summaryrefslogtreecommitdiffstats
path: root/drivers/infiniband/hw/usnic/usnic_vnic.c
blob: 656b88c39edab15c27214e2e963ce31104fcb2e5 (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
/*
 * Copyright (c) 2013, Cisco Systems, Inc. All rights reserved.
 *
 * This program is free software; you may redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * 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/errno.h>
#include <linux/module.h>
#include <linux/pci.h>

#include "usnic_ib.h"
#include "vnic_resource.h"
#include "usnic_log.h"
#include "usnic_vnic.h"

struct usnic_vnic {
	struct vnic_dev			*vdev;
	struct vnic_dev_bar		bar[PCI_NUM_RESOURCES];
	struct usnic_vnic_res_chunk	chunks[USNIC_VNIC_RES_TYPE_MAX];
	spinlock_t			res_lock;
};

static enum vnic_res_type _to_vnic_res_type(enum usnic_vnic_res_type res_type)
{
#define DEFINE_USNIC_VNIC_RES_AT(usnic_vnic_res_t, vnic_res_type, desc, val) \
		vnic_res_type,
#define DEFINE_USNIC_VNIC_RES(usnic_vnic_res_t, vnic_res_type, desc) \
		vnic_res_type,
	static enum vnic_res_type usnic_vnic_type_2_vnic_type[] = {
						USNIC_VNIC_RES_TYPES};
#undef DEFINE_USNIC_VNIC_RES
#undef DEFINE_USNIC_VNIC_RES_AT

	if (res_type >= USNIC_VNIC_RES_TYPE_MAX)
		return RES_TYPE_MAX;

	return usnic_vnic_type_2_vnic_type[res_type];
}

const char *usnic_vnic_res_type_to_str(enum usnic_vnic_res_type res_type)
{
#define DEFINE_USNIC_VNIC_RES_AT(usnic_vnic_res_t, vnic_res_type, desc, val) \
		desc,
#define DEFINE_USNIC_VNIC_RES(usnic_vnic_res_t, vnic_res_type, desc) \
		desc,
	static const char * const usnic_vnic_res_type_desc[] = {
						USNIC_VNIC_RES_TYPES};
#undef DEFINE_USNIC_VNIC_RES
#undef DEFINE_USNIC_VNIC_RES_AT

	if (res_type >= USNIC_VNIC_RES_TYPE_MAX)
		return "unknown";

	return usnic_vnic_res_type_desc[res_type];

}

const char *usnic_vnic_pci_name(struct usnic_vnic *vnic)
{
	return pci_name(usnic_vnic_get_pdev(vnic));
}

int usnic_vnic_dump(struct usnic_vnic *vnic, char *buf,
			int buf_sz,
			void *hdr_obj,
			int (*printtitle)(void *, char*, int),
			int (*printcols)(char *, int),
			int (*printrow)(void *, char *, int))
{
	struct usnic_vnic_res_chunk *chunk;
	struct usnic_vnic_res *res;
	struct vnic_dev_bar *bar0;
	int i, j, offset;

	offset = 0;
	bar0 = usnic_vnic_get_bar(vnic, 0);
	offset += scnprintf(buf + offset, buf_sz - offset,
			"VF:%hu BAR0 bus_addr=%pa vaddr=0x%p size=%ld ",
			usnic_vnic_get_index(vnic),
			&bar0->bus_addr,
			bar0->vaddr, bar0->len);
	if (printtitle)
		offset += printtitle(hdr_obj, buf + offset, buf_sz - offset);
	offset += scnprintf(buf + offset, buf_sz - offset, "\n");
	offset += scnprintf(buf + offset, buf_sz - offset,
			"|RES\t|CTRL_PIN\t\t|IN_USE\t");
	if (printcols)
		offset += printcols(buf + offset, buf_sz - offset);
	offset += scnprintf(buf + offset, buf_sz - offset, "\n");

	spin_lock(&vnic->res_lock);
	for (i = 0; i < ARRAY_SIZE(vnic->chunks); i++) {
		chunk = &vnic->chunks[i];
		for (j = 0; j < chunk->cnt; j++) {
			res = chunk->res[j];
			offset += scnprintf(buf + offset, buf_sz - offset,
					"|%s[%u]\t|0x%p\t|%u\t",
					usnic_vnic_res_type_to_str(res->type),
					res->vnic_idx, res->ctrl, !!res->owner);
			if (printrow) {
				offset += printrow(res->owner, buf + offset,
							buf_sz - offset);
			}
			offset += scnprintf(buf + offset, buf_sz - offset,
						"\n");
		}
	}
	spin_unlock(&vnic->res_lock);
	return offset;
}

void usnic_vnic_res_spec_update(struct usnic_vnic_res_spec *spec,
				enum usnic_vnic_res_type trgt_type,
				u16 cnt)
{
	int i;

	for (i = 0; i < USNIC_VNIC_RES_TYPE_MAX; i++) {
		if (spec->resources[i].type == trgt_type) {
			spec->resources[i].cnt = cnt;
			return;
		}
	}

	WARN_ON(1);
}

int usnic_vnic_res_spec_satisfied(const struct usnic_vnic_res_spec *min_spec,
					struct usnic_vnic_res_spec *res_spec)
{
	int found, i, j;

	for (i = 0; i < USNIC_VNIC_RES_TYPE_MAX; i++) {
		found = 0;

		for (j = 0; j < USNIC_VNIC_RES_TYPE_MAX; j++) {
			if (res_spec->resources[i].type !=
				min_spec->resources[i].type)
				continue;
			found = 1;
			if (min_spec->resources[i].cnt >
					res_spec->resources[i].cnt)
				return -EINVAL;
			break;
		}

		if (!found)
			return -EINVAL;
	}
	return 0;
}

int usnic_vnic_spec_dump(char *buf, int buf_sz,
				struct usnic_vnic_res_spec *res_spec)
{
	enum usnic_vnic_res_type res_type;
	int res_cnt;
	int i;
	int offset = 0;

	for (i = 0; i < USNIC_VNIC_RES_TYPE_MAX; i++) {
		res_type = res_spec->resources[i].type;
		res_cnt = res_spec->resources[i].cnt;
		offset += scnprintf(buf + offset, buf_sz - offset,
				"Res: %s Cnt: %d ",
				usnic_vnic_res_type_to_str(res_type),
				res_cnt);
	}

	return offset;
}

int usnic_vnic_check_room(struct usnic_vnic *vnic,
				struct usnic_vnic_res_spec *res_spec)
{
	int i;
	enum usnic_vnic_res_type res_type;
	int res_cnt;

	for (i = 0; i < USNIC_VNIC_RES_TYPE_MAX; i++) {
		res_type = res_spec->resources[i].type;
		res_cnt = res_spec->resources[i].cnt;

		if (res_type == USNIC_VNIC_RES_TYPE_EOL)
			break;

		if (res_cnt > usnic_vnic_res_free_cnt(vnic, res_type))
			return -EBUSY;
	}

	return 0;
}

int usnic_vnic_res_cnt(struct usnic_vnic *vnic,
				enum usnic_vnic_res_type type)
{
	return vnic->chunks[type].cnt;
}

int usnic_vnic_res_free_cnt(struct usnic_vnic *vnic,
				enum usnic_vnic_res_type type)
{
	return vnic->chunks[type].free_cnt;
}

struct usnic_vnic_res_chunk *
usnic_vnic_get_resources(struct usnic_vnic *vnic, enum usnic_vnic_res_type type,
				int cnt, void *owner)
{
	struct usnic_vnic_res_chunk *src, *ret;
	struct usnic_vnic_res *res;
	int i;

	if (usnic_vnic_res_free_cnt(vnic, type) < cnt || cnt < 1 || !owner)
		return ERR_PTR(-EINVAL);

	ret = kzalloc(sizeof(*ret), GFP_ATOMIC);
	if (!ret) {
		usnic_err("Failed to allocate chunk for %s - Out of memory\n",
				usnic_vnic_pci_name(vnic));
		return ERR_PTR(-ENOMEM);
	}

	ret->res = kzalloc(sizeof(*(ret->res))*cnt, GFP_ATOMIC);
	if (!ret->res) {
		usnic_err("Failed to allocate resources for %s. Out of memory\n",
				usnic_vnic_pci_name(vnic));
		kfree(ret);
		return ERR_PTR(-ENOMEM);
	}

	spin_lock(&vnic->res_lock);
	src = &vnic->chunks[type];
	for (i = 0; i < src->cnt && ret->cnt < cnt; i++) {
		res = src->res[i];
		if (!res->owner) {
			src->free_cnt--;
			res->owner = owner;
			ret->res[ret->cnt++] = res;
		}
	}

	spin_unlock(&vnic->res_lock);
	ret->type = type;
	ret->vnic = vnic;
	WARN_ON(ret->cnt != cnt);

	return ret;
}

void usnic_vnic_put_resources(struct usnic_vnic_res_chunk *chunk)
{

	struct usnic_vnic_res *res;
	int i;
	struct usnic_vnic *vnic = chunk->vnic;

	spin_lock(&vnic->res_lock);
	while ((i = --chunk->cnt) >= 0) {
		res = chunk->res[i];
		chunk->res[i] = NULL;
		res->owner = NULL;
		vnic->chunks[res->type].free_cnt++;
	}
	spin_unlock(&vnic->res_lock);

	kfree(chunk->res);
	kfree(chunk);
}

u16 usnic_vnic_get_index(struct usnic_vnic *vnic)
{
	return usnic_vnic_get_pdev(vnic)->devfn - 1;
}

static int usnic_vnic_alloc_res_chunk(struct usnic_vnic *vnic,
					enum usnic_vnic_res_type type,
					struct usnic_vnic_res_chunk *chunk)
{
	int cnt, err, i;
	struct usnic_vnic_res *res;

	cnt = vnic_dev_get_res_count(vnic->vdev, _to_vnic_res_type(type));
	if (cnt < 1)
		return -EINVAL;

	chunk->cnt = chunk->free_cnt = cnt;
	chunk->res = kzalloc(sizeof(*(chunk->res))*cnt, GFP_KERNEL);
	if (!chunk->res)
		return -ENOMEM;

	for (i = 0; i < cnt; i++) {
		res = kzalloc(sizeof(*res), GFP_KERNEL);
		if (!res) {
			err = -ENOMEM;
			goto fail;
		}
		res->type = type;
		res->vnic_idx = i;
		res->vnic = vnic;
		res->ctrl = vnic_dev_get_res(vnic->vdev,
						_to_vnic_res_type(type), i);
		chunk->res[i] = res;
	}

	chunk->vnic = vnic;
	return 0;
fail:
	for (i--; i >= 0; i--)
		kfree(chunk->res[i]);
	kfree(chunk->res);
	return err;
}

static void usnic_vnic_free_res_chunk(struct usnic_vnic_res_chunk *chunk)
{
	int i;
	for (i = 0; i < chunk->cnt; i++)
		kfree(chunk->res[i]);
	kfree(chunk->res);
}

static int usnic_vnic_discover_resources(struct pci_dev *pdev,
						struct usnic_vnic *vnic)
{
	enum usnic_vnic_res_type res_type;
	int i;
	int err = 0;

	for (i = 0; i < ARRAY_SIZE(vnic->bar); i++) {
		if (!(pci_resource_flags(pdev, i) & IORESOURCE_MEM))
			continue;
		vnic->bar[i].len = pci_resource_len(pdev, i);
		vnic->bar[i].vaddr = pci_iomap(pdev, i, vnic->bar[i].len);
		if (!vnic->bar[i].vaddr) {
			usnic_err("Cannot memory-map BAR %d, aborting\n",
					i);
			err = -ENODEV;
			goto out_clean_bar;
		}
		vnic->bar[i].bus_addr = pci_resource_start(pdev, i);
	}

	vnic->vdev = vnic_dev_register(NULL, pdev, pdev, vnic->bar,
			ARRAY_SIZE(vnic->bar));
	if (!vnic->vdev) {
		usnic_err("Failed to register device %s\n",
				pci_name(pdev));
		err = -EINVAL;
		goto out_clean_bar;
	}

	for (res_type = USNIC_VNIC_RES_TYPE_EOL + 1;
			res_type < USNIC_VNIC_RES_TYPE_MAX; res_type++) {
		err = usnic_vnic_alloc_res_chunk(vnic, res_type,
						&vnic->chunks[res_type]);
		if (err) {
			usnic_err("Failed to alloc res %s with err %d\n",
					usnic_vnic_res_type_to_str(res_type),
					err);
			goto out_clean_chunks;
		}
	}

	return 0;

out_clean_chunks:
	for (res_type--; res_type > USNIC_VNIC_RES_TYPE_EOL; res_type--)
		usnic_vnic_free_res_chunk(&vnic->chunks[res_type]);
	vnic_dev_unregister(vnic->vdev);
out_clean_bar:
	for (i = 0; i < ARRAY_SIZE(vnic->bar); i++) {
		if (!(pci_resource_flags(pdev, i) & IORESOURCE_MEM))
			continue;
		if (!vnic->bar[i].vaddr)
			break;

		iounmap(vnic->bar[i].vaddr);
	}

	return err;
}

struct pci_dev *usnic_vnic_get_pdev(struct usnic_vnic *vnic)
{
	return vnic_dev_get_pdev(vnic->vdev);
}

struct vnic_dev_bar *usnic_vnic_get_bar(struct usnic_vnic *vnic,
				int bar_num)
{
	return (bar_num < ARRAY_SIZE(vnic->bar)) ? &vnic->bar[bar_num] : NULL;
}

static void usnic_vnic_release_resources(struct usnic_vnic *vnic)
{
	int i;
	struct pci_dev *pdev;
	enum usnic_vnic_res_type res_type;

	pdev = usnic_vnic_get_pdev(vnic);

	for (res_type = USNIC_VNIC_RES_TYPE_EOL + 1;
			res_type < USNIC_VNIC_RES_TYPE_MAX; res_type++)
		usnic_vnic_free_res_chunk(&vnic->chunks[res_type]);

	vnic_dev_unregister(vnic->vdev);

	for (i = 0; i < ARRAY_SIZE(vnic->bar); i++) {
		if (!(pci_resource_flags(pdev, i) & IORESOURCE_MEM))
			continue;
		iounmap(vnic->bar[i].vaddr);
	}
}

struct usnic_vnic *usnic_vnic_alloc(struct pci_dev *pdev)
{
	struct usnic_vnic *vnic;
	int err = 0;

	if (!pci_is_enabled(pdev)) {
		usnic_err("PCI dev %s is disabled\n", pci_name(pdev));
		return ERR_PTR(-EINVAL);
	}

	vnic = kzalloc(sizeof(*vnic), GFP_KERNEL);
	if (!vnic) {
		usnic_err("Failed to alloc vnic for %s - out of memory\n",
				pci_name(pdev));
		return ERR_PTR(-ENOMEM);
	}

	spin_lock_init(&vnic->res_lock);

	err = usnic_vnic_discover_resources(pdev, vnic);
	if (err) {
		usnic_err("Failed to discover %s resources with err %d\n",
				pci_name(pdev), err);
		goto out_free_vnic;
	}

	usnic_dbg("Allocated vnic for %s\n", usnic_vnic_pci_name(vnic));

	return vnic;

out_free_vnic:
	kfree(vnic);

	return ERR_PTR(err);
}

void usnic_vnic_free(struct usnic_vnic *vnic)
{
	usnic_vnic_release_resources(vnic);
	kfree(vnic);
}