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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
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
1/*
2 * Copyright (c) 2006, 2018 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
49static unsigned int rds_ib_mr_1m_pool_size = RDS_MR_1M_POOL_SIZE;
50static unsigned int rds_ib_mr_8k_pool_size = RDS_MR_8K_POOL_SIZE;
51unsigned int rds_ib_retry_count = RDS_IB_DEFAULT_RETRY_COUNT;
52static atomic_t rds_ib_unloading;
53
54module_param(rds_ib_mr_1m_pool_size, int, 0444);
55MODULE_PARM_DESC(rds_ib_mr_1m_pool_size, " Max number of 1M mr per HCA");
56module_param(rds_ib_mr_8k_pool_size, int, 0444);
57MODULE_PARM_DESC(rds_ib_mr_8k_pool_size, " Max number of 8K mr per HCA");
58module_param(rds_ib_retry_count, int, 0444);
59MODULE_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 */
66DECLARE_RWSEM(rds_ib_devices_lock);
67struct list_head rds_ib_devices;
68
69/* NOTE: if also grabbing ibdev lock, grab this first */
70DEFINE_SPINLOCK(ib_nodev_conns_lock);
71LIST_HEAD(ib_nodev_conns);
72
73static 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
83static 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 */
98static 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
121void 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
128static void rds_ib_add_one(struct ib_device *device)
129{
130 struct rds_ib_device *rds_ibdev;
131 bool has_fr, has_fmr;
132
133 /* Only handle IB (no iWARP) devices */
134 if (device->node_type != RDMA_NODE_IB_CA)
135 return;
136
137 rds_ibdev = kzalloc_node(sizeof(struct rds_ib_device), GFP_KERNEL,
138 ibdev_to_node(device));
139 if (!rds_ibdev)
140 return;
141
142 spin_lock_init(&rds_ibdev->spinlock);
143 refcount_set(&rds_ibdev->refcount, 1);
144 INIT_WORK(&rds_ibdev->free_work, rds_ib_dev_free);
145
146 INIT_LIST_HEAD(&rds_ibdev->ipaddr_list);
147 INIT_LIST_HEAD(&rds_ibdev->conn_list);
148
149 rds_ibdev->max_wrs = device->attrs.max_qp_wr;
150 rds_ibdev->max_sge = min(device->attrs.max_send_sge, RDS_IB_MAX_SGE);
151
152 has_fr = (device->attrs.device_cap_flags &
153 IB_DEVICE_MEM_MGT_EXTENSIONS);
154 has_fmr = (device->ops.alloc_fmr && device->ops.dealloc_fmr &&
155 device->ops.map_phys_fmr && device->ops.unmap_fmr);
156 rds_ibdev->use_fastreg = (has_fr && !has_fmr);
157
158 rds_ibdev->fmr_max_remaps = device->attrs.max_map_per_fmr?: 32;
159 rds_ibdev->max_1m_mrs = device->attrs.max_mr ?
160 min_t(unsigned int, (device->attrs.max_mr / 2),
161 rds_ib_mr_1m_pool_size) : rds_ib_mr_1m_pool_size;
162
163 rds_ibdev->max_8k_mrs = device->attrs.max_mr ?
164 min_t(unsigned int, ((device->attrs.max_mr / 2) * RDS_MR_8K_SCALE),
165 rds_ib_mr_8k_pool_size) : rds_ib_mr_8k_pool_size;
166
167 rds_ibdev->max_initiator_depth = device->attrs.max_qp_init_rd_atom;
168 rds_ibdev->max_responder_resources = device->attrs.max_qp_rd_atom;
169
170 rds_ibdev->vector_load = kcalloc(device->num_comp_vectors,
171 sizeof(int),
172 GFP_KERNEL);
173 if (!rds_ibdev->vector_load) {
174 pr_err("RDS/IB: %s failed to allocate vector memory\n",
175 __func__);
176 goto put_dev;
177 }
178
179 rds_ibdev->dev = device;
180 rds_ibdev->pd = ib_alloc_pd(device, 0);
181 if (IS_ERR(rds_ibdev->pd)) {
182 rds_ibdev->pd = NULL;
183 goto put_dev;
184 }
185
186 rds_ibdev->mr_1m_pool =
187 rds_ib_create_mr_pool(rds_ibdev, RDS_IB_MR_1M_POOL);
188 if (IS_ERR(rds_ibdev->mr_1m_pool)) {
189 rds_ibdev->mr_1m_pool = NULL;
190 goto put_dev;
191 }
192
193 rds_ibdev->mr_8k_pool =
194 rds_ib_create_mr_pool(rds_ibdev, RDS_IB_MR_8K_POOL);
195 if (IS_ERR(rds_ibdev->mr_8k_pool)) {
196 rds_ibdev->mr_8k_pool = NULL;
197 goto put_dev;
198 }
199
200 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",
201 device->attrs.max_fmr, rds_ibdev->max_wrs, rds_ibdev->max_sge,
202 rds_ibdev->fmr_max_remaps, rds_ibdev->max_1m_mrs,
203 rds_ibdev->max_8k_mrs);
204
205 pr_info("RDS/IB: %s: %s supported and preferred\n",
206 device->name,
207 rds_ibdev->use_fastreg ? "FRMR" : "FMR");
208
209 down_write(&rds_ib_devices_lock);
210 list_add_tail_rcu(&rds_ibdev->list, &rds_ib_devices);
211 up_write(&rds_ib_devices_lock);
212 refcount_inc(&rds_ibdev->refcount);
213
214 ib_set_client_data(device, &rds_ib_client, rds_ibdev);
215 refcount_inc(&rds_ibdev->refcount);
216
217 rds_ib_nodev_connect();
218
219put_dev:
220 rds_ib_dev_put(rds_ibdev);
221}
222
223/*
224 * New connections use this to find the device to associate with the
225 * connection. It's not in the fast path so we're not concerned about the
226 * performance of the IB call. (As of this writing, it uses an interrupt
227 * blocking spinlock to serialize walking a per-device list of all registered
228 * clients.)
229 *
230 * RCU is used to handle incoming connections racing with device teardown.
231 * Rather than use a lock to serialize removal from the client_data and
232 * getting a new reference, we use an RCU grace period. The destruction
233 * path removes the device from client_data and then waits for all RCU
234 * readers to finish.
235 *
236 * A new connection can get NULL from this if its arriving on a
237 * device that is in the process of being removed.
238 */
239struct rds_ib_device *rds_ib_get_client_data(struct ib_device *device)
240{
241 struct rds_ib_device *rds_ibdev;
242
243 rcu_read_lock();
244 rds_ibdev = ib_get_client_data(device, &rds_ib_client);
245 if (rds_ibdev)
246 refcount_inc(&rds_ibdev->refcount);
247 rcu_read_unlock();
248 return rds_ibdev;
249}
250
251/*
252 * The IB stack is letting us know that a device is going away. This can
253 * happen if the underlying HCA driver is removed or if PCI hotplug is removing
254 * the pci function, for example.
255 *
256 * This can be called at any time and can be racing with any other RDS path.
257 */
258static void rds_ib_remove_one(struct ib_device *device, void *client_data)
259{
260 struct rds_ib_device *rds_ibdev = client_data;
261
262 if (!rds_ibdev)
263 return;
264
265 rds_ib_dev_shutdown(rds_ibdev);
266
267 /* stop connection attempts from getting a reference to this device. */
268 ib_set_client_data(device, &rds_ib_client, NULL);
269
270 down_write(&rds_ib_devices_lock);
271 list_del_rcu(&rds_ibdev->list);
272 up_write(&rds_ib_devices_lock);
273
274 /*
275 * This synchronize rcu is waiting for readers of both the ib
276 * client data and the devices list to finish before we drop
277 * both of those references.
278 */
279 synchronize_rcu();
280 rds_ib_dev_put(rds_ibdev);
281 rds_ib_dev_put(rds_ibdev);
282}
283
284struct ib_client rds_ib_client = {
285 .name = "rds_ib",
286 .add = rds_ib_add_one,
287 .remove = rds_ib_remove_one
288};
289
290static int rds_ib_conn_info_visitor(struct rds_connection *conn,
291 void *buffer)
292{
293 struct rds_info_rdma_connection *iinfo = buffer;
294 struct rds_ib_connection *ic = conn->c_transport_data;
295
296 /* We will only ever look at IB transports */
297 if (conn->c_trans != &rds_ib_transport)
298 return 0;
299 if (conn->c_isv6)
300 return 0;
301
302 iinfo->src_addr = conn->c_laddr.s6_addr32[3];
303 iinfo->dst_addr = conn->c_faddr.s6_addr32[3];
304 if (ic) {
305 iinfo->tos = conn->c_tos;
306 iinfo->sl = ic->i_sl;
307 }
308
309 memset(&iinfo->src_gid, 0, sizeof(iinfo->src_gid));
310 memset(&iinfo->dst_gid, 0, sizeof(iinfo->dst_gid));
311 if (rds_conn_state(conn) == RDS_CONN_UP) {
312 struct rds_ib_device *rds_ibdev;
313
314 rdma_read_gids(ic->i_cm_id, (union ib_gid *)&iinfo->src_gid,
315 (union ib_gid *)&iinfo->dst_gid);
316
317 rds_ibdev = ic->rds_ibdev;
318 iinfo->max_send_wr = ic->i_send_ring.w_nr;
319 iinfo->max_recv_wr = ic->i_recv_ring.w_nr;
320 iinfo->max_send_sge = rds_ibdev->max_sge;
321 rds_ib_get_mr_info(rds_ibdev, iinfo);
322 iinfo->cache_allocs = atomic_read(&ic->i_cache_allocs);
323 }
324 return 1;
325}
326
327#if IS_ENABLED(CONFIG_IPV6)
328/* IPv6 version of rds_ib_conn_info_visitor(). */
329static int rds6_ib_conn_info_visitor(struct rds_connection *conn,
330 void *buffer)
331{
332 struct rds6_info_rdma_connection *iinfo6 = buffer;
333 struct rds_ib_connection *ic = conn->c_transport_data;
334
335 /* We will only ever look at IB transports */
336 if (conn->c_trans != &rds_ib_transport)
337 return 0;
338
339 iinfo6->src_addr = conn->c_laddr;
340 iinfo6->dst_addr = conn->c_faddr;
341 if (ic) {
342 iinfo6->tos = conn->c_tos;
343 iinfo6->sl = ic->i_sl;
344 }
345
346 memset(&iinfo6->src_gid, 0, sizeof(iinfo6->src_gid));
347 memset(&iinfo6->dst_gid, 0, sizeof(iinfo6->dst_gid));
348
349 if (rds_conn_state(conn) == RDS_CONN_UP) {
350 struct rds_ib_device *rds_ibdev;
351
352 rdma_read_gids(ic->i_cm_id, (union ib_gid *)&iinfo6->src_gid,
353 (union ib_gid *)&iinfo6->dst_gid);
354 rds_ibdev = ic->rds_ibdev;
355 iinfo6->max_send_wr = ic->i_send_ring.w_nr;
356 iinfo6->max_recv_wr = ic->i_recv_ring.w_nr;
357 iinfo6->max_send_sge = rds_ibdev->max_sge;
358 rds6_ib_get_mr_info(rds_ibdev, iinfo6);
359 iinfo6->cache_allocs = atomic_read(&ic->i_cache_allocs);
360 }
361 return 1;
362}
363#endif
364
365static void rds_ib_ic_info(struct socket *sock, unsigned int len,
366 struct rds_info_iterator *iter,
367 struct rds_info_lengths *lens)
368{
369 u64 buffer[(sizeof(struct rds_info_rdma_connection) + 7) / 8];
370
371 rds_for_each_conn_info(sock, len, iter, lens,
372 rds_ib_conn_info_visitor,
373 buffer,
374 sizeof(struct rds_info_rdma_connection));
375}
376
377#if IS_ENABLED(CONFIG_IPV6)
378/* IPv6 version of rds_ib_ic_info(). */
379static void rds6_ib_ic_info(struct socket *sock, unsigned int len,
380 struct rds_info_iterator *iter,
381 struct rds_info_lengths *lens)
382{
383 u64 buffer[(sizeof(struct rds6_info_rdma_connection) + 7) / 8];
384
385 rds_for_each_conn_info(sock, len, iter, lens,
386 rds6_ib_conn_info_visitor,
387 buffer,
388 sizeof(struct rds6_info_rdma_connection));
389}
390#endif
391
392/*
393 * Early RDS/IB was built to only bind to an address if there is an IPoIB
394 * device with that address set.
395 *
396 * If it were me, I'd advocate for something more flexible. Sending and
397 * receiving should be device-agnostic. Transports would try and maintain
398 * connections between peers who have messages queued. Userspace would be
399 * allowed to influence which paths have priority. We could call userspace
400 * asserting this policy "routing".
401 */
402static int rds_ib_laddr_check(struct net *net, const struct in6_addr *addr,
403 __u32 scope_id)
404{
405 int ret;
406 struct rdma_cm_id *cm_id;
407#if IS_ENABLED(CONFIG_IPV6)
408 struct sockaddr_in6 sin6;
409#endif
410 struct sockaddr_in sin;
411 struct sockaddr *sa;
412 bool isv4;
413
414 isv4 = ipv6_addr_v4mapped(addr);
415 /* Create a CMA ID and try to bind it. This catches both
416 * IB and iWARP capable NICs.
417 */
418 cm_id = rdma_create_id(&init_net, rds_rdma_cm_event_handler,
419 NULL, RDMA_PS_TCP, IB_QPT_RC);
420 if (IS_ERR(cm_id))
421 return PTR_ERR(cm_id);
422
423 if (isv4) {
424 memset(&sin, 0, sizeof(sin));
425 sin.sin_family = AF_INET;
426 sin.sin_addr.s_addr = addr->s6_addr32[3];
427 sa = (struct sockaddr *)&sin;
428 } else {
429#if IS_ENABLED(CONFIG_IPV6)
430 memset(&sin6, 0, sizeof(sin6));
431 sin6.sin6_family = AF_INET6;
432 sin6.sin6_addr = *addr;
433 sin6.sin6_scope_id = scope_id;
434 sa = (struct sockaddr *)&sin6;
435
436 /* XXX Do a special IPv6 link local address check here. The
437 * reason is that rdma_bind_addr() always succeeds with IPv6
438 * link local address regardless it is indeed configured in a
439 * system.
440 */
441 if (ipv6_addr_type(addr) & IPV6_ADDR_LINKLOCAL) {
442 struct net_device *dev;
443
444 if (scope_id == 0) {
445 ret = -EADDRNOTAVAIL;
446 goto out;
447 }
448
449 /* Use init_net for now as RDS is not network
450 * name space aware.
451 */
452 dev = dev_get_by_index(&init_net, scope_id);
453 if (!dev) {
454 ret = -EADDRNOTAVAIL;
455 goto out;
456 }
457 if (!ipv6_chk_addr(&init_net, addr, dev, 1)) {
458 dev_put(dev);
459 ret = -EADDRNOTAVAIL;
460 goto out;
461 }
462 dev_put(dev);
463 }
464#else
465 ret = -EADDRNOTAVAIL;
466 goto out;
467#endif
468 }
469
470 /* rdma_bind_addr will only succeed for IB & iWARP devices */
471 ret = rdma_bind_addr(cm_id, sa);
472 /* due to this, we will claim to support iWARP devices unless we
473 check node_type. */
474 if (ret || !cm_id->device ||
475 cm_id->device->node_type != RDMA_NODE_IB_CA)
476 ret = -EADDRNOTAVAIL;
477
478 rdsdebug("addr %pI6c%%%u ret %d node type %d\n",
479 addr, scope_id, ret,
480 cm_id->device ? cm_id->device->node_type : -1);
481
482out:
483 rdma_destroy_id(cm_id);
484
485 return ret;
486}
487
488static void rds_ib_unregister_client(void)
489{
490 ib_unregister_client(&rds_ib_client);
491 /* wait for rds_ib_dev_free() to complete */
492 flush_workqueue(rds_wq);
493}
494
495static void rds_ib_set_unloading(void)
496{
497 atomic_set(&rds_ib_unloading, 1);
498}
499
500static bool rds_ib_is_unloading(struct rds_connection *conn)
501{
502 struct rds_conn_path *cp = &conn->c_path[0];
503
504 return (test_bit(RDS_DESTROY_PENDING, &cp->cp_flags) ||
505 atomic_read(&rds_ib_unloading) != 0);
506}
507
508void rds_ib_exit(void)
509{
510 rds_ib_set_unloading();
511 synchronize_rcu();
512 rds_info_deregister_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info);
513#if IS_ENABLED(CONFIG_IPV6)
514 rds_info_deregister_func(RDS6_INFO_IB_CONNECTIONS, rds6_ib_ic_info);
515#endif
516 rds_ib_unregister_client();
517 rds_ib_destroy_nodev_conns();
518 rds_ib_sysctl_exit();
519 rds_ib_recv_exit();
520 rds_trans_unregister(&rds_ib_transport);
521 rds_ib_mr_exit();
522}
523
524static u8 rds_ib_get_tos_map(u8 tos)
525{
526 /* 1:1 user to transport map for RDMA transport.
527 * In future, if custom map is desired, hook can export
528 * user configurable map.
529 */
530 return tos;
531}
532
533struct rds_transport rds_ib_transport = {
534 .laddr_check = rds_ib_laddr_check,
535 .xmit_path_complete = rds_ib_xmit_path_complete,
536 .xmit = rds_ib_xmit,
537 .xmit_rdma = rds_ib_xmit_rdma,
538 .xmit_atomic = rds_ib_xmit_atomic,
539 .recv_path = rds_ib_recv_path,
540 .conn_alloc = rds_ib_conn_alloc,
541 .conn_free = rds_ib_conn_free,
542 .conn_path_connect = rds_ib_conn_path_connect,
543 .conn_path_shutdown = rds_ib_conn_path_shutdown,
544 .inc_copy_to_user = rds_ib_inc_copy_to_user,
545 .inc_free = rds_ib_inc_free,
546 .cm_initiate_connect = rds_ib_cm_initiate_connect,
547 .cm_handle_connect = rds_ib_cm_handle_connect,
548 .cm_connect_complete = rds_ib_cm_connect_complete,
549 .stats_info_copy = rds_ib_stats_info_copy,
550 .exit = rds_ib_exit,
551 .get_mr = rds_ib_get_mr,
552 .sync_mr = rds_ib_sync_mr,
553 .free_mr = rds_ib_free_mr,
554 .flush_mrs = rds_ib_flush_mrs,
555 .get_tos_map = rds_ib_get_tos_map,
556 .t_owner = THIS_MODULE,
557 .t_name = "infiniband",
558 .t_unloading = rds_ib_is_unloading,
559 .t_type = RDS_TRANS_IB
560};
561
562int rds_ib_init(void)
563{
564 int ret;
565
566 INIT_LIST_HEAD(&rds_ib_devices);
567
568 ret = rds_ib_mr_init();
569 if (ret)
570 goto out;
571
572 ret = ib_register_client(&rds_ib_client);
573 if (ret)
574 goto out_mr_exit;
575
576 ret = rds_ib_sysctl_init();
577 if (ret)
578 goto out_ibreg;
579
580 ret = rds_ib_recv_init();
581 if (ret)
582 goto out_sysctl;
583
584 rds_trans_register(&rds_ib_transport);
585
586 rds_info_register_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info);
587#if IS_ENABLED(CONFIG_IPV6)
588 rds_info_register_func(RDS6_INFO_IB_CONNECTIONS, rds6_ib_ic_info);
589#endif
590
591 goto out;
592
593out_sysctl:
594 rds_ib_sysctl_exit();
595out_ibreg:
596 rds_ib_unregister_client();
597out_mr_exit:
598 rds_ib_mr_exit();
599out:
600 return ret;
601}
602
603MODULE_LICENSE("GPL");