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Linux 2.6.22-rc3
[linux-2.6/next.git] / drivers / scsi / libiscsi.c
blob3f5b9b445b29b1dcc4da21cfee9367fea9d532fa
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 <asm/unaligned.h>
29 #include <net/tcp.h>
30 #include <scsi/scsi_cmnd.h>
31 #include <scsi/scsi_device.h>
32 #include <scsi/scsi_eh.h>
33 #include <scsi/scsi_tcq.h>
34 #include <scsi/scsi_host.h>
35 #include <scsi/scsi.h>
36 #include <scsi/iscsi_proto.h>
37 #include <scsi/scsi_transport.h>
38 #include <scsi/scsi_transport_iscsi.h>
39 #include <scsi/libiscsi.h>
40
41 struct iscsi_session *
42 class_to_transport_session(struct iscsi_cls_session *cls_session)
43 {
44 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
45 return iscsi_hostdata(shost->hostdata);
46 }
47 EXPORT_SYMBOL_GPL(class_to_transport_session);
48
49 #define INVALID_SN_DELTA 0xffff
50
51 int
52 iscsi_check_assign_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr)
53 {
54 uint32_t max_cmdsn = be32_to_cpu(hdr->max_cmdsn);
55 uint32_t exp_cmdsn = be32_to_cpu(hdr->exp_cmdsn);
56
57 if (max_cmdsn < exp_cmdsn -1 &&
58 max_cmdsn > exp_cmdsn - INVALID_SN_DELTA)
59 return ISCSI_ERR_MAX_CMDSN;
60 if (max_cmdsn > session->max_cmdsn ||
61 max_cmdsn < session->max_cmdsn - INVALID_SN_DELTA)
62 session->max_cmdsn = max_cmdsn;
63 if (exp_cmdsn > session->exp_cmdsn ||
64 exp_cmdsn < session->exp_cmdsn - INVALID_SN_DELTA)
65 session->exp_cmdsn = exp_cmdsn;
66
67 return 0;
68 }
69 EXPORT_SYMBOL_GPL(iscsi_check_assign_cmdsn);
70
71 void iscsi_prep_unsolicit_data_pdu(struct iscsi_cmd_task *ctask,
72 struct iscsi_data *hdr)
73 {
74 struct iscsi_conn *conn = ctask->conn;
75
76 memset(hdr, 0, sizeof(struct iscsi_data));
77 hdr->ttt = cpu_to_be32(ISCSI_RESERVED_TAG);
78 hdr->datasn = cpu_to_be32(ctask->unsol_datasn);
79 ctask->unsol_datasn++;
80 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
81 memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
82
83 hdr->itt = ctask->hdr->itt;
84 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
85 hdr->offset = cpu_to_be32(ctask->unsol_offset);
86
87 if (ctask->unsol_count > conn->max_xmit_dlength) {
88 hton24(hdr->dlength, conn->max_xmit_dlength);
89 ctask->data_count = conn->max_xmit_dlength;
90 ctask->unsol_offset += ctask->data_count;
91 hdr->flags = 0;
92 } else {
93 hton24(hdr->dlength, ctask->unsol_count);
94 ctask->data_count = ctask->unsol_count;
95 hdr->flags = ISCSI_FLAG_CMD_FINAL;
96 }
97 }
98 EXPORT_SYMBOL_GPL(iscsi_prep_unsolicit_data_pdu);
99
100 /**
101 * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
102 * @ctask: iscsi cmd task
103 *
104 * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set
105 * fields like dlength or final based on how much data it sends
106 */
107 static void iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask)
108 {
109 struct iscsi_conn *conn = ctask->conn;
110 struct iscsi_session *session = conn->session;
111 struct iscsi_cmd *hdr = ctask->hdr;
112 struct scsi_cmnd *sc = ctask->sc;
113
114 hdr->opcode = ISCSI_OP_SCSI_CMD;
115 hdr->flags = ISCSI_ATTR_SIMPLE;
116 int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun);
117 hdr->itt = build_itt(ctask->itt, conn->id, session->age);
118 hdr->data_length = cpu_to_be32(sc->request_bufflen);
119 hdr->cmdsn = cpu_to_be32(session->cmdsn);
120 session->cmdsn++;
121 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
122 memcpy(hdr->cdb, sc->cmnd, sc->cmd_len);
123 memset(&hdr->cdb[sc->cmd_len], 0, MAX_COMMAND_SIZE - sc->cmd_len);
124
125 ctask->data_count = 0;
126 if (sc->sc_data_direction == DMA_TO_DEVICE) {
127 hdr->flags |= ISCSI_FLAG_CMD_WRITE;
128 /*
129 * Write counters:
130 *
131 * imm_count bytes to be sent right after
132 * SCSI PDU Header
133 *
134 * unsol_count bytes(as Data-Out) to be sent
135 * without R2T ack right after
136 * immediate data
137 *
138 * r2t_data_count bytes to be sent via R2T ack's
139 *
140 * pad_count bytes to be sent as zero-padding
141 */
142 ctask->imm_count = 0;
143 ctask->unsol_count = 0;
144 ctask->unsol_offset = 0;
145 ctask->unsol_datasn = 0;
146
147 if (session->imm_data_en) {
148 if (ctask->total_length >= session->first_burst)
149 ctask->imm_count = min(session->first_burst,
150 conn->max_xmit_dlength);
151 else
152 ctask->imm_count = min(ctask->total_length,
153 conn->max_xmit_dlength);
154 hton24(ctask->hdr->dlength, ctask->imm_count);
155 } else
156 zero_data(ctask->hdr->dlength);
157
158 if (!session->initial_r2t_en) {
159 ctask->unsol_count = min(session->first_burst,
160 ctask->total_length) - ctask->imm_count;
161 ctask->unsol_offset = ctask->imm_count;
162 }
163
164 if (!ctask->unsol_count)
165 /* No unsolicit Data-Out's */
166 ctask->hdr->flags |= ISCSI_FLAG_CMD_FINAL;
167 } else {
168 ctask->datasn = 0;
169 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
170 zero_data(hdr->dlength);
171
172 if (sc->sc_data_direction == DMA_FROM_DEVICE)
173 hdr->flags |= ISCSI_FLAG_CMD_READ;
174 }
175
176 conn->scsicmd_pdus_cnt++;
177 }
178 EXPORT_SYMBOL_GPL(iscsi_prep_scsi_cmd_pdu);
179
180 /**
181 * iscsi_complete_command - return command back to scsi-ml
182 * @ctask: iscsi cmd task
183 *
184 * Must be called with session lock.
185 * This function returns the scsi command to scsi-ml and returns
186 * the cmd task to the pool of available cmd tasks.
187 */
188 static void iscsi_complete_command(struct iscsi_cmd_task *ctask)
189 {
190 struct iscsi_session *session = ctask->conn->session;
191 struct scsi_cmnd *sc = ctask->sc;
192
193 ctask->state = ISCSI_TASK_COMPLETED;
194 ctask->sc = NULL;
195 /* SCSI eh reuses commands to verify us */
196 sc->SCp.ptr = NULL;
197 list_del_init(&ctask->running);
198 __kfifo_put(session->cmdpool.queue, (void*)&ctask, sizeof(void*));
199 sc->scsi_done(sc);
200 }
201
202 static void __iscsi_get_ctask(struct iscsi_cmd_task *ctask)
203 {
204 atomic_inc(&ctask->refcount);
205 }
206
207 static void iscsi_get_ctask(struct iscsi_cmd_task *ctask)
208 {
209 spin_lock_bh(&ctask->conn->session->lock);
210 __iscsi_get_ctask(ctask);
211 spin_unlock_bh(&ctask->conn->session->lock);
212 }
213
214 static void __iscsi_put_ctask(struct iscsi_cmd_task *ctask)
215 {
216 if (atomic_dec_and_test(&ctask->refcount))
217 iscsi_complete_command(ctask);
218 }
219
220 static void iscsi_put_ctask(struct iscsi_cmd_task *ctask)
221 {
222 spin_lock_bh(&ctask->conn->session->lock);
223 __iscsi_put_ctask(ctask);
224 spin_unlock_bh(&ctask->conn->session->lock);
225 }
226
227 /**
228 * iscsi_cmd_rsp - SCSI Command Response processing
229 * @conn: iscsi connection
230 * @hdr: iscsi header
231 * @ctask: scsi command task
232 * @data: cmd data buffer
233 * @datalen: len of buffer
234 *
235 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and
236 * then completes the command and task.
237 **/
238 static int iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
239 struct iscsi_cmd_task *ctask, char *data,
240 int datalen)
241 {
242 int rc;
243 struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)hdr;
244 struct iscsi_session *session = conn->session;
245 struct scsi_cmnd *sc = ctask->sc;
246
247 rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr);
248 if (rc) {
249 sc->result = DID_ERROR << 16;
250 goto out;
251 }
252
253 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
254
255 sc->result = (DID_OK << 16) | rhdr->cmd_status;
256
257 if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) {
258 sc->result = DID_ERROR << 16;
259 goto out;
260 }
261
262 if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) {
263 uint16_t senselen;
264
265 if (datalen < 2) {
266 invalid_datalen:
267 printk(KERN_ERR "iscsi: Got CHECK_CONDITION but "
268 "invalid data buffer size of %d\n", datalen);
269 sc->result = DID_BAD_TARGET << 16;
270 goto out;
271 }
272
273 senselen = be16_to_cpu(get_unaligned((__be16 *) data));
274 if (datalen < senselen)
275 goto invalid_datalen;
276
277 memcpy(sc->sense_buffer, data + 2,
278 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
279 debug_scsi("copied %d bytes of sense\n",
280 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
281 }
282
283 if (sc->sc_data_direction == DMA_TO_DEVICE)
284 goto out;
285
286 if (rhdr->flags & ISCSI_FLAG_CMD_UNDERFLOW) {
287 int res_count = be32_to_cpu(rhdr->residual_count);
288
289 if (res_count > 0 && res_count <= sc->request_bufflen)
290 sc->resid = res_count;
291 else
292 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
293 } else if (rhdr->flags & ISCSI_FLAG_CMD_BIDI_UNDERFLOW)
294 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
295 else if (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW)
296 sc->resid = be32_to_cpu(rhdr->residual_count);
297
298 out:
299 debug_scsi("done [sc %lx res %d itt 0x%x]\n",
300 (long)sc, sc->result, ctask->itt);
301 conn->scsirsp_pdus_cnt++;
302
303 __iscsi_put_ctask(ctask);
304 return rc;
305 }
306
307 static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
308 {
309 struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr;
310
311 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
312 conn->tmfrsp_pdus_cnt++;
313
314 if (conn->tmabort_state != TMABORT_INITIAL)
315 return;
316
317 if (tmf->response == ISCSI_TMF_RSP_COMPLETE)
318 conn->tmabort_state = TMABORT_SUCCESS;
319 else if (tmf->response == ISCSI_TMF_RSP_NO_TASK)
320 conn->tmabort_state = TMABORT_NOT_FOUND;
321 else
322 conn->tmabort_state = TMABORT_FAILED;
323 wake_up(&conn->ehwait);
324 }
325
326 static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
327 char *data, int datalen)
328 {
329 struct iscsi_reject *reject = (struct iscsi_reject *)hdr;
330 struct iscsi_hdr rejected_pdu;
331 uint32_t itt;
332
333 conn->exp_statsn = be32_to_cpu(reject->statsn) + 1;
334
335 if (reject->reason == ISCSI_REASON_DATA_DIGEST_ERROR) {
336 if (ntoh24(reject->dlength) > datalen)
337 return ISCSI_ERR_PROTO;
338
339 if (ntoh24(reject->dlength) >= sizeof(struct iscsi_hdr)) {
340 memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr));
341 itt = get_itt(rejected_pdu.itt);
342 printk(KERN_ERR "itt 0x%x had pdu (op 0x%x) rejected "
343 "due to DataDigest error.\n", itt,
344 rejected_pdu.opcode);
345 }
346 }
347 return 0;
348 }
349
350 /**
351 * __iscsi_complete_pdu - complete pdu
352 * @conn: iscsi conn
353 * @hdr: iscsi header
354 * @data: data buffer
355 * @datalen: len of data buffer
356 *
357 * Completes pdu processing by freeing any resources allocated at
358 * queuecommand or send generic. session lock must be held and verify
359 * itt must have been called.
360 */
361 int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
362 char *data, int datalen)
363 {
364 struct iscsi_session *session = conn->session;
365 int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0;
366 struct iscsi_cmd_task *ctask;
367 struct iscsi_mgmt_task *mtask;
368 uint32_t itt;
369
370 if (hdr->itt != RESERVED_ITT)
371 itt = get_itt(hdr->itt);
372 else
373 itt = ~0U;
374
375 if (itt < session->cmds_max) {
376 ctask = session->cmds[itt];
377
378 debug_scsi("cmdrsp [op 0x%x cid %d itt 0x%x len %d]\n",
379 opcode, conn->id, ctask->itt, datalen);
380
381 switch(opcode) {
382 case ISCSI_OP_SCSI_CMD_RSP:
383 BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
384 rc = iscsi_scsi_cmd_rsp(conn, hdr, ctask, data,
385 datalen);
386 break;
387 case ISCSI_OP_SCSI_DATA_IN:
388 BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
389 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
390 conn->scsirsp_pdus_cnt++;
391 __iscsi_put_ctask(ctask);
392 }
393 break;
394 case ISCSI_OP_R2T:
395 /* LLD handles this for now */
396 break;
397 default:
398 rc = ISCSI_ERR_BAD_OPCODE;
399 break;
400 }
401 } else if (itt >= ISCSI_MGMT_ITT_OFFSET &&
402 itt < ISCSI_MGMT_ITT_OFFSET + session->mgmtpool_max) {
403 mtask = session->mgmt_cmds[itt - ISCSI_MGMT_ITT_OFFSET];
404
405 debug_scsi("immrsp [op 0x%x cid %d itt 0x%x len %d]\n",
406 opcode, conn->id, mtask->itt, datalen);
407
408 rc = iscsi_check_assign_cmdsn(session,
409 (struct iscsi_nopin*)hdr);
410 if (rc)
411 goto done;
412
413 switch(opcode) {
414 case ISCSI_OP_LOGOUT_RSP:
415 if (datalen) {
416 rc = ISCSI_ERR_PROTO;
417 break;
418 }
419 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
420 /* fall through */
421 case ISCSI_OP_LOGIN_RSP:
422 case ISCSI_OP_TEXT_RSP:
423 /*
424 * login related PDU's exp_statsn is handled in
425 * userspace
426 */
427 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
428 rc = ISCSI_ERR_CONN_FAILED;
429 list_del(&mtask->running);
430 if (conn->login_mtask != mtask)
431 __kfifo_put(session->mgmtpool.queue,
432 (void*)&mtask, sizeof(void*));
433 break;
434 case ISCSI_OP_SCSI_TMFUNC_RSP:
435 if (datalen) {
436 rc = ISCSI_ERR_PROTO;
437 break;
438 }
439
440 iscsi_tmf_rsp(conn, hdr);
441 break;
442 case ISCSI_OP_NOOP_IN:
443 if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) {
444 rc = ISCSI_ERR_PROTO;
445 break;
446 }
447 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
448
449 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
450 rc = ISCSI_ERR_CONN_FAILED;
451 list_del(&mtask->running);
452 if (conn->login_mtask != mtask)
453 __kfifo_put(session->mgmtpool.queue,
454 (void*)&mtask, sizeof(void*));
455 break;
456 default:
457 rc = ISCSI_ERR_BAD_OPCODE;
458 break;
459 }
460 } else if (itt == ~0U) {
461 rc = iscsi_check_assign_cmdsn(session,
462 (struct iscsi_nopin*)hdr);
463 if (rc)
464 goto done;
465
466 switch(opcode) {
467 case ISCSI_OP_NOOP_IN:
468 if (datalen) {
469 rc = ISCSI_ERR_PROTO;
470 break;
471 }
472
473 if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG))
474 break;
475
476 if (iscsi_recv_pdu(conn->cls_conn, hdr, NULL, 0))
477 rc = ISCSI_ERR_CONN_FAILED;
478 break;
479 case ISCSI_OP_REJECT:
480 rc = iscsi_handle_reject(conn, hdr, data, datalen);
481 break;
482 case ISCSI_OP_ASYNC_EVENT:
483 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
484 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
485 rc = ISCSI_ERR_CONN_FAILED;
486 break;
487 default:
488 rc = ISCSI_ERR_BAD_OPCODE;
489 break;
490 }
491 } else
492 rc = ISCSI_ERR_BAD_ITT;
493
494 done:
495 return rc;
496 }
497 EXPORT_SYMBOL_GPL(__iscsi_complete_pdu);
498
499 int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
500 char *data, int datalen)
501 {
502 int rc;
503
504 spin_lock(&conn->session->lock);
505 rc = __iscsi_complete_pdu(conn, hdr, data, datalen);
506 spin_unlock(&conn->session->lock);
507 return rc;
508 }
509 EXPORT_SYMBOL_GPL(iscsi_complete_pdu);
510
511 /* verify itt (itt encoding: age+cid+itt) */
512 int iscsi_verify_itt(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
513 uint32_t *ret_itt)
514 {
515 struct iscsi_session *session = conn->session;
516 struct iscsi_cmd_task *ctask;
517 uint32_t itt;
518
519 if (hdr->itt != RESERVED_ITT) {
520 if (((__force u32)hdr->itt & ISCSI_AGE_MASK) !=
521 (session->age << ISCSI_AGE_SHIFT)) {
522 printk(KERN_ERR "iscsi: received itt %x expected "
523 "session age (%x)\n", (__force u32)hdr->itt,
524 session->age & ISCSI_AGE_MASK);
525 return ISCSI_ERR_BAD_ITT;
526 }
527
528 if (((__force u32)hdr->itt & ISCSI_CID_MASK) !=
529 (conn->id << ISCSI_CID_SHIFT)) {
530 printk(KERN_ERR "iscsi: received itt %x, expected "
531 "CID (%x)\n", (__force u32)hdr->itt, conn->id);
532 return ISCSI_ERR_BAD_ITT;
533 }
534 itt = get_itt(hdr->itt);
535 } else
536 itt = ~0U;
537
538 if (itt < session->cmds_max) {
539 ctask = session->cmds[itt];
540
541 if (!ctask->sc) {
542 printk(KERN_INFO "iscsi: dropping ctask with "
543 "itt 0x%x\n", ctask->itt);
544 /* force drop */
545 return ISCSI_ERR_NO_SCSI_CMD;
546 }
547
548 if (ctask->sc->SCp.phase != session->age) {
549 printk(KERN_ERR "iscsi: ctask's session age %d, "
550 "expected %d\n", ctask->sc->SCp.phase,
551 session->age);
552 return ISCSI_ERR_SESSION_FAILED;
553 }
554 }
555
556 *ret_itt = itt;
557 return 0;
558 }
559 EXPORT_SYMBOL_GPL(iscsi_verify_itt);
560
561 void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
562 {
563 struct iscsi_session *session = conn->session;
564 unsigned long flags;
565
566 spin_lock_irqsave(&session->lock, flags);
567 if (session->state == ISCSI_STATE_FAILED) {
568 spin_unlock_irqrestore(&session->lock, flags);
569 return;
570 }
571
572 if (conn->stop_stage == 0)
573 session->state = ISCSI_STATE_FAILED;
574 spin_unlock_irqrestore(&session->lock, flags);
575 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
576 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
577 iscsi_conn_error(conn->cls_conn, err);
578 }
579 EXPORT_SYMBOL_GPL(iscsi_conn_failure);
580
581 static int iscsi_xmit_mtask(struct iscsi_conn *conn)
582 {
583 struct iscsi_hdr *hdr = conn->mtask->hdr;
584 int rc, was_logout = 0;
585
586 if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT) {
587 conn->session->state = ISCSI_STATE_IN_RECOVERY;
588 iscsi_block_session(session_to_cls(conn->session));
589 was_logout = 1;
590 }
591 rc = conn->session->tt->xmit_mgmt_task(conn, conn->mtask);
592 if (rc)
593 return rc;
594
595 /* done with this in-progress mtask */
596 conn->mtask = NULL;
597
598 if (was_logout) {
599 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
600 return -ENODATA;
601 }
602 return 0;
603 }
604
605 /**
606 * iscsi_data_xmit - xmit any command into the scheduled connection
607 * @conn: iscsi connection
608 *
609 * Notes:
610 * The function can return -EAGAIN in which case the caller must
611 * re-schedule it again later or recover. '0' return code means
612 * successful xmit.
613 **/
614 static int iscsi_data_xmit(struct iscsi_conn *conn)
615 {
616 struct iscsi_transport *tt;
617 int rc = 0;
618
619 if (unlikely(conn->suspend_tx)) {
620 debug_scsi("conn %d Tx suspended!\n", conn->id);
621 return -ENODATA;
622 }
623 tt = conn->session->tt;
624
625 /*
626 * Transmit in the following order:
627 *
628 * 1) un-finished xmit (ctask or mtask)
629 * 2) immediate control PDUs
630 * 3) write data
631 * 4) SCSI commands
632 * 5) non-immediate control PDUs
633 *
634 * No need to lock around __kfifo_get as long as
635 * there's one producer and one consumer.
636 */
637
638 BUG_ON(conn->ctask && conn->mtask);
639
640 if (conn->ctask) {
641 iscsi_get_ctask(conn->ctask);
642 rc = tt->xmit_cmd_task(conn, conn->ctask);
643 iscsi_put_ctask(conn->ctask);
644 if (rc)
645 goto again;
646 /* done with this in-progress ctask */
647 conn->ctask = NULL;
648 }
649 if (conn->mtask) {
650 rc = iscsi_xmit_mtask(conn);
651 if (rc)
652 goto again;
653 }
654
655 /* process immediate first */
656 if (unlikely(__kfifo_len(conn->immqueue))) {
657 while (__kfifo_get(conn->immqueue, (void*)&conn->mtask,
658 sizeof(void*))) {
659 spin_lock_bh(&conn->session->lock);
660 list_add_tail(&conn->mtask->running,
661 &conn->mgmt_run_list);
662 spin_unlock_bh(&conn->session->lock);
663 rc = iscsi_xmit_mtask(conn);
664 if (rc)
665 goto again;
666 }
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 = iscsi_xmit_mtask(conn);
705 if (rc)
706 goto again;
707 }
708 }
709
710 return -ENODATA;
711
712 again:
713 if (unlikely(conn->suspend_tx))
714 return -ENODATA;
715
716 return rc;
717 }
718
719 static void iscsi_xmitworker(struct work_struct *work)
720 {
721 struct iscsi_conn *conn =
722 container_of(work, struct iscsi_conn, xmitwork);
723 int rc;
724 /*
725 * serialize Xmit worker on a per-connection basis.
726 */
727 mutex_lock(&conn->xmitmutex);
728 do {
729 rc = iscsi_data_xmit(conn);
730 } while (rc >= 0 || rc == -EAGAIN);
731 mutex_unlock(&conn->xmitmutex);
732 }
733
734 enum {
735 FAILURE_BAD_HOST = 1,
736 FAILURE_SESSION_FAILED,
737 FAILURE_SESSION_FREED,
738 FAILURE_WINDOW_CLOSED,
739 FAILURE_OOM,
740 FAILURE_SESSION_TERMINATE,
741 FAILURE_SESSION_IN_RECOVERY,
742 FAILURE_SESSION_RECOVERY_TIMEOUT,
743 };
744
745 int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
746 {
747 struct Scsi_Host *host;
748 int reason = 0;
749 struct iscsi_session *session;
750 struct iscsi_conn *conn;
751 struct iscsi_cmd_task *ctask = NULL;
752
753 sc->scsi_done = done;
754 sc->result = 0;
755 sc->SCp.ptr = NULL;
756
757 host = sc->device->host;
758 session = iscsi_hostdata(host->hostdata);
759
760 spin_lock(&session->lock);
761
762 /*
763 * ISCSI_STATE_FAILED is a temp. state. The recovery
764 * code will decide what is best to do with command queued
765 * during this time
766 */
767 if (session->state != ISCSI_STATE_LOGGED_IN &&
768 session->state != ISCSI_STATE_FAILED) {
769 /*
770 * to handle the race between when we set the recovery state
771 * and block the session we requeue here (commands could
772 * be entering our queuecommand while a block is starting
773 * up because the block code is not locked)
774 */
775 if (session->state == ISCSI_STATE_IN_RECOVERY) {
776 reason = FAILURE_SESSION_IN_RECOVERY;
777 goto reject;
778 }
779
780 if (session->state == ISCSI_STATE_RECOVERY_FAILED)
781 reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
782 else if (session->state == ISCSI_STATE_TERMINATE)
783 reason = FAILURE_SESSION_TERMINATE;
784 else
785 reason = FAILURE_SESSION_FREED;
786 goto fault;
787 }
788
789 /*
790 * Check for iSCSI window and take care of CmdSN wrap-around
791 */
792 if ((int)(session->max_cmdsn - session->cmdsn) < 0) {
793 reason = FAILURE_WINDOW_CLOSED;
794 goto reject;
795 }
796
797 conn = session->leadconn;
798 if (!conn) {
799 reason = FAILURE_SESSION_FREED;
800 goto fault;
801 }
802
803 if (!__kfifo_get(session->cmdpool.queue, (void*)&ctask,
804 sizeof(void*))) {
805 reason = FAILURE_OOM;
806 goto reject;
807 }
808 sc->SCp.phase = session->age;
809 sc->SCp.ptr = (char *)ctask;
810
811 atomic_set(&ctask->refcount, 1);
812 ctask->state = ISCSI_TASK_PENDING;
813 ctask->mtask = NULL;
814 ctask->conn = conn;
815 ctask->sc = sc;
816 INIT_LIST_HEAD(&ctask->running);
817 ctask->total_length = sc->request_bufflen;
818 iscsi_prep_scsi_cmd_pdu(ctask);
819
820 session->tt->init_cmd_task(ctask);
821
822 list_add_tail(&ctask->running, &conn->xmitqueue);
823 debug_scsi(
824 "ctask enq [%s cid %d sc %p cdb 0x%x itt 0x%x len %d cmdsn %d "
825 "win %d]\n",
826 sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read",
827 conn->id, sc, sc->cmnd[0], ctask->itt, sc->request_bufflen,
828 session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1);
829 spin_unlock(&session->lock);
830
831 scsi_queue_work(host, &conn->xmitwork);
832 return 0;
833
834 reject:
835 spin_unlock(&session->lock);
836 debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason);
837 return SCSI_MLQUEUE_HOST_BUSY;
838
839 fault:
840 spin_unlock(&session->lock);
841 printk(KERN_ERR "iscsi: cmd 0x%x is not queued (%d)\n",
842 sc->cmnd[0], reason);
843 sc->result = (DID_NO_CONNECT << 16);
844 sc->resid = sc->request_bufflen;
845 sc->scsi_done(sc);
846 return 0;
847 }
848 EXPORT_SYMBOL_GPL(iscsi_queuecommand);
849
850 int iscsi_change_queue_depth(struct scsi_device *sdev, int depth)
851 {
852 if (depth > ISCSI_MAX_CMD_PER_LUN)
853 depth = ISCSI_MAX_CMD_PER_LUN;
854 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
855 return sdev->queue_depth;
856 }
857 EXPORT_SYMBOL_GPL(iscsi_change_queue_depth);
858
859 static int
860 iscsi_conn_send_generic(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
861 char *data, uint32_t data_size)
862 {
863 struct iscsi_session *session = conn->session;
864 struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
865 struct iscsi_mgmt_task *mtask;
866
867 spin_lock_bh(&session->lock);
868 if (session->state == ISCSI_STATE_TERMINATE) {
869 spin_unlock_bh(&session->lock);
870 return -EPERM;
871 }
872 if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) ||
873 hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
874 /*
875 * Login and Text are sent serially, in
876 * request-followed-by-response sequence.
877 * Same mtask can be used. Same ITT must be used.
878 * Note that login_mtask is preallocated at conn_create().
879 */
880 mtask = conn->login_mtask;
881 else {
882 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
883 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
884
885 nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
886 if (!__kfifo_get(session->mgmtpool.queue,
887 (void*)&mtask, sizeof(void*))) {
888 spin_unlock_bh(&session->lock);
889 return -ENOSPC;
890 }
891 }
892
893 /*
894 * pre-format CmdSN for outgoing PDU.
895 */
896 if (hdr->itt != RESERVED_ITT) {
897 hdr->itt = build_itt(mtask->itt, conn->id, session->age);
898 nop->cmdsn = cpu_to_be32(session->cmdsn);
899 if (conn->c_stage == ISCSI_CONN_STARTED &&
900 !(hdr->opcode & ISCSI_OP_IMMEDIATE))
901 session->cmdsn++;
902 } else
903 /* do not advance CmdSN */
904 nop->cmdsn = cpu_to_be32(session->cmdsn);
905
906 if (data_size) {
907 memcpy(mtask->data, data, data_size);
908 mtask->data_count = data_size;
909 } else
910 mtask->data_count = 0;
911
912 INIT_LIST_HEAD(&mtask->running);
913 memcpy(mtask->hdr, hdr, sizeof(struct iscsi_hdr));
914 if (session->tt->init_mgmt_task)
915 session->tt->init_mgmt_task(conn, mtask, data, data_size);
916 spin_unlock_bh(&session->lock);
917
918 debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n",
919 hdr->opcode, hdr->itt, data_size);
920
921 /*
922 * since send_pdu() could be called at least from two contexts,
923 * we need to serialize __kfifo_put, so we don't have to take
924 * additional lock on fast data-path
925 */
926 if (hdr->opcode & ISCSI_OP_IMMEDIATE)
927 __kfifo_put(conn->immqueue, (void*)&mtask, sizeof(void*));
928 else
929 __kfifo_put(conn->mgmtqueue, (void*)&mtask, sizeof(void*));
930
931 scsi_queue_work(session->host, &conn->xmitwork);
932 return 0;
933 }
934
935 int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr,
936 char *data, uint32_t data_size)
937 {
938 struct iscsi_conn *conn = cls_conn->dd_data;
939 int rc;
940
941 mutex_lock(&conn->xmitmutex);
942 rc = iscsi_conn_send_generic(conn, hdr, data, data_size);
943 mutex_unlock(&conn->xmitmutex);
944
945 return rc;
946 }
947 EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu);
948
949 void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
950 {
951 struct iscsi_session *session = class_to_transport_session(cls_session);
952 struct iscsi_conn *conn = session->leadconn;
953
954 spin_lock_bh(&session->lock);
955 if (session->state != ISCSI_STATE_LOGGED_IN) {
956 session->state = ISCSI_STATE_RECOVERY_FAILED;
957 if (conn)
958 wake_up(&conn->ehwait);
959 }
960 spin_unlock_bh(&session->lock);
961 }
962 EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
963
964 int iscsi_eh_host_reset(struct scsi_cmnd *sc)
965 {
966 struct Scsi_Host *host = sc->device->host;
967 struct iscsi_session *session = iscsi_hostdata(host->hostdata);
968 struct iscsi_conn *conn = session->leadconn;
969 int fail_session = 0;
970
971 spin_lock_bh(&session->lock);
972 if (session->state == ISCSI_STATE_TERMINATE) {
973 failed:
974 debug_scsi("failing host reset: session terminated "
975 "[CID %d age %d]\n", conn->id, session->age);
976 spin_unlock_bh(&session->lock);
977 return FAILED;
978 }
979
980 if (sc->SCp.phase == session->age) {
981 debug_scsi("failing connection CID %d due to SCSI host reset\n",
982 conn->id);
983 fail_session = 1;
984 }
985 spin_unlock_bh(&session->lock);
986
987 /*
988 * we drop the lock here but the leadconn cannot be destoyed while
989 * we are in the scsi eh
990 */
991 if (fail_session)
992 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
993
994 debug_scsi("iscsi_eh_host_reset wait for relogin\n");
995 wait_event_interruptible(conn->ehwait,
996 session->state == ISCSI_STATE_TERMINATE ||
997 session->state == ISCSI_STATE_LOGGED_IN ||
998 session->state == ISCSI_STATE_RECOVERY_FAILED);
999 if (signal_pending(current))
1000 flush_signals(current);
1001
1002 spin_lock_bh(&session->lock);
1003 if (session->state == ISCSI_STATE_LOGGED_IN)
1004 printk(KERN_INFO "iscsi: host reset succeeded\n");
1005 else
1006 goto failed;
1007 spin_unlock_bh(&session->lock);
1008
1009 return SUCCESS;
1010 }
1011 EXPORT_SYMBOL_GPL(iscsi_eh_host_reset);
1012
1013 static void iscsi_tmabort_timedout(unsigned long data)
1014 {
1015 struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)data;
1016 struct iscsi_conn *conn = ctask->conn;
1017 struct iscsi_session *session = conn->session;
1018
1019 spin_lock(&session->lock);
1020 if (conn->tmabort_state == TMABORT_INITIAL) {
1021 conn->tmabort_state = TMABORT_TIMEDOUT;
1022 debug_scsi("tmabort timedout [sc %p itt 0x%x]\n",
1023 ctask->sc, ctask->itt);
1024 /* unblock eh_abort() */
1025 wake_up(&conn->ehwait);
1026 }
1027 spin_unlock(&session->lock);
1028 }
1029
1030 /* must be called with the mutex lock */
1031 static int iscsi_exec_abort_task(struct scsi_cmnd *sc,
1032 struct iscsi_cmd_task *ctask)
1033 {
1034 struct iscsi_conn *conn = ctask->conn;
1035 struct iscsi_session *session = conn->session;
1036 struct iscsi_tm *hdr = &conn->tmhdr;
1037 int rc;
1038
1039 /*
1040 * ctask timed out but session is OK requests must be serialized.
1041 */
1042 memset(hdr, 0, sizeof(struct iscsi_tm));
1043 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
1044 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK;
1045 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
1046 memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
1047 hdr->rtt = ctask->hdr->itt;
1048 hdr->refcmdsn = ctask->hdr->cmdsn;
1049
1050 rc = iscsi_conn_send_generic(conn, (struct iscsi_hdr *)hdr,
1051 NULL, 0);
1052 if (rc) {
1053 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1054 debug_scsi("abort sent failure [itt 0x%x] %d\n", ctask->itt,
1055 rc);
1056 return rc;
1057 }
1058
1059 debug_scsi("abort sent [itt 0x%x]\n", ctask->itt);
1060
1061 spin_lock_bh(&session->lock);
1062 ctask->mtask = (struct iscsi_mgmt_task *)
1063 session->mgmt_cmds[get_itt(hdr->itt) -
1064 ISCSI_MGMT_ITT_OFFSET];
1065
1066 if (conn->tmabort_state == TMABORT_INITIAL) {
1067 conn->tmfcmd_pdus_cnt++;
1068 conn->tmabort_timer.expires = 10*HZ + jiffies;
1069 conn->tmabort_timer.function = iscsi_tmabort_timedout;
1070 conn->tmabort_timer.data = (unsigned long)ctask;
1071 add_timer(&conn->tmabort_timer);
1072 debug_scsi("abort set timeout [itt 0x%x]\n", ctask->itt);
1073 }
1074 spin_unlock_bh(&session->lock);
1075 mutex_unlock(&conn->xmitmutex);
1076
1077 /*
1078 * block eh thread until:
1079 *
1080 * 1) abort response
1081 * 2) abort timeout
1082 * 3) session is terminated or restarted or userspace has
1083 * given up on recovery
1084 */
1085 wait_event_interruptible(conn->ehwait,
1086 sc->SCp.phase != session->age ||
1087 session->state != ISCSI_STATE_LOGGED_IN ||
1088 conn->tmabort_state != TMABORT_INITIAL);
1089 if (signal_pending(current))
1090 flush_signals(current);
1091 del_timer_sync(&conn->tmabort_timer);
1092
1093 mutex_lock(&conn->xmitmutex);
1094 return 0;
1095 }
1096
1097 /*
1098 * xmit mutex and session lock must be held
1099 */
1100 static struct iscsi_mgmt_task *
1101 iscsi_remove_mgmt_task(struct kfifo *fifo, uint32_t itt)
1102 {
1103 int i, nr_tasks = __kfifo_len(fifo) / sizeof(void*);
1104 struct iscsi_mgmt_task *task;
1105
1106 debug_scsi("searching %d tasks\n", nr_tasks);
1107
1108 for (i = 0; i < nr_tasks; i++) {
1109 __kfifo_get(fifo, (void*)&task, sizeof(void*));
1110 debug_scsi("check task %u\n", task->itt);
1111
1112 if (task->itt == itt) {
1113 debug_scsi("matched task\n");
1114 return task;
1115 }
1116
1117 __kfifo_put(fifo, (void*)&task, sizeof(void*));
1118 }
1119 return NULL;
1120 }
1121
1122 static int iscsi_ctask_mtask_cleanup(struct iscsi_cmd_task *ctask)
1123 {
1124 struct iscsi_conn *conn = ctask->conn;
1125 struct iscsi_session *session = conn->session;
1126
1127 if (!ctask->mtask)
1128 return -EINVAL;
1129
1130 if (!iscsi_remove_mgmt_task(conn->immqueue, ctask->mtask->itt))
1131 list_del(&ctask->mtask->running);
1132 __kfifo_put(session->mgmtpool.queue, (void*)&ctask->mtask,
1133 sizeof(void*));
1134 ctask->mtask = NULL;
1135 return 0;
1136 }
1137
1138 /*
1139 * session lock and xmitmutex must be held
1140 */
1141 static void fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
1142 int err)
1143 {
1144 struct scsi_cmnd *sc;
1145
1146 sc = ctask->sc;
1147 if (!sc)
1148 return;
1149
1150 conn->session->tt->cleanup_cmd_task(conn, ctask);
1151 iscsi_ctask_mtask_cleanup(ctask);
1152
1153 sc->result = err;
1154 sc->resid = sc->request_bufflen;
1155 /* release ref from queuecommand */
1156 __iscsi_put_ctask(ctask);
1157 }
1158
1159 int iscsi_eh_abort(struct scsi_cmnd *sc)
1160 {
1161 struct iscsi_cmd_task *ctask;
1162 struct iscsi_conn *conn;
1163 struct iscsi_session *session;
1164 int rc;
1165
1166 /*
1167 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
1168 * got the command.
1169 */
1170 if (!sc->SCp.ptr) {
1171 debug_scsi("sc never reached iscsi layer or it completed.\n");
1172 return SUCCESS;
1173 }
1174
1175 ctask = (struct iscsi_cmd_task *)sc->SCp.ptr;
1176 conn = ctask->conn;
1177 session = conn->session;
1178
1179 conn->eh_abort_cnt++;
1180 debug_scsi("aborting [sc %p itt 0x%x]\n", sc, ctask->itt);
1181
1182 mutex_lock(&conn->xmitmutex);
1183 spin_lock_bh(&session->lock);
1184
1185 /*
1186 * If we are not logged in or we have started a new session
1187 * then let the host reset code handle this
1188 */
1189 if (session->state != ISCSI_STATE_LOGGED_IN ||
1190 sc->SCp.phase != session->age)
1191 goto failed;
1192
1193 /* ctask completed before time out */
1194 if (!ctask->sc) {
1195 spin_unlock_bh(&session->lock);
1196 debug_scsi("sc completed while abort in progress\n");
1197 goto success_rel_mutex;
1198 }
1199
1200 /* what should we do here ? */
1201 if (conn->ctask == ctask) {
1202 printk(KERN_INFO "iscsi: sc %p itt 0x%x partially sent. "
1203 "Failing abort\n", sc, ctask->itt);
1204 goto failed;
1205 }
1206
1207 if (ctask->state == ISCSI_TASK_PENDING)
1208 goto success_cleanup;
1209
1210 conn->tmabort_state = TMABORT_INITIAL;
1211
1212 spin_unlock_bh(&session->lock);
1213 rc = iscsi_exec_abort_task(sc, ctask);
1214 spin_lock_bh(&session->lock);
1215
1216 if (rc || sc->SCp.phase != session->age ||
1217 session->state != ISCSI_STATE_LOGGED_IN)
1218 goto failed;
1219 iscsi_ctask_mtask_cleanup(ctask);
1220
1221 switch (conn->tmabort_state) {
1222 case TMABORT_SUCCESS:
1223 goto success_cleanup;
1224 case TMABORT_NOT_FOUND:
1225 if (!ctask->sc) {
1226 /* ctask completed before tmf abort response */
1227 spin_unlock_bh(&session->lock);
1228 debug_scsi("sc completed while abort in progress\n");
1229 goto success_rel_mutex;
1230 }
1231 /* fall through */
1232 default:
1233 /* timedout or failed */
1234 spin_unlock_bh(&session->lock);
1235 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1236 spin_lock_bh(&session->lock);
1237 goto failed;
1238 }
1239
1240 success_cleanup:
1241 debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
1242 spin_unlock_bh(&session->lock);
1243
1244 /*
1245 * clean up task if aborted. we have the xmitmutex so grab
1246 * the recv lock as a writer
1247 */
1248 write_lock_bh(conn->recv_lock);
1249 spin_lock(&session->lock);
1250 fail_command(conn, ctask, DID_ABORT << 16);
1251 spin_unlock(&session->lock);
1252 write_unlock_bh(conn->recv_lock);
1253
1254 success_rel_mutex:
1255 mutex_unlock(&conn->xmitmutex);
1256 return SUCCESS;
1257
1258 failed:
1259 spin_unlock_bh(&session->lock);
1260 mutex_unlock(&conn->xmitmutex);
1261
1262 debug_scsi("abort failed [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
1263 return FAILED;
1264 }
1265 EXPORT_SYMBOL_GPL(iscsi_eh_abort);
1266
1267 int
1268 iscsi_pool_init(struct iscsi_queue *q, int max, void ***items, int item_size)
1269 {
1270 int i;
1271
1272 *items = kmalloc(max * sizeof(void*), GFP_KERNEL);
1273 if (*items == NULL)
1274 return -ENOMEM;
1275
1276 q->max = max;
1277 q->pool = kmalloc(max * sizeof(void*), GFP_KERNEL);
1278 if (q->pool == NULL) {
1279 kfree(*items);
1280 return -ENOMEM;
1281 }
1282
1283 q->queue = kfifo_init((void*)q->pool, max * sizeof(void*),
1284 GFP_KERNEL, NULL);
1285 if (q->queue == ERR_PTR(-ENOMEM)) {
1286 kfree(q->pool);
1287 kfree(*items);
1288 return -ENOMEM;
1289 }
1290
1291 for (i = 0; i < max; i++) {
1292 q->pool[i] = kmalloc(item_size, GFP_KERNEL);
1293 if (q->pool[i] == NULL) {
1294 int j;
1295
1296 for (j = 0; j < i; j++)
1297 kfree(q->pool[j]);
1298
1299 kfifo_free(q->queue);
1300 kfree(q->pool);
1301 kfree(*items);
1302 return -ENOMEM;
1303 }
1304 memset(q->pool[i], 0, item_size);
1305 (*items)[i] = q->pool[i];
1306 __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*));
1307 }
1308 return 0;
1309 }
1310 EXPORT_SYMBOL_GPL(iscsi_pool_init);
1311
1312 void iscsi_pool_free(struct iscsi_queue *q, void **items)
1313 {
1314 int i;
1315
1316 for (i = 0; i < q->max; i++)
1317 kfree(items[i]);
1318 kfree(q->pool);
1319 kfree(items);
1320 }
1321 EXPORT_SYMBOL_GPL(iscsi_pool_free);
1322
1323 /*
1324 * iSCSI Session's hostdata organization:
1325 *
1326 * *------------------* <== hostdata_session(host->hostdata)
1327 * | ptr to class sess|
1328 * |------------------| <== iscsi_hostdata(host->hostdata)
1329 * | iscsi_session |
1330 * *------------------*
1331 */
1332
1333 #define hostdata_privsize(_sz) (sizeof(unsigned long) + _sz + \
1334 _sz % sizeof(unsigned long))
1335
1336 #define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata))
1337
1338 /**
1339 * iscsi_session_setup - create iscsi cls session and host and session
1340 * @scsit: scsi transport template
1341 * @iscsit: iscsi transport template
1342 * @initial_cmdsn: initial CmdSN
1343 * @hostno: host no allocated
1344 *
1345 * This can be used by software iscsi_transports that allocate
1346 * a session per scsi host.
1347 **/
1348 struct iscsi_cls_session *
1349 iscsi_session_setup(struct iscsi_transport *iscsit,
1350 struct scsi_transport_template *scsit,
1351 int cmd_task_size, int mgmt_task_size,
1352 uint32_t initial_cmdsn, uint32_t *hostno)
1353 {
1354 struct Scsi_Host *shost;
1355 struct iscsi_session *session;
1356 struct iscsi_cls_session *cls_session;
1357 int cmd_i;
1358
1359 shost = scsi_host_alloc(iscsit->host_template,
1360 hostdata_privsize(sizeof(*session)));
1361 if (!shost)
1362 return NULL;
1363
1364 shost->max_id = 1;
1365 shost->max_channel = 0;
1366 shost->max_lun = iscsit->max_lun;
1367 shost->max_cmd_len = iscsit->max_cmd_len;
1368 shost->transportt = scsit;
1369 shost->transportt->create_work_queue = 1;
1370 *hostno = shost->host_no;
1371
1372 session = iscsi_hostdata(shost->hostdata);
1373 memset(session, 0, sizeof(struct iscsi_session));
1374 session->host = shost;
1375 session->state = ISCSI_STATE_FREE;
1376 session->mgmtpool_max = ISCSI_MGMT_CMDS_MAX;
1377 session->cmds_max = ISCSI_XMIT_CMDS_MAX;
1378 session->cmdsn = initial_cmdsn;
1379 session->exp_cmdsn = initial_cmdsn + 1;
1380 session->max_cmdsn = initial_cmdsn + 1;
1381 session->max_r2t = 1;
1382 session->tt = iscsit;
1383
1384 /* initialize SCSI PDU commands pool */
1385 if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
1386 (void***)&session->cmds,
1387 cmd_task_size + sizeof(struct iscsi_cmd_task)))
1388 goto cmdpool_alloc_fail;
1389
1390 /* pre-format cmds pool with ITT */
1391 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
1392 struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
1393
1394 if (cmd_task_size)
1395 ctask->dd_data = &ctask[1];
1396 ctask->itt = cmd_i;
1397 INIT_LIST_HEAD(&ctask->running);
1398 }
1399
1400 spin_lock_init(&session->lock);
1401
1402 /* initialize immediate command pool */
1403 if (iscsi_pool_init(&session->mgmtpool, session->mgmtpool_max,
1404 (void***)&session->mgmt_cmds,
1405 mgmt_task_size + sizeof(struct iscsi_mgmt_task)))
1406 goto mgmtpool_alloc_fail;
1407
1408
1409 /* pre-format immediate cmds pool with ITT */
1410 for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) {
1411 struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i];
1412
1413 if (mgmt_task_size)
1414 mtask->dd_data = &mtask[1];
1415 mtask->itt = ISCSI_MGMT_ITT_OFFSET + cmd_i;
1416 INIT_LIST_HEAD(&mtask->running);
1417 }
1418
1419 if (scsi_add_host(shost, NULL))
1420 goto add_host_fail;
1421
1422 if (!try_module_get(iscsit->owner))
1423 goto cls_session_fail;
1424
1425 cls_session = iscsi_create_session(shost, iscsit, 0);
1426 if (!cls_session)
1427 goto module_put;
1428 *(unsigned long*)shost->hostdata = (unsigned long)cls_session;
1429
1430 return cls_session;
1431
1432 module_put:
1433 module_put(iscsit->owner);
1434 cls_session_fail:
1435 scsi_remove_host(shost);
1436 add_host_fail:
1437 iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
1438 mgmtpool_alloc_fail:
1439 iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
1440 cmdpool_alloc_fail:
1441 scsi_host_put(shost);
1442 return NULL;
1443 }
1444 EXPORT_SYMBOL_GPL(iscsi_session_setup);
1445
1446 /**
1447 * iscsi_session_teardown - destroy session, host, and cls_session
1448 * shost: scsi host
1449 *
1450 * This can be used by software iscsi_transports that allocate
1451 * a session per scsi host.
1452 **/
1453 void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
1454 {
1455 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
1456 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
1457 struct module *owner = cls_session->transport->owner;
1458
1459 scsi_remove_host(shost);
1460
1461 iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
1462 iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
1463
1464 kfree(session->targetname);
1465
1466 iscsi_destroy_session(cls_session);
1467 scsi_host_put(shost);
1468 module_put(owner);
1469 }
1470 EXPORT_SYMBOL_GPL(iscsi_session_teardown);
1471
1472 /**
1473 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
1474 * @cls_session: iscsi_cls_session
1475 * @conn_idx: cid
1476 **/
1477 struct iscsi_cls_conn *
1478 iscsi_conn_setup(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
1479 {
1480 struct iscsi_session *session = class_to_transport_session(cls_session);
1481 struct iscsi_conn *conn;
1482 struct iscsi_cls_conn *cls_conn;
1483 char *data;
1484
1485 cls_conn = iscsi_create_conn(cls_session, conn_idx);
1486 if (!cls_conn)
1487 return NULL;
1488 conn = cls_conn->dd_data;
1489 memset(conn, 0, sizeof(*conn));
1490
1491 conn->session = session;
1492 conn->cls_conn = cls_conn;
1493 conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
1494 conn->id = conn_idx;
1495 conn->exp_statsn = 0;
1496 conn->tmabort_state = TMABORT_INITIAL;
1497 INIT_LIST_HEAD(&conn->run_list);
1498 INIT_LIST_HEAD(&conn->mgmt_run_list);
1499 INIT_LIST_HEAD(&conn->xmitqueue);
1500
1501 /* initialize general immediate & non-immediate PDU commands queue */
1502 conn->immqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*),
1503 GFP_KERNEL, NULL);
1504 if (conn->immqueue == ERR_PTR(-ENOMEM))
1505 goto immqueue_alloc_fail;
1506
1507 conn->mgmtqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*),
1508 GFP_KERNEL, NULL);
1509 if (conn->mgmtqueue == ERR_PTR(-ENOMEM))
1510 goto mgmtqueue_alloc_fail;
1511
1512 INIT_WORK(&conn->xmitwork, iscsi_xmitworker);
1513
1514 /* allocate login_mtask used for the login/text sequences */
1515 spin_lock_bh(&session->lock);
1516 if (!__kfifo_get(session->mgmtpool.queue,
1517 (void*)&conn->login_mtask,
1518 sizeof(void*))) {
1519 spin_unlock_bh(&session->lock);
1520 goto login_mtask_alloc_fail;
1521 }
1522 spin_unlock_bh(&session->lock);
1523
1524 data = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN, GFP_KERNEL);
1525 if (!data)
1526 goto login_mtask_data_alloc_fail;
1527 conn->login_mtask->data = conn->data = data;
1528
1529 init_timer(&conn->tmabort_timer);
1530 mutex_init(&conn->xmitmutex);
1531 init_waitqueue_head(&conn->ehwait);
1532
1533 return cls_conn;
1534
1535 login_mtask_data_alloc_fail:
1536 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
1537 sizeof(void*));
1538 login_mtask_alloc_fail:
1539 kfifo_free(conn->mgmtqueue);
1540 mgmtqueue_alloc_fail:
1541 kfifo_free(conn->immqueue);
1542 immqueue_alloc_fail:
1543 iscsi_destroy_conn(cls_conn);
1544 return NULL;
1545 }
1546 EXPORT_SYMBOL_GPL(iscsi_conn_setup);
1547
1548 /**
1549 * iscsi_conn_teardown - teardown iscsi connection
1550 * cls_conn: iscsi class connection
1551 *
1552 * TODO: we may need to make this into a two step process
1553 * like scsi-mls remove + put host
1554 */
1555 void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
1556 {
1557 struct iscsi_conn *conn = cls_conn->dd_data;
1558 struct iscsi_session *session = conn->session;
1559 unsigned long flags;
1560
1561 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1562 mutex_lock(&conn->xmitmutex);
1563
1564 spin_lock_bh(&session->lock);
1565 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
1566 if (session->leadconn == conn) {
1567 /*
1568 * leading connection? then give up on recovery.
1569 */
1570 session->state = ISCSI_STATE_TERMINATE;
1571 wake_up(&conn->ehwait);
1572 }
1573 spin_unlock_bh(&session->lock);
1574
1575 mutex_unlock(&conn->xmitmutex);
1576
1577 /*
1578 * Block until all in-progress commands for this connection
1579 * time out or fail.
1580 */
1581 for (;;) {
1582 spin_lock_irqsave(session->host->host_lock, flags);
1583 if (!session->host->host_busy) { /* OK for ERL == 0 */
1584 spin_unlock_irqrestore(session->host->host_lock, flags);
1585 break;
1586 }
1587 spin_unlock_irqrestore(session->host->host_lock, flags);
1588 msleep_interruptible(500);
1589 printk(KERN_INFO "iscsi: scsi conn_destroy(): host_busy %d "
1590 "host_failed %d\n", session->host->host_busy,
1591 session->host->host_failed);
1592 /*
1593 * force eh_abort() to unblock
1594 */
1595 wake_up(&conn->ehwait);
1596 }
1597
1598 /* flush queued up work because we free the connection below */
1599 scsi_flush_work(session->host);
1600
1601 spin_lock_bh(&session->lock);
1602 kfree(conn->data);
1603 kfree(conn->persistent_address);
1604 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
1605 sizeof(void*));
1606 if (session->leadconn == conn) {
1607 session->leadconn = NULL;
1608 /* no connections exits.. reset sequencing */
1609 session->cmdsn = session->max_cmdsn = session->exp_cmdsn = 1;
1610 }
1611 spin_unlock_bh(&session->lock);
1612
1613 kfifo_free(conn->immqueue);
1614 kfifo_free(conn->mgmtqueue);
1615
1616 iscsi_destroy_conn(cls_conn);
1617 }
1618 EXPORT_SYMBOL_GPL(iscsi_conn_teardown);
1619
1620 int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
1621 {
1622 struct iscsi_conn *conn = cls_conn->dd_data;
1623 struct iscsi_session *session = conn->session;
1624
1625 if (!session) {
1626 printk(KERN_ERR "iscsi: can't start unbound connection\n");
1627 return -EPERM;
1628 }
1629
1630 if ((session->imm_data_en || !session->initial_r2t_en) &&
1631 session->first_burst > session->max_burst) {
1632 printk("iscsi: invalid burst lengths: "
1633 "first_burst %d max_burst %d\n",
1634 session->first_burst, session->max_burst);
1635 return -EINVAL;
1636 }
1637
1638 spin_lock_bh(&session->lock);
1639 conn->c_stage = ISCSI_CONN_STARTED;
1640 session->state = ISCSI_STATE_LOGGED_IN;
1641
1642 switch(conn->stop_stage) {
1643 case STOP_CONN_RECOVER:
1644 /*
1645 * unblock eh_abort() if it is blocked. re-try all
1646 * commands after successful recovery
1647 */
1648 conn->stop_stage = 0;
1649 conn->tmabort_state = TMABORT_INITIAL;
1650 session->age++;
1651 spin_unlock_bh(&session->lock);
1652
1653 iscsi_unblock_session(session_to_cls(session));
1654 wake_up(&conn->ehwait);
1655 return 0;
1656 case STOP_CONN_TERM:
1657 conn->stop_stage = 0;
1658 break;
1659 default:
1660 break;
1661 }
1662 spin_unlock_bh(&session->lock);
1663
1664 return 0;
1665 }
1666 EXPORT_SYMBOL_GPL(iscsi_conn_start);
1667
1668 static void
1669 flush_control_queues(struct iscsi_session *session, struct iscsi_conn *conn)
1670 {
1671 struct iscsi_mgmt_task *mtask, *tmp;
1672
1673 /* handle pending */
1674 while (__kfifo_get(conn->immqueue, (void*)&mtask, sizeof(void*)) ||
1675 __kfifo_get(conn->mgmtqueue, (void*)&mtask, sizeof(void*))) {
1676 if (mtask == conn->login_mtask)
1677 continue;
1678 debug_scsi("flushing pending mgmt task itt 0x%x\n", mtask->itt);
1679 __kfifo_put(session->mgmtpool.queue, (void*)&mtask,
1680 sizeof(void*));
1681 }
1682
1683 /* handle running */
1684 list_for_each_entry_safe(mtask, tmp, &conn->mgmt_run_list, running) {
1685 debug_scsi("flushing running mgmt task itt 0x%x\n", mtask->itt);
1686 list_del(&mtask->running);
1687
1688 if (mtask == conn->login_mtask)
1689 continue;
1690 __kfifo_put(session->mgmtpool.queue, (void*)&mtask,
1691 sizeof(void*));
1692 }
1693
1694 conn->mtask = NULL;
1695 }
1696
1697 /* Fail commands. Mutex and session lock held and recv side suspended */
1698 static void fail_all_commands(struct iscsi_conn *conn)
1699 {
1700 struct iscsi_cmd_task *ctask, *tmp;
1701
1702 /* flush pending */
1703 list_for_each_entry_safe(ctask, tmp, &conn->xmitqueue, running) {
1704 debug_scsi("failing pending sc %p itt 0x%x\n", ctask->sc,
1705 ctask->itt);
1706 fail_command(conn, ctask, DID_BUS_BUSY << 16);
1707 }
1708
1709 /* fail all other running */
1710 list_for_each_entry_safe(ctask, tmp, &conn->run_list, running) {
1711 debug_scsi("failing in progress sc %p itt 0x%x\n",
1712 ctask->sc, ctask->itt);
1713 fail_command(conn, ctask, DID_BUS_BUSY << 16);
1714 }
1715
1716 conn->ctask = NULL;
1717 }
1718
1719 static void iscsi_start_session_recovery(struct iscsi_session *session,
1720 struct iscsi_conn *conn, int flag)
1721 {
1722 int old_stop_stage;
1723
1724 spin_lock_bh(&session->lock);
1725 if (conn->stop_stage == STOP_CONN_TERM) {
1726 spin_unlock_bh(&session->lock);
1727 return;
1728 }
1729
1730 /*
1731 * When this is called for the in_login state, we only want to clean
1732 * up the login task and connection. We do not need to block and set
1733 * the recovery state again
1734 */
1735 if (flag == STOP_CONN_TERM)
1736 session->state = ISCSI_STATE_TERMINATE;
1737 else if (conn->stop_stage != STOP_CONN_RECOVER)
1738 session->state = ISCSI_STATE_IN_RECOVERY;
1739
1740 old_stop_stage = conn->stop_stage;
1741 conn->stop_stage = flag;
1742 conn->c_stage = ISCSI_CONN_STOPPED;
1743 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1744 spin_unlock_bh(&session->lock);
1745
1746 write_lock_bh(conn->recv_lock);
1747 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
1748 write_unlock_bh(conn->recv_lock);
1749
1750 mutex_lock(&conn->xmitmutex);
1751 /*
1752 * for connection level recovery we should not calculate
1753 * header digest. conn->hdr_size used for optimization
1754 * in hdr_extract() and will be re-negotiated at
1755 * set_param() time.
1756 */
1757 if (flag == STOP_CONN_RECOVER) {
1758 conn->hdrdgst_en = 0;
1759 conn->datadgst_en = 0;
1760 if (session->state == ISCSI_STATE_IN_RECOVERY &&
1761 old_stop_stage != STOP_CONN_RECOVER) {
1762 debug_scsi("blocking session\n");
1763 iscsi_block_session(session_to_cls(session));
1764 }
1765 }
1766
1767 /*
1768 * flush queues.
1769 */
1770 spin_lock_bh(&session->lock);
1771 fail_all_commands(conn);
1772 flush_control_queues(session, conn);
1773 spin_unlock_bh(&session->lock);
1774
1775 mutex_unlock(&conn->xmitmutex);
1776 }
1777
1778 void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
1779 {
1780 struct iscsi_conn *conn = cls_conn->dd_data;
1781 struct iscsi_session *session = conn->session;
1782
1783 switch (flag) {
1784 case STOP_CONN_RECOVER:
1785 case STOP_CONN_TERM:
1786 iscsi_start_session_recovery(session, conn, flag);
1787 break;
1788 default:
1789 printk(KERN_ERR "iscsi: invalid stop flag %d\n", flag);
1790 }
1791 }
1792 EXPORT_SYMBOL_GPL(iscsi_conn_stop);
1793
1794 int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
1795 struct iscsi_cls_conn *cls_conn, int is_leading)
1796 {
1797 struct iscsi_session *session = class_to_transport_session(cls_session);
1798 struct iscsi_conn *conn = cls_conn->dd_data;
1799
1800 spin_lock_bh(&session->lock);
1801 if (is_leading)
1802 session->leadconn = conn;
1803 spin_unlock_bh(&session->lock);
1804
1805 /*
1806 * Unblock xmitworker(), Login Phase will pass through.
1807 */
1808 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
1809 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1810 return 0;
1811 }
1812 EXPORT_SYMBOL_GPL(iscsi_conn_bind);
1813
1814
1815 int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
1816 enum iscsi_param param, char *buf, int buflen)
1817 {
1818 struct iscsi_conn *conn = cls_conn->dd_data;
1819 struct iscsi_session *session = conn->session;
1820 uint32_t value;
1821
1822 switch(param) {
1823 case ISCSI_PARAM_MAX_RECV_DLENGTH:
1824 sscanf(buf, "%d", &conn->max_recv_dlength);
1825 break;
1826 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
1827 sscanf(buf, "%d", &conn->max_xmit_dlength);
1828 break;
1829 case ISCSI_PARAM_HDRDGST_EN:
1830 sscanf(buf, "%d", &conn->hdrdgst_en);
1831 break;
1832 case ISCSI_PARAM_DATADGST_EN:
1833 sscanf(buf, "%d", &conn->datadgst_en);
1834 break;
1835 case ISCSI_PARAM_INITIAL_R2T_EN:
1836 sscanf(buf, "%d", &session->initial_r2t_en);
1837 break;
1838 case ISCSI_PARAM_MAX_R2T:
1839 sscanf(buf, "%d", &session->max_r2t);
1840 break;
1841 case ISCSI_PARAM_IMM_DATA_EN:
1842 sscanf(buf, "%d", &session->imm_data_en);
1843 break;
1844 case ISCSI_PARAM_FIRST_BURST:
1845 sscanf(buf, "%d", &session->first_burst);
1846 break;
1847 case ISCSI_PARAM_MAX_BURST:
1848 sscanf(buf, "%d", &session->max_burst);
1849 break;
1850 case ISCSI_PARAM_PDU_INORDER_EN:
1851 sscanf(buf, "%d", &session->pdu_inorder_en);
1852 break;
1853 case ISCSI_PARAM_DATASEQ_INORDER_EN:
1854 sscanf(buf, "%d", &session->dataseq_inorder_en);
1855 break;
1856 case ISCSI_PARAM_ERL:
1857 sscanf(buf, "%d", &session->erl);
1858 break;
1859 case ISCSI_PARAM_IFMARKER_EN:
1860 sscanf(buf, "%d", &value);
1861 BUG_ON(value);
1862 break;
1863 case ISCSI_PARAM_OFMARKER_EN:
1864 sscanf(buf, "%d", &value);
1865 BUG_ON(value);
1866 break;
1867 case ISCSI_PARAM_EXP_STATSN:
1868 sscanf(buf, "%u", &conn->exp_statsn);
1869 break;
1870 case ISCSI_PARAM_TARGET_NAME:
1871 /* this should not change between logins */
1872 if (session->targetname)
1873 break;
1874
1875 session->targetname = kstrdup(buf, GFP_KERNEL);
1876 if (!session->targetname)
1877 return -ENOMEM;
1878 break;
1879 case ISCSI_PARAM_TPGT:
1880 sscanf(buf, "%d", &session->tpgt);
1881 break;
1882 case ISCSI_PARAM_PERSISTENT_PORT:
1883 sscanf(buf, "%d", &conn->persistent_port);
1884 break;
1885 case ISCSI_PARAM_PERSISTENT_ADDRESS:
1886 /*
1887 * this is the address returned in discovery so it should
1888 * not change between logins.
1889 */
1890 if (conn->persistent_address)
1891 break;
1892
1893 conn->persistent_address = kstrdup(buf, GFP_KERNEL);
1894 if (!conn->persistent_address)
1895 return -ENOMEM;
1896 break;
1897 default:
1898 return -ENOSYS;
1899 }
1900
1901 return 0;
1902 }
1903 EXPORT_SYMBOL_GPL(iscsi_set_param);
1904
1905 int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
1906 enum iscsi_param param, char *buf)
1907 {
1908 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
1909 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
1910 int len;
1911
1912 switch(param) {
1913 case ISCSI_PARAM_INITIAL_R2T_EN:
1914 len = sprintf(buf, "%d\n", session->initial_r2t_en);
1915 break;
1916 case ISCSI_PARAM_MAX_R2T:
1917 len = sprintf(buf, "%hu\n", session->max_r2t);
1918 break;
1919 case ISCSI_PARAM_IMM_DATA_EN:
1920 len = sprintf(buf, "%d\n", session->imm_data_en);
1921 break;
1922 case ISCSI_PARAM_FIRST_BURST:
1923 len = sprintf(buf, "%u\n", session->first_burst);
1924 break;
1925 case ISCSI_PARAM_MAX_BURST:
1926 len = sprintf(buf, "%u\n", session->max_burst);
1927 break;
1928 case ISCSI_PARAM_PDU_INORDER_EN:
1929 len = sprintf(buf, "%d\n", session->pdu_inorder_en);
1930 break;
1931 case ISCSI_PARAM_DATASEQ_INORDER_EN:
1932 len = sprintf(buf, "%d\n", session->dataseq_inorder_en);
1933 break;
1934 case ISCSI_PARAM_ERL:
1935 len = sprintf(buf, "%d\n", session->erl);
1936 break;
1937 case ISCSI_PARAM_TARGET_NAME:
1938 len = sprintf(buf, "%s\n", session->targetname);
1939 break;
1940 case ISCSI_PARAM_TPGT:
1941 len = sprintf(buf, "%d\n", session->tpgt);
1942 break;
1943 default:
1944 return -ENOSYS;
1945 }
1946
1947 return len;
1948 }
1949 EXPORT_SYMBOL_GPL(iscsi_session_get_param);
1950
1951 int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
1952 enum iscsi_param param, char *buf)
1953 {
1954 struct iscsi_conn *conn = cls_conn->dd_data;
1955 int len;
1956
1957 switch(param) {
1958 case ISCSI_PARAM_MAX_RECV_DLENGTH:
1959 len = sprintf(buf, "%u\n", conn->max_recv_dlength);
1960 break;
1961 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
1962 len = sprintf(buf, "%u\n", conn->max_xmit_dlength);
1963 break;
1964 case ISCSI_PARAM_HDRDGST_EN:
1965 len = sprintf(buf, "%d\n", conn->hdrdgst_en);
1966 break;
1967 case ISCSI_PARAM_DATADGST_EN:
1968 len = sprintf(buf, "%d\n", conn->datadgst_en);
1969 break;
1970 case ISCSI_PARAM_IFMARKER_EN:
1971 len = sprintf(buf, "%d\n", conn->ifmarker_en);
1972 break;
1973 case ISCSI_PARAM_OFMARKER_EN:
1974 len = sprintf(buf, "%d\n", conn->ofmarker_en);
1975 break;
1976 case ISCSI_PARAM_EXP_STATSN:
1977 len = sprintf(buf, "%u\n", conn->exp_statsn);
1978 break;
1979 case ISCSI_PARAM_PERSISTENT_PORT:
1980 len = sprintf(buf, "%d\n", conn->persistent_port);
1981 break;
1982 case ISCSI_PARAM_PERSISTENT_ADDRESS:
1983 len = sprintf(buf, "%s\n", conn->persistent_address);
1984 break;
1985 default:
1986 return -ENOSYS;
1987 }
1988
1989 return len;
1990 }
1991 EXPORT_SYMBOL_GPL(iscsi_conn_get_param);
1992
1993 MODULE_AUTHOR("Mike Christie");
1994 MODULE_DESCRIPTION("iSCSI library functions");
1995 MODULE_LICENSE("GPL");
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