From: Tomas Winkler Date: Mon, 5 May 2008 02:22:28 +0000 (+0800) Subject: iwlwifi: move RX code to iwl-rx.c X-Git-Tag: v2.6.27-rc1~969^2~441^2~36 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a55360e458551b0add4ec147ef786d71e163bf50;p=linux-2.6 iwlwifi: move RX code to iwl-rx.c This patch moves partialy rx code into iwl-rx.c as part of iwlcore. The second part of the code can be merged only with moving of tx code as well. Signed-off-by: Tomas Winkler Signed-off-by: John W. Linville --- diff --git a/drivers/net/wireless/iwlwifi/Makefile b/drivers/net/wireless/iwlwifi/Makefile index b0b2b5ebfa..0211a7f714 100644 --- a/drivers/net/wireless/iwlwifi/Makefile +++ b/drivers/net/wireless/iwlwifi/Makefile @@ -1,5 +1,6 @@ obj-$(CONFIG_IWLCORE) += iwlcore.o iwlcore-objs := iwl-core.o iwl-eeprom.o iwl-hcmd.o iwl-power.o +iwlcore-objs += iwl-rx.o iwlcore-$(CONFIG_IWLWIFI_DEBUGFS) += iwl-debugfs.o iwlcore-$(CONFIG_IWLWIFI_LEDS) += iwl-led.o iwlcore-$(CONFIG_IWLWIFI_RFKILL) += iwl-rfkill.o diff --git a/drivers/net/wireless/iwlwifi/iwl-4965.c b/drivers/net/wireless/iwlwifi/iwl-4965.c index 70c0455b62..773bb3229c 100644 --- a/drivers/net/wireless/iwlwifi/iwl-4965.c +++ b/drivers/net/wireless/iwlwifi/iwl-4965.c @@ -372,7 +372,7 @@ int iwl4965_set_pwr_src(struct iwl_priv *priv, enum iwl_pwr_src src) return ret; } -static int iwl4965_rx_init(struct iwl_priv *priv, struct iwl4965_rx_queue *rxq) +static int iwl4965_rx_init(struct iwl_priv *priv, struct iwl_rx_queue *rxq) { int ret; unsigned long flags; @@ -625,7 +625,7 @@ static void iwl4965_nic_config(struct iwl_priv *priv) int iwl4965_hw_nic_init(struct iwl_priv *priv) { unsigned long flags; - struct iwl4965_rx_queue *rxq = &priv->rxq; + struct iwl_rx_queue *rxq = &priv->rxq; int ret; /* nic_init */ @@ -645,22 +645,22 @@ int iwl4965_hw_nic_init(struct iwl_priv *priv) /* Allocate the RX queue, or reset if it is already allocated */ if (!rxq->bd) { - ret = iwl4965_rx_queue_alloc(priv); + ret = iwl_rx_queue_alloc(priv); if (ret) { IWL_ERROR("Unable to initialize Rx queue\n"); return -ENOMEM; } } else - iwl4965_rx_queue_reset(priv, rxq); + iwl_rx_queue_reset(priv, rxq); - iwl4965_rx_replenish(priv); + iwl_rx_replenish(priv); iwl4965_rx_init(priv, rxq); spin_lock_irqsave(&priv->lock, flags); rxq->need_update = 1; - iwl4965_rx_queue_update_write_ptr(priv, rxq); + iwl_rx_queue_update_write_ptr(priv, rxq); spin_unlock_irqrestore(&priv->lock, flags); @@ -2516,7 +2516,8 @@ static void iwl4965_rx_calc_noise(struct iwl_priv *priv) priv->last_rx_noise); } -void iwl4965_hw_rx_statistics(struct iwl_priv *priv, struct iwl4965_rx_mem_buffer *rxb) +void iwl4965_hw_rx_statistics(struct iwl_priv *priv, + struct iwl_rx_mem_buffer *rxb) { struct iwl4965_rx_packet *pkt = (void *)rxb->skb->data; int change; @@ -2803,7 +2804,7 @@ static u32 iwl4965_translate_rx_status(u32 decrypt_in) static void iwl4965_handle_data_packet(struct iwl_priv *priv, int is_data, int include_phy, - struct iwl4965_rx_mem_buffer *rxb, + struct iwl_rx_mem_buffer *rxb, struct ieee80211_rx_status *stats) { struct iwl4965_rx_packet *pkt = (struct iwl4965_rx_packet *)rxb->skb->data; @@ -3109,7 +3110,7 @@ static inline void iwl4965_dbg_report_frame(struct iwl_priv *priv, /* Called for REPLY_RX (legacy ABG frames), or * REPLY_RX_MPDU_CMD (HT high-throughput N frames). */ static void iwl4965_rx_reply_rx(struct iwl_priv *priv, - struct iwl4965_rx_mem_buffer *rxb) + struct iwl_rx_mem_buffer *rxb) { struct ieee80211_hdr *header; struct ieee80211_rx_status rx_status; @@ -3278,7 +3279,7 @@ static void iwl4965_rx_reply_rx(struct iwl_priv *priv, /* Cache phy data (Rx signal strength, etc) for HT frame (REPLY_RX_PHY_CMD). * This will be used later in iwl4965_rx_reply_rx() for REPLY_RX_MPDU_CMD. */ static void iwl4965_rx_reply_rx_phy(struct iwl_priv *priv, - struct iwl4965_rx_mem_buffer *rxb) + struct iwl_rx_mem_buffer *rxb) { struct iwl4965_rx_packet *pkt = (void *)rxb->skb->data; priv->last_phy_res[0] = 1; @@ -3286,7 +3287,7 @@ static void iwl4965_rx_reply_rx_phy(struct iwl_priv *priv, sizeof(struct iwl4965_rx_phy_res)); } static void iwl4965_rx_missed_beacon_notif(struct iwl_priv *priv, - struct iwl4965_rx_mem_buffer *rxb) + struct iwl_rx_mem_buffer *rxb) { #ifdef CONFIG_IWL4965_RUN_TIME_CALIB @@ -3495,7 +3496,7 @@ static inline int iwl4965_queue_dec_wrap(int index, int n_bd) * of frames sent via aggregation. */ static void iwl4965_rx_reply_compressed_ba(struct iwl_priv *priv, - struct iwl4965_rx_mem_buffer *rxb) + struct iwl_rx_mem_buffer *rxb) { struct iwl4965_rx_packet *pkt = (void *)rxb->skb->data; struct iwl4965_compressed_ba_resp *ba_resp = &pkt->u.compressed_ba; diff --git a/drivers/net/wireless/iwlwifi/iwl-core.h b/drivers/net/wireless/iwlwifi/iwl-core.h index 369f182158..2356cadc1d 100644 --- a/drivers/net/wireless/iwlwifi/iwl-core.h +++ b/drivers/net/wireless/iwlwifi/iwl-core.h @@ -173,6 +173,21 @@ int iwl_set_rxon_channel(struct iwl_priv *priv, void iwlcore_free_geos(struct iwl_priv *priv); int iwl_setup(struct iwl_priv *priv); +/***************************************************** +* RX +******************************************************/ +void iwl_rx_queue_free(struct iwl_priv *priv, struct iwl_rx_queue *rxq); +int iwl_rx_queue_alloc(struct iwl_priv *priv); +void iwl_rx_handle(struct iwl_priv *priv); +int iwl_rx_queue_update_write_ptr(struct iwl_priv *priv, + struct iwl_rx_queue *q); +void iwl_rx_queue_reset(struct iwl_priv *priv, struct iwl_rx_queue *rxq); +void iwl_rx_replenish(struct iwl_priv *priv); +/* FIXME: remove when TX is moved to iwl core */ +int iwl_rx_queue_restock(struct iwl_priv *priv); +int iwl_rx_queue_space(const struct iwl_rx_queue *q); +void iwl_rx_allocate(struct iwl_priv *priv); + /***************************************************** * S e n d i n g H o s t C o m m a n d s * *****************************************************/ @@ -265,4 +280,5 @@ static inline int iwl_send_rxon_assoc(struct iwl_priv *priv) return priv->cfg->ops->hcmd->rxon_assoc(priv); } + #endif /* __iwl_core_h__ */ diff --git a/drivers/net/wireless/iwlwifi/iwl-dev.h b/drivers/net/wireless/iwlwifi/iwl-dev.h index 78aba21bc1..1d80ad7911 100644 --- a/drivers/net/wireless/iwlwifi/iwl-dev.h +++ b/drivers/net/wireless/iwlwifi/iwl-dev.h @@ -91,7 +91,7 @@ extern struct iwl_cfg iwl5350_agn_cfg; #define DEFAULT_SHORT_RETRY_LIMIT 7U #define DEFAULT_LONG_RETRY_LIMIT 4U -struct iwl4965_rx_mem_buffer { +struct iwl_rx_mem_buffer { dma_addr_t dma_addr; struct sk_buff *skb; struct list_head list; @@ -358,7 +358,7 @@ struct iwl_host_cmd { #define SUP_RATE_11G_MAX_NUM_CHANNELS 12 /** - * struct iwl4965_rx_queue - Rx queue + * struct iwl_rx_queue - Rx queue * @processed: Internal index to last handled Rx packet * @read: Shared index to newest available Rx buffer * @write: Shared index to oldest written Rx packet @@ -367,13 +367,13 @@ struct iwl_host_cmd { * @rx_used: List of Rx buffers with no SKB * @need_update: flag to indicate we need to update read/write index * - * NOTE: rx_free and rx_used are used as a FIFO for iwl4965_rx_mem_buffers + * NOTE: rx_free and rx_used are used as a FIFO for iwl_rx_mem_buffers */ -struct iwl4965_rx_queue { +struct iwl_rx_queue { __le32 *bd; dma_addr_t dma_addr; - struct iwl4965_rx_mem_buffer pool[RX_QUEUE_SIZE + RX_FREE_BUFFERS]; - struct iwl4965_rx_mem_buffer *queue[RX_QUEUE_SIZE]; + struct iwl_rx_mem_buffer pool[RX_QUEUE_SIZE + RX_FREE_BUFFERS]; + struct iwl_rx_mem_buffer *queue[RX_QUEUE_SIZE]; u32 processed; u32 read; u32 write; @@ -643,26 +643,20 @@ extern int iwl4965_is_network_packet(struct iwl_priv *priv, struct ieee80211_hdr *header); extern int iwl4965_power_init_handle(struct iwl_priv *priv); extern void iwl4965_handle_data_packet_monitor(struct iwl_priv *priv, - struct iwl4965_rx_mem_buffer *rxb, + struct iwl_rx_mem_buffer *rxb, void *data, short len, struct ieee80211_rx_status *stats, u16 phy_flags); extern int iwl4965_is_duplicate_packet(struct iwl_priv *priv, struct ieee80211_hdr *header); -extern int iwl4965_rx_queue_alloc(struct iwl_priv *priv); -extern void iwl4965_rx_queue_reset(struct iwl_priv *priv, - struct iwl4965_rx_queue *rxq); extern int iwl4965_calc_db_from_ratio(int sig_ratio); extern int iwl4965_calc_sig_qual(int rssi_dbm, int noise_dbm); extern int iwl4965_tx_queue_init(struct iwl_priv *priv, struct iwl4965_tx_queue *txq, int count, u32 id); -extern void iwl4965_rx_replenish(void *data); extern void iwl4965_tx_queue_free(struct iwl_priv *priv, struct iwl4965_tx_queue *txq); extern unsigned int iwl4965_fill_beacon_frame(struct iwl_priv *priv, struct ieee80211_hdr *hdr, const u8 *dest, int left); -extern int iwl4965_rx_queue_update_write_ptr(struct iwl_priv *priv, - struct iwl4965_rx_queue *q); extern __le16 *ieee80211_get_qos_ctrl(struct ieee80211_hdr *hdr); extern void iwl4965_update_chain_flags(struct iwl_priv *priv); int iwl4965_set_pwr_src(struct iwl_priv *priv, enum iwl_pwr_src src); @@ -722,7 +716,7 @@ extern void iwl4965_hw_build_tx_cmd_rate(struct iwl_priv *priv, extern int iwl4965_hw_reg_send_txpower(struct iwl_priv *priv); extern int iwl4965_hw_reg_set_txpower(struct iwl_priv *priv, s8 power); extern void iwl4965_hw_rx_statistics(struct iwl_priv *priv, - struct iwl4965_rx_mem_buffer *rxb); + struct iwl_rx_mem_buffer *rxb); extern void iwl4965_disable_events(struct iwl_priv *priv); extern int iwl4965_get_temperature(const struct iwl_priv *priv); @@ -960,7 +954,7 @@ struct iwl_priv { bool add_radiotap; void (*rx_handlers[REPLY_MAX])(struct iwl_priv *priv, - struct iwl4965_rx_mem_buffer *rxb); + struct iwl_rx_mem_buffer *rxb); struct ieee80211_supported_band bands[IEEE80211_NUM_BANDS]; @@ -1077,7 +1071,7 @@ struct iwl_priv { int activity_timer_active; /* Rx and Tx DMA processing queues */ - struct iwl4965_rx_queue rxq; + struct iwl_rx_queue rxq; struct iwl4965_tx_queue txq[IWL_MAX_NUM_QUEUES]; unsigned long txq_ctx_active_msk; struct iwl4965_kw kw; /* keep warm address */ diff --git a/drivers/net/wireless/iwlwifi/iwl-rx.c b/drivers/net/wireless/iwlwifi/iwl-rx.c new file mode 100644 index 0000000000..667b592e6a --- /dev/null +++ b/drivers/net/wireless/iwlwifi/iwl-rx.c @@ -0,0 +1,371 @@ +/****************************************************************************** + * + * 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 "iwl-eeprom.h" +#include "iwl-dev.h" +#include "iwl-core.h" +#include "iwl-sta.h" +#include "iwl-io.h" +#include "iwl-helpers.h" +/************************** RX-FUNCTIONS ****************************/ +/* + * Rx theory of operation + * + * Driver allocates a circular buffer of Receive Buffer Descriptors (RBDs), + * each of which point to Receive Buffers to be filled by the NIC. These get + * used not only for Rx frames, but for any command response or notification + * from the NIC. The driver and NIC manage the Rx buffers by means + * of indexes into the circular buffer. + * + * Rx Queue Indexes + * The host/firmware share two index registers for managing the Rx buffers. + * + * The READ index maps to the first position that the firmware may be writing + * to -- the driver can read up to (but not including) this position and get + * good data. + * The READ index is managed by the firmware once the card is enabled. + * + * The WRITE index maps to the last position the driver has read from -- the + * position preceding WRITE is the last slot the firmware can place a packet. + * + * The queue is empty (no good data) if WRITE = READ - 1, and is full if + * WRITE = READ. + * + * During initialization, the host sets up the READ queue position to the first + * INDEX position, and WRITE to the last (READ - 1 wrapped) + * + * When the firmware places a packet in a buffer, it will advance the READ index + * and fire the RX interrupt. The driver can then query the READ index and + * process as many packets as possible, moving the WRITE index forward as it + * resets the Rx queue buffers with new memory. + * + * The management in the driver is as follows: + * + A list of pre-allocated SKBs is stored in iwl->rxq->rx_free. When + * iwl->rxq->free_count drops to or below RX_LOW_WATERMARK, work is scheduled + * to replenish the iwl->rxq->rx_free. + * + In iwl_rx_replenish (scheduled) if 'processed' != 'read' then the + * iwl->rxq is replenished and the READ INDEX is updated (updating the + * 'processed' and 'read' driver indexes as well) + * + A received packet is processed and handed to the kernel network stack, + * detached from the iwl->rxq. The driver 'processed' index is updated. + * + The Host/Firmware iwl->rxq is replenished at tasklet time from the rx_free + * list. If there are no allocated buffers in iwl->rxq->rx_free, the READ + * INDEX is not incremented and iwl->status(RX_STALLED) is set. If there + * were enough free buffers and RX_STALLED is set it is cleared. + * + * + * Driver sequence: + * + * iwl_rx_queue_alloc() Allocates rx_free + * iwl_rx_replenish() Replenishes rx_free list from rx_used, and calls + * iwl_rx_queue_restock + * iwl_rx_queue_restock() Moves available buffers from rx_free into Rx + * queue, updates firmware pointers, and updates + * the WRITE index. If insufficient rx_free buffers + * are available, schedules iwl_rx_replenish + * + * -- enable interrupts -- + * ISR - iwl_rx() Detach iwl_rx_mem_buffers from pool up to the + * READ INDEX, detaching the SKB from the pool. + * Moves the packet buffer from queue to rx_used. + * Calls iwl_rx_queue_restock to refill any empty + * slots. + * ... + * + */ + +/** + * iwl_rx_queue_space - Return number of free slots available in queue. + */ +int iwl_rx_queue_space(const struct iwl_rx_queue *q) +{ + int s = q->read - q->write; + if (s <= 0) + s += RX_QUEUE_SIZE; + /* keep some buffer to not confuse full and empty queue */ + s -= 2; + if (s < 0) + s = 0; + return s; +} +EXPORT_SYMBOL(iwl_rx_queue_space); + +/** + * iwl_rx_queue_update_write_ptr - Update the write pointer for the RX queue + */ +int iwl_rx_queue_update_write_ptr(struct iwl_priv *priv, struct iwl_rx_queue *q) +{ + u32 reg = 0; + int ret = 0; + unsigned long flags; + + spin_lock_irqsave(&q->lock, flags); + + if (q->need_update == 0) + goto exit_unlock; + + /* If power-saving is in use, make sure device is awake */ + if (test_bit(STATUS_POWER_PMI, &priv->status)) { + reg = iwl_read32(priv, CSR_UCODE_DRV_GP1); + + if (reg & CSR_UCODE_DRV_GP1_BIT_MAC_SLEEP) { + iwl_set_bit(priv, CSR_GP_CNTRL, + CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ); + goto exit_unlock; + } + + ret = iwl_grab_nic_access(priv); + if (ret) + goto exit_unlock; + + /* Device expects a multiple of 8 */ + iwl_write_direct32(priv, FH_RSCSR_CHNL0_WPTR, + q->write & ~0x7); + iwl_release_nic_access(priv); + + /* Else device is assumed to be awake */ + } else + /* Device expects a multiple of 8 */ + iwl_write32(priv, FH_RSCSR_CHNL0_WPTR, q->write & ~0x7); + + + q->need_update = 0; + + exit_unlock: + spin_unlock_irqrestore(&q->lock, flags); + return ret; +} +EXPORT_SYMBOL(iwl_rx_queue_update_write_ptr); +/** + * iwl_dma_addr2rbd_ptr - convert a DMA address to a uCode read buffer ptr + */ +static inline __le32 iwl_dma_addr2rbd_ptr(struct iwl_priv *priv, + dma_addr_t dma_addr) +{ + return cpu_to_le32((u32)(dma_addr >> 8)); +} + +/** + * iwl_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. + */ +int iwl_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; + int write; + int ret = 0; + + spin_lock_irqsave(&rxq->lock, flags); + write = rxq->write & ~0x7; + while ((iwl_rx_queue_space(rxq) > 0) && (rxq->free_count)) { + /* 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] = iwl_dma_addr2rbd_ptr(priv, rxb->dma_addr); + 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 ((write != (rxq->write & ~0x7)) + || (abs(rxq->write - rxq->read) > 7)) { + spin_lock_irqsave(&rxq->lock, flags); + rxq->need_update = 1; + spin_unlock_irqrestore(&rxq->lock, flags); + ret = iwl_rx_queue_update_write_ptr(priv, rxq); + } + + return ret; +} +EXPORT_SYMBOL(iwl_rx_queue_restock); + + +/** + * iwl_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 iwl_rx_allocate(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 (!list_empty(&rxq->rx_used)) { + element = rxq->rx_used.next; + rxb = list_entry(element, struct iwl_rx_mem_buffer, list); + + /* Alloc a new receive buffer */ + rxb->skb = alloc_skb(priv->hw_params.rx_buf_size, + __GFP_NOWARN | GFP_ATOMIC); + if (!rxb->skb) { + if (net_ratelimit()) + printk(KERN_CRIT DRV_NAME + ": Can not allocate SKB buffers\n"); + /* We don't reschedule replenish work here -- we will + * call the restock method and if it still needs + * more buffers it will schedule replenish */ + break; + } + priv->alloc_rxb_skb++; + list_del(element); + + /* Get physical address of RB/SKB */ + rxb->dma_addr = + pci_map_single(priv->pci_dev, rxb->skb->data, + priv->hw_params.rx_buf_size, PCI_DMA_FROMDEVICE); + list_add_tail(&rxb->list, &rxq->rx_free); + rxq->free_count++; + } + spin_unlock_irqrestore(&rxq->lock, flags); +} +EXPORT_SYMBOL(iwl_rx_allocate); + +void iwl_rx_replenish(struct iwl_priv *priv) +{ + unsigned long flags; + + iwl_rx_allocate(priv); + + spin_lock_irqsave(&priv->lock, flags); + iwl_rx_queue_restock(priv); + spin_unlock_irqrestore(&priv->lock, flags); +} +EXPORT_SYMBOL(iwl_rx_replenish); + + +/* 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 iwl_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].skb != NULL) { + pci_unmap_single(priv->pci_dev, + rxq->pool[i].dma_addr, + priv->hw_params.rx_buf_size, + PCI_DMA_FROMDEVICE); + dev_kfree_skb(rxq->pool[i].skb); + } + } + + pci_free_consistent(priv->pci_dev, 4 * RX_QUEUE_SIZE, rxq->bd, + rxq->dma_addr); + rxq->bd = NULL; +} +EXPORT_SYMBOL(iwl_rx_queue_free); + +int iwl_rx_queue_alloc(struct iwl_priv *priv) +{ + struct iwl_rx_queue *rxq = &priv->rxq; + struct pci_dev *dev = priv->pci_dev; + int i; + + spin_lock_init(&rxq->lock); + INIT_LIST_HEAD(&rxq->rx_free); + INIT_LIST_HEAD(&rxq->rx_used); + + /* Alloc the circular buffer of Read Buffer Descriptors (RBDs) */ + rxq->bd = pci_alloc_consistent(dev, 4 * RX_QUEUE_SIZE, &rxq->dma_addr); + if (!rxq->bd) + return -ENOMEM; + + /* Fill the rx_used queue with _all_ of the Rx buffers */ + for (i = 0; i < RX_FREE_BUFFERS + RX_QUEUE_SIZE; i++) + list_add_tail(&rxq->pool[i].list, &rxq->rx_used); + + /* 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->free_count = 0; + rxq->need_update = 0; + return 0; +} +EXPORT_SYMBOL(iwl_rx_queue_alloc); + +void iwl_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].skb != NULL) { + pci_unmap_single(priv->pci_dev, + rxq->pool[i].dma_addr, + priv->hw_params.rx_buf_size, + PCI_DMA_FROMDEVICE); + priv->alloc_rxb_skb--; + dev_kfree_skb(rxq->pool[i].skb); + rxq->pool[i].skb = NULL; + } + list_add_tail(&rxq->pool[i].list, &rxq->rx_used); + } + + /* 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->free_count = 0; + spin_unlock_irqrestore(&rxq->lock, flags); +} +EXPORT_SYMBOL(iwl_rx_queue_reset); + diff --git a/drivers/net/wireless/iwlwifi/iwl4965-base.c b/drivers/net/wireless/iwlwifi/iwl4965-base.c index 54534270d4..aa0393589d 100644 --- a/drivers/net/wireless/iwlwifi/iwl4965-base.c +++ b/drivers/net/wireless/iwlwifi/iwl4965-base.c @@ -2736,7 +2736,7 @@ static int iwl4965_tx_status_reply_tx(struct iwl_priv *priv, * iwl4965_rx_reply_tx - Handle standard (non-aggregation) Tx response */ static void iwl4965_rx_reply_tx(struct iwl_priv *priv, - struct iwl4965_rx_mem_buffer *rxb) + struct iwl_rx_mem_buffer *rxb) { struct iwl4965_rx_packet *pkt = (void *)rxb->skb->data; u16 sequence = le16_to_cpu(pkt->hdr.sequence); @@ -2849,7 +2849,7 @@ static void iwl4965_rx_reply_tx(struct iwl_priv *priv, static void iwl4965_rx_reply_alive(struct iwl_priv *priv, - struct iwl4965_rx_mem_buffer *rxb) + struct iwl_rx_mem_buffer *rxb) { struct iwl4965_rx_packet *pkt = (void *)rxb->skb->data; struct iwl4965_alive_resp *palive; @@ -2885,7 +2885,7 @@ static void iwl4965_rx_reply_alive(struct iwl_priv *priv, } static void iwl4965_rx_reply_add_sta(struct iwl_priv *priv, - struct iwl4965_rx_mem_buffer *rxb) + struct iwl_rx_mem_buffer *rxb) { struct iwl4965_rx_packet *pkt = (void *)rxb->skb->data; @@ -2894,7 +2894,7 @@ static void iwl4965_rx_reply_add_sta(struct iwl_priv *priv, } static void iwl4965_rx_reply_error(struct iwl_priv *priv, - struct iwl4965_rx_mem_buffer *rxb) + struct iwl_rx_mem_buffer *rxb) { struct iwl4965_rx_packet *pkt = (void *)rxb->skb->data; @@ -2909,7 +2909,7 @@ static void iwl4965_rx_reply_error(struct iwl_priv *priv, #define TX_STATUS_ENTRY(x) case TX_STATUS_FAIL_ ## x: return #x -static void iwl4965_rx_csa(struct iwl_priv *priv, struct iwl4965_rx_mem_buffer *rxb) +static void iwl4965_rx_csa(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb) { struct iwl4965_rx_packet *pkt = (void *)rxb->skb->data; struct iwl4965_rxon_cmd *rxon = (void *)&priv->active_rxon; @@ -2921,7 +2921,7 @@ static void iwl4965_rx_csa(struct iwl_priv *priv, struct iwl4965_rx_mem_buffer * } static void iwl4965_rx_spectrum_measure_notif(struct iwl_priv *priv, - struct iwl4965_rx_mem_buffer *rxb) + struct iwl_rx_mem_buffer *rxb) { #ifdef CONFIG_IWL4965_SPECTRUM_MEASUREMENT struct iwl4965_rx_packet *pkt = (void *)rxb->skb->data; @@ -2939,7 +2939,7 @@ static void iwl4965_rx_spectrum_measure_notif(struct iwl_priv *priv, } static void iwl4965_rx_pm_sleep_notif(struct iwl_priv *priv, - struct iwl4965_rx_mem_buffer *rxb) + struct iwl_rx_mem_buffer *rxb) { #ifdef CONFIG_IWLWIFI_DEBUG struct iwl4965_rx_packet *pkt = (void *)rxb->skb->data; @@ -2950,7 +2950,7 @@ static void iwl4965_rx_pm_sleep_notif(struct iwl_priv *priv, } static void iwl4965_rx_pm_debug_statistics_notif(struct iwl_priv *priv, - struct iwl4965_rx_mem_buffer *rxb) + struct iwl_rx_mem_buffer *rxb) { struct iwl4965_rx_packet *pkt = (void *)rxb->skb->data; IWL_DEBUG_RADIO("Dumping %d bytes of unhandled " @@ -2985,7 +2985,7 @@ static void iwl4965_bg_beacon_update(struct work_struct *work) } static void iwl4965_rx_beacon_notif(struct iwl_priv *priv, - struct iwl4965_rx_mem_buffer *rxb) + struct iwl_rx_mem_buffer *rxb) { #ifdef CONFIG_IWLWIFI_DEBUG struct iwl4965_rx_packet *pkt = (void *)rxb->skb->data; @@ -3008,7 +3008,7 @@ static void iwl4965_rx_beacon_notif(struct iwl_priv *priv, /* Service response to REPLY_SCAN_CMD (0x80) */ static void iwl4965_rx_reply_scan(struct iwl_priv *priv, - struct iwl4965_rx_mem_buffer *rxb) + struct iwl_rx_mem_buffer *rxb) { #ifdef CONFIG_IWLWIFI_DEBUG struct iwl4965_rx_packet *pkt = (void *)rxb->skb->data; @@ -3021,7 +3021,7 @@ static void iwl4965_rx_reply_scan(struct iwl_priv *priv, /* Service SCAN_START_NOTIFICATION (0x82) */ static void iwl4965_rx_scan_start_notif(struct iwl_priv *priv, - struct iwl4965_rx_mem_buffer *rxb) + struct iwl_rx_mem_buffer *rxb) { struct iwl4965_rx_packet *pkt = (void *)rxb->skb->data; struct iwl4965_scanstart_notification *notif = @@ -3038,7 +3038,7 @@ static void iwl4965_rx_scan_start_notif(struct iwl_priv *priv, /* Service SCAN_RESULTS_NOTIFICATION (0x83) */ static void iwl4965_rx_scan_results_notif(struct iwl_priv *priv, - struct iwl4965_rx_mem_buffer *rxb) + struct iwl_rx_mem_buffer *rxb) { struct iwl4965_rx_packet *pkt = (void *)rxb->skb->data; struct iwl4965_scanresults_notification *notif = @@ -3063,7 +3063,7 @@ static void iwl4965_rx_scan_results_notif(struct iwl_priv *priv, /* Service SCAN_COMPLETE_NOTIFICATION (0x84) */ static void iwl4965_rx_scan_complete_notif(struct iwl_priv *priv, - struct iwl4965_rx_mem_buffer *rxb) + struct iwl_rx_mem_buffer *rxb) { struct iwl4965_rx_packet *pkt = (void *)rxb->skb->data; struct iwl4965_scancomplete_notification *scan_notif = (void *)pkt->u.raw; @@ -3121,7 +3121,7 @@ reschedule: /* Handle notification from uCode that card's power state is changing * due to software, hardware, or critical temperature RFKILL */ static void iwl4965_rx_card_state_notif(struct iwl_priv *priv, - struct iwl4965_rx_mem_buffer *rxb) + struct iwl_rx_mem_buffer *rxb) { struct iwl4965_rx_packet *pkt = (void *)rxb->skb->data; u32 flags = le32_to_cpu(pkt->u.card_state_notif.flags); @@ -3241,7 +3241,7 @@ static void iwl4965_setup_rx_handlers(struct iwl_priv *priv) * if the callback returns 1 */ static void iwl4965_tx_cmd_complete(struct iwl_priv *priv, - struct iwl4965_rx_mem_buffer *rxb) + struct iwl_rx_mem_buffer *rxb) { struct iwl4965_rx_packet *pkt = (struct iwl4965_rx_packet *)rxb->skb->data; u16 sequence = le16_to_cpu(pkt->hdr.sequence); @@ -3278,438 +3278,28 @@ static void iwl4965_tx_cmd_complete(struct iwl_priv *priv, } } -/************************** RX-FUNCTIONS ****************************/ -/* - * Rx theory of operation - * - * Driver allocates a circular buffer of Receive Buffer Descriptors (RBDs), - * each of which point to Receive Buffers to be filled by 4965. These get - * used not only for Rx frames, but for any command response or notification - * from the 4965. The driver and 4965 manage the Rx buffers by means - * of indexes into the circular buffer. - * - * Rx Queue Indexes - * The host/firmware share two index registers for managing the Rx buffers. - * - * The READ index maps to the first position that the firmware may be writing - * to -- the driver can read up to (but not including) this position and get - * good data. - * The READ index is managed by the firmware once the card is enabled. - * - * The WRITE index maps to the last position the driver has read from -- the - * position preceding WRITE is the last slot the firmware can place a packet. - * - * The queue is empty (no good data) if WRITE = READ - 1, and is full if - * WRITE = READ. - * - * During initialization, the host sets up the READ queue position to the first - * INDEX position, and WRITE to the last (READ - 1 wrapped) - * - * When the firmware places a packet in a buffer, it will advance the READ index - * and fire the RX interrupt. The driver can then query the READ index and - * process as many packets as possible, moving the WRITE index forward as it - * resets the Rx queue buffers with new memory. - * - * The management in the driver is as follows: - * + A list of pre-allocated SKBs is stored in iwl->rxq->rx_free. When - * iwl->rxq->free_count drops to or below RX_LOW_WATERMARK, work is scheduled - * to replenish the iwl->rxq->rx_free. - * + In iwl4965_rx_replenish (scheduled) if 'processed' != 'read' then the - * iwl->rxq is replenished and the READ INDEX is updated (updating the - * 'processed' and 'read' driver indexes as well) - * + A received packet is processed and handed to the kernel network stack, - * detached from the iwl->rxq. The driver 'processed' index is updated. - * + The Host/Firmware iwl->rxq is replenished at tasklet time from the rx_free - * list. If there are no allocated buffers in iwl->rxq->rx_free, the READ - * INDEX is not incremented and iwl->status(RX_STALLED) is set. If there - * were enough free buffers and RX_STALLED is set it is cleared. - * - * - * Driver sequence: - * - * iwl4965_rx_queue_alloc() Allocates rx_free - * iwl4965_rx_replenish() Replenishes rx_free list from rx_used, and calls - * iwl4965_rx_queue_restock - * iwl4965_rx_queue_restock() Moves available buffers from rx_free into Rx - * queue, updates firmware pointers, and updates - * the WRITE index. If insufficient rx_free buffers - * are available, schedules iwl4965_rx_replenish - * - * -- enable interrupts -- - * ISR - iwl4965_rx() Detach iwl4965_rx_mem_buffers from pool up to the - * READ INDEX, detaching the SKB from the pool. - * Moves the packet buffer from queue to rx_used. - * Calls iwl4965_rx_queue_restock to refill any empty - * slots. - * ... - * - */ - -/** - * iwl4965_rx_queue_space - Return number of free slots available in queue. - */ -static int iwl4965_rx_queue_space(const struct iwl4965_rx_queue *q) -{ - int s = q->read - q->write; - if (s <= 0) - s += RX_QUEUE_SIZE; - /* keep some buffer to not confuse full and empty queue */ - s -= 2; - if (s < 0) - s = 0; - return s; -} - -/** - * iwl4965_rx_queue_update_write_ptr - Update the write pointer for the RX queue - */ -int iwl4965_rx_queue_update_write_ptr(struct iwl_priv *priv, struct iwl4965_rx_queue *q) -{ - u32 reg = 0; - int rc = 0; - unsigned long flags; - - spin_lock_irqsave(&q->lock, flags); - - if (q->need_update == 0) - goto exit_unlock; - - /* If power-saving is in use, make sure device is awake */ - if (test_bit(STATUS_POWER_PMI, &priv->status)) { - reg = iwl_read32(priv, CSR_UCODE_DRV_GP1); - - if (reg & CSR_UCODE_DRV_GP1_BIT_MAC_SLEEP) { - iwl_set_bit(priv, CSR_GP_CNTRL, - CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ); - goto exit_unlock; - } - - rc = iwl_grab_nic_access(priv); - if (rc) - goto exit_unlock; - - /* Device expects a multiple of 8 */ - iwl_write_direct32(priv, FH_RSCSR_CHNL0_WPTR, - q->write & ~0x7); - iwl_release_nic_access(priv); - - /* Else device is assumed to be awake */ - } else - /* Device expects a multiple of 8 */ - iwl_write32(priv, FH_RSCSR_CHNL0_WPTR, q->write & ~0x7); - - - q->need_update = 0; - - exit_unlock: - spin_unlock_irqrestore(&q->lock, flags); - return rc; -} - -/** - * iwl4965_dma_addr2rbd_ptr - convert a DMA address to a uCode read buffer ptr - */ -static inline __le32 iwl4965_dma_addr2rbd_ptr(struct iwl_priv *priv, - dma_addr_t dma_addr) -{ - return cpu_to_le32((u32)(dma_addr >> 8)); -} - - -/** - * iwl4965_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. - */ -static int iwl4965_rx_queue_restock(struct iwl_priv *priv) -{ - struct iwl4965_rx_queue *rxq = &priv->rxq; - struct list_head *element; - struct iwl4965_rx_mem_buffer *rxb; - unsigned long flags; - int write, rc; - - spin_lock_irqsave(&rxq->lock, flags); - write = rxq->write & ~0x7; - while ((iwl4965_rx_queue_space(rxq) > 0) && (rxq->free_count)) { - /* Get next free Rx buffer, remove from free list */ - element = rxq->rx_free.next; - rxb = list_entry(element, struct iwl4965_rx_mem_buffer, list); - list_del(element); - - /* Point to Rx buffer via next RBD in circular buffer */ - rxq->bd[rxq->write] = iwl4965_dma_addr2rbd_ptr(priv, rxb->dma_addr); - 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 ((write != (rxq->write & ~0x7)) - || (abs(rxq->write - rxq->read) > 7)) { - spin_lock_irqsave(&rxq->lock, flags); - rxq->need_update = 1; - spin_unlock_irqrestore(&rxq->lock, flags); - rc = iwl4965_rx_queue_update_write_ptr(priv, rxq); - if (rc) - return rc; - } - - return 0; -} - -/** - * iwl4965_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 iwl4965_rx_queue_restock. - * This is called as a scheduled work item (except for during initialization) - */ -static void iwl4965_rx_allocate(struct iwl_priv *priv) -{ - struct iwl4965_rx_queue *rxq = &priv->rxq; - struct list_head *element; - struct iwl4965_rx_mem_buffer *rxb; - unsigned long flags; - spin_lock_irqsave(&rxq->lock, flags); - while (!list_empty(&rxq->rx_used)) { - element = rxq->rx_used.next; - rxb = list_entry(element, struct iwl4965_rx_mem_buffer, list); - - /* Alloc a new receive buffer */ - rxb->skb = - alloc_skb(priv->hw_params.rx_buf_size, - __GFP_NOWARN | GFP_ATOMIC); - if (!rxb->skb) { - if (net_ratelimit()) - printk(KERN_CRIT DRV_NAME - ": Can not allocate SKB buffers\n"); - /* We don't reschedule replenish work here -- we will - * call the restock method and if it still needs - * more buffers it will schedule replenish */ - break; - } - priv->alloc_rxb_skb++; - list_del(element); - - /* Get physical address of RB/SKB */ - rxb->dma_addr = - pci_map_single(priv->pci_dev, rxb->skb->data, - priv->hw_params.rx_buf_size, PCI_DMA_FROMDEVICE); - list_add_tail(&rxb->list, &rxq->rx_free); - rxq->free_count++; - } - spin_unlock_irqrestore(&rxq->lock, flags); -} - /* * this should be called while priv->lock is locked */ -static void __iwl4965_rx_replenish(void *data) -{ - struct iwl_priv *priv = data; - - iwl4965_rx_allocate(priv); - iwl4965_rx_queue_restock(priv); -} - - -void iwl4965_rx_replenish(void *data) -{ - struct iwl_priv *priv = data; - unsigned long flags; - - iwl4965_rx_allocate(priv); - - spin_lock_irqsave(&priv->lock, flags); - iwl4965_rx_queue_restock(priv); - spin_unlock_irqrestore(&priv->lock, flags); -} - -/* 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 - */ -static void iwl4965_rx_queue_free(struct iwl_priv *priv, struct iwl4965_rx_queue *rxq) -{ - int i; - for (i = 0; i < RX_QUEUE_SIZE + RX_FREE_BUFFERS; i++) { - if (rxq->pool[i].skb != NULL) { - pci_unmap_single(priv->pci_dev, - rxq->pool[i].dma_addr, - priv->hw_params.rx_buf_size, - PCI_DMA_FROMDEVICE); - dev_kfree_skb(rxq->pool[i].skb); - } - } - - pci_free_consistent(priv->pci_dev, 4 * RX_QUEUE_SIZE, rxq->bd, - rxq->dma_addr); - rxq->bd = NULL; -} - -int iwl4965_rx_queue_alloc(struct iwl_priv *priv) -{ - struct iwl4965_rx_queue *rxq = &priv->rxq; - struct pci_dev *dev = priv->pci_dev; - int i; - - spin_lock_init(&rxq->lock); - INIT_LIST_HEAD(&rxq->rx_free); - INIT_LIST_HEAD(&rxq->rx_used); - - /* Alloc the circular buffer of Read Buffer Descriptors (RBDs) */ - rxq->bd = pci_alloc_consistent(dev, 4 * RX_QUEUE_SIZE, &rxq->dma_addr); - if (!rxq->bd) - return -ENOMEM; - - /* Fill the rx_used queue with _all_ of the Rx buffers */ - for (i = 0; i < RX_FREE_BUFFERS + RX_QUEUE_SIZE; i++) - list_add_tail(&rxq->pool[i].list, &rxq->rx_used); - - /* 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->free_count = 0; - rxq->need_update = 0; - return 0; -} - -void iwl4965_rx_queue_reset(struct iwl_priv *priv, struct iwl4965_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].skb != NULL) { - pci_unmap_single(priv->pci_dev, - rxq->pool[i].dma_addr, - priv->hw_params.rx_buf_size, - PCI_DMA_FROMDEVICE); - priv->alloc_rxb_skb--; - dev_kfree_skb(rxq->pool[i].skb); - rxq->pool[i].skb = NULL; - } - list_add_tail(&rxq->pool[i].list, &rxq->rx_used); - } - - /* 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->free_count = 0; - spin_unlock_irqrestore(&rxq->lock, flags); -} - -/* Convert linear signal-to-noise ratio into dB */ -static u8 ratio2dB[100] = { -/* 0 1 2 3 4 5 6 7 8 9 */ - 0, 0, 6, 10, 12, 14, 16, 17, 18, 19, /* 00 - 09 */ - 20, 21, 22, 22, 23, 23, 24, 25, 26, 26, /* 10 - 19 */ - 26, 26, 26, 27, 27, 28, 28, 28, 29, 29, /* 20 - 29 */ - 29, 30, 30, 30, 31, 31, 31, 31, 32, 32, /* 30 - 39 */ - 32, 32, 32, 33, 33, 33, 33, 33, 34, 34, /* 40 - 49 */ - 34, 34, 34, 34, 35, 35, 35, 35, 35, 35, /* 50 - 59 */ - 36, 36, 36, 36, 36, 36, 36, 37, 37, 37, /* 60 - 69 */ - 37, 37, 37, 37, 37, 38, 38, 38, 38, 38, /* 70 - 79 */ - 38, 38, 38, 38, 38, 39, 39, 39, 39, 39, /* 80 - 89 */ - 39, 39, 39, 39, 39, 40, 40, 40, 40, 40 /* 90 - 99 */ -}; - -/* Calculates a relative dB value from a ratio of linear - * (i.e. not dB) signal levels. - * Conversion assumes that levels are voltages (20*log), not powers (10*log). */ -int iwl4965_calc_db_from_ratio(int sig_ratio) +static void __iwl_rx_replenish(struct iwl_priv *priv) { - /* 1000:1 or higher just report as 60 dB */ - if (sig_ratio >= 1000) - return 60; - - /* 100:1 or higher, divide by 10 and use table, - * add 20 dB to make up for divide by 10 */ - if (sig_ratio >= 100) - return (20 + (int)ratio2dB[sig_ratio/10]); - - /* We shouldn't see this */ - if (sig_ratio < 1) - return 0; - - /* Use table for ratios 1:1 - 99:1 */ - return (int)ratio2dB[sig_ratio]; + iwl_rx_allocate(priv); + iwl_rx_queue_restock(priv); } -#define PERFECT_RSSI (-20) /* dBm */ -#define WORST_RSSI (-95) /* dBm */ -#define RSSI_RANGE (PERFECT_RSSI - WORST_RSSI) - -/* Calculate an indication of rx signal quality (a percentage, not dBm!). - * See http://www.ces.clemson.edu/linux/signal_quality.shtml for info - * about formulas used below. */ -int iwl4965_calc_sig_qual(int rssi_dbm, int noise_dbm) -{ - int sig_qual; - int degradation = PERFECT_RSSI - rssi_dbm; - - /* If we get a noise measurement, use signal-to-noise ratio (SNR) - * as indicator; formula is (signal dbm - noise dbm). - * SNR at or above 40 is a great signal (100%). - * Below that, scale to fit SNR of 0 - 40 dB within 0 - 100% indicator. - * Weakest usable signal is usually 10 - 15 dB SNR. */ - if (noise_dbm) { - if (rssi_dbm - noise_dbm >= 40) - return 100; - else if (rssi_dbm < noise_dbm) - return 0; - sig_qual = ((rssi_dbm - noise_dbm) * 5) / 2; - - /* Else use just the signal level. - * This formula is a least squares fit of data points collected and - * compared with a reference system that had a percentage (%) display - * for signal quality. */ - } else - sig_qual = (100 * (RSSI_RANGE * RSSI_RANGE) - degradation * - (15 * RSSI_RANGE + 62 * degradation)) / - (RSSI_RANGE * RSSI_RANGE); - - if (sig_qual > 100) - sig_qual = 100; - else if (sig_qual < 1) - sig_qual = 0; - - return sig_qual; -} /** - * iwl4965_rx_handle - Main entry function for receiving responses from uCode + * iwl_rx_handle - Main entry function for receiving responses from uCode * * Uses the priv->rx_handlers callback function array to invoke * the appropriate handlers, including command responses, * frame-received notifications, and other notifications. */ -static void iwl4965_rx_handle(struct iwl_priv *priv) +void iwl_rx_handle(struct iwl_priv *priv) { - struct iwl4965_rx_mem_buffer *rxb; + struct iwl_rx_mem_buffer *rxb; struct iwl4965_rx_packet *pkt; - struct iwl4965_rx_queue *rxq = &priv->rxq; + struct iwl_rx_queue *rxq = &priv->rxq; u32 r, i; int reclaim; unsigned long flags; @@ -3725,7 +3315,7 @@ static void iwl4965_rx_handle(struct iwl_priv *priv) if (i == r) IWL_DEBUG(IWL_DL_RX | IWL_DL_ISR, "r = %d, i = %d\n", r, i); - if (iwl4965_rx_queue_space(rxq) > (RX_QUEUE_SIZE / 2)) + if (iwl_rx_queue_space(rxq) > (RX_QUEUE_SIZE / 2)) fill_rx = 1; while (i != r) { @@ -3804,7 +3394,7 @@ static void iwl4965_rx_handle(struct iwl_priv *priv) count++; if (count >= 8) { priv->rxq.read = i; - __iwl4965_rx_replenish(priv); + __iwl_rx_replenish(priv); count = 0; } } @@ -3812,7 +3402,84 @@ static void iwl4965_rx_handle(struct iwl_priv *priv) /* Backtrack one entry */ priv->rxq.read = i; - iwl4965_rx_queue_restock(priv); + iwl_rx_queue_restock(priv); +} +/* Convert linear signal-to-noise ratio into dB */ +static u8 ratio2dB[100] = { +/* 0 1 2 3 4 5 6 7 8 9 */ + 0, 0, 6, 10, 12, 14, 16, 17, 18, 19, /* 00 - 09 */ + 20, 21, 22, 22, 23, 23, 24, 25, 26, 26, /* 10 - 19 */ + 26, 26, 26, 27, 27, 28, 28, 28, 29, 29, /* 20 - 29 */ + 29, 30, 30, 30, 31, 31, 31, 31, 32, 32, /* 30 - 39 */ + 32, 32, 32, 33, 33, 33, 33, 33, 34, 34, /* 40 - 49 */ + 34, 34, 34, 34, 35, 35, 35, 35, 35, 35, /* 50 - 59 */ + 36, 36, 36, 36, 36, 36, 36, 37, 37, 37, /* 60 - 69 */ + 37, 37, 37, 37, 37, 38, 38, 38, 38, 38, /* 70 - 79 */ + 38, 38, 38, 38, 38, 39, 39, 39, 39, 39, /* 80 - 89 */ + 39, 39, 39, 39, 39, 40, 40, 40, 40, 40 /* 90 - 99 */ +}; + +/* Calculates a relative dB value from a ratio of linear + * (i.e. not dB) signal levels. + * Conversion assumes that levels are voltages (20*log), not powers (10*log). */ +int iwl4965_calc_db_from_ratio(int sig_ratio) +{ + /* 1000:1 or higher just report as 60 dB */ + if (sig_ratio >= 1000) + return 60; + + /* 100:1 or higher, divide by 10 and use table, + * add 20 dB to make up for divide by 10 */ + if (sig_ratio >= 100) + return (20 + (int)ratio2dB[sig_ratio/10]); + + /* We shouldn't see this */ + if (sig_ratio < 1) + return 0; + + /* Use table for ratios 1:1 - 99:1 */ + return (int)ratio2dB[sig_ratio]; +} + +#define PERFECT_RSSI (-20) /* dBm */ +#define WORST_RSSI (-95) /* dBm */ +#define RSSI_RANGE (PERFECT_RSSI - WORST_RSSI) + +/* Calculate an indication of rx signal quality (a percentage, not dBm!). + * See http://www.ces.clemson.edu/linux/signal_quality.shtml for info + * about formulas used below. */ +int iwl4965_calc_sig_qual(int rssi_dbm, int noise_dbm) +{ + int sig_qual; + int degradation = PERFECT_RSSI - rssi_dbm; + + /* If we get a noise measurement, use signal-to-noise ratio (SNR) + * as indicator; formula is (signal dbm - noise dbm). + * SNR at or above 40 is a great signal (100%). + * Below that, scale to fit SNR of 0 - 40 dB within 0 - 100% indicator. + * Weakest usable signal is usually 10 - 15 dB SNR. */ + if (noise_dbm) { + if (rssi_dbm - noise_dbm >= 40) + return 100; + else if (rssi_dbm < noise_dbm) + return 0; + sig_qual = ((rssi_dbm - noise_dbm) * 5) / 2; + + /* Else use just the signal level. + * This formula is a least squares fit of data points collected and + * compared with a reference system that had a percentage (%) display + * for signal quality. */ + } else + sig_qual = (100 * (RSSI_RANGE * RSSI_RANGE) - degradation * + (15 * RSSI_RANGE + 62 * degradation)) / + (RSSI_RANGE * RSSI_RANGE); + + if (sig_qual > 100) + sig_qual = 100; + else if (sig_qual < 1) + sig_qual = 0; + + return sig_qual; } /** @@ -4248,7 +3915,7 @@ static void iwl4965_irq_tasklet(struct iwl_priv *priv) /* uCode wakes up after power-down sleep */ if (inta & CSR_INT_BIT_WAKEUP) { IWL_DEBUG_ISR("Wakeup interrupt\n"); - iwl4965_rx_queue_update_write_ptr(priv, &priv->rxq); + iwl_rx_queue_update_write_ptr(priv, &priv->rxq); iwl4965_tx_queue_update_write_ptr(priv, &priv->txq[0]); iwl4965_tx_queue_update_write_ptr(priv, &priv->txq[1]); iwl4965_tx_queue_update_write_ptr(priv, &priv->txq[2]); @@ -4263,7 +3930,7 @@ static void iwl4965_irq_tasklet(struct iwl_priv *priv) * Rx "responses" (frame-received notification), and other * notifications from uCode come through here*/ if (inta & (CSR_INT_BIT_FH_RX | CSR_INT_BIT_SW_RX)) { - iwl4965_rx_handle(priv); + iwl_rx_handle(priv); handled |= (CSR_INT_BIT_FH_RX | CSR_INT_BIT_SW_RX); } @@ -5452,7 +5119,7 @@ static void iwl4965_bg_rx_replenish(struct work_struct *data) return; mutex_lock(&priv->mutex); - iwl4965_rx_replenish(priv); + iwl_rx_replenish(priv); mutex_unlock(&priv->mutex); } @@ -7309,7 +6976,7 @@ static void __devexit iwl4965_pci_remove(struct pci_dev *pdev) iwl4965_dealloc_ucode_pci(priv); if (priv->rxq.bd) - iwl4965_rx_queue_free(priv, &priv->rxq); + iwl_rx_queue_free(priv, &priv->rxq); iwl4965_hw_txq_ctx_free(priv); iwlcore_clear_stations_table(priv);