net: dsa: lan9303: Learn addresses on CPU port when bridged

 * GNU General Public License for more details.

 *

 */

#include <linux/dsa/lan9303.h>

#include <linux/etherdevice.h>

#include <linux/list.h>

#include <linux/slab.h>

 */

#define LAN9303_TAG_LEN 4

# define LAN9303_TAG_TX_USE_ALR BIT(3)

# define LAN9303_TAG_TX_STP_OVERRIDE BIT(4)

#define eth_stp_addr eth_reserved_addr_base

/* Decide whether to transmit using ALR lookup, or transmit directly to

 * port using tag. ALR learning is performed only when using ALR lookup.

 * If the two external ports are bridged and the packet is not STP BPDU,

 * then use ALR lookup to allow ALR learning on CPU port.

 * Otherwise transmit directly to port with STP state override.

 * See also: lan9303_separate_ports() and lan9303.pdf 6.4.10.1

 */

static int lan9303_xmit_use_arl(struct dsa_port *dp, u8 *dest_addr)

{

	struct lan9303 *chip = dp->ds->priv;

	return chip->is_bridged && !ether_addr_equal(dest_addr, eth_stp_addr);

}

static struct sk_buff *lan9303_xmit(struct sk_buff *skb, struct net_device *dev)

{

	lan9303_tag = (u16 *)(skb->data + 2 * ETH_ALEN);

	lan9303_tag[0] = htons(ETH_P_8021Q);

	lan9303_tag[1] = htons(dp->index | BIT(4));

	lan9303_tag[1] = lan9303_xmit_use_arl(dp, skb->data) ?

				LAN9303_TAG_TX_USE_ALR :

				dp->index | LAN9303_TAG_TX_STP_OVERRIDE;

	lan9303_tag[1] = htons(lan9303_tag[1]);

	return skb;

}