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1/*
2 * Copyright (c) 2006 Oracle. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 *
32 */
33#include <linux/kernel.h>
34#include <linux/in.h>
35#include <linux/if.h>
36#include <linux/netdevice.h>
37#include <linux/inetdevice.h>
38#include <linux/if_arp.h>
39#include <linux/delay.h>
40#include <linux/slab.h>
41#include <linux/module.h>
42
43#include "rds_single_path.h"
44#include "rds.h"
45#include "ib.h"
46#include "ib_mr.h"
47
48unsigned int rds_ib_mr_1m_pool_size = RDS_MR_1M_POOL_SIZE;
49unsigned int rds_ib_mr_8k_pool_size = RDS_MR_8K_POOL_SIZE;
50unsigned int rds_ib_retry_count = RDS_IB_DEFAULT_RETRY_COUNT;
51
52module_param(rds_ib_mr_1m_pool_size, int, 0444);
53MODULE_PARM_DESC(rds_ib_mr_1m_pool_size, " Max number of 1M mr per HCA");
54module_param(rds_ib_mr_8k_pool_size, int, 0444);
55MODULE_PARM_DESC(rds_ib_mr_8k_pool_size, " Max number of 8K mr per HCA");
56module_param(rds_ib_retry_count, int, 0444);
57MODULE_PARM_DESC(rds_ib_retry_count, " Number of hw retries before reporting an error");
58
59/*
60 * we have a clumsy combination of RCU and a rwsem protecting this list
61 * because it is used both in the get_mr fast path and while blocking in
62 * the FMR flushing path.
63 */
64DECLARE_RWSEM(rds_ib_devices_lock);
65struct list_head rds_ib_devices;
66
67/* NOTE: if also grabbing ibdev lock, grab this first */
68DEFINE_SPINLOCK(ib_nodev_conns_lock);
69LIST_HEAD(ib_nodev_conns);
70
71static void rds_ib_nodev_connect(void)
72{
73 struct rds_ib_connection *ic;
74
75 spin_lock(&ib_nodev_conns_lock);
76 list_for_each_entry(ic, &ib_nodev_conns, ib_node)
77 rds_conn_connect_if_down(ic->conn);
78 spin_unlock(&ib_nodev_conns_lock);
79}
80
81static void rds_ib_dev_shutdown(struct rds_ib_device *rds_ibdev)
82{
83 struct rds_ib_connection *ic;
84 unsigned long flags;
85
86 spin_lock_irqsave(&rds_ibdev->spinlock, flags);
87 list_for_each_entry(ic, &rds_ibdev->conn_list, ib_node)
88 rds_conn_drop(ic->conn);
89 spin_unlock_irqrestore(&rds_ibdev->spinlock, flags);
90}
91
92/*
93 * rds_ib_destroy_mr_pool() blocks on a few things and mrs drop references
94 * from interrupt context so we push freing off into a work struct in krdsd.
95 */
96static void rds_ib_dev_free(struct work_struct *work)
97{
98 struct rds_ib_ipaddr *i_ipaddr, *i_next;
99 struct rds_ib_device *rds_ibdev = container_of(work,
100 struct rds_ib_device, free_work);
101
102 if (rds_ibdev->mr_8k_pool)
103 rds_ib_destroy_mr_pool(rds_ibdev->mr_8k_pool);
104 if (rds_ibdev->mr_1m_pool)
105 rds_ib_destroy_mr_pool(rds_ibdev->mr_1m_pool);
106 if (rds_ibdev->pd)
107 ib_dealloc_pd(rds_ibdev->pd);
108
109 list_for_each_entry_safe(i_ipaddr, i_next, &rds_ibdev->ipaddr_list, list) {
110 list_del(&i_ipaddr->list);
111 kfree(i_ipaddr);
112 }
113
114 kfree(rds_ibdev);
115}
116
117void rds_ib_dev_put(struct rds_ib_device *rds_ibdev)
118{
119 BUG_ON(atomic_read(&rds_ibdev->refcount) <= 0);
120 if (atomic_dec_and_test(&rds_ibdev->refcount))
121 queue_work(rds_wq, &rds_ibdev->free_work);
122}
123
124static void rds_ib_add_one(struct ib_device *device)
125{
126 struct rds_ib_device *rds_ibdev;
127
128 /* Only handle IB (no iWARP) devices */
129 if (device->node_type != RDMA_NODE_IB_CA)
130 return;
131
132 rds_ibdev = kzalloc_node(sizeof(struct rds_ib_device), GFP_KERNEL,
133 ibdev_to_node(device));
134 if (!rds_ibdev)
135 return;
136
137 spin_lock_init(&rds_ibdev->spinlock);
138 atomic_set(&rds_ibdev->refcount, 1);
139 INIT_WORK(&rds_ibdev->free_work, rds_ib_dev_free);
140
141 rds_ibdev->max_wrs = device->attrs.max_qp_wr;
142 rds_ibdev->max_sge = min(device->attrs.max_sge, RDS_IB_MAX_SGE);
143
144 rds_ibdev->has_fr = (device->attrs.device_cap_flags &
145 IB_DEVICE_MEM_MGT_EXTENSIONS);
146 rds_ibdev->has_fmr = (device->alloc_fmr && device->dealloc_fmr &&
147 device->map_phys_fmr && device->unmap_fmr);
148 rds_ibdev->use_fastreg = (rds_ibdev->has_fr && !rds_ibdev->has_fmr);
149
150 rds_ibdev->fmr_max_remaps = device->attrs.max_map_per_fmr?: 32;
151 rds_ibdev->max_1m_mrs = device->attrs.max_mr ?
152 min_t(unsigned int, (device->attrs.max_mr / 2),
153 rds_ib_mr_1m_pool_size) : rds_ib_mr_1m_pool_size;
154
155 rds_ibdev->max_8k_mrs = device->attrs.max_mr ?
156 min_t(unsigned int, ((device->attrs.max_mr / 2) * RDS_MR_8K_SCALE),
157 rds_ib_mr_8k_pool_size) : rds_ib_mr_8k_pool_size;
158
159 rds_ibdev->max_initiator_depth = device->attrs.max_qp_init_rd_atom;
160 rds_ibdev->max_responder_resources = device->attrs.max_qp_rd_atom;
161
162 rds_ibdev->dev = device;
163 rds_ibdev->pd = ib_alloc_pd(device, 0);
164 if (IS_ERR(rds_ibdev->pd)) {
165 rds_ibdev->pd = NULL;
166 goto put_dev;
167 }
168
169 rds_ibdev->mr_1m_pool =
170 rds_ib_create_mr_pool(rds_ibdev, RDS_IB_MR_1M_POOL);
171 if (IS_ERR(rds_ibdev->mr_1m_pool)) {
172 rds_ibdev->mr_1m_pool = NULL;
173 goto put_dev;
174 }
175
176 rds_ibdev->mr_8k_pool =
177 rds_ib_create_mr_pool(rds_ibdev, RDS_IB_MR_8K_POOL);
178 if (IS_ERR(rds_ibdev->mr_8k_pool)) {
179 rds_ibdev->mr_8k_pool = NULL;
180 goto put_dev;
181 }
182
183 rdsdebug("RDS/IB: max_mr = %d, max_wrs = %d, max_sge = %d, fmr_max_remaps = %d, max_1m_mrs = %d, max_8k_mrs = %d\n",
184 device->attrs.max_fmr, rds_ibdev->max_wrs, rds_ibdev->max_sge,
185 rds_ibdev->fmr_max_remaps, rds_ibdev->max_1m_mrs,
186 rds_ibdev->max_8k_mrs);
187
188 pr_info("RDS/IB: %s: %s supported and preferred\n",
189 device->name,
190 rds_ibdev->use_fastreg ? "FRMR" : "FMR");
191
192 INIT_LIST_HEAD(&rds_ibdev->ipaddr_list);
193 INIT_LIST_HEAD(&rds_ibdev->conn_list);
194
195 down_write(&rds_ib_devices_lock);
196 list_add_tail_rcu(&rds_ibdev->list, &rds_ib_devices);
197 up_write(&rds_ib_devices_lock);
198 atomic_inc(&rds_ibdev->refcount);
199
200 ib_set_client_data(device, &rds_ib_client, rds_ibdev);
201 atomic_inc(&rds_ibdev->refcount);
202
203 rds_ib_nodev_connect();
204
205put_dev:
206 rds_ib_dev_put(rds_ibdev);
207}
208
209/*
210 * New connections use this to find the device to associate with the
211 * connection. It's not in the fast path so we're not concerned about the
212 * performance of the IB call. (As of this writing, it uses an interrupt
213 * blocking spinlock to serialize walking a per-device list of all registered
214 * clients.)
215 *
216 * RCU is used to handle incoming connections racing with device teardown.
217 * Rather than use a lock to serialize removal from the client_data and
218 * getting a new reference, we use an RCU grace period. The destruction
219 * path removes the device from client_data and then waits for all RCU
220 * readers to finish.
221 *
222 * A new connection can get NULL from this if its arriving on a
223 * device that is in the process of being removed.
224 */
225struct rds_ib_device *rds_ib_get_client_data(struct ib_device *device)
226{
227 struct rds_ib_device *rds_ibdev;
228
229 rcu_read_lock();
230 rds_ibdev = ib_get_client_data(device, &rds_ib_client);
231 if (rds_ibdev)
232 atomic_inc(&rds_ibdev->refcount);
233 rcu_read_unlock();
234 return rds_ibdev;
235}
236
237/*
238 * The IB stack is letting us know that a device is going away. This can
239 * happen if the underlying HCA driver is removed or if PCI hotplug is removing
240 * the pci function, for example.
241 *
242 * This can be called at any time and can be racing with any other RDS path.
243 */
244static void rds_ib_remove_one(struct ib_device *device, void *client_data)
245{
246 struct rds_ib_device *rds_ibdev = client_data;
247
248 if (!rds_ibdev)
249 return;
250
251 rds_ib_dev_shutdown(rds_ibdev);
252
253 /* stop connection attempts from getting a reference to this device. */
254 ib_set_client_data(device, &rds_ib_client, NULL);
255
256 down_write(&rds_ib_devices_lock);
257 list_del_rcu(&rds_ibdev->list);
258 up_write(&rds_ib_devices_lock);
259
260 /*
261 * This synchronize rcu is waiting for readers of both the ib
262 * client data and the devices list to finish before we drop
263 * both of those references.
264 */
265 synchronize_rcu();
266 rds_ib_dev_put(rds_ibdev);
267 rds_ib_dev_put(rds_ibdev);
268}
269
270struct ib_client rds_ib_client = {
271 .name = "rds_ib",
272 .add = rds_ib_add_one,
273 .remove = rds_ib_remove_one
274};
275
276static int rds_ib_conn_info_visitor(struct rds_connection *conn,
277 void *buffer)
278{
279 struct rds_info_rdma_connection *iinfo = buffer;
280 struct rds_ib_connection *ic;
281
282 /* We will only ever look at IB transports */
283 if (conn->c_trans != &rds_ib_transport)
284 return 0;
285
286 iinfo->src_addr = conn->c_laddr;
287 iinfo->dst_addr = conn->c_faddr;
288
289 memset(&iinfo->src_gid, 0, sizeof(iinfo->src_gid));
290 memset(&iinfo->dst_gid, 0, sizeof(iinfo->dst_gid));
291 if (rds_conn_state(conn) == RDS_CONN_UP) {
292 struct rds_ib_device *rds_ibdev;
293 struct rdma_dev_addr *dev_addr;
294
295 ic = conn->c_transport_data;
296 dev_addr = &ic->i_cm_id->route.addr.dev_addr;
297
298 rdma_addr_get_sgid(dev_addr, (union ib_gid *) &iinfo->src_gid);
299 rdma_addr_get_dgid(dev_addr, (union ib_gid *) &iinfo->dst_gid);
300
301 rds_ibdev = ic->rds_ibdev;
302 iinfo->max_send_wr = ic->i_send_ring.w_nr;
303 iinfo->max_recv_wr = ic->i_recv_ring.w_nr;
304 iinfo->max_send_sge = rds_ibdev->max_sge;
305 rds_ib_get_mr_info(rds_ibdev, iinfo);
306 }
307 return 1;
308}
309
310static void rds_ib_ic_info(struct socket *sock, unsigned int len,
311 struct rds_info_iterator *iter,
312 struct rds_info_lengths *lens)
313{
314 rds_for_each_conn_info(sock, len, iter, lens,
315 rds_ib_conn_info_visitor,
316 sizeof(struct rds_info_rdma_connection));
317}
318
319
320/*
321 * Early RDS/IB was built to only bind to an address if there is an IPoIB
322 * device with that address set.
323 *
324 * If it were me, I'd advocate for something more flexible. Sending and
325 * receiving should be device-agnostic. Transports would try and maintain
326 * connections between peers who have messages queued. Userspace would be
327 * allowed to influence which paths have priority. We could call userspace
328 * asserting this policy "routing".
329 */
330static int rds_ib_laddr_check(struct net *net, __be32 addr)
331{
332 int ret;
333 struct rdma_cm_id *cm_id;
334 struct sockaddr_in sin;
335
336 /* Create a CMA ID and try to bind it. This catches both
337 * IB and iWARP capable NICs.
338 */
339 cm_id = rdma_create_id(&init_net, NULL, NULL, RDMA_PS_TCP, IB_QPT_RC);
340 if (IS_ERR(cm_id))
341 return PTR_ERR(cm_id);
342
343 memset(&sin, 0, sizeof(sin));
344 sin.sin_family = AF_INET;
345 sin.sin_addr.s_addr = addr;
346
347 /* rdma_bind_addr will only succeed for IB & iWARP devices */
348 ret = rdma_bind_addr(cm_id, (struct sockaddr *)&sin);
349 /* due to this, we will claim to support iWARP devices unless we
350 check node_type. */
351 if (ret || !cm_id->device ||
352 cm_id->device->node_type != RDMA_NODE_IB_CA)
353 ret = -EADDRNOTAVAIL;
354
355 rdsdebug("addr %pI4 ret %d node type %d\n",
356 &addr, ret,
357 cm_id->device ? cm_id->device->node_type : -1);
358
359 rdma_destroy_id(cm_id);
360
361 return ret;
362}
363
364static void rds_ib_unregister_client(void)
365{
366 ib_unregister_client(&rds_ib_client);
367 /* wait for rds_ib_dev_free() to complete */
368 flush_workqueue(rds_wq);
369}
370
371void rds_ib_exit(void)
372{
373 rds_info_deregister_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info);
374 rds_ib_unregister_client();
375 rds_ib_destroy_nodev_conns();
376 rds_ib_sysctl_exit();
377 rds_ib_recv_exit();
378 rds_trans_unregister(&rds_ib_transport);
379 rds_ib_mr_exit();
380}
381
382struct rds_transport rds_ib_transport = {
383 .laddr_check = rds_ib_laddr_check,
384 .xmit_path_complete = rds_ib_xmit_path_complete,
385 .xmit = rds_ib_xmit,
386 .xmit_rdma = rds_ib_xmit_rdma,
387 .xmit_atomic = rds_ib_xmit_atomic,
388 .recv_path = rds_ib_recv_path,
389 .conn_alloc = rds_ib_conn_alloc,
390 .conn_free = rds_ib_conn_free,
391 .conn_path_connect = rds_ib_conn_path_connect,
392 .conn_path_shutdown = rds_ib_conn_path_shutdown,
393 .inc_copy_to_user = rds_ib_inc_copy_to_user,
394 .inc_free = rds_ib_inc_free,
395 .cm_initiate_connect = rds_ib_cm_initiate_connect,
396 .cm_handle_connect = rds_ib_cm_handle_connect,
397 .cm_connect_complete = rds_ib_cm_connect_complete,
398 .stats_info_copy = rds_ib_stats_info_copy,
399 .exit = rds_ib_exit,
400 .get_mr = rds_ib_get_mr,
401 .sync_mr = rds_ib_sync_mr,
402 .free_mr = rds_ib_free_mr,
403 .flush_mrs = rds_ib_flush_mrs,
404 .t_owner = THIS_MODULE,
405 .t_name = "infiniband",
406 .t_type = RDS_TRANS_IB
407};
408
409int rds_ib_init(void)
410{
411 int ret;
412
413 INIT_LIST_HEAD(&rds_ib_devices);
414
415 ret = rds_ib_mr_init();
416 if (ret)
417 goto out;
418
419 ret = ib_register_client(&rds_ib_client);
420 if (ret)
421 goto out_mr_exit;
422
423 ret = rds_ib_sysctl_init();
424 if (ret)
425 goto out_ibreg;
426
427 ret = rds_ib_recv_init();
428 if (ret)
429 goto out_sysctl;
430
431 ret = rds_trans_register(&rds_ib_transport);
432 if (ret)
433 goto out_recv;
434
435 rds_info_register_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info);
436
437 goto out;
438
439out_recv:
440 rds_ib_recv_exit();
441out_sysctl:
442 rds_ib_sysctl_exit();
443out_ibreg:
444 rds_ib_unregister_client();
445out_mr_exit:
446 rds_ib_mr_exit();
447out:
448 return ret;
449}
450
451MODULE_LICENSE("GPL");
452
1/*
2 * Copyright (c) 2006 Oracle. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 *
32 */
33#include <linux/kernel.h>
34#include <linux/in.h>
35#include <linux/if.h>
36#include <linux/netdevice.h>
37#include <linux/inetdevice.h>
38#include <linux/if_arp.h>
39#include <linux/delay.h>
40#include <linux/slab.h>
41
42#include "rds.h"
43#include "ib.h"
44
45static unsigned int fmr_pool_size = RDS_FMR_POOL_SIZE;
46unsigned int fmr_message_size = RDS_FMR_SIZE + 1; /* +1 allows for unaligned MRs */
47unsigned int rds_ib_retry_count = RDS_IB_DEFAULT_RETRY_COUNT;
48
49module_param(fmr_pool_size, int, 0444);
50MODULE_PARM_DESC(fmr_pool_size, " Max number of fmr per HCA");
51module_param(fmr_message_size, int, 0444);
52MODULE_PARM_DESC(fmr_message_size, " Max size of a RDMA transfer");
53module_param(rds_ib_retry_count, int, 0444);
54MODULE_PARM_DESC(rds_ib_retry_count, " Number of hw retries before reporting an error");
55
56/*
57 * we have a clumsy combination of RCU and a rwsem protecting this list
58 * because it is used both in the get_mr fast path and while blocking in
59 * the FMR flushing path.
60 */
61DECLARE_RWSEM(rds_ib_devices_lock);
62struct list_head rds_ib_devices;
63
64/* NOTE: if also grabbing ibdev lock, grab this first */
65DEFINE_SPINLOCK(ib_nodev_conns_lock);
66LIST_HEAD(ib_nodev_conns);
67
68static void rds_ib_nodev_connect(void)
69{
70 struct rds_ib_connection *ic;
71
72 spin_lock(&ib_nodev_conns_lock);
73 list_for_each_entry(ic, &ib_nodev_conns, ib_node)
74 rds_conn_connect_if_down(ic->conn);
75 spin_unlock(&ib_nodev_conns_lock);
76}
77
78static void rds_ib_dev_shutdown(struct rds_ib_device *rds_ibdev)
79{
80 struct rds_ib_connection *ic;
81 unsigned long flags;
82
83 spin_lock_irqsave(&rds_ibdev->spinlock, flags);
84 list_for_each_entry(ic, &rds_ibdev->conn_list, ib_node)
85 rds_conn_drop(ic->conn);
86 spin_unlock_irqrestore(&rds_ibdev->spinlock, flags);
87}
88
89/*
90 * rds_ib_destroy_mr_pool() blocks on a few things and mrs drop references
91 * from interrupt context so we push freing off into a work struct in krdsd.
92 */
93static void rds_ib_dev_free(struct work_struct *work)
94{
95 struct rds_ib_ipaddr *i_ipaddr, *i_next;
96 struct rds_ib_device *rds_ibdev = container_of(work,
97 struct rds_ib_device, free_work);
98
99 if (rds_ibdev->mr_pool)
100 rds_ib_destroy_mr_pool(rds_ibdev->mr_pool);
101 if (rds_ibdev->mr)
102 ib_dereg_mr(rds_ibdev->mr);
103 if (rds_ibdev->pd)
104 ib_dealloc_pd(rds_ibdev->pd);
105
106 list_for_each_entry_safe(i_ipaddr, i_next, &rds_ibdev->ipaddr_list, list) {
107 list_del(&i_ipaddr->list);
108 kfree(i_ipaddr);
109 }
110
111 kfree(rds_ibdev);
112}
113
114void rds_ib_dev_put(struct rds_ib_device *rds_ibdev)
115{
116 BUG_ON(atomic_read(&rds_ibdev->refcount) <= 0);
117 if (atomic_dec_and_test(&rds_ibdev->refcount))
118 queue_work(rds_wq, &rds_ibdev->free_work);
119}
120
121static void rds_ib_add_one(struct ib_device *device)
122{
123 struct rds_ib_device *rds_ibdev;
124 struct ib_device_attr *dev_attr;
125
126 /* Only handle IB (no iWARP) devices */
127 if (device->node_type != RDMA_NODE_IB_CA)
128 return;
129
130 dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
131 if (!dev_attr)
132 return;
133
134 if (ib_query_device(device, dev_attr)) {
135 rdsdebug("Query device failed for %s\n", device->name);
136 goto free_attr;
137 }
138
139 rds_ibdev = kzalloc_node(sizeof(struct rds_ib_device), GFP_KERNEL,
140 ibdev_to_node(device));
141 if (!rds_ibdev)
142 goto free_attr;
143
144 spin_lock_init(&rds_ibdev->spinlock);
145 atomic_set(&rds_ibdev->refcount, 1);
146 INIT_WORK(&rds_ibdev->free_work, rds_ib_dev_free);
147
148 rds_ibdev->max_wrs = dev_attr->max_qp_wr;
149 rds_ibdev->max_sge = min(dev_attr->max_sge, RDS_IB_MAX_SGE);
150
151 rds_ibdev->fmr_max_remaps = dev_attr->max_map_per_fmr?: 32;
152 rds_ibdev->max_fmrs = dev_attr->max_fmr ?
153 min_t(unsigned int, dev_attr->max_fmr, fmr_pool_size) :
154 fmr_pool_size;
155
156 rds_ibdev->max_initiator_depth = dev_attr->max_qp_init_rd_atom;
157 rds_ibdev->max_responder_resources = dev_attr->max_qp_rd_atom;
158
159 rds_ibdev->dev = device;
160 rds_ibdev->pd = ib_alloc_pd(device);
161 if (IS_ERR(rds_ibdev->pd)) {
162 rds_ibdev->pd = NULL;
163 goto put_dev;
164 }
165
166 rds_ibdev->mr = ib_get_dma_mr(rds_ibdev->pd, IB_ACCESS_LOCAL_WRITE);
167 if (IS_ERR(rds_ibdev->mr)) {
168 rds_ibdev->mr = NULL;
169 goto put_dev;
170 }
171
172 rds_ibdev->mr_pool = rds_ib_create_mr_pool(rds_ibdev);
173 if (IS_ERR(rds_ibdev->mr_pool)) {
174 rds_ibdev->mr_pool = NULL;
175 goto put_dev;
176 }
177
178 INIT_LIST_HEAD(&rds_ibdev->ipaddr_list);
179 INIT_LIST_HEAD(&rds_ibdev->conn_list);
180
181 down_write(&rds_ib_devices_lock);
182 list_add_tail_rcu(&rds_ibdev->list, &rds_ib_devices);
183 up_write(&rds_ib_devices_lock);
184 atomic_inc(&rds_ibdev->refcount);
185
186 ib_set_client_data(device, &rds_ib_client, rds_ibdev);
187 atomic_inc(&rds_ibdev->refcount);
188
189 rds_ib_nodev_connect();
190
191put_dev:
192 rds_ib_dev_put(rds_ibdev);
193free_attr:
194 kfree(dev_attr);
195}
196
197/*
198 * New connections use this to find the device to associate with the
199 * connection. It's not in the fast path so we're not concerned about the
200 * performance of the IB call. (As of this writing, it uses an interrupt
201 * blocking spinlock to serialize walking a per-device list of all registered
202 * clients.)
203 *
204 * RCU is used to handle incoming connections racing with device teardown.
205 * Rather than use a lock to serialize removal from the client_data and
206 * getting a new reference, we use an RCU grace period. The destruction
207 * path removes the device from client_data and then waits for all RCU
208 * readers to finish.
209 *
210 * A new connection can get NULL from this if its arriving on a
211 * device that is in the process of being removed.
212 */
213struct rds_ib_device *rds_ib_get_client_data(struct ib_device *device)
214{
215 struct rds_ib_device *rds_ibdev;
216
217 rcu_read_lock();
218 rds_ibdev = ib_get_client_data(device, &rds_ib_client);
219 if (rds_ibdev)
220 atomic_inc(&rds_ibdev->refcount);
221 rcu_read_unlock();
222 return rds_ibdev;
223}
224
225/*
226 * The IB stack is letting us know that a device is going away. This can
227 * happen if the underlying HCA driver is removed or if PCI hotplug is removing
228 * the pci function, for example.
229 *
230 * This can be called at any time and can be racing with any other RDS path.
231 */
232static void rds_ib_remove_one(struct ib_device *device)
233{
234 struct rds_ib_device *rds_ibdev;
235
236 rds_ibdev = ib_get_client_data(device, &rds_ib_client);
237 if (!rds_ibdev)
238 return;
239
240 rds_ib_dev_shutdown(rds_ibdev);
241
242 /* stop connection attempts from getting a reference to this device. */
243 ib_set_client_data(device, &rds_ib_client, NULL);
244
245 down_write(&rds_ib_devices_lock);
246 list_del_rcu(&rds_ibdev->list);
247 up_write(&rds_ib_devices_lock);
248
249 /*
250 * This synchronize rcu is waiting for readers of both the ib
251 * client data and the devices list to finish before we drop
252 * both of those references.
253 */
254 synchronize_rcu();
255 rds_ib_dev_put(rds_ibdev);
256 rds_ib_dev_put(rds_ibdev);
257}
258
259struct ib_client rds_ib_client = {
260 .name = "rds_ib",
261 .add = rds_ib_add_one,
262 .remove = rds_ib_remove_one
263};
264
265static int rds_ib_conn_info_visitor(struct rds_connection *conn,
266 void *buffer)
267{
268 struct rds_info_rdma_connection *iinfo = buffer;
269 struct rds_ib_connection *ic;
270
271 /* We will only ever look at IB transports */
272 if (conn->c_trans != &rds_ib_transport)
273 return 0;
274
275 iinfo->src_addr = conn->c_laddr;
276 iinfo->dst_addr = conn->c_faddr;
277
278 memset(&iinfo->src_gid, 0, sizeof(iinfo->src_gid));
279 memset(&iinfo->dst_gid, 0, sizeof(iinfo->dst_gid));
280 if (rds_conn_state(conn) == RDS_CONN_UP) {
281 struct rds_ib_device *rds_ibdev;
282 struct rdma_dev_addr *dev_addr;
283
284 ic = conn->c_transport_data;
285 dev_addr = &ic->i_cm_id->route.addr.dev_addr;
286
287 rdma_addr_get_sgid(dev_addr, (union ib_gid *) &iinfo->src_gid);
288 rdma_addr_get_dgid(dev_addr, (union ib_gid *) &iinfo->dst_gid);
289
290 rds_ibdev = ic->rds_ibdev;
291 iinfo->max_send_wr = ic->i_send_ring.w_nr;
292 iinfo->max_recv_wr = ic->i_recv_ring.w_nr;
293 iinfo->max_send_sge = rds_ibdev->max_sge;
294 rds_ib_get_mr_info(rds_ibdev, iinfo);
295 }
296 return 1;
297}
298
299static void rds_ib_ic_info(struct socket *sock, unsigned int len,
300 struct rds_info_iterator *iter,
301 struct rds_info_lengths *lens)
302{
303 rds_for_each_conn_info(sock, len, iter, lens,
304 rds_ib_conn_info_visitor,
305 sizeof(struct rds_info_rdma_connection));
306}
307
308
309/*
310 * Early RDS/IB was built to only bind to an address if there is an IPoIB
311 * device with that address set.
312 *
313 * If it were me, I'd advocate for something more flexible. Sending and
314 * receiving should be device-agnostic. Transports would try and maintain
315 * connections between peers who have messages queued. Userspace would be
316 * allowed to influence which paths have priority. We could call userspace
317 * asserting this policy "routing".
318 */
319static int rds_ib_laddr_check(__be32 addr)
320{
321 int ret;
322 struct rdma_cm_id *cm_id;
323 struct sockaddr_in sin;
324
325 /* Create a CMA ID and try to bind it. This catches both
326 * IB and iWARP capable NICs.
327 */
328 cm_id = rdma_create_id(NULL, NULL, RDMA_PS_TCP, IB_QPT_RC);
329 if (IS_ERR(cm_id))
330 return PTR_ERR(cm_id);
331
332 memset(&sin, 0, sizeof(sin));
333 sin.sin_family = AF_INET;
334 sin.sin_addr.s_addr = addr;
335
336 /* rdma_bind_addr will only succeed for IB & iWARP devices */
337 ret = rdma_bind_addr(cm_id, (struct sockaddr *)&sin);
338 /* due to this, we will claim to support iWARP devices unless we
339 check node_type. */
340 if (ret || cm_id->device->node_type != RDMA_NODE_IB_CA)
341 ret = -EADDRNOTAVAIL;
342
343 rdsdebug("addr %pI4 ret %d node type %d\n",
344 &addr, ret,
345 cm_id->device ? cm_id->device->node_type : -1);
346
347 rdma_destroy_id(cm_id);
348
349 return ret;
350}
351
352static void rds_ib_unregister_client(void)
353{
354 ib_unregister_client(&rds_ib_client);
355 /* wait for rds_ib_dev_free() to complete */
356 flush_workqueue(rds_wq);
357}
358
359void rds_ib_exit(void)
360{
361 rds_info_deregister_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info);
362 rds_ib_unregister_client();
363 rds_ib_destroy_nodev_conns();
364 rds_ib_sysctl_exit();
365 rds_ib_recv_exit();
366 rds_trans_unregister(&rds_ib_transport);
367}
368
369struct rds_transport rds_ib_transport = {
370 .laddr_check = rds_ib_laddr_check,
371 .xmit_complete = rds_ib_xmit_complete,
372 .xmit = rds_ib_xmit,
373 .xmit_rdma = rds_ib_xmit_rdma,
374 .xmit_atomic = rds_ib_xmit_atomic,
375 .recv = rds_ib_recv,
376 .conn_alloc = rds_ib_conn_alloc,
377 .conn_free = rds_ib_conn_free,
378 .conn_connect = rds_ib_conn_connect,
379 .conn_shutdown = rds_ib_conn_shutdown,
380 .inc_copy_to_user = rds_ib_inc_copy_to_user,
381 .inc_free = rds_ib_inc_free,
382 .cm_initiate_connect = rds_ib_cm_initiate_connect,
383 .cm_handle_connect = rds_ib_cm_handle_connect,
384 .cm_connect_complete = rds_ib_cm_connect_complete,
385 .stats_info_copy = rds_ib_stats_info_copy,
386 .exit = rds_ib_exit,
387 .get_mr = rds_ib_get_mr,
388 .sync_mr = rds_ib_sync_mr,
389 .free_mr = rds_ib_free_mr,
390 .flush_mrs = rds_ib_flush_mrs,
391 .t_owner = THIS_MODULE,
392 .t_name = "infiniband",
393 .t_type = RDS_TRANS_IB
394};
395
396int rds_ib_init(void)
397{
398 int ret;
399
400 INIT_LIST_HEAD(&rds_ib_devices);
401
402 ret = ib_register_client(&rds_ib_client);
403 if (ret)
404 goto out;
405
406 ret = rds_ib_sysctl_init();
407 if (ret)
408 goto out_ibreg;
409
410 ret = rds_ib_recv_init();
411 if (ret)
412 goto out_sysctl;
413
414 ret = rds_trans_register(&rds_ib_transport);
415 if (ret)
416 goto out_recv;
417
418 rds_info_register_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info);
419
420 goto out;
421
422out_recv:
423 rds_ib_recv_exit();
424out_sysctl:
425 rds_ib_sysctl_exit();
426out_ibreg:
427 rds_ib_unregister_client();
428out:
429 return ret;
430}
431
432MODULE_LICENSE("GPL");
433