summaryrefslogtreecommitdiff
path: root/net/dsa/tag_brcm.c
blob: 8e4bdb9d9ae365da792e52c1f13adb432a20dfeb (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
/*
 * Broadcom tag support
 *
 * Copyright (C) 2014 Broadcom Corporation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <linux/etherdevice.h>
#include <linux/list.h>
#include <linux/slab.h>

#include "dsa_priv.h"

/* This tag length is 4 bytes, older ones were 6 bytes, we do not
 * handle them
 */
#define BRCM_TAG_LEN	4

/* Tag is constructed and desconstructed 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	5
#define BRCM_OPCODE_MASK	0x7

/* Ingress fields */
/* 1st byte in the tag */
#define BRCM_IG_TC_SHIFT	2
#define BRCM_IG_TC_MASK		0x7
/* 2nd byte in the tag */
#define BRCM_IG_TE_MASK		0x3
#define BRCM_IG_TS_SHIFT	7
/* 3rd byte in the tag */
#define BRCM_IG_DSTMAP2_MASK	1
#define BRCM_IG_DSTMAP1_MASK	0xff

/* Egress fields */

/* 2nd byte in the tag */
#define BRCM_EG_CID_MASK	0xff

/* 3rd byte in the tag */
#define BRCM_EG_RC_MASK		0xff
#define  BRCM_EG_RC_RSVD	(3 << 6)
#define  BRCM_EG_RC_EXCEPTION	(1 << 5)
#define  BRCM_EG_RC_PROT_SNOOP	(1 << 4)
#define  BRCM_EG_RC_PROT_TERM	(1 << 3)
#define  BRCM_EG_RC_SWITCH	(1 << 2)
#define  BRCM_EG_RC_MAC_LEARN	(1 << 1)
#define  BRCM_EG_RC_MIRROR	(1 << 0)
#define BRCM_EG_TC_SHIFT	5
#define BRCM_EG_TC_MASK		0x7
#define BRCM_EG_PID_MASK	0x1f

static struct sk_buff *brcm_tag_xmit(struct sk_buff *skb, struct net_device *dev)
{
	struct dsa_slave_priv *p = netdev_priv(dev);
	u16 queue = skb_get_queue_mapping(skb);
	u8 *brcm_tag;

	if (skb_cow_head(skb, BRCM_TAG_LEN) < 0)
		return NULL;

	skb_push(skb, BRCM_TAG_LEN);

	memmove(skb->data, skb->data + BRCM_TAG_LEN, 2 * ETH_ALEN);

	/* Build the tag after the MAC Source Address */
	brcm_tag = skb->data + 2 * ETH_ALEN;

	/* Set the ingress opcode, traffic class, tag enforcment is
	 * deprecated
	 */
	brcm_tag[0] = (1 << BRCM_OPCODE_SHIFT) |
		       ((queue & BRCM_IG_TC_MASK) << BRCM_IG_TC_SHIFT);
	brcm_tag[1] = 0;
	brcm_tag[2] = 0;
	if (p->dp->index == 8)
		brcm_tag[2] = BRCM_IG_DSTMAP2_MASK;
	brcm_tag[3] = (1 << p->dp->index) & BRCM_IG_DSTMAP1_MASK;

	return skb;
}

static struct sk_buff *brcm_tag_rcv(struct sk_buff *skb, struct net_device *dev,
				    struct packet_type *pt)
{
	int source_port;
	u8 *brcm_tag;

	if (unlikely(!pskb_may_pull(skb, BRCM_TAG_LEN)))
		return NULL;

	/* skb->data points to the EtherType, the tag is right before it */
	brcm_tag = skb->data - 2;

	/* The opcode should never be different than 0b000 */
	if (unlikely((brcm_tag[0] >> BRCM_OPCODE_SHIFT) & BRCM_OPCODE_MASK))
		return NULL;

	/* We should never see a reserved reason code without knowing how to
	 * handle it
	 */
	if (unlikely(brcm_tag[2] & BRCM_EG_RC_RSVD))
		return NULL;

	/* Locate which port this is coming from */
	source_port = brcm_tag[3] & BRCM_EG_PID_MASK;

	skb->dev = dsa_master_get_slave(dev, 0, source_port);
	if (!skb->dev)
		return NULL;

	/* Remove Broadcom tag and update checksum */
	skb_pull_rcsum(skb, BRCM_TAG_LEN);

	/* Move the Ethernet DA and SA */
	memmove(skb->data - ETH_HLEN,
		skb->data - ETH_HLEN - BRCM_TAG_LEN,
		2 * ETH_ALEN);

	return skb;
}

const struct dsa_device_ops brcm_netdev_ops = {
	.xmit	= brcm_tag_xmit,
	.rcv	= brcm_tag_rcv,
};