device.c 31.1 KB
Newer Older
L
Linus Torvalds 已提交
1 2
/*
 * Copyright (c) 2004 Topspin Communications.  All rights reserved.
3
 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
L
Linus Torvalds 已提交
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
 *
 * 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/module.h>
#include <linux/string.h>
#include <linux/errno.h>
37
#include <linux/kernel.h>
L
Linus Torvalds 已提交
38 39
#include <linux/slab.h>
#include <linux/init.h>
40
#include <linux/mutex.h>
41
#include <linux/netdevice.h>
42 43
#include <linux/security.h>
#include <linux/notifier.h>
R
Roland Dreier 已提交
44
#include <rdma/rdma_netlink.h>
45 46
#include <rdma/ib_addr.h>
#include <rdma/ib_cache.h>
L
Linus Torvalds 已提交
47 48 49 50 51 52 53 54 55 56 57

#include "core_priv.h"

MODULE_AUTHOR("Roland Dreier");
MODULE_DESCRIPTION("core kernel InfiniBand API");
MODULE_LICENSE("Dual BSD/GPL");

struct ib_client_data {
	struct list_head  list;
	struct ib_client *client;
	void *            data;
58 59 60
	/* The device or client is going down. Do not call client or device
	 * callbacks other than remove(). */
	bool		  going_down;
L
Linus Torvalds 已提交
61 62
};

63
struct workqueue_struct *ib_comp_wq;
T
Tejun Heo 已提交
64 65 66
struct workqueue_struct *ib_wq;
EXPORT_SYMBOL_GPL(ib_wq);

67 68 69
/* The device_list and client_list contain devices and clients after their
 * registration has completed, and the devices and clients are removed
 * during unregistration. */
L
Linus Torvalds 已提交
70 71 72 73
static LIST_HEAD(device_list);
static LIST_HEAD(client_list);

/*
74 75 76 77 78 79 80
 * device_mutex and lists_rwsem protect access to both device_list and
 * client_list.  device_mutex protects writer access by device and client
 * registration / de-registration.  lists_rwsem protects reader access to
 * these lists.  Iterators of these lists must lock it for read, while updates
 * to the lists must be done with a write lock. A special case is when the
 * device_mutex is locked. In this case locking the lists for read access is
 * not necessary as the device_mutex implies it.
81 82
 *
 * lists_rwsem also protects access to the client data list.
L
Linus Torvalds 已提交
83
 */
84
static DEFINE_MUTEX(device_mutex);
85 86
static DECLARE_RWSEM(lists_rwsem);

87 88 89 90 91 92 93 94
static int ib_security_change(struct notifier_block *nb, unsigned long event,
			      void *lsm_data);
static void ib_policy_change_task(struct work_struct *work);
static DECLARE_WORK(ib_policy_change_work, ib_policy_change_task);

static struct notifier_block ibdev_lsm_nb = {
	.notifier_call = ib_security_change,
};
L
Linus Torvalds 已提交
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

static int ib_device_check_mandatory(struct ib_device *device)
{
#define IB_MANDATORY_FUNC(x) { offsetof(struct ib_device, x), #x }
	static const struct {
		size_t offset;
		char  *name;
	} mandatory_table[] = {
		IB_MANDATORY_FUNC(query_device),
		IB_MANDATORY_FUNC(query_port),
		IB_MANDATORY_FUNC(query_pkey),
		IB_MANDATORY_FUNC(query_gid),
		IB_MANDATORY_FUNC(alloc_pd),
		IB_MANDATORY_FUNC(dealloc_pd),
		IB_MANDATORY_FUNC(create_ah),
		IB_MANDATORY_FUNC(destroy_ah),
		IB_MANDATORY_FUNC(create_qp),
		IB_MANDATORY_FUNC(modify_qp),
		IB_MANDATORY_FUNC(destroy_qp),
		IB_MANDATORY_FUNC(post_send),
		IB_MANDATORY_FUNC(post_recv),
		IB_MANDATORY_FUNC(create_cq),
		IB_MANDATORY_FUNC(destroy_cq),
		IB_MANDATORY_FUNC(poll_cq),
		IB_MANDATORY_FUNC(req_notify_cq),
		IB_MANDATORY_FUNC(get_dma_mr),
121 122
		IB_MANDATORY_FUNC(dereg_mr),
		IB_MANDATORY_FUNC(get_port_immutable)
L
Linus Torvalds 已提交
123 124 125
	};
	int i;

126
	for (i = 0; i < ARRAY_SIZE(mandatory_table); ++i) {
L
Linus Torvalds 已提交
127
		if (!*(void **) ((void *) device + mandatory_table[i].offset)) {
P
Parav Pandit 已提交
128 129
			pr_warn("Device %s is missing mandatory function %s\n",
				device->name, mandatory_table[i].name);
L
Linus Torvalds 已提交
130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150
			return -EINVAL;
		}
	}

	return 0;
}

static struct ib_device *__ib_device_get_by_name(const char *name)
{
	struct ib_device *device;

	list_for_each_entry(device, &device_list, core_list)
		if (!strncmp(name, device->name, IB_DEVICE_NAME_MAX))
			return device;

	return NULL;
}


static int alloc_name(char *name)
{
151
	unsigned long *inuse;
L
Linus Torvalds 已提交
152 153 154 155
	char buf[IB_DEVICE_NAME_MAX];
	struct ib_device *device;
	int i;

156
	inuse = (unsigned long *) get_zeroed_page(GFP_KERNEL);
L
Linus Torvalds 已提交
157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180
	if (!inuse)
		return -ENOMEM;

	list_for_each_entry(device, &device_list, core_list) {
		if (!sscanf(device->name, name, &i))
			continue;
		if (i < 0 || i >= PAGE_SIZE * 8)
			continue;
		snprintf(buf, sizeof buf, name, i);
		if (!strncmp(buf, device->name, IB_DEVICE_NAME_MAX))
			set_bit(i, inuse);
	}

	i = find_first_zero_bit(inuse, PAGE_SIZE * 8);
	free_page((unsigned long) inuse);
	snprintf(buf, sizeof buf, name, i);

	if (__ib_device_get_by_name(buf))
		return -ENFILE;

	strlcpy(name, buf, IB_DEVICE_NAME_MAX);
	return 0;
}

181 182 183 184
static void ib_device_release(struct device *device)
{
	struct ib_device *dev = container_of(device, struct ib_device, dev);

185 186 187 188 189 190 191 192 193 194
	WARN_ON(dev->reg_state == IB_DEV_REGISTERED);
	if (dev->reg_state == IB_DEV_UNREGISTERED) {
		/*
		 * In IB_DEV_UNINITIALIZED state, cache or port table
		 * is not even created. Free cache and port table only when
		 * device reaches UNREGISTERED state.
		 */
		ib_cache_release_one(dev);
		kfree(dev->port_immutable);
	}
195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218
	kfree(dev);
}

static int ib_device_uevent(struct device *device,
			    struct kobj_uevent_env *env)
{
	struct ib_device *dev = container_of(device, struct ib_device, dev);

	if (add_uevent_var(env, "NAME=%s", dev->name))
		return -ENOMEM;

	/*
	 * It would be nice to pass the node GUID with the event...
	 */

	return 0;
}

static struct class ib_class = {
	.name    = "infiniband",
	.dev_release = ib_device_release,
	.dev_uevent = ib_device_uevent,
};

L
Linus Torvalds 已提交
219 220 221 222 223 224 225 226 227 228 229 230
/**
 * ib_alloc_device - allocate an IB device struct
 * @size:size of structure to allocate
 *
 * Low-level drivers should use ib_alloc_device() to allocate &struct
 * ib_device.  @size is the size of the structure to be allocated,
 * including any private data used by the low-level driver.
 * ib_dealloc_device() must be used to free structures allocated with
 * ib_alloc_device().
 */
struct ib_device *ib_alloc_device(size_t size)
{
231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249
	struct ib_device *device;

	if (WARN_ON(size < sizeof(struct ib_device)))
		return NULL;

	device = kzalloc(size, GFP_KERNEL);
	if (!device)
		return NULL;

	device->dev.class = &ib_class;
	device_initialize(&device->dev);

	dev_set_drvdata(&device->dev, device);

	INIT_LIST_HEAD(&device->event_handler_list);
	spin_lock_init(&device->event_handler_lock);
	spin_lock_init(&device->client_data_lock);
	INIT_LIST_HEAD(&device->client_data_list);
	INIT_LIST_HEAD(&device->port_list);
L
Linus Torvalds 已提交
250

251
	return device;
L
Linus Torvalds 已提交
252 253 254 255 256 257 258 259 260 261 262
}
EXPORT_SYMBOL(ib_alloc_device);

/**
 * ib_dealloc_device - free an IB device struct
 * @device:structure to free
 *
 * Free a structure allocated with ib_alloc_device().
 */
void ib_dealloc_device(struct ib_device *device)
{
263 264
	WARN_ON(device->reg_state != IB_DEV_UNREGISTERED &&
		device->reg_state != IB_DEV_UNINITIALIZED);
265
	kobject_put(&device->dev.kobj);
L
Linus Torvalds 已提交
266 267 268 269 270 271 272 273 274
}
EXPORT_SYMBOL(ib_dealloc_device);

static int add_client_context(struct ib_device *device, struct ib_client *client)
{
	struct ib_client_data *context;
	unsigned long flags;

	context = kmalloc(sizeof *context, GFP_KERNEL);
275
	if (!context)
L
Linus Torvalds 已提交
276 277 278 279
		return -ENOMEM;

	context->client = client;
	context->data   = NULL;
280
	context->going_down = false;
L
Linus Torvalds 已提交
281

282
	down_write(&lists_rwsem);
L
Linus Torvalds 已提交
283 284 285
	spin_lock_irqsave(&device->client_data_lock, flags);
	list_add(&context->list, &device->client_data_list);
	spin_unlock_irqrestore(&device->client_data_lock, flags);
286
	up_write(&lists_rwsem);
L
Linus Torvalds 已提交
287 288 289 290

	return 0;
}

291 292 293 294 295 296
static int verify_immutable(const struct ib_device *dev, u8 port)
{
	return WARN_ON(!rdma_cap_ib_mad(dev, port) &&
			    rdma_max_mad_size(dev, port) != 0);
}

297
static int read_port_immutable(struct ib_device *device)
298
{
299
	int ret;
300 301 302 303 304 305 306 307 308 309 310 311 312 313 314
	u8 start_port = rdma_start_port(device);
	u8 end_port = rdma_end_port(device);
	u8 port;

	/**
	 * device->port_immutable is indexed directly by the port number to make
	 * access to this data as efficient as possible.
	 *
	 * Therefore port_immutable is declared as a 1 based array with
	 * potential empty slots at the beginning.
	 */
	device->port_immutable = kzalloc(sizeof(*device->port_immutable)
					 * (end_port + 1),
					 GFP_KERNEL);
	if (!device->port_immutable)
315
		return -ENOMEM;
316

317 318 319
	for (port = start_port; port <= end_port; ++port) {
		ret = device->get_port_immutable(device, port,
						 &device->port_immutable[port]);
320
		if (ret)
321
			return ret;
322

323 324
		if (verify_immutable(device, port))
			return -EINVAL;
325
	}
326
	return 0;
327 328
}

329 330 331 332 333 334 335 336 337
void ib_get_device_fw_str(struct ib_device *dev, char *str, size_t str_len)
{
	if (dev->get_dev_fw_str)
		dev->get_dev_fw_str(dev, str, str_len);
	else
		str[0] = '\0';
}
EXPORT_SYMBOL(ib_get_device_fw_str);

338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361
static int setup_port_pkey_list(struct ib_device *device)
{
	int i;

	/**
	 * device->port_pkey_list is indexed directly by the port number,
	 * Therefore it is declared as a 1 based array with potential empty
	 * slots at the beginning.
	 */
	device->port_pkey_list = kcalloc(rdma_end_port(device) + 1,
					 sizeof(*device->port_pkey_list),
					 GFP_KERNEL);

	if (!device->port_pkey_list)
		return -ENOMEM;

	for (i = 0; i < (rdma_end_port(device) + 1); i++) {
		spin_lock_init(&device->port_pkey_list[i].list_lock);
		INIT_LIST_HEAD(&device->port_pkey_list[i].pkey_list);
	}

	return 0;
}

362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378
static void ib_policy_change_task(struct work_struct *work)
{
	struct ib_device *dev;

	down_read(&lists_rwsem);
	list_for_each_entry(dev, &device_list, core_list) {
		int i;

		for (i = rdma_start_port(dev); i <= rdma_end_port(dev); i++) {
			u64 sp;
			int ret = ib_get_cached_subnet_prefix(dev,
							      i,
							      &sp);

			WARN_ONCE(ret,
				  "ib_get_cached_subnet_prefix err: %d, this should never happen here\n",
				  ret);
379 380
			if (!ret)
				ib_security_cache_change(dev, i, sp);
381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396
		}
	}
	up_read(&lists_rwsem);
}

static int ib_security_change(struct notifier_block *nb, unsigned long event,
			      void *lsm_data)
{
	if (event != LSM_POLICY_CHANGE)
		return NOTIFY_DONE;

	schedule_work(&ib_policy_change_work);

	return NOTIFY_OK;
}

L
Linus Torvalds 已提交
397 398 399 400 401 402 403 404 405
/**
 * ib_register_device - Register an IB device with IB core
 * @device:Device to register
 *
 * Low-level drivers use ib_register_device() to register their
 * devices with the IB core.  All registered clients will receive a
 * callback for each device that is added. @device must be allocated
 * with ib_alloc_device().
 */
406 407 408
int ib_register_device(struct ib_device *device,
		       int (*port_callback)(struct ib_device *,
					    u8, struct kobject *))
L
Linus Torvalds 已提交
409 410
{
	int ret;
411
	struct ib_client *client;
412
	struct ib_udata uhw = {.outlen = 0, .inlen = 0};
413 414 415
	struct device *parent = device->dev.parent;

	WARN_ON_ONCE(!parent);
416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435
	WARN_ON_ONCE(device->dma_device);
	if (device->dev.dma_ops) {
		/*
		 * The caller provided custom DMA operations. Copy the
		 * DMA-related fields that are used by e.g. dma_alloc_coherent()
		 * into device->dev.
		 */
		device->dma_device = &device->dev;
		if (!device->dev.dma_mask)
			device->dev.dma_mask = parent->dma_mask;
		if (!device->dev.coherent_dma_mask)
			device->dev.coherent_dma_mask =
				parent->coherent_dma_mask;
	} else {
		/*
		 * The caller did not provide custom DMA operations. Use the
		 * DMA mapping operations of the parent device.
		 */
		device->dma_device = parent;
	}
L
Linus Torvalds 已提交
436

437
	mutex_lock(&device_mutex);
L
Linus Torvalds 已提交
438 439 440 441 442 443 444 445 446 447 448 449

	if (strchr(device->name, '%')) {
		ret = alloc_name(device->name);
		if (ret)
			goto out;
	}

	if (ib_device_check_mandatory(device)) {
		ret = -EINVAL;
		goto out;
	}

450
	ret = read_port_immutable(device);
451
	if (ret) {
P
Parav Pandit 已提交
452 453
		pr_warn("Couldn't create per port immutable data %s\n",
			device->name);
454 455 456
		goto out;
	}

457 458 459 460 461 462
	ret = setup_port_pkey_list(device);
	if (ret) {
		pr_warn("Couldn't create per port_pkey_list\n");
		goto out;
	}

463 464
	ret = ib_cache_setup_one(device);
	if (ret) {
P
Parav Pandit 已提交
465
		pr_warn("Couldn't set up InfiniBand P_Key/GID cache\n");
466
		goto port_cleanup;
467 468
	}

469 470 471
	ret = ib_device_register_rdmacg(device);
	if (ret) {
		pr_warn("Couldn't register device with rdma cgroup\n");
472
		goto cache_cleanup;
473 474
	}

475 476 477
	memset(&device->attrs, 0, sizeof(device->attrs));
	ret = device->query_device(device, &device->attrs, &uhw);
	if (ret) {
P
Parav Pandit 已提交
478
		pr_warn("Couldn't query the device attributes\n");
479
		goto cache_cleanup;
480 481
	}

482
	ret = ib_device_register_sysfs(device, port_callback);
L
Linus Torvalds 已提交
483
	if (ret) {
P
Parav Pandit 已提交
484 485
		pr_warn("Couldn't register device %s with driver model\n",
			device->name);
486
		goto cache_cleanup;
L
Linus Torvalds 已提交
487 488 489 490
	}

	device->reg_state = IB_DEV_REGISTERED;

491 492 493
	list_for_each_entry(client, &client_list, list)
		if (client->add && !add_client_context(device, client))
			client->add(device);
L
Linus Torvalds 已提交
494

495 496 497
	down_write(&lists_rwsem);
	list_add_tail(&device->core_list, &device_list);
	up_write(&lists_rwsem);
498 499 500 501 502 503 504 505
	mutex_unlock(&device_mutex);
	return 0;

cache_cleanup:
	ib_cache_cleanup_one(device);
	ib_cache_release_one(device);
port_cleanup:
	kfree(device->port_immutable);
506
out:
507
	mutex_unlock(&device_mutex);
L
Linus Torvalds 已提交
508 509 510 511 512 513 514 515 516 517 518 519 520 521 522
	return ret;
}
EXPORT_SYMBOL(ib_register_device);

/**
 * ib_unregister_device - Unregister an IB device
 * @device:Device to unregister
 *
 * Unregister an IB device.  All clients will receive a remove callback.
 */
void ib_unregister_device(struct ib_device *device)
{
	struct ib_client_data *context, *tmp;
	unsigned long flags;

523
	mutex_lock(&device_mutex);
L
Linus Torvalds 已提交
524

525 526
	down_write(&lists_rwsem);
	list_del(&device->core_list);
527 528 529 530 531
	spin_lock_irqsave(&device->client_data_lock, flags);
	list_for_each_entry_safe(context, tmp, &device->client_data_list, list)
		context->going_down = true;
	spin_unlock_irqrestore(&device->client_data_lock, flags);
	downgrade_write(&lists_rwsem);
532

533 534 535 536 537 538
	list_for_each_entry_safe(context, tmp, &device->client_data_list,
				 list) {
		if (context->client->remove)
			context->client->remove(device, context->data);
	}
	up_read(&lists_rwsem);
L
Linus Torvalds 已提交
539

540
	mutex_unlock(&device_mutex);
L
Linus Torvalds 已提交
541

542
	ib_device_unregister_rdmacg(device);
543
	ib_device_unregister_sysfs(device);
544
	ib_cache_cleanup_one(device);
545

546 547 548
	ib_security_destroy_port_pkey_list(device);
	kfree(device->port_pkey_list);

549
	down_write(&lists_rwsem);
L
Linus Torvalds 已提交
550 551 552 553
	spin_lock_irqsave(&device->client_data_lock, flags);
	list_for_each_entry_safe(context, tmp, &device->client_data_list, list)
		kfree(context);
	spin_unlock_irqrestore(&device->client_data_lock, flags);
554
	up_write(&lists_rwsem);
L
Linus Torvalds 已提交
555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576

	device->reg_state = IB_DEV_UNREGISTERED;
}
EXPORT_SYMBOL(ib_unregister_device);

/**
 * ib_register_client - Register an IB client
 * @client:Client to register
 *
 * Upper level users of the IB drivers can use ib_register_client() to
 * register callbacks for IB device addition and removal.  When an IB
 * device is added, each registered client's add method will be called
 * (in the order the clients were registered), and when a device is
 * removed, each client's remove method will be called (in the reverse
 * order that clients were registered).  In addition, when
 * ib_register_client() is called, the client will receive an add
 * callback for all devices already registered.
 */
int ib_register_client(struct ib_client *client)
{
	struct ib_device *device;

577
	mutex_lock(&device_mutex);
L
Linus Torvalds 已提交
578 579 580 581 582

	list_for_each_entry(device, &device_list, core_list)
		if (client->add && !add_client_context(device, client))
			client->add(device);

583 584 585 586
	down_write(&lists_rwsem);
	list_add_tail(&client->list, &client_list);
	up_write(&lists_rwsem);

587
	mutex_unlock(&device_mutex);
L
Linus Torvalds 已提交
588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606

	return 0;
}
EXPORT_SYMBOL(ib_register_client);

/**
 * ib_unregister_client - Unregister an IB client
 * @client:Client to unregister
 *
 * Upper level users use ib_unregister_client() to remove their client
 * registration.  When ib_unregister_client() is called, the client
 * will receive a remove callback for each IB device still registered.
 */
void ib_unregister_client(struct ib_client *client)
{
	struct ib_client_data *context, *tmp;
	struct ib_device *device;
	unsigned long flags;

607
	mutex_lock(&device_mutex);
L
Linus Torvalds 已提交
608

609 610 611 612
	down_write(&lists_rwsem);
	list_del(&client->list);
	up_write(&lists_rwsem);

L
Linus Torvalds 已提交
613
	list_for_each_entry(device, &device_list, core_list) {
614
		struct ib_client_data *found_context = NULL;
L
Linus Torvalds 已提交
615

616
		down_write(&lists_rwsem);
L
Linus Torvalds 已提交
617 618 619
		spin_lock_irqsave(&device->client_data_lock, flags);
		list_for_each_entry_safe(context, tmp, &device->client_data_list, list)
			if (context->client == client) {
620 621 622
				context->going_down = true;
				found_context = context;
				break;
L
Linus Torvalds 已提交
623 624
			}
		spin_unlock_irqrestore(&device->client_data_lock, flags);
625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642
		up_write(&lists_rwsem);

		if (client->remove)
			client->remove(device, found_context ?
					       found_context->data : NULL);

		if (!found_context) {
			pr_warn("No client context found for %s/%s\n",
				device->name, client->name);
			continue;
		}

		down_write(&lists_rwsem);
		spin_lock_irqsave(&device->client_data_lock, flags);
		list_del(&found_context->list);
		kfree(found_context);
		spin_unlock_irqrestore(&device->client_data_lock, flags);
		up_write(&lists_rwsem);
L
Linus Torvalds 已提交
643 644
	}

645
	mutex_unlock(&device_mutex);
L
Linus Torvalds 已提交
646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675
}
EXPORT_SYMBOL(ib_unregister_client);

/**
 * ib_get_client_data - Get IB client context
 * @device:Device to get context for
 * @client:Client to get context for
 *
 * ib_get_client_data() returns client context set with
 * ib_set_client_data().
 */
void *ib_get_client_data(struct ib_device *device, struct ib_client *client)
{
	struct ib_client_data *context;
	void *ret = NULL;
	unsigned long flags;

	spin_lock_irqsave(&device->client_data_lock, flags);
	list_for_each_entry(context, &device->client_data_list, list)
		if (context->client == client) {
			ret = context->data;
			break;
		}
	spin_unlock_irqrestore(&device->client_data_lock, flags);

	return ret;
}
EXPORT_SYMBOL(ib_get_client_data);

/**
676
 * ib_set_client_data - Set IB client context
L
Linus Torvalds 已提交
677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696
 * @device:Device to set context for
 * @client:Client to set context for
 * @data:Context to set
 *
 * ib_set_client_data() sets client context that can be retrieved with
 * ib_get_client_data().
 */
void ib_set_client_data(struct ib_device *device, struct ib_client *client,
			void *data)
{
	struct ib_client_data *context;
	unsigned long flags;

	spin_lock_irqsave(&device->client_data_lock, flags);
	list_for_each_entry(context, &device->client_data_list, list)
		if (context->client == client) {
			context->data = data;
			goto out;
		}

P
Parav Pandit 已提交
697 698
	pr_warn("No client context found for %s/%s\n",
		device->name, client->name);
L
Linus Torvalds 已提交
699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780

out:
	spin_unlock_irqrestore(&device->client_data_lock, flags);
}
EXPORT_SYMBOL(ib_set_client_data);

/**
 * ib_register_event_handler - Register an IB event handler
 * @event_handler:Handler to register
 *
 * ib_register_event_handler() registers an event handler that will be
 * called back when asynchronous IB events occur (as defined in
 * chapter 11 of the InfiniBand Architecture Specification).  This
 * callback may occur in interrupt context.
 */
int ib_register_event_handler  (struct ib_event_handler *event_handler)
{
	unsigned long flags;

	spin_lock_irqsave(&event_handler->device->event_handler_lock, flags);
	list_add_tail(&event_handler->list,
		      &event_handler->device->event_handler_list);
	spin_unlock_irqrestore(&event_handler->device->event_handler_lock, flags);

	return 0;
}
EXPORT_SYMBOL(ib_register_event_handler);

/**
 * ib_unregister_event_handler - Unregister an event handler
 * @event_handler:Handler to unregister
 *
 * Unregister an event handler registered with
 * ib_register_event_handler().
 */
int ib_unregister_event_handler(struct ib_event_handler *event_handler)
{
	unsigned long flags;

	spin_lock_irqsave(&event_handler->device->event_handler_lock, flags);
	list_del(&event_handler->list);
	spin_unlock_irqrestore(&event_handler->device->event_handler_lock, flags);

	return 0;
}
EXPORT_SYMBOL(ib_unregister_event_handler);

/**
 * ib_dispatch_event - Dispatch an asynchronous event
 * @event:Event to dispatch
 *
 * Low-level drivers must call ib_dispatch_event() to dispatch the
 * event to all registered event handlers when an asynchronous event
 * occurs.
 */
void ib_dispatch_event(struct ib_event *event)
{
	unsigned long flags;
	struct ib_event_handler *handler;

	spin_lock_irqsave(&event->device->event_handler_lock, flags);

	list_for_each_entry(handler, &event->device->event_handler_list, list)
		handler->handler(handler, event);

	spin_unlock_irqrestore(&event->device->event_handler_lock, flags);
}
EXPORT_SYMBOL(ib_dispatch_event);

/**
 * ib_query_port - Query IB port attributes
 * @device:Device to query
 * @port_num:Port number to query
 * @port_attr:Port attributes
 *
 * ib_query_port() returns the attributes of a port through the
 * @port_attr pointer.
 */
int ib_query_port(struct ib_device *device,
		  u8 port_num,
		  struct ib_port_attr *port_attr)
{
781 782 783
	union ib_gid gid;
	int err;

784
	if (!rdma_is_port_valid(device, port_num))
785 786
		return -EINVAL;

787 788 789 790 791
	memset(port_attr, 0, sizeof(*port_attr));
	err = device->query_port(device, port_num, port_attr);
	if (err || port_attr->subnet_prefix)
		return err;

792 793 794
	if (rdma_port_get_link_layer(device, port_num) != IB_LINK_LAYER_INFINIBAND)
		return 0;

795 796 797 798 799 800
	err = ib_query_gid(device, port_num, 0, &gid, NULL);
	if (err)
		return err;

	port_attr->subnet_prefix = be64_to_cpu(gid.global.subnet_prefix);
	return 0;
L
Linus Torvalds 已提交
801 802 803 804 805 806 807 808 809
}
EXPORT_SYMBOL(ib_query_port);

/**
 * ib_query_gid - Get GID table entry
 * @device:Device to query
 * @port_num:Port number to query
 * @index:GID table index to query
 * @gid:Returned GID
810 811
 * @attr: Returned GID attributes related to this GID index (only in RoCE).
 *   NULL means ignore.
L
Linus Torvalds 已提交
812 813 814 815
 *
 * ib_query_gid() fetches the specified GID table entry.
 */
int ib_query_gid(struct ib_device *device,
816 817
		 u8 port_num, int index, union ib_gid *gid,
		 struct ib_gid_attr *attr)
L
Linus Torvalds 已提交
818
{
819
	if (rdma_cap_roce_gid_table(device, port_num))
820 821 822 823
		return ib_get_cached_gid(device, port_num, index, gid, attr);

	if (attr)
		return -EINVAL;
824

L
Linus Torvalds 已提交
825 826 827 828
	return device->query_gid(device, port_num, index, gid);
}
EXPORT_SYMBOL(ib_query_gid);

829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894
/**
 * ib_enum_roce_netdev - enumerate all RoCE ports
 * @ib_dev : IB device we want to query
 * @filter: Should we call the callback?
 * @filter_cookie: Cookie passed to filter
 * @cb: Callback to call for each found RoCE ports
 * @cookie: Cookie passed back to the callback
 *
 * Enumerates all of the physical RoCE ports of ib_dev
 * which are related to netdevice and calls callback() on each
 * device for which filter() function returns non zero.
 */
void ib_enum_roce_netdev(struct ib_device *ib_dev,
			 roce_netdev_filter filter,
			 void *filter_cookie,
			 roce_netdev_callback cb,
			 void *cookie)
{
	u8 port;

	for (port = rdma_start_port(ib_dev); port <= rdma_end_port(ib_dev);
	     port++)
		if (rdma_protocol_roce(ib_dev, port)) {
			struct net_device *idev = NULL;

			if (ib_dev->get_netdev)
				idev = ib_dev->get_netdev(ib_dev, port);

			if (idev &&
			    idev->reg_state >= NETREG_UNREGISTERED) {
				dev_put(idev);
				idev = NULL;
			}

			if (filter(ib_dev, port, idev, filter_cookie))
				cb(ib_dev, port, idev, cookie);

			if (idev)
				dev_put(idev);
		}
}

/**
 * ib_enum_all_roce_netdevs - enumerate all RoCE devices
 * @filter: Should we call the callback?
 * @filter_cookie: Cookie passed to filter
 * @cb: Callback to call for each found RoCE ports
 * @cookie: Cookie passed back to the callback
 *
 * Enumerates all RoCE devices' physical ports which are related
 * to netdevices and calls callback() on each device for which
 * filter() function returns non zero.
 */
void ib_enum_all_roce_netdevs(roce_netdev_filter filter,
			      void *filter_cookie,
			      roce_netdev_callback cb,
			      void *cookie)
{
	struct ib_device *dev;

	down_read(&lists_rwsem);
	list_for_each_entry(dev, &device_list, core_list)
		ib_enum_roce_netdev(dev, filter, filter_cookie, cb, cookie);
	up_read(&lists_rwsem);
}

L
Linus Torvalds 已提交
895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923
/**
 * ib_query_pkey - Get P_Key table entry
 * @device:Device to query
 * @port_num:Port number to query
 * @index:P_Key table index to query
 * @pkey:Returned P_Key
 *
 * ib_query_pkey() fetches the specified P_Key table entry.
 */
int ib_query_pkey(struct ib_device *device,
		  u8 port_num, u16 index, u16 *pkey)
{
	return device->query_pkey(device, port_num, index, pkey);
}
EXPORT_SYMBOL(ib_query_pkey);

/**
 * ib_modify_device - Change IB device attributes
 * @device:Device to modify
 * @device_modify_mask:Mask of attributes to change
 * @device_modify:New attribute values
 *
 * ib_modify_device() changes a device's attributes as specified by
 * the @device_modify_mask and @device_modify structure.
 */
int ib_modify_device(struct ib_device *device,
		     int device_modify_mask,
		     struct ib_device_modify *device_modify)
{
924 925 926
	if (!device->modify_device)
		return -ENOSYS;

L
Linus Torvalds 已提交
927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946
	return device->modify_device(device, device_modify_mask,
				     device_modify);
}
EXPORT_SYMBOL(ib_modify_device);

/**
 * ib_modify_port - Modifies the attributes for the specified port.
 * @device: The device to modify.
 * @port_num: The number of the port to modify.
 * @port_modify_mask: Mask used to specify which attributes of the port
 *   to change.
 * @port_modify: New attribute values for the port.
 *
 * ib_modify_port() changes a port's attributes as specified by the
 * @port_modify_mask and @port_modify structure.
 */
int ib_modify_port(struct ib_device *device,
		   u8 port_num, int port_modify_mask,
		   struct ib_port_modify *port_modify)
{
947 948 949
	if (!device->modify_port)
		return -ENOSYS;

950
	if (!rdma_is_port_valid(device, port_num))
951 952
		return -EINVAL;

L
Linus Torvalds 已提交
953 954 955 956 957
	return device->modify_port(device, port_num, port_modify_mask,
				   port_modify);
}
EXPORT_SYMBOL(ib_modify_port);

958 959 960 961 962
/**
 * ib_find_gid - Returns the port number and GID table index where
 *   a specified GID value occurs.
 * @device: The device to query.
 * @gid: The GID value to search for.
963
 * @gid_type: Type of GID.
964
 * @ndev: The ndev related to the GID to search for.
965 966 967 968 969
 * @port_num: The port number of the device where the GID value was found.
 * @index: The index into the GID table where the GID was found.  This
 *   parameter may be NULL.
 */
int ib_find_gid(struct ib_device *device, union ib_gid *gid,
970 971
		enum ib_gid_type gid_type, struct net_device *ndev,
		u8 *port_num, u16 *index)
972 973 974 975
{
	union ib_gid tmp_gid;
	int ret, port, i;

976
	for (port = rdma_start_port(device); port <= rdma_end_port(device); ++port) {
977
		if (rdma_cap_roce_gid_table(device, port)) {
978
			if (!ib_find_cached_gid_by_port(device, gid, gid_type, port,
979
							ndev, index)) {
980 981
				*port_num = port;
				return 0;
982
			}
983 984
		}

985 986 987
		if (gid_type != IB_GID_TYPE_IB)
			continue;

988
		for (i = 0; i < device->port_immutable[port].gid_tbl_len; ++i) {
989
			ret = ib_query_gid(device, port, i, &tmp_gid, NULL);
990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017
			if (ret)
				return ret;
			if (!memcmp(&tmp_gid, gid, sizeof *gid)) {
				*port_num = port;
				if (index)
					*index = i;
				return 0;
			}
		}
	}

	return -ENOENT;
}
EXPORT_SYMBOL(ib_find_gid);

/**
 * ib_find_pkey - Returns the PKey table index where a specified
 *   PKey value occurs.
 * @device: The device to query.
 * @port_num: The port number of the device to search for the PKey.
 * @pkey: The PKey value to search for.
 * @index: The index into the PKey table where the PKey was found.
 */
int ib_find_pkey(struct ib_device *device,
		 u8 port_num, u16 pkey, u16 *index)
{
	int ret, i;
	u16 tmp_pkey;
1018
	int partial_ix = -1;
1019

1020
	for (i = 0; i < device->port_immutable[port_num].pkey_tbl_len; ++i) {
1021 1022 1023
		ret = ib_query_pkey(device, port_num, i, &tmp_pkey);
		if (ret)
			return ret;
1024
		if ((pkey & 0x7fff) == (tmp_pkey & 0x7fff)) {
1025 1026 1027 1028 1029 1030 1031
			/* if there is full-member pkey take it.*/
			if (tmp_pkey & 0x8000) {
				*index = i;
				return 0;
			}
			if (partial_ix < 0)
				partial_ix = i;
1032 1033 1034
		}
	}

1035 1036 1037 1038 1039
	/*no full-member, if exists take the limited*/
	if (partial_ix >= 0) {
		*index = partial_ix;
		return 0;
	}
1040 1041 1042 1043
	return -ENOENT;
}
EXPORT_SYMBOL(ib_find_pkey);

1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088
/**
 * ib_get_net_dev_by_params() - Return the appropriate net_dev
 * for a received CM request
 * @dev:	An RDMA device on which the request has been received.
 * @port:	Port number on the RDMA device.
 * @pkey:	The Pkey the request came on.
 * @gid:	A GID that the net_dev uses to communicate.
 * @addr:	Contains the IP address that the request specified as its
 *		destination.
 */
struct net_device *ib_get_net_dev_by_params(struct ib_device *dev,
					    u8 port,
					    u16 pkey,
					    const union ib_gid *gid,
					    const struct sockaddr *addr)
{
	struct net_device *net_dev = NULL;
	struct ib_client_data *context;

	if (!rdma_protocol_ib(dev, port))
		return NULL;

	down_read(&lists_rwsem);

	list_for_each_entry(context, &dev->client_data_list, list) {
		struct ib_client *client = context->client;

		if (context->going_down)
			continue;

		if (client->get_net_dev_by_params) {
			net_dev = client->get_net_dev_by_params(dev, port, pkey,
								gid, addr,
								context->data);
			if (net_dev)
				break;
		}
	}

	up_read(&lists_rwsem);

	return net_dev;
}
EXPORT_SYMBOL(ib_get_net_dev_by_params);

1089 1090 1091 1092 1093 1094 1095
static struct ibnl_client_cbs ibnl_ls_cb_table[] = {
	[RDMA_NL_LS_OP_RESOLVE] = {
		.dump = ib_nl_handle_resolve_resp,
		.module = THIS_MODULE },
	[RDMA_NL_LS_OP_SET_TIMEOUT] = {
		.dump = ib_nl_handle_set_timeout,
		.module = THIS_MODULE },
1096 1097 1098
	[RDMA_NL_LS_OP_IP_RESOLVE] = {
		.dump = ib_nl_handle_ip_res_resp,
		.module = THIS_MODULE },
1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111
};

static int ib_add_ibnl_clients(void)
{
	return ibnl_add_client(RDMA_NL_LS, ARRAY_SIZE(ibnl_ls_cb_table),
			       ibnl_ls_cb_table);
}

static void ib_remove_ibnl_clients(void)
{
	ibnl_remove_client(RDMA_NL_LS);
}

L
Linus Torvalds 已提交
1112 1113 1114 1115
static int __init ib_core_init(void)
{
	int ret;

T
Tejun Heo 已提交
1116 1117 1118 1119
	ib_wq = alloc_workqueue("infiniband", 0, 0);
	if (!ib_wq)
		return -ENOMEM;

1120
	ib_comp_wq = alloc_workqueue("ib-comp-wq",
1121
			WQ_HIGHPRI | WQ_MEM_RECLAIM | WQ_SYSFS, 0);
1122 1123 1124 1125 1126
	if (!ib_comp_wq) {
		ret = -ENOMEM;
		goto err;
	}

1127
	ret = class_register(&ib_class);
1128
	if (ret) {
P
Parav Pandit 已提交
1129
		pr_warn("Couldn't create InfiniBand device class\n");
1130
		goto err_comp;
1131
	}
L
Linus Torvalds 已提交
1132

R
Roland Dreier 已提交
1133 1134
	ret = ibnl_init();
	if (ret) {
P
Parav Pandit 已提交
1135
		pr_warn("Couldn't init IB netlink interface\n");
R
Roland Dreier 已提交
1136 1137 1138
		goto err_sysfs;
	}

1139 1140 1141 1142 1143 1144
	ret = addr_init();
	if (ret) {
		pr_warn("Could't init IB address resolution\n");
		goto err_ibnl;
	}

1145 1146 1147 1148 1149 1150
	ret = ib_mad_init();
	if (ret) {
		pr_warn("Couldn't init IB MAD\n");
		goto err_addr;
	}

1151 1152 1153 1154 1155 1156
	ret = ib_sa_init();
	if (ret) {
		pr_warn("Couldn't init SA\n");
		goto err_mad;
	}

1157 1158
	ret = ib_add_ibnl_clients();
	if (ret) {
1159 1160 1161 1162
		pr_warn("Couldn't register ibnl clients\n");
		goto err_sa;
	}

1163 1164 1165 1166 1167 1168
	ret = register_lsm_notifier(&ibdev_lsm_nb);
	if (ret) {
		pr_warn("Couldn't register LSM notifier. ret %d\n", ret);
		goto err_ibnl_clients;
	}

1169
	ib_cache_setup();
L
Linus Torvalds 已提交
1170

1171 1172
	return 0;

1173 1174
err_ibnl_clients:
	ib_remove_ibnl_clients();
1175 1176
err_sa:
	ib_sa_cleanup();
1177 1178
err_mad:
	ib_mad_cleanup();
1179 1180
err_addr:
	addr_cleanup();
1181 1182
err_ibnl:
	ibnl_cleanup();
1183
err_sysfs:
1184
	class_unregister(&ib_class);
1185 1186
err_comp:
	destroy_workqueue(ib_comp_wq);
1187 1188
err:
	destroy_workqueue(ib_wq);
L
Linus Torvalds 已提交
1189 1190 1191 1192 1193
	return ret;
}

static void __exit ib_core_cleanup(void)
{
1194
	unregister_lsm_notifier(&ibdev_lsm_nb);
L
Linus Torvalds 已提交
1195
	ib_cache_cleanup();
1196
	ib_remove_ibnl_clients();
1197
	ib_sa_cleanup();
1198
	ib_mad_cleanup();
1199
	addr_cleanup();
R
Roland Dreier 已提交
1200
	ibnl_cleanup();
1201
	class_unregister(&ib_class);
1202
	destroy_workqueue(ib_comp_wq);
1203
	/* Make sure that any pending umem accounting work is done. */
T
Tejun Heo 已提交
1204
	destroy_workqueue(ib_wq);
L
Linus Torvalds 已提交
1205 1206 1207 1208
}

module_init(ib_core_init);
module_exit(ib_core_cleanup);