[linux-block.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 <rdma/rdma_cm.h>

#include "core_priv.h"
#include "cma_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(dev_name(&ib_dev->dev), 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_dev_put(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 ssize_t default_roce_tos_show(struct config_item *item, char *buf)
{
	struct cma_device *cma_dev;
	struct cma_dev_port_group *group;
	ssize_t ret;
	u8 tos;

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

	tos = cma_get_default_roce_tos(cma_dev, group->port_num);
	cma_configfs_params_put(cma_dev);

	return sprintf(buf, "%u\n", tos);
}

static ssize_t default_roce_tos_store(struct config_item *item,
				      const char *buf, size_t count)
{
	struct cma_device *cma_dev;
	struct cma_dev_port_group *group;
	ssize_t ret;
	u8 tos;

	ret = kstrtou8(buf, 0, &tos);
	if (ret)
		return ret;

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

	ret = cma_set_default_roce_tos(cma_dev, group->port_num, tos);
	cma_configfs_params_put(cma_dev);

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

CONFIGFS_ATTR(, default_roce_tos);

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

static const 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 const 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 const 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;
	}

	strlcpy(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_dev_put(cma_dev);
	return &cma_dev_group->device_group;

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

static void drop_cma_dev(struct config_group *cgroup, 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);

	configfs_remove_default_groups(&cma_dev_group->ports_group);
	configfs_remove_default_groups(&cma_dev_group->device_group);
	config_item_put(item);
}

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

static const 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)
{
	int ret;

	config_group_init(&cma_subsys.su_group);
	mutex_init(&cma_subsys.su_mutex);
	ret = configfs_register_subsystem(&cma_subsys);
	if (ret)
		mutex_destroy(&cma_subsys.su_mutex);
	return ret;
}

void __exit cma_configfs_exit(void)
{
	configfs_unregister_subsystem(&cma_subsys);
	mutex_destroy(&cma_subsys.su_mutex);
}
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>
eeb8df87 PP	36	#include <rdma/rdma_cm.h>
eeb8df87 PP	37
045959db	38	#include "core_priv.h"
eeb8df87	39	#include "cma_priv.h"
045959db MB	40
	41	struct cma_device;
	42
	43	struct cma_dev_group;
	44
	45	struct cma_dev_port_group {
	46	unsigned int port_num;
	47	struct cma_dev_group *cma_dev_group;
	48	struct config_group group;
	49	};
	50
	51	struct cma_dev_group {
	52	char name[IB_DEVICE_NAME_MAX];
	53	struct config_group device_group;
	54	struct config_group ports_group;
045959db MB	55	struct cma_dev_port_group *ports;
	56	};
	57
	58	static struct cma_dev_port_group to_dev_port_group(struct config_item item)
	59	{
	60	struct config_group *group;
	61
	62	if (!item)
	63	return NULL;
	64
	65	group = container_of(item, struct config_group, cg_item);
	66	return container_of(group, struct cma_dev_port_group, group);
	67	}
	68
	69	static bool filter_by_name(struct ib_device ib_dev, void cookie)
	70	{
896de009	71	return !strcmp(dev_name(&ib_dev->dev), cookie);
045959db MB	72	}
	73
	74	static int cma_configfs_params_get(struct config_item *item,
	75	struct cma_device **pcma_dev,
	76	struct cma_dev_port_group **pgroup)
	77	{
	78	struct cma_dev_port_group *group = to_dev_port_group(item);
	79	struct cma_device *cma_dev;
	80
	81	if (!group)
	82	return -ENODEV;
	83
	84	cma_dev = cma_enum_devices_by_ibdev(filter_by_name,
	85	group->cma_dev_group->name);
	86	if (!cma_dev)
	87	return -ENODEV;
	88
	89	*pcma_dev = cma_dev;
	90	*pgroup = group;
	91
	92	return 0;
	93	}
	94
	95	static void cma_configfs_params_put(struct cma_device *cma_dev)
	96	{
5ff8c8fa	97	cma_dev_put(cma_dev);
045959db MB	98	}
	99
	100	static ssize_t default_roce_mode_show(struct config_item *item,
	101	char *buf)
	102	{
	103	struct cma_device *cma_dev;
	104	struct cma_dev_port_group *group;
	105	int gid_type;
	106	ssize_t ret;
	107
	108	ret = cma_configfs_params_get(item, &cma_dev, &group);
	109	if (ret)
	110	return ret;
	111
	112	gid_type = cma_get_default_gid_type(cma_dev, group->port_num);
	113	cma_configfs_params_put(cma_dev);
	114
	115	if (gid_type < 0)
	116	return gid_type;
	117
	118	return sprintf(buf, "%s\n", ib_cache_gid_type_str(gid_type));
	119	}
	120
	121	static ssize_t default_roce_mode_store(struct config_item *item,
	122	const char *buf, size_t count)
	123	{
	124	struct cma_device *cma_dev;
	125	struct cma_dev_port_group *group;
	126	int gid_type = ib_cache_gid_parse_type_str(buf);
	127	ssize_t ret;
	128
	129	if (gid_type < 0)
	130	return -EINVAL;
	131
	132	ret = cma_configfs_params_get(item, &cma_dev, &group);
	133	if (ret)
	134	return ret;
	135
	136	ret = cma_set_default_gid_type(cma_dev, group->port_num, gid_type);
	137
	138	cma_configfs_params_put(cma_dev);
	139
	140	return !ret ? strnlen(buf, count) : ret;
	141	}
	142
	143	CONFIGFS_ATTR(, default_roce_mode);
	144
89052d78 MD	145	static ssize_t default_roce_tos_show(struct config_item item, char buf)
	146	{
	147	struct cma_device *cma_dev;
	148	struct cma_dev_port_group *group;
	149	ssize_t ret;
	150	u8 tos;
	151
	152	ret = cma_configfs_params_get(item, &cma_dev, &group);
	153	if (ret)
	154	return ret;
	155
	156	tos = cma_get_default_roce_tos(cma_dev, group->port_num);
	157	cma_configfs_params_put(cma_dev);
	158
	159	return sprintf(buf, "%u\n", tos);
	160	}
	161
	162	static ssize_t default_roce_tos_store(struct config_item *item,
	163	const char *buf, size_t count)
	164	{
	165	struct cma_device *cma_dev;
	166	struct cma_dev_port_group *group;
	167	ssize_t ret;
	168	u8 tos;
	169
	170	ret = kstrtou8(buf, 0, &tos);
	171	if (ret)
	172	return ret;
	173
	174	ret = cma_configfs_params_get(item, &cma_dev, &group);
	175	if (ret)
	176	return ret;
	177
	178	ret = cma_set_default_roce_tos(cma_dev, group->port_num, tos);
	179	cma_configfs_params_put(cma_dev);
	180
	181	return ret ? ret : strnlen(buf, count);
	182	}
	183
	184	CONFIGFS_ATTR(, default_roce_tos);
	185
045959db MB	186	static struct configfs_attribute *cma_configfs_attributes[] = {
045959db MB	187	&attr_default_roce_mode,
89052d78	188	&attr_default_roce_tos,
045959db MB	189	NULL,
	190	};
	191
6ace4f6b	192	static const struct config_item_type cma_port_group_type = {
045959db MB	193	.ct_attrs = cma_configfs_attributes,
	194	.ct_owner = THIS_MODULE
	195	};
	196
	197	static int make_cma_ports(struct cma_dev_group *cma_dev_group,
	198	struct cma_device *cma_dev)
	199	{
	200	struct ib_device *ibdev;
	201	unsigned int i;
	202	unsigned int ports_num;
	203	struct cma_dev_port_group *ports;
	204	int err;
	205
	206	ibdev = cma_get_ib_dev(cma_dev);
	207
	208	if (!ibdev)
	209	return -ENODEV;
	210
	211	ports_num = ibdev->phys_port_cnt;
	212	ports = kcalloc(ports_num, sizeof(*cma_dev_group->ports),
	213	GFP_KERNEL);
	214
1ae1602d	215	if (!ports) {
045959db MB	216	err = -ENOMEM;
	217	goto free;
	218	}
	219
	220	for (i = 0; i < ports_num; i++) {
	221	char port_str[10];
	222
	223	ports[i].port_num = i + 1;
	224	snprintf(port_str, sizeof(port_str), "%u", i + 1);
	225	ports[i].cma_dev_group = cma_dev_group;
	226	config_group_init_type_name(&ports[i].group,
	227	port_str,
	228	&cma_port_group_type);
1ae1602d CH	229	configfs_add_default_group(&ports[i].group,
	230	&cma_dev_group->ports_group);
	231
045959db	232	}
045959db MB	233	cma_dev_group->ports = ports;
	234
	235	return 0;
	236	free:
	237	kfree(ports);
045959db	238	cma_dev_group->ports = NULL;
045959db MB	239	return err;
	240	}
	241
	242	static void release_cma_dev(struct config_item *item)
	243	{
	244	struct config_group *group = container_of(item, struct config_group,
	245	cg_item);
	246	struct cma_dev_group *cma_dev_group = container_of(group,
	247	struct cma_dev_group,
	248	device_group);
	249
	250	kfree(cma_dev_group);
	251	};
	252
	253	static void release_cma_ports_group(struct config_item *item)
	254	{
	255	struct config_group *group = container_of(item, struct config_group,
	256	cg_item);
	257	struct cma_dev_group *cma_dev_group = container_of(group,
	258	struct cma_dev_group,
	259	ports_group);
	260
	261	kfree(cma_dev_group->ports);
045959db	262	cma_dev_group->ports = NULL;
045959db MB	263	};
	264
	265	static struct configfs_item_operations cma_ports_item_ops = {
	266	.release = release_cma_ports_group
	267	};
	268
6ace4f6b	269	static const struct config_item_type cma_ports_group_type = {
045959db MB	270	.ct_item_ops = &cma_ports_item_ops,
	271	.ct_owner = THIS_MODULE
	272	};
	273
	274	static struct configfs_item_operations cma_device_item_ops = {
	275	.release = release_cma_dev
	276	};
	277
6ace4f6b	278	static const struct config_item_type cma_device_group_type = {
045959db MB	279	.ct_item_ops = &cma_device_item_ops,
	280	.ct_owner = THIS_MODULE
	281	};
	282
	283	static struct config_group make_cma_dev(struct config_group group,
	284	const char *name)
	285	{
	286	int err = -ENODEV;
	287	struct cma_device *cma_dev = cma_enum_devices_by_ibdev(filter_by_name,
	288	(void *)name);
	289	struct cma_dev_group *cma_dev_group = NULL;
	290
	291	if (!cma_dev)
	292	goto fail;
	293
	294	cma_dev_group = kzalloc(sizeof(*cma_dev_group), GFP_KERNEL);
	295
	296	if (!cma_dev_group) {
	297	err = -ENOMEM;
	298	goto fail;
	299	}
	300
979a459c	301	strlcpy(cma_dev_group->name, name, sizeof(cma_dev_group->name));
045959db	302
045959db MB	303	config_group_init_type_name(&cma_dev_group->ports_group, "ports",
	304	&cma_ports_group_type);
	305
1ae1602d CH	306	err = make_cma_ports(cma_dev_group, cma_dev);
	307	if (err)
	308	goto fail;
045959db MB	309
	310	config_group_init_type_name(&cma_dev_group->device_group, name,
	311	&cma_device_group_type);
1ae1602d CH	312	configfs_add_default_group(&cma_dev_group->ports_group,
1ae1602d CH	313	&cma_dev_group->device_group);
045959db	314
5ff8c8fa	315	cma_dev_put(cma_dev);
045959db MB	316	return &cma_dev_group->device_group;
	317
	318	fail:
	319	if (cma_dev)
5ff8c8fa	320	cma_dev_put(cma_dev);
045959db MB	321	kfree(cma_dev_group);
	322	return ERR_PTR(err);
	323	}
	324
63a3345c MG	325	static void drop_cma_dev(struct config_group cgroup, struct config_item item)
	326	{
	327	struct config_group *group =
	328	container_of(item, struct config_group, cg_item);
	329	struct cma_dev_group *cma_dev_group =
	330	container_of(group, struct cma_dev_group, device_group);
	331
	332	configfs_remove_default_groups(&cma_dev_group->ports_group);
	333	configfs_remove_default_groups(&cma_dev_group->device_group);
	334	config_item_put(item);
	335	}
	336
045959db MB	337	static struct configfs_group_operations cma_subsys_group_ops = {
045959db MB	338	.make_group = make_cma_dev,
63a3345c	339	.drop_item = drop_cma_dev,
045959db MB	340	};
045959db MB	341
6ace4f6b	342	static const struct config_item_type cma_subsys_type = {
045959db MB	343	.ct_group_ops = &cma_subsys_group_ops,
	344	.ct_owner = THIS_MODULE,
	345	};
	346
	347	static struct configfs_subsystem cma_subsys = {
	348	.su_group = {
	349	.cg_item = {
	350	.ci_namebuf = "rdma_cm",
	351	.ci_type = &cma_subsys_type,
	352	},
	353	},
	354	};
	355
	356	int __init cma_configfs_init(void)
	357	{
56594ae1 PP	358	int ret;
56594ae1 PP	359
045959db MB	360	config_group_init(&cma_subsys.su_group);
045959db MB	361	mutex_init(&cma_subsys.su_mutex);
56594ae1 PP	362	ret = configfs_register_subsystem(&cma_subsys);
	363	if (ret)
	364	mutex_destroy(&cma_subsys.su_mutex);
	365	return ret;
045959db MB	366	}
	367
	368	void __exit cma_configfs_exit(void)
	369	{
	370	configfs_unregister_subsystem(&cma_subsys);
56594ae1	371	mutex_destroy(&cma_subsys.su_mutex);
045959db	372	}