[deliverable/linux.git] / net / mac80211 / chan.c

/*
 * mac80211 - channel management
 */

#include <linux/nl80211.h>
#include <linux/export.h>
#include <linux/rtnetlink.h>
#include <net/cfg80211.h>
#include "ieee80211_i.h"
#include "driver-ops.h"

static void ieee80211_change_chandef(struct ieee80211_local *local,
				     struct ieee80211_chanctx *ctx,
				     const struct cfg80211_chan_def *chandef)
{
	if (cfg80211_chandef_identical(&ctx->conf.def, chandef))
		return;

	WARN_ON(!cfg80211_chandef_compatible(&ctx->conf.def, chandef));

	ctx->conf.def = *chandef;
	drv_change_chanctx(local, ctx, IEEE80211_CHANCTX_CHANGE_WIDTH);

	if (!local->use_chanctx) {
		local->_oper_channel_type = cfg80211_get_chandef_type(chandef);
		ieee80211_hw_config(local, 0);
	}
}

static struct ieee80211_chanctx *
ieee80211_find_chanctx(struct ieee80211_local *local,
		       const struct cfg80211_chan_def *chandef,
		       enum ieee80211_chanctx_mode mode)
{
	struct ieee80211_chanctx *ctx;

	lockdep_assert_held(&local->chanctx_mtx);

	if (mode == IEEE80211_CHANCTX_EXCLUSIVE)
		return NULL;

	list_for_each_entry(ctx, &local->chanctx_list, list) {
		const struct cfg80211_chan_def *compat;

		if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE)
			continue;

		compat = cfg80211_chandef_compatible(&ctx->conf.def, chandef);
		if (!compat)
			continue;

		ieee80211_change_chandef(local, ctx, compat);

		return ctx;
	}

	return NULL;
}

static struct ieee80211_chanctx *
ieee80211_new_chanctx(struct ieee80211_local *local,
		      const struct cfg80211_chan_def *chandef,
		      enum ieee80211_chanctx_mode mode)
{
	struct ieee80211_chanctx *ctx;
	int err;

	lockdep_assert_held(&local->chanctx_mtx);

	ctx = kzalloc(sizeof(*ctx) + local->hw.chanctx_data_size, GFP_KERNEL);
	if (!ctx)
		return ERR_PTR(-ENOMEM);

	ctx->conf.def = *chandef;
	ctx->conf.rx_chains_static = 1;
	ctx->conf.rx_chains_dynamic = 1;
	ctx->mode = mode;

	if (!local->use_chanctx) {
		local->_oper_channel_type =
			cfg80211_get_chandef_type(chandef);
		local->_oper_channel = chandef->chan;
		ieee80211_hw_config(local, 0);
	} else {
		err = drv_add_chanctx(local, ctx);
		if (err) {
			kfree(ctx);
			return ERR_PTR(err);
		}
	}

	list_add_rcu(&ctx->list, &local->chanctx_list);

	mutex_lock(&local->mtx);
	ieee80211_recalc_idle(local);
	mutex_unlock(&local->mtx);

	return ctx;
}

static void ieee80211_free_chanctx(struct ieee80211_local *local,
				   struct ieee80211_chanctx *ctx)
{
	lockdep_assert_held(&local->chanctx_mtx);

	WARN_ON_ONCE(ctx->refcount != 0);

	if (!local->use_chanctx) {
		local->_oper_channel_type = NL80211_CHAN_NO_HT;
		ieee80211_hw_config(local, 0);
	} else {
		drv_remove_chanctx(local, ctx);
	}

	list_del_rcu(&ctx->list);
	kfree_rcu(ctx, rcu_head);

	mutex_lock(&local->mtx);
	ieee80211_recalc_idle(local);
	mutex_unlock(&local->mtx);
}

static int ieee80211_assign_vif_chanctx(struct ieee80211_sub_if_data *sdata,
					struct ieee80211_chanctx *ctx)
{
	struct ieee80211_local *local = sdata->local;
	int ret;

	lockdep_assert_held(&local->chanctx_mtx);

	ret = drv_assign_vif_chanctx(local, sdata, ctx);
	if (ret)
		return ret;

	rcu_assign_pointer(sdata->vif.chanctx_conf, &ctx->conf);
	ctx->refcount++;

	ieee80211_recalc_txpower(sdata);
	sdata->vif.bss_conf.idle = false;
	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE);

	return 0;
}

static void ieee80211_recalc_chanctx_chantype(struct ieee80211_local *local,
					      struct ieee80211_chanctx *ctx)
{
	struct ieee80211_chanctx_conf *conf = &ctx->conf;
	struct ieee80211_sub_if_data *sdata;
	const struct cfg80211_chan_def *compat = NULL;

	lockdep_assert_held(&local->chanctx_mtx);

	rcu_read_lock();
	list_for_each_entry_rcu(sdata, &local->interfaces, list) {

		if (!ieee80211_sdata_running(sdata))
			continue;
		if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf)
			continue;

		if (!compat)
			compat = &sdata->vif.bss_conf.chandef;

		compat = cfg80211_chandef_compatible(
				&sdata->vif.bss_conf.chandef, compat);
		if (!compat)
			break;
	}
	rcu_read_unlock();

	if (WARN_ON_ONCE(!compat))
		return;

	ieee80211_change_chandef(local, ctx, compat);
}

static void ieee80211_unassign_vif_chanctx(struct ieee80211_sub_if_data *sdata,
					   struct ieee80211_chanctx *ctx)
{
	struct ieee80211_local *local = sdata->local;

	lockdep_assert_held(&local->chanctx_mtx);

	ctx->refcount--;
	rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);

	sdata->vif.bss_conf.idle = true;
	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE);

	drv_unassign_vif_chanctx(local, sdata, ctx);

	if (ctx->refcount > 0) {
		ieee80211_recalc_chanctx_chantype(sdata->local, ctx);
		ieee80211_recalc_smps_chanctx(local, ctx);
		ieee80211_recalc_radar_chanctx(local, ctx);
	}
}

static void __ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_chanctx_conf *conf;
	struct ieee80211_chanctx *ctx;

	lockdep_assert_held(&local->chanctx_mtx);

	conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
					 lockdep_is_held(&local->chanctx_mtx));
	if (!conf)
		return;

	ctx = container_of(conf, struct ieee80211_chanctx, conf);

	ieee80211_unassign_vif_chanctx(sdata, ctx);
	if (ctx->refcount == 0)
		ieee80211_free_chanctx(local, ctx);
}

void ieee80211_recalc_radar_chanctx(struct ieee80211_local *local,
				    struct ieee80211_chanctx *chanctx)
{
	struct ieee80211_sub_if_data *sdata;
	bool radar_enabled = false;

	lockdep_assert_held(&local->chanctx_mtx);

	rcu_read_lock();
	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
		if (sdata->radar_required) {
			radar_enabled = true;
			break;
		}
	}
	rcu_read_unlock();

	if (radar_enabled == chanctx->conf.radar_enabled)
		return;

	chanctx->conf.radar_enabled = radar_enabled;
	local->radar_detect_enabled = chanctx->conf.radar_enabled;

	if (!local->use_chanctx) {
		local->hw.conf.radar_enabled = chanctx->conf.radar_enabled;
		ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
	}

	drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RADAR);
}

void ieee80211_recalc_smps_chanctx(struct ieee80211_local *local,
				   struct ieee80211_chanctx *chanctx)
{
	struct ieee80211_sub_if_data *sdata;
	u8 rx_chains_static, rx_chains_dynamic;

	lockdep_assert_held(&local->chanctx_mtx);

	rx_chains_static = 1;
	rx_chains_dynamic = 1;

	rcu_read_lock();
	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
		u8 needed_static, needed_dynamic;

		if (!ieee80211_sdata_running(sdata))
			continue;

		if (rcu_access_pointer(sdata->vif.chanctx_conf) !=
						&chanctx->conf)
			continue;

		switch (sdata->vif.type) {
		case NL80211_IFTYPE_P2P_DEVICE:
			continue;
		case NL80211_IFTYPE_STATION:
			if (!sdata->u.mgd.associated)
				continue;
			break;
		case NL80211_IFTYPE_AP_VLAN:
			continue;
		case NL80211_IFTYPE_AP:
		case NL80211_IFTYPE_ADHOC:
		case NL80211_IFTYPE_WDS:
		case NL80211_IFTYPE_MESH_POINT:
			break;
		default:
			WARN_ON_ONCE(1);
		}

		switch (sdata->smps_mode) {
		default:
			WARN_ONCE(1, "Invalid SMPS mode %d\n",
				  sdata->smps_mode);
			/* fall through */
		case IEEE80211_SMPS_OFF:
			needed_static = sdata->needed_rx_chains;
			needed_dynamic = sdata->needed_rx_chains;
			break;
		case IEEE80211_SMPS_DYNAMIC:
			needed_static = 1;
			needed_dynamic = sdata->needed_rx_chains;
			break;
		case IEEE80211_SMPS_STATIC:
			needed_static = 1;
			needed_dynamic = 1;
			break;
		}

		rx_chains_static = max(rx_chains_static, needed_static);
		rx_chains_dynamic = max(rx_chains_dynamic, needed_dynamic);
	}
	rcu_read_unlock();

	if (!local->use_chanctx) {
		if (rx_chains_static > 1)
			local->smps_mode = IEEE80211_SMPS_OFF;
		else if (rx_chains_dynamic > 1)
			local->smps_mode = IEEE80211_SMPS_DYNAMIC;
		else
			local->smps_mode = IEEE80211_SMPS_STATIC;
		ieee80211_hw_config(local, 0);
	}

	if (rx_chains_static == chanctx->conf.rx_chains_static &&
	    rx_chains_dynamic == chanctx->conf.rx_chains_dynamic)
		return;

	chanctx->conf.rx_chains_static = rx_chains_static;
	chanctx->conf.rx_chains_dynamic = rx_chains_dynamic;
	drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RX_CHAINS);
}

int ieee80211_vif_use_channel(struct ieee80211_sub_if_data *sdata,
			      const struct cfg80211_chan_def *chandef,
			      enum ieee80211_chanctx_mode mode)
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_chanctx *ctx;
	int ret;

	WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));

	mutex_lock(&local->chanctx_mtx);
	__ieee80211_vif_release_channel(sdata);

	ctx = ieee80211_find_chanctx(local, chandef, mode);
	if (!ctx)
		ctx = ieee80211_new_chanctx(local, chandef, mode);
	if (IS_ERR(ctx)) {
		ret = PTR_ERR(ctx);
		goto out;
	}

	sdata->vif.bss_conf.chandef = *chandef;

	ret = ieee80211_assign_vif_chanctx(sdata, ctx);
	if (ret) {
		/* if assign fails refcount stays the same */
		if (ctx->refcount == 0)
			ieee80211_free_chanctx(local, ctx);
		goto out;
	}

	ieee80211_recalc_smps_chanctx(local, ctx);
	ieee80211_recalc_radar_chanctx(local, ctx);
 out:
	mutex_unlock(&local->chanctx_mtx);
	return ret;
}

void ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
{
	WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));

	mutex_lock(&sdata->local->chanctx_mtx);
	__ieee80211_vif_release_channel(sdata);
	mutex_unlock(&sdata->local->chanctx_mtx);
}

void ieee80211_vif_vlan_copy_chanctx(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_sub_if_data *ap;
	struct ieee80211_chanctx_conf *conf;

	if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->bss))
		return;

	ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);

	mutex_lock(&local->chanctx_mtx);

	conf = rcu_dereference_protected(ap->vif.chanctx_conf,
					 lockdep_is_held(&local->chanctx_mtx));
	rcu_assign_pointer(sdata->vif.chanctx_conf, conf);
	mutex_unlock(&local->chanctx_mtx);
}

void ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata,
					 bool clear)
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_sub_if_data *vlan;
	struct ieee80211_chanctx_conf *conf;

	ASSERT_RTNL();

	if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP))
		return;

	mutex_lock(&local->chanctx_mtx);

	/*
	 * Check that conf exists, even when clearing this function
	 * must be called with the AP's channel context still there
	 * as it would otherwise cause VLANs to have an invalid
	 * channel context pointer for a while, possibly pointing
	 * to a channel context that has already been freed.
	 */
	conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
				lockdep_is_held(&local->chanctx_mtx));
	WARN_ON(!conf);

	if (clear)
		conf = NULL;

	list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
		rcu_assign_pointer(vlan->vif.chanctx_conf, conf);

	mutex_unlock(&local->chanctx_mtx);
}

void ieee80211_iter_chan_contexts_atomic(
	struct ieee80211_hw *hw,
	void (*iter)(struct ieee80211_hw *hw,
		     struct ieee80211_chanctx_conf *chanctx_conf,
		     void *data),
	void *iter_data)
{
	struct ieee80211_local *local = hw_to_local(hw);
	struct ieee80211_chanctx *ctx;

	rcu_read_lock();
	list_for_each_entry_rcu(ctx, &local->chanctx_list, list)
		if (ctx->driver_present)
			iter(hw, &ctx->conf, iter_data);
	rcu_read_unlock();
}
EXPORT_SYMBOL_GPL(ieee80211_iter_chan_contexts_atomic);
Commit	Line	Data
f444de05 JB	1	/*
	2	* mac80211 - channel management
	3	*/
	4
0aaffa9b	5	#include <linux/nl80211.h>
3448c005	6	#include <linux/export.h>
4d76d21b	7	#include <linux/rtnetlink.h>
3117bbdb	8	#include <net/cfg80211.h>
f444de05	9	#include "ieee80211_i.h"
35f2fce9	10	#include "driver-ops.h"
f444de05	11
4bf88530 JB	12	static void ieee80211_change_chandef(struct ieee80211_local *local,
	13	struct ieee80211_chanctx *ctx,
	14	const struct cfg80211_chan_def *chandef)
23a85b45	15	{
4bf88530	16	if (cfg80211_chandef_identical(&ctx->conf.def, chandef))
e89a96f5	17	return;
0aaffa9b	18
4bf88530 JB	19	WARN_ON(!cfg80211_chandef_compatible(&ctx->conf.def, chandef));
	20
	21	ctx->conf.def = *chandef;
	22	drv_change_chanctx(local, ctx, IEEE80211_CHANCTX_CHANGE_WIDTH);
55de908a JB	23
55de908a JB	24	if (!local->use_chanctx) {
4bf88530	25	local->_oper_channel_type = cfg80211_get_chandef_type(chandef);
55de908a JB	26	ieee80211_hw_config(local, 0);
55de908a JB	27	}
0aaffa9b	28	}
d01a1e65 MK	29
	30	static struct ieee80211_chanctx *
	31	ieee80211_find_chanctx(struct ieee80211_local *local,
4bf88530	32	const struct cfg80211_chan_def *chandef,
d01a1e65 MK	33	enum ieee80211_chanctx_mode mode)
	34	{
	35	struct ieee80211_chanctx *ctx;
	36
	37	lockdep_assert_held(&local->chanctx_mtx);
	38
	39	if (mode == IEEE80211_CHANCTX_EXCLUSIVE)
	40	return NULL;
d01a1e65 MK	41
d01a1e65 MK	42	list_for_each_entry(ctx, &local->chanctx_list, list) {
4bf88530	43	const struct cfg80211_chan_def *compat;
e89a96f5	44
d01a1e65 MK	45	if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE)
d01a1e65 MK	46	continue;
4bf88530 JB	47
	48	compat = cfg80211_chandef_compatible(&ctx->conf.def, chandef);
	49	if (!compat)
d01a1e65 MK	50	continue;
d01a1e65 MK	51
4bf88530	52	ieee80211_change_chandef(local, ctx, compat);
e89a96f5	53
d01a1e65 MK	54	return ctx;
	55	}
	56
	57	return NULL;
	58	}
	59
	60	static struct ieee80211_chanctx *
	61	ieee80211_new_chanctx(struct ieee80211_local *local,
4bf88530	62	const struct cfg80211_chan_def *chandef,
d01a1e65 MK	63	enum ieee80211_chanctx_mode mode)
	64	{
	65	struct ieee80211_chanctx *ctx;
35f2fce9	66	int err;
d01a1e65 MK	67
	68	lockdep_assert_held(&local->chanctx_mtx);
	69
	70	ctx = kzalloc(sizeof(*ctx) + local->hw.chanctx_data_size, GFP_KERNEL);
	71	if (!ctx)
	72	return ERR_PTR(-ENOMEM);
	73
4bf88530	74	ctx->conf.def = *chandef;
04ecd257 JB	75	ctx->conf.rx_chains_static = 1;
04ecd257 JB	76	ctx->conf.rx_chains_dynamic = 1;
d01a1e65 MK	77	ctx->mode = mode;
d01a1e65 MK	78
55de908a	79	if (!local->use_chanctx) {
4bf88530 JB	80	local->_oper_channel_type =
	81	cfg80211_get_chandef_type(chandef);
	82	local->_oper_channel = chandef->chan;
55de908a JB	83	ieee80211_hw_config(local, 0);
	84	} else {
	85	err = drv_add_chanctx(local, ctx);
	86	if (err) {
	87	kfree(ctx);
	88	return ERR_PTR(err);
	89	}
35f2fce9 MK	90	}
35f2fce9 MK	91
3448c005	92	list_add_rcu(&ctx->list, &local->chanctx_list);
d01a1e65	93
fd0f979a JB	94	mutex_lock(&local->mtx);
	95	ieee80211_recalc_idle(local);
	96	mutex_unlock(&local->mtx);
	97
d01a1e65 MK	98	return ctx;
	99	}
	100
	101	static void ieee80211_free_chanctx(struct ieee80211_local *local,
	102	struct ieee80211_chanctx *ctx)
	103	{
	104	lockdep_assert_held(&local->chanctx_mtx);
	105
	106	WARN_ON_ONCE(ctx->refcount != 0);
	107
55de908a JB	108	if (!local->use_chanctx) {
	109	local->_oper_channel_type = NL80211_CHAN_NO_HT;
	110	ieee80211_hw_config(local, 0);
	111	} else {
	112	drv_remove_chanctx(local, ctx);
	113	}
35f2fce9	114
3448c005	115	list_del_rcu(&ctx->list);
d01a1e65	116	kfree_rcu(ctx, rcu_head);
fd0f979a JB	117
	118	mutex_lock(&local->mtx);
	119	ieee80211_recalc_idle(local);
	120	mutex_unlock(&local->mtx);
d01a1e65 MK	121	}
	122
	123	static int ieee80211_assign_vif_chanctx(struct ieee80211_sub_if_data *sdata,
	124	struct ieee80211_chanctx *ctx)
	125	{
35f2fce9 MK	126	struct ieee80211_local *local = sdata->local;
35f2fce9 MK	127	int ret;
d01a1e65 MK	128
	129	lockdep_assert_held(&local->chanctx_mtx);
	130
35f2fce9 MK	131	ret = drv_assign_vif_chanctx(local, sdata, ctx);
	132	if (ret)
	133	return ret;
	134
d01a1e65 MK	135	rcu_assign_pointer(sdata->vif.chanctx_conf, &ctx->conf);
	136	ctx->refcount++;
	137
1ea6f9c0	138	ieee80211_recalc_txpower(sdata);
fd0f979a JB	139	sdata->vif.bss_conf.idle = false;
fd0f979a JB	140	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE);
1ea6f9c0	141
d01a1e65 MK	142	return 0;
	143	}
	144
4bf88530 JB	145	static void ieee80211_recalc_chanctx_chantype(struct ieee80211_local *local,
4bf88530 JB	146	struct ieee80211_chanctx *ctx)
e89a96f5 MK	147	{
	148	struct ieee80211_chanctx_conf *conf = &ctx->conf;
	149	struct ieee80211_sub_if_data *sdata;
4bf88530	150	const struct cfg80211_chan_def *compat = NULL;
e89a96f5 MK	151
	152	lockdep_assert_held(&local->chanctx_mtx);
	153
	154	rcu_read_lock();
	155	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
4bf88530	156
e89a96f5 MK	157	if (!ieee80211_sdata_running(sdata))
	158	continue;
	159	if (rcu_access_pointer(sdata->vif.chanctx_conf) != conf)
	160	continue;
	161
4bf88530 JB	162	if (!compat)
	163	compat = &sdata->vif.bss_conf.chandef;
	164
	165	compat = cfg80211_chandef_compatible(
	166	&sdata->vif.bss_conf.chandef, compat);
	167	if (!compat)
	168	break;
e89a96f5 MK	169	}
	170	rcu_read_unlock();
	171
4bf88530 JB	172	if (WARN_ON_ONCE(!compat))
4bf88530 JB	173	return;
e89a96f5	174
4bf88530	175	ieee80211_change_chandef(local, ctx, compat);
e89a96f5 MK	176	}
e89a96f5 MK	177
d01a1e65 MK	178	static void ieee80211_unassign_vif_chanctx(struct ieee80211_sub_if_data *sdata,
	179	struct ieee80211_chanctx *ctx)
	180	{
35f2fce9	181	struct ieee80211_local *local = sdata->local;
d01a1e65 MK	182
	183	lockdep_assert_held(&local->chanctx_mtx);
	184
	185	ctx->refcount--;
	186	rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
35f2fce9	187
fd0f979a JB	188	sdata->vif.bss_conf.idle = true;
	189	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE);
	190
35f2fce9	191	drv_unassign_vif_chanctx(local, sdata, ctx);
e89a96f5	192
04ecd257	193	if (ctx->refcount > 0) {
e89a96f5	194	ieee80211_recalc_chanctx_chantype(sdata->local, ctx);
04ecd257	195	ieee80211_recalc_smps_chanctx(local, ctx);
164eb02d	196	ieee80211_recalc_radar_chanctx(local, ctx);
04ecd257	197	}
d01a1e65 MK	198	}
	199
	200	static void __ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
	201	{
	202	struct ieee80211_local *local = sdata->local;
	203	struct ieee80211_chanctx_conf *conf;
	204	struct ieee80211_chanctx *ctx;
	205
	206	lockdep_assert_held(&local->chanctx_mtx);
	207
	208	conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
	209	lockdep_is_held(&local->chanctx_mtx));
	210	if (!conf)
	211	return;
	212
	213	ctx = container_of(conf, struct ieee80211_chanctx, conf);
	214
	215	ieee80211_unassign_vif_chanctx(sdata, ctx);
	216	if (ctx->refcount == 0)
	217	ieee80211_free_chanctx(local, ctx);
	218	}
	219
164eb02d SW	220	void ieee80211_recalc_radar_chanctx(struct ieee80211_local *local,
	221	struct ieee80211_chanctx *chanctx)
	222	{
	223	struct ieee80211_sub_if_data *sdata;
	224	bool radar_enabled = false;
	225
	226	lockdep_assert_held(&local->chanctx_mtx);
	227
	228	rcu_read_lock();
	229	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
	230	if (sdata->radar_required) {
	231	radar_enabled = true;
	232	break;
	233	}
	234	}
	235	rcu_read_unlock();
	236
	237	if (radar_enabled == chanctx->conf.radar_enabled)
	238	return;
	239
	240	chanctx->conf.radar_enabled = radar_enabled;
	241	local->radar_detect_enabled = chanctx->conf.radar_enabled;
	242
	243	if (!local->use_chanctx) {
	244	local->hw.conf.radar_enabled = chanctx->conf.radar_enabled;
	245	ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
	246	}
	247
	248	drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RADAR);
	249	}
	250
04ecd257 JB	251	void ieee80211_recalc_smps_chanctx(struct ieee80211_local *local,
	252	struct ieee80211_chanctx *chanctx)
	253	{
	254	struct ieee80211_sub_if_data *sdata;
	255	u8 rx_chains_static, rx_chains_dynamic;
	256
	257	lockdep_assert_held(&local->chanctx_mtx);
	258
	259	rx_chains_static = 1;
	260	rx_chains_dynamic = 1;
	261
	262	rcu_read_lock();
	263	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
	264	u8 needed_static, needed_dynamic;
	265
	266	if (!ieee80211_sdata_running(sdata))
	267	continue;
	268
	269	if (rcu_access_pointer(sdata->vif.chanctx_conf) !=
	270	&chanctx->conf)
	271	continue;
	272
	273	switch (sdata->vif.type) {
	274	case NL80211_IFTYPE_P2P_DEVICE:
	275	continue;
	276	case NL80211_IFTYPE_STATION:
	277	if (!sdata->u.mgd.associated)
	278	continue;
	279	break;
	280	case NL80211_IFTYPE_AP_VLAN:
	281	continue;
	282	case NL80211_IFTYPE_AP:
	283	case NL80211_IFTYPE_ADHOC:
	284	case NL80211_IFTYPE_WDS:
	285	case NL80211_IFTYPE_MESH_POINT:
	286	break;
	287	default:
	288	WARN_ON_ONCE(1);
	289	}
	290
	291	switch (sdata->smps_mode) {
	292	default:
	293	WARN_ONCE(1, "Invalid SMPS mode %d\n",
	294	sdata->smps_mode);
	295	/* fall through */
	296	case IEEE80211_SMPS_OFF:
	297	needed_static = sdata->needed_rx_chains;
	298	needed_dynamic = sdata->needed_rx_chains;
	299	break;
	300	case IEEE80211_SMPS_DYNAMIC:
	301	needed_static = 1;
	302	needed_dynamic = sdata->needed_rx_chains;
	303	break;
	304	case IEEE80211_SMPS_STATIC:
	305	needed_static = 1;
	306	needed_dynamic = 1;
	307	break;
	308	}
	309
	310	rx_chains_static = max(rx_chains_static, needed_static);
	311	rx_chains_dynamic = max(rx_chains_dynamic, needed_dynamic);
	312	}
	313	rcu_read_unlock();
	314
315	if (!local->use_chanctx) {
316	if (rx_chains_static > 1)
317	local->smps_mode = IEEE80211_SMPS_OFF;
318	else if (rx_chains_dynamic > 1)
319	local->smps_mode = IEEE80211_SMPS_DYNAMIC;
320	else
321	local->smps_mode = IEEE80211_SMPS_STATIC;
322	ieee80211_hw_config(local, 0);
323	}
324
325	if (rx_chains_static == chanctx->conf.rx_chains_static &&
326	rx_chains_dynamic == chanctx->conf.rx_chains_dynamic)
327	return;
328
329	chanctx->conf.rx_chains_static = rx_chains_static;
330	chanctx->conf.rx_chains_dynamic = rx_chains_dynamic;
331	drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RX_CHAINS);
332	}
333
d01a1e65	334	int ieee80211_vif_use_channel(struct ieee80211_sub_if_data *sdata,
4bf88530	335	const struct cfg80211_chan_def *chandef,
d01a1e65 MK	336	enum ieee80211_chanctx_mode mode)
	337	{
	338	struct ieee80211_local *local = sdata->local;
	339	struct ieee80211_chanctx *ctx;
	340	int ret;
	341
55de908a JB	342	WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));
55de908a JB	343
d01a1e65 MK	344	mutex_lock(&local->chanctx_mtx);
	345	__ieee80211_vif_release_channel(sdata);
	346
4bf88530	347	ctx = ieee80211_find_chanctx(local, chandef, mode);
d01a1e65	348	if (!ctx)
4bf88530	349	ctx = ieee80211_new_chanctx(local, chandef, mode);
d01a1e65 MK	350	if (IS_ERR(ctx)) {
	351	ret = PTR_ERR(ctx);
	352	goto out;
	353	}
	354
4bf88530	355	sdata->vif.bss_conf.chandef = *chandef;
55de908a	356
d01a1e65 MK	357	ret = ieee80211_assign_vif_chanctx(sdata, ctx);
	358	if (ret) {
	359	/* if assign fails refcount stays the same */
	360	if (ctx->refcount == 0)
	361	ieee80211_free_chanctx(local, ctx);
	362	goto out;
	363	}
	364
04ecd257	365	ieee80211_recalc_smps_chanctx(local, ctx);
164eb02d	366	ieee80211_recalc_radar_chanctx(local, ctx);
d01a1e65 MK	367	out:
	368	mutex_unlock(&local->chanctx_mtx);
	369	return ret;
	370	}
	371
	372	void ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
	373	{
55de908a JB	374	WARN_ON(sdata->dev && netif_carrier_ok(sdata->dev));
55de908a JB	375
d01a1e65 MK	376	mutex_lock(&sdata->local->chanctx_mtx);
	377	__ieee80211_vif_release_channel(sdata);
	378	mutex_unlock(&sdata->local->chanctx_mtx);
	379	}
3448c005	380
4d76d21b JB	381	void ieee80211_vif_vlan_copy_chanctx(struct ieee80211_sub_if_data *sdata)
	382	{
	383	struct ieee80211_local *local = sdata->local;
	384	struct ieee80211_sub_if_data *ap;
	385	struct ieee80211_chanctx_conf *conf;
	386
	387	if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN \|\| !sdata->bss))
	388	return;
	389
	390	ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
	391
	392	mutex_lock(&local->chanctx_mtx);
	393
	394	conf = rcu_dereference_protected(ap->vif.chanctx_conf,
	395	lockdep_is_held(&local->chanctx_mtx));
	396	rcu_assign_pointer(sdata->vif.chanctx_conf, conf);
	397	mutex_unlock(&local->chanctx_mtx);
	398	}
	399
1f4ac5a6 JB	400	void ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata,
	401	bool clear)
	402	{
	403	struct ieee80211_local *local = sdata->local;
	404	struct ieee80211_sub_if_data *vlan;
	405	struct ieee80211_chanctx_conf *conf;
	406
	407	ASSERT_RTNL();
	408
	409	if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP))
	410	return;
	411
	412	mutex_lock(&local->chanctx_mtx);
	413
	414	/*
	415	* Check that conf exists, even when clearing this function
	416	* must be called with the AP's channel context still there
	417	* as it would otherwise cause VLANs to have an invalid
	418	* channel context pointer for a while, possibly pointing
	419	* to a channel context that has already been freed.
	420	*/
	421	conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
	422	lockdep_is_held(&local->chanctx_mtx));
	423	WARN_ON(!conf);
	424
	425	if (clear)
	426	conf = NULL;
	427
	428	list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
	429	rcu_assign_pointer(vlan->vif.chanctx_conf, conf);
	430
	431	mutex_unlock(&local->chanctx_mtx);
	432	}
	433
3448c005 JB	434	void ieee80211_iter_chan_contexts_atomic(
	435	struct ieee80211_hw *hw,
	436	void (iter)(struct ieee80211_hw hw,
	437	struct ieee80211_chanctx_conf *chanctx_conf,
	438	void *data),
	439	void *iter_data)
	440	{
	441	struct ieee80211_local *local = hw_to_local(hw);
	442	struct ieee80211_chanctx *ctx;
	443
	444	rcu_read_lock();
	445	list_for_each_entry_rcu(ctx, &local->chanctx_list, list)
8a61af65 JB	446	if (ctx->driver_present)
8a61af65 JB	447	iter(hw, &ctx->conf, iter_data);
3448c005 JB	448	rcu_read_unlock();
	449	}
	450	EXPORT_SYMBOL_GPL(ieee80211_iter_chan_contexts_atomic);