1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Texas Instruments switchdev Driver
4  *
5  * Copyright (C) 2019 Texas Instruments
6  *
7  */
8 
9 #include <linux/etherdevice.h>
10 #include <linux/if_bridge.h>
11 #include <linux/netdevice.h>
12 #include <linux/workqueue.h>
13 #include <net/switchdev.h>
14 
15 #include "cpsw.h"
16 #include "cpsw_ale.h"
17 #include "cpsw_priv.h"
18 #include "cpsw_switchdev.h"
19 
20 struct cpsw_switchdev_event_work {
21 	struct work_struct work;
22 	struct switchdev_notifier_fdb_info fdb_info;
23 	struct cpsw_priv *priv;
24 	unsigned long event;
25 };
26 
cpsw_port_stp_state_set(struct cpsw_priv * priv,u8 state)27 static int cpsw_port_stp_state_set(struct cpsw_priv *priv, u8 state)
28 {
29 	struct cpsw_common *cpsw = priv->cpsw;
30 	u8 cpsw_state;
31 	int ret = 0;
32 
33 	switch (state) {
34 	case BR_STATE_FORWARDING:
35 		cpsw_state = ALE_PORT_STATE_FORWARD;
36 		break;
37 	case BR_STATE_LEARNING:
38 		cpsw_state = ALE_PORT_STATE_LEARN;
39 		break;
40 	case BR_STATE_DISABLED:
41 		cpsw_state = ALE_PORT_STATE_DISABLE;
42 		break;
43 	case BR_STATE_LISTENING:
44 	case BR_STATE_BLOCKING:
45 		cpsw_state = ALE_PORT_STATE_BLOCK;
46 		break;
47 	default:
48 		return -EOPNOTSUPP;
49 	}
50 
51 	ret = cpsw_ale_control_set(cpsw->ale, priv->emac_port,
52 				   ALE_PORT_STATE, cpsw_state);
53 	dev_dbg(priv->dev, "ale state: %u\n", cpsw_state);
54 
55 	return ret;
56 }
57 
cpsw_port_attr_br_flags_set(struct cpsw_priv * priv,struct net_device * orig_dev,struct switchdev_brport_flags flags)58 static int cpsw_port_attr_br_flags_set(struct cpsw_priv *priv,
59 				       struct net_device *orig_dev,
60 				       struct switchdev_brport_flags flags)
61 {
62 	struct cpsw_common *cpsw = priv->cpsw;
63 
64 	if (flags.mask & BR_MCAST_FLOOD) {
65 		bool unreg_mcast_add = false;
66 
67 		if (flags.val & BR_MCAST_FLOOD)
68 			unreg_mcast_add = true;
69 
70 		dev_dbg(priv->dev, "BR_MCAST_FLOOD: %d port %u\n",
71 			unreg_mcast_add, priv->emac_port);
72 
73 		cpsw_ale_set_unreg_mcast(cpsw->ale, BIT(priv->emac_port),
74 					 unreg_mcast_add);
75 	}
76 
77 	return 0;
78 }
79 
cpsw_port_attr_br_flags_pre_set(struct net_device * netdev,struct switchdev_brport_flags flags)80 static int cpsw_port_attr_br_flags_pre_set(struct net_device *netdev,
81 					   struct switchdev_brport_flags flags)
82 {
83 	if (flags.mask & ~(BR_LEARNING | BR_MCAST_FLOOD))
84 		return -EINVAL;
85 
86 	return 0;
87 }
88 
cpsw_port_attr_set(struct net_device * ndev,const void * ctx,const struct switchdev_attr * attr,struct netlink_ext_ack * extack)89 static int cpsw_port_attr_set(struct net_device *ndev, const void *ctx,
90 			      const struct switchdev_attr *attr,
91 			      struct netlink_ext_ack *extack)
92 {
93 	struct cpsw_priv *priv = netdev_priv(ndev);
94 	int ret;
95 
96 	dev_dbg(priv->dev, "attr: id %u port: %u\n", attr->id, priv->emac_port);
97 
98 	switch (attr->id) {
99 	case SWITCHDEV_ATTR_ID_PORT_PRE_BRIDGE_FLAGS:
100 		ret = cpsw_port_attr_br_flags_pre_set(ndev,
101 						      attr->u.brport_flags);
102 		break;
103 	case SWITCHDEV_ATTR_ID_PORT_STP_STATE:
104 		ret = cpsw_port_stp_state_set(priv, attr->u.stp_state);
105 		dev_dbg(priv->dev, "stp state: %u\n", attr->u.stp_state);
106 		break;
107 	case SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS:
108 		ret = cpsw_port_attr_br_flags_set(priv, attr->orig_dev,
109 						  attr->u.brport_flags);
110 		break;
111 	default:
112 		ret = -EOPNOTSUPP;
113 		break;
114 	}
115 
116 	return ret;
117 }
118 
cpsw_get_pvid(struct cpsw_priv * priv)119 static u16 cpsw_get_pvid(struct cpsw_priv *priv)
120 {
121 	struct cpsw_common *cpsw = priv->cpsw;
122 	u32 __iomem *port_vlan_reg;
123 	u32 pvid;
124 
125 	if (priv->emac_port) {
126 		int reg = CPSW2_PORT_VLAN;
127 
128 		if (cpsw->version == CPSW_VERSION_1)
129 			reg = CPSW1_PORT_VLAN;
130 		pvid = slave_read(cpsw->slaves + (priv->emac_port - 1), reg);
131 	} else {
132 		port_vlan_reg = &cpsw->host_port_regs->port_vlan;
133 		pvid = readl(port_vlan_reg);
134 	}
135 
136 	pvid = pvid & 0xfff;
137 
138 	return pvid;
139 }
140 
cpsw_set_pvid(struct cpsw_priv * priv,u16 vid,bool cfi,u32 cos)141 static void cpsw_set_pvid(struct cpsw_priv *priv, u16 vid, bool cfi, u32 cos)
142 {
143 	struct cpsw_common *cpsw = priv->cpsw;
144 	void __iomem *port_vlan_reg;
145 	u32 pvid;
146 
147 	pvid = vid;
148 	pvid |= cfi ? BIT(12) : 0;
149 	pvid |= (cos & 0x7) << 13;
150 
151 	if (priv->emac_port) {
152 		int reg = CPSW2_PORT_VLAN;
153 
154 		if (cpsw->version == CPSW_VERSION_1)
155 			reg = CPSW1_PORT_VLAN;
156 		/* no barrier */
157 		slave_write(cpsw->slaves + (priv->emac_port - 1), pvid, reg);
158 	} else {
159 		/* CPU port */
160 		port_vlan_reg = &cpsw->host_port_regs->port_vlan;
161 		writel(pvid, port_vlan_reg);
162 	}
163 }
164 
cpsw_port_vlan_add(struct cpsw_priv * priv,bool untag,bool pvid,u16 vid,struct net_device * orig_dev)165 static int cpsw_port_vlan_add(struct cpsw_priv *priv, bool untag, bool pvid,
166 			      u16 vid, struct net_device *orig_dev)
167 {
168 	bool cpu_port = netif_is_bridge_master(orig_dev);
169 	struct cpsw_common *cpsw = priv->cpsw;
170 	int unreg_mcast_mask = 0;
171 	int reg_mcast_mask = 0;
172 	int untag_mask = 0;
173 	int port_mask;
174 	int ret = 0;
175 	u32 flags;
176 
177 	if (cpu_port) {
178 		port_mask = BIT(HOST_PORT_NUM);
179 		flags = orig_dev->flags;
180 		unreg_mcast_mask = port_mask;
181 	} else {
182 		port_mask = BIT(priv->emac_port);
183 		flags = priv->ndev->flags;
184 	}
185 
186 	if (flags & IFF_MULTICAST)
187 		reg_mcast_mask = port_mask;
188 
189 	if (untag)
190 		untag_mask = port_mask;
191 
192 	ret = cpsw_ale_vlan_add_modify(cpsw->ale, vid, port_mask, untag_mask,
193 				       reg_mcast_mask, unreg_mcast_mask);
194 	if (ret) {
195 		dev_err(priv->dev, "Unable to add vlan\n");
196 		return ret;
197 	}
198 
199 	if (cpu_port)
200 		cpsw_ale_add_ucast(cpsw->ale, priv->mac_addr,
201 				   HOST_PORT_NUM, ALE_VLAN, vid);
202 	if (!pvid)
203 		return ret;
204 
205 	cpsw_set_pvid(priv, vid, 0, 0);
206 
207 	dev_dbg(priv->dev, "VID add: %s: vid:%u ports:%X\n",
208 		priv->ndev->name, vid, port_mask);
209 	return ret;
210 }
211 
cpsw_port_vlan_del(struct cpsw_priv * priv,u16 vid,struct net_device * orig_dev)212 static int cpsw_port_vlan_del(struct cpsw_priv *priv, u16 vid,
213 			      struct net_device *orig_dev)
214 {
215 	bool cpu_port = netif_is_bridge_master(orig_dev);
216 	struct cpsw_common *cpsw = priv->cpsw;
217 	int port_mask;
218 	int ret = 0;
219 
220 	if (cpu_port)
221 		port_mask = BIT(HOST_PORT_NUM);
222 	else
223 		port_mask = BIT(priv->emac_port);
224 
225 	ret = cpsw_ale_vlan_del_modify(cpsw->ale, vid, port_mask);
226 	if (ret != 0)
227 		return ret;
228 
229 	/* We don't care for the return value here, error is returned only if
230 	 * the unicast entry is not present
231 	 */
232 	if (cpu_port)
233 		cpsw_ale_del_ucast(cpsw->ale, priv->mac_addr,
234 				   HOST_PORT_NUM, ALE_VLAN, vid);
235 
236 	if (vid == cpsw_get_pvid(priv))
237 		cpsw_set_pvid(priv, 0, 0, 0);
238 
239 	/* We don't care for the return value here, error is returned only if
240 	 * the multicast entry is not present
241 	 */
242 	cpsw_ale_del_mcast(cpsw->ale, priv->ndev->broadcast,
243 			   port_mask, ALE_VLAN, vid);
244 	dev_dbg(priv->dev, "VID del: %s: vid:%u ports:%X\n",
245 		priv->ndev->name, vid, port_mask);
246 
247 	return ret;
248 }
249 
cpsw_port_vlans_add(struct cpsw_priv * priv,const struct switchdev_obj_port_vlan * vlan)250 static int cpsw_port_vlans_add(struct cpsw_priv *priv,
251 			       const struct switchdev_obj_port_vlan *vlan)
252 {
253 	bool untag = vlan->flags & BRIDGE_VLAN_INFO_UNTAGGED;
254 	struct net_device *orig_dev = vlan->obj.orig_dev;
255 	bool pvid = vlan->flags & BRIDGE_VLAN_INFO_PVID;
256 
257 	dev_dbg(priv->dev, "VID add: %s: vid:%u flags:%X\n",
258 		priv->ndev->name, vlan->vid, vlan->flags);
259 
260 	return cpsw_port_vlan_add(priv, untag, pvid, vlan->vid, orig_dev);
261 }
262 
cpsw_port_mdb_add(struct cpsw_priv * priv,struct switchdev_obj_port_mdb * mdb)263 static int cpsw_port_mdb_add(struct cpsw_priv *priv,
264 			     struct switchdev_obj_port_mdb *mdb)
265 
266 {
267 	struct net_device *orig_dev = mdb->obj.orig_dev;
268 	bool cpu_port = netif_is_bridge_master(orig_dev);
269 	struct cpsw_common *cpsw = priv->cpsw;
270 	int port_mask;
271 	int err;
272 
273 	if (cpu_port)
274 		port_mask = BIT(HOST_PORT_NUM);
275 	else
276 		port_mask = BIT(priv->emac_port);
277 
278 	err = cpsw_ale_add_mcast(cpsw->ale, mdb->addr, port_mask,
279 				 ALE_VLAN, mdb->vid, 0);
280 	dev_dbg(priv->dev, "MDB add: %s: vid %u:%pM  ports: %X\n",
281 		priv->ndev->name, mdb->vid, mdb->addr, port_mask);
282 
283 	return err;
284 }
285 
cpsw_port_mdb_del(struct cpsw_priv * priv,struct switchdev_obj_port_mdb * mdb)286 static int cpsw_port_mdb_del(struct cpsw_priv *priv,
287 			     struct switchdev_obj_port_mdb *mdb)
288 
289 {
290 	struct net_device *orig_dev = mdb->obj.orig_dev;
291 	bool cpu_port = netif_is_bridge_master(orig_dev);
292 	struct cpsw_common *cpsw = priv->cpsw;
293 	int del_mask;
294 	int err;
295 
296 	if (cpu_port)
297 		del_mask = BIT(HOST_PORT_NUM);
298 	else
299 		del_mask = BIT(priv->emac_port);
300 
301 	err = cpsw_ale_del_mcast(cpsw->ale, mdb->addr, del_mask,
302 				 ALE_VLAN, mdb->vid);
303 	dev_dbg(priv->dev, "MDB del: %s: vid %u:%pM  ports: %X\n",
304 		priv->ndev->name, mdb->vid, mdb->addr, del_mask);
305 
306 	return err;
307 }
308 
cpsw_port_obj_add(struct net_device * ndev,const void * ctx,const struct switchdev_obj * obj,struct netlink_ext_ack * extack)309 static int cpsw_port_obj_add(struct net_device *ndev, const void *ctx,
310 			     const struct switchdev_obj *obj,
311 			     struct netlink_ext_ack *extack)
312 {
313 	struct switchdev_obj_port_vlan *vlan = SWITCHDEV_OBJ_PORT_VLAN(obj);
314 	struct switchdev_obj_port_mdb *mdb = SWITCHDEV_OBJ_PORT_MDB(obj);
315 	struct cpsw_priv *priv = netdev_priv(ndev);
316 	int err = 0;
317 
318 	dev_dbg(priv->dev, "obj_add: id %u port: %u\n",
319 		obj->id, priv->emac_port);
320 
321 	switch (obj->id) {
322 	case SWITCHDEV_OBJ_ID_PORT_VLAN:
323 		err = cpsw_port_vlans_add(priv, vlan);
324 		break;
325 	case SWITCHDEV_OBJ_ID_PORT_MDB:
326 	case SWITCHDEV_OBJ_ID_HOST_MDB:
327 		err = cpsw_port_mdb_add(priv, mdb);
328 		break;
329 	default:
330 		err = -EOPNOTSUPP;
331 		break;
332 	}
333 
334 	return err;
335 }
336 
cpsw_port_obj_del(struct net_device * ndev,const void * ctx,const struct switchdev_obj * obj)337 static int cpsw_port_obj_del(struct net_device *ndev, const void *ctx,
338 			     const struct switchdev_obj *obj)
339 {
340 	struct switchdev_obj_port_vlan *vlan = SWITCHDEV_OBJ_PORT_VLAN(obj);
341 	struct switchdev_obj_port_mdb *mdb = SWITCHDEV_OBJ_PORT_MDB(obj);
342 	struct cpsw_priv *priv = netdev_priv(ndev);
343 	int err = 0;
344 
345 	dev_dbg(priv->dev, "obj_del: id %u port: %u\n",
346 		obj->id, priv->emac_port);
347 
348 	switch (obj->id) {
349 	case SWITCHDEV_OBJ_ID_PORT_VLAN:
350 		err = cpsw_port_vlan_del(priv, vlan->vid, vlan->obj.orig_dev);
351 		break;
352 	case SWITCHDEV_OBJ_ID_PORT_MDB:
353 	case SWITCHDEV_OBJ_ID_HOST_MDB:
354 		err = cpsw_port_mdb_del(priv, mdb);
355 		break;
356 	default:
357 		err = -EOPNOTSUPP;
358 		break;
359 	}
360 
361 	return err;
362 }
363 
cpsw_fdb_offload_notify(struct net_device * ndev,struct switchdev_notifier_fdb_info * rcv)364 static void cpsw_fdb_offload_notify(struct net_device *ndev,
365 				    struct switchdev_notifier_fdb_info *rcv)
366 {
367 	struct switchdev_notifier_fdb_info info = {};
368 
369 	info.addr = rcv->addr;
370 	info.vid = rcv->vid;
371 	info.offloaded = true;
372 	call_switchdev_notifiers(SWITCHDEV_FDB_OFFLOADED,
373 				 ndev, &info.info, NULL);
374 }
375 
cpsw_switchdev_event_work(struct work_struct * work)376 static void cpsw_switchdev_event_work(struct work_struct *work)
377 {
378 	struct cpsw_switchdev_event_work *switchdev_work =
379 		container_of(work, struct cpsw_switchdev_event_work, work);
380 	struct cpsw_priv *priv = switchdev_work->priv;
381 	struct switchdev_notifier_fdb_info *fdb;
382 	struct cpsw_common *cpsw = priv->cpsw;
383 	int port = priv->emac_port;
384 
385 	rtnl_lock();
386 	switch (switchdev_work->event) {
387 	case SWITCHDEV_FDB_ADD_TO_DEVICE:
388 		fdb = &switchdev_work->fdb_info;
389 
390 		dev_dbg(cpsw->dev, "cpsw_fdb_add: MACID = %pM vid = %u flags = %u %u -- port %d\n",
391 			fdb->addr, fdb->vid, fdb->added_by_user,
392 			fdb->offloaded, port);
393 
394 		if (!fdb->added_by_user || fdb->is_local)
395 			break;
396 		if (memcmp(priv->mac_addr, (u8 *)fdb->addr, ETH_ALEN) == 0)
397 			port = HOST_PORT_NUM;
398 
399 		cpsw_ale_add_ucast(cpsw->ale, (u8 *)fdb->addr, port,
400 				   fdb->vid ? ALE_VLAN : 0, fdb->vid);
401 		cpsw_fdb_offload_notify(priv->ndev, fdb);
402 		break;
403 	case SWITCHDEV_FDB_DEL_TO_DEVICE:
404 		fdb = &switchdev_work->fdb_info;
405 
406 		dev_dbg(cpsw->dev, "cpsw_fdb_del: MACID = %pM vid = %u flags = %u %u -- port %d\n",
407 			fdb->addr, fdb->vid, fdb->added_by_user,
408 			fdb->offloaded, port);
409 
410 		if (!fdb->added_by_user || fdb->is_local)
411 			break;
412 		if (memcmp(priv->mac_addr, (u8 *)fdb->addr, ETH_ALEN) == 0)
413 			port = HOST_PORT_NUM;
414 
415 		cpsw_ale_del_ucast(cpsw->ale, (u8 *)fdb->addr, port,
416 				   fdb->vid ? ALE_VLAN : 0, fdb->vid);
417 		break;
418 	default:
419 		break;
420 	}
421 	rtnl_unlock();
422 
423 	kfree(switchdev_work->fdb_info.addr);
424 	kfree(switchdev_work);
425 	dev_put(priv->ndev);
426 }
427 
428 /* called under rcu_read_lock() */
cpsw_switchdev_event(struct notifier_block * unused,unsigned long event,void * ptr)429 static int cpsw_switchdev_event(struct notifier_block *unused,
430 				unsigned long event, void *ptr)
431 {
432 	struct net_device *ndev = switchdev_notifier_info_to_dev(ptr);
433 	struct switchdev_notifier_fdb_info *fdb_info = ptr;
434 	struct cpsw_switchdev_event_work *switchdev_work;
435 	struct cpsw_priv *priv = netdev_priv(ndev);
436 	int err;
437 
438 	if (event == SWITCHDEV_PORT_ATTR_SET) {
439 		err = switchdev_handle_port_attr_set(ndev, ptr,
440 						     cpsw_port_dev_check,
441 						     cpsw_port_attr_set);
442 		return notifier_from_errno(err);
443 	}
444 
445 	if (!cpsw_port_dev_check(ndev))
446 		return NOTIFY_DONE;
447 
448 	switchdev_work = kzalloc(sizeof(*switchdev_work), GFP_ATOMIC);
449 	if (WARN_ON(!switchdev_work))
450 		return NOTIFY_BAD;
451 
452 	INIT_WORK(&switchdev_work->work, cpsw_switchdev_event_work);
453 	switchdev_work->priv = priv;
454 	switchdev_work->event = event;
455 
456 	switch (event) {
457 	case SWITCHDEV_FDB_ADD_TO_DEVICE:
458 	case SWITCHDEV_FDB_DEL_TO_DEVICE:
459 		memcpy(&switchdev_work->fdb_info, ptr,
460 		       sizeof(switchdev_work->fdb_info));
461 		switchdev_work->fdb_info.addr = kzalloc(ETH_ALEN, GFP_ATOMIC);
462 		if (!switchdev_work->fdb_info.addr)
463 			goto err_addr_alloc;
464 		ether_addr_copy((u8 *)switchdev_work->fdb_info.addr,
465 				fdb_info->addr);
466 		dev_hold(ndev);
467 		break;
468 	default:
469 		kfree(switchdev_work);
470 		return NOTIFY_DONE;
471 	}
472 
473 	queue_work(system_long_wq, &switchdev_work->work);
474 
475 	return NOTIFY_DONE;
476 
477 err_addr_alloc:
478 	kfree(switchdev_work);
479 	return NOTIFY_BAD;
480 }
481 
482 static struct notifier_block cpsw_switchdev_notifier = {
483 	.notifier_call = cpsw_switchdev_event,
484 };
485 
cpsw_switchdev_blocking_event(struct notifier_block * unused,unsigned long event,void * ptr)486 static int cpsw_switchdev_blocking_event(struct notifier_block *unused,
487 					 unsigned long event, void *ptr)
488 {
489 	struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
490 	int err;
491 
492 	switch (event) {
493 	case SWITCHDEV_PORT_OBJ_ADD:
494 		err = switchdev_handle_port_obj_add(dev, ptr,
495 						    cpsw_port_dev_check,
496 						    cpsw_port_obj_add);
497 		return notifier_from_errno(err);
498 	case SWITCHDEV_PORT_OBJ_DEL:
499 		err = switchdev_handle_port_obj_del(dev, ptr,
500 						    cpsw_port_dev_check,
501 						    cpsw_port_obj_del);
502 		return notifier_from_errno(err);
503 	case SWITCHDEV_PORT_ATTR_SET:
504 		err = switchdev_handle_port_attr_set(dev, ptr,
505 						     cpsw_port_dev_check,
506 						     cpsw_port_attr_set);
507 		return notifier_from_errno(err);
508 	default:
509 		break;
510 	}
511 
512 	return NOTIFY_DONE;
513 }
514 
515 static struct notifier_block cpsw_switchdev_bl_notifier = {
516 	.notifier_call = cpsw_switchdev_blocking_event,
517 };
518 
cpsw_switchdev_register_notifiers(struct cpsw_common * cpsw)519 int cpsw_switchdev_register_notifiers(struct cpsw_common *cpsw)
520 {
521 	int ret = 0;
522 
523 	ret = register_switchdev_notifier(&cpsw_switchdev_notifier);
524 	if (ret) {
525 		dev_err(cpsw->dev, "register switchdev notifier fail ret:%d\n",
526 			ret);
527 		return ret;
528 	}
529 
530 	ret = register_switchdev_blocking_notifier(&cpsw_switchdev_bl_notifier);
531 	if (ret) {
532 		dev_err(cpsw->dev, "register switchdev blocking notifier ret:%d\n",
533 			ret);
534 		unregister_switchdev_notifier(&cpsw_switchdev_notifier);
535 	}
536 
537 	return ret;
538 }
539 
cpsw_switchdev_unregister_notifiers(struct cpsw_common * cpsw)540 void cpsw_switchdev_unregister_notifiers(struct cpsw_common *cpsw)
541 {
542 	unregister_switchdev_blocking_notifier(&cpsw_switchdev_bl_notifier);
543 	unregister_switchdev_notifier(&cpsw_switchdev_notifier);
544 }
545