1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Scan related functions.
4 *
5 * Copyright (c) 2017-2020, 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
wfx_ieee80211_scan_completed_compat(struct ieee80211_hw * hw,bool aborted)15 static void wfx_ieee80211_scan_completed_compat(struct ieee80211_hw *hw, bool aborted)
16 {
17 struct cfg80211_scan_info info = {
18 .aborted = aborted,
19 };
20
21 ieee80211_scan_completed(hw, &info);
22 }
23
update_probe_tmpl(struct wfx_vif * wvif,struct cfg80211_scan_request * req)24 static int update_probe_tmpl(struct wfx_vif *wvif, struct cfg80211_scan_request *req)
25 {
26 struct ieee80211_vif *vif = wvif_to_vif(wvif);
27 struct sk_buff *skb;
28
29 skb = ieee80211_probereq_get(wvif->wdev->hw, vif->addr, NULL, 0,
30 req->ie_len);
31 if (!skb)
32 return -ENOMEM;
33
34 skb_put_data(skb, req->ie, req->ie_len);
35 wfx_hif_set_template_frame(wvif, skb, HIF_TMPLT_PRBREQ, 0);
36 dev_kfree_skb(skb);
37 return 0;
38 }
39
send_scan_req(struct wfx_vif * wvif,struct cfg80211_scan_request * req,int start_idx)40 static int send_scan_req(struct wfx_vif *wvif, struct cfg80211_scan_request *req, int start_idx)
41 {
42 struct ieee80211_vif *vif = wvif_to_vif(wvif);
43 struct ieee80211_channel *ch_start, *ch_cur;
44 int i, ret;
45
46 for (i = start_idx; i < req->n_channels; i++) {
47 ch_start = req->channels[start_idx];
48 ch_cur = req->channels[i];
49 WARN(ch_cur->band != NL80211_BAND_2GHZ, "band not supported");
50 if (ch_cur->max_power != ch_start->max_power)
51 break;
52 if ((ch_cur->flags ^ ch_start->flags) & IEEE80211_CHAN_NO_IR)
53 break;
54 }
55 wfx_tx_lock_flush(wvif->wdev);
56 wvif->scan_abort = false;
57 reinit_completion(&wvif->scan_complete);
58 ret = wfx_hif_scan(wvif, req, start_idx, i - start_idx);
59 if (ret) {
60 wfx_tx_unlock(wvif->wdev);
61 return -EIO;
62 }
63 ret = wait_for_completion_timeout(&wvif->scan_complete, 1 * HZ);
64 if (!ret) {
65 wfx_hif_stop_scan(wvif);
66 ret = wait_for_completion_timeout(&wvif->scan_complete, 1 * HZ);
67 dev_dbg(wvif->wdev->dev, "scan timeout (%d channels done)\n",
68 wvif->scan_nb_chan_done);
69 }
70 if (!ret) {
71 dev_err(wvif->wdev->dev, "scan didn't stop\n");
72 ret = -ETIMEDOUT;
73 } else if (wvif->scan_abort) {
74 dev_notice(wvif->wdev->dev, "scan abort\n");
75 ret = -ECONNABORTED;
76 } else if (wvif->scan_nb_chan_done > i - start_idx) {
77 ret = -EIO;
78 } else {
79 ret = wvif->scan_nb_chan_done;
80 }
81 if (req->channels[start_idx]->max_power != vif->bss_conf.txpower)
82 wfx_hif_set_output_power(wvif, vif->bss_conf.txpower);
83 wfx_tx_unlock(wvif->wdev);
84 return ret;
85 }
86
87 /* It is not really necessary to run scan request asynchronously. However,
88 * there is a bug in "iw scan" when ieee80211_scan_completed() is called before
89 * wfx_hw_scan() return
90 */
wfx_hw_scan_work(struct work_struct * work)91 void wfx_hw_scan_work(struct work_struct *work)
92 {
93 struct wfx_vif *wvif = container_of(work, struct wfx_vif, scan_work);
94 struct ieee80211_scan_request *hw_req = wvif->scan_req;
95 int chan_cur, ret, err;
96
97 mutex_lock(&wvif->wdev->conf_mutex);
98 mutex_lock(&wvif->scan_lock);
99 if (wvif->join_in_progress) {
100 dev_info(wvif->wdev->dev, "abort in-progress REQ_JOIN");
101 wfx_reset(wvif);
102 }
103 update_probe_tmpl(wvif, &hw_req->req);
104 chan_cur = 0;
105 err = 0;
106 do {
107 ret = send_scan_req(wvif, &hw_req->req, chan_cur);
108 if (ret > 0) {
109 chan_cur += ret;
110 err = 0;
111 }
112 if (!ret)
113 err++;
114 if (err > 2) {
115 dev_err(wvif->wdev->dev, "scan has not been able to start\n");
116 ret = -ETIMEDOUT;
117 }
118 } while (ret >= 0 && chan_cur < hw_req->req.n_channels);
119 mutex_unlock(&wvif->scan_lock);
120 mutex_unlock(&wvif->wdev->conf_mutex);
121 wfx_ieee80211_scan_completed_compat(wvif->wdev->hw, ret < 0);
122 }
123
wfx_hw_scan(struct ieee80211_hw * hw,struct ieee80211_vif * vif,struct ieee80211_scan_request * hw_req)124 int wfx_hw_scan(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
125 struct ieee80211_scan_request *hw_req)
126 {
127 struct wfx_vif *wvif = (struct wfx_vif *)vif->drv_priv;
128
129 WARN_ON(hw_req->req.n_channels > HIF_API_MAX_NB_CHANNELS);
130 wvif->scan_req = hw_req;
131 schedule_work(&wvif->scan_work);
132 return 0;
133 }
134
wfx_cancel_hw_scan(struct ieee80211_hw * hw,struct ieee80211_vif * vif)135 void wfx_cancel_hw_scan(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
136 {
137 struct wfx_vif *wvif = (struct wfx_vif *)vif->drv_priv;
138
139 wvif->scan_abort = true;
140 wfx_hif_stop_scan(wvif);
141 }
142
wfx_scan_complete(struct wfx_vif * wvif,int nb_chan_done)143 void wfx_scan_complete(struct wfx_vif *wvif, int nb_chan_done)
144 {
145 wvif->scan_nb_chan_done = nb_chan_done;
146 complete(&wvif->scan_complete);
147 }
148