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![Fabio Estevam](/assets/img/avatar_default.png)
Fix the following build warning: drivers/net/wireless/iwlwifi/iwl-scan.c: In function ‘iwlagn_request_scan’: drivers/net/wireless/iwlwifi/iwl-scan.c:572: warning: ‘cmd_len’ may be used uninitialized in this function Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com> Acked-by: Wey-Yi Guy <wey-yi.w.guy@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
1083 lines
30 KiB
C
1083 lines
30 KiB
C
/******************************************************************************
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*
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* GPL LICENSE SUMMARY
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*
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* Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
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* USA
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*
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* The full GNU General Public License is included in this distribution
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* in the file called LICENSE.GPL.
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*
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* Contact Information:
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* Intel Linux Wireless <ilw@linux.intel.com>
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* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
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*****************************************************************************/
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/etherdevice.h>
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#include <net/mac80211.h>
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#include "iwl-eeprom.h"
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#include "iwl-dev.h"
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#include "iwl-core.h"
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#include "iwl-io.h"
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#include "iwl-agn.h"
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#include "iwl-trans.h"
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/* For active scan, listen ACTIVE_DWELL_TIME (msec) on each channel after
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* sending probe req. This should be set long enough to hear probe responses
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* from more than one AP. */
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#define IWL_ACTIVE_DWELL_TIME_24 (30) /* all times in msec */
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#define IWL_ACTIVE_DWELL_TIME_52 (20)
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#define IWL_ACTIVE_DWELL_FACTOR_24GHZ (3)
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#define IWL_ACTIVE_DWELL_FACTOR_52GHZ (2)
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/* For passive scan, listen PASSIVE_DWELL_TIME (msec) on each channel.
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* Must be set longer than active dwell time.
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* For the most reliable scan, set > AP beacon interval (typically 100msec). */
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#define IWL_PASSIVE_DWELL_TIME_24 (20) /* all times in msec */
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#define IWL_PASSIVE_DWELL_TIME_52 (10)
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#define IWL_PASSIVE_DWELL_BASE (100)
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#define IWL_CHANNEL_TUNE_TIME 5
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static int iwl_send_scan_abort(struct iwl_priv *priv)
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{
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int ret;
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struct iwl_rx_packet *pkt;
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struct iwl_host_cmd cmd = {
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.id = REPLY_SCAN_ABORT_CMD,
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.flags = CMD_SYNC | CMD_WANT_SKB,
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};
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/* Exit instantly with error when device is not ready
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* to receive scan abort command or it does not perform
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* hardware scan currently */
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if (!test_bit(STATUS_READY, &priv->shrd->status) ||
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!test_bit(STATUS_GEO_CONFIGURED, &priv->shrd->status) ||
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!test_bit(STATUS_SCAN_HW, &priv->shrd->status) ||
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test_bit(STATUS_FW_ERROR, &priv->shrd->status) ||
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test_bit(STATUS_EXIT_PENDING, &priv->shrd->status))
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return -EIO;
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ret = iwl_trans_send_cmd(trans(priv), &cmd);
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if (ret)
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return ret;
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pkt = (struct iwl_rx_packet *)cmd.reply_page;
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if (pkt->u.status != CAN_ABORT_STATUS) {
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/* The scan abort will return 1 for success or
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* 2 for "failure". A failure condition can be
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* due to simply not being in an active scan which
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* can occur if we send the scan abort before we
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* the microcode has notified us that a scan is
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* completed. */
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IWL_DEBUG_SCAN(priv, "SCAN_ABORT ret %d.\n", pkt->u.status);
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ret = -EIO;
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}
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iwl_free_pages(priv->shrd, cmd.reply_page);
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return ret;
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}
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static void iwl_complete_scan(struct iwl_priv *priv, bool aborted)
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{
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/* check if scan was requested from mac80211 */
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if (priv->scan_request) {
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IWL_DEBUG_SCAN(priv, "Complete scan in mac80211\n");
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ieee80211_scan_completed(priv->hw, aborted);
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}
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if (priv->scan_type == IWL_SCAN_ROC) {
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ieee80211_remain_on_channel_expired(priv->hw);
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priv->hw_roc_channel = NULL;
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schedule_delayed_work(&priv->hw_roc_disable_work, 10 * HZ);
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}
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priv->scan_type = IWL_SCAN_NORMAL;
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priv->scan_vif = NULL;
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priv->scan_request = NULL;
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}
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static void iwl_process_scan_complete(struct iwl_priv *priv)
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{
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bool aborted;
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lockdep_assert_held(&priv->shrd->mutex);
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if (!test_and_clear_bit(STATUS_SCAN_COMPLETE, &priv->shrd->status))
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return;
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IWL_DEBUG_SCAN(priv, "Completed scan.\n");
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cancel_delayed_work(&priv->scan_check);
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aborted = test_and_clear_bit(STATUS_SCAN_ABORTING, &priv->shrd->status);
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if (aborted)
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IWL_DEBUG_SCAN(priv, "Aborted scan completed.\n");
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if (!test_and_clear_bit(STATUS_SCANNING, &priv->shrd->status)) {
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IWL_DEBUG_SCAN(priv, "Scan already completed.\n");
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goto out_settings;
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}
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if (priv->scan_type == IWL_SCAN_ROC) {
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ieee80211_remain_on_channel_expired(priv->hw);
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priv->hw_roc_channel = NULL;
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schedule_delayed_work(&priv->hw_roc_disable_work, 10 * HZ);
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}
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if (priv->scan_type != IWL_SCAN_NORMAL && !aborted) {
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int err;
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/* Check if mac80211 requested scan during our internal scan */
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if (priv->scan_request == NULL)
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goto out_complete;
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/* If so request a new scan */
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err = iwl_scan_initiate(priv, priv->scan_vif, IWL_SCAN_NORMAL,
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priv->scan_request->channels[0]->band);
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if (err) {
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IWL_DEBUG_SCAN(priv,
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"failed to initiate pending scan: %d\n", err);
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aborted = true;
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goto out_complete;
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}
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return;
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}
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out_complete:
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iwl_complete_scan(priv, aborted);
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out_settings:
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/* Can we still talk to firmware ? */
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if (!iwl_is_ready_rf(priv->shrd))
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return;
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iwlagn_post_scan(priv);
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}
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void iwl_force_scan_end(struct iwl_priv *priv)
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{
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lockdep_assert_held(&priv->shrd->mutex);
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if (!test_bit(STATUS_SCANNING, &priv->shrd->status)) {
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IWL_DEBUG_SCAN(priv, "Forcing scan end while not scanning\n");
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return;
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}
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IWL_DEBUG_SCAN(priv, "Forcing scan end\n");
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clear_bit(STATUS_SCANNING, &priv->shrd->status);
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clear_bit(STATUS_SCAN_HW, &priv->shrd->status);
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clear_bit(STATUS_SCAN_ABORTING, &priv->shrd->status);
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clear_bit(STATUS_SCAN_COMPLETE, &priv->shrd->status);
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iwl_complete_scan(priv, true);
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}
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static void iwl_do_scan_abort(struct iwl_priv *priv)
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{
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int ret;
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lockdep_assert_held(&priv->shrd->mutex);
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if (!test_bit(STATUS_SCANNING, &priv->shrd->status)) {
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IWL_DEBUG_SCAN(priv, "Not performing scan to abort\n");
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return;
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}
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if (test_and_set_bit(STATUS_SCAN_ABORTING, &priv->shrd->status)) {
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IWL_DEBUG_SCAN(priv, "Scan abort in progress\n");
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return;
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}
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ret = iwl_send_scan_abort(priv);
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if (ret) {
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IWL_DEBUG_SCAN(priv, "Send scan abort failed %d\n", ret);
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iwl_force_scan_end(priv);
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} else
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IWL_DEBUG_SCAN(priv, "Successfully send scan abort\n");
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}
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/**
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* iwl_scan_cancel - Cancel any currently executing HW scan
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*/
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int iwl_scan_cancel(struct iwl_priv *priv)
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{
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IWL_DEBUG_SCAN(priv, "Queuing abort scan\n");
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queue_work(priv->shrd->workqueue, &priv->abort_scan);
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return 0;
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}
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/**
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* iwl_scan_cancel_timeout - Cancel any currently executing HW scan
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* @ms: amount of time to wait (in milliseconds) for scan to abort
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*
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*/
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void iwl_scan_cancel_timeout(struct iwl_priv *priv, unsigned long ms)
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{
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unsigned long timeout = jiffies + msecs_to_jiffies(ms);
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lockdep_assert_held(&priv->shrd->mutex);
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IWL_DEBUG_SCAN(priv, "Scan cancel timeout\n");
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iwl_do_scan_abort(priv);
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while (time_before_eq(jiffies, timeout)) {
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if (!test_bit(STATUS_SCAN_HW, &priv->shrd->status))
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goto finished;
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msleep(20);
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}
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return;
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finished:
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/*
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* Now STATUS_SCAN_HW is clear. This means that the
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* device finished, but the background work is going
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* to execute at best as soon as we release the mutex.
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* Since we need to be able to issue a new scan right
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* after this function returns, run the complete here.
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* The STATUS_SCAN_COMPLETE bit will then be cleared
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* and prevent the background work from "completing"
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* a possible new scan.
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*/
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iwl_process_scan_complete(priv);
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}
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/* Service response to REPLY_SCAN_CMD (0x80) */
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static int iwl_rx_reply_scan(struct iwl_priv *priv,
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struct iwl_rx_mem_buffer *rxb,
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struct iwl_device_cmd *cmd)
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{
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#ifdef CONFIG_IWLWIFI_DEBUG
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struct iwl_rx_packet *pkt = rxb_addr(rxb);
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struct iwl_scanreq_notification *notif =
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(struct iwl_scanreq_notification *)pkt->u.raw;
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IWL_DEBUG_SCAN(priv, "Scan request status = 0x%x\n", notif->status);
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#endif
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return 0;
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}
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/* Service SCAN_START_NOTIFICATION (0x82) */
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static int iwl_rx_scan_start_notif(struct iwl_priv *priv,
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struct iwl_rx_mem_buffer *rxb,
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struct iwl_device_cmd *cmd)
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{
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struct iwl_rx_packet *pkt = rxb_addr(rxb);
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struct iwl_scanstart_notification *notif =
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(struct iwl_scanstart_notification *)pkt->u.raw;
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priv->scan_start_tsf = le32_to_cpu(notif->tsf_low);
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IWL_DEBUG_SCAN(priv, "Scan start: "
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"%d [802.11%s] "
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"(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n",
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notif->channel,
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notif->band ? "bg" : "a",
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le32_to_cpu(notif->tsf_high),
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le32_to_cpu(notif->tsf_low),
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notif->status, notif->beacon_timer);
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if (priv->scan_type == IWL_SCAN_ROC &&
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!priv->hw_roc_start_notified) {
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ieee80211_ready_on_channel(priv->hw);
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priv->hw_roc_start_notified = true;
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}
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return 0;
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}
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/* Service SCAN_RESULTS_NOTIFICATION (0x83) */
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static int iwl_rx_scan_results_notif(struct iwl_priv *priv,
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struct iwl_rx_mem_buffer *rxb,
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struct iwl_device_cmd *cmd)
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{
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#ifdef CONFIG_IWLWIFI_DEBUG
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struct iwl_rx_packet *pkt = rxb_addr(rxb);
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struct iwl_scanresults_notification *notif =
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(struct iwl_scanresults_notification *)pkt->u.raw;
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IWL_DEBUG_SCAN(priv, "Scan ch.res: "
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"%d [802.11%s] "
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"probe status: %u:%u "
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"(TSF: 0x%08X:%08X) - %d "
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"elapsed=%lu usec\n",
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notif->channel,
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notif->band ? "bg" : "a",
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notif->probe_status, notif->num_probe_not_sent,
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le32_to_cpu(notif->tsf_high),
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le32_to_cpu(notif->tsf_low),
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le32_to_cpu(notif->statistics[0]),
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le32_to_cpu(notif->tsf_low) - priv->scan_start_tsf);
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#endif
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return 0;
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}
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/* Service SCAN_COMPLETE_NOTIFICATION (0x84) */
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static int iwl_rx_scan_complete_notif(struct iwl_priv *priv,
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struct iwl_rx_mem_buffer *rxb,
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struct iwl_device_cmd *cmd)
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{
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struct iwl_rx_packet *pkt = rxb_addr(rxb);
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struct iwl_scancomplete_notification *scan_notif = (void *)pkt->u.raw;
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IWL_DEBUG_SCAN(priv, "Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n",
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scan_notif->scanned_channels,
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scan_notif->tsf_low,
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scan_notif->tsf_high, scan_notif->status);
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IWL_DEBUG_SCAN(priv, "Scan on %sGHz took %dms\n",
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(priv->scan_band == IEEE80211_BAND_2GHZ) ? "2.4" : "5.2",
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jiffies_to_msecs(jiffies - priv->scan_start));
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/*
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* When aborting, we run the scan completed background work inline
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* and the background work must then do nothing. The SCAN_COMPLETE
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* bit helps implement that logic and thus needs to be set before
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* queueing the work. Also, since the scan abort waits for SCAN_HW
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* to clear, we need to set SCAN_COMPLETE before clearing SCAN_HW
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* to avoid a race there.
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*/
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set_bit(STATUS_SCAN_COMPLETE, &priv->shrd->status);
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clear_bit(STATUS_SCAN_HW, &priv->shrd->status);
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queue_work(priv->shrd->workqueue, &priv->scan_completed);
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if (priv->iw_mode != NL80211_IFTYPE_ADHOC &&
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iwl_advanced_bt_coexist(priv) &&
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priv->bt_status != scan_notif->bt_status) {
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if (scan_notif->bt_status) {
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/* BT on */
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if (!priv->bt_ch_announce)
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priv->bt_traffic_load =
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IWL_BT_COEX_TRAFFIC_LOAD_HIGH;
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/*
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* otherwise, no traffic load information provided
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* no changes made
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*/
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} else {
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/* BT off */
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priv->bt_traffic_load =
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IWL_BT_COEX_TRAFFIC_LOAD_NONE;
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}
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priv->bt_status = scan_notif->bt_status;
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queue_work(priv->shrd->workqueue,
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&priv->bt_traffic_change_work);
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}
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return 0;
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}
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void iwl_setup_rx_scan_handlers(struct iwl_priv *priv)
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{
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/* scan handlers */
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priv->rx_handlers[REPLY_SCAN_CMD] = iwl_rx_reply_scan;
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priv->rx_handlers[SCAN_START_NOTIFICATION] = iwl_rx_scan_start_notif;
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priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] =
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iwl_rx_scan_results_notif;
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priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] =
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iwl_rx_scan_complete_notif;
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}
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static u16 iwl_get_active_dwell_time(struct iwl_priv *priv,
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enum ieee80211_band band, u8 n_probes)
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{
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if (band == IEEE80211_BAND_5GHZ)
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return IWL_ACTIVE_DWELL_TIME_52 +
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IWL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1);
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else
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return IWL_ACTIVE_DWELL_TIME_24 +
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IWL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1);
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}
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|
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static u16 iwl_limit_dwell(struct iwl_priv *priv, u16 dwell_time)
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{
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struct iwl_rxon_context *ctx;
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|
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/*
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* If we're associated, we clamp the dwell time 98%
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* of the smallest beacon interval (minus 2 * channel
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* tune time)
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*/
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for_each_context(priv, ctx) {
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u16 value;
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|
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if (!iwl_is_associated_ctx(ctx))
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continue;
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if (ctx->staging.dev_type == RXON_DEV_TYPE_P2P)
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continue;
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value = ctx->beacon_int;
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if (!value)
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value = IWL_PASSIVE_DWELL_BASE;
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value = (value * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
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dwell_time = min(value, dwell_time);
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}
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return dwell_time;
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}
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|
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static u16 iwl_get_passive_dwell_time(struct iwl_priv *priv,
|
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enum ieee80211_band band)
|
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{
|
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u16 passive = (band == IEEE80211_BAND_2GHZ) ?
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IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 :
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IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52;
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|
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return iwl_limit_dwell(priv, passive);
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}
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|
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static int iwl_get_single_channel_for_scan(struct iwl_priv *priv,
|
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struct ieee80211_vif *vif,
|
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enum ieee80211_band band,
|
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struct iwl_scan_channel *scan_ch)
|
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{
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const struct ieee80211_supported_band *sband;
|
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u16 passive_dwell = 0;
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u16 active_dwell = 0;
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int added = 0;
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u16 channel = 0;
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|
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sband = iwl_get_hw_mode(priv, band);
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if (!sband) {
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IWL_ERR(priv, "invalid band\n");
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return added;
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}
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|
|
|
active_dwell = iwl_get_active_dwell_time(priv, band, 0);
|
|
passive_dwell = iwl_get_passive_dwell_time(priv, band);
|
|
|
|
if (passive_dwell <= active_dwell)
|
|
passive_dwell = active_dwell + 1;
|
|
|
|
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(active_dwell);
|
|
scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
|
|
/* 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));
|
|
added++;
|
|
} else
|
|
IWL_ERR(priv, "no valid channel found\n");
|
|
return added;
|
|
}
|
|
|
|
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;
|
|
const struct iwl_channel_info *ch_info;
|
|
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);
|
|
|
|
ch_info = iwl_get_channel_info(priv, band, channel);
|
|
if (!is_channel_valid(ch_info)) {
|
|
IWL_DEBUG_SCAN(priv,
|
|
"Channel %d is INVALID for this band.\n",
|
|
channel);
|
|
continue;
|
|
}
|
|
|
|
if (!is_active || is_channel_passive(ch_info) ||
|
|
(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;
|
|
}
|
|
|
|
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 = hw_params(priv).valid_rx_ant;
|
|
u8 rate;
|
|
bool is_active = false;
|
|
int chan_mod;
|
|
u8 active_chains;
|
|
u8 scan_tx_antennas = hw_params(priv).valid_tx_ant;
|
|
int ret;
|
|
|
|
lockdep_assert_held(&priv->shrd->mutex);
|
|
|
|
if (vif)
|
|
ctx = iwl_rxon_ctx_from_vif(vif);
|
|
|
|
if (!priv->scan_cmd) {
|
|
priv->scan_cmd = kmalloc(sizeof(struct iwl_scan_cmd) +
|
|
IWL_MAX_SCAN_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, sizeof(struct iwl_scan_cmd) + IWL_MAX_SCAN_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");
|
|
break;
|
|
case IWL_SCAN_NORMAL:
|
|
if (priv->scan_request->n_ssids) {
|
|
int i, p = 0;
|
|
IWL_DEBUG_SCAN(priv, "Kicking off active scan\n");
|
|
for (i = 0; i < priv->scan_request->n_ssids; i++) {
|
|
/* always does wildcard anyway */
|
|
if (!priv->scan_request->ssids[i].ssid_len)
|
|
continue;
|
|
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 (cfg(priv)->bt_params &&
|
|
cfg(priv)->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 (cfg(priv)->scan_rx_antennas[band])
|
|
rx_ant = cfg(priv)->scan_rx_antennas[band];
|
|
|
|
if (band == IEEE80211_BAND_2GHZ &&
|
|
cfg(priv)->bt_params &&
|
|
cfg(priv)->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 use one chain, otherwise use all chains */
|
|
if (test_bit(STATUS_POWER_PMI, &priv->shrd->status)) {
|
|
/* 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 (cfg(priv)->bt_params &&
|
|
cfg(priv)->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 |=
|
|
hw_params(priv).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(priv,
|
|
(struct ieee80211_mgmt *)scan->data,
|
|
vif->addr,
|
|
priv->scan_request->ie,
|
|
priv->scan_request->ie_len,
|
|
IWL_MAX_SCAN_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(priv,
|
|
(struct ieee80211_mgmt *)scan->data,
|
|
iwl_bcast_addr, NULL, 0,
|
|
IWL_MAX_SCAN_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_single_channel_for_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->shrd->status);
|
|
|
|
ret = iwlagn_set_pan_params(priv);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = iwl_trans_send_cmd(trans(priv), &cmd);
|
|
if (ret) {
|
|
clear_bit(STATUS_SCAN_HW, &priv->shrd->status);
|
|
iwlagn_set_pan_params(priv);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
void iwl_init_scan_params(struct iwl_priv *priv)
|
|
{
|
|
u8 ant_idx = fls(hw_params(priv).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->shrd->mutex);
|
|
|
|
cancel_delayed_work(&priv->scan_check);
|
|
|
|
if (!iwl_is_ready_rf(priv->shrd)) {
|
|
IWL_WARN(priv, "Request scan called when driver not ready.\n");
|
|
return -EIO;
|
|
}
|
|
|
|
if (test_bit(STATUS_SCAN_HW, &priv->shrd->status)) {
|
|
IWL_DEBUG_SCAN(priv,
|
|
"Multiple concurrent scan requests in parallel.\n");
|
|
return -EBUSY;
|
|
}
|
|
|
|
if (test_bit(STATUS_SCAN_ABORTING, &priv->shrd->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->shrd->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->shrd->status);
|
|
priv->scan_type = IWL_SCAN_NORMAL;
|
|
return ret;
|
|
}
|
|
|
|
queue_delayed_work(priv->shrd->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->shrd->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->shrd->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->shrd->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->shrd->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->shrd->mutex);
|
|
iwl_force_scan_end(priv);
|
|
mutex_unlock(&priv->shrd->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;
|
|
}
|
|
|
|
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->shrd->mutex);
|
|
iwl_scan_cancel_timeout(priv, 200);
|
|
mutex_unlock(&priv->shrd->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->shrd->mutex);
|
|
iwl_process_scan_complete(priv);
|
|
mutex_unlock(&priv->shrd->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->shrd->mutex);
|
|
iwl_force_scan_end(priv);
|
|
mutex_unlock(&priv->shrd->mutex);
|
|
}
|
|
}
|