iscsi_iser.c 19.0 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 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73
/*
 * iSCSI Initiator over iSER Data-Path
 *
 * Copyright (C) 2004 Dmitry Yusupov
 * Copyright (C) 2004 Alex Aizman
 * Copyright (C) 2005 Mike Christie
 * Copyright (c) 2005, 2006 Voltaire, Inc. All rights reserved.
 * maintained by openib-general@openib.org
 *
 * 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.
 *
 * Credits:
 *	Christoph Hellwig
 *	FUJITA Tomonori
 *	Arne Redlich
 *	Zhenyu Wang
 * Modified by:
 *      Erez Zilber
 */

#include <linux/types.h>
#include <linux/list.h>
#include <linux/hardirq.h>
#include <linux/kfifo.h>
#include <linux/blkdev.h>
#include <linux/init.h>
#include <linux/ioctl.h>
#include <linux/cdev.h>
#include <linux/in.h>
#include <linux/net.h>
#include <linux/scatterlist.h>
#include <linux/delay.h>

#include <net/sock.h>

#include <asm/uaccess.h>

#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_eh.h>
#include <scsi/scsi_tcq.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi.h>
#include <scsi/scsi_transport_iscsi.h>

#include "iscsi_iser.h"

74 75 76 77
static struct scsi_host_template iscsi_iser_sht;
static struct iscsi_transport iscsi_iser_transport;
static struct scsi_transport_template *iscsi_iser_scsi_transport;

78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112
static unsigned int iscsi_max_lun = 512;
module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO);

int iser_debug_level = 0;

MODULE_DESCRIPTION("iSER (iSCSI Extensions for RDMA) Datamover "
		   "v" DRV_VER " (" DRV_DATE ")");
MODULE_LICENSE("Dual BSD/GPL");
MODULE_AUTHOR("Alex Nezhinsky, Dan Bar Dov, Or Gerlitz");

module_param_named(debug_level, iser_debug_level, int, 0644);
MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:disabled)");

struct iser_global ig;

void
iscsi_iser_recv(struct iscsi_conn *conn,
		struct iscsi_hdr *hdr, char *rx_data, int rx_data_len)
{
	int rc = 0;
	int datalen;
	int ahslen;

	/* verify PDU length */
	datalen = ntoh24(hdr->dlength);
	if (datalen != rx_data_len) {
		printk(KERN_ERR "iscsi_iser: datalen %d (hdr) != %d (IB) \n",
		       datalen, rx_data_len);
		rc = ISCSI_ERR_DATALEN;
		goto error;
	}

	/* read AHS */
	ahslen = hdr->hlength * 4;

113
	rc = iscsi_complete_pdu(conn, hdr, rx_data, rx_data_len);
114 115 116 117 118 119 120 121
	if (rc && rc != ISCSI_ERR_NO_SCSI_CMD)
		goto error;

	return;
error:
	iscsi_conn_failure(conn, rc);
}

122
static int iscsi_iser_pdu_alloc(struct iscsi_task *task, uint8_t opcode)
123 124 125 126 127 128 129
{
	struct iscsi_iser_task *iser_task = task->dd_data;

	task->hdr = (struct iscsi_hdr *)&iser_task->desc.iscsi_header;
	task->hdr_max = sizeof(iser_task->desc.iscsi_header);
	return 0;
}
130 131

/**
132 133
 * iscsi_iser_task_init - Initialize task
 * @task: iscsi task
134
 *
135
 * Initialize the task for the scsi command or mgmt command.
136
 */
137
static int
138
iscsi_iser_task_init(struct iscsi_task *task)
139
{
140 141
	struct iscsi_iser_conn *iser_conn  = task->conn->dd_data;
	struct iscsi_iser_task *iser_task = task->dd_data;
142

143 144 145
	/* mgmt task */
	if (!task->sc) {
		iser_task->desc.data = task->data;
146 147
		return 0;
	}
148

149 150 151
	iser_task->command_sent = 0;
	iser_task->iser_conn    = iser_conn;
	iser_task_rdma_init(iser_task);
152
	return 0;
153 154 155
}

/**
156
 * iscsi_iser_mtask_xmit - xmit management(immediate) task
157
 * @conn: iscsi connection
158
 * @task: task management task
159 160 161 162 163 164 165 166
 *
 * Notes:
 *	The function can return -EAGAIN in which case caller must
 *	call it again later, or recover. '0' return code means successful
 *	xmit.
 *
 **/
static int
167
iscsi_iser_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task)
168 169 170
{
	int error = 0;

171
	iser_dbg("task deq [cid %d itt 0x%x]\n", conn->id, task->itt);
172

173
	error = iser_send_control(conn, task);
174

175
	/* since iser xmits control with zero copy, tasks can not be recycled
176 177
	 * right after sending them.
	 * The recycling scheme is based on whether a response is expected
178 179
	 * - if yes, the task is recycled at iscsi_complete_pdu
	 * - if no,  the task is recycled at iser_snd_completion
180
	 */
181
	if (error && error != -ENOBUFS)
182 183 184 185 186 187
		iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);

	return error;
}

static int
188
iscsi_iser_task_xmit_unsol_data(struct iscsi_conn *conn,
189
				 struct iscsi_task *task)
190
{
191 192
	struct iscsi_r2t_info *r2t = &task->unsol_r2t;
	struct iscsi_data hdr;
193 194 195
	int error = 0;

	/* Send data-out PDUs while there's still unsolicited data to send */
196 197
	while (iscsi_task_has_unsol_data(task)) {
		iscsi_prep_data_out_pdu(task, r2t, &hdr);
198
		iser_dbg("Sending data-out: itt 0x%x, data count %d\n",
199
			   hdr.itt, r2t->data_count);
200 201 202

		/* the buffer description has been passed with the command */
		/* Send the command */
203
		error = iser_send_data_out(conn, task, &hdr);
204
		if (error) {
205
			r2t->datasn--;
206
			goto iscsi_iser_task_xmit_unsol_data_exit;
207
		}
208
		r2t->sent += r2t->data_count;
209
		iser_dbg("Need to send %d more as data-out PDUs\n",
210
			   r2t->data_length - r2t->sent);
211 212
	}

213
iscsi_iser_task_xmit_unsol_data_exit:
214 215 216 217
	return error;
}

static int
218
iscsi_iser_task_xmit(struct iscsi_task *task)
219
{
220 221
	struct iscsi_conn *conn = task->conn;
	struct iscsi_iser_task *iser_task = task->dd_data;
222 223
	int error = 0;

224 225
	if (!task->sc)
		return iscsi_iser_mtask_xmit(conn, task);
226

227 228
	if (task->sc->sc_data_direction == DMA_TO_DEVICE) {
		BUG_ON(scsi_bufflen(task->sc) == 0);
229

230
		iser_dbg("cmd [itt %x total %d imm %d unsol_data %d\n",
231
			   task->itt, scsi_bufflen(task->sc),
232
			   task->imm_count, task->unsol_r2t.data_length);
233 234
	}

235
	iser_dbg("task deq [cid %d itt 0x%x]\n",
236
		   conn->id, task->itt);
237 238

	/* Send the cmd PDU */
239 240
	if (!iser_task->command_sent) {
		error = iser_send_command(conn, task);
241
		if (error)
242
			goto iscsi_iser_task_xmit_exit;
243
		iser_task->command_sent = 1;
244 245 246
	}

	/* Send unsolicited data-out PDU(s) if necessary */
247
	if (iscsi_task_has_unsol_data(task))
248
		error = iscsi_iser_task_xmit_unsol_data(conn, task);
249

250
 iscsi_iser_task_xmit_exit:
251
	if (error && error != -ENOBUFS)
252 253 254 255
		iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
	return error;
}

256
static void iscsi_iser_cleanup_task(struct iscsi_task *task)
257
{
258
	struct iscsi_iser_task *iser_task = task->dd_data;
259

260 261
	/* mgmt tasks do not need special cleanup */
	if (!task->sc)
262
		return;
263

264 265 266
	if (iser_task->status == ISER_TASK_STATUS_STARTED) {
		iser_task->status = ISER_TASK_STATUS_COMPLETED;
		iser_task_rdma_finalize(iser_task);
267 268 269 270 271 272 273 274 275 276
	}
}

static struct iscsi_cls_conn *
iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
{
	struct iscsi_conn *conn;
	struct iscsi_cls_conn *cls_conn;
	struct iscsi_iser_conn *iser_conn;

277
	cls_conn = iscsi_conn_setup(cls_session, sizeof(*iser_conn), conn_idx);
278 279 280 281 282 283 284 285
	if (!cls_conn)
		return NULL;
	conn = cls_conn->dd_data;

	/*
	 * due to issues with the login code re iser sematics
	 * this not set in iscsi_conn_setup - FIXME
	 */
286
	conn->max_recv_dlength = ISER_RECV_DATA_SEG_LEN;
287

288
	iser_conn = conn->dd_data;
289 290 291 292 293 294 295 296 297 298 299
	conn->dd_data = iser_conn;
	iser_conn->iscsi_conn = conn;

	return cls_conn;
}

static void
iscsi_iser_conn_destroy(struct iscsi_cls_conn *cls_conn)
{
	struct iscsi_conn *conn = cls_conn->dd_data;
	struct iscsi_iser_conn *iser_conn = conn->dd_data;
300
	struct iser_conn *ib_conn = iser_conn->ib_conn;
301 302

	iscsi_conn_teardown(cls_conn);
303 304 305 306 307 308 309 310 311
	/*
	 * Userspace will normally call the stop callback and
	 * already have freed the ib_conn, but if it goofed up then
	 * we free it here.
	 */
	if (ib_conn) {
		ib_conn->iser_conn = NULL;
		iser_conn_put(ib_conn);
	}
312 313 314 315 316 317 318 319 320 321
}

static int
iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session,
		     struct iscsi_cls_conn *cls_conn, uint64_t transport_eph,
		     int is_leading)
{
	struct iscsi_conn *conn = cls_conn->dd_data;
	struct iscsi_iser_conn *iser_conn;
	struct iser_conn *ib_conn;
322
	struct iscsi_endpoint *ep;
323 324 325 326 327 328 329 330
	int error;

	error = iscsi_conn_bind(cls_session, cls_conn, is_leading);
	if (error)
		return error;

	/* the transport ep handle comes from user space so it must be
	 * verified against the global ib connections list */
331 332
	ep = iscsi_lookup_endpoint(transport_eph);
	if (!ep) {
333 334 335 336
		iser_err("can't bind eph %llx\n",
			 (unsigned long long)transport_eph);
		return -EINVAL;
	}
337 338
	ib_conn = ep->dd_data;

339 340 341 342 343 344 345
	/* binds the iSER connection retrieved from the previously
	 * connected ep_handle to the iSCSI layer connection. exchanges
	 * connection pointers */
	iser_err("binding iscsi conn %p to iser_conn %p\n",conn,ib_conn);
	iser_conn = conn->dd_data;
	ib_conn->iser_conn = iser_conn;
	iser_conn->ib_conn  = ib_conn;
346
	iser_conn_get(ib_conn);
347 348 349
	return 0;
}

350 351 352 353 354 355
static void
iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
{
	struct iscsi_conn *conn = cls_conn->dd_data;
	struct iscsi_iser_conn *iser_conn = conn->dd_data;
	struct iser_conn *ib_conn = iser_conn->ib_conn;
356

357
	/*
358 359
	 * Userspace may have goofed up and not bound the connection or
	 * might have only partially setup the connection.
360
	 */
361 362 363 364 365 366 367 368
	if (ib_conn) {
		iscsi_conn_stop(cls_conn, flag);
		/*
		 * There is no unbind event so the stop callback
		 * must release the ref from the bind.
		 */
		iser_conn_put(ib_conn);
	}
369
	iser_conn->ib_conn = NULL;
370 371 372 373 374 375 376 377
}

static int
iscsi_iser_conn_start(struct iscsi_cls_conn *cls_conn)
{
	struct iscsi_conn *conn = cls_conn->dd_data;
	int err;

378
	err = iser_conn_set_full_featured_mode(conn);
379 380 381
	if (err)
		return err;

382
	return iscsi_conn_start(cls_conn);
383 384
}

385 386 387 388
static void iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session)
{
	struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);

389
	iscsi_session_teardown(cls_session);
390 391
	iscsi_host_remove(shost);
	iscsi_host_free(shost);
392
}
393 394

static struct iscsi_cls_session *
395
iscsi_iser_session_create(struct iscsi_endpoint *ep,
396
			  uint16_t cmds_max, uint16_t qdepth,
397
			  uint32_t initial_cmdsn)
398 399 400
{
	struct iscsi_cls_session *cls_session;
	struct iscsi_session *session;
401 402
	struct Scsi_Host *shost;
	struct iser_conn *ib_conn;
403

404
	shost = iscsi_host_alloc(&iscsi_iser_sht, 0, 1);
405 406 407 408 409 410 411 412
	if (!shost)
		return NULL;
	shost->transportt = iscsi_iser_scsi_transport;
	shost->max_lun = iscsi_max_lun;
	shost->max_id = 0;
	shost->max_channel = 0;
	shost->max_cmd_len = 16;

413 414 415 416 417 418 419 420 421
	/*
	 * older userspace tools (before 2.0-870) did not pass us
	 * the leading conn's ep so this will be NULL;
	 */
	if (ep)
		ib_conn = ep->dd_data;

	if (iscsi_host_add(shost,
			   ep ? ib_conn->device->ib_device->dma_device : NULL))
422
		goto free_host;
423

424 425 426 427
	/*
	 * we do not support setting can_queue cmd_per_lun from userspace yet
	 * because we preallocate so many resources
	 */
428
	cls_session = iscsi_session_setup(&iscsi_iser_transport, shost,
429
					  ISCSI_DEF_XMIT_CMDS_MAX, 0,
430
					  sizeof(struct iscsi_iser_task),
431
					  initial_cmdsn, 0);
432
	if (!cls_session)
433 434
		goto remove_host;
	session = cls_session->dd_data;
435

436
	shost->can_queue = session->scsi_cmds_max;
437
	return cls_session;
438 439

remove_host:
440
	iscsi_host_remove(shost);
441
free_host:
442
	iscsi_host_free(shost);
443
	return NULL;
444 445 446
}

static int
447 448
iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn,
		     enum iscsi_param param, char *buf, int buflen)
449
{
450
	int value;
451 452 453 454 455 456

	switch (param) {
	case ISCSI_PARAM_MAX_RECV_DLENGTH:
		/* TBD */
		break;
	case ISCSI_PARAM_HDRDGST_EN:
457
		sscanf(buf, "%d", &value);
458 459 460 461 462 463
		if (value) {
			printk(KERN_ERR "DataDigest wasn't negotiated to None");
			return -EPROTO;
		}
		break;
	case ISCSI_PARAM_DATADGST_EN:
464
		sscanf(buf, "%d", &value);
465 466 467 468 469 470
		if (value) {
			printk(KERN_ERR "DataDigest wasn't negotiated to None");
			return -EPROTO;
		}
		break;
	case ISCSI_PARAM_IFMARKER_EN:
471
		sscanf(buf, "%d", &value);
472 473 474 475 476 477
		if (value) {
			printk(KERN_ERR "IFMarker wasn't negotiated to No");
			return -EPROTO;
		}
		break;
	case ISCSI_PARAM_OFMARKER_EN:
478
		sscanf(buf, "%d", &value);
479 480 481 482 483 484
		if (value) {
			printk(KERN_ERR "OFMarker wasn't negotiated to No");
			return -EPROTO;
		}
		break;
	default:
485
		return iscsi_set_param(cls_conn, param, buf, buflen);
486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504
	}

	return 0;
}

static void
iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats)
{
	struct iscsi_conn *conn = cls_conn->dd_data;

	stats->txdata_octets = conn->txdata_octets;
	stats->rxdata_octets = conn->rxdata_octets;
	stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
	stats->dataout_pdus = conn->dataout_pdus_cnt;
	stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
	stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */
	stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */
	stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
	stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
505
	stats->custom_length = 4;
506 507 508 509 510 511
	strcpy(stats->custom[0].desc, "qp_tx_queue_full");
	stats->custom[0].value = 0; /* TB iser_conn->qp_tx_queue_full; */
	strcpy(stats->custom[1].desc, "fmr_map_not_avail");
	stats->custom[1].value = 0; /* TB iser_conn->fmr_map_not_avail */;
	strcpy(stats->custom[2].desc, "eh_abort_cnt");
	stats->custom[2].value = conn->eh_abort_cnt;
512 513
	strcpy(stats->custom[3].desc, "fmr_unalign_cnt");
	stats->custom[3].value = conn->fmr_unalign_cnt;
514 515
}

516
static struct iscsi_endpoint *
517 518
iscsi_iser_ep_connect(struct Scsi_Host *shost, struct sockaddr *dst_addr,
		      int non_blocking)
519 520 521
{
	int err;
	struct iser_conn *ib_conn;
522
	struct iscsi_endpoint *ep;
523

524 525 526
	ep = iscsi_create_endpoint(sizeof(*ib_conn));
	if (!ep)
		return ERR_PTR(-ENOMEM);
527

528 529 530
	ib_conn = ep->dd_data;
	ib_conn->ep = ep;
	iser_conn_init(ib_conn);
531

532 533 534 535 536 537 538
	err = iser_connect(ib_conn, NULL, (struct sockaddr_in *)dst_addr,
			   non_blocking);
	if (err) {
		iscsi_destroy_endpoint(ep);
		return ERR_PTR(err);
	}
	return ep;
539 540 541
}

static int
542
iscsi_iser_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
543
{
544
	struct iser_conn *ib_conn;
545 546
	int rc;

547
	ib_conn = ep->dd_data;
548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568
	rc = wait_event_interruptible_timeout(ib_conn->wait,
			     ib_conn->state == ISER_CONN_UP,
			     msecs_to_jiffies(timeout_ms));

	/* if conn establishment failed, return error code to iscsi */
	if (!rc &&
	    (ib_conn->state == ISER_CONN_TERMINATING ||
	     ib_conn->state == ISER_CONN_DOWN))
		rc = -1;

	iser_err("ib conn %p rc = %d\n", ib_conn, rc);

	if (rc > 0)
		return 1; /* success, this is the equivalent of POLLOUT */
	else if (!rc)
		return 0; /* timeout */
	else
		return rc; /* signal */
}

static void
569
iscsi_iser_ep_disconnect(struct iscsi_endpoint *ep)
570
{
571
	struct iser_conn *ib_conn;
572

573
	ib_conn = ep->dd_data;
574 575 576 577 578 579 580 581 582 583
	if (ib_conn->iser_conn)
		/*
		 * Must suspend xmit path if the ep is bound to the
		 * iscsi_conn, so we know we are not accessing the ib_conn
		 * when we free it.
		 *
		 * This may not be bound if the ep poll failed.
		 */
		iscsi_suspend_tx(ib_conn->iser_conn->iscsi_conn);

584 585 586 587 588 589

	iser_err("ib conn %p state %d\n",ib_conn, ib_conn->state);
	iser_conn_terminate(ib_conn);
}

static struct scsi_host_template iscsi_iser_sht = {
590
	.module                 = THIS_MODULE,
591 592
	.name                   = "iSCSI Initiator over iSER, v." DRV_VER,
	.queuecommand           = iscsi_queuecommand,
593
	.change_queue_depth	= iscsi_change_queue_depth,
594
	.sg_tablesize           = ISCSI_ISER_SG_TABLESIZE,
595
	.max_sectors		= 1024,
596
	.cmd_per_lun            = ISER_DEF_CMD_PER_LUN,
597
	.eh_abort_handler       = iscsi_eh_abort,
598
	.eh_device_reset_handler= iscsi_eh_device_reset,
599
	.eh_target_reset_handler= iscsi_eh_target_reset,
600
	.target_alloc		= iscsi_target_alloc,
601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619
	.use_clustering         = DISABLE_CLUSTERING,
	.proc_name              = "iscsi_iser",
	.this_id                = -1,
};

static struct iscsi_transport iscsi_iser_transport = {
	.owner                  = THIS_MODULE,
	.name                   = "iser",
	.caps                   = CAP_RECOVERY_L0 | CAP_MULTI_R2T,
	.param_mask		= ISCSI_MAX_RECV_DLENGTH |
				  ISCSI_MAX_XMIT_DLENGTH |
				  ISCSI_HDRDGST_EN |
				  ISCSI_DATADGST_EN |
				  ISCSI_INITIAL_R2T_EN |
				  ISCSI_MAX_R2T |
				  ISCSI_IMM_DATA_EN |
				  ISCSI_FIRST_BURST |
				  ISCSI_MAX_BURST |
				  ISCSI_PDU_INORDER_EN |
620 621 622 623
				  ISCSI_DATASEQ_INORDER_EN |
				  ISCSI_EXP_STATSN |
				  ISCSI_PERSISTENT_PORT |
				  ISCSI_PERSISTENT_ADDRESS |
624 625
				  ISCSI_TARGET_NAME | ISCSI_TPGT |
				  ISCSI_USERNAME | ISCSI_PASSWORD |
626 627
				  ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN |
				  ISCSI_FAST_ABORT | ISCSI_ABORT_TMO |
628
				  ISCSI_LU_RESET_TMO | ISCSI_TGT_RESET_TMO |
629 630
				  ISCSI_PING_TMO | ISCSI_RECV_TMO |
				  ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME,
631
	.host_param_mask	= ISCSI_HOST_HWADDRESS |
632
				  ISCSI_HOST_NETDEV_NAME |
633
				  ISCSI_HOST_INITIATOR_NAME,
634 635
	/* session management */
	.create_session         = iscsi_iser_session_create,
636
	.destroy_session        = iscsi_iser_session_destroy,
637 638 639 640
	/* connection management */
	.create_conn            = iscsi_iser_conn_create,
	.bind_conn              = iscsi_iser_conn_bind,
	.destroy_conn           = iscsi_iser_conn_destroy,
641 642 643
	.set_param              = iscsi_iser_set_param,
	.get_conn_param		= iscsi_conn_get_param,
	.get_session_param	= iscsi_session_get_param,
644
	.start_conn             = iscsi_iser_conn_start,
645
	.stop_conn              = iscsi_iser_conn_stop,
646 647 648
	/* iscsi host params */
	.get_host_param		= iscsi_host_get_param,
	.set_host_param		= iscsi_host_set_param,
649 650 651
	/* IO */
	.send_pdu		= iscsi_conn_send_pdu,
	.get_stats		= iscsi_iser_conn_get_stats,
652 653 654
	.init_task		= iscsi_iser_task_init,
	.xmit_task		= iscsi_iser_task_xmit,
	.cleanup_task		= iscsi_iser_cleanup_task,
655
	.alloc_pdu		= iscsi_iser_pdu_alloc,
656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679
	/* recovery */
	.session_recovery_timedout = iscsi_session_recovery_timedout,

	.ep_connect             = iscsi_iser_ep_connect,
	.ep_poll                = iscsi_iser_ep_poll,
	.ep_disconnect          = iscsi_iser_ep_disconnect
};

static int __init iser_init(void)
{
	int err;

	iser_dbg("Starting iSER datamover...\n");

	if (iscsi_max_lun < 1) {
		printk(KERN_ERR "Invalid max_lun value of %u\n", iscsi_max_lun);
		return -EINVAL;
	}

	memset(&ig, 0, sizeof(struct iser_global));

	ig.desc_cache = kmem_cache_create("iser_descriptors",
					  sizeof (struct iser_desc),
					  0, SLAB_HWCACHE_ALIGN,
680
					  NULL);
681 682 683 684 685 686 687 688 689
	if (ig.desc_cache == NULL)
		return -ENOMEM;

	/* device init is called only after the first addr resolution */
	mutex_init(&ig.device_list_mutex);
	INIT_LIST_HEAD(&ig.device_list);
	mutex_init(&ig.connlist_mutex);
	INIT_LIST_HEAD(&ig.connlist);

690 691 692
	iscsi_iser_scsi_transport = iscsi_register_transport(
							&iscsi_iser_transport);
	if (!iscsi_iser_scsi_transport) {
693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714
		iser_err("iscsi_register_transport failed\n");
		err = -EINVAL;
		goto register_transport_failure;
	}

	return 0;

register_transport_failure:
	kmem_cache_destroy(ig.desc_cache);

	return err;
}

static void __exit iser_exit(void)
{
	iser_dbg("Removing iSER datamover...\n");
	iscsi_unregister_transport(&iscsi_iser_transport);
	kmem_cache_destroy(ig.desc_cache);
}

module_init(iser_init);
module_exit(iser_exit);