1 // SPDX-License-Identifier: BSD-3-Clause-Clear 2 /* 3 * Copyright (C) 2024 Felix Fietkau <nbd@nbd.name> 4 */ 5 #include "mt76.h" 6 7 static void mt76_scan_complete(struct mt76_dev *dev, bool abort) 8 { 9 struct mt76_phy *phy = dev->scan.phy; 10 struct cfg80211_scan_info info = { 11 .aborted = abort, 12 }; 13 14 if (!phy) 15 return; 16 17 clear_bit(MT76_SCANNING, &phy->state); 18 19 if (dev->scan.chan && phy->main_chandef.chan && 20 !test_bit(MT76_MCU_RESET, &dev->phy.state)) 21 mt76_set_channel(phy, &phy->main_chandef, false); 22 mt76_put_vif_phy_link(phy, dev->scan.vif, dev->scan.mlink); 23 memset(&dev->scan, 0, sizeof(dev->scan)); 24 if (!test_bit(MT76_MCU_RESET, &dev->phy.state)) 25 ieee80211_scan_completed(phy->hw, &info); 26 } 27 28 void mt76_abort_scan(struct mt76_dev *dev) 29 { 30 cancel_delayed_work_sync(&dev->scan_work); 31 mt76_scan_complete(dev, true); 32 } 33 EXPORT_SYMBOL_GPL(mt76_abort_scan); 34 35 static void 36 mt76_scan_send_probe(struct mt76_dev *dev, struct cfg80211_ssid *ssid) 37 { 38 struct cfg80211_scan_request *req = dev->scan.req; 39 struct ieee80211_vif *vif = dev->scan.vif; 40 struct mt76_vif_link *mvif = dev->scan.mlink; 41 enum nl80211_band band = dev->scan.chan->band; 42 struct mt76_phy *phy = dev->scan.phy; 43 struct ieee80211_tx_info *info; 44 struct sk_buff *skb; 45 46 skb = ieee80211_probereq_get(phy->hw, vif->addr, ssid->ssid, 47 ssid->ssid_len, req->ie_len); 48 if (!skb) 49 return; 50 51 if (is_unicast_ether_addr(req->bssid)) { 52 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 53 54 ether_addr_copy(hdr->addr1, req->bssid); 55 ether_addr_copy(hdr->addr3, req->bssid); 56 } 57 58 if (req->ie_len) 59 skb_put_data(skb, req->ie, req->ie_len); 60 61 skb->priority = 7; 62 skb_set_queue_mapping(skb, IEEE80211_AC_VO); 63 64 rcu_read_lock(); 65 66 if (!ieee80211_tx_prepare_skb(phy->hw, vif, skb, band, NULL)) 67 goto out; 68 69 info = IEEE80211_SKB_CB(skb); 70 if (req->no_cck) 71 info->flags |= IEEE80211_TX_CTL_NO_CCK_RATE; 72 info->control.flags |= IEEE80211_TX_CTRL_DONT_USE_RATE_MASK; 73 74 mt76_tx(phy, NULL, mvif->wcid, skb); 75 76 out: 77 rcu_read_unlock(); 78 } 79 80 void mt76_scan_work(struct work_struct *work) 81 { 82 struct mt76_dev *dev = container_of(work, struct mt76_dev, 83 scan_work.work); 84 struct cfg80211_scan_request *req = dev->scan.req; 85 struct cfg80211_chan_def chandef = {}; 86 struct mt76_phy *phy = dev->scan.phy; 87 int duration = HZ / 9; /* ~110 ms */ 88 int i; 89 90 if (dev->scan.chan_idx >= req->n_channels) { 91 mt76_scan_complete(dev, false); 92 return; 93 } 94 95 if (dev->scan.chan && phy->num_sta) { 96 dev->scan.chan = NULL; 97 mt76_set_channel(phy, &phy->main_chandef, false); 98 goto out; 99 } 100 101 dev->scan.chan = req->channels[dev->scan.chan_idx++]; 102 cfg80211_chandef_create(&chandef, dev->scan.chan, NL80211_CHAN_HT20); 103 mt76_set_channel(phy, &chandef, true); 104 105 if (!req->n_ssids || 106 chandef.chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR)) 107 goto out; 108 109 duration = HZ / 16; /* ~60 ms */ 110 local_bh_disable(); 111 for (i = 0; i < req->n_ssids; i++) 112 mt76_scan_send_probe(dev, &req->ssids[i]); 113 local_bh_enable(); 114 115 out: 116 if (dev->scan.chan) 117 duration = max_t(int, duration, 118 msecs_to_jiffies(req->duration + 119 (req->duration >> 5))); 120 121 ieee80211_queue_delayed_work(dev->phy.hw, &dev->scan_work, duration); 122 } 123 124 int mt76_hw_scan(struct ieee80211_hw *hw, struct ieee80211_vif *vif, 125 struct ieee80211_scan_request *req) 126 { 127 struct mt76_phy *phy = hw->priv; 128 struct mt76_dev *dev = phy->dev; 129 struct mt76_vif_link *mlink; 130 int ret = 0; 131 132 if (hw->wiphy->n_radio > 1) { 133 phy = dev->band_phys[req->req.channels[0]->band]; 134 if (!phy) 135 return -EINVAL; 136 } 137 138 mutex_lock(&dev->mutex); 139 140 if (dev->scan.req || phy->roc_vif || 141 test_bit(MT76_MCU_RESET, &dev->phy.state)) { 142 ret = -EBUSY; 143 goto out; 144 } 145 146 mlink = mt76_get_vif_phy_link(phy, vif); 147 if (IS_ERR(mlink)) { 148 ret = PTR_ERR(mlink); 149 goto out; 150 } 151 152 memset(&dev->scan, 0, sizeof(dev->scan)); 153 dev->scan.req = &req->req; 154 dev->scan.vif = vif; 155 dev->scan.phy = phy; 156 dev->scan.mlink = mlink; 157 ieee80211_queue_delayed_work(dev->phy.hw, &dev->scan_work, 0); 158 159 out: 160 mutex_unlock(&dev->mutex); 161 162 return ret; 163 } 164 EXPORT_SYMBOL_GPL(mt76_hw_scan); 165 166 void mt76_cancel_hw_scan(struct ieee80211_hw *hw, struct ieee80211_vif *vif) 167 { 168 struct mt76_phy *phy = hw->priv; 169 170 mt76_abort_scan(phy->dev); 171 } 172 EXPORT_SYMBOL_GPL(mt76_cancel_hw_scan); 173