1 /*
2  * iSCSI Initiator over iSER Data-Path
3  *
4  * Copyright (C) 2004 Dmitry Yusupov
5  * Copyright (C) 2004 Alex Aizman
6  * Copyright (C) 2005 Mike Christie
7  * Copyright (c) 2005, 2006 Voltaire, Inc. All rights reserved.
8  * maintained by openib-general@openib.org
9  *
10  * This software is available to you under a choice of one of two
11  * licenses.  You may choose to be licensed under the terms of the GNU
12  * General Public License (GPL) Version 2, available from the file
13  * COPYING in the main directory of this source tree, or the
14  * OpenIB.org BSD license below:
15  *
16  *     Redistribution and use in source and binary forms, with or
17  *     without modification, are permitted provided that the following
18  *     conditions are met:
19  *
20  *	- Redistributions of source code must retain the above
21  *	  copyright notice, this list of conditions and the following
22  *	  disclaimer.
23  *
24  *	- Redistributions in binary form must reproduce the above
25  *	  copyright notice, this list of conditions and the following
26  *	  disclaimer in the documentation and/or other materials
27  *	  provided with the distribution.
28  *
29  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
30  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
31  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
32  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
33  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
34  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
35  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
36  * SOFTWARE.
37  *
38  * Credits:
39  *	Christoph Hellwig
40  *	FUJITA Tomonori
41  *	Arne Redlich
42  *	Zhenyu Wang
43  * Modified by:
44  *      Erez Zilber
45  */
46 
47 #include <linux/types.h>
48 #include <linux/list.h>
49 #include <linux/hardirq.h>
50 #include <linux/kfifo.h>
51 #include <linux/blkdev.h>
52 #include <linux/init.h>
53 #include <linux/ioctl.h>
54 #include <linux/cdev.h>
55 #include <linux/in.h>
56 #include <linux/net.h>
57 #include <linux/scatterlist.h>
58 #include <linux/delay.h>
59 
60 #include <net/sock.h>
61 
62 #include <asm/uaccess.h>
63 
64 #include <scsi/scsi_cmnd.h>
65 #include <scsi/scsi_device.h>
66 #include <scsi/scsi_eh.h>
67 #include <scsi/scsi_tcq.h>
68 #include <scsi/scsi_host.h>
69 #include <scsi/scsi.h>
70 #include <scsi/scsi_transport_iscsi.h>
71 
72 #include "iscsi_iser.h"
73 
74 static struct scsi_host_template iscsi_iser_sht;
75 static struct iscsi_transport iscsi_iser_transport;
76 static struct scsi_transport_template *iscsi_iser_scsi_transport;
77 
78 static unsigned int iscsi_max_lun = 512;
79 module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO);
80 
81 int iser_debug_level = 0;
82 
83 MODULE_DESCRIPTION("iSER (iSCSI Extensions for RDMA) Datamover "
84 		   "v" DRV_VER " (" DRV_DATE ")");
85 MODULE_LICENSE("Dual BSD/GPL");
86 MODULE_AUTHOR("Alex Nezhinsky, Dan Bar Dov, Or Gerlitz");
87 
88 module_param_named(debug_level, iser_debug_level, int, 0644);
89 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:disabled)");
90 
91 struct iser_global ig;
92 
93 void
94 iscsi_iser_recv(struct iscsi_conn *conn,
95 		struct iscsi_hdr *hdr, char *rx_data, int rx_data_len)
96 {
97 	int rc = 0;
98 	int datalen;
99 	int ahslen;
100 
101 	/* verify PDU length */
102 	datalen = ntoh24(hdr->dlength);
103 	if (datalen != rx_data_len) {
104 		printk(KERN_ERR "iscsi_iser: datalen %d (hdr) != %d (IB) \n",
105 		       datalen, rx_data_len);
106 		rc = ISCSI_ERR_DATALEN;
107 		goto error;
108 	}
109 
110 	/* read AHS */
111 	ahslen = hdr->hlength * 4;
112 
113 	rc = iscsi_complete_pdu(conn, hdr, rx_data, rx_data_len);
114 	if (rc && rc != ISCSI_ERR_NO_SCSI_CMD)
115 		goto error;
116 
117 	return;
118 error:
119 	iscsi_conn_failure(conn, rc);
120 }
121 
122 static int iscsi_iser_pdu_alloc(struct iscsi_task *task, uint8_t opcode)
123 {
124 	struct iscsi_iser_task *iser_task = task->dd_data;
125 
126 	task->hdr = (struct iscsi_hdr *)&iser_task->desc.iscsi_header;
127 	task->hdr_max = sizeof(iser_task->desc.iscsi_header);
128 	return 0;
129 }
130 
131 /**
132  * iscsi_iser_task_init - Initialize task
133  * @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 	struct iscsi_iser_conn *iser_conn  = task->conn->dd_data;
141 	struct iscsi_iser_task *iser_task = task->dd_data;
142 
143 	/* mgmt task */
144 	if (!task->sc) {
145 		iser_task->desc.data = task->data;
146 		return 0;
147 	}
148 
149 	iser_task->command_sent = 0;
150 	iser_task->iser_conn    = iser_conn;
151 	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  * Notes:
161  *	The function can return -EAGAIN in which case caller must
162  *	call it again later, or recover. '0' return code means successful
163  *	xmit.
164  *
165  **/
166 static int
167 iscsi_iser_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task)
168 {
169 	int error = 0;
170 
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 	 * right after sending them.
177 	 * The recycling scheme is based on whether a response is expected
178 	 * - if yes, the task is recycled at iscsi_complete_pdu
179 	 * - if no,  the task is recycled at iser_snd_completion
180 	 */
181 	if (error && error != -ENOBUFS)
182 		iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
183 
184 	return error;
185 }
186 
187 static int
188 iscsi_iser_task_xmit_unsol_data(struct iscsi_conn *conn,
189 				 struct iscsi_task *task)
190 {
191 	struct iscsi_r2t_info *r2t = &task->unsol_r2t;
192 	struct iscsi_data hdr;
193 	int error = 0;
194 
195 	/* Send data-out PDUs while there's still unsolicited data to send */
196 	while (iscsi_task_has_unsol_data(task)) {
197 		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 		/* the buffer description has been passed with the command */
202 		/* 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 	return error;
215 }
216 
217 static int
218 iscsi_iser_task_xmit(struct iscsi_task *task)
219 {
220 	struct iscsi_conn *conn = task->conn;
221 	struct iscsi_iser_task *iser_task = task->dd_data;
222 	int error = 0;
223 
224 	if (!task->sc)
225 		return iscsi_iser_mtask_xmit(conn, task);
226 
227 	if (task->sc->sc_data_direction == DMA_TO_DEVICE) {
228 		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 	if (!iser_task->command_sent) {
240 		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 		iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
253 	return error;
254 }
255 
256 static void iscsi_iser_cleanup_task(struct iscsi_task *task)
257 {
258 	struct iscsi_iser_task *iser_task = task->dd_data;
259 
260 	/* mgmt tasks do not need special cleanup */
261 	if (!task->sc)
262 		return;
263 
264 	if (iser_task->status == ISER_TASK_STATUS_STARTED) {
265 		iser_task->status = ISER_TASK_STATUS_COMPLETED;
266 		iser_task_rdma_finalize(iser_task);
267 	}
268 }
269 
270 static struct iscsi_cls_conn *
271 iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
272 {
273 	struct iscsi_conn *conn;
274 	struct iscsi_cls_conn *cls_conn;
275 	struct iscsi_iser_conn *iser_conn;
276 
277 	cls_conn = iscsi_conn_setup(cls_session, sizeof(*iser_conn), conn_idx);
278 	if (!cls_conn)
279 		return NULL;
280 	conn = cls_conn->dd_data;
281 
282 	/*
283 	 * due to issues with the login code re iser sematics
284 	 * this not set in iscsi_conn_setup - FIXME
285 	 */
286 	conn->max_recv_dlength = 128;
287 
288 	iser_conn = conn->dd_data;
289 	conn->dd_data = iser_conn;
290 	iser_conn->iscsi_conn = conn;
291 
292 	return cls_conn;
293 }
294 
295 static void
296 iscsi_iser_conn_destroy(struct iscsi_cls_conn *cls_conn)
297 {
298 	struct iscsi_conn *conn = cls_conn->dd_data;
299 	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 	 * Userspace will normally call the stop callback and
305 	 * already have freed the ib_conn, but if it goofed up then
306 	 * we free it here.
307 	 */
308 	if (ib_conn) {
309 		ib_conn->iser_conn = NULL;
310 		iser_conn_put(ib_conn);
311 	}
312 }
313 
314 static int
315 iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session,
316 		     struct iscsi_cls_conn *cls_conn, uint64_t transport_eph,
317 		     int is_leading)
318 {
319 	struct iscsi_conn *conn = cls_conn->dd_data;
320 	struct iscsi_iser_conn *iser_conn;
321 	struct iser_conn *ib_conn;
322 	struct iscsi_endpoint *ep;
323 	int error;
324 
325 	error = iscsi_conn_bind(cls_session, cls_conn, is_leading);
326 	if (error)
327 		return error;
328 
329 	/* the transport ep handle comes from user space so it must be
330 	 * verified against the global ib connections list */
331 	ep = iscsi_lookup_endpoint(transport_eph);
332 	if (!ep) {
333 		iser_err("can't bind eph %llx\n",
334 			 (unsigned long long)transport_eph);
335 		return -EINVAL;
336 	}
337 	ib_conn = ep->dd_data;
338 
339 	/* binds the iSER connection retrieved from the previously
340 	 * connected ep_handle to the iSCSI layer connection. exchanges
341 	 * connection pointers */
342 	iser_err("binding iscsi conn %p to iser_conn %p\n",conn,ib_conn);
343 	iser_conn = conn->dd_data;
344 	ib_conn->iser_conn = iser_conn;
345 	iser_conn->ib_conn  = ib_conn;
346 	iser_conn_get(ib_conn);
347 	return 0;
348 }
349 
350 static void
351 iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
352 {
353 	struct iscsi_conn *conn = cls_conn->dd_data;
354 	struct iscsi_iser_conn *iser_conn = conn->dd_data;
355 	struct iser_conn *ib_conn = iser_conn->ib_conn;
356 
357 	/*
358 	 * Userspace may have goofed up and not bound the connection or
359 	 * might have only partially setup the connection.
360 	 */
361 	if (ib_conn) {
362 		iscsi_conn_stop(cls_conn, flag);
363 		/*
364 		 * There is no unbind event so the stop callback
365 		 * must release the ref from the bind.
366 		 */
367 		iser_conn_put(ib_conn);
368 	}
369 	iser_conn->ib_conn = NULL;
370 }
371 
372 static int
373 iscsi_iser_conn_start(struct iscsi_cls_conn *cls_conn)
374 {
375 	struct iscsi_conn *conn = cls_conn->dd_data;
376 	int err;
377 
378 	err = iser_conn_set_full_featured_mode(conn);
379 	if (err)
380 		return err;
381 
382 	return iscsi_conn_start(cls_conn);
383 }
384 
385 static void iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session)
386 {
387 	struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
388 
389 	iscsi_session_teardown(cls_session);
390 	iscsi_host_remove(shost);
391 	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 	struct iscsi_cls_session *cls_session;
400 	struct iscsi_session *session;
401 	struct Scsi_Host *shost;
402 	struct iser_conn *ib_conn;
403 
404 	shost = iscsi_host_alloc(&iscsi_iser_sht, 0, 1);
405 	if (!shost)
406 		return NULL;
407 	shost->transportt = iscsi_iser_scsi_transport;
408 	shost->max_lun = iscsi_max_lun;
409 	shost->max_id = 0;
410 	shost->max_channel = 0;
411 	shost->max_cmd_len = 16;
412 
413 	/*
414 	 * older userspace tools (before 2.0-870) did not pass us
415 	 * the leading conn's ep so this will be NULL;
416 	 */
417 	if (ep)
418 		ib_conn = ep->dd_data;
419 
420 	if (iscsi_host_add(shost,
421 			   ep ? ib_conn->device->ib_device->dma_device : NULL))
422 		goto free_host;
423 
424 	/*
425 	 * we do not support setting can_queue cmd_per_lun from userspace yet
426 	 * because we preallocate so many resources
427 	 */
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 		goto remove_host;
434 	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 iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn,
448 		     enum iscsi_param param, char *buf, int buflen)
449 {
450 	int value;
451 
452 	switch (param) {
453 	case ISCSI_PARAM_MAX_RECV_DLENGTH:
454 		/* TBD */
455 		break;
456 	case ISCSI_PARAM_HDRDGST_EN:
457 		sscanf(buf, "%d", &value);
458 		if (value) {
459 			printk(KERN_ERR "DataDigest wasn't negotiated to None");
460 			return -EPROTO;
461 		}
462 		break;
463 	case ISCSI_PARAM_DATADGST_EN:
464 		sscanf(buf, "%d", &value);
465 		if (value) {
466 			printk(KERN_ERR "DataDigest wasn't negotiated to None");
467 			return -EPROTO;
468 		}
469 		break;
470 	case ISCSI_PARAM_IFMARKER_EN:
471 		sscanf(buf, "%d", &value);
472 		if (value) {
473 			printk(KERN_ERR "IFMarker wasn't negotiated to No");
474 			return -EPROTO;
475 		}
476 		break;
477 	case ISCSI_PARAM_OFMARKER_EN:
478 		sscanf(buf, "%d", &value);
479 		if (value) {
480 			printk(KERN_ERR "OFMarker wasn't negotiated to No");
481 			return -EPROTO;
482 		}
483 		break;
484 	default:
485 		return iscsi_set_param(cls_conn, param, buf, buflen);
486 	}
487 
488 	return 0;
489 }
490 
491 static void
492 iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats)
493 {
494 	struct iscsi_conn *conn = cls_conn->dd_data;
495 
496 	stats->txdata_octets = conn->txdata_octets;
497 	stats->rxdata_octets = conn->rxdata_octets;
498 	stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
499 	stats->dataout_pdus = conn->dataout_pdus_cnt;
500 	stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
501 	stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */
502 	stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */
503 	stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
504 	stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
505 	stats->custom_length = 4;
506 	strcpy(stats->custom[0].desc, "qp_tx_queue_full");
507 	stats->custom[0].value = 0; /* TB iser_conn->qp_tx_queue_full; */
508 	strcpy(stats->custom[1].desc, "fmr_map_not_avail");
509 	stats->custom[1].value = 0; /* TB iser_conn->fmr_map_not_avail */;
510 	strcpy(stats->custom[2].desc, "eh_abort_cnt");
511 	stats->custom[2].value = conn->eh_abort_cnt;
512 	strcpy(stats->custom[3].desc, "fmr_unalign_cnt");
513 	stats->custom[3].value = conn->fmr_unalign_cnt;
514 }
515 
516 static struct iscsi_endpoint *
517 iscsi_iser_ep_connect(struct Scsi_Host *shost, struct sockaddr *dst_addr,
518 		      int non_blocking)
519 {
520 	int err;
521 	struct iser_conn *ib_conn;
522 	struct iscsi_endpoint *ep;
523 
524 	ep = iscsi_create_endpoint(sizeof(*ib_conn));
525 	if (!ep)
526 		return ERR_PTR(-ENOMEM);
527 
528 	ib_conn = ep->dd_data;
529 	ib_conn->ep = ep;
530 	iser_conn_init(ib_conn);
531 
532 	err = iser_connect(ib_conn, NULL, (struct sockaddr_in *)dst_addr,
533 			   non_blocking);
534 	if (err) {
535 		iscsi_destroy_endpoint(ep);
536 		return ERR_PTR(err);
537 	}
538 	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 	int rc;
546 
547 	ib_conn = ep->dd_data;
548 	rc = wait_event_interruptible_timeout(ib_conn->wait,
549 			     ib_conn->state == ISER_CONN_UP,
550 			     msecs_to_jiffies(timeout_ms));
551 
552 	/* if conn establishment failed, return error code to iscsi */
553 	if (!rc &&
554 	    (ib_conn->state == ISER_CONN_TERMINATING ||
555 	     ib_conn->state == ISER_CONN_DOWN))
556 		rc = -1;
557 
558 	iser_err("ib conn %p rc = %d\n", ib_conn, rc);
559 
560 	if (rc > 0)
561 		return 1; /* success, this is the equivalent of POLLOUT */
562 	else if (!rc)
563 		return 0; /* timeout */
564 	else
565 		return rc; /* signal */
566 }
567 
568 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 	if (ib_conn->iser_conn)
575 		/*
576 		 * Must suspend xmit path if the ep is bound to the
577 		 * iscsi_conn, so we know we are not accessing the ib_conn
578 		 * when we free it.
579 		 *
580 		 * This may not be bound if the ep poll failed.
581 		 */
582 		iscsi_suspend_tx(ib_conn->iser_conn->iscsi_conn);
583 
584 
585 	iser_err("ib conn %p state %d\n",ib_conn, ib_conn->state);
586 	iser_conn_terminate(ib_conn);
587 }
588 
589 static struct scsi_host_template iscsi_iser_sht = {
590 	.module                 = THIS_MODULE,
591 	.name                   = "iSCSI Initiator over iSER, v." DRV_VER,
592 	.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 	.use_clustering         = DISABLE_CLUSTERING,
602 	.proc_name              = "iscsi_iser",
603 	.this_id                = -1,
604 };
605 
606 static struct iscsi_transport iscsi_iser_transport = {
607 	.owner                  = THIS_MODULE,
608 	.name                   = "iser",
609 	.caps                   = CAP_RECOVERY_L0 | CAP_MULTI_R2T,
610 	.param_mask		= ISCSI_MAX_RECV_DLENGTH |
611 				  ISCSI_MAX_XMIT_DLENGTH |
612 				  ISCSI_HDRDGST_EN |
613 				  ISCSI_DATADGST_EN |
614 				  ISCSI_INITIAL_R2T_EN |
615 				  ISCSI_MAX_R2T |
616 				  ISCSI_IMM_DATA_EN |
617 				  ISCSI_FIRST_BURST |
618 				  ISCSI_MAX_BURST |
619 				  ISCSI_PDU_INORDER_EN |
620 				  ISCSI_DATASEQ_INORDER_EN |
621 				  ISCSI_EXP_STATSN |
622 				  ISCSI_PERSISTENT_PORT |
623 				  ISCSI_PERSISTENT_ADDRESS |
624 				  ISCSI_TARGET_NAME | ISCSI_TPGT |
625 				  ISCSI_USERNAME | ISCSI_PASSWORD |
626 				  ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN |
627 				  ISCSI_FAST_ABORT | ISCSI_ABORT_TMO |
628 				  ISCSI_LU_RESET_TMO | ISCSI_TGT_RESET_TMO |
629 				  ISCSI_PING_TMO | ISCSI_RECV_TMO |
630 				  ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME,
631 	.host_param_mask	= ISCSI_HOST_HWADDRESS |
632 				  ISCSI_HOST_NETDEV_NAME |
633 				  ISCSI_HOST_INITIATOR_NAME,
634 	/* session management */
635 	.create_session         = iscsi_iser_session_create,
636 	.destroy_session        = iscsi_iser_session_destroy,
637 	/* connection management */
638 	.create_conn            = iscsi_iser_conn_create,
639 	.bind_conn              = iscsi_iser_conn_bind,
640 	.destroy_conn           = iscsi_iser_conn_destroy,
641 	.set_param              = iscsi_iser_set_param,
642 	.get_conn_param		= iscsi_conn_get_param,
643 	.get_session_param	= iscsi_session_get_param,
644 	.start_conn             = iscsi_iser_conn_start,
645 	.stop_conn              = iscsi_iser_conn_stop,
646 	/* iscsi host params */
647 	.get_host_param		= iscsi_host_get_param,
648 	.set_host_param		= iscsi_host_set_param,
649 	/* IO */
650 	.send_pdu		= iscsi_conn_send_pdu,
651 	.get_stats		= iscsi_iser_conn_get_stats,
652 	.init_task		= iscsi_iser_task_init,
653 	.xmit_task		= iscsi_iser_task_xmit,
654 	.cleanup_task		= iscsi_iser_cleanup_task,
655 	.alloc_pdu		= iscsi_iser_pdu_alloc,
656 	/* recovery */
657 	.session_recovery_timedout = iscsi_session_recovery_timedout,
658 
659 	.ep_connect             = iscsi_iser_ep_connect,
660 	.ep_poll                = iscsi_iser_ep_poll,
661 	.ep_disconnect          = iscsi_iser_ep_disconnect
662 };
663 
664 static int __init iser_init(void)
665 {
666 	int err;
667 
668 	iser_dbg("Starting iSER datamover...\n");
669 
670 	if (iscsi_max_lun < 1) {
671 		printk(KERN_ERR "Invalid max_lun value of %u\n", iscsi_max_lun);
672 		return -EINVAL;
673 	}
674 
675 	memset(&ig, 0, sizeof(struct iser_global));
676 
677 	ig.desc_cache = kmem_cache_create("iser_descriptors",
678 					  sizeof (struct iser_desc),
679 					  0, SLAB_HWCACHE_ALIGN,
680 					  NULL);
681 	if (ig.desc_cache == NULL)
682 		return -ENOMEM;
683 
684 	/* device init is called only after the first addr resolution */
685 	mutex_init(&ig.device_list_mutex);
686 	INIT_LIST_HEAD(&ig.device_list);
687 	mutex_init(&ig.connlist_mutex);
688 	INIT_LIST_HEAD(&ig.connlist);
689 
690 	iscsi_iser_scsi_transport = iscsi_register_transport(
691 							&iscsi_iser_transport);
692 	if (!iscsi_iser_scsi_transport) {
693 		iser_err("iscsi_register_transport failed\n");
694 		err = -EINVAL;
695 		goto register_transport_failure;
696 	}
697 
698 	return 0;
699 
700 register_transport_failure:
701 	kmem_cache_destroy(ig.desc_cache);
702 
703 	return err;
704 }
705 
706 static void __exit iser_exit(void)
707 {
708 	iser_dbg("Removing iSER datamover...\n");
709 	iscsi_unregister_transport(&iscsi_iser_transport);
710 	kmem_cache_destroy(ig.desc_cache);
711 }
712 
713 module_init(iser_init);
714 module_exit(iser_exit);
715