diff options
Diffstat (limited to 'drivers/net/wireless/iwlwifi/iwl-rx.c')
| -rw-r--r-- | drivers/net/wireless/iwlwifi/iwl-rx.c | 543 |
1 files changed, 0 insertions, 543 deletions
diff --git a/drivers/net/wireless/iwlwifi/iwl-rx.c b/drivers/net/wireless/iwlwifi/iwl-rx.c deleted file mode 100644 index 0a5d7cf2519..00000000000 --- a/drivers/net/wireless/iwlwifi/iwl-rx.c +++ /dev/null @@ -1,543 +0,0 @@ -/****************************************************************************** - * - * Copyright(c) 2003 - 2010 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: - * Intel Linux Wireless <ilw@linux.intel.com> - * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 - * - *****************************************************************************/ - -#include <linux/etherdevice.h> -#include <linux/slab.h> -#include <net/mac80211.h> -#include <asm/unaligned.h> -#include "iwl-eeprom.h" -#include "iwl-dev.h" -#include "iwl-core.h" -#include "iwl-sta.h" -#include "iwl-io.h" -#include "iwl-calib.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 - */ -void iwl_rx_queue_update_write_ptr(struct iwl_priv *priv, struct iwl_rx_queue *q) -{ - unsigned long flags; - u32 rx_wrt_ptr_reg = priv->hw_params.rx_wrt_ptr_reg; - u32 reg; - - 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_DEBUG_INFO(priv, "Rx queue requesting wakeup, GP1 = 0x%x\n", - reg); - iwl_set_bit(priv, CSR_GP_CNTRL, - CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ); - goto exit_unlock; - } - - q->write_actual = (q->write & ~0x7); - iwl_write_direct32(priv, rx_wrt_ptr_reg, q->write_actual); - - /* Else device is assumed to be awake */ - } else { - /* Device expects a multiple of 8 */ - q->write_actual = (q->write & ~0x7); - iwl_write_direct32(priv, rx_wrt_ptr_reg, q->write_actual); - } - - q->need_update = 0; - - exit_unlock: - spin_unlock_irqrestore(&q->lock, flags); -} -EXPORT_SYMBOL(iwl_rx_queue_update_write_ptr); - -int iwl_rx_queue_alloc(struct iwl_priv *priv) -{ - struct iwl_rx_queue *rxq = &priv->rxq; - struct device *dev = &priv->pci_dev->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 = dma_alloc_coherent(dev, 4 * RX_QUEUE_SIZE, &rxq->dma_addr, - GFP_KERNEL); - if (!rxq->bd) - goto err_bd; - - rxq->rb_stts = dma_alloc_coherent(dev, sizeof(struct iwl_rb_status), - &rxq->rb_stts_dma, GFP_KERNEL); - if (!rxq->rb_stts) - goto err_rb; - - /* 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->write_actual = 0; - rxq->free_count = 0; - rxq->need_update = 0; - return 0; - -err_rb: - dma_free_coherent(&priv->pci_dev->dev, 4 * RX_QUEUE_SIZE, rxq->bd, - rxq->dma_addr); -err_bd: - return -ENOMEM; -} -EXPORT_SYMBOL(iwl_rx_queue_alloc); - -void iwl_rx_missed_beacon_notif(struct iwl_priv *priv, - struct iwl_rx_mem_buffer *rxb) - -{ - struct iwl_rx_packet *pkt = rxb_addr(rxb); - struct iwl_missed_beacon_notif *missed_beacon; - - missed_beacon = &pkt->u.missed_beacon; - if (le32_to_cpu(missed_beacon->consecutive_missed_beacons) > - priv->missed_beacon_threshold) { - IWL_DEBUG_CALIB(priv, "missed bcn cnsq %d totl %d rcd %d expctd %d\n", - le32_to_cpu(missed_beacon->consecutive_missed_beacons), - le32_to_cpu(missed_beacon->total_missed_becons), - le32_to_cpu(missed_beacon->num_recvd_beacons), - le32_to_cpu(missed_beacon->num_expected_beacons)); - if (!test_bit(STATUS_SCANNING, &priv->status)) - iwl_init_sensitivity(priv); - } -} -EXPORT_SYMBOL(iwl_rx_missed_beacon_notif); - -void iwl_rx_spectrum_measure_notif(struct iwl_priv *priv, - struct iwl_rx_mem_buffer *rxb) -{ - struct iwl_rx_packet *pkt = rxb_addr(rxb); - struct iwl_spectrum_notification *report = &(pkt->u.spectrum_notif); - - if (!report->state) { - IWL_DEBUG_11H(priv, - "Spectrum Measure Notification: Start\n"); - return; - } - - memcpy(&priv->measure_report, report, sizeof(*report)); - priv->measurement_status |= MEASUREMENT_READY; -} -EXPORT_SYMBOL(iwl_rx_spectrum_measure_notif); - - - -/* Calculate noise level, based on measurements during network silence just - * before arriving beacon. This measurement can be done only if we know - * exactly when to expect beacons, therefore only when we're associated. */ -static void iwl_rx_calc_noise(struct iwl_priv *priv) -{ - struct statistics_rx_non_phy *rx_info - = &(priv->statistics.rx.general); - int num_active_rx = 0; - int total_silence = 0; - int bcn_silence_a = - le32_to_cpu(rx_info->beacon_silence_rssi_a) & IN_BAND_FILTER; - int bcn_silence_b = - le32_to_cpu(rx_info->beacon_silence_rssi_b) & IN_BAND_FILTER; - int bcn_silence_c = - le32_to_cpu(rx_info->beacon_silence_rssi_c) & IN_BAND_FILTER; - int last_rx_noise; - - if (bcn_silence_a) { - total_silence += bcn_silence_a; - num_active_rx++; - } - if (bcn_silence_b) { - total_silence += bcn_silence_b; - num_active_rx++; - } - if (bcn_silence_c) { - total_silence += bcn_silence_c; - num_active_rx++; - } - - /* Average among active antennas */ - if (num_active_rx) - last_rx_noise = (total_silence / num_active_rx) - 107; - else - last_rx_noise = IWL_NOISE_MEAS_NOT_AVAILABLE; - - IWL_DEBUG_CALIB(priv, "inband silence a %u, b %u, c %u, dBm %d\n", - bcn_silence_a, bcn_silence_b, bcn_silence_c, - last_rx_noise); -} - -#ifdef CONFIG_IWLWIFI_DEBUG -/* - * based on the assumption of all statistics counter are in DWORD - * FIXME: This function is for debugging, do not deal with - * the case of counters roll-over. - */ -static void iwl_accumulative_statistics(struct iwl_priv *priv, - __le32 *stats) -{ - int i; - __le32 *prev_stats; - u32 *accum_stats; - u32 *delta, *max_delta; - - prev_stats = (__le32 *)&priv->statistics; - accum_stats = (u32 *)&priv->accum_statistics; - delta = (u32 *)&priv->delta_statistics; - max_delta = (u32 *)&priv->max_delta; - - for (i = sizeof(__le32); i < sizeof(struct iwl_notif_statistics); - i += sizeof(__le32), stats++, prev_stats++, delta++, - max_delta++, accum_stats++) { - if (le32_to_cpu(*stats) > le32_to_cpu(*prev_stats)) { - *delta = (le32_to_cpu(*stats) - - le32_to_cpu(*prev_stats)); - *accum_stats += *delta; - if (*delta > *max_delta) - *max_delta = *delta; - } - } - - /* reset accumulative statistics for "no-counter" type statistics */ - priv->accum_statistics.general.temperature = - priv->statistics.general.temperature; - priv->accum_statistics.general.temperature_m = - priv->statistics.general.temperature_m; - priv->accum_statistics.general.ttl_timestamp = - priv->statistics.general.ttl_timestamp; - priv->accum_statistics.tx.tx_power.ant_a = - priv->statistics.tx.tx_power.ant_a; - priv->accum_statistics.tx.tx_power.ant_b = - priv->statistics.tx.tx_power.ant_b; - priv->accum_statistics.tx.tx_power.ant_c = - priv->statistics.tx.tx_power.ant_c; -} -#endif - -#define REG_RECALIB_PERIOD (60) - -/** - * iwl_good_plcp_health - checks for plcp error. - * - * When the plcp error is exceeding the thresholds, reset the radio - * to improve the throughput. - */ -bool iwl_good_plcp_health(struct iwl_priv *priv, - struct iwl_rx_packet *pkt) -{ - bool rc = true; - int combined_plcp_delta; - unsigned int plcp_msec; - unsigned long plcp_received_jiffies; - - /* - * check for plcp_err and trigger radio reset if it exceeds - * the plcp error threshold plcp_delta. - */ - plcp_received_jiffies = jiffies; - plcp_msec = jiffies_to_msecs((long) plcp_received_jiffies - - (long) priv->plcp_jiffies); - priv->plcp_jiffies = plcp_received_jiffies; - /* - * check to make sure plcp_msec is not 0 to prevent division - * by zero. - */ - if (plcp_msec) { - combined_plcp_delta = - (le32_to_cpu(pkt->u.stats.rx.ofdm.plcp_err) - - le32_to_cpu(priv->statistics.rx.ofdm.plcp_err)) + - (le32_to_cpu(pkt->u.stats.rx.ofdm_ht.plcp_err) - - le32_to_cpu(priv->statistics.rx.ofdm_ht.plcp_err)); - - if ((combined_plcp_delta > 0) && - ((combined_plcp_delta * 100) / plcp_msec) > - priv->cfg->plcp_delta_threshold) { - /* - * if plcp_err exceed the threshold, - * the following data is printed in csv format: - * Text: plcp_err exceeded %d, - * Received ofdm.plcp_err, - * Current ofdm.plcp_err, - * Received ofdm_ht.plcp_err, - * Current ofdm_ht.plcp_err, - * combined_plcp_delta, - * plcp_msec - */ - IWL_DEBUG_RADIO(priv, "plcp_err exceeded %u, " - "%u, %u, %u, %u, %d, %u mSecs\n", - priv->cfg->plcp_delta_threshold, - le32_to_cpu(pkt->u.stats.rx.ofdm.plcp_err), - le32_to_cpu(priv->statistics.rx.ofdm.plcp_err), - le32_to_cpu(pkt->u.stats.rx.ofdm_ht.plcp_err), - le32_to_cpu( - priv->statistics.rx.ofdm_ht.plcp_err), - combined_plcp_delta, plcp_msec); - rc = false; - } - } - return rc; -} -EXPORT_SYMBOL(iwl_good_plcp_health); - -void iwl_recover_from_statistics(struct iwl_priv *priv, - struct iwl_rx_packet *pkt) -{ - if (test_bit(STATUS_EXIT_PENDING, &priv->status)) - return; - if (iwl_is_associated(priv)) { - if (priv->cfg->ops->lib->check_ack_health) { - if (!priv->cfg->ops->lib->check_ack_health( - priv, pkt)) { - /* - * low ack count detected - * restart Firmware - */ - IWL_ERR(priv, "low ack count detected, " - "restart firmware\n"); - if (!iwl_force_reset(priv, IWL_FW_RESET)) - return; - } - } - if (priv->cfg->ops->lib->check_plcp_health) { - if (!priv->cfg->ops->lib->check_plcp_health( - priv, pkt)) { - /* - * high plcp error detected - * reset Radio - */ - iwl_force_reset(priv, IWL_RF_RESET); - } - } - } -} -EXPORT_SYMBOL(iwl_recover_from_statistics); - -void iwl_rx_statistics(struct iwl_priv *priv, - struct iwl_rx_mem_buffer *rxb) -{ - int change; - struct iwl_rx_packet *pkt = rxb_addr(rxb); - - - IWL_DEBUG_RX(priv, "Statistics notification received (%d vs %d).\n", - (int)sizeof(priv->statistics), - le32_to_cpu(pkt->len_n_flags) & FH_RSCSR_FRAME_SIZE_MSK); - - change = ((priv->statistics.general.temperature != - pkt->u.stats.general.temperature) || - ((priv->statistics.flag & - STATISTICS_REPLY_FLG_HT40_MODE_MSK) != - (pkt->u.stats.flag & STATISTICS_REPLY_FLG_HT40_MODE_MSK))); - -#ifdef CONFIG_IWLWIFI_DEBUG - iwl_accumulative_statistics(priv, (__le32 *)&pkt->u.stats); -#endif - iwl_recover_from_statistics(priv, pkt); - - memcpy(&priv->statistics, &pkt->u.stats, sizeof(priv->statistics)); - - set_bit(STATUS_STATISTICS, &priv->status); - - /* Reschedule the statistics timer to occur in - * REG_RECALIB_PERIOD seconds to ensure we get a - * thermal update even if the uCode doesn't give - * us one */ - mod_timer(&priv->statistics_periodic, jiffies + - msecs_to_jiffies(REG_RECALIB_PERIOD * 1000)); - - if (unlikely(!test_bit(STATUS_SCANNING, &priv->status)) && - (pkt->hdr.cmd == STATISTICS_NOTIFICATION)) { - iwl_rx_calc_noise(priv); - queue_work(priv->workqueue, &priv->run_time_calib_work); - } - if (priv->cfg->ops->lib->temp_ops.temperature && change) - priv->cfg->ops->lib->temp_ops.temperature(priv); -} -EXPORT_SYMBOL(iwl_rx_statistics); - -void iwl_reply_statistics(struct iwl_priv *priv, - struct iwl_rx_mem_buffer *rxb) -{ - struct iwl_rx_packet *pkt = rxb_addr(rxb); - - if (le32_to_cpu(pkt->u.stats.flag) & UCODE_STATISTICS_CLEAR_MSK) { -#ifdef CONFIG_IWLWIFI_DEBUG - memset(&priv->accum_statistics, 0, - sizeof(struct iwl_notif_statistics)); - memset(&priv->delta_statistics, 0, - sizeof(struct iwl_notif_statistics)); - memset(&priv->max_delta, 0, - sizeof(struct iwl_notif_statistics)); -#endif - IWL_DEBUG_RX(priv, "Statistics have been cleared\n"); - } - iwl_rx_statistics(priv, rxb); -} -EXPORT_SYMBOL(iwl_reply_statistics); - -/* - * returns non-zero if packet should be dropped - */ -int iwl_set_decrypted_flag(struct iwl_priv *priv, - struct ieee80211_hdr *hdr, - u32 decrypt_res, - struct ieee80211_rx_status *stats) -{ - u16 fc = le16_to_cpu(hdr->frame_control); - - if (priv->active_rxon.filter_flags & RXON_FILTER_DIS_DECRYPT_MSK) - return 0; - - if (!(fc & IEEE80211_FCTL_PROTECTED)) - return 0; - - IWL_DEBUG_RX(priv, "decrypt_res:0x%x\n", decrypt_res); - switch (decrypt_res & RX_RES_STATUS_SEC_TYPE_MSK) { - case RX_RES_STATUS_SEC_TYPE_TKIP: - /* The uCode has got a bad phase 1 Key, pushes the packet. - * Decryption will be done in SW. */ - if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) == - RX_RES_STATUS_BAD_KEY_TTAK) - break; - - case RX_RES_STATUS_SEC_TYPE_WEP: - if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) == - RX_RES_STATUS_BAD_ICV_MIC) { - /* bad ICV, the packet is destroyed since the - * decryption is inplace, drop it */ - IWL_DEBUG_RX(priv, "Packet destroyed\n"); - return -1; - } - case RX_RES_STATUS_SEC_TYPE_CCMP: - if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) == - RX_RES_STATUS_DECRYPT_OK) { - IWL_DEBUG_RX(priv, "hw decrypt successfully!!!\n"); - stats->flag |= RX_FLAG_DECRYPTED; - } - break; - - default: - break; - } - return 0; -} -EXPORT_SYMBOL(iwl_set_decrypted_flag); |