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Commit e89a96f5 authored by Michal Kazior's avatar Michal Kazior Committed by Johannes Berg
Browse files

mac80211: reuse channels for channel contexts 



Reuse channels with compatible channel types. Some
channel types are compatible and can be used
concurrently.

Signed-off-by: default avatarMichal Kazior <michal.kazior@tieto.com>
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent 35f2fce9

net/mac80211/chan.c

+58 −1
Original line number Diff line number Diff line
@@ -167,7 +167,17 @@ bool ieee80211_set_channel_type(struct ieee80211_local *local, 
		sdata->vif.bss_conf.channel_type = chantype;



	return true;

}



static void ieee80211_change_chantype(struct ieee80211_local *local,

				      struct ieee80211_chanctx *ctx,

				      enum nl80211_channel_type chantype)

{

	if (chantype == ctx->conf.channel_type)

		return;



	ctx->conf.channel_type = chantype;

	drv_change_chanctx(local, ctx, IEEE80211_CHANCTX_CHANGE_CHANNEL_TYPE);

}



static struct ieee80211_chanctx *
@@ -177,6 +187,7 @@ ieee80211_find_chanctx(struct ieee80211_local *local, 
		       enum ieee80211_chanctx_mode mode)

{

	struct ieee80211_chanctx *ctx;

	enum nl80211_channel_type compat_type;



	lockdep_assert_held(&local->chanctx_mtx);
@@ -186,13 +197,19 @@ ieee80211_find_chanctx(struct ieee80211_local *local, 
		return NULL;



	list_for_each_entry(ctx, &local->chanctx_list, list) {

		compat_type = ctx->conf.channel_type;



		if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE)

			continue;

		if (ctx->conf.channel != channel)

			continue;

		if (ctx->conf.channel_type != channel_type)

		if (!ieee80211_channel_types_are_compatible(ctx->conf.channel_type,

							    channel_type,

							    &compat_type))

			continue;



		ieee80211_change_chantype(local, ctx, compat_type);



		return ctx;

	}
@@ -260,6 +277,43 @@ static int ieee80211_assign_vif_chanctx(struct ieee80211_sub_if_data *sdata, 
	return 0;

}



static enum nl80211_channel_type

ieee80211_calc_chantype(struct ieee80211_local *local,

			struct ieee80211_chanctx *ctx)

{

	struct ieee80211_chanctx_conf *conf = &ctx->conf;

	struct ieee80211_sub_if_data *sdata;

	enum nl80211_channel_type result = NL80211_CHAN_NO_HT;



	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;



		WARN_ON_ONCE(!ieee80211_channel_types_are_compatible(

					sdata->vif.bss_conf.channel_type,

					result, &result));

	}

	rcu_read_unlock();



	return result;

}



static void ieee80211_recalc_chanctx_chantype(struct ieee80211_local *local,

					      struct ieee80211_chanctx *ctx)

{

	enum nl80211_channel_type chantype;



	lockdep_assert_held(&local->chanctx_mtx);



	chantype = ieee80211_calc_chantype(local, ctx);

	ieee80211_change_chantype(local, ctx, chantype);

}



static void ieee80211_unassign_vif_chanctx(struct ieee80211_sub_if_data *sdata,

					   struct ieee80211_chanctx *ctx)

{
@@ -271,6 +325,9 @@ static void ieee80211_unassign_vif_chanctx(struct ieee80211_sub_if_data *sdata, 
	rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);



	drv_unassign_vif_chanctx(local, sdata, ctx);



	if (ctx->refcount > 0)

		ieee80211_recalc_chanctx_chantype(sdata->local, ctx);

}



static void __ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)