Commit 6fa001bc authored by Michal Kazior's avatar Michal Kazior Committed by Johannes Berg
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mac80211: add max channel calculation utility function 



The utility function has no uses yet. It is aimed
at future chanctx reservation management and
channel switching.

Signed-off-by: default avatarMichal Kazior <michal.kazior@tieto.com>
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent 65a124dd

net/mac80211/ieee80211_i.h

+1 −0
Original line number Diff line number Diff line
@@ -1822,6 +1822,7 @@ int ieee80211_check_combinations(struct ieee80211_sub_if_data *sdata, 
				 const struct cfg80211_chan_def *chandef,

				 enum ieee80211_chanctx_mode chanmode,

				 u8 radar_detect);

int ieee80211_max_num_channels(struct ieee80211_local *local);



#ifdef CONFIG_MAC80211_NOINLINE

#define debug_noinline noinline

net/mac80211/util.c

+42 −0
Original line number Diff line number Diff line
@@ -2873,3 +2873,45 @@ int ieee80211_check_combinations(struct ieee80211_sub_if_data *sdata, 
					   num_different_channels,

					   radar_detect, num);

}



static void

ieee80211_iter_max_chans(const struct ieee80211_iface_combination *c,

			 void *data)

{

	u32 *max_num_different_channels = data;



	*max_num_different_channels = max(*max_num_different_channels,

					  c->num_different_channels);

}



int ieee80211_max_num_channels(struct ieee80211_local *local)

{

	struct ieee80211_sub_if_data *sdata;

	int num[NUM_NL80211_IFTYPES] = {};

	struct ieee80211_chanctx *ctx;

	int num_different_channels = 0;

	u8 radar_detect = 0;

	u32 max_num_different_channels = 1;

	int err;



	lockdep_assert_held(&local->chanctx_mtx);



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

		num_different_channels++;



		if (ctx->conf.radar_enabled)

			radar_detect |= BIT(ctx->conf.def.width);

	}



	list_for_each_entry_rcu(sdata, &local->interfaces, list)

		num[sdata->wdev.iftype]++;



	err = cfg80211_iter_combinations(local->hw.wiphy,

					 num_different_channels, radar_detect,

					 num, ieee80211_iter_max_chans,

					 &max_num_different_channels);

	if (err < 0)

		return err;



	return max_num_different_channels;

}