summaryrefslogtreecommitdiffstats
path: root/drivers/infiniband/hw/qib/qib_qp.c
blob: 344e401915f7c92d69e9b06da70789fedcf00740 (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
/*
 * Copyright (c) 2012 - 2017 Intel Corporation.  All rights reserved.
 * Copyright (c) 2006 - 2012 QLogic Corporation.  * All rights reserved.
 * Copyright (c) 2005, 2006 PathScale, Inc. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <linux/err.h>
#include <linux/vmalloc.h>
#include <rdma/rdma_vt.h>
#ifdef CONFIG_DEBUG_FS
#include <linux/seq_file.h>
#endif

#include "qib.h"

static inline unsigned mk_qpn(struct rvt_qpn_table *qpt,
			      struct rvt_qpn_map *map, unsigned off)
{
	return (map - qpt->map) * RVT_BITS_PER_PAGE + off;
}

static inline unsigned find_next_offset(struct rvt_qpn_table *qpt,
					struct rvt_qpn_map *map, unsigned off,
					unsigned n, u16 qpt_mask)
{
	if (qpt_mask) {
		off++;
		if (((off & qpt_mask) >> 1) >= n)
			off = (off | qpt_mask) + 2;
	} else {
		off = find_next_zero_bit(map->page, RVT_BITS_PER_PAGE, off);
	}
	return off;
}

const struct rvt_operation_params qib_post_parms[RVT_OPERATION_MAX] = {
[IB_WR_RDMA_WRITE] = {
	.length = sizeof(struct ib_rdma_wr),
	.qpt_support = BIT(IB_QPT_UC) | BIT(IB_QPT_RC),
},

[IB_WR_RDMA_READ] = {
	.length = sizeof(struct ib_rdma_wr),
	.qpt_support = BIT(IB_QPT_RC),
	.flags = RVT_OPERATION_ATOMIC,
},

[IB_WR_ATOMIC_CMP_AND_SWP] = {
	.length = sizeof(struct ib_atomic_wr),
	.qpt_support = BIT(IB_QPT_RC),
	.flags = RVT_OPERATION_ATOMIC | RVT_OPERATION_ATOMIC_SGE,
},

[IB_WR_ATOMIC_FETCH_AND_ADD] = {
	.length = sizeof(struct ib_atomic_wr),
	.qpt_support = BIT(IB_QPT_RC),
	.flags = RVT_OPERATION_ATOMIC | RVT_OPERATION_ATOMIC_SGE,
},

[IB_WR_RDMA_WRITE_WITH_IMM] = {
	.length = sizeof(struct ib_rdma_wr),
	.qpt_support = BIT(IB_QPT_UC) | BIT(IB_QPT_RC),
},

[IB_WR_SEND] = {
	.length = sizeof(struct ib_send_wr),
	.qpt_support = BIT(IB_QPT_UD) | BIT(IB_QPT_SMI) | BIT(IB_QPT_GSI) |
		       BIT(IB_QPT_UC) | BIT(IB_QPT_RC),
},

[IB_WR_SEND_WITH_IMM] = {
	.length = sizeof(struct ib_send_wr),
	.qpt_support = BIT(IB_QPT_UD) | BIT(IB_QPT_SMI) | BIT(IB_QPT_GSI) |
		       BIT(IB_QPT_UC) | BIT(IB_QPT_RC),
},

};

static void get_map_page(struct rvt_qpn_table *qpt, struct rvt_qpn_map *map)
{
	unsigned long page = get_zeroed_page(GFP_KERNEL);

	/*
	 * Free the page if someone raced with us installing it.
	 */

	spin_lock(&qpt->lock);
	if (map->page)
		free_page(page);
	else
		map->page = (void *)page;
	spin_unlock(&qpt->lock);
}

/*
 * Allocate the next available QPN or
 * zero/one for QP type IB_QPT_SMI/IB_QPT_GSI.
 */
int qib_alloc_qpn(struct rvt_dev_info *rdi, struct rvt_qpn_table *qpt,
		  enum ib_qp_type type, u8 port)
{
	u32 i, offset, max_scan, qpn;
	struct rvt_qpn_map *map;
	u32 ret;
	struct qib_ibdev *verbs_dev = container_of(rdi, struct qib_ibdev, rdi);
	struct qib_devdata *dd = container_of(verbs_dev, struct qib_devdata,
					      verbs_dev);
	u16 qpt_mask = dd->qpn_mask;

	if (type == IB_QPT_SMI || type == IB_QPT_GSI) {
		unsigned n;

		ret = type == IB_QPT_GSI;
		n = 1 << (ret + 2 * (port - 1));
		spin_lock(&qpt->lock);
		if (qpt->flags & n)
			ret = -EINVAL;
		else
			qpt->flags |= n;
		spin_unlock(&qpt->lock);
		goto bail;
	}

	qpn = qpt->last + 2;
	if (qpn >= RVT_QPN_MAX)
		qpn = 2;
	if (qpt_mask && ((qpn & qpt_mask) >> 1) >= dd->n_krcv_queues)
		qpn = (qpn | qpt_mask) + 2;
	offset = qpn & RVT_BITS_PER_PAGE_MASK;
	map = &qpt->map[qpn / RVT_BITS_PER_PAGE];
	max_scan = qpt->nmaps - !offset;
	for (i = 0;;) {
		if (unlikely(!map->page)) {
			get_map_page(qpt, map);
			if (unlikely(!map->page))
				break;
		}
		do {
			if (!test_and_set_bit(offset, map->page)) {
				qpt->last = qpn;
				ret = qpn;
				goto bail;
			}
			offset = find_next_offset(qpt, map, offset,
				dd->n_krcv_queues, qpt_mask);
			qpn = mk_qpn(qpt, map, offset);
			/*
			 * This test differs from alloc_pidmap().
			 * If find_next_offset() does find a zero
			 * bit, we don't need to check for QPN
			 * wrapping around past our starting QPN.
			 * We just need to be sure we don't loop
			 * forever.
			 */
		} while (offset < RVT_BITS_PER_PAGE && qpn < RVT_QPN_MAX);
		/*
		 * In order to keep the number of pages allocated to a
		 * minimum, we scan the all existing pages before increasing
		 * the size of the bitmap table.
		 */
		if (++i > max_scan) {
			if (qpt->nmaps == RVT_QPNMAP_ENTRIES)
				break;
			map = &qpt->map[qpt->nmaps++];
			offset = 0;
		} else if (map < &qpt->map[qpt->nmaps]) {
			++map;
			offset = 0;
		} else {
			map = &qpt->map[0];
			offset = 2;
		}
		qpn = mk_qpn(qpt, map, offset);
	}

	ret = -ENOMEM;

bail:
	return ret;
}

/**
 * qib_free_all_qps - check for QPs still in use
 */
unsigned qib_free_all_qps(struct rvt_dev_info *rdi)
{
	struct qib_ibdev *verbs_dev = container_of(rdi, struct qib_ibdev, rdi);
	struct qib_devdata *dd = container_of(verbs_dev, struct qib_devdata,
					      verbs_dev);
	unsigned n, qp_inuse = 0;

	for (n = 0; n < dd->num_pports; n++) {
		struct qib_ibport *ibp = &dd->pport[n].ibport_data;

		rcu_read_lock();
		if (rcu_dereference(ibp->rvp.qp[0]))
			qp_inuse++;
		if (rcu_dereference(ibp->rvp.qp[1]))
			qp_inuse++;
		rcu_read_unlock();
	}
	return qp_inuse;
}

void qib_notify_qp_reset(struct rvt_qp *qp)
{
	struct qib_qp_priv *priv = qp->priv;

	atomic_set(&priv->s_dma_busy, 0);
}

void qib_notify_error_qp(struct rvt_qp *qp)
{
	struct qib_qp_priv *priv = qp->priv;
	struct qib_ibdev *dev = to_idev(qp->ibqp.device);

	spin_lock(&dev->rdi.pending_lock);
	if (!list_empty(&priv->iowait) && !(qp->s_flags & RVT_S_BUSY)) {
		qp->s_flags &= ~RVT_S_ANY_WAIT_IO;
		list_del_init(&priv->iowait);
	}
	spin_unlock(&dev->rdi.pending_lock);

	if (!(qp->s_flags & RVT_S_BUSY)) {
		qp->s_hdrwords = 0;
		if (qp->s_rdma_mr) {
			rvt_put_mr(qp->s_rdma_mr);
			qp->s_rdma_mr = NULL;
		}
		if (priv->s_tx) {
			qib_put_txreq(priv->s_tx);
			priv->s_tx = NULL;
		}
	}
}

static int mtu_to_enum(u32 mtu)
{
	int enum_mtu;

	switch (mtu) {
	case 4096:
		enum_mtu = IB_MTU_4096;
		break;
	case 2048:
		enum_mtu = IB_MTU_2048;
		break;
	case 1024:
		enum_mtu = IB_MTU_1024;
		break;
	case 512:
		enum_mtu = IB_MTU_512;
		break;
	case 256:
		enum_mtu = IB_MTU_256;
		break;
	default:
		enum_mtu = IB_MTU_2048;
	}
	return enum_mtu;
}

int qib_get_pmtu_from_attr(struct rvt_dev_info *rdi, struct rvt_qp *qp,
			   struct ib_qp_attr *attr)
{
	int mtu, pmtu, pidx = qp->port_num - 1;
	struct qib_ibdev *verbs_dev = container_of(rdi, struct qib_ibdev, rdi);
	struct qib_devdata *dd = container_of(verbs_dev, struct qib_devdata,
					      verbs_dev);
	mtu = ib_mtu_enum_to_int(attr->path_mtu);
	if (mtu == -1)
		return -EINVAL;

	if (mtu > dd->pport[pidx].ibmtu)
		pmtu = mtu_to_enum(dd->pport[pidx].ibmtu);
	else
		pmtu = attr->path_mtu;
	return pmtu;
}

int qib_mtu_to_path_mtu(u32 mtu)
{
	return mtu_to_enum(mtu);
}

u32 qib_mtu_from_qp(struct rvt_dev_info *rdi, struct rvt_qp *qp, u32 pmtu)
{
	return ib_mtu_enum_to_int(pmtu);
}

void *qib_qp_priv_alloc(struct rvt_dev_info *rdi, struct rvt_qp *qp)
{
	struct qib_qp_priv *priv;

	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return ERR_PTR(-ENOMEM);
	priv->owner = qp;

	priv->s_hdr = kzalloc(sizeof(*priv->s_hdr), GFP_KERNEL);
	if (!priv->s_hdr) {
		kfree(priv);
		return ERR_PTR(-ENOMEM);
	}
	init_waitqueue_head(&priv->wait_dma);
	INIT_WORK(&priv->s_work, _qib_do_send);
	INIT_LIST_HEAD(&priv->iowait);

	return priv;
}

void qib_qp_priv_free(struct rvt_dev_info *rdi, struct rvt_qp *qp)
{
	struct qib_qp_priv *priv = qp->priv;

	kfree(priv->s_hdr);
	kfree(priv);
}

void qib_stop_send_queue(struct rvt_qp *qp)
{
	struct qib_qp_priv *priv = qp->priv;

	cancel_work_sync(&priv->s_work);
}

void qib_quiesce_qp(struct rvt_qp *qp)
{
	struct qib_qp_priv *priv = qp->priv;

	wait_event(priv->wait_dma, !atomic_read(&priv->s_dma_busy));
	if (priv->s_tx) {
		qib_put_txreq(priv->s_tx);
		priv->s_tx = NULL;
	}
}

void qib_flush_qp_waiters(struct rvt_qp *qp)
{
	struct qib_qp_priv *priv = qp->priv;
	struct qib_ibdev *dev = to_idev(qp->ibqp.device);

	spin_lock(&dev->rdi.pending_lock);
	if (!list_empty(&priv->iowait))
		list_del_init(&priv->iowait);
	spin_unlock(&dev->rdi.pending_lock);
}

/**
 * qib_check_send_wqe - validate wr/wqe
 * @qp - The qp
 * @wqe - The built wqe
 *
 * validate wr/wqe.  This is called
 * prior to inserting the wqe into
 * the ring but after the wqe has been
 * setup.
 *
 * Returns 1 to force direct progress, 0 otherwise, -EINVAL on failure
 */
int qib_check_send_wqe(struct rvt_qp *qp,
		       struct rvt_swqe *wqe)
{
	struct rvt_ah *ah;
	int ret = 0;

	switch (qp->ibqp.qp_type) {
	case IB_QPT_RC:
	case IB_QPT_UC:
		if (wqe->length > 0x80000000U)
			return -EINVAL;
		break;
	case IB_QPT_SMI:
	case IB_QPT_GSI:
	case IB_QPT_UD:
		ah = ibah_to_rvtah(wqe->ud_wr.ah);
		if (wqe->length > (1 << ah->log_pmtu))
			return -EINVAL;
		/* progress hint */
		ret = 1;
		break;
	default:
		break;
	}
	return ret;
}

#ifdef CONFIG_DEBUG_FS

static const char * const qp_type_str[] = {
	"SMI", "GSI", "RC", "UC", "UD",
};

/**
 * qib_qp_iter_print - print information to seq_file
 * @s - the seq_file
 * @iter - the iterator
 */
void qib_qp_iter_print(struct seq_file *s, struct rvt_qp_iter *iter)
{
	struct rvt_swqe *wqe;
	struct rvt_qp *qp = iter->qp;
	struct qib_qp_priv *priv = qp->priv;

	wqe = rvt_get_swqe_ptr(qp, qp->s_last);
	seq_printf(s,
		   "N %d QP%u %s %u %u %u f=%x %u %u %u %u %u PSN %x %x %x %x %x (%u %u %u %u %u %u) QP%u LID %x\n",
		   iter->n,
		   qp->ibqp.qp_num,
		   qp_type_str[qp->ibqp.qp_type],
		   qp->state,
		   wqe->wr.opcode,
		   qp->s_hdrwords,
		   qp->s_flags,
		   atomic_read(&priv->s_dma_busy),
		   !list_empty(&priv->iowait),
		   qp->timeout,
		   wqe->ssn,
		   qp->s_lsn,
		   qp->s_last_psn,
		   qp->s_psn, qp->s_next_psn,
		   qp->s_sending_psn, qp->s_sending_hpsn,
		   qp->s_last, qp->s_acked, qp->s_cur,
		   qp->s_tail, qp->s_head, qp->s_size,
		   qp->remote_qpn,
		   rdma_ah_get_dlid(&qp->remote_ah_attr));
}

#endif