[linux-2.6-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

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;

	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:
		/* 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)
				ret = trans->cm_initiate_connect(cm_id, isv6);
			else
				rds_conn_drop(conn);
		}
		break;

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

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