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[SCSI] iscsi bugfixes: fix oops when iser is flushing io
[deliverable/linux.git] / drivers / scsi / libiscsi.c
CommitLineData
7996a778
MC		 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
40struct iscsi_session *
41class_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}
46EXPORT_SYMBOL_GPL(class_to_transport_session);
47
48#define INVALID_SN_DELTA 0xffff
49
50int
51iscsi_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}
68EXPORT_SYMBOL_GPL(iscsi_check_assign_cmdsn);
69
70void iscsi_prep_unsolicit_data_pdu(struct iscsi_cmd_task *ctask,
71 struct iscsi_data *hdr,
72 int transport_data_cnt)
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
86 hdr->offset = cpu_to_be32(ctask->total_length -
87 transport_data_cnt -
88 ctask->unsol_count);
89
90 if (ctask->unsol_count > conn->max_xmit_dlength) {
91 hton24(hdr->dlength, conn->max_xmit_dlength);
92 ctask->data_count = conn->max_xmit_dlength;
93 hdr->flags = 0;
94 } else {
95 hton24(hdr->dlength, ctask->unsol_count);
96 ctask->data_count = ctask->unsol_count;
97 hdr->flags = ISCSI_FLAG_CMD_FINAL;
98 }
99}
100EXPORT_SYMBOL_GPL(iscsi_prep_unsolicit_data_pdu);
101
102/**
103 * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
104 * @ctask: iscsi cmd task
105 *
106 * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set
107 * fields like dlength or final based on how much data it sends
108 */
109static void iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask)
110{
111 struct iscsi_conn *conn = ctask->conn;
112 struct iscsi_session *session = conn->session;
113 struct iscsi_cmd *hdr = ctask->hdr;
114 struct scsi_cmnd *sc = ctask->sc;
115
116 hdr->opcode = ISCSI_OP_SCSI_CMD;
117 hdr->flags = ISCSI_ATTR_SIMPLE;
118 int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun);
119 hdr->itt = ctask->itt | (conn->id << ISCSI_CID_SHIFT) |
120 (session->age << ISCSI_AGE_SHIFT);
121 hdr->data_length = cpu_to_be32(sc->request_bufflen);
122 hdr->cmdsn = cpu_to_be32(session->cmdsn);
123 session->cmdsn++;
124 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
125 memcpy(hdr->cdb, sc->cmnd, sc->cmd_len);
126 memset(&hdr->cdb[sc->cmd_len], 0, MAX_COMMAND_SIZE - sc->cmd_len);
127
128 if (sc->sc_data_direction == DMA_TO_DEVICE) {
129 hdr->flags |= ISCSI_FLAG_CMD_WRITE;
130 /*
131 * Write counters:
132 *
133 * imm_count bytes to be sent right after
134 * SCSI PDU Header
135 *
136 * unsol_count bytes(as Data-Out) to be sent
137 * without R2T ack right after
138 * immediate data
139 *
140 * r2t_data_count bytes to be sent via R2T ack's
141 *
142 * pad_count bytes to be sent as zero-padding
143 */
144 ctask->imm_count = 0;
145 ctask->unsol_count = 0;
146 ctask->unsol_datasn = 0;
147
148 if (session->imm_data_en) {
149 if (ctask->total_length >= session->first_burst)
150 ctask->imm_count = min(session->first_burst,
151 conn->max_xmit_dlength);
152 else
153 ctask->imm_count = min(ctask->total_length,
154 conn->max_xmit_dlength);
155 hton24(ctask->hdr->dlength, ctask->imm_count);
156 } else
157 zero_data(ctask->hdr->dlength);
158
159 if (!session->initial_r2t_en)
160 ctask->unsol_count = min(session->first_burst,
161 ctask->total_length) - ctask->imm_count;
162 if (!ctask->unsol_count)
163 /* No unsolicit Data-Out's */
164 ctask->hdr->flags |= ISCSI_FLAG_CMD_FINAL;
165 } else {
166 ctask->datasn = 0;
167 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
168 zero_data(hdr->dlength);
169
170 if (sc->sc_data_direction == DMA_FROM_DEVICE)
171 hdr->flags |= ISCSI_FLAG_CMD_READ;
172 }
173
174 conn->scsicmd_pdus_cnt++;
175}
176EXPORT_SYMBOL_GPL(iscsi_prep_scsi_cmd_pdu);
177
178/**
179 * iscsi_complete_command - return command back to scsi-ml
180 * @session: iscsi session
181 * @ctask: iscsi cmd task
182 *
183 * Must be called with session lock.
184 * This function returns the scsi command to scsi-ml and returns
185 * the cmd task to the pool of available cmd tasks.
186 */
187static void iscsi_complete_command(struct iscsi_session *session,
188 struct iscsi_cmd_task *ctask)
189{
190 struct scsi_cmnd *sc = ctask->sc;
191
b6c395ed 192 ctask->state = ISCSI_TASK_COMPLETED;
7996a778
MC		 193 ctask->sc = NULL;
194 list_del_init(&ctask->running);
195 __kfifo_put(session->cmdpool.queue, (void*)&ctask, sizeof(void*));
196 sc->scsi_done(sc);
197}
198
199/**
200 * iscsi_cmd_rsp - SCSI Command Response processing
201 * @conn: iscsi connection
202 * @hdr: iscsi header
203 * @ctask: scsi command task
204 * @data: cmd data buffer
205 * @datalen: len of buffer
206 *
207 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and
208 * then completes the command and task.
209 **/
210static int iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
211 struct iscsi_cmd_task *ctask, char *data,
212 int datalen)
213{
214 int rc;
215 struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)hdr;
216 struct iscsi_session *session = conn->session;
217 struct scsi_cmnd *sc = ctask->sc;
218
219 rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr);
220 if (rc) {
221 sc->result = DID_ERROR << 16;
222 goto out;
223 }
224
225 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
226
227 sc->result = (DID_OK << 16) | rhdr->cmd_status;
228
229 if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) {
230 sc->result = DID_ERROR << 16;
231 goto out;
232 }
233
234 if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) {
235 int senselen;
236
237 if (datalen < 2) {
238invalid_datalen:
be2df72e
OG		 239 printk(KERN_ERR "iscsi: Got CHECK_CONDITION but "
240 "invalid data buffer size of %d\n", datalen);
7996a778
MC		 241 sc->result = DID_BAD_TARGET << 16;
242 goto out;
243 }
244
245 senselen = (data[0] << 8) | data[1];
246 if (datalen < senselen)
247 goto invalid_datalen;
248
249 memcpy(sc->sense_buffer, data + 2,
250 min(senselen, SCSI_SENSE_BUFFERSIZE));
251 debug_scsi("copied %d bytes of sense\n",
252 min(senselen, SCSI_SENSE_BUFFERSIZE));
253 }
254
255 if (sc->sc_data_direction == DMA_TO_DEVICE)
256 goto out;
257
258 if (rhdr->flags & ISCSI_FLAG_CMD_UNDERFLOW) {
259 int res_count = be32_to_cpu(rhdr->residual_count);
260
261 if (res_count > 0 && res_count <= sc->request_bufflen)
262 sc->resid = res_count;
263 else
264 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
265 } else if (rhdr->flags & ISCSI_FLAG_CMD_BIDI_UNDERFLOW)
266 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
267 else if (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW)
268 sc->resid = be32_to_cpu(rhdr->residual_count);
269
270out:
271 debug_scsi("done [sc %lx res %d itt 0x%x]\n",
272 (long)sc, sc->result, ctask->itt);
273 conn->scsirsp_pdus_cnt++;
274
275 iscsi_complete_command(conn->session, ctask);
276 return rc;
277}
278
7ea8b828
MC		 279static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
280{
281 struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr;
282
283 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
284 conn->tmfrsp_pdus_cnt++;
285
286 if (conn->tmabort_state != TMABORT_INITIAL)
287 return;
288
289 if (tmf->response == ISCSI_TMF_RSP_COMPLETE)
290 conn->tmabort_state = TMABORT_SUCCESS;
291 else if (tmf->response == ISCSI_TMF_RSP_NO_TASK)
292 conn->tmabort_state = TMABORT_NOT_FOUND;
293 else
294 conn->tmabort_state = TMABORT_FAILED;
295 wake_up(&conn->ehwait);
296}
297
7996a778
MC		 298/**
299 * __iscsi_complete_pdu - complete pdu
300 * @conn: iscsi conn
301 * @hdr: iscsi header
302 * @data: data buffer
303 * @datalen: len of data buffer
304 *
305 * Completes pdu processing by freeing any resources allocated at
306 * queuecommand or send generic. session lock must be held and verify
307 * itt must have been called.
308 */
309int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
310 char *data, int datalen)
311{
312 struct iscsi_session *session = conn->session;
313 int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0;
314 struct iscsi_cmd_task *ctask;
315 struct iscsi_mgmt_task *mtask;
316 uint32_t itt;
317
318 if (hdr->itt != cpu_to_be32(ISCSI_RESERVED_TAG))
319 itt = hdr->itt & ISCSI_ITT_MASK;
320 else
321 itt = hdr->itt;
322
323 if (itt < session->cmds_max) {
324 ctask = session->cmds[itt];
325
326 debug_scsi("cmdrsp [op 0x%x cid %d itt 0x%x len %d]\n",
327 opcode, conn->id, ctask->itt, datalen);
328
329 switch(opcode) {
330 case ISCSI_OP_SCSI_CMD_RSP:
331 BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
332 rc = iscsi_scsi_cmd_rsp(conn, hdr, ctask, data,
333 datalen);
334 break;
335 case ISCSI_OP_SCSI_DATA_IN:
336 BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
337 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
338 conn->scsirsp_pdus_cnt++;
339 iscsi_complete_command(session, ctask);
340 }
341 break;
342 case ISCSI_OP_R2T:
343 /* LLD handles this for now */
344 break;
345 default:
346 rc = ISCSI_ERR_BAD_OPCODE;
347 break;
348 }
349 } else if (itt >= ISCSI_MGMT_ITT_OFFSET &&
350 itt < ISCSI_MGMT_ITT_OFFSET + session->mgmtpool_max) {
351 mtask = session->mgmt_cmds[itt - ISCSI_MGMT_ITT_OFFSET];
352
353 debug_scsi("immrsp [op 0x%x cid %d itt 0x%x len %d]\n",
354 opcode, conn->id, mtask->itt, datalen);
355
8d2860b3
MC		 356 rc = iscsi_check_assign_cmdsn(session,
357 (struct iscsi_nopin*)hdr);
358 if (rc)
359 goto done;
360
7996a778 361 switch(opcode) {
8d2860b3
MC		 362 case ISCSI_OP_LOGOUT_RSP:
363 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
364 /* fall through */
7996a778
MC		 365 case ISCSI_OP_LOGIN_RSP:
366 case ISCSI_OP_TEXT_RSP:
8d2860b3
MC		 367 /*
368 * login related PDU's exp_statsn is handled in
369 * userspace
370 */
7996a778
MC		 371 rc = iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen);
372 list_del(&mtask->running);
373 if (conn->login_mtask != mtask)
374 __kfifo_put(session->mgmtpool.queue,
375 (void*)&mtask, sizeof(void*));
376 break;
377 case ISCSI_OP_SCSI_TMFUNC_RSP:
7996a778
MC		 378 if (datalen) {
379 rc = ISCSI_ERR_PROTO;
380 break;
381 }
8d2860b3 382
7ea8b828 383 iscsi_tmf_rsp(conn, hdr);
7996a778
MC		 384 break;
385 case ISCSI_OP_NOOP_IN:
386 if (hdr->ttt != ISCSI_RESERVED_TAG) {
387 rc = ISCSI_ERR_PROTO;
388 break;
389 }
7996a778
MC		 390 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
391
392 rc = iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen);
393 list_del(&mtask->running);
394 if (conn->login_mtask != mtask)
395 __kfifo_put(session->mgmtpool.queue,
396 (void*)&mtask, sizeof(void*));
397 break;
398 default:
399 rc = ISCSI_ERR_BAD_OPCODE;
400 break;
401 }
402 } else if (itt == ISCSI_RESERVED_TAG) {
403 switch(opcode) {
404 case ISCSI_OP_NOOP_IN:
405 if (!datalen) {
406 rc = iscsi_check_assign_cmdsn(session,
407 (struct iscsi_nopin*)hdr);
408 if (!rc && hdr->ttt != ISCSI_RESERVED_TAG)
409 rc = iscsi_recv_pdu(conn->cls_conn,
410 hdr, NULL, 0);
411 } else
412 rc = ISCSI_ERR_PROTO;
413 break;
414 case ISCSI_OP_REJECT:
415 /* we need sth like iscsi_reject_rsp()*/
416 case ISCSI_OP_ASYNC_EVENT:
8d2860b3 417 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
7996a778
MC		 418 /* we need sth like iscsi_async_event_rsp() */
419 rc = ISCSI_ERR_BAD_OPCODE;
420 break;
421 default:
422 rc = ISCSI_ERR_BAD_OPCODE;
423 break;
424 }
425 } else
426 rc = ISCSI_ERR_BAD_ITT;
427
8d2860b3 428done:
7996a778
MC		 429 return rc;
430}
431EXPORT_SYMBOL_GPL(__iscsi_complete_pdu);
432
433int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
434 char *data, int datalen)
435{
436 int rc;
437
438 spin_lock(&conn->session->lock);
439 rc = __iscsi_complete_pdu(conn, hdr, data, datalen);
440 spin_unlock(&conn->session->lock);
441 return rc;
442}
443EXPORT_SYMBOL_GPL(iscsi_complete_pdu);
444
445/* verify itt (itt encoding: age+cid+itt) */
446int iscsi_verify_itt(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
447 uint32_t *ret_itt)
448{
449 struct iscsi_session *session = conn->session;
450 struct iscsi_cmd_task *ctask;
451 uint32_t itt;
452
453 if (hdr->itt != cpu_to_be32(ISCSI_RESERVED_TAG)) {
454 if ((hdr->itt & ISCSI_AGE_MASK) !=
455 (session->age << ISCSI_AGE_SHIFT)) {
be2df72e 456 printk(KERN_ERR "iscsi: received itt %x expected "
7996a778
MC		 457 "session age (%x)\n", hdr->itt,
458 session->age & ISCSI_AGE_MASK);
459 return ISCSI_ERR_BAD_ITT;
460 }
461
462 if ((hdr->itt & ISCSI_CID_MASK) !=
463 (conn->id << ISCSI_CID_SHIFT)) {
be2df72e 464 printk(KERN_ERR "iscsi: received itt %x, expected "
7996a778
MC		 465 "CID (%x)\n", hdr->itt, conn->id);
466 return ISCSI_ERR_BAD_ITT;
467 }
468 itt = hdr->itt & ISCSI_ITT_MASK;
469 } else
470 itt = hdr->itt;
471
472 if (itt < session->cmds_max) {
473 ctask = session->cmds[itt];
474
475 if (!ctask->sc) {
be2df72e 476 printk(KERN_INFO "iscsi: dropping ctask with "
7996a778
MC		 477 "itt 0x%x\n", ctask->itt);
478 /* force drop */
479 return ISCSI_ERR_NO_SCSI_CMD;
480 }
481
482 if (ctask->sc->SCp.phase != session->age) {
be2df72e 483 printk(KERN_ERR "iscsi: ctask's session age %d, "
7996a778
MC		 484 "expected %d\n", ctask->sc->SCp.phase,
485 session->age);
486 return ISCSI_ERR_SESSION_FAILED;
487 }
488 }
489
490 *ret_itt = itt;
491 return 0;
492}
493EXPORT_SYMBOL_GPL(iscsi_verify_itt);
494
495void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
496{
497 struct iscsi_session *session = conn->session;
498 unsigned long flags;
499
500 spin_lock_irqsave(&session->lock, flags);
656cffc9
MC		 501 if (session->state == ISCSI_STATE_FAILED) {
502 spin_unlock_irqrestore(&session->lock, flags);
503 return;
504 }
505
67a61114 506 if (conn->stop_stage == 0)
7996a778
MC		 507 session->state = ISCSI_STATE_FAILED;
508 spin_unlock_irqrestore(&session->lock, flags);
509 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
510 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
511 iscsi_conn_error(conn->cls_conn, err);
512}
513EXPORT_SYMBOL_GPL(iscsi_conn_failure);
514
515/**
516 * iscsi_data_xmit - xmit any command into the scheduled connection
517 * @conn: iscsi connection
518 *
519 * Notes:
520 * The function can return -EAGAIN in which case the caller must
521 * re-schedule it again later or recover. '0' return code means
522 * successful xmit.
523 **/
524static int iscsi_data_xmit(struct iscsi_conn *conn)
525{
526 struct iscsi_transport *tt;
3219e529 527 int rc = 0;
7996a778
MC		 528
529 if (unlikely(conn->suspend_tx)) {
530 debug_scsi("conn %d Tx suspended!\n", conn->id);
3219e529 531 return -ENODATA;
7996a778
MC		 532 }
533 tt = conn->session->tt;
534
535 /*
536 * Transmit in the following order:
537 *
538 * 1) un-finished xmit (ctask or mtask)
539 * 2) immediate control PDUs
540 * 3) write data
541 * 4) SCSI commands
542 * 5) non-immediate control PDUs
543 *
544 * No need to lock around __kfifo_get as long as
545 * there's one producer and one consumer.
546 */
547
548 BUG_ON(conn->ctask && conn->mtask);
549
550 if (conn->ctask) {
3219e529
MC		 551 rc = tt->xmit_cmd_task(conn, conn->ctask);
552 if (rc)
7996a778
MC		 553 goto again;
554 /* done with this in-progress ctask */
555 conn->ctask = NULL;
556 }
557 if (conn->mtask) {
3219e529
MC		 558 rc = tt->xmit_mgmt_task(conn, conn->mtask);
559 if (rc)
7996a778
MC		 560 goto again;
561 /* done with this in-progress mtask */
562 conn->mtask = NULL;
563 }
564
565 /* process immediate first */
566 if (unlikely(__kfifo_len(conn->immqueue))) {
567 while (__kfifo_get(conn->immqueue, (void*)&conn->mtask,
568 sizeof(void*))) {
994442e8 569 spin_lock_bh(&conn->session->lock);
7996a778
MC		 570 list_add_tail(&conn->mtask->running,
571 &conn->mgmt_run_list);
994442e8 572 spin_unlock_bh(&conn->session->lock);
3219e529
MC		 573 rc = tt->xmit_mgmt_task(conn, conn->mtask);
574 if (rc)
7996a778
MC		 575 goto again;
576 }
577 /* done with this mtask */
578 conn->mtask = NULL;
579 }
580
581 /* process command queue */
b6c395ed
MC		 582 spin_lock_bh(&conn->session->lock);
583 while (!list_empty(&conn->xmitqueue)) {
7996a778
MC		 584 /*
585 * iscsi tcp may readd the task to the xmitqueue to send
586 * write data
587 */
b6c395ed
MC		 588 conn->ctask = list_entry(conn->xmitqueue.next,
589 struct iscsi_cmd_task, running);
590 conn->ctask->state = ISCSI_TASK_RUNNING;
591 list_move_tail(conn->xmitqueue.next, &conn->run_list);
994442e8 592 spin_unlock_bh(&conn->session->lock);
b6c395ed 593
3219e529
MC		 594 rc = tt->xmit_cmd_task(conn, conn->ctask);
595 if (rc)
7996a778 596 goto again;
b6c395ed 597 spin_lock_bh(&conn->session->lock);
7996a778 598 }
b6c395ed 599 spin_unlock_bh(&conn->session->lock);
7996a778
MC		 600 /* done with this ctask */
601 conn->ctask = NULL;
602
603 /* process the rest control plane PDUs, if any */
604 if (unlikely(__kfifo_len(conn->mgmtqueue))) {
605 while (__kfifo_get(conn->mgmtqueue, (void*)&conn->mtask,
606 sizeof(void*))) {
994442e8 607 spin_lock_bh(&conn->session->lock);
7996a778
MC		 608 list_add_tail(&conn->mtask->running,
609 &conn->mgmt_run_list);
994442e8 610 spin_unlock_bh(&conn->session->lock);
3219e529
MC		 611 rc = tt->xmit_mgmt_task(conn, conn->mtask);
612 if (rc)
7996a778
MC		 613 goto again;
614 }
615 /* done with this mtask */
616 conn->mtask = NULL;
617 }
618
3219e529 619 return -ENODATA;
7996a778
MC		 620
621again:
622 if (unlikely(conn->suspend_tx))
3219e529 623 return -ENODATA;
7996a778 624
3219e529 625 return rc;
7996a778
MC		 626}
627
628static void iscsi_xmitworker(void *data)
629{
630 struct iscsi_conn *conn = data;
3219e529 631 int rc;
7996a778
MC		 632 /*
633 * serialize Xmit worker on a per-connection basis.
634 */
635 mutex_lock(&conn->xmitmutex);
3219e529
MC		 636 do {
637 rc = iscsi_data_xmit(conn);
638 } while (rc >= 0 || rc == -EAGAIN);
7996a778
MC		 639 mutex_unlock(&conn->xmitmutex);
640}
641
642enum {
643 FAILURE_BAD_HOST = 1,
644 FAILURE_SESSION_FAILED,
645 FAILURE_SESSION_FREED,
646 FAILURE_WINDOW_CLOSED,
647 FAILURE_SESSION_TERMINATE,
656cffc9 648 FAILURE_SESSION_IN_RECOVERY,
7996a778
MC		 649 FAILURE_SESSION_RECOVERY_TIMEOUT,
650};
651
652int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
653{
654 struct Scsi_Host *host;
655 int reason = 0;
656 struct iscsi_session *session;
657 struct iscsi_conn *conn;
658 struct iscsi_cmd_task *ctask = NULL;
659
660 sc->scsi_done = done;
661 sc->result = 0;
662
663 host = sc->device->host;
664 session = iscsi_hostdata(host->hostdata);
665
666 spin_lock(&session->lock);
667
656cffc9
MC		 668 /*
669 * ISCSI_STATE_FAILED is a temp. state. The recovery
670 * code will decide what is best to do with command queued
671 * during this time
672 */
673 if (session->state != ISCSI_STATE_LOGGED_IN &&
674 session->state != ISCSI_STATE_FAILED) {
675 /*
676 * to handle the race between when we set the recovery state
677 * and block the session we requeue here (commands could
678 * be entering our queuecommand while a block is starting
679 * up because the block code is not locked)
680 */
681 if (session->state == ISCSI_STATE_IN_RECOVERY) {
682 reason = FAILURE_SESSION_IN_RECOVERY;
67a61114 683 goto reject;
7996a778 684 }
656cffc9
MC		 685
686 if (session->state == ISCSI_STATE_RECOVERY_FAILED)
687 reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
688 else if (session->state == ISCSI_STATE_TERMINATE)
689 reason = FAILURE_SESSION_TERMINATE;
690 else
691 reason = FAILURE_SESSION_FREED;
7996a778
MC		 692 goto fault;
693 }
694
695 /*
696 * Check for iSCSI window and take care of CmdSN wrap-around
697 */
698 if ((int)(session->max_cmdsn - session->cmdsn) < 0) {
699 reason = FAILURE_WINDOW_CLOSED;
700 goto reject;
701 }
702
703 conn = session->leadconn;
704
705 __kfifo_get(session->cmdpool.queue, (void*)&ctask, sizeof(void*));
706 sc->SCp.phase = session->age;
707 sc->SCp.ptr = (char *)ctask;
708
b6c395ed 709 ctask->state = ISCSI_TASK_PENDING;
7996a778
MC		 710 ctask->mtask = NULL;
711 ctask->conn = conn;
712 ctask->sc = sc;
713 INIT_LIST_HEAD(&ctask->running);
714 ctask->total_length = sc->request_bufflen;
715 iscsi_prep_scsi_cmd_pdu(ctask);
716
717 session->tt->init_cmd_task(ctask);
718
b6c395ed 719 list_add_tail(&ctask->running, &conn->xmitqueue);
7996a778
MC		 720 debug_scsi(
721 "ctask enq [%s cid %d sc %lx itt 0x%x len %d cmdsn %d win %d]\n",
722 sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read",
723 conn->id, (long)sc, ctask->itt, sc->request_bufflen,
724 session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1);
725 spin_unlock(&session->lock);
726
727 scsi_queue_work(host, &conn->xmitwork);
728 return 0;
729
730reject:
731 spin_unlock(&session->lock);
732 debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason);
733 return SCSI_MLQUEUE_HOST_BUSY;
734
735fault:
736 spin_unlock(&session->lock);
be2df72e 737 printk(KERN_ERR "iscsi: cmd 0x%x is not queued (%d)\n",
7996a778
MC		 738 sc->cmnd[0], reason);
739 sc->result = (DID_NO_CONNECT << 16);
740 sc->resid = sc->request_bufflen;
741 sc->scsi_done(sc);
742 return 0;
743}
744EXPORT_SYMBOL_GPL(iscsi_queuecommand);
745
746int iscsi_change_queue_depth(struct scsi_device *sdev, int depth)
747{
748 if (depth > ISCSI_MAX_CMD_PER_LUN)
749 depth = ISCSI_MAX_CMD_PER_LUN;
750 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
751 return sdev->queue_depth;
752}
753EXPORT_SYMBOL_GPL(iscsi_change_queue_depth);
754
755static int
756iscsi_conn_send_generic(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
757 char *data, uint32_t data_size)
758{
759 struct iscsi_session *session = conn->session;
760 struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
761 struct iscsi_mgmt_task *mtask;
762
763 spin_lock_bh(&session->lock);
764 if (session->state == ISCSI_STATE_TERMINATE) {
765 spin_unlock_bh(&session->lock);
766 return -EPERM;
767 }
768 if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) ||
769 hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
770 /*
771 * Login and Text are sent serially, in
772 * request-followed-by-response sequence.
773 * Same mtask can be used. Same ITT must be used.
774 * Note that login_mtask is preallocated at conn_create().
775 */
776 mtask = conn->login_mtask;
777 else {
656cffc9
MC		 778 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
779 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
7996a778 780
8d2860b3 781 nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
7996a778
MC		 782 if (!__kfifo_get(session->mgmtpool.queue,
783 (void*)&mtask, sizeof(void*))) {
784 spin_unlock_bh(&session->lock);
785 return -ENOSPC;
786 }
787 }
788
789 /*
8d2860b3 790 * pre-format CmdSN for outgoing PDU.
7996a778
MC		 791 */
792 if (hdr->itt != cpu_to_be32(ISCSI_RESERVED_TAG)) {
793 hdr->itt = mtask->itt | (conn->id << ISCSI_CID_SHIFT) |
794 (session->age << ISCSI_AGE_SHIFT);
795 nop->cmdsn = cpu_to_be32(session->cmdsn);
796 if (conn->c_stage == ISCSI_CONN_STARTED &&
797 !(hdr->opcode & ISCSI_OP_IMMEDIATE))
798 session->cmdsn++;
799 } else
800 /* do not advance CmdSN */
801 nop->cmdsn = cpu_to_be32(session->cmdsn);
802
7996a778
MC		 803 if (data_size) {
804 memcpy(mtask->data, data, data_size);
805 mtask->data_count = data_size;
806 } else
807 mtask->data_count = 0;
808
809 INIT_LIST_HEAD(&mtask->running);
810 memcpy(mtask->hdr, hdr, sizeof(struct iscsi_hdr));
811 if (session->tt->init_mgmt_task)
812 session->tt->init_mgmt_task(conn, mtask, data, data_size);
813 spin_unlock_bh(&session->lock);
814
815 debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n",
816 hdr->opcode, hdr->itt, data_size);
817
818 /*
819 * since send_pdu() could be called at least from two contexts,
820 * we need to serialize __kfifo_put, so we don't have to take
821 * additional lock on fast data-path
822 */
823 if (hdr->opcode & ISCSI_OP_IMMEDIATE)
824 __kfifo_put(conn->immqueue, (void*)&mtask, sizeof(void*));
825 else
826 __kfifo_put(conn->mgmtqueue, (void*)&mtask, sizeof(void*));
827
828 scsi_queue_work(session->host, &conn->xmitwork);
829 return 0;
830}
831
832int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr,
833 char *data, uint32_t data_size)
834{
835 struct iscsi_conn *conn = cls_conn->dd_data;
836 int rc;
837
838 mutex_lock(&conn->xmitmutex);
839 rc = iscsi_conn_send_generic(conn, hdr, data, data_size);
840 mutex_unlock(&conn->xmitmutex);
841
842 return rc;
843}
844EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu);
845
846void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
847{
848 struct iscsi_session *session = class_to_transport_session(cls_session);
849 struct iscsi_conn *conn = session->leadconn;
850
851 spin_lock_bh(&session->lock);
852 if (session->state != ISCSI_STATE_LOGGED_IN) {
656cffc9 853 session->state = ISCSI_STATE_RECOVERY_FAILED;
7996a778
MC		 854 if (conn)
855 wake_up(&conn->ehwait);
856 }
857 spin_unlock_bh(&session->lock);
858}
859EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
860
861int iscsi_eh_host_reset(struct scsi_cmnd *sc)
862{
863 struct Scsi_Host *host = sc->device->host;
864 struct iscsi_session *session = iscsi_hostdata(host->hostdata);
865 struct iscsi_conn *conn = session->leadconn;
866 int fail_session = 0;
867
868 spin_lock_bh(&session->lock);
869 if (session->state == ISCSI_STATE_TERMINATE) {
870failed:
871 debug_scsi("failing host reset: session terminated "
872 "[CID %d age %d]", conn->id, session->age);
873 spin_unlock_bh(&session->lock);
874 return FAILED;
875 }
876
877 if (sc->SCp.phase == session->age) {
878 debug_scsi("failing connection CID %d due to SCSI host reset",
879 conn->id);
880 fail_session = 1;
881 }
882 spin_unlock_bh(&session->lock);
883
884 /*
885 * we drop the lock here but the leadconn cannot be destoyed while
886 * we are in the scsi eh
887 */
656cffc9 888 if (fail_session)
7996a778 889 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
7996a778
MC		 890
891 debug_scsi("iscsi_eh_host_reset wait for relogin\n");
892 wait_event_interruptible(conn->ehwait,
893 session->state == ISCSI_STATE_TERMINATE ||
894 session->state == ISCSI_STATE_LOGGED_IN ||
656cffc9 895 session->state == ISCSI_STATE_RECOVERY_FAILED);
7996a778
MC		 896 if (signal_pending(current))
897 flush_signals(current);
898
899 spin_lock_bh(&session->lock);
900 if (session->state == ISCSI_STATE_LOGGED_IN)
be2df72e 901 printk(KERN_INFO "iscsi: host reset succeeded\n");
7996a778
MC		 902 else
903 goto failed;
904 spin_unlock_bh(&session->lock);
905
906 return SUCCESS;
907}
908EXPORT_SYMBOL_GPL(iscsi_eh_host_reset);
909
910static void iscsi_tmabort_timedout(unsigned long data)
911{
912 struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)data;
913 struct iscsi_conn *conn = ctask->conn;
914 struct iscsi_session *session = conn->session;
915
916 spin_lock(&session->lock);
917 if (conn->tmabort_state == TMABORT_INITIAL) {
918 conn->tmabort_state = TMABORT_TIMEDOUT;
919 debug_scsi("tmabort timedout [sc %p itt 0x%x]\n",
920 ctask->sc, ctask->itt);
921 /* unblock eh_abort() */
922 wake_up(&conn->ehwait);
923 }
924 spin_unlock(&session->lock);
925}
926
927/* must be called with the mutex lock */
928static int iscsi_exec_abort_task(struct scsi_cmnd *sc,
929 struct iscsi_cmd_task *ctask)
930{
931 struct iscsi_conn *conn = ctask->conn;
932 struct iscsi_session *session = conn->session;
933 struct iscsi_tm *hdr = &conn->tmhdr;
934 int rc;
935
936 /*
937 * ctask timed out but session is OK requests must be serialized.
938 */
939 memset(hdr, 0, sizeof(struct iscsi_tm));
940 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
941 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK;
942 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
943 memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
944 hdr->rtt = ctask->hdr->itt;
945 hdr->refcmdsn = ctask->hdr->cmdsn;
946
947 rc = iscsi_conn_send_generic(conn, (struct iscsi_hdr *)hdr,
948 NULL, 0);
949 if (rc) {
950 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
951 debug_scsi("abort sent failure [itt 0x%x] %d", ctask->itt, rc);
952 return rc;
953 }
954
955 debug_scsi("abort sent [itt 0x%x]\n", ctask->itt);
956
957 spin_lock_bh(&session->lock);
958 ctask->mtask = (struct iscsi_mgmt_task *)
959 session->mgmt_cmds[(hdr->itt & ISCSI_ITT_MASK) -
960 ISCSI_MGMT_ITT_OFFSET];
961
962 if (conn->tmabort_state == TMABORT_INITIAL) {
963 conn->tmfcmd_pdus_cnt++;
964 conn->tmabort_timer.expires = 10*HZ + jiffies;
965 conn->tmabort_timer.function = iscsi_tmabort_timedout;
966 conn->tmabort_timer.data = (unsigned long)ctask;
967 add_timer(&conn->tmabort_timer);
968 debug_scsi("abort set timeout [itt 0x%x]", ctask->itt);
969 }
970 spin_unlock_bh(&session->lock);
971 mutex_unlock(&conn->xmitmutex);
972
973 /*
974 * block eh thread until:
975 *
976 * 1) abort response
977 * 2) abort timeout
978 * 3) session is terminated or restarted or userspace has
979 * given up on recovery
980 */
981 wait_event_interruptible(conn->ehwait,
982 sc->SCp.phase != session->age ||
983 session->state != ISCSI_STATE_LOGGED_IN ||
656cffc9 984 conn->tmabort_state != TMABORT_INITIAL);
7996a778
MC		 985 if (signal_pending(current))
986 flush_signals(current);
987 del_timer_sync(&conn->tmabort_timer);
988
989 mutex_lock(&conn->xmitmutex);
990 return 0;
991}
992
993/*
994 * xmit mutex and session lock must be held
995 */
b6c395ed
MC		 996static struct iscsi_mgmt_task *
997iscsi_remove_mgmt_task(struct kfifo *fifo, uint32_t itt)
998{
999 int i, nr_tasks = __kfifo_len(fifo) / sizeof(void*);
1000 struct iscsi_mgmt_task *task;
1001
1002 debug_scsi("searching %d tasks\n", nr_tasks);
1003
1004 for (i = 0; i < nr_tasks; i++) {
1005 __kfifo_get(fifo, (void*)&task, sizeof(void*));
1006 debug_scsi("check task %u\n", task->itt);
1007
1008 if (task->itt == itt) {
1009 debug_scsi("matched task\n");
1010 return task;
1011 }
7996a778 1012
b6c395ed
MC		 1013 __kfifo_put(fifo, (void*)&task, sizeof(void*));
1014 }
1015 return NULL;
1016}
7996a778
MC		 1017
1018static int iscsi_ctask_mtask_cleanup(struct iscsi_cmd_task *ctask)
1019{
1020 struct iscsi_conn *conn = ctask->conn;
1021 struct iscsi_session *session = conn->session;
1022
1023 if (!ctask->mtask)
1024 return -EINVAL;
1025
1026 if (!iscsi_remove_mgmt_task(conn->immqueue, ctask->mtask->itt))
1027 list_del(&ctask->mtask->running);
1028 __kfifo_put(session->mgmtpool.queue, (void*)&ctask->mtask,
1029 sizeof(void*));
1030 ctask->mtask = NULL;
1031 return 0;
1032}
1033
1034/*
1035 * session lock and xmitmutex must be held
1036 */
1037static void fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
1038 int err)
1039{
1040 struct scsi_cmnd *sc;
1041
7996a778
MC		 1042 sc = ctask->sc;
1043 if (!sc)
1044 return;
7ea8b828
MC		 1045
1046 conn->session->tt->cleanup_cmd_task(conn, ctask);
1047 iscsi_ctask_mtask_cleanup(ctask);
1048
7996a778
MC		 1049 sc->result = err;
1050 sc->resid = sc->request_bufflen;
1051 iscsi_complete_command(conn->session, ctask);
1052}
1053
1054int iscsi_eh_abort(struct scsi_cmnd *sc)
1055{
1056 struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)sc->SCp.ptr;
1057 struct iscsi_conn *conn = ctask->conn;
1058 struct iscsi_session *session = conn->session;
7996a778
MC		 1059 int rc;
1060
1061 conn->eh_abort_cnt++;
1062 debug_scsi("aborting [sc %p itt 0x%x]\n", sc, ctask->itt);
1063
1064 mutex_lock(&conn->xmitmutex);
1065 spin_lock_bh(&session->lock);
1066
1067 /*
1068 * If we are not logged in or we have started a new session
1069 * then let the host reset code handle this
1070 */
1071 if (session->state != ISCSI_STATE_LOGGED_IN ||
1072 sc->SCp.phase != session->age)
1073 goto failed;
1074
1075 /* ctask completed before time out */
7ea8b828
MC		 1076 if (!ctask->sc) {
1077 spin_unlock_bh(&session->lock);
1078 debug_scsi("sc completed while abort in progress\n");
1079 goto success_rel_mutex;
1080 }
7996a778
MC		 1081
1082 /* what should we do here ? */
1083 if (conn->ctask == ctask) {
be2df72e
OG		 1084 printk(KERN_INFO "iscsi: sc %p itt 0x%x partially sent. "
1085 "Failing abort\n", sc, ctask->itt);
7996a778
MC		 1086 goto failed;
1087 }
1088
b6c395ed 1089 if (ctask->state == ISCSI_TASK_PENDING)
7ea8b828 1090 goto success_cleanup;
7996a778
MC		 1091
1092 conn->tmabort_state = TMABORT_INITIAL;
1093
1094 spin_unlock_bh(&session->lock);
1095 rc = iscsi_exec_abort_task(sc, ctask);
1096 spin_lock_bh(&session->lock);
1097
7996a778
MC		 1098 if (rc || sc->SCp.phase != session->age ||
1099 session->state != ISCSI_STATE_LOGGED_IN)
1100 goto failed;
7ea8b828 1101 iscsi_ctask_mtask_cleanup(ctask);
7996a778 1102
7ea8b828
MC		 1103 switch (conn->tmabort_state) {
1104 case TMABORT_SUCCESS:
1105 goto success_cleanup;
1106 case TMABORT_NOT_FOUND:
1107 if (!ctask->sc) {
1108 /* ctask completed before tmf abort response */
1109 spin_unlock_bh(&session->lock);
1110 debug_scsi("sc completed while abort in progress\n");
1111 goto success_rel_mutex;
1112 }
1113 /* fall through */
1114 default:
1115 /* timedout or failed */
7996a778
MC		 1116 spin_unlock_bh(&session->lock);
1117 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1118 spin_lock_bh(&session->lock);
1119 goto failed;
1120 }
1121
7ea8b828 1122success_cleanup:
7996a778
MC		 1123 debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
1124 spin_unlock_bh(&session->lock);
1125
1126 /*
1127 * clean up task if aborted. we have the xmitmutex so grab
1128 * the recv lock as a writer
1129 */
1130 write_lock_bh(conn->recv_lock);
1131 spin_lock(&session->lock);
1132 fail_command(conn, ctask, DID_ABORT << 16);
1133 spin_unlock(&session->lock);
1134 write_unlock_bh(conn->recv_lock);
1135
7ea8b828 1136success_rel_mutex:
7996a778
MC		 1137 mutex_unlock(&conn->xmitmutex);
1138 return SUCCESS;
1139
1140failed:
1141 spin_unlock_bh(&session->lock);
1142 mutex_unlock(&conn->xmitmutex);
1143
1144 debug_scsi("abort failed [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
1145 return FAILED;
1146}
1147EXPORT_SYMBOL_GPL(iscsi_eh_abort);
1148
1149int
1150iscsi_pool_init(struct iscsi_queue *q, int max, void ***items, int item_size)
1151{
1152 int i;
1153
1154 *items = kmalloc(max * sizeof(void*), GFP_KERNEL);
1155 if (*items == NULL)
1156 return -ENOMEM;
1157
1158 q->max = max;
1159 q->pool = kmalloc(max * sizeof(void*), GFP_KERNEL);
1160 if (q->pool == NULL) {
1161 kfree(*items);
1162 return -ENOMEM;
1163 }
1164
1165 q->queue = kfifo_init((void*)q->pool, max * sizeof(void*),
1166 GFP_KERNEL, NULL);
1167 if (q->queue == ERR_PTR(-ENOMEM)) {
1168 kfree(q->pool);
1169 kfree(*items);
1170 return -ENOMEM;
1171 }
1172
1173 for (i = 0; i < max; i++) {
1174 q->pool[i] = kmalloc(item_size, GFP_KERNEL);
1175 if (q->pool[i] == NULL) {
1176 int j;
1177
1178 for (j = 0; j < i; j++)
1179 kfree(q->pool[j]);
1180
1181 kfifo_free(q->queue);
1182 kfree(q->pool);
1183 kfree(*items);
1184 return -ENOMEM;
1185 }
1186 memset(q->pool[i], 0, item_size);
1187 (*items)[i] = q->pool[i];
1188 __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*));
1189 }
1190 return 0;
1191}
1192EXPORT_SYMBOL_GPL(iscsi_pool_init);
1193
1194void iscsi_pool_free(struct iscsi_queue *q, void **items)
1195{
1196 int i;
1197
1198 for (i = 0; i < q->max; i++)
1199 kfree(items[i]);
1200 kfree(q->pool);
1201 kfree(items);
1202}
1203EXPORT_SYMBOL_GPL(iscsi_pool_free);
1204
1205/*
1206 * iSCSI Session's hostdata organization:
1207 *
1208 * *------------------* <== hostdata_session(host->hostdata)
1209 * | ptr to class sess|
1210 * |------------------| <== iscsi_hostdata(host->hostdata)
1211 * | iscsi_session |
1212 * *------------------*
1213 */
1214
1215#define hostdata_privsize(_sz) (sizeof(unsigned long) + _sz + \
1216 _sz % sizeof(unsigned long))
1217
1218#define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata))
1219
1220/**
1221 * iscsi_session_setup - create iscsi cls session and host and session
1222 * @scsit: scsi transport template
1223 * @iscsit: iscsi transport template
1224 * @initial_cmdsn: initial CmdSN
1225 * @hostno: host no allocated
1226 *
1227 * This can be used by software iscsi_transports that allocate
1228 * a session per scsi host.
1229 **/
1230struct iscsi_cls_session *
1231iscsi_session_setup(struct iscsi_transport *iscsit,
1232 struct scsi_transport_template *scsit,
1233 int cmd_task_size, int mgmt_task_size,
1234 uint32_t initial_cmdsn, uint32_t *hostno)
1235{
1236 struct Scsi_Host *shost;
1237 struct iscsi_session *session;
1238 struct iscsi_cls_session *cls_session;
1239 int cmd_i;
1240
1241 shost = scsi_host_alloc(iscsit->host_template,
1242 hostdata_privsize(sizeof(*session)));
1243 if (!shost)
1244 return NULL;
1245
1246 shost->max_id = 1;
1247 shost->max_channel = 0;
1248 shost->max_lun = iscsit->max_lun;
1249 shost->max_cmd_len = iscsit->max_cmd_len;
1250 shost->transportt = scsit;
1251 shost->transportt->create_work_queue = 1;
1252 *hostno = shost->host_no;
1253
1254 session = iscsi_hostdata(shost->hostdata);
1255 memset(session, 0, sizeof(struct iscsi_session));
1256 session->host = shost;
1257 session->state = ISCSI_STATE_FREE;
1258 session->mgmtpool_max = ISCSI_MGMT_CMDS_MAX;
1259 session->cmds_max = ISCSI_XMIT_CMDS_MAX;
1260 session->cmdsn = initial_cmdsn;
1261 session->exp_cmdsn = initial_cmdsn + 1;
1262 session->max_cmdsn = initial_cmdsn + 1;
1263 session->max_r2t = 1;
1264 session->tt = iscsit;
1265
1266 /* initialize SCSI PDU commands pool */
1267 if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
1268 (void***)&session->cmds,
1269 cmd_task_size + sizeof(struct iscsi_cmd_task)))
1270 goto cmdpool_alloc_fail;
1271
1272 /* pre-format cmds pool with ITT */
1273 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
1274 struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
1275
1276 if (cmd_task_size)
1277 ctask->dd_data = &ctask[1];
1278 ctask->itt = cmd_i;
b6c395ed 1279 INIT_LIST_HEAD(&ctask->running);
7996a778
MC		 1280 }
1281
1282 spin_lock_init(&session->lock);
1283 INIT_LIST_HEAD(&session->connections);
1284
1285 /* initialize immediate command pool */
1286 if (iscsi_pool_init(&session->mgmtpool, session->mgmtpool_max,
1287 (void***)&session->mgmt_cmds,
1288 mgmt_task_size + sizeof(struct iscsi_mgmt_task)))
1289 goto mgmtpool_alloc_fail;
1290
1291
1292 /* pre-format immediate cmds pool with ITT */
1293 for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) {
1294 struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i];
1295
1296 if (mgmt_task_size)
1297 mtask->dd_data = &mtask[1];
1298 mtask->itt = ISCSI_MGMT_ITT_OFFSET + cmd_i;
b6c395ed 1299 INIT_LIST_HEAD(&mtask->running);
7996a778
MC		 1300 }
1301
1302 if (scsi_add_host(shost, NULL))
1303 goto add_host_fail;
1304
f53a88da
MC		 1305 if (!try_module_get(iscsit->owner))
1306 goto cls_session_fail;
1307
6a8a0d36 1308 cls_session = iscsi_create_session(shost, iscsit, 0);
7996a778 1309 if (!cls_session)
f53a88da 1310 goto module_put;
7996a778
MC		 1311 *(unsigned long*)shost->hostdata = (unsigned long)cls_session;
1312
1313 return cls_session;
1314
f53a88da
MC		 1315module_put:
1316 module_put(iscsit->owner);
7996a778
MC		 1317cls_session_fail:
1318 scsi_remove_host(shost);
1319add_host_fail:
7996a778
MC		 1320 iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
1321mgmtpool_alloc_fail:
1322 iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
1323cmdpool_alloc_fail:
1324 scsi_host_put(shost);
1325 return NULL;
1326}
1327EXPORT_SYMBOL_GPL(iscsi_session_setup);
1328
1329/**
1330 * iscsi_session_teardown - destroy session, host, and cls_session
1331 * shost: scsi host
1332 *
1333 * This can be used by software iscsi_transports that allocate
1334 * a session per scsi host.
1335 **/
1336void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
1337{
1338 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
1339 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
7996a778
MC		 1340
1341 scsi_remove_host(shost);
1342
7996a778
MC		 1343 iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
1344 iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
1345
1346 iscsi_destroy_session(cls_session);
1347 scsi_host_put(shost);
f53a88da 1348 module_put(cls_session->transport->owner);
7996a778
MC		 1349}
1350EXPORT_SYMBOL_GPL(iscsi_session_teardown);
1351
1352/**
1353 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
1354 * @cls_session: iscsi_cls_session
1355 * @conn_idx: cid
1356 **/
1357struct iscsi_cls_conn *
1358iscsi_conn_setup(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
1359{
1360 struct iscsi_session *session = class_to_transport_session(cls_session);
1361 struct iscsi_conn *conn;
1362 struct iscsi_cls_conn *cls_conn;
d36ab6f3 1363 char *data;
7996a778
MC		 1364
1365 cls_conn = iscsi_create_conn(cls_session, conn_idx);
1366 if (!cls_conn)
1367 return NULL;
1368 conn = cls_conn->dd_data;
1369 memset(conn, 0, sizeof(*conn));
1370
1371 conn->session = session;
1372 conn->cls_conn = cls_conn;
1373 conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
1374 conn->id = conn_idx;
1375 conn->exp_statsn = 0;
1376 conn->tmabort_state = TMABORT_INITIAL;
1377 INIT_LIST_HEAD(&conn->run_list);
1378 INIT_LIST_HEAD(&conn->mgmt_run_list);
b6c395ed 1379 INIT_LIST_HEAD(&conn->xmitqueue);
7996a778
MC		 1380
1381 /* initialize general immediate & non-immediate PDU commands queue */
1382 conn->immqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*),
1383 GFP_KERNEL, NULL);
1384 if (conn->immqueue == ERR_PTR(-ENOMEM))
1385 goto immqueue_alloc_fail;
1386
1387 conn->mgmtqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*),
1388 GFP_KERNEL, NULL);
1389 if (conn->mgmtqueue == ERR_PTR(-ENOMEM))
1390 goto mgmtqueue_alloc_fail;
1391
1392 INIT_WORK(&conn->xmitwork, iscsi_xmitworker, conn);
1393
1394 /* allocate login_mtask used for the login/text sequences */
1395 spin_lock_bh(&session->lock);
1396 if (!__kfifo_get(session->mgmtpool.queue,
1397 (void*)&conn->login_mtask,
1398 sizeof(void*))) {
1399 spin_unlock_bh(&session->lock);
1400 goto login_mtask_alloc_fail;
1401 }
1402 spin_unlock_bh(&session->lock);
1403
d36ab6f3
MC		 1404 data = kmalloc(DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH, GFP_KERNEL);
1405 if (!data)
1406 goto login_mtask_data_alloc_fail;
1407 conn->login_mtask->data = data;
1408
7996a778
MC		 1409 init_timer(&conn->tmabort_timer);
1410 mutex_init(&conn->xmitmutex);
1411 init_waitqueue_head(&conn->ehwait);
1412
1413 return cls_conn;
1414
d36ab6f3
MC		 1415login_mtask_data_alloc_fail:
1416 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
1417 sizeof(void*));
7996a778
MC		 1418login_mtask_alloc_fail:
1419 kfifo_free(conn->mgmtqueue);
1420mgmtqueue_alloc_fail:
1421 kfifo_free(conn->immqueue);
1422immqueue_alloc_fail:
7996a778
MC		 1423 iscsi_destroy_conn(cls_conn);
1424 return NULL;
1425}
1426EXPORT_SYMBOL_GPL(iscsi_conn_setup);
1427
1428/**
1429 * iscsi_conn_teardown - teardown iscsi connection
1430 * cls_conn: iscsi class connection
1431 *
1432 * TODO: we may need to make this into a two step process
1433 * like scsi-mls remove + put host
1434 */
1435void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
1436{
1437 struct iscsi_conn *conn = cls_conn->dd_data;
1438 struct iscsi_session *session = conn->session;
1439 unsigned long flags;
1440
7996a778 1441 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
67a61114 1442 mutex_lock(&conn->xmitmutex);
7996a778
MC		 1443
1444 spin_lock_bh(&session->lock);
1445 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
1446 if (session->leadconn == conn) {
1447 /*
1448 * leading connection? then give up on recovery.
1449 */
1450 session->state = ISCSI_STATE_TERMINATE;
1451 wake_up(&conn->ehwait);
1452 }
1453 spin_unlock_bh(&session->lock);
1454
1455 mutex_unlock(&conn->xmitmutex);
1456
1457 /*
1458 * Block until all in-progress commands for this connection
1459 * time out or fail.
1460 */
1461 for (;;) {
1462 spin_lock_irqsave(session->host->host_lock, flags);
1463 if (!session->host->host_busy) { /* OK for ERL == 0 */
1464 spin_unlock_irqrestore(session->host->host_lock, flags);
1465 break;
1466 }
1467 spin_unlock_irqrestore(session->host->host_lock, flags);
1468 msleep_interruptible(500);
be2df72e
OG		 1469 printk(KERN_INFO "iscsi: scsi conn_destroy(): host_busy %d "
1470 "host_failed %d\n", session->host->host_busy,
1471 session->host->host_failed);
7996a778
MC		 1472 /*
1473 * force eh_abort() to unblock
1474 */
1475 wake_up(&conn->ehwait);
1476 }
1477
1478 spin_lock_bh(&session->lock);
d36ab6f3 1479 kfree(conn->login_mtask->data);
7996a778
MC		 1480 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
1481 sizeof(void*));
1482 list_del(&conn->item);
1483 if (list_empty(&session->connections))
1484 session->leadconn = NULL;
1485 if (session->leadconn && session->leadconn == conn)
1486 session->leadconn = container_of(session->connections.next,
1487 struct iscsi_conn, item);
1488
1489 if (session->leadconn == NULL)
1490 /* no connections exits.. reset sequencing */
1491 session->cmdsn = session->max_cmdsn = session->exp_cmdsn = 1;
1492 spin_unlock_bh(&session->lock);
1493
7996a778
MC		 1494 kfifo_free(conn->immqueue);
1495 kfifo_free(conn->mgmtqueue);
1496
1497 iscsi_destroy_conn(cls_conn);
1498}
1499EXPORT_SYMBOL_GPL(iscsi_conn_teardown);
1500
1501int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
1502{
1503 struct iscsi_conn *conn = cls_conn->dd_data;
1504 struct iscsi_session *session = conn->session;
1505
1506 if (session == NULL) {
1507 printk(KERN_ERR "iscsi: can't start unbound connection\n");
1508 return -EPERM;
1509 }
1510
1511 spin_lock_bh(&session->lock);
1512 conn->c_stage = ISCSI_CONN_STARTED;
1513 session->state = ISCSI_STATE_LOGGED_IN;
1514
1515 switch(conn->stop_stage) {
1516 case STOP_CONN_RECOVER:
1517 /*
1518 * unblock eh_abort() if it is blocked. re-try all
1519 * commands after successful recovery
1520 */
7996a778
MC		 1521 conn->stop_stage = 0;
1522 conn->tmabort_state = TMABORT_INITIAL;
1523 session->age++;
7996a778
MC		 1524 spin_unlock_bh(&session->lock);
1525
1526 iscsi_unblock_session(session_to_cls(session));
1527 wake_up(&conn->ehwait);
1528 return 0;
1529 case STOP_CONN_TERM:
7996a778 1530 conn->stop_stage = 0;
7996a778
MC		 1531 break;
1532 default:
1533 break;
1534 }
1535 spin_unlock_bh(&session->lock);
1536
1537 return 0;
1538}
1539EXPORT_SYMBOL_GPL(iscsi_conn_start);
1540
1541static void
1542flush_control_queues(struct iscsi_session *session, struct iscsi_conn *conn)
1543{
1544 struct iscsi_mgmt_task *mtask, *tmp;
1545
1546 /* handle pending */
1547 while (__kfifo_get(conn->immqueue, (void*)&mtask, sizeof(void*)) ||
1548 __kfifo_get(conn->mgmtqueue, (void*)&mtask, sizeof(void*))) {
1549 if (mtask == conn->login_mtask)
1550 continue;
1551 debug_scsi("flushing pending mgmt task itt 0x%x\n", mtask->itt);
1552 __kfifo_put(session->mgmtpool.queue, (void*)&mtask,
1553 sizeof(void*));
1554 }
1555
1556 /* handle running */
1557 list_for_each_entry_safe(mtask, tmp, &conn->mgmt_run_list, running) {
1558 debug_scsi("flushing running mgmt task itt 0x%x\n", mtask->itt);
ed2abc7f
MC		 1559 list_del(&mtask->running);
1560
7996a778
MC		 1561 if (mtask == conn->login_mtask)
1562 continue;
ed2abc7f 1563 __kfifo_put(session->mgmtpool.queue, (void*)&mtask,
7996a778
MC		 1564 sizeof(void*));
1565 }
1566
1567 conn->mtask = NULL;
1568}
1569
1570/* Fail commands. Mutex and session lock held and recv side suspended */
1571static void fail_all_commands(struct iscsi_conn *conn)
1572{
1573 struct iscsi_cmd_task *ctask, *tmp;
1574
1575 /* flush pending */
b6c395ed 1576 list_for_each_entry_safe(ctask, tmp, &conn->xmitqueue, running) {
7996a778
MC		 1577 debug_scsi("failing pending sc %p itt 0x%x\n", ctask->sc,
1578 ctask->itt);
1579 fail_command(conn, ctask, DID_BUS_BUSY << 16);
1580 }
1581
1582 /* fail all other running */
1583 list_for_each_entry_safe(ctask, tmp, &conn->run_list, running) {
1584 debug_scsi("failing in progress sc %p itt 0x%x\n",
1585 ctask->sc, ctask->itt);
1586 fail_command(conn, ctask, DID_BUS_BUSY << 16);
1587 }
1588
1589 conn->ctask = NULL;
1590}
1591
656cffc9
MC		 1592static void iscsi_start_session_recovery(struct iscsi_session *session,
1593 struct iscsi_conn *conn, int flag)
7996a778 1594{
ed2abc7f
MC		 1595 int old_stop_stage;
1596
7996a778 1597 spin_lock_bh(&session->lock);
ed2abc7f 1598 if (conn->stop_stage == STOP_CONN_TERM) {
7996a778
MC		 1599 spin_unlock_bh(&session->lock);
1600 return;
1601 }
ed2abc7f
MC		 1602
1603 /*
1604 * When this is called for the in_login state, we only want to clean
67a61114
MC		 1605 * up the login task and connection. We do not need to block and set
1606 * the recovery state again
ed2abc7f 1607 */
67a61114
MC		 1608 if (flag == STOP_CONN_TERM)
1609 session->state = ISCSI_STATE_TERMINATE;
1610 else if (conn->stop_stage != STOP_CONN_RECOVER)
1611 session->state = ISCSI_STATE_IN_RECOVERY;
ed2abc7f
MC		 1612
1613 old_stop_stage = conn->stop_stage;
7996a778 1614 conn->stop_stage = flag;
67a61114
MC		 1615 conn->c_stage = ISCSI_CONN_STOPPED;
1616 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
7996a778
MC		 1617 spin_unlock_bh(&session->lock);
1618
1c83469d
MC		 1619 write_lock_bh(conn->recv_lock);
1620 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
1621 write_unlock_bh(conn->recv_lock);
7996a778
MC		 1622
1623 mutex_lock(&conn->xmitmutex);
7996a778
MC		 1624 /*
1625 * for connection level recovery we should not calculate
1626 * header digest. conn->hdr_size used for optimization
1627 * in hdr_extract() and will be re-negotiated at
1628 * set_param() time.
1629 */
1630 if (flag == STOP_CONN_RECOVER) {
1631 conn->hdrdgst_en = 0;
1632 conn->datadgst_en = 0;
656cffc9 1633 if (session->state == ISCSI_STATE_IN_RECOVERY &&
67a61114
MC		 1634 old_stop_stage != STOP_CONN_RECOVER) {
1635 debug_scsi("blocking session\n");
7996a778 1636 iscsi_block_session(session_to_cls(session));
67a61114 1637 }
7996a778 1638 }
656cffc9 1639
656cffc9
MC		 1640 /*
1641 * flush queues.
1642 */
1643 spin_lock_bh(&session->lock);
1644 fail_all_commands(conn);
1645 flush_control_queues(session, conn);
1646 spin_unlock_bh(&session->lock);
1647
7996a778
MC		 1648 mutex_unlock(&conn->xmitmutex);
1649}
7996a778
MC		 1650
1651void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
1652{
1653 struct iscsi_conn *conn = cls_conn->dd_data;
1654 struct iscsi_session *session = conn->session;
1655
1656 switch (flag) {
1657 case STOP_CONN_RECOVER:
1658 case STOP_CONN_TERM:
1659 iscsi_start_session_recovery(session, conn, flag);
8d2860b3 1660 break;
7996a778 1661 default:
be2df72e 1662 printk(KERN_ERR "iscsi: invalid stop flag %d\n", flag);
7996a778
MC		 1663 }
1664}
1665EXPORT_SYMBOL_GPL(iscsi_conn_stop);
1666
1667int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
1668 struct iscsi_cls_conn *cls_conn, int is_leading)
1669{
1670 struct iscsi_session *session = class_to_transport_session(cls_session);
1671 struct iscsi_conn *tmp = ERR_PTR(-EEXIST), *conn = cls_conn->dd_data;
1672
1673 /* lookup for existing connection */
1674 spin_lock_bh(&session->lock);
1675 list_for_each_entry(tmp, &session->connections, item) {
1676 if (tmp == conn) {
1677 if (conn->c_stage != ISCSI_CONN_STOPPED ||
1678 conn->stop_stage == STOP_CONN_TERM) {
be2df72e 1679 printk(KERN_ERR "iscsi: can't bind "
7996a778
MC		 1680 "non-stopped connection (%d:%d)\n",
1681 conn->c_stage, conn->stop_stage);
1682 spin_unlock_bh(&session->lock);
1683 return -EIO;
1684 }
1685 break;
1686 }
1687 }
1688 if (tmp != conn) {
1689 /* bind new iSCSI connection to session */
1690 conn->session = session;
1691 list_add(&conn->item, &session->connections);
1692 }
1693 spin_unlock_bh(&session->lock);
1694
1695 if (is_leading)
1696 session->leadconn = conn;
1697
1698 /*
1699 * Unblock xmitworker(), Login Phase will pass through.
1700 */
1701 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
1702 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1703 return 0;
1704}
1705EXPORT_SYMBOL_GPL(iscsi_conn_bind);
1706
a54a52ca
MC		 1707
1708int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
1709 enum iscsi_param param, char *buf, int buflen)
1710{
1711 struct iscsi_conn *conn = cls_conn->dd_data;
1712 struct iscsi_session *session = conn->session;
1713 uint32_t value;
1714
1715 switch(param) {
1716 case ISCSI_PARAM_MAX_RECV_DLENGTH:
1717 sscanf(buf, "%d", &conn->max_recv_dlength);
1718 break;
1719 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
1720 sscanf(buf, "%d", &conn->max_xmit_dlength);
1721 break;
1722 case ISCSI_PARAM_HDRDGST_EN:
1723 sscanf(buf, "%d", &conn->hdrdgst_en);
1724 break;
1725 case ISCSI_PARAM_DATADGST_EN:
1726 sscanf(buf, "%d", &conn->datadgst_en);
1727 break;
1728 case ISCSI_PARAM_INITIAL_R2T_EN:
1729 sscanf(buf, "%d", &session->initial_r2t_en);
1730 break;
1731 case ISCSI_PARAM_MAX_R2T:
1732 sscanf(buf, "%d", &session->max_r2t);
1733 break;
1734 case ISCSI_PARAM_IMM_DATA_EN:
1735 sscanf(buf, "%d", &session->imm_data_en);
1736 break;
1737 case ISCSI_PARAM_FIRST_BURST:
1738 sscanf(buf, "%d", &session->first_burst);
1739 break;
1740 case ISCSI_PARAM_MAX_BURST:
1741 sscanf(buf, "%d", &session->max_burst);
1742 break;
1743 case ISCSI_PARAM_PDU_INORDER_EN:
1744 sscanf(buf, "%d", &session->pdu_inorder_en);
1745 break;
1746 case ISCSI_PARAM_DATASEQ_INORDER_EN:
1747 sscanf(buf, "%d", &session->dataseq_inorder_en);
1748 break;
1749 case ISCSI_PARAM_ERL:
1750 sscanf(buf, "%d", &session->erl);
1751 break;
1752 case ISCSI_PARAM_IFMARKER_EN:
1753 sscanf(buf, "%d", &value);
1754 BUG_ON(value);
1755 break;
1756 case ISCSI_PARAM_OFMARKER_EN:
1757 sscanf(buf, "%d", &value);
1758 BUG_ON(value);
1759 break;
1760 case ISCSI_PARAM_EXP_STATSN:
1761 sscanf(buf, "%u", &conn->exp_statsn);
1762 break;
1763 case ISCSI_PARAM_TARGET_NAME:
1764 /* this should not change between logins */
1765 if (session->targetname)
1766 break;
1767
1768 session->targetname = kstrdup(buf, GFP_KERNEL);
1769 if (!session->targetname)
1770 return -ENOMEM;
1771 break;
1772 case ISCSI_PARAM_TPGT:
1773 sscanf(buf, "%d", &session->tpgt);
1774 break;
1775 case ISCSI_PARAM_PERSISTENT_PORT:
1776 sscanf(buf, "%d", &conn->persistent_port);
1777 break;
1778 case ISCSI_PARAM_PERSISTENT_ADDRESS:
1779 /*
1780 * this is the address returned in discovery so it should
1781 * not change between logins.
1782 */
1783 if (conn->persistent_address)
1784 break;
1785
1786 conn->persistent_address = kstrdup(buf, GFP_KERNEL);
1787 if (!conn->persistent_address)
1788 return -ENOMEM;
1789 break;
1790 default:
1791 return -ENOSYS;
1792 }
1793
1794 return 0;
1795}
1796EXPORT_SYMBOL_GPL(iscsi_set_param);
1797
1798int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
1799 enum iscsi_param param, char *buf)
1800{
1801 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
1802 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
1803 int len;
1804
1805 switch(param) {
1806 case ISCSI_PARAM_INITIAL_R2T_EN:
1807 len = sprintf(buf, "%d\n", session->initial_r2t_en);
1808 break;
1809 case ISCSI_PARAM_MAX_R2T:
1810 len = sprintf(buf, "%hu\n", session->max_r2t);
1811 break;
1812 case ISCSI_PARAM_IMM_DATA_EN:
1813 len = sprintf(buf, "%d\n", session->imm_data_en);
1814 break;
1815 case ISCSI_PARAM_FIRST_BURST:
1816 len = sprintf(buf, "%u\n", session->first_burst);
1817 break;
1818 case ISCSI_PARAM_MAX_BURST:
1819 len = sprintf(buf, "%u\n", session->max_burst);
1820 break;
1821 case ISCSI_PARAM_PDU_INORDER_EN:
1822 len = sprintf(buf, "%d\n", session->pdu_inorder_en);
1823 break;
1824 case ISCSI_PARAM_DATASEQ_INORDER_EN:
1825 len = sprintf(buf, "%d\n", session->dataseq_inorder_en);
1826 break;
1827 case ISCSI_PARAM_ERL:
1828 len = sprintf(buf, "%d\n", session->erl);
1829 break;
1830 case ISCSI_PARAM_TARGET_NAME:
1831 len = sprintf(buf, "%s\n", session->targetname);
1832 break;
1833 case ISCSI_PARAM_TPGT:
1834 len = sprintf(buf, "%d\n", session->tpgt);
1835 break;
1836 default:
1837 return -ENOSYS;
1838 }
1839
1840 return len;
1841}
1842EXPORT_SYMBOL_GPL(iscsi_session_get_param);
1843
1844int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
1845 enum iscsi_param param, char *buf)
1846{
1847 struct iscsi_conn *conn = cls_conn->dd_data;
1848 int len;
1849
1850 switch(param) {
1851 case ISCSI_PARAM_MAX_RECV_DLENGTH:
1852 len = sprintf(buf, "%u\n", conn->max_recv_dlength);
1853 break;
1854 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
1855 len = sprintf(buf, "%u\n", conn->max_xmit_dlength);
1856 break;
1857 case ISCSI_PARAM_HDRDGST_EN:
1858 len = sprintf(buf, "%d\n", conn->hdrdgst_en);
1859 break;
1860 case ISCSI_PARAM_DATADGST_EN:
1861 len = sprintf(buf, "%d\n", conn->datadgst_en);
1862 break;
1863 case ISCSI_PARAM_IFMARKER_EN:
1864 len = sprintf(buf, "%d\n", conn->ifmarker_en);
1865 break;
1866 case ISCSI_PARAM_OFMARKER_EN:
1867 len = sprintf(buf, "%d\n", conn->ofmarker_en);
1868 break;
1869 case ISCSI_PARAM_EXP_STATSN:
1870 len = sprintf(buf, "%u\n", conn->exp_statsn);
1871 break;
1872 case ISCSI_PARAM_PERSISTENT_PORT:
1873 len = sprintf(buf, "%d\n", conn->persistent_port);
1874 break;
1875 case ISCSI_PARAM_PERSISTENT_ADDRESS:
1876 len = sprintf(buf, "%s\n", conn->persistent_address);
1877 break;
1878 default:
1879 return -ENOSYS;
1880 }
1881
1882 return len;
1883}
1884EXPORT_SYMBOL_GPL(iscsi_conn_get_param);
1885
7996a778
MC		 1886MODULE_AUTHOR("Mike Christie");
1887MODULE_DESCRIPTION("iSCSI library functions");
1888MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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