| /****************************************************************************** |
| * |
| * GPL LICENSE SUMMARY |
| * |
| * Copyright(c) 2008 - 2013 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); |
| } |
| |
| if (priv->scan_type == IWL_SCAN_ROC) |
| iwl_scan_roc_expired(priv); |
| |
| 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_ROC) |
| iwl_scan_roc_expired(priv); |
| |
| 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); |
| |
| if (priv->scan_type == IWL_SCAN_ROC && |
| !priv->hw_roc_start_notified) { |
| ieee80211_ready_on_channel(priv->hw); |
| priv->hw_roc_start_notified = true; |
| } |
| |
| 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_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; |
| } |
| |
| /** |
| * 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 (priv->scan_type != IWL_SCAN_ROC && |
| 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_ROC: |
| WARN_ON(1); |
| break; |
| 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); |
| } else if (priv->scan_type == IWL_SCAN_ROC) { |
| scan->suspend_time = 0; |
| scan->max_out_time = 0; |
| scan->quiet_time = 0; |
| scan->quiet_plcp_th = 0; |
| } |
| |
| 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; |
| case IWL_SCAN_ROC: |
| IWL_DEBUG_SCAN(priv, "Start ROC 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: |
| case IWL_SCAN_ROC: |
| /* 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; |
| case IWL_SCAN_ROC: { |
| struct iwl_scan_channel *scan_ch; |
| int n_chan, i; |
| u16 dwell; |
| |
| dwell = iwl_limit_dwell(priv, priv->hw_roc_duration); |
| n_chan = DIV_ROUND_UP(priv->hw_roc_duration, dwell); |
| |
| scan->channel_count = n_chan; |
| |
| scan_ch = (void *)&scan->data[cmd_len]; |
| |
| for (i = 0; i < n_chan; i++) { |
| scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE; |
| scan_ch->channel = |
| cpu_to_le16(priv->hw_roc_channel->hw_value); |
| |
| if (i == n_chan - 1) |
| dwell = priv->hw_roc_duration - i * dwell; |
| |
| scan_ch->active_dwell = |
| scan_ch->passive_dwell = cpu_to_le16(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 (priv->hw_roc_channel->band == IEEE80211_BAND_5GHZ) |
| scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3; |
| else |
| scan_ch->tx_gain = ((1 << 5) | (5 << 3)); |
| |
| scan_ch++; |
| } |
| } |
| |
| 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 ? "" : |
| scan_type == IWL_SCAN_ROC ? "remain-on-channel " : |
| "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); |
| } |
| } |
| |
| void iwl_scan_roc_expired(struct iwl_priv *priv) |
| { |
| /* |
| * The status bit should be set here, to prevent a race |
| * where the atomic_read returns 1, but before the execution continues |
| * iwl_scan_offchannel_skb_status() checks if the status bit is set |
| */ |
| set_bit(STATUS_SCAN_ROC_EXPIRED, &priv->status); |
| |
| if (atomic_read(&priv->num_aux_in_flight) == 0) { |
| ieee80211_remain_on_channel_expired(priv->hw); |
| priv->hw_roc_channel = NULL; |
| schedule_delayed_work(&priv->hw_roc_disable_work, |
| 10 * HZ); |
| |
| clear_bit(STATUS_SCAN_ROC_EXPIRED, &priv->status); |
| } else { |
| IWL_DEBUG_SCAN(priv, "ROC done with %d frames in aux\n", |
| atomic_read(&priv->num_aux_in_flight)); |
| } |
| } |
| |
| void iwl_scan_offchannel_skb(struct iwl_priv *priv) |
| { |
| WARN_ON(!priv->hw_roc_start_notified); |
| atomic_inc(&priv->num_aux_in_flight); |
| } |
| |
| void iwl_scan_offchannel_skb_status(struct iwl_priv *priv) |
| { |
| if (atomic_dec_return(&priv->num_aux_in_flight) == 0 && |
| test_bit(STATUS_SCAN_ROC_EXPIRED, &priv->status)) { |
| IWL_DEBUG_SCAN(priv, "0 aux frames. Calling ROC expired\n"); |
| iwl_scan_roc_expired(priv); |
| } |
| } |