The utility function has no uses yet. It is aimed
at future chanctx reservation management and
channel switching.
Signed-off-by: Michal Kazior <michal.kazior@xxxxxxxxx>
---
net/mac80211/ieee80211_i.h | 1 +
net/mac80211/util.c | 43 +++++++++++++++++++++++++++++++++++++++++++
2 files changed, 44 insertions(+)
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index d3ebe7f..508eecf 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -1814,6 +1814,7 @@ 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
diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index 955b043..7233102 100644
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -2877,3 +2877,46 @@ 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;
+}
--
1.8.5.3
--
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