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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 | */ | |
26 | #include <linux/module.h> | |
27 | #include <linux/init.h> | |
28 | #include <linux/if_arp.h> | |
29 | #include <linux/netdevice.h> | |
30 | #include <linux/skbuff.h> | |
31 | #include <linux/arcdevice.h> | |
32 | ||
33 | MODULE_LICENSE("GPL"); | |
34 | #define VERSION "arcnet: RFC1201 \"standard\" (`a') encapsulation support loaded.\n" | |
35 | ||
36 | ||
701181ac | 37 | static __be16 type_trans(struct sk_buff *skb, struct net_device *dev); |
1da177e4 LT |
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 | static int continue_tx(struct net_device *dev, int bufnum); | |
45 | ||
f03aa2d8 | 46 | static struct ArcProto rfc1201_proto = |
1da177e4 LT |
47 | { |
48 | .suffix = 'a', | |
49 | .mtu = 1500, /* could be more, but some receivers can't handle it... */ | |
50 | .is_ip = 1, /* This is for sending IP and ARP packages */ | |
51 | .rx = rx, | |
52 | .build_header = build_header, | |
53 | .prepare_tx = prepare_tx, | |
54 | .continue_tx = continue_tx, | |
55 | .ack_tx = NULL | |
56 | }; | |
57 | ||
58 | ||
59 | static int __init arcnet_rfc1201_init(void) | |
60 | { | |
61 | printk(VERSION); | |
62 | ||
63 | arc_proto_map[ARC_P_IP] | |
64 | = arc_proto_map[ARC_P_IPV6] | |
65 | = arc_proto_map[ARC_P_ARP] | |
66 | = arc_proto_map[ARC_P_RARP] | |
67 | = arc_proto_map[ARC_P_IPX] | |
68 | = arc_proto_map[ARC_P_NOVELL_EC] | |
69 | = &rfc1201_proto; | |
70 | ||
71 | /* if someone else already owns the broadcast, we won't take it */ | |
72 | if (arc_bcast_proto == arc_proto_default) | |
73 | arc_bcast_proto = &rfc1201_proto; | |
74 | ||
75 | return 0; | |
76 | } | |
77 | ||
78 | static void __exit arcnet_rfc1201_exit(void) | |
79 | { | |
80 | arcnet_unregister_proto(&rfc1201_proto); | |
81 | } | |
82 | ||
83 | module_init(arcnet_rfc1201_init); | |
84 | module_exit(arcnet_rfc1201_exit); | |
85 | ||
86 | /* | |
87 | * Determine a packet's protocol ID. | |
88 | * | |
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 LT |
92 | { |
93 | struct archdr *pkt = (struct archdr *) skb->data; | |
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 | ||
101 | if (pkt->hard.dest == 0) | |
102 | skb->pkt_type = PACKET_BROADCAST; | |
103 | else if (dev->flags & IFF_PROMISC) { | |
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 | ||
131 | ||
132 | /* packet receiver */ | |
133 | static void rx(struct net_device *dev, int bufnum, | |
134 | struct archdr *pkthdr, int length) | |
135 | { | |
454d7c9b | 136 | struct arcnet_local *lp = netdev_priv(dev); |
1da177e4 LT |
137 | struct sk_buff *skb; |
138 | struct archdr *pkt = pkthdr; | |
139 | struct arc_rfc1201 *soft = &pkthdr->soft.rfc1201; | |
140 | int saddr = pkt->hard.source, ofs; | |
141 | struct Incoming *in = &lp->rfc1201.incoming[saddr]; | |
142 | ||
143 | BUGMSG(D_DURING, "it's an RFC1201 packet (length=%d)\n", length); | |
144 | ||
145 | if (length >= MinTU) | |
146 | ofs = 512 - length; | |
147 | else | |
148 | ofs = 256 - length; | |
149 | ||
150 | if (soft->split_flag == 0xFF) { /* Exception Packet */ | |
151 | if (length >= 4 + RFC1201_HDR_SIZE) | |
152 | BUGMSG(D_DURING, "compensating for exception packet\n"); | |
153 | else { | |
154 | BUGMSG(D_EXTRA, "short RFC1201 exception packet from %02Xh", | |
155 | saddr); | |
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 */ | |
166 | BUGMSG(D_RX, "incoming is not split (splitflag=%d)\n", | |
167 | soft->split_flag); | |
168 | ||
169 | if (in->skb) { /* already assembling one! */ | |
170 | BUGMSG(D_EXTRA, "aborting assembly (seq=%d) for unsplit packet (splitflag=%d, seq=%d)\n", | |
171 | in->sequence, soft->split_flag, soft->sequence); | |
172 | lp->rfc1201.aborted_seq = soft->sequence; | |
173 | dev_kfree_skb_irq(in->skb); | |
5803c512 SH |
174 | dev->stats.rx_errors++; |
175 | dev->stats.rx_missed_errors++; | |
1da177e4 LT |
176 | in->skb = NULL; |
177 | } | |
178 | in->sequence = soft->sequence; | |
179 | ||
180 | skb = alloc_skb(length + ARC_HDR_SIZE, GFP_ATOMIC); | |
181 | if (skb == NULL) { | |
182 | BUGMSG(D_NORMAL, "Memory squeeze, dropping packet.\n"); | |
5803c512 | 183 | dev->stats.rx_dropped++; |
1da177e4 LT |
184 | return; |
185 | } | |
186 | skb_put(skb, length + ARC_HDR_SIZE); | |
187 | skb->dev = dev; | |
188 | ||
189 | pkt = (struct archdr *) skb->data; | |
190 | soft = &pkt->soft.rfc1201; | |
191 | ||
192 | /* up to sizeof(pkt->soft) has already been copied from the card */ | |
193 | memcpy(pkt, pkthdr, sizeof(struct archdr)); | |
194 | if (length > sizeof(pkt->soft)) | |
195 | lp->hw.copy_from_card(dev, bufnum, ofs + sizeof(pkt->soft), | |
196 | pkt->soft.raw + sizeof(pkt->soft), | |
197 | length - sizeof(pkt->soft)); | |
198 | ||
199 | /* | |
200 | * ARP packets have problems when sent from some DOS systems: the | |
201 | * source address is always 0! So we take the hardware source addr | |
202 | * (which is impossible to fumble) and insert it ourselves. | |
203 | */ | |
204 | if (soft->proto == ARC_P_ARP) { | |
205 | struct arphdr *arp = (struct arphdr *) soft->payload; | |
206 | ||
207 | /* make sure addresses are the right length */ | |
208 | if (arp->ar_hln == 1 && arp->ar_pln == 4) { | |
209 | uint8_t *cptr = (uint8_t *) arp + sizeof(struct arphdr); | |
210 | ||
211 | if (!*cptr) { /* is saddr = 00? */ | |
212 | BUGMSG(D_EXTRA, | |
213 | "ARP source address was 00h, set to %02Xh.\n", | |
214 | saddr); | |
5803c512 | 215 | dev->stats.rx_crc_errors++; |
1da177e4 LT |
216 | *cptr = saddr; |
217 | } else { | |
218 | BUGMSG(D_DURING, "ARP source address (%Xh) is fine.\n", | |
219 | *cptr); | |
220 | } | |
221 | } else { | |
222 | BUGMSG(D_NORMAL, "funny-shaped ARP packet. (%Xh, %Xh)\n", | |
223 | arp->ar_hln, arp->ar_pln); | |
5803c512 SH |
224 | dev->stats.rx_errors++; |
225 | dev->stats.rx_crc_errors++; | |
1da177e4 LT |
226 | } |
227 | } | |
228 | BUGLVL(D_SKB) arcnet_dump_skb(dev, skb, "rx"); | |
229 | ||
230 | skb->protocol = type_trans(skb, dev); | |
231 | netif_rx(skb); | |
1da177e4 LT |
232 | } else { /* split packet */ |
233 | /* | |
234 | * NOTE: MSDOS ARP packet correction should only need to apply to | |
235 | * unsplit packets, since ARP packets are so short. | |
236 | * | |
237 | * My interpretation of the RFC1201 document is that if a packet is | |
238 | * received out of order, the entire assembly process should be | |
239 | * aborted. | |
240 | * | |
241 | * The RFC also mentions "it is possible for successfully received | |
242 | * packets to be retransmitted." As of 0.40 all previously received | |
243 | * packets are allowed, not just the most recent one. | |
244 | * | |
245 | * We allow multiple assembly processes, one for each ARCnet card | |
246 | * possible on the network. Seems rather like a waste of memory, | |
247 | * but there's no other way to be reliable. | |
248 | */ | |
249 | ||
250 | BUGMSG(D_RX, "packet is split (splitflag=%d, seq=%d)\n", | |
251 | soft->split_flag, in->sequence); | |
252 | ||
253 | if (in->skb && in->sequence != soft->sequence) { | |
254 | BUGMSG(D_EXTRA, "wrong seq number (saddr=%d, expected=%d, seq=%d, splitflag=%d)\n", | |
255 | saddr, in->sequence, soft->sequence, | |
256 | soft->split_flag); | |
257 | dev_kfree_skb_irq(in->skb); | |
258 | in->skb = NULL; | |
5803c512 SH |
259 | dev->stats.rx_errors++; |
260 | dev->stats.rx_missed_errors++; | |
1da177e4 LT |
261 | in->lastpacket = in->numpackets = 0; |
262 | } | |
263 | if (soft->split_flag & 1) { /* first packet in split */ | |
264 | BUGMSG(D_RX, "brand new splitpacket (splitflag=%d)\n", | |
265 | soft->split_flag); | |
266 | if (in->skb) { /* already assembling one! */ | |
267 | BUGMSG(D_EXTRA, "aborting previous (seq=%d) assembly " | |
268 | "(splitflag=%d, seq=%d)\n", | |
269 | in->sequence, soft->split_flag, | |
270 | soft->sequence); | |
5803c512 SH |
271 | dev->stats.rx_errors++; |
272 | dev->stats.rx_missed_errors++; | |
1da177e4 LT |
273 | dev_kfree_skb_irq(in->skb); |
274 | } | |
275 | in->sequence = soft->sequence; | |
276 | in->numpackets = ((unsigned) soft->split_flag >> 1) + 2; | |
277 | in->lastpacket = 1; | |
278 | ||
279 | if (in->numpackets > 16) { | |
280 | BUGMSG(D_EXTRA, "incoming packet more than 16 segments; dropping. (splitflag=%d)\n", | |
281 | soft->split_flag); | |
282 | lp->rfc1201.aborted_seq = soft->sequence; | |
5803c512 SH |
283 | dev->stats.rx_errors++; |
284 | dev->stats.rx_length_errors++; | |
1da177e4 LT |
285 | return; |
286 | } | |
287 | in->skb = skb = alloc_skb(508 * in->numpackets + ARC_HDR_SIZE, | |
288 | GFP_ATOMIC); | |
289 | if (skb == NULL) { | |
290 | BUGMSG(D_NORMAL, "(split) memory squeeze, dropping packet.\n"); | |
291 | lp->rfc1201.aborted_seq = soft->sequence; | |
5803c512 | 292 | dev->stats.rx_dropped++; |
1da177e4 LT |
293 | return; |
294 | } | |
295 | skb->dev = dev; | |
296 | pkt = (struct archdr *) skb->data; | |
297 | soft = &pkt->soft.rfc1201; | |
298 | ||
299 | memcpy(pkt, pkthdr, ARC_HDR_SIZE + RFC1201_HDR_SIZE); | |
300 | skb_put(skb, ARC_HDR_SIZE + RFC1201_HDR_SIZE); | |
301 | ||
302 | soft->split_flag = 0; /* end result won't be split */ | |
303 | } else { /* not first packet */ | |
304 | int packetnum = ((unsigned) soft->split_flag >> 1) + 1; | |
305 | ||
306 | /* | |
307 | * if we're not assembling, there's no point trying to | |
308 | * continue. | |
309 | */ | |
310 | if (!in->skb) { | |
311 | if (lp->rfc1201.aborted_seq != soft->sequence) { | |
312 | BUGMSG(D_EXTRA, "can't continue split without starting " | |
313 | "first! (splitflag=%d, seq=%d, aborted=%d)\n", | |
314 | soft->split_flag, soft->sequence, | |
315 | lp->rfc1201.aborted_seq); | |
5803c512 SH |
316 | dev->stats.rx_errors++; |
317 | dev->stats.rx_missed_errors++; | |
1da177e4 LT |
318 | } |
319 | return; | |
320 | } | |
321 | in->lastpacket++; | |
322 | if (packetnum != in->lastpacket) { /* not the right flag! */ | |
323 | /* harmless duplicate? ignore. */ | |
324 | if (packetnum <= in->lastpacket - 1) { | |
325 | BUGMSG(D_EXTRA, "duplicate splitpacket ignored! (splitflag=%d)\n", | |
326 | soft->split_flag); | |
5803c512 SH |
327 | dev->stats.rx_errors++; |
328 | dev->stats.rx_frame_errors++; | |
1da177e4 LT |
329 | return; |
330 | } | |
331 | /* "bad" duplicate, kill reassembly */ | |
332 | BUGMSG(D_EXTRA, "out-of-order splitpacket, reassembly " | |
333 | "(seq=%d) aborted (splitflag=%d, seq=%d)\n", | |
334 | in->sequence, soft->split_flag, soft->sequence); | |
335 | lp->rfc1201.aborted_seq = soft->sequence; | |
336 | dev_kfree_skb_irq(in->skb); | |
337 | in->skb = NULL; | |
5803c512 SH |
338 | dev->stats.rx_errors++; |
339 | dev->stats.rx_missed_errors++; | |
1da177e4 LT |
340 | in->lastpacket = in->numpackets = 0; |
341 | return; | |
342 | } | |
343 | pkt = (struct archdr *) in->skb->data; | |
344 | soft = &pkt->soft.rfc1201; | |
345 | } | |
346 | ||
347 | skb = in->skb; | |
348 | ||
349 | lp->hw.copy_from_card(dev, bufnum, ofs + RFC1201_HDR_SIZE, | |
350 | skb->data + skb->len, | |
351 | length - RFC1201_HDR_SIZE); | |
352 | skb_put(skb, length - RFC1201_HDR_SIZE); | |
353 | ||
354 | /* are we done? */ | |
355 | if (in->lastpacket == in->numpackets) { | |
356 | in->skb = NULL; | |
357 | in->lastpacket = in->numpackets = 0; | |
358 | ||
359 | BUGMSG(D_SKB_SIZE, "skb: received %d bytes from %02X (unsplit)\n", | |
360 | skb->len, pkt->hard.source); | |
361 | BUGMSG(D_SKB_SIZE, "skb: received %d bytes from %02X (split)\n", | |
362 | skb->len, pkt->hard.source); | |
363 | BUGLVL(D_SKB) arcnet_dump_skb(dev, skb, "rx"); | |
364 | ||
365 | skb->protocol = type_trans(skb, dev); | |
366 | netif_rx(skb); | |
1da177e4 LT |
367 | } |
368 | } | |
369 | } | |
370 | ||
371 | ||
372 | /* Create the ARCnet hard/soft headers for RFC1201. */ | |
373 | static int build_header(struct sk_buff *skb, struct net_device *dev, | |
374 | unsigned short type, uint8_t daddr) | |
375 | { | |
454d7c9b | 376 | struct arcnet_local *lp = netdev_priv(dev); |
1da177e4 LT |
377 | int hdr_size = ARC_HDR_SIZE + RFC1201_HDR_SIZE; |
378 | struct archdr *pkt = (struct archdr *) skb_push(skb, hdr_size); | |
379 | struct arc_rfc1201 *soft = &pkt->soft.rfc1201; | |
380 | ||
381 | /* set the protocol ID according to RFC1201 */ | |
382 | switch (type) { | |
383 | case ETH_P_IP: | |
384 | soft->proto = ARC_P_IP; | |
385 | break; | |
386 | case ETH_P_IPV6: | |
387 | soft->proto = ARC_P_IPV6; | |
388 | break; | |
389 | case ETH_P_ARP: | |
390 | soft->proto = ARC_P_ARP; | |
391 | break; | |
392 | case ETH_P_RARP: | |
393 | soft->proto = ARC_P_RARP; | |
394 | break; | |
395 | case ETH_P_IPX: | |
396 | case ETH_P_802_3: | |
397 | case ETH_P_802_2: | |
398 | soft->proto = ARC_P_IPX; | |
399 | break; | |
400 | case ETH_P_ATALK: | |
401 | soft->proto = ARC_P_ATALK; | |
402 | break; | |
403 | default: | |
404 | BUGMSG(D_NORMAL, "RFC1201: I don't understand protocol %d (%Xh)\n", | |
405 | type, type); | |
5803c512 SH |
406 | dev->stats.tx_errors++; |
407 | dev->stats.tx_aborted_errors++; | |
1da177e4 LT |
408 | return 0; |
409 | } | |
410 | ||
411 | /* | |
412 | * Set the source hardware address. | |
413 | * | |
414 | * This is pretty pointless for most purposes, but it can help in | |
415 | * debugging. ARCnet does not allow us to change the source address in | |
416 | * the actual packet sent) | |
417 | */ | |
418 | pkt->hard.source = *dev->dev_addr; | |
419 | ||
420 | soft->sequence = htons(lp->rfc1201.sequence++); | |
421 | soft->split_flag = 0; /* split packets are done elsewhere */ | |
422 | ||
423 | /* see linux/net/ethernet/eth.c to see where I got the following */ | |
424 | ||
425 | if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) { | |
426 | /* | |
427 | * FIXME: fill in the last byte of the dest ipaddr here to better | |
428 | * comply with RFC1051 in "noarp" mode. For now, always broadcasting | |
429 | * will probably at least get packets sent out :) | |
430 | */ | |
431 | pkt->hard.dest = 0; | |
432 | return hdr_size; | |
433 | } | |
434 | /* otherwise, drop in the dest address */ | |
435 | pkt->hard.dest = daddr; | |
436 | return hdr_size; | |
437 | } | |
438 | ||
439 | ||
440 | static void load_pkt(struct net_device *dev, struct arc_hardware *hard, | |
441 | struct arc_rfc1201 *soft, int softlen, int bufnum) | |
442 | { | |
454d7c9b | 443 | struct arcnet_local *lp = netdev_priv(dev); |
1da177e4 LT |
444 | int ofs; |
445 | ||
446 | /* assume length <= XMTU: someone should have handled that by now. */ | |
447 | ||
448 | if (softlen > MinTU) { | |
449 | hard->offset[0] = 0; | |
450 | hard->offset[1] = ofs = 512 - softlen; | |
451 | } else if (softlen > MTU) { /* exception packet - add an extra header */ | |
452 | struct arc_rfc1201 excsoft; | |
453 | ||
454 | excsoft.proto = soft->proto; | |
455 | excsoft.split_flag = 0xff; | |
701181ac | 456 | excsoft.sequence = htons(0xffff); |
1da177e4 LT |
457 | |
458 | hard->offset[0] = 0; | |
459 | ofs = 512 - softlen; | |
460 | hard->offset[1] = ofs - RFC1201_HDR_SIZE; | |
461 | lp->hw.copy_to_card(dev, bufnum, ofs - RFC1201_HDR_SIZE, | |
462 | &excsoft, RFC1201_HDR_SIZE); | |
463 | } else | |
464 | hard->offset[0] = ofs = 256 - softlen; | |
465 | ||
466 | lp->hw.copy_to_card(dev, bufnum, 0, hard, ARC_HDR_SIZE); | |
467 | lp->hw.copy_to_card(dev, bufnum, ofs, soft, softlen); | |
468 | ||
469 | lp->lastload_dest = hard->dest; | |
470 | } | |
471 | ||
472 | ||
473 | static int prepare_tx(struct net_device *dev, struct archdr *pkt, int length, | |
474 | int bufnum) | |
475 | { | |
454d7c9b | 476 | struct arcnet_local *lp = netdev_priv(dev); |
1da177e4 LT |
477 | const int maxsegsize = XMTU - RFC1201_HDR_SIZE; |
478 | struct Outgoing *out; | |
479 | ||
480 | ||
481 | BUGMSG(D_DURING, "prepare_tx: txbufs=%d/%d/%d\n", | |
482 | lp->next_tx, lp->cur_tx, bufnum); | |
483 | ||
484 | length -= ARC_HDR_SIZE; /* hard header is not included in packet length */ | |
485 | pkt->soft.rfc1201.split_flag = 0; | |
486 | ||
487 | /* need to do a split packet? */ | |
488 | if (length > XMTU) { | |
489 | out = &lp->outgoing; | |
490 | ||
491 | out->length = length - RFC1201_HDR_SIZE; | |
492 | out->dataleft = lp->outgoing.length; | |
493 | out->numsegs = (out->dataleft + maxsegsize - 1) / maxsegsize; | |
494 | out->segnum = 0; | |
495 | ||
496 | BUGMSG(D_DURING, "rfc1201 prep_tx: ready for %d-segment split " | |
497 | "(%d bytes, seq=%d)\n", out->numsegs, out->length, | |
498 | pkt->soft.rfc1201.sequence); | |
499 | ||
500 | return 0; /* not done */ | |
501 | } | |
502 | /* just load the packet into the buffers and send it off */ | |
503 | load_pkt(dev, &pkt->hard, &pkt->soft.rfc1201, length, bufnum); | |
504 | ||
505 | return 1; /* done */ | |
506 | } | |
507 | ||
508 | ||
509 | static int continue_tx(struct net_device *dev, int bufnum) | |
510 | { | |
454d7c9b | 511 | struct arcnet_local *lp = netdev_priv(dev); |
1da177e4 LT |
512 | struct Outgoing *out = &lp->outgoing; |
513 | struct arc_hardware *hard = &out->pkt->hard; | |
514 | struct arc_rfc1201 *soft = &out->pkt->soft.rfc1201, *newsoft; | |
515 | int maxsegsize = XMTU - RFC1201_HDR_SIZE; | |
516 | int seglen; | |
517 | ||
518 | BUGMSG(D_DURING, | |
519 | "rfc1201 continue_tx: loading segment %d(+1) of %d (seq=%d)\n", | |
520 | out->segnum, out->numsegs, soft->sequence); | |
521 | ||
522 | /* the "new" soft header comes right before the data chunk */ | |
523 | newsoft = (struct arc_rfc1201 *) | |
524 | (out->pkt->soft.raw + out->length - out->dataleft); | |
525 | ||
526 | if (!out->segnum) /* first packet; newsoft == soft */ | |
527 | newsoft->split_flag = ((out->numsegs - 2) << 1) | 1; | |
528 | else { | |
529 | newsoft->split_flag = out->segnum << 1; | |
530 | newsoft->proto = soft->proto; | |
531 | newsoft->sequence = soft->sequence; | |
532 | } | |
533 | ||
534 | seglen = maxsegsize; | |
535 | if (seglen > out->dataleft) | |
536 | seglen = out->dataleft; | |
537 | out->dataleft -= seglen; | |
538 | ||
539 | load_pkt(dev, hard, newsoft, seglen + RFC1201_HDR_SIZE, bufnum); | |
540 | ||
541 | out->segnum++; | |
542 | if (out->segnum >= out->numsegs) | |
543 | return 1; | |
544 | else | |
545 | return 0; | |
546 | } |