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

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

Version: ~ [ linux-5.3-rc5 ] ~ [ linux-5.2.9 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.67 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.139 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.189 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.189 ] ~ [ 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-3.16.72 ] ~ [ 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 
 84         /*
 85          * Probe for switch model.
 86          */
 87         drv = dsa_switch_probe(bus, pd->sw_addr, &name);
 88         if (drv == NULL) {
 89                 printk(KERN_ERR "%s[%d]: could not detect attached switch\n",
 90                        dst->master_netdev->name, index);
 91                 return ERR_PTR(-EINVAL);
 92         }
 93         printk(KERN_INFO "%s[%d]: detected a %s switch\n",
 94                 dst->master_netdev->name, index, name);
 95 
 96 
 97         /*
 98          * Allocate and initialise switch state.
 99          */
100         ds = kzalloc(sizeof(*ds) + drv->priv_size, GFP_KERNEL);
101         if (ds == NULL)
102                 return ERR_PTR(-ENOMEM);
103 
104         ds->dst = dst;
105         ds->index = index;
106         ds->pd = dst->pd->chip + index;
107         ds->drv = drv;
108         ds->master_mii_bus = bus;
109 
110 
111         /*
112          * Validate supplied switch configuration.
113          */
114         for (i = 0; i < DSA_MAX_PORTS; i++) {
115                 char *name;
116 
117                 name = pd->port_names[i];
118                 if (name == NULL)
119                         continue;
120 
121                 if (!strcmp(name, "cpu")) {
122                         if (dst->cpu_switch != -1) {
123                                 printk(KERN_ERR "multiple cpu ports?!\n");
124                                 ret = -EINVAL;
125                                 goto out;
126                         }
127                         dst->cpu_switch = index;
128                         dst->cpu_port = i;
129                 } else if (!strcmp(name, "dsa")) {
130                         ds->dsa_port_mask |= 1 << i;
131                 } else {
132                         ds->phys_port_mask |= 1 << i;
133                 }
134         }
135 
136 
137         /*
138          * If the CPU connects to this switch, set the switch tree
139          * tagging protocol to the preferred tagging format of this
140          * switch.
141          */
142         if (ds->dst->cpu_switch == index)
143                 ds->dst->tag_protocol = drv->tag_protocol;
144 
145 
146         /*
147          * Do basic register setup.
148          */
149         ret = drv->setup(ds);
150         if (ret < 0)
151                 goto out;
152 
153         ret = drv->set_addr(ds, dst->master_netdev->dev_addr);
154         if (ret < 0)
155                 goto out;
156 
157         ds->slave_mii_bus = mdiobus_alloc();
158         if (ds->slave_mii_bus == NULL) {
159                 ret = -ENOMEM;
160                 goto out;
161         }
162         dsa_slave_mii_bus_init(ds);
163 
164         ret = mdiobus_register(ds->slave_mii_bus);
165         if (ret < 0)
166                 goto out_free;
167 
168 
169         /*
170          * Create network devices for physical switch ports.
171          */
172         for (i = 0; i < DSA_MAX_PORTS; i++) {
173                 struct net_device *slave_dev;
174 
175                 if (!(ds->phys_port_mask & (1 << i)))
176                         continue;
177 
178                 slave_dev = dsa_slave_create(ds, parent, i, pd->port_names[i]);
179                 if (slave_dev == NULL) {
180                         printk(KERN_ERR "%s[%d]: can't create dsa "
181                                "slave device for port %d(%s)\n",
182                                dst->master_netdev->name,
183                                index, i, pd->port_names[i]);
184                         continue;
185                 }
186 
187                 ds->ports[i] = slave_dev;
188         }
189 
190         return ds;
191 
192 out_free:
193         mdiobus_free(ds->slave_mii_bus);
194 out:
195         kfree(ds);
196         return ERR_PTR(ret);
197 }
198 
199 static void dsa_switch_destroy(struct dsa_switch *ds)
200 {
201 }
202 
203 
204 /* link polling *************************************************************/
205 static void dsa_link_poll_work(struct work_struct *ugly)
206 {
207         struct dsa_switch_tree *dst;
208         int i;
209 
210         dst = container_of(ugly, struct dsa_switch_tree, link_poll_work);
211 
212         for (i = 0; i < dst->pd->nr_chips; i++) {
213                 struct dsa_switch *ds = dst->ds[i];
214 
215                 if (ds != NULL && ds->drv->poll_link != NULL)
216                         ds->drv->poll_link(ds);
217         }
218 
219         mod_timer(&dst->link_poll_timer, round_jiffies(jiffies + HZ));
220 }
221 
222 static void dsa_link_poll_timer(unsigned long _dst)
223 {
224         struct dsa_switch_tree *dst = (void *)_dst;
225 
226         schedule_work(&dst->link_poll_work);
227 }
228 
229 
230 /* platform driver init and cleanup *****************************************/
231 static int dev_is_class(struct device *dev, void *class)
232 {
233         if (dev->class != NULL && !strcmp(dev->class->name, class))
234                 return 1;
235 
236         return 0;
237 }
238 
239 static struct device *dev_find_class(struct device *parent, char *class)
240 {
241         if (dev_is_class(parent, class)) {
242                 get_device(parent);
243                 return parent;
244         }
245 
246         return device_find_child(parent, class, dev_is_class);
247 }
248 
249 static struct mii_bus *dev_to_mii_bus(struct device *dev)
250 {
251         struct device *d;
252 
253         d = dev_find_class(dev, "mdio_bus");
254         if (d != NULL) {
255                 struct mii_bus *bus;
256 
257                 bus = to_mii_bus(d);
258                 put_device(d);
259 
260                 return bus;
261         }
262 
263         return NULL;
264 }
265 
266 static struct net_device *dev_to_net_device(struct device *dev)
267 {
268         struct device *d;
269 
270         d = dev_find_class(dev, "net");
271         if (d != NULL) {
272                 struct net_device *nd;
273 
274                 nd = to_net_dev(d);
275                 dev_hold(nd);
276                 put_device(d);
277 
278                 return nd;
279         }
280 
281         return NULL;
282 }
283 
284 static int dsa_probe(struct platform_device *pdev)
285 {
286         static int dsa_version_printed;
287         struct dsa_platform_data *pd = pdev->dev.platform_data;
288         struct net_device *dev;
289         struct dsa_switch_tree *dst;
290         int i;
291 
292         if (!dsa_version_printed++)
293                 printk(KERN_NOTICE "Distributed Switch Architecture "
294                         "driver version %s\n", dsa_driver_version);
295 
296         if (pd == NULL || pd->netdev == NULL)
297                 return -EINVAL;
298 
299         dev = dev_to_net_device(pd->netdev);
300         if (dev == NULL)
301                 return -EINVAL;
302 
303         if (dev->dsa_ptr != NULL) {
304                 dev_put(dev);
305                 return -EEXIST;
306         }
307 
308         dst = kzalloc(sizeof(*dst), GFP_KERNEL);
309         if (dst == NULL) {
310                 dev_put(dev);
311                 return -ENOMEM;
312         }
313 
314         platform_set_drvdata(pdev, dst);
315 
316         dst->pd = pd;
317         dst->master_netdev = dev;
318         dst->cpu_switch = -1;
319         dst->cpu_port = -1;
320 
321         for (i = 0; i < pd->nr_chips; i++) {
322                 struct mii_bus *bus;
323                 struct dsa_switch *ds;
324 
325                 bus = dev_to_mii_bus(pd->chip[i].mii_bus);
326                 if (bus == NULL) {
327                         printk(KERN_ERR "%s[%d]: no mii bus found for "
328                                 "dsa switch\n", dev->name, i);
329                         continue;
330                 }
331 
332                 ds = dsa_switch_setup(dst, i, &pdev->dev, bus);
333                 if (IS_ERR(ds)) {
334                         printk(KERN_ERR "%s[%d]: couldn't create dsa switch "
335                                 "instance (error %ld)\n", dev->name, i,
336                                 PTR_ERR(ds));
337                         continue;
338                 }
339 
340                 dst->ds[i] = ds;
341                 if (ds->drv->poll_link != NULL)
342                         dst->link_poll_needed = 1;
343         }
344 
345         /*
346          * If we use a tagging format that doesn't have an ethertype
347          * field, make sure that all packets from this point on get
348          * sent to the tag format's receive function.
349          */
350         wmb();
351         dev->dsa_ptr = (void *)dst;
352 
353         if (dst->link_poll_needed) {
354                 INIT_WORK(&dst->link_poll_work, dsa_link_poll_work);
355                 init_timer(&dst->link_poll_timer);
356                 dst->link_poll_timer.data = (unsigned long)dst;
357                 dst->link_poll_timer.function = dsa_link_poll_timer;
358                 dst->link_poll_timer.expires = round_jiffies(jiffies + HZ);
359                 add_timer(&dst->link_poll_timer);
360         }
361 
362         return 0;
363 }
364 
365 static int dsa_remove(struct platform_device *pdev)
366 {
367         struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
368         int i;
369 
370         if (dst->link_poll_needed)
371                 del_timer_sync(&dst->link_poll_timer);
372 
373         flush_work_sync(&dst->link_poll_work);
374 
375         for (i = 0; i < dst->pd->nr_chips; i++) {
376                 struct dsa_switch *ds = dst->ds[i];
377 
378                 if (ds != NULL)
379                         dsa_switch_destroy(ds);
380         }
381 
382         return 0;
383 }
384 
385 static void dsa_shutdown(struct platform_device *pdev)
386 {
387 }
388 
389 static struct platform_driver dsa_driver = {
390         .probe          = dsa_probe,
391         .remove         = dsa_remove,
392         .shutdown       = dsa_shutdown,
393         .driver = {
394                 .name   = "dsa",
395                 .owner  = THIS_MODULE,
396         },
397 };
398 
399 static int __init dsa_init_module(void)
400 {
401         int rc;
402 
403         rc = platform_driver_register(&dsa_driver);
404         if (rc)
405                 return rc;
406 
407 #ifdef CONFIG_NET_DSA_TAG_DSA
408         dev_add_pack(&dsa_packet_type);
409 #endif
410 #ifdef CONFIG_NET_DSA_TAG_EDSA
411         dev_add_pack(&edsa_packet_type);
412 #endif
413 #ifdef CONFIG_NET_DSA_TAG_TRAILER
414         dev_add_pack(&trailer_packet_type);
415 #endif
416         return 0;
417 }
418 module_init(dsa_init_module);
419 
420 static void __exit dsa_cleanup_module(void)
421 {
422 #ifdef CONFIG_NET_DSA_TAG_TRAILER
423         dev_remove_pack(&trailer_packet_type);
424 #endif
425 #ifdef CONFIG_NET_DSA_TAG_EDSA
426         dev_remove_pack(&edsa_packet_type);
427 #endif
428 #ifdef CONFIG_NET_DSA_TAG_DSA
429         dev_remove_pack(&dsa_packet_type);
430 #endif
431         platform_driver_unregister(&dsa_driver);
432 }
433 module_exit(dsa_cleanup_module);
434 
435 MODULE_AUTHOR("Lennert Buytenhek <buytenh@wantstofly.org>");
436 MODULE_DESCRIPTION("Driver for Distributed Switch Architecture switch chips");
437 MODULE_LICENSE("GPL");
438 MODULE_ALIAS("platform:dsa");
439 

~ [ 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