mac802154: add ieee802154_vif struct

This patch adds an ieee802154_vif similar like the ieee80211_vif which
holds the interface type and maybe further more attributes like the
ieee80211_vif structure.
Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Cc: Varka Bhadram <varkabhadram@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

drivers/net/ieee802154/at86rf230.c

@@ -1533,6 +1533,7 @@ static int at86rf230_probe(struct spi_device *spi)
 	lp->hw = hw;
 	lp->spi = spi;
 	hw->parent = &spi->dev;
+	hw->vif_data_size = sizeof(*lp);
 
 	lp->regmap = devm_regmap_init_spi(spi, &at86rf230_regmap_spi_config);
 	if (IS_ERR(lp->regmap)) {

drivers/net/ieee802154/cc2520.c

@@ -651,6 +651,7 @@ static int cc2520_register(struct cc2520_private *priv)
 	priv->hw->priv = priv;
 	priv->hw->parent = &priv->spi->dev;
 	priv->hw->extra_tx_headroom = 0;
+	priv->hw->vif_data_size = sizeof(*priv);
 
 	/* We do support only 2.4 Ghz */
 	priv->hw->phy->channels_supported[0] = 0x7FFF800;

include/net/mac802154.h

@@ -52,6 +52,13 @@ struct ieee802154_hw_addr_filt {
 	u8	pan_coord;
 };
 
+struct ieee802154_vif {
+	int type;
+
+	/* must be last */
+	u8 drv_priv[0] __aligned(sizeof(void *));
+};
+
 struct ieee802154_hw {
 	/* filled by the driver */
 	int	extra_tx_headroom;
@@ -62,6 +69,7 @@ struct ieee802154_hw {
 	struct	ieee802154_hw_addr_filt hw_filt;
 	void	*priv;
 	struct	wpan_phy *phy;
+	size_t vif_data_size;
 };
 
 /* Checksum is in hardware and is omitted from a packet

net/mac802154/ieee802154_i.h

@@ -79,7 +79,6 @@ struct ieee802154_sub_if_data {
 	struct ieee802154_local *local;
 	struct net_device *dev;
 
-	int type;
 	unsigned long state;
 	char name[IFNAMSIZ];
 
@@ -103,6 +102,8 @@ struct ieee802154_sub_if_data {
 	struct mutex sec_mtx;
 
 	struct mac802154_llsec sec;
+	/* must be last, dynamically sized area in this! */
+	struct ieee802154_vif vif;
 };
 
 #define MAC802154_CHAN_NONE		0xff /* No channel is assigned */

net/mac802154/iface.c

@@ -136,10 +136,11 @@ static int mac802154_slave_open(struct net_device *dev)
 
 	ASSERT_RTNL();
 
-	if (sdata->type == IEEE802154_DEV_WPAN) {
+	if (sdata->vif.type == IEEE802154_DEV_WPAN) {
 		mutex_lock(&sdata->local->iflist_mtx);
 		list_for_each_entry(subif, &sdata->local->interfaces, list) {
-			if (subif != sdata && subif->type == sdata->type &&
+			if (subif != sdata &&
+			    subif->vif.type == sdata->vif.type &&
 			    ieee802154_sdata_running(subif)) {
 				mutex_unlock(&sdata->local->iflist_mtx);
 				return -EBUSY;
@@ -397,7 +398,7 @@ static int
 ieee802154_setup_sdata(struct ieee802154_sub_if_data *sdata, int type)
 {
 	/* set some type-dependent values */
-	sdata->type = type;
+	sdata->vif.type = type;
 
 	get_random_bytes(&sdata->bsn, 1);
 	get_random_bytes(&sdata->dsn, 1);
@@ -447,8 +448,8 @@ ieee802154_if_add(struct ieee802154_local *local, const char *name,
 
 	ASSERT_RTNL();
 
-	ndev = alloc_netdev(sizeof(*sdata), name, NET_NAME_UNKNOWN,
-			    ieee802154_if_setup);
+	ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size, name,
+			    NET_NAME_UNKNOWN, ieee802154_if_setup);
 	if (!ndev)
 		return ERR_PTR(-ENOMEM);
 

net/mac802154/rx.c

@@ -208,7 +208,7 @@ __ieee802154_rx_handle_packet(struct ieee802154_local *local,
 	}
 
 	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
-		if (sdata->type != IEEE802154_DEV_WPAN ||
+		if (sdata->vif.type != IEEE802154_DEV_WPAN ||
 		    !netif_running(sdata->dev))
 			continue;
 
@@ -233,7 +233,7 @@ ieee802154_monitors_rx(struct ieee802154_local *local, struct sk_buff *skb)
 	skb->protocol = htons(ETH_P_IEEE802154);
 
 	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
-		if (sdata->type != IEEE802154_DEV_MONITOR)
+		if (sdata->vif.type != IEEE802154_DEV_MONITOR)
 			continue;
 
 		if (!ieee802154_sdata_running(sdata))