forked from Minki/linux
3b51cc996e
Conflicts: drivers/net/wireless/ath/ath9k/phy.c drivers/net/wireless/iwlwifi/iwl-6000.c drivers/net/wireless/iwlwifi/iwl-debugfs.c
529 lines
15 KiB
C
529 lines
15 KiB
C
/******************************************************************************
|
|
*
|
|
* GPL LICENSE SUMMARY
|
|
*
|
|
* Copyright(c) 2008 - 2010 Intel Corporation. All rights reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of version 2 of the GNU General Public License as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful, but
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
|
|
* USA
|
|
*
|
|
* The full GNU General Public License is included in this distribution
|
|
* in the file called LICENSE.GPL.
|
|
*
|
|
* Contact Information:
|
|
* Intel Linux Wireless <ilw@linux.intel.com>
|
|
* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
|
|
*****************************************************************************/
|
|
#include <linux/slab.h>
|
|
#include <linux/types.h>
|
|
#include <linux/etherdevice.h>
|
|
#include <net/mac80211.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"
|
|
|
|
/* For active scan, listen ACTIVE_DWELL_TIME (msec) on each channel after
|
|
* sending probe req. This should be set long enough to hear probe responses
|
|
* from more than one AP. */
|
|
#define IWL_ACTIVE_DWELL_TIME_24 (30) /* all times in msec */
|
|
#define IWL_ACTIVE_DWELL_TIME_52 (20)
|
|
|
|
#define IWL_ACTIVE_DWELL_FACTOR_24GHZ (3)
|
|
#define IWL_ACTIVE_DWELL_FACTOR_52GHZ (2)
|
|
|
|
/* For passive scan, listen PASSIVE_DWELL_TIME (msec) on each channel.
|
|
* Must be set longer than active dwell time.
|
|
* For the most reliable scan, set > AP beacon interval (typically 100msec). */
|
|
#define IWL_PASSIVE_DWELL_TIME_24 (20) /* all times in msec */
|
|
#define IWL_PASSIVE_DWELL_TIME_52 (10)
|
|
#define IWL_PASSIVE_DWELL_BASE (100)
|
|
#define IWL_CHANNEL_TUNE_TIME 5
|
|
|
|
|
|
|
|
/**
|
|
* iwl_scan_cancel - Cancel any currently executing HW scan
|
|
*
|
|
* NOTE: priv->mutex is not required before calling this function
|
|
*/
|
|
int iwl_scan_cancel(struct iwl_priv *priv)
|
|
{
|
|
if (!test_bit(STATUS_SCAN_HW, &priv->status)) {
|
|
clear_bit(STATUS_SCANNING, &priv->status);
|
|
return 0;
|
|
}
|
|
|
|
if (test_bit(STATUS_SCANNING, &priv->status)) {
|
|
if (!test_and_set_bit(STATUS_SCAN_ABORTING, &priv->status)) {
|
|
IWL_DEBUG_SCAN(priv, "Queuing scan abort.\n");
|
|
queue_work(priv->workqueue, &priv->abort_scan);
|
|
|
|
} else
|
|
IWL_DEBUG_SCAN(priv, "Scan abort already in progress.\n");
|
|
|
|
return test_bit(STATUS_SCANNING, &priv->status);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(iwl_scan_cancel);
|
|
/**
|
|
* iwl_scan_cancel_timeout - Cancel any currently executing HW scan
|
|
* @ms: amount of time to wait (in milliseconds) for scan to abort
|
|
*
|
|
* NOTE: priv->mutex must be held before calling this function
|
|
*/
|
|
int iwl_scan_cancel_timeout(struct iwl_priv *priv, unsigned long ms)
|
|
{
|
|
unsigned long now = jiffies;
|
|
int ret;
|
|
|
|
ret = iwl_scan_cancel(priv);
|
|
if (ret && ms) {
|
|
mutex_unlock(&priv->mutex);
|
|
while (!time_after(jiffies, now + msecs_to_jiffies(ms)) &&
|
|
test_bit(STATUS_SCANNING, &priv->status))
|
|
msleep(1);
|
|
mutex_lock(&priv->mutex);
|
|
|
|
return test_bit(STATUS_SCANNING, &priv->status);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(iwl_scan_cancel_timeout);
|
|
|
|
static int iwl_send_scan_abort(struct iwl_priv *priv)
|
|
{
|
|
int ret = 0;
|
|
struct iwl_rx_packet *pkt;
|
|
struct iwl_host_cmd cmd = {
|
|
.id = REPLY_SCAN_ABORT_CMD,
|
|
.flags = CMD_WANT_SKB,
|
|
};
|
|
|
|
/* If there isn't a scan actively going on in the hardware
|
|
* then we are in between scan bands and not actually
|
|
* actively scanning, so don't send the abort command */
|
|
if (!test_bit(STATUS_SCAN_HW, &priv->status)) {
|
|
clear_bit(STATUS_SCAN_ABORTING, &priv->status);
|
|
return 0;
|
|
}
|
|
|
|
ret = iwl_send_cmd_sync(priv, &cmd);
|
|
if (ret) {
|
|
clear_bit(STATUS_SCAN_ABORTING, &priv->status);
|
|
return ret;
|
|
}
|
|
|
|
pkt = (struct iwl_rx_packet *)cmd.reply_page;
|
|
if (pkt->u.status != CAN_ABORT_STATUS) {
|
|
/* The scan abort will return 1 for success or
|
|
* 2 for "failure". A failure condition can be
|
|
* due to simply not being in an active scan which
|
|
* can occur if we send the scan abort before we
|
|
* the microcode has notified us that a scan is
|
|
* completed. */
|
|
IWL_DEBUG_INFO(priv, "SCAN_ABORT returned %d.\n", pkt->u.status);
|
|
clear_bit(STATUS_SCAN_ABORTING, &priv->status);
|
|
clear_bit(STATUS_SCAN_HW, &priv->status);
|
|
}
|
|
|
|
iwl_free_pages(priv, cmd.reply_page);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* Service response to REPLY_SCAN_CMD (0x80) */
|
|
static void iwl_rx_reply_scan(struct iwl_priv *priv,
|
|
struct iwl_rx_mem_buffer *rxb)
|
|
{
|
|
#ifdef CONFIG_IWLWIFI_DEBUG
|
|
struct iwl_rx_packet *pkt = rxb_addr(rxb);
|
|
struct iwl_scanreq_notification *notif =
|
|
(struct iwl_scanreq_notification *)pkt->u.raw;
|
|
|
|
IWL_DEBUG_RX(priv, "Scan request status = 0x%x\n", notif->status);
|
|
#endif
|
|
}
|
|
|
|
/* Service SCAN_START_NOTIFICATION (0x82) */
|
|
static void iwl_rx_scan_start_notif(struct iwl_priv *priv,
|
|
struct iwl_rx_mem_buffer *rxb)
|
|
{
|
|
struct iwl_rx_packet *pkt = rxb_addr(rxb);
|
|
struct iwl_scanstart_notification *notif =
|
|
(struct iwl_scanstart_notification *)pkt->u.raw;
|
|
priv->scan_start_tsf = le32_to_cpu(notif->tsf_low);
|
|
IWL_DEBUG_SCAN(priv, "Scan start: "
|
|
"%d [802.11%s] "
|
|
"(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n",
|
|
notif->channel,
|
|
notif->band ? "bg" : "a",
|
|
le32_to_cpu(notif->tsf_high),
|
|
le32_to_cpu(notif->tsf_low),
|
|
notif->status, notif->beacon_timer);
|
|
}
|
|
|
|
/* Service SCAN_RESULTS_NOTIFICATION (0x83) */
|
|
static void iwl_rx_scan_results_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_scanresults_notification *notif =
|
|
(struct iwl_scanresults_notification *)pkt->u.raw;
|
|
|
|
IWL_DEBUG_SCAN(priv, "Scan ch.res: "
|
|
"%d [802.11%s] "
|
|
"(TSF: 0x%08X:%08X) - %d "
|
|
"elapsed=%lu usec\n",
|
|
notif->channel,
|
|
notif->band ? "bg" : "a",
|
|
le32_to_cpu(notif->tsf_high),
|
|
le32_to_cpu(notif->tsf_low),
|
|
le32_to_cpu(notif->statistics[0]),
|
|
le32_to_cpu(notif->tsf_low) - priv->scan_start_tsf);
|
|
#endif
|
|
}
|
|
|
|
/* Service SCAN_COMPLETE_NOTIFICATION (0x84) */
|
|
static void iwl_rx_scan_complete_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_scancomplete_notification *scan_notif = (void *)pkt->u.raw;
|
|
|
|
IWL_DEBUG_SCAN(priv, "Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n",
|
|
scan_notif->scanned_channels,
|
|
scan_notif->tsf_low,
|
|
scan_notif->tsf_high, scan_notif->status);
|
|
#endif
|
|
|
|
/* The HW is no longer scanning */
|
|
clear_bit(STATUS_SCAN_HW, &priv->status);
|
|
|
|
IWL_DEBUG_INFO(priv, "Scan on %sGHz took %dms\n",
|
|
(priv->scan_band == IEEE80211_BAND_2GHZ) ? "2.4" : "5.2",
|
|
jiffies_to_msecs(elapsed_jiffies
|
|
(priv->scan_start, jiffies)));
|
|
|
|
/*
|
|
* If a request to abort was given, or the scan did not succeed
|
|
* then we reset the scan state machine and terminate,
|
|
* re-queuing another scan if one has been requested
|
|
*/
|
|
if (test_and_clear_bit(STATUS_SCAN_ABORTING, &priv->status))
|
|
IWL_DEBUG_INFO(priv, "Aborted scan completed.\n");
|
|
|
|
IWL_DEBUG_INFO(priv, "Setting scan to off\n");
|
|
|
|
clear_bit(STATUS_SCANNING, &priv->status);
|
|
|
|
queue_work(priv->workqueue, &priv->scan_completed);
|
|
}
|
|
|
|
void iwl_setup_rx_scan_handlers(struct iwl_priv *priv)
|
|
{
|
|
/* scan handlers */
|
|
priv->rx_handlers[REPLY_SCAN_CMD] = iwl_rx_reply_scan;
|
|
priv->rx_handlers[SCAN_START_NOTIFICATION] = iwl_rx_scan_start_notif;
|
|
priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] =
|
|
iwl_rx_scan_results_notif;
|
|
priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] =
|
|
iwl_rx_scan_complete_notif;
|
|
}
|
|
EXPORT_SYMBOL(iwl_setup_rx_scan_handlers);
|
|
|
|
inline u16 iwl_get_active_dwell_time(struct iwl_priv *priv,
|
|
enum ieee80211_band band,
|
|
u8 n_probes)
|
|
{
|
|
if (band == IEEE80211_BAND_5GHZ)
|
|
return IWL_ACTIVE_DWELL_TIME_52 +
|
|
IWL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1);
|
|
else
|
|
return IWL_ACTIVE_DWELL_TIME_24 +
|
|
IWL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1);
|
|
}
|
|
EXPORT_SYMBOL(iwl_get_active_dwell_time);
|
|
|
|
u16 iwl_get_passive_dwell_time(struct iwl_priv *priv,
|
|
enum ieee80211_band band)
|
|
{
|
|
u16 passive = (band == IEEE80211_BAND_2GHZ) ?
|
|
IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 :
|
|
IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52;
|
|
|
|
if (iwl_is_associated(priv)) {
|
|
/* If we're associated, we clamp the maximum passive
|
|
* dwell time to be 98% of the beacon interval (minus
|
|
* 2 * channel tune time) */
|
|
passive = priv->beacon_int;
|
|
if ((passive > IWL_PASSIVE_DWELL_BASE) || !passive)
|
|
passive = IWL_PASSIVE_DWELL_BASE;
|
|
passive = (passive * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
|
|
}
|
|
|
|
return passive;
|
|
}
|
|
EXPORT_SYMBOL(iwl_get_passive_dwell_time);
|
|
|
|
void iwl_init_scan_params(struct iwl_priv *priv)
|
|
{
|
|
u8 ant_idx = fls(priv->hw_params.valid_tx_ant) - 1;
|
|
if (!priv->scan_tx_ant[IEEE80211_BAND_5GHZ])
|
|
priv->scan_tx_ant[IEEE80211_BAND_5GHZ] = ant_idx;
|
|
if (!priv->scan_tx_ant[IEEE80211_BAND_2GHZ])
|
|
priv->scan_tx_ant[IEEE80211_BAND_2GHZ] = ant_idx;
|
|
}
|
|
EXPORT_SYMBOL(iwl_init_scan_params);
|
|
|
|
static int iwl_scan_initiate(struct iwl_priv *priv)
|
|
{
|
|
WARN_ON(!mutex_is_locked(&priv->mutex));
|
|
|
|
IWL_DEBUG_INFO(priv, "Starting scan...\n");
|
|
set_bit(STATUS_SCANNING, &priv->status);
|
|
priv->is_internal_short_scan = false;
|
|
priv->scan_start = jiffies;
|
|
|
|
if (WARN_ON(!priv->cfg->ops->utils->request_scan))
|
|
return -EOPNOTSUPP;
|
|
|
|
priv->cfg->ops->utils->request_scan(priv);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int iwl_mac_hw_scan(struct ieee80211_hw *hw,
|
|
struct cfg80211_scan_request *req)
|
|
{
|
|
struct iwl_priv *priv = hw->priv;
|
|
int ret;
|
|
|
|
IWL_DEBUG_MAC80211(priv, "enter\n");
|
|
|
|
if (req->n_channels == 0)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&priv->mutex);
|
|
|
|
if (!iwl_is_ready_rf(priv)) {
|
|
ret = -EIO;
|
|
IWL_DEBUG_MAC80211(priv, "leave - not ready or exit pending\n");
|
|
goto out_unlock;
|
|
}
|
|
|
|
if (test_bit(STATUS_SCANNING, &priv->status)) {
|
|
IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
|
|
ret = -EAGAIN;
|
|
goto out_unlock;
|
|
}
|
|
|
|
if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
|
|
IWL_DEBUG_SCAN(priv, "Scan request while abort pending\n");
|
|
ret = -EAGAIN;
|
|
goto out_unlock;
|
|
}
|
|
|
|
/* mac80211 will only ask for one band at a time */
|
|
priv->scan_band = req->channels[0]->band;
|
|
priv->scan_request = req;
|
|
|
|
ret = iwl_scan_initiate(priv);
|
|
|
|
IWL_DEBUG_MAC80211(priv, "leave\n");
|
|
|
|
out_unlock:
|
|
mutex_unlock(&priv->mutex);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(iwl_mac_hw_scan);
|
|
|
|
/*
|
|
* internal short scan, this function should only been called while associated.
|
|
* It will reset and tune the radio to prevent possible RF related problem
|
|
*/
|
|
void iwl_internal_short_hw_scan(struct iwl_priv *priv)
|
|
{
|
|
queue_work(priv->workqueue, &priv->start_internal_scan);
|
|
}
|
|
|
|
static void iwl_bg_start_internal_scan(struct work_struct *work)
|
|
{
|
|
struct iwl_priv *priv =
|
|
container_of(work, struct iwl_priv, start_internal_scan);
|
|
|
|
mutex_lock(&priv->mutex);
|
|
|
|
if (!iwl_is_ready_rf(priv)) {
|
|
IWL_DEBUG_SCAN(priv, "not ready or exit pending\n");
|
|
goto unlock;
|
|
}
|
|
|
|
if (test_bit(STATUS_SCANNING, &priv->status)) {
|
|
IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
|
|
goto unlock;
|
|
}
|
|
|
|
if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
|
|
IWL_DEBUG_SCAN(priv, "Scan request while abort pending\n");
|
|
goto unlock;
|
|
}
|
|
|
|
priv->scan_band = priv->band;
|
|
|
|
IWL_DEBUG_SCAN(priv, "Start internal short scan...\n");
|
|
set_bit(STATUS_SCANNING, &priv->status);
|
|
priv->is_internal_short_scan = true;
|
|
|
|
if (WARN_ON(!priv->cfg->ops->utils->request_scan))
|
|
goto unlock;
|
|
|
|
priv->cfg->ops->utils->request_scan(priv);
|
|
unlock:
|
|
mutex_unlock(&priv->mutex);
|
|
}
|
|
|
|
void iwl_bg_scan_check(struct work_struct *data)
|
|
{
|
|
struct iwl_priv *priv =
|
|
container_of(data, struct iwl_priv, scan_check.work);
|
|
|
|
if (test_bit(STATUS_EXIT_PENDING, &priv->status))
|
|
return;
|
|
|
|
mutex_lock(&priv->mutex);
|
|
if (test_bit(STATUS_SCANNING, &priv->status) ||
|
|
test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
|
|
IWL_DEBUG_SCAN(priv, "Scan completion watchdog resetting "
|
|
"adapter (%dms)\n",
|
|
jiffies_to_msecs(IWL_SCAN_CHECK_WATCHDOG));
|
|
|
|
if (!test_bit(STATUS_EXIT_PENDING, &priv->status))
|
|
iwl_send_scan_abort(priv);
|
|
}
|
|
mutex_unlock(&priv->mutex);
|
|
}
|
|
EXPORT_SYMBOL(iwl_bg_scan_check);
|
|
|
|
/**
|
|
* iwl_fill_probe_req - fill in all required fields and IE for probe request
|
|
*/
|
|
|
|
u16 iwl_fill_probe_req(struct iwl_priv *priv, struct ieee80211_mgmt *frame,
|
|
const u8 *ies, int ie_len, int left)
|
|
{
|
|
int len = 0;
|
|
u8 *pos = NULL;
|
|
|
|
/* Make sure there is enough space for the probe request,
|
|
* two mandatory IEs and the data */
|
|
left -= 24;
|
|
if (left < 0)
|
|
return 0;
|
|
|
|
frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
|
|
memcpy(frame->da, iwl_bcast_addr, ETH_ALEN);
|
|
memcpy(frame->sa, priv->mac_addr, ETH_ALEN);
|
|
memcpy(frame->bssid, iwl_bcast_addr, ETH_ALEN);
|
|
frame->seq_ctrl = 0;
|
|
|
|
len += 24;
|
|
|
|
/* ...next IE... */
|
|
pos = &frame->u.probe_req.variable[0];
|
|
|
|
/* fill in our indirect SSID IE */
|
|
left -= 2;
|
|
if (left < 0)
|
|
return 0;
|
|
*pos++ = WLAN_EID_SSID;
|
|
*pos++ = 0;
|
|
|
|
len += 2;
|
|
|
|
if (WARN_ON(left < ie_len))
|
|
return len;
|
|
|
|
if (ies && ie_len) {
|
|
memcpy(pos, ies, ie_len);
|
|
len += ie_len;
|
|
}
|
|
|
|
return (u16)len;
|
|
}
|
|
EXPORT_SYMBOL(iwl_fill_probe_req);
|
|
|
|
void iwl_bg_abort_scan(struct work_struct *work)
|
|
{
|
|
struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan);
|
|
|
|
if (!test_bit(STATUS_READY, &priv->status) ||
|
|
!test_bit(STATUS_GEO_CONFIGURED, &priv->status))
|
|
return;
|
|
|
|
mutex_lock(&priv->mutex);
|
|
|
|
set_bit(STATUS_SCAN_ABORTING, &priv->status);
|
|
iwl_send_scan_abort(priv);
|
|
|
|
mutex_unlock(&priv->mutex);
|
|
}
|
|
EXPORT_SYMBOL(iwl_bg_abort_scan);
|
|
|
|
void iwl_bg_scan_completed(struct work_struct *work)
|
|
{
|
|
struct iwl_priv *priv =
|
|
container_of(work, struct iwl_priv, scan_completed);
|
|
|
|
IWL_DEBUG_SCAN(priv, "SCAN complete scan\n");
|
|
|
|
cancel_delayed_work(&priv->scan_check);
|
|
|
|
if (!priv->is_internal_short_scan)
|
|
ieee80211_scan_completed(priv->hw, false);
|
|
else {
|
|
priv->is_internal_short_scan = false;
|
|
IWL_DEBUG_SCAN(priv, "internal short scan completed\n");
|
|
}
|
|
|
|
if (test_bit(STATUS_EXIT_PENDING, &priv->status))
|
|
return;
|
|
|
|
/* Since setting the TXPOWER may have been deferred while
|
|
* performing the scan, fire one off */
|
|
mutex_lock(&priv->mutex);
|
|
iwl_set_tx_power(priv, priv->tx_power_user_lmt, true);
|
|
mutex_unlock(&priv->mutex);
|
|
}
|
|
EXPORT_SYMBOL(iwl_bg_scan_completed);
|
|
|
|
void iwl_setup_scan_deferred_work(struct iwl_priv *priv)
|
|
{
|
|
INIT_WORK(&priv->scan_completed, iwl_bg_scan_completed);
|
|
INIT_WORK(&priv->abort_scan, iwl_bg_abort_scan);
|
|
INIT_WORK(&priv->start_internal_scan, iwl_bg_start_internal_scan);
|
|
INIT_DELAYED_WORK(&priv->scan_check, iwl_bg_scan_check);
|
|
}
|
|
EXPORT_SYMBOL(iwl_setup_scan_deferred_work);
|
|
|