Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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 __be16 *phdr;
18 u16 hdr;
19
20 skb_push(skb, QCA_HDR_LEN);
21
22 dsa_alloc_etype_header(skb, QCA_HDR_LEN);
23 phdr = dsa_etype_header_pos_tx(skb);
24
25 /* Set the version field, and set destination port information */
26 hdr = FIELD_PREP(QCA_HDR_XMIT_VERSION, QCA_HDR_VERSION);
27 hdr |= QCA_HDR_XMIT_FROM_CPU;
28 hdr |= FIELD_PREP(QCA_HDR_XMIT_DP_BIT, dsa_xmit_port_mask(skb, dev));
29
30 *phdr = htons(hdr);
31
32 return skb;
33}
34
35static struct sk_buff *qca_tag_rcv(struct sk_buff *skb, struct net_device *dev)
36{
37 struct qca_tagger_data *tagger_data;
38 struct dsa_port *dp = dev->dsa_ptr;
39 struct dsa_switch *ds = dp->ds;
40 u8 ver, pk_type;
41 __be16 *phdr;
42 int port;
43 u16 hdr;
44
45 BUILD_BUG_ON(sizeof(struct qca_mgmt_ethhdr) != QCA_HDR_MGMT_HEADER_LEN + QCA_HDR_LEN);
46
47 tagger_data = ds->tagger_data;
48
49 if (unlikely(!pskb_may_pull(skb, QCA_HDR_LEN)))
50 return NULL;
51
52 phdr = dsa_etype_header_pos_rx(skb);
53 hdr = ntohs(*phdr);
54
55 /* Make sure the version is correct */
56 ver = FIELD_GET(QCA_HDR_RECV_VERSION, hdr);
57 if (unlikely(ver != QCA_HDR_VERSION))
58 return NULL;
59
60 /* Get pk type */
61 pk_type = FIELD_GET(QCA_HDR_RECV_TYPE, hdr);
62
63 /* Ethernet mgmt read/write packet */
64 if (pk_type == QCA_HDR_RECV_TYPE_RW_REG_ACK) {
65 if (likely(tagger_data->rw_reg_ack_handler))
66 tagger_data->rw_reg_ack_handler(ds, skb);
67 return NULL;
68 }
69
70 /* Ethernet MIB counter packet */
71 if (pk_type == QCA_HDR_RECV_TYPE_MIB) {
72 if (likely(tagger_data->mib_autocast_handler))
73 tagger_data->mib_autocast_handler(ds, skb);
74 return NULL;
75 }
76
77 /* Get source port information */
78 port = FIELD_GET(QCA_HDR_RECV_SOURCE_PORT, hdr);
79
80 skb->dev = dsa_conduit_find_user(dev, 0, port);
81 if (!skb->dev)
82 return NULL;
83
84 /* Remove QCA tag and recalculate checksum */
85 skb_pull_rcsum(skb, QCA_HDR_LEN);
86 dsa_strip_etype_header(skb, QCA_HDR_LEN);
87
88 return skb;
89}
90
91static int qca_tag_connect(struct dsa_switch *ds)
92{
93 struct qca_tagger_data *tagger_data;
94
95 tagger_data = kzalloc(sizeof(*tagger_data), GFP_KERNEL);
96 if (!tagger_data)
97 return -ENOMEM;
98
99 ds->tagger_data = tagger_data;
100
101 return 0;
102}
103
104static void qca_tag_disconnect(struct dsa_switch *ds)
105{
106 kfree(ds->tagger_data);
107 ds->tagger_data = NULL;
108}
109
110static const struct dsa_device_ops qca_netdev_ops = {
111 .name = QCA_NAME,
112 .proto = DSA_TAG_PROTO_QCA,
113 .connect = qca_tag_connect,
114 .disconnect = qca_tag_disconnect,
115 .xmit = qca_tag_xmit,
116 .rcv = qca_tag_rcv,
117 .needed_headroom = QCA_HDR_LEN,
118 .promisc_on_conduit = true,
119};
120
121MODULE_DESCRIPTION("DSA tag driver for Qualcomm Atheros QCA8K switches");
122MODULE_LICENSE("GPL");
123MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_QCA, QCA_NAME);
124
125module_dsa_tag_driver(qca_netdev_ops);