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->shrd->tid_data[sta_id][tid];
 379
 380                 seq_number = tid_data->seq_number;
 381                 seq_number &= IEEE80211_SCTL_SEQ;
 382                 hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
 383                 hdr->seq_ctrl |= cpu_to_le16(seq_number);
 384                 seq_number += 0x10;
 385         }
 386
 387         /* Copy MAC header from skb into command buffer */
 388         memcpy(tx_cmd->hdr, hdr, hdr_len);
 389
 390         if (iwl_trans_tx(trans(priv), skb, dev_cmd, ctx->ctxid, sta_id, tid))
 391                 goto drop_unlock_sta;
 392
 393         if (ieee80211_is_data_qos(fc) && !ieee80211_is_qos_nullfunc(fc) &&
 394             !ieee80211_has_morefrags(fc))
 395                 priv->shrd->tid_data[sta_id][tid].seq_number =
 396                                 seq_number;
 397
 398         spin_unlock(&priv->shrd->sta_lock);
 399         spin_unlock_irqrestore(&priv->shrd->lock, flags);
 400
 401         /*
 402          * Avoid atomic ops if it isn't an associated client.
 403          * Also, if this is a packet for aggregation, don't
 404          * increase the counter because the ucode will stop
 405          * aggregation queues when their respective station
 406          * goes to sleep.
 407          */
 408         if (sta_priv && sta_priv->client && !is_agg)
 409                 atomic_inc(&sta_priv->pending_frames);
 410
 411         return 0;
 412
 413 drop_unlock_sta:
 414         if (dev_cmd)
 415                 kmem_cache_free(priv->tx_cmd_pool, dev_cmd);
 416         spin_unlock(&priv->shrd->sta_lock);
 417 drop_unlock_priv:
 418         spin_unlock_irqrestore(&priv->shrd->lock, flags);
 419         return -1;
 420 }
 421
 422 int iwlagn_tx_agg_stop(struct iwl_priv *priv, struct ieee80211_vif *vif,
 423                         struct ieee80211_sta *sta, u16 tid)
 424 {
 425         struct iwl_vif_priv *vif_priv = (void *)vif->drv_priv;
 426         struct iwl_tid_data *tid_data;
 427         unsigned long flags;
 428         int sta_id;
 429
 430         sta_id = iwl_sta_id(sta);
 431
 432         if (sta_id == IWL_INVALID_STATION) {
 433                 IWL_ERR(priv, "Invalid station for AGG tid %d\n", tid);
 434                 return -ENXIO;
 435         }
 436
 437         spin_lock_irqsave(&priv->shrd->sta_lock, flags);
 438
 439         tid_data = &priv->shrd->tid_data[sta_id][tid];
 440
 441         switch (priv->shrd->tid_data[sta_id][tid].agg.state) {
 442         case IWL_EMPTYING_HW_QUEUE_ADDBA:
 443                 /*
 444                 * This can happen if the peer stops aggregation
 445                 * again before we've had a chance to drain the
 446                 * queue we selected previously, i.e. before the
 447                 * session was really started completely.
 448                 */
 449                 IWL_DEBUG_HT(priv, "AGG stop before setup done\n");
 450                 goto turn_off;
 451         case IWL_AGG_ON:
 452                 break;
 453         default:
 454                 IWL_WARN(priv, "Stopping AGG while state not ON "
 455                          "or starting for %d on %d (%d)\n", sta_id, tid,
 456                          priv->shrd->tid_data[sta_id][tid].agg.state);
 457                 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
 458                 return 0;
 459         }
 460
 461         tid_data->agg.ssn = SEQ_TO_SN(tid_data->seq_number);
 462
 463         /* There are still packets for this RA / TID in the HW */
 464         if (tid_data->agg.ssn != tid_data->next_reclaimed) {
 465                 IWL_DEBUG_TX_QUEUES(priv, "Can't proceed: ssn %d, "
 466                                     "next_recl = %d",
 467                                     tid_data->agg.ssn,
 468                                     tid_data->next_reclaimed);
 469                 priv->shrd->tid_data[sta_id][tid].agg.state =
 470                         IWL_EMPTYING_HW_QUEUE_DELBA;
 471                 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
 472                 return 0;
 473         }
 474
 475         IWL_DEBUG_TX_QUEUES(priv, "Can proceed: ssn = next_recl = %d",
 476                             tid_data->agg.ssn);
 477 turn_off:
 478         priv->shrd->tid_data[sta_id][tid].agg.state = IWL_AGG_OFF;
 479
 480         /* do not restore/save irqs */
 481         spin_unlock(&priv->shrd->sta_lock);
 482         spin_lock(&priv->shrd->lock);
 483
 484         iwl_trans_tx_agg_disable(trans(priv), sta_id, tid);
 485
 486         spin_unlock_irqrestore(&priv->shrd->lock, flags);
 487
 488         iwl_stop_tx_ba_trans_ready(priv, vif_priv->ctx->ctxid, sta_id, tid);
 489
 490         return 0;
 491 }
 492
 493 int iwlagn_tx_agg_start(struct iwl_priv *priv, struct ieee80211_vif *vif,
 494                         struct ieee80211_sta *sta, u16 tid, u16 *ssn)
 495 {
 496         struct iwl_vif_priv *vif_priv = (void *)vif->drv_priv;
 497         struct iwl_tid_data *tid_data;
 498         unsigned long flags;
 499         int sta_id;
 500         int ret;
 501
 502         IWL_DEBUG_HT(priv, "TX AGG request on ra = %pM tid = %d\n",
 503                      sta->addr, tid);
 504
 505         sta_id = iwl_sta_id(sta);
 506         if (sta_id == IWL_INVALID_STATION) {
 507                 IWL_ERR(priv, "Start AGG on invalid station\n");
 508                 return -ENXIO;
 509         }
 510         if (unlikely(tid >= IWL_MAX_TID_COUNT))
 511                 return -EINVAL;
 512
 513         if (priv->shrd->tid_data[sta_id][tid].agg.state != IWL_AGG_OFF) {
 514                 IWL_ERR(priv, "Start AGG when state is not IWL_AGG_OFF !\n");
 515                 return -ENXIO;
 516         }
 517
 518         ret = iwl_sta_tx_modify_enable_tid(priv, sta_id, tid);
 519         if (ret)
 520                 return ret;
 521
 522         spin_lock_irqsave(&priv->shrd->sta_lock, flags);
 523
 524         tid_data = &priv->shrd->tid_data[sta_id][tid];
 525         tid_data->agg.ssn = SEQ_TO_SN(tid_data->seq_number);
 526
 527         *ssn = tid_data->agg.ssn;
 528
 529         ret = iwl_trans_tx_agg_alloc(trans(priv), sta_id, tid);
 530         if (ret) {
 531                 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
 532                 return ret;
 533         }
 534
 535         if (*ssn == tid_data->next_reclaimed) {
 536                 IWL_DEBUG_TX_QUEUES(priv, "Can proceed: ssn = next_recl = %d",
 537                                     tid_data->agg.ssn);
 538                 tid_data->agg.state = IWL_AGG_ON;
 539                 iwl_start_tx_ba_trans_ready(priv, vif_priv->ctx->ctxid, sta_id,
 540                                             tid);
 541         } else {
 542                 IWL_DEBUG_TX_QUEUES(priv, "Can't proceed: ssn %d, "
 543                                     "next_reclaimed = %d",
 544                                     tid_data->agg.ssn,
 545                                     tid_data->next_reclaimed);
 546                 tid_data->agg.state = IWL_EMPTYING_HW_QUEUE_ADDBA;
 547         }
 548
 549         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
 550
 551         return ret;
 552 }
 553
 554 int iwlagn_tx_agg_oper(struct iwl_priv *priv, struct ieee80211_vif *vif,
 555                         struct ieee80211_sta *sta, u16 tid, u8 buf_size)
 556 {
 557         struct iwl_station_priv *sta_priv = (void *) sta->drv_priv;
 558         struct iwl_rxon_context *ctx = iwl_rxon_ctx_from_vif(vif);
 559         unsigned long flags;
 560         u16 ssn;
 561
 562         buf_size = min_t(int, buf_size, LINK_QUAL_AGG_FRAME_LIMIT_DEF);
 563
 564         spin_lock_irqsave(&priv->shrd->sta_lock, flags);
 565         ssn = priv->shrd->tid_data[sta_priv->sta_id][tid].agg.ssn;
 566         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
 567
 568         iwl_trans_tx_agg_setup(trans(priv), ctx->ctxid, sta_priv->sta_id, tid,
 569                                buf_size, ssn);
 570
 571         /*
 572          * If the limit is 0, then it wasn't initialised yet,
 573          * use the default. We can do that since we take the
 574          * minimum below, and we don't want to go above our
 575          * default due to hardware restrictions.
 576          */
 577         if (sta_priv->max_agg_bufsize == 0)
 578                 sta_priv->max_agg_bufsize =
 579                         LINK_QUAL_AGG_FRAME_LIMIT_DEF;
 580
 581         /*
 582          * Even though in theory the peer could have different
 583          * aggregation reorder buffer sizes for different sessions,
 584          * our ucode doesn't allow for that and has a global limit
 585          * for each station. Therefore, use the minimum of all the
 586          * aggregation sessions and our default value.
 587          */
 588         sta_priv->max_agg_bufsize =
 589                 min(sta_priv->max_agg_bufsize, buf_size);
 590
 591         if (cfg(priv)->ht_params &&
 592             cfg(priv)->ht_params->use_rts_for_aggregation) {
 593                 /*
 594                  * switch to RTS/CTS if it is the prefer protection
 595                  * method for HT traffic
 596                  */
 597
 598                 sta_priv->lq_sta.lq.general_params.flags |=
 599                         LINK_QUAL_FLAGS_SET_STA_TLC_RTS_MSK;
 600         }
 601         priv->agg_tids_count++;
 602         IWL_DEBUG_HT(priv, "priv->agg_tids_count = %u\n",
 603                      priv->agg_tids_count);
 604
 605         sta_priv->lq_sta.lq.agg_params.agg_frame_cnt_limit =
 606                 sta_priv->max_agg_bufsize;
 607
 608         IWL_INFO(priv, "Tx aggregation enabled on ra = %pM tid = %d\n",
 609                  sta->addr, tid);
 610
 611         return iwl_send_lq_cmd(priv, ctx,
 612                         &sta_priv->lq_sta.lq, CMD_ASYNC, false);
 613 }
 614
 615 static void iwlagn_check_ratid_empty(struct iwl_priv *priv, int sta_id, u8 tid)
 616 {
 617         struct iwl_tid_data *tid_data = &priv->shrd->tid_data[sta_id][tid];
 618
 619         lockdep_assert_held(&priv->shrd->sta_lock);
 620
 621         switch (priv->shrd->tid_data[sta_id][tid].agg.state) {
 622         case IWL_EMPTYING_HW_QUEUE_DELBA:
 623                 /* There are no packets for this RA / TID in the HW any more */
 624                 if (tid_data->agg.ssn == tid_data->next_reclaimed) {
 625                         IWL_DEBUG_TX_QUEUES(priv,
 626                                 "Can continue DELBA flow ssn = next_recl ="
 627                                 " %d", tid_data->next_reclaimed);
 628                         iwl_trans_tx_agg_disable(trans(priv), sta_id, tid);
 629                         tid_data->agg.state = IWL_AGG_OFF;
 630                         iwl_stop_tx_ba_trans_ready(priv,
 631                                                    NUM_IWL_RXON_CTX,
 632                                                    sta_id, tid);
 633                 }
 634                 break;
 635         case IWL_EMPTYING_HW_QUEUE_ADDBA:
 636                 /* There are no packets for this RA / TID in the HW any more */
 637                 if (tid_data->agg.ssn == tid_data->next_reclaimed) {
 638                         IWL_DEBUG_TX_QUEUES(priv,
 639                                 "Can continue ADDBA flow ssn = next_recl ="
 640                                 " %d", tid_data->next_reclaimed);
 641                         tid_data->agg.state = IWL_AGG_ON;
 642                         iwl_start_tx_ba_trans_ready(priv,
 643                                                     NUM_IWL_RXON_CTX,
 644                                                     sta_id, tid);
 645                 }
 646                 break;
 647         default:
 648                 break;
 649         }
 650 }
 651
 652 static void iwlagn_non_agg_tx_status(struct iwl_priv *priv,
 653                                      struct iwl_rxon_context *ctx,
 654                                      const u8 *addr1)
 655 {
 656         struct ieee80211_sta *sta;
 657         struct iwl_station_priv *sta_priv;
 658
 659         rcu_read_lock();
 660         sta = ieee80211_find_sta(ctx->vif, addr1);
 661         if (sta) {
 662                 sta_priv = (void *)sta->drv_priv;
 663                 /* avoid atomic ops if this isn't a client */
 664                 if (sta_priv->client &&
 665                     atomic_dec_return(&sta_priv->pending_frames) == 0)
 666                         ieee80211_sta_block_awake(priv->hw, sta, false);
 667         }
 668         rcu_read_unlock();
 669 }
 670
 671 /**
 672  * translate ucode response to mac80211 tx status control values
 673  */
 674 static void iwlagn_hwrate_to_tx_control(struct iwl_priv *priv, u32 rate_n_flags,
 675                                   struct ieee80211_tx_info *info)
 676 {
 677         struct ieee80211_tx_rate *r = &info->control.rates[0];
 678
 679         info->antenna_sel_tx =
 680                 ((rate_n_flags & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS);
 681         if (rate_n_flags & RATE_MCS_HT_MSK)
 682                 r->flags |= IEEE80211_TX_RC_MCS;
 683         if (rate_n_flags & RATE_MCS_GF_MSK)
 684                 r->flags |= IEEE80211_TX_RC_GREEN_FIELD;
 685         if (rate_n_flags & RATE_MCS_HT40_MSK)
 686                 r->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
 687         if (rate_n_flags & RATE_MCS_DUP_MSK)
 688                 r->flags |= IEEE80211_TX_RC_DUP_DATA;
 689         if (rate_n_flags & RATE_MCS_SGI_MSK)
 690                 r->flags |= IEEE80211_TX_RC_SHORT_GI;
 691         r->idx = iwlagn_hwrate_to_mac80211_idx(rate_n_flags, info->band);
 692 }
 693
 694 #ifdef CONFIG_IWLWIFI_DEBUG
 695 const char *iwl_get_tx_fail_reason(u32 status)
 696 {
 697 #define TX_STATUS_FAIL(x) case TX_STATUS_FAIL_ ## x: return #x
 698 #define TX_STATUS_POSTPONE(x) case TX_STATUS_POSTPONE_ ## x: return #x
 699
 700         switch (status & TX_STATUS_MSK) {
 701         case TX_STATUS_SUCCESS:
 702                 return "SUCCESS";
 703         TX_STATUS_POSTPONE(DELAY);
 704         TX_STATUS_POSTPONE(FEW_BYTES);
 705         TX_STATUS_POSTPONE(BT_PRIO);
 706         TX_STATUS_POSTPONE(QUIET_PERIOD);
 707         TX_STATUS_POSTPONE(CALC_TTAK);
 708         TX_STATUS_FAIL(INTERNAL_CROSSED_RETRY);
 709         TX_STATUS_FAIL(SHORT_LIMIT);
 710         TX_STATUS_FAIL(LONG_LIMIT);
 711         TX_STATUS_FAIL(FIFO_UNDERRUN);
 712         TX_STATUS_FAIL(DRAIN_FLOW);
 713         TX_STATUS_FAIL(RFKILL_FLUSH);
 714         TX_STATUS_FAIL(LIFE_EXPIRE);
 715         TX_STATUS_FAIL(DEST_PS);
 716         TX_STATUS_FAIL(HOST_ABORTED);
 717         TX_STATUS_FAIL(BT_RETRY);
 718         TX_STATUS_FAIL(STA_INVALID);
 719         TX_STATUS_FAIL(FRAG_DROPPED);
 720         TX_STATUS_FAIL(TID_DISABLE);
 721         TX_STATUS_FAIL(FIFO_FLUSHED);
 722         TX_STATUS_FAIL(INSUFFICIENT_CF_POLL);
 723         TX_STATUS_FAIL(PASSIVE_NO_RX);
 724         TX_STATUS_FAIL(NO_BEACON_ON_RADAR);
 725         }
 726
 727         return "UNKNOWN";
 728
 729 #undef TX_STATUS_FAIL
 730 #undef TX_STATUS_POSTPONE
 731 }
 732 #endif /* CONFIG_IWLWIFI_DEBUG */
 733
 734 static void iwlagn_count_agg_tx_err_status(struct iwl_priv *priv, u16 status)
 735 {
 736         status &= AGG_TX_STATUS_MSK;
 737
 738         switch (status) {
 739         case AGG_TX_STATE_UNDERRUN_MSK:
 740                 priv->reply_agg_tx_stats.underrun++;
 741                 break;
 742         case AGG_TX_STATE_BT_PRIO_MSK:
 743                 priv->reply_agg_tx_stats.bt_prio++;
 744                 break;
 745         case AGG_TX_STATE_FEW_BYTES_MSK:
 746                 priv->reply_agg_tx_stats.few_bytes++;
 747                 break;
 748         case AGG_TX_STATE_ABORT_MSK:
 749                 priv->reply_agg_tx_stats.abort++;
 750                 break;
 751         case AGG_TX_STATE_LAST_SENT_TTL_MSK:
 752                 priv->reply_agg_tx_stats.last_sent_ttl++;
 753                 break;
 754         case AGG_TX_STATE_LAST_SENT_TRY_CNT_MSK:
 755                 priv->reply_agg_tx_stats.last_sent_try++;
 756                 break;
 757         case AGG_TX_STATE_LAST_SENT_BT_KILL_MSK:
 758                 priv->reply_agg_tx_stats.last_sent_bt_kill++;
 759                 break;
 760         case AGG_TX_STATE_SCD_QUERY_MSK:
 761                 priv->reply_agg_tx_stats.scd_query++;
 762                 break;
 763         case AGG_TX_STATE_TEST_BAD_CRC32_MSK:
 764                 priv->reply_agg_tx_stats.bad_crc32++;
 765                 break;
 766         case AGG_TX_STATE_RESPONSE_MSK:
 767                 priv->reply_agg_tx_stats.response++;
 768                 break;
 769         case AGG_TX_STATE_DUMP_TX_MSK:
 770                 priv->reply_agg_tx_stats.dump_tx++;
 771                 break;
 772         case AGG_TX_STATE_DELAY_TX_MSK:
 773                 priv->reply_agg_tx_stats.delay_tx++;
 774                 break;
 775         default:
 776                 priv->reply_agg_tx_stats.unknown++;
 777                 break;
 778         }
 779 }
 780
 781 static void iwl_rx_reply_tx_agg(struct iwl_priv *priv,
 782                                 struct iwlagn_tx_resp *tx_resp)
 783 {
 784         struct agg_tx_status *frame_status = &tx_resp->status;
 785         int tid = (tx_resp->ra_tid & IWLAGN_TX_RES_TID_MSK) >>
 786                 IWLAGN_TX_RES_TID_POS;
 787         int sta_id = (tx_resp->ra_tid & IWLAGN_TX_RES_RA_MSK) >>
 788                 IWLAGN_TX_RES_RA_POS;
 789         struct iwl_ht_agg *agg = &priv->shrd->tid_data[sta_id][tid].agg;
 790         u32 status = le16_to_cpu(tx_resp->status.status);
 791         int i;
 792
 793         if (agg->wait_for_ba)
 794                 IWL_DEBUG_TX_REPLY(priv,
 795                         "got tx response w/o block-ack\n");
 796
 797         agg->rate_n_flags = le32_to_cpu(tx_resp->rate_n_flags);
 798         agg->wait_for_ba = (tx_resp->frame_count > 1);
 799
 800         /*
 801          * If the BT kill count is non-zero, we'll get this
 802          * notification again.
 803          */
 804         if (tx_resp->bt_kill_count && tx_resp->frame_count == 1 &&
 805             cfg(priv)->bt_params &&
 806             cfg(priv)->bt_params->advanced_bt_coexist) {
 807                 IWL_DEBUG_COEX(priv, "receive reply tx w/ bt_kill\n");
 808         }
 809
 810         if (tx_resp->frame_count == 1)
 811                 return;
 812
 813         /* Construct bit-map of pending frames within Tx window */
 814         for (i = 0; i < tx_resp->frame_count; i++) {
 815                 u16 fstatus = le16_to_cpu(frame_status[i].status);
 816
 817                 if (status & AGG_TX_STATUS_MSK)
 818                         iwlagn_count_agg_tx_err_status(priv, fstatus);
 819
 820                 if (status & (AGG_TX_STATE_FEW_BYTES_MSK |
 821                               AGG_TX_STATE_ABORT_MSK))
 822                         continue;
 823
 824                 IWL_DEBUG_TX_REPLY(priv, "status %s (0x%08x), "
 825                                    "try-count (0x%08x)\n",
 826                                    iwl_get_agg_tx_fail_reason(fstatus),
 827                                    fstatus & AGG_TX_STATUS_MSK,
 828                                    fstatus & AGG_TX_TRY_MSK);
 829         }
 830 }
 831
 832 #ifdef CONFIG_IWLWIFI_DEBUG
 833 #define AGG_TX_STATE_FAIL(x) case AGG_TX_STATE_ ## x: return #x
 834
 835 const char *iwl_get_agg_tx_fail_reason(u16 status)
 836 {
 837         status &= AGG_TX_STATUS_MSK;
 838         switch (status) {
 839         case AGG_TX_STATE_TRANSMITTED:
 840                 return "SUCCESS";
 841                 AGG_TX_STATE_FAIL(UNDERRUN_MSK);
 842                 AGG_TX_STATE_FAIL(BT_PRIO_MSK);
 843                 AGG_TX_STATE_FAIL(FEW_BYTES_MSK);
 844                 AGG_TX_STATE_FAIL(ABORT_MSK);
 845                 AGG_TX_STATE_FAIL(LAST_SENT_TTL_MSK);
 846                 AGG_TX_STATE_FAIL(LAST_SENT_TRY_CNT_MSK);
 847                 AGG_TX_STATE_FAIL(LAST_SENT_BT_KILL_MSK);
 848                 AGG_TX_STATE_FAIL(SCD_QUERY_MSK);
 849                 AGG_TX_STATE_FAIL(TEST_BAD_CRC32_MSK);
 850                 AGG_TX_STATE_FAIL(RESPONSE_MSK);
 851                 AGG_TX_STATE_FAIL(DUMP_TX_MSK);
 852                 AGG_TX_STATE_FAIL(DELAY_TX_MSK);
 853         }
 854
 855         return "UNKNOWN";
 856 }
 857 #endif /* CONFIG_IWLWIFI_DEBUG */
 858
 859 static inline u32 iwlagn_get_scd_ssn(struct iwlagn_tx_resp *tx_resp)
 860 {
 861         return le32_to_cpup((__le32 *)&tx_resp->status +
 862                             tx_resp->frame_count) & MAX_SN;
 863 }
 864
 865 static void iwlagn_count_tx_err_status(struct iwl_priv *priv, u16 status)
 866 {
 867         status &= TX_STATUS_MSK;
 868
 869         switch (status) {
 870         case TX_STATUS_POSTPONE_DELAY:
 871                 priv->reply_tx_stats.pp_delay++;
 872                 break;
 873         case TX_STATUS_POSTPONE_FEW_BYTES:
 874                 priv->reply_tx_stats.pp_few_bytes++;
 875                 break;
 876         case TX_STATUS_POSTPONE_BT_PRIO:
 877                 priv->reply_tx_stats.pp_bt_prio++;
 878                 break;
 879         case TX_STATUS_POSTPONE_QUIET_PERIOD:
 880                 priv->reply_tx_stats.pp_quiet_period++;
 881                 break;
 882         case TX_STATUS_POSTPONE_CALC_TTAK:
 883                 priv->reply_tx_stats.pp_calc_ttak++;
 884                 break;
 885         case TX_STATUS_FAIL_INTERNAL_CROSSED_RETRY:
 886                 priv->reply_tx_stats.int_crossed_retry++;
 887                 break;
 888         case TX_STATUS_FAIL_SHORT_LIMIT:
 889                 priv->reply_tx_stats.short_limit++;
 890                 break;
 891         case TX_STATUS_FAIL_LONG_LIMIT:
 892                 priv->reply_tx_stats.long_limit++;
 893                 break;
 894         case TX_STATUS_FAIL_FIFO_UNDERRUN:
 895                 priv->reply_tx_stats.fifo_underrun++;
 896                 break;
 897         case TX_STATUS_FAIL_DRAIN_FLOW:
 898                 priv->reply_tx_stats.drain_flow++;
 899                 break;
 900         case TX_STATUS_FAIL_RFKILL_FLUSH:
 901                 priv->reply_tx_stats.rfkill_flush++;
 902                 break;
 903         case TX_STATUS_FAIL_LIFE_EXPIRE:
 904                 priv->reply_tx_stats.life_expire++;
 905                 break;
 906         case TX_STATUS_FAIL_DEST_PS:
 907                 priv->reply_tx_stats.dest_ps++;
 908                 break;
 909         case TX_STATUS_FAIL_HOST_ABORTED:
 910                 priv->reply_tx_stats.host_abort++;
 911                 break;
 912         case TX_STATUS_FAIL_BT_RETRY:
 913                 priv->reply_tx_stats.bt_retry++;
 914                 break;
 915         case TX_STATUS_FAIL_STA_INVALID:
 916                 priv->reply_tx_stats.sta_invalid++;
 917                 break;
 918         case TX_STATUS_FAIL_FRAG_DROPPED:
 919                 priv->reply_tx_stats.frag_drop++;
 920                 break;
 921         case TX_STATUS_FAIL_TID_DISABLE:
 922                 priv->reply_tx_stats.tid_disable++;
 923                 break;
 924         case TX_STATUS_FAIL_FIFO_FLUSHED:
 925                 priv->reply_tx_stats.fifo_flush++;
 926                 break;
 927         case TX_STATUS_FAIL_INSUFFICIENT_CF_POLL:
 928                 priv->reply_tx_stats.insuff_cf_poll++;
 929                 break;
 930         case TX_STATUS_FAIL_PASSIVE_NO_RX:
 931                 priv->reply_tx_stats.fail_hw_drop++;
 932                 break;
 933         case TX_STATUS_FAIL_NO_BEACON_ON_RADAR:
 934                 priv->reply_tx_stats.sta_color_mismatch++;
 935                 break;
 936         default:
 937                 priv->reply_tx_stats.unknown++;
 938                 break;
 939         }
 940 }
 941
 942 static void iwlagn_set_tx_status(struct iwl_priv *priv,
 943                                  struct ieee80211_tx_info *info,
 944                                  struct iwlagn_tx_resp *tx_resp,
 945                                  bool is_agg)
 946 {
 947         u16  status = le16_to_cpu(tx_resp->status.status);
 948
 949         info->status.rates[0].count = tx_resp->failure_frame + 1;
 950         if (is_agg)
 951                 info->flags &= ~IEEE80211_TX_CTL_AMPDU;
 952         info->flags |= iwl_tx_status_to_mac80211(status);
 953         iwlagn_hwrate_to_tx_control(priv, le32_to_cpu(tx_resp->rate_n_flags),
 954                                     info);
 955         if (!iwl_is_tx_success(status))
 956                 iwlagn_count_tx_err_status(priv, status);
 957 }
 958
 959 static void iwl_check_abort_status(struct iwl_priv *priv,
 960                             u8 frame_count, u32 status)
 961 {
 962         if (frame_count == 1 && status == TX_STATUS_FAIL_RFKILL_FLUSH) {
 963                 IWL_ERR(priv, "Tx flush command to flush out all frames\n");
 964                 if (!test_bit(STATUS_EXIT_PENDING, &priv->shrd->status))
 965                         queue_work(priv->shrd->workqueue, &priv->tx_flush);
 966         }
 967 }
 968
 969 int iwlagn_rx_reply_tx(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb,
 970                                struct iwl_device_cmd *cmd)
 971 {
 972         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 973         u16 sequence = le16_to_cpu(pkt->hdr.sequence);
 974         int txq_id = SEQ_TO_QUEUE(sequence);
 975         int cmd_index __maybe_unused = SEQ_TO_INDEX(sequence);
 976         struct iwlagn_tx_resp *tx_resp = (void *)&pkt->u.raw[0];
 977         struct ieee80211_hdr *hdr;
 978         u32 status = le16_to_cpu(tx_resp->status.status);
 979         u16 ssn = iwlagn_get_scd_ssn(tx_resp);
 980         int tid;
 981         int sta_id;
 982         int freed;
 983         struct ieee80211_tx_info *info;
 984         unsigned long flags;
 985         struct sk_buff_head skbs;
 986         struct sk_buff *skb;
 987         struct iwl_rxon_context *ctx;
 988         bool is_agg = (txq_id >= IWLAGN_FIRST_AMPDU_QUEUE);
 989
 990         tid = (tx_resp->ra_tid & IWLAGN_TX_RES_TID_MSK) >>
 991                 IWLAGN_TX_RES_TID_POS;
 992         sta_id = (tx_resp->ra_tid & IWLAGN_TX_RES_RA_MSK) >>
 993                 IWLAGN_TX_RES_RA_POS;
 994
 995         spin_lock_irqsave(&priv->shrd->sta_lock, flags);
 996
 997         if (is_agg)
 998                 iwl_rx_reply_tx_agg(priv, tx_resp);
 999
1000         if (tx_resp->frame_count == 1) {
1001                 u16 next_reclaimed = le16_to_cpu(tx_resp->seq_ctl);
1002                 next_reclaimed = SEQ_TO_SN(next_reclaimed + 0x10);
1003
1004                 if (is_agg) {
1005                         /* If this is an aggregation queue, we can rely on the
1006                          * ssn since the wifi sequence number corresponds to
1007                          * the index in the TFD ring (%256).
1008                          * The seq_ctl is the sequence control of the packet
1009                          * to which this Tx response relates. But if there is a
1010                          * hole in the bitmap of the BA we received, this Tx
1011                          * response may allow to reclaim the hole and all the
1012                          * subsequent packets that were already acked.
1013                          * In that case, seq_ctl != ssn, and the next packet
1014                          * to be reclaimed will be ssn and not seq_ctl.
1015                          */
1016                         next_reclaimed = ssn;
1017                 }
1018
1019                 __skb_queue_head_init(&skbs);
1020                 priv->shrd->tid_data[sta_id][tid].next_reclaimed =
1021                         next_reclaimed;
1022
1023                 IWL_DEBUG_TX_REPLY(priv, "Next reclaimed packet:%d",
1024                                           next_reclaimed);
1025
1026                 /*we can free until ssn % q.n_bd not inclusive */
1027                 WARN_ON(iwl_trans_reclaim(trans(priv), sta_id, tid, txq_id,
1028                                   ssn, status, &skbs));
1029                 iwlagn_check_ratid_empty(priv, sta_id, tid);
1030                 freed = 0;
1031                 while (!skb_queue_empty(&skbs)) {
1032                         skb = __skb_dequeue(&skbs);
1033                         hdr = (struct ieee80211_hdr *)skb->data;
1034
1035                         if (!ieee80211_is_data_qos(hdr->frame_control))
1036                                 priv->last_seq_ctl = tx_resp->seq_ctl;
1037
1038                         info = IEEE80211_SKB_CB(skb);
1039                         ctx = info->driver_data[0];
1040                         kmem_cache_free(priv->tx_cmd_pool,
1041                                         (info->driver_data[1]));
1042
1043                         memset(&info->status, 0, sizeof(info->status));
1044
1045                         if (status == TX_STATUS_FAIL_PASSIVE_NO_RX &&
1046                             iwl_is_associated_ctx(ctx) && ctx->vif &&
1047                             ctx->vif->type == NL80211_IFTYPE_STATION) {
1048                                 ctx->last_tx_rejected = true;
1049                                 iwl_trans_stop_queue(trans(priv), txq_id,
1050                                         "Tx on passive channel");
1051
1052                                 IWL_DEBUG_TX_REPLY(priv,
1053                                            "TXQ %d status %s (0x%08x) "
1054                                            "rate_n_flags 0x%x retries %d\n",
1055                                            txq_id,
1056                                            iwl_get_tx_fail_reason(status),
1057                                            status,
1058                                            le32_to_cpu(tx_resp->rate_n_flags),
1059                                            tx_resp->failure_frame);
1060
1061                                 IWL_DEBUG_TX_REPLY(priv,
1062                                            "FrameCnt = %d, idx=%d\n",
1063                                            tx_resp->frame_count, cmd_index);
1064                         }
1065
1066                         /* check if BAR is needed */
1067                         if (is_agg && !iwl_is_tx_success(status))
1068                                 info->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK;
1069                         iwlagn_set_tx_status(priv, IEEE80211_SKB_CB(skb),
1070                                      tx_resp, is_agg);
1071                         if (!is_agg)
1072                                 iwlagn_non_agg_tx_status(priv, ctx, hdr->addr1);
1073
1074                         ieee80211_tx_status_irqsafe(priv->hw, skb);
1075
1076                         freed++;
1077                 }
1078
1079                 WARN_ON(!is_agg && freed != 1);
1080         }
1081
1082         iwl_check_abort_status(priv, tx_resp->frame_count, status);
1083         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
1084         return 0;
1085 }
1086
1087 /**
1088  * iwlagn_rx_reply_compressed_ba - Handler for REPLY_COMPRESSED_BA
1089  *
1090  * Handles block-acknowledge notification from device, which reports success
1091  * of frames sent via aggregation.
1092  */
1093 int iwlagn_rx_reply_compressed_ba(struct iwl_priv *priv,
1094                                    struct iwl_rx_mem_buffer *rxb,
1095                                    struct iwl_device_cmd *cmd)
1096 {
1097         struct iwl_rx_packet *pkt = rxb_addr(rxb);
1098         struct iwl_compressed_ba_resp *ba_resp = &pkt->u.compressed_ba;
1099         struct iwl_ht_agg *agg;
1100         struct sk_buff_head reclaimed_skbs;
1101         struct ieee80211_tx_info *info;
1102         struct ieee80211_hdr *hdr;
1103         struct sk_buff *skb;
1104         unsigned long flags;
1105         int sta_id;
1106         int tid;
1107         int freed;
1108
1109         /* "flow" corresponds to Tx queue */
1110         u16 scd_flow = le16_to_cpu(ba_resp->scd_flow);
1111
1112         /* "ssn" is start of block-ack Tx window, corresponds to index
1113          * (in Tx queue's circular buffer) of first TFD/frame in window */
1114         u16 ba_resp_scd_ssn = le16_to_cpu(ba_resp->scd_ssn);
1115
1116         if (scd_flow >= hw_params(priv).max_txq_num) {
1117                 IWL_ERR(priv,
1118                         "BUG_ON scd_flow is bigger than number of queues\n");
1119                 return 0;
1120         }
1121
1122         sta_id = ba_resp->sta_id;
1123         tid = ba_resp->tid;
1124         agg = &priv->shrd->tid_data[sta_id][tid].agg;
1125
1126         spin_lock_irqsave(&priv->shrd->sta_lock, flags);
1127
1128         if (unlikely(!agg->wait_for_ba)) {
1129                 if (unlikely(ba_resp->bitmap))
1130                         IWL_ERR(priv, "Received BA when not expected\n");
1131                 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
1132                 return 0;
1133         }
1134
1135         __skb_queue_head_init(&reclaimed_skbs);
1136
1137         /* Release all TFDs before the SSN, i.e. all TFDs in front of
1138          * block-ack window (we assume that they've been successfully
1139          * transmitted ... if not, it's too late anyway). */
1140         if (iwl_trans_reclaim(trans(priv), sta_id, tid, scd_flow,
1141                               ba_resp_scd_ssn, 0, &reclaimed_skbs)) {
1142                 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
1143                 return 0;
1144         }
1145
1146         IWL_DEBUG_TX_REPLY(priv, "REPLY_COMPRESSED_BA [%d] Received from %pM, "
1147                            "sta_id = %d\n",
1148                            agg->wait_for_ba,
1149                            (u8 *) &ba_resp->sta_addr_lo32,
1150                            ba_resp->sta_id);
1151         IWL_DEBUG_TX_REPLY(priv, "TID = %d, SeqCtl = %d, bitmap = 0x%llx, "
1152                            "scd_flow = %d, scd_ssn = %d\n",
1153                            ba_resp->tid, le16_to_cpu(ba_resp->seq_ctl),
1154                            (unsigned long long)le64_to_cpu(ba_resp->bitmap),
1155                            scd_flow, ba_resp_scd_ssn);
1156
1157         /* Mark that the expected block-ack response arrived */
1158         agg->wait_for_ba = false;
1159
1160         /* Sanity check values reported by uCode */
1161         if (ba_resp->txed_2_done > ba_resp->txed) {
1162                 IWL_DEBUG_TX_REPLY(priv,
1163                         "bogus sent(%d) and ack(%d) count\n",
1164                         ba_resp->txed, ba_resp->txed_2_done);
1165                 /*
1166                  * set txed_2_done = txed,
1167                  * so it won't impact rate scale
1168                  */
1169                 ba_resp->txed = ba_resp->txed_2_done;
1170         }
1171         IWL_DEBUG_HT(priv, "agg frames sent:%d, acked:%d\n",
1172                         ba_resp->txed, ba_resp->txed_2_done);
1173
1174         priv->shrd->tid_data[sta_id][tid].next_reclaimed = ba_resp_scd_ssn;
1175
1176         iwlagn_check_ratid_empty(priv, sta_id, tid);
1177         freed = 0;
1178         while (!skb_queue_empty(&reclaimed_skbs)) {
1179
1180                 skb = __skb_dequeue(&reclaimed_skbs);
1181                 hdr = (struct ieee80211_hdr *)skb->data;
1182
1183                 if (ieee80211_is_data_qos(hdr->frame_control))
1184                         freed++;
1185                 else
1186                         WARN_ON_ONCE(1);
1187
1188                 info = IEEE80211_SKB_CB(skb);
1189                 kmem_cache_free(priv->tx_cmd_pool, (info->driver_data[1]));
1190
1191                 if (freed == 1) {
1192                         /* this is the first skb we deliver in this batch */
1193                         /* put the rate scaling data there */
1194                         info = IEEE80211_SKB_CB(skb);
1195                         memset(&info->status, 0, sizeof(info->status));
1196                         info->flags |= IEEE80211_TX_STAT_ACK;
1197                         info->flags |= IEEE80211_TX_STAT_AMPDU;
1198                         info->status.ampdu_ack_len = ba_resp->txed_2_done;
1199                         info->status.ampdu_len = ba_resp->txed;
1200                         iwlagn_hwrate_to_tx_control(priv, agg->rate_n_flags,
1201                                                     info);
1202                 }
1203
1204                 ieee80211_tx_status_irqsafe(priv->hw, skb);
1205         }
1206
1207         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
1208         return 0;
1209 }