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[SCSI] zfcp: Fix error handling for blocked unit for send FCP command
[mirror_ubuntu-artful-kernel.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);
8b1d0343 163 hdr->itt = build_itt(ctask->itt, session->age);
a8ac6311
OK		 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:
322d739d
MC		 419 iscsi_conn_printk(KERN_ERR, conn,
420 "Got CHECK_CONDITION but invalid data "
421 "buffer size of %d\n", datalen);
7996a778
MC		 422 sc->result = DID_BAD_TARGET << 16;
423 goto out;
424 }
425
8eb00539 426 senselen = be16_to_cpu(get_unaligned((__be16 *) data));
7996a778
MC		 427 if (datalen < senselen)
428 goto invalid_datalen;
429
430 memcpy(sc->sense_buffer, data + 2,
9b80cb4b 431 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
7996a778 432 debug_scsi("copied %d bytes of sense\n",
8eb00539 433 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
7996a778
MC		 434 }
435
7207fea4
BH		 436 if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW |
437 ISCSI_FLAG_CMD_OVERFLOW)) {
7996a778
MC		 438 int res_count = be32_to_cpu(rhdr->residual_count);
439
7207fea4
BH		 440 if (res_count > 0 &&
441 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
442 res_count <= scsi_bufflen(sc)))
1c138991 443 scsi_set_resid(sc, res_count);
7996a778
MC		 444 else
445 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
7207fea4
BH		 446 } else if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW |
447 ISCSI_FLAG_CMD_BIDI_OVERFLOW))
7996a778 448 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
7996a778
MC		 449
450out:
451 debug_scsi("done [sc %lx res %d itt 0x%x]\n",
452 (long)sc, sc->result, ctask->itt);
453 conn->scsirsp_pdus_cnt++;
454
60ecebf5 455 __iscsi_put_ctask(ctask);
7996a778
MC		 456}
457
7ea8b828
MC		 458static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
459{
460 struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr;
461
462 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
463 conn->tmfrsp_pdus_cnt++;
464
843c0a8a 465 if (conn->tmf_state != TMF_QUEUED)
7ea8b828
MC		 466 return;
467
468 if (tmf->response == ISCSI_TMF_RSP_COMPLETE)
843c0a8a 469 conn->tmf_state = TMF_SUCCESS;
7ea8b828 470 else if (tmf->response == ISCSI_TMF_RSP_NO_TASK)
843c0a8a 471 conn->tmf_state = TMF_NOT_FOUND;
7ea8b828 472 else
843c0a8a 473 conn->tmf_state = TMF_FAILED;
7ea8b828
MC		 474 wake_up(&conn->ehwait);
475}
476
f6d5180c
MC		 477static void iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr)
478{
479 struct iscsi_nopout hdr;
480 struct iscsi_mgmt_task *mtask;
481
482 if (!rhdr && conn->ping_mtask)
483 return;
484
485 memset(&hdr, 0, sizeof(struct iscsi_nopout));
486 hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE;
487 hdr.flags = ISCSI_FLAG_CMD_FINAL;
488
489 if (rhdr) {
490 memcpy(hdr.lun, rhdr->lun, 8);
491 hdr.ttt = rhdr->ttt;
492 hdr.itt = RESERVED_ITT;
493 } else
494 hdr.ttt = RESERVED_ITT;
495
496 mtask = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0);
497 if (!mtask) {
322d739d 498 iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n");
f6d5180c
MC		 499 return;
500 }
501
502 /* only track our nops */
503 if (!rhdr) {
504 conn->ping_mtask = mtask;
505 conn->last_ping = jiffies;
506 }
507 scsi_queue_work(conn->session->host, &conn->xmitwork);
508}
509
62f38300
MC		 510static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
511 char *data, int datalen)
512{
513 struct iscsi_reject *reject = (struct iscsi_reject *)hdr;
514 struct iscsi_hdr rejected_pdu;
515 uint32_t itt;
516
517 conn->exp_statsn = be32_to_cpu(reject->statsn) + 1;
518
519 if (reject->reason == ISCSI_REASON_DATA_DIGEST_ERROR) {
520 if (ntoh24(reject->dlength) > datalen)
521 return ISCSI_ERR_PROTO;
522
523 if (ntoh24(reject->dlength) >= sizeof(struct iscsi_hdr)) {
524 memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr));
b4377356 525 itt = get_itt(rejected_pdu.itt);
322d739d
MC		 526 iscsi_conn_printk(KERN_ERR, conn,
527 "itt 0x%x had pdu (op 0x%x) rejected "
528 "due to DataDigest error.\n", itt,
529 rejected_pdu.opcode);
62f38300
MC		 530 }
531 }
532 return 0;
533}
534
7996a778
MC		 535/**
536 * __iscsi_complete_pdu - complete pdu
537 * @conn: iscsi conn
538 * @hdr: iscsi header
539 * @data: data buffer
540 * @datalen: len of data buffer
541 *
542 * Completes pdu processing by freeing any resources allocated at
543 * queuecommand or send generic. session lock must be held and verify
544 * itt must have been called.
545 */
f8d9d654
AB		 546static int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
547 char *data, int datalen)
7996a778
MC		 548{
549 struct iscsi_session *session = conn->session;
550 int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0;
551 struct iscsi_cmd_task *ctask;
552 struct iscsi_mgmt_task *mtask;
553 uint32_t itt;
554
f6d5180c 555 conn->last_recv = jiffies;
b4377356
AV		 556 if (hdr->itt != RESERVED_ITT)
557 itt = get_itt(hdr->itt);
7996a778 558 else
b4377356 559 itt = ~0U;
7996a778
MC		 560
561 if (itt < session->cmds_max) {
562 ctask = session->cmds[itt];
563
564 debug_scsi("cmdrsp [op 0x%x cid %d itt 0x%x len %d]\n",
565 opcode, conn->id, ctask->itt, datalen);
566
567 switch(opcode) {
568 case ISCSI_OP_SCSI_CMD_RSP:
569 BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
77a23c21
MC		 570 iscsi_scsi_cmd_rsp(conn, hdr, ctask, data,
571 datalen);
7996a778
MC		 572 break;
573 case ISCSI_OP_SCSI_DATA_IN:
574 BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
575 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
576 conn->scsirsp_pdus_cnt++;
60ecebf5 577 __iscsi_put_ctask(ctask);
7996a778
MC		 578 }
579 break;
580 case ISCSI_OP_R2T:
581 /* LLD handles this for now */
582 break;
583 default:
584 rc = ISCSI_ERR_BAD_OPCODE;
585 break;
586 }
587 } else if (itt >= ISCSI_MGMT_ITT_OFFSET &&
588 itt < ISCSI_MGMT_ITT_OFFSET + session->mgmtpool_max) {
589 mtask = session->mgmt_cmds[itt - ISCSI_MGMT_ITT_OFFSET];
590
591 debug_scsi("immrsp [op 0x%x cid %d itt 0x%x len %d]\n",
592 opcode, conn->id, mtask->itt, datalen);
593
77a23c21 594 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
7996a778 595 switch(opcode) {
8d2860b3 596 case ISCSI_OP_LOGOUT_RSP:
c8dc1e52
MC		 597 if (datalen) {
598 rc = ISCSI_ERR_PROTO;
599 break;
600 }
8d2860b3
MC		 601 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
602 /* fall through */
7996a778
MC		 603 case ISCSI_OP_LOGIN_RSP:
604 case ISCSI_OP_TEXT_RSP:
8d2860b3
MC		 605 /*
606 * login related PDU's exp_statsn is handled in
607 * userspace
608 */
40527afe
MC		 609 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
610 rc = ISCSI_ERR_CONN_FAILED;
b3a7ea8d 611 iscsi_free_mgmt_task(conn, mtask);
7996a778
MC		 612 break;
613 case ISCSI_OP_SCSI_TMFUNC_RSP:
7996a778
MC		 614 if (datalen) {
615 rc = ISCSI_ERR_PROTO;
616 break;
617 }
8d2860b3 618
7ea8b828 619 iscsi_tmf_rsp(conn, hdr);
b3a7ea8d 620 iscsi_free_mgmt_task(conn, mtask);
7996a778
MC		 621 break;
622 case ISCSI_OP_NOOP_IN:
f6d5180c
MC		 623 if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) ||
624 datalen) {
7996a778
MC		 625 rc = ISCSI_ERR_PROTO;
626 break;
627 }
7996a778
MC		 628 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
629
f6d5180c
MC		 630 if (conn->ping_mtask != mtask) {
631 /*
632 * If this is not in response to one of our
633 * nops then it must be from userspace.
634 */
635 if (iscsi_recv_pdu(conn->cls_conn, hdr, data,
636 datalen))
637 rc = ISCSI_ERR_CONN_FAILED;
638 }
b3a7ea8d 639 iscsi_free_mgmt_task(conn, mtask);
7996a778
MC		 640 break;
641 default:
642 rc = ISCSI_ERR_BAD_OPCODE;
643 break;
644 }
b4377356 645 } else if (itt == ~0U) {
77a23c21 646 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
62f38300 647
7996a778
MC		 648 switch(opcode) {
649 case ISCSI_OP_NOOP_IN:
40527afe 650 if (datalen) {
7996a778 651 rc = ISCSI_ERR_PROTO;
40527afe
MC		 652 break;
653 }
654
b4377356 655 if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG))
40527afe
MC		 656 break;
657
f6d5180c 658 iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr);
7996a778
MC		 659 break;
660 case ISCSI_OP_REJECT:
62f38300
MC		 661 rc = iscsi_handle_reject(conn, hdr, data, datalen);
662 break;
7996a778 663 case ISCSI_OP_ASYNC_EVENT:
8d2860b3 664 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
5831c737
MC		 665 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
666 rc = ISCSI_ERR_CONN_FAILED;
7996a778
MC		 667 break;
668 default:
669 rc = ISCSI_ERR_BAD_OPCODE;
670 break;
671 }
672 } else
673 rc = ISCSI_ERR_BAD_ITT;
674
675 return rc;
676}
7996a778
MC		 677
678int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
679 char *data, int datalen)
680{
681 int rc;
682
683 spin_lock(&conn->session->lock);
684 rc = __iscsi_complete_pdu(conn, hdr, data, datalen);
685 spin_unlock(&conn->session->lock);
686 return rc;
687}
688EXPORT_SYMBOL_GPL(iscsi_complete_pdu);
689
690/* verify itt (itt encoding: age+cid+itt) */
691int iscsi_verify_itt(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
692 uint32_t *ret_itt)
693{
694 struct iscsi_session *session = conn->session;
695 struct iscsi_cmd_task *ctask;
696 uint32_t itt;
697
b4377356
AV		 698 if (hdr->itt != RESERVED_ITT) {
699 if (((__force u32)hdr->itt & ISCSI_AGE_MASK) !=
7996a778 700 (session->age << ISCSI_AGE_SHIFT)) {
322d739d
MC		 701 iscsi_conn_printk(KERN_ERR, conn,
702 "received itt %x expected session "
703 "age (%x)\n", (__force u32)hdr->itt,
704 session->age & ISCSI_AGE_MASK);
7996a778
MC		 705 return ISCSI_ERR_BAD_ITT;
706 }
707
b4377356 708 itt = get_itt(hdr->itt);
7996a778 709 } else
b4377356 710 itt = ~0U;
7996a778
MC		 711
712 if (itt < session->cmds_max) {
713 ctask = session->cmds[itt];
714
715 if (!ctask->sc) {
322d739d
MC		 716 iscsi_conn_printk(KERN_INFO, conn, "dropping ctask "
717 "with itt 0x%x\n", ctask->itt);
7996a778
MC		 718 /* force drop */
719 return ISCSI_ERR_NO_SCSI_CMD;
720 }
721
722 if (ctask->sc->SCp.phase != session->age) {
322d739d
MC		 723 iscsi_conn_printk(KERN_ERR, conn,
724 "iscsi: ctask's session age %d, "
725 "expected %d\n", ctask->sc->SCp.phase,
726 session->age);
7996a778
MC		 727 return ISCSI_ERR_SESSION_FAILED;
728 }
729 }
730
731 *ret_itt = itt;
732 return 0;
733}
734EXPORT_SYMBOL_GPL(iscsi_verify_itt);
735
736void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
737{
738 struct iscsi_session *session = conn->session;
739 unsigned long flags;
740
741 spin_lock_irqsave(&session->lock, flags);
656cffc9
MC		 742 if (session->state == ISCSI_STATE_FAILED) {
743 spin_unlock_irqrestore(&session->lock, flags);
744 return;
745 }
746
67a61114 747 if (conn->stop_stage == 0)
7996a778
MC		 748 session->state = ISCSI_STATE_FAILED;
749 spin_unlock_irqrestore(&session->lock, flags);
750 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
751 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
752 iscsi_conn_error(conn->cls_conn, err);
753}
754EXPORT_SYMBOL_GPL(iscsi_conn_failure);
755
77a23c21
MC		 756static void iscsi_prep_mtask(struct iscsi_conn *conn,
757 struct iscsi_mgmt_task *mtask)
758{
759 struct iscsi_session *session = conn->session;
760 struct iscsi_hdr *hdr = mtask->hdr;
761 struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
762
763 if (hdr->opcode != (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) &&
764 hdr->opcode != (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
765 nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
766 /*
767 * pre-format CmdSN for outgoing PDU.
768 */
769 nop->cmdsn = cpu_to_be32(session->cmdsn);
770 if (hdr->itt != RESERVED_ITT) {
8b1d0343 771 hdr->itt = build_itt(mtask->itt, session->age);
e0726407
MC		 772 /*
773 * TODO: We always use immediate, so we never hit this.
774 * If we start to send tmfs or nops as non-immediate then
775 * we should start checking the cmdsn numbers for mgmt tasks.
776 */
77a23c21 777 if (conn->c_stage == ISCSI_CONN_STARTED &&
e0726407
MC		 778 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
779 session->queued_cmdsn++;
77a23c21 780 session->cmdsn++;
e0726407 781 }
77a23c21
MC		 782 }
783
784 if (session->tt->init_mgmt_task)
785 session->tt->init_mgmt_task(conn, mtask);
786
787 debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n",
843c0a8a
MC		 788 hdr->opcode & ISCSI_OPCODE_MASK, hdr->itt,
789 mtask->data_count);
77a23c21
MC		 790}
791
05db888a 792static int iscsi_xmit_mtask(struct iscsi_conn *conn)
b5072ea0
MC		 793{
794 struct iscsi_hdr *hdr = conn->mtask->hdr;
b3a7ea8d 795 int rc;
b5072ea0 796
b3a7ea8d
MC		 797 if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT)
798 conn->session->state = ISCSI_STATE_LOGGING_OUT;
77a23c21 799 spin_unlock_bh(&conn->session->lock);
b3a7ea8d 800
b5072ea0 801 rc = conn->session->tt->xmit_mgmt_task(conn, conn->mtask);
77a23c21 802 spin_lock_bh(&conn->session->lock);
b5072ea0
MC		 803 if (rc)
804 return rc;
805
05db888a
MC		 806 /* done with this in-progress mtask */
807 conn->mtask = NULL;
b5072ea0
MC		 808 return 0;
809}
810
77a23c21
MC		 811static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn)
812{
813 struct iscsi_session *session = conn->session;
814
815 /*
816 * Check for iSCSI window and take care of CmdSN wrap-around
817 */
e0726407
MC		 818 if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) {
819 debug_scsi("iSCSI CmdSN closed. ExpCmdSn %u MaxCmdSN %u "
820 "CmdSN %u/%u\n", session->exp_cmdsn,
821 session->max_cmdsn, session->cmdsn,
822 session->queued_cmdsn);
77a23c21
MC		 823 return -ENOSPC;
824 }
825 return 0;
826}
827
828static int iscsi_xmit_ctask(struct iscsi_conn *conn)
829{
830 struct iscsi_cmd_task *ctask = conn->ctask;
843c0a8a 831 int rc;
77a23c21
MC		 832
833 __iscsi_get_ctask(ctask);
834 spin_unlock_bh(&conn->session->lock);
835 rc = conn->session->tt->xmit_cmd_task(conn, ctask);
836 spin_lock_bh(&conn->session->lock);
837 __iscsi_put_ctask(ctask);
77a23c21
MC		 838 if (!rc)
839 /* done with this ctask */
840 conn->ctask = NULL;
841 return rc;
842}
843
843c0a8a
MC		 844/**
845 * iscsi_requeue_ctask - requeue ctask to run from session workqueue
846 * @ctask: ctask to requeue
847 *
848 * LLDs that need to run a ctask from the session workqueue should call
849 * this. The session lock must be held.
850 */
851void iscsi_requeue_ctask(struct iscsi_cmd_task *ctask)
852{
853 struct iscsi_conn *conn = ctask->conn;
854
855 list_move_tail(&ctask->running, &conn->requeue);
856 scsi_queue_work(conn->session->host, &conn->xmitwork);
857}
858EXPORT_SYMBOL_GPL(iscsi_requeue_ctask);
859
7996a778
MC		 860/**
861 * iscsi_data_xmit - xmit any command into the scheduled connection
862 * @conn: iscsi connection
863 *
864 * Notes:
865 * The function can return -EAGAIN in which case the caller must
866 * re-schedule it again later or recover. '0' return code means
867 * successful xmit.
868 **/
869static int iscsi_data_xmit(struct iscsi_conn *conn)
870{
3219e529 871 int rc = 0;
7996a778 872
77a23c21 873 spin_lock_bh(&conn->session->lock);
7996a778
MC		 874 if (unlikely(conn->suspend_tx)) {
875 debug_scsi("conn %d Tx suspended!\n", conn->id);
77a23c21 876 spin_unlock_bh(&conn->session->lock);
3219e529 877 return -ENODATA;
7996a778 878 }
7996a778
MC		 879
880 if (conn->ctask) {
77a23c21 881 rc = iscsi_xmit_ctask(conn);
3219e529 882 if (rc)
7996a778 883 goto again;
7996a778 884 }
77a23c21 885
7996a778 886 if (conn->mtask) {
05db888a 887 rc = iscsi_xmit_mtask(conn);
3219e529 888 if (rc)
7996a778 889 goto again;
7996a778
MC		 890 }
891
77a23c21
MC		 892 /*
893 * process mgmt pdus like nops before commands since we should
894 * only have one nop-out as a ping from us and targets should not
895 * overflow us with nop-ins
896 */
897check_mgmt:
843c0a8a
MC		 898 while (!list_empty(&conn->mgmtqueue)) {
899 conn->mtask = list_entry(conn->mgmtqueue.next,
900 struct iscsi_mgmt_task, running);
b3a7ea8d
MC		 901 if (conn->session->state == ISCSI_STATE_LOGGING_OUT) {
902 iscsi_free_mgmt_task(conn, conn->mtask);
903 conn->mtask = NULL;
904 continue;
905 }
906
77a23c21 907 iscsi_prep_mtask(conn, conn->mtask);
843c0a8a 908 list_move_tail(conn->mgmtqueue.next, &conn->mgmt_run_list);
77a23c21
MC		 909 rc = iscsi_xmit_mtask(conn);
910 if (rc)
911 goto again;
7996a778
MC		 912 }
913
843c0a8a 914 /* process pending command queue */
b6c395ed 915 while (!list_empty(&conn->xmitqueue)) {
843c0a8a
MC		 916 if (conn->tmf_state == TMF_QUEUED)
917 break;
918
b6c395ed
MC		 919 conn->ctask = list_entry(conn->xmitqueue.next,
920 struct iscsi_cmd_task, running);
b3a7ea8d 921 if (conn->session->state == ISCSI_STATE_LOGGING_OUT) {
9000bcd6 922 fail_command(conn, conn->ctask, DID_IMM_RETRY << 16);
b3a7ea8d
MC		 923 continue;
924 }
004d6530
BH		 925 if (iscsi_prep_scsi_cmd_pdu(conn->ctask)) {
926 fail_command(conn, conn->ctask, DID_ABORT << 16);
927 continue;
928 }
a8ac6311 929
843c0a8a 930 conn->ctask->state = ISCSI_TASK_RUNNING;
b6c395ed 931 list_move_tail(conn->xmitqueue.next, &conn->run_list);
77a23c21
MC		 932 rc = iscsi_xmit_ctask(conn);
933 if (rc)
60ecebf5 934 goto again;
77a23c21
MC		 935 /*
936 * we could continuously get new ctask requests so
937 * we need to check the mgmt queue for nops that need to
938 * be sent to aviod starvation
939 */
843c0a8a
MC		 940 if (!list_empty(&conn->mgmtqueue))
941 goto check_mgmt;
942 }
943
944 while (!list_empty(&conn->requeue)) {
945 if (conn->session->fast_abort && conn->tmf_state != TMF_INITIAL)
946 break;
947
b3a7ea8d
MC		 948 /*
949 * we always do fastlogout - conn stop code will clean up.
950 */
951 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
952 break;
953
843c0a8a
MC		 954 conn->ctask = list_entry(conn->requeue.next,
955 struct iscsi_cmd_task, running);
956 conn->ctask->state = ISCSI_TASK_RUNNING;
957 list_move_tail(conn->requeue.next, &conn->run_list);
958 rc = iscsi_xmit_ctask(conn);
959 if (rc)
960 goto again;
961 if (!list_empty(&conn->mgmtqueue))
77a23c21 962 goto check_mgmt;
7996a778 963 }
b6c395ed 964 spin_unlock_bh(&conn->session->lock);
3219e529 965 return -ENODATA;
7996a778
MC		 966
967again:
968 if (unlikely(conn->suspend_tx))
77a23c21
MC		 969 rc = -ENODATA;
970 spin_unlock_bh(&conn->session->lock);
3219e529 971 return rc;
7996a778
MC		 972}
973
c4028958 974static void iscsi_xmitworker(struct work_struct *work)
7996a778 975{
c4028958
DH		 976 struct iscsi_conn *conn =
977 container_of(work, struct iscsi_conn, xmitwork);
3219e529 978 int rc;
7996a778
MC		 979 /*
980 * serialize Xmit worker on a per-connection basis.
981 */
3219e529
MC		 982 do {
983 rc = iscsi_data_xmit(conn);
984 } while (rc >= 0 || rc == -EAGAIN);
7996a778
MC		 985}
986
987enum {
988 FAILURE_BAD_HOST = 1,
989 FAILURE_SESSION_FAILED,
990 FAILURE_SESSION_FREED,
991 FAILURE_WINDOW_CLOSED,
60ecebf5 992 FAILURE_OOM,
7996a778 993 FAILURE_SESSION_TERMINATE,
656cffc9 994 FAILURE_SESSION_IN_RECOVERY,
7996a778 995 FAILURE_SESSION_RECOVERY_TIMEOUT,
b3a7ea8d 996 FAILURE_SESSION_LOGGING_OUT,
6eabafbe 997 FAILURE_SESSION_NOT_READY,
7996a778
MC		 998};
999
1000int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
1001{
1002 struct Scsi_Host *host;
1003 int reason = 0;
1004 struct iscsi_session *session;
1005 struct iscsi_conn *conn;
1006 struct iscsi_cmd_task *ctask = NULL;
1007
1008 sc->scsi_done = done;
1009 sc->result = 0;
f47f2cf5 1010 sc->SCp.ptr = NULL;
7996a778
MC		 1011
1012 host = sc->device->host;
1040c99d 1013 spin_unlock(host->host_lock);
7996a778 1014
1040c99d 1015 session = iscsi_hostdata(host->hostdata);
7996a778
MC		 1016 spin_lock(&session->lock);
1017
6eabafbe
MC		 1018 reason = iscsi_session_chkready(session_to_cls(session));
1019 if (reason) {
1020 sc->result = reason;
1021 goto fault;
1022 }
1023
656cffc9
MC		 1024 /*
1025 * ISCSI_STATE_FAILED is a temp. state. The recovery
1026 * code will decide what is best to do with command queued
1027 * during this time
1028 */
1029 if (session->state != ISCSI_STATE_LOGGED_IN &&
1030 session->state != ISCSI_STATE_FAILED) {
1031 /*
1032 * to handle the race between when we set the recovery state
1033 * and block the session we requeue here (commands could
1034 * be entering our queuecommand while a block is starting
1035 * up because the block code is not locked)
1036 */
9000bcd6
MC		 1037 switch (session->state) {
1038 case ISCSI_STATE_IN_RECOVERY:
656cffc9 1039 reason = FAILURE_SESSION_IN_RECOVERY;
6eabafbe
MC		 1040 sc->result = DID_IMM_RETRY << 16;
1041 break;
9000bcd6
MC		 1042 case ISCSI_STATE_LOGGING_OUT:
1043 reason = FAILURE_SESSION_LOGGING_OUT;
6eabafbe
MC		 1044 sc->result = DID_IMM_RETRY << 16;
1045 break;
b3a7ea8d 1046 case ISCSI_STATE_RECOVERY_FAILED:
656cffc9 1047 reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
6eabafbe 1048 sc->result = DID_NO_CONNECT << 16;
b3a7ea8d
MC		 1049 break;
1050 case ISCSI_STATE_TERMINATE:
656cffc9 1051 reason = FAILURE_SESSION_TERMINATE;
6eabafbe 1052 sc->result = DID_NO_CONNECT << 16;
b3a7ea8d 1053 break;
b3a7ea8d 1054 default:
656cffc9 1055 reason = FAILURE_SESSION_FREED;
6eabafbe 1056 sc->result = DID_NO_CONNECT << 16;
b3a7ea8d 1057 }
7996a778
MC		 1058 goto fault;
1059 }
1060
7996a778 1061 conn = session->leadconn;
98644047
MC		 1062 if (!conn) {
1063 reason = FAILURE_SESSION_FREED;
6eabafbe 1064 sc->result = DID_NO_CONNECT << 16;
98644047
MC		 1065 goto fault;
1066 }
7996a778 1067
77a23c21
MC		 1068 if (iscsi_check_cmdsn_window_closed(conn)) {
1069 reason = FAILURE_WINDOW_CLOSED;
1070 goto reject;
1071 }
1072
60ecebf5
MC		 1073 if (!__kfifo_get(session->cmdpool.queue, (void*)&ctask,
1074 sizeof(void*))) {
1075 reason = FAILURE_OOM;
1076 goto reject;
1077 }
e0726407
MC		 1078 session->queued_cmdsn++;
1079
7996a778
MC		 1080 sc->SCp.phase = session->age;
1081 sc->SCp.ptr = (char *)ctask;
1082
60ecebf5 1083 atomic_set(&ctask->refcount, 1);
b6c395ed 1084 ctask->state = ISCSI_TASK_PENDING;
7996a778
MC		 1085 ctask->conn = conn;
1086 ctask->sc = sc;
1087 INIT_LIST_HEAD(&ctask->running);
7996a778 1088
b6c395ed 1089 list_add_tail(&ctask->running, &conn->xmitqueue);
7996a778
MC		 1090 spin_unlock(&session->lock);
1091
1092 scsi_queue_work(host, &conn->xmitwork);
1040c99d 1093 spin_lock(host->host_lock);
7996a778
MC		 1094 return 0;
1095
1096reject:
1097 spin_unlock(&session->lock);
1098 debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason);
1040c99d 1099 spin_lock(host->host_lock);
7996a778
MC		 1100 return SCSI_MLQUEUE_HOST_BUSY;
1101
1102fault:
1103 spin_unlock(&session->lock);
6eabafbe 1104 debug_scsi("iscsi: cmd 0x%x is not queued (%d)\n", sc->cmnd[0], reason);
1c138991 1105 scsi_set_resid(sc, scsi_bufflen(sc));
7996a778 1106 sc->scsi_done(sc);
1040c99d 1107 spin_lock(host->host_lock);
7996a778
MC		 1108 return 0;
1109}
1110EXPORT_SYMBOL_GPL(iscsi_queuecommand);
1111
1112int iscsi_change_queue_depth(struct scsi_device *sdev, int depth)
1113{
1114 if (depth > ISCSI_MAX_CMD_PER_LUN)
1115 depth = ISCSI_MAX_CMD_PER_LUN;
1116 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
1117 return sdev->queue_depth;
1118}
1119EXPORT_SYMBOL_GPL(iscsi_change_queue_depth);
1120
7996a778
MC		 1121void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
1122{
1123 struct iscsi_session *session = class_to_transport_session(cls_session);
7996a778
MC		 1124
1125 spin_lock_bh(&session->lock);
1126 if (session->state != ISCSI_STATE_LOGGED_IN) {
656cffc9 1127 session->state = ISCSI_STATE_RECOVERY_FAILED;
843c0a8a
MC		 1128 if (session->leadconn)
1129 wake_up(&session->leadconn->ehwait);
7996a778
MC		 1130 }
1131 spin_unlock_bh(&session->lock);
1132}
1133EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
1134
1135int iscsi_eh_host_reset(struct scsi_cmnd *sc)
1136{
1137 struct Scsi_Host *host = sc->device->host;
1138 struct iscsi_session *session = iscsi_hostdata(host->hostdata);
1139 struct iscsi_conn *conn = session->leadconn;
7996a778 1140
bc436b27 1141 mutex_lock(&session->eh_mutex);
7996a778
MC		 1142 spin_lock_bh(&session->lock);
1143 if (session->state == ISCSI_STATE_TERMINATE) {
1144failed:
1145 debug_scsi("failing host reset: session terminated "
d6e24d1c 1146 "[CID %d age %d]\n", conn->id, session->age);
7996a778 1147 spin_unlock_bh(&session->lock);
bc436b27 1148 mutex_unlock(&session->eh_mutex);
7996a778
MC		 1149 return FAILED;
1150 }
1151
7996a778 1152 spin_unlock_bh(&session->lock);
bc436b27 1153 mutex_unlock(&session->eh_mutex);
7996a778
MC		 1154 /*
1155 * we drop the lock here but the leadconn cannot be destoyed while
1156 * we are in the scsi eh
1157 */
843c0a8a 1158 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
7996a778
MC		 1159
1160 debug_scsi("iscsi_eh_host_reset wait for relogin\n");
1161 wait_event_interruptible(conn->ehwait,
1162 session->state == ISCSI_STATE_TERMINATE ||
1163 session->state == ISCSI_STATE_LOGGED_IN ||
656cffc9 1164 session->state == ISCSI_STATE_RECOVERY_FAILED);
7996a778
MC		 1165 if (signal_pending(current))
1166 flush_signals(current);
1167
bc436b27 1168 mutex_lock(&session->eh_mutex);
7996a778
MC		 1169 spin_lock_bh(&session->lock);
1170 if (session->state == ISCSI_STATE_LOGGED_IN)
322d739d
MC		 1171 iscsi_session_printk(KERN_INFO, session,
1172 "host reset succeeded\n");
7996a778
MC		 1173 else
1174 goto failed;
1175 spin_unlock_bh(&session->lock);
bc436b27 1176 mutex_unlock(&session->eh_mutex);
7996a778
MC		 1177 return SUCCESS;
1178}
1179EXPORT_SYMBOL_GPL(iscsi_eh_host_reset);
1180
843c0a8a 1181static void iscsi_tmf_timedout(unsigned long data)
7996a778 1182{
843c0a8a 1183 struct iscsi_conn *conn = (struct iscsi_conn *)data;
7996a778
MC		 1184 struct iscsi_session *session = conn->session;
1185
1186 spin_lock(&session->lock);
843c0a8a
MC		 1187 if (conn->tmf_state == TMF_QUEUED) {
1188 conn->tmf_state = TMF_TIMEDOUT;
1189 debug_scsi("tmf timedout\n");
7996a778
MC		 1190 /* unblock eh_abort() */
1191 wake_up(&conn->ehwait);
1192 }
1193 spin_unlock(&session->lock);
1194}
1195
843c0a8a 1196static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn,
f6d5180c
MC		 1197 struct iscsi_tm *hdr, int age,
1198 int timeout)
7996a778 1199{
7996a778 1200 struct iscsi_session *session = conn->session;
843c0a8a 1201 struct iscsi_mgmt_task *mtask;
7996a778 1202
843c0a8a
MC		 1203 mtask = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr,
1204 NULL, 0);
1205 if (!mtask) {
6724add1 1206 spin_unlock_bh(&session->lock);
7996a778 1207 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
843c0a8a
MC		 1208 spin_lock_bh(&session->lock);
1209 debug_scsi("tmf exec failure\n");
77a23c21 1210 return -EPERM;
7996a778 1211 }
843c0a8a 1212 conn->tmfcmd_pdus_cnt++;
f6d5180c 1213 conn->tmf_timer.expires = timeout * HZ + jiffies;
843c0a8a
MC		 1214 conn->tmf_timer.function = iscsi_tmf_timedout;
1215 conn->tmf_timer.data = (unsigned long)conn;
1216 add_timer(&conn->tmf_timer);
1217 debug_scsi("tmf set timeout\n");
7996a778 1218
7996a778 1219 spin_unlock_bh(&session->lock);
6724add1 1220 mutex_unlock(&session->eh_mutex);
77a23c21 1221 scsi_queue_work(session->host, &conn->xmitwork);
7996a778
MC		 1222
1223 /*
1224 * block eh thread until:
1225 *
843c0a8a
MC		 1226 * 1) tmf response
1227 * 2) tmf timeout
7996a778
MC		 1228 * 3) session is terminated or restarted or userspace has
1229 * given up on recovery
1230 */
843c0a8a 1231 wait_event_interruptible(conn->ehwait, age != session->age ||
7996a778 1232 session->state != ISCSI_STATE_LOGGED_IN ||
843c0a8a 1233 conn->tmf_state != TMF_QUEUED);
7996a778
MC		 1234 if (signal_pending(current))
1235 flush_signals(current);
843c0a8a
MC		 1236 del_timer_sync(&conn->tmf_timer);
1237
6724add1 1238 mutex_lock(&session->eh_mutex);
77a23c21 1239 spin_lock_bh(&session->lock);
843c0a8a
MC		 1240 /* if the session drops it will clean up the mtask */
1241 if (age != session->age ||
1242 session->state != ISCSI_STATE_LOGGED_IN)
1243 return -ENOTCONN;
7996a778
MC		 1244 return 0;
1245}
1246
843c0a8a
MC		 1247/*
1248 * Fail commands. session lock held and recv side suspended and xmit
1249 * thread flushed
1250 */
6eabafbe
MC		 1251static void fail_all_commands(struct iscsi_conn *conn, unsigned lun,
1252 int error)
843c0a8a
MC		 1253{
1254 struct iscsi_cmd_task *ctask, *tmp;
1255
1256 if (conn->ctask && (conn->ctask->sc->device->lun == lun || lun == -1))
1257 conn->ctask = NULL;
1258
1259 /* flush pending */
1260 list_for_each_entry_safe(ctask, tmp, &conn->xmitqueue, running) {
1261 if (lun == ctask->sc->device->lun || lun == -1) {
1262 debug_scsi("failing pending sc %p itt 0x%x\n",
1263 ctask->sc, ctask->itt);
6eabafbe 1264 fail_command(conn, ctask, error << 16);
843c0a8a
MC		 1265 }
1266 }
1267
1268 list_for_each_entry_safe(ctask, tmp, &conn->requeue, running) {
1269 if (lun == ctask->sc->device->lun || lun == -1) {
1270 debug_scsi("failing requeued sc %p itt 0x%x\n",
1271 ctask->sc, ctask->itt);
6eabafbe 1272 fail_command(conn, ctask, error << 16);
843c0a8a
MC		 1273 }
1274 }
1275
1276 /* fail all other running */
1277 list_for_each_entry_safe(ctask, tmp, &conn->run_list, running) {
1278 if (lun == ctask->sc->device->lun || lun == -1) {
1279 debug_scsi("failing in progress sc %p itt 0x%x\n",
1280 ctask->sc, ctask->itt);
1281 fail_command(conn, ctask, DID_BUS_BUSY << 16);
1282 }
1283 }
1284}
1285
6724add1
MC		 1286static void iscsi_suspend_tx(struct iscsi_conn *conn)
1287{
1288 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1289 scsi_flush_work(conn->session->host);
1290}
1291
1292static void iscsi_start_tx(struct iscsi_conn *conn)
1293{
1294 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1295 scsi_queue_work(conn->session->host, &conn->xmitwork);
1296}
1297
f6d5180c
MC		 1298static enum scsi_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *scmd)
1299{
1300 struct iscsi_cls_session *cls_session;
1301 struct iscsi_session *session;
1302 struct iscsi_conn *conn;
1303 enum scsi_eh_timer_return rc = EH_NOT_HANDLED;
1304
1305 cls_session = starget_to_session(scsi_target(scmd->device));
1306 session = class_to_transport_session(cls_session);
1307
1308 debug_scsi("scsi cmd %p timedout\n", scmd);
1309
1310 spin_lock(&session->lock);
1311 if (session->state != ISCSI_STATE_LOGGED_IN) {
1312 /*
1313 * We are probably in the middle of iscsi recovery so let
1314 * that complete and handle the error.
1315 */
1316 rc = EH_RESET_TIMER;
1317 goto done;
1318 }
1319
1320 conn = session->leadconn;
1321 if (!conn) {
1322 /* In the middle of shuting down */
1323 rc = EH_RESET_TIMER;
1324 goto done;
1325 }
1326
1327 if (!conn->recv_timeout && !conn->ping_timeout)
1328 goto done;
1329 /*
1330 * if the ping timedout then we are in the middle of cleaning up
1331 * and can let the iscsi eh handle it
1332 */
1333 if (time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) +
1334 (conn->ping_timeout * HZ), jiffies))
1335 rc = EH_RESET_TIMER;
1336 /*
1337 * if we are about to check the transport then give the command
1338 * more time
1339 */
1340 if (time_before_eq(conn->last_recv + (conn->recv_timeout * HZ),
1341 jiffies))
1342 rc = EH_RESET_TIMER;
1343 /* if in the middle of checking the transport then give us more time */
1344 if (conn->ping_mtask)
1345 rc = EH_RESET_TIMER;
1346done:
1347 spin_unlock(&session->lock);
1348 debug_scsi("return %s\n", rc == EH_RESET_TIMER ? "timer reset" : "nh");
1349 return rc;
1350}
1351
1352static void iscsi_check_transport_timeouts(unsigned long data)
1353{
1354 struct iscsi_conn *conn = (struct iscsi_conn *)data;
1355 struct iscsi_session *session = conn->session;
1356 unsigned long timeout, next_timeout = 0, last_recv;
1357
1358 spin_lock(&session->lock);
1359 if (session->state != ISCSI_STATE_LOGGED_IN)
1360 goto done;
1361
1362 timeout = conn->recv_timeout;
1363 if (!timeout)
1364 goto done;
1365
1366 timeout *= HZ;
1367 last_recv = conn->last_recv;
1368 if (time_before_eq(last_recv + timeout + (conn->ping_timeout * HZ),
1369 jiffies)) {
322d739d
MC		 1370 iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs "
1371 "expired, last rx %lu, last ping %lu, "
1372 "now %lu\n", conn->ping_timeout, last_recv,
1373 conn->last_ping, jiffies);
f6d5180c
MC		 1374 spin_unlock(&session->lock);
1375 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1376 return;
1377 }
1378
1379 if (time_before_eq(last_recv + timeout, jiffies)) {
1380 if (time_before_eq(conn->last_ping, last_recv)) {
1381 /* send a ping to try to provoke some traffic */
1382 debug_scsi("Sending nopout as ping on conn %p\n", conn);
1383 iscsi_send_nopout(conn, NULL);
1384 }
1385 next_timeout = last_recv + timeout + (conn->ping_timeout * HZ);
ad294e9c 1386 } else
f6d5180c 1387 next_timeout = last_recv + timeout;
f6d5180c 1388
ad294e9c
MC		 1389 debug_scsi("Setting next tmo %lu\n", next_timeout);
1390 mod_timer(&conn->transport_timer, next_timeout);
f6d5180c
MC		 1391done:
1392 spin_unlock(&session->lock);
1393}
1394
843c0a8a
MC		 1395static void iscsi_prep_abort_task_pdu(struct iscsi_cmd_task *ctask,
1396 struct iscsi_tm *hdr)
1397{
1398 memset(hdr, 0, sizeof(*hdr));
1399 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
1400 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK;
1401 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
1402 memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
1403 hdr->rtt = ctask->hdr->itt;
1404 hdr->refcmdsn = ctask->hdr->cmdsn;
1405}
1406
7996a778
MC		 1407int iscsi_eh_abort(struct scsi_cmnd *sc)
1408{
6724add1
MC		 1409 struct Scsi_Host *host = sc->device->host;
1410 struct iscsi_session *session = iscsi_hostdata(host->hostdata);
f47f2cf5 1411 struct iscsi_conn *conn;
843c0a8a
MC		 1412 struct iscsi_cmd_task *ctask;
1413 struct iscsi_tm *hdr;
1414 int rc, age;
7996a778 1415
6724add1
MC		 1416 mutex_lock(&session->eh_mutex);
1417 spin_lock_bh(&session->lock);
f47f2cf5
MC		 1418 /*
1419 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
1420 * got the command.
1421 */
1422 if (!sc->SCp.ptr) {
1423 debug_scsi("sc never reached iscsi layer or it completed.\n");
6724add1
MC		 1424 spin_unlock_bh(&session->lock);
1425 mutex_unlock(&session->eh_mutex);
f47f2cf5
MC		 1426 return SUCCESS;
1427 }
1428
7996a778
MC		 1429 /*
1430 * If we are not logged in or we have started a new session
1431 * then let the host reset code handle this
1432 */
843c0a8a
MC		 1433 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN ||
1434 sc->SCp.phase != session->age) {
1435 spin_unlock_bh(&session->lock);
1436 mutex_unlock(&session->eh_mutex);
1437 return FAILED;
1438 }
1439
1440 conn = session->leadconn;
1441 conn->eh_abort_cnt++;
1442 age = session->age;
1443
1444 ctask = (struct iscsi_cmd_task *)sc->SCp.ptr;
1445 debug_scsi("aborting [sc %p itt 0x%x]\n", sc, ctask->itt);
7996a778
MC		 1446
1447 /* ctask completed before time out */
7ea8b828 1448 if (!ctask->sc) {
7ea8b828 1449 debug_scsi("sc completed while abort in progress\n");
77a23c21 1450 goto success;
7ea8b828 1451 }
7996a778 1452
77a23c21
MC		 1453 if (ctask->state == ISCSI_TASK_PENDING) {
1454 fail_command(conn, ctask, DID_ABORT << 16);
1455 goto success;
1456 }
7996a778 1457
843c0a8a
MC		 1458 /* only have one tmf outstanding at a time */
1459 if (conn->tmf_state != TMF_INITIAL)
7996a778 1460 goto failed;
843c0a8a 1461 conn->tmf_state = TMF_QUEUED;
7996a778 1462
843c0a8a
MC		 1463 hdr = &conn->tmhdr;
1464 iscsi_prep_abort_task_pdu(ctask, hdr);
1465
f6d5180c 1466 if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout)) {
843c0a8a
MC		 1467 rc = FAILED;
1468 goto failed;
1469 }
1470
1471 switch (conn->tmf_state) {
1472 case TMF_SUCCESS:
77a23c21 1473 spin_unlock_bh(&session->lock);
6724add1 1474 iscsi_suspend_tx(conn);
77a23c21
MC		 1475 /*
1476 * clean up task if aborted. grab the recv lock as a writer
1477 */
1478 write_lock_bh(conn->recv_lock);
1479 spin_lock(&session->lock);
1480 fail_command(conn, ctask, DID_ABORT << 16);
843c0a8a 1481 conn->tmf_state = TMF_INITIAL;
77a23c21
MC		 1482 spin_unlock(&session->lock);
1483 write_unlock_bh(conn->recv_lock);
6724add1 1484 iscsi_start_tx(conn);
77a23c21 1485 goto success_unlocked;
843c0a8a
MC		 1486 case TMF_TIMEDOUT:
1487 spin_unlock_bh(&session->lock);
1488 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1489 goto failed_unlocked;
1490 case TMF_NOT_FOUND:
1491 if (!sc->SCp.ptr) {
1492 conn->tmf_state = TMF_INITIAL;
7ea8b828 1493 /* ctask completed before tmf abort response */
7ea8b828 1494 debug_scsi("sc completed while abort in progress\n");
77a23c21 1495 goto success;
7ea8b828
MC		 1496 }
1497 /* fall through */
1498 default:
843c0a8a
MC		 1499 conn->tmf_state = TMF_INITIAL;
1500 goto failed;
7996a778
MC		 1501 }
1502
77a23c21 1503success:
7996a778 1504 spin_unlock_bh(&session->lock);
77a23c21
MC		 1505success_unlocked:
1506 debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
6724add1 1507 mutex_unlock(&session->eh_mutex);
7996a778
MC		 1508 return SUCCESS;
1509
1510failed:
1511 spin_unlock_bh(&session->lock);
77a23c21 1512failed_unlocked:
843c0a8a
MC		 1513 debug_scsi("abort failed [sc %p itt 0x%x]\n", sc,
1514 ctask ? ctask->itt : 0);
6724add1 1515 mutex_unlock(&session->eh_mutex);
7996a778
MC		 1516 return FAILED;
1517}
1518EXPORT_SYMBOL_GPL(iscsi_eh_abort);
1519
843c0a8a
MC		 1520static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
1521{
1522 memset(hdr, 0, sizeof(*hdr));
1523 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
1524 hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK;
1525 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
1526 int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun);
f6d5180c 1527 hdr->rtt = RESERVED_ITT;
843c0a8a
MC		 1528}
1529
1530int iscsi_eh_device_reset(struct scsi_cmnd *sc)
1531{
1532 struct Scsi_Host *host = sc->device->host;
1533 struct iscsi_session *session = iscsi_hostdata(host->hostdata);
1534 struct iscsi_conn *conn;
1535 struct iscsi_tm *hdr;
1536 int rc = FAILED;
1537
1538 debug_scsi("LU Reset [sc %p lun %u]\n", sc, sc->device->lun);
1539
1540 mutex_lock(&session->eh_mutex);
1541 spin_lock_bh(&session->lock);
1542 /*
1543 * Just check if we are not logged in. We cannot check for
1544 * the phase because the reset could come from a ioctl.
1545 */
1546 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
1547 goto unlock;
1548 conn = session->leadconn;
1549
1550 /* only have one tmf outstanding at a time */
1551 if (conn->tmf_state != TMF_INITIAL)
1552 goto unlock;
1553 conn->tmf_state = TMF_QUEUED;
1554
1555 hdr = &conn->tmhdr;
1556 iscsi_prep_lun_reset_pdu(sc, hdr);
1557
f6d5180c
MC		 1558 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
1559 session->lu_reset_timeout)) {
843c0a8a
MC		 1560 rc = FAILED;
1561 goto unlock;
1562 }
1563
1564 switch (conn->tmf_state) {
1565 case TMF_SUCCESS:
1566 break;
1567 case TMF_TIMEDOUT:
1568 spin_unlock_bh(&session->lock);
1569 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1570 goto done;
1571 default:
1572 conn->tmf_state = TMF_INITIAL;
1573 goto unlock;
1574 }
1575
1576 rc = SUCCESS;
1577 spin_unlock_bh(&session->lock);
1578
1579 iscsi_suspend_tx(conn);
1580 /* need to grab the recv lock then session lock */
1581 write_lock_bh(conn->recv_lock);
1582 spin_lock(&session->lock);
6eabafbe 1583 fail_all_commands(conn, sc->device->lun, DID_ERROR);
843c0a8a
MC		 1584 conn->tmf_state = TMF_INITIAL;
1585 spin_unlock(&session->lock);
1586 write_unlock_bh(conn->recv_lock);
1587
1588 iscsi_start_tx(conn);
1589 goto done;
1590
1591unlock:
1592 spin_unlock_bh(&session->lock);
1593done:
1594 debug_scsi("iscsi_eh_device_reset %s\n",
1595 rc == SUCCESS ? "SUCCESS" : "FAILED");
1596 mutex_unlock(&session->eh_mutex);
1597 return rc;
1598}
1599EXPORT_SYMBOL_GPL(iscsi_eh_device_reset);
1600
6320377f
OK		 1601/*
1602 * Pre-allocate a pool of @max items of @item_size. By default, the pool
1603 * should be accessed via kfifo_{get,put} on q->queue.
1604 * Optionally, the caller can obtain the array of object pointers
1605 * by passing in a non-NULL @items pointer
1606 */
7996a778 1607int
6320377f 1608iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size)
7996a778 1609{
6320377f 1610 int i, num_arrays = 1;
7996a778 1611
6320377f 1612 memset(q, 0, sizeof(*q));
7996a778
MC		 1613
1614 q->max = max;
6320377f
OK		 1615
1616 /* If the user passed an items pointer, he wants a copy of
1617 * the array. */
1618 if (items)
1619 num_arrays++;
1620 q->pool = kzalloc(num_arrays * max * sizeof(void*), GFP_KERNEL);
1621 if (q->pool == NULL)
1622 goto enomem;
7996a778
MC		 1623
1624 q->queue = kfifo_init((void*)q->pool, max * sizeof(void*),
1625 GFP_KERNEL, NULL);
6320377f
OK		 1626 if (q->queue == ERR_PTR(-ENOMEM))
1627 goto enomem;
7996a778
MC		 1628
1629 for (i = 0; i < max; i++) {
6320377f 1630 q->pool[i] = kzalloc(item_size, GFP_KERNEL);
7996a778 1631 if (q->pool[i] == NULL) {
6320377f
OK		 1632 q->max = i;
1633 goto enomem;
7996a778 1634 }
7996a778
MC		 1635 __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*));
1636 }
6320377f
OK		 1637
1638 if (items) {
1639 *items = q->pool + max;
1640 memcpy(*items, q->pool, max * sizeof(void *));
1641 }
1642
7996a778 1643 return 0;
6320377f
OK		 1644
1645enomem:
1646 iscsi_pool_free(q);
1647 return -ENOMEM;
7996a778
MC		 1648}
1649EXPORT_SYMBOL_GPL(iscsi_pool_init);
1650
6320377f 1651void iscsi_pool_free(struct iscsi_pool *q)
7996a778
MC		 1652{
1653 int i;
1654
1655 for (i = 0; i < q->max; i++)
6320377f
OK		 1656 kfree(q->pool[i]);
1657 if (q->pool)
1658 kfree(q->pool);
7996a778
MC		 1659}
1660EXPORT_SYMBOL_GPL(iscsi_pool_free);
1661
1662/*
1663 * iSCSI Session's hostdata organization:
1664 *
1665 * *------------------* <== hostdata_session(host->hostdata)
1666 * | ptr to class sess|
1667 * |------------------| <== iscsi_hostdata(host->hostdata)
1668 * | iscsi_session |
1669 * *------------------*
1670 */
1671
1672#define hostdata_privsize(_sz) (sizeof(unsigned long) + _sz + \
1673 _sz % sizeof(unsigned long))
1674
1675#define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata))
1676
1677/**
1678 * iscsi_session_setup - create iscsi cls session and host and session
1679 * @scsit: scsi transport template
1680 * @iscsit: iscsi transport template
1548271e
MC		 1681 * @cmds_max: scsi host can queue
1682 * @qdepth: scsi host cmds per lun
1683 * @cmd_task_size: LLD ctask private data size
1684 * @mgmt_task_size: LLD mtask private data size
7996a778
MC		 1685 * @initial_cmdsn: initial CmdSN
1686 * @hostno: host no allocated
1687 *
1688 * This can be used by software iscsi_transports that allocate
1689 * a session per scsi host.
1690 **/
1691struct iscsi_cls_session *
1692iscsi_session_setup(struct iscsi_transport *iscsit,
1693 struct scsi_transport_template *scsit,
1548271e 1694 uint16_t cmds_max, uint16_t qdepth,
7996a778
MC		 1695 int cmd_task_size, int mgmt_task_size,
1696 uint32_t initial_cmdsn, uint32_t *hostno)
1697{
1698 struct Scsi_Host *shost;
1699 struct iscsi_session *session;
1700 struct iscsi_cls_session *cls_session;
1701 int cmd_i;
1702
1548271e
MC		 1703 if (qdepth > ISCSI_MAX_CMD_PER_LUN || qdepth < 1) {
1704 if (qdepth != 0)
1705 printk(KERN_ERR "iscsi: invalid queue depth of %d. "
1706 "Queue depth must be between 1 and %d.\n",
1707 qdepth, ISCSI_MAX_CMD_PER_LUN);
1708 qdepth = ISCSI_DEF_CMD_PER_LUN;
1709 }
1710
31ed0bf4
MC		 1711 if (!is_power_of_2(cmds_max) || cmds_max >= ISCSI_MGMT_ITT_OFFSET ||
1712 cmds_max < 2) {
1548271e
MC		 1713 if (cmds_max != 0)
1714 printk(KERN_ERR "iscsi: invalid can_queue of %d. "
1715 "can_queue must be a power of 2 and between "
1716 "2 and %d - setting to %d.\n", cmds_max,
1717 ISCSI_MGMT_ITT_OFFSET, ISCSI_DEF_XMIT_CMDS_MAX);
1718 cmds_max = ISCSI_DEF_XMIT_CMDS_MAX;
1719 }
1720
7996a778
MC		 1721 shost = scsi_host_alloc(iscsit->host_template,
1722 hostdata_privsize(sizeof(*session)));
1723 if (!shost)
1724 return NULL;
1725
1548271e
MC		 1726 /* the iscsi layer takes one task for reserve */
1727 shost->can_queue = cmds_max - 1;
1728 shost->cmd_per_lun = qdepth;
7996a778
MC		 1729 shost->max_id = 1;
1730 shost->max_channel = 0;
1731 shost->max_lun = iscsit->max_lun;
1732 shost->max_cmd_len = iscsit->max_cmd_len;
1733 shost->transportt = scsit;
1734 shost->transportt->create_work_queue = 1;
f6d5180c 1735 shost->transportt->eh_timed_out = iscsi_eh_cmd_timed_out;
7996a778
MC		 1736 *hostno = shost->host_no;
1737
1738 session = iscsi_hostdata(shost->hostdata);
1739 memset(session, 0, sizeof(struct iscsi_session));
1740 session->host = shost;
1741 session->state = ISCSI_STATE_FREE;
f6d5180c 1742 session->fast_abort = 1;
4cd49ea1
MC		 1743 session->lu_reset_timeout = 15;
1744 session->abort_timeout = 10;
7996a778 1745 session->mgmtpool_max = ISCSI_MGMT_CMDS_MAX;
1548271e 1746 session->cmds_max = cmds_max;
e0726407 1747 session->queued_cmdsn = session->cmdsn = initial_cmdsn;
7996a778
MC		 1748 session->exp_cmdsn = initial_cmdsn + 1;
1749 session->max_cmdsn = initial_cmdsn + 1;
1750 session->max_r2t = 1;
1751 session->tt = iscsit;
6724add1 1752 mutex_init(&session->eh_mutex);
7996a778
MC		 1753
1754 /* initialize SCSI PDU commands pool */
1755 if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
1756 (void***)&session->cmds,
1757 cmd_task_size + sizeof(struct iscsi_cmd_task)))
1758 goto cmdpool_alloc_fail;
1759
1760 /* pre-format cmds pool with ITT */
1761 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
1762 struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
1763
1764 if (cmd_task_size)
1765 ctask->dd_data = &ctask[1];
1766 ctask->itt = cmd_i;
b6c395ed 1767 INIT_LIST_HEAD(&ctask->running);
7996a778
MC		 1768 }
1769
1770 spin_lock_init(&session->lock);
7996a778
MC		 1771
1772 /* initialize immediate command pool */
1773 if (iscsi_pool_init(&session->mgmtpool, session->mgmtpool_max,
1774 (void***)&session->mgmt_cmds,
1775 mgmt_task_size + sizeof(struct iscsi_mgmt_task)))
1776 goto mgmtpool_alloc_fail;
1777
1778
1779 /* pre-format immediate cmds pool with ITT */
1780 for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) {
1781 struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i];
1782
1783 if (mgmt_task_size)
1784 mtask->dd_data = &mtask[1];
1785 mtask->itt = ISCSI_MGMT_ITT_OFFSET + cmd_i;
b6c395ed 1786 INIT_LIST_HEAD(&mtask->running);
7996a778
MC		 1787 }
1788
1789 if (scsi_add_host(shost, NULL))
1790 goto add_host_fail;
1791
f53a88da
MC		 1792 if (!try_module_get(iscsit->owner))
1793 goto cls_session_fail;
1794
6a8a0d36 1795 cls_session = iscsi_create_session(shost, iscsit, 0);
7996a778 1796 if (!cls_session)
f53a88da 1797 goto module_put;
7996a778
MC		 1798 *(unsigned long*)shost->hostdata = (unsigned long)cls_session;
1799
1800 return cls_session;
1801
f53a88da
MC		 1802module_put:
1803 module_put(iscsit->owner);
7996a778
MC		 1804cls_session_fail:
1805 scsi_remove_host(shost);
1806add_host_fail:
6320377f 1807 iscsi_pool_free(&session->mgmtpool);
7996a778 1808mgmtpool_alloc_fail:
6320377f 1809 iscsi_pool_free(&session->cmdpool);
7996a778
MC		 1810cmdpool_alloc_fail:
1811 scsi_host_put(shost);
1812 return NULL;
1813}
1814EXPORT_SYMBOL_GPL(iscsi_session_setup);
1815
1816/**
1817 * iscsi_session_teardown - destroy session, host, and cls_session
1818 * shost: scsi host
1819 *
1820 * This can be used by software iscsi_transports that allocate
1821 * a session per scsi host.
1822 **/
1823void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
1824{
1825 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
1826 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
63f75cc8 1827 struct module *owner = cls_session->transport->owner;
7996a778 1828
26974789 1829 iscsi_remove_session(cls_session);
7996a778
MC		 1830 scsi_remove_host(shost);
1831
6320377f
OK		 1832 iscsi_pool_free(&session->mgmtpool);
1833 iscsi_pool_free(&session->cmdpool);
7996a778 1834
b2c64167
MC		 1835 kfree(session->password);
1836 kfree(session->password_in);
1837 kfree(session->username);
1838 kfree(session->username_in);
f3ff0c36 1839 kfree(session->targetname);
d8196ed2 1840 kfree(session->netdev);
0801c242 1841 kfree(session->hwaddress);
8ad5781a 1842 kfree(session->initiatorname);
f3ff0c36 1843
26974789 1844 iscsi_free_session(cls_session);
7996a778 1845 scsi_host_put(shost);
63f75cc8 1846 module_put(owner);
7996a778
MC		 1847}
1848EXPORT_SYMBOL_GPL(iscsi_session_teardown);
1849
1850/**
1851 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
1852 * @cls_session: iscsi_cls_session
1853 * @conn_idx: cid
1854 **/
1855struct iscsi_cls_conn *
1856iscsi_conn_setup(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
1857{
1858 struct iscsi_session *session = class_to_transport_session(cls_session);
1859 struct iscsi_conn *conn;
1860 struct iscsi_cls_conn *cls_conn;
d36ab6f3 1861 char *data;
7996a778
MC		 1862
1863 cls_conn = iscsi_create_conn(cls_session, conn_idx);
1864 if (!cls_conn)
1865 return NULL;
1866 conn = cls_conn->dd_data;
1867 memset(conn, 0, sizeof(*conn));
1868
1869 conn->session = session;
1870 conn->cls_conn = cls_conn;
1871 conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
1872 conn->id = conn_idx;
1873 conn->exp_statsn = 0;
843c0a8a 1874 conn->tmf_state = TMF_INITIAL;
f6d5180c
MC		 1875
1876 init_timer(&conn->transport_timer);
1877 conn->transport_timer.data = (unsigned long)conn;
1878 conn->transport_timer.function = iscsi_check_transport_timeouts;
1879
7996a778
MC		 1880 INIT_LIST_HEAD(&conn->run_list);
1881 INIT_LIST_HEAD(&conn->mgmt_run_list);
843c0a8a 1882 INIT_LIST_HEAD(&conn->mgmtqueue);
b6c395ed 1883 INIT_LIST_HEAD(&conn->xmitqueue);
843c0a8a 1884 INIT_LIST_HEAD(&conn->requeue);
c4028958 1885 INIT_WORK(&conn->xmitwork, iscsi_xmitworker);
7996a778
MC		 1886
1887 /* allocate login_mtask used for the login/text sequences */
1888 spin_lock_bh(&session->lock);
1889 if (!__kfifo_get(session->mgmtpool.queue,
1890 (void*)&conn->login_mtask,
1891 sizeof(void*))) {
1892 spin_unlock_bh(&session->lock);
1893 goto login_mtask_alloc_fail;
1894 }
1895 spin_unlock_bh(&session->lock);
1896
bf32ed33 1897 data = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN, GFP_KERNEL);
d36ab6f3
MC		 1898 if (!data)
1899 goto login_mtask_data_alloc_fail;
c8dc1e52 1900 conn->login_mtask->data = conn->data = data;
d36ab6f3 1901
843c0a8a 1902 init_timer(&conn->tmf_timer);
7996a778
MC		 1903 init_waitqueue_head(&conn->ehwait);
1904
1905 return cls_conn;
1906
d36ab6f3
MC		 1907login_mtask_data_alloc_fail:
1908 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
1909 sizeof(void*));
7996a778 1910login_mtask_alloc_fail:
7996a778
MC		 1911 iscsi_destroy_conn(cls_conn);
1912 return NULL;
1913}
1914EXPORT_SYMBOL_GPL(iscsi_conn_setup);
1915
1916/**
1917 * iscsi_conn_teardown - teardown iscsi connection
1918 * cls_conn: iscsi class connection
1919 *
1920 * TODO: we may need to make this into a two step process
1921 * like scsi-mls remove + put host
1922 */
1923void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
1924{
1925 struct iscsi_conn *conn = cls_conn->dd_data;
1926 struct iscsi_session *session = conn->session;
1927 unsigned long flags;
1928
f6d5180c
MC		 1929 del_timer_sync(&conn->transport_timer);
1930
7996a778
MC		 1931 spin_lock_bh(&session->lock);
1932 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
1933 if (session->leadconn == conn) {
1934 /*
1935 * leading connection? then give up on recovery.
1936 */
1937 session->state = ISCSI_STATE_TERMINATE;
1938 wake_up(&conn->ehwait);
1939 }
1940 spin_unlock_bh(&session->lock);
1941
7996a778
MC		 1942 /*
1943 * Block until all in-progress commands for this connection
1944 * time out or fail.
1945 */
1946 for (;;) {
1947 spin_lock_irqsave(session->host->host_lock, flags);
1948 if (!session->host->host_busy) { /* OK for ERL == 0 */
1949 spin_unlock_irqrestore(session->host->host_lock, flags);
1950 break;
1951 }
1952 spin_unlock_irqrestore(session->host->host_lock, flags);
1953 msleep_interruptible(500);
322d739d
MC		 1954 iscsi_conn_printk(KERN_INFO, conn, "iscsi conn_destroy(): "
1955 "host_busy %d host_failed %d\n",
1956 session->host->host_busy,
1957 session->host->host_failed);
7996a778
MC		 1958 /*
1959 * force eh_abort() to unblock
1960 */
1961 wake_up(&conn->ehwait);
1962 }
1963
779ea120 1964 /* flush queued up work because we free the connection below */
843c0a8a 1965 iscsi_suspend_tx(conn);
779ea120 1966
7996a778 1967 spin_lock_bh(&session->lock);
c8dc1e52 1968 kfree(conn->data);
f3ff0c36 1969 kfree(conn->persistent_address);
7996a778
MC		 1970 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
1971 sizeof(void*));
e0726407 1972 if (session->leadconn == conn)
7996a778 1973 session->leadconn = NULL;
7996a778
MC		 1974 spin_unlock_bh(&session->lock);
1975
7996a778
MC		 1976 iscsi_destroy_conn(cls_conn);
1977}
1978EXPORT_SYMBOL_GPL(iscsi_conn_teardown);
1979
1980int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
1981{
1982 struct iscsi_conn *conn = cls_conn->dd_data;
1983 struct iscsi_session *session = conn->session;
1984
ffd0436e 1985 if (!session) {
322d739d
MC		 1986 iscsi_conn_printk(KERN_ERR, conn,
1987 "can't start unbound connection\n");
7996a778
MC		 1988 return -EPERM;
1989 }
1990
db98ccde
MC		 1991 if ((session->imm_data_en || !session->initial_r2t_en) &&
1992 session->first_burst > session->max_burst) {
322d739d
MC		 1993 iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: "
1994 "first_burst %d max_burst %d\n",
1995 session->first_burst, session->max_burst);
ffd0436e
MC		 1996 return -EINVAL;
1997 }
1998
f6d5180c 1999 if (conn->ping_timeout && !conn->recv_timeout) {
322d739d
MC		 2000 iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of "
2001 "zero. Using 5 seconds\n.");
f6d5180c
MC		 2002 conn->recv_timeout = 5;
2003 }
2004
2005 if (conn->recv_timeout && !conn->ping_timeout) {
322d739d
MC		 2006 iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of "
2007 "zero. Using 5 seconds.\n");
f6d5180c
MC		 2008 conn->ping_timeout = 5;
2009 }
2010
7996a778
MC		 2011 spin_lock_bh(&session->lock);
2012 conn->c_stage = ISCSI_CONN_STARTED;
2013 session->state = ISCSI_STATE_LOGGED_IN;
e0726407 2014 session->queued_cmdsn = session->cmdsn;
7996a778 2015
f6d5180c
MC		 2016 conn->last_recv = jiffies;
2017 conn->last_ping = jiffies;
2018 if (conn->recv_timeout && conn->ping_timeout)
2019 mod_timer(&conn->transport_timer,
2020 jiffies + (conn->recv_timeout * HZ));
2021
7996a778
MC		 2022 switch(conn->stop_stage) {
2023 case STOP_CONN_RECOVER:
2024 /*
2025 * unblock eh_abort() if it is blocked. re-try all
2026 * commands after successful recovery
2027 */
7996a778 2028 conn->stop_stage = 0;
843c0a8a 2029 conn->tmf_state = TMF_INITIAL;
7996a778 2030 session->age++;
8b1d0343
MC		 2031 if (session->age == 16)
2032 session->age = 0;
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:
322d739d
MC		 2153 iscsi_conn_printk(KERN_ERR, conn,
2154 "invalid stop flag %d\n", flag);
7996a778
MC		 2155 }
2156}
2157EXPORT_SYMBOL_GPL(iscsi_conn_stop);
2158
2159int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
2160 struct iscsi_cls_conn *cls_conn, int is_leading)
2161{
2162 struct iscsi_session *session = class_to_transport_session(cls_session);
98644047 2163 struct iscsi_conn *conn = cls_conn->dd_data;
7996a778 2164
7996a778 2165 spin_lock_bh(&session->lock);
7996a778
MC		 2166 if (is_leading)
2167 session->leadconn = conn;
98644047 2168 spin_unlock_bh(&session->lock);
7996a778
MC		 2169
2170 /*
2171 * Unblock xmitworker(), Login Phase will pass through.
2172 */
2173 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
2174 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
2175 return 0;
2176}
2177EXPORT_SYMBOL_GPL(iscsi_conn_bind);
2178
a54a52ca
MC		 2179
2180int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
2181 enum iscsi_param param, char *buf, int buflen)
2182{
2183 struct iscsi_conn *conn = cls_conn->dd_data;
2184 struct iscsi_session *session = conn->session;
2185 uint32_t value;
2186
2187 switch(param) {
843c0a8a
MC		 2188 case ISCSI_PARAM_FAST_ABORT:
2189 sscanf(buf, "%d", &session->fast_abort);
2190 break;
f6d5180c
MC		 2191 case ISCSI_PARAM_ABORT_TMO:
2192 sscanf(buf, "%d", &session->abort_timeout);
2193 break;
2194 case ISCSI_PARAM_LU_RESET_TMO:
2195 sscanf(buf, "%d", &session->lu_reset_timeout);
2196 break;
2197 case ISCSI_PARAM_PING_TMO:
2198 sscanf(buf, "%d", &conn->ping_timeout);
2199 break;
2200 case ISCSI_PARAM_RECV_TMO:
2201 sscanf(buf, "%d", &conn->recv_timeout);
2202 break;
a54a52ca
MC		 2203 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2204 sscanf(buf, "%d", &conn->max_recv_dlength);
2205 break;
2206 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2207 sscanf(buf, "%d", &conn->max_xmit_dlength);
2208 break;
2209 case ISCSI_PARAM_HDRDGST_EN:
2210 sscanf(buf, "%d", &conn->hdrdgst_en);
2211 break;
2212 case ISCSI_PARAM_DATADGST_EN:
2213 sscanf(buf, "%d", &conn->datadgst_en);
2214 break;
2215 case ISCSI_PARAM_INITIAL_R2T_EN:
2216 sscanf(buf, "%d", &session->initial_r2t_en);
2217 break;
2218 case ISCSI_PARAM_MAX_R2T:
2219 sscanf(buf, "%d", &session->max_r2t);
2220 break;
2221 case ISCSI_PARAM_IMM_DATA_EN:
2222 sscanf(buf, "%d", &session->imm_data_en);
2223 break;
2224 case ISCSI_PARAM_FIRST_BURST:
2225 sscanf(buf, "%d", &session->first_burst);
2226 break;
2227 case ISCSI_PARAM_MAX_BURST:
2228 sscanf(buf, "%d", &session->max_burst);
2229 break;
2230 case ISCSI_PARAM_PDU_INORDER_EN:
2231 sscanf(buf, "%d", &session->pdu_inorder_en);
2232 break;
2233 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2234 sscanf(buf, "%d", &session->dataseq_inorder_en);
2235 break;
2236 case ISCSI_PARAM_ERL:
2237 sscanf(buf, "%d", &session->erl);
2238 break;
2239 case ISCSI_PARAM_IFMARKER_EN:
2240 sscanf(buf, "%d", &value);
2241 BUG_ON(value);
2242 break;
2243 case ISCSI_PARAM_OFMARKER_EN:
2244 sscanf(buf, "%d", &value);
2245 BUG_ON(value);
2246 break;
2247 case ISCSI_PARAM_EXP_STATSN:
2248 sscanf(buf, "%u", &conn->exp_statsn);
2249 break;
b2c64167
MC		 2250 case ISCSI_PARAM_USERNAME:
2251 kfree(session->username);
2252 session->username = kstrdup(buf, GFP_KERNEL);
2253 if (!session->username)
2254 return -ENOMEM;
2255 break;
2256 case ISCSI_PARAM_USERNAME_IN:
2257 kfree(session->username_in);
2258 session->username_in = kstrdup(buf, GFP_KERNEL);
2259 if (!session->username_in)
2260 return -ENOMEM;
2261 break;
2262 case ISCSI_PARAM_PASSWORD:
2263 kfree(session->password);
2264 session->password = kstrdup(buf, GFP_KERNEL);
2265 if (!session->password)
2266 return -ENOMEM;
2267 break;
2268 case ISCSI_PARAM_PASSWORD_IN:
2269 kfree(session->password_in);
2270 session->password_in = kstrdup(buf, GFP_KERNEL);
2271 if (!session->password_in)
2272 return -ENOMEM;
2273 break;
a54a52ca
MC		 2274 case ISCSI_PARAM_TARGET_NAME:
2275 /* this should not change between logins */
2276 if (session->targetname)
2277 break;
2278
2279 session->targetname = kstrdup(buf, GFP_KERNEL);
2280 if (!session->targetname)
2281 return -ENOMEM;
2282 break;
2283 case ISCSI_PARAM_TPGT:
2284 sscanf(buf, "%d", &session->tpgt);
2285 break;
2286 case ISCSI_PARAM_PERSISTENT_PORT:
2287 sscanf(buf, "%d", &conn->persistent_port);
2288 break;
2289 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2290 /*
2291 * this is the address returned in discovery so it should
2292 * not change between logins.
2293 */
2294 if (conn->persistent_address)
2295 break;
2296
2297 conn->persistent_address = kstrdup(buf, GFP_KERNEL);
2298 if (!conn->persistent_address)
2299 return -ENOMEM;
2300 break;
2301 default:
2302 return -ENOSYS;
2303 }
2304
2305 return 0;
2306}
2307EXPORT_SYMBOL_GPL(iscsi_set_param);
2308
2309int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
2310 enum iscsi_param param, char *buf)
2311{
2312 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
2313 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
2314 int len;
2315
2316 switch(param) {
843c0a8a
MC		 2317 case ISCSI_PARAM_FAST_ABORT:
2318 len = sprintf(buf, "%d\n", session->fast_abort);
2319 break;
f6d5180c
MC		 2320 case ISCSI_PARAM_ABORT_TMO:
2321 len = sprintf(buf, "%d\n", session->abort_timeout);
2322 break;
2323 case ISCSI_PARAM_LU_RESET_TMO:
2324 len = sprintf(buf, "%d\n", session->lu_reset_timeout);
2325 break;
a54a52ca
MC		 2326 case ISCSI_PARAM_INITIAL_R2T_EN:
2327 len = sprintf(buf, "%d\n", session->initial_r2t_en);
2328 break;
2329 case ISCSI_PARAM_MAX_R2T:
2330 len = sprintf(buf, "%hu\n", session->max_r2t);
2331 break;
2332 case ISCSI_PARAM_IMM_DATA_EN:
2333 len = sprintf(buf, "%d\n", session->imm_data_en);
2334 break;
2335 case ISCSI_PARAM_FIRST_BURST:
2336 len = sprintf(buf, "%u\n", session->first_burst);
2337 break;
2338 case ISCSI_PARAM_MAX_BURST:
2339 len = sprintf(buf, "%u\n", session->max_burst);
2340 break;
2341 case ISCSI_PARAM_PDU_INORDER_EN:
2342 len = sprintf(buf, "%d\n", session->pdu_inorder_en);
2343 break;
2344 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2345 len = sprintf(buf, "%d\n", session->dataseq_inorder_en);
2346 break;
2347 case ISCSI_PARAM_ERL:
2348 len = sprintf(buf, "%d\n", session->erl);
2349 break;
2350 case ISCSI_PARAM_TARGET_NAME:
2351 len = sprintf(buf, "%s\n", session->targetname);
2352 break;
2353 case ISCSI_PARAM_TPGT:
2354 len = sprintf(buf, "%d\n", session->tpgt);
2355 break;
b2c64167
MC		 2356 case ISCSI_PARAM_USERNAME:
2357 len = sprintf(buf, "%s\n", session->username);
2358 break;
2359 case ISCSI_PARAM_USERNAME_IN:
2360 len = sprintf(buf, "%s\n", session->username_in);
2361 break;
2362 case ISCSI_PARAM_PASSWORD:
2363 len = sprintf(buf, "%s\n", session->password);
2364 break;
2365 case ISCSI_PARAM_PASSWORD_IN:
2366 len = sprintf(buf, "%s\n", session->password_in);
2367 break;
a54a52ca
MC		 2368 default:
2369 return -ENOSYS;
2370 }
2371
2372 return len;
2373}
2374EXPORT_SYMBOL_GPL(iscsi_session_get_param);
2375
2376int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
2377 enum iscsi_param param, char *buf)
2378{
2379 struct iscsi_conn *conn = cls_conn->dd_data;
2380 int len;
2381
2382 switch(param) {
f6d5180c
MC		 2383 case ISCSI_PARAM_PING_TMO:
2384 len = sprintf(buf, "%u\n", conn->ping_timeout);
2385 break;
2386 case ISCSI_PARAM_RECV_TMO:
2387 len = sprintf(buf, "%u\n", conn->recv_timeout);
2388 break;
a54a52ca
MC		 2389 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2390 len = sprintf(buf, "%u\n", conn->max_recv_dlength);
2391 break;
2392 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2393 len = sprintf(buf, "%u\n", conn->max_xmit_dlength);
2394 break;
2395 case ISCSI_PARAM_HDRDGST_EN:
2396 len = sprintf(buf, "%d\n", conn->hdrdgst_en);
2397 break;
2398 case ISCSI_PARAM_DATADGST_EN:
2399 len = sprintf(buf, "%d\n", conn->datadgst_en);
2400 break;
2401 case ISCSI_PARAM_IFMARKER_EN:
2402 len = sprintf(buf, "%d\n", conn->ifmarker_en);
2403 break;
2404 case ISCSI_PARAM_OFMARKER_EN:
2405 len = sprintf(buf, "%d\n", conn->ofmarker_en);
2406 break;
2407 case ISCSI_PARAM_EXP_STATSN:
2408 len = sprintf(buf, "%u\n", conn->exp_statsn);
2409 break;
2410 case ISCSI_PARAM_PERSISTENT_PORT:
2411 len = sprintf(buf, "%d\n", conn->persistent_port);
2412 break;
2413 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2414 len = sprintf(buf, "%s\n", conn->persistent_address);
2415 break;
2416 default:
2417 return -ENOSYS;
2418 }
2419
2420 return len;
2421}
2422EXPORT_SYMBOL_GPL(iscsi_conn_get_param);
2423
0801c242
MC		 2424int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2425 char *buf)
2426{
2427 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
2428 int len;
2429
2430 switch (param) {
d8196ed2
MC		 2431 case ISCSI_HOST_PARAM_NETDEV_NAME:
2432 if (!session->netdev)
2433 len = sprintf(buf, "%s\n", "default");
2434 else
2435 len = sprintf(buf, "%s\n", session->netdev);
2436 break;
0801c242
MC		 2437 case ISCSI_HOST_PARAM_HWADDRESS:
2438 if (!session->hwaddress)
2439 len = sprintf(buf, "%s\n", "default");
2440 else
2441 len = sprintf(buf, "%s\n", session->hwaddress);
2442 break;
8ad5781a
MC		 2443 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2444 if (!session->initiatorname)
2445 len = sprintf(buf, "%s\n", "unknown");
2446 else
2447 len = sprintf(buf, "%s\n", session->initiatorname);
2448 break;
2449
0801c242
MC		 2450 default:
2451 return -ENOSYS;
2452 }
2453
2454 return len;
2455}
2456EXPORT_SYMBOL_GPL(iscsi_host_get_param);
2457
2458int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2459 char *buf, int buflen)
2460{
2461 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
2462
2463 switch (param) {
d8196ed2
MC		 2464 case ISCSI_HOST_PARAM_NETDEV_NAME:
2465 if (!session->netdev)
2466 session->netdev = kstrdup(buf, GFP_KERNEL);
2467 break;
0801c242
MC		 2468 case ISCSI_HOST_PARAM_HWADDRESS:
2469 if (!session->hwaddress)
2470 session->hwaddress = kstrdup(buf, GFP_KERNEL);
2471 break;
8ad5781a
MC		 2472 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2473 if (!session->initiatorname)
2474 session->initiatorname = kstrdup(buf, GFP_KERNEL);
2475 break;
0801c242
MC		 2476 default:
2477 return -ENOSYS;
2478 }
2479
2480 return 0;
2481}
2482EXPORT_SYMBOL_GPL(iscsi_host_set_param);
2483
7996a778
MC		 2484MODULE_AUTHOR("Mike Christie");
2485MODULE_DESCRIPTION("iSCSI library functions");
2486MODULE_LICENSE("GPL");
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