drivers/net/wireless/iwlwifi/iwl-trans-tx-pcie.c

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2003 - 2011 Intel Corporation. All rights reserved.
   4  *
   5  * Portions of this file are derived from the ipw3945 project, as well
   6  * as portions of the ieee80211 subsystem header files.
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of version 2 of the GNU General Public License as
  10  * published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but WITHOUT
  13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  15  * more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along with
  18  * this program; if not, write to the Free Software Foundation, Inc.,
  19  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  20  *
  21  * The full GNU General Public License is included in this distribution in the
  22  * file called LICENSE.
  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 #include <linux/etherdevice.h>
  30 #include <linux/slab.h>
  31 #include <linux/sched.h>
  32 #include <net/mac80211.h>
  33
  34 #include "iwl-agn.h"
  35 #include "iwl-dev.h"
  36 #include "iwl-core.h"
  37 #include "iwl-io.h"
  38 #include "iwl-helpers.h"
  39 #include "iwl-trans-int-pcie.h"
  40
  41 /**
  42  * iwl_trans_txq_update_byte_cnt_tbl - Set up entry in Tx byte-count array
  43  */
  44 void iwl_trans_txq_update_byte_cnt_tbl(struct iwl_priv *priv,
  45                                            struct iwl_tx_queue *txq,
  46                                            u16 byte_cnt)
  47 {
  48         struct iwlagn_scd_bc_tbl *scd_bc_tbl = priv->scd_bc_tbls.addr;
  49         int write_ptr = txq->q.write_ptr;
  50         int txq_id = txq->q.id;
  51         u8 sec_ctl = 0;
  52         u8 sta_id = 0;
  53         u16 len = byte_cnt + IWL_TX_CRC_SIZE + IWL_TX_DELIMITER_SIZE;
  54         __le16 bc_ent;
  55
  56         WARN_ON(len > 0xFFF || write_ptr >= TFD_QUEUE_SIZE_MAX);
  57
  58         sta_id = txq->cmd[txq->q.write_ptr]->cmd.tx.sta_id;
  59         sec_ctl = txq->cmd[txq->q.write_ptr]->cmd.tx.sec_ctl;
  60
  61         switch (sec_ctl & TX_CMD_SEC_MSK) {
  62         case TX_CMD_SEC_CCM:
  63                 len += CCMP_MIC_LEN;
  64                 break;
  65         case TX_CMD_SEC_TKIP:
  66                 len += TKIP_ICV_LEN;
  67                 break;
  68         case TX_CMD_SEC_WEP:
  69                 len += WEP_IV_LEN + WEP_ICV_LEN;
  70                 break;
  71         }
  72
  73         bc_ent = cpu_to_le16((len & 0xFFF) | (sta_id << 12));
  74
  75         scd_bc_tbl[txq_id].tfd_offset[write_ptr] = bc_ent;
  76
  77         if (write_ptr < TFD_QUEUE_SIZE_BC_DUP)
  78                 scd_bc_tbl[txq_id].
  79                         tfd_offset[TFD_QUEUE_SIZE_MAX + write_ptr] = bc_ent;
  80 }
  81
  82 /**
  83  * iwl_txq_update_write_ptr - Send new write index to hardware
  84  */
  85 void iwl_txq_update_write_ptr(struct iwl_priv *priv, struct iwl_tx_queue *txq)
  86 {
  87         u32 reg = 0;
  88         int txq_id = txq->q.id;
  89
  90         if (txq->need_update == 0)
  91                 return;
  92
  93         if (priv->cfg->base_params->shadow_reg_enable) {
  94                 /* shadow register enabled */
  95                 iwl_write32(priv, HBUS_TARG_WRPTR,
  96                             txq->q.write_ptr | (txq_id << 8));
  97         } else {
  98                 /* if we're trying to save power */
  99                 if (test_bit(STATUS_POWER_PMI, &priv->shrd->status)) {
 100                         /* wake up nic if it's powered down ...
 101                          * uCode will wake up, and interrupt us again, so next
 102                          * time we'll skip this part. */
 103                         reg = iwl_read32(priv, CSR_UCODE_DRV_GP1);
 104
 105                         if (reg & CSR_UCODE_DRV_GP1_BIT_MAC_SLEEP) {
 106                                 IWL_DEBUG_INFO(priv,
 107                                         "Tx queue %d requesting wakeup,"
 108                                         " GP1 = 0x%x\n", txq_id, reg);
 109                                 iwl_set_bit(priv, CSR_GP_CNTRL,
 110                                         CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
 111                                 return;
 112                         }
 113
 114                         iwl_write_direct32(priv, HBUS_TARG_WRPTR,
 115                                      txq->q.write_ptr | (txq_id << 8));
 116
 117                 /*
 118                  * else not in power-save mode,
 119                  * uCode will never sleep when we're
 120                  * trying to tx (during RFKILL, we're not trying to tx).
 121                  */
 122                 } else
 123                         iwl_write32(priv, HBUS_TARG_WRPTR,
 124                                     txq->q.write_ptr | (txq_id << 8));
 125         }
 126         txq->need_update = 0;
 127 }
 128
 129 static inline dma_addr_t iwl_tfd_tb_get_addr(struct iwl_tfd *tfd, u8 idx)
 130 {
 131         struct iwl_tfd_tb *tb = &tfd->tbs[idx];
 132
 133         dma_addr_t addr = get_unaligned_le32(&tb->lo);
 134         if (sizeof(dma_addr_t) > sizeof(u32))
 135                 addr |=
 136                 ((dma_addr_t)(le16_to_cpu(tb->hi_n_len) & 0xF) << 16) << 16;
 137
 138         return addr;
 139 }
 140
 141 static inline u16 iwl_tfd_tb_get_len(struct iwl_tfd *tfd, u8 idx)
 142 {
 143         struct iwl_tfd_tb *tb = &tfd->tbs[idx];
 144
 145         return le16_to_cpu(tb->hi_n_len) >> 4;
 146 }
 147
 148 static inline void iwl_tfd_set_tb(struct iwl_tfd *tfd, u8 idx,
 149                                   dma_addr_t addr, u16 len)
 150 {
 151         struct iwl_tfd_tb *tb = &tfd->tbs[idx];
 152         u16 hi_n_len = len << 4;
 153
 154         put_unaligned_le32(addr, &tb->lo);
 155         if (sizeof(dma_addr_t) > sizeof(u32))
 156                 hi_n_len |= ((addr >> 16) >> 16) & 0xF;
 157
 158         tb->hi_n_len = cpu_to_le16(hi_n_len);
 159
 160         tfd->num_tbs = idx + 1;
 161 }
 162
 163 static inline u8 iwl_tfd_get_num_tbs(struct iwl_tfd *tfd)
 164 {
 165         return tfd->num_tbs & 0x1f;
 166 }
 167
 168 static void iwlagn_unmap_tfd(struct iwl_priv *priv, struct iwl_cmd_meta *meta,
 169                      struct iwl_tfd *tfd, enum dma_data_direction dma_dir)
 170 {
 171         int i;
 172         int num_tbs;
 173
 174         /* Sanity check on number of chunks */
 175         num_tbs = iwl_tfd_get_num_tbs(tfd);
 176
 177         if (num_tbs >= IWL_NUM_OF_TBS) {
 178                 IWL_ERR(priv, "Too many chunks: %i\n", num_tbs);
 179                 /* @todo issue fatal error, it is quite serious situation */
 180                 return;
 181         }
 182
 183         /* Unmap tx_cmd */
 184         if (num_tbs)
 185                 dma_unmap_single(priv->bus->dev,
 186                                 dma_unmap_addr(meta, mapping),
 187                                 dma_unmap_len(meta, len),
 188                                 DMA_BIDIRECTIONAL);
 189
 190         /* Unmap chunks, if any. */
 191         for (i = 1; i < num_tbs; i++)
 192                 dma_unmap_single(priv->bus->dev, iwl_tfd_tb_get_addr(tfd, i),
 193                                 iwl_tfd_tb_get_len(tfd, i), dma_dir);
 194 }
 195
 196 /**
 197  * iwlagn_txq_free_tfd - Free all chunks referenced by TFD [txq->q.read_ptr]
 198  * @priv - driver private data
 199  * @txq - tx queue
 200  * @index - the index of the TFD to be freed
 201  *
 202  * Does NOT advance any TFD circular buffer read/write indexes
 203  * Does NOT free the TFD itself (which is within circular buffer)
 204  */
 205 void iwlagn_txq_free_tfd(struct iwl_priv *priv, struct iwl_tx_queue *txq,
 206         int index)
 207 {
 208         struct iwl_tfd *tfd_tmp = txq->tfds;
 209
 210         iwlagn_unmap_tfd(priv, &txq->meta[index], &tfd_tmp[index],
 211                          DMA_TO_DEVICE);
 212
 213         /* free SKB */
 214         if (txq->txb) {
 215                 struct sk_buff *skb;
 216
 217                 skb = txq->txb[index].skb;
 218
 219                 /* can be called from irqs-disabled context */
 220                 if (skb) {
 221                         dev_kfree_skb_any(skb);
 222                         txq->txb[index].skb = NULL;
 223                 }
 224         }
 225 }
 226
 227 int iwlagn_txq_attach_buf_to_tfd(struct iwl_priv *priv,
 228                                  struct iwl_tx_queue *txq,
 229                                  dma_addr_t addr, u16 len,
 230                                  u8 reset)
 231 {
 232         struct iwl_queue *q;
 233         struct iwl_tfd *tfd, *tfd_tmp;
 234         u32 num_tbs;
 235
 236         q = &txq->q;
 237         tfd_tmp = txq->tfds;
 238         tfd = &tfd_tmp[q->write_ptr];
 239
 240         if (reset)
 241                 memset(tfd, 0, sizeof(*tfd));
 242
 243         num_tbs = iwl_tfd_get_num_tbs(tfd);
 244
 245         /* Each TFD can point to a maximum 20 Tx buffers */
 246         if (num_tbs >= IWL_NUM_OF_TBS) {
 247                 IWL_ERR(priv, "Error can not send more than %d chunks\n",
 248                           IWL_NUM_OF_TBS);
 249                 return -EINVAL;
 250         }
 251
 252         if (WARN_ON(addr & ~DMA_BIT_MASK(36)))
 253                 return -EINVAL;
 254
 255         if (unlikely(addr & ~IWL_TX_DMA_MASK))
 256                 IWL_ERR(priv, "Unaligned address = %llx\n",
 257                           (unsigned long long)addr);
 258
 259         iwl_tfd_set_tb(tfd, num_tbs, addr, len);
 260
 261         return 0;
 262 }
 263
 264 /*************** DMA-QUEUE-GENERAL-FUNCTIONS  *****
 265  * DMA services
 266  *
 267  * Theory of operation
 268  *
 269  * A Tx or Rx queue resides in host DRAM, and is comprised of a circular buffer
 270  * of buffer descriptors, each of which points to one or more data buffers for
 271  * the device to read from or fill.  Driver and device exchange status of each
 272  * queue via "read" and "write" pointers.  Driver keeps minimum of 2 empty
 273  * entries in each circular buffer, to protect against confusing empty and full
 274  * queue states.
 275  *
 276  * The device reads or writes the data in the queues via the device's several
 277  * DMA/FIFO channels.  Each queue is mapped to a single DMA channel.
 278  *
 279  * For Tx queue, there are low mark and high mark limits. If, after queuing
 280  * the packet for Tx, free space become < low mark, Tx queue stopped. When
 281  * reclaiming packets (on 'tx done IRQ), if free space become > high mark,
 282  * Tx queue resumed.
 283  *
 284  ***************************************************/
 285
 286 int iwl_queue_space(const struct iwl_queue *q)
 287 {
 288         int s = q->read_ptr - q->write_ptr;
 289
 290         if (q->read_ptr > q->write_ptr)
 291                 s -= q->n_bd;
 292
 293         if (s <= 0)
 294                 s += q->n_window;
 295         /* keep some reserve to not confuse empty and full situations */
 296         s -= 2;
 297         if (s < 0)
 298                 s = 0;
 299         return s;
 300 }
 301
 302 /**
 303  * iwl_queue_init - Initialize queue's high/low-water and read/write indexes
 304  */
 305 int iwl_queue_init(struct iwl_priv *priv, struct iwl_queue *q,
 306                           int count, int slots_num, u32 id)
 307 {
 308         q->n_bd = count;
 309         q->n_window = slots_num;
 310         q->id = id;
 311
 312         /* count must be power-of-two size, otherwise iwl_queue_inc_wrap
 313          * and iwl_queue_dec_wrap are broken. */
 314         if (WARN_ON(!is_power_of_2(count)))
 315                 return -EINVAL;
 316
 317         /* slots_num must be power-of-two size, otherwise
 318          * get_cmd_index is broken. */
 319         if (WARN_ON(!is_power_of_2(slots_num)))
 320                 return -EINVAL;
 321
 322         q->low_mark = q->n_window / 4;
 323         if (q->low_mark < 4)
 324                 q->low_mark = 4;
 325
 326         q->high_mark = q->n_window / 8;
 327         if (q->high_mark < 2)
 328                 q->high_mark = 2;
 329
 330         q->write_ptr = q->read_ptr = 0;
 331
 332         return 0;
 333 }
 334
 335 /*TODO: this functions should NOT be exported from trans module - export it
 336  * until the reclaim flow will be brought to the transport module too.
 337  * Add a declaration to make sparse happy */
 338 void iwlagn_txq_inval_byte_cnt_tbl(struct iwl_priv *priv,
 339                                           struct iwl_tx_queue *txq);
 340
 341 void iwlagn_txq_inval_byte_cnt_tbl(struct iwl_priv *priv,
 342                                           struct iwl_tx_queue *txq)
 343 {
 344         struct iwlagn_scd_bc_tbl *scd_bc_tbl = priv->scd_bc_tbls.addr;
 345         int txq_id = txq->q.id;
 346         int read_ptr = txq->q.read_ptr;
 347         u8 sta_id = 0;
 348         __le16 bc_ent;
 349
 350         WARN_ON(read_ptr >= TFD_QUEUE_SIZE_MAX);
 351
 352         if (txq_id != priv->shrd->cmd_queue)
 353                 sta_id = txq->cmd[read_ptr]->cmd.tx.sta_id;
 354
 355         bc_ent = cpu_to_le16(1 | (sta_id << 12));
 356         scd_bc_tbl[txq_id].tfd_offset[read_ptr] = bc_ent;
 357
 358         if (read_ptr < TFD_QUEUE_SIZE_BC_DUP)
 359                 scd_bc_tbl[txq_id].
 360                         tfd_offset[TFD_QUEUE_SIZE_MAX + read_ptr] = bc_ent;
 361 }
 362
 363 static int iwlagn_tx_queue_set_q2ratid(struct iwl_priv *priv, u16 ra_tid,
 364                                         u16 txq_id)
 365 {
 366         u32 tbl_dw_addr;
 367         u32 tbl_dw;
 368         u16 scd_q2ratid;
 369
 370         scd_q2ratid = ra_tid & SCD_QUEUE_RA_TID_MAP_RATID_MSK;
 371
 372         tbl_dw_addr = priv->scd_base_addr +
 373                         SCD_TRANS_TBL_OFFSET_QUEUE(txq_id);
 374
 375         tbl_dw = iwl_read_targ_mem(priv, tbl_dw_addr);
 376
 377         if (txq_id & 0x1)
 378                 tbl_dw = (scd_q2ratid << 16) | (tbl_dw & 0x0000FFFF);
 379         else
 380                 tbl_dw = scd_q2ratid | (tbl_dw & 0xFFFF0000);
 381
 382         iwl_write_targ_mem(priv, tbl_dw_addr, tbl_dw);
 383
 384         return 0;
 385 }
 386
 387 static void iwlagn_tx_queue_stop_scheduler(struct iwl_priv *priv, u16 txq_id)
 388 {
 389         /* Simply stop the queue, but don't change any configuration;
 390          * the SCD_ACT_EN bit is the write-enable mask for the ACTIVE bit. */
 391         iwl_write_prph(priv,
 392                 SCD_QUEUE_STATUS_BITS(txq_id),
 393                 (0 << SCD_QUEUE_STTS_REG_POS_ACTIVE)|
 394                 (1 << SCD_QUEUE_STTS_REG_POS_SCD_ACT_EN));
 395 }
 396
 397 void iwl_trans_set_wr_ptrs(struct iwl_priv *priv,
 398                                 int txq_id, u32 index)
 399 {
 400         iwl_write_direct32(priv, HBUS_TARG_WRPTR,
 401                         (index & 0xff) | (txq_id << 8));
 402         iwl_write_prph(priv, SCD_QUEUE_RDPTR(txq_id), index);
 403 }
 404
 405 void iwl_trans_tx_queue_set_status(struct iwl_priv *priv,
 406                                         struct iwl_tx_queue *txq,
 407                                         int tx_fifo_id, int scd_retry)
 408 {
 409         int txq_id = txq->q.id;
 410         int active = test_bit(txq_id, &priv->txq_ctx_active_msk) ? 1 : 0;
 411
 412         iwl_write_prph(priv, SCD_QUEUE_STATUS_BITS(txq_id),
 413                         (active << SCD_QUEUE_STTS_REG_POS_ACTIVE) |
 414                         (tx_fifo_id << SCD_QUEUE_STTS_REG_POS_TXF) |
 415                         (1 << SCD_QUEUE_STTS_REG_POS_WSL) |
 416                         SCD_QUEUE_STTS_REG_MSK);
 417
 418         txq->sched_retry = scd_retry;
 419
 420         IWL_DEBUG_INFO(priv, "%s %s Queue %d on FIFO %d\n",
 421                        active ? "Activate" : "Deactivate",
 422                        scd_retry ? "BA" : "AC/CMD", txq_id, tx_fifo_id);
 423 }
 424
 425 void iwl_trans_pcie_txq_agg_setup(struct iwl_priv *priv, int sta_id, int tid,
 426                                                 int frame_limit)
 427 {
 428         int tx_fifo, txq_id, ssn_idx;
 429         u16 ra_tid;
 430         unsigned long flags;
 431         struct iwl_tid_data *tid_data;
 432
 433         if (WARN_ON(sta_id == IWL_INVALID_STATION))
 434                 return;
 435         if (WARN_ON(tid >= MAX_TID_COUNT))
 436                 return;
 437
 438         spin_lock_irqsave(&priv->shrd->sta_lock, flags);
 439         tid_data = &priv->stations[sta_id].tid[tid];
 440         ssn_idx = SEQ_TO_SN(tid_data->seq_number);
 441         txq_id = tid_data->agg.txq_id;
 442         tx_fifo = tid_data->agg.tx_fifo;
 443         spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);
 444
 445         ra_tid = BUILD_RAxTID(sta_id, tid);
 446
 447         spin_lock_irqsave(&priv->shrd->lock, flags);
 448
 449         /* Stop this Tx queue before configuring it */
 450         iwlagn_tx_queue_stop_scheduler(priv, txq_id);
 451
 452         /* Map receiver-address / traffic-ID to this queue */
 453         iwlagn_tx_queue_set_q2ratid(priv, ra_tid, txq_id);
 454
 455         /* Set this queue as a chain-building queue */
 456         iwl_set_bits_prph(priv, SCD_QUEUECHAIN_SEL, (1<<txq_id));
 457
 458         /* enable aggregations for the queue */
 459         iwl_set_bits_prph(priv, SCD_AGGR_SEL, (1<<txq_id));
 460
 461         /* Place first TFD at index corresponding to start sequence number.
 462          * Assumes that ssn_idx is valid (!= 0xFFF) */
 463         priv->txq[txq_id].q.read_ptr = (ssn_idx & 0xff);
 464         priv->txq[txq_id].q.write_ptr = (ssn_idx & 0xff);
 465         iwl_trans_set_wr_ptrs(priv, txq_id, ssn_idx);
 466
 467         /* Set up Tx window size and frame limit for this queue */
 468         iwl_write_targ_mem(priv, priv->scd_base_addr +
 469                         SCD_CONTEXT_QUEUE_OFFSET(txq_id) +
 470                         sizeof(u32),
 471                         ((frame_limit <<
 472                         SCD_QUEUE_CTX_REG2_WIN_SIZE_POS) &
 473                         SCD_QUEUE_CTX_REG2_WIN_SIZE_MSK) |
 474                         ((frame_limit <<
 475                         SCD_QUEUE_CTX_REG2_FRAME_LIMIT_POS) &
 476                         SCD_QUEUE_CTX_REG2_FRAME_LIMIT_MSK));
 477
 478         iwl_set_bits_prph(priv, SCD_INTERRUPT_MASK, (1 << txq_id));
 479
 480         /* Set up Status area in SRAM, map to Tx DMA/FIFO, activate the queue */
 481         iwl_trans_tx_queue_set_status(priv, &priv->txq[txq_id], tx_fifo, 1);
 482
 483         priv->txq[txq_id].sta_id = sta_id;
 484         priv->txq[txq_id].tid = tid;
 485
 486         spin_unlock_irqrestore(&priv->shrd->lock, flags);
 487 }
 488
 489 int iwl_trans_pcie_txq_agg_disable(struct iwl_priv *priv, u16 txq_id,
 490                                   u16 ssn_idx, u8 tx_fifo)
 491 {
 492         if ((IWLAGN_FIRST_AMPDU_QUEUE > txq_id) ||
 493             (IWLAGN_FIRST_AMPDU_QUEUE +
 494                 priv->cfg->base_params->num_of_ampdu_queues <= txq_id)) {
 495                 IWL_ERR(priv,
 496                         "queue number out of range: %d, must be %d to %d\n",
 497                         txq_id, IWLAGN_FIRST_AMPDU_QUEUE,
 498                         IWLAGN_FIRST_AMPDU_QUEUE +
 499                         priv->cfg->base_params->num_of_ampdu_queues - 1);
 500                 return -EINVAL;
 501         }
 502
 503         iwlagn_tx_queue_stop_scheduler(priv, txq_id);
 504
 505         iwl_clear_bits_prph(priv, SCD_AGGR_SEL, (1 << txq_id));
 506
 507         priv->txq[txq_id].q.read_ptr = (ssn_idx & 0xff);
 508         priv->txq[txq_id].q.write_ptr = (ssn_idx & 0xff);
 509         /* supposes that ssn_idx is valid (!= 0xFFF) */
 510         iwl_trans_set_wr_ptrs(priv, txq_id, ssn_idx);
 511
 512         iwl_clear_bits_prph(priv, SCD_INTERRUPT_MASK, (1 << txq_id));
 513         iwl_txq_ctx_deactivate(priv, txq_id);
 514         iwl_trans_tx_queue_set_status(priv, &priv->txq[txq_id], tx_fifo, 0);
 515
 516         return 0;
 517 }
 518
 519 /*************** HOST COMMAND QUEUE FUNCTIONS   *****/
 520
 521 /**
 522  * iwl_enqueue_hcmd - enqueue a uCode command
 523  * @priv: device private data point
 524  * @cmd: a point to the ucode command structure
 525  *
 526  * The function returns < 0 values to indicate the operation is
 527  * failed. On success, it turns the index (> 0) of command in the
 528  * command queue.
 529  */
 530 static int iwl_enqueue_hcmd(struct iwl_priv *priv, struct iwl_host_cmd *cmd)
 531 {
 532         struct iwl_tx_queue *txq = &priv->txq[priv->shrd->cmd_queue];
 533         struct iwl_queue *q = &txq->q;
 534         struct iwl_device_cmd *out_cmd;
 535         struct iwl_cmd_meta *out_meta;
 536         dma_addr_t phys_addr;
 537         unsigned long flags;
 538         u32 idx;
 539         u16 copy_size, cmd_size;
 540         bool is_ct_kill = false;
 541         bool had_nocopy = false;
 542         int i;
 543         u8 *cmd_dest;
 544 #ifdef CONFIG_IWLWIFI_DEVICE_TRACING
 545         const void *trace_bufs[IWL_MAX_CMD_TFDS + 1] = {};
 546         int trace_lens[IWL_MAX_CMD_TFDS + 1] = {};
 547         int trace_idx;
 548 #endif
 549
 550         if (test_bit(STATUS_FW_ERROR, &priv->shrd->status)) {
 551                 IWL_WARN(priv, "fw recovery, no hcmd send\n");
 552                 return -EIO;
 553         }
 554
 555         if ((priv->ucode_owner == IWL_OWNERSHIP_TM) &&
 556             !(cmd->flags & CMD_ON_DEMAND)) {
 557                 IWL_DEBUG_HC(priv, "tm own the uCode, no regular hcmd send\n");
 558                 return -EIO;
 559         }
 560
 561         copy_size = sizeof(out_cmd->hdr);
 562         cmd_size = sizeof(out_cmd->hdr);
 563
 564         /* need one for the header if the first is NOCOPY */
 565         BUILD_BUG_ON(IWL_MAX_CMD_TFDS > IWL_NUM_OF_TBS - 1);
 566
 567         for (i = 0; i < IWL_MAX_CMD_TFDS; i++) {
 568                 if (!cmd->len[i])
 569                         continue;
 570                 if (cmd->dataflags[i] & IWL_HCMD_DFL_NOCOPY) {
 571                         had_nocopy = true;
 572                 } else {
 573                         /* NOCOPY must not be followed by normal! */
 574                         if (WARN_ON(had_nocopy))
 575                                 return -EINVAL;
 576                         copy_size += cmd->len[i];
 577                 }
 578                 cmd_size += cmd->len[i];
 579         }
 580
 581         /*
 582          * If any of the command structures end up being larger than
 583          * the TFD_MAX_PAYLOAD_SIZE and they aren't dynamically
 584          * allocated into separate TFDs, then we will need to
 585          * increase the size of the buffers.
 586          */
 587         if (WARN_ON(copy_size > TFD_MAX_PAYLOAD_SIZE))
 588                 return -EINVAL;
 589
 590         if (iwl_is_rfkill(priv) || iwl_is_ctkill(priv)) {
 591                 IWL_WARN(priv, "Not sending command - %s KILL\n",
 592                          iwl_is_rfkill(priv) ? "RF" : "CT");
 593                 return -EIO;
 594         }
 595
 596         spin_lock_irqsave(&priv->hcmd_lock, flags);
 597
 598         if (iwl_queue_space(q) < ((cmd->flags & CMD_ASYNC) ? 2 : 1)) {
 599                 spin_unlock_irqrestore(&priv->hcmd_lock, flags);
 600
 601                 IWL_ERR(priv, "No space in command queue\n");
 602                 is_ct_kill = iwl_check_for_ct_kill(priv);
 603                 if (!is_ct_kill) {
 604                         IWL_ERR(priv, "Restarting adapter due to queue full\n");
 605                         iwlagn_fw_error(priv, false);
 606                 }
 607                 return -ENOSPC;
 608         }
 609
 610         idx = get_cmd_index(q, q->write_ptr);
 611         out_cmd = txq->cmd[idx];
 612         out_meta = &txq->meta[idx];
 613
 614         memset(out_meta, 0, sizeof(*out_meta)); /* re-initialize to NULL */
 615         if (cmd->flags & CMD_WANT_SKB)
 616                 out_meta->source = cmd;
 617         if (cmd->flags & CMD_ASYNC)
 618                 out_meta->callback = cmd->callback;
 619
 620         /* set up the header */
 621
 622         out_cmd->hdr.cmd = cmd->id;
 623         out_cmd->hdr.flags = 0;
 624         out_cmd->hdr.sequence =
 625                 cpu_to_le16(QUEUE_TO_SEQ(priv->shrd->cmd_queue) |
 626                                          INDEX_TO_SEQ(q->write_ptr));
 627
 628         /* and copy the data that needs to be copied */
 629
 630         cmd_dest = &out_cmd->cmd.payload[0];
 631         for (i = 0; i < IWL_MAX_CMD_TFDS; i++) {
 632                 if (!cmd->len[i])
 633                         continue;
 634                 if (cmd->dataflags[i] & IWL_HCMD_DFL_NOCOPY)
 635                         break;
 636                 memcpy(cmd_dest, cmd->data[i], cmd->len[i]);
 637                 cmd_dest += cmd->len[i];
 638         }
 639
 640         IWL_DEBUG_HC(priv, "Sending command %s (#%x), seq: 0x%04X, "
 641                         "%d bytes at %d[%d]:%d\n",
 642                         get_cmd_string(out_cmd->hdr.cmd),
 643                         out_cmd->hdr.cmd,
 644                         le16_to_cpu(out_cmd->hdr.sequence), cmd_size,
 645                         q->write_ptr, idx, priv->shrd->cmd_queue);
 646
 647         phys_addr = dma_map_single(priv->bus->dev, &out_cmd->hdr, copy_size,
 648                                 DMA_BIDIRECTIONAL);
 649         if (unlikely(dma_mapping_error(priv->bus->dev, phys_addr))) {
 650                 idx = -ENOMEM;
 651                 goto out;
 652         }
 653
 654         dma_unmap_addr_set(out_meta, mapping, phys_addr);
 655         dma_unmap_len_set(out_meta, len, copy_size);
 656
 657         iwlagn_txq_attach_buf_to_tfd(priv, txq, phys_addr, copy_size, 1);
 658 #ifdef CONFIG_IWLWIFI_DEVICE_TRACING
 659         trace_bufs[0] = &out_cmd->hdr;
 660         trace_lens[0] = copy_size;
 661         trace_idx = 1;
 662 #endif
 663
 664         for (i = 0; i < IWL_MAX_CMD_TFDS; i++) {
 665                 if (!cmd->len[i])
 666                         continue;
 667                 if (!(cmd->dataflags[i] & IWL_HCMD_DFL_NOCOPY))
 668                         continue;
 669                 phys_addr = dma_map_single(priv->bus->dev, (void *)cmd->data[i],
 670                                            cmd->len[i], DMA_BIDIRECTIONAL);
 671                 if (dma_mapping_error(priv->bus->dev, phys_addr)) {
 672                         iwlagn_unmap_tfd(priv, out_meta,
 673                                          &txq->tfds[q->write_ptr],
 674                                          DMA_BIDIRECTIONAL);
 675                         idx = -ENOMEM;
 676                         goto out;
 677                 }
 678
 679                 iwlagn_txq_attach_buf_to_tfd(priv, txq, phys_addr,
 680                                              cmd->len[i], 0);
 681 #ifdef CONFIG_IWLWIFI_DEVICE_TRACING
 682                 trace_bufs[trace_idx] = cmd->data[i];
 683                 trace_lens[trace_idx] = cmd->len[i];
 684                 trace_idx++;
 685 #endif
 686         }
 687
 688         out_meta->flags = cmd->flags;
 689
 690         txq->need_update = 1;
 691
 692         /* check that tracing gets all possible blocks */
 693         BUILD_BUG_ON(IWL_MAX_CMD_TFDS + 1 != 3);
 694 #ifdef CONFIG_IWLWIFI_DEVICE_TRACING
 695         trace_iwlwifi_dev_hcmd(priv, cmd->flags,
 696                                trace_bufs[0], trace_lens[0],
 697                                trace_bufs[1], trace_lens[1],
 698                                trace_bufs[2], trace_lens[2]);
 699 #endif
 700
 701         /* Increment and update queue's write index */
 702         q->write_ptr = iwl_queue_inc_wrap(q->write_ptr, q->n_bd);
 703         iwl_txq_update_write_ptr(priv, txq);
 704
 705  out:
 706         spin_unlock_irqrestore(&priv->hcmd_lock, flags);
 707         return idx;
 708 }
 709
 710 /**
 711  * iwl_hcmd_queue_reclaim - Reclaim TX command queue entries already Tx'd
 712  *
 713  * When FW advances 'R' index, all entries between old and new 'R' index
 714  * need to be reclaimed. As result, some free space forms.  If there is
 715  * enough free space (> low mark), wake the stack that feeds us.
 716  */
 717 static void iwl_hcmd_queue_reclaim(struct iwl_priv *priv, int txq_id, int idx)
 718 {
 719         struct iwl_tx_queue *txq = &priv->txq[txq_id];
 720         struct iwl_queue *q = &txq->q;
 721         int nfreed = 0;
 722
 723         if ((idx >= q->n_bd) || (iwl_queue_used(q, idx) == 0)) {
 724                 IWL_ERR(priv, "%s: Read index for DMA queue txq id (%d), "
 725                           "index %d is out of range [0-%d] %d %d.\n", __func__,
 726                           txq_id, idx, q->n_bd, q->write_ptr, q->read_ptr);
 727                 return;
 728         }
 729
 730         for (idx = iwl_queue_inc_wrap(idx, q->n_bd); q->read_ptr != idx;
 731              q->read_ptr = iwl_queue_inc_wrap(q->read_ptr, q->n_bd)) {
 732
 733                 if (nfreed++ > 0) {
 734                         IWL_ERR(priv, "HCMD skipped: index (%d) %d %d\n", idx,
 735                                         q->write_ptr, q->read_ptr);
 736                         iwlagn_fw_error(priv, false);
 737                 }
 738
 739         }
 740 }
 741
 742 /**
 743  * iwl_tx_cmd_complete - Pull unused buffers off the queue and reclaim them
 744  * @rxb: Rx buffer to reclaim
 745  *
 746  * If an Rx buffer has an async callback associated with it the callback
 747  * will be executed.  The attached skb (if present) will only be freed
 748  * if the callback returns 1
 749  */
 750 void iwl_tx_cmd_complete(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb)
 751 {
 752         struct iwl_rx_packet *pkt = rxb_addr(rxb);
 753         u16 sequence = le16_to_cpu(pkt->hdr.sequence);
 754         int txq_id = SEQ_TO_QUEUE(sequence);
 755         int index = SEQ_TO_INDEX(sequence);
 756         int cmd_index;
 757         struct iwl_device_cmd *cmd;
 758         struct iwl_cmd_meta *meta;
 759         struct iwl_tx_queue *txq = &priv->txq[priv->shrd->cmd_queue];
 760         unsigned long flags;
 761
 762         /* If a Tx command is being handled and it isn't in the actual
 763          * command queue then there a command routing bug has been introduced
 764          * in the queue management code. */
 765         if (WARN(txq_id != priv->shrd->cmd_queue,
 766                  "wrong command queue %d (should be %d), sequence 0x%X readp=%d writep=%d\n",
 767                   txq_id, priv->shrd->cmd_queue, sequence,
 768                   priv->txq[priv->shrd->cmd_queue].q.read_ptr,
 769                   priv->txq[priv->shrd->cmd_queue].q.write_ptr)) {
 770                 iwl_print_hex_error(priv, pkt, 32);
 771                 return;
 772         }
 773
 774         cmd_index = get_cmd_index(&txq->q, index);
 775         cmd = txq->cmd[cmd_index];
 776         meta = &txq->meta[cmd_index];
 777
 778         iwlagn_unmap_tfd(priv, meta, &txq->tfds[index], DMA_BIDIRECTIONAL);
 779
 780         /* Input error checking is done when commands are added to queue. */
 781         if (meta->flags & CMD_WANT_SKB) {
 782                 meta->source->reply_page = (unsigned long)rxb_addr(rxb);
 783                 rxb->page = NULL;
 784         } else if (meta->callback)
 785                 meta->callback(priv, cmd, pkt);
 786
 787         spin_lock_irqsave(&priv->hcmd_lock, flags);
 788
 789         iwl_hcmd_queue_reclaim(priv, txq_id, index);
 790
 791         if (!(meta->flags & CMD_ASYNC)) {
 792                 clear_bit(STATUS_HCMD_ACTIVE, &priv->shrd->status);
 793                 IWL_DEBUG_INFO(priv, "Clearing HCMD_ACTIVE for command %s\n",
 794                                get_cmd_string(cmd->hdr.cmd));
 795                 wake_up_interruptible(&priv->wait_command_queue);
 796         }
 797
 798         meta->flags = 0;
 799
 800         spin_unlock_irqrestore(&priv->hcmd_lock, flags);
 801 }
 802
 803 const char *get_cmd_string(u8 cmd)
 804 {
 805         switch (cmd) {
 806                 IWL_CMD(REPLY_ALIVE);
 807                 IWL_CMD(REPLY_ERROR);
 808                 IWL_CMD(REPLY_RXON);
 809                 IWL_CMD(REPLY_RXON_ASSOC);
 810                 IWL_CMD(REPLY_QOS_PARAM);
 811                 IWL_CMD(REPLY_RXON_TIMING);
 812                 IWL_CMD(REPLY_ADD_STA);
 813                 IWL_CMD(REPLY_REMOVE_STA);
 814                 IWL_CMD(REPLY_REMOVE_ALL_STA);
 815                 IWL_CMD(REPLY_TXFIFO_FLUSH);
 816                 IWL_CMD(REPLY_WEPKEY);
 817                 IWL_CMD(REPLY_TX);
 818                 IWL_CMD(REPLY_LEDS_CMD);
 819                 IWL_CMD(REPLY_TX_LINK_QUALITY_CMD);
 820                 IWL_CMD(COEX_PRIORITY_TABLE_CMD);
 821                 IWL_CMD(COEX_MEDIUM_NOTIFICATION);
 822                 IWL_CMD(COEX_EVENT_CMD);
 823                 IWL_CMD(REPLY_QUIET_CMD);
 824                 IWL_CMD(REPLY_CHANNEL_SWITCH);
 825                 IWL_CMD(CHANNEL_SWITCH_NOTIFICATION);
 826                 IWL_CMD(REPLY_SPECTRUM_MEASUREMENT_CMD);
 827                 IWL_CMD(SPECTRUM_MEASURE_NOTIFICATION);
 828                 IWL_CMD(POWER_TABLE_CMD);
 829                 IWL_CMD(PM_SLEEP_NOTIFICATION);
 830                 IWL_CMD(PM_DEBUG_STATISTIC_NOTIFIC);
 831                 IWL_CMD(REPLY_SCAN_CMD);
 832                 IWL_CMD(REPLY_SCAN_ABORT_CMD);
 833                 IWL_CMD(SCAN_START_NOTIFICATION);
 834                 IWL_CMD(SCAN_RESULTS_NOTIFICATION);
 835                 IWL_CMD(SCAN_COMPLETE_NOTIFICATION);
 836                 IWL_CMD(BEACON_NOTIFICATION);
 837                 IWL_CMD(REPLY_TX_BEACON);
 838                 IWL_CMD(WHO_IS_AWAKE_NOTIFICATION);
 839                 IWL_CMD(QUIET_NOTIFICATION);
 840                 IWL_CMD(REPLY_TX_PWR_TABLE_CMD);
 841                 IWL_CMD(MEASURE_ABORT_NOTIFICATION);
 842                 IWL_CMD(REPLY_BT_CONFIG);
 843                 IWL_CMD(REPLY_STATISTICS_CMD);
 844                 IWL_CMD(STATISTICS_NOTIFICATION);
 845                 IWL_CMD(REPLY_CARD_STATE_CMD);
 846                 IWL_CMD(CARD_STATE_NOTIFICATION);
 847                 IWL_CMD(MISSED_BEACONS_NOTIFICATION);
 848                 IWL_CMD(REPLY_CT_KILL_CONFIG_CMD);
 849                 IWL_CMD(SENSITIVITY_CMD);
 850                 IWL_CMD(REPLY_PHY_CALIBRATION_CMD);
 851                 IWL_CMD(REPLY_RX_PHY_CMD);
 852                 IWL_CMD(REPLY_RX_MPDU_CMD);
 853                 IWL_CMD(REPLY_RX);
 854                 IWL_CMD(REPLY_COMPRESSED_BA);
 855                 IWL_CMD(CALIBRATION_CFG_CMD);
 856                 IWL_CMD(CALIBRATION_RES_NOTIFICATION);
 857                 IWL_CMD(CALIBRATION_COMPLETE_NOTIFICATION);
 858                 IWL_CMD(REPLY_TX_POWER_DBM_CMD);
 859                 IWL_CMD(TEMPERATURE_NOTIFICATION);
 860                 IWL_CMD(TX_ANT_CONFIGURATION_CMD);
 861                 IWL_CMD(REPLY_BT_COEX_PROFILE_NOTIF);
 862                 IWL_CMD(REPLY_BT_COEX_PRIO_TABLE);
 863                 IWL_CMD(REPLY_BT_COEX_PROT_ENV);
 864                 IWL_CMD(REPLY_WIPAN_PARAMS);
 865                 IWL_CMD(REPLY_WIPAN_RXON);
 866                 IWL_CMD(REPLY_WIPAN_RXON_TIMING);
 867                 IWL_CMD(REPLY_WIPAN_RXON_ASSOC);
 868                 IWL_CMD(REPLY_WIPAN_QOS_PARAM);
 869                 IWL_CMD(REPLY_WIPAN_WEPKEY);
 870                 IWL_CMD(REPLY_WIPAN_P2P_CHANNEL_SWITCH);
 871                 IWL_CMD(REPLY_WIPAN_NOA_NOTIFICATION);
 872                 IWL_CMD(REPLY_WIPAN_DEACTIVATION_COMPLETE);
 873                 IWL_CMD(REPLY_WOWLAN_PATTERNS);
 874                 IWL_CMD(REPLY_WOWLAN_WAKEUP_FILTER);
 875                 IWL_CMD(REPLY_WOWLAN_TSC_RSC_PARAMS);
 876                 IWL_CMD(REPLY_WOWLAN_TKIP_PARAMS);
 877                 IWL_CMD(REPLY_WOWLAN_KEK_KCK_MATERIAL);
 878                 IWL_CMD(REPLY_WOWLAN_GET_STATUS);
 879         default:
 880                 return "UNKNOWN";
 881
 882         }
 883 }
 884
 885 #define HOST_COMPLETE_TIMEOUT (2 * HZ)
 886
 887 static void iwl_generic_cmd_callback(struct iwl_priv *priv,
 888                                      struct iwl_device_cmd *cmd,
 889                                      struct iwl_rx_packet *pkt)
 890 {
 891         if (pkt->hdr.flags & IWL_CMD_FAILED_MSK) {
 892                 IWL_ERR(priv, "Bad return from %s (0x%08X)\n",
 893                         get_cmd_string(cmd->hdr.cmd), pkt->hdr.flags);
 894                 return;
 895         }
 896
 897 #ifdef CONFIG_IWLWIFI_DEBUG
 898         switch (cmd->hdr.cmd) {
 899         case REPLY_TX_LINK_QUALITY_CMD:
 900         case SENSITIVITY_CMD:
 901                 IWL_DEBUG_HC_DUMP(priv, "back from %s (0x%08X)\n",
 902                                 get_cmd_string(cmd->hdr.cmd), pkt->hdr.flags);
 903                 break;
 904         default:
 905                 IWL_DEBUG_HC(priv, "back from %s (0x%08X)\n",
 906                                 get_cmd_string(cmd->hdr.cmd), pkt->hdr.flags);
 907         }
 908 #endif
 909 }
 910
 911 static int iwl_send_cmd_async(struct iwl_priv *priv, struct iwl_host_cmd *cmd)
 912 {
 913         int ret;
 914
 915         /* An asynchronous command can not expect an SKB to be set. */
 916         if (WARN_ON(cmd->flags & CMD_WANT_SKB))
 917                 return -EINVAL;
 918
 919         /* Assign a generic callback if one is not provided */
 920         if (!cmd->callback)
 921                 cmd->callback = iwl_generic_cmd_callback;
 922
 923         if (test_bit(STATUS_EXIT_PENDING, &priv->shrd->status))
 924                 return -EBUSY;
 925
 926         ret = iwl_enqueue_hcmd(priv, cmd);
 927         if (ret < 0) {
 928                 IWL_ERR(priv, "Error sending %s: enqueue_hcmd failed: %d\n",
 929                           get_cmd_string(cmd->id), ret);
 930                 return ret;
 931         }
 932         return 0;
 933 }
 934
 935 static int iwl_send_cmd_sync(struct iwl_priv *priv, struct iwl_host_cmd *cmd)
 936 {
 937         int cmd_idx;
 938         int ret;
 939
 940         lockdep_assert_held(&priv->shrd->mutex);
 941
 942          /* A synchronous command can not have a callback set. */
 943         if (WARN_ON(cmd->callback))
 944                 return -EINVAL;
 945
 946         IWL_DEBUG_INFO(priv, "Attempting to send sync command %s\n",
 947                         get_cmd_string(cmd->id));
 948
 949         set_bit(STATUS_HCMD_ACTIVE, &priv->shrd->status);
 950         IWL_DEBUG_INFO(priv, "Setting HCMD_ACTIVE for command %s\n",
 951                         get_cmd_string(cmd->id));
 952
 953         cmd_idx = iwl_enqueue_hcmd(priv, cmd);
 954         if (cmd_idx < 0) {
 955                 ret = cmd_idx;
 956                 clear_bit(STATUS_HCMD_ACTIVE, &priv->shrd->status);
 957                 IWL_ERR(priv, "Error sending %s: enqueue_hcmd failed: %d\n",
 958                           get_cmd_string(cmd->id), ret);
 959                 return ret;
 960         }
 961
 962         ret = wait_event_interruptible_timeout(priv->wait_command_queue,
 963                         !test_bit(STATUS_HCMD_ACTIVE, &priv->shrd->status),
 964                         HOST_COMPLETE_TIMEOUT);
 965         if (!ret) {
 966                 if (test_bit(STATUS_HCMD_ACTIVE, &priv->shrd->status)) {
 967                         IWL_ERR(priv,
 968                                 "Error sending %s: time out after %dms.\n",
 969                                 get_cmd_string(cmd->id),
 970                                 jiffies_to_msecs(HOST_COMPLETE_TIMEOUT));
 971
 972                         clear_bit(STATUS_HCMD_ACTIVE, &priv->shrd->status);
 973                         IWL_DEBUG_INFO(priv, "Clearing HCMD_ACTIVE for command"
 974                                  "%s\n", get_cmd_string(cmd->id));
 975                         ret = -ETIMEDOUT;
 976                         goto cancel;
 977                 }
 978         }
 979
 980         if (test_bit(STATUS_RF_KILL_HW, &priv->shrd->status)) {
 981                 IWL_ERR(priv, "Command %s aborted: RF KILL Switch\n",
 982                                get_cmd_string(cmd->id));
 983                 ret = -ECANCELED;
 984                 goto fail;
 985         }
 986         if (test_bit(STATUS_FW_ERROR, &priv->shrd->status)) {
 987                 IWL_ERR(priv, "Command %s failed: FW Error\n",
 988                                get_cmd_string(cmd->id));
 989                 ret = -EIO;
 990                 goto fail;
 991         }
 992         if ((cmd->flags & CMD_WANT_SKB) && !cmd->reply_page) {
 993                 IWL_ERR(priv, "Error: Response NULL in '%s'\n",
 994                           get_cmd_string(cmd->id));
 995                 ret = -EIO;
 996                 goto cancel;
 997         }
 998
 999         return 0;
1000
1001 cancel:
1002         if (cmd->flags & CMD_WANT_SKB) {
1003                 /*
1004                  * Cancel the CMD_WANT_SKB flag for the cmd in the
1005                  * TX cmd queue. Otherwise in case the cmd comes
1006                  * in later, it will possibly set an invalid
1007                  * address (cmd->meta.source).
1008                  */
1009                 priv->txq[priv->shrd->cmd_queue].meta[cmd_idx].flags &=
1010                                                         ~CMD_WANT_SKB;
1011         }
1012 fail:
1013         if (cmd->reply_page) {
1014                 iwl_free_pages(priv, cmd->reply_page);
1015                 cmd->reply_page = 0;
1016         }
1017
1018         return ret;
1019 }
1020
1021 int iwl_trans_pcie_send_cmd(struct iwl_priv *priv, struct iwl_host_cmd *cmd)
1022 {
1023         if (cmd->flags & CMD_ASYNC)
1024                 return iwl_send_cmd_async(priv, cmd);
1025
1026         return iwl_send_cmd_sync(priv, cmd);
1027 }
1028
1029 int iwl_trans_pcie_send_cmd_pdu(struct iwl_priv *priv, u8 id, u32 flags,
1030                 u16 len, const void *data)
1031 {
1032         struct iwl_host_cmd cmd = {
1033                 .id = id,
1034                 .len = { len, },
1035                 .data = { data, },
1036                 .flags = flags,
1037         };
1038
1039         return iwl_trans_pcie_send_cmd(priv, &cmd);
1040 }
1041
1042 /* Frees buffers until index _not_ inclusive */
1043 void iwl_tx_queue_reclaim(struct iwl_trans *trans, int txq_id, int index,
1044                             struct sk_buff_head *skbs)
1045
1046 {
1047         struct iwl_tx_queue *txq = &priv(trans)->txq[txq_id];
1048         struct iwl_queue *q = &txq->q;
1049         struct iwl_tx_info *tx_info;
1050         struct ieee80211_tx_info *info;
1051         int last_to_free;
1052
1053         /*Since we free until index _not_ inclusive, the one before index is
1054          * the last we will free. This one must be used */
1055         last_to_free = iwl_queue_dec_wrap(index, q->n_bd);
1056
1057         if ((index >= q->n_bd) ||
1058            (iwl_queue_used(q, last_to_free) == 0)) {
1059                 IWL_ERR(trans, "%s: Read index for DMA queue txq id (%d), "
1060                           "last_to_free %d is out of range [0-%d] %d %d.\n",
1061                           __func__, txq_id, last_to_free, q->n_bd,
1062                           q->write_ptr, q->read_ptr);
1063                 return;
1064         }
1065
1066         IWL_DEBUG_TX_REPLY(trans, "reclaim: [%d, %d, %d]\n", txq_id,
1067                            q->read_ptr, index);
1068
1069         if (WARN_ON(!skb_queue_empty(skbs)))
1070                 return;
1071
1072         for (;
1073              q->read_ptr != index;
1074              q->read_ptr = iwl_queue_inc_wrap(q->read_ptr, q->n_bd)) {
1075
1076                 tx_info = &txq->txb[txq->q.read_ptr];
1077
1078                 if (WARN_ON_ONCE(tx_info->skb == NULL))
1079                         continue;
1080
1081                 info = IEEE80211_SKB_CB(tx_info->skb);
1082                 info->driver_data[0] = tx_info->ctx;
1083
1084                 __skb_queue_tail(skbs, tx_info->skb);
1085
1086                 tx_info->skb = NULL;
1087
1088                 iwlagn_txq_inval_byte_cnt_tbl(priv(trans), txq);
1089
1090                 iwlagn_txq_free_tfd(priv(trans), txq, txq->q.read_ptr);
1091         }
1092 }