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Linux/net/dsa/dsa.c

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

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