// SPDX-License-Identifier: GPL-2.0+ /* * Broadcom tag support * * Copyright (C) 2014 Broadcom Corporation */ #include <linux/dsa/brcm.h> #include <linux/etherdevice.h> #include <linux/if_vlan.h> #include <linux/list.h> #include <linux/slab.h> #include "tag.h" #define BRCM_NAME … #define BRCM_LEGACY_NAME … #define BRCM_PREPEND_NAME … /* Legacy Broadcom tag (6 bytes) */ #define BRCM_LEG_TAG_LEN … /* Type fields */ /* 1st byte in the tag */ #define BRCM_LEG_TYPE_HI … /* 2nd byte in the tag */ #define BRCM_LEG_TYPE_LO … /* Tag fields */ /* 3rd byte in the tag */ #define BRCM_LEG_UNICAST … #define BRCM_LEG_MULTICAST … #define BRCM_LEG_EGRESS … #define BRCM_LEG_INGRESS … /* 6th byte in the tag */ #define BRCM_LEG_PORT_ID … /* Newer Broadcom tag (4 bytes) */ #define BRCM_TAG_LEN … /* Tag is constructed and deconstructed using byte by byte access * because the tag is placed after the MAC Source Address, which does * not make it 4-bytes aligned, so this might cause unaligned accesses * on most systems where this is used. */ /* Ingress and egress opcodes */ #define BRCM_OPCODE_SHIFT … #define BRCM_OPCODE_MASK … /* Ingress fields */ /* 1st byte in the tag */ #define BRCM_IG_TC_SHIFT … #define BRCM_IG_TC_MASK … /* 2nd byte in the tag */ #define BRCM_IG_TE_MASK … #define BRCM_IG_TS_SHIFT … /* 3rd byte in the tag */ #define BRCM_IG_DSTMAP2_MASK … #define BRCM_IG_DSTMAP1_MASK … /* Egress fields */ /* 2nd byte in the tag */ #define BRCM_EG_CID_MASK … /* 3rd byte in the tag */ #define BRCM_EG_RC_MASK … #define BRCM_EG_RC_RSVD … #define BRCM_EG_RC_EXCEPTION … #define BRCM_EG_RC_PROT_SNOOP … #define BRCM_EG_RC_PROT_TERM … #define BRCM_EG_RC_SWITCH … #define BRCM_EG_RC_MAC_LEARN … #define BRCM_EG_RC_MIRROR … #define BRCM_EG_TC_SHIFT … #define BRCM_EG_TC_MASK … #define BRCM_EG_PID_MASK … #if IS_ENABLED(CONFIG_NET_DSA_TAG_BRCM) || \ IS_ENABLED(CONFIG_NET_DSA_TAG_BRCM_PREPEND) static struct sk_buff *brcm_tag_xmit_ll(struct sk_buff *skb, struct net_device *dev, unsigned int offset) { … } /* Frames with this tag have one of these two layouts: * ----------------------------------- * | MAC DA | MAC SA | 4b tag | Type | DSA_TAG_PROTO_BRCM * ----------------------------------- * ----------------------------------- * | 4b tag | MAC DA | MAC SA | Type | DSA_TAG_PROTO_BRCM_PREPEND * ----------------------------------- * In both cases, at receive time, skb->data points 2 bytes before the actual * Ethernet type field and we have an offset of 4bytes between where skb->data * and where the payload starts. So the same low-level receive function can be * used. */ static struct sk_buff *brcm_tag_rcv_ll(struct sk_buff *skb, struct net_device *dev, unsigned int offset) { … } #endif #if IS_ENABLED(CONFIG_NET_DSA_TAG_BRCM) static struct sk_buff *brcm_tag_xmit(struct sk_buff *skb, struct net_device *dev) { … } static struct sk_buff *brcm_tag_rcv(struct sk_buff *skb, struct net_device *dev) { … } static const struct dsa_device_ops brcm_netdev_ops = …; DSA_TAG_DRIVER(brcm_netdev_ops); MODULE_ALIAS_DSA_TAG_DRIVER(…); #endif #if IS_ENABLED(CONFIG_NET_DSA_TAG_BRCM_LEGACY) static struct sk_buff *brcm_leg_tag_xmit(struct sk_buff *skb, struct net_device *dev) { … } static struct sk_buff *brcm_leg_tag_rcv(struct sk_buff *skb, struct net_device *dev) { … } static const struct dsa_device_ops brcm_legacy_netdev_ops = …; DSA_TAG_DRIVER(brcm_legacy_netdev_ops); MODULE_ALIAS_DSA_TAG_DRIVER(…); #endif /* CONFIG_NET_DSA_TAG_BRCM_LEGACY */ #if IS_ENABLED(CONFIG_NET_DSA_TAG_BRCM_PREPEND) static struct sk_buff *brcm_tag_xmit_prepend(struct sk_buff *skb, struct net_device *dev) { … } static struct sk_buff *brcm_tag_rcv_prepend(struct sk_buff *skb, struct net_device *dev) { … } static const struct dsa_device_ops brcm_prepend_netdev_ops = …; DSA_TAG_DRIVER(brcm_prepend_netdev_ops); MODULE_ALIAS_DSA_TAG_DRIVER(…); #endif static struct dsa_tag_driver *dsa_tag_driver_array[] = …; module_dsa_tag_drivers(dsa_tag_driver_array); MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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