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 
123 /**
124  * iscsi_iser_task_init - Initialize task
125  * @task: iscsi task
126  *
127  * Initialize the task for the scsi command or mgmt command.
128  */
129 static int
130 iscsi_iser_task_init(struct iscsi_task *task)
131 {
132 	struct iscsi_iser_conn *iser_conn  = task->conn->dd_data;
133 	struct iscsi_iser_task *iser_task = task->dd_data;
134 
135 	/* mgmt task */
136 	if (!task->sc) {
137 		iser_task->desc.data = task->data;
138 		return 0;
139 	}
140 
141 	iser_task->command_sent = 0;
142 	iser_task->iser_conn    = iser_conn;
143 	iser_task_rdma_init(iser_task);
144 	return 0;
145 }
146 
147 /**
148  * iscsi_iser_mtask_xmit - xmit management(immediate) task
149  * @conn: iscsi connection
150  * @task: task management task
151  *
152  * Notes:
153  *	The function can return -EAGAIN in which case caller must
154  *	call it again later, or recover. '0' return code means successful
155  *	xmit.
156  *
157  **/
158 static int
159 iscsi_iser_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task)
160 {
161 	int error = 0;
162 
163 	debug_scsi("task deq [cid %d itt 0x%x]\n", conn->id, task->itt);
164 
165 	error = iser_send_control(conn, task);
166 
167 	/* since iser xmits control with zero copy, tasks can not be recycled
168 	 * right after sending them.
169 	 * The recycling scheme is based on whether a response is expected
170 	 * - if yes, the task is recycled at iscsi_complete_pdu
171 	 * - if no,  the task is recycled at iser_snd_completion
172 	 */
173 	if (error && error != -ENOBUFS)
174 		iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
175 
176 	return error;
177 }
178 
179 static int
180 iscsi_iser_task_xmit_unsol_data(struct iscsi_conn *conn,
181 				 struct iscsi_task *task)
182 {
183 	struct iscsi_data  hdr;
184 	int error = 0;
185 
186 	/* Send data-out PDUs while there's still unsolicited data to send */
187 	while (task->unsol_count > 0) {
188 		iscsi_prep_unsolicit_data_pdu(task, &hdr);
189 		debug_scsi("Sending data-out: itt 0x%x, data count %d\n",
190 			   hdr.itt, task->data_count);
191 
192 		/* the buffer description has been passed with the command */
193 		/* Send the command */
194 		error = iser_send_data_out(conn, task, &hdr);
195 		if (error) {
196 			task->unsol_datasn--;
197 			goto iscsi_iser_task_xmit_unsol_data_exit;
198 		}
199 		task->unsol_count -= task->data_count;
200 		debug_scsi("Need to send %d more as data-out PDUs\n",
201 			   task->unsol_count);
202 	}
203 
204 iscsi_iser_task_xmit_unsol_data_exit:
205 	return error;
206 }
207 
208 static int
209 iscsi_iser_task_xmit(struct iscsi_task *task)
210 {
211 	struct iscsi_conn *conn = task->conn;
212 	struct iscsi_iser_task *iser_task = task->dd_data;
213 	int error = 0;
214 
215 	if (!task->sc)
216 		return iscsi_iser_mtask_xmit(conn, task);
217 
218 	if (task->sc->sc_data_direction == DMA_TO_DEVICE) {
219 		BUG_ON(scsi_bufflen(task->sc) == 0);
220 
221 		debug_scsi("cmd [itt %x total %d imm %d unsol_data %d\n",
222 			   task->itt, scsi_bufflen(task->sc),
223 			   task->imm_count, task->unsol_count);
224 	}
225 
226 	debug_scsi("task deq [cid %d itt 0x%x]\n",
227 		   conn->id, task->itt);
228 
229 	/* Send the cmd PDU */
230 	if (!iser_task->command_sent) {
231 		error = iser_send_command(conn, task);
232 		if (error)
233 			goto iscsi_iser_task_xmit_exit;
234 		iser_task->command_sent = 1;
235 	}
236 
237 	/* Send unsolicited data-out PDU(s) if necessary */
238 	if (task->unsol_count)
239 		error = iscsi_iser_task_xmit_unsol_data(conn, task);
240 
241  iscsi_iser_task_xmit_exit:
242 	if (error && error != -ENOBUFS)
243 		iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
244 	return error;
245 }
246 
247 static void
248 iscsi_iser_cleanup_task(struct iscsi_conn *conn, struct iscsi_task *task)
249 {
250 	struct iscsi_iser_task *iser_task = task->dd_data;
251 
252 	/* mgmt tasks do not need special cleanup */
253 	if (!task->sc)
254 		return;
255 
256 	if (iser_task->status == ISER_TASK_STATUS_STARTED) {
257 		iser_task->status = ISER_TASK_STATUS_COMPLETED;
258 		iser_task_rdma_finalize(iser_task);
259 	}
260 }
261 
262 static struct iscsi_cls_conn *
263 iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
264 {
265 	struct iscsi_conn *conn;
266 	struct iscsi_cls_conn *cls_conn;
267 	struct iscsi_iser_conn *iser_conn;
268 
269 	cls_conn = iscsi_conn_setup(cls_session, sizeof(*iser_conn), conn_idx);
270 	if (!cls_conn)
271 		return NULL;
272 	conn = cls_conn->dd_data;
273 
274 	/*
275 	 * due to issues with the login code re iser sematics
276 	 * this not set in iscsi_conn_setup - FIXME
277 	 */
278 	conn->max_recv_dlength = 128;
279 
280 	iser_conn = conn->dd_data;
281 	conn->dd_data = iser_conn;
282 	iser_conn->iscsi_conn = conn;
283 
284 	return cls_conn;
285 }
286 
287 static void
288 iscsi_iser_conn_destroy(struct iscsi_cls_conn *cls_conn)
289 {
290 	struct iscsi_conn *conn = cls_conn->dd_data;
291 	struct iscsi_iser_conn *iser_conn = conn->dd_data;
292 	struct iser_conn *ib_conn = iser_conn->ib_conn;
293 
294 	iscsi_conn_teardown(cls_conn);
295 	/*
296 	 * Userspace will normally call the stop callback and
297 	 * already have freed the ib_conn, but if it goofed up then
298 	 * we free it here.
299 	 */
300 	if (ib_conn) {
301 		ib_conn->iser_conn = NULL;
302 		iser_conn_put(ib_conn);
303 	}
304 }
305 
306 static int
307 iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session,
308 		     struct iscsi_cls_conn *cls_conn, uint64_t transport_eph,
309 		     int is_leading)
310 {
311 	struct iscsi_conn *conn = cls_conn->dd_data;
312 	struct iscsi_iser_conn *iser_conn;
313 	struct iser_conn *ib_conn;
314 	struct iscsi_endpoint *ep;
315 	int error;
316 
317 	error = iscsi_conn_bind(cls_session, cls_conn, is_leading);
318 	if (error)
319 		return error;
320 
321 	/* the transport ep handle comes from user space so it must be
322 	 * verified against the global ib connections list */
323 	ep = iscsi_lookup_endpoint(transport_eph);
324 	if (!ep) {
325 		iser_err("can't bind eph %llx\n",
326 			 (unsigned long long)transport_eph);
327 		return -EINVAL;
328 	}
329 	ib_conn = ep->dd_data;
330 
331 	/* binds the iSER connection retrieved from the previously
332 	 * connected ep_handle to the iSCSI layer connection. exchanges
333 	 * connection pointers */
334 	iser_err("binding iscsi conn %p to iser_conn %p\n",conn,ib_conn);
335 	iser_conn = conn->dd_data;
336 	ib_conn->iser_conn = iser_conn;
337 	iser_conn->ib_conn  = ib_conn;
338 	iser_conn_get(ib_conn);
339 	return 0;
340 }
341 
342 static void
343 iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
344 {
345 	struct iscsi_conn *conn = cls_conn->dd_data;
346 	struct iscsi_iser_conn *iser_conn = conn->dd_data;
347 	struct iser_conn *ib_conn = iser_conn->ib_conn;
348 
349 	/*
350 	 * Userspace may have goofed up and not bound the connection or
351 	 * might have only partially setup the connection.
352 	 */
353 	if (ib_conn) {
354 		iscsi_conn_stop(cls_conn, flag);
355 		/*
356 		 * There is no unbind event so the stop callback
357 		 * must release the ref from the bind.
358 		 */
359 		iser_conn_put(ib_conn);
360 	}
361 	iser_conn->ib_conn = NULL;
362 }
363 
364 static int
365 iscsi_iser_conn_start(struct iscsi_cls_conn *cls_conn)
366 {
367 	struct iscsi_conn *conn = cls_conn->dd_data;
368 	int err;
369 
370 	err = iser_conn_set_full_featured_mode(conn);
371 	if (err)
372 		return err;
373 
374 	return iscsi_conn_start(cls_conn);
375 }
376 
377 static void iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session)
378 {
379 	struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
380 
381 	iscsi_host_remove(shost);
382 	iscsi_host_free(shost);
383 }
384 
385 static struct iscsi_cls_session *
386 iscsi_iser_session_create(struct iscsi_endpoint *ep,
387 			  uint16_t cmds_max, uint16_t qdepth,
388 			  uint32_t initial_cmdsn, uint32_t *hostno)
389 {
390 	struct iscsi_cls_session *cls_session;
391 	struct iscsi_session *session;
392 	struct Scsi_Host *shost;
393 	int i;
394 	struct iscsi_task *task;
395 	struct iscsi_iser_task *iser_task;
396 	struct iser_conn *ib_conn;
397 
398 	shost = iscsi_host_alloc(&iscsi_iser_sht, 0, ISCSI_MAX_CMD_PER_LUN);
399 	if (!shost)
400 		return NULL;
401 	shost->transportt = iscsi_iser_scsi_transport;
402 	shost->max_lun = iscsi_max_lun;
403 	shost->max_id = 0;
404 	shost->max_channel = 0;
405 	shost->max_cmd_len = 16;
406 
407 	/*
408 	 * older userspace tools (before 2.0-870) did not pass us
409 	 * the leading conn's ep so this will be NULL;
410 	 */
411 	if (ep)
412 		ib_conn = ep->dd_data;
413 
414 	if (iscsi_host_add(shost,
415 			   ep ? ib_conn->device->ib_device->dma_device : NULL))
416 		goto free_host;
417 	*hostno = shost->host_no;
418 
419 	/*
420 	 * we do not support setting can_queue cmd_per_lun from userspace yet
421 	 * because we preallocate so many resources
422 	 */
423 	cls_session = iscsi_session_setup(&iscsi_iser_transport, shost,
424 					  ISCSI_DEF_XMIT_CMDS_MAX,
425 					  sizeof(struct iscsi_iser_task),
426 					  initial_cmdsn, 0);
427 	if (!cls_session)
428 		goto remove_host;
429 	session = cls_session->dd_data;
430 
431 	shost->can_queue = session->scsi_cmds_max;
432 	/* libiscsi setup itts, data and pool so just set desc fields */
433 	for (i = 0; i < session->cmds_max; i++) {
434 		task = session->cmds[i];
435 		iser_task = task->dd_data;
436 		task->hdr = (struct iscsi_cmd *)&iser_task->desc.iscsi_header;
437 		task->hdr_max = sizeof(iser_task->desc.iscsi_header);
438 	}
439 	return cls_session;
440 
441 remove_host:
442 	iscsi_host_remove(shost);
443 free_host:
444 	iscsi_host_free(shost);
445 	return NULL;
446 }
447 
448 static int
449 iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn,
450 		     enum iscsi_param param, char *buf, int buflen)
451 {
452 	int value;
453 
454 	switch (param) {
455 	case ISCSI_PARAM_MAX_RECV_DLENGTH:
456 		/* TBD */
457 		break;
458 	case ISCSI_PARAM_HDRDGST_EN:
459 		sscanf(buf, "%d", &value);
460 		if (value) {
461 			printk(KERN_ERR "DataDigest wasn't negotiated to None");
462 			return -EPROTO;
463 		}
464 		break;
465 	case ISCSI_PARAM_DATADGST_EN:
466 		sscanf(buf, "%d", &value);
467 		if (value) {
468 			printk(KERN_ERR "DataDigest wasn't negotiated to None");
469 			return -EPROTO;
470 		}
471 		break;
472 	case ISCSI_PARAM_IFMARKER_EN:
473 		sscanf(buf, "%d", &value);
474 		if (value) {
475 			printk(KERN_ERR "IFMarker wasn't negotiated to No");
476 			return -EPROTO;
477 		}
478 		break;
479 	case ISCSI_PARAM_OFMARKER_EN:
480 		sscanf(buf, "%d", &value);
481 		if (value) {
482 			printk(KERN_ERR "OFMarker wasn't negotiated to No");
483 			return -EPROTO;
484 		}
485 		break;
486 	default:
487 		return iscsi_set_param(cls_conn, param, buf, buflen);
488 	}
489 
490 	return 0;
491 }
492 
493 static void
494 iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats)
495 {
496 	struct iscsi_conn *conn = cls_conn->dd_data;
497 
498 	stats->txdata_octets = conn->txdata_octets;
499 	stats->rxdata_octets = conn->rxdata_octets;
500 	stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
501 	stats->dataout_pdus = conn->dataout_pdus_cnt;
502 	stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
503 	stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */
504 	stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */
505 	stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
506 	stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
507 	stats->custom_length = 4;
508 	strcpy(stats->custom[0].desc, "qp_tx_queue_full");
509 	stats->custom[0].value = 0; /* TB iser_conn->qp_tx_queue_full; */
510 	strcpy(stats->custom[1].desc, "fmr_map_not_avail");
511 	stats->custom[1].value = 0; /* TB iser_conn->fmr_map_not_avail */;
512 	strcpy(stats->custom[2].desc, "eh_abort_cnt");
513 	stats->custom[2].value = conn->eh_abort_cnt;
514 	strcpy(stats->custom[3].desc, "fmr_unalign_cnt");
515 	stats->custom[3].value = conn->fmr_unalign_cnt;
516 }
517 
518 static struct iscsi_endpoint *
519 iscsi_iser_ep_connect(struct sockaddr *dst_addr, int non_blocking)
520 {
521 	int err;
522 	struct iser_conn *ib_conn;
523 	struct iscsi_endpoint *ep;
524 
525 	ep = iscsi_create_endpoint(sizeof(*ib_conn));
526 	if (!ep)
527 		return ERR_PTR(-ENOMEM);
528 
529 	ib_conn = ep->dd_data;
530 	ib_conn->ep = ep;
531 	iser_conn_init(ib_conn);
532 
533 	err = iser_connect(ib_conn, NULL, (struct sockaddr_in *)dst_addr,
534 			   non_blocking);
535 	if (err) {
536 		iscsi_destroy_endpoint(ep);
537 		return ERR_PTR(err);
538 	}
539 	return ep;
540 }
541 
542 static int
543 iscsi_iser_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
544 {
545 	struct iser_conn *ib_conn;
546 	int rc;
547 
548 	ib_conn = ep->dd_data;
549 	rc = wait_event_interruptible_timeout(ib_conn->wait,
550 			     ib_conn->state == ISER_CONN_UP,
551 			     msecs_to_jiffies(timeout_ms));
552 
553 	/* if conn establishment failed, return error code to iscsi */
554 	if (!rc &&
555 	    (ib_conn->state == ISER_CONN_TERMINATING ||
556 	     ib_conn->state == ISER_CONN_DOWN))
557 		rc = -1;
558 
559 	iser_err("ib conn %p rc = %d\n", ib_conn, rc);
560 
561 	if (rc > 0)
562 		return 1; /* success, this is the equivalent of POLLOUT */
563 	else if (!rc)
564 		return 0; /* timeout */
565 	else
566 		return rc; /* signal */
567 }
568 
569 static void
570 iscsi_iser_ep_disconnect(struct iscsi_endpoint *ep)
571 {
572 	struct iser_conn *ib_conn;
573 
574 	ib_conn = ep->dd_data;
575 	if (ib_conn->iser_conn)
576 		/*
577 		 * Must suspend xmit path if the ep is bound to the
578 		 * iscsi_conn, so we know we are not accessing the ib_conn
579 		 * when we free it.
580 		 *
581 		 * This may not be bound if the ep poll failed.
582 		 */
583 		iscsi_suspend_tx(ib_conn->iser_conn->iscsi_conn);
584 
585 
586 	iser_err("ib conn %p state %d\n",ib_conn, ib_conn->state);
587 	iser_conn_terminate(ib_conn);
588 }
589 
590 static struct scsi_host_template iscsi_iser_sht = {
591 	.module                 = THIS_MODULE,
592 	.name                   = "iSCSI Initiator over iSER, v." DRV_VER,
593 	.queuecommand           = iscsi_queuecommand,
594 	.change_queue_depth	= iscsi_change_queue_depth,
595 	.sg_tablesize           = ISCSI_ISER_SG_TABLESIZE,
596 	.max_sectors		= 1024,
597 	.cmd_per_lun            = ISCSI_MAX_CMD_PER_LUN,
598 	.eh_abort_handler       = iscsi_eh_abort,
599 	.eh_device_reset_handler= iscsi_eh_device_reset,
600 	.eh_host_reset_handler	= iscsi_eh_host_reset,
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_PING_TMO | ISCSI_RECV_TMO |
629 				  ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME,
630 	.host_param_mask	= ISCSI_HOST_HWADDRESS |
631 				  ISCSI_HOST_NETDEV_NAME |
632 				  ISCSI_HOST_INITIATOR_NAME,
633 	/* session management */
634 	.create_session         = iscsi_iser_session_create,
635 	.destroy_session        = iscsi_iser_session_destroy,
636 	/* connection management */
637 	.create_conn            = iscsi_iser_conn_create,
638 	.bind_conn              = iscsi_iser_conn_bind,
639 	.destroy_conn           = iscsi_iser_conn_destroy,
640 	.set_param              = iscsi_iser_set_param,
641 	.get_conn_param		= iscsi_conn_get_param,
642 	.get_session_param	= iscsi_session_get_param,
643 	.start_conn             = iscsi_iser_conn_start,
644 	.stop_conn              = iscsi_iser_conn_stop,
645 	/* iscsi host params */
646 	.get_host_param		= iscsi_host_get_param,
647 	.set_host_param		= iscsi_host_set_param,
648 	/* IO */
649 	.send_pdu		= iscsi_conn_send_pdu,
650 	.get_stats		= iscsi_iser_conn_get_stats,
651 	.init_task		= iscsi_iser_task_init,
652 	.xmit_task		= iscsi_iser_task_xmit,
653 	.cleanup_task		= iscsi_iser_cleanup_task,
654 	/* recovery */
655 	.session_recovery_timedout = iscsi_session_recovery_timedout,
656 
657 	.ep_connect             = iscsi_iser_ep_connect,
658 	.ep_poll                = iscsi_iser_ep_poll,
659 	.ep_disconnect          = iscsi_iser_ep_disconnect
660 };
661 
662 static int __init iser_init(void)
663 {
664 	int err;
665 
666 	iser_dbg("Starting iSER datamover...\n");
667 
668 	if (iscsi_max_lun < 1) {
669 		printk(KERN_ERR "Invalid max_lun value of %u\n", iscsi_max_lun);
670 		return -EINVAL;
671 	}
672 
673 	memset(&ig, 0, sizeof(struct iser_global));
674 
675 	ig.desc_cache = kmem_cache_create("iser_descriptors",
676 					  sizeof (struct iser_desc),
677 					  0, SLAB_HWCACHE_ALIGN,
678 					  NULL);
679 	if (ig.desc_cache == NULL)
680 		return -ENOMEM;
681 
682 	/* device init is called only after the first addr resolution */
683 	mutex_init(&ig.device_list_mutex);
684 	INIT_LIST_HEAD(&ig.device_list);
685 	mutex_init(&ig.connlist_mutex);
686 	INIT_LIST_HEAD(&ig.connlist);
687 
688 	iscsi_iser_scsi_transport = iscsi_register_transport(
689 							&iscsi_iser_transport);
690 	if (!iscsi_iser_scsi_transport) {
691 		iser_err("iscsi_register_transport failed\n");
692 		err = -EINVAL;
693 		goto register_transport_failure;
694 	}
695 
696 	return 0;
697 
698 register_transport_failure:
699 	kmem_cache_destroy(ig.desc_cache);
700 
701 	return err;
702 }
703 
704 static void __exit iser_exit(void)
705 {
706 	iser_dbg("Removing iSER datamover...\n");
707 	iscsi_unregister_transport(&iscsi_iser_transport);
708 	kmem_cache_destroy(ig.desc_cache);
709 }
710 
711 module_init(iser_init);
712 module_exit(iser_exit);
713