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// SPDX-License-Identifier: GPL-2.0-only
/*
* Scan related functions.
*
* Copyright (c) 2017-2020, 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 wfx_ieee80211_scan_completed_compat(struct ieee80211_hw *hw, bool aborted)
{
struct cfg80211_scan_info info = {
.aborted = aborted,
};
ieee80211_scan_completed(hw, &info);
}
static int update_probe_tmpl(struct wfx_vif *wvif, struct cfg80211_scan_request *req)
{
struct ieee80211_vif *vif = wvif_to_vif(wvif);
struct sk_buff *skb;
skb = ieee80211_probereq_get(wvif->wdev->hw, vif->addr, NULL, 0,
req->ie_len);
if (!skb)
return -ENOMEM;
skb_put_data(skb, req->ie, req->ie_len);
wfx_hif_set_template_frame(wvif, skb, HIF_TMPLT_PRBREQ, 0);
dev_kfree_skb(skb);
return 0;
}
static int send_scan_req(struct wfx_vif *wvif, struct cfg80211_scan_request *req, int start_idx)
{
struct ieee80211_vif *vif = wvif_to_vif(wvif);
struct ieee80211_channel *ch_start, *ch_cur;
int i, ret;
for (i = start_idx; i < req->n_channels; i++) {
ch_start = req->channels[start_idx];
ch_cur = req->channels[i];
WARN(ch_cur->band != NL80211_BAND_2GHZ, "band not supported");
if (ch_cur->max_power != ch_start->max_power)
break;
if ((ch_cur->flags ^ ch_start->flags) & IEEE80211_CHAN_NO_IR)
break;
}
wfx_tx_lock_flush(wvif->wdev);
wvif->scan_abort = false;
reinit_completion(&wvif->scan_complete);
ret = wfx_hif_scan(wvif, req, start_idx, i - start_idx);
if (ret) {
wfx_tx_unlock(wvif->wdev);
return -EIO;
}
ret = wait_for_completion_timeout(&wvif->scan_complete, 1 * HZ);
if (!ret) {
wfx_hif_stop_scan(wvif);
ret = wait_for_completion_timeout(&wvif->scan_complete, 1 * HZ);
dev_dbg(wvif->wdev->dev, "scan timeout (%d channels done)\n",
wvif->scan_nb_chan_done);
}
if (!ret) {
dev_err(wvif->wdev->dev, "scan didn't stop\n");
ret = -ETIMEDOUT;
} else if (wvif->scan_abort) {
dev_notice(wvif->wdev->dev, "scan abort\n");
ret = -ECONNABORTED;
} else if (wvif->scan_nb_chan_done > i - start_idx) {
ret = -EIO;
} else {
ret = wvif->scan_nb_chan_done;
}
if (req->channels[start_idx]->max_power != vif->bss_conf.txpower)
wfx_hif_set_output_power(wvif, vif->bss_conf.txpower);
wfx_tx_unlock(wvif->wdev);
return ret;
}
/* It is not really necessary to run scan request asynchronously. However,
* there is a bug in "iw scan" when ieee80211_scan_completed() is called before
* wfx_hw_scan() return
*/
void wfx_hw_scan_work(struct work_struct *work)
{
struct wfx_vif *wvif = container_of(work, struct wfx_vif, scan_work);
struct ieee80211_scan_request *hw_req = wvif->scan_req;
int chan_cur, ret, err;
mutex_lock(&wvif->wdev->conf_mutex);
mutex_lock(&wvif->wdev->scan_lock);
if (wvif->join_in_progress) {
dev_info(wvif->wdev->dev, "abort in-progress REQ_JOIN");
wfx_reset(wvif);
}
update_probe_tmpl(wvif, &hw_req->req);
chan_cur = 0;
err = 0;
do {
ret = send_scan_req(wvif, &hw_req->req, chan_cur);
if (ret > 0) {
chan_cur += ret;
err = 0;
}
if (!ret)
err++;
if (err > 2) {
dev_err(wvif->wdev->dev, "scan has not been able to start\n");
ret = -ETIMEDOUT;
}
} while (ret >= 0 && chan_cur < hw_req->req.n_channels);
mutex_unlock(&wvif->wdev->scan_lock);
mutex_unlock(&wvif->wdev->conf_mutex);
wfx_ieee80211_scan_completed_compat(wvif->wdev->hw, ret < 0);
}
int wfx_hw_scan(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
struct ieee80211_scan_request *hw_req)
{
struct wfx_vif *wvif = (struct wfx_vif *)vif->drv_priv;
WARN_ON(hw_req->req.n_channels > HIF_API_MAX_NB_CHANNELS);
wvif->scan_req = hw_req;
schedule_work(&wvif->scan_work);
return 0;
}
void wfx_cancel_hw_scan(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
{
struct wfx_vif *wvif = (struct wfx_vif *)vif->drv_priv;
wvif->scan_abort = true;
wfx_hif_stop_scan(wvif);
}
void wfx_scan_complete(struct wfx_vif *wvif, int nb_chan_done)
{
wvif->scan_nb_chan_done = nb_chan_done;
complete(&wvif->scan_complete);
}
void wfx_remain_on_channel_work(struct work_struct *work)
{
struct wfx_vif *wvif = container_of(work, struct wfx_vif, remain_on_channel_work);
struct ieee80211_channel *chan = wvif->remain_on_channel_chan;
int duration = wvif->remain_on_channel_duration;
int ret;
/* Hijack scan request to implement Remain-On-Channel */
mutex_lock(&wvif->wdev->conf_mutex);
mutex_lock(&wvif->wdev->scan_lock);
if (wvif->join_in_progress) {
dev_info(wvif->wdev->dev, "abort in-progress REQ_JOIN");
wfx_reset(wvif);
}
wfx_tx_flush(wvif->wdev);
reinit_completion(&wvif->scan_complete);
ret = wfx_hif_scan_uniq(wvif, chan, duration);
if (ret)
goto end;
ieee80211_ready_on_channel(wvif->wdev->hw);
ret = wait_for_completion_timeout(&wvif->scan_complete,
msecs_to_jiffies(duration * 120 / 100));
if (!ret) {
wfx_hif_stop_scan(wvif);
ret = wait_for_completion_timeout(&wvif->scan_complete, 1 * HZ);
dev_dbg(wvif->wdev->dev, "roc timeout\n");
}
if (!ret)
dev_err(wvif->wdev->dev, "roc didn't stop\n");
ieee80211_remain_on_channel_expired(wvif->wdev->hw);
end:
mutex_unlock(&wvif->wdev->scan_lock);
mutex_unlock(&wvif->wdev->conf_mutex);
wfx_bh_request_tx(wvif->wdev);
}
int wfx_remain_on_channel(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
struct ieee80211_channel *chan, int duration,
enum ieee80211_roc_type type)
{
struct wfx_dev *wdev = hw->priv;
struct wfx_vif *wvif = (struct wfx_vif *)vif->drv_priv;
if (wfx_api_older_than(wdev, 3, 10))
return -EOPNOTSUPP;
wvif->remain_on_channel_duration = duration;
wvif->remain_on_channel_chan = chan;
schedule_work(&wvif->remain_on_channel_work);
return 0;
}
int wfx_cancel_remain_on_channel(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
{
struct wfx_vif *wvif = (struct wfx_vif *)vif->drv_priv;
wfx_hif_stop_scan(wvif);
flush_work(&wvif->remain_on_channel_work);
return 0;
}
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