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

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/******************************************************************************
*
* GPL LICENSE SUMMARY
*
* Copyright(c) 2008 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:
* Tomas Winkler <tomas.winkler@intel.com>
* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
*****************************************************************************/
#include <net/mac80211.h>
#include <linux/etherdevice.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 (20) /* all times in msec */
#define IWL_ACTIVE_DWELL_TIME_52 (10)
/* For faster active scanning, scan will move to the next channel if fewer than
* PLCP_QUIET_THRESH packets are heard on this channel within
* ACTIVE_QUIET_TIME after sending probe request. This shortens the dwell
* time if it's a quiet channel (nothing responded to our probe, and there's
* no other traffic).
* Disable "quiet" feature by setting PLCP_QUIET_THRESH to 0. */
#define IWL_PLCP_QUIET_THRESH __constant_cpu_to_le16(1) /* packets */
#define IWL_ACTIVE_QUIET_TIME __constant_cpu_to_le16(5) /* msec */
/* 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
static int scan_tx_ant[3] = {
RATE_MCS_ANT_A_MSK, RATE_MCS_ANT_B_MSK, RATE_MCS_ANT_C_MSK
};
static int iwl_is_empty_essid(const char *essid, int essid_len)
{
/* Single white space is for Linksys APs */
if (essid_len == 1 && essid[0] == ' ')
return 1;
/* Otherwise, if the entire essid is 0, we assume it is hidden */
while (essid_len) {
essid_len--;
if (essid[essid_len] != '\0')
return 0;
}
return 1;
}
const char *iwl_escape_essid(const char *essid, u8 essid_len)
{
static char escaped[IW_ESSID_MAX_SIZE * 2 + 1];
const char *s = essid;
char *d = escaped;
if (iwl_is_empty_essid(essid, essid_len)) {
memcpy(escaped, "<hidden>", sizeof("<hidden>"));
return escaped;
}
essid_len = min(essid_len, (u8) IW_ESSID_MAX_SIZE);
while (essid_len--) {
if (*s == '\0') {
*d++ = '\\';
*d++ = '0';
s++;
} else
*d++ = *s++;
}
*d = '\0';
return escaped;
}
EXPORT_SYMBOL(iwl_escape_essid);
/**
* 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_bit(STATUS_SCAN_ABORTING, &priv->status)) {
IWL_DEBUG_SCAN("Queuing scan abort.\n");
set_bit(STATUS_SCAN_ABORTING, &priv->status);
queue_work(priv->workqueue, &priv->abort_scan);
} else
IWL_DEBUG_SCAN("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 *res;
struct iwl_host_cmd cmd = {
.id = REPLY_SCAN_ABORT_CMD,
.meta.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;
}
res = (struct iwl_rx_packet *)cmd.meta.u.skb->data;
if (res->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("SCAN_ABORT returned %d.\n", res->u.status);
clear_bit(STATUS_SCAN_ABORTING, &priv->status);
clear_bit(STATUS_SCAN_HW, &priv->status);
}
dev_kfree_skb_any(cmd.meta.u.skb);
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 = (struct iwl_rx_packet *)rxb->skb->data;
struct iwl_scanreq_notification *notif =
(struct iwl_scanreq_notification *)pkt->u.raw;
IWL_DEBUG_RX("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 = (struct iwl_rx_packet *)rxb->skb->data;
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("Scan start: "
"%d [802.11%s] "
"(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n",
notif->channel,
notif->band ? "bg" : "a",
notif->tsf_high,
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 = (struct iwl_rx_packet *)rxb->skb->data;
struct iwl_scanresults_notification *notif =
(struct iwl_scanresults_notification *)pkt->u.raw;
IWL_DEBUG_SCAN("Scan ch.res: "
"%d [802.11%s] "
"(TSF: 0x%08X:%08X) - %d "
"elapsed=%lu usec (%dms since last)\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,
jiffies_to_msecs(elapsed_jiffies
(priv->last_scan_jiffies, jiffies)));
#endif
priv->last_scan_jiffies = jiffies;
priv->next_scan_jiffies = 0;
}
/* Service SCAN_COMPLETE_NOTIFICATION (0x84) */
static void iwl_rx_scan_complete_notif(struct iwl_priv *priv,
struct iwl_rx_mem_buffer *rxb)
{
struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
struct iwl_scancomplete_notification *scan_notif = (void *)pkt->u.raw;
IWL_DEBUG_SCAN("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);
/* The HW is no longer scanning */
clear_bit(STATUS_SCAN_HW, &priv->status);
/* The scan completion notification came in, so kill that timer... */
cancel_delayed_work(&priv->scan_check);
IWL_DEBUG_INFO("Scan pass on %sGHz took %dms\n",
(priv->scan_bands == 2) ? "2.4" : "5.2",
jiffies_to_msecs(elapsed_jiffies
(priv->scan_pass_start, jiffies)));
/* Remove this scanned band from the list
* of pending bands to scan */
priv->scan_bands--;
/* 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_bit(STATUS_SCAN_ABORTING, &priv->status)) {
IWL_DEBUG_INFO("Aborted scan completed.\n");
clear_bit(STATUS_SCAN_ABORTING, &priv->status);
} else {
/* If there are more bands on this scan pass reschedule */
if (priv->scan_bands > 0)
goto reschedule;
}
priv->last_scan_jiffies = jiffies;
priv->next_scan_jiffies = 0;
IWL_DEBUG_INFO("Setting scan to off\n");
clear_bit(STATUS_SCANNING, &priv->status);
IWL_DEBUG_INFO("Scan took %dms\n",
jiffies_to_msecs(elapsed_jiffies(priv->scan_start, jiffies)));
queue_work(priv->workqueue, &priv->scan_completed);
return;
reschedule:
priv->scan_pass_start = jiffies;
queue_work(priv->workqueue, &priv->request_scan);
}
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);
static inline u16 iwl_get_active_dwell_time(struct iwl_priv *priv,
enum ieee80211_band band)
{
if (band == IEEE80211_BAND_5GHZ)
return IWL_ACTIVE_DWELL_TIME_52;
else
return IWL_ACTIVE_DWELL_TIME_24;
}
static u16 iwl_get_passive_dwell_time(struct iwl_priv *priv,
enum ieee80211_band band)
{
u16 active = iwl_get_active_dwell_time(priv, band);
u16 passive = (band != IEEE80211_BAND_5GHZ) ?
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;
}
if (passive <= active)
passive = active + 1;
return passive;
}
static int iwl_get_channels_for_scan(struct iwl_priv *priv,
enum ieee80211_band band,
u8 is_active, u8 direct_mask,
struct iwl_scan_channel *scan_ch)
{
const struct ieee80211_channel *channels = NULL;
const struct ieee80211_supported_band *sband;
const struct iwl_channel_info *ch_info;
u16 passive_dwell = 0;
u16 active_dwell = 0;
int added, i;
sband = iwl_get_hw_mode(priv, band);
if (!sband)
return 0;
channels = sband->channels;
active_dwell = iwl_get_active_dwell_time(priv, band);
passive_dwell = iwl_get_passive_dwell_time(priv, band);
for (i = 0, added = 0; i < sband->n_channels; i++) {
if (channels[i].flags & IEEE80211_CHAN_DISABLED)
continue;
scan_ch->channel =
ieee80211_frequency_to_channel(channels[i].center_freq);
ch_info = iwl_get_channel_info(priv, band, scan_ch->channel);
if (!is_channel_valid(ch_info)) {
IWL_DEBUG_SCAN("Channel %d is INVALID for this SKU.\n",
scan_ch->channel);
continue;
}
if (!is_active || is_channel_passive(ch_info) ||
(channels[i].flags & IEEE80211_CHAN_PASSIVE_SCAN))
scan_ch->type = 0;
else
scan_ch->type = 1;
if (scan_ch->type & 1)
scan_ch->type |= (direct_mask << 1);
scan_ch->active_dwell = cpu_to_le16(active_dwell);
scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
/* Set txpower levels to defaults */
scan_ch->dsp_atten = 110;
if (band == IEEE80211_BAND_5GHZ)
scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
else {
scan_ch->tx_gain = ((1 << 5) | (5 << 3));
/* NOTE: if we were doing 6Mb OFDM for scans we'd use
* power level:
* scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3;
*/
}
IWL_DEBUG_SCAN("Scanning %d [%s %d]\n",
scan_ch->channel,
(scan_ch->type & 1) ? "ACTIVE" : "PASSIVE",
(scan_ch->type & 1) ?
active_dwell : passive_dwell);
scan_ch++;
added++;
}
IWL_DEBUG_SCAN("total channels to scan %d \n", added);
return added;
}
void iwl_init_scan_params(struct iwl_priv *priv)
{
if (!priv->scan_tx_ant[IEEE80211_BAND_5GHZ])
priv->scan_tx_ant[IEEE80211_BAND_5GHZ] = RATE_MCS_ANT_INIT_IND;
if (!priv->scan_tx_ant[IEEE80211_BAND_2GHZ])
priv->scan_tx_ant[IEEE80211_BAND_2GHZ] = RATE_MCS_ANT_INIT_IND;
}
int iwl_scan_initiate(struct iwl_priv *priv)
{
if (priv->iw_mode == IEEE80211_IF_TYPE_AP) {
IWL_ERROR("APs don't scan.\n");
return 0;
}
if (!iwl_is_ready_rf(priv)) {
IWL_DEBUG_SCAN("Aborting scan due to not ready.\n");
return -EIO;
}
if (test_bit(STATUS_SCANNING, &priv->status)) {
IWL_DEBUG_SCAN("Scan already in progress.\n");
return -EAGAIN;
}
if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
IWL_DEBUG_SCAN("Scan request while abort pending. "
"Queuing.\n");
return -EAGAIN;
}
IWL_DEBUG_INFO("Starting scan...\n");
priv->scan_bands = 2;
set_bit(STATUS_SCANNING, &priv->status);
priv->scan_start = jiffies;
priv->scan_pass_start = priv->scan_start;
queue_work(priv->workqueue, &priv->request_scan);
return 0;
}
EXPORT_SYMBOL(iwl_scan_initiate);
#define IWL_SCAN_CHECK_WATCHDOG (7 * HZ)
static 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(IWL_DL_SCAN, "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);
}
/**
* iwl_supported_rate_to_ie - fill in the supported rate in IE field
*
* return : set the bit for each supported rate insert in ie
*/
static u16 iwl_supported_rate_to_ie(u8 *ie, u16 supported_rate,
u16 basic_rate, int *left)
{
u16 ret_rates = 0, bit;
int i;
u8 *cnt = ie;
u8 *rates = ie + 1;
for (bit = 1, i = 0; i < IWL_RATE_COUNT; i++, bit <<= 1) {
if (bit & supported_rate) {
ret_rates |= bit;
rates[*cnt] = iwl_rates[i].ieee |
((bit & basic_rate) ? 0x80 : 0x00);
(*cnt)++;
(*left)--;
if ((*left <= 0) ||
(*cnt >= IWL_SUPPORTED_RATES_IE_LEN))
break;
}
}
return ret_rates;
}
static void iwl_ht_cap_to_ie(const struct ieee80211_supported_band *sband,
u8 *pos, int *left)
{
struct ieee80211_ht_cap *ht_cap;
if (!sband || !sband->ht_info.ht_supported)
return;
if (*left < sizeof(struct ieee80211_ht_cap))
return;
*pos++ = sizeof(struct ieee80211_ht_cap);
ht_cap = (struct ieee80211_ht_cap *) pos;
ht_cap->cap_info = cpu_to_le16(sband->ht_info.cap);
memcpy(ht_cap->supp_mcs_set, sband->ht_info.supp_mcs_set, 16);
ht_cap->ampdu_params_info =
(sband->ht_info.ampdu_factor & IEEE80211_HT_CAP_AMPDU_FACTOR) |
((sband->ht_info.ampdu_density << 2) &
IEEE80211_HT_CAP_AMPDU_DENSITY);
*left -= sizeof(struct ieee80211_ht_cap);
}
/**
* iwl_fill_probe_req - fill in all required fields and IE for probe request
*/
static u16 iwl_fill_probe_req(struct iwl_priv *priv,
enum ieee80211_band band,
struct ieee80211_mgmt *frame,
int left)
{
int len = 0;
u8 *pos = NULL;
u16 active_rates, ret_rates, cck_rates, active_rate_basic;
const struct ieee80211_supported_band *sband =
iwl_get_hw_mode(priv, band);
/* 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;
/* fill in supported rate */
left -= 2;
if (left < 0)
return 0;
*pos++ = WLAN_EID_SUPP_RATES;
*pos = 0;
/* exclude 60M rate */
active_rates = priv->rates_mask;
active_rates &= ~IWL_RATE_60M_MASK;
active_rate_basic = active_rates & IWL_BASIC_RATES_MASK;
cck_rates = IWL_CCK_RATES_MASK & active_rates;
ret_rates = iwl_supported_rate_to_ie(pos, cck_rates,
active_rate_basic, &left);
active_rates &= ~ret_rates;
ret_rates = iwl_supported_rate_to_ie(pos, active_rates,
active_rate_basic, &left);
active_rates &= ~ret_rates;
len += 2 + *pos;
pos += (*pos) + 1;
if (active_rates == 0)
goto fill_end;
/* fill in supported extended rate */
/* ...next IE... */
left -= 2;
if (left < 0)
return 0;
/* ... fill it in... */
*pos++ = WLAN_EID_EXT_SUPP_RATES;
*pos = 0;
iwl_supported_rate_to_ie(pos, active_rates, active_rate_basic, &left);
if (*pos > 0) {
len += 2 + *pos;
pos += (*pos) + 1;
} else {
pos--;
}
fill_end:
left -= 2;
if (left < 0)
return 0;
*pos++ = WLAN_EID_HT_CAPABILITY;
*pos = 0;
iwl_ht_cap_to_ie(sband, pos, &left);
if (*pos > 0)
len += 2 + *pos;
return (u16)len;
}
static u32 iwl_scan_tx_ant(struct iwl_priv *priv, enum ieee80211_band band)
{
int i, ind;
ind = priv->scan_tx_ant[band];
for (i = 0; i < priv->hw_params.tx_chains_num; i++) {
ind = (ind+1) >= priv->hw_params.tx_chains_num ? 0 : ind+1;
if (priv->hw_params.valid_tx_ant & (1 << ind)) {
priv->scan_tx_ant[band] = ind;
break;
}
}
return scan_tx_ant[ind];
}
static void iwl_bg_request_scan(struct work_struct *data)
{
struct iwl_priv *priv =
container_of(data, struct iwl_priv, request_scan);
struct iwl_host_cmd cmd = {
.id = REPLY_SCAN_CMD,
.len = sizeof(struct iwl_scan_cmd),
.meta.flags = CMD_SIZE_HUGE,
};
struct iwl_scan_cmd *scan;
struct ieee80211_conf *conf = NULL;
int ret = 0;
u32 tx_ant;
u16 cmd_len;
enum ieee80211_band band;
u8 direct_mask;
u8 rx_chain = 0x7; /* bitmap: ABC chains */
conf = ieee80211_get_hw_conf(priv->hw);
mutex_lock(&priv->mutex);
if (!iwl_is_ready(priv)) {
IWL_WARNING("request scan called when driver not ready.\n");
goto done;
}
/* Make sure the scan wasn't cancelled before this queued work
* was given the chance to run... */
if (!test_bit(STATUS_SCANNING, &priv->status))
goto done;
/* This should never be called or scheduled if there is currently
* a scan active in the hardware. */
if (test_bit(STATUS_SCAN_HW, &priv->status)) {
IWL_DEBUG_INFO("Multiple concurrent scan requests in parallel. "
"Ignoring second request.\n");
ret = -EIO;
goto done;
}
if (test_bit(STATUS_EXIT_PENDING, &priv->status)) {
IWL_DEBUG_SCAN("Aborting scan due to device shutdown\n");
goto done;
}
if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
IWL_DEBUG_HC("Scan request while abort pending. Queuing.\n");
goto done;
}
if (iwl_is_rfkill(priv)) {
IWL_DEBUG_HC("Aborting scan due to RF Kill activation\n");
goto done;
}
if (!test_bit(STATUS_READY, &priv->status)) {
IWL_DEBUG_HC("Scan request while uninitialized. Queuing.\n");
goto done;
}
if (!priv->scan_bands) {
IWL_DEBUG_HC("Aborting scan due to no requested bands\n");
goto done;
}
if (!priv->scan) {
priv->scan = kmalloc(sizeof(struct iwl_scan_cmd) +
IWL_MAX_SCAN_SIZE, GFP_KERNEL);
if (!priv->scan) {
ret = -ENOMEM;
goto done;
}
}
scan = priv->scan;
memset(scan, 0, sizeof(struct iwl_scan_cmd) + IWL_MAX_SCAN_SIZE);
scan->quiet_plcp_th = IWL_PLCP_QUIET_THRESH;
scan->quiet_time = IWL_ACTIVE_QUIET_TIME;
if (iwl_is_associated(priv)) {
u16 interval = 0;
u32 extra;
u32 suspend_time = 100;
u32 scan_suspend_time = 100;
unsigned long flags;
IWL_DEBUG_INFO("Scanning while associated...\n");
spin_lock_irqsave(&priv->lock, flags);
interval = priv->beacon_int;
spin_unlock_irqrestore(&priv->lock, flags);
scan->suspend_time = 0;
scan->max_out_time = cpu_to_le32(200 * 1024);
if (!interval)
interval = suspend_time;
extra = (suspend_time / interval) << 22;
scan_suspend_time = (extra |
((suspend_time % interval) * 1024));
scan->suspend_time = cpu_to_le32(scan_suspend_time);
IWL_DEBUG_SCAN("suspend_time 0x%X beacon interval %d\n",
scan_suspend_time, interval);
}
/* We should add the ability for user to lock to PASSIVE ONLY */
if (priv->one_direct_scan) {
IWL_DEBUG_SCAN("Start direct scan for '%s'\n",
iwl_escape_essid(priv->direct_ssid,
priv->direct_ssid_len));
scan->direct_scan[0].id = WLAN_EID_SSID;
scan->direct_scan[0].len = priv->direct_ssid_len;
memcpy(scan->direct_scan[0].ssid,
priv->direct_ssid, priv->direct_ssid_len);
direct_mask = 1;
} else if (!iwl_is_associated(priv) && priv->essid_len) {
IWL_DEBUG_SCAN("Start direct scan for '%s' (not associated)\n",
iwl_escape_essid(priv->essid, priv->essid_len));
scan->direct_scan[0].id = WLAN_EID_SSID;
scan->direct_scan[0].len = priv->essid_len;
memcpy(scan->direct_scan[0].ssid, priv->essid, priv->essid_len);
direct_mask = 1;
} else {
IWL_DEBUG_SCAN("Start indirect scan.\n");
direct_mask = 0;
}
scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK;
scan->tx_cmd.sta_id = priv->hw_params.bcast_sta_id;
scan->tx_cmd.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
switch (priv->scan_bands) {
case 2:
band = IEEE80211_BAND_2GHZ;
scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK;
tx_ant = iwl_scan_tx_ant(priv, band);
if (priv->active_rxon.flags & RXON_FLG_CHANNEL_MODE_PURE_40_MSK)
scan->tx_cmd.rate_n_flags =
iwl_hw_set_rate_n_flags(IWL_RATE_6M_PLCP,
tx_ant);
else
scan->tx_cmd.rate_n_flags =
iwl_hw_set_rate_n_flags(IWL_RATE_1M_PLCP,
tx_ant |
RATE_MCS_CCK_MSK);
scan->good_CRC_th = 0;
break;
case 1:
band = IEEE80211_BAND_5GHZ;
tx_ant = iwl_scan_tx_ant(priv, band);
scan->tx_cmd.rate_n_flags =
iwl_hw_set_rate_n_flags(IWL_RATE_6M_PLCP,
tx_ant);
scan->good_CRC_th = IWL_GOOD_CRC_TH;
/* Force use of chains B and C (0x6) for scan Rx for 4965
* Avoid A (0x1) because of its off-channel reception on A-band.
* MIMO is not used here, but value is required */
if ((priv->hw_rev & CSR_HW_REV_TYPE_MSK) == CSR_HW_REV_TYPE_4965)
rx_chain = 0x6;
break;
default:
IWL_WARNING("Invalid scan band count\n");
goto done;
}
scan->rx_chain = RXON_RX_CHAIN_DRIVER_FORCE_MSK |
cpu_to_le16((0x7 << RXON_RX_CHAIN_VALID_POS) |
(rx_chain << RXON_RX_CHAIN_FORCE_SEL_POS) |
(0x7 << RXON_RX_CHAIN_FORCE_MIMO_SEL_POS));
cmd_len = iwl_fill_probe_req(priv, band,
(struct ieee80211_mgmt *)scan->data,
IWL_MAX_SCAN_SIZE - sizeof(*scan));
scan->tx_cmd.len = cpu_to_le16(cmd_len);
if (priv->iw_mode == IEEE80211_IF_TYPE_MNTR)
scan->filter_flags = RXON_FILTER_PROMISC_MSK;
scan->filter_flags |= (RXON_FILTER_ACCEPT_GRP_MSK |
RXON_FILTER_BCON_AWARE_MSK);
if (direct_mask)
scan->channel_count =
iwl_get_channels_for_scan(priv, band, 1, /* active */
direct_mask,
(void *)&scan->data[le16_to_cpu(scan->tx_cmd.len)]);
else
scan->channel_count =
iwl_get_channels_for_scan(priv, band, 0, /* passive */
direct_mask,
(void *)&scan->data[le16_to_cpu(scan->tx_cmd.len)]);
if (scan->channel_count == 0) {
IWL_DEBUG_SCAN("channel count %d\n", scan->channel_count);
goto done;
}
cmd.len += le16_to_cpu(scan->tx_cmd.len) +
scan->channel_count * sizeof(struct iwl_scan_channel);
cmd.data = scan;
scan->len = cpu_to_le16(cmd.len);
set_bit(STATUS_SCAN_HW, &priv->status);
ret = iwl_send_cmd_sync(priv, &cmd);
if (ret)
goto done;
queue_delayed_work(priv->workqueue, &priv->scan_check,
IWL_SCAN_CHECK_WATCHDOG);
mutex_unlock(&priv->mutex);
return;
done:
/* inform mac80211 scan aborted */
queue_work(priv->workqueue, &priv->scan_completed);
mutex_unlock(&priv->mutex);
}
static void iwl_bg_abort_scan(struct work_struct *work)
{
struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan);
if (!iwl_is_ready(priv))
return;
mutex_lock(&priv->mutex);
set_bit(STATUS_SCAN_ABORTING, &priv->status);
iwl_send_scan_abort(priv);
mutex_unlock(&priv->mutex);
}
void iwl_setup_scan_deferred_work(struct iwl_priv *priv)
{
/* FIXME: move here when resolved PENDING
* INIT_WORK(&priv->scan_completed, iwl_bg_scan_completed); */
INIT_WORK(&priv->request_scan, iwl_bg_request_scan);
INIT_WORK(&priv->abort_scan, iwl_bg_abort_scan);
INIT_DELAYED_WORK(&priv->scan_check, iwl_bg_scan_check);
}
EXPORT_SYMBOL(iwl_setup_scan_deferred_work);
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