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mac80211: add api to set CSA counter in mac80211 

Sometimes the most updated CSA counter values are known only
to the device. Add an API to pass this data to mac80211.

Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Gregory Greenman 2018-04-20 13:49:24 +03:00 committed by Johannes Berg
parent a403f3bf63
commit 03737001e4
2 changed files with 38 additions and 0 deletions
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13
include/net/mac80211.h
View File

@ -4449,6 +4449,19 @@ static inline struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw,
*/
u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif);
/**
* ieee80211_csa_set_counter - request mac80211 to set csa counter
* @vif: &struct ieee80211_vif pointer from the add_interface callback.
* @counter: the new value for the counter
*
* The csa counter can be changed by the device, this API should be
* used by the device driver to update csa counter in mac80211.
*
* It should never be used together with ieee80211_csa_update_counter(),
* as it will cause a race condition around the counter value.
*/
void ieee80211_csa_set_counter(struct ieee80211_vif *vif, u8 counter);
/**
* ieee80211_csa_finish - notify mac80211 about channel switch
* @vif: &struct ieee80211_vif pointer from the add_interface callback.

25
net/mac80211/tx.c
View File

@ -4084,6 +4084,31 @@ unlock:
}
EXPORT_SYMBOL(ieee80211_csa_update_counter);
void ieee80211_csa_set_counter(struct ieee80211_vif *vif, u8 counter)
{
struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
struct beacon_data *beacon = NULL;
rcu_read_lock();
if (sdata->vif.type == NL80211_IFTYPE_AP)
beacon = rcu_dereference(sdata->u.ap.beacon);
else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
beacon = rcu_dereference(sdata->u.ibss.presp);
else if (ieee80211_vif_is_mesh(&sdata->vif))
beacon = rcu_dereference(sdata->u.mesh.beacon);
if (!beacon)
goto unlock;
if (counter < beacon->csa_current_counter)
beacon->csa_current_counter = counter;
unlock:
rcu_read_unlock();
}
EXPORT_SYMBOL(ieee80211_csa_set_counter);
bool ieee80211_csa_is_complete(struct ieee80211_vif *vif)
{
struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);