1/*
   2 * Copyright (c) 2005 Voltaire Inc.  All rights reserved.
   3 * Copyright (c) 2002-2005, Network Appliance, Inc. All rights reserved.
   4 * Copyright (c) 1999-2005, Mellanox Technologies, Inc. All rights reserved.
   5 * Copyright (c) 2005-2006 Intel Corporation.  All rights reserved.
   6 *
   7 * This software is available to you under a choice of one of two
   8 * licenses.  You may choose to be licensed under the terms of the GNU
   9 * General Public License (GPL) Version 2, available from the file
  10 * COPYING in the main directory of this source tree, or the
  11 * OpenIB.org BSD license below:
  12 *
  13 *     Redistribution and use in source and binary forms, with or
  14 *     without modification, are permitted provided that the following
  15 *     conditions are met:
  16 *
  17 *      - Redistributions of source code must retain the above
  18 *        copyright notice, this list of conditions and the following
  19 *        disclaimer.
  20 *
  21 *      - Redistributions in binary form must reproduce the above
  22 *        copyright notice, this list of conditions and the following
  23 *        disclaimer in the documentation and/or other materials
  24 *        provided with the distribution.
  25 *
  26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  27 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  29 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  30 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  31 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  32 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  33 * SOFTWARE.
  34 */
  35
  36#include <linux/completion.h>
  37#include <linux/in.h>
  38#include <linux/in6.h>
  39#include <linux/mutex.h>
  40#include <linux/random.h>
  41#include <linux/idr.h>
  42#include <linux/inetdevice.h>
  43#include <linux/slab.h>
 
 
  44
  45#include <net/tcp.h>
  46#include <net/ipv6.h>
  47
  48#include <rdma/rdma_cm.h>
  49#include <rdma/rdma_cm_ib.h>
  50#include <rdma/rdma_netlink.h>
 
  51#include <rdma/ib_cache.h>
  52#include <rdma/ib_cm.h>
  53#include <rdma/ib_sa.h>
  54#include <rdma/iw_cm.h>
  55
  56MODULE_AUTHOR("Sean Hefty");
  57MODULE_DESCRIPTION("Generic RDMA CM Agent");
  58MODULE_LICENSE("Dual BSD/GPL");
  59
  60#define CMA_CM_RESPONSE_TIMEOUT 20
  61#define CMA_MAX_CM_RETRIES 15
  62#define CMA_CM_MRA_SETTING (IB_CM_MRA_FLAG_DELAY | 24)
  63#define CMA_IBOE_PACKET_LIFETIME 18
  64
  65static void cma_add_one(struct ib_device *device);
  66static void cma_remove_one(struct ib_device *device);
  67
  68static struct ib_client cma_client = {
  69	.name   = "cma",
  70	.add    = cma_add_one,
  71	.remove = cma_remove_one
  72};
  73
  74static struct ib_sa_client sa_client;
  75static struct rdma_addr_client addr_client;
  76static LIST_HEAD(dev_list);
  77static LIST_HEAD(listen_any_list);
  78static DEFINE_MUTEX(lock);
  79static struct workqueue_struct *cma_wq;
  80static DEFINE_IDR(sdp_ps);
  81static DEFINE_IDR(tcp_ps);
  82static DEFINE_IDR(udp_ps);
  83static DEFINE_IDR(ipoib_ps);
 
  84
  85struct cma_device {
  86	struct list_head	list;
  87	struct ib_device	*device;
  88	struct completion	comp;
  89	atomic_t		refcount;
  90	struct list_head	id_list;
  91};
  92
  93struct rdma_bind_list {
  94	struct idr		*ps;
  95	struct hlist_head	owners;
  96	unsigned short		port;
  97};
  98
 
 
 
 
  99/*
 100 * Device removal can occur at anytime, so we need extra handling to
 101 * serialize notifying the user of device removal with other callbacks.
 102 * We do this by disabling removal notification while a callback is in process,
 103 * and reporting it after the callback completes.
 104 */
 105struct rdma_id_private {
 106	struct rdma_cm_id	id;
 107
 108	struct rdma_bind_list	*bind_list;
 109	struct hlist_node	node;
 110	struct list_head	list; /* listen_any_list or cma_device.list */
 111	struct list_head	listen_list; /* per device listens */
 112	struct cma_device	*cma_dev;
 113	struct list_head	mc_list;
 114
 115	int			internal_id;
 116	enum rdma_cm_state	state;
 117	spinlock_t		lock;
 118	struct mutex		qp_mutex;
 119
 120	struct completion	comp;
 121	atomic_t		refcount;
 122	struct mutex		handler_mutex;
 123
 124	int			backlog;
 125	int			timeout_ms;
 126	struct ib_sa_query	*query;
 127	int			query_id;
 128	union {
 129		struct ib_cm_id	*ib;
 130		struct iw_cm_id	*iw;
 131	} cm_id;
 132
 133	u32			seq_num;
 134	u32			qkey;
 135	u32			qp_num;
 136	pid_t			owner;
 
 137	u8			srq;
 138	u8			tos;
 139	u8			reuseaddr;
 
 140};
 141
 142struct cma_multicast {
 143	struct rdma_id_private *id_priv;
 144	union {
 145		struct ib_sa_multicast *ib;
 146	} multicast;
 147	struct list_head	list;
 148	void			*context;
 149	struct sockaddr_storage	addr;
 150	struct kref		mcref;
 151};
 152
 153struct cma_work {
 154	struct work_struct	work;
 155	struct rdma_id_private	*id;
 156	enum rdma_cm_state	old_state;
 157	enum rdma_cm_state	new_state;
 158	struct rdma_cm_event	event;
 159};
 160
 161struct cma_ndev_work {
 162	struct work_struct	work;
 163	struct rdma_id_private	*id;
 164	struct rdma_cm_event	event;
 165};
 166
 167struct iboe_mcast_work {
 168	struct work_struct	 work;
 169	struct rdma_id_private	*id;
 170	struct cma_multicast	*mc;
 171};
 172
 173union cma_ip_addr {
 174	struct in6_addr ip6;
 175	struct {
 176		__be32 pad[3];
 177		__be32 addr;
 178	} ip4;
 179};
 180
 181struct cma_hdr {
 182	u8 cma_version;
 183	u8 ip_version;	/* IP version: 7:4 */
 184	__be16 port;
 185	union cma_ip_addr src_addr;
 186	union cma_ip_addr dst_addr;
 187};
 188
 189struct sdp_hh {
 190	u8 bsdh[16];
 191	u8 sdp_version; /* Major version: 7:4 */
 192	u8 ip_version;	/* IP version: 7:4 */
 193	u8 sdp_specific1[10];
 194	__be16 port;
 195	__be16 sdp_specific2;
 196	union cma_ip_addr src_addr;
 197	union cma_ip_addr dst_addr;
 198};
 199
 200struct sdp_hah {
 201	u8 bsdh[16];
 202	u8 sdp_version;
 203};
 204
 205#define CMA_VERSION 0x00
 206#define SDP_MAJ_VERSION 0x2
 207
 208static int cma_comp(struct rdma_id_private *id_priv, enum rdma_cm_state comp)
 209{
 210	unsigned long flags;
 211	int ret;
 212
 213	spin_lock_irqsave(&id_priv->lock, flags);
 214	ret = (id_priv->state == comp);
 215	spin_unlock_irqrestore(&id_priv->lock, flags);
 216	return ret;
 217}
 218
 219static int cma_comp_exch(struct rdma_id_private *id_priv,
 220			 enum rdma_cm_state comp, enum rdma_cm_state exch)
 221{
 222	unsigned long flags;
 223	int ret;
 224
 225	spin_lock_irqsave(&id_priv->lock, flags);
 226	if ((ret = (id_priv->state == comp)))
 227		id_priv->state = exch;
 228	spin_unlock_irqrestore(&id_priv->lock, flags);
 229	return ret;
 230}
 231
 232static enum rdma_cm_state cma_exch(struct rdma_id_private *id_priv,
 233				   enum rdma_cm_state exch)
 234{
 235	unsigned long flags;
 236	enum rdma_cm_state old;
 237
 238	spin_lock_irqsave(&id_priv->lock, flags);
 239	old = id_priv->state;
 240	id_priv->state = exch;
 241	spin_unlock_irqrestore(&id_priv->lock, flags);
 242	return old;
 243}
 244
 245static inline u8 cma_get_ip_ver(struct cma_hdr *hdr)
 246{
 247	return hdr->ip_version >> 4;
 248}
 249
 250static inline void cma_set_ip_ver(struct cma_hdr *hdr, u8 ip_ver)
 251{
 252	hdr->ip_version = (ip_ver << 4) | (hdr->ip_version & 0xF);
 253}
 254
 255static inline u8 sdp_get_majv(u8 sdp_version)
 256{
 257	return sdp_version >> 4;
 258}
 259
 260static inline u8 sdp_get_ip_ver(struct sdp_hh *hh)
 261{
 262	return hh->ip_version >> 4;
 263}
 264
 265static inline void sdp_set_ip_ver(struct sdp_hh *hh, u8 ip_ver)
 266{
 267	hh->ip_version = (ip_ver << 4) | (hh->ip_version & 0xF);
 268}
 269
 270static void cma_attach_to_dev(struct rdma_id_private *id_priv,
 271			      struct cma_device *cma_dev)
 272{
 273	atomic_inc(&cma_dev->refcount);
 274	id_priv->cma_dev = cma_dev;
 275	id_priv->id.device = cma_dev->device;
 276	id_priv->id.route.addr.dev_addr.transport =
 277		rdma_node_get_transport(cma_dev->device->node_type);
 278	list_add_tail(&id_priv->list, &cma_dev->id_list);
 279}
 280
 281static inline void cma_deref_dev(struct cma_device *cma_dev)
 282{
 283	if (atomic_dec_and_test(&cma_dev->refcount))
 284		complete(&cma_dev->comp);
 285}
 286
 287static inline void release_mc(struct kref *kref)
 288{
 289	struct cma_multicast *mc = container_of(kref, struct cma_multicast, mcref);
 290
 291	kfree(mc->multicast.ib);
 292	kfree(mc);
 293}
 294
 295static void cma_release_dev(struct rdma_id_private *id_priv)
 296{
 297	mutex_lock(&lock);
 298	list_del(&id_priv->list);
 299	cma_deref_dev(id_priv->cma_dev);
 300	id_priv->cma_dev = NULL;
 301	mutex_unlock(&lock);
 302}
 303
 304static int cma_set_qkey(struct rdma_id_private *id_priv)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 305{
 306	struct ib_sa_mcmember_rec rec;
 307	int ret = 0;
 308
 309	if (id_priv->qkey)
 
 
 310		return 0;
 
 
 
 
 
 
 311
 312	switch (id_priv->id.ps) {
 313	case RDMA_PS_UDP:
 
 314		id_priv->qkey = RDMA_UDP_QKEY;
 315		break;
 316	case RDMA_PS_IPOIB:
 317		ib_addr_get_mgid(&id_priv->id.route.addr.dev_addr, &rec.mgid);
 318		ret = ib_sa_get_mcmember_rec(id_priv->id.device,
 319					     id_priv->id.port_num, &rec.mgid,
 320					     &rec);
 321		if (!ret)
 322			id_priv->qkey = be32_to_cpu(rec.qkey);
 323		break;
 324	default:
 325		break;
 326	}
 327	return ret;
 328}
 329
 330static int find_gid_port(struct ib_device *device, union ib_gid *gid, u8 port_num)
 331{
 332	int i;
 333	int err;
 334	struct ib_port_attr props;
 335	union ib_gid tmp;
 336
 337	err = ib_query_port(device, port_num, &props);
 338	if (err)
 339		return 1;
 340
 341	for (i = 0; i < props.gid_tbl_len; ++i) {
 342		err = ib_query_gid(device, port_num, i, &tmp);
 343		if (err)
 344			return 1;
 345		if (!memcmp(&tmp, gid, sizeof tmp))
 346			return 0;
 347	}
 348
 349	return -EAGAIN;
 350}
 351
 352static int cma_acquire_dev(struct rdma_id_private *id_priv)
 
 353{
 354	struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
 355	struct cma_device *cma_dev;
 356	union ib_gid gid, iboe_gid;
 357	int ret = -ENODEV;
 358	u8 port;
 359	enum rdma_link_layer dev_ll = dev_addr->dev_type == ARPHRD_INFINIBAND ?
 360		IB_LINK_LAYER_INFINIBAND : IB_LINK_LAYER_ETHERNET;
 361
 362	if (dev_ll != IB_LINK_LAYER_INFINIBAND &&
 363	    id_priv->id.ps == RDMA_PS_IPOIB)
 364		return -EINVAL;
 365
 366	mutex_lock(&lock);
 367	iboe_addr_get_sgid(dev_addr, &iboe_gid);
 
 
 368	memcpy(&gid, dev_addr->src_dev_addr +
 369	       rdma_addr_gid_offset(dev_addr), sizeof gid);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 370	list_for_each_entry(cma_dev, &dev_list, list) {
 371		for (port = 1; port <= cma_dev->device->phys_port_cnt; ++port) {
 
 
 
 
 372			if (rdma_port_get_link_layer(cma_dev->device, port) == dev_ll) {
 373				if (rdma_node_get_transport(cma_dev->device->node_type) == RDMA_TRANSPORT_IB &&
 374				    rdma_port_get_link_layer(cma_dev->device, port) == IB_LINK_LAYER_ETHERNET)
 375					ret = find_gid_port(cma_dev->device, &iboe_gid, port);
 376				else
 377					ret = find_gid_port(cma_dev->device, &gid, port);
 378
 379				if (!ret) {
 380					id_priv->id.port_num = port;
 381					goto out;
 382				} else if (ret == 1)
 383					break;
 384			}
 385		}
 386	}
 387
 388out:
 389	if (!ret)
 390		cma_attach_to_dev(id_priv, cma_dev);
 391
 392	mutex_unlock(&lock);
 393	return ret;
 394}
 395
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 396static void cma_deref_id(struct rdma_id_private *id_priv)
 397{
 398	if (atomic_dec_and_test(&id_priv->refcount))
 399		complete(&id_priv->comp);
 400}
 401
 402static int cma_disable_callback(struct rdma_id_private *id_priv,
 403				enum rdma_cm_state state)
 404{
 405	mutex_lock(&id_priv->handler_mutex);
 406	if (id_priv->state != state) {
 407		mutex_unlock(&id_priv->handler_mutex);
 408		return -EINVAL;
 409	}
 410	return 0;
 411}
 412
 413struct rdma_cm_id *rdma_create_id(rdma_cm_event_handler event_handler,
 414				  void *context, enum rdma_port_space ps,
 415				  enum ib_qp_type qp_type)
 416{
 417	struct rdma_id_private *id_priv;
 418
 419	id_priv = kzalloc(sizeof *id_priv, GFP_KERNEL);
 420	if (!id_priv)
 421		return ERR_PTR(-ENOMEM);
 422
 423	id_priv->owner = task_pid_nr(current);
 424	id_priv->state = RDMA_CM_IDLE;
 425	id_priv->id.context = context;
 426	id_priv->id.event_handler = event_handler;
 427	id_priv->id.ps = ps;
 428	id_priv->id.qp_type = qp_type;
 429	spin_lock_init(&id_priv->lock);
 430	mutex_init(&id_priv->qp_mutex);
 431	init_completion(&id_priv->comp);
 432	atomic_set(&id_priv->refcount, 1);
 433	mutex_init(&id_priv->handler_mutex);
 434	INIT_LIST_HEAD(&id_priv->listen_list);
 435	INIT_LIST_HEAD(&id_priv->mc_list);
 436	get_random_bytes(&id_priv->seq_num, sizeof id_priv->seq_num);
 437
 438	return &id_priv->id;
 439}
 440EXPORT_SYMBOL(rdma_create_id);
 441
 442static int cma_init_ud_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
 443{
 444	struct ib_qp_attr qp_attr;
 445	int qp_attr_mask, ret;
 446
 447	qp_attr.qp_state = IB_QPS_INIT;
 448	ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
 449	if (ret)
 450		return ret;
 451
 452	ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 453	if (ret)
 454		return ret;
 455
 456	qp_attr.qp_state = IB_QPS_RTR;
 457	ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE);
 458	if (ret)
 459		return ret;
 460
 461	qp_attr.qp_state = IB_QPS_RTS;
 462	qp_attr.sq_psn = 0;
 463	ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE | IB_QP_SQ_PSN);
 464
 465	return ret;
 466}
 467
 468static int cma_init_conn_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
 469{
 470	struct ib_qp_attr qp_attr;
 471	int qp_attr_mask, ret;
 472
 473	qp_attr.qp_state = IB_QPS_INIT;
 474	ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
 475	if (ret)
 476		return ret;
 477
 478	return ib_modify_qp(qp, &qp_attr, qp_attr_mask);
 479}
 480
 481int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd,
 482		   struct ib_qp_init_attr *qp_init_attr)
 483{
 484	struct rdma_id_private *id_priv;
 485	struct ib_qp *qp;
 486	int ret;
 487
 488	id_priv = container_of(id, struct rdma_id_private, id);
 489	if (id->device != pd->device)
 490		return -EINVAL;
 491
 492	qp = ib_create_qp(pd, qp_init_attr);
 493	if (IS_ERR(qp))
 494		return PTR_ERR(qp);
 495
 496	if (id->qp_type == IB_QPT_UD)
 497		ret = cma_init_ud_qp(id_priv, qp);
 498	else
 499		ret = cma_init_conn_qp(id_priv, qp);
 500	if (ret)
 501		goto err;
 502
 503	id->qp = qp;
 504	id_priv->qp_num = qp->qp_num;
 505	id_priv->srq = (qp->srq != NULL);
 506	return 0;
 507err:
 508	ib_destroy_qp(qp);
 509	return ret;
 510}
 511EXPORT_SYMBOL(rdma_create_qp);
 512
 513void rdma_destroy_qp(struct rdma_cm_id *id)
 514{
 515	struct rdma_id_private *id_priv;
 516
 517	id_priv = container_of(id, struct rdma_id_private, id);
 518	mutex_lock(&id_priv->qp_mutex);
 519	ib_destroy_qp(id_priv->id.qp);
 520	id_priv->id.qp = NULL;
 521	mutex_unlock(&id_priv->qp_mutex);
 522}
 523EXPORT_SYMBOL(rdma_destroy_qp);
 524
 525static int cma_modify_qp_rtr(struct rdma_id_private *id_priv,
 526			     struct rdma_conn_param *conn_param)
 527{
 528	struct ib_qp_attr qp_attr;
 529	int qp_attr_mask, ret;
 
 530
 531	mutex_lock(&id_priv->qp_mutex);
 532	if (!id_priv->id.qp) {
 533		ret = 0;
 534		goto out;
 535	}
 536
 537	/* Need to update QP attributes from default values. */
 538	qp_attr.qp_state = IB_QPS_INIT;
 539	ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
 540	if (ret)
 541		goto out;
 542
 543	ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
 544	if (ret)
 545		goto out;
 546
 547	qp_attr.qp_state = IB_QPS_RTR;
 548	ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
 549	if (ret)
 550		goto out;
 551
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 552	if (conn_param)
 553		qp_attr.max_dest_rd_atomic = conn_param->responder_resources;
 554	ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
 555out:
 556	mutex_unlock(&id_priv->qp_mutex);
 557	return ret;
 558}
 559
 560static int cma_modify_qp_rts(struct rdma_id_private *id_priv,
 561			     struct rdma_conn_param *conn_param)
 562{
 563	struct ib_qp_attr qp_attr;
 564	int qp_attr_mask, ret;
 565
 566	mutex_lock(&id_priv->qp_mutex);
 567	if (!id_priv->id.qp) {
 568		ret = 0;
 569		goto out;
 570	}
 571
 572	qp_attr.qp_state = IB_QPS_RTS;
 573	ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
 574	if (ret)
 575		goto out;
 576
 577	if (conn_param)
 578		qp_attr.max_rd_atomic = conn_param->initiator_depth;
 579	ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
 580out:
 581	mutex_unlock(&id_priv->qp_mutex);
 582	return ret;
 583}
 584
 585static int cma_modify_qp_err(struct rdma_id_private *id_priv)
 586{
 587	struct ib_qp_attr qp_attr;
 588	int ret;
 589
 590	mutex_lock(&id_priv->qp_mutex);
 591	if (!id_priv->id.qp) {
 592		ret = 0;
 593		goto out;
 594	}
 595
 596	qp_attr.qp_state = IB_QPS_ERR;
 597	ret = ib_modify_qp(id_priv->id.qp, &qp_attr, IB_QP_STATE);
 598out:
 599	mutex_unlock(&id_priv->qp_mutex);
 600	return ret;
 601}
 602
 603static int cma_ib_init_qp_attr(struct rdma_id_private *id_priv,
 604			       struct ib_qp_attr *qp_attr, int *qp_attr_mask)
 605{
 606	struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
 607	int ret;
 608	u16 pkey;
 609
 610	if (rdma_port_get_link_layer(id_priv->id.device, id_priv->id.port_num) ==
 611	    IB_LINK_LAYER_INFINIBAND)
 612		pkey = ib_addr_get_pkey(dev_addr);
 613	else
 614		pkey = 0xffff;
 615
 616	ret = ib_find_cached_pkey(id_priv->id.device, id_priv->id.port_num,
 617				  pkey, &qp_attr->pkey_index);
 618	if (ret)
 619		return ret;
 620
 621	qp_attr->port_num = id_priv->id.port_num;
 622	*qp_attr_mask = IB_QP_STATE | IB_QP_PKEY_INDEX | IB_QP_PORT;
 623
 624	if (id_priv->id.qp_type == IB_QPT_UD) {
 625		ret = cma_set_qkey(id_priv);
 626		if (ret)
 627			return ret;
 628
 629		qp_attr->qkey = id_priv->qkey;
 630		*qp_attr_mask |= IB_QP_QKEY;
 631	} else {
 632		qp_attr->qp_access_flags = 0;
 633		*qp_attr_mask |= IB_QP_ACCESS_FLAGS;
 634	}
 635	return 0;
 636}
 637
 638int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr,
 639		       int *qp_attr_mask)
 640{
 641	struct rdma_id_private *id_priv;
 642	int ret = 0;
 643
 644	id_priv = container_of(id, struct rdma_id_private, id);
 645	switch (rdma_node_get_transport(id_priv->id.device->node_type)) {
 646	case RDMA_TRANSPORT_IB:
 647		if (!id_priv->cm_id.ib || (id_priv->id.qp_type == IB_QPT_UD))
 648			ret = cma_ib_init_qp_attr(id_priv, qp_attr, qp_attr_mask);
 649		else
 650			ret = ib_cm_init_qp_attr(id_priv->cm_id.ib, qp_attr,
 651						 qp_attr_mask);
 
 652		if (qp_attr->qp_state == IB_QPS_RTR)
 653			qp_attr->rq_psn = id_priv->seq_num;
 654		break;
 655	case RDMA_TRANSPORT_IWARP:
 656		if (!id_priv->cm_id.iw) {
 657			qp_attr->qp_access_flags = 0;
 658			*qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS;
 659		} else
 660			ret = iw_cm_init_qp_attr(id_priv->cm_id.iw, qp_attr,
 661						 qp_attr_mask);
 662		break;
 663	default:
 664		ret = -ENOSYS;
 665		break;
 666	}
 667
 668	return ret;
 669}
 670EXPORT_SYMBOL(rdma_init_qp_attr);
 671
 672static inline int cma_zero_addr(struct sockaddr *addr)
 673{
 674	struct in6_addr *ip6;
 675
 676	if (addr->sa_family == AF_INET)
 677		return ipv4_is_zeronet(
 678			((struct sockaddr_in *)addr)->sin_addr.s_addr);
 679	else {
 680		ip6 = &((struct sockaddr_in6 *) addr)->sin6_addr;
 681		return (ip6->s6_addr32[0] | ip6->s6_addr32[1] |
 682			ip6->s6_addr32[2] | ip6->s6_addr32[3]) == 0;
 683	}
 684}
 685
 686static inline int cma_loopback_addr(struct sockaddr *addr)
 687{
 688	if (addr->sa_family == AF_INET)
 689		return ipv4_is_loopback(
 690			((struct sockaddr_in *) addr)->sin_addr.s_addr);
 691	else
 692		return ipv6_addr_loopback(
 693			&((struct sockaddr_in6 *) addr)->sin6_addr);
 
 
 
 
 694}
 695
 696static inline int cma_any_addr(struct sockaddr *addr)
 697{
 698	return cma_zero_addr(addr) || cma_loopback_addr(addr);
 699}
 700
 701static int cma_addr_cmp(struct sockaddr *src, struct sockaddr *dst)
 702{
 703	if (src->sa_family != dst->sa_family)
 704		return -1;
 705
 706	switch (src->sa_family) {
 707	case AF_INET:
 708		return ((struct sockaddr_in *) src)->sin_addr.s_addr !=
 709		       ((struct sockaddr_in *) dst)->sin_addr.s_addr;
 710	default:
 711		return ipv6_addr_cmp(&((struct sockaddr_in6 *) src)->sin6_addr,
 712				     &((struct sockaddr_in6 *) dst)->sin6_addr);
 
 
 
 713	}
 714}
 715
 716static inline __be16 cma_port(struct sockaddr *addr)
 717{
 718	if (addr->sa_family == AF_INET)
 
 
 
 719		return ((struct sockaddr_in *) addr)->sin_port;
 720	else
 721		return ((struct sockaddr_in6 *) addr)->sin6_port;
 
 
 
 
 
 
 
 722}
 723
 724static inline int cma_any_port(struct sockaddr *addr)
 725{
 726	return !cma_port(addr);
 727}
 728
 729static int cma_get_net_info(void *hdr, enum rdma_port_space ps,
 730			    u8 *ip_ver, __be16 *port,
 731			    union cma_ip_addr **src, union cma_ip_addr **dst)
 732{
 733	switch (ps) {
 734	case RDMA_PS_SDP:
 735		if (sdp_get_majv(((struct sdp_hh *) hdr)->sdp_version) !=
 736		    SDP_MAJ_VERSION)
 737			return -EINVAL;
 738
 739		*ip_ver	= sdp_get_ip_ver(hdr);
 740		*port	= ((struct sdp_hh *) hdr)->port;
 741		*src	= &((struct sdp_hh *) hdr)->src_addr;
 742		*dst	= &((struct sdp_hh *) hdr)->dst_addr;
 743		break;
 744	default:
 745		if (((struct cma_hdr *) hdr)->cma_version != CMA_VERSION)
 746			return -EINVAL;
 
 
 
 
 
 
 
 
 747
 748		*ip_ver	= cma_get_ip_ver(hdr);
 749		*port	= ((struct cma_hdr *) hdr)->port;
 750		*src	= &((struct cma_hdr *) hdr)->src_addr;
 751		*dst	= &((struct cma_hdr *) hdr)->dst_addr;
 752		break;
 753	}
 754
 755	if (*ip_ver != 4 && *ip_ver != 6)
 756		return -EINVAL;
 757	return 0;
 
 
 
 
 
 
 
 758}
 759
 760static void cma_save_net_info(struct rdma_addr *addr,
 761			      struct rdma_addr *listen_addr,
 762			      u8 ip_ver, __be16 port,
 763			      union cma_ip_addr *src, union cma_ip_addr *dst)
 764{
 765	struct sockaddr_in *listen4, *ip4;
 766	struct sockaddr_in6 *listen6, *ip6;
 767
 768	switch (ip_ver) {
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 769	case 4:
 770		listen4 = (struct sockaddr_in *) &listen_addr->src_addr;
 771		ip4 = (struct sockaddr_in *) &addr->src_addr;
 772		ip4->sin_family = listen4->sin_family;
 773		ip4->sin_addr.s_addr = dst->ip4.addr;
 774		ip4->sin_port = listen4->sin_port;
 775
 776		ip4 = (struct sockaddr_in *) &addr->dst_addr;
 777		ip4->sin_family = listen4->sin_family;
 778		ip4->sin_addr.s_addr = src->ip4.addr;
 779		ip4->sin_port = port;
 780		break;
 781	case 6:
 782		listen6 = (struct sockaddr_in6 *) &listen_addr->src_addr;
 783		ip6 = (struct sockaddr_in6 *) &addr->src_addr;
 784		ip6->sin6_family = listen6->sin6_family;
 785		ip6->sin6_addr = dst->ip6;
 786		ip6->sin6_port = listen6->sin6_port;
 787
 788		ip6 = (struct sockaddr_in6 *) &addr->dst_addr;
 789		ip6->sin6_family = listen6->sin6_family;
 790		ip6->sin6_addr = src->ip6;
 791		ip6->sin6_port = port;
 792		break;
 793	default:
 794		break;
 795	}
 
 796}
 797
 798static inline int cma_user_data_offset(enum rdma_port_space ps)
 799{
 800	switch (ps) {
 801	case RDMA_PS_SDP:
 802		return 0;
 803	default:
 804		return sizeof(struct cma_hdr);
 805	}
 806}
 807
 808static void cma_cancel_route(struct rdma_id_private *id_priv)
 809{
 810	switch (rdma_port_get_link_layer(id_priv->id.device, id_priv->id.port_num)) {
 811	case IB_LINK_LAYER_INFINIBAND:
 812		if (id_priv->query)
 813			ib_sa_cancel_query(id_priv->query_id, id_priv->query);
 814		break;
 815	default:
 816		break;
 817	}
 818}
 819
 820static void cma_cancel_listens(struct rdma_id_private *id_priv)
 821{
 822	struct rdma_id_private *dev_id_priv;
 823
 824	/*
 825	 * Remove from listen_any_list to prevent added devices from spawning
 826	 * additional listen requests.
 827	 */
 828	mutex_lock(&lock);
 829	list_del(&id_priv->list);
 830
 831	while (!list_empty(&id_priv->listen_list)) {
 832		dev_id_priv = list_entry(id_priv->listen_list.next,
 833					 struct rdma_id_private, listen_list);
 834		/* sync with device removal to avoid duplicate destruction */
 835		list_del_init(&dev_id_priv->list);
 836		list_del(&dev_id_priv->listen_list);
 837		mutex_unlock(&lock);
 838
 839		rdma_destroy_id(&dev_id_priv->id);
 840		mutex_lock(&lock);
 841	}
 842	mutex_unlock(&lock);
 843}
 844
 845static void cma_cancel_operation(struct rdma_id_private *id_priv,
 846				 enum rdma_cm_state state)
 847{
 848	switch (state) {
 849	case RDMA_CM_ADDR_QUERY:
 850		rdma_addr_cancel(&id_priv->id.route.addr.dev_addr);
 851		break;
 852	case RDMA_CM_ROUTE_QUERY:
 853		cma_cancel_route(id_priv);
 854		break;
 855	case RDMA_CM_LISTEN:
 856		if (cma_any_addr((struct sockaddr *) &id_priv->id.route.addr.src_addr)
 857				&& !id_priv->cma_dev)
 858			cma_cancel_listens(id_priv);
 859		break;
 860	default:
 861		break;
 862	}
 863}
 864
 865static void cma_release_port(struct rdma_id_private *id_priv)
 866{
 867	struct rdma_bind_list *bind_list = id_priv->bind_list;
 868
 869	if (!bind_list)
 870		return;
 871
 872	mutex_lock(&lock);
 873	hlist_del(&id_priv->node);
 874	if (hlist_empty(&bind_list->owners)) {
 875		idr_remove(bind_list->ps, bind_list->port);
 876		kfree(bind_list);
 877	}
 878	mutex_unlock(&lock);
 879}
 880
 881static void cma_leave_mc_groups(struct rdma_id_private *id_priv)
 882{
 883	struct cma_multicast *mc;
 884
 885	while (!list_empty(&id_priv->mc_list)) {
 886		mc = container_of(id_priv->mc_list.next,
 887				  struct cma_multicast, list);
 888		list_del(&mc->list);
 889		switch (rdma_port_get_link_layer(id_priv->cma_dev->device, id_priv->id.port_num)) {
 890		case IB_LINK_LAYER_INFINIBAND:
 891			ib_sa_free_multicast(mc->multicast.ib);
 892			kfree(mc);
 893			break;
 894		case IB_LINK_LAYER_ETHERNET:
 895			kref_put(&mc->mcref, release_mc);
 896			break;
 897		default:
 898			break;
 899		}
 900	}
 901}
 902
 903void rdma_destroy_id(struct rdma_cm_id *id)
 904{
 905	struct rdma_id_private *id_priv;
 906	enum rdma_cm_state state;
 907
 908	id_priv = container_of(id, struct rdma_id_private, id);
 909	state = cma_exch(id_priv, RDMA_CM_DESTROYING);
 910	cma_cancel_operation(id_priv, state);
 911
 912	/*
 913	 * Wait for any active callback to finish.  New callbacks will find
 914	 * the id_priv state set to destroying and abort.
 915	 */
 916	mutex_lock(&id_priv->handler_mutex);
 917	mutex_unlock(&id_priv->handler_mutex);
 918
 919	if (id_priv->cma_dev) {
 920		switch (rdma_node_get_transport(id_priv->id.device->node_type)) {
 921		case RDMA_TRANSPORT_IB:
 922			if (id_priv->cm_id.ib)
 923				ib_destroy_cm_id(id_priv->cm_id.ib);
 924			break;
 925		case RDMA_TRANSPORT_IWARP:
 926			if (id_priv->cm_id.iw)
 927				iw_destroy_cm_id(id_priv->cm_id.iw);
 928			break;
 929		default:
 930			break;
 931		}
 932		cma_leave_mc_groups(id_priv);
 933		cma_release_dev(id_priv);
 934	}
 935
 936	cma_release_port(id_priv);
 937	cma_deref_id(id_priv);
 938	wait_for_completion(&id_priv->comp);
 939
 940	if (id_priv->internal_id)
 941		cma_deref_id(id_priv->id.context);
 942
 943	kfree(id_priv->id.route.path_rec);
 944	kfree(id_priv);
 945}
 946EXPORT_SYMBOL(rdma_destroy_id);
 947
 948static int cma_rep_recv(struct rdma_id_private *id_priv)
 949{
 950	int ret;
 951
 952	ret = cma_modify_qp_rtr(id_priv, NULL);
 953	if (ret)
 954		goto reject;
 955
 956	ret = cma_modify_qp_rts(id_priv, NULL);
 957	if (ret)
 958		goto reject;
 959
 960	ret = ib_send_cm_rtu(id_priv->cm_id.ib, NULL, 0);
 961	if (ret)
 962		goto reject;
 963
 964	return 0;
 965reject:
 966	cma_modify_qp_err(id_priv);
 967	ib_send_cm_rej(id_priv->cm_id.ib, IB_CM_REJ_CONSUMER_DEFINED,
 968		       NULL, 0, NULL, 0);
 969	return ret;
 970}
 971
 972static int cma_verify_rep(struct rdma_id_private *id_priv, void *data)
 973{
 974	if (id_priv->id.ps == RDMA_PS_SDP &&
 975	    sdp_get_majv(((struct sdp_hah *) data)->sdp_version) !=
 976	    SDP_MAJ_VERSION)
 977		return -EINVAL;
 978
 979	return 0;
 980}
 981
 982static void cma_set_rep_event_data(struct rdma_cm_event *event,
 983				   struct ib_cm_rep_event_param *rep_data,
 984				   void *private_data)
 985{
 986	event->param.conn.private_data = private_data;
 987	event->param.conn.private_data_len = IB_CM_REP_PRIVATE_DATA_SIZE;
 988	event->param.conn.responder_resources = rep_data->responder_resources;
 989	event->param.conn.initiator_depth = rep_data->initiator_depth;
 990	event->param.conn.flow_control = rep_data->flow_control;
 991	event->param.conn.rnr_retry_count = rep_data->rnr_retry_count;
 992	event->param.conn.srq = rep_data->srq;
 993	event->param.conn.qp_num = rep_data->remote_qpn;
 994}
 995
 996static int cma_ib_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
 997{
 998	struct rdma_id_private *id_priv = cm_id->context;
 999	struct rdma_cm_event event;
1000	int ret = 0;
1001
1002	if ((ib_event->event != IB_CM_TIMEWAIT_EXIT &&
1003		cma_disable_callback(id_priv, RDMA_CM_CONNECT)) ||
1004	    (ib_event->event == IB_CM_TIMEWAIT_EXIT &&
1005		cma_disable_callback(id_priv, RDMA_CM_DISCONNECT)))
1006		return 0;
1007
1008	memset(&event, 0, sizeof event);
1009	switch (ib_event->event) {
1010	case IB_CM_REQ_ERROR:
1011	case IB_CM_REP_ERROR:
1012		event.event = RDMA_CM_EVENT_UNREACHABLE;
1013		event.status = -ETIMEDOUT;
1014		break;
1015	case IB_CM_REP_RECEIVED:
1016		event.status = cma_verify_rep(id_priv, ib_event->private_data);
1017		if (event.status)
1018			event.event = RDMA_CM_EVENT_CONNECT_ERROR;
1019		else if (id_priv->id.qp && id_priv->id.ps != RDMA_PS_SDP) {
1020			event.status = cma_rep_recv(id_priv);
1021			event.event = event.status ? RDMA_CM_EVENT_CONNECT_ERROR :
1022						     RDMA_CM_EVENT_ESTABLISHED;
1023		} else
1024			event.event = RDMA_CM_EVENT_CONNECT_RESPONSE;
 
1025		cma_set_rep_event_data(&event, &ib_event->param.rep_rcvd,
1026				       ib_event->private_data);
1027		break;
1028	case IB_CM_RTU_RECEIVED:
1029	case IB_CM_USER_ESTABLISHED:
1030		event.event = RDMA_CM_EVENT_ESTABLISHED;
1031		break;
1032	case IB_CM_DREQ_ERROR:
1033		event.status = -ETIMEDOUT; /* fall through */
1034	case IB_CM_DREQ_RECEIVED:
1035	case IB_CM_DREP_RECEIVED:
1036		if (!cma_comp_exch(id_priv, RDMA_CM_CONNECT,
1037				   RDMA_CM_DISCONNECT))
1038			goto out;
1039		event.event = RDMA_CM_EVENT_DISCONNECTED;
1040		break;
1041	case IB_CM_TIMEWAIT_EXIT:
1042		event.event = RDMA_CM_EVENT_TIMEWAIT_EXIT;
1043		break;
1044	case IB_CM_MRA_RECEIVED:
1045		/* ignore event */
1046		goto out;
1047	case IB_CM_REJ_RECEIVED:
1048		cma_modify_qp_err(id_priv);
1049		event.status = ib_event->param.rej_rcvd.reason;
1050		event.event = RDMA_CM_EVENT_REJECTED;
1051		event.param.conn.private_data = ib_event->private_data;
1052		event.param.conn.private_data_len = IB_CM_REJ_PRIVATE_DATA_SIZE;
1053		break;
1054	default:
1055		printk(KERN_ERR "RDMA CMA: unexpected IB CM event: %d\n",
1056		       ib_event->event);
1057		goto out;
1058	}
1059
1060	ret = id_priv->id.event_handler(&id_priv->id, &event);
1061	if (ret) {
1062		/* Destroy the CM ID by returning a non-zero value. */
1063		id_priv->cm_id.ib = NULL;
1064		cma_exch(id_priv, RDMA_CM_DESTROYING);
1065		mutex_unlock(&id_priv->handler_mutex);
1066		rdma_destroy_id(&id_priv->id);
1067		return ret;
1068	}
1069out:
1070	mutex_unlock(&id_priv->handler_mutex);
1071	return ret;
1072}
1073
1074static struct rdma_id_private *cma_new_conn_id(struct rdma_cm_id *listen_id,
1075					       struct ib_cm_event *ib_event)
1076{
1077	struct rdma_id_private *id_priv;
1078	struct rdma_cm_id *id;
1079	struct rdma_route *rt;
1080	union cma_ip_addr *src, *dst;
1081	__be16 port;
1082	u8 ip_ver;
1083	int ret;
1084
1085	if (cma_get_net_info(ib_event->private_data, listen_id->ps,
1086			     &ip_ver, &port, &src, &dst))
1087		return NULL;
1088
1089	id = rdma_create_id(listen_id->event_handler, listen_id->context,
1090			    listen_id->ps, ib_event->param.req_rcvd.qp_type);
1091	if (IS_ERR(id))
1092		return NULL;
1093
1094	cma_save_net_info(&id->route.addr, &listen_id->route.addr,
1095			  ip_ver, port, src, dst);
 
1096
1097	rt = &id->route;
1098	rt->num_paths = ib_event->param.req_rcvd.alternate_path ? 2 : 1;
1099	rt->path_rec = kmalloc(sizeof *rt->path_rec * rt->num_paths,
1100			       GFP_KERNEL);
1101	if (!rt->path_rec)
1102		goto err;
1103
1104	rt->path_rec[0] = *ib_event->param.req_rcvd.primary_path;
1105	if (rt->num_paths == 2)
1106		rt->path_rec[1] = *ib_event->param.req_rcvd.alternate_path;
1107
1108	if (cma_any_addr((struct sockaddr *) &rt->addr.src_addr)) {
1109		rt->addr.dev_addr.dev_type = ARPHRD_INFINIBAND;
1110		rdma_addr_set_sgid(&rt->addr.dev_addr, &rt->path_rec[0].sgid);
1111		ib_addr_set_pkey(&rt->addr.dev_addr, rt->path_rec[0].pkey);
1112	} else {
1113		ret = rdma_translate_ip((struct sockaddr *) &rt->addr.src_addr,
1114					&rt->addr.dev_addr);
1115		if (ret)
1116			goto err;
1117	}
1118	rdma_addr_set_dgid(&rt->addr.dev_addr, &rt->path_rec[0].dgid);
1119
1120	id_priv = container_of(id, struct rdma_id_private, id);
1121	id_priv->state = RDMA_CM_CONNECT;
1122	return id_priv;
1123
1124err:
1125	rdma_destroy_id(id);
1126	return NULL;
1127}
1128
1129static struct rdma_id_private *cma_new_udp_id(struct rdma_cm_id *listen_id,
1130					      struct ib_cm_event *ib_event)
1131{
1132	struct rdma_id_private *id_priv;
1133	struct rdma_cm_id *id;
1134	union cma_ip_addr *src, *dst;
1135	__be16 port;
1136	u8 ip_ver;
1137	int ret;
1138
1139	id = rdma_create_id(listen_id->event_handler, listen_id->context,
1140			    listen_id->ps, IB_QPT_UD);
1141	if (IS_ERR(id))
1142		return NULL;
1143
1144
1145	if (cma_get_net_info(ib_event->private_data, listen_id->ps,
1146			     &ip_ver, &port, &src, &dst))
1147		goto err;
1148
1149	cma_save_net_info(&id->route.addr, &listen_id->route.addr,
1150			  ip_ver, port, src, dst);
1151
1152	if (!cma_any_addr((struct sockaddr *) &id->route.addr.src_addr)) {
1153		ret = rdma_translate_ip((struct sockaddr *) &id->route.addr.src_addr,
1154					&id->route.addr.dev_addr);
1155		if (ret)
1156			goto err;
1157	}
1158
1159	id_priv = container_of(id, struct rdma_id_private, id);
1160	id_priv->state = RDMA_CM_CONNECT;
1161	return id_priv;
1162err:
1163	rdma_destroy_id(id);
1164	return NULL;
1165}
1166
1167static void cma_set_req_event_data(struct rdma_cm_event *event,
1168				   struct ib_cm_req_event_param *req_data,
1169				   void *private_data, int offset)
1170{
1171	event->param.conn.private_data = private_data + offset;
1172	event->param.conn.private_data_len = IB_CM_REQ_PRIVATE_DATA_SIZE - offset;
1173	event->param.conn.responder_resources = req_data->responder_resources;
1174	event->param.conn.initiator_depth = req_data->initiator_depth;
1175	event->param.conn.flow_control = req_data->flow_control;
1176	event->param.conn.retry_count = req_data->retry_count;
1177	event->param.conn.rnr_retry_count = req_data->rnr_retry_count;
1178	event->param.conn.srq = req_data->srq;
1179	event->param.conn.qp_num = req_data->remote_qpn;
1180}
1181
 
 
 
 
 
 
 
 
 
1182static int cma_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
1183{
1184	struct rdma_id_private *listen_id, *conn_id;
1185	struct rdma_cm_event event;
1186	int offset, ret;
1187
1188	listen_id = cm_id->context;
 
 
 
1189	if (cma_disable_callback(listen_id, RDMA_CM_LISTEN))
1190		return -ECONNABORTED;
1191
1192	memset(&event, 0, sizeof event);
1193	offset = cma_user_data_offset(listen_id->id.ps);
1194	event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
1195	if (listen_id->id.qp_type == IB_QPT_UD) {
1196		conn_id = cma_new_udp_id(&listen_id->id, ib_event);
1197		event.param.ud.private_data = ib_event->private_data + offset;
1198		event.param.ud.private_data_len =
1199				IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE - offset;
1200	} else {
1201		conn_id = cma_new_conn_id(&listen_id->id, ib_event);
1202		cma_set_req_event_data(&event, &ib_event->param.req_rcvd,
1203				       ib_event->private_data, offset);
1204	}
1205	if (!conn_id) {
1206		ret = -ENOMEM;
1207		goto out;
1208	}
1209
1210	mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
1211	ret = cma_acquire_dev(conn_id);
1212	if (ret)
1213		goto release_conn_id;
1214
1215	conn_id->cm_id.ib = cm_id;
1216	cm_id->context = conn_id;
1217	cm_id->cm_handler = cma_ib_handler;
1218
1219	/*
1220	 * Protect against the user destroying conn_id from another thread
1221	 * until we're done accessing it.
1222	 */
1223	atomic_inc(&conn_id->refcount);
1224	ret = conn_id->id.event_handler(&conn_id->id, &event);
1225	if (!ret) {
1226		/*
1227		 * Acquire mutex to prevent user executing rdma_destroy_id()
1228		 * while we're accessing the cm_id.
1229		 */
1230		mutex_lock(&lock);
1231		if (cma_comp(conn_id, RDMA_CM_CONNECT) && (conn_id->id.qp_type != IB_QPT_UD))
1232			ib_send_cm_mra(cm_id, CMA_CM_MRA_SETTING, NULL, 0);
1233		mutex_unlock(&lock);
1234		mutex_unlock(&conn_id->handler_mutex);
1235		cma_deref_id(conn_id);
1236		goto out;
1237	}
1238	cma_deref_id(conn_id);
 
1239
 
 
1240	/* Destroy the CM ID by returning a non-zero value. */
1241	conn_id->cm_id.ib = NULL;
1242
1243release_conn_id:
1244	cma_exch(conn_id, RDMA_CM_DESTROYING);
1245	mutex_unlock(&conn_id->handler_mutex);
1246	rdma_destroy_id(&conn_id->id);
1247
1248out:
1249	mutex_unlock(&listen_id->handler_mutex);
 
 
1250	return ret;
1251}
1252
1253static __be64 cma_get_service_id(enum rdma_port_space ps, struct sockaddr *addr)
1254{
1255	return cpu_to_be64(((u64)ps << 16) + be16_to_cpu(cma_port(addr)));
 
 
 
1256}
 
1257
1258static void cma_set_compare_data(enum rdma_port_space ps, struct sockaddr *addr,
1259				 struct ib_cm_compare_data *compare)
1260{
1261	struct cma_hdr *cma_data, *cma_mask;
1262	struct sdp_hh *sdp_data, *sdp_mask;
1263	__be32 ip4_addr;
1264	struct in6_addr ip6_addr;
1265
1266	memset(compare, 0, sizeof *compare);
1267	cma_data = (void *) compare->data;
1268	cma_mask = (void *) compare->mask;
1269	sdp_data = (void *) compare->data;
1270	sdp_mask = (void *) compare->mask;
1271
1272	switch (addr->sa_family) {
1273	case AF_INET:
1274		ip4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
1275		if (ps == RDMA_PS_SDP) {
1276			sdp_set_ip_ver(sdp_data, 4);
1277			sdp_set_ip_ver(sdp_mask, 0xF);
1278			sdp_data->dst_addr.ip4.addr = ip4_addr;
1279			sdp_mask->dst_addr.ip4.addr = htonl(~0);
1280		} else {
1281			cma_set_ip_ver(cma_data, 4);
1282			cma_set_ip_ver(cma_mask, 0xF);
1283			cma_data->dst_addr.ip4.addr = ip4_addr;
1284			cma_mask->dst_addr.ip4.addr = htonl(~0);
1285		}
1286		break;
1287	case AF_INET6:
1288		ip6_addr = ((struct sockaddr_in6 *) addr)->sin6_addr;
1289		if (ps == RDMA_PS_SDP) {
1290			sdp_set_ip_ver(sdp_data, 6);
1291			sdp_set_ip_ver(sdp_mask, 0xF);
1292			sdp_data->dst_addr.ip6 = ip6_addr;
1293			memset(&sdp_mask->dst_addr.ip6, 0xFF,
1294			       sizeof sdp_mask->dst_addr.ip6);
1295		} else {
1296			cma_set_ip_ver(cma_data, 6);
1297			cma_set_ip_ver(cma_mask, 0xF);
1298			cma_data->dst_addr.ip6 = ip6_addr;
1299			memset(&cma_mask->dst_addr.ip6, 0xFF,
1300			       sizeof cma_mask->dst_addr.ip6);
1301		}
1302		break;
1303	default:
1304		break;
1305	}
1306}
1307
1308static int cma_iw_handler(struct iw_cm_id *iw_id, struct iw_cm_event *iw_event)
1309{
1310	struct rdma_id_private *id_priv = iw_id->context;
1311	struct rdma_cm_event event;
1312	struct sockaddr_in *sin;
1313	int ret = 0;
 
 
1314
1315	if (cma_disable_callback(id_priv, RDMA_CM_CONNECT))
1316		return 0;
1317
1318	memset(&event, 0, sizeof event);
1319	switch (iw_event->event) {
1320	case IW_CM_EVENT_CLOSE:
1321		event.event = RDMA_CM_EVENT_DISCONNECTED;
1322		break;
1323	case IW_CM_EVENT_CONNECT_REPLY:
1324		sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
1325		*sin = iw_event->local_addr;
1326		sin = (struct sockaddr_in *) &id_priv->id.route.addr.dst_addr;
1327		*sin = iw_event->remote_addr;
1328		switch (iw_event->status) {
1329		case 0:
1330			event.event = RDMA_CM_EVENT_ESTABLISHED;
 
 
1331			break;
1332		case -ECONNRESET:
1333		case -ECONNREFUSED:
1334			event.event = RDMA_CM_EVENT_REJECTED;
1335			break;
1336		case -ETIMEDOUT:
1337			event.event = RDMA_CM_EVENT_UNREACHABLE;
1338			break;
1339		default:
1340			event.event = RDMA_CM_EVENT_CONNECT_ERROR;
1341			break;
1342		}
1343		break;
1344	case IW_CM_EVENT_ESTABLISHED:
1345		event.event = RDMA_CM_EVENT_ESTABLISHED;
 
 
1346		break;
1347	default:
1348		BUG_ON(1);
1349	}
1350
1351	event.status = iw_event->status;
1352	event.param.conn.private_data = iw_event->private_data;
1353	event.param.conn.private_data_len = iw_event->private_data_len;
1354	ret = id_priv->id.event_handler(&id_priv->id, &event);
1355	if (ret) {
1356		/* Destroy the CM ID by returning a non-zero value. */
1357		id_priv->cm_id.iw = NULL;
1358		cma_exch(id_priv, RDMA_CM_DESTROYING);
1359		mutex_unlock(&id_priv->handler_mutex);
1360		rdma_destroy_id(&id_priv->id);
1361		return ret;
1362	}
1363
1364	mutex_unlock(&id_priv->handler_mutex);
1365	return ret;
1366}
1367
1368static int iw_conn_req_handler(struct iw_cm_id *cm_id,
1369			       struct iw_cm_event *iw_event)
1370{
1371	struct rdma_cm_id *new_cm_id;
1372	struct rdma_id_private *listen_id, *conn_id;
1373	struct sockaddr_in *sin;
1374	struct net_device *dev = NULL;
1375	struct rdma_cm_event event;
1376	int ret;
1377	struct ib_device_attr attr;
 
 
1378
1379	listen_id = cm_id->context;
1380	if (cma_disable_callback(listen_id, RDMA_CM_LISTEN))
1381		return -ECONNABORTED;
1382
1383	/* Create a new RDMA id for the new IW CM ID */
1384	new_cm_id = rdma_create_id(listen_id->id.event_handler,
1385				   listen_id->id.context,
1386				   RDMA_PS_TCP, IB_QPT_RC);
1387	if (IS_ERR(new_cm_id)) {
1388		ret = -ENOMEM;
1389		goto out;
1390	}
1391	conn_id = container_of(new_cm_id, struct rdma_id_private, id);
1392	mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
1393	conn_id->state = RDMA_CM_CONNECT;
1394
1395	dev = ip_dev_find(&init_net, iw_event->local_addr.sin_addr.s_addr);
1396	if (!dev) {
1397		ret = -EADDRNOTAVAIL;
1398		mutex_unlock(&conn_id->handler_mutex);
1399		rdma_destroy_id(new_cm_id);
1400		goto out;
1401	}
1402	ret = rdma_copy_addr(&conn_id->id.route.addr.dev_addr, dev, NULL);
1403	if (ret) {
1404		mutex_unlock(&conn_id->handler_mutex);
1405		rdma_destroy_id(new_cm_id);
1406		goto out;
1407	}
1408
1409	ret = cma_acquire_dev(conn_id);
1410	if (ret) {
1411		mutex_unlock(&conn_id->handler_mutex);
1412		rdma_destroy_id(new_cm_id);
1413		goto out;
1414	}
1415
1416	conn_id->cm_id.iw = cm_id;
1417	cm_id->context = conn_id;
1418	cm_id->cm_handler = cma_iw_handler;
1419
1420	sin = (struct sockaddr_in *) &new_cm_id->route.addr.src_addr;
1421	*sin = iw_event->local_addr;
1422	sin = (struct sockaddr_in *) &new_cm_id->route.addr.dst_addr;
1423	*sin = iw_event->remote_addr;
1424
1425	ret = ib_query_device(conn_id->id.device, &attr);
1426	if (ret) {
1427		mutex_unlock(&conn_id->handler_mutex);
1428		rdma_destroy_id(new_cm_id);
1429		goto out;
1430	}
1431
1432	memset(&event, 0, sizeof event);
1433	event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
1434	event.param.conn.private_data = iw_event->private_data;
1435	event.param.conn.private_data_len = iw_event->private_data_len;
1436	event.param.conn.initiator_depth = attr.max_qp_init_rd_atom;
1437	event.param.conn.responder_resources = attr.max_qp_rd_atom;
1438
1439	/*
1440	 * Protect against the user destroying conn_id from another thread
1441	 * until we're done accessing it.
1442	 */
1443	atomic_inc(&conn_id->refcount);
1444	ret = conn_id->id.event_handler(&conn_id->id, &event);
1445	if (ret) {
1446		/* User wants to destroy the CM ID */
1447		conn_id->cm_id.iw = NULL;
1448		cma_exch(conn_id, RDMA_CM_DESTROYING);
1449		mutex_unlock(&conn_id->handler_mutex);
1450		cma_deref_id(conn_id);
1451		rdma_destroy_id(&conn_id->id);
1452		goto out;
1453	}
1454
1455	mutex_unlock(&conn_id->handler_mutex);
1456	cma_deref_id(conn_id);
1457
1458out:
1459	if (dev)
1460		dev_put(dev);
1461	mutex_unlock(&listen_id->handler_mutex);
1462	return ret;
1463}
1464
1465static int cma_ib_listen(struct rdma_id_private *id_priv)
1466{
1467	struct ib_cm_compare_data compare_data;
1468	struct sockaddr *addr;
1469	struct ib_cm_id	*id;
1470	__be64 svc_id;
1471	int ret;
1472
1473	id = ib_create_cm_id(id_priv->id.device, cma_req_handler, id_priv);
1474	if (IS_ERR(id))
1475		return PTR_ERR(id);
1476
1477	id_priv->cm_id.ib = id;
1478
1479	addr = (struct sockaddr *) &id_priv->id.route.addr.src_addr;
1480	svc_id = cma_get_service_id(id_priv->id.ps, addr);
1481	if (cma_any_addr(addr))
1482		ret = ib_cm_listen(id_priv->cm_id.ib, svc_id, 0, NULL);
1483	else {
1484		cma_set_compare_data(id_priv->id.ps, addr, &compare_data);
1485		ret = ib_cm_listen(id_priv->cm_id.ib, svc_id, 0, &compare_data);
1486	}
1487
1488	if (ret) {
1489		ib_destroy_cm_id(id_priv->cm_id.ib);
1490		id_priv->cm_id.ib = NULL;
1491	}
1492
1493	return ret;
1494}
1495
1496static int cma_iw_listen(struct rdma_id_private *id_priv, int backlog)
1497{
1498	int ret;
1499	struct sockaddr_in *sin;
1500	struct iw_cm_id	*id;
1501
1502	id = iw_create_cm_id(id_priv->id.device,
1503			     iw_conn_req_handler,
1504			     id_priv);
1505	if (IS_ERR(id))
1506		return PTR_ERR(id);
1507
1508	id_priv->cm_id.iw = id;
1509
1510	sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
1511	id_priv->cm_id.iw->local_addr = *sin;
1512
1513	ret = iw_cm_listen(id_priv->cm_id.iw, backlog);
1514
1515	if (ret) {
1516		iw_destroy_cm_id(id_priv->cm_id.iw);
1517		id_priv->cm_id.iw = NULL;
1518	}
1519
1520	return ret;
1521}
1522
1523static int cma_listen_handler(struct rdma_cm_id *id,
1524			      struct rdma_cm_event *event)
1525{
1526	struct rdma_id_private *id_priv = id->context;
1527
1528	id->context = id_priv->id.context;
1529	id->event_handler = id_priv->id.event_handler;
1530	return id_priv->id.event_handler(id, event);
1531}
1532
1533static void cma_listen_on_dev(struct rdma_id_private *id_priv,
1534			      struct cma_device *cma_dev)
1535{
1536	struct rdma_id_private *dev_id_priv;
1537	struct rdma_cm_id *id;
1538	int ret;
1539
 
 
 
 
1540	id = rdma_create_id(cma_listen_handler, id_priv, id_priv->id.ps,
1541			    id_priv->id.qp_type);
1542	if (IS_ERR(id))
1543		return;
1544
1545	dev_id_priv = container_of(id, struct rdma_id_private, id);
1546
1547	dev_id_priv->state = RDMA_CM_ADDR_BOUND;
1548	memcpy(&id->route.addr.src_addr, &id_priv->id.route.addr.src_addr,
1549	       ip_addr_size((struct sockaddr *) &id_priv->id.route.addr.src_addr));
1550
1551	cma_attach_to_dev(dev_id_priv, cma_dev);
1552	list_add_tail(&dev_id_priv->listen_list, &id_priv->listen_list);
1553	atomic_inc(&id_priv->refcount);
1554	dev_id_priv->internal_id = 1;
 
1555
1556	ret = rdma_listen(id, id_priv->backlog);
1557	if (ret)
1558		printk(KERN_WARNING "RDMA CMA: cma_listen_on_dev, error %d, "
1559		       "listening on device %s\n", ret, cma_dev->device->name);
1560}
1561
1562static void cma_listen_on_all(struct rdma_id_private *id_priv)
1563{
1564	struct cma_device *cma_dev;
1565
1566	mutex_lock(&lock);
1567	list_add_tail(&id_priv->list, &listen_any_list);
1568	list_for_each_entry(cma_dev, &dev_list, list)
1569		cma_listen_on_dev(id_priv, cma_dev);
1570	mutex_unlock(&lock);
1571}
1572
1573void rdma_set_service_type(struct rdma_cm_id *id, int tos)
1574{
1575	struct rdma_id_private *id_priv;
1576
1577	id_priv = container_of(id, struct rdma_id_private, id);
1578	id_priv->tos = (u8) tos;
1579}
1580EXPORT_SYMBOL(rdma_set_service_type);
1581
1582static void cma_query_handler(int status, struct ib_sa_path_rec *path_rec,
1583			      void *context)
1584{
1585	struct cma_work *work = context;
1586	struct rdma_route *route;
1587
1588	route = &work->id->id.route;
1589
1590	if (!status) {
1591		route->num_paths = 1;
1592		*route->path_rec = *path_rec;
1593	} else {
1594		work->old_state = RDMA_CM_ROUTE_QUERY;
1595		work->new_state = RDMA_CM_ADDR_RESOLVED;
1596		work->event.event = RDMA_CM_EVENT_ROUTE_ERROR;
1597		work->event.status = status;
1598	}
1599
1600	queue_work(cma_wq, &work->work);
1601}
1602
1603static int cma_query_ib_route(struct rdma_id_private *id_priv, int timeout_ms,
1604			      struct cma_work *work)
1605{
1606	struct rdma_addr *addr = &id_priv->id.route.addr;
1607	struct ib_sa_path_rec path_rec;
1608	ib_sa_comp_mask comp_mask;
1609	struct sockaddr_in6 *sin6;
 
1610
1611	memset(&path_rec, 0, sizeof path_rec);
1612	rdma_addr_get_sgid(&addr->dev_addr, &path_rec.sgid);
1613	rdma_addr_get_dgid(&addr->dev_addr, &path_rec.dgid);
1614	path_rec.pkey = cpu_to_be16(ib_addr_get_pkey(&addr->dev_addr));
1615	path_rec.numb_path = 1;
1616	path_rec.reversible = 1;
1617	path_rec.service_id = cma_get_service_id(id_priv->id.ps,
1618							(struct sockaddr *) &addr->dst_addr);
1619
1620	comp_mask = IB_SA_PATH_REC_DGID | IB_SA_PATH_REC_SGID |
1621		    IB_SA_PATH_REC_PKEY | IB_SA_PATH_REC_NUMB_PATH |
1622		    IB_SA_PATH_REC_REVERSIBLE | IB_SA_PATH_REC_SERVICE_ID;
1623
1624	if (addr->src_addr.ss_family == AF_INET) {
 
1625		path_rec.qos_class = cpu_to_be16((u16) id_priv->tos);
1626		comp_mask |= IB_SA_PATH_REC_QOS_CLASS;
1627	} else {
1628		sin6 = (struct sockaddr_in6 *) &addr->src_addr;
 
1629		path_rec.traffic_class = (u8) (be32_to_cpu(sin6->sin6_flowinfo) >> 20);
1630		comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS;
 
 
 
 
 
 
1631	}
1632
1633	id_priv->query_id = ib_sa_path_rec_get(&sa_client, id_priv->id.device,
1634					       id_priv->id.port_num, &path_rec,
1635					       comp_mask, timeout_ms,
1636					       GFP_KERNEL, cma_query_handler,
1637					       work, &id_priv->query);
1638
1639	return (id_priv->query_id < 0) ? id_priv->query_id : 0;
1640}
1641
1642static void cma_work_handler(struct work_struct *_work)
1643{
1644	struct cma_work *work = container_of(_work, struct cma_work, work);
1645	struct rdma_id_private *id_priv = work->id;
1646	int destroy = 0;
1647
1648	mutex_lock(&id_priv->handler_mutex);
1649	if (!cma_comp_exch(id_priv, work->old_state, work->new_state))
1650		goto out;
1651
1652	if (id_priv->id.event_handler(&id_priv->id, &work->event)) {
1653		cma_exch(id_priv, RDMA_CM_DESTROYING);
1654		destroy = 1;
1655	}
1656out:
1657	mutex_unlock(&id_priv->handler_mutex);
1658	cma_deref_id(id_priv);
1659	if (destroy)
1660		rdma_destroy_id(&id_priv->id);
1661	kfree(work);
1662}
1663
1664static void cma_ndev_work_handler(struct work_struct *_work)
1665{
1666	struct cma_ndev_work *work = container_of(_work, struct cma_ndev_work, work);
1667	struct rdma_id_private *id_priv = work->id;
1668	int destroy = 0;
1669
1670	mutex_lock(&id_priv->handler_mutex);
1671	if (id_priv->state == RDMA_CM_DESTROYING ||
1672	    id_priv->state == RDMA_CM_DEVICE_REMOVAL)
1673		goto out;
1674
1675	if (id_priv->id.event_handler(&id_priv->id, &work->event)) {
1676		cma_exch(id_priv, RDMA_CM_DESTROYING);
1677		destroy = 1;
1678	}
1679
1680out:
1681	mutex_unlock(&id_priv->handler_mutex);
1682	cma_deref_id(id_priv);
1683	if (destroy)
1684		rdma_destroy_id(&id_priv->id);
1685	kfree(work);
1686}
1687
1688static int cma_resolve_ib_route(struct rdma_id_private *id_priv, int timeout_ms)
1689{
1690	struct rdma_route *route = &id_priv->id.route;
1691	struct cma_work *work;
1692	int ret;
1693
1694	work = kzalloc(sizeof *work, GFP_KERNEL);
1695	if (!work)
1696		return -ENOMEM;
1697
1698	work->id = id_priv;
1699	INIT_WORK(&work->work, cma_work_handler);
1700	work->old_state = RDMA_CM_ROUTE_QUERY;
1701	work->new_state = RDMA_CM_ROUTE_RESOLVED;
1702	work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
1703
1704	route->path_rec = kmalloc(sizeof *route->path_rec, GFP_KERNEL);
1705	if (!route->path_rec) {
1706		ret = -ENOMEM;
1707		goto err1;
1708	}
1709
1710	ret = cma_query_ib_route(id_priv, timeout_ms, work);
1711	if (ret)
1712		goto err2;
1713
1714	return 0;
1715err2:
1716	kfree(route->path_rec);
1717	route->path_rec = NULL;
1718err1:
1719	kfree(work);
1720	return ret;
1721}
1722
1723int rdma_set_ib_paths(struct rdma_cm_id *id,
1724		      struct ib_sa_path_rec *path_rec, int num_paths)
1725{
1726	struct rdma_id_private *id_priv;
1727	int ret;
1728
1729	id_priv = container_of(id, struct rdma_id_private, id);
1730	if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED,
1731			   RDMA_CM_ROUTE_RESOLVED))
1732		return -EINVAL;
1733
1734	id->route.path_rec = kmemdup(path_rec, sizeof *path_rec * num_paths,
1735				     GFP_KERNEL);
1736	if (!id->route.path_rec) {
1737		ret = -ENOMEM;
1738		goto err;
1739	}
1740
1741	id->route.num_paths = num_paths;
1742	return 0;
1743err:
1744	cma_comp_exch(id_priv, RDMA_CM_ROUTE_RESOLVED, RDMA_CM_ADDR_RESOLVED);
1745	return ret;
1746}
1747EXPORT_SYMBOL(rdma_set_ib_paths);
1748
1749static int cma_resolve_iw_route(struct rdma_id_private *id_priv, int timeout_ms)
1750{
1751	struct cma_work *work;
1752
1753	work = kzalloc(sizeof *work, GFP_KERNEL);
1754	if (!work)
1755		return -ENOMEM;
1756
1757	work->id = id_priv;
1758	INIT_WORK(&work->work, cma_work_handler);
1759	work->old_state = RDMA_CM_ROUTE_QUERY;
1760	work->new_state = RDMA_CM_ROUTE_RESOLVED;
1761	work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
1762	queue_work(cma_wq, &work->work);
1763	return 0;
1764}
1765
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1766static int cma_resolve_iboe_route(struct rdma_id_private *id_priv)
1767{
1768	struct rdma_route *route = &id_priv->id.route;
1769	struct rdma_addr *addr = &route->addr;
1770	struct cma_work *work;
1771	int ret;
1772	struct sockaddr_in *src_addr = (struct sockaddr_in *)&route->addr.src_addr;
1773	struct sockaddr_in *dst_addr = (struct sockaddr_in *)&route->addr.dst_addr;
1774	struct net_device *ndev = NULL;
1775	u16 vid;
1776
1777	if (src_addr->sin_family != dst_addr->sin_family)
1778		return -EINVAL;
1779
1780	work = kzalloc(sizeof *work, GFP_KERNEL);
1781	if (!work)
1782		return -ENOMEM;
1783
1784	work->id = id_priv;
1785	INIT_WORK(&work->work, cma_work_handler);
1786
1787	route->path_rec = kzalloc(sizeof *route->path_rec, GFP_KERNEL);
1788	if (!route->path_rec) {
1789		ret = -ENOMEM;
1790		goto err1;
1791	}
1792
1793	route->num_paths = 1;
1794
1795	if (addr->dev_addr.bound_dev_if)
1796		ndev = dev_get_by_index(&init_net, addr->dev_addr.bound_dev_if);
1797	if (!ndev) {
1798		ret = -ENODEV;
1799		goto err2;
1800	}
1801
1802	vid = rdma_vlan_dev_vlan_id(ndev);
1803
1804	iboe_mac_vlan_to_ll(&route->path_rec->sgid, addr->dev_addr.src_dev_addr, vid);
1805	iboe_mac_vlan_to_ll(&route->path_rec->dgid, addr->dev_addr.dst_dev_addr, vid);
 
 
 
 
1806
1807	route->path_rec->hop_limit = 1;
1808	route->path_rec->reversible = 1;
1809	route->path_rec->pkey = cpu_to_be16(0xffff);
1810	route->path_rec->mtu_selector = IB_SA_EQ;
1811	route->path_rec->sl = id_priv->tos >> 5;
1812
1813	route->path_rec->mtu = iboe_get_mtu(ndev->mtu);
1814	route->path_rec->rate_selector = IB_SA_EQ;
1815	route->path_rec->rate = iboe_get_rate(ndev);
1816	dev_put(ndev);
1817	route->path_rec->packet_life_time_selector = IB_SA_EQ;
1818	route->path_rec->packet_life_time = CMA_IBOE_PACKET_LIFETIME;
1819	if (!route->path_rec->mtu) {
1820		ret = -EINVAL;
1821		goto err2;
1822	}
1823
1824	work->old_state = RDMA_CM_ROUTE_QUERY;
1825	work->new_state = RDMA_CM_ROUTE_RESOLVED;
1826	work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
1827	work->event.status = 0;
1828
1829	queue_work(cma_wq, &work->work);
1830
1831	return 0;
1832
1833err2:
1834	kfree(route->path_rec);
1835	route->path_rec = NULL;
1836err1:
1837	kfree(work);
1838	return ret;
1839}
1840
1841int rdma_resolve_route(struct rdma_cm_id *id, int timeout_ms)
1842{
1843	struct rdma_id_private *id_priv;
1844	int ret;
1845
1846	id_priv = container_of(id, struct rdma_id_private, id);
1847	if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED, RDMA_CM_ROUTE_QUERY))
1848		return -EINVAL;
1849
1850	atomic_inc(&id_priv->refcount);
1851	switch (rdma_node_get_transport(id->device->node_type)) {
1852	case RDMA_TRANSPORT_IB:
1853		switch (rdma_port_get_link_layer(id->device, id->port_num)) {
1854		case IB_LINK_LAYER_INFINIBAND:
1855			ret = cma_resolve_ib_route(id_priv, timeout_ms);
1856			break;
1857		case IB_LINK_LAYER_ETHERNET:
1858			ret = cma_resolve_iboe_route(id_priv);
1859			break;
1860		default:
1861			ret = -ENOSYS;
1862		}
1863		break;
1864	case RDMA_TRANSPORT_IWARP:
1865		ret = cma_resolve_iw_route(id_priv, timeout_ms);
1866		break;
1867	default:
1868		ret = -ENOSYS;
1869		break;
1870	}
1871	if (ret)
1872		goto err;
1873
1874	return 0;
1875err:
1876	cma_comp_exch(id_priv, RDMA_CM_ROUTE_QUERY, RDMA_CM_ADDR_RESOLVED);
1877	cma_deref_id(id_priv);
1878	return ret;
1879}
1880EXPORT_SYMBOL(rdma_resolve_route);
1881
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1882static int cma_bind_loopback(struct rdma_id_private *id_priv)
1883{
1884	struct cma_device *cma_dev;
1885	struct ib_port_attr port_attr;
1886	union ib_gid gid;
1887	u16 pkey;
1888	int ret;
1889	u8 p;
1890
 
1891	mutex_lock(&lock);
1892	if (list_empty(&dev_list)) {
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1893		ret = -ENODEV;
1894		goto out;
1895	}
1896	list_for_each_entry(cma_dev, &dev_list, list)
1897		for (p = 1; p <= cma_dev->device->phys_port_cnt; ++p)
1898			if (!ib_query_port(cma_dev->device, p, &port_attr) &&
1899			    port_attr.state == IB_PORT_ACTIVE)
1900				goto port_found;
1901
1902	p = 1;
1903	cma_dev = list_entry(dev_list.next, struct cma_device, list);
1904
1905port_found:
1906	ret = ib_get_cached_gid(cma_dev->device, p, 0, &gid);
1907	if (ret)
1908		goto out;
1909
1910	ret = ib_get_cached_pkey(cma_dev->device, p, 0, &pkey);
1911	if (ret)
1912		goto out;
1913
1914	id_priv->id.route.addr.dev_addr.dev_type =
1915		(rdma_port_get_link_layer(cma_dev->device, p) == IB_LINK_LAYER_INFINIBAND) ?
1916		ARPHRD_INFINIBAND : ARPHRD_ETHER;
1917
1918	rdma_addr_set_sgid(&id_priv->id.route.addr.dev_addr, &gid);
1919	ib_addr_set_pkey(&id_priv->id.route.addr.dev_addr, pkey);
1920	id_priv->id.port_num = p;
1921	cma_attach_to_dev(id_priv, cma_dev);
 
1922out:
1923	mutex_unlock(&lock);
1924	return ret;
1925}
1926
1927static void addr_handler(int status, struct sockaddr *src_addr,
1928			 struct rdma_dev_addr *dev_addr, void *context)
1929{
1930	struct rdma_id_private *id_priv = context;
1931	struct rdma_cm_event event;
1932
1933	memset(&event, 0, sizeof event);
1934	mutex_lock(&id_priv->handler_mutex);
1935	if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY,
1936			   RDMA_CM_ADDR_RESOLVED))
1937		goto out;
1938
 
1939	if (!status && !id_priv->cma_dev)
1940		status = cma_acquire_dev(id_priv);
1941
1942	if (status) {
1943		if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED,
1944				   RDMA_CM_ADDR_BOUND))
1945			goto out;
1946		event.event = RDMA_CM_EVENT_ADDR_ERROR;
1947		event.status = status;
1948	} else {
1949		memcpy(&id_priv->id.route.addr.src_addr, src_addr,
1950		       ip_addr_size(src_addr));
1951		event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
1952	}
1953
1954	if (id_priv->id.event_handler(&id_priv->id, &event)) {
1955		cma_exch(id_priv, RDMA_CM_DESTROYING);
1956		mutex_unlock(&id_priv->handler_mutex);
1957		cma_deref_id(id_priv);
1958		rdma_destroy_id(&id_priv->id);
1959		return;
1960	}
1961out:
1962	mutex_unlock(&id_priv->handler_mutex);
1963	cma_deref_id(id_priv);
1964}
1965
1966static int cma_resolve_loopback(struct rdma_id_private *id_priv)
1967{
1968	struct cma_work *work;
1969	struct sockaddr *src, *dst;
1970	union ib_gid gid;
1971	int ret;
1972
1973	work = kzalloc(sizeof *work, GFP_KERNEL);
1974	if (!work)
1975		return -ENOMEM;
1976
1977	if (!id_priv->cma_dev) {
1978		ret = cma_bind_loopback(id_priv);
1979		if (ret)
1980			goto err;
1981	}
1982
1983	rdma_addr_get_sgid(&id_priv->id.route.addr.dev_addr, &gid);
1984	rdma_addr_set_dgid(&id_priv->id.route.addr.dev_addr, &gid);
1985
1986	src = (struct sockaddr *) &id_priv->id.route.addr.src_addr;
1987	if (cma_zero_addr(src)) {
1988		dst = (struct sockaddr *) &id_priv->id.route.addr.dst_addr;
1989		if ((src->sa_family = dst->sa_family) == AF_INET) {
1990			((struct sockaddr_in *) src)->sin_addr.s_addr =
1991				((struct sockaddr_in *) dst)->sin_addr.s_addr;
1992		} else {
1993			ipv6_addr_copy(&((struct sockaddr_in6 *) src)->sin6_addr,
1994				       &((struct sockaddr_in6 *) dst)->sin6_addr);
1995		}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1996	}
1997
 
 
 
1998	work->id = id_priv;
1999	INIT_WORK(&work->work, cma_work_handler);
2000	work->old_state = RDMA_CM_ADDR_QUERY;
2001	work->new_state = RDMA_CM_ADDR_RESOLVED;
2002	work->event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
2003	queue_work(cma_wq, &work->work);
2004	return 0;
2005err:
2006	kfree(work);
2007	return ret;
2008}
2009
2010static int cma_bind_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
2011			 struct sockaddr *dst_addr)
2012{
2013	if (!src_addr || !src_addr->sa_family) {
2014		src_addr = (struct sockaddr *) &id->route.addr.src_addr;
2015		if ((src_addr->sa_family = dst_addr->sa_family) == AF_INET6) {
 
2016			((struct sockaddr_in6 *) src_addr)->sin6_scope_id =
2017				((struct sockaddr_in6 *) dst_addr)->sin6_scope_id;
 
 
 
2018		}
2019	}
2020	return rdma_bind_addr(id, src_addr);
2021}
2022
2023int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
2024		      struct sockaddr *dst_addr, int timeout_ms)
2025{
2026	struct rdma_id_private *id_priv;
2027	int ret;
2028
2029	id_priv = container_of(id, struct rdma_id_private, id);
2030	if (id_priv->state == RDMA_CM_IDLE) {
2031		ret = cma_bind_addr(id, src_addr, dst_addr);
2032		if (ret)
2033			return ret;
2034	}
2035
 
 
 
2036	if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_ADDR_QUERY))
2037		return -EINVAL;
2038
2039	atomic_inc(&id_priv->refcount);
2040	memcpy(&id->route.addr.dst_addr, dst_addr, ip_addr_size(dst_addr));
2041	if (cma_any_addr(dst_addr))
2042		ret = cma_resolve_loopback(id_priv);
2043	else
2044		ret = rdma_resolve_ip(&addr_client, (struct sockaddr *) &id->route.addr.src_addr,
2045				      dst_addr, &id->route.addr.dev_addr,
2046				      timeout_ms, addr_handler, id_priv);
 
 
 
 
 
2047	if (ret)
2048		goto err;
2049
2050	return 0;
2051err:
2052	cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY, RDMA_CM_ADDR_BOUND);
2053	cma_deref_id(id_priv);
2054	return ret;
2055}
2056EXPORT_SYMBOL(rdma_resolve_addr);
2057
2058int rdma_set_reuseaddr(struct rdma_cm_id *id, int reuse)
2059{
2060	struct rdma_id_private *id_priv;
2061	unsigned long flags;
2062	int ret;
2063
2064	id_priv = container_of(id, struct rdma_id_private, id);
2065	spin_lock_irqsave(&id_priv->lock, flags);
2066	if (id_priv->state == RDMA_CM_IDLE) {
2067		id_priv->reuseaddr = reuse;
2068		ret = 0;
2069	} else {
2070		ret = -EINVAL;
2071	}
2072	spin_unlock_irqrestore(&id_priv->lock, flags);
2073	return ret;
2074}
2075EXPORT_SYMBOL(rdma_set_reuseaddr);
2076
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2077static void cma_bind_port(struct rdma_bind_list *bind_list,
2078			  struct rdma_id_private *id_priv)
2079{
2080	struct sockaddr_in *sin;
 
 
 
2081
2082	sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
2083	sin->sin_port = htons(bind_list->port);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2084	id_priv->bind_list = bind_list;
2085	hlist_add_head(&id_priv->node, &bind_list->owners);
2086}
2087
2088static int cma_alloc_port(struct idr *ps, struct rdma_id_private *id_priv,
2089			  unsigned short snum)
2090{
2091	struct rdma_bind_list *bind_list;
2092	int port, ret;
2093
2094	bind_list = kzalloc(sizeof *bind_list, GFP_KERNEL);
2095	if (!bind_list)
2096		return -ENOMEM;
2097
2098	do {
2099		ret = idr_get_new_above(ps, bind_list, snum, &port);
2100	} while ((ret == -EAGAIN) && idr_pre_get(ps, GFP_KERNEL));
2101
2102	if (ret)
2103		goto err1;
2104
2105	if (port != snum) {
2106		ret = -EADDRNOTAVAIL;
2107		goto err2;
2108	}
2109
2110	bind_list->ps = ps;
2111	bind_list->port = (unsigned short) port;
2112	cma_bind_port(bind_list, id_priv);
2113	return 0;
2114err2:
2115	idr_remove(ps, port);
2116err1:
2117	kfree(bind_list);
2118	return ret;
2119}
2120
2121static int cma_alloc_any_port(struct idr *ps, struct rdma_id_private *id_priv)
2122{
2123	static unsigned int last_used_port;
2124	int low, high, remaining;
2125	unsigned int rover;
2126
2127	inet_get_local_port_range(&low, &high);
2128	remaining = (high - low) + 1;
2129	rover = net_random() % remaining + low;
2130retry:
2131	if (last_used_port != rover &&
2132	    !idr_find(ps, (unsigned short) rover)) {
2133		int ret = cma_alloc_port(ps, id_priv, rover);
2134		/*
2135		 * Remember previously used port number in order to avoid
2136		 * re-using same port immediately after it is closed.
2137		 */
2138		if (!ret)
2139			last_used_port = rover;
2140		if (ret != -EADDRNOTAVAIL)
2141			return ret;
2142	}
2143	if (--remaining) {
2144		rover++;
2145		if ((rover < low) || (rover > high))
2146			rover = low;
2147		goto retry;
2148	}
2149	return -EADDRNOTAVAIL;
2150}
2151
2152/*
2153 * Check that the requested port is available.  This is called when trying to
2154 * bind to a specific port, or when trying to listen on a bound port.  In
2155 * the latter case, the provided id_priv may already be on the bind_list, but
2156 * we still need to check that it's okay to start listening.
2157 */
2158static int cma_check_port(struct rdma_bind_list *bind_list,
2159			  struct rdma_id_private *id_priv, uint8_t reuseaddr)
2160{
2161	struct rdma_id_private *cur_id;
2162	struct sockaddr *addr, *cur_addr;
2163	struct hlist_node *node;
2164
2165	addr = (struct sockaddr *) &id_priv->id.route.addr.src_addr;
2166	if (cma_any_addr(addr) && !reuseaddr)
2167		return -EADDRNOTAVAIL;
2168
2169	hlist_for_each_entry(cur_id, node, &bind_list->owners, node) {
2170		if (id_priv == cur_id)
2171			continue;
2172
2173		if ((cur_id->state == RDMA_CM_LISTEN) ||
2174		    !reuseaddr || !cur_id->reuseaddr) {
2175			cur_addr = (struct sockaddr *) &cur_id->id.route.addr.src_addr;
2176			if (cma_any_addr(cur_addr))
2177				return -EADDRNOTAVAIL;
2178
2179			if (!cma_addr_cmp(addr, cur_addr))
2180				return -EADDRINUSE;
2181		}
 
 
 
 
 
 
 
2182	}
2183	return 0;
2184}
2185
2186static int cma_use_port(struct idr *ps, struct rdma_id_private *id_priv)
2187{
2188	struct rdma_bind_list *bind_list;
2189	unsigned short snum;
2190	int ret;
2191
2192	snum = ntohs(cma_port((struct sockaddr *) &id_priv->id.route.addr.src_addr));
2193	if (snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
2194		return -EACCES;
2195
2196	bind_list = idr_find(ps, snum);
2197	if (!bind_list) {
2198		ret = cma_alloc_port(ps, id_priv, snum);
2199	} else {
2200		ret = cma_check_port(bind_list, id_priv, id_priv->reuseaddr);
2201		if (!ret)
2202			cma_bind_port(bind_list, id_priv);
2203	}
2204	return ret;
2205}
2206
2207static int cma_bind_listen(struct rdma_id_private *id_priv)
2208{
2209	struct rdma_bind_list *bind_list = id_priv->bind_list;
2210	int ret = 0;
2211
2212	mutex_lock(&lock);
2213	if (bind_list->owners.first->next)
2214		ret = cma_check_port(bind_list, id_priv, 0);
2215	mutex_unlock(&lock);
2216	return ret;
2217}
2218
2219static int cma_get_port(struct rdma_id_private *id_priv)
2220{
2221	struct idr *ps;
2222	int ret;
2223
2224	switch (id_priv->id.ps) {
2225	case RDMA_PS_SDP:
2226		ps = &sdp_ps;
2227		break;
2228	case RDMA_PS_TCP:
2229		ps = &tcp_ps;
2230		break;
2231	case RDMA_PS_UDP:
2232		ps = &udp_ps;
2233		break;
2234	case RDMA_PS_IPOIB:
2235		ps = &ipoib_ps;
2236		break;
 
2237	default:
2238		return -EPROTONOSUPPORT;
2239	}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2240
2241	mutex_lock(&lock);
2242	if (cma_any_port((struct sockaddr *) &id_priv->id.route.addr.src_addr))
2243		ret = cma_alloc_any_port(ps, id_priv);
2244	else
2245		ret = cma_use_port(ps, id_priv);
2246	mutex_unlock(&lock);
2247
2248	return ret;
2249}
2250
2251static int cma_check_linklocal(struct rdma_dev_addr *dev_addr,
2252			       struct sockaddr *addr)
2253{
2254#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2255	struct sockaddr_in6 *sin6;
2256
2257	if (addr->sa_family != AF_INET6)
2258		return 0;
2259
2260	sin6 = (struct sockaddr_in6 *) addr;
2261	if ((ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) &&
2262	    !sin6->sin6_scope_id)
 
 
 
2263			return -EINVAL;
2264
2265	dev_addr->bound_dev_if = sin6->sin6_scope_id;
2266#endif
2267	return 0;
2268}
2269
2270int rdma_listen(struct rdma_cm_id *id, int backlog)
2271{
2272	struct rdma_id_private *id_priv;
2273	int ret;
2274
2275	id_priv = container_of(id, struct rdma_id_private, id);
2276	if (id_priv->state == RDMA_CM_IDLE) {
2277		((struct sockaddr *) &id->route.addr.src_addr)->sa_family = AF_INET;
2278		ret = rdma_bind_addr(id, (struct sockaddr *) &id->route.addr.src_addr);
2279		if (ret)
2280			return ret;
2281	}
2282
2283	if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_LISTEN))
2284		return -EINVAL;
2285
2286	if (id_priv->reuseaddr) {
2287		ret = cma_bind_listen(id_priv);
2288		if (ret)
2289			goto err;
2290	}
2291
2292	id_priv->backlog = backlog;
2293	if (id->device) {
2294		switch (rdma_node_get_transport(id->device->node_type)) {
2295		case RDMA_TRANSPORT_IB:
2296			ret = cma_ib_listen(id_priv);
2297			if (ret)
2298				goto err;
2299			break;
2300		case RDMA_TRANSPORT_IWARP:
2301			ret = cma_iw_listen(id_priv, backlog);
2302			if (ret)
2303				goto err;
2304			break;
2305		default:
2306			ret = -ENOSYS;
2307			goto err;
2308		}
2309	} else
2310		cma_listen_on_all(id_priv);
2311
2312	return 0;
2313err:
2314	id_priv->backlog = 0;
2315	cma_comp_exch(id_priv, RDMA_CM_LISTEN, RDMA_CM_ADDR_BOUND);
2316	return ret;
2317}
2318EXPORT_SYMBOL(rdma_listen);
2319
2320int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr)
2321{
2322	struct rdma_id_private *id_priv;
2323	int ret;
2324
2325	if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6)
 
2326		return -EAFNOSUPPORT;
2327
2328	id_priv = container_of(id, struct rdma_id_private, id);
2329	if (!cma_comp_exch(id_priv, RDMA_CM_IDLE, RDMA_CM_ADDR_BOUND))
2330		return -EINVAL;
2331
2332	ret = cma_check_linklocal(&id->route.addr.dev_addr, addr);
2333	if (ret)
2334		goto err1;
2335
 
2336	if (!cma_any_addr(addr)) {
2337		ret = rdma_translate_ip(addr, &id->route.addr.dev_addr);
2338		if (ret)
2339			goto err1;
2340
2341		ret = cma_acquire_dev(id_priv);
2342		if (ret)
2343			goto err1;
2344	}
2345
2346	memcpy(&id->route.addr.src_addr, addr, ip_addr_size(addr));
 
 
 
 
 
 
 
2347	ret = cma_get_port(id_priv);
2348	if (ret)
2349		goto err2;
2350
2351	return 0;
2352err2:
2353	if (id_priv->cma_dev)
2354		cma_release_dev(id_priv);
2355err1:
2356	cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_IDLE);
2357	return ret;
2358}
2359EXPORT_SYMBOL(rdma_bind_addr);
2360
2361static int cma_format_hdr(void *hdr, enum rdma_port_space ps,
2362			  struct rdma_route *route)
2363{
2364	struct cma_hdr *cma_hdr;
2365	struct sdp_hh *sdp_hdr;
2366
2367	if (route->addr.src_addr.ss_family == AF_INET) {
 
 
2368		struct sockaddr_in *src4, *dst4;
2369
2370		src4 = (struct sockaddr_in *) &route->addr.src_addr;
2371		dst4 = (struct sockaddr_in *) &route->addr.dst_addr;
2372
2373		switch (ps) {
2374		case RDMA_PS_SDP:
2375			sdp_hdr = hdr;
2376			if (sdp_get_majv(sdp_hdr->sdp_version) != SDP_MAJ_VERSION)
2377				return -EINVAL;
2378			sdp_set_ip_ver(sdp_hdr, 4);
2379			sdp_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
2380			sdp_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
2381			sdp_hdr->port = src4->sin_port;
2382			break;
2383		default:
2384			cma_hdr = hdr;
2385			cma_hdr->cma_version = CMA_VERSION;
2386			cma_set_ip_ver(cma_hdr, 4);
2387			cma_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
2388			cma_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
2389			cma_hdr->port = src4->sin_port;
2390			break;
2391		}
2392	} else {
2393		struct sockaddr_in6 *src6, *dst6;
2394
2395		src6 = (struct sockaddr_in6 *) &route->addr.src_addr;
2396		dst6 = (struct sockaddr_in6 *) &route->addr.dst_addr;
2397
2398		switch (ps) {
2399		case RDMA_PS_SDP:
2400			sdp_hdr = hdr;
2401			if (sdp_get_majv(sdp_hdr->sdp_version) != SDP_MAJ_VERSION)
2402				return -EINVAL;
2403			sdp_set_ip_ver(sdp_hdr, 6);
2404			sdp_hdr->src_addr.ip6 = src6->sin6_addr;
2405			sdp_hdr->dst_addr.ip6 = dst6->sin6_addr;
2406			sdp_hdr->port = src6->sin6_port;
2407			break;
2408		default:
2409			cma_hdr = hdr;
2410			cma_hdr->cma_version = CMA_VERSION;
2411			cma_set_ip_ver(cma_hdr, 6);
2412			cma_hdr->src_addr.ip6 = src6->sin6_addr;
2413			cma_hdr->dst_addr.ip6 = dst6->sin6_addr;
2414			cma_hdr->port = src6->sin6_port;
2415			break;
2416		}
2417	}
2418	return 0;
2419}
2420
2421static int cma_sidr_rep_handler(struct ib_cm_id *cm_id,
2422				struct ib_cm_event *ib_event)
2423{
2424	struct rdma_id_private *id_priv = cm_id->context;
2425	struct rdma_cm_event event;
2426	struct ib_cm_sidr_rep_event_param *rep = &ib_event->param.sidr_rep_rcvd;
2427	int ret = 0;
2428
2429	if (cma_disable_callback(id_priv, RDMA_CM_CONNECT))
2430		return 0;
2431
2432	memset(&event, 0, sizeof event);
2433	switch (ib_event->event) {
2434	case IB_CM_SIDR_REQ_ERROR:
2435		event.event = RDMA_CM_EVENT_UNREACHABLE;
2436		event.status = -ETIMEDOUT;
2437		break;
2438	case IB_CM_SIDR_REP_RECEIVED:
2439		event.param.ud.private_data = ib_event->private_data;
2440		event.param.ud.private_data_len = IB_CM_SIDR_REP_PRIVATE_DATA_SIZE;
2441		if (rep->status != IB_SIDR_SUCCESS) {
2442			event.event = RDMA_CM_EVENT_UNREACHABLE;
2443			event.status = ib_event->param.sidr_rep_rcvd.status;
2444			break;
2445		}
2446		ret = cma_set_qkey(id_priv);
2447		if (ret) {
2448			event.event = RDMA_CM_EVENT_ADDR_ERROR;
2449			event.status = -EINVAL;
2450			break;
2451		}
2452		if (id_priv->qkey != rep->qkey) {
2453			event.event = RDMA_CM_EVENT_UNREACHABLE;
2454			event.status = -EINVAL;
2455			break;
2456		}
2457		ib_init_ah_from_path(id_priv->id.device, id_priv->id.port_num,
2458				     id_priv->id.route.path_rec,
2459				     &event.param.ud.ah_attr);
2460		event.param.ud.qp_num = rep->qpn;
2461		event.param.ud.qkey = rep->qkey;
2462		event.event = RDMA_CM_EVENT_ESTABLISHED;
2463		event.status = 0;
2464		break;
2465	default:
2466		printk(KERN_ERR "RDMA CMA: unexpected IB CM event: %d\n",
2467		       ib_event->event);
2468		goto out;
2469	}
2470
2471	ret = id_priv->id.event_handler(&id_priv->id, &event);
2472	if (ret) {
2473		/* Destroy the CM ID by returning a non-zero value. */
2474		id_priv->cm_id.ib = NULL;
2475		cma_exch(id_priv, RDMA_CM_DESTROYING);
2476		mutex_unlock(&id_priv->handler_mutex);
2477		rdma_destroy_id(&id_priv->id);
2478		return ret;
2479	}
2480out:
2481	mutex_unlock(&id_priv->handler_mutex);
2482	return ret;
2483}
2484
2485static int cma_resolve_ib_udp(struct rdma_id_private *id_priv,
2486			      struct rdma_conn_param *conn_param)
2487{
2488	struct ib_cm_sidr_req_param req;
2489	struct rdma_route *route;
2490	struct ib_cm_id	*id;
2491	int ret;
 
2492
2493	req.private_data_len = sizeof(struct cma_hdr) +
2494			       conn_param->private_data_len;
2495	req.private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
2496	if (!req.private_data)
2497		return -ENOMEM;
 
 
 
 
 
 
 
 
2498
2499	if (conn_param->private_data && conn_param->private_data_len)
2500		memcpy((void *) req.private_data + sizeof(struct cma_hdr),
2501		       conn_param->private_data, conn_param->private_data_len);
2502
2503	route = &id_priv->id.route;
2504	ret = cma_format_hdr((void *) req.private_data, id_priv->id.ps, route);
2505	if (ret)
2506		goto out;
 
 
2507
2508	id = ib_create_cm_id(id_priv->id.device, cma_sidr_rep_handler,
2509			     id_priv);
2510	if (IS_ERR(id)) {
2511		ret = PTR_ERR(id);
2512		goto out;
2513	}
2514	id_priv->cm_id.ib = id;
2515
2516	req.path = route->path_rec;
2517	req.service_id = cma_get_service_id(id_priv->id.ps,
2518					    (struct sockaddr *) &route->addr.dst_addr);
2519	req.timeout_ms = 1 << (CMA_CM_RESPONSE_TIMEOUT - 8);
2520	req.max_cm_retries = CMA_MAX_CM_RETRIES;
2521
2522	ret = ib_send_cm_sidr_req(id_priv->cm_id.ib, &req);
2523	if (ret) {
2524		ib_destroy_cm_id(id_priv->cm_id.ib);
2525		id_priv->cm_id.ib = NULL;
2526	}
2527out:
2528	kfree(req.private_data);
2529	return ret;
2530}
2531
2532static int cma_connect_ib(struct rdma_id_private *id_priv,
2533			  struct rdma_conn_param *conn_param)
2534{
2535	struct ib_cm_req_param req;
2536	struct rdma_route *route;
2537	void *private_data;
2538	struct ib_cm_id	*id;
2539	int offset, ret;
2540
2541	memset(&req, 0, sizeof req);
2542	offset = cma_user_data_offset(id_priv->id.ps);
2543	req.private_data_len = offset + conn_param->private_data_len;
2544	private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
2545	if (!private_data)
2546		return -ENOMEM;
 
 
 
 
 
 
 
2547
2548	if (conn_param->private_data && conn_param->private_data_len)
2549		memcpy(private_data + offset, conn_param->private_data,
2550		       conn_param->private_data_len);
2551
2552	id = ib_create_cm_id(id_priv->id.device, cma_ib_handler, id_priv);
2553	if (IS_ERR(id)) {
2554		ret = PTR_ERR(id);
2555		goto out;
2556	}
2557	id_priv->cm_id.ib = id;
2558
2559	route = &id_priv->id.route;
2560	ret = cma_format_hdr(private_data, id_priv->id.ps, route);
2561	if (ret)
2562		goto out;
2563	req.private_data = private_data;
 
 
2564
2565	req.primary_path = &route->path_rec[0];
2566	if (route->num_paths == 2)
2567		req.alternate_path = &route->path_rec[1];
2568
2569	req.service_id = cma_get_service_id(id_priv->id.ps,
2570					    (struct sockaddr *) &route->addr.dst_addr);
2571	req.qp_num = id_priv->qp_num;
2572	req.qp_type = IB_QPT_RC;
2573	req.starting_psn = id_priv->seq_num;
2574	req.responder_resources = conn_param->responder_resources;
2575	req.initiator_depth = conn_param->initiator_depth;
2576	req.flow_control = conn_param->flow_control;
2577	req.retry_count = conn_param->retry_count;
2578	req.rnr_retry_count = conn_param->rnr_retry_count;
2579	req.remote_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
2580	req.local_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
2581	req.max_cm_retries = CMA_MAX_CM_RETRIES;
2582	req.srq = id_priv->srq ? 1 : 0;
2583
2584	ret = ib_send_cm_req(id_priv->cm_id.ib, &req);
2585out:
2586	if (ret && !IS_ERR(id)) {
2587		ib_destroy_cm_id(id);
2588		id_priv->cm_id.ib = NULL;
2589	}
2590
2591	kfree(private_data);
2592	return ret;
2593}
2594
2595static int cma_connect_iw(struct rdma_id_private *id_priv,
2596			  struct rdma_conn_param *conn_param)
2597{
2598	struct iw_cm_id *cm_id;
2599	struct sockaddr_in* sin;
2600	int ret;
2601	struct iw_cm_conn_param iw_param;
2602
2603	cm_id = iw_create_cm_id(id_priv->id.device, cma_iw_handler, id_priv);
2604	if (IS_ERR(cm_id))
2605		return PTR_ERR(cm_id);
2606
2607	id_priv->cm_id.iw = cm_id;
2608
2609	sin = (struct sockaddr_in*) &id_priv->id.route.addr.src_addr;
2610	cm_id->local_addr = *sin;
2611
2612	sin = (struct sockaddr_in*) &id_priv->id.route.addr.dst_addr;
2613	cm_id->remote_addr = *sin;
2614
2615	ret = cma_modify_qp_rtr(id_priv, conn_param);
2616	if (ret)
2617		goto out;
2618
2619	iw_param.ord = conn_param->initiator_depth;
2620	iw_param.ird = conn_param->responder_resources;
2621	iw_param.private_data = conn_param->private_data;
2622	iw_param.private_data_len = conn_param->private_data_len;
2623	if (id_priv->id.qp)
 
 
 
2624		iw_param.qpn = id_priv->qp_num;
2625	else
2626		iw_param.qpn = conn_param->qp_num;
2627	ret = iw_cm_connect(cm_id, &iw_param);
2628out:
2629	if (ret) {
2630		iw_destroy_cm_id(cm_id);
2631		id_priv->cm_id.iw = NULL;
2632	}
2633	return ret;
2634}
2635
2636int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
2637{
2638	struct rdma_id_private *id_priv;
2639	int ret;
2640
2641	id_priv = container_of(id, struct rdma_id_private, id);
2642	if (!cma_comp_exch(id_priv, RDMA_CM_ROUTE_RESOLVED, RDMA_CM_CONNECT))
2643		return -EINVAL;
2644
2645	if (!id->qp) {
2646		id_priv->qp_num = conn_param->qp_num;
2647		id_priv->srq = conn_param->srq;
2648	}
2649
2650	switch (rdma_node_get_transport(id->device->node_type)) {
2651	case RDMA_TRANSPORT_IB:
2652		if (id->qp_type == IB_QPT_UD)
2653			ret = cma_resolve_ib_udp(id_priv, conn_param);
2654		else
2655			ret = cma_connect_ib(id_priv, conn_param);
2656		break;
2657	case RDMA_TRANSPORT_IWARP:
2658		ret = cma_connect_iw(id_priv, conn_param);
2659		break;
2660	default:
2661		ret = -ENOSYS;
2662		break;
2663	}
2664	if (ret)
2665		goto err;
2666
2667	return 0;
2668err:
2669	cma_comp_exch(id_priv, RDMA_CM_CONNECT, RDMA_CM_ROUTE_RESOLVED);
2670	return ret;
2671}
2672EXPORT_SYMBOL(rdma_connect);
2673
2674static int cma_accept_ib(struct rdma_id_private *id_priv,
2675			 struct rdma_conn_param *conn_param)
2676{
2677	struct ib_cm_rep_param rep;
2678	int ret;
2679
2680	ret = cma_modify_qp_rtr(id_priv, conn_param);
2681	if (ret)
2682		goto out;
2683
2684	ret = cma_modify_qp_rts(id_priv, conn_param);
2685	if (ret)
2686		goto out;
2687
2688	memset(&rep, 0, sizeof rep);
2689	rep.qp_num = id_priv->qp_num;
2690	rep.starting_psn = id_priv->seq_num;
2691	rep.private_data = conn_param->private_data;
2692	rep.private_data_len = conn_param->private_data_len;
2693	rep.responder_resources = conn_param->responder_resources;
2694	rep.initiator_depth = conn_param->initiator_depth;
2695	rep.failover_accepted = 0;
2696	rep.flow_control = conn_param->flow_control;
2697	rep.rnr_retry_count = conn_param->rnr_retry_count;
2698	rep.srq = id_priv->srq ? 1 : 0;
2699
2700	ret = ib_send_cm_rep(id_priv->cm_id.ib, &rep);
2701out:
2702	return ret;
2703}
2704
2705static int cma_accept_iw(struct rdma_id_private *id_priv,
2706		  struct rdma_conn_param *conn_param)
2707{
2708	struct iw_cm_conn_param iw_param;
2709	int ret;
2710
2711	ret = cma_modify_qp_rtr(id_priv, conn_param);
2712	if (ret)
2713		return ret;
2714
2715	iw_param.ord = conn_param->initiator_depth;
2716	iw_param.ird = conn_param->responder_resources;
2717	iw_param.private_data = conn_param->private_data;
2718	iw_param.private_data_len = conn_param->private_data_len;
2719	if (id_priv->id.qp) {
2720		iw_param.qpn = id_priv->qp_num;
2721	} else
2722		iw_param.qpn = conn_param->qp_num;
2723
2724	return iw_cm_accept(id_priv->cm_id.iw, &iw_param);
2725}
2726
2727static int cma_send_sidr_rep(struct rdma_id_private *id_priv,
2728			     enum ib_cm_sidr_status status,
2729			     const void *private_data, int private_data_len)
2730{
2731	struct ib_cm_sidr_rep_param rep;
2732	int ret;
2733
2734	memset(&rep, 0, sizeof rep);
2735	rep.status = status;
2736	if (status == IB_SIDR_SUCCESS) {
2737		ret = cma_set_qkey(id_priv);
2738		if (ret)
2739			return ret;
2740		rep.qp_num = id_priv->qp_num;
2741		rep.qkey = id_priv->qkey;
2742	}
2743	rep.private_data = private_data;
2744	rep.private_data_len = private_data_len;
2745
2746	return ib_send_cm_sidr_rep(id_priv->cm_id.ib, &rep);
2747}
2748
2749int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
2750{
2751	struct rdma_id_private *id_priv;
2752	int ret;
2753
2754	id_priv = container_of(id, struct rdma_id_private, id);
2755
2756	id_priv->owner = task_pid_nr(current);
2757
2758	if (!cma_comp(id_priv, RDMA_CM_CONNECT))
2759		return -EINVAL;
2760
2761	if (!id->qp && conn_param) {
2762		id_priv->qp_num = conn_param->qp_num;
2763		id_priv->srq = conn_param->srq;
2764	}
2765
2766	switch (rdma_node_get_transport(id->device->node_type)) {
2767	case RDMA_TRANSPORT_IB:
2768		if (id->qp_type == IB_QPT_UD)
2769			ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
2770						conn_param->private_data,
2771						conn_param->private_data_len);
2772		else if (conn_param)
2773			ret = cma_accept_ib(id_priv, conn_param);
2774		else
2775			ret = cma_rep_recv(id_priv);
 
 
 
 
 
 
 
2776		break;
2777	case RDMA_TRANSPORT_IWARP:
2778		ret = cma_accept_iw(id_priv, conn_param);
2779		break;
2780	default:
2781		ret = -ENOSYS;
2782		break;
2783	}
2784
2785	if (ret)
2786		goto reject;
2787
2788	return 0;
2789reject:
2790	cma_modify_qp_err(id_priv);
2791	rdma_reject(id, NULL, 0);
2792	return ret;
2793}
2794EXPORT_SYMBOL(rdma_accept);
2795
2796int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event)
2797{
2798	struct rdma_id_private *id_priv;
2799	int ret;
2800
2801	id_priv = container_of(id, struct rdma_id_private, id);
2802	if (!id_priv->cm_id.ib)
2803		return -EINVAL;
2804
2805	switch (id->device->node_type) {
2806	case RDMA_NODE_IB_CA:
2807		ret = ib_cm_notify(id_priv->cm_id.ib, event);
2808		break;
2809	default:
2810		ret = 0;
2811		break;
2812	}
2813	return ret;
2814}
2815EXPORT_SYMBOL(rdma_notify);
2816
2817int rdma_reject(struct rdma_cm_id *id, const void *private_data,
2818		u8 private_data_len)
2819{
2820	struct rdma_id_private *id_priv;
2821	int ret;
2822
2823	id_priv = container_of(id, struct rdma_id_private, id);
2824	if (!id_priv->cm_id.ib)
2825		return -EINVAL;
2826
2827	switch (rdma_node_get_transport(id->device->node_type)) {
2828	case RDMA_TRANSPORT_IB:
2829		if (id->qp_type == IB_QPT_UD)
2830			ret = cma_send_sidr_rep(id_priv, IB_SIDR_REJECT,
2831						private_data, private_data_len);
2832		else
2833			ret = ib_send_cm_rej(id_priv->cm_id.ib,
2834					     IB_CM_REJ_CONSUMER_DEFINED, NULL,
2835					     0, private_data, private_data_len);
2836		break;
2837	case RDMA_TRANSPORT_IWARP:
2838		ret = iw_cm_reject(id_priv->cm_id.iw,
2839				   private_data, private_data_len);
2840		break;
2841	default:
2842		ret = -ENOSYS;
2843		break;
2844	}
2845	return ret;
2846}
2847EXPORT_SYMBOL(rdma_reject);
2848
2849int rdma_disconnect(struct rdma_cm_id *id)
2850{
2851	struct rdma_id_private *id_priv;
2852	int ret;
2853
2854	id_priv = container_of(id, struct rdma_id_private, id);
2855	if (!id_priv->cm_id.ib)
2856		return -EINVAL;
2857
2858	switch (rdma_node_get_transport(id->device->node_type)) {
2859	case RDMA_TRANSPORT_IB:
2860		ret = cma_modify_qp_err(id_priv);
2861		if (ret)
2862			goto out;
2863		/* Initiate or respond to a disconnect. */
2864		if (ib_send_cm_dreq(id_priv->cm_id.ib, NULL, 0))
2865			ib_send_cm_drep(id_priv->cm_id.ib, NULL, 0);
2866		break;
2867	case RDMA_TRANSPORT_IWARP:
2868		ret = iw_cm_disconnect(id_priv->cm_id.iw, 0);
2869		break;
2870	default:
2871		ret = -EINVAL;
2872		break;
2873	}
2874out:
2875	return ret;
2876}
2877EXPORT_SYMBOL(rdma_disconnect);
2878
2879static int cma_ib_mc_handler(int status, struct ib_sa_multicast *multicast)
2880{
2881	struct rdma_id_private *id_priv;
2882	struct cma_multicast *mc = multicast->context;
2883	struct rdma_cm_event event;
2884	int ret;
2885
2886	id_priv = mc->id_priv;
2887	if (cma_disable_callback(id_priv, RDMA_CM_ADDR_BOUND) &&
2888	    cma_disable_callback(id_priv, RDMA_CM_ADDR_RESOLVED))
2889		return 0;
2890
 
 
2891	mutex_lock(&id_priv->qp_mutex);
2892	if (!status && id_priv->id.qp)
2893		status = ib_attach_mcast(id_priv->id.qp, &multicast->rec.mgid,
2894					 multicast->rec.mlid);
2895	mutex_unlock(&id_priv->qp_mutex);
2896
2897	memset(&event, 0, sizeof event);
2898	event.status = status;
2899	event.param.ud.private_data = mc->context;
2900	if (!status) {
2901		event.event = RDMA_CM_EVENT_MULTICAST_JOIN;
2902		ib_init_ah_from_mcmember(id_priv->id.device,
2903					 id_priv->id.port_num, &multicast->rec,
2904					 &event.param.ud.ah_attr);
2905		event.param.ud.qp_num = 0xFFFFFF;
2906		event.param.ud.qkey = be32_to_cpu(multicast->rec.qkey);
2907	} else
2908		event.event = RDMA_CM_EVENT_MULTICAST_ERROR;
2909
2910	ret = id_priv->id.event_handler(&id_priv->id, &event);
2911	if (ret) {
2912		cma_exch(id_priv, RDMA_CM_DESTROYING);
2913		mutex_unlock(&id_priv->handler_mutex);
2914		rdma_destroy_id(&id_priv->id);
2915		return 0;
2916	}
2917
2918	mutex_unlock(&id_priv->handler_mutex);
2919	return 0;
2920}
2921
2922static void cma_set_mgid(struct rdma_id_private *id_priv,
2923			 struct sockaddr *addr, union ib_gid *mgid)
2924{
2925	unsigned char mc_map[MAX_ADDR_LEN];
2926	struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
2927	struct sockaddr_in *sin = (struct sockaddr_in *) addr;
2928	struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) addr;
2929
2930	if (cma_any_addr(addr)) {
2931		memset(mgid, 0, sizeof *mgid);
2932	} else if ((addr->sa_family == AF_INET6) &&
2933		   ((be32_to_cpu(sin6->sin6_addr.s6_addr32[0]) & 0xFFF0FFFF) ==
2934								 0xFF10A01B)) {
2935		/* IPv6 address is an SA assigned MGID. */
2936		memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
 
 
2937	} else if ((addr->sa_family == AF_INET6)) {
2938		ipv6_ib_mc_map(&sin6->sin6_addr, dev_addr->broadcast, mc_map);
2939		if (id_priv->id.ps == RDMA_PS_UDP)
2940			mc_map[7] = 0x01;	/* Use RDMA CM signature */
2941		*mgid = *(union ib_gid *) (mc_map + 4);
2942	} else {
2943		ip_ib_mc_map(sin->sin_addr.s_addr, dev_addr->broadcast, mc_map);
2944		if (id_priv->id.ps == RDMA_PS_UDP)
2945			mc_map[7] = 0x01;	/* Use RDMA CM signature */
2946		*mgid = *(union ib_gid *) (mc_map + 4);
2947	}
2948}
2949
2950static int cma_join_ib_multicast(struct rdma_id_private *id_priv,
2951				 struct cma_multicast *mc)
2952{
2953	struct ib_sa_mcmember_rec rec;
2954	struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
2955	ib_sa_comp_mask comp_mask;
2956	int ret;
2957
2958	ib_addr_get_mgid(dev_addr, &rec.mgid);
2959	ret = ib_sa_get_mcmember_rec(id_priv->id.device, id_priv->id.port_num,
2960				     &rec.mgid, &rec);
2961	if (ret)
2962		return ret;
2963
 
 
 
 
2964	cma_set_mgid(id_priv, (struct sockaddr *) &mc->addr, &rec.mgid);
2965	if (id_priv->id.ps == RDMA_PS_UDP)
2966		rec.qkey = cpu_to_be32(RDMA_UDP_QKEY);
2967	rdma_addr_get_sgid(dev_addr, &rec.port_gid);
2968	rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
2969	rec.join_state = 1;
2970
2971	comp_mask = IB_SA_MCMEMBER_REC_MGID | IB_SA_MCMEMBER_REC_PORT_GID |
2972		    IB_SA_MCMEMBER_REC_PKEY | IB_SA_MCMEMBER_REC_JOIN_STATE |
2973		    IB_SA_MCMEMBER_REC_QKEY | IB_SA_MCMEMBER_REC_SL |
2974		    IB_SA_MCMEMBER_REC_FLOW_LABEL |
2975		    IB_SA_MCMEMBER_REC_TRAFFIC_CLASS;
2976
2977	if (id_priv->id.ps == RDMA_PS_IPOIB)
2978		comp_mask |= IB_SA_MCMEMBER_REC_RATE |
2979			     IB_SA_MCMEMBER_REC_RATE_SELECTOR;
 
 
 
2980
2981	mc->multicast.ib = ib_sa_join_multicast(&sa_client, id_priv->id.device,
2982						id_priv->id.port_num, &rec,
2983						comp_mask, GFP_KERNEL,
2984						cma_ib_mc_handler, mc);
2985	if (IS_ERR(mc->multicast.ib))
2986		return PTR_ERR(mc->multicast.ib);
2987
2988	return 0;
2989}
2990
2991static void iboe_mcast_work_handler(struct work_struct *work)
2992{
2993	struct iboe_mcast_work *mw = container_of(work, struct iboe_mcast_work, work);
2994	struct cma_multicast *mc = mw->mc;
2995	struct ib_sa_multicast *m = mc->multicast.ib;
2996
2997	mc->multicast.ib->context = mc;
2998	cma_ib_mc_handler(0, m);
2999	kref_put(&mc->mcref, release_mc);
3000	kfree(mw);
3001}
3002
3003static void cma_iboe_set_mgid(struct sockaddr *addr, union ib_gid *mgid)
3004{
3005	struct sockaddr_in *sin = (struct sockaddr_in *)addr;
3006	struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)addr;
3007
3008	if (cma_any_addr(addr)) {
3009		memset(mgid, 0, sizeof *mgid);
3010	} else if (addr->sa_family == AF_INET6) {
3011		memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
3012	} else {
3013		mgid->raw[0] = 0xff;
3014		mgid->raw[1] = 0x0e;
3015		mgid->raw[2] = 0;
3016		mgid->raw[3] = 0;
3017		mgid->raw[4] = 0;
3018		mgid->raw[5] = 0;
3019		mgid->raw[6] = 0;
3020		mgid->raw[7] = 0;
3021		mgid->raw[8] = 0;
3022		mgid->raw[9] = 0;
3023		mgid->raw[10] = 0xff;
3024		mgid->raw[11] = 0xff;
3025		*(__be32 *)(&mgid->raw[12]) = sin->sin_addr.s_addr;
3026	}
3027}
3028
3029static int cma_iboe_join_multicast(struct rdma_id_private *id_priv,
3030				   struct cma_multicast *mc)
3031{
3032	struct iboe_mcast_work *work;
3033	struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
3034	int err;
3035	struct sockaddr *addr = (struct sockaddr *)&mc->addr;
3036	struct net_device *ndev = NULL;
3037
3038	if (cma_zero_addr((struct sockaddr *)&mc->addr))
3039		return -EINVAL;
3040
3041	work = kzalloc(sizeof *work, GFP_KERNEL);
3042	if (!work)
3043		return -ENOMEM;
3044
3045	mc->multicast.ib = kzalloc(sizeof(struct ib_sa_multicast), GFP_KERNEL);
3046	if (!mc->multicast.ib) {
3047		err = -ENOMEM;
3048		goto out1;
3049	}
3050
3051	cma_iboe_set_mgid(addr, &mc->multicast.ib->rec.mgid);
3052
3053	mc->multicast.ib->rec.pkey = cpu_to_be16(0xffff);
3054	if (id_priv->id.ps == RDMA_PS_UDP)
3055		mc->multicast.ib->rec.qkey = cpu_to_be32(RDMA_UDP_QKEY);
3056
3057	if (dev_addr->bound_dev_if)
3058		ndev = dev_get_by_index(&init_net, dev_addr->bound_dev_if);
3059	if (!ndev) {
3060		err = -ENODEV;
3061		goto out2;
3062	}
3063	mc->multicast.ib->rec.rate = iboe_get_rate(ndev);
3064	mc->multicast.ib->rec.hop_limit = 1;
3065	mc->multicast.ib->rec.mtu = iboe_get_mtu(ndev->mtu);
3066	dev_put(ndev);
3067	if (!mc->multicast.ib->rec.mtu) {
3068		err = -EINVAL;
3069		goto out2;
3070	}
3071	iboe_addr_get_sgid(dev_addr, &mc->multicast.ib->rec.port_gid);
 
3072	work->id = id_priv;
3073	work->mc = mc;
3074	INIT_WORK(&work->work, iboe_mcast_work_handler);
3075	kref_get(&mc->mcref);
3076	queue_work(cma_wq, &work->work);
3077
3078	return 0;
3079
3080out2:
3081	kfree(mc->multicast.ib);
3082out1:
3083	kfree(work);
3084	return err;
3085}
3086
3087int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr,
3088			void *context)
3089{
3090	struct rdma_id_private *id_priv;
3091	struct cma_multicast *mc;
3092	int ret;
3093
3094	id_priv = container_of(id, struct rdma_id_private, id);
3095	if (!cma_comp(id_priv, RDMA_CM_ADDR_BOUND) &&
3096	    !cma_comp(id_priv, RDMA_CM_ADDR_RESOLVED))
3097		return -EINVAL;
3098
3099	mc = kmalloc(sizeof *mc, GFP_KERNEL);
3100	if (!mc)
3101		return -ENOMEM;
3102
3103	memcpy(&mc->addr, addr, ip_addr_size(addr));
3104	mc->context = context;
3105	mc->id_priv = id_priv;
3106
3107	spin_lock(&id_priv->lock);
3108	list_add(&mc->list, &id_priv->mc_list);
3109	spin_unlock(&id_priv->lock);
3110
3111	switch (rdma_node_get_transport(id->device->node_type)) {
3112	case RDMA_TRANSPORT_IB:
3113		switch (rdma_port_get_link_layer(id->device, id->port_num)) {
3114		case IB_LINK_LAYER_INFINIBAND:
3115			ret = cma_join_ib_multicast(id_priv, mc);
3116			break;
3117		case IB_LINK_LAYER_ETHERNET:
3118			kref_init(&mc->mcref);
3119			ret = cma_iboe_join_multicast(id_priv, mc);
3120			break;
3121		default:
3122			ret = -EINVAL;
3123		}
3124		break;
3125	default:
3126		ret = -ENOSYS;
3127		break;
3128	}
3129
3130	if (ret) {
3131		spin_lock_irq(&id_priv->lock);
3132		list_del(&mc->list);
3133		spin_unlock_irq(&id_priv->lock);
3134		kfree(mc);
3135	}
3136	return ret;
3137}
3138EXPORT_SYMBOL(rdma_join_multicast);
3139
3140void rdma_leave_multicast(struct rdma_cm_id *id, struct sockaddr *addr)
3141{
3142	struct rdma_id_private *id_priv;
3143	struct cma_multicast *mc;
3144
3145	id_priv = container_of(id, struct rdma_id_private, id);
3146	spin_lock_irq(&id_priv->lock);
3147	list_for_each_entry(mc, &id_priv->mc_list, list) {
3148		if (!memcmp(&mc->addr, addr, ip_addr_size(addr))) {
3149			list_del(&mc->list);
3150			spin_unlock_irq(&id_priv->lock);
3151
3152			if (id->qp)
3153				ib_detach_mcast(id->qp,
3154						&mc->multicast.ib->rec.mgid,
3155						mc->multicast.ib->rec.mlid);
3156			if (rdma_node_get_transport(id_priv->cma_dev->device->node_type) == RDMA_TRANSPORT_IB) {
3157				switch (rdma_port_get_link_layer(id->device, id->port_num)) {
3158				case IB_LINK_LAYER_INFINIBAND:
3159					ib_sa_free_multicast(mc->multicast.ib);
3160					kfree(mc);
3161					break;
3162				case IB_LINK_LAYER_ETHERNET:
3163					kref_put(&mc->mcref, release_mc);
3164					break;
3165				default:
3166					break;
3167				}
3168			}
3169			return;
3170		}
3171	}
3172	spin_unlock_irq(&id_priv->lock);
3173}
3174EXPORT_SYMBOL(rdma_leave_multicast);
3175
3176static int cma_netdev_change(struct net_device *ndev, struct rdma_id_private *id_priv)
3177{
3178	struct rdma_dev_addr *dev_addr;
3179	struct cma_ndev_work *work;
3180
3181	dev_addr = &id_priv->id.route.addr.dev_addr;
3182
3183	if ((dev_addr->bound_dev_if == ndev->ifindex) &&
3184	    memcmp(dev_addr->src_dev_addr, ndev->dev_addr, ndev->addr_len)) {
3185		printk(KERN_INFO "RDMA CM addr change for ndev %s used by id %p\n",
3186		       ndev->name, &id_priv->id);
3187		work = kzalloc(sizeof *work, GFP_KERNEL);
3188		if (!work)
3189			return -ENOMEM;
3190
3191		INIT_WORK(&work->work, cma_ndev_work_handler);
3192		work->id = id_priv;
3193		work->event.event = RDMA_CM_EVENT_ADDR_CHANGE;
3194		atomic_inc(&id_priv->refcount);
3195		queue_work(cma_wq, &work->work);
3196	}
3197
3198	return 0;
3199}
3200
3201static int cma_netdev_callback(struct notifier_block *self, unsigned long event,
3202			       void *ctx)
3203{
3204	struct net_device *ndev = (struct net_device *)ctx;
3205	struct cma_device *cma_dev;
3206	struct rdma_id_private *id_priv;
3207	int ret = NOTIFY_DONE;
3208
3209	if (dev_net(ndev) != &init_net)
3210		return NOTIFY_DONE;
3211
3212	if (event != NETDEV_BONDING_FAILOVER)
3213		return NOTIFY_DONE;
3214
3215	if (!(ndev->flags & IFF_MASTER) || !(ndev->priv_flags & IFF_BONDING))
3216		return NOTIFY_DONE;
3217
3218	mutex_lock(&lock);
3219	list_for_each_entry(cma_dev, &dev_list, list)
3220		list_for_each_entry(id_priv, &cma_dev->id_list, list) {
3221			ret = cma_netdev_change(ndev, id_priv);
3222			if (ret)
3223				goto out;
3224		}
3225
3226out:
3227	mutex_unlock(&lock);
3228	return ret;
3229}
3230
3231static struct notifier_block cma_nb = {
3232	.notifier_call = cma_netdev_callback
3233};
3234
3235static void cma_add_one(struct ib_device *device)
3236{
3237	struct cma_device *cma_dev;
3238	struct rdma_id_private *id_priv;
3239
3240	cma_dev = kmalloc(sizeof *cma_dev, GFP_KERNEL);
3241	if (!cma_dev)
3242		return;
3243
3244	cma_dev->device = device;
3245
3246	init_completion(&cma_dev->comp);
3247	atomic_set(&cma_dev->refcount, 1);
3248	INIT_LIST_HEAD(&cma_dev->id_list);
3249	ib_set_client_data(device, &cma_client, cma_dev);
3250
3251	mutex_lock(&lock);
3252	list_add_tail(&cma_dev->list, &dev_list);
3253	list_for_each_entry(id_priv, &listen_any_list, list)
3254		cma_listen_on_dev(id_priv, cma_dev);
3255	mutex_unlock(&lock);
3256}
3257
3258static int cma_remove_id_dev(struct rdma_id_private *id_priv)
3259{
3260	struct rdma_cm_event event;
3261	enum rdma_cm_state state;
3262	int ret = 0;
3263
3264	/* Record that we want to remove the device */
3265	state = cma_exch(id_priv, RDMA_CM_DEVICE_REMOVAL);
3266	if (state == RDMA_CM_DESTROYING)
3267		return 0;
3268
3269	cma_cancel_operation(id_priv, state);
3270	mutex_lock(&id_priv->handler_mutex);
3271
3272	/* Check for destruction from another callback. */
3273	if (!cma_comp(id_priv, RDMA_CM_DEVICE_REMOVAL))
3274		goto out;
3275
3276	memset(&event, 0, sizeof event);
3277	event.event = RDMA_CM_EVENT_DEVICE_REMOVAL;
3278	ret = id_priv->id.event_handler(&id_priv->id, &event);
3279out:
3280	mutex_unlock(&id_priv->handler_mutex);
3281	return ret;
3282}
3283
3284static void cma_process_remove(struct cma_device *cma_dev)
3285{
3286	struct rdma_id_private *id_priv;
3287	int ret;
3288
3289	mutex_lock(&lock);
3290	while (!list_empty(&cma_dev->id_list)) {
3291		id_priv = list_entry(cma_dev->id_list.next,
3292				     struct rdma_id_private, list);
3293
3294		list_del(&id_priv->listen_list);
3295		list_del_init(&id_priv->list);
3296		atomic_inc(&id_priv->refcount);
3297		mutex_unlock(&lock);
3298
3299		ret = id_priv->internal_id ? 1 : cma_remove_id_dev(id_priv);
3300		cma_deref_id(id_priv);
3301		if (ret)
3302			rdma_destroy_id(&id_priv->id);
3303
3304		mutex_lock(&lock);
3305	}
3306	mutex_unlock(&lock);
3307
3308	cma_deref_dev(cma_dev);
3309	wait_for_completion(&cma_dev->comp);
3310}
3311
3312static void cma_remove_one(struct ib_device *device)
3313{
3314	struct cma_device *cma_dev;
3315
3316	cma_dev = ib_get_client_data(device, &cma_client);
3317	if (!cma_dev)
3318		return;
3319
3320	mutex_lock(&lock);
3321	list_del(&cma_dev->list);
3322	mutex_unlock(&lock);
3323
3324	cma_process_remove(cma_dev);
3325	kfree(cma_dev);
3326}
3327
3328static int cma_get_id_stats(struct sk_buff *skb, struct netlink_callback *cb)
3329{
3330	struct nlmsghdr *nlh;
3331	struct rdma_cm_id_stats *id_stats;
3332	struct rdma_id_private *id_priv;
3333	struct rdma_cm_id *id = NULL;
3334	struct cma_device *cma_dev;
3335	int i_dev = 0, i_id = 0;
3336
3337	/*
3338	 * We export all of the IDs as a sequence of messages.  Each
3339	 * ID gets its own netlink message.
3340	 */
3341	mutex_lock(&lock);
3342
3343	list_for_each_entry(cma_dev, &dev_list, list) {
3344		if (i_dev < cb->args[0]) {
3345			i_dev++;
3346			continue;
3347		}
3348
3349		i_id = 0;
3350		list_for_each_entry(id_priv, &cma_dev->id_list, list) {
3351			if (i_id < cb->args[1]) {
3352				i_id++;
3353				continue;
3354			}
3355
3356			id_stats = ibnl_put_msg(skb, &nlh, cb->nlh->nlmsg_seq,
3357						sizeof *id_stats, RDMA_NL_RDMA_CM,
3358						RDMA_NL_RDMA_CM_ID_STATS);
3359			if (!id_stats)
3360				goto out;
3361
3362			memset(id_stats, 0, sizeof *id_stats);
3363			id = &id_priv->id;
3364			id_stats->node_type = id->route.addr.dev_addr.dev_type;
3365			id_stats->port_num = id->port_num;
3366			id_stats->bound_dev_if =
3367				id->route.addr.dev_addr.bound_dev_if;
3368
3369			if (id->route.addr.src_addr.ss_family == AF_INET) {
3370				if (ibnl_put_attr(skb, nlh,
3371						  sizeof(struct sockaddr_in),
3372						  &id->route.addr.src_addr,
3373						  RDMA_NL_RDMA_CM_ATTR_SRC_ADDR)) {
3374					goto out;
3375				}
3376				if (ibnl_put_attr(skb, nlh,
3377						  sizeof(struct sockaddr_in),
3378						  &id->route.addr.dst_addr,
3379						  RDMA_NL_RDMA_CM_ATTR_DST_ADDR)) {
3380					goto out;
3381				}
3382			} else if (id->route.addr.src_addr.ss_family == AF_INET6) {
3383				if (ibnl_put_attr(skb, nlh,
3384						  sizeof(struct sockaddr_in6),
3385						  &id->route.addr.src_addr,
3386						  RDMA_NL_RDMA_CM_ATTR_SRC_ADDR)) {
3387					goto out;
3388				}
3389				if (ibnl_put_attr(skb, nlh,
3390						  sizeof(struct sockaddr_in6),
3391						  &id->route.addr.dst_addr,
3392						  RDMA_NL_RDMA_CM_ATTR_DST_ADDR)) {
3393					goto out;
3394				}
3395			}
3396
3397			id_stats->pid		= id_priv->owner;
3398			id_stats->port_space	= id->ps;
3399			id_stats->cm_state	= id_priv->state;
3400			id_stats->qp_num	= id_priv->qp_num;
3401			id_stats->qp_type	= id->qp_type;
3402
3403			i_id++;
3404		}
3405
3406		cb->args[1] = 0;
3407		i_dev++;
3408	}
3409
3410out:
3411	mutex_unlock(&lock);
3412	cb->args[0] = i_dev;
3413	cb->args[1] = i_id;
3414
3415	return skb->len;
3416}
3417
3418static const struct ibnl_client_cbs cma_cb_table[] = {
3419	[RDMA_NL_RDMA_CM_ID_STATS] = { .dump = cma_get_id_stats },
 
3420};
3421
3422static int __init cma_init(void)
3423{
3424	int ret;
3425
3426	cma_wq = create_singlethread_workqueue("rdma_cm");
3427	if (!cma_wq)
3428		return -ENOMEM;
3429
3430	ib_sa_register_client(&sa_client);
3431	rdma_addr_register_client(&addr_client);
3432	register_netdevice_notifier(&cma_nb);
3433
3434	ret = ib_register_client(&cma_client);
3435	if (ret)
3436		goto err;
3437
3438	if (ibnl_add_client(RDMA_NL_RDMA_CM, RDMA_NL_RDMA_CM_NUM_OPS, cma_cb_table))
3439		printk(KERN_WARNING "RDMA CMA: failed to add netlink callback\n");
3440
3441	return 0;
3442
3443err:
3444	unregister_netdevice_notifier(&cma_nb);
3445	rdma_addr_unregister_client(&addr_client);
3446	ib_sa_unregister_client(&sa_client);
3447	destroy_workqueue(cma_wq);
3448	return ret;
3449}
3450
3451static void __exit cma_cleanup(void)
3452{
3453	ibnl_remove_client(RDMA_NL_RDMA_CM);
3454	ib_unregister_client(&cma_client);
3455	unregister_netdevice_notifier(&cma_nb);
3456	rdma_addr_unregister_client(&addr_client);
3457	ib_sa_unregister_client(&sa_client);
3458	destroy_workqueue(cma_wq);
3459	idr_destroy(&sdp_ps);
3460	idr_destroy(&tcp_ps);
3461	idr_destroy(&udp_ps);
3462	idr_destroy(&ipoib_ps);
 
3463}
3464
3465module_init(cma_init);
3466module_exit(cma_cleanup);