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7#include <linux/etherdevice.h>
8#include <linux/list.h>
9#include <linux/slab.h>
10#include <net/dsa.h>
11#include "dsa_priv.h"
12
13
14#define KSZ_EGRESS_TAG_LEN 1
15#define KSZ_INGRESS_TAG_LEN 1
16
17static struct sk_buff *ksz_common_xmit(struct sk_buff *skb,
18 struct net_device *dev, int len)
19{
20 struct sk_buff *nskb;
21 int padlen;
22
23 padlen = (skb->len >= ETH_ZLEN) ? 0 : ETH_ZLEN - skb->len;
24
25 if (skb_tailroom(skb) >= padlen + len) {
26
27 if (__skb_put_padto(skb, skb->len + padlen, false))
28 return NULL;
29
30 nskb = skb;
31 } else {
32 nskb = alloc_skb(NET_IP_ALIGN + skb->len +
33 padlen + len, GFP_ATOMIC);
34 if (!nskb)
35 return NULL;
36 skb_reserve(nskb, NET_IP_ALIGN);
37
38 skb_reset_mac_header(nskb);
39 skb_set_network_header(nskb,
40 skb_network_header(skb) - skb->head);
41 skb_set_transport_header(nskb,
42 skb_transport_header(skb) - skb->head);
43 skb_copy_and_csum_dev(skb, skb_put(nskb, skb->len));
44
45
46
47
48 if (skb_put_padto(nskb, nskb->len + padlen))
49 return NULL;
50
51 consume_skb(skb);
52 }
53
54 return nskb;
55}
56
57static struct sk_buff *ksz_common_rcv(struct sk_buff *skb,
58 struct net_device *dev,
59 unsigned int port, unsigned int len)
60{
61 skb->dev = dsa_master_find_slave(dev, 0, port);
62 if (!skb->dev)
63 return NULL;
64
65 pskb_trim_rcsum(skb, skb->len - len);
66
67 skb->offload_fwd_mark = true;
68
69 return skb;
70}
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87
88#define KSZ9477_INGRESS_TAG_LEN 2
89#define KSZ9477_PTP_TAG_LEN 4
90#define KSZ9477_PTP_TAG_INDICATION 0x80
91
92#define KSZ9477_TAIL_TAG_OVERRIDE BIT(9)
93#define KSZ9477_TAIL_TAG_LOOKUP BIT(10)
94
95static struct sk_buff *ksz9477_xmit(struct sk_buff *skb,
96 struct net_device *dev)
97{
98 struct dsa_port *dp = dsa_slave_to_port(dev);
99 struct sk_buff *nskb;
100 u16 *tag;
101 u8 *addr;
102
103 nskb = ksz_common_xmit(skb, dev, KSZ9477_INGRESS_TAG_LEN);
104 if (!nskb)
105 return NULL;
106
107
108 tag = skb_put(nskb, KSZ9477_INGRESS_TAG_LEN);
109 addr = skb_mac_header(nskb);
110
111 *tag = BIT(dp->index);
112
113 if (is_link_local_ether_addr(addr))
114 *tag |= KSZ9477_TAIL_TAG_OVERRIDE;
115
116 *tag = cpu_to_be16(*tag);
117
118 return nskb;
119}
120
121static struct sk_buff *ksz9477_rcv(struct sk_buff *skb, struct net_device *dev,
122 struct packet_type *pt)
123{
124
125 u8 *tag = skb_tail_pointer(skb) - KSZ_EGRESS_TAG_LEN;
126 unsigned int port = tag[0] & 7;
127 unsigned int len = KSZ_EGRESS_TAG_LEN;
128
129
130 if (tag[0] & KSZ9477_PTP_TAG_INDICATION)
131 len += KSZ9477_PTP_TAG_LEN;
132
133 return ksz_common_rcv(skb, dev, port, len);
134}
135
136static const struct dsa_device_ops ksz9477_netdev_ops = {
137 .name = "ksz9477",
138 .proto = DSA_TAG_PROTO_KSZ9477,
139 .xmit = ksz9477_xmit,
140 .rcv = ksz9477_rcv,
141 .overhead = KSZ9477_INGRESS_TAG_LEN,
142};
143
144DSA_TAG_DRIVER(ksz9477_netdev_ops);
145MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_KSZ9477);
146
147#define KSZ9893_TAIL_TAG_OVERRIDE BIT(5)
148#define KSZ9893_TAIL_TAG_LOOKUP BIT(6)
149
150static struct sk_buff *ksz9893_xmit(struct sk_buff *skb,
151 struct net_device *dev)
152{
153 struct dsa_port *dp = dsa_slave_to_port(dev);
154 struct sk_buff *nskb;
155 u8 *addr;
156 u8 *tag;
157
158 nskb = ksz_common_xmit(skb, dev, KSZ_INGRESS_TAG_LEN);
159 if (!nskb)
160 return NULL;
161
162
163 tag = skb_put(nskb, KSZ_INGRESS_TAG_LEN);
164 addr = skb_mac_header(nskb);
165
166 *tag = BIT(dp->index);
167
168 if (is_link_local_ether_addr(addr))
169 *tag |= KSZ9893_TAIL_TAG_OVERRIDE;
170
171 return nskb;
172}
173
174static const struct dsa_device_ops ksz9893_netdev_ops = {
175 .name = "ksz9893",
176 .proto = DSA_TAG_PROTO_KSZ9893,
177 .xmit = ksz9893_xmit,
178 .rcv = ksz9477_rcv,
179 .overhead = KSZ_INGRESS_TAG_LEN,
180};
181
182DSA_TAG_DRIVER(ksz9893_netdev_ops);
183MODULE_ALIAS_DSA_TAG_DRIVER(DSA_TAG_PROTO_KSZ9893);
184
185static struct dsa_tag_driver *dsa_tag_driver_array[] = {
186 &DSA_TAG_DRIVER_NAME(ksz9477_netdev_ops),
187 &DSA_TAG_DRIVER_NAME(ksz9893_netdev_ops),
188};
189
190module_dsa_tag_drivers(dsa_tag_driver_array);
191
192MODULE_LICENSE("GPL");
193