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f421436a AB |
1 | /* Copyright 2011-2013 Autronica Fire and Security AS |
2 | * | |
3 | * This program is free software; you can redistribute it and/or modify it | |
4 | * under the terms of the GNU General Public License as published by the Free | |
5 | * Software Foundation; either version 2 of the License, or (at your option) | |
6 | * any later version. | |
7 | * | |
8 | * Author(s): | |
9 | * 2011-2013 Arvid Brodin, arvid.brodin@xdin.com | |
10 | * | |
11 | * This file contains device methods for creating, using and destroying | |
12 | * virtual HSR devices. | |
13 | */ | |
14 | ||
15 | #include <linux/netdevice.h> | |
16 | #include <linux/skbuff.h> | |
17 | #include <linux/etherdevice.h> | |
18 | #include <linux/if_arp.h> | |
19 | #include <linux/rtnetlink.h> | |
20 | #include <linux/pkt_sched.h> | |
21 | #include "hsr_device.h" | |
22 | #include "hsr_framereg.h" | |
23 | #include "hsr_main.h" | |
24 | ||
25 | ||
26 | static bool is_admin_up(struct net_device *dev) | |
27 | { | |
28 | return dev && (dev->flags & IFF_UP); | |
29 | } | |
30 | ||
31 | static bool is_slave_up(struct net_device *dev) | |
32 | { | |
33 | return dev && is_admin_up(dev) && netif_oper_up(dev); | |
34 | } | |
35 | ||
36 | static void __hsr_set_operstate(struct net_device *dev, int transition) | |
37 | { | |
38 | write_lock_bh(&dev_base_lock); | |
39 | if (dev->operstate != transition) { | |
40 | dev->operstate = transition; | |
41 | write_unlock_bh(&dev_base_lock); | |
42 | netdev_state_change(dev); | |
43 | } else { | |
44 | write_unlock_bh(&dev_base_lock); | |
45 | } | |
46 | } | |
47 | ||
48 | void hsr_set_operstate(struct net_device *hsr_dev, struct net_device *slave1, | |
49 | struct net_device *slave2) | |
50 | { | |
51 | if (!is_admin_up(hsr_dev)) { | |
52 | __hsr_set_operstate(hsr_dev, IF_OPER_DOWN); | |
53 | return; | |
54 | } | |
55 | ||
56 | if (is_slave_up(slave1) || is_slave_up(slave2)) | |
57 | __hsr_set_operstate(hsr_dev, IF_OPER_UP); | |
58 | else | |
59 | __hsr_set_operstate(hsr_dev, IF_OPER_LOWERLAYERDOWN); | |
60 | } | |
61 | ||
62 | void hsr_set_carrier(struct net_device *hsr_dev, struct net_device *slave1, | |
63 | struct net_device *slave2) | |
64 | { | |
65 | if (is_slave_up(slave1) || is_slave_up(slave2)) | |
66 | netif_carrier_on(hsr_dev); | |
67 | else | |
68 | netif_carrier_off(hsr_dev); | |
69 | } | |
70 | ||
71 | ||
72 | void hsr_check_announce(struct net_device *hsr_dev, int old_operstate) | |
73 | { | |
74 | struct hsr_priv *hsr_priv; | |
75 | ||
76 | hsr_priv = netdev_priv(hsr_dev); | |
77 | ||
78 | if ((hsr_dev->operstate == IF_OPER_UP) && (old_operstate != IF_OPER_UP)) { | |
79 | /* Went up */ | |
80 | hsr_priv->announce_count = 0; | |
81 | hsr_priv->announce_timer.expires = jiffies + | |
82 | msecs_to_jiffies(HSR_ANNOUNCE_INTERVAL); | |
83 | add_timer(&hsr_priv->announce_timer); | |
84 | } | |
85 | ||
86 | if ((hsr_dev->operstate != IF_OPER_UP) && (old_operstate == IF_OPER_UP)) | |
87 | /* Went down */ | |
88 | del_timer(&hsr_priv->announce_timer); | |
89 | } | |
90 | ||
91 | ||
92 | int hsr_get_max_mtu(struct hsr_priv *hsr_priv) | |
93 | { | |
94 | int mtu_max; | |
95 | ||
96 | if (hsr_priv->slave[0] && hsr_priv->slave[1]) | |
97 | mtu_max = min(hsr_priv->slave[0]->mtu, hsr_priv->slave[1]->mtu); | |
98 | else if (hsr_priv->slave[0]) | |
99 | mtu_max = hsr_priv->slave[0]->mtu; | |
100 | else if (hsr_priv->slave[1]) | |
101 | mtu_max = hsr_priv->slave[1]->mtu; | |
102 | else | |
103 | mtu_max = HSR_TAGLEN; | |
104 | ||
105 | return mtu_max - HSR_TAGLEN; | |
106 | } | |
107 | ||
108 | static int hsr_dev_change_mtu(struct net_device *dev, int new_mtu) | |
109 | { | |
110 | struct hsr_priv *hsr_priv; | |
111 | ||
112 | hsr_priv = netdev_priv(dev); | |
113 | ||
114 | if (new_mtu > hsr_get_max_mtu(hsr_priv)) { | |
115 | netdev_info(hsr_priv->dev, "A HSR master's MTU cannot be greater than the smallest MTU of its slaves minus the HSR Tag length (%d octets).\n", | |
116 | HSR_TAGLEN); | |
117 | return -EINVAL; | |
118 | } | |
119 | ||
120 | dev->mtu = new_mtu; | |
121 | ||
122 | return 0; | |
123 | } | |
124 | ||
125 | static int hsr_dev_open(struct net_device *dev) | |
126 | { | |
127 | struct hsr_priv *hsr_priv; | |
128 | int i; | |
129 | char *slave_name; | |
130 | ||
131 | hsr_priv = netdev_priv(dev); | |
132 | ||
133 | for (i = 0; i < HSR_MAX_SLAVE; i++) { | |
134 | if (hsr_priv->slave[i]) | |
135 | slave_name = hsr_priv->slave[i]->name; | |
136 | else | |
137 | slave_name = "null"; | |
138 | ||
139 | if (!is_slave_up(hsr_priv->slave[i])) | |
140 | netdev_warn(dev, "Slave %c (%s) is not up; please bring it up to get a working HSR network\n", | |
141 | 'A' + i, slave_name); | |
142 | } | |
143 | ||
144 | return 0; | |
145 | } | |
146 | ||
147 | static int hsr_dev_close(struct net_device *dev) | |
148 | { | |
149 | /* Nothing to do here. We could try to restore the state of the slaves | |
150 | * to what they were before being changed by the hsr master dev's state, | |
151 | * but they might have been changed manually in the mean time too, so | |
152 | * taking them up or down here might be confusing and is probably not a | |
153 | * good idea. | |
154 | */ | |
155 | return 0; | |
156 | } | |
157 | ||
158 | ||
159 | static void hsr_fill_tag(struct hsr_ethhdr *hsr_ethhdr, struct hsr_priv *hsr_priv) | |
160 | { | |
161 | unsigned long irqflags; | |
162 | ||
163 | /* IEC 62439-1:2010, p 48, says the 4-bit "path" field can take values | |
164 | * between 0001-1001 ("ring identifier", for regular HSR frames), | |
165 | * or 1111 ("HSR management", supervision frames). Unfortunately, the | |
166 | * spec writers forgot to explain what a "ring identifier" is, or | |
167 | * how it is used. So we just set this to 0001 for regular frames, | |
168 | * and 1111 for supervision frames. | |
169 | */ | |
170 | set_hsr_tag_path(&hsr_ethhdr->hsr_tag, 0x1); | |
171 | ||
172 | /* IEC 62439-1:2010, p 12: "The link service data unit in an Ethernet | |
173 | * frame is the content of the frame located between the Length/Type | |
174 | * field and the Frame Check Sequence." | |
175 | * | |
176 | * IEC 62439-3, p 48, specifies the "original LPDU" to include the | |
177 | * original "LT" field (what "LT" means is not explained anywhere as | |
178 | * far as I can see - perhaps "Length/Type"?). So LSDU_size might | |
179 | * equal original length + 2. | |
180 | * Also, the fact that this field is not used anywhere (might be used | |
181 | * by a RedBox connecting HSR and PRP nets?) means I cannot test its | |
182 | * correctness. Instead of guessing, I set this to 0 here, to make any | |
183 | * problems immediately apparent. Anyone using this driver with PRP/HSR | |
184 | * RedBoxes might need to fix this... | |
185 | */ | |
186 | set_hsr_tag_LSDU_size(&hsr_ethhdr->hsr_tag, 0); | |
187 | ||
188 | spin_lock_irqsave(&hsr_priv->seqnr_lock, irqflags); | |
189 | hsr_ethhdr->hsr_tag.sequence_nr = htons(hsr_priv->sequence_nr); | |
190 | hsr_priv->sequence_nr++; | |
191 | spin_unlock_irqrestore(&hsr_priv->seqnr_lock, irqflags); | |
192 | ||
193 | hsr_ethhdr->hsr_tag.encap_proto = hsr_ethhdr->ethhdr.h_proto; | |
194 | ||
195 | hsr_ethhdr->ethhdr.h_proto = htons(ETH_P_PRP); | |
196 | } | |
197 | ||
198 | static int slave_xmit(struct sk_buff *skb, struct hsr_priv *hsr_priv, | |
199 | enum hsr_dev_idx dev_idx) | |
200 | { | |
201 | struct hsr_ethhdr *hsr_ethhdr; | |
202 | ||
203 | hsr_ethhdr = (struct hsr_ethhdr *) skb->data; | |
204 | ||
205 | skb->dev = hsr_priv->slave[dev_idx]; | |
206 | ||
207 | hsr_addr_subst_dest(hsr_priv, &hsr_ethhdr->ethhdr, dev_idx); | |
208 | ||
209 | /* Address substitution (IEC62439-3 pp 26, 50): replace mac | |
210 | * address of outgoing frame with that of the outgoing slave's. | |
211 | */ | |
e83abe37 | 212 | ether_addr_copy(hsr_ethhdr->ethhdr.h_source, skb->dev->dev_addr); |
f421436a AB |
213 | |
214 | return dev_queue_xmit(skb); | |
215 | } | |
216 | ||
217 | ||
218 | static int hsr_dev_xmit(struct sk_buff *skb, struct net_device *dev) | |
219 | { | |
220 | struct hsr_priv *hsr_priv; | |
221 | struct hsr_ethhdr *hsr_ethhdr; | |
222 | struct sk_buff *skb2; | |
223 | int res1, res2; | |
224 | ||
225 | hsr_priv = netdev_priv(dev); | |
226 | hsr_ethhdr = (struct hsr_ethhdr *) skb->data; | |
227 | ||
228 | if ((skb->protocol != htons(ETH_P_PRP)) || | |
229 | (hsr_ethhdr->ethhdr.h_proto != htons(ETH_P_PRP))) { | |
230 | hsr_fill_tag(hsr_ethhdr, hsr_priv); | |
231 | skb->protocol = htons(ETH_P_PRP); | |
232 | } | |
233 | ||
234 | skb2 = pskb_copy(skb, GFP_ATOMIC); | |
235 | ||
236 | res1 = NET_XMIT_DROP; | |
237 | if (likely(hsr_priv->slave[HSR_DEV_SLAVE_A])) | |
238 | res1 = slave_xmit(skb, hsr_priv, HSR_DEV_SLAVE_A); | |
239 | ||
240 | res2 = NET_XMIT_DROP; | |
241 | if (likely(skb2 && hsr_priv->slave[HSR_DEV_SLAVE_B])) | |
242 | res2 = slave_xmit(skb2, hsr_priv, HSR_DEV_SLAVE_B); | |
243 | ||
244 | if (likely(res1 == NET_XMIT_SUCCESS || res1 == NET_XMIT_CN || | |
245 | res2 == NET_XMIT_SUCCESS || res2 == NET_XMIT_CN)) { | |
246 | hsr_priv->dev->stats.tx_packets++; | |
247 | hsr_priv->dev->stats.tx_bytes += skb->len; | |
248 | } else { | |
249 | hsr_priv->dev->stats.tx_dropped++; | |
250 | } | |
251 | ||
252 | return NETDEV_TX_OK; | |
253 | } | |
254 | ||
255 | ||
256 | static int hsr_header_create(struct sk_buff *skb, struct net_device *dev, | |
257 | unsigned short type, const void *daddr, | |
258 | const void *saddr, unsigned int len) | |
259 | { | |
260 | int res; | |
261 | ||
262 | /* Make room for the HSR tag now. We will fill it in later (in | |
263 | * hsr_dev_xmit) | |
264 | */ | |
265 | if (skb_headroom(skb) < HSR_TAGLEN + ETH_HLEN) | |
266 | return -ENOBUFS; | |
267 | skb_push(skb, HSR_TAGLEN); | |
268 | ||
269 | /* To allow VLAN/HSR combos we should probably use | |
270 | * res = dev_hard_header(skb, dev, type, daddr, saddr, len + HSR_TAGLEN); | |
271 | * here instead. It would require other changes too, though - e.g. | |
272 | * separate headers for each slave etc... | |
273 | */ | |
274 | res = eth_header(skb, dev, type, daddr, saddr, len + HSR_TAGLEN); | |
275 | if (res <= 0) | |
276 | return res; | |
277 | skb_reset_mac_header(skb); | |
278 | ||
279 | return res + HSR_TAGLEN; | |
280 | } | |
281 | ||
282 | ||
283 | static const struct header_ops hsr_header_ops = { | |
284 | .create = hsr_header_create, | |
285 | .parse = eth_header_parse, | |
286 | }; | |
287 | ||
288 | ||
289 | /* HSR:2010 supervision frames should be padded so that the whole frame, | |
290 | * including headers and FCS, is 64 bytes (without VLAN). | |
291 | */ | |
292 | static int hsr_pad(int size) | |
293 | { | |
294 | const int min_size = ETH_ZLEN - HSR_TAGLEN - ETH_HLEN; | |
295 | ||
296 | if (size >= min_size) | |
297 | return size; | |
298 | return min_size; | |
299 | } | |
300 | ||
301 | static void send_hsr_supervision_frame(struct net_device *hsr_dev, u8 type) | |
302 | { | |
303 | struct hsr_priv *hsr_priv; | |
304 | struct sk_buff *skb; | |
305 | int hlen, tlen; | |
306 | struct hsr_sup_tag *hsr_stag; | |
307 | struct hsr_sup_payload *hsr_sp; | |
308 | unsigned long irqflags; | |
309 | ||
310 | hlen = LL_RESERVED_SPACE(hsr_dev); | |
311 | tlen = hsr_dev->needed_tailroom; | |
312 | skb = alloc_skb(hsr_pad(sizeof(struct hsr_sup_payload)) + hlen + tlen, | |
313 | GFP_ATOMIC); | |
314 | ||
315 | if (skb == NULL) | |
316 | return; | |
317 | ||
318 | hsr_priv = netdev_priv(hsr_dev); | |
319 | ||
320 | skb_reserve(skb, hlen); | |
321 | ||
322 | skb->dev = hsr_dev; | |
323 | skb->protocol = htons(ETH_P_PRP); | |
324 | skb->priority = TC_PRIO_CONTROL; | |
325 | ||
326 | if (dev_hard_header(skb, skb->dev, ETH_P_PRP, | |
327 | hsr_priv->sup_multicast_addr, | |
328 | skb->dev->dev_addr, skb->len) < 0) | |
329 | goto out; | |
330 | ||
331 | skb_pull(skb, sizeof(struct ethhdr)); | |
332 | hsr_stag = (typeof(hsr_stag)) skb->data; | |
333 | ||
334 | set_hsr_stag_path(hsr_stag, 0xf); | |
335 | set_hsr_stag_HSR_Ver(hsr_stag, 0); | |
336 | ||
337 | spin_lock_irqsave(&hsr_priv->seqnr_lock, irqflags); | |
338 | hsr_stag->sequence_nr = htons(hsr_priv->sequence_nr); | |
339 | hsr_priv->sequence_nr++; | |
340 | spin_unlock_irqrestore(&hsr_priv->seqnr_lock, irqflags); | |
341 | ||
342 | hsr_stag->HSR_TLV_Type = type; | |
343 | hsr_stag->HSR_TLV_Length = 12; | |
344 | ||
345 | skb_push(skb, sizeof(struct ethhdr)); | |
346 | ||
347 | /* Payload: MacAddressA */ | |
348 | hsr_sp = (typeof(hsr_sp)) skb_put(skb, sizeof(*hsr_sp)); | |
e83abe37 | 349 | ether_addr_copy(hsr_sp->MacAddressA, hsr_dev->dev_addr); |
f421436a AB |
350 | |
351 | dev_queue_xmit(skb); | |
352 | return; | |
353 | ||
354 | out: | |
355 | kfree_skb(skb); | |
356 | } | |
357 | ||
358 | ||
359 | /* Announce (supervision frame) timer function | |
360 | */ | |
361 | static void hsr_announce(unsigned long data) | |
362 | { | |
363 | struct hsr_priv *hsr_priv; | |
364 | ||
365 | hsr_priv = (struct hsr_priv *) data; | |
366 | ||
367 | if (hsr_priv->announce_count < 3) { | |
368 | send_hsr_supervision_frame(hsr_priv->dev, HSR_TLV_ANNOUNCE); | |
369 | hsr_priv->announce_count++; | |
370 | } else { | |
371 | send_hsr_supervision_frame(hsr_priv->dev, HSR_TLV_LIFE_CHECK); | |
372 | } | |
373 | ||
374 | if (hsr_priv->announce_count < 3) | |
375 | hsr_priv->announce_timer.expires = jiffies + | |
376 | msecs_to_jiffies(HSR_ANNOUNCE_INTERVAL); | |
377 | else | |
378 | hsr_priv->announce_timer.expires = jiffies + | |
379 | msecs_to_jiffies(HSR_LIFE_CHECK_INTERVAL); | |
380 | ||
381 | if (is_admin_up(hsr_priv->dev)) | |
382 | add_timer(&hsr_priv->announce_timer); | |
383 | } | |
384 | ||
385 | ||
386 | static void restore_slaves(struct net_device *hsr_dev) | |
387 | { | |
388 | struct hsr_priv *hsr_priv; | |
389 | int i; | |
390 | int res; | |
391 | ||
392 | hsr_priv = netdev_priv(hsr_dev); | |
393 | ||
394 | rtnl_lock(); | |
395 | ||
396 | /* Restore promiscuity */ | |
397 | for (i = 0; i < HSR_MAX_SLAVE; i++) { | |
398 | if (!hsr_priv->slave[i]) | |
399 | continue; | |
400 | res = dev_set_promiscuity(hsr_priv->slave[i], -1); | |
401 | if (res) | |
402 | netdev_info(hsr_dev, | |
403 | "Cannot restore slave promiscuity (%s, %d)\n", | |
404 | hsr_priv->slave[i]->name, res); | |
405 | } | |
406 | ||
407 | rtnl_unlock(); | |
408 | } | |
409 | ||
410 | static void reclaim_hsr_dev(struct rcu_head *rh) | |
411 | { | |
412 | struct hsr_priv *hsr_priv; | |
413 | ||
414 | hsr_priv = container_of(rh, struct hsr_priv, rcu_head); | |
415 | free_netdev(hsr_priv->dev); | |
416 | } | |
417 | ||
418 | ||
419 | /* According to comments in the declaration of struct net_device, this function | |
420 | * is "Called from unregister, can be used to call free_netdev". Ok then... | |
421 | */ | |
422 | static void hsr_dev_destroy(struct net_device *hsr_dev) | |
423 | { | |
424 | struct hsr_priv *hsr_priv; | |
425 | ||
426 | hsr_priv = netdev_priv(hsr_dev); | |
427 | ||
428 | del_timer(&hsr_priv->announce_timer); | |
429 | unregister_hsr_master(hsr_priv); /* calls list_del_rcu on hsr_priv */ | |
430 | restore_slaves(hsr_dev); | |
431 | call_rcu(&hsr_priv->rcu_head, reclaim_hsr_dev); /* reclaim hsr_priv */ | |
432 | } | |
433 | ||
434 | static const struct net_device_ops hsr_device_ops = { | |
435 | .ndo_change_mtu = hsr_dev_change_mtu, | |
436 | .ndo_open = hsr_dev_open, | |
437 | .ndo_stop = hsr_dev_close, | |
438 | .ndo_start_xmit = hsr_dev_xmit, | |
439 | }; | |
440 | ||
441 | ||
442 | void hsr_dev_setup(struct net_device *dev) | |
443 | { | |
444 | random_ether_addr(dev->dev_addr); | |
445 | ||
446 | ether_setup(dev); | |
447 | dev->header_ops = &hsr_header_ops; | |
448 | dev->netdev_ops = &hsr_device_ops; | |
449 | dev->tx_queue_len = 0; | |
450 | ||
451 | dev->destructor = hsr_dev_destroy; | |
452 | } | |
453 | ||
454 | ||
455 | /* Return true if dev is a HSR master; return false otherwise. | |
456 | */ | |
457 | bool is_hsr_master(struct net_device *dev) | |
458 | { | |
459 | return (dev->netdev_ops->ndo_start_xmit == hsr_dev_xmit); | |
460 | } | |
461 | ||
462 | static int check_slave_ok(struct net_device *dev) | |
463 | { | |
464 | /* Don't allow HSR on non-ethernet like devices */ | |
465 | if ((dev->flags & IFF_LOOPBACK) || (dev->type != ARPHRD_ETHER) || | |
466 | (dev->addr_len != ETH_ALEN)) { | |
467 | netdev_info(dev, "Cannot use loopback or non-ethernet device as HSR slave.\n"); | |
468 | return -EINVAL; | |
469 | } | |
470 | ||
471 | /* Don't allow enslaving hsr devices */ | |
472 | if (is_hsr_master(dev)) { | |
473 | netdev_info(dev, "Cannot create trees of HSR devices.\n"); | |
474 | return -EINVAL; | |
475 | } | |
476 | ||
477 | if (is_hsr_slave(dev)) { | |
478 | netdev_info(dev, "This device is already a HSR slave.\n"); | |
479 | return -EINVAL; | |
480 | } | |
481 | ||
482 | if (dev->priv_flags & IFF_802_1Q_VLAN) { | |
483 | netdev_info(dev, "HSR on top of VLAN is not yet supported in this driver.\n"); | |
484 | return -EINVAL; | |
485 | } | |
486 | ||
487 | /* HSR over bonded devices has not been tested, but I'm not sure it | |
488 | * won't work... | |
489 | */ | |
490 | ||
491 | return 0; | |
492 | } | |
493 | ||
494 | ||
495 | /* Default multicast address for HSR Supervision frames */ | |
e83abe37 | 496 | static const unsigned char def_multicast_addr[ETH_ALEN] __aligned(2) = { |
f421436a AB |
497 | 0x01, 0x15, 0x4e, 0x00, 0x01, 0x00 |
498 | }; | |
499 | ||
500 | int hsr_dev_finalize(struct net_device *hsr_dev, struct net_device *slave[2], | |
501 | unsigned char multicast_spec) | |
502 | { | |
503 | struct hsr_priv *hsr_priv; | |
504 | int i; | |
505 | int res; | |
506 | ||
507 | hsr_priv = netdev_priv(hsr_dev); | |
508 | hsr_priv->dev = hsr_dev; | |
509 | INIT_LIST_HEAD(&hsr_priv->node_db); | |
510 | INIT_LIST_HEAD(&hsr_priv->self_node_db); | |
511 | for (i = 0; i < HSR_MAX_SLAVE; i++) | |
512 | hsr_priv->slave[i] = slave[i]; | |
513 | ||
514 | spin_lock_init(&hsr_priv->seqnr_lock); | |
515 | /* Overflow soon to find bugs easier: */ | |
516 | hsr_priv->sequence_nr = USHRT_MAX - 1024; | |
517 | ||
518 | init_timer(&hsr_priv->announce_timer); | |
519 | hsr_priv->announce_timer.function = hsr_announce; | |
520 | hsr_priv->announce_timer.data = (unsigned long) hsr_priv; | |
521 | ||
e83abe37 | 522 | ether_addr_copy(hsr_priv->sup_multicast_addr, def_multicast_addr); |
f421436a AB |
523 | hsr_priv->sup_multicast_addr[ETH_ALEN - 1] = multicast_spec; |
524 | ||
525 | /* FIXME: should I modify the value of these? | |
526 | * | |
527 | * - hsr_dev->flags - i.e. | |
528 | * IFF_MASTER/SLAVE? | |
529 | * - hsr_dev->priv_flags - i.e. | |
530 | * IFF_EBRIDGE? | |
531 | * IFF_TX_SKB_SHARING? | |
532 | * IFF_HSR_MASTER/SLAVE? | |
533 | */ | |
534 | ||
535 | for (i = 0; i < HSR_MAX_SLAVE; i++) { | |
536 | res = check_slave_ok(slave[i]); | |
537 | if (res) | |
538 | return res; | |
539 | } | |
540 | ||
541 | hsr_dev->features = slave[0]->features & slave[1]->features; | |
542 | /* Prevent recursive tx locking */ | |
543 | hsr_dev->features |= NETIF_F_LLTX; | |
544 | /* VLAN on top of HSR needs testing and probably some work on | |
545 | * hsr_header_create() etc. | |
546 | */ | |
547 | hsr_dev->features |= NETIF_F_VLAN_CHALLENGED; | |
548 | ||
549 | /* Set hsr_dev's MAC address to that of mac_slave1 */ | |
e83abe37 | 550 | ether_addr_copy(hsr_dev->dev_addr, hsr_priv->slave[0]->dev_addr); |
f421436a AB |
551 | |
552 | /* Set required header length */ | |
553 | for (i = 0; i < HSR_MAX_SLAVE; i++) { | |
554 | if (slave[i]->hard_header_len + HSR_TAGLEN > | |
555 | hsr_dev->hard_header_len) | |
556 | hsr_dev->hard_header_len = | |
557 | slave[i]->hard_header_len + HSR_TAGLEN; | |
558 | } | |
559 | ||
560 | /* MTU */ | |
561 | for (i = 0; i < HSR_MAX_SLAVE; i++) | |
562 | if (slave[i]->mtu - HSR_TAGLEN < hsr_dev->mtu) | |
563 | hsr_dev->mtu = slave[i]->mtu - HSR_TAGLEN; | |
564 | ||
565 | /* Make sure the 1st call to netif_carrier_on() gets through */ | |
566 | netif_carrier_off(hsr_dev); | |
567 | ||
568 | /* Promiscuity */ | |
569 | for (i = 0; i < HSR_MAX_SLAVE; i++) { | |
570 | res = dev_set_promiscuity(slave[i], 1); | |
571 | if (res) { | |
572 | netdev_info(hsr_dev, "Cannot set slave promiscuity (%s, %d)\n", | |
573 | slave[i]->name, res); | |
574 | goto fail; | |
575 | } | |
576 | } | |
577 | ||
578 | /* Make sure we recognize frames from ourselves in hsr_rcv() */ | |
579 | res = hsr_create_self_node(&hsr_priv->self_node_db, | |
580 | hsr_dev->dev_addr, | |
581 | hsr_priv->slave[1]->dev_addr); | |
582 | if (res < 0) | |
583 | goto fail; | |
584 | ||
585 | res = register_netdevice(hsr_dev); | |
586 | if (res) | |
587 | goto fail; | |
588 | ||
589 | register_hsr_master(hsr_priv); | |
590 | ||
591 | return 0; | |
592 | ||
593 | fail: | |
594 | restore_slaves(hsr_dev); | |
595 | return res; | |
596 | } |