// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Scan related functions.
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*
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* Copyright (c) 2017-2020, Silicon Laboratories, Inc.
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* Copyright (c) 2010, ST-Ericsson
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*/
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#include <net/mac80211.h>
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#include "scan.h"
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#include "wfx.h"
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#include "sta.h"
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#include "hif_tx_mib.h"
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static void __ieee80211_scan_completed_compat(struct ieee80211_hw *hw,
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bool aborted)
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{
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struct cfg80211_scan_info info = {
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.aborted = aborted,
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};
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ieee80211_scan_completed(hw, &info);
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}
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static int update_probe_tmpl(struct wfx_vif *wvif,
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struct cfg80211_scan_request *req)
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{
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struct sk_buff *skb;
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skb = ieee80211_probereq_get(wvif->wdev->hw, wvif->vif->addr,
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NULL, 0, req->ie_len);
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if (!skb)
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return -ENOMEM;
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skb_put_data(skb, req->ie, req->ie_len);
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hif_set_template_frame(wvif, skb, HIF_TMPLT_PRBREQ, 0);
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dev_kfree_skb(skb);
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return 0;
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}
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static int send_scan_req(struct wfx_vif *wvif,
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struct cfg80211_scan_request *req, int start_idx)
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{
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int i, ret, timeout;
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struct ieee80211_channel *ch_start, *ch_cur;
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for (i = start_idx; i < req->n_channels; i++) {
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ch_start = req->channels[start_idx];
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ch_cur = req->channels[i];
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WARN(ch_cur->band != NL80211_BAND_2GHZ, "band not supported");
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if (ch_cur->max_power != ch_start->max_power)
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break;
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if ((ch_cur->flags ^ ch_start->flags) & IEEE80211_CHAN_NO_IR)
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break;
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}
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wfx_tx_lock_flush(wvif->wdev);
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wvif->scan_abort = false;
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reinit_completion(&wvif->scan_complete);
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ret = hif_scan(wvif, req, start_idx, i - start_idx, &timeout);
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if (ret) {
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wfx_tx_unlock(wvif->wdev);
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return -EIO;
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}
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ret = wait_for_completion_timeout(&wvif->scan_complete, timeout);
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if (req->channels[start_idx]->max_power != wvif->vif->bss_conf.txpower)
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hif_set_output_power(wvif, wvif->vif->bss_conf.txpower);
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wfx_tx_unlock(wvif->wdev);
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if (!ret) {
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dev_notice(wvif->wdev->dev, "scan timeout\n");
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hif_stop_scan(wvif);
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return -ETIMEDOUT;
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}
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if (wvif->scan_abort) {
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dev_notice(wvif->wdev->dev, "scan abort\n");
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return -ECONNABORTED;
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}
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return i - start_idx;
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}
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/*
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* It is not really necessary to run scan request asynchronously. However,
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* there is a bug in "iw scan" when ieee80211_scan_completed() is called before
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* wfx_hw_scan() return
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*/
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void wfx_hw_scan_work(struct work_struct *work)
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{
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struct wfx_vif *wvif = container_of(work, struct wfx_vif, scan_work);
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struct ieee80211_scan_request *hw_req = wvif->scan_req;
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int chan_cur, ret;
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mutex_lock(&wvif->wdev->conf_mutex);
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mutex_lock(&wvif->scan_lock);
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if (wvif->join_in_progress) {
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dev_info(wvif->wdev->dev, "%s: abort in-progress REQ_JOIN",
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__func__);
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wfx_reset(wvif);
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}
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update_probe_tmpl(wvif, &hw_req->req);
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chan_cur = 0;
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do {
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ret = send_scan_req(wvif, &hw_req->req, chan_cur);
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if (ret > 0)
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chan_cur += ret;
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} while (ret > 0 && chan_cur < hw_req->req.n_channels);
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mutex_unlock(&wvif->scan_lock);
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mutex_unlock(&wvif->wdev->conf_mutex);
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__ieee80211_scan_completed_compat(wvif->wdev->hw, ret < 0);
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}
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int wfx_hw_scan(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
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struct ieee80211_scan_request *hw_req)
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{
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struct wfx_vif *wvif = (struct wfx_vif *)vif->drv_priv;
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WARN_ON(hw_req->req.n_channels > HIF_API_MAX_NB_CHANNELS);
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wvif->scan_req = hw_req;
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schedule_work(&wvif->scan_work);
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return 0;
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}
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void wfx_cancel_hw_scan(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
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{
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struct wfx_vif *wvif = (struct wfx_vif *)vif->drv_priv;
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wvif->scan_abort = true;
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hif_stop_scan(wvif);
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}
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void wfx_scan_complete(struct wfx_vif *wvif)
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{
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complete(&wvif->scan_complete);
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}
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