[mirror_ubuntu-zesty-kernel.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 config_group		*default_dev_group[2];
	struct config_group		**default_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;
	struct config_group **ports_group;
	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);
	ports_group = kcalloc(ports_num + 1, sizeof(*ports_group), GFP_KERNEL);

	if (!ports || !ports_group) {
		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);
		ports_group[i] = &ports[i].group;
	}
	ports_group[i] = NULL;
	cma_dev_group->default_ports_group = ports_group;
	cma_dev_group->ports = ports;

	return 0;
free:
	kfree(ports);
	kfree(ports_group);
	cma_dev_group->ports = NULL;
	cma_dev_group->default_ports_group = 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);
	kfree(cma_dev_group->default_ports_group);
	cma_dev_group->ports = NULL;
	cma_dev_group->default_ports_group = 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));

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

	cma_dev_group->ports_group.default_groups =
		cma_dev_group->default_ports_group;
	config_group_init_type_name(&cma_dev_group->ports_group, "ports",
				    &cma_ports_group_type);

	cma_dev_group->device_group.default_groups
		= cma_dev_group->default_dev_group;
	cma_dev_group->default_dev_group[0] = &cma_dev_group->ports_group;
	cma_dev_group->default_dev_group[1] = NULL;

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

	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;
	52	struct config_group *default_dev_group[2];
	53	struct config_group **default_ports_group;
	54	struct cma_dev_port_group *ports;
	55	};
	56
	57	static struct cma_dev_port_group to_dev_port_group(struct config_item item)
	58	{
	59	struct config_group *group;
	60
	61	if (!item)
	62	return NULL;
	63
	64	group = container_of(item, struct config_group, cg_item);
65	return container_of(group, struct cma_dev_port_group, group);
66	}
67
68	static bool filter_by_name(struct ib_device ib_dev, void cookie)
69	{
70	return !strcmp(ib_dev->name, cookie);
71	}
72
73	static int cma_configfs_params_get(struct config_item *item,
74	struct cma_device **pcma_dev,
75	struct cma_dev_port_group **pgroup)
76	{
77	struct cma_dev_port_group *group = to_dev_port_group(item);
78	struct cma_device *cma_dev;
79
80	if (!group)
81	return -ENODEV;
82
83	cma_dev = cma_enum_devices_by_ibdev(filter_by_name,
84	group->cma_dev_group->name);
85	if (!cma_dev)
86	return -ENODEV;
87
88	*pcma_dev = cma_dev;
89	*pgroup = group;
90
91	return 0;
92	}
93
94	static void cma_configfs_params_put(struct cma_device *cma_dev)
95	{
96	cma_deref_dev(cma_dev);
97	}
98
99	static ssize_t default_roce_mode_show(struct config_item *item,
100	char *buf)
101	{
102	struct cma_device *cma_dev;
103	struct cma_dev_port_group *group;
104	int gid_type;
105	ssize_t ret;
106
107	ret = cma_configfs_params_get(item, &cma_dev, &group);
108	if (ret)
109	return ret;
110
111	gid_type = cma_get_default_gid_type(cma_dev, group->port_num);
112	cma_configfs_params_put(cma_dev);
113
114	if (gid_type < 0)
115	return gid_type;
116
117	return sprintf(buf, "%s\n", ib_cache_gid_type_str(gid_type));
118	}
119
120	static ssize_t default_roce_mode_store(struct config_item *item,
121	const char *buf, size_t count)
122	{
123	struct cma_device *cma_dev;
124	struct cma_dev_port_group *group;
125	int gid_type = ib_cache_gid_parse_type_str(buf);
126	ssize_t ret;
127
128	if (gid_type < 0)
129	return -EINVAL;
130
131	ret = cma_configfs_params_get(item, &cma_dev, &group);
132	if (ret)
133	return ret;
134
135	ret = cma_set_default_gid_type(cma_dev, group->port_num, gid_type);
136
137	cma_configfs_params_put(cma_dev);
138
139	return !ret ? strnlen(buf, count) : ret;
140	}
141
142	CONFIGFS_ATTR(, default_roce_mode);
143
144	static struct configfs_attribute *cma_configfs_attributes[] = {
145	&attr_default_roce_mode,
146	NULL,
147	};
148
149	static struct config_item_type cma_port_group_type = {
150	.ct_attrs = cma_configfs_attributes,
151	.ct_owner = THIS_MODULE
152	};
153
154	static int make_cma_ports(struct cma_dev_group *cma_dev_group,
155	struct cma_device *cma_dev)
156	{
157	struct ib_device *ibdev;
158	unsigned int i;
159	unsigned int ports_num;
160	struct cma_dev_port_group *ports;
a7d0e959	161	struct config_group **ports_group;
045959db MB	162	int err;
	163
	164	ibdev = cma_get_ib_dev(cma_dev);
	165
	166	if (!ibdev)
	167	return -ENODEV;
	168
	169	ports_num = ibdev->phys_port_cnt;
	170	ports = kcalloc(ports_num, sizeof(*cma_dev_group->ports),
	171	GFP_KERNEL);
a7d0e959	172	ports_group = kcalloc(ports_num + 1, sizeof(*ports_group), GFP_KERNEL);
045959db	173
a7d0e959	174	if (!ports \|\| !ports_group) {
045959db MB	175	err = -ENOMEM;
	176	goto free;
	177	}
	178
	179	for (i = 0; i < ports_num; i++) {
	180	char port_str[10];
	181
	182	ports[i].port_num = i + 1;
	183	snprintf(port_str, sizeof(port_str), "%u", i + 1);
	184	ports[i].cma_dev_group = cma_dev_group;
	185	config_group_init_type_name(&ports[i].group,
	186	port_str,
	187	&cma_port_group_type);
a7d0e959	188	ports_group[i] = &ports[i].group;
045959db	189	}
a7d0e959 DC	190	ports_group[i] = NULL;
a7d0e959 DC	191	cma_dev_group->default_ports_group = ports_group;
045959db MB	192	cma_dev_group->ports = ports;
	193
	194	return 0;
	195	free:
	196	kfree(ports);
a7d0e959	197	kfree(ports_group);
045959db MB	198	cma_dev_group->ports = NULL;
	199	cma_dev_group->default_ports_group = NULL;
	200	return err;
	201	}
	202
	203	static void release_cma_dev(struct config_item *item)
	204	{
	205	struct config_group *group = container_of(item, struct config_group,
	206	cg_item);
	207	struct cma_dev_group *cma_dev_group = container_of(group,
	208	struct cma_dev_group,
	209	device_group);
	210
	211	kfree(cma_dev_group);
	212	};
	213
	214	static void release_cma_ports_group(struct config_item *item)
	215	{
	216	struct config_group *group = container_of(item, struct config_group,
	217	cg_item);
	218	struct cma_dev_group *cma_dev_group = container_of(group,
	219	struct cma_dev_group,
	220	ports_group);
	221
	222	kfree(cma_dev_group->ports);
	223	kfree(cma_dev_group->default_ports_group);
	224	cma_dev_group->ports = NULL;
	225	cma_dev_group->default_ports_group = NULL;
	226	};
	227
	228	static struct configfs_item_operations cma_ports_item_ops = {
	229	.release = release_cma_ports_group
	230	};
	231
	232	static struct config_item_type cma_ports_group_type = {
	233	.ct_item_ops = &cma_ports_item_ops,
	234	.ct_owner = THIS_MODULE
	235	};
	236
	237	static struct configfs_item_operations cma_device_item_ops = {
	238	.release = release_cma_dev
	239	};
	240
	241	static struct config_item_type cma_device_group_type = {
	242	.ct_item_ops = &cma_device_item_ops,
	243	.ct_owner = THIS_MODULE
	244	};
	245
	246	static struct config_group make_cma_dev(struct config_group group,
	247	const char *name)
	248	{
	249	int err = -ENODEV;
	250	struct cma_device *cma_dev = cma_enum_devices_by_ibdev(filter_by_name,
	251	(void *)name);
	252	struct cma_dev_group *cma_dev_group = NULL;
	253
	254	if (!cma_dev)
	255	goto fail;
	256
	257	cma_dev_group = kzalloc(sizeof(*cma_dev_group), GFP_KERNEL);
	258
	259	if (!cma_dev_group) {
	260	err = -ENOMEM;
	261	goto fail;
262	}
263
264	strncpy(cma_dev_group->name, name, sizeof(cma_dev_group->name));
265
266	err = make_cma_ports(cma_dev_group, cma_dev);
267	if (err)
268	goto fail;
269
270	cma_dev_group->ports_group.default_groups =
271	cma_dev_group->default_ports_group;
272	config_group_init_type_name(&cma_dev_group->ports_group, "ports",
273	&cma_ports_group_type);
274
275	cma_dev_group->device_group.default_groups
276	= cma_dev_group->default_dev_group;
277	cma_dev_group->default_dev_group[0] = &cma_dev_group->ports_group;
278	cma_dev_group->default_dev_group[1] = NULL;
279
280	config_group_init_type_name(&cma_dev_group->device_group, name,
281	&cma_device_group_type);
282
283	cma_deref_dev(cma_dev);
284	return &cma_dev_group->device_group;
285
286	fail:
287	if (cma_dev)
288	cma_deref_dev(cma_dev);
289	kfree(cma_dev_group);
290	return ERR_PTR(err);
291	}
292
293	static struct configfs_group_operations cma_subsys_group_ops = {
294	.make_group = make_cma_dev,
295	};
296
297	static struct config_item_type cma_subsys_type = {
298	.ct_group_ops = &cma_subsys_group_ops,
299	.ct_owner = THIS_MODULE,
300	};
301
302	static struct configfs_subsystem cma_subsys = {
303	.su_group = {
304	.cg_item = {
305	.ci_namebuf = "rdma_cm",
306	.ci_type = &cma_subsys_type,
307	},
308	},
309	};
310
311	int __init cma_configfs_init(void)
312	{
313	config_group_init(&cma_subsys.su_group);
314	mutex_init(&cma_subsys.su_mutex);
315	return configfs_register_subsystem(&cma_subsys);
316	}
317
318	void __exit cma_configfs_exit(void)
319	{
320	configfs_unregister_subsystem(&cma_subsys);
321	}