[deliverable/linux.git] / drivers / infiniband / core / cma_configfs.c

/*
 * Copyright (c) 2015, Mellanox Technologies inc.  All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <linux/module.h>
#include <linux/configfs.h>
#include <rdma/ib_verbs.h>
#include "core_priv.h"

struct cma_device;

struct cma_dev_group;

struct cma_dev_port_group {
	unsigned int		port_num;
	struct cma_dev_group	*cma_dev_group;
	struct config_group	group;
};

struct cma_dev_group {
	char				name[IB_DEVICE_NAME_MAX];
	struct config_group		device_group;
	struct config_group		ports_group;
	struct cma_dev_port_group	*ports;
};

static struct cma_dev_port_group *to_dev_port_group(struct config_item *item)
{
	struct config_group *group;

	if (!item)
		return NULL;

	group = container_of(item, struct config_group, cg_item);
	return container_of(group, struct cma_dev_port_group, group);
}

static bool filter_by_name(struct ib_device *ib_dev, void *cookie)
{
	return !strcmp(ib_dev->name, cookie);
}

static int cma_configfs_params_get(struct config_item *item,
				   struct cma_device **pcma_dev,
				   struct cma_dev_port_group **pgroup)
{
	struct cma_dev_port_group *group = to_dev_port_group(item);
	struct cma_device *cma_dev;

	if (!group)
		return -ENODEV;

	cma_dev = cma_enum_devices_by_ibdev(filter_by_name,
					    group->cma_dev_group->name);
	if (!cma_dev)
		return -ENODEV;

	*pcma_dev = cma_dev;
	*pgroup = group;

	return 0;
}

static void cma_configfs_params_put(struct cma_device *cma_dev)
{
	cma_deref_dev(cma_dev);
}

static ssize_t default_roce_mode_show(struct config_item *item,
				      char *buf)
{
	struct cma_device *cma_dev;
	struct cma_dev_port_group *group;
	int gid_type;
	ssize_t ret;

	ret = cma_configfs_params_get(item, &cma_dev, &group);
	if (ret)
		return ret;

	gid_type = cma_get_default_gid_type(cma_dev, group->port_num);
	cma_configfs_params_put(cma_dev);

	if (gid_type < 0)
		return gid_type;

	return sprintf(buf, "%s\n", ib_cache_gid_type_str(gid_type));
}

static ssize_t default_roce_mode_store(struct config_item *item,
				       const char *buf, size_t count)
{
	struct cma_device *cma_dev;
	struct cma_dev_port_group *group;
	int gid_type = ib_cache_gid_parse_type_str(buf);
	ssize_t ret;

	if (gid_type < 0)
		return -EINVAL;

	ret = cma_configfs_params_get(item, &cma_dev, &group);
	if (ret)
		return ret;

	ret = cma_set_default_gid_type(cma_dev, group->port_num, gid_type);

	cma_configfs_params_put(cma_dev);

	return !ret ? strnlen(buf, count) : ret;
}

CONFIGFS_ATTR(, default_roce_mode);

static struct configfs_attribute *cma_configfs_attributes[] = {
	&attr_default_roce_mode,
	NULL,
};

static struct config_item_type cma_port_group_type = {
	.ct_attrs	= cma_configfs_attributes,
	.ct_owner	= THIS_MODULE
};

static int make_cma_ports(struct cma_dev_group *cma_dev_group,
			  struct cma_device *cma_dev)
{
	struct ib_device *ibdev;
	unsigned int i;
	unsigned int ports_num;
	struct cma_dev_port_group *ports;
	int err;

	ibdev = cma_get_ib_dev(cma_dev);

	if (!ibdev)
		return -ENODEV;

	ports_num = ibdev->phys_port_cnt;
	ports = kcalloc(ports_num, sizeof(*cma_dev_group->ports),
			GFP_KERNEL);

	if (!ports) {
		err = -ENOMEM;
		goto free;
	}

	for (i = 0; i < ports_num; i++) {
		char port_str[10];

		ports[i].port_num = i + 1;
		snprintf(port_str, sizeof(port_str), "%u", i + 1);
		ports[i].cma_dev_group = cma_dev_group;
		config_group_init_type_name(&ports[i].group,
					    port_str,
					    &cma_port_group_type);
		configfs_add_default_group(&ports[i].group,
				&cma_dev_group->ports_group);

	}
	cma_dev_group->ports = ports;

	return 0;
free:
	kfree(ports);
	cma_dev_group->ports = NULL;
	return err;
}

static void release_cma_dev(struct config_item  *item)
{
	struct config_group *group = container_of(item, struct config_group,
						  cg_item);
	struct cma_dev_group *cma_dev_group = container_of(group,
							   struct cma_dev_group,
							   device_group);

	kfree(cma_dev_group);
};

static void release_cma_ports_group(struct config_item  *item)
{
	struct config_group *group = container_of(item, struct config_group,
						  cg_item);
	struct cma_dev_group *cma_dev_group = container_of(group,
							   struct cma_dev_group,
							   ports_group);

	kfree(cma_dev_group->ports);
	cma_dev_group->ports = NULL;
};

static struct configfs_item_operations cma_ports_item_ops = {
	.release = release_cma_ports_group
};

static struct config_item_type cma_ports_group_type = {
	.ct_item_ops	= &cma_ports_item_ops,
	.ct_owner	= THIS_MODULE
};

static struct configfs_item_operations cma_device_item_ops = {
	.release = release_cma_dev
};

static struct config_item_type cma_device_group_type = {
	.ct_item_ops	= &cma_device_item_ops,
	.ct_owner	= THIS_MODULE
};

static struct config_group *make_cma_dev(struct config_group *group,
					 const char *name)
{
	int err = -ENODEV;
	struct cma_device *cma_dev = cma_enum_devices_by_ibdev(filter_by_name,
							       (void *)name);
	struct cma_dev_group *cma_dev_group = NULL;

	if (!cma_dev)
		goto fail;

	cma_dev_group = kzalloc(sizeof(*cma_dev_group), GFP_KERNEL);

	if (!cma_dev_group) {
		err = -ENOMEM;
		goto fail;
	}

	strncpy(cma_dev_group->name, name, sizeof(cma_dev_group->name));

	config_group_init_type_name(&cma_dev_group->ports_group, "ports",
				    &cma_ports_group_type);

	err = make_cma_ports(cma_dev_group, cma_dev);
	if (err)
		goto fail;

	config_group_init_type_name(&cma_dev_group->device_group, name,
				    &cma_device_group_type);
	configfs_add_default_group(&cma_dev_group->ports_group,
			&cma_dev_group->device_group);

	cma_deref_dev(cma_dev);
	return &cma_dev_group->device_group;

fail:
	if (cma_dev)
		cma_deref_dev(cma_dev);
	kfree(cma_dev_group);
	return ERR_PTR(err);
}

static struct configfs_group_operations cma_subsys_group_ops = {
	.make_group	= make_cma_dev,
};

static struct config_item_type cma_subsys_type = {
	.ct_group_ops	= &cma_subsys_group_ops,
	.ct_owner	= THIS_MODULE,
};

static struct configfs_subsystem cma_subsys = {
	.su_group	= {
		.cg_item	= {
			.ci_namebuf	= "rdma_cm",
			.ci_type	= &cma_subsys_type,
		},
	},
};

int __init cma_configfs_init(void)
{
	config_group_init(&cma_subsys.su_group);
	mutex_init(&cma_subsys.su_mutex);
	return configfs_register_subsystem(&cma_subsys);
}

void __exit cma_configfs_exit(void)
{
	configfs_unregister_subsystem(&cma_subsys);
}
Commit	Line	Data
045959db MB	1	/*
	2	* Copyright (c) 2015, Mellanox Technologies inc. All rights reserved.
	3	*
	4	* This software is available to you under a choice of one of two
	5	* licenses. You may choose to be licensed under the terms of the GNU
	6	* General Public License (GPL) Version 2, available from the file
	7	* COPYING in the main directory of this source tree, or the
	8	* OpenIB.org BSD license below:
	9	*
	10	* Redistribution and use in source and binary forms, with or
	11	* without modification, are permitted provided that the following
	12	* conditions are met:
	13	*
	14	* - Redistributions of source code must retain the above
	15	* copyright notice, this list of conditions and the following
	16	* disclaimer.
	17	*
	18	* - Redistributions in binary form must reproduce the above
	19	* copyright notice, this list of conditions and the following
	20	* disclaimer in the documentation and/or other materials
	21	* provided with the distribution.
	22	*
	23	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	24	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	25	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
	26	* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
	27	* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
	28	* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
	29	* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	30	* SOFTWARE.
	31	*/
	32
	33	#include <linux/module.h>
	34	#include <linux/configfs.h>
	35	#include <rdma/ib_verbs.h>
	36	#include "core_priv.h"
	37
	38	struct cma_device;
	39
	40	struct cma_dev_group;
	41
	42	struct cma_dev_port_group {
	43	unsigned int port_num;
	44	struct cma_dev_group *cma_dev_group;
	45	struct config_group group;
	46	};
	47
	48	struct cma_dev_group {
	49	char name[IB_DEVICE_NAME_MAX];
	50	struct config_group device_group;
	51	struct config_group ports_group;
045959db MB	52	struct cma_dev_port_group *ports;
	53	};
	54
	55	static struct cma_dev_port_group to_dev_port_group(struct config_item item)
	56	{
	57	struct config_group *group;
	58
	59	if (!item)
	60	return NULL;
	61
	62	group = container_of(item, struct config_group, cg_item);
	63	return container_of(group, struct cma_dev_port_group, group);
	64	}
	65
	66	static bool filter_by_name(struct ib_device ib_dev, void cookie)
	67	{
	68	return !strcmp(ib_dev->name, cookie);
	69	}
	70
	71	static int cma_configfs_params_get(struct config_item *item,
	72	struct cma_device **pcma_dev,
	73	struct cma_dev_port_group **pgroup)
	74	{
	75	struct cma_dev_port_group *group = to_dev_port_group(item);
	76	struct cma_device *cma_dev;
	77
	78	if (!group)
	79	return -ENODEV;
	80
	81	cma_dev = cma_enum_devices_by_ibdev(filter_by_name,
	82	group->cma_dev_group->name);
	83	if (!cma_dev)
	84	return -ENODEV;
	85
	86	*pcma_dev = cma_dev;
	87	*pgroup = group;
	88
	89	return 0;
	90	}
	91
	92	static void cma_configfs_params_put(struct cma_device *cma_dev)
	93	{
	94	cma_deref_dev(cma_dev);
	95	}
	96
	97	static ssize_t default_roce_mode_show(struct config_item *item,
	98	char *buf)
	99	{
	100	struct cma_device *cma_dev;
	101	struct cma_dev_port_group *group;
	102	int gid_type;
	103	ssize_t ret;
	104
	105	ret = cma_configfs_params_get(item, &cma_dev, &group);
	106	if (ret)
	107	return ret;
	108
	109	gid_type = cma_get_default_gid_type(cma_dev, group->port_num);
	110	cma_configfs_params_put(cma_dev);
	111
	112	if (gid_type < 0)
	113	return gid_type;
	114
	115	return sprintf(buf, "%s\n", ib_cache_gid_type_str(gid_type));
116	}
117
118	static ssize_t default_roce_mode_store(struct config_item *item,
119	const char *buf, size_t count)
120	{
121	struct cma_device *cma_dev;
122	struct cma_dev_port_group *group;
123	int gid_type = ib_cache_gid_parse_type_str(buf);
124	ssize_t ret;
125
126	if (gid_type < 0)
127	return -EINVAL;
128
129	ret = cma_configfs_params_get(item, &cma_dev, &group);
130	if (ret)
131	return ret;
132
133	ret = cma_set_default_gid_type(cma_dev, group->port_num, gid_type);
134
135	cma_configfs_params_put(cma_dev);
136
137	return !ret ? strnlen(buf, count) : ret;
138	}
139
140	CONFIGFS_ATTR(, default_roce_mode);
141
142	static struct configfs_attribute *cma_configfs_attributes[] = {
143	&attr_default_roce_mode,
144	NULL,
145	};
146
147	static struct config_item_type cma_port_group_type = {
148	.ct_attrs = cma_configfs_attributes,
149	.ct_owner = THIS_MODULE
150	};
151
152	static int make_cma_ports(struct cma_dev_group *cma_dev_group,
153	struct cma_device *cma_dev)
154	{
155	struct ib_device *ibdev;
156	unsigned int i;
157	unsigned int ports_num;
158	struct cma_dev_port_group *ports;
159	int err;
160
161	ibdev = cma_get_ib_dev(cma_dev);
162
163	if (!ibdev)
164	return -ENODEV;
165
166	ports_num = ibdev->phys_port_cnt;
167	ports = kcalloc(ports_num, sizeof(*cma_dev_group->ports),
168	GFP_KERNEL);
169
1ae1602d	170	if (!ports) {
045959db MB	171	err = -ENOMEM;
	172	goto free;
	173	}
	174
	175	for (i = 0; i < ports_num; i++) {
	176	char port_str[10];
	177
	178	ports[i].port_num = i + 1;
	179	snprintf(port_str, sizeof(port_str), "%u", i + 1);
	180	ports[i].cma_dev_group = cma_dev_group;
	181	config_group_init_type_name(&ports[i].group,
	182	port_str,
	183	&cma_port_group_type);
1ae1602d CH	184	configfs_add_default_group(&ports[i].group,
	185	&cma_dev_group->ports_group);
	186
045959db	187	}
045959db MB	188	cma_dev_group->ports = ports;
	189
	190	return 0;
	191	free:
	192	kfree(ports);
045959db	193	cma_dev_group->ports = NULL;
045959db MB	194	return err;
	195	}
	196
	197	static void release_cma_dev(struct config_item *item)
	198	{
	199	struct config_group *group = container_of(item, struct config_group,
	200	cg_item);
	201	struct cma_dev_group *cma_dev_group = container_of(group,
	202	struct cma_dev_group,
	203	device_group);
	204
	205	kfree(cma_dev_group);
	206	};
	207
	208	static void release_cma_ports_group(struct config_item *item)
	209	{
	210	struct config_group *group = container_of(item, struct config_group,
	211	cg_item);
	212	struct cma_dev_group *cma_dev_group = container_of(group,
	213	struct cma_dev_group,
	214	ports_group);
	215
	216	kfree(cma_dev_group->ports);
045959db	217	cma_dev_group->ports = NULL;
045959db MB	218	};
	219
	220	static struct configfs_item_operations cma_ports_item_ops = {
	221	.release = release_cma_ports_group
	222	};
	223
	224	static struct config_item_type cma_ports_group_type = {
	225	.ct_item_ops = &cma_ports_item_ops,
	226	.ct_owner = THIS_MODULE
	227	};
	228
	229	static struct configfs_item_operations cma_device_item_ops = {
	230	.release = release_cma_dev
	231	};
	232
	233	static struct config_item_type cma_device_group_type = {
	234	.ct_item_ops = &cma_device_item_ops,
	235	.ct_owner = THIS_MODULE
	236	};
	237
	238	static struct config_group make_cma_dev(struct config_group group,
	239	const char *name)
	240	{
	241	int err = -ENODEV;
	242	struct cma_device *cma_dev = cma_enum_devices_by_ibdev(filter_by_name,
	243	(void *)name);
	244	struct cma_dev_group *cma_dev_group = NULL;
	245
	246	if (!cma_dev)
	247	goto fail;
	248
	249	cma_dev_group = kzalloc(sizeof(*cma_dev_group), GFP_KERNEL);
	250
	251	if (!cma_dev_group) {
	252	err = -ENOMEM;
	253	goto fail;
	254	}
	255
	256	strncpy(cma_dev_group->name, name, sizeof(cma_dev_group->name));
	257
045959db MB	258	config_group_init_type_name(&cma_dev_group->ports_group, "ports",
	259	&cma_ports_group_type);
	260
1ae1602d CH	261	err = make_cma_ports(cma_dev_group, cma_dev);
	262	if (err)
	263	goto fail;
045959db MB	264
	265	config_group_init_type_name(&cma_dev_group->device_group, name,
	266	&cma_device_group_type);
1ae1602d CH	267	configfs_add_default_group(&cma_dev_group->ports_group,
1ae1602d CH	268	&cma_dev_group->device_group);
045959db MB	269
	270	cma_deref_dev(cma_dev);
	271	return &cma_dev_group->device_group;
	272
	273	fail:
	274	if (cma_dev)
	275	cma_deref_dev(cma_dev);
	276	kfree(cma_dev_group);
	277	return ERR_PTR(err);
	278	}
	279
	280	static struct configfs_group_operations cma_subsys_group_ops = {
	281	.make_group = make_cma_dev,
	282	};
	283
	284	static struct config_item_type cma_subsys_type = {
	285	.ct_group_ops = &cma_subsys_group_ops,
	286	.ct_owner = THIS_MODULE,
	287	};
	288
	289	static struct configfs_subsystem cma_subsys = {
	290	.su_group = {
	291	.cg_item = {
	292	.ci_namebuf = "rdma_cm",
	293	.ci_type = &cma_subsys_type,
	294	},
	295	},
	296	};
	297
	298	int __init cma_configfs_init(void)
	299	{
	300	config_group_init(&cma_subsys.su_group);
	301	mutex_init(&cma_subsys.su_mutex);
	302	return configfs_register_subsystem(&cma_subsys);
	303	}
	304
	305	void __exit cma_configfs_exit(void)
	306	{
	307	configfs_unregister_subsystem(&cma_subsys);
	308	}