ib_srp.c 54.6 KB
Newer Older
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
/*
 * Copyright (c) 2005 Cisco Systems.  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/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/string.h>
#include <linux/parser.h>
#include <linux/random.h>
40
#include <linux/jiffies.h>
41 42 43 44 45 46 47

#include <asm/atomic.h>

#include <scsi/scsi.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_dbg.h>
#include <scsi/srp.h>
48
#include <scsi/scsi_transport_srp.h>
49 50 51 52 53 54 55 56 57 58 59 60 61

#include "ib_srp.h"

#define DRV_NAME	"ib_srp"
#define PFX		DRV_NAME ": "
#define DRV_VERSION	"0.2"
#define DRV_RELDATE	"November 1, 2005"

MODULE_AUTHOR("Roland Dreier");
MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol initiator "
		   "v" DRV_VERSION " (" DRV_RELDATE ")");
MODULE_LICENSE("Dual BSD/GPL");

62 63 64 65 66
static int srp_sg_tablesize = SRP_DEF_SG_TABLESIZE;
static int srp_max_iu_len;

module_param(srp_sg_tablesize, int, 0444);
MODULE_PARM_DESC(srp_sg_tablesize,
67
		 "Max number of gather/scatter entries per I/O (default is 12, max 255)");
68

69 70 71 72 73 74
static int topspin_workarounds = 1;

module_param(topspin_workarounds, int, 0444);
MODULE_PARM_DESC(topspin_workarounds,
		 "Enable workarounds for Topspin/Cisco SRP target bugs if != 0");

75 76 77 78 79 80
static int mellanox_workarounds = 1;

module_param(mellanox_workarounds, int, 0444);
MODULE_PARM_DESC(mellanox_workarounds,
		 "Enable workarounds for Mellanox SRP target bugs if != 0");

81 82
static void srp_add_one(struct ib_device *device);
static void srp_remove_one(struct ib_device *device);
83 84
static void srp_recv_completion(struct ib_cq *cq, void *target_ptr);
static void srp_send_completion(struct ib_cq *cq, void *target_ptr);
85 86
static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event);

87 88
static struct scsi_transport_template *ib_srp_transport_template;

89 90 91 92 93 94
static struct ib_client srp_client = {
	.name   = "srp",
	.add    = srp_add_one,
	.remove = srp_remove_one
};

95 96
static struct ib_sa_client srp_sa_client;

97 98 99 100 101 102 103 104 105 106
static inline struct srp_target_port *host_to_target(struct Scsi_Host *host)
{
	return (struct srp_target_port *) host->hostdata;
}

static const char *srp_target_info(struct Scsi_Host *host)
{
	return host_to_target(host)->target_name;
}

107 108 109
static int srp_target_is_topspin(struct srp_target_port *target)
{
	static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad };
110
	static const u8 cisco_oui[3]   = { 0x00, 0x1b, 0x0d };
111 112

	return topspin_workarounds &&
113 114
		(!memcmp(&target->ioc_guid, topspin_oui, sizeof topspin_oui) ||
		 !memcmp(&target->ioc_guid, cisco_oui, sizeof cisco_oui));
115 116 117 118 119 120 121 122 123 124
}

static int srp_target_is_mellanox(struct srp_target_port *target)
{
	static const u8 mellanox_oui[3] = { 0x00, 0x02, 0xc9 };

	return mellanox_workarounds &&
		!memcmp(&target->ioc_guid, mellanox_oui, sizeof mellanox_oui);
}

125 126 127 128 129 130 131 132 133 134 135 136 137 138
static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size,
				   gfp_t gfp_mask,
				   enum dma_data_direction direction)
{
	struct srp_iu *iu;

	iu = kmalloc(sizeof *iu, gfp_mask);
	if (!iu)
		goto out;

	iu->buf = kzalloc(size, gfp_mask);
	if (!iu->buf)
		goto out_free_iu;

139 140 141
	iu->dma = ib_dma_map_single(host->srp_dev->dev, iu->buf, size,
				    direction);
	if (ib_dma_mapping_error(host->srp_dev->dev, iu->dma))
142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161
		goto out_free_buf;

	iu->size      = size;
	iu->direction = direction;

	return iu;

out_free_buf:
	kfree(iu->buf);
out_free_iu:
	kfree(iu);
out:
	return NULL;
}

static void srp_free_iu(struct srp_host *host, struct srp_iu *iu)
{
	if (!iu)
		return;

162 163
	ib_dma_unmap_single(host->srp_dev->dev, iu->dma, iu->size,
			    iu->direction);
164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182
	kfree(iu->buf);
	kfree(iu);
}

static void srp_qp_event(struct ib_event *event, void *context)
{
	printk(KERN_ERR PFX "QP event %d\n", event->event);
}

static int srp_init_qp(struct srp_target_port *target,
		       struct ib_qp *qp)
{
	struct ib_qp_attr *attr;
	int ret;

	attr = kmalloc(sizeof *attr, GFP_KERNEL);
	if (!attr)
		return -ENOMEM;

183 184 185 186
	ret = ib_find_pkey(target->srp_host->srp_dev->dev,
			   target->srp_host->port,
			   be16_to_cpu(target->path.pkey),
			   &attr->pkey_index);
187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205
	if (ret)
		goto out;

	attr->qp_state        = IB_QPS_INIT;
	attr->qp_access_flags = (IB_ACCESS_REMOTE_READ |
				    IB_ACCESS_REMOTE_WRITE);
	attr->port_num        = target->srp_host->port;

	ret = ib_modify_qp(qp, attr,
			   IB_QP_STATE		|
			   IB_QP_PKEY_INDEX	|
			   IB_QP_ACCESS_FLAGS	|
			   IB_QP_PORT);

out:
	kfree(attr);
	return ret;
}

D
David Dillow 已提交
206 207 208 209
static int srp_new_cm_id(struct srp_target_port *target)
{
	struct ib_cm_id *new_cm_id;

210
	new_cm_id = ib_create_cm_id(target->srp_host->srp_dev->dev,
D
David Dillow 已提交
211 212 213 214 215 216 217 218 219 220 221
				    srp_cm_handler, target);
	if (IS_ERR(new_cm_id))
		return PTR_ERR(new_cm_id);

	if (target->cm_id)
		ib_destroy_cm_id(target->cm_id);
	target->cm_id = new_cm_id;

	return 0;
}

222 223 224 225 226 227 228 229 230
static int srp_create_target_ib(struct srp_target_port *target)
{
	struct ib_qp_init_attr *init_attr;
	int ret;

	init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL);
	if (!init_attr)
		return -ENOMEM;

231 232 233 234
	target->recv_cq = ib_create_cq(target->srp_host->srp_dev->dev,
				       srp_recv_completion, NULL, target, SRP_RQ_SIZE, 0);
	if (IS_ERR(target->recv_cq)) {
		ret = PTR_ERR(target->recv_cq);
235
		goto err;
236 237
	}

238 239 240 241
	target->send_cq = ib_create_cq(target->srp_host->srp_dev->dev,
				       srp_send_completion, NULL, target, SRP_SQ_SIZE, 0);
	if (IS_ERR(target->send_cq)) {
		ret = PTR_ERR(target->send_cq);
242
		goto err_recv_cq;
243 244 245
	}

	ib_req_notify_cq(target->recv_cq, IB_CQ_NEXT_COMP);
246 247 248 249 250 251 252 253

	init_attr->event_handler       = srp_qp_event;
	init_attr->cap.max_send_wr     = SRP_SQ_SIZE;
	init_attr->cap.max_recv_wr     = SRP_RQ_SIZE;
	init_attr->cap.max_recv_sge    = 1;
	init_attr->cap.max_send_sge    = 1;
	init_attr->sq_sig_type         = IB_SIGNAL_ALL_WR;
	init_attr->qp_type             = IB_QPT_RC;
254 255
	init_attr->send_cq             = target->send_cq;
	init_attr->recv_cq             = target->recv_cq;
256

257
	target->qp = ib_create_qp(target->srp_host->srp_dev->pd, init_attr);
258 259
	if (IS_ERR(target->qp)) {
		ret = PTR_ERR(target->qp);
260
		goto err_send_cq;
261 262 263
	}

	ret = srp_init_qp(target, target->qp);
264 265
	if (ret)
		goto err_qp;
266

267 268 269 270 271 272 273 274 275 276 277 278 279
	kfree(init_attr);
	return 0;

err_qp:
	ib_destroy_qp(target->qp);

err_send_cq:
	ib_destroy_cq(target->send_cq);

err_recv_cq:
	ib_destroy_cq(target->recv_cq);

err:
280 281 282 283 284 285 286 287 288
	kfree(init_attr);
	return ret;
}

static void srp_free_target_ib(struct srp_target_port *target)
{
	int i;

	ib_destroy_qp(target->qp);
289 290
	ib_destroy_cq(target->send_cq);
	ib_destroy_cq(target->recv_cq);
291 292 293 294 295 296 297 298 299 300 301 302 303 304 305

	for (i = 0; i < SRP_RQ_SIZE; ++i)
		srp_free_iu(target->srp_host, target->rx_ring[i]);
	for (i = 0; i < SRP_SQ_SIZE + 1; ++i)
		srp_free_iu(target->srp_host, target->tx_ring[i]);
}

static void srp_path_rec_completion(int status,
				    struct ib_sa_path_rec *pathrec,
				    void *target_ptr)
{
	struct srp_target_port *target = target_ptr;

	target->status = status;
	if (status)
306 307
		shost_printk(KERN_ERR, target->scsi_host,
			     PFX "Got failed path rec status %d\n", status);
308 309 310 311 312 313 314 315 316 317 318
	else
		target->path = *pathrec;
	complete(&target->done);
}

static int srp_lookup_path(struct srp_target_port *target)
{
	target->path.numb_path = 1;

	init_completion(&target->done);

319
	target->path_query_id = ib_sa_path_rec_get(&srp_sa_client,
320
						   target->srp_host->srp_dev->dev,
321 322
						   target->srp_host->port,
						   &target->path,
323
						   IB_SA_PATH_REC_SERVICE_ID	|
324 325 326 327 328 329 330 331 332 333 334 335 336 337
						   IB_SA_PATH_REC_DGID		|
						   IB_SA_PATH_REC_SGID		|
						   IB_SA_PATH_REC_NUMB_PATH	|
						   IB_SA_PATH_REC_PKEY,
						   SRP_PATH_REC_TIMEOUT_MS,
						   GFP_KERNEL,
						   srp_path_rec_completion,
						   target, &target->path_query);
	if (target->path_query_id < 0)
		return target->path_query_id;

	wait_for_completion(&target->done);

	if (target->status < 0)
338 339
		shost_printk(KERN_WARNING, target->scsi_host,
			     PFX "Path record query failed\n");
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

	return target->status;
}

static int srp_send_req(struct srp_target_port *target)
{
	struct {
		struct ib_cm_req_param param;
		struct srp_login_req   priv;
	} *req = NULL;
	int status;

	req = kzalloc(sizeof *req, GFP_KERNEL);
	if (!req)
		return -ENOMEM;

	req->param.primary_path 	      = &target->path;
	req->param.alternate_path 	      = NULL;
	req->param.service_id 		      = target->service_id;
	req->param.qp_num 		      = target->qp->qp_num;
	req->param.qp_type 		      = target->qp->qp_type;
	req->param.private_data 	      = &req->priv;
	req->param.private_data_len 	      = sizeof req->priv;
	req->param.flow_control 	      = 1;

	get_random_bytes(&req->param.starting_psn, 4);
	req->param.starting_psn 	     &= 0xffffff;

	/*
	 * Pick some arbitrary defaults here; we could make these
	 * module parameters if anyone cared about setting them.
	 */
	req->param.responder_resources	      = 4;
	req->param.remote_cm_response_timeout = 20;
	req->param.local_cm_response_timeout  = 20;
	req->param.retry_count 		      = 7;
	req->param.rnr_retry_count 	      = 7;
	req->param.max_cm_retries 	      = 15;

	req->priv.opcode     	= SRP_LOGIN_REQ;
	req->priv.tag        	= 0;
381
	req->priv.req_it_iu_len = cpu_to_be32(srp_max_iu_len);
382 383
	req->priv.req_buf_fmt 	= cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
					      SRP_BUF_FORMAT_INDIRECT);
384
	/*
R
Roland Dreier 已提交
385
	 * In the published SRP specification (draft rev. 16a), the
386 387 388 389 390 391 392 393 394
	 * port identifier format is 8 bytes of ID extension followed
	 * by 8 bytes of GUID.  Older drafts put the two halves in the
	 * opposite order, so that the GUID comes first.
	 *
	 * Targets conforming to these obsolete drafts can be
	 * recognized by the I/O Class they report.
	 */
	if (target->io_class == SRP_REV10_IB_IO_CLASS) {
		memcpy(req->priv.initiator_port_id,
395
		       &target->path.sgid.global.interface_id, 8);
396
		memcpy(req->priv.initiator_port_id + 8,
397
		       &target->initiator_ext, 8);
398 399 400 401
		memcpy(req->priv.target_port_id,     &target->ioc_guid, 8);
		memcpy(req->priv.target_port_id + 8, &target->id_ext, 8);
	} else {
		memcpy(req->priv.initiator_port_id,
402 403 404
		       &target->initiator_ext, 8);
		memcpy(req->priv.initiator_port_id + 8,
		       &target->path.sgid.global.interface_id, 8);
405 406 407 408
		memcpy(req->priv.target_port_id,     &target->id_ext, 8);
		memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8);
	}

409 410
	/*
	 * Topspin/Cisco SRP targets will reject our login unless we
411 412
	 * zero out the first 8 bytes of our initiator port ID and set
	 * the second 8 bytes to the local node GUID.
413
	 */
414
	if (srp_target_is_topspin(target)) {
415 416 417 418
		shost_printk(KERN_DEBUG, target->scsi_host,
			     PFX "Topspin/Cisco initiator port ID workaround "
			     "activated for target GUID %016llx\n",
			     (unsigned long long) be64_to_cpu(target->ioc_guid));
419
		memset(req->priv.initiator_port_id, 0, 8);
420
		memcpy(req->priv.initiator_port_id + 8,
421
		       &target->srp_host->srp_dev->dev->node_guid, 8);
422 423 424 425 426 427 428 429 430 431 432 433 434 435
	}

	status = ib_send_cm_req(target->cm_id, &req->param);

	kfree(req);

	return status;
}

static void srp_disconnect_target(struct srp_target_port *target)
{
	/* XXX should send SRP_I_LOGOUT request */

	init_completion(&target->done);
436
	if (ib_send_cm_dreq(target->cm_id, NULL, 0)) {
437 438
		shost_printk(KERN_DEBUG, target->scsi_host,
			     PFX "Sending CM DREQ failed\n");
439 440
		return;
	}
441 442 443
	wait_for_completion(&target->done);
}

D
David Howells 已提交
444
static void srp_remove_work(struct work_struct *work)
445
{
D
David Howells 已提交
446 447
	struct srp_target_port *target =
		container_of(work, struct srp_target_port, work);
448 449 450 451 452 453 454 455 456

	spin_lock_irq(target->scsi_host->host_lock);
	if (target->state != SRP_TARGET_DEAD) {
		spin_unlock_irq(target->scsi_host->host_lock);
		return;
	}
	target->state = SRP_TARGET_REMOVED;
	spin_unlock_irq(target->scsi_host->host_lock);

457
	spin_lock(&target->srp_host->target_lock);
458
	list_del(&target->list);
459
	spin_unlock(&target->srp_host->target_lock);
460

461
	srp_remove_host(target->scsi_host);
462 463 464 465 466 467 468 469
	scsi_remove_host(target->scsi_host);
	ib_destroy_cm_id(target->cm_id);
	srp_free_target_ib(target);
	scsi_host_put(target->scsi_host);
}

static int srp_connect_target(struct srp_target_port *target)
{
D
David Dillow 已提交
470
	int retries = 3;
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
	int ret;

	ret = srp_lookup_path(target);
	if (ret)
		return ret;

	while (1) {
		init_completion(&target->done);
		ret = srp_send_req(target);
		if (ret)
			return ret;
		wait_for_completion(&target->done);

		/*
		 * The CM event handling code will set status to
		 * SRP_PORT_REDIRECT if we get a port redirect REJ
		 * back, or SRP_DLID_REDIRECT if we get a lid/qp
		 * redirect REJ back.
		 */
		switch (target->status) {
		case 0:
			return 0;

		case SRP_PORT_REDIRECT:
			ret = srp_lookup_path(target);
			if (ret)
				return ret;
			break;

		case SRP_DLID_REDIRECT:
			break;

D
David Dillow 已提交
503 504 505 506 507 508 509 510 511 512 513 514 515 516 517
		case SRP_STALE_CONN:
			/* Our current CM id was stale, and is now in timewait.
			 * Try to reconnect with a new one.
			 */
			if (!retries-- || srp_new_cm_id(target)) {
				shost_printk(KERN_ERR, target->scsi_host, PFX
					     "giving up on stale connection\n");
				target->status = -ECONNRESET;
				return target->status;
			}

			shost_printk(KERN_ERR, target->scsi_host, PFX
				     "retrying stale connection\n");
			break;

518 519 520 521 522 523
		default:
			return target->status;
		}
	}
}

524 525 526 527
static void srp_unmap_data(struct scsi_cmnd *scmnd,
			   struct srp_target_port *target,
			   struct srp_request *req)
{
528
	if (!scsi_sglist(scmnd) ||
529 530 531 532
	    (scmnd->sc_data_direction != DMA_TO_DEVICE &&
	     scmnd->sc_data_direction != DMA_FROM_DEVICE))
		return;

533 534 535 536 537
	if (req->fmr) {
		ib_fmr_pool_unmap(req->fmr);
		req->fmr = NULL;
	}

538
	ib_dma_unmap_sg(target->srp_host->srp_dev->dev, scsi_sglist(scmnd),
539
			scsi_sg_count(scmnd), scmnd->sc_data_direction);
540 541
}

542 543 544 545 546 547 548 549 550 551 552 553 554
static void srp_remove_req(struct srp_target_port *target, struct srp_request *req)
{
	srp_unmap_data(req->scmnd, target, req);
	list_move_tail(&req->list, &target->free_reqs);
}

static void srp_reset_req(struct srp_target_port *target, struct srp_request *req)
{
	req->scmnd->result = DID_RESET << 16;
	req->scmnd->scsi_done(req->scmnd);
	srp_remove_req(target, req);
}

555 556 557
static int srp_reconnect_target(struct srp_target_port *target)
{
	struct ib_qp_attr qp_attr;
558
	struct srp_request *req, *tmp;
559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574
	struct ib_wc wc;
	int ret;

	spin_lock_irq(target->scsi_host->host_lock);
	if (target->state != SRP_TARGET_LIVE) {
		spin_unlock_irq(target->scsi_host->host_lock);
		return -EAGAIN;
	}
	target->state = SRP_TARGET_CONNECTING;
	spin_unlock_irq(target->scsi_host->host_lock);

	srp_disconnect_target(target);
	/*
	 * Now get a new local CM ID so that we avoid confusing the
	 * target in case things are really fouled up.
	 */
D
David Dillow 已提交
575 576
	ret = srp_new_cm_id(target);
	if (ret)
577 578 579 580 581 582 583 584 585 586 587
		goto err;

	qp_attr.qp_state = IB_QPS_RESET;
	ret = ib_modify_qp(target->qp, &qp_attr, IB_QP_STATE);
	if (ret)
		goto err;

	ret = srp_init_qp(target, target->qp);
	if (ret)
		goto err;

588 589 590
	while (ib_poll_cq(target->recv_cq, 1, &wc) > 0)
		; /* nothing */
	while (ib_poll_cq(target->send_cq, 1, &wc) > 0)
591 592
		; /* nothing */

593
	spin_lock_irq(target->scsi_host->host_lock);
594 595
	list_for_each_entry_safe(req, tmp, &target->req_queue, list)
		srp_reset_req(target, req);
596
	spin_unlock_irq(target->scsi_host->host_lock);
597 598 599 600 601

	target->rx_head	 = 0;
	target->tx_head	 = 0;
	target->tx_tail  = 0;

602
	target->qp_in_error = 0;
603 604 605 606 607 608 609 610 611 612 613 614 615 616 617
	ret = srp_connect_target(target);
	if (ret)
		goto err;

	spin_lock_irq(target->scsi_host->host_lock);
	if (target->state == SRP_TARGET_CONNECTING) {
		ret = 0;
		target->state = SRP_TARGET_LIVE;
	} else
		ret = -EAGAIN;
	spin_unlock_irq(target->scsi_host->host_lock);

	return ret;

err:
618 619
	shost_printk(KERN_ERR, target->scsi_host,
		     PFX "reconnect failed (%d), removing target port.\n", ret);
620 621 622 623 624 625 626 627 628 629

	/*
	 * We couldn't reconnect, so kill our target port off.
	 * However, we have to defer the real removal because we might
	 * be in the context of the SCSI error handler now, which
	 * would deadlock if we call scsi_remove_host().
	 */
	spin_lock_irq(target->scsi_host->host_lock);
	if (target->state == SRP_TARGET_CONNECTING) {
		target->state = SRP_TARGET_DEAD;
D
David Howells 已提交
630
		INIT_WORK(&target->work, srp_remove_work);
631 632 633 634 635 636 637
		schedule_work(&target->work);
	}
	spin_unlock_irq(target->scsi_host->host_lock);

	return ret;
}

638
static int srp_map_fmr(struct srp_target_port *target, struct scatterlist *scat,
639 640 641 642 643 644 645 646 647
		       int sg_cnt, struct srp_request *req,
		       struct srp_direct_buf *buf)
{
	u64 io_addr = 0;
	u64 *dma_pages;
	u32 len;
	int page_cnt;
	int i, j;
	int ret;
648
	struct srp_device *dev = target->srp_host->srp_dev;
649
	struct ib_device *ibdev = dev->dev;
650
	struct scatterlist *sg;
651 652 653 654

	if (!dev->fmr_pool)
		return -ENODEV;

655 656
	if (srp_target_is_mellanox(target) &&
	    (ib_sg_dma_address(ibdev, &scat[0]) & ~dev->fmr_page_mask))
657 658
		return -EINVAL;

659
	len = page_cnt = 0;
660 661
	scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) {
		unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
662

663
		if (ib_sg_dma_address(ibdev, sg) & ~dev->fmr_page_mask) {
664 665 666 667 668
			if (i > 0)
				return -EINVAL;
			else
				++page_cnt;
		}
669
		if ((ib_sg_dma_address(ibdev, sg) + dma_len) &
670 671 672 673 674 675 676
		    ~dev->fmr_page_mask) {
			if (i < sg_cnt - 1)
				return -EINVAL;
			else
				++page_cnt;
		}

677
		len += dma_len;
678 679 680 681 682 683 684 685 686 687 688
	}

	page_cnt += len >> dev->fmr_page_shift;
	if (page_cnt > SRP_FMR_SIZE)
		return -ENOMEM;

	dma_pages = kmalloc(sizeof (u64) * page_cnt, GFP_ATOMIC);
	if (!dma_pages)
		return -ENOMEM;

	page_cnt = 0;
689 690
	scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) {
		unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
691 692

		for (j = 0; j < dma_len; j += dev->fmr_page_size)
693
			dma_pages[page_cnt++] =
694
				(ib_sg_dma_address(ibdev, sg) &
695 696
				 dev->fmr_page_mask) + j;
	}
697 698

	req->fmr = ib_fmr_pool_map_phys(dev->fmr_pool,
699
					dma_pages, page_cnt, io_addr);
700 701
	if (IS_ERR(req->fmr)) {
		ret = PTR_ERR(req->fmr);
V
Vu Pham 已提交
702
		req->fmr = NULL;
703 704 705
		goto out;
	}

706 707
	buf->va  = cpu_to_be64(ib_sg_dma_address(ibdev, &scat[0]) &
			       ~dev->fmr_page_mask);
708 709 710 711 712 713 714 715 716 717 718
	buf->key = cpu_to_be32(req->fmr->fmr->rkey);
	buf->len = cpu_to_be32(len);

	ret = 0;

out:
	kfree(dma_pages);

	return ret;
}

719 720 721
static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
			struct srp_request *req)
{
722
	struct scatterlist *scat;
723
	struct srp_cmd *cmd = req->cmd->buf;
724
	int len, nents, count;
725
	u8 fmt = SRP_DATA_DESC_DIRECT;
726 727
	struct srp_device *dev;
	struct ib_device *ibdev;
728

729
	if (!scsi_sglist(scmnd) || scmnd->sc_data_direction == DMA_NONE)
730 731 732 733
		return sizeof (struct srp_cmd);

	if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
	    scmnd->sc_data_direction != DMA_TO_DEVICE) {
734 735 736
		shost_printk(KERN_WARNING, target->scsi_host,
			     PFX "Unhandled data direction %d\n",
			     scmnd->sc_data_direction);
737 738 739
		return -EINVAL;
	}

740 741
	nents = scsi_sg_count(scmnd);
	scat  = scsi_sglist(scmnd);
742

743
	dev = target->srp_host->srp_dev;
744 745 746
	ibdev = dev->dev;

	count = ib_dma_map_sg(ibdev, scat, nents, scmnd->sc_data_direction);
747 748 749

	fmt = SRP_DATA_DESC_DIRECT;
	len = sizeof (struct srp_cmd) +	sizeof (struct srp_direct_buf);
750

751
	if (count == 1) {
752 753 754 755 756 757
		/*
		 * The midlayer only generated a single gather/scatter
		 * entry, or DMA mapping coalesced everything to a
		 * single entry.  So a direct descriptor along with
		 * the DMA MR suffices.
		 */
758
		struct srp_direct_buf *buf = (void *) cmd->add_data;
759

760 761 762
		buf->va  = cpu_to_be64(ib_sg_dma_address(ibdev, scat));
		buf->key = cpu_to_be32(dev->mr->rkey);
		buf->len = cpu_to_be32(ib_sg_dma_len(ibdev, scat));
763
	} else if (srp_map_fmr(target, scat, count, req,
764 765 766 767 768 769
			       (void *) cmd->add_data)) {
		/*
		 * FMR mapping failed, and the scatterlist has more
		 * than one entry.  Generate an indirect memory
		 * descriptor.
		 */
770
		struct srp_indirect_buf *buf = (void *) cmd->add_data;
771
		struct scatterlist *sg;
772
		u32 datalen = 0;
773
		int i;
774

775
		fmt = SRP_DATA_DESC_INDIRECT;
776 777 778 779
		len = sizeof (struct srp_cmd) +
			sizeof (struct srp_indirect_buf) +
			count * sizeof (struct srp_direct_buf);

780 781
		scsi_for_each_sg(scmnd, sg, count, i) {
			unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
782

783
			buf->desc_list[i].va  =
784
				cpu_to_be64(ib_sg_dma_address(ibdev, sg));
785
			buf->desc_list[i].key =
786 787 788
				cpu_to_be32(dev->mr->rkey);
			buf->desc_list[i].len = cpu_to_be32(dma_len);
			datalen += dma_len;
789
		}
790

791 792 793 794 795
		if (scmnd->sc_data_direction == DMA_TO_DEVICE)
			cmd->data_out_desc_cnt = count;
		else
			cmd->data_in_desc_cnt = count;

796 797
		buf->table_desc.va  =
			cpu_to_be64(req->cmd->dma + sizeof *cmd + sizeof *buf);
798
		buf->table_desc.key =
799
			cpu_to_be32(target->srp_host->srp_dev->mr->rkey);
800 801 802 803
		buf->table_desc.len =
			cpu_to_be32(count * sizeof (struct srp_direct_buf));

		buf->len = cpu_to_be32(datalen);
804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835
	}

	if (scmnd->sc_data_direction == DMA_TO_DEVICE)
		cmd->buf_fmt = fmt << 4;
	else
		cmd->buf_fmt = fmt;

	return len;
}

static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
{
	struct srp_request *req;
	struct scsi_cmnd *scmnd;
	unsigned long flags;
	s32 delta;

	delta = (s32) be32_to_cpu(rsp->req_lim_delta);

	spin_lock_irqsave(target->scsi_host->host_lock, flags);

	target->req_lim += delta;

	req = &target->req_ring[rsp->tag & ~SRP_TAG_TSK_MGMT];

	if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
		if (be32_to_cpu(rsp->resp_data_len) < 4)
			req->tsk_status = -1;
		else
			req->tsk_status = rsp->data[3];
		complete(&req->done);
	} else {
836
		scmnd = req->scmnd;
837
		if (!scmnd)
838 839 840
			shost_printk(KERN_ERR, target->scsi_host,
				     "Null scmnd for RSP w/tag %016llx\n",
				     (unsigned long long) rsp->tag);
841 842 843 844 845 846 847 848 849 850
		scmnd->result = rsp->status;

		if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
			memcpy(scmnd->sense_buffer, rsp->data +
			       be32_to_cpu(rsp->resp_data_len),
			       min_t(int, be32_to_cpu(rsp->sense_data_len),
				     SCSI_SENSE_BUFFERSIZE));
		}

		if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
851
			scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt));
852
		else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
853
			scsi_set_resid(scmnd, be32_to_cpu(rsp->data_in_res_cnt));
854 855 856 857 858

		if (!req->tsk_mgmt) {
			scmnd->host_scribble = (void *) -1L;
			scmnd->scsi_done(scmnd);

859
			srp_remove_req(target, req);
860 861 862 863 864 865 866 867 868
		} else
			req->cmd_done = 1;
	}

	spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
}

static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
{
869
	struct ib_device *dev;
870 871 872
	struct srp_iu *iu;
	u8 opcode;

873
	iu = target->rx_ring[wc->wr_id];
874

875
	dev = target->srp_host->srp_dev->dev;
876 877
	ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_ti_iu_len,
				   DMA_FROM_DEVICE);
878 879 880 881

	opcode = *(u8 *) iu->buf;

	if (0) {
882 883
		shost_printk(KERN_ERR, target->scsi_host,
			     PFX "recv completion, opcode 0x%02x\n", opcode);
B
Bart Van Assche 已提交
884 885
		print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 8, 1,
			       iu->buf, wc->byte_len, true);
886 887 888 889 890 891 892 893 894
	}

	switch (opcode) {
	case SRP_RSP:
		srp_process_rsp(target, iu->buf);
		break;

	case SRP_T_LOGOUT:
		/* XXX Handle target logout */
895 896
		shost_printk(KERN_WARNING, target->scsi_host,
			     PFX "Got target logout request\n");
897 898 899
		break;

	default:
900 901
		shost_printk(KERN_WARNING, target->scsi_host,
			     PFX "Unhandled SRP opcode 0x%02x\n", opcode);
902 903 904
		break;
	}

905 906
	ib_dma_sync_single_for_device(dev, iu->dma, target->max_ti_iu_len,
				      DMA_FROM_DEVICE);
907 908
}

909
static void srp_recv_completion(struct ib_cq *cq, void *target_ptr)
910 911 912 913 914 915 916
{
	struct srp_target_port *target = target_ptr;
	struct ib_wc wc;

	ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
	while (ib_poll_cq(cq, 1, &wc) > 0) {
		if (wc.status) {
917
			shost_printk(KERN_ERR, target->scsi_host,
918
				     PFX "failed receive status %d\n",
919
				     wc.status);
920
			target->qp_in_error = 1;
921 922 923
			break;
		}

924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942
		srp_handle_recv(target, &wc);
	}
}

static void srp_send_completion(struct ib_cq *cq, void *target_ptr)
{
	struct srp_target_port *target = target_ptr;
	struct ib_wc wc;

	while (ib_poll_cq(cq, 1, &wc) > 0) {
		if (wc.status) {
			shost_printk(KERN_ERR, target->scsi_host,
				     PFX "failed send status %d\n",
				     wc.status);
			target->qp_in_error = 1;
			break;
		}

		++target->tx_tail;
943 944 945 946 947 948 949 950 951 952 953 954
	}
}

static int __srp_post_recv(struct srp_target_port *target)
{
	struct srp_iu *iu;
	struct ib_sge list;
	struct ib_recv_wr wr, *bad_wr;
	unsigned int next;
	int ret;

	next 	 = target->rx_head & (SRP_RQ_SIZE - 1);
955
	wr.wr_id = next;
956 957 958 959
	iu 	 = target->rx_ring[next];

	list.addr   = iu->dma;
	list.length = iu->size;
960
	list.lkey   = target->srp_host->srp_dev->mr->lkey;
961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986

	wr.next     = NULL;
	wr.sg_list  = &list;
	wr.num_sge  = 1;

	ret = ib_post_recv(target->qp, &wr, &bad_wr);
	if (!ret)
		++target->rx_head;

	return ret;
}

static int srp_post_recv(struct srp_target_port *target)
{
	unsigned long flags;
	int ret;

	spin_lock_irqsave(target->scsi_host->host_lock, flags);
	ret = __srp_post_recv(target);
	spin_unlock_irqrestore(target->scsi_host->host_lock, flags);

	return ret;
}

/*
 * Must be called with target->scsi_host->host_lock held to protect
987 988
 * req_lim and tx_head.  Lock cannot be dropped between call here and
 * call to __srp_post_send().
989
 */
990 991
static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target,
					enum srp_request_type req_type)
992
{
993 994
	s32 min = (req_type == SRP_REQ_TASK_MGMT) ? 1 : 2;

995 996
	srp_send_completion(target->send_cq, target);

997 998 999
	if (target->tx_head - target->tx_tail >= SRP_SQ_SIZE)
		return NULL;

1000
	if (target->req_lim < min) {
1001
		++target->zero_req_lim;
1002 1003
		return NULL;
	}
1004

1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020
	return target->tx_ring[target->tx_head & SRP_SQ_SIZE];
}

/*
 * Must be called with target->scsi_host->host_lock held to protect
 * req_lim and tx_head.
 */
static int __srp_post_send(struct srp_target_port *target,
			   struct srp_iu *iu, int len)
{
	struct ib_sge list;
	struct ib_send_wr wr, *bad_wr;
	int ret = 0;

	list.addr   = iu->dma;
	list.length = len;
1021
	list.lkey   = target->srp_host->srp_dev->mr->lkey;
1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046

	wr.next       = NULL;
	wr.wr_id      = target->tx_head & SRP_SQ_SIZE;
	wr.sg_list    = &list;
	wr.num_sge    = 1;
	wr.opcode     = IB_WR_SEND;
	wr.send_flags = IB_SEND_SIGNALED;

	ret = ib_post_send(target->qp, &wr, &bad_wr);

	if (!ret) {
		++target->tx_head;
		--target->req_lim;
	}

	return ret;
}

static int srp_queuecommand(struct scsi_cmnd *scmnd,
			    void (*done)(struct scsi_cmnd *))
{
	struct srp_target_port *target = host_to_target(scmnd->device->host);
	struct srp_request *req;
	struct srp_iu *iu;
	struct srp_cmd *cmd;
1047
	struct ib_device *dev;
1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059
	int len;

	if (target->state == SRP_TARGET_CONNECTING)
		goto err;

	if (target->state == SRP_TARGET_DEAD ||
	    target->state == SRP_TARGET_REMOVED) {
		scmnd->result = DID_BAD_TARGET << 16;
		done(scmnd);
		return 0;
	}

1060
	iu = __srp_get_tx_iu(target, SRP_REQ_NORMAL);
1061 1062 1063
	if (!iu)
		goto err;

1064
	dev = target->srp_host->srp_dev->dev;
1065 1066
	ib_dma_sync_single_for_cpu(dev, iu->dma, srp_max_iu_len,
				   DMA_TO_DEVICE);
1067

1068
	req = list_entry(target->free_reqs.next, struct srp_request, list);
1069 1070 1071

	scmnd->scsi_done     = done;
	scmnd->result        = 0;
1072
	scmnd->host_scribble = (void *) (long) req->index;
1073 1074 1075 1076 1077 1078

	cmd = iu->buf;
	memset(cmd, 0, sizeof *cmd);

	cmd->opcode = SRP_CMD;
	cmd->lun    = cpu_to_be64((u64) scmnd->device->lun << 48);
1079
	cmd->tag    = req->index;
1080 1081 1082 1083 1084 1085 1086 1087 1088
	memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);

	req->scmnd    = scmnd;
	req->cmd      = iu;
	req->cmd_done = 0;
	req->tsk_mgmt = NULL;

	len = srp_map_data(scmnd, target, req);
	if (len < 0) {
1089 1090
		shost_printk(KERN_ERR, target->scsi_host,
			     PFX "Failed to map data\n");
1091 1092 1093 1094
		goto err;
	}

	if (__srp_post_recv(target)) {
1095
		shost_printk(KERN_ERR, target->scsi_host, PFX "Recv failed\n");
1096 1097 1098
		goto err_unmap;
	}

1099 1100
	ib_dma_sync_single_for_device(dev, iu->dma, srp_max_iu_len,
				      DMA_TO_DEVICE);
1101 1102

	if (__srp_post_send(target, iu, len)) {
1103
		shost_printk(KERN_ERR, target->scsi_host, PFX "Send failed\n");
1104 1105 1106
		goto err_unmap;
	}

1107
	list_move_tail(&req->list, &target->req_queue);
1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131

	return 0;

err_unmap:
	srp_unmap_data(scmnd, target, req);

err:
	return SCSI_MLQUEUE_HOST_BUSY;
}

static int srp_alloc_iu_bufs(struct srp_target_port *target)
{
	int i;

	for (i = 0; i < SRP_RQ_SIZE; ++i) {
		target->rx_ring[i] = srp_alloc_iu(target->srp_host,
						  target->max_ti_iu_len,
						  GFP_KERNEL, DMA_FROM_DEVICE);
		if (!target->rx_ring[i])
			goto err;
	}

	for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
		target->tx_ring[i] = srp_alloc_iu(target->srp_host,
1132
						  srp_max_iu_len,
1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157
						  GFP_KERNEL, DMA_TO_DEVICE);
		if (!target->tx_ring[i])
			goto err;
	}

	return 0;

err:
	for (i = 0; i < SRP_RQ_SIZE; ++i) {
		srp_free_iu(target->srp_host, target->rx_ring[i]);
		target->rx_ring[i] = NULL;
	}

	for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
		srp_free_iu(target->srp_host, target->tx_ring[i]);
		target->tx_ring[i] = NULL;
	}

	return -ENOMEM;
}

static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
			       struct ib_cm_event *event,
			       struct srp_target_port *target)
{
1158
	struct Scsi_Host *shost = target->scsi_host;
1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174
	struct ib_class_port_info *cpi;
	int opcode;

	switch (event->param.rej_rcvd.reason) {
	case IB_CM_REJ_PORT_CM_REDIRECT:
		cpi = event->param.rej_rcvd.ari;
		target->path.dlid = cpi->redirect_lid;
		target->path.pkey = cpi->redirect_pkey;
		cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
		memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);

		target->status = target->path.dlid ?
			SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
		break;

	case IB_CM_REJ_PORT_REDIRECT:
1175
		if (srp_target_is_topspin(target)) {
1176 1177 1178 1179 1180 1181 1182 1183
			/*
			 * Topspin/Cisco SRP gateways incorrectly send
			 * reject reason code 25 when they mean 24
			 * (port redirect).
			 */
			memcpy(target->path.dgid.raw,
			       event->param.rej_rcvd.ari, 16);

1184 1185 1186 1187
			shost_printk(KERN_DEBUG, shost,
				     PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
				     (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
				     (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
1188 1189 1190

			target->status = SRP_PORT_REDIRECT;
		} else {
1191 1192
			shost_printk(KERN_WARNING, shost,
				     "  REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
1193 1194 1195 1196 1197
			target->status = -ECONNRESET;
		}
		break;

	case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
1198 1199
		shost_printk(KERN_WARNING, shost,
			    "  REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
1200 1201 1202 1203 1204 1205 1206 1207 1208 1209
		target->status = -ECONNRESET;
		break;

	case IB_CM_REJ_CONSUMER_DEFINED:
		opcode = *(u8 *) event->private_data;
		if (opcode == SRP_LOGIN_REJ) {
			struct srp_login_rej *rej = event->private_data;
			u32 reason = be32_to_cpu(rej->reason);

			if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
1210 1211
				shost_printk(KERN_WARNING, shost,
					     PFX "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
1212
			else
1213 1214
				shost_printk(KERN_WARNING, shost,
					    PFX "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
1215
		} else
1216 1217 1218
			shost_printk(KERN_WARNING, shost,
				     "  REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
				     " opcode 0x%02x\n", opcode);
1219 1220 1221
		target->status = -ECONNRESET;
		break;

D
David Dillow 已提交
1222 1223 1224 1225 1226
	case IB_CM_REJ_STALE_CONN:
		shost_printk(KERN_WARNING, shost, "  REJ reason: stale connection\n");
		target->status = SRP_STALE_CONN;
		break;

1227
	default:
1228 1229
		shost_printk(KERN_WARNING, shost, "  REJ reason 0x%x\n",
			     event->param.rej_rcvd.reason);
1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243
		target->status = -ECONNRESET;
	}
}

static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
{
	struct srp_target_port *target = cm_id->context;
	struct ib_qp_attr *qp_attr = NULL;
	int attr_mask = 0;
	int comp = 0;
	int opcode = 0;

	switch (event->event) {
	case IB_CM_REQ_ERROR:
1244 1245
		shost_printk(KERN_DEBUG, target->scsi_host,
			     PFX "Sending CM REQ failed\n");
1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262
		comp = 1;
		target->status = -ECONNRESET;
		break;

	case IB_CM_REP_RECEIVED:
		comp = 1;
		opcode = *(u8 *) event->private_data;

		if (opcode == SRP_LOGIN_RSP) {
			struct srp_login_rsp *rsp = event->private_data;

			target->max_ti_iu_len = be32_to_cpu(rsp->max_ti_iu_len);
			target->req_lim       = be32_to_cpu(rsp->req_lim_delta);

			target->scsi_host->can_queue = min(target->req_lim,
							   target->scsi_host->can_queue);
		} else {
1263 1264
			shost_printk(KERN_WARNING, target->scsi_host,
				    PFX "Unhandled RSP opcode %#x\n", opcode);
1265 1266 1267 1268
			target->status = -ECONNRESET;
			break;
		}

V
Vu Pham 已提交
1269 1270 1271 1272 1273
		if (!target->rx_ring[0]) {
			target->status = srp_alloc_iu_bufs(target);
			if (target->status)
				break;
		}
1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309

		qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
		if (!qp_attr) {
			target->status = -ENOMEM;
			break;
		}

		qp_attr->qp_state = IB_QPS_RTR;
		target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
		if (target->status)
			break;

		target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
		if (target->status)
			break;

		target->status = srp_post_recv(target);
		if (target->status)
			break;

		qp_attr->qp_state = IB_QPS_RTS;
		target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
		if (target->status)
			break;

		target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
		if (target->status)
			break;

		target->status = ib_send_cm_rtu(cm_id, NULL, 0);
		if (target->status)
			break;

		break;

	case IB_CM_REJ_RECEIVED:
1310
		shost_printk(KERN_DEBUG, target->scsi_host, PFX "REJ received\n");
1311 1312 1313 1314 1315
		comp = 1;

		srp_cm_rej_handler(cm_id, event, target);
		break;

1316
	case IB_CM_DREQ_RECEIVED:
1317 1318
		shost_printk(KERN_WARNING, target->scsi_host,
			     PFX "DREQ received - connection closed\n");
1319
		if (ib_send_cm_drep(cm_id, NULL, 0))
1320 1321
			shost_printk(KERN_ERR, target->scsi_host,
				     PFX "Sending CM DREP failed\n");
1322 1323 1324
		break;

	case IB_CM_TIMEWAIT_EXIT:
1325 1326
		shost_printk(KERN_ERR, target->scsi_host,
			     PFX "connection closed\n");
1327 1328 1329 1330 1331

		comp = 1;
		target->status = 0;
		break;

1332 1333 1334 1335 1336
	case IB_CM_MRA_RECEIVED:
	case IB_CM_DREQ_ERROR:
	case IB_CM_DREP_RECEIVED:
		break;

1337
	default:
1338 1339
		shost_printk(KERN_WARNING, target->scsi_host,
			     PFX "Unhandled CM event %d\n", event->event);
1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350
		break;
	}

	if (comp)
		complete(&target->done);

	kfree(qp_attr);

	return 0;
}

1351 1352
static int srp_send_tsk_mgmt(struct srp_target_port *target,
			     struct srp_request *req, u8 func)
1353 1354 1355 1356 1357 1358
{
	struct srp_iu *iu;
	struct srp_tsk_mgmt *tsk_mgmt;

	spin_lock_irq(target->scsi_host->host_lock);

1359 1360
	if (target->state == SRP_TARGET_DEAD ||
	    target->state == SRP_TARGET_REMOVED) {
1361
		req->scmnd->result = DID_BAD_TARGET << 16;
1362 1363 1364
		goto out;
	}

1365 1366
	init_completion(&req->done);

1367
	iu = __srp_get_tx_iu(target, SRP_REQ_TASK_MGMT);
1368 1369 1370 1371 1372 1373 1374
	if (!iu)
		goto out;

	tsk_mgmt = iu->buf;
	memset(tsk_mgmt, 0, sizeof *tsk_mgmt);

	tsk_mgmt->opcode 	= SRP_TSK_MGMT;
1375 1376
	tsk_mgmt->lun 		= cpu_to_be64((u64) req->scmnd->device->lun << 48);
	tsk_mgmt->tag 		= req->index | SRP_TAG_TSK_MGMT;
1377
	tsk_mgmt->tsk_mgmt_func = func;
1378
	tsk_mgmt->task_tag 	= req->index;
1379 1380 1381 1382 1383 1384 1385

	if (__srp_post_send(target, iu, sizeof *tsk_mgmt))
		goto out;

	req->tsk_mgmt = iu;

	spin_unlock_irq(target->scsi_host->host_lock);
1386

1387 1388
	if (!wait_for_completion_timeout(&req->done,
					 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
1389
		return -1;
1390

1391
	return 0;
1392 1393 1394

out:
	spin_unlock_irq(target->scsi_host->host_lock);
1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407
	return -1;
}

static int srp_find_req(struct srp_target_port *target,
			struct scsi_cmnd *scmnd,
			struct srp_request **req)
{
	if (scmnd->host_scribble == (void *) -1L)
		return -1;

	*req = &target->req_ring[(long) scmnd->host_scribble];

	return 0;
1408 1409 1410 1411
}

static int srp_abort(struct scsi_cmnd *scmnd)
{
1412 1413 1414 1415
	struct srp_target_port *target = host_to_target(scmnd->device->host);
	struct srp_request *req;
	int ret = SUCCESS;

1416
	shost_printk(KERN_ERR, target->scsi_host, "SRP abort called\n");
1417

1418 1419
	if (target->qp_in_error)
		return FAILED;
1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438
	if (srp_find_req(target, scmnd, &req))
		return FAILED;
	if (srp_send_tsk_mgmt(target, req, SRP_TSK_ABORT_TASK))
		return FAILED;

	spin_lock_irq(target->scsi_host->host_lock);

	if (req->cmd_done) {
		srp_remove_req(target, req);
		scmnd->scsi_done(scmnd);
	} else if (!req->tsk_status) {
		srp_remove_req(target, req);
		scmnd->result = DID_ABORT << 16;
	} else
		ret = FAILED;

	spin_unlock_irq(target->scsi_host->host_lock);

	return ret;
1439 1440 1441 1442
}

static int srp_reset_device(struct scsi_cmnd *scmnd)
{
1443 1444 1445
	struct srp_target_port *target = host_to_target(scmnd->device->host);
	struct srp_request *req, *tmp;

1446
	shost_printk(KERN_ERR, target->scsi_host, "SRP reset_device called\n");
1447

1448 1449
	if (target->qp_in_error)
		return FAILED;
1450 1451 1452 1453 1454 1455 1456 1457 1458 1459
	if (srp_find_req(target, scmnd, &req))
		return FAILED;
	if (srp_send_tsk_mgmt(target, req, SRP_TSK_LUN_RESET))
		return FAILED;
	if (req->tsk_status)
		return FAILED;

	spin_lock_irq(target->scsi_host->host_lock);

	list_for_each_entry_safe(req, tmp, &target->req_queue, list)
1460 1461
		if (req->scmnd->device == scmnd->device)
			srp_reset_req(target, req);
1462 1463 1464 1465

	spin_unlock_irq(target->scsi_host->host_lock);

	return SUCCESS;
1466 1467 1468 1469 1470 1471 1472
}

static int srp_reset_host(struct scsi_cmnd *scmnd)
{
	struct srp_target_port *target = host_to_target(scmnd->device->host);
	int ret = FAILED;

1473
	shost_printk(KERN_ERR, target->scsi_host, PFX "SRP reset_host called\n");
1474 1475 1476 1477 1478 1479 1480

	if (!srp_reconnect_target(target))
		ret = SUCCESS;

	return ret;
}

1481 1482
static ssize_t show_id_ext(struct device *dev, struct device_attribute *attr,
			   char *buf)
1483
{
1484
	struct srp_target_port *target = host_to_target(class_to_shost(dev));
1485 1486 1487 1488 1489 1490 1491 1492 1493

	if (target->state == SRP_TARGET_DEAD ||
	    target->state == SRP_TARGET_REMOVED)
		return -ENODEV;

	return sprintf(buf, "0x%016llx\n",
		       (unsigned long long) be64_to_cpu(target->id_ext));
}

1494 1495
static ssize_t show_ioc_guid(struct device *dev, struct device_attribute *attr,
			     char *buf)
1496
{
1497
	struct srp_target_port *target = host_to_target(class_to_shost(dev));
1498 1499 1500 1501 1502 1503 1504 1505 1506

	if (target->state == SRP_TARGET_DEAD ||
	    target->state == SRP_TARGET_REMOVED)
		return -ENODEV;

	return sprintf(buf, "0x%016llx\n",
		       (unsigned long long) be64_to_cpu(target->ioc_guid));
}

1507 1508
static ssize_t show_service_id(struct device *dev,
			       struct device_attribute *attr, char *buf)
1509
{
1510
	struct srp_target_port *target = host_to_target(class_to_shost(dev));
1511 1512 1513 1514 1515 1516 1517 1518 1519

	if (target->state == SRP_TARGET_DEAD ||
	    target->state == SRP_TARGET_REMOVED)
		return -ENODEV;

	return sprintf(buf, "0x%016llx\n",
		       (unsigned long long) be64_to_cpu(target->service_id));
}

1520 1521
static ssize_t show_pkey(struct device *dev, struct device_attribute *attr,
			 char *buf)
1522
{
1523
	struct srp_target_port *target = host_to_target(class_to_shost(dev));
1524 1525 1526 1527 1528 1529 1530 1531

	if (target->state == SRP_TARGET_DEAD ||
	    target->state == SRP_TARGET_REMOVED)
		return -ENODEV;

	return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey));
}

1532 1533
static ssize_t show_dgid(struct device *dev, struct device_attribute *attr,
			 char *buf)
1534
{
1535
	struct srp_target_port *target = host_to_target(class_to_shost(dev));
1536 1537 1538 1539 1540

	if (target->state == SRP_TARGET_DEAD ||
	    target->state == SRP_TARGET_REMOVED)
		return -ENODEV;

H
Harvey Harrison 已提交
1541
	return sprintf(buf, "%pI6\n", target->path.dgid.raw);
1542 1543
}

1544 1545
static ssize_t show_orig_dgid(struct device *dev,
			      struct device_attribute *attr, char *buf)
1546
{
1547
	struct srp_target_port *target = host_to_target(class_to_shost(dev));
1548 1549 1550 1551 1552

	if (target->state == SRP_TARGET_DEAD ||
	    target->state == SRP_TARGET_REMOVED)
		return -ENODEV;

H
Harvey Harrison 已提交
1553
	return sprintf(buf, "%pI6\n", target->orig_dgid);
1554 1555
}

1556 1557
static ssize_t show_zero_req_lim(struct device *dev,
				 struct device_attribute *attr, char *buf)
1558
{
1559
	struct srp_target_port *target = host_to_target(class_to_shost(dev));
1560 1561 1562 1563 1564 1565 1566 1567

	if (target->state == SRP_TARGET_DEAD ||
	    target->state == SRP_TARGET_REMOVED)
		return -ENODEV;

	return sprintf(buf, "%d\n", target->zero_req_lim);
}

1568 1569
static ssize_t show_local_ib_port(struct device *dev,
				  struct device_attribute *attr, char *buf)
1570
{
1571
	struct srp_target_port *target = host_to_target(class_to_shost(dev));
1572 1573 1574 1575

	return sprintf(buf, "%d\n", target->srp_host->port);
}

1576 1577
static ssize_t show_local_ib_device(struct device *dev,
				    struct device_attribute *attr, char *buf)
1578
{
1579
	struct srp_target_port *target = host_to_target(class_to_shost(dev));
1580

1581
	return sprintf(buf, "%s\n", target->srp_host->srp_dev->dev->name);
1582 1583
}

1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603
static DEVICE_ATTR(id_ext,	    S_IRUGO, show_id_ext,	   NULL);
static DEVICE_ATTR(ioc_guid,	    S_IRUGO, show_ioc_guid,	   NULL);
static DEVICE_ATTR(service_id,	    S_IRUGO, show_service_id,	   NULL);
static DEVICE_ATTR(pkey,	    S_IRUGO, show_pkey,		   NULL);
static DEVICE_ATTR(dgid,	    S_IRUGO, show_dgid,		   NULL);
static DEVICE_ATTR(orig_dgid,	    S_IRUGO, show_orig_dgid,	   NULL);
static DEVICE_ATTR(zero_req_lim,    S_IRUGO, show_zero_req_lim,	   NULL);
static DEVICE_ATTR(local_ib_port,   S_IRUGO, show_local_ib_port,   NULL);
static DEVICE_ATTR(local_ib_device, S_IRUGO, show_local_ib_device, NULL);

static struct device_attribute *srp_host_attrs[] = {
	&dev_attr_id_ext,
	&dev_attr_ioc_guid,
	&dev_attr_service_id,
	&dev_attr_pkey,
	&dev_attr_dgid,
	&dev_attr_orig_dgid,
	&dev_attr_zero_req_lim,
	&dev_attr_local_ib_port,
	&dev_attr_local_ib_device,
1604 1605 1606
	NULL
};

1607 1608
static struct scsi_host_template srp_template = {
	.module				= THIS_MODULE,
R
Roland Dreier 已提交
1609 1610
	.name				= "InfiniBand SRP initiator",
	.proc_name			= DRV_NAME,
1611 1612 1613 1614 1615 1616 1617 1618
	.info				= srp_target_info,
	.queuecommand			= srp_queuecommand,
	.eh_abort_handler		= srp_abort,
	.eh_device_reset_handler	= srp_reset_device,
	.eh_host_reset_handler		= srp_reset_host,
	.can_queue			= SRP_SQ_SIZE,
	.this_id			= -1,
	.cmd_per_lun			= SRP_SQ_SIZE,
1619 1620
	.use_clustering			= ENABLE_CLUSTERING,
	.shost_attrs			= srp_host_attrs
1621 1622 1623 1624
};

static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
{
1625 1626 1627
	struct srp_rport_identifiers ids;
	struct srp_rport *rport;

1628 1629 1630
	sprintf(target->target_name, "SRP.T10:%016llX",
		 (unsigned long long) be64_to_cpu(target->id_ext));

1631
	if (scsi_add_host(target->scsi_host, host->srp_dev->dev->dma_device))
1632 1633
		return -ENODEV;

1634 1635
	memcpy(ids.port_id, &target->id_ext, 8);
	memcpy(ids.port_id + 8, &target->ioc_guid, 8);
1636
	ids.roles = SRP_RPORT_ROLE_TARGET;
1637 1638 1639 1640 1641 1642
	rport = srp_rport_add(target->scsi_host, &ids);
	if (IS_ERR(rport)) {
		scsi_remove_host(target->scsi_host);
		return PTR_ERR(rport);
	}

1643
	spin_lock(&host->target_lock);
1644
	list_add_tail(&target->list, &host->target_list);
1645
	spin_unlock(&host->target_lock);
1646 1647 1648 1649

	target->state = SRP_TARGET_LIVE;

	scsi_scan_target(&target->scsi_host->shost_gendev,
1650
			 0, target->scsi_id, SCAN_WILD_CARD, 0);
1651 1652 1653 1654

	return 0;
}

1655
static void srp_release_dev(struct device *dev)
1656 1657
{
	struct srp_host *host =
1658
		container_of(dev, struct srp_host, dev);
1659 1660 1661 1662 1663 1664

	complete(&host->released);
}

static struct class srp_class = {
	.name    = "infiniband_srp",
1665
	.dev_release = srp_release_dev
1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683
};

/*
 * Target ports are added by writing
 *
 *     id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
 *     pkey=<P_Key>,service_id=<service ID>
 *
 * to the add_target sysfs attribute.
 */
enum {
	SRP_OPT_ERR		= 0,
	SRP_OPT_ID_EXT		= 1 << 0,
	SRP_OPT_IOC_GUID	= 1 << 1,
	SRP_OPT_DGID		= 1 << 2,
	SRP_OPT_PKEY		= 1 << 3,
	SRP_OPT_SERVICE_ID	= 1 << 4,
	SRP_OPT_MAX_SECT	= 1 << 5,
1684
	SRP_OPT_MAX_CMD_PER_LUN	= 1 << 6,
1685
	SRP_OPT_IO_CLASS	= 1 << 7,
1686
	SRP_OPT_INITIATOR_EXT	= 1 << 8,
1687 1688 1689 1690 1691 1692 1693
	SRP_OPT_ALL		= (SRP_OPT_ID_EXT	|
				   SRP_OPT_IOC_GUID	|
				   SRP_OPT_DGID		|
				   SRP_OPT_PKEY		|
				   SRP_OPT_SERVICE_ID),
};

1694
static const match_table_t srp_opt_tokens = {
1695 1696 1697 1698 1699 1700 1701
	{ SRP_OPT_ID_EXT,		"id_ext=%s" 		},
	{ SRP_OPT_IOC_GUID,		"ioc_guid=%s" 		},
	{ SRP_OPT_DGID,			"dgid=%s" 		},
	{ SRP_OPT_PKEY,			"pkey=%x" 		},
	{ SRP_OPT_SERVICE_ID,		"service_id=%s"		},
	{ SRP_OPT_MAX_SECT,		"max_sect=%d" 		},
	{ SRP_OPT_MAX_CMD_PER_LUN,	"max_cmd_per_lun=%d" 	},
1702
	{ SRP_OPT_IO_CLASS,		"io_class=%x"		},
1703
	{ SRP_OPT_INITIATOR_EXT,	"initiator_ext=%s"	},
1704
	{ SRP_OPT_ERR,			NULL 			}
1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732
};

static int srp_parse_options(const char *buf, struct srp_target_port *target)
{
	char *options, *sep_opt;
	char *p;
	char dgid[3];
	substring_t args[MAX_OPT_ARGS];
	int opt_mask = 0;
	int token;
	int ret = -EINVAL;
	int i;

	options = kstrdup(buf, GFP_KERNEL);
	if (!options)
		return -ENOMEM;

	sep_opt = options;
	while ((p = strsep(&sep_opt, ",")) != NULL) {
		if (!*p)
			continue;

		token = match_token(p, srp_opt_tokens, args);
		opt_mask |= token;

		switch (token) {
		case SRP_OPT_ID_EXT:
			p = match_strdup(args);
1733 1734 1735 1736
			if (!p) {
				ret = -ENOMEM;
				goto out;
			}
1737 1738 1739 1740 1741 1742
			target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
			kfree(p);
			break;

		case SRP_OPT_IOC_GUID:
			p = match_strdup(args);
1743 1744 1745 1746
			if (!p) {
				ret = -ENOMEM;
				goto out;
			}
1747 1748 1749 1750 1751 1752
			target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
			kfree(p);
			break;

		case SRP_OPT_DGID:
			p = match_strdup(args);
1753 1754 1755 1756
			if (!p) {
				ret = -ENOMEM;
				goto out;
			}
1757 1758
			if (strlen(p) != 32) {
				printk(KERN_WARNING PFX "bad dest GID parameter '%s'\n", p);
1759
				kfree(p);
1760 1761 1762 1763 1764 1765 1766
				goto out;
			}

			for (i = 0; i < 16; ++i) {
				strlcpy(dgid, p + i * 2, 3);
				target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
			}
1767
			kfree(p);
1768
			memcpy(target->orig_dgid, target->path.dgid.raw, 16);
1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780
			break;

		case SRP_OPT_PKEY:
			if (match_hex(args, &token)) {
				printk(KERN_WARNING PFX "bad P_Key parameter '%s'\n", p);
				goto out;
			}
			target->path.pkey = cpu_to_be16(token);
			break;

		case SRP_OPT_SERVICE_ID:
			p = match_strdup(args);
1781 1782 1783 1784
			if (!p) {
				ret = -ENOMEM;
				goto out;
			}
1785
			target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
1786
			target->path.service_id = target->service_id;
1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797
			kfree(p);
			break;

		case SRP_OPT_MAX_SECT:
			if (match_int(args, &token)) {
				printk(KERN_WARNING PFX "bad max sect parameter '%s'\n", p);
				goto out;
			}
			target->scsi_host->max_sectors = token;
			break;

1798 1799 1800 1801 1802 1803 1804 1805
		case SRP_OPT_MAX_CMD_PER_LUN:
			if (match_int(args, &token)) {
				printk(KERN_WARNING PFX "bad max cmd_per_lun parameter '%s'\n", p);
				goto out;
			}
			target->scsi_host->cmd_per_lun = min(token, SRP_SQ_SIZE);
			break;

1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820
		case SRP_OPT_IO_CLASS:
			if (match_hex(args, &token)) {
				printk(KERN_WARNING PFX "bad  IO class parameter '%s' \n", p);
				goto out;
			}
			if (token != SRP_REV10_IB_IO_CLASS &&
			    token != SRP_REV16A_IB_IO_CLASS) {
				printk(KERN_WARNING PFX "unknown IO class parameter value"
				       " %x specified (use %x or %x).\n",
				       token, SRP_REV10_IB_IO_CLASS, SRP_REV16A_IB_IO_CLASS);
				goto out;
			}
			target->io_class = token;
			break;

1821 1822
		case SRP_OPT_INITIATOR_EXT:
			p = match_strdup(args);
1823 1824 1825 1826
			if (!p) {
				ret = -ENOMEM;
				goto out;
			}
1827 1828 1829 1830
			target->initiator_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
			kfree(p);
			break;

1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852
		default:
			printk(KERN_WARNING PFX "unknown parameter or missing value "
			       "'%s' in target creation request\n", p);
			goto out;
		}
	}

	if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
		ret = 0;
	else
		for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
			if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
			    !(srp_opt_tokens[i].token & opt_mask))
				printk(KERN_WARNING PFX "target creation request is "
				       "missing parameter '%s'\n",
				       srp_opt_tokens[i].pattern);

out:
	kfree(options);
	return ret;
}

1853 1854
static ssize_t srp_create_target(struct device *dev,
				 struct device_attribute *attr,
1855 1856 1857
				 const char *buf, size_t count)
{
	struct srp_host *host =
1858
		container_of(dev, struct srp_host, dev);
1859 1860 1861 1862 1863 1864 1865 1866 1867 1868
	struct Scsi_Host *target_host;
	struct srp_target_port *target;
	int ret;
	int i;

	target_host = scsi_host_alloc(&srp_template,
				      sizeof (struct srp_target_port));
	if (!target_host)
		return -ENOMEM;

1869
	target_host->transportt = ib_srp_transport_template;
A
Arne Redlich 已提交
1870 1871
	target_host->max_lun     = SRP_MAX_LUN;
	target_host->max_cmd_len = sizeof ((struct srp_cmd *) (void *) 0L)->cdb;
R
Roland Dreier 已提交
1872

1873 1874
	target = host_to_target(target_host);

1875
	target->io_class   = SRP_REV16A_IB_IO_CLASS;
1876 1877 1878
	target->scsi_host  = target_host;
	target->srp_host   = host;

1879
	INIT_LIST_HEAD(&target->free_reqs);
1880
	INIT_LIST_HEAD(&target->req_queue);
1881 1882 1883 1884
	for (i = 0; i < SRP_SQ_SIZE; ++i) {
		target->req_ring[i].index = i;
		list_add_tail(&target->req_ring[i].list, &target->free_reqs);
	}
1885 1886 1887 1888 1889

	ret = srp_parse_options(buf, target);
	if (ret)
		goto err;

1890
	ib_query_gid(host->srp_dev->dev, host->port, 0, &target->path.sgid);
1891

1892 1893
	shost_printk(KERN_DEBUG, target->scsi_host, PFX
		     "new target: id_ext %016llx ioc_guid %016llx pkey %04x "
H
Harvey Harrison 已提交
1894
		     "service_id %016llx dgid %pI6\n",
1895 1896 1897 1898
	       (unsigned long long) be64_to_cpu(target->id_ext),
	       (unsigned long long) be64_to_cpu(target->ioc_guid),
	       be16_to_cpu(target->path.pkey),
	       (unsigned long long) be64_to_cpu(target->service_id),
1899
	       target->path.dgid.raw);
1900 1901 1902 1903 1904

	ret = srp_create_target_ib(target);
	if (ret)
		goto err;

D
David Dillow 已提交
1905 1906
	ret = srp_new_cm_id(target);
	if (ret)
1907 1908
		goto err_free;

1909
	target->qp_in_error = 0;
1910 1911
	ret = srp_connect_target(target);
	if (ret) {
1912 1913
		shost_printk(KERN_ERR, target->scsi_host,
			     PFX "Connection failed\n");
1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937
		goto err_cm_id;
	}

	ret = srp_add_target(host, target);
	if (ret)
		goto err_disconnect;

	return count;

err_disconnect:
	srp_disconnect_target(target);

err_cm_id:
	ib_destroy_cm_id(target->cm_id);

err_free:
	srp_free_target_ib(target);

err:
	scsi_host_put(target_host);

	return ret;
}

1938
static DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
1939

1940 1941
static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
			  char *buf)
1942
{
1943
	struct srp_host *host = container_of(dev, struct srp_host, dev);
1944

1945
	return sprintf(buf, "%s\n", host->srp_dev->dev->name);
1946 1947
}

1948
static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1949

1950 1951
static ssize_t show_port(struct device *dev, struct device_attribute *attr,
			 char *buf)
1952
{
1953
	struct srp_host *host = container_of(dev, struct srp_host, dev);
1954 1955 1956 1957

	return sprintf(buf, "%d\n", host->port);
}

1958
static DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
1959

1960
static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
1961 1962 1963 1964 1965 1966 1967 1968
{
	struct srp_host *host;

	host = kzalloc(sizeof *host, GFP_KERNEL);
	if (!host)
		return NULL;

	INIT_LIST_HEAD(&host->target_list);
1969
	spin_lock_init(&host->target_lock);
1970
	init_completion(&host->released);
1971
	host->srp_dev = device;
1972 1973
	host->port = port;

1974 1975
	host->dev.class = &srp_class;
	host->dev.parent = device->dev->dma_device;
1976
	dev_set_name(&host->dev, "srp-%s-%d", device->dev->name, port);
1977

1978
	if (device_register(&host->dev))
1979
		goto free_host;
1980
	if (device_create_file(&host->dev, &dev_attr_add_target))
1981
		goto err_class;
1982
	if (device_create_file(&host->dev, &dev_attr_ibdev))
1983
		goto err_class;
1984
	if (device_create_file(&host->dev, &dev_attr_port))
1985 1986 1987 1988 1989
		goto err_class;

	return host;

err_class:
1990
	device_unregister(&host->dev);
1991

1992
free_host:
1993 1994 1995 1996 1997 1998 1999
	kfree(host);

	return NULL;
}

static void srp_add_one(struct ib_device *device)
{
2000 2001 2002
	struct srp_device *srp_dev;
	struct ib_device_attr *dev_attr;
	struct ib_fmr_pool_param fmr_param;
2003 2004 2005
	struct srp_host *host;
	int s, e, p;

2006 2007
	dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
	if (!dev_attr)
2008
		return;
2009

2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026
	if (ib_query_device(device, dev_attr)) {
		printk(KERN_WARNING PFX "Query device failed for %s\n",
		       device->name);
		goto free_attr;
	}

	srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL);
	if (!srp_dev)
		goto free_attr;

	/*
	 * Use the smallest page size supported by the HCA, down to a
	 * minimum of 512 bytes (which is the smallest sector that a
	 * SCSI command will ever carry).
	 */
	srp_dev->fmr_page_shift = max(9, ffs(dev_attr->page_size_cap) - 1);
	srp_dev->fmr_page_size  = 1 << srp_dev->fmr_page_shift;
2027
	srp_dev->fmr_page_mask  = ~((u64) srp_dev->fmr_page_size - 1);
2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055

	INIT_LIST_HEAD(&srp_dev->dev_list);

	srp_dev->dev = device;
	srp_dev->pd  = ib_alloc_pd(device);
	if (IS_ERR(srp_dev->pd))
		goto free_dev;

	srp_dev->mr = ib_get_dma_mr(srp_dev->pd,
				    IB_ACCESS_LOCAL_WRITE |
				    IB_ACCESS_REMOTE_READ |
				    IB_ACCESS_REMOTE_WRITE);
	if (IS_ERR(srp_dev->mr))
		goto err_pd;

	memset(&fmr_param, 0, sizeof fmr_param);
	fmr_param.pool_size	    = SRP_FMR_POOL_SIZE;
	fmr_param.dirty_watermark   = SRP_FMR_DIRTY_SIZE;
	fmr_param.cache		    = 1;
	fmr_param.max_pages_per_fmr = SRP_FMR_SIZE;
	fmr_param.page_shift	    = srp_dev->fmr_page_shift;
	fmr_param.access	    = (IB_ACCESS_LOCAL_WRITE |
				       IB_ACCESS_REMOTE_WRITE |
				       IB_ACCESS_REMOTE_READ);

	srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param);
	if (IS_ERR(srp_dev->fmr_pool))
		srp_dev->fmr_pool = NULL;
2056

T
Tom Tucker 已提交
2057
	if (device->node_type == RDMA_NODE_IB_SWITCH) {
2058 2059 2060 2061 2062 2063 2064 2065
		s = 0;
		e = 0;
	} else {
		s = 1;
		e = device->phys_port_cnt;
	}

	for (p = s; p <= e; ++p) {
2066
		host = srp_add_port(srp_dev, p);
2067
		if (host)
2068
			list_add_tail(&host->list, &srp_dev->dev_list);
2069 2070
	}

2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082
	ib_set_client_data(device, &srp_client, srp_dev);

	goto free_attr;

err_pd:
	ib_dealloc_pd(srp_dev->pd);

free_dev:
	kfree(srp_dev);

free_attr:
	kfree(dev_attr);
2083 2084 2085 2086
}

static void srp_remove_one(struct ib_device *device)
{
2087
	struct srp_device *srp_dev;
2088 2089 2090 2091
	struct srp_host *host, *tmp_host;
	LIST_HEAD(target_list);
	struct srp_target_port *target, *tmp_target;

2092
	srp_dev = ib_get_client_data(device, &srp_client);
2093

2094
	list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) {
2095
		device_unregister(&host->dev);
2096 2097 2098 2099 2100 2101 2102 2103 2104 2105
		/*
		 * Wait for the sysfs entry to go away, so that no new
		 * target ports can be created.
		 */
		wait_for_completion(&host->released);

		/*
		 * Mark all target ports as removed, so we stop queueing
		 * commands and don't try to reconnect.
		 */
2106
		spin_lock(&host->target_lock);
2107
		list_for_each_entry(target, &host->target_list, list) {
2108 2109 2110
			spin_lock_irq(target->scsi_host->host_lock);
			target->state = SRP_TARGET_REMOVED;
			spin_unlock_irq(target->scsi_host->host_lock);
2111
		}
2112
		spin_unlock(&host->target_lock);
2113 2114 2115 2116 2117 2118 2119 2120 2121 2122

		/*
		 * Wait for any reconnection tasks that may have
		 * started before we marked our target ports as
		 * removed, and any target port removal tasks.
		 */
		flush_scheduled_work();

		list_for_each_entry_safe(target, tmp_target,
					 &host->target_list, list) {
2123
			srp_remove_host(target->scsi_host);
2124
			scsi_remove_host(target->scsi_host);
2125 2126 2127 2128 2129 2130 2131 2132 2133
			srp_disconnect_target(target);
			ib_destroy_cm_id(target->cm_id);
			srp_free_target_ib(target);
			scsi_host_put(target->scsi_host);
		}

		kfree(host);
	}

2134 2135 2136 2137 2138 2139
	if (srp_dev->fmr_pool)
		ib_destroy_fmr_pool(srp_dev->fmr_pool);
	ib_dereg_mr(srp_dev->mr);
	ib_dealloc_pd(srp_dev->pd);

	kfree(srp_dev);
2140 2141
}

2142 2143 2144
static struct srp_function_template ib_srp_transport_functions = {
};

2145 2146 2147 2148
static int __init srp_init_module(void)
{
	int ret;

2149 2150 2151 2152 2153
	if (srp_sg_tablesize > 255) {
		printk(KERN_WARNING PFX "Clamping srp_sg_tablesize to 255\n");
		srp_sg_tablesize = 255;
	}

2154 2155 2156 2157 2158
	ib_srp_transport_template =
		srp_attach_transport(&ib_srp_transport_functions);
	if (!ib_srp_transport_template)
		return -ENOMEM;

2159 2160 2161 2162 2163
	srp_template.sg_tablesize = srp_sg_tablesize;
	srp_max_iu_len = (sizeof (struct srp_cmd) +
			  sizeof (struct srp_indirect_buf) +
			  srp_sg_tablesize * 16);

2164 2165 2166
	ret = class_register(&srp_class);
	if (ret) {
		printk(KERN_ERR PFX "couldn't register class infiniband_srp\n");
2167
		srp_release_transport(ib_srp_transport_template);
2168 2169 2170
		return ret;
	}

2171 2172
	ib_sa_register_client(&srp_sa_client);

2173 2174 2175
	ret = ib_register_client(&srp_client);
	if (ret) {
		printk(KERN_ERR PFX "couldn't register IB client\n");
2176
		srp_release_transport(ib_srp_transport_template);
2177
		ib_sa_unregister_client(&srp_sa_client);
2178 2179 2180 2181 2182 2183 2184 2185 2186 2187
		class_unregister(&srp_class);
		return ret;
	}

	return 0;
}

static void __exit srp_cleanup_module(void)
{
	ib_unregister_client(&srp_client);
2188
	ib_sa_unregister_client(&srp_sa_client);
2189
	class_unregister(&srp_class);
2190
	srp_release_transport(ib_srp_transport_template);
2191 2192 2193 2194
}

module_init(srp_init_module);
module_exit(srp_cleanup_module);