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
iscsi_iser_recv(struct iscsi_conn * conn,struct iscsi_hdr * hdr,char * rx_data,int rx_data_len)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
iscsi_iser_pdu_alloc(struct iscsi_task * task,uint8_t opcode)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
iser_initialize_task_headers(struct iscsi_task * task,struct iser_tx_desc * tx_desc)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
iscsi_iser_task_init(struct iscsi_task * task)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
iscsi_iser_mtask_xmit(struct iscsi_conn * conn,struct iscsi_task * task)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
iscsi_iser_task_xmit_unsol_data(struct iscsi_conn * conn,struct iscsi_task * task)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
iscsi_iser_task_xmit(struct iscsi_task * task)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
iscsi_iser_cleanup_task(struct iscsi_task * task)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 *
iscsi_iser_conn_create(struct iscsi_cls_session * cls_session,uint32_t conn_idx)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
iscsi_iser_conn_destroy(struct iscsi_cls_conn * cls_conn)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
iscsi_iser_conn_bind(struct iscsi_cls_session * cls_session,struct iscsi_cls_conn * cls_conn,uint64_t transport_eph,int is_leading)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
iscsi_iser_conn_stop(struct iscsi_cls_conn * cls_conn,int flag)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
iscsi_iser_conn_start(struct iscsi_cls_conn * cls_conn)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
iscsi_iser_session_destroy(struct iscsi_cls_session * cls_session)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 *
iscsi_iser_session_create(struct iscsi_endpoint * ep,uint16_t cmds_max,uint16_t qdepth,uint32_t initial_cmdsn)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
iscsi_iser_set_param(struct iscsi_cls_conn * cls_conn,enum iscsi_param param,char * buf,int buflen)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
iscsi_iser_conn_get_stats(struct iscsi_cls_conn * cls_conn,struct iscsi_stats * stats)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
iscsi_iser_get_ep_param(struct iscsi_endpoint * ep,enum iscsi_param param,char * buf)535 static int iscsi_iser_get_ep_param(struct iscsi_endpoint *ep,
536 enum iscsi_param param, char *buf)
537 {
538 struct iser_conn *ib_conn = ep->dd_data;
539 int len;
540
541 switch (param) {
542 case ISCSI_PARAM_CONN_PORT:
543 case ISCSI_PARAM_CONN_ADDRESS:
544 if (!ib_conn || !ib_conn->cma_id)
545 return -ENOTCONN;
546
547 return iscsi_conn_get_addr_param((struct sockaddr_storage *)
548 &ib_conn->cma_id->route.addr.dst_addr,
549 param, buf);
550 break;
551 default:
552 return -ENOSYS;
553 }
554
555 return len;
556 }
557
558 static struct iscsi_endpoint *
iscsi_iser_ep_connect(struct Scsi_Host * shost,struct sockaddr * dst_addr,int non_blocking)559 iscsi_iser_ep_connect(struct Scsi_Host *shost, struct sockaddr *dst_addr,
560 int non_blocking)
561 {
562 int err;
563 struct iser_conn *ib_conn;
564 struct iscsi_endpoint *ep;
565
566 ep = iscsi_create_endpoint(sizeof(*ib_conn));
567 if (!ep)
568 return ERR_PTR(-ENOMEM);
569
570 ib_conn = ep->dd_data;
571 ib_conn->ep = ep;
572 iser_conn_init(ib_conn);
573
574 err = iser_connect(ib_conn, NULL, (struct sockaddr_in *)dst_addr,
575 non_blocking);
576 if (err) {
577 iscsi_destroy_endpoint(ep);
578 return ERR_PTR(err);
579 }
580 return ep;
581 }
582
583 static int
iscsi_iser_ep_poll(struct iscsi_endpoint * ep,int timeout_ms)584 iscsi_iser_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
585 {
586 struct iser_conn *ib_conn;
587 int rc;
588
589 ib_conn = ep->dd_data;
590 rc = wait_event_interruptible_timeout(ib_conn->wait,
591 ib_conn->state == ISER_CONN_UP,
592 msecs_to_jiffies(timeout_ms));
593
594 /* if conn establishment failed, return error code to iscsi */
595 if (!rc &&
596 (ib_conn->state == ISER_CONN_TERMINATING ||
597 ib_conn->state == ISER_CONN_DOWN))
598 rc = -1;
599
600 iser_err("ib conn %p rc = %d\n", ib_conn, rc);
601
602 if (rc > 0)
603 return 1; /* success, this is the equivalent of POLLOUT */
604 else if (!rc)
605 return 0; /* timeout */
606 else
607 return rc; /* signal */
608 }
609
610 static void
iscsi_iser_ep_disconnect(struct iscsi_endpoint * ep)611 iscsi_iser_ep_disconnect(struct iscsi_endpoint *ep)
612 {
613 struct iser_conn *ib_conn;
614
615 ib_conn = ep->dd_data;
616 if (ib_conn->iser_conn)
617 /*
618 * Must suspend xmit path if the ep is bound to the
619 * iscsi_conn, so we know we are not accessing the ib_conn
620 * when we free it.
621 *
622 * This may not be bound if the ep poll failed.
623 */
624 iscsi_suspend_tx(ib_conn->iser_conn->iscsi_conn);
625
626
627 iser_err("ib conn %p state %d\n",ib_conn, ib_conn->state);
628 iser_conn_terminate(ib_conn);
629 }
630
631 static struct scsi_host_template iscsi_iser_sht = {
632 .module = THIS_MODULE,
633 .name = "iSCSI Initiator over iSER, v." DRV_VER,
634 .queuecommand = iscsi_queuecommand,
635 .change_queue_depth = iscsi_change_queue_depth,
636 .sg_tablesize = ISCSI_ISER_SG_TABLESIZE,
637 .max_sectors = 1024,
638 .cmd_per_lun = ISER_DEF_CMD_PER_LUN,
639 .eh_abort_handler = iscsi_eh_abort,
640 .eh_device_reset_handler= iscsi_eh_device_reset,
641 .eh_target_reset_handler = iscsi_eh_recover_target,
642 .target_alloc = iscsi_target_alloc,
643 .use_clustering = DISABLE_CLUSTERING,
644 .proc_name = "iscsi_iser",
645 .this_id = -1,
646 };
647
648 static struct iscsi_transport iscsi_iser_transport = {
649 .owner = THIS_MODULE,
650 .name = "iser",
651 .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T,
652 .param_mask = ISCSI_MAX_RECV_DLENGTH |
653 ISCSI_MAX_XMIT_DLENGTH |
654 ISCSI_HDRDGST_EN |
655 ISCSI_DATADGST_EN |
656 ISCSI_INITIAL_R2T_EN |
657 ISCSI_MAX_R2T |
658 ISCSI_IMM_DATA_EN |
659 ISCSI_FIRST_BURST |
660 ISCSI_MAX_BURST |
661 ISCSI_PDU_INORDER_EN |
662 ISCSI_DATASEQ_INORDER_EN |
663 ISCSI_CONN_PORT |
664 ISCSI_CONN_ADDRESS |
665 ISCSI_EXP_STATSN |
666 ISCSI_PERSISTENT_PORT |
667 ISCSI_PERSISTENT_ADDRESS |
668 ISCSI_TARGET_NAME | ISCSI_TPGT |
669 ISCSI_USERNAME | ISCSI_PASSWORD |
670 ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN |
671 ISCSI_FAST_ABORT | ISCSI_ABORT_TMO |
672 ISCSI_LU_RESET_TMO | ISCSI_TGT_RESET_TMO |
673 ISCSI_PING_TMO | ISCSI_RECV_TMO |
674 ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME,
675 .host_param_mask = ISCSI_HOST_HWADDRESS |
676 ISCSI_HOST_NETDEV_NAME |
677 ISCSI_HOST_INITIATOR_NAME,
678 /* session management */
679 .create_session = iscsi_iser_session_create,
680 .destroy_session = iscsi_iser_session_destroy,
681 /* connection management */
682 .create_conn = iscsi_iser_conn_create,
683 .bind_conn = iscsi_iser_conn_bind,
684 .destroy_conn = iscsi_iser_conn_destroy,
685 .set_param = iscsi_iser_set_param,
686 .get_conn_param = iscsi_conn_get_param,
687 .get_ep_param = iscsi_iser_get_ep_param,
688 .get_session_param = iscsi_session_get_param,
689 .start_conn = iscsi_iser_conn_start,
690 .stop_conn = iscsi_iser_conn_stop,
691 /* iscsi host params */
692 .get_host_param = iscsi_host_get_param,
693 .set_host_param = iscsi_host_set_param,
694 /* IO */
695 .send_pdu = iscsi_conn_send_pdu,
696 .get_stats = iscsi_iser_conn_get_stats,
697 .init_task = iscsi_iser_task_init,
698 .xmit_task = iscsi_iser_task_xmit,
699 .cleanup_task = iscsi_iser_cleanup_task,
700 .alloc_pdu = iscsi_iser_pdu_alloc,
701 /* recovery */
702 .session_recovery_timedout = iscsi_session_recovery_timedout,
703
704 .ep_connect = iscsi_iser_ep_connect,
705 .ep_poll = iscsi_iser_ep_poll,
706 .ep_disconnect = iscsi_iser_ep_disconnect
707 };
708
iser_init(void)709 static int __init iser_init(void)
710 {
711 int err;
712
713 iser_dbg("Starting iSER datamover...\n");
714
715 if (iscsi_max_lun < 1) {
716 printk(KERN_ERR "Invalid max_lun value of %u\n", iscsi_max_lun);
717 return -EINVAL;
718 }
719
720 memset(&ig, 0, sizeof(struct iser_global));
721
722 ig.desc_cache = kmem_cache_create("iser_descriptors",
723 sizeof(struct iser_tx_desc),
724 0, SLAB_HWCACHE_ALIGN,
725 NULL);
726 if (ig.desc_cache == NULL)
727 return -ENOMEM;
728
729 /* device init is called only after the first addr resolution */
730 mutex_init(&ig.device_list_mutex);
731 INIT_LIST_HEAD(&ig.device_list);
732 mutex_init(&ig.connlist_mutex);
733 INIT_LIST_HEAD(&ig.connlist);
734
735 iscsi_iser_scsi_transport = iscsi_register_transport(
736 &iscsi_iser_transport);
737 if (!iscsi_iser_scsi_transport) {
738 iser_err("iscsi_register_transport failed\n");
739 err = -EINVAL;
740 goto register_transport_failure;
741 }
742
743 return 0;
744
745 register_transport_failure:
746 kmem_cache_destroy(ig.desc_cache);
747
748 return err;
749 }
750
iser_exit(void)751 static void __exit iser_exit(void)
752 {
753 iser_dbg("Removing iSER datamover...\n");
754 iscsi_unregister_transport(&iscsi_iser_transport);
755 kmem_cache_destroy(ig.desc_cache);
756 }
757
758 module_init(iser_init);
759 module_exit(iser_exit);
760