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1 /*
2  * Copyright 2015 Intel Deutschland GmbH
3  *
4  * This program is free software; you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License version 2 as
6  * published by the Free Software Foundation.
7  */
8 #include <net/mac80211.h>
9 #include "ieee80211_i.h"
10 #include "trace.h"
11 #include "driver-ops.h"
12 
drv_start(struct ieee80211_local * local)13 int drv_start(struct ieee80211_local *local)
14 {
15 	int ret;
16 
17 	might_sleep();
18 
19 	if (WARN_ON(local->started))
20 		return -EALREADY;
21 
22 	trace_drv_start(local);
23 	local->started = true;
24 	/* allow rx frames */
25 	smp_mb();
26 	ret = local->ops->start(&local->hw);
27 	trace_drv_return_int(local, ret);
28 
29 	if (ret)
30 		local->started = false;
31 
32 	return ret;
33 }
34 
drv_stop(struct ieee80211_local * local)35 void drv_stop(struct ieee80211_local *local)
36 {
37 	might_sleep();
38 
39 	if (WARN_ON(!local->started))
40 		return;
41 
42 	trace_drv_stop(local);
43 	local->ops->stop(&local->hw);
44 	trace_drv_return_void(local);
45 
46 	/* sync away all work on the tasklet before clearing started */
47 	tasklet_disable(&local->tasklet);
48 	tasklet_enable(&local->tasklet);
49 
50 	barrier();
51 
52 	local->started = false;
53 }
54 
drv_add_interface(struct ieee80211_local * local,struct ieee80211_sub_if_data * sdata)55 int drv_add_interface(struct ieee80211_local *local,
56 		      struct ieee80211_sub_if_data *sdata)
57 {
58 	int ret;
59 
60 	might_sleep();
61 
62 	if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
63 		    (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
64 		     !ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF) &&
65 		     !(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))))
66 		return -EINVAL;
67 
68 	trace_drv_add_interface(local, sdata);
69 	ret = local->ops->add_interface(&local->hw, &sdata->vif);
70 	trace_drv_return_int(local, ret);
71 
72 	if (ret == 0)
73 		sdata->flags |= IEEE80211_SDATA_IN_DRIVER;
74 
75 	return ret;
76 }
77 
drv_change_interface(struct ieee80211_local * local,struct ieee80211_sub_if_data * sdata,enum nl80211_iftype type,bool p2p)78 int drv_change_interface(struct ieee80211_local *local,
79 			 struct ieee80211_sub_if_data *sdata,
80 			 enum nl80211_iftype type, bool p2p)
81 {
82 	int ret;
83 
84 	might_sleep();
85 
86 	if (!check_sdata_in_driver(sdata))
87 		return -EIO;
88 
89 	trace_drv_change_interface(local, sdata, type, p2p);
90 	ret = local->ops->change_interface(&local->hw, &sdata->vif, type, p2p);
91 	trace_drv_return_int(local, ret);
92 	return ret;
93 }
94 
drv_remove_interface(struct ieee80211_local * local,struct ieee80211_sub_if_data * sdata)95 void drv_remove_interface(struct ieee80211_local *local,
96 			  struct ieee80211_sub_if_data *sdata)
97 {
98 	might_sleep();
99 
100 	if (!check_sdata_in_driver(sdata))
101 		return;
102 
103 	trace_drv_remove_interface(local, sdata);
104 	local->ops->remove_interface(&local->hw, &sdata->vif);
105 	sdata->flags &= ~IEEE80211_SDATA_IN_DRIVER;
106 	trace_drv_return_void(local);
107 }
108 
109 __must_check
drv_sta_state(struct ieee80211_local * local,struct ieee80211_sub_if_data * sdata,struct sta_info * sta,enum ieee80211_sta_state old_state,enum ieee80211_sta_state new_state)110 int drv_sta_state(struct ieee80211_local *local,
111 		  struct ieee80211_sub_if_data *sdata,
112 		  struct sta_info *sta,
113 		  enum ieee80211_sta_state old_state,
114 		  enum ieee80211_sta_state new_state)
115 {
116 	int ret = 0;
117 
118 	might_sleep();
119 
120 	sdata = get_bss_sdata(sdata);
121 	if (!check_sdata_in_driver(sdata))
122 		return -EIO;
123 
124 	trace_drv_sta_state(local, sdata, &sta->sta, old_state, new_state);
125 	if (local->ops->sta_state) {
126 		ret = local->ops->sta_state(&local->hw, &sdata->vif, &sta->sta,
127 					    old_state, new_state);
128 	} else if (old_state == IEEE80211_STA_AUTH &&
129 		   new_state == IEEE80211_STA_ASSOC) {
130 		ret = drv_sta_add(local, sdata, &sta->sta);
131 		if (ret == 0) {
132 			sta->uploaded = true;
133 			if (rcu_access_pointer(sta->sta.rates))
134 				drv_sta_rate_tbl_update(local, sdata, &sta->sta);
135 		}
136 	} else if (old_state == IEEE80211_STA_ASSOC &&
137 		   new_state == IEEE80211_STA_AUTH) {
138 		drv_sta_remove(local, sdata, &sta->sta);
139 	}
140 	trace_drv_return_int(local, ret);
141 	return ret;
142 }
143 
drv_sta_rc_update(struct ieee80211_local * local,struct ieee80211_sub_if_data * sdata,struct ieee80211_sta * sta,u32 changed)144 void drv_sta_rc_update(struct ieee80211_local *local,
145 		       struct ieee80211_sub_if_data *sdata,
146 		       struct ieee80211_sta *sta, u32 changed)
147 {
148 	sdata = get_bss_sdata(sdata);
149 	if (!check_sdata_in_driver(sdata))
150 		return;
151 
152 	WARN_ON(changed & IEEE80211_RC_SUPP_RATES_CHANGED &&
153 		(sdata->vif.type != NL80211_IFTYPE_ADHOC &&
154 		 sdata->vif.type != NL80211_IFTYPE_MESH_POINT));
155 
156 	trace_drv_sta_rc_update(local, sdata, sta, changed);
157 	if (local->ops->sta_rc_update)
158 		local->ops->sta_rc_update(&local->hw, &sdata->vif,
159 					  sta, changed);
160 
161 	trace_drv_return_void(local);
162 }
163 
drv_conf_tx(struct ieee80211_local * local,struct ieee80211_sub_if_data * sdata,u16 ac,const struct ieee80211_tx_queue_params * params)164 int drv_conf_tx(struct ieee80211_local *local,
165 		struct ieee80211_sub_if_data *sdata, u16 ac,
166 		const struct ieee80211_tx_queue_params *params)
167 {
168 	int ret = -EOPNOTSUPP;
169 
170 	might_sleep();
171 
172 	if (!check_sdata_in_driver(sdata))
173 		return -EIO;
174 
175 	if (params->cw_min == 0 || params->cw_min > params->cw_max) {
176 		/*
177 		 * If we can't configure hardware anyway, don't warn. We may
178 		 * never have initialized the CW parameters.
179 		 */
180 		WARN_ONCE(local->ops->conf_tx,
181 			  "%s: invalid CW_min/CW_max: %d/%d\n",
182 			  sdata->name, params->cw_min, params->cw_max);
183 		return -EINVAL;
184 	}
185 
186 	trace_drv_conf_tx(local, sdata, ac, params);
187 	if (local->ops->conf_tx)
188 		ret = local->ops->conf_tx(&local->hw, &sdata->vif,
189 					  ac, params);
190 	trace_drv_return_int(local, ret);
191 	return ret;
192 }
193 
drv_get_tsf(struct ieee80211_local * local,struct ieee80211_sub_if_data * sdata)194 u64 drv_get_tsf(struct ieee80211_local *local,
195 		struct ieee80211_sub_if_data *sdata)
196 {
197 	u64 ret = -1ULL;
198 
199 	might_sleep();
200 
201 	if (!check_sdata_in_driver(sdata))
202 		return ret;
203 
204 	trace_drv_get_tsf(local, sdata);
205 	if (local->ops->get_tsf)
206 		ret = local->ops->get_tsf(&local->hw, &sdata->vif);
207 	trace_drv_return_u64(local, ret);
208 	return ret;
209 }
210 
drv_set_tsf(struct ieee80211_local * local,struct ieee80211_sub_if_data * sdata,u64 tsf)211 void drv_set_tsf(struct ieee80211_local *local,
212 		 struct ieee80211_sub_if_data *sdata,
213 		 u64 tsf)
214 {
215 	might_sleep();
216 
217 	if (!check_sdata_in_driver(sdata))
218 		return;
219 
220 	trace_drv_set_tsf(local, sdata, tsf);
221 	if (local->ops->set_tsf)
222 		local->ops->set_tsf(&local->hw, &sdata->vif, tsf);
223 	trace_drv_return_void(local);
224 }
225 
drv_reset_tsf(struct ieee80211_local * local,struct ieee80211_sub_if_data * sdata)226 void drv_reset_tsf(struct ieee80211_local *local,
227 		   struct ieee80211_sub_if_data *sdata)
228 {
229 	might_sleep();
230 
231 	if (!check_sdata_in_driver(sdata))
232 		return;
233 
234 	trace_drv_reset_tsf(local, sdata);
235 	if (local->ops->reset_tsf)
236 		local->ops->reset_tsf(&local->hw, &sdata->vif);
237 	trace_drv_return_void(local);
238 }
239 
drv_switch_vif_chanctx(struct ieee80211_local * local,struct ieee80211_vif_chanctx_switch * vifs,int n_vifs,enum ieee80211_chanctx_switch_mode mode)240 int drv_switch_vif_chanctx(struct ieee80211_local *local,
241 			   struct ieee80211_vif_chanctx_switch *vifs,
242 			   int n_vifs, enum ieee80211_chanctx_switch_mode mode)
243 {
244 	int ret = 0;
245 	int i;
246 
247 	might_sleep();
248 
249 	if (!local->ops->switch_vif_chanctx)
250 		return -EOPNOTSUPP;
251 
252 	for (i = 0; i < n_vifs; i++) {
253 		struct ieee80211_chanctx *new_ctx =
254 			container_of(vifs[i].new_ctx,
255 				     struct ieee80211_chanctx,
256 				     conf);
257 		struct ieee80211_chanctx *old_ctx =
258 			container_of(vifs[i].old_ctx,
259 				     struct ieee80211_chanctx,
260 				     conf);
261 
262 		WARN_ON_ONCE(!old_ctx->driver_present);
263 		WARN_ON_ONCE((mode == CHANCTX_SWMODE_SWAP_CONTEXTS &&
264 			      new_ctx->driver_present) ||
265 			     (mode == CHANCTX_SWMODE_REASSIGN_VIF &&
266 			      !new_ctx->driver_present));
267 	}
268 
269 	trace_drv_switch_vif_chanctx(local, vifs, n_vifs, mode);
270 	ret = local->ops->switch_vif_chanctx(&local->hw,
271 					     vifs, n_vifs, mode);
272 	trace_drv_return_int(local, ret);
273 
274 	if (!ret && mode == CHANCTX_SWMODE_SWAP_CONTEXTS) {
275 		for (i = 0; i < n_vifs; i++) {
276 			struct ieee80211_chanctx *new_ctx =
277 				container_of(vifs[i].new_ctx,
278 					     struct ieee80211_chanctx,
279 					     conf);
280 			struct ieee80211_chanctx *old_ctx =
281 				container_of(vifs[i].old_ctx,
282 					     struct ieee80211_chanctx,
283 					     conf);
284 
285 			new_ctx->driver_present = true;
286 			old_ctx->driver_present = false;
287 		}
288 	}
289 
290 	return ret;
291 }
292 
drv_ampdu_action(struct ieee80211_local * local,struct ieee80211_sub_if_data * sdata,struct ieee80211_ampdu_params * params)293 int drv_ampdu_action(struct ieee80211_local *local,
294 		     struct ieee80211_sub_if_data *sdata,
295 		     struct ieee80211_ampdu_params *params)
296 {
297 	int ret = -EOPNOTSUPP;
298 
299 	might_sleep();
300 
301 	sdata = get_bss_sdata(sdata);
302 	if (!check_sdata_in_driver(sdata))
303 		return -EIO;
304 
305 	trace_drv_ampdu_action(local, sdata, params);
306 
307 	if (local->ops->ampdu_action)
308 		ret = local->ops->ampdu_action(&local->hw, &sdata->vif, params);
309 
310 	trace_drv_return_int(local, ret);
311 
312 	return ret;
313 }
314