1 // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
2 /*
3  * Copyright (C) 2012-2014, 2018, 2021-2022 Intel Corporation
4  * Copyright (C) 2013-2014 Intel Mobile Communications GmbH
5  * Copyright (C) 2016-2017 Intel Deutschland GmbH
6  */
7 #include <net/mac80211.h>
8 #include "fw-api.h"
9 #include "mvm.h"
10 
11 #define QUOTA_100	IWL_MVM_MAX_QUOTA
12 #define QUOTA_LOWLAT_MIN ((QUOTA_100 * IWL_MVM_LOWLAT_QUOTA_MIN_PERCENT) / 100)
13 
14 struct iwl_mvm_quota_iterator_data {
15 	int n_interfaces[MAX_BINDINGS];
16 	int colors[MAX_BINDINGS];
17 	int low_latency[MAX_BINDINGS];
18 #ifdef CONFIG_IWLWIFI_DEBUGFS
19 	int dbgfs_min[MAX_BINDINGS];
20 #endif
21 	int n_low_latency_bindings;
22 	struct ieee80211_vif *disabled_vif;
23 };
24 
25 static void iwl_mvm_quota_iterator(void *_data, u8 *mac,
26 				   struct ieee80211_vif *vif)
27 {
28 	struct iwl_mvm_quota_iterator_data *data = _data;
29 	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
30 	u16 id;
31 
32 	/* skip disabled interfaces here immediately */
33 	if (vif == data->disabled_vif)
34 		return;
35 
36 	if (!mvmvif->deflink.phy_ctxt)
37 		return;
38 
39 	/* currently, PHY ID == binding ID */
40 	id = mvmvif->deflink.phy_ctxt->id;
41 
42 	/* need at least one binding per PHY */
43 	BUILD_BUG_ON(NUM_PHY_CTX > MAX_BINDINGS);
44 
45 	if (WARN_ON_ONCE(id >= MAX_BINDINGS))
46 		return;
47 
48 	switch (vif->type) {
49 	case NL80211_IFTYPE_STATION:
50 		if (vif->cfg.assoc)
51 			break;
52 		return;
53 	case NL80211_IFTYPE_AP:
54 	case NL80211_IFTYPE_ADHOC:
55 		if (mvmvif->ap_ibss_active)
56 			break;
57 		return;
58 	case NL80211_IFTYPE_MONITOR:
59 		if (mvmvif->monitor_active)
60 			break;
61 		return;
62 	case NL80211_IFTYPE_P2P_DEVICE:
63 		return;
64 	default:
65 		WARN_ON_ONCE(1);
66 		return;
67 	}
68 
69 	if (data->colors[id] < 0)
70 		data->colors[id] = mvmvif->deflink.phy_ctxt->color;
71 	else
72 		WARN_ON_ONCE(data->colors[id] !=
73 			     mvmvif->deflink.phy_ctxt->color);
74 
75 	data->n_interfaces[id]++;
76 
77 #ifdef CONFIG_IWLWIFI_DEBUGFS
78 	if (mvmvif->dbgfs_quota_min)
79 		data->dbgfs_min[id] = max(data->dbgfs_min[id],
80 					  mvmvif->dbgfs_quota_min);
81 #endif
82 
83 	if (iwl_mvm_vif_low_latency(mvmvif) && !data->low_latency[id]) {
84 		data->n_low_latency_bindings++;
85 		data->low_latency[id] = true;
86 	}
87 }
88 
89 static void iwl_mvm_adjust_quota_for_noa(struct iwl_mvm *mvm,
90 					 struct iwl_time_quota_cmd *cmd)
91 {
92 #ifdef CONFIG_NL80211_TESTMODE
93 	struct iwl_mvm_vif *mvmvif;
94 	int i, phy_id = -1, beacon_int = 0;
95 
96 	if (!mvm->noa_duration || !mvm->noa_vif)
97 		return;
98 
99 	mvmvif = iwl_mvm_vif_from_mac80211(mvm->noa_vif);
100 	if (!mvmvif->ap_ibss_active)
101 		return;
102 
103 	phy_id = mvmvif->deflink.phy_ctxt->id;
104 	beacon_int = mvm->noa_vif->bss_conf.beacon_int;
105 
106 	for (i = 0; i < MAX_BINDINGS; i++) {
107 		struct iwl_time_quota_data *data =
108 					iwl_mvm_quota_cmd_get_quota(mvm, cmd,
109 								    i);
110 		u32 id_n_c = le32_to_cpu(data->id_and_color);
111 		u32 id = (id_n_c & FW_CTXT_ID_MSK) >> FW_CTXT_ID_POS;
112 		u32 quota = le32_to_cpu(data->quota);
113 
114 		if (id != phy_id)
115 			continue;
116 
117 		quota *= (beacon_int - mvm->noa_duration);
118 		quota /= beacon_int;
119 
120 		IWL_DEBUG_QUOTA(mvm, "quota: adjust for NoA from %d to %d\n",
121 				le32_to_cpu(data->quota), quota);
122 
123 		data->quota = cpu_to_le32(quota);
124 	}
125 #endif
126 }
127 
128 int iwl_mvm_update_quotas(struct iwl_mvm *mvm,
129 			  bool force_update,
130 			  struct ieee80211_vif *disabled_vif)
131 {
132 	struct iwl_time_quota_cmd cmd = {};
133 	int i, idx, err, num_active_macs, quota, quota_rem, n_non_lowlat;
134 	struct iwl_mvm_quota_iterator_data data = {
135 		.n_interfaces = {},
136 		.colors = { -1, -1, -1, -1 },
137 		.disabled_vif = disabled_vif,
138 	};
139 	struct iwl_time_quota_cmd *last = &mvm->last_quota_cmd;
140 	struct iwl_time_quota_data *qdata, *last_data;
141 	bool send = false;
142 
143 	lockdep_assert_held(&mvm->mutex);
144 
145 	if (fw_has_capa(&mvm->fw->ucode_capa,
146 			IWL_UCODE_TLV_CAPA_DYNAMIC_QUOTA))
147 		return 0;
148 
149 	/* update all upon completion */
150 	if (test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status))
151 		return 0;
152 
153 	/* iterator data above must match */
154 	BUILD_BUG_ON(MAX_BINDINGS != 4);
155 
156 	ieee80211_iterate_active_interfaces_atomic(
157 		mvm->hw, IEEE80211_IFACE_ITER_NORMAL,
158 		iwl_mvm_quota_iterator, &data);
159 
160 	/*
161 	 * The FW's scheduling session consists of
162 	 * IWL_MVM_MAX_QUOTA fragments. Divide these fragments
163 	 * equally between all the bindings that require quota
164 	 */
165 	num_active_macs = 0;
166 	for (i = 0; i < MAX_BINDINGS; i++) {
167 		qdata = iwl_mvm_quota_cmd_get_quota(mvm, &cmd, i);
168 		qdata->id_and_color = cpu_to_le32(FW_CTXT_INVALID);
169 		num_active_macs += data.n_interfaces[i];
170 	}
171 
172 	n_non_lowlat = num_active_macs;
173 
174 	if (data.n_low_latency_bindings == 1) {
175 		for (i = 0; i < MAX_BINDINGS; i++) {
176 			if (data.low_latency[i]) {
177 				n_non_lowlat -= data.n_interfaces[i];
178 				break;
179 			}
180 		}
181 	}
182 
183 	if (data.n_low_latency_bindings == 1 && n_non_lowlat) {
184 		/*
185 		 * Reserve quota for the low latency binding in case that
186 		 * there are several data bindings but only a single
187 		 * low latency one. Split the rest of the quota equally
188 		 * between the other data interfaces.
189 		 */
190 		quota = (QUOTA_100 - QUOTA_LOWLAT_MIN) / n_non_lowlat;
191 		quota_rem = QUOTA_100 - n_non_lowlat * quota -
192 			    QUOTA_LOWLAT_MIN;
193 		IWL_DEBUG_QUOTA(mvm,
194 				"quota: low-latency binding active, remaining quota per other binding: %d\n",
195 				quota);
196 	} else if (num_active_macs) {
197 		/*
198 		 * There are 0 or more than 1 low latency bindings, or all the
199 		 * data interfaces belong to the single low latency binding.
200 		 * Split the quota equally between the data interfaces.
201 		 */
202 		quota = QUOTA_100 / num_active_macs;
203 		quota_rem = QUOTA_100 % num_active_macs;
204 		IWL_DEBUG_QUOTA(mvm,
205 				"quota: splitting evenly per binding: %d\n",
206 				quota);
207 	} else {
208 		/* values don't really matter - won't be used */
209 		quota = 0;
210 		quota_rem = 0;
211 	}
212 
213 	for (idx = 0, i = 0; i < MAX_BINDINGS; i++) {
214 		if (data.colors[i] < 0)
215 			continue;
216 
217 		qdata = iwl_mvm_quota_cmd_get_quota(mvm, &cmd, idx);
218 
219 		qdata->id_and_color =
220 			cpu_to_le32(FW_CMD_ID_AND_COLOR(i, data.colors[i]));
221 
222 		if (data.n_interfaces[i] <= 0)
223 			qdata->quota = cpu_to_le32(0);
224 #ifdef CONFIG_IWLWIFI_DEBUGFS
225 		else if (data.dbgfs_min[i])
226 			qdata->quota =
227 				cpu_to_le32(data.dbgfs_min[i] * QUOTA_100 / 100);
228 #endif
229 		else if (data.n_low_latency_bindings == 1 && n_non_lowlat &&
230 			 data.low_latency[i])
231 			/*
232 			 * There is more than one binding, but only one of the
233 			 * bindings is in low latency. For this case, allocate
234 			 * the minimal required quota for the low latency
235 			 * binding.
236 			 */
237 			qdata->quota = cpu_to_le32(QUOTA_LOWLAT_MIN);
238 		else
239 			qdata->quota =
240 				cpu_to_le32(quota * data.n_interfaces[i]);
241 
242 		WARN_ONCE(le32_to_cpu(qdata->quota) > QUOTA_100,
243 			  "Binding=%d, quota=%u > max=%u\n",
244 			  idx, le32_to_cpu(qdata->quota), QUOTA_100);
245 
246 		qdata->max_duration = cpu_to_le32(0);
247 
248 		idx++;
249 	}
250 
251 	/* Give the remainder of the session to the first data binding */
252 	for (i = 0; i < MAX_BINDINGS; i++) {
253 		qdata = iwl_mvm_quota_cmd_get_quota(mvm, &cmd, i);
254 		if (le32_to_cpu(qdata->quota) != 0) {
255 			le32_add_cpu(&qdata->quota, quota_rem);
256 			IWL_DEBUG_QUOTA(mvm,
257 					"quota: giving remainder of %d to binding %d\n",
258 					quota_rem, i);
259 			break;
260 		}
261 	}
262 
263 	iwl_mvm_adjust_quota_for_noa(mvm, &cmd);
264 
265 	/* check that we have non-zero quota for all valid bindings */
266 	for (i = 0; i < MAX_BINDINGS; i++) {
267 		qdata = iwl_mvm_quota_cmd_get_quota(mvm, &cmd, i);
268 		last_data = iwl_mvm_quota_cmd_get_quota(mvm, last, i);
269 		if (qdata->id_and_color != last_data->id_and_color)
270 			send = true;
271 		if (qdata->max_duration != last_data->max_duration)
272 			send = true;
273 		if (abs((int)le32_to_cpu(qdata->quota) -
274 			(int)le32_to_cpu(last_data->quota))
275 						> IWL_MVM_QUOTA_THRESHOLD)
276 			send = true;
277 		if (qdata->id_and_color == cpu_to_le32(FW_CTXT_INVALID))
278 			continue;
279 		WARN_ONCE(qdata->quota == 0,
280 			  "zero quota on binding %d\n", i);
281 	}
282 
283 	if (!send && !force_update) {
284 		/* don't send a practically unchanged command, the firmware has
285 		 * to re-initialize a lot of state and that can have an adverse
286 		 * impact on it
287 		 */
288 		return 0;
289 	}
290 
291 	err = iwl_mvm_send_cmd_pdu(mvm, TIME_QUOTA_CMD, 0,
292 				   iwl_mvm_quota_cmd_size(mvm), &cmd);
293 
294 	if (err)
295 		IWL_ERR(mvm, "Failed to send quota: %d\n", err);
296 	else
297 		mvm->last_quota_cmd = cmd;
298 	return err;
299 }
300