From 032a3504ee4b51f4f09caf234bd724d597855285 Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@openwrt.org>
Date: Sun, 17 Apr 2011 20:56:14 +0000
Subject: [PATCH] ath9k: assign a keycache slot per station for unencrypted
 links to fix powersave frame filtering

SVN-Revision: 26712
---
 ...1-ath9k_assign_unencrypted_ps_keyidx.patch | 119 ++++++++++++++++++
 1 file changed, 119 insertions(+)
 create mode 100644 package/mac80211/patches/571-ath9k_assign_unencrypted_ps_keyidx.patch

diff --git a/package/mac80211/patches/571-ath9k_assign_unencrypted_ps_keyidx.patch b/package/mac80211/patches/571-ath9k_assign_unencrypted_ps_keyidx.patch
new file mode 100644
index 0000000000..7996f33f67
--- /dev/null
+++ b/package/mac80211/patches/571-ath9k_assign_unencrypted_ps_keyidx.patch
@@ -0,0 +1,119 @@
+--- a/drivers/net/wireless/ath/ath9k/ath9k.h
++++ b/drivers/net/wireless/ath/ath9k/ath9k.h
+@@ -256,6 +256,8 @@ struct ath_node {
+ #endif
+ 	struct ath_atx_tid tid[WME_NUM_TID];
+ 	struct ath_atx_ac ac[WME_NUM_AC];
++	int ps_key;
++
+ 	u16 maxampdu;
+ 	u8 mpdudensity;
+ 
+--- a/drivers/net/wireless/ath/ath9k/main.c
++++ b/drivers/net/wireless/ath/ath9k/main.c
+@@ -1775,18 +1775,37 @@ static int ath9k_sta_add(struct ieee8021
+ 			 struct ieee80211_sta *sta)
+ {
+ 	struct ath_softc *sc = hw->priv;
++	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
++	struct ath_node *an = (struct ath_node *) sta->drv_priv;
++	struct ieee80211_key_conf ps_key = { };
+ 
+ 	ath_node_attach(sc, sta);
++	an->ps_key = ath_key_config(common, vif, sta, &ps_key);
+ 
+ 	return 0;
+ }
+ 
++static void ath9k_del_ps_key(struct ath_softc *sc,
++			     struct ieee80211_vif *vif,
++			     struct ieee80211_sta *sta)
++{
++	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
++	struct ath_node *an = (struct ath_node *) sta->drv_priv;
++	struct ieee80211_key_conf ps_key = { .hw_key_idx = an->ps_key };
++
++	if (!an->ps_key)
++	    return;
++
++	ath_key_delete(common, &ps_key);
++}
++
+ static int ath9k_sta_remove(struct ieee80211_hw *hw,
+ 			    struct ieee80211_vif *vif,
+ 			    struct ieee80211_sta *sta)
+ {
+ 	struct ath_softc *sc = hw->priv;
+ 
++	ath9k_del_ps_key(sc, vif, sta);
+ 	ath_node_detach(sc, sta);
+ 
+ 	return 0;
+@@ -1889,6 +1908,9 @@ static int ath9k_set_key(struct ieee8021
+ 
+ 	switch (cmd) {
+ 	case SET_KEY:
++		if (sta)
++			ath9k_del_ps_key(sc, vif, sta);
++
+ 		ret = ath_key_config(common, vif, sta, key);
+ 		if (ret >= 0) {
+ 			key->hw_key_idx = ret;
+--- a/drivers/net/wireless/ath/key.c
++++ b/drivers/net/wireless/ath/key.c
+@@ -483,6 +483,9 @@ int ath_key_config(struct ath_common *co
+ 	memset(&hk, 0, sizeof(hk));
+ 
+ 	switch (key->cipher) {
++	case 0:
++		hk.kv_type = ATH_CIPHER_CLR;
++		break;
+ 	case WLAN_CIPHER_SUITE_WEP40:
+ 	case WLAN_CIPHER_SUITE_WEP104:
+ 		hk.kv_type = ATH_CIPHER_WEP;
+@@ -498,7 +501,8 @@ int ath_key_config(struct ath_common *co
+ 	}
+ 
+ 	hk.kv_len = key->keylen;
+-	memcpy(hk.kv_val, key->key, key->keylen);
++	if (key->keylen)
++		memcpy(hk.kv_val, key->key, key->keylen);
+ 
+ 	if (!(key->flags & IEEE80211_KEY_FLAG_PAIRWISE)) {
+ 		switch (vif->type) {
+--- a/drivers/net/wireless/ath/ath9k/xmit.c
++++ b/drivers/net/wireless/ath/ath9k/xmit.c
+@@ -1526,7 +1526,7 @@ static void setup_frame_info(struct ieee
+ 	struct ieee80211_key_conf *hw_key = tx_info->control.hw_key;
+ 	struct ieee80211_hdr *hdr;
+ 	struct ath_frame_info *fi = get_frame_info(skb);
+-	struct ath_node *an;
++	struct ath_node *an = NULL;
+ 	struct ath_atx_tid *tid;
+ 	enum ath9k_key_type keytype;
+ 	u16 seqno = 0;
+@@ -1534,11 +1534,13 @@ static void setup_frame_info(struct ieee
+ 
+ 	keytype = ath9k_cmn_get_hw_crypto_keytype(skb);
+ 
++	if (sta)
++		an = (struct ath_node *) sta->drv_priv;
++
+ 	hdr = (struct ieee80211_hdr *)skb->data;
+-	if (sta && ieee80211_is_data_qos(hdr->frame_control) &&
++	if (an && ieee80211_is_data_qos(hdr->frame_control) &&
+ 		conf_is_ht(&hw->conf) && (sc->sc_flags & SC_OP_TXAGGR)) {
+ 
+-		an = (struct ath_node *) sta->drv_priv;
+ 		tidno = ieee80211_get_qos_ctl(hdr)[0] & IEEE80211_QOS_CTL_TID_MASK;
+ 
+ 		/*
+@@ -1554,6 +1556,8 @@ static void setup_frame_info(struct ieee
+ 	memset(fi, 0, sizeof(*fi));
+ 	if (hw_key)
+ 		fi->keyix = hw_key->hw_key_idx;
++	else if (an && ieee80211_is_data(hdr->frame_control) && an->ps_key > 0)
++		fi->keyix = an->ps_key;
+ 	else
+ 		fi->keyix = ATH9K_TXKEYIX_INVALID;
+ 	fi->keytype = keytype;