mac80211: delay IBSS station insertion
In order to notify drivers and simplify the station
management code, defer IBSS station insertion to a
work item and don't do it directly while receiving
a frame.
This increases the complexity in IBSS a little bit,
but it's pretty straight forward and it allows us
to reduce the station management complexity (next
patch) considerably.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/mac80211/ibss.c b/net/mac80211/ibss.c
index 47e2db9..f8a32bf 100644
--- a/net/mac80211/ibss.c
+++ b/net/mac80211/ibss.c
@@ -275,6 +275,80 @@
cbss->tsf);
}
+static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
+ __acquires(RCU)
+{
+ struct ieee80211_sub_if_data *sdata = sta->sdata;
+ u8 addr[ETH_ALEN];
+
+ memcpy(addr, sta->sta.addr, ETH_ALEN);
+
+#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
+ wiphy_debug(sdata->local->hw.wiphy,
+ "Adding new IBSS station %pM (dev=%s)\n",
+ addr, sdata->name);
+#endif
+
+ sta_info_move_state(sta, IEEE80211_STA_AUTH);
+ sta_info_move_state(sta, IEEE80211_STA_ASSOC);
+ sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
+
+ rate_control_rate_init(sta);
+
+ /* If it fails, maybe we raced another insertion? */
+ if (sta_info_insert_rcu(sta))
+ return sta_info_get(sdata, addr);
+ return sta;
+}
+
+static struct sta_info *
+ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
+ const u8 *bssid, const u8 *addr,
+ u32 supp_rates)
+ __acquires(RCU)
+{
+ struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
+ struct ieee80211_local *local = sdata->local;
+ struct sta_info *sta;
+ int band = local->hw.conf.channel->band;
+
+ /*
+ * XXX: Consider removing the least recently used entry and
+ * allow new one to be added.
+ */
+ if (local->num_sta >= IEEE80211_IBSS_MAX_STA_ENTRIES) {
+ if (net_ratelimit())
+ printk(KERN_DEBUG "%s: No room for a new IBSS STA entry %pM\n",
+ sdata->name, addr);
+ rcu_read_lock();
+ return NULL;
+ }
+
+ if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH) {
+ rcu_read_lock();
+ return NULL;
+ }
+
+ if (compare_ether_addr(bssid, sdata->u.ibss.bssid)) {
+ rcu_read_lock();
+ return NULL;
+ }
+
+ sta = sta_info_alloc(sdata, addr, GFP_KERNEL);
+ if (!sta) {
+ rcu_read_lock();
+ return NULL;
+ }
+
+ sta->last_rx = jiffies;
+
+ /* make sure mandatory rates are always added */
+ sta->sta.supp_rates[band] = supp_rates |
+ ieee80211_mandatory_rates(local, band);
+
+ return ieee80211_ibss_finish_sta(sta);
+}
+
static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
struct ieee80211_mgmt *mgmt,
size_t len,
@@ -334,10 +408,11 @@
#endif
rates_updated = true;
}
- } else
+ } else {
+ rcu_read_unlock();
sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
- mgmt->sa, supp_rates,
- GFP_ATOMIC);
+ mgmt->sa, supp_rates);
+ }
}
if (sta && elems->wmm_info)
@@ -464,21 +539,17 @@
ieee80211_sta_join_ibss(sdata, bss);
supp_rates = ieee80211_sta_get_rates(local, elems, band);
ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
- supp_rates, GFP_KERNEL);
+ supp_rates);
+ rcu_read_unlock();
}
put_bss:
ieee80211_rx_bss_put(local, bss);
}
-/*
- * Add a new IBSS station, will also be called by the RX code when,
- * in IBSS mode, receiving a frame from a yet-unknown station, hence
- * must be callable in atomic context.
- */
-struct sta_info *ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
- u8 *bssid, u8 *addr, u32 supp_rates,
- gfp_t gfp)
+void ieee80211_ibss_rx_no_sta(struct ieee80211_sub_if_data *sdata,
+ const u8 *bssid, const u8 *addr,
+ u32 supp_rates)
{
struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
struct ieee80211_local *local = sdata->local;
@@ -493,40 +564,29 @@
if (net_ratelimit())
printk(KERN_DEBUG "%s: No room for a new IBSS STA entry %pM\n",
sdata->name, addr);
- return NULL;
+ return;
}
if (ifibss->state == IEEE80211_IBSS_MLME_SEARCH)
- return NULL;
+ return;
if (compare_ether_addr(bssid, sdata->u.ibss.bssid))
- return NULL;
+ return;
-#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
- wiphy_debug(local->hw.wiphy, "Adding new IBSS station %pM (dev=%s)\n",
- addr, sdata->name);
-#endif
-
- sta = sta_info_alloc(sdata, addr, gfp);
+ sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
if (!sta)
- return NULL;
+ return;
sta->last_rx = jiffies;
- sta_info_move_state(sta, IEEE80211_STA_AUTH);
- sta_info_move_state(sta, IEEE80211_STA_ASSOC);
- sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
-
/* make sure mandatory rates are always added */
sta->sta.supp_rates[band] = supp_rates |
ieee80211_mandatory_rates(local, band);
- rate_control_rate_init(sta);
-
- /* If it fails, maybe we raced another insertion? */
- if (sta_info_insert(sta))
- return sta_info_get(sdata, addr);
- return sta;
+ spin_lock(&ifibss->incomplete_lock);
+ list_add(&sta->list, &ifibss->incomplete_stations);
+ spin_unlock(&ifibss->incomplete_lock);
+ ieee80211_queue_work(&local->hw, &sdata->work);
}
static int ieee80211_sta_active_ibss(struct ieee80211_sub_if_data *sdata)
@@ -865,6 +925,7 @@
void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
+ struct sta_info *sta;
mutex_lock(&ifibss->mtx);
@@ -876,6 +937,19 @@
if (!ifibss->ssid_len)
goto out;
+ spin_lock_bh(&ifibss->incomplete_lock);
+ while (!list_empty(&ifibss->incomplete_stations)) {
+ sta = list_first_entry(&ifibss->incomplete_stations,
+ struct sta_info, list);
+ list_del(&sta->list);
+ spin_unlock_bh(&ifibss->incomplete_lock);
+
+ ieee80211_ibss_finish_sta(sta);
+ rcu_read_unlock();
+ spin_lock_bh(&ifibss->incomplete_lock);
+ }
+ spin_unlock_bh(&ifibss->incomplete_lock);
+
switch (ifibss->state) {
case IEEE80211_IBSS_MLME_SEARCH:
ieee80211_sta_find_ibss(sdata);
@@ -934,6 +1008,8 @@
setup_timer(&ifibss->timer, ieee80211_ibss_timer,
(unsigned long) sdata);
mutex_init(&ifibss->mtx);
+ INIT_LIST_HEAD(&ifibss->incomplete_stations);
+ spin_lock_init(&ifibss->incomplete_lock);
}
/* scan finished notification */
@@ -1053,6 +1129,7 @@
struct cfg80211_bss *cbss;
u16 capability;
int active_ibss;
+ struct sta_info *sta;
mutex_lock(&sdata->u.ibss.mtx);
@@ -1081,6 +1158,19 @@
}
sta_info_flush(sdata->local, sdata);
+
+ spin_lock_bh(&ifibss->incomplete_lock);
+ while (!list_empty(&ifibss->incomplete_stations)) {
+ sta = list_first_entry(&ifibss->incomplete_stations,
+ struct sta_info, list);
+ list_del(&sta->list);
+ spin_unlock_bh(&ifibss->incomplete_lock);
+
+ sta_info_free(local, sta);
+ spin_lock_bh(&ifibss->incomplete_lock);
+ }
+ spin_unlock_bh(&ifibss->incomplete_lock);
+
netif_carrier_off(sdata->dev);
/* remove beacon */