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-rw-r--r--drivers/infiniband/ulp/iser/iscsi_iser.c790
1 files changed, 790 insertions, 0 deletions
diff --git a/drivers/infiniband/ulp/iser/iscsi_iser.c b/drivers/infiniband/ulp/iser/iscsi_iser.c
new file mode 100644
index 000000000000..4c3f2de2a06e
--- /dev/null
+++ b/drivers/infiniband/ulp/iser/iscsi_iser.c
@@ -0,0 +1,790 @@
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 * $Id: iscsi_iser.c 6965 2006-05-07 11:36:20Z ogerlitz $
48 */
49
50#include <linux/types.h>
51#include <linux/list.h>
52#include <linux/hardirq.h>
53#include <linux/kfifo.h>
54#include <linux/blkdev.h>
55#include <linux/init.h>
56#include <linux/ioctl.h>
57#include <linux/devfs_fs_kernel.h>
58#include <linux/cdev.h>
59#include <linux/in.h>
60#include <linux/net.h>
61#include <linux/scatterlist.h>
62#include <linux/delay.h>
63
64#include <net/sock.h>
65
66#include <asm/uaccess.h>
67
68#include <scsi/scsi_cmnd.h>
69#include <scsi/scsi_device.h>
70#include <scsi/scsi_eh.h>
71#include <scsi/scsi_tcq.h>
72#include <scsi/scsi_host.h>
73#include <scsi/scsi.h>
74#include <scsi/scsi_transport_iscsi.h>
75
76#include "iscsi_iser.h"
77
78static unsigned int iscsi_max_lun = 512;
79module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO);
80
81int iser_debug_level = 0;
82
83MODULE_DESCRIPTION("iSER (iSCSI Extensions for RDMA) Datamover "
84 "v" DRV_VER " (" DRV_DATE ")");
85MODULE_LICENSE("Dual BSD/GPL");
86MODULE_AUTHOR("Alex Nezhinsky, Dan Bar Dov, Or Gerlitz");
87
88module_param_named(debug_level, iser_debug_level, int, 0644);
89MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:disabled)");
90
91struct iser_global ig;
92
93void
94iscsi_iser_recv(struct iscsi_conn *conn,
95 struct iscsi_hdr *hdr, char *rx_data, int rx_data_len)
96{
97 int rc = 0;
98 uint32_t ret_itt;
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 /* verify itt (itt encoding: age+cid+itt) */
115 rc = iscsi_verify_itt(conn, hdr, &ret_itt);
116
117 if (!rc)
118 rc = iscsi_complete_pdu(conn, hdr, rx_data, rx_data_len);
119
120 if (rc && rc != ISCSI_ERR_NO_SCSI_CMD)
121 goto error;
122
123 return;
124error:
125 iscsi_conn_failure(conn, rc);
126}
127
128
129/**
130 * iscsi_iser_cmd_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands
131 *
132 **/
133static void
134iscsi_iser_cmd_init(struct iscsi_cmd_task *ctask)
135{
136 struct iscsi_iser_conn *iser_conn = ctask->conn->dd_data;
137 struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data;
138 struct scsi_cmnd *sc = ctask->sc;
139
140 iser_ctask->command_sent = 0;
141 iser_ctask->iser_conn = iser_conn;
142
143 if (sc->sc_data_direction == DMA_TO_DEVICE) {
144 BUG_ON(ctask->total_length == 0);
145 /* bytes to be sent via RDMA operations */
146 iser_ctask->rdma_data_count = ctask->total_length -
147 ctask->imm_count -
148 ctask->unsol_count;
149
150 debug_scsi("cmd [itt %x total %d imm %d unsol_data %d "
151 "rdma_data %d]\n",
152 ctask->itt, ctask->total_length, ctask->imm_count,
153 ctask->unsol_count, iser_ctask->rdma_data_count);
154 } else
155 /* bytes to be sent via RDMA operations */
156 iser_ctask->rdma_data_count = ctask->total_length;
157
158 iser_ctask_rdma_init(iser_ctask);
159}
160
161/**
162 * iscsi_mtask_xmit - xmit management(immediate) task
163 * @conn: iscsi connection
164 * @mtask: task management task
165 *
166 * Notes:
167 * The function can return -EAGAIN in which case caller must
168 * call it again later, or recover. '0' return code means successful
169 * xmit.
170 *
171 **/
172static int
173iscsi_iser_mtask_xmit(struct iscsi_conn *conn,
174 struct iscsi_mgmt_task *mtask)
175{
176 int error = 0;
177
178 debug_scsi("mtask deq [cid %d itt 0x%x]\n", conn->id, mtask->itt);
179
180 error = iser_send_control(conn, mtask);
181
182 /* since iser xmits control with zero copy, mtasks can not be recycled
183 * right after sending them.
184 * The recycling scheme is based on whether a response is expected
185 * - if yes, the mtask is recycled at iscsi_complete_pdu
186 * - if no, the mtask is recycled at iser_snd_completion
187 */
188 if (error && error != -EAGAIN)
189 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
190
191 return error;
192}
193
194static int
195iscsi_iser_ctask_xmit_unsol_data(struct iscsi_conn *conn,
196 struct iscsi_cmd_task *ctask)
197{
198 struct iscsi_data hdr;
199 int error = 0;
200 struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data;
201
202 /* Send data-out PDUs while there's still unsolicited data to send */
203 while (ctask->unsol_count > 0) {
204 iscsi_prep_unsolicit_data_pdu(ctask, &hdr,
205 iser_ctask->rdma_data_count);
206
207 debug_scsi("Sending data-out: itt 0x%x, data count %d\n",
208 hdr.itt, ctask->data_count);
209
210 /* the buffer description has been passed with the command */
211 /* Send the command */
212 error = iser_send_data_out(conn, ctask, &hdr);
213 if (error) {
214 ctask->unsol_datasn--;
215 goto iscsi_iser_ctask_xmit_unsol_data_exit;
216 }
217 ctask->unsol_count -= ctask->data_count;
218 debug_scsi("Need to send %d more as data-out PDUs\n",
219 ctask->unsol_count);
220 }
221
222iscsi_iser_ctask_xmit_unsol_data_exit:
223 return error;
224}
225
226static int
227iscsi_iser_ctask_xmit(struct iscsi_conn *conn,
228 struct iscsi_cmd_task *ctask)
229{
230 struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data;
231 int error = 0;
232
233 debug_scsi("ctask deq [cid %d itt 0x%x]\n",
234 conn->id, ctask->itt);
235
236 /*
237 * serialize with TMF AbortTask
238 */
239 if (ctask->mtask)
240 return error;
241
242 /* Send the cmd PDU */
243 if (!iser_ctask->command_sent) {
244 error = iser_send_command(conn, ctask);
245 if (error)
246 goto iscsi_iser_ctask_xmit_exit;
247 iser_ctask->command_sent = 1;
248 }
249
250 /* Send unsolicited data-out PDU(s) if necessary */
251 if (ctask->unsol_count)
252 error = iscsi_iser_ctask_xmit_unsol_data(conn, ctask);
253
254 iscsi_iser_ctask_xmit_exit:
255 if (error && error != -EAGAIN)
256 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
257 return error;
258}
259
260static void
261iscsi_iser_cleanup_ctask(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
262{
263 struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data;
264
265 if (iser_ctask->status == ISER_TASK_STATUS_STARTED) {
266 iser_ctask->status = ISER_TASK_STATUS_COMPLETED;
267 iser_ctask_rdma_finalize(iser_ctask);
268 }
269}
270
271static struct iser_conn *
272iscsi_iser_ib_conn_lookup(__u64 ep_handle)
273{
274 struct iser_conn *ib_conn;
275 struct iser_conn *uib_conn = (struct iser_conn *)(unsigned long)ep_handle;
276
277 mutex_lock(&ig.connlist_mutex);
278 list_for_each_entry(ib_conn, &ig.connlist, conn_list) {
279 if (ib_conn == uib_conn) {
280 mutex_unlock(&ig.connlist_mutex);
281 return ib_conn;
282 }
283 }
284 mutex_unlock(&ig.connlist_mutex);
285 iser_err("no conn exists for eph %llx\n",(unsigned long long)ep_handle);
286 return NULL;
287}
288
289static struct iscsi_cls_conn *
290iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
291{
292 struct iscsi_conn *conn;
293 struct iscsi_cls_conn *cls_conn;
294 struct iscsi_iser_conn *iser_conn;
295
296 cls_conn = iscsi_conn_setup(cls_session, conn_idx);
297 if (!cls_conn)
298 return NULL;
299 conn = cls_conn->dd_data;
300
301 /*
302 * due to issues with the login code re iser sematics
303 * this not set in iscsi_conn_setup - FIXME
304 */
305 conn->max_recv_dlength = 128;
306
307 iser_conn = kzalloc(sizeof(*iser_conn), GFP_KERNEL);
308 if (!iser_conn)
309 goto conn_alloc_fail;
310
311 /* currently this is the only field which need to be initiated */
312 rwlock_init(&iser_conn->lock);
313
314 conn->dd_data = iser_conn;
315 iser_conn->iscsi_conn = conn;
316
317 return cls_conn;
318
319conn_alloc_fail:
320 iscsi_conn_teardown(cls_conn);
321 return NULL;
322}
323
324static void
325iscsi_iser_conn_destroy(struct iscsi_cls_conn *cls_conn)
326{
327 struct iscsi_conn *conn = cls_conn->dd_data;
328 struct iscsi_iser_conn *iser_conn = conn->dd_data;
329
330 iscsi_conn_teardown(cls_conn);
331 kfree(iser_conn);
332}
333
334static int
335iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session,
336 struct iscsi_cls_conn *cls_conn, uint64_t transport_eph,
337 int is_leading)
338{
339 struct iscsi_conn *conn = cls_conn->dd_data;
340 struct iscsi_iser_conn *iser_conn;
341 struct iser_conn *ib_conn;
342 int error;
343
344 error = iscsi_conn_bind(cls_session, cls_conn, is_leading);
345 if (error)
346 return error;
347
348 /* the transport ep handle comes from user space so it must be
349 * verified against the global ib connections list */
350 ib_conn = iscsi_iser_ib_conn_lookup(transport_eph);
351 if (!ib_conn) {
352 iser_err("can't bind eph %llx\n",
353 (unsigned long long)transport_eph);
354 return -EINVAL;
355 }
356 /* binds the iSER connection retrieved from the previously
357 * connected ep_handle to the iSCSI layer connection. exchanges
358 * connection pointers */
359 iser_err("binding iscsi conn %p to iser_conn %p\n",conn,ib_conn);
360 iser_conn = conn->dd_data;
361 ib_conn->iser_conn = iser_conn;
362 iser_conn->ib_conn = ib_conn;
363
364 conn->recv_lock = &iser_conn->lock;
365
366 return 0;
367}
368
369static int
370iscsi_iser_conn_start(struct iscsi_cls_conn *cls_conn)
371{
372 struct iscsi_conn *conn = cls_conn->dd_data;
373 int err;
374
375 err = iscsi_conn_start(cls_conn);
376 if (err)
377 return err;
378
379 return iser_conn_set_full_featured_mode(conn);
380}
381
382static void
383iscsi_iser_conn_terminate(struct iscsi_conn *conn)
384{
385 struct iscsi_iser_conn *iser_conn = conn->dd_data;
386 struct iser_conn *ib_conn = iser_conn->ib_conn;
387
388 BUG_ON(!ib_conn);
389 /* starts conn teardown process, waits until all previously *
390 * posted buffers get flushed, deallocates all conn resources */
391 iser_conn_terminate(ib_conn);
392 iser_conn->ib_conn = NULL;
393 conn->recv_lock = NULL;
394}
395
396
397static struct iscsi_transport iscsi_iser_transport;
398
399static struct iscsi_cls_session *
400iscsi_iser_session_create(struct iscsi_transport *iscsit,
401 struct scsi_transport_template *scsit,
402 uint32_t initial_cmdsn, uint32_t *hostno)
403{
404 struct iscsi_cls_session *cls_session;
405 struct iscsi_session *session;
406 int i;
407 uint32_t hn;
408 struct iscsi_cmd_task *ctask;
409 struct iscsi_mgmt_task *mtask;
410 struct iscsi_iser_cmd_task *iser_ctask;
411 struct iser_desc *desc;
412
413 cls_session = iscsi_session_setup(iscsit, scsit,
414 sizeof(struct iscsi_iser_cmd_task),
415 sizeof(struct iser_desc),
416 initial_cmdsn, &hn);
417 if (!cls_session)
418 return NULL;
419
420 *hostno = hn;
421 session = class_to_transport_session(cls_session);
422
423 /* libiscsi setup itts, data and pool so just set desc fields */
424 for (i = 0; i < session->cmds_max; i++) {
425 ctask = session->cmds[i];
426 iser_ctask = ctask->dd_data;
427 ctask->hdr = (struct iscsi_cmd *)&iser_ctask->desc.iscsi_header;
428 }
429
430 for (i = 0; i < session->mgmtpool_max; i++) {
431 mtask = session->mgmt_cmds[i];
432 desc = mtask->dd_data;
433 mtask->hdr = &desc->iscsi_header;
434 desc->data = mtask->data;
435 }
436
437 return cls_session;
438}
439
440static int
441iscsi_iser_conn_set_param(struct iscsi_cls_conn *cls_conn,
442 enum iscsi_param param, uint32_t value)
443{
444 struct iscsi_conn *conn = cls_conn->dd_data;
445 struct iscsi_session *session = conn->session;
446
447 spin_lock_bh(&session->lock);
448 if (conn->c_stage != ISCSI_CONN_INITIAL_STAGE &&
449 conn->stop_stage != STOP_CONN_RECOVER) {
450 printk(KERN_ERR "iscsi_iser: can not change parameter [%d]\n",
451 param);
452 spin_unlock_bh(&session->lock);
453 return 0;
454 }
455 spin_unlock_bh(&session->lock);
456
457 switch (param) {
458 case ISCSI_PARAM_MAX_RECV_DLENGTH:
459 /* TBD */
460 break;
461 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
462 conn->max_xmit_dlength = value;
463 break;
464 case ISCSI_PARAM_HDRDGST_EN:
465 if (value) {
466 printk(KERN_ERR "DataDigest wasn't negotiated to None");
467 return -EPROTO;
468 }
469 break;
470 case ISCSI_PARAM_DATADGST_EN:
471 if (value) {
472 printk(KERN_ERR "DataDigest wasn't negotiated to None");
473 return -EPROTO;
474 }
475 break;
476 case ISCSI_PARAM_INITIAL_R2T_EN:
477 session->initial_r2t_en = value;
478 break;
479 case ISCSI_PARAM_IMM_DATA_EN:
480 session->imm_data_en = value;
481 break;
482 case ISCSI_PARAM_FIRST_BURST:
483 session->first_burst = value;
484 break;
485 case ISCSI_PARAM_MAX_BURST:
486 session->max_burst = value;
487 break;
488 case ISCSI_PARAM_PDU_INORDER_EN:
489 session->pdu_inorder_en = value;
490 break;
491 case ISCSI_PARAM_DATASEQ_INORDER_EN:
492 session->dataseq_inorder_en = value;
493 break;
494 case ISCSI_PARAM_ERL:
495 session->erl = value;
496 break;
497 case ISCSI_PARAM_IFMARKER_EN:
498 if (value) {
499 printk(KERN_ERR "IFMarker wasn't negotiated to No");
500 return -EPROTO;
501 }
502 break;
503 case ISCSI_PARAM_OFMARKER_EN:
504 if (value) {
505 printk(KERN_ERR "OFMarker wasn't negotiated to No");
506 return -EPROTO;
507 }
508 break;
509 default:
510 break;
511 }
512
513 return 0;
514}
515
516static int
517iscsi_iser_session_get_param(struct iscsi_cls_session *cls_session,
518 enum iscsi_param param, uint32_t *value)
519{
520 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
521 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
522
523 switch (param) {
524 case ISCSI_PARAM_INITIAL_R2T_EN:
525 *value = session->initial_r2t_en;
526 break;
527 case ISCSI_PARAM_MAX_R2T:
528 *value = session->max_r2t;
529 break;
530 case ISCSI_PARAM_IMM_DATA_EN:
531 *value = session->imm_data_en;
532 break;
533 case ISCSI_PARAM_FIRST_BURST:
534 *value = session->first_burst;
535 break;
536 case ISCSI_PARAM_MAX_BURST:
537 *value = session->max_burst;
538 break;
539 case ISCSI_PARAM_PDU_INORDER_EN:
540 *value = session->pdu_inorder_en;
541 break;
542 case ISCSI_PARAM_DATASEQ_INORDER_EN:
543 *value = session->dataseq_inorder_en;
544 break;
545 case ISCSI_PARAM_ERL:
546 *value = session->erl;
547 break;
548 case ISCSI_PARAM_IFMARKER_EN:
549 *value = 0;
550 break;
551 case ISCSI_PARAM_OFMARKER_EN:
552 *value = 0;
553 break;
554 default:
555 return ISCSI_ERR_PARAM_NOT_FOUND;
556 }
557
558 return 0;
559}
560
561static int
562iscsi_iser_conn_get_param(struct iscsi_cls_conn *cls_conn,
563 enum iscsi_param param, uint32_t *value)
564{
565 struct iscsi_conn *conn = cls_conn->dd_data;
566
567 switch(param) {
568 case ISCSI_PARAM_MAX_RECV_DLENGTH:
569 *value = conn->max_recv_dlength;
570 break;
571 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
572 *value = conn->max_xmit_dlength;
573 break;
574 case ISCSI_PARAM_HDRDGST_EN:
575 *value = 0;
576 break;
577 case ISCSI_PARAM_DATADGST_EN:
578 *value = 0;
579 break;
580 /*case ISCSI_PARAM_TARGET_RECV_DLENGTH:
581 *value = conn->target_recv_dlength;
582 break;
583 case ISCSI_PARAM_INITIATOR_RECV_DLENGTH:
584 *value = conn->initiator_recv_dlength;
585 break;*/
586 default:
587 return ISCSI_ERR_PARAM_NOT_FOUND;
588 }
589
590 return 0;
591}
592
593
594static void
595iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats)
596{
597 struct iscsi_conn *conn = cls_conn->dd_data;
598
599 stats->txdata_octets = conn->txdata_octets;
600 stats->rxdata_octets = conn->rxdata_octets;
601 stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
602 stats->dataout_pdus = conn->dataout_pdus_cnt;
603 stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
604 stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */
605 stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */
606 stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
607 stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
608 stats->custom_length = 3;
609 strcpy(stats->custom[0].desc, "qp_tx_queue_full");
610 stats->custom[0].value = 0; /* TB iser_conn->qp_tx_queue_full; */
611 strcpy(stats->custom[1].desc, "fmr_map_not_avail");
612 stats->custom[1].value = 0; /* TB iser_conn->fmr_map_not_avail */;
613 strcpy(stats->custom[2].desc, "eh_abort_cnt");
614 stats->custom[2].value = conn->eh_abort_cnt;
615}
616
617static int
618iscsi_iser_ep_connect(struct sockaddr *dst_addr, int non_blocking,
619 __u64 *ep_handle)
620{
621 int err;
622 struct iser_conn *ib_conn;
623
624 err = iser_conn_init(&ib_conn);
625 if (err)
626 goto out;
627
628 err = iser_connect(ib_conn, NULL, (struct sockaddr_in *)dst_addr, non_blocking);
629 if (!err)
630 *ep_handle = (__u64)(unsigned long)ib_conn;
631
632out:
633 return err;
634}
635
636static int
637iscsi_iser_ep_poll(__u64 ep_handle, int timeout_ms)
638{
639 struct iser_conn *ib_conn = iscsi_iser_ib_conn_lookup(ep_handle);
640 int rc;
641
642 if (!ib_conn)
643 return -EINVAL;
644
645 rc = wait_event_interruptible_timeout(ib_conn->wait,
646 ib_conn->state == ISER_CONN_UP,
647 msecs_to_jiffies(timeout_ms));
648
649 /* if conn establishment failed, return error code to iscsi */
650 if (!rc &&
651 (ib_conn->state == ISER_CONN_TERMINATING ||
652 ib_conn->state == ISER_CONN_DOWN))
653 rc = -1;
654
655 iser_err("ib conn %p rc = %d\n", ib_conn, rc);
656
657 if (rc > 0)
658 return 1; /* success, this is the equivalent of POLLOUT */
659 else if (!rc)
660 return 0; /* timeout */
661 else
662 return rc; /* signal */
663}
664
665static void
666iscsi_iser_ep_disconnect(__u64 ep_handle)
667{
668 struct iser_conn *ib_conn = iscsi_iser_ib_conn_lookup(ep_handle);
669
670 if (!ib_conn)
671 return;
672
673 iser_err("ib conn %p state %d\n",ib_conn, ib_conn->state);
674
675 iser_conn_terminate(ib_conn);
676}
677
678static struct scsi_host_template iscsi_iser_sht = {
679 .name = "iSCSI Initiator over iSER, v." DRV_VER,
680 .queuecommand = iscsi_queuecommand,
681 .can_queue = ISCSI_XMIT_CMDS_MAX - 1,
682 .sg_tablesize = ISCSI_ISER_SG_TABLESIZE,
683 .cmd_per_lun = ISCSI_MAX_CMD_PER_LUN,
684 .eh_abort_handler = iscsi_eh_abort,
685 .eh_host_reset_handler = iscsi_eh_host_reset,
686 .use_clustering = DISABLE_CLUSTERING,
687 .proc_name = "iscsi_iser",
688 .this_id = -1,
689};
690
691static struct iscsi_transport iscsi_iser_transport = {
692 .owner = THIS_MODULE,
693 .name = "iser",
694 .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T,
695 .param_mask = ISCSI_MAX_RECV_DLENGTH |
696 ISCSI_MAX_XMIT_DLENGTH |
697 ISCSI_HDRDGST_EN |
698 ISCSI_DATADGST_EN |
699 ISCSI_INITIAL_R2T_EN |
700 ISCSI_MAX_R2T |
701 ISCSI_IMM_DATA_EN |
702 ISCSI_FIRST_BURST |
703 ISCSI_MAX_BURST |
704 ISCSI_PDU_INORDER_EN |
705 ISCSI_DATASEQ_INORDER_EN,
706 .host_template = &iscsi_iser_sht,
707 .conndata_size = sizeof(struct iscsi_conn),
708 .max_lun = ISCSI_ISER_MAX_LUN,
709 .max_cmd_len = ISCSI_ISER_MAX_CMD_LEN,
710 /* session management */
711 .create_session = iscsi_iser_session_create,
712 .destroy_session = iscsi_session_teardown,
713 /* connection management */
714 .create_conn = iscsi_iser_conn_create,
715 .bind_conn = iscsi_iser_conn_bind,
716 .destroy_conn = iscsi_iser_conn_destroy,
717 .set_param = iscsi_iser_conn_set_param,
718 .get_conn_param = iscsi_iser_conn_get_param,
719 .get_session_param = iscsi_iser_session_get_param,
720 .start_conn = iscsi_iser_conn_start,
721 .stop_conn = iscsi_conn_stop,
722 /* these are called as part of conn recovery */
723 .suspend_conn_recv = NULL, /* FIXME is/how this relvant to iser? */
724 .terminate_conn = iscsi_iser_conn_terminate,
725 /* IO */
726 .send_pdu = iscsi_conn_send_pdu,
727 .get_stats = iscsi_iser_conn_get_stats,
728 .init_cmd_task = iscsi_iser_cmd_init,
729 .xmit_cmd_task = iscsi_iser_ctask_xmit,
730 .xmit_mgmt_task = iscsi_iser_mtask_xmit,
731 .cleanup_cmd_task = iscsi_iser_cleanup_ctask,
732 /* recovery */
733 .session_recovery_timedout = iscsi_session_recovery_timedout,
734
735 .ep_connect = iscsi_iser_ep_connect,
736 .ep_poll = iscsi_iser_ep_poll,
737 .ep_disconnect = iscsi_iser_ep_disconnect
738};
739
740static int __init iser_init(void)
741{
742 int err;
743
744 iser_dbg("Starting iSER datamover...\n");
745
746 if (iscsi_max_lun < 1) {
747 printk(KERN_ERR "Invalid max_lun value of %u\n", iscsi_max_lun);
748 return -EINVAL;
749 }
750
751 iscsi_iser_transport.max_lun = iscsi_max_lun;
752
753 memset(&ig, 0, sizeof(struct iser_global));
754
755 ig.desc_cache = kmem_cache_create("iser_descriptors",
756 sizeof (struct iser_desc),
757 0, SLAB_HWCACHE_ALIGN,
758 NULL, NULL);
759 if (ig.desc_cache == NULL)
760 return -ENOMEM;
761
762 /* device init is called only after the first addr resolution */
763 mutex_init(&ig.device_list_mutex);
764 INIT_LIST_HEAD(&ig.device_list);
765 mutex_init(&ig.connlist_mutex);
766 INIT_LIST_HEAD(&ig.connlist);
767
768 if (!iscsi_register_transport(&iscsi_iser_transport)) {
769 iser_err("iscsi_register_transport failed\n");
770 err = -EINVAL;
771 goto register_transport_failure;
772 }
773
774 return 0;
775
776register_transport_failure:
777 kmem_cache_destroy(ig.desc_cache);
778
779 return err;
780}
781
782static void __exit iser_exit(void)
783{
784 iser_dbg("Removing iSER datamover...\n");
785 iscsi_unregister_transport(&iscsi_iser_transport);
786 kmem_cache_destroy(ig.desc_cache);
787}
788
789module_init(iser_init);
790module_exit(iser_exit);
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-23 06:10:11 -0500