| /****************************************************************************** |
| * |
| * 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/lib80211.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); |
| |
| 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(priv, "SCAN_ABORT returned %d.\n", res->u.status); |
| clear_bit(STATUS_SCAN_ABORTING, &priv->status); |
| clear_bit(STATUS_SCAN_HW, &priv->status); |
| } |
| |
| priv->alloc_rxb_skb--; |
| dev_kfree_skb_any(cmd.meta.u.skb); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL(iwl_send_scan_abort); |
| |
| /* 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(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 = (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(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 = (struct iwl_rx_packet *)rxb->skb->data; |
| 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 = (struct iwl_rx_packet *)rxb->skb->data; |
| 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); |
| |
| /* The scan completion notification came in, so kill that timer... */ |
| cancel_delayed_work(&priv->scan_check); |
| |
| 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) |
| { |
| 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; |
| u16 channel; |
| |
| sband = iwl_get_hw_mode(priv, band); |
| if (!sband) |
| return 0; |
| |
| channels = sband->channels; |
| |
| 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 < sband->n_channels; i++) { |
| if (channels[i].flags & IEEE80211_CHAN_DISABLED) |
| continue; |
| |
| channel = |
| ieee80211_frequency_to_channel(channels[i].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) || |
| (channels[i].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; |
| } |
| |
| 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"); |
| if (priv->cfg->sku & IWL_SKU_G) |
| priv->scan_bands |= BIT(IEEE80211_BAND_2GHZ); |
| if (priv->cfg->sku & IWL_SKU_A) |
| priv->scan_bands |= BIT(IEEE80211_BAND_5GHZ); |
| 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_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; |
| |
| 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_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), |
| .meta.flags = CMD_SIZE_HUGE, |
| }; |
| struct iwl_scan_cmd *scan; |
| struct ieee80211_conf *conf = NULL; |
| int ret = 0; |
| u32 rate_flags = 0; |
| u16 cmd_len; |
| enum ieee80211_band band; |
| u8 n_probes = 0; |
| u8 rx_chain = priv->hw_params.valid_rx_ant; |
| u8 rate; |
| bool is_active = false; |
| |
| conf = ieee80211_get_hw_conf(priv->hw); |
| |
| mutex_lock(&priv->mutex); |
| |
| 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; |
| if (priv->active_rxon.flags & RXON_FLG_CHANNEL_MODE_PURE_40_MSK) { |
| 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_chain = 0x6; |
| } 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); |
| |
| /* MIMO is not used here, but value is required */ |
| 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, |
| (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 (!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); |
| } |
| 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"); |
| |
| 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); |
| |