mac80211: allow configure_filter callback to sleep

Over time, a whole bunch of drivers have come up
with their own scheme to delay the configure_filter
operation to a workqueue. To be able to simplify
things, allow configure_filter to sleep, and add
a new prepare_multicast callback that drivers that
need the multicast address list implement. This new
callback must be atomic, but most drivers either
don't care or just calculate a hash which can be
done atomically and then uploaded to the hardware
non-atomically.

A cursory look suggests that at76c50x-usb, ar9170,
mwl8k (which is actually very broken now), rt2x00,
wl1251, wl1271 and zd1211 should make use of this
new capability.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/adm8211.c

@@ -1328,16 +1328,39 @@ static void adm8211_bss_info_changed(struct ieee80211_hw *dev,
 	}
 }
 
+static u64 adm8211_prepare_multicast(struct ieee80211_hw *hw,
+				     int mc_count, struct dev_addr_list *mclist)
+{
+	unsigned int bit_nr, i;
+	u32 mc_filter[2];
+
+	mc_filter[1] = mc_filter[0] = 0;
+
+	for (i = 0; i < mc_count; i++) {
+		if (!mclist)
+			break;
+		bit_nr = ether_crc(ETH_ALEN, mclist->dmi_addr) >> 26;
+
+		bit_nr &= 0x3F;
+		mc_filter[bit_nr >> 5] |= 1 << (bit_nr & 31);
+		mclist = mclist->next;
+	}
+
+	return mc_filter[0] | ((u64)(mc_filter[1]) << 32);
+}
+
 static void adm8211_configure_filter(struct ieee80211_hw *dev,
 				     unsigned int changed_flags,
 				     unsigned int *total_flags,
-				     int mc_count, struct dev_mc_list *mclist)
+				     u64 multicast)
 {
 	static const u8 bcast[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
 	struct adm8211_priv *priv = dev->priv;
-	unsigned int bit_nr, new_flags;
+	unsigned int new_flags;
 	u32 mc_filter[2];
-	int i;
+
+	mc_filter[0] = multicast;
+	mc_filter[1] = multicast >> 32;
 
 	new_flags = 0;
 
@@ -1346,23 +1369,13 @@ static void adm8211_configure_filter(struct ieee80211_hw *dev,
 		priv->nar |= ADM8211_NAR_PR;
 		priv->nar &= ~ADM8211_NAR_MM;
 		mc_filter[1] = mc_filter[0] = ~0;
-	} else if ((*total_flags & FIF_ALLMULTI) || (mc_count > 32)) {
+	} else if (*total_flags & FIF_ALLMULTI || multicast == ~(0ULL)) {
 		new_flags |= FIF_ALLMULTI;
 		priv->nar &= ~ADM8211_NAR_PR;
 		priv->nar |= ADM8211_NAR_MM;
 		mc_filter[1] = mc_filter[0] = ~0;
 	} else {
 		priv->nar &= ~(ADM8211_NAR_MM | ADM8211_NAR_PR);
-		mc_filter[1] = mc_filter[0] = 0;
-		for (i = 0; i < mc_count; i++) {
-			if (!mclist)
-				break;
-			bit_nr = ether_crc(ETH_ALEN, mclist->dmi_addr) >> 26;
-
-			bit_nr &= 0x3F;
-			mc_filter[bit_nr >> 5] |= 1 << (bit_nr & 31);
-			mclist = mclist->next;
-		}
 	}
 
 	ADM8211_IDLE_RX();
@@ -1757,6 +1770,7 @@ static const struct ieee80211_ops adm8211_ops = {
 	.remove_interface	= adm8211_remove_interface,
 	.config			= adm8211_config,
 	.bss_info_changed	= adm8211_bss_info_changed,
+	.prepare_multicast	= adm8211_prepare_multicast,
 	.configure_filter	= adm8211_configure_filter,
 	.get_stats		= adm8211_get_stats,
 	.get_tx_stats		= adm8211_get_tx_stats,

drivers/net/wireless/at76c50x-usb.c

@@ -1997,15 +1997,14 @@ static void at76_bss_info_changed(struct ieee80211_hw *hw,
 /* must be atomic */
 static void at76_configure_filter(struct ieee80211_hw *hw,
 				  unsigned int changed_flags,
-				  unsigned int *total_flags, int mc_count,
-				  struct dev_addr_list *mc_list)
+				  unsigned int *total_flags, u64 multicast)
 {
 	struct at76_priv *priv = hw->priv;
 	int flags;
 
 	at76_dbg(DBG_MAC80211, "%s(): changed_flags=0x%08x "
-		 "total_flags=0x%08x mc_count=%d",
-		 __func__, changed_flags, *total_flags, mc_count);
+		 "total_flags=0x%08x",
+		 __func__, changed_flags, *total_flags);
 
 	flags = changed_flags & AT76_SUPPORTED_FILTERS;
 	*total_flags = AT76_SUPPORTED_FILTERS;

drivers/net/wireless/ath/ar9170/main.c

@@ -2100,10 +2100,29 @@ static void ar9170_set_filters(struct work_struct *work)
 	mutex_unlock(&ar->mutex);
 }
 
+static u64 ar9170_op_prepare_multicast(struct ieee80211_hw *hw, int mc_count,
+				       struct dev_addr_list *mclist)
+{
+	u64 mchash;
+	int i;
+
+	/* always get broadcast frames */
+	mchash = 1ULL << (0xff >> 2);
+
+	for (i = 0; i < mc_count; i++) {
+		if (WARN_ON(!mclist))
+			break;
+		mchash |= 1ULL << (mclist->dmi_addr[5] >> 2);
+		mclist = mclist->next;
+	}
+
+	return mchash;
+}
+
 static void ar9170_op_configure_filter(struct ieee80211_hw *hw,
 				       unsigned int changed_flags,
 				       unsigned int *new_flags,
-				       int mc_count, struct dev_mc_list *mclist)
+				       u64 multicast)
 {
 	struct ar9170 *ar = hw->priv;
 
@@ -2116,24 +2135,11 @@ static void ar9170_op_configure_filter(struct ieee80211_hw *hw,
 	 * then checking the error flags, later.
 	 */
 
-	if (changed_flags & FIF_ALLMULTI) {
-		if (*new_flags & FIF_ALLMULTI) {
-			ar->want_mc_hash = ~0ULL;
-		} else {
-			u64 mchash;
-			int i;
-
-			/* always get broadcast frames */
-			mchash = 1ULL << (0xff >> 2);
+	if (changed_flags & FIF_ALLMULTI && *new_flags & FIF_ALLMULTI)
+			multicast = ~0ULL;
 
-			for (i = 0; i < mc_count; i++) {
-				if (WARN_ON(!mclist))
-					break;
-				mchash |= 1ULL << (mclist->dmi_addr[5] >> 2);
-				mclist = mclist->next;
-			}
-		ar->want_mc_hash = mchash;
-		}
+	if (multicast != ar->want_mc_hash) {
+		ar->want_mc_hash = multicast;
 		set_bit(AR9170_FILTER_CHANGED_MULTICAST, &ar->filter_changed);
 	}
 
@@ -2543,6 +2549,7 @@ static const struct ieee80211_ops ar9170_ops = {
 	.add_interface		= ar9170_op_add_interface,
 	.remove_interface	= ar9170_op_remove_interface,
 	.config			= ar9170_op_config,
+	.prepare_multicast	= ar9170_op_prepare_multicast,
 	.configure_filter	= ar9170_op_configure_filter,
 	.conf_tx		= ar9170_conf_tx,
 	.bss_info_changed	= ar9170_op_bss_info_changed,

drivers/net/wireless/ath/ath5k/base.c

@@ -229,10 +229,12 @@ static int ath5k_add_interface(struct ieee80211_hw *hw,
 static void ath5k_remove_interface(struct ieee80211_hw *hw,
 		struct ieee80211_if_init_conf *conf);
 static int ath5k_config(struct ieee80211_hw *hw, u32 changed);
+static u64 ath5k_prepare_multicast(struct ieee80211_hw *hw,
+				   int mc_count, struct dev_addr_list *mc_list);
 static void ath5k_configure_filter(struct ieee80211_hw *hw,
 		unsigned int changed_flags,
 		unsigned int *new_flags,
-		int mc_count, struct dev_mc_list *mclist);
+		u64 multicast);
 static int ath5k_set_key(struct ieee80211_hw *hw,
 		enum set_key_cmd cmd,
 		struct ieee80211_vif *vif, struct ieee80211_sta *sta,
@@ -260,6 +262,7 @@ static const struct ieee80211_ops ath5k_hw_ops = {
 	.add_interface 	= ath5k_add_interface,
 	.remove_interface = ath5k_remove_interface,
 	.config 	= ath5k_config,
+	.prepare_multicast = ath5k_prepare_multicast,
 	.configure_filter = ath5k_configure_filter,
 	.set_key 	= ath5k_set_key,
 	.get_stats 	= ath5k_get_stats,
@@ -2853,6 +2856,37 @@ ath5k_config(struct ieee80211_hw *hw, u32 changed)
 	return ret;
 }
 
+static u64 ath5k_prepare_multicast(struct ieee80211_hw *hw,
+				   int mc_count, struct dev_addr_list *mclist)
+{
+	u32 mfilt[2], val;
+	int i;
+	u8 pos;
+
+	mfilt[0] = 0;
+	mfilt[1] = 1;
+
+	for (i = 0; i < mc_count; i++) {
+		if (!mclist)
+			break;
+		/* calculate XOR of eight 6-bit values */
+		val = get_unaligned_le32(mclist->dmi_addr + 0);
+		pos = (val >> 18) ^ (val >> 12) ^ (val >> 6) ^ val;
+		val = get_unaligned_le32(mclist->dmi_addr + 3);
+		pos ^= (val >> 18) ^ (val >> 12) ^ (val >> 6) ^ val;
+		pos &= 0x3f;
+		mfilt[pos / 32] |= (1 << (pos % 32));
+		/* XXX: we might be able to just do this instead,
+		* but not sure, needs testing, if we do use this we'd
+		* neet to inform below to not reset the mcast */
+		/* ath5k_hw_set_mcast_filterindex(ah,
+		 *      mclist->dmi_addr[5]); */
+		mclist = mclist->next;
+	}
+
+	return ((u64)(mfilt[1]) << 32) | mfilt[0];
+}
+
 #define SUPPORTED_FIF_FLAGS \
 	FIF_PROMISC_IN_BSS |  FIF_ALLMULTI | FIF_FCSFAIL | \
 	FIF_PLCPFAIL | FIF_CONTROL | FIF_OTHER_BSS | \
@@ -2878,16 +2912,14 @@ ath5k_config(struct ieee80211_hw *hw, u32 changed)
 static void ath5k_configure_filter(struct ieee80211_hw *hw,
 		unsigned int changed_flags,
 		unsigned int *new_flags,
-		int mc_count, struct dev_mc_list *mclist)
+		u64 multicast)
 {
 	struct ath5k_softc *sc = hw->priv;
 	struct ath5k_hw *ah = sc->ah;
-	u32 mfilt[2], val, rfilt;
-	u8 pos;
-	int i;
+	u32 mfilt[2], rfilt;
 
-	mfilt[0] = 0;
-	mfilt[1] = 0;
+	mfilt[0] = multicast;
+	mfilt[1] = multicast >> 32;
 
 	/* Only deal with supported flags */
 	changed_flags &= SUPPORTED_FIF_FLAGS;
@@ -2913,24 +2945,6 @@ static void ath5k_configure_filter(struct ieee80211_hw *hw,
 	if (*new_flags & FIF_ALLMULTI) {
 		mfilt[0] =  ~0;
 		mfilt[1] =  ~0;
-	} else {
-		for (i = 0; i < mc_count; i++) {
-			if (!mclist)
-				break;
-			/* calculate XOR of eight 6-bit values */
-			val = get_unaligned_le32(mclist->dmi_addr + 0);
-			pos = (val >> 18) ^ (val >> 12) ^ (val >> 6) ^ val;
-			val = get_unaligned_le32(mclist->dmi_addr + 3);
-			pos ^= (val >> 18) ^ (val >> 12) ^ (val >> 6) ^ val;
-			pos &= 0x3f;
-			mfilt[pos / 32] |= (1 << (pos % 32));
-			/* XXX: we might be able to just do this instead,
-			* but not sure, needs testing, if we do use this we'd
-			* neet to inform below to not reset the mcast */
-			/* ath5k_hw_set_mcast_filterindex(ah,
-			 *      mclist->dmi_addr[5]); */
-			mclist = mclist->next;
-		}
 	}
 
 	/* This is the best we can do */

drivers/net/wireless/ath/ath9k/main.c

@@ -2394,8 +2394,7 @@ static int ath9k_config(struct ieee80211_hw *hw, u32 changed)
 static void ath9k_configure_filter(struct ieee80211_hw *hw,
 				   unsigned int changed_flags,
 				   unsigned int *total_flags,
-				   int mc_count,
-				   struct dev_mc_list *mclist)
+				   u64 multicast)
 {
 	struct ath_wiphy *aphy = hw->priv;
 	struct ath_softc *sc = aphy->sc;

drivers/net/wireless/b43/main.c

@@ -3679,7 +3679,7 @@ static int b43_op_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
 
 static void b43_op_configure_filter(struct ieee80211_hw *hw,
 				    unsigned int changed, unsigned int *fflags,
-				    int mc_count, struct dev_addr_list *mc_list)
+				    u64 multicast)
 {
 	struct b43_wl *wl = hw_to_b43_wl(hw);
 	struct b43_wldev *dev = wl->current_dev;

drivers/net/wireless/b43legacy/main.c

@@ -2836,9 +2836,7 @@ static void b43legacy_op_bss_info_changed(struct ieee80211_hw *hw,
 
 static void b43legacy_op_configure_filter(struct ieee80211_hw *hw,
 					  unsigned int changed,
-					  unsigned int *fflags,
-					  int mc_count,
-					  struct dev_addr_list *mc_list)
+					  unsigned int *fflags,u64 multicast)
 {
 	struct b43legacy_wl *wl = hw_to_b43legacy_wl(hw);
 	struct b43legacy_wldev *dev = wl->current_dev;

drivers/net/wireless/iwlwifi/iwl-core.c

@@ -1514,7 +1514,7 @@ EXPORT_SYMBOL(iwl_irq_handle_error);
 void iwl_configure_filter(struct ieee80211_hw *hw,
 			  unsigned int changed_flags,
 			  unsigned int *total_flags,
-			  int mc_count, struct dev_addr_list *mc_list)
+			  u64 multicast)
 {
 	struct iwl_priv *priv = hw->priv;
 	__le32 *filter_flags = &priv->staging_rxon.filter_flags;

drivers/net/wireless/iwlwifi/iwl-core.h

@@ -282,8 +282,7 @@ int iwl_set_decrypted_flag(struct iwl_priv *priv,
 void iwl_irq_handle_error(struct iwl_priv *priv);
 void iwl_configure_filter(struct ieee80211_hw *hw,
 			  unsigned int changed_flags,
-			  unsigned int *total_flags,
-			  int mc_count, struct dev_addr_list *mc_list);
+			  unsigned int *total_flags, u64 multicast);
 int iwl_hw_nic_init(struct iwl_priv *priv);
 int iwl_setup_mac(struct iwl_priv *priv);
 int iwl_set_hw_params(struct iwl_priv *priv);

drivers/net/wireless/libertas_tf/main.c

@@ -366,15 +366,35 @@ static int lbtf_op_config(struct ieee80211_hw *hw, u32 changed)
 	return 0;
 }
 
+static u64 lbtf_op_prepare_multicast(struct ieee80211_hw *hw,
+				     int mc_count, struct dev_addr_list *mclist)
+{
+	struct lbtf_private *priv = hw->priv;
+	int i;
+
+	if (!mc_count || mc_count > MRVDRV_MAX_MULTICAST_LIST_SIZE)
+		return mc_count;
+
+	priv->nr_of_multicastmacaddr = mc_count;
+	for (i = 0; i < mc_count; i++) {
+		if (!mclist)
+			break;
+		memcpy(&priv->multicastlist[i], mclist->da_addr,
+				ETH_ALEN);
+		mclist = mclist->next;
+	}
+
+	return mc_count;
+}
+
 #define SUPPORTED_FIF_FLAGS  (FIF_PROMISC_IN_BSS | FIF_ALLMULTI)
 static void lbtf_op_configure_filter(struct ieee80211_hw *hw,
 			unsigned int changed_flags,
 			unsigned int *new_flags,
-			int mc_count, struct dev_mc_list *mclist)
+			u64 multicast)
 {
 	struct lbtf_private *priv = hw->priv;
 	int old_mac_control = priv->mac_control;
-	int i;
 	changed_flags &= SUPPORTED_FIF_FLAGS;
 	*new_flags &= SUPPORTED_FIF_FLAGS;
 
@@ -386,20 +406,12 @@ static void lbtf_op_configure_filter(struct ieee80211_hw *hw,
 	else
 		priv->mac_control &= ~CMD_ACT_MAC_PROMISCUOUS_ENABLE;
 	if (*new_flags & (FIF_ALLMULTI) ||
-	    mc_count > MRVDRV_MAX_MULTICAST_LIST_SIZE) {
+	    multicast > MRVDRV_MAX_MULTICAST_LIST_SIZE) {
 		priv->mac_control |= CMD_ACT_MAC_ALL_MULTICAST_ENABLE;
 		priv->mac_control &= ~CMD_ACT_MAC_MULTICAST_ENABLE;
-	} else if (mc_count) {
+	} else if (multicast) {
 		priv->mac_control |= CMD_ACT_MAC_MULTICAST_ENABLE;
 		priv->mac_control &= ~CMD_ACT_MAC_ALL_MULTICAST_ENABLE;
-		priv->nr_of_multicastmacaddr = mc_count;
-		for (i = 0; i < mc_count; i++) {
-			if (!mclist)
-				break;
-			memcpy(&priv->multicastlist[i], mclist->da_addr,
-					ETH_ALEN);
-			mclist = mclist->next;
-		}
 		lbtf_cmd_set_mac_multicast_addr(priv);
 	} else {
 		priv->mac_control &= ~(CMD_ACT_MAC_MULTICAST_ENABLE |
@@ -461,6 +473,7 @@ static const struct ieee80211_ops lbtf_ops = {
 	.add_interface		= lbtf_op_add_interface,
 	.remove_interface	= lbtf_op_remove_interface,
 	.config			= lbtf_op_config,
+	.prepare_multicast	= lbtf_op_prepare_multicast,
 	.configure_filter	= lbtf_op_configure_filter,
 	.bss_info_changed	= lbtf_op_bss_info_changed,
 };

drivers/net/wireless/mac80211_hwsim.c

@@ -582,9 +582,7 @@ static int mac80211_hwsim_config(struct ieee80211_hw *hw, u32 changed)
 
 static void mac80211_hwsim_configure_filter(struct ieee80211_hw *hw,
 					    unsigned int changed_flags,
-					    unsigned int *total_flags,
-					    int mc_count,
-					    struct dev_addr_list *mc_list)
+					    unsigned int *total_flags,u64 multicast)
 {
 	struct mac80211_hwsim_data *data = hw->priv;