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linux/drivers/net/wireless/iwlwifi/iwl-rx.c

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/******************************************************************************
*
* Copyright(c) 2003 - 2011 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 <linux/sched.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-helpers.h"
#include "iwl-agn-calib.h"
#include "iwl-agn.h"
/******************************************************************************
*
* RX path 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;
}
/**
* 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 (priv->cfg->base_params->shadow_reg_enable) {
/* shadow register enabled */
/* Device expects a multiple of 8 */
q->write_actual = (q->write & ~0x7);
iwl_write32(priv, rx_wrt_ptr_reg, q->write_actual);
} else {
/* 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);
}
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->bd_dma,
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->bd_dma);
err_bd:
return -ENOMEM;
}
/******************************************************************************
*
* Generic RX handler implementations
*
******************************************************************************/
static void iwl_rx_reply_error(struct iwl_priv *priv,
struct iwl_rx_mem_buffer *rxb)
{
struct iwl_rx_packet *pkt = rxb_addr(rxb);
IWL_ERR(priv, "Error Reply type 0x%08X cmd %s (0x%02X) "
"seq 0x%04X ser 0x%08X\n",
le32_to_cpu(pkt->u.err_resp.error_type),
get_cmd_string(pkt->u.err_resp.cmd_id),
pkt->u.err_resp.cmd_id,
le16_to_cpu(pkt->u.err_resp.bad_cmd_seq_num),
le32_to_cpu(pkt->u.err_resp.error_info));
}
static void iwl_rx_csa(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb)
{
struct iwl_rx_packet *pkt = rxb_addr(rxb);
struct iwl_csa_notification *csa = &(pkt->u.csa_notif);
/*
* MULTI-FIXME
* See iwl_mac_channel_switch.
*/
struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
struct iwl_rxon_cmd *rxon = (void *)&ctx->active;
if (!test_bit(STATUS_CHANNEL_SWITCH_PENDING, &priv->status))
return;
if (!le32_to_cpu(csa->status) && csa->channel == priv->switch_channel) {
rxon->channel = csa->channel;
ctx->staging.channel = csa->channel;
IWL_DEBUG_11H(priv, "CSA notif: channel %d\n",
le16_to_cpu(csa->channel));
iwl_chswitch_done(priv, true);
} else {
IWL_ERR(priv, "CSA notif (fail) : channel %d\n",
le16_to_cpu(csa->channel));
iwl_chswitch_done(priv, false);
}
}
static 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;
}
static void iwl_rx_pm_sleep_notif(struct iwl_priv *priv,
struct iwl_rx_mem_buffer *rxb)
{
#ifdef CONFIG_IWLWIFI_DEBUG
struct iwl_rx_packet *pkt = rxb_addr(rxb);
struct iwl_sleep_notification *sleep = &(pkt->u.sleep_notif);
IWL_DEBUG_RX(priv, "sleep mode: %d, src: %d\n",
sleep->pm_sleep_mode, sleep->pm_wakeup_src);
#endif
}
static void iwl_rx_pm_debug_statistics_notif(struct iwl_priv *priv,
struct iwl_rx_mem_buffer *rxb)
{
struct iwl_rx_packet *pkt = rxb_addr(rxb);
u32 len = le32_to_cpu(pkt->len_n_flags) & FH_RSCSR_FRAME_SIZE_MSK;
IWL_DEBUG_RADIO(priv, "Dumping %d bytes of unhandled "
"notification for %s:\n", len,
get_cmd_string(pkt->hdr.cmd));
iwl_print_hex_dump(priv, IWL_DL_RADIO, pkt->u.raw, len);
}
static void iwl_rx_beacon_notif(struct iwl_priv *priv,
struct iwl_rx_mem_buffer *rxb)
{
struct iwl_rx_packet *pkt = rxb_addr(rxb);
struct iwlagn_beacon_notif *beacon = (void *)pkt->u.raw;
#ifdef CONFIG_IWLWIFI_DEBUG
u16 status = le16_to_cpu(beacon->beacon_notify_hdr.status.status);
u8 rate = iwl_hw_get_rate(beacon->beacon_notify_hdr.rate_n_flags);
IWL_DEBUG_RX(priv, "beacon status %#x, retries:%d ibssmgr:%d "
"tsf:0x%.8x%.8x rate:%d\n",
status & TX_STATUS_MSK,
beacon->beacon_notify_hdr.failure_frame,
le32_to_cpu(beacon->ibss_mgr_status),
le32_to_cpu(beacon->high_tsf),
le32_to_cpu(beacon->low_tsf), rate);
#endif
priv->ibss_manager = le32_to_cpu(beacon->ibss_mgr_status);
if (!test_bit(STATUS_EXIT_PENDING, &priv->status))
queue_work(priv->workqueue, &priv->beacon_update);
}
/* the threshold ratio of actual_ack_cnt to expected_ack_cnt in percent */
#define ACK_CNT_RATIO (50)
#define BA_TIMEOUT_CNT (5)
#define BA_TIMEOUT_MAX (16)
/**
* iwl_good_ack_health - checks for ACK count ratios, BA timeout retries.
*
* When the ACK count ratio is low and aggregated BA timeout retries exceeding
* the BA_TIMEOUT_MAX, reload firmware and bring system back to normal
* operation state.
*/
static bool iwl_good_ack_health(struct iwl_priv *priv,
struct statistics_tx *cur)
{
int actual_delta, expected_delta, ba_timeout_delta;
struct statistics_tx *old;
if (priv->_agn.agg_tids_count)
return true;
old = &priv->statistics.tx;
actual_delta = le32_to_cpu(cur->actual_ack_cnt) -
le32_to_cpu(old->actual_ack_cnt);
expected_delta = le32_to_cpu(cur->expected_ack_cnt) -
le32_to_cpu(old->expected_ack_cnt);
/* Values should not be negative, but we do not trust the firmware */
if (actual_delta <= 0 || expected_delta <= 0)
return true;
ba_timeout_delta = le32_to_cpu(cur->agg.ba_timeout) -
le32_to_cpu(old->agg.ba_timeout);
if ((actual_delta * 100 / expected_delta) < ACK_CNT_RATIO &&
ba_timeout_delta > BA_TIMEOUT_CNT) {
IWL_DEBUG_RADIO(priv, "deltas: actual %d expected %d ba_timeout %d\n",
actual_delta, expected_delta, ba_timeout_delta);
#ifdef CONFIG_IWLWIFI_DEBUGFS
/*
* This is ifdef'ed on DEBUGFS because otherwise the
* statistics aren't available. If DEBUGFS is set but
* DEBUG is not, these will just compile out.
*/
IWL_DEBUG_RADIO(priv, "rx_detected_cnt delta %d\n",
priv->delta_stats.tx.rx_detected_cnt);
IWL_DEBUG_RADIO(priv,
"ack_or_ba_timeout_collision delta %d\n",
priv->delta_stats.tx.ack_or_ba_timeout_collision);
#endif
if (ba_timeout_delta >= BA_TIMEOUT_MAX)
return false;
}
return true;
}
/**
* iwl_good_plcp_health - checks for plcp error.
*
* When the plcp error is exceeding the thresholds, reset the radio
* to improve the throughput.
*/
static bool iwl_good_plcp_health(struct iwl_priv *priv,
struct statistics_rx_phy *cur_ofdm,
struct statistics_rx_ht_phy *cur_ofdm_ht,
unsigned int msecs)
{
int delta;
int threshold = priv->cfg->base_params->plcp_delta_threshold;
if (threshold == IWL_MAX_PLCP_ERR_THRESHOLD_DISABLE) {
IWL_DEBUG_RADIO(priv, "plcp_err check disabled\n");
return true;
}
delta = le32_to_cpu(cur_ofdm->plcp_err) -
le32_to_cpu(priv->statistics.rx_ofdm.plcp_err) +
le32_to_cpu(cur_ofdm_ht->plcp_err) -
le32_to_cpu(priv->statistics.rx_ofdm_ht.plcp_err);
/* Can be negative if firmware reset statistics */
if (delta <= 0)
return true;
if ((delta * 100 / msecs) > threshold) {
IWL_DEBUG_RADIO(priv,
"plcp health threshold %u delta %d msecs %u\n",
threshold, delta, msecs);
return false;
}
return true;
}
static void iwl_recover_from_statistics(struct iwl_priv *priv,
struct statistics_rx_phy *cur_ofdm,
struct statistics_rx_ht_phy *cur_ofdm_ht,
struct statistics_tx *tx,
unsigned long stamp)
{
unsigned int msecs;
if (test_bit(STATUS_EXIT_PENDING, &priv->status))
return;
msecs = jiffies_to_msecs(stamp - priv->rx_statistics_jiffies);
/* Only gather statistics and update time stamp when not associated */
if (!iwl_is_any_associated(priv))
return;
/* Do not check/recover when do not have enough statistics data */
if (msecs < 99)
return;
if (iwlagn_mod_params.ack_check && !iwl_good_ack_health(priv, tx)) {
IWL_ERR(priv, "low ack count detected, restart firmware\n");
if (!iwl_force_reset(priv, IWL_FW_RESET, false))
return;
}
if (iwlagn_mod_params.plcp_check &&
!iwl_good_plcp_health(priv, cur_ofdm, cur_ofdm_ht, msecs))
iwl_force_reset(priv, IWL_RF_RESET, false);
}
/* 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;
int num_active_rx = 0;
int total_silence = 0;
int bcn_silence_a, bcn_silence_b, bcn_silence_c;
int last_rx_noise;
rx_info = &priv->statistics.rx_non_phy;
bcn_silence_a =
le32_to_cpu(rx_info->beacon_silence_rssi_a) & IN_BAND_FILTER;
bcn_silence_b =
le32_to_cpu(rx_info->beacon_silence_rssi_b) & IN_BAND_FILTER;
bcn_silence_c =
le32_to_cpu(rx_info->beacon_silence_rssi_c) & IN_BAND_FILTER;
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_DEBUGFS
/*
* 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 accum_stats(__le32 *prev, __le32 *cur, __le32 *delta,
__le32 *max_delta, __le32 *accum, int size)
{
int i;
for (i = 0;
i < size / sizeof(__le32);
i++, prev++, cur++, delta++, max_delta++, accum++) {
if (le32_to_cpu(*cur) > le32_to_cpu(*prev)) {
*delta = cpu_to_le32(
le32_to_cpu(*cur) - le32_to_cpu(*prev));
le32_add_cpu(accum, le32_to_cpu(*delta));
if (le32_to_cpu(*delta) > le32_to_cpu(*max_delta))
*max_delta = *delta;
}
}
}
static void
iwl_accumulative_statistics(struct iwl_priv *priv,
struct statistics_general_common *common,
struct statistics_rx_non_phy *rx_non_phy,
struct statistics_rx_phy *rx_ofdm,
struct statistics_rx_ht_phy *rx_ofdm_ht,
struct statistics_rx_phy *rx_cck,
struct statistics_tx *tx,
struct statistics_bt_activity *bt_activity)
{
#define ACCUM(_name) \
accum_stats((__le32 *)&priv->statistics._name, \
(__le32 *)_name, \
(__le32 *)&priv->delta_stats._name, \
(__le32 *)&priv->max_delta_stats._name, \
(__le32 *)&priv->accum_stats._name, \
sizeof(*_name));
ACCUM(common);
ACCUM(rx_non_phy);
ACCUM(rx_ofdm);
ACCUM(rx_ofdm_ht);
ACCUM(rx_cck);
ACCUM(tx);
if (bt_activity)
ACCUM(bt_activity);
#undef ACCUM
}
#else
static inline void
iwl_accumulative_statistics(struct iwl_priv *priv,
struct statistics_general_common *common,
struct statistics_rx_non_phy *rx_non_phy,
struct statistics_rx_phy *rx_ofdm,
struct statistics_rx_ht_phy *rx_ofdm_ht,
struct statistics_rx_phy *rx_cck,
struct statistics_tx *tx,
struct statistics_bt_activity *bt_activity)
{
}
#endif
static void iwl_rx_statistics(struct iwl_priv *priv,
struct iwl_rx_mem_buffer *rxb)
{
unsigned long stamp = jiffies;
const int reg_recalib_period = 60;
int change;
struct iwl_rx_packet *pkt = rxb_addr(rxb);
u32 len = le32_to_cpu(pkt->len_n_flags) & FH_RSCSR_FRAME_SIZE_MSK;
__le32 *flag;
struct statistics_general_common *common;
struct statistics_rx_non_phy *rx_non_phy;
struct statistics_rx_phy *rx_ofdm;
struct statistics_rx_ht_phy *rx_ofdm_ht;
struct statistics_rx_phy *rx_cck;
struct statistics_tx *tx;
struct statistics_bt_activity *bt_activity;
len -= sizeof(struct iwl_cmd_header); /* skip header */
IWL_DEBUG_RX(priv, "Statistics notification received (%d bytes).\n",
len);
if (len == sizeof(struct iwl_bt_notif_statistics)) {
struct iwl_bt_notif_statistics *stats;
stats = &pkt->u.stats_bt;
flag = &stats->flag;
common = &stats->general.common;
rx_non_phy = &stats->rx.general.common;
rx_ofdm = &stats->rx.ofdm;
rx_ofdm_ht = &stats->rx.ofdm_ht;
rx_cck = &stats->rx.cck;
tx = &stats->tx;
bt_activity = &stats->general.activity;
#ifdef CONFIG_IWLWIFI_DEBUGFS
/* handle this exception directly */
priv->statistics.num_bt_kills = stats->rx.general.num_bt_kills;
le32_add_cpu(&priv->statistics.accum_num_bt_kills,
le32_to_cpu(stats->rx.general.num_bt_kills));
#endif
} else if (len == sizeof(struct iwl_notif_statistics)) {
struct iwl_notif_statistics *stats;
stats = &pkt->u.stats;
flag = &stats->flag;
common = &stats->general.common;
rx_non_phy = &stats->rx.general;
rx_ofdm = &stats->rx.ofdm;
rx_ofdm_ht = &stats->rx.ofdm_ht;
rx_cck = &stats->rx.cck;
tx = &stats->tx;
bt_activity = NULL;
} else {
WARN_ONCE(1, "len %d doesn't match BT (%zu) or normal (%zu)\n",
len, sizeof(struct iwl_bt_notif_statistics),
sizeof(struct iwl_notif_statistics));
return;
}
change = common->temperature != priv->statistics.common.temperature ||
(*flag & STATISTICS_REPLY_FLG_HT40_MODE_MSK) !=
(priv->statistics.flag & STATISTICS_REPLY_FLG_HT40_MODE_MSK);
iwl_accumulative_statistics(priv, common, rx_non_phy, rx_ofdm,
rx_ofdm_ht, rx_cck, tx, bt_activity);
iwl_recover_from_statistics(priv, rx_ofdm, rx_ofdm_ht, tx, stamp);
priv->statistics.flag = *flag;
memcpy(&priv->statistics.common, common, sizeof(*common));
memcpy(&priv->statistics.rx_non_phy, rx_non_phy, sizeof(*rx_non_phy));
memcpy(&priv->statistics.rx_ofdm, rx_ofdm, sizeof(*rx_ofdm));
memcpy(&priv->statistics.rx_ofdm_ht, rx_ofdm_ht, sizeof(*rx_ofdm_ht));
memcpy(&priv->statistics.rx_cck, rx_cck, sizeof(*rx_cck));
memcpy(&priv->statistics.tx, tx, sizeof(*tx));
#ifdef CONFIG_IWLWIFI_DEBUGFS
if (bt_activity)
memcpy(&priv->statistics.bt_activity, bt_activity,
sizeof(*bt_activity));
#endif
priv->rx_statistics_jiffies = stamp;
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);
}
static void iwl_rx_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_DEBUGFS
memset(&priv->accum_stats, 0,
sizeof(priv->accum_stats));
memset(&priv->delta_stats, 0,
sizeof(priv->delta_stats));
memset(&priv->max_delta_stats, 0,
sizeof(priv->max_delta_stats));
#endif
IWL_DEBUG_RX(priv, "Statistics have been cleared\n");
}
iwl_rx_statistics(priv, rxb);
}
/* Handle notification from uCode that card's power state is changing
* due to software, hardware, or critical temperature RFKILL */
static void iwl_rx_card_state_notif(struct iwl_priv *priv,
struct iwl_rx_mem_buffer *rxb)
{
struct iwl_rx_packet *pkt = rxb_addr(rxb);
u32 flags = le32_to_cpu(pkt->u.card_state_notif.flags);
unsigned long status = priv->status;
IWL_DEBUG_RF_KILL(priv, "Card state received: HW:%s SW:%s CT:%s\n",
(flags & HW_CARD_DISABLED) ? "Kill" : "On",
(flags & SW_CARD_DISABLED) ? "Kill" : "On",
(flags & CT_CARD_DISABLED) ?
"Reached" : "Not reached");
if (flags & (SW_CARD_DISABLED | HW_CARD_DISABLED |
CT_CARD_DISABLED)) {
iwl_write32(priv, CSR_UCODE_DRV_GP1_SET,
CSR_UCODE_DRV_GP1_BIT_CMD_BLOCKED);
iwl_write_direct32(priv, HBUS_TARG_MBX_C,
HBUS_TARG_MBX_C_REG_BIT_CMD_BLOCKED);
if (!(flags & RXON_CARD_DISABLED)) {
iwl_write32(priv, CSR_UCODE_DRV_GP1_CLR,
CSR_UCODE_DRV_GP1_BIT_CMD_BLOCKED);
iwl_write_direct32(priv, HBUS_TARG_MBX_C,
HBUS_TARG_MBX_C_REG_BIT_CMD_BLOCKED);
}
if (flags & CT_CARD_DISABLED)
iwl_tt_enter_ct_kill(priv);
}
if (!(flags & CT_CARD_DISABLED))
iwl_tt_exit_ct_kill(priv);
if (flags & HW_CARD_DISABLED)
set_bit(STATUS_RF_KILL_HW, &priv->status);
else
clear_bit(STATUS_RF_KILL_HW, &priv->status);
if (!(flags & RXON_CARD_DISABLED))
iwl_scan_cancel(priv);
if ((test_bit(STATUS_RF_KILL_HW, &status) !=
test_bit(STATUS_RF_KILL_HW, &priv->status)))
wiphy_rfkill_set_hw_state(priv->hw->wiphy,
test_bit(STATUS_RF_KILL_HW, &priv->status));
else
wake_up_interruptible(&priv->wait_command_queue);
}
static 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);
}
}
/* 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. */
static void iwl_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));
}
/*
* returns non-zero if packet should be dropped
*/
static 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);
/*
* All contexts have the same setting here due to it being
* a module parameter, so OK to check any context.
*/
if (priv->contexts[IWL_RXON_CTX_BSS].active.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;
}
static void iwl_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;
struct iwl_rxon_context *ctx;
/* 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 (!iwlagn_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);
/*
* Wake any queues that were stopped due to a passive channel tx
* failure. This can happen because the regulatory enforcement in
* the device waits for a beacon before allowing transmission,
* sometimes even after already having transmitted frames for the
* association because the new RXON may reset the information.
*/
if (unlikely(ieee80211_is_beacon(fc))) {
for_each_context(priv, ctx) {
if (!ctx->last_tx_rejected)
continue;
if (compare_ether_addr(hdr->addr3,
ctx->active.bssid_addr))
continue;
ctx->last_tx_rejected = false;
iwl_wake_any_queue(priv, ctx);
}
}
memcpy(IEEE80211_SKB_RXCB(skb), stats, sizeof(*stats));
ieee80211_rx(priv->hw, skb);
rxb->page = NULL;
}
static u32 iwl_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;
}
/* Called for REPLY_RX (legacy ABG frames), or
* REPLY_RX_MPDU_CMD (HT high-throughput N frames). */
static void iwl_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 iwl_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 iwl_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 = iwl_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.band = (phy_res->phy_flags & RX_RES_PHY_FLAGS_BAND_24_MSK) ?
IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
rx_status.freq =
ieee80211_channel_to_frequency(le16_to_cpu(phy_res->channel),
rx_status.band);
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_MACTIME_MPDU;*/
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 = priv->cfg->ops->utils->calc_rssi(priv, phy_res);
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;
iwl_pass_packet_to_mac80211(priv, header, len, ampdu_status,
rxb, &rx_status);
}
/**
* iwl_setup_rx_handlers - Initialize Rx handler callbacks
*
* Setup the RX handlers for each of the reply types sent from the uCode
* to the host.
*/
void iwl_setup_rx_handlers(struct iwl_priv *priv)
{
void (**handlers)(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb);
handlers = priv->rx_handlers;
handlers[REPLY_ERROR] = iwl_rx_reply_error;
handlers[CHANNEL_SWITCH_NOTIFICATION] = iwl_rx_csa;
handlers[SPECTRUM_MEASURE_NOTIFICATION] = iwl_rx_spectrum_measure_notif;
handlers[PM_SLEEP_NOTIFICATION] = iwl_rx_pm_sleep_notif;
handlers[PM_DEBUG_STATISTIC_NOTIFIC] = iwl_rx_pm_debug_statistics_notif;
handlers[BEACON_NOTIFICATION] = iwl_rx_beacon_notif;
/*
* The same handler is used for both the REPLY to a discrete
* statistics request from the host as well as for the periodic
* statistics notifications (after received beacons) from the uCode.
*/
handlers[REPLY_STATISTICS_CMD] = iwl_rx_reply_statistics;
handlers[STATISTICS_NOTIFICATION] = iwl_rx_statistics;
iwl_setup_rx_scan_handlers(priv);
handlers[CARD_STATE_NOTIFICATION] = iwl_rx_card_state_notif;
handlers[MISSED_BEACONS_NOTIFICATION] = iwl_rx_missed_beacon_notif;
/* Rx handlers */
handlers[REPLY_RX_PHY_CMD] = iwl_rx_reply_rx_phy;
handlers[REPLY_RX_MPDU_CMD] = iwl_rx_reply_rx;
/* block ack */
handlers[REPLY_COMPRESSED_BA] = iwlagn_rx_reply_compressed_ba;
/* Set up hardware specific Rx handlers */
priv->cfg->ops->lib->rx_handler_setup(priv);
}
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