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[SCSI] iscsi: extended cdb support
[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
38d1c069
BH		 140/*
141 * make an extended cdb AHS
142 */
143static int iscsi_prep_ecdb_ahs(struct iscsi_cmd_task *ctask)
144{
145 struct scsi_cmnd *cmd = ctask->sc;
146 unsigned rlen, pad_len;
147 unsigned short ahslength;
148 struct iscsi_ecdb_ahdr *ecdb_ahdr;
149 int rc;
150
151 ecdb_ahdr = iscsi_next_hdr(ctask);
152 rlen = cmd->cmd_len - ISCSI_CDB_SIZE;
153
154 BUG_ON(rlen > sizeof(ecdb_ahdr->ecdb));
155 ahslength = rlen + sizeof(ecdb_ahdr->reserved);
156
157 pad_len = iscsi_padding(rlen);
158
159 rc = iscsi_add_hdr(ctask, sizeof(ecdb_ahdr->ahslength) +
160 sizeof(ecdb_ahdr->ahstype) + ahslength + pad_len);
161 if (rc)
162 return rc;
163
164 if (pad_len)
165 memset(&ecdb_ahdr->ecdb[rlen], 0, pad_len);
166
167 ecdb_ahdr->ahslength = cpu_to_be16(ahslength);
168 ecdb_ahdr->ahstype = ISCSI_AHSTYPE_CDB;
169 ecdb_ahdr->reserved = 0;
170 memcpy(ecdb_ahdr->ecdb, cmd->cmnd + ISCSI_CDB_SIZE, rlen);
171
172 debug_scsi("iscsi_prep_ecdb_ahs: varlen_cdb_len %d "
173 "rlen %d pad_len %d ahs_length %d iscsi_headers_size %u\n",
174 cmd->cmd_len, rlen, pad_len, ahslength, ctask->hdr_len);
175
176 return 0;
177}
178
7996a778
MC		 179/**
180 * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
181 * @ctask: iscsi cmd task
182 *
183 * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set
184 * fields like dlength or final based on how much data it sends
185 */
004d6530 186static int iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask)
7996a778
MC		 187{
188 struct iscsi_conn *conn = ctask->conn;
189 struct iscsi_session *session = conn->session;
190 struct iscsi_cmd *hdr = ctask->hdr;
191 struct scsi_cmnd *sc = ctask->sc;
38d1c069 192 unsigned hdrlength, cmd_len;
004d6530 193 int rc;
7996a778 194
004d6530
BH		 195 ctask->hdr_len = 0;
196 rc = iscsi_add_hdr(ctask, sizeof(*hdr));
197 if (rc)
198 return rc;
a8ac6311
OK		 199 hdr->opcode = ISCSI_OP_SCSI_CMD;
200 hdr->flags = ISCSI_ATTR_SIMPLE;
201 int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun);
8b1d0343 202 hdr->itt = build_itt(ctask->itt, session->age);
a8ac6311
OK		 203 hdr->data_length = cpu_to_be32(scsi_bufflen(sc));
204 hdr->cmdsn = cpu_to_be32(session->cmdsn);
205 session->cmdsn++;
206 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
38d1c069
BH		 207 cmd_len = sc->cmd_len;
208 if (cmd_len < ISCSI_CDB_SIZE)
209 memset(&hdr->cdb[cmd_len], 0, ISCSI_CDB_SIZE - cmd_len);
210 else if (cmd_len > ISCSI_CDB_SIZE) {
211 rc = iscsi_prep_ecdb_ahs(ctask);
212 if (rc)
213 return rc;
214 cmd_len = ISCSI_CDB_SIZE;
215 }
216 memcpy(hdr->cdb, sc->cmnd, cmd_len);
7996a778 217
218432c6 218 ctask->imm_count = 0;
7996a778
MC		 219 if (sc->sc_data_direction == DMA_TO_DEVICE) {
220 hdr->flags |= ISCSI_FLAG_CMD_WRITE;
221 /*
222 * Write counters:
223 *
224 * imm_count bytes to be sent right after
225 * SCSI PDU Header
226 *
227 * unsol_count bytes(as Data-Out) to be sent
228 * without R2T ack right after
229 * immediate data
230 *
231 * r2t_data_count bytes to be sent via R2T ack's
232 *
233 * pad_count bytes to be sent as zero-padding
234 */
7996a778 235 ctask->unsol_count = 0;
ffd0436e 236 ctask->unsol_offset = 0;
7996a778
MC		 237 ctask->unsol_datasn = 0;
238
239 if (session->imm_data_en) {
1c138991 240 if (scsi_bufflen(sc) >= session->first_burst)
7996a778
MC		 241 ctask->imm_count = min(session->first_burst,
242 conn->max_xmit_dlength);
243 else
1c138991 244 ctask->imm_count = min(scsi_bufflen(sc),
7996a778 245 conn->max_xmit_dlength);
a8ac6311 246 hton24(hdr->dlength, ctask->imm_count);
7996a778 247 } else
a8ac6311 248 zero_data(hdr->dlength);
7996a778 249
ffd0436e 250 if (!session->initial_r2t_en) {
857ae0bd 251 ctask->unsol_count = min((session->first_burst),
1c138991 252 (scsi_bufflen(sc))) - ctask->imm_count;
ffd0436e
MC		 253 ctask->unsol_offset = ctask->imm_count;
254 }
255
7996a778
MC		 256 if (!ctask->unsol_count)
257 /* No unsolicit Data-Out's */
a8ac6311 258 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
7996a778 259 } else {
7996a778
MC		 260 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
261 zero_data(hdr->dlength);
262
263 if (sc->sc_data_direction == DMA_FROM_DEVICE)
264 hdr->flags |= ISCSI_FLAG_CMD_READ;
265 }
266
004d6530
BH		 267 /* calculate size of additional header segments (AHSs) */
268 hdrlength = ctask->hdr_len - sizeof(*hdr);
269
270 WARN_ON(hdrlength & (ISCSI_PAD_LEN-1));
271 hdrlength /= ISCSI_PAD_LEN;
272
273 WARN_ON(hdrlength >= 256);
274 hdr->hlength = hdrlength & 0xFF;
275
a8ac6311
OK		 276 if (conn->session->tt->init_cmd_task(conn->ctask))
277 return EIO;
77a23c21 278
a8ac6311
OK		 279 conn->scsicmd_pdus_cnt++;
280 debug_scsi("iscsi prep [%s cid %d sc %p cdb 0x%x itt 0x%x len %d "
77a23c21 281 "cmdsn %d win %d]\n",
a8ac6311 282 sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read",
1c138991 283 conn->id, sc, sc->cmnd[0], ctask->itt, scsi_bufflen(sc),
a8ac6311 284 session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1);
004d6530 285 return 0;
7996a778 286}
7996a778
MC		 287
288/**
289 * iscsi_complete_command - return command back to scsi-ml
7996a778
MC		 290 * @ctask: iscsi cmd task
291 *
292 * Must be called with session lock.
293 * This function returns the scsi command to scsi-ml and returns
294 * the cmd task to the pool of available cmd tasks.
295 */
60ecebf5 296static void iscsi_complete_command(struct iscsi_cmd_task *ctask)
7996a778 297{
c1635cb7
MC		 298 struct iscsi_conn *conn = ctask->conn;
299 struct iscsi_session *session = conn->session;
7996a778
MC		 300 struct scsi_cmnd *sc = ctask->sc;
301
b6c395ed 302 ctask->state = ISCSI_TASK_COMPLETED;
7996a778 303 ctask->sc = NULL;
f47f2cf5
MC		 304 /* SCSI eh reuses commands to verify us */
305 sc->SCp.ptr = NULL;
c1635cb7
MC		 306 if (conn->ctask == ctask)
307 conn->ctask = NULL;
7996a778
MC		 308 list_del_init(&ctask->running);
309 __kfifo_put(session->cmdpool.queue, (void*)&ctask, sizeof(void*));
310 sc->scsi_done(sc);
311}
312
60ecebf5
MC		 313static void __iscsi_get_ctask(struct iscsi_cmd_task *ctask)
314{
315 atomic_inc(&ctask->refcount);
316}
317
60ecebf5
MC		 318static void __iscsi_put_ctask(struct iscsi_cmd_task *ctask)
319{
e648f63c 320 if (atomic_dec_and_test(&ctask->refcount))
60ecebf5 321 iscsi_complete_command(ctask);
60ecebf5
MC		 322}
323
b3a7ea8d
MC		 324/*
325 * session lock must be held
326 */
327static void fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
328 int err)
329{
330 struct scsi_cmnd *sc;
331
332 sc = ctask->sc;
333 if (!sc)
334 return;
335
336 if (ctask->state == ISCSI_TASK_PENDING)
337 /*
338 * cmd never made it to the xmit thread, so we should not count
339 * the cmd in the sequencing
340 */
341 conn->session->queued_cmdsn--;
342 else
343 conn->session->tt->cleanup_cmd_task(conn, ctask);
344
345 sc->result = err;
346 scsi_set_resid(sc, scsi_bufflen(sc));
347 if (conn->ctask == ctask)
348 conn->ctask = NULL;
349 /* release ref from queuecommand */
350 __iscsi_put_ctask(ctask);
351}
352
353/**
354 * iscsi_free_mgmt_task - return mgmt task back to pool
355 * @conn: iscsi connection
356 * @mtask: mtask
357 *
358 * Must be called with session lock.
359 */
360void iscsi_free_mgmt_task(struct iscsi_conn *conn,
361 struct iscsi_mgmt_task *mtask)
362{
363 list_del_init(&mtask->running);
364 if (conn->login_mtask == mtask)
365 return;
f6d5180c
MC		 366
367 if (conn->ping_mtask == mtask)
368 conn->ping_mtask = NULL;
b3a7ea8d
MC		 369 __kfifo_put(conn->session->mgmtpool.queue,
370 (void*)&mtask, sizeof(void*));
371}
372EXPORT_SYMBOL_GPL(iscsi_free_mgmt_task);
373
f6d5180c
MC		 374static struct iscsi_mgmt_task *
375__iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
376 char *data, uint32_t data_size)
377{
378 struct iscsi_session *session = conn->session;
379 struct iscsi_mgmt_task *mtask;
380
381 if (session->state == ISCSI_STATE_TERMINATE)
382 return NULL;
383
384 if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) ||
385 hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
386 /*
387 * Login and Text are sent serially, in
388 * request-followed-by-response sequence.
389 * Same mtask can be used. Same ITT must be used.
390 * Note that login_mtask is preallocated at conn_create().
391 */
392 mtask = conn->login_mtask;
393 else {
394 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
395 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
396
397 if (!__kfifo_get(session->mgmtpool.queue,
398 (void*)&mtask, sizeof(void*)))
399 return NULL;
400 }
401
402 if (data_size) {
403 memcpy(mtask->data, data, data_size);
404 mtask->data_count = data_size;
405 } else
406 mtask->data_count = 0;
407
408 memcpy(mtask->hdr, hdr, sizeof(struct iscsi_hdr));
409 INIT_LIST_HEAD(&mtask->running);
410 list_add_tail(&mtask->running, &conn->mgmtqueue);
411 return mtask;
412}
413
414int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr,
415 char *data, uint32_t data_size)
416{
417 struct iscsi_conn *conn = cls_conn->dd_data;
418 struct iscsi_session *session = conn->session;
419 int err = 0;
420
421 spin_lock_bh(&session->lock);
422 if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size))
423 err = -EPERM;
424 spin_unlock_bh(&session->lock);
425 scsi_queue_work(session->host, &conn->xmitwork);
426 return err;
427}
428EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu);
429
7996a778
MC		 430/**
431 * iscsi_cmd_rsp - SCSI Command Response processing
432 * @conn: iscsi connection
433 * @hdr: iscsi header
434 * @ctask: scsi command task
435 * @data: cmd data buffer
436 * @datalen: len of buffer
437 *
438 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and
439 * then completes the command and task.
440 **/
77a23c21
MC		 441static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
442 struct iscsi_cmd_task *ctask, char *data,
443 int datalen)
7996a778 444{
7996a778
MC		 445 struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)hdr;
446 struct iscsi_session *session = conn->session;
447 struct scsi_cmnd *sc = ctask->sc;
448
77a23c21 449 iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr);
7996a778
MC		 450 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
451
452 sc->result = (DID_OK << 16) | rhdr->cmd_status;
453
454 if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) {
455 sc->result = DID_ERROR << 16;
456 goto out;
457 }
458
459 if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) {
9b80cb4b 460 uint16_t senselen;
7996a778
MC		 461
462 if (datalen < 2) {
463invalid_datalen:
322d739d
MC		 464 iscsi_conn_printk(KERN_ERR, conn,
465 "Got CHECK_CONDITION but invalid data "
466 "buffer size of %d\n", datalen);
7996a778
MC		 467 sc->result = DID_BAD_TARGET << 16;
468 goto out;
469 }
470
8eb00539 471 senselen = be16_to_cpu(get_unaligned((__be16 *) data));
7996a778
MC		 472 if (datalen < senselen)
473 goto invalid_datalen;
474
475 memcpy(sc->sense_buffer, data + 2,
9b80cb4b 476 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
7996a778 477 debug_scsi("copied %d bytes of sense\n",
8eb00539 478 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
7996a778
MC		 479 }
480
7207fea4
BH		 481 if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW |
482 ISCSI_FLAG_CMD_OVERFLOW)) {
7996a778
MC		 483 int res_count = be32_to_cpu(rhdr->residual_count);
484
7207fea4
BH		 485 if (res_count > 0 &&
486 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
487 res_count <= scsi_bufflen(sc)))
1c138991 488 scsi_set_resid(sc, res_count);
7996a778
MC		 489 else
490 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
7207fea4
BH		 491 } else if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW |
492 ISCSI_FLAG_CMD_BIDI_OVERFLOW))
7996a778 493 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
7996a778
MC		 494
495out:
496 debug_scsi("done [sc %lx res %d itt 0x%x]\n",
497 (long)sc, sc->result, ctask->itt);
498 conn->scsirsp_pdus_cnt++;
499
60ecebf5 500 __iscsi_put_ctask(ctask);
7996a778
MC		 501}
502
7ea8b828
MC		 503static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
504{
505 struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr;
506
507 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
508 conn->tmfrsp_pdus_cnt++;
509
843c0a8a 510 if (conn->tmf_state != TMF_QUEUED)
7ea8b828
MC		 511 return;
512
513 if (tmf->response == ISCSI_TMF_RSP_COMPLETE)
843c0a8a 514 conn->tmf_state = TMF_SUCCESS;
7ea8b828 515 else if (tmf->response == ISCSI_TMF_RSP_NO_TASK)
843c0a8a 516 conn->tmf_state = TMF_NOT_FOUND;
7ea8b828 517 else
843c0a8a 518 conn->tmf_state = TMF_FAILED;
7ea8b828
MC		 519 wake_up(&conn->ehwait);
520}
521
f6d5180c
MC		 522static void iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr)
523{
524 struct iscsi_nopout hdr;
525 struct iscsi_mgmt_task *mtask;
526
527 if (!rhdr && conn->ping_mtask)
528 return;
529
530 memset(&hdr, 0, sizeof(struct iscsi_nopout));
531 hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE;
532 hdr.flags = ISCSI_FLAG_CMD_FINAL;
533
534 if (rhdr) {
535 memcpy(hdr.lun, rhdr->lun, 8);
536 hdr.ttt = rhdr->ttt;
537 hdr.itt = RESERVED_ITT;
538 } else
539 hdr.ttt = RESERVED_ITT;
540
541 mtask = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0);
542 if (!mtask) {
322d739d 543 iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n");
f6d5180c
MC		 544 return;
545 }
546
547 /* only track our nops */
548 if (!rhdr) {
549 conn->ping_mtask = mtask;
550 conn->last_ping = jiffies;
551 }
552 scsi_queue_work(conn->session->host, &conn->xmitwork);
553}
554
62f38300
MC		 555static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
556 char *data, int datalen)
557{
558 struct iscsi_reject *reject = (struct iscsi_reject *)hdr;
559 struct iscsi_hdr rejected_pdu;
560 uint32_t itt;
561
562 conn->exp_statsn = be32_to_cpu(reject->statsn) + 1;
563
564 if (reject->reason == ISCSI_REASON_DATA_DIGEST_ERROR) {
565 if (ntoh24(reject->dlength) > datalen)
566 return ISCSI_ERR_PROTO;
567
568 if (ntoh24(reject->dlength) >= sizeof(struct iscsi_hdr)) {
569 memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr));
b4377356 570 itt = get_itt(rejected_pdu.itt);
322d739d
MC		 571 iscsi_conn_printk(KERN_ERR, conn,
572 "itt 0x%x had pdu (op 0x%x) rejected "
573 "due to DataDigest error.\n", itt,
574 rejected_pdu.opcode);
62f38300
MC		 575 }
576 }
577 return 0;
578}
579
7996a778
MC		 580/**
581 * __iscsi_complete_pdu - complete pdu
582 * @conn: iscsi conn
583 * @hdr: iscsi header
584 * @data: data buffer
585 * @datalen: len of data buffer
586 *
587 * Completes pdu processing by freeing any resources allocated at
588 * queuecommand or send generic. session lock must be held and verify
589 * itt must have been called.
590 */
f8d9d654
AB		 591static int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
592 char *data, int datalen)
7996a778
MC		 593{
594 struct iscsi_session *session = conn->session;
595 int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0;
596 struct iscsi_cmd_task *ctask;
597 struct iscsi_mgmt_task *mtask;
598 uint32_t itt;
599
f6d5180c 600 conn->last_recv = jiffies;
b4377356
AV		 601 if (hdr->itt != RESERVED_ITT)
602 itt = get_itt(hdr->itt);
7996a778 603 else
b4377356 604 itt = ~0U;
7996a778
MC		 605
606 if (itt < session->cmds_max) {
607 ctask = session->cmds[itt];
608
609 debug_scsi("cmdrsp [op 0x%x cid %d itt 0x%x len %d]\n",
610 opcode, conn->id, ctask->itt, datalen);
611
612 switch(opcode) {
613 case ISCSI_OP_SCSI_CMD_RSP:
614 BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
77a23c21
MC		 615 iscsi_scsi_cmd_rsp(conn, hdr, ctask, data,
616 datalen);
7996a778
MC		 617 break;
618 case ISCSI_OP_SCSI_DATA_IN:
619 BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
620 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
621 conn->scsirsp_pdus_cnt++;
60ecebf5 622 __iscsi_put_ctask(ctask);
7996a778
MC		 623 }
624 break;
625 case ISCSI_OP_R2T:
626 /* LLD handles this for now */
627 break;
628 default:
629 rc = ISCSI_ERR_BAD_OPCODE;
630 break;
631 }
632 } else if (itt >= ISCSI_MGMT_ITT_OFFSET &&
633 itt < ISCSI_MGMT_ITT_OFFSET + session->mgmtpool_max) {
634 mtask = session->mgmt_cmds[itt - ISCSI_MGMT_ITT_OFFSET];
635
636 debug_scsi("immrsp [op 0x%x cid %d itt 0x%x len %d]\n",
637 opcode, conn->id, mtask->itt, datalen);
638
77a23c21 639 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
7996a778 640 switch(opcode) {
8d2860b3 641 case ISCSI_OP_LOGOUT_RSP:
c8dc1e52
MC		 642 if (datalen) {
643 rc = ISCSI_ERR_PROTO;
644 break;
645 }
8d2860b3
MC		 646 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
647 /* fall through */
7996a778
MC		 648 case ISCSI_OP_LOGIN_RSP:
649 case ISCSI_OP_TEXT_RSP:
8d2860b3
MC		 650 /*
651 * login related PDU's exp_statsn is handled in
652 * userspace
653 */
40527afe
MC		 654 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
655 rc = ISCSI_ERR_CONN_FAILED;
b3a7ea8d 656 iscsi_free_mgmt_task(conn, mtask);
7996a778
MC		 657 break;
658 case ISCSI_OP_SCSI_TMFUNC_RSP:
7996a778
MC		 659 if (datalen) {
660 rc = ISCSI_ERR_PROTO;
661 break;
662 }
8d2860b3 663
7ea8b828 664 iscsi_tmf_rsp(conn, hdr);
b3a7ea8d 665 iscsi_free_mgmt_task(conn, mtask);
7996a778
MC		 666 break;
667 case ISCSI_OP_NOOP_IN:
f6d5180c
MC		 668 if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) ||
669 datalen) {
7996a778
MC		 670 rc = ISCSI_ERR_PROTO;
671 break;
672 }
7996a778
MC		 673 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
674
f6d5180c
MC		 675 if (conn->ping_mtask != mtask) {
676 /*
677 * If this is not in response to one of our
678 * nops then it must be from userspace.
679 */
680 if (iscsi_recv_pdu(conn->cls_conn, hdr, data,
681 datalen))
682 rc = ISCSI_ERR_CONN_FAILED;
683 }
b3a7ea8d 684 iscsi_free_mgmt_task(conn, mtask);
7996a778
MC		 685 break;
686 default:
687 rc = ISCSI_ERR_BAD_OPCODE;
688 break;
689 }
b4377356 690 } else if (itt == ~0U) {
77a23c21 691 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
62f38300 692
7996a778
MC		 693 switch(opcode) {
694 case ISCSI_OP_NOOP_IN:
40527afe 695 if (datalen) {
7996a778 696 rc = ISCSI_ERR_PROTO;
40527afe
MC		 697 break;
698 }
699
b4377356 700 if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG))
40527afe
MC		 701 break;
702
f6d5180c 703 iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr);
7996a778
MC		 704 break;
705 case ISCSI_OP_REJECT:
62f38300
MC		 706 rc = iscsi_handle_reject(conn, hdr, data, datalen);
707 break;
7996a778 708 case ISCSI_OP_ASYNC_EVENT:
8d2860b3 709 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
5831c737
MC		 710 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
711 rc = ISCSI_ERR_CONN_FAILED;
7996a778
MC		 712 break;
713 default:
714 rc = ISCSI_ERR_BAD_OPCODE;
715 break;
716 }
717 } else
718 rc = ISCSI_ERR_BAD_ITT;
719
720 return rc;
721}
7996a778
MC		 722
723int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
724 char *data, int datalen)
725{
726 int rc;
727
728 spin_lock(&conn->session->lock);
729 rc = __iscsi_complete_pdu(conn, hdr, data, datalen);
730 spin_unlock(&conn->session->lock);
731 return rc;
732}
733EXPORT_SYMBOL_GPL(iscsi_complete_pdu);
734
735/* verify itt (itt encoding: age+cid+itt) */
736int iscsi_verify_itt(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
737 uint32_t *ret_itt)
738{
739 struct iscsi_session *session = conn->session;
740 struct iscsi_cmd_task *ctask;
741 uint32_t itt;
742
b4377356
AV		 743 if (hdr->itt != RESERVED_ITT) {
744 if (((__force u32)hdr->itt & ISCSI_AGE_MASK) !=
7996a778 745 (session->age << ISCSI_AGE_SHIFT)) {
322d739d
MC		 746 iscsi_conn_printk(KERN_ERR, conn,
747 "received itt %x expected session "
748 "age (%x)\n", (__force u32)hdr->itt,
749 session->age & ISCSI_AGE_MASK);
7996a778
MC		 750 return ISCSI_ERR_BAD_ITT;
751 }
752
b4377356 753 itt = get_itt(hdr->itt);
7996a778 754 } else
b4377356 755 itt = ~0U;
7996a778
MC		 756
757 if (itt < session->cmds_max) {
758 ctask = session->cmds[itt];
759
760 if (!ctask->sc) {
322d739d
MC		 761 iscsi_conn_printk(KERN_INFO, conn, "dropping ctask "
762 "with itt 0x%x\n", ctask->itt);
7996a778
MC		 763 /* force drop */
764 return ISCSI_ERR_NO_SCSI_CMD;
765 }
766
767 if (ctask->sc->SCp.phase != session->age) {
322d739d
MC		 768 iscsi_conn_printk(KERN_ERR, conn,
769 "iscsi: ctask's session age %d, "
770 "expected %d\n", ctask->sc->SCp.phase,
771 session->age);
7996a778
MC		 772 return ISCSI_ERR_SESSION_FAILED;
773 }
774 }
775
776 *ret_itt = itt;
777 return 0;
778}
779EXPORT_SYMBOL_GPL(iscsi_verify_itt);
780
781void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
782{
783 struct iscsi_session *session = conn->session;
784 unsigned long flags;
785
786 spin_lock_irqsave(&session->lock, flags);
656cffc9
MC		 787 if (session->state == ISCSI_STATE_FAILED) {
788 spin_unlock_irqrestore(&session->lock, flags);
789 return;
790 }
791
67a61114 792 if (conn->stop_stage == 0)
7996a778
MC		 793 session->state = ISCSI_STATE_FAILED;
794 spin_unlock_irqrestore(&session->lock, flags);
795 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
796 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
797 iscsi_conn_error(conn->cls_conn, err);
798}
799EXPORT_SYMBOL_GPL(iscsi_conn_failure);
800
77a23c21
MC		 801static void iscsi_prep_mtask(struct iscsi_conn *conn,
802 struct iscsi_mgmt_task *mtask)
803{
804 struct iscsi_session *session = conn->session;
805 struct iscsi_hdr *hdr = mtask->hdr;
806 struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
807
808 if (hdr->opcode != (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) &&
809 hdr->opcode != (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
810 nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
811 /*
812 * pre-format CmdSN for outgoing PDU.
813 */
814 nop->cmdsn = cpu_to_be32(session->cmdsn);
815 if (hdr->itt != RESERVED_ITT) {
8b1d0343 816 hdr->itt = build_itt(mtask->itt, session->age);
e0726407
MC		 817 /*
818 * TODO: We always use immediate, so we never hit this.
819 * If we start to send tmfs or nops as non-immediate then
820 * we should start checking the cmdsn numbers for mgmt tasks.
821 */
77a23c21 822 if (conn->c_stage == ISCSI_CONN_STARTED &&
e0726407
MC		 823 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
824 session->queued_cmdsn++;
77a23c21 825 session->cmdsn++;
e0726407 826 }
77a23c21
MC		 827 }
828
829 if (session->tt->init_mgmt_task)
830 session->tt->init_mgmt_task(conn, mtask);
831
832 debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n",
843c0a8a
MC		 833 hdr->opcode & ISCSI_OPCODE_MASK, hdr->itt,
834 mtask->data_count);
77a23c21
MC		 835}
836
05db888a 837static int iscsi_xmit_mtask(struct iscsi_conn *conn)
b5072ea0
MC		 838{
839 struct iscsi_hdr *hdr = conn->mtask->hdr;
b3a7ea8d 840 int rc;
b5072ea0 841
b3a7ea8d
MC		 842 if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT)
843 conn->session->state = ISCSI_STATE_LOGGING_OUT;
77a23c21 844 spin_unlock_bh(&conn->session->lock);
b3a7ea8d 845
b5072ea0 846 rc = conn->session->tt->xmit_mgmt_task(conn, conn->mtask);
77a23c21 847 spin_lock_bh(&conn->session->lock);
b5072ea0
MC		 848 if (rc)
849 return rc;
850
05db888a
MC		 851 /* done with this in-progress mtask */
852 conn->mtask = NULL;
b5072ea0
MC		 853 return 0;
854}
855
77a23c21
MC		 856static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn)
857{
858 struct iscsi_session *session = conn->session;
859
860 /*
861 * Check for iSCSI window and take care of CmdSN wrap-around
862 */
e0726407
MC		 863 if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) {
864 debug_scsi("iSCSI CmdSN closed. ExpCmdSn %u MaxCmdSN %u "
865 "CmdSN %u/%u\n", session->exp_cmdsn,
866 session->max_cmdsn, session->cmdsn,
867 session->queued_cmdsn);
77a23c21
MC		 868 return -ENOSPC;
869 }
870 return 0;
871}
872
873static int iscsi_xmit_ctask(struct iscsi_conn *conn)
874{
875 struct iscsi_cmd_task *ctask = conn->ctask;
843c0a8a 876 int rc;
77a23c21
MC		 877
878 __iscsi_get_ctask(ctask);
879 spin_unlock_bh(&conn->session->lock);
880 rc = conn->session->tt->xmit_cmd_task(conn, ctask);
881 spin_lock_bh(&conn->session->lock);
882 __iscsi_put_ctask(ctask);
77a23c21
MC		 883 if (!rc)
884 /* done with this ctask */
885 conn->ctask = NULL;
886 return rc;
887}
888
843c0a8a
MC		 889/**
890 * iscsi_requeue_ctask - requeue ctask to run from session workqueue
891 * @ctask: ctask to requeue
892 *
893 * LLDs that need to run a ctask from the session workqueue should call
894 * this. The session lock must be held.
895 */
896void iscsi_requeue_ctask(struct iscsi_cmd_task *ctask)
897{
898 struct iscsi_conn *conn = ctask->conn;
899
900 list_move_tail(&ctask->running, &conn->requeue);
901 scsi_queue_work(conn->session->host, &conn->xmitwork);
902}
903EXPORT_SYMBOL_GPL(iscsi_requeue_ctask);
904
7996a778
MC		 905/**
906 * iscsi_data_xmit - xmit any command into the scheduled connection
907 * @conn: iscsi connection
908 *
909 * Notes:
910 * The function can return -EAGAIN in which case the caller must
911 * re-schedule it again later or recover. '0' return code means
912 * successful xmit.
913 **/
914static int iscsi_data_xmit(struct iscsi_conn *conn)
915{
3219e529 916 int rc = 0;
7996a778 917
77a23c21 918 spin_lock_bh(&conn->session->lock);
7996a778
MC		 919 if (unlikely(conn->suspend_tx)) {
920 debug_scsi("conn %d Tx suspended!\n", conn->id);
77a23c21 921 spin_unlock_bh(&conn->session->lock);
3219e529 922 return -ENODATA;
7996a778 923 }
7996a778
MC		 924
925 if (conn->ctask) {
77a23c21 926 rc = iscsi_xmit_ctask(conn);
3219e529 927 if (rc)
7996a778 928 goto again;
7996a778 929 }
77a23c21 930
7996a778 931 if (conn->mtask) {
05db888a 932 rc = iscsi_xmit_mtask(conn);
3219e529 933 if (rc)
7996a778 934 goto again;
7996a778
MC		 935 }
936
77a23c21
MC		 937 /*
938 * process mgmt pdus like nops before commands since we should
939 * only have one nop-out as a ping from us and targets should not
940 * overflow us with nop-ins
941 */
942check_mgmt:
843c0a8a
MC		 943 while (!list_empty(&conn->mgmtqueue)) {
944 conn->mtask = list_entry(conn->mgmtqueue.next,
945 struct iscsi_mgmt_task, running);
b3a7ea8d
MC		 946 if (conn->session->state == ISCSI_STATE_LOGGING_OUT) {
947 iscsi_free_mgmt_task(conn, conn->mtask);
948 conn->mtask = NULL;
949 continue;
950 }
951
77a23c21 952 iscsi_prep_mtask(conn, conn->mtask);
843c0a8a 953 list_move_tail(conn->mgmtqueue.next, &conn->mgmt_run_list);
77a23c21
MC		 954 rc = iscsi_xmit_mtask(conn);
955 if (rc)
956 goto again;
7996a778
MC		 957 }
958
843c0a8a 959 /* process pending command queue */
b6c395ed 960 while (!list_empty(&conn->xmitqueue)) {
843c0a8a
MC		 961 if (conn->tmf_state == TMF_QUEUED)
962 break;
963
b6c395ed
MC		 964 conn->ctask = list_entry(conn->xmitqueue.next,
965 struct iscsi_cmd_task, running);
b3a7ea8d 966 if (conn->session->state == ISCSI_STATE_LOGGING_OUT) {
9000bcd6 967 fail_command(conn, conn->ctask, DID_IMM_RETRY << 16);
b3a7ea8d
MC		 968 continue;
969 }
004d6530
BH		 970 if (iscsi_prep_scsi_cmd_pdu(conn->ctask)) {
971 fail_command(conn, conn->ctask, DID_ABORT << 16);
972 continue;
973 }
a8ac6311 974
843c0a8a 975 conn->ctask->state = ISCSI_TASK_RUNNING;
b6c395ed 976 list_move_tail(conn->xmitqueue.next, &conn->run_list);
77a23c21
MC		 977 rc = iscsi_xmit_ctask(conn);
978 if (rc)
60ecebf5 979 goto again;
77a23c21
MC		 980 /*
981 * we could continuously get new ctask requests so
982 * we need to check the mgmt queue for nops that need to
983 * be sent to aviod starvation
984 */
843c0a8a
MC		 985 if (!list_empty(&conn->mgmtqueue))
986 goto check_mgmt;
987 }
988
989 while (!list_empty(&conn->requeue)) {
990 if (conn->session->fast_abort && conn->tmf_state != TMF_INITIAL)
991 break;
992
b3a7ea8d
MC		 993 /*
994 * we always do fastlogout - conn stop code will clean up.
995 */
996 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
997 break;
998
843c0a8a
MC		 999 conn->ctask = list_entry(conn->requeue.next,
1000 struct iscsi_cmd_task, running);
1001 conn->ctask->state = ISCSI_TASK_RUNNING;
1002 list_move_tail(conn->requeue.next, &conn->run_list);
1003 rc = iscsi_xmit_ctask(conn);
1004 if (rc)
1005 goto again;
1006 if (!list_empty(&conn->mgmtqueue))
77a23c21 1007 goto check_mgmt;
7996a778 1008 }
b6c395ed 1009 spin_unlock_bh(&conn->session->lock);
3219e529 1010 return -ENODATA;
7996a778
MC		 1011
1012again:
1013 if (unlikely(conn->suspend_tx))
77a23c21
MC		 1014 rc = -ENODATA;
1015 spin_unlock_bh(&conn->session->lock);
3219e529 1016 return rc;
7996a778
MC		 1017}
1018
c4028958 1019static void iscsi_xmitworker(struct work_struct *work)
7996a778 1020{
c4028958
DH		 1021 struct iscsi_conn *conn =
1022 container_of(work, struct iscsi_conn, xmitwork);
3219e529 1023 int rc;
7996a778
MC		 1024 /*
1025 * serialize Xmit worker on a per-connection basis.
1026 */
3219e529
MC		 1027 do {
1028 rc = iscsi_data_xmit(conn);
1029 } while (rc >= 0 || rc == -EAGAIN);
7996a778
MC		 1030}
1031
1032enum {
1033 FAILURE_BAD_HOST = 1,
1034 FAILURE_SESSION_FAILED,
1035 FAILURE_SESSION_FREED,
1036 FAILURE_WINDOW_CLOSED,
60ecebf5 1037 FAILURE_OOM,
7996a778 1038 FAILURE_SESSION_TERMINATE,
656cffc9 1039 FAILURE_SESSION_IN_RECOVERY,
7996a778 1040 FAILURE_SESSION_RECOVERY_TIMEOUT,
b3a7ea8d 1041 FAILURE_SESSION_LOGGING_OUT,
6eabafbe 1042 FAILURE_SESSION_NOT_READY,
7996a778
MC		 1043};
1044
1045int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
1046{
1047 struct Scsi_Host *host;
1048 int reason = 0;
1049 struct iscsi_session *session;
1050 struct iscsi_conn *conn;
1051 struct iscsi_cmd_task *ctask = NULL;
1052
1053 sc->scsi_done = done;
1054 sc->result = 0;
f47f2cf5 1055 sc->SCp.ptr = NULL;
7996a778
MC		 1056
1057 host = sc->device->host;
1040c99d 1058 spin_unlock(host->host_lock);
7996a778 1059
1040c99d 1060 session = iscsi_hostdata(host->hostdata);
7996a778
MC		 1061 spin_lock(&session->lock);
1062
6eabafbe
MC		 1063 reason = iscsi_session_chkready(session_to_cls(session));
1064 if (reason) {
1065 sc->result = reason;
1066 goto fault;
1067 }
1068
656cffc9
MC		 1069 /*
1070 * ISCSI_STATE_FAILED is a temp. state. The recovery
1071 * code will decide what is best to do with command queued
1072 * during this time
1073 */
1074 if (session->state != ISCSI_STATE_LOGGED_IN &&
1075 session->state != ISCSI_STATE_FAILED) {
1076 /*
1077 * to handle the race between when we set the recovery state
1078 * and block the session we requeue here (commands could
1079 * be entering our queuecommand while a block is starting
1080 * up because the block code is not locked)
1081 */
9000bcd6
MC		 1082 switch (session->state) {
1083 case ISCSI_STATE_IN_RECOVERY:
656cffc9 1084 reason = FAILURE_SESSION_IN_RECOVERY;
6eabafbe
MC		 1085 sc->result = DID_IMM_RETRY << 16;
1086 break;
9000bcd6
MC		 1087 case ISCSI_STATE_LOGGING_OUT:
1088 reason = FAILURE_SESSION_LOGGING_OUT;
6eabafbe
MC		 1089 sc->result = DID_IMM_RETRY << 16;
1090 break;
b3a7ea8d 1091 case ISCSI_STATE_RECOVERY_FAILED:
656cffc9 1092 reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
6eabafbe 1093 sc->result = DID_NO_CONNECT << 16;
b3a7ea8d
MC		 1094 break;
1095 case ISCSI_STATE_TERMINATE:
656cffc9 1096 reason = FAILURE_SESSION_TERMINATE;
6eabafbe 1097 sc->result = DID_NO_CONNECT << 16;
b3a7ea8d 1098 break;
b3a7ea8d 1099 default:
656cffc9 1100 reason = FAILURE_SESSION_FREED;
6eabafbe 1101 sc->result = DID_NO_CONNECT << 16;
b3a7ea8d 1102 }
7996a778
MC		 1103 goto fault;
1104 }
1105
7996a778 1106 conn = session->leadconn;
98644047
MC		 1107 if (!conn) {
1108 reason = FAILURE_SESSION_FREED;
6eabafbe 1109 sc->result = DID_NO_CONNECT << 16;
98644047
MC		 1110 goto fault;
1111 }
7996a778 1112
77a23c21
MC		 1113 if (iscsi_check_cmdsn_window_closed(conn)) {
1114 reason = FAILURE_WINDOW_CLOSED;
1115 goto reject;
1116 }
1117
60ecebf5
MC		 1118 if (!__kfifo_get(session->cmdpool.queue, (void*)&ctask,
1119 sizeof(void*))) {
1120 reason = FAILURE_OOM;
1121 goto reject;
1122 }
e0726407
MC		 1123 session->queued_cmdsn++;
1124
7996a778
MC		 1125 sc->SCp.phase = session->age;
1126 sc->SCp.ptr = (char *)ctask;
1127
60ecebf5 1128 atomic_set(&ctask->refcount, 1);
b6c395ed 1129 ctask->state = ISCSI_TASK_PENDING;
7996a778
MC		 1130 ctask->conn = conn;
1131 ctask->sc = sc;
1132 INIT_LIST_HEAD(&ctask->running);
7996a778 1133
b6c395ed 1134 list_add_tail(&ctask->running, &conn->xmitqueue);
7996a778
MC		 1135 spin_unlock(&session->lock);
1136
1137 scsi_queue_work(host, &conn->xmitwork);
1040c99d 1138 spin_lock(host->host_lock);
7996a778
MC		 1139 return 0;
1140
1141reject:
1142 spin_unlock(&session->lock);
1143 debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason);
1040c99d 1144 spin_lock(host->host_lock);
7996a778
MC		 1145 return SCSI_MLQUEUE_HOST_BUSY;
1146
1147fault:
1148 spin_unlock(&session->lock);
6eabafbe 1149 debug_scsi("iscsi: cmd 0x%x is not queued (%d)\n", sc->cmnd[0], reason);
1c138991 1150 scsi_set_resid(sc, scsi_bufflen(sc));
7996a778 1151 sc->scsi_done(sc);
1040c99d 1152 spin_lock(host->host_lock);
7996a778
MC		 1153 return 0;
1154}
1155EXPORT_SYMBOL_GPL(iscsi_queuecommand);
1156
1157int iscsi_change_queue_depth(struct scsi_device *sdev, int depth)
1158{
1159 if (depth > ISCSI_MAX_CMD_PER_LUN)
1160 depth = ISCSI_MAX_CMD_PER_LUN;
1161 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
1162 return sdev->queue_depth;
1163}
1164EXPORT_SYMBOL_GPL(iscsi_change_queue_depth);
1165
7996a778
MC		 1166void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
1167{
1168 struct iscsi_session *session = class_to_transport_session(cls_session);
7996a778
MC		 1169
1170 spin_lock_bh(&session->lock);
1171 if (session->state != ISCSI_STATE_LOGGED_IN) {
656cffc9 1172 session->state = ISCSI_STATE_RECOVERY_FAILED;
843c0a8a
MC		 1173 if (session->leadconn)
1174 wake_up(&session->leadconn->ehwait);
7996a778
MC		 1175 }
1176 spin_unlock_bh(&session->lock);
1177}
1178EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
1179
1180int iscsi_eh_host_reset(struct scsi_cmnd *sc)
1181{
1182 struct Scsi_Host *host = sc->device->host;
1183 struct iscsi_session *session = iscsi_hostdata(host->hostdata);
1184 struct iscsi_conn *conn = session->leadconn;
7996a778 1185
bc436b27 1186 mutex_lock(&session->eh_mutex);
7996a778
MC		 1187 spin_lock_bh(&session->lock);
1188 if (session->state == ISCSI_STATE_TERMINATE) {
1189failed:
1190 debug_scsi("failing host reset: session terminated "
d6e24d1c 1191 "[CID %d age %d]\n", conn->id, session->age);
7996a778 1192 spin_unlock_bh(&session->lock);
bc436b27 1193 mutex_unlock(&session->eh_mutex);
7996a778
MC		 1194 return FAILED;
1195 }
1196
7996a778 1197 spin_unlock_bh(&session->lock);
bc436b27 1198 mutex_unlock(&session->eh_mutex);
7996a778
MC		 1199 /*
1200 * we drop the lock here but the leadconn cannot be destoyed while
1201 * we are in the scsi eh
1202 */
843c0a8a 1203 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
7996a778
MC		 1204
1205 debug_scsi("iscsi_eh_host_reset wait for relogin\n");
1206 wait_event_interruptible(conn->ehwait,
1207 session->state == ISCSI_STATE_TERMINATE ||
1208 session->state == ISCSI_STATE_LOGGED_IN ||
656cffc9 1209 session->state == ISCSI_STATE_RECOVERY_FAILED);
7996a778
MC		 1210 if (signal_pending(current))
1211 flush_signals(current);
1212
bc436b27 1213 mutex_lock(&session->eh_mutex);
7996a778
MC		 1214 spin_lock_bh(&session->lock);
1215 if (session->state == ISCSI_STATE_LOGGED_IN)
322d739d
MC		 1216 iscsi_session_printk(KERN_INFO, session,
1217 "host reset succeeded\n");
7996a778
MC		 1218 else
1219 goto failed;
1220 spin_unlock_bh(&session->lock);
bc436b27 1221 mutex_unlock(&session->eh_mutex);
7996a778
MC		 1222 return SUCCESS;
1223}
1224EXPORT_SYMBOL_GPL(iscsi_eh_host_reset);
1225
843c0a8a 1226static void iscsi_tmf_timedout(unsigned long data)
7996a778 1227{
843c0a8a 1228 struct iscsi_conn *conn = (struct iscsi_conn *)data;
7996a778
MC		 1229 struct iscsi_session *session = conn->session;
1230
1231 spin_lock(&session->lock);
843c0a8a
MC		 1232 if (conn->tmf_state == TMF_QUEUED) {
1233 conn->tmf_state = TMF_TIMEDOUT;
1234 debug_scsi("tmf timedout\n");
7996a778
MC		 1235 /* unblock eh_abort() */
1236 wake_up(&conn->ehwait);
1237 }
1238 spin_unlock(&session->lock);
1239}
1240
843c0a8a 1241static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn,
f6d5180c
MC		 1242 struct iscsi_tm *hdr, int age,
1243 int timeout)
7996a778 1244{
7996a778 1245 struct iscsi_session *session = conn->session;
843c0a8a 1246 struct iscsi_mgmt_task *mtask;
7996a778 1247
843c0a8a
MC		 1248 mtask = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr,
1249 NULL, 0);
1250 if (!mtask) {
6724add1 1251 spin_unlock_bh(&session->lock);
7996a778 1252 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
843c0a8a
MC		 1253 spin_lock_bh(&session->lock);
1254 debug_scsi("tmf exec failure\n");
77a23c21 1255 return -EPERM;
7996a778 1256 }
843c0a8a 1257 conn->tmfcmd_pdus_cnt++;
f6d5180c 1258 conn->tmf_timer.expires = timeout * HZ + jiffies;
843c0a8a
MC		 1259 conn->tmf_timer.function = iscsi_tmf_timedout;
1260 conn->tmf_timer.data = (unsigned long)conn;
1261 add_timer(&conn->tmf_timer);
1262 debug_scsi("tmf set timeout\n");
7996a778 1263
7996a778 1264 spin_unlock_bh(&session->lock);
6724add1 1265 mutex_unlock(&session->eh_mutex);
77a23c21 1266 scsi_queue_work(session->host, &conn->xmitwork);
7996a778
MC		 1267
1268 /*
1269 * block eh thread until:
1270 *
843c0a8a
MC		 1271 * 1) tmf response
1272 * 2) tmf timeout
7996a778
MC		 1273 * 3) session is terminated or restarted or userspace has
1274 * given up on recovery
1275 */
843c0a8a 1276 wait_event_interruptible(conn->ehwait, age != session->age ||
7996a778 1277 session->state != ISCSI_STATE_LOGGED_IN ||
843c0a8a 1278 conn->tmf_state != TMF_QUEUED);
7996a778
MC		 1279 if (signal_pending(current))
1280 flush_signals(current);
843c0a8a
MC		 1281 del_timer_sync(&conn->tmf_timer);
1282
6724add1 1283 mutex_lock(&session->eh_mutex);
77a23c21 1284 spin_lock_bh(&session->lock);
843c0a8a
MC		 1285 /* if the session drops it will clean up the mtask */
1286 if (age != session->age ||
1287 session->state != ISCSI_STATE_LOGGED_IN)
1288 return -ENOTCONN;
7996a778
MC		 1289 return 0;
1290}
1291
843c0a8a
MC		 1292/*
1293 * Fail commands. session lock held and recv side suspended and xmit
1294 * thread flushed
1295 */
6eabafbe
MC		 1296static void fail_all_commands(struct iscsi_conn *conn, unsigned lun,
1297 int error)
843c0a8a
MC		 1298{
1299 struct iscsi_cmd_task *ctask, *tmp;
1300
1301 if (conn->ctask && (conn->ctask->sc->device->lun == lun || lun == -1))
1302 conn->ctask = NULL;
1303
1304 /* flush pending */
1305 list_for_each_entry_safe(ctask, tmp, &conn->xmitqueue, running) {
1306 if (lun == ctask->sc->device->lun || lun == -1) {
1307 debug_scsi("failing pending sc %p itt 0x%x\n",
1308 ctask->sc, ctask->itt);
6eabafbe 1309 fail_command(conn, ctask, error << 16);
843c0a8a
MC		 1310 }
1311 }
1312
1313 list_for_each_entry_safe(ctask, tmp, &conn->requeue, running) {
1314 if (lun == ctask->sc->device->lun || lun == -1) {
1315 debug_scsi("failing requeued sc %p itt 0x%x\n",
1316 ctask->sc, ctask->itt);
6eabafbe 1317 fail_command(conn, ctask, error << 16);
843c0a8a
MC		 1318 }
1319 }
1320
1321 /* fail all other running */
1322 list_for_each_entry_safe(ctask, tmp, &conn->run_list, running) {
1323 if (lun == ctask->sc->device->lun || lun == -1) {
1324 debug_scsi("failing in progress sc %p itt 0x%x\n",
1325 ctask->sc, ctask->itt);
1326 fail_command(conn, ctask, DID_BUS_BUSY << 16);
1327 }
1328 }
1329}
1330
6724add1
MC		 1331static void iscsi_suspend_tx(struct iscsi_conn *conn)
1332{
1333 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1334 scsi_flush_work(conn->session->host);
1335}
1336
1337static void iscsi_start_tx(struct iscsi_conn *conn)
1338{
1339 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1340 scsi_queue_work(conn->session->host, &conn->xmitwork);
1341}
1342
f6d5180c
MC		 1343static enum scsi_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *scmd)
1344{
1345 struct iscsi_cls_session *cls_session;
1346 struct iscsi_session *session;
1347 struct iscsi_conn *conn;
1348 enum scsi_eh_timer_return rc = EH_NOT_HANDLED;
1349
1350 cls_session = starget_to_session(scsi_target(scmd->device));
1351 session = class_to_transport_session(cls_session);
1352
1353 debug_scsi("scsi cmd %p timedout\n", scmd);
1354
1355 spin_lock(&session->lock);
1356 if (session->state != ISCSI_STATE_LOGGED_IN) {
1357 /*
1358 * We are probably in the middle of iscsi recovery so let
1359 * that complete and handle the error.
1360 */
1361 rc = EH_RESET_TIMER;
1362 goto done;
1363 }
1364
1365 conn = session->leadconn;
1366 if (!conn) {
1367 /* In the middle of shuting down */
1368 rc = EH_RESET_TIMER;
1369 goto done;
1370 }
1371
1372 if (!conn->recv_timeout && !conn->ping_timeout)
1373 goto done;
1374 /*
1375 * if the ping timedout then we are in the middle of cleaning up
1376 * and can let the iscsi eh handle it
1377 */
1378 if (time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) +
1379 (conn->ping_timeout * HZ), jiffies))
1380 rc = EH_RESET_TIMER;
1381 /*
1382 * if we are about to check the transport then give the command
1383 * more time
1384 */
1385 if (time_before_eq(conn->last_recv + (conn->recv_timeout * HZ),
1386 jiffies))
1387 rc = EH_RESET_TIMER;
1388 /* if in the middle of checking the transport then give us more time */
1389 if (conn->ping_mtask)
1390 rc = EH_RESET_TIMER;
1391done:
1392 spin_unlock(&session->lock);
1393 debug_scsi("return %s\n", rc == EH_RESET_TIMER ? "timer reset" : "nh");
1394 return rc;
1395}
1396
1397static void iscsi_check_transport_timeouts(unsigned long data)
1398{
1399 struct iscsi_conn *conn = (struct iscsi_conn *)data;
1400 struct iscsi_session *session = conn->session;
1401 unsigned long timeout, next_timeout = 0, last_recv;
1402
1403 spin_lock(&session->lock);
1404 if (session->state != ISCSI_STATE_LOGGED_IN)
1405 goto done;
1406
1407 timeout = conn->recv_timeout;
1408 if (!timeout)
1409 goto done;
1410
1411 timeout *= HZ;
1412 last_recv = conn->last_recv;
1413 if (time_before_eq(last_recv + timeout + (conn->ping_timeout * HZ),
1414 jiffies)) {
322d739d
MC		 1415 iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs "
1416 "expired, last rx %lu, last ping %lu, "
1417 "now %lu\n", conn->ping_timeout, last_recv,
1418 conn->last_ping, jiffies);
f6d5180c
MC		 1419 spin_unlock(&session->lock);
1420 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1421 return;
1422 }
1423
1424 if (time_before_eq(last_recv + timeout, jiffies)) {
1425 if (time_before_eq(conn->last_ping, last_recv)) {
1426 /* send a ping to try to provoke some traffic */
1427 debug_scsi("Sending nopout as ping on conn %p\n", conn);
1428 iscsi_send_nopout(conn, NULL);
1429 }
1430 next_timeout = last_recv + timeout + (conn->ping_timeout * HZ);
ad294e9c 1431 } else
f6d5180c 1432 next_timeout = last_recv + timeout;
f6d5180c 1433
ad294e9c
MC		 1434 debug_scsi("Setting next tmo %lu\n", next_timeout);
1435 mod_timer(&conn->transport_timer, next_timeout);
f6d5180c
MC		 1436done:
1437 spin_unlock(&session->lock);
1438}
1439
843c0a8a
MC		 1440static void iscsi_prep_abort_task_pdu(struct iscsi_cmd_task *ctask,
1441 struct iscsi_tm *hdr)
1442{
1443 memset(hdr, 0, sizeof(*hdr));
1444 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
1445 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK;
1446 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
1447 memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
1448 hdr->rtt = ctask->hdr->itt;
1449 hdr->refcmdsn = ctask->hdr->cmdsn;
1450}
1451
7996a778
MC		 1452int iscsi_eh_abort(struct scsi_cmnd *sc)
1453{
6724add1
MC		 1454 struct Scsi_Host *host = sc->device->host;
1455 struct iscsi_session *session = iscsi_hostdata(host->hostdata);
f47f2cf5 1456 struct iscsi_conn *conn;
843c0a8a
MC		 1457 struct iscsi_cmd_task *ctask;
1458 struct iscsi_tm *hdr;
1459 int rc, age;
7996a778 1460
6724add1
MC		 1461 mutex_lock(&session->eh_mutex);
1462 spin_lock_bh(&session->lock);
f47f2cf5
MC		 1463 /*
1464 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
1465 * got the command.
1466 */
1467 if (!sc->SCp.ptr) {
1468 debug_scsi("sc never reached iscsi layer or it completed.\n");
6724add1
MC		 1469 spin_unlock_bh(&session->lock);
1470 mutex_unlock(&session->eh_mutex);
f47f2cf5
MC		 1471 return SUCCESS;
1472 }
1473
7996a778
MC		 1474 /*
1475 * If we are not logged in or we have started a new session
1476 * then let the host reset code handle this
1477 */
843c0a8a
MC		 1478 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN ||
1479 sc->SCp.phase != session->age) {
1480 spin_unlock_bh(&session->lock);
1481 mutex_unlock(&session->eh_mutex);
1482 return FAILED;
1483 }
1484
1485 conn = session->leadconn;
1486 conn->eh_abort_cnt++;
1487 age = session->age;
1488
1489 ctask = (struct iscsi_cmd_task *)sc->SCp.ptr;
1490 debug_scsi("aborting [sc %p itt 0x%x]\n", sc, ctask->itt);
7996a778
MC		 1491
1492 /* ctask completed before time out */
7ea8b828 1493 if (!ctask->sc) {
7ea8b828 1494 debug_scsi("sc completed while abort in progress\n");
77a23c21 1495 goto success;
7ea8b828 1496 }
7996a778 1497
77a23c21
MC		 1498 if (ctask->state == ISCSI_TASK_PENDING) {
1499 fail_command(conn, ctask, DID_ABORT << 16);
1500 goto success;
1501 }
7996a778 1502
843c0a8a
MC		 1503 /* only have one tmf outstanding at a time */
1504 if (conn->tmf_state != TMF_INITIAL)
7996a778 1505 goto failed;
843c0a8a 1506 conn->tmf_state = TMF_QUEUED;
7996a778 1507
843c0a8a
MC		 1508 hdr = &conn->tmhdr;
1509 iscsi_prep_abort_task_pdu(ctask, hdr);
1510
f6d5180c 1511 if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout)) {
843c0a8a
MC		 1512 rc = FAILED;
1513 goto failed;
1514 }
1515
1516 switch (conn->tmf_state) {
1517 case TMF_SUCCESS:
77a23c21 1518 spin_unlock_bh(&session->lock);
6724add1 1519 iscsi_suspend_tx(conn);
77a23c21
MC		 1520 /*
1521 * clean up task if aborted. grab the recv lock as a writer
1522 */
1523 write_lock_bh(conn->recv_lock);
1524 spin_lock(&session->lock);
1525 fail_command(conn, ctask, DID_ABORT << 16);
843c0a8a 1526 conn->tmf_state = TMF_INITIAL;
77a23c21
MC		 1527 spin_unlock(&session->lock);
1528 write_unlock_bh(conn->recv_lock);
6724add1 1529 iscsi_start_tx(conn);
77a23c21 1530 goto success_unlocked;
843c0a8a
MC		 1531 case TMF_TIMEDOUT:
1532 spin_unlock_bh(&session->lock);
1533 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1534 goto failed_unlocked;
1535 case TMF_NOT_FOUND:
1536 if (!sc->SCp.ptr) {
1537 conn->tmf_state = TMF_INITIAL;
7ea8b828 1538 /* ctask completed before tmf abort response */
7ea8b828 1539 debug_scsi("sc completed while abort in progress\n");
77a23c21 1540 goto success;
7ea8b828
MC		 1541 }
1542 /* fall through */
1543 default:
843c0a8a
MC		 1544 conn->tmf_state = TMF_INITIAL;
1545 goto failed;
7996a778
MC		 1546 }
1547
77a23c21 1548success:
7996a778 1549 spin_unlock_bh(&session->lock);
77a23c21
MC		 1550success_unlocked:
1551 debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
6724add1 1552 mutex_unlock(&session->eh_mutex);
7996a778
MC		 1553 return SUCCESS;
1554
1555failed:
1556 spin_unlock_bh(&session->lock);
77a23c21 1557failed_unlocked:
843c0a8a
MC		 1558 debug_scsi("abort failed [sc %p itt 0x%x]\n", sc,
1559 ctask ? ctask->itt : 0);
6724add1 1560 mutex_unlock(&session->eh_mutex);
7996a778
MC		 1561 return FAILED;
1562}
1563EXPORT_SYMBOL_GPL(iscsi_eh_abort);
1564
843c0a8a
MC		 1565static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
1566{
1567 memset(hdr, 0, sizeof(*hdr));
1568 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
1569 hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK;
1570 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
1571 int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun);
f6d5180c 1572 hdr->rtt = RESERVED_ITT;
843c0a8a
MC		 1573}
1574
1575int iscsi_eh_device_reset(struct scsi_cmnd *sc)
1576{
1577 struct Scsi_Host *host = sc->device->host;
1578 struct iscsi_session *session = iscsi_hostdata(host->hostdata);
1579 struct iscsi_conn *conn;
1580 struct iscsi_tm *hdr;
1581 int rc = FAILED;
1582
1583 debug_scsi("LU Reset [sc %p lun %u]\n", sc, sc->device->lun);
1584
1585 mutex_lock(&session->eh_mutex);
1586 spin_lock_bh(&session->lock);
1587 /*
1588 * Just check if we are not logged in. We cannot check for
1589 * the phase because the reset could come from a ioctl.
1590 */
1591 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
1592 goto unlock;
1593 conn = session->leadconn;
1594
1595 /* only have one tmf outstanding at a time */
1596 if (conn->tmf_state != TMF_INITIAL)
1597 goto unlock;
1598 conn->tmf_state = TMF_QUEUED;
1599
1600 hdr = &conn->tmhdr;
1601 iscsi_prep_lun_reset_pdu(sc, hdr);
1602
f6d5180c
MC		 1603 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
1604 session->lu_reset_timeout)) {
843c0a8a
MC		 1605 rc = FAILED;
1606 goto unlock;
1607 }
1608
1609 switch (conn->tmf_state) {
1610 case TMF_SUCCESS:
1611 break;
1612 case TMF_TIMEDOUT:
1613 spin_unlock_bh(&session->lock);
1614 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1615 goto done;
1616 default:
1617 conn->tmf_state = TMF_INITIAL;
1618 goto unlock;
1619 }
1620
1621 rc = SUCCESS;
1622 spin_unlock_bh(&session->lock);
1623
1624 iscsi_suspend_tx(conn);
1625 /* need to grab the recv lock then session lock */
1626 write_lock_bh(conn->recv_lock);
1627 spin_lock(&session->lock);
6eabafbe 1628 fail_all_commands(conn, sc->device->lun, DID_ERROR);
843c0a8a
MC		 1629 conn->tmf_state = TMF_INITIAL;
1630 spin_unlock(&session->lock);
1631 write_unlock_bh(conn->recv_lock);
1632
1633 iscsi_start_tx(conn);
1634 goto done;
1635
1636unlock:
1637 spin_unlock_bh(&session->lock);
1638done:
1639 debug_scsi("iscsi_eh_device_reset %s\n",
1640 rc == SUCCESS ? "SUCCESS" : "FAILED");
1641 mutex_unlock(&session->eh_mutex);
1642 return rc;
1643}
1644EXPORT_SYMBOL_GPL(iscsi_eh_device_reset);
1645
6320377f
OK		 1646/*
1647 * Pre-allocate a pool of @max items of @item_size. By default, the pool
1648 * should be accessed via kfifo_{get,put} on q->queue.
1649 * Optionally, the caller can obtain the array of object pointers
1650 * by passing in a non-NULL @items pointer
1651 */
7996a778 1652int
6320377f 1653iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size)
7996a778 1654{
6320377f 1655 int i, num_arrays = 1;
7996a778 1656
6320377f 1657 memset(q, 0, sizeof(*q));
7996a778
MC		 1658
1659 q->max = max;
6320377f
OK		 1660
1661 /* If the user passed an items pointer, he wants a copy of
1662 * the array. */
1663 if (items)
1664 num_arrays++;
1665 q->pool = kzalloc(num_arrays * max * sizeof(void*), GFP_KERNEL);
1666 if (q->pool == NULL)
1667 goto enomem;
7996a778
MC		 1668
1669 q->queue = kfifo_init((void*)q->pool, max * sizeof(void*),
1670 GFP_KERNEL, NULL);
6320377f
OK		 1671 if (q->queue == ERR_PTR(-ENOMEM))
1672 goto enomem;
7996a778
MC		 1673
1674 for (i = 0; i < max; i++) {
6320377f 1675 q->pool[i] = kzalloc(item_size, GFP_KERNEL);
7996a778 1676 if (q->pool[i] == NULL) {
6320377f
OK		 1677 q->max = i;
1678 goto enomem;
7996a778 1679 }
7996a778
MC		 1680 __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*));
1681 }
6320377f
OK		 1682
1683 if (items) {
1684 *items = q->pool + max;
1685 memcpy(*items, q->pool, max * sizeof(void *));
1686 }
1687
7996a778 1688 return 0;
6320377f
OK		 1689
1690enomem:
1691 iscsi_pool_free(q);
1692 return -ENOMEM;
7996a778
MC		 1693}
1694EXPORT_SYMBOL_GPL(iscsi_pool_init);
1695
6320377f 1696void iscsi_pool_free(struct iscsi_pool *q)
7996a778
MC		 1697{
1698 int i;
1699
1700 for (i = 0; i < q->max; i++)
6320377f
OK		 1701 kfree(q->pool[i]);
1702 if (q->pool)
1703 kfree(q->pool);
7996a778
MC		 1704}
1705EXPORT_SYMBOL_GPL(iscsi_pool_free);
1706
1707/*
1708 * iSCSI Session's hostdata organization:
1709 *
1710 * *------------------* <== hostdata_session(host->hostdata)
1711 * | ptr to class sess|
1712 * |------------------| <== iscsi_hostdata(host->hostdata)
1713 * | iscsi_session |
1714 * *------------------*
1715 */
1716
1717#define hostdata_privsize(_sz) (sizeof(unsigned long) + _sz + \
1718 _sz % sizeof(unsigned long))
1719
1720#define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata))
1721
1722/**
1723 * iscsi_session_setup - create iscsi cls session and host and session
1724 * @scsit: scsi transport template
1725 * @iscsit: iscsi transport template
1548271e
MC		 1726 * @cmds_max: scsi host can queue
1727 * @qdepth: scsi host cmds per lun
1728 * @cmd_task_size: LLD ctask private data size
1729 * @mgmt_task_size: LLD mtask private data size
7996a778
MC		 1730 * @initial_cmdsn: initial CmdSN
1731 * @hostno: host no allocated
1732 *
1733 * This can be used by software iscsi_transports that allocate
1734 * a session per scsi host.
1735 **/
1736struct iscsi_cls_session *
1737iscsi_session_setup(struct iscsi_transport *iscsit,
1738 struct scsi_transport_template *scsit,
1548271e 1739 uint16_t cmds_max, uint16_t qdepth,
7996a778
MC		 1740 int cmd_task_size, int mgmt_task_size,
1741 uint32_t initial_cmdsn, uint32_t *hostno)
1742{
1743 struct Scsi_Host *shost;
1744 struct iscsi_session *session;
1745 struct iscsi_cls_session *cls_session;
1746 int cmd_i;
1747
1548271e
MC		 1748 if (qdepth > ISCSI_MAX_CMD_PER_LUN || qdepth < 1) {
1749 if (qdepth != 0)
1750 printk(KERN_ERR "iscsi: invalid queue depth of %d. "
1751 "Queue depth must be between 1 and %d.\n",
1752 qdepth, ISCSI_MAX_CMD_PER_LUN);
1753 qdepth = ISCSI_DEF_CMD_PER_LUN;
1754 }
1755
31ed0bf4
MC		 1756 if (!is_power_of_2(cmds_max) || cmds_max >= ISCSI_MGMT_ITT_OFFSET ||
1757 cmds_max < 2) {
1548271e
MC		 1758 if (cmds_max != 0)
1759 printk(KERN_ERR "iscsi: invalid can_queue of %d. "
1760 "can_queue must be a power of 2 and between "
1761 "2 and %d - setting to %d.\n", cmds_max,
1762 ISCSI_MGMT_ITT_OFFSET, ISCSI_DEF_XMIT_CMDS_MAX);
1763 cmds_max = ISCSI_DEF_XMIT_CMDS_MAX;
1764 }
1765
7996a778
MC		 1766 shost = scsi_host_alloc(iscsit->host_template,
1767 hostdata_privsize(sizeof(*session)));
1768 if (!shost)
1769 return NULL;
1770
1548271e
MC		 1771 /* the iscsi layer takes one task for reserve */
1772 shost->can_queue = cmds_max - 1;
1773 shost->cmd_per_lun = qdepth;
7996a778
MC		 1774 shost->max_id = 1;
1775 shost->max_channel = 0;
1776 shost->max_lun = iscsit->max_lun;
1777 shost->max_cmd_len = iscsit->max_cmd_len;
1778 shost->transportt = scsit;
1779 shost->transportt->create_work_queue = 1;
f6d5180c 1780 shost->transportt->eh_timed_out = iscsi_eh_cmd_timed_out;
7996a778
MC		 1781 *hostno = shost->host_no;
1782
1783 session = iscsi_hostdata(shost->hostdata);
1784 memset(session, 0, sizeof(struct iscsi_session));
1785 session->host = shost;
1786 session->state = ISCSI_STATE_FREE;
f6d5180c 1787 session->fast_abort = 1;
4cd49ea1
MC		 1788 session->lu_reset_timeout = 15;
1789 session->abort_timeout = 10;
7996a778 1790 session->mgmtpool_max = ISCSI_MGMT_CMDS_MAX;
1548271e 1791 session->cmds_max = cmds_max;
e0726407 1792 session->queued_cmdsn = session->cmdsn = initial_cmdsn;
7996a778
MC		 1793 session->exp_cmdsn = initial_cmdsn + 1;
1794 session->max_cmdsn = initial_cmdsn + 1;
1795 session->max_r2t = 1;
1796 session->tt = iscsit;
6724add1 1797 mutex_init(&session->eh_mutex);
7996a778
MC		 1798
1799 /* initialize SCSI PDU commands pool */
1800 if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
1801 (void***)&session->cmds,
1802 cmd_task_size + sizeof(struct iscsi_cmd_task)))
1803 goto cmdpool_alloc_fail;
1804
1805 /* pre-format cmds pool with ITT */
1806 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
1807 struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
1808
1809 if (cmd_task_size)
1810 ctask->dd_data = &ctask[1];
1811 ctask->itt = cmd_i;
b6c395ed 1812 INIT_LIST_HEAD(&ctask->running);
7996a778
MC		 1813 }
1814
1815 spin_lock_init(&session->lock);
7996a778
MC		 1816
1817 /* initialize immediate command pool */
1818 if (iscsi_pool_init(&session->mgmtpool, session->mgmtpool_max,
1819 (void***)&session->mgmt_cmds,
1820 mgmt_task_size + sizeof(struct iscsi_mgmt_task)))
1821 goto mgmtpool_alloc_fail;
1822
1823
1824 /* pre-format immediate cmds pool with ITT */
1825 for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) {
1826 struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i];
1827
1828 if (mgmt_task_size)
1829 mtask->dd_data = &mtask[1];
1830 mtask->itt = ISCSI_MGMT_ITT_OFFSET + cmd_i;
b6c395ed 1831 INIT_LIST_HEAD(&mtask->running);
7996a778
MC		 1832 }
1833
1834 if (scsi_add_host(shost, NULL))
1835 goto add_host_fail;
1836
f53a88da
MC		 1837 if (!try_module_get(iscsit->owner))
1838 goto cls_session_fail;
1839
6a8a0d36 1840 cls_session = iscsi_create_session(shost, iscsit, 0);
7996a778 1841 if (!cls_session)
f53a88da 1842 goto module_put;
7996a778
MC		 1843 *(unsigned long*)shost->hostdata = (unsigned long)cls_session;
1844
1845 return cls_session;
1846
f53a88da
MC		 1847module_put:
1848 module_put(iscsit->owner);
7996a778
MC		 1849cls_session_fail:
1850 scsi_remove_host(shost);
1851add_host_fail:
6320377f 1852 iscsi_pool_free(&session->mgmtpool);
7996a778 1853mgmtpool_alloc_fail:
6320377f 1854 iscsi_pool_free(&session->cmdpool);
7996a778
MC		 1855cmdpool_alloc_fail:
1856 scsi_host_put(shost);
1857 return NULL;
1858}
1859EXPORT_SYMBOL_GPL(iscsi_session_setup);
1860
1861/**
1862 * iscsi_session_teardown - destroy session, host, and cls_session
1863 * shost: scsi host
1864 *
1865 * This can be used by software iscsi_transports that allocate
1866 * a session per scsi host.
1867 **/
1868void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
1869{
1870 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
1871 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
63f75cc8 1872 struct module *owner = cls_session->transport->owner;
7996a778 1873
26974789 1874 iscsi_remove_session(cls_session);
7996a778
MC		 1875 scsi_remove_host(shost);
1876
6320377f
OK		 1877 iscsi_pool_free(&session->mgmtpool);
1878 iscsi_pool_free(&session->cmdpool);
7996a778 1879
b2c64167
MC		 1880 kfree(session->password);
1881 kfree(session->password_in);
1882 kfree(session->username);
1883 kfree(session->username_in);
f3ff0c36 1884 kfree(session->targetname);
d8196ed2 1885 kfree(session->netdev);
0801c242 1886 kfree(session->hwaddress);
8ad5781a 1887 kfree(session->initiatorname);
f3ff0c36 1888
26974789 1889 iscsi_free_session(cls_session);
7996a778 1890 scsi_host_put(shost);
63f75cc8 1891 module_put(owner);
7996a778
MC		 1892}
1893EXPORT_SYMBOL_GPL(iscsi_session_teardown);
1894
1895/**
1896 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
1897 * @cls_session: iscsi_cls_session
1898 * @conn_idx: cid
1899 **/
1900struct iscsi_cls_conn *
1901iscsi_conn_setup(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
1902{
1903 struct iscsi_session *session = class_to_transport_session(cls_session);
1904 struct iscsi_conn *conn;
1905 struct iscsi_cls_conn *cls_conn;
d36ab6f3 1906 char *data;
7996a778
MC		 1907
1908 cls_conn = iscsi_create_conn(cls_session, conn_idx);
1909 if (!cls_conn)
1910 return NULL;
1911 conn = cls_conn->dd_data;
1912 memset(conn, 0, sizeof(*conn));
1913
1914 conn->session = session;
1915 conn->cls_conn = cls_conn;
1916 conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
1917 conn->id = conn_idx;
1918 conn->exp_statsn = 0;
843c0a8a 1919 conn->tmf_state = TMF_INITIAL;
f6d5180c
MC		 1920
1921 init_timer(&conn->transport_timer);
1922 conn->transport_timer.data = (unsigned long)conn;
1923 conn->transport_timer.function = iscsi_check_transport_timeouts;
1924
7996a778
MC		 1925 INIT_LIST_HEAD(&conn->run_list);
1926 INIT_LIST_HEAD(&conn->mgmt_run_list);
843c0a8a 1927 INIT_LIST_HEAD(&conn->mgmtqueue);
b6c395ed 1928 INIT_LIST_HEAD(&conn->xmitqueue);
843c0a8a 1929 INIT_LIST_HEAD(&conn->requeue);
c4028958 1930 INIT_WORK(&conn->xmitwork, iscsi_xmitworker);
7996a778
MC		 1931
1932 /* allocate login_mtask used for the login/text sequences */
1933 spin_lock_bh(&session->lock);
1934 if (!__kfifo_get(session->mgmtpool.queue,
1935 (void*)&conn->login_mtask,
1936 sizeof(void*))) {
1937 spin_unlock_bh(&session->lock);
1938 goto login_mtask_alloc_fail;
1939 }
1940 spin_unlock_bh(&session->lock);
1941
bf32ed33 1942 data = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN, GFP_KERNEL);
d36ab6f3
MC		 1943 if (!data)
1944 goto login_mtask_data_alloc_fail;
c8dc1e52 1945 conn->login_mtask->data = conn->data = data;
d36ab6f3 1946
843c0a8a 1947 init_timer(&conn->tmf_timer);
7996a778
MC		 1948 init_waitqueue_head(&conn->ehwait);
1949
1950 return cls_conn;
1951
d36ab6f3
MC		 1952login_mtask_data_alloc_fail:
1953 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
1954 sizeof(void*));
7996a778 1955login_mtask_alloc_fail:
7996a778
MC		 1956 iscsi_destroy_conn(cls_conn);
1957 return NULL;
1958}
1959EXPORT_SYMBOL_GPL(iscsi_conn_setup);
1960
1961/**
1962 * iscsi_conn_teardown - teardown iscsi connection
1963 * cls_conn: iscsi class connection
1964 *
1965 * TODO: we may need to make this into a two step process
1966 * like scsi-mls remove + put host
1967 */
1968void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
1969{
1970 struct iscsi_conn *conn = cls_conn->dd_data;
1971 struct iscsi_session *session = conn->session;
1972 unsigned long flags;
1973
f6d5180c
MC		 1974 del_timer_sync(&conn->transport_timer);
1975
7996a778
MC		 1976 spin_lock_bh(&session->lock);
1977 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
1978 if (session->leadconn == conn) {
1979 /*
1980 * leading connection? then give up on recovery.
1981 */
1982 session->state = ISCSI_STATE_TERMINATE;
1983 wake_up(&conn->ehwait);
1984 }
1985 spin_unlock_bh(&session->lock);
1986
7996a778
MC		 1987 /*
1988 * Block until all in-progress commands for this connection
1989 * time out or fail.
1990 */
1991 for (;;) {
1992 spin_lock_irqsave(session->host->host_lock, flags);
1993 if (!session->host->host_busy) { /* OK for ERL == 0 */
1994 spin_unlock_irqrestore(session->host->host_lock, flags);
1995 break;
1996 }
1997 spin_unlock_irqrestore(session->host->host_lock, flags);
1998 msleep_interruptible(500);
322d739d
MC		 1999 iscsi_conn_printk(KERN_INFO, conn, "iscsi conn_destroy(): "
2000 "host_busy %d host_failed %d\n",
2001 session->host->host_busy,
2002 session->host->host_failed);
7996a778
MC		 2003 /*
2004 * force eh_abort() to unblock
2005 */
2006 wake_up(&conn->ehwait);
2007 }
2008
779ea120 2009 /* flush queued up work because we free the connection below */
843c0a8a 2010 iscsi_suspend_tx(conn);
779ea120 2011
7996a778 2012 spin_lock_bh(&session->lock);
c8dc1e52 2013 kfree(conn->data);
f3ff0c36 2014 kfree(conn->persistent_address);
7996a778
MC		 2015 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
2016 sizeof(void*));
e0726407 2017 if (session->leadconn == conn)
7996a778 2018 session->leadconn = NULL;
7996a778
MC		 2019 spin_unlock_bh(&session->lock);
2020
7996a778
MC		 2021 iscsi_destroy_conn(cls_conn);
2022}
2023EXPORT_SYMBOL_GPL(iscsi_conn_teardown);
2024
2025int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
2026{
2027 struct iscsi_conn *conn = cls_conn->dd_data;
2028 struct iscsi_session *session = conn->session;
2029
ffd0436e 2030 if (!session) {
322d739d
MC		 2031 iscsi_conn_printk(KERN_ERR, conn,
2032 "can't start unbound connection\n");
7996a778
MC		 2033 return -EPERM;
2034 }
2035
db98ccde
MC		 2036 if ((session->imm_data_en || !session->initial_r2t_en) &&
2037 session->first_burst > session->max_burst) {
322d739d
MC		 2038 iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: "
2039 "first_burst %d max_burst %d\n",
2040 session->first_burst, session->max_burst);
ffd0436e
MC		 2041 return -EINVAL;
2042 }
2043
f6d5180c 2044 if (conn->ping_timeout && !conn->recv_timeout) {
322d739d
MC		 2045 iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of "
2046 "zero. Using 5 seconds\n.");
f6d5180c
MC		 2047 conn->recv_timeout = 5;
2048 }
2049
2050 if (conn->recv_timeout && !conn->ping_timeout) {
322d739d
MC		 2051 iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of "
2052 "zero. Using 5 seconds.\n");
f6d5180c
MC		 2053 conn->ping_timeout = 5;
2054 }
2055
7996a778
MC		 2056 spin_lock_bh(&session->lock);
2057 conn->c_stage = ISCSI_CONN_STARTED;
2058 session->state = ISCSI_STATE_LOGGED_IN;
e0726407 2059 session->queued_cmdsn = session->cmdsn;
7996a778 2060
f6d5180c
MC		 2061 conn->last_recv = jiffies;
2062 conn->last_ping = jiffies;
2063 if (conn->recv_timeout && conn->ping_timeout)
2064 mod_timer(&conn->transport_timer,
2065 jiffies + (conn->recv_timeout * HZ));
2066
7996a778
MC		 2067 switch(conn->stop_stage) {
2068 case STOP_CONN_RECOVER:
2069 /*
2070 * unblock eh_abort() if it is blocked. re-try all
2071 * commands after successful recovery
2072 */
7996a778 2073 conn->stop_stage = 0;
843c0a8a 2074 conn->tmf_state = TMF_INITIAL;
7996a778 2075 session->age++;
8b1d0343
MC		 2076 if (session->age == 16)
2077 session->age = 0;
6eabafbe 2078 break;
7996a778 2079 case STOP_CONN_TERM:
7996a778 2080 conn->stop_stage = 0;
7996a778
MC		 2081 break;
2082 default:
2083 break;
2084 }
2085 spin_unlock_bh(&session->lock);
2086
6eabafbe
MC		 2087 iscsi_unblock_session(session_to_cls(session));
2088 wake_up(&conn->ehwait);
7996a778
MC		 2089 return 0;
2090}
2091EXPORT_SYMBOL_GPL(iscsi_conn_start);
2092
2093static void
2094flush_control_queues(struct iscsi_session *session, struct iscsi_conn *conn)
2095{
2096 struct iscsi_mgmt_task *mtask, *tmp;
2097
2098 /* handle pending */
843c0a8a
MC		 2099 list_for_each_entry_safe(mtask, tmp, &conn->mgmtqueue, running) {
2100 debug_scsi("flushing pending mgmt task itt 0x%x\n", mtask->itt);
b3a7ea8d 2101 iscsi_free_mgmt_task(conn, mtask);
7996a778
MC		 2102 }
2103
2104 /* handle running */
2105 list_for_each_entry_safe(mtask, tmp, &conn->mgmt_run_list, running) {
2106 debug_scsi("flushing running mgmt task itt 0x%x\n", mtask->itt);
b3a7ea8d 2107 iscsi_free_mgmt_task(conn, mtask);
7996a778
MC		 2108 }
2109
2110 conn->mtask = NULL;
2111}
2112
656cffc9
MC		 2113static void iscsi_start_session_recovery(struct iscsi_session *session,
2114 struct iscsi_conn *conn, int flag)
7996a778 2115{
ed2abc7f
MC		 2116 int old_stop_stage;
2117
f6d5180c
MC		 2118 del_timer_sync(&conn->transport_timer);
2119
6724add1 2120 mutex_lock(&session->eh_mutex);
7996a778 2121 spin_lock_bh(&session->lock);
ed2abc7f 2122 if (conn->stop_stage == STOP_CONN_TERM) {
7996a778 2123 spin_unlock_bh(&session->lock);
6724add1
MC		 2124 mutex_unlock(&session->eh_mutex);
2125 return;
2126 }
2127
2128 /*
2129 * The LLD either freed/unset the lock on us, or userspace called
2130 * stop but did not create a proper connection (connection was never
2131 * bound or it was unbound then stop was called).
2132 */
2133 if (!conn->recv_lock) {
2134 spin_unlock_bh(&session->lock);
2135 mutex_unlock(&session->eh_mutex);
7996a778
MC		 2136 return;
2137 }
ed2abc7f
MC		 2138
2139 /*
2140 * When this is called for the in_login state, we only want to clean
67a61114
MC		 2141 * up the login task and connection. We do not need to block and set
2142 * the recovery state again
ed2abc7f 2143 */
67a61114
MC		 2144 if (flag == STOP_CONN_TERM)
2145 session->state = ISCSI_STATE_TERMINATE;
2146 else if (conn->stop_stage != STOP_CONN_RECOVER)
2147 session->state = ISCSI_STATE_IN_RECOVERY;
ed2abc7f
MC		 2148
2149 old_stop_stage = conn->stop_stage;
7996a778 2150 conn->stop_stage = flag;
67a61114 2151 conn->c_stage = ISCSI_CONN_STOPPED;
7996a778 2152 spin_unlock_bh(&session->lock);
6724add1
MC		 2153
2154 iscsi_suspend_tx(conn);
7996a778 2155
1c83469d
MC		 2156 write_lock_bh(conn->recv_lock);
2157 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
2158 write_unlock_bh(conn->recv_lock);
7996a778 2159
7996a778
MC		 2160 /*
2161 * for connection level recovery we should not calculate
2162 * header digest. conn->hdr_size used for optimization
2163 * in hdr_extract() and will be re-negotiated at
2164 * set_param() time.
2165 */
2166 if (flag == STOP_CONN_RECOVER) {
2167 conn->hdrdgst_en = 0;
2168 conn->datadgst_en = 0;
656cffc9 2169 if (session->state == ISCSI_STATE_IN_RECOVERY &&
67a61114
MC		 2170 old_stop_stage != STOP_CONN_RECOVER) {
2171 debug_scsi("blocking session\n");
7996a778 2172 iscsi_block_session(session_to_cls(session));
67a61114 2173 }
7996a778 2174 }
656cffc9 2175
656cffc9
MC		 2176 /*
2177 * flush queues.
2178 */
2179 spin_lock_bh(&session->lock);
6eabafbe
MC		 2180 fail_all_commands(conn, -1,
2181 STOP_CONN_RECOVER ? DID_BUS_BUSY : DID_ERROR);
656cffc9
MC		 2182 flush_control_queues(session, conn);
2183 spin_unlock_bh(&session->lock);
6724add1 2184 mutex_unlock(&session->eh_mutex);
7996a778 2185}
7996a778
MC		 2186
2187void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
2188{
2189 struct iscsi_conn *conn = cls_conn->dd_data;
2190 struct iscsi_session *session = conn->session;
2191
2192 switch (flag) {
2193 case STOP_CONN_RECOVER:
2194 case STOP_CONN_TERM:
2195 iscsi_start_session_recovery(session, conn, flag);
8d2860b3 2196 break;
7996a778 2197 default:
322d739d
MC		 2198 iscsi_conn_printk(KERN_ERR, conn,
2199 "invalid stop flag %d\n", flag);
7996a778
MC		 2200 }
2201}
2202EXPORT_SYMBOL_GPL(iscsi_conn_stop);
2203
2204int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
2205 struct iscsi_cls_conn *cls_conn, int is_leading)
2206{
2207 struct iscsi_session *session = class_to_transport_session(cls_session);
98644047 2208 struct iscsi_conn *conn = cls_conn->dd_data;
7996a778 2209
7996a778 2210 spin_lock_bh(&session->lock);
7996a778
MC		 2211 if (is_leading)
2212 session->leadconn = conn;
98644047 2213 spin_unlock_bh(&session->lock);
7996a778
MC		 2214
2215 /*
2216 * Unblock xmitworker(), Login Phase will pass through.
2217 */
2218 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
2219 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
2220 return 0;
2221}
2222EXPORT_SYMBOL_GPL(iscsi_conn_bind);
2223
a54a52ca
MC		 2224
2225int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
2226 enum iscsi_param param, char *buf, int buflen)
2227{
2228 struct iscsi_conn *conn = cls_conn->dd_data;
2229 struct iscsi_session *session = conn->session;
2230 uint32_t value;
2231
2232 switch(param) {
843c0a8a
MC		 2233 case ISCSI_PARAM_FAST_ABORT:
2234 sscanf(buf, "%d", &session->fast_abort);
2235 break;
f6d5180c
MC		 2236 case ISCSI_PARAM_ABORT_TMO:
2237 sscanf(buf, "%d", &session->abort_timeout);
2238 break;
2239 case ISCSI_PARAM_LU_RESET_TMO:
2240 sscanf(buf, "%d", &session->lu_reset_timeout);
2241 break;
2242 case ISCSI_PARAM_PING_TMO:
2243 sscanf(buf, "%d", &conn->ping_timeout);
2244 break;
2245 case ISCSI_PARAM_RECV_TMO:
2246 sscanf(buf, "%d", &conn->recv_timeout);
2247 break;
a54a52ca
MC		 2248 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2249 sscanf(buf, "%d", &conn->max_recv_dlength);
2250 break;
2251 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2252 sscanf(buf, "%d", &conn->max_xmit_dlength);
2253 break;
2254 case ISCSI_PARAM_HDRDGST_EN:
2255 sscanf(buf, "%d", &conn->hdrdgst_en);
2256 break;
2257 case ISCSI_PARAM_DATADGST_EN:
2258 sscanf(buf, "%d", &conn->datadgst_en);
2259 break;
2260 case ISCSI_PARAM_INITIAL_R2T_EN:
2261 sscanf(buf, "%d", &session->initial_r2t_en);
2262 break;
2263 case ISCSI_PARAM_MAX_R2T:
2264 sscanf(buf, "%d", &session->max_r2t);
2265 break;
2266 case ISCSI_PARAM_IMM_DATA_EN:
2267 sscanf(buf, "%d", &session->imm_data_en);
2268 break;
2269 case ISCSI_PARAM_FIRST_BURST:
2270 sscanf(buf, "%d", &session->first_burst);
2271 break;
2272 case ISCSI_PARAM_MAX_BURST:
2273 sscanf(buf, "%d", &session->max_burst);
2274 break;
2275 case ISCSI_PARAM_PDU_INORDER_EN:
2276 sscanf(buf, "%d", &session->pdu_inorder_en);
2277 break;
2278 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2279 sscanf(buf, "%d", &session->dataseq_inorder_en);
2280 break;
2281 case ISCSI_PARAM_ERL:
2282 sscanf(buf, "%d", &session->erl);
2283 break;
2284 case ISCSI_PARAM_IFMARKER_EN:
2285 sscanf(buf, "%d", &value);
2286 BUG_ON(value);
2287 break;
2288 case ISCSI_PARAM_OFMARKER_EN:
2289 sscanf(buf, "%d", &value);
2290 BUG_ON(value);
2291 break;
2292 case ISCSI_PARAM_EXP_STATSN:
2293 sscanf(buf, "%u", &conn->exp_statsn);
2294 break;
b2c64167
MC		 2295 case ISCSI_PARAM_USERNAME:
2296 kfree(session->username);
2297 session->username = kstrdup(buf, GFP_KERNEL);
2298 if (!session->username)
2299 return -ENOMEM;
2300 break;
2301 case ISCSI_PARAM_USERNAME_IN:
2302 kfree(session->username_in);
2303 session->username_in = kstrdup(buf, GFP_KERNEL);
2304 if (!session->username_in)
2305 return -ENOMEM;
2306 break;
2307 case ISCSI_PARAM_PASSWORD:
2308 kfree(session->password);
2309 session->password = kstrdup(buf, GFP_KERNEL);
2310 if (!session->password)
2311 return -ENOMEM;
2312 break;
2313 case ISCSI_PARAM_PASSWORD_IN:
2314 kfree(session->password_in);
2315 session->password_in = kstrdup(buf, GFP_KERNEL);
2316 if (!session->password_in)
2317 return -ENOMEM;
2318 break;
a54a52ca
MC		 2319 case ISCSI_PARAM_TARGET_NAME:
2320 /* this should not change between logins */
2321 if (session->targetname)
2322 break;
2323
2324 session->targetname = kstrdup(buf, GFP_KERNEL);
2325 if (!session->targetname)
2326 return -ENOMEM;
2327 break;
2328 case ISCSI_PARAM_TPGT:
2329 sscanf(buf, "%d", &session->tpgt);
2330 break;
2331 case ISCSI_PARAM_PERSISTENT_PORT:
2332 sscanf(buf, "%d", &conn->persistent_port);
2333 break;
2334 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2335 /*
2336 * this is the address returned in discovery so it should
2337 * not change between logins.
2338 */
2339 if (conn->persistent_address)
2340 break;
2341
2342 conn->persistent_address = kstrdup(buf, GFP_KERNEL);
2343 if (!conn->persistent_address)
2344 return -ENOMEM;
2345 break;
2346 default:
2347 return -ENOSYS;
2348 }
2349
2350 return 0;
2351}
2352EXPORT_SYMBOL_GPL(iscsi_set_param);
2353
2354int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
2355 enum iscsi_param param, char *buf)
2356{
2357 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
2358 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
2359 int len;
2360
2361 switch(param) {
843c0a8a
MC		 2362 case ISCSI_PARAM_FAST_ABORT:
2363 len = sprintf(buf, "%d\n", session->fast_abort);
2364 break;
f6d5180c
MC		 2365 case ISCSI_PARAM_ABORT_TMO:
2366 len = sprintf(buf, "%d\n", session->abort_timeout);
2367 break;
2368 case ISCSI_PARAM_LU_RESET_TMO:
2369 len = sprintf(buf, "%d\n", session->lu_reset_timeout);
2370 break;
a54a52ca
MC		 2371 case ISCSI_PARAM_INITIAL_R2T_EN:
2372 len = sprintf(buf, "%d\n", session->initial_r2t_en);
2373 break;
2374 case ISCSI_PARAM_MAX_R2T:
2375 len = sprintf(buf, "%hu\n", session->max_r2t);
2376 break;
2377 case ISCSI_PARAM_IMM_DATA_EN:
2378 len = sprintf(buf, "%d\n", session->imm_data_en);
2379 break;
2380 case ISCSI_PARAM_FIRST_BURST:
2381 len = sprintf(buf, "%u\n", session->first_burst);
2382 break;
2383 case ISCSI_PARAM_MAX_BURST:
2384 len = sprintf(buf, "%u\n", session->max_burst);
2385 break;
2386 case ISCSI_PARAM_PDU_INORDER_EN:
2387 len = sprintf(buf, "%d\n", session->pdu_inorder_en);
2388 break;
2389 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2390 len = sprintf(buf, "%d\n", session->dataseq_inorder_en);
2391 break;
2392 case ISCSI_PARAM_ERL:
2393 len = sprintf(buf, "%d\n", session->erl);
2394 break;
2395 case ISCSI_PARAM_TARGET_NAME:
2396 len = sprintf(buf, "%s\n", session->targetname);
2397 break;
2398 case ISCSI_PARAM_TPGT:
2399 len = sprintf(buf, "%d\n", session->tpgt);
2400 break;
b2c64167
MC		 2401 case ISCSI_PARAM_USERNAME:
2402 len = sprintf(buf, "%s\n", session->username);
2403 break;
2404 case ISCSI_PARAM_USERNAME_IN:
2405 len = sprintf(buf, "%s\n", session->username_in);
2406 break;
2407 case ISCSI_PARAM_PASSWORD:
2408 len = sprintf(buf, "%s\n", session->password);
2409 break;
2410 case ISCSI_PARAM_PASSWORD_IN:
2411 len = sprintf(buf, "%s\n", session->password_in);
2412 break;
a54a52ca
MC		 2413 default:
2414 return -ENOSYS;
2415 }
2416
2417 return len;
2418}
2419EXPORT_SYMBOL_GPL(iscsi_session_get_param);
2420
2421int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
2422 enum iscsi_param param, char *buf)
2423{
2424 struct iscsi_conn *conn = cls_conn->dd_data;
2425 int len;
2426
2427 switch(param) {
f6d5180c
MC		 2428 case ISCSI_PARAM_PING_TMO:
2429 len = sprintf(buf, "%u\n", conn->ping_timeout);
2430 break;
2431 case ISCSI_PARAM_RECV_TMO:
2432 len = sprintf(buf, "%u\n", conn->recv_timeout);
2433 break;
a54a52ca
MC		 2434 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2435 len = sprintf(buf, "%u\n", conn->max_recv_dlength);
2436 break;
2437 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2438 len = sprintf(buf, "%u\n", conn->max_xmit_dlength);
2439 break;
2440 case ISCSI_PARAM_HDRDGST_EN:
2441 len = sprintf(buf, "%d\n", conn->hdrdgst_en);
2442 break;
2443 case ISCSI_PARAM_DATADGST_EN:
2444 len = sprintf(buf, "%d\n", conn->datadgst_en);
2445 break;
2446 case ISCSI_PARAM_IFMARKER_EN:
2447 len = sprintf(buf, "%d\n", conn->ifmarker_en);
2448 break;
2449 case ISCSI_PARAM_OFMARKER_EN:
2450 len = sprintf(buf, "%d\n", conn->ofmarker_en);
2451 break;
2452 case ISCSI_PARAM_EXP_STATSN:
2453 len = sprintf(buf, "%u\n", conn->exp_statsn);
2454 break;
2455 case ISCSI_PARAM_PERSISTENT_PORT:
2456 len = sprintf(buf, "%d\n", conn->persistent_port);
2457 break;
2458 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2459 len = sprintf(buf, "%s\n", conn->persistent_address);
2460 break;
2461 default:
2462 return -ENOSYS;
2463 }
2464
2465 return len;
2466}
2467EXPORT_SYMBOL_GPL(iscsi_conn_get_param);
2468
0801c242
MC		 2469int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2470 char *buf)
2471{
2472 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
2473 int len;
2474
2475 switch (param) {
d8196ed2
MC		 2476 case ISCSI_HOST_PARAM_NETDEV_NAME:
2477 if (!session->netdev)
2478 len = sprintf(buf, "%s\n", "default");
2479 else
2480 len = sprintf(buf, "%s\n", session->netdev);
2481 break;
0801c242
MC		 2482 case ISCSI_HOST_PARAM_HWADDRESS:
2483 if (!session->hwaddress)
2484 len = sprintf(buf, "%s\n", "default");
2485 else
2486 len = sprintf(buf, "%s\n", session->hwaddress);
2487 break;
8ad5781a
MC		 2488 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2489 if (!session->initiatorname)
2490 len = sprintf(buf, "%s\n", "unknown");
2491 else
2492 len = sprintf(buf, "%s\n", session->initiatorname);
2493 break;
2494
0801c242
MC		 2495 default:
2496 return -ENOSYS;
2497 }
2498
2499 return len;
2500}
2501EXPORT_SYMBOL_GPL(iscsi_host_get_param);
2502
2503int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2504 char *buf, int buflen)
2505{
2506 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
2507
2508 switch (param) {
d8196ed2
MC		 2509 case ISCSI_HOST_PARAM_NETDEV_NAME:
2510 if (!session->netdev)
2511 session->netdev = kstrdup(buf, GFP_KERNEL);
2512 break;
0801c242
MC		 2513 case ISCSI_HOST_PARAM_HWADDRESS:
2514 if (!session->hwaddress)
2515 session->hwaddress = kstrdup(buf, GFP_KERNEL);
2516 break;
8ad5781a
MC		 2517 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2518 if (!session->initiatorname)
2519 session->initiatorname = kstrdup(buf, GFP_KERNEL);
2520 break;
0801c242
MC		 2521 default:
2522 return -ENOSYS;
2523 }
2524
2525 return 0;
2526}
2527EXPORT_SYMBOL_GPL(iscsi_host_set_param);
2528
7996a778
MC		 2529MODULE_AUTHOR("Mike Christie");
2530MODULE_DESCRIPTION("iSCSI library functions");
2531MODULE_LICENSE("GPL");
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