xref: /openbmc/linux/net/devlink/rate.c (revision 6db6b729) 
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Copyright (c) 2016 Mellanox Technologies. All rights reserved.
4  * Copyright (c) 2016 Jiri Pirko <jiri@mellanox.com>
5  */
6 
7 #include "devl_internal.h"
8 
9 static inline bool
10 devlink_rate_is_leaf(struct devlink_rate *devlink_rate)
11 {
12 	return devlink_rate->type == DEVLINK_RATE_TYPE_LEAF;
13 }
14 
15 static inline bool
16 devlink_rate_is_node(struct devlink_rate *devlink_rate)
17 {
18 	return devlink_rate->type == DEVLINK_RATE_TYPE_NODE;
19 }
20 
21 static struct devlink_rate *
22 devlink_rate_leaf_get_from_info(struct devlink *devlink, struct genl_info *info)
23 {
24 	struct devlink_rate *devlink_rate;
25 	struct devlink_port *devlink_port;
26 
27 	devlink_port = devlink_port_get_from_attrs(devlink, info->attrs);
28 	if (IS_ERR(devlink_port))
29 		return ERR_CAST(devlink_port);
30 	devlink_rate = devlink_port->devlink_rate;
31 	return devlink_rate ?: ERR_PTR(-ENODEV);
32 }
33 
34 static struct devlink_rate *
35 devlink_rate_node_get_by_name(struct devlink *devlink, const char *node_name)
36 {
37 	static struct devlink_rate *devlink_rate;
38 
39 	list_for_each_entry(devlink_rate, &devlink->rate_list, list) {
40 		if (devlink_rate_is_node(devlink_rate) &&
41 		    !strcmp(node_name, devlink_rate->name))
42 			return devlink_rate;
43 	}
44 	return ERR_PTR(-ENODEV);
45 }
46 
47 static struct devlink_rate *
48 devlink_rate_node_get_from_attrs(struct devlink *devlink, struct nlattr **attrs)
49 {
50 	const char *rate_node_name;
51 	size_t len;
52 
53 	if (!attrs[DEVLINK_ATTR_RATE_NODE_NAME])
54 		return ERR_PTR(-EINVAL);
55 	rate_node_name = nla_data(attrs[DEVLINK_ATTR_RATE_NODE_NAME]);
56 	len = strlen(rate_node_name);
57 	/* Name cannot be empty or decimal number */
58 	if (!len || strspn(rate_node_name, "0123456789") == len)
59 		return ERR_PTR(-EINVAL);
60 
61 	return devlink_rate_node_get_by_name(devlink, rate_node_name);
62 }
63 
64 static struct devlink_rate *
65 devlink_rate_node_get_from_info(struct devlink *devlink, struct genl_info *info)
66 {
67 	return devlink_rate_node_get_from_attrs(devlink, info->attrs);
68 }
69 
70 static struct devlink_rate *
71 devlink_rate_get_from_info(struct devlink *devlink, struct genl_info *info)
72 {
73 	struct nlattr **attrs = info->attrs;
74 
75 	if (attrs[DEVLINK_ATTR_PORT_INDEX])
76 		return devlink_rate_leaf_get_from_info(devlink, info);
77 	else if (attrs[DEVLINK_ATTR_RATE_NODE_NAME])
78 		return devlink_rate_node_get_from_info(devlink, info);
79 	else
80 		return ERR_PTR(-EINVAL);
81 }
82 
83 static int devlink_nl_rate_fill(struct sk_buff *msg,
84 				struct devlink_rate *devlink_rate,
85 				enum devlink_command cmd, u32 portid, u32 seq,
86 				int flags, struct netlink_ext_ack *extack)
87 {
88 	struct devlink *devlink = devlink_rate->devlink;
89 	void *hdr;
90 
91 	hdr = genlmsg_put(msg, portid, seq, &devlink_nl_family, flags, cmd);
92 	if (!hdr)
93 		return -EMSGSIZE;
94 
95 	if (devlink_nl_put_handle(msg, devlink))
96 		goto nla_put_failure;
97 
98 	if (nla_put_u16(msg, DEVLINK_ATTR_RATE_TYPE, devlink_rate->type))
99 		goto nla_put_failure;
100 
101 	if (devlink_rate_is_leaf(devlink_rate)) {
102 		if (nla_put_u32(msg, DEVLINK_ATTR_PORT_INDEX,
103 				devlink_rate->devlink_port->index))
104 			goto nla_put_failure;
105 	} else if (devlink_rate_is_node(devlink_rate)) {
106 		if (nla_put_string(msg, DEVLINK_ATTR_RATE_NODE_NAME,
107 				   devlink_rate->name))
108 			goto nla_put_failure;
109 	}
110 
111 	if (nla_put_u64_64bit(msg, DEVLINK_ATTR_RATE_TX_SHARE,
112 			      devlink_rate->tx_share, DEVLINK_ATTR_PAD))
113 		goto nla_put_failure;
114 
115 	if (nla_put_u64_64bit(msg, DEVLINK_ATTR_RATE_TX_MAX,
116 			      devlink_rate->tx_max, DEVLINK_ATTR_PAD))
117 		goto nla_put_failure;
118 
119 	if (nla_put_u32(msg, DEVLINK_ATTR_RATE_TX_PRIORITY,
120 			devlink_rate->tx_priority))
121 		goto nla_put_failure;
122 
123 	if (nla_put_u32(msg, DEVLINK_ATTR_RATE_TX_WEIGHT,
124 			devlink_rate->tx_weight))
125 		goto nla_put_failure;
126 
127 	if (devlink_rate->parent)
128 		if (nla_put_string(msg, DEVLINK_ATTR_RATE_PARENT_NODE_NAME,
129 				   devlink_rate->parent->name))
130 			goto nla_put_failure;
131 
132 	genlmsg_end(msg, hdr);
133 	return 0;
134 
135 nla_put_failure:
136 	genlmsg_cancel(msg, hdr);
137 	return -EMSGSIZE;
138 }
139 
140 static void devlink_rate_notify(struct devlink_rate *devlink_rate,
141 				enum devlink_command cmd)
142 {
143 	struct devlink *devlink = devlink_rate->devlink;
144 	struct sk_buff *msg;
145 	int err;
146 
147 	WARN_ON(cmd != DEVLINK_CMD_RATE_NEW && cmd != DEVLINK_CMD_RATE_DEL);
148 
149 	if (!xa_get_mark(&devlinks, devlink->index, DEVLINK_REGISTERED))
150 		return;
151 
152 	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
153 	if (!msg)
154 		return;
155 
156 	err = devlink_nl_rate_fill(msg, devlink_rate, cmd, 0, 0, 0, NULL);
157 	if (err) {
158 		nlmsg_free(msg);
159 		return;
160 	}
161 
162 	genlmsg_multicast_netns(&devlink_nl_family, devlink_net(devlink), msg,
163 				0, DEVLINK_MCGRP_CONFIG, GFP_KERNEL);
164 }
165 
166 void devlink_rates_notify_register(struct devlink *devlink)
167 {
168 	struct devlink_rate *rate_node;
169 
170 	list_for_each_entry(rate_node, &devlink->rate_list, list)
171 		devlink_rate_notify(rate_node, DEVLINK_CMD_RATE_NEW);
172 }
173 
174 void devlink_rates_notify_unregister(struct devlink *devlink)
175 {
176 	struct devlink_rate *rate_node;
177 
178 	list_for_each_entry_reverse(rate_node, &devlink->rate_list, list)
179 		devlink_rate_notify(rate_node, DEVLINK_CMD_RATE_DEL);
180 }
181 
182 static int
183 devlink_nl_rate_get_dump_one(struct sk_buff *msg, struct devlink *devlink,
184 			     struct netlink_callback *cb, int flags)
185 {
186 	struct devlink_nl_dump_state *state = devlink_dump_state(cb);
187 	struct devlink_rate *devlink_rate;
188 	int idx = 0;
189 	int err = 0;
190 
191 	list_for_each_entry(devlink_rate, &devlink->rate_list, list) {
192 		enum devlink_command cmd = DEVLINK_CMD_RATE_NEW;
193 		u32 id = NETLINK_CB(cb->skb).portid;
194 
195 		if (idx < state->idx) {
196 			idx++;
197 			continue;
198 		}
199 		err = devlink_nl_rate_fill(msg, devlink_rate, cmd, id,
200 					   cb->nlh->nlmsg_seq, flags, NULL);
201 		if (err) {
202 			state->idx = idx;
203 			break;
204 		}
205 		idx++;
206 	}
207 
208 	return err;
209 }
210 
211 int devlink_nl_rate_get_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
212 {
213 	return devlink_nl_dumpit(skb, cb, devlink_nl_rate_get_dump_one);
214 }
215 
216 int devlink_nl_rate_get_doit(struct sk_buff *skb, struct genl_info *info)
217 {
218 	struct devlink *devlink = info->user_ptr[0];
219 	struct devlink_rate *devlink_rate;
220 	struct sk_buff *msg;
221 	int err;
222 
223 	devlink_rate = devlink_rate_get_from_info(devlink, info);
224 	if (IS_ERR(devlink_rate))
225 		return PTR_ERR(devlink_rate);
226 
227 	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
228 	if (!msg)
229 		return -ENOMEM;
230 
231 	err = devlink_nl_rate_fill(msg, devlink_rate, DEVLINK_CMD_RATE_NEW,
232 				   info->snd_portid, info->snd_seq, 0,
233 				   info->extack);
234 	if (err) {
235 		nlmsg_free(msg);
236 		return err;
237 	}
238 
239 	return genlmsg_reply(msg, info);
240 }
241 
242 static bool
243 devlink_rate_is_parent_node(struct devlink_rate *devlink_rate,
244 			    struct devlink_rate *parent)
245 {
246 	while (parent) {
247 		if (parent == devlink_rate)
248 			return true;
249 		parent = parent->parent;
250 	}
251 	return false;
252 }
253 
254 static int
255 devlink_nl_rate_parent_node_set(struct devlink_rate *devlink_rate,
256 				struct genl_info *info,
257 				struct nlattr *nla_parent)
258 {
259 	struct devlink *devlink = devlink_rate->devlink;
260 	const char *parent_name = nla_data(nla_parent);
261 	const struct devlink_ops *ops = devlink->ops;
262 	size_t len = strlen(parent_name);
263 	struct devlink_rate *parent;
264 	int err = -EOPNOTSUPP;
265 
266 	parent = devlink_rate->parent;
267 
268 	if (parent && !len) {
269 		if (devlink_rate_is_leaf(devlink_rate))
270 			err = ops->rate_leaf_parent_set(devlink_rate, NULL,
271 							devlink_rate->priv, NULL,
272 							info->extack);
273 		else if (devlink_rate_is_node(devlink_rate))
274 			err = ops->rate_node_parent_set(devlink_rate, NULL,
275 							devlink_rate->priv, NULL,
276 							info->extack);
277 		if (err)
278 			return err;
279 
280 		refcount_dec(&parent->refcnt);
281 		devlink_rate->parent = NULL;
282 	} else if (len) {
283 		parent = devlink_rate_node_get_by_name(devlink, parent_name);
284 		if (IS_ERR(parent))
285 			return -ENODEV;
286 
287 		if (parent == devlink_rate) {
288 			NL_SET_ERR_MSG(info->extack, "Parent to self is not allowed");
289 			return -EINVAL;
290 		}
291 
292 		if (devlink_rate_is_node(devlink_rate) &&
293 		    devlink_rate_is_parent_node(devlink_rate, parent->parent)) {
294 			NL_SET_ERR_MSG(info->extack, "Node is already a parent of parent node.");
295 			return -EEXIST;
296 		}
297 
298 		if (devlink_rate_is_leaf(devlink_rate))
299 			err = ops->rate_leaf_parent_set(devlink_rate, parent,
300 							devlink_rate->priv, parent->priv,
301 							info->extack);
302 		else if (devlink_rate_is_node(devlink_rate))
303 			err = ops->rate_node_parent_set(devlink_rate, parent,
304 							devlink_rate->priv, parent->priv,
305 							info->extack);
306 		if (err)
307 			return err;
308 
309 		if (devlink_rate->parent)
310 			/* we're reassigning to other parent in this case */
311 			refcount_dec(&devlink_rate->parent->refcnt);
312 
313 		refcount_inc(&parent->refcnt);
314 		devlink_rate->parent = parent;
315 	}
316 
317 	return 0;
318 }
319 
320 static int devlink_nl_rate_set(struct devlink_rate *devlink_rate,
321 			       const struct devlink_ops *ops,
322 			       struct genl_info *info)
323 {
324 	struct nlattr *nla_parent, **attrs = info->attrs;
325 	int err = -EOPNOTSUPP;
326 	u32 priority;
327 	u32 weight;
328 	u64 rate;
329 
330 	if (attrs[DEVLINK_ATTR_RATE_TX_SHARE]) {
331 		rate = nla_get_u64(attrs[DEVLINK_ATTR_RATE_TX_SHARE]);
332 		if (devlink_rate_is_leaf(devlink_rate))
333 			err = ops->rate_leaf_tx_share_set(devlink_rate, devlink_rate->priv,
334 							  rate, info->extack);
335 		else if (devlink_rate_is_node(devlink_rate))
336 			err = ops->rate_node_tx_share_set(devlink_rate, devlink_rate->priv,
337 							  rate, info->extack);
338 		if (err)
339 			return err;
340 		devlink_rate->tx_share = rate;
341 	}
342 
343 	if (attrs[DEVLINK_ATTR_RATE_TX_MAX]) {
344 		rate = nla_get_u64(attrs[DEVLINK_ATTR_RATE_TX_MAX]);
345 		if (devlink_rate_is_leaf(devlink_rate))
346 			err = ops->rate_leaf_tx_max_set(devlink_rate, devlink_rate->priv,
347 							rate, info->extack);
348 		else if (devlink_rate_is_node(devlink_rate))
349 			err = ops->rate_node_tx_max_set(devlink_rate, devlink_rate->priv,
350 							rate, info->extack);
351 		if (err)
352 			return err;
353 		devlink_rate->tx_max = rate;
354 	}
355 
356 	if (attrs[DEVLINK_ATTR_RATE_TX_PRIORITY]) {
357 		priority = nla_get_u32(attrs[DEVLINK_ATTR_RATE_TX_PRIORITY]);
358 		if (devlink_rate_is_leaf(devlink_rate))
359 			err = ops->rate_leaf_tx_priority_set(devlink_rate, devlink_rate->priv,
360 							     priority, info->extack);
361 		else if (devlink_rate_is_node(devlink_rate))
362 			err = ops->rate_node_tx_priority_set(devlink_rate, devlink_rate->priv,
363 							     priority, info->extack);
364 
365 		if (err)
366 			return err;
367 		devlink_rate->tx_priority = priority;
368 	}
369 
370 	if (attrs[DEVLINK_ATTR_RATE_TX_WEIGHT]) {
371 		weight = nla_get_u32(attrs[DEVLINK_ATTR_RATE_TX_WEIGHT]);
372 		if (devlink_rate_is_leaf(devlink_rate))
373 			err = ops->rate_leaf_tx_weight_set(devlink_rate, devlink_rate->priv,
374 							   weight, info->extack);
375 		else if (devlink_rate_is_node(devlink_rate))
376 			err = ops->rate_node_tx_weight_set(devlink_rate, devlink_rate->priv,
377 							   weight, info->extack);
378 
379 		if (err)
380 			return err;
381 		devlink_rate->tx_weight = weight;
382 	}
383 
384 	nla_parent = attrs[DEVLINK_ATTR_RATE_PARENT_NODE_NAME];
385 	if (nla_parent) {
386 		err = devlink_nl_rate_parent_node_set(devlink_rate, info,
387 						      nla_parent);
388 		if (err)
389 			return err;
390 	}
391 
392 	return 0;
393 }
394 
395 static bool devlink_rate_set_ops_supported(const struct devlink_ops *ops,
396 					   struct genl_info *info,
397 					   enum devlink_rate_type type)
398 {
399 	struct nlattr **attrs = info->attrs;
400 
401 	if (type == DEVLINK_RATE_TYPE_LEAF) {
402 		if (attrs[DEVLINK_ATTR_RATE_TX_SHARE] && !ops->rate_leaf_tx_share_set) {
403 			NL_SET_ERR_MSG(info->extack, "TX share set isn't supported for the leafs");
404 			return false;
405 		}
406 		if (attrs[DEVLINK_ATTR_RATE_TX_MAX] && !ops->rate_leaf_tx_max_set) {
407 			NL_SET_ERR_MSG(info->extack, "TX max set isn't supported for the leafs");
408 			return false;
409 		}
410 		if (attrs[DEVLINK_ATTR_RATE_PARENT_NODE_NAME] &&
411 		    !ops->rate_leaf_parent_set) {
412 			NL_SET_ERR_MSG(info->extack, "Parent set isn't supported for the leafs");
413 			return false;
414 		}
415 		if (attrs[DEVLINK_ATTR_RATE_TX_PRIORITY] && !ops->rate_leaf_tx_priority_set) {
416 			NL_SET_ERR_MSG_ATTR(info->extack,
417 					    attrs[DEVLINK_ATTR_RATE_TX_PRIORITY],
418 					    "TX priority set isn't supported for the leafs");
419 			return false;
420 		}
421 		if (attrs[DEVLINK_ATTR_RATE_TX_WEIGHT] && !ops->rate_leaf_tx_weight_set) {
422 			NL_SET_ERR_MSG_ATTR(info->extack,
423 					    attrs[DEVLINK_ATTR_RATE_TX_WEIGHT],
424 					    "TX weight set isn't supported for the leafs");
425 			return false;
426 		}
427 	} else if (type == DEVLINK_RATE_TYPE_NODE) {
428 		if (attrs[DEVLINK_ATTR_RATE_TX_SHARE] && !ops->rate_node_tx_share_set) {
429 			NL_SET_ERR_MSG(info->extack, "TX share set isn't supported for the nodes");
430 			return false;
431 		}
432 		if (attrs[DEVLINK_ATTR_RATE_TX_MAX] && !ops->rate_node_tx_max_set) {
433 			NL_SET_ERR_MSG(info->extack, "TX max set isn't supported for the nodes");
434 			return false;
435 		}
436 		if (attrs[DEVLINK_ATTR_RATE_PARENT_NODE_NAME] &&
437 		    !ops->rate_node_parent_set) {
438 			NL_SET_ERR_MSG(info->extack, "Parent set isn't supported for the nodes");
439 			return false;
440 		}
441 		if (attrs[DEVLINK_ATTR_RATE_TX_PRIORITY] && !ops->rate_node_tx_priority_set) {
442 			NL_SET_ERR_MSG_ATTR(info->extack,
443 					    attrs[DEVLINK_ATTR_RATE_TX_PRIORITY],
444 					    "TX priority set isn't supported for the nodes");
445 			return false;
446 		}
447 		if (attrs[DEVLINK_ATTR_RATE_TX_WEIGHT] && !ops->rate_node_tx_weight_set) {
448 			NL_SET_ERR_MSG_ATTR(info->extack,
449 					    attrs[DEVLINK_ATTR_RATE_TX_WEIGHT],
450 					    "TX weight set isn't supported for the nodes");
451 			return false;
452 		}
453 	} else {
454 		WARN(1, "Unknown type of rate object");
455 		return false;
456 	}
457 
458 	return true;
459 }
460 
461 int devlink_nl_cmd_rate_set_doit(struct sk_buff *skb, struct genl_info *info)
462 {
463 	struct devlink *devlink = info->user_ptr[0];
464 	struct devlink_rate *devlink_rate;
465 	const struct devlink_ops *ops;
466 	int err;
467 
468 	devlink_rate = devlink_rate_get_from_info(devlink, info);
469 	if (IS_ERR(devlink_rate))
470 		return PTR_ERR(devlink_rate);
471 
472 	ops = devlink->ops;
473 	if (!ops || !devlink_rate_set_ops_supported(ops, info, devlink_rate->type))
474 		return -EOPNOTSUPP;
475 
476 	err = devlink_nl_rate_set(devlink_rate, ops, info);
477 
478 	if (!err)
479 		devlink_rate_notify(devlink_rate, DEVLINK_CMD_RATE_NEW);
480 	return err;
481 }
482 
483 int devlink_nl_cmd_rate_new_doit(struct sk_buff *skb, struct genl_info *info)
484 {
485 	struct devlink *devlink = info->user_ptr[0];
486 	struct devlink_rate *rate_node;
487 	const struct devlink_ops *ops;
488 	int err;
489 
490 	ops = devlink->ops;
491 	if (!ops || !ops->rate_node_new || !ops->rate_node_del) {
492 		NL_SET_ERR_MSG(info->extack, "Rate nodes aren't supported");
493 		return -EOPNOTSUPP;
494 	}
495 
496 	if (!devlink_rate_set_ops_supported(ops, info, DEVLINK_RATE_TYPE_NODE))
497 		return -EOPNOTSUPP;
498 
499 	rate_node = devlink_rate_node_get_from_attrs(devlink, info->attrs);
500 	if (!IS_ERR(rate_node))
501 		return -EEXIST;
502 	else if (rate_node == ERR_PTR(-EINVAL))
503 		return -EINVAL;
504 
505 	rate_node = kzalloc(sizeof(*rate_node), GFP_KERNEL);
506 	if (!rate_node)
507 		return -ENOMEM;
508 
509 	rate_node->devlink = devlink;
510 	rate_node->type = DEVLINK_RATE_TYPE_NODE;
511 	rate_node->name = nla_strdup(info->attrs[DEVLINK_ATTR_RATE_NODE_NAME], GFP_KERNEL);
512 	if (!rate_node->name) {
513 		err = -ENOMEM;
514 		goto err_strdup;
515 	}
516 
517 	err = ops->rate_node_new(rate_node, &rate_node->priv, info->extack);
518 	if (err)
519 		goto err_node_new;
520 
521 	err = devlink_nl_rate_set(rate_node, ops, info);
522 	if (err)
523 		goto err_rate_set;
524 
525 	refcount_set(&rate_node->refcnt, 1);
526 	list_add(&rate_node->list, &devlink->rate_list);
527 	devlink_rate_notify(rate_node, DEVLINK_CMD_RATE_NEW);
528 	return 0;
529 
530 err_rate_set:
531 	ops->rate_node_del(rate_node, rate_node->priv, info->extack);
532 err_node_new:
533 	kfree(rate_node->name);
534 err_strdup:
535 	kfree(rate_node);
536 	return err;
537 }
538 
539 int devlink_nl_cmd_rate_del_doit(struct sk_buff *skb, struct genl_info *info)
540 {
541 	struct devlink *devlink = info->user_ptr[0];
542 	struct devlink_rate *rate_node;
543 	int err;
544 
545 	rate_node = devlink_rate_node_get_from_info(devlink, info);
546 	if (IS_ERR(rate_node))
547 		return PTR_ERR(rate_node);
548 
549 	if (refcount_read(&rate_node->refcnt) > 1) {
550 		NL_SET_ERR_MSG(info->extack, "Node has children. Cannot delete node.");
551 		return -EBUSY;
552 	}
553 
554 	devlink_rate_notify(rate_node, DEVLINK_CMD_RATE_DEL);
555 	err = devlink->ops->rate_node_del(rate_node, rate_node->priv,
556 					  info->extack);
557 	if (rate_node->parent)
558 		refcount_dec(&rate_node->parent->refcnt);
559 	list_del(&rate_node->list);
560 	kfree(rate_node->name);
561 	kfree(rate_node);
562 	return err;
563 }
564 
565 int devlink_rate_nodes_check(struct devlink *devlink, u16 mode,
566 			     struct netlink_ext_ack *extack)
567 {
568 	struct devlink_rate *devlink_rate;
569 
570 	list_for_each_entry(devlink_rate, &devlink->rate_list, list)
571 		if (devlink_rate_is_node(devlink_rate)) {
572 			NL_SET_ERR_MSG(extack, "Rate node(s) exists.");
573 			return -EBUSY;
574 		}
575 	return 0;
576 }
577 
578 /**
579  * devl_rate_node_create - create devlink rate node
580  * @devlink: devlink instance
581  * @priv: driver private data
582  * @node_name: name of the resulting node
583  * @parent: parent devlink_rate struct
584  *
585  * Create devlink rate object of type node
586  */
587 struct devlink_rate *
588 devl_rate_node_create(struct devlink *devlink, void *priv, char *node_name,
589 		      struct devlink_rate *parent)
590 {
591 	struct devlink_rate *rate_node;
592 
593 	rate_node = devlink_rate_node_get_by_name(devlink, node_name);
594 	if (!IS_ERR(rate_node))
595 		return ERR_PTR(-EEXIST);
596 
597 	rate_node = kzalloc(sizeof(*rate_node), GFP_KERNEL);
598 	if (!rate_node)
599 		return ERR_PTR(-ENOMEM);
600 
601 	if (parent) {
602 		rate_node->parent = parent;
603 		refcount_inc(&rate_node->parent->refcnt);
604 	}
605 
606 	rate_node->type = DEVLINK_RATE_TYPE_NODE;
607 	rate_node->devlink = devlink;
608 	rate_node->priv = priv;
609 
610 	rate_node->name = kstrdup(node_name, GFP_KERNEL);
611 	if (!rate_node->name) {
612 		kfree(rate_node);
613 		return ERR_PTR(-ENOMEM);
614 	}
615 
616 	refcount_set(&rate_node->refcnt, 1);
617 	list_add(&rate_node->list, &devlink->rate_list);
618 	devlink_rate_notify(rate_node, DEVLINK_CMD_RATE_NEW);
619 	return rate_node;
620 }
621 EXPORT_SYMBOL_GPL(devl_rate_node_create);
622 
623 /**
624  * devl_rate_leaf_create - create devlink rate leaf
625  * @devlink_port: devlink port object to create rate object on
626  * @priv: driver private data
627  * @parent: parent devlink_rate struct
628  *
629  * Create devlink rate object of type leaf on provided @devlink_port.
630  */
631 int devl_rate_leaf_create(struct devlink_port *devlink_port, void *priv,
632 			  struct devlink_rate *parent)
633 {
634 	struct devlink *devlink = devlink_port->devlink;
635 	struct devlink_rate *devlink_rate;
636 
637 	devl_assert_locked(devlink_port->devlink);
638 
639 	if (WARN_ON(devlink_port->devlink_rate))
640 		return -EBUSY;
641 
642 	devlink_rate = kzalloc(sizeof(*devlink_rate), GFP_KERNEL);
643 	if (!devlink_rate)
644 		return -ENOMEM;
645 
646 	if (parent) {
647 		devlink_rate->parent = parent;
648 		refcount_inc(&devlink_rate->parent->refcnt);
649 	}
650 
651 	devlink_rate->type = DEVLINK_RATE_TYPE_LEAF;
652 	devlink_rate->devlink = devlink;
653 	devlink_rate->devlink_port = devlink_port;
654 	devlink_rate->priv = priv;
655 	list_add_tail(&devlink_rate->list, &devlink->rate_list);
656 	devlink_port->devlink_rate = devlink_rate;
657 	devlink_rate_notify(devlink_rate, DEVLINK_CMD_RATE_NEW);
658 
659 	return 0;
660 }
661 EXPORT_SYMBOL_GPL(devl_rate_leaf_create);
662 
663 /**
664  * devl_rate_leaf_destroy - destroy devlink rate leaf
665  *
666  * @devlink_port: devlink port linked to the rate object
667  *
668  * Destroy the devlink rate object of type leaf on provided @devlink_port.
669  */
670 void devl_rate_leaf_destroy(struct devlink_port *devlink_port)
671 {
672 	struct devlink_rate *devlink_rate = devlink_port->devlink_rate;
673 
674 	devl_assert_locked(devlink_port->devlink);
675 	if (!devlink_rate)
676 		return;
677 
678 	devlink_rate_notify(devlink_rate, DEVLINK_CMD_RATE_DEL);
679 	if (devlink_rate->parent)
680 		refcount_dec(&devlink_rate->parent->refcnt);
681 	list_del(&devlink_rate->list);
682 	devlink_port->devlink_rate = NULL;
683 	kfree(devlink_rate);
684 }
685 EXPORT_SYMBOL_GPL(devl_rate_leaf_destroy);
686 
687 /**
688  * devl_rate_nodes_destroy - destroy all devlink rate nodes on device
689  * @devlink: devlink instance
690  *
691  * Unset parent for all rate objects and destroy all rate nodes
692  * on specified device.
693  */
694 void devl_rate_nodes_destroy(struct devlink *devlink)
695 {
696 	static struct devlink_rate *devlink_rate, *tmp;
697 	const struct devlink_ops *ops = devlink->ops;
698 
699 	devl_assert_locked(devlink);
700 
701 	list_for_each_entry(devlink_rate, &devlink->rate_list, list) {
702 		if (!devlink_rate->parent)
703 			continue;
704 
705 		refcount_dec(&devlink_rate->parent->refcnt);
706 		if (devlink_rate_is_leaf(devlink_rate))
707 			ops->rate_leaf_parent_set(devlink_rate, NULL, devlink_rate->priv,
708 						  NULL, NULL);
709 		else if (devlink_rate_is_node(devlink_rate))
710 			ops->rate_node_parent_set(devlink_rate, NULL, devlink_rate->priv,
711 						  NULL, NULL);
712 	}
713 	list_for_each_entry_safe(devlink_rate, tmp, &devlink->rate_list, list) {
714 		if (devlink_rate_is_node(devlink_rate)) {
715 			ops->rate_node_del(devlink_rate, devlink_rate->priv, NULL);
716 			list_del(&devlink_rate->list);
717 			kfree(devlink_rate->name);
718 			kfree(devlink_rate);
719 		}
720 	}
721 }
722 EXPORT_SYMBOL_GPL(devl_rate_nodes_destroy);
723