- 根目录:
- drivers
- net
- wireless
- iwlwifi
- dvm
- scan.c
/******************************************************************************
*
* GPL LICENSE SUMMARY
*
* Copyright(c) 2008 - 2014 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 COPYING.
*
* 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 "dev.h"
#include "agn.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
#define MAX_SCAN_CHANNEL 50
/* For reset radio, need minimal dwell time only */
#define IWL_RADIO_RESET_DWELL_TIME 5
static int iwl_send_scan_abort(struct iwl_priv *priv)
{
int ret;
struct iwl_host_cmd cmd = {
.id = REPLY_SCAN_ABORT_CMD,
.flags = CMD_SYNC | CMD_WANT_SKB,
};
__le32 *status;
/* Exit instantly with error when device is not ready
* to receive scan abort command or it does not perform
* hardware scan currently */
if (!test_bit(STATUS_READY, &priv->status) ||
!test_bit(STATUS_SCAN_HW, &priv->status) ||
test_bit(STATUS_FW_ERROR, &priv->status))
return -EIO;
ret = iwl_dvm_send_cmd(priv, &cmd);
if (ret)
return ret;
status = (void *)cmd.resp_pkt->data;
if (*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_SCAN(priv, "SCAN_ABORT ret %d.\n",
le32_to_cpu(*status));
ret = -EIO;
}
iwl_free_resp(&cmd);
return ret;
}
static void iwl_complete_scan(struct iwl_priv *priv, bool aborted)
{
/* check if scan was requested from mac80211 */
if (priv->scan_request) {
IWL_DEBUG_SCAN(priv, "Complete scan in mac80211\n");
ieee80211_scan_completed(priv->hw, aborted);
}
priv->scan_type = IWL_SCAN_NORMAL;
priv->scan_vif = NULL;
priv->scan_request = NULL;
}
static void iwl_process_scan_complete(struct iwl_priv *priv)
{
bool aborted;
lockdep_assert_held(&priv->mutex);
if (!test_and_clear_bit(STATUS_SCAN_COMPLETE, &priv->status))
return;
IWL_DEBUG_SCAN(priv, "Completed scan.\n");
cancel_delayed_work(&priv->scan_check);
aborted = test_and_clear_bit(STATUS_SCAN_ABORTING, &priv->status);
if (aborted)
IWL_DEBUG_SCAN(priv, "Aborted scan completed.\n");
if (!test_and_clear_bit(STATUS_SCANNING, &priv->status)) {
IWL_DEBUG_SCAN(priv, "Scan already completed.\n");
goto out_settings;
}
if (priv->scan_type != IWL_SCAN_NORMAL && !aborted) {
int err;
/* Check if mac80211 requested scan during our internal scan */
if (priv->scan_request == NULL)
goto out_complete;
/* If so request a new scan */
err = iwl_scan_initiate(priv, priv->scan_vif, IWL_SCAN_NORMAL,
priv->scan_request->channels[0]->band);
if (err) {
IWL_DEBUG_SCAN(priv,
"failed to initiate pending scan: %d\n", err);
aborted = true;
goto out_complete;
}
return;
}
out_complete:
iwl_complete_scan(priv, aborted);
out_settings:
/* Can we still talk to firmware ? */
if (!iwl_is_ready_rf(priv))
return;
iwlagn_post_scan(priv);
}
void iwl_force_scan_end(struct iwl_priv *priv)
{
lockdep_assert_held(&priv->mutex);
if (!test_bit(STATUS_SCANNING, &priv->status)) {
IWL_DEBUG_SCAN(priv, "Forcing scan end while not scanning\n");
return;
}
IWL_DEBUG_SCAN(priv, "Forcing scan end\n");
clear_bit(STATUS_SCANNING, &priv->status);
clear_bit(STATUS_SCAN_HW, &priv->status);
clear_bit(STATUS_SCAN_ABORTING, &priv->status);
clear_bit(STATUS_SCAN_COMPLETE, &priv->status);
iwl_complete_scan(priv, true);
}
static void iwl_do_scan_abort(struct iwl_priv *priv)
{
int ret;
lockdep_assert_held(&priv->mutex);
if (!test_bit(STATUS_SCANNING, &priv->status)) {
IWL_DEBUG_SCAN(priv, "Not performing scan to abort\n");
return;
}
if (test_and_set_bit(STATUS_SCAN_ABORTING, &priv->status)) {
IWL_DEBUG_SCAN(priv, "Scan abort in progress\n");
return;
}
ret = iwl_send_scan_abort(priv);
if (ret) {
IWL_DEBUG_SCAN(priv, "Send scan abort failed %d\n", ret);
iwl_force_scan_end(priv);
} else
IWL_DEBUG_SCAN(priv, "Successfully send scan abort\n");
}
/**
* iwl_scan_cancel - Cancel any currently executing HW scan
*/
int iwl_scan_cancel(struct iwl_priv *priv)
{
IWL_DEBUG_SCAN(priv, "Queuing abort scan\n");
queue_work(priv->workqueue, &priv->abort_scan);
return 0;
}
/**
* iwl_scan_cancel_timeout - Cancel any currently executing HW scan
* @ms: amount of time to wait (in milliseconds) for scan to abort
*
*/
void iwl_scan_cancel_timeout(struct iwl_priv *priv, unsigned long ms)
{
unsigned long timeout = jiffies + msecs_to_jiffies(ms);
lockdep_assert_held(&priv->mutex);
IWL_DEBUG_SCAN(priv, "Scan cancel timeout\n");
iwl_do_scan_abort(priv);
while (time_before_eq(jiffies, timeout)) {
if (!test_bit(STATUS_SCAN_HW, &priv->status))
goto finished;
msleep(20);
}
return;
finished:
/*
* Now STATUS_SCAN_HW is clear. This means that the
* device finished, but the background work is going
* to execute at best as soon as we release the mutex.
* Since we need to be able to issue a new scan right
* after this function returns, run the complete here.
* The STATUS_SCAN_COMPLETE bit will then be cleared
* and prevent the background work from "completing"
* a possible new scan.
*/
iwl_process_scan_complete(priv);
}
/* Service response to REPLY_SCAN_CMD (0x80) */
static int iwl_rx_reply_scan(struct iwl_priv *priv,
struct iwl_rx_cmd_buffer *rxb,
struct iwl_device_cmd *cmd)
{
#ifdef CONFIG_IWLWIFI_DEBUG
struct iwl_rx_packet *pkt = rxb_addr(rxb);
struct iwl_scanreq_notification *notif = (void *)pkt->data;
IWL_DEBUG_SCAN(priv, "Scan request status = 0x%x\n", notif->status);
#endif
return 0;
}
/* Service SCAN_START_NOTIFICATION (0x82) */
static int iwl_rx_scan_start_notif(struct iwl_priv *priv,
struct iwl_rx_cmd_buffer *rxb,
struct iwl_device_cmd *cmd)
{
struct iwl_rx_packet *pkt = rxb_addr(rxb);
struct iwl_scanstart_notification *notif = (void *)pkt->data;
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);
return 0;
}
/* Service SCAN_RESULTS_NOTIFICATION (0x83) */
static int iwl_rx_scan_results_notif(struct iwl_priv *priv,
struct iwl_rx_cmd_buffer *rxb,
struct iwl_device_cmd *cmd)
{
#ifdef CONFIG_IWLWIFI_DEBUG
struct iwl_rx_packet *pkt = rxb_addr(rxb);
struct iwl_scanresults_notification *notif = (void *)pkt->data;
IWL_DEBUG_SCAN(priv, "Scan ch.res: "
"%d [802.11%s] "
"probe status: %u:%u "
"(TSF: 0x%08X:%08X) - %d "
"elapsed=%lu usec\n",
notif->channel,
notif->band ? "bg" : "a",
notif->probe_status, notif->num_probe_not_sent,
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
return 0;
}
/* Service SCAN_COMPLETE_NOTIFICATION (0x84) */
static int iwl_rx_scan_complete_notif(struct iwl_priv *priv,
struct iwl_rx_cmd_buffer *rxb,
struct iwl_device_cmd *cmd)
{
struct iwl_rx_packet *pkt = rxb_addr(rxb);
struct iwl_scancomplete_notification *scan_notif = (void *)pkt->data;
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);
IWL_DEBUG_SCAN(priv, "Scan on %sGHz took %dms\n",
(priv->scan_band == IEEE80211_BAND_2GHZ) ? "2.4" : "5.2",
jiffies_to_msecs(jiffies - priv->scan_start));
/*
* When aborting, we run the scan completed background work inline
* and the background work must then do nothing. The SCAN_COMPLETE
* bit helps implement that logic and thus needs to be set before
* queueing the work. Also, since the scan abort waits for SCAN_HW
* to clear, we need to set SCAN_COMPLETE before clearing SCAN_HW
* to avoid a race there.
*/
set_bit(STATUS_SCAN_COMPLETE, &priv->status);
clear_bit(STATUS_SCAN_HW, &priv->status);
queue_work(priv->workqueue, &priv->scan_completed);
if (priv->iw_mode != NL80211_IFTYPE_ADHOC &&
iwl_advanced_bt_coexist(priv) &&
priv->bt_status != scan_notif->bt_status) {
if (scan_notif->bt_status) {
/* BT on */
if (!priv->bt_ch_announce)
priv->bt_traffic_load =
IWL_BT_COEX_TRAFFIC_LOAD_HIGH;
/*
* otherwise, no traffic load information provided
* no changes made
*/
} else {
/* BT off */
priv->bt_traffic_load =
IWL_BT_COEX_TRAFFIC_LOAD_NONE;
}
priv->bt_status = scan_notif->bt_status;
queue_work(priv->workqueue,
&priv->bt_traffic_change_work);
}
return 0;
}
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;
}
static 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);
}
static u16 iwl_limit_dwell(struct iwl_priv *priv, u16 dwell_time)
{
struct iwl_rxon_context *ctx;
int limits[NUM_IWL_RXON_CTX] = {};
int n_active = 0;
u16 limit;
BUILD_BUG_ON(NUM_IWL_RXON_CTX != 2);
/*
* If we're associated, we clamp the dwell time 98%
* of the beacon interval (minus 2 * channel tune time)
* If both contexts are active, we have to restrict to
* 1/2 of the minimum of them, because they might be in
* lock-step with the time inbetween only half of what
* time we'd have in each of them.
*/
for_each_context(priv, ctx) {
switch (ctx->staging.dev_type) {
case RXON_DEV_TYPE_P2P:
/* no timing constraints */
continue;
case RXON_DEV_TYPE_ESS:
default:
/* timing constraints if associated */
if (!iwl_is_associated_ctx(ctx))
continue;
break;
case RXON_DEV_TYPE_CP:
case RXON_DEV_TYPE_2STA:
/*
* These seem to always have timers for TBTT
* active in uCode even when not associated yet.
*/
break;
}
limits[n_active++] = ctx->beacon_int ?: IWL_PASSIVE_DWELL_BASE;
}
switch (n_active) {
case 0:
return dwell_time;
case 2:
limit = (limits[1] * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
limit /= 2;
dwell_time = min(limit, dwell_time);
/* fall through to limit further */
case 1:
limit = (limits[0] * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
limit /= n_active;
return min(limit, dwell_time);
default:
WARN_ON_ONCE(1);
return dwell_time;
}
}
static 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;
return iwl_limit_dwell(priv, passive);
}
/* Return valid, unused, channel for a passive scan to reset the RF */
static u8 iwl_get_single_channel_number(struct iwl_priv *priv,
enum ieee80211_band band)
{
struct ieee80211_supported_band *sband = priv->hw->wiphy->bands[band];
struct iwl_rxon_context *ctx;
int i;
for (i = 0; i < sband->n_channels; i++) {
bool busy = false;
for_each_context(priv, ctx) {
busy = sband->channels[i].hw_value ==
le16_to_cpu(ctx->staging.channel);
if (busy)
break;
}
if (busy)
continue;
if (!(sband->channels[i].flags & IEEE80211_CHAN_DISABLED))
return sband->channels[i].hw_value;
}
return 0;
}
static int iwl_get_channel_for_reset_scan(struct iwl_priv *priv,
struct ieee80211_vif *vif,
enum ieee80211_band band,
struct iwl_scan_channel *scan_ch)
{
const struct ieee80211_supported_band *sband;
u16 channel;
sband = iwl_get_hw_mode(priv, band);
if (!sband) {
IWL_ERR(priv, "invalid band\n");
return 0;
}
channel = iwl_get_single_channel_number(priv, band);
if (channel) {
scan_ch->channel = cpu_to_le16(channel);
scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
scan_ch->active_dwell =
cpu_to_le16(IWL_RADIO_RESET_DWELL_TIME);
scan_ch->passive_dwell =
cpu_to_le16(IWL_RADIO_RESET_DWELL_TIME);
/* 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));
return 1;
}
IWL_ERR(priv, "no valid channel found\n");
return 0;
}
static int iwl_get_channels_for_scan(struct iwl_priv *priv,
struct ieee80211_vif *vif,
enum ieee80211_band band,
u8 is_active, u8 n_probes,
struct iwl_scan_channel *scan_ch)
{
struct ieee80211_channel *chan;
const struct ieee80211_supported_band *sband;
u16 passive_dwell = 0;
u16 active_dwell = 0;
int added, i;
u16 channel;
sband = iwl_get_hw_mode(priv, band);
if (!sband)
return 0;
active_dwell = iwl_get_active_dwell_time(priv, band, n_probes);
passive_dwell = iwl_get_passive_dwell_time(priv, band);
if (passive_dwell <= active_dwell)
passive_dwell = active_dwell + 1;
for (i = 0, added = 0; i < priv->scan_request->n_channels; i++) {
chan = priv->scan_request->channels[i];
if (chan->band != band)
continue;
channel = chan->hw_value;
scan_ch->channel = cpu_to_le16(channel);
if (!is_active || (chan->flags & IEEE80211_CHAN_NO_IR))
scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
else
scan_ch->type = SCAN_CHANNEL_TYPE_ACTIVE;
if (n_probes)
scan_ch->type |= IWL_SCAN_PROBE_MASK(n_probes);
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;
/* NOTE: if we were doing 6Mb OFDM for scans we'd use
* power level:
* scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3;
*/
if (band == IEEE80211_BAND_5GHZ)
scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
else
scan_ch->tx_gain = ((1 << 5) | (5 << 3));
IWL_DEBUG_SCAN(priv, "Scanning ch=%d prob=0x%X [%s %d]\n",
channel, le32_to_cpu(scan_ch->type),
(scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
"ACTIVE" : "PASSIVE",
(scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
active_dwell : passive_dwell);
scan_ch++;
added++;
}
IWL_DEBUG_SCAN(priv, "total channels to scan %d\n", added);
return added;
}
/**
* iwl_fill_probe_req - fill in all required fields and IE for probe request
*/
static u16 iwl_fill_probe_req(struct ieee80211_mgmt *frame, const u8 *ta,
const u8 *ies, int ie_len, const u8 *ssid,
u8 ssid_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);
eth_broadcast_addr(frame->da);
memcpy(frame->sa, ta, ETH_ALEN);
eth_broadcast_addr(frame->bssid);
frame->seq_ctrl = 0;
len += 24;
/* ...next IE... */
pos = &frame->u.probe_req.variable[0];
/* fill in our SSID IE */
left -= ssid_len + 2;
if (left < 0)
return 0;
*pos++ = WLAN_EID_SSID;
*pos++ = ssid_len;
if (ssid && ssid_len) {
memcpy(pos, ssid, ssid_len);
pos += ssid_len;
}
len += ssid_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;
}
static int iwlagn_request_scan(struct iwl_priv *priv, struct ieee80211_vif *vif)
{
struct iwl_host_cmd cmd = {
.id = REPLY_SCAN_CMD,
.len = { sizeof(struct iwl_scan_cmd), },
.flags = CMD_SYNC,
};
struct iwl_scan_cmd *scan;
struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
u32 rate_flags = 0;
u16 cmd_len = 0;
u16 rx_chain = 0;
enum ieee80211_band band;
u8 n_probes = 0;
u8 rx_ant = priv->nvm_data->valid_rx_ant;
u8 rate;
bool is_active = false;
int chan_mod;
u8 active_chains;
u8 scan_tx_antennas = priv->nvm_data->valid_tx_ant;
int ret;
int scan_cmd_size = sizeof(struct iwl_scan_cmd) +
MAX_SCAN_CHANNEL * sizeof(struct iwl_scan_channel) +
priv->fw->ucode_capa.max_probe_length;
const u8 *ssid = NULL;
u8 ssid_len = 0;
if (WARN_ON(priv->scan_type == IWL_SCAN_NORMAL &&
(!priv->scan_request ||
priv->scan_request->n_channels > MAX_SCAN_CHANNEL)))
return -EINVAL;
lockdep_assert_held(&priv->mutex);
if (vif)
ctx = iwl_rxon_ctx_from_vif(vif);
if (!priv->scan_cmd) {
priv->scan_cmd = kmalloc(scan_cmd_size, GFP_KERNEL);
if (!priv->scan_cmd) {
IWL_DEBUG_SCAN(priv,
"fail to allocate memory for scan\n");
return -ENOMEM;
}
}
scan = priv->scan_cmd;
memset(scan, 0, scan_cmd_size);
scan->quiet_plcp_th = IWL_PLCP_QUIET_THRESH;
scan->quiet_time = IWL_ACTIVE_QUIET_TIME;
if (iwl_is_any_associated(priv)) {
u16 interval = 0;
u32 extra;
u32 suspend_time = 100;
u32 scan_suspend_time = 100;
IWL_DEBUG_INFO(priv, "Scanning while associated...\n");
switch (priv->scan_type) {
case IWL_SCAN_RADIO_RESET:
interval = 0;
break;
case IWL_SCAN_NORMAL:
interval = vif->bss_conf.beacon_int;
break;
}
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(priv, "suspend_time 0x%X beacon interval %d\n",
scan_suspend_time, interval);
}
switch (priv->scan_type) {
case IWL_SCAN_RADIO_RESET:
IWL_DEBUG_SCAN(priv, "Start internal passive scan.\n");
/*
* Override quiet time as firmware checks that active
* dwell is >= quiet; since we use passive scan it'll
* not actually be used.
*/
scan->quiet_time = cpu_to_le16(IWL_RADIO_RESET_DWELL_TIME);
break;
case IWL_SCAN_NORMAL:
if (priv->scan_request->n_ssids) {
int i, p = 0;
IWL_DEBUG_SCAN(priv, "Kicking off active scan\n");
/*
* The highest priority SSID is inserted to the
* probe request template.
*/
ssid_len = priv->scan_request->ssids[0].ssid_len;
ssid = priv->scan_request->ssids[0].ssid;
/*
* Invert the order of ssids, the firmware will invert
* it back.
*/
for (i = priv->scan_request->n_ssids - 1; i >= 1; i--) {
scan->direct_scan[p].id = WLAN_EID_SSID;
scan->direct_scan[p].len =
priv->scan_request->ssids[i].ssid_len;
memcpy(scan->direct_scan[p].ssid,
priv->scan_request->ssids[i].ssid,
priv->scan_request->ssids[i].ssid_len);
n_probes++;
p++;
}
is_active = true;
} else
IWL_DEBUG_SCAN(priv, "Start passive scan.\n");
break;
}
scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK;
scan->tx_cmd.sta_id = ctx->bcast_sta_id;
scan->tx_cmd.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
switch (priv->scan_band) {
case IEEE80211_BAND_2GHZ:
scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK;
chan_mod = le32_to_cpu(
priv->contexts[IWL_RXON_CTX_BSS].active.flags &
RXON_FLG_CHANNEL_MODE_MSK)
>> RXON_FLG_CHANNEL_MODE_POS;
if ((priv->scan_request && priv->scan_request->no_cck) ||
chan_mod == CHANNEL_MODE_PURE_40) {
rate = IWL_RATE_6M_PLCP;
} else {
rate = IWL_RATE_1M_PLCP;
rate_flags = RATE_MCS_CCK_MSK;
}
/*
* Internal scans are passive, so we can indiscriminately set
* the BT ignore flag on 2.4 GHz since it applies to TX only.
*/
if (priv->lib->bt_params &&
priv->lib->bt_params->advanced_bt_coexist)
scan->tx_cmd.tx_flags |= TX_CMD_FLG_IGNORE_BT;
break;
case IEEE80211_BAND_5GHZ:
rate = IWL_RATE_6M_PLCP;
break;
default:
IWL_WARN(priv, "Invalid scan band\n");
return -EIO;
}
/*
* If active scanning is requested but a certain channel is
* marked passive, we can do active scanning if we detect
* transmissions.
*
* There is an issue with some firmware versions that triggers
* a sysassert on a "good CRC threshold" of zero (== disabled),
* on a radar channel even though this means that we should NOT
* send probes.
*
* The "good CRC threshold" is the number of frames that we
* need to receive during our dwell time on a channel before
* sending out probes -- setting this to a huge value will
* mean we never reach it, but at the same time work around
* the aforementioned issue. Thus use IWL_GOOD_CRC_TH_NEVER
* here instead of IWL_GOOD_CRC_TH_DISABLED.
*
* This was fixed in later versions along with some other
* scan changes, and the threshold behaves as a flag in those
* versions.
*/
if (priv->new_scan_threshold_behaviour)
scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH_DEFAULT :
IWL_GOOD_CRC_TH_DISABLED;
else
scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH_DEFAULT :
IWL_GOOD_CRC_TH_NEVER;
band = priv->scan_band;
if (band == IEEE80211_BAND_2GHZ &&
priv->lib->bt_params &&
priv->lib->bt_params->advanced_bt_coexist) {
/* transmit 2.4 GHz probes only on first antenna */
scan_tx_antennas = first_antenna(scan_tx_antennas);
}
priv->scan_tx_ant[band] = iwl_toggle_tx_ant(priv,
priv->scan_tx_ant[band],
scan_tx_antennas);
rate_flags |= iwl_ant_idx_to_flags(priv->scan_tx_ant[band]);
scan->tx_cmd.rate_n_flags = iwl_hw_set_rate_n_flags(rate, rate_flags);
/*
* In power save mode while associated use one chain,
* otherwise use all chains
*/
if (test_bit(STATUS_POWER_PMI, &priv->status) &&
!(priv->hw->conf.flags & IEEE80211_CONF_IDLE)) {
/* rx_ant has been set to all valid chains previously */
active_chains = rx_ant &
((u8)(priv->chain_noise_data.active_chains));
if (!active_chains)
active_chains = rx_ant;
IWL_DEBUG_SCAN(priv, "chain_noise_data.active_chains: %u\n",
priv->chain_noise_data.active_chains);
rx_ant = first_antenna(active_chains);
}
if (priv->lib->bt_params &&
priv->lib->bt_params->advanced_bt_coexist &&
priv->bt_full_concurrent) {
/* operated as 1x1 in full concurrency mode */
rx_ant = first_antenna(rx_ant);
}
/* MIMO is not used here, but value is required */
rx_chain |=
priv->nvm_data->valid_rx_ant << RXON_RX_CHAIN_VALID_POS;
rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_MIMO_SEL_POS;
rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_SEL_POS;
rx_chain |= 0x1 << RXON_RX_CHAIN_DRIVER_FORCE_POS;
scan->rx_chain = cpu_to_le16(rx_chain);
switch (priv->scan_type) {
case IWL_SCAN_NORMAL:
cmd_len = iwl_fill_probe_req(
(struct ieee80211_mgmt *)scan->data,
vif->addr,
priv->scan_request->ie,
priv->scan_request->ie_len,
ssid, ssid_len,
scan_cmd_size - sizeof(*scan));
break;
case IWL_SCAN_RADIO_RESET:
/* use bcast addr, will not be transmitted but must be valid */
cmd_len = iwl_fill_probe_req(
(struct ieee80211_mgmt *)scan->data,
iwl_bcast_addr, NULL, 0,
NULL, 0,
scan_cmd_size - sizeof(*scan));
break;
default:
BUG();
}
scan->tx_cmd.len = cpu_to_le16(cmd_len);
scan->filter_flags |= (RXON_FILTER_ACCEPT_GRP_MSK |
RXON_FILTER_BCON_AWARE_MSK);
switch (priv->scan_type) {
case IWL_SCAN_RADIO_RESET:
scan->channel_count =
iwl_get_channel_for_reset_scan(priv, vif, band,
(void *)&scan->data[cmd_len]);
break;
case IWL_SCAN_NORMAL:
scan->channel_count =
iwl_get_channels_for_scan(priv, vif, band,
is_active, n_probes,
(void *)&scan->data[cmd_len]);
break;
}
if (scan->channel_count == 0) {
IWL_DEBUG_SCAN(priv, "channel count %d\n", scan->channel_count);
return -EIO;
}
cmd.len[0] += le16_to_cpu(scan->tx_cmd.len) +
scan->channel_count * sizeof(struct iwl_scan_channel);
cmd.data[0] = scan;
cmd.dataflags[0] = IWL_HCMD_DFL_NOCOPY;
scan->len = cpu_to_le16(cmd.len[0]);
/* set scan bit here for PAN params */
set_bit(STATUS_SCAN_HW, &priv->status);
ret = iwlagn_set_pan_params(priv);
if (ret) {
clear_bit(STATUS_SCAN_HW, &priv->status);
return ret;
}
ret = iwl_dvm_send_cmd(priv, &cmd);
if (ret) {
clear_bit(STATUS_SCAN_HW, &priv->status);
iwlagn_set_pan_params(priv);
}
return ret;
}
void iwl_init_scan_params(struct iwl_priv *priv)
{
u8 ant_idx = fls(priv->nvm_data->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;
}
int __must_check iwl_scan_initiate(struct iwl_priv *priv,
struct ieee80211_vif *vif,
enum iwl_scan_type scan_type,
enum ieee80211_band band)
{
int ret;
lockdep_assert_held(&priv->mutex);
cancel_delayed_work(&priv->scan_check);
if (!iwl_is_ready_rf(priv)) {
IWL_WARN(priv, "Request scan called when driver not ready.\n");
return -EIO;
}
if (test_bit(STATUS_SCAN_HW, &priv->status)) {
IWL_DEBUG_SCAN(priv,
"Multiple concurrent scan requests in parallel.\n");
return -EBUSY;
}
if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
IWL_DEBUG_SCAN(priv, "Scan request while abort pending.\n");
return -EBUSY;
}
IWL_DEBUG_SCAN(priv, "Starting %sscan...\n",
scan_type == IWL_SCAN_NORMAL ? "" :
"internal short ");
set_bit(STATUS_SCANNING, &priv->status);
priv->scan_type = scan_type;
priv->scan_start = jiffies;
priv->scan_band = band;
ret = iwlagn_request_scan(priv, vif);
if (ret) {
clear_bit(STATUS_SCANNING, &priv->status);
priv->scan_type = IWL_SCAN_NORMAL;
return ret;
}
queue_delayed_work(priv->workqueue, &priv->scan_check,
IWL_SCAN_CHECK_WATCHDOG);
return 0;
}
/*
* 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);
IWL_DEBUG_SCAN(priv, "Start internal scan\n");
mutex_lock(&priv->mutex);
if (priv->scan_type == IWL_SCAN_RADIO_RESET) {
IWL_DEBUG_SCAN(priv, "Internal scan already in progress\n");
goto unlock;
}
if (test_bit(STATUS_SCANNING, &priv->status)) {
IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
goto unlock;
}
if (iwl_scan_initiate(priv, NULL, IWL_SCAN_RADIO_RESET, priv->band))
IWL_DEBUG_SCAN(priv, "failed to start internal short scan\n");
unlock:
mutex_unlock(&priv->mutex);
}
static void iwl_bg_scan_check(struct work_struct *data)
{
struct iwl_priv *priv =
container_of(data, struct iwl_priv, scan_check.work);
IWL_DEBUG_SCAN(priv, "Scan check work\n");
/* Since we are here firmware does not finish scan and
* most likely is in bad shape, so we don't bother to
* send abort command, just force scan complete to mac80211 */
mutex_lock(&priv->mutex);
iwl_force_scan_end(priv);
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);
IWL_DEBUG_SCAN(priv, "Abort scan work\n");
/* We keep scan_check work queued in case when firmware will not
* report back scan completed notification */
mutex_lock(&priv->mutex);
iwl_scan_cancel_timeout(priv, 200);
mutex_unlock(&priv->mutex);
}
static void iwl_bg_scan_completed(struct work_struct *work)
{
struct iwl_priv *priv =
container_of(work, struct iwl_priv, scan_completed);
mutex_lock(&priv->mutex);
iwl_process_scan_complete(priv);
mutex_unlock(&priv->mutex);
}
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);
}
void iwl_cancel_scan_deferred_work(struct iwl_priv *priv)
{
cancel_work_sync(&priv->start_internal_scan);
cancel_work_sync(&priv->abort_scan);
cancel_work_sync(&priv->scan_completed);
if (cancel_delayed_work_sync(&priv->scan_check)) {
mutex_lock(&priv->mutex);
iwl_force_scan_end(priv);
mutex_unlock(&priv->mutex);
}
}