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 #include <linux/slab.h>
60 
61 #include <net/sock.h>
62 
63 #include <asm/uaccess.h>
64 
65 #include <scsi/scsi_cmnd.h>
66 #include <scsi/scsi_device.h>
67 #include <scsi/scsi_eh.h>
68 #include <scsi/scsi_tcq.h>
69 #include <scsi/scsi_host.h>
70 #include <scsi/scsi.h>
71 #include <scsi/scsi_transport_iscsi.h>
72 
73 #include "iscsi_iser.h"
74 
75 static struct scsi_host_template iscsi_iser_sht;
76 static struct iscsi_transport iscsi_iser_transport;
77 static struct scsi_transport_template *iscsi_iser_scsi_transport;
78 
79 static unsigned int iscsi_max_lun = 512;
80 module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO);
81 
82 int iser_debug_level = 0;
83 
84 MODULE_DESCRIPTION("iSER (iSCSI Extensions for RDMA) Datamover "
85 		   "v" DRV_VER " (" DRV_DATE ")");
86 MODULE_LICENSE("Dual BSD/GPL");
87 MODULE_AUTHOR("Alex Nezhinsky, Dan Bar Dov, Or Gerlitz");
88 
89 module_param_named(debug_level, iser_debug_level, int, 0644);
90 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:disabled)");
91 
92 struct iser_global ig;
93 
94 void
95 iscsi_iser_recv(struct iscsi_conn *conn,
96 		struct iscsi_hdr *hdr, char *rx_data, int rx_data_len)
97 {
98 	int rc = 0;
99 	int datalen;
100 	int ahslen;
101 
102 	/* verify PDU length */
103 	datalen = ntoh24(hdr->dlength);
104 	if (datalen != rx_data_len) {
105 		printk(KERN_ERR "iscsi_iser: datalen %d (hdr) != %d (IB) \n",
106 		       datalen, rx_data_len);
107 		rc = ISCSI_ERR_DATALEN;
108 		goto error;
109 	}
110 
111 	/* read AHS */
112 	ahslen = hdr->hlength * 4;
113 
114 	rc = iscsi_complete_pdu(conn, hdr, rx_data, rx_data_len);
115 	if (rc && rc != ISCSI_ERR_NO_SCSI_CMD)
116 		goto error;
117 
118 	return;
119 error:
120 	iscsi_conn_failure(conn, rc);
121 }
122 
123 static int iscsi_iser_pdu_alloc(struct iscsi_task *task, uint8_t opcode)
124 {
125 	struct iscsi_iser_task *iser_task = task->dd_data;
126 
127 	task->hdr = (struct iscsi_hdr *)&iser_task->desc.iscsi_header;
128 	task->hdr_max = sizeof(iser_task->desc.iscsi_header);
129 	return 0;
130 }
131 
132 int iser_initialize_task_headers(struct iscsi_task *task,
133 						struct iser_tx_desc *tx_desc)
134 {
135 	struct iscsi_iser_conn *iser_conn = task->conn->dd_data;
136 	struct iser_device     *device    = iser_conn->ib_conn->device;
137 	struct iscsi_iser_task *iser_task = task->dd_data;
138 	u64 dma_addr;
139 
140 	dma_addr = ib_dma_map_single(device->ib_device, (void *)tx_desc,
141 				ISER_HEADERS_LEN, DMA_TO_DEVICE);
142 	if (ib_dma_mapping_error(device->ib_device, dma_addr))
143 		return -ENOMEM;
144 
145 	tx_desc->dma_addr = dma_addr;
146 	tx_desc->tx_sg[0].addr   = tx_desc->dma_addr;
147 	tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
148 	tx_desc->tx_sg[0].lkey   = device->mr->lkey;
149 
150 	iser_task->headers_initialized	= 1;
151 	iser_task->iser_conn		= iser_conn;
152 	return 0;
153 }
154 /**
155  * iscsi_iser_task_init - Initialize task
156  * @task: iscsi task
157  *
158  * Initialize the task for the scsi command or mgmt command.
159  */
160 static int
161 iscsi_iser_task_init(struct iscsi_task *task)
162 {
163 	struct iscsi_iser_task *iser_task = task->dd_data;
164 
165 	if (!iser_task->headers_initialized)
166 		if (iser_initialize_task_headers(task, &iser_task->desc))
167 			return -ENOMEM;
168 
169 	/* mgmt task */
170 	if (!task->sc)
171 		return 0;
172 
173 	iser_task->command_sent = 0;
174 	iser_task_rdma_init(iser_task);
175 	return 0;
176 }
177 
178 /**
179  * iscsi_iser_mtask_xmit - xmit management(immediate) task
180  * @conn: iscsi connection
181  * @task: task management task
182  *
183  * Notes:
184  *	The function can return -EAGAIN in which case caller must
185  *	call it again later, or recover. '0' return code means successful
186  *	xmit.
187  *
188  **/
189 static int
190 iscsi_iser_mtask_xmit(struct iscsi_conn *conn, struct iscsi_task *task)
191 {
192 	int error = 0;
193 
194 	iser_dbg("mtask xmit [cid %d itt 0x%x]\n", conn->id, task->itt);
195 
196 	error = iser_send_control(conn, task);
197 
198 	/* since iser xmits control with zero copy, tasks can not be recycled
199 	 * right after sending them.
200 	 * The recycling scheme is based on whether a response is expected
201 	 * - if yes, the task is recycled at iscsi_complete_pdu
202 	 * - if no,  the task is recycled at iser_snd_completion
203 	 */
204 	return error;
205 }
206 
207 static int
208 iscsi_iser_task_xmit_unsol_data(struct iscsi_conn *conn,
209 				 struct iscsi_task *task)
210 {
211 	struct iscsi_r2t_info *r2t = &task->unsol_r2t;
212 	struct iscsi_data hdr;
213 	int error = 0;
214 
215 	/* Send data-out PDUs while there's still unsolicited data to send */
216 	while (iscsi_task_has_unsol_data(task)) {
217 		iscsi_prep_data_out_pdu(task, r2t, &hdr);
218 		iser_dbg("Sending data-out: itt 0x%x, data count %d\n",
219 			   hdr.itt, r2t->data_count);
220 
221 		/* the buffer description has been passed with the command */
222 		/* Send the command */
223 		error = iser_send_data_out(conn, task, &hdr);
224 		if (error) {
225 			r2t->datasn--;
226 			goto iscsi_iser_task_xmit_unsol_data_exit;
227 		}
228 		r2t->sent += r2t->data_count;
229 		iser_dbg("Need to send %d more as data-out PDUs\n",
230 			   r2t->data_length - r2t->sent);
231 	}
232 
233 iscsi_iser_task_xmit_unsol_data_exit:
234 	return error;
235 }
236 
237 static int
238 iscsi_iser_task_xmit(struct iscsi_task *task)
239 {
240 	struct iscsi_conn *conn = task->conn;
241 	struct iscsi_iser_task *iser_task = task->dd_data;
242 	int error = 0;
243 
244 	if (!task->sc)
245 		return iscsi_iser_mtask_xmit(conn, task);
246 
247 	if (task->sc->sc_data_direction == DMA_TO_DEVICE) {
248 		BUG_ON(scsi_bufflen(task->sc) == 0);
249 
250 		iser_dbg("cmd [itt %x total %d imm %d unsol_data %d\n",
251 			   task->itt, scsi_bufflen(task->sc),
252 			   task->imm_count, task->unsol_r2t.data_length);
253 	}
254 
255 	iser_dbg("ctask xmit [cid %d itt 0x%x]\n",
256 		   conn->id, task->itt);
257 
258 	/* Send the cmd PDU */
259 	if (!iser_task->command_sent) {
260 		error = iser_send_command(conn, task);
261 		if (error)
262 			goto iscsi_iser_task_xmit_exit;
263 		iser_task->command_sent = 1;
264 	}
265 
266 	/* Send unsolicited data-out PDU(s) if necessary */
267 	if (iscsi_task_has_unsol_data(task))
268 		error = iscsi_iser_task_xmit_unsol_data(conn, task);
269 
270  iscsi_iser_task_xmit_exit:
271 	return error;
272 }
273 
274 static void iscsi_iser_cleanup_task(struct iscsi_task *task)
275 {
276 	struct iscsi_iser_task *iser_task = task->dd_data;
277 
278 	/* mgmt tasks do not need special cleanup */
279 	if (!task->sc)
280 		return;
281 
282 	if (iser_task->status == ISER_TASK_STATUS_STARTED) {
283 		iser_task->status = ISER_TASK_STATUS_COMPLETED;
284 		iser_task_rdma_finalize(iser_task);
285 	}
286 }
287 
288 static struct iscsi_cls_conn *
289 iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
290 {
291 	struct iscsi_conn *conn;
292 	struct iscsi_cls_conn *cls_conn;
293 	struct iscsi_iser_conn *iser_conn;
294 
295 	cls_conn = iscsi_conn_setup(cls_session, sizeof(*iser_conn), conn_idx);
296 	if (!cls_conn)
297 		return NULL;
298 	conn = cls_conn->dd_data;
299 
300 	/*
301 	 * due to issues with the login code re iser sematics
302 	 * this not set in iscsi_conn_setup - FIXME
303 	 */
304 	conn->max_recv_dlength = ISER_RECV_DATA_SEG_LEN;
305 
306 	iser_conn = conn->dd_data;
307 	conn->dd_data = iser_conn;
308 	iser_conn->iscsi_conn = conn;
309 
310 	return cls_conn;
311 }
312 
313 static void
314 iscsi_iser_conn_destroy(struct iscsi_cls_conn *cls_conn)
315 {
316 	struct iscsi_conn *conn = cls_conn->dd_data;
317 	struct iscsi_iser_conn *iser_conn = conn->dd_data;
318 	struct iser_conn *ib_conn = iser_conn->ib_conn;
319 
320 	iscsi_conn_teardown(cls_conn);
321 	/*
322 	 * Userspace will normally call the stop callback and
323 	 * already have freed the ib_conn, but if it goofed up then
324 	 * we free it here.
325 	 */
326 	if (ib_conn) {
327 		ib_conn->iser_conn = NULL;
328 		iser_conn_put(ib_conn, 1); /* deref iscsi/ib conn unbinding */
329 	}
330 }
331 
332 static int
333 iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session,
334 		     struct iscsi_cls_conn *cls_conn, uint64_t transport_eph,
335 		     int is_leading)
336 {
337 	struct iscsi_conn *conn = cls_conn->dd_data;
338 	struct iscsi_iser_conn *iser_conn;
339 	struct iser_conn *ib_conn;
340 	struct iscsi_endpoint *ep;
341 	int error;
342 
343 	error = iscsi_conn_bind(cls_session, cls_conn, is_leading);
344 	if (error)
345 		return error;
346 
347 	/* the transport ep handle comes from user space so it must be
348 	 * verified against the global ib connections list */
349 	ep = iscsi_lookup_endpoint(transport_eph);
350 	if (!ep) {
351 		iser_err("can't bind eph %llx\n",
352 			 (unsigned long long)transport_eph);
353 		return -EINVAL;
354 	}
355 	ib_conn = ep->dd_data;
356 
357 	/* binds the iSER connection retrieved from the previously
358 	 * connected ep_handle to the iSCSI layer connection. exchanges
359 	 * connection pointers */
360 	iser_err("binding iscsi/iser conn %p %p to ib_conn %p\n",
361 					conn, conn->dd_data, ib_conn);
362 	iser_conn = conn->dd_data;
363 	ib_conn->iser_conn = iser_conn;
364 	iser_conn->ib_conn  = ib_conn;
365 	iser_conn_get(ib_conn); /* ref iscsi/ib conn binding */
366 	return 0;
367 }
368 
369 static void
370 iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
371 {
372 	struct iscsi_conn *conn = cls_conn->dd_data;
373 	struct iscsi_iser_conn *iser_conn = conn->dd_data;
374 	struct iser_conn *ib_conn = iser_conn->ib_conn;
375 
376 	/*
377 	 * Userspace may have goofed up and not bound the connection or
378 	 * might have only partially setup the connection.
379 	 */
380 	if (ib_conn) {
381 		iscsi_conn_stop(cls_conn, flag);
382 		/*
383 		 * There is no unbind event so the stop callback
384 		 * must release the ref from the bind.
385 		 */
386 		iser_conn_put(ib_conn, 1); /* deref iscsi/ib conn unbinding */
387 	}
388 	iser_conn->ib_conn = NULL;
389 }
390 
391 static int
392 iscsi_iser_conn_start(struct iscsi_cls_conn *cls_conn)
393 {
394 	struct iscsi_conn *conn = cls_conn->dd_data;
395 	int err;
396 
397 	err = iser_conn_set_full_featured_mode(conn);
398 	if (err)
399 		return err;
400 
401 	return iscsi_conn_start(cls_conn);
402 }
403 
404 static void iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session)
405 {
406 	struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
407 
408 	iscsi_session_teardown(cls_session);
409 	iscsi_host_remove(shost);
410 	iscsi_host_free(shost);
411 }
412 
413 static struct iscsi_cls_session *
414 iscsi_iser_session_create(struct iscsi_endpoint *ep,
415 			  uint16_t cmds_max, uint16_t qdepth,
416 			  uint32_t initial_cmdsn)
417 {
418 	struct iscsi_cls_session *cls_session;
419 	struct iscsi_session *session;
420 	struct Scsi_Host *shost;
421 	struct iser_conn *ib_conn;
422 
423 	shost = iscsi_host_alloc(&iscsi_iser_sht, 0, 0);
424 	if (!shost)
425 		return NULL;
426 	shost->transportt = iscsi_iser_scsi_transport;
427 	shost->max_lun = iscsi_max_lun;
428 	shost->max_id = 0;
429 	shost->max_channel = 0;
430 	shost->max_cmd_len = 16;
431 
432 	/*
433 	 * older userspace tools (before 2.0-870) did not pass us
434 	 * the leading conn's ep so this will be NULL;
435 	 */
436 	if (ep)
437 		ib_conn = ep->dd_data;
438 
439 	if (iscsi_host_add(shost,
440 			   ep ? ib_conn->device->ib_device->dma_device : NULL))
441 		goto free_host;
442 
443 	/*
444 	 * we do not support setting can_queue cmd_per_lun from userspace yet
445 	 * because we preallocate so many resources
446 	 */
447 	cls_session = iscsi_session_setup(&iscsi_iser_transport, shost,
448 					  ISCSI_DEF_XMIT_CMDS_MAX, 0,
449 					  sizeof(struct iscsi_iser_task),
450 					  initial_cmdsn, 0);
451 	if (!cls_session)
452 		goto remove_host;
453 	session = cls_session->dd_data;
454 
455 	shost->can_queue = session->scsi_cmds_max;
456 	return cls_session;
457 
458 remove_host:
459 	iscsi_host_remove(shost);
460 free_host:
461 	iscsi_host_free(shost);
462 	return NULL;
463 }
464 
465 static int
466 iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn,
467 		     enum iscsi_param param, char *buf, int buflen)
468 {
469 	int value;
470 
471 	switch (param) {
472 	case ISCSI_PARAM_MAX_RECV_DLENGTH:
473 		/* TBD */
474 		break;
475 	case ISCSI_PARAM_HDRDGST_EN:
476 		sscanf(buf, "%d", &value);
477 		if (value) {
478 			printk(KERN_ERR "DataDigest wasn't negotiated to None");
479 			return -EPROTO;
480 		}
481 		break;
482 	case ISCSI_PARAM_DATADGST_EN:
483 		sscanf(buf, "%d", &value);
484 		if (value) {
485 			printk(KERN_ERR "DataDigest wasn't negotiated to None");
486 			return -EPROTO;
487 		}
488 		break;
489 	case ISCSI_PARAM_IFMARKER_EN:
490 		sscanf(buf, "%d", &value);
491 		if (value) {
492 			printk(KERN_ERR "IFMarker wasn't negotiated to No");
493 			return -EPROTO;
494 		}
495 		break;
496 	case ISCSI_PARAM_OFMARKER_EN:
497 		sscanf(buf, "%d", &value);
498 		if (value) {
499 			printk(KERN_ERR "OFMarker wasn't negotiated to No");
500 			return -EPROTO;
501 		}
502 		break;
503 	default:
504 		return iscsi_set_param(cls_conn, param, buf, buflen);
505 	}
506 
507 	return 0;
508 }
509 
510 static void
511 iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats)
512 {
513 	struct iscsi_conn *conn = cls_conn->dd_data;
514 
515 	stats->txdata_octets = conn->txdata_octets;
516 	stats->rxdata_octets = conn->rxdata_octets;
517 	stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
518 	stats->dataout_pdus = conn->dataout_pdus_cnt;
519 	stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
520 	stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */
521 	stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */
522 	stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
523 	stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
524 	stats->custom_length = 4;
525 	strcpy(stats->custom[0].desc, "qp_tx_queue_full");
526 	stats->custom[0].value = 0; /* TB iser_conn->qp_tx_queue_full; */
527 	strcpy(stats->custom[1].desc, "fmr_map_not_avail");
528 	stats->custom[1].value = 0; /* TB iser_conn->fmr_map_not_avail */;
529 	strcpy(stats->custom[2].desc, "eh_abort_cnt");
530 	stats->custom[2].value = conn->eh_abort_cnt;
531 	strcpy(stats->custom[3].desc, "fmr_unalign_cnt");
532 	stats->custom[3].value = conn->fmr_unalign_cnt;
533 }
534 
535 static struct iscsi_endpoint *
536 iscsi_iser_ep_connect(struct Scsi_Host *shost, struct sockaddr *dst_addr,
537 		      int non_blocking)
538 {
539 	int err;
540 	struct iser_conn *ib_conn;
541 	struct iscsi_endpoint *ep;
542 
543 	ep = iscsi_create_endpoint(sizeof(*ib_conn));
544 	if (!ep)
545 		return ERR_PTR(-ENOMEM);
546 
547 	ib_conn = ep->dd_data;
548 	ib_conn->ep = ep;
549 	iser_conn_init(ib_conn);
550 
551 	err = iser_connect(ib_conn, NULL, (struct sockaddr_in *)dst_addr,
552 			   non_blocking);
553 	if (err) {
554 		iscsi_destroy_endpoint(ep);
555 		return ERR_PTR(err);
556 	}
557 	return ep;
558 }
559 
560 static int
561 iscsi_iser_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
562 {
563 	struct iser_conn *ib_conn;
564 	int rc;
565 
566 	ib_conn = ep->dd_data;
567 	rc = wait_event_interruptible_timeout(ib_conn->wait,
568 			     ib_conn->state == ISER_CONN_UP,
569 			     msecs_to_jiffies(timeout_ms));
570 
571 	/* if conn establishment failed, return error code to iscsi */
572 	if (!rc &&
573 	    (ib_conn->state == ISER_CONN_TERMINATING ||
574 	     ib_conn->state == ISER_CONN_DOWN))
575 		rc = -1;
576 
577 	iser_err("ib conn %p rc = %d\n", ib_conn, rc);
578 
579 	if (rc > 0)
580 		return 1; /* success, this is the equivalent of POLLOUT */
581 	else if (!rc)
582 		return 0; /* timeout */
583 	else
584 		return rc; /* signal */
585 }
586 
587 static void
588 iscsi_iser_ep_disconnect(struct iscsi_endpoint *ep)
589 {
590 	struct iser_conn *ib_conn;
591 
592 	ib_conn = ep->dd_data;
593 	if (ib_conn->iser_conn)
594 		/*
595 		 * Must suspend xmit path if the ep is bound to the
596 		 * iscsi_conn, so we know we are not accessing the ib_conn
597 		 * when we free it.
598 		 *
599 		 * This may not be bound if the ep poll failed.
600 		 */
601 		iscsi_suspend_tx(ib_conn->iser_conn->iscsi_conn);
602 
603 
604 	iser_err("ib conn %p state %d\n",ib_conn, ib_conn->state);
605 	iser_conn_terminate(ib_conn);
606 }
607 
608 static struct scsi_host_template iscsi_iser_sht = {
609 	.module                 = THIS_MODULE,
610 	.name                   = "iSCSI Initiator over iSER, v." DRV_VER,
611 	.queuecommand           = iscsi_queuecommand,
612 	.change_queue_depth	= iscsi_change_queue_depth,
613 	.sg_tablesize           = ISCSI_ISER_SG_TABLESIZE,
614 	.max_sectors		= 1024,
615 	.cmd_per_lun            = ISER_DEF_CMD_PER_LUN,
616 	.eh_abort_handler       = iscsi_eh_abort,
617 	.eh_device_reset_handler= iscsi_eh_device_reset,
618 	.eh_target_reset_handler = iscsi_eh_recover_target,
619 	.target_alloc		= iscsi_target_alloc,
620 	.use_clustering         = DISABLE_CLUSTERING,
621 	.proc_name              = "iscsi_iser",
622 	.this_id                = -1,
623 };
624 
625 static struct iscsi_transport iscsi_iser_transport = {
626 	.owner                  = THIS_MODULE,
627 	.name                   = "iser",
628 	.caps                   = CAP_RECOVERY_L0 | CAP_MULTI_R2T,
629 	.param_mask		= ISCSI_MAX_RECV_DLENGTH |
630 				  ISCSI_MAX_XMIT_DLENGTH |
631 				  ISCSI_HDRDGST_EN |
632 				  ISCSI_DATADGST_EN |
633 				  ISCSI_INITIAL_R2T_EN |
634 				  ISCSI_MAX_R2T |
635 				  ISCSI_IMM_DATA_EN |
636 				  ISCSI_FIRST_BURST |
637 				  ISCSI_MAX_BURST |
638 				  ISCSI_PDU_INORDER_EN |
639 				  ISCSI_DATASEQ_INORDER_EN |
640 				  ISCSI_EXP_STATSN |
641 				  ISCSI_PERSISTENT_PORT |
642 				  ISCSI_PERSISTENT_ADDRESS |
643 				  ISCSI_TARGET_NAME | ISCSI_TPGT |
644 				  ISCSI_USERNAME | ISCSI_PASSWORD |
645 				  ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN |
646 				  ISCSI_FAST_ABORT | ISCSI_ABORT_TMO |
647 				  ISCSI_LU_RESET_TMO | ISCSI_TGT_RESET_TMO |
648 				  ISCSI_PING_TMO | ISCSI_RECV_TMO |
649 				  ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME,
650 	.host_param_mask	= ISCSI_HOST_HWADDRESS |
651 				  ISCSI_HOST_NETDEV_NAME |
652 				  ISCSI_HOST_INITIATOR_NAME,
653 	/* session management */
654 	.create_session         = iscsi_iser_session_create,
655 	.destroy_session        = iscsi_iser_session_destroy,
656 	/* connection management */
657 	.create_conn            = iscsi_iser_conn_create,
658 	.bind_conn              = iscsi_iser_conn_bind,
659 	.destroy_conn           = iscsi_iser_conn_destroy,
660 	.set_param              = iscsi_iser_set_param,
661 	.get_conn_param		= iscsi_conn_get_param,
662 	.get_session_param	= iscsi_session_get_param,
663 	.start_conn             = iscsi_iser_conn_start,
664 	.stop_conn              = iscsi_iser_conn_stop,
665 	/* iscsi host params */
666 	.get_host_param		= iscsi_host_get_param,
667 	.set_host_param		= iscsi_host_set_param,
668 	/* IO */
669 	.send_pdu		= iscsi_conn_send_pdu,
670 	.get_stats		= iscsi_iser_conn_get_stats,
671 	.init_task		= iscsi_iser_task_init,
672 	.xmit_task		= iscsi_iser_task_xmit,
673 	.cleanup_task		= iscsi_iser_cleanup_task,
674 	.alloc_pdu		= iscsi_iser_pdu_alloc,
675 	/* recovery */
676 	.session_recovery_timedout = iscsi_session_recovery_timedout,
677 
678 	.ep_connect             = iscsi_iser_ep_connect,
679 	.ep_poll                = iscsi_iser_ep_poll,
680 	.ep_disconnect          = iscsi_iser_ep_disconnect
681 };
682 
683 static int __init iser_init(void)
684 {
685 	int err;
686 
687 	iser_dbg("Starting iSER datamover...\n");
688 
689 	if (iscsi_max_lun < 1) {
690 		printk(KERN_ERR "Invalid max_lun value of %u\n", iscsi_max_lun);
691 		return -EINVAL;
692 	}
693 
694 	memset(&ig, 0, sizeof(struct iser_global));
695 
696 	ig.desc_cache = kmem_cache_create("iser_descriptors",
697 					  sizeof(struct iser_tx_desc),
698 					  0, SLAB_HWCACHE_ALIGN,
699 					  NULL);
700 	if (ig.desc_cache == NULL)
701 		return -ENOMEM;
702 
703 	/* device init is called only after the first addr resolution */
704 	mutex_init(&ig.device_list_mutex);
705 	INIT_LIST_HEAD(&ig.device_list);
706 	mutex_init(&ig.connlist_mutex);
707 	INIT_LIST_HEAD(&ig.connlist);
708 
709 	iscsi_iser_scsi_transport = iscsi_register_transport(
710 							&iscsi_iser_transport);
711 	if (!iscsi_iser_scsi_transport) {
712 		iser_err("iscsi_register_transport failed\n");
713 		err = -EINVAL;
714 		goto register_transport_failure;
715 	}
716 
717 	return 0;
718 
719 register_transport_failure:
720 	kmem_cache_destroy(ig.desc_cache);
721 
722 	return err;
723 }
724 
725 static void __exit iser_exit(void)
726 {
727 	iser_dbg("Removing iSER datamover...\n");
728 	iscsi_unregister_transport(&iscsi_iser_transport);
729 	kmem_cache_destroy(ig.desc_cache);
730 }
731 
732 module_init(iser_init);
733 module_exit(iser_exit);
734