From 2c848d33a99fa55a9cae4d3c6dd89b7ee93bd70c Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@openwrt.org>
Date: Tue, 14 Sep 2010 16:26:46 +0000
Subject: [PATCH] ath9k: fix multi-bss operation (fixes #7914)

SVN-Revision: 23059
---
 .../patches/550-ath9k_bssid_mask_fix.patch    | 117 ++++++++++++++++++
 1 file changed, 117 insertions(+)
 create mode 100644 package/mac80211/patches/550-ath9k_bssid_mask_fix.patch

diff --git a/package/mac80211/patches/550-ath9k_bssid_mask_fix.patch b/package/mac80211/patches/550-ath9k_bssid_mask_fix.patch
new file mode 100644
index 0000000000..f448870430
--- /dev/null
+++ b/package/mac80211/patches/550-ath9k_bssid_mask_fix.patch
@@ -0,0 +1,117 @@
+--- a/drivers/net/wireless/ath/ath9k/virtual.c
++++ b/drivers/net/wireless/ath/ath9k/virtual.c
+@@ -19,45 +19,36 @@
+ #include "ath9k.h"
+ 
+ struct ath9k_vif_iter_data {
+-	int count;
+-	u8 *addr;
++	const u8 *hw_macaddr;
++	u8 mask[ETH_ALEN];
+ };
+ 
+ static void ath9k_vif_iter(void *data, u8 *mac, struct ieee80211_vif *vif)
+ {
+ 	struct ath9k_vif_iter_data *iter_data = data;
+-	u8 *nbuf;
+-
+-	nbuf = krealloc(iter_data->addr, (iter_data->count + 1) * ETH_ALEN,
+-			GFP_ATOMIC);
+-	if (nbuf == NULL)
+-		return;
++	int i;
+ 
+-	memcpy(nbuf + iter_data->count * ETH_ALEN, mac, ETH_ALEN);
+-	iter_data->addr = nbuf;
+-	iter_data->count++;
++	for (i = 0; i < ETH_ALEN; i++)
++		iter_data->mask[i] &= ~(iter_data->hw_macaddr[i] ^ mac[i]);
+ }
+ 
+-void ath9k_set_bssid_mask(struct ieee80211_hw *hw)
++void ath9k_set_bssid_mask(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
+ {
+ 	struct ath_wiphy *aphy = hw->priv;
+ 	struct ath_softc *sc = aphy->sc;
+ 	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
+ 	struct ath9k_vif_iter_data iter_data;
+-	int i, j;
+-	u8 mask[ETH_ALEN];
++	int i;
+ 
+ 	/*
+-	 * Add primary MAC address even if it is not in active use since it
+-	 * will be configured to the hardware as the starting point and the
+-	 * BSSID mask will need to be changed if another address is active.
++	 * Use the hardware MAC address as reference, the hardware uses it
++	 * together with the BSSID mask when matching addresses.
+ 	 */
+-	iter_data.addr = kmalloc(ETH_ALEN, GFP_ATOMIC);
+-	if (iter_data.addr) {
+-		memcpy(iter_data.addr, common->macaddr, ETH_ALEN);
+-		iter_data.count = 1;
+-	} else
+-		iter_data.count = 0;
++	iter_data.hw_macaddr = common->macaddr;
++	memset(&iter_data.mask, 0xff, ETH_ALEN);
++
++	if (vif)
++		ath9k_vif_iter(&iter_data, vif->addr, vif);
+ 
+ 	/* Get list of all active MAC addresses */
+ 	spin_lock_bh(&sc->wiphy_lock);
+@@ -71,31 +62,7 @@ void ath9k_set_bssid_mask(struct ieee802
+ 	}
+ 	spin_unlock_bh(&sc->wiphy_lock);
+ 
+-	/* Generate an address mask to cover all active addresses */
+-	memset(mask, 0, ETH_ALEN);
+-	for (i = 0; i < iter_data.count; i++) {
+-		u8 *a1 = iter_data.addr + i * ETH_ALEN;
+-		for (j = i + 1; j < iter_data.count; j++) {
+-			u8 *a2 = iter_data.addr + j * ETH_ALEN;
+-			mask[0] |= a1[0] ^ a2[0];
+-			mask[1] |= a1[1] ^ a2[1];
+-			mask[2] |= a1[2] ^ a2[2];
+-			mask[3] |= a1[3] ^ a2[3];
+-			mask[4] |= a1[4] ^ a2[4];
+-			mask[5] |= a1[5] ^ a2[5];
+-		}
+-	}
+-
+-	kfree(iter_data.addr);
+-
+-	/* Invert the mask and configure hardware */
+-	common->bssidmask[0] = ~mask[0];
+-	common->bssidmask[1] = ~mask[1];
+-	common->bssidmask[2] = ~mask[2];
+-	common->bssidmask[3] = ~mask[3];
+-	common->bssidmask[4] = ~mask[4];
+-	common->bssidmask[5] = ~mask[5];
+-
++	memcpy(common->bssidmask, iter_data.mask, ETH_ALEN);
+ 	ath_hw_setbssidmask(common);
+ }
+ 
+--- a/drivers/net/wireless/ath/ath9k/ath9k.h
++++ b/drivers/net/wireless/ath/ath9k/ath9k.h
+@@ -666,7 +666,7 @@ static inline void ath_ahb_exit(void) {}
+ void ath9k_ps_wakeup(struct ath_softc *sc);
+ void ath9k_ps_restore(struct ath_softc *sc);
+ 
+-void ath9k_set_bssid_mask(struct ieee80211_hw *hw);
++void ath9k_set_bssid_mask(struct ieee80211_hw *hw, struct ieee80211_vif *vif);
+ int ath9k_wiphy_add(struct ath_softc *sc);
+ int ath9k_wiphy_del(struct ath_wiphy *aphy);
+ void ath9k_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb);
+--- a/drivers/net/wireless/ath/ath9k/main.c
++++ b/drivers/net/wireless/ath/ath9k/main.c
+@@ -1416,7 +1416,7 @@ static int ath9k_add_interface(struct ie
+ 	sc->nvifs++;
+ 
+ 	if (ah->caps.hw_caps & ATH9K_HW_CAP_BSSIDMASK)
+-		ath9k_set_bssid_mask(hw);
++		ath9k_set_bssid_mask(hw, vif);
+ 
+ 	if (sc->nvifs > 1)
+ 		goto out; /* skip global settings for secondary vif */
-- 
2.30.2