1 // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
2 /*
3  * Copyright (C) 2013-2014, 2018-2019, 2022-2023 Intel Corporation
4  * Copyright (C) 2013-2014 Intel Mobile Communications GmbH
5  */
6 #include "mvm.h"
7 
8 /* For counting bound interfaces */
9 struct iwl_mvm_active_iface_iterator_data {
10 	struct ieee80211_vif *ignore_vif;
11 	struct ieee80211_sta *sta_vif_ap_sta;
12 	enum iwl_sf_state sta_vif_state;
13 	u32 num_active_macs;
14 };
15 
16 /*
17  * Count bound interfaces which are not p2p, besides data->ignore_vif.
18  * data->station_vif will point to one bound vif of type station, if exists.
19  */
20 static void iwl_mvm_bound_iface_iterator(void *_data, u8 *mac,
21 					 struct ieee80211_vif *vif)
22 {
23 	struct iwl_mvm_active_iface_iterator_data *data = _data;
24 	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
25 
26 	if (vif == data->ignore_vif || !mvmvif->deflink.phy_ctxt ||
27 	    vif->type == NL80211_IFTYPE_P2P_DEVICE)
28 		return;
29 
30 	data->num_active_macs++;
31 
32 	if (vif->type == NL80211_IFTYPE_STATION) {
33 		data->sta_vif_ap_sta = mvmvif->ap_sta;
34 		if (vif->cfg.assoc)
35 			data->sta_vif_state = SF_FULL_ON;
36 		else
37 			data->sta_vif_state = SF_INIT_OFF;
38 	}
39 }
40 
41 /*
42  * Aging and idle timeouts for the different possible scenarios
43  * in default configuration
44  */
45 static const
46 __le32 sf_full_timeout_def[SF_NUM_SCENARIO][SF_NUM_TIMEOUT_TYPES] = {
47 	{
48 		cpu_to_le32(SF_SINGLE_UNICAST_AGING_TIMER_DEF),
49 		cpu_to_le32(SF_SINGLE_UNICAST_IDLE_TIMER_DEF)
50 	},
51 	{
52 		cpu_to_le32(SF_AGG_UNICAST_AGING_TIMER_DEF),
53 		cpu_to_le32(SF_AGG_UNICAST_IDLE_TIMER_DEF)
54 	},
55 	{
56 		cpu_to_le32(SF_MCAST_AGING_TIMER_DEF),
57 		cpu_to_le32(SF_MCAST_IDLE_TIMER_DEF)
58 	},
59 	{
60 		cpu_to_le32(SF_BA_AGING_TIMER_DEF),
61 		cpu_to_le32(SF_BA_IDLE_TIMER_DEF)
62 	},
63 	{
64 		cpu_to_le32(SF_TX_RE_AGING_TIMER_DEF),
65 		cpu_to_le32(SF_TX_RE_IDLE_TIMER_DEF)
66 	},
67 };
68 
69 /*
70  * Aging and idle timeouts for the different possible scenarios
71  * in single BSS MAC configuration.
72  */
73 static const __le32 sf_full_timeout[SF_NUM_SCENARIO][SF_NUM_TIMEOUT_TYPES] = {
74 	{
75 		cpu_to_le32(SF_SINGLE_UNICAST_AGING_TIMER),
76 		cpu_to_le32(SF_SINGLE_UNICAST_IDLE_TIMER)
77 	},
78 	{
79 		cpu_to_le32(SF_AGG_UNICAST_AGING_TIMER),
80 		cpu_to_le32(SF_AGG_UNICAST_IDLE_TIMER)
81 	},
82 	{
83 		cpu_to_le32(SF_MCAST_AGING_TIMER),
84 		cpu_to_le32(SF_MCAST_IDLE_TIMER)
85 	},
86 	{
87 		cpu_to_le32(SF_BA_AGING_TIMER),
88 		cpu_to_le32(SF_BA_IDLE_TIMER)
89 	},
90 	{
91 		cpu_to_le32(SF_TX_RE_AGING_TIMER),
92 		cpu_to_le32(SF_TX_RE_IDLE_TIMER)
93 	},
94 };
95 
96 static void iwl_mvm_fill_sf_command(struct iwl_mvm *mvm,
97 				    struct iwl_sf_cfg_cmd *sf_cmd,
98 				    struct ieee80211_sta *sta)
99 {
100 	int i, j, watermark;
101 	u8 max_rx_nss = 0;
102 	bool is_legacy = true;
103 	struct ieee80211_link_sta *link_sta;
104 	unsigned int link_id;
105 
106 	sf_cmd->watermark[SF_LONG_DELAY_ON] = cpu_to_le32(SF_W_MARK_SCAN);
107 
108 	/*
109 	 * If we are in association flow - check antenna configuration
110 	 * capabilities of the AP station, and choose the watermark accordingly.
111 	 */
112 	if (sta) {
113 		/* find the maximal NSS number among all links (if relevant) */
114 		rcu_read_lock();
115 		for (link_id = 0; link_id < ARRAY_SIZE(sta->link); link_id++) {
116 			link_sta = rcu_dereference(sta->link[link_id]);
117 			if (!link_sta)
118 				continue;
119 
120 			if (link_sta->ht_cap.ht_supported ||
121 			    link_sta->vht_cap.vht_supported ||
122 			    link_sta->eht_cap.has_eht ||
123 			    link_sta->he_cap.has_he) {
124 				is_legacy = false;
125 				max_rx_nss = max(max_rx_nss, link_sta->rx_nss);
126 			}
127 		}
128 		rcu_read_unlock();
129 
130 		if (!is_legacy) {
131 			switch (max_rx_nss) {
132 			case 1:
133 				watermark = SF_W_MARK_SISO;
134 				break;
135 			case 2:
136 				watermark = SF_W_MARK_MIMO2;
137 				break;
138 			default:
139 				watermark = SF_W_MARK_MIMO3;
140 				break;
141 			}
142 		} else {
143 			watermark = SF_W_MARK_LEGACY;
144 		}
145 	/* default watermark value for unassociated mode. */
146 	} else {
147 		watermark = SF_W_MARK_MIMO2;
148 	}
149 	sf_cmd->watermark[SF_FULL_ON] = cpu_to_le32(watermark);
150 
151 	for (i = 0; i < SF_NUM_SCENARIO; i++) {
152 		for (j = 0; j < SF_NUM_TIMEOUT_TYPES; j++) {
153 			sf_cmd->long_delay_timeouts[i][j] =
154 					cpu_to_le32(SF_LONG_DELAY_AGING_TIMER);
155 		}
156 	}
157 
158 	if (sta) {
159 		BUILD_BUG_ON(sizeof(sf_full_timeout) !=
160 			     sizeof(__le32) * SF_NUM_SCENARIO *
161 			     SF_NUM_TIMEOUT_TYPES);
162 
163 		memcpy(sf_cmd->full_on_timeouts, sf_full_timeout,
164 		       sizeof(sf_full_timeout));
165 	} else {
166 		BUILD_BUG_ON(sizeof(sf_full_timeout_def) !=
167 			     sizeof(__le32) * SF_NUM_SCENARIO *
168 			     SF_NUM_TIMEOUT_TYPES);
169 
170 		memcpy(sf_cmd->full_on_timeouts, sf_full_timeout_def,
171 		       sizeof(sf_full_timeout_def));
172 	}
173 }
174 
175 static int iwl_mvm_sf_config(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
176 			     enum iwl_sf_state new_state)
177 {
178 	struct iwl_sf_cfg_cmd sf_cmd = {
179 		.state = cpu_to_le32(new_state),
180 	};
181 	int ret = 0;
182 
183 	/*
184 	 * If an associated AP sta changed its antenna configuration, the state
185 	 * will remain FULL_ON but SF parameters need to be reconsidered.
186 	 */
187 	if (new_state != SF_FULL_ON && mvm->sf_state == new_state)
188 		return 0;
189 
190 	switch (new_state) {
191 	case SF_UNINIT:
192 		iwl_mvm_fill_sf_command(mvm, &sf_cmd, NULL);
193 		break;
194 	case SF_FULL_ON:
195 		if (!sta) {
196 			IWL_ERR(mvm,
197 				"No station: Cannot switch SF to FULL_ON\n");
198 			return -EINVAL;
199 		}
200 		iwl_mvm_fill_sf_command(mvm, &sf_cmd, sta);
201 		break;
202 	case SF_INIT_OFF:
203 		iwl_mvm_fill_sf_command(mvm, &sf_cmd, NULL);
204 		break;
205 	default:
206 		WARN_ONCE(1, "Invalid state: %d. not sending Smart Fifo cmd\n",
207 			  new_state);
208 		return -EINVAL;
209 	}
210 
211 	ret = iwl_mvm_send_cmd_pdu(mvm, REPLY_SF_CFG_CMD, CMD_ASYNC,
212 				   sizeof(sf_cmd), &sf_cmd);
213 	if (!ret)
214 		mvm->sf_state = new_state;
215 
216 	return ret;
217 }
218 
219 /*
220  * Update Smart fifo:
221  * Count bound interfaces that are not to be removed, ignoring p2p devices,
222  * and set new state accordingly.
223  */
224 int iwl_mvm_sf_update(struct iwl_mvm *mvm, struct ieee80211_vif *changed_vif,
225 		      bool remove_vif)
226 {
227 	enum iwl_sf_state new_state;
228 	struct iwl_mvm_vif *mvmvif = NULL;
229 	struct iwl_mvm_active_iface_iterator_data data = {
230 		.ignore_vif = changed_vif,
231 		.sta_vif_state = SF_UNINIT,
232 	};
233 	struct ieee80211_sta *sta = NULL;
234 
235 	/*
236 	 * Ignore the call if we are in HW Restart flow, or if the handled
237 	 * vif is a p2p device.
238 	 */
239 	if (test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status) ||
240 	    (changed_vif && changed_vif->type == NL80211_IFTYPE_P2P_DEVICE))
241 		return 0;
242 
243 	ieee80211_iterate_active_interfaces_atomic(mvm->hw,
244 						   IEEE80211_IFACE_ITER_NORMAL,
245 						   iwl_mvm_bound_iface_iterator,
246 						   &data);
247 
248 	/* If changed_vif exists and is not to be removed, add to the count */
249 	if (changed_vif && !remove_vif)
250 		data.num_active_macs++;
251 
252 	switch (data.num_active_macs) {
253 	case 0:
254 		/* If there are no active macs - change state to SF_INIT_OFF */
255 		new_state = SF_INIT_OFF;
256 		break;
257 	case 1:
258 		if (remove_vif) {
259 			/* The one active mac left is of type station
260 			 * and we filled the relevant data during iteration
261 			 */
262 			new_state = data.sta_vif_state;
263 			sta = data.sta_vif_ap_sta;
264 		} else {
265 			if (WARN_ON(!changed_vif))
266 				return -EINVAL;
267 			if (changed_vif->type != NL80211_IFTYPE_STATION) {
268 				new_state = SF_UNINIT;
269 			} else if (changed_vif->cfg.assoc &&
270 				   changed_vif->bss_conf.dtim_period) {
271 				mvmvif = iwl_mvm_vif_from_mac80211(changed_vif);
272 				sta = mvmvif->ap_sta;
273 				new_state = SF_FULL_ON;
274 			} else {
275 				new_state = SF_INIT_OFF;
276 			}
277 		}
278 		break;
279 	default:
280 		/* If there are multiple active macs - change to SF_UNINIT */
281 		new_state = SF_UNINIT;
282 	}
283 
284 	return iwl_mvm_sf_config(mvm, sta, new_state);
285 }
286