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-rw-r--r--net/mac80211/cfg.c2
-rw-r--r--net/mac80211/ieee80211_i.h2
-rw-r--r--net/mac80211/iface.c2
-rw-r--r--net/mac80211/key.c63
-rw-r--r--net/mac80211/key.h4
-rw-r--r--net/mac80211/sta_info.c6
6 files changed, 68 insertions, 11 deletions
diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index f9cbdc29946d..8baa561c8f5b 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -254,7 +254,7 @@ static int ieee80211_del_key(struct wiphy *wiphy, struct net_device *dev,
goto out_unlock;
}
- __ieee80211_key_free(key);
+ __ieee80211_key_free(key, true);
ret = 0;
out_unlock:
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 0acc07b852a9..54d09ec3fe68 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -680,6 +680,8 @@ struct ieee80211_sub_if_data {
/* count for keys needing tailroom space allocation */
int crypto_tx_tailroom_needed_cnt;
+ int crypto_tx_tailroom_pending_dec;
+ struct delayed_work dec_tailroom_needed_wk;
struct net_device *dev;
struct ieee80211_local *local;
diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c
index 1ee10cd1d5b6..8e0bf34f3f68 100644
--- a/net/mac80211/iface.c
+++ b/net/mac80211/iface.c
@@ -1543,6 +1543,8 @@ int ieee80211_if_add(struct ieee80211_local *local, const char *name,
INIT_WORK(&sdata->cleanup_stations_wk, ieee80211_cleanup_sdata_stas_wk);
INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
ieee80211_dfs_cac_timer_work);
+ INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
+ ieee80211_delayed_tailroom_dec);
for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
struct ieee80211_supported_band *sband;
diff --git a/net/mac80211/key.c b/net/mac80211/key.c
index 6eb4888a70ed..99e9f6ae6a54 100644
--- a/net/mac80211/key.c
+++ b/net/mac80211/key.c
@@ -397,7 +397,8 @@ struct ieee80211_key *ieee80211_key_alloc(u32 cipher, int idx, size_t key_len,
return key;
}
-static void __ieee80211_key_destroy(struct ieee80211_key *key)
+static void __ieee80211_key_destroy(struct ieee80211_key *key,
+ bool delay_tailroom)
{
if (!key)
return;
@@ -416,8 +417,18 @@ static void __ieee80211_key_destroy(struct ieee80211_key *key)
if (key->conf.cipher == WLAN_CIPHER_SUITE_AES_CMAC)
ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm);
if (key->local) {
+ struct ieee80211_sub_if_data *sdata = key->sdata;
+
ieee80211_debugfs_key_remove(key);
- key->sdata->crypto_tx_tailroom_needed_cnt--;
+
+ if (delay_tailroom) {
+ /* see ieee80211_delayed_tailroom_dec */
+ sdata->crypto_tx_tailroom_pending_dec++;
+ schedule_delayed_work(&sdata->dec_tailroom_needed_wk,
+ HZ/2);
+ } else {
+ sdata->crypto_tx_tailroom_needed_cnt--;
+ }
}
kfree(key);
@@ -452,7 +463,7 @@ int ieee80211_key_link(struct ieee80211_key *key,
increment_tailroom_need_count(sdata);
__ieee80211_key_replace(sdata, sta, pairwise, old_key, key);
- __ieee80211_key_destroy(old_key);
+ __ieee80211_key_destroy(old_key, true);
ieee80211_debugfs_key_add(key);
@@ -463,7 +474,7 @@ int ieee80211_key_link(struct ieee80211_key *key,
return ret;
}
-void __ieee80211_key_free(struct ieee80211_key *key)
+void __ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom)
{
if (!key)
return;
@@ -475,14 +486,14 @@ void __ieee80211_key_free(struct ieee80211_key *key)
__ieee80211_key_replace(key->sdata, key->sta,
key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE,
key, NULL);
- __ieee80211_key_destroy(key);
+ __ieee80211_key_destroy(key, delay_tailroom);
}
void ieee80211_key_free(struct ieee80211_local *local,
struct ieee80211_key *key)
{
mutex_lock(&local->key_mtx);
- __ieee80211_key_free(key);
+ __ieee80211_key_free(key, true);
mutex_unlock(&local->key_mtx);
}
@@ -544,18 +555,56 @@ void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_key *key, *tmp;
+ cancel_delayed_work_sync(&sdata->dec_tailroom_needed_wk);
+
mutex_lock(&sdata->local->key_mtx);
+ sdata->crypto_tx_tailroom_needed_cnt -=
+ sdata->crypto_tx_tailroom_pending_dec;
+ sdata->crypto_tx_tailroom_pending_dec = 0;
+
ieee80211_debugfs_key_remove_mgmt_default(sdata);
list_for_each_entry_safe(key, tmp, &sdata->key_list, list)
- __ieee80211_key_free(key);
+ __ieee80211_key_free(key, false);
ieee80211_debugfs_key_update_default(sdata);
+ WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt ||
+ sdata->crypto_tx_tailroom_pending_dec);
+
mutex_unlock(&sdata->local->key_mtx);
}
+void ieee80211_delayed_tailroom_dec(struct work_struct *wk)
+{
+ struct ieee80211_sub_if_data *sdata;
+
+ sdata = container_of(wk, struct ieee80211_sub_if_data,
+ dec_tailroom_needed_wk.work);
+
+ /*
+ * The reason for the delayed tailroom needed decrementing is to
+ * make roaming faster: during roaming, all keys are first deleted
+ * and then new keys are installed. The first new key causes the
+ * crypto_tx_tailroom_needed_cnt to go from 0 to 1, which invokes
+ * the cost of synchronize_net() (which can be slow). Avoid this
+ * by deferring the crypto_tx_tailroom_needed_cnt decrementing on
+ * key removal for a while, so if we roam the value is larger than
+ * zero and no 0->1 transition happens.
+ *
+ * The cost is that if the AP switching was from an AP with keys
+ * to one without, we still allocate tailroom while it would no
+ * longer be needed. However, in the typical (fast) roaming case
+ * within an ESS this usually won't happen.
+ */
+
+ mutex_lock(&sdata->local->key_mtx);
+ sdata->crypto_tx_tailroom_needed_cnt -=
+ sdata->crypto_tx_tailroom_pending_dec;
+ sdata->crypto_tx_tailroom_pending_dec = 0;
+ mutex_unlock(&sdata->local->key_mtx);
+}
void ieee80211_gtk_rekey_notify(struct ieee80211_vif *vif, const u8 *bssid,
const u8 *replay_ctr, gfp_t gfp)
diff --git a/net/mac80211/key.h b/net/mac80211/key.h
index 8b037307a586..2a682d81cee9 100644
--- a/net/mac80211/key.h
+++ b/net/mac80211/key.h
@@ -134,7 +134,7 @@ struct ieee80211_key *ieee80211_key_alloc(u32 cipher, int idx, size_t key_len,
int __must_check ieee80211_key_link(struct ieee80211_key *key,
struct ieee80211_sub_if_data *sdata,
struct sta_info *sta);
-void __ieee80211_key_free(struct ieee80211_key *key);
+void __ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom);
void ieee80211_key_free(struct ieee80211_local *local,
struct ieee80211_key *key);
void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx,
@@ -147,4 +147,6 @@ void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata);
#define key_mtx_dereference(local, ref) \
rcu_dereference_protected(ref, lockdep_is_held(&((local)->key_mtx)))
+void ieee80211_delayed_tailroom_dec(struct work_struct *wk);
+
#endif /* IEEE80211_KEY_H */
diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c
index a79ce820cb50..0141e4951adf 100644
--- a/net/mac80211/sta_info.c
+++ b/net/mac80211/sta_info.c
@@ -794,9 +794,11 @@ int __must_check __sta_info_destroy(struct sta_info *sta)
mutex_lock(&local->key_mtx);
for (i = 0; i < NUM_DEFAULT_KEYS; i++)
- __ieee80211_key_free(key_mtx_dereference(local, sta->gtk[i]));
+ __ieee80211_key_free(key_mtx_dereference(local, sta->gtk[i]),
+ true);
if (sta->ptk)
- __ieee80211_key_free(key_mtx_dereference(local, sta->ptk));
+ __ieee80211_key_free(key_mtx_dereference(local, sta->ptk),
+ true);
mutex_unlock(&local->key_mtx);
sta->dead = true;
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