tjh.dev
Linux kernel mirror (for testing)
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linux
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * net/dsa/tag_ksz.c - Microchip KSZ Switch tag format handling
4 * Copyright (c) 2017 Microchip Technology
5 */
6
7#include <linux/etherdevice.h>
8#include <linux/list.h>
9#include <net/dsa.h>
10
11#include "tag.h"
12
13#define KSZ8795_NAME "ksz8795"
14#define KSZ9477_NAME "ksz9477"
15#define KSZ9893_NAME "ksz9893"
16#define LAN937X_NAME "lan937x"
17
18/* Typically only one byte is used for tail tag. */
19#define KSZ_EGRESS_TAG_LEN 1
20#define KSZ_INGRESS_TAG_LEN 1
21
22static struct sk_buff *ksz_common_rcv(struct sk_buff *skb,
23 struct net_device *dev,
24 unsigned int port, unsigned int len)
25{
26 skb->dev = dsa_master_find_slave(dev, 0, port);
27 if (!skb->dev)
28 return NULL;
29
30 if (pskb_trim_rcsum(skb, skb->len - len))
31 return NULL;
32
33 dsa_default_offload_fwd_mark(skb);
34
35 return skb;
36}
37
38/*
39 * For Ingress (Host -> KSZ8795), 1 byte is added before FCS.
40 * ---------------------------------------------------------------------------
41 * DA(6bytes)|SA(6bytes)|....|Data(nbytes)|tag(1byte)|FCS(4bytes)
42 * ---------------------------------------------------------------------------
43 * tag : each bit represents port (eg, 0x01=port1, 0x02=port2, 0x10=port5)
44 *
45 * For Egress (KSZ8795 -> Host), 1 byte is added before FCS.
46 * ---------------------------------------------------------------------------
47 * DA(6bytes)|SA(6bytes)|....|Data(nbytes)|tag0(1byte)|FCS(4bytes)
48 * ---------------------------------------------------------------------------
49 * tag0 : zero-based value represents port
50 * (eg, 0x00=port1, 0x02=port3, 0x06=port7)
51 */
52
53#define KSZ8795_TAIL_TAG_OVERRIDE BIT(6)
54#define KSZ8795_TAIL_TAG_LOOKUP BIT(7)
55
56static struct sk_buff *ksz8795_xmit(struct sk_buff *skb, struct net_device *dev)
57{
58 struct dsa_port *dp = dsa_slave_to_port(dev);
59 u8 *tag;
60 u8 *addr;
61
62 if (skb->ip_summed == CHECKSUM_PARTIAL && skb_checksum_help(skb))
63 return NULL;
64
65 /* Tag encoding */
66 tag = skb_put(skb, KSZ_INGRESS_TAG_LEN);
67 addr = skb_mac_header(skb);
68
69 *tag = 1 << dp->index;
70 if (is_link_local_ether_addr(addr))
71 *tag |= KSZ8795_TAIL_TAG_OVERRIDE;
72
73 return skb;
74}
75
76static struct sk_buff *ksz8795_rcv(struct sk_buff *skb, struct net_device *dev)
77{
78 u8 *tag = skb_tail_pointer(skb) - KSZ_EGRESS_TAG_LEN;
79
80 return ksz_common_rcv(skb, dev, tag[0] & 7, KSZ_EGRESS_TAG_LEN);
81}
82
83static const struct dsa_device_ops ksz8795_netdev_ops = {
84 .name = KSZ8795_NAME,
85 .proto = DSA_TAG_PROTO_KSZ8795,
86 .xmit = ksz8795_xmit,
87 .rcv = ksz8795_rcv,
88 .needed_tailroom = KSZ_INGRESS_TAG_LEN,
89};
90
91DSA_TAG_DRIVER(ksz8795_netdev_ops);
92MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_KSZ8795, KSZ8795_NAME);
93
94/*
95 * For Ingress (Host -> KSZ9477), 2 bytes are added before FCS.
96 * ---------------------------------------------------------------------------
97 * DA(6bytes)|SA(6bytes)|....|Data(nbytes)|tag0(1byte)|tag1(1byte)|FCS(4bytes)
98 * ---------------------------------------------------------------------------
99 * tag0 : Prioritization (not used now)
100 * tag1 : each bit represents port (eg, 0x01=port1, 0x02=port2, 0x10=port5)
101 *
102 * For Egress (KSZ9477 -> Host), 1 byte is added before FCS.
103 * ---------------------------------------------------------------------------
104 * DA(6bytes)|SA(6bytes)|....|Data(nbytes)|tag0(1byte)|FCS(4bytes)
105 * ---------------------------------------------------------------------------
106 * tag0 : zero-based value represents port
107 * (eg, 0x00=port1, 0x02=port3, 0x06=port7)
108 */
109
110#define KSZ9477_INGRESS_TAG_LEN 2
111#define KSZ9477_PTP_TAG_LEN 4
112#define KSZ9477_PTP_TAG_INDICATION 0x80
113
114#define KSZ9477_TAIL_TAG_OVERRIDE BIT(9)
115#define KSZ9477_TAIL_TAG_LOOKUP BIT(10)
116
117static struct sk_buff *ksz9477_xmit(struct sk_buff *skb,
118 struct net_device *dev)
119{
120 struct dsa_port *dp = dsa_slave_to_port(dev);
121 __be16 *tag;
122 u8 *addr;
123 u16 val;
124
125 if (skb->ip_summed == CHECKSUM_PARTIAL && skb_checksum_help(skb))
126 return NULL;
127
128 /* Tag encoding */
129 tag = skb_put(skb, KSZ9477_INGRESS_TAG_LEN);
130 addr = skb_mac_header(skb);
131
132 val = BIT(dp->index);
133
134 if (is_link_local_ether_addr(addr))
135 val |= KSZ9477_TAIL_TAG_OVERRIDE;
136
137 *tag = cpu_to_be16(val);
138
139 return skb;
140}
141
142static struct sk_buff *ksz9477_rcv(struct sk_buff *skb, struct net_device *dev)
143{
144 /* Tag decoding */
145 u8 *tag = skb_tail_pointer(skb) - KSZ_EGRESS_TAG_LEN;
146 unsigned int port = tag[0] & 7;
147 unsigned int len = KSZ_EGRESS_TAG_LEN;
148
149 /* Extra 4-bytes PTP timestamp */
150 if (tag[0] & KSZ9477_PTP_TAG_INDICATION)
151 len += KSZ9477_PTP_TAG_LEN;
152
153 return ksz_common_rcv(skb, dev, port, len);
154}
155
156static const struct dsa_device_ops ksz9477_netdev_ops = {
157 .name = KSZ9477_NAME,
158 .proto = DSA_TAG_PROTO_KSZ9477,
159 .xmit = ksz9477_xmit,
160 .rcv = ksz9477_rcv,
161 .needed_tailroom = KSZ9477_INGRESS_TAG_LEN,
162};
163
164DSA_TAG_DRIVER(ksz9477_netdev_ops);
165MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_KSZ9477, KSZ9477_NAME);
166
167#define KSZ9893_TAIL_TAG_OVERRIDE BIT(5)
168#define KSZ9893_TAIL_TAG_LOOKUP BIT(6)
169
170static struct sk_buff *ksz9893_xmit(struct sk_buff *skb,
171 struct net_device *dev)
172{
173 struct dsa_port *dp = dsa_slave_to_port(dev);
174 u8 *addr;
175 u8 *tag;
176
177 if (skb->ip_summed == CHECKSUM_PARTIAL && skb_checksum_help(skb))
178 return NULL;
179
180 /* Tag encoding */
181 tag = skb_put(skb, KSZ_INGRESS_TAG_LEN);
182 addr = skb_mac_header(skb);
183
184 *tag = BIT(dp->index);
185
186 if (is_link_local_ether_addr(addr))
187 *tag |= KSZ9893_TAIL_TAG_OVERRIDE;
188
189 return skb;
190}
191
192static const struct dsa_device_ops ksz9893_netdev_ops = {
193 .name = KSZ9893_NAME,
194 .proto = DSA_TAG_PROTO_KSZ9893,
195 .xmit = ksz9893_xmit,
196 .rcv = ksz9477_rcv,
197 .needed_tailroom = KSZ_INGRESS_TAG_LEN,
198};
199
200DSA_TAG_DRIVER(ksz9893_netdev_ops);
201MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_KSZ9893, KSZ9893_NAME);
202
203/* For xmit, 2 bytes are added before FCS.
204 * ---------------------------------------------------------------------------
205 * DA(6bytes)|SA(6bytes)|....|Data(nbytes)|tag0(1byte)|tag1(1byte)|FCS(4bytes)
206 * ---------------------------------------------------------------------------
207 * tag0 : represents tag override, lookup and valid
208 * tag1 : each bit represents port (eg, 0x01=port1, 0x02=port2, 0x80=port8)
209 *
210 * For rcv, 1 byte is added before FCS.
211 * ---------------------------------------------------------------------------
212 * DA(6bytes)|SA(6bytes)|....|Data(nbytes)|tag0(1byte)|FCS(4bytes)
213 * ---------------------------------------------------------------------------
214 * tag0 : zero-based value represents port
215 * (eg, 0x00=port1, 0x02=port3, 0x07=port8)
216 */
217#define LAN937X_EGRESS_TAG_LEN 2
218
219#define LAN937X_TAIL_TAG_BLOCKING_OVERRIDE BIT(11)
220#define LAN937X_TAIL_TAG_LOOKUP BIT(12)
221#define LAN937X_TAIL_TAG_VALID BIT(13)
222#define LAN937X_TAIL_TAG_PORT_MASK 7
223
224static struct sk_buff *lan937x_xmit(struct sk_buff *skb,
225 struct net_device *dev)
226{
227 struct dsa_port *dp = dsa_slave_to_port(dev);
228 const struct ethhdr *hdr = eth_hdr(skb);
229 __be16 *tag;
230 u16 val;
231
232 if (skb->ip_summed == CHECKSUM_PARTIAL && skb_checksum_help(skb))
233 return NULL;
234
235 tag = skb_put(skb, LAN937X_EGRESS_TAG_LEN);
236
237 val = BIT(dp->index);
238
239 if (is_link_local_ether_addr(hdr->h_dest))
240 val |= LAN937X_TAIL_TAG_BLOCKING_OVERRIDE;
241
242 /* Tail tag valid bit - This bit should always be set by the CPU */
243 val |= LAN937X_TAIL_TAG_VALID;
244
245 put_unaligned_be16(val, tag);
246
247 return skb;
248}
249
250static const struct dsa_device_ops lan937x_netdev_ops = {
251 .name = LAN937X_NAME,
252 .proto = DSA_TAG_PROTO_LAN937X,
253 .xmit = lan937x_xmit,
254 .rcv = ksz9477_rcv,
255 .needed_tailroom = LAN937X_EGRESS_TAG_LEN,
256};
257
258DSA_TAG_DRIVER(lan937x_netdev_ops);
259MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_LAN937X, LAN937X_NAME);
260
261static struct dsa_tag_driver *dsa_tag_driver_array[] = {
262 &DSA_TAG_DRIVER_NAME(ksz8795_netdev_ops),
263 &DSA_TAG_DRIVER_NAME(ksz9477_netdev_ops),
264 &DSA_TAG_DRIVER_NAME(ksz9893_netdev_ops),
265 &DSA_TAG_DRIVER_NAME(lan937x_netdev_ops),
266};
267
268module_dsa_tag_drivers(dsa_tag_driver_array);
269
270MODULE_LICENSE("GPL");