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[SCSI] iscsi transport: use atomic for session_nr allocations
[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/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_mtask(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 /* done with this in-progress mtask */
595 conn->mtask = NULL;
596
597 if (was_logout) {
598 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
599 return -ENODATA;
600 }
601 return 0;
602 }
603
604 /**
605 * iscsi_data_xmit - xmit any command into the scheduled connection
606 * @conn: iscsi connection
607 *
608 * Notes:
609 * The function can return -EAGAIN in which case the caller must
610 * re-schedule it again later or recover. '0' return code means
611 * successful xmit.
612 **/
613 static int iscsi_data_xmit(struct iscsi_conn *conn)
614 {
615 struct iscsi_transport *tt;
616 int rc = 0;
617
618 if (unlikely(conn->suspend_tx)) {
619 debug_scsi("conn %d Tx suspended!\n", conn->id);
620 return -ENODATA;
621 }
622 tt = conn->session->tt;
623
624 /*
625 * Transmit in the following order:
626 *
627 * 1) un-finished xmit (ctask or mtask)
628 * 2) immediate control PDUs
629 * 3) write data
630 * 4) SCSI commands
631 * 5) non-immediate control PDUs
632 *
633 * No need to lock around __kfifo_get as long as
634 * there's one producer and one consumer.
635 */
636
637 BUG_ON(conn->ctask && conn->mtask);
638
639 if (conn->ctask) {
640 iscsi_get_ctask(conn->ctask);
641 rc = tt->xmit_cmd_task(conn, conn->ctask);
642 iscsi_put_ctask(conn->ctask);
643 if (rc)
644 goto again;
645 /* done with this in-progress ctask */
646 conn->ctask = NULL;
647 }
648 if (conn->mtask) {
649 rc = iscsi_xmit_mtask(conn);
650 if (rc)
651 goto again;
652 }
653
654 /* process immediate first */
655 if (unlikely(__kfifo_len(conn->immqueue))) {
656 while (__kfifo_get(conn->immqueue, (void*)&conn->mtask,
657 sizeof(void*))) {
658 spin_lock_bh(&conn->session->lock);
659 list_add_tail(&conn->mtask->running,
660 &conn->mgmt_run_list);
661 spin_unlock_bh(&conn->session->lock);
662 rc = iscsi_xmit_mtask(conn);
663 if (rc)
664 goto again;
665 }
666 }
667
668 /* process command queue */
669 spin_lock_bh(&conn->session->lock);
670 while (!list_empty(&conn->xmitqueue)) {
671 /*
672 * iscsi tcp may readd the task to the xmitqueue to send
673 * write data
674 */
675 conn->ctask = list_entry(conn->xmitqueue.next,
676 struct iscsi_cmd_task, running);
677 conn->ctask->state = ISCSI_TASK_RUNNING;
678 list_move_tail(conn->xmitqueue.next, &conn->run_list);
679 __iscsi_get_ctask(conn->ctask);
680 spin_unlock_bh(&conn->session->lock);
681
682 rc = tt->xmit_cmd_task(conn, conn->ctask);
683
684 spin_lock_bh(&conn->session->lock);
685 __iscsi_put_ctask(conn->ctask);
686 if (rc) {
687 spin_unlock_bh(&conn->session->lock);
688 goto again;
689 }
690 }
691 spin_unlock_bh(&conn->session->lock);
692 /* done with this ctask */
693 conn->ctask = NULL;
694
695 /* process the rest control plane PDUs, if any */
696 if (unlikely(__kfifo_len(conn->mgmtqueue))) {
697 while (__kfifo_get(conn->mgmtqueue, (void*)&conn->mtask,
698 sizeof(void*))) {
699 spin_lock_bh(&conn->session->lock);
700 list_add_tail(&conn->mtask->running,
701 &conn->mgmt_run_list);
702 spin_unlock_bh(&conn->session->lock);
703 rc = iscsi_xmit_mtask(conn);
704 if (rc)
705 goto again;
706 }
707 }
708
709 return -ENODATA;
710
711 again:
712 if (unlikely(conn->suspend_tx))
713 return -ENODATA;
714
715 return rc;
716 }
717
718 static void iscsi_xmitworker(struct work_struct *work)
719 {
720 struct iscsi_conn *conn =
721 container_of(work, struct iscsi_conn, xmitwork);
722 int rc;
723 /*
724 * serialize Xmit worker on a per-connection basis.
725 */
726 mutex_lock(&conn->xmitmutex);
727 do {
728 rc = iscsi_data_xmit(conn);
729 } while (rc >= 0 || rc == -EAGAIN);
730 mutex_unlock(&conn->xmitmutex);
731 }
732
733 enum {
734 FAILURE_BAD_HOST = 1,
735 FAILURE_SESSION_FAILED,
736 FAILURE_SESSION_FREED,
737 FAILURE_WINDOW_CLOSED,
738 FAILURE_OOM,
739 FAILURE_SESSION_TERMINATE,
740 FAILURE_SESSION_IN_RECOVERY,
741 FAILURE_SESSION_RECOVERY_TIMEOUT,
742 };
743
744 int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
745 {
746 struct Scsi_Host *host;
747 int reason = 0;
748 struct iscsi_session *session;
749 struct iscsi_conn *conn;
750 struct iscsi_cmd_task *ctask = NULL;
751
752 sc->scsi_done = done;
753 sc->result = 0;
754 sc->SCp.ptr = NULL;
755
756 host = sc->device->host;
757 session = iscsi_hostdata(host->hostdata);
758
759 spin_lock(&session->lock);
760
761 /*
762 * ISCSI_STATE_FAILED is a temp. state. The recovery
763 * code will decide what is best to do with command queued
764 * during this time
765 */
766 if (session->state != ISCSI_STATE_LOGGED_IN &&
767 session->state != ISCSI_STATE_FAILED) {
768 /*
769 * to handle the race between when we set the recovery state
770 * and block the session we requeue here (commands could
771 * be entering our queuecommand while a block is starting
772 * up because the block code is not locked)
773 */
774 if (session->state == ISCSI_STATE_IN_RECOVERY) {
775 reason = FAILURE_SESSION_IN_RECOVERY;
776 goto reject;
777 }
778
779 if (session->state == ISCSI_STATE_RECOVERY_FAILED)
780 reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
781 else if (session->state == ISCSI_STATE_TERMINATE)
782 reason = FAILURE_SESSION_TERMINATE;
783 else
784 reason = FAILURE_SESSION_FREED;
785 goto fault;
786 }
787
788 /*
789 * Check for iSCSI window and take care of CmdSN wrap-around
790 */
791 if ((int)(session->max_cmdsn - session->cmdsn) < 0) {
792 reason = FAILURE_WINDOW_CLOSED;
793 goto reject;
794 }
795
796 conn = session->leadconn;
797 if (!conn) {
798 reason = FAILURE_SESSION_FREED;
799 goto fault;
800 }
801
802 if (!__kfifo_get(session->cmdpool.queue, (void*)&ctask,
803 sizeof(void*))) {
804 reason = FAILURE_OOM;
805 goto reject;
806 }
807 sc->SCp.phase = session->age;
808 sc->SCp.ptr = (char *)ctask;
809
810 atomic_set(&ctask->refcount, 1);
811 ctask->state = ISCSI_TASK_PENDING;
812 ctask->mtask = NULL;
813 ctask->conn = conn;
814 ctask->sc = sc;
815 INIT_LIST_HEAD(&ctask->running);
816 ctask->total_length = sc->request_bufflen;
817 iscsi_prep_scsi_cmd_pdu(ctask);
818
819 session->tt->init_cmd_task(ctask);
820
821 list_add_tail(&ctask->running, &conn->xmitqueue);
822 debug_scsi(
823 "ctask enq [%s cid %d sc %p cdb 0x%x itt 0x%x len %d cmdsn %d "
824 "win %d]\n",
825 sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read",
826 conn->id, sc, sc->cmnd[0], ctask->itt, sc->request_bufflen,
827 session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1);
828 spin_unlock(&session->lock);
829
830 scsi_queue_work(host, &conn->xmitwork);
831 return 0;
832
833 reject:
834 spin_unlock(&session->lock);
835 debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason);
836 return SCSI_MLQUEUE_HOST_BUSY;
837
838 fault:
839 spin_unlock(&session->lock);
840 printk(KERN_ERR "iscsi: cmd 0x%x is not queued (%d)\n",
841 sc->cmnd[0], reason);
842 sc->result = (DID_NO_CONNECT << 16);
843 sc->resid = sc->request_bufflen;
844 sc->scsi_done(sc);
845 return 0;
846 }
847 EXPORT_SYMBOL_GPL(iscsi_queuecommand);
848
849 int iscsi_change_queue_depth(struct scsi_device *sdev, int depth)
850 {
851 if (depth > ISCSI_MAX_CMD_PER_LUN)
852 depth = ISCSI_MAX_CMD_PER_LUN;
853 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
854 return sdev->queue_depth;
855 }
856 EXPORT_SYMBOL_GPL(iscsi_change_queue_depth);
857
858 static int
859 iscsi_conn_send_generic(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
860 char *data, uint32_t data_size)
861 {
862 struct iscsi_session *session = conn->session;
863 struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
864 struct iscsi_mgmt_task *mtask;
865
866 spin_lock_bh(&session->lock);
867 if (session->state == ISCSI_STATE_TERMINATE) {
868 spin_unlock_bh(&session->lock);
869 return -EPERM;
870 }
871 if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) ||
872 hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
873 /*
874 * Login and Text are sent serially, in
875 * request-followed-by-response sequence.
876 * Same mtask can be used. Same ITT must be used.
877 * Note that login_mtask is preallocated at conn_create().
878 */
879 mtask = conn->login_mtask;
880 else {
881 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
882 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
883
884 nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
885 if (!__kfifo_get(session->mgmtpool.queue,
886 (void*)&mtask, sizeof(void*))) {
887 spin_unlock_bh(&session->lock);
888 return -ENOSPC;
889 }
890 }
891
892 /*
893 * pre-format CmdSN for outgoing PDU.
894 */
895 if (hdr->itt != RESERVED_ITT) {
896 hdr->itt = build_itt(mtask->itt, conn->id, session->age);
897 nop->cmdsn = cpu_to_be32(session->cmdsn);
898 if (conn->c_stage == ISCSI_CONN_STARTED &&
899 !(hdr->opcode & ISCSI_OP_IMMEDIATE))
900 session->cmdsn++;
901 } else
902 /* do not advance CmdSN */
903 nop->cmdsn = cpu_to_be32(session->cmdsn);
904
905 if (data_size) {
906 memcpy(mtask->data, data, data_size);
907 mtask->data_count = data_size;
908 } else
909 mtask->data_count = 0;
910
911 INIT_LIST_HEAD(&mtask->running);
912 memcpy(mtask->hdr, hdr, sizeof(struct iscsi_hdr));
913 if (session->tt->init_mgmt_task)
914 session->tt->init_mgmt_task(conn, mtask, data, data_size);
915 spin_unlock_bh(&session->lock);
916
917 debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n",
918 hdr->opcode, hdr->itt, data_size);
919
920 /*
921 * since send_pdu() could be called at least from two contexts,
922 * we need to serialize __kfifo_put, so we don't have to take
923 * additional lock on fast data-path
924 */
925 if (hdr->opcode & ISCSI_OP_IMMEDIATE)
926 __kfifo_put(conn->immqueue, (void*)&mtask, sizeof(void*));
927 else
928 __kfifo_put(conn->mgmtqueue, (void*)&mtask, sizeof(void*));
929
930 scsi_queue_work(session->host, &conn->xmitwork);
931 return 0;
932 }
933
934 int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr,
935 char *data, uint32_t data_size)
936 {
937 struct iscsi_conn *conn = cls_conn->dd_data;
938 int rc;
939
940 mutex_lock(&conn->xmitmutex);
941 rc = iscsi_conn_send_generic(conn, hdr, data, data_size);
942 mutex_unlock(&conn->xmitmutex);
943
944 return rc;
945 }
946 EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu);
947
948 void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
949 {
950 struct iscsi_session *session = class_to_transport_session(cls_session);
951 struct iscsi_conn *conn = session->leadconn;
952
953 spin_lock_bh(&session->lock);
954 if (session->state != ISCSI_STATE_LOGGED_IN) {
955 session->state = ISCSI_STATE_RECOVERY_FAILED;
956 if (conn)
957 wake_up(&conn->ehwait);
958 }
959 spin_unlock_bh(&session->lock);
960 }
961 EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
962
963 int iscsi_eh_host_reset(struct scsi_cmnd *sc)
964 {
965 struct Scsi_Host *host = sc->device->host;
966 struct iscsi_session *session = iscsi_hostdata(host->hostdata);
967 struct iscsi_conn *conn = session->leadconn;
968 int fail_session = 0;
969
970 spin_lock_bh(&session->lock);
971 if (session->state == ISCSI_STATE_TERMINATE) {
972 failed:
973 debug_scsi("failing host reset: session terminated "
974 "[CID %d age %d]\n", conn->id, session->age);
975 spin_unlock_bh(&session->lock);
976 return FAILED;
977 }
978
979 if (sc->SCp.phase == session->age) {
980 debug_scsi("failing connection CID %d due to SCSI host reset\n",
981 conn->id);
982 fail_session = 1;
983 }
984 spin_unlock_bh(&session->lock);
985
986 /*
987 * we drop the lock here but the leadconn cannot be destoyed while
988 * we are in the scsi eh
989 */
990 if (fail_session)
991 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
992
993 debug_scsi("iscsi_eh_host_reset wait for relogin\n");
994 wait_event_interruptible(conn->ehwait,
995 session->state == ISCSI_STATE_TERMINATE ||
996 session->state == ISCSI_STATE_LOGGED_IN ||
997 session->state == ISCSI_STATE_RECOVERY_FAILED);
998 if (signal_pending(current))
999 flush_signals(current);
1000
1001 spin_lock_bh(&session->lock);
1002 if (session->state == ISCSI_STATE_LOGGED_IN)
1003 printk(KERN_INFO "iscsi: host reset succeeded\n");
1004 else
1005 goto failed;
1006 spin_unlock_bh(&session->lock);
1007
1008 return SUCCESS;
1009 }
1010 EXPORT_SYMBOL_GPL(iscsi_eh_host_reset);
1011
1012 static void iscsi_tmabort_timedout(unsigned long data)
1013 {
1014 struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)data;
1015 struct iscsi_conn *conn = ctask->conn;
1016 struct iscsi_session *session = conn->session;
1017
1018 spin_lock(&session->lock);
1019 if (conn->tmabort_state == TMABORT_INITIAL) {
1020 conn->tmabort_state = TMABORT_TIMEDOUT;
1021 debug_scsi("tmabort timedout [sc %p itt 0x%x]\n",
1022 ctask->sc, ctask->itt);
1023 /* unblock eh_abort() */
1024 wake_up(&conn->ehwait);
1025 }
1026 spin_unlock(&session->lock);
1027 }
1028
1029 /* must be called with the mutex lock */
1030 static int iscsi_exec_abort_task(struct scsi_cmnd *sc,
1031 struct iscsi_cmd_task *ctask)
1032 {
1033 struct iscsi_conn *conn = ctask->conn;
1034 struct iscsi_session *session = conn->session;
1035 struct iscsi_tm *hdr = &conn->tmhdr;
1036 int rc;
1037
1038 /*
1039 * ctask timed out but session is OK requests must be serialized.
1040 */
1041 memset(hdr, 0, sizeof(struct iscsi_tm));
1042 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
1043 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK;
1044 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
1045 memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
1046 hdr->rtt = ctask->hdr->itt;
1047 hdr->refcmdsn = ctask->hdr->cmdsn;
1048
1049 rc = iscsi_conn_send_generic(conn, (struct iscsi_hdr *)hdr,
1050 NULL, 0);
1051 if (rc) {
1052 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1053 debug_scsi("abort sent failure [itt 0x%x] %d\n", ctask->itt,
1054 rc);
1055 return rc;
1056 }
1057
1058 debug_scsi("abort sent [itt 0x%x]\n", ctask->itt);
1059
1060 spin_lock_bh(&session->lock);
1061 ctask->mtask = (struct iscsi_mgmt_task *)
1062 session->mgmt_cmds[get_itt(hdr->itt) -
1063 ISCSI_MGMT_ITT_OFFSET];
1064
1065 if (conn->tmabort_state == TMABORT_INITIAL) {
1066 conn->tmfcmd_pdus_cnt++;
1067 conn->tmabort_timer.expires = 10*HZ + jiffies;
1068 conn->tmabort_timer.function = iscsi_tmabort_timedout;
1069 conn->tmabort_timer.data = (unsigned long)ctask;
1070 add_timer(&conn->tmabort_timer);
1071 debug_scsi("abort set timeout [itt 0x%x]\n", ctask->itt);
1072 }
1073 spin_unlock_bh(&session->lock);
1074 mutex_unlock(&conn->xmitmutex);
1075
1076 /*
1077 * block eh thread until:
1078 *
1079 * 1) abort response
1080 * 2) abort timeout
1081 * 3) session is terminated or restarted or userspace has
1082 * given up on recovery
1083 */
1084 wait_event_interruptible(conn->ehwait,
1085 sc->SCp.phase != session->age ||
1086 session->state != ISCSI_STATE_LOGGED_IN ||
1087 conn->tmabort_state != TMABORT_INITIAL);
1088 if (signal_pending(current))
1089 flush_signals(current);
1090 del_timer_sync(&conn->tmabort_timer);
1091
1092 mutex_lock(&conn->xmitmutex);
1093 return 0;
1094 }
1095
1096 /*
1097 * xmit mutex and session lock must be held
1098 */
1099 static struct iscsi_mgmt_task *
1100 iscsi_remove_mgmt_task(struct kfifo *fifo, uint32_t itt)
1101 {
1102 int i, nr_tasks = __kfifo_len(fifo) / sizeof(void*);
1103 struct iscsi_mgmt_task *task;
1104
1105 debug_scsi("searching %d tasks\n", nr_tasks);
1106
1107 for (i = 0; i < nr_tasks; i++) {
1108 __kfifo_get(fifo, (void*)&task, sizeof(void*));
1109 debug_scsi("check task %u\n", task->itt);
1110
1111 if (task->itt == itt) {
1112 debug_scsi("matched task\n");
1113 return task;
1114 }
1115
1116 __kfifo_put(fifo, (void*)&task, sizeof(void*));
1117 }
1118 return NULL;
1119 }
1120
1121 static int iscsi_ctask_mtask_cleanup(struct iscsi_cmd_task *ctask)
1122 {
1123 struct iscsi_conn *conn = ctask->conn;
1124 struct iscsi_session *session = conn->session;
1125
1126 if (!ctask->mtask)
1127 return -EINVAL;
1128
1129 if (!iscsi_remove_mgmt_task(conn->immqueue, ctask->mtask->itt))
1130 list_del(&ctask->mtask->running);
1131 __kfifo_put(session->mgmtpool.queue, (void*)&ctask->mtask,
1132 sizeof(void*));
1133 ctask->mtask = NULL;
1134 return 0;
1135 }
1136
1137 /*
1138 * session lock and xmitmutex must be held
1139 */
1140 static void fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
1141 int err)
1142 {
1143 struct scsi_cmnd *sc;
1144
1145 sc = ctask->sc;
1146 if (!sc)
1147 return;
1148
1149 conn->session->tt->cleanup_cmd_task(conn, ctask);
1150 iscsi_ctask_mtask_cleanup(ctask);
1151
1152 sc->result = err;
1153 sc->resid = sc->request_bufflen;
1154 /* release ref from queuecommand */
1155 __iscsi_put_ctask(ctask);
1156 }
1157
1158 int iscsi_eh_abort(struct scsi_cmnd *sc)
1159 {
1160 struct iscsi_cmd_task *ctask;
1161 struct iscsi_conn *conn;
1162 struct iscsi_session *session;
1163 int rc;
1164
1165 /*
1166 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
1167 * got the command.
1168 */
1169 if (!sc->SCp.ptr) {
1170 debug_scsi("sc never reached iscsi layer or it completed.\n");
1171 return SUCCESS;
1172 }
1173
1174 ctask = (struct iscsi_cmd_task *)sc->SCp.ptr;
1175 conn = ctask->conn;
1176 session = conn->session;
1177
1178 conn->eh_abort_cnt++;
1179 debug_scsi("aborting [sc %p itt 0x%x]\n", sc, ctask->itt);
1180
1181 mutex_lock(&conn->xmitmutex);
1182 spin_lock_bh(&session->lock);
1183
1184 /*
1185 * If we are not logged in or we have started a new session
1186 * then let the host reset code handle this
1187 */
1188 if (session->state != ISCSI_STATE_LOGGED_IN ||
1189 sc->SCp.phase != session->age)
1190 goto failed;
1191
1192 /* ctask completed before time out */
1193 if (!ctask->sc) {
1194 spin_unlock_bh(&session->lock);
1195 debug_scsi("sc completed while abort in progress\n");
1196 goto success_rel_mutex;
1197 }
1198
1199 /* what should we do here ? */
1200 if (conn->ctask == ctask) {
1201 printk(KERN_INFO "iscsi: sc %p itt 0x%x partially sent. "
1202 "Failing abort\n", sc, ctask->itt);
1203 goto failed;
1204 }
1205
1206 if (ctask->state == ISCSI_TASK_PENDING)
1207 goto success_cleanup;
1208
1209 conn->tmabort_state = TMABORT_INITIAL;
1210
1211 spin_unlock_bh(&session->lock);
1212 rc = iscsi_exec_abort_task(sc, ctask);
1213 spin_lock_bh(&session->lock);
1214
1215 if (rc || sc->SCp.phase != session->age ||
1216 session->state != ISCSI_STATE_LOGGED_IN)
1217 goto failed;
1218 iscsi_ctask_mtask_cleanup(ctask);
1219
1220 switch (conn->tmabort_state) {
1221 case TMABORT_SUCCESS:
1222 goto success_cleanup;
1223 case TMABORT_NOT_FOUND:
1224 if (!ctask->sc) {
1225 /* ctask completed before tmf abort response */
1226 spin_unlock_bh(&session->lock);
1227 debug_scsi("sc completed while abort in progress\n");
1228 goto success_rel_mutex;
1229 }
1230 /* fall through */
1231 default:
1232 /* timedout or failed */
1233 spin_unlock_bh(&session->lock);
1234 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1235 spin_lock_bh(&session->lock);
1236 goto failed;
1237 }
1238
1239 success_cleanup:
1240 debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
1241 spin_unlock_bh(&session->lock);
1242
1243 /*
1244 * clean up task if aborted. we have the xmitmutex so grab
1245 * the recv lock as a writer
1246 */
1247 write_lock_bh(conn->recv_lock);
1248 spin_lock(&session->lock);
1249 fail_command(conn, ctask, DID_ABORT << 16);
1250 spin_unlock(&session->lock);
1251 write_unlock_bh(conn->recv_lock);
1252
1253 success_rel_mutex:
1254 mutex_unlock(&conn->xmitmutex);
1255 return SUCCESS;
1256
1257 failed:
1258 spin_unlock_bh(&session->lock);
1259 mutex_unlock(&conn->xmitmutex);
1260
1261 debug_scsi("abort failed [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
1262 return FAILED;
1263 }
1264 EXPORT_SYMBOL_GPL(iscsi_eh_abort);
1265
1266 int
1267 iscsi_pool_init(struct iscsi_queue *q, int max, void ***items, int item_size)
1268 {
1269 int i;
1270
1271 *items = kmalloc(max * sizeof(void*), GFP_KERNEL);
1272 if (*items == NULL)
1273 return -ENOMEM;
1274
1275 q->max = max;
1276 q->pool = kmalloc(max * sizeof(void*), GFP_KERNEL);
1277 if (q->pool == NULL) {
1278 kfree(*items);
1279 return -ENOMEM;
1280 }
1281
1282 q->queue = kfifo_init((void*)q->pool, max * sizeof(void*),
1283 GFP_KERNEL, NULL);
1284 if (q->queue == ERR_PTR(-ENOMEM)) {
1285 kfree(q->pool);
1286 kfree(*items);
1287 return -ENOMEM;
1288 }
1289
1290 for (i = 0; i < max; i++) {
1291 q->pool[i] = kmalloc(item_size, GFP_KERNEL);
1292 if (q->pool[i] == NULL) {
1293 int j;
1294
1295 for (j = 0; j < i; j++)
1296 kfree(q->pool[j]);
1297
1298 kfifo_free(q->queue);
1299 kfree(q->pool);
1300 kfree(*items);
1301 return -ENOMEM;
1302 }
1303 memset(q->pool[i], 0, item_size);
1304 (*items)[i] = q->pool[i];
1305 __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*));
1306 }
1307 return 0;
1308 }
1309 EXPORT_SYMBOL_GPL(iscsi_pool_init);
1310
1311 void iscsi_pool_free(struct iscsi_queue *q, void **items)
1312 {
1313 int i;
1314
1315 for (i = 0; i < q->max; i++)
1316 kfree(items[i]);
1317 kfree(q->pool);
1318 kfree(items);
1319 }
1320 EXPORT_SYMBOL_GPL(iscsi_pool_free);
1321
1322 /*
1323 * iSCSI Session's hostdata organization:
1324 *
1325 * *------------------* <== hostdata_session(host->hostdata)
1326 * | ptr to class sess|
1327 * |------------------| <== iscsi_hostdata(host->hostdata)
1328 * | iscsi_session |
1329 * *------------------*
1330 */
1331
1332 #define hostdata_privsize(_sz) (sizeof(unsigned long) + _sz + \
1333 _sz % sizeof(unsigned long))
1334
1335 #define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata))
1336
1337 /**
1338 * iscsi_session_setup - create iscsi cls session and host and session
1339 * @scsit: scsi transport template
1340 * @iscsit: iscsi transport template
1341 * @initial_cmdsn: initial CmdSN
1342 * @hostno: host no allocated
1343 *
1344 * This can be used by software iscsi_transports that allocate
1345 * a session per scsi host.
1346 **/
1347 struct iscsi_cls_session *
1348 iscsi_session_setup(struct iscsi_transport *iscsit,
1349 struct scsi_transport_template *scsit,
1350 int cmd_task_size, int mgmt_task_size,
1351 uint32_t initial_cmdsn, uint32_t *hostno)
1352 {
1353 struct Scsi_Host *shost;
1354 struct iscsi_session *session;
1355 struct iscsi_cls_session *cls_session;
1356 int cmd_i;
1357
1358 shost = scsi_host_alloc(iscsit->host_template,
1359 hostdata_privsize(sizeof(*session)));
1360 if (!shost)
1361 return NULL;
1362
1363 shost->max_id = 1;
1364 shost->max_channel = 0;
1365 shost->max_lun = iscsit->max_lun;
1366 shost->max_cmd_len = iscsit->max_cmd_len;
1367 shost->transportt = scsit;
1368 shost->transportt->create_work_queue = 1;
1369 *hostno = shost->host_no;
1370
1371 session = iscsi_hostdata(shost->hostdata);
1372 memset(session, 0, sizeof(struct iscsi_session));
1373 session->host = shost;
1374 session->state = ISCSI_STATE_FREE;
1375 session->mgmtpool_max = ISCSI_MGMT_CMDS_MAX;
1376 session->cmds_max = ISCSI_XMIT_CMDS_MAX;
1377 session->cmdsn = initial_cmdsn;
1378 session->exp_cmdsn = initial_cmdsn + 1;
1379 session->max_cmdsn = initial_cmdsn + 1;
1380 session->max_r2t = 1;
1381 session->tt = iscsit;
1382
1383 /* initialize SCSI PDU commands pool */
1384 if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
1385 (void***)&session->cmds,
1386 cmd_task_size + sizeof(struct iscsi_cmd_task)))
1387 goto cmdpool_alloc_fail;
1388
1389 /* pre-format cmds pool with ITT */
1390 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
1391 struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
1392
1393 if (cmd_task_size)
1394 ctask->dd_data = &ctask[1];
1395 ctask->itt = cmd_i;
1396 INIT_LIST_HEAD(&ctask->running);
1397 }
1398
1399 spin_lock_init(&session->lock);
1400
1401 /* initialize immediate command pool */
1402 if (iscsi_pool_init(&session->mgmtpool, session->mgmtpool_max,
1403 (void***)&session->mgmt_cmds,
1404 mgmt_task_size + sizeof(struct iscsi_mgmt_task)))
1405 goto mgmtpool_alloc_fail;
1406
1407
1408 /* pre-format immediate cmds pool with ITT */
1409 for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) {
1410 struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i];
1411
1412 if (mgmt_task_size)
1413 mtask->dd_data = &mtask[1];
1414 mtask->itt = ISCSI_MGMT_ITT_OFFSET + cmd_i;
1415 INIT_LIST_HEAD(&mtask->running);
1416 }
1417
1418 if (scsi_add_host(shost, NULL))
1419 goto add_host_fail;
1420
1421 if (!try_module_get(iscsit->owner))
1422 goto cls_session_fail;
1423
1424 cls_session = iscsi_create_session(shost, iscsit, 0);
1425 if (!cls_session)
1426 goto module_put;
1427 *(unsigned long*)shost->hostdata = (unsigned long)cls_session;
1428
1429 return cls_session;
1430
1431 module_put:
1432 module_put(iscsit->owner);
1433 cls_session_fail:
1434 scsi_remove_host(shost);
1435 add_host_fail:
1436 iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
1437 mgmtpool_alloc_fail:
1438 iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
1439 cmdpool_alloc_fail:
1440 scsi_host_put(shost);
1441 return NULL;
1442 }
1443 EXPORT_SYMBOL_GPL(iscsi_session_setup);
1444
1445 /**
1446 * iscsi_session_teardown - destroy session, host, and cls_session
1447 * shost: scsi host
1448 *
1449 * This can be used by software iscsi_transports that allocate
1450 * a session per scsi host.
1451 **/
1452 void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
1453 {
1454 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
1455 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
1456 struct module *owner = cls_session->transport->owner;
1457
1458 scsi_remove_host(shost);
1459
1460 iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
1461 iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
1462
1463 kfree(session->targetname);
1464
1465 iscsi_destroy_session(cls_session);
1466 scsi_host_put(shost);
1467 module_put(owner);
1468 }
1469 EXPORT_SYMBOL_GPL(iscsi_session_teardown);
1470
1471 /**
1472 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
1473 * @cls_session: iscsi_cls_session
1474 * @conn_idx: cid
1475 **/
1476 struct iscsi_cls_conn *
1477 iscsi_conn_setup(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
1478 {
1479 struct iscsi_session *session = class_to_transport_session(cls_session);
1480 struct iscsi_conn *conn;
1481 struct iscsi_cls_conn *cls_conn;
1482 char *data;
1483
1484 cls_conn = iscsi_create_conn(cls_session, conn_idx);
1485 if (!cls_conn)
1486 return NULL;
1487 conn = cls_conn->dd_data;
1488 memset(conn, 0, sizeof(*conn));
1489
1490 conn->session = session;
1491 conn->cls_conn = cls_conn;
1492 conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
1493 conn->id = conn_idx;
1494 conn->exp_statsn = 0;
1495 conn->tmabort_state = TMABORT_INITIAL;
1496 INIT_LIST_HEAD(&conn->run_list);
1497 INIT_LIST_HEAD(&conn->mgmt_run_list);
1498 INIT_LIST_HEAD(&conn->xmitqueue);
1499
1500 /* initialize general immediate & non-immediate PDU commands queue */
1501 conn->immqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*),
1502 GFP_KERNEL, NULL);
1503 if (conn->immqueue == ERR_PTR(-ENOMEM))
1504 goto immqueue_alloc_fail;
1505
1506 conn->mgmtqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*),
1507 GFP_KERNEL, NULL);
1508 if (conn->mgmtqueue == ERR_PTR(-ENOMEM))
1509 goto mgmtqueue_alloc_fail;
1510
1511 INIT_WORK(&conn->xmitwork, iscsi_xmitworker);
1512
1513 /* allocate login_mtask used for the login/text sequences */
1514 spin_lock_bh(&session->lock);
1515 if (!__kfifo_get(session->mgmtpool.queue,
1516 (void*)&conn->login_mtask,
1517 sizeof(void*))) {
1518 spin_unlock_bh(&session->lock);
1519 goto login_mtask_alloc_fail;
1520 }
1521 spin_unlock_bh(&session->lock);
1522
1523 data = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN, GFP_KERNEL);
1524 if (!data)
1525 goto login_mtask_data_alloc_fail;
1526 conn->login_mtask->data = conn->data = data;
1527
1528 init_timer(&conn->tmabort_timer);
1529 mutex_init(&conn->xmitmutex);
1530 init_waitqueue_head(&conn->ehwait);
1531
1532 return cls_conn;
1533
1534 login_mtask_data_alloc_fail:
1535 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
1536 sizeof(void*));
1537 login_mtask_alloc_fail:
1538 kfifo_free(conn->mgmtqueue);
1539 mgmtqueue_alloc_fail:
1540 kfifo_free(conn->immqueue);
1541 immqueue_alloc_fail:
1542 iscsi_destroy_conn(cls_conn);
1543 return NULL;
1544 }
1545 EXPORT_SYMBOL_GPL(iscsi_conn_setup);
1546
1547 /**
1548 * iscsi_conn_teardown - teardown iscsi connection
1549 * cls_conn: iscsi class connection
1550 *
1551 * TODO: we may need to make this into a two step process
1552 * like scsi-mls remove + put host
1553 */
1554 void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
1555 {
1556 struct iscsi_conn *conn = cls_conn->dd_data;
1557 struct iscsi_session *session = conn->session;
1558 unsigned long flags;
1559
1560 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1561 mutex_lock(&conn->xmitmutex);
1562
1563 spin_lock_bh(&session->lock);
1564 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
1565 if (session->leadconn == conn) {
1566 /*
1567 * leading connection? then give up on recovery.
1568 */
1569 session->state = ISCSI_STATE_TERMINATE;
1570 wake_up(&conn->ehwait);
1571 }
1572 spin_unlock_bh(&session->lock);
1573
1574 mutex_unlock(&conn->xmitmutex);
1575
1576 /*
1577 * Block until all in-progress commands for this connection
1578 * time out or fail.
1579 */
1580 for (;;) {
1581 spin_lock_irqsave(session->host->host_lock, flags);
1582 if (!session->host->host_busy) { /* OK for ERL == 0 */
1583 spin_unlock_irqrestore(session->host->host_lock, flags);
1584 break;
1585 }
1586 spin_unlock_irqrestore(session->host->host_lock, flags);
1587 msleep_interruptible(500);
1588 printk(KERN_INFO "iscsi: scsi conn_destroy(): host_busy %d "
1589 "host_failed %d\n", session->host->host_busy,
1590 session->host->host_failed);
1591 /*
1592 * force eh_abort() to unblock
1593 */
1594 wake_up(&conn->ehwait);
1595 }
1596
1597 /* flush queued up work because we free the connection below */
1598 scsi_flush_work(session->host);
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");
Linux kernel - Deliverables
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