mac80211: introduce channel context skeleton code
Channel context are the foundation for multi-channel
operation. They are are immutable and are re-created
(or re-used if other interfaces are bound to a certain
channel and a compatible channel type) on channel
switching.
This is an initial implementation and more features
will come in separate patches.
Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
[some changes including RCU protection]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 8c80455..9a058e58d 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -658,6 +658,30 @@
SDATA_STATE_OFFCHANNEL,
};
+/**
+ * enum ieee80211_chanctx_mode - channel context configuration mode
+ *
+ * @IEEE80211_CHANCTX_SHARED: channel context may be used by
+ * multiple interfaces
+ * @IEEE80211_CHANCTX_EXCLUSIVE: channel context can be used
+ * only by a single interface. This can be used for example for
+ * non-fixed channel IBSS.
+ */
+enum ieee80211_chanctx_mode {
+ IEEE80211_CHANCTX_SHARED,
+ IEEE80211_CHANCTX_EXCLUSIVE
+};
+
+struct ieee80211_chanctx {
+ struct list_head list;
+ struct rcu_head rcu_head;
+
+ enum ieee80211_chanctx_mode mode;
+ int refcount;
+
+ struct ieee80211_chanctx_conf conf;
+};
+
struct ieee80211_sub_if_data {
struct list_head list;
@@ -987,6 +1011,10 @@
struct ieee80211_channel *tmp_channel;
enum nl80211_channel_type tmp_channel_type;
+ /* channel contexts */
+ struct list_head chanctx_list;
+ struct mutex chanctx_mtx;
+
/* SNMP counters */
/* dot11CountersTable */
u32 dot11TransmittedFragmentCount;
@@ -1510,6 +1538,13 @@
enum nl80211_channel_type
ieee80211_ht_oper_to_channel_type(struct ieee80211_ht_operation *ht_oper);
+int __must_check
+ieee80211_vif_use_channel(struct ieee80211_sub_if_data *sdata,
+ struct ieee80211_channel *channel,
+ enum nl80211_channel_type channel_type,
+ enum ieee80211_chanctx_mode mode);
+void ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata);
+
#ifdef CONFIG_MAC80211_NOINLINE
#define debug_noinline noinline
#else