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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2015, The Linux Foundation. All rights reserved.
4 */
5
6#include <linux/etherdevice.h>
7
8#include "dsa_priv.h"
9
10#define QCA_HDR_LEN 2
11#define QCA_HDR_VERSION 0x2
12
13#define QCA_HDR_RECV_VERSION_MASK GENMASK(15, 14)
14#define QCA_HDR_RECV_VERSION_S 14
15#define QCA_HDR_RECV_PRIORITY_MASK GENMASK(13, 11)
16#define QCA_HDR_RECV_PRIORITY_S 11
17#define QCA_HDR_RECV_TYPE_MASK GENMASK(10, 6)
18#define QCA_HDR_RECV_TYPE_S 6
19#define QCA_HDR_RECV_FRAME_IS_TAGGED BIT(3)
20#define QCA_HDR_RECV_SOURCE_PORT_MASK GENMASK(2, 0)
21
22#define QCA_HDR_XMIT_VERSION_MASK GENMASK(15, 14)
23#define QCA_HDR_XMIT_VERSION_S 14
24#define QCA_HDR_XMIT_PRIORITY_MASK GENMASK(13, 11)
25#define QCA_HDR_XMIT_PRIORITY_S 11
26#define QCA_HDR_XMIT_CONTROL_MASK GENMASK(10, 8)
27#define QCA_HDR_XMIT_CONTROL_S 8
28#define QCA_HDR_XMIT_FROM_CPU BIT(7)
29#define QCA_HDR_XMIT_DP_BIT_MASK GENMASK(6, 0)
30
31static struct sk_buff *qca_tag_xmit(struct sk_buff *skb, struct net_device *dev)
32{
33 struct dsa_port *dp = dsa_slave_to_port(dev);
34 __be16 *phdr;
35 u16 hdr;
36
37 skb_push(skb, QCA_HDR_LEN);
38
39 memmove(skb->data, skb->data + QCA_HDR_LEN, 2 * ETH_ALEN);
40 phdr = (__be16 *)(skb->data + 2 * ETH_ALEN);
41
42 /* Set the version field, and set destination port information */
43 hdr = QCA_HDR_VERSION << QCA_HDR_XMIT_VERSION_S |
44 QCA_HDR_XMIT_FROM_CPU | BIT(dp->index);
45
46 *phdr = htons(hdr);
47
48 return skb;
49}
50
51static struct sk_buff *qca_tag_rcv(struct sk_buff *skb, struct net_device *dev,
52 struct packet_type *pt)
53{
54 u8 ver;
55 u16 hdr;
56 int port;
57 __be16 *phdr;
58
59 if (unlikely(!pskb_may_pull(skb, QCA_HDR_LEN)))
60 return NULL;
61
62 /* The QCA header is added by the switch between src addr and Ethertype
63 * At this point, skb->data points to ethertype so header should be
64 * right before
65 */
66 phdr = (__be16 *)(skb->data - 2);
67 hdr = ntohs(*phdr);
68
69 /* Make sure the version is correct */
70 ver = (hdr & QCA_HDR_RECV_VERSION_MASK) >> QCA_HDR_RECV_VERSION_S;
71 if (unlikely(ver != QCA_HDR_VERSION))
72 return NULL;
73
74 /* Remove QCA tag and recalculate checksum */
75 skb_pull_rcsum(skb, QCA_HDR_LEN);
76 memmove(skb->data - ETH_HLEN, skb->data - ETH_HLEN - QCA_HDR_LEN,
77 ETH_HLEN - QCA_HDR_LEN);
78
79 /* Get source port information */
80 port = (hdr & QCA_HDR_RECV_SOURCE_PORT_MASK);
81
82 skb->dev = dsa_master_find_slave(dev, 0, port);
83 if (!skb->dev)
84 return NULL;
85
86 return skb;
87}
88
89static const struct dsa_device_ops qca_netdev_ops = {
90 .name = "qca",
91 .proto = DSA_TAG_PROTO_QCA,
92 .xmit = qca_tag_xmit,
93 .rcv = qca_tag_rcv,
94 .needed_headroom = QCA_HDR_LEN,
95};
96
97MODULE_LICENSE("GPL");
98MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_QCA);
99
100module_dsa_tag_driver(qca_netdev_ops);
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2015, The Linux Foundation. All rights reserved.
4 */
5
6#include <linux/etherdevice.h>
7#include <linux/bitfield.h>
8#include <net/dsa.h>
9#include <linux/dsa/tag_qca.h>
10
11#include "tag.h"
12
13#define QCA_NAME "qca"
14
15static struct sk_buff *qca_tag_xmit(struct sk_buff *skb, struct net_device *dev)
16{
17 struct dsa_port *dp = dsa_user_to_port(dev);
18 __be16 *phdr;
19 u16 hdr;
20
21 skb_push(skb, QCA_HDR_LEN);
22
23 dsa_alloc_etype_header(skb, QCA_HDR_LEN);
24 phdr = dsa_etype_header_pos_tx(skb);
25
26 /* Set the version field, and set destination port information */
27 hdr = FIELD_PREP(QCA_HDR_XMIT_VERSION, QCA_HDR_VERSION);
28 hdr |= QCA_HDR_XMIT_FROM_CPU;
29 hdr |= FIELD_PREP(QCA_HDR_XMIT_DP_BIT, BIT(dp->index));
30
31 *phdr = htons(hdr);
32
33 return skb;
34}
35
36static struct sk_buff *qca_tag_rcv(struct sk_buff *skb, struct net_device *dev)
37{
38 struct qca_tagger_data *tagger_data;
39 struct dsa_port *dp = dev->dsa_ptr;
40 struct dsa_switch *ds = dp->ds;
41 u8 ver, pk_type;
42 __be16 *phdr;
43 int port;
44 u16 hdr;
45
46 BUILD_BUG_ON(sizeof(struct qca_mgmt_ethhdr) != QCA_HDR_MGMT_HEADER_LEN + QCA_HDR_LEN);
47
48 tagger_data = ds->tagger_data;
49
50 if (unlikely(!pskb_may_pull(skb, QCA_HDR_LEN)))
51 return NULL;
52
53 phdr = dsa_etype_header_pos_rx(skb);
54 hdr = ntohs(*phdr);
55
56 /* Make sure the version is correct */
57 ver = FIELD_GET(QCA_HDR_RECV_VERSION, hdr);
58 if (unlikely(ver != QCA_HDR_VERSION))
59 return NULL;
60
61 /* Get pk type */
62 pk_type = FIELD_GET(QCA_HDR_RECV_TYPE, hdr);
63
64 /* Ethernet mgmt read/write packet */
65 if (pk_type == QCA_HDR_RECV_TYPE_RW_REG_ACK) {
66 if (likely(tagger_data->rw_reg_ack_handler))
67 tagger_data->rw_reg_ack_handler(ds, skb);
68 return NULL;
69 }
70
71 /* Ethernet MIB counter packet */
72 if (pk_type == QCA_HDR_RECV_TYPE_MIB) {
73 if (likely(tagger_data->mib_autocast_handler))
74 tagger_data->mib_autocast_handler(ds, skb);
75 return NULL;
76 }
77
78 /* Get source port information */
79 port = FIELD_GET(QCA_HDR_RECV_SOURCE_PORT, hdr);
80
81 skb->dev = dsa_conduit_find_user(dev, 0, port);
82 if (!skb->dev)
83 return NULL;
84
85 /* Remove QCA tag and recalculate checksum */
86 skb_pull_rcsum(skb, QCA_HDR_LEN);
87 dsa_strip_etype_header(skb, QCA_HDR_LEN);
88
89 return skb;
90}
91
92static int qca_tag_connect(struct dsa_switch *ds)
93{
94 struct qca_tagger_data *tagger_data;
95
96 tagger_data = kzalloc(sizeof(*tagger_data), GFP_KERNEL);
97 if (!tagger_data)
98 return -ENOMEM;
99
100 ds->tagger_data = tagger_data;
101
102 return 0;
103}
104
105static void qca_tag_disconnect(struct dsa_switch *ds)
106{
107 kfree(ds->tagger_data);
108 ds->tagger_data = NULL;
109}
110
111static const struct dsa_device_ops qca_netdev_ops = {
112 .name = QCA_NAME,
113 .proto = DSA_TAG_PROTO_QCA,
114 .connect = qca_tag_connect,
115 .disconnect = qca_tag_disconnect,
116 .xmit = qca_tag_xmit,
117 .rcv = qca_tag_rcv,
118 .needed_headroom = QCA_HDR_LEN,
119 .promisc_on_conduit = true,
120};
121
122MODULE_DESCRIPTION("DSA tag driver for Qualcomm Atheros QCA8K switches");
123MODULE_LICENSE("GPL");
124MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_QCA, QCA_NAME);
125
126module_dsa_tag_driver(qca_netdev_ops);