1 /*
2 * Copyright (C) 2016 Felix Fietkau <nbd@nbd.name>
3 *
4 * Permission to use, copy, modify, and/or distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
7 *
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15 */
16
17 #include "mt76x2.h"
18 #include "mt76x2_dma.h"
19
20 struct beacon_bc_data {
21 struct mt76x2_dev *dev;
22 struct sk_buff_head q;
23 struct sk_buff *tail[8];
24 };
25
mt76x2_tx_prepare_skb(struct mt76_dev * mdev,void * txwi,struct sk_buff * skb,struct mt76_queue * q,struct mt76_wcid * wcid,struct ieee80211_sta * sta,u32 * tx_info)26 int mt76x2_tx_prepare_skb(struct mt76_dev *mdev, void *txwi,
27 struct sk_buff *skb, struct mt76_queue *q,
28 struct mt76_wcid *wcid, struct ieee80211_sta *sta,
29 u32 *tx_info)
30 {
31 struct mt76x2_dev *dev = container_of(mdev, struct mt76x2_dev, mt76);
32 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
33 int qsel = MT_QSEL_EDCA;
34 int ret;
35
36 if (q == &dev->mt76.q_tx[MT_TXQ_PSD] && wcid && wcid->idx < 128)
37 mt76x2_mac_wcid_set_drop(dev, wcid->idx, false);
38
39 mt76x2_mac_write_txwi(dev, txwi, skb, wcid, sta, skb->len);
40
41 ret = mt76x2_insert_hdr_pad(skb);
42 if (ret < 0)
43 return ret;
44
45 if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE)
46 qsel = MT_QSEL_MGMT;
47
48 *tx_info = FIELD_PREP(MT_TXD_INFO_QSEL, qsel) |
49 MT_TXD_INFO_80211;
50
51 if (!wcid || wcid->hw_key_idx == 0xff || wcid->sw_iv)
52 *tx_info |= MT_TXD_INFO_WIV;
53
54 return 0;
55 }
56
57 static void
mt76x2_update_beacon_iter(void * priv,u8 * mac,struct ieee80211_vif * vif)58 mt76x2_update_beacon_iter(void *priv, u8 *mac, struct ieee80211_vif *vif)
59 {
60 struct mt76x2_dev *dev = (struct mt76x2_dev *) priv;
61 struct mt76x2_vif *mvif = (struct mt76x2_vif *) vif->drv_priv;
62 struct sk_buff *skb = NULL;
63
64 if (!(dev->beacon_mask & BIT(mvif->idx)))
65 return;
66
67 skb = ieee80211_beacon_get(mt76_hw(dev), vif);
68 if (!skb)
69 return;
70
71 mt76x2_mac_set_beacon(dev, mvif->idx, skb);
72 }
73
74 static void
mt76x2_add_buffered_bc(void * priv,u8 * mac,struct ieee80211_vif * vif)75 mt76x2_add_buffered_bc(void *priv, u8 *mac, struct ieee80211_vif *vif)
76 {
77 struct beacon_bc_data *data = priv;
78 struct mt76x2_dev *dev = data->dev;
79 struct mt76x2_vif *mvif = (struct mt76x2_vif *) vif->drv_priv;
80 struct ieee80211_tx_info *info;
81 struct sk_buff *skb;
82
83 if (!(dev->beacon_mask & BIT(mvif->idx)))
84 return;
85
86 skb = ieee80211_get_buffered_bc(mt76_hw(dev), vif);
87 if (!skb)
88 return;
89
90 info = IEEE80211_SKB_CB(skb);
91 info->control.vif = vif;
92 info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
93 mt76_skb_set_moredata(skb, true);
94 __skb_queue_tail(&data->q, skb);
95 data->tail[mvif->idx] = skb;
96 }
97
98 static void
mt76x2_resync_beacon_timer(struct mt76x2_dev * dev)99 mt76x2_resync_beacon_timer(struct mt76x2_dev *dev)
100 {
101 u32 timer_val = dev->beacon_int << 4;
102
103 dev->tbtt_count++;
104
105 /*
106 * Beacon timer drifts by 1us every tick, the timer is configured
107 * in 1/16 TU (64us) units.
108 */
109 if (dev->tbtt_count < 62)
110 return;
111
112 if (dev->tbtt_count >= 64) {
113 dev->tbtt_count = 0;
114 return;
115 }
116
117 /*
118 * The updated beacon interval takes effect after two TBTT, because
119 * at this point the original interval has already been loaded into
120 * the next TBTT_TIMER value
121 */
122 if (dev->tbtt_count == 62)
123 timer_val -= 1;
124
125 mt76_rmw_field(dev, MT_BEACON_TIME_CFG,
126 MT_BEACON_TIME_CFG_INTVAL, timer_val);
127 }
128
mt76x2_pre_tbtt_tasklet(unsigned long arg)129 void mt76x2_pre_tbtt_tasklet(unsigned long arg)
130 {
131 struct mt76x2_dev *dev = (struct mt76x2_dev *) arg;
132 struct mt76_queue *q = &dev->mt76.q_tx[MT_TXQ_PSD];
133 struct beacon_bc_data data = {};
134 struct sk_buff *skb;
135 int i, nframes;
136
137 mt76x2_resync_beacon_timer(dev);
138
139 data.dev = dev;
140 __skb_queue_head_init(&data.q);
141
142 ieee80211_iterate_active_interfaces_atomic(mt76_hw(dev),
143 IEEE80211_IFACE_ITER_RESUME_ALL,
144 mt76x2_update_beacon_iter, dev);
145
146 do {
147 nframes = skb_queue_len(&data.q);
148 ieee80211_iterate_active_interfaces_atomic(mt76_hw(dev),
149 IEEE80211_IFACE_ITER_RESUME_ALL,
150 mt76x2_add_buffered_bc, &data);
151 } while (nframes != skb_queue_len(&data.q));
152
153 if (!nframes)
154 return;
155
156 for (i = 0; i < ARRAY_SIZE(data.tail); i++) {
157 if (!data.tail[i])
158 continue;
159
160 mt76_skb_set_moredata(data.tail[i], false);
161 }
162
163 spin_lock_bh(&q->lock);
164 while ((skb = __skb_dequeue(&data.q)) != NULL) {
165 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
166 struct ieee80211_vif *vif = info->control.vif;
167 struct mt76x2_vif *mvif = (struct mt76x2_vif *) vif->drv_priv;
168
169 mt76_dma_tx_queue_skb(&dev->mt76, q, skb, &mvif->group_wcid,
170 NULL);
171 }
172 spin_unlock_bh(&q->lock);
173 }
174
175
