+++ /dev/null
-/******************************************************************************
- *
- * 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 <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_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);
- }
-}
projects / cascardo / linux.git / blobdiff