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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) && (old_operstate != IF_OPER_UP)) {
 94                 /* Went up */
 95                 hsr->announce_count = 0;
 96                 hsr->announce_timer.expires = jiffies +
 97                                 msecs_to_jiffies(HSR_ANNOUNCE_INTERVAL);
 98                 add_timer(&hsr->announce_timer);
 99         }
100 
101         if ((hsr_dev->operstate != IF_OPER_UP) && (old_operstate == IF_OPER_UP))
102                 /* Went down */
103                 del_timer(&hsr->announce_timer);
104 }
105 
106 void hsr_check_carrier_and_operstate(struct hsr_priv *hsr)
107 {
108         struct hsr_port *master;
109         unsigned char old_operstate;
110         bool has_carrier;
111 
112         master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
113         /* netif_stacked_transfer_operstate() cannot be used here since
114          * it doesn't set IF_OPER_LOWERLAYERDOWN (?)
115          */
116         old_operstate = master->dev->operstate;
117         has_carrier = hsr_check_carrier(master);
118         hsr_set_operstate(master, has_carrier);
119         hsr_check_announce(master->dev, old_operstate);
120 }
121 
122 int hsr_get_max_mtu(struct hsr_priv *hsr)
123 {
124         unsigned int mtu_max;
125         struct hsr_port *port;
126 
127         mtu_max = ETH_DATA_LEN;
128         rcu_read_lock();
129         hsr_for_each_port(hsr, port)
130                 if (port->type != HSR_PT_MASTER)
131                         mtu_max = min(port->dev->mtu, mtu_max);
132         rcu_read_unlock();
133 
134         if (mtu_max < HSR_HLEN)
135                 return 0;
136         return mtu_max - HSR_HLEN;
137 }
138 
139 
140 static int hsr_dev_change_mtu(struct net_device *dev, int new_mtu)
141 {
142         struct hsr_priv *hsr;
143         struct hsr_port *master;
144 
145         hsr = netdev_priv(dev);
146         master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
147 
148         if (new_mtu > hsr_get_max_mtu(hsr)) {
149                 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",
150                             HSR_HLEN);
151                 return -EINVAL;
152         }
153 
154         dev->mtu = new_mtu;
155 
156         return 0;
157 }
158 
159 static int hsr_dev_open(struct net_device *dev)
160 {
161         struct hsr_priv *hsr;
162         struct hsr_port *port;
163         char designation;
164 
165         hsr = netdev_priv(dev);
166         designation = '\0';
167 
168         rcu_read_lock();
169         hsr_for_each_port(hsr, port) {
170                 if (port->type == HSR_PT_MASTER)
171                         continue;
172                 switch (port->type) {
173                 case HSR_PT_SLAVE_A:
174                         designation = 'A';
175                         break;
176                 case HSR_PT_SLAVE_B:
177                         designation = 'B';
178                         break;
179                 default:
180                         designation = '?';
181                 }
182                 if (!is_slave_up(port->dev))
183                         netdev_warn(dev, "Slave %c (%s) is not up; please bring it up to get a fully working HSR network\n",
184                                     designation, port->dev->name);
185         }
186         rcu_read_unlock();
187 
188         if (designation == '\0')
189                 netdev_warn(dev, "No slave devices configured\n");
190 
191         return 0;
192 }
193 
194 
195 static int hsr_dev_close(struct net_device *dev)
196 {
197         /* Nothing to do here. */
198         return 0;
199 }
200 
201 
202 static netdev_features_t hsr_features_recompute(struct hsr_priv *hsr,
203                                                 netdev_features_t features)
204 {
205         netdev_features_t mask;
206         struct hsr_port *port;
207 
208         mask = features;
209 
210         /* Mask out all features that, if supported by one device, should be
211          * enabled for all devices (see NETIF_F_ONE_FOR_ALL).
212          *
213          * Anything that's off in mask will not be enabled - so only things
214          * that were in features originally, and also is in NETIF_F_ONE_FOR_ALL,
215          * may become enabled.
216          */
217         features &= ~NETIF_F_ONE_FOR_ALL;
218         hsr_for_each_port(hsr, port)
219                 features = netdev_increment_features(features,
220                                                      port->dev->features,
221                                                      mask);
222 
223         return features;
224 }
225 
226 static netdev_features_t hsr_fix_features(struct net_device *dev,
227                                           netdev_features_t features)
228 {
229         struct hsr_priv *hsr = netdev_priv(dev);
230 
231         return hsr_features_recompute(hsr, features);
232 }
233 
234 
235 static int hsr_dev_xmit(struct sk_buff *skb, struct net_device *dev)
236 {
237         struct hsr_priv *hsr = netdev_priv(dev);
238         struct hsr_port *master;
239 
240         master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
241         skb->dev = master->dev;
242         hsr_forward_skb(skb, master);
243 
244         return NETDEV_TX_OK;
245 }
246 
247 
248 static const struct header_ops hsr_header_ops = {
249         .create  = eth_header,
250         .parse   = eth_header_parse,
251 };
252 
253 
254 /* HSR:2010 supervision frames should be padded so that the whole frame,
255  * including headers and FCS, is 64 bytes (without VLAN).
256  */
257 static int hsr_pad(int size)
258 {
259         const int min_size = ETH_ZLEN - HSR_HLEN - ETH_HLEN;
260 
261         if (size >= min_size)
262                 return size;
263         return min_size;
264 }
265 
266 static void send_hsr_supervision_frame(struct hsr_port *master, u8 type)
267 {
268         struct sk_buff *skb;
269         int hlen, tlen;
270         struct hsr_sup_tag *hsr_stag;
271         struct hsr_sup_payload *hsr_sp;
272         unsigned long irqflags;
273 
274         hlen = LL_RESERVED_SPACE(master->dev);
275         tlen = master->dev->needed_tailroom;
276         skb = alloc_skb(hsr_pad(sizeof(struct hsr_sup_payload)) + hlen + tlen,
277                         GFP_ATOMIC);
278 
279         if (skb == NULL)
280                 return;
281 
282         skb_reserve(skb, hlen);
283 
284         skb->dev = master->dev;
285         skb->protocol = htons(ETH_P_PRP);
286         skb->priority = TC_PRIO_CONTROL;
287 
288         if (dev_hard_header(skb, skb->dev, ETH_P_PRP,
289                             master->hsr->sup_multicast_addr,
290                             skb->dev->dev_addr, skb->len) <= 0)
291                 goto out;
292         skb_reset_mac_header(skb);
293 
294         hsr_stag = (typeof(hsr_stag)) skb_put(skb, sizeof(*hsr_stag));
295 
296         set_hsr_stag_path(hsr_stag, 0xf);
297         set_hsr_stag_HSR_Ver(hsr_stag, 0);
298 
299         spin_lock_irqsave(&master->hsr->seqnr_lock, irqflags);
300         hsr_stag->sequence_nr = htons(master->hsr->sequence_nr);
301         master->hsr->sequence_nr++;
302         spin_unlock_irqrestore(&master->hsr->seqnr_lock, irqflags);
303 
304         hsr_stag->HSR_TLV_Type = type;
305         hsr_stag->HSR_TLV_Length = 12;
306 
307         /* Payload: MacAddressA */
308         hsr_sp = (typeof(hsr_sp)) skb_put(skb, sizeof(*hsr_sp));
309         ether_addr_copy(hsr_sp->MacAddressA, master->dev->dev_addr);
310 
311         hsr_forward_skb(skb, master);
312         return;
313 
314 out:
315         WARN_ON_ONCE("HSR: Could not send supervision frame\n");
316         kfree_skb(skb);
317 }
318 
319 
320 /* Announce (supervision frame) timer function
321  */
322 static void hsr_announce(unsigned long data)
323 {
324         struct hsr_priv *hsr;
325         struct hsr_port *master;
326 
327         hsr = (struct hsr_priv *) data;
328 
329         rcu_read_lock();
330         master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
331 
332         if (hsr->announce_count < 3) {
333                 send_hsr_supervision_frame(master, HSR_TLV_ANNOUNCE);
334                 hsr->announce_count++;
335         } else {
336                 send_hsr_supervision_frame(master, HSR_TLV_LIFE_CHECK);
337         }
338 
339         if (hsr->announce_count < 3)
340                 hsr->announce_timer.expires = jiffies +
341                                 msecs_to_jiffies(HSR_ANNOUNCE_INTERVAL);
342         else
343                 hsr->announce_timer.expires = jiffies +
344                                 msecs_to_jiffies(HSR_LIFE_CHECK_INTERVAL);
345 
346         if (is_admin_up(master->dev))
347                 add_timer(&hsr->announce_timer);
348 
349         rcu_read_unlock();
350 }
351 
352 
353 /* According to comments in the declaration of struct net_device, this function
354  * is "Called from unregister, can be used to call free_netdev". Ok then...
355  */
356 static void hsr_dev_destroy(struct net_device *hsr_dev)
357 {
358         struct hsr_priv *hsr;
359         struct hsr_port *port;
360 
361         hsr = netdev_priv(hsr_dev);
362 
363         rtnl_lock();
364         hsr_for_each_port(hsr, port)
365                 hsr_del_port(port);
366         rtnl_unlock();
367 
368         del_timer_sync(&hsr->prune_timer);
369         del_timer_sync(&hsr->announce_timer);
370 
371         synchronize_rcu();
372         free_netdev(hsr_dev);
373 }
374 
375 static const struct net_device_ops hsr_device_ops = {
376         .ndo_change_mtu = hsr_dev_change_mtu,
377         .ndo_open = hsr_dev_open,
378         .ndo_stop = hsr_dev_close,
379         .ndo_start_xmit = hsr_dev_xmit,
380         .ndo_fix_features = hsr_fix_features,
381 };
382 
383 static struct device_type hsr_type = {
384         .name = "hsr",
385 };
386 
387 void hsr_dev_setup(struct net_device *dev)
388 {
389         random_ether_addr(dev->dev_addr);
390 
391         ether_setup(dev);
392         dev->header_ops = &hsr_header_ops;
393         dev->netdev_ops = &hsr_device_ops;
394         SET_NETDEV_DEVTYPE(dev, &hsr_type);
395         dev->priv_flags |= IFF_NO_QUEUE;
396 
397         dev->destructor = hsr_dev_destroy;
398 
399         dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA |
400                            NETIF_F_GSO_MASK | NETIF_F_HW_CSUM |
401                            NETIF_F_HW_VLAN_CTAG_TX;
402 
403         dev->features = dev->hw_features;
404 
405         /* Prevent recursive tx locking */
406         dev->features |= NETIF_F_LLTX;
407         /* VLAN on top of HSR needs testing and probably some work on
408          * hsr_header_create() etc.
409          */
410         dev->features |= NETIF_F_VLAN_CHALLENGED;
411         /* Not sure about this. Taken from bridge code. netdev_features.h says
412          * it means "Does not change network namespaces".
413          */
414         dev->features |= NETIF_F_NETNS_LOCAL;
415 }
416 
417 
418 /* Return true if dev is a HSR master; return false otherwise.
419  */
420 inline bool is_hsr_master(struct net_device *dev)
421 {
422         return (dev->netdev_ops->ndo_start_xmit == hsr_dev_xmit);
423 }
424 
425 /* Default multicast address for HSR Supervision frames */
426 static const unsigned char def_multicast_addr[ETH_ALEN] __aligned(2) = {
427         0x01, 0x15, 0x4e, 0x00, 0x01, 0x00
428 };
429 
430 int hsr_dev_finalize(struct net_device *hsr_dev, struct net_device *slave[2],
431                      unsigned char multicast_spec)
432 {
433         struct hsr_priv *hsr;
434         struct hsr_port *port;
435         int res;
436 
437         hsr = netdev_priv(hsr_dev);
438         INIT_LIST_HEAD(&hsr->ports);
439         INIT_LIST_HEAD(&hsr->node_db);
440         INIT_LIST_HEAD(&hsr->self_node_db);
441 
442         ether_addr_copy(hsr_dev->dev_addr, slave[0]->dev_addr);
443 
444         /* Make sure we recognize frames from ourselves in hsr_rcv() */
445         res = hsr_create_self_node(&hsr->self_node_db, hsr_dev->dev_addr,
446                                    slave[1]->dev_addr);
447         if (res < 0)
448                 return res;
449 
450         spin_lock_init(&hsr->seqnr_lock);
451         /* Overflow soon to find bugs easier: */
452         hsr->sequence_nr = HSR_SEQNR_START;
453 
454         init_timer(&hsr->announce_timer);
455         hsr->announce_timer.function = hsr_announce;
456         hsr->announce_timer.data = (unsigned long) hsr;
457 
458         init_timer(&hsr->prune_timer);
459         hsr->prune_timer.function = hsr_prune_nodes;
460         hsr->prune_timer.data = (unsigned long) hsr;
461 
462         ether_addr_copy(hsr->sup_multicast_addr, def_multicast_addr);
463         hsr->sup_multicast_addr[ETH_ALEN - 1] = multicast_spec;
464 
465         /* FIXME: should I modify the value of these?
466          *
467          * - hsr_dev->flags - i.e.
468          *                      IFF_MASTER/SLAVE?
469          * - hsr_dev->priv_flags - i.e.
470          *                      IFF_EBRIDGE?
471          *                      IFF_TX_SKB_SHARING?
472          *                      IFF_HSR_MASTER/SLAVE?
473          */
474 
475         /* Make sure the 1st call to netif_carrier_on() gets through */
476         netif_carrier_off(hsr_dev);
477 
478         res = hsr_add_port(hsr, hsr_dev, HSR_PT_MASTER);
479         if (res)
480                 return res;
481 
482         res = register_netdevice(hsr_dev);
483         if (res)
484                 goto fail;
485 
486         res = hsr_add_port(hsr, slave[0], HSR_PT_SLAVE_A);
487         if (res)
488                 goto fail;
489         res = hsr_add_port(hsr, slave[1], HSR_PT_SLAVE_B);
490         if (res)
491                 goto fail;
492 
493         hsr->prune_timer.expires = jiffies + msecs_to_jiffies(PRUNE_PERIOD);
494         add_timer(&hsr->prune_timer);
495 
496         return 0;
497 
498 fail:
499         hsr_for_each_port(hsr, port)
500                 hsr_del_port(port);
501 
502         return res;
503 }
504 

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