Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Linux ARCnet driver - RFC1201 (standard) packet encapsulation | |
3 | * | |
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 | */ | |
5a0e3ad6 | 26 | #include <linux/gfp.h> |
1da177e4 LT |
27 | #include <linux/module.h> |
28 | #include <linux/init.h> | |
29 | #include <linux/if_arp.h> | |
30 | #include <linux/netdevice.h> | |
31 | #include <linux/skbuff.h> | |
32 | #include <linux/arcdevice.h> | |
33 | ||
34 | MODULE_LICENSE("GPL"); | |
35 | #define VERSION "arcnet: RFC1201 \"standard\" (`a') encapsulation support loaded.\n" | |
36 | ||
37 | ||
701181ac | 38 | static __be16 type_trans(struct sk_buff *skb, struct net_device *dev); |
1da177e4 LT |
39 | static void rx(struct net_device *dev, int bufnum, |
40 | struct archdr *pkthdr, int length); | |
41 | static int build_header(struct sk_buff *skb, struct net_device *dev, | |
42 | unsigned short type, uint8_t daddr); | |
43 | static int prepare_tx(struct net_device *dev, struct archdr *pkt, int length, | |
44 | int bufnum); | |
45 | static int continue_tx(struct net_device *dev, int bufnum); | |
46 | ||
f03aa2d8 | 47 | static struct ArcProto rfc1201_proto = |
1da177e4 LT |
48 | { |
49 | .suffix = 'a', | |
50 | .mtu = 1500, /* could be more, but some receivers can't handle it... */ | |
51 | .is_ip = 1, /* This is for sending IP and ARP packages */ | |
52 | .rx = rx, | |
53 | .build_header = build_header, | |
54 | .prepare_tx = prepare_tx, | |
55 | .continue_tx = continue_tx, | |
56 | .ack_tx = NULL | |
57 | }; | |
58 | ||
59 | ||
60 | static int __init arcnet_rfc1201_init(void) | |
61 | { | |
62 | printk(VERSION); | |
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 | ||
87 | /* | |
88 | * Determine a packet's protocol ID. | |
89 | * | |
90 | * With ARCnet we have to convert everything to Ethernet-style stuff. | |
91 | */ | |
701181ac | 92 | static __be16 type_trans(struct sk_buff *skb, struct net_device *dev) |
1da177e4 LT |
93 | { |
94 | struct archdr *pkt = (struct archdr *) skb->data; | |
95 | struct arc_rfc1201 *soft = &pkt->soft.rfc1201; | |
1da177e4 LT |
96 | int hdr_size = ARC_HDR_SIZE + RFC1201_HDR_SIZE; |
97 | ||
98 | /* Pull off the arcnet header. */ | |
459a98ed | 99 | skb_reset_mac_header(skb); |
1da177e4 LT |
100 | skb_pull(skb, hdr_size); |
101 | ||
102 | if (pkt->hard.dest == 0) | |
103 | skb->pkt_type = PACKET_BROADCAST; | |
104 | else if (dev->flags & IFF_PROMISC) { | |
105 | /* if we're not sending to ourselves :) */ | |
106 | if (pkt->hard.dest != dev->dev_addr[0]) | |
107 | skb->pkt_type = PACKET_OTHERHOST; | |
108 | } | |
109 | /* now return the protocol number */ | |
110 | switch (soft->proto) { | |
111 | case ARC_P_IP: | |
112 | return htons(ETH_P_IP); | |
113 | case ARC_P_IPV6: | |
114 | return htons(ETH_P_IPV6); | |
115 | case ARC_P_ARP: | |
116 | return htons(ETH_P_ARP); | |
117 | case ARC_P_RARP: | |
118 | return htons(ETH_P_RARP); | |
119 | ||
120 | case ARC_P_IPX: | |
121 | case ARC_P_NOVELL_EC: | |
122 | return htons(ETH_P_802_3); | |
123 | default: | |
5803c512 SH |
124 | dev->stats.rx_errors++; |
125 | dev->stats.rx_crc_errors++; | |
1da177e4 LT |
126 | return 0; |
127 | } | |
128 | ||
129 | return htons(ETH_P_IP); | |
130 | } | |
131 | ||
132 | ||
133 | /* packet receiver */ | |
134 | static void rx(struct net_device *dev, int bufnum, | |
135 | struct archdr *pkthdr, int length) | |
136 | { | |
454d7c9b | 137 | struct arcnet_local *lp = netdev_priv(dev); |
1da177e4 LT |
138 | struct sk_buff *skb; |
139 | struct archdr *pkt = pkthdr; | |
140 | struct arc_rfc1201 *soft = &pkthdr->soft.rfc1201; | |
141 | int saddr = pkt->hard.source, ofs; | |
142 | struct Incoming *in = &lp->rfc1201.incoming[saddr]; | |
143 | ||
144 | BUGMSG(D_DURING, "it's an RFC1201 packet (length=%d)\n", length); | |
145 | ||
146 | if (length >= MinTU) | |
147 | ofs = 512 - length; | |
148 | else | |
149 | ofs = 256 - length; | |
150 | ||
151 | if (soft->split_flag == 0xFF) { /* Exception Packet */ | |
152 | if (length >= 4 + RFC1201_HDR_SIZE) | |
153 | BUGMSG(D_DURING, "compensating for exception packet\n"); | |
154 | else { | |
155 | BUGMSG(D_EXTRA, "short RFC1201 exception packet from %02Xh", | |
156 | saddr); | |
157 | return; | |
158 | } | |
159 | ||
160 | /* skip over 4-byte junkola */ | |
161 | length -= 4; | |
162 | ofs += 4; | |
163 | lp->hw.copy_from_card(dev, bufnum, 512 - length, | |
164 | soft, sizeof(pkt->soft)); | |
165 | } | |
166 | if (!soft->split_flag) { /* not split */ | |
167 | BUGMSG(D_RX, "incoming is not split (splitflag=%d)\n", | |
168 | soft->split_flag); | |
169 | ||
170 | if (in->skb) { /* already assembling one! */ | |
171 | BUGMSG(D_EXTRA, "aborting assembly (seq=%d) for unsplit packet (splitflag=%d, seq=%d)\n", | |
172 | in->sequence, soft->split_flag, soft->sequence); | |
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); | |
182 | if (skb == NULL) { | |
183 | BUGMSG(D_NORMAL, "Memory squeeze, dropping packet.\n"); | |
5803c512 | 184 | dev->stats.rx_dropped++; |
1da177e4 LT |
185 | return; |
186 | } | |
187 | skb_put(skb, length + ARC_HDR_SIZE); | |
188 | skb->dev = dev; | |
189 | ||
190 | pkt = (struct archdr *) skb->data; | |
191 | soft = &pkt->soft.rfc1201; | |
192 | ||
193 | /* up to sizeof(pkt->soft) has already been copied from the card */ | |
194 | memcpy(pkt, pkthdr, sizeof(struct archdr)); | |
195 | if (length > sizeof(pkt->soft)) | |
196 | lp->hw.copy_from_card(dev, bufnum, ofs + sizeof(pkt->soft), | |
197 | pkt->soft.raw + sizeof(pkt->soft), | |
198 | length - sizeof(pkt->soft)); | |
199 | ||
200 | /* | |
201 | * ARP packets have problems when sent from some DOS systems: the | |
202 | * source address is always 0! So we take the hardware source addr | |
203 | * (which is impossible to fumble) and insert it ourselves. | |
204 | */ | |
205 | if (soft->proto == ARC_P_ARP) { | |
206 | struct arphdr *arp = (struct arphdr *) soft->payload; | |
207 | ||
208 | /* make sure addresses are the right length */ | |
209 | if (arp->ar_hln == 1 && arp->ar_pln == 4) { | |
210 | uint8_t *cptr = (uint8_t *) arp + sizeof(struct arphdr); | |
211 | ||
212 | if (!*cptr) { /* is saddr = 00? */ | |
213 | BUGMSG(D_EXTRA, | |
214 | "ARP source address was 00h, set to %02Xh.\n", | |
215 | saddr); | |
5803c512 | 216 | dev->stats.rx_crc_errors++; |
1da177e4 LT |
217 | *cptr = saddr; |
218 | } else { | |
219 | BUGMSG(D_DURING, "ARP source address (%Xh) is fine.\n", | |
220 | *cptr); | |
221 | } | |
222 | } else { | |
223 | BUGMSG(D_NORMAL, "funny-shaped ARP packet. (%Xh, %Xh)\n", | |
224 | arp->ar_hln, arp->ar_pln); | |
5803c512 SH |
225 | dev->stats.rx_errors++; |
226 | dev->stats.rx_crc_errors++; | |
1da177e4 LT |
227 | } |
228 | } | |
229 | BUGLVL(D_SKB) arcnet_dump_skb(dev, skb, "rx"); | |
230 | ||
231 | skb->protocol = type_trans(skb, dev); | |
232 | netif_rx(skb); | |
1da177e4 LT |
233 | } else { /* split packet */ |
234 | /* | |
235 | * NOTE: MSDOS ARP packet correction should only need to apply to | |
236 | * unsplit packets, since ARP packets are so short. | |
237 | * | |
238 | * My interpretation of the RFC1201 document is that if a packet is | |
239 | * received out of order, the entire assembly process should be | |
240 | * aborted. | |
241 | * | |
242 | * The RFC also mentions "it is possible for successfully received | |
243 | * packets to be retransmitted." As of 0.40 all previously received | |
244 | * packets are allowed, not just the most recent one. | |
245 | * | |
246 | * We allow multiple assembly processes, one for each ARCnet card | |
247 | * possible on the network. Seems rather like a waste of memory, | |
248 | * but there's no other way to be reliable. | |
249 | */ | |
250 | ||
251 | BUGMSG(D_RX, "packet is split (splitflag=%d, seq=%d)\n", | |
252 | soft->split_flag, in->sequence); | |
253 | ||
254 | if (in->skb && in->sequence != soft->sequence) { | |
255 | BUGMSG(D_EXTRA, "wrong seq number (saddr=%d, expected=%d, seq=%d, splitflag=%d)\n", | |
256 | saddr, in->sequence, soft->sequence, | |
257 | soft->split_flag); | |
258 | dev_kfree_skb_irq(in->skb); | |
259 | in->skb = NULL; | |
5803c512 SH |
260 | dev->stats.rx_errors++; |
261 | dev->stats.rx_missed_errors++; | |
1da177e4 LT |
262 | in->lastpacket = in->numpackets = 0; |
263 | } | |
264 | if (soft->split_flag & 1) { /* first packet in split */ | |
265 | BUGMSG(D_RX, "brand new splitpacket (splitflag=%d)\n", | |
266 | soft->split_flag); | |
267 | if (in->skb) { /* already assembling one! */ | |
268 | BUGMSG(D_EXTRA, "aborting previous (seq=%d) assembly " | |
269 | "(splitflag=%d, seq=%d)\n", | |
270 | in->sequence, soft->split_flag, | |
271 | soft->sequence); | |
5803c512 SH |
272 | dev->stats.rx_errors++; |
273 | dev->stats.rx_missed_errors++; | |
1da177e4 LT |
274 | dev_kfree_skb_irq(in->skb); |
275 | } | |
276 | in->sequence = soft->sequence; | |
277 | in->numpackets = ((unsigned) soft->split_flag >> 1) + 2; | |
278 | in->lastpacket = 1; | |
279 | ||
280 | if (in->numpackets > 16) { | |
281 | BUGMSG(D_EXTRA, "incoming packet more than 16 segments; dropping. (splitflag=%d)\n", | |
282 | soft->split_flag); | |
283 | lp->rfc1201.aborted_seq = soft->sequence; | |
5803c512 SH |
284 | dev->stats.rx_errors++; |
285 | dev->stats.rx_length_errors++; | |
1da177e4 LT |
286 | return; |
287 | } | |
288 | in->skb = skb = alloc_skb(508 * in->numpackets + ARC_HDR_SIZE, | |
289 | GFP_ATOMIC); | |
290 | if (skb == NULL) { | |
291 | BUGMSG(D_NORMAL, "(split) memory squeeze, dropping packet.\n"); | |
292 | lp->rfc1201.aborted_seq = soft->sequence; | |
5803c512 | 293 | dev->stats.rx_dropped++; |
1da177e4 LT |
294 | return; |
295 | } | |
296 | skb->dev = dev; | |
297 | pkt = (struct archdr *) skb->data; | |
298 | soft = &pkt->soft.rfc1201; | |
299 | ||
300 | memcpy(pkt, pkthdr, ARC_HDR_SIZE + RFC1201_HDR_SIZE); | |
301 | skb_put(skb, ARC_HDR_SIZE + RFC1201_HDR_SIZE); | |
302 | ||
303 | soft->split_flag = 0; /* end result won't be split */ | |
304 | } else { /* not first packet */ | |
305 | int packetnum = ((unsigned) soft->split_flag >> 1) + 1; | |
306 | ||
307 | /* | |
308 | * if we're not assembling, there's no point trying to | |
309 | * continue. | |
310 | */ | |
311 | if (!in->skb) { | |
312 | if (lp->rfc1201.aborted_seq != soft->sequence) { | |
313 | BUGMSG(D_EXTRA, "can't continue split without starting " | |
314 | "first! (splitflag=%d, seq=%d, aborted=%d)\n", | |
315 | soft->split_flag, soft->sequence, | |
316 | lp->rfc1201.aborted_seq); | |
5803c512 SH |
317 | dev->stats.rx_errors++; |
318 | dev->stats.rx_missed_errors++; | |
1da177e4 LT |
319 | } |
320 | return; | |
321 | } | |
322 | in->lastpacket++; | |
323 | if (packetnum != in->lastpacket) { /* not the right flag! */ | |
324 | /* harmless duplicate? ignore. */ | |
325 | if (packetnum <= in->lastpacket - 1) { | |
326 | BUGMSG(D_EXTRA, "duplicate splitpacket ignored! (splitflag=%d)\n", | |
327 | soft->split_flag); | |
5803c512 SH |
328 | dev->stats.rx_errors++; |
329 | dev->stats.rx_frame_errors++; | |
1da177e4 LT |
330 | return; |
331 | } | |
332 | /* "bad" duplicate, kill reassembly */ | |
333 | BUGMSG(D_EXTRA, "out-of-order splitpacket, reassembly " | |
334 | "(seq=%d) aborted (splitflag=%d, seq=%d)\n", | |
335 | in->sequence, soft->split_flag, soft->sequence); | |
336 | lp->rfc1201.aborted_seq = soft->sequence; | |
337 | dev_kfree_skb_irq(in->skb); | |
338 | in->skb = NULL; | |
5803c512 SH |
339 | dev->stats.rx_errors++; |
340 | dev->stats.rx_missed_errors++; | |
1da177e4 LT |
341 | in->lastpacket = in->numpackets = 0; |
342 | return; | |
343 | } | |
344 | pkt = (struct archdr *) in->skb->data; | |
345 | soft = &pkt->soft.rfc1201; | |
346 | } | |
347 | ||
348 | skb = in->skb; | |
349 | ||
350 | lp->hw.copy_from_card(dev, bufnum, ofs + RFC1201_HDR_SIZE, | |
351 | skb->data + skb->len, | |
352 | length - RFC1201_HDR_SIZE); | |
353 | skb_put(skb, length - RFC1201_HDR_SIZE); | |
354 | ||
355 | /* are we done? */ | |
356 | if (in->lastpacket == in->numpackets) { | |
357 | in->skb = NULL; | |
358 | in->lastpacket = in->numpackets = 0; | |
359 | ||
360 | BUGMSG(D_SKB_SIZE, "skb: received %d bytes from %02X (unsplit)\n", | |
361 | skb->len, pkt->hard.source); | |
362 | BUGMSG(D_SKB_SIZE, "skb: received %d bytes from %02X (split)\n", | |
363 | skb->len, pkt->hard.source); | |
364 | BUGLVL(D_SKB) arcnet_dump_skb(dev, skb, "rx"); | |
365 | ||
366 | skb->protocol = type_trans(skb, dev); | |
367 | netif_rx(skb); | |
1da177e4 LT |
368 | } |
369 | } | |
370 | } | |
371 | ||
372 | ||
373 | /* Create the ARCnet hard/soft headers for RFC1201. */ | |
374 | static int build_header(struct sk_buff *skb, struct net_device *dev, | |
375 | unsigned short type, uint8_t daddr) | |
376 | { | |
454d7c9b | 377 | struct arcnet_local *lp = netdev_priv(dev); |
1da177e4 LT |
378 | int hdr_size = ARC_HDR_SIZE + RFC1201_HDR_SIZE; |
379 | struct archdr *pkt = (struct archdr *) skb_push(skb, hdr_size); | |
380 | struct arc_rfc1201 *soft = &pkt->soft.rfc1201; | |
381 | ||
382 | /* set the protocol ID according to RFC1201 */ | |
383 | switch (type) { | |
384 | case ETH_P_IP: | |
385 | soft->proto = ARC_P_IP; | |
386 | break; | |
387 | case ETH_P_IPV6: | |
388 | soft->proto = ARC_P_IPV6; | |
389 | break; | |
390 | case ETH_P_ARP: | |
391 | soft->proto = ARC_P_ARP; | |
392 | break; | |
393 | case ETH_P_RARP: | |
394 | soft->proto = ARC_P_RARP; | |
395 | break; | |
396 | case ETH_P_IPX: | |
397 | case ETH_P_802_3: | |
398 | case ETH_P_802_2: | |
399 | soft->proto = ARC_P_IPX; | |
400 | break; | |
401 | case ETH_P_ATALK: | |
402 | soft->proto = ARC_P_ATALK; | |
403 | break; | |
404 | default: | |
405 | BUGMSG(D_NORMAL, "RFC1201: I don't understand protocol %d (%Xh)\n", | |
406 | type, type); | |
5803c512 SH |
407 | dev->stats.tx_errors++; |
408 | dev->stats.tx_aborted_errors++; | |
1da177e4 LT |
409 | return 0; |
410 | } | |
411 | ||
412 | /* | |
413 | * Set the source hardware address. | |
414 | * | |
415 | * This is pretty pointless for most purposes, but it can help in | |
416 | * debugging. ARCnet does not allow us to change the source address in | |
417 | * the actual packet sent) | |
418 | */ | |
419 | pkt->hard.source = *dev->dev_addr; | |
420 | ||
421 | soft->sequence = htons(lp->rfc1201.sequence++); | |
422 | soft->split_flag = 0; /* split packets are done elsewhere */ | |
423 | ||
424 | /* see linux/net/ethernet/eth.c to see where I got the following */ | |
425 | ||
426 | if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) { | |
427 | /* | |
428 | * FIXME: fill in the last byte of the dest ipaddr here to better | |
429 | * comply with RFC1051 in "noarp" mode. For now, always broadcasting | |
430 | * will probably at least get packets sent out :) | |
431 | */ | |
432 | pkt->hard.dest = 0; | |
433 | return hdr_size; | |
434 | } | |
435 | /* otherwise, drop in the dest address */ | |
436 | pkt->hard.dest = daddr; | |
437 | return hdr_size; | |
438 | } | |
439 | ||
440 | ||
441 | static void load_pkt(struct net_device *dev, struct arc_hardware *hard, | |
442 | struct arc_rfc1201 *soft, int softlen, int bufnum) | |
443 | { | |
454d7c9b | 444 | struct arcnet_local *lp = netdev_priv(dev); |
1da177e4 LT |
445 | int ofs; |
446 | ||
447 | /* assume length <= XMTU: someone should have handled that by now. */ | |
448 | ||
449 | if (softlen > MinTU) { | |
450 | hard->offset[0] = 0; | |
451 | hard->offset[1] = ofs = 512 - softlen; | |
452 | } else if (softlen > MTU) { /* exception packet - add an extra header */ | |
453 | struct arc_rfc1201 excsoft; | |
454 | ||
455 | excsoft.proto = soft->proto; | |
456 | excsoft.split_flag = 0xff; | |
701181ac | 457 | excsoft.sequence = htons(0xffff); |
1da177e4 LT |
458 | |
459 | hard->offset[0] = 0; | |
460 | ofs = 512 - softlen; | |
461 | hard->offset[1] = ofs - RFC1201_HDR_SIZE; | |
462 | lp->hw.copy_to_card(dev, bufnum, ofs - RFC1201_HDR_SIZE, | |
463 | &excsoft, RFC1201_HDR_SIZE); | |
464 | } else | |
465 | hard->offset[0] = ofs = 256 - softlen; | |
466 | ||
467 | lp->hw.copy_to_card(dev, bufnum, 0, hard, ARC_HDR_SIZE); | |
468 | lp->hw.copy_to_card(dev, bufnum, ofs, soft, softlen); | |
469 | ||
470 | lp->lastload_dest = hard->dest; | |
471 | } | |
472 | ||
473 | ||
474 | static int prepare_tx(struct net_device *dev, struct archdr *pkt, int length, | |
475 | int bufnum) | |
476 | { | |
454d7c9b | 477 | struct arcnet_local *lp = netdev_priv(dev); |
1da177e4 LT |
478 | const int maxsegsize = XMTU - RFC1201_HDR_SIZE; |
479 | struct Outgoing *out; | |
480 | ||
481 | ||
482 | BUGMSG(D_DURING, "prepare_tx: txbufs=%d/%d/%d\n", | |
483 | lp->next_tx, lp->cur_tx, bufnum); | |
484 | ||
485 | length -= ARC_HDR_SIZE; /* hard header is not included in packet length */ | |
486 | pkt->soft.rfc1201.split_flag = 0; | |
487 | ||
488 | /* need to do a split packet? */ | |
489 | if (length > XMTU) { | |
490 | out = &lp->outgoing; | |
491 | ||
492 | out->length = length - RFC1201_HDR_SIZE; | |
493 | out->dataleft = lp->outgoing.length; | |
494 | out->numsegs = (out->dataleft + maxsegsize - 1) / maxsegsize; | |
495 | out->segnum = 0; | |
496 | ||
497 | BUGMSG(D_DURING, "rfc1201 prep_tx: ready for %d-segment split " | |
498 | "(%d bytes, seq=%d)\n", out->numsegs, out->length, | |
499 | pkt->soft.rfc1201.sequence); | |
500 | ||
501 | return 0; /* not done */ | |
502 | } | |
503 | /* just load the packet into the buffers and send it off */ | |
504 | load_pkt(dev, &pkt->hard, &pkt->soft.rfc1201, length, bufnum); | |
505 | ||
506 | return 1; /* done */ | |
507 | } | |
508 | ||
509 | ||
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 | ||
519 | BUGMSG(D_DURING, | |
520 | "rfc1201 continue_tx: loading segment %d(+1) of %d (seq=%d)\n", | |
521 | out->segnum, out->numsegs, soft->sequence); | |
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 | } |