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