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-io.h"
  39 #include "iwl-agn-hw.h"
  40 #include "iwl-agn.h"
  41 #include "iwl-trans.h"
  42
  43 static void iwlagn_tx_cmd_protection(struct iwl_priv *priv,
  44                                      struct ieee80211_tx_info *info,
  45                                      __le16 fc, __le32 *tx_flags)
  46 {
  47         if (info->control.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS ||
  48             info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT ||
  49             info->flags & IEEE80211_TX_CTL_AMPDU)
  50                 *tx_flags |= TX_CMD_FLG_PROT_REQUIRE_MSK;
  51 }
  52
  53 /*
  54  * handle build REPLY_TX command notification.
  55  */
  56 static void iwlagn_tx_cmd_build_basic(struct iwl_priv *priv,
  57                                       struct sk_buff *skb,
  58                                       struct iwl_tx_cmd *tx_cmd,
  59                                       struct ieee80211_tx_info *info,
  60                                       struct ieee80211_hdr *hdr, u8 sta_id)
  61 {
  62         __le16 fc = hdr->frame_control;
  63         __le32 tx_flags = tx_cmd->tx_flags;
  64
  65         tx_cmd->stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
  66
  67         if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
  68                 tx_flags |= TX_CMD_FLG_ACK_MSK;
  69         else
  70                 tx_flags &= ~TX_CMD_FLG_ACK_MSK;
  71
  72         if (ieee80211_is_probe_resp(fc))
  73                 tx_flags |= TX_CMD_FLG_TSF_MSK;
  74         else if (ieee80211_is_back_req(fc))
  75                 tx_flags |= TX_CMD_FLG_ACK_MSK | TX_CMD_FLG_IMM_BA_RSP_MASK;
  76         else if (info->band == IEEE80211_BAND_2GHZ &&
  77                  cfg(priv)->bt_params &&
  78                  cfg(priv)->bt_params->advanced_bt_coexist &&
  79                  (ieee80211_is_auth(fc) || ieee80211_is_assoc_req(fc) ||
  80                  ieee80211_is_reassoc_req(fc) ||
  81                  skb->protocol == cpu_to_be16(ETH_P_PAE)))
  82                 tx_flags |= TX_CMD_FLG_IGNORE_BT;
  83
  84
  85         tx_cmd->sta_id = sta_id;
  86         if (ieee80211_has_morefrags(fc))
  87                 tx_flags |= TX_CMD_FLG_MORE_FRAG_MSK;
  88
  89         if (ieee80211_is_data_qos(fc)) {
  90                 u8 *qc = ieee80211_get_qos_ctl(hdr);
  91                 tx_cmd->tid_tspec = qc[0] & 0xf;
  92                 tx_flags &= ~TX_CMD_FLG_SEQ_CTL_MSK;
  93         } else {
  94                 if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ)
  95                         tx_flags |= TX_CMD_FLG_SEQ_CTL_MSK;
  96                 else
  97                         tx_flags &= ~TX_CMD_FLG_SEQ_CTL_MSK;
  98         }
  99
 100         iwlagn_tx_cmd_protection(priv, info, fc, &tx_flags);
 101
 102         tx_flags &= ~(TX_CMD_FLG_ANT_SEL_MSK);
 103         if (ieee80211_is_mgmt(fc)) {
 104                 if (ieee80211_is_assoc_req(fc) || ieee80211_is_reassoc_req(fc))
 105                         tx_cmd->timeout.pm_frame_timeout = cpu_to_le16(3);
 106                 else
 107                         tx_cmd->timeout.pm_frame_timeout = cpu_to_le16(2);
 108         } else {
 109                 tx_cmd->timeout.pm_frame_timeout = 0;
 110         }
 111
 112         tx_cmd->driver_txop = 0;
 113         tx_cmd->tx_flags = tx_flags;
 114         tx_cmd->next_frame_len = 0;
 115 }
 116
 117 static void iwlagn_tx_cmd_build_rate(struct iwl_priv *priv,
 118                                      struct iwl_tx_cmd *tx_cmd,
 119                                      struct ieee80211_tx_info *info,
 120                                      __le16 fc)
 121 {
 122         u32 rate_flags;
 123         int rate_idx;
 124         u8 rts_retry_limit;
 125         u8 data_retry_limit;
 126         u8 rate_plcp;
 127
 128         if (priv->shrd->wowlan) {
 129                 rts_retry_limit = IWLAGN_LOW_RETRY_LIMIT;
 130                 data_retry_limit = IWLAGN_LOW_RETRY_LIMIT;
 131         } else {
 132                 /* Set retry limit on RTS packets */
 133                 rts_retry_limit = IWLAGN_RTS_DFAULT_RETRY_LIMIT;
 134
 135                 /* Set retry limit on DATA packets and Probe Responses*/
 136                 if (ieee80211_is_probe_resp(fc)) {
 137                         data_retry_limit = IWLAGN_MGMT_DFAULT_RETRY_LIMIT;
 138                         rts_retry_limit =
 139                                 min(data_retry_limit, rts_retry_limit);
 140                 } else if (ieee80211_is_back_req(fc))
 141                         data_retry_limit = IWLAGN_BAR_DFAULT_RETRY_LIMIT;
 142                 else
 143                         data_retry_limit = IWLAGN_DEFAULT_TX_RETRY;
 144         }
 145
 146         tx_cmd->data_retry_limit = data_retry_limit;
 147         tx_cmd->rts_retry_limit = rts_retry_limit;
 148
 149         /* DATA packets will use the uCode station table for rate/antenna
 150          * selection */
 151         if (ieee80211_is_data(fc)) {
 152                 tx_cmd->initial_rate_index = 0;
 153                 tx_cmd->tx_flags |= TX_CMD_FLG_STA_RATE_MSK;
 154 #ifdef CONFIG_IWLWIFI_DEVICE_TESTMODE
 155                 if (priv->tm_fixed_rate) {
 156                         /*
 157                          * rate overwrite by testmode
 158                          * we not only send lq command to change rate
 159                          * we also re-enforce per data pkt base.
 160                          */
 161                         tx_cmd->tx_flags &= ~TX_CMD_FLG_STA_RATE_MSK;
 162                         memcpy(&tx_cmd->rate_n_flags, &priv->tm_fixed_rate,
 163                                sizeof(tx_cmd->rate_n_flags));
 164                 }
 165 #endif
 166                 return;
 167         } else if (ieee80211_is_back_req(fc))
 168                 tx_cmd->tx_flags |= TX_CMD_FLG_STA_RATE_MSK;
 169
 170         /**
 171          * If the current TX rate stored in mac80211 has the MCS bit set, it's
 172          * not really a TX rate.  Thus, we use the lowest supported rate for
 173          * this band.  Also use the lowest supported rate if the stored rate
 174          * index is invalid.
 175          */
 176         rate_idx = info->control.rates[0].idx;
 177         if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS ||
 178                         (rate_idx < 0) || (rate_idx > IWL_RATE_COUNT_LEGACY))
 179                 rate_idx = rate_lowest_index(&priv->bands[info->band],
 180                                 info->control.sta);
 181         /* For 5 GHZ band, remap mac80211 rate indices into driver indices */
 182         if (info->band == IEEE80211_BAND_5GHZ)
 183                 rate_idx += IWL_FIRST_OFDM_RATE;
 184         /* Get PLCP rate for tx_cmd->rate_n_flags */
 185         rate_plcp = iwl_rates[rate_idx].plcp;
 186         /* Zero out flags for this packet */
 187         rate_flags = 0;
 188
 189         /* Set CCK flag as needed */
 190         if ((rate_idx >= IWL_FIRST_CCK_RATE) && (rate_idx <= IWL_LAST_CCK_RATE))
 191                 rate_flags |= RATE_MCS_CCK_MSK;
 192
 193         /* Set up antennas */
 194          if (cfg(priv)->bt_params &&
 195              cfg(priv)->bt_params->advanced_bt_coexist &&
 196              priv->bt_full_concurrent) {
 197                 /* operated as 1x1 in full concurrency mode */
 198                 priv->mgmt_tx_ant = iwl_toggle_tx_ant(priv, priv->mgmt_tx_ant,
 199                                 first_antenna(hw_params(priv).valid_tx_ant));
 200         } else
 201                 priv->mgmt_tx_ant = iwl_toggle_tx_ant(priv, priv->mgmt_tx_ant,
 202                                                 hw_params(priv).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                                       int sta_id)
 214 {
 215         struct ieee80211_key_conf *keyconf = info->control.hw_key;
 216
 217         switch (keyconf->cipher) {
 218         case WLAN_CIPHER_SUITE_CCMP:
 219                 tx_cmd->sec_ctl = TX_CMD_SEC_CCM;
 220                 memcpy(tx_cmd->key, keyconf->key, keyconf->keylen);
 221                 if (info->flags & IEEE80211_TX_CTL_AMPDU)
 222                         tx_cmd->tx_flags |= TX_CMD_FLG_AGG_CCMP_MSK;
 223                 IWL_DEBUG_TX(priv, "tx_cmd with AES hwcrypto\n");
 224                 break;
 225
 226         case WLAN_CIPHER_SUITE_TKIP:
 227                 tx_cmd->sec_ctl = TX_CMD_SEC_TKIP;
 228                 ieee80211_get_tkip_p2k(keyconf, skb_frag, tx_cmd->key);
 229                 IWL_DEBUG_TX(priv, "tx_cmd with tkip hwcrypto\n");
 230                 break;
 231
 232         case WLAN_CIPHER_SUITE_WEP104:
 233                 tx_cmd->sec_ctl |= TX_CMD_SEC_KEY128;
 234                 /* fall through */
 235         case WLAN_CIPHER_SUITE_WEP40:
 236                 tx_cmd->sec_ctl |= (TX_CMD_SEC_WEP |
 237                         (keyconf->keyidx & TX_CMD_SEC_MSK) << TX_CMD_SEC_SHIFT);
 238
 239                 memcpy(&tx_cmd->key[3], keyconf->key, keyconf->keylen);
 240
 241                 IWL_DEBUG_TX(priv, "Configuring packet for WEP encryption "
 242                              "with key %d\n", keyconf->keyidx);
 243                 break;
 244
 245         default:
 246                 IWL_ERR(priv, "Unknown encode cipher %x\n", keyconf->cipher);
 247                 break;
 248         }
 249 }
 250
 251 /*
 252  * start REPLY_TX command process
 253  */
 254 int iwlagn_tx_skb(struct iwl_priv *priv, struct sk_buff *skb)
 255 {
 256         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 257         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 258         struct iwl_station_priv *sta_priv = NULL;
 259         struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
 260         struct iwl_device_cmd *dev_cmd = NULL;
 261         struct iwl_tx_cmd *tx_cmd;
 262
 263         __le16 fc;
 264         u8 hdr_len;
 265         u16 len, seq_number = 0;
 266         u8 sta_id, tid = IWL_MAX_TID_COUNT;
 267         unsigned long flags;
 268         bool is_agg = false;
 269
 270         if (info->control.vif)
 271                 ctx = iwl_rxon_ctx_from_vif(info->control.vif);
 272
 273         spin_lock_irqsave(&priv->shrd->lock, flags);
 274         if (iwl_is_rfkill(priv->shrd)) {
 275                 IWL_DEBUG_DROP(priv, "Dropping - RF KILL\n");
 276                 goto drop_unlock_priv;
 277         }
 278
 279         fc = hdr->frame_control;
 280
 281 #ifdef CONFIG_IWLWIFI_DEBUG
 282         if (ieee80211_is_auth(fc))
 283                 IWL_DEBUG_TX(priv, "Sending AUTH frame\n");
 284         else if (ieee80211_is_assoc_req(fc))
 285                 IWL_DEBUG_TX(priv, "Sending ASSOC frame\n");
 286         else if (ieee80211_is_reassoc_req(fc))
 287                 IWL_DEBUG_TX(priv, "Sending REASSOC frame\n");
 288 #endif
 289
 290         if (unlikely(ieee80211_is_probe_resp(fc))) {
 291                 struct iwl_wipan_noa_data *noa_data =
 292                         rcu_dereference(priv->noa_data);
 293
 294                 if (noa_data &&
 295                     pskb_expand_head(skb, 0, noa_data->length,
 296                                      GFP_ATOMIC) == 0) {
 297                         memcpy(skb_put(skb, noa_data->length),
 298                                noa_data->data, noa_data->length);
 299                         hdr = (struct ieee80211_hdr *)skb->data;
 300                 }
 301         }
 302
 303         hdr_len = ieee80211_hdrlen(fc);
 304
 305         /* For management frames use broadcast id to do not break aggregation */
 306         if (!ieee80211_is_data(fc))
 307                 sta_id = ctx->bcast_sta_id;
 308         else {
 309                 /* Find index into station table for destination station */
 310                 sta_id = iwl_sta_id_or_broadcast(priv, ctx, info->control.sta);
 311                 if (sta_id == IWL_INVALID_STATION) {
 312                         IWL_DEBUG_DROP(priv, "Dropping - INVALID STATION: %pM\n",
 313                                        hdr->addr1);
 314                         goto drop_unlock_priv;
 315                 }
 316         }
 317
 318         IWL_DEBUG_TX(priv, "station Id %d\n", sta_id);
 319
 320         if (info->control.sta)
 321                 sta_priv = (void *)info->control.sta->drv_priv;
 322
 323         if (sta_priv && sta_priv->asleep &&
 324             (info->flags & IEEE80211_TX_CTL_POLL_RESPONSE)) {
 325                 /*
 326                  * This sends an asynchronous command to the device,
 327                  * but we can rely on it being processed before the
 328                  * next frame is processed -- and the next frame to
 329                  * this station is the one that will consume this
 330                  * counter.
 331                  * For now set the counter to just 1 since we do not
 332                  * support uAPSD yet.
 333                  */
 334                 iwl_sta_modify_sleep_tx_count(priv, sta_id, 1);
 335         }
 336
 337         if (info->flags & IEEE80211_TX_CTL_AMPDU)
 338                 is_agg = true;
 339
 340         /* irqs already disabled/saved above when locking priv->shrd->lock */
 341         spin_lock(&priv->shrd->sta_lock);
 342
 343         dev_cmd = kmem_cache_alloc(priv->tx_cmd_pool, GFP_ATOMIC);
 344
 345         if (unlikely(!dev_cmd))
 346                 goto drop_unlock_sta;
 347
 348         memset(dev_cmd, 0, sizeof(*dev_cmd));
 349         tx_cmd = (struct iwl_tx_cmd *) dev_cmd->payload;
 350
 351         /* Total # bytes to be transmitted */
 352         len = (u16)skb->len;
 353         tx_cmd->len = cpu_to_le16(len);
 354
 355         if (info->control.hw_key)
 356                 iwlagn_tx_cmd_build_hwcrypto(priv, info, tx_cmd, skb, sta_id);
 357
 358         /* TODO need this for burst mode later on */
 359         iwlagn_tx_cmd_build_basic(priv, skb, tx_cmd, info, hdr, sta_id);
 360         iwl_dbg_log_tx_data_frame(priv, len, hdr);
 361
 362         iwlagn_tx_cmd_build_rate(priv, tx_cmd, info, fc);
 363
 364         iwl_update_stats(priv, true, fc, len);
 365
 366         memset(&info->status, 0, sizeof(info->status));
 367
 368         info->driver_data[0] = ctx;
 369         info->driver_data[1] = dev_cmd;
 370
 371         if (ieee80211_is_data_qos(fc) && !ieee80211_is_qos_nullfunc(fc)) {
 372                 u8 *qc = NULL;
 373                 struct iwl_tid_data *tid_data;
 374                 qc = ieee80211_get_qos_ctl(hdr);
 375                 tid = qc[0] & IEEE80211_QOS_CTL_TID_MASK;
 376                 if (WARN_ON_ONCE(tid >= IWL_MAX_TID_COUNT))
 377                         goto drop_unlock_sta;
 378                 tid_data = &priv->tid_data[sta_id][tid];
 379
 380                 /* aggregation is on for this <sta,tid> */
 381                 if (info->flags & IEEE80211_TX_CTL_AMPDU &&
 382                     tid_data->agg.state != IWL_AGG_ON) {
 383                         IWL_ERR(priv, "TX_CTL_AMPDU while not in AGG:"
 384                                 " Tx flags = 0x%08x, agg.state = %d",
 385                                 info->flags, tid_data->agg.state);
 386                         IWL_ERR(priv, "sta_id = %d, tid = %d seq_num = %d",
 387                                 sta_id, tid, SEQ_TO_SN(tid_data->seq_number));
 388                         goto drop_unlock_sta;
 389                 }
 390
 391                 /* We can receive packets from the stack in IWL_AGG_{ON,OFF}
 392                  * only. Check this here.
 393                  */
 394                 if (WARN_ONCE(tid_data->agg.state != IWL_AGG_ON &&
 395                     tid_data->agg.state != IWL_AGG_OFF,
 396                     "Tx while agg.state = %d", tid_data->agg.state))
 397                         goto drop_unlock_sta;
 398
 399                 seq_number = tid_data->seq_number;
 400                 seq_number &= IEEE80211_SCTL_SEQ;
 401                 hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
 402                 hdr->seq_ctrl |= cpu_to_le16(seq_number);
 403                 seq_number += 0x10;
 404         }
 405
 406         /* Copy MAC header from skb into command buffer */
 407         memcpy(tx_cmd->hdr, hdr, hdr_len);
 408
 409         if (iwl_trans_tx(trans(priv), skb, dev_cmd, ctx->ctxid, sta_id, tid))
 410                 goto drop_unlock_sta;
 411
 412         if (ieee80211_is_data_qos(fc) && !ieee80211_is_qos_nullfunc(fc) &&
 413             !ieee80211_has_morefrags(fc))
 414                 priv->tid_data[sta_id][tid].seq_number = seq_number;
 415
 416         spin_unlock(&priv->shrd->sta_lock);
 417         spin_unlock_irqrestore(&priv->shrd->lock, flags);
 418
 419         /*
 420          * Avoid atomic ops if it isn't an associated client.
 421          * Also, if this is a packet for aggregation, don't
 422          * increase the counter because the ucode will stop
 423          * aggregation queues when their respective station
 424          * goes to sleep.
 425          */
 426         if (sta_priv && sta_priv->client && !is_agg)
 427                 atomic_inc(&sta_priv->pending_frames);
 428
 429         return 0;
 430
 431 drop_unlock_sta:
 432         if (dev_cmd)
 433                 kmem_cache_free(priv->tx_cmd_pool, dev_cmd);
 434         spin_unlock(&priv->shrd->sta_lock);
 435 drop_unlock_priv:
 436         spin_unlock_irqrestore(&priv->shrd->lock, flags);
 437         return -1;
 438 }
 439
 440 int iwlagn_tx_agg_stop(struct iwl_priv *priv, struct ieee80211_vif *vif,
 441                         struct ieee80211_sta *sta, u16 tid)
 442 {
 443         struct iwl_tid_data *tid_data;
 444         unsigned long flags;
 445         int sta_id;
 446
 447         sta_id = iwl_sta_id(sta);
 448
 449         if (sta_id == IWL_INVALID_STATION) {
 450                 IWL_ERR(priv, "Invalid station for AGG tid %d\n", tid);
 451                 return -ENXIO;
 452         }
 453
 454         spin_lock_irqsave(&priv->shrd->sta_lock, flags);
 455
 456         tid_data = &priv->tid_data[sta_id][tid];
 457
 458         switch (priv->tid_data[sta_id][tid].agg.state) {
 459         case IWL_EMPTYING_HW_QUEUE_ADDBA:
 460                 /*
 461                 * This can happen if the peer stops aggregation
 462                 * again before we've had a chance to drain the
 463                 * queue we selected previously, i.e. before the
 464                 * session was really started completely.
 465                 */
 466                 IWL_DEBUG_HT(priv, "AGG stop before setup done\n");
 467                 goto turn_off;
 468         case IWL_AGG_ON:
 469                 break;
 470         default:
 471                 IWL_WARN(priv, "Stopping AGG while state not ON "
 472                          "or starting for %d on %d (%d)\n", sta_id, tid,
 473                          priv->tid_data[sta_id][tid].agg.state);
 474                 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
 475                 return 0;
 476         }
 477
 478         tid_data->agg.ssn = SEQ_TO_SN(tid_data->seq_number);
 479
 480         /* There are still packets for this RA / TID in the HW */
 481         if (tid_data->agg.ssn != tid_data->next_reclaimed) {
 482                 IWL_DEBUG_TX_QUEUES(priv, "Can't proceed: ssn %d, "
 483                                     "next_recl = %d",
 484                                     tid_data->agg.ssn,
 485                                     tid_data->next_reclaimed);
 486                 priv->tid_data[sta_id][tid].agg.state =
 487                         IWL_EMPTYING_HW_QUEUE_DELBA;
 488                 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
 489                 return 0;
 490         }
 491
 492         IWL_DEBUG_TX_QUEUES(priv, "Can proceed: ssn = next_recl = %d",
 493                             tid_data->agg.ssn);
 494 turn_off:
 495         priv->tid_data[sta_id][tid].agg.state = IWL_AGG_OFF;
 496
 497         /* do not restore/save irqs */
 498         spin_unlock(&priv->shrd->sta_lock);
 499         spin_lock(&priv->shrd->lock);
 500
 501         iwl_trans_tx_agg_disable(trans(priv), sta_id, tid);
 502
 503         spin_unlock_irqrestore(&priv->shrd->lock, flags);
 504
 505         ieee80211_stop_tx_ba_cb_irqsafe(vif, sta->addr, tid);
 506
 507         return 0;
 508 }
 509
 510 int iwlagn_tx_agg_start(struct iwl_priv *priv, struct ieee80211_vif *vif,
 511                         struct ieee80211_sta *sta, u16 tid, u16 *ssn)
 512 {
 513         struct iwl_tid_data *tid_data;
 514         unsigned long flags;
 515         int sta_id;
 516         int ret;
 517
 518         IWL_DEBUG_HT(priv, "TX AGG request on ra = %pM tid = %d\n",
 519                      sta->addr, tid);
 520
 521         sta_id = iwl_sta_id(sta);
 522         if (sta_id == IWL_INVALID_STATION) {
 523                 IWL_ERR(priv, "Start AGG on invalid station\n");
 524                 return -ENXIO;
 525         }
 526         if (unlikely(tid >= IWL_MAX_TID_COUNT))
 527                 return -EINVAL;
 528
 529         if (priv->tid_data[sta_id][tid].agg.state != IWL_AGG_OFF) {
 530                 IWL_ERR(priv, "Start AGG when state is not IWL_AGG_OFF !\n");
 531                 return -ENXIO;
 532         }
 533
 534         ret = iwl_sta_tx_modify_enable_tid(priv, sta_id, tid);
 535         if (ret)
 536                 return ret;
 537
 538         spin_lock_irqsave(&priv->shrd->sta_lock, flags);
 539
 540         tid_data = &priv->tid_data[sta_id][tid];
 541         tid_data->agg.ssn = SEQ_TO_SN(tid_data->seq_number);
 542
 543         *ssn = tid_data->agg.ssn;
 544
 545         ret = iwl_trans_tx_agg_alloc(trans(priv), sta_id, tid);
 546         if (ret) {
 547                 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
 548                 return ret;
 549         }
 550
 551         if (*ssn == tid_data->next_reclaimed) {
 552                 IWL_DEBUG_TX_QUEUES(priv, "Can proceed: ssn = next_recl = %d",
 553                                     tid_data->agg.ssn);
 554                 tid_data->agg.state = IWL_AGG_ON;
 555                 ieee80211_start_tx_ba_cb_irqsafe(vif, sta->addr, tid);
 556         } else {
 557                 IWL_DEBUG_TX_QUEUES(priv, "Can't proceed: ssn %d, "
 558                                     "next_reclaimed = %d",
 559                                     tid_data->agg.ssn,
 560                                     tid_data->next_reclaimed);
 561                 tid_data->agg.state = IWL_EMPTYING_HW_QUEUE_ADDBA;
 562         }
 563
 564         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
 565
 566         return ret;
 567 }
 568
 569 int iwlagn_tx_agg_oper(struct iwl_priv *priv, struct ieee80211_vif *vif,
 570                         struct ieee80211_sta *sta, u16 tid, u8 buf_size)
 571 {
 572         struct iwl_station_priv *sta_priv = (void *) sta->drv_priv;
 573         struct iwl_rxon_context *ctx = iwl_rxon_ctx_from_vif(vif);
 574         unsigned long flags;
 575         u16 ssn;
 576
 577         buf_size = min_t(int, buf_size, LINK_QUAL_AGG_FRAME_LIMIT_DEF);
 578
 579         spin_lock_irqsave(&priv->shrd->sta_lock, flags);
 580         ssn = priv->tid_data[sta_priv->sta_id][tid].agg.ssn;
 581         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
 582
 583         iwl_trans_tx_agg_setup(trans(priv), ctx->ctxid, sta_priv->sta_id, tid,
 584                                buf_size, ssn);
 585
 586         /*
 587          * If the limit is 0, then it wasn't initialised yet,
 588          * use the default. We can do that since we take the
 589          * minimum below, and we don't want to go above our
 590          * default due to hardware restrictions.
 591          */
 592         if (sta_priv->max_agg_bufsize == 0)
 593                 sta_priv->max_agg_bufsize =
 594                         LINK_QUAL_AGG_FRAME_LIMIT_DEF;
 595
 596         /*
 597          * Even though in theory the peer could have different
 598          * aggregation reorder buffer sizes for different sessions,
 599          * our ucode doesn't allow for that and has a global limit
 600          * for each station. Therefore, use the minimum of all the
 601          * aggregation sessions and our default value.
 602          */
 603         sta_priv->max_agg_bufsize =
 604                 min(sta_priv->max_agg_bufsize, buf_size);
 605
 606         if (cfg(priv)->ht_params &&
 607             cfg(priv)->ht_params->use_rts_for_aggregation) {
 608                 /*
 609                  * switch to RTS/CTS if it is the prefer protection
 610                  * method for HT traffic
 611                  */
 612
 613                 sta_priv->lq_sta.lq.general_params.flags |=
 614                         LINK_QUAL_FLAGS_SET_STA_TLC_RTS_MSK;
 615         }
 616         priv->agg_tids_count++;
 617         IWL_DEBUG_HT(priv, "priv->agg_tids_count = %u\n",
 618                      priv->agg_tids_count);
 619
 620         sta_priv->lq_sta.lq.agg_params.agg_frame_cnt_limit =
 621                 sta_priv->max_agg_bufsize;
 622
 623         IWL_INFO(priv, "Tx aggregation enabled on ra = %pM tid = %d\n",
 624                  sta->addr, tid);
 625
 626         return iwl_send_lq_cmd(priv, ctx,
 627                         &sta_priv->lq_sta.lq, CMD_ASYNC, false);
 628 }
 629
 630 static void iwlagn_check_ratid_empty(struct iwl_priv *priv, int sta_id, u8 tid)
 631 {
 632         struct iwl_tid_data *tid_data = &priv->tid_data[sta_id][tid];
 633         enum iwl_rxon_context_id ctx;
 634         struct ieee80211_vif *vif;
 635         u8 *addr;
 636
 637         lockdep_assert_held(&priv->shrd->sta_lock);
 638
 639         addr = priv->stations[sta_id].sta.sta.addr;
 640         ctx = priv->stations[sta_id].ctxid;
 641         vif = priv->contexts[ctx].vif;
 642
 643         switch (priv->tid_data[sta_id][tid].agg.state) {
 644         case IWL_EMPTYING_HW_QUEUE_DELBA:
 645                 /* There are no packets for this RA / TID in the HW any more */
 646                 if (tid_data->agg.ssn == tid_data->next_reclaimed) {
 647                         IWL_DEBUG_TX_QUEUES(priv,
 648                                 "Can continue DELBA flow ssn = next_recl ="
 649                                 " %d", tid_data->next_reclaimed);
 650                         iwl_trans_tx_agg_disable(trans(priv), sta_id, tid);
 651                         tid_data->agg.state = IWL_AGG_OFF;
 652                         ieee80211_stop_tx_ba_cb_irqsafe(vif, addr, tid);
 653                 }
 654                 break;
 655         case IWL_EMPTYING_HW_QUEUE_ADDBA:
 656                 /* There are no packets for this RA / TID in the HW any more */
 657                 if (tid_data->agg.ssn == tid_data->next_reclaimed) {
 658                         IWL_DEBUG_TX_QUEUES(priv,
 659                                 "Can continue ADDBA flow ssn = next_recl ="
 660                                 " %d", tid_data->next_reclaimed);
 661                         tid_data->agg.state = IWL_AGG_ON;
 662                         ieee80211_start_tx_ba_cb_irqsafe(vif, addr, tid);
 663                 }
 664                 break;
 665         default:
 666                 break;
 667         }
 668 }
 669
 670 static void iwlagn_non_agg_tx_status(struct iwl_priv *priv,
 671                                      struct iwl_rxon_context *ctx,
 672                                      const u8 *addr1)
 673 {
 674         struct ieee80211_sta *sta;
 675         struct iwl_station_priv *sta_priv;
 676
 677         rcu_read_lock();
 678         sta = ieee80211_find_sta(ctx->vif, addr1);
 679         if (sta) {
 680                 sta_priv = (void *)sta->drv_priv;
 681                 /* avoid atomic ops if this isn't a client */
 682                 if (sta_priv->client &&
 683                     atomic_dec_return(&sta_priv->pending_frames) == 0)
 684                         ieee80211_sta_block_awake(priv->hw, sta, false);
 685         }
 686         rcu_read_unlock();
 687 }
 688
 689 /**
 690  * translate ucode response to mac80211 tx status control values
 691  */
 692 static void iwlagn_hwrate_to_tx_control(struct iwl_priv *priv, u32 rate_n_flags,
 693                                   struct ieee80211_tx_info *info)
 694 {
 695         struct ieee80211_tx_rate *r = &info->control.rates[0];
 696
 697         info->antenna_sel_tx =
 698                 ((rate_n_flags & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS);
 699         if (rate_n_flags & RATE_MCS_HT_MSK)
 700                 r->flags |= IEEE80211_TX_RC_MCS;
 701         if (rate_n_flags & RATE_MCS_GF_MSK)
 702                 r->flags |= IEEE80211_TX_RC_GREEN_FIELD;
 703         if (rate_n_flags & RATE_MCS_HT40_MSK)
 704                 r->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
 705         if (rate_n_flags & RATE_MCS_DUP_MSK)
 706                 r->flags |= IEEE80211_TX_RC_DUP_DATA;
 707         if (rate_n_flags & RATE_MCS_SGI_MSK)
 708                 r->flags |= IEEE80211_TX_RC_SHORT_GI;
 709         r->idx = iwlagn_hwrate_to_mac80211_idx(rate_n_flags, info->band);
 710 }
 711
 712 #ifdef CONFIG_IWLWIFI_DEBUG
 713 const char *iwl_get_tx_fail_reason(u32 status)
 714 {
 715 #define TX_STATUS_FAIL(x) case TX_STATUS_FAIL_ ## x: return #x
 716 #define TX_STATUS_POSTPONE(x) case TX_STATUS_POSTPONE_ ## x: return #x
 717
 718         switch (status & TX_STATUS_MSK) {
 719         case TX_STATUS_SUCCESS:
 720                 return "SUCCESS";
 721         TX_STATUS_POSTPONE(DELAY);
 722         TX_STATUS_POSTPONE(FEW_BYTES);
 723         TX_STATUS_POSTPONE(BT_PRIO);
 724         TX_STATUS_POSTPONE(QUIET_PERIOD);
 725         TX_STATUS_POSTPONE(CALC_TTAK);
 726         TX_STATUS_FAIL(INTERNAL_CROSSED_RETRY);
 727         TX_STATUS_FAIL(SHORT_LIMIT);
 728         TX_STATUS_FAIL(LONG_LIMIT);
 729         TX_STATUS_FAIL(FIFO_UNDERRUN);
 730         TX_STATUS_FAIL(DRAIN_FLOW);
 731         TX_STATUS_FAIL(RFKILL_FLUSH);
 732         TX_STATUS_FAIL(LIFE_EXPIRE);
 733         TX_STATUS_FAIL(DEST_PS);
 734         TX_STATUS_FAIL(HOST_ABORTED);
 735         TX_STATUS_FAIL(BT_RETRY);
 736         TX_STATUS_FAIL(STA_INVALID);
 737         TX_STATUS_FAIL(FRAG_DROPPED);
 738         TX_STATUS_FAIL(TID_DISABLE);
 739         TX_STATUS_FAIL(FIFO_FLUSHED);
 740         TX_STATUS_FAIL(INSUFFICIENT_CF_POLL);
 741         TX_STATUS_FAIL(PASSIVE_NO_RX);
 742         TX_STATUS_FAIL(NO_BEACON_ON_RADAR);
 743         }
 744
 745         return "UNKNOWN";
 746
 747 #undef TX_STATUS_FAIL
 748 #undef TX_STATUS_POSTPONE
 749 }
 750 #endif /* CONFIG_IWLWIFI_DEBUG */
 751
 752 static void iwlagn_count_agg_tx_err_status(struct iwl_priv *priv, u16 status)
 753 {
 754         status &= AGG_TX_STATUS_MSK;
 755
 756         switch (status) {
 757         case AGG_TX_STATE_UNDERRUN_MSK:
 758                 priv->reply_agg_tx_stats.underrun++;
 759                 break;
 760         case AGG_TX_STATE_BT_PRIO_MSK:
 761                 priv->reply_agg_tx_stats.bt_prio++;
 762                 break;
 763         case AGG_TX_STATE_FEW_BYTES_MSK:
 764                 priv->reply_agg_tx_stats.few_bytes++;
 765                 break;
 766         case AGG_TX_STATE_ABORT_MSK:
 767                 priv->reply_agg_tx_stats.abort++;
 768                 break;
 769         case AGG_TX_STATE_LAST_SENT_TTL_MSK:
 770                 priv->reply_agg_tx_stats.last_sent_ttl++;
 771                 break;
 772         case AGG_TX_STATE_LAST_SENT_TRY_CNT_MSK:
 773                 priv->reply_agg_tx_stats.last_sent_try++;
 774                 break;
 775         case AGG_TX_STATE_LAST_SENT_BT_KILL_MSK:
 776                 priv->reply_agg_tx_stats.last_sent_bt_kill++;
 777                 break;
 778         case AGG_TX_STATE_SCD_QUERY_MSK:
 779                 priv->reply_agg_tx_stats.scd_query++;
 780                 break;
 781         case AGG_TX_STATE_TEST_BAD_CRC32_MSK:
 782                 priv->reply_agg_tx_stats.bad_crc32++;
 783                 break;
 784         case AGG_TX_STATE_RESPONSE_MSK:
 785                 priv->reply_agg_tx_stats.response++;
 786                 break;
 787         case AGG_TX_STATE_DUMP_TX_MSK:
 788                 priv->reply_agg_tx_stats.dump_tx++;
 789                 break;
 790         case AGG_TX_STATE_DELAY_TX_MSK:
 791                 priv->reply_agg_tx_stats.delay_tx++;
 792                 break;
 793         default:
 794                 priv->reply_agg_tx_stats.unknown++;
 795                 break;
 796         }
 797 }
 798
 799 static void iwl_rx_reply_tx_agg(struct iwl_priv *priv,
 800                                 struct iwlagn_tx_resp *tx_resp)
 801 {
 802         struct agg_tx_status *frame_status = &tx_resp->status;
 803         int tid = (tx_resp->ra_tid & IWLAGN_TX_RES_TID_MSK) >>
 804                 IWLAGN_TX_RES_TID_POS;
 805         int sta_id = (tx_resp->ra_tid & IWLAGN_TX_RES_RA_MSK) >>
 806                 IWLAGN_TX_RES_RA_POS;
 807         struct iwl_ht_agg *agg = &priv->tid_data[sta_id][tid].agg;
 808         u32 status = le16_to_cpu(tx_resp->status.status);
 809         int i;
 810
 811         if (agg->wait_for_ba)
 812                 IWL_DEBUG_TX_REPLY(priv,
 813                         "got tx response w/o block-ack\n");
 814
 815         agg->rate_n_flags = le32_to_cpu(tx_resp->rate_n_flags);
 816         agg->wait_for_ba = (tx_resp->frame_count > 1);
 817
 818         /*
 819          * If the BT kill count is non-zero, we'll get this
 820          * notification again.
 821          */
 822         if (tx_resp->bt_kill_count && tx_resp->frame_count == 1 &&
 823             cfg(priv)->bt_params &&
 824             cfg(priv)->bt_params->advanced_bt_coexist) {
 825                 IWL_DEBUG_COEX(priv, "receive reply tx w/ bt_kill\n");
 826         }
 827
 828         if (tx_resp->frame_count == 1)
 829                 return;
 830
 831         /* Construct bit-map of pending frames within Tx window */
 832         for (i = 0; i < tx_resp->frame_count; i++) {
 833                 u16 fstatus = le16_to_cpu(frame_status[i].status);
 834
 835                 if (status & AGG_TX_STATUS_MSK)
 836                         iwlagn_count_agg_tx_err_status(priv, fstatus);
 837
 838                 if (status & (AGG_TX_STATE_FEW_BYTES_MSK |
 839                               AGG_TX_STATE_ABORT_MSK))
 840                         continue;
 841
 842                 IWL_DEBUG_TX_REPLY(priv, "status %s (0x%08x), "
 843                                    "try-count (0x%08x)\n",
 844                                    iwl_get_agg_tx_fail_reason(fstatus),
 845                                    fstatus & AGG_TX_STATUS_MSK,
 846                                    fstatus & AGG_TX_TRY_MSK);
 847         }
 848 }
 849
 850 #ifdef CONFIG_IWLWIFI_DEBUG
 851 #define AGG_TX_STATE_FAIL(x) case AGG_TX_STATE_ ## x: return #x
 852
 853 const char *iwl_get_agg_tx_fail_reason(u16 status)
 854 {
 855         status &= AGG_TX_STATUS_MSK;
 856         switch (status) {
 857         case AGG_TX_STATE_TRANSMITTED:
 858                 return "SUCCESS";
 859                 AGG_TX_STATE_FAIL(UNDERRUN_MSK);
 860                 AGG_TX_STATE_FAIL(BT_PRIO_MSK);
 861                 AGG_TX_STATE_FAIL(FEW_BYTES_MSK);
 862                 AGG_TX_STATE_FAIL(ABORT_MSK);
 863                 AGG_TX_STATE_FAIL(LAST_SENT_TTL_MSK);
 864                 AGG_TX_STATE_FAIL(LAST_SENT_TRY_CNT_MSK);
 865                 AGG_TX_STATE_FAIL(LAST_SENT_BT_KILL_MSK);
 866                 AGG_TX_STATE_FAIL(SCD_QUERY_MSK);
 867                 AGG_TX_STATE_FAIL(TEST_BAD_CRC32_MSK);
 868                 AGG_TX_STATE_FAIL(RESPONSE_MSK);
 869                 AGG_TX_STATE_FAIL(DUMP_TX_MSK);
 870                 AGG_TX_STATE_FAIL(DELAY_TX_MSK);
 871         }
 872
 873         return "UNKNOWN";
 874 }
 875 #endif /* CONFIG_IWLWIFI_DEBUG */
 876
 877 static inline u32 iwlagn_get_scd_ssn(struct iwlagn_tx_resp *tx_resp)
 878 {
 879         return le32_to_cpup((__le32 *)&tx_resp->status +
 880                             tx_resp->frame_count) & MAX_SN;
 881 }
 882
 883 static void iwlagn_count_tx_err_status(struct iwl_priv *priv, u16 status)
 884 {
 885         status &= TX_STATUS_MSK;
 886
 887         switch (status) {
 888         case TX_STATUS_POSTPONE_DELAY:
 889                 priv->reply_tx_stats.pp_delay++;
 890                 break;
 891         case TX_STATUS_POSTPONE_FEW_BYTES:
 892                 priv->reply_tx_stats.pp_few_bytes++;
 893                 break;
 894         case TX_STATUS_POSTPONE_BT_PRIO:
 895                 priv->reply_tx_stats.pp_bt_prio++;
 896                 break;
 897         case TX_STATUS_POSTPONE_QUIET_PERIOD:
 898                 priv->reply_tx_stats.pp_quiet_period++;
 899                 break;
 900         case TX_STATUS_POSTPONE_CALC_TTAK:
 901                 priv->reply_tx_stats.pp_calc_ttak++;
 902                 break;
 903         case TX_STATUS_FAIL_INTERNAL_CROSSED_RETRY:
 904                 priv->reply_tx_stats.int_crossed_retry++;
 905                 break;
 906         case TX_STATUS_FAIL_SHORT_LIMIT:
 907                 priv->reply_tx_stats.short_limit++;
 908                 break;
 909         case TX_STATUS_FAIL_LONG_LIMIT:
 910                 priv->reply_tx_stats.long_limit++;
 911                 break;
 912         case TX_STATUS_FAIL_FIFO_UNDERRUN:
 913                 priv->reply_tx_stats.fifo_underrun++;
 914                 break;
 915         case TX_STATUS_FAIL_DRAIN_FLOW:
 916                 priv->reply_tx_stats.drain_flow++;
 917                 break;
 918         case TX_STATUS_FAIL_RFKILL_FLUSH:
 919                 priv->reply_tx_stats.rfkill_flush++;
 920                 break;
 921         case TX_STATUS_FAIL_LIFE_EXPIRE:
 922                 priv->reply_tx_stats.life_expire++;
 923                 break;
 924         case TX_STATUS_FAIL_DEST_PS:
 925                 priv->reply_tx_stats.dest_ps++;
 926                 break;
 927         case TX_STATUS_FAIL_HOST_ABORTED:
 928                 priv->reply_tx_stats.host_abort++;
 929                 break;
 930         case TX_STATUS_FAIL_BT_RETRY:
 931                 priv->reply_tx_stats.bt_retry++;
 932                 break;
 933         case TX_STATUS_FAIL_STA_INVALID:
 934                 priv->reply_tx_stats.sta_invalid++;
 935                 break;
 936         case TX_STATUS_FAIL_FRAG_DROPPED:
 937                 priv->reply_tx_stats.frag_drop++;
 938                 break;
 939         case TX_STATUS_FAIL_TID_DISABLE:
 940                 priv->reply_tx_stats.tid_disable++;
 941                 break;
 942         case TX_STATUS_FAIL_FIFO_FLUSHED:
 943                 priv->reply_tx_stats.fifo_flush++;
 944                 break;
 945         case TX_STATUS_FAIL_INSUFFICIENT_CF_POLL:
 946                 priv->reply_tx_stats.insuff_cf_poll++;
 947                 break;
 948         case TX_STATUS_FAIL_PASSIVE_NO_RX:
 949                 priv->reply_tx_stats.fail_hw_drop++;
 950                 break;
 951         case TX_STATUS_FAIL_NO_BEACON_ON_RADAR:
 952                 priv->reply_tx_stats.sta_color_mismatch++;
 953                 break;
 954         default:
 955                 priv->reply_tx_stats.unknown++;
 956                 break;
 957         }
 958 }
 959
 960 static void iwlagn_set_tx_status(struct iwl_priv *priv,
 961                                  struct ieee80211_tx_info *info,
 962                                  struct iwlagn_tx_resp *tx_resp,
 963                                  bool is_agg)
 964 {
 965         u16  status = le16_to_cpu(tx_resp->status.status);
 966
 967         info->status.rates[0].count = tx_resp->failure_frame + 1;
 968         if (is_agg)
 969                 info->flags &= ~IEEE80211_TX_CTL_AMPDU;
 970         info->flags |= iwl_tx_status_to_mac80211(status);
 971         iwlagn_hwrate_to_tx_control(priv, le32_to_cpu(tx_resp->rate_n_flags),
 972                                     info);
 973         if (!iwl_is_tx_success(status))
 974                 iwlagn_count_tx_err_status(priv, status);
 975 }
 976
 977 static void iwl_check_abort_status(struct iwl_priv *priv,
 978                             u8 frame_count, u32 status)
 979 {
 980         if (frame_count == 1 && status == TX_STATUS_FAIL_RFKILL_FLUSH) {
 981                 IWL_ERR(priv, "Tx flush command to flush out all frames\n");
 982                 if (!test_bit(STATUS_EXIT_PENDING, &priv->shrd->status))
 983                         queue_work(priv->shrd->workqueue, &priv->tx_flush);
 984         }
 985 }
 986
 987 int iwlagn_rx_reply_tx(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb,
 988                                struct iwl_device_cmd *cmd)
 989 {
 990         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 991         u16 sequence = le16_to_cpu(pkt->hdr.sequence);
 992         int txq_id = SEQ_TO_QUEUE(sequence);
 993         int cmd_index __maybe_unused = SEQ_TO_INDEX(sequence);
 994         struct iwlagn_tx_resp *tx_resp = (void *)&pkt->u.raw[0];
 995         struct ieee80211_hdr *hdr;
 996         u32 status = le16_to_cpu(tx_resp->status.status);
 997         u16 ssn = iwlagn_get_scd_ssn(tx_resp);
 998         int tid;
 999         int sta_id;
1000         int freed;
1001         struct ieee80211_tx_info *info;
1002         unsigned long flags;
1003         struct sk_buff_head skbs;
1004         struct sk_buff *skb;
1005         struct iwl_rxon_context *ctx;
1006         bool is_agg = (txq_id >= IWLAGN_FIRST_AMPDU_QUEUE);
1007
1008         tid = (tx_resp->ra_tid & IWLAGN_TX_RES_TID_MSK) >>
1009                 IWLAGN_TX_RES_TID_POS;
1010         sta_id = (tx_resp->ra_tid & IWLAGN_TX_RES_RA_MSK) >>
1011                 IWLAGN_TX_RES_RA_POS;
1012
1013         spin_lock_irqsave(&priv->shrd->sta_lock, flags);
1014
1015         if (is_agg)
1016                 iwl_rx_reply_tx_agg(priv, tx_resp);
1017
1018         if (tx_resp->frame_count == 1) {
1019                 u16 next_reclaimed = le16_to_cpu(tx_resp->seq_ctl);
1020                 next_reclaimed = SEQ_TO_SN(next_reclaimed + 0x10);
1021
1022                 if (is_agg) {
1023                         /* If this is an aggregation queue, we can rely on the
1024                          * ssn since the wifi sequence number corresponds to
1025                          * the index in the TFD ring (%256).
1026                          * The seq_ctl is the sequence control of the packet
1027                          * to which this Tx response relates. But if there is a
1028                          * hole in the bitmap of the BA we received, this Tx
1029                          * response may allow to reclaim the hole and all the
1030                          * subsequent packets that were already acked.
1031                          * In that case, seq_ctl != ssn, and the next packet
1032                          * to be reclaimed will be ssn and not seq_ctl.
1033                          */
1034                         next_reclaimed = ssn;
1035                 }
1036
1037                 __skb_queue_head_init(&skbs);
1038                 priv->tid_data[sta_id][tid].next_reclaimed = next_reclaimed;
1039
1040                 IWL_DEBUG_TX_REPLY(priv, "Next reclaimed packet:%d",
1041                                           next_reclaimed);
1042
1043                 /*we can free until ssn % q.n_bd not inclusive */
1044                 WARN_ON(iwl_trans_reclaim(trans(priv), sta_id, tid, txq_id,
1045                                   ssn, status, &skbs));
1046                 iwlagn_check_ratid_empty(priv, sta_id, tid);
1047                 freed = 0;
1048                 while (!skb_queue_empty(&skbs)) {
1049                         skb = __skb_dequeue(&skbs);
1050                         hdr = (struct ieee80211_hdr *)skb->data;
1051
1052                         if (!ieee80211_is_data_qos(hdr->frame_control))
1053                                 priv->last_seq_ctl = tx_resp->seq_ctl;
1054
1055                         info = IEEE80211_SKB_CB(skb);
1056                         ctx = info->driver_data[0];
1057                         kmem_cache_free(priv->tx_cmd_pool,
1058                                         (info->driver_data[1]));
1059
1060                         memset(&info->status, 0, sizeof(info->status));
1061
1062                         if (status == TX_STATUS_FAIL_PASSIVE_NO_RX &&
1063                             iwl_is_associated_ctx(ctx) && ctx->vif &&
1064                             ctx->vif->type == NL80211_IFTYPE_STATION) {
1065                                 ctx->last_tx_rejected = true;
1066                                 iwl_trans_stop_queue(trans(priv), txq_id,
1067                                         "Tx on passive channel");
1068
1069                                 IWL_DEBUG_TX_REPLY(priv,
1070                                            "TXQ %d status %s (0x%08x) "
1071                                            "rate_n_flags 0x%x retries %d\n",
1072                                            txq_id,
1073                                            iwl_get_tx_fail_reason(status),
1074                                            status,
1075                                            le32_to_cpu(tx_resp->rate_n_flags),
1076                                            tx_resp->failure_frame);
1077
1078                                 IWL_DEBUG_TX_REPLY(priv,
1079                                            "FrameCnt = %d, idx=%d\n",
1080                                            tx_resp->frame_count, cmd_index);
1081                         }
1082
1083                         /* check if BAR is needed */
1084                         if (is_agg && !iwl_is_tx_success(status))
1085                                 info->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK;
1086                         iwlagn_set_tx_status(priv, IEEE80211_SKB_CB(skb),
1087                                      tx_resp, is_agg);
1088                         if (!is_agg)
1089                                 iwlagn_non_agg_tx_status(priv, ctx, hdr->addr1);
1090
1091                         ieee80211_tx_status_irqsafe(priv->hw, skb);
1092
1093                         freed++;
1094                 }
1095
1096                 WARN_ON(!is_agg && freed != 1);
1097         }
1098
1099         iwl_check_abort_status(priv, tx_resp->frame_count, status);
1100         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
1101         return 0;
1102 }
1103
1104 /**
1105  * iwlagn_rx_reply_compressed_ba - Handler for REPLY_COMPRESSED_BA
1106  *
1107  * Handles block-acknowledge notification from device, which reports success
1108  * of frames sent via aggregation.
1109  */
1110 int iwlagn_rx_reply_compressed_ba(struct iwl_priv *priv,
1111                                    struct iwl_rx_mem_buffer *rxb,
1112                                    struct iwl_device_cmd *cmd)
1113 {
1114         struct iwl_rx_packet *pkt = rxb_addr(rxb);
1115         struct iwl_compressed_ba_resp *ba_resp = &pkt->u.compressed_ba;
1116         struct iwl_ht_agg *agg;
1117         struct sk_buff_head reclaimed_skbs;
1118         struct ieee80211_tx_info *info;
1119         struct ieee80211_hdr *hdr;
1120         struct sk_buff *skb;
1121         unsigned long flags;
1122         int sta_id;
1123         int tid;
1124         int freed;
1125
1126         /* "flow" corresponds to Tx queue */
1127         u16 scd_flow = le16_to_cpu(ba_resp->scd_flow);
1128
1129         /* "ssn" is start of block-ack Tx window, corresponds to index
1130          * (in Tx queue's circular buffer) of first TFD/frame in window */
1131         u16 ba_resp_scd_ssn = le16_to_cpu(ba_resp->scd_ssn);
1132
1133         if (scd_flow >= hw_params(priv).max_txq_num) {
1134                 IWL_ERR(priv,
1135                         "BUG_ON scd_flow is bigger than number of queues\n");
1136                 return 0;
1137         }
1138
1139         sta_id = ba_resp->sta_id;
1140         tid = ba_resp->tid;
1141         agg = &priv->tid_data[sta_id][tid].agg;
1142
1143         spin_lock_irqsave(&priv->shrd->sta_lock, flags);
1144
1145         if (unlikely(!agg->wait_for_ba)) {
1146                 if (unlikely(ba_resp->bitmap))
1147                         IWL_ERR(priv, "Received BA when not expected\n");
1148                 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
1149                 return 0;
1150         }
1151
1152         __skb_queue_head_init(&reclaimed_skbs);
1153
1154         /* Release all TFDs before the SSN, i.e. all TFDs in front of
1155          * block-ack window (we assume that they've been successfully
1156          * transmitted ... if not, it's too late anyway). */
1157         if (iwl_trans_reclaim(trans(priv), sta_id, tid, scd_flow,
1158                               ba_resp_scd_ssn, 0, &reclaimed_skbs)) {
1159                 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
1160                 return 0;
1161         }
1162
1163         IWL_DEBUG_TX_REPLY(priv, "REPLY_COMPRESSED_BA [%d] Received from %pM, "
1164                            "sta_id = %d\n",
1165                            agg->wait_for_ba,
1166                            (u8 *) &ba_resp->sta_addr_lo32,
1167                            ba_resp->sta_id);
1168         IWL_DEBUG_TX_REPLY(priv, "TID = %d, SeqCtl = %d, bitmap = 0x%llx, "
1169                            "scd_flow = %d, scd_ssn = %d\n",
1170                            ba_resp->tid, le16_to_cpu(ba_resp->seq_ctl),
1171                            (unsigned long long)le64_to_cpu(ba_resp->bitmap),
1172                            scd_flow, ba_resp_scd_ssn);
1173
1174         /* Mark that the expected block-ack response arrived */
1175         agg->wait_for_ba = false;
1176
1177         /* Sanity check values reported by uCode */
1178         if (ba_resp->txed_2_done > ba_resp->txed) {
1179                 IWL_DEBUG_TX_REPLY(priv,
1180                         "bogus sent(%d) and ack(%d) count\n",
1181                         ba_resp->txed, ba_resp->txed_2_done);
1182                 /*
1183                  * set txed_2_done = txed,
1184                  * so it won't impact rate scale
1185                  */
1186                 ba_resp->txed = ba_resp->txed_2_done;
1187         }
1188         IWL_DEBUG_HT(priv, "agg frames sent:%d, acked:%d\n",
1189                         ba_resp->txed, ba_resp->txed_2_done);
1190
1191         priv->tid_data[sta_id][tid].next_reclaimed = ba_resp_scd_ssn;
1192
1193         iwlagn_check_ratid_empty(priv, sta_id, tid);
1194         freed = 0;
1195         while (!skb_queue_empty(&reclaimed_skbs)) {
1196
1197                 skb = __skb_dequeue(&reclaimed_skbs);
1198                 hdr = (struct ieee80211_hdr *)skb->data;
1199
1200                 if (ieee80211_is_data_qos(hdr->frame_control))
1201                         freed++;
1202                 else
1203                         WARN_ON_ONCE(1);
1204
1205                 info = IEEE80211_SKB_CB(skb);
1206                 kmem_cache_free(priv->tx_cmd_pool, (info->driver_data[1]));
1207
1208                 if (freed == 1) {
1209                         /* this is the first skb we deliver in this batch */
1210                         /* put the rate scaling data there */
1211                         info = IEEE80211_SKB_CB(skb);
1212                         memset(&info->status, 0, sizeof(info->status));
1213                         info->flags |= IEEE80211_TX_STAT_ACK;
1214                         info->flags |= IEEE80211_TX_STAT_AMPDU;
1215                         info->status.ampdu_ack_len = ba_resp->txed_2_done;
1216                         info->status.ampdu_len = ba_resp->txed;
1217                         iwlagn_hwrate_to_tx_control(priv, agg->rate_n_flags,
1218                                                     info);
1219                 }
1220
1221                 ieee80211_tx_status_irqsafe(priv->hw, skb);
1222         }
1223
1224         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
1225         return 0;
1226 }