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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Linux ARCnet driver - RFC1201 (standard) packet encapsulation | |
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 | */ | |
05a24b23 JP |
26 | |
27 | #define pr_fmt(fmt) "arcnet:" KBUILD_MODNAME ": " fmt | |
28 | ||
5a0e3ad6 | 29 | #include <linux/gfp.h> |
1da177e4 LT |
30 | #include <linux/module.h> |
31 | #include <linux/init.h> | |
32 | #include <linux/if_arp.h> | |
33 | #include <linux/netdevice.h> | |
34 | #include <linux/skbuff.h> | |
26c6d281 JP |
35 | |
36 | #include "arcdevice.h" | |
1da177e4 LT |
37 | |
38 | MODULE_LICENSE("GPL"); | |
1da177e4 | 39 | |
701181ac | 40 | static __be16 type_trans(struct sk_buff *skb, struct net_device *dev); |
1da177e4 LT |
41 | static void rx(struct net_device *dev, int bufnum, |
42 | struct archdr *pkthdr, int length); | |
43 | static int build_header(struct sk_buff *skb, struct net_device *dev, | |
44 | unsigned short type, uint8_t daddr); | |
45 | static int prepare_tx(struct net_device *dev, struct archdr *pkt, int length, | |
46 | int bufnum); | |
47 | static int continue_tx(struct net_device *dev, int bufnum); | |
48 | ||
7f5e760c | 49 | static struct ArcProto rfc1201_proto = { |
1da177e4 LT |
50 | .suffix = 'a', |
51 | .mtu = 1500, /* could be more, but some receivers can't handle it... */ | |
52 | .is_ip = 1, /* This is for sending IP and ARP packages */ | |
53 | .rx = rx, | |
54 | .build_header = build_header, | |
55 | .prepare_tx = prepare_tx, | |
56 | .continue_tx = continue_tx, | |
57 | .ack_tx = NULL | |
58 | }; | |
59 | ||
1da177e4 LT |
60 | static int __init arcnet_rfc1201_init(void) |
61 | { | |
05a24b23 | 62 | pr_info("%s\n", "RFC1201 \"standard\" (`a') encapsulation support loaded"); |
1da177e4 LT |
63 | |
64 | arc_proto_map[ARC_P_IP] | |
65 | = arc_proto_map[ARC_P_IPV6] | |
66 | = arc_proto_map[ARC_P_ARP] | |
67 | = arc_proto_map[ARC_P_RARP] | |
68 | = arc_proto_map[ARC_P_IPX] | |
69 | = arc_proto_map[ARC_P_NOVELL_EC] | |
70 | = &rfc1201_proto; | |
71 | ||
72 | /* if someone else already owns the broadcast, we won't take it */ | |
73 | if (arc_bcast_proto == arc_proto_default) | |
74 | arc_bcast_proto = &rfc1201_proto; | |
75 | ||
76 | return 0; | |
77 | } | |
78 | ||
79 | static void __exit arcnet_rfc1201_exit(void) | |
80 | { | |
81 | arcnet_unregister_proto(&rfc1201_proto); | |
82 | } | |
83 | ||
84 | module_init(arcnet_rfc1201_init); | |
85 | module_exit(arcnet_rfc1201_exit); | |
86 | ||
f2f0a16b | 87 | /* Determine a packet's protocol ID. |
cb334648 | 88 | * |
1da177e4 LT |
89 | * With ARCnet we have to convert everything to Ethernet-style stuff. |
90 | */ | |
701181ac | 91 | static __be16 type_trans(struct sk_buff *skb, struct net_device *dev) |
1da177e4 | 92 | { |
cb334648 | 93 | struct archdr *pkt = (struct archdr *)skb->data; |
1da177e4 | 94 | struct arc_rfc1201 *soft = &pkt->soft.rfc1201; |
1da177e4 LT |
95 | int hdr_size = ARC_HDR_SIZE + RFC1201_HDR_SIZE; |
96 | ||
97 | /* Pull off the arcnet header. */ | |
459a98ed | 98 | skb_reset_mac_header(skb); |
1da177e4 LT |
99 | skb_pull(skb, hdr_size); |
100 | ||
7f5e760c | 101 | if (pkt->hard.dest == 0) { |
1da177e4 | 102 | skb->pkt_type = PACKET_BROADCAST; |
7f5e760c | 103 | } else if (dev->flags & IFF_PROMISC) { |
1da177e4 LT |
104 | /* if we're not sending to ourselves :) */ |
105 | if (pkt->hard.dest != dev->dev_addr[0]) | |
106 | skb->pkt_type = PACKET_OTHERHOST; | |
107 | } | |
108 | /* now return the protocol number */ | |
109 | switch (soft->proto) { | |
110 | case ARC_P_IP: | |
111 | return htons(ETH_P_IP); | |
112 | case ARC_P_IPV6: | |
113 | return htons(ETH_P_IPV6); | |
114 | case ARC_P_ARP: | |
115 | return htons(ETH_P_ARP); | |
116 | case ARC_P_RARP: | |
117 | return htons(ETH_P_RARP); | |
118 | ||
119 | case ARC_P_IPX: | |
120 | case ARC_P_NOVELL_EC: | |
121 | return htons(ETH_P_802_3); | |
122 | default: | |
5803c512 SH |
123 | dev->stats.rx_errors++; |
124 | dev->stats.rx_crc_errors++; | |
1da177e4 LT |
125 | return 0; |
126 | } | |
127 | ||
128 | return htons(ETH_P_IP); | |
129 | } | |
130 | ||
1da177e4 LT |
131 | /* packet receiver */ |
132 | static void rx(struct net_device *dev, int bufnum, | |
133 | struct archdr *pkthdr, int length) | |
134 | { | |
454d7c9b | 135 | struct arcnet_local *lp = netdev_priv(dev); |
1da177e4 LT |
136 | struct sk_buff *skb; |
137 | struct archdr *pkt = pkthdr; | |
138 | struct arc_rfc1201 *soft = &pkthdr->soft.rfc1201; | |
139 | int saddr = pkt->hard.source, ofs; | |
140 | struct Incoming *in = &lp->rfc1201.incoming[saddr]; | |
141 | ||
a34c0932 JP |
142 | arc_printk(D_DURING, dev, "it's an RFC1201 packet (length=%d)\n", |
143 | length); | |
1da177e4 LT |
144 | |
145 | if (length >= MinTU) | |
146 | ofs = 512 - length; | |
147 | else | |
148 | ofs = 256 - length; | |
149 | ||
150 | if (soft->split_flag == 0xFF) { /* Exception Packet */ | |
7f5e760c | 151 | if (length >= 4 + RFC1201_HDR_SIZE) { |
a34c0932 | 152 | arc_printk(D_DURING, dev, "compensating for exception packet\n"); |
7f5e760c | 153 | } else { |
a34c0932 JP |
154 | arc_printk(D_EXTRA, dev, "short RFC1201 exception packet from %02Xh", |
155 | saddr); | |
1da177e4 LT |
156 | return; |
157 | } | |
158 | ||
159 | /* skip over 4-byte junkola */ | |
160 | length -= 4; | |
161 | ofs += 4; | |
162 | lp->hw.copy_from_card(dev, bufnum, 512 - length, | |
163 | soft, sizeof(pkt->soft)); | |
164 | } | |
165 | if (!soft->split_flag) { /* not split */ | |
a34c0932 JP |
166 | arc_printk(D_RX, dev, "incoming is not split (splitflag=%d)\n", |
167 | soft->split_flag); | |
1da177e4 LT |
168 | |
169 | if (in->skb) { /* already assembling one! */ | |
a34c0932 JP |
170 | arc_printk(D_EXTRA, dev, "aborting assembly (seq=%d) for unsplit packet (splitflag=%d, seq=%d)\n", |
171 | in->sequence, soft->split_flag, | |
172 | soft->sequence); | |
1da177e4 LT |
173 | lp->rfc1201.aborted_seq = soft->sequence; |
174 | dev_kfree_skb_irq(in->skb); | |
5803c512 SH |
175 | dev->stats.rx_errors++; |
176 | dev->stats.rx_missed_errors++; | |
1da177e4 LT |
177 | in->skb = NULL; |
178 | } | |
179 | in->sequence = soft->sequence; | |
180 | ||
181 | skb = alloc_skb(length + ARC_HDR_SIZE, GFP_ATOMIC); | |
d8101e7b | 182 | if (!skb) { |
5803c512 | 183 | dev->stats.rx_dropped++; |
1da177e4 LT |
184 | return; |
185 | } | |
186 | skb_put(skb, length + ARC_HDR_SIZE); | |
187 | skb->dev = dev; | |
188 | ||
cb334648 | 189 | pkt = (struct archdr *)skb->data; |
1da177e4 LT |
190 | soft = &pkt->soft.rfc1201; |
191 | ||
d6d7d3ed JP |
192 | /* up to sizeof(pkt->soft) has already |
193 | * been copied from the card | |
194 | */ | |
1da177e4 LT |
195 | memcpy(pkt, pkthdr, sizeof(struct archdr)); |
196 | if (length > sizeof(pkt->soft)) | |
d6d7d3ed JP |
197 | lp->hw.copy_from_card(dev, bufnum, |
198 | ofs + sizeof(pkt->soft), | |
199 | pkt->soft.raw + sizeof(pkt->soft), | |
1da177e4 LT |
200 | length - sizeof(pkt->soft)); |
201 | ||
f2f0a16b JP |
202 | /* ARP packets have problems when sent from some DOS systems: |
203 | * the source address is always 0! | |
204 | * So we take the hardware source addr (which is impossible | |
205 | * to fumble) and insert it ourselves. | |
1da177e4 LT |
206 | */ |
207 | if (soft->proto == ARC_P_ARP) { | |
cb334648 | 208 | struct arphdr *arp = (struct arphdr *)soft->payload; |
1da177e4 LT |
209 | |
210 | /* make sure addresses are the right length */ | |
211 | if (arp->ar_hln == 1 && arp->ar_pln == 4) { | |
cb334648 | 212 | uint8_t *cptr = (uint8_t *)arp + sizeof(struct arphdr); |
1da177e4 LT |
213 | |
214 | if (!*cptr) { /* is saddr = 00? */ | |
a34c0932 JP |
215 | arc_printk(D_EXTRA, dev, |
216 | "ARP source address was 00h, set to %02Xh\n", | |
217 | saddr); | |
5803c512 | 218 | dev->stats.rx_crc_errors++; |
1da177e4 LT |
219 | *cptr = saddr; |
220 | } else { | |
a34c0932 JP |
221 | arc_printk(D_DURING, dev, "ARP source address (%Xh) is fine.\n", |
222 | *cptr); | |
1da177e4 LT |
223 | } |
224 | } else { | |
a34c0932 JP |
225 | arc_printk(D_NORMAL, dev, "funny-shaped ARP packet. (%Xh, %Xh)\n", |
226 | arp->ar_hln, arp->ar_pln); | |
5803c512 SH |
227 | dev->stats.rx_errors++; |
228 | dev->stats.rx_crc_errors++; | |
1da177e4 LT |
229 | } |
230 | } | |
72aeea48 JP |
231 | if (BUGLVL(D_SKB)) |
232 | arcnet_dump_skb(dev, skb, "rx"); | |
1da177e4 LT |
233 | |
234 | skb->protocol = type_trans(skb, dev); | |
235 | netif_rx(skb); | |
1da177e4 | 236 | } else { /* split packet */ |
f2f0a16b JP |
237 | /* NOTE: MSDOS ARP packet correction should only need to |
238 | * apply to unsplit packets, since ARP packets are so short. | |
1da177e4 | 239 | * |
f2f0a16b JP |
240 | * My interpretation of the RFC1201 document is that if a |
241 | * packet is received out of order, the entire assembly | |
242 | * process should be aborted. | |
1da177e4 | 243 | * |
f2f0a16b JP |
244 | * The RFC also mentions "it is possible for successfully |
245 | * received packets to be retransmitted." As of 0.40 all | |
246 | * previously received packets are allowed, not just the | |
247 | * most recent one. | |
1da177e4 | 248 | * |
f2f0a16b JP |
249 | * We allow multiple assembly processes, one for each |
250 | * ARCnet card possible on the network. | |
251 | * Seems rather like a waste of memory, but there's no | |
252 | * other way to be reliable. | |
1da177e4 LT |
253 | */ |
254 | ||
a34c0932 JP |
255 | arc_printk(D_RX, dev, "packet is split (splitflag=%d, seq=%d)\n", |
256 | soft->split_flag, in->sequence); | |
1da177e4 LT |
257 | |
258 | if (in->skb && in->sequence != soft->sequence) { | |
a34c0932 JP |
259 | arc_printk(D_EXTRA, dev, "wrong seq number (saddr=%d, expected=%d, seq=%d, splitflag=%d)\n", |
260 | saddr, in->sequence, soft->sequence, | |
261 | soft->split_flag); | |
1da177e4 LT |
262 | dev_kfree_skb_irq(in->skb); |
263 | in->skb = NULL; | |
5803c512 SH |
264 | dev->stats.rx_errors++; |
265 | dev->stats.rx_missed_errors++; | |
1da177e4 LT |
266 | in->lastpacket = in->numpackets = 0; |
267 | } | |
268 | if (soft->split_flag & 1) { /* first packet in split */ | |
a34c0932 JP |
269 | arc_printk(D_RX, dev, "brand new splitpacket (splitflag=%d)\n", |
270 | soft->split_flag); | |
1da177e4 | 271 | if (in->skb) { /* already assembling one! */ |
a34c0932 JP |
272 | arc_printk(D_EXTRA, dev, "aborting previous (seq=%d) assembly (splitflag=%d, seq=%d)\n", |
273 | in->sequence, soft->split_flag, | |
274 | soft->sequence); | |
5803c512 SH |
275 | dev->stats.rx_errors++; |
276 | dev->stats.rx_missed_errors++; | |
1da177e4 LT |
277 | dev_kfree_skb_irq(in->skb); |
278 | } | |
279 | in->sequence = soft->sequence; | |
cb334648 | 280 | in->numpackets = ((unsigned)soft->split_flag >> 1) + 2; |
1da177e4 LT |
281 | in->lastpacket = 1; |
282 | ||
283 | if (in->numpackets > 16) { | |
a34c0932 JP |
284 | arc_printk(D_EXTRA, dev, "incoming packet more than 16 segments; dropping. (splitflag=%d)\n", |
285 | soft->split_flag); | |
1da177e4 | 286 | lp->rfc1201.aborted_seq = soft->sequence; |
5803c512 SH |
287 | dev->stats.rx_errors++; |
288 | dev->stats.rx_length_errors++; | |
1da177e4 LT |
289 | return; |
290 | } | |
291 | in->skb = skb = alloc_skb(508 * in->numpackets + ARC_HDR_SIZE, | |
292 | GFP_ATOMIC); | |
d8101e7b | 293 | if (!skb) { |
a34c0932 | 294 | arc_printk(D_NORMAL, dev, "(split) memory squeeze, dropping packet.\n"); |
1da177e4 | 295 | lp->rfc1201.aborted_seq = soft->sequence; |
5803c512 | 296 | dev->stats.rx_dropped++; |
1da177e4 LT |
297 | return; |
298 | } | |
299 | skb->dev = dev; | |
cb334648 | 300 | pkt = (struct archdr *)skb->data; |
1da177e4 LT |
301 | soft = &pkt->soft.rfc1201; |
302 | ||
303 | memcpy(pkt, pkthdr, ARC_HDR_SIZE + RFC1201_HDR_SIZE); | |
304 | skb_put(skb, ARC_HDR_SIZE + RFC1201_HDR_SIZE); | |
305 | ||
306 | soft->split_flag = 0; /* end result won't be split */ | |
307 | } else { /* not first packet */ | |
cb334648 | 308 | int packetnum = ((unsigned)soft->split_flag >> 1) + 1; |
1da177e4 | 309 | |
f2f0a16b | 310 | /* if we're not assembling, there's no point trying to |
1da177e4 LT |
311 | * continue. |
312 | */ | |
313 | if (!in->skb) { | |
314 | if (lp->rfc1201.aborted_seq != soft->sequence) { | |
a34c0932 JP |
315 | arc_printk(D_EXTRA, dev, "can't continue split without starting first! (splitflag=%d, seq=%d, aborted=%d)\n", |
316 | soft->split_flag, | |
317 | soft->sequence, | |
318 | lp->rfc1201.aborted_seq); | |
5803c512 SH |
319 | dev->stats.rx_errors++; |
320 | dev->stats.rx_missed_errors++; | |
1da177e4 LT |
321 | } |
322 | return; | |
323 | } | |
324 | in->lastpacket++; | |
d6d7d3ed JP |
325 | /* if not the right flag */ |
326 | if (packetnum != in->lastpacket) { | |
1da177e4 LT |
327 | /* harmless duplicate? ignore. */ |
328 | if (packetnum <= in->lastpacket - 1) { | |
a34c0932 JP |
329 | arc_printk(D_EXTRA, dev, "duplicate splitpacket ignored! (splitflag=%d)\n", |
330 | soft->split_flag); | |
5803c512 SH |
331 | dev->stats.rx_errors++; |
332 | dev->stats.rx_frame_errors++; | |
1da177e4 LT |
333 | return; |
334 | } | |
335 | /* "bad" duplicate, kill reassembly */ | |
a34c0932 JP |
336 | arc_printk(D_EXTRA, dev, "out-of-order splitpacket, reassembly (seq=%d) aborted (splitflag=%d, seq=%d)\n", |
337 | in->sequence, soft->split_flag, | |
338 | soft->sequence); | |
1da177e4 LT |
339 | lp->rfc1201.aborted_seq = soft->sequence; |
340 | dev_kfree_skb_irq(in->skb); | |
341 | in->skb = NULL; | |
5803c512 SH |
342 | dev->stats.rx_errors++; |
343 | dev->stats.rx_missed_errors++; | |
1da177e4 LT |
344 | in->lastpacket = in->numpackets = 0; |
345 | return; | |
346 | } | |
cb334648 | 347 | pkt = (struct archdr *)in->skb->data; |
1da177e4 LT |
348 | soft = &pkt->soft.rfc1201; |
349 | } | |
350 | ||
351 | skb = in->skb; | |
352 | ||
353 | lp->hw.copy_from_card(dev, bufnum, ofs + RFC1201_HDR_SIZE, | |
354 | skb->data + skb->len, | |
355 | length - RFC1201_HDR_SIZE); | |
356 | skb_put(skb, length - RFC1201_HDR_SIZE); | |
357 | ||
358 | /* are we done? */ | |
359 | if (in->lastpacket == in->numpackets) { | |
360 | in->skb = NULL; | |
361 | in->lastpacket = in->numpackets = 0; | |
362 | ||
a34c0932 JP |
363 | arc_printk(D_SKB_SIZE, dev, "skb: received %d bytes from %02X (unsplit)\n", |
364 | skb->len, pkt->hard.source); | |
365 | arc_printk(D_SKB_SIZE, dev, "skb: received %d bytes from %02X (split)\n", | |
366 | skb->len, pkt->hard.source); | |
72aeea48 JP |
367 | if (BUGLVL(D_SKB)) |
368 | arcnet_dump_skb(dev, skb, "rx"); | |
1da177e4 LT |
369 | |
370 | skb->protocol = type_trans(skb, dev); | |
371 | netif_rx(skb); | |
1da177e4 LT |
372 | } |
373 | } | |
374 | } | |
375 | ||
1da177e4 LT |
376 | /* Create the ARCnet hard/soft headers for RFC1201. */ |
377 | static int build_header(struct sk_buff *skb, struct net_device *dev, | |
378 | unsigned short type, uint8_t daddr) | |
379 | { | |
454d7c9b | 380 | struct arcnet_local *lp = netdev_priv(dev); |
1da177e4 | 381 | int hdr_size = ARC_HDR_SIZE + RFC1201_HDR_SIZE; |
cb334648 | 382 | struct archdr *pkt = (struct archdr *)skb_push(skb, hdr_size); |
1da177e4 LT |
383 | struct arc_rfc1201 *soft = &pkt->soft.rfc1201; |
384 | ||
385 | /* set the protocol ID according to RFC1201 */ | |
386 | switch (type) { | |
387 | case ETH_P_IP: | |
388 | soft->proto = ARC_P_IP; | |
389 | break; | |
390 | case ETH_P_IPV6: | |
391 | soft->proto = ARC_P_IPV6; | |
392 | break; | |
393 | case ETH_P_ARP: | |
394 | soft->proto = ARC_P_ARP; | |
395 | break; | |
396 | case ETH_P_RARP: | |
397 | soft->proto = ARC_P_RARP; | |
398 | break; | |
399 | case ETH_P_IPX: | |
400 | case ETH_P_802_3: | |
401 | case ETH_P_802_2: | |
402 | soft->proto = ARC_P_IPX; | |
403 | break; | |
404 | case ETH_P_ATALK: | |
405 | soft->proto = ARC_P_ATALK; | |
406 | break; | |
407 | default: | |
a34c0932 JP |
408 | arc_printk(D_NORMAL, dev, "RFC1201: I don't understand protocol %d (%Xh)\n", |
409 | type, type); | |
5803c512 SH |
410 | dev->stats.tx_errors++; |
411 | dev->stats.tx_aborted_errors++; | |
1da177e4 LT |
412 | return 0; |
413 | } | |
414 | ||
f2f0a16b | 415 | /* Set the source hardware address. |
1da177e4 LT |
416 | * |
417 | * This is pretty pointless for most purposes, but it can help in | |
f2f0a16b JP |
418 | * debugging. ARCnet does not allow us to change the source address |
419 | * in the actual packet sent. | |
1da177e4 LT |
420 | */ |
421 | pkt->hard.source = *dev->dev_addr; | |
422 | ||
423 | soft->sequence = htons(lp->rfc1201.sequence++); | |
424 | soft->split_flag = 0; /* split packets are done elsewhere */ | |
425 | ||
426 | /* see linux/net/ethernet/eth.c to see where I got the following */ | |
427 | ||
428 | if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) { | |
f2f0a16b JP |
429 | /* FIXME: fill in the last byte of the dest ipaddr here |
430 | * to better comply with RFC1051 in "noarp" mode. | |
431 | * For now, always broadcasting will probably at least get | |
432 | * packets sent out :) | |
1da177e4 LT |
433 | */ |
434 | pkt->hard.dest = 0; | |
435 | return hdr_size; | |
436 | } | |
437 | /* otherwise, drop in the dest address */ | |
438 | pkt->hard.dest = daddr; | |
439 | return hdr_size; | |
440 | } | |
441 | ||
1da177e4 LT |
442 | static void load_pkt(struct net_device *dev, struct arc_hardware *hard, |
443 | struct arc_rfc1201 *soft, int softlen, int bufnum) | |
444 | { | |
454d7c9b | 445 | struct arcnet_local *lp = netdev_priv(dev); |
1da177e4 LT |
446 | int ofs; |
447 | ||
448 | /* assume length <= XMTU: someone should have handled that by now. */ | |
449 | ||
450 | if (softlen > MinTU) { | |
451 | hard->offset[0] = 0; | |
452 | hard->offset[1] = ofs = 512 - softlen; | |
453 | } else if (softlen > MTU) { /* exception packet - add an extra header */ | |
454 | struct arc_rfc1201 excsoft; | |
455 | ||
456 | excsoft.proto = soft->proto; | |
457 | excsoft.split_flag = 0xff; | |
701181ac | 458 | excsoft.sequence = htons(0xffff); |
1da177e4 LT |
459 | |
460 | hard->offset[0] = 0; | |
461 | ofs = 512 - softlen; | |
462 | hard->offset[1] = ofs - RFC1201_HDR_SIZE; | |
463 | lp->hw.copy_to_card(dev, bufnum, ofs - RFC1201_HDR_SIZE, | |
464 | &excsoft, RFC1201_HDR_SIZE); | |
7f5e760c | 465 | } else { |
1da177e4 | 466 | hard->offset[0] = ofs = 256 - softlen; |
7f5e760c | 467 | } |
1da177e4 LT |
468 | |
469 | lp->hw.copy_to_card(dev, bufnum, 0, hard, ARC_HDR_SIZE); | |
470 | lp->hw.copy_to_card(dev, bufnum, ofs, soft, softlen); | |
471 | ||
472 | lp->lastload_dest = hard->dest; | |
473 | } | |
474 | ||
1da177e4 LT |
475 | static int prepare_tx(struct net_device *dev, struct archdr *pkt, int length, |
476 | int bufnum) | |
477 | { | |
454d7c9b | 478 | struct arcnet_local *lp = netdev_priv(dev); |
1da177e4 LT |
479 | const int maxsegsize = XMTU - RFC1201_HDR_SIZE; |
480 | struct Outgoing *out; | |
481 | ||
a34c0932 JP |
482 | arc_printk(D_DURING, dev, "prepare_tx: txbufs=%d/%d/%d\n", |
483 | lp->next_tx, lp->cur_tx, bufnum); | |
1da177e4 | 484 | |
d6d7d3ed JP |
485 | /* hard header is not included in packet length */ |
486 | length -= ARC_HDR_SIZE; | |
1da177e4 LT |
487 | pkt->soft.rfc1201.split_flag = 0; |
488 | ||
489 | /* need to do a split packet? */ | |
490 | if (length > XMTU) { | |
491 | out = &lp->outgoing; | |
492 | ||
493 | out->length = length - RFC1201_HDR_SIZE; | |
494 | out->dataleft = lp->outgoing.length; | |
495 | out->numsegs = (out->dataleft + maxsegsize - 1) / maxsegsize; | |
496 | out->segnum = 0; | |
497 | ||
a34c0932 JP |
498 | arc_printk(D_DURING, dev, "rfc1201 prep_tx: ready for %d-segment split (%d bytes, seq=%d)\n", |
499 | out->numsegs, out->length, | |
500 | pkt->soft.rfc1201.sequence); | |
1da177e4 LT |
501 | |
502 | return 0; /* not done */ | |
503 | } | |
504 | /* just load the packet into the buffers and send it off */ | |
505 | load_pkt(dev, &pkt->hard, &pkt->soft.rfc1201, length, bufnum); | |
506 | ||
507 | return 1; /* done */ | |
508 | } | |
509 | ||
1da177e4 LT |
510 | static int continue_tx(struct net_device *dev, int bufnum) |
511 | { | |
454d7c9b | 512 | struct arcnet_local *lp = netdev_priv(dev); |
1da177e4 LT |
513 | struct Outgoing *out = &lp->outgoing; |
514 | struct arc_hardware *hard = &out->pkt->hard; | |
515 | struct arc_rfc1201 *soft = &out->pkt->soft.rfc1201, *newsoft; | |
516 | int maxsegsize = XMTU - RFC1201_HDR_SIZE; | |
517 | int seglen; | |
518 | ||
a34c0932 JP |
519 | arc_printk(D_DURING, dev, |
520 | "rfc1201 continue_tx: loading segment %d(+1) of %d (seq=%d)\n", | |
521 | out->segnum, out->numsegs, soft->sequence); | |
1da177e4 LT |
522 | |
523 | /* the "new" soft header comes right before the data chunk */ | |
524 | newsoft = (struct arc_rfc1201 *) | |
525 | (out->pkt->soft.raw + out->length - out->dataleft); | |
526 | ||
527 | if (!out->segnum) /* first packet; newsoft == soft */ | |
528 | newsoft->split_flag = ((out->numsegs - 2) << 1) | 1; | |
529 | else { | |
530 | newsoft->split_flag = out->segnum << 1; | |
531 | newsoft->proto = soft->proto; | |
532 | newsoft->sequence = soft->sequence; | |
533 | } | |
534 | ||
535 | seglen = maxsegsize; | |
536 | if (seglen > out->dataleft) | |
537 | seglen = out->dataleft; | |
538 | out->dataleft -= seglen; | |
539 | ||
540 | load_pkt(dev, hard, newsoft, seglen + RFC1201_HDR_SIZE, bufnum); | |
541 | ||
542 | out->segnum++; | |
543 | if (out->segnum >= out->numsegs) | |
544 | return 1; | |
545 | else | |
546 | return 0; | |
547 | } |