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[PATCH] Fix sparse annotation of spin unlock macros in one case
[linux-2.6/kvm.git] / drivers / scsi / libiscsi.c
blob7c75771c77ff4aa32559b0cfeab48626fe65d47e
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/mutex.h>
26 #include <linux/kfifo.h>
27 #include <linux/delay.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 #define INVALID_SN_DELTA 0xffff
49
50 int
51 iscsi_check_assign_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr)
52 {
53 uint32_t max_cmdsn = be32_to_cpu(hdr->max_cmdsn);
54 uint32_t exp_cmdsn = be32_to_cpu(hdr->exp_cmdsn);
55
56 if (max_cmdsn < exp_cmdsn -1 &&
57 max_cmdsn > exp_cmdsn - INVALID_SN_DELTA)
58 return ISCSI_ERR_MAX_CMDSN;
59 if (max_cmdsn > session->max_cmdsn ||
60 max_cmdsn < session->max_cmdsn - INVALID_SN_DELTA)
61 session->max_cmdsn = max_cmdsn;
62 if (exp_cmdsn > session->exp_cmdsn ||
63 exp_cmdsn < session->exp_cmdsn - INVALID_SN_DELTA)
64 session->exp_cmdsn = exp_cmdsn;
65
66 return 0;
67 }
68 EXPORT_SYMBOL_GPL(iscsi_check_assign_cmdsn);
69
70 void iscsi_prep_unsolicit_data_pdu(struct iscsi_cmd_task *ctask,
71 struct iscsi_data *hdr)
72 {
73 struct iscsi_conn *conn = ctask->conn;
74
75 memset(hdr, 0, sizeof(struct iscsi_data));
76 hdr->ttt = cpu_to_be32(ISCSI_RESERVED_TAG);
77 hdr->datasn = cpu_to_be32(ctask->unsol_datasn);
78 ctask->unsol_datasn++;
79 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
80 memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
81
82 hdr->itt = ctask->hdr->itt;
83 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
84 hdr->offset = cpu_to_be32(ctask->unsol_offset);
85
86 if (ctask->unsol_count > conn->max_xmit_dlength) {
87 hton24(hdr->dlength, conn->max_xmit_dlength);
88 ctask->data_count = conn->max_xmit_dlength;
89 ctask->unsol_offset += ctask->data_count;
90 hdr->flags = 0;
91 } else {
92 hton24(hdr->dlength, ctask->unsol_count);
93 ctask->data_count = ctask->unsol_count;
94 hdr->flags = ISCSI_FLAG_CMD_FINAL;
95 }
96 }
97 EXPORT_SYMBOL_GPL(iscsi_prep_unsolicit_data_pdu);
98
99 /**
100 * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
101 * @ctask: iscsi cmd task
102 *
103 * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set
104 * fields like dlength or final based on how much data it sends
105 */
106 static void iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask)
107 {
108 struct iscsi_conn *conn = ctask->conn;
109 struct iscsi_session *session = conn->session;
110 struct iscsi_cmd *hdr = ctask->hdr;
111 struct scsi_cmnd *sc = ctask->sc;
112
113 hdr->opcode = ISCSI_OP_SCSI_CMD;
114 hdr->flags = ISCSI_ATTR_SIMPLE;
115 int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun);
116 hdr->itt = build_itt(ctask->itt, conn->id, session->age);
117 hdr->data_length = cpu_to_be32(sc->request_bufflen);
118 hdr->cmdsn = cpu_to_be32(session->cmdsn);
119 session->cmdsn++;
120 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
121 memcpy(hdr->cdb, sc->cmnd, sc->cmd_len);
122 memset(&hdr->cdb[sc->cmd_len], 0, MAX_COMMAND_SIZE - sc->cmd_len);
123
124 ctask->data_count = 0;
125 if (sc->sc_data_direction == DMA_TO_DEVICE) {
126 hdr->flags |= ISCSI_FLAG_CMD_WRITE;
127 /*
128 * Write counters:
129 *
130 * imm_count bytes to be sent right after
131 * SCSI PDU Header
132 *
133 * unsol_count bytes(as Data-Out) to be sent
134 * without R2T ack right after
135 * immediate data
136 *
137 * r2t_data_count bytes to be sent via R2T ack's
138 *
139 * pad_count bytes to be sent as zero-padding
140 */
141 ctask->imm_count = 0;
142 ctask->unsol_count = 0;
143 ctask->unsol_offset = 0;
144 ctask->unsol_datasn = 0;
145
146 if (session->imm_data_en) {
147 if (ctask->total_length >= session->first_burst)
148 ctask->imm_count = min(session->first_burst,
149 conn->max_xmit_dlength);
150 else
151 ctask->imm_count = min(ctask->total_length,
152 conn->max_xmit_dlength);
153 hton24(ctask->hdr->dlength, ctask->imm_count);
154 } else
155 zero_data(ctask->hdr->dlength);
156
157 if (!session->initial_r2t_en) {
158 ctask->unsol_count = min(session->first_burst,
159 ctask->total_length) - ctask->imm_count;
160 ctask->unsol_offset = ctask->imm_count;
161 }
162
163 if (!ctask->unsol_count)
164 /* No unsolicit Data-Out's */
165 ctask->hdr->flags |= ISCSI_FLAG_CMD_FINAL;
166 } else {
167 ctask->datasn = 0;
168 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
169 zero_data(hdr->dlength);
170
171 if (sc->sc_data_direction == DMA_FROM_DEVICE)
172 hdr->flags |= ISCSI_FLAG_CMD_READ;
173 }
174
175 conn->scsicmd_pdus_cnt++;
176 }
177 EXPORT_SYMBOL_GPL(iscsi_prep_scsi_cmd_pdu);
178
179 /**
180 * iscsi_complete_command - return command back to scsi-ml
181 * @ctask: iscsi cmd task
182 *
183 * Must be called with session lock.
184 * This function returns the scsi command to scsi-ml and returns
185 * the cmd task to the pool of available cmd tasks.
186 */
187 static void iscsi_complete_command(struct iscsi_cmd_task *ctask)
188 {
189 struct iscsi_session *session = ctask->conn->session;
190 struct scsi_cmnd *sc = ctask->sc;
191
192 ctask->state = ISCSI_TASK_COMPLETED;
193 ctask->sc = NULL;
194 /* SCSI eh reuses commands to verify us */
195 sc->SCp.ptr = NULL;
196 list_del_init(&ctask->running);
197 __kfifo_put(session->cmdpool.queue, (void*)&ctask, sizeof(void*));
198 sc->scsi_done(sc);
199 }
200
201 static void __iscsi_get_ctask(struct iscsi_cmd_task *ctask)
202 {
203 atomic_inc(&ctask->refcount);
204 }
205
206 static void iscsi_get_ctask(struct iscsi_cmd_task *ctask)
207 {
208 spin_lock_bh(&ctask->conn->session->lock);
209 __iscsi_get_ctask(ctask);
210 spin_unlock_bh(&ctask->conn->session->lock);
211 }
212
213 static void __iscsi_put_ctask(struct iscsi_cmd_task *ctask)
214 {
215 if (atomic_dec_and_test(&ctask->refcount))
216 iscsi_complete_command(ctask);
217 }
218
219 static void iscsi_put_ctask(struct iscsi_cmd_task *ctask)
220 {
221 spin_lock_bh(&ctask->conn->session->lock);
222 __iscsi_put_ctask(ctask);
223 spin_unlock_bh(&ctask->conn->session->lock);
224 }
225
226 /**
227 * iscsi_cmd_rsp - SCSI Command Response processing
228 * @conn: iscsi connection
229 * @hdr: iscsi header
230 * @ctask: scsi command task
231 * @data: cmd data buffer
232 * @datalen: len of buffer
233 *
234 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and
235 * then completes the command and task.
236 **/
237 static int iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
238 struct iscsi_cmd_task *ctask, char *data,
239 int datalen)
240 {
241 int rc;
242 struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)hdr;
243 struct iscsi_session *session = conn->session;
244 struct scsi_cmnd *sc = ctask->sc;
245
246 rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr);
247 if (rc) {
248 sc->result = DID_ERROR << 16;
249 goto out;
250 }
251
252 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
253
254 sc->result = (DID_OK << 16) | rhdr->cmd_status;
255
256 if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) {
257 sc->result = DID_ERROR << 16;
258 goto out;
259 }
260
261 if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) {
262 uint16_t senselen;
263
264 if (datalen < 2) {
265 invalid_datalen:
266 printk(KERN_ERR "iscsi: Got CHECK_CONDITION but "
267 "invalid data buffer size of %d\n", datalen);
268 sc->result = DID_BAD_TARGET << 16;
269 goto out;
270 }
271
272 senselen = be16_to_cpu(*(__be16 *)data);
273 if (datalen < senselen)
274 goto invalid_datalen;
275
276 memcpy(sc->sense_buffer, data + 2,
277 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
278 debug_scsi("copied %d bytes of sense\n",
279 min(senselen, SCSI_SENSE_BUFFERSIZE));
280 }
281
282 if (sc->sc_data_direction == DMA_TO_DEVICE)
283 goto out;
284
285 if (rhdr->flags & ISCSI_FLAG_CMD_UNDERFLOW) {
286 int res_count = be32_to_cpu(rhdr->residual_count);
287
288 if (res_count > 0 && res_count <= sc->request_bufflen)
289 sc->resid = res_count;
290 else
291 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
292 } else if (rhdr->flags & ISCSI_FLAG_CMD_BIDI_UNDERFLOW)
293 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
294 else if (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW)
295 sc->resid = be32_to_cpu(rhdr->residual_count);
296
297 out:
298 debug_scsi("done [sc %lx res %d itt 0x%x]\n",
299 (long)sc, sc->result, ctask->itt);
300 conn->scsirsp_pdus_cnt++;
301
302 __iscsi_put_ctask(ctask);
303 return rc;
304 }
305
306 static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
307 {
308 struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr;
309
310 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
311 conn->tmfrsp_pdus_cnt++;
312
313 if (conn->tmabort_state != TMABORT_INITIAL)
314 return;
315
316 if (tmf->response == ISCSI_TMF_RSP_COMPLETE)
317 conn->tmabort_state = TMABORT_SUCCESS;
318 else if (tmf->response == ISCSI_TMF_RSP_NO_TASK)
319 conn->tmabort_state = TMABORT_NOT_FOUND;
320 else
321 conn->tmabort_state = TMABORT_FAILED;
322 wake_up(&conn->ehwait);
323 }
324
325 static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
326 char *data, int datalen)
327 {
328 struct iscsi_reject *reject = (struct iscsi_reject *)hdr;
329 struct iscsi_hdr rejected_pdu;
330 uint32_t itt;
331
332 conn->exp_statsn = be32_to_cpu(reject->statsn) + 1;
333
334 if (reject->reason == ISCSI_REASON_DATA_DIGEST_ERROR) {
335 if (ntoh24(reject->dlength) > datalen)
336 return ISCSI_ERR_PROTO;
337
338 if (ntoh24(reject->dlength) >= sizeof(struct iscsi_hdr)) {
339 memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr));
340 itt = get_itt(rejected_pdu.itt);
341 printk(KERN_ERR "itt 0x%x had pdu (op 0x%x) rejected "
342 "due to DataDigest error.\n", itt,
343 rejected_pdu.opcode);
344 }
345 }
346 return 0;
347 }
348
349 /**
350 * __iscsi_complete_pdu - complete pdu
351 * @conn: iscsi conn
352 * @hdr: iscsi header
353 * @data: data buffer
354 * @datalen: len of data buffer
355 *
356 * Completes pdu processing by freeing any resources allocated at
357 * queuecommand or send generic. session lock must be held and verify
358 * itt must have been called.
359 */
360 int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
361 char *data, int datalen)
362 {
363 struct iscsi_session *session = conn->session;
364 int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0;
365 struct iscsi_cmd_task *ctask;
366 struct iscsi_mgmt_task *mtask;
367 uint32_t itt;
368
369 if (hdr->itt != RESERVED_ITT)
370 itt = get_itt(hdr->itt);
371 else
372 itt = ~0U;
373
374 if (itt < session->cmds_max) {
375 ctask = session->cmds[itt];
376
377 debug_scsi("cmdrsp [op 0x%x cid %d itt 0x%x len %d]\n",
378 opcode, conn->id, ctask->itt, datalen);
379
380 switch(opcode) {
381 case ISCSI_OP_SCSI_CMD_RSP:
382 BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
383 rc = iscsi_scsi_cmd_rsp(conn, hdr, ctask, data,
384 datalen);
385 break;
386 case ISCSI_OP_SCSI_DATA_IN:
387 BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
388 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
389 conn->scsirsp_pdus_cnt++;
390 __iscsi_put_ctask(ctask);
391 }
392 break;
393 case ISCSI_OP_R2T:
394 /* LLD handles this for now */
395 break;
396 default:
397 rc = ISCSI_ERR_BAD_OPCODE;
398 break;
399 }
400 } else if (itt >= ISCSI_MGMT_ITT_OFFSET &&
401 itt < ISCSI_MGMT_ITT_OFFSET + session->mgmtpool_max) {
402 mtask = session->mgmt_cmds[itt - ISCSI_MGMT_ITT_OFFSET];
403
404 debug_scsi("immrsp [op 0x%x cid %d itt 0x%x len %d]\n",
405 opcode, conn->id, mtask->itt, datalen);
406
407 rc = iscsi_check_assign_cmdsn(session,
408 (struct iscsi_nopin*)hdr);
409 if (rc)
410 goto done;
411
412 switch(opcode) {
413 case ISCSI_OP_LOGOUT_RSP:
414 if (datalen) {
415 rc = ISCSI_ERR_PROTO;
416 break;
417 }
418 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
419 /* fall through */
420 case ISCSI_OP_LOGIN_RSP:
421 case ISCSI_OP_TEXT_RSP:
422 /*
423 * login related PDU's exp_statsn is handled in
424 * userspace
425 */
426 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
427 rc = ISCSI_ERR_CONN_FAILED;
428 list_del(&mtask->running);
429 if (conn->login_mtask != mtask)
430 __kfifo_put(session->mgmtpool.queue,
431 (void*)&mtask, sizeof(void*));
432 break;
433 case ISCSI_OP_SCSI_TMFUNC_RSP:
434 if (datalen) {
435 rc = ISCSI_ERR_PROTO;
436 break;
437 }
438
439 iscsi_tmf_rsp(conn, hdr);
440 break;
441 case ISCSI_OP_NOOP_IN:
442 if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) {
443 rc = ISCSI_ERR_PROTO;
444 break;
445 }
446 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
447
448 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
449 rc = ISCSI_ERR_CONN_FAILED;
450 list_del(&mtask->running);
451 if (conn->login_mtask != mtask)
452 __kfifo_put(session->mgmtpool.queue,
453 (void*)&mtask, sizeof(void*));
454 break;
455 default:
456 rc = ISCSI_ERR_BAD_OPCODE;
457 break;
458 }
459 } else if (itt == ~0U) {
460 rc = iscsi_check_assign_cmdsn(session,
461 (struct iscsi_nopin*)hdr);
462 if (rc)
463 goto done;
464
465 switch(opcode) {
466 case ISCSI_OP_NOOP_IN:
467 if (datalen) {
468 rc = ISCSI_ERR_PROTO;
469 break;
470 }
471
472 if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG))
473 break;
474
475 if (iscsi_recv_pdu(conn->cls_conn, hdr, NULL, 0))
476 rc = ISCSI_ERR_CONN_FAILED;
477 break;
478 case ISCSI_OP_REJECT:
479 rc = iscsi_handle_reject(conn, hdr, data, datalen);
480 break;
481 case ISCSI_OP_ASYNC_EVENT:
482 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
483 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
484 rc = ISCSI_ERR_CONN_FAILED;
485 break;
486 default:
487 rc = ISCSI_ERR_BAD_OPCODE;
488 break;
489 }
490 } else
491 rc = ISCSI_ERR_BAD_ITT;
492
493 done:
494 return rc;
495 }
496 EXPORT_SYMBOL_GPL(__iscsi_complete_pdu);
497
498 int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
499 char *data, int datalen)
500 {
501 int rc;
502
503 spin_lock(&conn->session->lock);
504 rc = __iscsi_complete_pdu(conn, hdr, data, datalen);
505 spin_unlock(&conn->session->lock);
506 return rc;
507 }
508 EXPORT_SYMBOL_GPL(iscsi_complete_pdu);
509
510 /* verify itt (itt encoding: age+cid+itt) */
511 int iscsi_verify_itt(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
512 uint32_t *ret_itt)
513 {
514 struct iscsi_session *session = conn->session;
515 struct iscsi_cmd_task *ctask;
516 uint32_t itt;
517
518 if (hdr->itt != RESERVED_ITT) {
519 if (((__force u32)hdr->itt & ISCSI_AGE_MASK) !=
520 (session->age << ISCSI_AGE_SHIFT)) {
521 printk(KERN_ERR "iscsi: received itt %x expected "
522 "session age (%x)\n", (__force u32)hdr->itt,
523 session->age & ISCSI_AGE_MASK);
524 return ISCSI_ERR_BAD_ITT;
525 }
526
527 if (((__force u32)hdr->itt & ISCSI_CID_MASK) !=
528 (conn->id << ISCSI_CID_SHIFT)) {
529 printk(KERN_ERR "iscsi: received itt %x, expected "
530 "CID (%x)\n", (__force u32)hdr->itt, conn->id);
531 return ISCSI_ERR_BAD_ITT;
532 }
533 itt = get_itt(hdr->itt);
534 } else
535 itt = ~0U;
536
537 if (itt < session->cmds_max) {
538 ctask = session->cmds[itt];
539
540 if (!ctask->sc) {
541 printk(KERN_INFO "iscsi: dropping ctask with "
542 "itt 0x%x\n", ctask->itt);
543 /* force drop */
544 return ISCSI_ERR_NO_SCSI_CMD;
545 }
546
547 if (ctask->sc->SCp.phase != session->age) {
548 printk(KERN_ERR "iscsi: ctask's session age %d, "
549 "expected %d\n", ctask->sc->SCp.phase,
550 session->age);
551 return ISCSI_ERR_SESSION_FAILED;
552 }
553 }
554
555 *ret_itt = itt;
556 return 0;
557 }
558 EXPORT_SYMBOL_GPL(iscsi_verify_itt);
559
560 void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
561 {
562 struct iscsi_session *session = conn->session;
563 unsigned long flags;
564
565 spin_lock_irqsave(&session->lock, flags);
566 if (session->state == ISCSI_STATE_FAILED) {
567 spin_unlock_irqrestore(&session->lock, flags);
568 return;
569 }
570
571 if (conn->stop_stage == 0)
572 session->state = ISCSI_STATE_FAILED;
573 spin_unlock_irqrestore(&session->lock, flags);
574 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
575 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
576 iscsi_conn_error(conn->cls_conn, err);
577 }
578 EXPORT_SYMBOL_GPL(iscsi_conn_failure);
579
580 static int iscsi_xmit_imm_task(struct iscsi_conn *conn)
581 {
582 struct iscsi_hdr *hdr = conn->mtask->hdr;
583 int rc, was_logout = 0;
584
585 if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT) {
586 conn->session->state = ISCSI_STATE_IN_RECOVERY;
587 iscsi_block_session(session_to_cls(conn->session));
588 was_logout = 1;
589 }
590 rc = conn->session->tt->xmit_mgmt_task(conn, conn->mtask);
591 if (rc)
592 return rc;
593
594 if (was_logout) {
595 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
596 return -ENODATA;
597 }
598 return 0;
599 }
600
601 /**
602 * iscsi_data_xmit - xmit any command into the scheduled connection
603 * @conn: iscsi connection
604 *
605 * Notes:
606 * The function can return -EAGAIN in which case the caller must
607 * re-schedule it again later or recover. '0' return code means
608 * successful xmit.
609 **/
610 static int iscsi_data_xmit(struct iscsi_conn *conn)
611 {
612 struct iscsi_transport *tt;
613 int rc = 0;
614
615 if (unlikely(conn->suspend_tx)) {
616 debug_scsi("conn %d Tx suspended!\n", conn->id);
617 return -ENODATA;
618 }
619 tt = conn->session->tt;
620
621 /*
622 * Transmit in the following order:
623 *
624 * 1) un-finished xmit (ctask or mtask)
625 * 2) immediate control PDUs
626 * 3) write data
627 * 4) SCSI commands
628 * 5) non-immediate control PDUs
629 *
630 * No need to lock around __kfifo_get as long as
631 * there's one producer and one consumer.
632 */
633
634 BUG_ON(conn->ctask && conn->mtask);
635
636 if (conn->ctask) {
637 iscsi_get_ctask(conn->ctask);
638 rc = tt->xmit_cmd_task(conn, conn->ctask);
639 iscsi_put_ctask(conn->ctask);
640 if (rc)
641 goto again;
642 /* done with this in-progress ctask */
643 conn->ctask = NULL;
644 }
645 if (conn->mtask) {
646 rc = iscsi_xmit_imm_task(conn);
647 if (rc)
648 goto again;
649 /* done with this in-progress mtask */
650 conn->mtask = NULL;
651 }
652
653 /* process immediate first */
654 if (unlikely(__kfifo_len(conn->immqueue))) {
655 while (__kfifo_get(conn->immqueue, (void*)&conn->mtask,
656 sizeof(void*))) {
657 spin_lock_bh(&conn->session->lock);
658 list_add_tail(&conn->mtask->running,
659 &conn->mgmt_run_list);
660 spin_unlock_bh(&conn->session->lock);
661 rc = iscsi_xmit_imm_task(conn);
662 if (rc)
663 goto again;
664 }
665 /* done with this mtask */
666 conn->mtask = NULL;
667 }
668
669 /* process command queue */
670 spin_lock_bh(&conn->session->lock);
671 while (!list_empty(&conn->xmitqueue)) {
672 /*
673 * iscsi tcp may readd the task to the xmitqueue to send
674 * write data
675 */
676 conn->ctask = list_entry(conn->xmitqueue.next,
677 struct iscsi_cmd_task, running);
678 conn->ctask->state = ISCSI_TASK_RUNNING;
679 list_move_tail(conn->xmitqueue.next, &conn->run_list);
680 __iscsi_get_ctask(conn->ctask);
681 spin_unlock_bh(&conn->session->lock);
682
683 rc = tt->xmit_cmd_task(conn, conn->ctask);
684
685 spin_lock_bh(&conn->session->lock);
686 __iscsi_put_ctask(conn->ctask);
687 if (rc) {
688 spin_unlock_bh(&conn->session->lock);
689 goto again;
690 }
691 }
692 spin_unlock_bh(&conn->session->lock);
693 /* done with this ctask */
694 conn->ctask = NULL;
695
696 /* process the rest control plane PDUs, if any */
697 if (unlikely(__kfifo_len(conn->mgmtqueue))) {
698 while (__kfifo_get(conn->mgmtqueue, (void*)&conn->mtask,
699 sizeof(void*))) {
700 spin_lock_bh(&conn->session->lock);
701 list_add_tail(&conn->mtask->running,
702 &conn->mgmt_run_list);
703 spin_unlock_bh(&conn->session->lock);
704 rc = tt->xmit_mgmt_task(conn, conn->mtask);
705 if (rc)
706 goto again;
707 }
708 /* done with this mtask */
709 conn->mtask = NULL;
710 }
711
712 return -ENODATA;
713
714 again:
715 if (unlikely(conn->suspend_tx))
716 return -ENODATA;
717
718 return rc;
719 }
720
721 static void iscsi_xmitworker(struct work_struct *work)
722 {
723 struct iscsi_conn *conn =
724 container_of(work, struct iscsi_conn, xmitwork);
725 int rc;
726 /*
727 * serialize Xmit worker on a per-connection basis.
728 */
729 mutex_lock(&conn->xmitmutex);
730 do {
731 rc = iscsi_data_xmit(conn);
732 } while (rc >= 0 || rc == -EAGAIN);
733 mutex_unlock(&conn->xmitmutex);
734 }
735
736 enum {
737 FAILURE_BAD_HOST = 1,
738 FAILURE_SESSION_FAILED,
739 FAILURE_SESSION_FREED,
740 FAILURE_WINDOW_CLOSED,
741 FAILURE_OOM,
742 FAILURE_SESSION_TERMINATE,
743 FAILURE_SESSION_IN_RECOVERY,
744 FAILURE_SESSION_RECOVERY_TIMEOUT,
745 };
746
747 int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
748 {
749 struct Scsi_Host *host;
750 int reason = 0;
751 struct iscsi_session *session;
752 struct iscsi_conn *conn;
753 struct iscsi_cmd_task *ctask = NULL;
754
755 sc->scsi_done = done;
756 sc->result = 0;
757 sc->SCp.ptr = NULL;
758
759 host = sc->device->host;
760 session = iscsi_hostdata(host->hostdata);
761
762 spin_lock(&session->lock);
763
764 /*
765 * ISCSI_STATE_FAILED is a temp. state. The recovery
766 * code will decide what is best to do with command queued
767 * during this time
768 */
769 if (session->state != ISCSI_STATE_LOGGED_IN &&
770 session->state != ISCSI_STATE_FAILED) {
771 /*
772 * to handle the race between when we set the recovery state
773 * and block the session we requeue here (commands could
774 * be entering our queuecommand while a block is starting
775 * up because the block code is not locked)
776 */
777 if (session->state == ISCSI_STATE_IN_RECOVERY) {
778 reason = FAILURE_SESSION_IN_RECOVERY;
779 goto reject;
780 }
781
782 if (session->state == ISCSI_STATE_RECOVERY_FAILED)
783 reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
784 else if (session->state == ISCSI_STATE_TERMINATE)
785 reason = FAILURE_SESSION_TERMINATE;
786 else
787 reason = FAILURE_SESSION_FREED;
788 goto fault;
789 }
790
791 /*
792 * Check for iSCSI window and take care of CmdSN wrap-around
793 */
794 if ((int)(session->max_cmdsn - session->cmdsn) < 0) {
795 reason = FAILURE_WINDOW_CLOSED;
796 goto reject;
797 }
798
799 conn = session->leadconn;
800 if (!conn) {
801 reason = FAILURE_SESSION_FREED;
802 goto fault;
803 }
804
805 if (!__kfifo_get(session->cmdpool.queue, (void*)&ctask,
806 sizeof(void*))) {
807 reason = FAILURE_OOM;
808 goto reject;
809 }
810 sc->SCp.phase = session->age;
811 sc->SCp.ptr = (char *)ctask;
812
813 atomic_set(&ctask->refcount, 1);
814 ctask->state = ISCSI_TASK_PENDING;
815 ctask->mtask = NULL;
816 ctask->conn = conn;
817 ctask->sc = sc;
818 INIT_LIST_HEAD(&ctask->running);
819 ctask->total_length = sc->request_bufflen;
820 iscsi_prep_scsi_cmd_pdu(ctask);
821
822 session->tt->init_cmd_task(ctask);
823
824 list_add_tail(&ctask->running, &conn->xmitqueue);
825 debug_scsi(
826 "ctask enq [%s cid %d sc %p cdb 0x%x itt 0x%x len %d cmdsn %d "
827 "win %d]\n",
828 sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read",
829 conn->id, sc, sc->cmnd[0], ctask->itt, sc->request_bufflen,
830 session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1);
831 spin_unlock(&session->lock);
832
833 scsi_queue_work(host, &conn->xmitwork);
834 return 0;
835
836 reject:
837 spin_unlock(&session->lock);
838 debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason);
839 return SCSI_MLQUEUE_HOST_BUSY;
840
841 fault:
842 spin_unlock(&session->lock);
843 printk(KERN_ERR "iscsi: cmd 0x%x is not queued (%d)\n",
844 sc->cmnd[0], reason);
845 sc->result = (DID_NO_CONNECT << 16);
846 sc->resid = sc->request_bufflen;
847 sc->scsi_done(sc);
848 return 0;
849 }
850 EXPORT_SYMBOL_GPL(iscsi_queuecommand);
851
852 int iscsi_change_queue_depth(struct scsi_device *sdev, int depth)
853 {
854 if (depth > ISCSI_MAX_CMD_PER_LUN)
855 depth = ISCSI_MAX_CMD_PER_LUN;
856 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
857 return sdev->queue_depth;
858 }
859 EXPORT_SYMBOL_GPL(iscsi_change_queue_depth);
860
861 static int
862 iscsi_conn_send_generic(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
863 char *data, uint32_t data_size)
864 {
865 struct iscsi_session *session = conn->session;
866 struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
867 struct iscsi_mgmt_task *mtask;
868
869 spin_lock_bh(&session->lock);
870 if (session->state == ISCSI_STATE_TERMINATE) {
871 spin_unlock_bh(&session->lock);
872 return -EPERM;
873 }
874 if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) ||
875 hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
876 /*
877 * Login and Text are sent serially, in
878 * request-followed-by-response sequence.
879 * Same mtask can be used. Same ITT must be used.
880 * Note that login_mtask is preallocated at conn_create().
881 */
882 mtask = conn->login_mtask;
883 else {
884 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
885 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
886
887 nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
888 if (!__kfifo_get(session->mgmtpool.queue,
889 (void*)&mtask, sizeof(void*))) {
890 spin_unlock_bh(&session->lock);
891 return -ENOSPC;
892 }
893 }
894
895 /*
896 * pre-format CmdSN for outgoing PDU.
897 */
898 if (hdr->itt != RESERVED_ITT) {
899 hdr->itt = build_itt(mtask->itt, conn->id, session->age);
900 nop->cmdsn = cpu_to_be32(session->cmdsn);
901 if (conn->c_stage == ISCSI_CONN_STARTED &&
902 !(hdr->opcode & ISCSI_OP_IMMEDIATE))
903 session->cmdsn++;
904 } else
905 /* do not advance CmdSN */
906 nop->cmdsn = cpu_to_be32(session->cmdsn);
907
908 if (data_size) {
909 memcpy(mtask->data, data, data_size);
910 mtask->data_count = data_size;
911 } else
912 mtask->data_count = 0;
913
914 INIT_LIST_HEAD(&mtask->running);
915 memcpy(mtask->hdr, hdr, sizeof(struct iscsi_hdr));
916 if (session->tt->init_mgmt_task)
917 session->tt->init_mgmt_task(conn, mtask, data, data_size);
918 spin_unlock_bh(&session->lock);
919
920 debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n",
921 hdr->opcode, hdr->itt, data_size);
922
923 /*
924 * since send_pdu() could be called at least from two contexts,
925 * we need to serialize __kfifo_put, so we don't have to take
926 * additional lock on fast data-path
927 */
928 if (hdr->opcode & ISCSI_OP_IMMEDIATE)
929 __kfifo_put(conn->immqueue, (void*)&mtask, sizeof(void*));
930 else
931 __kfifo_put(conn->mgmtqueue, (void*)&mtask, sizeof(void*));
932
933 scsi_queue_work(session->host, &conn->xmitwork);
934 return 0;
935 }
936
937 int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr,
938 char *data, uint32_t data_size)
939 {
940 struct iscsi_conn *conn = cls_conn->dd_data;
941 int rc;
942
943 mutex_lock(&conn->xmitmutex);
944 rc = iscsi_conn_send_generic(conn, hdr, data, data_size);
945 mutex_unlock(&conn->xmitmutex);
946
947 return rc;
948 }
949 EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu);
950
951 void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
952 {
953 struct iscsi_session *session = class_to_transport_session(cls_session);
954 struct iscsi_conn *conn = session->leadconn;
955
956 spin_lock_bh(&session->lock);
957 if (session->state != ISCSI_STATE_LOGGED_IN) {
958 session->state = ISCSI_STATE_RECOVERY_FAILED;
959 if (conn)
960 wake_up(&conn->ehwait);
961 }
962 spin_unlock_bh(&session->lock);
963 }
964 EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
965
966 int iscsi_eh_host_reset(struct scsi_cmnd *sc)
967 {
968 struct Scsi_Host *host = sc->device->host;
969 struct iscsi_session *session = iscsi_hostdata(host->hostdata);
970 struct iscsi_conn *conn = session->leadconn;
971 int fail_session = 0;
972
973 spin_lock_bh(&session->lock);
974 if (session->state == ISCSI_STATE_TERMINATE) {
975 failed:
976 debug_scsi("failing host reset: session terminated "
977 "[CID %d age %d]\n", conn->id, session->age);
978 spin_unlock_bh(&session->lock);
979 return FAILED;
980 }
981
982 if (sc->SCp.phase == session->age) {
983 debug_scsi("failing connection CID %d due to SCSI host reset\n",
984 conn->id);
985 fail_session = 1;
986 }
987 spin_unlock_bh(&session->lock);
988
989 /*
990 * we drop the lock here but the leadconn cannot be destoyed while
991 * we are in the scsi eh
992 */
993 if (fail_session)
994 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
995
996 debug_scsi("iscsi_eh_host_reset wait for relogin\n");
997 wait_event_interruptible(conn->ehwait,
998 session->state == ISCSI_STATE_TERMINATE ||
999 session->state == ISCSI_STATE_LOGGED_IN ||
1000 session->state == ISCSI_STATE_RECOVERY_FAILED);
1001 if (signal_pending(current))
1002 flush_signals(current);
1003
1004 spin_lock_bh(&session->lock);
1005 if (session->state == ISCSI_STATE_LOGGED_IN)
1006 printk(KERN_INFO "iscsi: host reset succeeded\n");
1007 else
1008 goto failed;
1009 spin_unlock_bh(&session->lock);
1010
1011 return SUCCESS;
1012 }
1013 EXPORT_SYMBOL_GPL(iscsi_eh_host_reset);
1014
1015 static void iscsi_tmabort_timedout(unsigned long data)
1016 {
1017 struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)data;
1018 struct iscsi_conn *conn = ctask->conn;
1019 struct iscsi_session *session = conn->session;
1020
1021 spin_lock(&session->lock);
1022 if (conn->tmabort_state == TMABORT_INITIAL) {
1023 conn->tmabort_state = TMABORT_TIMEDOUT;
1024 debug_scsi("tmabort timedout [sc %p itt 0x%x]\n",
1025 ctask->sc, ctask->itt);
1026 /* unblock eh_abort() */
1027 wake_up(&conn->ehwait);
1028 }
1029 spin_unlock(&session->lock);
1030 }
1031
1032 /* must be called with the mutex lock */
1033 static int iscsi_exec_abort_task(struct scsi_cmnd *sc,
1034 struct iscsi_cmd_task *ctask)
1035 {
1036 struct iscsi_conn *conn = ctask->conn;
1037 struct iscsi_session *session = conn->session;
1038 struct iscsi_tm *hdr = &conn->tmhdr;
1039 int rc;
1040
1041 /*
1042 * ctask timed out but session is OK requests must be serialized.
1043 */
1044 memset(hdr, 0, sizeof(struct iscsi_tm));
1045 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
1046 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK;
1047 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
1048 memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
1049 hdr->rtt = ctask->hdr->itt;
1050 hdr->refcmdsn = ctask->hdr->cmdsn;
1051
1052 rc = iscsi_conn_send_generic(conn, (struct iscsi_hdr *)hdr,
1053 NULL, 0);
1054 if (rc) {
1055 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1056 debug_scsi("abort sent failure [itt 0x%x] %d\n", ctask->itt,
1057 rc);
1058 return rc;
1059 }
1060
1061 debug_scsi("abort sent [itt 0x%x]\n", ctask->itt);
1062
1063 spin_lock_bh(&session->lock);
1064 ctask->mtask = (struct iscsi_mgmt_task *)
1065 session->mgmt_cmds[get_itt(hdr->itt) -
1066 ISCSI_MGMT_ITT_OFFSET];
1067
1068 if (conn->tmabort_state == TMABORT_INITIAL) {
1069 conn->tmfcmd_pdus_cnt++;
1070 conn->tmabort_timer.expires = 10*HZ + jiffies;
1071 conn->tmabort_timer.function = iscsi_tmabort_timedout;
1072 conn->tmabort_timer.data = (unsigned long)ctask;
1073 add_timer(&conn->tmabort_timer);
1074 debug_scsi("abort set timeout [itt 0x%x]\n", ctask->itt);
1075 }
1076 spin_unlock_bh(&session->lock);
1077 mutex_unlock(&conn->xmitmutex);
1078
1079 /*
1080 * block eh thread until:
1081 *
1082 * 1) abort response
1083 * 2) abort timeout
1084 * 3) session is terminated or restarted or userspace has
1085 * given up on recovery
1086 */
1087 wait_event_interruptible(conn->ehwait,
1088 sc->SCp.phase != session->age ||
1089 session->state != ISCSI_STATE_LOGGED_IN ||
1090 conn->tmabort_state != TMABORT_INITIAL);
1091 if (signal_pending(current))
1092 flush_signals(current);
1093 del_timer_sync(&conn->tmabort_timer);
1094
1095 mutex_lock(&conn->xmitmutex);
1096 return 0;
1097 }
1098
1099 /*
1100 * xmit mutex and session lock must be held
1101 */
1102 static struct iscsi_mgmt_task *
1103 iscsi_remove_mgmt_task(struct kfifo *fifo, uint32_t itt)
1104 {
1105 int i, nr_tasks = __kfifo_len(fifo) / sizeof(void*);
1106 struct iscsi_mgmt_task *task;
1107
1108 debug_scsi("searching %d tasks\n", nr_tasks);
1109
1110 for (i = 0; i < nr_tasks; i++) {
1111 __kfifo_get(fifo, (void*)&task, sizeof(void*));
1112 debug_scsi("check task %u\n", task->itt);
1113
1114 if (task->itt == itt) {
1115 debug_scsi("matched task\n");
1116 return task;
1117 }
1118
1119 __kfifo_put(fifo, (void*)&task, sizeof(void*));
1120 }
1121 return NULL;
1122 }
1123
1124 static int iscsi_ctask_mtask_cleanup(struct iscsi_cmd_task *ctask)
1125 {
1126 struct iscsi_conn *conn = ctask->conn;
1127 struct iscsi_session *session = conn->session;
1128
1129 if (!ctask->mtask)
1130 return -EINVAL;
1131
1132 if (!iscsi_remove_mgmt_task(conn->immqueue, ctask->mtask->itt))
1133 list_del(&ctask->mtask->running);
1134 __kfifo_put(session->mgmtpool.queue, (void*)&ctask->mtask,
1135 sizeof(void*));
1136 ctask->mtask = NULL;
1137 return 0;
1138 }
1139
1140 /*
1141 * session lock and xmitmutex must be held
1142 */
1143 static void fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
1144 int err)
1145 {
1146 struct scsi_cmnd *sc;
1147
1148 sc = ctask->sc;
1149 if (!sc)
1150 return;
1151
1152 conn->session->tt->cleanup_cmd_task(conn, ctask);
1153 iscsi_ctask_mtask_cleanup(ctask);
1154
1155 sc->result = err;
1156 sc->resid = sc->request_bufflen;
1157 /* release ref from queuecommand */
1158 __iscsi_put_ctask(ctask);
1159 }
1160
1161 int iscsi_eh_abort(struct scsi_cmnd *sc)
1162 {
1163 struct iscsi_cmd_task *ctask;
1164 struct iscsi_conn *conn;
1165 struct iscsi_session *session;
1166 int rc;
1167
1168 /*
1169 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
1170 * got the command.
1171 */
1172 if (!sc->SCp.ptr) {
1173 debug_scsi("sc never reached iscsi layer or it completed.\n");
1174 return SUCCESS;
1175 }
1176
1177 ctask = (struct iscsi_cmd_task *)sc->SCp.ptr;
1178 conn = ctask->conn;
1179 session = conn->session;
1180
1181 conn->eh_abort_cnt++;
1182 debug_scsi("aborting [sc %p itt 0x%x]\n", sc, ctask->itt);
1183
1184 mutex_lock(&conn->xmitmutex);
1185 spin_lock_bh(&session->lock);
1186
1187 /*
1188 * If we are not logged in or we have started a new session
1189 * then let the host reset code handle this
1190 */
1191 if (session->state != ISCSI_STATE_LOGGED_IN ||
1192 sc->SCp.phase != session->age)
1193 goto failed;
1194
1195 /* ctask completed before time out */
1196 if (!ctask->sc) {
1197 spin_unlock_bh(&session->lock);
1198 debug_scsi("sc completed while abort in progress\n");
1199 goto success_rel_mutex;
1200 }
1201
1202 /* what should we do here ? */
1203 if (conn->ctask == ctask) {
1204 printk(KERN_INFO "iscsi: sc %p itt 0x%x partially sent. "
1205 "Failing abort\n", sc, ctask->itt);
1206 goto failed;
1207 }
1208
1209 if (ctask->state == ISCSI_TASK_PENDING)
1210 goto success_cleanup;
1211
1212 conn->tmabort_state = TMABORT_INITIAL;
1213
1214 spin_unlock_bh(&session->lock);
1215 rc = iscsi_exec_abort_task(sc, ctask);
1216 spin_lock_bh(&session->lock);
1217
1218 if (rc || sc->SCp.phase != session->age ||
1219 session->state != ISCSI_STATE_LOGGED_IN)
1220 goto failed;
1221 iscsi_ctask_mtask_cleanup(ctask);
1222
1223 switch (conn->tmabort_state) {
1224 case TMABORT_SUCCESS:
1225 goto success_cleanup;
1226 case TMABORT_NOT_FOUND:
1227 if (!ctask->sc) {
1228 /* ctask completed before tmf abort response */
1229 spin_unlock_bh(&session->lock);
1230 debug_scsi("sc completed while abort in progress\n");
1231 goto success_rel_mutex;
1232 }
1233 /* fall through */
1234 default:
1235 /* timedout or failed */
1236 spin_unlock_bh(&session->lock);
1237 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1238 spin_lock_bh(&session->lock);
1239 goto failed;
1240 }
1241
1242 success_cleanup:
1243 debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
1244 spin_unlock_bh(&session->lock);
1245
1246 /*
1247 * clean up task if aborted. we have the xmitmutex so grab
1248 * the recv lock as a writer
1249 */
1250 write_lock_bh(conn->recv_lock);
1251 spin_lock(&session->lock);
1252 fail_command(conn, ctask, DID_ABORT << 16);
1253 spin_unlock(&session->lock);
1254 write_unlock_bh(conn->recv_lock);
1255
1256 success_rel_mutex:
1257 mutex_unlock(&conn->xmitmutex);
1258 return SUCCESS;
1259
1260 failed:
1261 spin_unlock_bh(&session->lock);
1262 mutex_unlock(&conn->xmitmutex);
1263
1264 debug_scsi("abort failed [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
1265 return FAILED;
1266 }
1267 EXPORT_SYMBOL_GPL(iscsi_eh_abort);
1268
1269 int
1270 iscsi_pool_init(struct iscsi_queue *q, int max, void ***items, int item_size)
1271 {
1272 int i;
1273
1274 *items = kmalloc(max * sizeof(void*), GFP_KERNEL);
1275 if (*items == NULL)
1276 return -ENOMEM;
1277
1278 q->max = max;
1279 q->pool = kmalloc(max * sizeof(void*), GFP_KERNEL);
1280 if (q->pool == NULL) {
1281 kfree(*items);
1282 return -ENOMEM;
1283 }
1284
1285 q->queue = kfifo_init((void*)q->pool, max * sizeof(void*),
1286 GFP_KERNEL, NULL);
1287 if (q->queue == ERR_PTR(-ENOMEM)) {
1288 kfree(q->pool);
1289 kfree(*items);
1290 return -ENOMEM;
1291 }
1292
1293 for (i = 0; i < max; i++) {
1294 q->pool[i] = kmalloc(item_size, GFP_KERNEL);
1295 if (q->pool[i] == NULL) {
1296 int j;
1297
1298 for (j = 0; j < i; j++)
1299 kfree(q->pool[j]);
1300
1301 kfifo_free(q->queue);
1302 kfree(q->pool);
1303 kfree(*items);
1304 return -ENOMEM;
1305 }
1306 memset(q->pool[i], 0, item_size);
1307 (*items)[i] = q->pool[i];
1308 __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*));
1309 }
1310 return 0;
1311 }
1312 EXPORT_SYMBOL_GPL(iscsi_pool_init);
1313
1314 void iscsi_pool_free(struct iscsi_queue *q, void **items)
1315 {
1316 int i;
1317
1318 for (i = 0; i < q->max; i++)
1319 kfree(items[i]);
1320 kfree(q->pool);
1321 kfree(items);
1322 }
1323 EXPORT_SYMBOL_GPL(iscsi_pool_free);
1324
1325 /*
1326 * iSCSI Session's hostdata organization:
1327 *
1328 * *------------------* <== hostdata_session(host->hostdata)
1329 * | ptr to class sess|
1330 * |------------------| <== iscsi_hostdata(host->hostdata)
1331 * | iscsi_session |
1332 * *------------------*
1333 */
1334
1335 #define hostdata_privsize(_sz) (sizeof(unsigned long) + _sz + \
1336 _sz % sizeof(unsigned long))
1337
1338 #define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata))
1339
1340 /**
1341 * iscsi_session_setup - create iscsi cls session and host and session
1342 * @scsit: scsi transport template
1343 * @iscsit: iscsi transport template
1344 * @initial_cmdsn: initial CmdSN
1345 * @hostno: host no allocated
1346 *
1347 * This can be used by software iscsi_transports that allocate
1348 * a session per scsi host.
1349 **/
1350 struct iscsi_cls_session *
1351 iscsi_session_setup(struct iscsi_transport *iscsit,
1352 struct scsi_transport_template *scsit,
1353 int cmd_task_size, int mgmt_task_size,
1354 uint32_t initial_cmdsn, uint32_t *hostno)
1355 {
1356 struct Scsi_Host *shost;
1357 struct iscsi_session *session;
1358 struct iscsi_cls_session *cls_session;
1359 int cmd_i;
1360
1361 shost = scsi_host_alloc(iscsit->host_template,
1362 hostdata_privsize(sizeof(*session)));
1363 if (!shost)
1364 return NULL;
1365
1366 shost->max_id = 1;
1367 shost->max_channel = 0;
1368 shost->max_lun = iscsit->max_lun;
1369 shost->max_cmd_len = iscsit->max_cmd_len;
1370 shost->transportt = scsit;
1371 shost->transportt->create_work_queue = 1;
1372 *hostno = shost->host_no;
1373
1374 session = iscsi_hostdata(shost->hostdata);
1375 memset(session, 0, sizeof(struct iscsi_session));
1376 session->host = shost;
1377 session->state = ISCSI_STATE_FREE;
1378 session->mgmtpool_max = ISCSI_MGMT_CMDS_MAX;
1379 session->cmds_max = ISCSI_XMIT_CMDS_MAX;
1380 session->cmdsn = initial_cmdsn;
1381 session->exp_cmdsn = initial_cmdsn + 1;
1382 session->max_cmdsn = initial_cmdsn + 1;
1383 session->max_r2t = 1;
1384 session->tt = iscsit;
1385
1386 /* initialize SCSI PDU commands pool */
1387 if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
1388 (void***)&session->cmds,
1389 cmd_task_size + sizeof(struct iscsi_cmd_task)))
1390 goto cmdpool_alloc_fail;
1391
1392 /* pre-format cmds pool with ITT */
1393 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
1394 struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
1395
1396 if (cmd_task_size)
1397 ctask->dd_data = &ctask[1];
1398 ctask->itt = cmd_i;
1399 INIT_LIST_HEAD(&ctask->running);
1400 }
1401
1402 spin_lock_init(&session->lock);
1403
1404 /* initialize immediate command pool */
1405 if (iscsi_pool_init(&session->mgmtpool, session->mgmtpool_max,
1406 (void***)&session->mgmt_cmds,
1407 mgmt_task_size + sizeof(struct iscsi_mgmt_task)))
1408 goto mgmtpool_alloc_fail;
1409
1410
1411 /* pre-format immediate cmds pool with ITT */
1412 for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) {
1413 struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i];
1414
1415 if (mgmt_task_size)
1416 mtask->dd_data = &mtask[1];
1417 mtask->itt = ISCSI_MGMT_ITT_OFFSET + cmd_i;
1418 INIT_LIST_HEAD(&mtask->running);
1419 }
1420
1421 if (scsi_add_host(shost, NULL))
1422 goto add_host_fail;
1423
1424 if (!try_module_get(iscsit->owner))
1425 goto cls_session_fail;
1426
1427 cls_session = iscsi_create_session(shost, iscsit, 0);
1428 if (!cls_session)
1429 goto module_put;
1430 *(unsigned long*)shost->hostdata = (unsigned long)cls_session;
1431
1432 return cls_session;
1433
1434 module_put:
1435 module_put(iscsit->owner);
1436 cls_session_fail:
1437 scsi_remove_host(shost);
1438 add_host_fail:
1439 iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
1440 mgmtpool_alloc_fail:
1441 iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
1442 cmdpool_alloc_fail:
1443 scsi_host_put(shost);
1444 return NULL;
1445 }
1446 EXPORT_SYMBOL_GPL(iscsi_session_setup);
1447
1448 /**
1449 * iscsi_session_teardown - destroy session, host, and cls_session
1450 * shost: scsi host
1451 *
1452 * This can be used by software iscsi_transports that allocate
1453 * a session per scsi host.
1454 **/
1455 void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
1456 {
1457 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
1458 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
1459 struct module *owner = cls_session->transport->owner;
1460
1461 scsi_remove_host(shost);
1462
1463 iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
1464 iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
1465
1466 kfree(session->targetname);
1467
1468 iscsi_destroy_session(cls_session);
1469 scsi_host_put(shost);
1470 module_put(owner);
1471 }
1472 EXPORT_SYMBOL_GPL(iscsi_session_teardown);
1473
1474 /**
1475 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
1476 * @cls_session: iscsi_cls_session
1477 * @conn_idx: cid
1478 **/
1479 struct iscsi_cls_conn *
1480 iscsi_conn_setup(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
1481 {
1482 struct iscsi_session *session = class_to_transport_session(cls_session);
1483 struct iscsi_conn *conn;
1484 struct iscsi_cls_conn *cls_conn;
1485 char *data;
1486
1487 cls_conn = iscsi_create_conn(cls_session, conn_idx);
1488 if (!cls_conn)
1489 return NULL;
1490 conn = cls_conn->dd_data;
1491 memset(conn, 0, sizeof(*conn));
1492
1493 conn->session = session;
1494 conn->cls_conn = cls_conn;
1495 conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
1496 conn->id = conn_idx;
1497 conn->exp_statsn = 0;
1498 conn->tmabort_state = TMABORT_INITIAL;
1499 INIT_LIST_HEAD(&conn->run_list);
1500 INIT_LIST_HEAD(&conn->mgmt_run_list);
1501 INIT_LIST_HEAD(&conn->xmitqueue);
1502
1503 /* initialize general immediate & non-immediate PDU commands queue */
1504 conn->immqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*),
1505 GFP_KERNEL, NULL);
1506 if (conn->immqueue == ERR_PTR(-ENOMEM))
1507 goto immqueue_alloc_fail;
1508
1509 conn->mgmtqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*),
1510 GFP_KERNEL, NULL);
1511 if (conn->mgmtqueue == ERR_PTR(-ENOMEM))
1512 goto mgmtqueue_alloc_fail;
1513
1514 INIT_WORK(&conn->xmitwork, iscsi_xmitworker);
1515
1516 /* allocate login_mtask used for the login/text sequences */
1517 spin_lock_bh(&session->lock);
1518 if (!__kfifo_get(session->mgmtpool.queue,
1519 (void*)&conn->login_mtask,
1520 sizeof(void*))) {
1521 spin_unlock_bh(&session->lock);
1522 goto login_mtask_alloc_fail;
1523 }
1524 spin_unlock_bh(&session->lock);
1525
1526 data = kmalloc(DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH, GFP_KERNEL);
1527 if (!data)
1528 goto login_mtask_data_alloc_fail;
1529 conn->login_mtask->data = conn->data = data;
1530
1531 init_timer(&conn->tmabort_timer);
1532 mutex_init(&conn->xmitmutex);
1533 init_waitqueue_head(&conn->ehwait);
1534
1535 return cls_conn;
1536
1537 login_mtask_data_alloc_fail:
1538 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
1539 sizeof(void*));
1540 login_mtask_alloc_fail:
1541 kfifo_free(conn->mgmtqueue);
1542 mgmtqueue_alloc_fail:
1543 kfifo_free(conn->immqueue);
1544 immqueue_alloc_fail:
1545 iscsi_destroy_conn(cls_conn);
1546 return NULL;
1547 }
1548 EXPORT_SYMBOL_GPL(iscsi_conn_setup);
1549
1550 /**
1551 * iscsi_conn_teardown - teardown iscsi connection
1552 * cls_conn: iscsi class connection
1553 *
1554 * TODO: we may need to make this into a two step process
1555 * like scsi-mls remove + put host
1556 */
1557 void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
1558 {
1559 struct iscsi_conn *conn = cls_conn->dd_data;
1560 struct iscsi_session *session = conn->session;
1561 unsigned long flags;
1562
1563 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1564 mutex_lock(&conn->xmitmutex);
1565
1566 spin_lock_bh(&session->lock);
1567 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
1568 if (session->leadconn == conn) {
1569 /*
1570 * leading connection? then give up on recovery.
1571 */
1572 session->state = ISCSI_STATE_TERMINATE;
1573 wake_up(&conn->ehwait);
1574 }
1575 spin_unlock_bh(&session->lock);
1576
1577 mutex_unlock(&conn->xmitmutex);
1578
1579 /*
1580 * Block until all in-progress commands for this connection
1581 * time out or fail.
1582 */
1583 for (;;) {
1584 spin_lock_irqsave(session->host->host_lock, flags);
1585 if (!session->host->host_busy) { /* OK for ERL == 0 */
1586 spin_unlock_irqrestore(session->host->host_lock, flags);
1587 break;
1588 }
1589 spin_unlock_irqrestore(session->host->host_lock, flags);
1590 msleep_interruptible(500);
1591 printk(KERN_INFO "iscsi: scsi conn_destroy(): host_busy %d "
1592 "host_failed %d\n", session->host->host_busy,
1593 session->host->host_failed);
1594 /*
1595 * force eh_abort() to unblock
1596 */
1597 wake_up(&conn->ehwait);
1598 }
1599
1600 spin_lock_bh(&session->lock);
1601 kfree(conn->data);
1602 kfree(conn->persistent_address);
1603 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
1604 sizeof(void*));
1605 if (session->leadconn == conn) {
1606 session->leadconn = NULL;
1607 /* no connections exits.. reset sequencing */
1608 session->cmdsn = session->max_cmdsn = session->exp_cmdsn = 1;
1609 }
1610 spin_unlock_bh(&session->lock);
1611
1612 kfifo_free(conn->immqueue);
1613 kfifo_free(conn->mgmtqueue);
1614
1615 iscsi_destroy_conn(cls_conn);
1616 }
1617 EXPORT_SYMBOL_GPL(iscsi_conn_teardown);
1618
1619 int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
1620 {
1621 struct iscsi_conn *conn = cls_conn->dd_data;
1622 struct iscsi_session *session = conn->session;
1623
1624 if (!session) {
1625 printk(KERN_ERR "iscsi: can't start unbound connection\n");
1626 return -EPERM;
1627 }
1628
1629 if ((session->imm_data_en || !session->initial_r2t_en) &&
1630 session->first_burst > session->max_burst) {
1631 printk("iscsi: invalid burst lengths: "
1632 "first_burst %d max_burst %d\n",
1633 session->first_burst, session->max_burst);
1634 return -EINVAL;
1635 }
1636
1637 spin_lock_bh(&session->lock);
1638 conn->c_stage = ISCSI_CONN_STARTED;
1639 session->state = ISCSI_STATE_LOGGED_IN;
1640
1641 switch(conn->stop_stage) {
1642 case STOP_CONN_RECOVER:
1643 /*
1644 * unblock eh_abort() if it is blocked. re-try all
1645 * commands after successful recovery
1646 */
1647 conn->stop_stage = 0;
1648 conn->tmabort_state = TMABORT_INITIAL;
1649 session->age++;
1650 spin_unlock_bh(&session->lock);
1651
1652 iscsi_unblock_session(session_to_cls(session));
1653 wake_up(&conn->ehwait);
1654 return 0;
1655 case STOP_CONN_TERM:
1656 conn->stop_stage = 0;
1657 break;
1658 default:
1659 break;
1660 }
1661 spin_unlock_bh(&session->lock);
1662
1663 return 0;
1664 }
1665 EXPORT_SYMBOL_GPL(iscsi_conn_start);
1666
1667 static void
1668 flush_control_queues(struct iscsi_session *session, struct iscsi_conn *conn)
1669 {
1670 struct iscsi_mgmt_task *mtask, *tmp;
1671
1672 /* handle pending */
1673 while (__kfifo_get(conn->immqueue, (void*)&mtask, sizeof(void*)) ||
1674 __kfifo_get(conn->mgmtqueue, (void*)&mtask, sizeof(void*))) {
1675 if (mtask == conn->login_mtask)
1676 continue;
1677 debug_scsi("flushing pending mgmt task itt 0x%x\n", mtask->itt);
1678 __kfifo_put(session->mgmtpool.queue, (void*)&mtask,
1679 sizeof(void*));
1680 }
1681
1682 /* handle running */
1683 list_for_each_entry_safe(mtask, tmp, &conn->mgmt_run_list, running) {
1684 debug_scsi("flushing running mgmt task itt 0x%x\n", mtask->itt);
1685 list_del(&mtask->running);
1686
1687 if (mtask == conn->login_mtask)
1688 continue;
1689 __kfifo_put(session->mgmtpool.queue, (void*)&mtask,
1690 sizeof(void*));
1691 }
1692
1693 conn->mtask = NULL;
1694 }
1695
1696 /* Fail commands. Mutex and session lock held and recv side suspended */
1697 static void fail_all_commands(struct iscsi_conn *conn)
1698 {
1699 struct iscsi_cmd_task *ctask, *tmp;
1700
1701 /* flush pending */
1702 list_for_each_entry_safe(ctask, tmp, &conn->xmitqueue, running) {
1703 debug_scsi("failing pending sc %p itt 0x%x\n", ctask->sc,
1704 ctask->itt);
1705 fail_command(conn, ctask, DID_BUS_BUSY << 16);
1706 }
1707
1708 /* fail all other running */
1709 list_for_each_entry_safe(ctask, tmp, &conn->run_list, running) {
1710 debug_scsi("failing in progress sc %p itt 0x%x\n",
1711 ctask->sc, ctask->itt);
1712 fail_command(conn, ctask, DID_BUS_BUSY << 16);
1713 }
1714
1715 conn->ctask = NULL;
1716 }
1717
1718 static void iscsi_start_session_recovery(struct iscsi_session *session,
1719 struct iscsi_conn *conn, int flag)
1720 {
1721 int old_stop_stage;
1722
1723 spin_lock_bh(&session->lock);
1724 if (conn->stop_stage == STOP_CONN_TERM) {
1725 spin_unlock_bh(&session->lock);
1726 return;
1727 }
1728
1729 /*
1730 * When this is called for the in_login state, we only want to clean
1731 * up the login task and connection. We do not need to block and set
1732 * the recovery state again
1733 */
1734 if (flag == STOP_CONN_TERM)
1735 session->state = ISCSI_STATE_TERMINATE;
1736 else if (conn->stop_stage != STOP_CONN_RECOVER)
1737 session->state = ISCSI_STATE_IN_RECOVERY;
1738
1739 old_stop_stage = conn->stop_stage;
1740 conn->stop_stage = flag;
1741 conn->c_stage = ISCSI_CONN_STOPPED;
1742 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1743 spin_unlock_bh(&session->lock);
1744
1745 write_lock_bh(conn->recv_lock);
1746 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
1747 write_unlock_bh(conn->recv_lock);
1748
1749 mutex_lock(&conn->xmitmutex);
1750 /*
1751 * for connection level recovery we should not calculate
1752 * header digest. conn->hdr_size used for optimization
1753 * in hdr_extract() and will be re-negotiated at
1754 * set_param() time.
1755 */
1756 if (flag == STOP_CONN_RECOVER) {
1757 conn->hdrdgst_en = 0;
1758 conn->datadgst_en = 0;
1759 if (session->state == ISCSI_STATE_IN_RECOVERY &&
1760 old_stop_stage != STOP_CONN_RECOVER) {
1761 debug_scsi("blocking session\n");
1762 iscsi_block_session(session_to_cls(session));
1763 }
1764 }
1765
1766 /*
1767 * flush queues.
1768 */
1769 spin_lock_bh(&session->lock);
1770 fail_all_commands(conn);
1771 flush_control_queues(session, conn);
1772 spin_unlock_bh(&session->lock);
1773
1774 mutex_unlock(&conn->xmitmutex);
1775 }
1776
1777 void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
1778 {
1779 struct iscsi_conn *conn = cls_conn->dd_data;
1780 struct iscsi_session *session = conn->session;
1781
1782 switch (flag) {
1783 case STOP_CONN_RECOVER:
1784 case STOP_CONN_TERM:
1785 iscsi_start_session_recovery(session, conn, flag);
1786 break;
1787 default:
1788 printk(KERN_ERR "iscsi: invalid stop flag %d\n", flag);
1789 }
1790 }
1791 EXPORT_SYMBOL_GPL(iscsi_conn_stop);
1792
1793 int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
1794 struct iscsi_cls_conn *cls_conn, int is_leading)
1795 {
1796 struct iscsi_session *session = class_to_transport_session(cls_session);
1797 struct iscsi_conn *conn = cls_conn->dd_data;
1798
1799 spin_lock_bh(&session->lock);
1800 if (is_leading)
1801 session->leadconn = conn;
1802 spin_unlock_bh(&session->lock);
1803
1804 /*
1805 * Unblock xmitworker(), Login Phase will pass through.
1806 */
1807 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
1808 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1809 return 0;
1810 }
1811 EXPORT_SYMBOL_GPL(iscsi_conn_bind);
1812
1813
1814 int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
1815 enum iscsi_param param, char *buf, int buflen)
1816 {
1817 struct iscsi_conn *conn = cls_conn->dd_data;
1818 struct iscsi_session *session = conn->session;
1819 uint32_t value;
1820
1821 switch(param) {
1822 case ISCSI_PARAM_MAX_RECV_DLENGTH:
1823 sscanf(buf, "%d", &conn->max_recv_dlength);
1824 break;
1825 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
1826 sscanf(buf, "%d", &conn->max_xmit_dlength);
1827 break;
1828 case ISCSI_PARAM_HDRDGST_EN:
1829 sscanf(buf, "%d", &conn->hdrdgst_en);
1830 break;
1831 case ISCSI_PARAM_DATADGST_EN:
1832 sscanf(buf, "%d", &conn->datadgst_en);
1833 break;
1834 case ISCSI_PARAM_INITIAL_R2T_EN:
1835 sscanf(buf, "%d", &session->initial_r2t_en);
1836 break;
1837 case ISCSI_PARAM_MAX_R2T:
1838 sscanf(buf, "%d", &session->max_r2t);
1839 break;
1840 case ISCSI_PARAM_IMM_DATA_EN:
1841 sscanf(buf, "%d", &session->imm_data_en);
1842 break;
1843 case ISCSI_PARAM_FIRST_BURST:
1844 sscanf(buf, "%d", &session->first_burst);
1845 break;
1846 case ISCSI_PARAM_MAX_BURST:
1847 sscanf(buf, "%d", &session->max_burst);
1848 break;
1849 case ISCSI_PARAM_PDU_INORDER_EN:
1850 sscanf(buf, "%d", &session->pdu_inorder_en);
1851 break;
1852 case ISCSI_PARAM_DATASEQ_INORDER_EN:
1853 sscanf(buf, "%d", &session->dataseq_inorder_en);
1854 break;
1855 case ISCSI_PARAM_ERL:
1856 sscanf(buf, "%d", &session->erl);
1857 break;
1858 case ISCSI_PARAM_IFMARKER_EN:
1859 sscanf(buf, "%d", &value);
1860 BUG_ON(value);
1861 break;
1862 case ISCSI_PARAM_OFMARKER_EN:
1863 sscanf(buf, "%d", &value);
1864 BUG_ON(value);
1865 break;
1866 case ISCSI_PARAM_EXP_STATSN:
1867 sscanf(buf, "%u", &conn->exp_statsn);
1868 break;
1869 case ISCSI_PARAM_TARGET_NAME:
1870 /* this should not change between logins */
1871 if (session->targetname)
1872 break;
1873
1874 session->targetname = kstrdup(buf, GFP_KERNEL);
1875 if (!session->targetname)
1876 return -ENOMEM;
1877 break;
1878 case ISCSI_PARAM_TPGT:
1879 sscanf(buf, "%d", &session->tpgt);
1880 break;
1881 case ISCSI_PARAM_PERSISTENT_PORT:
1882 sscanf(buf, "%d", &conn->persistent_port);
1883 break;
1884 case ISCSI_PARAM_PERSISTENT_ADDRESS:
1885 /*
1886 * this is the address returned in discovery so it should
1887 * not change between logins.
1888 */
1889 if (conn->persistent_address)
1890 break;
1891
1892 conn->persistent_address = kstrdup(buf, GFP_KERNEL);
1893 if (!conn->persistent_address)
1894 return -ENOMEM;
1895 break;
1896 default:
1897 return -ENOSYS;
1898 }
1899
1900 return 0;
1901 }
1902 EXPORT_SYMBOL_GPL(iscsi_set_param);
1903
1904 int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
1905 enum iscsi_param param, char *buf)
1906 {
1907 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
1908 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
1909 int len;
1910
1911 switch(param) {
1912 case ISCSI_PARAM_INITIAL_R2T_EN:
1913 len = sprintf(buf, "%d\n", session->initial_r2t_en);
1914 break;
1915 case ISCSI_PARAM_MAX_R2T:
1916 len = sprintf(buf, "%hu\n", session->max_r2t);
1917 break;
1918 case ISCSI_PARAM_IMM_DATA_EN:
1919 len = sprintf(buf, "%d\n", session->imm_data_en);
1920 break;
1921 case ISCSI_PARAM_FIRST_BURST:
1922 len = sprintf(buf, "%u\n", session->first_burst);
1923 break;
1924 case ISCSI_PARAM_MAX_BURST:
1925 len = sprintf(buf, "%u\n", session->max_burst);
1926 break;
1927 case ISCSI_PARAM_PDU_INORDER_EN:
1928 len = sprintf(buf, "%d\n", session->pdu_inorder_en);
1929 break;
1930 case ISCSI_PARAM_DATASEQ_INORDER_EN:
1931 len = sprintf(buf, "%d\n", session->dataseq_inorder_en);
1932 break;
1933 case ISCSI_PARAM_ERL:
1934 len = sprintf(buf, "%d\n", session->erl);
1935 break;
1936 case ISCSI_PARAM_TARGET_NAME:
1937 len = sprintf(buf, "%s\n", session->targetname);
1938 break;
1939 case ISCSI_PARAM_TPGT:
1940 len = sprintf(buf, "%d\n", session->tpgt);
1941 break;
1942 default:
1943 return -ENOSYS;
1944 }
1945
1946 return len;
1947 }
1948 EXPORT_SYMBOL_GPL(iscsi_session_get_param);
1949
1950 int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
1951 enum iscsi_param param, char *buf)
1952 {
1953 struct iscsi_conn *conn = cls_conn->dd_data;
1954 int len;
1955
1956 switch(param) {
1957 case ISCSI_PARAM_MAX_RECV_DLENGTH:
1958 len = sprintf(buf, "%u\n", conn->max_recv_dlength);
1959 break;
1960 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
1961 len = sprintf(buf, "%u\n", conn->max_xmit_dlength);
1962 break;
1963 case ISCSI_PARAM_HDRDGST_EN:
1964 len = sprintf(buf, "%d\n", conn->hdrdgst_en);
1965 break;
1966 case ISCSI_PARAM_DATADGST_EN:
1967 len = sprintf(buf, "%d\n", conn->datadgst_en);
1968 break;
1969 case ISCSI_PARAM_IFMARKER_EN:
1970 len = sprintf(buf, "%d\n", conn->ifmarker_en);
1971 break;
1972 case ISCSI_PARAM_OFMARKER_EN:
1973 len = sprintf(buf, "%d\n", conn->ofmarker_en);
1974 break;
1975 case ISCSI_PARAM_EXP_STATSN:
1976 len = sprintf(buf, "%u\n", conn->exp_statsn);
1977 break;
1978 case ISCSI_PARAM_PERSISTENT_PORT:
1979 len = sprintf(buf, "%d\n", conn->persistent_port);
1980 break;
1981 case ISCSI_PARAM_PERSISTENT_ADDRESS:
1982 len = sprintf(buf, "%s\n", conn->persistent_address);
1983 break;
1984 default:
1985 return -ENOSYS;
1986 }
1987
1988 return len;
1989 }
1990 EXPORT_SYMBOL_GPL(iscsi_conn_get_param);
1991
1992 MODULE_AUTHOR("Mike Christie");
1993 MODULE_DESCRIPTION("iSCSI library functions");
1994 MODULE_LICENSE("GPL");
kernel-based virtual machine