2 * Copyright (C) 2014 Felix Fietkau <nbd@openwrt.org>
3 * Copyright (C) 2015 Jakub Kicinski <kubakici@wp.pl>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2
7 * as published by the Free Software Foundation
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
19 MT_TXQ_VO
= IEEE80211_AC_VO
,
20 MT_TXQ_VI
= IEEE80211_AC_VI
,
21 MT_TXQ_BE
= IEEE80211_AC_BE
,
22 MT_TXQ_BK
= IEEE80211_AC_BK
,
28 /* Hardware uses mirrored order of queues with Q0 having the highest priority */
34 /* Take mac80211 Q id from the skb and translate it to hardware Q id */
35 static u8
skb2q(struct sk_buff
*skb
)
37 int qid
= skb_get_queue_mapping(skb
);
39 if (WARN_ON(qid
>= MT_TXQ_PSD
)) {
41 skb_set_queue_mapping(skb
, qid
);
47 /* Note: TX retry reporting is a bit broken.
48 * Retries are reported only once per AMPDU and often come a frame early
49 * i.e. they are reported in the last status preceding the AMPDU. Apart
50 * from the fact that it's hard to know the length of the AMPDU (which is
51 * required to know to how many consecutive frames retries should be
52 * applied), if status comes early on full FIFO it gets lost and retries
53 * of the whole AMPDU become invisible.
54 * As a work-around encode the desired rate in PKT_ID of TX descriptor
55 * and based on that guess the retries (every rate is tried once).
56 * Only downside here is that for MCS0 we have to rely solely on
57 * transmission failures as no retries can ever be reported.
58 * Not having to read EXT_FIFO has a nice effect of doubling the number
59 * of reports which can be fetched.
60 * Also the vendor driver never uses the EXT_FIFO register so it may be
63 static u8
mt7601u_tx_pktid_enc(struct mt7601u_dev
*dev
, u8 rate
, bool is_probe
)
65 u8 encoded
= (rate
+ 1) + is_probe
* 8;
67 /* Because PKT_ID 0 disables status reporting only 15 values are
68 * available but 16 are needed (8 MCS * 2 for encoding is_probe)
69 * - we need to cram together two rates. MCS0 and MCS7 with is_probe
72 if (is_probe
&& rate
== 7)
79 mt7601u_tx_pktid_dec(struct mt7601u_dev
*dev
, struct mt76_tx_status
*stat
)
81 u8 req_rate
= stat
->pktid
;
82 u8 eff_rate
= stat
->rate
& 0x7;
87 stat
->is_probe
= true;
90 /* Decide between MCS0 and MCS7 which share pktid 9 */
91 if (!req_rate
&& eff_rate
)
95 stat
->retry
= req_rate
- eff_rate
;
98 static void mt7601u_tx_skb_remove_dma_overhead(struct sk_buff
*skb
,
99 struct ieee80211_tx_info
*info
)
101 int pkt_len
= (unsigned long)info
->status
.status_driver_data
[0];
103 skb_pull(skb
, sizeof(struct mt76_txwi
) + 4);
104 if (ieee80211_get_hdrlen_from_skb(skb
) % 4)
105 mt76_remove_hdr_pad(skb
);
107 skb_trim(skb
, pkt_len
);
110 void mt7601u_tx_status(struct mt7601u_dev
*dev
, struct sk_buff
*skb
)
112 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
114 mt7601u_tx_skb_remove_dma_overhead(skb
, info
);
116 ieee80211_tx_info_clear_status(info
);
117 info
->status
.rates
[0].idx
= -1;
118 info
->flags
|= IEEE80211_TX_STAT_ACK
;
119 ieee80211_tx_status(dev
->hw
, skb
);
122 static int mt7601u_skb_rooms(struct mt7601u_dev
*dev
, struct sk_buff
*skb
)
124 int hdr_len
= ieee80211_get_hdrlen_from_skb(skb
);
127 need_head
= sizeof(struct mt76_txwi
) + 4;
131 return skb_cow(skb
, need_head
);
134 static struct mt76_txwi
*
135 mt7601u_push_txwi(struct mt7601u_dev
*dev
, struct sk_buff
*skb
,
136 struct ieee80211_sta
*sta
, struct mt76_wcid
*wcid
,
139 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
140 struct ieee80211_tx_rate
*rate
= &info
->control
.rates
[0];
141 struct mt76_txwi
*txwi
;
148 txwi
= (struct mt76_txwi
*)skb_push(skb
, sizeof(struct mt76_txwi
));
149 memset(txwi
, 0, sizeof(*txwi
));
151 if (!wcid
->tx_rate_set
)
152 ieee80211_get_tx_rates(info
->control
.vif
, sta
, skb
,
153 info
->control
.rates
, 1);
155 spin_lock_irqsave(&dev
->lock
, flags
);
156 if (rate
->idx
< 0 || !rate
->count
)
157 rate_ctl
= wcid
->tx_rate
;
159 rate_ctl
= mt76_mac_tx_rate_val(dev
, rate
, &nss
);
160 spin_unlock_irqrestore(&dev
->lock
, flags
);
161 txwi
->rate_ctl
= cpu_to_le16(rate_ctl
);
163 if (!(info
->flags
& IEEE80211_TX_CTL_NO_ACK
))
164 txwi
->ack_ctl
|= MT_TXWI_ACK_CTL_REQ
;
165 if (info
->flags
& IEEE80211_TX_CTL_ASSIGN_SEQ
)
166 txwi
->ack_ctl
|= MT_TXWI_ACK_CTL_NSEQ
;
168 if ((info
->flags
& IEEE80211_TX_CTL_AMPDU
) && sta
) {
169 u8 ba_size
= IEEE80211_MIN_AMPDU_BUF
;
171 ba_size
<<= sta
->ht_cap
.ampdu_factor
;
172 ba_size
= min_t(int, 63, ba_size
);
173 if (info
->flags
& IEEE80211_TX_CTL_RATE_CTRL_PROBE
)
175 txwi
->ack_ctl
|= MT76_SET(MT_TXWI_ACK_CTL_BA_WINDOW
, ba_size
);
177 txwi
->flags
= cpu_to_le16(MT_TXWI_FLAGS_AMPDU
|
178 MT76_SET(MT_TXWI_FLAGS_MPDU_DENSITY
,
179 sta
->ht_cap
.ampdu_density
));
180 if (info
->flags
& IEEE80211_TX_CTL_RATE_CTRL_PROBE
)
184 txwi
->wcid
= wcid
->idx
;
186 is_probe
= !!(info
->flags
& IEEE80211_TX_CTL_RATE_CTRL_PROBE
);
187 pkt_id
= mt7601u_tx_pktid_enc(dev
, rate_ctl
& 0x7, is_probe
);
188 pkt_len
|= MT76_SET(MT_TXWI_LEN_PKTID
, pkt_id
);
189 txwi
->len_ctl
= cpu_to_le16(pkt_len
);
194 void mt7601u_tx(struct ieee80211_hw
*hw
, struct ieee80211_tx_control
*control
,
197 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
198 struct mt7601u_dev
*dev
= hw
->priv
;
199 struct ieee80211_vif
*vif
= info
->control
.vif
;
200 struct ieee80211_sta
*sta
= control
->sta
;
201 struct mt76_sta
*msta
= NULL
;
202 struct mt76_wcid
*wcid
= dev
->mon_wcid
;
203 struct mt76_txwi
*txwi
;
204 int pkt_len
= skb
->len
;
205 int hw_q
= skb2q(skb
);
207 BUILD_BUG_ON(ARRAY_SIZE(info
->status
.status_driver_data
) < 1);
208 info
->status
.status_driver_data
[0] = (void *)(unsigned long)pkt_len
;
210 if (mt7601u_skb_rooms(dev
, skb
) || mt76_insert_hdr_pad(skb
)) {
211 ieee80211_free_txskb(dev
->hw
, skb
);
216 msta
= (struct mt76_sta
*) sta
->drv_priv
;
219 struct mt76_vif
*mvif
= (struct mt76_vif
*)vif
->drv_priv
;
221 wcid
= &mvif
->group_wcid
;
224 txwi
= mt7601u_push_txwi(dev
, skb
, sta
, wcid
, pkt_len
);
226 if (mt7601u_dma_enqueue_tx(dev
, skb
, wcid
, hw_q
))
229 trace_mt_tx(dev
, skb
, msta
, txwi
);
232 void mt7601u_tx_stat(struct work_struct
*work
)
234 struct mt7601u_dev
*dev
= container_of(work
, struct mt7601u_dev
,
236 struct mt76_tx_status stat
;
240 while (!test_bit(MT7601U_STATE_REMOVED
, &dev
->state
)) {
241 stat
= mt7601u_mac_fetch_tx_status(dev
);
245 mt7601u_tx_pktid_dec(dev
, &stat
);
246 mt76_send_tx_status(dev
, &stat
);
250 trace_mt_tx_status_cleaned(dev
, cleaned
);
252 spin_lock_irqsave(&dev
->tx_lock
, flags
);
254 queue_delayed_work(dev
->stat_wq
, &dev
->stat_work
,
255 msecs_to_jiffies(10));
256 else if (test_and_clear_bit(MT7601U_STATE_MORE_STATS
, &dev
->state
))
257 queue_delayed_work(dev
->stat_wq
, &dev
->stat_work
,
258 msecs_to_jiffies(20));
260 clear_bit(MT7601U_STATE_READING_STATS
, &dev
->state
);
261 spin_unlock_irqrestore(&dev
->tx_lock
, flags
);
264 int mt7601u_conf_tx(struct ieee80211_hw
*hw
, struct ieee80211_vif
*vif
,
265 u16 queue
, const struct ieee80211_tx_queue_params
*params
)
267 struct mt7601u_dev
*dev
= hw
->priv
;
268 u8 cw_min
= 5, cw_max
= 10, hw_q
= q2hwq(queue
);
271 /* TODO: should we do funny things with the parameters?
272 * See what mt7601u_set_default_edca() used to do in init.c.
276 cw_min
= fls(params
->cw_min
);
278 cw_max
= fls(params
->cw_max
);
280 WARN_ON(params
->txop
> 0xff);
281 WARN_ON(params
->aifs
> 0xf);
282 WARN_ON(cw_min
> 0xf);
283 WARN_ON(cw_max
> 0xf);
285 val
= MT76_SET(MT_EDCA_CFG_AIFSN
, params
->aifs
) |
286 MT76_SET(MT_EDCA_CFG_CWMIN
, cw_min
) |
287 MT76_SET(MT_EDCA_CFG_CWMAX
, cw_max
);
288 /* TODO: based on user-controlled EnableTxBurst var vendor drv sets
289 * a really long txop on AC0 (see connect.c:2009) but only on
290 * connect? When not connected should be 0.
295 val
|= MT76_SET(MT_EDCA_CFG_TXOP
, params
->txop
);
296 mt76_wr(dev
, MT_EDCA_CFG_AC(hw_q
), val
);
298 val
= mt76_rr(dev
, MT_WMM_TXOP(hw_q
));
299 val
&= ~(MT_WMM_TXOP_MASK
<< MT_WMM_TXOP_SHIFT(hw_q
));
300 val
|= params
->txop
<< MT_WMM_TXOP_SHIFT(hw_q
);
301 mt76_wr(dev
, MT_WMM_TXOP(hw_q
), val
);
303 val
= mt76_rr(dev
, MT_WMM_AIFSN
);
304 val
&= ~(MT_WMM_AIFSN_MASK
<< MT_WMM_AIFSN_SHIFT(hw_q
));
305 val
|= params
->aifs
<< MT_WMM_AIFSN_SHIFT(hw_q
);
306 mt76_wr(dev
, MT_WMM_AIFSN
, val
);
308 val
= mt76_rr(dev
, MT_WMM_CWMIN
);
309 val
&= ~(MT_WMM_CWMIN_MASK
<< MT_WMM_CWMIN_SHIFT(hw_q
));
310 val
|= cw_min
<< MT_WMM_CWMIN_SHIFT(hw_q
);
311 mt76_wr(dev
, MT_WMM_CWMIN
, val
);
313 val
= mt76_rr(dev
, MT_WMM_CWMAX
);
314 val
&= ~(MT_WMM_CWMAX_MASK
<< MT_WMM_CWMAX_SHIFT(hw_q
));
315 val
|= cw_max
<< MT_WMM_CWMAX_SHIFT(hw_q
);
316 mt76_wr(dev
, MT_WMM_CWMAX
, val
);