Pileus Git - ~andy/linux/blob - drivers/net/wireless/iwlwifi/iwl-agn-tx.c

   1 /******************************************************************************
   2  *
   3  * GPL LICENSE SUMMARY
   4  *
   5  * Copyright(c) 2008 - 2012 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                 tx_cmd->tid_tspec = IWL_TID_NON_QOS;
  95                 if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ)
  96                         tx_flags |= TX_CMD_FLG_SEQ_CTL_MSK;
  97                 else
  98                         tx_flags &= ~TX_CMD_FLG_SEQ_CTL_MSK;
  99         }
 100
 101         iwlagn_tx_cmd_protection(priv, info, fc, &tx_flags);
 102
 103         tx_flags &= ~(TX_CMD_FLG_ANT_SEL_MSK);
 104         if (ieee80211_is_mgmt(fc)) {
 105                 if (ieee80211_is_assoc_req(fc) || ieee80211_is_reassoc_req(fc))
 106                         tx_cmd->timeout.pm_frame_timeout = cpu_to_le16(3);
 107                 else
 108                         tx_cmd->timeout.pm_frame_timeout = cpu_to_le16(2);
 109         } else {
 110                 tx_cmd->timeout.pm_frame_timeout = 0;
 111         }
 112
 113         tx_cmd->driver_txop = 0;
 114         tx_cmd->tx_flags = tx_flags;
 115         tx_cmd->next_frame_len = 0;
 116 }
 117
 118 static void iwlagn_tx_cmd_build_rate(struct iwl_priv *priv,
 119                                      struct iwl_tx_cmd *tx_cmd,
 120                                      struct ieee80211_tx_info *info,
 121                                      __le16 fc)
 122 {
 123         u32 rate_flags;
 124         int rate_idx;
 125         u8 rts_retry_limit;
 126         u8 data_retry_limit;
 127         u8 rate_plcp;
 128
 129         if (priv->shrd->wowlan) {
 130                 rts_retry_limit = IWLAGN_LOW_RETRY_LIMIT;
 131                 data_retry_limit = IWLAGN_LOW_RETRY_LIMIT;
 132         } else {
 133                 /* Set retry limit on RTS packets */
 134                 rts_retry_limit = IWLAGN_RTS_DFAULT_RETRY_LIMIT;
 135
 136                 /* Set retry limit on DATA packets and Probe Responses*/
 137                 if (ieee80211_is_probe_resp(fc)) {
 138                         data_retry_limit = IWLAGN_MGMT_DFAULT_RETRY_LIMIT;
 139                         rts_retry_limit =
 140                                 min(data_retry_limit, rts_retry_limit);
 141                 } else if (ieee80211_is_back_req(fc))
 142                         data_retry_limit = IWLAGN_BAR_DFAULT_RETRY_LIMIT;
 143                 else
 144                         data_retry_limit = IWLAGN_DEFAULT_TX_RETRY;
 145         }
 146
 147         tx_cmd->data_retry_limit = data_retry_limit;
 148         tx_cmd->rts_retry_limit = rts_retry_limit;
 149
 150         /* DATA packets will use the uCode station table for rate/antenna
 151          * selection */
 152         if (ieee80211_is_data(fc)) {
 153                 tx_cmd->initial_rate_index = 0;
 154                 tx_cmd->tx_flags |= TX_CMD_FLG_STA_RATE_MSK;
 155 #ifdef CONFIG_IWLWIFI_DEVICE_TESTMODE
 156                 if (priv->tm_fixed_rate) {
 157                         /*
 158                          * rate overwrite by testmode
 159                          * we not only send lq command to change rate
 160                          * we also re-enforce per data pkt base.
 161                          */
 162                         tx_cmd->tx_flags &= ~TX_CMD_FLG_STA_RATE_MSK;
 163                         memcpy(&tx_cmd->rate_n_flags, &priv->tm_fixed_rate,
 164                                sizeof(tx_cmd->rate_n_flags));
 165                 }
 166 #endif
 167                 return;
 168         } else if (ieee80211_is_back_req(fc))
 169                 tx_cmd->tx_flags |= TX_CMD_FLG_STA_RATE_MSK;
 170
 171         /**
 172          * If the current TX rate stored in mac80211 has the MCS bit set, it's
 173          * not really a TX rate.  Thus, we use the lowest supported rate for
 174          * this band.  Also use the lowest supported rate if the stored rate
 175          * index is invalid.
 176          */
 177         rate_idx = info->control.rates[0].idx;
 178         if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS ||
 179                         (rate_idx < 0) || (rate_idx > IWL_RATE_COUNT_LEGACY))
 180                 rate_idx = rate_lowest_index(&priv->bands[info->band],
 181                                 info->control.sta);
 182         /* For 5 GHZ band, remap mac80211 rate indices into driver indices */
 183         if (info->band == IEEE80211_BAND_5GHZ)
 184                 rate_idx += IWL_FIRST_OFDM_RATE;
 185         /* Get PLCP rate for tx_cmd->rate_n_flags */
 186         rate_plcp = iwl_rates[rate_idx].plcp;
 187         /* Zero out flags for this packet */
 188         rate_flags = 0;
 189
 190         /* Set CCK flag as needed */
 191         if ((rate_idx >= IWL_FIRST_CCK_RATE) && (rate_idx <= IWL_LAST_CCK_RATE))
 192                 rate_flags |= RATE_MCS_CCK_MSK;
 193
 194         /* Set up antennas */
 195          if (cfg(priv)->bt_params &&
 196              cfg(priv)->bt_params->advanced_bt_coexist &&
 197              priv->bt_full_concurrent) {
 198                 /* operated as 1x1 in full concurrency mode */
 199                 priv->mgmt_tx_ant = iwl_toggle_tx_ant(priv, priv->mgmt_tx_ant,
 200                                 first_antenna(hw_params(priv).valid_tx_ant));
 201         } else
 202                 priv->mgmt_tx_ant = iwl_toggle_tx_ant(priv, priv->mgmt_tx_ant,
 203                                                 hw_params(priv).valid_tx_ant);
 204         rate_flags |= iwl_ant_idx_to_flags(priv->mgmt_tx_ant);
 205
 206         /* Set the rate in the TX cmd */
 207         tx_cmd->rate_n_flags = iwl_hw_set_rate_n_flags(rate_plcp, rate_flags);
 208 }
 209
 210 static void iwlagn_tx_cmd_build_hwcrypto(struct iwl_priv *priv,
 211                                       struct ieee80211_tx_info *info,
 212                                       struct iwl_tx_cmd *tx_cmd,
 213                                       struct sk_buff *skb_frag,
 214                                       int sta_id)
 215 {
 216         struct ieee80211_key_conf *keyconf = info->control.hw_key;
 217
 218         switch (keyconf->cipher) {
 219         case WLAN_CIPHER_SUITE_CCMP:
 220                 tx_cmd->sec_ctl = TX_CMD_SEC_CCM;
 221                 memcpy(tx_cmd->key, keyconf->key, keyconf->keylen);
 222                 if (info->flags & IEEE80211_TX_CTL_AMPDU)
 223                         tx_cmd->tx_flags |= TX_CMD_FLG_AGG_CCMP_MSK;
 224                 IWL_DEBUG_TX(priv, "tx_cmd with AES hwcrypto\n");
 225                 break;
 226
 227         case WLAN_CIPHER_SUITE_TKIP:
 228                 tx_cmd->sec_ctl = TX_CMD_SEC_TKIP;
 229                 ieee80211_get_tkip_p2k(keyconf, skb_frag, tx_cmd->key);
 230                 IWL_DEBUG_TX(priv, "tx_cmd with tkip hwcrypto\n");
 231                 break;
 232
 233         case WLAN_CIPHER_SUITE_WEP104:
 234                 tx_cmd->sec_ctl |= TX_CMD_SEC_KEY128;
 235                 /* fall through */
 236         case WLAN_CIPHER_SUITE_WEP40:
 237                 tx_cmd->sec_ctl |= (TX_CMD_SEC_WEP |
 238                         (keyconf->keyidx & TX_CMD_SEC_MSK) << TX_CMD_SEC_SHIFT);
 239
 240                 memcpy(&tx_cmd->key[3], keyconf->key, keyconf->keylen);
 241
 242                 IWL_DEBUG_TX(priv, "Configuring packet for WEP encryption "
 243                              "with key %d\n", keyconf->keyidx);
 244                 break;
 245
 246         default:
 247                 IWL_ERR(priv, "Unknown encode cipher %x\n", keyconf->cipher);
 248                 break;
 249         }
 250 }
 251
 252 /*
 253  * start REPLY_TX command process
 254  */
 255 int iwlagn_tx_skb(struct iwl_priv *priv, struct sk_buff *skb)
 256 {
 257         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 258         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 259         struct iwl_station_priv *sta_priv = NULL;
 260         struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
 261         struct iwl_device_cmd *dev_cmd = NULL;
 262         struct iwl_tx_cmd *tx_cmd;
 263
 264         __le16 fc;
 265         u8 hdr_len;
 266         u16 len, seq_number = 0;
 267         u8 sta_id, tid = IWL_MAX_TID_COUNT;
 268         unsigned long flags;
 269         bool is_agg = false;
 270
 271         if (info->control.vif)
 272                 ctx = iwl_rxon_ctx_from_vif(info->control.vif);
 273
 274         spin_lock_irqsave(&priv->shrd->lock, flags);
 275         if (iwl_is_rfkill(priv->shrd)) {
 276                 IWL_DEBUG_DROP(priv, "Dropping - RF KILL\n");
 277                 goto drop_unlock_priv;
 278         }
 279
 280         fc = hdr->frame_control;
 281
 282 #ifdef CONFIG_IWLWIFI_DEBUG
 283         if (ieee80211_is_auth(fc))
 284                 IWL_DEBUG_TX(priv, "Sending AUTH frame\n");
 285         else if (ieee80211_is_assoc_req(fc))
 286                 IWL_DEBUG_TX(priv, "Sending ASSOC frame\n");
 287         else if (ieee80211_is_reassoc_req(fc))
 288                 IWL_DEBUG_TX(priv, "Sending REASSOC frame\n");
 289 #endif
 290
 291         if (unlikely(ieee80211_is_probe_resp(fc))) {
 292                 struct iwl_wipan_noa_data *noa_data =
 293                         rcu_dereference(priv->noa_data);
 294
 295                 if (noa_data &&
 296                     pskb_expand_head(skb, 0, noa_data->length,
 297                                      GFP_ATOMIC) == 0) {
 298                         memcpy(skb_put(skb, noa_data->length),
 299                                noa_data->data, noa_data->length);
 300                         hdr = (struct ieee80211_hdr *)skb->data;
 301                 }
 302         }
 303
 304         hdr_len = ieee80211_hdrlen(fc);
 305
 306         /* For management frames use broadcast id to do not break aggregation */
 307         if (!ieee80211_is_data(fc))
 308                 sta_id = ctx->bcast_sta_id;
 309         else {
 310                 /* Find index into station table for destination station */
 311                 sta_id = iwl_sta_id_or_broadcast(priv, ctx, info->control.sta);
 312                 if (sta_id == IWL_INVALID_STATION) {
 313                         IWL_DEBUG_DROP(priv, "Dropping - INVALID STATION: %pM\n",
 314                                        hdr->addr1);
 315                         goto drop_unlock_priv;
 316                 }
 317         }
 318
 319         IWL_DEBUG_TX(priv, "station Id %d\n", sta_id);
 320
 321         if (info->control.sta)
 322                 sta_priv = (void *)info->control.sta->drv_priv;
 323
 324         if (sta_priv && sta_priv->asleep &&
 325             (info->flags & IEEE80211_TX_CTL_POLL_RESPONSE)) {
 326                 /*
 327                  * This sends an asynchronous command to the device,
 328                  * but we can rely on it being processed before the
 329                  * next frame is processed -- and the next frame to
 330                  * this station is the one that will consume this
 331                  * counter.
 332                  * For now set the counter to just 1 since we do not
 333                  * support uAPSD yet.
 334                  */
 335                 iwl_sta_modify_sleep_tx_count(priv, sta_id, 1);
 336         }
 337
 338         if (info->flags & IEEE80211_TX_CTL_AMPDU)
 339                 is_agg = true;
 340
 341         /* irqs already disabled/saved above when locking priv->shrd->lock */
 342         spin_lock(&priv->shrd->sta_lock);
 343
 344         dev_cmd = kmem_cache_alloc(priv->tx_cmd_pool, GFP_ATOMIC);
 345
 346         if (unlikely(!dev_cmd))
 347                 goto drop_unlock_sta;
 348
 349         memset(dev_cmd, 0, sizeof(*dev_cmd));
 350         tx_cmd = (struct iwl_tx_cmd *) dev_cmd->payload;
 351
 352         /* Total # bytes to be transmitted */
 353         len = (u16)skb->len;
 354         tx_cmd->len = cpu_to_le16(len);
 355
 356         if (info->control.hw_key)
 357                 iwlagn_tx_cmd_build_hwcrypto(priv, info, tx_cmd, skb, sta_id);
 358
 359         /* TODO need this for burst mode later on */
 360         iwlagn_tx_cmd_build_basic(priv, skb, tx_cmd, info, hdr, sta_id);
 361         iwl_dbg_log_tx_data_frame(priv, len, hdr);
 362
 363         iwlagn_tx_cmd_build_rate(priv, tx_cmd, info, fc);
 364
 365         iwl_update_stats(priv, true, fc, len);
 366
 367         memset(&info->status, 0, sizeof(info->status));
 368
 369         info->driver_data[0] = ctx;
 370         info->driver_data[1] = dev_cmd;
 371
 372         if (ieee80211_is_data_qos(fc) && !ieee80211_is_qos_nullfunc(fc)) {
 373                 u8 *qc = NULL;
 374                 struct iwl_tid_data *tid_data;
 375                 qc = ieee80211_get_qos_ctl(hdr);
 376                 tid = qc[0] & IEEE80211_QOS_CTL_TID_MASK;
 377                 if (WARN_ON_ONCE(tid >= IWL_MAX_TID_COUNT))
 378                         goto drop_unlock_sta;
 379                 tid_data = &priv->tid_data[sta_id][tid];
 380
 381                 /* aggregation is on for this <sta,tid> */
 382                 if (info->flags & IEEE80211_TX_CTL_AMPDU &&
 383                     tid_data->agg.state != IWL_AGG_ON) {
 384                         IWL_ERR(priv, "TX_CTL_AMPDU while not in AGG:"
 385                                 " Tx flags = 0x%08x, agg.state = %d",
 386                                 info->flags, tid_data->agg.state);
 387                         IWL_ERR(priv, "sta_id = %d, tid = %d seq_num = %d",
 388                                 sta_id, tid, SEQ_TO_SN(tid_data->seq_number));
 389                         goto drop_unlock_sta;
 390                 }
 391
 392                 /* We can receive packets from the stack in IWL_AGG_{ON,OFF}
 393                  * only. Check this here.
 394                  */
 395                 if (WARN_ONCE(tid_data->agg.state != IWL_AGG_ON &&
 396                     tid_data->agg.state != IWL_AGG_OFF,
 397                     "Tx while agg.state = %d", tid_data->agg.state))
 398                         goto drop_unlock_sta;
 399
 400                 seq_number = tid_data->seq_number;
 401                 seq_number &= IEEE80211_SCTL_SEQ;
 402                 hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
 403                 hdr->seq_ctrl |= cpu_to_le16(seq_number);
 404                 seq_number += 0x10;
 405         }
 406
 407         /* Copy MAC header from skb into command buffer */
 408         memcpy(tx_cmd->hdr, hdr, hdr_len);
 409
 410         if (iwl_trans_tx(trans(priv), skb, dev_cmd, ctx->ctxid, sta_id, tid))
 411                 goto drop_unlock_sta;
 412
 413         if (ieee80211_is_data_qos(fc) && !ieee80211_is_qos_nullfunc(fc) &&
 414             !ieee80211_has_morefrags(fc))
 415                 priv->tid_data[sta_id][tid].seq_number = seq_number;
 416
 417         spin_unlock(&priv->shrd->sta_lock);
 418         spin_unlock_irqrestore(&priv->shrd->lock, flags);
 419
 420         /*
 421          * Avoid atomic ops if it isn't an associated client.
 422          * Also, if this is a packet for aggregation, don't
 423          * increase the counter because the ucode will stop
 424          * aggregation queues when their respective station
 425          * goes to sleep.
 426          */
 427         if (sta_priv && sta_priv->client && !is_agg)
 428                 atomic_inc(&sta_priv->pending_frames);
 429
 430         return 0;
 431
 432 drop_unlock_sta:
 433         if (dev_cmd)
 434                 kmem_cache_free(priv->tx_cmd_pool, dev_cmd);
 435         spin_unlock(&priv->shrd->sta_lock);
 436 drop_unlock_priv:
 437         spin_unlock_irqrestore(&priv->shrd->lock, flags);
 438         return -1;
 439 }
 440
 441 int iwlagn_tx_agg_stop(struct iwl_priv *priv, struct ieee80211_vif *vif,
 442                         struct ieee80211_sta *sta, u16 tid)
 443 {
 444         struct iwl_tid_data *tid_data;
 445         unsigned long flags;
 446         int sta_id;
 447
 448         sta_id = iwl_sta_id(sta);
 449
 450         if (sta_id == IWL_INVALID_STATION) {
 451                 IWL_ERR(priv, "Invalid station for AGG tid %d\n", tid);
 452                 return -ENXIO;
 453         }
 454
 455         spin_lock_irqsave(&priv->shrd->sta_lock, flags);
 456
 457         tid_data = &priv->tid_data[sta_id][tid];
 458
 459         switch (priv->tid_data[sta_id][tid].agg.state) {
 460         case IWL_EMPTYING_HW_QUEUE_ADDBA:
 461                 /*
 462                 * This can happen if the peer stops aggregation
 463                 * again before we've had a chance to drain the
 464                 * queue we selected previously, i.e. before the
 465                 * session was really started completely.
 466                 */
 467                 IWL_DEBUG_HT(priv, "AGG stop before setup done\n");
 468                 goto turn_off;
 469         case IWL_AGG_ON:
 470                 break;
 471         default:
 472                 IWL_WARN(priv, "Stopping AGG while state not ON "
 473                          "or starting for %d on %d (%d)\n", sta_id, tid,
 474                          priv->tid_data[sta_id][tid].agg.state);
 475                 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
 476                 return 0;
 477         }
 478
 479         tid_data->agg.ssn = SEQ_TO_SN(tid_data->seq_number);
 480
 481         /* There are still packets for this RA / TID in the HW */
 482         if (tid_data->agg.ssn != tid_data->next_reclaimed) {
 483                 IWL_DEBUG_TX_QUEUES(priv, "Can't proceed: ssn %d, "
 484                                     "next_recl = %d",
 485                                     tid_data->agg.ssn,
 486                                     tid_data->next_reclaimed);
 487                 priv->tid_data[sta_id][tid].agg.state =
 488                         IWL_EMPTYING_HW_QUEUE_DELBA;
 489                 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
 490                 return 0;
 491         }
 492
 493         IWL_DEBUG_TX_QUEUES(priv, "Can proceed: ssn = next_recl = %d",
 494                             tid_data->agg.ssn);
 495 turn_off:
 496         priv->tid_data[sta_id][tid].agg.state = IWL_AGG_OFF;
 497
 498         /* do not restore/save irqs */
 499         spin_unlock(&priv->shrd->sta_lock);
 500         spin_lock(&priv->shrd->lock);
 501
 502         iwl_trans_tx_agg_disable(trans(priv), sta_id, tid);
 503
 504         spin_unlock_irqrestore(&priv->shrd->lock, flags);
 505
 506         ieee80211_stop_tx_ba_cb_irqsafe(vif, sta->addr, tid);
 507
 508         return 0;
 509 }
 510
 511 int iwlagn_tx_agg_start(struct iwl_priv *priv, struct ieee80211_vif *vif,
 512                         struct ieee80211_sta *sta, u16 tid, u16 *ssn)
 513 {
 514         struct iwl_tid_data *tid_data;
 515         unsigned long flags;
 516         int sta_id;
 517         int ret;
 518
 519         IWL_DEBUG_HT(priv, "TX AGG request on ra = %pM tid = %d\n",
 520                      sta->addr, tid);
 521
 522         sta_id = iwl_sta_id(sta);
 523         if (sta_id == IWL_INVALID_STATION) {
 524                 IWL_ERR(priv, "Start AGG on invalid station\n");
 525                 return -ENXIO;
 526         }
 527         if (unlikely(tid >= IWL_MAX_TID_COUNT))
 528                 return -EINVAL;
 529
 530         if (priv->tid_data[sta_id][tid].agg.state != IWL_AGG_OFF) {
 531                 IWL_ERR(priv, "Start AGG when state is not IWL_AGG_OFF !\n");
 532                 return -ENXIO;
 533         }
 534
 535         ret = iwl_sta_tx_modify_enable_tid(priv, sta_id, tid);
 536         if (ret)
 537                 return ret;
 538
 539         spin_lock_irqsave(&priv->shrd->sta_lock, flags);
 540
 541         tid_data = &priv->tid_data[sta_id][tid];
 542         tid_data->agg.ssn = SEQ_TO_SN(tid_data->seq_number);
 543
 544         *ssn = tid_data->agg.ssn;
 545
 546         ret = iwl_trans_tx_agg_alloc(trans(priv), sta_id, tid);
 547         if (ret) {
 548                 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
 549                 return ret;
 550         }
 551
 552         if (*ssn == tid_data->next_reclaimed) {
 553                 IWL_DEBUG_TX_QUEUES(priv, "Can proceed: ssn = next_recl = %d",
 554                                     tid_data->agg.ssn);
 555                 tid_data->agg.state = IWL_AGG_ON;
 556                 ieee80211_start_tx_ba_cb_irqsafe(vif, sta->addr, tid);
 557         } else {
 558                 IWL_DEBUG_TX_QUEUES(priv, "Can't proceed: ssn %d, "
 559                                     "next_reclaimed = %d",
 560                                     tid_data->agg.ssn,
 561                                     tid_data->next_reclaimed);
 562                 tid_data->agg.state = IWL_EMPTYING_HW_QUEUE_ADDBA;
 563         }
 564
 565         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
 566
 567         return ret;
 568 }
 569
 570 int iwlagn_tx_agg_oper(struct iwl_priv *priv, struct ieee80211_vif *vif,
 571                         struct ieee80211_sta *sta, u16 tid, u8 buf_size)
 572 {
 573         struct iwl_station_priv *sta_priv = (void *) sta->drv_priv;
 574         struct iwl_rxon_context *ctx = iwl_rxon_ctx_from_vif(vif);
 575         unsigned long flags;
 576         u16 ssn;
 577
 578         buf_size = min_t(int, buf_size, LINK_QUAL_AGG_FRAME_LIMIT_DEF);
 579
 580         spin_lock_irqsave(&priv->shrd->sta_lock, flags);
 581         ssn = priv->tid_data[sta_priv->sta_id][tid].agg.ssn;
 582         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
 583
 584         iwl_trans_tx_agg_setup(trans(priv), ctx->ctxid, sta_priv->sta_id, tid,
 585                                buf_size, ssn);
 586
 587         /*
 588          * If the limit is 0, then it wasn't initialised yet,
 589          * use the default. We can do that since we take the
 590          * minimum below, and we don't want to go above our
 591          * default due to hardware restrictions.
 592          */
 593         if (sta_priv->max_agg_bufsize == 0)
 594                 sta_priv->max_agg_bufsize =
 595                         LINK_QUAL_AGG_FRAME_LIMIT_DEF;
 596
 597         /*
 598          * Even though in theory the peer could have different
 599          * aggregation reorder buffer sizes for different sessions,
 600          * our ucode doesn't allow for that and has a global limit
 601          * for each station. Therefore, use the minimum of all the
 602          * aggregation sessions and our default value.
 603          */
 604         sta_priv->max_agg_bufsize =
 605                 min(sta_priv->max_agg_bufsize, buf_size);
 606
 607         if (cfg(priv)->ht_params &&
 608             cfg(priv)->ht_params->use_rts_for_aggregation) {
 609                 /*
 610                  * switch to RTS/CTS if it is the prefer protection
 611                  * method for HT traffic
 612                  */
 613
 614                 sta_priv->lq_sta.lq.general_params.flags |=
 615                         LINK_QUAL_FLAGS_SET_STA_TLC_RTS_MSK;
 616         }
 617         priv->agg_tids_count++;
 618         IWL_DEBUG_HT(priv, "priv->agg_tids_count = %u\n",
 619                      priv->agg_tids_count);
 620
 621         sta_priv->lq_sta.lq.agg_params.agg_frame_cnt_limit =
 622                 sta_priv->max_agg_bufsize;
 623
 624         IWL_DEBUG_HT(priv, "Tx aggregation enabled on ra = %pM tid = %d\n",
 625                  sta->addr, tid);
 626
 627         return iwl_send_lq_cmd(priv, ctx,
 628                         &sta_priv->lq_sta.lq, CMD_ASYNC, false);
 629 }
 630
 631 static void iwlagn_check_ratid_empty(struct iwl_priv *priv, int sta_id, u8 tid)
 632 {
 633         struct iwl_tid_data *tid_data = &priv->tid_data[sta_id][tid];
 634         enum iwl_rxon_context_id ctx;
 635         struct ieee80211_vif *vif;
 636         u8 *addr;
 637
 638         lockdep_assert_held(&priv->shrd->sta_lock);
 639
 640         addr = priv->stations[sta_id].sta.sta.addr;
 641         ctx = priv->stations[sta_id].ctxid;
 642         vif = priv->contexts[ctx].vif;
 643
 644         switch (priv->tid_data[sta_id][tid].agg.state) {
 645         case IWL_EMPTYING_HW_QUEUE_DELBA:
 646                 /* There are no packets for this RA / TID in the HW any more */
 647                 if (tid_data->agg.ssn == tid_data->next_reclaimed) {
 648                         IWL_DEBUG_TX_QUEUES(priv,
 649                                 "Can continue DELBA flow ssn = next_recl ="
 650                                 " %d", tid_data->next_reclaimed);
 651                         iwl_trans_tx_agg_disable(trans(priv), sta_id, tid);
 652                         tid_data->agg.state = IWL_AGG_OFF;
 653                         ieee80211_stop_tx_ba_cb_irqsafe(vif, addr, tid);
 654                 }
 655                 break;
 656         case IWL_EMPTYING_HW_QUEUE_ADDBA:
 657                 /* There are no packets for this RA / TID in the HW any more */
 658                 if (tid_data->agg.ssn == tid_data->next_reclaimed) {
 659                         IWL_DEBUG_TX_QUEUES(priv,
 660                                 "Can continue ADDBA flow ssn = next_recl ="
 661                                 " %d", tid_data->next_reclaimed);
 662                         tid_data->agg.state = IWL_AGG_ON;
 663                         ieee80211_start_tx_ba_cb_irqsafe(vif, addr, tid);
 664                 }
 665                 break;
 666         default:
 667                 break;
 668         }
 669 }
 670
 671 static void iwlagn_non_agg_tx_status(struct iwl_priv *priv,
 672                                      struct iwl_rxon_context *ctx,
 673                                      const u8 *addr1)
 674 {
 675         struct ieee80211_sta *sta;
 676         struct iwl_station_priv *sta_priv;
 677
 678         rcu_read_lock();
 679         sta = ieee80211_find_sta(ctx->vif, addr1);
 680         if (sta) {
 681                 sta_priv = (void *)sta->drv_priv;
 682                 /* avoid atomic ops if this isn't a client */
 683                 if (sta_priv->client &&
 684                     atomic_dec_return(&sta_priv->pending_frames) == 0)
 685                         ieee80211_sta_block_awake(priv->hw, sta, false);
 686         }
 687         rcu_read_unlock();
 688 }
 689
 690 /**
 691  * translate ucode response to mac80211 tx status control values
 692  */
 693 static void iwlagn_hwrate_to_tx_control(struct iwl_priv *priv, u32 rate_n_flags,
 694                                   struct ieee80211_tx_info *info)
 695 {
 696         struct ieee80211_tx_rate *r = &info->control.rates[0];
 697
 698         info->antenna_sel_tx =
 699                 ((rate_n_flags & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS);
 700         if (rate_n_flags & RATE_MCS_HT_MSK)
 701                 r->flags |= IEEE80211_TX_RC_MCS;
 702         if (rate_n_flags & RATE_MCS_GF_MSK)
 703                 r->flags |= IEEE80211_TX_RC_GREEN_FIELD;
 704         if (rate_n_flags & RATE_MCS_HT40_MSK)
 705                 r->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
 706         if (rate_n_flags & RATE_MCS_DUP_MSK)
 707                 r->flags |= IEEE80211_TX_RC_DUP_DATA;
 708         if (rate_n_flags & RATE_MCS_SGI_MSK)
 709                 r->flags |= IEEE80211_TX_RC_SHORT_GI;
 710         r->idx = iwlagn_hwrate_to_mac80211_idx(rate_n_flags, info->band);
 711 }
 712
 713 #ifdef CONFIG_IWLWIFI_DEBUG
 714 const char *iwl_get_tx_fail_reason(u32 status)
 715 {
 716 #define TX_STATUS_FAIL(x) case TX_STATUS_FAIL_ ## x: return #x
 717 #define TX_STATUS_POSTPONE(x) case TX_STATUS_POSTPONE_ ## x: return #x
 718
 719         switch (status & TX_STATUS_MSK) {
 720         case TX_STATUS_SUCCESS:
 721                 return "SUCCESS";
 722         TX_STATUS_POSTPONE(DELAY);
 723         TX_STATUS_POSTPONE(FEW_BYTES);
 724         TX_STATUS_POSTPONE(BT_PRIO);
 725         TX_STATUS_POSTPONE(QUIET_PERIOD);
 726         TX_STATUS_POSTPONE(CALC_TTAK);
 727         TX_STATUS_FAIL(INTERNAL_CROSSED_RETRY);
 728         TX_STATUS_FAIL(SHORT_LIMIT);
 729         TX_STATUS_FAIL(LONG_LIMIT);
 730         TX_STATUS_FAIL(FIFO_UNDERRUN);
 731         TX_STATUS_FAIL(DRAIN_FLOW);
 732         TX_STATUS_FAIL(RFKILL_FLUSH);
 733         TX_STATUS_FAIL(LIFE_EXPIRE);
 734         TX_STATUS_FAIL(DEST_PS);
 735         TX_STATUS_FAIL(HOST_ABORTED);
 736         TX_STATUS_FAIL(BT_RETRY);
 737         TX_STATUS_FAIL(STA_INVALID);
 738         TX_STATUS_FAIL(FRAG_DROPPED);
 739         TX_STATUS_FAIL(TID_DISABLE);
 740         TX_STATUS_FAIL(FIFO_FLUSHED);
 741         TX_STATUS_FAIL(INSUFFICIENT_CF_POLL);
 742         TX_STATUS_FAIL(PASSIVE_NO_RX);
 743         TX_STATUS_FAIL(NO_BEACON_ON_RADAR);
 744         }
 745
 746         return "UNKNOWN";
 747
 748 #undef TX_STATUS_FAIL
 749 #undef TX_STATUS_POSTPONE
 750 }
 751 #endif /* CONFIG_IWLWIFI_DEBUG */
 752
 753 static void iwlagn_count_agg_tx_err_status(struct iwl_priv *priv, u16 status)
 754 {
 755         status &= AGG_TX_STATUS_MSK;
 756
 757         switch (status) {
 758         case AGG_TX_STATE_UNDERRUN_MSK:
 759                 priv->reply_agg_tx_stats.underrun++;
 760                 break;
 761         case AGG_TX_STATE_BT_PRIO_MSK:
 762                 priv->reply_agg_tx_stats.bt_prio++;
 763                 break;
 764         case AGG_TX_STATE_FEW_BYTES_MSK:
 765                 priv->reply_agg_tx_stats.few_bytes++;
 766                 break;
 767         case AGG_TX_STATE_ABORT_MSK:
 768                 priv->reply_agg_tx_stats.abort++;
 769                 break;
 770         case AGG_TX_STATE_LAST_SENT_TTL_MSK:
 771                 priv->reply_agg_tx_stats.last_sent_ttl++;
 772                 break;
 773         case AGG_TX_STATE_LAST_SENT_TRY_CNT_MSK:
 774                 priv->reply_agg_tx_stats.last_sent_try++;
 775                 break;
 776         case AGG_TX_STATE_LAST_SENT_BT_KILL_MSK:
 777                 priv->reply_agg_tx_stats.last_sent_bt_kill++;
 778                 break;
 779         case AGG_TX_STATE_SCD_QUERY_MSK:
 780                 priv->reply_agg_tx_stats.scd_query++;
 781                 break;
 782         case AGG_TX_STATE_TEST_BAD_CRC32_MSK:
 783                 priv->reply_agg_tx_stats.bad_crc32++;
 784                 break;
 785         case AGG_TX_STATE_RESPONSE_MSK:
 786                 priv->reply_agg_tx_stats.response++;
 787                 break;
 788         case AGG_TX_STATE_DUMP_TX_MSK:
 789                 priv->reply_agg_tx_stats.dump_tx++;
 790                 break;
 791         case AGG_TX_STATE_DELAY_TX_MSK:
 792                 priv->reply_agg_tx_stats.delay_tx++;
 793                 break;
 794         default:
 795                 priv->reply_agg_tx_stats.unknown++;
 796                 break;
 797         }
 798 }
 799
 800 static void iwl_rx_reply_tx_agg(struct iwl_priv *priv,
 801                                 struct iwlagn_tx_resp *tx_resp)
 802 {
 803         struct agg_tx_status *frame_status = &tx_resp->status;
 804         int tid = (tx_resp->ra_tid & IWLAGN_TX_RES_TID_MSK) >>
 805                 IWLAGN_TX_RES_TID_POS;
 806         int sta_id = (tx_resp->ra_tid & IWLAGN_TX_RES_RA_MSK) >>
 807                 IWLAGN_TX_RES_RA_POS;
 808         struct iwl_ht_agg *agg = &priv->tid_data[sta_id][tid].agg;
 809         u32 status = le16_to_cpu(tx_resp->status.status);
 810         int i;
 811
 812         WARN_ON(tid == IWL_TID_NON_QOS);
 813
 814         if (agg->wait_for_ba)
 815                 IWL_DEBUG_TX_REPLY(priv,
 816                         "got tx response w/o block-ack\n");
 817
 818         agg->rate_n_flags = le32_to_cpu(tx_resp->rate_n_flags);
 819         agg->wait_for_ba = (tx_resp->frame_count > 1);
 820
 821         /*
 822          * If the BT kill count is non-zero, we'll get this
 823          * notification again.
 824          */
 825         if (tx_resp->bt_kill_count && tx_resp->frame_count == 1 &&
 826             cfg(priv)->bt_params &&
 827             cfg(priv)->bt_params->advanced_bt_coexist) {
 828                 IWL_DEBUG_COEX(priv, "receive reply tx w/ bt_kill\n");
 829         }
 830
 831         if (tx_resp->frame_count == 1)
 832                 return;
 833
 834         /* Construct bit-map of pending frames within Tx window */
 835         for (i = 0; i < tx_resp->frame_count; i++) {
 836                 u16 fstatus = le16_to_cpu(frame_status[i].status);
 837
 838                 if (status & AGG_TX_STATUS_MSK)
 839                         iwlagn_count_agg_tx_err_status(priv, fstatus);
 840
 841                 if (status & (AGG_TX_STATE_FEW_BYTES_MSK |
 842                               AGG_TX_STATE_ABORT_MSK))
 843                         continue;
 844
 845                 IWL_DEBUG_TX_REPLY(priv, "status %s (0x%08x), "
 846                                    "try-count (0x%08x)\n",
 847                                    iwl_get_agg_tx_fail_reason(fstatus),
 848                                    fstatus & AGG_TX_STATUS_MSK,
 849                                    fstatus & AGG_TX_TRY_MSK);
 850         }
 851 }
 852
 853 #ifdef CONFIG_IWLWIFI_DEBUG
 854 #define AGG_TX_STATE_FAIL(x) case AGG_TX_STATE_ ## x: return #x
 855
 856 const char *iwl_get_agg_tx_fail_reason(u16 status)
 857 {
 858         status &= AGG_TX_STATUS_MSK;
 859         switch (status) {
 860         case AGG_TX_STATE_TRANSMITTED:
 861                 return "SUCCESS";
 862                 AGG_TX_STATE_FAIL(UNDERRUN_MSK);
 863                 AGG_TX_STATE_FAIL(BT_PRIO_MSK);
 864                 AGG_TX_STATE_FAIL(FEW_BYTES_MSK);
 865                 AGG_TX_STATE_FAIL(ABORT_MSK);
 866                 AGG_TX_STATE_FAIL(LAST_SENT_TTL_MSK);
 867                 AGG_TX_STATE_FAIL(LAST_SENT_TRY_CNT_MSK);
 868                 AGG_TX_STATE_FAIL(LAST_SENT_BT_KILL_MSK);
 869                 AGG_TX_STATE_FAIL(SCD_QUERY_MSK);
 870                 AGG_TX_STATE_FAIL(TEST_BAD_CRC32_MSK);
 871                 AGG_TX_STATE_FAIL(RESPONSE_MSK);
 872                 AGG_TX_STATE_FAIL(DUMP_TX_MSK);
 873                 AGG_TX_STATE_FAIL(DELAY_TX_MSK);
 874         }
 875
 876         return "UNKNOWN";
 877 }
 878 #endif /* CONFIG_IWLWIFI_DEBUG */
 879
 880 static inline u32 iwlagn_get_scd_ssn(struct iwlagn_tx_resp *tx_resp)
 881 {
 882         return le32_to_cpup((__le32 *)&tx_resp->status +
 883                             tx_resp->frame_count) & MAX_SN;
 884 }
 885
 886 static void iwlagn_count_tx_err_status(struct iwl_priv *priv, u16 status)
 887 {
 888         status &= TX_STATUS_MSK;
 889
 890         switch (status) {
 891         case TX_STATUS_POSTPONE_DELAY:
 892                 priv->reply_tx_stats.pp_delay++;
 893                 break;
 894         case TX_STATUS_POSTPONE_FEW_BYTES:
 895                 priv->reply_tx_stats.pp_few_bytes++;
 896                 break;
 897         case TX_STATUS_POSTPONE_BT_PRIO:
 898                 priv->reply_tx_stats.pp_bt_prio++;
 899                 break;
 900         case TX_STATUS_POSTPONE_QUIET_PERIOD:
 901                 priv->reply_tx_stats.pp_quiet_period++;
 902                 break;
 903         case TX_STATUS_POSTPONE_CALC_TTAK:
 904                 priv->reply_tx_stats.pp_calc_ttak++;
 905                 break;
 906         case TX_STATUS_FAIL_INTERNAL_CROSSED_RETRY:
 907                 priv->reply_tx_stats.int_crossed_retry++;
 908                 break;
 909         case TX_STATUS_FAIL_SHORT_LIMIT:
 910                 priv->reply_tx_stats.short_limit++;
 911                 break;
 912         case TX_STATUS_FAIL_LONG_LIMIT:
 913                 priv->reply_tx_stats.long_limit++;
 914                 break;
 915         case TX_STATUS_FAIL_FIFO_UNDERRUN:
 916                 priv->reply_tx_stats.fifo_underrun++;
 917                 break;
 918         case TX_STATUS_FAIL_DRAIN_FLOW:
 919                 priv->reply_tx_stats.drain_flow++;
 920                 break;
 921         case TX_STATUS_FAIL_RFKILL_FLUSH:
 922                 priv->reply_tx_stats.rfkill_flush++;
 923                 break;
 924         case TX_STATUS_FAIL_LIFE_EXPIRE:
 925                 priv->reply_tx_stats.life_expire++;
 926                 break;
 927         case TX_STATUS_FAIL_DEST_PS:
 928                 priv->reply_tx_stats.dest_ps++;
 929                 break;
 930         case TX_STATUS_FAIL_HOST_ABORTED:
 931                 priv->reply_tx_stats.host_abort++;
 932                 break;
 933         case TX_STATUS_FAIL_BT_RETRY:
 934                 priv->reply_tx_stats.bt_retry++;
 935                 break;
 936         case TX_STATUS_FAIL_STA_INVALID:
 937                 priv->reply_tx_stats.sta_invalid++;
 938                 break;
 939         case TX_STATUS_FAIL_FRAG_DROPPED:
 940                 priv->reply_tx_stats.frag_drop++;
 941                 break;
 942         case TX_STATUS_FAIL_TID_DISABLE:
 943                 priv->reply_tx_stats.tid_disable++;
 944                 break;
 945         case TX_STATUS_FAIL_FIFO_FLUSHED:
 946                 priv->reply_tx_stats.fifo_flush++;
 947                 break;
 948         case TX_STATUS_FAIL_INSUFFICIENT_CF_POLL:
 949                 priv->reply_tx_stats.insuff_cf_poll++;
 950                 break;
 951         case TX_STATUS_FAIL_PASSIVE_NO_RX:
 952                 priv->reply_tx_stats.fail_hw_drop++;
 953                 break;
 954         case TX_STATUS_FAIL_NO_BEACON_ON_RADAR:
 955                 priv->reply_tx_stats.sta_color_mismatch++;
 956                 break;
 957         default:
 958                 priv->reply_tx_stats.unknown++;
 959                 break;
 960         }
 961 }
 962
 963 static void iwlagn_set_tx_status(struct iwl_priv *priv,
 964                                  struct ieee80211_tx_info *info,
 965                                  struct iwlagn_tx_resp *tx_resp,
 966                                  bool is_agg)
 967 {
 968         u16  status = le16_to_cpu(tx_resp->status.status);
 969
 970         info->status.rates[0].count = tx_resp->failure_frame + 1;
 971         if (is_agg)
 972                 info->flags &= ~IEEE80211_TX_CTL_AMPDU;
 973         info->flags |= iwl_tx_status_to_mac80211(status);
 974         iwlagn_hwrate_to_tx_control(priv, le32_to_cpu(tx_resp->rate_n_flags),
 975                                     info);
 976         if (!iwl_is_tx_success(status))
 977                 iwlagn_count_tx_err_status(priv, status);
 978 }
 979
 980 static void iwl_check_abort_status(struct iwl_priv *priv,
 981                             u8 frame_count, u32 status)
 982 {
 983         if (frame_count == 1 && status == TX_STATUS_FAIL_RFKILL_FLUSH) {
 984                 IWL_ERR(priv, "Tx flush command to flush out all frames\n");
 985                 if (!test_bit(STATUS_EXIT_PENDING, &priv->shrd->status))
 986                         queue_work(priv->shrd->workqueue, &priv->tx_flush);
 987         }
 988 }
 989
 990 int iwlagn_rx_reply_tx(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb,
 991                                struct iwl_device_cmd *cmd)
 992 {
 993         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 994         u16 sequence = le16_to_cpu(pkt->hdr.sequence);
 995         int txq_id = SEQ_TO_QUEUE(sequence);
 996         int cmd_index __maybe_unused = SEQ_TO_INDEX(sequence);
 997         struct iwlagn_tx_resp *tx_resp = (void *)&pkt->u.raw[0];
 998         struct ieee80211_hdr *hdr;
 999         u32 status = le16_to_cpu(tx_resp->status.status);
1000         u16 ssn = iwlagn_get_scd_ssn(tx_resp);
1001         int tid;
1002         int sta_id;
1003         int freed;
1004         struct ieee80211_tx_info *info;
1005         unsigned long flags;
1006         struct sk_buff_head skbs;
1007         struct sk_buff *skb;
1008         struct iwl_rxon_context *ctx;
1009         bool is_agg = (txq_id >= IWLAGN_FIRST_AMPDU_QUEUE);
1010
1011         tid = (tx_resp->ra_tid & IWLAGN_TX_RES_TID_MSK) >>
1012                 IWLAGN_TX_RES_TID_POS;
1013         sta_id = (tx_resp->ra_tid & IWLAGN_TX_RES_RA_MSK) >>
1014                 IWLAGN_TX_RES_RA_POS;
1015
1016         spin_lock_irqsave(&priv->shrd->sta_lock, flags);
1017
1018         if (is_agg)
1019                 iwl_rx_reply_tx_agg(priv, tx_resp);
1020
1021         if (tx_resp->frame_count == 1) {
1022                 u16 next_reclaimed = le16_to_cpu(tx_resp->seq_ctl);
1023                 next_reclaimed = SEQ_TO_SN(next_reclaimed + 0x10);
1024
1025                 if (is_agg) {
1026                         /* If this is an aggregation queue, we can rely on the
1027                          * ssn since the wifi sequence number corresponds to
1028                          * the index in the TFD ring (%256).
1029                          * The seq_ctl is the sequence control of the packet
1030                          * to which this Tx response relates. But if there is a
1031                          * hole in the bitmap of the BA we received, this Tx
1032                          * response may allow to reclaim the hole and all the
1033                          * subsequent packets that were already acked.
1034                          * In that case, seq_ctl != ssn, and the next packet
1035                          * to be reclaimed will be ssn and not seq_ctl.
1036                          */
1037                         next_reclaimed = ssn;
1038                 }
1039
1040                 __skb_queue_head_init(&skbs);
1041
1042                 if (tid != IWL_TID_NON_QOS) {
1043                         priv->tid_data[sta_id][tid].next_reclaimed =
1044                                 next_reclaimed;
1045                         IWL_DEBUG_TX_REPLY(priv, "Next reclaimed packet:%d",
1046                                                   next_reclaimed);
1047                 }
1048
1049                 /*we can free until ssn % q.n_bd not inclusive */
1050                 WARN_ON(iwl_trans_reclaim(trans(priv), sta_id, tid, txq_id,
1051                                   ssn, status, &skbs));
1052                 iwlagn_check_ratid_empty(priv, sta_id, tid);
1053                 freed = 0;
1054                 while (!skb_queue_empty(&skbs)) {
1055                         skb = __skb_dequeue(&skbs);
1056                         hdr = (struct ieee80211_hdr *)skb->data;
1057
1058                         if (!ieee80211_is_data_qos(hdr->frame_control))
1059                                 priv->last_seq_ctl = tx_resp->seq_ctl;
1060
1061                         info = IEEE80211_SKB_CB(skb);
1062                         ctx = info->driver_data[0];
1063                         kmem_cache_free(priv->tx_cmd_pool,
1064                                         (info->driver_data[1]));
1065
1066                         memset(&info->status, 0, sizeof(info->status));
1067
1068                         if (status == TX_STATUS_FAIL_PASSIVE_NO_RX &&
1069                             iwl_is_associated_ctx(ctx) && ctx->vif &&
1070                             ctx->vif->type == NL80211_IFTYPE_STATION) {
1071                                 ctx->last_tx_rejected = true;
1072                                 iwl_trans_stop_queue(trans(priv), txq_id,
1073                                         "Tx on passive channel");
1074
1075                                 IWL_DEBUG_TX_REPLY(priv,
1076                                            "TXQ %d status %s (0x%08x) "
1077                                            "rate_n_flags 0x%x retries %d\n",
1078                                            txq_id,
1079                                            iwl_get_tx_fail_reason(status),
1080                                            status,
1081                                            le32_to_cpu(tx_resp->rate_n_flags),
1082                                            tx_resp->failure_frame);
1083
1084                                 IWL_DEBUG_TX_REPLY(priv,
1085                                            "FrameCnt = %d, idx=%d\n",
1086                                            tx_resp->frame_count, cmd_index);
1087                         }
1088
1089                         /* check if BAR is needed */
1090                         if (is_agg && !iwl_is_tx_success(status))
1091                                 info->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK;
1092                         iwlagn_set_tx_status(priv, IEEE80211_SKB_CB(skb),
1093                                      tx_resp, is_agg);
1094                         if (!is_agg)
1095                                 iwlagn_non_agg_tx_status(priv, ctx, hdr->addr1);
1096
1097                         ieee80211_tx_status_irqsafe(priv->hw, skb);
1098
1099                         freed++;
1100                 }
1101
1102                 WARN_ON(!is_agg && freed != 1);
1103         }
1104
1105         iwl_check_abort_status(priv, tx_resp->frame_count, status);
1106         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
1107         return 0;
1108 }
1109
1110 /**
1111  * iwlagn_rx_reply_compressed_ba - Handler for REPLY_COMPRESSED_BA
1112  *
1113  * Handles block-acknowledge notification from device, which reports success
1114  * of frames sent via aggregation.
1115  */
1116 int iwlagn_rx_reply_compressed_ba(struct iwl_priv *priv,
1117                                    struct iwl_rx_mem_buffer *rxb,
1118                                    struct iwl_device_cmd *cmd)
1119 {
1120         struct iwl_rx_packet *pkt = rxb_addr(rxb);
1121         struct iwl_compressed_ba_resp *ba_resp = &pkt->u.compressed_ba;
1122         struct iwl_ht_agg *agg;
1123         struct sk_buff_head reclaimed_skbs;
1124         struct ieee80211_tx_info *info;
1125         struct ieee80211_hdr *hdr;
1126         struct sk_buff *skb;
1127         unsigned long flags;
1128         int sta_id;
1129         int tid;
1130         int freed;
1131
1132         /* "flow" corresponds to Tx queue */
1133         u16 scd_flow = le16_to_cpu(ba_resp->scd_flow);
1134
1135         /* "ssn" is start of block-ack Tx window, corresponds to index
1136          * (in Tx queue's circular buffer) of first TFD/frame in window */
1137         u16 ba_resp_scd_ssn = le16_to_cpu(ba_resp->scd_ssn);
1138
1139         if (scd_flow >= hw_params(priv).max_txq_num) {
1140                 IWL_ERR(priv,
1141                         "BUG_ON scd_flow is bigger than number of queues\n");
1142                 return 0;
1143         }
1144
1145         sta_id = ba_resp->sta_id;
1146         tid = ba_resp->tid;
1147         agg = &priv->tid_data[sta_id][tid].agg;
1148
1149         spin_lock_irqsave(&priv->shrd->sta_lock, flags);
1150
1151         if (unlikely(!agg->wait_for_ba)) {
1152                 if (unlikely(ba_resp->bitmap))
1153                         IWL_ERR(priv, "Received BA when not expected\n");
1154                 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
1155                 return 0;
1156         }
1157
1158         __skb_queue_head_init(&reclaimed_skbs);
1159
1160         /* Release all TFDs before the SSN, i.e. all TFDs in front of
1161          * block-ack window (we assume that they've been successfully
1162          * transmitted ... if not, it's too late anyway). */
1163         if (iwl_trans_reclaim(trans(priv), sta_id, tid, scd_flow,
1164                               ba_resp_scd_ssn, 0, &reclaimed_skbs)) {
1165                 spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
1166                 return 0;
1167         }
1168
1169         IWL_DEBUG_TX_REPLY(priv, "REPLY_COMPRESSED_BA [%d] Received from %pM, "
1170                            "sta_id = %d\n",
1171                            agg->wait_for_ba,
1172                            (u8 *) &ba_resp->sta_addr_lo32,
1173                            ba_resp->sta_id);
1174         IWL_DEBUG_TX_REPLY(priv, "TID = %d, SeqCtl = %d, bitmap = 0x%llx, "
1175                            "scd_flow = %d, scd_ssn = %d\n",
1176                            ba_resp->tid, le16_to_cpu(ba_resp->seq_ctl),
1177                            (unsigned long long)le64_to_cpu(ba_resp->bitmap),
1178                            scd_flow, ba_resp_scd_ssn);
1179
1180         /* Mark that the expected block-ack response arrived */
1181         agg->wait_for_ba = false;
1182
1183         /* Sanity check values reported by uCode */
1184         if (ba_resp->txed_2_done > ba_resp->txed) {
1185                 IWL_DEBUG_TX_REPLY(priv,
1186                         "bogus sent(%d) and ack(%d) count\n",
1187                         ba_resp->txed, ba_resp->txed_2_done);
1188                 /*
1189                  * set txed_2_done = txed,
1190                  * so it won't impact rate scale
1191                  */
1192                 ba_resp->txed = ba_resp->txed_2_done;
1193         }
1194         IWL_DEBUG_HT(priv, "agg frames sent:%d, acked:%d\n",
1195                         ba_resp->txed, ba_resp->txed_2_done);
1196
1197         priv->tid_data[sta_id][tid].next_reclaimed = ba_resp_scd_ssn;
1198
1199         iwlagn_check_ratid_empty(priv, sta_id, tid);
1200         freed = 0;
1201         while (!skb_queue_empty(&reclaimed_skbs)) {
1202
1203                 skb = __skb_dequeue(&reclaimed_skbs);
1204                 hdr = (struct ieee80211_hdr *)skb->data;
1205
1206                 if (ieee80211_is_data_qos(hdr->frame_control))
1207                         freed++;
1208                 else
1209                         WARN_ON_ONCE(1);
1210
1211                 info = IEEE80211_SKB_CB(skb);
1212                 kmem_cache_free(priv->tx_cmd_pool, (info->driver_data[1]));
1213
1214                 if (freed == 1) {
1215                         /* this is the first skb we deliver in this batch */
1216                         /* put the rate scaling data there */
1217                         info = IEEE80211_SKB_CB(skb);
1218                         memset(&info->status, 0, sizeof(info->status));
1219                         info->flags |= IEEE80211_TX_STAT_ACK;
1220                         info->flags |= IEEE80211_TX_STAT_AMPDU;
1221                         info->status.ampdu_ack_len = ba_resp->txed_2_done;
1222                         info->status.ampdu_len = ba_resp->txed;
1223                         iwlagn_hwrate_to_tx_control(priv, agg->rate_n_flags,
1224                                                     info);
1225                 }
1226
1227                 ieee80211_tx_status_irqsafe(priv->hw, skb);
1228         }
1229
1230         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
1231         return 0;
1232 }