mac80211: update adjusting TBTT bit in beacon
This regression was introduced in "mac80211: cache mesh
beacon".
mesh_sync_offset_adjust_tbtt() was assuming that the
beacon would be rebuilt in every single pre-tbtt
interrupt, but now the beacon update happens on the
workqueue, and it must be ready for immediate delivery to
the driver.
Save a pointer to the meshconf IE in the beacon_data (this
works because both the IE pointer and beacon buffer are
protected by the same rcu_{dereference,assign_pointer}())
for quick updates during pre-tbtt. This is faster and a
little prettier than iterating over the elements to find
the meshconf IE every time.
Signed-off-by: Thomas Pedersen <thomas@cozybit.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index ee13c65..adbff71 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -232,6 +232,7 @@
struct beacon_data {
u8 *head, *tail;
int head_len, tail_len;
+ struct ieee80211_meshconf_ie *meshconf;
struct rcu_head rcu_head;
};
@@ -540,7 +541,10 @@
struct ieee80211_mgmt *mgmt,
struct ieee802_11_elems *elems,
struct ieee80211_rx_status *rx_status);
- void (*adjust_tbtt)(struct ieee80211_sub_if_data *sdata);
+
+ /* should be called with beacon_data under RCU read lock */
+ void (*adjust_tbtt)(struct ieee80211_sub_if_data *sdata,
+ struct beacon_data *beacon);
/* add other framework functions here */
};
@@ -614,6 +618,9 @@
bool chsw_init;
u8 chsw_ttl;
u16 pre_value;
+
+ /* offset from skb->data while building IE */
+ int meshconf_offset;
};
#ifdef CONFIG_MAC80211_MESH