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[SCSI] libiscsi: make __iscsi_complete_pdu() static
[linux-2.6/s3c2410-cpufreq.git] / drivers / scsi / libiscsi.c
blobe7942628ac4aa4824c10d08066a5eff86e13fe20
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 static 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
676 int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
677 char *data, int datalen)
678 {
679 int rc;
680
681 spin_lock(&conn->session->lock);
682 rc = __iscsi_complete_pdu(conn, hdr, data, datalen);
683 spin_unlock(&conn->session->lock);
684 return rc;
685 }
686 EXPORT_SYMBOL_GPL(iscsi_complete_pdu);
687
688 /* verify itt (itt encoding: age+cid+itt) */
689 int iscsi_verify_itt(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
690 uint32_t *ret_itt)
691 {
692 struct iscsi_session *session = conn->session;
693 struct iscsi_cmd_task *ctask;
694 uint32_t itt;
695
696 if (hdr->itt != RESERVED_ITT) {
697 if (((__force u32)hdr->itt & ISCSI_AGE_MASK) !=
698 (session->age << ISCSI_AGE_SHIFT)) {
699 printk(KERN_ERR "iscsi: received itt %x expected "
700 "session age (%x)\n", (__force u32)hdr->itt,
701 session->age & ISCSI_AGE_MASK);
702 return ISCSI_ERR_BAD_ITT;
703 }
704
705 if (((__force u32)hdr->itt & ISCSI_CID_MASK) !=
706 (conn->id << ISCSI_CID_SHIFT)) {
707 printk(KERN_ERR "iscsi: received itt %x, expected "
708 "CID (%x)\n", (__force u32)hdr->itt, conn->id);
709 return ISCSI_ERR_BAD_ITT;
710 }
711 itt = get_itt(hdr->itt);
712 } else
713 itt = ~0U;
714
715 if (itt < session->cmds_max) {
716 ctask = session->cmds[itt];
717
718 if (!ctask->sc) {
719 printk(KERN_INFO "iscsi: dropping ctask with "
720 "itt 0x%x\n", ctask->itt);
721 /* force drop */
722 return ISCSI_ERR_NO_SCSI_CMD;
723 }
724
725 if (ctask->sc->SCp.phase != session->age) {
726 printk(KERN_ERR "iscsi: ctask's session age %d, "
727 "expected %d\n", ctask->sc->SCp.phase,
728 session->age);
729 return ISCSI_ERR_SESSION_FAILED;
730 }
731 }
732
733 *ret_itt = itt;
734 return 0;
735 }
736 EXPORT_SYMBOL_GPL(iscsi_verify_itt);
737
738 void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
739 {
740 struct iscsi_session *session = conn->session;
741 unsigned long flags;
742
743 spin_lock_irqsave(&session->lock, flags);
744 if (session->state == ISCSI_STATE_FAILED) {
745 spin_unlock_irqrestore(&session->lock, flags);
746 return;
747 }
748
749 if (conn->stop_stage == 0)
750 session->state = ISCSI_STATE_FAILED;
751 spin_unlock_irqrestore(&session->lock, flags);
752 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
753 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
754 iscsi_conn_error(conn->cls_conn, err);
755 }
756 EXPORT_SYMBOL_GPL(iscsi_conn_failure);
757
758 static void iscsi_prep_mtask(struct iscsi_conn *conn,
759 struct iscsi_mgmt_task *mtask)
760 {
761 struct iscsi_session *session = conn->session;
762 struct iscsi_hdr *hdr = mtask->hdr;
763 struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
764
765 if (hdr->opcode != (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) &&
766 hdr->opcode != (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
767 nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
768 /*
769 * pre-format CmdSN for outgoing PDU.
770 */
771 nop->cmdsn = cpu_to_be32(session->cmdsn);
772 if (hdr->itt != RESERVED_ITT) {
773 hdr->itt = build_itt(mtask->itt, conn->id, session->age);
774 /*
775 * TODO: We always use immediate, so we never hit this.
776 * If we start to send tmfs or nops as non-immediate then
777 * we should start checking the cmdsn numbers for mgmt tasks.
778 */
779 if (conn->c_stage == ISCSI_CONN_STARTED &&
780 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
781 session->queued_cmdsn++;
782 session->cmdsn++;
783 }
784 }
785
786 if (session->tt->init_mgmt_task)
787 session->tt->init_mgmt_task(conn, mtask);
788
789 debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n",
790 hdr->opcode & ISCSI_OPCODE_MASK, hdr->itt,
791 mtask->data_count);
792 }
793
794 static int iscsi_xmit_mtask(struct iscsi_conn *conn)
795 {
796 struct iscsi_hdr *hdr = conn->mtask->hdr;
797 int rc;
798
799 if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT)
800 conn->session->state = ISCSI_STATE_LOGGING_OUT;
801 spin_unlock_bh(&conn->session->lock);
802
803 rc = conn->session->tt->xmit_mgmt_task(conn, conn->mtask);
804 spin_lock_bh(&conn->session->lock);
805 if (rc)
806 return rc;
807
808 /* done with this in-progress mtask */
809 conn->mtask = NULL;
810 return 0;
811 }
812
813 static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn)
814 {
815 struct iscsi_session *session = conn->session;
816
817 /*
818 * Check for iSCSI window and take care of CmdSN wrap-around
819 */
820 if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) {
821 debug_scsi("iSCSI CmdSN closed. ExpCmdSn %u MaxCmdSN %u "
822 "CmdSN %u/%u\n", session->exp_cmdsn,
823 session->max_cmdsn, session->cmdsn,
824 session->queued_cmdsn);
825 return -ENOSPC;
826 }
827 return 0;
828 }
829
830 static int iscsi_xmit_ctask(struct iscsi_conn *conn)
831 {
832 struct iscsi_cmd_task *ctask = conn->ctask;
833 int rc;
834
835 __iscsi_get_ctask(ctask);
836 spin_unlock_bh(&conn->session->lock);
837 rc = conn->session->tt->xmit_cmd_task(conn, ctask);
838 spin_lock_bh(&conn->session->lock);
839 __iscsi_put_ctask(ctask);
840 if (!rc)
841 /* done with this ctask */
842 conn->ctask = NULL;
843 return rc;
844 }
845
846 /**
847 * iscsi_requeue_ctask - requeue ctask to run from session workqueue
848 * @ctask: ctask to requeue
849 *
850 * LLDs that need to run a ctask from the session workqueue should call
851 * this. The session lock must be held.
852 */
853 void iscsi_requeue_ctask(struct iscsi_cmd_task *ctask)
854 {
855 struct iscsi_conn *conn = ctask->conn;
856
857 list_move_tail(&ctask->running, &conn->requeue);
858 scsi_queue_work(conn->session->host, &conn->xmitwork);
859 }
860 EXPORT_SYMBOL_GPL(iscsi_requeue_ctask);
861
862 /**
863 * iscsi_data_xmit - xmit any command into the scheduled connection
864 * @conn: iscsi connection
865 *
866 * Notes:
867 * The function can return -EAGAIN in which case the caller must
868 * re-schedule it again later or recover. '0' return code means
869 * successful xmit.
870 **/
871 static int iscsi_data_xmit(struct iscsi_conn *conn)
872 {
873 int rc = 0;
874
875 spin_lock_bh(&conn->session->lock);
876 if (unlikely(conn->suspend_tx)) {
877 debug_scsi("conn %d Tx suspended!\n", conn->id);
878 spin_unlock_bh(&conn->session->lock);
879 return -ENODATA;
880 }
881
882 if (conn->ctask) {
883 rc = iscsi_xmit_ctask(conn);
884 if (rc)
885 goto again;
886 }
887
888 if (conn->mtask) {
889 rc = iscsi_xmit_mtask(conn);
890 if (rc)
891 goto again;
892 }
893
894 /*
895 * process mgmt pdus like nops before commands since we should
896 * only have one nop-out as a ping from us and targets should not
897 * overflow us with nop-ins
898 */
899 check_mgmt:
900 while (!list_empty(&conn->mgmtqueue)) {
901 conn->mtask = list_entry(conn->mgmtqueue.next,
902 struct iscsi_mgmt_task, running);
903 if (conn->session->state == ISCSI_STATE_LOGGING_OUT) {
904 iscsi_free_mgmt_task(conn, conn->mtask);
905 conn->mtask = NULL;
906 continue;
907 }
908
909 iscsi_prep_mtask(conn, conn->mtask);
910 list_move_tail(conn->mgmtqueue.next, &conn->mgmt_run_list);
911 rc = iscsi_xmit_mtask(conn);
912 if (rc)
913 goto again;
914 }
915
916 /* process pending command queue */
917 while (!list_empty(&conn->xmitqueue)) {
918 if (conn->tmf_state == TMF_QUEUED)
919 break;
920
921 conn->ctask = list_entry(conn->xmitqueue.next,
922 struct iscsi_cmd_task, running);
923 if (conn->session->state == ISCSI_STATE_LOGGING_OUT) {
924 fail_command(conn, conn->ctask, DID_IMM_RETRY << 16);
925 continue;
926 }
927 if (iscsi_prep_scsi_cmd_pdu(conn->ctask)) {
928 fail_command(conn, conn->ctask, DID_ABORT << 16);
929 continue;
930 }
931
932 conn->ctask->state = ISCSI_TASK_RUNNING;
933 list_move_tail(conn->xmitqueue.next, &conn->run_list);
934 rc = iscsi_xmit_ctask(conn);
935 if (rc)
936 goto again;
937 /*
938 * we could continuously get new ctask requests so
939 * we need to check the mgmt queue for nops that need to
940 * be sent to aviod starvation
941 */
942 if (!list_empty(&conn->mgmtqueue))
943 goto check_mgmt;
944 }
945
946 while (!list_empty(&conn->requeue)) {
947 if (conn->session->fast_abort && conn->tmf_state != TMF_INITIAL)
948 break;
949
950 /*
951 * we always do fastlogout - conn stop code will clean up.
952 */
953 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
954 break;
955
956 conn->ctask = list_entry(conn->requeue.next,
957 struct iscsi_cmd_task, running);
958 conn->ctask->state = ISCSI_TASK_RUNNING;
959 list_move_tail(conn->requeue.next, &conn->run_list);
960 rc = iscsi_xmit_ctask(conn);
961 if (rc)
962 goto again;
963 if (!list_empty(&conn->mgmtqueue))
964 goto check_mgmt;
965 }
966 spin_unlock_bh(&conn->session->lock);
967 return -ENODATA;
968
969 again:
970 if (unlikely(conn->suspend_tx))
971 rc = -ENODATA;
972 spin_unlock_bh(&conn->session->lock);
973 return rc;
974 }
975
976 static void iscsi_xmitworker(struct work_struct *work)
977 {
978 struct iscsi_conn *conn =
979 container_of(work, struct iscsi_conn, xmitwork);
980 int rc;
981 /*
982 * serialize Xmit worker on a per-connection basis.
983 */
984 do {
985 rc = iscsi_data_xmit(conn);
986 } while (rc >= 0 || rc == -EAGAIN);
987 }
988
989 enum {
990 FAILURE_BAD_HOST = 1,
991 FAILURE_SESSION_FAILED,
992 FAILURE_SESSION_FREED,
993 FAILURE_WINDOW_CLOSED,
994 FAILURE_OOM,
995 FAILURE_SESSION_TERMINATE,
996 FAILURE_SESSION_IN_RECOVERY,
997 FAILURE_SESSION_RECOVERY_TIMEOUT,
998 FAILURE_SESSION_LOGGING_OUT,
999 };
1000
1001 int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
1002 {
1003 struct Scsi_Host *host;
1004 int reason = 0;
1005 struct iscsi_session *session;
1006 struct iscsi_conn *conn;
1007 struct iscsi_cmd_task *ctask = NULL;
1008
1009 sc->scsi_done = done;
1010 sc->result = 0;
1011 sc->SCp.ptr = NULL;
1012
1013 host = sc->device->host;
1014 spin_unlock(host->host_lock);
1015
1016 session = iscsi_hostdata(host->hostdata);
1017 spin_lock(&session->lock);
1018
1019 /*
1020 * ISCSI_STATE_FAILED is a temp. state. The recovery
1021 * code will decide what is best to do with command queued
1022 * during this time
1023 */
1024 if (session->state != ISCSI_STATE_LOGGED_IN &&
1025 session->state != ISCSI_STATE_FAILED) {
1026 /*
1027 * to handle the race between when we set the recovery state
1028 * and block the session we requeue here (commands could
1029 * be entering our queuecommand while a block is starting
1030 * up because the block code is not locked)
1031 */
1032 switch (session->state) {
1033 case ISCSI_STATE_IN_RECOVERY:
1034 reason = FAILURE_SESSION_IN_RECOVERY;
1035 goto reject;
1036 case ISCSI_STATE_LOGGING_OUT:
1037 reason = FAILURE_SESSION_LOGGING_OUT;
1038 goto reject;
1039 case ISCSI_STATE_RECOVERY_FAILED:
1040 reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
1041 break;
1042 case ISCSI_STATE_TERMINATE:
1043 reason = FAILURE_SESSION_TERMINATE;
1044 break;
1045 default:
1046 reason = FAILURE_SESSION_FREED;
1047 }
1048 goto fault;
1049 }
1050
1051 conn = session->leadconn;
1052 if (!conn) {
1053 reason = FAILURE_SESSION_FREED;
1054 goto fault;
1055 }
1056
1057 if (iscsi_check_cmdsn_window_closed(conn)) {
1058 reason = FAILURE_WINDOW_CLOSED;
1059 goto reject;
1060 }
1061
1062 if (!__kfifo_get(session->cmdpool.queue, (void*)&ctask,
1063 sizeof(void*))) {
1064 reason = FAILURE_OOM;
1065 goto reject;
1066 }
1067 session->queued_cmdsn++;
1068
1069 sc->SCp.phase = session->age;
1070 sc->SCp.ptr = (char *)ctask;
1071
1072 atomic_set(&ctask->refcount, 1);
1073 ctask->state = ISCSI_TASK_PENDING;
1074 ctask->conn = conn;
1075 ctask->sc = sc;
1076 INIT_LIST_HEAD(&ctask->running);
1077
1078 list_add_tail(&ctask->running, &conn->xmitqueue);
1079 spin_unlock(&session->lock);
1080
1081 scsi_queue_work(host, &conn->xmitwork);
1082 spin_lock(host->host_lock);
1083 return 0;
1084
1085 reject:
1086 spin_unlock(&session->lock);
1087 debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason);
1088 spin_lock(host->host_lock);
1089 return SCSI_MLQUEUE_HOST_BUSY;
1090
1091 fault:
1092 spin_unlock(&session->lock);
1093 printk(KERN_ERR "iscsi: cmd 0x%x is not queued (%d)\n",
1094 sc->cmnd[0], reason);
1095 sc->result = (DID_NO_CONNECT << 16);
1096 scsi_set_resid(sc, scsi_bufflen(sc));
1097 sc->scsi_done(sc);
1098 spin_lock(host->host_lock);
1099 return 0;
1100 }
1101 EXPORT_SYMBOL_GPL(iscsi_queuecommand);
1102
1103 int iscsi_change_queue_depth(struct scsi_device *sdev, int depth)
1104 {
1105 if (depth > ISCSI_MAX_CMD_PER_LUN)
1106 depth = ISCSI_MAX_CMD_PER_LUN;
1107 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
1108 return sdev->queue_depth;
1109 }
1110 EXPORT_SYMBOL_GPL(iscsi_change_queue_depth);
1111
1112 void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
1113 {
1114 struct iscsi_session *session = class_to_transport_session(cls_session);
1115
1116 spin_lock_bh(&session->lock);
1117 if (session->state != ISCSI_STATE_LOGGED_IN) {
1118 session->state = ISCSI_STATE_RECOVERY_FAILED;
1119 if (session->leadconn)
1120 wake_up(&session->leadconn->ehwait);
1121 }
1122 spin_unlock_bh(&session->lock);
1123 }
1124 EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
1125
1126 int iscsi_eh_host_reset(struct scsi_cmnd *sc)
1127 {
1128 struct Scsi_Host *host = sc->device->host;
1129 struct iscsi_session *session = iscsi_hostdata(host->hostdata);
1130 struct iscsi_conn *conn = session->leadconn;
1131
1132 mutex_lock(&session->eh_mutex);
1133 spin_lock_bh(&session->lock);
1134 if (session->state == ISCSI_STATE_TERMINATE) {
1135 failed:
1136 debug_scsi("failing host reset: session terminated "
1137 "[CID %d age %d]\n", conn->id, session->age);
1138 spin_unlock_bh(&session->lock);
1139 mutex_unlock(&session->eh_mutex);
1140 return FAILED;
1141 }
1142
1143 spin_unlock_bh(&session->lock);
1144 mutex_unlock(&session->eh_mutex);
1145 /*
1146 * we drop the lock here but the leadconn cannot be destoyed while
1147 * we are in the scsi eh
1148 */
1149 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1150
1151 debug_scsi("iscsi_eh_host_reset wait for relogin\n");
1152 wait_event_interruptible(conn->ehwait,
1153 session->state == ISCSI_STATE_TERMINATE ||
1154 session->state == ISCSI_STATE_LOGGED_IN ||
1155 session->state == ISCSI_STATE_RECOVERY_FAILED);
1156 if (signal_pending(current))
1157 flush_signals(current);
1158
1159 mutex_lock(&session->eh_mutex);
1160 spin_lock_bh(&session->lock);
1161 if (session->state == ISCSI_STATE_LOGGED_IN)
1162 printk(KERN_INFO "iscsi: host reset succeeded\n");
1163 else
1164 goto failed;
1165 spin_unlock_bh(&session->lock);
1166 mutex_unlock(&session->eh_mutex);
1167 return SUCCESS;
1168 }
1169 EXPORT_SYMBOL_GPL(iscsi_eh_host_reset);
1170
1171 static void iscsi_tmf_timedout(unsigned long data)
1172 {
1173 struct iscsi_conn *conn = (struct iscsi_conn *)data;
1174 struct iscsi_session *session = conn->session;
1175
1176 spin_lock(&session->lock);
1177 if (conn->tmf_state == TMF_QUEUED) {
1178 conn->tmf_state = TMF_TIMEDOUT;
1179 debug_scsi("tmf timedout\n");
1180 /* unblock eh_abort() */
1181 wake_up(&conn->ehwait);
1182 }
1183 spin_unlock(&session->lock);
1184 }
1185
1186 static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn,
1187 struct iscsi_tm *hdr, int age,
1188 int timeout)
1189 {
1190 struct iscsi_session *session = conn->session;
1191 struct iscsi_mgmt_task *mtask;
1192
1193 mtask = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr,
1194 NULL, 0);
1195 if (!mtask) {
1196 spin_unlock_bh(&session->lock);
1197 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1198 spin_lock_bh(&session->lock);
1199 debug_scsi("tmf exec failure\n");
1200 return -EPERM;
1201 }
1202 conn->tmfcmd_pdus_cnt++;
1203 conn->tmf_timer.expires = timeout * HZ + jiffies;
1204 conn->tmf_timer.function = iscsi_tmf_timedout;
1205 conn->tmf_timer.data = (unsigned long)conn;
1206 add_timer(&conn->tmf_timer);
1207 debug_scsi("tmf set timeout\n");
1208
1209 spin_unlock_bh(&session->lock);
1210 mutex_unlock(&session->eh_mutex);
1211 scsi_queue_work(session->host, &conn->xmitwork);
1212
1213 /*
1214 * block eh thread until:
1215 *
1216 * 1) tmf response
1217 * 2) tmf timeout
1218 * 3) session is terminated or restarted or userspace has
1219 * given up on recovery
1220 */
1221 wait_event_interruptible(conn->ehwait, age != session->age ||
1222 session->state != ISCSI_STATE_LOGGED_IN ||
1223 conn->tmf_state != TMF_QUEUED);
1224 if (signal_pending(current))
1225 flush_signals(current);
1226 del_timer_sync(&conn->tmf_timer);
1227
1228 mutex_lock(&session->eh_mutex);
1229 spin_lock_bh(&session->lock);
1230 /* if the session drops it will clean up the mtask */
1231 if (age != session->age ||
1232 session->state != ISCSI_STATE_LOGGED_IN)
1233 return -ENOTCONN;
1234 return 0;
1235 }
1236
1237 /*
1238 * Fail commands. session lock held and recv side suspended and xmit
1239 * thread flushed
1240 */
1241 static void fail_all_commands(struct iscsi_conn *conn, unsigned lun)
1242 {
1243 struct iscsi_cmd_task *ctask, *tmp;
1244
1245 if (conn->ctask && (conn->ctask->sc->device->lun == lun || lun == -1))
1246 conn->ctask = NULL;
1247
1248 /* flush pending */
1249 list_for_each_entry_safe(ctask, tmp, &conn->xmitqueue, running) {
1250 if (lun == ctask->sc->device->lun || lun == -1) {
1251 debug_scsi("failing pending sc %p itt 0x%x\n",
1252 ctask->sc, ctask->itt);
1253 fail_command(conn, ctask, DID_BUS_BUSY << 16);
1254 }
1255 }
1256
1257 list_for_each_entry_safe(ctask, tmp, &conn->requeue, running) {
1258 if (lun == ctask->sc->device->lun || lun == -1) {
1259 debug_scsi("failing requeued sc %p itt 0x%x\n",
1260 ctask->sc, ctask->itt);
1261 fail_command(conn, ctask, DID_BUS_BUSY << 16);
1262 }
1263 }
1264
1265 /* fail all other running */
1266 list_for_each_entry_safe(ctask, tmp, &conn->run_list, running) {
1267 if (lun == ctask->sc->device->lun || lun == -1) {
1268 debug_scsi("failing in progress sc %p itt 0x%x\n",
1269 ctask->sc, ctask->itt);
1270 fail_command(conn, ctask, DID_BUS_BUSY << 16);
1271 }
1272 }
1273 }
1274
1275 static void iscsi_suspend_tx(struct iscsi_conn *conn)
1276 {
1277 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1278 scsi_flush_work(conn->session->host);
1279 }
1280
1281 static void iscsi_start_tx(struct iscsi_conn *conn)
1282 {
1283 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1284 scsi_queue_work(conn->session->host, &conn->xmitwork);
1285 }
1286
1287 static enum scsi_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *scmd)
1288 {
1289 struct iscsi_cls_session *cls_session;
1290 struct iscsi_session *session;
1291 struct iscsi_conn *conn;
1292 enum scsi_eh_timer_return rc = EH_NOT_HANDLED;
1293
1294 cls_session = starget_to_session(scsi_target(scmd->device));
1295 session = class_to_transport_session(cls_session);
1296
1297 debug_scsi("scsi cmd %p timedout\n", scmd);
1298
1299 spin_lock(&session->lock);
1300 if (session->state != ISCSI_STATE_LOGGED_IN) {
1301 /*
1302 * We are probably in the middle of iscsi recovery so let
1303 * that complete and handle the error.
1304 */
1305 rc = EH_RESET_TIMER;
1306 goto done;
1307 }
1308
1309 conn = session->leadconn;
1310 if (!conn) {
1311 /* In the middle of shuting down */
1312 rc = EH_RESET_TIMER;
1313 goto done;
1314 }
1315
1316 if (!conn->recv_timeout && !conn->ping_timeout)
1317 goto done;
1318 /*
1319 * if the ping timedout then we are in the middle of cleaning up
1320 * and can let the iscsi eh handle it
1321 */
1322 if (time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) +
1323 (conn->ping_timeout * HZ), jiffies))
1324 rc = EH_RESET_TIMER;
1325 /*
1326 * if we are about to check the transport then give the command
1327 * more time
1328 */
1329 if (time_before_eq(conn->last_recv + (conn->recv_timeout * HZ),
1330 jiffies))
1331 rc = EH_RESET_TIMER;
1332 /* if in the middle of checking the transport then give us more time */
1333 if (conn->ping_mtask)
1334 rc = EH_RESET_TIMER;
1335 done:
1336 spin_unlock(&session->lock);
1337 debug_scsi("return %s\n", rc == EH_RESET_TIMER ? "timer reset" : "nh");
1338 return rc;
1339 }
1340
1341 static void iscsi_check_transport_timeouts(unsigned long data)
1342 {
1343 struct iscsi_conn *conn = (struct iscsi_conn *)data;
1344 struct iscsi_session *session = conn->session;
1345 unsigned long timeout, next_timeout = 0, last_recv;
1346
1347 spin_lock(&session->lock);
1348 if (session->state != ISCSI_STATE_LOGGED_IN)
1349 goto done;
1350
1351 timeout = conn->recv_timeout;
1352 if (!timeout)
1353 goto done;
1354
1355 timeout *= HZ;
1356 last_recv = conn->last_recv;
1357 if (time_before_eq(last_recv + timeout + (conn->ping_timeout * HZ),
1358 jiffies)) {
1359 printk(KERN_ERR "ping timeout of %d secs expired, "
1360 "last rx %lu, last ping %lu, now %lu\n",
1361 conn->ping_timeout, last_recv,
1362 conn->last_ping, jiffies);
1363 spin_unlock(&session->lock);
1364 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1365 return;
1366 }
1367
1368 if (time_before_eq(last_recv + timeout, jiffies)) {
1369 if (time_before_eq(conn->last_ping, last_recv)) {
1370 /* send a ping to try to provoke some traffic */
1371 debug_scsi("Sending nopout as ping on conn %p\n", conn);
1372 iscsi_send_nopout(conn, NULL);
1373 }
1374 next_timeout = last_recv + timeout + (conn->ping_timeout * HZ);
1375 } else {
1376 next_timeout = last_recv + timeout;
1377 }
1378
1379 if (next_timeout) {
1380 debug_scsi("Setting next tmo %lu\n", next_timeout);
1381 mod_timer(&conn->transport_timer, next_timeout);
1382 }
1383 done:
1384 spin_unlock(&session->lock);
1385 }
1386
1387 static void iscsi_prep_abort_task_pdu(struct iscsi_cmd_task *ctask,
1388 struct iscsi_tm *hdr)
1389 {
1390 memset(hdr, 0, sizeof(*hdr));
1391 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
1392 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK;
1393 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
1394 memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
1395 hdr->rtt = ctask->hdr->itt;
1396 hdr->refcmdsn = ctask->hdr->cmdsn;
1397 }
1398
1399 int iscsi_eh_abort(struct scsi_cmnd *sc)
1400 {
1401 struct Scsi_Host *host = sc->device->host;
1402 struct iscsi_session *session = iscsi_hostdata(host->hostdata);
1403 struct iscsi_conn *conn;
1404 struct iscsi_cmd_task *ctask;
1405 struct iscsi_tm *hdr;
1406 int rc, age;
1407
1408 mutex_lock(&session->eh_mutex);
1409 spin_lock_bh(&session->lock);
1410 /*
1411 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
1412 * got the command.
1413 */
1414 if (!sc->SCp.ptr) {
1415 debug_scsi("sc never reached iscsi layer or it completed.\n");
1416 spin_unlock_bh(&session->lock);
1417 mutex_unlock(&session->eh_mutex);
1418 return SUCCESS;
1419 }
1420
1421 /*
1422 * If we are not logged in or we have started a new session
1423 * then let the host reset code handle this
1424 */
1425 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN ||
1426 sc->SCp.phase != session->age) {
1427 spin_unlock_bh(&session->lock);
1428 mutex_unlock(&session->eh_mutex);
1429 return FAILED;
1430 }
1431
1432 conn = session->leadconn;
1433 conn->eh_abort_cnt++;
1434 age = session->age;
1435
1436 ctask = (struct iscsi_cmd_task *)sc->SCp.ptr;
1437 debug_scsi("aborting [sc %p itt 0x%x]\n", sc, ctask->itt);
1438
1439 /* ctask completed before time out */
1440 if (!ctask->sc) {
1441 debug_scsi("sc completed while abort in progress\n");
1442 goto success;
1443 }
1444
1445 if (ctask->state == ISCSI_TASK_PENDING) {
1446 fail_command(conn, ctask, DID_ABORT << 16);
1447 goto success;
1448 }
1449
1450 /* only have one tmf outstanding at a time */
1451 if (conn->tmf_state != TMF_INITIAL)
1452 goto failed;
1453 conn->tmf_state = TMF_QUEUED;
1454
1455 hdr = &conn->tmhdr;
1456 iscsi_prep_abort_task_pdu(ctask, hdr);
1457
1458 if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout)) {
1459 rc = FAILED;
1460 goto failed;
1461 }
1462
1463 switch (conn->tmf_state) {
1464 case TMF_SUCCESS:
1465 spin_unlock_bh(&session->lock);
1466 iscsi_suspend_tx(conn);
1467 /*
1468 * clean up task if aborted. grab the recv lock as a writer
1469 */
1470 write_lock_bh(conn->recv_lock);
1471 spin_lock(&session->lock);
1472 fail_command(conn, ctask, DID_ABORT << 16);
1473 conn->tmf_state = TMF_INITIAL;
1474 spin_unlock(&session->lock);
1475 write_unlock_bh(conn->recv_lock);
1476 iscsi_start_tx(conn);
1477 goto success_unlocked;
1478 case TMF_TIMEDOUT:
1479 spin_unlock_bh(&session->lock);
1480 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1481 goto failed_unlocked;
1482 case TMF_NOT_FOUND:
1483 if (!sc->SCp.ptr) {
1484 conn->tmf_state = TMF_INITIAL;
1485 /* ctask completed before tmf abort response */
1486 debug_scsi("sc completed while abort in progress\n");
1487 goto success;
1488 }
1489 /* fall through */
1490 default:
1491 conn->tmf_state = TMF_INITIAL;
1492 goto failed;
1493 }
1494
1495 success:
1496 spin_unlock_bh(&session->lock);
1497 success_unlocked:
1498 debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
1499 mutex_unlock(&session->eh_mutex);
1500 return SUCCESS;
1501
1502 failed:
1503 spin_unlock_bh(&session->lock);
1504 failed_unlocked:
1505 debug_scsi("abort failed [sc %p itt 0x%x]\n", sc,
1506 ctask ? ctask->itt : 0);
1507 mutex_unlock(&session->eh_mutex);
1508 return FAILED;
1509 }
1510 EXPORT_SYMBOL_GPL(iscsi_eh_abort);
1511
1512 static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
1513 {
1514 memset(hdr, 0, sizeof(*hdr));
1515 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
1516 hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK;
1517 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
1518 int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun);
1519 hdr->rtt = RESERVED_ITT;
1520 }
1521
1522 int iscsi_eh_device_reset(struct scsi_cmnd *sc)
1523 {
1524 struct Scsi_Host *host = sc->device->host;
1525 struct iscsi_session *session = iscsi_hostdata(host->hostdata);
1526 struct iscsi_conn *conn;
1527 struct iscsi_tm *hdr;
1528 int rc = FAILED;
1529
1530 debug_scsi("LU Reset [sc %p lun %u]\n", sc, sc->device->lun);
1531
1532 mutex_lock(&session->eh_mutex);
1533 spin_lock_bh(&session->lock);
1534 /*
1535 * Just check if we are not logged in. We cannot check for
1536 * the phase because the reset could come from a ioctl.
1537 */
1538 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
1539 goto unlock;
1540 conn = session->leadconn;
1541
1542 /* only have one tmf outstanding at a time */
1543 if (conn->tmf_state != TMF_INITIAL)
1544 goto unlock;
1545 conn->tmf_state = TMF_QUEUED;
1546
1547 hdr = &conn->tmhdr;
1548 iscsi_prep_lun_reset_pdu(sc, hdr);
1549
1550 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
1551 session->lu_reset_timeout)) {
1552 rc = FAILED;
1553 goto unlock;
1554 }
1555
1556 switch (conn->tmf_state) {
1557 case TMF_SUCCESS:
1558 break;
1559 case TMF_TIMEDOUT:
1560 spin_unlock_bh(&session->lock);
1561 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1562 goto done;
1563 default:
1564 conn->tmf_state = TMF_INITIAL;
1565 goto unlock;
1566 }
1567
1568 rc = SUCCESS;
1569 spin_unlock_bh(&session->lock);
1570
1571 iscsi_suspend_tx(conn);
1572 /* need to grab the recv lock then session lock */
1573 write_lock_bh(conn->recv_lock);
1574 spin_lock(&session->lock);
1575 fail_all_commands(conn, sc->device->lun);
1576 conn->tmf_state = TMF_INITIAL;
1577 spin_unlock(&session->lock);
1578 write_unlock_bh(conn->recv_lock);
1579
1580 iscsi_start_tx(conn);
1581 goto done;
1582
1583 unlock:
1584 spin_unlock_bh(&session->lock);
1585 done:
1586 debug_scsi("iscsi_eh_device_reset %s\n",
1587 rc == SUCCESS ? "SUCCESS" : "FAILED");
1588 mutex_unlock(&session->eh_mutex);
1589 return rc;
1590 }
1591 EXPORT_SYMBOL_GPL(iscsi_eh_device_reset);
1592
1593 /*
1594 * Pre-allocate a pool of @max items of @item_size. By default, the pool
1595 * should be accessed via kfifo_{get,put} on q->queue.
1596 * Optionally, the caller can obtain the array of object pointers
1597 * by passing in a non-NULL @items pointer
1598 */
1599 int
1600 iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size)
1601 {
1602 int i, num_arrays = 1;
1603
1604 memset(q, 0, sizeof(*q));
1605
1606 q->max = max;
1607
1608 /* If the user passed an items pointer, he wants a copy of
1609 * the array. */
1610 if (items)
1611 num_arrays++;
1612 q->pool = kzalloc(num_arrays * max * sizeof(void*), GFP_KERNEL);
1613 if (q->pool == NULL)
1614 goto enomem;
1615
1616 q->queue = kfifo_init((void*)q->pool, max * sizeof(void*),
1617 GFP_KERNEL, NULL);
1618 if (q->queue == ERR_PTR(-ENOMEM))
1619 goto enomem;
1620
1621 for (i = 0; i < max; i++) {
1622 q->pool[i] = kzalloc(item_size, GFP_KERNEL);
1623 if (q->pool[i] == NULL) {
1624 q->max = i;
1625 goto enomem;
1626 }
1627 __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*));
1628 }
1629
1630 if (items) {
1631 *items = q->pool + max;
1632 memcpy(*items, q->pool, max * sizeof(void *));
1633 }
1634
1635 return 0;
1636
1637 enomem:
1638 iscsi_pool_free(q);
1639 return -ENOMEM;
1640 }
1641 EXPORT_SYMBOL_GPL(iscsi_pool_init);
1642
1643 void iscsi_pool_free(struct iscsi_pool *q)
1644 {
1645 int i;
1646
1647 for (i = 0; i < q->max; i++)
1648 kfree(q->pool[i]);
1649 if (q->pool)
1650 kfree(q->pool);
1651 }
1652 EXPORT_SYMBOL_GPL(iscsi_pool_free);
1653
1654 /*
1655 * iSCSI Session's hostdata organization:
1656 *
1657 * *------------------* <== hostdata_session(host->hostdata)
1658 * | ptr to class sess|
1659 * |------------------| <== iscsi_hostdata(host->hostdata)
1660 * | iscsi_session |
1661 * *------------------*
1662 */
1663
1664 #define hostdata_privsize(_sz) (sizeof(unsigned long) + _sz + \
1665 _sz % sizeof(unsigned long))
1666
1667 #define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata))
1668
1669 /**
1670 * iscsi_session_setup - create iscsi cls session and host and session
1671 * @scsit: scsi transport template
1672 * @iscsit: iscsi transport template
1673 * @cmds_max: scsi host can queue
1674 * @qdepth: scsi host cmds per lun
1675 * @cmd_task_size: LLD ctask private data size
1676 * @mgmt_task_size: LLD mtask private data size
1677 * @initial_cmdsn: initial CmdSN
1678 * @hostno: host no allocated
1679 *
1680 * This can be used by software iscsi_transports that allocate
1681 * a session per scsi host.
1682 **/
1683 struct iscsi_cls_session *
1684 iscsi_session_setup(struct iscsi_transport *iscsit,
1685 struct scsi_transport_template *scsit,
1686 uint16_t cmds_max, uint16_t qdepth,
1687 int cmd_task_size, int mgmt_task_size,
1688 uint32_t initial_cmdsn, uint32_t *hostno)
1689 {
1690 struct Scsi_Host *shost;
1691 struct iscsi_session *session;
1692 struct iscsi_cls_session *cls_session;
1693 int cmd_i;
1694
1695 if (qdepth > ISCSI_MAX_CMD_PER_LUN || qdepth < 1) {
1696 if (qdepth != 0)
1697 printk(KERN_ERR "iscsi: invalid queue depth of %d. "
1698 "Queue depth must be between 1 and %d.\n",
1699 qdepth, ISCSI_MAX_CMD_PER_LUN);
1700 qdepth = ISCSI_DEF_CMD_PER_LUN;
1701 }
1702
1703 if (!is_power_of_2(cmds_max) ||
1704 cmds_max >= ISCSI_MGMT_ITT_OFFSET) {
1705 if (cmds_max != 0)
1706 printk(KERN_ERR "iscsi: invalid can_queue of %d. "
1707 "can_queue must be a power of 2 and between "
1708 "2 and %d - setting to %d.\n", cmds_max,
1709 ISCSI_MGMT_ITT_OFFSET, ISCSI_DEF_XMIT_CMDS_MAX);
1710 cmds_max = ISCSI_DEF_XMIT_CMDS_MAX;
1711 }
1712
1713 shost = scsi_host_alloc(iscsit->host_template,
1714 hostdata_privsize(sizeof(*session)));
1715 if (!shost)
1716 return NULL;
1717
1718 /* the iscsi layer takes one task for reserve */
1719 shost->can_queue = cmds_max - 1;
1720 shost->cmd_per_lun = qdepth;
1721 shost->max_id = 1;
1722 shost->max_channel = 0;
1723 shost->max_lun = iscsit->max_lun;
1724 shost->max_cmd_len = iscsit->max_cmd_len;
1725 shost->transportt = scsit;
1726 shost->transportt->create_work_queue = 1;
1727 shost->transportt->eh_timed_out = iscsi_eh_cmd_timed_out;
1728 *hostno = shost->host_no;
1729
1730 session = iscsi_hostdata(shost->hostdata);
1731 memset(session, 0, sizeof(struct iscsi_session));
1732 session->host = shost;
1733 session->state = ISCSI_STATE_FREE;
1734 session->fast_abort = 1;
1735 session->lu_reset_timeout = 15;
1736 session->abort_timeout = 10;
1737 session->mgmtpool_max = ISCSI_MGMT_CMDS_MAX;
1738 session->cmds_max = cmds_max;
1739 session->queued_cmdsn = session->cmdsn = initial_cmdsn;
1740 session->exp_cmdsn = initial_cmdsn + 1;
1741 session->max_cmdsn = initial_cmdsn + 1;
1742 session->max_r2t = 1;
1743 session->tt = iscsit;
1744 mutex_init(&session->eh_mutex);
1745
1746 /* initialize SCSI PDU commands pool */
1747 if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
1748 (void***)&session->cmds,
1749 cmd_task_size + sizeof(struct iscsi_cmd_task)))
1750 goto cmdpool_alloc_fail;
1751
1752 /* pre-format cmds pool with ITT */
1753 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
1754 struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
1755
1756 if (cmd_task_size)
1757 ctask->dd_data = &ctask[1];
1758 ctask->itt = cmd_i;
1759 INIT_LIST_HEAD(&ctask->running);
1760 }
1761
1762 spin_lock_init(&session->lock);
1763
1764 /* initialize immediate command pool */
1765 if (iscsi_pool_init(&session->mgmtpool, session->mgmtpool_max,
1766 (void***)&session->mgmt_cmds,
1767 mgmt_task_size + sizeof(struct iscsi_mgmt_task)))
1768 goto mgmtpool_alloc_fail;
1769
1770
1771 /* pre-format immediate cmds pool with ITT */
1772 for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) {
1773 struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i];
1774
1775 if (mgmt_task_size)
1776 mtask->dd_data = &mtask[1];
1777 mtask->itt = ISCSI_MGMT_ITT_OFFSET + cmd_i;
1778 INIT_LIST_HEAD(&mtask->running);
1779 }
1780
1781 if (scsi_add_host(shost, NULL))
1782 goto add_host_fail;
1783
1784 if (!try_module_get(iscsit->owner))
1785 goto cls_session_fail;
1786
1787 cls_session = iscsi_create_session(shost, iscsit, 0);
1788 if (!cls_session)
1789 goto module_put;
1790 *(unsigned long*)shost->hostdata = (unsigned long)cls_session;
1791
1792 return cls_session;
1793
1794 module_put:
1795 module_put(iscsit->owner);
1796 cls_session_fail:
1797 scsi_remove_host(shost);
1798 add_host_fail:
1799 iscsi_pool_free(&session->mgmtpool);
1800 mgmtpool_alloc_fail:
1801 iscsi_pool_free(&session->cmdpool);
1802 cmdpool_alloc_fail:
1803 scsi_host_put(shost);
1804 return NULL;
1805 }
1806 EXPORT_SYMBOL_GPL(iscsi_session_setup);
1807
1808 /**
1809 * iscsi_session_teardown - destroy session, host, and cls_session
1810 * shost: scsi host
1811 *
1812 * This can be used by software iscsi_transports that allocate
1813 * a session per scsi host.
1814 **/
1815 void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
1816 {
1817 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
1818 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
1819 struct module *owner = cls_session->transport->owner;
1820
1821 iscsi_remove_session(cls_session);
1822 scsi_remove_host(shost);
1823
1824 iscsi_pool_free(&session->mgmtpool);
1825 iscsi_pool_free(&session->cmdpool);
1826
1827 kfree(session->password);
1828 kfree(session->password_in);
1829 kfree(session->username);
1830 kfree(session->username_in);
1831 kfree(session->targetname);
1832 kfree(session->netdev);
1833 kfree(session->hwaddress);
1834 kfree(session->initiatorname);
1835
1836 iscsi_free_session(cls_session);
1837 scsi_host_put(shost);
1838 module_put(owner);
1839 }
1840 EXPORT_SYMBOL_GPL(iscsi_session_teardown);
1841
1842 /**
1843 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
1844 * @cls_session: iscsi_cls_session
1845 * @conn_idx: cid
1846 **/
1847 struct iscsi_cls_conn *
1848 iscsi_conn_setup(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
1849 {
1850 struct iscsi_session *session = class_to_transport_session(cls_session);
1851 struct iscsi_conn *conn;
1852 struct iscsi_cls_conn *cls_conn;
1853 char *data;
1854
1855 cls_conn = iscsi_create_conn(cls_session, conn_idx);
1856 if (!cls_conn)
1857 return NULL;
1858 conn = cls_conn->dd_data;
1859 memset(conn, 0, sizeof(*conn));
1860
1861 conn->session = session;
1862 conn->cls_conn = cls_conn;
1863 conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
1864 conn->id = conn_idx;
1865 conn->exp_statsn = 0;
1866 conn->tmf_state = TMF_INITIAL;
1867
1868 init_timer(&conn->transport_timer);
1869 conn->transport_timer.data = (unsigned long)conn;
1870 conn->transport_timer.function = iscsi_check_transport_timeouts;
1871
1872 INIT_LIST_HEAD(&conn->run_list);
1873 INIT_LIST_HEAD(&conn->mgmt_run_list);
1874 INIT_LIST_HEAD(&conn->mgmtqueue);
1875 INIT_LIST_HEAD(&conn->xmitqueue);
1876 INIT_LIST_HEAD(&conn->requeue);
1877 INIT_WORK(&conn->xmitwork, iscsi_xmitworker);
1878
1879 /* allocate login_mtask used for the login/text sequences */
1880 spin_lock_bh(&session->lock);
1881 if (!__kfifo_get(session->mgmtpool.queue,
1882 (void*)&conn->login_mtask,
1883 sizeof(void*))) {
1884 spin_unlock_bh(&session->lock);
1885 goto login_mtask_alloc_fail;
1886 }
1887 spin_unlock_bh(&session->lock);
1888
1889 data = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN, GFP_KERNEL);
1890 if (!data)
1891 goto login_mtask_data_alloc_fail;
1892 conn->login_mtask->data = conn->data = data;
1893
1894 init_timer(&conn->tmf_timer);
1895 init_waitqueue_head(&conn->ehwait);
1896
1897 return cls_conn;
1898
1899 login_mtask_data_alloc_fail:
1900 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
1901 sizeof(void*));
1902 login_mtask_alloc_fail:
1903 iscsi_destroy_conn(cls_conn);
1904 return NULL;
1905 }
1906 EXPORT_SYMBOL_GPL(iscsi_conn_setup);
1907
1908 /**
1909 * iscsi_conn_teardown - teardown iscsi connection
1910 * cls_conn: iscsi class connection
1911 *
1912 * TODO: we may need to make this into a two step process
1913 * like scsi-mls remove + put host
1914 */
1915 void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
1916 {
1917 struct iscsi_conn *conn = cls_conn->dd_data;
1918 struct iscsi_session *session = conn->session;
1919 unsigned long flags;
1920
1921 del_timer_sync(&conn->transport_timer);
1922
1923 spin_lock_bh(&session->lock);
1924 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
1925 if (session->leadconn == conn) {
1926 /*
1927 * leading connection? then give up on recovery.
1928 */
1929 session->state = ISCSI_STATE_TERMINATE;
1930 wake_up(&conn->ehwait);
1931 }
1932 spin_unlock_bh(&session->lock);
1933
1934 /*
1935 * Block until all in-progress commands for this connection
1936 * time out or fail.
1937 */
1938 for (;;) {
1939 spin_lock_irqsave(session->host->host_lock, flags);
1940 if (!session->host->host_busy) { /* OK for ERL == 0 */
1941 spin_unlock_irqrestore(session->host->host_lock, flags);
1942 break;
1943 }
1944 spin_unlock_irqrestore(session->host->host_lock, flags);
1945 msleep_interruptible(500);
1946 printk(KERN_INFO "iscsi: scsi conn_destroy(): host_busy %d "
1947 "host_failed %d\n", session->host->host_busy,
1948 session->host->host_failed);
1949 /*
1950 * force eh_abort() to unblock
1951 */
1952 wake_up(&conn->ehwait);
1953 }
1954
1955 /* flush queued up work because we free the connection below */
1956 iscsi_suspend_tx(conn);
1957
1958 spin_lock_bh(&session->lock);
1959 kfree(conn->data);
1960 kfree(conn->persistent_address);
1961 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
1962 sizeof(void*));
1963 if (session->leadconn == conn)
1964 session->leadconn = NULL;
1965 spin_unlock_bh(&session->lock);
1966
1967 iscsi_destroy_conn(cls_conn);
1968 }
1969 EXPORT_SYMBOL_GPL(iscsi_conn_teardown);
1970
1971 int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
1972 {
1973 struct iscsi_conn *conn = cls_conn->dd_data;
1974 struct iscsi_session *session = conn->session;
1975
1976 if (!session) {
1977 printk(KERN_ERR "iscsi: can't start unbound connection\n");
1978 return -EPERM;
1979 }
1980
1981 if ((session->imm_data_en || !session->initial_r2t_en) &&
1982 session->first_burst > session->max_burst) {
1983 printk("iscsi: invalid burst lengths: "
1984 "first_burst %d max_burst %d\n",
1985 session->first_burst, session->max_burst);
1986 return -EINVAL;
1987 }
1988
1989 if (conn->ping_timeout && !conn->recv_timeout) {
1990 printk(KERN_ERR "iscsi: invalid recv timeout of zero "
1991 "Using 5 seconds\n.");
1992 conn->recv_timeout = 5;
1993 }
1994
1995 if (conn->recv_timeout && !conn->ping_timeout) {
1996 printk(KERN_ERR "iscsi: invalid ping timeout of zero "
1997 "Using 5 seconds.\n");
1998 conn->ping_timeout = 5;
1999 }
2000
2001 spin_lock_bh(&session->lock);
2002 conn->c_stage = ISCSI_CONN_STARTED;
2003 session->state = ISCSI_STATE_LOGGED_IN;
2004 session->queued_cmdsn = session->cmdsn;
2005
2006 conn->last_recv = jiffies;
2007 conn->last_ping = jiffies;
2008 if (conn->recv_timeout && conn->ping_timeout)
2009 mod_timer(&conn->transport_timer,
2010 jiffies + (conn->recv_timeout * HZ));
2011
2012 switch(conn->stop_stage) {
2013 case STOP_CONN_RECOVER:
2014 /*
2015 * unblock eh_abort() if it is blocked. re-try all
2016 * commands after successful recovery
2017 */
2018 conn->stop_stage = 0;
2019 conn->tmf_state = TMF_INITIAL;
2020 session->age++;
2021 spin_unlock_bh(&session->lock);
2022
2023 iscsi_unblock_session(session_to_cls(session));
2024 wake_up(&conn->ehwait);
2025 return 0;
2026 case STOP_CONN_TERM:
2027 conn->stop_stage = 0;
2028 break;
2029 default:
2030 break;
2031 }
2032 spin_unlock_bh(&session->lock);
2033
2034 return 0;
2035 }
2036 EXPORT_SYMBOL_GPL(iscsi_conn_start);
2037
2038 static void
2039 flush_control_queues(struct iscsi_session *session, struct iscsi_conn *conn)
2040 {
2041 struct iscsi_mgmt_task *mtask, *tmp;
2042
2043 /* handle pending */
2044 list_for_each_entry_safe(mtask, tmp, &conn->mgmtqueue, running) {
2045 debug_scsi("flushing pending mgmt task itt 0x%x\n", mtask->itt);
2046 iscsi_free_mgmt_task(conn, mtask);
2047 }
2048
2049 /* handle running */
2050 list_for_each_entry_safe(mtask, tmp, &conn->mgmt_run_list, running) {
2051 debug_scsi("flushing running mgmt task itt 0x%x\n", mtask->itt);
2052 iscsi_free_mgmt_task(conn, mtask);
2053 }
2054
2055 conn->mtask = NULL;
2056 }
2057
2058 static void iscsi_start_session_recovery(struct iscsi_session *session,
2059 struct iscsi_conn *conn, int flag)
2060 {
2061 int old_stop_stage;
2062
2063 del_timer_sync(&conn->transport_timer);
2064
2065 mutex_lock(&session->eh_mutex);
2066 spin_lock_bh(&session->lock);
2067 if (conn->stop_stage == STOP_CONN_TERM) {
2068 spin_unlock_bh(&session->lock);
2069 mutex_unlock(&session->eh_mutex);
2070 return;
2071 }
2072
2073 /*
2074 * The LLD either freed/unset the lock on us, or userspace called
2075 * stop but did not create a proper connection (connection was never
2076 * bound or it was unbound then stop was called).
2077 */
2078 if (!conn->recv_lock) {
2079 spin_unlock_bh(&session->lock);
2080 mutex_unlock(&session->eh_mutex);
2081 return;
2082 }
2083
2084 /*
2085 * When this is called for the in_login state, we only want to clean
2086 * up the login task and connection. We do not need to block and set
2087 * the recovery state again
2088 */
2089 if (flag == STOP_CONN_TERM)
2090 session->state = ISCSI_STATE_TERMINATE;
2091 else if (conn->stop_stage != STOP_CONN_RECOVER)
2092 session->state = ISCSI_STATE_IN_RECOVERY;
2093
2094 old_stop_stage = conn->stop_stage;
2095 conn->stop_stage = flag;
2096 conn->c_stage = ISCSI_CONN_STOPPED;
2097 spin_unlock_bh(&session->lock);
2098
2099 iscsi_suspend_tx(conn);
2100
2101 write_lock_bh(conn->recv_lock);
2102 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
2103 write_unlock_bh(conn->recv_lock);
2104
2105 /*
2106 * for connection level recovery we should not calculate
2107 * header digest. conn->hdr_size used for optimization
2108 * in hdr_extract() and will be re-negotiated at
2109 * set_param() time.
2110 */
2111 if (flag == STOP_CONN_RECOVER) {
2112 conn->hdrdgst_en = 0;
2113 conn->datadgst_en = 0;
2114 if (session->state == ISCSI_STATE_IN_RECOVERY &&
2115 old_stop_stage != STOP_CONN_RECOVER) {
2116 debug_scsi("blocking session\n");
2117 iscsi_block_session(session_to_cls(session));
2118 }
2119 }
2120
2121 /*
2122 * flush queues.
2123 */
2124 spin_lock_bh(&session->lock);
2125 fail_all_commands(conn, -1);
2126 flush_control_queues(session, conn);
2127 spin_unlock_bh(&session->lock);
2128 mutex_unlock(&session->eh_mutex);
2129 }
2130
2131 void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
2132 {
2133 struct iscsi_conn *conn = cls_conn->dd_data;
2134 struct iscsi_session *session = conn->session;
2135
2136 switch (flag) {
2137 case STOP_CONN_RECOVER:
2138 case STOP_CONN_TERM:
2139 iscsi_start_session_recovery(session, conn, flag);
2140 break;
2141 default:
2142 printk(KERN_ERR "iscsi: invalid stop flag %d\n", flag);
2143 }
2144 }
2145 EXPORT_SYMBOL_GPL(iscsi_conn_stop);
2146
2147 int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
2148 struct iscsi_cls_conn *cls_conn, int is_leading)
2149 {
2150 struct iscsi_session *session = class_to_transport_session(cls_session);
2151 struct iscsi_conn *conn = cls_conn->dd_data;
2152
2153 spin_lock_bh(&session->lock);
2154 if (is_leading)
2155 session->leadconn = conn;
2156 spin_unlock_bh(&session->lock);
2157
2158 /*
2159 * Unblock xmitworker(), Login Phase will pass through.
2160 */
2161 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
2162 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
2163 return 0;
2164 }
2165 EXPORT_SYMBOL_GPL(iscsi_conn_bind);
2166
2167
2168 int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
2169 enum iscsi_param param, char *buf, int buflen)
2170 {
2171 struct iscsi_conn *conn = cls_conn->dd_data;
2172 struct iscsi_session *session = conn->session;
2173 uint32_t value;
2174
2175 switch(param) {
2176 case ISCSI_PARAM_FAST_ABORT:
2177 sscanf(buf, "%d", &session->fast_abort);
2178 break;
2179 case ISCSI_PARAM_ABORT_TMO:
2180 sscanf(buf, "%d", &session->abort_timeout);
2181 break;
2182 case ISCSI_PARAM_LU_RESET_TMO:
2183 sscanf(buf, "%d", &session->lu_reset_timeout);
2184 break;
2185 case ISCSI_PARAM_PING_TMO:
2186 sscanf(buf, "%d", &conn->ping_timeout);
2187 break;
2188 case ISCSI_PARAM_RECV_TMO:
2189 sscanf(buf, "%d", &conn->recv_timeout);
2190 break;
2191 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2192 sscanf(buf, "%d", &conn->max_recv_dlength);
2193 break;
2194 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2195 sscanf(buf, "%d", &conn->max_xmit_dlength);
2196 break;
2197 case ISCSI_PARAM_HDRDGST_EN:
2198 sscanf(buf, "%d", &conn->hdrdgst_en);
2199 break;
2200 case ISCSI_PARAM_DATADGST_EN:
2201 sscanf(buf, "%d", &conn->datadgst_en);
2202 break;
2203 case ISCSI_PARAM_INITIAL_R2T_EN:
2204 sscanf(buf, "%d", &session->initial_r2t_en);
2205 break;
2206 case ISCSI_PARAM_MAX_R2T:
2207 sscanf(buf, "%d", &session->max_r2t);
2208 break;
2209 case ISCSI_PARAM_IMM_DATA_EN:
2210 sscanf(buf, "%d", &session->imm_data_en);
2211 break;
2212 case ISCSI_PARAM_FIRST_BURST:
2213 sscanf(buf, "%d", &session->first_burst);
2214 break;
2215 case ISCSI_PARAM_MAX_BURST:
2216 sscanf(buf, "%d", &session->max_burst);
2217 break;
2218 case ISCSI_PARAM_PDU_INORDER_EN:
2219 sscanf(buf, "%d", &session->pdu_inorder_en);
2220 break;
2221 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2222 sscanf(buf, "%d", &session->dataseq_inorder_en);
2223 break;
2224 case ISCSI_PARAM_ERL:
2225 sscanf(buf, "%d", &session->erl);
2226 break;
2227 case ISCSI_PARAM_IFMARKER_EN:
2228 sscanf(buf, "%d", &value);
2229 BUG_ON(value);
2230 break;
2231 case ISCSI_PARAM_OFMARKER_EN:
2232 sscanf(buf, "%d", &value);
2233 BUG_ON(value);
2234 break;
2235 case ISCSI_PARAM_EXP_STATSN:
2236 sscanf(buf, "%u", &conn->exp_statsn);
2237 break;
2238 case ISCSI_PARAM_USERNAME:
2239 kfree(session->username);
2240 session->username = kstrdup(buf, GFP_KERNEL);
2241 if (!session->username)
2242 return -ENOMEM;
2243 break;
2244 case ISCSI_PARAM_USERNAME_IN:
2245 kfree(session->username_in);
2246 session->username_in = kstrdup(buf, GFP_KERNEL);
2247 if (!session->username_in)
2248 return -ENOMEM;
2249 break;
2250 case ISCSI_PARAM_PASSWORD:
2251 kfree(session->password);
2252 session->password = kstrdup(buf, GFP_KERNEL);
2253 if (!session->password)
2254 return -ENOMEM;
2255 break;
2256 case ISCSI_PARAM_PASSWORD_IN:
2257 kfree(session->password_in);
2258 session->password_in = kstrdup(buf, GFP_KERNEL);
2259 if (!session->password_in)
2260 return -ENOMEM;
2261 break;
2262 case ISCSI_PARAM_TARGET_NAME:
2263 /* this should not change between logins */
2264 if (session->targetname)
2265 break;
2266
2267 session->targetname = kstrdup(buf, GFP_KERNEL);
2268 if (!session->targetname)
2269 return -ENOMEM;
2270 break;
2271 case ISCSI_PARAM_TPGT:
2272 sscanf(buf, "%d", &session->tpgt);
2273 break;
2274 case ISCSI_PARAM_PERSISTENT_PORT:
2275 sscanf(buf, "%d", &conn->persistent_port);
2276 break;
2277 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2278 /*
2279 * this is the address returned in discovery so it should
2280 * not change between logins.
2281 */
2282 if (conn->persistent_address)
2283 break;
2284
2285 conn->persistent_address = kstrdup(buf, GFP_KERNEL);
2286 if (!conn->persistent_address)
2287 return -ENOMEM;
2288 break;
2289 default:
2290 return -ENOSYS;
2291 }
2292
2293 return 0;
2294 }
2295 EXPORT_SYMBOL_GPL(iscsi_set_param);
2296
2297 int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
2298 enum iscsi_param param, char *buf)
2299 {
2300 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
2301 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
2302 int len;
2303
2304 switch(param) {
2305 case ISCSI_PARAM_FAST_ABORT:
2306 len = sprintf(buf, "%d\n", session->fast_abort);
2307 break;
2308 case ISCSI_PARAM_ABORT_TMO:
2309 len = sprintf(buf, "%d\n", session->abort_timeout);
2310 break;
2311 case ISCSI_PARAM_LU_RESET_TMO:
2312 len = sprintf(buf, "%d\n", session->lu_reset_timeout);
2313 break;
2314 case ISCSI_PARAM_INITIAL_R2T_EN:
2315 len = sprintf(buf, "%d\n", session->initial_r2t_en);
2316 break;
2317 case ISCSI_PARAM_MAX_R2T:
2318 len = sprintf(buf, "%hu\n", session->max_r2t);
2319 break;
2320 case ISCSI_PARAM_IMM_DATA_EN:
2321 len = sprintf(buf, "%d\n", session->imm_data_en);
2322 break;
2323 case ISCSI_PARAM_FIRST_BURST:
2324 len = sprintf(buf, "%u\n", session->first_burst);
2325 break;
2326 case ISCSI_PARAM_MAX_BURST:
2327 len = sprintf(buf, "%u\n", session->max_burst);
2328 break;
2329 case ISCSI_PARAM_PDU_INORDER_EN:
2330 len = sprintf(buf, "%d\n", session->pdu_inorder_en);
2331 break;
2332 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2333 len = sprintf(buf, "%d\n", session->dataseq_inorder_en);
2334 break;
2335 case ISCSI_PARAM_ERL:
2336 len = sprintf(buf, "%d\n", session->erl);
2337 break;
2338 case ISCSI_PARAM_TARGET_NAME:
2339 len = sprintf(buf, "%s\n", session->targetname);
2340 break;
2341 case ISCSI_PARAM_TPGT:
2342 len = sprintf(buf, "%d\n", session->tpgt);
2343 break;
2344 case ISCSI_PARAM_USERNAME:
2345 len = sprintf(buf, "%s\n", session->username);
2346 break;
2347 case ISCSI_PARAM_USERNAME_IN:
2348 len = sprintf(buf, "%s\n", session->username_in);
2349 break;
2350 case ISCSI_PARAM_PASSWORD:
2351 len = sprintf(buf, "%s\n", session->password);
2352 break;
2353 case ISCSI_PARAM_PASSWORD_IN:
2354 len = sprintf(buf, "%s\n", session->password_in);
2355 break;
2356 default:
2357 return -ENOSYS;
2358 }
2359
2360 return len;
2361 }
2362 EXPORT_SYMBOL_GPL(iscsi_session_get_param);
2363
2364 int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
2365 enum iscsi_param param, char *buf)
2366 {
2367 struct iscsi_conn *conn = cls_conn->dd_data;
2368 int len;
2369
2370 switch(param) {
2371 case ISCSI_PARAM_PING_TMO:
2372 len = sprintf(buf, "%u\n", conn->ping_timeout);
2373 break;
2374 case ISCSI_PARAM_RECV_TMO:
2375 len = sprintf(buf, "%u\n", conn->recv_timeout);
2376 break;
2377 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2378 len = sprintf(buf, "%u\n", conn->max_recv_dlength);
2379 break;
2380 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2381 len = sprintf(buf, "%u\n", conn->max_xmit_dlength);
2382 break;
2383 case ISCSI_PARAM_HDRDGST_EN:
2384 len = sprintf(buf, "%d\n", conn->hdrdgst_en);
2385 break;
2386 case ISCSI_PARAM_DATADGST_EN:
2387 len = sprintf(buf, "%d\n", conn->datadgst_en);
2388 break;
2389 case ISCSI_PARAM_IFMARKER_EN:
2390 len = sprintf(buf, "%d\n", conn->ifmarker_en);
2391 break;
2392 case ISCSI_PARAM_OFMARKER_EN:
2393 len = sprintf(buf, "%d\n", conn->ofmarker_en);
2394 break;
2395 case ISCSI_PARAM_EXP_STATSN:
2396 len = sprintf(buf, "%u\n", conn->exp_statsn);
2397 break;
2398 case ISCSI_PARAM_PERSISTENT_PORT:
2399 len = sprintf(buf, "%d\n", conn->persistent_port);
2400 break;
2401 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2402 len = sprintf(buf, "%s\n", conn->persistent_address);
2403 break;
2404 default:
2405 return -ENOSYS;
2406 }
2407
2408 return len;
2409 }
2410 EXPORT_SYMBOL_GPL(iscsi_conn_get_param);
2411
2412 int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2413 char *buf)
2414 {
2415 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
2416 int len;
2417
2418 switch (param) {
2419 case ISCSI_HOST_PARAM_NETDEV_NAME:
2420 if (!session->netdev)
2421 len = sprintf(buf, "%s\n", "default");
2422 else
2423 len = sprintf(buf, "%s\n", session->netdev);
2424 break;
2425 case ISCSI_HOST_PARAM_HWADDRESS:
2426 if (!session->hwaddress)
2427 len = sprintf(buf, "%s\n", "default");
2428 else
2429 len = sprintf(buf, "%s\n", session->hwaddress);
2430 break;
2431 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2432 if (!session->initiatorname)
2433 len = sprintf(buf, "%s\n", "unknown");
2434 else
2435 len = sprintf(buf, "%s\n", session->initiatorname);
2436 break;
2437
2438 default:
2439 return -ENOSYS;
2440 }
2441
2442 return len;
2443 }
2444 EXPORT_SYMBOL_GPL(iscsi_host_get_param);
2445
2446 int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2447 char *buf, int buflen)
2448 {
2449 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
2450
2451 switch (param) {
2452 case ISCSI_HOST_PARAM_NETDEV_NAME:
2453 if (!session->netdev)
2454 session->netdev = kstrdup(buf, GFP_KERNEL);
2455 break;
2456 case ISCSI_HOST_PARAM_HWADDRESS:
2457 if (!session->hwaddress)
2458 session->hwaddress = kstrdup(buf, GFP_KERNEL);
2459 break;
2460 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2461 if (!session->initiatorname)
2462 session->initiatorname = kstrdup(buf, GFP_KERNEL);
2463 break;
2464 default:
2465 return -ENOSYS;
2466 }
2467
2468 return 0;
2469 }
2470 EXPORT_SYMBOL_GPL(iscsi_host_set_param);
2471
2472 MODULE_AUTHOR("Mike Christie");
2473 MODULE_DESCRIPTION("iSCSI library functions");
2474 MODULE_LICENSE("GPL");
cpufreq for S3C2410