Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Linux ARCnet driver - RFC1051 ("simple" standard) packet encapsulation |
Joe Perches | cb33464 | 2015-05-05 10:05:47 -0700 | [diff] [blame] | 3 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | #include <linux/module.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 27 | #include <linux/gfp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include <linux/init.h> |
| 29 | #include <linux/if_arp.h> |
| 30 | #include <net/arp.h> |
| 31 | #include <linux/netdevice.h> |
| 32 | #include <linux/skbuff.h> |
| 33 | #include <linux/arcdevice.h> |
| 34 | |
| 35 | #define VERSION "arcnet: RFC1051 \"simple standard\" (`s') encapsulation support loaded.\n" |
| 36 | |
Al Viro | 701181a | 2007-08-22 22:59:11 -0400 | [diff] [blame] | 37 | static __be16 type_trans(struct sk_buff *skb, struct net_device *dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | static void rx(struct net_device *dev, int bufnum, |
| 39 | struct archdr *pkthdr, int length); |
| 40 | static int build_header(struct sk_buff *skb, struct net_device *dev, |
| 41 | unsigned short type, uint8_t daddr); |
| 42 | static int prepare_tx(struct net_device *dev, struct archdr *pkt, int length, |
| 43 | int bufnum); |
| 44 | |
Joe Perches | 7f5e760 | 2015-05-05 10:05:49 -0700 | [diff] [blame] | 45 | static struct ArcProto rfc1051_proto = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | .suffix = 's', |
| 47 | .mtu = XMTU - RFC1051_HDR_SIZE, |
| 48 | .is_ip = 1, |
| 49 | .rx = rx, |
| 50 | .build_header = build_header, |
| 51 | .prepare_tx = prepare_tx, |
| 52 | .continue_tx = NULL, |
| 53 | .ack_tx = NULL |
| 54 | }; |
| 55 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | static int __init arcnet_rfc1051_init(void) |
| 57 | { |
| 58 | printk(VERSION); |
| 59 | |
| 60 | arc_proto_map[ARC_P_IP_RFC1051] |
| 61 | = arc_proto_map[ARC_P_ARP_RFC1051] |
| 62 | = &rfc1051_proto; |
| 63 | |
| 64 | /* if someone else already owns the broadcast, we won't take it */ |
| 65 | if (arc_bcast_proto == arc_proto_default) |
| 66 | arc_bcast_proto = &rfc1051_proto; |
| 67 | |
| 68 | return 0; |
| 69 | } |
| 70 | |
| 71 | static void __exit arcnet_rfc1051_exit(void) |
| 72 | { |
| 73 | arcnet_unregister_proto(&rfc1051_proto); |
| 74 | } |
| 75 | |
| 76 | module_init(arcnet_rfc1051_init); |
| 77 | module_exit(arcnet_rfc1051_exit); |
| 78 | |
| 79 | MODULE_LICENSE("GPL"); |
| 80 | |
Joe Perches | f2f0a16 | 2015-05-05 10:05:52 -0700 | [diff] [blame] | 81 | /* Determine a packet's protocol ID. |
Joe Perches | cb33464 | 2015-05-05 10:05:47 -0700 | [diff] [blame] | 82 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | * With ARCnet we have to convert everything to Ethernet-style stuff. |
| 84 | */ |
Al Viro | 701181a | 2007-08-22 22:59:11 -0400 | [diff] [blame] | 85 | static __be16 type_trans(struct sk_buff *skb, struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | { |
Joe Perches | cb33464 | 2015-05-05 10:05:47 -0700 | [diff] [blame] | 87 | struct archdr *pkt = (struct archdr *)skb->data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | struct arc_rfc1051 *soft = &pkt->soft.rfc1051; |
| 89 | int hdr_size = ARC_HDR_SIZE + RFC1051_HDR_SIZE; |
| 90 | |
| 91 | /* Pull off the arcnet header. */ |
Arnaldo Carvalho de Melo | 459a98e | 2007-03-19 15:30:44 -0700 | [diff] [blame] | 92 | skb_reset_mac_header(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | skb_pull(skb, hdr_size); |
| 94 | |
Joe Perches | 7f5e760 | 2015-05-05 10:05:49 -0700 | [diff] [blame] | 95 | if (pkt->hard.dest == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | skb->pkt_type = PACKET_BROADCAST; |
Joe Perches | 7f5e760 | 2015-05-05 10:05:49 -0700 | [diff] [blame] | 97 | } else if (dev->flags & IFF_PROMISC) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | /* if we're not sending to ourselves :) */ |
| 99 | if (pkt->hard.dest != dev->dev_addr[0]) |
| 100 | skb->pkt_type = PACKET_OTHERHOST; |
| 101 | } |
| 102 | /* now return the protocol number */ |
| 103 | switch (soft->proto) { |
| 104 | case ARC_P_IP_RFC1051: |
| 105 | return htons(ETH_P_IP); |
| 106 | case ARC_P_ARP_RFC1051: |
| 107 | return htons(ETH_P_ARP); |
| 108 | |
| 109 | default: |
Stephen Hemminger | 5803c51 | 2009-01-09 13:01:08 +0000 | [diff] [blame] | 110 | dev->stats.rx_errors++; |
| 111 | dev->stats.rx_crc_errors++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | return 0; |
| 113 | } |
| 114 | |
| 115 | return htons(ETH_P_IP); |
| 116 | } |
| 117 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | /* packet receiver */ |
| 119 | static void rx(struct net_device *dev, int bufnum, |
| 120 | struct archdr *pkthdr, int length) |
| 121 | { |
Wang Chen | 454d7c9 | 2008-11-12 23:37:49 -0800 | [diff] [blame] | 122 | struct arcnet_local *lp = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | struct sk_buff *skb; |
| 124 | struct archdr *pkt = pkthdr; |
| 125 | int ofs; |
| 126 | |
Joe Perches | a34c093 | 2015-05-05 10:05:55 -0700 | [diff] [blame^] | 127 | arc_printk(D_DURING, dev, "it's a raw packet (length=%d)\n", length); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | |
| 129 | if (length >= MinTU) |
| 130 | ofs = 512 - length; |
| 131 | else |
| 132 | ofs = 256 - length; |
| 133 | |
| 134 | skb = alloc_skb(length + ARC_HDR_SIZE, GFP_ATOMIC); |
| 135 | if (skb == NULL) { |
Joe Perches | a34c093 | 2015-05-05 10:05:55 -0700 | [diff] [blame^] | 136 | arc_printk(D_NORMAL, dev, "Memory squeeze, dropping packet\n"); |
Stephen Hemminger | 5803c51 | 2009-01-09 13:01:08 +0000 | [diff] [blame] | 137 | dev->stats.rx_dropped++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | return; |
| 139 | } |
| 140 | skb_put(skb, length + ARC_HDR_SIZE); |
| 141 | skb->dev = dev; |
| 142 | |
Joe Perches | cb33464 | 2015-05-05 10:05:47 -0700 | [diff] [blame] | 143 | pkt = (struct archdr *)skb->data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | |
| 145 | /* up to sizeof(pkt->soft) has already been copied from the card */ |
| 146 | memcpy(pkt, pkthdr, sizeof(struct archdr)); |
| 147 | if (length > sizeof(pkt->soft)) |
| 148 | lp->hw.copy_from_card(dev, bufnum, ofs + sizeof(pkt->soft), |
| 149 | pkt->soft.raw + sizeof(pkt->soft), |
| 150 | length - sizeof(pkt->soft)); |
| 151 | |
Joe Perches | 72aeea4 | 2015-05-05 10:05:54 -0700 | [diff] [blame] | 152 | if (BUGLVL(D_SKB)) |
| 153 | arcnet_dump_skb(dev, skb, "rx"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | |
| 155 | skb->protocol = type_trans(skb, dev); |
| 156 | netif_rx(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | } |
| 158 | |
Joe Perches | f2f0a16 | 2015-05-05 10:05:52 -0700 | [diff] [blame] | 159 | /* Create the ARCnet hard/soft headers for RFC1051 */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | static int build_header(struct sk_buff *skb, struct net_device *dev, |
| 161 | unsigned short type, uint8_t daddr) |
| 162 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | int hdr_size = ARC_HDR_SIZE + RFC1051_HDR_SIZE; |
Joe Perches | cb33464 | 2015-05-05 10:05:47 -0700 | [diff] [blame] | 164 | struct archdr *pkt = (struct archdr *)skb_push(skb, hdr_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | struct arc_rfc1051 *soft = &pkt->soft.rfc1051; |
| 166 | |
| 167 | /* set the protocol ID according to RFC1051 */ |
| 168 | switch (type) { |
| 169 | case ETH_P_IP: |
| 170 | soft->proto = ARC_P_IP_RFC1051; |
| 171 | break; |
| 172 | case ETH_P_ARP: |
| 173 | soft->proto = ARC_P_ARP_RFC1051; |
| 174 | break; |
| 175 | default: |
Joe Perches | a34c093 | 2015-05-05 10:05:55 -0700 | [diff] [blame^] | 176 | arc_printk(D_NORMAL, dev, "RFC1051: I don't understand protocol %d (%Xh)\n", |
| 177 | type, type); |
Stephen Hemminger | 5803c51 | 2009-01-09 13:01:08 +0000 | [diff] [blame] | 178 | dev->stats.tx_errors++; |
| 179 | dev->stats.tx_aborted_errors++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | return 0; |
| 181 | } |
| 182 | |
Joe Perches | f2f0a16 | 2015-05-05 10:05:52 -0700 | [diff] [blame] | 183 | /* Set the source hardware address. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | * |
| 185 | * This is pretty pointless for most purposes, but it can help in |
Joe Perches | f2f0a16 | 2015-05-05 10:05:52 -0700 | [diff] [blame] | 186 | * debugging. ARCnet does not allow us to change the source address |
| 187 | * in the actual packet sent. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | */ |
| 189 | pkt->hard.source = *dev->dev_addr; |
| 190 | |
| 191 | /* see linux/net/ethernet/eth.c to see where I got the following */ |
| 192 | |
| 193 | if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) { |
Joe Perches | f2f0a16 | 2015-05-05 10:05:52 -0700 | [diff] [blame] | 194 | /* FIXME: fill in the last byte of the dest ipaddr here to |
| 195 | * better comply with RFC1051 in "noarp" mode. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | */ |
| 197 | pkt->hard.dest = 0; |
| 198 | return hdr_size; |
| 199 | } |
| 200 | /* otherwise, just fill it in and go! */ |
| 201 | pkt->hard.dest = daddr; |
| 202 | |
| 203 | return hdr_size; /* success */ |
| 204 | } |
| 205 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | static int prepare_tx(struct net_device *dev, struct archdr *pkt, int length, |
| 207 | int bufnum) |
| 208 | { |
Wang Chen | 454d7c9 | 2008-11-12 23:37:49 -0800 | [diff] [blame] | 209 | struct arcnet_local *lp = netdev_priv(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | struct arc_hardware *hard = &pkt->hard; |
| 211 | int ofs; |
| 212 | |
Joe Perches | a34c093 | 2015-05-05 10:05:55 -0700 | [diff] [blame^] | 213 | arc_printk(D_DURING, dev, "prepare_tx: txbufs=%d/%d/%d\n", |
| 214 | lp->next_tx, lp->cur_tx, bufnum); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | |
| 216 | length -= ARC_HDR_SIZE; /* hard header is not included in packet length */ |
| 217 | |
| 218 | if (length > XMTU) { |
| 219 | /* should never happen! other people already check for this. */ |
Joe Perches | a34c093 | 2015-05-05 10:05:55 -0700 | [diff] [blame^] | 220 | arc_printk(D_NORMAL, dev, "Bug! prepare_tx with size %d (> %d)\n", |
| 221 | length, XMTU); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | length = XMTU; |
| 223 | } |
| 224 | if (length > MinTU) { |
| 225 | hard->offset[0] = 0; |
| 226 | hard->offset[1] = ofs = 512 - length; |
| 227 | } else if (length > MTU) { |
| 228 | hard->offset[0] = 0; |
| 229 | hard->offset[1] = ofs = 512 - length - 3; |
Joe Perches | 7f5e760 | 2015-05-05 10:05:49 -0700 | [diff] [blame] | 230 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | hard->offset[0] = ofs = 256 - length; |
Joe Perches | 7f5e760 | 2015-05-05 10:05:49 -0700 | [diff] [blame] | 232 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | |
| 234 | lp->hw.copy_to_card(dev, bufnum, 0, hard, ARC_HDR_SIZE); |
| 235 | lp->hw.copy_to_card(dev, bufnum, ofs, &pkt->soft, length); |
| 236 | |
| 237 | lp->lastload_dest = hard->dest; |
| 238 | |
| 239 | return 1; /* done */ |
| 240 | } |