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mac80211: introduce channel context skeleton code

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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>
This commit is contained in:
Michal Kazior
2012-06-26 14:37:16 +02:00
committed by Johannes Berg
parent ddffeb8c4d
commit d01a1e6586
4 changed files with 221 additions and 0 deletions
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35
net/mac80211/ieee80211_i.h
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@@ -658,6 +658,30 @@ enum ieee80211_sdata_state_bits {
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_local {
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 @@ bool ieee80211_set_channel_type(struct ieee80211_local *local,
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