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[SCSI] libiscsi: fix missed iscsi_task_put in xmit error path
[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,
ffd0436e 71 struct iscsi_data *hdr)
7996a778
MC		 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);
ffd0436e 84 hdr->offset = cpu_to_be32(ctask->unsol_offset);
7996a778
MC		 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;
ffd0436e 89 ctask->unsol_offset += ctask->data_count;
7996a778
MC		 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}
97EXPORT_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 */
106static 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
ffd0436e 125 ctask->data_count = 0;
7996a778
MC		 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;
ffd0436e 144 ctask->unsol_offset = 0;
7996a778
MC		 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
ffd0436e 158 if (!session->initial_r2t_en) {
7996a778
MC		 159 ctask->unsol_count = min(session->first_burst,
160 ctask->total_length) - ctask->imm_count;
ffd0436e
MC		 161 ctask->unsol_offset = ctask->imm_count;
162 }
163
7996a778
MC		 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}
178EXPORT_SYMBOL_GPL(iscsi_prep_scsi_cmd_pdu);
179
180/**
181 * iscsi_complete_command - return command back to scsi-ml
7996a778
MC		 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 */
60ecebf5 188static void iscsi_complete_command(struct iscsi_cmd_task *ctask)
7996a778 189{
60ecebf5 190 struct iscsi_session *session = ctask->conn->session;
7996a778
MC		 191 struct scsi_cmnd *sc = ctask->sc;
192
b6c395ed 193 ctask->state = ISCSI_TASK_COMPLETED;
7996a778 194 ctask->sc = NULL;
f47f2cf5
MC		 195 /* SCSI eh reuses commands to verify us */
196 sc->SCp.ptr = NULL;
7996a778
MC		 197 list_del_init(&ctask->running);
198 __kfifo_put(session->cmdpool.queue, (void*)&ctask, sizeof(void*));
199 sc->scsi_done(sc);
200}
201
60ecebf5
MC		 202static void __iscsi_get_ctask(struct iscsi_cmd_task *ctask)
203{
204 atomic_inc(&ctask->refcount);
205}
206
207static 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
214static void __iscsi_put_ctask(struct iscsi_cmd_task *ctask)
215{
e648f63c 216 if (atomic_dec_and_test(&ctask->refcount))
60ecebf5 217 iscsi_complete_command(ctask);
60ecebf5
MC		 218}
219
220static 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
7996a778
MC		 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 **/
238static 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) {
266invalid_datalen:
be2df72e
OG		 267 printk(KERN_ERR "iscsi: Got CHECK_CONDITION but "
268 "invalid data buffer size of %d\n", datalen);
7996a778
MC		 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
298out:
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
60ecebf5 303 __iscsi_put_ctask(ctask);
7996a778
MC		 304 return rc;
305}
306
7ea8b828
MC		 307static 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
62f38300
MC		 326static 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
7996a778
MC		 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 */
361int __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++;
60ecebf5 391 __iscsi_put_ctask(ctask);
7996a778
MC		 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
8d2860b3
MC		 408 rc = iscsi_check_assign_cmdsn(session,
409 (struct iscsi_nopin*)hdr);
410 if (rc)
411 goto done;
412
7996a778 413 switch(opcode) {
8d2860b3 414 case ISCSI_OP_LOGOUT_RSP:
c8dc1e52
MC		 415 if (datalen) {
416 rc = ISCSI_ERR_PROTO;
417 break;
418 }
8d2860b3
MC		 419 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
420 /* fall through */
7996a778
MC		 421 case ISCSI_OP_LOGIN_RSP:
422 case ISCSI_OP_TEXT_RSP:
8d2860b3
MC		 423 /*
424 * login related PDU's exp_statsn is handled in
425 * userspace
426 */
40527afe
MC		 427 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
428 rc = ISCSI_ERR_CONN_FAILED;
7996a778
MC		 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:
7996a778
MC		 435 if (datalen) {
436 rc = ISCSI_ERR_PROTO;
437 break;
438 }
8d2860b3 439
7ea8b828 440 iscsi_tmf_rsp(conn, hdr);
7996a778
MC		 441 break;
442 case ISCSI_OP_NOOP_IN:
c8dc1e52 443 if (hdr->ttt != ISCSI_RESERVED_TAG || datalen) {
7996a778
MC		 444 rc = ISCSI_ERR_PROTO;
445 break;
446 }
7996a778
MC		 447 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
448
40527afe
MC		 449 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
450 rc = ISCSI_ERR_CONN_FAILED;
7996a778
MC		 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) {
62f38300
MC		 461 rc = iscsi_check_assign_cmdsn(session,
462 (struct iscsi_nopin*)hdr);
463 if (rc)
464 goto done;
465
7996a778
MC		 466 switch(opcode) {
467 case ISCSI_OP_NOOP_IN:
40527afe 468 if (datalen) {
7996a778 469 rc = ISCSI_ERR_PROTO;
40527afe
MC		 470 break;
471 }
472
40527afe
MC		 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;
7996a778
MC		 478 break;
479 case ISCSI_OP_REJECT:
62f38300
MC		 480 rc = iscsi_handle_reject(conn, hdr, data, datalen);
481 break;
7996a778 482 case ISCSI_OP_ASYNC_EVENT:
8d2860b3 483 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
7996a778
MC		 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
8d2860b3 494done:
7996a778
MC		 495 return rc;
496}
497EXPORT_SYMBOL_GPL(__iscsi_complete_pdu);
498
499int 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}
509EXPORT_SYMBOL_GPL(iscsi_complete_pdu);
510
511/* verify itt (itt encoding: age+cid+itt) */
512int 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)) {
be2df72e 522 printk(KERN_ERR "iscsi: received itt %x expected "
7996a778
MC		 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)) {
be2df72e 530 printk(KERN_ERR "iscsi: received itt %x, expected "
7996a778
MC		 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) {
be2df72e 542 printk(KERN_INFO "iscsi: dropping ctask with "
7996a778
MC		 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) {
be2df72e 549 printk(KERN_ERR "iscsi: ctask's session age %d, "
7996a778
MC		 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}
559EXPORT_SYMBOL_GPL(iscsi_verify_itt);
560
561void 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);
656cffc9
MC		 567 if (session->state == ISCSI_STATE_FAILED) {
568 spin_unlock_irqrestore(&session->lock, flags);
569 return;
570 }
571
67a61114 572 if (conn->stop_stage == 0)
7996a778
MC		 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}
579EXPORT_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 **/
590static int iscsi_data_xmit(struct iscsi_conn *conn)
591{
592 struct iscsi_transport *tt;
3219e529 593 int rc = 0;
7996a778
MC		 594
595 if (unlikely(conn->suspend_tx)) {
596 debug_scsi("conn %d Tx suspended!\n", conn->id);
3219e529 597 return -ENODATA;
7996a778
MC		 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) {
60ecebf5 617 iscsi_get_ctask(conn->ctask);
3219e529 618 rc = tt->xmit_cmd_task(conn, conn->ctask);
60ecebf5 619 iscsi_put_ctask(conn->ctask);
3219e529 620 if (rc)
7996a778
MC		 621 goto again;
622 /* done with this in-progress ctask */
623 conn->ctask = NULL;
624 }
625 if (conn->mtask) {
3219e529
MC		 626 rc = tt->xmit_mgmt_task(conn, conn->mtask);
627 if (rc)
7996a778
MC		 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*))) {
994442e8 637 spin_lock_bh(&conn->session->lock);
7996a778
MC		 638 list_add_tail(&conn->mtask->running,
639 &conn->mgmt_run_list);
994442e8 640 spin_unlock_bh(&conn->session->lock);
3219e529
MC		 641 rc = tt->xmit_mgmt_task(conn, conn->mtask);
642 if (rc)
7996a778
MC		 643 goto again;
644 }
645 /* done with this mtask */
646 conn->mtask = NULL;
647 }
648
649 /* process command queue */
b6c395ed
MC		 650 spin_lock_bh(&conn->session->lock);
651 while (!list_empty(&conn->xmitqueue)) {
7996a778
MC		 652 /*
653 * iscsi tcp may readd the task to the xmitqueue to send
654 * write data
655 */
b6c395ed
MC		 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);
60ecebf5 660 __iscsi_get_ctask(conn->ctask);
994442e8 661 spin_unlock_bh(&conn->session->lock);
b6c395ed 662
3219e529 663 rc = tt->xmit_cmd_task(conn, conn->ctask);
60ecebf5 664
b6c395ed 665 spin_lock_bh(&conn->session->lock);
60ecebf5
MC		 666 __iscsi_put_ctask(conn->ctask);
667 if (rc) {
668 spin_unlock_bh(&conn->session->lock);
669 goto again;
670 }
7996a778 671 }
b6c395ed 672 spin_unlock_bh(&conn->session->lock);
7996a778
MC		 673 /* done with this ctask */
674 conn->ctask = NULL;
675
676 /* process the rest control plane PDUs, if any */
677 if (unlikely(__kfifo_len(conn->mgmtqueue))) {
678 while (__kfifo_get(conn->mgmtqueue, (void*)&conn->mtask,
679 sizeof(void*))) {
994442e8 680 spin_lock_bh(&conn->session->lock);
7996a778
MC		 681 list_add_tail(&conn->mtask->running,
682 &conn->mgmt_run_list);
994442e8 683 spin_unlock_bh(&conn->session->lock);
3219e529
MC		 684 rc = tt->xmit_mgmt_task(conn, conn->mtask);
685 if (rc)
7996a778
MC		 686 goto again;
687 }
688 /* done with this mtask */
689 conn->mtask = NULL;
690 }
691
3219e529 692 return -ENODATA;
7996a778
MC		 693
694again:
695 if (unlikely(conn->suspend_tx))
3219e529 696 return -ENODATA;
7996a778 697
3219e529 698 return rc;
7996a778
MC		 699}
700
701static void iscsi_xmitworker(void *data)
702{
703 struct iscsi_conn *conn = data;
3219e529 704 int rc;
7996a778
MC		 705 /*
706 * serialize Xmit worker on a per-connection basis.
707 */
708 mutex_lock(&conn->xmitmutex);
3219e529
MC		 709 do {
710 rc = iscsi_data_xmit(conn);
711 } while (rc >= 0 || rc == -EAGAIN);
7996a778
MC		 712 mutex_unlock(&conn->xmitmutex);
713}
714
715enum {
716 FAILURE_BAD_HOST = 1,
717 FAILURE_SESSION_FAILED,
718 FAILURE_SESSION_FREED,
719 FAILURE_WINDOW_CLOSED,
60ecebf5 720 FAILURE_OOM,
7996a778 721 FAILURE_SESSION_TERMINATE,
656cffc9 722 FAILURE_SESSION_IN_RECOVERY,
7996a778
MC		 723 FAILURE_SESSION_RECOVERY_TIMEOUT,
724};
725
726int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
727{
728 struct Scsi_Host *host;
729 int reason = 0;
730 struct iscsi_session *session;
731 struct iscsi_conn *conn;
732 struct iscsi_cmd_task *ctask = NULL;
733
734 sc->scsi_done = done;
735 sc->result = 0;
f47f2cf5 736 sc->SCp.ptr = NULL;
7996a778
MC		 737
738 host = sc->device->host;
739 session = iscsi_hostdata(host->hostdata);
740
741 spin_lock(&session->lock);
742
656cffc9
MC		 743 /*
744 * ISCSI_STATE_FAILED is a temp. state. The recovery
745 * code will decide what is best to do with command queued
746 * during this time
747 */
748 if (session->state != ISCSI_STATE_LOGGED_IN &&
749 session->state != ISCSI_STATE_FAILED) {
750 /*
751 * to handle the race between when we set the recovery state
752 * and block the session we requeue here (commands could
753 * be entering our queuecommand while a block is starting
754 * up because the block code is not locked)
755 */
756 if (session->state == ISCSI_STATE_IN_RECOVERY) {
757 reason = FAILURE_SESSION_IN_RECOVERY;
67a61114 758 goto reject;
7996a778 759 }
656cffc9
MC		 760
761 if (session->state == ISCSI_STATE_RECOVERY_FAILED)
762 reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
763 else if (session->state == ISCSI_STATE_TERMINATE)
764 reason = FAILURE_SESSION_TERMINATE;
765 else
766 reason = FAILURE_SESSION_FREED;
7996a778
MC		 767 goto fault;
768 }
769
770 /*
771 * Check for iSCSI window and take care of CmdSN wrap-around
772 */
773 if ((int)(session->max_cmdsn - session->cmdsn) < 0) {
774 reason = FAILURE_WINDOW_CLOSED;
775 goto reject;
776 }
777
778 conn = session->leadconn;
98644047
MC		 779 if (!conn) {
780 reason = FAILURE_SESSION_FREED;
781 goto fault;
782 }
7996a778 783
60ecebf5
MC		 784 if (!__kfifo_get(session->cmdpool.queue, (void*)&ctask,
785 sizeof(void*))) {
786 reason = FAILURE_OOM;
787 goto reject;
788 }
7996a778
MC		 789 sc->SCp.phase = session->age;
790 sc->SCp.ptr = (char *)ctask;
791
60ecebf5 792 atomic_set(&ctask->refcount, 1);
b6c395ed 793 ctask->state = ISCSI_TASK_PENDING;
7996a778
MC		 794 ctask->mtask = NULL;
795 ctask->conn = conn;
796 ctask->sc = sc;
797 INIT_LIST_HEAD(&ctask->running);
798 ctask->total_length = sc->request_bufflen;
799 iscsi_prep_scsi_cmd_pdu(ctask);
800
801 session->tt->init_cmd_task(ctask);
802
b6c395ed 803 list_add_tail(&ctask->running, &conn->xmitqueue);
7996a778 804 debug_scsi(
f47f2cf5
MC		 805 "ctask enq [%s cid %d sc %p cdb 0x%x itt 0x%x len %d cmdsn %d "
806 "win %d]\n",
7996a778 807 sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read",
f47f2cf5 808 conn->id, sc, sc->cmnd[0], ctask->itt, sc->request_bufflen,
7996a778
MC		 809 session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1);
810 spin_unlock(&session->lock);
811
812 scsi_queue_work(host, &conn->xmitwork);
813 return 0;
814
815reject:
816 spin_unlock(&session->lock);
817 debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason);
818 return SCSI_MLQUEUE_HOST_BUSY;
819
820fault:
821 spin_unlock(&session->lock);
be2df72e 822 printk(KERN_ERR "iscsi: cmd 0x%x is not queued (%d)\n",
7996a778
MC		 823 sc->cmnd[0], reason);
824 sc->result = (DID_NO_CONNECT << 16);
825 sc->resid = sc->request_bufflen;
826 sc->scsi_done(sc);
827 return 0;
828}
829EXPORT_SYMBOL_GPL(iscsi_queuecommand);
830
831int iscsi_change_queue_depth(struct scsi_device *sdev, int depth)
832{
833 if (depth > ISCSI_MAX_CMD_PER_LUN)
834 depth = ISCSI_MAX_CMD_PER_LUN;
835 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
836 return sdev->queue_depth;
837}
838EXPORT_SYMBOL_GPL(iscsi_change_queue_depth);
839
840static int
841iscsi_conn_send_generic(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
842 char *data, uint32_t data_size)
843{
844 struct iscsi_session *session = conn->session;
845 struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
846 struct iscsi_mgmt_task *mtask;
847
848 spin_lock_bh(&session->lock);
849 if (session->state == ISCSI_STATE_TERMINATE) {
850 spin_unlock_bh(&session->lock);
851 return -EPERM;
852 }
853 if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) ||
854 hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
855 /*
856 * Login and Text are sent serially, in
857 * request-followed-by-response sequence.
858 * Same mtask can be used. Same ITT must be used.
859 * Note that login_mtask is preallocated at conn_create().
860 */
861 mtask = conn->login_mtask;
862 else {
656cffc9
MC		 863 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
864 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
7996a778 865
8d2860b3 866 nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
7996a778
MC		 867 if (!__kfifo_get(session->mgmtpool.queue,
868 (void*)&mtask, sizeof(void*))) {
869 spin_unlock_bh(&session->lock);
870 return -ENOSPC;
871 }
872 }
873
874 /*
8d2860b3 875 * pre-format CmdSN for outgoing PDU.
7996a778
MC		 876 */
877 if (hdr->itt != cpu_to_be32(ISCSI_RESERVED_TAG)) {
878 hdr->itt = mtask->itt | (conn->id << ISCSI_CID_SHIFT) |
879 (session->age << ISCSI_AGE_SHIFT);
880 nop->cmdsn = cpu_to_be32(session->cmdsn);
881 if (conn->c_stage == ISCSI_CONN_STARTED &&
882 !(hdr->opcode & ISCSI_OP_IMMEDIATE))
883 session->cmdsn++;
884 } else
885 /* do not advance CmdSN */
886 nop->cmdsn = cpu_to_be32(session->cmdsn);
887
7996a778
MC		 888 if (data_size) {
889 memcpy(mtask->data, data, data_size);
890 mtask->data_count = data_size;
891 } else
892 mtask->data_count = 0;
893
894 INIT_LIST_HEAD(&mtask->running);
895 memcpy(mtask->hdr, hdr, sizeof(struct iscsi_hdr));
896 if (session->tt->init_mgmt_task)
897 session->tt->init_mgmt_task(conn, mtask, data, data_size);
898 spin_unlock_bh(&session->lock);
899
900 debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n",
901 hdr->opcode, hdr->itt, data_size);
902
903 /*
904 * since send_pdu() could be called at least from two contexts,
905 * we need to serialize __kfifo_put, so we don't have to take
906 * additional lock on fast data-path
907 */
908 if (hdr->opcode & ISCSI_OP_IMMEDIATE)
909 __kfifo_put(conn->immqueue, (void*)&mtask, sizeof(void*));
910 else
911 __kfifo_put(conn->mgmtqueue, (void*)&mtask, sizeof(void*));
912
913 scsi_queue_work(session->host, &conn->xmitwork);
914 return 0;
915}
916
917int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr,
918 char *data, uint32_t data_size)
919{
920 struct iscsi_conn *conn = cls_conn->dd_data;
921 int rc;
922
923 mutex_lock(&conn->xmitmutex);
924 rc = iscsi_conn_send_generic(conn, hdr, data, data_size);
925 mutex_unlock(&conn->xmitmutex);
926
927 return rc;
928}
929EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu);
930
931void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
932{
933 struct iscsi_session *session = class_to_transport_session(cls_session);
934 struct iscsi_conn *conn = session->leadconn;
935
936 spin_lock_bh(&session->lock);
937 if (session->state != ISCSI_STATE_LOGGED_IN) {
656cffc9 938 session->state = ISCSI_STATE_RECOVERY_FAILED;
7996a778
MC		 939 if (conn)
940 wake_up(&conn->ehwait);
941 }
942 spin_unlock_bh(&session->lock);
943}
944EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
945
946int iscsi_eh_host_reset(struct scsi_cmnd *sc)
947{
948 struct Scsi_Host *host = sc->device->host;
949 struct iscsi_session *session = iscsi_hostdata(host->hostdata);
950 struct iscsi_conn *conn = session->leadconn;
951 int fail_session = 0;
952
953 spin_lock_bh(&session->lock);
954 if (session->state == ISCSI_STATE_TERMINATE) {
955failed:
956 debug_scsi("failing host reset: session terminated "
957 "[CID %d age %d]", conn->id, session->age);
958 spin_unlock_bh(&session->lock);
959 return FAILED;
960 }
961
962 if (sc->SCp.phase == session->age) {
963 debug_scsi("failing connection CID %d due to SCSI host reset",
964 conn->id);
965 fail_session = 1;
966 }
967 spin_unlock_bh(&session->lock);
968
969 /*
970 * we drop the lock here but the leadconn cannot be destoyed while
971 * we are in the scsi eh
972 */
656cffc9 973 if (fail_session)
7996a778 974 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
7996a778
MC		 975
976 debug_scsi("iscsi_eh_host_reset wait for relogin\n");
977 wait_event_interruptible(conn->ehwait,
978 session->state == ISCSI_STATE_TERMINATE ||
979 session->state == ISCSI_STATE_LOGGED_IN ||
656cffc9 980 session->state == ISCSI_STATE_RECOVERY_FAILED);
7996a778
MC		 981 if (signal_pending(current))
982 flush_signals(current);
983
984 spin_lock_bh(&session->lock);
985 if (session->state == ISCSI_STATE_LOGGED_IN)
be2df72e 986 printk(KERN_INFO "iscsi: host reset succeeded\n");
7996a778
MC		 987 else
988 goto failed;
989 spin_unlock_bh(&session->lock);
990
991 return SUCCESS;
992}
993EXPORT_SYMBOL_GPL(iscsi_eh_host_reset);
994
995static void iscsi_tmabort_timedout(unsigned long data)
996{
997 struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)data;
998 struct iscsi_conn *conn = ctask->conn;
999 struct iscsi_session *session = conn->session;
1000
1001 spin_lock(&session->lock);
1002 if (conn->tmabort_state == TMABORT_INITIAL) {
1003 conn->tmabort_state = TMABORT_TIMEDOUT;
1004 debug_scsi("tmabort timedout [sc %p itt 0x%x]\n",
1005 ctask->sc, ctask->itt);
1006 /* unblock eh_abort() */
1007 wake_up(&conn->ehwait);
1008 }
1009 spin_unlock(&session->lock);
1010}
1011
1012/* must be called with the mutex lock */
1013static int iscsi_exec_abort_task(struct scsi_cmnd *sc,
1014 struct iscsi_cmd_task *ctask)
1015{
1016 struct iscsi_conn *conn = ctask->conn;
1017 struct iscsi_session *session = conn->session;
1018 struct iscsi_tm *hdr = &conn->tmhdr;
1019 int rc;
1020
1021 /*
1022 * ctask timed out but session is OK requests must be serialized.
1023 */
1024 memset(hdr, 0, sizeof(struct iscsi_tm));
1025 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
1026 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK;
1027 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
1028 memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
1029 hdr->rtt = ctask->hdr->itt;
1030 hdr->refcmdsn = ctask->hdr->cmdsn;
1031
1032 rc = iscsi_conn_send_generic(conn, (struct iscsi_hdr *)hdr,
1033 NULL, 0);
1034 if (rc) {
1035 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1036 debug_scsi("abort sent failure [itt 0x%x] %d", ctask->itt, rc);
1037 return rc;
1038 }
1039
1040 debug_scsi("abort sent [itt 0x%x]\n", ctask->itt);
1041
1042 spin_lock_bh(&session->lock);
1043 ctask->mtask = (struct iscsi_mgmt_task *)
1044 session->mgmt_cmds[(hdr->itt & ISCSI_ITT_MASK) -
1045 ISCSI_MGMT_ITT_OFFSET];
1046
1047 if (conn->tmabort_state == TMABORT_INITIAL) {
1048 conn->tmfcmd_pdus_cnt++;
1049 conn->tmabort_timer.expires = 10*HZ + jiffies;
1050 conn->tmabort_timer.function = iscsi_tmabort_timedout;
1051 conn->tmabort_timer.data = (unsigned long)ctask;
1052 add_timer(&conn->tmabort_timer);
1053 debug_scsi("abort set timeout [itt 0x%x]", ctask->itt);
1054 }
1055 spin_unlock_bh(&session->lock);
1056 mutex_unlock(&conn->xmitmutex);
1057
1058 /*
1059 * block eh thread until:
1060 *
1061 * 1) abort response
1062 * 2) abort timeout
1063 * 3) session is terminated or restarted or userspace has
1064 * given up on recovery
1065 */
1066 wait_event_interruptible(conn->ehwait,
1067 sc->SCp.phase != session->age ||
1068 session->state != ISCSI_STATE_LOGGED_IN ||
656cffc9 1069 conn->tmabort_state != TMABORT_INITIAL);
7996a778
MC		 1070 if (signal_pending(current))
1071 flush_signals(current);
1072 del_timer_sync(&conn->tmabort_timer);
1073
1074 mutex_lock(&conn->xmitmutex);
1075 return 0;
1076}
1077
1078/*
1079 * xmit mutex and session lock must be held
1080 */
b6c395ed
MC		 1081static struct iscsi_mgmt_task *
1082iscsi_remove_mgmt_task(struct kfifo *fifo, uint32_t itt)
1083{
1084 int i, nr_tasks = __kfifo_len(fifo) / sizeof(void*);
1085 struct iscsi_mgmt_task *task;
1086
1087 debug_scsi("searching %d tasks\n", nr_tasks);
1088
1089 for (i = 0; i < nr_tasks; i++) {
1090 __kfifo_get(fifo, (void*)&task, sizeof(void*));
1091 debug_scsi("check task %u\n", task->itt);
1092
1093 if (task->itt == itt) {
1094 debug_scsi("matched task\n");
1095 return task;
1096 }
7996a778 1097
b6c395ed
MC		 1098 __kfifo_put(fifo, (void*)&task, sizeof(void*));
1099 }
1100 return NULL;
1101}
7996a778
MC		 1102
1103static int iscsi_ctask_mtask_cleanup(struct iscsi_cmd_task *ctask)
1104{
1105 struct iscsi_conn *conn = ctask->conn;
1106 struct iscsi_session *session = conn->session;
1107
1108 if (!ctask->mtask)
1109 return -EINVAL;
1110
1111 if (!iscsi_remove_mgmt_task(conn->immqueue, ctask->mtask->itt))
1112 list_del(&ctask->mtask->running);
1113 __kfifo_put(session->mgmtpool.queue, (void*)&ctask->mtask,
1114 sizeof(void*));
1115 ctask->mtask = NULL;
1116 return 0;
1117}
1118
1119/*
1120 * session lock and xmitmutex must be held
1121 */
1122static void fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
1123 int err)
1124{
1125 struct scsi_cmnd *sc;
1126
7996a778
MC		 1127 sc = ctask->sc;
1128 if (!sc)
1129 return;
e648f63c
MC		 1130
1131 conn->session->tt->cleanup_cmd_task(conn, ctask);
7ea8b828
MC		 1132 iscsi_ctask_mtask_cleanup(ctask);
1133
7996a778
MC		 1134 sc->result = err;
1135 sc->resid = sc->request_bufflen;
e648f63c 1136 /* release ref from queuecommand */
60ecebf5 1137 __iscsi_put_ctask(ctask);
7996a778
MC		 1138}
1139
1140int iscsi_eh_abort(struct scsi_cmnd *sc)
1141{
f47f2cf5
MC		 1142 struct iscsi_cmd_task *ctask;
1143 struct iscsi_conn *conn;
1144 struct iscsi_session *session;
7996a778
MC		 1145 int rc;
1146
f47f2cf5
MC		 1147 /*
1148 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
1149 * got the command.
1150 */
1151 if (!sc->SCp.ptr) {
1152 debug_scsi("sc never reached iscsi layer or it completed.\n");
1153 return SUCCESS;
1154 }
1155
1156 ctask = (struct iscsi_cmd_task *)sc->SCp.ptr;
1157 conn = ctask->conn;
1158 session = conn->session;
1159
7996a778
MC		 1160 conn->eh_abort_cnt++;
1161 debug_scsi("aborting [sc %p itt 0x%x]\n", sc, ctask->itt);
1162
1163 mutex_lock(&conn->xmitmutex);
1164 spin_lock_bh(&session->lock);
1165
1166 /*
1167 * If we are not logged in or we have started a new session
1168 * then let the host reset code handle this
1169 */
1170 if (session->state != ISCSI_STATE_LOGGED_IN ||
1171 sc->SCp.phase != session->age)
1172 goto failed;
1173
1174 /* ctask completed before time out */
7ea8b828
MC		 1175 if (!ctask->sc) {
1176 spin_unlock_bh(&session->lock);
1177 debug_scsi("sc completed while abort in progress\n");
1178 goto success_rel_mutex;
1179 }
7996a778
MC		 1180
1181 /* what should we do here ? */
1182 if (conn->ctask == ctask) {
be2df72e
OG		 1183 printk(KERN_INFO "iscsi: sc %p itt 0x%x partially sent. "
1184 "Failing abort\n", sc, ctask->itt);
7996a778
MC		 1185 goto failed;
1186 }
1187
b6c395ed 1188 if (ctask->state == ISCSI_TASK_PENDING)
7ea8b828 1189 goto success_cleanup;
7996a778
MC		 1190
1191 conn->tmabort_state = TMABORT_INITIAL;
1192
1193 spin_unlock_bh(&session->lock);
1194 rc = iscsi_exec_abort_task(sc, ctask);
1195 spin_lock_bh(&session->lock);
1196
7996a778
MC		 1197 if (rc || sc->SCp.phase != session->age ||
1198 session->state != ISCSI_STATE_LOGGED_IN)
1199 goto failed;
7ea8b828 1200 iscsi_ctask_mtask_cleanup(ctask);
7996a778 1201
7ea8b828
MC		 1202 switch (conn->tmabort_state) {
1203 case TMABORT_SUCCESS:
1204 goto success_cleanup;
1205 case TMABORT_NOT_FOUND:
1206 if (!ctask->sc) {
1207 /* ctask completed before tmf abort response */
1208 spin_unlock_bh(&session->lock);
1209 debug_scsi("sc completed while abort in progress\n");
1210 goto success_rel_mutex;
1211 }
1212 /* fall through */
1213 default:
1214 /* timedout or failed */
7996a778
MC		 1215 spin_unlock_bh(&session->lock);
1216 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1217 spin_lock_bh(&session->lock);
1218 goto failed;
1219 }
1220
7ea8b828 1221success_cleanup:
7996a778
MC		 1222 debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
1223 spin_unlock_bh(&session->lock);
1224
1225 /*
1226 * clean up task if aborted. we have the xmitmutex so grab
1227 * the recv lock as a writer
1228 */
1229 write_lock_bh(conn->recv_lock);
1230 spin_lock(&session->lock);
1231 fail_command(conn, ctask, DID_ABORT << 16);
1232 spin_unlock(&session->lock);
1233 write_unlock_bh(conn->recv_lock);
1234
7ea8b828 1235success_rel_mutex:
7996a778
MC		 1236 mutex_unlock(&conn->xmitmutex);
1237 return SUCCESS;
1238
1239failed:
1240 spin_unlock_bh(&session->lock);
1241 mutex_unlock(&conn->xmitmutex);
1242
1243 debug_scsi("abort failed [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
1244 return FAILED;
1245}
1246EXPORT_SYMBOL_GPL(iscsi_eh_abort);
1247
1248int
1249iscsi_pool_init(struct iscsi_queue *q, int max, void ***items, int item_size)
1250{
1251 int i;
1252
1253 *items = kmalloc(max * sizeof(void*), GFP_KERNEL);
1254 if (*items == NULL)
1255 return -ENOMEM;
1256
1257 q->max = max;
1258 q->pool = kmalloc(max * sizeof(void*), GFP_KERNEL);
1259 if (q->pool == NULL) {
1260 kfree(*items);
1261 return -ENOMEM;
1262 }
1263
1264 q->queue = kfifo_init((void*)q->pool, max * sizeof(void*),
1265 GFP_KERNEL, NULL);
1266 if (q->queue == ERR_PTR(-ENOMEM)) {
1267 kfree(q->pool);
1268 kfree(*items);
1269 return -ENOMEM;
1270 }
1271
1272 for (i = 0; i < max; i++) {
1273 q->pool[i] = kmalloc(item_size, GFP_KERNEL);
1274 if (q->pool[i] == NULL) {
1275 int j;
1276
1277 for (j = 0; j < i; j++)
1278 kfree(q->pool[j]);
1279
1280 kfifo_free(q->queue);
1281 kfree(q->pool);
1282 kfree(*items);
1283 return -ENOMEM;
1284 }
1285 memset(q->pool[i], 0, item_size);
1286 (*items)[i] = q->pool[i];
1287 __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*));
1288 }
1289 return 0;
1290}
1291EXPORT_SYMBOL_GPL(iscsi_pool_init);
1292
1293void iscsi_pool_free(struct iscsi_queue *q, void **items)
1294{
1295 int i;
1296
1297 for (i = 0; i < q->max; i++)
1298 kfree(items[i]);
1299 kfree(q->pool);
1300 kfree(items);
1301}
1302EXPORT_SYMBOL_GPL(iscsi_pool_free);
1303
1304/*
1305 * iSCSI Session's hostdata organization:
1306 *
1307 * *------------------* <== hostdata_session(host->hostdata)
1308 * | ptr to class sess|
1309 * |------------------| <== iscsi_hostdata(host->hostdata)
1310 * | iscsi_session |
1311 * *------------------*
1312 */
1313
1314#define hostdata_privsize(_sz) (sizeof(unsigned long) + _sz + \
1315 _sz % sizeof(unsigned long))
1316
1317#define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata))
1318
1319/**
1320 * iscsi_session_setup - create iscsi cls session and host and session
1321 * @scsit: scsi transport template
1322 * @iscsit: iscsi transport template
1323 * @initial_cmdsn: initial CmdSN
1324 * @hostno: host no allocated
1325 *
1326 * This can be used by software iscsi_transports that allocate
1327 * a session per scsi host.
1328 **/
1329struct iscsi_cls_session *
1330iscsi_session_setup(struct iscsi_transport *iscsit,
1331 struct scsi_transport_template *scsit,
1332 int cmd_task_size, int mgmt_task_size,
1333 uint32_t initial_cmdsn, uint32_t *hostno)
1334{
1335 struct Scsi_Host *shost;
1336 struct iscsi_session *session;
1337 struct iscsi_cls_session *cls_session;
1338 int cmd_i;
1339
1340 shost = scsi_host_alloc(iscsit->host_template,
1341 hostdata_privsize(sizeof(*session)));
1342 if (!shost)
1343 return NULL;
1344
1345 shost->max_id = 1;
1346 shost->max_channel = 0;
1347 shost->max_lun = iscsit->max_lun;
1348 shost->max_cmd_len = iscsit->max_cmd_len;
1349 shost->transportt = scsit;
1350 shost->transportt->create_work_queue = 1;
1351 *hostno = shost->host_no;
1352
1353 session = iscsi_hostdata(shost->hostdata);
1354 memset(session, 0, sizeof(struct iscsi_session));
1355 session->host = shost;
1356 session->state = ISCSI_STATE_FREE;
1357 session->mgmtpool_max = ISCSI_MGMT_CMDS_MAX;
1358 session->cmds_max = ISCSI_XMIT_CMDS_MAX;
1359 session->cmdsn = initial_cmdsn;
1360 session->exp_cmdsn = initial_cmdsn + 1;
1361 session->max_cmdsn = initial_cmdsn + 1;
1362 session->max_r2t = 1;
1363 session->tt = iscsit;
1364
1365 /* initialize SCSI PDU commands pool */
1366 if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
1367 (void***)&session->cmds,
1368 cmd_task_size + sizeof(struct iscsi_cmd_task)))
1369 goto cmdpool_alloc_fail;
1370
1371 /* pre-format cmds pool with ITT */
1372 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
1373 struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
1374
1375 if (cmd_task_size)
1376 ctask->dd_data = &ctask[1];
1377 ctask->itt = cmd_i;
b6c395ed 1378 INIT_LIST_HEAD(&ctask->running);
7996a778
MC		 1379 }
1380
1381 spin_lock_init(&session->lock);
7996a778
MC		 1382
1383 /* initialize immediate command pool */
1384 if (iscsi_pool_init(&session->mgmtpool, session->mgmtpool_max,
1385 (void***)&session->mgmt_cmds,
1386 mgmt_task_size + sizeof(struct iscsi_mgmt_task)))
1387 goto mgmtpool_alloc_fail;
1388
1389
1390 /* pre-format immediate cmds pool with ITT */
1391 for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) {
1392 struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i];
1393
1394 if (mgmt_task_size)
1395 mtask->dd_data = &mtask[1];
1396 mtask->itt = ISCSI_MGMT_ITT_OFFSET + cmd_i;
b6c395ed 1397 INIT_LIST_HEAD(&mtask->running);
7996a778
MC		 1398 }
1399
1400 if (scsi_add_host(shost, NULL))
1401 goto add_host_fail;
1402
f53a88da
MC		 1403 if (!try_module_get(iscsit->owner))
1404 goto cls_session_fail;
1405
6a8a0d36 1406 cls_session = iscsi_create_session(shost, iscsit, 0);
7996a778 1407 if (!cls_session)
f53a88da 1408 goto module_put;
7996a778
MC		 1409 *(unsigned long*)shost->hostdata = (unsigned long)cls_session;
1410
1411 return cls_session;
1412
f53a88da
MC		 1413module_put:
1414 module_put(iscsit->owner);
7996a778
MC		 1415cls_session_fail:
1416 scsi_remove_host(shost);
1417add_host_fail:
7996a778
MC		 1418 iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
1419mgmtpool_alloc_fail:
1420 iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
1421cmdpool_alloc_fail:
1422 scsi_host_put(shost);
1423 return NULL;
1424}
1425EXPORT_SYMBOL_GPL(iscsi_session_setup);
1426
1427/**
1428 * iscsi_session_teardown - destroy session, host, and cls_session
1429 * shost: scsi host
1430 *
1431 * This can be used by software iscsi_transports that allocate
1432 * a session per scsi host.
1433 **/
1434void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
1435{
1436 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
1437 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
63f75cc8 1438 struct module *owner = cls_session->transport->owner;
7996a778
MC		 1439
1440 scsi_remove_host(shost);
1441
7996a778
MC		 1442 iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
1443 iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
1444
f3ff0c36
MC		 1445 kfree(session->targetname);
1446
7996a778
MC		 1447 iscsi_destroy_session(cls_session);
1448 scsi_host_put(shost);
63f75cc8 1449 module_put(owner);
7996a778
MC		 1450}
1451EXPORT_SYMBOL_GPL(iscsi_session_teardown);
1452
1453/**
1454 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
1455 * @cls_session: iscsi_cls_session
1456 * @conn_idx: cid
1457 **/
1458struct iscsi_cls_conn *
1459iscsi_conn_setup(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
1460{
1461 struct iscsi_session *session = class_to_transport_session(cls_session);
1462 struct iscsi_conn *conn;
1463 struct iscsi_cls_conn *cls_conn;
d36ab6f3 1464 char *data;
7996a778
MC		 1465
1466 cls_conn = iscsi_create_conn(cls_session, conn_idx);
1467 if (!cls_conn)
1468 return NULL;
1469 conn = cls_conn->dd_data;
1470 memset(conn, 0, sizeof(*conn));
1471
1472 conn->session = session;
1473 conn->cls_conn = cls_conn;
1474 conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
1475 conn->id = conn_idx;
1476 conn->exp_statsn = 0;
1477 conn->tmabort_state = TMABORT_INITIAL;
1478 INIT_LIST_HEAD(&conn->run_list);
1479 INIT_LIST_HEAD(&conn->mgmt_run_list);
b6c395ed 1480 INIT_LIST_HEAD(&conn->xmitqueue);
7996a778
MC		 1481
1482 /* initialize general immediate & non-immediate PDU commands queue */
1483 conn->immqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*),
1484 GFP_KERNEL, NULL);
1485 if (conn->immqueue == ERR_PTR(-ENOMEM))
1486 goto immqueue_alloc_fail;
1487
1488 conn->mgmtqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*),
1489 GFP_KERNEL, NULL);
1490 if (conn->mgmtqueue == ERR_PTR(-ENOMEM))
1491 goto mgmtqueue_alloc_fail;
1492
1493 INIT_WORK(&conn->xmitwork, iscsi_xmitworker, conn);
1494
1495 /* allocate login_mtask used for the login/text sequences */
1496 spin_lock_bh(&session->lock);
1497 if (!__kfifo_get(session->mgmtpool.queue,
1498 (void*)&conn->login_mtask,
1499 sizeof(void*))) {
1500 spin_unlock_bh(&session->lock);
1501 goto login_mtask_alloc_fail;
1502 }
1503 spin_unlock_bh(&session->lock);
1504
d36ab6f3
MC		 1505 data = kmalloc(DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH, GFP_KERNEL);
1506 if (!data)
1507 goto login_mtask_data_alloc_fail;
c8dc1e52 1508 conn->login_mtask->data = conn->data = data;
d36ab6f3 1509
7996a778
MC		 1510 init_timer(&conn->tmabort_timer);
1511 mutex_init(&conn->xmitmutex);
1512 init_waitqueue_head(&conn->ehwait);
1513
1514 return cls_conn;
1515
d36ab6f3
MC		 1516login_mtask_data_alloc_fail:
1517 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
1518 sizeof(void*));
7996a778
MC		 1519login_mtask_alloc_fail:
1520 kfifo_free(conn->mgmtqueue);
1521mgmtqueue_alloc_fail:
1522 kfifo_free(conn->immqueue);
1523immqueue_alloc_fail:
7996a778
MC		 1524 iscsi_destroy_conn(cls_conn);
1525 return NULL;
1526}
1527EXPORT_SYMBOL_GPL(iscsi_conn_setup);
1528
1529/**
1530 * iscsi_conn_teardown - teardown iscsi connection
1531 * cls_conn: iscsi class connection
1532 *
1533 * TODO: we may need to make this into a two step process
1534 * like scsi-mls remove + put host
1535 */
1536void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
1537{
1538 struct iscsi_conn *conn = cls_conn->dd_data;
1539 struct iscsi_session *session = conn->session;
1540 unsigned long flags;
1541
7996a778 1542 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
67a61114 1543 mutex_lock(&conn->xmitmutex);
7996a778
MC		 1544
1545 spin_lock_bh(&session->lock);
1546 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
1547 if (session->leadconn == conn) {
1548 /*
1549 * leading connection? then give up on recovery.
1550 */
1551 session->state = ISCSI_STATE_TERMINATE;
1552 wake_up(&conn->ehwait);
1553 }
1554 spin_unlock_bh(&session->lock);
1555
1556 mutex_unlock(&conn->xmitmutex);
1557
1558 /*
1559 * Block until all in-progress commands for this connection
1560 * time out or fail.
1561 */
1562 for (;;) {
1563 spin_lock_irqsave(session->host->host_lock, flags);
1564 if (!session->host->host_busy) { /* OK for ERL == 0 */
1565 spin_unlock_irqrestore(session->host->host_lock, flags);
1566 break;
1567 }
1568 spin_unlock_irqrestore(session->host->host_lock, flags);
1569 msleep_interruptible(500);
be2df72e
OG		 1570 printk(KERN_INFO "iscsi: scsi conn_destroy(): host_busy %d "
1571 "host_failed %d\n", session->host->host_busy,
1572 session->host->host_failed);
7996a778
MC		 1573 /*
1574 * force eh_abort() to unblock
1575 */
1576 wake_up(&conn->ehwait);
1577 }
1578
1579 spin_lock_bh(&session->lock);
c8dc1e52 1580 kfree(conn->data);
f3ff0c36 1581 kfree(conn->persistent_address);
7996a778
MC		 1582 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
1583 sizeof(void*));
98644047 1584 if (session->leadconn == conn) {
7996a778 1585 session->leadconn = NULL;
7996a778
MC		 1586 /* no connections exits.. reset sequencing */
1587 session->cmdsn = session->max_cmdsn = session->exp_cmdsn = 1;
98644047 1588 }
7996a778
MC		 1589 spin_unlock_bh(&session->lock);
1590
7996a778
MC		 1591 kfifo_free(conn->immqueue);
1592 kfifo_free(conn->mgmtqueue);
1593
1594 iscsi_destroy_conn(cls_conn);
1595}
1596EXPORT_SYMBOL_GPL(iscsi_conn_teardown);
1597
1598int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
1599{
1600 struct iscsi_conn *conn = cls_conn->dd_data;
1601 struct iscsi_session *session = conn->session;
1602
ffd0436e 1603 if (!session) {
7996a778
MC		 1604 printk(KERN_ERR "iscsi: can't start unbound connection\n");
1605 return -EPERM;
1606 }
1607
db98ccde
MC		 1608 if ((session->imm_data_en || !session->initial_r2t_en) &&
1609 session->first_burst > session->max_burst) {
ffd0436e
MC		 1610 printk("iscsi: invalid burst lengths: "
1611 "first_burst %d max_burst %d\n",
1612 session->first_burst, session->max_burst);
1613 return -EINVAL;
1614 }
1615
7996a778
MC		 1616 spin_lock_bh(&session->lock);
1617 conn->c_stage = ISCSI_CONN_STARTED;
1618 session->state = ISCSI_STATE_LOGGED_IN;
1619
1620 switch(conn->stop_stage) {
1621 case STOP_CONN_RECOVER:
1622 /*
1623 * unblock eh_abort() if it is blocked. re-try all
1624 * commands after successful recovery
1625 */
7996a778
MC		 1626 conn->stop_stage = 0;
1627 conn->tmabort_state = TMABORT_INITIAL;
1628 session->age++;
7996a778
MC		 1629 spin_unlock_bh(&session->lock);
1630
1631 iscsi_unblock_session(session_to_cls(session));
1632 wake_up(&conn->ehwait);
1633 return 0;
1634 case STOP_CONN_TERM:
7996a778 1635 conn->stop_stage = 0;
7996a778
MC		 1636 break;
1637 default:
1638 break;
1639 }
1640 spin_unlock_bh(&session->lock);
1641
1642 return 0;
1643}
1644EXPORT_SYMBOL_GPL(iscsi_conn_start);
1645
1646static void
1647flush_control_queues(struct iscsi_session *session, struct iscsi_conn *conn)
1648{
1649 struct iscsi_mgmt_task *mtask, *tmp;
1650
1651 /* handle pending */
1652 while (__kfifo_get(conn->immqueue, (void*)&mtask, sizeof(void*)) ||
1653 __kfifo_get(conn->mgmtqueue, (void*)&mtask, sizeof(void*))) {
1654 if (mtask == conn->login_mtask)
1655 continue;
1656 debug_scsi("flushing pending mgmt task itt 0x%x\n", mtask->itt);
1657 __kfifo_put(session->mgmtpool.queue, (void*)&mtask,
1658 sizeof(void*));
1659 }
1660
1661 /* handle running */
1662 list_for_each_entry_safe(mtask, tmp, &conn->mgmt_run_list, running) {
1663 debug_scsi("flushing running mgmt task itt 0x%x\n", mtask->itt);
ed2abc7f
MC		 1664 list_del(&mtask->running);
1665
7996a778
MC		 1666 if (mtask == conn->login_mtask)
1667 continue;
ed2abc7f 1668 __kfifo_put(session->mgmtpool.queue, (void*)&mtask,
7996a778
MC		 1669 sizeof(void*));
1670 }
1671
1672 conn->mtask = NULL;
1673}
1674
1675/* Fail commands. Mutex and session lock held and recv side suspended */
1676static void fail_all_commands(struct iscsi_conn *conn)
1677{
1678 struct iscsi_cmd_task *ctask, *tmp;
1679
1680 /* flush pending */
b6c395ed 1681 list_for_each_entry_safe(ctask, tmp, &conn->xmitqueue, running) {
7996a778
MC		 1682 debug_scsi("failing pending sc %p itt 0x%x\n", ctask->sc,
1683 ctask->itt);
1684 fail_command(conn, ctask, DID_BUS_BUSY << 16);
1685 }
1686
1687 /* fail all other running */
1688 list_for_each_entry_safe(ctask, tmp, &conn->run_list, running) {
1689 debug_scsi("failing in progress sc %p itt 0x%x\n",
1690 ctask->sc, ctask->itt);
1691 fail_command(conn, ctask, DID_BUS_BUSY << 16);
1692 }
1693
1694 conn->ctask = NULL;
1695}
1696
656cffc9
MC		 1697static void iscsi_start_session_recovery(struct iscsi_session *session,
1698 struct iscsi_conn *conn, int flag)
7996a778 1699{
ed2abc7f
MC		 1700 int old_stop_stage;
1701
7996a778 1702 spin_lock_bh(&session->lock);
ed2abc7f 1703 if (conn->stop_stage == STOP_CONN_TERM) {
7996a778
MC		 1704 spin_unlock_bh(&session->lock);
1705 return;
1706 }
ed2abc7f
MC		 1707
1708 /*
1709 * When this is called for the in_login state, we only want to clean
67a61114
MC		 1710 * up the login task and connection. We do not need to block and set
1711 * the recovery state again
ed2abc7f 1712 */
67a61114
MC		 1713 if (flag == STOP_CONN_TERM)
1714 session->state = ISCSI_STATE_TERMINATE;
1715 else if (conn->stop_stage != STOP_CONN_RECOVER)
1716 session->state = ISCSI_STATE_IN_RECOVERY;
ed2abc7f
MC		 1717
1718 old_stop_stage = conn->stop_stage;
7996a778 1719 conn->stop_stage = flag;
67a61114
MC		 1720 conn->c_stage = ISCSI_CONN_STOPPED;
1721 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
7996a778
MC		 1722 spin_unlock_bh(&session->lock);
1723
1c83469d
MC		 1724 write_lock_bh(conn->recv_lock);
1725 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
1726 write_unlock_bh(conn->recv_lock);
7996a778
MC		 1727
1728 mutex_lock(&conn->xmitmutex);
7996a778
MC		 1729 /*
1730 * for connection level recovery we should not calculate
1731 * header digest. conn->hdr_size used for optimization
1732 * in hdr_extract() and will be re-negotiated at
1733 * set_param() time.
1734 */
1735 if (flag == STOP_CONN_RECOVER) {
1736 conn->hdrdgst_en = 0;
1737 conn->datadgst_en = 0;
656cffc9 1738 if (session->state == ISCSI_STATE_IN_RECOVERY &&
67a61114
MC		 1739 old_stop_stage != STOP_CONN_RECOVER) {
1740 debug_scsi("blocking session\n");
7996a778 1741 iscsi_block_session(session_to_cls(session));
67a61114 1742 }
7996a778 1743 }
656cffc9 1744
656cffc9
MC		 1745 /*
1746 * flush queues.
1747 */
1748 spin_lock_bh(&session->lock);
1749 fail_all_commands(conn);
1750 flush_control_queues(session, conn);
1751 spin_unlock_bh(&session->lock);
1752
7996a778
MC		 1753 mutex_unlock(&conn->xmitmutex);
1754}
7996a778
MC		 1755
1756void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
1757{
1758 struct iscsi_conn *conn = cls_conn->dd_data;
1759 struct iscsi_session *session = conn->session;
1760
1761 switch (flag) {
1762 case STOP_CONN_RECOVER:
1763 case STOP_CONN_TERM:
1764 iscsi_start_session_recovery(session, conn, flag);
8d2860b3 1765 break;
7996a778 1766 default:
be2df72e 1767 printk(KERN_ERR "iscsi: invalid stop flag %d\n", flag);
7996a778
MC		 1768 }
1769}
1770EXPORT_SYMBOL_GPL(iscsi_conn_stop);
1771
1772int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
1773 struct iscsi_cls_conn *cls_conn, int is_leading)
1774{
1775 struct iscsi_session *session = class_to_transport_session(cls_session);
98644047 1776 struct iscsi_conn *conn = cls_conn->dd_data;
7996a778 1777
7996a778 1778 spin_lock_bh(&session->lock);
7996a778
MC		 1779 if (is_leading)
1780 session->leadconn = conn;
98644047 1781 spin_unlock_bh(&session->lock);
7996a778
MC		 1782
1783 /*
1784 * Unblock xmitworker(), Login Phase will pass through.
1785 */
1786 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
1787 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1788 return 0;
1789}
1790EXPORT_SYMBOL_GPL(iscsi_conn_bind);
1791
a54a52ca
MC		 1792
1793int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
1794 enum iscsi_param param, char *buf, int buflen)
1795{
1796 struct iscsi_conn *conn = cls_conn->dd_data;
1797 struct iscsi_session *session = conn->session;
1798 uint32_t value;
1799
1800 switch(param) {
1801 case ISCSI_PARAM_MAX_RECV_DLENGTH:
1802 sscanf(buf, "%d", &conn->max_recv_dlength);
1803 break;
1804 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
1805 sscanf(buf, "%d", &conn->max_xmit_dlength);
1806 break;
1807 case ISCSI_PARAM_HDRDGST_EN:
1808 sscanf(buf, "%d", &conn->hdrdgst_en);
1809 break;
1810 case ISCSI_PARAM_DATADGST_EN:
1811 sscanf(buf, "%d", &conn->datadgst_en);
1812 break;
1813 case ISCSI_PARAM_INITIAL_R2T_EN:
1814 sscanf(buf, "%d", &session->initial_r2t_en);
1815 break;
1816 case ISCSI_PARAM_MAX_R2T:
1817 sscanf(buf, "%d", &session->max_r2t);
1818 break;
1819 case ISCSI_PARAM_IMM_DATA_EN:
1820 sscanf(buf, "%d", &session->imm_data_en);
1821 break;
1822 case ISCSI_PARAM_FIRST_BURST:
1823 sscanf(buf, "%d", &session->first_burst);
1824 break;
1825 case ISCSI_PARAM_MAX_BURST:
1826 sscanf(buf, "%d", &session->max_burst);
1827 break;
1828 case ISCSI_PARAM_PDU_INORDER_EN:
1829 sscanf(buf, "%d", &session->pdu_inorder_en);
1830 break;
1831 case ISCSI_PARAM_DATASEQ_INORDER_EN:
1832 sscanf(buf, "%d", &session->dataseq_inorder_en);
1833 break;
1834 case ISCSI_PARAM_ERL:
1835 sscanf(buf, "%d", &session->erl);
1836 break;
1837 case ISCSI_PARAM_IFMARKER_EN:
1838 sscanf(buf, "%d", &value);
1839 BUG_ON(value);
1840 break;
1841 case ISCSI_PARAM_OFMARKER_EN:
1842 sscanf(buf, "%d", &value);
1843 BUG_ON(value);
1844 break;
1845 case ISCSI_PARAM_EXP_STATSN:
1846 sscanf(buf, "%u", &conn->exp_statsn);
1847 break;
1848 case ISCSI_PARAM_TARGET_NAME:
1849 /* this should not change between logins */
1850 if (session->targetname)
1851 break;
1852
1853 session->targetname = kstrdup(buf, GFP_KERNEL);
1854 if (!session->targetname)
1855 return -ENOMEM;
1856 break;
1857 case ISCSI_PARAM_TPGT:
1858 sscanf(buf, "%d", &session->tpgt);
1859 break;
1860 case ISCSI_PARAM_PERSISTENT_PORT:
1861 sscanf(buf, "%d", &conn->persistent_port);
1862 break;
1863 case ISCSI_PARAM_PERSISTENT_ADDRESS:
1864 /*
1865 * this is the address returned in discovery so it should
1866 * not change between logins.
1867 */
1868 if (conn->persistent_address)
1869 break;
1870
1871 conn->persistent_address = kstrdup(buf, GFP_KERNEL);
1872 if (!conn->persistent_address)
1873 return -ENOMEM;
1874 break;
1875 default:
1876 return -ENOSYS;
1877 }
1878
1879 return 0;
1880}
1881EXPORT_SYMBOL_GPL(iscsi_set_param);
1882
1883int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
1884 enum iscsi_param param, char *buf)
1885{
1886 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
1887 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
1888 int len;
1889
1890 switch(param) {
1891 case ISCSI_PARAM_INITIAL_R2T_EN:
1892 len = sprintf(buf, "%d\n", session->initial_r2t_en);
1893 break;
1894 case ISCSI_PARAM_MAX_R2T:
1895 len = sprintf(buf, "%hu\n", session->max_r2t);
1896 break;
1897 case ISCSI_PARAM_IMM_DATA_EN:
1898 len = sprintf(buf, "%d\n", session->imm_data_en);
1899 break;
1900 case ISCSI_PARAM_FIRST_BURST:
1901 len = sprintf(buf, "%u\n", session->first_burst);
1902 break;
1903 case ISCSI_PARAM_MAX_BURST:
1904 len = sprintf(buf, "%u\n", session->max_burst);
1905 break;
1906 case ISCSI_PARAM_PDU_INORDER_EN:
1907 len = sprintf(buf, "%d\n", session->pdu_inorder_en);
1908 break;
1909 case ISCSI_PARAM_DATASEQ_INORDER_EN:
1910 len = sprintf(buf, "%d\n", session->dataseq_inorder_en);
1911 break;
1912 case ISCSI_PARAM_ERL:
1913 len = sprintf(buf, "%d\n", session->erl);
1914 break;
1915 case ISCSI_PARAM_TARGET_NAME:
1916 len = sprintf(buf, "%s\n", session->targetname);
1917 break;
1918 case ISCSI_PARAM_TPGT:
1919 len = sprintf(buf, "%d\n", session->tpgt);
1920 break;
1921 default:
1922 return -ENOSYS;
1923 }
1924
1925 return len;
1926}
1927EXPORT_SYMBOL_GPL(iscsi_session_get_param);
1928
1929int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
1930 enum iscsi_param param, char *buf)
1931{
1932 struct iscsi_conn *conn = cls_conn->dd_data;
1933 int len;
1934
1935 switch(param) {
1936 case ISCSI_PARAM_MAX_RECV_DLENGTH:
1937 len = sprintf(buf, "%u\n", conn->max_recv_dlength);
1938 break;
1939 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
1940 len = sprintf(buf, "%u\n", conn->max_xmit_dlength);
1941 break;
1942 case ISCSI_PARAM_HDRDGST_EN:
1943 len = sprintf(buf, "%d\n", conn->hdrdgst_en);
1944 break;
1945 case ISCSI_PARAM_DATADGST_EN:
1946 len = sprintf(buf, "%d\n", conn->datadgst_en);
1947 break;
1948 case ISCSI_PARAM_IFMARKER_EN:
1949 len = sprintf(buf, "%d\n", conn->ifmarker_en);
1950 break;
1951 case ISCSI_PARAM_OFMARKER_EN:
1952 len = sprintf(buf, "%d\n", conn->ofmarker_en);
1953 break;
1954 case ISCSI_PARAM_EXP_STATSN:
1955 len = sprintf(buf, "%u\n", conn->exp_statsn);
1956 break;
1957 case ISCSI_PARAM_PERSISTENT_PORT:
1958 len = sprintf(buf, "%d\n", conn->persistent_port);
1959 break;
1960 case ISCSI_PARAM_PERSISTENT_ADDRESS:
1961 len = sprintf(buf, "%s\n", conn->persistent_address);
1962 break;
1963 default:
1964 return -ENOSYS;
1965 }
1966
1967 return len;
1968}
1969EXPORT_SYMBOL_GPL(iscsi_conn_get_param);
1970
7996a778
MC		 1971MODULE_AUTHOR("Mike Christie");
1972MODULE_DESCRIPTION("iSCSI library functions");
1973MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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