924 lines
26 KiB
C
924 lines
26 KiB
C
/******************************************************************************
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*
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* GPL LICENSE SUMMARY
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*
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* Copyright(c) 2008 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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* Tomas Winkler <tomas.winkler@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 <net/mac80211.h>
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#include <linux/etherdevice.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 (20) /* all times in msec */
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#define IWL_ACTIVE_DWELL_TIME_52 (10)
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/* For faster active scanning, scan will move to the next channel if fewer than
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* PLCP_QUIET_THRESH packets are heard on this channel within
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* ACTIVE_QUIET_TIME after sending probe request. This shortens the dwell
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* time if it's a quiet channel (nothing responded to our probe, and there's
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* no other traffic).
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* Disable "quiet" feature by setting PLCP_QUIET_THRESH to 0. */
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#define IWL_PLCP_QUIET_THRESH __constant_cpu_to_le16(1) /* packets */
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#define IWL_ACTIVE_QUIET_TIME __constant_cpu_to_le16(5) /* msec */
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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 scan_tx_ant[3] = {
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RATE_MCS_ANT_A_MSK, RATE_MCS_ANT_B_MSK, RATE_MCS_ANT_C_MSK
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};
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static int iwl_is_empty_essid(const char *essid, int essid_len)
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{
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/* Single white space is for Linksys APs */
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if (essid_len == 1 && essid[0] == ' ')
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return 1;
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/* Otherwise, if the entire essid is 0, we assume it is hidden */
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while (essid_len) {
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essid_len--;
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if (essid[essid_len] != '\0')
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return 0;
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}
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return 1;
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}
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const char *iwl_escape_essid(const char *essid, u8 essid_len)
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{
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static char escaped[IW_ESSID_MAX_SIZE * 2 + 1];
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const char *s = essid;
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char *d = escaped;
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if (iwl_is_empty_essid(essid, essid_len)) {
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memcpy(escaped, "<hidden>", sizeof("<hidden>"));
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return escaped;
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}
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essid_len = min(essid_len, (u8) IW_ESSID_MAX_SIZE);
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while (essid_len--) {
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if (*s == '\0') {
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*d++ = '\\';
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*d++ = '0';
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s++;
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} else
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*d++ = *s++;
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}
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*d = '\0';
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return escaped;
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}
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EXPORT_SYMBOL(iwl_escape_essid);
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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_bit(STATUS_SCAN_ABORTING, &priv->status)) {
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IWL_DEBUG_SCAN("Queuing scan abort.\n");
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set_bit(STATUS_SCAN_ABORTING, &priv->status);
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queue_work(priv->workqueue, &priv->abort_scan);
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} else
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IWL_DEBUG_SCAN("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 *res;
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struct iwl_host_cmd cmd = {
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.id = REPLY_SCAN_ABORT_CMD,
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.meta.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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res = (struct iwl_rx_packet *)cmd.meta.u.skb->data;
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if (res->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("SCAN_ABORT returned %d.\n", res->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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dev_kfree_skb_any(cmd.meta.u.skb);
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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 = (struct iwl_rx_packet *)rxb->skb->data;
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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("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 = (struct iwl_rx_packet *)rxb->skb->data;
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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("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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notif->tsf_high,
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notif->tsf_low, 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 = (struct iwl_rx_packet *)rxb->skb->data;
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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("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 (%dms since last)\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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jiffies_to_msecs(elapsed_jiffies
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(priv->last_scan_jiffies, jiffies)));
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#endif
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priv->last_scan_jiffies = jiffies;
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priv->next_scan_jiffies = 0;
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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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struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
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struct iwl_scancomplete_notification *scan_notif = (void *)pkt->u.raw;
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IWL_DEBUG_SCAN("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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/* The HW is no longer scanning */
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clear_bit(STATUS_SCAN_HW, &priv->status);
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/* The scan completion notification came in, so kill that timer... */
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cancel_delayed_work(&priv->scan_check);
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IWL_DEBUG_INFO("Scan pass on %sGHz took %dms\n",
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(priv->scan_bands & BIT(IEEE80211_BAND_2GHZ)) ?
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"2.4" : "5.2",
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jiffies_to_msecs(elapsed_jiffies
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(priv->scan_pass_start, jiffies)));
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/* Remove this scanned band from the list of pending
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* bands to scan, band G precedes A in order of scanning
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* as seen in iwl_bg_request_scan */
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if (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ))
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priv->scan_bands &= ~BIT(IEEE80211_BAND_2GHZ);
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else if (priv->scan_bands & BIT(IEEE80211_BAND_5GHZ))
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priv->scan_bands &= ~BIT(IEEE80211_BAND_5GHZ);
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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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if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
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IWL_DEBUG_INFO("Aborted scan completed.\n");
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clear_bit(STATUS_SCAN_ABORTING, &priv->status);
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} else {
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/* If there are more bands on this scan pass reschedule */
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if (priv->scan_bands)
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goto reschedule;
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}
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priv->last_scan_jiffies = jiffies;
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priv->next_scan_jiffies = 0;
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IWL_DEBUG_INFO("Setting scan to off\n");
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clear_bit(STATUS_SCANNING, &priv->status);
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IWL_DEBUG_INFO("Scan took %dms\n",
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jiffies_to_msecs(elapsed_jiffies(priv->scan_start, jiffies)));
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queue_work(priv->workqueue, &priv->scan_completed);
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return;
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reschedule:
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priv->scan_pass_start = jiffies;
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queue_work(priv->workqueue, &priv->request_scan);
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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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static inline u16 iwl_get_active_dwell_time(struct iwl_priv *priv,
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enum ieee80211_band band)
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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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else
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return IWL_ACTIVE_DWELL_TIME_24;
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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 active = iwl_get_active_dwell_time(priv, band);
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u16 passive = (band != IEEE80211_BAND_5GHZ) ?
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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 = priv->beacon_int;
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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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if (passive <= active)
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passive = active + 1;
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return passive;
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}
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static int iwl_get_channels_for_scan(struct iwl_priv *priv,
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enum ieee80211_band band,
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u8 is_active, u8 direct_mask,
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struct iwl_scan_channel *scan_ch)
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{
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const struct ieee80211_channel *channels = NULL;
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const struct ieee80211_supported_band *sband;
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const struct iwl_channel_info *ch_info;
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u16 passive_dwell = 0;
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u16 active_dwell = 0;
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int added, i;
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sband = iwl_get_hw_mode(priv, band);
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if (!sband)
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return 0;
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channels = sband->channels;
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active_dwell = iwl_get_active_dwell_time(priv, band);
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passive_dwell = iwl_get_passive_dwell_time(priv, band);
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for (i = 0, added = 0; i < sband->n_channels; i++) {
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if (channels[i].flags & IEEE80211_CHAN_DISABLED)
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continue;
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scan_ch->channel =
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ieee80211_frequency_to_channel(channels[i].center_freq);
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ch_info = iwl_get_channel_info(priv, band, scan_ch->channel);
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if (!is_channel_valid(ch_info)) {
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IWL_DEBUG_SCAN("Channel %d is INVALID for this band.\n",
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scan_ch->channel);
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continue;
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}
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if (!is_active || is_channel_passive(ch_info) ||
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(channels[i].flags & IEEE80211_CHAN_PASSIVE_SCAN))
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scan_ch->type = 0;
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else
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scan_ch->type = 1;
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if (scan_ch->type & 1)
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scan_ch->type |= (direct_mask << 1);
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scan_ch->active_dwell = cpu_to_le16(active_dwell);
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scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
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/* Set txpower levels to defaults */
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scan_ch->dsp_atten = 110;
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if (band == IEEE80211_BAND_5GHZ)
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scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
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else {
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scan_ch->tx_gain = ((1 << 5) | (5 << 3));
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/* NOTE: if we were doing 6Mb OFDM for scans we'd use
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* power level:
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* scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3;
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*/
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}
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IWL_DEBUG_SCAN("Scanning %d [%s %d]\n",
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scan_ch->channel,
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(scan_ch->type & 1) ? "ACTIVE" : "PASSIVE",
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(scan_ch->type & 1) ?
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active_dwell : passive_dwell);
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scan_ch++;
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added++;
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}
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IWL_DEBUG_SCAN("total channels to scan %d \n", added);
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return added;
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}
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void iwl_init_scan_params(struct iwl_priv *priv)
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{
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if (!priv->scan_tx_ant[IEEE80211_BAND_5GHZ])
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priv->scan_tx_ant[IEEE80211_BAND_5GHZ] = RATE_MCS_ANT_INIT_IND;
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if (!priv->scan_tx_ant[IEEE80211_BAND_2GHZ])
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priv->scan_tx_ant[IEEE80211_BAND_2GHZ] = RATE_MCS_ANT_INIT_IND;
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}
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int iwl_scan_initiate(struct iwl_priv *priv)
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{
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if (priv->iw_mode == IEEE80211_IF_TYPE_AP) {
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IWL_ERROR("APs don't scan.\n");
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return 0;
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}
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if (!iwl_is_ready_rf(priv)) {
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IWL_DEBUG_SCAN("Aborting scan due to not ready.\n");
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return -EIO;
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}
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if (test_bit(STATUS_SCANNING, &priv->status)) {
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IWL_DEBUG_SCAN("Scan already in progress.\n");
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return -EAGAIN;
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}
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|
|
|
if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
|
|
IWL_DEBUG_SCAN("Scan request while abort pending. "
|
|
"Queuing.\n");
|
|
return -EAGAIN;
|
|
}
|
|
|
|
IWL_DEBUG_INFO("Starting scan...\n");
|
|
if (priv->cfg->sku & IWL_SKU_G)
|
|
priv->scan_bands |= BIT(IEEE80211_BAND_2GHZ);
|
|
if (priv->cfg->sku & IWL_SKU_A)
|
|
priv->scan_bands |= BIT(IEEE80211_BAND_5GHZ);
|
|
set_bit(STATUS_SCANNING, &priv->status);
|
|
priv->scan_start = jiffies;
|
|
priv->scan_pass_start = priv->scan_start;
|
|
|
|
queue_work(priv->workqueue, &priv->request_scan);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(iwl_scan_initiate);
|
|
|
|
#define IWL_SCAN_CHECK_WATCHDOG (7 * HZ)
|
|
|
|
static void iwl_bg_scan_check(struct work_struct *data)
|
|
{
|
|
struct iwl_priv *priv =
|
|
container_of(data, struct iwl_priv, scan_check.work);
|
|
|
|
if (test_bit(STATUS_EXIT_PENDING, &priv->status))
|
|
return;
|
|
|
|
mutex_lock(&priv->mutex);
|
|
if (test_bit(STATUS_SCANNING, &priv->status) ||
|
|
test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
|
|
IWL_DEBUG(IWL_DL_SCAN, "Scan completion watchdog resetting "
|
|
"adapter (%dms)\n",
|
|
jiffies_to_msecs(IWL_SCAN_CHECK_WATCHDOG));
|
|
|
|
if (!test_bit(STATUS_EXIT_PENDING, &priv->status))
|
|
iwl_send_scan_abort(priv);
|
|
}
|
|
mutex_unlock(&priv->mutex);
|
|
}
|
|
/**
|
|
* iwl_supported_rate_to_ie - fill in the supported rate in IE field
|
|
*
|
|
* return : set the bit for each supported rate insert in ie
|
|
*/
|
|
static u16 iwl_supported_rate_to_ie(u8 *ie, u16 supported_rate,
|
|
u16 basic_rate, int *left)
|
|
{
|
|
u16 ret_rates = 0, bit;
|
|
int i;
|
|
u8 *cnt = ie;
|
|
u8 *rates = ie + 1;
|
|
|
|
for (bit = 1, i = 0; i < IWL_RATE_COUNT; i++, bit <<= 1) {
|
|
if (bit & supported_rate) {
|
|
ret_rates |= bit;
|
|
rates[*cnt] = iwl_rates[i].ieee |
|
|
((bit & basic_rate) ? 0x80 : 0x00);
|
|
(*cnt)++;
|
|
(*left)--;
|
|
if ((*left <= 0) ||
|
|
(*cnt >= IWL_SUPPORTED_RATES_IE_LEN))
|
|
break;
|
|
}
|
|
}
|
|
|
|
return ret_rates;
|
|
}
|
|
|
|
|
|
static void iwl_ht_cap_to_ie(const struct ieee80211_supported_band *sband,
|
|
u8 *pos, int *left)
|
|
{
|
|
struct ieee80211_ht_cap *ht_cap;
|
|
|
|
if (!sband || !sband->ht_info.ht_supported)
|
|
return;
|
|
|
|
if (*left < sizeof(struct ieee80211_ht_cap))
|
|
return;
|
|
|
|
*pos++ = sizeof(struct ieee80211_ht_cap);
|
|
ht_cap = (struct ieee80211_ht_cap *) pos;
|
|
|
|
ht_cap->cap_info = cpu_to_le16(sband->ht_info.cap);
|
|
memcpy(ht_cap->supp_mcs_set, sband->ht_info.supp_mcs_set, 16);
|
|
ht_cap->ampdu_params_info =
|
|
(sband->ht_info.ampdu_factor & IEEE80211_HT_CAP_AMPDU_FACTOR) |
|
|
((sband->ht_info.ampdu_density << 2) &
|
|
IEEE80211_HT_CAP_AMPDU_DENSITY);
|
|
*left -= sizeof(struct ieee80211_ht_cap);
|
|
}
|
|
|
|
/**
|
|
* iwl_fill_probe_req - fill in all required fields and IE for probe request
|
|
*/
|
|
|
|
static u16 iwl_fill_probe_req(struct iwl_priv *priv,
|
|
enum ieee80211_band band,
|
|
struct ieee80211_mgmt *frame,
|
|
int left)
|
|
{
|
|
int len = 0;
|
|
u8 *pos = NULL;
|
|
u16 active_rates, ret_rates, cck_rates, active_rate_basic;
|
|
const struct ieee80211_supported_band *sband =
|
|
iwl_get_hw_mode(priv, band);
|
|
|
|
|
|
/* 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, priv->mac_addr, 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;
|
|
|
|
/* fill in supported rate */
|
|
left -= 2;
|
|
if (left < 0)
|
|
return 0;
|
|
|
|
*pos++ = WLAN_EID_SUPP_RATES;
|
|
*pos = 0;
|
|
|
|
/* exclude 60M rate */
|
|
active_rates = priv->rates_mask;
|
|
active_rates &= ~IWL_RATE_60M_MASK;
|
|
|
|
active_rate_basic = active_rates & IWL_BASIC_RATES_MASK;
|
|
|
|
cck_rates = IWL_CCK_RATES_MASK & active_rates;
|
|
ret_rates = iwl_supported_rate_to_ie(pos, cck_rates,
|
|
active_rate_basic, &left);
|
|
active_rates &= ~ret_rates;
|
|
|
|
ret_rates = iwl_supported_rate_to_ie(pos, active_rates,
|
|
active_rate_basic, &left);
|
|
active_rates &= ~ret_rates;
|
|
|
|
len += 2 + *pos;
|
|
pos += (*pos) + 1;
|
|
|
|
if (active_rates == 0)
|
|
goto fill_end;
|
|
|
|
/* fill in supported extended rate */
|
|
/* ...next IE... */
|
|
left -= 2;
|
|
if (left < 0)
|
|
return 0;
|
|
/* ... fill it in... */
|
|
*pos++ = WLAN_EID_EXT_SUPP_RATES;
|
|
*pos = 0;
|
|
iwl_supported_rate_to_ie(pos, active_rates, active_rate_basic, &left);
|
|
if (*pos > 0) {
|
|
len += 2 + *pos;
|
|
pos += (*pos) + 1;
|
|
} else {
|
|
pos--;
|
|
}
|
|
|
|
fill_end:
|
|
|
|
left -= 2;
|
|
if (left < 0)
|
|
return 0;
|
|
|
|
*pos++ = WLAN_EID_HT_CAPABILITY;
|
|
*pos = 0;
|
|
iwl_ht_cap_to_ie(sband, pos, &left);
|
|
if (*pos > 0)
|
|
len += 2 + *pos;
|
|
|
|
return (u16)len;
|
|
}
|
|
|
|
static u32 iwl_scan_tx_ant(struct iwl_priv *priv, enum ieee80211_band band)
|
|
{
|
|
int i, ind;
|
|
|
|
ind = priv->scan_tx_ant[band];
|
|
for (i = 0; i < priv->hw_params.tx_chains_num; i++) {
|
|
ind = (ind+1) >= priv->hw_params.tx_chains_num ? 0 : ind+1;
|
|
if (priv->hw_params.valid_tx_ant & (1 << ind)) {
|
|
priv->scan_tx_ant[band] = ind;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return scan_tx_ant[ind];
|
|
}
|
|
|
|
|
|
static void iwl_bg_request_scan(struct work_struct *data)
|
|
{
|
|
struct iwl_priv *priv =
|
|
container_of(data, struct iwl_priv, request_scan);
|
|
struct iwl_host_cmd cmd = {
|
|
.id = REPLY_SCAN_CMD,
|
|
.len = sizeof(struct iwl_scan_cmd),
|
|
.meta.flags = CMD_SIZE_HUGE,
|
|
};
|
|
struct iwl_scan_cmd *scan;
|
|
struct ieee80211_conf *conf = NULL;
|
|
int ret = 0;
|
|
u32 tx_ant;
|
|
u16 cmd_len;
|
|
enum ieee80211_band band;
|
|
u8 direct_mask;
|
|
u8 rx_chain = 0x7; /* bitmap: ABC chains */
|
|
|
|
conf = ieee80211_get_hw_conf(priv->hw);
|
|
|
|
mutex_lock(&priv->mutex);
|
|
|
|
if (!iwl_is_ready(priv)) {
|
|
IWL_WARNING("request scan called when driver not ready.\n");
|
|
goto done;
|
|
}
|
|
|
|
/* Make sure the scan wasn't cancelled before this queued work
|
|
* was given the chance to run... */
|
|
if (!test_bit(STATUS_SCANNING, &priv->status))
|
|
goto done;
|
|
|
|
/* This should never be called or scheduled if there is currently
|
|
* a scan active in the hardware. */
|
|
if (test_bit(STATUS_SCAN_HW, &priv->status)) {
|
|
IWL_DEBUG_INFO("Multiple concurrent scan requests in parallel. "
|
|
"Ignoring second request.\n");
|
|
ret = -EIO;
|
|
goto done;
|
|
}
|
|
|
|
if (test_bit(STATUS_EXIT_PENDING, &priv->status)) {
|
|
IWL_DEBUG_SCAN("Aborting scan due to device shutdown\n");
|
|
goto done;
|
|
}
|
|
|
|
if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
|
|
IWL_DEBUG_HC("Scan request while abort pending. Queuing.\n");
|
|
goto done;
|
|
}
|
|
|
|
if (iwl_is_rfkill(priv)) {
|
|
IWL_DEBUG_HC("Aborting scan due to RF Kill activation\n");
|
|
goto done;
|
|
}
|
|
|
|
if (!test_bit(STATUS_READY, &priv->status)) {
|
|
IWL_DEBUG_HC("Scan request while uninitialized. Queuing.\n");
|
|
goto done;
|
|
}
|
|
|
|
if (!priv->scan_bands) {
|
|
IWL_DEBUG_HC("Aborting scan due to no requested bands\n");
|
|
goto done;
|
|
}
|
|
|
|
if (!priv->scan) {
|
|
priv->scan = kmalloc(sizeof(struct iwl_scan_cmd) +
|
|
IWL_MAX_SCAN_SIZE, GFP_KERNEL);
|
|
if (!priv->scan) {
|
|
ret = -ENOMEM;
|
|
goto done;
|
|
}
|
|
}
|
|
scan = priv->scan;
|
|
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 (iwl_is_associated(priv)) {
|
|
u16 interval = 0;
|
|
u32 extra;
|
|
u32 suspend_time = 100;
|
|
u32 scan_suspend_time = 100;
|
|
unsigned long flags;
|
|
|
|
IWL_DEBUG_INFO("Scanning while associated...\n");
|
|
|
|
spin_lock_irqsave(&priv->lock, flags);
|
|
interval = priv->beacon_int;
|
|
spin_unlock_irqrestore(&priv->lock, flags);
|
|
|
|
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("suspend_time 0x%X beacon interval %d\n",
|
|
scan_suspend_time, interval);
|
|
}
|
|
|
|
/* We should add the ability for user to lock to PASSIVE ONLY */
|
|
if (priv->one_direct_scan) {
|
|
IWL_DEBUG_SCAN("Start direct scan for '%s'\n",
|
|
iwl_escape_essid(priv->direct_ssid,
|
|
priv->direct_ssid_len));
|
|
scan->direct_scan[0].id = WLAN_EID_SSID;
|
|
scan->direct_scan[0].len = priv->direct_ssid_len;
|
|
memcpy(scan->direct_scan[0].ssid,
|
|
priv->direct_ssid, priv->direct_ssid_len);
|
|
direct_mask = 1;
|
|
} else if (!iwl_is_associated(priv) && priv->essid_len) {
|
|
IWL_DEBUG_SCAN("Start direct scan for '%s' (not associated)\n",
|
|
iwl_escape_essid(priv->essid, priv->essid_len));
|
|
scan->direct_scan[0].id = WLAN_EID_SSID;
|
|
scan->direct_scan[0].len = priv->essid_len;
|
|
memcpy(scan->direct_scan[0].ssid, priv->essid, priv->essid_len);
|
|
direct_mask = 1;
|
|
} else {
|
|
IWL_DEBUG_SCAN("Start indirect scan.\n");
|
|
direct_mask = 0;
|
|
}
|
|
|
|
scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK;
|
|
scan->tx_cmd.sta_id = priv->hw_params.bcast_sta_id;
|
|
scan->tx_cmd.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
|
|
|
|
|
|
if (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ)) {
|
|
band = IEEE80211_BAND_2GHZ;
|
|
scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK;
|
|
tx_ant = iwl_scan_tx_ant(priv, band);
|
|
if (priv->active_rxon.flags & RXON_FLG_CHANNEL_MODE_PURE_40_MSK)
|
|
scan->tx_cmd.rate_n_flags =
|
|
iwl_hw_set_rate_n_flags(IWL_RATE_6M_PLCP,
|
|
tx_ant);
|
|
else
|
|
scan->tx_cmd.rate_n_flags =
|
|
iwl_hw_set_rate_n_flags(IWL_RATE_1M_PLCP,
|
|
tx_ant |
|
|
RATE_MCS_CCK_MSK);
|
|
scan->good_CRC_th = 0;
|
|
} else if (priv->scan_bands & BIT(IEEE80211_BAND_5GHZ)) {
|
|
band = IEEE80211_BAND_5GHZ;
|
|
tx_ant = iwl_scan_tx_ant(priv, band);
|
|
scan->tx_cmd.rate_n_flags =
|
|
iwl_hw_set_rate_n_flags(IWL_RATE_6M_PLCP,
|
|
tx_ant);
|
|
scan->good_CRC_th = IWL_GOOD_CRC_TH;
|
|
|
|
/* Force use of chains B and C (0x6) for scan Rx for 4965
|
|
* Avoid A (0x1) because of its off-channel reception on A-band.
|
|
* MIMO is not used here, but value is required */
|
|
if ((priv->hw_rev & CSR_HW_REV_TYPE_MSK) == CSR_HW_REV_TYPE_4965)
|
|
rx_chain = 0x6;
|
|
} else {
|
|
IWL_WARNING("Invalid scan band count\n");
|
|
goto done;
|
|
}
|
|
|
|
scan->rx_chain = RXON_RX_CHAIN_DRIVER_FORCE_MSK |
|
|
cpu_to_le16((0x7 << RXON_RX_CHAIN_VALID_POS) |
|
|
(rx_chain << RXON_RX_CHAIN_FORCE_SEL_POS) |
|
|
(0x7 << RXON_RX_CHAIN_FORCE_MIMO_SEL_POS));
|
|
|
|
cmd_len = iwl_fill_probe_req(priv, band,
|
|
(struct ieee80211_mgmt *)scan->data,
|
|
IWL_MAX_SCAN_SIZE - sizeof(*scan));
|
|
|
|
scan->tx_cmd.len = cpu_to_le16(cmd_len);
|
|
|
|
if (priv->iw_mode == IEEE80211_IF_TYPE_MNTR)
|
|
scan->filter_flags = RXON_FILTER_PROMISC_MSK;
|
|
|
|
scan->filter_flags |= (RXON_FILTER_ACCEPT_GRP_MSK |
|
|
RXON_FILTER_BCON_AWARE_MSK);
|
|
|
|
if (direct_mask)
|
|
scan->channel_count =
|
|
iwl_get_channels_for_scan(priv, band, 1, /* active */
|
|
direct_mask,
|
|
(void *)&scan->data[le16_to_cpu(scan->tx_cmd.len)]);
|
|
else
|
|
scan->channel_count =
|
|
iwl_get_channels_for_scan(priv, band, 0, /* passive */
|
|
direct_mask,
|
|
(void *)&scan->data[le16_to_cpu(scan->tx_cmd.len)]);
|
|
if (scan->channel_count == 0) {
|
|
IWL_DEBUG_SCAN("channel count %d\n", scan->channel_count);
|
|
goto done;
|
|
}
|
|
|
|
cmd.len += le16_to_cpu(scan->tx_cmd.len) +
|
|
scan->channel_count * sizeof(struct iwl_scan_channel);
|
|
cmd.data = scan;
|
|
scan->len = cpu_to_le16(cmd.len);
|
|
|
|
set_bit(STATUS_SCAN_HW, &priv->status);
|
|
ret = iwl_send_cmd_sync(priv, &cmd);
|
|
if (ret)
|
|
goto done;
|
|
|
|
queue_delayed_work(priv->workqueue, &priv->scan_check,
|
|
IWL_SCAN_CHECK_WATCHDOG);
|
|
|
|
mutex_unlock(&priv->mutex);
|
|
return;
|
|
|
|
done:
|
|
/* inform mac80211 scan aborted */
|
|
queue_work(priv->workqueue, &priv->scan_completed);
|
|
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);
|
|
|
|
if (!iwl_is_ready(priv))
|
|
return;
|
|
|
|
mutex_lock(&priv->mutex);
|
|
|
|
set_bit(STATUS_SCAN_ABORTING, &priv->status);
|
|
iwl_send_scan_abort(priv);
|
|
|
|
mutex_unlock(&priv->mutex);
|
|
}
|
|
|
|
void iwl_setup_scan_deferred_work(struct iwl_priv *priv)
|
|
{
|
|
/* FIXME: move here when resolved PENDING
|
|
* INIT_WORK(&priv->scan_completed, iwl_bg_scan_completed); */
|
|
INIT_WORK(&priv->request_scan, iwl_bg_request_scan);
|
|
INIT_WORK(&priv->abort_scan, iwl_bg_abort_scan);
|
|
INIT_DELAYED_WORK(&priv->scan_check, iwl_bg_scan_check);
|
|
}
|
|
EXPORT_SYMBOL(iwl_setup_scan_deferred_work);
|
|
|