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kernel/drivers/net/wireless/ti/wlcore/scan.c

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C
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/*
* This file is part of wl1271
*
* Copyright (C) 2009-2010 Nokia Corporation
*
* Contact: Luciano Coelho <luciano.coelho@nokia.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 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 St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
*/
#include <linux/ieee80211.h>
#include "wlcore.h"
#include "debug.h"
#include "cmd.h"
#include "scan.h"
#include "acx.h"
#include "ps.h"
#include "tx.h"
void wl1271_scan_complete_work(struct work_struct *work)
{
struct delayed_work *dwork;
struct wl1271 *wl;
struct wl12xx_vif *wlvif;
struct cfg80211_scan_info info = {
.aborted = false,
};
int ret;
dwork = to_delayed_work(work);
wl = container_of(dwork, struct wl1271, scan_complete_work);
wl1271_debug(DEBUG_SCAN, "Scanning complete");
mutex_lock(&wl->mutex);
if (unlikely(wl->state != WLCORE_STATE_ON))
goto out;
if (wl->scan.state == WL1271_SCAN_STATE_IDLE)
goto out;
wlvif = wl->scan_wlvif;
/*
* Rearm the tx watchdog just before idling scan. This
* prevents just-finished scans from triggering the watchdog
*/
wl12xx_rearm_tx_watchdog_locked(wl);
wl->scan.state = WL1271_SCAN_STATE_IDLE;
memset(wl->scan.scanned_ch, 0, sizeof(wl->scan.scanned_ch));
wl->scan.req = NULL;
wl->scan_wlvif = NULL;
ret = wl1271_ps_elp_wakeup(wl);
if (ret < 0)
goto out;
if (test_bit(WLVIF_FLAG_STA_ASSOCIATED, &wlvif->flags)) {
/* restore hardware connection monitoring template */
wl1271_cmd_build_ap_probe_req(wl, wlvif, wlvif->probereq);
}
wl1271_ps_elp_sleep(wl);
if (wl->scan.failed) {
wl1271_info("Scan completed due to error.");
wl12xx_queue_recovery_work(wl);
}
wlcore_cmd_regdomain_config_locked(wl);
ieee80211_scan_completed(wl->hw, &info);
out:
mutex_unlock(&wl->mutex);
}
static void wlcore_started_vifs_iter(void *data, u8 *mac,
struct ieee80211_vif *vif)
{
struct wl12xx_vif *wlvif = wl12xx_vif_to_data(vif);
bool active = false;
int *count = (int *)data;
/*
* count active interfaces according to interface type.
* checking only bss_conf.idle is bad for some cases, e.g.
* we don't want to count sta in p2p_find as active interface.
*/
switch (wlvif->bss_type) {
case BSS_TYPE_STA_BSS:
if (test_bit(WLVIF_FLAG_STA_ASSOCIATED, &wlvif->flags))
active = true;
break;
case BSS_TYPE_AP_BSS:
if (wlvif->wl->active_sta_count > 0)
active = true;
break;
default:
break;
}
if (active)
(*count)++;
}
static int wlcore_count_started_vifs(struct wl1271 *wl)
{
int count = 0;
ieee80211_iterate_active_interfaces_atomic(wl->hw,
IEEE80211_IFACE_ITER_RESUME_ALL,
wlcore_started_vifs_iter, &count);
return count;
}
static int
wlcore_scan_get_channels(struct wl1271 *wl,
struct ieee80211_channel *req_channels[],
u32 n_channels,
u32 n_ssids,
struct conn_scan_ch_params *channels,
u32 band, bool radar, bool passive,
int start, int max_channels,
u8 *n_pactive_ch,
int scan_type)
{
int i, j;
u32 flags;
bool force_passive = !n_ssids;
u32 min_dwell_time_active, max_dwell_time_active;
u32 dwell_time_passive, dwell_time_dfs;
/* configure dwell times according to scan type */
if (scan_type == SCAN_TYPE_SEARCH) {
struct conf_scan_settings *c = &wl->conf.scan;
bool active_vif_exists = !!wlcore_count_started_vifs(wl);
min_dwell_time_active = active_vif_exists ?
c->min_dwell_time_active :
c->min_dwell_time_active_long;
max_dwell_time_active = active_vif_exists ?
c->max_dwell_time_active :
c->max_dwell_time_active_long;
dwell_time_passive = c->dwell_time_passive;
dwell_time_dfs = c->dwell_time_dfs;
} else {
struct conf_sched_scan_settings *c = &wl->conf.sched_scan;
u32 delta_per_probe;
if (band == NL80211_BAND_5GHZ)
delta_per_probe = c->dwell_time_delta_per_probe_5;
else
delta_per_probe = c->dwell_time_delta_per_probe;
min_dwell_time_active = c->base_dwell_time +
n_ssids * c->num_probe_reqs * delta_per_probe;
max_dwell_time_active = min_dwell_time_active +
c->max_dwell_time_delta;
dwell_time_passive = c->dwell_time_passive;
dwell_time_dfs = c->dwell_time_dfs;
}
min_dwell_time_active = DIV_ROUND_UP(min_dwell_time_active, 1000);
max_dwell_time_active = DIV_ROUND_UP(max_dwell_time_active, 1000);
dwell_time_passive = DIV_ROUND_UP(dwell_time_passive, 1000);
dwell_time_dfs = DIV_ROUND_UP(dwell_time_dfs, 1000);
for (i = 0, j = start;
i < n_channels && j < max_channels;
i++) {
flags = req_channels[i]->flags;
if (force_passive)
flags |= IEEE80211_CHAN_NO_IR;
if ((req_channels[i]->band == band) &&
!(flags & IEEE80211_CHAN_DISABLED) &&
(!!(flags & IEEE80211_CHAN_RADAR) == radar) &&
/* if radar is set, we ignore the passive flag */
(radar ||
!!(flags & IEEE80211_CHAN_NO_IR) == passive)) {
if (flags & IEEE80211_CHAN_RADAR) {
channels[j].flags |= SCAN_CHANNEL_FLAGS_DFS;
channels[j].passive_duration =
cpu_to_le16(dwell_time_dfs);
} else {
channels[j].passive_duration =
cpu_to_le16(dwell_time_passive);
}
channels[j].min_duration =
cpu_to_le16(min_dwell_time_active);
channels[j].max_duration =
cpu_to_le16(max_dwell_time_active);
channels[j].tx_power_att = req_channels[i]->max_power;
channels[j].channel = req_channels[i]->hw_value;
if (n_pactive_ch &&
(band == NL80211_BAND_2GHZ) &&
(channels[j].channel >= 12) &&
(channels[j].channel <= 14) &&
(flags & IEEE80211_CHAN_NO_IR) &&
!force_passive) {
/* pactive channels treated as DFS */
channels[j].flags = SCAN_CHANNEL_FLAGS_DFS;
/*
* n_pactive_ch is counted down from the end of
* the passive channel list
*/
(*n_pactive_ch)++;
wl1271_debug(DEBUG_SCAN, "n_pactive_ch = %d",
*n_pactive_ch);
}
wl1271_debug(DEBUG_SCAN, "freq %d, ch. %d, flags 0x%x, power %d, min/max_dwell %d/%d%s%s",
req_channels[i]->center_freq,
req_channels[i]->hw_value,
req_channels[i]->flags,
req_channels[i]->max_power,
min_dwell_time_active,
max_dwell_time_active,
flags & IEEE80211_CHAN_RADAR ?
", DFS" : "",
flags & IEEE80211_CHAN_NO_IR ?
", NO-IR" : "");
j++;
}
}
return j - start;
}
bool
wlcore_set_scan_chan_params(struct wl1271 *wl,
struct wlcore_scan_channels *cfg,
struct ieee80211_channel *channels[],
u32 n_channels,
u32 n_ssids,
int scan_type)
{
u8 n_pactive_ch = 0;
cfg->passive[0] =
wlcore_scan_get_channels(wl,
channels,
n_channels,
n_ssids,
cfg->channels_2,
NL80211_BAND_2GHZ,
false, true, 0,
MAX_CHANNELS_2GHZ,
&n_pactive_ch,
scan_type);
cfg->active[0] =
wlcore_scan_get_channels(wl,
channels,
n_channels,
n_ssids,
cfg->channels_2,
NL80211_BAND_2GHZ,
false, false,
cfg->passive[0],
MAX_CHANNELS_2GHZ,
&n_pactive_ch,
scan_type);
cfg->passive[1] =
wlcore_scan_get_channels(wl,
channels,
n_channels,
n_ssids,
cfg->channels_5,
NL80211_BAND_5GHZ,
false, true, 0,
wl->max_channels_5,
&n_pactive_ch,
scan_type);
cfg->dfs =
wlcore_scan_get_channels(wl,
channels,
n_channels,
n_ssids,
cfg->channels_5,
NL80211_BAND_5GHZ,
true, true,
cfg->passive[1],
wl->max_channels_5,
&n_pactive_ch,
scan_type);
cfg->active[1] =
wlcore_scan_get_channels(wl,
channels,
n_channels,
n_ssids,
cfg->channels_5,
NL80211_BAND_5GHZ,
false, false,
cfg->passive[1] + cfg->dfs,
wl->max_channels_5,
&n_pactive_ch,
scan_type);
/* 802.11j channels are not supported yet */
cfg->passive[2] = 0;
cfg->active[2] = 0;
cfg->passive_active = n_pactive_ch;
wl1271_debug(DEBUG_SCAN, " 2.4GHz: active %d passive %d",
cfg->active[0], cfg->passive[0]);
wl1271_debug(DEBUG_SCAN, " 5GHz: active %d passive %d",
cfg->active[1], cfg->passive[1]);
wl1271_debug(DEBUG_SCAN, " DFS: %d", cfg->dfs);
return cfg->passive[0] || cfg->active[0] ||
cfg->passive[1] || cfg->active[1] || cfg->dfs ||
cfg->passive[2] || cfg->active[2];
}
EXPORT_SYMBOL_GPL(wlcore_set_scan_chan_params);
int wlcore_scan(struct wl1271 *wl, struct ieee80211_vif *vif,
const u8 *ssid, size_t ssid_len,
struct cfg80211_scan_request *req)
{
struct wl12xx_vif *wlvif = wl12xx_vif_to_data(vif);
/*
* cfg80211 should guarantee that we don't get more channels
* than what we have registered.
*/
BUG_ON(req->n_channels > WL1271_MAX_CHANNELS);
if (wl->scan.state != WL1271_SCAN_STATE_IDLE)
return -EBUSY;
wl->scan.state = WL1271_SCAN_STATE_2GHZ_ACTIVE;
if (ssid_len && ssid) {
wl->scan.ssid_len = ssid_len;
memcpy(wl->scan.ssid, ssid, ssid_len);
} else {
wl->scan.ssid_len = 0;
}
wl->scan_wlvif = wlvif;
wl->scan.req = req;
memset(wl->scan.scanned_ch, 0, sizeof(wl->scan.scanned_ch));
/* we assume failure so that timeout scenarios are handled correctly */
wl->scan.failed = true;
ieee80211_queue_delayed_work(wl->hw, &wl->scan_complete_work,
msecs_to_jiffies(WL1271_SCAN_TIMEOUT));
wl->ops->scan_start(wl, wlvif, req);
return 0;
}
/* Returns the scan type to be used or a negative value on error */
int
wlcore_scan_sched_scan_ssid_list(struct wl1271 *wl,
struct wl12xx_vif *wlvif,
struct cfg80211_sched_scan_request *req)
{
struct wl1271_cmd_sched_scan_ssid_list *cmd = NULL;
struct cfg80211_match_set *sets = req->match_sets;
struct cfg80211_ssid *ssids = req->ssids;
int ret = 0, type, i, j, n_match_ssids = 0;
wl1271_debug((DEBUG_CMD | DEBUG_SCAN), "cmd sched scan ssid list");
/* count the match sets that contain SSIDs */
for (i = 0; i < req->n_match_sets; i++)
if (sets[i].ssid.ssid_len > 0)
n_match_ssids++;
/* No filter, no ssids or only bcast ssid */
if (!n_match_ssids &&
(!req->n_ssids ||
(req->n_ssids == 1 && req->ssids[0].ssid_len == 0))) {
type = SCAN_SSID_FILTER_ANY;
goto out;
}
cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
if (!cmd) {
ret = -ENOMEM;
goto out;
}
cmd->role_id = wlvif->role_id;
if (!n_match_ssids) {
/* No filter, with ssids */
type = SCAN_SSID_FILTER_DISABLED;
for (i = 0; i < req->n_ssids; i++) {
cmd->ssids[cmd->n_ssids].type = (ssids[i].ssid_len) ?
SCAN_SSID_TYPE_HIDDEN : SCAN_SSID_TYPE_PUBLIC;
cmd->ssids[cmd->n_ssids].len = ssids[i].ssid_len;
memcpy(cmd->ssids[cmd->n_ssids].ssid, ssids[i].ssid,
ssids[i].ssid_len);
cmd->n_ssids++;
}
} else {
type = SCAN_SSID_FILTER_LIST;
/* Add all SSIDs from the filters */
for (i = 0; i < req->n_match_sets; i++) {
/* ignore sets without SSIDs */
if (!sets[i].ssid.ssid_len)
continue;
cmd->ssids[cmd->n_ssids].type = SCAN_SSID_TYPE_PUBLIC;
cmd->ssids[cmd->n_ssids].len = sets[i].ssid.ssid_len;
memcpy(cmd->ssids[cmd->n_ssids].ssid,
sets[i].ssid.ssid, sets[i].ssid.ssid_len);
cmd->n_ssids++;
}
if ((req->n_ssids > 1) ||
(req->n_ssids == 1 && req->ssids[0].ssid_len > 0)) {
/*
* Mark all the SSIDs passed in the SSID list as HIDDEN,
* so they're used in probe requests.
*/
for (i = 0; i < req->n_ssids; i++) {
if (!req->ssids[i].ssid_len)
continue;
for (j = 0; j < cmd->n_ssids; j++)
if ((req->ssids[i].ssid_len ==
cmd->ssids[j].len) &&
!memcmp(req->ssids[i].ssid,
cmd->ssids[j].ssid,
req->ssids[i].ssid_len)) {
cmd->ssids[j].type =
SCAN_SSID_TYPE_HIDDEN;
break;
}
/* Fail if SSID isn't present in the filters */
if (j == cmd->n_ssids) {
ret = -EINVAL;
goto out_free;
}
}
}
}
ret = wl1271_cmd_send(wl, CMD_CONNECTION_SCAN_SSID_CFG, cmd,
sizeof(*cmd), 0);
if (ret < 0) {
wl1271_error("cmd sched scan ssid list failed");
goto out_free;
}
out_free:
kfree(cmd);
out:
if (ret < 0)
return ret;
return type;
}
EXPORT_SYMBOL_GPL(wlcore_scan_sched_scan_ssid_list);
void wlcore_scan_sched_scan_results(struct wl1271 *wl)
{
wl1271_debug(DEBUG_SCAN, "got periodic scan results");
ieee80211_sched_scan_results(wl->hw);
}
EXPORT_SYMBOL_GPL(wlcore_scan_sched_scan_results);
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