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1da177e4 LT |
1 | /* |
2 | * Linux ARCnet driver - "raw mode" packet encapsulation (no soft headers) | |
cb334648 | 3 | * |
1da177e4 LT |
4 | * Written 1994-1999 by Avery Pennarun. |
5 | * Derived from skeleton.c by Donald Becker. | |
6 | * | |
7 | * Special thanks to Contemporary Controls, Inc. (www.ccontrols.com) | |
8 | * for sponsoring the further development of this driver. | |
9 | * | |
10 | * ********************** | |
11 | * | |
12 | * The original copyright of skeleton.c was as follows: | |
13 | * | |
14 | * skeleton.c Written 1993 by Donald Becker. | |
15 | * Copyright 1993 United States Government as represented by the | |
16 | * Director, National Security Agency. This software may only be used | |
17 | * and distributed according to the terms of the GNU General Public License as | |
18 | * modified by SRC, incorporated herein by reference. | |
19 | * | |
20 | * ********************** | |
21 | * | |
22 | * For more details, see drivers/net/arcnet.c | |
23 | * | |
24 | * ********************** | |
25 | */ | |
26 | ||
05a24b23 JP |
27 | #define pr_fmt(fmt) "arcnet:" KBUILD_MODNAME ": " fmt |
28 | ||
1da177e4 | 29 | #include <linux/module.h> |
5a0e3ad6 | 30 | #include <linux/gfp.h> |
1da177e4 LT |
31 | #include <linux/init.h> |
32 | #include <linux/if_arp.h> | |
33 | #include <net/arp.h> | |
34 | #include <linux/netdevice.h> | |
35 | #include <linux/skbuff.h> | |
26c6d281 | 36 | #include "arcdevice.h" |
1da177e4 | 37 | |
1da177e4 LT |
38 | /* packet receiver */ |
39 | static void rx(struct net_device *dev, int bufnum, | |
40 | struct archdr *pkthdr, int length) | |
41 | { | |
454d7c9b | 42 | struct arcnet_local *lp = netdev_priv(dev); |
1da177e4 LT |
43 | struct sk_buff *skb; |
44 | struct archdr *pkt = pkthdr; | |
45 | int ofs; | |
46 | ||
a34c0932 | 47 | arc_printk(D_DURING, dev, "it's a raw packet (length=%d)\n", length); |
1da177e4 | 48 | |
52edc17f | 49 | if (length > MTU) |
1da177e4 LT |
50 | ofs = 512 - length; |
51 | else | |
52 | ofs = 256 - length; | |
53 | ||
54 | skb = alloc_skb(length + ARC_HDR_SIZE, GFP_ATOMIC); | |
d8101e7b | 55 | if (!skb) { |
5803c512 | 56 | dev->stats.rx_dropped++; |
1da177e4 LT |
57 | return; |
58 | } | |
59 | skb_put(skb, length + ARC_HDR_SIZE); | |
60 | skb->dev = dev; | |
61 | ||
cb334648 | 62 | pkt = (struct archdr *)skb->data; |
1da177e4 | 63 | |
459a98ed | 64 | skb_reset_mac_header(skb); |
1da177e4 LT |
65 | skb_pull(skb, ARC_HDR_SIZE); |
66 | ||
67 | /* up to sizeof(pkt->soft) has already been copied from the card */ | |
68 | memcpy(pkt, pkthdr, sizeof(struct archdr)); | |
69 | if (length > sizeof(pkt->soft)) | |
70 | lp->hw.copy_from_card(dev, bufnum, ofs + sizeof(pkt->soft), | |
71 | pkt->soft.raw + sizeof(pkt->soft), | |
72 | length - sizeof(pkt->soft)); | |
73 | ||
72aeea48 JP |
74 | if (BUGLVL(D_SKB)) |
75 | arcnet_dump_skb(dev, skb, "rx"); | |
1da177e4 | 76 | |
09640e63 | 77 | skb->protocol = cpu_to_be16(ETH_P_ARCNET); |
1da177e4 | 78 | netif_rx(skb); |
1da177e4 LT |
79 | } |
80 | ||
f2f0a16b | 81 | /* Create the ARCnet hard/soft headers for raw mode. |
1da177e4 LT |
82 | * There aren't any soft headers in raw mode - not even the protocol id. |
83 | */ | |
84 | static int build_header(struct sk_buff *skb, struct net_device *dev, | |
85 | unsigned short type, uint8_t daddr) | |
86 | { | |
87 | int hdr_size = ARC_HDR_SIZE; | |
cb334648 | 88 | struct archdr *pkt = (struct archdr *)skb_push(skb, hdr_size); |
1da177e4 | 89 | |
f2f0a16b | 90 | /* Set the source hardware address. |
1da177e4 LT |
91 | * |
92 | * This is pretty pointless for most purposes, but it can help in | |
f2f0a16b JP |
93 | * debugging. ARCnet does not allow us to change the source address |
94 | * in the actual packet sent. | |
1da177e4 LT |
95 | */ |
96 | pkt->hard.source = *dev->dev_addr; | |
97 | ||
98 | /* see linux/net/ethernet/eth.c to see where I got the following */ | |
99 | ||
100 | if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) { | |
f2f0a16b JP |
101 | /* FIXME: fill in the last byte of the dest ipaddr here |
102 | * to better comply with RFC1051 in "noarp" mode. | |
1da177e4 LT |
103 | */ |
104 | pkt->hard.dest = 0; | |
105 | return hdr_size; | |
106 | } | |
107 | /* otherwise, just fill it in and go! */ | |
108 | pkt->hard.dest = daddr; | |
109 | ||
110 | return hdr_size; /* success */ | |
111 | } | |
112 | ||
1da177e4 LT |
113 | static int prepare_tx(struct net_device *dev, struct archdr *pkt, int length, |
114 | int bufnum) | |
115 | { | |
454d7c9b | 116 | struct arcnet_local *lp = netdev_priv(dev); |
1da177e4 LT |
117 | struct arc_hardware *hard = &pkt->hard; |
118 | int ofs; | |
119 | ||
a34c0932 JP |
120 | arc_printk(D_DURING, dev, "prepare_tx: txbufs=%d/%d/%d\n", |
121 | lp->next_tx, lp->cur_tx, bufnum); | |
1da177e4 | 122 | |
d6d7d3ed JP |
123 | /* hard header is not included in packet length */ |
124 | length -= ARC_HDR_SIZE; | |
1da177e4 LT |
125 | |
126 | if (length > XMTU) { | |
127 | /* should never happen! other people already check for this. */ | |
a34c0932 JP |
128 | arc_printk(D_NORMAL, dev, "Bug! prepare_tx with size %d (> %d)\n", |
129 | length, XMTU); | |
1da177e4 LT |
130 | length = XMTU; |
131 | } | |
52edc17f | 132 | if (length >= MinTU) { |
1da177e4 LT |
133 | hard->offset[0] = 0; |
134 | hard->offset[1] = ofs = 512 - length; | |
135 | } else if (length > MTU) { | |
136 | hard->offset[0] = 0; | |
137 | hard->offset[1] = ofs = 512 - length - 3; | |
7f5e760c | 138 | } else { |
1da177e4 | 139 | hard->offset[0] = ofs = 256 - length; |
7f5e760c | 140 | } |
1da177e4 | 141 | |
a34c0932 JP |
142 | arc_printk(D_DURING, dev, "prepare_tx: length=%d ofs=%d\n", |
143 | length, ofs); | |
1da177e4 LT |
144 | |
145 | lp->hw.copy_to_card(dev, bufnum, 0, hard, ARC_HDR_SIZE); | |
146 | lp->hw.copy_to_card(dev, bufnum, ofs, &pkt->soft, length); | |
147 | ||
148 | lp->lastload_dest = hard->dest; | |
149 | ||
150 | return 1; /* done */ | |
151 | } | |
abc23ec9 MG |
152 | |
153 | static struct ArcProto rawmode_proto = { | |
154 | .suffix = 'r', | |
155 | .mtu = XMTU, | |
156 | .rx = rx, | |
157 | .build_header = build_header, | |
158 | .prepare_tx = prepare_tx, | |
159 | .continue_tx = NULL, | |
160 | .ack_tx = NULL | |
161 | }; | |
162 | ||
163 | static int __init arcnet_raw_init(void) | |
164 | { | |
165 | int count; | |
166 | ||
167 | pr_info("raw mode (`r') encapsulation support loaded\n"); | |
168 | ||
169 | for (count = 0; count < 256; count++) | |
170 | if (arc_proto_map[count] == arc_proto_default) | |
171 | arc_proto_map[count] = &rawmode_proto; | |
172 | ||
173 | /* for raw mode, we only set the bcast proto if there's no better one */ | |
174 | if (arc_bcast_proto == arc_proto_default) | |
175 | arc_bcast_proto = &rawmode_proto; | |
176 | ||
177 | arc_proto_default = &rawmode_proto; | |
178 | return 0; | |
179 | } | |
180 | ||
181 | static void __exit arcnet_raw_exit(void) | |
182 | { | |
183 | arcnet_unregister_proto(&rawmode_proto); | |
184 | } | |
185 | ||
186 | module_init(arcnet_raw_init); | |
187 | module_exit(arcnet_raw_exit); | |
188 | ||
189 | MODULE_LICENSE("GPL"); |