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// SPDX-License-Identifier: GPL-2.0-only
/*
* Scan related functions.
*
* Copyright (c) 2017-2019, Silicon Laboratories, Inc.
* Copyright (c) 2010, ST-Ericsson
*/
#include <net/mac80211.h>
#include "scan.h"
#include "wfx.h"
#include "sta.h"
#include "hif_tx_mib.h"
static void __ieee80211_scan_completed_compat(struct ieee80211_hw *hw,
bool aborted)
{
struct cfg80211_scan_info info = {
.aborted = aborted ? 1 : 0,
};
ieee80211_scan_completed(hw, &info);
}
static void wfx_scan_restart_delayed(struct wfx_vif *wvif)
{
if (wvif->delayed_unjoin) {
wvif->delayed_unjoin = false;
if (!schedule_work(&wvif->unjoin_work))
wfx_tx_unlock(wvif->wdev);
} else if (wvif->delayed_link_loss) {
wvif->delayed_link_loss = 0;
wfx_cqm_bssloss_sm(wvif, 1, 0, 0);
}
}
static int wfx_scan_start(struct wfx_vif *wvif, struct wfx_scan_params *scan)
{
int ret;
int tmo = 500;
if (wvif->state == WFX_STATE_PRE_STA)
return -EBUSY;
tmo += scan->scan_req.num_of_channels *
((20 * (scan->scan_req.max_channel_time)) + 10);
atomic_set(&wvif->scan.in_progress, 1);
atomic_set(&wvif->wdev->scan_in_progress, 1);
schedule_delayed_work(&wvif->scan.timeout, msecs_to_jiffies(tmo));
ret = hif_scan(wvif, scan);
if (ret) {
wfx_scan_failed_cb(wvif);
atomic_set(&wvif->scan.in_progress, 0);
atomic_set(&wvif->wdev->scan_in_progress, 0);
cancel_delayed_work_sync(&wvif->scan.timeout);
wfx_scan_restart_delayed(wvif);
}
return ret;
}
int wfx_hw_scan(struct ieee80211_hw *hw,
struct ieee80211_vif *vif,
struct ieee80211_scan_request *hw_req)
{
struct wfx_dev *wdev = hw->priv;
struct wfx_vif *wvif = (struct wfx_vif *) vif->drv_priv;
struct cfg80211_scan_request *req = &hw_req->req;
struct sk_buff *skb;
int i, ret;
struct hif_mib_template_frame *p;
if (!wvif)
return -EINVAL;
if (wvif->state == WFX_STATE_AP)
return -EOPNOTSUPP;
if (req->n_ssids == 1 && !req->ssids[0].ssid_len)
req->n_ssids = 0;
if (req->n_ssids > HIF_API_MAX_NB_SSIDS)
return -EINVAL;
skb = ieee80211_probereq_get(hw, wvif->vif->addr, NULL, 0, req->ie_len);
if (!skb)
return -ENOMEM;
if (req->ie_len)
memcpy(skb_put(skb, req->ie_len), req->ie, req->ie_len);
mutex_lock(&wdev->conf_mutex);
p = (struct hif_mib_template_frame *)skb_push(skb, 4);
p->frame_type = HIF_TMPLT_PRBREQ;
p->frame_length = cpu_to_le16(skb->len - 4);
ret = hif_set_template_frame(wvif, p);
skb_pull(skb, 4);
if (!ret)
/* Host want to be the probe responder. */
ret = wfx_fwd_probe_req(wvif, true);
if (ret) {
mutex_unlock(&wdev->conf_mutex);
dev_kfree_skb(skb);
return ret;
}
wfx_tx_lock_flush(wdev);
WARN(wvif->scan.req, "unexpected concurrent scan");
wvif->scan.req = req;
wvif->scan.n_ssids = 0;
wvif->scan.status = 0;
wvif->scan.begin = &req->channels[0];
wvif->scan.curr = wvif->scan.begin;
wvif->scan.end = &req->channels[req->n_channels];
wvif->scan.output_power = wdev->output_power;
for (i = 0; i < req->n_ssids; ++i) {
struct hif_ssid_def *dst = &wvif->scan.ssids[wvif->scan.n_ssids];
memcpy(&dst->ssid[0], req->ssids[i].ssid, sizeof(dst->ssid));
dst->ssid_length = req->ssids[i].ssid_len;
++wvif->scan.n_ssids;
}
mutex_unlock(&wdev->conf_mutex);
if (skb)
dev_kfree_skb(skb);
schedule_work(&wvif->scan.work);
return 0;
}
void wfx_scan_work(struct work_struct *work)
{
struct wfx_vif *wvif = container_of(work, struct wfx_vif, scan.work);
struct ieee80211_channel **it;
struct wfx_scan_params scan = {
.scan_req.scan_type.type = 0, /* Foreground */
};
struct ieee80211_channel *first;
bool first_run = (wvif->scan.begin == wvif->scan.curr &&
wvif->scan.begin != wvif->scan.end);
int i;
down(&wvif->scan.lock);
mutex_lock(&wvif->wdev->conf_mutex);
if (first_run) {
if (wvif->state == WFX_STATE_STA &&
!(wvif->powersave_mode.pm_mode.enter_psm)) {
struct hif_req_set_pm_mode pm = wvif->powersave_mode;
pm.pm_mode.enter_psm = 1;
wfx_set_pm(wvif, &pm);
}
}
if (!wvif->scan.req || wvif->scan.curr == wvif->scan.end) {
if (wvif->scan.output_power != wvif->wdev->output_power)
hif_set_output_power(wvif,
wvif->wdev->output_power * 10);
if (wvif->scan.status < 0)
dev_warn(wvif->wdev->dev, "scan failed\n");
else if (wvif->scan.req)
dev_dbg(wvif->wdev->dev, "scan completed\n");
else
dev_dbg(wvif->wdev->dev, "scan canceled\n");
wvif->scan.req = NULL;
wfx_scan_restart_delayed(wvif);
wfx_tx_unlock(wvif->wdev);
mutex_unlock(&wvif->wdev->conf_mutex);
__ieee80211_scan_completed_compat(wvif->wdev->hw,
wvif->scan.status ? 1 : 0);
up(&wvif->scan.lock);
if (wvif->state == WFX_STATE_STA &&
!(wvif->powersave_mode.pm_mode.enter_psm))
wfx_set_pm(wvif, &wvif->powersave_mode);
return;
}
first = *wvif->scan.curr;
for (it = wvif->scan.curr + 1, i = 1;
it != wvif->scan.end && i < HIF_API_MAX_NB_CHANNELS;
++it, ++i) {
if ((*it)->band != first->band)
break;
if (((*it)->flags ^ first->flags) &
IEEE80211_CHAN_NO_IR)
break;
if (!(first->flags & IEEE80211_CHAN_NO_IR) &&
(*it)->max_power != first->max_power)
break;
}
scan.scan_req.band = first->band;
if (wvif->scan.req->no_cck)
scan.scan_req.max_transmit_rate = API_RATE_INDEX_G_6MBPS;
else
scan.scan_req.max_transmit_rate = API_RATE_INDEX_B_1MBPS;
scan.scan_req.num_of_probe_requests =
(first->flags & IEEE80211_CHAN_NO_IR) ? 0 : 2;
scan.scan_req.num_of_ssi_ds = wvif->scan.n_ssids;
scan.ssids = &wvif->scan.ssids[0];
scan.scan_req.num_of_channels = it - wvif->scan.curr;
scan.scan_req.probe_delay = 100;
// FIXME: Check if FW can do active scan while joined.
if (wvif->state == WFX_STATE_STA) {
scan.scan_req.scan_type.type = 1;
scan.scan_req.scan_flags.fbg = 1;
}
scan.ch = kcalloc(scan.scan_req.num_of_channels,
sizeof(u8), GFP_KERNEL);
if (!scan.ch) {
wvif->scan.status = -ENOMEM;
goto fail;
}
for (i = 0; i < scan.scan_req.num_of_channels; ++i)
scan.ch[i] = wvif->scan.curr[i]->hw_value;
if (wvif->scan.curr[0]->flags & IEEE80211_CHAN_NO_IR) {
scan.scan_req.min_channel_time = 50;
scan.scan_req.max_channel_time = 150;
} else {
scan.scan_req.min_channel_time = 10;
scan.scan_req.max_channel_time = 50;
}
if (!(first->flags & IEEE80211_CHAN_NO_IR) &&
wvif->scan.output_power != first->max_power) {
wvif->scan.output_power = first->max_power;
hif_set_output_power(wvif, wvif->scan.output_power * 10);
}
wvif->scan.status = wfx_scan_start(wvif, &scan);
kfree(scan.ch);
if (wvif->scan.status)
goto fail;
wvif->scan.curr = it;
mutex_unlock(&wvif->wdev->conf_mutex);
return;
fail:
wvif->scan.curr = wvif->scan.end;
mutex_unlock(&wvif->wdev->conf_mutex);
up(&wvif->scan.lock);
schedule_work(&wvif->scan.work);
}
static void wfx_scan_complete(struct wfx_vif *wvif)
{
up(&wvif->scan.lock);
atomic_set(&wvif->wdev->scan_in_progress, 0);
wfx_scan_work(&wvif->scan.work);
}
void wfx_scan_failed_cb(struct wfx_vif *wvif)
{
if (cancel_delayed_work_sync(&wvif->scan.timeout) > 0) {
wvif->scan.status = -EIO;
schedule_work(&wvif->scan.timeout.work);
}
}
void wfx_scan_complete_cb(struct wfx_vif *wvif, struct hif_ind_scan_cmpl *arg)
{
if (cancel_delayed_work_sync(&wvif->scan.timeout) > 0) {
wvif->scan.status = 1;
schedule_work(&wvif->scan.timeout.work);
}
}
void wfx_scan_timeout(struct work_struct *work)
{
struct wfx_vif *wvif = container_of(work, struct wfx_vif,
scan.timeout.work);
if (atomic_xchg(&wvif->scan.in_progress, 0)) {
if (wvif->scan.status > 0) {
wvif->scan.status = 0;
} else if (!wvif->scan.status) {
dev_warn(wvif->wdev->dev, "timeout waiting for scan complete notification\n");
wvif->scan.status = -ETIMEDOUT;
wvif->scan.curr = wvif->scan.end;
hif_stop_scan(wvif);
}
wfx_scan_complete(wvif);
}
}
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