diff options
Diffstat (limited to 'drivers/net/wireless/iwlwifi/iwl-scan.c')
| -rw-r--r-- | drivers/net/wireless/iwlwifi/iwl-scan.c | 855 |
1 files changed, 0 insertions, 855 deletions
diff --git a/drivers/net/wireless/iwlwifi/iwl-scan.c b/drivers/net/wireless/iwlwifi/iwl-scan.c deleted file mode 100644 index fa1c89ba645..00000000000 --- a/drivers/net/wireless/iwlwifi/iwl-scan.c +++ /dev/null @@ -1,855 +0,0 @@ -/****************************************************************************** - * - * GPL LICENSE SUMMARY - * - * Copyright(c) 2008 - 2009 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/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_bit(STATUS_SCAN_ABORTING, &priv->status)) { - IWL_DEBUG_SCAN(priv, "Queuing scan abort.\n"); - set_bit(STATUS_SCAN_ABORTING, &priv->status); - 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 (%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) -{ -#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 pass on %sGHz took %dms\n", - (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ)) ? - "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, band G precedes A in order of scanning - * as seen in iwl_bg_request_scan */ - if (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ)) - priv->scan_bands &= ~BIT(IEEE80211_BAND_2GHZ); - else if (priv->scan_bands & BIT(IEEE80211_BAND_5GHZ)) - priv->scan_bands &= ~BIT(IEEE80211_BAND_5GHZ); - - /* 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(priv, "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) - goto reschedule; - } - - priv->last_scan_jiffies = jiffies; - priv->next_scan_jiffies = 0; - IWL_DEBUG_INFO(priv, "Setting scan to off\n"); - - clear_bit(STATUS_SCANNING, &priv->status); - - IWL_DEBUG_INFO(priv, "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); - -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); - -static int iwl_get_channels_for_scan(struct iwl_priv *priv, - 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; - const struct iwl_channel_info *ch_info; - 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 = ieee80211_frequency_to_channel(chan->center_freq); - scan_ch->channel = cpu_to_le16(channel); - - ch_info = iwl_get_channel_info(priv, band, channel); - if (!is_channel_valid(ch_info)) { - IWL_DEBUG_SCAN(priv, "Channel %d is INVALID for this band.\n", - channel); - continue; - } - - if (!is_active || is_channel_passive(ch_info) || - (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN)) - 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; -} - -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) -{ - if (!iwl_is_ready_rf(priv)) { - IWL_DEBUG_SCAN(priv, "Aborting scan due to not ready.\n"); - return -EIO; - } - - if (test_bit(STATUS_SCANNING, &priv->status)) { - IWL_DEBUG_SCAN(priv, "Scan already in progress.\n"); - return -EAGAIN; - } - - if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) { - IWL_DEBUG_SCAN(priv, "Scan request while abort pending\n"); - return -EAGAIN; - } - - IWL_DEBUG_INFO(priv, "Starting scan...\n"); - 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; -} - -#define IWL_DELAY_NEXT_SCAN (HZ*2) - -int iwl_mac_hw_scan(struct ieee80211_hw *hw, - struct cfg80211_scan_request *req) -{ - unsigned long flags; - struct iwl_priv *priv = hw->priv; - int ret, i; - - IWL_DEBUG_MAC80211(priv, "enter\n"); - - mutex_lock(&priv->mutex); - spin_lock_irqsave(&priv->lock, flags); - - if (!iwl_is_ready_rf(priv)) { - ret = -EIO; - IWL_DEBUG_MAC80211(priv, "leave - not ready or exit pending\n"); - goto out_unlock; - } - - /* We don't schedule scan within next_scan_jiffies period. - * Avoid scanning during possible EAPOL exchange, return - * success immediately. - */ - if (priv->next_scan_jiffies && - time_after(priv->next_scan_jiffies, jiffies)) { - IWL_DEBUG_SCAN(priv, "scan rejected: within next scan period\n"); - queue_work(priv->workqueue, &priv->scan_completed); - ret = 0; - goto out_unlock; - } - - /* if we just finished scan ask for delay */ - if (iwl_is_associated(priv) && priv->last_scan_jiffies && - time_after(priv->last_scan_jiffies + IWL_DELAY_NEXT_SCAN, jiffies)) { - IWL_DEBUG_SCAN(priv, "scan rejected: within previous scan period\n"); - queue_work(priv->workqueue, &priv->scan_completed); - ret = 0; - goto out_unlock; - } - - priv->scan_bands = 0; - for (i = 0; i < req->n_channels; i++) - priv->scan_bands |= BIT(req->channels[i]->band); - - priv->scan_request = req; - - ret = iwl_scan_initiate(priv); - - IWL_DEBUG_MAC80211(priv, "leave\n"); - -out_unlock: - spin_unlock_irqrestore(&priv->lock, flags); - mutex_unlock(&priv->mutex); - - return ret; -} -EXPORT_SYMBOL(iwl_mac_hw_scan); - -#define IWL_SCAN_CHECK_WATCHDOG (7 * HZ) - -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; - - memcpy(pos, ies, ie_len); - len += ie_len; - left -= ie_len; - - return (u16)len; -} -EXPORT_SYMBOL(iwl_fill_probe_req); - -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), - .flags = CMD_SIZE_HUGE, - }; - struct iwl_scan_cmd *scan; - struct ieee80211_conf *conf = NULL; - int ret = 0; - u32 rate_flags = 0; - u16 cmd_len; - u16 rx_chain = 0; - enum ieee80211_band band; - u8 n_probes = 0; - u8 rx_ant = priv->hw_params.valid_rx_ant; - u8 rate; - bool is_active = false; - int chan_mod; - u8 active_chains; - - conf = ieee80211_get_hw_conf(priv->hw); - - mutex_lock(&priv->mutex); - - cancel_delayed_work(&priv->scan_check); - - if (!iwl_is_ready(priv)) { - IWL_WARN(priv, "request scan called when driver not ready.\n"); - goto done; - } - - /* Make sure the scan wasn't canceled 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(priv, "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(priv, "Aborting scan due to device shutdown\n"); - goto done; - } - - if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) { - IWL_DEBUG_HC(priv, "Scan request while abort pending. Queuing.\n"); - goto done; - } - - if (iwl_is_rfkill(priv)) { - IWL_DEBUG_HC(priv, "Aborting scan due to RF Kill activation\n"); - goto done; - } - - if (!test_bit(STATUS_READY, &priv->status)) { - IWL_DEBUG_HC(priv, "Scan request while uninitialized. Queuing.\n"); - goto done; - } - - if (!priv->scan_bands) { - IWL_DEBUG_HC(priv, "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(priv, "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(priv, "suspend_time 0x%X beacon interval %d\n", - scan_suspend_time, interval); - } - - if (priv->scan_request->n_ssids) { - int i, p = 0; - IWL_DEBUG_SCAN(priv, "Kicking off active scan\n"); - for (i = 0; i < priv->scan_request->n_ssids; i++) { - /* always does wildcard anyway */ - if (!priv->scan_request->ssids[i].ssid_len) - continue; - 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"); - - 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; - - - if (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ)) { - band = IEEE80211_BAND_2GHZ; - scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK; - chan_mod = le32_to_cpu(priv->active_rxon.flags & RXON_FLG_CHANNEL_MODE_MSK) - >> RXON_FLG_CHANNEL_MODE_POS; - if (chan_mod == CHANNEL_MODE_PURE_40) { - rate = IWL_RATE_6M_PLCP; - } else { - rate = IWL_RATE_1M_PLCP; - rate_flags = RATE_MCS_CCK_MSK; - } - scan->good_CRC_th = 0; - } else if (priv->scan_bands & BIT(IEEE80211_BAND_5GHZ)) { - band = IEEE80211_BAND_5GHZ; - rate = IWL_RATE_6M_PLCP; - /* - * If active scaning is requested but a certain channel - * is marked passive, we can do active scanning if we - * detect transmissions. - */ - scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH : 0; - - /* 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. - */ - if ((priv->hw_rev & CSR_HW_REV_TYPE_MSK) == CSR_HW_REV_TYPE_4965) - rx_ant = ANT_BC; - } else { - IWL_WARN(priv, "Invalid scan band count\n"); - goto done; - } - - priv->scan_tx_ant[band] = - iwl_toggle_tx_ant(priv, priv->scan_tx_ant[band]); - 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 use one chain, otherwise use all chains */ - if (test_bit(STATUS_POWER_PMI, &priv->status)) { - /* 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); - } - /* MIMO is not used here, but value is required */ - rx_chain |= priv->hw_params.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); - cmd_len = iwl_fill_probe_req(priv, - (struct ieee80211_mgmt *)scan->data, - priv->scan_request->ie, - priv->scan_request->ie_len, - IWL_MAX_SCAN_SIZE - sizeof(*scan)); - - scan->tx_cmd.len = cpu_to_le16(cmd_len); - - if (iwl_is_monitor_mode(priv)) - scan->filter_flags = RXON_FILTER_PROMISC_MSK; - - scan->filter_flags |= (RXON_FILTER_ACCEPT_GRP_MSK | - RXON_FILTER_BCON_AWARE_MSK); - - scan->channel_count = - iwl_get_channels_for_scan(priv, band, is_active, n_probes, - (void *)&scan->data[le16_to_cpu(scan->tx_cmd.len)]); - - if (scan->channel_count == 0) { - IWL_DEBUG_SCAN(priv, "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: - /* Cannot perform scan. Make sure we clear scanning - * bits from status so next scan request can be performed. - * If we don't clear scanning status bit here all next scan - * will fail - */ - clear_bit(STATUS_SCAN_HW, &priv->status); - clear_bit(STATUS_SCANNING, &priv->status); - /* inform mac80211 scan aborted */ - queue_work(priv->workqueue, &priv->scan_completed); - mutex_unlock(&priv->mutex); -} - -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); - - ieee80211_scan_completed(priv->hw, false); - - 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->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); - |