1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * This file is part of wl1271
4 *
5 * Copyright (C) 2008-2009 Nokia Corporation
6 *
7 * Contact: Luciano Coelho <luciano.coelho@nokia.com>
8 */
9
10#include "ps.h"
11#include "io.h"
12#include "tx.h"
13#include "debug.h"
14
15int wl1271_ps_set_mode(struct wl1271 *wl, struct wl12xx_vif *wlvif,
16		       enum wl1271_cmd_ps_mode mode)
17{
18	int ret;
19	u16 timeout = wl->conf.conn.dynamic_ps_timeout;
20
21	switch (mode) {
22	case STATION_AUTO_PS_MODE:
23	case STATION_POWER_SAVE_MODE:
24		wl1271_debug(DEBUG_PSM, "entering psm (mode=%d,timeout=%u)",
25			     mode, timeout);
26
27		ret = wl1271_acx_wake_up_conditions(wl, wlvif,
28					    wl->conf.conn.wake_up_event,
29					    wl->conf.conn.listen_interval);
30		if (ret < 0) {
31			wl1271_error("couldn't set wake up conditions");
32			return ret;
33		}
34
35		ret = wl1271_cmd_ps_mode(wl, wlvif, mode, timeout);
36		if (ret < 0)
37			return ret;
38
39		set_bit(WLVIF_FLAG_IN_PS, &wlvif->flags);
40
41		/*
42		 * enable beacon early termination.
43		 * Not relevant for 5GHz and for high rates.
44		 */
45		if ((wlvif->band == NL80211_BAND_2GHZ) &&
46		    (wlvif->basic_rate < CONF_HW_BIT_RATE_9MBPS)) {
47			ret = wl1271_acx_bet_enable(wl, wlvif, true);
48			if (ret < 0)
49				return ret;
50		}
51		break;
52	case STATION_ACTIVE_MODE:
53		wl1271_debug(DEBUG_PSM, "leaving psm");
54
55		/* disable beacon early termination */
56		if ((wlvif->band == NL80211_BAND_2GHZ) &&
57		    (wlvif->basic_rate < CONF_HW_BIT_RATE_9MBPS)) {
58			ret = wl1271_acx_bet_enable(wl, wlvif, false);
59			if (ret < 0)
60				return ret;
61		}
62
63		ret = wl1271_cmd_ps_mode(wl, wlvif, mode, 0);
64		if (ret < 0)
65			return ret;
66
67		clear_bit(WLVIF_FLAG_IN_PS, &wlvif->flags);
68		break;
69	default:
70		wl1271_warning("trying to set ps to unsupported mode %d", mode);
71		ret = -EINVAL;
72	}
73
74	return ret;
75}
76
77static void wl1271_ps_filter_frames(struct wl1271 *wl, u8 hlid)
78{
79	int i;
80	struct sk_buff *skb;
81	struct ieee80211_tx_info *info;
82	unsigned long flags;
83	int filtered[NUM_TX_QUEUES];
84	struct wl1271_link *lnk = &wl->links[hlid];
85
86	/* filter all frames currently in the low level queues for this hlid */
87	for (i = 0; i < NUM_TX_QUEUES; i++) {
88		filtered[i] = 0;
89		while ((skb = skb_dequeue(&lnk->tx_queue[i]))) {
90			filtered[i]++;
91
92			if (WARN_ON(wl12xx_is_dummy_packet(wl, skb)))
93				continue;
94
95			info = IEEE80211_SKB_CB(skb);
96			info->flags |= IEEE80211_TX_STAT_TX_FILTERED;
97			info->status.rates[0].idx = -1;
98			ieee80211_tx_status_ni(wl->hw, skb);
99		}
100	}
101
102	spin_lock_irqsave(&wl->wl_lock, flags);
103	for (i = 0; i < NUM_TX_QUEUES; i++) {
104		wl->tx_queue_count[i] -= filtered[i];
105		if (lnk->wlvif)
106			lnk->wlvif->tx_queue_count[i] -= filtered[i];
107	}
108	spin_unlock_irqrestore(&wl->wl_lock, flags);
109
110	wl1271_handle_tx_low_watermark(wl);
111}
112
113void wl12xx_ps_link_start(struct wl1271 *wl, struct wl12xx_vif *wlvif,
114			  u8 hlid, bool clean_queues)
115{
116	struct ieee80211_sta *sta;
117	struct ieee80211_vif *vif = wl12xx_wlvif_to_vif(wlvif);
118
119	if (WARN_ON_ONCE(wlvif->bss_type != BSS_TYPE_AP_BSS))
120		return;
121
122	if (!test_bit(hlid, wlvif->ap.sta_hlid_map) ||
123	    test_bit(hlid, &wl->ap_ps_map))
124		return;
125
126	wl1271_debug(DEBUG_PSM, "start mac80211 PSM on hlid %d pkts %d "
127		     "clean_queues %d", hlid, wl->links[hlid].allocated_pkts,
128		     clean_queues);
129
130	rcu_read_lock();
131	sta = ieee80211_find_sta(vif, wl->links[hlid].addr);
132	if (!sta) {
133		wl1271_error("could not find sta %pM for starting ps",
134			     wl->links[hlid].addr);
135		rcu_read_unlock();
136		return;
137	}
138
139	ieee80211_sta_ps_transition_ni(sta, true);
140	rcu_read_unlock();
141
142	/* do we want to filter all frames from this link's queues? */
143	if (clean_queues)
144		wl1271_ps_filter_frames(wl, hlid);
145
146	__set_bit(hlid, &wl->ap_ps_map);
147}
148
149void wl12xx_ps_link_end(struct wl1271 *wl, struct wl12xx_vif *wlvif, u8 hlid)
150{
151	struct ieee80211_sta *sta;
152	struct ieee80211_vif *vif = wl12xx_wlvif_to_vif(wlvif);
153
154	if (!test_bit(hlid, &wl->ap_ps_map))
155		return;
156
157	wl1271_debug(DEBUG_PSM, "end mac80211 PSM on hlid %d", hlid);
158
159	__clear_bit(hlid, &wl->ap_ps_map);
160
161	rcu_read_lock();
162	sta = ieee80211_find_sta(vif, wl->links[hlid].addr);
163	if (!sta) {
164		wl1271_error("could not find sta %pM for ending ps",
165			     wl->links[hlid].addr);
166		goto end;
167	}
168
169	ieee80211_sta_ps_transition_ni(sta, false);
170end:
171	rcu_read_unlock();
172}
173