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11#include <linux/etherdevice.h>
12#include <linux/list.h>
13#include <linux/netdevice.h>
14#include "dsa_priv.h"
15
16#define DSA_HLEN 4
17
18netdev_tx_t dsa_xmit(struct sk_buff *skb, struct net_device *dev)
19{
20 struct dsa_slave_priv *p = netdev_priv(dev);
21 u8 *dsa_header;
22
23 dev->stats.tx_packets++;
24 dev->stats.tx_bytes += skb->len;
25
26
27
28
29
30
31 if (skb->protocol == htons(ETH_P_8021Q)) {
32 if (skb_cow_head(skb, 0) < 0)
33 goto out_free;
34
35
36
37
38 dsa_header = skb->data + 2 * ETH_ALEN;
39 dsa_header[0] = 0x60 | p->parent->index;
40 dsa_header[1] = p->port << 3;
41
42
43
44
45 if (dsa_header[2] & 0x10) {
46 dsa_header[1] |= 0x01;
47 dsa_header[2] &= ~0x10;
48 }
49 } else {
50 if (skb_cow_head(skb, DSA_HLEN) < 0)
51 goto out_free;
52 skb_push(skb, DSA_HLEN);
53
54 memmove(skb->data, skb->data + DSA_HLEN, 2 * ETH_ALEN);
55
56
57
58
59 dsa_header = skb->data + 2 * ETH_ALEN;
60 dsa_header[0] = 0x40 | p->parent->index;
61 dsa_header[1] = p->port << 3;
62 dsa_header[2] = 0x00;
63 dsa_header[3] = 0x00;
64 }
65
66 skb->protocol = htons(ETH_P_DSA);
67
68 skb->dev = p->parent->dst->master_netdev;
69 dev_queue_xmit(skb);
70
71 return NETDEV_TX_OK;
72
73out_free:
74 kfree_skb(skb);
75 return NETDEV_TX_OK;
76}
77
78static int dsa_rcv(struct sk_buff *skb, struct net_device *dev,
79 struct packet_type *pt, struct net_device *orig_dev)
80{
81 struct dsa_switch_tree *dst = dev->dsa_ptr;
82 struct dsa_switch *ds;
83 u8 *dsa_header;
84 int source_device;
85 int source_port;
86
87 if (unlikely(dst == NULL))
88 goto out_drop;
89
90 skb = skb_unshare(skb, GFP_ATOMIC);
91 if (skb == NULL)
92 goto out;
93
94 if (unlikely(!pskb_may_pull(skb, DSA_HLEN)))
95 goto out_drop;
96
97
98
99
100 dsa_header = skb->data - 2;
101
102
103
104
105 if ((dsa_header[0] & 0xc0) != 0x00 && (dsa_header[0] & 0xc0) != 0xc0)
106 goto out_drop;
107
108
109
110
111 source_device = dsa_header[0] & 0x1f;
112 source_port = (dsa_header[1] >> 3) & 0x1f;
113
114
115
116
117
118 if (source_device >= dst->pd->nr_chips)
119 goto out_drop;
120 ds = dst->ds[source_device];
121 if (source_port >= DSA_MAX_PORTS || ds->ports[source_port] == NULL)
122 goto out_drop;
123
124
125
126
127
128
129 if (dsa_header[0] & 0x20) {
130 u8 new_header[4];
131
132
133
134
135
136
137 new_header[0] = (ETH_P_8021Q >> 8) & 0xff;
138 new_header[1] = ETH_P_8021Q & 0xff;
139 new_header[2] = dsa_header[2] & ~0x10;
140 new_header[3] = dsa_header[3];
141
142
143
144
145
146 if (dsa_header[1] & 0x01)
147 new_header[2] |= 0x10;
148
149
150
151
152 if (skb->ip_summed == CHECKSUM_COMPLETE) {
153 __wsum c = skb->csum;
154 c = csum_add(c, csum_partial(new_header + 2, 2, 0));
155 c = csum_sub(c, csum_partial(dsa_header + 2, 2, 0));
156 skb->csum = c;
157 }
158
159 memcpy(dsa_header, new_header, DSA_HLEN);
160 } else {
161
162
163
164 skb_pull_rcsum(skb, DSA_HLEN);
165 memmove(skb->data - ETH_HLEN,
166 skb->data - ETH_HLEN - DSA_HLEN,
167 2 * ETH_ALEN);
168 }
169
170 skb->dev = ds->ports[source_port];
171 skb_push(skb, ETH_HLEN);
172 skb->pkt_type = PACKET_HOST;
173 skb->protocol = eth_type_trans(skb, skb->dev);
174
175 skb->dev->stats.rx_packets++;
176 skb->dev->stats.rx_bytes += skb->len;
177
178 netif_receive_skb(skb);
179
180 return 0;
181
182out_drop:
183 kfree_skb(skb);
184out:
185 return 0;
186}
187
188static struct packet_type dsa_packet_type __read_mostly = {
189 .type = cpu_to_be16(ETH_P_DSA),
190 .func = dsa_rcv,
191};
192
193static int __init dsa_init_module(void)
194{
195 dev_add_pack(&dsa_packet_type);
196 return 0;
197}
198module_init(dsa_init_module);
199
200static void __exit dsa_cleanup_module(void)
201{
202 dev_remove_pack(&dsa_packet_type);
203}
204module_exit(dsa_cleanup_module);
205