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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[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 = ctask->itt | (conn->id << ISCSI_CID_SHIFT) |
117 (session->age << ISCSI_AGE_SHIFT);
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 int 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 = (data[0] << 8) | data[1];
274 if (datalen < senselen)
275 goto invalid_datalen;
276
277 memcpy(sc->sense_buffer, data + 2,
278 min(senselen, SCSI_SENSE_BUFFERSIZE));
279 debug_scsi("copied %d bytes of sense\n",
280 min(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 = rejected_pdu.itt & ISCSI_ITT_MASK;
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 != cpu_to_be32(ISCSI_RESERVED_TAG))
371 itt = hdr->itt & ISCSI_ITT_MASK;
372 else
373 itt = hdr->itt;
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 != 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 == ISCSI_RESERVED_TAG) {
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 == 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 /* we need sth like iscsi_async_event_rsp() */
485 rc = ISCSI_ERR_BAD_OPCODE;
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 != cpu_to_be32(ISCSI_RESERVED_TAG)) {
520 if ((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", hdr->itt,
524 session->age & ISCSI_AGE_MASK);
525 return ISCSI_ERR_BAD_ITT;
526 }
527
528 if ((hdr->itt & ISCSI_CID_MASK) !=
529 (conn->id << ISCSI_CID_SHIFT)) {
530 printk(KERN_ERR "iscsi: received itt %x, expected "
531 "CID (%x)\n", hdr->itt, conn->id);
532 return ISCSI_ERR_BAD_ITT;
533 }
534 itt = hdr->itt & ISCSI_ITT_MASK;
535 } else
536 itt = hdr->itt;
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 /**
582 * iscsi_data_xmit - xmit any command into the scheduled connection
583 * @conn: iscsi connection
584 *
585 * Notes:
586 * The function can return -EAGAIN in which case the caller must
587 * re-schedule it again later or recover. '0' return code means
588 * successful xmit.
589 **/
590 static int iscsi_data_xmit(struct iscsi_conn *conn)
591 {
592 struct iscsi_transport *tt;
593 int rc = 0;
594
595 if (unlikely(conn->suspend_tx)) {
596 debug_scsi("conn %d Tx suspended!\n", conn->id);
597 return -ENODATA;
598 }
599 tt = conn->session->tt;
600
601 /*
602 * Transmit in the following order:
603 *
604 * 1) un-finished xmit (ctask or mtask)
605 * 2) immediate control PDUs
606 * 3) write data
607 * 4) SCSI commands
608 * 5) non-immediate control PDUs
609 *
610 * No need to lock around __kfifo_get as long as
611 * there's one producer and one consumer.
612 */
613
614 BUG_ON(conn->ctask && conn->mtask);
615
616 if (conn->ctask) {
617 iscsi_get_ctask(conn->ctask);
618 rc = tt->xmit_cmd_task(conn, conn->ctask);
619 iscsi_put_ctask(conn->ctask);
620 if (rc)
621 goto again;
622 /* done with this in-progress ctask */
623 conn->ctask = NULL;
624 }
625 if (conn->mtask) {
626 rc = tt->xmit_mgmt_task(conn, conn->mtask);
627 if (rc)
628 goto again;
629 /* done with this in-progress mtask */
630 conn->mtask = NULL;
631 }
632
633 /* process immediate first */
634 if (unlikely(__kfifo_len(conn->immqueue))) {
635 while (__kfifo_get(conn->immqueue, (void*)&conn->mtask,
636 sizeof(void*))) {
637 spin_lock_bh(&conn->session->lock);
638 list_add_tail(&conn->mtask->running,
639 &conn->mgmt_run_list);
640 spin_unlock_bh(&conn->session->lock);
641 rc = tt->xmit_mgmt_task(conn, conn->mtask);
642 if (rc)
643 goto again;
644 }
645 /* done with this mtask */
646 conn->mtask = NULL;
647 }
648
649 /* process command queue */
650 spin_lock_bh(&conn->session->lock);
651 while (!list_empty(&conn->xmitqueue)) {
652 /*
653 * iscsi tcp may readd the task to the xmitqueue to send
654 * write data
655 */
656 conn->ctask = list_entry(conn->xmitqueue.next,
657 struct iscsi_cmd_task, running);
658 conn->ctask->state = ISCSI_TASK_RUNNING;
659 list_move_tail(conn->xmitqueue.next, &conn->run_list);
660 __iscsi_get_ctask(conn->ctask);
661 spin_unlock_bh(&conn->session->lock);
662
663 rc = tt->xmit_cmd_task(conn, conn->ctask);
664 if (rc)
665 goto again;
666
667 spin_lock_bh(&conn->session->lock);
668 __iscsi_put_ctask(conn->ctask);
669 if (rc) {
670 spin_unlock_bh(&conn->session->lock);
671 goto again;
672 }
673 }
674 spin_unlock_bh(&conn->session->lock);
675 /* done with this ctask */
676 conn->ctask = NULL;
677
678 /* process the rest control plane PDUs, if any */
679 if (unlikely(__kfifo_len(conn->mgmtqueue))) {
680 while (__kfifo_get(conn->mgmtqueue, (void*)&conn->mtask,
681 sizeof(void*))) {
682 spin_lock_bh(&conn->session->lock);
683 list_add_tail(&conn->mtask->running,
684 &conn->mgmt_run_list);
685 spin_unlock_bh(&conn->session->lock);
686 rc = tt->xmit_mgmt_task(conn, conn->mtask);
687 if (rc)
688 goto again;
689 }
690 /* done with this mtask */
691 conn->mtask = NULL;
692 }
693
694 return -ENODATA;
695
696 again:
697 if (unlikely(conn->suspend_tx))
698 return -ENODATA;
699
700 return rc;
701 }
702
703 static void iscsi_xmitworker(void *data)
704 {
705 struct iscsi_conn *conn = data;
706 int rc;
707 /*
708 * serialize Xmit worker on a per-connection basis.
709 */
710 mutex_lock(&conn->xmitmutex);
711 do {
712 rc = iscsi_data_xmit(conn);
713 } while (rc >= 0 || rc == -EAGAIN);
714 mutex_unlock(&conn->xmitmutex);
715 }
716
717 enum {
718 FAILURE_BAD_HOST = 1,
719 FAILURE_SESSION_FAILED,
720 FAILURE_SESSION_FREED,
721 FAILURE_WINDOW_CLOSED,
722 FAILURE_OOM,
723 FAILURE_SESSION_TERMINATE,
724 FAILURE_SESSION_IN_RECOVERY,
725 FAILURE_SESSION_RECOVERY_TIMEOUT,
726 };
727
728 int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
729 {
730 struct Scsi_Host *host;
731 int reason = 0;
732 struct iscsi_session *session;
733 struct iscsi_conn *conn;
734 struct iscsi_cmd_task *ctask = NULL;
735
736 sc->scsi_done = done;
737 sc->result = 0;
738 sc->SCp.ptr = NULL;
739
740 host = sc->device->host;
741 session = iscsi_hostdata(host->hostdata);
742
743 spin_lock(&session->lock);
744
745 /*
746 * ISCSI_STATE_FAILED is a temp. state. The recovery
747 * code will decide what is best to do with command queued
748 * during this time
749 */
750 if (session->state != ISCSI_STATE_LOGGED_IN &&
751 session->state != ISCSI_STATE_FAILED) {
752 /*
753 * to handle the race between when we set the recovery state
754 * and block the session we requeue here (commands could
755 * be entering our queuecommand while a block is starting
756 * up because the block code is not locked)
757 */
758 if (session->state == ISCSI_STATE_IN_RECOVERY) {
759 reason = FAILURE_SESSION_IN_RECOVERY;
760 goto reject;
761 }
762
763 if (session->state == ISCSI_STATE_RECOVERY_FAILED)
764 reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
765 else if (session->state == ISCSI_STATE_TERMINATE)
766 reason = FAILURE_SESSION_TERMINATE;
767 else
768 reason = FAILURE_SESSION_FREED;
769 goto fault;
770 }
771
772 /*
773 * Check for iSCSI window and take care of CmdSN wrap-around
774 */
775 if ((int)(session->max_cmdsn - session->cmdsn) < 0) {
776 reason = FAILURE_WINDOW_CLOSED;
777 goto reject;
778 }
779
780 conn = session->leadconn;
781
782 if (!__kfifo_get(session->cmdpool.queue, (void*)&ctask,
783 sizeof(void*))) {
784 reason = FAILURE_OOM;
785 goto reject;
786 }
787 sc->SCp.phase = session->age;
788 sc->SCp.ptr = (char *)ctask;
789
790 atomic_set(&ctask->refcount, 1);
791 ctask->state = ISCSI_TASK_PENDING;
792 ctask->mtask = NULL;
793 ctask->conn = conn;
794 ctask->sc = sc;
795 INIT_LIST_HEAD(&ctask->running);
796 ctask->total_length = sc->request_bufflen;
797 iscsi_prep_scsi_cmd_pdu(ctask);
798
799 session->tt->init_cmd_task(ctask);
800
801 list_add_tail(&ctask->running, &conn->xmitqueue);
802 debug_scsi(
803 "ctask enq [%s cid %d sc %p cdb 0x%x itt 0x%x len %d cmdsn %d "
804 "win %d]\n",
805 sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read",
806 conn->id, sc, sc->cmnd[0], ctask->itt, sc->request_bufflen,
807 session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1);
808 spin_unlock(&session->lock);
809
810 scsi_queue_work(host, &conn->xmitwork);
811 return 0;
812
813 reject:
814 spin_unlock(&session->lock);
815 debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason);
816 return SCSI_MLQUEUE_HOST_BUSY;
817
818 fault:
819 spin_unlock(&session->lock);
820 printk(KERN_ERR "iscsi: cmd 0x%x is not queued (%d)\n",
821 sc->cmnd[0], reason);
822 sc->result = (DID_NO_CONNECT << 16);
823 sc->resid = sc->request_bufflen;
824 sc->scsi_done(sc);
825 return 0;
826 }
827 EXPORT_SYMBOL_GPL(iscsi_queuecommand);
828
829 int iscsi_change_queue_depth(struct scsi_device *sdev, int depth)
830 {
831 if (depth > ISCSI_MAX_CMD_PER_LUN)
832 depth = ISCSI_MAX_CMD_PER_LUN;
833 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
834 return sdev->queue_depth;
835 }
836 EXPORT_SYMBOL_GPL(iscsi_change_queue_depth);
837
838 static int
839 iscsi_conn_send_generic(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
840 char *data, uint32_t data_size)
841 {
842 struct iscsi_session *session = conn->session;
843 struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
844 struct iscsi_mgmt_task *mtask;
845
846 spin_lock_bh(&session->lock);
847 if (session->state == ISCSI_STATE_TERMINATE) {
848 spin_unlock_bh(&session->lock);
849 return -EPERM;
850 }
851 if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) ||
852 hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
853 /*
854 * Login and Text are sent serially, in
855 * request-followed-by-response sequence.
856 * Same mtask can be used. Same ITT must be used.
857 * Note that login_mtask is preallocated at conn_create().
858 */
859 mtask = conn->login_mtask;
860 else {
861 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
862 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
863
864 nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
865 if (!__kfifo_get(session->mgmtpool.queue,
866 (void*)&mtask, sizeof(void*))) {
867 spin_unlock_bh(&session->lock);
868 return -ENOSPC;
869 }
870 }
871
872 /*
873 * pre-format CmdSN for outgoing PDU.
874 */
875 if (hdr->itt != cpu_to_be32(ISCSI_RESERVED_TAG)) {
876 hdr->itt = mtask->itt | (conn->id << ISCSI_CID_SHIFT) |
877 (session->age << ISCSI_AGE_SHIFT);
878 nop->cmdsn = cpu_to_be32(session->cmdsn);
879 if (conn->c_stage == ISCSI_CONN_STARTED &&
880 !(hdr->opcode & ISCSI_OP_IMMEDIATE))
881 session->cmdsn++;
882 } else
883 /* do not advance CmdSN */
884 nop->cmdsn = cpu_to_be32(session->cmdsn);
885
886 if (data_size) {
887 memcpy(mtask->data, data, data_size);
888 mtask->data_count = data_size;
889 } else
890 mtask->data_count = 0;
891
892 INIT_LIST_HEAD(&mtask->running);
893 memcpy(mtask->hdr, hdr, sizeof(struct iscsi_hdr));
894 if (session->tt->init_mgmt_task)
895 session->tt->init_mgmt_task(conn, mtask, data, data_size);
896 spin_unlock_bh(&session->lock);
897
898 debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n",
899 hdr->opcode, hdr->itt, data_size);
900
901 /*
902 * since send_pdu() could be called at least from two contexts,
903 * we need to serialize __kfifo_put, so we don't have to take
904 * additional lock on fast data-path
905 */
906 if (hdr->opcode & ISCSI_OP_IMMEDIATE)
907 __kfifo_put(conn->immqueue, (void*)&mtask, sizeof(void*));
908 else
909 __kfifo_put(conn->mgmtqueue, (void*)&mtask, sizeof(void*));
910
911 scsi_queue_work(session->host, &conn->xmitwork);
912 return 0;
913 }
914
915 int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr,
916 char *data, uint32_t data_size)
917 {
918 struct iscsi_conn *conn = cls_conn->dd_data;
919 int rc;
920
921 mutex_lock(&conn->xmitmutex);
922 rc = iscsi_conn_send_generic(conn, hdr, data, data_size);
923 mutex_unlock(&conn->xmitmutex);
924
925 return rc;
926 }
927 EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu);
928
929 void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
930 {
931 struct iscsi_session *session = class_to_transport_session(cls_session);
932 struct iscsi_conn *conn = session->leadconn;
933
934 spin_lock_bh(&session->lock);
935 if (session->state != ISCSI_STATE_LOGGED_IN) {
936 session->state = ISCSI_STATE_RECOVERY_FAILED;
937 if (conn)
938 wake_up(&conn->ehwait);
939 }
940 spin_unlock_bh(&session->lock);
941 }
942 EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
943
944 int iscsi_eh_host_reset(struct scsi_cmnd *sc)
945 {
946 struct Scsi_Host *host = sc->device->host;
947 struct iscsi_session *session = iscsi_hostdata(host->hostdata);
948 struct iscsi_conn *conn = session->leadconn;
949 int fail_session = 0;
950
951 spin_lock_bh(&session->lock);
952 if (session->state == ISCSI_STATE_TERMINATE) {
953 failed:
954 debug_scsi("failing host reset: session terminated "
955 "[CID %d age %d]", conn->id, session->age);
956 spin_unlock_bh(&session->lock);
957 return FAILED;
958 }
959
960 if (sc->SCp.phase == session->age) {
961 debug_scsi("failing connection CID %d due to SCSI host reset",
962 conn->id);
963 fail_session = 1;
964 }
965 spin_unlock_bh(&session->lock);
966
967 /*
968 * we drop the lock here but the leadconn cannot be destoyed while
969 * we are in the scsi eh
970 */
971 if (fail_session)
972 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
973
974 debug_scsi("iscsi_eh_host_reset wait for relogin\n");
975 wait_event_interruptible(conn->ehwait,
976 session->state == ISCSI_STATE_TERMINATE ||
977 session->state == ISCSI_STATE_LOGGED_IN ||
978 session->state == ISCSI_STATE_RECOVERY_FAILED);
979 if (signal_pending(current))
980 flush_signals(current);
981
982 spin_lock_bh(&session->lock);
983 if (session->state == ISCSI_STATE_LOGGED_IN)
984 printk(KERN_INFO "iscsi: host reset succeeded\n");
985 else
986 goto failed;
987 spin_unlock_bh(&session->lock);
988
989 return SUCCESS;
990 }
991 EXPORT_SYMBOL_GPL(iscsi_eh_host_reset);
992
993 static void iscsi_tmabort_timedout(unsigned long data)
994 {
995 struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)data;
996 struct iscsi_conn *conn = ctask->conn;
997 struct iscsi_session *session = conn->session;
998
999 spin_lock(&session->lock);
1000 if (conn->tmabort_state == TMABORT_INITIAL) {
1001 conn->tmabort_state = TMABORT_TIMEDOUT;
1002 debug_scsi("tmabort timedout [sc %p itt 0x%x]\n",
1003 ctask->sc, ctask->itt);
1004 /* unblock eh_abort() */
1005 wake_up(&conn->ehwait);
1006 }
1007 spin_unlock(&session->lock);
1008 }
1009
1010 /* must be called with the mutex lock */
1011 static int iscsi_exec_abort_task(struct scsi_cmnd *sc,
1012 struct iscsi_cmd_task *ctask)
1013 {
1014 struct iscsi_conn *conn = ctask->conn;
1015 struct iscsi_session *session = conn->session;
1016 struct iscsi_tm *hdr = &conn->tmhdr;
1017 int rc;
1018
1019 /*
1020 * ctask timed out but session is OK requests must be serialized.
1021 */
1022 memset(hdr, 0, sizeof(struct iscsi_tm));
1023 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
1024 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK;
1025 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
1026 memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
1027 hdr->rtt = ctask->hdr->itt;
1028 hdr->refcmdsn = ctask->hdr->cmdsn;
1029
1030 rc = iscsi_conn_send_generic(conn, (struct iscsi_hdr *)hdr,
1031 NULL, 0);
1032 if (rc) {
1033 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1034 debug_scsi("abort sent failure [itt 0x%x] %d", ctask->itt, rc);
1035 return rc;
1036 }
1037
1038 debug_scsi("abort sent [itt 0x%x]\n", ctask->itt);
1039
1040 spin_lock_bh(&session->lock);
1041 ctask->mtask = (struct iscsi_mgmt_task *)
1042 session->mgmt_cmds[(hdr->itt & ISCSI_ITT_MASK) -
1043 ISCSI_MGMT_ITT_OFFSET];
1044
1045 if (conn->tmabort_state == TMABORT_INITIAL) {
1046 conn->tmfcmd_pdus_cnt++;
1047 conn->tmabort_timer.expires = 10*HZ + jiffies;
1048 conn->tmabort_timer.function = iscsi_tmabort_timedout;
1049 conn->tmabort_timer.data = (unsigned long)ctask;
1050 add_timer(&conn->tmabort_timer);
1051 debug_scsi("abort set timeout [itt 0x%x]", ctask->itt);
1052 }
1053 spin_unlock_bh(&session->lock);
1054 mutex_unlock(&conn->xmitmutex);
1055
1056 /*
1057 * block eh thread until:
1058 *
1059 * 1) abort response
1060 * 2) abort timeout
1061 * 3) session is terminated or restarted or userspace has
1062 * given up on recovery
1063 */
1064 wait_event_interruptible(conn->ehwait,
1065 sc->SCp.phase != session->age ||
1066 session->state != ISCSI_STATE_LOGGED_IN ||
1067 conn->tmabort_state != TMABORT_INITIAL);
1068 if (signal_pending(current))
1069 flush_signals(current);
1070 del_timer_sync(&conn->tmabort_timer);
1071
1072 mutex_lock(&conn->xmitmutex);
1073 return 0;
1074 }
1075
1076 /*
1077 * xmit mutex and session lock must be held
1078 */
1079 static struct iscsi_mgmt_task *
1080 iscsi_remove_mgmt_task(struct kfifo *fifo, uint32_t itt)
1081 {
1082 int i, nr_tasks = __kfifo_len(fifo) / sizeof(void*);
1083 struct iscsi_mgmt_task *task;
1084
1085 debug_scsi("searching %d tasks\n", nr_tasks);
1086
1087 for (i = 0; i < nr_tasks; i++) {
1088 __kfifo_get(fifo, (void*)&task, sizeof(void*));
1089 debug_scsi("check task %u\n", task->itt);
1090
1091 if (task->itt == itt) {
1092 debug_scsi("matched task\n");
1093 return task;
1094 }
1095
1096 __kfifo_put(fifo, (void*)&task, sizeof(void*));
1097 }
1098 return NULL;
1099 }
1100
1101 static int iscsi_ctask_mtask_cleanup(struct iscsi_cmd_task *ctask)
1102 {
1103 struct iscsi_conn *conn = ctask->conn;
1104 struct iscsi_session *session = conn->session;
1105
1106 if (!ctask->mtask)
1107 return -EINVAL;
1108
1109 if (!iscsi_remove_mgmt_task(conn->immqueue, ctask->mtask->itt))
1110 list_del(&ctask->mtask->running);
1111 __kfifo_put(session->mgmtpool.queue, (void*)&ctask->mtask,
1112 sizeof(void*));
1113 ctask->mtask = NULL;
1114 return 0;
1115 }
1116
1117 /*
1118 * session lock and xmitmutex must be held
1119 */
1120 static void fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
1121 int err)
1122 {
1123 struct scsi_cmnd *sc;
1124
1125 sc = ctask->sc;
1126 if (!sc)
1127 return;
1128
1129 conn->session->tt->cleanup_cmd_task(conn, ctask);
1130 iscsi_ctask_mtask_cleanup(ctask);
1131
1132 sc->result = err;
1133 sc->resid = sc->request_bufflen;
1134 /* release ref from queuecommand */
1135 __iscsi_put_ctask(ctask);
1136 }
1137
1138 int iscsi_eh_abort(struct scsi_cmnd *sc)
1139 {
1140 struct iscsi_cmd_task *ctask;
1141 struct iscsi_conn *conn;
1142 struct iscsi_session *session;
1143 int rc;
1144
1145 /*
1146 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
1147 * got the command.
1148 */
1149 if (!sc->SCp.ptr) {
1150 debug_scsi("sc never reached iscsi layer or it completed.\n");
1151 return SUCCESS;
1152 }
1153
1154 ctask = (struct iscsi_cmd_task *)sc->SCp.ptr;
1155 conn = ctask->conn;
1156 session = conn->session;
1157
1158 conn->eh_abort_cnt++;
1159 debug_scsi("aborting [sc %p itt 0x%x]\n", sc, ctask->itt);
1160
1161 mutex_lock(&conn->xmitmutex);
1162 spin_lock_bh(&session->lock);
1163
1164 /*
1165 * If we are not logged in or we have started a new session
1166 * then let the host reset code handle this
1167 */
1168 if (session->state != ISCSI_STATE_LOGGED_IN ||
1169 sc->SCp.phase != session->age)
1170 goto failed;
1171
1172 /* ctask completed before time out */
1173 if (!ctask->sc) {
1174 spin_unlock_bh(&session->lock);
1175 debug_scsi("sc completed while abort in progress\n");
1176 goto success_rel_mutex;
1177 }
1178
1179 /* what should we do here ? */
1180 if (conn->ctask == ctask) {
1181 printk(KERN_INFO "iscsi: sc %p itt 0x%x partially sent. "
1182 "Failing abort\n", sc, ctask->itt);
1183 goto failed;
1184 }
1185
1186 if (ctask->state == ISCSI_TASK_PENDING)
1187 goto success_cleanup;
1188
1189 conn->tmabort_state = TMABORT_INITIAL;
1190
1191 spin_unlock_bh(&session->lock);
1192 rc = iscsi_exec_abort_task(sc, ctask);
1193 spin_lock_bh(&session->lock);
1194
1195 if (rc || sc->SCp.phase != session->age ||
1196 session->state != ISCSI_STATE_LOGGED_IN)
1197 goto failed;
1198 iscsi_ctask_mtask_cleanup(ctask);
1199
1200 switch (conn->tmabort_state) {
1201 case TMABORT_SUCCESS:
1202 goto success_cleanup;
1203 case TMABORT_NOT_FOUND:
1204 if (!ctask->sc) {
1205 /* ctask completed before tmf abort response */
1206 spin_unlock_bh(&session->lock);
1207 debug_scsi("sc completed while abort in progress\n");
1208 goto success_rel_mutex;
1209 }
1210 /* fall through */
1211 default:
1212 /* timedout or failed */
1213 spin_unlock_bh(&session->lock);
1214 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1215 spin_lock_bh(&session->lock);
1216 goto failed;
1217 }
1218
1219 success_cleanup:
1220 debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
1221 spin_unlock_bh(&session->lock);
1222
1223 /*
1224 * clean up task if aborted. we have the xmitmutex so grab
1225 * the recv lock as a writer
1226 */
1227 write_lock_bh(conn->recv_lock);
1228 spin_lock(&session->lock);
1229 fail_command(conn, ctask, DID_ABORT << 16);
1230 spin_unlock(&session->lock);
1231 write_unlock_bh(conn->recv_lock);
1232
1233 success_rel_mutex:
1234 mutex_unlock(&conn->xmitmutex);
1235 return SUCCESS;
1236
1237 failed:
1238 spin_unlock_bh(&session->lock);
1239 mutex_unlock(&conn->xmitmutex);
1240
1241 debug_scsi("abort failed [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
1242 return FAILED;
1243 }
1244 EXPORT_SYMBOL_GPL(iscsi_eh_abort);
1245
1246 int
1247 iscsi_pool_init(struct iscsi_queue *q, int max, void ***items, int item_size)
1248 {
1249 int i;
1250
1251 *items = kmalloc(max * sizeof(void*), GFP_KERNEL);
1252 if (*items == NULL)
1253 return -ENOMEM;
1254
1255 q->max = max;
1256 q->pool = kmalloc(max * sizeof(void*), GFP_KERNEL);
1257 if (q->pool == NULL) {
1258 kfree(*items);
1259 return -ENOMEM;
1260 }
1261
1262 q->queue = kfifo_init((void*)q->pool, max * sizeof(void*),
1263 GFP_KERNEL, NULL);
1264 if (q->queue == ERR_PTR(-ENOMEM)) {
1265 kfree(q->pool);
1266 kfree(*items);
1267 return -ENOMEM;
1268 }
1269
1270 for (i = 0; i < max; i++) {
1271 q->pool[i] = kmalloc(item_size, GFP_KERNEL);
1272 if (q->pool[i] == NULL) {
1273 int j;
1274
1275 for (j = 0; j < i; j++)
1276 kfree(q->pool[j]);
1277
1278 kfifo_free(q->queue);
1279 kfree(q->pool);
1280 kfree(*items);
1281 return -ENOMEM;
1282 }
1283 memset(q->pool[i], 0, item_size);
1284 (*items)[i] = q->pool[i];
1285 __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*));
1286 }
1287 return 0;
1288 }
1289 EXPORT_SYMBOL_GPL(iscsi_pool_init);
1290
1291 void iscsi_pool_free(struct iscsi_queue *q, void **items)
1292 {
1293 int i;
1294
1295 for (i = 0; i < q->max; i++)
1296 kfree(items[i]);
1297 kfree(q->pool);
1298 kfree(items);
1299 }
1300 EXPORT_SYMBOL_GPL(iscsi_pool_free);
1301
1302 /*
1303 * iSCSI Session's hostdata organization:
1304 *
1305 * *------------------* <== hostdata_session(host->hostdata)
1306 * | ptr to class sess|
1307 * |------------------| <== iscsi_hostdata(host->hostdata)
1308 * | iscsi_session |
1309 * *------------------*
1310 */
1311
1312 #define hostdata_privsize(_sz) (sizeof(unsigned long) + _sz + \
1313 _sz % sizeof(unsigned long))
1314
1315 #define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata))
1316
1317 /**
1318 * iscsi_session_setup - create iscsi cls session and host and session
1319 * @scsit: scsi transport template
1320 * @iscsit: iscsi transport template
1321 * @initial_cmdsn: initial CmdSN
1322 * @hostno: host no allocated
1323 *
1324 * This can be used by software iscsi_transports that allocate
1325 * a session per scsi host.
1326 **/
1327 struct iscsi_cls_session *
1328 iscsi_session_setup(struct iscsi_transport *iscsit,
1329 struct scsi_transport_template *scsit,
1330 int cmd_task_size, int mgmt_task_size,
1331 uint32_t initial_cmdsn, uint32_t *hostno)
1332 {
1333 struct Scsi_Host *shost;
1334 struct iscsi_session *session;
1335 struct iscsi_cls_session *cls_session;
1336 int cmd_i;
1337
1338 shost = scsi_host_alloc(iscsit->host_template,
1339 hostdata_privsize(sizeof(*session)));
1340 if (!shost)
1341 return NULL;
1342
1343 shost->max_id = 1;
1344 shost->max_channel = 0;
1345 shost->max_lun = iscsit->max_lun;
1346 shost->max_cmd_len = iscsit->max_cmd_len;
1347 shost->transportt = scsit;
1348 shost->transportt->create_work_queue = 1;
1349 *hostno = shost->host_no;
1350
1351 session = iscsi_hostdata(shost->hostdata);
1352 memset(session, 0, sizeof(struct iscsi_session));
1353 session->host = shost;
1354 session->state = ISCSI_STATE_FREE;
1355 session->mgmtpool_max = ISCSI_MGMT_CMDS_MAX;
1356 session->cmds_max = ISCSI_XMIT_CMDS_MAX;
1357 session->cmdsn = initial_cmdsn;
1358 session->exp_cmdsn = initial_cmdsn + 1;
1359 session->max_cmdsn = initial_cmdsn + 1;
1360 session->max_r2t = 1;
1361 session->tt = iscsit;
1362
1363 /* initialize SCSI PDU commands pool */
1364 if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
1365 (void***)&session->cmds,
1366 cmd_task_size + sizeof(struct iscsi_cmd_task)))
1367 goto cmdpool_alloc_fail;
1368
1369 /* pre-format cmds pool with ITT */
1370 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
1371 struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
1372
1373 if (cmd_task_size)
1374 ctask->dd_data = &ctask[1];
1375 ctask->itt = cmd_i;
1376 INIT_LIST_HEAD(&ctask->running);
1377 }
1378
1379 spin_lock_init(&session->lock);
1380 INIT_LIST_HEAD(&session->connections);
1381
1382 /* initialize immediate command pool */
1383 if (iscsi_pool_init(&session->mgmtpool, session->mgmtpool_max,
1384 (void***)&session->mgmt_cmds,
1385 mgmt_task_size + sizeof(struct iscsi_mgmt_task)))
1386 goto mgmtpool_alloc_fail;
1387
1388
1389 /* pre-format immediate cmds pool with ITT */
1390 for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) {
1391 struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i];
1392
1393 if (mgmt_task_size)
1394 mtask->dd_data = &mtask[1];
1395 mtask->itt = ISCSI_MGMT_ITT_OFFSET + cmd_i;
1396 INIT_LIST_HEAD(&mtask->running);
1397 }
1398
1399 if (scsi_add_host(shost, NULL))
1400 goto add_host_fail;
1401
1402 if (!try_module_get(iscsit->owner))
1403 goto cls_session_fail;
1404
1405 cls_session = iscsi_create_session(shost, iscsit, 0);
1406 if (!cls_session)
1407 goto module_put;
1408 *(unsigned long*)shost->hostdata = (unsigned long)cls_session;
1409
1410 return cls_session;
1411
1412 module_put:
1413 module_put(iscsit->owner);
1414 cls_session_fail:
1415 scsi_remove_host(shost);
1416 add_host_fail:
1417 iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
1418 mgmtpool_alloc_fail:
1419 iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
1420 cmdpool_alloc_fail:
1421 scsi_host_put(shost);
1422 return NULL;
1423 }
1424 EXPORT_SYMBOL_GPL(iscsi_session_setup);
1425
1426 /**
1427 * iscsi_session_teardown - destroy session, host, and cls_session
1428 * shost: scsi host
1429 *
1430 * This can be used by software iscsi_transports that allocate
1431 * a session per scsi host.
1432 **/
1433 void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
1434 {
1435 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
1436 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
1437 struct module *owner = cls_session->transport->owner;
1438
1439 scsi_remove_host(shost);
1440
1441 iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
1442 iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
1443
1444 kfree(session->targetname);
1445
1446 iscsi_destroy_session(cls_session);
1447 scsi_host_put(shost);
1448 module_put(owner);
1449 }
1450 EXPORT_SYMBOL_GPL(iscsi_session_teardown);
1451
1452 /**
1453 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
1454 * @cls_session: iscsi_cls_session
1455 * @conn_idx: cid
1456 **/
1457 struct iscsi_cls_conn *
1458 iscsi_conn_setup(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
1459 {
1460 struct iscsi_session *session = class_to_transport_session(cls_session);
1461 struct iscsi_conn *conn;
1462 struct iscsi_cls_conn *cls_conn;
1463 char *data;
1464
1465 cls_conn = iscsi_create_conn(cls_session, conn_idx);
1466 if (!cls_conn)
1467 return NULL;
1468 conn = cls_conn->dd_data;
1469 memset(conn, 0, sizeof(*conn));
1470
1471 conn->session = session;
1472 conn->cls_conn = cls_conn;
1473 conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
1474 conn->id = conn_idx;
1475 conn->exp_statsn = 0;
1476 conn->tmabort_state = TMABORT_INITIAL;
1477 INIT_LIST_HEAD(&conn->run_list);
1478 INIT_LIST_HEAD(&conn->mgmt_run_list);
1479 INIT_LIST_HEAD(&conn->xmitqueue);
1480
1481 /* initialize general immediate & non-immediate PDU commands queue */
1482 conn->immqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*),
1483 GFP_KERNEL, NULL);
1484 if (conn->immqueue == ERR_PTR(-ENOMEM))
1485 goto immqueue_alloc_fail;
1486
1487 conn->mgmtqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*),
1488 GFP_KERNEL, NULL);
1489 if (conn->mgmtqueue == ERR_PTR(-ENOMEM))
1490 goto mgmtqueue_alloc_fail;
1491
1492 INIT_WORK(&conn->xmitwork, iscsi_xmitworker, conn);
1493
1494 /* allocate login_mtask used for the login/text sequences */
1495 spin_lock_bh(&session->lock);
1496 if (!__kfifo_get(session->mgmtpool.queue,
1497 (void*)&conn->login_mtask,
1498 sizeof(void*))) {
1499 spin_unlock_bh(&session->lock);
1500 goto login_mtask_alloc_fail;
1501 }
1502 spin_unlock_bh(&session->lock);
1503
1504 data = kmalloc(DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH, GFP_KERNEL);
1505 if (!data)
1506 goto login_mtask_data_alloc_fail;
1507 conn->login_mtask->data = conn->data = data;
1508
1509 init_timer(&conn->tmabort_timer);
1510 mutex_init(&conn->xmitmutex);
1511 init_waitqueue_head(&conn->ehwait);
1512
1513 return cls_conn;
1514
1515 login_mtask_data_alloc_fail:
1516 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
1517 sizeof(void*));
1518 login_mtask_alloc_fail:
1519 kfifo_free(conn->mgmtqueue);
1520 mgmtqueue_alloc_fail:
1521 kfifo_free(conn->immqueue);
1522 immqueue_alloc_fail:
1523 iscsi_destroy_conn(cls_conn);
1524 return NULL;
1525 }
1526 EXPORT_SYMBOL_GPL(iscsi_conn_setup);
1527
1528 /**
1529 * iscsi_conn_teardown - teardown iscsi connection
1530 * cls_conn: iscsi class connection
1531 *
1532 * TODO: we may need to make this into a two step process
1533 * like scsi-mls remove + put host
1534 */
1535 void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
1536 {
1537 struct iscsi_conn *conn = cls_conn->dd_data;
1538 struct iscsi_session *session = conn->session;
1539 unsigned long flags;
1540
1541 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1542 mutex_lock(&conn->xmitmutex);
1543
1544 spin_lock_bh(&session->lock);
1545 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
1546 if (session->leadconn == conn) {
1547 /*
1548 * leading connection? then give up on recovery.
1549 */
1550 session->state = ISCSI_STATE_TERMINATE;
1551 wake_up(&conn->ehwait);
1552 }
1553 spin_unlock_bh(&session->lock);
1554
1555 mutex_unlock(&conn->xmitmutex);
1556
1557 /*
1558 * Block until all in-progress commands for this connection
1559 * time out or fail.
1560 */
1561 for (;;) {
1562 spin_lock_irqsave(session->host->host_lock, flags);
1563 if (!session->host->host_busy) { /* OK for ERL == 0 */
1564 spin_unlock_irqrestore(session->host->host_lock, flags);
1565 break;
1566 }
1567 spin_unlock_irqrestore(session->host->host_lock, flags);
1568 msleep_interruptible(500);
1569 printk(KERN_INFO "iscsi: scsi conn_destroy(): host_busy %d "
1570 "host_failed %d\n", session->host->host_busy,
1571 session->host->host_failed);
1572 /*
1573 * force eh_abort() to unblock
1574 */
1575 wake_up(&conn->ehwait);
1576 }
1577
1578 spin_lock_bh(&session->lock);
1579 kfree(conn->data);
1580 kfree(conn->persistent_address);
1581 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
1582 sizeof(void*));
1583 list_del(&conn->item);
1584 if (list_empty(&session->connections))
1585 session->leadconn = NULL;
1586 if (session->leadconn && session->leadconn == conn)
1587 session->leadconn = container_of(session->connections.next,
1588 struct iscsi_conn, item);
1589
1590 if (session->leadconn == NULL)
1591 /* no connections exits.. reset sequencing */
1592 session->cmdsn = session->max_cmdsn = session->exp_cmdsn = 1;
1593 spin_unlock_bh(&session->lock);
1594
1595 kfifo_free(conn->immqueue);
1596 kfifo_free(conn->mgmtqueue);
1597
1598 iscsi_destroy_conn(cls_conn);
1599 }
1600 EXPORT_SYMBOL_GPL(iscsi_conn_teardown);
1601
1602 int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
1603 {
1604 struct iscsi_conn *conn = cls_conn->dd_data;
1605 struct iscsi_session *session = conn->session;
1606
1607 if (!session) {
1608 printk(KERN_ERR "iscsi: can't start unbound connection\n");
1609 return -EPERM;
1610 }
1611
1612 if ((session->imm_data_en || !session->initial_r2t_en) &&
1613 session->first_burst > session->max_burst) {
1614 printk("iscsi: invalid burst lengths: "
1615 "first_burst %d max_burst %d\n",
1616 session->first_burst, session->max_burst);
1617 return -EINVAL;
1618 }
1619
1620 spin_lock_bh(&session->lock);
1621 conn->c_stage = ISCSI_CONN_STARTED;
1622 session->state = ISCSI_STATE_LOGGED_IN;
1623
1624 switch(conn->stop_stage) {
1625 case STOP_CONN_RECOVER:
1626 /*
1627 * unblock eh_abort() if it is blocked. re-try all
1628 * commands after successful recovery
1629 */
1630 conn->stop_stage = 0;
1631 conn->tmabort_state = TMABORT_INITIAL;
1632 session->age++;
1633 spin_unlock_bh(&session->lock);
1634
1635 iscsi_unblock_session(session_to_cls(session));
1636 wake_up(&conn->ehwait);
1637 return 0;
1638 case STOP_CONN_TERM:
1639 conn->stop_stage = 0;
1640 break;
1641 default:
1642 break;
1643 }
1644 spin_unlock_bh(&session->lock);
1645
1646 return 0;
1647 }
1648 EXPORT_SYMBOL_GPL(iscsi_conn_start);
1649
1650 static void
1651 flush_control_queues(struct iscsi_session *session, struct iscsi_conn *conn)
1652 {
1653 struct iscsi_mgmt_task *mtask, *tmp;
1654
1655 /* handle pending */
1656 while (__kfifo_get(conn->immqueue, (void*)&mtask, sizeof(void*)) ||
1657 __kfifo_get(conn->mgmtqueue, (void*)&mtask, sizeof(void*))) {
1658 if (mtask == conn->login_mtask)
1659 continue;
1660 debug_scsi("flushing pending mgmt task itt 0x%x\n", mtask->itt);
1661 __kfifo_put(session->mgmtpool.queue, (void*)&mtask,
1662 sizeof(void*));
1663 }
1664
1665 /* handle running */
1666 list_for_each_entry_safe(mtask, tmp, &conn->mgmt_run_list, running) {
1667 debug_scsi("flushing running mgmt task itt 0x%x\n", mtask->itt);
1668 list_del(&mtask->running);
1669
1670 if (mtask == conn->login_mtask)
1671 continue;
1672 __kfifo_put(session->mgmtpool.queue, (void*)&mtask,
1673 sizeof(void*));
1674 }
1675
1676 conn->mtask = NULL;
1677 }
1678
1679 /* Fail commands. Mutex and session lock held and recv side suspended */
1680 static void fail_all_commands(struct iscsi_conn *conn)
1681 {
1682 struct iscsi_cmd_task *ctask, *tmp;
1683
1684 /* flush pending */
1685 list_for_each_entry_safe(ctask, tmp, &conn->xmitqueue, running) {
1686 debug_scsi("failing pending sc %p itt 0x%x\n", ctask->sc,
1687 ctask->itt);
1688 fail_command(conn, ctask, DID_BUS_BUSY << 16);
1689 }
1690
1691 /* fail all other running */
1692 list_for_each_entry_safe(ctask, tmp, &conn->run_list, running) {
1693 debug_scsi("failing in progress sc %p itt 0x%x\n",
1694 ctask->sc, ctask->itt);
1695 fail_command(conn, ctask, DID_BUS_BUSY << 16);
1696 }
1697
1698 conn->ctask = NULL;
1699 }
1700
1701 static void iscsi_start_session_recovery(struct iscsi_session *session,
1702 struct iscsi_conn *conn, int flag)
1703 {
1704 int old_stop_stage;
1705
1706 spin_lock_bh(&session->lock);
1707 if (conn->stop_stage == STOP_CONN_TERM) {
1708 spin_unlock_bh(&session->lock);
1709 return;
1710 }
1711
1712 /*
1713 * When this is called for the in_login state, we only want to clean
1714 * up the login task and connection. We do not need to block and set
1715 * the recovery state again
1716 */
1717 if (flag == STOP_CONN_TERM)
1718 session->state = ISCSI_STATE_TERMINATE;
1719 else if (conn->stop_stage != STOP_CONN_RECOVER)
1720 session->state = ISCSI_STATE_IN_RECOVERY;
1721
1722 old_stop_stage = conn->stop_stage;
1723 conn->stop_stage = flag;
1724 conn->c_stage = ISCSI_CONN_STOPPED;
1725 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1726 spin_unlock_bh(&session->lock);
1727
1728 write_lock_bh(conn->recv_lock);
1729 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
1730 write_unlock_bh(conn->recv_lock);
1731
1732 mutex_lock(&conn->xmitmutex);
1733 /*
1734 * for connection level recovery we should not calculate
1735 * header digest. conn->hdr_size used for optimization
1736 * in hdr_extract() and will be re-negotiated at
1737 * set_param() time.
1738 */
1739 if (flag == STOP_CONN_RECOVER) {
1740 conn->hdrdgst_en = 0;
1741 conn->datadgst_en = 0;
1742 if (session->state == ISCSI_STATE_IN_RECOVERY &&
1743 old_stop_stage != STOP_CONN_RECOVER) {
1744 debug_scsi("blocking session\n");
1745 iscsi_block_session(session_to_cls(session));
1746 }
1747 }
1748
1749 /*
1750 * flush queues.
1751 */
1752 spin_lock_bh(&session->lock);
1753 fail_all_commands(conn);
1754 flush_control_queues(session, conn);
1755 spin_unlock_bh(&session->lock);
1756
1757 mutex_unlock(&conn->xmitmutex);
1758 }
1759
1760 void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
1761 {
1762 struct iscsi_conn *conn = cls_conn->dd_data;
1763 struct iscsi_session *session = conn->session;
1764
1765 switch (flag) {
1766 case STOP_CONN_RECOVER:
1767 case STOP_CONN_TERM:
1768 iscsi_start_session_recovery(session, conn, flag);
1769 break;
1770 default:
1771 printk(KERN_ERR "iscsi: invalid stop flag %d\n", flag);
1772 }
1773 }
1774 EXPORT_SYMBOL_GPL(iscsi_conn_stop);
1775
1776 int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
1777 struct iscsi_cls_conn *cls_conn, int is_leading)
1778 {
1779 struct iscsi_session *session = class_to_transport_session(cls_session);
1780 struct iscsi_conn *tmp = ERR_PTR(-EEXIST), *conn = cls_conn->dd_data;
1781
1782 /* lookup for existing connection */
1783 spin_lock_bh(&session->lock);
1784 list_for_each_entry(tmp, &session->connections, item) {
1785 if (tmp == conn) {
1786 if (conn->c_stage != ISCSI_CONN_STOPPED ||
1787 conn->stop_stage == STOP_CONN_TERM) {
1788 printk(KERN_ERR "iscsi: can't bind "
1789 "non-stopped connection (%d:%d)\n",
1790 conn->c_stage, conn->stop_stage);
1791 spin_unlock_bh(&session->lock);
1792 return -EIO;
1793 }
1794 break;
1795 }
1796 }
1797 if (tmp != conn) {
1798 /* bind new iSCSI connection to session */
1799 conn->session = session;
1800 list_add(&conn->item, &session->connections);
1801 }
1802 spin_unlock_bh(&session->lock);
1803
1804 if (is_leading)
1805 session->leadconn = conn;
1806
1807 /*
1808 * Unblock xmitworker(), Login Phase will pass through.
1809 */
1810 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
1811 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1812 return 0;
1813 }
1814 EXPORT_SYMBOL_GPL(iscsi_conn_bind);
1815
1816
1817 int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
1818 enum iscsi_param param, char *buf, int buflen)
1819 {
1820 struct iscsi_conn *conn = cls_conn->dd_data;
1821 struct iscsi_session *session = conn->session;
1822 uint32_t value;
1823
1824 switch(param) {
1825 case ISCSI_PARAM_MAX_RECV_DLENGTH:
1826 sscanf(buf, "%d", &conn->max_recv_dlength);
1827 break;
1828 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
1829 sscanf(buf, "%d", &conn->max_xmit_dlength);
1830 break;
1831 case ISCSI_PARAM_HDRDGST_EN:
1832 sscanf(buf, "%d", &conn->hdrdgst_en);
1833 break;
1834 case ISCSI_PARAM_DATADGST_EN:
1835 sscanf(buf, "%d", &conn->datadgst_en);
1836 break;
1837 case ISCSI_PARAM_INITIAL_R2T_EN:
1838 sscanf(buf, "%d", &session->initial_r2t_en);
1839 break;
1840 case ISCSI_PARAM_MAX_R2T:
1841 sscanf(buf, "%d", &session->max_r2t);
1842 break;
1843 case ISCSI_PARAM_IMM_DATA_EN:
1844 sscanf(buf, "%d", &session->imm_data_en);
1845 break;
1846 case ISCSI_PARAM_FIRST_BURST:
1847 sscanf(buf, "%d", &session->first_burst);
1848 break;
1849 case ISCSI_PARAM_MAX_BURST:
1850 sscanf(buf, "%d", &session->max_burst);
1851 break;
1852 case ISCSI_PARAM_PDU_INORDER_EN:
1853 sscanf(buf, "%d", &session->pdu_inorder_en);
1854 break;
1855 case ISCSI_PARAM_DATASEQ_INORDER_EN:
1856 sscanf(buf, "%d", &session->dataseq_inorder_en);
1857 break;
1858 case ISCSI_PARAM_ERL:
1859 sscanf(buf, "%d", &session->erl);
1860 break;
1861 case ISCSI_PARAM_IFMARKER_EN:
1862 sscanf(buf, "%d", &value);
1863 BUG_ON(value);
1864 break;
1865 case ISCSI_PARAM_OFMARKER_EN:
1866 sscanf(buf, "%d", &value);
1867 BUG_ON(value);
1868 break;
1869 case ISCSI_PARAM_EXP_STATSN:
1870 sscanf(buf, "%u", &conn->exp_statsn);
1871 break;
1872 case ISCSI_PARAM_TARGET_NAME:
1873 /* this should not change between logins */
1874 if (session->targetname)
1875 break;
1876
1877 session->targetname = kstrdup(buf, GFP_KERNEL);
1878 if (!session->targetname)
1879 return -ENOMEM;
1880 break;
1881 case ISCSI_PARAM_TPGT:
1882 sscanf(buf, "%d", &session->tpgt);
1883 break;
1884 case ISCSI_PARAM_PERSISTENT_PORT:
1885 sscanf(buf, "%d", &conn->persistent_port);
1886 break;
1887 case ISCSI_PARAM_PERSISTENT_ADDRESS:
1888 /*
1889 * this is the address returned in discovery so it should
1890 * not change between logins.
1891 */
1892 if (conn->persistent_address)
1893 break;
1894
1895 conn->persistent_address = kstrdup(buf, GFP_KERNEL);
1896 if (!conn->persistent_address)
1897 return -ENOMEM;
1898 break;
1899 default:
1900 return -ENOSYS;
1901 }
1902
1903 return 0;
1904 }
1905 EXPORT_SYMBOL_GPL(iscsi_set_param);
1906
1907 int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
1908 enum iscsi_param param, char *buf)
1909 {
1910 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
1911 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
1912 int len;
1913
1914 switch(param) {
1915 case ISCSI_PARAM_INITIAL_R2T_EN:
1916 len = sprintf(buf, "%d\n", session->initial_r2t_en);
1917 break;
1918 case ISCSI_PARAM_MAX_R2T:
1919 len = sprintf(buf, "%hu\n", session->max_r2t);
1920 break;
1921 case ISCSI_PARAM_IMM_DATA_EN:
1922 len = sprintf(buf, "%d\n", session->imm_data_en);
1923 break;
1924 case ISCSI_PARAM_FIRST_BURST:
1925 len = sprintf(buf, "%u\n", session->first_burst);
1926 break;
1927 case ISCSI_PARAM_MAX_BURST:
1928 len = sprintf(buf, "%u\n", session->max_burst);
1929 break;
1930 case ISCSI_PARAM_PDU_INORDER_EN:
1931 len = sprintf(buf, "%d\n", session->pdu_inorder_en);
1932 break;
1933 case ISCSI_PARAM_DATASEQ_INORDER_EN:
1934 len = sprintf(buf, "%d\n", session->dataseq_inorder_en);
1935 break;
1936 case ISCSI_PARAM_ERL:
1937 len = sprintf(buf, "%d\n", session->erl);
1938 break;
1939 case ISCSI_PARAM_TARGET_NAME:
1940 len = sprintf(buf, "%s\n", session->targetname);
1941 break;
1942 case ISCSI_PARAM_TPGT:
1943 len = sprintf(buf, "%d\n", session->tpgt);
1944 break;
1945 default:
1946 return -ENOSYS;
1947 }
1948
1949 return len;
1950 }
1951 EXPORT_SYMBOL_GPL(iscsi_session_get_param);
1952
1953 int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
1954 enum iscsi_param param, char *buf)
1955 {
1956 struct iscsi_conn *conn = cls_conn->dd_data;
1957 int len;
1958
1959 switch(param) {
1960 case ISCSI_PARAM_MAX_RECV_DLENGTH:
1961 len = sprintf(buf, "%u\n", conn->max_recv_dlength);
1962 break;
1963 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
1964 len = sprintf(buf, "%u\n", conn->max_xmit_dlength);
1965 break;
1966 case ISCSI_PARAM_HDRDGST_EN:
1967 len = sprintf(buf, "%d\n", conn->hdrdgst_en);
1968 break;
1969 case ISCSI_PARAM_DATADGST_EN:
1970 len = sprintf(buf, "%d\n", conn->datadgst_en);
1971 break;
1972 case ISCSI_PARAM_IFMARKER_EN:
1973 len = sprintf(buf, "%d\n", conn->ifmarker_en);
1974 break;
1975 case ISCSI_PARAM_OFMARKER_EN:
1976 len = sprintf(buf, "%d\n", conn->ofmarker_en);
1977 break;
1978 case ISCSI_PARAM_EXP_STATSN:
1979 len = sprintf(buf, "%u\n", conn->exp_statsn);
1980 break;
1981 case ISCSI_PARAM_PERSISTENT_PORT:
1982 len = sprintf(buf, "%d\n", conn->persistent_port);
1983 break;
1984 case ISCSI_PARAM_PERSISTENT_ADDRESS:
1985 len = sprintf(buf, "%s\n", conn->persistent_address);
1986 break;
1987 default:
1988 return -ENOSYS;
1989 }
1990
1991 return len;
1992 }
1993 EXPORT_SYMBOL_GPL(iscsi_conn_get_param);
1994
1995 MODULE_AUTHOR("Mike Christie");
1996 MODULE_DESCRIPTION("iSCSI library functions");
1997 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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