~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/net/dsa/dsa.c

Version: ~ [ linux-5.4.2 ] ~ [ linux-5.3.15 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.88 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.158 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.206 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.206 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.78 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  * net/dsa/dsa.c - Hardware switch handling
  3  * Copyright (c) 2008-2009 Marvell Semiconductor
  4  *
  5  * This program is free software; you can redistribute it and/or modify
  6  * it under the terms of the GNU General Public License as published by
  7  * the Free Software Foundation; either version 2 of the License, or
  8  * (at your option) any later version.
  9  */
 10 
 11 #include <linux/list.h>
 12 #include <linux/netdevice.h>
 13 #include <linux/platform_device.h>
 14 #include <linux/slab.h>
 15 #include <linux/module.h>
 16 #include <net/dsa.h>
 17 #include "dsa_priv.h"
 18 
 19 char dsa_driver_version[] = "0.1";
 20 
 21 
 22 /* switch driver registration ***********************************************/
 23 static DEFINE_MUTEX(dsa_switch_drivers_mutex);
 24 static LIST_HEAD(dsa_switch_drivers);
 25 
 26 void register_switch_driver(struct dsa_switch_driver *drv)
 27 {
 28         mutex_lock(&dsa_switch_drivers_mutex);
 29         list_add_tail(&drv->list, &dsa_switch_drivers);
 30         mutex_unlock(&dsa_switch_drivers_mutex);
 31 }
 32 EXPORT_SYMBOL_GPL(register_switch_driver);
 33 
 34 void unregister_switch_driver(struct dsa_switch_driver *drv)
 35 {
 36         mutex_lock(&dsa_switch_drivers_mutex);
 37         list_del_init(&drv->list);
 38         mutex_unlock(&dsa_switch_drivers_mutex);
 39 }
 40 EXPORT_SYMBOL_GPL(unregister_switch_driver);
 41 
 42 static struct dsa_switch_driver *
 43 dsa_switch_probe(struct mii_bus *bus, int sw_addr, char **_name)
 44 {
 45         struct dsa_switch_driver *ret;
 46         struct list_head *list;
 47         char *name;
 48 
 49         ret = NULL;
 50         name = NULL;
 51 
 52         mutex_lock(&dsa_switch_drivers_mutex);
 53         list_for_each(list, &dsa_switch_drivers) {
 54                 struct dsa_switch_driver *drv;
 55 
 56                 drv = list_entry(list, struct dsa_switch_driver, list);
 57 
 58                 name = drv->probe(bus, sw_addr);
 59                 if (name != NULL) {
 60                         ret = drv;
 61                         break;
 62                 }
 63         }
 64         mutex_unlock(&dsa_switch_drivers_mutex);
 65 
 66         *_name = name;
 67 
 68         return ret;
 69 }
 70 
 71 
 72 /* basic switch operations **************************************************/
 73 static struct dsa_switch *
 74 dsa_switch_setup(struct dsa_switch_tree *dst, int index,
 75                  struct device *parent, struct mii_bus *bus)
 76 {
 77         struct dsa_chip_data *pd = dst->pd->chip + index;
 78         struct dsa_switch_driver *drv;
 79         struct dsa_switch *ds;
 80         int ret;
 81         char *name;
 82         int i;
 83         bool valid_name_found = false;
 84 
 85         /*
 86          * Probe for switch model.
 87          */
 88         drv = dsa_switch_probe(bus, pd->sw_addr, &name);
 89         if (drv == NULL) {
 90                 printk(KERN_ERR "%s[%d]: could not detect attached switch\n",
 91                        dst->master_netdev->name, index);
 92                 return ERR_PTR(-EINVAL);
 93         }
 94         printk(KERN_INFO "%s[%d]: detected a %s switch\n",
 95                 dst->master_netdev->name, index, name);
 96 
 97 
 98         /*
 99          * Allocate and initialise switch state.
100          */
101         ds = kzalloc(sizeof(*ds) + drv->priv_size, GFP_KERNEL);
102         if (ds == NULL)
103                 return ERR_PTR(-ENOMEM);
104 
105         ds->dst = dst;
106         ds->index = index;
107         ds->pd = dst->pd->chip + index;
108         ds->drv = drv;
109         ds->master_mii_bus = bus;
110 
111 
112         /*
113          * Validate supplied switch configuration.
114          */
115         for (i = 0; i < DSA_MAX_PORTS; i++) {
116                 char *name;
117 
118                 name = pd->port_names[i];
119                 if (name == NULL)
120                         continue;
121 
122                 if (!strcmp(name, "cpu")) {
123                         if (dst->cpu_switch != -1) {
124                                 printk(KERN_ERR "multiple cpu ports?!\n");
125                                 ret = -EINVAL;
126                                 goto out;
127                         }
128                         dst->cpu_switch = index;
129                         dst->cpu_port = i;
130                 } else if (!strcmp(name, "dsa")) {
131                         ds->dsa_port_mask |= 1 << i;
132                 } else {
133                         ds->phys_port_mask |= 1 << i;
134                 }
135                 valid_name_found = true;
136         }
137 
138         if (!valid_name_found && i == DSA_MAX_PORTS) {
139                 ret = -EINVAL;
140                 goto out;
141         }
142 
143         /*
144          * If the CPU connects to this switch, set the switch tree
145          * tagging protocol to the preferred tagging format of this
146          * switch.
147          */
148         if (ds->dst->cpu_switch == index)
149                 ds->dst->tag_protocol = drv->tag_protocol;
150 
151 
152         /*
153          * Do basic register setup.
154          */
155         ret = drv->setup(ds);
156         if (ret < 0)
157                 goto out;
158 
159         ret = drv->set_addr(ds, dst->master_netdev->dev_addr);
160         if (ret < 0)
161                 goto out;
162 
163         ds->slave_mii_bus = mdiobus_alloc();
164         if (ds->slave_mii_bus == NULL) {
165                 ret = -ENOMEM;
166                 goto out;
167         }
168         dsa_slave_mii_bus_init(ds);
169 
170         ret = mdiobus_register(ds->slave_mii_bus);
171         if (ret < 0)
172                 goto out_free;
173 
174 
175         /*
176          * Create network devices for physical switch ports.
177          */
178         for (i = 0; i < DSA_MAX_PORTS; i++) {
179                 struct net_device *slave_dev;
180 
181                 if (!(ds->phys_port_mask & (1 << i)))
182                         continue;
183 
184                 slave_dev = dsa_slave_create(ds, parent, i, pd->port_names[i]);
185                 if (slave_dev == NULL) {
186                         printk(KERN_ERR "%s[%d]: can't create dsa "
187                                "slave device for port %d(%s)\n",
188                                dst->master_netdev->name,
189                                index, i, pd->port_names[i]);
190                         continue;
191                 }
192 
193                 ds->ports[i] = slave_dev;
194         }
195 
196         return ds;
197 
198 out_free:
199         mdiobus_free(ds->slave_mii_bus);
200 out:
201         kfree(ds);
202         return ERR_PTR(ret);
203 }
204 
205 static void dsa_switch_destroy(struct dsa_switch *ds)
206 {
207 }
208 
209 
210 /* link polling *************************************************************/
211 static void dsa_link_poll_work(struct work_struct *ugly)
212 {
213         struct dsa_switch_tree *dst;
214         int i;
215 
216         dst = container_of(ugly, struct dsa_switch_tree, link_poll_work);
217 
218         for (i = 0; i < dst->pd->nr_chips; i++) {
219                 struct dsa_switch *ds = dst->ds[i];
220 
221                 if (ds != NULL && ds->drv->poll_link != NULL)
222                         ds->drv->poll_link(ds);
223         }
224 
225         mod_timer(&dst->link_poll_timer, round_jiffies(jiffies + HZ));
226 }
227 
228 static void dsa_link_poll_timer(unsigned long _dst)
229 {
230         struct dsa_switch_tree *dst = (void *)_dst;
231 
232         schedule_work(&dst->link_poll_work);
233 }
234 
235 
236 /* platform driver init and cleanup *****************************************/
237 static int dev_is_class(struct device *dev, void *class)
238 {
239         if (dev->class != NULL && !strcmp(dev->class->name, class))
240                 return 1;
241 
242         return 0;
243 }
244 
245 static struct device *dev_find_class(struct device *parent, char *class)
246 {
247         if (dev_is_class(parent, class)) {
248                 get_device(parent);
249                 return parent;
250         }
251 
252         return device_find_child(parent, class, dev_is_class);
253 }
254 
255 static struct mii_bus *dev_to_mii_bus(struct device *dev)
256 {
257         struct device *d;
258 
259         d = dev_find_class(dev, "mdio_bus");
260         if (d != NULL) {
261                 struct mii_bus *bus;
262 
263                 bus = to_mii_bus(d);
264                 put_device(d);
265 
266                 return bus;
267         }
268 
269         return NULL;
270 }
271 
272 static struct net_device *dev_to_net_device(struct device *dev)
273 {
274         struct device *d;
275 
276         d = dev_find_class(dev, "net");
277         if (d != NULL) {
278                 struct net_device *nd;
279 
280                 nd = to_net_dev(d);
281                 dev_hold(nd);
282                 put_device(d);
283 
284                 return nd;
285         }
286 
287         return NULL;
288 }
289 
290 static int dsa_probe(struct platform_device *pdev)
291 {
292         static int dsa_version_printed;
293         struct dsa_platform_data *pd = pdev->dev.platform_data;
294         struct net_device *dev;
295         struct dsa_switch_tree *dst;
296         int i;
297 
298         if (!dsa_version_printed++)
299                 printk(KERN_NOTICE "Distributed Switch Architecture "
300                         "driver version %s\n", dsa_driver_version);
301 
302         if (pd == NULL || pd->netdev == NULL)
303                 return -EINVAL;
304 
305         dev = dev_to_net_device(pd->netdev);
306         if (dev == NULL)
307                 return -EINVAL;
308 
309         if (dev->dsa_ptr != NULL) {
310                 dev_put(dev);
311                 return -EEXIST;
312         }
313 
314         dst = kzalloc(sizeof(*dst), GFP_KERNEL);
315         if (dst == NULL) {
316                 dev_put(dev);
317                 return -ENOMEM;
318         }
319 
320         platform_set_drvdata(pdev, dst);
321 
322         dst->pd = pd;
323         dst->master_netdev = dev;
324         dst->cpu_switch = -1;
325         dst->cpu_port = -1;
326 
327         for (i = 0; i < pd->nr_chips; i++) {
328                 struct mii_bus *bus;
329                 struct dsa_switch *ds;
330 
331                 bus = dev_to_mii_bus(pd->chip[i].mii_bus);
332                 if (bus == NULL) {
333                         printk(KERN_ERR "%s[%d]: no mii bus found for "
334                                 "dsa switch\n", dev->name, i);
335                         continue;
336                 }
337 
338                 ds = dsa_switch_setup(dst, i, &pdev->dev, bus);
339                 if (IS_ERR(ds)) {
340                         printk(KERN_ERR "%s[%d]: couldn't create dsa switch "
341                                 "instance (error %ld)\n", dev->name, i,
342                                 PTR_ERR(ds));
343                         continue;
344                 }
345 
346                 dst->ds[i] = ds;
347                 if (ds->drv->poll_link != NULL)
348                         dst->link_poll_needed = 1;
349         }
350 
351         /*
352          * If we use a tagging format that doesn't have an ethertype
353          * field, make sure that all packets from this point on get
354          * sent to the tag format's receive function.
355          */
356         wmb();
357         dev->dsa_ptr = (void *)dst;
358 
359         if (dst->link_poll_needed) {
360                 INIT_WORK(&dst->link_poll_work, dsa_link_poll_work);
361                 init_timer(&dst->link_poll_timer);
362                 dst->link_poll_timer.data = (unsigned long)dst;
363                 dst->link_poll_timer.function = dsa_link_poll_timer;
364                 dst->link_poll_timer.expires = round_jiffies(jiffies + HZ);
365                 add_timer(&dst->link_poll_timer);
366         }
367 
368         return 0;
369 }
370 
371 static int dsa_remove(struct platform_device *pdev)
372 {
373         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
374         int i;
375 
376         if (dst->link_poll_needed)
377                 del_timer_sync(&dst->link_poll_timer);
378 
379         flush_work(&dst->link_poll_work);
380 
381         for (i = 0; i < dst->pd->nr_chips; i++) {
382                 struct dsa_switch *ds = dst->ds[i];
383 
384                 if (ds != NULL)
385                         dsa_switch_destroy(ds);
386         }
387 
388         return 0;
389 }
390 
391 static void dsa_shutdown(struct platform_device *pdev)
392 {
393 }
394 
395 static struct platform_driver dsa_driver = {
396         .probe          = dsa_probe,
397         .remove         = dsa_remove,
398         .shutdown       = dsa_shutdown,
399         .driver = {
400                 .name   = "dsa",
401                 .owner  = THIS_MODULE,
402         },
403 };
404 
405 static int __init dsa_init_module(void)
406 {
407         int rc;
408 
409         rc = platform_driver_register(&dsa_driver);
410         if (rc)
411                 return rc;
412 
413 #ifdef CONFIG_NET_DSA_TAG_DSA
414         dev_add_pack(&dsa_packet_type);
415 #endif
416 #ifdef CONFIG_NET_DSA_TAG_EDSA
417         dev_add_pack(&edsa_packet_type);
418 #endif
419 #ifdef CONFIG_NET_DSA_TAG_TRAILER
420         dev_add_pack(&trailer_packet_type);
421 #endif
422         return 0;
423 }
424 module_init(dsa_init_module);
425 
426 static void __exit dsa_cleanup_module(void)
427 {
428 #ifdef CONFIG_NET_DSA_TAG_TRAILER
429         dev_remove_pack(&trailer_packet_type);
430 #endif
431 #ifdef CONFIG_NET_DSA_TAG_EDSA
432         dev_remove_pack(&edsa_packet_type);
433 #endif
434 #ifdef CONFIG_NET_DSA_TAG_DSA
435         dev_remove_pack(&dsa_packet_type);
436 #endif
437         platform_driver_unregister(&dsa_driver);
438 }
439 module_exit(dsa_cleanup_module);
440 
441 MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
442 MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
443 MODULE_LICENSE("GPL");
444 MODULE_ALIAS("platform:dsa");
445 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp