diff options
Diffstat (limited to 'drivers/net/wireless/intel/iwlwifi/dvm/scan.c')
| -rw-r--r-- | drivers/net/wireless/intel/iwlwifi/dvm/scan.c | 1075 |
1 files changed, 1075 insertions, 0 deletions
diff --git a/drivers/net/wireless/intel/iwlwifi/dvm/scan.c b/drivers/net/wireless/intel/iwlwifi/dvm/scan.c new file mode 100644 index 000000000..81a2ddbe9 --- /dev/null +++ b/drivers/net/wireless/intel/iwlwifi/dvm/scan.c @@ -0,0 +1,1075 @@ +/****************************************************************************** + * + * GPL LICENSE SUMMARY + * + * Copyright(c) 2008 - 2014 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 <linuxwifi@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_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); + } + + 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_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 void iwl_rx_reply_scan(struct iwl_priv *priv, + struct iwl_rx_cmd_buffer *rxb) +{ +#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 +} + +/* Service SCAN_START_NOTIFICATION (0x82) */ +static void iwl_rx_scan_start_notif(struct iwl_priv *priv, + struct iwl_rx_cmd_buffer *rxb) +{ + 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); +} + +/* Service SCAN_RESULTS_NOTIFICATION (0x83) */ +static void iwl_rx_scan_results_notif(struct iwl_priv *priv, + struct iwl_rx_cmd_buffer *rxb) +{ +#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 +} + +/* Service SCAN_COMPLETE_NOTIFICATION (0x84) */ +static void iwl_rx_scan_complete_notif(struct iwl_priv *priv, + struct iwl_rx_cmd_buffer *rxb) +{ + 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); + } +} + +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_NO_IR)) + 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), }, + }; + 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 (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_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); + } + + 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; + } + + 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: + /* 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; + } + + 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 ? "" : + "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); + } +} |