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[SCSI] qla4xxx: add async scan support
[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>
7996a778
MC		 25#include <linux/kfifo.h>
26#include <linux/delay.h>
11836572 27#include <linux/log2.h>
8eb00539 28#include <asm/unaligned.h>
7996a778
MC		 29#include <net/tcp.h>
30#include <scsi/scsi_cmnd.h>
31#include <scsi/scsi_device.h>
32#include <scsi/scsi_eh.h>
33#include <scsi/scsi_tcq.h>
34#include <scsi/scsi_host.h>
35#include <scsi/scsi.h>
36#include <scsi/iscsi_proto.h>
37#include <scsi/scsi_transport.h>
38#include <scsi/scsi_transport_iscsi.h>
39#include <scsi/libiscsi.h>
40
41struct iscsi_session *
42class_to_transport_session(struct iscsi_cls_session *cls_session)
43{
44 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
45 return iscsi_hostdata(shost->hostdata);
46}
47EXPORT_SYMBOL_GPL(class_to_transport_session);
48
77a23c21
MC		 49/* Serial Number Arithmetic, 32 bits, less than, RFC1982 */
50#define SNA32_CHECK 2147483648UL
7996a778 51
77a23c21
MC		 52static int iscsi_sna_lt(u32 n1, u32 n2)
53{
54 return n1 != n2 && ((n1 < n2 && (n2 - n1 < SNA32_CHECK)) ||
55 (n1 > n2 && (n2 - n1 < SNA32_CHECK)));
56}
57
58/* Serial Number Arithmetic, 32 bits, less than, RFC1982 */
59static int iscsi_sna_lte(u32 n1, u32 n2)
60{
61 return n1 == n2 || ((n1 < n2 && (n2 - n1 < SNA32_CHECK)) ||
62 (n1 > n2 && (n2 - n1 < SNA32_CHECK)));
63}
64
65void
66iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr)
7996a778
MC		 67{
68 uint32_t max_cmdsn = be32_to_cpu(hdr->max_cmdsn);
69 uint32_t exp_cmdsn = be32_to_cpu(hdr->exp_cmdsn);
70
77a23c21
MC		 71 /*
72 * standard specifies this check for when to update expected and
73 * max sequence numbers
74 */
75 if (iscsi_sna_lt(max_cmdsn, exp_cmdsn - 1))
76 return;
77
78 if (exp_cmdsn != session->exp_cmdsn &&
79 !iscsi_sna_lt(exp_cmdsn, session->exp_cmdsn))
7996a778
MC		 80 session->exp_cmdsn = exp_cmdsn;
81
77a23c21
MC		 82 if (max_cmdsn != session->max_cmdsn &&
83 !iscsi_sna_lt(max_cmdsn, session->max_cmdsn)) {
84 session->max_cmdsn = max_cmdsn;
85 /*
86 * if the window closed with IO queued, then kick the
87 * xmit thread
88 */
89 if (!list_empty(&session->leadconn->xmitqueue) ||
843c0a8a 90 !list_empty(&session->leadconn->mgmtqueue))
77a23c21
MC		 91 scsi_queue_work(session->host,
92 &session->leadconn->xmitwork);
93 }
7996a778 94}
77a23c21 95EXPORT_SYMBOL_GPL(iscsi_update_cmdsn);
7996a778
MC		 96
97void iscsi_prep_unsolicit_data_pdu(struct iscsi_cmd_task *ctask,
ffd0436e 98 struct iscsi_data *hdr)
7996a778
MC		 99{
100 struct iscsi_conn *conn = ctask->conn;
101
102 memset(hdr, 0, sizeof(struct iscsi_data));
103 hdr->ttt = cpu_to_be32(ISCSI_RESERVED_TAG);
104 hdr->datasn = cpu_to_be32(ctask->unsol_datasn);
105 ctask->unsol_datasn++;
106 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
107 memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
108
109 hdr->itt = ctask->hdr->itt;
110 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
ffd0436e 111 hdr->offset = cpu_to_be32(ctask->unsol_offset);
7996a778
MC		 112
113 if (ctask->unsol_count > conn->max_xmit_dlength) {
114 hton24(hdr->dlength, conn->max_xmit_dlength);
115 ctask->data_count = conn->max_xmit_dlength;
ffd0436e 116 ctask->unsol_offset += ctask->data_count;
7996a778
MC		 117 hdr->flags = 0;
118 } else {
119 hton24(hdr->dlength, ctask->unsol_count);
120 ctask->data_count = ctask->unsol_count;
121 hdr->flags = ISCSI_FLAG_CMD_FINAL;
122 }
123}
124EXPORT_SYMBOL_GPL(iscsi_prep_unsolicit_data_pdu);
125
004d6530
BH		 126static int iscsi_add_hdr(struct iscsi_cmd_task *ctask, unsigned len)
127{
128 unsigned exp_len = ctask->hdr_len + len;
129
130 if (exp_len > ctask->hdr_max) {
131 WARN_ON(1);
132 return -EINVAL;
133 }
134
135 WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */
136 ctask->hdr_len = exp_len;
137 return 0;
138}
139
7996a778
MC		 140/**
141 * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
142 * @ctask: iscsi cmd task
143 *
144 * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set
145 * fields like dlength or final based on how much data it sends
146 */
004d6530 147static int iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask)
7996a778
MC		 148{
149 struct iscsi_conn *conn = ctask->conn;
150 struct iscsi_session *session = conn->session;
151 struct iscsi_cmd *hdr = ctask->hdr;
152 struct scsi_cmnd *sc = ctask->sc;
004d6530
BH		 153 unsigned hdrlength;
154 int rc;
7996a778 155
004d6530
BH		 156 ctask->hdr_len = 0;
157 rc = iscsi_add_hdr(ctask, sizeof(*hdr));
158 if (rc)
159 return rc;
a8ac6311
OK		 160 hdr->opcode = ISCSI_OP_SCSI_CMD;
161 hdr->flags = ISCSI_ATTR_SIMPLE;
162 int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun);
163 hdr->itt = build_itt(ctask->itt, conn->id, session->age);
164 hdr->data_length = cpu_to_be32(scsi_bufflen(sc));
165 hdr->cmdsn = cpu_to_be32(session->cmdsn);
166 session->cmdsn++;
167 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
168 memcpy(hdr->cdb, sc->cmnd, sc->cmd_len);
d473cc7f
MC		 169 if (sc->cmd_len < MAX_COMMAND_SIZE)
170 memset(&hdr->cdb[sc->cmd_len], 0,
171 MAX_COMMAND_SIZE - sc->cmd_len);
7996a778 172
218432c6 173 ctask->imm_count = 0;
7996a778
MC		 174 if (sc->sc_data_direction == DMA_TO_DEVICE) {
175 hdr->flags |= ISCSI_FLAG_CMD_WRITE;
176 /*
177 * Write counters:
178 *
179 * imm_count bytes to be sent right after
180 * SCSI PDU Header
181 *
182 * unsol_count bytes(as Data-Out) to be sent
183 * without R2T ack right after
184 * immediate data
185 *
186 * r2t_data_count bytes to be sent via R2T ack's
187 *
188 * pad_count bytes to be sent as zero-padding
189 */
7996a778 190 ctask->unsol_count = 0;
ffd0436e 191 ctask->unsol_offset = 0;
7996a778
MC		 192 ctask->unsol_datasn = 0;
193
194 if (session->imm_data_en) {
1c138991 195 if (scsi_bufflen(sc) >= session->first_burst)
7996a778
MC		 196 ctask->imm_count = min(session->first_burst,
197 conn->max_xmit_dlength);
198 else
1c138991 199 ctask->imm_count = min(scsi_bufflen(sc),
7996a778 200 conn->max_xmit_dlength);
a8ac6311 201 hton24(hdr->dlength, ctask->imm_count);
7996a778 202 } else
a8ac6311 203 zero_data(hdr->dlength);
7996a778 204
ffd0436e 205 if (!session->initial_r2t_en) {
857ae0bd 206 ctask->unsol_count = min((session->first_burst),
1c138991 207 (scsi_bufflen(sc))) - ctask->imm_count;
ffd0436e
MC		 208 ctask->unsol_offset = ctask->imm_count;
209 }
210
7996a778
MC		 211 if (!ctask->unsol_count)
212 /* No unsolicit Data-Out's */
a8ac6311 213 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
7996a778 214 } else {
7996a778
MC		 215 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
216 zero_data(hdr->dlength);
217
218 if (sc->sc_data_direction == DMA_FROM_DEVICE)
219 hdr->flags |= ISCSI_FLAG_CMD_READ;
220 }
221
004d6530
BH		 222 /* calculate size of additional header segments (AHSs) */
223 hdrlength = ctask->hdr_len - sizeof(*hdr);
224
225 WARN_ON(hdrlength & (ISCSI_PAD_LEN-1));
226 hdrlength /= ISCSI_PAD_LEN;
227
228 WARN_ON(hdrlength >= 256);
229 hdr->hlength = hdrlength & 0xFF;
230
a8ac6311
OK		 231 if (conn->session->tt->init_cmd_task(conn->ctask))
232 return EIO;
77a23c21 233
a8ac6311
OK		 234 conn->scsicmd_pdus_cnt++;
235 debug_scsi("iscsi prep [%s cid %d sc %p cdb 0x%x itt 0x%x len %d "
77a23c21 236 "cmdsn %d win %d]\n",
a8ac6311 237 sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read",
1c138991 238 conn->id, sc, sc->cmnd[0], ctask->itt, scsi_bufflen(sc),
a8ac6311 239 session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1);
004d6530 240 return 0;
7996a778 241}
7996a778
MC		 242
243/**
244 * iscsi_complete_command - return command back to scsi-ml
7996a778
MC		 245 * @ctask: iscsi cmd task
246 *
247 * Must be called with session lock.
248 * This function returns the scsi command to scsi-ml and returns
249 * the cmd task to the pool of available cmd tasks.
250 */
60ecebf5 251static void iscsi_complete_command(struct iscsi_cmd_task *ctask)
7996a778 252{
c1635cb7
MC		 253 struct iscsi_conn *conn = ctask->conn;
254 struct iscsi_session *session = conn->session;
7996a778
MC		 255 struct scsi_cmnd *sc = ctask->sc;
256
b6c395ed 257 ctask->state = ISCSI_TASK_COMPLETED;
7996a778 258 ctask->sc = NULL;
f47f2cf5
MC		 259 /* SCSI eh reuses commands to verify us */
260 sc->SCp.ptr = NULL;
c1635cb7
MC		 261 if (conn->ctask == ctask)
262 conn->ctask = NULL;
7996a778
MC		 263 list_del_init(&ctask->running);
264 __kfifo_put(session->cmdpool.queue, (void*)&ctask, sizeof(void*));
265 sc->scsi_done(sc);
266}
267
60ecebf5
MC		 268static void __iscsi_get_ctask(struct iscsi_cmd_task *ctask)
269{
270 atomic_inc(&ctask->refcount);
271}
272
60ecebf5
MC		 273static void __iscsi_put_ctask(struct iscsi_cmd_task *ctask)
274{
e648f63c 275 if (atomic_dec_and_test(&ctask->refcount))
60ecebf5 276 iscsi_complete_command(ctask);
60ecebf5
MC		 277}
278
b3a7ea8d
MC		 279/*
280 * session lock must be held
281 */
282static void fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
283 int err)
284{
285 struct scsi_cmnd *sc;
286
287 sc = ctask->sc;
288 if (!sc)
289 return;
290
291 if (ctask->state == ISCSI_TASK_PENDING)
292 /*
293 * cmd never made it to the xmit thread, so we should not count
294 * the cmd in the sequencing
295 */
296 conn->session->queued_cmdsn--;
297 else
298 conn->session->tt->cleanup_cmd_task(conn, ctask);
299
300 sc->result = err;
301 scsi_set_resid(sc, scsi_bufflen(sc));
302 if (conn->ctask == ctask)
303 conn->ctask = NULL;
304 /* release ref from queuecommand */
305 __iscsi_put_ctask(ctask);
306}
307
308/**
309 * iscsi_free_mgmt_task - return mgmt task back to pool
310 * @conn: iscsi connection
311 * @mtask: mtask
312 *
313 * Must be called with session lock.
314 */
315void iscsi_free_mgmt_task(struct iscsi_conn *conn,
316 struct iscsi_mgmt_task *mtask)
317{
318 list_del_init(&mtask->running);
319 if (conn->login_mtask == mtask)
320 return;
f6d5180c
MC		 321
322 if (conn->ping_mtask == mtask)
323 conn->ping_mtask = NULL;
b3a7ea8d
MC		 324 __kfifo_put(conn->session->mgmtpool.queue,
325 (void*)&mtask, sizeof(void*));
326}
327EXPORT_SYMBOL_GPL(iscsi_free_mgmt_task);
328
f6d5180c
MC		 329static struct iscsi_mgmt_task *
330__iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
331 char *data, uint32_t data_size)
332{
333 struct iscsi_session *session = conn->session;
334 struct iscsi_mgmt_task *mtask;
335
336 if (session->state == ISCSI_STATE_TERMINATE)
337 return NULL;
338
339 if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) ||
340 hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
341 /*
342 * Login and Text are sent serially, in
343 * request-followed-by-response sequence.
344 * Same mtask can be used. Same ITT must be used.
345 * Note that login_mtask is preallocated at conn_create().
346 */
347 mtask = conn->login_mtask;
348 else {
349 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
350 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
351
352 if (!__kfifo_get(session->mgmtpool.queue,
353 (void*)&mtask, sizeof(void*)))
354 return NULL;
355 }
356
357 if (data_size) {
358 memcpy(mtask->data, data, data_size);
359 mtask->data_count = data_size;
360 } else
361 mtask->data_count = 0;
362
363 memcpy(mtask->hdr, hdr, sizeof(struct iscsi_hdr));
364 INIT_LIST_HEAD(&mtask->running);
365 list_add_tail(&mtask->running, &conn->mgmtqueue);
366 return mtask;
367}
368
369int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr,
370 char *data, uint32_t data_size)
371{
372 struct iscsi_conn *conn = cls_conn->dd_data;
373 struct iscsi_session *session = conn->session;
374 int err = 0;
375
376 spin_lock_bh(&session->lock);
377 if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size))
378 err = -EPERM;
379 spin_unlock_bh(&session->lock);
380 scsi_queue_work(session->host, &conn->xmitwork);
381 return err;
382}
383EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu);
384
7996a778
MC		 385/**
386 * iscsi_cmd_rsp - SCSI Command Response processing
387 * @conn: iscsi connection
388 * @hdr: iscsi header
389 * @ctask: scsi command task
390 * @data: cmd data buffer
391 * @datalen: len of buffer
392 *
393 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and
394 * then completes the command and task.
395 **/
77a23c21
MC		 396static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
397 struct iscsi_cmd_task *ctask, char *data,
398 int datalen)
7996a778 399{
7996a778
MC		 400 struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)hdr;
401 struct iscsi_session *session = conn->session;
402 struct scsi_cmnd *sc = ctask->sc;
403
77a23c21 404 iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr);
7996a778
MC		 405 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
406
407 sc->result = (DID_OK << 16) | rhdr->cmd_status;
408
409 if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) {
410 sc->result = DID_ERROR << 16;
411 goto out;
412 }
413
414 if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) {
9b80cb4b 415 uint16_t senselen;
7996a778
MC		 416
417 if (datalen < 2) {
418invalid_datalen:
be2df72e
OG		 419 printk(KERN_ERR "iscsi: Got CHECK_CONDITION but "
420 "invalid data buffer size of %d\n", datalen);
7996a778
MC		 421 sc->result = DID_BAD_TARGET << 16;
422 goto out;
423 }
424
8eb00539 425 senselen = be16_to_cpu(get_unaligned((__be16 *) data));
7996a778
MC		 426 if (datalen < senselen)
427 goto invalid_datalen;
428
429 memcpy(sc->sense_buffer, data + 2,
9b80cb4b 430 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
7996a778 431 debug_scsi("copied %d bytes of sense\n",
8eb00539 432 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
7996a778
MC		 433 }
434
7207fea4
BH		 435 if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW |
436 ISCSI_FLAG_CMD_OVERFLOW)) {
7996a778
MC		 437 int res_count = be32_to_cpu(rhdr->residual_count);
438
7207fea4
BH		 439 if (res_count > 0 &&
440 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
441 res_count <= scsi_bufflen(sc)))
1c138991 442 scsi_set_resid(sc, res_count);
7996a778
MC		 443 else
444 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
7207fea4
BH		 445 } else if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW |
446 ISCSI_FLAG_CMD_BIDI_OVERFLOW))
7996a778 447 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
7996a778
MC		 448
449out:
450 debug_scsi("done [sc %lx res %d itt 0x%x]\n",
451 (long)sc, sc->result, ctask->itt);
452 conn->scsirsp_pdus_cnt++;
453
60ecebf5 454 __iscsi_put_ctask(ctask);
7996a778
MC		 455}
456
7ea8b828
MC		 457static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
458{
459 struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr;
460
461 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
462 conn->tmfrsp_pdus_cnt++;
463
843c0a8a 464 if (conn->tmf_state != TMF_QUEUED)
7ea8b828
MC		 465 return;
466
467 if (tmf->response == ISCSI_TMF_RSP_COMPLETE)
843c0a8a 468 conn->tmf_state = TMF_SUCCESS;
7ea8b828 469 else if (tmf->response == ISCSI_TMF_RSP_NO_TASK)
843c0a8a 470 conn->tmf_state = TMF_NOT_FOUND;
7ea8b828 471 else
843c0a8a 472 conn->tmf_state = TMF_FAILED;
7ea8b828
MC		 473 wake_up(&conn->ehwait);
474}
475
f6d5180c
MC		 476static void iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr)
477{
478 struct iscsi_nopout hdr;
479 struct iscsi_mgmt_task *mtask;
480
481 if (!rhdr && conn->ping_mtask)
482 return;
483
484 memset(&hdr, 0, sizeof(struct iscsi_nopout));
485 hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE;
486 hdr.flags = ISCSI_FLAG_CMD_FINAL;
487
488 if (rhdr) {
489 memcpy(hdr.lun, rhdr->lun, 8);
490 hdr.ttt = rhdr->ttt;
491 hdr.itt = RESERVED_ITT;
492 } else
493 hdr.ttt = RESERVED_ITT;
494
495 mtask = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0);
496 if (!mtask) {
497 printk(KERN_ERR "Could not send nopout\n");
498 return;
499 }
500
501 /* only track our nops */
502 if (!rhdr) {
503 conn->ping_mtask = mtask;
504 conn->last_ping = jiffies;
505 }
506 scsi_queue_work(conn->session->host, &conn->xmitwork);
507}
508
62f38300
MC		 509static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
510 char *data, int datalen)
511{
512 struct iscsi_reject *reject = (struct iscsi_reject *)hdr;
513 struct iscsi_hdr rejected_pdu;
514 uint32_t itt;
515
516 conn->exp_statsn = be32_to_cpu(reject->statsn) + 1;
517
518 if (reject->reason == ISCSI_REASON_DATA_DIGEST_ERROR) {
519 if (ntoh24(reject->dlength) > datalen)
520 return ISCSI_ERR_PROTO;
521
522 if (ntoh24(reject->dlength) >= sizeof(struct iscsi_hdr)) {
523 memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr));
b4377356 524 itt = get_itt(rejected_pdu.itt);
62f38300
MC		 525 printk(KERN_ERR "itt 0x%x had pdu (op 0x%x) rejected "
526 "due to DataDigest error.\n", itt,
527 rejected_pdu.opcode);
528 }
529 }
530 return 0;
531}
532
7996a778
MC		 533/**
534 * __iscsi_complete_pdu - complete pdu
535 * @conn: iscsi conn
536 * @hdr: iscsi header
537 * @data: data buffer
538 * @datalen: len of data buffer
539 *
540 * Completes pdu processing by freeing any resources allocated at
541 * queuecommand or send generic. session lock must be held and verify
542 * itt must have been called.
543 */
f8d9d654
AB		 544static int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
545 char *data, int datalen)
7996a778
MC		 546{
547 struct iscsi_session *session = conn->session;
548 int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0;
549 struct iscsi_cmd_task *ctask;
550 struct iscsi_mgmt_task *mtask;
551 uint32_t itt;
552
f6d5180c 553 conn->last_recv = jiffies;
b4377356
AV		 554 if (hdr->itt != RESERVED_ITT)
555 itt = get_itt(hdr->itt);
7996a778 556 else
b4377356 557 itt = ~0U;
7996a778
MC		 558
559 if (itt < session->cmds_max) {
560 ctask = session->cmds[itt];
561
562 debug_scsi("cmdrsp [op 0x%x cid %d itt 0x%x len %d]\n",
563 opcode, conn->id, ctask->itt, datalen);
564
565 switch(opcode) {
566 case ISCSI_OP_SCSI_CMD_RSP:
567 BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
77a23c21
MC		 568 iscsi_scsi_cmd_rsp(conn, hdr, ctask, data,
569 datalen);
7996a778
MC		 570 break;
571 case ISCSI_OP_SCSI_DATA_IN:
572 BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
573 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
574 conn->scsirsp_pdus_cnt++;
60ecebf5 575 __iscsi_put_ctask(ctask);
7996a778
MC		 576 }
577 break;
578 case ISCSI_OP_R2T:
579 /* LLD handles this for now */
580 break;
581 default:
582 rc = ISCSI_ERR_BAD_OPCODE;
583 break;
584 }
585 } else if (itt >= ISCSI_MGMT_ITT_OFFSET &&
586 itt < ISCSI_MGMT_ITT_OFFSET + session->mgmtpool_max) {
587 mtask = session->mgmt_cmds[itt - ISCSI_MGMT_ITT_OFFSET];
588
589 debug_scsi("immrsp [op 0x%x cid %d itt 0x%x len %d]\n",
590 opcode, conn->id, mtask->itt, datalen);
591
77a23c21 592 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
7996a778 593 switch(opcode) {
8d2860b3 594 case ISCSI_OP_LOGOUT_RSP:
c8dc1e52
MC		 595 if (datalen) {
596 rc = ISCSI_ERR_PROTO;
597 break;
598 }
8d2860b3
MC		 599 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
600 /* fall through */
7996a778
MC		 601 case ISCSI_OP_LOGIN_RSP:
602 case ISCSI_OP_TEXT_RSP:
8d2860b3
MC		 603 /*
604 * login related PDU's exp_statsn is handled in
605 * userspace
606 */
40527afe
MC		 607 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
608 rc = ISCSI_ERR_CONN_FAILED;
b3a7ea8d 609 iscsi_free_mgmt_task(conn, mtask);
7996a778
MC		 610 break;
611 case ISCSI_OP_SCSI_TMFUNC_RSP:
7996a778
MC		 612 if (datalen) {
613 rc = ISCSI_ERR_PROTO;
614 break;
615 }
8d2860b3 616
7ea8b828 617 iscsi_tmf_rsp(conn, hdr);
b3a7ea8d 618 iscsi_free_mgmt_task(conn, mtask);
7996a778
MC		 619 break;
620 case ISCSI_OP_NOOP_IN:
f6d5180c
MC		 621 if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) ||
622 datalen) {
7996a778
MC		 623 rc = ISCSI_ERR_PROTO;
624 break;
625 }
7996a778
MC		 626 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
627
f6d5180c
MC		 628 if (conn->ping_mtask != mtask) {
629 /*
630 * If this is not in response to one of our
631 * nops then it must be from userspace.
632 */
633 if (iscsi_recv_pdu(conn->cls_conn, hdr, data,
634 datalen))
635 rc = ISCSI_ERR_CONN_FAILED;
636 }
b3a7ea8d 637 iscsi_free_mgmt_task(conn, mtask);
7996a778
MC		 638 break;
639 default:
640 rc = ISCSI_ERR_BAD_OPCODE;
641 break;
642 }
b4377356 643 } else if (itt == ~0U) {
77a23c21 644 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
62f38300 645
7996a778
MC		 646 switch(opcode) {
647 case ISCSI_OP_NOOP_IN:
40527afe 648 if (datalen) {
7996a778 649 rc = ISCSI_ERR_PROTO;
40527afe
MC		 650 break;
651 }
652
b4377356 653 if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG))
40527afe
MC		 654 break;
655
f6d5180c 656 iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr);
7996a778
MC		 657 break;
658 case ISCSI_OP_REJECT:
62f38300
MC		 659 rc = iscsi_handle_reject(conn, hdr, data, datalen);
660 break;
7996a778 661 case ISCSI_OP_ASYNC_EVENT:
8d2860b3 662 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
5831c737
MC		 663 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
664 rc = ISCSI_ERR_CONN_FAILED;
7996a778
MC		 665 break;
666 default:
667 rc = ISCSI_ERR_BAD_OPCODE;
668 break;
669 }
670 } else
671 rc = ISCSI_ERR_BAD_ITT;
672
673 return rc;
674}
7996a778
MC		 675
676int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
677 char *data, int datalen)
678{
679 int rc;
680
681 spin_lock(&conn->session->lock);
682 rc = __iscsi_complete_pdu(conn, hdr, data, datalen);
683 spin_unlock(&conn->session->lock);
684 return rc;
685}
686EXPORT_SYMBOL_GPL(iscsi_complete_pdu);
687
688/* verify itt (itt encoding: age+cid+itt) */
689int iscsi_verify_itt(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
690 uint32_t *ret_itt)
691{
692 struct iscsi_session *session = conn->session;
693 struct iscsi_cmd_task *ctask;
694 uint32_t itt;
695
b4377356
AV		 696 if (hdr->itt != RESERVED_ITT) {
697 if (((__force u32)hdr->itt & ISCSI_AGE_MASK) !=
7996a778 698 (session->age << ISCSI_AGE_SHIFT)) {
be2df72e 699 printk(KERN_ERR "iscsi: received itt %x expected "
b4377356 700 "session age (%x)\n", (__force u32)hdr->itt,
7996a778
MC		 701 session->age & ISCSI_AGE_MASK);
702 return ISCSI_ERR_BAD_ITT;
703 }
704
b4377356 705 if (((__force u32)hdr->itt & ISCSI_CID_MASK) !=
7996a778 706 (conn->id << ISCSI_CID_SHIFT)) {
be2df72e 707 printk(KERN_ERR "iscsi: received itt %x, expected "
b4377356 708 "CID (%x)\n", (__force u32)hdr->itt, conn->id);
7996a778
MC		 709 return ISCSI_ERR_BAD_ITT;
710 }
b4377356 711 itt = get_itt(hdr->itt);
7996a778 712 } else
b4377356 713 itt = ~0U;
7996a778
MC		 714
715 if (itt < session->cmds_max) {
716 ctask = session->cmds[itt];
717
718 if (!ctask->sc) {
be2df72e 719 printk(KERN_INFO "iscsi: dropping ctask with "
7996a778
MC		 720 "itt 0x%x\n", ctask->itt);
721 /* force drop */
722 return ISCSI_ERR_NO_SCSI_CMD;
723 }
724
725 if (ctask->sc->SCp.phase != session->age) {
be2df72e 726 printk(KERN_ERR "iscsi: ctask's session age %d, "
7996a778
MC		 727 "expected %d\n", ctask->sc->SCp.phase,
728 session->age);
729 return ISCSI_ERR_SESSION_FAILED;
730 }
731 }
732
733 *ret_itt = itt;
734 return 0;
735}
736EXPORT_SYMBOL_GPL(iscsi_verify_itt);
737
738void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
739{
740 struct iscsi_session *session = conn->session;
741 unsigned long flags;
742
743 spin_lock_irqsave(&session->lock, flags);
656cffc9
MC		 744 if (session->state == ISCSI_STATE_FAILED) {
745 spin_unlock_irqrestore(&session->lock, flags);
746 return;
747 }
748
67a61114 749 if (conn->stop_stage == 0)
7996a778
MC		 750 session->state = ISCSI_STATE_FAILED;
751 spin_unlock_irqrestore(&session->lock, flags);
752 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
753 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
754 iscsi_conn_error(conn->cls_conn, err);
755}
756EXPORT_SYMBOL_GPL(iscsi_conn_failure);
757
77a23c21
MC		 758static void iscsi_prep_mtask(struct iscsi_conn *conn,
759 struct iscsi_mgmt_task *mtask)
760{
761 struct iscsi_session *session = conn->session;
762 struct iscsi_hdr *hdr = mtask->hdr;
763 struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
764
765 if (hdr->opcode != (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) &&
766 hdr->opcode != (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
767 nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
768 /*
769 * pre-format CmdSN for outgoing PDU.
770 */
771 nop->cmdsn = cpu_to_be32(session->cmdsn);
772 if (hdr->itt != RESERVED_ITT) {
773 hdr->itt = build_itt(mtask->itt, conn->id, session->age);
e0726407
MC		 774 /*
775 * TODO: We always use immediate, so we never hit this.
776 * If we start to send tmfs or nops as non-immediate then
777 * we should start checking the cmdsn numbers for mgmt tasks.
778 */
77a23c21 779 if (conn->c_stage == ISCSI_CONN_STARTED &&
e0726407
MC		 780 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
781 session->queued_cmdsn++;
77a23c21 782 session->cmdsn++;
e0726407 783 }
77a23c21
MC		 784 }
785
786 if (session->tt->init_mgmt_task)
787 session->tt->init_mgmt_task(conn, mtask);
788
789 debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n",
843c0a8a
MC		 790 hdr->opcode & ISCSI_OPCODE_MASK, hdr->itt,
791 mtask->data_count);
77a23c21
MC		 792}
793
05db888a 794static int iscsi_xmit_mtask(struct iscsi_conn *conn)
b5072ea0
MC		 795{
796 struct iscsi_hdr *hdr = conn->mtask->hdr;
b3a7ea8d 797 int rc;
b5072ea0 798
b3a7ea8d
MC		 799 if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT)
800 conn->session->state = ISCSI_STATE_LOGGING_OUT;
77a23c21 801 spin_unlock_bh(&conn->session->lock);
b3a7ea8d 802
b5072ea0 803 rc = conn->session->tt->xmit_mgmt_task(conn, conn->mtask);
77a23c21 804 spin_lock_bh(&conn->session->lock);
b5072ea0
MC		 805 if (rc)
806 return rc;
807
05db888a
MC		 808 /* done with this in-progress mtask */
809 conn->mtask = NULL;
b5072ea0
MC		 810 return 0;
811}
812
77a23c21
MC		 813static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn)
814{
815 struct iscsi_session *session = conn->session;
816
817 /*
818 * Check for iSCSI window and take care of CmdSN wrap-around
819 */
e0726407
MC		 820 if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) {
821 debug_scsi("iSCSI CmdSN closed. ExpCmdSn %u MaxCmdSN %u "
822 "CmdSN %u/%u\n", session->exp_cmdsn,
823 session->max_cmdsn, session->cmdsn,
824 session->queued_cmdsn);
77a23c21
MC		 825 return -ENOSPC;
826 }
827 return 0;
828}
829
830static int iscsi_xmit_ctask(struct iscsi_conn *conn)
831{
832 struct iscsi_cmd_task *ctask = conn->ctask;
843c0a8a 833 int rc;
77a23c21
MC		 834
835 __iscsi_get_ctask(ctask);
836 spin_unlock_bh(&conn->session->lock);
837 rc = conn->session->tt->xmit_cmd_task(conn, ctask);
838 spin_lock_bh(&conn->session->lock);
839 __iscsi_put_ctask(ctask);
77a23c21
MC		 840 if (!rc)
841 /* done with this ctask */
842 conn->ctask = NULL;
843 return rc;
844}
845
843c0a8a
MC		 846/**
847 * iscsi_requeue_ctask - requeue ctask to run from session workqueue
848 * @ctask: ctask to requeue
849 *
850 * LLDs that need to run a ctask from the session workqueue should call
851 * this. The session lock must be held.
852 */
853void iscsi_requeue_ctask(struct iscsi_cmd_task *ctask)
854{
855 struct iscsi_conn *conn = ctask->conn;
856
857 list_move_tail(&ctask->running, &conn->requeue);
858 scsi_queue_work(conn->session->host, &conn->xmitwork);
859}
860EXPORT_SYMBOL_GPL(iscsi_requeue_ctask);
861
7996a778
MC		 862/**
863 * iscsi_data_xmit - xmit any command into the scheduled connection
864 * @conn: iscsi connection
865 *
866 * Notes:
867 * The function can return -EAGAIN in which case the caller must
868 * re-schedule it again later or recover. '0' return code means
869 * successful xmit.
870 **/
871static int iscsi_data_xmit(struct iscsi_conn *conn)
872{
3219e529 873 int rc = 0;
7996a778 874
77a23c21 875 spin_lock_bh(&conn->session->lock);
7996a778
MC		 876 if (unlikely(conn->suspend_tx)) {
877 debug_scsi("conn %d Tx suspended!\n", conn->id);
77a23c21 878 spin_unlock_bh(&conn->session->lock);
3219e529 879 return -ENODATA;
7996a778 880 }
7996a778
MC		 881
882 if (conn->ctask) {
77a23c21 883 rc = iscsi_xmit_ctask(conn);
3219e529 884 if (rc)
7996a778 885 goto again;
7996a778 886 }
77a23c21 887
7996a778 888 if (conn->mtask) {
05db888a 889 rc = iscsi_xmit_mtask(conn);
3219e529 890 if (rc)
7996a778 891 goto again;
7996a778
MC		 892 }
893
77a23c21
MC		 894 /*
895 * process mgmt pdus like nops before commands since we should
896 * only have one nop-out as a ping from us and targets should not
897 * overflow us with nop-ins
898 */
899check_mgmt:
843c0a8a
MC		 900 while (!list_empty(&conn->mgmtqueue)) {
901 conn->mtask = list_entry(conn->mgmtqueue.next,
902 struct iscsi_mgmt_task, running);
b3a7ea8d
MC		 903 if (conn->session->state == ISCSI_STATE_LOGGING_OUT) {
904 iscsi_free_mgmt_task(conn, conn->mtask);
905 conn->mtask = NULL;
906 continue;
907 }
908
77a23c21 909 iscsi_prep_mtask(conn, conn->mtask);
843c0a8a 910 list_move_tail(conn->mgmtqueue.next, &conn->mgmt_run_list);
77a23c21
MC		 911 rc = iscsi_xmit_mtask(conn);
912 if (rc)
913 goto again;
7996a778
MC		 914 }
915
843c0a8a 916 /* process pending command queue */
b6c395ed 917 while (!list_empty(&conn->xmitqueue)) {
843c0a8a
MC		 918 if (conn->tmf_state == TMF_QUEUED)
919 break;
920
b6c395ed
MC		 921 conn->ctask = list_entry(conn->xmitqueue.next,
922 struct iscsi_cmd_task, running);
b3a7ea8d 923 if (conn->session->state == ISCSI_STATE_LOGGING_OUT) {
9000bcd6 924 fail_command(conn, conn->ctask, DID_IMM_RETRY << 16);
b3a7ea8d
MC		 925 continue;
926 }
004d6530
BH		 927 if (iscsi_prep_scsi_cmd_pdu(conn->ctask)) {
928 fail_command(conn, conn->ctask, DID_ABORT << 16);
929 continue;
930 }
a8ac6311 931
843c0a8a 932 conn->ctask->state = ISCSI_TASK_RUNNING;
b6c395ed 933 list_move_tail(conn->xmitqueue.next, &conn->run_list);
77a23c21
MC		 934 rc = iscsi_xmit_ctask(conn);
935 if (rc)
60ecebf5 936 goto again;
77a23c21
MC		 937 /*
938 * we could continuously get new ctask requests so
939 * we need to check the mgmt queue for nops that need to
940 * be sent to aviod starvation
941 */
843c0a8a
MC		 942 if (!list_empty(&conn->mgmtqueue))
943 goto check_mgmt;
944 }
945
946 while (!list_empty(&conn->requeue)) {
947 if (conn->session->fast_abort && conn->tmf_state != TMF_INITIAL)
948 break;
949
b3a7ea8d
MC		 950 /*
951 * we always do fastlogout - conn stop code will clean up.
952 */
953 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
954 break;
955
843c0a8a
MC		 956 conn->ctask = list_entry(conn->requeue.next,
957 struct iscsi_cmd_task, running);
958 conn->ctask->state = ISCSI_TASK_RUNNING;
959 list_move_tail(conn->requeue.next, &conn->run_list);
960 rc = iscsi_xmit_ctask(conn);
961 if (rc)
962 goto again;
963 if (!list_empty(&conn->mgmtqueue))
77a23c21 964 goto check_mgmt;
7996a778 965 }
b6c395ed 966 spin_unlock_bh(&conn->session->lock);
3219e529 967 return -ENODATA;
7996a778
MC		 968
969again:
970 if (unlikely(conn->suspend_tx))
77a23c21
MC		 971 rc = -ENODATA;
972 spin_unlock_bh(&conn->session->lock);
3219e529 973 return rc;
7996a778
MC		 974}
975
c4028958 976static void iscsi_xmitworker(struct work_struct *work)
7996a778 977{
c4028958
DH		 978 struct iscsi_conn *conn =
979 container_of(work, struct iscsi_conn, xmitwork);
3219e529 980 int rc;
7996a778
MC		 981 /*
982 * serialize Xmit worker on a per-connection basis.
983 */
3219e529
MC		 984 do {
985 rc = iscsi_data_xmit(conn);
986 } while (rc >= 0 || rc == -EAGAIN);
7996a778
MC		 987}
988
989enum {
990 FAILURE_BAD_HOST = 1,
991 FAILURE_SESSION_FAILED,
992 FAILURE_SESSION_FREED,
993 FAILURE_WINDOW_CLOSED,
60ecebf5 994 FAILURE_OOM,
7996a778 995 FAILURE_SESSION_TERMINATE,
656cffc9 996 FAILURE_SESSION_IN_RECOVERY,
7996a778 997 FAILURE_SESSION_RECOVERY_TIMEOUT,
b3a7ea8d 998 FAILURE_SESSION_LOGGING_OUT,
6eabafbe 999 FAILURE_SESSION_NOT_READY,
7996a778
MC		 1000};
1001
1002int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
1003{
1004 struct Scsi_Host *host;
1005 int reason = 0;
1006 struct iscsi_session *session;
1007 struct iscsi_conn *conn;
1008 struct iscsi_cmd_task *ctask = NULL;
1009
1010 sc->scsi_done = done;
1011 sc->result = 0;
f47f2cf5 1012 sc->SCp.ptr = NULL;
7996a778
MC		 1013
1014 host = sc->device->host;
1040c99d 1015 spin_unlock(host->host_lock);
7996a778 1016
1040c99d 1017 session = iscsi_hostdata(host->hostdata);
7996a778
MC		 1018 spin_lock(&session->lock);
1019
6eabafbe
MC		 1020 reason = iscsi_session_chkready(session_to_cls(session));
1021 if (reason) {
1022 sc->result = reason;
1023 goto fault;
1024 }
1025
656cffc9
MC		 1026 /*
1027 * ISCSI_STATE_FAILED is a temp. state. The recovery
1028 * code will decide what is best to do with command queued
1029 * during this time
1030 */
1031 if (session->state != ISCSI_STATE_LOGGED_IN &&
1032 session->state != ISCSI_STATE_FAILED) {
1033 /*
1034 * to handle the race between when we set the recovery state
1035 * and block the session we requeue here (commands could
1036 * be entering our queuecommand while a block is starting
1037 * up because the block code is not locked)
1038 */
9000bcd6
MC		 1039 switch (session->state) {
1040 case ISCSI_STATE_IN_RECOVERY:
656cffc9 1041 reason = FAILURE_SESSION_IN_RECOVERY;
6eabafbe
MC		 1042 sc->result = DID_IMM_RETRY << 16;
1043 break;
9000bcd6
MC		 1044 case ISCSI_STATE_LOGGING_OUT:
1045 reason = FAILURE_SESSION_LOGGING_OUT;
6eabafbe
MC		 1046 sc->result = DID_IMM_RETRY << 16;
1047 break;
b3a7ea8d 1048 case ISCSI_STATE_RECOVERY_FAILED:
656cffc9 1049 reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
6eabafbe 1050 sc->result = DID_NO_CONNECT << 16;
b3a7ea8d
MC		 1051 break;
1052 case ISCSI_STATE_TERMINATE:
656cffc9 1053 reason = FAILURE_SESSION_TERMINATE;
6eabafbe 1054 sc->result = DID_NO_CONNECT << 16;
b3a7ea8d 1055 break;
b3a7ea8d 1056 default:
656cffc9 1057 reason = FAILURE_SESSION_FREED;
6eabafbe 1058 sc->result = DID_NO_CONNECT << 16;
b3a7ea8d 1059 }
7996a778
MC		 1060 goto fault;
1061 }
1062
7996a778 1063 conn = session->leadconn;
98644047
MC		 1064 if (!conn) {
1065 reason = FAILURE_SESSION_FREED;
6eabafbe 1066 sc->result = DID_NO_CONNECT << 16;
98644047
MC		 1067 goto fault;
1068 }
7996a778 1069
77a23c21
MC		 1070 if (iscsi_check_cmdsn_window_closed(conn)) {
1071 reason = FAILURE_WINDOW_CLOSED;
1072 goto reject;
1073 }
1074
60ecebf5
MC		 1075 if (!__kfifo_get(session->cmdpool.queue, (void*)&ctask,
1076 sizeof(void*))) {
1077 reason = FAILURE_OOM;
1078 goto reject;
1079 }
e0726407
MC		 1080 session->queued_cmdsn++;
1081
7996a778
MC		 1082 sc->SCp.phase = session->age;
1083 sc->SCp.ptr = (char *)ctask;
1084
60ecebf5 1085 atomic_set(&ctask->refcount, 1);
b6c395ed 1086 ctask->state = ISCSI_TASK_PENDING;
7996a778
MC		 1087 ctask->conn = conn;
1088 ctask->sc = sc;
1089 INIT_LIST_HEAD(&ctask->running);
7996a778 1090
b6c395ed 1091 list_add_tail(&ctask->running, &conn->xmitqueue);
7996a778
MC		 1092 spin_unlock(&session->lock);
1093
1094 scsi_queue_work(host, &conn->xmitwork);
1040c99d 1095 spin_lock(host->host_lock);
7996a778
MC		 1096 return 0;
1097
1098reject:
1099 spin_unlock(&session->lock);
1100 debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason);
1040c99d 1101 spin_lock(host->host_lock);
7996a778
MC		 1102 return SCSI_MLQUEUE_HOST_BUSY;
1103
1104fault:
1105 spin_unlock(&session->lock);
6eabafbe 1106 debug_scsi("iscsi: cmd 0x%x is not queued (%d)\n", sc->cmnd[0], reason);
1c138991 1107 scsi_set_resid(sc, scsi_bufflen(sc));
7996a778 1108 sc->scsi_done(sc);
1040c99d 1109 spin_lock(host->host_lock);
7996a778
MC		 1110 return 0;
1111}
1112EXPORT_SYMBOL_GPL(iscsi_queuecommand);
1113
1114int iscsi_change_queue_depth(struct scsi_device *sdev, int depth)
1115{
1116 if (depth > ISCSI_MAX_CMD_PER_LUN)
1117 depth = ISCSI_MAX_CMD_PER_LUN;
1118 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
1119 return sdev->queue_depth;
1120}
1121EXPORT_SYMBOL_GPL(iscsi_change_queue_depth);
1122
7996a778
MC		 1123void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
1124{
1125 struct iscsi_session *session = class_to_transport_session(cls_session);
7996a778
MC		 1126
1127 spin_lock_bh(&session->lock);
1128 if (session->state != ISCSI_STATE_LOGGED_IN) {
656cffc9 1129 session->state = ISCSI_STATE_RECOVERY_FAILED;
843c0a8a
MC		 1130 if (session->leadconn)
1131 wake_up(&session->leadconn->ehwait);
7996a778
MC		 1132 }
1133 spin_unlock_bh(&session->lock);
1134}
1135EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
1136
1137int iscsi_eh_host_reset(struct scsi_cmnd *sc)
1138{
1139 struct Scsi_Host *host = sc->device->host;
1140 struct iscsi_session *session = iscsi_hostdata(host->hostdata);
1141 struct iscsi_conn *conn = session->leadconn;
7996a778 1142
bc436b27 1143 mutex_lock(&session->eh_mutex);
7996a778
MC		 1144 spin_lock_bh(&session->lock);
1145 if (session->state == ISCSI_STATE_TERMINATE) {
1146failed:
1147 debug_scsi("failing host reset: session terminated "
d6e24d1c 1148 "[CID %d age %d]\n", conn->id, session->age);
7996a778 1149 spin_unlock_bh(&session->lock);
bc436b27 1150 mutex_unlock(&session->eh_mutex);
7996a778
MC		 1151 return FAILED;
1152 }
1153
7996a778 1154 spin_unlock_bh(&session->lock);
bc436b27 1155 mutex_unlock(&session->eh_mutex);
7996a778
MC		 1156 /*
1157 * we drop the lock here but the leadconn cannot be destoyed while
1158 * we are in the scsi eh
1159 */
843c0a8a 1160 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
7996a778
MC		 1161
1162 debug_scsi("iscsi_eh_host_reset wait for relogin\n");
1163 wait_event_interruptible(conn->ehwait,
1164 session->state == ISCSI_STATE_TERMINATE ||
1165 session->state == ISCSI_STATE_LOGGED_IN ||
656cffc9 1166 session->state == ISCSI_STATE_RECOVERY_FAILED);
7996a778
MC		 1167 if (signal_pending(current))
1168 flush_signals(current);
1169
bc436b27 1170 mutex_lock(&session->eh_mutex);
7996a778
MC		 1171 spin_lock_bh(&session->lock);
1172 if (session->state == ISCSI_STATE_LOGGED_IN)
be2df72e 1173 printk(KERN_INFO "iscsi: host reset succeeded\n");
7996a778
MC		 1174 else
1175 goto failed;
1176 spin_unlock_bh(&session->lock);
bc436b27 1177 mutex_unlock(&session->eh_mutex);
7996a778
MC		 1178 return SUCCESS;
1179}
1180EXPORT_SYMBOL_GPL(iscsi_eh_host_reset);
1181
843c0a8a 1182static void iscsi_tmf_timedout(unsigned long data)
7996a778 1183{
843c0a8a 1184 struct iscsi_conn *conn = (struct iscsi_conn *)data;
7996a778
MC		 1185 struct iscsi_session *session = conn->session;
1186
1187 spin_lock(&session->lock);
843c0a8a
MC		 1188 if (conn->tmf_state == TMF_QUEUED) {
1189 conn->tmf_state = TMF_TIMEDOUT;
1190 debug_scsi("tmf timedout\n");
7996a778
MC		 1191 /* unblock eh_abort() */
1192 wake_up(&conn->ehwait);
1193 }
1194 spin_unlock(&session->lock);
1195}
1196
843c0a8a 1197static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn,
f6d5180c
MC		 1198 struct iscsi_tm *hdr, int age,
1199 int timeout)
7996a778 1200{
7996a778 1201 struct iscsi_session *session = conn->session;
843c0a8a 1202 struct iscsi_mgmt_task *mtask;
7996a778 1203
843c0a8a
MC		 1204 mtask = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr,
1205 NULL, 0);
1206 if (!mtask) {
6724add1 1207 spin_unlock_bh(&session->lock);
7996a778 1208 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
843c0a8a
MC		 1209 spin_lock_bh(&session->lock);
1210 debug_scsi("tmf exec failure\n");
77a23c21 1211 return -EPERM;
7996a778 1212 }
843c0a8a 1213 conn->tmfcmd_pdus_cnt++;
f6d5180c 1214 conn->tmf_timer.expires = timeout * HZ + jiffies;
843c0a8a
MC		 1215 conn->tmf_timer.function = iscsi_tmf_timedout;
1216 conn->tmf_timer.data = (unsigned long)conn;
1217 add_timer(&conn->tmf_timer);
1218 debug_scsi("tmf set timeout\n");
7996a778 1219
7996a778 1220 spin_unlock_bh(&session->lock);
6724add1 1221 mutex_unlock(&session->eh_mutex);
77a23c21 1222 scsi_queue_work(session->host, &conn->xmitwork);
7996a778
MC		 1223
1224 /*
1225 * block eh thread until:
1226 *
843c0a8a
MC		 1227 * 1) tmf response
1228 * 2) tmf timeout
7996a778
MC		 1229 * 3) session is terminated or restarted or userspace has
1230 * given up on recovery
1231 */
843c0a8a 1232 wait_event_interruptible(conn->ehwait, age != session->age ||
7996a778 1233 session->state != ISCSI_STATE_LOGGED_IN ||
843c0a8a 1234 conn->tmf_state != TMF_QUEUED);
7996a778
MC		 1235 if (signal_pending(current))
1236 flush_signals(current);
843c0a8a
MC		 1237 del_timer_sync(&conn->tmf_timer);
1238
6724add1 1239 mutex_lock(&session->eh_mutex);
77a23c21 1240 spin_lock_bh(&session->lock);
843c0a8a
MC		 1241 /* if the session drops it will clean up the mtask */
1242 if (age != session->age ||
1243 session->state != ISCSI_STATE_LOGGED_IN)
1244 return -ENOTCONN;
7996a778
MC		 1245 return 0;
1246}
1247
843c0a8a
MC		 1248/*
1249 * Fail commands. session lock held and recv side suspended and xmit
1250 * thread flushed
1251 */
6eabafbe
MC		 1252static void fail_all_commands(struct iscsi_conn *conn, unsigned lun,
1253 int error)
843c0a8a
MC		 1254{
1255 struct iscsi_cmd_task *ctask, *tmp;
1256
1257 if (conn->ctask && (conn->ctask->sc->device->lun == lun || lun == -1))
1258 conn->ctask = NULL;
1259
1260 /* flush pending */
1261 list_for_each_entry_safe(ctask, tmp, &conn->xmitqueue, running) {
1262 if (lun == ctask->sc->device->lun || lun == -1) {
1263 debug_scsi("failing pending sc %p itt 0x%x\n",
1264 ctask->sc, ctask->itt);
6eabafbe 1265 fail_command(conn, ctask, error << 16);
843c0a8a
MC		 1266 }
1267 }
1268
1269 list_for_each_entry_safe(ctask, tmp, &conn->requeue, running) {
1270 if (lun == ctask->sc->device->lun || lun == -1) {
1271 debug_scsi("failing requeued sc %p itt 0x%x\n",
1272 ctask->sc, ctask->itt);
6eabafbe 1273 fail_command(conn, ctask, error << 16);
843c0a8a
MC		 1274 }
1275 }
1276
1277 /* fail all other running */
1278 list_for_each_entry_safe(ctask, tmp, &conn->run_list, running) {
1279 if (lun == ctask->sc->device->lun || lun == -1) {
1280 debug_scsi("failing in progress sc %p itt 0x%x\n",
1281 ctask->sc, ctask->itt);
1282 fail_command(conn, ctask, DID_BUS_BUSY << 16);
1283 }
1284 }
1285}
1286
6724add1
MC		 1287static void iscsi_suspend_tx(struct iscsi_conn *conn)
1288{
1289 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1290 scsi_flush_work(conn->session->host);
1291}
1292
1293static void iscsi_start_tx(struct iscsi_conn *conn)
1294{
1295 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1296 scsi_queue_work(conn->session->host, &conn->xmitwork);
1297}
1298
f6d5180c
MC		 1299static enum scsi_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *scmd)
1300{
1301 struct iscsi_cls_session *cls_session;
1302 struct iscsi_session *session;
1303 struct iscsi_conn *conn;
1304 enum scsi_eh_timer_return rc = EH_NOT_HANDLED;
1305
1306 cls_session = starget_to_session(scsi_target(scmd->device));
1307 session = class_to_transport_session(cls_session);
1308
1309 debug_scsi("scsi cmd %p timedout\n", scmd);
1310
1311 spin_lock(&session->lock);
1312 if (session->state != ISCSI_STATE_LOGGED_IN) {
1313 /*
1314 * We are probably in the middle of iscsi recovery so let
1315 * that complete and handle the error.
1316 */
1317 rc = EH_RESET_TIMER;
1318 goto done;
1319 }
1320
1321 conn = session->leadconn;
1322 if (!conn) {
1323 /* In the middle of shuting down */
1324 rc = EH_RESET_TIMER;
1325 goto done;
1326 }
1327
1328 if (!conn->recv_timeout && !conn->ping_timeout)
1329 goto done;
1330 /*
1331 * if the ping timedout then we are in the middle of cleaning up
1332 * and can let the iscsi eh handle it
1333 */
1334 if (time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) +
1335 (conn->ping_timeout * HZ), jiffies))
1336 rc = EH_RESET_TIMER;
1337 /*
1338 * if we are about to check the transport then give the command
1339 * more time
1340 */
1341 if (time_before_eq(conn->last_recv + (conn->recv_timeout * HZ),
1342 jiffies))
1343 rc = EH_RESET_TIMER;
1344 /* if in the middle of checking the transport then give us more time */
1345 if (conn->ping_mtask)
1346 rc = EH_RESET_TIMER;
1347done:
1348 spin_unlock(&session->lock);
1349 debug_scsi("return %s\n", rc == EH_RESET_TIMER ? "timer reset" : "nh");
1350 return rc;
1351}
1352
1353static void iscsi_check_transport_timeouts(unsigned long data)
1354{
1355 struct iscsi_conn *conn = (struct iscsi_conn *)data;
1356 struct iscsi_session *session = conn->session;
1357 unsigned long timeout, next_timeout = 0, last_recv;
1358
1359 spin_lock(&session->lock);
1360 if (session->state != ISCSI_STATE_LOGGED_IN)
1361 goto done;
1362
1363 timeout = conn->recv_timeout;
1364 if (!timeout)
1365 goto done;
1366
1367 timeout *= HZ;
1368 last_recv = conn->last_recv;
1369 if (time_before_eq(last_recv + timeout + (conn->ping_timeout * HZ),
1370 jiffies)) {
1371 printk(KERN_ERR "ping timeout of %d secs expired, "
1372 "last rx %lu, last ping %lu, now %lu\n",
1373 conn->ping_timeout, last_recv,
1374 conn->last_ping, jiffies);
1375 spin_unlock(&session->lock);
1376 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1377 return;
1378 }
1379
1380 if (time_before_eq(last_recv + timeout, jiffies)) {
1381 if (time_before_eq(conn->last_ping, last_recv)) {
1382 /* send a ping to try to provoke some traffic */
1383 debug_scsi("Sending nopout as ping on conn %p\n", conn);
1384 iscsi_send_nopout(conn, NULL);
1385 }
1386 next_timeout = last_recv + timeout + (conn->ping_timeout * HZ);
1387 } else {
1388 next_timeout = last_recv + timeout;
1389 }
1390
1391 if (next_timeout) {
1392 debug_scsi("Setting next tmo %lu\n", next_timeout);
1393 mod_timer(&conn->transport_timer, next_timeout);
1394 }
1395done:
1396 spin_unlock(&session->lock);
1397}
1398
843c0a8a
MC		 1399static void iscsi_prep_abort_task_pdu(struct iscsi_cmd_task *ctask,
1400 struct iscsi_tm *hdr)
1401{
1402 memset(hdr, 0, sizeof(*hdr));
1403 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
1404 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK;
1405 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
1406 memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
1407 hdr->rtt = ctask->hdr->itt;
1408 hdr->refcmdsn = ctask->hdr->cmdsn;
1409}
1410
7996a778
MC		 1411int iscsi_eh_abort(struct scsi_cmnd *sc)
1412{
6724add1
MC		 1413 struct Scsi_Host *host = sc->device->host;
1414 struct iscsi_session *session = iscsi_hostdata(host->hostdata);
f47f2cf5 1415 struct iscsi_conn *conn;
843c0a8a
MC		 1416 struct iscsi_cmd_task *ctask;
1417 struct iscsi_tm *hdr;
1418 int rc, age;
7996a778 1419
6724add1
MC		 1420 mutex_lock(&session->eh_mutex);
1421 spin_lock_bh(&session->lock);
f47f2cf5
MC		 1422 /*
1423 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
1424 * got the command.
1425 */
1426 if (!sc->SCp.ptr) {
1427 debug_scsi("sc never reached iscsi layer or it completed.\n");
6724add1
MC		 1428 spin_unlock_bh(&session->lock);
1429 mutex_unlock(&session->eh_mutex);
f47f2cf5
MC		 1430 return SUCCESS;
1431 }
1432
7996a778
MC		 1433 /*
1434 * If we are not logged in or we have started a new session
1435 * then let the host reset code handle this
1436 */
843c0a8a
MC		 1437 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN ||
1438 sc->SCp.phase != session->age) {
1439 spin_unlock_bh(&session->lock);
1440 mutex_unlock(&session->eh_mutex);
1441 return FAILED;
1442 }
1443
1444 conn = session->leadconn;
1445 conn->eh_abort_cnt++;
1446 age = session->age;
1447
1448 ctask = (struct iscsi_cmd_task *)sc->SCp.ptr;
1449 debug_scsi("aborting [sc %p itt 0x%x]\n", sc, ctask->itt);
7996a778
MC		 1450
1451 /* ctask completed before time out */
7ea8b828 1452 if (!ctask->sc) {
7ea8b828 1453 debug_scsi("sc completed while abort in progress\n");
77a23c21 1454 goto success;
7ea8b828 1455 }
7996a778 1456
77a23c21
MC		 1457 if (ctask->state == ISCSI_TASK_PENDING) {
1458 fail_command(conn, ctask, DID_ABORT << 16);
1459 goto success;
1460 }
7996a778 1461
843c0a8a
MC		 1462 /* only have one tmf outstanding at a time */
1463 if (conn->tmf_state != TMF_INITIAL)
7996a778 1464 goto failed;
843c0a8a 1465 conn->tmf_state = TMF_QUEUED;
7996a778 1466
843c0a8a
MC		 1467 hdr = &conn->tmhdr;
1468 iscsi_prep_abort_task_pdu(ctask, hdr);
1469
f6d5180c 1470 if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout)) {
843c0a8a
MC		 1471 rc = FAILED;
1472 goto failed;
1473 }
1474
1475 switch (conn->tmf_state) {
1476 case TMF_SUCCESS:
77a23c21 1477 spin_unlock_bh(&session->lock);
6724add1 1478 iscsi_suspend_tx(conn);
77a23c21
MC		 1479 /*
1480 * clean up task if aborted. grab the recv lock as a writer
1481 */
1482 write_lock_bh(conn->recv_lock);
1483 spin_lock(&session->lock);
1484 fail_command(conn, ctask, DID_ABORT << 16);
843c0a8a 1485 conn->tmf_state = TMF_INITIAL;
77a23c21
MC		 1486 spin_unlock(&session->lock);
1487 write_unlock_bh(conn->recv_lock);
6724add1 1488 iscsi_start_tx(conn);
77a23c21 1489 goto success_unlocked;
843c0a8a
MC		 1490 case TMF_TIMEDOUT:
1491 spin_unlock_bh(&session->lock);
1492 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1493 goto failed_unlocked;
1494 case TMF_NOT_FOUND:
1495 if (!sc->SCp.ptr) {
1496 conn->tmf_state = TMF_INITIAL;
7ea8b828 1497 /* ctask completed before tmf abort response */
7ea8b828 1498 debug_scsi("sc completed while abort in progress\n");
77a23c21 1499 goto success;
7ea8b828
MC		 1500 }
1501 /* fall through */
1502 default:
843c0a8a
MC		 1503 conn->tmf_state = TMF_INITIAL;
1504 goto failed;
7996a778
MC		 1505 }
1506
77a23c21 1507success:
7996a778 1508 spin_unlock_bh(&session->lock);
77a23c21
MC		 1509success_unlocked:
1510 debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
6724add1 1511 mutex_unlock(&session->eh_mutex);
7996a778
MC		 1512 return SUCCESS;
1513
1514failed:
1515 spin_unlock_bh(&session->lock);
77a23c21 1516failed_unlocked:
843c0a8a
MC		 1517 debug_scsi("abort failed [sc %p itt 0x%x]\n", sc,
1518 ctask ? ctask->itt : 0);
6724add1 1519 mutex_unlock(&session->eh_mutex);
7996a778
MC		 1520 return FAILED;
1521}
1522EXPORT_SYMBOL_GPL(iscsi_eh_abort);
1523
843c0a8a
MC		 1524static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
1525{
1526 memset(hdr, 0, sizeof(*hdr));
1527 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
1528 hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK;
1529 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
1530 int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun);
f6d5180c 1531 hdr->rtt = RESERVED_ITT;
843c0a8a
MC		 1532}
1533
1534int iscsi_eh_device_reset(struct scsi_cmnd *sc)
1535{
1536 struct Scsi_Host *host = sc->device->host;
1537 struct iscsi_session *session = iscsi_hostdata(host->hostdata);
1538 struct iscsi_conn *conn;
1539 struct iscsi_tm *hdr;
1540 int rc = FAILED;
1541
1542 debug_scsi("LU Reset [sc %p lun %u]\n", sc, sc->device->lun);
1543
1544 mutex_lock(&session->eh_mutex);
1545 spin_lock_bh(&session->lock);
1546 /*
1547 * Just check if we are not logged in. We cannot check for
1548 * the phase because the reset could come from a ioctl.
1549 */
1550 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
1551 goto unlock;
1552 conn = session->leadconn;
1553
1554 /* only have one tmf outstanding at a time */
1555 if (conn->tmf_state != TMF_INITIAL)
1556 goto unlock;
1557 conn->tmf_state = TMF_QUEUED;
1558
1559 hdr = &conn->tmhdr;
1560 iscsi_prep_lun_reset_pdu(sc, hdr);
1561
f6d5180c
MC		 1562 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
1563 session->lu_reset_timeout)) {
843c0a8a
MC		 1564 rc = FAILED;
1565 goto unlock;
1566 }
1567
1568 switch (conn->tmf_state) {
1569 case TMF_SUCCESS:
1570 break;
1571 case TMF_TIMEDOUT:
1572 spin_unlock_bh(&session->lock);
1573 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1574 goto done;
1575 default:
1576 conn->tmf_state = TMF_INITIAL;
1577 goto unlock;
1578 }
1579
1580 rc = SUCCESS;
1581 spin_unlock_bh(&session->lock);
1582
1583 iscsi_suspend_tx(conn);
1584 /* need to grab the recv lock then session lock */
1585 write_lock_bh(conn->recv_lock);
1586 spin_lock(&session->lock);
6eabafbe 1587 fail_all_commands(conn, sc->device->lun, DID_ERROR);
843c0a8a
MC		 1588 conn->tmf_state = TMF_INITIAL;
1589 spin_unlock(&session->lock);
1590 write_unlock_bh(conn->recv_lock);
1591
1592 iscsi_start_tx(conn);
1593 goto done;
1594
1595unlock:
1596 spin_unlock_bh(&session->lock);
1597done:
1598 debug_scsi("iscsi_eh_device_reset %s\n",
1599 rc == SUCCESS ? "SUCCESS" : "FAILED");
1600 mutex_unlock(&session->eh_mutex);
1601 return rc;
1602}
1603EXPORT_SYMBOL_GPL(iscsi_eh_device_reset);
1604
6320377f
OK		 1605/*
1606 * Pre-allocate a pool of @max items of @item_size. By default, the pool
1607 * should be accessed via kfifo_{get,put} on q->queue.
1608 * Optionally, the caller can obtain the array of object pointers
1609 * by passing in a non-NULL @items pointer
1610 */
7996a778 1611int
6320377f 1612iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size)
7996a778 1613{
6320377f 1614 int i, num_arrays = 1;
7996a778 1615
6320377f 1616 memset(q, 0, sizeof(*q));
7996a778
MC		 1617
1618 q->max = max;
6320377f
OK		 1619
1620 /* If the user passed an items pointer, he wants a copy of
1621 * the array. */
1622 if (items)
1623 num_arrays++;
1624 q->pool = kzalloc(num_arrays * max * sizeof(void*), GFP_KERNEL);
1625 if (q->pool == NULL)
1626 goto enomem;
7996a778
MC		 1627
1628 q->queue = kfifo_init((void*)q->pool, max * sizeof(void*),
1629 GFP_KERNEL, NULL);
6320377f
OK		 1630 if (q->queue == ERR_PTR(-ENOMEM))
1631 goto enomem;
7996a778
MC		 1632
1633 for (i = 0; i < max; i++) {
6320377f 1634 q->pool[i] = kzalloc(item_size, GFP_KERNEL);
7996a778 1635 if (q->pool[i] == NULL) {
6320377f
OK		 1636 q->max = i;
1637 goto enomem;
7996a778 1638 }
7996a778
MC		 1639 __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*));
1640 }
6320377f
OK		 1641
1642 if (items) {
1643 *items = q->pool + max;
1644 memcpy(*items, q->pool, max * sizeof(void *));
1645 }
1646
7996a778 1647 return 0;
6320377f
OK		 1648
1649enomem:
1650 iscsi_pool_free(q);
1651 return -ENOMEM;
7996a778
MC		 1652}
1653EXPORT_SYMBOL_GPL(iscsi_pool_init);
1654
6320377f 1655void iscsi_pool_free(struct iscsi_pool *q)
7996a778
MC		 1656{
1657 int i;
1658
1659 for (i = 0; i < q->max; i++)
6320377f
OK		 1660 kfree(q->pool[i]);
1661 if (q->pool)
1662 kfree(q->pool);
7996a778
MC		 1663}
1664EXPORT_SYMBOL_GPL(iscsi_pool_free);
1665
1666/*
1667 * iSCSI Session's hostdata organization:
1668 *
1669 * *------------------* <== hostdata_session(host->hostdata)
1670 * | ptr to class sess|
1671 * |------------------| <== iscsi_hostdata(host->hostdata)
1672 * | iscsi_session |
1673 * *------------------*
1674 */
1675
1676#define hostdata_privsize(_sz) (sizeof(unsigned long) + _sz + \
1677 _sz % sizeof(unsigned long))
1678
1679#define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata))
1680
1681/**
1682 * iscsi_session_setup - create iscsi cls session and host and session
1683 * @scsit: scsi transport template
1684 * @iscsit: iscsi transport template
1548271e
MC		 1685 * @cmds_max: scsi host can queue
1686 * @qdepth: scsi host cmds per lun
1687 * @cmd_task_size: LLD ctask private data size
1688 * @mgmt_task_size: LLD mtask private data size
7996a778
MC		 1689 * @initial_cmdsn: initial CmdSN
1690 * @hostno: host no allocated
1691 *
1692 * This can be used by software iscsi_transports that allocate
1693 * a session per scsi host.
1694 **/
1695struct iscsi_cls_session *
1696iscsi_session_setup(struct iscsi_transport *iscsit,
1697 struct scsi_transport_template *scsit,
1548271e 1698 uint16_t cmds_max, uint16_t qdepth,
7996a778
MC		 1699 int cmd_task_size, int mgmt_task_size,
1700 uint32_t initial_cmdsn, uint32_t *hostno)
1701{
1702 struct Scsi_Host *shost;
1703 struct iscsi_session *session;
1704 struct iscsi_cls_session *cls_session;
1705 int cmd_i;
1706
1548271e
MC		 1707 if (qdepth > ISCSI_MAX_CMD_PER_LUN || qdepth < 1) {
1708 if (qdepth != 0)
1709 printk(KERN_ERR "iscsi: invalid queue depth of %d. "
1710 "Queue depth must be between 1 and %d.\n",
1711 qdepth, ISCSI_MAX_CMD_PER_LUN);
1712 qdepth = ISCSI_DEF_CMD_PER_LUN;
1713 }
1714
11836572 1715 if (!is_power_of_2(cmds_max) ||
1548271e
MC		 1716 cmds_max >= ISCSI_MGMT_ITT_OFFSET) {
1717 if (cmds_max != 0)
1718 printk(KERN_ERR "iscsi: invalid can_queue of %d. "
1719 "can_queue must be a power of 2 and between "
1720 "2 and %d - setting to %d.\n", cmds_max,
1721 ISCSI_MGMT_ITT_OFFSET, ISCSI_DEF_XMIT_CMDS_MAX);
1722 cmds_max = ISCSI_DEF_XMIT_CMDS_MAX;
1723 }
1724
7996a778
MC		 1725 shost = scsi_host_alloc(iscsit->host_template,
1726 hostdata_privsize(sizeof(*session)));
1727 if (!shost)
1728 return NULL;
1729
1548271e
MC		 1730 /* the iscsi layer takes one task for reserve */
1731 shost->can_queue = cmds_max - 1;
1732 shost->cmd_per_lun = qdepth;
7996a778
MC		 1733 shost->max_id = 1;
1734 shost->max_channel = 0;
1735 shost->max_lun = iscsit->max_lun;
1736 shost->max_cmd_len = iscsit->max_cmd_len;
1737 shost->transportt = scsit;
1738 shost->transportt->create_work_queue = 1;
f6d5180c 1739 shost->transportt->eh_timed_out = iscsi_eh_cmd_timed_out;
7996a778
MC		 1740 *hostno = shost->host_no;
1741
1742 session = iscsi_hostdata(shost->hostdata);
1743 memset(session, 0, sizeof(struct iscsi_session));
1744 session->host = shost;
1745 session->state = ISCSI_STATE_FREE;
f6d5180c 1746 session->fast_abort = 1;
4cd49ea1
MC		 1747 session->lu_reset_timeout = 15;
1748 session->abort_timeout = 10;
7996a778 1749 session->mgmtpool_max = ISCSI_MGMT_CMDS_MAX;
1548271e 1750 session->cmds_max = cmds_max;
e0726407 1751 session->queued_cmdsn = session->cmdsn = initial_cmdsn;
7996a778
MC		 1752 session->exp_cmdsn = initial_cmdsn + 1;
1753 session->max_cmdsn = initial_cmdsn + 1;
1754 session->max_r2t = 1;
1755 session->tt = iscsit;
6724add1 1756 mutex_init(&session->eh_mutex);
7996a778
MC		 1757
1758 /* initialize SCSI PDU commands pool */
1759 if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
1760 (void***)&session->cmds,
1761 cmd_task_size + sizeof(struct iscsi_cmd_task)))
1762 goto cmdpool_alloc_fail;
1763
1764 /* pre-format cmds pool with ITT */
1765 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
1766 struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
1767
1768 if (cmd_task_size)
1769 ctask->dd_data = &ctask[1];
1770 ctask->itt = cmd_i;
b6c395ed 1771 INIT_LIST_HEAD(&ctask->running);
7996a778
MC		 1772 }
1773
1774 spin_lock_init(&session->lock);
7996a778
MC		 1775
1776 /* initialize immediate command pool */
1777 if (iscsi_pool_init(&session->mgmtpool, session->mgmtpool_max,
1778 (void***)&session->mgmt_cmds,
1779 mgmt_task_size + sizeof(struct iscsi_mgmt_task)))
1780 goto mgmtpool_alloc_fail;
1781
1782
1783 /* pre-format immediate cmds pool with ITT */
1784 for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) {
1785 struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i];
1786
1787 if (mgmt_task_size)
1788 mtask->dd_data = &mtask[1];
1789 mtask->itt = ISCSI_MGMT_ITT_OFFSET + cmd_i;
b6c395ed 1790 INIT_LIST_HEAD(&mtask->running);
7996a778
MC		 1791 }
1792
1793 if (scsi_add_host(shost, NULL))
1794 goto add_host_fail;
1795
f53a88da
MC		 1796 if (!try_module_get(iscsit->owner))
1797 goto cls_session_fail;
1798
6a8a0d36 1799 cls_session = iscsi_create_session(shost, iscsit, 0);
7996a778 1800 if (!cls_session)
f53a88da 1801 goto module_put;
7996a778
MC		 1802 *(unsigned long*)shost->hostdata = (unsigned long)cls_session;
1803
1804 return cls_session;
1805
f53a88da
MC		 1806module_put:
1807 module_put(iscsit->owner);
7996a778
MC		 1808cls_session_fail:
1809 scsi_remove_host(shost);
1810add_host_fail:
6320377f 1811 iscsi_pool_free(&session->mgmtpool);
7996a778 1812mgmtpool_alloc_fail:
6320377f 1813 iscsi_pool_free(&session->cmdpool);
7996a778
MC		 1814cmdpool_alloc_fail:
1815 scsi_host_put(shost);
1816 return NULL;
1817}
1818EXPORT_SYMBOL_GPL(iscsi_session_setup);
1819
1820/**
1821 * iscsi_session_teardown - destroy session, host, and cls_session
1822 * shost: scsi host
1823 *
1824 * This can be used by software iscsi_transports that allocate
1825 * a session per scsi host.
1826 **/
1827void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
1828{
1829 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
1830 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
63f75cc8 1831 struct module *owner = cls_session->transport->owner;
7996a778 1832
26974789 1833 iscsi_remove_session(cls_session);
7996a778
MC		 1834 scsi_remove_host(shost);
1835
6320377f
OK		 1836 iscsi_pool_free(&session->mgmtpool);
1837 iscsi_pool_free(&session->cmdpool);
7996a778 1838
b2c64167
MC		 1839 kfree(session->password);
1840 kfree(session->password_in);
1841 kfree(session->username);
1842 kfree(session->username_in);
f3ff0c36 1843 kfree(session->targetname);
d8196ed2 1844 kfree(session->netdev);
0801c242 1845 kfree(session->hwaddress);
8ad5781a 1846 kfree(session->initiatorname);
f3ff0c36 1847
26974789 1848 iscsi_free_session(cls_session);
7996a778 1849 scsi_host_put(shost);
63f75cc8 1850 module_put(owner);
7996a778
MC		 1851}
1852EXPORT_SYMBOL_GPL(iscsi_session_teardown);
1853
1854/**
1855 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
1856 * @cls_session: iscsi_cls_session
1857 * @conn_idx: cid
1858 **/
1859struct iscsi_cls_conn *
1860iscsi_conn_setup(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
1861{
1862 struct iscsi_session *session = class_to_transport_session(cls_session);
1863 struct iscsi_conn *conn;
1864 struct iscsi_cls_conn *cls_conn;
d36ab6f3 1865 char *data;
7996a778
MC		 1866
1867 cls_conn = iscsi_create_conn(cls_session, conn_idx);
1868 if (!cls_conn)
1869 return NULL;
1870 conn = cls_conn->dd_data;
1871 memset(conn, 0, sizeof(*conn));
1872
1873 conn->session = session;
1874 conn->cls_conn = cls_conn;
1875 conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
1876 conn->id = conn_idx;
1877 conn->exp_statsn = 0;
843c0a8a 1878 conn->tmf_state = TMF_INITIAL;
f6d5180c
MC		 1879
1880 init_timer(&conn->transport_timer);
1881 conn->transport_timer.data = (unsigned long)conn;
1882 conn->transport_timer.function = iscsi_check_transport_timeouts;
1883
7996a778
MC		 1884 INIT_LIST_HEAD(&conn->run_list);
1885 INIT_LIST_HEAD(&conn->mgmt_run_list);
843c0a8a 1886 INIT_LIST_HEAD(&conn->mgmtqueue);
b6c395ed 1887 INIT_LIST_HEAD(&conn->xmitqueue);
843c0a8a 1888 INIT_LIST_HEAD(&conn->requeue);
c4028958 1889 INIT_WORK(&conn->xmitwork, iscsi_xmitworker);
7996a778
MC		 1890
1891 /* allocate login_mtask used for the login/text sequences */
1892 spin_lock_bh(&session->lock);
1893 if (!__kfifo_get(session->mgmtpool.queue,
1894 (void*)&conn->login_mtask,
1895 sizeof(void*))) {
1896 spin_unlock_bh(&session->lock);
1897 goto login_mtask_alloc_fail;
1898 }
1899 spin_unlock_bh(&session->lock);
1900
bf32ed33 1901 data = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN, GFP_KERNEL);
d36ab6f3
MC		 1902 if (!data)
1903 goto login_mtask_data_alloc_fail;
c8dc1e52 1904 conn->login_mtask->data = conn->data = data;
d36ab6f3 1905
843c0a8a 1906 init_timer(&conn->tmf_timer);
7996a778
MC		 1907 init_waitqueue_head(&conn->ehwait);
1908
1909 return cls_conn;
1910
d36ab6f3
MC		 1911login_mtask_data_alloc_fail:
1912 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
1913 sizeof(void*));
7996a778 1914login_mtask_alloc_fail:
7996a778
MC		 1915 iscsi_destroy_conn(cls_conn);
1916 return NULL;
1917}
1918EXPORT_SYMBOL_GPL(iscsi_conn_setup);
1919
1920/**
1921 * iscsi_conn_teardown - teardown iscsi connection
1922 * cls_conn: iscsi class connection
1923 *
1924 * TODO: we may need to make this into a two step process
1925 * like scsi-mls remove + put host
1926 */
1927void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
1928{
1929 struct iscsi_conn *conn = cls_conn->dd_data;
1930 struct iscsi_session *session = conn->session;
1931 unsigned long flags;
1932
f6d5180c
MC		 1933 del_timer_sync(&conn->transport_timer);
1934
7996a778
MC		 1935 spin_lock_bh(&session->lock);
1936 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
1937 if (session->leadconn == conn) {
1938 /*
1939 * leading connection? then give up on recovery.
1940 */
1941 session->state = ISCSI_STATE_TERMINATE;
1942 wake_up(&conn->ehwait);
1943 }
1944 spin_unlock_bh(&session->lock);
1945
7996a778
MC		 1946 /*
1947 * Block until all in-progress commands for this connection
1948 * time out or fail.
1949 */
1950 for (;;) {
1951 spin_lock_irqsave(session->host->host_lock, flags);
1952 if (!session->host->host_busy) { /* OK for ERL == 0 */
1953 spin_unlock_irqrestore(session->host->host_lock, flags);
1954 break;
1955 }
1956 spin_unlock_irqrestore(session->host->host_lock, flags);
1957 msleep_interruptible(500);
be2df72e
OG		 1958 printk(KERN_INFO "iscsi: scsi conn_destroy(): host_busy %d "
1959 "host_failed %d\n", session->host->host_busy,
1960 session->host->host_failed);
7996a778
MC		 1961 /*
1962 * force eh_abort() to unblock
1963 */
1964 wake_up(&conn->ehwait);
1965 }
1966
779ea120 1967 /* flush queued up work because we free the connection below */
843c0a8a 1968 iscsi_suspend_tx(conn);
779ea120 1969
7996a778 1970 spin_lock_bh(&session->lock);
c8dc1e52 1971 kfree(conn->data);
f3ff0c36 1972 kfree(conn->persistent_address);
7996a778
MC		 1973 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
1974 sizeof(void*));
e0726407 1975 if (session->leadconn == conn)
7996a778 1976 session->leadconn = NULL;
7996a778
MC		 1977 spin_unlock_bh(&session->lock);
1978
7996a778
MC		 1979 iscsi_destroy_conn(cls_conn);
1980}
1981EXPORT_SYMBOL_GPL(iscsi_conn_teardown);
1982
1983int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
1984{
1985 struct iscsi_conn *conn = cls_conn->dd_data;
1986 struct iscsi_session *session = conn->session;
1987
ffd0436e 1988 if (!session) {
7996a778
MC		 1989 printk(KERN_ERR "iscsi: can't start unbound connection\n");
1990 return -EPERM;
1991 }
1992
db98ccde
MC		 1993 if ((session->imm_data_en || !session->initial_r2t_en) &&
1994 session->first_burst > session->max_burst) {
ffd0436e
MC		 1995 printk("iscsi: invalid burst lengths: "
1996 "first_burst %d max_burst %d\n",
1997 session->first_burst, session->max_burst);
1998 return -EINVAL;
1999 }
2000
f6d5180c
MC		 2001 if (conn->ping_timeout && !conn->recv_timeout) {
2002 printk(KERN_ERR "iscsi: invalid recv timeout of zero "
2003 "Using 5 seconds\n.");
2004 conn->recv_timeout = 5;
2005 }
2006
2007 if (conn->recv_timeout && !conn->ping_timeout) {
2008 printk(KERN_ERR "iscsi: invalid ping timeout of zero "
2009 "Using 5 seconds.\n");
2010 conn->ping_timeout = 5;
2011 }
2012
7996a778
MC		 2013 spin_lock_bh(&session->lock);
2014 conn->c_stage = ISCSI_CONN_STARTED;
2015 session->state = ISCSI_STATE_LOGGED_IN;
e0726407 2016 session->queued_cmdsn = session->cmdsn;
7996a778 2017
f6d5180c
MC		 2018 conn->last_recv = jiffies;
2019 conn->last_ping = jiffies;
2020 if (conn->recv_timeout && conn->ping_timeout)
2021 mod_timer(&conn->transport_timer,
2022 jiffies + (conn->recv_timeout * HZ));
2023
7996a778
MC		 2024 switch(conn->stop_stage) {
2025 case STOP_CONN_RECOVER:
2026 /*
2027 * unblock eh_abort() if it is blocked. re-try all
2028 * commands after successful recovery
2029 */
7996a778 2030 conn->stop_stage = 0;
843c0a8a 2031 conn->tmf_state = TMF_INITIAL;
7996a778 2032 session->age++;
6eabafbe 2033 break;
7996a778 2034 case STOP_CONN_TERM:
7996a778 2035 conn->stop_stage = 0;
7996a778
MC		 2036 break;
2037 default:
2038 break;
2039 }
2040 spin_unlock_bh(&session->lock);
2041
6eabafbe
MC		 2042 iscsi_unblock_session(session_to_cls(session));
2043 wake_up(&conn->ehwait);
7996a778
MC		 2044 return 0;
2045}
2046EXPORT_SYMBOL_GPL(iscsi_conn_start);
2047
2048static void
2049flush_control_queues(struct iscsi_session *session, struct iscsi_conn *conn)
2050{
2051 struct iscsi_mgmt_task *mtask, *tmp;
2052
2053 /* handle pending */
843c0a8a
MC		 2054 list_for_each_entry_safe(mtask, tmp, &conn->mgmtqueue, running) {
2055 debug_scsi("flushing pending mgmt task itt 0x%x\n", mtask->itt);
b3a7ea8d 2056 iscsi_free_mgmt_task(conn, mtask);
7996a778
MC		 2057 }
2058
2059 /* handle running */
2060 list_for_each_entry_safe(mtask, tmp, &conn->mgmt_run_list, running) {
2061 debug_scsi("flushing running mgmt task itt 0x%x\n", mtask->itt);
b3a7ea8d 2062 iscsi_free_mgmt_task(conn, mtask);
7996a778
MC		 2063 }
2064
2065 conn->mtask = NULL;
2066}
2067
656cffc9
MC		 2068static void iscsi_start_session_recovery(struct iscsi_session *session,
2069 struct iscsi_conn *conn, int flag)
7996a778 2070{
ed2abc7f
MC		 2071 int old_stop_stage;
2072
f6d5180c
MC		 2073 del_timer_sync(&conn->transport_timer);
2074
6724add1 2075 mutex_lock(&session->eh_mutex);
7996a778 2076 spin_lock_bh(&session->lock);
ed2abc7f 2077 if (conn->stop_stage == STOP_CONN_TERM) {
7996a778 2078 spin_unlock_bh(&session->lock);
6724add1
MC		 2079 mutex_unlock(&session->eh_mutex);
2080 return;
2081 }
2082
2083 /*
2084 * The LLD either freed/unset the lock on us, or userspace called
2085 * stop but did not create a proper connection (connection was never
2086 * bound or it was unbound then stop was called).
2087 */
2088 if (!conn->recv_lock) {
2089 spin_unlock_bh(&session->lock);
2090 mutex_unlock(&session->eh_mutex);
7996a778
MC		 2091 return;
2092 }
ed2abc7f
MC		 2093
2094 /*
2095 * When this is called for the in_login state, we only want to clean
67a61114
MC		 2096 * up the login task and connection. We do not need to block and set
2097 * the recovery state again
ed2abc7f 2098 */
67a61114
MC		 2099 if (flag == STOP_CONN_TERM)
2100 session->state = ISCSI_STATE_TERMINATE;
2101 else if (conn->stop_stage != STOP_CONN_RECOVER)
2102 session->state = ISCSI_STATE_IN_RECOVERY;
ed2abc7f
MC		 2103
2104 old_stop_stage = conn->stop_stage;
7996a778 2105 conn->stop_stage = flag;
67a61114 2106 conn->c_stage = ISCSI_CONN_STOPPED;
7996a778 2107 spin_unlock_bh(&session->lock);
6724add1
MC		 2108
2109 iscsi_suspend_tx(conn);
7996a778 2110
1c83469d
MC		 2111 write_lock_bh(conn->recv_lock);
2112 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
2113 write_unlock_bh(conn->recv_lock);
7996a778 2114
7996a778
MC		 2115 /*
2116 * for connection level recovery we should not calculate
2117 * header digest. conn->hdr_size used for optimization
2118 * in hdr_extract() and will be re-negotiated at
2119 * set_param() time.
2120 */
2121 if (flag == STOP_CONN_RECOVER) {
2122 conn->hdrdgst_en = 0;
2123 conn->datadgst_en = 0;
656cffc9 2124 if (session->state == ISCSI_STATE_IN_RECOVERY &&
67a61114
MC		 2125 old_stop_stage != STOP_CONN_RECOVER) {
2126 debug_scsi("blocking session\n");
7996a778 2127 iscsi_block_session(session_to_cls(session));
67a61114 2128 }
7996a778 2129 }
656cffc9 2130
656cffc9
MC		 2131 /*
2132 * flush queues.
2133 */
2134 spin_lock_bh(&session->lock);
6eabafbe
MC		 2135 fail_all_commands(conn, -1,
2136 STOP_CONN_RECOVER ? DID_BUS_BUSY : DID_ERROR);
656cffc9
MC		 2137 flush_control_queues(session, conn);
2138 spin_unlock_bh(&session->lock);
6724add1 2139 mutex_unlock(&session->eh_mutex);
7996a778 2140}
7996a778
MC		 2141
2142void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
2143{
2144 struct iscsi_conn *conn = cls_conn->dd_data;
2145 struct iscsi_session *session = conn->session;
2146
2147 switch (flag) {
2148 case STOP_CONN_RECOVER:
2149 case STOP_CONN_TERM:
2150 iscsi_start_session_recovery(session, conn, flag);
8d2860b3 2151 break;
7996a778 2152 default:
be2df72e 2153 printk(KERN_ERR "iscsi: invalid stop flag %d\n", flag);
7996a778
MC		 2154 }
2155}
2156EXPORT_SYMBOL_GPL(iscsi_conn_stop);
2157
2158int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
2159 struct iscsi_cls_conn *cls_conn, int is_leading)
2160{
2161 struct iscsi_session *session = class_to_transport_session(cls_session);
98644047 2162 struct iscsi_conn *conn = cls_conn->dd_data;
7996a778 2163
7996a778 2164 spin_lock_bh(&session->lock);
7996a778
MC		 2165 if (is_leading)
2166 session->leadconn = conn;
98644047 2167 spin_unlock_bh(&session->lock);
7996a778
MC		 2168
2169 /*
2170 * Unblock xmitworker(), Login Phase will pass through.
2171 */
2172 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
2173 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
2174 return 0;
2175}
2176EXPORT_SYMBOL_GPL(iscsi_conn_bind);
2177
a54a52ca
MC		 2178
2179int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
2180 enum iscsi_param param, char *buf, int buflen)
2181{
2182 struct iscsi_conn *conn = cls_conn->dd_data;
2183 struct iscsi_session *session = conn->session;
2184 uint32_t value;
2185
2186 switch(param) {
843c0a8a
MC		 2187 case ISCSI_PARAM_FAST_ABORT:
2188 sscanf(buf, "%d", &session->fast_abort);
2189 break;
f6d5180c
MC		 2190 case ISCSI_PARAM_ABORT_TMO:
2191 sscanf(buf, "%d", &session->abort_timeout);
2192 break;
2193 case ISCSI_PARAM_LU_RESET_TMO:
2194 sscanf(buf, "%d", &session->lu_reset_timeout);
2195 break;
2196 case ISCSI_PARAM_PING_TMO:
2197 sscanf(buf, "%d", &conn->ping_timeout);
2198 break;
2199 case ISCSI_PARAM_RECV_TMO:
2200 sscanf(buf, "%d", &conn->recv_timeout);
2201 break;
a54a52ca
MC		 2202 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2203 sscanf(buf, "%d", &conn->max_recv_dlength);
2204 break;
2205 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2206 sscanf(buf, "%d", &conn->max_xmit_dlength);
2207 break;
2208 case ISCSI_PARAM_HDRDGST_EN:
2209 sscanf(buf, "%d", &conn->hdrdgst_en);
2210 break;
2211 case ISCSI_PARAM_DATADGST_EN:
2212 sscanf(buf, "%d", &conn->datadgst_en);
2213 break;
2214 case ISCSI_PARAM_INITIAL_R2T_EN:
2215 sscanf(buf, "%d", &session->initial_r2t_en);
2216 break;
2217 case ISCSI_PARAM_MAX_R2T:
2218 sscanf(buf, "%d", &session->max_r2t);
2219 break;
2220 case ISCSI_PARAM_IMM_DATA_EN:
2221 sscanf(buf, "%d", &session->imm_data_en);
2222 break;
2223 case ISCSI_PARAM_FIRST_BURST:
2224 sscanf(buf, "%d", &session->first_burst);
2225 break;
2226 case ISCSI_PARAM_MAX_BURST:
2227 sscanf(buf, "%d", &session->max_burst);
2228 break;
2229 case ISCSI_PARAM_PDU_INORDER_EN:
2230 sscanf(buf, "%d", &session->pdu_inorder_en);
2231 break;
2232 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2233 sscanf(buf, "%d", &session->dataseq_inorder_en);
2234 break;
2235 case ISCSI_PARAM_ERL:
2236 sscanf(buf, "%d", &session->erl);
2237 break;
2238 case ISCSI_PARAM_IFMARKER_EN:
2239 sscanf(buf, "%d", &value);
2240 BUG_ON(value);
2241 break;
2242 case ISCSI_PARAM_OFMARKER_EN:
2243 sscanf(buf, "%d", &value);
2244 BUG_ON(value);
2245 break;
2246 case ISCSI_PARAM_EXP_STATSN:
2247 sscanf(buf, "%u", &conn->exp_statsn);
2248 break;
b2c64167
MC		 2249 case ISCSI_PARAM_USERNAME:
2250 kfree(session->username);
2251 session->username = kstrdup(buf, GFP_KERNEL);
2252 if (!session->username)
2253 return -ENOMEM;
2254 break;
2255 case ISCSI_PARAM_USERNAME_IN:
2256 kfree(session->username_in);
2257 session->username_in = kstrdup(buf, GFP_KERNEL);
2258 if (!session->username_in)
2259 return -ENOMEM;
2260 break;
2261 case ISCSI_PARAM_PASSWORD:
2262 kfree(session->password);
2263 session->password = kstrdup(buf, GFP_KERNEL);
2264 if (!session->password)
2265 return -ENOMEM;
2266 break;
2267 case ISCSI_PARAM_PASSWORD_IN:
2268 kfree(session->password_in);
2269 session->password_in = kstrdup(buf, GFP_KERNEL);
2270 if (!session->password_in)
2271 return -ENOMEM;
2272 break;
a54a52ca
MC		 2273 case ISCSI_PARAM_TARGET_NAME:
2274 /* this should not change between logins */
2275 if (session->targetname)
2276 break;
2277
2278 session->targetname = kstrdup(buf, GFP_KERNEL);
2279 if (!session->targetname)
2280 return -ENOMEM;
2281 break;
2282 case ISCSI_PARAM_TPGT:
2283 sscanf(buf, "%d", &session->tpgt);
2284 break;
2285 case ISCSI_PARAM_PERSISTENT_PORT:
2286 sscanf(buf, "%d", &conn->persistent_port);
2287 break;
2288 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2289 /*
2290 * this is the address returned in discovery so it should
2291 * not change between logins.
2292 */
2293 if (conn->persistent_address)
2294 break;
2295
2296 conn->persistent_address = kstrdup(buf, GFP_KERNEL);
2297 if (!conn->persistent_address)
2298 return -ENOMEM;
2299 break;
2300 default:
2301 return -ENOSYS;
2302 }
2303
2304 return 0;
2305}
2306EXPORT_SYMBOL_GPL(iscsi_set_param);
2307
2308int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
2309 enum iscsi_param param, char *buf)
2310{
2311 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
2312 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
2313 int len;
2314
2315 switch(param) {
843c0a8a
MC		 2316 case ISCSI_PARAM_FAST_ABORT:
2317 len = sprintf(buf, "%d\n", session->fast_abort);
2318 break;
f6d5180c
MC		 2319 case ISCSI_PARAM_ABORT_TMO:
2320 len = sprintf(buf, "%d\n", session->abort_timeout);
2321 break;
2322 case ISCSI_PARAM_LU_RESET_TMO:
2323 len = sprintf(buf, "%d\n", session->lu_reset_timeout);
2324 break;
a54a52ca
MC		 2325 case ISCSI_PARAM_INITIAL_R2T_EN:
2326 len = sprintf(buf, "%d\n", session->initial_r2t_en);
2327 break;
2328 case ISCSI_PARAM_MAX_R2T:
2329 len = sprintf(buf, "%hu\n", session->max_r2t);
2330 break;
2331 case ISCSI_PARAM_IMM_DATA_EN:
2332 len = sprintf(buf, "%d\n", session->imm_data_en);
2333 break;
2334 case ISCSI_PARAM_FIRST_BURST:
2335 len = sprintf(buf, "%u\n", session->first_burst);
2336 break;
2337 case ISCSI_PARAM_MAX_BURST:
2338 len = sprintf(buf, "%u\n", session->max_burst);
2339 break;
2340 case ISCSI_PARAM_PDU_INORDER_EN:
2341 len = sprintf(buf, "%d\n", session->pdu_inorder_en);
2342 break;
2343 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2344 len = sprintf(buf, "%d\n", session->dataseq_inorder_en);
2345 break;
2346 case ISCSI_PARAM_ERL:
2347 len = sprintf(buf, "%d\n", session->erl);
2348 break;
2349 case ISCSI_PARAM_TARGET_NAME:
2350 len = sprintf(buf, "%s\n", session->targetname);
2351 break;
2352 case ISCSI_PARAM_TPGT:
2353 len = sprintf(buf, "%d\n", session->tpgt);
2354 break;
b2c64167
MC		 2355 case ISCSI_PARAM_USERNAME:
2356 len = sprintf(buf, "%s\n", session->username);
2357 break;
2358 case ISCSI_PARAM_USERNAME_IN:
2359 len = sprintf(buf, "%s\n", session->username_in);
2360 break;
2361 case ISCSI_PARAM_PASSWORD:
2362 len = sprintf(buf, "%s\n", session->password);
2363 break;
2364 case ISCSI_PARAM_PASSWORD_IN:
2365 len = sprintf(buf, "%s\n", session->password_in);
2366 break;
a54a52ca
MC		 2367 default:
2368 return -ENOSYS;
2369 }
2370
2371 return len;
2372}
2373EXPORT_SYMBOL_GPL(iscsi_session_get_param);
2374
2375int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
2376 enum iscsi_param param, char *buf)
2377{
2378 struct iscsi_conn *conn = cls_conn->dd_data;
2379 int len;
2380
2381 switch(param) {
f6d5180c
MC		 2382 case ISCSI_PARAM_PING_TMO:
2383 len = sprintf(buf, "%u\n", conn->ping_timeout);
2384 break;
2385 case ISCSI_PARAM_RECV_TMO:
2386 len = sprintf(buf, "%u\n", conn->recv_timeout);
2387 break;
a54a52ca
MC		 2388 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2389 len = sprintf(buf, "%u\n", conn->max_recv_dlength);
2390 break;
2391 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2392 len = sprintf(buf, "%u\n", conn->max_xmit_dlength);
2393 break;
2394 case ISCSI_PARAM_HDRDGST_EN:
2395 len = sprintf(buf, "%d\n", conn->hdrdgst_en);
2396 break;
2397 case ISCSI_PARAM_DATADGST_EN:
2398 len = sprintf(buf, "%d\n", conn->datadgst_en);
2399 break;
2400 case ISCSI_PARAM_IFMARKER_EN:
2401 len = sprintf(buf, "%d\n", conn->ifmarker_en);
2402 break;
2403 case ISCSI_PARAM_OFMARKER_EN:
2404 len = sprintf(buf, "%d\n", conn->ofmarker_en);
2405 break;
2406 case ISCSI_PARAM_EXP_STATSN:
2407 len = sprintf(buf, "%u\n", conn->exp_statsn);
2408 break;
2409 case ISCSI_PARAM_PERSISTENT_PORT:
2410 len = sprintf(buf, "%d\n", conn->persistent_port);
2411 break;
2412 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2413 len = sprintf(buf, "%s\n", conn->persistent_address);
2414 break;
2415 default:
2416 return -ENOSYS;
2417 }
2418
2419 return len;
2420}
2421EXPORT_SYMBOL_GPL(iscsi_conn_get_param);
2422
0801c242
MC		 2423int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2424 char *buf)
2425{
2426 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
2427 int len;
2428
2429 switch (param) {
d8196ed2
MC		 2430 case ISCSI_HOST_PARAM_NETDEV_NAME:
2431 if (!session->netdev)
2432 len = sprintf(buf, "%s\n", "default");
2433 else
2434 len = sprintf(buf, "%s\n", session->netdev);
2435 break;
0801c242
MC		 2436 case ISCSI_HOST_PARAM_HWADDRESS:
2437 if (!session->hwaddress)
2438 len = sprintf(buf, "%s\n", "default");
2439 else
2440 len = sprintf(buf, "%s\n", session->hwaddress);
2441 break;
8ad5781a
MC		 2442 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2443 if (!session->initiatorname)
2444 len = sprintf(buf, "%s\n", "unknown");
2445 else
2446 len = sprintf(buf, "%s\n", session->initiatorname);
2447 break;
2448
0801c242
MC		 2449 default:
2450 return -ENOSYS;
2451 }
2452
2453 return len;
2454}
2455EXPORT_SYMBOL_GPL(iscsi_host_get_param);
2456
2457int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2458 char *buf, int buflen)
2459{
2460 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
2461
2462 switch (param) {
d8196ed2
MC		 2463 case ISCSI_HOST_PARAM_NETDEV_NAME:
2464 if (!session->netdev)
2465 session->netdev = kstrdup(buf, GFP_KERNEL);
2466 break;
0801c242
MC		 2467 case ISCSI_HOST_PARAM_HWADDRESS:
2468 if (!session->hwaddress)
2469 session->hwaddress = kstrdup(buf, GFP_KERNEL);
2470 break;
8ad5781a
MC		 2471 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2472 if (!session->initiatorname)
2473 session->initiatorname = kstrdup(buf, GFP_KERNEL);
2474 break;
0801c242
MC		 2475 default:
2476 return -ENOSYS;
2477 }
2478
2479 return 0;
2480}
2481EXPORT_SYMBOL_GPL(iscsi_host_set_param);
2482
7996a778
MC		 2483MODULE_AUTHOR("Mike Christie");
2484MODULE_DESCRIPTION("iSCSI library functions");
2485MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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