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Linux/net/hsr/hsr_device.c

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  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 
 27 static bool is_admin_up(struct net_device *dev)
 28 {
 29         return dev && (dev->flags & IFF_UP);
 30 }
 31 
 32 static bool is_slave_up(struct net_device *dev)
 33 {
 34         return dev && is_admin_up(dev) && netif_oper_up(dev);
 35 }
 36 
 37 static 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 
 49 static 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 
 62 static 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 
 86 static 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 
107 void 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 
123 int 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 
141 static 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 
160 static 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 
196 static int hsr_dev_close(struct net_device *dev)
197 {
198         /* Nothing to do here. */
199         return 0;
200 }
201 
202 
203 static 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 
227 static 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 
236 static 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 
249 static const struct header_ops hsr_header_ops = {
250         .create  = eth_header,
251         .parse   = eth_header_parse,
252 };
253 
254 static 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 = 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 = 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 = skb_put(skb, sizeof(struct hsr_sup_payload));
315         ether_addr_copy(hsr_sp->MacAddressA, master->dev->dev_addr);
316 
317         if (skb_put_padto(skb, ETH_ZLEN + HSR_HLEN))
318                 return;
319 
320         hsr_forward_skb(skb, master);
321         return;
322 
323 out:
324         WARN_ONCE(1, "HSR: Could not send supervision frame\n");
325         kfree_skb(skb);
326 }
327 
328 
329 /* Announce (supervision frame) timer function
330  */
331 static void hsr_announce(unsigned long data)
332 {
333         struct hsr_priv *hsr;
334         struct hsr_port *master;
335 
336         hsr = (struct hsr_priv *) data;
337 
338         rcu_read_lock();
339         master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
340 
341         if (hsr->announce_count < 3 && hsr->protVersion == 0) {
342                 send_hsr_supervision_frame(master, HSR_TLV_ANNOUNCE,
343                                 hsr->protVersion);
344                 hsr->announce_count++;
345 
346                 hsr->announce_timer.expires = jiffies +
347                                 msecs_to_jiffies(HSR_ANNOUNCE_INTERVAL);
348         } else {
349                 send_hsr_supervision_frame(master, HSR_TLV_LIFE_CHECK,
350                                 hsr->protVersion);
351 
352                 hsr->announce_timer.expires = jiffies +
353                                 msecs_to_jiffies(HSR_LIFE_CHECK_INTERVAL);
354         }
355 
356         if (is_admin_up(master->dev))
357                 add_timer(&hsr->announce_timer);
358 
359         rcu_read_unlock();
360 }
361 
362 
363 /* According to comments in the declaration of struct net_device, this function
364  * is "Called from unregister, can be used to call free_netdev". Ok then...
365  */
366 static void hsr_dev_destroy(struct net_device *hsr_dev)
367 {
368         struct hsr_priv *hsr;
369         struct hsr_port *port;
370 
371         hsr = netdev_priv(hsr_dev);
372 
373         rtnl_lock();
374         hsr_for_each_port(hsr, port)
375                 hsr_del_port(port);
376         rtnl_unlock();
377 
378         del_timer_sync(&hsr->prune_timer);
379         del_timer_sync(&hsr->announce_timer);
380 
381         synchronize_rcu();
382 }
383 
384 static 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 
392 static struct device_type hsr_type = {
393         .name = "hsr",
394 };
395 
396 void hsr_dev_setup(struct net_device *dev)
397 {
398         eth_hw_addr_random(dev);
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->needs_free_netdev = true;
408         dev->priv_destructor = hsr_dev_destroy;
409 
410         dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
411                            NETIF_F_GSO_MASK | NETIF_F_HW_CSUM |
412                            NETIF_F_HW_VLAN_CTAG_TX;
413 
414         dev->features = dev->hw_features;
415 
416         /* Prevent recursive tx locking */
417         dev->features |= NETIF_F_LLTX;
418         /* VLAN on top of HSR needs testing and probably some work on
419          * hsr_header_create() etc.
420          */
421         dev->features |= NETIF_F_VLAN_CHALLENGED;
422         /* Not sure about this. Taken from bridge code. netdev_features.h says
423          * it means "Does not change network namespaces".
424          */
425         dev->features |= NETIF_F_NETNS_LOCAL;
426 }
427 
428 
429 /* Return true if dev is a HSR master; return false otherwise.
430  */
431 inline bool is_hsr_master(struct net_device *dev)
432 {
433         return (dev->netdev_ops->ndo_start_xmit == hsr_dev_xmit);
434 }
435 
436 /* Default multicast address for HSR Supervision frames */
437 static const unsigned char def_multicast_addr[ETH_ALEN] __aligned(2) = {
438         0x01, 0x15, 0x4e, 0x00, 0x01, 0x00
439 };
440 
441 int hsr_dev_finalize(struct net_device *hsr_dev, struct net_device *slave[2],
442                      unsigned char multicast_spec, u8 protocol_version)
443 {
444         struct hsr_priv *hsr;
445         struct hsr_port *port;
446         int res;
447 
448         hsr = netdev_priv(hsr_dev);
449         INIT_LIST_HEAD(&hsr->ports);
450         INIT_LIST_HEAD(&hsr->node_db);
451         INIT_LIST_HEAD(&hsr->self_node_db);
452 
453         ether_addr_copy(hsr_dev->dev_addr, slave[0]->dev_addr);
454 
455         /* Make sure we recognize frames from ourselves in hsr_rcv() */
456         res = hsr_create_self_node(&hsr->self_node_db, hsr_dev->dev_addr,
457                                    slave[1]->dev_addr);
458         if (res < 0)
459                 return res;
460 
461         spin_lock_init(&hsr->seqnr_lock);
462         /* Overflow soon to find bugs easier: */
463         hsr->sequence_nr = HSR_SEQNR_START;
464         hsr->sup_sequence_nr = HSR_SUP_SEQNR_START;
465 
466         setup_timer(&hsr->announce_timer, hsr_announce, (unsigned long)hsr);
467 
468         setup_timer(&hsr->prune_timer, hsr_prune_nodes, (unsigned long)hsr);
469 
470         ether_addr_copy(hsr->sup_multicast_addr, def_multicast_addr);
471         hsr->sup_multicast_addr[ETH_ALEN - 1] = multicast_spec;
472 
473         hsr->protVersion = protocol_version;
474 
475         /* FIXME: should I modify the value of these?
476          *
477          * - hsr_dev->flags - i.e.
478          *                      IFF_MASTER/SLAVE?
479          * - hsr_dev->priv_flags - i.e.
480          *                      IFF_EBRIDGE?
481          *                      IFF_TX_SKB_SHARING?
482          *                      IFF_HSR_MASTER/SLAVE?
483          */
484 
485         /* Make sure the 1st call to netif_carrier_on() gets through */
486         netif_carrier_off(hsr_dev);
487 
488         res = hsr_add_port(hsr, hsr_dev, HSR_PT_MASTER);
489         if (res)
490                 return res;
491 
492         res = register_netdevice(hsr_dev);
493         if (res)
494                 goto fail;
495 
496         res = hsr_add_port(hsr, slave[0], HSR_PT_SLAVE_A);
497         if (res)
498                 goto fail;
499         res = hsr_add_port(hsr, slave[1], HSR_PT_SLAVE_B);
500         if (res)
501                 goto fail;
502 
503         mod_timer(&hsr->prune_timer, jiffies + msecs_to_jiffies(PRUNE_PERIOD));
504 
505         return 0;
506 
507 fail:
508         hsr_for_each_port(hsr, port)
509                 hsr_del_port(port);
510 
511         return res;
512 }
513 

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