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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
48static unsigned int rds_ib_mr_1m_pool_size = RDS_MR_1M_POOL_SIZE;
49static unsigned int rds_ib_mr_8k_pool_size = RDS_MR_8K_POOL_SIZE;
50unsigned int rds_ib_retry_count = RDS_IB_DEFAULT_RETRY_COUNT;
51static atomic_t rds_ib_unloading;
52
53module_param(rds_ib_mr_1m_pool_size, int, 0444);
54MODULE_PARM_DESC(rds_ib_mr_1m_pool_size, " Max number of 1M mr per HCA");
55module_param(rds_ib_mr_8k_pool_size, int, 0444);
56MODULE_PARM_DESC(rds_ib_mr_8k_pool_size, " Max number of 8K mr per HCA");
57module_param(rds_ib_retry_count, int, 0444);
58MODULE_PARM_DESC(rds_ib_retry_count, " Number of hw retries before reporting an error");
59
60
61
62
63
64
65DECLARE_RWSEM(rds_ib_devices_lock);
66struct list_head rds_ib_devices;
67
68
69DEFINE_SPINLOCK(ib_nodev_conns_lock);
70LIST_HEAD(ib_nodev_conns);
71
72static void rds_ib_nodev_connect(void)
73{
74 struct rds_ib_connection *ic;
75
76 spin_lock(&ib_nodev_conns_lock);
77 list_for_each_entry(ic, &ib_nodev_conns, ib_node)
78 rds_conn_connect_if_down(ic->conn);
79 spin_unlock(&ib_nodev_conns_lock);
80}
81
82static void rds_ib_dev_shutdown(struct rds_ib_device *rds_ibdev)
83{
84 struct rds_ib_connection *ic;
85 unsigned long flags;
86
87 spin_lock_irqsave(&rds_ibdev->spinlock, flags);
88 list_for_each_entry(ic, &rds_ibdev->conn_list, ib_node)
89 rds_conn_drop(ic->conn);
90 spin_unlock_irqrestore(&rds_ibdev->spinlock, flags);
91}
92
93
94
95
96
97static void rds_ib_dev_free(struct work_struct *work)
98{
99 struct rds_ib_ipaddr *i_ipaddr, *i_next;
100 struct rds_ib_device *rds_ibdev = container_of(work,
101 struct rds_ib_device, free_work);
102
103 if (rds_ibdev->mr_8k_pool)
104 rds_ib_destroy_mr_pool(rds_ibdev->mr_8k_pool);
105 if (rds_ibdev->mr_1m_pool)
106 rds_ib_destroy_mr_pool(rds_ibdev->mr_1m_pool);
107 if (rds_ibdev->pd)
108 ib_dealloc_pd(rds_ibdev->pd);
109
110 list_for_each_entry_safe(i_ipaddr, i_next, &rds_ibdev->ipaddr_list, list) {
111 list_del(&i_ipaddr->list);
112 kfree(i_ipaddr);
113 }
114
115 kfree(rds_ibdev->vector_load);
116
117 kfree(rds_ibdev);
118}
119
120void rds_ib_dev_put(struct rds_ib_device *rds_ibdev)
121{
122 BUG_ON(refcount_read(&rds_ibdev->refcount) == 0);
123 if (refcount_dec_and_test(&rds_ibdev->refcount))
124 queue_work(rds_wq, &rds_ibdev->free_work);
125}
126
127static void rds_ib_add_one(struct ib_device *device)
128{
129 struct rds_ib_device *rds_ibdev;
130 bool has_fr, has_fmr;
131
132
133 if (device->node_type != RDMA_NODE_IB_CA)
134 return;
135
136 rds_ibdev = kzalloc_node(sizeof(struct rds_ib_device), GFP_KERNEL,
137 ibdev_to_node(device));
138 if (!rds_ibdev)
139 return;
140
141 spin_lock_init(&rds_ibdev->spinlock);
142 refcount_set(&rds_ibdev->refcount, 1);
143 INIT_WORK(&rds_ibdev->free_work, rds_ib_dev_free);
144
145 rds_ibdev->max_wrs = device->attrs.max_qp_wr;
146 rds_ibdev->max_sge = min(device->attrs.max_sge, RDS_IB_MAX_SGE);
147
148 has_fr = (device->attrs.device_cap_flags &
149 IB_DEVICE_MEM_MGT_EXTENSIONS);
150 has_fmr = (device->alloc_fmr && device->dealloc_fmr &&
151 device->map_phys_fmr && device->unmap_fmr);
152 rds_ibdev->use_fastreg = (has_fr && !has_fmr);
153
154 rds_ibdev->fmr_max_remaps = device->attrs.max_map_per_fmr?: 32;
155 rds_ibdev->max_1m_mrs = device->attrs.max_mr ?
156 min_t(unsigned int, (device->attrs.max_mr / 2),
157 rds_ib_mr_1m_pool_size) : rds_ib_mr_1m_pool_size;
158
159 rds_ibdev->max_8k_mrs = device->attrs.max_mr ?
160 min_t(unsigned int, ((device->attrs.max_mr / 2) * RDS_MR_8K_SCALE),
161 rds_ib_mr_8k_pool_size) : rds_ib_mr_8k_pool_size;
162
163 rds_ibdev->max_initiator_depth = device->attrs.max_qp_init_rd_atom;
164 rds_ibdev->max_responder_resources = device->attrs.max_qp_rd_atom;
165
166 rds_ibdev->vector_load = kzalloc(sizeof(int) * device->num_comp_vectors,
167 GFP_KERNEL);
168 if (!rds_ibdev->vector_load) {
169 pr_err("RDS/IB: %s failed to allocate vector memory\n",
170 __func__);
171 goto put_dev;
172 }
173
174 rds_ibdev->dev = device;
175 rds_ibdev->pd = ib_alloc_pd(device, 0);
176 if (IS_ERR(rds_ibdev->pd)) {
177 rds_ibdev->pd = NULL;
178 goto put_dev;
179 }
180
181 rds_ibdev->mr_1m_pool =
182 rds_ib_create_mr_pool(rds_ibdev, RDS_IB_MR_1M_POOL);
183 if (IS_ERR(rds_ibdev->mr_1m_pool)) {
184 rds_ibdev->mr_1m_pool = NULL;
185 goto put_dev;
186 }
187
188 rds_ibdev->mr_8k_pool =
189 rds_ib_create_mr_pool(rds_ibdev, RDS_IB_MR_8K_POOL);
190 if (IS_ERR(rds_ibdev->mr_8k_pool)) {
191 rds_ibdev->mr_8k_pool = NULL;
192 goto put_dev;
193 }
194
195 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",
196 device->attrs.max_fmr, rds_ibdev->max_wrs, rds_ibdev->max_sge,
197 rds_ibdev->fmr_max_remaps, rds_ibdev->max_1m_mrs,
198 rds_ibdev->max_8k_mrs);
199
200 pr_info("RDS/IB: %s: %s supported and preferred\n",
201 device->name,
202 rds_ibdev->use_fastreg ? "FRMR" : "FMR");
203
204 INIT_LIST_HEAD(&rds_ibdev->ipaddr_list);
205 INIT_LIST_HEAD(&rds_ibdev->conn_list);
206
207 down_write(&rds_ib_devices_lock);
208 list_add_tail_rcu(&rds_ibdev->list, &rds_ib_devices);
209 up_write(&rds_ib_devices_lock);
210 refcount_inc(&rds_ibdev->refcount);
211
212 ib_set_client_data(device, &rds_ib_client, rds_ibdev);
213 refcount_inc(&rds_ibdev->refcount);
214
215 rds_ib_nodev_connect();
216
217put_dev:
218 rds_ib_dev_put(rds_ibdev);
219}
220
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236
237struct rds_ib_device *rds_ib_get_client_data(struct ib_device *device)
238{
239 struct rds_ib_device *rds_ibdev;
240
241 rcu_read_lock();
242 rds_ibdev = ib_get_client_data(device, &rds_ib_client);
243 if (rds_ibdev)
244 refcount_inc(&rds_ibdev->refcount);
245 rcu_read_unlock();
246 return rds_ibdev;
247}
248
249
250
251
252
253
254
255
256static void rds_ib_remove_one(struct ib_device *device, void *client_data)
257{
258 struct rds_ib_device *rds_ibdev = client_data;
259
260 if (!rds_ibdev)
261 return;
262
263 rds_ib_dev_shutdown(rds_ibdev);
264
265
266 ib_set_client_data(device, &rds_ib_client, NULL);
267
268 down_write(&rds_ib_devices_lock);
269 list_del_rcu(&rds_ibdev->list);
270 up_write(&rds_ib_devices_lock);
271
272
273
274
275
276
277 synchronize_rcu();
278 rds_ib_dev_put(rds_ibdev);
279 rds_ib_dev_put(rds_ibdev);
280}
281
282struct ib_client rds_ib_client = {
283 .name = "rds_ib",
284 .add = rds_ib_add_one,
285 .remove = rds_ib_remove_one
286};
287
288static int rds_ib_conn_info_visitor(struct rds_connection *conn,
289 void *buffer)
290{
291 struct rds_info_rdma_connection *iinfo = buffer;
292 struct rds_ib_connection *ic;
293
294
295 if (conn->c_trans != &rds_ib_transport)
296 return 0;
297
298 iinfo->src_addr = conn->c_laddr;
299 iinfo->dst_addr = conn->c_faddr;
300
301 memset(&iinfo->src_gid, 0, sizeof(iinfo->src_gid));
302 memset(&iinfo->dst_gid, 0, sizeof(iinfo->dst_gid));
303 if (rds_conn_state(conn) == RDS_CONN_UP) {
304 struct rds_ib_device *rds_ibdev;
305
306 ic = conn->c_transport_data;
307
308 rdma_read_gids(ic->i_cm_id, (union ib_gid *)&iinfo->src_gid,
309 (union ib_gid *)&iinfo->dst_gid);
310
311 rds_ibdev = ic->rds_ibdev;
312 iinfo->max_send_wr = ic->i_send_ring.w_nr;
313 iinfo->max_recv_wr = ic->i_recv_ring.w_nr;
314 iinfo->max_send_sge = rds_ibdev->max_sge;
315 rds_ib_get_mr_info(rds_ibdev, iinfo);
316 }
317 return 1;
318}
319
320static void rds_ib_ic_info(struct socket *sock, unsigned int len,
321 struct rds_info_iterator *iter,
322 struct rds_info_lengths *lens)
323{
324 rds_for_each_conn_info(sock, len, iter, lens,
325 rds_ib_conn_info_visitor,
326 sizeof(struct rds_info_rdma_connection));
327}
328
329
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336
337
338
339
340static int rds_ib_laddr_check(struct net *net, __be32 addr)
341{
342 int ret;
343 struct rdma_cm_id *cm_id;
344 struct sockaddr_in sin;
345
346
347
348
349 cm_id = rdma_create_id(&init_net, rds_rdma_cm_event_handler,
350 NULL, RDMA_PS_TCP, IB_QPT_RC);
351 if (IS_ERR(cm_id))
352 return PTR_ERR(cm_id);
353
354 memset(&sin, 0, sizeof(sin));
355 sin.sin_family = AF_INET;
356 sin.sin_addr.s_addr = addr;
357
358
359 ret = rdma_bind_addr(cm_id, (struct sockaddr *)&sin);
360
361
362 if (ret || !cm_id->device ||
363 cm_id->device->node_type != RDMA_NODE_IB_CA)
364 ret = -EADDRNOTAVAIL;
365
366 rdsdebug("addr %pI4 ret %d node type %d\n",
367 &addr, ret,
368 cm_id->device ? cm_id->device->node_type : -1);
369
370 rdma_destroy_id(cm_id);
371
372 return ret;
373}
374
375static void rds_ib_unregister_client(void)
376{
377 ib_unregister_client(&rds_ib_client);
378
379 flush_workqueue(rds_wq);
380}
381
382static void rds_ib_set_unloading(void)
383{
384 atomic_set(&rds_ib_unloading, 1);
385}
386
387static bool rds_ib_is_unloading(struct rds_connection *conn)
388{
389 struct rds_conn_path *cp = &conn->c_path[0];
390
391 return (test_bit(RDS_DESTROY_PENDING, &cp->cp_flags) ||
392 atomic_read(&rds_ib_unloading) != 0);
393}
394
395void rds_ib_exit(void)
396{
397 rds_ib_set_unloading();
398 synchronize_rcu();
399 rds_info_deregister_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info);
400 rds_ib_unregister_client();
401 rds_ib_destroy_nodev_conns();
402 rds_ib_sysctl_exit();
403 rds_ib_recv_exit();
404 rds_trans_unregister(&rds_ib_transport);
405 rds_ib_mr_exit();
406}
407
408struct rds_transport rds_ib_transport = {
409 .laddr_check = rds_ib_laddr_check,
410 .xmit_path_complete = rds_ib_xmit_path_complete,
411 .xmit = rds_ib_xmit,
412 .xmit_rdma = rds_ib_xmit_rdma,
413 .xmit_atomic = rds_ib_xmit_atomic,
414 .recv_path = rds_ib_recv_path,
415 .conn_alloc = rds_ib_conn_alloc,
416 .conn_free = rds_ib_conn_free,
417 .conn_path_connect = rds_ib_conn_path_connect,
418 .conn_path_shutdown = rds_ib_conn_path_shutdown,
419 .inc_copy_to_user = rds_ib_inc_copy_to_user,
420 .inc_free = rds_ib_inc_free,
421 .cm_initiate_connect = rds_ib_cm_initiate_connect,
422 .cm_handle_connect = rds_ib_cm_handle_connect,
423 .cm_connect_complete = rds_ib_cm_connect_complete,
424 .stats_info_copy = rds_ib_stats_info_copy,
425 .exit = rds_ib_exit,
426 .get_mr = rds_ib_get_mr,
427 .sync_mr = rds_ib_sync_mr,
428 .free_mr = rds_ib_free_mr,
429 .flush_mrs = rds_ib_flush_mrs,
430 .t_owner = THIS_MODULE,
431 .t_name = "infiniband",
432 .t_unloading = rds_ib_is_unloading,
433 .t_type = RDS_TRANS_IB
434};
435
436int rds_ib_init(void)
437{
438 int ret;
439
440 INIT_LIST_HEAD(&rds_ib_devices);
441
442 ret = rds_ib_mr_init();
443 if (ret)
444 goto out;
445
446 ret = ib_register_client(&rds_ib_client);
447 if (ret)
448 goto out_mr_exit;
449
450 ret = rds_ib_sysctl_init();
451 if (ret)
452 goto out_ibreg;
453
454 ret = rds_ib_recv_init();
455 if (ret)
456 goto out_sysctl;
457
458 rds_trans_register(&rds_ib_transport);
459
460 rds_info_register_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info);
461
462 goto out;
463
464out_sysctl:
465 rds_ib_sysctl_exit();
466out_ibreg:
467 rds_ib_unregister_client();
468out_mr_exit:
469 rds_ib_mr_exit();
470out:
471 return ret;
472}
473
474MODULE_LICENSE("GPL");
475
476