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Merge git://git.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-2.6
[mirror_ubuntu-zesty-kernel.git] / drivers / scsi / libiscsi.c
1 /*
2 * iSCSI lib functions
3 *
4 * Copyright (C) 2006 Red Hat, Inc. All rights reserved.
5 * Copyright (C) 2004 - 2006 Mike Christie
6 * Copyright (C) 2004 - 2005 Dmitry Yusupov
7 * Copyright (C) 2004 - 2005 Alex Aizman
8 * maintained by open-iscsi@googlegroups.com
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23 */
24 #include <linux/types.h>
25 #include <linux/kfifo.h>
26 #include <linux/delay.h>
27 #include <linux/log2.h>
28 #include <asm/unaligned.h>
29 #include <net/tcp.h>
30 #include <scsi/scsi_cmnd.h>
31 #include <scsi/scsi_device.h>
32 #include <scsi/scsi_eh.h>
33 #include <scsi/scsi_tcq.h>
34 #include <scsi/scsi_host.h>
35 #include <scsi/scsi.h>
36 #include <scsi/iscsi_proto.h>
37 #include <scsi/scsi_transport.h>
38 #include <scsi/scsi_transport_iscsi.h>
39 #include <scsi/libiscsi.h>
40
41 struct iscsi_session *
42 class_to_transport_session(struct iscsi_cls_session *cls_session)
43 {
44 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
45 return iscsi_hostdata(shost->hostdata);
46 }
47 EXPORT_SYMBOL_GPL(class_to_transport_session);
48
49 /* Serial Number Arithmetic, 32 bits, less than, RFC1982 */
50 #define SNA32_CHECK 2147483648UL
51
52 static int iscsi_sna_lt(u32 n1, u32 n2)
53 {
54 return n1 != n2 && ((n1 < n2 && (n2 - n1 < SNA32_CHECK)) ||
55 (n1 > n2 && (n2 - n1 < SNA32_CHECK)));
56 }
57
58 /* Serial Number Arithmetic, 32 bits, less than, RFC1982 */
59 static int iscsi_sna_lte(u32 n1, u32 n2)
60 {
61 return n1 == n2 || ((n1 < n2 && (n2 - n1 < SNA32_CHECK)) ||
62 (n1 > n2 && (n2 - n1 < SNA32_CHECK)));
63 }
64
65 void
66 iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr)
67 {
68 uint32_t max_cmdsn = be32_to_cpu(hdr->max_cmdsn);
69 uint32_t exp_cmdsn = be32_to_cpu(hdr->exp_cmdsn);
70
71 /*
72 * standard specifies this check for when to update expected and
73 * max sequence numbers
74 */
75 if (iscsi_sna_lt(max_cmdsn, exp_cmdsn - 1))
76 return;
77
78 if (exp_cmdsn != session->exp_cmdsn &&
79 !iscsi_sna_lt(exp_cmdsn, session->exp_cmdsn))
80 session->exp_cmdsn = exp_cmdsn;
81
82 if (max_cmdsn != session->max_cmdsn &&
83 !iscsi_sna_lt(max_cmdsn, session->max_cmdsn)) {
84 session->max_cmdsn = max_cmdsn;
85 /*
86 * if the window closed with IO queued, then kick the
87 * xmit thread
88 */
89 if (!list_empty(&session->leadconn->xmitqueue) ||
90 !list_empty(&session->leadconn->mgmtqueue))
91 scsi_queue_work(session->host,
92 &session->leadconn->xmitwork);
93 }
94 }
95 EXPORT_SYMBOL_GPL(iscsi_update_cmdsn);
96
97 void iscsi_prep_unsolicit_data_pdu(struct iscsi_cmd_task *ctask,
98 struct iscsi_data *hdr)
99 {
100 struct iscsi_conn *conn = ctask->conn;
101
102 memset(hdr, 0, sizeof(struct iscsi_data));
103 hdr->ttt = cpu_to_be32(ISCSI_RESERVED_TAG);
104 hdr->datasn = cpu_to_be32(ctask->unsol_datasn);
105 ctask->unsol_datasn++;
106 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
107 memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
108
109 hdr->itt = ctask->hdr->itt;
110 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
111 hdr->offset = cpu_to_be32(ctask->unsol_offset);
112
113 if (ctask->unsol_count > conn->max_xmit_dlength) {
114 hton24(hdr->dlength, conn->max_xmit_dlength);
115 ctask->data_count = conn->max_xmit_dlength;
116 ctask->unsol_offset += ctask->data_count;
117 hdr->flags = 0;
118 } else {
119 hton24(hdr->dlength, ctask->unsol_count);
120 ctask->data_count = ctask->unsol_count;
121 hdr->flags = ISCSI_FLAG_CMD_FINAL;
122 }
123 }
124 EXPORT_SYMBOL_GPL(iscsi_prep_unsolicit_data_pdu);
125
126 static int iscsi_add_hdr(struct iscsi_cmd_task *ctask, unsigned len)
127 {
128 unsigned exp_len = ctask->hdr_len + len;
129
130 if (exp_len > ctask->hdr_max) {
131 WARN_ON(1);
132 return -EINVAL;
133 }
134
135 WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */
136 ctask->hdr_len = exp_len;
137 return 0;
138 }
139
140 /**
141 * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
142 * @ctask: iscsi cmd task
143 *
144 * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set
145 * fields like dlength or final based on how much data it sends
146 */
147 static int iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask)
148 {
149 struct iscsi_conn *conn = ctask->conn;
150 struct iscsi_session *session = conn->session;
151 struct iscsi_cmd *hdr = ctask->hdr;
152 struct scsi_cmnd *sc = ctask->sc;
153 unsigned hdrlength;
154 int rc;
155
156 ctask->hdr_len = 0;
157 rc = iscsi_add_hdr(ctask, sizeof(*hdr));
158 if (rc)
159 return rc;
160 hdr->opcode = ISCSI_OP_SCSI_CMD;
161 hdr->flags = ISCSI_ATTR_SIMPLE;
162 int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun);
163 hdr->itt = build_itt(ctask->itt, conn->id, session->age);
164 hdr->data_length = cpu_to_be32(scsi_bufflen(sc));
165 hdr->cmdsn = cpu_to_be32(session->cmdsn);
166 session->cmdsn++;
167 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
168 memcpy(hdr->cdb, sc->cmnd, sc->cmd_len);
169 if (sc->cmd_len < MAX_COMMAND_SIZE)
170 memset(&hdr->cdb[sc->cmd_len], 0,
171 MAX_COMMAND_SIZE - sc->cmd_len);
172
173 ctask->imm_count = 0;
174 if (sc->sc_data_direction == DMA_TO_DEVICE) {
175 hdr->flags |= ISCSI_FLAG_CMD_WRITE;
176 /*
177 * Write counters:
178 *
179 * imm_count bytes to be sent right after
180 * SCSI PDU Header
181 *
182 * unsol_count bytes(as Data-Out) to be sent
183 * without R2T ack right after
184 * immediate data
185 *
186 * r2t_data_count bytes to be sent via R2T ack's
187 *
188 * pad_count bytes to be sent as zero-padding
189 */
190 ctask->unsol_count = 0;
191 ctask->unsol_offset = 0;
192 ctask->unsol_datasn = 0;
193
194 if (session->imm_data_en) {
195 if (scsi_bufflen(sc) >= session->first_burst)
196 ctask->imm_count = min(session->first_burst,
197 conn->max_xmit_dlength);
198 else
199 ctask->imm_count = min(scsi_bufflen(sc),
200 conn->max_xmit_dlength);
201 hton24(hdr->dlength, ctask->imm_count);
202 } else
203 zero_data(hdr->dlength);
204
205 if (!session->initial_r2t_en) {
206 ctask->unsol_count = min((session->first_burst),
207 (scsi_bufflen(sc))) - ctask->imm_count;
208 ctask->unsol_offset = ctask->imm_count;
209 }
210
211 if (!ctask->unsol_count)
212 /* No unsolicit Data-Out's */
213 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
214 } else {
215 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
216 zero_data(hdr->dlength);
217
218 if (sc->sc_data_direction == DMA_FROM_DEVICE)
219 hdr->flags |= ISCSI_FLAG_CMD_READ;
220 }
221
222 /* calculate size of additional header segments (AHSs) */
223 hdrlength = ctask->hdr_len - sizeof(*hdr);
224
225 WARN_ON(hdrlength & (ISCSI_PAD_LEN-1));
226 hdrlength /= ISCSI_PAD_LEN;
227
228 WARN_ON(hdrlength >= 256);
229 hdr->hlength = hdrlength & 0xFF;
230
231 if (conn->session->tt->init_cmd_task(conn->ctask))
232 return EIO;
233
234 conn->scsicmd_pdus_cnt++;
235 debug_scsi("iscsi prep [%s cid %d sc %p cdb 0x%x itt 0x%x len %d "
236 "cmdsn %d win %d]\n",
237 sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read",
238 conn->id, sc, sc->cmnd[0], ctask->itt, scsi_bufflen(sc),
239 session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1);
240 return 0;
241 }
242
243 /**
244 * iscsi_complete_command - return command back to scsi-ml
245 * @ctask: iscsi cmd task
246 *
247 * Must be called with session lock.
248 * This function returns the scsi command to scsi-ml and returns
249 * the cmd task to the pool of available cmd tasks.
250 */
251 static void iscsi_complete_command(struct iscsi_cmd_task *ctask)
252 {
253 struct iscsi_conn *conn = ctask->conn;
254 struct iscsi_session *session = conn->session;
255 struct scsi_cmnd *sc = ctask->sc;
256
257 ctask->state = ISCSI_TASK_COMPLETED;
258 ctask->sc = NULL;
259 /* SCSI eh reuses commands to verify us */
260 sc->SCp.ptr = NULL;
261 if (conn->ctask == ctask)
262 conn->ctask = NULL;
263 list_del_init(&ctask->running);
264 __kfifo_put(session->cmdpool.queue, (void*)&ctask, sizeof(void*));
265 sc->scsi_done(sc);
266 }
267
268 static void __iscsi_get_ctask(struct iscsi_cmd_task *ctask)
269 {
270 atomic_inc(&ctask->refcount);
271 }
272
273 static void __iscsi_put_ctask(struct iscsi_cmd_task *ctask)
274 {
275 if (atomic_dec_and_test(&ctask->refcount))
276 iscsi_complete_command(ctask);
277 }
278
279 /*
280 * session lock must be held
281 */
282 static void fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
283 int err)
284 {
285 struct scsi_cmnd *sc;
286
287 sc = ctask->sc;
288 if (!sc)
289 return;
290
291 if (ctask->state == ISCSI_TASK_PENDING)
292 /*
293 * cmd never made it to the xmit thread, so we should not count
294 * the cmd in the sequencing
295 */
296 conn->session->queued_cmdsn--;
297 else
298 conn->session->tt->cleanup_cmd_task(conn, ctask);
299
300 sc->result = err;
301 scsi_set_resid(sc, scsi_bufflen(sc));
302 if (conn->ctask == ctask)
303 conn->ctask = NULL;
304 /* release ref from queuecommand */
305 __iscsi_put_ctask(ctask);
306 }
307
308 /**
309 * iscsi_free_mgmt_task - return mgmt task back to pool
310 * @conn: iscsi connection
311 * @mtask: mtask
312 *
313 * Must be called with session lock.
314 */
315 void iscsi_free_mgmt_task(struct iscsi_conn *conn,
316 struct iscsi_mgmt_task *mtask)
317 {
318 list_del_init(&mtask->running);
319 if (conn->login_mtask == mtask)
320 return;
321
322 if (conn->ping_mtask == mtask)
323 conn->ping_mtask = NULL;
324 __kfifo_put(conn->session->mgmtpool.queue,
325 (void*)&mtask, sizeof(void*));
326 }
327 EXPORT_SYMBOL_GPL(iscsi_free_mgmt_task);
328
329 static struct iscsi_mgmt_task *
330 __iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
331 char *data, uint32_t data_size)
332 {
333 struct iscsi_session *session = conn->session;
334 struct iscsi_mgmt_task *mtask;
335
336 if (session->state == ISCSI_STATE_TERMINATE)
337 return NULL;
338
339 if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) ||
340 hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
341 /*
342 * Login and Text are sent serially, in
343 * request-followed-by-response sequence.
344 * Same mtask can be used. Same ITT must be used.
345 * Note that login_mtask is preallocated at conn_create().
346 */
347 mtask = conn->login_mtask;
348 else {
349 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
350 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
351
352 if (!__kfifo_get(session->mgmtpool.queue,
353 (void*)&mtask, sizeof(void*)))
354 return NULL;
355 }
356
357 if (data_size) {
358 memcpy(mtask->data, data, data_size);
359 mtask->data_count = data_size;
360 } else
361 mtask->data_count = 0;
362
363 memcpy(mtask->hdr, hdr, sizeof(struct iscsi_hdr));
364 INIT_LIST_HEAD(&mtask->running);
365 list_add_tail(&mtask->running, &conn->mgmtqueue);
366 return mtask;
367 }
368
369 int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr,
370 char *data, uint32_t data_size)
371 {
372 struct iscsi_conn *conn = cls_conn->dd_data;
373 struct iscsi_session *session = conn->session;
374 int err = 0;
375
376 spin_lock_bh(&session->lock);
377 if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size))
378 err = -EPERM;
379 spin_unlock_bh(&session->lock);
380 scsi_queue_work(session->host, &conn->xmitwork);
381 return err;
382 }
383 EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu);
384
385 /**
386 * iscsi_cmd_rsp - SCSI Command Response processing
387 * @conn: iscsi connection
388 * @hdr: iscsi header
389 * @ctask: scsi command task
390 * @data: cmd data buffer
391 * @datalen: len of buffer
392 *
393 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and
394 * then completes the command and task.
395 **/
396 static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
397 struct iscsi_cmd_task *ctask, char *data,
398 int datalen)
399 {
400 struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)hdr;
401 struct iscsi_session *session = conn->session;
402 struct scsi_cmnd *sc = ctask->sc;
403
404 iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr);
405 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
406
407 sc->result = (DID_OK << 16) | rhdr->cmd_status;
408
409 if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) {
410 sc->result = DID_ERROR << 16;
411 goto out;
412 }
413
414 if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) {
415 uint16_t senselen;
416
417 if (datalen < 2) {
418 invalid_datalen:
419 printk(KERN_ERR "iscsi: Got CHECK_CONDITION but "
420 "invalid data buffer size of %d\n", datalen);
421 sc->result = DID_BAD_TARGET << 16;
422 goto out;
423 }
424
425 senselen = be16_to_cpu(get_unaligned((__be16 *) data));
426 if (datalen < senselen)
427 goto invalid_datalen;
428
429 memcpy(sc->sense_buffer, data + 2,
430 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
431 debug_scsi("copied %d bytes of sense\n",
432 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
433 }
434
435 if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW |
436 ISCSI_FLAG_CMD_OVERFLOW)) {
437 int res_count = be32_to_cpu(rhdr->residual_count);
438
439 if (res_count > 0 &&
440 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
441 res_count <= scsi_bufflen(sc)))
442 scsi_set_resid(sc, res_count);
443 else
444 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
445 } else if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW |
446 ISCSI_FLAG_CMD_BIDI_OVERFLOW))
447 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
448
449 out:
450 debug_scsi("done [sc %lx res %d itt 0x%x]\n",
451 (long)sc, sc->result, ctask->itt);
452 conn->scsirsp_pdus_cnt++;
453
454 __iscsi_put_ctask(ctask);
455 }
456
457 static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
458 {
459 struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr;
460
461 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
462 conn->tmfrsp_pdus_cnt++;
463
464 if (conn->tmf_state != TMF_QUEUED)
465 return;
466
467 if (tmf->response == ISCSI_TMF_RSP_COMPLETE)
468 conn->tmf_state = TMF_SUCCESS;
469 else if (tmf->response == ISCSI_TMF_RSP_NO_TASK)
470 conn->tmf_state = TMF_NOT_FOUND;
471 else
472 conn->tmf_state = TMF_FAILED;
473 wake_up(&conn->ehwait);
474 }
475
476 static void iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr)
477 {
478 struct iscsi_nopout hdr;
479 struct iscsi_mgmt_task *mtask;
480
481 if (!rhdr && conn->ping_mtask)
482 return;
483
484 memset(&hdr, 0, sizeof(struct iscsi_nopout));
485 hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE;
486 hdr.flags = ISCSI_FLAG_CMD_FINAL;
487
488 if (rhdr) {
489 memcpy(hdr.lun, rhdr->lun, 8);
490 hdr.ttt = rhdr->ttt;
491 hdr.itt = RESERVED_ITT;
492 } else
493 hdr.ttt = RESERVED_ITT;
494
495 mtask = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0);
496 if (!mtask) {
497 printk(KERN_ERR "Could not send nopout\n");
498 return;
499 }
500
501 /* only track our nops */
502 if (!rhdr) {
503 conn->ping_mtask = mtask;
504 conn->last_ping = jiffies;
505 }
506 scsi_queue_work(conn->session->host, &conn->xmitwork);
507 }
508
509 static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
510 char *data, int datalen)
511 {
512 struct iscsi_reject *reject = (struct iscsi_reject *)hdr;
513 struct iscsi_hdr rejected_pdu;
514 uint32_t itt;
515
516 conn->exp_statsn = be32_to_cpu(reject->statsn) + 1;
517
518 if (reject->reason == ISCSI_REASON_DATA_DIGEST_ERROR) {
519 if (ntoh24(reject->dlength) > datalen)
520 return ISCSI_ERR_PROTO;
521
522 if (ntoh24(reject->dlength) >= sizeof(struct iscsi_hdr)) {
523 memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr));
524 itt = get_itt(rejected_pdu.itt);
525 printk(KERN_ERR "itt 0x%x had pdu (op 0x%x) rejected "
526 "due to DataDigest error.\n", itt,
527 rejected_pdu.opcode);
528 }
529 }
530 return 0;
531 }
532
533 /**
534 * __iscsi_complete_pdu - complete pdu
535 * @conn: iscsi conn
536 * @hdr: iscsi header
537 * @data: data buffer
538 * @datalen: len of data buffer
539 *
540 * Completes pdu processing by freeing any resources allocated at
541 * queuecommand or send generic. session lock must be held and verify
542 * itt must have been called.
543 */
544 int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
545 char *data, int datalen)
546 {
547 struct iscsi_session *session = conn->session;
548 int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0;
549 struct iscsi_cmd_task *ctask;
550 struct iscsi_mgmt_task *mtask;
551 uint32_t itt;
552
553 conn->last_recv = jiffies;
554 if (hdr->itt != RESERVED_ITT)
555 itt = get_itt(hdr->itt);
556 else
557 itt = ~0U;
558
559 if (itt < session->cmds_max) {
560 ctask = session->cmds[itt];
561
562 debug_scsi("cmdrsp [op 0x%x cid %d itt 0x%x len %d]\n",
563 opcode, conn->id, ctask->itt, datalen);
564
565 switch(opcode) {
566 case ISCSI_OP_SCSI_CMD_RSP:
567 BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
568 iscsi_scsi_cmd_rsp(conn, hdr, ctask, data,
569 datalen);
570 break;
571 case ISCSI_OP_SCSI_DATA_IN:
572 BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
573 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
574 conn->scsirsp_pdus_cnt++;
575 __iscsi_put_ctask(ctask);
576 }
577 break;
578 case ISCSI_OP_R2T:
579 /* LLD handles this for now */
580 break;
581 default:
582 rc = ISCSI_ERR_BAD_OPCODE;
583 break;
584 }
585 } else if (itt >= ISCSI_MGMT_ITT_OFFSET &&
586 itt < ISCSI_MGMT_ITT_OFFSET + session->mgmtpool_max) {
587 mtask = session->mgmt_cmds[itt - ISCSI_MGMT_ITT_OFFSET];
588
589 debug_scsi("immrsp [op 0x%x cid %d itt 0x%x len %d]\n",
590 opcode, conn->id, mtask->itt, datalen);
591
592 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
593 switch(opcode) {
594 case ISCSI_OP_LOGOUT_RSP:
595 if (datalen) {
596 rc = ISCSI_ERR_PROTO;
597 break;
598 }
599 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
600 /* fall through */
601 case ISCSI_OP_LOGIN_RSP:
602 case ISCSI_OP_TEXT_RSP:
603 /*
604 * login related PDU's exp_statsn is handled in
605 * userspace
606 */
607 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
608 rc = ISCSI_ERR_CONN_FAILED;
609 iscsi_free_mgmt_task(conn, mtask);
610 break;
611 case ISCSI_OP_SCSI_TMFUNC_RSP:
612 if (datalen) {
613 rc = ISCSI_ERR_PROTO;
614 break;
615 }
616
617 iscsi_tmf_rsp(conn, hdr);
618 iscsi_free_mgmt_task(conn, mtask);
619 break;
620 case ISCSI_OP_NOOP_IN:
621 if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) ||
622 datalen) {
623 rc = ISCSI_ERR_PROTO;
624 break;
625 }
626 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
627
628 if (conn->ping_mtask != mtask) {
629 /*
630 * If this is not in response to one of our
631 * nops then it must be from userspace.
632 */
633 if (iscsi_recv_pdu(conn->cls_conn, hdr, data,
634 datalen))
635 rc = ISCSI_ERR_CONN_FAILED;
636 }
637 iscsi_free_mgmt_task(conn, mtask);
638 break;
639 default:
640 rc = ISCSI_ERR_BAD_OPCODE;
641 break;
642 }
643 } else if (itt == ~0U) {
644 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
645
646 switch(opcode) {
647 case ISCSI_OP_NOOP_IN:
648 if (datalen) {
649 rc = ISCSI_ERR_PROTO;
650 break;
651 }
652
653 if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG))
654 break;
655
656 iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr);
657 break;
658 case ISCSI_OP_REJECT:
659 rc = iscsi_handle_reject(conn, hdr, data, datalen);
660 break;
661 case ISCSI_OP_ASYNC_EVENT:
662 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
663 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
664 rc = ISCSI_ERR_CONN_FAILED;
665 break;
666 default:
667 rc = ISCSI_ERR_BAD_OPCODE;
668 break;
669 }
670 } else
671 rc = ISCSI_ERR_BAD_ITT;
672
673 return rc;
674 }
675 EXPORT_SYMBOL_GPL(__iscsi_complete_pdu);
676
677 int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
678 char *data, int datalen)
679 {
680 int rc;
681
682 spin_lock(&conn->session->lock);
683 rc = __iscsi_complete_pdu(conn, hdr, data, datalen);
684 spin_unlock(&conn->session->lock);
685 return rc;
686 }
687 EXPORT_SYMBOL_GPL(iscsi_complete_pdu);
688
689 /* verify itt (itt encoding: age+cid+itt) */
690 int iscsi_verify_itt(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
691 uint32_t *ret_itt)
692 {
693 struct iscsi_session *session = conn->session;
694 struct iscsi_cmd_task *ctask;
695 uint32_t itt;
696
697 if (hdr->itt != RESERVED_ITT) {
698 if (((__force u32)hdr->itt & ISCSI_AGE_MASK) !=
699 (session->age << ISCSI_AGE_SHIFT)) {
700 printk(KERN_ERR "iscsi: received itt %x expected "
701 "session age (%x)\n", (__force u32)hdr->itt,
702 session->age & ISCSI_AGE_MASK);
703 return ISCSI_ERR_BAD_ITT;
704 }
705
706 if (((__force u32)hdr->itt & ISCSI_CID_MASK) !=
707 (conn->id << ISCSI_CID_SHIFT)) {
708 printk(KERN_ERR "iscsi: received itt %x, expected "
709 "CID (%x)\n", (__force u32)hdr->itt, conn->id);
710 return ISCSI_ERR_BAD_ITT;
711 }
712 itt = get_itt(hdr->itt);
713 } else
714 itt = ~0U;
715
716 if (itt < session->cmds_max) {
717 ctask = session->cmds[itt];
718
719 if (!ctask->sc) {
720 printk(KERN_INFO "iscsi: dropping ctask with "
721 "itt 0x%x\n", ctask->itt);
722 /* force drop */
723 return ISCSI_ERR_NO_SCSI_CMD;
724 }
725
726 if (ctask->sc->SCp.phase != session->age) {
727 printk(KERN_ERR "iscsi: ctask's session age %d, "
728 "expected %d\n", ctask->sc->SCp.phase,
729 session->age);
730 return ISCSI_ERR_SESSION_FAILED;
731 }
732 }
733
734 *ret_itt = itt;
735 return 0;
736 }
737 EXPORT_SYMBOL_GPL(iscsi_verify_itt);
738
739 void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
740 {
741 struct iscsi_session *session = conn->session;
742 unsigned long flags;
743
744 spin_lock_irqsave(&session->lock, flags);
745 if (session->state == ISCSI_STATE_FAILED) {
746 spin_unlock_irqrestore(&session->lock, flags);
747 return;
748 }
749
750 if (conn->stop_stage == 0)
751 session->state = ISCSI_STATE_FAILED;
752 spin_unlock_irqrestore(&session->lock, flags);
753 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
754 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
755 iscsi_conn_error(conn->cls_conn, err);
756 }
757 EXPORT_SYMBOL_GPL(iscsi_conn_failure);
758
759 static void iscsi_prep_mtask(struct iscsi_conn *conn,
760 struct iscsi_mgmt_task *mtask)
761 {
762 struct iscsi_session *session = conn->session;
763 struct iscsi_hdr *hdr = mtask->hdr;
764 struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
765
766 if (hdr->opcode != (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) &&
767 hdr->opcode != (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
768 nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
769 /*
770 * pre-format CmdSN for outgoing PDU.
771 */
772 nop->cmdsn = cpu_to_be32(session->cmdsn);
773 if (hdr->itt != RESERVED_ITT) {
774 hdr->itt = build_itt(mtask->itt, conn->id, session->age);
775 /*
776 * TODO: We always use immediate, so we never hit this.
777 * If we start to send tmfs or nops as non-immediate then
778 * we should start checking the cmdsn numbers for mgmt tasks.
779 */
780 if (conn->c_stage == ISCSI_CONN_STARTED &&
781 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
782 session->queued_cmdsn++;
783 session->cmdsn++;
784 }
785 }
786
787 if (session->tt->init_mgmt_task)
788 session->tt->init_mgmt_task(conn, mtask);
789
790 debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n",
791 hdr->opcode & ISCSI_OPCODE_MASK, hdr->itt,
792 mtask->data_count);
793 }
794
795 static int iscsi_xmit_mtask(struct iscsi_conn *conn)
796 {
797 struct iscsi_hdr *hdr = conn->mtask->hdr;
798 int rc;
799
800 if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT)
801 conn->session->state = ISCSI_STATE_LOGGING_OUT;
802 spin_unlock_bh(&conn->session->lock);
803
804 rc = conn->session->tt->xmit_mgmt_task(conn, conn->mtask);
805 spin_lock_bh(&conn->session->lock);
806 if (rc)
807 return rc;
808
809 /* done with this in-progress mtask */
810 conn->mtask = NULL;
811 return 0;
812 }
813
814 static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn)
815 {
816 struct iscsi_session *session = conn->session;
817
818 /*
819 * Check for iSCSI window and take care of CmdSN wrap-around
820 */
821 if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) {
822 debug_scsi("iSCSI CmdSN closed. ExpCmdSn %u MaxCmdSN %u "
823 "CmdSN %u/%u\n", session->exp_cmdsn,
824 session->max_cmdsn, session->cmdsn,
825 session->queued_cmdsn);
826 return -ENOSPC;
827 }
828 return 0;
829 }
830
831 static int iscsi_xmit_ctask(struct iscsi_conn *conn)
832 {
833 struct iscsi_cmd_task *ctask = conn->ctask;
834 int rc;
835
836 __iscsi_get_ctask(ctask);
837 spin_unlock_bh(&conn->session->lock);
838 rc = conn->session->tt->xmit_cmd_task(conn, ctask);
839 spin_lock_bh(&conn->session->lock);
840 __iscsi_put_ctask(ctask);
841 if (!rc)
842 /* done with this ctask */
843 conn->ctask = NULL;
844 return rc;
845 }
846
847 /**
848 * iscsi_requeue_ctask - requeue ctask to run from session workqueue
849 * @ctask: ctask to requeue
850 *
851 * LLDs that need to run a ctask from the session workqueue should call
852 * this. The session lock must be held.
853 */
854 void iscsi_requeue_ctask(struct iscsi_cmd_task *ctask)
855 {
856 struct iscsi_conn *conn = ctask->conn;
857
858 list_move_tail(&ctask->running, &conn->requeue);
859 scsi_queue_work(conn->session->host, &conn->xmitwork);
860 }
861 EXPORT_SYMBOL_GPL(iscsi_requeue_ctask);
862
863 /**
864 * iscsi_data_xmit - xmit any command into the scheduled connection
865 * @conn: iscsi connection
866 *
867 * Notes:
868 * The function can return -EAGAIN in which case the caller must
869 * re-schedule it again later or recover. '0' return code means
870 * successful xmit.
871 **/
872 static int iscsi_data_xmit(struct iscsi_conn *conn)
873 {
874 int rc = 0;
875
876 spin_lock_bh(&conn->session->lock);
877 if (unlikely(conn->suspend_tx)) {
878 debug_scsi("conn %d Tx suspended!\n", conn->id);
879 spin_unlock_bh(&conn->session->lock);
880 return -ENODATA;
881 }
882
883 if (conn->ctask) {
884 rc = iscsi_xmit_ctask(conn);
885 if (rc)
886 goto again;
887 }
888
889 if (conn->mtask) {
890 rc = iscsi_xmit_mtask(conn);
891 if (rc)
892 goto again;
893 }
894
895 /*
896 * process mgmt pdus like nops before commands since we should
897 * only have one nop-out as a ping from us and targets should not
898 * overflow us with nop-ins
899 */
900 check_mgmt:
901 while (!list_empty(&conn->mgmtqueue)) {
902 conn->mtask = list_entry(conn->mgmtqueue.next,
903 struct iscsi_mgmt_task, running);
904 if (conn->session->state == ISCSI_STATE_LOGGING_OUT) {
905 iscsi_free_mgmt_task(conn, conn->mtask);
906 conn->mtask = NULL;
907 continue;
908 }
909
910 iscsi_prep_mtask(conn, conn->mtask);
911 list_move_tail(conn->mgmtqueue.next, &conn->mgmt_run_list);
912 rc = iscsi_xmit_mtask(conn);
913 if (rc)
914 goto again;
915 }
916
917 /* process pending command queue */
918 while (!list_empty(&conn->xmitqueue)) {
919 if (conn->tmf_state == TMF_QUEUED)
920 break;
921
922 conn->ctask = list_entry(conn->xmitqueue.next,
923 struct iscsi_cmd_task, running);
924 if (conn->session->state == ISCSI_STATE_LOGGING_OUT) {
925 fail_command(conn, conn->ctask, DID_IMM_RETRY << 16);
926 continue;
927 }
928 if (iscsi_prep_scsi_cmd_pdu(conn->ctask)) {
929 fail_command(conn, conn->ctask, DID_ABORT << 16);
930 continue;
931 }
932
933 conn->ctask->state = ISCSI_TASK_RUNNING;
934 list_move_tail(conn->xmitqueue.next, &conn->run_list);
935 rc = iscsi_xmit_ctask(conn);
936 if (rc)
937 goto again;
938 /*
939 * we could continuously get new ctask requests so
940 * we need to check the mgmt queue for nops that need to
941 * be sent to aviod starvation
942 */
943 if (!list_empty(&conn->mgmtqueue))
944 goto check_mgmt;
945 }
946
947 while (!list_empty(&conn->requeue)) {
948 if (conn->session->fast_abort && conn->tmf_state != TMF_INITIAL)
949 break;
950
951 /*
952 * we always do fastlogout - conn stop code will clean up.
953 */
954 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
955 break;
956
957 conn->ctask = list_entry(conn->requeue.next,
958 struct iscsi_cmd_task, running);
959 conn->ctask->state = ISCSI_TASK_RUNNING;
960 list_move_tail(conn->requeue.next, &conn->run_list);
961 rc = iscsi_xmit_ctask(conn);
962 if (rc)
963 goto again;
964 if (!list_empty(&conn->mgmtqueue))
965 goto check_mgmt;
966 }
967 spin_unlock_bh(&conn->session->lock);
968 return -ENODATA;
969
970 again:
971 if (unlikely(conn->suspend_tx))
972 rc = -ENODATA;
973 spin_unlock_bh(&conn->session->lock);
974 return rc;
975 }
976
977 static void iscsi_xmitworker(struct work_struct *work)
978 {
979 struct iscsi_conn *conn =
980 container_of(work, struct iscsi_conn, xmitwork);
981 int rc;
982 /*
983 * serialize Xmit worker on a per-connection basis.
984 */
985 do {
986 rc = iscsi_data_xmit(conn);
987 } while (rc >= 0 || rc == -EAGAIN);
988 }
989
990 enum {
991 FAILURE_BAD_HOST = 1,
992 FAILURE_SESSION_FAILED,
993 FAILURE_SESSION_FREED,
994 FAILURE_WINDOW_CLOSED,
995 FAILURE_OOM,
996 FAILURE_SESSION_TERMINATE,
997 FAILURE_SESSION_IN_RECOVERY,
998 FAILURE_SESSION_RECOVERY_TIMEOUT,
999 FAILURE_SESSION_LOGGING_OUT,
1000 };
1001
1002 int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
1003 {
1004 struct Scsi_Host *host;
1005 int reason = 0;
1006 struct iscsi_session *session;
1007 struct iscsi_conn *conn;
1008 struct iscsi_cmd_task *ctask = NULL;
1009
1010 sc->scsi_done = done;
1011 sc->result = 0;
1012 sc->SCp.ptr = NULL;
1013
1014 host = sc->device->host;
1015 spin_unlock(host->host_lock);
1016
1017 session = iscsi_hostdata(host->hostdata);
1018 spin_lock(&session->lock);
1019
1020 /*
1021 * ISCSI_STATE_FAILED is a temp. state. The recovery
1022 * code will decide what is best to do with command queued
1023 * during this time
1024 */
1025 if (session->state != ISCSI_STATE_LOGGED_IN &&
1026 session->state != ISCSI_STATE_FAILED) {
1027 /*
1028 * to handle the race between when we set the recovery state
1029 * and block the session we requeue here (commands could
1030 * be entering our queuecommand while a block is starting
1031 * up because the block code is not locked)
1032 */
1033 switch (session->state) {
1034 case ISCSI_STATE_IN_RECOVERY:
1035 reason = FAILURE_SESSION_IN_RECOVERY;
1036 goto reject;
1037 case ISCSI_STATE_LOGGING_OUT:
1038 reason = FAILURE_SESSION_LOGGING_OUT;
1039 goto reject;
1040 case ISCSI_STATE_RECOVERY_FAILED:
1041 reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
1042 break;
1043 case ISCSI_STATE_TERMINATE:
1044 reason = FAILURE_SESSION_TERMINATE;
1045 break;
1046 default:
1047 reason = FAILURE_SESSION_FREED;
1048 }
1049 goto fault;
1050 }
1051
1052 conn = session->leadconn;
1053 if (!conn) {
1054 reason = FAILURE_SESSION_FREED;
1055 goto fault;
1056 }
1057
1058 if (iscsi_check_cmdsn_window_closed(conn)) {
1059 reason = FAILURE_WINDOW_CLOSED;
1060 goto reject;
1061 }
1062
1063 if (!__kfifo_get(session->cmdpool.queue, (void*)&ctask,
1064 sizeof(void*))) {
1065 reason = FAILURE_OOM;
1066 goto reject;
1067 }
1068 session->queued_cmdsn++;
1069
1070 sc->SCp.phase = session->age;
1071 sc->SCp.ptr = (char *)ctask;
1072
1073 atomic_set(&ctask->refcount, 1);
1074 ctask->state = ISCSI_TASK_PENDING;
1075 ctask->conn = conn;
1076 ctask->sc = sc;
1077 INIT_LIST_HEAD(&ctask->running);
1078
1079 list_add_tail(&ctask->running, &conn->xmitqueue);
1080 spin_unlock(&session->lock);
1081
1082 scsi_queue_work(host, &conn->xmitwork);
1083 spin_lock(host->host_lock);
1084 return 0;
1085
1086 reject:
1087 spin_unlock(&session->lock);
1088 debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason);
1089 spin_lock(host->host_lock);
1090 return SCSI_MLQUEUE_HOST_BUSY;
1091
1092 fault:
1093 spin_unlock(&session->lock);
1094 printk(KERN_ERR "iscsi: cmd 0x%x is not queued (%d)\n",
1095 sc->cmnd[0], reason);
1096 sc->result = (DID_NO_CONNECT << 16);
1097 scsi_set_resid(sc, scsi_bufflen(sc));
1098 sc->scsi_done(sc);
1099 spin_lock(host->host_lock);
1100 return 0;
1101 }
1102 EXPORT_SYMBOL_GPL(iscsi_queuecommand);
1103
1104 int iscsi_change_queue_depth(struct scsi_device *sdev, int depth)
1105 {
1106 if (depth > ISCSI_MAX_CMD_PER_LUN)
1107 depth = ISCSI_MAX_CMD_PER_LUN;
1108 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
1109 return sdev->queue_depth;
1110 }
1111 EXPORT_SYMBOL_GPL(iscsi_change_queue_depth);
1112
1113 void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
1114 {
1115 struct iscsi_session *session = class_to_transport_session(cls_session);
1116
1117 spin_lock_bh(&session->lock);
1118 if (session->state != ISCSI_STATE_LOGGED_IN) {
1119 session->state = ISCSI_STATE_RECOVERY_FAILED;
1120 if (session->leadconn)
1121 wake_up(&session->leadconn->ehwait);
1122 }
1123 spin_unlock_bh(&session->lock);
1124 }
1125 EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
1126
1127 int iscsi_eh_host_reset(struct scsi_cmnd *sc)
1128 {
1129 struct Scsi_Host *host = sc->device->host;
1130 struct iscsi_session *session = iscsi_hostdata(host->hostdata);
1131 struct iscsi_conn *conn = session->leadconn;
1132
1133 mutex_lock(&session->eh_mutex);
1134 spin_lock_bh(&session->lock);
1135 if (session->state == ISCSI_STATE_TERMINATE) {
1136 failed:
1137 debug_scsi("failing host reset: session terminated "
1138 "[CID %d age %d]\n", conn->id, session->age);
1139 spin_unlock_bh(&session->lock);
1140 mutex_unlock(&session->eh_mutex);
1141 return FAILED;
1142 }
1143
1144 spin_unlock_bh(&session->lock);
1145 mutex_unlock(&session->eh_mutex);
1146 /*
1147 * we drop the lock here but the leadconn cannot be destoyed while
1148 * we are in the scsi eh
1149 */
1150 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1151
1152 debug_scsi("iscsi_eh_host_reset wait for relogin\n");
1153 wait_event_interruptible(conn->ehwait,
1154 session->state == ISCSI_STATE_TERMINATE ||
1155 session->state == ISCSI_STATE_LOGGED_IN ||
1156 session->state == ISCSI_STATE_RECOVERY_FAILED);
1157 if (signal_pending(current))
1158 flush_signals(current);
1159
1160 mutex_lock(&session->eh_mutex);
1161 spin_lock_bh(&session->lock);
1162 if (session->state == ISCSI_STATE_LOGGED_IN)
1163 printk(KERN_INFO "iscsi: host reset succeeded\n");
1164 else
1165 goto failed;
1166 spin_unlock_bh(&session->lock);
1167 mutex_unlock(&session->eh_mutex);
1168 return SUCCESS;
1169 }
1170 EXPORT_SYMBOL_GPL(iscsi_eh_host_reset);
1171
1172 static void iscsi_tmf_timedout(unsigned long data)
1173 {
1174 struct iscsi_conn *conn = (struct iscsi_conn *)data;
1175 struct iscsi_session *session = conn->session;
1176
1177 spin_lock(&session->lock);
1178 if (conn->tmf_state == TMF_QUEUED) {
1179 conn->tmf_state = TMF_TIMEDOUT;
1180 debug_scsi("tmf timedout\n");
1181 /* unblock eh_abort() */
1182 wake_up(&conn->ehwait);
1183 }
1184 spin_unlock(&session->lock);
1185 }
1186
1187 static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn,
1188 struct iscsi_tm *hdr, int age,
1189 int timeout)
1190 {
1191 struct iscsi_session *session = conn->session;
1192 struct iscsi_mgmt_task *mtask;
1193
1194 mtask = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr,
1195 NULL, 0);
1196 if (!mtask) {
1197 spin_unlock_bh(&session->lock);
1198 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1199 spin_lock_bh(&session->lock);
1200 debug_scsi("tmf exec failure\n");
1201 return -EPERM;
1202 }
1203 conn->tmfcmd_pdus_cnt++;
1204 conn->tmf_timer.expires = timeout * HZ + jiffies;
1205 conn->tmf_timer.function = iscsi_tmf_timedout;
1206 conn->tmf_timer.data = (unsigned long)conn;
1207 add_timer(&conn->tmf_timer);
1208 debug_scsi("tmf set timeout\n");
1209
1210 spin_unlock_bh(&session->lock);
1211 mutex_unlock(&session->eh_mutex);
1212 scsi_queue_work(session->host, &conn->xmitwork);
1213
1214 /*
1215 * block eh thread until:
1216 *
1217 * 1) tmf response
1218 * 2) tmf timeout
1219 * 3) session is terminated or restarted or userspace has
1220 * given up on recovery
1221 */
1222 wait_event_interruptible(conn->ehwait, age != session->age ||
1223 session->state != ISCSI_STATE_LOGGED_IN ||
1224 conn->tmf_state != TMF_QUEUED);
1225 if (signal_pending(current))
1226 flush_signals(current);
1227 del_timer_sync(&conn->tmf_timer);
1228
1229 mutex_lock(&session->eh_mutex);
1230 spin_lock_bh(&session->lock);
1231 /* if the session drops it will clean up the mtask */
1232 if (age != session->age ||
1233 session->state != ISCSI_STATE_LOGGED_IN)
1234 return -ENOTCONN;
1235 return 0;
1236 }
1237
1238 /*
1239 * Fail commands. session lock held and recv side suspended and xmit
1240 * thread flushed
1241 */
1242 static void fail_all_commands(struct iscsi_conn *conn, unsigned lun)
1243 {
1244 struct iscsi_cmd_task *ctask, *tmp;
1245
1246 if (conn->ctask && (conn->ctask->sc->device->lun == lun || lun == -1))
1247 conn->ctask = NULL;
1248
1249 /* flush pending */
1250 list_for_each_entry_safe(ctask, tmp, &conn->xmitqueue, running) {
1251 if (lun == ctask->sc->device->lun || lun == -1) {
1252 debug_scsi("failing pending sc %p itt 0x%x\n",
1253 ctask->sc, ctask->itt);
1254 fail_command(conn, ctask, DID_BUS_BUSY << 16);
1255 }
1256 }
1257
1258 list_for_each_entry_safe(ctask, tmp, &conn->requeue, running) {
1259 if (lun == ctask->sc->device->lun || lun == -1) {
1260 debug_scsi("failing requeued sc %p itt 0x%x\n",
1261 ctask->sc, ctask->itt);
1262 fail_command(conn, ctask, DID_BUS_BUSY << 16);
1263 }
1264 }
1265
1266 /* fail all other running */
1267 list_for_each_entry_safe(ctask, tmp, &conn->run_list, running) {
1268 if (lun == ctask->sc->device->lun || lun == -1) {
1269 debug_scsi("failing in progress sc %p itt 0x%x\n",
1270 ctask->sc, ctask->itt);
1271 fail_command(conn, ctask, DID_BUS_BUSY << 16);
1272 }
1273 }
1274 }
1275
1276 static void iscsi_suspend_tx(struct iscsi_conn *conn)
1277 {
1278 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1279 scsi_flush_work(conn->session->host);
1280 }
1281
1282 static void iscsi_start_tx(struct iscsi_conn *conn)
1283 {
1284 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1285 scsi_queue_work(conn->session->host, &conn->xmitwork);
1286 }
1287
1288 static enum scsi_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *scmd)
1289 {
1290 struct iscsi_cls_session *cls_session;
1291 struct iscsi_session *session;
1292 struct iscsi_conn *conn;
1293 enum scsi_eh_timer_return rc = EH_NOT_HANDLED;
1294
1295 cls_session = starget_to_session(scsi_target(scmd->device));
1296 session = class_to_transport_session(cls_session);
1297
1298 debug_scsi("scsi cmd %p timedout\n", scmd);
1299
1300 spin_lock(&session->lock);
1301 if (session->state != ISCSI_STATE_LOGGED_IN) {
1302 /*
1303 * We are probably in the middle of iscsi recovery so let
1304 * that complete and handle the error.
1305 */
1306 rc = EH_RESET_TIMER;
1307 goto done;
1308 }
1309
1310 conn = session->leadconn;
1311 if (!conn) {
1312 /* In the middle of shuting down */
1313 rc = EH_RESET_TIMER;
1314 goto done;
1315 }
1316
1317 if (!conn->recv_timeout && !conn->ping_timeout)
1318 goto done;
1319 /*
1320 * if the ping timedout then we are in the middle of cleaning up
1321 * and can let the iscsi eh handle it
1322 */
1323 if (time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) +
1324 (conn->ping_timeout * HZ), jiffies))
1325 rc = EH_RESET_TIMER;
1326 /*
1327 * if we are about to check the transport then give the command
1328 * more time
1329 */
1330 if (time_before_eq(conn->last_recv + (conn->recv_timeout * HZ),
1331 jiffies))
1332 rc = EH_RESET_TIMER;
1333 /* if in the middle of checking the transport then give us more time */
1334 if (conn->ping_mtask)
1335 rc = EH_RESET_TIMER;
1336 done:
1337 spin_unlock(&session->lock);
1338 debug_scsi("return %s\n", rc == EH_RESET_TIMER ? "timer reset" : "nh");
1339 return rc;
1340 }
1341
1342 static void iscsi_check_transport_timeouts(unsigned long data)
1343 {
1344 struct iscsi_conn *conn = (struct iscsi_conn *)data;
1345 struct iscsi_session *session = conn->session;
1346 unsigned long timeout, next_timeout = 0, last_recv;
1347
1348 spin_lock(&session->lock);
1349 if (session->state != ISCSI_STATE_LOGGED_IN)
1350 goto done;
1351
1352 timeout = conn->recv_timeout;
1353 if (!timeout)
1354 goto done;
1355
1356 timeout *= HZ;
1357 last_recv = conn->last_recv;
1358 if (time_before_eq(last_recv + timeout + (conn->ping_timeout * HZ),
1359 jiffies)) {
1360 printk(KERN_ERR "ping timeout of %d secs expired, "
1361 "last rx %lu, last ping %lu, now %lu\n",
1362 conn->ping_timeout, last_recv,
1363 conn->last_ping, jiffies);
1364 spin_unlock(&session->lock);
1365 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1366 return;
1367 }
1368
1369 if (time_before_eq(last_recv + timeout, jiffies)) {
1370 if (time_before_eq(conn->last_ping, last_recv)) {
1371 /* send a ping to try to provoke some traffic */
1372 debug_scsi("Sending nopout as ping on conn %p\n", conn);
1373 iscsi_send_nopout(conn, NULL);
1374 }
1375 next_timeout = last_recv + timeout + (conn->ping_timeout * HZ);
1376 } else {
1377 next_timeout = last_recv + timeout;
1378 }
1379
1380 if (next_timeout) {
1381 debug_scsi("Setting next tmo %lu\n", next_timeout);
1382 mod_timer(&conn->transport_timer, next_timeout);
1383 }
1384 done:
1385 spin_unlock(&session->lock);
1386 }
1387
1388 static void iscsi_prep_abort_task_pdu(struct iscsi_cmd_task *ctask,
1389 struct iscsi_tm *hdr)
1390 {
1391 memset(hdr, 0, sizeof(*hdr));
1392 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
1393 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK;
1394 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
1395 memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
1396 hdr->rtt = ctask->hdr->itt;
1397 hdr->refcmdsn = ctask->hdr->cmdsn;
1398 }
1399
1400 int iscsi_eh_abort(struct scsi_cmnd *sc)
1401 {
1402 struct Scsi_Host *host = sc->device->host;
1403 struct iscsi_session *session = iscsi_hostdata(host->hostdata);
1404 struct iscsi_conn *conn;
1405 struct iscsi_cmd_task *ctask;
1406 struct iscsi_tm *hdr;
1407 int rc, age;
1408
1409 mutex_lock(&session->eh_mutex);
1410 spin_lock_bh(&session->lock);
1411 /*
1412 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
1413 * got the command.
1414 */
1415 if (!sc->SCp.ptr) {
1416 debug_scsi("sc never reached iscsi layer or it completed.\n");
1417 spin_unlock_bh(&session->lock);
1418 mutex_unlock(&session->eh_mutex);
1419 return SUCCESS;
1420 }
1421
1422 /*
1423 * If we are not logged in or we have started a new session
1424 * then let the host reset code handle this
1425 */
1426 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN ||
1427 sc->SCp.phase != session->age) {
1428 spin_unlock_bh(&session->lock);
1429 mutex_unlock(&session->eh_mutex);
1430 return FAILED;
1431 }
1432
1433 conn = session->leadconn;
1434 conn->eh_abort_cnt++;
1435 age = session->age;
1436
1437 ctask = (struct iscsi_cmd_task *)sc->SCp.ptr;
1438 debug_scsi("aborting [sc %p itt 0x%x]\n", sc, ctask->itt);
1439
1440 /* ctask completed before time out */
1441 if (!ctask->sc) {
1442 debug_scsi("sc completed while abort in progress\n");
1443 goto success;
1444 }
1445
1446 if (ctask->state == ISCSI_TASK_PENDING) {
1447 fail_command(conn, ctask, DID_ABORT << 16);
1448 goto success;
1449 }
1450
1451 /* only have one tmf outstanding at a time */
1452 if (conn->tmf_state != TMF_INITIAL)
1453 goto failed;
1454 conn->tmf_state = TMF_QUEUED;
1455
1456 hdr = &conn->tmhdr;
1457 iscsi_prep_abort_task_pdu(ctask, hdr);
1458
1459 if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout)) {
1460 rc = FAILED;
1461 goto failed;
1462 }
1463
1464 switch (conn->tmf_state) {
1465 case TMF_SUCCESS:
1466 spin_unlock_bh(&session->lock);
1467 iscsi_suspend_tx(conn);
1468 /*
1469 * clean up task if aborted. grab the recv lock as a writer
1470 */
1471 write_lock_bh(conn->recv_lock);
1472 spin_lock(&session->lock);
1473 fail_command(conn, ctask, DID_ABORT << 16);
1474 conn->tmf_state = TMF_INITIAL;
1475 spin_unlock(&session->lock);
1476 write_unlock_bh(conn->recv_lock);
1477 iscsi_start_tx(conn);
1478 goto success_unlocked;
1479 case TMF_TIMEDOUT:
1480 spin_unlock_bh(&session->lock);
1481 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1482 goto failed_unlocked;
1483 case TMF_NOT_FOUND:
1484 if (!sc->SCp.ptr) {
1485 conn->tmf_state = TMF_INITIAL;
1486 /* ctask completed before tmf abort response */
1487 debug_scsi("sc completed while abort in progress\n");
1488 goto success;
1489 }
1490 /* fall through */
1491 default:
1492 conn->tmf_state = TMF_INITIAL;
1493 goto failed;
1494 }
1495
1496 success:
1497 spin_unlock_bh(&session->lock);
1498 success_unlocked:
1499 debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
1500 mutex_unlock(&session->eh_mutex);
1501 return SUCCESS;
1502
1503 failed:
1504 spin_unlock_bh(&session->lock);
1505 failed_unlocked:
1506 debug_scsi("abort failed [sc %p itt 0x%x]\n", sc,
1507 ctask ? ctask->itt : 0);
1508 mutex_unlock(&session->eh_mutex);
1509 return FAILED;
1510 }
1511 EXPORT_SYMBOL_GPL(iscsi_eh_abort);
1512
1513 static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
1514 {
1515 memset(hdr, 0, sizeof(*hdr));
1516 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
1517 hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK;
1518 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
1519 int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun);
1520 hdr->rtt = RESERVED_ITT;
1521 }
1522
1523 int iscsi_eh_device_reset(struct scsi_cmnd *sc)
1524 {
1525 struct Scsi_Host *host = sc->device->host;
1526 struct iscsi_session *session = iscsi_hostdata(host->hostdata);
1527 struct iscsi_conn *conn;
1528 struct iscsi_tm *hdr;
1529 int rc = FAILED;
1530
1531 debug_scsi("LU Reset [sc %p lun %u]\n", sc, sc->device->lun);
1532
1533 mutex_lock(&session->eh_mutex);
1534 spin_lock_bh(&session->lock);
1535 /*
1536 * Just check if we are not logged in. We cannot check for
1537 * the phase because the reset could come from a ioctl.
1538 */
1539 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
1540 goto unlock;
1541 conn = session->leadconn;
1542
1543 /* only have one tmf outstanding at a time */
1544 if (conn->tmf_state != TMF_INITIAL)
1545 goto unlock;
1546 conn->tmf_state = TMF_QUEUED;
1547
1548 hdr = &conn->tmhdr;
1549 iscsi_prep_lun_reset_pdu(sc, hdr);
1550
1551 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
1552 session->lu_reset_timeout)) {
1553 rc = FAILED;
1554 goto unlock;
1555 }
1556
1557 switch (conn->tmf_state) {
1558 case TMF_SUCCESS:
1559 break;
1560 case TMF_TIMEDOUT:
1561 spin_unlock_bh(&session->lock);
1562 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1563 goto done;
1564 default:
1565 conn->tmf_state = TMF_INITIAL;
1566 goto unlock;
1567 }
1568
1569 rc = SUCCESS;
1570 spin_unlock_bh(&session->lock);
1571
1572 iscsi_suspend_tx(conn);
1573 /* need to grab the recv lock then session lock */
1574 write_lock_bh(conn->recv_lock);
1575 spin_lock(&session->lock);
1576 fail_all_commands(conn, sc->device->lun);
1577 conn->tmf_state = TMF_INITIAL;
1578 spin_unlock(&session->lock);
1579 write_unlock_bh(conn->recv_lock);
1580
1581 iscsi_start_tx(conn);
1582 goto done;
1583
1584 unlock:
1585 spin_unlock_bh(&session->lock);
1586 done:
1587 debug_scsi("iscsi_eh_device_reset %s\n",
1588 rc == SUCCESS ? "SUCCESS" : "FAILED");
1589 mutex_unlock(&session->eh_mutex);
1590 return rc;
1591 }
1592 EXPORT_SYMBOL_GPL(iscsi_eh_device_reset);
1593
1594 /*
1595 * Pre-allocate a pool of @max items of @item_size. By default, the pool
1596 * should be accessed via kfifo_{get,put} on q->queue.
1597 * Optionally, the caller can obtain the array of object pointers
1598 * by passing in a non-NULL @items pointer
1599 */
1600 int
1601 iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size)
1602 {
1603 int i, num_arrays = 1;
1604
1605 memset(q, 0, sizeof(*q));
1606
1607 q->max = max;
1608
1609 /* If the user passed an items pointer, he wants a copy of
1610 * the array. */
1611 if (items)
1612 num_arrays++;
1613 q->pool = kzalloc(num_arrays * max * sizeof(void*), GFP_KERNEL);
1614 if (q->pool == NULL)
1615 goto enomem;
1616
1617 q->queue = kfifo_init((void*)q->pool, max * sizeof(void*),
1618 GFP_KERNEL, NULL);
1619 if (q->queue == ERR_PTR(-ENOMEM))
1620 goto enomem;
1621
1622 for (i = 0; i < max; i++) {
1623 q->pool[i] = kzalloc(item_size, GFP_KERNEL);
1624 if (q->pool[i] == NULL) {
1625 q->max = i;
1626 goto enomem;
1627 }
1628 __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*));
1629 }
1630
1631 if (items) {
1632 *items = q->pool + max;
1633 memcpy(*items, q->pool, max * sizeof(void *));
1634 }
1635
1636 return 0;
1637
1638 enomem:
1639 iscsi_pool_free(q);
1640 return -ENOMEM;
1641 }
1642 EXPORT_SYMBOL_GPL(iscsi_pool_init);
1643
1644 void iscsi_pool_free(struct iscsi_pool *q)
1645 {
1646 int i;
1647
1648 for (i = 0; i < q->max; i++)
1649 kfree(q->pool[i]);
1650 if (q->pool)
1651 kfree(q->pool);
1652 }
1653 EXPORT_SYMBOL_GPL(iscsi_pool_free);
1654
1655 /*
1656 * iSCSI Session's hostdata organization:
1657 *
1658 * *------------------* <== hostdata_session(host->hostdata)
1659 * | ptr to class sess|
1660 * |------------------| <== iscsi_hostdata(host->hostdata)
1661 * | iscsi_session |
1662 * *------------------*
1663 */
1664
1665 #define hostdata_privsize(_sz) (sizeof(unsigned long) + _sz + \
1666 _sz % sizeof(unsigned long))
1667
1668 #define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata))
1669
1670 /**
1671 * iscsi_session_setup - create iscsi cls session and host and session
1672 * @scsit: scsi transport template
1673 * @iscsit: iscsi transport template
1674 * @cmds_max: scsi host can queue
1675 * @qdepth: scsi host cmds per lun
1676 * @cmd_task_size: LLD ctask private data size
1677 * @mgmt_task_size: LLD mtask private data size
1678 * @initial_cmdsn: initial CmdSN
1679 * @hostno: host no allocated
1680 *
1681 * This can be used by software iscsi_transports that allocate
1682 * a session per scsi host.
1683 **/
1684 struct iscsi_cls_session *
1685 iscsi_session_setup(struct iscsi_transport *iscsit,
1686 struct scsi_transport_template *scsit,
1687 uint16_t cmds_max, uint16_t qdepth,
1688 int cmd_task_size, int mgmt_task_size,
1689 uint32_t initial_cmdsn, uint32_t *hostno)
1690 {
1691 struct Scsi_Host *shost;
1692 struct iscsi_session *session;
1693 struct iscsi_cls_session *cls_session;
1694 int cmd_i;
1695
1696 if (qdepth > ISCSI_MAX_CMD_PER_LUN || qdepth < 1) {
1697 if (qdepth != 0)
1698 printk(KERN_ERR "iscsi: invalid queue depth of %d. "
1699 "Queue depth must be between 1 and %d.\n",
1700 qdepth, ISCSI_MAX_CMD_PER_LUN);
1701 qdepth = ISCSI_DEF_CMD_PER_LUN;
1702 }
1703
1704 if (!is_power_of_2(cmds_max) ||
1705 cmds_max >= ISCSI_MGMT_ITT_OFFSET) {
1706 if (cmds_max != 0)
1707 printk(KERN_ERR "iscsi: invalid can_queue of %d. "
1708 "can_queue must be a power of 2 and between "
1709 "2 and %d - setting to %d.\n", cmds_max,
1710 ISCSI_MGMT_ITT_OFFSET, ISCSI_DEF_XMIT_CMDS_MAX);
1711 cmds_max = ISCSI_DEF_XMIT_CMDS_MAX;
1712 }
1713
1714 shost = scsi_host_alloc(iscsit->host_template,
1715 hostdata_privsize(sizeof(*session)));
1716 if (!shost)
1717 return NULL;
1718
1719 /* the iscsi layer takes one task for reserve */
1720 shost->can_queue = cmds_max - 1;
1721 shost->cmd_per_lun = qdepth;
1722 shost->max_id = 1;
1723 shost->max_channel = 0;
1724 shost->max_lun = iscsit->max_lun;
1725 shost->max_cmd_len = iscsit->max_cmd_len;
1726 shost->transportt = scsit;
1727 shost->transportt->create_work_queue = 1;
1728 shost->transportt->eh_timed_out = iscsi_eh_cmd_timed_out;
1729 *hostno = shost->host_no;
1730
1731 session = iscsi_hostdata(shost->hostdata);
1732 memset(session, 0, sizeof(struct iscsi_session));
1733 session->host = shost;
1734 session->state = ISCSI_STATE_FREE;
1735 session->fast_abort = 1;
1736 session->lu_reset_timeout = 15;
1737 session->abort_timeout = 10;
1738 session->mgmtpool_max = ISCSI_MGMT_CMDS_MAX;
1739 session->cmds_max = cmds_max;
1740 session->queued_cmdsn = session->cmdsn = initial_cmdsn;
1741 session->exp_cmdsn = initial_cmdsn + 1;
1742 session->max_cmdsn = initial_cmdsn + 1;
1743 session->max_r2t = 1;
1744 session->tt = iscsit;
1745 mutex_init(&session->eh_mutex);
1746
1747 /* initialize SCSI PDU commands pool */
1748 if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
1749 (void***)&session->cmds,
1750 cmd_task_size + sizeof(struct iscsi_cmd_task)))
1751 goto cmdpool_alloc_fail;
1752
1753 /* pre-format cmds pool with ITT */
1754 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
1755 struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
1756
1757 if (cmd_task_size)
1758 ctask->dd_data = &ctask[1];
1759 ctask->itt = cmd_i;
1760 INIT_LIST_HEAD(&ctask->running);
1761 }
1762
1763 spin_lock_init(&session->lock);
1764
1765 /* initialize immediate command pool */
1766 if (iscsi_pool_init(&session->mgmtpool, session->mgmtpool_max,
1767 (void***)&session->mgmt_cmds,
1768 mgmt_task_size + sizeof(struct iscsi_mgmt_task)))
1769 goto mgmtpool_alloc_fail;
1770
1771
1772 /* pre-format immediate cmds pool with ITT */
1773 for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) {
1774 struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i];
1775
1776 if (mgmt_task_size)
1777 mtask->dd_data = &mtask[1];
1778 mtask->itt = ISCSI_MGMT_ITT_OFFSET + cmd_i;
1779 INIT_LIST_HEAD(&mtask->running);
1780 }
1781
1782 if (scsi_add_host(shost, NULL))
1783 goto add_host_fail;
1784
1785 if (!try_module_get(iscsit->owner))
1786 goto cls_session_fail;
1787
1788 cls_session = iscsi_create_session(shost, iscsit, 0);
1789 if (!cls_session)
1790 goto module_put;
1791 *(unsigned long*)shost->hostdata = (unsigned long)cls_session;
1792
1793 return cls_session;
1794
1795 module_put:
1796 module_put(iscsit->owner);
1797 cls_session_fail:
1798 scsi_remove_host(shost);
1799 add_host_fail:
1800 iscsi_pool_free(&session->mgmtpool);
1801 mgmtpool_alloc_fail:
1802 iscsi_pool_free(&session->cmdpool);
1803 cmdpool_alloc_fail:
1804 scsi_host_put(shost);
1805 return NULL;
1806 }
1807 EXPORT_SYMBOL_GPL(iscsi_session_setup);
1808
1809 /**
1810 * iscsi_session_teardown - destroy session, host, and cls_session
1811 * shost: scsi host
1812 *
1813 * This can be used by software iscsi_transports that allocate
1814 * a session per scsi host.
1815 **/
1816 void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
1817 {
1818 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
1819 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
1820 struct module *owner = cls_session->transport->owner;
1821
1822 iscsi_remove_session(cls_session);
1823 scsi_remove_host(shost);
1824
1825 iscsi_pool_free(&session->mgmtpool);
1826 iscsi_pool_free(&session->cmdpool);
1827
1828 kfree(session->password);
1829 kfree(session->password_in);
1830 kfree(session->username);
1831 kfree(session->username_in);
1832 kfree(session->targetname);
1833 kfree(session->netdev);
1834 kfree(session->hwaddress);
1835 kfree(session->initiatorname);
1836
1837 iscsi_free_session(cls_session);
1838 scsi_host_put(shost);
1839 module_put(owner);
1840 }
1841 EXPORT_SYMBOL_GPL(iscsi_session_teardown);
1842
1843 /**
1844 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
1845 * @cls_session: iscsi_cls_session
1846 * @conn_idx: cid
1847 **/
1848 struct iscsi_cls_conn *
1849 iscsi_conn_setup(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
1850 {
1851 struct iscsi_session *session = class_to_transport_session(cls_session);
1852 struct iscsi_conn *conn;
1853 struct iscsi_cls_conn *cls_conn;
1854 char *data;
1855
1856 cls_conn = iscsi_create_conn(cls_session, conn_idx);
1857 if (!cls_conn)
1858 return NULL;
1859 conn = cls_conn->dd_data;
1860 memset(conn, 0, sizeof(*conn));
1861
1862 conn->session = session;
1863 conn->cls_conn = cls_conn;
1864 conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
1865 conn->id = conn_idx;
1866 conn->exp_statsn = 0;
1867 conn->tmf_state = TMF_INITIAL;
1868
1869 init_timer(&conn->transport_timer);
1870 conn->transport_timer.data = (unsigned long)conn;
1871 conn->transport_timer.function = iscsi_check_transport_timeouts;
1872
1873 INIT_LIST_HEAD(&conn->run_list);
1874 INIT_LIST_HEAD(&conn->mgmt_run_list);
1875 INIT_LIST_HEAD(&conn->mgmtqueue);
1876 INIT_LIST_HEAD(&conn->xmitqueue);
1877 INIT_LIST_HEAD(&conn->requeue);
1878 INIT_WORK(&conn->xmitwork, iscsi_xmitworker);
1879
1880 /* allocate login_mtask used for the login/text sequences */
1881 spin_lock_bh(&session->lock);
1882 if (!__kfifo_get(session->mgmtpool.queue,
1883 (void*)&conn->login_mtask,
1884 sizeof(void*))) {
1885 spin_unlock_bh(&session->lock);
1886 goto login_mtask_alloc_fail;
1887 }
1888 spin_unlock_bh(&session->lock);
1889
1890 data = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN, GFP_KERNEL);
1891 if (!data)
1892 goto login_mtask_data_alloc_fail;
1893 conn->login_mtask->data = conn->data = data;
1894
1895 init_timer(&conn->tmf_timer);
1896 init_waitqueue_head(&conn->ehwait);
1897
1898 return cls_conn;
1899
1900 login_mtask_data_alloc_fail:
1901 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
1902 sizeof(void*));
1903 login_mtask_alloc_fail:
1904 iscsi_destroy_conn(cls_conn);
1905 return NULL;
1906 }
1907 EXPORT_SYMBOL_GPL(iscsi_conn_setup);
1908
1909 /**
1910 * iscsi_conn_teardown - teardown iscsi connection
1911 * cls_conn: iscsi class connection
1912 *
1913 * TODO: we may need to make this into a two step process
1914 * like scsi-mls remove + put host
1915 */
1916 void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
1917 {
1918 struct iscsi_conn *conn = cls_conn->dd_data;
1919 struct iscsi_session *session = conn->session;
1920 unsigned long flags;
1921
1922 del_timer_sync(&conn->transport_timer);
1923
1924 spin_lock_bh(&session->lock);
1925 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
1926 if (session->leadconn == conn) {
1927 /*
1928 * leading connection? then give up on recovery.
1929 */
1930 session->state = ISCSI_STATE_TERMINATE;
1931 wake_up(&conn->ehwait);
1932 }
1933 spin_unlock_bh(&session->lock);
1934
1935 /*
1936 * Block until all in-progress commands for this connection
1937 * time out or fail.
1938 */
1939 for (;;) {
1940 spin_lock_irqsave(session->host->host_lock, flags);
1941 if (!session->host->host_busy) { /* OK for ERL == 0 */
1942 spin_unlock_irqrestore(session->host->host_lock, flags);
1943 break;
1944 }
1945 spin_unlock_irqrestore(session->host->host_lock, flags);
1946 msleep_interruptible(500);
1947 printk(KERN_INFO "iscsi: scsi conn_destroy(): host_busy %d "
1948 "host_failed %d\n", session->host->host_busy,
1949 session->host->host_failed);
1950 /*
1951 * force eh_abort() to unblock
1952 */
1953 wake_up(&conn->ehwait);
1954 }
1955
1956 /* flush queued up work because we free the connection below */
1957 iscsi_suspend_tx(conn);
1958
1959 spin_lock_bh(&session->lock);
1960 kfree(conn->data);
1961 kfree(conn->persistent_address);
1962 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
1963 sizeof(void*));
1964 if (session->leadconn == conn)
1965 session->leadconn = NULL;
1966 spin_unlock_bh(&session->lock);
1967
1968 iscsi_destroy_conn(cls_conn);
1969 }
1970 EXPORT_SYMBOL_GPL(iscsi_conn_teardown);
1971
1972 int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
1973 {
1974 struct iscsi_conn *conn = cls_conn->dd_data;
1975 struct iscsi_session *session = conn->session;
1976
1977 if (!session) {
1978 printk(KERN_ERR "iscsi: can't start unbound connection\n");
1979 return -EPERM;
1980 }
1981
1982 if ((session->imm_data_en || !session->initial_r2t_en) &&
1983 session->first_burst > session->max_burst) {
1984 printk("iscsi: invalid burst lengths: "
1985 "first_burst %d max_burst %d\n",
1986 session->first_burst, session->max_burst);
1987 return -EINVAL;
1988 }
1989
1990 if (conn->ping_timeout && !conn->recv_timeout) {
1991 printk(KERN_ERR "iscsi: invalid recv timeout of zero "
1992 "Using 5 seconds\n.");
1993 conn->recv_timeout = 5;
1994 }
1995
1996 if (conn->recv_timeout && !conn->ping_timeout) {
1997 printk(KERN_ERR "iscsi: invalid ping timeout of zero "
1998 "Using 5 seconds.\n");
1999 conn->ping_timeout = 5;
2000 }
2001
2002 spin_lock_bh(&session->lock);
2003 conn->c_stage = ISCSI_CONN_STARTED;
2004 session->state = ISCSI_STATE_LOGGED_IN;
2005 session->queued_cmdsn = session->cmdsn;
2006
2007 conn->last_recv = jiffies;
2008 conn->last_ping = jiffies;
2009 if (conn->recv_timeout && conn->ping_timeout)
2010 mod_timer(&conn->transport_timer,
2011 jiffies + (conn->recv_timeout * HZ));
2012
2013 switch(conn->stop_stage) {
2014 case STOP_CONN_RECOVER:
2015 /*
2016 * unblock eh_abort() if it is blocked. re-try all
2017 * commands after successful recovery
2018 */
2019 conn->stop_stage = 0;
2020 conn->tmf_state = TMF_INITIAL;
2021 session->age++;
2022 spin_unlock_bh(&session->lock);
2023
2024 iscsi_unblock_session(session_to_cls(session));
2025 wake_up(&conn->ehwait);
2026 return 0;
2027 case STOP_CONN_TERM:
2028 conn->stop_stage = 0;
2029 break;
2030 default:
2031 break;
2032 }
2033 spin_unlock_bh(&session->lock);
2034
2035 return 0;
2036 }
2037 EXPORT_SYMBOL_GPL(iscsi_conn_start);
2038
2039 static void
2040 flush_control_queues(struct iscsi_session *session, struct iscsi_conn *conn)
2041 {
2042 struct iscsi_mgmt_task *mtask, *tmp;
2043
2044 /* handle pending */
2045 list_for_each_entry_safe(mtask, tmp, &conn->mgmtqueue, running) {
2046 debug_scsi("flushing pending mgmt task itt 0x%x\n", mtask->itt);
2047 iscsi_free_mgmt_task(conn, mtask);
2048 }
2049
2050 /* handle running */
2051 list_for_each_entry_safe(mtask, tmp, &conn->mgmt_run_list, running) {
2052 debug_scsi("flushing running mgmt task itt 0x%x\n", mtask->itt);
2053 iscsi_free_mgmt_task(conn, mtask);
2054 }
2055
2056 conn->mtask = NULL;
2057 }
2058
2059 static void iscsi_start_session_recovery(struct iscsi_session *session,
2060 struct iscsi_conn *conn, int flag)
2061 {
2062 int old_stop_stage;
2063
2064 del_timer_sync(&conn->transport_timer);
2065
2066 mutex_lock(&session->eh_mutex);
2067 spin_lock_bh(&session->lock);
2068 if (conn->stop_stage == STOP_CONN_TERM) {
2069 spin_unlock_bh(&session->lock);
2070 mutex_unlock(&session->eh_mutex);
2071 return;
2072 }
2073
2074 /*
2075 * The LLD either freed/unset the lock on us, or userspace called
2076 * stop but did not create a proper connection (connection was never
2077 * bound or it was unbound then stop was called).
2078 */
2079 if (!conn->recv_lock) {
2080 spin_unlock_bh(&session->lock);
2081 mutex_unlock(&session->eh_mutex);
2082 return;
2083 }
2084
2085 /*
2086 * When this is called for the in_login state, we only want to clean
2087 * up the login task and connection. We do not need to block and set
2088 * the recovery state again
2089 */
2090 if (flag == STOP_CONN_TERM)
2091 session->state = ISCSI_STATE_TERMINATE;
2092 else if (conn->stop_stage != STOP_CONN_RECOVER)
2093 session->state = ISCSI_STATE_IN_RECOVERY;
2094
2095 old_stop_stage = conn->stop_stage;
2096 conn->stop_stage = flag;
2097 conn->c_stage = ISCSI_CONN_STOPPED;
2098 spin_unlock_bh(&session->lock);
2099
2100 iscsi_suspend_tx(conn);
2101
2102 write_lock_bh(conn->recv_lock);
2103 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
2104 write_unlock_bh(conn->recv_lock);
2105
2106 /*
2107 * for connection level recovery we should not calculate
2108 * header digest. conn->hdr_size used for optimization
2109 * in hdr_extract() and will be re-negotiated at
2110 * set_param() time.
2111 */
2112 if (flag == STOP_CONN_RECOVER) {
2113 conn->hdrdgst_en = 0;
2114 conn->datadgst_en = 0;
2115 if (session->state == ISCSI_STATE_IN_RECOVERY &&
2116 old_stop_stage != STOP_CONN_RECOVER) {
2117 debug_scsi("blocking session\n");
2118 iscsi_block_session(session_to_cls(session));
2119 }
2120 }
2121
2122 /*
2123 * flush queues.
2124 */
2125 spin_lock_bh(&session->lock);
2126 fail_all_commands(conn, -1);
2127 flush_control_queues(session, conn);
2128 spin_unlock_bh(&session->lock);
2129 mutex_unlock(&session->eh_mutex);
2130 }
2131
2132 void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
2133 {
2134 struct iscsi_conn *conn = cls_conn->dd_data;
2135 struct iscsi_session *session = conn->session;
2136
2137 switch (flag) {
2138 case STOP_CONN_RECOVER:
2139 case STOP_CONN_TERM:
2140 iscsi_start_session_recovery(session, conn, flag);
2141 break;
2142 default:
2143 printk(KERN_ERR "iscsi: invalid stop flag %d\n", flag);
2144 }
2145 }
2146 EXPORT_SYMBOL_GPL(iscsi_conn_stop);
2147
2148 int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
2149 struct iscsi_cls_conn *cls_conn, int is_leading)
2150 {
2151 struct iscsi_session *session = class_to_transport_session(cls_session);
2152 struct iscsi_conn *conn = cls_conn->dd_data;
2153
2154 spin_lock_bh(&session->lock);
2155 if (is_leading)
2156 session->leadconn = conn;
2157 spin_unlock_bh(&session->lock);
2158
2159 /*
2160 * Unblock xmitworker(), Login Phase will pass through.
2161 */
2162 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
2163 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
2164 return 0;
2165 }
2166 EXPORT_SYMBOL_GPL(iscsi_conn_bind);
2167
2168
2169 int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
2170 enum iscsi_param param, char *buf, int buflen)
2171 {
2172 struct iscsi_conn *conn = cls_conn->dd_data;
2173 struct iscsi_session *session = conn->session;
2174 uint32_t value;
2175
2176 switch(param) {
2177 case ISCSI_PARAM_FAST_ABORT:
2178 sscanf(buf, "%d", &session->fast_abort);
2179 break;
2180 case ISCSI_PARAM_ABORT_TMO:
2181 sscanf(buf, "%d", &session->abort_timeout);
2182 break;
2183 case ISCSI_PARAM_LU_RESET_TMO:
2184 sscanf(buf, "%d", &session->lu_reset_timeout);
2185 break;
2186 case ISCSI_PARAM_PING_TMO:
2187 sscanf(buf, "%d", &conn->ping_timeout);
2188 break;
2189 case ISCSI_PARAM_RECV_TMO:
2190 sscanf(buf, "%d", &conn->recv_timeout);
2191 break;
2192 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2193 sscanf(buf, "%d", &conn->max_recv_dlength);
2194 break;
2195 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2196 sscanf(buf, "%d", &conn->max_xmit_dlength);
2197 break;
2198 case ISCSI_PARAM_HDRDGST_EN:
2199 sscanf(buf, "%d", &conn->hdrdgst_en);
2200 break;
2201 case ISCSI_PARAM_DATADGST_EN:
2202 sscanf(buf, "%d", &conn->datadgst_en);
2203 break;
2204 case ISCSI_PARAM_INITIAL_R2T_EN:
2205 sscanf(buf, "%d", &session->initial_r2t_en);
2206 break;
2207 case ISCSI_PARAM_MAX_R2T:
2208 sscanf(buf, "%d", &session->max_r2t);
2209 break;
2210 case ISCSI_PARAM_IMM_DATA_EN:
2211 sscanf(buf, "%d", &session->imm_data_en);
2212 break;
2213 case ISCSI_PARAM_FIRST_BURST:
2214 sscanf(buf, "%d", &session->first_burst);
2215 break;
2216 case ISCSI_PARAM_MAX_BURST:
2217 sscanf(buf, "%d", &session->max_burst);
2218 break;
2219 case ISCSI_PARAM_PDU_INORDER_EN:
2220 sscanf(buf, "%d", &session->pdu_inorder_en);
2221 break;
2222 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2223 sscanf(buf, "%d", &session->dataseq_inorder_en);
2224 break;
2225 case ISCSI_PARAM_ERL:
2226 sscanf(buf, "%d", &session->erl);
2227 break;
2228 case ISCSI_PARAM_IFMARKER_EN:
2229 sscanf(buf, "%d", &value);
2230 BUG_ON(value);
2231 break;
2232 case ISCSI_PARAM_OFMARKER_EN:
2233 sscanf(buf, "%d", &value);
2234 BUG_ON(value);
2235 break;
2236 case ISCSI_PARAM_EXP_STATSN:
2237 sscanf(buf, "%u", &conn->exp_statsn);
2238 break;
2239 case ISCSI_PARAM_USERNAME:
2240 kfree(session->username);
2241 session->username = kstrdup(buf, GFP_KERNEL);
2242 if (!session->username)
2243 return -ENOMEM;
2244 break;
2245 case ISCSI_PARAM_USERNAME_IN:
2246 kfree(session->username_in);
2247 session->username_in = kstrdup(buf, GFP_KERNEL);
2248 if (!session->username_in)
2249 return -ENOMEM;
2250 break;
2251 case ISCSI_PARAM_PASSWORD:
2252 kfree(session->password);
2253 session->password = kstrdup(buf, GFP_KERNEL);
2254 if (!session->password)
2255 return -ENOMEM;
2256 break;
2257 case ISCSI_PARAM_PASSWORD_IN:
2258 kfree(session->password_in);
2259 session->password_in = kstrdup(buf, GFP_KERNEL);
2260 if (!session->password_in)
2261 return -ENOMEM;
2262 break;
2263 case ISCSI_PARAM_TARGET_NAME:
2264 /* this should not change between logins */
2265 if (session->targetname)
2266 break;
2267
2268 session->targetname = kstrdup(buf, GFP_KERNEL);
2269 if (!session->targetname)
2270 return -ENOMEM;
2271 break;
2272 case ISCSI_PARAM_TPGT:
2273 sscanf(buf, "%d", &session->tpgt);
2274 break;
2275 case ISCSI_PARAM_PERSISTENT_PORT:
2276 sscanf(buf, "%d", &conn->persistent_port);
2277 break;
2278 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2279 /*
2280 * this is the address returned in discovery so it should
2281 * not change between logins.
2282 */
2283 if (conn->persistent_address)
2284 break;
2285
2286 conn->persistent_address = kstrdup(buf, GFP_KERNEL);
2287 if (!conn->persistent_address)
2288 return -ENOMEM;
2289 break;
2290 default:
2291 return -ENOSYS;
2292 }
2293
2294 return 0;
2295 }
2296 EXPORT_SYMBOL_GPL(iscsi_set_param);
2297
2298 int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
2299 enum iscsi_param param, char *buf)
2300 {
2301 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
2302 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
2303 int len;
2304
2305 switch(param) {
2306 case ISCSI_PARAM_FAST_ABORT:
2307 len = sprintf(buf, "%d\n", session->fast_abort);
2308 break;
2309 case ISCSI_PARAM_ABORT_TMO:
2310 len = sprintf(buf, "%d\n", session->abort_timeout);
2311 break;
2312 case ISCSI_PARAM_LU_RESET_TMO:
2313 len = sprintf(buf, "%d\n", session->lu_reset_timeout);
2314 break;
2315 case ISCSI_PARAM_INITIAL_R2T_EN:
2316 len = sprintf(buf, "%d\n", session->initial_r2t_en);
2317 break;
2318 case ISCSI_PARAM_MAX_R2T:
2319 len = sprintf(buf, "%hu\n", session->max_r2t);
2320 break;
2321 case ISCSI_PARAM_IMM_DATA_EN:
2322 len = sprintf(buf, "%d\n", session->imm_data_en);
2323 break;
2324 case ISCSI_PARAM_FIRST_BURST:
2325 len = sprintf(buf, "%u\n", session->first_burst);
2326 break;
2327 case ISCSI_PARAM_MAX_BURST:
2328 len = sprintf(buf, "%u\n", session->max_burst);
2329 break;
2330 case ISCSI_PARAM_PDU_INORDER_EN:
2331 len = sprintf(buf, "%d\n", session->pdu_inorder_en);
2332 break;
2333 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2334 len = sprintf(buf, "%d\n", session->dataseq_inorder_en);
2335 break;
2336 case ISCSI_PARAM_ERL:
2337 len = sprintf(buf, "%d\n", session->erl);
2338 break;
2339 case ISCSI_PARAM_TARGET_NAME:
2340 len = sprintf(buf, "%s\n", session->targetname);
2341 break;
2342 case ISCSI_PARAM_TPGT:
2343 len = sprintf(buf, "%d\n", session->tpgt);
2344 break;
2345 case ISCSI_PARAM_USERNAME:
2346 len = sprintf(buf, "%s\n", session->username);
2347 break;
2348 case ISCSI_PARAM_USERNAME_IN:
2349 len = sprintf(buf, "%s\n", session->username_in);
2350 break;
2351 case ISCSI_PARAM_PASSWORD:
2352 len = sprintf(buf, "%s\n", session->password);
2353 break;
2354 case ISCSI_PARAM_PASSWORD_IN:
2355 len = sprintf(buf, "%s\n", session->password_in);
2356 break;
2357 default:
2358 return -ENOSYS;
2359 }
2360
2361 return len;
2362 }
2363 EXPORT_SYMBOL_GPL(iscsi_session_get_param);
2364
2365 int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
2366 enum iscsi_param param, char *buf)
2367 {
2368 struct iscsi_conn *conn = cls_conn->dd_data;
2369 int len;
2370
2371 switch(param) {
2372 case ISCSI_PARAM_PING_TMO:
2373 len = sprintf(buf, "%u\n", conn->ping_timeout);
2374 break;
2375 case ISCSI_PARAM_RECV_TMO:
2376 len = sprintf(buf, "%u\n", conn->recv_timeout);
2377 break;
2378 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2379 len = sprintf(buf, "%u\n", conn->max_recv_dlength);
2380 break;
2381 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2382 len = sprintf(buf, "%u\n", conn->max_xmit_dlength);
2383 break;
2384 case ISCSI_PARAM_HDRDGST_EN:
2385 len = sprintf(buf, "%d\n", conn->hdrdgst_en);
2386 break;
2387 case ISCSI_PARAM_DATADGST_EN:
2388 len = sprintf(buf, "%d\n", conn->datadgst_en);
2389 break;
2390 case ISCSI_PARAM_IFMARKER_EN:
2391 len = sprintf(buf, "%d\n", conn->ifmarker_en);
2392 break;
2393 case ISCSI_PARAM_OFMARKER_EN:
2394 len = sprintf(buf, "%d\n", conn->ofmarker_en);
2395 break;
2396 case ISCSI_PARAM_EXP_STATSN:
2397 len = sprintf(buf, "%u\n", conn->exp_statsn);
2398 break;
2399 case ISCSI_PARAM_PERSISTENT_PORT:
2400 len = sprintf(buf, "%d\n", conn->persistent_port);
2401 break;
2402 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2403 len = sprintf(buf, "%s\n", conn->persistent_address);
2404 break;
2405 default:
2406 return -ENOSYS;
2407 }
2408
2409 return len;
2410 }
2411 EXPORT_SYMBOL_GPL(iscsi_conn_get_param);
2412
2413 int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2414 char *buf)
2415 {
2416 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
2417 int len;
2418
2419 switch (param) {
2420 case ISCSI_HOST_PARAM_NETDEV_NAME:
2421 if (!session->netdev)
2422 len = sprintf(buf, "%s\n", "default");
2423 else
2424 len = sprintf(buf, "%s\n", session->netdev);
2425 break;
2426 case ISCSI_HOST_PARAM_HWADDRESS:
2427 if (!session->hwaddress)
2428 len = sprintf(buf, "%s\n", "default");
2429 else
2430 len = sprintf(buf, "%s\n", session->hwaddress);
2431 break;
2432 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2433 if (!session->initiatorname)
2434 len = sprintf(buf, "%s\n", "unknown");
2435 else
2436 len = sprintf(buf, "%s\n", session->initiatorname);
2437 break;
2438
2439 default:
2440 return -ENOSYS;
2441 }
2442
2443 return len;
2444 }
2445 EXPORT_SYMBOL_GPL(iscsi_host_get_param);
2446
2447 int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2448 char *buf, int buflen)
2449 {
2450 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
2451
2452 switch (param) {
2453 case ISCSI_HOST_PARAM_NETDEV_NAME:
2454 if (!session->netdev)
2455 session->netdev = kstrdup(buf, GFP_KERNEL);
2456 break;
2457 case ISCSI_HOST_PARAM_HWADDRESS:
2458 if (!session->hwaddress)
2459 session->hwaddress = kstrdup(buf, GFP_KERNEL);
2460 break;
2461 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2462 if (!session->initiatorname)
2463 session->initiatorname = kstrdup(buf, GFP_KERNEL);
2464 break;
2465 default:
2466 return -ENOSYS;
2467 }
2468
2469 return 0;
2470 }
2471 EXPORT_SYMBOL_GPL(iscsi_host_set_param);
2472
2473 MODULE_AUTHOR("Mike Christie");
2474 MODULE_DESCRIPTION("iSCSI library functions");
2475 MODULE_LICENSE("GPL");
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