// SPDX-License-Identifier: GPL-2.0 /* * Copyright (C) 2017 Pengutronix, Juergen Borleis <[email protected]> */ #include <linux/dsa/lan9303.h> #include <linux/etherdevice.h> #include <linux/list.h> #include <linux/slab.h> #include "tag.h" /* To define the outgoing port and to discover the incoming port a regular * VLAN tag is used by the LAN9303. But its VID meaning is 'special': * * Dest MAC Src MAC TAG Type * ...| 1 2 3 4 5 6 | 1 2 3 4 5 6 | 1 2 3 4 | 1 2 |... * |<------->| * TAG: * |<------------->| * | 1 2 | 3 4 | * TPID VID * 0x8100 * * VID bit 3 indicates a request for an ALR lookup. * * If VID bit 3 is zero, then bits 0 and 1 specify the destination port * (0, 1, 2) or broadcast (3) or the source port (1, 2). * * VID bit 4 is used to specify if the STP port state should be overridden. * Required when no forwarding between the external ports should happen. */ #define LAN9303_NAME … #define LAN9303_TAG_LEN … #define LAN9303_TAG_TX_USE_ALR … #define LAN9303_TAG_TX_STP_OVERRIDE … #define LAN9303_TAG_RX_IGMP … #define LAN9303_TAG_RX_STP … #define LAN9303_TAG_RX_TRAPPED_TO_CPU … /* 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 frame is unicast, * 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) { … } static struct sk_buff *lan9303_xmit(struct sk_buff *skb, struct net_device *dev) { … } static struct sk_buff *lan9303_rcv(struct sk_buff *skb, struct net_device *dev) { … } static const struct dsa_device_ops lan9303_netdev_ops = …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …; MODULE_ALIAS_DSA_TAG_DRIVER(…); module_dsa_tag_driver(lan9303_netdev_ops);
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