summaryrefslogtreecommitdiff
path: root/drivers/infiniband/ulp/rtrs/rtrs.c
blob: 3696f367ff5151333234c707ccad326385fdd59c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * RDMA Transport Layer
 *
 * Copyright (c) 2014 - 2018 ProfitBricks GmbH. All rights reserved.
 * Copyright (c) 2018 - 2019 1&1 IONOS Cloud GmbH. All rights reserved.
 * Copyright (c) 2019 - 2020 1&1 IONOS SE. All rights reserved.
 */
#undef pr_fmt
#define pr_fmt(fmt) KBUILD_MODNAME " L" __stringify(__LINE__) ": " fmt

#include <linux/module.h>
#include <linux/inet.h>

#include "rtrs-pri.h"
#include "rtrs-log.h"

MODULE_DESCRIPTION("RDMA Transport Core");
MODULE_LICENSE("GPL");

struct rtrs_iu *rtrs_iu_alloc(u32 iu_num, size_t size, gfp_t gfp_mask,
			      struct ib_device *dma_dev,
			      enum dma_data_direction dir,
			      void (*done)(struct ib_cq *cq, struct ib_wc *wc))
{
	struct rtrs_iu *ius, *iu;
	int i;

	ius = kcalloc(iu_num, sizeof(*ius), gfp_mask);
	if (!ius)
		return NULL;
	for (i = 0; i < iu_num; i++) {
		iu = &ius[i];
		iu->direction = dir;
		iu->buf = kzalloc(size, gfp_mask);
		if (!iu->buf)
			goto err;

		iu->dma_addr = ib_dma_map_single(dma_dev, iu->buf, size, dir);
		if (ib_dma_mapping_error(dma_dev, iu->dma_addr)) {
			kfree(iu->buf);
			goto err;
		}

		iu->cqe.done  = done;
		iu->size      = size;
	}
	return ius;
err:
	rtrs_iu_free(ius, dma_dev, i);
	return NULL;
}
EXPORT_SYMBOL_GPL(rtrs_iu_alloc);

void rtrs_iu_free(struct rtrs_iu *ius, struct ib_device *ibdev, u32 queue_num)
{
	struct rtrs_iu *iu;
	int i;

	if (!ius)
		return;

	for (i = 0; i < queue_num; i++) {
		iu = &ius[i];
		ib_dma_unmap_single(ibdev, iu->dma_addr, iu->size, iu->direction);
		kfree(iu->buf);
	}
	kfree(ius);
}
EXPORT_SYMBOL_GPL(rtrs_iu_free);

int rtrs_iu_post_recv(struct rtrs_con *con, struct rtrs_iu *iu)
{
	struct rtrs_path *path = con->path;
	struct ib_recv_wr wr;
	struct ib_sge list;

	list.addr   = iu->dma_addr;
	list.length = iu->size;
	list.lkey   = path->dev->ib_pd->local_dma_lkey;

	if (list.length == 0) {
		rtrs_wrn(con->path,
			  "Posting receive work request failed, sg list is empty\n");
		return -EINVAL;
	}
	wr = (struct ib_recv_wr) {
		.wr_cqe  = &iu->cqe,
		.sg_list = &list,
		.num_sge = 1,
	};

	return ib_post_recv(con->qp, &wr, NULL);
}
EXPORT_SYMBOL_GPL(rtrs_iu_post_recv);

int rtrs_post_recv_empty(struct rtrs_con *con, struct ib_cqe *cqe)
{
	struct ib_recv_wr wr;

	wr = (struct ib_recv_wr) {
		.wr_cqe  = cqe,
	};

	return ib_post_recv(con->qp, &wr, NULL);
}
EXPORT_SYMBOL_GPL(rtrs_post_recv_empty);

static int rtrs_post_send(struct ib_qp *qp, struct ib_send_wr *head,
			  struct ib_send_wr *wr, struct ib_send_wr *tail)
{
	if (head) {
		struct ib_send_wr *next = head;

		while (next->next)
			next = next->next;
		next->next = wr;
	} else {
		head = wr;
	}

	if (tail)
		wr->next = tail;

	return ib_post_send(qp, head, NULL);
}

int rtrs_iu_post_send(struct rtrs_con *con, struct rtrs_iu *iu, size_t size,
		       struct ib_send_wr *head)
{
	struct rtrs_path *path = con->path;
	struct ib_send_wr wr;
	struct ib_sge list;

	if (WARN_ON(size == 0))
		return -EINVAL;

	list.addr   = iu->dma_addr;
	list.length = size;
	list.lkey   = path->dev->ib_pd->local_dma_lkey;

	wr = (struct ib_send_wr) {
		.wr_cqe     = &iu->cqe,
		.sg_list    = &list,
		.num_sge    = 1,
		.opcode     = IB_WR_SEND,
		.send_flags = IB_SEND_SIGNALED,
	};

	return rtrs_post_send(con->qp, head, &wr, NULL);
}
EXPORT_SYMBOL_GPL(rtrs_iu_post_send);

int rtrs_iu_post_rdma_write_imm(struct rtrs_con *con, struct rtrs_iu *iu,
				struct ib_sge *sge, unsigned int num_sge,
				u32 rkey, u64 rdma_addr, u32 imm_data,
				enum ib_send_flags flags,
				struct ib_send_wr *head,
				struct ib_send_wr *tail)
{
	struct ib_rdma_wr wr;
	int i;

	wr = (struct ib_rdma_wr) {
		.wr.wr_cqe	  = &iu->cqe,
		.wr.sg_list	  = sge,
		.wr.num_sge	  = num_sge,
		.rkey		  = rkey,
		.remote_addr	  = rdma_addr,
		.wr.opcode	  = IB_WR_RDMA_WRITE_WITH_IMM,
		.wr.ex.imm_data = cpu_to_be32(imm_data),
		.wr.send_flags  = flags,
	};

	/*
	 * If one of the sges has 0 size, the operation will fail with a
	 * length error
	 */
	for (i = 0; i < num_sge; i++)
		if (WARN_ONCE(sge[i].length == 0, "sg %d is zero length\n", i))
			return -EINVAL;

	return rtrs_post_send(con->qp, head, &wr.wr, tail);
}
EXPORT_SYMBOL_GPL(rtrs_iu_post_rdma_write_imm);

static int rtrs_post_rdma_write_imm_empty(struct rtrs_con *con,
					  struct ib_cqe *cqe,
					  u32 imm_data,
					  struct ib_send_wr *head)
{
	struct ib_rdma_wr wr;
	struct rtrs_path *path = con->path;
	enum ib_send_flags sflags;

	atomic_dec_if_positive(&con->sq_wr_avail);
	sflags = (atomic_inc_return(&con->wr_cnt) % path->signal_interval) ?
		0 : IB_SEND_SIGNALED;

	wr = (struct ib_rdma_wr) {
		.wr.wr_cqe	= cqe,
		.wr.send_flags	= sflags,
		.wr.opcode	= IB_WR_RDMA_WRITE_WITH_IMM,
		.wr.ex.imm_data	= cpu_to_be32(imm_data),
	};

	return rtrs_post_send(con->qp, head, &wr.wr, NULL);
}

static void qp_event_handler(struct ib_event *ev, void *ctx)
{
	struct rtrs_con *con = ctx;

	switch (ev->event) {
	case IB_EVENT_COMM_EST:
		rtrs_info(con->path, "QP event %s (%d) received\n",
			   ib_event_msg(ev->event), ev->event);
		rdma_notify(con->cm_id, IB_EVENT_COMM_EST);
		break;
	default:
		rtrs_info(con->path, "Unhandled QP event %s (%d) received\n",
			   ib_event_msg(ev->event), ev->event);
		break;
	}
}

static bool is_pollqueue(struct rtrs_con *con)
{
	return con->cid >= con->path->irq_con_num;
}

static int create_cq(struct rtrs_con *con, int cq_vector, int nr_cqe,
		     enum ib_poll_context poll_ctx)
{
	struct rdma_cm_id *cm_id = con->cm_id;
	struct ib_cq *cq;

	if (is_pollqueue(con))
		cq = ib_alloc_cq(cm_id->device, con, nr_cqe, cq_vector,
				 poll_ctx);
	else
		cq = ib_cq_pool_get(cm_id->device, nr_cqe, cq_vector, poll_ctx);

	if (IS_ERR(cq)) {
		rtrs_err(con->path, "Creating completion queue failed, errno: %ld\n",
			  PTR_ERR(cq));
		return PTR_ERR(cq);
	}
	con->cq = cq;
	con->nr_cqe = nr_cqe;

	return 0;
}

static int create_qp(struct rtrs_con *con, struct ib_pd *pd,
		     u32 max_send_wr, u32 max_recv_wr, u32 max_sge)
{
	struct ib_qp_init_attr init_attr = {NULL};
	struct rdma_cm_id *cm_id = con->cm_id;
	int ret;

	init_attr.cap.max_send_wr = max_send_wr;
	init_attr.cap.max_recv_wr = max_recv_wr;
	init_attr.cap.max_recv_sge = 1;
	init_attr.event_handler = qp_event_handler;
	init_attr.qp_context = con;
	init_attr.cap.max_send_sge = max_sge;

	init_attr.qp_type = IB_QPT_RC;
	init_attr.send_cq = con->cq;
	init_attr.recv_cq = con->cq;
	init_attr.sq_sig_type = IB_SIGNAL_REQ_WR;

	ret = rdma_create_qp(cm_id, pd, &init_attr);
	if (ret) {
		rtrs_err(con->path, "Creating QP failed, err: %d\n", ret);
		return ret;
	}
	con->qp = cm_id->qp;

	return ret;
}

static void destroy_cq(struct rtrs_con *con)
{
	if (con->cq) {
		if (is_pollqueue(con))
			ib_free_cq(con->cq);
		else
			ib_cq_pool_put(con->cq, con->nr_cqe);
	}
	con->cq = NULL;
}

int rtrs_cq_qp_create(struct rtrs_path *path, struct rtrs_con *con,
		       u32 max_send_sge, int cq_vector, int nr_cqe,
		       u32 max_send_wr, u32 max_recv_wr,
		       enum ib_poll_context poll_ctx)
{
	int err;

	err = create_cq(con, cq_vector, nr_cqe, poll_ctx);
	if (err)
		return err;

	err = create_qp(con, path->dev->ib_pd, max_send_wr, max_recv_wr,
			max_send_sge);
	if (err) {
		destroy_cq(con);
		return err;
	}
	con->path = path;

	return 0;
}
EXPORT_SYMBOL_GPL(rtrs_cq_qp_create);

void rtrs_cq_qp_destroy(struct rtrs_con *con)
{
	if (con->qp) {
		rdma_destroy_qp(con->cm_id);
		con->qp = NULL;
	}
	destroy_cq(con);
}
EXPORT_SYMBOL_GPL(rtrs_cq_qp_destroy);

static void schedule_hb(struct rtrs_path *path)
{
	queue_delayed_work(path->hb_wq, &path->hb_dwork,
			   msecs_to_jiffies(path->hb_interval_ms));
}

void rtrs_send_hb_ack(struct rtrs_path *path)
{
	struct rtrs_con *usr_con = path->con[0];
	u32 imm;
	int err;

	imm = rtrs_to_imm(RTRS_HB_ACK_IMM, 0);
	err = rtrs_post_rdma_write_imm_empty(usr_con, path->hb_cqe, imm,
					     NULL);
	if (err) {
		rtrs_err(path, "send HB ACK failed, errno: %d\n", err);
		path->hb_err_handler(usr_con);
		return;
	}
}
EXPORT_SYMBOL_GPL(rtrs_send_hb_ack);

static void hb_work(struct work_struct *work)
{
	struct rtrs_con *usr_con;
	struct rtrs_path *path;
	u32 imm;
	int err;

	path = container_of(to_delayed_work(work), typeof(*path), hb_dwork);
	usr_con = path->con[0];

	if (path->hb_missed_cnt > path->hb_missed_max) {
		rtrs_err(path, "HB missed max reached.\n");
		path->hb_err_handler(usr_con);
		return;
	}
	if (path->hb_missed_cnt++) {
		/* Reschedule work without sending hb */
		schedule_hb(path);
		return;
	}

	path->hb_last_sent = ktime_get();

	imm = rtrs_to_imm(RTRS_HB_MSG_IMM, 0);
	err = rtrs_post_rdma_write_imm_empty(usr_con, path->hb_cqe, imm,
					     NULL);
	if (err) {
		rtrs_err(path, "HB send failed, errno: %d\n", err);
		path->hb_err_handler(usr_con);
		return;
	}

	schedule_hb(path);
}

void rtrs_init_hb(struct rtrs_path *path, struct ib_cqe *cqe,
		  unsigned int interval_ms, unsigned int missed_max,
		  void (*err_handler)(struct rtrs_con *con),
		  struct workqueue_struct *wq)
{
	path->hb_cqe = cqe;
	path->hb_interval_ms = interval_ms;
	path->hb_err_handler = err_handler;
	path->hb_wq = wq;
	path->hb_missed_max = missed_max;
	path->hb_missed_cnt = 0;
	INIT_DELAYED_WORK(&path->hb_dwork, hb_work);
}
EXPORT_SYMBOL_GPL(rtrs_init_hb);

void rtrs_start_hb(struct rtrs_path *path)
{
	schedule_hb(path);
}
EXPORT_SYMBOL_GPL(rtrs_start_hb);

void rtrs_stop_hb(struct rtrs_path *path)
{
	cancel_delayed_work_sync(&path->hb_dwork);
	path->hb_missed_cnt = 0;
}
EXPORT_SYMBOL_GPL(rtrs_stop_hb);

static int rtrs_str_gid_to_sockaddr(const char *addr, size_t len,
				     short port, struct sockaddr_storage *dst)
{
	struct sockaddr_ib *dst_ib = (struct sockaddr_ib *)dst;
	int ret;

	/*
	 * We can use some of the IPv6 functions since GID is a valid
	 * IPv6 address format
	 */
	ret = in6_pton(addr, len, dst_ib->sib_addr.sib_raw, '\0', NULL);
	if (ret == 0)
		return -EINVAL;

	dst_ib->sib_family = AF_IB;
	/*
	 * Use the same TCP server port number as the IB service ID
	 * on the IB port space range
	 */
	dst_ib->sib_sid = cpu_to_be64(RDMA_IB_IP_PS_IB | port);
	dst_ib->sib_sid_mask = cpu_to_be64(0xffffffffffffffffULL);
	dst_ib->sib_pkey = cpu_to_be16(0xffff);

	return 0;
}

/**
 * rtrs_str_to_sockaddr() - Convert rtrs address string to sockaddr
 * @addr:	String representation of an addr (IPv4, IPv6 or IB GID):
 *              - "ip:192.168.1.1"
 *              - "ip:fe80::200:5aee:feaa:20a2"
 *              - "gid:fe80::200:5aee:feaa:20a2"
 * @len:        String address length
 * @port:	Destination port
 * @dst:	Destination sockaddr structure
 *
 * Returns 0 if conversion successful. Non-zero on error.
 */
static int rtrs_str_to_sockaddr(const char *addr, size_t len,
				u16 port, struct sockaddr_storage *dst)
{
	if (strncmp(addr, "gid:", 4) == 0) {
		return rtrs_str_gid_to_sockaddr(addr + 4, len - 4, port, dst);
	} else if (strncmp(addr, "ip:", 3) == 0) {
		char port_str[8];
		char *cpy;
		int err;

		snprintf(port_str, sizeof(port_str), "%u", port);
		cpy = kstrndup(addr + 3, len - 3, GFP_KERNEL);
		err = cpy ? inet_pton_with_scope(&init_net, AF_UNSPEC,
						 cpy, port_str, dst) : -ENOMEM;
		kfree(cpy);

		return err;
	}
	return -EPROTONOSUPPORT;
}

/**
 * sockaddr_to_str() - convert sockaddr to a string.
 * @addr:	the sockadddr structure to be converted.
 * @buf:	string containing socket addr.
 * @len:	string length.
 *
 * The return value is the number of characters written into buf not
 * including the trailing '\0'. If len is == 0 the function returns 0..
 */
int sockaddr_to_str(const struct sockaddr *addr, char *buf, size_t len)
{
	switch (addr->sa_family) {
	case AF_IB:
		return scnprintf(buf, len, "gid:%pI6",
			&((struct sockaddr_ib *)addr)->sib_addr.sib_raw);
	case AF_INET:
		return scnprintf(buf, len, "ip:%pI4",
			&((struct sockaddr_in *)addr)->sin_addr);
	case AF_INET6:
		return scnprintf(buf, len, "ip:%pI6c",
			  &((struct sockaddr_in6 *)addr)->sin6_addr);
	}
	return scnprintf(buf, len, "<invalid address family>");
}
EXPORT_SYMBOL(sockaddr_to_str);

/**
 * rtrs_addr_to_str() - convert rtrs_addr to a string "src@dst"
 * @addr:	the rtrs_addr structure to be converted
 * @buf:	string containing source and destination addr of a path
 *		separated by '@' I.e. "ip:1.1.1.1@ip:1.1.1.2"
 *		"ip:1.1.1.1@ip:1.1.1.2".
 * @len:	string length
 *
 * The return value is the number of characters written into buf not
 * including the trailing '\0'.
 */
int rtrs_addr_to_str(const struct rtrs_addr *addr, char *buf, size_t len)
{
	int cnt;

	cnt = sockaddr_to_str((struct sockaddr *)addr->src,
			      buf, len);
	cnt += scnprintf(buf + cnt, len - cnt, "@");
	sockaddr_to_str((struct sockaddr *)addr->dst,
			buf + cnt, len - cnt);
	return cnt;
}
EXPORT_SYMBOL(rtrs_addr_to_str);

/**
 * rtrs_addr_to_sockaddr() - convert path string "src,dst" or "src@dst"
 * to sockaddreses
 * @str:	string containing source and destination addr of a path
 *		separated by ',' or '@' I.e. "ip:1.1.1.1,ip:1.1.1.2" or
 *		"ip:1.1.1.1@ip:1.1.1.2". If str contains only one address it's
 *		considered to be destination.
 * @len:	string length
 * @port:	Destination port number.
 * @addr:	will be set to the source/destination address or to NULL
 *		if str doesn't contain any source address.
 *
 * Returns zero if conversion successful. Non-zero otherwise.
 */
int rtrs_addr_to_sockaddr(const char *str, size_t len, u16 port,
			  struct rtrs_addr *addr)
{
	const char *d;

	d = strchr(str, ',');
	if (!d)
		d = strchr(str, '@');
	if (d) {
		if (rtrs_str_to_sockaddr(str, d - str, 0, addr->src))
			return -EINVAL;
		d += 1;
		len -= d - str;
		str  = d;

	} else {
		addr->src = NULL;
	}
	return rtrs_str_to_sockaddr(str, len, port, addr->dst);
}
EXPORT_SYMBOL(rtrs_addr_to_sockaddr);

void rtrs_rdma_dev_pd_init(enum ib_pd_flags pd_flags,
			    struct rtrs_rdma_dev_pd *pool)
{
	INIT_LIST_HEAD(&pool->list);
	mutex_init(&pool->mutex);
	pool->pd_flags = pd_flags;
}
EXPORT_SYMBOL(rtrs_rdma_dev_pd_init);

void rtrs_rdma_dev_pd_deinit(struct rtrs_rdma_dev_pd *pool)
{
	mutex_destroy(&pool->mutex);
	WARN_ON(!list_empty(&pool->list));
}
EXPORT_SYMBOL(rtrs_rdma_dev_pd_deinit);

static void dev_free(struct kref *ref)
{
	struct rtrs_rdma_dev_pd *pool;
	struct rtrs_ib_dev *dev;

	dev = container_of(ref, typeof(*dev), ref);
	pool = dev->pool;

	mutex_lock(&pool->mutex);
	list_del(&dev->entry);
	mutex_unlock(&pool->mutex);

	ib_dealloc_pd(dev->ib_pd);
	kfree(dev);
}

int rtrs_ib_dev_put(struct rtrs_ib_dev *dev)
{
	return kref_put(&dev->ref, dev_free);
}
EXPORT_SYMBOL(rtrs_ib_dev_put);

static int rtrs_ib_dev_get(struct rtrs_ib_dev *dev)
{
	return kref_get_unless_zero(&dev->ref);
}

struct rtrs_ib_dev *
rtrs_ib_dev_find_or_add(struct ib_device *ib_dev,
			 struct rtrs_rdma_dev_pd *pool)
{
	struct rtrs_ib_dev *dev;

	mutex_lock(&pool->mutex);
	list_for_each_entry(dev, &pool->list, entry) {
		if (dev->ib_dev->node_guid == ib_dev->node_guid &&
		    rtrs_ib_dev_get(dev))
			goto out_unlock;
	}
	mutex_unlock(&pool->mutex);
	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
	if (!dev)
		goto out_err;

	kref_init(&dev->ref);
	dev->pool = pool;
	dev->ib_dev = ib_dev;
	dev->ib_pd = ib_alloc_pd(ib_dev, pool->pd_flags);
	if (IS_ERR(dev->ib_pd))
		goto out_free_dev;

	if (pool->ops && pool->ops->init && pool->ops->init(dev))
		goto out_free_pd;

	mutex_lock(&pool->mutex);
	list_add(&dev->entry, &pool->list);
out_unlock:
	mutex_unlock(&pool->mutex);
	return dev;

out_free_pd:
	ib_dealloc_pd(dev->ib_pd);
out_free_dev:
	kfree(dev);
out_err:
	return NULL;
}
EXPORT_SYMBOL(rtrs_ib_dev_find_or_add);