/****************************************************************************** * * GPL LICENSE SUMMARY * * Copyright(c) 2008 - 2010 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 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 *****************************************************************************/ #include #include #include #include #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_and_set_bit(STATUS_SCAN_ABORTING, &priv->status)) { IWL_DEBUG_SCAN(priv, "Queuing scan abort.\n"); 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\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); #endif } /* Service SCAN_COMPLETE_NOTIFICATION (0x84) */ static void iwl_rx_scan_complete_notif(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb) { struct iwl_rx_packet *pkt = 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); /* The HW is no longer scanning */ clear_bit(STATUS_SCAN_HW, &priv->status); IWL_DEBUG_INFO(priv, "Scan on %sGHz took %dms\n", (priv->scan_band == IEEE80211_BAND_2GHZ) ? "2.4" : "5.2", jiffies_to_msecs(elapsed_jiffies (priv->scan_start, jiffies))); /* * 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_and_clear_bit(STATUS_SCAN_ABORTING, &priv->status)) IWL_DEBUG_INFO(priv, "Aborted scan completed.\n"); IWL_DEBUG_INFO(priv, "Setting scan to off\n"); clear_bit(STATUS_SCANNING, &priv->status); if (priv->iw_mode != NL80211_IFTYPE_ADHOC && priv->cfg->advanced_bt_coexist && 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); } queue_work(priv->workqueue, &priv->scan_completed); } 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, struct ieee80211_vif *vif) { struct iwl_rxon_context *ctx; 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_any_associated(priv)) { /* * If we're associated, we clamp the maximum passive * dwell time to be 98% of the smallest beacon interval * (minus 2 * channel tune time) */ for_each_context(priv, ctx) { u16 value; if (!iwl_is_associated_ctx(ctx)) continue; value = ctx->vif ? ctx->vif->bss_conf.beacon_int : 0; if ((value > IWL_PASSIVE_DWELL_BASE) || !value) value = IWL_PASSIVE_DWELL_BASE; value = (value * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2; passive = min(value, passive); } } return passive; } EXPORT_SYMBOL(iwl_get_passive_dwell_time); 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, struct ieee80211_vif *vif) { lockdep_assert_held(&priv->mutex); IWL_DEBUG_INFO(priv, "Starting scan...\n"); set_bit(STATUS_SCANNING, &priv->status); priv->is_internal_short_scan = false; priv->scan_start = jiffies; if (WARN_ON(!priv->cfg->ops->utils->request_scan)) return -EOPNOTSUPP; priv->cfg->ops->utils->request_scan(priv, vif); return 0; } int iwl_mac_hw_scan(struct ieee80211_hw *hw, struct ieee80211_vif *vif, struct cfg80211_scan_request *req) { struct iwl_priv *priv = hw->priv; int ret; IWL_DEBUG_MAC80211(priv, "enter\n"); if (req->n_channels == 0) return -EINVAL; mutex_lock(&priv->mutex); if (!iwl_is_ready_rf(priv)) { ret = -EIO; IWL_DEBUG_MAC80211(priv, "leave - not ready or exit pending\n"); goto out_unlock; } if (test_bit(STATUS_SCANNING, &priv->status) && !priv->is_internal_short_scan) { IWL_DEBUG_SCAN(priv, "Scan already in progress.\n"); ret = -EAGAIN; goto out_unlock; } if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) { IWL_DEBUG_SCAN(priv, "Scan request while abort pending\n"); ret = -EAGAIN; goto out_unlock; } /* mac80211 will only ask for one band at a time */ priv->scan_band = req->channels[0]->band; priv->scan_request = req; priv->scan_vif = vif; /* * If an internal scan is in progress, just set * up the scan_request as per above. */ if (priv->is_internal_short_scan) ret = 0; else ret = iwl_scan_initiate(priv, vif); IWL_DEBUG_MAC80211(priv, "leave\n"); out_unlock: mutex_unlock(&priv->mutex); return ret; } EXPORT_SYMBOL(iwl_mac_hw_scan); /* * 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); mutex_lock(&priv->mutex); if (priv->is_internal_short_scan == true) { IWL_DEBUG_SCAN(priv, "Internal scan already in progress\n"); goto unlock; } if (!iwl_is_ready_rf(priv)) { IWL_DEBUG_SCAN(priv, "not ready or exit pending\n"); goto unlock; } if (test_bit(STATUS_SCANNING, &priv->status)) { IWL_DEBUG_SCAN(priv, "Scan already in progress.\n"); goto unlock; } if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) { IWL_DEBUG_SCAN(priv, "Scan request while abort pending\n"); goto unlock; } priv->scan_band = priv->band; IWL_DEBUG_SCAN(priv, "Start internal short scan...\n"); set_bit(STATUS_SCANNING, &priv->status); priv->is_internal_short_scan = true; if (WARN_ON(!priv->cfg->ops->utils->request_scan)) goto unlock; priv->cfg->ops->utils->request_scan(priv, NULL); 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); 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 (%dms)\n", jiffies_to_msecs(IWL_SCAN_CHECK_WATCHDOG)); if (!test_bit(STATUS_EXIT_PENDING, &priv->status)) iwl_send_scan_abort(priv); } mutex_unlock(&priv->mutex); } /** * iwl_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 *ta, 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, ta, 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; if (ies && ie_len) { memcpy(pos, ies, ie_len); len += ie_len; } return (u16)len; } EXPORT_SYMBOL(iwl_fill_probe_req); static 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; cancel_delayed_work(&priv->scan_check); mutex_lock(&priv->mutex); if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) iwl_send_scan_abort(priv); 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); bool internal = false; bool scan_completed = false; struct iwl_rxon_context *ctx; IWL_DEBUG_SCAN(priv, "SCAN complete scan\n"); cancel_delayed_work(&priv->scan_check); mutex_lock(&priv->mutex); if (priv->is_internal_short_scan) { priv->is_internal_short_scan = false; IWL_DEBUG_SCAN(priv, "internal short scan completed\n"); internal = true; } else if (priv->scan_request) { scan_completed = true; priv->scan_request = NULL; priv->scan_vif = NULL; } if (test_bit(STATUS_EXIT_PENDING, &priv->status)) goto out; if (internal && priv->scan_request) iwl_scan_initiate(priv, priv->scan_vif); /* Since setting the TXPOWER may have been deferred while * performing the scan, fire one off */ iwl_set_tx_power(priv, priv->tx_power_user_lmt, true); /* * Since setting the RXON may have been deferred while * performing the scan, fire one off if needed */ for_each_context(priv, ctx) iwlcore_commit_rxon(priv, ctx); out: if (priv->cfg->ops->hcmd->set_pan_params) priv->cfg->ops->hcmd->set_pan_params(priv); mutex_unlock(&priv->mutex); /* * Do not hold mutex here since this will cause mac80211 to call * into driver again into functions that will attempt to take * mutex. */ if (scan_completed) ieee80211_scan_completed(priv->hw, false); } 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); } EXPORT_SYMBOL(iwl_setup_scan_deferred_work);