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1 | /* |
2 | * net/dsa/tag_dsa.c - (Non-ethertype) DSA tagging |
3 | * Copyright (c) 2008-2009 Marvell Semiconductor |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License as published by |
7 | * the Free Software Foundation; either version 2 of the License, or |
8 | * (at your option) any later version. |
9 | */ |
10 | |
11 | #include <linux/etherdevice.h> |
12 | #include <linux/list.h> |
13 | #include <linux/netdevice.h> |
14 | #include <linux/slab.h> |
15 | #include "dsa_priv.h" |
16 | |
17 | #define DSA_HLEN 4 |
18 | |
19 | netdev_tx_t dsa_xmit(struct sk_buff *skb, struct net_device *dev) |
20 | { |
21 | struct dsa_slave_priv *p = netdev_priv(dev); |
22 | u8 *dsa_header; |
23 | |
24 | dev->stats.tx_packets++; |
25 | dev->stats.tx_bytes += skb->len; |
26 | |
27 | /* |
28 | * Convert the outermost 802.1q tag to a DSA tag for tagged |
29 | * packets, or insert a DSA tag between the addresses and |
30 | * the ethertype field for untagged packets. |
31 | */ |
32 | if (skb->protocol == htons(ETH_P_8021Q)) { |
33 | if (skb_cow_head(skb, 0) < 0) |
34 | goto out_free; |
35 | |
36 | /* |
37 | * Construct tagged FROM_CPU DSA tag from 802.1q tag. |
38 | */ |
39 | dsa_header = skb->data + 2 * ETH_ALEN; |
40 | dsa_header[0] = 0x60 | p->parent->index; |
41 | dsa_header[1] = p->port << 3; |
42 | |
43 | /* |
44 | * Move CFI field from byte 2 to byte 1. |
45 | */ |
46 | if (dsa_header[2] & 0x10) { |
47 | dsa_header[1] |= 0x01; |
48 | dsa_header[2] &= ~0x10; |
49 | } |
50 | } else { |
51 | if (skb_cow_head(skb, DSA_HLEN) < 0) |
52 | goto out_free; |
53 | skb_push(skb, DSA_HLEN); |
54 | |
55 | memmove(skb->data, skb->data + DSA_HLEN, 2 * ETH_ALEN); |
56 | |
57 | /* |
58 | * Construct untagged FROM_CPU DSA tag. |
59 | */ |
60 | dsa_header = skb->data + 2 * ETH_ALEN; |
61 | dsa_header[0] = 0x40 | p->parent->index; |
62 | dsa_header[1] = p->port << 3; |
63 | dsa_header[2] = 0x00; |
64 | dsa_header[3] = 0x00; |
65 | } |
66 | |
67 | skb->protocol = htons(ETH_P_DSA); |
68 | |
69 | skb->dev = p->parent->dst->master_netdev; |
70 | dev_queue_xmit(skb); |
71 | |
72 | return NETDEV_TX_OK; |
73 | |
74 | out_free: |
75 | kfree_skb(skb); |
76 | return NETDEV_TX_OK; |
77 | } |
78 | |
79 | static int dsa_rcv(struct sk_buff *skb, struct net_device *dev, |
80 | struct packet_type *pt, struct net_device *orig_dev) |
81 | { |
82 | struct dsa_switch_tree *dst = dev->dsa_ptr; |
83 | struct dsa_switch *ds; |
84 | u8 *dsa_header; |
85 | int source_device; |
86 | int source_port; |
87 | |
88 | if (unlikely(dst == NULL)) |
89 | goto out_drop; |
90 | |
91 | skb = skb_unshare(skb, GFP_ATOMIC); |
92 | if (skb == NULL) |
93 | goto out; |
94 | |
95 | if (unlikely(!pskb_may_pull(skb, DSA_HLEN))) |
96 | goto out_drop; |
97 | |
98 | /* |
99 | * The ethertype field is part of the DSA header. |
100 | */ |
101 | dsa_header = skb->data - 2; |
102 | |
103 | /* |
104 | * Check that frame type is either TO_CPU or FORWARD. |
105 | */ |
106 | if ((dsa_header[0] & 0xc0) != 0x00 && (dsa_header[0] & 0xc0) != 0xc0) |
107 | goto out_drop; |
108 | |
109 | /* |
110 | * Determine source device and port. |
111 | */ |
112 | source_device = dsa_header[0] & 0x1f; |
113 | source_port = (dsa_header[1] >> 3) & 0x1f; |
114 | |
115 | /* |
116 | * Check that the source device exists and that the source |
117 | * port is a registered DSA port. |
118 | */ |
119 | if (source_device >= dst->pd->nr_chips) |
120 | goto out_drop; |
121 | ds = dst->ds[source_device]; |
122 | if (source_port >= DSA_MAX_PORTS || ds->ports[source_port] == NULL) |
123 | goto out_drop; |
124 | |
125 | /* |
126 | * Convert the DSA header to an 802.1q header if the 'tagged' |
127 | * bit in the DSA header is set. If the 'tagged' bit is clear, |
128 | * delete the DSA header entirely. |
129 | */ |
130 | if (dsa_header[0] & 0x20) { |
131 | u8 new_header[4]; |
132 | |
133 | /* |
134 | * Insert 802.1q ethertype and copy the VLAN-related |
135 | * fields, but clear the bit that will hold CFI (since |
136 | * DSA uses that bit location for another purpose). |
137 | */ |
138 | new_header[0] = (ETH_P_8021Q >> 8) & 0xff; |
139 | new_header[1] = ETH_P_8021Q & 0xff; |
140 | new_header[2] = dsa_header[2] & ~0x10; |
141 | new_header[3] = dsa_header[3]; |
142 | |
143 | /* |
144 | * Move CFI bit from its place in the DSA header to |
145 | * its 802.1q-designated place. |
146 | */ |
147 | if (dsa_header[1] & 0x01) |
148 | new_header[2] |= 0x10; |
149 | |
150 | /* |
151 | * Update packet checksum if skb is CHECKSUM_COMPLETE. |
152 | */ |
153 | if (skb->ip_summed == CHECKSUM_COMPLETE) { |
154 | __wsum c = skb->csum; |
155 | c = csum_add(c, csum_partial(new_header + 2, 2, 0)); |
156 | c = csum_sub(c, csum_partial(dsa_header + 2, 2, 0)); |
157 | skb->csum = c; |
158 | } |
159 | |
160 | memcpy(dsa_header, new_header, DSA_HLEN); |
161 | } else { |
162 | /* |
163 | * Remove DSA tag and update checksum. |
164 | */ |
165 | skb_pull_rcsum(skb, DSA_HLEN); |
166 | memmove(skb->data - ETH_HLEN, |
167 | skb->data - ETH_HLEN - DSA_HLEN, |
168 | 2 * ETH_ALEN); |
169 | } |
170 | |
171 | skb->dev = ds->ports[source_port]; |
172 | skb_push(skb, ETH_HLEN); |
173 | skb->pkt_type = PACKET_HOST; |
174 | skb->protocol = eth_type_trans(skb, skb->dev); |
175 | |
176 | skb->dev->stats.rx_packets++; |
177 | skb->dev->stats.rx_bytes += skb->len; |
178 | |
179 | netif_receive_skb(skb); |
180 | |
181 | return 0; |
182 | |
183 | out_drop: |
184 | kfree_skb(skb); |
185 | out: |
186 | return 0; |
187 | } |
188 | |
189 | static struct packet_type dsa_packet_type __read_mostly = { |
190 | .type = cpu_to_be16(ETH_P_DSA), |
191 | .func = dsa_rcv, |
192 | }; |
193 | |
194 | static int __init dsa_init_module(void) |
195 | { |
196 | dev_add_pack(&dsa_packet_type); |
197 | return 0; |
198 | } |
199 | module_init(dsa_init_module); |
200 | |
201 | static void __exit dsa_cleanup_module(void) |
202 | { |
203 | dev_remove_pack(&dsa_packet_type); |
204 | } |
205 | module_exit(dsa_cleanup_module); |
206 |
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