[linux-block.git] / net / rds / rdma_transport.c

/*
 * Copyright (c) 2009, 2018 Oracle and/or its affiliates. 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 <rdma/rdma_cm.h>

#include "rds_single_path.h"
#include "rdma_transport.h"
#include "ib.h"

/* Global IPv4 and IPv6 RDS RDMA listener cm_id */
static struct rdma_cm_id *rds_rdma_listen_id;
#if IS_ENABLED(CONFIG_IPV6)
static struct rdma_cm_id *rds6_rdma_listen_id;
#endif

/* Per IB specification 7.7.3, service level is a 4-bit field. */
#define TOS_TO_SL(tos)		((tos) & 0xF)

static int rds_rdma_cm_event_handler_cmn(struct rdma_cm_id *cm_id,
					 struct rdma_cm_event *event,
					 bool isv6)
{
	/* this can be null in the listening path */
	struct rds_connection *conn = cm_id->context;
	struct rds_transport *trans;
	int ret = 0;
	int *err;
	u8 len;

	rdsdebug("conn %p id %p handling event %u (%s)\n", conn, cm_id,
		 event->event, rdma_event_msg(event->event));

	if (cm_id->device->node_type == RDMA_NODE_IB_CA)
		trans = &rds_ib_transport;

	/* Prevent shutdown from tearing down the connection
	 * while we're executing. */
	if (conn) {
		mutex_lock(&conn->c_cm_lock);

		/* If the connection is being shut down, bail out
		 * right away. We return 0 so cm_id doesn't get
		 * destroyed prematurely */
		if (rds_conn_state(conn) == RDS_CONN_DISCONNECTING) {
			/* Reject incoming connections while we're tearing
			 * down an existing one. */
			if (event->event == RDMA_CM_EVENT_CONNECT_REQUEST)
				ret = 1;
			goto out;
		}
	}

	switch (event->event) {
	case RDMA_CM_EVENT_CONNECT_REQUEST:
		ret = trans->cm_handle_connect(cm_id, event, isv6);
		break;

	case RDMA_CM_EVENT_ADDR_RESOLVED:
		rdma_set_service_type(cm_id, conn->c_tos);
		rdma_set_min_rnr_timer(cm_id, IB_RNR_TIMER_000_32);
		/* XXX do we need to clean up if this fails? */
		ret = rdma_resolve_route(cm_id,
					 RDS_RDMA_RESOLVE_TIMEOUT_MS);
		break;

	case RDMA_CM_EVENT_ROUTE_RESOLVED:
		/* Connection could have been dropped so make sure the
		 * cm_id is valid before proceeding
		 */
		if (conn) {
			struct rds_ib_connection *ibic;

			ibic = conn->c_transport_data;
			if (ibic && ibic->i_cm_id == cm_id) {
				cm_id->route.path_rec[0].sl =
					TOS_TO_SL(conn->c_tos);
				ret = trans->cm_initiate_connect(cm_id, isv6);
			} else {
				rds_conn_drop(conn);
			}
		}
		break;

	case RDMA_CM_EVENT_ESTABLISHED:
		if (conn)
			trans->cm_connect_complete(conn, event);
		break;

	case RDMA_CM_EVENT_REJECTED:
		if (!conn)
			break;
		err = (int *)rdma_consumer_reject_data(cm_id, event, &len);
		if (!err ||
		    (err && len >= sizeof(*err) &&
		     ((*err) <= RDS_RDMA_REJ_INCOMPAT))) {
			pr_warn("RDS/RDMA: conn <%pI6c, %pI6c> rejected, dropping connection\n",
				&conn->c_laddr, &conn->c_faddr);

			if (!conn->c_tos)
				conn->c_proposed_version = RDS_PROTOCOL_COMPAT_VERSION;

			rds_conn_drop(conn);
		}
		rdsdebug("Connection rejected: %s\n",
			 rdma_reject_msg(cm_id, event->status));
		break;
	case RDMA_CM_EVENT_ADDR_ERROR:
	case RDMA_CM_EVENT_ROUTE_ERROR:
	case RDMA_CM_EVENT_CONNECT_ERROR:
	case RDMA_CM_EVENT_UNREACHABLE:
	case RDMA_CM_EVENT_DEVICE_REMOVAL:
	case RDMA_CM_EVENT_ADDR_CHANGE:
		if (conn)
			rds_conn_drop(conn);
		break;

	case RDMA_CM_EVENT_DISCONNECTED:
		if (!conn)
			break;
		rdsdebug("DISCONNECT event - dropping connection "
			 "%pI6c->%pI6c\n", &conn->c_laddr,
			 &conn->c_faddr);
		rds_conn_drop(conn);
		break;

	case RDMA_CM_EVENT_TIMEWAIT_EXIT:
		if (conn) {
			pr_info("RDS: RDMA_CM_EVENT_TIMEWAIT_EXIT event: dropping connection %pI6c->%pI6c\n",
				&conn->c_laddr, &conn->c_faddr);
			rds_conn_drop(conn);
		}
		break;

	default:
		/* things like device disconnect? */
		printk(KERN_ERR "RDS: unknown event %u (%s)!\n",
		       event->event, rdma_event_msg(event->event));
		break;
	}

out:
	if (conn)
		mutex_unlock(&conn->c_cm_lock);

	rdsdebug("id %p event %u (%s) handling ret %d\n", cm_id, event->event,
		 rdma_event_msg(event->event), ret);

	return ret;
}

int rds_rdma_cm_event_handler(struct rdma_cm_id *cm_id,
			      struct rdma_cm_event *event)
{
	return rds_rdma_cm_event_handler_cmn(cm_id, event, false);
}

#if IS_ENABLED(CONFIG_IPV6)
int rds6_rdma_cm_event_handler(struct rdma_cm_id *cm_id,
			       struct rdma_cm_event *event)
{
	return rds_rdma_cm_event_handler_cmn(cm_id, event, true);
}
#endif

static int rds_rdma_listen_init_common(rdma_cm_event_handler handler,
				       struct sockaddr *sa,
				       struct rdma_cm_id **ret_cm_id)
{
	struct rdma_cm_id *cm_id;
	int ret;

	cm_id = rdma_create_id(&init_net, handler, NULL,
			       RDMA_PS_TCP, IB_QPT_RC);
	if (IS_ERR(cm_id)) {
		ret = PTR_ERR(cm_id);
		printk(KERN_ERR "RDS/RDMA: failed to setup listener, "
		       "rdma_create_id() returned %d\n", ret);
		return ret;
	}

	/*
	 * XXX I bet this binds the cm_id to a device.  If we want to support
	 * fail-over we'll have to take this into consideration.
	 */
	ret = rdma_bind_addr(cm_id, sa);
	if (ret) {
		printk(KERN_ERR "RDS/RDMA: failed to setup listener, "
		       "rdma_bind_addr() returned %d\n", ret);
		goto out;
	}

	ret = rdma_listen(cm_id, 128);
	if (ret) {
		printk(KERN_ERR "RDS/RDMA: failed to setup listener, "
		       "rdma_listen() returned %d\n", ret);
		goto out;
	}

	rdsdebug("cm %p listening on port %u\n", cm_id, RDS_PORT);

	*ret_cm_id = cm_id;
	cm_id = NULL;
out:
	if (cm_id)
		rdma_destroy_id(cm_id);
	return ret;
}

/* Initialize the RDS RDMA listeners.  We create two listeners for
 * compatibility reason.  The one on RDS_PORT is used for IPv4
 * requests only.  The one on RDS_CM_PORT is used for IPv6 requests
 * only.  So only IPv6 enabled RDS module will communicate using this
 * port.
 */
static int rds_rdma_listen_init(void)
{
	int ret;
#if IS_ENABLED(CONFIG_IPV6)
	struct sockaddr_in6 sin6;
#endif
	struct sockaddr_in sin;

	sin.sin_family = PF_INET;
	sin.sin_addr.s_addr = htonl(INADDR_ANY);
	sin.sin_port = htons(RDS_PORT);
	ret = rds_rdma_listen_init_common(rds_rdma_cm_event_handler,
					  (struct sockaddr *)&sin,
					  &rds_rdma_listen_id);
	if (ret != 0)
		return ret;

#if IS_ENABLED(CONFIG_IPV6)
	sin6.sin6_family = PF_INET6;
	sin6.sin6_addr = in6addr_any;
	sin6.sin6_port = htons(RDS_CM_PORT);
	sin6.sin6_scope_id = 0;
	sin6.sin6_flowinfo = 0;
	ret = rds_rdma_listen_init_common(rds6_rdma_cm_event_handler,
					  (struct sockaddr *)&sin6,
					  &rds6_rdma_listen_id);
	/* Keep going even when IPv6 is not enabled in the system. */
	if (ret != 0)
		rdsdebug("Cannot set up IPv6 RDMA listener\n");
#endif
	return 0;
}

static void rds_rdma_listen_stop(void)
{
	if (rds_rdma_listen_id) {
		rdsdebug("cm %p\n", rds_rdma_listen_id);
		rdma_destroy_id(rds_rdma_listen_id);
		rds_rdma_listen_id = NULL;
	}
#if IS_ENABLED(CONFIG_IPV6)
	if (rds6_rdma_listen_id) {
		rdsdebug("cm %p\n", rds6_rdma_listen_id);
		rdma_destroy_id(rds6_rdma_listen_id);
		rds6_rdma_listen_id = NULL;
	}
#endif
}

static int rds_rdma_init(void)
{
	int ret;

	ret = rds_ib_init();
	if (ret)
		goto out;

	ret = rds_rdma_listen_init();
	if (ret)
		rds_ib_exit();
out:
	return ret;
}
module_init(rds_rdma_init);

static void rds_rdma_exit(void)
{
	/* stop listening first to ensure no new connections are attempted */
	rds_rdma_listen_stop();
	rds_ib_exit();
}
module_exit(rds_rdma_exit);

MODULE_AUTHOR("Oracle Corporation <rds-devel@oss.oracle.com>");
MODULE_DESCRIPTION("RDS: IB transport");
MODULE_LICENSE("Dual BSD/GPL");
Commit	Line	Data
55b7ed0b	1	/*
eee2fa6a	2	* Copyright (c) 2009, 2018 Oracle and/or its affiliates. All rights reserved.
55b7ed0b AG	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	*/
3a9a231d	33	#include <linux/module.h>
55b7ed0b AG	34	#include <rdma/rdma_cm.h>
55b7ed0b AG	35
0cb43965	36	#include "rds_single_path.h"
55b7ed0b	37	#include "rdma_transport.h"
ae05368a	38	#include "ib.h"
55b7ed0b	39
1e2b44e7	40	/* Global IPv4 and IPv6 RDS RDMA listener cm_id */
11bc9421	41	static struct rdma_cm_id *rds_rdma_listen_id;
e65d4d96	42	#if IS_ENABLED(CONFIG_IPV6)
1e2b44e7	43	static struct rdma_cm_id *rds6_rdma_listen_id;
e65d4d96	44	#endif
55b7ed0b	45
e0e6d062 ZY	46	/* Per IB specification 7.7.3, service level is a 4-bit field. */
	47	#define TOS_TO_SL(tos) ((tos) & 0xF)
	48
eee2fa6a KCP	49	static int rds_rdma_cm_event_handler_cmn(struct rdma_cm_id *cm_id,
	50	struct rdma_cm_event *event,
	51	bool isv6)
55b7ed0b AG	52	{
	53	/* this can be null in the listening path */
	54	struct rds_connection *conn = cm_id->context;
	55	struct rds_transport *trans;
	56	int ret = 0;
d021fabf SS	57	int *err;
d021fabf SS	58	u8 len;
55b7ed0b	59
59f740a6	60	rdsdebug("conn %p id %p handling event %u (%s)\n", conn, cm_id,
3c88f3dc	61	event->event, rdma_event_msg(event->event));
55b7ed0b	62
dcdede04	63	if (cm_id->device->node_type == RDMA_NODE_IB_CA)
55b7ed0b AG	64	trans = &rds_ib_transport;
	65
	66	/* Prevent shutdown from tearing down the connection
	67	* while we're executing. */
	68	if (conn) {
	69	mutex_lock(&conn->c_cm_lock);
	70
	71	/* If the connection is being shut down, bail out
	72	* right away. We return 0 so cm_id doesn't get
	73	* destroyed prematurely */
	74	if (rds_conn_state(conn) == RDS_CONN_DISCONNECTING) {
	75	/* Reject incoming connections while we're tearing
	76	* down an existing one. */
	77	if (event->event == RDMA_CM_EVENT_CONNECT_REQUEST)
	78	ret = 1;
	79	goto out;
	80	}
	81	}
	82
	83	switch (event->event) {
	84	case RDMA_CM_EVENT_CONNECT_REQUEST:
eee2fa6a	85	ret = trans->cm_handle_connect(cm_id, event, isv6);
55b7ed0b AG	86	break;
	87
	88	case RDMA_CM_EVENT_ADDR_RESOLVED:
fd261ce6	89	rdma_set_service_type(cm_id, conn->c_tos);
5aa54bd2	90	rdma_set_min_rnr_timer(cm_id, IB_RNR_TIMER_000_32);
55b7ed0b AG	91	/* XXX do we need to clean up if this fails? */
	92	ret = rdma_resolve_route(cm_id,
	93	RDS_RDMA_RESOLVE_TIMEOUT_MS);
	94	break;
	95
	96	case RDMA_CM_EVENT_ROUTE_RESOLVED:
ae05368a	97	/* Connection could have been dropped so make sure the
	98	* cm_id is valid before proceeding
	99	*/
	100	if (conn) {
	101	struct rds_ib_connection *ibic;
	102
	103	ibic = conn->c_transport_data;
e0e6d062 ZY	104	if (ibic && ibic->i_cm_id == cm_id) {
	105	cm_id->route.path_rec[0].sl =
	106	TOS_TO_SL(conn->c_tos);
eee2fa6a	107	ret = trans->cm_initiate_connect(cm_id, isv6);
e0e6d062	108	} else {
ae05368a	109	rds_conn_drop(conn);
e0e6d062	110	}
ae05368a	111	}
55b7ed0b AG	112	break;
	113
	114	case RDMA_CM_EVENT_ESTABLISHED:
c7ba50fe JJB	115	if (conn)
c7ba50fe JJB	116	trans->cm_connect_complete(conn, event);
55b7ed0b AG	117	break;
55b7ed0b AG	118
39384f04	119	case RDMA_CM_EVENT_REJECTED:
d021fabf SS	120	if (!conn)
	121	break;
	122	err = (int *)rdma_consumer_reject_data(cm_id, event, &len);
8c6166cf GR	123	if (!err \|\|
	124	(err && len >= sizeof(*err) &&
	125	((*err) <= RDS_RDMA_REJ_INCOMPAT))) {
d021fabf SS	126	pr_warn("RDS/RDMA: conn <%pI6c, %pI6c> rejected, dropping connection\n",
d021fabf SS	127	&conn->c_laddr, &conn->c_faddr);
dc205a8d SS	128
	129	if (!conn->c_tos)
	130	conn->c_proposed_version = RDS_PROTOCOL_COMPAT_VERSION;
	131
d021fabf SS	132	rds_conn_drop(conn);
d021fabf SS	133	}
39384f04 SW	134	rdsdebug("Connection rejected: %s\n",
39384f04 SW	135	rdma_reject_msg(cm_id, event->status));
d021fabf	136	break;
55b7ed0b AG	137	case RDMA_CM_EVENT_ADDR_ERROR:
	138	case RDMA_CM_EVENT_ROUTE_ERROR:
	139	case RDMA_CM_EVENT_CONNECT_ERROR:
	140	case RDMA_CM_EVENT_UNREACHABLE:
55b7ed0b AG	141	case RDMA_CM_EVENT_DEVICE_REMOVAL:
	142	case RDMA_CM_EVENT_ADDR_CHANGE:
	143	if (conn)
	144	rds_conn_drop(conn);
	145	break;
	146
	147	case RDMA_CM_EVENT_DISCONNECTED:
c7ba50fe JJB	148	if (!conn)
c7ba50fe JJB	149	break;
97069788	150	rdsdebug("DISCONNECT event - dropping connection "
eee2fa6a	151	"%pI6c->%pI6c\n", &conn->c_laddr,
55b7ed0b AG	152	&conn->c_faddr);
	153	rds_conn_drop(conn);
	154	break;
	155
37ea401e	156	case RDMA_CM_EVENT_TIMEWAIT_EXIT:
37ea401e	157	if (conn) {
eee2fa6a	158	pr_info("RDS: RDMA_CM_EVENT_TIMEWAIT_EXIT event: dropping connection %pI6c->%pI6c\n",
37ea401e	159	&conn->c_laddr, &conn->c_faddr);
	160	rds_conn_drop(conn);
	161	}
	162	break;
	163
55b7ed0b AG	164	default:
55b7ed0b AG	165	/* things like device disconnect? */
59f740a6	166	printk(KERN_ERR "RDS: unknown event %u (%s)!\n",
3c88f3dc	167	event->event, rdma_event_msg(event->event));
55b7ed0b AG	168	break;
	169	}
	170
	171	out:
	172	if (conn)
	173	mutex_unlock(&conn->c_cm_lock);
	174
59f740a6	175	rdsdebug("id %p event %u (%s) handling ret %d\n", cm_id, event->event,
3c88f3dc	176	rdma_event_msg(event->event), ret);
55b7ed0b AG	177
	178	return ret;
	179	}
	180
eee2fa6a KCP	181	int rds_rdma_cm_event_handler(struct rdma_cm_id *cm_id,
	182	struct rdma_cm_event *event)
	183	{
	184	return rds_rdma_cm_event_handler_cmn(cm_id, event, false);
	185	}
	186
e65d4d96	187	#if IS_ENABLED(CONFIG_IPV6)
1e2b44e7 KCP	188	int rds6_rdma_cm_event_handler(struct rdma_cm_id *cm_id,
	189	struct rdma_cm_event *event)
	190	{
	191	return rds_rdma_cm_event_handler_cmn(cm_id, event, true);
	192	}
e65d4d96	193	#endif
1e2b44e7	194
eee2fa6a KCP	195	static int rds_rdma_listen_init_common(rdma_cm_event_handler handler,
	196	struct sockaddr *sa,
	197	struct rdma_cm_id **ret_cm_id)
55b7ed0b	198	{
55b7ed0b AG	199	struct rdma_cm_id *cm_id;
	200	int ret;
	201
eee2fa6a	202	cm_id = rdma_create_id(&init_net, handler, NULL,
fa20105e	203	RDMA_PS_TCP, IB_QPT_RC);
55b7ed0b AG	204	if (IS_ERR(cm_id)) {
55b7ed0b AG	205	ret = PTR_ERR(cm_id);
92c330b9	206	printk(KERN_ERR "RDS/RDMA: failed to setup listener, "
55b7ed0b	207	"rdma_create_id() returned %d\n", ret);
24acc689	208	return ret;
55b7ed0b AG	209	}
55b7ed0b AG	210
55b7ed0b AG	211	/*
	212	* XXX I bet this binds the cm_id to a device. If we want to support
	213	* fail-over we'll have to take this into consideration.
	214	*/
eee2fa6a	215	ret = rdma_bind_addr(cm_id, sa);
55b7ed0b	216	if (ret) {
92c330b9	217	printk(KERN_ERR "RDS/RDMA: failed to setup listener, "
55b7ed0b AG	218	"rdma_bind_addr() returned %d\n", ret);
	219	goto out;
	220	}
	221
	222	ret = rdma_listen(cm_id, 128);
	223	if (ret) {
92c330b9	224	printk(KERN_ERR "RDS/RDMA: failed to setup listener, "
55b7ed0b AG	225	"rdma_listen() returned %d\n", ret);
	226	goto out;
	227	}
	228
	229	rdsdebug("cm %p listening on port %u\n", cm_id, RDS_PORT);
	230
eee2fa6a	231	*ret_cm_id = cm_id;
55b7ed0b AG	232	cm_id = NULL;
	233	out:
	234	if (cm_id)
	235	rdma_destroy_id(cm_id);
	236	return ret;
	237	}
	238
eee2fa6a KCP	239	/* Initialize the RDS RDMA listeners. We create two listeners for
	240	* compatibility reason. The one on RDS_PORT is used for IPv4
	241	* requests only. The one on RDS_CM_PORT is used for IPv6 requests
	242	* only. So only IPv6 enabled RDS module will communicate using this
	243	* port.
	244	*/
	245	static int rds_rdma_listen_init(void)
	246	{
	247	int ret;
e65d4d96	248	#if IS_ENABLED(CONFIG_IPV6)
1e2b44e7	249	struct sockaddr_in6 sin6;
e65d4d96	250	#endif
eee2fa6a KCP	251	struct sockaddr_in sin;
	252
	253	sin.sin_family = PF_INET;
	254	sin.sin_addr.s_addr = htonl(INADDR_ANY);
	255	sin.sin_port = htons(RDS_PORT);
	256	ret = rds_rdma_listen_init_common(rds_rdma_cm_event_handler,
	257	(struct sockaddr *)&sin,
	258	&rds_rdma_listen_id);
1e2b44e7 KCP	259	if (ret != 0)
	260	return ret;
	261
e65d4d96	262	#if IS_ENABLED(CONFIG_IPV6)
1e2b44e7 KCP	263	sin6.sin6_family = PF_INET6;
	264	sin6.sin6_addr = in6addr_any;
	265	sin6.sin6_port = htons(RDS_CM_PORT);
	266	sin6.sin6_scope_id = 0;
	267	sin6.sin6_flowinfo = 0;
	268	ret = rds_rdma_listen_init_common(rds6_rdma_cm_event_handler,
	269	(struct sockaddr *)&sin6,
	270	&rds6_rdma_listen_id);
	271	/* Keep going even when IPv6 is not enabled in the system. */
	272	if (ret != 0)
	273	rdsdebug("Cannot set up IPv6 RDMA listener\n");
e65d4d96	274	#endif
1e2b44e7	275	return 0;
eee2fa6a KCP	276	}
eee2fa6a KCP	277
55b7ed0b AG	278	static void rds_rdma_listen_stop(void)
55b7ed0b AG	279	{
11bc9421 AG	280	if (rds_rdma_listen_id) {
	281	rdsdebug("cm %p\n", rds_rdma_listen_id);
	282	rdma_destroy_id(rds_rdma_listen_id);
	283	rds_rdma_listen_id = NULL;
55b7ed0b	284	}
e65d4d96	285	#if IS_ENABLED(CONFIG_IPV6)
1e2b44e7 KCP	286	if (rds6_rdma_listen_id) {
	287	rdsdebug("cm %p\n", rds6_rdma_listen_id);
	288	rdma_destroy_id(rds6_rdma_listen_id);
	289	rds6_rdma_listen_id = NULL;
	290	}
e65d4d96	291	#endif
55b7ed0b AG	292	}
55b7ed0b AG	293
ff51bf84	294	static int rds_rdma_init(void)
55b7ed0b AG	295	{
	296	int ret;
	297
8d5d8a5f	298	ret = rds_ib_init();
55b7ed0b AG	299	if (ret)
	300	goto out;
	301
8d5d8a5f	302	ret = rds_rdma_listen_init();
55b7ed0b	303	if (ret)
8d5d8a5f	304	rds_ib_exit();
55b7ed0b AG	305	out:
	306	return ret;
	307	}
40d86609	308	module_init(rds_rdma_init);
55b7ed0b	309
ff51bf84	310	static void rds_rdma_exit(void)
55b7ed0b AG	311	{
	312	/* stop listening first to ensure no new connections are attempted */
	313	rds_rdma_listen_stop();
	314	rds_ib_exit();
55b7ed0b	315	}
40d86609 AG	316	module_exit(rds_rdma_exit);
	317
	318	MODULE_AUTHOR("Oracle Corporation <rds-devel@oss.oracle.com>");
dcdede04	319	MODULE_DESCRIPTION("RDS: IB transport");
40d86609	320	MODULE_LICENSE("Dual BSD/GPL");