/****************************************************************************** * * GPL LICENSE SUMMARY * * Copyright(c) 2008 - 2012 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 "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; /* * If we're associated, we clamp the dwell time 98% * of the smallest beacon interval (minus 2 * channel * tune time) */ for_each_context(priv, ctx) { u16 value; 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; } value = ctx->beacon_int; if (!value) value = IWL_PASSIVE_DWELL_BASE; value = (value * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2; dwell_time = min(value, dwell_time); } 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); 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 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->eeprom_data->valid_rx_ant; u8 rate; bool is_active = false; int chan_mod; u8 active_chains; u8 scan_tx_antennas = priv->eeprom_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_ONCE(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->cfg->bt_params && priv->cfg->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->cfg->bt_params && priv->cfg->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->cfg->bt_params && priv->cfg->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->eeprom_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->eeprom_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); } }