blob: 2bed3ae914c219ab36d9ebc22f5c23a98a7a79d3 [file] [log] [blame]
/******************************************************************************
*
* GPL LICENSE SUMMARY
*
* Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
* USA
*
* The full GNU General Public License is included in this distribution
* in the file called LICENSE.GPL.
*
* Contact Information:
* Intel Linux Wireless <ilw@linux.intel.com>
* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
*****************************************************************************/
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/etherdevice.h>
#include <net/mac80211.h>
#include "iwl-eeprom.h"
#include "iwl-dev.h"
#include "iwl-core.h"
#include "iwl-sta.h"
#include "iwl-io.h"
#include "iwl-helpers.h"
/* For active scan, listen ACTIVE_DWELL_TIME (msec) on each channel after
* sending probe req. This should be set long enough to hear probe responses
* from more than one AP. */
#define IL_ACTIVE_DWELL_TIME_24 (30) /* all times in msec */
#define IL_ACTIVE_DWELL_TIME_52 (20)
#define IL_ACTIVE_DWELL_FACTOR_24GHZ (3)
#define IL_ACTIVE_DWELL_FACTOR_52GHZ (2)
/* For passive scan, listen PASSIVE_DWELL_TIME (msec) on each channel.
* Must be set longer than active dwell time.
* For the most reliable scan, set > AP beacon interval (typically 100msec). */
#define IL_PASSIVE_DWELL_TIME_24 (20) /* all times in msec */
#define IL_PASSIVE_DWELL_TIME_52 (10)
#define IL_PASSIVE_DWELL_BASE (100)
#define IL_CHANNEL_TUNE_TIME 5
static int il_send_scan_abort(struct il_priv *il)
{
int ret;
struct il_rx_pkt *pkt;
struct il_host_cmd cmd = {
.id = C_SCAN_ABORT,
.flags = CMD_WANT_SKB,
};
/* Exit instantly with error when device is not ready
* to receive scan abort command or it does not perform
* hardware scan currently */
if (!test_bit(S_READY, &il->status) ||
!test_bit(S_GEO_CONFIGURED, &il->status) ||
!test_bit(S_SCAN_HW, &il->status) ||
test_bit(S_FW_ERROR, &il->status) ||
test_bit(S_EXIT_PENDING, &il->status))
return -EIO;
ret = il_send_cmd_sync(il, &cmd);
if (ret)
return ret;
pkt = (struct il_rx_pkt *)cmd.reply_page;
if (pkt->u.status != CAN_ABORT_STATUS) {
/* The scan abort will return 1 for success or
* 2 for "failure". A failure condition can be
* due to simply not being in an active scan which
* can occur if we send the scan abort before we
* the microcode has notified us that a scan is
* completed. */
D_SCAN("SCAN_ABORT ret %d.\n", pkt->u.status);
ret = -EIO;
}
il_free_pages(il, cmd.reply_page);
return ret;
}
static void il_complete_scan(struct il_priv *il, bool aborted)
{
/* check if scan was requested from mac80211 */
if (il->scan_request) {
D_SCAN("Complete scan in mac80211\n");
ieee80211_scan_completed(il->hw, aborted);
}
il->scan_vif = NULL;
il->scan_request = NULL;
}
void il_force_scan_end(struct il_priv *il)
{
lockdep_assert_held(&il->mutex);
if (!test_bit(S_SCANNING, &il->status)) {
D_SCAN("Forcing scan end while not scanning\n");
return;
}
D_SCAN("Forcing scan end\n");
clear_bit(S_SCANNING, &il->status);
clear_bit(S_SCAN_HW, &il->status);
clear_bit(S_SCAN_ABORTING, &il->status);
il_complete_scan(il, true);
}
static void il_do_scan_abort(struct il_priv *il)
{
int ret;
lockdep_assert_held(&il->mutex);
if (!test_bit(S_SCANNING, &il->status)) {
D_SCAN("Not performing scan to abort\n");
return;
}
if (test_and_set_bit(S_SCAN_ABORTING, &il->status)) {
D_SCAN("Scan abort in progress\n");
return;
}
ret = il_send_scan_abort(il);
if (ret) {
D_SCAN("Send scan abort failed %d\n", ret);
il_force_scan_end(il);
} else
D_SCAN("Successfully send scan abort\n");
}
/**
* il_scan_cancel - Cancel any currently executing HW scan
*/
int il_scan_cancel(struct il_priv *il)
{
D_SCAN("Queuing abort scan\n");
queue_work(il->workqueue, &il->abort_scan);
return 0;
}
EXPORT_SYMBOL(il_scan_cancel);
/**
* il_scan_cancel_timeout - Cancel any currently executing HW scan
* @ms: amount of time to wait (in milliseconds) for scan to abort
*
*/
int il_scan_cancel_timeout(struct il_priv *il, unsigned long ms)
{
unsigned long timeout = jiffies + msecs_to_jiffies(ms);
lockdep_assert_held(&il->mutex);
D_SCAN("Scan cancel timeout\n");
il_do_scan_abort(il);
while (time_before_eq(jiffies, timeout)) {
if (!test_bit(S_SCAN_HW, &il->status))
break;
msleep(20);
}
return test_bit(S_SCAN_HW, &il->status);
}
EXPORT_SYMBOL(il_scan_cancel_timeout);
/* Service response to C_SCAN (0x80) */
static void il_rx_reply_scan(struct il_priv *il,
struct il_rx_buf *rxb)
{
#ifdef CONFIG_IWLEGACY_DEBUG
struct il_rx_pkt *pkt = rxb_addr(rxb);
struct il_scanreq_notification *notif =
(struct il_scanreq_notification *)pkt->u.raw;
D_SCAN("Scan request status = 0x%x\n", notif->status);
#endif
}
/* Service N_SCAN_START (0x82) */
static void il_rx_scan_start_notif(struct il_priv *il,
struct il_rx_buf *rxb)
{
struct il_rx_pkt *pkt = rxb_addr(rxb);
struct il_scanstart_notification *notif =
(struct il_scanstart_notification *)pkt->u.raw;
il->scan_start_tsf = le32_to_cpu(notif->tsf_low);
D_SCAN("Scan start: "
"%d [802.11%s] "
"(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n",
notif->channel,
notif->band ? "bg" : "a",
le32_to_cpu(notif->tsf_high),
le32_to_cpu(notif->tsf_low),
notif->status, notif->beacon_timer);
}
/* Service N_SCAN_RESULTS (0x83) */
static void il_rx_scan_results_notif(struct il_priv *il,
struct il_rx_buf *rxb)
{
#ifdef CONFIG_IWLEGACY_DEBUG
struct il_rx_pkt *pkt = rxb_addr(rxb);
struct il_scanresults_notification *notif =
(struct il_scanresults_notification *)pkt->u.raw;
D_SCAN("Scan ch.res: "
"%d [802.11%s] "
"(TSF: 0x%08X:%08X) - %d "
"elapsed=%lu usec\n",
notif->channel,
notif->band ? "bg" : "a",
le32_to_cpu(notif->tsf_high),
le32_to_cpu(notif->tsf_low),
le32_to_cpu(notif->stats[0]),
le32_to_cpu(notif->tsf_low) - il->scan_start_tsf);
#endif
}
/* Service N_SCAN_COMPLETE (0x84) */
static void il_rx_scan_complete_notif(struct il_priv *il,
struct il_rx_buf *rxb)
{
#ifdef CONFIG_IWLEGACY_DEBUG
struct il_rx_pkt *pkt = rxb_addr(rxb);
struct il_scancomplete_notification *scan_notif = (void *)pkt->u.raw;
#endif
D_SCAN(
"Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n",
scan_notif->scanned_channels,
scan_notif->tsf_low,
scan_notif->tsf_high, scan_notif->status);
/* The HW is no longer scanning */
clear_bit(S_SCAN_HW, &il->status);
D_SCAN("Scan on %sGHz took %dms\n",
(il->scan_band == IEEE80211_BAND_2GHZ) ? "2.4" : "5.2",
jiffies_to_msecs(jiffies - il->scan_start));
queue_work(il->workqueue, &il->scan_completed);
}
void il_setup_rx_scan_handlers(struct il_priv *il)
{
/* scan handlers */
il->handlers[C_SCAN] = il_rx_reply_scan;
il->handlers[N_SCAN_START] =
il_rx_scan_start_notif;
il->handlers[N_SCAN_RESULTS] =
il_rx_scan_results_notif;
il->handlers[N_SCAN_COMPLETE] =
il_rx_scan_complete_notif;
}
EXPORT_SYMBOL(il_setup_rx_scan_handlers);
inline u16 il_get_active_dwell_time(struct il_priv *il,
enum ieee80211_band band,
u8 n_probes)
{
if (band == IEEE80211_BAND_5GHZ)
return IL_ACTIVE_DWELL_TIME_52 +
IL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1);
else
return IL_ACTIVE_DWELL_TIME_24 +
IL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1);
}
EXPORT_SYMBOL(il_get_active_dwell_time);
u16 il_get_passive_dwell_time(struct il_priv *il,
enum ieee80211_band band,
struct ieee80211_vif *vif)
{
struct il_rxon_context *ctx = &il->ctx;
u16 value;
u16 passive = (band == IEEE80211_BAND_2GHZ) ?
IL_PASSIVE_DWELL_BASE + IL_PASSIVE_DWELL_TIME_24 :
IL_PASSIVE_DWELL_BASE + IL_PASSIVE_DWELL_TIME_52;
if (il_is_any_associated(il)) {
/*
* If we're associated, we clamp the maximum passive
* dwell time to be 98% of the smallest beacon interval
* (minus 2 * channel tune time)
*/
value = ctx->vif ? ctx->vif->bss_conf.beacon_int : 0;
if (value > IL_PASSIVE_DWELL_BASE || !value)
value = IL_PASSIVE_DWELL_BASE;
value = (value * 98) / 100 - IL_CHANNEL_TUNE_TIME * 2;
passive = min(value, passive);
}
return passive;
}
EXPORT_SYMBOL(il_get_passive_dwell_time);
void il_init_scan_params(struct il_priv *il)
{
u8 ant_idx = fls(il->hw_params.valid_tx_ant) - 1;
if (!il->scan_tx_ant[IEEE80211_BAND_5GHZ])
il->scan_tx_ant[IEEE80211_BAND_5GHZ] = ant_idx;
if (!il->scan_tx_ant[IEEE80211_BAND_2GHZ])
il->scan_tx_ant[IEEE80211_BAND_2GHZ] = ant_idx;
}
EXPORT_SYMBOL(il_init_scan_params);
static int il_scan_initiate(struct il_priv *il,
struct ieee80211_vif *vif)
{
int ret;
lockdep_assert_held(&il->mutex);
if (WARN_ON(!il->cfg->ops->utils->request_scan))
return -EOPNOTSUPP;
cancel_delayed_work(&il->scan_check);
if (!il_is_ready_rf(il)) {
IL_WARN("Request scan called when driver not ready.\n");
return -EIO;
}
if (test_bit(S_SCAN_HW, &il->status)) {
D_SCAN(
"Multiple concurrent scan requests in parallel.\n");
return -EBUSY;
}
if (test_bit(S_SCAN_ABORTING, &il->status)) {
D_SCAN("Scan request while abort pending.\n");
return -EBUSY;
}
D_SCAN("Starting scan...\n");
set_bit(S_SCANNING, &il->status);
il->scan_start = jiffies;
ret = il->cfg->ops->utils->request_scan(il, vif);
if (ret) {
clear_bit(S_SCANNING, &il->status);
return ret;
}
queue_delayed_work(il->workqueue, &il->scan_check,
IL_SCAN_CHECK_WATCHDOG);
return 0;
}
int il_mac_hw_scan(struct ieee80211_hw *hw,
struct ieee80211_vif *vif,
struct cfg80211_scan_request *req)
{
struct il_priv *il = hw->priv;
int ret;
D_MAC80211("enter\n");
if (req->n_channels == 0)
return -EINVAL;
mutex_lock(&il->mutex);
if (test_bit(S_SCANNING, &il->status)) {
D_SCAN("Scan already in progress.\n");
ret = -EAGAIN;
goto out_unlock;
}
/* mac80211 will only ask for one band at a time */
il->scan_request = req;
il->scan_vif = vif;
il->scan_band = req->channels[0]->band;
ret = il_scan_initiate(il, vif);
D_MAC80211("leave\n");
out_unlock:
mutex_unlock(&il->mutex);
return ret;
}
EXPORT_SYMBOL(il_mac_hw_scan);
static void il_bg_scan_check(struct work_struct *data)
{
struct il_priv *il =
container_of(data, struct il_priv, scan_check.work);
D_SCAN("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(&il->mutex);
il_force_scan_end(il);
mutex_unlock(&il->mutex);
}
/**
* il_fill_probe_req - fill in all required fields and IE for probe request
*/
u16
il_fill_probe_req(struct il_priv *il, 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, il_bcast_addr, ETH_ALEN);
memcpy(frame->sa, ta, ETH_ALEN);
memcpy(frame->bssid, il_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;
}
EXPORT_SYMBOL(il_fill_probe_req);
static void il_bg_abort_scan(struct work_struct *work)
{
struct il_priv *il = container_of(work, struct il_priv, abort_scan);
D_SCAN("Abort scan work\n");
/* We keep scan_check work queued in case when firmware will not
* report back scan completed notification */
mutex_lock(&il->mutex);
il_scan_cancel_timeout(il, 200);
mutex_unlock(&il->mutex);
}
static void il_bg_scan_completed(struct work_struct *work)
{
struct il_priv *il =
container_of(work, struct il_priv, scan_completed);
bool aborted;
D_SCAN("Completed scan.\n");
cancel_delayed_work(&il->scan_check);
mutex_lock(&il->mutex);
aborted = test_and_clear_bit(S_SCAN_ABORTING, &il->status);
if (aborted)
D_SCAN("Aborted scan completed.\n");
if (!test_and_clear_bit(S_SCANNING, &il->status)) {
D_SCAN("Scan already completed.\n");
goto out_settings;
}
il_complete_scan(il, aborted);
out_settings:
/* Can we still talk to firmware ? */
if (!il_is_ready_rf(il))
goto out;
/*
* We do not commit power settings while scan is pending,
* do it now if the settings changed.
*/
il_power_set_mode(il, &il->power_data.sleep_cmd_next, false);
il_set_tx_power(il, il->tx_power_next, false);
il->cfg->ops->utils->post_scan(il);
out:
mutex_unlock(&il->mutex);
}
void il_setup_scan_deferred_work(struct il_priv *il)
{
INIT_WORK(&il->scan_completed, il_bg_scan_completed);
INIT_WORK(&il->abort_scan, il_bg_abort_scan);
INIT_DELAYED_WORK(&il->scan_check, il_bg_scan_check);
}
EXPORT_SYMBOL(il_setup_scan_deferred_work);
void il_cancel_scan_deferred_work(struct il_priv *il)
{
cancel_work_sync(&il->abort_scan);
cancel_work_sync(&il->scan_completed);
if (cancel_delayed_work_sync(&il->scan_check)) {
mutex_lock(&il->mutex);
il_force_scan_end(il);
mutex_unlock(&il->mutex);
}
}
EXPORT_SYMBOL(il_cancel_scan_deferred_work);