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Linux/net/dsa/dsa.c

  1 /*
  2  * net/dsa/dsa.c - Hardware switch handling
  3  * Copyright (c) 2008-2009 Marvell Semiconductor
  4  * Copyright (c) 2013 Florian Fainelli <florian@openwrt.org>
  5  *
  6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License as published by
  8  * the Free Software Foundation; either version 2 of the License, or
  9  * (at your option) any later version.
 10  */
 11 
 12 #include <linux/list.h>
 13 #include <linux/netdevice.h>
 14 #include <linux/platform_device.h>
 15 #include <linux/slab.h>
 16 #include <linux/module.h>
 17 #include <net/dsa.h>
 18 #include <linux/of.h>
 19 #include <linux/of_mdio.h>
 20 #include <linux/of_platform.h>
 21 #include "dsa_priv.h"
 22 
 23 char dsa_driver_version[] = "0.1";
 24 
 25 
 26 /* switch driver registration ***********************************************/
 27 static DEFINE_MUTEX(dsa_switch_drivers_mutex);
 28 static LIST_HEAD(dsa_switch_drivers);
 29 
 30 void register_switch_driver(struct dsa_switch_driver *drv)
 31 {
 32         mutex_lock(&dsa_switch_drivers_mutex);
 33         list_add_tail(&drv->list, &dsa_switch_drivers);
 34         mutex_unlock(&dsa_switch_drivers_mutex);
 35 }
 36 EXPORT_SYMBOL_GPL(register_switch_driver);
 37 
 38 void unregister_switch_driver(struct dsa_switch_driver *drv)
 39 {
 40         mutex_lock(&dsa_switch_drivers_mutex);
 41         list_del_init(&drv->list);
 42         mutex_unlock(&dsa_switch_drivers_mutex);
 43 }
 44 EXPORT_SYMBOL_GPL(unregister_switch_driver);
 45 
 46 static struct dsa_switch_driver *
 47 dsa_switch_probe(struct mii_bus *bus, int sw_addr, char **_name)
 48 {
 49         struct dsa_switch_driver *ret;
 50         struct list_head *list;
 51         char *name;
 52 
 53         ret = NULL;
 54         name = NULL;
 55 
 56         mutex_lock(&dsa_switch_drivers_mutex);
 57         list_for_each(list, &dsa_switch_drivers) {
 58                 struct dsa_switch_driver *drv;
 59 
 60                 drv = list_entry(list, struct dsa_switch_driver, list);
 61 
 62                 name = drv->probe(bus, sw_addr);
 63                 if (name != NULL) {
 64                         ret = drv;
 65                         break;
 66                 }
 67         }
 68         mutex_unlock(&dsa_switch_drivers_mutex);
 69 
 70         *_name = name;
 71 
 72         return ret;
 73 }
 74 
 75 
 76 /* basic switch operations **************************************************/
 77 static struct dsa_switch *
 78 dsa_switch_setup(struct dsa_switch_tree *dst, int index,
 79                  struct device *parent, struct mii_bus *bus)
 80 {
 81         struct dsa_chip_data *pd = dst->pd->chip + index;
 82         struct dsa_switch_driver *drv;
 83         struct dsa_switch *ds;
 84         int ret;
 85         char *name;
 86         int i;
 87         bool valid_name_found = false;
 88 
 89         /*
 90          * Probe for switch model.
 91          */
 92         drv = dsa_switch_probe(bus, pd->sw_addr, &name);
 93         if (drv == NULL) {
 94                 printk(KERN_ERR "%s[%d]: could not detect attached switch\n",
 95                        dst->master_netdev->name, index);
 96                 return ERR_PTR(-EINVAL);
 97         }
 98         printk(KERN_INFO "%s[%d]: detected a %s switch\n",
 99                 dst->master_netdev->name, index, name);
100 
101 
102         /*
103          * Allocate and initialise switch state.
104          */
105         ds = kzalloc(sizeof(*ds) + drv->priv_size, GFP_KERNEL);
106         if (ds == NULL)
107                 return ERR_PTR(-ENOMEM);
108 
109         ds->dst = dst;
110         ds->index = index;
111         ds->pd = dst->pd->chip + index;
112         ds->drv = drv;
113         ds->master_mii_bus = bus;
114 
115 
116         /*
117          * Validate supplied switch configuration.
118          */
119         for (i = 0; i < DSA_MAX_PORTS; i++) {
120                 char *name;
121 
122                 name = pd->port_names[i];
123                 if (name == NULL)
124                         continue;
125 
126                 if (!strcmp(name, "cpu")) {
127                         if (dst->cpu_switch != -1) {
128                                 printk(KERN_ERR "multiple cpu ports?!\n");
129                                 ret = -EINVAL;
130                                 goto out;
131                         }
132                         dst->cpu_switch = index;
133                         dst->cpu_port = i;
134                 } else if (!strcmp(name, "dsa")) {
135                         ds->dsa_port_mask |= 1 << i;
136                 } else {
137                         ds->phys_port_mask |= 1 << i;
138                 }
139                 valid_name_found = true;
140         }
141 
142         if (!valid_name_found && i == DSA_MAX_PORTS) {
143                 ret = -EINVAL;
144                 goto out;
145         }
146 
147         /*
148          * If the CPU connects to this switch, set the switch tree
149          * tagging protocol to the preferred tagging format of this
150          * switch.
151          */
152         if (ds->dst->cpu_switch == index)
153                 ds->dst->tag_protocol = drv->tag_protocol;
154 
155 
156         /*
157          * Do basic register setup.
158          */
159         ret = drv->setup(ds);
160         if (ret < 0)
161                 goto out;
162 
163         ret = drv->set_addr(ds, dst->master_netdev->dev_addr);
164         if (ret < 0)
165                 goto out;
166 
167         ds->slave_mii_bus = mdiobus_alloc();
168         if (ds->slave_mii_bus == NULL) {
169                 ret = -ENOMEM;
170                 goto out;
171         }
172         dsa_slave_mii_bus_init(ds);
173 
174         ret = mdiobus_register(ds->slave_mii_bus);
175         if (ret < 0)
176                 goto out_free;
177 
178 
179         /*
180          * Create network devices for physical switch ports.
181          */
182         for (i = 0; i < DSA_MAX_PORTS; i++) {
183                 struct net_device *slave_dev;
184 
185                 if (!(ds->phys_port_mask & (1 << i)))
186                         continue;
187 
188                 slave_dev = dsa_slave_create(ds, parent, i, pd->port_names[i]);
189                 if (slave_dev == NULL) {
190                         printk(KERN_ERR "%s[%d]: can't create dsa "
191                                "slave device for port %d(%s)\n",
192                                dst->master_netdev->name,
193                                index, i, pd->port_names[i]);
194                         continue;
195                 }
196 
197                 ds->ports[i] = slave_dev;
198         }
199 
200         return ds;
201 
202 out_free:
203         mdiobus_free(ds->slave_mii_bus);
204 out:
205         kfree(ds);
206         return ERR_PTR(ret);
207 }
208 
209 static void dsa_switch_destroy(struct dsa_switch *ds)
210 {
211 }
212 
213 
214 /* link polling *************************************************************/
215 static void dsa_link_poll_work(struct work_struct *ugly)
216 {
217         struct dsa_switch_tree *dst;
218         int i;
219 
220         dst = container_of(ugly, struct dsa_switch_tree, link_poll_work);
221 
222         for (i = 0; i < dst->pd->nr_chips; i++) {
223                 struct dsa_switch *ds = dst->ds[i];
224 
225                 if (ds != NULL && ds->drv->poll_link != NULL)
226                         ds->drv->poll_link(ds);
227         }
228 
229         mod_timer(&dst->link_poll_timer, round_jiffies(jiffies + HZ));
230 }
231 
232 static void dsa_link_poll_timer(unsigned long _dst)
233 {
234         struct dsa_switch_tree *dst = (void *)_dst;
235 
236         schedule_work(&dst->link_poll_work);
237 }
238 
239 
240 /* platform driver init and cleanup *****************************************/
241 static int dev_is_class(struct device *dev, void *class)
242 {
243         if (dev->class != NULL && !strcmp(dev->class->name, class))
244                 return 1;
245 
246         return 0;
247 }
248 
249 static struct device *dev_find_class(struct device *parent, char *class)
250 {
251         if (dev_is_class(parent, class)) {
252                 get_device(parent);
253                 return parent;
254         }
255 
256         return device_find_child(parent, class, dev_is_class);
257 }
258 
259 static struct mii_bus *dev_to_mii_bus(struct device *dev)
260 {
261         struct device *d;
262 
263         d = dev_find_class(dev, "mdio_bus");
264         if (d != NULL) {
265                 struct mii_bus *bus;
266 
267                 bus = to_mii_bus(d);
268                 put_device(d);
269 
270                 return bus;
271         }
272 
273         return NULL;
274 }
275 
276 static struct net_device *dev_to_net_device(struct device *dev)
277 {
278         struct device *d;
279 
280         d = dev_find_class(dev, "net");
281         if (d != NULL) {
282                 struct net_device *nd;
283 
284                 nd = to_net_dev(d);
285                 dev_hold(nd);
286                 put_device(d);
287 
288                 return nd;
289         }
290 
291         return NULL;
292 }
293 
294 #ifdef CONFIG_OF
295 static int dsa_of_setup_routing_table(struct dsa_platform_data *pd,
296                                         struct dsa_chip_data *cd,
297                                         int chip_index,
298                                         struct device_node *link)
299 {
300         int ret;
301         const __be32 *reg;
302         int link_port_addr;
303         int link_sw_addr;
304         struct device_node *parent_sw;
305         int len;
306 
307         parent_sw = of_get_parent(link);
308         if (!parent_sw)
309                 return -EINVAL;
310 
311         reg = of_get_property(parent_sw, "reg", &len);
312         if (!reg || (len != sizeof(*reg) * 2))
313                 return -EINVAL;
314 
315         link_sw_addr = be32_to_cpup(reg + 1);
316 
317         if (link_sw_addr >= pd->nr_chips)
318                 return -EINVAL;
319 
320         /* First time routing table allocation */
321         if (!cd->rtable) {
322                 cd->rtable = kmalloc(pd->nr_chips * sizeof(s8), GFP_KERNEL);
323                 if (!cd->rtable)
324                         return -ENOMEM;
325 
326                 /* default to no valid uplink/downlink */
327                 memset(cd->rtable, -1, pd->nr_chips * sizeof(s8));
328         }
329 
330         reg = of_get_property(link, "reg", NULL);
331         if (!reg) {
332                 ret = -EINVAL;
333                 goto out;
334         }
335 
336         link_port_addr = be32_to_cpup(reg);
337 
338         cd->rtable[link_sw_addr] = link_port_addr;
339 
340         return 0;
341 out:
342         kfree(cd->rtable);
343         return ret;
344 }
345 
346 static void dsa_of_free_platform_data(struct dsa_platform_data *pd)
347 {
348         int i;
349         int port_index;
350 
351         for (i = 0; i < pd->nr_chips; i++) {
352                 port_index = 0;
353                 while (port_index < DSA_MAX_PORTS) {
354                         kfree(pd->chip[i].port_names[port_index]);
355                         port_index++;
356                 }
357                 kfree(pd->chip[i].rtable);
358         }
359         kfree(pd->chip);
360 }
361 
362 static int dsa_of_probe(struct platform_device *pdev)
363 {
364         struct device_node *np = pdev->dev.of_node;
365         struct device_node *child, *mdio, *ethernet, *port, *link;
366         struct mii_bus *mdio_bus;
367         struct platform_device *ethernet_dev;
368         struct dsa_platform_data *pd;
369         struct dsa_chip_data *cd;
370         const char *port_name;
371         int chip_index, port_index;
372         const unsigned int *sw_addr, *port_reg;
373         int ret;
374 
375         mdio = of_parse_phandle(np, "dsa,mii-bus", 0);
376         if (!mdio)
377                 return -EINVAL;
378 
379         mdio_bus = of_mdio_find_bus(mdio);
380         if (!mdio_bus)
381                 return -EINVAL;
382 
383         ethernet = of_parse_phandle(np, "dsa,ethernet", 0);
384         if (!ethernet)
385                 return -EINVAL;
386 
387         ethernet_dev = of_find_device_by_node(ethernet);
388         if (!ethernet_dev)
389                 return -ENODEV;
390 
391         pd = kzalloc(sizeof(*pd), GFP_KERNEL);
392         if (!pd)
393                 return -ENOMEM;
394 
395         pdev->dev.platform_data = pd;
396         pd->netdev = &ethernet_dev->dev;
397         pd->nr_chips = of_get_child_count(np);
398         if (pd->nr_chips > DSA_MAX_SWITCHES)
399                 pd->nr_chips = DSA_MAX_SWITCHES;
400 
401         pd->chip = kzalloc(pd->nr_chips * sizeof(struct dsa_chip_data),
402                         GFP_KERNEL);
403         if (!pd->chip) {
404                 ret = -ENOMEM;
405                 goto out_free;
406         }
407 
408         chip_index = -1;
409         for_each_available_child_of_node(np, child) {
410                 chip_index++;
411                 cd = &pd->chip[chip_index];
412 
413                 cd->mii_bus = &mdio_bus->dev;
414 
415                 sw_addr = of_get_property(child, "reg", NULL);
416                 if (!sw_addr)
417                         continue;
418 
419                 cd->sw_addr = be32_to_cpup(sw_addr);
420                 if (cd->sw_addr > PHY_MAX_ADDR)
421                         continue;
422 
423                 for_each_available_child_of_node(child, port) {
424                         port_reg = of_get_property(port, "reg", NULL);
425                         if (!port_reg)
426                                 continue;
427 
428                         port_index = be32_to_cpup(port_reg);
429 
430                         port_name = of_get_property(port, "label", NULL);
431                         if (!port_name)
432                                 continue;
433 
434                         cd->port_names[port_index] = kstrdup(port_name,
435                                         GFP_KERNEL);
436                         if (!cd->port_names[port_index]) {
437                                 ret = -ENOMEM;
438                                 goto out_free_chip;
439                         }
440 
441                         link = of_parse_phandle(port, "link", 0);
442 
443                         if (!strcmp(port_name, "dsa") && link &&
444                                         pd->nr_chips > 1) {
445                                 ret = dsa_of_setup_routing_table(pd, cd,
446                                                 chip_index, link);
447                                 if (ret)
448                                         goto out_free_chip;
449                         }
450 
451                         if (port_index == DSA_MAX_PORTS)
452                                 break;
453                 }
454         }
455 
456         return 0;
457 
458 out_free_chip:
459         dsa_of_free_platform_data(pd);
460 out_free:
461         kfree(pd);
462         pdev->dev.platform_data = NULL;
463         return ret;
464 }
465 
466 static void dsa_of_remove(struct platform_device *pdev)
467 {
468         struct dsa_platform_data *pd = pdev->dev.platform_data;
469 
470         if (!pdev->dev.of_node)
471                 return;
472 
473         dsa_of_free_platform_data(pd);
474         kfree(pd);
475 }
476 #else
477 static inline int dsa_of_probe(struct platform_device *pdev)
478 {
479         return 0;
480 }
481 
482 static inline void dsa_of_remove(struct platform_device *pdev)
483 {
484 }
485 #endif
486 
487 static int dsa_probe(struct platform_device *pdev)
488 {
489         static int dsa_version_printed;
490         struct dsa_platform_data *pd = pdev->dev.platform_data;
491         struct net_device *dev;
492         struct dsa_switch_tree *dst;
493         int i, ret;
494 
495         if (!dsa_version_printed++)
496                 printk(KERN_NOTICE "Distributed Switch Architecture "
497                         "driver version %s\n", dsa_driver_version);
498 
499         if (pdev->dev.of_node) {
500                 ret = dsa_of_probe(pdev);
501                 if (ret)
502                         return ret;
503 
504                 pd = pdev->dev.platform_data;
505         }
506 
507         if (pd == NULL || pd->netdev == NULL)
508                 return -EINVAL;
509 
510         dev = dev_to_net_device(pd->netdev);
511         if (dev == NULL) {
512                 ret = -EINVAL;
513                 goto out;
514         }
515 
516         if (dev->dsa_ptr != NULL) {
517                 dev_put(dev);
518                 ret = -EEXIST;
519                 goto out;
520         }
521 
522         dst = kzalloc(sizeof(*dst), GFP_KERNEL);
523         if (dst == NULL) {
524                 dev_put(dev);
525                 ret = -ENOMEM;
526                 goto out;
527         }
528 
529         platform_set_drvdata(pdev, dst);
530 
531         dst->pd = pd;
532         dst->master_netdev = dev;
533         dst->cpu_switch = -1;
534         dst->cpu_port = -1;
535 
536         for (i = 0; i < pd->nr_chips; i++) {
537                 struct mii_bus *bus;
538                 struct dsa_switch *ds;
539 
540                 bus = dev_to_mii_bus(pd->chip[i].mii_bus);
541                 if (bus == NULL) {
542                         printk(KERN_ERR "%s[%d]: no mii bus found for "
543                                 "dsa switch\n", dev->name, i);
544                         continue;
545                 }
546 
547                 ds = dsa_switch_setup(dst, i, &pdev->dev, bus);
548                 if (IS_ERR(ds)) {
549                         printk(KERN_ERR "%s[%d]: couldn't create dsa switch "
550                                 "instance (error %ld)\n", dev->name, i,
551                                 PTR_ERR(ds));
552                         continue;
553                 }
554 
555                 dst->ds[i] = ds;
556                 if (ds->drv->poll_link != NULL)
557                         dst->link_poll_needed = 1;
558         }
559 
560         /*
561          * If we use a tagging format that doesn't have an ethertype
562          * field, make sure that all packets from this point on get
563          * sent to the tag format's receive function.
564          */
565         wmb();
566         dev->dsa_ptr = (void *)dst;
567 
568         if (dst->link_poll_needed) {
569                 INIT_WORK(&dst->link_poll_work, dsa_link_poll_work);
570                 init_timer(&dst->link_poll_timer);
571                 dst->link_poll_timer.data = (unsigned long)dst;
572                 dst->link_poll_timer.function = dsa_link_poll_timer;
573                 dst->link_poll_timer.expires = round_jiffies(jiffies + HZ);
574                 add_timer(&dst->link_poll_timer);
575         }
576 
577         return 0;
578 
579 out:
580         dsa_of_remove(pdev);
581 
582         return ret;
583 }
584 
585 static int dsa_remove(struct platform_device *pdev)
586 {
587         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
588         int i;
589 
590         if (dst->link_poll_needed)
591                 del_timer_sync(&dst->link_poll_timer);
592 
593         flush_work(&dst->link_poll_work);
594 
595         for (i = 0; i < dst->pd->nr_chips; i++) {
596                 struct dsa_switch *ds = dst->ds[i];
597 
598                 if (ds != NULL)
599                         dsa_switch_destroy(ds);
600         }
601 
602         dsa_of_remove(pdev);
603 
604         return 0;
605 }
606 
607 static void dsa_shutdown(struct platform_device *pdev)
608 {
609 }
610 
611 static const struct of_device_id dsa_of_match_table[] = {
612         { .compatible = "marvell,dsa", },
613         {}
614 };
615 MODULE_DEVICE_TABLE(of, dsa_of_match_table);
616 
617 static struct platform_driver dsa_driver = {
618         .probe          = dsa_probe,
619         .remove         = dsa_remove,
620         .shutdown       = dsa_shutdown,
621         .driver = {
622                 .name   = "dsa",
623                 .owner  = THIS_MODULE,
624                 .of_match_table = dsa_of_match_table,
625         },
626 };
627 
628 static int __init dsa_init_module(void)
629 {
630         int rc;
631 
632         rc = platform_driver_register(&dsa_driver);
633         if (rc)
634                 return rc;
635 
636 #ifdef CONFIG_NET_DSA_TAG_DSA
637         dev_add_pack(&dsa_packet_type);
638 #endif
639 #ifdef CONFIG_NET_DSA_TAG_EDSA
640         dev_add_pack(&edsa_packet_type);
641 #endif
642 #ifdef CONFIG_NET_DSA_TAG_TRAILER
643         dev_add_pack(&trailer_packet_type);
644 #endif
645         return 0;
646 }
647 module_init(dsa_init_module);
648 
649 static void __exit dsa_cleanup_module(void)
650 {
651 #ifdef CONFIG_NET_DSA_TAG_TRAILER
652         dev_remove_pack(&trailer_packet_type);
653 #endif
654 #ifdef CONFIG_NET_DSA_TAG_EDSA
655         dev_remove_pack(&edsa_packet_type);
656 #endif
657 #ifdef CONFIG_NET_DSA_TAG_DSA
658         dev_remove_pack(&dsa_packet_type);
659 #endif
660         platform_driver_unregister(&dsa_driver);
661 }
662 module_exit(dsa_cleanup_module);
663 
664 MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
665 MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
666 MODULE_LICENSE("GPL");
667 MODULE_ALIAS("platform:dsa");
668 

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