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1 | /* |
2 | * net/dsa/tag_trailer.c - Trailer tag format handling |
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 | netdev_tx_t trailer_xmit(struct sk_buff *skb, struct net_device *dev) |
18 | { |
19 | struct dsa_slave_priv *p = netdev_priv(dev); |
20 | struct sk_buff *nskb; |
21 | int padlen; |
22 | u8 *trailer; |
23 | |
24 | dev->stats.tx_packets++; |
25 | dev->stats.tx_bytes += skb->len; |
26 | |
27 | /* |
28 | * We have to make sure that the trailer ends up as the very |
29 | * last 4 bytes of the packet. This means that we have to pad |
30 | * the packet to the minimum ethernet frame size, if necessary, |
31 | * before adding the trailer. |
32 | */ |
33 | padlen = 0; |
34 | if (skb->len < 60) |
35 | padlen = 60 - skb->len; |
36 | |
37 | nskb = alloc_skb(NET_IP_ALIGN + skb->len + padlen + 4, GFP_ATOMIC); |
38 | if (nskb == NULL) { |
39 | kfree_skb(skb); |
40 | return NETDEV_TX_OK; |
41 | } |
42 | skb_reserve(nskb, NET_IP_ALIGN); |
43 | |
44 | skb_reset_mac_header(nskb); |
45 | skb_set_network_header(nskb, skb_network_header(skb) - skb->head); |
46 | skb_set_transport_header(nskb, skb_transport_header(skb) - skb->head); |
47 | skb_copy_and_csum_dev(skb, skb_put(nskb, skb->len)); |
48 | kfree_skb(skb); |
49 | |
50 | if (padlen) { |
51 | u8 *pad = skb_put(nskb, padlen); |
52 | memset(pad, 0, padlen); |
53 | } |
54 | |
55 | trailer = skb_put(nskb, 4); |
56 | trailer[0] = 0x80; |
57 | trailer[1] = 1 << p->port; |
58 | trailer[2] = 0x10; |
59 | trailer[3] = 0x00; |
60 | |
61 | nskb->protocol = htons(ETH_P_TRAILER); |
62 | |
63 | nskb->dev = p->parent->dst->master_netdev; |
64 | dev_queue_xmit(nskb); |
65 | |
66 | return NETDEV_TX_OK; |
67 | } |
68 | |
69 | static int trailer_rcv(struct sk_buff *skb, struct net_device *dev, |
70 | struct packet_type *pt, struct net_device *orig_dev) |
71 | { |
72 | struct dsa_switch_tree *dst = dev->dsa_ptr; |
73 | struct dsa_switch *ds; |
74 | u8 *trailer; |
75 | int source_port; |
76 | |
77 | if (unlikely(dst == NULL)) |
78 | goto out_drop; |
79 | ds = dst->ds[0]; |
80 | |
81 | skb = skb_unshare(skb, GFP_ATOMIC); |
82 | if (skb == NULL) |
83 | goto out; |
84 | |
85 | if (skb_linearize(skb)) |
86 | goto out_drop; |
87 | |
88 | trailer = skb_tail_pointer(skb) - 4; |
89 | if (trailer[0] != 0x80 || (trailer[1] & 0xf8) != 0x00 || |
90 | (trailer[3] & 0xef) != 0x00 || trailer[3] != 0x00) |
91 | goto out_drop; |
92 | |
93 | source_port = trailer[1] & 7; |
94 | if (source_port >= DSA_MAX_PORTS || ds->ports[source_port] == NULL) |
95 | goto out_drop; |
96 | |
97 | pskb_trim_rcsum(skb, skb->len - 4); |
98 | |
99 | skb->dev = ds->ports[source_port]; |
100 | skb_push(skb, ETH_HLEN); |
101 | skb->pkt_type = PACKET_HOST; |
102 | skb->protocol = eth_type_trans(skb, skb->dev); |
103 | |
104 | skb->dev->stats.rx_packets++; |
105 | skb->dev->stats.rx_bytes += skb->len; |
106 | |
107 | netif_receive_skb(skb); |
108 | |
109 | return 0; |
110 | |
111 | out_drop: |
112 | kfree_skb(skb); |
113 | out: |
114 | return 0; |
115 | } |
116 | |
117 | struct packet_type trailer_packet_type __read_mostly = { |
118 | .type = cpu_to_be16(ETH_P_TRAILER), |
119 | .func = trailer_rcv, |
120 | }; |
121 |
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