drivers/net/wireless/iwlwifi/dvm/tx.c

   1 /******************************************************************************
   2  *
   3  * GPL LICENSE SUMMARY
   4  *
   5  * Copyright(c) 2008 - 2013 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 COPYING.
  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 #include "iwl-io.h"
  36 #include "iwl-trans.h"
  37 #include "iwl-agn-hw.h"
  38 #include "dev.h"
  39 #include "agn.h"
  40
  41 static const u8 tid_to_ac[] = {
  42         IEEE80211_AC_BE,
  43         IEEE80211_AC_BK,
  44         IEEE80211_AC_BK,
  45         IEEE80211_AC_BE,
  46         IEEE80211_AC_VI,
  47         IEEE80211_AC_VI,
  48         IEEE80211_AC_VO,
  49         IEEE80211_AC_VO,
  50 };
  51
  52 static void iwlagn_tx_cmd_protection(struct iwl_priv *priv,
  53                                      struct ieee80211_tx_info *info,
  54                                      __le16 fc, __le32 *tx_flags)
  55 {
  56         if (info->control.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS ||
  57             info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT ||
  58             info->flags & IEEE80211_TX_CTL_AMPDU)
  59                 *tx_flags |= TX_CMD_FLG_PROT_REQUIRE_MSK;
  60 }
  61
  62 /*
  63  * handle build REPLY_TX command notification.
  64  */
  65 static void iwlagn_tx_cmd_build_basic(struct iwl_priv *priv,
  66                                       struct sk_buff *skb,
  67                                       struct iwl_tx_cmd *tx_cmd,
  68                                       struct ieee80211_tx_info *info,
  69                                       struct ieee80211_hdr *hdr, u8 sta_id)
  70 {
  71         __le16 fc = hdr->frame_control;
  72         __le32 tx_flags = tx_cmd->tx_flags;
  73
  74         tx_cmd->stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
  75
  76         if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
  77                 tx_flags |= TX_CMD_FLG_ACK_MSK;
  78         else
  79                 tx_flags &= ~TX_CMD_FLG_ACK_MSK;
  80
  81         if (ieee80211_is_probe_resp(fc))
  82                 tx_flags |= TX_CMD_FLG_TSF_MSK;
  83         else if (ieee80211_is_back_req(fc))
  84                 tx_flags |= TX_CMD_FLG_ACK_MSK | TX_CMD_FLG_IMM_BA_RSP_MASK;
  85         else if (info->band == IEEE80211_BAND_2GHZ &&
  86                  priv->lib->bt_params &&
  87                  priv->lib->bt_params->advanced_bt_coexist &&
  88                  (ieee80211_is_auth(fc) || ieee80211_is_assoc_req(fc) ||
  89                  ieee80211_is_reassoc_req(fc) ||
  90                  skb->protocol == cpu_to_be16(ETH_P_PAE)))
  91                 tx_flags |= TX_CMD_FLG_IGNORE_BT;
  92
  93
  94         tx_cmd->sta_id = sta_id;
  95         if (ieee80211_has_morefrags(fc))
  96                 tx_flags |= TX_CMD_FLG_MORE_FRAG_MSK;
  97
  98         if (ieee80211_is_data_qos(fc)) {
  99                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 100                 tx_cmd->tid_tspec = qc[0] & 0xf;
 101                 tx_flags &= ~TX_CMD_FLG_SEQ_CTL_MSK;
 102         } else {
 103                 tx_cmd->tid_tspec = IWL_TID_NON_QOS;
 104                 if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ)
 105                         tx_flags |= TX_CMD_FLG_SEQ_CTL_MSK;
 106                 else
 107                         tx_flags &= ~TX_CMD_FLG_SEQ_CTL_MSK;
 108         }
 109
 110         iwlagn_tx_cmd_protection(priv, info, fc, &tx_flags);
 111
 112         tx_flags &= ~(TX_CMD_FLG_ANT_SEL_MSK);
 113         if (ieee80211_is_mgmt(fc)) {
 114                 if (ieee80211_is_assoc_req(fc) || ieee80211_is_reassoc_req(fc))
 115                         tx_cmd->timeout.pm_frame_timeout = cpu_to_le16(3);
 116                 else
 117                         tx_cmd->timeout.pm_frame_timeout = cpu_to_le16(2);
 118         } else {
 119                 tx_cmd->timeout.pm_frame_timeout = 0;
 120         }
 121
 122         tx_cmd->driver_txop = 0;
 123         tx_cmd->tx_flags = tx_flags;
 124         tx_cmd->next_frame_len = 0;
 125 }
 126
 127 static void iwlagn_tx_cmd_build_rate(struct iwl_priv *priv,
 128                                      struct iwl_tx_cmd *tx_cmd,
 129                                      struct ieee80211_tx_info *info,
 130                                      struct ieee80211_sta *sta,
 131                                      __le16 fc)
 132 {
 133         u32 rate_flags;
 134         int rate_idx;
 135         u8 rts_retry_limit;
 136         u8 data_retry_limit;
 137         u8 rate_plcp;
 138
 139         if (priv->wowlan) {
 140                 rts_retry_limit = IWLAGN_LOW_RETRY_LIMIT;
 141                 data_retry_limit = IWLAGN_LOW_RETRY_LIMIT;
 142         } else {
 143                 /* Set retry limit on RTS packets */
 144                 rts_retry_limit = IWLAGN_RTS_DFAULT_RETRY_LIMIT;
 145
 146                 /* Set retry limit on DATA packets and Probe Responses*/
 147                 if (ieee80211_is_probe_resp(fc)) {
 148                         data_retry_limit = IWLAGN_MGMT_DFAULT_RETRY_LIMIT;
 149                         rts_retry_limit =
 150                                 min(data_retry_limit, rts_retry_limit);
 151                 } else if (ieee80211_is_back_req(fc))
 152                         data_retry_limit = IWLAGN_BAR_DFAULT_RETRY_LIMIT;
 153                 else
 154                         data_retry_limit = IWLAGN_DEFAULT_TX_RETRY;
 155         }
 156
 157         tx_cmd->data_retry_limit = data_retry_limit;
 158         tx_cmd->rts_retry_limit = rts_retry_limit;
 159
 160         /* DATA packets will use the uCode station table for rate/antenna
 161          * selection */
 162         if (ieee80211_is_data(fc)) {
 163                 tx_cmd->initial_rate_index = 0;
 164                 tx_cmd->tx_flags |= TX_CMD_FLG_STA_RATE_MSK;
 165                 return;
 166         } else if (ieee80211_is_back_req(fc))
 167                 tx_cmd->tx_flags |= TX_CMD_FLG_STA_RATE_MSK;
 168
 169         /**
 170          * If the current TX rate stored in mac80211 has the MCS bit set, it's
 171          * not really a TX rate.  Thus, we use the lowest supported rate for
 172          * this band.  Also use the lowest supported rate if the stored rate
 173          * index is invalid.
 174          */
 175         rate_idx = info->control.rates[0].idx;
 176         if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS ||
 177                         (rate_idx < 0) || (rate_idx > IWL_RATE_COUNT_LEGACY))
 178                 rate_idx = rate_lowest_index(
 179                                 &priv->nvm_data->bands[info->band], sta);
 180         /* For 5 GHZ band, remap mac80211 rate indices into driver indices */
 181         if (info->band == IEEE80211_BAND_5GHZ)
 182                 rate_idx += IWL_FIRST_OFDM_RATE;
 183         /* Get PLCP rate for tx_cmd->rate_n_flags */
 184         rate_plcp = iwl_rates[rate_idx].plcp;
 185         /* Zero out flags for this packet */
 186         rate_flags = 0;
 187
 188         /* Set CCK flag as needed */
 189         if ((rate_idx >= IWL_FIRST_CCK_RATE) && (rate_idx <= IWL_LAST_CCK_RATE))
 190                 rate_flags |= RATE_MCS_CCK_MSK;
 191
 192         /* Set up antennas */
 193          if (priv->lib->bt_params &&
 194              priv->lib->bt_params->advanced_bt_coexist &&
 195              priv->bt_full_concurrent) {
 196                 /* operated as 1x1 in full concurrency mode */
 197                 priv->mgmt_tx_ant = iwl_toggle_tx_ant(priv, priv->mgmt_tx_ant,
 198                                 first_antenna(priv->nvm_data->valid_tx_ant));
 199         } else
 200                 priv->mgmt_tx_ant = iwl_toggle_tx_ant(
 201                                         priv, priv->mgmt_tx_ant,
 202                                         priv->nvm_data->valid_tx_ant);
 203         rate_flags |= iwl_ant_idx_to_flags(priv->mgmt_tx_ant);
 204
 205         /* Set the rate in the TX cmd */
 206         tx_cmd->rate_n_flags = iwl_hw_set_rate_n_flags(rate_plcp, rate_flags);
 207 }
 208
 209 static void iwlagn_tx_cmd_build_hwcrypto(struct iwl_priv *priv,
 210                                          struct ieee80211_tx_info *info,
 211                                          struct iwl_tx_cmd *tx_cmd,
 212                                          struct sk_buff *skb_frag)
 213 {
 214         struct ieee80211_key_conf *keyconf = info->control.hw_key;
 215
 216         switch (keyconf->cipher) {
 217         case WLAN_CIPHER_SUITE_CCMP:
 218                 tx_cmd->sec_ctl = TX_CMD_SEC_CCM;
 219                 memcpy(tx_cmd->key, keyconf->key, keyconf->keylen);
 220                 if (info->flags & IEEE80211_TX_CTL_AMPDU)
 221                         tx_cmd->tx_flags |= TX_CMD_FLG_AGG_CCMP_MSK;
 222                 break;
 223
 224         case WLAN_CIPHER_SUITE_TKIP:
 225                 tx_cmd->sec_ctl = TX_CMD_SEC_TKIP;
 226                 ieee80211_get_tkip_p2k(keyconf, skb_frag, tx_cmd->key);
 227                 break;
 228
 229         case WLAN_CIPHER_SUITE_WEP104:
 230                 tx_cmd->sec_ctl |= TX_CMD_SEC_KEY128;
 231                 /* fall through */
 232         case WLAN_CIPHER_SUITE_WEP40:
 233                 tx_cmd->sec_ctl |= (TX_CMD_SEC_WEP |
 234                         (keyconf->keyidx & TX_CMD_SEC_MSK) << TX_CMD_SEC_SHIFT);
 235
 236                 memcpy(&tx_cmd->key[3], keyconf->key, keyconf->keylen);
 237
 238                 IWL_DEBUG_TX(priv, "Configuring packet for WEP encryption "
 239                              "with key %d\n", keyconf->keyidx);
 240                 break;
 241
 242         default:
 243                 IWL_ERR(priv, "Unknown encode cipher %x\n", keyconf->cipher);
 244                 break;
 245         }
 246 }
 247
 248 /**
 249  * iwl_sta_id_or_broadcast - return sta_id or broadcast sta
 250  * @context: the current context
 251  * @sta: mac80211 station
 252  *
 253  * In certain circumstances mac80211 passes a station pointer
 254  * that may be %NULL, for example during TX or key setup. In
 255  * that case, we need to use the broadcast station, so this
 256  * inline wraps that pattern.
 257  */
 258 static int iwl_sta_id_or_broadcast(struct iwl_rxon_context *context,
 259                                    struct ieee80211_sta *sta)
 260 {
 261         int sta_id;
 262
 263         if (!sta)
 264                 return context->bcast_sta_id;
 265
 266         sta_id = iwl_sta_id(sta);
 267
 268         /*
 269          * mac80211 should not be passing a partially
 270          * initialised station!
 271          */
 272         WARN_ON(sta_id == IWL_INVALID_STATION);
 273
 274         return sta_id;
 275 }
 276
 277 /*
 278  * start REPLY_TX command process
 279  */
 280 int iwlagn_tx_skb(struct iwl_priv *priv,
 281                   struct ieee80211_sta *sta,
 282                   struct sk_buff *skb)
 283 {
 284         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 285         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 286         struct iwl_station_priv *sta_priv = NULL;
 287         struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
 288         struct iwl_device_cmd *dev_cmd;
 289         struct iwl_tx_cmd *tx_cmd;
 290         __le16 fc;
 291         u8 hdr_len;
 292         u16 len, seq_number = 0;
 293         u8 sta_id, tid = IWL_MAX_TID_COUNT;
 294         bool is_agg = false, is_data_qos = false;
 295         int txq_id;
 296
 297         if (info->control.vif)
 298                 ctx = iwl_rxon_ctx_from_vif(info->control.vif);
 299
 300         if (iwl_is_rfkill(priv)) {
 301                 IWL_DEBUG_DROP(priv, "Dropping - RF KILL\n");
 302                 goto drop_unlock_priv;
 303         }
 304
 305         fc = hdr->frame_control;
 306
 307 #ifdef CONFIG_IWLWIFI_DEBUG
 308         if (ieee80211_is_auth(fc))
 309                 IWL_DEBUG_TX(priv, "Sending AUTH frame\n");
 310         else if (ieee80211_is_assoc_req(fc))
 311                 IWL_DEBUG_TX(priv, "Sending ASSOC frame\n");
 312         else if (ieee80211_is_reassoc_req(fc))
 313                 IWL_DEBUG_TX(priv, "Sending REASSOC frame\n");
 314 #endif
 315
 316         if (unlikely(ieee80211_is_probe_resp(fc))) {
 317                 struct iwl_wipan_noa_data *noa_data =
 318                         rcu_dereference(priv->noa_data);
 319
 320                 if (noa_data &&
 321                     pskb_expand_head(skb, 0, noa_data->length,
 322                                      GFP_ATOMIC) == 0) {
 323                         memcpy(skb_put(skb, noa_data->length),
 324                                noa_data->data, noa_data->length);
 325                         hdr = (struct ieee80211_hdr *)skb->data;
 326                 }
 327         }
 328
 329         hdr_len = ieee80211_hdrlen(fc);
 330
 331         /* For management frames use broadcast id to do not break aggregation */
 332         if (!ieee80211_is_data(fc))
 333                 sta_id = ctx->bcast_sta_id;
 334         else {
 335                 /* Find index into station table for destination station */
 336                 sta_id = iwl_sta_id_or_broadcast(ctx, sta);
 337                 if (sta_id == IWL_INVALID_STATION) {
 338                         IWL_DEBUG_DROP(priv, "Dropping - INVALID STATION: %pM\n",
 339                                        hdr->addr1);
 340                         goto drop_unlock_priv;
 341                 }
 342         }
 343
 344         if (sta)
 345                 sta_priv = (void *)sta->drv_priv;
 346
 347         if (sta_priv && sta_priv->asleep &&
 348             (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER)) {
 349                 /*
 350                  * This sends an asynchronous command to the device,
 351                  * but we can rely on it being processed before the
 352                  * next frame is processed -- and the next frame to
 353                  * this station is the one that will consume this
 354                  * counter.
 355                  * For now set the counter to just 1 since we do not
 356                  * support uAPSD yet.
 357                  *
 358                  * FIXME: If we get two non-bufferable frames one
 359                  * after the other, we might only send out one of
 360                  * them because this is racy.
 361                  */
 362                 iwl_sta_modify_sleep_tx_count(priv, sta_id, 1);
 363         }
 364
 365         dev_cmd = iwl_trans_alloc_tx_cmd(priv->trans);
 366
 367         if (unlikely(!dev_cmd))
 368                 goto drop_unlock_priv;
 369
 370         memset(dev_cmd, 0, sizeof(*dev_cmd));
 371         tx_cmd = (struct iwl_tx_cmd *) dev_cmd->payload;
 372
 373         /* Total # bytes to be transmitted */
 374         len = (u16)skb->len;
 375         tx_cmd->len = cpu_to_le16(len);
 376
 377         if (info->control.hw_key)
 378                 iwlagn_tx_cmd_build_hwcrypto(priv, info, tx_cmd, skb);
 379
 380         /* TODO need this for burst mode later on */
 381         iwlagn_tx_cmd_build_basic(priv, skb, tx_cmd, info, hdr, sta_id);
 382
 383         iwlagn_tx_cmd_build_rate(priv, tx_cmd, info, sta, fc);
 384
 385         memset(&info->status, 0, sizeof(info->status));
 386
 387         info->driver_data[0] = ctx;
 388         info->driver_data[1] = dev_cmd;
 389         /* From now on, we cannot access info->control */
 390
 391         spin_lock(&priv->sta_lock);
 392
 393         if (ieee80211_is_data_qos(fc) && !ieee80211_is_qos_nullfunc(fc)) {
 394                 u8 *qc = NULL;
 395                 struct iwl_tid_data *tid_data;
 396                 qc = ieee80211_get_qos_ctl(hdr);
 397                 tid = qc[0] & IEEE80211_QOS_CTL_TID_MASK;
 398                 if (WARN_ON_ONCE(tid >= IWL_MAX_TID_COUNT))
 399                         goto drop_unlock_sta;
 400                 tid_data = &priv->tid_data[sta_id][tid];
 401
 402                 /* aggregation is on for this <sta,tid> */
 403                 if (info->flags & IEEE80211_TX_CTL_AMPDU &&
 404                     tid_data->agg.state != IWL_AGG_ON) {
 405                         IWL_ERR(priv, "TX_CTL_AMPDU while not in AGG:"
 406                                 " Tx flags = 0x%08x, agg.state = %d",
 407                                 info->flags, tid_data->agg.state);
 408                         IWL_ERR(priv, "sta_id = %d, tid = %d seq_num = %d",
 409                                 sta_id, tid,
 410                                 IEEE80211_SEQ_TO_SN(tid_data->seq_number));
 411                         goto drop_unlock_sta;
 412                 }
 413
 414                 /* We can receive packets from the stack in IWL_AGG_{ON,OFF}
 415                  * only. Check this here.
 416                  */
 417                 if (WARN_ONCE(tid_data->agg.state != IWL_AGG_ON &&
 418                               tid_data->agg.state != IWL_AGG_OFF,
 419                     "Tx while agg.state = %d", tid_data->agg.state))
 420                         goto drop_unlock_sta;
 421
 422                 seq_number = tid_data->seq_number;
 423                 seq_number &= IEEE80211_SCTL_SEQ;
 424                 hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
 425                 hdr->seq_ctrl |= cpu_to_le16(seq_number);
 426                 seq_number += 0x10;
 427
 428                 if (info->flags & IEEE80211_TX_CTL_AMPDU)
 429                         is_agg = true;
 430                 is_data_qos = true;
 431         }
 432
 433         /* Copy MAC header from skb into command buffer */
 434         memcpy(tx_cmd->hdr, hdr, hdr_len);
 435
 436         if (is_agg)
 437                 txq_id = priv->tid_data[sta_id][tid].agg.txq_id;
 438         else if (info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) {
 439                 /*
 440                  * Send this frame after DTIM -- there's a special queue
 441                  * reserved for this for contexts that support AP mode.
 442                  */
 443                 txq_id = ctx->mcast_queue;
 444
 445                 /*
 446                  * The microcode will clear the more data
 447                  * bit in the last frame it transmits.
 448                  */
 449                 hdr->frame_control |=
 450                         cpu_to_le16(IEEE80211_FCTL_MOREDATA);
 451         } else if (info->flags & IEEE80211_TX_CTL_TX_OFFCHAN)
 452                 txq_id = IWL_AUX_QUEUE;
 453         else
 454                 txq_id = ctx->ac_to_queue[skb_get_queue_mapping(skb)];
 455
 456         WARN_ON_ONCE(!is_agg && txq_id != info->hw_queue);
 457         WARN_ON_ONCE(is_agg &&
 458                      priv->queue_to_mac80211[txq_id] != info->hw_queue);
 459
 460         IWL_DEBUG_TX(priv, "TX to [%d|%d] Q:%d - seq: 0x%x\n", sta_id, tid,
 461                      txq_id, seq_number);
 462
 463         if (iwl_trans_tx(priv->trans, skb, dev_cmd, txq_id))
 464                 goto drop_unlock_sta;
 465
 466         if (is_data_qos && !ieee80211_has_morefrags(fc))
 467                 priv->tid_data[sta_id][tid].seq_number = seq_number;
 468
 469         spin_unlock(&priv->sta_lock);
 470
 471         /*
 472          * Avoid atomic ops if it isn't an associated client.
 473          * Also, if this is a packet for aggregation, don't
 474          * increase the counter because the ucode will stop
 475          * aggregation queues when their respective station
 476          * goes to sleep.
 477          */
 478         if (sta_priv && sta_priv->client && !is_agg)
 479                 atomic_inc(&sta_priv->pending_frames);
 480
 481         if (info->flags & IEEE80211_TX_CTL_TX_OFFCHAN)
 482                 iwl_scan_offchannel_skb(priv);
 483
 484         return 0;
 485
 486 drop_unlock_sta:
 487         if (dev_cmd)
 488                 iwl_trans_free_tx_cmd(priv->trans, dev_cmd);
 489         spin_unlock(&priv->sta_lock);
 490 drop_unlock_priv:
 491         return -1;
 492 }
 493
 494 static int iwlagn_alloc_agg_txq(struct iwl_priv *priv, int mq)
 495 {
 496         int q;
 497
 498         for (q = IWLAGN_FIRST_AMPDU_QUEUE;
 499              q < priv->cfg->base_params->num_of_queues; q++) {
 500                 if (!test_and_set_bit(q, priv->agg_q_alloc)) {
 501                         priv->queue_to_mac80211[q] = mq;
 502                         return q;
 503                 }
 504         }
 505
 506         return -ENOSPC;
 507 }
 508
 509 static void iwlagn_dealloc_agg_txq(struct iwl_priv *priv, int q)
 510 {
 511         clear_bit(q, priv->agg_q_alloc);
 512         priv->queue_to_mac80211[q] = IWL_INVALID_MAC80211_QUEUE;
 513 }
 514
 515 int iwlagn_tx_agg_stop(struct iwl_priv *priv, struct ieee80211_vif *vif,
 516                         struct ieee80211_sta *sta, u16 tid)
 517 {
 518         struct iwl_tid_data *tid_data;
 519         int sta_id, txq_id;
 520         enum iwl_agg_state agg_state;
 521
 522         sta_id = iwl_sta_id(sta);
 523
 524         if (sta_id == IWL_INVALID_STATION) {
 525                 IWL_ERR(priv, "Invalid station for AGG tid %d\n", tid);
 526                 return -ENXIO;
 527         }
 528
 529         spin_lock_bh(&priv->sta_lock);
 530
 531         tid_data = &priv->tid_data[sta_id][tid];
 532         txq_id = tid_data->agg.txq_id;
 533
 534         switch (tid_data->agg.state) {
 535         case IWL_EMPTYING_HW_QUEUE_ADDBA:
 536                 /*
 537                 * This can happen if the peer stops aggregation
 538                 * again before we've had a chance to drain the
 539                 * queue we selected previously, i.e. before the
 540                 * session was really started completely.
 541                 */
 542                 IWL_DEBUG_HT(priv, "AGG stop before setup done\n");
 543                 goto turn_off;
 544         case IWL_AGG_STARTING:
 545                 /*
 546                  * This can happen when the session is stopped before
 547                  * we receive ADDBA response
 548                  */
 549                 IWL_DEBUG_HT(priv, "AGG stop before AGG became operational\n");
 550                 goto turn_off;
 551         case IWL_AGG_ON:
 552                 break;
 553         default:
 554                 IWL_WARN(priv,
 555                          "Stopping AGG while state not ON or starting for %d on %d (%d)\n",
 556                          sta_id, tid, tid_data->agg.state);
 557                 spin_unlock_bh(&priv->sta_lock);
 558                 return 0;
 559         }
 560
 561         tid_data->agg.ssn = IEEE80211_SEQ_TO_SN(tid_data->seq_number);
 562
 563         /* There are still packets for this RA / TID in the HW */
 564         if (!test_bit(txq_id, priv->agg_q_alloc)) {
 565                 IWL_DEBUG_TX_QUEUES(priv,
 566                         "stopping AGG on STA/TID %d/%d but hwq %d not used\n",
 567                         sta_id, tid, txq_id);
 568         } else if (tid_data->agg.ssn != tid_data->next_reclaimed) {
 569                 IWL_DEBUG_TX_QUEUES(priv,
 570                                     "Can't proceed: ssn %d, next_recl = %d\n",
 571                                     tid_data->agg.ssn,
 572                                     tid_data->next_reclaimed);
 573                 tid_data->agg.state = IWL_EMPTYING_HW_QUEUE_DELBA;
 574                 spin_unlock_bh(&priv->sta_lock);
 575                 return 0;
 576         }
 577
 578         IWL_DEBUG_TX_QUEUES(priv, "Can proceed: ssn = next_recl = %d\n",
 579                             tid_data->agg.ssn);
 580 turn_off:
 581         agg_state = tid_data->agg.state;
 582         tid_data->agg.state = IWL_AGG_OFF;
 583
 584         spin_unlock_bh(&priv->sta_lock);
 585
 586         if (test_bit(txq_id, priv->agg_q_alloc)) {
 587                 /*
 588                  * If the transport didn't know that we wanted to start
 589                  * agreggation, don't tell it that we want to stop them.
 590                  * This can happen when we don't get the addBA response on
 591                  * time, or we hadn't time to drain the AC queues.
 592                  */
 593                 if (agg_state == IWL_AGG_ON)
 594                         iwl_trans_txq_disable(priv->trans, txq_id);
 595                 else
 596                         IWL_DEBUG_TX_QUEUES(priv, "Don't disable tx agg: %d\n",
 597                                             agg_state);
 598                 iwlagn_dealloc_agg_txq(priv, txq_id);
 599         }
 600
 601         ieee80211_stop_tx_ba_cb_irqsafe(vif, sta->addr, tid);
 602
 603         return 0;
 604 }
 605
 606 int iwlagn_tx_agg_start(struct iwl_priv *priv, struct ieee80211_vif *vif,
 607                         struct ieee80211_sta *sta, u16 tid, u16 *ssn)
 608 {
 609         struct iwl_rxon_context *ctx = iwl_rxon_ctx_from_vif(vif);
 610         struct iwl_tid_data *tid_data;
 611         int sta_id, txq_id, ret;
 612
 613         IWL_DEBUG_HT(priv, "TX AGG request on ra = %pM tid = %d\n",
 614                      sta->addr, tid);
 615
 616         sta_id = iwl_sta_id(sta);
 617         if (sta_id == IWL_INVALID_STATION) {
 618                 IWL_ERR(priv, "Start AGG on invalid station\n");
 619                 return -ENXIO;
 620         }
 621         if (unlikely(tid >= IWL_MAX_TID_COUNT))
 622                 return -EINVAL;
 623
 624         if (priv->tid_data[sta_id][tid].agg.state != IWL_AGG_OFF) {
 625                 IWL_ERR(priv, "Start AGG when state is not IWL_AGG_OFF !\n");
 626                 return -ENXIO;
 627         }
 628
 629         txq_id = iwlagn_alloc_agg_txq(priv, ctx->ac_to_queue[tid_to_ac[tid]]);
 630         if (txq_id < 0) {
 631                 IWL_DEBUG_TX_QUEUES(priv,
 632                         "No free aggregation queue for %pM/%d\n",
 633                         sta->addr, tid);
 634                 return txq_id;
 635         }
 636
 637         ret = iwl_sta_tx_modify_enable_tid(priv, sta_id, tid);
 638         if (ret)
 639                 return ret;
 640
 641         spin_lock_bh(&priv->sta_lock);
 642         tid_data = &priv->tid_data[sta_id][tid];
 643         tid_data->agg.ssn = IEEE80211_SEQ_TO_SN(tid_data->seq_number);
 644         tid_data->agg.txq_id = txq_id;
 645
 646         *ssn = tid_data->agg.ssn;
 647
 648         if (*ssn == tid_data->next_reclaimed) {
 649                 IWL_DEBUG_TX_QUEUES(priv, "Can proceed: ssn = next_recl = %d\n",
 650                                     tid_data->agg.ssn);
 651                 tid_data->agg.state = IWL_AGG_STARTING;
 652                 ieee80211_start_tx_ba_cb_irqsafe(vif, sta->addr, tid);
 653         } else {
 654                 IWL_DEBUG_TX_QUEUES(priv, "Can't proceed: ssn %d, "
 655                                     "next_reclaimed = %d\n",
 656                                     tid_data->agg.ssn,
 657                                     tid_data->next_reclaimed);
 658                 tid_data->agg.state = IWL_EMPTYING_HW_QUEUE_ADDBA;
 659         }
 660         spin_unlock_bh(&priv->sta_lock);
 661
 662         return ret;
 663 }
 664
 665 int iwlagn_tx_agg_flush(struct iwl_priv *priv, struct ieee80211_vif *vif,
 666                         struct ieee80211_sta *sta, u16 tid)
 667 {
 668         struct iwl_tid_data *tid_data;
 669         enum iwl_agg_state agg_state;
 670         int sta_id, txq_id;
 671         sta_id = iwl_sta_id(sta);
 672
 673         /*
 674          * First set the agg state to OFF to avoid calling
 675          * ieee80211_stop_tx_ba_cb in iwlagn_check_ratid_empty.
 676          */
 677         spin_lock_bh(&priv->sta_lock);
 678
 679         tid_data = &priv->tid_data[sta_id][tid];
 680         txq_id = tid_data->agg.txq_id;
 681         agg_state = tid_data->agg.state;
 682         IWL_DEBUG_TX_QUEUES(priv, "Flush AGG: sta %d tid %d q %d state %d\n",
 683                             sta_id, tid, txq_id, tid_data->agg.state);
 684
 685         tid_data->agg.state = IWL_AGG_OFF;
 686
 687         spin_unlock_bh(&priv->sta_lock);
 688
 689         if (iwlagn_txfifo_flush(priv, BIT(txq_id)))
 690                 IWL_ERR(priv, "Couldn't flush the AGG queue\n");
 691
 692         if (test_bit(txq_id, priv->agg_q_alloc)) {
 693                 /*
 694                  * If the transport didn't know that we wanted to start
 695                  * agreggation, don't tell it that we want to stop them.
 696                  * This can happen when we don't get the addBA response on
 697                  * time, or we hadn't time to drain the AC queues.
 698                  */
 699                 if (agg_state == IWL_AGG_ON)
 700                         iwl_trans_txq_disable(priv->trans, txq_id);
 701                 else
 702                         IWL_DEBUG_TX_QUEUES(priv, "Don't disable tx agg: %d\n",
 703                                             agg_state);
 704                 iwlagn_dealloc_agg_txq(priv, txq_id);
 705         }
 706
 707         return 0;
 708 }
 709
 710 int iwlagn_tx_agg_oper(struct iwl_priv *priv, struct ieee80211_vif *vif,
 711                         struct ieee80211_sta *sta, u16 tid, u8 buf_size)
 712 {
 713         struct iwl_station_priv *sta_priv = (void *) sta->drv_priv;
 714         struct iwl_rxon_context *ctx = iwl_rxon_ctx_from_vif(vif);
 715         int q, fifo;
 716         u16 ssn;
 717
 718         buf_size = min_t(int, buf_size, LINK_QUAL_AGG_FRAME_LIMIT_DEF);
 719
 720         spin_lock_bh(&priv->sta_lock);
 721         ssn = priv->tid_data[sta_priv->sta_id][tid].agg.ssn;
 722         q = priv->tid_data[sta_priv->sta_id][tid].agg.txq_id;
 723         priv->tid_data[sta_priv->sta_id][tid].agg.state = IWL_AGG_ON;
 724         spin_unlock_bh(&priv->sta_lock);
 725
 726         fifo = ctx->ac_to_fifo[tid_to_ac[tid]];
 727
 728         iwl_trans_txq_enable(priv->trans, q, fifo, sta_priv->sta_id, tid,
 729                              buf_size, ssn);
 730
 731         /*
 732          * If the limit is 0, then it wasn't initialised yet,
 733          * use the default. We can do that since we take the
 734          * minimum below, and we don't want to go above our
 735          * default due to hardware restrictions.
 736          */
 737         if (sta_priv->max_agg_bufsize == 0)
 738                 sta_priv->max_agg_bufsize =
 739                         LINK_QUAL_AGG_FRAME_LIMIT_DEF;
 740
 741         /*
 742          * Even though in theory the peer could have different
 743          * aggregation reorder buffer sizes for different sessions,
 744          * our ucode doesn't allow for that and has a global limit
 745          * for each station. Therefore, use the minimum of all the
 746          * aggregation sessions and our default value.
 747          */
 748         sta_priv->max_agg_bufsize =
 749                 min(sta_priv->max_agg_bufsize, buf_size);
 750
 751         if (priv->hw_params.use_rts_for_aggregation) {
 752                 /*
 753                  * switch to RTS/CTS if it is the prefer protection
 754                  * method for HT traffic
 755                  */
 756
 757                 sta_priv->lq_sta.lq.general_params.flags |=
 758                         LINK_QUAL_FLAGS_SET_STA_TLC_RTS_MSK;
 759         }
 760         priv->agg_tids_count++;
 761         IWL_DEBUG_HT(priv, "priv->agg_tids_count = %u\n",
 762                      priv->agg_tids_count);
 763
 764         sta_priv->lq_sta.lq.agg_params.agg_frame_cnt_limit =
 765                 sta_priv->max_agg_bufsize;
 766
 767         IWL_DEBUG_HT(priv, "Tx aggregation enabled on ra = %pM tid = %d\n",
 768                  sta->addr, tid);
 769
 770         return iwl_send_lq_cmd(priv, ctx,
 771                         &sta_priv->lq_sta.lq, CMD_ASYNC, false);
 772 }
 773
 774 static void iwlagn_check_ratid_empty(struct iwl_priv *priv, int sta_id, u8 tid)
 775 {
 776         struct iwl_tid_data *tid_data = &priv->tid_data[sta_id][tid];
 777         enum iwl_rxon_context_id ctx;
 778         struct ieee80211_vif *vif;
 779         u8 *addr;
 780
 781         lockdep_assert_held(&priv->sta_lock);
 782
 783         addr = priv->stations[sta_id].sta.sta.addr;
 784         ctx = priv->stations[sta_id].ctxid;
 785         vif = priv->contexts[ctx].vif;
 786
 787         switch (priv->tid_data[sta_id][tid].agg.state) {
 788         case IWL_EMPTYING_HW_QUEUE_DELBA:
 789                 /* There are no packets for this RA / TID in the HW any more */
 790                 if (tid_data->agg.ssn == tid_data->next_reclaimed) {
 791                         IWL_DEBUG_TX_QUEUES(priv,
 792                                 "Can continue DELBA flow ssn = next_recl ="
 793                                 " %d", tid_data->next_reclaimed);
 794                         iwl_trans_txq_disable(priv->trans,
 795                                               tid_data->agg.txq_id);
 796                         iwlagn_dealloc_agg_txq(priv, tid_data->agg.txq_id);
 797                         tid_data->agg.state = IWL_AGG_OFF;
 798                         ieee80211_stop_tx_ba_cb_irqsafe(vif, addr, tid);
 799                 }
 800                 break;
 801         case IWL_EMPTYING_HW_QUEUE_ADDBA:
 802                 /* There are no packets for this RA / TID in the HW any more */
 803                 if (tid_data->agg.ssn == tid_data->next_reclaimed) {
 804                         IWL_DEBUG_TX_QUEUES(priv,
 805                                 "Can continue ADDBA flow ssn = next_recl ="
 806                                 " %d", tid_data->next_reclaimed);
 807                         tid_data->agg.state = IWL_AGG_STARTING;
 808                         ieee80211_start_tx_ba_cb_irqsafe(vif, addr, tid);
 809                 }
 810                 break;
 811         default:
 812                 break;
 813         }
 814 }
 815
 816 static void iwlagn_non_agg_tx_status(struct iwl_priv *priv,
 817                                      struct iwl_rxon_context *ctx,
 818                                      const u8 *addr1)
 819 {
 820         struct ieee80211_sta *sta;
 821         struct iwl_station_priv *sta_priv;
 822
 823         rcu_read_lock();
 824         sta = ieee80211_find_sta(ctx->vif, addr1);
 825         if (sta) {
 826                 sta_priv = (void *)sta->drv_priv;
 827                 /* avoid atomic ops if this isn't a client */
 828                 if (sta_priv->client &&
 829                     atomic_dec_return(&sta_priv->pending_frames) == 0)
 830                         ieee80211_sta_block_awake(priv->hw, sta, false);
 831         }
 832         rcu_read_unlock();
 833 }
 834
 835 /**
 836  * translate ucode response to mac80211 tx status control values
 837  */
 838 static void iwlagn_hwrate_to_tx_control(struct iwl_priv *priv, u32 rate_n_flags,
 839                                   struct ieee80211_tx_info *info)
 840 {
 841         struct ieee80211_tx_rate *r = &info->status.rates[0];
 842
 843         info->status.antenna =
 844                 ((rate_n_flags & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS);
 845         if (rate_n_flags & RATE_MCS_HT_MSK)
 846                 r->flags |= IEEE80211_TX_RC_MCS;
 847         if (rate_n_flags & RATE_MCS_GF_MSK)
 848                 r->flags |= IEEE80211_TX_RC_GREEN_FIELD;
 849         if (rate_n_flags & RATE_MCS_HT40_MSK)
 850                 r->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
 851         if (rate_n_flags & RATE_MCS_DUP_MSK)
 852                 r->flags |= IEEE80211_TX_RC_DUP_DATA;
 853         if (rate_n_flags & RATE_MCS_SGI_MSK)
 854                 r->flags |= IEEE80211_TX_RC_SHORT_GI;
 855         r->idx = iwlagn_hwrate_to_mac80211_idx(rate_n_flags, info->band);
 856 }
 857
 858 #ifdef CONFIG_IWLWIFI_DEBUG
 859 const char *iwl_get_tx_fail_reason(u32 status)
 860 {
 861 #define TX_STATUS_FAIL(x) case TX_STATUS_FAIL_ ## x: return #x
 862 #define TX_STATUS_POSTPONE(x) case TX_STATUS_POSTPONE_ ## x: return #x
 863
 864         switch (status & TX_STATUS_MSK) {
 865         case TX_STATUS_SUCCESS:
 866                 return "SUCCESS";
 867         TX_STATUS_POSTPONE(DELAY);
 868         TX_STATUS_POSTPONE(FEW_BYTES);
 869         TX_STATUS_POSTPONE(BT_PRIO);
 870         TX_STATUS_POSTPONE(QUIET_PERIOD);
 871         TX_STATUS_POSTPONE(CALC_TTAK);
 872         TX_STATUS_FAIL(INTERNAL_CROSSED_RETRY);
 873         TX_STATUS_FAIL(SHORT_LIMIT);
 874         TX_STATUS_FAIL(LONG_LIMIT);
 875         TX_STATUS_FAIL(FIFO_UNDERRUN);
 876         TX_STATUS_FAIL(DRAIN_FLOW);
 877         TX_STATUS_FAIL(RFKILL_FLUSH);
 878         TX_STATUS_FAIL(LIFE_EXPIRE);
 879         TX_STATUS_FAIL(DEST_PS);
 880         TX_STATUS_FAIL(HOST_ABORTED);
 881         TX_STATUS_FAIL(BT_RETRY);
 882         TX_STATUS_FAIL(STA_INVALID);
 883         TX_STATUS_FAIL(FRAG_DROPPED);
 884         TX_STATUS_FAIL(TID_DISABLE);
 885         TX_STATUS_FAIL(FIFO_FLUSHED);
 886         TX_STATUS_FAIL(INSUFFICIENT_CF_POLL);
 887         TX_STATUS_FAIL(PASSIVE_NO_RX);
 888         TX_STATUS_FAIL(NO_BEACON_ON_RADAR);
 889         }
 890
 891         return "UNKNOWN";
 892
 893 #undef TX_STATUS_FAIL
 894 #undef TX_STATUS_POSTPONE
 895 }
 896 #endif /* CONFIG_IWLWIFI_DEBUG */
 897
 898 static void iwlagn_count_agg_tx_err_status(struct iwl_priv *priv, u16 status)
 899 {
 900         status &= AGG_TX_STATUS_MSK;
 901
 902         switch (status) {
 903         case AGG_TX_STATE_UNDERRUN_MSK:
 904                 priv->reply_agg_tx_stats.underrun++;
 905                 break;
 906         case AGG_TX_STATE_BT_PRIO_MSK:
 907                 priv->reply_agg_tx_stats.bt_prio++;
 908                 break;
 909         case AGG_TX_STATE_FEW_BYTES_MSK:
 910                 priv->reply_agg_tx_stats.few_bytes++;
 911                 break;
 912         case AGG_TX_STATE_ABORT_MSK:
 913                 priv->reply_agg_tx_stats.abort++;
 914                 break;
 915         case AGG_TX_STATE_LAST_SENT_TTL_MSK:
 916                 priv->reply_agg_tx_stats.last_sent_ttl++;
 917                 break;
 918         case AGG_TX_STATE_LAST_SENT_TRY_CNT_MSK:
 919                 priv->reply_agg_tx_stats.last_sent_try++;
 920                 break;
 921         case AGG_TX_STATE_LAST_SENT_BT_KILL_MSK:
 922                 priv->reply_agg_tx_stats.last_sent_bt_kill++;
 923                 break;
 924         case AGG_TX_STATE_SCD_QUERY_MSK:
 925                 priv->reply_agg_tx_stats.scd_query++;
 926                 break;
 927         case AGG_TX_STATE_TEST_BAD_CRC32_MSK:
 928                 priv->reply_agg_tx_stats.bad_crc32++;
 929                 break;
 930         case AGG_TX_STATE_RESPONSE_MSK:
 931                 priv->reply_agg_tx_stats.response++;
 932                 break;
 933         case AGG_TX_STATE_DUMP_TX_MSK:
 934                 priv->reply_agg_tx_stats.dump_tx++;
 935                 break;
 936         case AGG_TX_STATE_DELAY_TX_MSK:
 937                 priv->reply_agg_tx_stats.delay_tx++;
 938                 break;
 939         default:
 940                 priv->reply_agg_tx_stats.unknown++;
 941                 break;
 942         }
 943 }
 944
 945 static inline u32 iwlagn_get_scd_ssn(struct iwlagn_tx_resp *tx_resp)
 946 {
 947         return le32_to_cpup((__le32 *)&tx_resp->status +
 948                             tx_resp->frame_count) & IEEE80211_MAX_SN;
 949 }
 950
 951 static void iwl_rx_reply_tx_agg(struct iwl_priv *priv,
 952                                 struct iwlagn_tx_resp *tx_resp)
 953 {
 954         struct agg_tx_status *frame_status = &tx_resp->status;
 955         int tid = (tx_resp->ra_tid & IWLAGN_TX_RES_TID_MSK) >>
 956                 IWLAGN_TX_RES_TID_POS;
 957         int sta_id = (tx_resp->ra_tid & IWLAGN_TX_RES_RA_MSK) >>
 958                 IWLAGN_TX_RES_RA_POS;
 959         struct iwl_ht_agg *agg = &priv->tid_data[sta_id][tid].agg;
 960         u32 status = le16_to_cpu(tx_resp->status.status);
 961         int i;
 962
 963         WARN_ON(tid == IWL_TID_NON_QOS);
 964
 965         if (agg->wait_for_ba)
 966                 IWL_DEBUG_TX_REPLY(priv,
 967                         "got tx response w/o block-ack\n");
 968
 969         agg->rate_n_flags = le32_to_cpu(tx_resp->rate_n_flags);
 970         agg->wait_for_ba = (tx_resp->frame_count > 1);
 971
 972         /*
 973          * If the BT kill count is non-zero, we'll get this
 974          * notification again.
 975          */
 976         if (tx_resp->bt_kill_count && tx_resp->frame_count == 1 &&
 977             priv->lib->bt_params &&
 978             priv->lib->bt_params->advanced_bt_coexist) {
 979                 IWL_DEBUG_COEX(priv, "receive reply tx w/ bt_kill\n");
 980         }
 981
 982         if (tx_resp->frame_count == 1)
 983                 return;
 984
 985         IWL_DEBUG_TX_REPLY(priv, "TXQ %d initial_rate 0x%x ssn %d frm_cnt %d\n",
 986                            agg->txq_id,
 987                            le32_to_cpu(tx_resp->rate_n_flags),
 988                            iwlagn_get_scd_ssn(tx_resp), tx_resp->frame_count);
 989
 990         /* Construct bit-map of pending frames within Tx window */
 991         for (i = 0; i < tx_resp->frame_count; i++) {
 992                 u16 fstatus = le16_to_cpu(frame_status[i].status);
 993                 u8 retry_cnt = (fstatus & AGG_TX_TRY_MSK) >> AGG_TX_TRY_POS;
 994
 995                 if (status & AGG_TX_STATUS_MSK)
 996                         iwlagn_count_agg_tx_err_status(priv, fstatus);
 997
 998                 if (status & (AGG_TX_STATE_FEW_BYTES_MSK |
 999                               AGG_TX_STATE_ABORT_MSK))
1000                         continue;
1001
1002                 if (status & AGG_TX_STATUS_MSK || retry_cnt > 1)
1003                         IWL_DEBUG_TX_REPLY(priv,
1004                                            "%d: status %s (0x%04x), try-count (0x%01x)\n",
1005                                            i,
1006                                            iwl_get_agg_tx_fail_reason(fstatus),
1007                                            fstatus & AGG_TX_STATUS_MSK,
1008                                            retry_cnt);
1009         }
1010 }
1011
1012 #ifdef CONFIG_IWLWIFI_DEBUG
1013 #define AGG_TX_STATE_FAIL(x) case AGG_TX_STATE_ ## x: return #x
1014
1015 const char *iwl_get_agg_tx_fail_reason(u16 status)
1016 {
1017         status &= AGG_TX_STATUS_MSK;
1018         switch (status) {
1019         case AGG_TX_STATE_TRANSMITTED:
1020                 return "SUCCESS";
1021                 AGG_TX_STATE_FAIL(UNDERRUN_MSK);
1022                 AGG_TX_STATE_FAIL(BT_PRIO_MSK);
1023                 AGG_TX_STATE_FAIL(FEW_BYTES_MSK);
1024                 AGG_TX_STATE_FAIL(ABORT_MSK);
1025                 AGG_TX_STATE_FAIL(LAST_SENT_TTL_MSK);
1026                 AGG_TX_STATE_FAIL(LAST_SENT_TRY_CNT_MSK);
1027                 AGG_TX_STATE_FAIL(LAST_SENT_BT_KILL_MSK);
1028                 AGG_TX_STATE_FAIL(SCD_QUERY_MSK);
1029                 AGG_TX_STATE_FAIL(TEST_BAD_CRC32_MSK);
1030                 AGG_TX_STATE_FAIL(RESPONSE_MSK);
1031                 AGG_TX_STATE_FAIL(DUMP_TX_MSK);
1032                 AGG_TX_STATE_FAIL(DELAY_TX_MSK);
1033         }
1034
1035         return "UNKNOWN";
1036 }
1037 #endif /* CONFIG_IWLWIFI_DEBUG */
1038
1039 static void iwlagn_count_tx_err_status(struct iwl_priv *priv, u16 status)
1040 {
1041         status &= TX_STATUS_MSK;
1042
1043         switch (status) {
1044         case TX_STATUS_POSTPONE_DELAY:
1045                 priv->reply_tx_stats.pp_delay++;
1046                 break;
1047         case TX_STATUS_POSTPONE_FEW_BYTES:
1048                 priv->reply_tx_stats.pp_few_bytes++;
1049                 break;
1050         case TX_STATUS_POSTPONE_BT_PRIO:
1051                 priv->reply_tx_stats.pp_bt_prio++;
1052                 break;
1053         case TX_STATUS_POSTPONE_QUIET_PERIOD:
1054                 priv->reply_tx_stats.pp_quiet_period++;
1055                 break;
1056         case TX_STATUS_POSTPONE_CALC_TTAK:
1057                 priv->reply_tx_stats.pp_calc_ttak++;
1058                 break;
1059         case TX_STATUS_FAIL_INTERNAL_CROSSED_RETRY:
1060                 priv->reply_tx_stats.int_crossed_retry++;
1061                 break;
1062         case TX_STATUS_FAIL_SHORT_LIMIT:
1063                 priv->reply_tx_stats.short_limit++;
1064                 break;
1065         case TX_STATUS_FAIL_LONG_LIMIT:
1066                 priv->reply_tx_stats.long_limit++;
1067                 break;
1068         case TX_STATUS_FAIL_FIFO_UNDERRUN:
1069                 priv->reply_tx_stats.fifo_underrun++;
1070                 break;
1071         case TX_STATUS_FAIL_DRAIN_FLOW:
1072                 priv->reply_tx_stats.drain_flow++;
1073                 break;
1074         case TX_STATUS_FAIL_RFKILL_FLUSH:
1075                 priv->reply_tx_stats.rfkill_flush++;
1076                 break;
1077         case TX_STATUS_FAIL_LIFE_EXPIRE:
1078                 priv->reply_tx_stats.life_expire++;
1079                 break;
1080         case TX_STATUS_FAIL_DEST_PS:
1081                 priv->reply_tx_stats.dest_ps++;
1082                 break;
1083         case TX_STATUS_FAIL_HOST_ABORTED:
1084                 priv->reply_tx_stats.host_abort++;
1085                 break;
1086         case TX_STATUS_FAIL_BT_RETRY:
1087                 priv->reply_tx_stats.bt_retry++;
1088                 break;
1089         case TX_STATUS_FAIL_STA_INVALID:
1090                 priv->reply_tx_stats.sta_invalid++;
1091                 break;
1092         case TX_STATUS_FAIL_FRAG_DROPPED:
1093                 priv->reply_tx_stats.frag_drop++;
1094                 break;
1095         case TX_STATUS_FAIL_TID_DISABLE:
1096                 priv->reply_tx_stats.tid_disable++;
1097                 break;
1098         case TX_STATUS_FAIL_FIFO_FLUSHED:
1099                 priv->reply_tx_stats.fifo_flush++;
1100                 break;
1101         case TX_STATUS_FAIL_INSUFFICIENT_CF_POLL:
1102                 priv->reply_tx_stats.insuff_cf_poll++;
1103                 break;
1104         case TX_STATUS_FAIL_PASSIVE_NO_RX:
1105                 priv->reply_tx_stats.fail_hw_drop++;
1106                 break;
1107         case TX_STATUS_FAIL_NO_BEACON_ON_RADAR:
1108                 priv->reply_tx_stats.sta_color_mismatch++;
1109                 break;
1110         default:
1111                 priv->reply_tx_stats.unknown++;
1112                 break;
1113         }
1114 }
1115
1116 static void iwlagn_set_tx_status(struct iwl_priv *priv,
1117                                  struct ieee80211_tx_info *info,
1118                                  struct iwlagn_tx_resp *tx_resp)
1119 {
1120         u16 status = le16_to_cpu(tx_resp->status.status);
1121
1122         info->flags &= ~IEEE80211_TX_CTL_AMPDU;
1123
1124         info->status.rates[0].count = tx_resp->failure_frame + 1;
1125         info->flags |= iwl_tx_status_to_mac80211(status);
1126         iwlagn_hwrate_to_tx_control(priv, le32_to_cpu(tx_resp->rate_n_flags),
1127                                     info);
1128         if (!iwl_is_tx_success(status))
1129                 iwlagn_count_tx_err_status(priv, status);
1130 }
1131
1132 static void iwl_check_abort_status(struct iwl_priv *priv,
1133                             u8 frame_count, u32 status)
1134 {
1135         if (frame_count == 1 && status == TX_STATUS_FAIL_RFKILL_FLUSH) {
1136                 IWL_ERR(priv, "Tx flush command to flush out all frames\n");
1137                 if (!test_bit(STATUS_EXIT_PENDING, &priv->status))
1138                         queue_work(priv->workqueue, &priv->tx_flush);
1139         }
1140 }
1141
1142 int iwlagn_rx_reply_tx(struct iwl_priv *priv, struct iwl_rx_cmd_buffer *rxb,
1143                                struct iwl_device_cmd *cmd)
1144 {
1145         struct iwl_rx_packet *pkt = rxb_addr(rxb);
1146         u16 sequence = le16_to_cpu(pkt->hdr.sequence);
1147         int txq_id = SEQ_TO_QUEUE(sequence);
1148         int cmd_index __maybe_unused = SEQ_TO_INDEX(sequence);
1149         struct iwlagn_tx_resp *tx_resp = (void *)pkt->data;
1150         struct ieee80211_hdr *hdr;
1151         u32 status = le16_to_cpu(tx_resp->status.status);
1152         u16 ssn = iwlagn_get_scd_ssn(tx_resp);
1153         int tid;
1154         int sta_id;
1155         int freed;
1156         struct ieee80211_tx_info *info;
1157         struct sk_buff_head skbs;
1158         struct sk_buff *skb;
1159         struct iwl_rxon_context *ctx;
1160         bool is_agg = (txq_id >= IWLAGN_FIRST_AMPDU_QUEUE);
1161         bool is_offchannel_skb;
1162
1163         tid = (tx_resp->ra_tid & IWLAGN_TX_RES_TID_MSK) >>
1164                 IWLAGN_TX_RES_TID_POS;
1165         sta_id = (tx_resp->ra_tid & IWLAGN_TX_RES_RA_MSK) >>
1166                 IWLAGN_TX_RES_RA_POS;
1167
1168         spin_lock_bh(&priv->sta_lock);
1169
1170         if (is_agg) {
1171                 WARN_ON_ONCE(sta_id >= IWLAGN_STATION_COUNT ||
1172                              tid >= IWL_MAX_TID_COUNT);
1173                 if (txq_id != priv->tid_data[sta_id][tid].agg.txq_id)
1174                         IWL_ERR(priv, "txq_id mismatch: %d %d\n", txq_id,
1175                                 priv->tid_data[sta_id][tid].agg.txq_id);
1176                 iwl_rx_reply_tx_agg(priv, tx_resp);
1177         }
1178
1179         __skb_queue_head_init(&skbs);
1180
1181         is_offchannel_skb = false;
1182
1183         if (tx_resp->frame_count == 1) {
1184                 u16 next_reclaimed = le16_to_cpu(tx_resp->seq_ctl);
1185                 next_reclaimed = IEEE80211_SEQ_TO_SN(next_reclaimed + 0x10);
1186
1187                 if (is_agg) {
1188                         /* If this is an aggregation queue, we can rely on the
1189                          * ssn since the wifi sequence number corresponds to
1190                          * the index in the TFD ring (%256).
1191                          * The seq_ctl is the sequence control of the packet
1192                          * to which this Tx response relates. But if there is a
1193                          * hole in the bitmap of the BA we received, this Tx
1194                          * response may allow to reclaim the hole and all the
1195                          * subsequent packets that were already acked.
1196                          * In that case, seq_ctl != ssn, and the next packet
1197                          * to be reclaimed will be ssn and not seq_ctl.
1198                          */
1199                         next_reclaimed = ssn;
1200                 }
1201
1202                 if (tid != IWL_TID_NON_QOS) {
1203                         priv->tid_data[sta_id][tid].next_reclaimed =
1204                                 next_reclaimed;
1205                         IWL_DEBUG_TX_REPLY(priv, "Next reclaimed packet:%d\n",
1206                                                   next_reclaimed);
1207                 }
1208
1209                 iwl_trans_reclaim(priv->trans, txq_id, ssn, &skbs);
1210
1211                 iwlagn_check_ratid_empty(priv, sta_id, tid);
1212                 freed = 0;
1213
1214                 /* process frames */
1215                 skb_queue_walk(&skbs, skb) {
1216                         hdr = (struct ieee80211_hdr *)skb->data;
1217
1218                         if (!ieee80211_is_data_qos(hdr->frame_control))
1219                                 priv->last_seq_ctl = tx_resp->seq_ctl;
1220
1221                         info = IEEE80211_SKB_CB(skb);
1222                         ctx = info->driver_data[0];
1223                         iwl_trans_free_tx_cmd(priv->trans,
1224                                               info->driver_data[1]);
1225
1226                         memset(&info->status, 0, sizeof(info->status));
1227
1228                         if (status == TX_STATUS_FAIL_PASSIVE_NO_RX &&
1229                             ctx->vif &&
1230                             ctx->vif->type == NL80211_IFTYPE_STATION) {
1231                                 /* block and stop all queues */
1232                                 priv->passive_no_rx = true;
1233                                 IWL_DEBUG_TX_QUEUES(priv, "stop all queues: "
1234                                                     "passive channel");
1235                                 ieee80211_stop_queues(priv->hw);
1236
1237                                 IWL_DEBUG_TX_REPLY(priv,
1238                                            "TXQ %d status %s (0x%08x) "
1239                                            "rate_n_flags 0x%x retries %d\n",
1240                                            txq_id,
1241                                            iwl_get_tx_fail_reason(status),
1242                                            status,
1243                                            le32_to_cpu(tx_resp->rate_n_flags),
1244                                            tx_resp->failure_frame);
1245
1246                                 IWL_DEBUG_TX_REPLY(priv,
1247                                            "FrameCnt = %d, idx=%d\n",
1248                                            tx_resp->frame_count, cmd_index);
1249                         }
1250
1251                         /* check if BAR is needed */
1252                         if (is_agg && !iwl_is_tx_success(status))
1253                                 info->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK;
1254                         iwlagn_set_tx_status(priv, IEEE80211_SKB_CB(skb),
1255                                      tx_resp);
1256                         if (!is_agg)
1257                                 iwlagn_non_agg_tx_status(priv, ctx, hdr->addr1);
1258
1259                         is_offchannel_skb =
1260                                 (info->flags & IEEE80211_TX_CTL_TX_OFFCHAN);
1261                         freed++;
1262                 }
1263
1264                 if (tid != IWL_TID_NON_QOS) {
1265                         priv->tid_data[sta_id][tid].next_reclaimed =
1266                                 next_reclaimed;
1267                         IWL_DEBUG_TX_REPLY(priv, "Next reclaimed packet:%d\n",
1268                                            next_reclaimed);
1269                 }
1270
1271                 if (!is_agg && freed != 1)
1272                         IWL_ERR(priv, "Q: %d, freed %d\n", txq_id, freed);
1273
1274                 /*
1275                  * An offchannel frame can be send only on the AUX queue, where
1276                  * there is no aggregation (and reordering) so it only is single
1277                  * skb is expected to be processed.
1278                  */
1279                 if (is_offchannel_skb && freed != 1)
1280                         IWL_ERR(priv, "OFFCHANNEL SKB freed %d\n", freed);
1281
1282                 IWL_DEBUG_TX_REPLY(priv, "TXQ %d status %s (0x%08x)\n", txq_id,
1283                                    iwl_get_tx_fail_reason(status), status);
1284
1285                 IWL_DEBUG_TX_REPLY(priv,
1286                                    "\t\t\t\tinitial_rate 0x%x retries %d, idx=%d ssn=%d seq_ctl=0x%x\n",
1287                                    le32_to_cpu(tx_resp->rate_n_flags),
1288                                    tx_resp->failure_frame,
1289                                    SEQ_TO_INDEX(sequence), ssn,
1290                                    le16_to_cpu(tx_resp->seq_ctl));
1291         }
1292
1293         iwl_check_abort_status(priv, tx_resp->frame_count, status);
1294         spin_unlock_bh(&priv->sta_lock);
1295
1296         while (!skb_queue_empty(&skbs)) {
1297                 skb = __skb_dequeue(&skbs);
1298                 ieee80211_tx_status_ni(priv->hw, skb);
1299         }
1300
1301         if (is_offchannel_skb)
1302                 iwl_scan_offchannel_skb_status(priv);
1303
1304         return 0;
1305 }
1306
1307 /**
1308  * iwlagn_rx_reply_compressed_ba - Handler for REPLY_COMPRESSED_BA
1309  *
1310  * Handles block-acknowledge notification from device, which reports success
1311  * of frames sent via aggregation.
1312  */
1313 int iwlagn_rx_reply_compressed_ba(struct iwl_priv *priv,
1314                                    struct iwl_rx_cmd_buffer *rxb,
1315                                    struct iwl_device_cmd *cmd)
1316 {
1317         struct iwl_rx_packet *pkt = rxb_addr(rxb);
1318         struct iwl_compressed_ba_resp *ba_resp = (void *)pkt->data;
1319         struct iwl_ht_agg *agg;
1320         struct sk_buff_head reclaimed_skbs;
1321         struct ieee80211_tx_info *info;
1322         struct ieee80211_hdr *hdr;
1323         struct sk_buff *skb;
1324         int sta_id;
1325         int tid;
1326         int freed;
1327
1328         /* "flow" corresponds to Tx queue */
1329         u16 scd_flow = le16_to_cpu(ba_resp->scd_flow);
1330
1331         /* "ssn" is start of block-ack Tx window, corresponds to index
1332          * (in Tx queue's circular buffer) of first TFD/frame in window */
1333         u16 ba_resp_scd_ssn = le16_to_cpu(ba_resp->scd_ssn);
1334
1335         if (scd_flow >= priv->cfg->base_params->num_of_queues) {
1336                 IWL_ERR(priv,
1337                         "BUG_ON scd_flow is bigger than number of queues\n");
1338                 return 0;
1339         }
1340
1341         sta_id = ba_resp->sta_id;
1342         tid = ba_resp->tid;
1343         agg = &priv->tid_data[sta_id][tid].agg;
1344
1345         spin_lock_bh(&priv->sta_lock);
1346
1347         if (unlikely(!agg->wait_for_ba)) {
1348                 if (unlikely(ba_resp->bitmap))
1349                         IWL_ERR(priv, "Received BA when not expected\n");
1350                 spin_unlock_bh(&priv->sta_lock);
1351                 return 0;
1352         }
1353
1354         if (unlikely(scd_flow != agg->txq_id)) {
1355                 /*
1356                  * FIXME: this is a uCode bug which need to be addressed,
1357                  * log the information and return for now.
1358                  * Since it is can possibly happen very often and in order
1359                  * not to fill the syslog, don't use IWL_ERR or IWL_WARN
1360                  */
1361                 IWL_DEBUG_TX_QUEUES(priv,
1362                                     "Bad queue mapping txq_id=%d, agg_txq[sta:%d,tid:%d]=%d\n",
1363                                     scd_flow, sta_id, tid, agg->txq_id);
1364                 spin_unlock_bh(&priv->sta_lock);
1365                 return 0;
1366         }
1367
1368         __skb_queue_head_init(&reclaimed_skbs);
1369
1370         /* Release all TFDs before the SSN, i.e. all TFDs in front of
1371          * block-ack window (we assume that they've been successfully
1372          * transmitted ... if not, it's too late anyway). */
1373         iwl_trans_reclaim(priv->trans, scd_flow, ba_resp_scd_ssn,
1374                           &reclaimed_skbs);
1375
1376         IWL_DEBUG_TX_REPLY(priv, "REPLY_COMPRESSED_BA [%d] Received from %pM, "
1377                            "sta_id = %d\n",
1378                            agg->wait_for_ba,
1379                            (u8 *) &ba_resp->sta_addr_lo32,
1380                            ba_resp->sta_id);
1381         IWL_DEBUG_TX_REPLY(priv, "TID = %d, SeqCtl = %d, bitmap = 0x%llx, "
1382                            "scd_flow = %d, scd_ssn = %d sent:%d, acked:%d\n",
1383                            ba_resp->tid, le16_to_cpu(ba_resp->seq_ctl),
1384                            (unsigned long long)le64_to_cpu(ba_resp->bitmap),
1385                            scd_flow, ba_resp_scd_ssn, ba_resp->txed,
1386                            ba_resp->txed_2_done);
1387
1388         /* Mark that the expected block-ack response arrived */
1389         agg->wait_for_ba = false;
1390
1391         /* Sanity check values reported by uCode */
1392         if (ba_resp->txed_2_done > ba_resp->txed) {
1393                 IWL_DEBUG_TX_REPLY(priv,
1394                         "bogus sent(%d) and ack(%d) count\n",
1395                         ba_resp->txed, ba_resp->txed_2_done);
1396                 /*
1397                  * set txed_2_done = txed,
1398                  * so it won't impact rate scale
1399                  */
1400                 ba_resp->txed = ba_resp->txed_2_done;
1401         }
1402
1403         priv->tid_data[sta_id][tid].next_reclaimed = ba_resp_scd_ssn;
1404
1405         iwlagn_check_ratid_empty(priv, sta_id, tid);
1406         freed = 0;
1407
1408         skb_queue_walk(&reclaimed_skbs, skb) {
1409                 hdr = (struct ieee80211_hdr *)skb->data;
1410
1411                 if (ieee80211_is_data_qos(hdr->frame_control))
1412                         freed++;
1413                 else
1414                         WARN_ON_ONCE(1);
1415
1416                 info = IEEE80211_SKB_CB(skb);
1417                 iwl_trans_free_tx_cmd(priv->trans, info->driver_data[1]);
1418
1419                 if (freed == 1) {
1420                         /* this is the first skb we deliver in this batch */
1421                         /* put the rate scaling data there */
1422                         info = IEEE80211_SKB_CB(skb);
1423                         memset(&info->status, 0, sizeof(info->status));
1424                         info->flags |= IEEE80211_TX_STAT_ACK;
1425                         info->flags |= IEEE80211_TX_STAT_AMPDU;
1426                         info->status.ampdu_ack_len = ba_resp->txed_2_done;
1427                         info->status.ampdu_len = ba_resp->txed;
1428                         iwlagn_hwrate_to_tx_control(priv, agg->rate_n_flags,
1429                                                     info);
1430                 }
1431         }
1432
1433         spin_unlock_bh(&priv->sta_lock);
1434
1435         while (!skb_queue_empty(&reclaimed_skbs)) {
1436                 skb = __skb_dequeue(&reclaimed_skbs);
1437                 ieee80211_tx_status_ni(priv->hw, skb);
1438         }
1439
1440         return 0;
1441 }