548 строки
15 KiB
C
548 строки
15 KiB
C
/******************************************************************************
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*
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* GPL LICENSE SUMMARY
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*
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* Copyright(c) 2008 - 2010 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-sta.h"
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#include "iwl-io.h"
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#include "iwl-helpers.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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/**
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* iwl_scan_cancel - Cancel any currently executing HW scan
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*
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* NOTE: priv->mutex is not required before calling this function
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*/
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int iwl_scan_cancel(struct iwl_priv *priv)
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{
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if (!test_bit(STATUS_SCAN_HW, &priv->status)) {
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clear_bit(STATUS_SCANNING, &priv->status);
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return 0;
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}
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if (test_bit(STATUS_SCANNING, &priv->status)) {
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if (!test_and_set_bit(STATUS_SCAN_ABORTING, &priv->status)) {
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IWL_DEBUG_SCAN(priv, "Queuing scan abort.\n");
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queue_work(priv->workqueue, &priv->abort_scan);
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} else
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IWL_DEBUG_SCAN(priv, "Scan abort already in progress.\n");
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return test_bit(STATUS_SCANNING, &priv->status);
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}
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return 0;
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}
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EXPORT_SYMBOL(iwl_scan_cancel);
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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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* NOTE: priv->mutex must be held before calling this function
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*/
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int iwl_scan_cancel_timeout(struct iwl_priv *priv, unsigned long ms)
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{
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unsigned long now = jiffies;
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int ret;
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ret = iwl_scan_cancel(priv);
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if (ret && ms) {
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mutex_unlock(&priv->mutex);
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while (!time_after(jiffies, now + msecs_to_jiffies(ms)) &&
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test_bit(STATUS_SCANNING, &priv->status))
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msleep(1);
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mutex_lock(&priv->mutex);
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return test_bit(STATUS_SCANNING, &priv->status);
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}
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return ret;
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}
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EXPORT_SYMBOL(iwl_scan_cancel_timeout);
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static int iwl_send_scan_abort(struct iwl_priv *priv)
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{
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int ret = 0;
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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_WANT_SKB,
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};
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/* If there isn't a scan actively going on in the hardware
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* then we are in between scan bands and not actually
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* actively scanning, so don't send the abort command */
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if (!test_bit(STATUS_SCAN_HW, &priv->status)) {
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clear_bit(STATUS_SCAN_ABORTING, &priv->status);
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return 0;
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}
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ret = iwl_send_cmd_sync(priv, &cmd);
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if (ret) {
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clear_bit(STATUS_SCAN_ABORTING, &priv->status);
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return ret;
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}
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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_INFO(priv, "SCAN_ABORT returned %d.\n", pkt->u.status);
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clear_bit(STATUS_SCAN_ABORTING, &priv->status);
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clear_bit(STATUS_SCAN_HW, &priv->status);
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}
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iwl_free_pages(priv, cmd.reply_page);
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return ret;
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}
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/* Service response to REPLY_SCAN_CMD (0x80) */
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static void iwl_rx_reply_scan(struct iwl_priv *priv,
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struct iwl_rx_mem_buffer *rxb)
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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_RX(priv, "Scan request status = 0x%x\n", notif->status);
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#endif
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}
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/* Service SCAN_START_NOTIFICATION (0x82) */
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static void iwl_rx_scan_start_notif(struct iwl_priv *priv,
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struct iwl_rx_mem_buffer *rxb)
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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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}
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/* Service SCAN_RESULTS_NOTIFICATION (0x83) */
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static void iwl_rx_scan_results_notif(struct iwl_priv *priv,
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struct iwl_rx_mem_buffer *rxb)
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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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"(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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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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}
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/* Service SCAN_COMPLETE_NOTIFICATION (0x84) */
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static void iwl_rx_scan_complete_notif(struct iwl_priv *priv,
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struct iwl_rx_mem_buffer *rxb)
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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_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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#endif
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/* The HW is no longer scanning */
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clear_bit(STATUS_SCAN_HW, &priv->status);
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IWL_DEBUG_INFO(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(elapsed_jiffies
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(priv->scan_start, jiffies)));
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/*
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* If a request to abort was given, or the scan did not succeed
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* then we reset the scan state machine and terminate,
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* re-queuing another scan if one has been requested
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*/
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if (test_and_clear_bit(STATUS_SCAN_ABORTING, &priv->status))
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IWL_DEBUG_INFO(priv, "Aborted scan completed.\n");
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IWL_DEBUG_INFO(priv, "Setting scan to off\n");
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clear_bit(STATUS_SCANNING, &priv->status);
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queue_work(priv->workqueue, &priv->scan_completed);
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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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EXPORT_SYMBOL(iwl_setup_rx_scan_handlers);
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inline u16 iwl_get_active_dwell_time(struct iwl_priv *priv,
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enum ieee80211_band band,
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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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EXPORT_SYMBOL(iwl_get_active_dwell_time);
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u16 iwl_get_passive_dwell_time(struct iwl_priv *priv,
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enum ieee80211_band band,
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struct ieee80211_vif *vif)
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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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if (iwl_is_associated(priv)) {
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/* If we're associated, we clamp the maximum passive
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* dwell time to be 98% of the beacon interval (minus
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* 2 * channel tune time) */
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passive = vif ? vif->bss_conf.beacon_int : 0;
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if ((passive > IWL_PASSIVE_DWELL_BASE) || !passive)
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passive = IWL_PASSIVE_DWELL_BASE;
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passive = (passive * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
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}
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return passive;
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}
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EXPORT_SYMBOL(iwl_get_passive_dwell_time);
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void iwl_init_scan_params(struct iwl_priv *priv)
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{
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u8 ant_idx = fls(priv->hw_params.valid_tx_ant) - 1;
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if (!priv->scan_tx_ant[IEEE80211_BAND_5GHZ])
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priv->scan_tx_ant[IEEE80211_BAND_5GHZ] = ant_idx;
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if (!priv->scan_tx_ant[IEEE80211_BAND_2GHZ])
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priv->scan_tx_ant[IEEE80211_BAND_2GHZ] = ant_idx;
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}
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EXPORT_SYMBOL(iwl_init_scan_params);
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static int iwl_scan_initiate(struct iwl_priv *priv, struct ieee80211_vif *vif)
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{
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WARN_ON(!mutex_is_locked(&priv->mutex));
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IWL_DEBUG_INFO(priv, "Starting scan...\n");
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set_bit(STATUS_SCANNING, &priv->status);
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priv->is_internal_short_scan = false;
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priv->scan_start = jiffies;
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if (WARN_ON(!priv->cfg->ops->utils->request_scan))
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return -EOPNOTSUPP;
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priv->cfg->ops->utils->request_scan(priv, vif);
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return 0;
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}
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int iwl_mac_hw_scan(struct ieee80211_hw *hw,
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struct ieee80211_vif *vif,
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struct cfg80211_scan_request *req)
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{
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struct iwl_priv *priv = hw->priv;
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int ret;
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IWL_DEBUG_MAC80211(priv, "enter\n");
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if (req->n_channels == 0)
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return -EINVAL;
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mutex_lock(&priv->mutex);
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if (!iwl_is_ready_rf(priv)) {
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ret = -EIO;
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IWL_DEBUG_MAC80211(priv, "leave - not ready or exit pending\n");
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goto out_unlock;
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}
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if (test_bit(STATUS_SCANNING, &priv->status)) {
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IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
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ret = -EAGAIN;
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goto out_unlock;
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}
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if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
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IWL_DEBUG_SCAN(priv, "Scan request while abort pending\n");
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ret = -EAGAIN;
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goto out_unlock;
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}
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/* mac80211 will only ask for one band at a time */
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priv->scan_band = req->channels[0]->band;
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priv->scan_request = req;
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ret = iwl_scan_initiate(priv, vif);
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IWL_DEBUG_MAC80211(priv, "leave\n");
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out_unlock:
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mutex_unlock(&priv->mutex);
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return ret;
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}
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EXPORT_SYMBOL(iwl_mac_hw_scan);
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/*
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* internal short scan, this function should only been called while associated.
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* It will reset and tune the radio to prevent possible RF related problem
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*/
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void iwl_internal_short_hw_scan(struct iwl_priv *priv)
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{
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queue_work(priv->workqueue, &priv->start_internal_scan);
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}
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void iwl_bg_start_internal_scan(struct work_struct *work)
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{
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struct iwl_priv *priv =
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container_of(work, struct iwl_priv, start_internal_scan);
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mutex_lock(&priv->mutex);
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if (priv->is_internal_short_scan == true) {
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IWL_DEBUG_SCAN(priv, "Internal scan already in progress\n");
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goto unlock;
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}
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if (!iwl_is_ready_rf(priv)) {
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IWL_DEBUG_SCAN(priv, "not ready or exit pending\n");
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goto unlock;
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}
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if (test_bit(STATUS_SCANNING, &priv->status)) {
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IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
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goto unlock;
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}
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if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
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IWL_DEBUG_SCAN(priv, "Scan request while abort pending\n");
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goto unlock;
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}
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priv->scan_band = priv->band;
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IWL_DEBUG_SCAN(priv, "Start internal short scan...\n");
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set_bit(STATUS_SCANNING, &priv->status);
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priv->is_internal_short_scan = true;
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if (WARN_ON(!priv->cfg->ops->utils->request_scan))
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goto unlock;
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priv->cfg->ops->utils->request_scan(priv, NULL);
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unlock:
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mutex_unlock(&priv->mutex);
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}
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EXPORT_SYMBOL(iwl_bg_start_internal_scan);
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void iwl_bg_scan_check(struct work_struct *data)
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{
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struct iwl_priv *priv =
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container_of(data, struct iwl_priv, scan_check.work);
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if (test_bit(STATUS_EXIT_PENDING, &priv->status))
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return;
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mutex_lock(&priv->mutex);
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if (test_bit(STATUS_SCANNING, &priv->status) ||
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test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
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IWL_DEBUG_SCAN(priv, "Scan completion watchdog resetting "
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"adapter (%dms)\n",
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jiffies_to_msecs(IWL_SCAN_CHECK_WATCHDOG));
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if (!test_bit(STATUS_EXIT_PENDING, &priv->status))
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iwl_send_scan_abort(priv);
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}
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mutex_unlock(&priv->mutex);
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}
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EXPORT_SYMBOL(iwl_bg_scan_check);
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/**
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* iwl_fill_probe_req - fill in all required fields and IE for probe request
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*/
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u16 iwl_fill_probe_req(struct iwl_priv *priv, struct ieee80211_mgmt *frame,
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const u8 *ies, int ie_len, int left)
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{
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int len = 0;
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u8 *pos = NULL;
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/* Make sure there is enough space for the probe request,
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* two mandatory IEs and the data */
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left -= 24;
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if (left < 0)
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return 0;
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frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
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memcpy(frame->da, iwl_bcast_addr, ETH_ALEN);
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memcpy(frame->sa, priv->mac_addr, ETH_ALEN);
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memcpy(frame->bssid, iwl_bcast_addr, ETH_ALEN);
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frame->seq_ctrl = 0;
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len += 24;
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/* ...next IE... */
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pos = &frame->u.probe_req.variable[0];
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/* fill in our indirect SSID IE */
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left -= 2;
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if (left < 0)
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return 0;
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*pos++ = WLAN_EID_SSID;
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*pos++ = 0;
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len += 2;
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if (WARN_ON(left < ie_len))
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return len;
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if (ies && ie_len) {
|
|
memcpy(pos, ies, ie_len);
|
|
len += ie_len;
|
|
}
|
|
|
|
return (u16)len;
|
|
}
|
|
EXPORT_SYMBOL(iwl_fill_probe_req);
|
|
|
|
void iwl_bg_abort_scan(struct work_struct *work)
|
|
{
|
|
struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan);
|
|
|
|
if (!test_bit(STATUS_READY, &priv->status) ||
|
|
!test_bit(STATUS_GEO_CONFIGURED, &priv->status))
|
|
return;
|
|
|
|
mutex_lock(&priv->mutex);
|
|
|
|
cancel_delayed_work_sync(&priv->scan_check);
|
|
set_bit(STATUS_SCAN_ABORTING, &priv->status);
|
|
iwl_send_scan_abort(priv);
|
|
|
|
mutex_unlock(&priv->mutex);
|
|
}
|
|
EXPORT_SYMBOL(iwl_bg_abort_scan);
|
|
|
|
void iwl_bg_scan_completed(struct work_struct *work)
|
|
{
|
|
struct iwl_priv *priv =
|
|
container_of(work, struct iwl_priv, scan_completed);
|
|
bool internal = false;
|
|
|
|
IWL_DEBUG_SCAN(priv, "SCAN complete scan\n");
|
|
|
|
cancel_delayed_work(&priv->scan_check);
|
|
|
|
mutex_lock(&priv->mutex);
|
|
if (priv->is_internal_short_scan) {
|
|
priv->is_internal_short_scan = false;
|
|
IWL_DEBUG_SCAN(priv, "internal short scan completed\n");
|
|
internal = true;
|
|
}
|
|
mutex_unlock(&priv->mutex);
|
|
|
|
/*
|
|
* Do not hold mutex here since this will cause mac80211 to call
|
|
* into driver again into functions that will attempt to take
|
|
* mutex.
|
|
*/
|
|
if (!internal)
|
|
ieee80211_scan_completed(priv->hw, false);
|
|
|
|
if (test_bit(STATUS_EXIT_PENDING, &priv->status))
|
|
return;
|
|
|
|
/* Since setting the TXPOWER may have been deferred while
|
|
* performing the scan, fire one off */
|
|
mutex_lock(&priv->mutex);
|
|
iwl_set_tx_power(priv, priv->tx_power_user_lmt, true);
|
|
mutex_unlock(&priv->mutex);
|
|
}
|
|
EXPORT_SYMBOL(iwl_bg_scan_completed);
|
|
|
|
void iwl_setup_scan_deferred_work(struct iwl_priv *priv)
|
|
{
|
|
INIT_WORK(&priv->scan_completed, iwl_bg_scan_completed);
|
|
INIT_WORK(&priv->abort_scan, iwl_bg_abort_scan);
|
|
INIT_WORK(&priv->start_internal_scan, iwl_bg_start_internal_scan);
|
|
INIT_DELAYED_WORK(&priv->scan_check, iwl_bg_scan_check);
|
|
}
|
|
EXPORT_SYMBOL(iwl_setup_scan_deferred_work);
|
|
|