/****************************************************************************** * * GPL LICENSE SUMMARY * * Copyright(c) 2008 - 2010 Intel Corporation. All rights reserved. * * 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.GPL. * * Contact Information: * Intel Linux Wireless * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 * *****************************************************************************/ #include #include #include #include #include #include "iwl-dev.h" #include "iwl-core.h" #include "iwl-io.h" #include "iwl-helpers.h" #include "iwl-agn-hw.h" #include "iwl-agn.h" static inline u32 iwlagn_get_scd_ssn(struct iwl5000_tx_resp *tx_resp) { return le32_to_cpup((__le32 *)&tx_resp->status + tx_resp->frame_count) & MAX_SN; } static int iwlagn_tx_status_reply_tx(struct iwl_priv *priv, struct iwl_ht_agg *agg, struct iwl5000_tx_resp *tx_resp, int txq_id, u16 start_idx) { u16 status; struct agg_tx_status *frame_status = &tx_resp->status; struct ieee80211_tx_info *info = NULL; struct ieee80211_hdr *hdr = NULL; u32 rate_n_flags = le32_to_cpu(tx_resp->rate_n_flags); int i, sh, idx; u16 seq; if (agg->wait_for_ba) IWL_DEBUG_TX_REPLY(priv, "got tx response w/o block-ack\n"); agg->frame_count = tx_resp->frame_count; agg->start_idx = start_idx; agg->rate_n_flags = rate_n_flags; agg->bitmap = 0; /* # frames attempted by Tx command */ if (agg->frame_count == 1) { /* Only one frame was attempted; no block-ack will arrive */ status = le16_to_cpu(frame_status[0].status); idx = start_idx; /* FIXME: code repetition */ IWL_DEBUG_TX_REPLY(priv, "FrameCnt = %d, StartIdx=%d idx=%d\n", agg->frame_count, agg->start_idx, idx); info = IEEE80211_SKB_CB(priv->txq[txq_id].txb[idx].skb[0]); info->status.rates[0].count = tx_resp->failure_frame + 1; info->flags &= ~IEEE80211_TX_CTL_AMPDU; info->flags |= iwl_tx_status_to_mac80211(status); iwlagn_hwrate_to_tx_control(priv, rate_n_flags, info); /* FIXME: code repetition end */ IWL_DEBUG_TX_REPLY(priv, "1 Frame 0x%x failure :%d\n", status & 0xff, tx_resp->failure_frame); IWL_DEBUG_TX_REPLY(priv, "Rate Info rate_n_flags=%x\n", rate_n_flags); agg->wait_for_ba = 0; } else { /* Two or more frames were attempted; expect block-ack */ u64 bitmap = 0; int start = agg->start_idx; /* Construct bit-map of pending frames within Tx window */ for (i = 0; i < agg->frame_count; i++) { u16 sc; status = le16_to_cpu(frame_status[i].status); seq = le16_to_cpu(frame_status[i].sequence); idx = SEQ_TO_INDEX(seq); txq_id = SEQ_TO_QUEUE(seq); if (status & (AGG_TX_STATE_FEW_BYTES_MSK | AGG_TX_STATE_ABORT_MSK)) continue; IWL_DEBUG_TX_REPLY(priv, "FrameCnt = %d, txq_id=%d idx=%d\n", agg->frame_count, txq_id, idx); hdr = iwl_tx_queue_get_hdr(priv, txq_id, idx); if (!hdr) { IWL_ERR(priv, "BUG_ON idx doesn't point to valid skb" " idx=%d, txq_id=%d\n", idx, txq_id); return -1; } sc = le16_to_cpu(hdr->seq_ctrl); if (idx != (SEQ_TO_SN(sc) & 0xff)) { IWL_ERR(priv, "BUG_ON idx doesn't match seq control" " idx=%d, seq_idx=%d, seq=%d\n", idx, SEQ_TO_SN(sc), hdr->seq_ctrl); return -1; } IWL_DEBUG_TX_REPLY(priv, "AGG Frame i=%d idx %d seq=%d\n", i, idx, SEQ_TO_SN(sc)); sh = idx - start; if (sh > 64) { sh = (start - idx) + 0xff; bitmap = bitmap << sh; sh = 0; start = idx; } else if (sh < -64) sh = 0xff - (start - idx); else if (sh < 0) { sh = start - idx; start = idx; bitmap = bitmap << sh; sh = 0; } bitmap |= 1ULL << sh; IWL_DEBUG_TX_REPLY(priv, "start=%d bitmap=0x%llx\n", start, (unsigned long long)bitmap); } agg->bitmap = bitmap; agg->start_idx = start; IWL_DEBUG_TX_REPLY(priv, "Frames %d start_idx=%d bitmap=0x%llx\n", agg->frame_count, agg->start_idx, (unsigned long long)agg->bitmap); if (bitmap) agg->wait_for_ba = 1; } return 0; } void iwl_check_abort_status(struct iwl_priv *priv, u8 frame_count, u32 status) { if (frame_count == 1 && status == TX_STATUS_FAIL_RFKILL_FLUSH) { IWL_ERR(priv, "TODO: Implement Tx flush command!!!\n"); } } static void iwlagn_rx_reply_tx(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb) { struct iwl_rx_packet *pkt = rxb_addr(rxb); u16 sequence = le16_to_cpu(pkt->hdr.sequence); int txq_id = SEQ_TO_QUEUE(sequence); int index = SEQ_TO_INDEX(sequence); struct iwl_tx_queue *txq = &priv->txq[txq_id]; struct ieee80211_tx_info *info; struct iwl5000_tx_resp *tx_resp = (void *)&pkt->u.raw[0]; u32 status = le16_to_cpu(tx_resp->status.status); int tid; int sta_id; int freed; if ((index >= txq->q.n_bd) || (iwl_queue_used(&txq->q, index) == 0)) { IWL_ERR(priv, "Read index for DMA queue txq_id (%d) index %d " "is out of range [0-%d] %d %d\n", txq_id, index, txq->q.n_bd, txq->q.write_ptr, txq->q.read_ptr); return; } info = IEEE80211_SKB_CB(txq->txb[txq->q.read_ptr].skb[0]); memset(&info->status, 0, sizeof(info->status)); tid = (tx_resp->ra_tid & IWL50_TX_RES_TID_MSK) >> IWL50_TX_RES_TID_POS; sta_id = (tx_resp->ra_tid & IWL50_TX_RES_RA_MSK) >> IWL50_TX_RES_RA_POS; if (txq->sched_retry) { const u32 scd_ssn = iwlagn_get_scd_ssn(tx_resp); struct iwl_ht_agg *agg = NULL; agg = &priv->stations[sta_id].tid[tid].agg; iwlagn_tx_status_reply_tx(priv, agg, tx_resp, txq_id, index); /* check if BAR is needed */ if ((tx_resp->frame_count == 1) && !iwl_is_tx_success(status)) info->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK; if (txq->q.read_ptr != (scd_ssn & 0xff)) { index = iwl_queue_dec_wrap(scd_ssn & 0xff, txq->q.n_bd); IWL_DEBUG_TX_REPLY(priv, "Retry scheduler reclaim " "scd_ssn=%d idx=%d txq=%d swq=%d\n", scd_ssn , index, txq_id, txq->swq_id); freed = iwlagn_tx_queue_reclaim(priv, txq_id, index); iwl_free_tfds_in_queue(priv, sta_id, tid, freed); if (priv->mac80211_registered && (iwl_queue_space(&txq->q) > txq->q.low_mark) && (agg->state != IWL_EMPTYING_HW_QUEUE_DELBA)) { if (agg->state == IWL_AGG_OFF) iwl_wake_queue(priv, txq_id); else iwl_wake_queue(priv, txq->swq_id); } } } else { BUG_ON(txq_id != txq->swq_id); info->status.rates[0].count = tx_resp->failure_frame + 1; info->flags |= iwl_tx_status_to_mac80211(status); iwlagn_hwrate_to_tx_control(priv, le32_to_cpu(tx_resp->rate_n_flags), info); IWL_DEBUG_TX_REPLY(priv, "TXQ %d status %s (0x%08x) rate_n_flags " "0x%x retries %d\n", txq_id, iwl_get_tx_fail_reason(status), status, le32_to_cpu(tx_resp->rate_n_flags), tx_resp->failure_frame); freed = iwlagn_tx_queue_reclaim(priv, txq_id, index); iwl_free_tfds_in_queue(priv, sta_id, tid, freed); if (priv->mac80211_registered && (iwl_queue_space(&txq->q) > txq->q.low_mark)) iwl_wake_queue(priv, txq_id); } iwlagn_txq_check_empty(priv, sta_id, tid, txq_id); iwl_check_abort_status(priv, tx_resp->frame_count, status); } void iwlagn_rx_handler_setup(struct iwl_priv *priv) { /* init calibration handlers */ priv->rx_handlers[CALIBRATION_RES_NOTIFICATION] = iwlagn_rx_calib_result; priv->rx_handlers[CALIBRATION_COMPLETE_NOTIFICATION] = iwlagn_rx_calib_complete; priv->rx_handlers[REPLY_TX] = iwlagn_rx_reply_tx; } void iwlagn_setup_deferred_work(struct iwl_priv *priv) { /* in agn, the tx power calibration is done in uCode */ priv->disable_tx_power_cal = 1; } int iwlagn_hw_valid_rtc_data_addr(u32 addr) { return (addr >= IWLAGN_RTC_DATA_LOWER_BOUND) && (addr < IWLAGN_RTC_DATA_UPPER_BOUND); } int iwlagn_send_tx_power(struct iwl_priv *priv) { struct iwl5000_tx_power_dbm_cmd tx_power_cmd; u8 tx_ant_cfg_cmd; /* half dBm need to multiply */ tx_power_cmd.global_lmt = (s8)(2 * priv->tx_power_user_lmt); if (priv->tx_power_lmt_in_half_dbm && priv->tx_power_lmt_in_half_dbm < tx_power_cmd.global_lmt) { /* * For the newer devices which using enhanced/extend tx power * table in EEPROM, the format is in half dBm. driver need to * convert to dBm format before report to mac80211. * By doing so, there is a possibility of 1/2 dBm resolution * lost. driver will perform "round-up" operation before * reporting, but it will cause 1/2 dBm tx power over the * regulatory limit. Perform the checking here, if the * "tx_power_user_lmt" is higher than EEPROM value (in * half-dBm format), lower the tx power based on EEPROM */ tx_power_cmd.global_lmt = priv->tx_power_lmt_in_half_dbm; } tx_power_cmd.flags = IWL50_TX_POWER_NO_CLOSED; tx_power_cmd.srv_chan_lmt = IWL50_TX_POWER_AUTO; if (IWL_UCODE_API(priv->ucode_ver) == 1) tx_ant_cfg_cmd = REPLY_TX_POWER_DBM_CMD_V1; else tx_ant_cfg_cmd = REPLY_TX_POWER_DBM_CMD; return iwl_send_cmd_pdu_async(priv, tx_ant_cfg_cmd, sizeof(tx_power_cmd), &tx_power_cmd, NULL); } void iwlagn_temperature(struct iwl_priv *priv) { /* store temperature from statistics (in Celsius) */ priv->temperature = le32_to_cpu(priv->statistics.general.temperature); iwl_tt_handler(priv); } u16 iwlagn_eeprom_calib_version(struct iwl_priv *priv) { struct iwl_eeprom_calib_hdr { u8 version; u8 pa_type; u16 voltage; } *hdr; hdr = (struct iwl_eeprom_calib_hdr *)iwl_eeprom_query_addr(priv, EEPROM_CALIB_ALL); return hdr->version; } /* * EEPROM */ static u32 eeprom_indirect_address(const struct iwl_priv *priv, u32 address) { u16 offset = 0; if ((address & INDIRECT_ADDRESS) == 0) return address; switch (address & INDIRECT_TYPE_MSK) { case INDIRECT_HOST: offset = iwl_eeprom_query16(priv, EEPROM_LINK_HOST); break; case INDIRECT_GENERAL: offset = iwl_eeprom_query16(priv, EEPROM_LINK_GENERAL); break; case INDIRECT_REGULATORY: offset = iwl_eeprom_query16(priv, EEPROM_LINK_REGULATORY); break; case INDIRECT_CALIBRATION: offset = iwl_eeprom_query16(priv, EEPROM_LINK_CALIBRATION); break; case INDIRECT_PROCESS_ADJST: offset = iwl_eeprom_query16(priv, EEPROM_LINK_PROCESS_ADJST); break; case INDIRECT_OTHERS: offset = iwl_eeprom_query16(priv, EEPROM_LINK_OTHERS); break; default: IWL_ERR(priv, "illegal indirect type: 0x%X\n", address & INDIRECT_TYPE_MSK); break; } /* translate the offset from words to byte */ return (address & ADDRESS_MSK) + (offset << 1); } const u8 *iwlagn_eeprom_query_addr(const struct iwl_priv *priv, size_t offset) { u32 address = eeprom_indirect_address(priv, offset); BUG_ON(address >= priv->cfg->eeprom_size); return &priv->eeprom[address]; } struct iwl_mod_params iwlagn_mod_params = { .amsdu_size_8K = 1, .restart_fw = 1, /* the rest are 0 by default */ }; void iwlagn_rx_queue_reset(struct iwl_priv *priv, struct iwl_rx_queue *rxq) { unsigned long flags; int i; spin_lock_irqsave(&rxq->lock, flags); INIT_LIST_HEAD(&rxq->rx_free); INIT_LIST_HEAD(&rxq->rx_used); /* Fill the rx_used queue with _all_ of the Rx buffers */ for (i = 0; i < RX_FREE_BUFFERS + RX_QUEUE_SIZE; i++) { /* In the reset function, these buffers may have been allocated * to an SKB, so we need to unmap and free potential storage */ if (rxq->pool[i].page != NULL) { pci_unmap_page(priv->pci_dev, rxq->pool[i].page_dma, PAGE_SIZE << priv->hw_params.rx_page_order, PCI_DMA_FROMDEVICE); __iwl_free_pages(priv, rxq->pool[i].page); rxq->pool[i].page = NULL; } list_add_tail(&rxq->pool[i].list, &rxq->rx_used); } for (i = 0; i < RX_QUEUE_SIZE; i++) rxq->queue[i] = NULL; /* Set us so that we have processed and used all buffers, but have * not restocked the Rx queue with fresh buffers */ rxq->read = rxq->write = 0; rxq->write_actual = 0; rxq->free_count = 0; spin_unlock_irqrestore(&rxq->lock, flags); } int iwlagn_rx_init(struct iwl_priv *priv, struct iwl_rx_queue *rxq) { u32 rb_size; const u32 rfdnlog = RX_QUEUE_SIZE_LOG; /* 256 RBDs */ u32 rb_timeout = 0; /* FIXME: RX_RB_TIMEOUT for all devices? */ if (!priv->cfg->use_isr_legacy) rb_timeout = RX_RB_TIMEOUT; if (priv->cfg->mod_params->amsdu_size_8K) rb_size = FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_8K; else rb_size = FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_4K; /* Stop Rx DMA */ iwl_write_direct32(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG, 0); /* Reset driver's Rx queue write index */ iwl_write_direct32(priv, FH_RSCSR_CHNL0_RBDCB_WPTR_REG, 0); /* Tell device where to find RBD circular buffer in DRAM */ iwl_write_direct32(priv, FH_RSCSR_CHNL0_RBDCB_BASE_REG, (u32)(rxq->dma_addr >> 8)); /* Tell device where in DRAM to update its Rx status */ iwl_write_direct32(priv, FH_RSCSR_CHNL0_STTS_WPTR_REG, rxq->rb_stts_dma >> 4); /* Enable Rx DMA * FH_RCSR_CHNL0_RX_IGNORE_RXF_EMPTY is set because of HW bug in * the credit mechanism in 5000 HW RX FIFO * Direct rx interrupts to hosts * Rx buffer size 4 or 8k * RB timeout 0x10 * 256 RBDs */ iwl_write_direct32(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG, FH_RCSR_RX_CONFIG_CHNL_EN_ENABLE_VAL | FH_RCSR_CHNL0_RX_IGNORE_RXF_EMPTY | FH_RCSR_CHNL0_RX_CONFIG_IRQ_DEST_INT_HOST_VAL | FH_RCSR_CHNL0_RX_CONFIG_SINGLE_FRAME_MSK | rb_size| (rb_timeout << FH_RCSR_RX_CONFIG_REG_IRQ_RBTH_POS)| (rfdnlog << FH_RCSR_RX_CONFIG_RBDCB_SIZE_POS)); /* Set interrupt coalescing timer to default (2048 usecs) */ iwl_write8(priv, CSR_INT_COALESCING, IWL_HOST_INT_TIMEOUT_DEF); return 0; } int iwlagn_hw_nic_init(struct iwl_priv *priv) { unsigned long flags; struct iwl_rx_queue *rxq = &priv->rxq; int ret; /* nic_init */ spin_lock_irqsave(&priv->lock, flags); priv->cfg->ops->lib->apm_ops.init(priv); /* Set interrupt coalescing calibration timer to default (512 usecs) */ iwl_write8(priv, CSR_INT_COALESCING, IWL_HOST_INT_CALIB_TIMEOUT_DEF); spin_unlock_irqrestore(&priv->lock, flags); ret = priv->cfg->ops->lib->apm_ops.set_pwr_src(priv, IWL_PWR_SRC_VMAIN); priv->cfg->ops->lib->apm_ops.config(priv); /* Allocate the RX queue, or reset if it is already allocated */ if (!rxq->bd) { ret = iwl_rx_queue_alloc(priv); if (ret) { IWL_ERR(priv, "Unable to initialize Rx queue\n"); return -ENOMEM; } } else iwlagn_rx_queue_reset(priv, rxq); iwlagn_rx_replenish(priv); iwlagn_rx_init(priv, rxq); spin_lock_irqsave(&priv->lock, flags); rxq->need_update = 1; iwl_rx_queue_update_write_ptr(priv, rxq); spin_unlock_irqrestore(&priv->lock, flags); /* Allocate or reset and init all Tx and Command queues */ if (!priv->txq) { ret = iwlagn_txq_ctx_alloc(priv); if (ret) return ret; } else iwlagn_txq_ctx_reset(priv); set_bit(STATUS_INIT, &priv->status); return 0; } /** * iwlagn_dma_addr2rbd_ptr - convert a DMA address to a uCode read buffer ptr */ static inline __le32 iwlagn_dma_addr2rbd_ptr(struct iwl_priv *priv, dma_addr_t dma_addr) { return cpu_to_le32((u32)(dma_addr >> 8)); } /** * iwlagn_rx_queue_restock - refill RX queue from pre-allocated pool * * If there are slots in the RX queue that need to be restocked, * and we have free pre-allocated buffers, fill the ranks as much * as we can, pulling from rx_free. * * This moves the 'write' index forward to catch up with 'processed', and * also updates the memory address in the firmware to reference the new * target buffer. */ void iwlagn_rx_queue_restock(struct iwl_priv *priv) { struct iwl_rx_queue *rxq = &priv->rxq; struct list_head *element; struct iwl_rx_mem_buffer *rxb; unsigned long flags; spin_lock_irqsave(&rxq->lock, flags); while ((iwl_rx_queue_space(rxq) > 0) && (rxq->free_count)) { /* The overwritten rxb must be a used one */ rxb = rxq->queue[rxq->write]; BUG_ON(rxb && rxb->page); /* Get next free Rx buffer, remove from free list */ element = rxq->rx_free.next; rxb = list_entry(element, struct iwl_rx_mem_buffer, list); list_del(element); /* Point to Rx buffer via next RBD in circular buffer */ rxq->bd[rxq->write] = iwlagn_dma_addr2rbd_ptr(priv, rxb->page_dma); rxq->queue[rxq->write] = rxb; rxq->write = (rxq->write + 1) & RX_QUEUE_MASK; rxq->free_count--; } spin_unlock_irqrestore(&rxq->lock, flags); /* If the pre-allocated buffer pool is dropping low, schedule to * refill it */ if (rxq->free_count <= RX_LOW_WATERMARK) queue_work(priv->workqueue, &priv->rx_replenish); /* If we've added more space for the firmware to place data, tell it. * Increment device's write pointer in multiples of 8. */ if (rxq->write_actual != (rxq->write & ~0x7)) { spin_lock_irqsave(&rxq->lock, flags); rxq->need_update = 1; spin_unlock_irqrestore(&rxq->lock, flags); iwl_rx_queue_update_write_ptr(priv, rxq); } } /** * iwlagn_rx_replenish - Move all used packet from rx_used to rx_free * * When moving to rx_free an SKB is allocated for the slot. * * Also restock the Rx queue via iwl_rx_queue_restock. * This is called as a scheduled work item (except for during initialization) */ void iwlagn_rx_allocate(struct iwl_priv *priv, gfp_t priority) { struct iwl_rx_queue *rxq = &priv->rxq; struct list_head *element; struct iwl_rx_mem_buffer *rxb; struct page *page; unsigned long flags; gfp_t gfp_mask = priority; while (1) { spin_lock_irqsave(&rxq->lock, flags); if (list_empty(&rxq->rx_used)) { spin_unlock_irqrestore(&rxq->lock, flags); return; } spin_unlock_irqrestore(&rxq->lock, flags); if (rxq->free_count > RX_LOW_WATERMARK) gfp_mask |= __GFP_NOWARN; if (priv->hw_params.rx_page_order > 0) gfp_mask |= __GFP_COMP; /* Alloc a new receive buffer */ page = alloc_pages(gfp_mask, priv->hw_params.rx_page_order); if (!page) { if (net_ratelimit()) IWL_DEBUG_INFO(priv, "alloc_pages failed, " "order: %d\n", priv->hw_params.rx_page_order); if ((rxq->free_count <= RX_LOW_WATERMARK) && net_ratelimit()) IWL_CRIT(priv, "Failed to alloc_pages with %s. Only %u free buffers remaining.\n", priority == GFP_ATOMIC ? "GFP_ATOMIC" : "GFP_KERNEL", rxq->free_count); /* We don't reschedule replenish work here -- we will * call the restock method and if it still needs * more buffers it will schedule replenish */ return; } spin_lock_irqsave(&rxq->lock, flags); if (list_empty(&rxq->rx_used)) { spin_unlock_irqrestore(&rxq->lock, flags); __free_pages(page, priv->hw_params.rx_page_order); return; } element = rxq->rx_used.next; rxb = list_entry(element, struct iwl_rx_mem_buffer, list); list_del(element); spin_unlock_irqrestore(&rxq->lock, flags); BUG_ON(rxb->page); rxb->page = page; /* Get physical address of the RB */ rxb->page_dma = pci_map_page(priv->pci_dev, page, 0, PAGE_SIZE << priv->hw_params.rx_page_order, PCI_DMA_FROMDEVICE); /* dma address must be no more than 36 bits */ BUG_ON(rxb->page_dma & ~DMA_BIT_MASK(36)); /* and also 256 byte aligned! */ BUG_ON(rxb->page_dma & DMA_BIT_MASK(8)); spin_lock_irqsave(&rxq->lock, flags); list_add_tail(&rxb->list, &rxq->rx_free); rxq->free_count++; priv->alloc_rxb_page++; spin_unlock_irqrestore(&rxq->lock, flags); } } void iwlagn_rx_replenish(struct iwl_priv *priv) { unsigned long flags; iwlagn_rx_allocate(priv, GFP_KERNEL); spin_lock_irqsave(&priv->lock, flags); iwlagn_rx_queue_restock(priv); spin_unlock_irqrestore(&priv->lock, flags); } void iwlagn_rx_replenish_now(struct iwl_priv *priv) { iwlagn_rx_allocate(priv, GFP_ATOMIC); iwlagn_rx_queue_restock(priv); } /* Assumes that the skb field of the buffers in 'pool' is kept accurate. * If an SKB has been detached, the POOL needs to have its SKB set to NULL * This free routine walks the list of POOL entries and if SKB is set to * non NULL it is unmapped and freed */ void iwlagn_rx_queue_free(struct iwl_priv *priv, struct iwl_rx_queue *rxq) { int i; for (i = 0; i < RX_QUEUE_SIZE + RX_FREE_BUFFERS; i++) { if (rxq->pool[i].page != NULL) { pci_unmap_page(priv->pci_dev, rxq->pool[i].page_dma, PAGE_SIZE << priv->hw_params.rx_page_order, PCI_DMA_FROMDEVICE); __iwl_free_pages(priv, rxq->pool[i].page); rxq->pool[i].page = NULL; } } dma_free_coherent(&priv->pci_dev->dev, 4 * RX_QUEUE_SIZE, rxq->bd, rxq->dma_addr); dma_free_coherent(&priv->pci_dev->dev, sizeof(struct iwl_rb_status), rxq->rb_stts, rxq->rb_stts_dma); rxq->bd = NULL; rxq->rb_stts = NULL; } int iwlagn_rxq_stop(struct iwl_priv *priv) { /* stop Rx DMA */ iwl_write_direct32(priv, FH_MEM_RCSR_CHNL0_CONFIG_REG, 0); iwl_poll_direct_bit(priv, FH_MEM_RSSR_RX_STATUS_REG, FH_RSSR_CHNL0_RX_STATUS_CHNL_IDLE, 1000); return 0; } int iwlagn_hwrate_to_mac80211_idx(u32 rate_n_flags, enum ieee80211_band band) { int idx = 0; int band_offset = 0; /* HT rate format: mac80211 wants an MCS number, which is just LSB */ if (rate_n_flags & RATE_MCS_HT_MSK) { idx = (rate_n_flags & 0xff); return idx; /* Legacy rate format, search for match in table */ } else { if (band == IEEE80211_BAND_5GHZ) band_offset = IWL_FIRST_OFDM_RATE; for (idx = band_offset; idx < IWL_RATE_COUNT_LEGACY; idx++) if (iwl_rates[idx].plcp == (rate_n_flags & 0xFF)) return idx - band_offset; } return -1; } /* Calc max signal level (dBm) among 3 possible receivers */ static inline int iwlagn_calc_rssi(struct iwl_priv *priv, struct iwl_rx_phy_res *rx_resp) { return priv->cfg->ops->utils->calc_rssi(priv, rx_resp); } #ifdef CONFIG_IWLWIFI_DEBUG /** * iwlagn_dbg_report_frame - dump frame to syslog during debug sessions * * You may hack this function to show different aspects of received frames, * including selective frame dumps. * group100 parameter selects whether to show 1 out of 100 good data frames. * All beacon and probe response frames are printed. */ static void iwlagn_dbg_report_frame(struct iwl_priv *priv, struct iwl_rx_phy_res *phy_res, u16 length, struct ieee80211_hdr *header, int group100) { u32 to_us; u32 print_summary = 0; u32 print_dump = 0; /* set to 1 to dump all frames' contents */ u32 hundred = 0; u32 dataframe = 0; __le16 fc; u16 seq_ctl; u16 channel; u16 phy_flags; u32 rate_n_flags; u32 tsf_low; int rssi; if (likely(!(iwl_get_debug_level(priv) & IWL_DL_RX))) return; /* MAC header */ fc = header->frame_control; seq_ctl = le16_to_cpu(header->seq_ctrl); /* metadata */ channel = le16_to_cpu(phy_res->channel); phy_flags = le16_to_cpu(phy_res->phy_flags); rate_n_flags = le32_to_cpu(phy_res->rate_n_flags); /* signal statistics */ rssi = iwlagn_calc_rssi(priv, phy_res); tsf_low = le64_to_cpu(phy_res->timestamp) & 0x0ffffffff; to_us = !compare_ether_addr(header->addr1, priv->mac_addr); /* if data frame is to us and all is good, * (optionally) print summary for only 1 out of every 100 */ if (to_us && (fc & ~cpu_to_le16(IEEE80211_FCTL_PROTECTED)) == cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FTYPE_DATA)) { dataframe = 1; if (!group100) print_summary = 1; /* print each frame */ else if (priv->framecnt_to_us < 100) { priv->framecnt_to_us++; print_summary = 0; } else { priv->framecnt_to_us = 0; print_summary = 1; hundred = 1; } } else { /* print summary for all other frames */ print_summary = 1; } if (print_summary) { char *title; int rate_idx; u32 bitrate; if (hundred) title = "100Frames"; else if (ieee80211_has_retry(fc)) title = "Retry"; else if (ieee80211_is_assoc_resp(fc)) title = "AscRsp"; else if (ieee80211_is_reassoc_resp(fc)) title = "RasRsp"; else if (ieee80211_is_probe_resp(fc)) { title = "PrbRsp"; print_dump = 1; /* dump frame contents */ } else if (ieee80211_is_beacon(fc)) { title = "Beacon"; print_dump = 1; /* dump frame contents */ } else if (ieee80211_is_atim(fc)) title = "ATIM"; else if (ieee80211_is_auth(fc)) title = "Auth"; else if (ieee80211_is_deauth(fc)) title = "DeAuth"; else if (ieee80211_is_disassoc(fc)) title = "DisAssoc"; else title = "Frame"; rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags); if (unlikely((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT))) { bitrate = 0; WARN_ON_ONCE(1); } else { bitrate = iwl_rates[rate_idx].ieee / 2; } /* print frame summary. * MAC addresses show just the last byte (for brevity), * but you can hack it to show more, if you'd like to. */ if (dataframe) IWL_DEBUG_RX(priv, "%s: mhd=0x%04x, dst=0x%02x, " "len=%u, rssi=%d, chnl=%d, rate=%u,\n", title, le16_to_cpu(fc), header->addr1[5], length, rssi, channel, bitrate); else { /* src/dst addresses assume managed mode */ IWL_DEBUG_RX(priv, "%s: 0x%04x, dst=0x%02x, src=0x%02x, " "len=%u, rssi=%d, tim=%lu usec, " "phy=0x%02x, chnl=%d\n", title, le16_to_cpu(fc), header->addr1[5], header->addr3[5], length, rssi, tsf_low - priv->scan_start_tsf, phy_flags, channel); } } if (print_dump) iwl_print_hex_dump(priv, IWL_DL_RX, header, length); } #endif static u32 iwlagn_translate_rx_status(struct iwl_priv *priv, u32 decrypt_in) { u32 decrypt_out = 0; if ((decrypt_in & RX_RES_STATUS_STATION_FOUND) == RX_RES_STATUS_STATION_FOUND) decrypt_out |= (RX_RES_STATUS_STATION_FOUND | RX_RES_STATUS_NO_STATION_INFO_MISMATCH); decrypt_out |= (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK); /* packet was not encrypted */ if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) == RX_RES_STATUS_SEC_TYPE_NONE) return decrypt_out; /* packet was encrypted with unknown alg */ if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) == RX_RES_STATUS_SEC_TYPE_ERR) return decrypt_out; /* decryption was not done in HW */ if ((decrypt_in & RX_MPDU_RES_STATUS_DEC_DONE_MSK) != RX_MPDU_RES_STATUS_DEC_DONE_MSK) return decrypt_out; switch (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) { case RX_RES_STATUS_SEC_TYPE_CCMP: /* alg is CCM: check MIC only */ if (!(decrypt_in & RX_MPDU_RES_STATUS_MIC_OK)) /* Bad MIC */ decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC; else decrypt_out |= RX_RES_STATUS_DECRYPT_OK; break; case RX_RES_STATUS_SEC_TYPE_TKIP: if (!(decrypt_in & RX_MPDU_RES_STATUS_TTAK_OK)) { /* Bad TTAK */ decrypt_out |= RX_RES_STATUS_BAD_KEY_TTAK; break; } /* fall through if TTAK OK */ default: if (!(decrypt_in & RX_MPDU_RES_STATUS_ICV_OK)) decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC; else decrypt_out |= RX_RES_STATUS_DECRYPT_OK; break; }; IWL_DEBUG_RX(priv, "decrypt_in:0x%x decrypt_out = 0x%x\n", decrypt_in, decrypt_out); return decrypt_out; } static void iwlagn_pass_packet_to_mac80211(struct iwl_priv *priv, struct ieee80211_hdr *hdr, u16 len, u32 ampdu_status, struct iwl_rx_mem_buffer *rxb, struct ieee80211_rx_status *stats) { struct sk_buff *skb; __le16 fc = hdr->frame_control; /* We only process data packets if the interface is open */ if (unlikely(!priv->is_open)) { IWL_DEBUG_DROP_LIMIT(priv, "Dropping packet while interface is not open.\n"); return; } /* In case of HW accelerated crypto and bad decryption, drop */ if (!priv->cfg->mod_params->sw_crypto && iwl_set_decrypted_flag(priv, hdr, ampdu_status, stats)) return; skb = dev_alloc_skb(128); if (!skb) { IWL_ERR(priv, "dev_alloc_skb failed\n"); return; } skb_add_rx_frag(skb, 0, rxb->page, (void *)hdr - rxb_addr(rxb), len); iwl_update_stats(priv, false, fc, len); memcpy(IEEE80211_SKB_RXCB(skb), stats, sizeof(*stats)); ieee80211_rx(priv->hw, skb); priv->alloc_rxb_page--; rxb->page = NULL; } /* Called for REPLY_RX (legacy ABG frames), or * REPLY_RX_MPDU_CMD (HT high-throughput N frames). */ void iwlagn_rx_reply_rx(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb) { struct ieee80211_hdr *header; struct ieee80211_rx_status rx_status; struct iwl_rx_packet *pkt = rxb_addr(rxb); struct iwl_rx_phy_res *phy_res; __le32 rx_pkt_status; struct iwl4965_rx_mpdu_res_start *amsdu; u32 len; u32 ampdu_status; u32 rate_n_flags; /** * REPLY_RX and REPLY_RX_MPDU_CMD are handled differently. * REPLY_RX: physical layer info is in this buffer * REPLY_RX_MPDU_CMD: physical layer info was sent in separate * command and cached in priv->last_phy_res * * Here we set up local variables depending on which command is * received. */ if (pkt->hdr.cmd == REPLY_RX) { phy_res = (struct iwl_rx_phy_res *)pkt->u.raw; header = (struct ieee80211_hdr *)(pkt->u.raw + sizeof(*phy_res) + phy_res->cfg_phy_cnt); len = le16_to_cpu(phy_res->byte_count); rx_pkt_status = *(__le32 *)(pkt->u.raw + sizeof(*phy_res) + phy_res->cfg_phy_cnt + len); ampdu_status = le32_to_cpu(rx_pkt_status); } else { if (!priv->_agn.last_phy_res_valid) { IWL_ERR(priv, "MPDU frame without cached PHY data\n"); return; } phy_res = &priv->_agn.last_phy_res; amsdu = (struct iwl4965_rx_mpdu_res_start *)pkt->u.raw; header = (struct ieee80211_hdr *)(pkt->u.raw + sizeof(*amsdu)); len = le16_to_cpu(amsdu->byte_count); rx_pkt_status = *(__le32 *)(pkt->u.raw + sizeof(*amsdu) + len); ampdu_status = iwlagn_translate_rx_status(priv, le32_to_cpu(rx_pkt_status)); } if ((unlikely(phy_res->cfg_phy_cnt > 20))) { IWL_DEBUG_DROP(priv, "dsp size out of range [0,20]: %d/n", phy_res->cfg_phy_cnt); return; } if (!(rx_pkt_status & RX_RES_STATUS_NO_CRC32_ERROR) || !(rx_pkt_status & RX_RES_STATUS_NO_RXE_OVERFLOW)) { IWL_DEBUG_RX(priv, "Bad CRC or FIFO: 0x%08X.\n", le32_to_cpu(rx_pkt_status)); return; } /* This will be used in several places later */ rate_n_flags = le32_to_cpu(phy_res->rate_n_flags); /* rx_status carries information about the packet to mac80211 */ rx_status.mactime = le64_to_cpu(phy_res->timestamp); rx_status.freq = ieee80211_channel_to_frequency(le16_to_cpu(phy_res->channel)); rx_status.band = (phy_res->phy_flags & RX_RES_PHY_FLAGS_BAND_24_MSK) ? IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ; rx_status.rate_idx = iwlagn_hwrate_to_mac80211_idx(rate_n_flags, rx_status.band); rx_status.flag = 0; /* TSF isn't reliable. In order to allow smooth user experience, * this W/A doesn't propagate it to the mac80211 */ /*rx_status.flag |= RX_FLAG_TSFT;*/ priv->ucode_beacon_time = le32_to_cpu(phy_res->beacon_time_stamp); /* Find max signal strength (dBm) among 3 antenna/receiver chains */ rx_status.signal = iwlagn_calc_rssi(priv, phy_res); #ifdef CONFIG_IWLWIFI_DEBUG /* Set "1" to report good data frames in groups of 100 */ if (unlikely(iwl_get_debug_level(priv) & IWL_DL_RX)) iwlagn_dbg_report_frame(priv, phy_res, len, header, 1); #endif iwl_dbg_log_rx_data_frame(priv, len, header); IWL_DEBUG_STATS_LIMIT(priv, "Rssi %d, TSF %llu\n", rx_status.signal, (unsigned long long)rx_status.mactime); /* * "antenna number" * * It seems that the antenna field in the phy flags value * is actually a bit field. This is undefined by radiotap, * it wants an actual antenna number but I always get "7" * for most legacy frames I receive indicating that the * same frame was received on all three RX chains. * * I think this field should be removed in favor of a * new 802.11n radiotap field "RX chains" that is defined * as a bitmask. */ rx_status.antenna = (le16_to_cpu(phy_res->phy_flags) & RX_RES_PHY_FLAGS_ANTENNA_MSK) >> RX_RES_PHY_FLAGS_ANTENNA_POS; /* set the preamble flag if appropriate */ if (phy_res->phy_flags & RX_RES_PHY_FLAGS_SHORT_PREAMBLE_MSK) rx_status.flag |= RX_FLAG_SHORTPRE; /* Set up the HT phy flags */ if (rate_n_flags & RATE_MCS_HT_MSK) rx_status.flag |= RX_FLAG_HT; if (rate_n_flags & RATE_MCS_HT40_MSK) rx_status.flag |= RX_FLAG_40MHZ; if (rate_n_flags & RATE_MCS_SGI_MSK) rx_status.flag |= RX_FLAG_SHORT_GI; iwlagn_pass_packet_to_mac80211(priv, header, len, ampdu_status, rxb, &rx_status); } /* Cache phy data (Rx signal strength, etc) for HT frame (REPLY_RX_PHY_CMD). * This will be used later in iwl_rx_reply_rx() for REPLY_RX_MPDU_CMD. */ void iwlagn_rx_reply_rx_phy(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb) { struct iwl_rx_packet *pkt = rxb_addr(rxb); priv->_agn.last_phy_res_valid = true; memcpy(&priv->_agn.last_phy_res, pkt->u.raw, sizeof(struct iwl_rx_phy_res)); } static int iwl_get_single_channel_for_scan(struct iwl_priv *priv, enum ieee80211_band band, struct iwl_scan_channel *scan_ch) { const struct ieee80211_supported_band *sband; const struct iwl_channel_info *ch_info; u16 passive_dwell = 0; u16 active_dwell = 0; int i, added = 0; u16 channel = 0; sband = iwl_get_hw_mode(priv, band); if (!sband) { IWL_ERR(priv, "invalid band\n"); return added; } active_dwell = iwl_get_active_dwell_time(priv, band, 0); passive_dwell = iwl_get_passive_dwell_time(priv, band); if (passive_dwell <= active_dwell) passive_dwell = active_dwell + 1; /* only scan single channel, good enough to reset the RF */ /* pick the first valid not in-use channel */ if (band == IEEE80211_BAND_5GHZ) { for (i = 14; i < priv->channel_count; i++) { if (priv->channel_info[i].channel != le16_to_cpu(priv->staging_rxon.channel)) { channel = priv->channel_info[i].channel; ch_info = iwl_get_channel_info(priv, band, channel); if (is_channel_valid(ch_info)) break; } } } else { for (i = 0; i < 14; i++) { if (priv->channel_info[i].channel != le16_to_cpu(priv->staging_rxon.channel)) { channel = priv->channel_info[i].channel; ch_info = iwl_get_channel_info(priv, band, channel); if (is_channel_valid(ch_info)) break; } } } if (channel) { scan_ch->channel = cpu_to_le16(channel); scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE; scan_ch->active_dwell = cpu_to_le16(active_dwell); scan_ch->passive_dwell = cpu_to_le16(passive_dwell); /* Set txpower levels to defaults */ scan_ch->dsp_atten = 110; if (band == IEEE80211_BAND_5GHZ) scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3; else scan_ch->tx_gain = ((1 << 5) | (5 << 3)); added++; } else IWL_ERR(priv, "no valid channel found\n"); return added; } static int iwl_get_channels_for_scan(struct iwl_priv *priv, enum ieee80211_band band, u8 is_active, u8 n_probes, struct iwl_scan_channel *scan_ch) { struct ieee80211_channel *chan; const struct ieee80211_supported_band *sband; const struct iwl_channel_info *ch_info; u16 passive_dwell = 0; u16 active_dwell = 0; int added, i; u16 channel; sband = iwl_get_hw_mode(priv, band); if (!sband) return 0; active_dwell = iwl_get_active_dwell_time(priv, band, n_probes); passive_dwell = iwl_get_passive_dwell_time(priv, band); if (passive_dwell <= active_dwell) passive_dwell = active_dwell + 1; for (i = 0, added = 0; i < priv->scan_request->n_channels; i++) { chan = priv->scan_request->channels[i]; if (chan->band != band) continue; channel = ieee80211_frequency_to_channel(chan->center_freq); scan_ch->channel = cpu_to_le16(channel); ch_info = iwl_get_channel_info(priv, band, channel); if (!is_channel_valid(ch_info)) { IWL_DEBUG_SCAN(priv, "Channel %d is INVALID for this band.\n", channel); continue; } if (!is_active || is_channel_passive(ch_info) || (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN)) scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE; else scan_ch->type = SCAN_CHANNEL_TYPE_ACTIVE; if (n_probes) scan_ch->type |= IWL_SCAN_PROBE_MASK(n_probes); scan_ch->active_dwell = cpu_to_le16(active_dwell); scan_ch->passive_dwell = cpu_to_le16(passive_dwell); /* Set txpower levels to defaults */ scan_ch->dsp_atten = 110; /* NOTE: if we were doing 6Mb OFDM for scans we'd use * power level: * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3; */ if (band == IEEE80211_BAND_5GHZ) scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3; else scan_ch->tx_gain = ((1 << 5) | (5 << 3)); IWL_DEBUG_SCAN(priv, "Scanning ch=%d prob=0x%X [%s %d]\n", channel, le32_to_cpu(scan_ch->type), (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ? "ACTIVE" : "PASSIVE", (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ? active_dwell : passive_dwell); scan_ch++; added++; } IWL_DEBUG_SCAN(priv, "total channels to scan %d\n", added); return added; } void iwlagn_request_scan(struct iwl_priv *priv) { struct iwl_host_cmd cmd = { .id = REPLY_SCAN_CMD, .len = sizeof(struct iwl_scan_cmd), .flags = CMD_SIZE_HUGE, }; struct iwl_scan_cmd *scan; struct ieee80211_conf *conf = NULL; u32 rate_flags = 0; u16 cmd_len; u16 rx_chain = 0; enum ieee80211_band band; u8 n_probes = 0; u8 rx_ant = priv->hw_params.valid_rx_ant; u8 rate; bool is_active = false; int chan_mod; u8 active_chains; conf = ieee80211_get_hw_conf(priv->hw); cancel_delayed_work(&priv->scan_check); if (!iwl_is_ready(priv)) { IWL_WARN(priv, "request scan called when driver not ready.\n"); goto done; } /* Make sure the scan wasn't canceled before this queued work * was given the chance to run... */ if (!test_bit(STATUS_SCANNING, &priv->status)) goto done; /* This should never be called or scheduled if there is currently * a scan active in the hardware. */ if (test_bit(STATUS_SCAN_HW, &priv->status)) { IWL_DEBUG_INFO(priv, "Multiple concurrent scan requests in parallel. " "Ignoring second request.\n"); goto done; } if (test_bit(STATUS_EXIT_PENDING, &priv->status)) { IWL_DEBUG_SCAN(priv, "Aborting scan due to device shutdown\n"); goto done; } if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) { IWL_DEBUG_HC(priv, "Scan request while abort pending. Queuing.\n"); goto done; } if (iwl_is_rfkill(priv)) { IWL_DEBUG_HC(priv, "Aborting scan due to RF Kill activation\n"); goto done; } if (!test_bit(STATUS_READY, &priv->status)) { IWL_DEBUG_HC(priv, "Scan request while uninitialized. Queuing.\n"); goto done; } if (!priv->scan_cmd) { priv->scan_cmd = kmalloc(sizeof(struct iwl_scan_cmd) + IWL_MAX_SCAN_SIZE, GFP_KERNEL); if (!priv->scan_cmd) { IWL_DEBUG_SCAN(priv, "fail to allocate memory for scan\n"); goto done; } } scan = priv->scan_cmd; memset(scan, 0, sizeof(struct iwl_scan_cmd) + IWL_MAX_SCAN_SIZE); scan->quiet_plcp_th = IWL_PLCP_QUIET_THRESH; scan->quiet_time = IWL_ACTIVE_QUIET_TIME; if (iwl_is_associated(priv)) { u16 interval = 0; u32 extra; u32 suspend_time = 100; u32 scan_suspend_time = 100; unsigned long flags; IWL_DEBUG_INFO(priv, "Scanning while associated...\n"); spin_lock_irqsave(&priv->lock, flags); interval = priv->beacon_int; spin_unlock_irqrestore(&priv->lock, flags); scan->suspend_time = 0; scan->max_out_time = cpu_to_le32(200 * 1024); if (!interval) interval = suspend_time; extra = (suspend_time / interval) << 22; scan_suspend_time = (extra | ((suspend_time % interval) * 1024)); scan->suspend_time = cpu_to_le32(scan_suspend_time); IWL_DEBUG_SCAN(priv, "suspend_time 0x%X beacon interval %d\n", scan_suspend_time, interval); } if (priv->is_internal_short_scan) { IWL_DEBUG_SCAN(priv, "Start internal passive scan.\n"); } else if (priv->scan_request->n_ssids) { int i, p = 0; IWL_DEBUG_SCAN(priv, "Kicking off active scan\n"); for (i = 0; i < priv->scan_request->n_ssids; i++) { /* always does wildcard anyway */ if (!priv->scan_request->ssids[i].ssid_len) continue; scan->direct_scan[p].id = WLAN_EID_SSID; scan->direct_scan[p].len = priv->scan_request->ssids[i].ssid_len; memcpy(scan->direct_scan[p].ssid, priv->scan_request->ssids[i].ssid, priv->scan_request->ssids[i].ssid_len); n_probes++; p++; } is_active = true; } else IWL_DEBUG_SCAN(priv, "Start passive scan.\n"); scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK; scan->tx_cmd.sta_id = priv->hw_params.bcast_sta_id; scan->tx_cmd.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE; switch (priv->scan_band) { case IEEE80211_BAND_2GHZ: scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK; chan_mod = le32_to_cpu(priv->active_rxon.flags & RXON_FLG_CHANNEL_MODE_MSK) >> RXON_FLG_CHANNEL_MODE_POS; if (chan_mod == CHANNEL_MODE_PURE_40) { rate = IWL_RATE_6M_PLCP; } else { rate = IWL_RATE_1M_PLCP; rate_flags = RATE_MCS_CCK_MSK; } scan->good_CRC_th = 0; break; case IEEE80211_BAND_5GHZ: rate = IWL_RATE_6M_PLCP; /* * If active scaning is requested but a certain channel * is marked passive, we can do active scanning if we * detect transmissions. */ scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH : 0; /* Force use of chains B and C (0x6) for scan Rx * Avoid A (0x1) for the device has off-channel reception * on A-band. */ if (priv->cfg->off_channel_workaround) rx_ant = ANT_BC; break; default: IWL_WARN(priv, "Invalid scan band count\n"); goto done; } band = priv->scan_band; priv->scan_tx_ant[band] = iwl_toggle_tx_ant(priv, priv->scan_tx_ant[band]); rate_flags |= iwl_ant_idx_to_flags(priv->scan_tx_ant[band]); scan->tx_cmd.rate_n_flags = iwl_hw_set_rate_n_flags(rate, rate_flags); /* In power save mode use one chain, otherwise use all chains */ if (test_bit(STATUS_POWER_PMI, &priv->status)) { /* rx_ant has been set to all valid chains previously */ active_chains = rx_ant & ((u8)(priv->chain_noise_data.active_chains)); if (!active_chains) active_chains = rx_ant; IWL_DEBUG_SCAN(priv, "chain_noise_data.active_chains: %u\n", priv->chain_noise_data.active_chains); rx_ant = first_antenna(active_chains); } /* MIMO is not used here, but value is required */ rx_chain |= priv->hw_params.valid_rx_ant << RXON_RX_CHAIN_VALID_POS; rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_MIMO_SEL_POS; rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_SEL_POS; rx_chain |= 0x1 << RXON_RX_CHAIN_DRIVER_FORCE_POS; scan->rx_chain = cpu_to_le16(rx_chain); if (!priv->is_internal_short_scan) { cmd_len = iwl_fill_probe_req(priv, (struct ieee80211_mgmt *)scan->data, priv->scan_request->ie, priv->scan_request->ie_len, IWL_MAX_SCAN_SIZE - sizeof(*scan)); } else { cmd_len = iwl_fill_probe_req(priv, (struct ieee80211_mgmt *)scan->data, NULL, 0, IWL_MAX_SCAN_SIZE - sizeof(*scan)); } scan->tx_cmd.len = cpu_to_le16(cmd_len); scan->filter_flags |= (RXON_FILTER_ACCEPT_GRP_MSK | RXON_FILTER_BCON_AWARE_MSK); if (priv->is_internal_short_scan) { scan->channel_count = iwl_get_single_channel_for_scan(priv, band, (void *)&scan->data[le16_to_cpu( scan->tx_cmd.len)]); } else { scan->channel_count = iwl_get_channels_for_scan(priv, band, is_active, n_probes, (void *)&scan->data[le16_to_cpu( scan->tx_cmd.len)]); } if (scan->channel_count == 0) { IWL_DEBUG_SCAN(priv, "channel count %d\n", scan->channel_count); goto done; } cmd.len += le16_to_cpu(scan->tx_cmd.len) + scan->channel_count * sizeof(struct iwl_scan_channel); cmd.data = scan; scan->len = cpu_to_le16(cmd.len); set_bit(STATUS_SCAN_HW, &priv->status); if (iwl_send_cmd_sync(priv, &cmd)) goto done; queue_delayed_work(priv->workqueue, &priv->scan_check, IWL_SCAN_CHECK_WATCHDOG); return; done: /* Cannot perform scan. Make sure we clear scanning * bits from status so next scan request can be performed. * If we don't clear scanning status bit here all next scan * will fail */ clear_bit(STATUS_SCAN_HW, &priv->status); clear_bit(STATUS_SCANNING, &priv->status); /* inform mac80211 scan aborted */ queue_work(priv->workqueue, &priv->scan_completed); }