/****************************************************************************** * * Copyright(c) 2003 - 2008 Intel Corporation. All rights reserved. * * Portions of this file are derived from the ipw3945 project, as well * as portions of the ieee80211 subsystem header files. * * This program is free software; you can redistribute it and/or modify it * under the terms of version 2 of the GNU General Public License as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for * more details. * * You should have received a copy of the GNU General Public License along with * this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA * * The full GNU General Public License is included in this distribution in the * file called LICENSE. * * Contact Information: * James P. Ketrenos * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 * *****************************************************************************/ #include #include #include "iwl-eeprom.h" #include "iwl-dev.h" #include "iwl-core.h" #include "iwl-sta.h" #include "iwl-io.h" #include "iwl-helpers.h" static const u16 default_tid_to_tx_fifo[] = { IWL_TX_FIFO_AC1, IWL_TX_FIFO_AC0, IWL_TX_FIFO_AC0, IWL_TX_FIFO_AC1, IWL_TX_FIFO_AC2, IWL_TX_FIFO_AC2, IWL_TX_FIFO_AC3, IWL_TX_FIFO_AC3, IWL_TX_FIFO_NONE, IWL_TX_FIFO_NONE, IWL_TX_FIFO_NONE, IWL_TX_FIFO_NONE, IWL_TX_FIFO_NONE, IWL_TX_FIFO_NONE, IWL_TX_FIFO_NONE, IWL_TX_FIFO_NONE, IWL_TX_FIFO_AC3 }; /** * iwl_hw_txq_free_tfd - Free all chunks referenced by TFD [txq->q.read_ptr] * * Does NOT advance any TFD circular buffer read/write indexes * Does NOT free the TFD itself (which is within circular buffer) */ int iwl_hw_txq_free_tfd(struct iwl_priv *priv, struct iwl_tx_queue *txq) { struct iwl_tfd_frame *bd_tmp = (struct iwl_tfd_frame *)&txq->bd[0]; struct iwl_tfd_frame *bd = &bd_tmp[txq->q.read_ptr]; struct pci_dev *dev = priv->pci_dev; int i; int counter = 0; int index, is_odd; /* Host command buffers stay mapped in memory, nothing to clean */ if (txq->q.id == IWL_CMD_QUEUE_NUM) return 0; /* Sanity check on number of chunks */ counter = IWL_GET_BITS(*bd, num_tbs); if (counter > MAX_NUM_OF_TBS) { IWL_ERROR("Too many chunks: %i\n", counter); /* @todo issue fatal error, it is quite serious situation */ return 0; } /* Unmap chunks, if any. * TFD info for odd chunks is different format than for even chunks. */ for (i = 0; i < counter; i++) { index = i / 2; is_odd = i & 0x1; if (is_odd) pci_unmap_single( dev, IWL_GET_BITS(bd->pa[index], tb2_addr_lo16) | (IWL_GET_BITS(bd->pa[index], tb2_addr_hi20) << 16), IWL_GET_BITS(bd->pa[index], tb2_len), PCI_DMA_TODEVICE); else if (i > 0) pci_unmap_single(dev, le32_to_cpu(bd->pa[index].tb1_addr), IWL_GET_BITS(bd->pa[index], tb1_len), PCI_DMA_TODEVICE); /* Free SKB, if any, for this chunk */ if (txq->txb[txq->q.read_ptr].skb[i]) { struct sk_buff *skb = txq->txb[txq->q.read_ptr].skb[i]; dev_kfree_skb(skb); txq->txb[txq->q.read_ptr].skb[i] = NULL; } } return 0; } EXPORT_SYMBOL(iwl_hw_txq_free_tfd); int iwl_hw_txq_attach_buf_to_tfd(struct iwl_priv *priv, void *ptr, dma_addr_t addr, u16 len) { int index, is_odd; struct iwl_tfd_frame *tfd = ptr; u32 num_tbs = IWL_GET_BITS(*tfd, num_tbs); /* Each TFD can point to a maximum 20 Tx buffers */ if ((num_tbs >= MAX_NUM_OF_TBS) || (num_tbs < 0)) { IWL_ERROR("Error can not send more than %d chunks\n", MAX_NUM_OF_TBS); return -EINVAL; } index = num_tbs / 2; is_odd = num_tbs & 0x1; if (!is_odd) { tfd->pa[index].tb1_addr = cpu_to_le32(addr); IWL_SET_BITS(tfd->pa[index], tb1_addr_hi, iwl_get_dma_hi_address(addr)); IWL_SET_BITS(tfd->pa[index], tb1_len, len); } else { IWL_SET_BITS(tfd->pa[index], tb2_addr_lo16, (u32) (addr & 0xffff)); IWL_SET_BITS(tfd->pa[index], tb2_addr_hi20, addr >> 16); IWL_SET_BITS(tfd->pa[index], tb2_len, len); } IWL_SET_BITS(*tfd, num_tbs, num_tbs + 1); return 0; } EXPORT_SYMBOL(iwl_hw_txq_attach_buf_to_tfd); /** * iwl_txq_update_write_ptr - Send new write index to hardware */ int iwl_txq_update_write_ptr(struct iwl_priv *priv, struct iwl_tx_queue *txq) { u32 reg = 0; int ret = 0; int txq_id = txq->q.id; if (txq->need_update == 0) return ret; /* if we're trying to save power */ if (test_bit(STATUS_POWER_PMI, &priv->status)) { /* wake up nic if it's powered down ... * uCode will wake up, and interrupt us again, so next * time we'll skip this part. */ reg = iwl_read32(priv, CSR_UCODE_DRV_GP1); if (reg & CSR_UCODE_DRV_GP1_BIT_MAC_SLEEP) { IWL_DEBUG_INFO("Requesting wakeup, GP1 = 0x%x\n", reg); iwl_set_bit(priv, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ); return ret; } /* restore this queue's parameters in nic hardware. */ ret = iwl_grab_nic_access(priv); if (ret) return ret; iwl_write_direct32(priv, HBUS_TARG_WRPTR, txq->q.write_ptr | (txq_id << 8)); iwl_release_nic_access(priv); /* else not in power-save mode, uCode will never sleep when we're * trying to tx (during RFKILL, we're not trying to tx). */ } else iwl_write32(priv, HBUS_TARG_WRPTR, txq->q.write_ptr | (txq_id << 8)); txq->need_update = 0; return ret; } EXPORT_SYMBOL(iwl_txq_update_write_ptr); /** * iwl_tx_queue_free - Deallocate DMA queue. * @txq: Transmit queue to deallocate. * * Empty queue by removing and destroying all BD's. * Free all buffers. * 0-fill, but do not free "txq" descriptor structure. */ static void iwl_tx_queue_free(struct iwl_priv *priv, struct iwl_tx_queue *txq) { struct iwl_queue *q = &txq->q; struct pci_dev *dev = priv->pci_dev; int len; if (q->n_bd == 0) return; /* first, empty all BD's */ for (; q->write_ptr != q->read_ptr; q->read_ptr = iwl_queue_inc_wrap(q->read_ptr, q->n_bd)) iwl_hw_txq_free_tfd(priv, txq); len = sizeof(struct iwl_cmd) * q->n_window; if (q->id == IWL_CMD_QUEUE_NUM) len += IWL_MAX_SCAN_SIZE; /* De-alloc array of command/tx buffers */ pci_free_consistent(dev, len, txq->cmd, txq->dma_addr_cmd); /* De-alloc circular buffer of TFDs */ if (txq->q.n_bd) pci_free_consistent(dev, sizeof(struct iwl_tfd_frame) * txq->q.n_bd, txq->bd, txq->q.dma_addr); /* De-alloc array of per-TFD driver data */ kfree(txq->txb); txq->txb = NULL; /* 0-fill queue descriptor structure */ memset(txq, 0, sizeof(*txq)); } /*************** DMA-QUEUE-GENERAL-FUNCTIONS ***** * DMA services * * Theory of operation * * A Tx or Rx queue resides in host DRAM, and is comprised of a circular buffer * of buffer descriptors, each of which points to one or more data buffers for * the device to read from or fill. Driver and device exchange status of each * queue via "read" and "write" pointers. Driver keeps minimum of 2 empty * entries in each circular buffer, to protect against confusing empty and full * queue states. * * The device reads or writes the data in the queues via the device's several * DMA/FIFO channels. Each queue is mapped to a single DMA channel. * * For Tx queue, there are low mark and high mark limits. If, after queuing * the packet for Tx, free space become < low mark, Tx queue stopped. When * reclaiming packets (on 'tx done IRQ), if free space become > high mark, * Tx queue resumed. * * See more detailed info in iwl-4965-hw.h. ***************************************************/ int iwl_queue_space(const struct iwl_queue *q) { int s = q->read_ptr - q->write_ptr; if (q->read_ptr > q->write_ptr) s -= q->n_bd; if (s <= 0) s += q->n_window; /* keep some reserve to not confuse empty and full situations */ s -= 2; if (s < 0) s = 0; return s; } EXPORT_SYMBOL(iwl_queue_space); /** * iwl_queue_init - Initialize queue's high/low-water and read/write indexes */ static int iwl_queue_init(struct iwl_priv *priv, struct iwl_queue *q, int count, int slots_num, u32 id) { q->n_bd = count; q->n_window = slots_num; q->id = id; /* count must be power-of-two size, otherwise iwl_queue_inc_wrap * and iwl_queue_dec_wrap are broken. */ BUG_ON(!is_power_of_2(count)); /* slots_num must be power-of-two size, otherwise * get_cmd_index is broken. */ BUG_ON(!is_power_of_2(slots_num)); q->low_mark = q->n_window / 4; if (q->low_mark < 4) q->low_mark = 4; q->high_mark = q->n_window / 8; if (q->high_mark < 2) q->high_mark = 2; q->write_ptr = q->read_ptr = 0; return 0; } /** * iwl_tx_queue_alloc - Alloc driver data and TFD CB for one Tx/cmd queue */ static int iwl_tx_queue_alloc(struct iwl_priv *priv, struct iwl_tx_queue *txq, u32 id) { struct pci_dev *dev = priv->pci_dev; /* Driver private data, only for Tx (not command) queues, * not shared with device. */ if (id != IWL_CMD_QUEUE_NUM) { txq->txb = kmalloc(sizeof(txq->txb[0]) * TFD_QUEUE_SIZE_MAX, GFP_KERNEL); if (!txq->txb) { IWL_ERROR("kmalloc for auxiliary BD " "structures failed\n"); goto error; } } else txq->txb = NULL; /* Circular buffer of transmit frame descriptors (TFDs), * shared with device */ txq->bd = pci_alloc_consistent(dev, sizeof(txq->bd[0]) * TFD_QUEUE_SIZE_MAX, &txq->q.dma_addr); if (!txq->bd) { IWL_ERROR("pci_alloc_consistent(%zd) failed\n", sizeof(txq->bd[0]) * TFD_QUEUE_SIZE_MAX); goto error; } txq->q.id = id; return 0; error: kfree(txq->txb); txq->txb = NULL; return -ENOMEM; } /* * Tell nic where to find circular buffer of Tx Frame Descriptors for * given Tx queue, and enable the DMA channel used for that queue. * * 4965 supports up to 16 Tx queues in DRAM, mapped to up to 8 Tx DMA * channels supported in hardware. */ static int iwl_hw_tx_queue_init(struct iwl_priv *priv, struct iwl_tx_queue *txq) { int rc; unsigned long flags; int txq_id = txq->q.id; spin_lock_irqsave(&priv->lock, flags); rc = iwl_grab_nic_access(priv); if (rc) { spin_unlock_irqrestore(&priv->lock, flags); return rc; } /* Circular buffer (TFD queue in DRAM) physical base address */ iwl_write_direct32(priv, FH_MEM_CBBC_QUEUE(txq_id), txq->q.dma_addr >> 8); /* Enable DMA channel, using same id as for TFD queue */ iwl_write_direct32( priv, FH_TCSR_CHNL_TX_CONFIG_REG(txq_id), FH_TCSR_TX_CONFIG_REG_VAL_DMA_CHNL_ENABLE | FH_TCSR_TX_CONFIG_REG_VAL_DMA_CREDIT_ENABLE_VAL); iwl_release_nic_access(priv); spin_unlock_irqrestore(&priv->lock, flags); return 0; } /** * iwl_tx_queue_init - Allocate and initialize one tx/cmd queue */ static int iwl_tx_queue_init(struct iwl_priv *priv, struct iwl_tx_queue *txq, int slots_num, u32 txq_id) { struct pci_dev *dev = priv->pci_dev; int len; int rc = 0; /* * Alloc buffer array for commands (Tx or other types of commands). * For the command queue (#4), allocate command space + one big * command for scan, since scan command is very huge; the system will * not have two scans at the same time, so only one is needed. * For normal Tx queues (all other queues), no super-size command * space is needed. */ len = sizeof(struct iwl_cmd) * slots_num; if (txq_id == IWL_CMD_QUEUE_NUM) len += IWL_MAX_SCAN_SIZE; txq->cmd = pci_alloc_consistent(dev, len, &txq->dma_addr_cmd); if (!txq->cmd) return -ENOMEM; /* Alloc driver data array and TFD circular buffer */ rc = iwl_tx_queue_alloc(priv, txq, txq_id); if (rc) { pci_free_consistent(dev, len, txq->cmd, txq->dma_addr_cmd); return -ENOMEM; } txq->need_update = 0; /* TFD_QUEUE_SIZE_MAX must be power-of-two size, otherwise * iwl_queue_inc_wrap and iwl_queue_dec_wrap are broken. */ BUILD_BUG_ON(TFD_QUEUE_SIZE_MAX & (TFD_QUEUE_SIZE_MAX - 1)); /* Initialize queue's high/low-water marks, and head/tail indexes */ iwl_queue_init(priv, &txq->q, TFD_QUEUE_SIZE_MAX, slots_num, txq_id); /* Tell device where to find queue */ iwl_hw_tx_queue_init(priv, txq); return 0; } /** * iwl_hw_txq_ctx_free - Free TXQ Context * * Destroy all TX DMA queues and structures */ void iwl_hw_txq_ctx_free(struct iwl_priv *priv) { int txq_id; /* Tx queues */ for (txq_id = 0; txq_id < priv->hw_params.max_txq_num; txq_id++) iwl_tx_queue_free(priv, &priv->txq[txq_id]); /* Keep-warm buffer */ iwl_kw_free(priv); } EXPORT_SYMBOL(iwl_hw_txq_ctx_free); /** * iwl_txq_ctx_reset - Reset TX queue context * Destroys all DMA structures and initialise them again * * @param priv * @return error code */ int iwl_txq_ctx_reset(struct iwl_priv *priv) { int ret = 0; int txq_id, slots_num; unsigned long flags; iwl_kw_free(priv); /* Free all tx/cmd queues and keep-warm buffer */ iwl_hw_txq_ctx_free(priv); /* Alloc keep-warm buffer */ ret = iwl_kw_alloc(priv); if (ret) { IWL_ERROR("Keep Warm allocation failed"); goto error_kw; } spin_lock_irqsave(&priv->lock, flags); ret = iwl_grab_nic_access(priv); if (unlikely(ret)) { spin_unlock_irqrestore(&priv->lock, flags); goto error_reset; } /* Turn off all Tx DMA fifos */ priv->cfg->ops->lib->txq_set_sched(priv, 0); iwl_release_nic_access(priv); spin_unlock_irqrestore(&priv->lock, flags); /* Tell nic where to find the keep-warm buffer */ ret = iwl_kw_init(priv); if (ret) { IWL_ERROR("kw_init failed\n"); goto error_reset; } /* Alloc and init all Tx queues, including the command queue (#4) */ for (txq_id = 0; txq_id < priv->hw_params.max_txq_num; txq_id++) { slots_num = (txq_id == IWL_CMD_QUEUE_NUM) ? TFD_CMD_SLOTS : TFD_TX_CMD_SLOTS; ret = iwl_tx_queue_init(priv, &priv->txq[txq_id], slots_num, txq_id); if (ret) { IWL_ERROR("Tx %d queue init failed\n", txq_id); goto error; } } return ret; error: iwl_hw_txq_ctx_free(priv); error_reset: iwl_kw_free(priv); error_kw: return ret; } /** * iwl_txq_ctx_stop - Stop all Tx DMA channels, free Tx queue memory */ void iwl_txq_ctx_stop(struct iwl_priv *priv) { int txq_id; unsigned long flags; /* Turn off all Tx DMA fifos */ spin_lock_irqsave(&priv->lock, flags); if (iwl_grab_nic_access(priv)) { spin_unlock_irqrestore(&priv->lock, flags); return; } priv->cfg->ops->lib->txq_set_sched(priv, 0); /* Stop each Tx DMA channel, and wait for it to be idle */ for (txq_id = 0; txq_id < priv->hw_params.max_txq_num; txq_id++) { iwl_write_direct32(priv, FH_TCSR_CHNL_TX_CONFIG_REG(txq_id), 0x0); iwl_poll_direct_bit(priv, FH_TSSR_TX_STATUS_REG, FH_TSSR_TX_STATUS_REG_MSK_CHNL_IDLE (txq_id), 200); } iwl_release_nic_access(priv); spin_unlock_irqrestore(&priv->lock, flags); /* Deallocate memory for all Tx queues */ iwl_hw_txq_ctx_free(priv); } EXPORT_SYMBOL(iwl_txq_ctx_stop); /* * handle build REPLY_TX command notification. */ static void iwl_tx_cmd_build_basic(struct iwl_priv *priv, struct iwl_tx_cmd *tx_cmd, struct ieee80211_tx_info *info, struct ieee80211_hdr *hdr, int is_unicast, u8 std_id) { u16 fc = le16_to_cpu(hdr->frame_control); __le32 tx_flags = tx_cmd->tx_flags; tx_cmd->stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE; if (!(info->flags & IEEE80211_TX_CTL_NO_ACK)) { tx_flags |= TX_CMD_FLG_ACK_MSK; if ((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT) tx_flags |= TX_CMD_FLG_SEQ_CTL_MSK; if (ieee80211_is_probe_response(fc) && !(le16_to_cpu(hdr->seq_ctrl) & 0xf)) tx_flags |= TX_CMD_FLG_TSF_MSK; } else { tx_flags &= (~TX_CMD_FLG_ACK_MSK); tx_flags |= TX_CMD_FLG_SEQ_CTL_MSK; } if (ieee80211_is_back_request(fc)) tx_flags |= TX_CMD_FLG_ACK_MSK | TX_CMD_FLG_IMM_BA_RSP_MASK; tx_cmd->sta_id = std_id; if (ieee80211_get_morefrag(hdr)) tx_flags |= TX_CMD_FLG_MORE_FRAG_MSK; if (ieee80211_is_qos_data(fc)) { u8 *qc = ieee80211_get_qos_ctrl(hdr, ieee80211_get_hdrlen(fc)); tx_cmd->tid_tspec = qc[0] & 0xf; tx_flags &= ~TX_CMD_FLG_SEQ_CTL_MSK; } else { tx_flags |= TX_CMD_FLG_SEQ_CTL_MSK; } if (info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) { tx_flags |= TX_CMD_FLG_RTS_MSK; tx_flags &= ~TX_CMD_FLG_CTS_MSK; } else if (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT) { tx_flags &= ~TX_CMD_FLG_RTS_MSK; tx_flags |= TX_CMD_FLG_CTS_MSK; } if ((tx_flags & TX_CMD_FLG_RTS_MSK) || (tx_flags & TX_CMD_FLG_CTS_MSK)) tx_flags |= TX_CMD_FLG_FULL_TXOP_PROT_MSK; tx_flags &= ~(TX_CMD_FLG_ANT_SEL_MSK); if ((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT) { if ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_ASSOC_REQ || (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_REASSOC_REQ) tx_cmd->timeout.pm_frame_timeout = cpu_to_le16(3); else tx_cmd->timeout.pm_frame_timeout = cpu_to_le16(2); } else { tx_cmd->timeout.pm_frame_timeout = 0; } tx_cmd->driver_txop = 0; tx_cmd->tx_flags = tx_flags; tx_cmd->next_frame_len = 0; } #define RTS_HCCA_RETRY_LIMIT 3 #define RTS_DFAULT_RETRY_LIMIT 60 static void iwl_tx_cmd_build_rate(struct iwl_priv *priv, struct iwl_tx_cmd *tx_cmd, struct ieee80211_tx_info *info, u16 fc, int sta_id, int is_hcca) { u8 rts_retry_limit = 0; u8 data_retry_limit = 0; u8 rate_plcp; u16 rate_flags = 0; int rate_idx; rate_idx = min(ieee80211_get_tx_rate(priv->hw, info)->hw_value & 0xffff, IWL_RATE_COUNT - 1); rate_plcp = iwl_rates[rate_idx].plcp; rts_retry_limit = (is_hcca) ? RTS_HCCA_RETRY_LIMIT : RTS_DFAULT_RETRY_LIMIT; if ((rate_idx >= IWL_FIRST_CCK_RATE) && (rate_idx <= IWL_LAST_CCK_RATE)) rate_flags |= RATE_MCS_CCK_MSK; if (ieee80211_is_probe_response(fc)) { data_retry_limit = 3; if (data_retry_limit < rts_retry_limit) rts_retry_limit = data_retry_limit; } else data_retry_limit = IWL_DEFAULT_TX_RETRY; if (priv->data_retry_limit != -1) data_retry_limit = priv->data_retry_limit; if (ieee80211_is_data(fc)) { tx_cmd->initial_rate_index = 0; tx_cmd->tx_flags |= TX_CMD_FLG_STA_RATE_MSK; } else { switch (fc & IEEE80211_FCTL_STYPE) { case IEEE80211_STYPE_AUTH: case IEEE80211_STYPE_DEAUTH: case IEEE80211_STYPE_ASSOC_REQ: case IEEE80211_STYPE_REASSOC_REQ: if (tx_cmd->tx_flags & TX_CMD_FLG_RTS_MSK) { tx_cmd->tx_flags &= ~TX_CMD_FLG_RTS_MSK; tx_cmd->tx_flags |= TX_CMD_FLG_CTS_MSK; } break; default: break; } /* Alternate between antenna A and B for successive frames */ if (priv->use_ant_b_for_management_frame) { priv->use_ant_b_for_management_frame = 0; rate_flags |= RATE_MCS_ANT_B_MSK; } else { priv->use_ant_b_for_management_frame = 1; rate_flags |= RATE_MCS_ANT_A_MSK; } } tx_cmd->rts_retry_limit = rts_retry_limit; tx_cmd->data_retry_limit = data_retry_limit; tx_cmd->rate_n_flags = iwl4965_hw_set_rate_n_flags(rate_plcp, rate_flags); } static void iwl_tx_cmd_build_hwcrypto(struct iwl_priv *priv, struct ieee80211_tx_info *info, struct iwl_tx_cmd *tx_cmd, struct sk_buff *skb_frag, int sta_id) { struct ieee80211_key_conf *keyconf = info->control.hw_key; switch (keyconf->alg) { case ALG_CCMP: tx_cmd->sec_ctl = TX_CMD_SEC_CCM; memcpy(tx_cmd->key, keyconf->key, keyconf->keylen); if (info->flags & IEEE80211_TX_CTL_AMPDU) tx_cmd->tx_flags |= TX_CMD_FLG_AGG_CCMP_MSK; IWL_DEBUG_TX("tx_cmd with aes hwcrypto\n"); break; case ALG_TKIP: tx_cmd->sec_ctl = TX_CMD_SEC_TKIP; ieee80211_get_tkip_key(keyconf, skb_frag, IEEE80211_TKIP_P2_KEY, tx_cmd->key); IWL_DEBUG_TX("tx_cmd with tkip hwcrypto\n"); break; case ALG_WEP: tx_cmd->sec_ctl |= (TX_CMD_SEC_WEP | (keyconf->keyidx & TX_CMD_SEC_MSK) << TX_CMD_SEC_SHIFT); if (keyconf->keylen == WEP_KEY_LEN_128) tx_cmd->sec_ctl |= TX_CMD_SEC_KEY128; memcpy(&tx_cmd->key[3], keyconf->key, keyconf->keylen); IWL_DEBUG_TX("Configuring packet for WEP encryption " "with key %d\n", keyconf->keyidx); break; default: printk(KERN_ERR "Unknown encode alg %d\n", keyconf->alg); break; } } static void iwl_update_tx_stats(struct iwl_priv *priv, u16 fc, u16 len) { /* 0 - mgmt, 1 - cnt, 2 - data */ int idx = (fc & IEEE80211_FCTL_FTYPE) >> 2; priv->tx_stats[idx].cnt++; priv->tx_stats[idx].bytes += len; } /* * start REPLY_TX command process */ int iwl_tx_skb(struct iwl_priv *priv, struct sk_buff *skb) { struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); struct iwl_tfd_frame *tfd; u32 *control_flags; int txq_id = skb_get_queue_mapping(skb); struct iwl_tx_queue *txq = NULL; struct iwl_queue *q = NULL; dma_addr_t phys_addr; dma_addr_t txcmd_phys; dma_addr_t scratch_phys; struct iwl_cmd *out_cmd = NULL; struct iwl_tx_cmd *tx_cmd; u16 len, idx, len_org; u16 seq_number = 0; u8 id, hdr_len, unicast; u8 sta_id; u16 fc; u8 wait_write_ptr = 0; u8 tid = 0; u8 *qc = NULL; unsigned long flags; int ret; spin_lock_irqsave(&priv->lock, flags); if (iwl_is_rfkill(priv)) { IWL_DEBUG_DROP("Dropping - RF KILL\n"); goto drop_unlock; } if (!priv->vif) { IWL_DEBUG_DROP("Dropping - !priv->vif\n"); goto drop_unlock; } if ((ieee80211_get_tx_rate(priv->hw, info)->hw_value & 0xFF) == IWL_INVALID_RATE) { IWL_ERROR("ERROR: No TX rate available.\n"); goto drop_unlock; } unicast = !is_multicast_ether_addr(hdr->addr1); id = 0; fc = le16_to_cpu(hdr->frame_control); #ifdef CONFIG_IWLWIFI_DEBUG if (ieee80211_is_auth(fc)) IWL_DEBUG_TX("Sending AUTH frame\n"); else if (ieee80211_is_assoc_request(fc)) IWL_DEBUG_TX("Sending ASSOC frame\n"); else if (ieee80211_is_reassoc_request(fc)) IWL_DEBUG_TX("Sending REASSOC frame\n"); #endif /* drop all data frame if we are not associated */ if (((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) && (!iwl_is_associated(priv) || ((priv->iw_mode == IEEE80211_IF_TYPE_STA) && !priv->assoc_id) || !priv->assoc_station_added)) { IWL_DEBUG_DROP("Dropping - !iwl_is_associated\n"); goto drop_unlock; } spin_unlock_irqrestore(&priv->lock, flags); hdr_len = ieee80211_get_hdrlen(fc); /* Find (or create) index into station table for destination station */ sta_id = iwl_get_sta_id(priv, hdr); if (sta_id == IWL_INVALID_STATION) { DECLARE_MAC_BUF(mac); IWL_DEBUG_DROP("Dropping - INVALID STATION: %s\n", print_mac(mac, hdr->addr1)); goto drop; } IWL_DEBUG_TX("station Id %d\n", sta_id); if (ieee80211_is_qos_data(fc)) { qc = ieee80211_get_qos_ctrl(hdr, hdr_len); tid = qc[0] & 0xf; seq_number = priv->stations[sta_id].tid[tid].seq_number & IEEE80211_SCTL_SEQ; hdr->seq_ctrl = cpu_to_le16(seq_number) | (hdr->seq_ctrl & __constant_cpu_to_le16(IEEE80211_SCTL_FRAG)); seq_number += 0x10; /* aggregation is on for this */ if (info->flags & IEEE80211_TX_CTL_AMPDU) txq_id = priv->stations[sta_id].tid[tid].agg.txq_id; priv->stations[sta_id].tid[tid].tfds_in_queue++; } /* Descriptor for chosen Tx queue */ txq = &priv->txq[txq_id]; q = &txq->q; spin_lock_irqsave(&priv->lock, flags); /* Set up first empty TFD within this queue's circular TFD buffer */ tfd = &txq->bd[q->write_ptr]; memset(tfd, 0, sizeof(*tfd)); control_flags = (u32 *) tfd; idx = get_cmd_index(q, q->write_ptr, 0); /* Set up driver data for this TFD */ memset(&(txq->txb[q->write_ptr]), 0, sizeof(struct iwl_tx_info)); txq->txb[q->write_ptr].skb[0] = skb; /* Set up first empty entry in queue's array of Tx/cmd buffers */ out_cmd = &txq->cmd[idx]; tx_cmd = &out_cmd->cmd.tx; memset(&out_cmd->hdr, 0, sizeof(out_cmd->hdr)); memset(tx_cmd, 0, sizeof(struct iwl_tx_cmd)); /* * Set up the Tx-command (not MAC!) header. * Store the chosen Tx queue and TFD index within the sequence field; * after Tx, uCode's Tx response will return this value so driver can * locate the frame within the tx queue and do post-tx processing. */ out_cmd->hdr.cmd = REPLY_TX; out_cmd->hdr.sequence = cpu_to_le16((u16)(QUEUE_TO_SEQ(txq_id) | INDEX_TO_SEQ(q->write_ptr))); /* Copy MAC header from skb into command buffer */ memcpy(tx_cmd->hdr, hdr, hdr_len); /* * Use the first empty entry in this queue's command buffer array * to contain the Tx command and MAC header concatenated together * (payload data will be in another buffer). * Size of this varies, due to varying MAC header length. * If end is not dword aligned, we'll have 2 extra bytes at the end * of the MAC header (device reads on dword boundaries). * We'll tell device about this padding later. */ len = sizeof(struct iwl_tx_cmd) + sizeof(struct iwl_cmd_header) + hdr_len; len_org = len; len = (len + 3) & ~3; if (len_org != len) len_org = 1; else len_org = 0; /* Physical address of this Tx command's header (not MAC header!), * within command buffer array. */ txcmd_phys = txq->dma_addr_cmd + sizeof(struct iwl_cmd) * idx + offsetof(struct iwl_cmd, hdr); /* Add buffer containing Tx command and MAC(!) header to TFD's * first entry */ iwl_hw_txq_attach_buf_to_tfd(priv, tfd, txcmd_phys, len); if (!(info->flags & IEEE80211_TX_CTL_DO_NOT_ENCRYPT)) iwl_tx_cmd_build_hwcrypto(priv, info, tx_cmd, skb, sta_id); /* Set up TFD's 2nd entry to point directly to remainder of skb, * if any (802.11 null frames have no payload). */ len = skb->len - hdr_len; if (len) { phys_addr = pci_map_single(priv->pci_dev, skb->data + hdr_len, len, PCI_DMA_TODEVICE); iwl_hw_txq_attach_buf_to_tfd(priv, tfd, phys_addr, len); } /* Tell NIC about any 2-byte padding after MAC header */ if (len_org) tx_cmd->tx_flags |= TX_CMD_FLG_MH_PAD_MSK; /* Total # bytes to be transmitted */ len = (u16)skb->len; tx_cmd->len = cpu_to_le16(len); /* TODO need this for burst mode later on */ iwl_tx_cmd_build_basic(priv, tx_cmd, info, hdr, unicast, sta_id); /* set is_hcca to 0; it probably will never be implemented */ iwl_tx_cmd_build_rate(priv, tx_cmd, info, fc, sta_id, 0); iwl_update_tx_stats(priv, fc, len); scratch_phys = txcmd_phys + sizeof(struct iwl_cmd_header) + offsetof(struct iwl_tx_cmd, scratch); tx_cmd->dram_lsb_ptr = cpu_to_le32(scratch_phys); tx_cmd->dram_msb_ptr = iwl_get_dma_hi_address(scratch_phys); if (!ieee80211_get_morefrag(hdr)) { txq->need_update = 1; if (qc) priv->stations[sta_id].tid[tid].seq_number = seq_number; } else { wait_write_ptr = 1; txq->need_update = 0; } iwl_print_hex_dump(priv, IWL_DL_TX, (u8 *)tx_cmd, sizeof(*tx_cmd)); iwl_print_hex_dump(priv, IWL_DL_TX, (u8 *)tx_cmd->hdr, hdr_len); /* Set up entry for this TFD in Tx byte-count array */ priv->cfg->ops->lib->txq_update_byte_cnt_tbl(priv, txq, len); /* Tell device the write index *just past* this latest filled TFD */ q->write_ptr = iwl_queue_inc_wrap(q->write_ptr, q->n_bd); ret = iwl_txq_update_write_ptr(priv, txq); spin_unlock_irqrestore(&priv->lock, flags); if (ret) return ret; if ((iwl_queue_space(q) < q->high_mark) && priv->mac80211_registered) { if (wait_write_ptr) { spin_lock_irqsave(&priv->lock, flags); txq->need_update = 1; iwl_txq_update_write_ptr(priv, txq); spin_unlock_irqrestore(&priv->lock, flags); } ieee80211_stop_queue(priv->hw, skb_get_queue_mapping(skb)); } return 0; drop_unlock: spin_unlock_irqrestore(&priv->lock, flags); drop: return -1; } EXPORT_SYMBOL(iwl_tx_skb); /*************** HOST COMMAND QUEUE FUNCTIONS *****/ /** * iwl_enqueue_hcmd - enqueue a uCode command * @priv: device private data point * @cmd: a point to the ucode command structure * * The function returns < 0 values to indicate the operation is * failed. On success, it turns the index (> 0) of command in the * command queue. */ int iwl_enqueue_hcmd(struct iwl_priv *priv, struct iwl_host_cmd *cmd) { struct iwl_tx_queue *txq = &priv->txq[IWL_CMD_QUEUE_NUM]; struct iwl_queue *q = &txq->q; struct iwl_tfd_frame *tfd; u32 *control_flags; struct iwl_cmd *out_cmd; u32 idx; u16 fix_size; dma_addr_t phys_addr; int ret; unsigned long flags; cmd->len = priv->cfg->ops->utils->get_hcmd_size(cmd->id, cmd->len); fix_size = (u16)(cmd->len + sizeof(out_cmd->hdr)); /* If any of the command structures end up being larger than * the TFD_MAX_PAYLOAD_SIZE, and it sent as a 'small' command then * we will need to increase the size of the TFD entries */ BUG_ON((fix_size > TFD_MAX_PAYLOAD_SIZE) && !(cmd->meta.flags & CMD_SIZE_HUGE)); if (iwl_is_rfkill(priv)) { IWL_DEBUG_INFO("Not sending command - RF KILL"); return -EIO; } if (iwl_queue_space(q) < ((cmd->meta.flags & CMD_ASYNC) ? 2 : 1)) { IWL_ERROR("No space for Tx\n"); return -ENOSPC; } spin_lock_irqsave(&priv->hcmd_lock, flags); tfd = &txq->bd[q->write_ptr]; memset(tfd, 0, sizeof(*tfd)); control_flags = (u32 *) tfd; idx = get_cmd_index(q, q->write_ptr, cmd->meta.flags & CMD_SIZE_HUGE); out_cmd = &txq->cmd[idx]; out_cmd->hdr.cmd = cmd->id; memcpy(&out_cmd->meta, &cmd->meta, sizeof(cmd->meta)); memcpy(&out_cmd->cmd.payload, cmd->data, cmd->len); /* At this point, the out_cmd now has all of the incoming cmd * information */ out_cmd->hdr.flags = 0; out_cmd->hdr.sequence = cpu_to_le16(QUEUE_TO_SEQ(IWL_CMD_QUEUE_NUM) | INDEX_TO_SEQ(q->write_ptr)); if (out_cmd->meta.flags & CMD_SIZE_HUGE) out_cmd->hdr.sequence |= cpu_to_le16(SEQ_HUGE_FRAME); phys_addr = txq->dma_addr_cmd + sizeof(txq->cmd[0]) * idx + offsetof(struct iwl_cmd, hdr); iwl_hw_txq_attach_buf_to_tfd(priv, tfd, phys_addr, fix_size); IWL_DEBUG_HC("Sending command %s (#%x), seq: 0x%04X, " "%d bytes at %d[%d]:%d\n", get_cmd_string(out_cmd->hdr.cmd), out_cmd->hdr.cmd, le16_to_cpu(out_cmd->hdr.sequence), fix_size, q->write_ptr, idx, IWL_CMD_QUEUE_NUM); txq->need_update = 1; /* Set up entry in queue's byte count circular buffer */ priv->cfg->ops->lib->txq_update_byte_cnt_tbl(priv, txq, 0); /* Increment and update queue's write index */ q->write_ptr = iwl_queue_inc_wrap(q->write_ptr, q->n_bd); ret = iwl_txq_update_write_ptr(priv, txq); spin_unlock_irqrestore(&priv->hcmd_lock, flags); return ret ? ret : idx; } int iwl_tx_queue_reclaim(struct iwl_priv *priv, int txq_id, int index) { struct iwl_tx_queue *txq = &priv->txq[txq_id]; struct iwl_queue *q = &txq->q; struct iwl_tx_info *tx_info; int nfreed = 0; if ((index >= q->n_bd) || (iwl_queue_used(q, index) == 0)) { IWL_ERROR("Read index for DMA queue txq id (%d), index %d, " "is out of range [0-%d] %d %d.\n", txq_id, index, q->n_bd, q->write_ptr, q->read_ptr); return 0; } for (index = iwl_queue_inc_wrap(index, q->n_bd); q->read_ptr != index; q->read_ptr = iwl_queue_inc_wrap(q->read_ptr, q->n_bd)) { tx_info = &txq->txb[txq->q.read_ptr]; ieee80211_tx_status_irqsafe(priv->hw, tx_info->skb[0]); tx_info->skb[0] = NULL; if (priv->cfg->ops->lib->txq_inval_byte_cnt_tbl) priv->cfg->ops->lib->txq_inval_byte_cnt_tbl(priv, txq); iwl_hw_txq_free_tfd(priv, txq); nfreed++; } return nfreed; } EXPORT_SYMBOL(iwl_tx_queue_reclaim); /** * iwl_hcmd_queue_reclaim - Reclaim TX command queue entries already Tx'd * * When FW advances 'R' index, all entries between old and new 'R' index * need to be reclaimed. As result, some free space forms. If there is * enough free space (> low mark), wake the stack that feeds us. */ static void iwl_hcmd_queue_reclaim(struct iwl_priv *priv, int txq_id, int index) { struct iwl_tx_queue *txq = &priv->txq[txq_id]; struct iwl_queue *q = &txq->q; int nfreed = 0; if ((index >= q->n_bd) || (iwl_queue_used(q, index) == 0)) { IWL_ERROR("Read index for DMA queue txq id (%d), index %d, " "is out of range [0-%d] %d %d.\n", txq_id, index, q->n_bd, q->write_ptr, q->read_ptr); return; } for (index = iwl_queue_inc_wrap(index, q->n_bd); q->read_ptr != index; q->read_ptr = iwl_queue_inc_wrap(q->read_ptr, q->n_bd)) { if (nfreed > 1) { IWL_ERROR("HCMD skipped: index (%d) %d %d\n", index, q->write_ptr, q->read_ptr); queue_work(priv->workqueue, &priv->restart); } nfreed++; } } /** * iwl_tx_cmd_complete - Pull unused buffers off the queue and reclaim them * @rxb: Rx buffer to reclaim * * If an Rx buffer has an async callback associated with it the callback * will be executed. The attached skb (if present) will only be freed * if the callback returns 1 */ void iwl_tx_cmd_complete(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb) { struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data; u16 sequence = le16_to_cpu(pkt->hdr.sequence); int txq_id = SEQ_TO_QUEUE(sequence); int index = SEQ_TO_INDEX(sequence); int huge = sequence & SEQ_HUGE_FRAME; int cmd_index; struct iwl_cmd *cmd; /* If a Tx command is being handled and it isn't in the actual * command queue then there a command routing bug has been introduced * in the queue management code. */ if (txq_id != IWL_CMD_QUEUE_NUM) IWL_ERROR("Error wrong command queue %d command id 0x%X\n", txq_id, pkt->hdr.cmd); BUG_ON(txq_id != IWL_CMD_QUEUE_NUM); cmd_index = get_cmd_index(&priv->txq[IWL_CMD_QUEUE_NUM].q, index, huge); cmd = &priv->txq[IWL_CMD_QUEUE_NUM].cmd[cmd_index]; /* Input error checking is done when commands are added to queue. */ if (cmd->meta.flags & CMD_WANT_SKB) { cmd->meta.source->u.skb = rxb->skb; rxb->skb = NULL; } else if (cmd->meta.u.callback && !cmd->meta.u.callback(priv, cmd, rxb->skb)) rxb->skb = NULL; iwl_hcmd_queue_reclaim(priv, txq_id, index); if (!(cmd->meta.flags & CMD_ASYNC)) { clear_bit(STATUS_HCMD_ACTIVE, &priv->status); wake_up_interruptible(&priv->wait_command_queue); } } EXPORT_SYMBOL(iwl_tx_cmd_complete); /* * Find first available (lowest unused) Tx Queue, mark it "active". * Called only when finding queue for aggregation. * Should never return anything < 7, because they should already * be in use as EDCA AC (0-3), Command (4), HCCA (5, 6). */ static int iwl_txq_ctx_activate_free(struct iwl_priv *priv) { int txq_id; for (txq_id = 0; txq_id < priv->hw_params.max_txq_num; txq_id++) if (!test_and_set_bit(txq_id, &priv->txq_ctx_active_msk)) return txq_id; return -1; } int iwl_tx_agg_start(struct iwl_priv *priv, const u8 *ra, u16 tid, u16 *ssn) { int sta_id; int tx_fifo; int txq_id; int ret; unsigned long flags; struct iwl_tid_data *tid_data; DECLARE_MAC_BUF(mac); if (likely(tid < ARRAY_SIZE(default_tid_to_tx_fifo))) tx_fifo = default_tid_to_tx_fifo[tid]; else return -EINVAL; IWL_WARNING("%s on ra = %s tid = %d\n", __func__, print_mac(mac, ra), tid); sta_id = iwl_find_station(priv, ra); if (sta_id == IWL_INVALID_STATION) return -ENXIO; if (priv->stations[sta_id].tid[tid].agg.state != IWL_AGG_OFF) { IWL_ERROR("Start AGG when state is not IWL_AGG_OFF !\n"); return -ENXIO; } txq_id = iwl_txq_ctx_activate_free(priv); if (txq_id == -1) return -ENXIO; spin_lock_irqsave(&priv->sta_lock, flags); tid_data = &priv->stations[sta_id].tid[tid]; *ssn = SEQ_TO_SN(tid_data->seq_number); tid_data->agg.txq_id = txq_id; spin_unlock_irqrestore(&priv->sta_lock, flags); ret = priv->cfg->ops->lib->txq_agg_enable(priv, txq_id, tx_fifo, sta_id, tid, *ssn); if (ret) return ret; if (tid_data->tfds_in_queue == 0) { printk(KERN_ERR "HW queue is empty\n"); tid_data->agg.state = IWL_AGG_ON; ieee80211_start_tx_ba_cb_irqsafe(priv->hw, ra, tid); } else { IWL_DEBUG_HT("HW queue is NOT empty: %d packets in HW queue\n", tid_data->tfds_in_queue); tid_data->agg.state = IWL_EMPTYING_HW_QUEUE_ADDBA; } return ret; } EXPORT_SYMBOL(iwl_tx_agg_start); int iwl_tx_agg_stop(struct iwl_priv *priv , const u8 *ra, u16 tid) { int tx_fifo_id, txq_id, sta_id, ssn = -1; struct iwl_tid_data *tid_data; int ret, write_ptr, read_ptr; unsigned long flags; DECLARE_MAC_BUF(mac); if (!ra) { IWL_ERROR("ra = NULL\n"); return -EINVAL; } if (likely(tid < ARRAY_SIZE(default_tid_to_tx_fifo))) tx_fifo_id = default_tid_to_tx_fifo[tid]; else return -EINVAL; sta_id = iwl_find_station(priv, ra); if (sta_id == IWL_INVALID_STATION) return -ENXIO; if (priv->stations[sta_id].tid[tid].agg.state != IWL_AGG_ON) IWL_WARNING("Stopping AGG while state not IWL_AGG_ON\n"); tid_data = &priv->stations[sta_id].tid[tid]; ssn = (tid_data->seq_number & IEEE80211_SCTL_SEQ) >> 4; txq_id = tid_data->agg.txq_id; write_ptr = priv->txq[txq_id].q.write_ptr; read_ptr = priv->txq[txq_id].q.read_ptr; /* The queue is not empty */ if (write_ptr != read_ptr) { IWL_DEBUG_HT("Stopping a non empty AGG HW QUEUE\n"); priv->stations[sta_id].tid[tid].agg.state = IWL_EMPTYING_HW_QUEUE_DELBA; return 0; } IWL_DEBUG_HT("HW queue is empty\n"); priv->stations[sta_id].tid[tid].agg.state = IWL_AGG_OFF; spin_lock_irqsave(&priv->lock, flags); ret = priv->cfg->ops->lib->txq_agg_disable(priv, txq_id, ssn, tx_fifo_id); spin_unlock_irqrestore(&priv->lock, flags); if (ret) return ret; ieee80211_stop_tx_ba_cb_irqsafe(priv->hw, ra, tid); return 0; } EXPORT_SYMBOL(iwl_tx_agg_stop); int iwl_txq_check_empty(struct iwl_priv *priv, int sta_id, u8 tid, int txq_id) { struct iwl_queue *q = &priv->txq[txq_id].q; u8 *addr = priv->stations[sta_id].sta.sta.addr; struct iwl_tid_data *tid_data = &priv->stations[sta_id].tid[tid]; switch (priv->stations[sta_id].tid[tid].agg.state) { case IWL_EMPTYING_HW_QUEUE_DELBA: /* We are reclaiming the last packet of the */ /* aggregated HW queue */ if (txq_id == tid_data->agg.txq_id && q->read_ptr == q->write_ptr) { u16 ssn = SEQ_TO_SN(tid_data->seq_number); int tx_fifo = default_tid_to_tx_fifo[tid]; IWL_DEBUG_HT("HW queue empty: continue DELBA flow\n"); priv->cfg->ops->lib->txq_agg_disable(priv, txq_id, ssn, tx_fifo); tid_data->agg.state = IWL_AGG_OFF; ieee80211_stop_tx_ba_cb_irqsafe(priv->hw, addr, tid); } break; case IWL_EMPTYING_HW_QUEUE_ADDBA: /* We are reclaiming the last packet of the queue */ if (tid_data->tfds_in_queue == 0) { IWL_DEBUG_HT("HW queue empty: continue ADDBA flow\n"); tid_data->agg.state = IWL_AGG_ON; ieee80211_start_tx_ba_cb_irqsafe(priv->hw, addr, tid); } break; } return 0; } EXPORT_SYMBOL(iwl_txq_check_empty); #ifdef CONFIG_IWLWIF_DEBUG #define TX_STATUS_ENTRY(x) case TX_STATUS_FAIL_ ## x: return #x const char *iwl_get_tx_fail_reason(u32 status) { switch (status & TX_STATUS_MSK) { case TX_STATUS_SUCCESS: return "SUCCESS"; TX_STATUS_ENTRY(SHORT_LIMIT); TX_STATUS_ENTRY(LONG_LIMIT); TX_STATUS_ENTRY(FIFO_UNDERRUN); TX_STATUS_ENTRY(MGMNT_ABORT); TX_STATUS_ENTRY(NEXT_FRAG); TX_STATUS_ENTRY(LIFE_EXPIRE); TX_STATUS_ENTRY(DEST_PS); TX_STATUS_ENTRY(ABORTED); TX_STATUS_ENTRY(BT_RETRY); TX_STATUS_ENTRY(STA_INVALID); TX_STATUS_ENTRY(FRAG_DROPPED); TX_STATUS_ENTRY(TID_DISABLE); TX_STATUS_ENTRY(FRAME_FLUSHED); TX_STATUS_ENTRY(INSUFFICIENT_CF_POLL); TX_STATUS_ENTRY(TX_LOCKED); TX_STATUS_ENTRY(NO_BEACON_ON_RADAR); } return "UNKNOWN"; } EXPORT_SYMBOL(iwl_get_tx_fail_reason); #endif /* CONFIG_IWLWIFI_DEBUG */