[net-next-2.6.git] / net / rds / ib.c

/*
 * Copyright (c) 2006 Oracle.  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/kernel.h>
#include <linux/in.h>
#include <linux/if.h>
#include <linux/netdevice.h>
#include <linux/inetdevice.h>
#include <linux/if_arp.h>
#include <linux/delay.h>

#include "rds.h"
#include "ib.h"

unsigned int fmr_pool_size = RDS_FMR_POOL_SIZE;
unsigned int fmr_message_size = RDS_FMR_SIZE + 1; /* +1 allows for unaligned MRs */

module_param(fmr_pool_size, int, 0444);
MODULE_PARM_DESC(fmr_pool_size, " Max number of fmr per HCA");
module_param(fmr_message_size, int, 0444);
MODULE_PARM_DESC(fmr_message_size, " Max size of a RDMA transfer");

struct list_head rds_ib_devices;

DEFINE_SPINLOCK(ib_nodev_conns_lock);
LIST_HEAD(ib_nodev_conns);

void rds_ib_add_one(struct ib_device *device)
{
	struct rds_ib_device *rds_ibdev;
	struct ib_device_attr *dev_attr;

	/* Only handle IB (no iWARP) devices */
	if (device->node_type != RDMA_NODE_IB_CA)
		return;

	dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
	if (!dev_attr)
		return;

	if (ib_query_device(device, dev_attr)) {
		rdsdebug("Query device failed for %s\n", device->name);
		goto free_attr;
	}

	rds_ibdev = kmalloc(sizeof *rds_ibdev, GFP_KERNEL);
	if (!rds_ibdev)
		goto free_attr;

	spin_lock_init(&rds_ibdev->spinlock);

	rds_ibdev->max_wrs = dev_attr->max_qp_wr;
	rds_ibdev->max_sge = min(dev_attr->max_sge, RDS_IB_MAX_SGE);

	rds_ibdev->fmr_page_shift = max(9, ffs(dev_attr->page_size_cap) - 1);
	rds_ibdev->fmr_page_size  = 1 << rds_ibdev->fmr_page_shift;
	rds_ibdev->fmr_page_mask  = ~((u64) rds_ibdev->fmr_page_size - 1);
	rds_ibdev->fmr_max_remaps = dev_attr->max_map_per_fmr?: 32;
	rds_ibdev->max_fmrs = dev_attr->max_fmr ?
			min_t(unsigned int, dev_attr->max_fmr, fmr_pool_size) :
			fmr_pool_size;

	rds_ibdev->dev = device;
	rds_ibdev->pd = ib_alloc_pd(device);
	if (IS_ERR(rds_ibdev->pd))
		goto free_dev;

	rds_ibdev->mr = ib_get_dma_mr(rds_ibdev->pd,
				      IB_ACCESS_LOCAL_WRITE);
	if (IS_ERR(rds_ibdev->mr))
		goto err_pd;

	rds_ibdev->mr_pool = rds_ib_create_mr_pool(rds_ibdev);
	if (IS_ERR(rds_ibdev->mr_pool)) {
		rds_ibdev->mr_pool = NULL;
		goto err_mr;
	}

	INIT_LIST_HEAD(&rds_ibdev->ipaddr_list);
	INIT_LIST_HEAD(&rds_ibdev->conn_list);
	list_add_tail(&rds_ibdev->list, &rds_ib_devices);

	ib_set_client_data(device, &rds_ib_client, rds_ibdev);

	goto free_attr;

err_mr:
	ib_dereg_mr(rds_ibdev->mr);
err_pd:
	ib_dealloc_pd(rds_ibdev->pd);
free_dev:
	kfree(rds_ibdev);
free_attr:
	kfree(dev_attr);
}

void rds_ib_remove_one(struct ib_device *device)
{
	struct rds_ib_device *rds_ibdev;
	struct rds_ib_ipaddr *i_ipaddr, *i_next;

	rds_ibdev = ib_get_client_data(device, &rds_ib_client);
	if (!rds_ibdev)
		return;

	list_for_each_entry_safe(i_ipaddr, i_next, &rds_ibdev->ipaddr_list, list) {
		list_del(&i_ipaddr->list);
		kfree(i_ipaddr);
	}

	rds_ib_remove_conns(rds_ibdev);

	if (rds_ibdev->mr_pool)
		rds_ib_destroy_mr_pool(rds_ibdev->mr_pool);

	ib_dereg_mr(rds_ibdev->mr);

	while (ib_dealloc_pd(rds_ibdev->pd)) {
		rdsdebug("Failed to dealloc pd %p\n", rds_ibdev->pd);
		msleep(1);
	}

	list_del(&rds_ibdev->list);
	kfree(rds_ibdev);
}

struct ib_client rds_ib_client = {
	.name   = "rds_ib",
	.add    = rds_ib_add_one,
	.remove = rds_ib_remove_one
};

static int rds_ib_conn_info_visitor(struct rds_connection *conn,
				    void *buffer)
{
	struct rds_info_rdma_connection *iinfo = buffer;
	struct rds_ib_connection *ic;

	/* We will only ever look at IB transports */
	if (conn->c_trans != &rds_ib_transport)
		return 0;

	iinfo->src_addr = conn->c_laddr;
	iinfo->dst_addr = conn->c_faddr;

	memset(&iinfo->src_gid, 0, sizeof(iinfo->src_gid));
	memset(&iinfo->dst_gid, 0, sizeof(iinfo->dst_gid));
	if (rds_conn_state(conn) == RDS_CONN_UP) {
		struct rds_ib_device *rds_ibdev;
		struct rdma_dev_addr *dev_addr;

		ic = conn->c_transport_data;
		dev_addr = &ic->i_cm_id->route.addr.dev_addr;

		ib_addr_get_sgid(dev_addr, (union ib_gid *) &iinfo->src_gid);
		ib_addr_get_dgid(dev_addr, (union ib_gid *) &iinfo->dst_gid);

		rds_ibdev = ib_get_client_data(ic->i_cm_id->device, &rds_ib_client);
		iinfo->max_send_wr = ic->i_send_ring.w_nr;
		iinfo->max_recv_wr = ic->i_recv_ring.w_nr;
		iinfo->max_send_sge = rds_ibdev->max_sge;
		rds_ib_get_mr_info(rds_ibdev, iinfo);
	}
	return 1;
}

static void rds_ib_ic_info(struct socket *sock, unsigned int len,
			   struct rds_info_iterator *iter,
			   struct rds_info_lengths *lens)
{
	rds_for_each_conn_info(sock, len, iter, lens,
				rds_ib_conn_info_visitor,
				sizeof(struct rds_info_rdma_connection));
}


/*
 * Early RDS/IB was built to only bind to an address if there is an IPoIB
 * device with that address set.
 *
 * If it were me, I'd advocate for something more flexible.  Sending and
 * receiving should be device-agnostic.  Transports would try and maintain
 * connections between peers who have messages queued.  Userspace would be
 * allowed to influence which paths have priority.  We could call userspace
 * asserting this policy "routing".
 */
static int rds_ib_laddr_check(__be32 addr)
{
	int ret;
	struct rdma_cm_id *cm_id;
	struct sockaddr_in sin;

	/* Create a CMA ID and try to bind it. This catches both
	 * IB and iWARP capable NICs.
	 */
	cm_id = rdma_create_id(NULL, NULL, RDMA_PS_TCP);
	if (!cm_id)
		return -EADDRNOTAVAIL;

	memset(&sin, 0, sizeof(sin));
	sin.sin_family = AF_INET;
	sin.sin_addr.s_addr = addr;

	/* rdma_bind_addr will only succeed for IB & iWARP devices */
	ret = rdma_bind_addr(cm_id, (struct sockaddr *)&sin);
	/* due to this, we will claim to support iWARP devices unless we
	   check node_type. */
	if (ret || cm_id->device->node_type != RDMA_NODE_IB_CA)
		ret = -EADDRNOTAVAIL;

	rdsdebug("addr %pI4 ret %d node type %d\n",
		&addr, ret,
		cm_id->device ? cm_id->device->node_type : -1);

	rdma_destroy_id(cm_id);

	return ret;
}

void rds_ib_exit(void)
{
	rds_info_deregister_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info);
	rds_ib_remove_nodev_conns();
	ib_unregister_client(&rds_ib_client);
	rds_ib_sysctl_exit();
	rds_ib_recv_exit();
	rds_trans_unregister(&rds_ib_transport);
}

struct rds_transport rds_ib_transport = {
	.laddr_check		= rds_ib_laddr_check,
	.xmit_complete		= rds_ib_xmit_complete,
	.xmit			= rds_ib_xmit,
	.xmit_cong_map		= NULL,
	.xmit_rdma		= rds_ib_xmit_rdma,
	.recv			= rds_ib_recv,
	.conn_alloc		= rds_ib_conn_alloc,
	.conn_free		= rds_ib_conn_free,
	.conn_connect		= rds_ib_conn_connect,
	.conn_shutdown		= rds_ib_conn_shutdown,
	.inc_copy_to_user	= rds_ib_inc_copy_to_user,
	.inc_purge		= rds_ib_inc_purge,
	.inc_free		= rds_ib_inc_free,
	.cm_initiate_connect	= rds_ib_cm_initiate_connect,
	.cm_handle_connect	= rds_ib_cm_handle_connect,
	.cm_connect_complete	= rds_ib_cm_connect_complete,
	.stats_info_copy	= rds_ib_stats_info_copy,
	.exit			= rds_ib_exit,
	.get_mr			= rds_ib_get_mr,
	.sync_mr		= rds_ib_sync_mr,
	.free_mr		= rds_ib_free_mr,
	.flush_mrs		= rds_ib_flush_mrs,
	.t_owner		= THIS_MODULE,
	.t_name			= "infiniband",
};

int __init rds_ib_init(void)
{
	int ret;

	INIT_LIST_HEAD(&rds_ib_devices);

	ret = ib_register_client(&rds_ib_client);
	if (ret)
		goto out;

	ret = rds_ib_sysctl_init();
	if (ret)
		goto out_ibreg;

	ret = rds_ib_recv_init();
	if (ret)
		goto out_sysctl;

	ret = rds_trans_register(&rds_ib_transport);
	if (ret)
		goto out_recv;

	rds_info_register_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info);

	goto out;

out_recv:
	rds_ib_recv_exit();
out_sysctl:
	rds_ib_sysctl_exit();
out_ibreg:
	ib_unregister_client(&rds_ib_client);
out:
	return ret;
}

MODULE_LICENSE("GPL");
Commit	Line	Data
ec16227e AG	1	/*
	2	* Copyright (c) 2006 Oracle. 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/kernel.h>
	34	#include <linux/in.h>
	35	#include <linux/if.h>
	36	#include <linux/netdevice.h>
	37	#include <linux/inetdevice.h>
	38	#include <linux/if_arp.h>
	39	#include <linux/delay.h>
	40
	41	#include "rds.h"
	42	#include "ib.h"
	43
	44	unsigned int fmr_pool_size = RDS_FMR_POOL_SIZE;
	45	unsigned int fmr_message_size = RDS_FMR_SIZE + 1; /* +1 allows for unaligned MRs */
	46
	47	module_param(fmr_pool_size, int, 0444);
	48	MODULE_PARM_DESC(fmr_pool_size, " Max number of fmr per HCA");
	49	module_param(fmr_message_size, int, 0444);
	50	MODULE_PARM_DESC(fmr_message_size, " Max size of a RDMA transfer");
	51
	52	struct list_head rds_ib_devices;
	53
	54	DEFINE_SPINLOCK(ib_nodev_conns_lock);
	55	LIST_HEAD(ib_nodev_conns);
	56
	57	void rds_ib_add_one(struct ib_device *device)
	58	{
	59	struct rds_ib_device *rds_ibdev;
	60	struct ib_device_attr *dev_attr;
	61
	62	/* Only handle IB (no iWARP) devices */
	63	if (device->node_type != RDMA_NODE_IB_CA)
	64	return;
65
66	dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
67	if (!dev_attr)
68	return;
69
70	if (ib_query_device(device, dev_attr)) {
71	rdsdebug("Query device failed for %s\n", device->name);
72	goto free_attr;
73	}
74
75	rds_ibdev = kmalloc(sizeof *rds_ibdev, GFP_KERNEL);
76	if (!rds_ibdev)
77	goto free_attr;
78
79	spin_lock_init(&rds_ibdev->spinlock);
80
81	rds_ibdev->max_wrs = dev_attr->max_qp_wr;
82	rds_ibdev->max_sge = min(dev_attr->max_sge, RDS_IB_MAX_SGE);
83
84	rds_ibdev->fmr_page_shift = max(9, ffs(dev_attr->page_size_cap) - 1);
85	rds_ibdev->fmr_page_size = 1 << rds_ibdev->fmr_page_shift;
86	rds_ibdev->fmr_page_mask = ~((u64) rds_ibdev->fmr_page_size - 1);
87	rds_ibdev->fmr_max_remaps = dev_attr->max_map_per_fmr?: 32;
88	rds_ibdev->max_fmrs = dev_attr->max_fmr ?
89	min_t(unsigned int, dev_attr->max_fmr, fmr_pool_size) :
90	fmr_pool_size;
91
92	rds_ibdev->dev = device;
93	rds_ibdev->pd = ib_alloc_pd(device);
94	if (IS_ERR(rds_ibdev->pd))
95	goto free_dev;
96
97	rds_ibdev->mr = ib_get_dma_mr(rds_ibdev->pd,
98	IB_ACCESS_LOCAL_WRITE);
99	if (IS_ERR(rds_ibdev->mr))
100	goto err_pd;
101
102	rds_ibdev->mr_pool = rds_ib_create_mr_pool(rds_ibdev);
103	if (IS_ERR(rds_ibdev->mr_pool)) {
104	rds_ibdev->mr_pool = NULL;
105	goto err_mr;
106	}
107
108	INIT_LIST_HEAD(&rds_ibdev->ipaddr_list);
109	INIT_LIST_HEAD(&rds_ibdev->conn_list);
110	list_add_tail(&rds_ibdev->list, &rds_ib_devices);
111
112	ib_set_client_data(device, &rds_ib_client, rds_ibdev);
113
114	goto free_attr;
115
116	err_mr:
117	ib_dereg_mr(rds_ibdev->mr);
118	err_pd:
119	ib_dealloc_pd(rds_ibdev->pd);
120	free_dev:
121	kfree(rds_ibdev);
122	free_attr:
123	kfree(dev_attr);
124	}
125
126	void rds_ib_remove_one(struct ib_device *device)
127	{
128	struct rds_ib_device *rds_ibdev;
129	struct rds_ib_ipaddr i_ipaddr, i_next;
130
131	rds_ibdev = ib_get_client_data(device, &rds_ib_client);
132	if (!rds_ibdev)
133	return;
134
135	list_for_each_entry_safe(i_ipaddr, i_next, &rds_ibdev->ipaddr_list, list) {
136	list_del(&i_ipaddr->list);
137	kfree(i_ipaddr);
138	}
139
140	rds_ib_remove_conns(rds_ibdev);
141
142	if (rds_ibdev->mr_pool)
143	rds_ib_destroy_mr_pool(rds_ibdev->mr_pool);
144
145	ib_dereg_mr(rds_ibdev->mr);
146
147	while (ib_dealloc_pd(rds_ibdev->pd)) {
148	rdsdebug("Failed to dealloc pd %p\n", rds_ibdev->pd);
149	msleep(1);
150	}
151
152	list_del(&rds_ibdev->list);
153	kfree(rds_ibdev);
154	}
155
156	struct ib_client rds_ib_client = {
157	.name = "rds_ib",
158	.add = rds_ib_add_one,
159	.remove = rds_ib_remove_one
160	};
161
162	static int rds_ib_conn_info_visitor(struct rds_connection *conn,
163	void *buffer)
164	{
165	struct rds_info_rdma_connection *iinfo = buffer;
166	struct rds_ib_connection *ic;
167
168	/* We will only ever look at IB transports */
169	if (conn->c_trans != &rds_ib_transport)
170	return 0;
171
172	iinfo->src_addr = conn->c_laddr;
173	iinfo->dst_addr = conn->c_faddr;
174
175	memset(&iinfo->src_gid, 0, sizeof(iinfo->src_gid));
176	memset(&iinfo->dst_gid, 0, sizeof(iinfo->dst_gid));
177	if (rds_conn_state(conn) == RDS_CONN_UP) {
178	struct rds_ib_device *rds_ibdev;
179	struct rdma_dev_addr *dev_addr;
180
181	ic = conn->c_transport_data;
182	dev_addr = &ic->i_cm_id->route.addr.dev_addr;
183
184	ib_addr_get_sgid(dev_addr, (union ib_gid *) &iinfo->src_gid);
185	ib_addr_get_dgid(dev_addr, (union ib_gid *) &iinfo->dst_gid);
186
187	rds_ibdev = ib_get_client_data(ic->i_cm_id->device, &rds_ib_client);
188	iinfo->max_send_wr = ic->i_send_ring.w_nr;
189	iinfo->max_recv_wr = ic->i_recv_ring.w_nr;
190	iinfo->max_send_sge = rds_ibdev->max_sge;
191	rds_ib_get_mr_info(rds_ibdev, iinfo);
192	}
193	return 1;
194	}
195
196	static void rds_ib_ic_info(struct socket *sock, unsigned int len,
197	struct rds_info_iterator *iter,
198	struct rds_info_lengths *lens)
199	{
200	rds_for_each_conn_info(sock, len, iter, lens,
201	rds_ib_conn_info_visitor,
202	sizeof(struct rds_info_rdma_connection));
203	}
204
205
206	/*
207	* Early RDS/IB was built to only bind to an address if there is an IPoIB
208	* device with that address set.
209	*
210	* If it were me, I'd advocate for something more flexible. Sending and
211	* receiving should be device-agnostic. Transports would try and maintain
212	* connections between peers who have messages queued. Userspace would be
213	* allowed to influence which paths have priority. We could call userspace
214	* asserting this policy "routing".
215	*/
216	static int rds_ib_laddr_check(__be32 addr)
217	{
218	int ret;
219	struct rdma_cm_id *cm_id;
220	struct sockaddr_in sin;
221
222	/* Create a CMA ID and try to bind it. This catches both
223	* IB and iWARP capable NICs.
224	*/
225	cm_id = rdma_create_id(NULL, NULL, RDMA_PS_TCP);
226	if (!cm_id)
227	return -EADDRNOTAVAIL;
228
229	memset(&sin, 0, sizeof(sin));
230	sin.sin_family = AF_INET;
231	sin.sin_addr.s_addr = addr;
232
233	/* rdma_bind_addr will only succeed for IB & iWARP devices */
234	ret = rdma_bind_addr(cm_id, (struct sockaddr *)&sin);
235	/* due to this, we will claim to support iWARP devices unless we
236	check node_type. */
237	if (ret \|\| cm_id->device->node_type != RDMA_NODE_IB_CA)
238	ret = -EADDRNOTAVAIL;
239
240	rdsdebug("addr %pI4 ret %d node type %d\n",
241	&addr, ret,
242	cm_id->device ? cm_id->device->node_type : -1);
243
244	rdma_destroy_id(cm_id);
245
246	return ret;
247	}
248
249	void rds_ib_exit(void)
250	{
251	rds_info_deregister_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info);
252	rds_ib_remove_nodev_conns();
253	ib_unregister_client(&rds_ib_client);
254	rds_ib_sysctl_exit();
255	rds_ib_recv_exit();
256	rds_trans_unregister(&rds_ib_transport);
257	}
258
259	struct rds_transport rds_ib_transport = {
260	.laddr_check = rds_ib_laddr_check,
261	.xmit_complete = rds_ib_xmit_complete,
262	.xmit = rds_ib_xmit,
263	.xmit_cong_map = NULL,
264	.xmit_rdma = rds_ib_xmit_rdma,
265	.recv = rds_ib_recv,
266	.conn_alloc = rds_ib_conn_alloc,
267	.conn_free = rds_ib_conn_free,
268	.conn_connect = rds_ib_conn_connect,
269	.conn_shutdown = rds_ib_conn_shutdown,
270	.inc_copy_to_user = rds_ib_inc_copy_to_user,
271	.inc_purge = rds_ib_inc_purge,
272	.inc_free = rds_ib_inc_free,
273	.cm_initiate_connect = rds_ib_cm_initiate_connect,
274	.cm_handle_connect = rds_ib_cm_handle_connect,
275	.cm_connect_complete = rds_ib_cm_connect_complete,
276	.stats_info_copy = rds_ib_stats_info_copy,
277	.exit = rds_ib_exit,
278	.get_mr = rds_ib_get_mr,
279	.sync_mr = rds_ib_sync_mr,
280	.free_mr = rds_ib_free_mr,
281	.flush_mrs = rds_ib_flush_mrs,
282	.t_owner = THIS_MODULE,
283	.t_name = "infiniband",
284	};
285
286	int __init rds_ib_init(void)
287	{
288	int ret;
289
290	INIT_LIST_HEAD(&rds_ib_devices);
291
292	ret = ib_register_client(&rds_ib_client);
293	if (ret)
294	goto out;
295
296	ret = rds_ib_sysctl_init();
297	if (ret)
298	goto out_ibreg;
299
300	ret = rds_ib_recv_init();
301	if (ret)
302	goto out_sysctl;
303
304	ret = rds_trans_register(&rds_ib_transport);
305	if (ret)
306	goto out_recv;
307
308	rds_info_register_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info);
309
310	goto out;
311
312	out_recv:
313	rds_ib_recv_exit();
314	out_sysctl:
315	rds_ib_sysctl_exit();
316	out_ibreg:
317	ib_unregister_client(&rds_ib_client);
318	out:
319	return ret;
320	}
321
322	MODULE_LICENSE("GPL");
323