Loading...
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);
1/*
2 * Copyright (c) 2015, The Linux Foundation. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 and
6 * only version 2 as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 */
13
14#include <linux/etherdevice.h>
15
16#include "dsa_priv.h"
17
18#define QCA_HDR_LEN 2
19#define QCA_HDR_VERSION 0x2
20
21#define QCA_HDR_RECV_VERSION_MASK GENMASK(15, 14)
22#define QCA_HDR_RECV_VERSION_S 14
23#define QCA_HDR_RECV_PRIORITY_MASK GENMASK(13, 11)
24#define QCA_HDR_RECV_PRIORITY_S 11
25#define QCA_HDR_RECV_TYPE_MASK GENMASK(10, 6)
26#define QCA_HDR_RECV_TYPE_S 6
27#define QCA_HDR_RECV_FRAME_IS_TAGGED BIT(3)
28#define QCA_HDR_RECV_SOURCE_PORT_MASK GENMASK(2, 0)
29
30#define QCA_HDR_XMIT_VERSION_MASK GENMASK(15, 14)
31#define QCA_HDR_XMIT_VERSION_S 14
32#define QCA_HDR_XMIT_PRIORITY_MASK GENMASK(13, 11)
33#define QCA_HDR_XMIT_PRIORITY_S 11
34#define QCA_HDR_XMIT_CONTROL_MASK GENMASK(10, 8)
35#define QCA_HDR_XMIT_CONTROL_S 8
36#define QCA_HDR_XMIT_FROM_CPU BIT(7)
37#define QCA_HDR_XMIT_DP_BIT_MASK GENMASK(6, 0)
38
39static struct sk_buff *qca_tag_xmit(struct sk_buff *skb, struct net_device *dev)
40{
41 struct dsa_port *dp = dsa_slave_to_port(dev);
42 u16 *phdr, hdr;
43
44 dev->stats.tx_packets++;
45 dev->stats.tx_bytes += skb->len;
46
47 if (skb_cow_head(skb, 0) < 0)
48 return NULL;
49
50 skb_push(skb, QCA_HDR_LEN);
51
52 memmove(skb->data, skb->data + QCA_HDR_LEN, 2 * ETH_ALEN);
53 phdr = (u16 *)(skb->data + 2 * ETH_ALEN);
54
55 /* Set the version field, and set destination port information */
56 hdr = QCA_HDR_VERSION << QCA_HDR_XMIT_VERSION_S |
57 QCA_HDR_XMIT_FROM_CPU | BIT(dp->index);
58
59 *phdr = htons(hdr);
60
61 return skb;
62}
63
64static struct sk_buff *qca_tag_rcv(struct sk_buff *skb, struct net_device *dev,
65 struct packet_type *pt)
66{
67 u8 ver;
68 int port;
69 __be16 *phdr, hdr;
70
71 if (unlikely(!pskb_may_pull(skb, QCA_HDR_LEN)))
72 return NULL;
73
74 /* The QCA header is added by the switch between src addr and Ethertype
75 * At this point, skb->data points to ethertype so header should be
76 * right before
77 */
78 phdr = (__be16 *)(skb->data - 2);
79 hdr = ntohs(*phdr);
80
81 /* Make sure the version is correct */
82 ver = (hdr & QCA_HDR_RECV_VERSION_MASK) >> QCA_HDR_RECV_VERSION_S;
83 if (unlikely(ver != QCA_HDR_VERSION))
84 return NULL;
85
86 /* Remove QCA tag and recalculate checksum */
87 skb_pull_rcsum(skb, QCA_HDR_LEN);
88 memmove(skb->data - ETH_HLEN, skb->data - ETH_HLEN - QCA_HDR_LEN,
89 ETH_HLEN - QCA_HDR_LEN);
90
91 /* Get source port information */
92 port = (hdr & QCA_HDR_RECV_SOURCE_PORT_MASK);
93
94 skb->dev = dsa_master_find_slave(dev, 0, port);
95 if (!skb->dev)
96 return NULL;
97
98 return skb;
99}
100
101const struct dsa_device_ops qca_netdev_ops = {
102 .xmit = qca_tag_xmit,
103 .rcv = qca_tag_rcv,
104};