tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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
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 dsa_alloc_etype_header(skb, QCA_HDR_LEN);
40 phdr = dsa_etype_header_pos_tx(skb);
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{
53 u8 ver;
54 u16 hdr;
55 int port;
56 __be16 *phdr;
57
58 if (unlikely(!pskb_may_pull(skb, QCA_HDR_LEN)))
59 return NULL;
60
61 phdr = dsa_etype_header_pos_rx(skb);
62 hdr = ntohs(*phdr);
63
64 /* Make sure the version is correct */
65 ver = (hdr & QCA_HDR_RECV_VERSION_MASK) >> QCA_HDR_RECV_VERSION_S;
66 if (unlikely(ver != QCA_HDR_VERSION))
67 return NULL;
68
69 /* Remove QCA tag and recalculate checksum */
70 skb_pull_rcsum(skb, QCA_HDR_LEN);
71 dsa_strip_etype_header(skb, QCA_HDR_LEN);
72
73 /* Get source port information */
74 port = (hdr & QCA_HDR_RECV_SOURCE_PORT_MASK);
75
76 skb->dev = dsa_master_find_slave(dev, 0, port);
77 if (!skb->dev)
78 return NULL;
79
80 return skb;
81}
82
83static const struct dsa_device_ops qca_netdev_ops = {
84 .name = "qca",
85 .proto = DSA_TAG_PROTO_QCA,
86 .xmit = qca_tag_xmit,
87 .rcv = qca_tag_rcv,
88 .needed_headroom = QCA_HDR_LEN,
89};
90
91MODULE_LICENSE("GPL");
92MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_QCA);
93
94module_dsa_tag_driver(qca_netdev_ops);