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1// SPDX-License-Identifier: GPL-2.0
2/* Copyright 2011-2014 Autronica Fire and Security AS
3 *
4 * Author(s):
5 * 2011-2014 Arvid Brodin, arvid.brodin@alten.se
6 * This file contains device methods for creating, using and destroying
7 * virtual HSR or PRP devices.
8 */
9
10#include <linux/netdevice.h>
11#include <linux/skbuff.h>
12#include <linux/etherdevice.h>
13#include <linux/rtnetlink.h>
14#include <linux/pkt_sched.h>
15#include "hsr_device.h"
16#include "hsr_slave.h"
17#include "hsr_framereg.h"
18#include "hsr_main.h"
19#include "hsr_forward.h"
20
21static bool is_admin_up(struct net_device *dev)
22{
23 return dev && (dev->flags & IFF_UP);
24}
25
26static bool is_slave_up(struct net_device *dev)
27{
28 return dev && is_admin_up(dev) && netif_oper_up(dev);
29}
30
31static void __hsr_set_operstate(struct net_device *dev, int transition)
32{
33 write_lock(&dev_base_lock);
34 if (dev->operstate != transition) {
35 dev->operstate = transition;
36 write_unlock(&dev_base_lock);
37 netdev_state_change(dev);
38 } else {
39 write_unlock(&dev_base_lock);
40 }
41}
42
43static void hsr_set_operstate(struct hsr_port *master, bool has_carrier)
44{
45 if (!is_admin_up(master->dev)) {
46 __hsr_set_operstate(master->dev, IF_OPER_DOWN);
47 return;
48 }
49
50 if (has_carrier)
51 __hsr_set_operstate(master->dev, IF_OPER_UP);
52 else
53 __hsr_set_operstate(master->dev, IF_OPER_LOWERLAYERDOWN);
54}
55
56static bool hsr_check_carrier(struct hsr_port *master)
57{
58 struct hsr_port *port;
59
60 ASSERT_RTNL();
61
62 hsr_for_each_port(master->hsr, port) {
63 if (port->type != HSR_PT_MASTER && is_slave_up(port->dev)) {
64 netif_carrier_on(master->dev);
65 return true;
66 }
67 }
68
69 netif_carrier_off(master->dev);
70
71 return false;
72}
73
74static void hsr_check_announce(struct net_device *hsr_dev,
75 unsigned char old_operstate)
76{
77 struct hsr_priv *hsr;
78
79 hsr = netdev_priv(hsr_dev);
80
81 if (hsr_dev->operstate == IF_OPER_UP && old_operstate != IF_OPER_UP) {
82 /* Went up */
83 hsr->announce_count = 0;
84 mod_timer(&hsr->announce_timer,
85 jiffies + msecs_to_jiffies(HSR_ANNOUNCE_INTERVAL));
86 }
87
88 if (hsr_dev->operstate != IF_OPER_UP && old_operstate == IF_OPER_UP)
89 /* Went down */
90 del_timer(&hsr->announce_timer);
91}
92
93void hsr_check_carrier_and_operstate(struct hsr_priv *hsr)
94{
95 struct hsr_port *master;
96 unsigned char old_operstate;
97 bool has_carrier;
98
99 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
100 /* netif_stacked_transfer_operstate() cannot be used here since
101 * it doesn't set IF_OPER_LOWERLAYERDOWN (?)
102 */
103 old_operstate = master->dev->operstate;
104 has_carrier = hsr_check_carrier(master);
105 hsr_set_operstate(master, has_carrier);
106 hsr_check_announce(master->dev, old_operstate);
107}
108
109int hsr_get_max_mtu(struct hsr_priv *hsr)
110{
111 unsigned int mtu_max;
112 struct hsr_port *port;
113
114 mtu_max = ETH_DATA_LEN;
115 hsr_for_each_port(hsr, port)
116 if (port->type != HSR_PT_MASTER)
117 mtu_max = min(port->dev->mtu, mtu_max);
118
119 if (mtu_max < HSR_HLEN)
120 return 0;
121 return mtu_max - HSR_HLEN;
122}
123
124static int hsr_dev_change_mtu(struct net_device *dev, int new_mtu)
125{
126 struct hsr_priv *hsr;
127
128 hsr = netdev_priv(dev);
129
130 if (new_mtu > hsr_get_max_mtu(hsr)) {
131 netdev_info(dev, "A HSR master's MTU cannot be greater than the smallest MTU of its slaves minus the HSR Tag length (%d octets).\n",
132 HSR_HLEN);
133 return -EINVAL;
134 }
135
136 dev->mtu = new_mtu;
137
138 return 0;
139}
140
141static int hsr_dev_open(struct net_device *dev)
142{
143 struct hsr_priv *hsr;
144 struct hsr_port *port;
145 char designation;
146
147 hsr = netdev_priv(dev);
148 designation = '\0';
149
150 hsr_for_each_port(hsr, port) {
151 if (port->type == HSR_PT_MASTER)
152 continue;
153 switch (port->type) {
154 case HSR_PT_SLAVE_A:
155 designation = 'A';
156 break;
157 case HSR_PT_SLAVE_B:
158 designation = 'B';
159 break;
160 default:
161 designation = '?';
162 }
163 if (!is_slave_up(port->dev))
164 netdev_warn(dev, "Slave %c (%s) is not up; please bring it up to get a fully working HSR network\n",
165 designation, port->dev->name);
166 }
167
168 if (designation == '\0')
169 netdev_warn(dev, "No slave devices configured\n");
170
171 return 0;
172}
173
174static int hsr_dev_close(struct net_device *dev)
175{
176 /* Nothing to do here. */
177 return 0;
178}
179
180static netdev_features_t hsr_features_recompute(struct hsr_priv *hsr,
181 netdev_features_t features)
182{
183 netdev_features_t mask;
184 struct hsr_port *port;
185
186 mask = features;
187
188 /* Mask out all features that, if supported by one device, should be
189 * enabled for all devices (see NETIF_F_ONE_FOR_ALL).
190 *
191 * Anything that's off in mask will not be enabled - so only things
192 * that were in features originally, and also is in NETIF_F_ONE_FOR_ALL,
193 * may become enabled.
194 */
195 features &= ~NETIF_F_ONE_FOR_ALL;
196 hsr_for_each_port(hsr, port)
197 features = netdev_increment_features(features,
198 port->dev->features,
199 mask);
200
201 return features;
202}
203
204static netdev_features_t hsr_fix_features(struct net_device *dev,
205 netdev_features_t features)
206{
207 struct hsr_priv *hsr = netdev_priv(dev);
208
209 return hsr_features_recompute(hsr, features);
210}
211
212static netdev_tx_t hsr_dev_xmit(struct sk_buff *skb, struct net_device *dev)
213{
214 struct hsr_priv *hsr = netdev_priv(dev);
215 struct hsr_port *master;
216
217 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
218 if (master) {
219 skb->dev = master->dev;
220 skb_reset_mac_header(skb);
221 skb_reset_mac_len(skb);
222 spin_lock_bh(&hsr->seqnr_lock);
223 hsr_forward_skb(skb, master);
224 spin_unlock_bh(&hsr->seqnr_lock);
225 } else {
226 dev_core_stats_tx_dropped_inc(dev);
227 dev_kfree_skb_any(skb);
228 }
229 return NETDEV_TX_OK;
230}
231
232static const struct header_ops hsr_header_ops = {
233 .create = eth_header,
234 .parse = eth_header_parse,
235};
236
237static struct sk_buff *hsr_init_skb(struct hsr_port *master)
238{
239 struct hsr_priv *hsr = master->hsr;
240 struct sk_buff *skb;
241 int hlen, tlen;
242
243 hlen = LL_RESERVED_SPACE(master->dev);
244 tlen = master->dev->needed_tailroom;
245 /* skb size is same for PRP/HSR frames, only difference
246 * being, for PRP it is a trailer and for HSR it is a
247 * header
248 */
249 skb = dev_alloc_skb(sizeof(struct hsr_sup_tag) +
250 sizeof(struct hsr_sup_payload) + hlen + tlen);
251
252 if (!skb)
253 return skb;
254
255 skb_reserve(skb, hlen);
256 skb->dev = master->dev;
257 skb->priority = TC_PRIO_CONTROL;
258
259 if (dev_hard_header(skb, skb->dev, ETH_P_PRP,
260 hsr->sup_multicast_addr,
261 skb->dev->dev_addr, skb->len) <= 0)
262 goto out;
263
264 skb_reset_mac_header(skb);
265 skb_reset_mac_len(skb);
266 skb_reset_network_header(skb);
267 skb_reset_transport_header(skb);
268
269 return skb;
270out:
271 kfree_skb(skb);
272
273 return NULL;
274}
275
276static void send_hsr_supervision_frame(struct hsr_port *master,
277 unsigned long *interval)
278{
279 struct hsr_priv *hsr = master->hsr;
280 __u8 type = HSR_TLV_LIFE_CHECK;
281 struct hsr_sup_payload *hsr_sp;
282 struct hsr_sup_tag *hsr_stag;
283 struct sk_buff *skb;
284
285 *interval = msecs_to_jiffies(HSR_LIFE_CHECK_INTERVAL);
286 if (hsr->announce_count < 3 && hsr->prot_version == 0) {
287 type = HSR_TLV_ANNOUNCE;
288 *interval = msecs_to_jiffies(HSR_ANNOUNCE_INTERVAL);
289 hsr->announce_count++;
290 }
291
292 skb = hsr_init_skb(master);
293 if (!skb) {
294 WARN_ONCE(1, "HSR: Could not send supervision frame\n");
295 return;
296 }
297
298 hsr_stag = skb_put(skb, sizeof(struct hsr_sup_tag));
299 set_hsr_stag_path(hsr_stag, (hsr->prot_version ? 0x0 : 0xf));
300 set_hsr_stag_HSR_ver(hsr_stag, hsr->prot_version);
301
302 /* From HSRv1 on we have separate supervision sequence numbers. */
303 spin_lock_bh(&hsr->seqnr_lock);
304 if (hsr->prot_version > 0) {
305 hsr_stag->sequence_nr = htons(hsr->sup_sequence_nr);
306 hsr->sup_sequence_nr++;
307 } else {
308 hsr_stag->sequence_nr = htons(hsr->sequence_nr);
309 hsr->sequence_nr++;
310 }
311
312 hsr_stag->tlv.HSR_TLV_type = type;
313 /* TODO: Why 12 in HSRv0? */
314 hsr_stag->tlv.HSR_TLV_length = hsr->prot_version ?
315 sizeof(struct hsr_sup_payload) : 12;
316
317 /* Payload: MacAddressA */
318 hsr_sp = skb_put(skb, sizeof(struct hsr_sup_payload));
319 ether_addr_copy(hsr_sp->macaddress_A, master->dev->dev_addr);
320
321 if (skb_put_padto(skb, ETH_ZLEN)) {
322 spin_unlock_bh(&hsr->seqnr_lock);
323 return;
324 }
325
326 hsr_forward_skb(skb, master);
327 spin_unlock_bh(&hsr->seqnr_lock);
328 return;
329}
330
331static void send_prp_supervision_frame(struct hsr_port *master,
332 unsigned long *interval)
333{
334 struct hsr_priv *hsr = master->hsr;
335 struct hsr_sup_payload *hsr_sp;
336 struct hsr_sup_tag *hsr_stag;
337 struct sk_buff *skb;
338
339 skb = hsr_init_skb(master);
340 if (!skb) {
341 WARN_ONCE(1, "PRP: Could not send supervision frame\n");
342 return;
343 }
344
345 *interval = msecs_to_jiffies(HSR_LIFE_CHECK_INTERVAL);
346 hsr_stag = skb_put(skb, sizeof(struct hsr_sup_tag));
347 set_hsr_stag_path(hsr_stag, (hsr->prot_version ? 0x0 : 0xf));
348 set_hsr_stag_HSR_ver(hsr_stag, (hsr->prot_version ? 1 : 0));
349
350 /* From HSRv1 on we have separate supervision sequence numbers. */
351 spin_lock_bh(&hsr->seqnr_lock);
352 hsr_stag->sequence_nr = htons(hsr->sup_sequence_nr);
353 hsr->sup_sequence_nr++;
354 hsr_stag->tlv.HSR_TLV_type = PRP_TLV_LIFE_CHECK_DD;
355 hsr_stag->tlv.HSR_TLV_length = sizeof(struct hsr_sup_payload);
356
357 /* Payload: MacAddressA */
358 hsr_sp = skb_put(skb, sizeof(struct hsr_sup_payload));
359 ether_addr_copy(hsr_sp->macaddress_A, master->dev->dev_addr);
360
361 if (skb_put_padto(skb, ETH_ZLEN)) {
362 spin_unlock_bh(&hsr->seqnr_lock);
363 return;
364 }
365
366 hsr_forward_skb(skb, master);
367 spin_unlock_bh(&hsr->seqnr_lock);
368}
369
370/* Announce (supervision frame) timer function
371 */
372static void hsr_announce(struct timer_list *t)
373{
374 struct hsr_priv *hsr;
375 struct hsr_port *master;
376 unsigned long interval;
377
378 hsr = from_timer(hsr, t, announce_timer);
379
380 rcu_read_lock();
381 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
382 hsr->proto_ops->send_sv_frame(master, &interval);
383
384 if (is_admin_up(master->dev))
385 mod_timer(&hsr->announce_timer, jiffies + interval);
386
387 rcu_read_unlock();
388}
389
390void hsr_del_ports(struct hsr_priv *hsr)
391{
392 struct hsr_port *port;
393
394 port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_A);
395 if (port)
396 hsr_del_port(port);
397
398 port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_B);
399 if (port)
400 hsr_del_port(port);
401
402 port = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
403 if (port)
404 hsr_del_port(port);
405}
406
407static const struct net_device_ops hsr_device_ops = {
408 .ndo_change_mtu = hsr_dev_change_mtu,
409 .ndo_open = hsr_dev_open,
410 .ndo_stop = hsr_dev_close,
411 .ndo_start_xmit = hsr_dev_xmit,
412 .ndo_fix_features = hsr_fix_features,
413};
414
415static struct device_type hsr_type = {
416 .name = "hsr",
417};
418
419static struct hsr_proto_ops hsr_ops = {
420 .send_sv_frame = send_hsr_supervision_frame,
421 .create_tagged_frame = hsr_create_tagged_frame,
422 .get_untagged_frame = hsr_get_untagged_frame,
423 .drop_frame = hsr_drop_frame,
424 .fill_frame_info = hsr_fill_frame_info,
425 .invalid_dan_ingress_frame = hsr_invalid_dan_ingress_frame,
426};
427
428static struct hsr_proto_ops prp_ops = {
429 .send_sv_frame = send_prp_supervision_frame,
430 .create_tagged_frame = prp_create_tagged_frame,
431 .get_untagged_frame = prp_get_untagged_frame,
432 .drop_frame = prp_drop_frame,
433 .fill_frame_info = prp_fill_frame_info,
434 .handle_san_frame = prp_handle_san_frame,
435 .update_san_info = prp_update_san_info,
436};
437
438void hsr_dev_setup(struct net_device *dev)
439{
440 eth_hw_addr_random(dev);
441
442 ether_setup(dev);
443 dev->min_mtu = 0;
444 dev->header_ops = &hsr_header_ops;
445 dev->netdev_ops = &hsr_device_ops;
446 SET_NETDEV_DEVTYPE(dev, &hsr_type);
447 dev->priv_flags |= IFF_NO_QUEUE | IFF_DISABLE_NETPOLL;
448
449 dev->needs_free_netdev = true;
450
451 dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
452 NETIF_F_GSO_MASK | NETIF_F_HW_CSUM |
453 NETIF_F_HW_VLAN_CTAG_TX;
454
455 dev->features = dev->hw_features;
456
457 /* Prevent recursive tx locking */
458 dev->features |= NETIF_F_LLTX;
459 /* VLAN on top of HSR needs testing and probably some work on
460 * hsr_header_create() etc.
461 */
462 dev->features |= NETIF_F_VLAN_CHALLENGED;
463 /* Not sure about this. Taken from bridge code. netdev_features.h says
464 * it means "Does not change network namespaces".
465 */
466 dev->features |= NETIF_F_NETNS_LOCAL;
467}
468
469/* Return true if dev is a HSR master; return false otherwise.
470 */
471bool is_hsr_master(struct net_device *dev)
472{
473 return (dev->netdev_ops->ndo_start_xmit == hsr_dev_xmit);
474}
475EXPORT_SYMBOL(is_hsr_master);
476
477/* Default multicast address for HSR Supervision frames */
478static const unsigned char def_multicast_addr[ETH_ALEN] __aligned(2) = {
479 0x01, 0x15, 0x4e, 0x00, 0x01, 0x00
480};
481
482int hsr_dev_finalize(struct net_device *hsr_dev, struct net_device *slave[2],
483 unsigned char multicast_spec, u8 protocol_version,
484 struct netlink_ext_ack *extack)
485{
486 bool unregister = false;
487 struct hsr_priv *hsr;
488 int res;
489
490 hsr = netdev_priv(hsr_dev);
491 INIT_LIST_HEAD(&hsr->ports);
492 INIT_LIST_HEAD(&hsr->node_db);
493 spin_lock_init(&hsr->list_lock);
494
495 eth_hw_addr_set(hsr_dev, slave[0]->dev_addr);
496
497 /* initialize protocol specific functions */
498 if (protocol_version == PRP_V1) {
499 /* For PRP, lan_id has most significant 3 bits holding
500 * the net_id of PRP_LAN_ID
501 */
502 hsr->net_id = PRP_LAN_ID << 1;
503 hsr->proto_ops = &prp_ops;
504 } else {
505 hsr->proto_ops = &hsr_ops;
506 }
507
508 /* Make sure we recognize frames from ourselves in hsr_rcv() */
509 res = hsr_create_self_node(hsr, hsr_dev->dev_addr,
510 slave[1]->dev_addr);
511 if (res < 0)
512 return res;
513
514 spin_lock_init(&hsr->seqnr_lock);
515 /* Overflow soon to find bugs easier: */
516 hsr->sequence_nr = HSR_SEQNR_START;
517 hsr->sup_sequence_nr = HSR_SUP_SEQNR_START;
518
519 timer_setup(&hsr->announce_timer, hsr_announce, 0);
520 timer_setup(&hsr->prune_timer, hsr_prune_nodes, 0);
521
522 ether_addr_copy(hsr->sup_multicast_addr, def_multicast_addr);
523 hsr->sup_multicast_addr[ETH_ALEN - 1] = multicast_spec;
524
525 hsr->prot_version = protocol_version;
526
527 /* Make sure the 1st call to netif_carrier_on() gets through */
528 netif_carrier_off(hsr_dev);
529
530 res = hsr_add_port(hsr, hsr_dev, HSR_PT_MASTER, extack);
531 if (res)
532 goto err_add_master;
533
534 res = register_netdevice(hsr_dev);
535 if (res)
536 goto err_unregister;
537
538 unregister = true;
539
540 res = hsr_add_port(hsr, slave[0], HSR_PT_SLAVE_A, extack);
541 if (res)
542 goto err_unregister;
543
544 res = hsr_add_port(hsr, slave[1], HSR_PT_SLAVE_B, extack);
545 if (res)
546 goto err_unregister;
547
548 hsr_debugfs_init(hsr, hsr_dev);
549 mod_timer(&hsr->prune_timer, jiffies + msecs_to_jiffies(PRUNE_PERIOD));
550
551 return 0;
552
553err_unregister:
554 hsr_del_ports(hsr);
555err_add_master:
556 hsr_del_self_node(hsr);
557
558 if (unregister)
559 unregister_netdevice(hsr_dev);
560 return res;
561}
1/* Copyright 2011-2014 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 * 2011-2014 Arvid Brodin, arvid.brodin@alten.se
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/rtnetlink.h>
19#include <linux/pkt_sched.h>
20#include "hsr_device.h"
21#include "hsr_slave.h"
22#include "hsr_framereg.h"
23#include "hsr_main.h"
24#include "hsr_forward.h"
25
26
27static bool is_admin_up(struct net_device *dev)
28{
29 return dev && (dev->flags & IFF_UP);
30}
31
32static bool is_slave_up(struct net_device *dev)
33{
34 return dev && is_admin_up(dev) && netif_oper_up(dev);
35}
36
37static void __hsr_set_operstate(struct net_device *dev, int transition)
38{
39 write_lock_bh(&dev_base_lock);
40 if (dev->operstate != transition) {
41 dev->operstate = transition;
42 write_unlock_bh(&dev_base_lock);
43 netdev_state_change(dev);
44 } else {
45 write_unlock_bh(&dev_base_lock);
46 }
47}
48
49static void hsr_set_operstate(struct hsr_port *master, bool has_carrier)
50{
51 if (!is_admin_up(master->dev)) {
52 __hsr_set_operstate(master->dev, IF_OPER_DOWN);
53 return;
54 }
55
56 if (has_carrier)
57 __hsr_set_operstate(master->dev, IF_OPER_UP);
58 else
59 __hsr_set_operstate(master->dev, IF_OPER_LOWERLAYERDOWN);
60}
61
62static bool hsr_check_carrier(struct hsr_port *master)
63{
64 struct hsr_port *port;
65 bool has_carrier;
66
67 has_carrier = false;
68
69 rcu_read_lock();
70 hsr_for_each_port(master->hsr, port)
71 if ((port->type != HSR_PT_MASTER) && is_slave_up(port->dev)) {
72 has_carrier = true;
73 break;
74 }
75 rcu_read_unlock();
76
77 if (has_carrier)
78 netif_carrier_on(master->dev);
79 else
80 netif_carrier_off(master->dev);
81
82 return has_carrier;
83}
84
85
86static void hsr_check_announce(struct net_device *hsr_dev,
87 unsigned char old_operstate)
88{
89 struct hsr_priv *hsr;
90
91 hsr = netdev_priv(hsr_dev);
92
93 if ((hsr_dev->operstate == IF_OPER_UP)
94 && (old_operstate != IF_OPER_UP)) {
95 /* Went up */
96 hsr->announce_count = 0;
97 hsr->announce_timer.expires = jiffies +
98 msecs_to_jiffies(HSR_ANNOUNCE_INTERVAL);
99 add_timer(&hsr->announce_timer);
100 }
101
102 if ((hsr_dev->operstate != IF_OPER_UP) && (old_operstate == IF_OPER_UP))
103 /* Went down */
104 del_timer(&hsr->announce_timer);
105}
106
107void hsr_check_carrier_and_operstate(struct hsr_priv *hsr)
108{
109 struct hsr_port *master;
110 unsigned char old_operstate;
111 bool has_carrier;
112
113 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
114 /* netif_stacked_transfer_operstate() cannot be used here since
115 * it doesn't set IF_OPER_LOWERLAYERDOWN (?)
116 */
117 old_operstate = master->dev->operstate;
118 has_carrier = hsr_check_carrier(master);
119 hsr_set_operstate(master, has_carrier);
120 hsr_check_announce(master->dev, old_operstate);
121}
122
123int hsr_get_max_mtu(struct hsr_priv *hsr)
124{
125 unsigned int mtu_max;
126 struct hsr_port *port;
127
128 mtu_max = ETH_DATA_LEN;
129 rcu_read_lock();
130 hsr_for_each_port(hsr, port)
131 if (port->type != HSR_PT_MASTER)
132 mtu_max = min(port->dev->mtu, mtu_max);
133 rcu_read_unlock();
134
135 if (mtu_max < HSR_HLEN)
136 return 0;
137 return mtu_max - HSR_HLEN;
138}
139
140
141static int hsr_dev_change_mtu(struct net_device *dev, int new_mtu)
142{
143 struct hsr_priv *hsr;
144 struct hsr_port *master;
145
146 hsr = netdev_priv(dev);
147 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
148
149 if (new_mtu > hsr_get_max_mtu(hsr)) {
150 netdev_info(master->dev, "A HSR master's MTU cannot be greater than the smallest MTU of its slaves minus the HSR Tag length (%d octets).\n",
151 HSR_HLEN);
152 return -EINVAL;
153 }
154
155 dev->mtu = new_mtu;
156
157 return 0;
158}
159
160static int hsr_dev_open(struct net_device *dev)
161{
162 struct hsr_priv *hsr;
163 struct hsr_port *port;
164 char designation;
165
166 hsr = netdev_priv(dev);
167 designation = '\0';
168
169 rcu_read_lock();
170 hsr_for_each_port(hsr, port) {
171 if (port->type == HSR_PT_MASTER)
172 continue;
173 switch (port->type) {
174 case HSR_PT_SLAVE_A:
175 designation = 'A';
176 break;
177 case HSR_PT_SLAVE_B:
178 designation = 'B';
179 break;
180 default:
181 designation = '?';
182 }
183 if (!is_slave_up(port->dev))
184 netdev_warn(dev, "Slave %c (%s) is not up; please bring it up to get a fully working HSR network\n",
185 designation, port->dev->name);
186 }
187 rcu_read_unlock();
188
189 if (designation == '\0')
190 netdev_warn(dev, "No slave devices configured\n");
191
192 return 0;
193}
194
195
196static int hsr_dev_close(struct net_device *dev)
197{
198 /* Nothing to do here. */
199 return 0;
200}
201
202
203static netdev_features_t hsr_features_recompute(struct hsr_priv *hsr,
204 netdev_features_t features)
205{
206 netdev_features_t mask;
207 struct hsr_port *port;
208
209 mask = features;
210
211 /* Mask out all features that, if supported by one device, should be
212 * enabled for all devices (see NETIF_F_ONE_FOR_ALL).
213 *
214 * Anything that's off in mask will not be enabled - so only things
215 * that were in features originally, and also is in NETIF_F_ONE_FOR_ALL,
216 * may become enabled.
217 */
218 features &= ~NETIF_F_ONE_FOR_ALL;
219 hsr_for_each_port(hsr, port)
220 features = netdev_increment_features(features,
221 port->dev->features,
222 mask);
223
224 return features;
225}
226
227static netdev_features_t hsr_fix_features(struct net_device *dev,
228 netdev_features_t features)
229{
230 struct hsr_priv *hsr = netdev_priv(dev);
231
232 return hsr_features_recompute(hsr, features);
233}
234
235
236static int hsr_dev_xmit(struct sk_buff *skb, struct net_device *dev)
237{
238 struct hsr_priv *hsr = netdev_priv(dev);
239 struct hsr_port *master;
240
241 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
242 skb->dev = master->dev;
243 hsr_forward_skb(skb, master);
244
245 return NETDEV_TX_OK;
246}
247
248
249static const struct header_ops hsr_header_ops = {
250 .create = eth_header,
251 .parse = eth_header_parse,
252};
253
254static void send_hsr_supervision_frame(struct hsr_port *master,
255 u8 type, u8 hsrVer)
256{
257 struct sk_buff *skb;
258 int hlen, tlen;
259 struct hsr_tag *hsr_tag;
260 struct hsr_sup_tag *hsr_stag;
261 struct hsr_sup_payload *hsr_sp;
262 unsigned long irqflags;
263
264 hlen = LL_RESERVED_SPACE(master->dev);
265 tlen = master->dev->needed_tailroom;
266 skb = dev_alloc_skb(
267 sizeof(struct hsr_tag) +
268 sizeof(struct hsr_sup_tag) +
269 sizeof(struct hsr_sup_payload) + hlen + tlen);
270
271 if (skb == NULL)
272 return;
273
274 skb_reserve(skb, hlen);
275
276 skb->dev = master->dev;
277 skb->protocol = htons(hsrVer ? ETH_P_HSR : ETH_P_PRP);
278 skb->priority = TC_PRIO_CONTROL;
279
280 if (dev_hard_header(skb, skb->dev, (hsrVer ? ETH_P_HSR : ETH_P_PRP),
281 master->hsr->sup_multicast_addr,
282 skb->dev->dev_addr, skb->len) <= 0)
283 goto out;
284 skb_reset_mac_header(skb);
285
286 if (hsrVer > 0) {
287 hsr_tag = (typeof(hsr_tag)) skb_put(skb, sizeof(struct hsr_tag));
288 hsr_tag->encap_proto = htons(ETH_P_PRP);
289 set_hsr_tag_LSDU_size(hsr_tag, HSR_V1_SUP_LSDUSIZE);
290 }
291
292 hsr_stag = (typeof(hsr_stag)) skb_put(skb, sizeof(struct hsr_sup_tag));
293 set_hsr_stag_path(hsr_stag, (hsrVer ? 0x0 : 0xf));
294 set_hsr_stag_HSR_Ver(hsr_stag, hsrVer);
295
296 /* From HSRv1 on we have separate supervision sequence numbers. */
297 spin_lock_irqsave(&master->hsr->seqnr_lock, irqflags);
298 if (hsrVer > 0) {
299 hsr_stag->sequence_nr = htons(master->hsr->sup_sequence_nr);
300 hsr_tag->sequence_nr = htons(master->hsr->sequence_nr);
301 master->hsr->sup_sequence_nr++;
302 master->hsr->sequence_nr++;
303 } else {
304 hsr_stag->sequence_nr = htons(master->hsr->sequence_nr);
305 master->hsr->sequence_nr++;
306 }
307 spin_unlock_irqrestore(&master->hsr->seqnr_lock, irqflags);
308
309 hsr_stag->HSR_TLV_Type = type;
310 /* TODO: Why 12 in HSRv0? */
311 hsr_stag->HSR_TLV_Length = hsrVer ? sizeof(struct hsr_sup_payload) : 12;
312
313 /* Payload: MacAddressA */
314 hsr_sp = (typeof(hsr_sp)) skb_put(skb, sizeof(struct hsr_sup_payload));
315 ether_addr_copy(hsr_sp->MacAddressA, master->dev->dev_addr);
316
317 skb_put_padto(skb, ETH_ZLEN + HSR_HLEN);
318
319 hsr_forward_skb(skb, master);
320 return;
321
322out:
323 WARN_ONCE(1, "HSR: Could not send supervision frame\n");
324 kfree_skb(skb);
325}
326
327
328/* Announce (supervision frame) timer function
329 */
330static void hsr_announce(unsigned long data)
331{
332 struct hsr_priv *hsr;
333 struct hsr_port *master;
334
335 hsr = (struct hsr_priv *) data;
336
337 rcu_read_lock();
338 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
339
340 if (hsr->announce_count < 3 && hsr->protVersion == 0) {
341 send_hsr_supervision_frame(master, HSR_TLV_ANNOUNCE,
342 hsr->protVersion);
343 hsr->announce_count++;
344
345 hsr->announce_timer.expires = jiffies +
346 msecs_to_jiffies(HSR_ANNOUNCE_INTERVAL);
347 } else {
348 send_hsr_supervision_frame(master, HSR_TLV_LIFE_CHECK,
349 hsr->protVersion);
350
351 hsr->announce_timer.expires = jiffies +
352 msecs_to_jiffies(HSR_LIFE_CHECK_INTERVAL);
353 }
354
355 if (is_admin_up(master->dev))
356 add_timer(&hsr->announce_timer);
357
358 rcu_read_unlock();
359}
360
361
362/* According to comments in the declaration of struct net_device, this function
363 * is "Called from unregister, can be used to call free_netdev". Ok then...
364 */
365static void hsr_dev_destroy(struct net_device *hsr_dev)
366{
367 struct hsr_priv *hsr;
368 struct hsr_port *port;
369
370 hsr = netdev_priv(hsr_dev);
371
372 rtnl_lock();
373 hsr_for_each_port(hsr, port)
374 hsr_del_port(port);
375 rtnl_unlock();
376
377 del_timer_sync(&hsr->prune_timer);
378 del_timer_sync(&hsr->announce_timer);
379
380 synchronize_rcu();
381 free_netdev(hsr_dev);
382}
383
384static const struct net_device_ops hsr_device_ops = {
385 .ndo_change_mtu = hsr_dev_change_mtu,
386 .ndo_open = hsr_dev_open,
387 .ndo_stop = hsr_dev_close,
388 .ndo_start_xmit = hsr_dev_xmit,
389 .ndo_fix_features = hsr_fix_features,
390};
391
392static struct device_type hsr_type = {
393 .name = "hsr",
394};
395
396void hsr_dev_setup(struct net_device *dev)
397{
398 random_ether_addr(dev->dev_addr);
399
400 ether_setup(dev);
401 dev->min_mtu = 0;
402 dev->header_ops = &hsr_header_ops;
403 dev->netdev_ops = &hsr_device_ops;
404 SET_NETDEV_DEVTYPE(dev, &hsr_type);
405 dev->priv_flags |= IFF_NO_QUEUE;
406
407 dev->destructor = hsr_dev_destroy;
408
409 dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
410 NETIF_F_GSO_MASK | NETIF_F_HW_CSUM |
411 NETIF_F_HW_VLAN_CTAG_TX;
412
413 dev->features = dev->hw_features;
414
415 /* Prevent recursive tx locking */
416 dev->features |= NETIF_F_LLTX;
417 /* VLAN on top of HSR needs testing and probably some work on
418 * hsr_header_create() etc.
419 */
420 dev->features |= NETIF_F_VLAN_CHALLENGED;
421 /* Not sure about this. Taken from bridge code. netdev_features.h says
422 * it means "Does not change network namespaces".
423 */
424 dev->features |= NETIF_F_NETNS_LOCAL;
425}
426
427
428/* Return true if dev is a HSR master; return false otherwise.
429 */
430inline bool is_hsr_master(struct net_device *dev)
431{
432 return (dev->netdev_ops->ndo_start_xmit == hsr_dev_xmit);
433}
434
435/* Default multicast address for HSR Supervision frames */
436static const unsigned char def_multicast_addr[ETH_ALEN] __aligned(2) = {
437 0x01, 0x15, 0x4e, 0x00, 0x01, 0x00
438};
439
440int hsr_dev_finalize(struct net_device *hsr_dev, struct net_device *slave[2],
441 unsigned char multicast_spec, u8 protocol_version)
442{
443 struct hsr_priv *hsr;
444 struct hsr_port *port;
445 int res;
446
447 hsr = netdev_priv(hsr_dev);
448 INIT_LIST_HEAD(&hsr->ports);
449 INIT_LIST_HEAD(&hsr->node_db);
450 INIT_LIST_HEAD(&hsr->self_node_db);
451
452 ether_addr_copy(hsr_dev->dev_addr, slave[0]->dev_addr);
453
454 /* Make sure we recognize frames from ourselves in hsr_rcv() */
455 res = hsr_create_self_node(&hsr->self_node_db, hsr_dev->dev_addr,
456 slave[1]->dev_addr);
457 if (res < 0)
458 return res;
459
460 spin_lock_init(&hsr->seqnr_lock);
461 /* Overflow soon to find bugs easier: */
462 hsr->sequence_nr = HSR_SEQNR_START;
463 hsr->sup_sequence_nr = HSR_SUP_SEQNR_START;
464
465 setup_timer(&hsr->announce_timer, hsr_announce, (unsigned long)hsr);
466
467 setup_timer(&hsr->prune_timer, hsr_prune_nodes, (unsigned long)hsr);
468
469 ether_addr_copy(hsr->sup_multicast_addr, def_multicast_addr);
470 hsr->sup_multicast_addr[ETH_ALEN - 1] = multicast_spec;
471
472 hsr->protVersion = protocol_version;
473
474 /* FIXME: should I modify the value of these?
475 *
476 * - hsr_dev->flags - i.e.
477 * IFF_MASTER/SLAVE?
478 * - hsr_dev->priv_flags - i.e.
479 * IFF_EBRIDGE?
480 * IFF_TX_SKB_SHARING?
481 * IFF_HSR_MASTER/SLAVE?
482 */
483
484 /* Make sure the 1st call to netif_carrier_on() gets through */
485 netif_carrier_off(hsr_dev);
486
487 res = hsr_add_port(hsr, hsr_dev, HSR_PT_MASTER);
488 if (res)
489 return res;
490
491 res = register_netdevice(hsr_dev);
492 if (res)
493 goto fail;
494
495 res = hsr_add_port(hsr, slave[0], HSR_PT_SLAVE_A);
496 if (res)
497 goto fail;
498 res = hsr_add_port(hsr, slave[1], HSR_PT_SLAVE_B);
499 if (res)
500 goto fail;
501
502 mod_timer(&hsr->prune_timer, jiffies + msecs_to_jiffies(PRUNE_PERIOD));
503
504 return 0;
505
506fail:
507 hsr_for_each_port(hsr, port)
508 hsr_del_port(port);
509
510 return res;
511}