1 // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
2 /*
3  * Copyright (C) 2013-2014, 2018-2019 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 	u8 sta_vif_ap_sta_id;
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->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_id = mvmvif->ap_sta_id;
34 		if (vif->bss_conf.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 
102 	sf_cmd->watermark[SF_LONG_DELAY_ON] = cpu_to_le32(SF_W_MARK_SCAN);
103 
104 	/*
105 	 * If we are in association flow - check antenna configuration
106 	 * capabilities of the AP station, and choose the watermark accordingly.
107 	 */
108 	if (sta) {
109 		if (sta->ht_cap.ht_supported ||
110 		    sta->vht_cap.vht_supported ||
111 		    sta->he_cap.has_he) {
112 			switch (sta->rx_nss) {
113 			case 1:
114 				watermark = SF_W_MARK_SISO;
115 				break;
116 			case 2:
117 				watermark = SF_W_MARK_MIMO2;
118 				break;
119 			default:
120 				watermark = SF_W_MARK_MIMO3;
121 				break;
122 			}
123 		} else {
124 			watermark = SF_W_MARK_LEGACY;
125 		}
126 	/* default watermark value for unassociated mode. */
127 	} else {
128 		watermark = SF_W_MARK_MIMO2;
129 	}
130 	sf_cmd->watermark[SF_FULL_ON] = cpu_to_le32(watermark);
131 
132 	for (i = 0; i < SF_NUM_SCENARIO; i++) {
133 		for (j = 0; j < SF_NUM_TIMEOUT_TYPES; j++) {
134 			sf_cmd->long_delay_timeouts[i][j] =
135 					cpu_to_le32(SF_LONG_DELAY_AGING_TIMER);
136 		}
137 	}
138 
139 	if (sta) {
140 		BUILD_BUG_ON(sizeof(sf_full_timeout) !=
141 			     sizeof(__le32) * SF_NUM_SCENARIO *
142 			     SF_NUM_TIMEOUT_TYPES);
143 
144 		memcpy(sf_cmd->full_on_timeouts, sf_full_timeout,
145 		       sizeof(sf_full_timeout));
146 	} else {
147 		BUILD_BUG_ON(sizeof(sf_full_timeout_def) !=
148 			     sizeof(__le32) * SF_NUM_SCENARIO *
149 			     SF_NUM_TIMEOUT_TYPES);
150 
151 		memcpy(sf_cmd->full_on_timeouts, sf_full_timeout_def,
152 		       sizeof(sf_full_timeout_def));
153 	}
154 
155 }
156 
157 static int iwl_mvm_sf_config(struct iwl_mvm *mvm, u8 sta_id,
158 			     enum iwl_sf_state new_state)
159 {
160 	struct iwl_sf_cfg_cmd sf_cmd = {
161 		.state = cpu_to_le32(new_state),
162 	};
163 	struct ieee80211_sta *sta;
164 	int ret = 0;
165 
166 	if (mvm->cfg->disable_dummy_notification)
167 		sf_cmd.state |= cpu_to_le32(SF_CFG_DUMMY_NOTIF_OFF);
168 
169 	/*
170 	 * If an associated AP sta changed its antenna configuration, the state
171 	 * will remain FULL_ON but SF parameters need to be reconsidered.
172 	 */
173 	if (new_state != SF_FULL_ON && mvm->sf_state == new_state)
174 		return 0;
175 
176 	switch (new_state) {
177 	case SF_UNINIT:
178 		iwl_mvm_fill_sf_command(mvm, &sf_cmd, NULL);
179 		break;
180 	case SF_FULL_ON:
181 		if (sta_id == IWL_MVM_INVALID_STA) {
182 			IWL_ERR(mvm,
183 				"No station: Cannot switch SF to FULL_ON\n");
184 			return -EINVAL;
185 		}
186 		rcu_read_lock();
187 		sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]);
188 		if (IS_ERR_OR_NULL(sta)) {
189 			IWL_ERR(mvm, "Invalid station id\n");
190 			rcu_read_unlock();
191 			return -EINVAL;
192 		}
193 		iwl_mvm_fill_sf_command(mvm, &sf_cmd, sta);
194 		rcu_read_unlock();
195 		break;
196 	case SF_INIT_OFF:
197 		iwl_mvm_fill_sf_command(mvm, &sf_cmd, NULL);
198 		break;
199 	default:
200 		WARN_ONCE(1, "Invalid state: %d. not sending Smart Fifo cmd\n",
201 			  new_state);
202 		return -EINVAL;
203 	}
204 
205 	ret = iwl_mvm_send_cmd_pdu(mvm, REPLY_SF_CFG_CMD, CMD_ASYNC,
206 				   sizeof(sf_cmd), &sf_cmd);
207 	if (!ret)
208 		mvm->sf_state = new_state;
209 
210 	return ret;
211 }
212 
213 /*
214  * Update Smart fifo:
215  * Count bound interfaces that are not to be removed, ignoring p2p devices,
216  * and set new state accordingly.
217  */
218 int iwl_mvm_sf_update(struct iwl_mvm *mvm, struct ieee80211_vif *changed_vif,
219 		      bool remove_vif)
220 {
221 	enum iwl_sf_state new_state;
222 	u8 sta_id = IWL_MVM_INVALID_STA;
223 	struct iwl_mvm_vif *mvmvif = NULL;
224 	struct iwl_mvm_active_iface_iterator_data data = {
225 		.ignore_vif = changed_vif,
226 		.sta_vif_state = SF_UNINIT,
227 		.sta_vif_ap_sta_id = IWL_MVM_INVALID_STA,
228 	};
229 
230 	/*
231 	 * Ignore the call if we are in HW Restart flow, or if the handled
232 	 * vif is a p2p device.
233 	 */
234 	if (test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status) ||
235 	    (changed_vif && changed_vif->type == NL80211_IFTYPE_P2P_DEVICE))
236 		return 0;
237 
238 	ieee80211_iterate_active_interfaces_atomic(mvm->hw,
239 						   IEEE80211_IFACE_ITER_NORMAL,
240 						   iwl_mvm_bound_iface_iterator,
241 						   &data);
242 
243 	/* If changed_vif exists and is not to be removed, add to the count */
244 	if (changed_vif && !remove_vif)
245 		data.num_active_macs++;
246 
247 	switch (data.num_active_macs) {
248 	case 0:
249 		/* If there are no active macs - change state to SF_INIT_OFF */
250 		new_state = SF_INIT_OFF;
251 		break;
252 	case 1:
253 		if (remove_vif) {
254 			/* The one active mac left is of type station
255 			 * and we filled the relevant data during iteration
256 			 */
257 			new_state = data.sta_vif_state;
258 			sta_id = data.sta_vif_ap_sta_id;
259 		} else {
260 			if (WARN_ON(!changed_vif))
261 				return -EINVAL;
262 			if (changed_vif->type != NL80211_IFTYPE_STATION) {
263 				new_state = SF_UNINIT;
264 			} else if (changed_vif->bss_conf.assoc &&
265 				   changed_vif->bss_conf.dtim_period) {
266 				mvmvif = iwl_mvm_vif_from_mac80211(changed_vif);
267 				sta_id = mvmvif->ap_sta_id;
268 				new_state = SF_FULL_ON;
269 			} else {
270 				new_state = SF_INIT_OFF;
271 			}
272 		}
273 		break;
274 	default:
275 		/* If there are multiple active macs - change to SF_UNINIT */
276 		new_state = SF_UNINIT;
277 	}
278 	return iwl_mvm_sf_config(mvm, sta_id, new_state);
279 }
280