net/devlink/linecard.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * Copyright (c) 2016 Mellanox Technologies. All rights reserved.
  * Copyright (c) 2016 Jiri Pirko <jiri@mellanox.com>
  */

 #include "devl_internal.h"

 struct devlink_linecard {
 	struct list_head list;
 	struct devlink *devlink;
 	unsigned int index;
 	const struct devlink_linecard_ops *ops;
 	void *priv;
 	enum devlink_linecard_state state;
 	struct mutex state_lock; /* Protects state */
 	const char *type;
 	struct devlink_linecard_type *types;
 	unsigned int types_count;
 	u32 rel_index;
 };

 unsigned int devlink_linecard_index(struct devlink_linecard *linecard)
 {
 	return linecard->index;
 }

 static struct devlink_linecard *
 devlink_linecard_get_by_index(struct devlink *devlink,
 			      unsigned int linecard_index)
 {
 	struct devlink_linecard *devlink_linecard;

 	list_for_each_entry(devlink_linecard, &devlink->linecard_list, list) {
 		if (devlink_linecard->index == linecard_index)
 			return devlink_linecard;
 	}
 	return NULL;
 }

 static bool devlink_linecard_index_exists(struct devlink *devlink,
 					  unsigned int linecard_index)
 {
 	return devlink_linecard_get_by_index(devlink, linecard_index);
 }

 static struct devlink_linecard *
 devlink_linecard_get_from_attrs(struct devlink *devlink, struct nlattr **attrs)
 {
 	if (attrs[DEVLINK_ATTR_LINECARD_INDEX]) {
 		u32 linecard_index = nla_get_u32(attrs[DEVLINK_ATTR_LINECARD_INDEX]);
 		struct devlink_linecard *linecard;

 		linecard = devlink_linecard_get_by_index(devlink, linecard_index);
 		if (!linecard)
 			return ERR_PTR(-ENODEV);
 		return linecard;
 	}
 	return ERR_PTR(-EINVAL);
 }

 static struct devlink_linecard *
 devlink_linecard_get_from_info(struct devlink *devlink, struct genl_info *info)
 {
 	return devlink_linecard_get_from_attrs(devlink, info->attrs);
 }

 struct devlink_linecard_type {
 	const char *type;
 	const void *priv;
 };

 static int devlink_nl_linecard_fill(struct sk_buff *msg,
 				    struct devlink *devlink,
 				    struct devlink_linecard *linecard,
 				    enum devlink_command cmd, u32 portid,
 				    u32 seq, int flags,
 				    struct netlink_ext_ack *extack)
 {
 	struct devlink_linecard_type *linecard_type;
 	struct nlattr *attr;
 	void *hdr;
 	int i;

 	hdr = genlmsg_put(msg, portid, seq, &devlink_nl_family, flags, cmd);
 	if (!hdr)
 		return -EMSGSIZE;

 	if (devlink_nl_put_handle(msg, devlink))
 		goto nla_put_failure;
 	if (nla_put_u32(msg, DEVLINK_ATTR_LINECARD_INDEX, linecard->index))
 		goto nla_put_failure;
 	if (nla_put_u8(msg, DEVLINK_ATTR_LINECARD_STATE, linecard->state))
 		goto nla_put_failure;
 	if (linecard->type &&
 	    nla_put_string(msg, DEVLINK_ATTR_LINECARD_TYPE, linecard->type))
 		goto nla_put_failure;

 	if (linecard->types_count) {
 		attr = nla_nest_start(msg,
 				      DEVLINK_ATTR_LINECARD_SUPPORTED_TYPES);
 		if (!attr)
 			goto nla_put_failure;
 		for (i = 0; i < linecard->types_count; i++) {
 			linecard_type = &linecard->types[i];
 			if (nla_put_string(msg, DEVLINK_ATTR_LINECARD_TYPE,
 					   linecard_type->type)) {
 				nla_nest_cancel(msg, attr);
 				goto nla_put_failure;
 			}
 		}
 		nla_nest_end(msg, attr);
 	}

 	if (devlink_rel_devlink_handle_put(msg, devlink,
 					   linecard->rel_index,
 					   DEVLINK_ATTR_NESTED_DEVLINK,
 					   NULL))
 		goto nla_put_failure;

 	genlmsg_end(msg, hdr);
 	return 0;

 nla_put_failure:
 	genlmsg_cancel(msg, hdr);
 	return -EMSGSIZE;
 }

 static void devlink_linecard_notify(struct devlink_linecard *linecard,
 				    enum devlink_command cmd)
 {
 	struct devlink *devlink = linecard->devlink;
 	struct sk_buff *msg;
 	int err;

 	WARN_ON(cmd != DEVLINK_CMD_LINECARD_NEW &&
 		cmd != DEVLINK_CMD_LINECARD_DEL);

 	if (!xa_get_mark(&devlinks, devlink->index, DEVLINK_REGISTERED))
 		return;

 	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 	if (!msg)
 		return;

 	err = devlink_nl_linecard_fill(msg, devlink, linecard, cmd, 0, 0, 0,
 				       NULL);
 	if (err) {
 		nlmsg_free(msg);
 		return;
 	}

 	genlmsg_multicast_netns(&devlink_nl_family, devlink_net(devlink),
 				msg, 0, DEVLINK_MCGRP_CONFIG, GFP_KERNEL);
 }

 void devlink_linecards_notify_register(struct devlink *devlink)
 {
 	struct devlink_linecard *linecard;

 	list_for_each_entry(linecard, &devlink->linecard_list, list)
 		devlink_linecard_notify(linecard, DEVLINK_CMD_LINECARD_NEW);
 }

 void devlink_linecards_notify_unregister(struct devlink *devlink)
 {
 	struct devlink_linecard *linecard;

 	list_for_each_entry_reverse(linecard, &devlink->linecard_list, list)
 		devlink_linecard_notify(linecard, DEVLINK_CMD_LINECARD_DEL);
 }

 int devlink_nl_linecard_get_doit(struct sk_buff *skb, struct genl_info *info)
 {
 	struct devlink *devlink = info->user_ptr[0];
 	struct devlink_linecard *linecard;
 	struct sk_buff *msg;
 	int err;

 	linecard = devlink_linecard_get_from_info(devlink, info);
 	if (IS_ERR(linecard))
 		return PTR_ERR(linecard);

 	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 	if (!msg)
 		return -ENOMEM;

 	mutex_lock(&linecard->state_lock);
 	err = devlink_nl_linecard_fill(msg, devlink, linecard,
 				       DEVLINK_CMD_LINECARD_NEW,
 				       info->snd_portid, info->snd_seq, 0,
 				       info->extack);
 	mutex_unlock(&linecard->state_lock);
 	if (err) {
 		nlmsg_free(msg);
 		return err;
 	}

 	return genlmsg_reply(msg, info);
 }

 static int devlink_nl_linecard_get_dump_one(struct sk_buff *msg,
 					    struct devlink *devlink,
 					    struct netlink_callback *cb,
 					    int flags)
 {
 	struct devlink_nl_dump_state *state = devlink_dump_state(cb);
 	struct devlink_linecard *linecard;
 	int idx = 0;
 	int err = 0;

 	list_for_each_entry(linecard, &devlink->linecard_list, list) {
 		if (idx < state->idx) {
 			idx++;
 			continue;
 		}
 		mutex_lock(&linecard->state_lock);
 		err = devlink_nl_linecard_fill(msg, devlink, linecard,
 					       DEVLINK_CMD_LINECARD_NEW,
 					       NETLINK_CB(cb->skb).portid,
 					       cb->nlh->nlmsg_seq, flags,
 					       cb->extack);
 		mutex_unlock(&linecard->state_lock);
 		if (err) {
 			state->idx = idx;
 			break;
 		}
 		idx++;
 	}

 	return err;
 }

 int devlink_nl_linecard_get_dumpit(struct sk_buff *skb,
 				   struct netlink_callback *cb)
 {
 	return devlink_nl_dumpit(skb, cb, devlink_nl_linecard_get_dump_one);
 }

 static struct devlink_linecard_type *
 devlink_linecard_type_lookup(struct devlink_linecard *linecard,
 			     const char *type)
 {
 	struct devlink_linecard_type *linecard_type;
 	int i;

 	for (i = 0; i < linecard->types_count; i++) {
 		linecard_type = &linecard->types[i];
 		if (!strcmp(type, linecard_type->type))
 			return linecard_type;
 	}
 	return NULL;
 }

 static int devlink_linecard_type_set(struct devlink_linecard *linecard,
 				     const char *type,
 				     struct netlink_ext_ack *extack)
 {
 	const struct devlink_linecard_ops *ops = linecard->ops;
 	struct devlink_linecard_type *linecard_type;
 	int err;

 	mutex_lock(&linecard->state_lock);
 	if (linecard->state == DEVLINK_LINECARD_STATE_PROVISIONING) {
 		NL_SET_ERR_MSG(extack, "Line card is currently being provisioned");
 		err = -EBUSY;
 		goto out;
 	}
 	if (linecard->state == DEVLINK_LINECARD_STATE_UNPROVISIONING) {
 		NL_SET_ERR_MSG(extack, "Line card is currently being unprovisioned");
 		err = -EBUSY;
 		goto out;
 	}

 	linecard_type = devlink_linecard_type_lookup(linecard, type);
 	if (!linecard_type) {
 		NL_SET_ERR_MSG(extack, "Unsupported line card type provided");
 		err = -EINVAL;
 		goto out;
 	}

 	if (linecard->state != DEVLINK_LINECARD_STATE_UNPROVISIONED &&
 	    linecard->state != DEVLINK_LINECARD_STATE_PROVISIONING_FAILED) {
 		NL_SET_ERR_MSG(extack, "Line card already provisioned");
 		err = -EBUSY;
 		/* Check if the line card is provisioned in the same
 		 * way the user asks. In case it is, make the operation
 		 * to return success.
 		 */
 		if (ops->same_provision &&
 		    ops->same_provision(linecard, linecard->priv,
 					linecard_type->type,
 					linecard_type->priv))
 			err = 0;
 		goto out;
 	}

 	linecard->state = DEVLINK_LINECARD_STATE_PROVISIONING;
 	linecard->type = linecard_type->type;
 	devlink_linecard_notify(linecard, DEVLINK_CMD_LINECARD_NEW);
 	mutex_unlock(&linecard->state_lock);
 	err = ops->provision(linecard, linecard->priv, linecard_type->type,
 			     linecard_type->priv, extack);
 	if (err) {
 		/* Provisioning failed. Assume the linecard is unprovisioned
 		 * for future operations.
 		 */
 		mutex_lock(&linecard->state_lock);
 		linecard->state = DEVLINK_LINECARD_STATE_UNPROVISIONED;
 		linecard->type = NULL;
 		devlink_linecard_notify(linecard, DEVLINK_CMD_LINECARD_NEW);
 		mutex_unlock(&linecard->state_lock);
 	}
 	return err;

 out:
 	mutex_unlock(&linecard->state_lock);
 	return err;
 }

 static int devlink_linecard_type_unset(struct devlink_linecard *linecard,
 				       struct netlink_ext_ack *extack)
 {
 	int err;

 	mutex_lock(&linecard->state_lock);
 	if (linecard->state == DEVLINK_LINECARD_STATE_PROVISIONING) {
 		NL_SET_ERR_MSG(extack, "Line card is currently being provisioned");
 		err = -EBUSY;
 		goto out;
 	}
 	if (linecard->state == DEVLINK_LINECARD_STATE_UNPROVISIONING) {
 		NL_SET_ERR_MSG(extack, "Line card is currently being unprovisioned");
 		err = -EBUSY;
 		goto out;
 	}
 	if (linecard->state == DEVLINK_LINECARD_STATE_PROVISIONING_FAILED) {
 		linecard->state = DEVLINK_LINECARD_STATE_UNPROVISIONED;
 		linecard->type = NULL;
 		devlink_linecard_notify(linecard, DEVLINK_CMD_LINECARD_NEW);
 		err = 0;
 		goto out;
 	}

 	if (linecard->state == DEVLINK_LINECARD_STATE_UNPROVISIONED) {
 		NL_SET_ERR_MSG(extack, "Line card is not provisioned");
 		err = 0;
 		goto out;
 	}
 	linecard->state = DEVLINK_LINECARD_STATE_UNPROVISIONING;
 	devlink_linecard_notify(linecard, DEVLINK_CMD_LINECARD_NEW);
 	mutex_unlock(&linecard->state_lock);
 	err = linecard->ops->unprovision(linecard, linecard->priv,
 					 extack);
 	if (err) {
 		/* Unprovisioning failed. Assume the linecard is unprovisioned
 		 * for future operations.
 		 */
 		mutex_lock(&linecard->state_lock);
 		linecard->state = DEVLINK_LINECARD_STATE_UNPROVISIONED;
 		linecard->type = NULL;
 		devlink_linecard_notify(linecard, DEVLINK_CMD_LINECARD_NEW);
 		mutex_unlock(&linecard->state_lock);
 	}
 	return err;

 out:
 	mutex_unlock(&linecard->state_lock);
 	return err;
 }

 int devlink_nl_linecard_set_doit(struct sk_buff *skb, struct genl_info *info)
 {
 	struct netlink_ext_ack *extack = info->extack;
 	struct devlink *devlink = info->user_ptr[0];
 	struct devlink_linecard *linecard;
 	int err;

 	linecard = devlink_linecard_get_from_info(devlink, info);
 	if (IS_ERR(linecard))
 		return PTR_ERR(linecard);

 	if (info->attrs[DEVLINK_ATTR_LINECARD_TYPE]) {
 		const char *type;

 		type = nla_data(info->attrs[DEVLINK_ATTR_LINECARD_TYPE]);
 		if (strcmp(type, "")) {
 			err = devlink_linecard_type_set(linecard, type, extack);
 			if (err)
 				return err;
 		} else {
 			err = devlink_linecard_type_unset(linecard, extack);
 			if (err)
 				return err;
 		}
 	}

 	return 0;
 }

 static int devlink_linecard_types_init(struct devlink_linecard *linecard)
 {
 	struct devlink_linecard_type *linecard_type;
 	unsigned int count;
 	int i;

 	count = linecard->ops->types_count(linecard, linecard->priv);
 	linecard->types = kmalloc_array(count, sizeof(*linecard_type),
 					GFP_KERNEL);
 	if (!linecard->types)
 		return -ENOMEM;
 	linecard->types_count = count;

 	for (i = 0; i < count; i++) {
 		linecard_type = &linecard->types[i];
 		linecard->ops->types_get(linecard, linecard->priv, i,
 					 &linecard_type->type,
 					 &linecard_type->priv);
 	}
 	return 0;
 }

 static void devlink_linecard_types_fini(struct devlink_linecard *linecard)
 {
 	kfree(linecard->types);
 }

 /**
  *	devl_linecard_create - Create devlink linecard
  *
  *	@devlink: devlink
  *	@linecard_index: driver-specific numerical identifier of the linecard
  *	@ops: linecards ops
  *	@priv: user priv pointer
  *
  *	Create devlink linecard instance with provided linecard index.
  *	Caller can use any indexing, even hw-related one.
  *
  *	Return: Line card structure or an ERR_PTR() encoded error code.
  */
 struct devlink_linecard *
 devl_linecard_create(struct devlink *devlink, unsigned int linecard_index,
 		     const struct devlink_linecard_ops *ops, void *priv)
 {
 	struct devlink_linecard *linecard;
 	int err;

 	if (WARN_ON(!ops || !ops->provision || !ops->unprovision ||
 		    !ops->types_count || !ops->types_get))
 		return ERR_PTR(-EINVAL);

 	if (devlink_linecard_index_exists(devlink, linecard_index))
 		return ERR_PTR(-EEXIST);

 	linecard = kzalloc(sizeof(*linecard), GFP_KERNEL);
 	if (!linecard)
 		return ERR_PTR(-ENOMEM);

 	linecard->devlink = devlink;
 	linecard->index = linecard_index;
 	linecard->ops = ops;
 	linecard->priv = priv;
 	linecard->state = DEVLINK_LINECARD_STATE_UNPROVISIONED;
 	mutex_init(&linecard->state_lock);

 	err = devlink_linecard_types_init(linecard);
 	if (err) {
 		mutex_destroy(&linecard->state_lock);
 		kfree(linecard);
 		return ERR_PTR(err);
 	}

 	list_add_tail(&linecard->list, &devlink->linecard_list);
 	devlink_linecard_notify(linecard, DEVLINK_CMD_LINECARD_NEW);
 	return linecard;
 }
 EXPORT_SYMBOL_GPL(devl_linecard_create);

 /**
  *	devl_linecard_destroy - Destroy devlink linecard
  *
  *	@linecard: devlink linecard
  */
 void devl_linecard_destroy(struct devlink_linecard *linecard)
 {
 	devlink_linecard_notify(linecard, DEVLINK_CMD_LINECARD_DEL);
 	list_del(&linecard->list);
 	devlink_linecard_types_fini(linecard);
 	mutex_destroy(&linecard->state_lock);
 	kfree(linecard);
 }
 EXPORT_SYMBOL_GPL(devl_linecard_destroy);

 /**
  *	devlink_linecard_provision_set - Set provisioning on linecard
  *
  *	@linecard: devlink linecard
  *	@type: linecard type
  *
  *	This is either called directly from the provision() op call or
  *	as a result of the provision() op call asynchronously.
  */
 void devlink_linecard_provision_set(struct devlink_linecard *linecard,
 				    const char *type)
 {
 	mutex_lock(&linecard->state_lock);
 	WARN_ON(linecard->type && strcmp(linecard->type, type));
 	linecard->state = DEVLINK_LINECARD_STATE_PROVISIONED;
 	linecard->type = type;
 	devlink_linecard_notify(linecard, DEVLINK_CMD_LINECARD_NEW);
 	mutex_unlock(&linecard->state_lock);
 }
 EXPORT_SYMBOL_GPL(devlink_linecard_provision_set);

 /**
  *	devlink_linecard_provision_clear - Clear provisioning on linecard
  *
  *	@linecard: devlink linecard
  *
  *	This is either called directly from the unprovision() op call or
  *	as a result of the unprovision() op call asynchronously.
  */
 void devlink_linecard_provision_clear(struct devlink_linecard *linecard)
 {
 	mutex_lock(&linecard->state_lock);
 	linecard->state = DEVLINK_LINECARD_STATE_UNPROVISIONED;
 	linecard->type = NULL;
 	devlink_linecard_notify(linecard, DEVLINK_CMD_LINECARD_NEW);
 	mutex_unlock(&linecard->state_lock);
 }
 EXPORT_SYMBOL_GPL(devlink_linecard_provision_clear);

 /**
  *	devlink_linecard_provision_fail - Fail provisioning on linecard
  *
  *	@linecard: devlink linecard
  *
  *	This is either called directly from the provision() op call or
  *	as a result of the provision() op call asynchronously.
  */
 void devlink_linecard_provision_fail(struct devlink_linecard *linecard)
 {
 	mutex_lock(&linecard->state_lock);
 	linecard->state = DEVLINK_LINECARD_STATE_PROVISIONING_FAILED;
 	devlink_linecard_notify(linecard, DEVLINK_CMD_LINECARD_NEW);
 	mutex_unlock(&linecard->state_lock);
 }
 EXPORT_SYMBOL_GPL(devlink_linecard_provision_fail);

 /**
  *	devlink_linecard_activate - Set linecard active
  *
  *	@linecard: devlink linecard
  */
 void devlink_linecard_activate(struct devlink_linecard *linecard)
 {
 	mutex_lock(&linecard->state_lock);
 	WARN_ON(linecard->state != DEVLINK_LINECARD_STATE_PROVISIONED);
 	linecard->state = DEVLINK_LINECARD_STATE_ACTIVE;
 	devlink_linecard_notify(linecard, DEVLINK_CMD_LINECARD_NEW);
 	mutex_unlock(&linecard->state_lock);
 }
 EXPORT_SYMBOL_GPL(devlink_linecard_activate);

 /**
  *	devlink_linecard_deactivate - Set linecard inactive
  *
  *	@linecard: devlink linecard
  */
 void devlink_linecard_deactivate(struct devlink_linecard *linecard)
 {
 	mutex_lock(&linecard->state_lock);
 	switch (linecard->state) {
 	case DEVLINK_LINECARD_STATE_ACTIVE:
 		linecard->state = DEVLINK_LINECARD_STATE_PROVISIONED;
 		devlink_linecard_notify(linecard, DEVLINK_CMD_LINECARD_NEW);
 		break;
 	case DEVLINK_LINECARD_STATE_UNPROVISIONING:
 		/* Line card is being deactivated as part
 		 * of unprovisioning flow.
 		 */
 		break;
 	default:
 		WARN_ON(1);
 		break;
 	}
 	mutex_unlock(&linecard->state_lock);
 }
 EXPORT_SYMBOL_GPL(devlink_linecard_deactivate);

 static void devlink_linecard_rel_notify_cb(struct devlink *devlink,
 					   u32 linecard_index)
 {
 	struct devlink_linecard *linecard;

 	linecard = devlink_linecard_get_by_index(devlink, linecard_index);
 	if (!linecard)
 		return;
 	devlink_linecard_notify(linecard, DEVLINK_CMD_LINECARD_NEW);
 }

 static void devlink_linecard_rel_cleanup_cb(struct devlink *devlink,
 					    u32 linecard_index, u32 rel_index)
 {
 	struct devlink_linecard *linecard;

 	linecard = devlink_linecard_get_by_index(devlink, linecard_index);
 	if (linecard && linecard->rel_index == rel_index)
 		linecard->rel_index = 0;
 }

 /**
  *	devlink_linecard_nested_dl_set - Attach/detach nested devlink
  *					 instance to linecard.
  *
  *	@linecard: devlink linecard
  *	@nested_devlink: devlink instance to attach or NULL to detach
  */
 int devlink_linecard_nested_dl_set(struct devlink_linecard *linecard,
 				   struct devlink *nested_devlink)
 {
 	return devlink_rel_nested_in_add(&linecard->rel_index,
 					 linecard->devlink->index,
 					 linecard->index,
 					 devlink_linecard_rel_notify_cb,
 					 devlink_linecard_rel_cleanup_cb,
 					 nested_devlink);
 }
 EXPORT_SYMBOL_GPL(devlink_linecard_nested_dl_set);
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* Copyright (c) 2016 Mellanox Technologies. All rights reserved.
	* Copyright (c) 2016 Jiri Pirko <jiri@mellanox.com>
	*/

	#include "devl_internal.h"

	struct devlink_linecard {
	struct list_head list;
	struct devlink *devlink;
	unsigned int index;
	const struct devlink_linecard_ops *ops;
	void *priv;
	enum devlink_linecard_state state;
	struct mutex state_lock; /* Protects state */
	const char *type;
	struct devlink_linecard_type *types;
	unsigned int types_count;
	u32 rel_index;
	};

	unsigned int devlink_linecard_index(struct devlink_linecard *linecard)
	{
	return linecard->index;
	}

	static struct devlink_linecard *
	devlink_linecard_get_by_index(struct devlink *devlink,
	unsigned int linecard_index)
	{
	struct devlink_linecard *devlink_linecard;

	list_for_each_entry(devlink_linecard, &devlink->linecard_list, list) {
	if (devlink_linecard->index == linecard_index)
	return devlink_linecard;
	}
	return NULL;
	}

	static bool devlink_linecard_index_exists(struct devlink *devlink,
	unsigned int linecard_index)
	{
	return devlink_linecard_get_by_index(devlink, linecard_index);
	}

	static struct devlink_linecard *
	devlink_linecard_get_from_attrs(struct devlink devlink, struct nlattr *attrs)
	{
	if (attrs[DEVLINK_ATTR_LINECARD_INDEX]) {
	u32 linecard_index = nla_get_u32(attrs[DEVLINK_ATTR_LINECARD_INDEX]);
	struct devlink_linecard *linecard;

	linecard = devlink_linecard_get_by_index(devlink, linecard_index);
	if (!linecard)
	return ERR_PTR(-ENODEV);
	return linecard;
	}
	return ERR_PTR(-EINVAL);
	}

	static struct devlink_linecard *
	devlink_linecard_get_from_info(struct devlink devlink, struct genl_info info)
	{
	return devlink_linecard_get_from_attrs(devlink, info->attrs);
	}

	struct devlink_linecard_type {
	const char *type;
	const void *priv;
	};

	static int devlink_nl_linecard_fill(struct sk_buff *msg,
	struct devlink *devlink,
	struct devlink_linecard *linecard,
	enum devlink_command cmd, u32 portid,
	u32 seq, int flags,
	struct netlink_ext_ack *extack)
	{
	struct devlink_linecard_type *linecard_type;
	struct nlattr *attr;
	void *hdr;
	int i;

	hdr = genlmsg_put(msg, portid, seq, &devlink_nl_family, flags, cmd);
	if (!hdr)
	return -EMSGSIZE;

	if (devlink_nl_put_handle(msg, devlink))
	goto nla_put_failure;
	if (nla_put_u32(msg, DEVLINK_ATTR_LINECARD_INDEX, linecard->index))
	goto nla_put_failure;
	if (nla_put_u8(msg, DEVLINK_ATTR_LINECARD_STATE, linecard->state))
	goto nla_put_failure;
	if (linecard->type &&
	nla_put_string(msg, DEVLINK_ATTR_LINECARD_TYPE, linecard->type))
	goto nla_put_failure;

	if (linecard->types_count) {
	attr = nla_nest_start(msg,
	DEVLINK_ATTR_LINECARD_SUPPORTED_TYPES);
	if (!attr)
	goto nla_put_failure;
	for (i = 0; i < linecard->types_count; i++) {
	linecard_type = &linecard->types[i];
	if (nla_put_string(msg, DEVLINK_ATTR_LINECARD_TYPE,
	linecard_type->type)) {
	nla_nest_cancel(msg, attr);
	goto nla_put_failure;
	}
	}
	nla_nest_end(msg, attr);
	}

	if (devlink_rel_devlink_handle_put(msg, devlink,
	linecard->rel_index,
	DEVLINK_ATTR_NESTED_DEVLINK,
	NULL))
	goto nla_put_failure;

	genlmsg_end(msg, hdr);
	return 0;

	nla_put_failure:
	genlmsg_cancel(msg, hdr);
	return -EMSGSIZE;
	}

	static void devlink_linecard_notify(struct devlink_linecard *linecard,
	enum devlink_command cmd)
	{
	struct devlink *devlink = linecard->devlink;
	struct sk_buff *msg;
	int err;

	WARN_ON(cmd != DEVLINK_CMD_LINECARD_NEW &&
	cmd != DEVLINK_CMD_LINECARD_DEL);

	if (!xa_get_mark(&devlinks, devlink->index, DEVLINK_REGISTERED))
	return;

	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
	if (!msg)
	return;

	err = devlink_nl_linecard_fill(msg, devlink, linecard, cmd, 0, 0, 0,
	NULL);
	if (err) {
	nlmsg_free(msg);
	return;
	}

	genlmsg_multicast_netns(&devlink_nl_family, devlink_net(devlink),
	msg, 0, DEVLINK_MCGRP_CONFIG, GFP_KERNEL);
	}

	void devlink_linecards_notify_register(struct devlink *devlink)
	{
	struct devlink_linecard *linecard;

	list_for_each_entry(linecard, &devlink->linecard_list, list)
	devlink_linecard_notify(linecard, DEVLINK_CMD_LINECARD_NEW);
	}

	void devlink_linecards_notify_unregister(struct devlink *devlink)
	{
	struct devlink_linecard *linecard;

	list_for_each_entry_reverse(linecard, &devlink->linecard_list, list)
	devlink_linecard_notify(linecard, DEVLINK_CMD_LINECARD_DEL);
	}

	int devlink_nl_linecard_get_doit(struct sk_buff skb, struct genl_info info)
	{
	struct devlink *devlink = info->user_ptr[0];
	struct devlink_linecard *linecard;
	struct sk_buff *msg;
	int err;

	linecard = devlink_linecard_get_from_info(devlink, info);
	if (IS_ERR(linecard))
	return PTR_ERR(linecard);

	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
	if (!msg)
	return -ENOMEM;

	mutex_lock(&linecard->state_lock);
	err = devlink_nl_linecard_fill(msg, devlink, linecard,
	DEVLINK_CMD_LINECARD_NEW,
	info->snd_portid, info->snd_seq, 0,
	info->extack);
	mutex_unlock(&linecard->state_lock);
	if (err) {
	nlmsg_free(msg);
	return err;
	}

	return genlmsg_reply(msg, info);
	}

	static int devlink_nl_linecard_get_dump_one(struct sk_buff *msg,
	struct devlink *devlink,
	struct netlink_callback *cb,
	int flags)
	{
	struct devlink_nl_dump_state *state = devlink_dump_state(cb);
	struct devlink_linecard *linecard;
	int idx = 0;
	int err = 0;

	list_for_each_entry(linecard, &devlink->linecard_list, list) {
	if (idx < state->idx) {
	idx++;
	continue;
	}
	mutex_lock(&linecard->state_lock);
	err = devlink_nl_linecard_fill(msg, devlink, linecard,
	DEVLINK_CMD_LINECARD_NEW,
	NETLINK_CB(cb->skb).portid,
	cb->nlh->nlmsg_seq, flags,
	cb->extack);
	mutex_unlock(&linecard->state_lock);
	if (err) {
	state->idx = idx;
	break;
	}
	idx++;
	}

	return err;
	}

	int devlink_nl_linecard_get_dumpit(struct sk_buff *skb,
	struct netlink_callback *cb)
	{
	return devlink_nl_dumpit(skb, cb, devlink_nl_linecard_get_dump_one);
	}

	static struct devlink_linecard_type *
	devlink_linecard_type_lookup(struct devlink_linecard *linecard,
	const char *type)
	{
	struct devlink_linecard_type *linecard_type;
	int i;

	for (i = 0; i < linecard->types_count; i++) {
	linecard_type = &linecard->types[i];
	if (!strcmp(type, linecard_type->type))
	return linecard_type;
	}
	return NULL;
	}

	static int devlink_linecard_type_set(struct devlink_linecard *linecard,
	const char *type,
	struct netlink_ext_ack *extack)
	{
	const struct devlink_linecard_ops *ops = linecard->ops;
	struct devlink_linecard_type *linecard_type;
	int err;

	mutex_lock(&linecard->state_lock);
	if (linecard->state == DEVLINK_LINECARD_STATE_PROVISIONING) {
	NL_SET_ERR_MSG(extack, "Line card is currently being provisioned");
	err = -EBUSY;
	goto out;
	}
	if (linecard->state == DEVLINK_LINECARD_STATE_UNPROVISIONING) {
	NL_SET_ERR_MSG(extack, "Line card is currently being unprovisioned");
	err = -EBUSY;
	goto out;
	}

	linecard_type = devlink_linecard_type_lookup(linecard, type);
	if (!linecard_type) {
	NL_SET_ERR_MSG(extack, "Unsupported line card type provided");
	err = -EINVAL;
	goto out;
	}

	if (linecard->state != DEVLINK_LINECARD_STATE_UNPROVISIONED &&
	linecard->state != DEVLINK_LINECARD_STATE_PROVISIONING_FAILED) {
	NL_SET_ERR_MSG(extack, "Line card already provisioned");
	err = -EBUSY;
	/* Check if the line card is provisioned in the same
	* way the user asks. In case it is, make the operation
	* to return success.
	*/
	if (ops->same_provision &&
	ops->same_provision(linecard, linecard->priv,
	linecard_type->type,
	linecard_type->priv))
	err = 0;
	goto out;
	}

	linecard->state = DEVLINK_LINECARD_STATE_PROVISIONING;
	linecard->type = linecard_type->type;
	devlink_linecard_notify(linecard, DEVLINK_CMD_LINECARD_NEW);
	mutex_unlock(&linecard->state_lock);
	err = ops->provision(linecard, linecard->priv, linecard_type->type,
	linecard_type->priv, extack);
	if (err) {
	/* Provisioning failed. Assume the linecard is unprovisioned
	* for future operations.
	*/
	mutex_lock(&linecard->state_lock);
	linecard->state = DEVLINK_LINECARD_STATE_UNPROVISIONED;
	linecard->type = NULL;
	devlink_linecard_notify(linecard, DEVLINK_CMD_LINECARD_NEW);
	mutex_unlock(&linecard->state_lock);
	}
	return err;

	out:
	mutex_unlock(&linecard->state_lock);
	return err;
	}

	static int devlink_linecard_type_unset(struct devlink_linecard *linecard,
	struct netlink_ext_ack *extack)
	{
	int err;

	mutex_lock(&linecard->state_lock);
	if (linecard->state == DEVLINK_LINECARD_STATE_PROVISIONING) {
	NL_SET_ERR_MSG(extack, "Line card is currently being provisioned");
	err = -EBUSY;
	goto out;
	}
	if (linecard->state == DEVLINK_LINECARD_STATE_UNPROVISIONING) {
	NL_SET_ERR_MSG(extack, "Line card is currently being unprovisioned");
	err = -EBUSY;
	goto out;
	}
	if (linecard->state == DEVLINK_LINECARD_STATE_PROVISIONING_FAILED) {
	linecard->state = DEVLINK_LINECARD_STATE_UNPROVISIONED;
	linecard->type = NULL;
	devlink_linecard_notify(linecard, DEVLINK_CMD_LINECARD_NEW);
	err = 0;
	goto out;
	}

	if (linecard->state == DEVLINK_LINECARD_STATE_UNPROVISIONED) {
	NL_SET_ERR_MSG(extack, "Line card is not provisioned");
	err = 0;
	goto out;
	}
	linecard->state = DEVLINK_LINECARD_STATE_UNPROVISIONING;
	devlink_linecard_notify(linecard, DEVLINK_CMD_LINECARD_NEW);
	mutex_unlock(&linecard->state_lock);
	err = linecard->ops->unprovision(linecard, linecard->priv,
	extack);
	if (err) {
	/* Unprovisioning failed. Assume the linecard is unprovisioned
	* for future operations.
	*/
	mutex_lock(&linecard->state_lock);
	linecard->state = DEVLINK_LINECARD_STATE_UNPROVISIONED;
	linecard->type = NULL;
	devlink_linecard_notify(linecard, DEVLINK_CMD_LINECARD_NEW);
	mutex_unlock(&linecard->state_lock);
	}
	return err;

	out:
	mutex_unlock(&linecard->state_lock);
	return err;
	}

	int devlink_nl_linecard_set_doit(struct sk_buff skb, struct genl_info info)
	{
	struct netlink_ext_ack *extack = info->extack;
	struct devlink *devlink = info->user_ptr[0];
	struct devlink_linecard *linecard;
	int err;

	linecard = devlink_linecard_get_from_info(devlink, info);
	if (IS_ERR(linecard))
	return PTR_ERR(linecard);

	if (info->attrs[DEVLINK_ATTR_LINECARD_TYPE]) {
	const char *type;

	type = nla_data(info->attrs[DEVLINK_ATTR_LINECARD_TYPE]);
	if (strcmp(type, "")) {
	err = devlink_linecard_type_set(linecard, type, extack);
	if (err)
	return err;
	} else {
	err = devlink_linecard_type_unset(linecard, extack);
	if (err)
	return err;
	}
	}

	return 0;
	}

	static int devlink_linecard_types_init(struct devlink_linecard *linecard)
	{
	struct devlink_linecard_type *linecard_type;
	unsigned int count;
	int i;

	count = linecard->ops->types_count(linecard, linecard->priv);
	linecard->types = kmalloc_array(count, sizeof(*linecard_type),
	GFP_KERNEL);
	if (!linecard->types)
	return -ENOMEM;
	linecard->types_count = count;

	for (i = 0; i < count; i++) {
	linecard_type = &linecard->types[i];
	linecard->ops->types_get(linecard, linecard->priv, i,
	&linecard_type->type,
	&linecard_type->priv);
	}
	return 0;
	}

	static void devlink_linecard_types_fini(struct devlink_linecard *linecard)
	{
	kfree(linecard->types);
	}

	/**
	* devl_linecard_create - Create devlink linecard
	*
	* @devlink: devlink
	* @linecard_index: driver-specific numerical identifier of the linecard
	* @ops: linecards ops
	* @priv: user priv pointer
	*
	* Create devlink linecard instance with provided linecard index.
	* Caller can use any indexing, even hw-related one.
	*
	* Return: Line card structure or an ERR_PTR() encoded error code.
	*/
	struct devlink_linecard *
	devl_linecard_create(struct devlink *devlink, unsigned int linecard_index,
	const struct devlink_linecard_ops ops, void priv)
	{
	struct devlink_linecard *linecard;
	int err;

	if (WARN_ON(!ops \|\| !ops->provision \|\| !ops->unprovision \|\|
	!ops->types_count \|\| !ops->types_get))
	return ERR_PTR(-EINVAL);

	if (devlink_linecard_index_exists(devlink, linecard_index))
	return ERR_PTR(-EEXIST);

	linecard = kzalloc(sizeof(*linecard), GFP_KERNEL);
	if (!linecard)
	return ERR_PTR(-ENOMEM);

	linecard->devlink = devlink;
	linecard->index = linecard_index;
	linecard->ops = ops;
	linecard->priv = priv;
	linecard->state = DEVLINK_LINECARD_STATE_UNPROVISIONED;
	mutex_init(&linecard->state_lock);

	err = devlink_linecard_types_init(linecard);
	if (err) {
	mutex_destroy(&linecard->state_lock);
	kfree(linecard);
	return ERR_PTR(err);
	}

	list_add_tail(&linecard->list, &devlink->linecard_list);
	devlink_linecard_notify(linecard, DEVLINK_CMD_LINECARD_NEW);
	return linecard;
	}
	EXPORT_SYMBOL_GPL(devl_linecard_create);

	/**
	* devl_linecard_destroy - Destroy devlink linecard
	*
	* @linecard: devlink linecard
	*/
	void devl_linecard_destroy(struct devlink_linecard *linecard)
	{
	devlink_linecard_notify(linecard, DEVLINK_CMD_LINECARD_DEL);
	list_del(&linecard->list);
	devlink_linecard_types_fini(linecard);
	mutex_destroy(&linecard->state_lock);
	kfree(linecard);
	}
	EXPORT_SYMBOL_GPL(devl_linecard_destroy);

	/**
	* devlink_linecard_provision_set - Set provisioning on linecard
	*
	* @linecard: devlink linecard
	* @type: linecard type
	*
	* This is either called directly from the provision() op call or
	* as a result of the provision() op call asynchronously.
	*/
	void devlink_linecard_provision_set(struct devlink_linecard *linecard,
	const char *type)
	{
	mutex_lock(&linecard->state_lock);
	WARN_ON(linecard->type && strcmp(linecard->type, type));
	linecard->state = DEVLINK_LINECARD_STATE_PROVISIONED;
	linecard->type = type;
	devlink_linecard_notify(linecard, DEVLINK_CMD_LINECARD_NEW);
	mutex_unlock(&linecard->state_lock);
	}
	EXPORT_SYMBOL_GPL(devlink_linecard_provision_set);

	/**
	* devlink_linecard_provision_clear - Clear provisioning on linecard
	*
	* @linecard: devlink linecard
	*
	* This is either called directly from the unprovision() op call or
	* as a result of the unprovision() op call asynchronously.
	*/
	void devlink_linecard_provision_clear(struct devlink_linecard *linecard)
	{
	mutex_lock(&linecard->state_lock);
	linecard->state = DEVLINK_LINECARD_STATE_UNPROVISIONED;
	linecard->type = NULL;
	devlink_linecard_notify(linecard, DEVLINK_CMD_LINECARD_NEW);
	mutex_unlock(&linecard->state_lock);
	}
	EXPORT_SYMBOL_GPL(devlink_linecard_provision_clear);

	/**
	* devlink_linecard_provision_fail - Fail provisioning on linecard
	*
	* @linecard: devlink linecard
	*
	* This is either called directly from the provision() op call or
	* as a result of the provision() op call asynchronously.
	*/
	void devlink_linecard_provision_fail(struct devlink_linecard *linecard)
	{
	mutex_lock(&linecard->state_lock);
	linecard->state = DEVLINK_LINECARD_STATE_PROVISIONING_FAILED;
	devlink_linecard_notify(linecard, DEVLINK_CMD_LINECARD_NEW);
	mutex_unlock(&linecard->state_lock);
	}
	EXPORT_SYMBOL_GPL(devlink_linecard_provision_fail);

	/**
	* devlink_linecard_activate - Set linecard active
	*
	* @linecard: devlink linecard
	*/
	void devlink_linecard_activate(struct devlink_linecard *linecard)
	{
	mutex_lock(&linecard->state_lock);
	WARN_ON(linecard->state != DEVLINK_LINECARD_STATE_PROVISIONED);
	linecard->state = DEVLINK_LINECARD_STATE_ACTIVE;
	devlink_linecard_notify(linecard, DEVLINK_CMD_LINECARD_NEW);
	mutex_unlock(&linecard->state_lock);
	}
	EXPORT_SYMBOL_GPL(devlink_linecard_activate);

	/**
	* devlink_linecard_deactivate - Set linecard inactive
	*
	* @linecard: devlink linecard
	*/
	void devlink_linecard_deactivate(struct devlink_linecard *linecard)
	{
	mutex_lock(&linecard->state_lock);
	switch (linecard->state) {
	case DEVLINK_LINECARD_STATE_ACTIVE:
	linecard->state = DEVLINK_LINECARD_STATE_PROVISIONED;
	devlink_linecard_notify(linecard, DEVLINK_CMD_LINECARD_NEW);
	break;
	case DEVLINK_LINECARD_STATE_UNPROVISIONING:
	/* Line card is being deactivated as part
	* of unprovisioning flow.
	*/
	break;
	default:
	WARN_ON(1);
	break;
	}
	mutex_unlock(&linecard->state_lock);
	}
	EXPORT_SYMBOL_GPL(devlink_linecard_deactivate);

	static void devlink_linecard_rel_notify_cb(struct devlink *devlink,
	u32 linecard_index)
	{
	struct devlink_linecard *linecard;

	linecard = devlink_linecard_get_by_index(devlink, linecard_index);
	if (!linecard)
	return;
	devlink_linecard_notify(linecard, DEVLINK_CMD_LINECARD_NEW);
	}

	static void devlink_linecard_rel_cleanup_cb(struct devlink *devlink,
	u32 linecard_index, u32 rel_index)
	{
	struct devlink_linecard *linecard;

	linecard = devlink_linecard_get_by_index(devlink, linecard_index);
	if (linecard && linecard->rel_index == rel_index)
	linecard->rel_index = 0;
	}

	/**
	* devlink_linecard_nested_dl_set - Attach/detach nested devlink
	* instance to linecard.
	*
	* @linecard: devlink linecard
	* @nested_devlink: devlink instance to attach or NULL to detach
	*/
	int devlink_linecard_nested_dl_set(struct devlink_linecard *linecard,
	struct devlink *nested_devlink)
	{
	return devlink_rel_nested_in_add(&linecard->rel_index,
	linecard->devlink->index,
	linecard->index,
	devlink_linecard_rel_notify_cb,
	devlink_linecard_rel_cleanup_cb,
	nested_devlink);
	}
	EXPORT_SYMBOL_GPL(devlink_linecard_nested_dl_set);