Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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linux
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Scan related functions.
4 *
5 * Copyright (c) 2017-2019, Silicon Laboratories, Inc.
6 * Copyright (c) 2010, ST-Ericsson
7 */
8#include <net/mac80211.h>
9
10#include "scan.h"
11#include "wfx.h"
12#include "sta.h"
13#include "hif_tx_mib.h"
14
15static void __ieee80211_scan_completed_compat(struct ieee80211_hw *hw,
16 bool aborted)
17{
18 struct cfg80211_scan_info info = {
19 .aborted = aborted,
20 };
21
22 ieee80211_scan_completed(hw, &info);
23}
24
25static int update_probe_tmpl(struct wfx_vif *wvif,
26 struct cfg80211_scan_request *req)
27{
28 struct sk_buff *skb;
29
30 skb = ieee80211_probereq_get(wvif->wdev->hw, wvif->vif->addr,
31 NULL, 0, req->ie_len);
32 if (!skb)
33 return -ENOMEM;
34
35 skb_put_data(skb, req->ie, req->ie_len);
36 hif_set_template_frame(wvif, skb, HIF_TMPLT_PRBREQ, 0);
37 dev_kfree_skb(skb);
38 return 0;
39}
40
41static int send_scan_req(struct wfx_vif *wvif,
42 struct cfg80211_scan_request *req, int start_idx)
43{
44 int i, ret, timeout;
45 struct ieee80211_channel *ch_start, *ch_cur;
46
47 for (i = start_idx; i < req->n_channels; i++) {
48 ch_start = req->channels[start_idx];
49 ch_cur = req->channels[i];
50 WARN(ch_cur->band != NL80211_BAND_2GHZ, "band not supported");
51 if (ch_cur->max_power != ch_start->max_power)
52 break;
53 if ((ch_cur->flags ^ ch_start->flags) & IEEE80211_CHAN_NO_IR)
54 break;
55 }
56 wfx_tx_lock_flush(wvif->wdev);
57 wvif->scan_abort = false;
58 reinit_completion(&wvif->scan_complete);
59 timeout = hif_scan(wvif, req, start_idx, i - start_idx);
60 if (timeout < 0) {
61 wfx_tx_unlock(wvif->wdev);
62 return timeout;
63 }
64 ret = wait_for_completion_timeout(&wvif->scan_complete, timeout);
65 if (req->channels[start_idx]->max_power != wvif->vif->bss_conf.txpower)
66 hif_set_output_power(wvif, wvif->vif->bss_conf.txpower);
67 wfx_tx_unlock(wvif->wdev);
68 if (!ret) {
69 dev_notice(wvif->wdev->dev, "scan timeout\n");
70 hif_stop_scan(wvif);
71 return -ETIMEDOUT;
72 }
73 if (wvif->scan_abort) {
74 dev_notice(wvif->wdev->dev, "scan abort\n");
75 return -ECONNABORTED;
76 }
77 return i - start_idx;
78}
79
80/*
81 * It is not really necessary to run scan request asynchronously. However,
82 * there is a bug in "iw scan" when ieee80211_scan_completed() is called before
83 * wfx_hw_scan() return
84 */
85void wfx_hw_scan_work(struct work_struct *work)
86{
87 struct wfx_vif *wvif = container_of(work, struct wfx_vif, scan_work);
88 struct ieee80211_scan_request *hw_req = wvif->scan_req;
89 int chan_cur, ret;
90
91 mutex_lock(&wvif->scan_lock);
92 mutex_lock(&wvif->wdev->conf_mutex);
93 update_probe_tmpl(wvif, &hw_req->req);
94 wfx_fwd_probe_req(wvif, true);
95 chan_cur = 0;
96 do {
97 ret = send_scan_req(wvif, &hw_req->req, chan_cur);
98 if (ret > 0)
99 chan_cur += ret;
100 } while (ret > 0 && chan_cur < hw_req->req.n_channels);
101 mutex_unlock(&wvif->wdev->conf_mutex);
102 mutex_unlock(&wvif->scan_lock);
103 __ieee80211_scan_completed_compat(wvif->wdev->hw, ret < 0);
104}
105
106int wfx_hw_scan(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
107 struct ieee80211_scan_request *hw_req)
108{
109 struct wfx_vif *wvif = (struct wfx_vif *)vif->drv_priv;
110
111 WARN_ON(hw_req->req.n_channels > HIF_API_MAX_NB_CHANNELS);
112
113 if (vif->type == NL80211_IFTYPE_AP)
114 return -EOPNOTSUPP;
115
116 if (wvif->state == WFX_STATE_PRE_STA)
117 return -EBUSY;
118
119 wvif->scan_req = hw_req;
120 schedule_work(&wvif->scan_work);
121 return 0;
122}
123
124void wfx_cancel_hw_scan(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
125{
126 struct wfx_vif *wvif = (struct wfx_vif *)vif->drv_priv;
127
128 wvif->scan_abort = true;
129 hif_stop_scan(wvif);
130}
131
132void wfx_scan_complete(struct wfx_vif *wvif)
133{
134 complete(&wvif->scan_complete);
135}