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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.h"
44#include "ib.h"
45
46static unsigned int fmr_pool_size = RDS_FMR_POOL_SIZE;
47unsigned int fmr_message_size = RDS_FMR_SIZE + 1;
48unsigned int rds_ib_retry_count = RDS_IB_DEFAULT_RETRY_COUNT;
49
50module_param(fmr_pool_size, int, 0444);
51MODULE_PARM_DESC(fmr_pool_size, " Max number of fmr per HCA");
52module_param(fmr_message_size, int, 0444);
53MODULE_PARM_DESC(fmr_message_size, " Max size of a RDMA transfer");
54module_param(rds_ib_retry_count, int, 0444);
55MODULE_PARM_DESC(rds_ib_retry_count, " Number of hw retries before reporting an error");
56
57
58
59
60
61
62DECLARE_RWSEM(rds_ib_devices_lock);
63struct list_head rds_ib_devices;
64
65
66DEFINE_SPINLOCK(ib_nodev_conns_lock);
67LIST_HEAD(ib_nodev_conns);
68
69static void rds_ib_nodev_connect(void)
70{
71 struct rds_ib_connection *ic;
72
73 spin_lock(&ib_nodev_conns_lock);
74 list_for_each_entry(ic, &ib_nodev_conns, ib_node)
75 rds_conn_connect_if_down(ic->conn);
76 spin_unlock(&ib_nodev_conns_lock);
77}
78
79static void rds_ib_dev_shutdown(struct rds_ib_device *rds_ibdev)
80{
81 struct rds_ib_connection *ic;
82 unsigned long flags;
83
84 spin_lock_irqsave(&rds_ibdev->spinlock, flags);
85 list_for_each_entry(ic, &rds_ibdev->conn_list, ib_node)
86 rds_conn_drop(ic->conn);
87 spin_unlock_irqrestore(&rds_ibdev->spinlock, flags);
88}
89
90
91
92
93
94static void rds_ib_dev_free(struct work_struct *work)
95{
96 struct rds_ib_ipaddr *i_ipaddr, *i_next;
97 struct rds_ib_device *rds_ibdev = container_of(work,
98 struct rds_ib_device, free_work);
99
100 if (rds_ibdev->mr_pool)
101 rds_ib_destroy_mr_pool(rds_ibdev->mr_pool);
102 if (rds_ibdev->mr)
103 ib_dereg_mr(rds_ibdev->mr);
104 if (rds_ibdev->pd)
105 ib_dealloc_pd(rds_ibdev->pd);
106
107 list_for_each_entry_safe(i_ipaddr, i_next, &rds_ibdev->ipaddr_list, list) {
108 list_del(&i_ipaddr->list);
109 kfree(i_ipaddr);
110 }
111
112 kfree(rds_ibdev);
113}
114
115void rds_ib_dev_put(struct rds_ib_device *rds_ibdev)
116{
117 BUG_ON(atomic_read(&rds_ibdev->refcount) <= 0);
118 if (atomic_dec_and_test(&rds_ibdev->refcount))
119 queue_work(rds_wq, &rds_ibdev->free_work);
120}
121
122static void rds_ib_add_one(struct ib_device *device)
123{
124 struct rds_ib_device *rds_ibdev;
125 struct ib_device_attr *dev_attr;
126
127
128 if (device->node_type != RDMA_NODE_IB_CA)
129 return;
130
131 dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
132 if (!dev_attr)
133 return;
134
135 if (ib_query_device(device, dev_attr)) {
136 rdsdebug("Query device failed for %s\n", device->name);
137 goto free_attr;
138 }
139
140 rds_ibdev = kzalloc_node(sizeof(struct rds_ib_device), GFP_KERNEL,
141 ibdev_to_node(device));
142 if (!rds_ibdev)
143 goto free_attr;
144
145 spin_lock_init(&rds_ibdev->spinlock);
146 atomic_set(&rds_ibdev->refcount, 1);
147 INIT_WORK(&rds_ibdev->free_work, rds_ib_dev_free);
148
149 rds_ibdev->max_wrs = dev_attr->max_qp_wr;
150 rds_ibdev->max_sge = min(dev_attr->max_sge, RDS_IB_MAX_SGE);
151
152 rds_ibdev->fmr_max_remaps = dev_attr->max_map_per_fmr?: 32;
153 rds_ibdev->max_fmrs = dev_attr->max_fmr ?
154 min_t(unsigned int, dev_attr->max_fmr, fmr_pool_size) :
155 fmr_pool_size;
156
157 rds_ibdev->max_initiator_depth = dev_attr->max_qp_init_rd_atom;
158 rds_ibdev->max_responder_resources = dev_attr->max_qp_rd_atom;
159
160 rds_ibdev->dev = device;
161 rds_ibdev->pd = ib_alloc_pd(device);
162 if (IS_ERR(rds_ibdev->pd)) {
163 rds_ibdev->pd = NULL;
164 goto put_dev;
165 }
166
167 rds_ibdev->mr = ib_get_dma_mr(rds_ibdev->pd, IB_ACCESS_LOCAL_WRITE);
168 if (IS_ERR(rds_ibdev->mr)) {
169 rds_ibdev->mr = NULL;
170 goto put_dev;
171 }
172
173 rds_ibdev->mr_pool = rds_ib_create_mr_pool(rds_ibdev);
174 if (IS_ERR(rds_ibdev->mr_pool)) {
175 rds_ibdev->mr_pool = NULL;
176 goto put_dev;
177 }
178
179 INIT_LIST_HEAD(&rds_ibdev->ipaddr_list);
180 INIT_LIST_HEAD(&rds_ibdev->conn_list);
181
182 down_write(&rds_ib_devices_lock);
183 list_add_tail_rcu(&rds_ibdev->list, &rds_ib_devices);
184 up_write(&rds_ib_devices_lock);
185 atomic_inc(&rds_ibdev->refcount);
186
187 ib_set_client_data(device, &rds_ib_client, rds_ibdev);
188 atomic_inc(&rds_ibdev->refcount);
189
190 rds_ib_nodev_connect();
191
192put_dev:
193 rds_ib_dev_put(rds_ibdev);
194free_attr:
195 kfree(dev_attr);
196}
197
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211
212
213
214struct rds_ib_device *rds_ib_get_client_data(struct ib_device *device)
215{
216 struct rds_ib_device *rds_ibdev;
217
218 rcu_read_lock();
219 rds_ibdev = ib_get_client_data(device, &rds_ib_client);
220 if (rds_ibdev)
221 atomic_inc(&rds_ibdev->refcount);
222 rcu_read_unlock();
223 return rds_ibdev;
224}
225
226
227
228
229
230
231
232
233static void rds_ib_remove_one(struct ib_device *device)
234{
235 struct rds_ib_device *rds_ibdev;
236
237 rds_ibdev = ib_get_client_data(device, &rds_ib_client);
238 if (!rds_ibdev)
239 return;
240
241 rds_ib_dev_shutdown(rds_ibdev);
242
243
244 ib_set_client_data(device, &rds_ib_client, NULL);
245
246 down_write(&rds_ib_devices_lock);
247 list_del_rcu(&rds_ibdev->list);
248 up_write(&rds_ib_devices_lock);
249
250
251
252
253
254
255 synchronize_rcu();
256 rds_ib_dev_put(rds_ibdev);
257 rds_ib_dev_put(rds_ibdev);
258}
259
260struct ib_client rds_ib_client = {
261 .name = "rds_ib",
262 .add = rds_ib_add_one,
263 .remove = rds_ib_remove_one
264};
265
266static int rds_ib_conn_info_visitor(struct rds_connection *conn,
267 void *buffer)
268{
269 struct rds_info_rdma_connection *iinfo = buffer;
270 struct rds_ib_connection *ic;
271
272
273 if (conn->c_trans != &rds_ib_transport)
274 return 0;
275
276 iinfo->src_addr = conn->c_laddr;
277 iinfo->dst_addr = conn->c_faddr;
278
279 memset(&iinfo->src_gid, 0, sizeof(iinfo->src_gid));
280 memset(&iinfo->dst_gid, 0, sizeof(iinfo->dst_gid));
281 if (rds_conn_state(conn) == RDS_CONN_UP) {
282 struct rds_ib_device *rds_ibdev;
283 struct rdma_dev_addr *dev_addr;
284
285 ic = conn->c_transport_data;
286 dev_addr = &ic->i_cm_id->route.addr.dev_addr;
287
288 rdma_addr_get_sgid(dev_addr, (union ib_gid *) &iinfo->src_gid);
289 rdma_addr_get_dgid(dev_addr, (union ib_gid *) &iinfo->dst_gid);
290
291 rds_ibdev = ic->rds_ibdev;
292 iinfo->max_send_wr = ic->i_send_ring.w_nr;
293 iinfo->max_recv_wr = ic->i_recv_ring.w_nr;
294 iinfo->max_send_sge = rds_ibdev->max_sge;
295 rds_ib_get_mr_info(rds_ibdev, iinfo);
296 }
297 return 1;
298}
299
300static void rds_ib_ic_info(struct socket *sock, unsigned int len,
301 struct rds_info_iterator *iter,
302 struct rds_info_lengths *lens)
303{
304 rds_for_each_conn_info(sock, len, iter, lens,
305 rds_ib_conn_info_visitor,
306 sizeof(struct rds_info_rdma_connection));
307}
308
309
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312
313
314
315
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317
318
319
320static int rds_ib_laddr_check(__be32 addr)
321{
322 int ret;
323 struct rdma_cm_id *cm_id;
324 struct sockaddr_in sin;
325
326
327
328
329 cm_id = rdma_create_id(NULL, NULL, RDMA_PS_TCP, IB_QPT_RC);
330 if (IS_ERR(cm_id))
331 return PTR_ERR(cm_id);
332
333 memset(&sin, 0, sizeof(sin));
334 sin.sin_family = AF_INET;
335 sin.sin_addr.s_addr = addr;
336
337
338 ret = rdma_bind_addr(cm_id, (struct sockaddr *)&sin);
339
340
341 if (ret || cm_id->device->node_type != RDMA_NODE_IB_CA)
342 ret = -EADDRNOTAVAIL;
343
344 rdsdebug("addr %pI4 ret %d node type %d\n",
345 &addr, ret,
346 cm_id->device ? cm_id->device->node_type : -1);
347
348 rdma_destroy_id(cm_id);
349
350 return ret;
351}
352
353static void rds_ib_unregister_client(void)
354{
355 ib_unregister_client(&rds_ib_client);
356
357 flush_workqueue(rds_wq);
358}
359
360void rds_ib_exit(void)
361{
362 rds_info_deregister_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info);
363 rds_ib_unregister_client();
364 rds_ib_destroy_nodev_conns();
365 rds_ib_sysctl_exit();
366 rds_ib_recv_exit();
367 rds_trans_unregister(&rds_ib_transport);
368}
369
370struct rds_transport rds_ib_transport = {
371 .laddr_check = rds_ib_laddr_check,
372 .xmit_complete = rds_ib_xmit_complete,
373 .xmit = rds_ib_xmit,
374 .xmit_rdma = rds_ib_xmit_rdma,
375 .xmit_atomic = rds_ib_xmit_atomic,
376 .recv = rds_ib_recv,
377 .conn_alloc = rds_ib_conn_alloc,
378 .conn_free = rds_ib_conn_free,
379 .conn_connect = rds_ib_conn_connect,
380 .conn_shutdown = rds_ib_conn_shutdown,
381 .inc_copy_to_user = rds_ib_inc_copy_to_user,
382 .inc_free = rds_ib_inc_free,
383 .cm_initiate_connect = rds_ib_cm_initiate_connect,
384 .cm_handle_connect = rds_ib_cm_handle_connect,
385 .cm_connect_complete = rds_ib_cm_connect_complete,
386 .stats_info_copy = rds_ib_stats_info_copy,
387 .exit = rds_ib_exit,
388 .get_mr = rds_ib_get_mr,
389 .sync_mr = rds_ib_sync_mr,
390 .free_mr = rds_ib_free_mr,
391 .flush_mrs = rds_ib_flush_mrs,
392 .t_owner = THIS_MODULE,
393 .t_name = "infiniband",
394 .t_type = RDS_TRANS_IB
395};
396
397int rds_ib_init(void)
398{
399 int ret;
400
401 INIT_LIST_HEAD(&rds_ib_devices);
402
403 ret = ib_register_client(&rds_ib_client);
404 if (ret)
405 goto out;
406
407 ret = rds_ib_sysctl_init();
408 if (ret)
409 goto out_ibreg;
410
411 ret = rds_ib_recv_init();
412 if (ret)
413 goto out_sysctl;
414
415 ret = rds_trans_register(&rds_ib_transport);
416 if (ret)
417 goto out_recv;
418
419 rds_info_register_func(RDS_INFO_IB_CONNECTIONS, rds_ib_ic_info);
420
421 goto out;
422
423out_recv:
424 rds_ib_recv_exit();
425out_sysctl:
426 rds_ib_sysctl_exit();
427out_ibreg:
428 rds_ib_unregister_client();
429out:
430 return ret;
431}
432
433MODULE_LICENSE("GPL");
434
435