2 * mac80211 - channel management
5 #include <linux/nl80211.h>
6 #include <linux/export.h>
7 #include <linux/rtnetlink.h>
8 #include <net/cfg80211.h>
9 #include "ieee80211_i.h"
10 #include "driver-ops.h"
12 static void ieee80211_change_chandef(struct ieee80211_local *local,
13 struct ieee80211_chanctx *ctx,
14 const struct cfg80211_chan_def *chandef)
16 if (cfg80211_chandef_identical(&ctx->conf.def, chandef))
19 WARN_ON(!cfg80211_chandef_compatible(&ctx->conf.def, chandef));
21 ctx->conf.def = *chandef;
22 drv_change_chanctx(local, ctx, IEEE80211_CHANCTX_CHANGE_WIDTH);
24 if (!local->use_chanctx) {
25 local->_oper_channel_type = cfg80211_get_chandef_type(chandef);
26 ieee80211_hw_config(local, 0);
30 static struct ieee80211_chanctx *
31 ieee80211_find_chanctx(struct ieee80211_local *local,
32 const struct cfg80211_chan_def *chandef,
33 enum ieee80211_chanctx_mode mode)
35 struct ieee80211_chanctx *ctx;
37 lockdep_assert_held(&local->chanctx_mtx);
39 if (mode == IEEE80211_CHANCTX_EXCLUSIVE)
42 list_for_each_entry(ctx, &local->chanctx_list, list) {
43 const struct cfg80211_chan_def *compat;
45 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE)
48 compat = cfg80211_chandef_compatible(&ctx->conf.def, chandef);
52 ieee80211_change_chandef(local, ctx, compat);
60 static struct ieee80211_chanctx *
61 ieee80211_new_chanctx(struct ieee80211_local *local,
62 const struct cfg80211_chan_def *chandef,
63 enum ieee80211_chanctx_mode mode)
65 struct ieee80211_chanctx *ctx;
68 lockdep_assert_held(&local->chanctx_mtx);
70 ctx = kzalloc(sizeof(*ctx) + local->hw.chanctx_data_size, GFP_KERNEL);
72 return ERR_PTR(-ENOMEM);
74 ctx->conf.def = *chandef;
75 ctx->conf.rx_chains_static = 1;
76 ctx->conf.rx_chains_dynamic = 1;
79 if (!local->use_chanctx) {
80 local->_oper_channel_type =
81 cfg80211_get_chandef_type(chandef);
82 local->_oper_channel = chandef->chan;
83 ieee80211_hw_config(local, 0);
85 err = drv_add_chanctx(local, ctx);
92 list_add_rcu(&ctx->list, &local->chanctx_list);
97 static void ieee80211_free_chanctx(struct ieee80211_local *local,
98 struct ieee80211_chanctx *ctx)
100 lockdep_assert_held(&local->chanctx_mtx);
102 WARN_ON_ONCE(ctx->refcount != 0);
104 if (!local->use_chanctx) {
105 local->_oper_channel_type = NL80211_CHAN_NO_HT;
106 ieee80211_hw_config(local, 0);
108 drv_remove_chanctx(local, ctx);
111 list_del_rcu(&ctx->list);
112 kfree_rcu(ctx, rcu_head);
115 static int ieee80211_assign_vif_chanctx(struct ieee80211_sub_if_data *sdata,
116 struct ieee80211_chanctx *ctx)
118 struct ieee80211_local *local = sdata->local;
121 lockdep_assert_held(&local->chanctx_mtx);
123 ret = drv_assign_vif_chanctx(local, sdata, ctx);
127 rcu_assign_pointer(sdata->vif.chanctx_conf, &ctx->conf);
130 ieee80211_recalc_txpower(sdata);
135 static void ieee80211_recalc_chanctx_chantype(struct ieee80211_local *local,
136 struct ieee80211_chanctx *ctx)
138 struct ieee80211_chanctx_conf *conf = &ctx->conf;
139 struct ieee80211_sub_if_data *sdata;
140 const struct cfg80211_chan_def *compat = NULL;
142 lockdep_assert_held(&local->chanctx_mtx);
145 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
147 if (!ieee80211_sdata_running(sdata))
149 if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf)
153 compat = &sdata->vif.bss_conf.chandef;
155 compat = cfg80211_chandef_compatible(
156 &sdata->vif.bss_conf.chandef, compat);
162 if (WARN_ON_ONCE(!compat))
165 ieee80211_change_chandef(local, ctx, compat);
168 static void ieee80211_unassign_vif_chanctx(struct ieee80211_sub_if_data *sdata,
169 struct ieee80211_chanctx *ctx)
171 struct ieee80211_local *local = sdata->local;
173 lockdep_assert_held(&local->chanctx_mtx);
176 rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
178 drv_unassign_vif_chanctx(local, sdata, ctx);
180 if (ctx->refcount > 0) {
181 ieee80211_recalc_chanctx_chantype(sdata->local, ctx);
182 ieee80211_recalc_smps_chanctx(local, ctx);
186 static void __ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
188 struct ieee80211_local *local = sdata->local;
189 struct ieee80211_chanctx_conf *conf;
190 struct ieee80211_chanctx *ctx;
192 lockdep_assert_held(&local->chanctx_mtx);
194 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
195 lockdep_is_held(&local->chanctx_mtx));
199 ctx = container_of(conf, struct ieee80211_chanctx, conf);
201 if (sdata->vif.type == NL80211_IFTYPE_AP) {
202 struct ieee80211_sub_if_data *vlan;
204 /* for the VLAN list */
206 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
207 rcu_assign_pointer(vlan->vif.chanctx_conf, NULL);
210 ieee80211_unassign_vif_chanctx(sdata, ctx);
211 if (ctx->refcount == 0)
212 ieee80211_free_chanctx(local, ctx);
215 void ieee80211_recalc_smps_chanctx(struct ieee80211_local *local,
216 struct ieee80211_chanctx *chanctx)
218 struct ieee80211_sub_if_data *sdata;
219 u8 rx_chains_static, rx_chains_dynamic;
221 lockdep_assert_held(&local->chanctx_mtx);
223 rx_chains_static = 1;
224 rx_chains_dynamic = 1;
227 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
228 u8 needed_static, needed_dynamic;
230 if (!ieee80211_sdata_running(sdata))
233 if (rcu_access_pointer(sdata->vif.chanctx_conf) !=
237 switch (sdata->vif.type) {
238 case NL80211_IFTYPE_P2P_DEVICE:
240 case NL80211_IFTYPE_STATION:
241 if (!sdata->u.mgd.associated)
244 case NL80211_IFTYPE_AP_VLAN:
246 case NL80211_IFTYPE_AP:
247 case NL80211_IFTYPE_ADHOC:
248 case NL80211_IFTYPE_WDS:
249 case NL80211_IFTYPE_MESH_POINT:
255 switch (sdata->smps_mode) {
257 WARN_ONCE(1, "Invalid SMPS mode %d\n",
260 case IEEE80211_SMPS_OFF:
261 needed_static = sdata->needed_rx_chains;
262 needed_dynamic = sdata->needed_rx_chains;
264 case IEEE80211_SMPS_DYNAMIC:
266 needed_dynamic = sdata->needed_rx_chains;
268 case IEEE80211_SMPS_STATIC:
274 rx_chains_static = max(rx_chains_static, needed_static);
275 rx_chains_dynamic = max(rx_chains_dynamic, needed_dynamic);
279 if (!local->use_chanctx) {
280 if (rx_chains_static > 1)
281 local->smps_mode = IEEE80211_SMPS_OFF;
282 else if (rx_chains_dynamic > 1)
283 local->smps_mode = IEEE80211_SMPS_DYNAMIC;
285 local->smps_mode = IEEE80211_SMPS_STATIC;
286 ieee80211_hw_config(local, 0);
289 if (rx_chains_static == chanctx->conf.rx_chains_static &&
290 rx_chains_dynamic == chanctx->conf.rx_chains_dynamic)
293 chanctx->conf.rx_chains_static = rx_chains_static;
294 chanctx->conf.rx_chains_dynamic = rx_chains_dynamic;
295 drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RX_CHAINS);
298 int ieee80211_vif_use_channel(struct ieee80211_sub_if_data *sdata,
299 const struct cfg80211_chan_def *chandef,
300 enum ieee80211_chanctx_mode mode)
302 struct ieee80211_local *local = sdata->local;
303 struct ieee80211_chanctx *ctx;
306 WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));
308 mutex_lock(&local->chanctx_mtx);
309 __ieee80211_vif_release_channel(sdata);
311 ctx = ieee80211_find_chanctx(local, chandef, mode);
313 ctx = ieee80211_new_chanctx(local, chandef, mode);
319 sdata->vif.bss_conf.chandef = *chandef;
321 ret = ieee80211_assign_vif_chanctx(sdata, ctx);
323 /* if assign fails refcount stays the same */
324 if (ctx->refcount == 0)
325 ieee80211_free_chanctx(local, ctx);
329 if (sdata->vif.type == NL80211_IFTYPE_AP) {
330 struct ieee80211_sub_if_data *vlan;
332 /* for the VLAN list */
334 list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
335 rcu_assign_pointer(vlan->vif.chanctx_conf, &ctx->conf);
338 ieee80211_recalc_smps_chanctx(local, ctx);
340 mutex_unlock(&local->chanctx_mtx);
344 void ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
346 WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));
348 mutex_lock(&sdata->local->chanctx_mtx);
349 __ieee80211_vif_release_channel(sdata);
350 mutex_unlock(&sdata->local->chanctx_mtx);
353 void ieee80211_vif_vlan_copy_chanctx(struct ieee80211_sub_if_data *sdata)
355 struct ieee80211_local *local = sdata->local;
356 struct ieee80211_sub_if_data *ap;
357 struct ieee80211_chanctx_conf *conf;
359 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->bss))
362 ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
364 mutex_lock(&local->chanctx_mtx);
366 conf = rcu_dereference_protected(ap->vif.chanctx_conf,
367 lockdep_is_held(&local->chanctx_mtx));
368 rcu_assign_pointer(sdata->vif.chanctx_conf, conf);
369 mutex_unlock(&local->chanctx_mtx);
372 void ieee80211_iter_chan_contexts_atomic(
373 struct ieee80211_hw *hw,
374 void (*iter)(struct ieee80211_hw *hw,
375 struct ieee80211_chanctx_conf *chanctx_conf,
379 struct ieee80211_local *local = hw_to_local(hw);
380 struct ieee80211_chanctx *ctx;
383 list_for_each_entry_rcu(ctx, &local->chanctx_list, list)
384 iter(hw, &ctx->conf, iter_data);
387 EXPORT_SYMBOL_GPL(ieee80211_iter_chan_contexts_atomic);