Commit 0288157b authored by Michal Kazior's avatar Michal Kazior Committed by Johannes Berg
Browse files

mac80211: improve find_chanctx() for reservations 



This allows new vifs to be assigned to a chanctx
as long as chanctx's reservation chandefs (if any)
and chanctx's current chandef (implied by assigned
vifs at the time, if any) and the new vif chandef
are all compatible.

This implies it is impossible to assign a new vif
to an in-place reservation chanctx.

This gives no advantages for single-channel
hardware. It makes sense for multi-channel
hardware only.

Signed-off-by: default avatarMichal Kazior <michal.kazior@tieto.com>
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent e3afb920

net/mac80211/chan.c

+29 −27
Original line number Diff line number Diff line
@@ -28,6 +28,29 @@ static bool ieee80211_can_create_new_chanctx(struct ieee80211_local *local) 
	return ieee80211_num_chanctx(local) < ieee80211_max_num_channels(local);

}



static const struct cfg80211_chan_def *

ieee80211_chanctx_reserved_chandef(struct ieee80211_local *local,

				   struct ieee80211_chanctx *ctx,

				   const struct cfg80211_chan_def *compat)

{

	struct ieee80211_sub_if_data *sdata;



	lockdep_assert_held(&local->chanctx_mtx);



	list_for_each_entry(sdata, &ctx->reserved_vifs,

			    reserved_chanctx_list) {

		if (!compat)

			compat = &sdata->reserved_chandef;



		compat = cfg80211_chandef_compatible(&sdata->reserved_chandef,

						     compat);

		if (!compat)

			break;

	}



	return compat;

}



static enum nl80211_chan_width ieee80211_get_sta_bw(struct ieee80211_sta *sta)

{

	switch (sta->bandwidth) {
@@ -187,27 +210,6 @@ static void ieee80211_change_chanctx(struct ieee80211_local *local, 
	}

}



static bool ieee80211_chanctx_is_reserved(struct ieee80211_local *local,

					  struct ieee80211_chanctx *ctx)

{

	struct ieee80211_sub_if_data *sdata;

	bool ret = false;



	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 (sdata->reserved_chanctx == ctx) {

			ret = true;

			break;

		}

	}



	rcu_read_unlock();

	return ret;

}



static struct ieee80211_chanctx *

ieee80211_find_chanctx(struct ieee80211_local *local,

		       const struct cfg80211_chan_def *chandef,
@@ -223,18 +225,18 @@ ieee80211_find_chanctx(struct ieee80211_local *local, 
	list_for_each_entry(ctx, &local->chanctx_list, list) {

		const struct cfg80211_chan_def *compat;



		/* We don't support chanctx reservation for multiple

		 * vifs yet, so don't allow reserved chanctxs to be

		 * reused.

		 */

		if ((ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE) ||

		    ieee80211_chanctx_is_reserved(local, ctx))

		if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE)

			continue;



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

		if (!compat)

			continue;



		compat = ieee80211_chanctx_reserved_chandef(local, ctx,

							    compat);

		if (!compat)

			continue;



		ieee80211_change_chanctx(local, ctx, compat);



		return ctx;

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