1 /*
2 * eth1394.c -- IPv4 driver for Linux IEEE-1394 Subsystem
3 *
4 * Copyright (C) 2001-2003 Ben Collins <bcollins@debian.org>
5 * 2000 Bonin Franck <boninf@free.fr>
6 * 2003 Steve Kinneberg <kinnebergsteve@acmsystems.com>
7 *
8 * Mainly based on work by Emanuel Pirker and Andreas E. Bombe
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software Foundation,
22 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23 */
24
25 /*
26 * This driver intends to support RFC 2734, which describes a method for
27 * transporting IPv4 datagrams over IEEE-1394 serial busses.
28 *
29 * TODO:
30 * RFC 2734 related:
31 * - Add MCAP. Limited Multicast exists only to 224.0.0.1 and 224.0.0.2.
32 *
33 * Non-RFC 2734 related:
34 * - Handle fragmented skb's coming from the networking layer.
35 * - Move generic GASP reception to core 1394 code
36 * - Convert kmalloc/kfree for link fragments to use kmem_cache_* instead
37 * - Stability improvements
38 * - Performance enhancements
39 * - Consider garbage collecting old partial datagrams after X amount of time
40 */
41
42 #include <linux/module.h>
43
44 #include <linux/kernel.h>
45 #include <linux/slab.h>
46 #include <linux/errno.h>
47 #include <linux/types.h>
48 #include <linux/delay.h>
49 #include <linux/init.h>
50 #include <linux/workqueue.h>
51
52 #include <linux/netdevice.h>
53 #include <linux/inetdevice.h>
54 #include <linux/if_arp.h>
55 #include <linux/if_ether.h>
56 #include <linux/ip.h>
57 #include <linux/in.h>
58 #include <linux/tcp.h>
59 #include <linux/skbuff.h>
60 #include <linux/bitops.h>
61 #include <linux/ethtool.h>
62 #include <asm/uaccess.h>
63 #include <asm/delay.h>
64 #include <asm/unaligned.h>
65 #include <net/arp.h>
66
67 #include "config_roms.h"
68 #include "csr1212.h"
69 #include "eth1394.h"
70 #include "highlevel.h"
71 #include "ieee1394.h"
72 #include "ieee1394_core.h"
73 #include "ieee1394_hotplug.h"
74 #include "ieee1394_transactions.h"
75 #include "ieee1394_types.h"
76 #include "iso.h"
77 #include "nodemgr.h"
78
79 #define ETH1394_PRINT_G(level, fmt, args...) \
80 printk(level "%s: " fmt, driver_name, ## args)
81
82 #define ETH1394_PRINT(level, dev_name, fmt, args...) \
83 printk(level "%s: %s: " fmt, driver_name, dev_name, ## args)
84
85 struct fragment_info {
86 struct list_head list;
87 int offset;
88 int len;
89 };
90
91 struct partial_datagram {
92 struct list_head list;
93 u16 dgl;
94 u16 dg_size;
95 __be16 ether_type;
96 struct sk_buff *skb;
97 char *pbuf;
98 struct list_head frag_info;
99 };
100
101 struct pdg_list {
102 struct list_head list; /* partial datagram list per node */
103 unsigned int sz; /* partial datagram list size per node */
104 spinlock_t lock; /* partial datagram lock */
105 };
106
107 struct eth1394_host_info {
108 struct hpsb_host *host;
109 struct net_device *dev;
110 };
111
112 struct eth1394_node_ref {
113 struct unit_directory *ud;
114 struct list_head list;
115 };
116
117 struct eth1394_node_info {
118 u16 maxpayload; /* max payload */
119 u8 sspd; /* max speed */
120 u64 fifo; /* FIFO address */
121 struct pdg_list pdg; /* partial RX datagram lists */
122 int dgl; /* outgoing datagram label */
123 };
124
125 static const char driver_name[] = "eth1394";
126
127 static struct kmem_cache *packet_task_cache;
128
129 static struct hpsb_highlevel eth1394_highlevel;
130
131 /* Use common.lf to determine header len */
132 static const int hdr_type_len[] = {
133 sizeof(struct eth1394_uf_hdr),
134 sizeof(struct eth1394_ff_hdr),
135 sizeof(struct eth1394_sf_hdr),
136 sizeof(struct eth1394_sf_hdr)
137 };
138
139 static const u16 eth1394_speedto_maxpayload[] = {
140 /* S100, S200, S400, S800, S1600, S3200 */
141 512, 1024, 2048, 4096, 4096, 4096
142 };
143
144 MODULE_AUTHOR("Ben Collins (bcollins@debian.org)");
145 MODULE_DESCRIPTION("IEEE 1394 IPv4 Driver (IPv4-over-1394 as per RFC 2734)");
146 MODULE_LICENSE("GPL");
147
148 /*
149 * The max_partial_datagrams parameter is the maximum number of fragmented
150 * datagrams per node that eth1394 will keep in memory. Providing an upper
151 * bound allows us to limit the amount of memory that partial datagrams
152 * consume in the event that some partial datagrams are never completed.
153 */
154 static int max_partial_datagrams = 25;
155 module_param(max_partial_datagrams, int, S_IRUGO | S_IWUSR);
156 MODULE_PARM_DESC(max_partial_datagrams,
157 "Maximum number of partially received fragmented datagrams "
158 "(default = 25).");
159
160
161 static int ether1394_header(struct sk_buff *skb, struct net_device *dev,
162 unsigned short type, const void *daddr,
163 const void *saddr, unsigned len);
164 static int ether1394_rebuild_header(struct sk_buff *skb);
165 static int ether1394_header_parse(const struct sk_buff *skb,
166 unsigned char *haddr);
167 static int ether1394_header_cache(const struct neighbour *neigh,
168 struct hh_cache *hh);
169 static void ether1394_header_cache_update(struct hh_cache *hh,
170 const struct net_device *dev,
171 const unsigned char *haddr);
172 static int ether1394_tx(struct sk_buff *skb, struct net_device *dev);
173 static void ether1394_iso(struct hpsb_iso *iso);
174
175 static struct ethtool_ops ethtool_ops;
176
177 static int ether1394_write(struct hpsb_host *host, int srcid, int destid,
178 quadlet_t *data, u64 addr, size_t len, u16 flags);
179 static void ether1394_add_host(struct hpsb_host *host);
180 static void ether1394_remove_host(struct hpsb_host *host);
181 static void ether1394_host_reset(struct hpsb_host *host);
182
183 /* Function for incoming 1394 packets */
184 const static struct hpsb_address_ops addr_ops = {
185 .write = ether1394_write,
186 };
187
188 /* Ieee1394 highlevel driver functions */
189 static struct hpsb_highlevel eth1394_highlevel = {
190 .name = driver_name,
191 .add_host = ether1394_add_host,
192 .remove_host = ether1394_remove_host,
193 .host_reset = ether1394_host_reset,
194 };
195
ether1394_recv_init(struct eth1394_priv * priv)196 static int ether1394_recv_init(struct eth1394_priv *priv)
197 {
198 unsigned int iso_buf_size;
199
200 /* FIXME: rawiso limits us to PAGE_SIZE */
201 iso_buf_size = min((unsigned int)PAGE_SIZE,
202 2 * (1U << (priv->host->csr.max_rec + 1)));
203
204 priv->iso = hpsb_iso_recv_init(priv->host,
205 ETHER1394_GASP_BUFFERS * iso_buf_size,
206 ETHER1394_GASP_BUFFERS,
207 priv->broadcast_channel,
208 HPSB_ISO_DMA_PACKET_PER_BUFFER,
209 1, ether1394_iso);
210 if (priv->iso == NULL) {
211 ETH1394_PRINT_G(KERN_ERR, "Failed to allocate IR context\n");
212 priv->bc_state = ETHER1394_BC_ERROR;
213 return -EAGAIN;
214 }
215
216 if (hpsb_iso_recv_start(priv->iso, -1, (1 << 3), -1) < 0)
217 priv->bc_state = ETHER1394_BC_STOPPED;
218 else
219 priv->bc_state = ETHER1394_BC_RUNNING;
220 return 0;
221 }
222
223 /* This is called after an "ifup" */
ether1394_open(struct net_device * dev)224 static int ether1394_open(struct net_device *dev)
225 {
226 struct eth1394_priv *priv = netdev_priv(dev);
227 int ret;
228
229 if (priv->bc_state == ETHER1394_BC_ERROR) {
230 ret = ether1394_recv_init(priv);
231 if (ret)
232 return ret;
233 }
234 netif_start_queue(dev);
235 return 0;
236 }
237
238 /* This is called after an "ifdown" */
ether1394_stop(struct net_device * dev)239 static int ether1394_stop(struct net_device *dev)
240 {
241 /* flush priv->wake */
242 flush_scheduled_work();
243
244 netif_stop_queue(dev);
245 return 0;
246 }
247
248 /* FIXME: What to do if we timeout? I think a host reset is probably in order,
249 * so that's what we do. Should we increment the stat counters too? */
ether1394_tx_timeout(struct net_device * dev)250 static void ether1394_tx_timeout(struct net_device *dev)
251 {
252 struct hpsb_host *host =
253 ((struct eth1394_priv *)netdev_priv(dev))->host;
254
255 ETH1394_PRINT(KERN_ERR, dev->name, "Timeout, resetting host\n");
256 ether1394_host_reset(host);
257 }
258
ether1394_max_mtu(struct hpsb_host * host)259 static inline int ether1394_max_mtu(struct hpsb_host* host)
260 {
261 return (1 << (host->csr.max_rec + 1))
262 - sizeof(union eth1394_hdr) - ETHER1394_GASP_OVERHEAD;
263 }
264
ether1394_change_mtu(struct net_device * dev,int new_mtu)265 static int ether1394_change_mtu(struct net_device *dev, int new_mtu)
266 {
267 int max_mtu;
268
269 if (new_mtu < 68)
270 return -EINVAL;
271
272 max_mtu = ether1394_max_mtu(
273 ((struct eth1394_priv *)netdev_priv(dev))->host);
274 if (new_mtu > max_mtu) {
275 ETH1394_PRINT(KERN_INFO, dev->name,
276 "Local node constrains MTU to %d\n", max_mtu);
277 return -ERANGE;
278 }
279
280 dev->mtu = new_mtu;
281 return 0;
282 }
283
purge_partial_datagram(struct list_head * old)284 static void purge_partial_datagram(struct list_head *old)
285 {
286 struct partial_datagram *pd;
287 struct list_head *lh, *n;
288 struct fragment_info *fi;
289
290 pd = list_entry(old, struct partial_datagram, list);
291
292 list_for_each_safe(lh, n, &pd->frag_info) {
293 fi = list_entry(lh, struct fragment_info, list);
294 list_del(lh);
295 kfree(fi);
296 }
297 list_del(old);
298 kfree_skb(pd->skb);
299 kfree(pd);
300 }
301
302 /******************************************
303 * 1394 bus activity functions
304 ******************************************/
305
eth1394_find_node(struct list_head * inl,struct unit_directory * ud)306 static struct eth1394_node_ref *eth1394_find_node(struct list_head *inl,
307 struct unit_directory *ud)
308 {
309 struct eth1394_node_ref *node;
310
311 list_for_each_entry(node, inl, list)
312 if (node->ud == ud)
313 return node;
314
315 return NULL;
316 }
317
eth1394_find_node_guid(struct list_head * inl,u64 guid)318 static struct eth1394_node_ref *eth1394_find_node_guid(struct list_head *inl,
319 u64 guid)
320 {
321 struct eth1394_node_ref *node;
322
323 list_for_each_entry(node, inl, list)
324 if (node->ud->ne->guid == guid)
325 return node;
326
327 return NULL;
328 }
329
eth1394_find_node_nodeid(struct list_head * inl,nodeid_t nodeid)330 static struct eth1394_node_ref *eth1394_find_node_nodeid(struct list_head *inl,
331 nodeid_t nodeid)
332 {
333 struct eth1394_node_ref *node;
334
335 list_for_each_entry(node, inl, list)
336 if (node->ud->ne->nodeid == nodeid)
337 return node;
338
339 return NULL;
340 }
341
eth1394_new_node(struct eth1394_host_info * hi,struct unit_directory * ud)342 static int eth1394_new_node(struct eth1394_host_info *hi,
343 struct unit_directory *ud)
344 {
345 struct eth1394_priv *priv;
346 struct eth1394_node_ref *new_node;
347 struct eth1394_node_info *node_info;
348
349 new_node = kmalloc(sizeof(*new_node), GFP_KERNEL);
350 if (!new_node)
351 return -ENOMEM;
352
353 node_info = kmalloc(sizeof(*node_info), GFP_KERNEL);
354 if (!node_info) {
355 kfree(new_node);
356 return -ENOMEM;
357 }
358
359 spin_lock_init(&node_info->pdg.lock);
360 INIT_LIST_HEAD(&node_info->pdg.list);
361 node_info->pdg.sz = 0;
362 node_info->fifo = CSR1212_INVALID_ADDR_SPACE;
363
364 ud->device.driver_data = node_info;
365 new_node->ud = ud;
366
367 priv = netdev_priv(hi->dev);
368 list_add_tail(&new_node->list, &priv->ip_node_list);
369 return 0;
370 }
371
eth1394_probe(struct device * dev)372 static int eth1394_probe(struct device *dev)
373 {
374 struct unit_directory *ud;
375 struct eth1394_host_info *hi;
376
377 ud = container_of(dev, struct unit_directory, device);
378 hi = hpsb_get_hostinfo(ð1394_highlevel, ud->ne->host);
379 if (!hi)
380 return -ENOENT;
381
382 return eth1394_new_node(hi, ud);
383 }
384
eth1394_remove(struct device * dev)385 static int eth1394_remove(struct device *dev)
386 {
387 struct unit_directory *ud;
388 struct eth1394_host_info *hi;
389 struct eth1394_priv *priv;
390 struct eth1394_node_ref *old_node;
391 struct eth1394_node_info *node_info;
392 struct list_head *lh, *n;
393 unsigned long flags;
394
395 ud = container_of(dev, struct unit_directory, device);
396 hi = hpsb_get_hostinfo(ð1394_highlevel, ud->ne->host);
397 if (!hi)
398 return -ENOENT;
399
400 priv = netdev_priv(hi->dev);
401
402 old_node = eth1394_find_node(&priv->ip_node_list, ud);
403 if (!old_node)
404 return 0;
405
406 list_del(&old_node->list);
407 kfree(old_node);
408
409 node_info = (struct eth1394_node_info*)ud->device.driver_data;
410
411 spin_lock_irqsave(&node_info->pdg.lock, flags);
412 /* The partial datagram list should be empty, but we'll just
413 * make sure anyway... */
414 list_for_each_safe(lh, n, &node_info->pdg.list)
415 purge_partial_datagram(lh);
416 spin_unlock_irqrestore(&node_info->pdg.lock, flags);
417
418 kfree(node_info);
419 ud->device.driver_data = NULL;
420 return 0;
421 }
422
eth1394_update(struct unit_directory * ud)423 static int eth1394_update(struct unit_directory *ud)
424 {
425 struct eth1394_host_info *hi;
426 struct eth1394_priv *priv;
427 struct eth1394_node_ref *node;
428
429 hi = hpsb_get_hostinfo(ð1394_highlevel, ud->ne->host);
430 if (!hi)
431 return -ENOENT;
432
433 priv = netdev_priv(hi->dev);
434 node = eth1394_find_node(&priv->ip_node_list, ud);
435 if (node)
436 return 0;
437
438 return eth1394_new_node(hi, ud);
439 }
440
441 static struct ieee1394_device_id eth1394_id_table[] = {
442 {
443 .match_flags = (IEEE1394_MATCH_SPECIFIER_ID |
444 IEEE1394_MATCH_VERSION),
445 .specifier_id = ETHER1394_GASP_SPECIFIER_ID,
446 .version = ETHER1394_GASP_VERSION,
447 },
448 {}
449 };
450
451 MODULE_DEVICE_TABLE(ieee1394, eth1394_id_table);
452
453 static struct hpsb_protocol_driver eth1394_proto_driver = {
454 .name = driver_name,
455 .id_table = eth1394_id_table,
456 .update = eth1394_update,
457 .driver = {
458 .probe = eth1394_probe,
459 .remove = eth1394_remove,
460 },
461 };
462
ether1394_reset_priv(struct net_device * dev,int set_mtu)463 static void ether1394_reset_priv(struct net_device *dev, int set_mtu)
464 {
465 unsigned long flags;
466 int i;
467 struct eth1394_priv *priv = netdev_priv(dev);
468 struct hpsb_host *host = priv->host;
469 u64 guid = get_unaligned((u64 *)&(host->csr.rom->bus_info_data[3]));
470 int max_speed = IEEE1394_SPEED_MAX;
471
472 spin_lock_irqsave(&priv->lock, flags);
473
474 memset(priv->ud_list, 0, sizeof(priv->ud_list));
475 priv->bc_maxpayload = 512;
476
477 /* Determine speed limit */
478 /* FIXME: This is broken for nodes with link speed < PHY speed,
479 * and it is suboptimal for S200B...S800B hardware.
480 * The result of nodemgr's speed probe should be used somehow. */
481 for (i = 0; i < host->node_count; i++) {
482 /* take care of S100B...S400B PHY ports */
483 if (host->speed[i] == SELFID_SPEED_UNKNOWN) {
484 max_speed = IEEE1394_SPEED_100;
485 break;
486 }
487 if (max_speed > host->speed[i])
488 max_speed = host->speed[i];
489 }
490 priv->bc_sspd = max_speed;
491
492 if (set_mtu) {
493 /* Use the RFC 2734 default 1500 octets or the maximum payload
494 * as initial MTU */
495 dev->mtu = min(1500, ether1394_max_mtu(host));
496
497 /* Set our hardware address while we're at it */
498 memcpy(dev->dev_addr, &guid, sizeof(u64));
499 memset(dev->broadcast, 0xff, sizeof(u64));
500 }
501
502 spin_unlock_irqrestore(&priv->lock, flags);
503 }
504
505 static const struct header_ops ether1394_header_ops = {
506 .create = ether1394_header,
507 .rebuild = ether1394_rebuild_header,
508 .cache = ether1394_header_cache,
509 .cache_update = ether1394_header_cache_update,
510 .parse = ether1394_header_parse,
511 };
512
513 static const struct net_device_ops ether1394_netdev_ops = {
514 .ndo_open = ether1394_open,
515 .ndo_stop = ether1394_stop,
516 .ndo_start_xmit = ether1394_tx,
517 .ndo_tx_timeout = ether1394_tx_timeout,
518 .ndo_change_mtu = ether1394_change_mtu,
519 };
520
ether1394_init_dev(struct net_device * dev)521 static void ether1394_init_dev(struct net_device *dev)
522 {
523
524 dev->header_ops = ðer1394_header_ops;
525 dev->netdev_ops = ðer1394_netdev_ops;
526
527 SET_ETHTOOL_OPS(dev, ðtool_ops);
528
529 dev->watchdog_timeo = ETHER1394_TIMEOUT;
530 dev->flags = IFF_BROADCAST | IFF_MULTICAST;
531 dev->features = NETIF_F_HIGHDMA;
532 dev->addr_len = ETH1394_ALEN;
533 dev->hard_header_len = ETH1394_HLEN;
534 dev->type = ARPHRD_IEEE1394;
535
536 /* FIXME: This value was copied from ether_setup(). Is it too much? */
537 dev->tx_queue_len = 1000;
538 }
539
540 /*
541 * Wake the queue up after commonly encountered transmit failure conditions are
542 * hopefully over. Currently only tlabel exhaustion is accounted for.
543 */
ether1394_wake_queue(struct work_struct * work)544 static void ether1394_wake_queue(struct work_struct *work)
545 {
546 struct eth1394_priv *priv;
547 struct hpsb_packet *packet;
548
549 priv = container_of(work, struct eth1394_priv, wake);
550 packet = hpsb_alloc_packet(0);
551
552 /* This is really bad, but unjam the queue anyway. */
553 if (!packet)
554 goto out;
555
556 packet->host = priv->host;
557 packet->node_id = priv->wake_node;
558 /*
559 * A transaction label is all we really want. If we get one, it almost
560 * always means we can get a lot more because the ieee1394 core recycled
561 * a whole batch of tlabels, at last.
562 */
563 if (hpsb_get_tlabel(packet) == 0)
564 hpsb_free_tlabel(packet);
565
566 hpsb_free_packet(packet);
567 out:
568 netif_wake_queue(priv->wake_dev);
569 }
570
571 /*
572 * This function is called every time a card is found. It is generally called
573 * when the module is installed. This is where we add all of our ethernet
574 * devices. One for each host.
575 */
ether1394_add_host(struct hpsb_host * host)576 static void ether1394_add_host(struct hpsb_host *host)
577 {
578 struct eth1394_host_info *hi = NULL;
579 struct net_device *dev = NULL;
580 struct eth1394_priv *priv;
581 u64 fifo_addr;
582
583 if (hpsb_config_rom_ip1394_add(host) != 0) {
584 ETH1394_PRINT_G(KERN_ERR, "Can't add IP-over-1394 ROM entry\n");
585 return;
586 }
587
588 fifo_addr = hpsb_allocate_and_register_addrspace(
589 ð1394_highlevel, host, &addr_ops,
590 ETHER1394_REGION_ADDR_LEN, ETHER1394_REGION_ADDR_LEN,
591 CSR1212_INVALID_ADDR_SPACE, CSR1212_INVALID_ADDR_SPACE);
592 if (fifo_addr == CSR1212_INVALID_ADDR_SPACE) {
593 ETH1394_PRINT_G(KERN_ERR, "Cannot register CSR space\n");
594 hpsb_config_rom_ip1394_remove(host);
595 return;
596 }
597
598 dev = alloc_netdev(sizeof(*priv), "eth%d", ether1394_init_dev);
599 if (dev == NULL) {
600 ETH1394_PRINT_G(KERN_ERR, "Out of memory\n");
601 goto out;
602 }
603
604 SET_NETDEV_DEV(dev, &host->device);
605
606 priv = netdev_priv(dev);
607 INIT_LIST_HEAD(&priv->ip_node_list);
608 spin_lock_init(&priv->lock);
609 priv->host = host;
610 priv->local_fifo = fifo_addr;
611 INIT_WORK(&priv->wake, ether1394_wake_queue);
612 priv->wake_dev = dev;
613
614 hi = hpsb_create_hostinfo(ð1394_highlevel, host, sizeof(*hi));
615 if (hi == NULL) {
616 ETH1394_PRINT_G(KERN_ERR, "Out of memory\n");
617 goto out;
618 }
619
620 ether1394_reset_priv(dev, 1);
621
622 if (register_netdev(dev)) {
623 ETH1394_PRINT_G(KERN_ERR, "Cannot register the driver\n");
624 goto out;
625 }
626
627 ETH1394_PRINT(KERN_INFO, dev->name, "IPv4 over IEEE 1394 (fw-host%d)\n",
628 host->id);
629
630 hi->host = host;
631 hi->dev = dev;
632
633 /* Ignore validity in hopes that it will be set in the future. It'll
634 * be checked when the eth device is opened. */
635 priv->broadcast_channel = host->csr.broadcast_channel & 0x3f;
636
637 ether1394_recv_init(priv);
638 return;
639 out:
640 if (dev)
641 free_netdev(dev);
642 if (hi)
643 hpsb_destroy_hostinfo(ð1394_highlevel, host);
644 hpsb_unregister_addrspace(ð1394_highlevel, host, fifo_addr);
645 hpsb_config_rom_ip1394_remove(host);
646 }
647
648 /* Remove a card from our list */
ether1394_remove_host(struct hpsb_host * host)649 static void ether1394_remove_host(struct hpsb_host *host)
650 {
651 struct eth1394_host_info *hi;
652 struct eth1394_priv *priv;
653
654 hi = hpsb_get_hostinfo(ð1394_highlevel, host);
655 if (!hi)
656 return;
657 priv = netdev_priv(hi->dev);
658 hpsb_unregister_addrspace(ð1394_highlevel, host, priv->local_fifo);
659 hpsb_config_rom_ip1394_remove(host);
660 if (priv->iso)
661 hpsb_iso_shutdown(priv->iso);
662 unregister_netdev(hi->dev);
663 free_netdev(hi->dev);
664 }
665
666 /* A bus reset happened */
ether1394_host_reset(struct hpsb_host * host)667 static void ether1394_host_reset(struct hpsb_host *host)
668 {
669 struct eth1394_host_info *hi;
670 struct eth1394_priv *priv;
671 struct net_device *dev;
672 struct list_head *lh, *n;
673 struct eth1394_node_ref *node;
674 struct eth1394_node_info *node_info;
675 unsigned long flags;
676
677 hi = hpsb_get_hostinfo(ð1394_highlevel, host);
678
679 /* This can happen for hosts that we don't use */
680 if (!hi)
681 return;
682
683 dev = hi->dev;
684 priv = netdev_priv(dev);
685
686 /* Reset our private host data, but not our MTU */
687 netif_stop_queue(dev);
688 ether1394_reset_priv(dev, 0);
689
690 list_for_each_entry(node, &priv->ip_node_list, list) {
691 node_info = node->ud->device.driver_data;
692
693 spin_lock_irqsave(&node_info->pdg.lock, flags);
694
695 list_for_each_safe(lh, n, &node_info->pdg.list)
696 purge_partial_datagram(lh);
697
698 INIT_LIST_HEAD(&(node_info->pdg.list));
699 node_info->pdg.sz = 0;
700
701 spin_unlock_irqrestore(&node_info->pdg.lock, flags);
702 }
703
704 netif_wake_queue(dev);
705 }
706
707 /******************************************
708 * HW Header net device functions
709 ******************************************/
710 /* These functions have been adapted from net/ethernet/eth.c */
711
712 /* Create a fake MAC header for an arbitrary protocol layer.
713 * saddr=NULL means use device source address
714 * daddr=NULL means leave destination address (eg unresolved arp). */
ether1394_header(struct sk_buff * skb,struct net_device * dev,unsigned short type,const void * daddr,const void * saddr,unsigned len)715 static int ether1394_header(struct sk_buff *skb, struct net_device *dev,
716 unsigned short type, const void *daddr,
717 const void *saddr, unsigned len)
718 {
719 struct eth1394hdr *eth =
720 (struct eth1394hdr *)skb_push(skb, ETH1394_HLEN);
721
722 eth->h_proto = htons(type);
723
724 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) {
725 memset(eth->h_dest, 0, dev->addr_len);
726 return dev->hard_header_len;
727 }
728
729 if (daddr) {
730 memcpy(eth->h_dest, daddr, dev->addr_len);
731 return dev->hard_header_len;
732 }
733
734 return -dev->hard_header_len;
735 }
736
737 /* Rebuild the faked MAC header. This is called after an ARP
738 * (or in future other address resolution) has completed on this
739 * sk_buff. We now let ARP fill in the other fields.
740 *
741 * This routine CANNOT use cached dst->neigh!
742 * Really, it is used only when dst->neigh is wrong.
743 */
ether1394_rebuild_header(struct sk_buff * skb)744 static int ether1394_rebuild_header(struct sk_buff *skb)
745 {
746 struct eth1394hdr *eth = (struct eth1394hdr *)skb->data;
747
748 if (eth->h_proto == htons(ETH_P_IP))
749 return arp_find((unsigned char *)ð->h_dest, skb);
750
751 ETH1394_PRINT(KERN_DEBUG, skb->dev->name,
752 "unable to resolve type %04x addresses\n",
753 ntohs(eth->h_proto));
754 return 0;
755 }
756
ether1394_header_parse(const struct sk_buff * skb,unsigned char * haddr)757 static int ether1394_header_parse(const struct sk_buff *skb,
758 unsigned char *haddr)
759 {
760 memcpy(haddr, skb->dev->dev_addr, ETH1394_ALEN);
761 return ETH1394_ALEN;
762 }
763
ether1394_header_cache(const struct neighbour * neigh,struct hh_cache * hh)764 static int ether1394_header_cache(const struct neighbour *neigh,
765 struct hh_cache *hh)
766 {
767 __be16 type = hh->hh_type;
768 struct net_device *dev = neigh->dev;
769 struct eth1394hdr *eth =
770 (struct eth1394hdr *)((u8 *)hh->hh_data + 16 - ETH1394_HLEN);
771
772 if (type == htons(ETH_P_802_3))
773 return -1;
774
775 eth->h_proto = type;
776 memcpy(eth->h_dest, neigh->ha, dev->addr_len);
777
778 hh->hh_len = ETH1394_HLEN;
779 return 0;
780 }
781
782 /* Called by Address Resolution module to notify changes in address. */
ether1394_header_cache_update(struct hh_cache * hh,const struct net_device * dev,const unsigned char * haddr)783 static void ether1394_header_cache_update(struct hh_cache *hh,
784 const struct net_device *dev,
785 const unsigned char * haddr)
786 {
787 memcpy((u8 *)hh->hh_data + 16 - ETH1394_HLEN, haddr, dev->addr_len);
788 }
789
790 /******************************************
791 * Datagram reception code
792 ******************************************/
793
794 /* Copied from net/ethernet/eth.c */
ether1394_type_trans(struct sk_buff * skb,struct net_device * dev)795 static __be16 ether1394_type_trans(struct sk_buff *skb, struct net_device *dev)
796 {
797 struct eth1394hdr *eth;
798 unsigned char *rawp;
799
800 skb_reset_mac_header(skb);
801 skb_pull(skb, ETH1394_HLEN);
802 eth = eth1394_hdr(skb);
803
804 if (*eth->h_dest & 1) {
805 if (memcmp(eth->h_dest, dev->broadcast, dev->addr_len) == 0)
806 skb->pkt_type = PACKET_BROADCAST;
807 #if 0
808 else
809 skb->pkt_type = PACKET_MULTICAST;
810 #endif
811 } else {
812 if (memcmp(eth->h_dest, dev->dev_addr, dev->addr_len))
813 skb->pkt_type = PACKET_OTHERHOST;
814 }
815
816 if (ntohs(eth->h_proto) >= 1536)
817 return eth->h_proto;
818
819 rawp = skb->data;
820
821 if (*(unsigned short *)rawp == 0xFFFF)
822 return htons(ETH_P_802_3);
823
824 return htons(ETH_P_802_2);
825 }
826
827 /* Parse an encapsulated IP1394 header into an ethernet frame packet.
828 * We also perform ARP translation here, if need be. */
ether1394_parse_encap(struct sk_buff * skb,struct net_device * dev,nodeid_t srcid,nodeid_t destid,__be16 ether_type)829 static __be16 ether1394_parse_encap(struct sk_buff *skb, struct net_device *dev,
830 nodeid_t srcid, nodeid_t destid,
831 __be16 ether_type)
832 {
833 struct eth1394_priv *priv = netdev_priv(dev);
834 __be64 dest_hw;
835 __be16 ret = 0;
836
837 /* Setup our hw addresses. We use these to build the ethernet header. */
838 if (destid == (LOCAL_BUS | ALL_NODES))
839 dest_hw = ~cpu_to_be64(0); /* broadcast */
840 else
841 dest_hw = cpu_to_be64((u64)priv->host->csr.guid_hi << 32 |
842 priv->host->csr.guid_lo);
843
844 /* If this is an ARP packet, convert it. First, we want to make
845 * use of some of the fields, since they tell us a little bit
846 * about the sending machine. */
847 if (ether_type == htons(ETH_P_ARP)) {
848 struct eth1394_arp *arp1394 = (struct eth1394_arp *)skb->data;
849 struct arphdr *arp = (struct arphdr *)skb->data;
850 unsigned char *arp_ptr = (unsigned char *)(arp + 1);
851 u64 fifo_addr = (u64)ntohs(arp1394->fifo_hi) << 32 |
852 ntohl(arp1394->fifo_lo);
853 u8 max_rec = min(priv->host->csr.max_rec,
854 (u8)(arp1394->max_rec));
855 int sspd = arp1394->sspd;
856 u16 maxpayload;
857 struct eth1394_node_ref *node;
858 struct eth1394_node_info *node_info;
859 __be64 guid;
860
861 /* Sanity check. MacOSX seems to be sending us 131 in this
862 * field (atleast on my Panther G5). Not sure why. */
863 if (sspd > 5 || sspd < 0)
864 sspd = 0;
865
866 maxpayload = min(eth1394_speedto_maxpayload[sspd],
867 (u16)(1 << (max_rec + 1)));
868
869 guid = get_unaligned(&arp1394->s_uniq_id);
870 node = eth1394_find_node_guid(&priv->ip_node_list,
871 be64_to_cpu(guid));
872 if (!node)
873 return cpu_to_be16(0);
874
875 node_info =
876 (struct eth1394_node_info *)node->ud->device.driver_data;
877
878 /* Update our speed/payload/fifo_offset table */
879 node_info->maxpayload = maxpayload;
880 node_info->sspd = sspd;
881 node_info->fifo = fifo_addr;
882
883 /* Now that we're done with the 1394 specific stuff, we'll
884 * need to alter some of the data. Believe it or not, all
885 * that needs to be done is sender_IP_address needs to be
886 * moved, the destination hardware address get stuffed
887 * in and the hardware address length set to 8.
888 *
889 * IMPORTANT: The code below overwrites 1394 specific data
890 * needed above so keep the munging of the data for the
891 * higher level IP stack last. */
892
893 arp->ar_hln = 8;
894 arp_ptr += arp->ar_hln; /* skip over sender unique id */
895 *(u32 *)arp_ptr = arp1394->sip; /* move sender IP addr */
896 arp_ptr += arp->ar_pln; /* skip over sender IP addr */
897
898 if (arp->ar_op == htons(ARPOP_REQUEST))
899 memset(arp_ptr, 0, sizeof(u64));
900 else
901 memcpy(arp_ptr, dev->dev_addr, sizeof(u64));
902 }
903
904 /* Now add the ethernet header. */
905 if (dev_hard_header(skb, dev, ntohs(ether_type), &dest_hw, NULL,
906 skb->len) >= 0)
907 ret = ether1394_type_trans(skb, dev);
908
909 return ret;
910 }
911
fragment_overlap(struct list_head * frag_list,int offset,int len)912 static int fragment_overlap(struct list_head *frag_list, int offset, int len)
913 {
914 struct fragment_info *fi;
915 int end = offset + len;
916
917 list_for_each_entry(fi, frag_list, list)
918 if (offset < fi->offset + fi->len && end > fi->offset)
919 return 1;
920
921 return 0;
922 }
923
find_partial_datagram(struct list_head * pdgl,int dgl)924 static struct list_head *find_partial_datagram(struct list_head *pdgl, int dgl)
925 {
926 struct partial_datagram *pd;
927
928 list_for_each_entry(pd, pdgl, list)
929 if (pd->dgl == dgl)
930 return &pd->list;
931
932 return NULL;
933 }
934
935 /* Assumes that new fragment does not overlap any existing fragments */
new_fragment(struct list_head * frag_info,int offset,int len)936 static int new_fragment(struct list_head *frag_info, int offset, int len)
937 {
938 struct list_head *lh;
939 struct fragment_info *fi, *fi2, *new;
940
941 list_for_each(lh, frag_info) {
942 fi = list_entry(lh, struct fragment_info, list);
943 if (fi->offset + fi->len == offset) {
944 /* The new fragment can be tacked on to the end */
945 fi->len += len;
946 /* Did the new fragment plug a hole? */
947 fi2 = list_entry(lh->next, struct fragment_info, list);
948 if (fi->offset + fi->len == fi2->offset) {
949 /* glue fragments together */
950 fi->len += fi2->len;
951 list_del(lh->next);
952 kfree(fi2);
953 }
954 return 0;
955 } else if (offset + len == fi->offset) {
956 /* The new fragment can be tacked on to the beginning */
957 fi->offset = offset;
958 fi->len += len;
959 /* Did the new fragment plug a hole? */
960 fi2 = list_entry(lh->prev, struct fragment_info, list);
961 if (fi2->offset + fi2->len == fi->offset) {
962 /* glue fragments together */
963 fi2->len += fi->len;
964 list_del(lh);
965 kfree(fi);
966 }
967 return 0;
968 } else if (offset > fi->offset + fi->len) {
969 break;
970 } else if (offset + len < fi->offset) {
971 lh = lh->prev;
972 break;
973 }
974 }
975
976 new = kmalloc(sizeof(*new), GFP_ATOMIC);
977 if (!new)
978 return -ENOMEM;
979
980 new->offset = offset;
981 new->len = len;
982
983 list_add(&new->list, lh);
984 return 0;
985 }
986
new_partial_datagram(struct net_device * dev,struct list_head * pdgl,int dgl,int dg_size,char * frag_buf,int frag_off,int frag_len)987 static int new_partial_datagram(struct net_device *dev, struct list_head *pdgl,
988 int dgl, int dg_size, char *frag_buf,
989 int frag_off, int frag_len)
990 {
991 struct partial_datagram *new;
992
993 new = kmalloc(sizeof(*new), GFP_ATOMIC);
994 if (!new)
995 return -ENOMEM;
996
997 INIT_LIST_HEAD(&new->frag_info);
998
999 if (new_fragment(&new->frag_info, frag_off, frag_len) < 0) {
1000 kfree(new);
1001 return -ENOMEM;
1002 }
1003
1004 new->dgl = dgl;
1005 new->dg_size = dg_size;
1006
1007 new->skb = dev_alloc_skb(dg_size + dev->hard_header_len + 15);
1008 if (!new->skb) {
1009 struct fragment_info *fi = list_entry(new->frag_info.next,
1010 struct fragment_info,
1011 list);
1012 kfree(fi);
1013 kfree(new);
1014 return -ENOMEM;
1015 }
1016
1017 skb_reserve(new->skb, (dev->hard_header_len + 15) & ~15);
1018 new->pbuf = skb_put(new->skb, dg_size);
1019 memcpy(new->pbuf + frag_off, frag_buf, frag_len);
1020
1021 list_add(&new->list, pdgl);
1022 return 0;
1023 }
1024
update_partial_datagram(struct list_head * pdgl,struct list_head * lh,char * frag_buf,int frag_off,int frag_len)1025 static int update_partial_datagram(struct list_head *pdgl, struct list_head *lh,
1026 char *frag_buf, int frag_off, int frag_len)
1027 {
1028 struct partial_datagram *pd =
1029 list_entry(lh, struct partial_datagram, list);
1030
1031 if (new_fragment(&pd->frag_info, frag_off, frag_len) < 0)
1032 return -ENOMEM;
1033
1034 memcpy(pd->pbuf + frag_off, frag_buf, frag_len);
1035
1036 /* Move list entry to beginnig of list so that oldest partial
1037 * datagrams percolate to the end of the list */
1038 list_move(lh, pdgl);
1039 return 0;
1040 }
1041
is_datagram_complete(struct list_head * lh,int dg_size)1042 static int is_datagram_complete(struct list_head *lh, int dg_size)
1043 {
1044 struct partial_datagram *pd;
1045 struct fragment_info *fi;
1046
1047 pd = list_entry(lh, struct partial_datagram, list);
1048 fi = list_entry(pd->frag_info.next, struct fragment_info, list);
1049
1050 return (fi->len == dg_size);
1051 }
1052
1053 /* Packet reception. We convert the IP1394 encapsulation header to an
1054 * ethernet header, and fill it with some of our other fields. This is
1055 * an incoming packet from the 1394 bus. */
ether1394_data_handler(struct net_device * dev,int srcid,int destid,char * buf,int len)1056 static int ether1394_data_handler(struct net_device *dev, int srcid, int destid,
1057 char *buf, int len)
1058 {
1059 struct sk_buff *skb;
1060 unsigned long flags;
1061 struct eth1394_priv *priv = netdev_priv(dev);
1062 union eth1394_hdr *hdr = (union eth1394_hdr *)buf;
1063 __be16 ether_type = cpu_to_be16(0); /* initialized to clear warning */
1064 int hdr_len;
1065 struct unit_directory *ud = priv->ud_list[NODEID_TO_NODE(srcid)];
1066 struct eth1394_node_info *node_info;
1067
1068 if (!ud) {
1069 struct eth1394_node_ref *node;
1070 node = eth1394_find_node_nodeid(&priv->ip_node_list, srcid);
1071 if (unlikely(!node)) {
1072 HPSB_PRINT(KERN_ERR, "ether1394 rx: sender nodeid "
1073 "lookup failure: " NODE_BUS_FMT,
1074 NODE_BUS_ARGS(priv->host, srcid));
1075 dev->stats.rx_dropped++;
1076 return -1;
1077 }
1078 ud = node->ud;
1079
1080 priv->ud_list[NODEID_TO_NODE(srcid)] = ud;
1081 }
1082
1083 node_info = (struct eth1394_node_info *)ud->device.driver_data;
1084
1085 /* First, did we receive a fragmented or unfragmented datagram? */
1086 hdr->words.word1 = ntohs(hdr->words.word1);
1087
1088 hdr_len = hdr_type_len[hdr->common.lf];
1089
1090 if (hdr->common.lf == ETH1394_HDR_LF_UF) {
1091 /* An unfragmented datagram has been received by the ieee1394
1092 * bus. Build an skbuff around it so we can pass it to the
1093 * high level network layer. */
1094
1095 skb = dev_alloc_skb(len + dev->hard_header_len + 15);
1096 if (unlikely(!skb)) {
1097 ETH1394_PRINT_G(KERN_ERR, "Out of memory\n");
1098 dev->stats.rx_dropped++;
1099 return -1;
1100 }
1101 skb_reserve(skb, (dev->hard_header_len + 15) & ~15);
1102 memcpy(skb_put(skb, len - hdr_len), buf + hdr_len,
1103 len - hdr_len);
1104 ether_type = hdr->uf.ether_type;
1105 } else {
1106 /* A datagram fragment has been received, now the fun begins. */
1107
1108 struct list_head *pdgl, *lh;
1109 struct partial_datagram *pd;
1110 int fg_off;
1111 int fg_len = len - hdr_len;
1112 int dg_size;
1113 int dgl;
1114 int retval;
1115 struct pdg_list *pdg = &(node_info->pdg);
1116
1117 hdr->words.word3 = ntohs(hdr->words.word3);
1118 /* The 4th header word is reserved so no need to do ntohs() */
1119
1120 if (hdr->common.lf == ETH1394_HDR_LF_FF) {
1121 ether_type = hdr->ff.ether_type;
1122 dgl = hdr->ff.dgl;
1123 dg_size = hdr->ff.dg_size + 1;
1124 fg_off = 0;
1125 } else {
1126 hdr->words.word2 = ntohs(hdr->words.word2);
1127 dgl = hdr->sf.dgl;
1128 dg_size = hdr->sf.dg_size + 1;
1129 fg_off = hdr->sf.fg_off;
1130 }
1131 spin_lock_irqsave(&pdg->lock, flags);
1132
1133 pdgl = &(pdg->list);
1134 lh = find_partial_datagram(pdgl, dgl);
1135
1136 if (lh == NULL) {
1137 while (pdg->sz >= max_partial_datagrams) {
1138 /* remove the oldest */
1139 purge_partial_datagram(pdgl->prev);
1140 pdg->sz--;
1141 }
1142
1143 retval = new_partial_datagram(dev, pdgl, dgl, dg_size,
1144 buf + hdr_len, fg_off,
1145 fg_len);
1146 if (retval < 0) {
1147 spin_unlock_irqrestore(&pdg->lock, flags);
1148 goto bad_proto;
1149 }
1150 pdg->sz++;
1151 lh = find_partial_datagram(pdgl, dgl);
1152 } else {
1153 pd = list_entry(lh, struct partial_datagram, list);
1154
1155 if (fragment_overlap(&pd->frag_info, fg_off, fg_len)) {
1156 /* Overlapping fragments, obliterate old
1157 * datagram and start new one. */
1158 purge_partial_datagram(lh);
1159 retval = new_partial_datagram(dev, pdgl, dgl,
1160 dg_size,
1161 buf + hdr_len,
1162 fg_off, fg_len);
1163 if (retval < 0) {
1164 pdg->sz--;
1165 spin_unlock_irqrestore(&pdg->lock, flags);
1166 goto bad_proto;
1167 }
1168 } else {
1169 retval = update_partial_datagram(pdgl, lh,
1170 buf + hdr_len,
1171 fg_off, fg_len);
1172 if (retval < 0) {
1173 /* Couldn't save off fragment anyway
1174 * so might as well obliterate the
1175 * datagram now. */
1176 purge_partial_datagram(lh);
1177 pdg->sz--;
1178 spin_unlock_irqrestore(&pdg->lock, flags);
1179 goto bad_proto;
1180 }
1181 } /* fragment overlap */
1182 } /* new datagram or add to existing one */
1183
1184 pd = list_entry(lh, struct partial_datagram, list);
1185
1186 if (hdr->common.lf == ETH1394_HDR_LF_FF)
1187 pd->ether_type = ether_type;
1188
1189 if (is_datagram_complete(lh, dg_size)) {
1190 ether_type = pd->ether_type;
1191 pdg->sz--;
1192 skb = skb_get(pd->skb);
1193 purge_partial_datagram(lh);
1194 spin_unlock_irqrestore(&pdg->lock, flags);
1195 } else {
1196 /* Datagram is not complete, we're done for the
1197 * moment. */
1198 spin_unlock_irqrestore(&pdg->lock, flags);
1199 return 0;
1200 }
1201 } /* unframgented datagram or fragmented one */
1202
1203 /* Write metadata, and then pass to the receive level */
1204 skb->dev = dev;
1205 skb->ip_summed = CHECKSUM_UNNECESSARY; /* don't check it */
1206
1207 /* Parse the encapsulation header. This actually does the job of
1208 * converting to an ethernet frame header, aswell as arp
1209 * conversion if needed. ARP conversion is easier in this
1210 * direction, since we are using ethernet as our backend. */
1211 skb->protocol = ether1394_parse_encap(skb, dev, srcid, destid,
1212 ether_type);
1213
1214 spin_lock_irqsave(&priv->lock, flags);
1215
1216 if (!skb->protocol) {
1217 dev->stats.rx_errors++;
1218 dev->stats.rx_dropped++;
1219 dev_kfree_skb_any(skb);
1220 } else if (netif_rx(skb) == NET_RX_DROP) {
1221 dev->stats.rx_errors++;
1222 dev->stats.rx_dropped++;
1223 } else {
1224 dev->stats.rx_packets++;
1225 dev->stats.rx_bytes += skb->len;
1226 }
1227
1228 spin_unlock_irqrestore(&priv->lock, flags);
1229
1230 bad_proto:
1231 if (netif_queue_stopped(dev))
1232 netif_wake_queue(dev);
1233
1234 return 0;
1235 }
1236
ether1394_write(struct hpsb_host * host,int srcid,int destid,quadlet_t * data,u64 addr,size_t len,u16 flags)1237 static int ether1394_write(struct hpsb_host *host, int srcid, int destid,
1238 quadlet_t *data, u64 addr, size_t len, u16 flags)
1239 {
1240 struct eth1394_host_info *hi;
1241
1242 hi = hpsb_get_hostinfo(ð1394_highlevel, host);
1243 if (unlikely(!hi)) {
1244 ETH1394_PRINT_G(KERN_ERR, "No net device at fw-host%d\n",
1245 host->id);
1246 return RCODE_ADDRESS_ERROR;
1247 }
1248
1249 if (ether1394_data_handler(hi->dev, srcid, destid, (char*)data, len))
1250 return RCODE_ADDRESS_ERROR;
1251 else
1252 return RCODE_COMPLETE;
1253 }
1254
ether1394_iso(struct hpsb_iso * iso)1255 static void ether1394_iso(struct hpsb_iso *iso)
1256 {
1257 __be32 *data;
1258 char *buf;
1259 struct eth1394_host_info *hi;
1260 struct net_device *dev;
1261 struct eth1394_priv *priv;
1262 unsigned int len;
1263 u32 specifier_id;
1264 u16 source_id;
1265 int i;
1266 int nready;
1267
1268 hi = hpsb_get_hostinfo(ð1394_highlevel, iso->host);
1269 if (unlikely(!hi)) {
1270 ETH1394_PRINT_G(KERN_ERR, "No net device at fw-host%d\n",
1271 iso->host->id);
1272 return;
1273 }
1274
1275 dev = hi->dev;
1276
1277 nready = hpsb_iso_n_ready(iso);
1278 for (i = 0; i < nready; i++) {
1279 struct hpsb_iso_packet_info *info =
1280 &iso->infos[(iso->first_packet + i) % iso->buf_packets];
1281 data = (__be32 *)(iso->data_buf.kvirt + info->offset);
1282
1283 /* skip over GASP header */
1284 buf = (char *)data + 8;
1285 len = info->len - 8;
1286
1287 specifier_id = (be32_to_cpu(data[0]) & 0xffff) << 8 |
1288 (be32_to_cpu(data[1]) & 0xff000000) >> 24;
1289 source_id = be32_to_cpu(data[0]) >> 16;
1290
1291 priv = netdev_priv(dev);
1292
1293 if (info->channel != (iso->host->csr.broadcast_channel & 0x3f)
1294 || specifier_id != ETHER1394_GASP_SPECIFIER_ID) {
1295 /* This packet is not for us */
1296 continue;
1297 }
1298 ether1394_data_handler(dev, source_id, LOCAL_BUS | ALL_NODES,
1299 buf, len);
1300 }
1301
1302 hpsb_iso_recv_release_packets(iso, i);
1303
1304 dev->last_rx = jiffies;
1305 }
1306
1307 /******************************************
1308 * Datagram transmission code
1309 ******************************************/
1310
1311 /* Convert a standard ARP packet to 1394 ARP. The first 8 bytes (the entire
1312 * arphdr) is the same format as the ip1394 header, so they overlap. The rest
1313 * needs to be munged a bit. The remainder of the arphdr is formatted based
1314 * on hwaddr len and ipaddr len. We know what they'll be, so it's easy to
1315 * judge.
1316 *
1317 * Now that the EUI is used for the hardware address all we need to do to make
1318 * this work for 1394 is to insert 2 quadlets that contain max_rec size,
1319 * speed, and unicast FIFO address information between the sender_unique_id
1320 * and the IP addresses.
1321 */
ether1394_arp_to_1394arp(struct sk_buff * skb,struct net_device * dev)1322 static void ether1394_arp_to_1394arp(struct sk_buff *skb,
1323 struct net_device *dev)
1324 {
1325 struct eth1394_priv *priv = netdev_priv(dev);
1326 struct arphdr *arp = (struct arphdr *)skb->data;
1327 unsigned char *arp_ptr = (unsigned char *)(arp + 1);
1328 struct eth1394_arp *arp1394 = (struct eth1394_arp *)skb->data;
1329
1330 arp1394->hw_addr_len = 16;
1331 arp1394->sip = *(u32*)(arp_ptr + ETH1394_ALEN);
1332 arp1394->max_rec = priv->host->csr.max_rec;
1333 arp1394->sspd = priv->host->csr.lnk_spd;
1334 arp1394->fifo_hi = htons(priv->local_fifo >> 32);
1335 arp1394->fifo_lo = htonl(priv->local_fifo & ~0x0);
1336 }
1337
1338 /* We need to encapsulate the standard header with our own. We use the
1339 * ethernet header's proto for our own. */
ether1394_encapsulate_prep(unsigned int max_payload,__be16 proto,union eth1394_hdr * hdr,u16 dg_size,u16 dgl)1340 static unsigned int ether1394_encapsulate_prep(unsigned int max_payload,
1341 __be16 proto,
1342 union eth1394_hdr *hdr,
1343 u16 dg_size, u16 dgl)
1344 {
1345 unsigned int adj_max_payload =
1346 max_payload - hdr_type_len[ETH1394_HDR_LF_UF];
1347
1348 /* Does it all fit in one packet? */
1349 if (dg_size <= adj_max_payload) {
1350 hdr->uf.lf = ETH1394_HDR_LF_UF;
1351 hdr->uf.ether_type = proto;
1352 } else {
1353 hdr->ff.lf = ETH1394_HDR_LF_FF;
1354 hdr->ff.ether_type = proto;
1355 hdr->ff.dg_size = dg_size - 1;
1356 hdr->ff.dgl = dgl;
1357 adj_max_payload = max_payload - hdr_type_len[ETH1394_HDR_LF_FF];
1358 }
1359 return DIV_ROUND_UP(dg_size, adj_max_payload);
1360 }
1361
ether1394_encapsulate(struct sk_buff * skb,unsigned int max_payload,union eth1394_hdr * hdr)1362 static unsigned int ether1394_encapsulate(struct sk_buff *skb,
1363 unsigned int max_payload,
1364 union eth1394_hdr *hdr)
1365 {
1366 union eth1394_hdr *bufhdr;
1367 int ftype = hdr->common.lf;
1368 int hdrsz = hdr_type_len[ftype];
1369 unsigned int adj_max_payload = max_payload - hdrsz;
1370
1371 switch (ftype) {
1372 case ETH1394_HDR_LF_UF:
1373 bufhdr = (union eth1394_hdr *)skb_push(skb, hdrsz);
1374 bufhdr->words.word1 = htons(hdr->words.word1);
1375 bufhdr->words.word2 = hdr->words.word2;
1376 break;
1377
1378 case ETH1394_HDR_LF_FF:
1379 bufhdr = (union eth1394_hdr *)skb_push(skb, hdrsz);
1380 bufhdr->words.word1 = htons(hdr->words.word1);
1381 bufhdr->words.word2 = hdr->words.word2;
1382 bufhdr->words.word3 = htons(hdr->words.word3);
1383 bufhdr->words.word4 = 0;
1384
1385 /* Set frag type here for future interior fragments */
1386 hdr->common.lf = ETH1394_HDR_LF_IF;
1387 hdr->sf.fg_off = 0;
1388 break;
1389
1390 default:
1391 hdr->sf.fg_off += adj_max_payload;
1392 bufhdr = (union eth1394_hdr *)skb_pull(skb, adj_max_payload);
1393 if (max_payload >= skb->len)
1394 hdr->common.lf = ETH1394_HDR_LF_LF;
1395 bufhdr->words.word1 = htons(hdr->words.word1);
1396 bufhdr->words.word2 = htons(hdr->words.word2);
1397 bufhdr->words.word3 = htons(hdr->words.word3);
1398 bufhdr->words.word4 = 0;
1399 }
1400 return min(max_payload, skb->len);
1401 }
1402
ether1394_alloc_common_packet(struct hpsb_host * host)1403 static struct hpsb_packet *ether1394_alloc_common_packet(struct hpsb_host *host)
1404 {
1405 struct hpsb_packet *p;
1406
1407 p = hpsb_alloc_packet(0);
1408 if (p) {
1409 p->host = host;
1410 p->generation = get_hpsb_generation(host);
1411 p->type = hpsb_async;
1412 }
1413 return p;
1414 }
1415
ether1394_prep_write_packet(struct hpsb_packet * p,struct hpsb_host * host,nodeid_t node,u64 addr,void * data,int tx_len)1416 static int ether1394_prep_write_packet(struct hpsb_packet *p,
1417 struct hpsb_host *host, nodeid_t node,
1418 u64 addr, void *data, int tx_len)
1419 {
1420 p->node_id = node;
1421
1422 if (hpsb_get_tlabel(p))
1423 return -EAGAIN;
1424
1425 p->tcode = TCODE_WRITEB;
1426 p->header_size = 16;
1427 p->expect_response = 1;
1428 p->header[0] =
1429 p->node_id << 16 | p->tlabel << 10 | 1 << 8 | TCODE_WRITEB << 4;
1430 p->header[1] = host->node_id << 16 | addr >> 32;
1431 p->header[2] = addr & 0xffffffff;
1432 p->header[3] = tx_len << 16;
1433 p->data_size = (tx_len + 3) & ~3;
1434 p->data = data;
1435
1436 return 0;
1437 }
1438
ether1394_prep_gasp_packet(struct hpsb_packet * p,struct eth1394_priv * priv,struct sk_buff * skb,int length)1439 static void ether1394_prep_gasp_packet(struct hpsb_packet *p,
1440 struct eth1394_priv *priv,
1441 struct sk_buff *skb, int length)
1442 {
1443 p->header_size = 4;
1444 p->tcode = TCODE_STREAM_DATA;
1445
1446 p->header[0] = length << 16 | 3 << 14 | priv->broadcast_channel << 8 |
1447 TCODE_STREAM_DATA << 4;
1448 p->data_size = length;
1449 p->data = (quadlet_t *)skb->data - 2;
1450 p->data[0] = cpu_to_be32(priv->host->node_id << 16 |
1451 ETHER1394_GASP_SPECIFIER_ID_HI);
1452 p->data[1] = cpu_to_be32(ETHER1394_GASP_SPECIFIER_ID_LO << 24 |
1453 ETHER1394_GASP_VERSION);
1454
1455 p->speed_code = priv->bc_sspd;
1456
1457 /* prevent hpsb_send_packet() from overriding our speed code */
1458 p->node_id = LOCAL_BUS | ALL_NODES;
1459 }
1460
ether1394_free_packet(struct hpsb_packet * packet)1461 static void ether1394_free_packet(struct hpsb_packet *packet)
1462 {
1463 if (packet->tcode != TCODE_STREAM_DATA)
1464 hpsb_free_tlabel(packet);
1465 hpsb_free_packet(packet);
1466 }
1467
1468 static void ether1394_complete_cb(void *__ptask);
1469
ether1394_send_packet(struct packet_task * ptask,unsigned int tx_len)1470 static int ether1394_send_packet(struct packet_task *ptask, unsigned int tx_len)
1471 {
1472 struct eth1394_priv *priv = ptask->priv;
1473 struct hpsb_packet *packet = NULL;
1474
1475 packet = ether1394_alloc_common_packet(priv->host);
1476 if (!packet)
1477 return -ENOMEM;
1478
1479 if (ptask->tx_type == ETH1394_GASP) {
1480 int length = tx_len + 2 * sizeof(quadlet_t);
1481
1482 ether1394_prep_gasp_packet(packet, priv, ptask->skb, length);
1483 } else if (ether1394_prep_write_packet(packet, priv->host,
1484 ptask->dest_node,
1485 ptask->addr, ptask->skb->data,
1486 tx_len)) {
1487 hpsb_free_packet(packet);
1488 return -EAGAIN;
1489 }
1490
1491 ptask->packet = packet;
1492 hpsb_set_packet_complete_task(ptask->packet, ether1394_complete_cb,
1493 ptask);
1494
1495 if (hpsb_send_packet(packet) < 0) {
1496 ether1394_free_packet(packet);
1497 return -EIO;
1498 }
1499
1500 return 0;
1501 }
1502
1503 /* Task function to be run when a datagram transmission is completed */
ether1394_dg_complete(struct packet_task * ptask,int fail)1504 static void ether1394_dg_complete(struct packet_task *ptask, int fail)
1505 {
1506 struct sk_buff *skb = ptask->skb;
1507 struct net_device *dev = skb->dev;
1508 struct eth1394_priv *priv = netdev_priv(dev);
1509 unsigned long flags;
1510
1511 /* Statistics */
1512 spin_lock_irqsave(&priv->lock, flags);
1513 if (fail) {
1514 dev->stats.tx_dropped++;
1515 dev->stats.tx_errors++;
1516 } else {
1517 dev->stats.tx_bytes += skb->len;
1518 dev->stats.tx_packets++;
1519 }
1520 spin_unlock_irqrestore(&priv->lock, flags);
1521
1522 dev_kfree_skb_any(skb);
1523 kmem_cache_free(packet_task_cache, ptask);
1524 }
1525
1526 /* Callback for when a packet has been sent and the status of that packet is
1527 * known */
ether1394_complete_cb(void * __ptask)1528 static void ether1394_complete_cb(void *__ptask)
1529 {
1530 struct packet_task *ptask = (struct packet_task *)__ptask;
1531 struct hpsb_packet *packet = ptask->packet;
1532 int fail = 0;
1533
1534 if (packet->tcode != TCODE_STREAM_DATA)
1535 fail = hpsb_packet_success(packet);
1536
1537 ether1394_free_packet(packet);
1538
1539 ptask->outstanding_pkts--;
1540 if (ptask->outstanding_pkts > 0 && !fail) {
1541 int tx_len, err;
1542
1543 /* Add the encapsulation header to the fragment */
1544 tx_len = ether1394_encapsulate(ptask->skb, ptask->max_payload,
1545 &ptask->hdr);
1546 err = ether1394_send_packet(ptask, tx_len);
1547 if (err) {
1548 if (err == -EAGAIN)
1549 ETH1394_PRINT_G(KERN_ERR, "Out of tlabels\n");
1550
1551 ether1394_dg_complete(ptask, 1);
1552 }
1553 } else {
1554 ether1394_dg_complete(ptask, fail);
1555 }
1556 }
1557
1558 /* Transmit a packet (called by kernel) */
ether1394_tx(struct sk_buff * skb,struct net_device * dev)1559 static int ether1394_tx(struct sk_buff *skb, struct net_device *dev)
1560 {
1561 struct eth1394hdr hdr_buf;
1562 struct eth1394_priv *priv = netdev_priv(dev);
1563 __be16 proto;
1564 unsigned long flags;
1565 nodeid_t dest_node;
1566 eth1394_tx_type tx_type;
1567 unsigned int tx_len;
1568 unsigned int max_payload;
1569 u16 dg_size;
1570 u16 dgl;
1571 struct packet_task *ptask;
1572 struct eth1394_node_ref *node;
1573 struct eth1394_node_info *node_info = NULL;
1574
1575 ptask = kmem_cache_alloc(packet_task_cache, GFP_ATOMIC);
1576 if (ptask == NULL)
1577 goto fail;
1578
1579 /* XXX Ignore this for now. Noticed that when MacOSX is the IRM,
1580 * it does not set our validity bit. We need to compensate for
1581 * that somewhere else, but not in eth1394. */
1582 #if 0
1583 if ((priv->host->csr.broadcast_channel & 0xc0000000) != 0xc0000000)
1584 goto fail;
1585 #endif
1586
1587 skb = skb_share_check(skb, GFP_ATOMIC);
1588 if (!skb)
1589 goto fail;
1590
1591 /* Get rid of the fake eth1394 header, but first make a copy.
1592 * We might need to rebuild the header on tx failure. */
1593 memcpy(&hdr_buf, skb->data, sizeof(hdr_buf));
1594 skb_pull(skb, ETH1394_HLEN);
1595
1596 proto = hdr_buf.h_proto;
1597 dg_size = skb->len;
1598
1599 /* Set the transmission type for the packet. ARP packets and IP
1600 * broadcast packets are sent via GASP. */
1601 if (memcmp(hdr_buf.h_dest, dev->broadcast, ETH1394_ALEN) == 0 ||
1602 proto == htons(ETH_P_ARP) ||
1603 (proto == htons(ETH_P_IP) &&
1604 IN_MULTICAST(ntohl(ip_hdr(skb)->daddr)))) {
1605 tx_type = ETH1394_GASP;
1606 dest_node = LOCAL_BUS | ALL_NODES;
1607 max_payload = priv->bc_maxpayload - ETHER1394_GASP_OVERHEAD;
1608 BUG_ON(max_payload < 512 - ETHER1394_GASP_OVERHEAD);
1609 dgl = priv->bc_dgl;
1610 if (max_payload < dg_size + hdr_type_len[ETH1394_HDR_LF_UF])
1611 priv->bc_dgl++;
1612 } else {
1613 __be64 guid = get_unaligned((__be64 *)hdr_buf.h_dest);
1614
1615 node = eth1394_find_node_guid(&priv->ip_node_list,
1616 be64_to_cpu(guid));
1617 if (!node)
1618 goto fail;
1619
1620 node_info =
1621 (struct eth1394_node_info *)node->ud->device.driver_data;
1622 if (node_info->fifo == CSR1212_INVALID_ADDR_SPACE)
1623 goto fail;
1624
1625 dest_node = node->ud->ne->nodeid;
1626 max_payload = node_info->maxpayload;
1627 BUG_ON(max_payload < 512 - ETHER1394_GASP_OVERHEAD);
1628
1629 dgl = node_info->dgl;
1630 if (max_payload < dg_size + hdr_type_len[ETH1394_HDR_LF_UF])
1631 node_info->dgl++;
1632 tx_type = ETH1394_WRREQ;
1633 }
1634
1635 /* If this is an ARP packet, convert it */
1636 if (proto == htons(ETH_P_ARP))
1637 ether1394_arp_to_1394arp(skb, dev);
1638
1639 ptask->hdr.words.word1 = 0;
1640 ptask->hdr.words.word2 = 0;
1641 ptask->hdr.words.word3 = 0;
1642 ptask->hdr.words.word4 = 0;
1643 ptask->skb = skb;
1644 ptask->priv = priv;
1645 ptask->tx_type = tx_type;
1646
1647 if (tx_type != ETH1394_GASP) {
1648 u64 addr;
1649
1650 spin_lock_irqsave(&priv->lock, flags);
1651 addr = node_info->fifo;
1652 spin_unlock_irqrestore(&priv->lock, flags);
1653
1654 ptask->addr = addr;
1655 ptask->dest_node = dest_node;
1656 }
1657
1658 ptask->tx_type = tx_type;
1659 ptask->max_payload = max_payload;
1660 ptask->outstanding_pkts = ether1394_encapsulate_prep(max_payload,
1661 proto, &ptask->hdr, dg_size, dgl);
1662
1663 /* Add the encapsulation header to the fragment */
1664 tx_len = ether1394_encapsulate(skb, max_payload, &ptask->hdr);
1665 dev->trans_start = jiffies;
1666 if (ether1394_send_packet(ptask, tx_len)) {
1667 if (dest_node == (LOCAL_BUS | ALL_NODES))
1668 goto fail;
1669
1670 /* At this point we want to restore the packet. When we return
1671 * here with NETDEV_TX_BUSY we will get another entrance in this
1672 * routine with the same skb and we need it to look the same.
1673 * So we pull 4 more bytes, then build the header again. */
1674 skb_pull(skb, 4);
1675 ether1394_header(skb, dev, ntohs(hdr_buf.h_proto),
1676 hdr_buf.h_dest, NULL, 0);
1677
1678 /* Most failures of ether1394_send_packet are recoverable. */
1679 netif_stop_queue(dev);
1680 priv->wake_node = dest_node;
1681 schedule_work(&priv->wake);
1682 kmem_cache_free(packet_task_cache, ptask);
1683 return NETDEV_TX_BUSY;
1684 }
1685
1686 return NETDEV_TX_OK;
1687 fail:
1688 if (ptask)
1689 kmem_cache_free(packet_task_cache, ptask);
1690
1691 if (skb != NULL)
1692 dev_kfree_skb(skb);
1693
1694 spin_lock_irqsave(&priv->lock, flags);
1695 dev->stats.tx_dropped++;
1696 dev->stats.tx_errors++;
1697 spin_unlock_irqrestore(&priv->lock, flags);
1698
1699 /*
1700 * FIXME: According to a patch from 2003-02-26, "returning non-zero
1701 * causes serious problems" here, allegedly. Before that patch,
1702 * -ERRNO was returned which is not appropriate under Linux 2.6.
1703 * Perhaps more needs to be done? Stop the queue in serious
1704 * conditions and restart it elsewhere?
1705 */
1706 /* return NETDEV_TX_BUSY; */
1707 return NETDEV_TX_OK;
1708 }
1709
ether1394_get_drvinfo(struct net_device * dev,struct ethtool_drvinfo * info)1710 static void ether1394_get_drvinfo(struct net_device *dev,
1711 struct ethtool_drvinfo *info)
1712 {
1713 strcpy(info->driver, driver_name);
1714 strcpy(info->bus_info, "ieee1394"); /* FIXME provide more detail? */
1715 }
1716
1717 static struct ethtool_ops ethtool_ops = {
1718 .get_drvinfo = ether1394_get_drvinfo
1719 };
1720
ether1394_init_module(void)1721 static int __init ether1394_init_module(void)
1722 {
1723 int err;
1724
1725 packet_task_cache = kmem_cache_create("packet_task",
1726 sizeof(struct packet_task),
1727 0, 0, NULL);
1728 if (!packet_task_cache)
1729 return -ENOMEM;
1730
1731 hpsb_register_highlevel(ð1394_highlevel);
1732 err = hpsb_register_protocol(ð1394_proto_driver);
1733 if (err) {
1734 hpsb_unregister_highlevel(ð1394_highlevel);
1735 kmem_cache_destroy(packet_task_cache);
1736 }
1737 return err;
1738 }
1739
ether1394_exit_module(void)1740 static void __exit ether1394_exit_module(void)
1741 {
1742 hpsb_unregister_protocol(ð1394_proto_driver);
1743 hpsb_unregister_highlevel(ð1394_highlevel);
1744 kmem_cache_destroy(packet_task_cache);
1745 }
1746
1747 module_init(ether1394_init_module);
1748 module_exit(ether1394_exit_module);
1749