 259         unsigned long flags;
 260         bool is_agg = false;
 261
 262         if (info->control.vif)
 263                 ctx = iwl_rxon_ctx_from_vif(info->control.vif);
 264
 265         spin_lock_irqsave(&priv->shrd->lock, flags);
 266         if (iwl_is_rfkill(priv->shrd)) {
 267                 IWL_DEBUG_DROP(priv, "Dropping - RF KILL\n");
 268                 goto drop_unlock_priv;
 269         }
 270
 271         fc = hdr->frame_control;
 272
 273 #ifdef CONFIG_IWLWIFI_DEBUG
 274         if (ieee80211_is_auth(fc))
 275                 IWL_DEBUG_TX(priv, "Sending AUTH frame\n");
 276         else if (ieee80211_is_assoc_req(fc))
 277                 IWL_DEBUG_TX(priv, "Sending ASSOC frame\n");
 278         else if (ieee80211_is_reassoc_req(fc))
 279                 IWL_DEBUG_TX(priv, "Sending REASSOC frame\n");
 280 #endif
 281
 282         hdr_len = ieee80211_hdrlen(fc);
 283
 284         /* For management frames use broadcast id to do not break aggregation */
 285         if (!ieee80211_is_data(fc))
 286                 sta_id = ctx->bcast_sta_id;
 287         else {
 288                 /* Find index into station table for destination station */
 289                 sta_id = iwl_sta_id_or_broadcast(priv, ctx, info->control.sta);
 290                 if (sta_id == IWL_INVALID_STATION) {
 291                         IWL_DEBUG_DROP(priv, "Dropping - INVALID STATION: %pM\n",
 292                                        hdr->addr1);
 293                         goto drop_unlock_priv;
 294                 }
 295         }
 296
 297         IWL_DEBUG_TX(priv, "station Id %d\n", sta_id);
 298
 299         if (info->control.sta)
 300                 sta_priv = (void *)info->control.sta->drv_priv;
 301
 302         if (sta_priv && sta_priv->asleep &&
 303             (info->flags & IEEE80211_TX_CTL_PSPOLL_RESPONSE)) {
 304                 /*
 305                  * This sends an asynchronous command to the device,
 306                  * but we can rely on it being processed before the
 307                  * next frame is processed -- and the next frame to
 308                  * this station is the one that will consume this
 309                  * counter.
 310                  * For now set the counter to just 1 since we do not
 311                  * support uAPSD yet.
 312                  */
 313                 iwl_sta_modify_sleep_tx_count(priv, sta_id, 1);
 314         }
 315
 316         /* irqs already disabled/saved above when locking priv->shrd->lock */
 317         spin_lock(&priv->shrd->sta_lock);
 318
 319         dev_cmd = kmem_cache_alloc(priv->tx_cmd_pool, GFP_ATOMIC);
 320
 321         if (unlikely(!dev_cmd))
 322                 goto drop_unlock_sta;
 323
 324         memset(dev_cmd, 0, sizeof(*dev_cmd));
 325         tx_cmd = &dev_cmd->cmd.tx;
 326
 327         /* Copy MAC header from skb into command buffer */
 328         memcpy(tx_cmd->hdr, hdr, hdr_len);
 329
 330         /* Total # bytes to be transmitted */
 331         len = (u16)skb->len;
 332         tx_cmd->len = cpu_to_le16(len);
 333
 334         if (info->control.hw_key)
 335                 iwlagn_tx_cmd_build_hwcrypto(priv, info, tx_cmd, skb, sta_id);
 336
 337         /* TODO need this for burst mode later on */
 338         iwlagn_tx_cmd_build_basic(priv, skb, tx_cmd, info, hdr, sta_id);
 339         iwl_dbg_log_tx_data_frame(priv, len, hdr);
 340
 341         iwlagn_tx_cmd_build_rate(priv, tx_cmd, info, fc);
 342
 343         iwl_update_stats(priv, true, fc, len);
 344
 345         info->driver_data[0] = ctx;
 346         info->driver_data[1] = dev_cmd;
 347
 348         if (iwl_trans_tx(trans(priv), skb, dev_cmd, ctx->ctxid, sta_id))
 349                 goto drop_unlock_sta;
 350
 351         spin_unlock(&priv->shrd->sta_lock);
 352         spin_unlock_irqrestore(&priv->shrd->lock, flags);
 353
 354         /*
 355          * Avoid atomic ops if it isn't an associated client.
 356          * Also, if this is a packet for aggregation, don't
 357          * increase the counter because the ucode will stop
 358          * aggregation queues when their respective station
 359          * goes to sleep.
 360          */
 361         if (sta_priv && sta_priv->client && !is_agg)
 362                 atomic_inc(&sta_priv->pending_frames);
 363
 364         return 0;
 365
 366 drop_unlock_sta:
 367         if (dev_cmd)
 368                 kmem_cache_free(priv->tx_cmd_pool, dev_cmd);
 369         spin_unlock(&priv->shrd->sta_lock);
 370 drop_unlock_priv:
 371         spin_unlock_irqrestore(&priv->shrd->lock, flags);
 372         return -1;
 373 }
 374
 375 int iwlagn_tx_agg_start(struct iwl_priv *priv, struct ieee80211_vif *vif,
 376                         struct ieee80211_sta *sta, u16 tid, u16 *ssn)
 377 {
 378         struct iwl_vif_priv *vif_priv = (void *)vif->drv_priv;
 379         int sta_id;
 380         int ret;
 381
 382         IWL_DEBUG_HT(priv, "TX AGG request on ra = %pM tid = %d\n",
 383                      sta->addr, tid);
 384
 385         sta_id = iwl_sta_id(sta);
 386         if (sta_id == IWL_INVALID_STATION) {
 387                 IWL_ERR(priv, "Start AGG on invalid station\n");
 388                 return -ENXIO;
 389         }
 390         if (unlikely(tid >= IWL_MAX_TID_COUNT))
 391                 return -EINVAL;
 392
 393         if (priv->shrd->tid_data[sta_id][tid].agg.state != IWL_AGG_OFF) {
 394                 IWL_ERR(priv, "Start AGG when state is not IWL_AGG_OFF !\n");
 395                 return -ENXIO;
 396         }
 397
 398         ret = iwl_sta_tx_modify_enable_tid(priv, sta_id, tid);
 399         if (ret)
 400                 return ret;
 401
 402         ret = iwl_trans_tx_agg_alloc(trans(priv), vif_priv->ctx->ctxid, sta_id,
 403                                      tid, ssn);
 404
 405         return ret;
 406 }
 407
 408 int iwlagn_tx_agg_stop(struct iwl_priv *priv, struct ieee80211_vif *vif,
 409                        struct ieee80211_sta *sta, u16 tid)
 410 {
 411         int sta_id;
 412         struct iwl_vif_priv *vif_priv = (void *)vif->drv_priv;
 413
 414         sta_id = iwl_sta_id(sta);
 415
 416         if (sta_id == IWL_INVALID_STATION) {
 417                 IWL_ERR(priv, "Invalid station for AGG tid %d\n", tid);
 418                 return -ENXIO;
 419         }
 420
 421         return iwl_trans_tx_agg_disable(trans(priv), vif_priv->ctx->ctxid,
 422                                         sta_id, tid);
 423 }
 424
 425 static void iwlagn_non_agg_tx_status(struct iwl_priv *priv,
 426                                      struct iwl_rxon_context *ctx,
 427                                      const u8 *addr1)
 428 {
 429         struct ieee80211_sta *sta;
 430         struct iwl_station_priv *sta_priv;
 431
 432         rcu_read_lock();
 433         sta = ieee80211_find_sta(ctx->vif, addr1);
 434         if (sta) {
 435                 sta_priv = (void *)sta->drv_priv;
 436                 /* avoid atomic ops if this isn't a client */
 437                 if (sta_priv->client &&
 438                     atomic_dec_return(&sta_priv->pending_frames) == 0)
 439                         ieee80211_sta_block_awake(priv->hw, sta, false);
 440         }
 441         rcu_read_unlock();
 442 }
 443
 444 /**
 445  * translate ucode response to mac80211 tx status control values
 446  */
 447 static void iwlagn_hwrate_to_tx_control(struct iwl_priv *priv, u32 rate_n_flags,
 448                                   struct ieee80211_tx_info *info)
 449 {
 450         struct ieee80211_tx_rate *r = &info->control.rates[0];
 451
 452         info->antenna_sel_tx =
 453                 ((rate_n_flags & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS);
 454         if (rate_n_flags & RATE_MCS_HT_MSK)
 455                 r->flags |= IEEE80211_TX_RC_MCS;
 456         if (rate_n_flags & RATE_MCS_GF_MSK)
 457                 r->flags |= IEEE80211_TX_RC_GREEN_FIELD;
 458         if (rate_n_flags & RATE_MCS_HT40_MSK)
 459                 r->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
 460         if (rate_n_flags & RATE_MCS_DUP_MSK)
 461                 r->flags |= IEEE80211_TX_RC_DUP_DATA;
 462         if (rate_n_flags & RATE_MCS_SGI_MSK)
 463                 r->flags |= IEEE80211_TX_RC_SHORT_GI;
 464         r->idx = iwlagn_hwrate_to_mac80211_idx(rate_n_flags, info->band);
 465 }
 466
 467 #ifdef CONFIG_IWLWIFI_DEBUG
 468 const char *iwl_get_tx_fail_reason(u32 status)
 469 {
 470 #define TX_STATUS_FAIL(x) case TX_STATUS_FAIL_ ## x: return #x
 471 #define TX_STATUS_POSTPONE(x) case TX_STATUS_POSTPONE_ ## x: return #x
 472
 473         switch (status & TX_STATUS_MSK) {
 474         case TX_STATUS_SUCCESS:
 475                 return "SUCCESS";
 476         TX_STATUS_POSTPONE(DELAY);
 477         TX_STATUS_POSTPONE(FEW_BYTES);
 478         TX_STATUS_POSTPONE(BT_PRIO);
 479         TX_STATUS_POSTPONE(QUIET_PERIOD);
 480         TX_STATUS_POSTPONE(CALC_TTAK);
 481         TX_STATUS_FAIL(INTERNAL_CROSSED_RETRY);
 482         TX_STATUS_FAIL(SHORT_LIMIT);
 483         TX_STATUS_FAIL(LONG_LIMIT);
 484         TX_STATUS_FAIL(FIFO_UNDERRUN);
 485         TX_STATUS_FAIL(DRAIN_FLOW);
 486         TX_STATUS_FAIL(RFKILL_FLUSH);
 487         TX_STATUS_FAIL(LIFE_EXPIRE);
 488         TX_STATUS_FAIL(DEST_PS);
 489         TX_STATUS_FAIL(HOST_ABORTED);
 490         TX_STATUS_FAIL(BT_RETRY);
 491         TX_STATUS_FAIL(STA_INVALID);
 492         TX_STATUS_FAIL(FRAG_DROPPED);
 493         TX_STATUS_FAIL(TID_DISABLE);
 494         TX_STATUS_FAIL(FIFO_FLUSHED);
 495         TX_STATUS_FAIL(INSUFFICIENT_CF_POLL);
 496         TX_STATUS_FAIL(PASSIVE_NO_RX);
 497         TX_STATUS_FAIL(NO_BEACON_ON_RADAR);
 498         }
 499
 500         return "UNKNOWN";
 501
 502 #undef TX_STATUS_FAIL
 503 #undef TX_STATUS_POSTPONE
 504 }
 505 #endif /* CONFIG_IWLWIFI_DEBUG */
 506
 507 static void iwlagn_count_agg_tx_err_status(struct iwl_priv *priv, u16 status)
 508 {
 509         status &= AGG_TX_STATUS_MSK;
 510
 511         switch (status) {
 512         case AGG_TX_STATE_UNDERRUN_MSK:
 513                 priv->reply_agg_tx_stats.underrun++;
 514                 break;
 515         case AGG_TX_STATE_BT_PRIO_MSK:
 516                 priv->reply_agg_tx_stats.bt_prio++;
 517                 break;
 518         case AGG_TX_STATE_FEW_BYTES_MSK:
 519                 priv->reply_agg_tx_stats.few_bytes++;
 520                 break;
 521         case AGG_TX_STATE_ABORT_MSK:
 522                 priv->reply_agg_tx_stats.abort++;
 523                 break;
 524         case AGG_TX_STATE_LAST_SENT_TTL_MSK:
 525                 priv->reply_agg_tx_stats.last_sent_ttl++;
 526                 break;
 527         case AGG_TX_STATE_LAST_SENT_TRY_CNT_MSK:
 528                 priv->reply_agg_tx_stats.last_sent_try++;
 529                 break;
 530         case AGG_TX_STATE_LAST_SENT_BT_KILL_MSK:
 531                 priv->reply_agg_tx_stats.last_sent_bt_kill++;
 532                 break;
 533         case AGG_TX_STATE_SCD_QUERY_MSK:
 534                 priv->reply_agg_tx_stats.scd_query++;
 535                 break;
 536         case AGG_TX_STATE_TEST_BAD_CRC32_MSK:
 537                 priv->reply_agg_tx_stats.bad_crc32++;
 538                 break;
 539         case AGG_TX_STATE_RESPONSE_MSK:
 540                 priv->reply_agg_tx_stats.response++;
 541                 break;
 542         case AGG_TX_STATE_DUMP_TX_MSK:
 543                 priv->reply_agg_tx_stats.dump_tx++;
 544                 break;
 545         case AGG_TX_STATE_DELAY_TX_MSK:
 546                 priv->reply_agg_tx_stats.delay_tx++;
 547                 break;
 548         default:
 549                 priv->reply_agg_tx_stats.unknown++;
 550                 break;
 551         }
 552 }
 553
 554 static void iwl_rx_reply_tx_agg(struct iwl_priv *priv,
 555                                 struct iwlagn_tx_resp *tx_resp)
 556 {
 557         struct agg_tx_status *frame_status = &tx_resp->status;
 558         int tid = (tx_resp->ra_tid & IWLAGN_TX_RES_TID_MSK) >>
 559                 IWLAGN_TX_RES_TID_POS;
 560         int sta_id = (tx_resp->ra_tid & IWLAGN_TX_RES_RA_MSK) >>
 561                 IWLAGN_TX_RES_RA_POS;
 562         struct iwl_ht_agg *agg = &priv->shrd->tid_data[sta_id][tid].agg;
 563         u32 status = le16_to_cpu(tx_resp->status.status);
 564         int i;
 565
 566         if (agg->wait_for_ba)
 567                 IWL_DEBUG_TX_REPLY(priv,
 568                         "got tx response w/o block-ack\n");
 569
 570         agg->rate_n_flags = le32_to_cpu(tx_resp->rate_n_flags);
 571         agg->wait_for_ba = (tx_resp->frame_count > 1);
 572
 573         /*
 574          * If the BT kill count is non-zero, we'll get this
 575          * notification again.
 576          */
 577         if (tx_resp->bt_kill_count && tx_resp->frame_count == 1 &&
 578             priv->cfg->bt_params &&
 579             priv->cfg->bt_params->advanced_bt_coexist) {
 580                 IWL_DEBUG_COEX(priv, "receive reply tx w/ bt_kill\n");
 581         }
 582
 583         /* Construct bit-map of pending frames within Tx window */
 584         for (i = 0; i < tx_resp->frame_count; i++) {
 585                 u16 fstatus = le16_to_cpu(frame_status[i].status);
 586
 587                 if (status & AGG_TX_STATUS_MSK)
 588                         iwlagn_count_agg_tx_err_status(priv, fstatus);
 589
 590                 if (status & (AGG_TX_STATE_FEW_BYTES_MSK |
 591                               AGG_TX_STATE_ABORT_MSK))
 592                         continue;
 593
 594                 IWL_DEBUG_TX_REPLY(priv, "status %s (0x%08x), "
 595                                    "try-count (0x%08x)\n",
 596                                    iwl_get_agg_tx_fail_reason(fstatus),
 597                                    fstatus & AGG_TX_STATUS_MSK,
 598                                    fstatus & AGG_TX_TRY_MSK);
 599         }
 600 }
 601
 602 #ifdef CONFIG_IWLWIFI_DEBUG
 603 #define AGG_TX_STATE_FAIL(x) case AGG_TX_STATE_ ## x: return #x
 604
 605 const char *iwl_get_agg_tx_fail_reason(u16 status)
 606 {
 607         status &= AGG_TX_STATUS_MSK;
 608         switch (status) {
 609         case AGG_TX_STATE_TRANSMITTED:
 610                 return "SUCCESS";
 611                 AGG_TX_STATE_FAIL(UNDERRUN_MSK);
 612                 AGG_TX_STATE_FAIL(BT_PRIO_MSK);
 613                 AGG_TX_STATE_FAIL(FEW_BYTES_MSK);
 614                 AGG_TX_STATE_FAIL(ABORT_MSK);
 615                 AGG_TX_STATE_FAIL(LAST_SENT_TTL_MSK);
 616                 AGG_TX_STATE_FAIL(LAST_SENT_TRY_CNT_MSK);
 617                 AGG_TX_STATE_FAIL(LAST_SENT_BT_KILL_MSK);
 618                 AGG_TX_STATE_FAIL(SCD_QUERY_MSK);
 619                 AGG_TX_STATE_FAIL(TEST_BAD_CRC32_MSK);
 620                 AGG_TX_STATE_FAIL(RESPONSE_MSK);
 621                 AGG_TX_STATE_FAIL(DUMP_TX_MSK);
 622                 AGG_TX_STATE_FAIL(DELAY_TX_MSK);
 623         }
 624
 625         return "UNKNOWN";
 626 }
 627 #endif /* CONFIG_IWLWIFI_DEBUG */
 628
 629 static inline u32 iwlagn_get_scd_ssn(struct iwlagn_tx_resp *tx_resp)
 630 {
 631         return le32_to_cpup((__le32 *)&tx_resp->status +
 632                             tx_resp->frame_count) & MAX_SN;
 633 }
 634
 635 static void iwlagn_count_tx_err_status(struct iwl_priv *priv, u16 status)
 636 {
 637         status &= TX_STATUS_MSK;
 638
 639         switch (status) {
 640         case TX_STATUS_POSTPONE_DELAY:
 641                 priv->reply_tx_stats.pp_delay++;
 642                 break;
 643         case TX_STATUS_POSTPONE_FEW_BYTES:
 644                 priv->reply_tx_stats.pp_few_bytes++;
 645                 break;
 646         case TX_STATUS_POSTPONE_BT_PRIO:
 647                 priv->reply_tx_stats.pp_bt_prio++;
 648                 break;
 649         case TX_STATUS_POSTPONE_QUIET_PERIOD:
 650                 priv->reply_tx_stats.pp_quiet_period++;
 651                 break;
 652         case TX_STATUS_POSTPONE_CALC_TTAK:
 653                 priv->reply_tx_stats.pp_calc_ttak++;
 654                 break;
 655         case TX_STATUS_FAIL_INTERNAL_CROSSED_RETRY:
 656                 priv->reply_tx_stats.int_crossed_retry++;
 657                 break;
 658         case TX_STATUS_FAIL_SHORT_LIMIT:
 659                 priv->reply_tx_stats.short_limit++;
 660                 break;
 661         case TX_STATUS_FAIL_LONG_LIMIT:
 662                 priv->reply_tx_stats.long_limit++;
 663                 break;
 664         case TX_STATUS_FAIL_FIFO_UNDERRUN:
 665                 priv->reply_tx_stats.fifo_underrun++;
 666                 break;
 667         case TX_STATUS_FAIL_DRAIN_FLOW:
 668                 priv->reply_tx_stats.drain_flow++;
 669                 break;
 670         case TX_STATUS_FAIL_RFKILL_FLUSH:
 671                 priv->reply_tx_stats.rfkill_flush++;
 672                 break;
 673         case TX_STATUS_FAIL_LIFE_EXPIRE:
 674                 priv->reply_tx_stats.life_expire++;
 675                 break;
 676         case TX_STATUS_FAIL_DEST_PS:
 677                 priv->reply_tx_stats.dest_ps++;
 678                 break;
 679         case TX_STATUS_FAIL_HOST_ABORTED:
 680                 priv->reply_tx_stats.host_abort++;
 681                 break;
 682         case TX_STATUS_FAIL_BT_RETRY:
 683                 priv->reply_tx_stats.bt_retry++;
 684                 break;
 685         case TX_STATUS_FAIL_STA_INVALID:
 686                 priv->reply_tx_stats.sta_invalid++;
 687                 break;
 688         case TX_STATUS_FAIL_FRAG_DROPPED:
 689                 priv->reply_tx_stats.frag_drop++;
 690                 break;
 691         case TX_STATUS_FAIL_TID_DISABLE:
 692                 priv->reply_tx_stats.tid_disable++;
 693                 break;
 694         case TX_STATUS_FAIL_FIFO_FLUSHED:
 695                 priv->reply_tx_stats.fifo_flush++;
 696                 break;
 697         case TX_STATUS_FAIL_INSUFFICIENT_CF_POLL:
 698                 priv->reply_tx_stats.insuff_cf_poll++;
 699                 break;
 700         case TX_STATUS_FAIL_PASSIVE_NO_RX:
 701                 priv->reply_tx_stats.fail_hw_drop++;
 702                 break;
 703         case TX_STATUS_FAIL_NO_BEACON_ON_RADAR:
 704                 priv->reply_tx_stats.sta_color_mismatch++;
 705                 break;
 706         default:
 707                 priv->reply_tx_stats.unknown++;
 708                 break;
 709         }
 710 }
 711
 712 static void iwlagn_set_tx_status(struct iwl_priv *priv,
 713                                  struct ieee80211_tx_info *info,
 714                                  struct iwlagn_tx_resp *tx_resp,
 715                                  bool is_agg)
 716 {
 717         u16  status = le16_to_cpu(tx_resp->status.status);
 718
 719         info->status.rates[0].count = tx_resp->failure_frame + 1;
 720         if (is_agg)
 721                 info->flags &= ~IEEE80211_TX_CTL_AMPDU;
 722         info->flags |= iwl_tx_status_to_mac80211(status);
 723         iwlagn_hwrate_to_tx_control(priv, le32_to_cpu(tx_resp->rate_n_flags),
 724                                     info);
 725         if (!iwl_is_tx_success(status))
 726                 iwlagn_count_tx_err_status(priv, status);
 727 }
 728
 729 static void iwl_check_abort_status(struct iwl_priv *priv,
 730                             u8 frame_count, u32 status)
 731 {
 732         if (frame_count == 1 && status == TX_STATUS_FAIL_RFKILL_FLUSH) {
 733                 IWL_ERR(priv, "Tx flush command to flush out all frames\n");
 734                 if (!test_bit(STATUS_EXIT_PENDING, &priv->shrd->status))
 735                         queue_work(priv->shrd->workqueue, &priv->tx_flush);
 736         }
 737 }
 738
 739 void iwlagn_rx_reply_tx(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb)
 740 {
 741         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 742         u16 sequence = le16_to_cpu(pkt->hdr.sequence);
 743         int txq_id = SEQ_TO_QUEUE(sequence);
 744         int cmd_index __maybe_unused = SEQ_TO_INDEX(sequence);
 745         struct iwlagn_tx_resp *tx_resp = (void *)&pkt->u.raw[0];
 746         struct ieee80211_hdr *hdr;
 747         u32 status = le16_to_cpu(tx_resp->status.status);
 748         u32 ssn = iwlagn_get_scd_ssn(tx_resp);
 749         int tid;
 750         int sta_id;
 751         int freed;
 752         struct ieee80211_tx_info *info;
 753         unsigned long flags;
 754         struct sk_buff_head skbs;
 755         struct sk_buff *skb;
 756         struct iwl_rxon_context *ctx;
 757         bool is_agg = (txq_id >= IWLAGN_FIRST_AMPDU_QUEUE);
 758
 759         tid = (tx_resp->ra_tid & IWLAGN_TX_RES_TID_MSK) >>
 760                 IWLAGN_TX_RES_TID_POS;
 761         sta_id = (tx_resp->ra_tid & IWLAGN_TX_RES_RA_MSK) >>
 762                 IWLAGN_TX_RES_RA_POS;
 763
 764         spin_lock_irqsave(&priv->shrd->sta_lock, flags);
 765
 766         if (is_agg)
 767                 iwl_rx_reply_tx_agg(priv, tx_resp);
 768
 769         if (tx_resp->frame_count == 1) {
 770                 __skb_queue_head_init(&skbs);
 771                 /*we can free until ssn % q.n_bd not inclusive */
 772                 iwl_trans_reclaim(trans(priv), sta_id, tid, txq_id,
 773                                   ssn, status, &skbs);
 774                 freed = 0;
 775                 while (!skb_queue_empty(&skbs)) {
 776                         skb = __skb_dequeue(&skbs);
 777                         hdr = (struct ieee80211_hdr *)skb->data;
 778
 779                         if (!ieee80211_is_data_qos(hdr->frame_control))
 780                                 priv->last_seq_ctl = tx_resp->seq_ctl;
 781
 782                         info = IEEE80211_SKB_CB(skb);
 783                         ctx = info->driver_data[0];
 784                         kmem_cache_free(priv->tx_cmd_pool,
 785                                         (info->driver_data[1]));
 786
 787                         memset(&info->status, 0, sizeof(info->status));
 788
 789                         if (status == TX_STATUS_FAIL_PASSIVE_NO_RX &&
 790                             iwl_is_associated_ctx(ctx) && ctx->vif &&
 791                             ctx->vif->type == NL80211_IFTYPE_STATION) {
 792                                 ctx->last_tx_rejected = true;
 793                                 iwl_trans_stop_queue(trans(priv), txq_id);
 794
 795                                 IWL_DEBUG_TX_REPLY(priv,
 796                                            "TXQ %d status %s (0x%08x) "
 797                                            "rate_n_flags 0x%x retries %d\n",
 798                                            txq_id,
 799                                            iwl_get_tx_fail_reason(status),
 800                                            status,
 801                                            le32_to_cpu(tx_resp->rate_n_flags),
 802                                            tx_resp->failure_frame);
 803
 804                                 IWL_DEBUG_TX_REPLY(priv,
 805                                            "FrameCnt = %d, idx=%d\n",
 806                                            tx_resp->frame_count, cmd_index);
 807                         }
 808
 809                         /* check if BAR is needed */
 810                         if (is_agg && !iwl_is_tx_success(status))
 811                                 info->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK;
 812                         iwlagn_set_tx_status(priv, IEEE80211_SKB_CB(skb),
 813                                      tx_resp, is_agg);
 814                         if (!is_agg)
 815                                 iwlagn_non_agg_tx_status(priv, ctx, hdr->addr1);
 816
 817                         ieee80211_tx_status_irqsafe(priv->hw, skb);
 818
 819                         freed++;
 820                 }
 821
 822                 WARN_ON(!is_agg && freed != 1);
 823         }
 824
 825         iwl_check_abort_status(priv, tx_resp->frame_count, status);
 826         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
 827 }
 828
 829 /**
 830  * iwlagn_rx_reply_compressed_ba - Handler for REPLY_COMPRESSED_BA
 831  *
 832  * Handles block-acknowledge notification from device, which reports success
 833  * of frames sent via aggregation.
 834  */
 835 void iwlagn_rx_reply_compressed_ba(struct iwl_priv *priv,
 836                                            struct iwl_rx_mem_buffer *rxb)
 837 {
 838         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 839         struct iwl_compressed_ba_resp *ba_resp = &pkt->u.compressed_ba;
 840         struct iwl_ht_agg *agg;
 841         struct sk_buff_head reclaimed_skbs;
 842         struct ieee80211_tx_info *info;
 843         struct ieee80211_hdr *hdr;
 844         struct sk_buff *skb;
 845         unsigned long flags;
 846         int sta_id;
 847         int tid;
 848         int freed;
 849
 850         /* "flow" corresponds to Tx queue */
 851         u16 scd_flow = le16_to_cpu(ba_resp->scd_flow);
 852
 853         /* "ssn" is start of block-ack Tx window, corresponds to index
 854          * (in Tx queue's circular buffer) of first TFD/frame in window */
 855         u16 ba_resp_scd_ssn = le16_to_cpu(ba_resp->scd_ssn);
 856
 857         if (scd_flow >= hw_params(priv).max_txq_num) {
 858                 IWL_ERR(priv,
 859                         "BUG_ON scd_flow is bigger than number of queues\n");
 860                 return;
 861         }
 862
 863         sta_id = ba_resp->sta_id;
 864         tid = ba_resp->tid;
 865         agg = &priv->shrd->tid_data[sta_id][tid].agg;
 866
 867         spin_lock_irqsave(&priv->shrd->sta_lock, flags);
 868
 869         if (unlikely(agg->txq_id != scd_flow)) {
 870                 /*
 871                  * FIXME: this is a uCode bug which need to be addressed,
 872                  * log the information and return for now!
 873                  * since it is possible happen very often and in order
 874                  * not to fill the syslog, don't enable the logging by default
 875                  */
 876                 IWL_DEBUG_TX_REPLY(priv,
 877                         "BA scd_flow %d does not match txq_id %d\n",
 878                         scd_flow, agg->txq_id);
 879                 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
 880                 return;
 881         }
 882
 883         if (unlikely(!agg->wait_for_ba)) {
 884                 if (unlikely(ba_resp->bitmap))
 885                         IWL_ERR(priv, "Received BA when not expected\n");
 886                 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
 887                 return;
 888         }
 889
 890         IWL_DEBUG_TX_REPLY(priv, "REPLY_COMPRESSED_BA [%d] Received from %pM, "
 891                            "sta_id = %d\n",
 892                            agg->wait_for_ba,
 893                            (u8 *) &ba_resp->sta_addr_lo32,
 894                            ba_resp->sta_id);
 895         IWL_DEBUG_TX_REPLY(priv, "TID = %d, SeqCtl = %d, bitmap = 0x%llx, "
 896                            "scd_flow = %d, scd_ssn = %d\n",
 897                            ba_resp->tid,
 898                            ba_resp->seq_ctl,
 899                            (unsigned long long)le64_to_cpu(ba_resp->bitmap),
 900                            ba_resp->scd_flow,
 901                            ba_resp->scd_ssn);
 902
 903         /* Mark that the expected block-ack response arrived */
 904         agg->wait_for_ba = false;
 905
 906         /* Sanity check values reported by uCode */
 907         if (ba_resp->txed_2_done > ba_resp->txed) {
 908                 IWL_DEBUG_TX_REPLY(priv,
 909                         "bogus sent(%d) and ack(%d) count\n",
 910                         ba_resp->txed, ba_resp->txed_2_done);
 911                 /*
 912                  * set txed_2_done = txed,
 913                  * so it won't impact rate scale
 914                  */
 915                 ba_resp->txed = ba_resp->txed_2_done;
 916         }
 917         IWL_DEBUG_HT(priv, "agg frames sent:%d, acked:%d\n",
 918                         ba_resp->txed, ba_resp->txed_2_done);
 919
 920         __skb_queue_head_init(&reclaimed_skbs);
 921
 922         /* Release all TFDs before the SSN, i.e. all TFDs in front of
 923          * block-ack window (we assume that they've been successfully
 924          * transmitted ... if not, it's too late anyway). */
 925         iwl_trans_reclaim(trans(priv), sta_id, tid, scd_flow, ba_resp_scd_ssn,
 926                           0, &reclaimed_skbs);
 927         freed = 0;
 928         while (!skb_queue_empty(&reclaimed_skbs)) {
 929
 930                 skb = __skb_dequeue(&reclaimed_skbs);
 931                 hdr = (struct ieee80211_hdr *)skb->data;
 932
 933                 if (ieee80211_is_data_qos(hdr->frame_control))
 934                         freed++;
 935                 else
 936                         WARN_ON_ONCE(1);
 937
 938                 if (freed == 0) {
 939                         /* this is the first skb we deliver in this batch */
 940                         /* put the rate scaling data there */
 941                         info = IEEE80211_SKB_CB(skb);
 942                         memset(&info->status, 0, sizeof(info->status));
 943                         info->flags |= IEEE80211_TX_STAT_ACK;
 944                         info->flags |= IEEE80211_TX_STAT_AMPDU;
 945                         info->status.ampdu_ack_len = ba_resp->txed_2_done;
 946                         info->status.ampdu_len = ba_resp->txed;
 947                         iwlagn_hwrate_to_tx_control(priv, agg->rate_n_flags,
 948                                                     info);
 949                 }
 950
 951                 info = IEEE80211_SKB_CB(skb);
 952                 kmem_cache_free(priv->tx_cmd_pool, (info->driver_data[1]));
 953
 954                 ieee80211_tx_status_irqsafe(priv->hw, skb);
 955         }
 956
 957         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
 958 }