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9#undef pr_fmt
10#define pr_fmt(fmt) KBUILD_MODNAME " L" __stringify(__LINE__) ": " fmt
11
12#include <linux/module.h>
13#include <linux/inet.h>
14
15#include "rtrs-pri.h"
16#include "rtrs-log.h"
17
18MODULE_DESCRIPTION("RDMA Transport Core");
19MODULE_LICENSE("GPL");
20
21struct rtrs_iu *rtrs_iu_alloc(u32 iu_num, size_t size, gfp_t gfp_mask,
22 struct ib_device *dma_dev,
23 enum dma_data_direction dir,
24 void (*done)(struct ib_cq *cq, struct ib_wc *wc))
25{
26 struct rtrs_iu *ius, *iu;
27 int i;
28
29 ius = kcalloc(iu_num, sizeof(*ius), gfp_mask);
30 if (!ius)
31 return NULL;
32 for (i = 0; i < iu_num; i++) {
33 iu = &ius[i];
34 iu->direction = dir;
35 iu->buf = kzalloc(size, gfp_mask);
36 if (!iu->buf)
37 goto err;
38
39 iu->dma_addr = ib_dma_map_single(dma_dev, iu->buf, size, dir);
40 if (ib_dma_mapping_error(dma_dev, iu->dma_addr))
41 goto err;
42
43 iu->cqe.done = done;
44 iu->size = size;
45 }
46 return ius;
47err:
48 rtrs_iu_free(ius, dma_dev, i);
49 return NULL;
50}
51EXPORT_SYMBOL_GPL(rtrs_iu_alloc);
52
53void rtrs_iu_free(struct rtrs_iu *ius, struct ib_device *ibdev, u32 queue_num)
54{
55 struct rtrs_iu *iu;
56 int i;
57
58 if (!ius)
59 return;
60
61 for (i = 0; i < queue_num; i++) {
62 iu = &ius[i];
63 ib_dma_unmap_single(ibdev, iu->dma_addr, iu->size, iu->direction);
64 kfree(iu->buf);
65 }
66 kfree(ius);
67}
68EXPORT_SYMBOL_GPL(rtrs_iu_free);
69
70int rtrs_iu_post_recv(struct rtrs_con *con, struct rtrs_iu *iu)
71{
72 struct rtrs_sess *sess = con->sess;
73 struct ib_recv_wr wr;
74 struct ib_sge list;
75
76 list.addr = iu->dma_addr;
77 list.length = iu->size;
78 list.lkey = sess->dev->ib_pd->local_dma_lkey;
79
80 if (list.length == 0) {
81 rtrs_wrn(con->sess,
82 "Posting receive work request failed, sg list is empty\n");
83 return -EINVAL;
84 }
85 wr = (struct ib_recv_wr) {
86 .wr_cqe = &iu->cqe,
87 .sg_list = &list,
88 .num_sge = 1,
89 };
90
91 return ib_post_recv(con->qp, &wr, NULL);
92}
93EXPORT_SYMBOL_GPL(rtrs_iu_post_recv);
94
95int rtrs_post_recv_empty(struct rtrs_con *con, struct ib_cqe *cqe)
96{
97 struct ib_recv_wr wr;
98
99 wr = (struct ib_recv_wr) {
100 .wr_cqe = cqe,
101 };
102
103 return ib_post_recv(con->qp, &wr, NULL);
104}
105EXPORT_SYMBOL_GPL(rtrs_post_recv_empty);
106
107static int rtrs_post_send(struct ib_qp *qp, struct ib_send_wr *head,
108 struct ib_send_wr *wr, struct ib_send_wr *tail)
109{
110 if (head) {
111 struct ib_send_wr *next = head;
112
113 while (next->next)
114 next = next->next;
115 next->next = wr;
116 } else {
117 head = wr;
118 }
119
120 if (tail)
121 wr->next = tail;
122
123 return ib_post_send(qp, head, NULL);
124}
125
126int rtrs_iu_post_send(struct rtrs_con *con, struct rtrs_iu *iu, size_t size,
127 struct ib_send_wr *head)
128{
129 struct rtrs_sess *sess = con->sess;
130 struct ib_send_wr wr;
131 struct ib_sge list;
132
133 if (WARN_ON(size == 0))
134 return -EINVAL;
135
136 list.addr = iu->dma_addr;
137 list.length = size;
138 list.lkey = sess->dev->ib_pd->local_dma_lkey;
139
140 wr = (struct ib_send_wr) {
141 .wr_cqe = &iu->cqe,
142 .sg_list = &list,
143 .num_sge = 1,
144 .opcode = IB_WR_SEND,
145 .send_flags = IB_SEND_SIGNALED,
146 };
147
148 return rtrs_post_send(con->qp, head, &wr, NULL);
149}
150EXPORT_SYMBOL_GPL(rtrs_iu_post_send);
151
152int rtrs_iu_post_rdma_write_imm(struct rtrs_con *con, struct rtrs_iu *iu,
153 struct ib_sge *sge, unsigned int num_sge,
154 u32 rkey, u64 rdma_addr, u32 imm_data,
155 enum ib_send_flags flags,
156 struct ib_send_wr *head,
157 struct ib_send_wr *tail)
158{
159 struct ib_rdma_wr wr;
160 int i;
161
162 wr = (struct ib_rdma_wr) {
163 .wr.wr_cqe = &iu->cqe,
164 .wr.sg_list = sge,
165 .wr.num_sge = num_sge,
166 .rkey = rkey,
167 .remote_addr = rdma_addr,
168 .wr.opcode = IB_WR_RDMA_WRITE_WITH_IMM,
169 .wr.ex.imm_data = cpu_to_be32(imm_data),
170 .wr.send_flags = flags,
171 };
172
173
174
175
176
177 for (i = 0; i < num_sge; i++)
178 if (WARN_ON(sge[i].length == 0))
179 return -EINVAL;
180
181 return rtrs_post_send(con->qp, head, &wr.wr, tail);
182}
183EXPORT_SYMBOL_GPL(rtrs_iu_post_rdma_write_imm);
184
185int rtrs_post_rdma_write_imm_empty(struct rtrs_con *con, struct ib_cqe *cqe,
186 u32 imm_data, enum ib_send_flags flags,
187 struct ib_send_wr *head)
188{
189 struct ib_rdma_wr wr;
190
191 wr = (struct ib_rdma_wr) {
192 .wr.wr_cqe = cqe,
193 .wr.send_flags = flags,
194 .wr.opcode = IB_WR_RDMA_WRITE_WITH_IMM,
195 .wr.ex.imm_data = cpu_to_be32(imm_data),
196 };
197
198 return rtrs_post_send(con->qp, head, &wr.wr, NULL);
199}
200EXPORT_SYMBOL_GPL(rtrs_post_rdma_write_imm_empty);
201
202static void qp_event_handler(struct ib_event *ev, void *ctx)
203{
204 struct rtrs_con *con = ctx;
205
206 switch (ev->event) {
207 case IB_EVENT_COMM_EST:
208 rtrs_info(con->sess, "QP event %s (%d) received\n",
209 ib_event_msg(ev->event), ev->event);
210 rdma_notify(con->cm_id, IB_EVENT_COMM_EST);
211 break;
212 default:
213 rtrs_info(con->sess, "Unhandled QP event %s (%d) received\n",
214 ib_event_msg(ev->event), ev->event);
215 break;
216 }
217}
218
219static int create_cq(struct rtrs_con *con, int cq_vector, int nr_cqe,
220 enum ib_poll_context poll_ctx)
221{
222 struct rdma_cm_id *cm_id = con->cm_id;
223 struct ib_cq *cq;
224
225 cq = ib_cq_pool_get(cm_id->device, nr_cqe, cq_vector, poll_ctx);
226 if (IS_ERR(cq)) {
227 rtrs_err(con->sess, "Creating completion queue failed, errno: %ld\n",
228 PTR_ERR(cq));
229 return PTR_ERR(cq);
230 }
231 con->cq = cq;
232 con->nr_cqe = nr_cqe;
233
234 return 0;
235}
236
237static int create_qp(struct rtrs_con *con, struct ib_pd *pd,
238 u32 max_send_wr, u32 max_recv_wr, u32 max_sge)
239{
240 struct ib_qp_init_attr init_attr = {NULL};
241 struct rdma_cm_id *cm_id = con->cm_id;
242 int ret;
243
244 init_attr.cap.max_send_wr = max_send_wr;
245 init_attr.cap.max_recv_wr = max_recv_wr;
246 init_attr.cap.max_recv_sge = 1;
247 init_attr.event_handler = qp_event_handler;
248 init_attr.qp_context = con;
249 init_attr.cap.max_send_sge = max_sge;
250
251 init_attr.qp_type = IB_QPT_RC;
252 init_attr.send_cq = con->cq;
253 init_attr.recv_cq = con->cq;
254 init_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
255
256 ret = rdma_create_qp(cm_id, pd, &init_attr);
257 if (ret) {
258 rtrs_err(con->sess, "Creating QP failed, err: %d\n", ret);
259 return ret;
260 }
261 con->qp = cm_id->qp;
262
263 return ret;
264}
265
266int rtrs_cq_qp_create(struct rtrs_sess *sess, struct rtrs_con *con,
267 u32 max_send_sge, int cq_vector, int nr_cqe,
268 u32 max_send_wr, u32 max_recv_wr,
269 enum ib_poll_context poll_ctx)
270{
271 int err;
272
273 err = create_cq(con, cq_vector, nr_cqe, poll_ctx);
274 if (err)
275 return err;
276
277 err = create_qp(con, sess->dev->ib_pd, max_send_wr, max_recv_wr,
278 max_send_sge);
279 if (err) {
280 ib_cq_pool_put(con->cq, con->nr_cqe);
281 con->cq = NULL;
282 return err;
283 }
284 con->sess = sess;
285
286 return 0;
287}
288EXPORT_SYMBOL_GPL(rtrs_cq_qp_create);
289
290void rtrs_cq_qp_destroy(struct rtrs_con *con)
291{
292 if (con->qp) {
293 rdma_destroy_qp(con->cm_id);
294 con->qp = NULL;
295 }
296 if (con->cq) {
297 ib_cq_pool_put(con->cq, con->nr_cqe);
298 con->cq = NULL;
299 }
300}
301EXPORT_SYMBOL_GPL(rtrs_cq_qp_destroy);
302
303static void schedule_hb(struct rtrs_sess *sess)
304{
305 queue_delayed_work(sess->hb_wq, &sess->hb_dwork,
306 msecs_to_jiffies(sess->hb_interval_ms));
307}
308
309void rtrs_send_hb_ack(struct rtrs_sess *sess)
310{
311 struct rtrs_con *usr_con = sess->con[0];
312 u32 imm;
313 int err;
314
315 imm = rtrs_to_imm(RTRS_HB_ACK_IMM, 0);
316 err = rtrs_post_rdma_write_imm_empty(usr_con, sess->hb_cqe, imm,
317 0, NULL);
318 if (err) {
319 sess->hb_err_handler(usr_con);
320 return;
321 }
322}
323EXPORT_SYMBOL_GPL(rtrs_send_hb_ack);
324
325static void hb_work(struct work_struct *work)
326{
327 struct rtrs_con *usr_con;
328 struct rtrs_sess *sess;
329 u32 imm;
330 int err;
331
332 sess = container_of(to_delayed_work(work), typeof(*sess), hb_dwork);
333 usr_con = sess->con[0];
334
335 if (sess->hb_missed_cnt > sess->hb_missed_max) {
336 sess->hb_err_handler(usr_con);
337 return;
338 }
339 if (sess->hb_missed_cnt++) {
340
341 schedule_hb(sess);
342 return;
343 }
344
345 sess->hb_last_sent = ktime_get();
346
347 imm = rtrs_to_imm(RTRS_HB_MSG_IMM, 0);
348 err = rtrs_post_rdma_write_imm_empty(usr_con, sess->hb_cqe, imm,
349 0, NULL);
350 if (err) {
351 sess->hb_err_handler(usr_con);
352 return;
353 }
354
355 schedule_hb(sess);
356}
357
358void rtrs_init_hb(struct rtrs_sess *sess, struct ib_cqe *cqe,
359 unsigned int interval_ms, unsigned int missed_max,
360 void (*err_handler)(struct rtrs_con *con),
361 struct workqueue_struct *wq)
362{
363 sess->hb_cqe = cqe;
364 sess->hb_interval_ms = interval_ms;
365 sess->hb_err_handler = err_handler;
366 sess->hb_wq = wq;
367 sess->hb_missed_max = missed_max;
368 sess->hb_missed_cnt = 0;
369 INIT_DELAYED_WORK(&sess->hb_dwork, hb_work);
370}
371EXPORT_SYMBOL_GPL(rtrs_init_hb);
372
373void rtrs_start_hb(struct rtrs_sess *sess)
374{
375 schedule_hb(sess);
376}
377EXPORT_SYMBOL_GPL(rtrs_start_hb);
378
379void rtrs_stop_hb(struct rtrs_sess *sess)
380{
381 cancel_delayed_work_sync(&sess->hb_dwork);
382 sess->hb_missed_cnt = 0;
383}
384EXPORT_SYMBOL_GPL(rtrs_stop_hb);
385
386static int rtrs_str_gid_to_sockaddr(const char *addr, size_t len,
387 short port, struct sockaddr_storage *dst)
388{
389 struct sockaddr_ib *dst_ib = (struct sockaddr_ib *)dst;
390 int ret;
391
392
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394
395
396 ret = in6_pton(addr, len, dst_ib->sib_addr.sib_raw, '\0', NULL);
397 if (ret == 0)
398 return -EINVAL;
399
400 dst_ib->sib_family = AF_IB;
401
402
403
404
405 dst_ib->sib_sid = cpu_to_be64(RDMA_IB_IP_PS_IB | port);
406 dst_ib->sib_sid_mask = cpu_to_be64(0xffffffffffffffffULL);
407 dst_ib->sib_pkey = cpu_to_be16(0xffff);
408
409 return 0;
410}
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423
424static int rtrs_str_to_sockaddr(const char *addr, size_t len,
425 u16 port, struct sockaddr_storage *dst)
426{
427 if (strncmp(addr, "gid:", 4) == 0) {
428 return rtrs_str_gid_to_sockaddr(addr + 4, len - 4, port, dst);
429 } else if (strncmp(addr, "ip:", 3) == 0) {
430 char port_str[8];
431 char *cpy;
432 int err;
433
434 snprintf(port_str, sizeof(port_str), "%u", port);
435 cpy = kstrndup(addr + 3, len - 3, GFP_KERNEL);
436 err = cpy ? inet_pton_with_scope(&init_net, AF_UNSPEC,
437 cpy, port_str, dst) : -ENOMEM;
438 kfree(cpy);
439
440 return err;
441 }
442 return -EPROTONOSUPPORT;
443}
444
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453
454int sockaddr_to_str(const struct sockaddr *addr, char *buf, size_t len)
455{
456
457 switch (addr->sa_family) {
458 case AF_IB:
459 return scnprintf(buf, len, "gid:%pI6",
460 &((struct sockaddr_ib *)addr)->sib_addr.sib_raw);
461 case AF_INET:
462 return scnprintf(buf, len, "ip:%pI4",
463 &((struct sockaddr_in *)addr)->sin_addr);
464 case AF_INET6:
465 return scnprintf(buf, len, "ip:%pI6c",
466 &((struct sockaddr_in6 *)addr)->sin6_addr);
467 }
468 return scnprintf(buf, len, "<invalid address family>");
469}
470EXPORT_SYMBOL(sockaddr_to_str);
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482
483int rtrs_addr_to_str(const struct rtrs_addr *addr, char *buf, size_t len)
484{
485 int cnt;
486
487 cnt = sockaddr_to_str((struct sockaddr *)addr->src,
488 buf, len);
489 cnt += scnprintf(buf + cnt, len - cnt, "@");
490 sockaddr_to_str((struct sockaddr *)addr->dst,
491 buf + cnt, len - cnt);
492 return cnt;
493}
494EXPORT_SYMBOL(rtrs_addr_to_str);
495
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509
510int rtrs_addr_to_sockaddr(const char *str, size_t len, u16 port,
511 struct rtrs_addr *addr)
512{
513 const char *d;
514
515 d = strchr(str, ',');
516 if (!d)
517 d = strchr(str, '@');
518 if (d) {
519 if (rtrs_str_to_sockaddr(str, d - str, 0, addr->src))
520 return -EINVAL;
521 d += 1;
522 len -= d - str;
523 str = d;
524
525 } else {
526 addr->src = NULL;
527 }
528 return rtrs_str_to_sockaddr(str, len, port, addr->dst);
529}
530EXPORT_SYMBOL(rtrs_addr_to_sockaddr);
531
532void rtrs_rdma_dev_pd_init(enum ib_pd_flags pd_flags,
533 struct rtrs_rdma_dev_pd *pool)
534{
535 WARN_ON(pool->ops && (!pool->ops->alloc ^ !pool->ops->free));
536 INIT_LIST_HEAD(&pool->list);
537 mutex_init(&pool->mutex);
538 pool->pd_flags = pd_flags;
539}
540EXPORT_SYMBOL(rtrs_rdma_dev_pd_init);
541
542void rtrs_rdma_dev_pd_deinit(struct rtrs_rdma_dev_pd *pool)
543{
544 mutex_destroy(&pool->mutex);
545 WARN_ON(!list_empty(&pool->list));
546}
547EXPORT_SYMBOL(rtrs_rdma_dev_pd_deinit);
548
549static void dev_free(struct kref *ref)
550{
551 struct rtrs_rdma_dev_pd *pool;
552 struct rtrs_ib_dev *dev;
553
554 dev = container_of(ref, typeof(*dev), ref);
555 pool = dev->pool;
556
557 mutex_lock(&pool->mutex);
558 list_del(&dev->entry);
559 mutex_unlock(&pool->mutex);
560
561 if (pool->ops && pool->ops->deinit)
562 pool->ops->deinit(dev);
563
564 ib_dealloc_pd(dev->ib_pd);
565
566 if (pool->ops && pool->ops->free)
567 pool->ops->free(dev);
568 else
569 kfree(dev);
570}
571
572int rtrs_ib_dev_put(struct rtrs_ib_dev *dev)
573{
574 return kref_put(&dev->ref, dev_free);
575}
576EXPORT_SYMBOL(rtrs_ib_dev_put);
577
578static int rtrs_ib_dev_get(struct rtrs_ib_dev *dev)
579{
580 return kref_get_unless_zero(&dev->ref);
581}
582
583struct rtrs_ib_dev *
584rtrs_ib_dev_find_or_add(struct ib_device *ib_dev,
585 struct rtrs_rdma_dev_pd *pool)
586{
587 struct rtrs_ib_dev *dev;
588
589 mutex_lock(&pool->mutex);
590 list_for_each_entry(dev, &pool->list, entry) {
591 if (dev->ib_dev->node_guid == ib_dev->node_guid &&
592 rtrs_ib_dev_get(dev))
593 goto out_unlock;
594 }
595 mutex_unlock(&pool->mutex);
596 if (pool->ops && pool->ops->alloc)
597 dev = pool->ops->alloc();
598 else
599 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
600 if (IS_ERR_OR_NULL(dev))
601 goto out_err;
602
603 kref_init(&dev->ref);
604 dev->pool = pool;
605 dev->ib_dev = ib_dev;
606 dev->ib_pd = ib_alloc_pd(ib_dev, pool->pd_flags);
607 if (IS_ERR(dev->ib_pd))
608 goto out_free_dev;
609
610 if (pool->ops && pool->ops->init && pool->ops->init(dev))
611 goto out_free_pd;
612
613 mutex_lock(&pool->mutex);
614 list_add(&dev->entry, &pool->list);
615out_unlock:
616 mutex_unlock(&pool->mutex);
617 return dev;
618
619out_free_pd:
620 ib_dealloc_pd(dev->ib_pd);
621out_free_dev:
622 if (pool->ops && pool->ops->free)
623 pool->ops->free(dev);
624 else
625 kfree(dev);
626out_err:
627 return NULL;
628}
629EXPORT_SYMBOL(rtrs_ib_dev_find_or_add);
630