xref: /openbmc/linux/net/rds/ib.c (revision fce96cf0443083e37455eff8f78fd240c621dae3)
1  /*
2   * Copyright (c) 2006, 2019 Oracle and/or its affiliates. All rights reserved.
3   *
4   * This software is available to you under a choice of one of two
5   * licenses.  You may choose to be licensed under the terms of the GNU
6   * General Public License (GPL) Version 2, available from the file
7   * COPYING in the main directory of this source tree, or the
8   * OpenIB.org BSD license below:
9   *
10   *     Redistribution and use in source and binary forms, with or
11   *     without modification, are permitted provided that the following
12   *     conditions are met:
13   *
14   *      - Redistributions of source code must retain the above
15   *        copyright notice, this list of conditions and the following
16   *        disclaimer.
17   *
18   *      - Redistributions in binary form must reproduce the above
19   *        copyright notice, this list of conditions and the following
20   *        disclaimer in the documentation and/or other materials
21   *        provided with the distribution.
22   *
23   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24   * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25   * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26   * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27   * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28   * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29   * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30   * SOFTWARE.
31   *
32   */
33  #include <linux/kernel.h>
34  #include <linux/in.h>
35  #include <linux/if.h>
36  #include <linux/netdevice.h>
37  #include <linux/inetdevice.h>
38  #include <linux/if_arp.h>
39  #include <linux/delay.h>
40  #include <linux/slab.h>
41  #include <linux/module.h>
42  #include <net/addrconf.h>
43  
44  #include "rds_single_path.h"
45  #include "rds.h"
46  #include "ib.h"
47  #include "ib_mr.h"
48  
49  static unsigned int rds_ib_mr_1m_pool_size = RDS_MR_1M_POOL_SIZE;
50  static unsigned int rds_ib_mr_8k_pool_size = RDS_MR_8K_POOL_SIZE;
51  unsigned int rds_ib_retry_count = RDS_IB_DEFAULT_RETRY_COUNT;
52  static atomic_t rds_ib_unloading;
53  
54  module_param(rds_ib_mr_1m_pool_size, int, 0444);
55  MODULE_PARM_DESC(rds_ib_mr_1m_pool_size, " Max number of 1M mr per HCA");
56  module_param(rds_ib_mr_8k_pool_size, int, 0444);
57  MODULE_PARM_DESC(rds_ib_mr_8k_pool_size, " Max number of 8K mr per HCA");
58  module_param(rds_ib_retry_count, int, 0444);
59  MODULE_PARM_DESC(rds_ib_retry_count, " Number of hw retries before reporting an error");
60  
61  /*
62   * we have a clumsy combination of RCU and a rwsem protecting this list
63   * because it is used both in the get_mr fast path and while blocking in
64   * the FMR flushing path.
65   */
66  DECLARE_RWSEM(rds_ib_devices_lock);
67  struct list_head rds_ib_devices;
68  
69  /* NOTE: if also grabbing ibdev lock, grab this first */
70  DEFINE_SPINLOCK(ib_nodev_conns_lock);
71  LIST_HEAD(ib_nodev_conns);
72  
73  static void rds_ib_nodev_connect(void)
74  {
75  	struct rds_ib_connection *ic;
76  
77  	spin_lock(&ib_nodev_conns_lock);
78  	list_for_each_entry(ic, &ib_nodev_conns, ib_node)
79  		rds_conn_connect_if_down(ic->conn);
80  	spin_unlock(&ib_nodev_conns_lock);
81  }
82  
83  static void rds_ib_dev_shutdown(struct rds_ib_device *rds_ibdev)
84  {
85  	struct rds_ib_connection *ic;
86  	unsigned long flags;
87  
88  	spin_lock_irqsave(&rds_ibdev->spinlock, flags);
89  	list_for_each_entry(ic, &rds_ibdev->conn_list, ib_node)
90  		rds_conn_path_drop(&ic->conn->c_path[0], true);
91  	spin_unlock_irqrestore(&rds_ibdev->spinlock, flags);
92  }
93  
94  /*
95   * rds_ib_destroy_mr_pool() blocks on a few things and mrs drop references
96   * from interrupt context so we push freing off into a work struct in krdsd.
97   */
98  static void rds_ib_dev_free(struct work_struct *work)
99  {
100  	struct rds_ib_ipaddr *i_ipaddr, *i_next;
101  	struct rds_ib_device *rds_ibdev = container_of(work,
102  					struct rds_ib_device, free_work);
103  
104  	if (rds_ibdev->mr_8k_pool)
105  		rds_ib_destroy_mr_pool(rds_ibdev->mr_8k_pool);
106  	if (rds_ibdev->mr_1m_pool)
107  		rds_ib_destroy_mr_pool(rds_ibdev->mr_1m_pool);
108  	if (rds_ibdev->pd)
109  		ib_dealloc_pd(rds_ibdev->pd);
110  
111  	list_for_each_entry_safe(i_ipaddr, i_next, &rds_ibdev->ipaddr_list, list) {
112  		list_del(&i_ipaddr->list);
113  		kfree(i_ipaddr);
114  	}
115  
116  	kfree(rds_ibdev->vector_load);
117  
118  	kfree(rds_ibdev);
119  }
120  
121  void rds_ib_dev_put(struct rds_ib_device *rds_ibdev)
122  {
123  	BUG_ON(refcount_read(&rds_ibdev->refcount) == 0);
124  	if (refcount_dec_and_test(&rds_ibdev->refcount))
125  		queue_work(rds_wq, &rds_ibdev->free_work);
126  }
127  
128  static int rds_ib_add_one(struct ib_device *device)
129  {
130  	struct rds_ib_device *rds_ibdev;
131  	int ret;
132  
133  	/* Only handle IB (no iWARP) devices */
134  	if (device->node_type != RDMA_NODE_IB_CA)
135  		return -EOPNOTSUPP;
136  
137  	/* Device must support FRWR */
138  	if (!(device->attrs.device_cap_flags & IB_DEVICE_MEM_MGT_EXTENSIONS))
139  		return -EOPNOTSUPP;
140  
141  	rds_ibdev = kzalloc_node(sizeof(struct rds_ib_device), GFP_KERNEL,
142  				 ibdev_to_node(device));
143  	if (!rds_ibdev)
144  		return -ENOMEM;
145  
146  	spin_lock_init(&rds_ibdev->spinlock);
147  	refcount_set(&rds_ibdev->refcount, 1);
148  	INIT_WORK(&rds_ibdev->free_work, rds_ib_dev_free);
149  
150  	INIT_LIST_HEAD(&rds_ibdev->ipaddr_list);
151  	INIT_LIST_HEAD(&rds_ibdev->conn_list);
152  
153  	rds_ibdev->max_wrs = device->attrs.max_qp_wr;
154  	rds_ibdev->max_sge = min(device->attrs.max_send_sge, RDS_IB_MAX_SGE);
155  
156  	rds_ibdev->odp_capable =
157  		!!(device->attrs.device_cap_flags &
158  		   IB_DEVICE_ON_DEMAND_PAGING) &&
159  		!!(device->attrs.odp_caps.per_transport_caps.rc_odp_caps &
160  		   IB_ODP_SUPPORT_WRITE) &&
161  		!!(device->attrs.odp_caps.per_transport_caps.rc_odp_caps &
162  		   IB_ODP_SUPPORT_READ);
163  
164  	rds_ibdev->max_1m_mrs = device->attrs.max_mr ?
165  		min_t(unsigned int, (device->attrs.max_mr / 2),
166  		      rds_ib_mr_1m_pool_size) : rds_ib_mr_1m_pool_size;
167  
168  	rds_ibdev->max_8k_mrs = device->attrs.max_mr ?
169  		min_t(unsigned int, ((device->attrs.max_mr / 2) * RDS_MR_8K_SCALE),
170  		      rds_ib_mr_8k_pool_size) : rds_ib_mr_8k_pool_size;
171  
172  	rds_ibdev->max_initiator_depth = device->attrs.max_qp_init_rd_atom;
173  	rds_ibdev->max_responder_resources = device->attrs.max_qp_rd_atom;
174  
175  	rds_ibdev->vector_load = kcalloc(device->num_comp_vectors,
176  					 sizeof(int),
177  					 GFP_KERNEL);
178  	if (!rds_ibdev->vector_load) {
179  		pr_err("RDS/IB: %s failed to allocate vector memory\n",
180  			__func__);
181  		ret = -ENOMEM;
182  		goto put_dev;
183  	}
184  
185  	rds_ibdev->dev = device;
186  	rds_ibdev->pd = ib_alloc_pd(device, 0);
187  	if (IS_ERR(rds_ibdev->pd)) {
188  		ret = PTR_ERR(rds_ibdev->pd);
189  		rds_ibdev->pd = NULL;
190  		goto put_dev;
191  	}
192  
193  	rds_ibdev->mr_1m_pool =
194  		rds_ib_create_mr_pool(rds_ibdev, RDS_IB_MR_1M_POOL);
195  	if (IS_ERR(rds_ibdev->mr_1m_pool)) {
196  		ret = PTR_ERR(rds_ibdev->mr_1m_pool);
197  		rds_ibdev->mr_1m_pool = NULL;
198  		goto put_dev;
199  	}
200  
201  	rds_ibdev->mr_8k_pool =
202  		rds_ib_create_mr_pool(rds_ibdev, RDS_IB_MR_8K_POOL);
203  	if (IS_ERR(rds_ibdev->mr_8k_pool)) {
204  		ret = PTR_ERR(rds_ibdev->mr_8k_pool);
205  		rds_ibdev->mr_8k_pool = NULL;
206  		goto put_dev;
207  	}
208  
209  	rdsdebug("RDS/IB: max_mr = %d, max_wrs = %d, max_sge = %d, max_1m_mrs = %d, max_8k_mrs = %d\n",
210  		 device->attrs.max_mr, rds_ibdev->max_wrs, rds_ibdev->max_sge,
211  		 rds_ibdev->max_1m_mrs, rds_ibdev->max_8k_mrs);
212  
213  	pr_info("RDS/IB: %s: added\n", device->name);
214  
215  	down_write(&rds_ib_devices_lock);
216  	list_add_tail_rcu(&rds_ibdev->list, &rds_ib_devices);
217  	up_write(&rds_ib_devices_lock);
218  	refcount_inc(&rds_ibdev->refcount);
219  
220  	ib_set_client_data(device, &rds_ib_client, rds_ibdev);
221  
222  	rds_ib_nodev_connect();
223  	return 0;
224  
225  put_dev:
226  	rds_ib_dev_put(rds_ibdev);
227  	return ret;
228  }
229  
230  /*
231   * New connections use this to find the device to associate with the
232   * connection.  It's not in the fast path so we're not concerned about the
233   * performance of the IB call.  (As of this writing, it uses an interrupt
234   * blocking spinlock to serialize walking a per-device list of all registered
235   * clients.)
236   *
237   * RCU is used to handle incoming connections racing with device teardown.
238   * Rather than use a lock to serialize removal from the client_data and
239   * getting a new reference, we use an RCU grace period.  The destruction
240   * path removes the device from client_data and then waits for all RCU
241   * readers to finish.
242   *
243   * A new connection can get NULL from this if its arriving on a
244   * device that is in the process of being removed.
245   */
246  struct rds_ib_device *rds_ib_get_client_data(struct ib_device *device)
247  {
248  	struct rds_ib_device *rds_ibdev;
249  
250  	rcu_read_lock();
251  	rds_ibdev = ib_get_client_data(device, &rds_ib_client);
252  	if (rds_ibdev)
253  		refcount_inc(&rds_ibdev->refcount);
254  	rcu_read_unlock();
255  	return rds_ibdev;
256  }
257  
258  /*
259   * The IB stack is letting us know that a device is going away.  This can
260   * happen if the underlying HCA driver is removed or if PCI hotplug is removing
261   * the pci function, for example.
262   *
263   * This can be called at any time and can be racing with any other RDS path.
264   */
265  static void rds_ib_remove_one(struct ib_device *device, void *client_data)
266  {
267  	struct rds_ib_device *rds_ibdev = client_data;
268  
269  	rds_ib_dev_shutdown(rds_ibdev);
270  
271  	/* stop connection attempts from getting a reference to this device. */
272  	ib_set_client_data(device, &rds_ib_client, NULL);
273  
274  	down_write(&rds_ib_devices_lock);
275  	list_del_rcu(&rds_ibdev->list);
276  	up_write(&rds_ib_devices_lock);
277  
278  	/*
279  	 * This synchronize rcu is waiting for readers of both the ib
280  	 * client data and the devices list to finish before we drop
281  	 * both of those references.
282  	 */
283  	synchronize_rcu();
284  	rds_ib_dev_put(rds_ibdev);
285  	rds_ib_dev_put(rds_ibdev);
286  }
287  
288  struct ib_client rds_ib_client = {
289  	.name   = "rds_ib",
290  	.add    = rds_ib_add_one,
291  	.remove = rds_ib_remove_one
292  };
293  
294  static int rds_ib_conn_info_visitor(struct rds_connection *conn,
295  				    void *buffer)
296  {
297  	struct rds_info_rdma_connection *iinfo = buffer;
298  	struct rds_ib_connection *ic = conn->c_transport_data;
299  
300  	/* We will only ever look at IB transports */
301  	if (conn->c_trans != &rds_ib_transport)
302  		return 0;
303  	if (conn->c_isv6)
304  		return 0;
305  
306  	iinfo->src_addr = conn->c_laddr.s6_addr32[3];
307  	iinfo->dst_addr = conn->c_faddr.s6_addr32[3];
308  	if (ic) {
309  		iinfo->tos = conn->c_tos;
310  		iinfo->sl = ic->i_sl;
311  	}
312  
313  	memset(&iinfo->src_gid, 0, sizeof(iinfo->src_gid));
314  	memset(&iinfo->dst_gid, 0, sizeof(iinfo->dst_gid));
315  	if (rds_conn_state(conn) == RDS_CONN_UP) {
316  		struct rds_ib_device *rds_ibdev;
317  
318  		rdma_read_gids(ic->i_cm_id, (union ib_gid *)&iinfo->src_gid,
319  			       (union ib_gid *)&iinfo->dst_gid);
320  
321  		rds_ibdev = ic->rds_ibdev;
322  		iinfo->max_send_wr = ic->i_send_ring.w_nr;
323  		iinfo->max_recv_wr = ic->i_recv_ring.w_nr;
324  		iinfo->max_send_sge = rds_ibdev->max_sge;
325  		rds_ib_get_mr_info(rds_ibdev, iinfo);
326  		iinfo->cache_allocs = atomic_read(&ic->i_cache_allocs);
327  	}
328  	return 1;
329  }
330  
331  #if IS_ENABLED(CONFIG_IPV6)
332  /* IPv6 version of rds_ib_conn_info_visitor(). */
333  static int rds6_ib_conn_info_visitor(struct rds_connection *conn,
334  				     void *buffer)
335  {
336  	struct rds6_info_rdma_connection *iinfo6 = buffer;
337  	struct rds_ib_connection *ic = conn->c_transport_data;
338  
339  	/* We will only ever look at IB transports */
340  	if (conn->c_trans != &rds_ib_transport)
341  		return 0;
342  
343  	iinfo6->src_addr = conn->c_laddr;
344  	iinfo6->dst_addr = conn->c_faddr;
345  	if (ic) {
346  		iinfo6->tos = conn->c_tos;
347  		iinfo6->sl = ic->i_sl;
348  	}
349  
350  	memset(&iinfo6->src_gid, 0, sizeof(iinfo6->src_gid));
351  	memset(&iinfo6->dst_gid, 0, sizeof(iinfo6->dst_gid));
352  
353  	if (rds_conn_state(conn) == RDS_CONN_UP) {
354  		struct rds_ib_device *rds_ibdev;
355  
356  		rdma_read_gids(ic->i_cm_id, (union ib_gid *)&iinfo6->src_gid,
357  			       (union ib_gid *)&iinfo6->dst_gid);
358  		rds_ibdev = ic->rds_ibdev;
359  		iinfo6->max_send_wr = ic->i_send_ring.w_nr;
360  		iinfo6->max_recv_wr = ic->i_recv_ring.w_nr;
361  		iinfo6->max_send_sge = rds_ibdev->max_sge;
362  		rds6_ib_get_mr_info(rds_ibdev, iinfo6);
363  		iinfo6->cache_allocs = atomic_read(&ic->i_cache_allocs);
364  	}
365  	return 1;
366  }
367  #endif
368  
369  static void rds_ib_ic_info(struct socket *sock, unsigned int len,
370  			   struct rds_info_iterator *iter,
371  			   struct rds_info_lengths *lens)
372  {
373  	u64 buffer[(sizeof(struct rds_info_rdma_connection) + 7) / 8];
374  
375  	rds_for_each_conn_info(sock, len, iter, lens,
376  				rds_ib_conn_info_visitor,
377  				buffer,
378  				sizeof(struct rds_info_rdma_connection));
379  }
380  
381  #if IS_ENABLED(CONFIG_IPV6)
382  /* IPv6 version of rds_ib_ic_info(). */
383  static void rds6_ib_ic_info(struct socket *sock, unsigned int len,
384  			    struct rds_info_iterator *iter,
385  			    struct rds_info_lengths *lens)
386  {
387  	u64 buffer[(sizeof(struct rds6_info_rdma_connection) + 7) / 8];
388  
389  	rds_for_each_conn_info(sock, len, iter, lens,
390  			       rds6_ib_conn_info_visitor,
391  			       buffer,
392  			       sizeof(struct rds6_info_rdma_connection));
393  }
394  #endif
395  
396  /*
397   * Early RDS/IB was built to only bind to an address if there is an IPoIB
398   * device with that address set.
399   *
400   * If it were me, I'd advocate for something more flexible.  Sending and
401   * receiving should be device-agnostic.  Transports would try and maintain
402   * connections between peers who have messages queued.  Userspace would be
403   * allowed to influence which paths have priority.  We could call userspace
404   * asserting this policy "routing".
405   */
406  static int rds_ib_laddr_check(struct net *net, const struct in6_addr *addr,
407  			      __u32 scope_id)
408  {
409  	int ret;
410  	struct rdma_cm_id *cm_id;
411  #if IS_ENABLED(CONFIG_IPV6)
412  	struct sockaddr_in6 sin6;
413  #endif
414  	struct sockaddr_in sin;
415  	struct sockaddr *sa;
416  	bool isv4;
417  
418  	isv4 = ipv6_addr_v4mapped(addr);
419  	/* Create a CMA ID and try to bind it. This catches both
420  	 * IB and iWARP capable NICs.
421  	 */
422  	cm_id = rdma_create_id(&init_net, rds_rdma_cm_event_handler,
423  			       NULL, RDMA_PS_TCP, IB_QPT_RC);
424  	if (IS_ERR(cm_id))
425  		return PTR_ERR(cm_id);
426  
427  	if (isv4) {
428  		memset(&sin, 0, sizeof(sin));
429  		sin.sin_family = AF_INET;
430  		sin.sin_addr.s_addr = addr->s6_addr32[3];
431  		sa = (struct sockaddr *)&sin;
432  	} else {
433  #if IS_ENABLED(CONFIG_IPV6)
434  		memset(&sin6, 0, sizeof(sin6));
435  		sin6.sin6_family = AF_INET6;
436  		sin6.sin6_addr = *addr;
437  		sin6.sin6_scope_id = scope_id;
438  		sa = (struct sockaddr *)&sin6;
439  
440  		/* XXX Do a special IPv6 link local address check here.  The
441  		 * reason is that rdma_bind_addr() always succeeds with IPv6
442  		 * link local address regardless it is indeed configured in a
443  		 * system.
444  		 */
445  		if (ipv6_addr_type(addr) & IPV6_ADDR_LINKLOCAL) {
446  			struct net_device *dev;
447  
448  			if (scope_id == 0) {
449  				ret = -EADDRNOTAVAIL;
450  				goto out;
451  			}
452  
453  			/* Use init_net for now as RDS is not network
454  			 * name space aware.
455  			 */
456  			dev = dev_get_by_index(&init_net, scope_id);
457  			if (!dev) {
458  				ret = -EADDRNOTAVAIL;
459  				goto out;
460  			}
461  			if (!ipv6_chk_addr(&init_net, addr, dev, 1)) {
462  				dev_put(dev);
463  				ret = -EADDRNOTAVAIL;
464  				goto out;
465  			}
466  			dev_put(dev);
467  		}
468  #else
469  		ret = -EADDRNOTAVAIL;
470  		goto out;
471  #endif
472  	}
473  
474  	/* rdma_bind_addr will only succeed for IB & iWARP devices */
475  	ret = rdma_bind_addr(cm_id, sa);
476  	/* due to this, we will claim to support iWARP devices unless we
477  	   check node_type. */
478  	if (ret || !cm_id->device ||
479  	    cm_id->device->node_type != RDMA_NODE_IB_CA)
480  		ret = -EADDRNOTAVAIL;
481  
482  	rdsdebug("addr %pI6c%%%u ret %d node type %d\n",
483  		 addr, scope_id, ret,
484  		 cm_id->device ? cm_id->device->node_type : -1);
485  
486  out:
487  	rdma_destroy_id(cm_id);
488  
489  	return ret;
490  }
491  
492  static void rds_ib_unregister_client(void)
493  {
494  	ib_unregister_client(&rds_ib_client);
495  	/* wait for rds_ib_dev_free() to complete */
496  	flush_workqueue(rds_wq);
497  }
498  
499  static void rds_ib_set_unloading(void)
500  {
501  	atomic_set(&rds_ib_unloading, 1);
502  }
503  
504  static bool rds_ib_is_unloading(struct rds_connection *conn)
505  {
506  	struct rds_conn_path *cp = &conn->c_path[0];
507  
508  	return (test_bit(RDS_DESTROY_PENDING, &cp->cp_flags) ||
509  		atomic_read(&rds_ib_unloading) != 0);
510  }
511  
512  void rds_ib_exit(void)
513  {
514  	rds_ib_set_unloading();
515  	synchronize_rcu();
516  	rds_info_deregister_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info);
517  #if IS_ENABLED(CONFIG_IPV6)
518  	rds_info_deregister_func(RDS6_INFO_IB_CONNECTIONS, rds6_ib_ic_info);
519  #endif
520  	rds_ib_unregister_client();
521  	rds_ib_destroy_nodev_conns();
522  	rds_ib_sysctl_exit();
523  	rds_ib_recv_exit();
524  	rds_trans_unregister(&rds_ib_transport);
525  	rds_ib_mr_exit();
526  }
527  
528  static u8 rds_ib_get_tos_map(u8 tos)
529  {
530  	/* 1:1 user to transport map for RDMA transport.
531  	 * In future, if custom map is desired, hook can export
532  	 * user configurable map.
533  	 */
534  	return tos;
535  }
536  
537  struct rds_transport rds_ib_transport = {
538  	.laddr_check		= rds_ib_laddr_check,
539  	.xmit_path_complete	= rds_ib_xmit_path_complete,
540  	.xmit			= rds_ib_xmit,
541  	.xmit_rdma		= rds_ib_xmit_rdma,
542  	.xmit_atomic		= rds_ib_xmit_atomic,
543  	.recv_path		= rds_ib_recv_path,
544  	.conn_alloc		= rds_ib_conn_alloc,
545  	.conn_free		= rds_ib_conn_free,
546  	.conn_path_connect	= rds_ib_conn_path_connect,
547  	.conn_path_shutdown	= rds_ib_conn_path_shutdown,
548  	.inc_copy_to_user	= rds_ib_inc_copy_to_user,
549  	.inc_free		= rds_ib_inc_free,
550  	.cm_initiate_connect	= rds_ib_cm_initiate_connect,
551  	.cm_handle_connect	= rds_ib_cm_handle_connect,
552  	.cm_connect_complete	= rds_ib_cm_connect_complete,
553  	.stats_info_copy	= rds_ib_stats_info_copy,
554  	.exit			= rds_ib_exit,
555  	.get_mr			= rds_ib_get_mr,
556  	.sync_mr		= rds_ib_sync_mr,
557  	.free_mr		= rds_ib_free_mr,
558  	.flush_mrs		= rds_ib_flush_mrs,
559  	.get_tos_map		= rds_ib_get_tos_map,
560  	.t_owner		= THIS_MODULE,
561  	.t_name			= "infiniband",
562  	.t_unloading		= rds_ib_is_unloading,
563  	.t_type			= RDS_TRANS_IB
564  };
565  
566  int rds_ib_init(void)
567  {
568  	int ret;
569  
570  	INIT_LIST_HEAD(&rds_ib_devices);
571  
572  	ret = rds_ib_mr_init();
573  	if (ret)
574  		goto out;
575  
576  	ret = ib_register_client(&rds_ib_client);
577  	if (ret)
578  		goto out_mr_exit;
579  
580  	ret = rds_ib_sysctl_init();
581  	if (ret)
582  		goto out_ibreg;
583  
584  	ret = rds_ib_recv_init();
585  	if (ret)
586  		goto out_sysctl;
587  
588  	rds_trans_register(&rds_ib_transport);
589  
590  	rds_info_register_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info);
591  #if IS_ENABLED(CONFIG_IPV6)
592  	rds_info_register_func(RDS6_INFO_IB_CONNECTIONS, rds6_ib_ic_info);
593  #endif
594  
595  	goto out;
596  
597  out_sysctl:
598  	rds_ib_sysctl_exit();
599  out_ibreg:
600  	rds_ib_unregister_client();
601  out_mr_exit:
602  	rds_ib_mr_exit();
603  out:
604  	return ret;
605  }
606  
607  MODULE_LICENSE("GPL");
608