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[SCSI] libiscsi: Do not fail commands immediately during logout
[net-next-2.6.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>
8eb00539 27#include <asm/unaligned.h>
7996a778
MC		 28#include <net/tcp.h>
29#include <scsi/scsi_cmnd.h>
30#include <scsi/scsi_device.h>
31#include <scsi/scsi_eh.h>
32#include <scsi/scsi_tcq.h>
33#include <scsi/scsi_host.h>
34#include <scsi/scsi.h>
35#include <scsi/iscsi_proto.h>
36#include <scsi/scsi_transport.h>
37#include <scsi/scsi_transport_iscsi.h>
38#include <scsi/libiscsi.h>
39
40struct iscsi_session *
41class_to_transport_session(struct iscsi_cls_session *cls_session)
42{
43 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
44 return iscsi_hostdata(shost->hostdata);
45}
46EXPORT_SYMBOL_GPL(class_to_transport_session);
47
77a23c21
MC		 48/* Serial Number Arithmetic, 32 bits, less than, RFC1982 */
49#define SNA32_CHECK 2147483648UL
7996a778 50
77a23c21
MC		 51static int iscsi_sna_lt(u32 n1, u32 n2)
52{
53 return n1 != n2 && ((n1 < n2 && (n2 - n1 < SNA32_CHECK)) ||
54 (n1 > n2 && (n2 - n1 < SNA32_CHECK)));
55}
56
57/* Serial Number Arithmetic, 32 bits, less than, RFC1982 */
58static int iscsi_sna_lte(u32 n1, u32 n2)
59{
60 return n1 == n2 || ((n1 < n2 && (n2 - n1 < SNA32_CHECK)) ||
61 (n1 > n2 && (n2 - n1 < SNA32_CHECK)));
62}
63
64void
65iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr)
7996a778
MC		 66{
67 uint32_t max_cmdsn = be32_to_cpu(hdr->max_cmdsn);
68 uint32_t exp_cmdsn = be32_to_cpu(hdr->exp_cmdsn);
69
77a23c21
MC		 70 /*
71 * standard specifies this check for when to update expected and
72 * max sequence numbers
73 */
74 if (iscsi_sna_lt(max_cmdsn, exp_cmdsn - 1))
75 return;
76
77 if (exp_cmdsn != session->exp_cmdsn &&
78 !iscsi_sna_lt(exp_cmdsn, session->exp_cmdsn))
7996a778
MC		 79 session->exp_cmdsn = exp_cmdsn;
80
77a23c21
MC		 81 if (max_cmdsn != session->max_cmdsn &&
82 !iscsi_sna_lt(max_cmdsn, session->max_cmdsn)) {
83 session->max_cmdsn = max_cmdsn;
84 /*
85 * if the window closed with IO queued, then kick the
86 * xmit thread
87 */
88 if (!list_empty(&session->leadconn->xmitqueue) ||
843c0a8a 89 !list_empty(&session->leadconn->mgmtqueue))
77a23c21
MC		 90 scsi_queue_work(session->host,
91 &session->leadconn->xmitwork);
92 }
7996a778 93}
77a23c21 94EXPORT_SYMBOL_GPL(iscsi_update_cmdsn);
7996a778
MC		 95
96void iscsi_prep_unsolicit_data_pdu(struct iscsi_cmd_task *ctask,
ffd0436e 97 struct iscsi_data *hdr)
7996a778
MC		 98{
99 struct iscsi_conn *conn = ctask->conn;
100
101 memset(hdr, 0, sizeof(struct iscsi_data));
102 hdr->ttt = cpu_to_be32(ISCSI_RESERVED_TAG);
103 hdr->datasn = cpu_to_be32(ctask->unsol_datasn);
104 ctask->unsol_datasn++;
105 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
106 memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
107
108 hdr->itt = ctask->hdr->itt;
109 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
ffd0436e 110 hdr->offset = cpu_to_be32(ctask->unsol_offset);
7996a778
MC		 111
112 if (ctask->unsol_count > conn->max_xmit_dlength) {
113 hton24(hdr->dlength, conn->max_xmit_dlength);
114 ctask->data_count = conn->max_xmit_dlength;
ffd0436e 115 ctask->unsol_offset += ctask->data_count;
7996a778
MC		 116 hdr->flags = 0;
117 } else {
118 hton24(hdr->dlength, ctask->unsol_count);
119 ctask->data_count = ctask->unsol_count;
120 hdr->flags = ISCSI_FLAG_CMD_FINAL;
121 }
122}
123EXPORT_SYMBOL_GPL(iscsi_prep_unsolicit_data_pdu);
124
004d6530
BH		 125static int iscsi_add_hdr(struct iscsi_cmd_task *ctask, unsigned len)
126{
127 unsigned exp_len = ctask->hdr_len + len;
128
129 if (exp_len > ctask->hdr_max) {
130 WARN_ON(1);
131 return -EINVAL;
132 }
133
134 WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */
135 ctask->hdr_len = exp_len;
136 return 0;
137}
138
7996a778
MC		 139/**
140 * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
141 * @ctask: iscsi cmd task
142 *
143 * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set
144 * fields like dlength or final based on how much data it sends
145 */
004d6530 146static int iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask)
7996a778
MC		 147{
148 struct iscsi_conn *conn = ctask->conn;
149 struct iscsi_session *session = conn->session;
150 struct iscsi_cmd *hdr = ctask->hdr;
151 struct scsi_cmnd *sc = ctask->sc;
004d6530
BH		 152 unsigned hdrlength;
153 int rc;
7996a778 154
004d6530
BH		 155 ctask->hdr_len = 0;
156 rc = iscsi_add_hdr(ctask, sizeof(*hdr));
157 if (rc)
158 return rc;
7996a778
MC		 159 hdr->opcode = ISCSI_OP_SCSI_CMD;
160 hdr->flags = ISCSI_ATTR_SIMPLE;
161 int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun);
b4377356 162 hdr->itt = build_itt(ctask->itt, conn->id, session->age);
1c138991 163 hdr->data_length = cpu_to_be32(scsi_bufflen(sc));
7996a778
MC		 164 hdr->cmdsn = cpu_to_be32(session->cmdsn);
165 session->cmdsn++;
166 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
167 memcpy(hdr->cdb, sc->cmnd, sc->cmd_len);
d473cc7f
MC		 168 if (sc->cmd_len < MAX_COMMAND_SIZE)
169 memset(&hdr->cdb[sc->cmd_len], 0,
170 MAX_COMMAND_SIZE - sc->cmd_len);
7996a778 171
ffd0436e 172 ctask->data_count = 0;
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
MC		 200 conn->max_xmit_dlength);
201 hton24(ctask->hdr->dlength, ctask->imm_count);
202 } else
203 zero_data(ctask->hdr->dlength);
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 */
213 ctask->hdr->flags |= ISCSI_FLAG_CMD_FINAL;
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
7996a778 231 conn->scsicmd_pdus_cnt++;
77a23c21
MC		 232
233 debug_scsi("iscsi prep [%s cid %d sc %p cdb 0x%x itt 0x%x len %d "
234 "cmdsn %d win %d]\n",
235 sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read",
1c138991 236 conn->id, sc, sc->cmnd[0], ctask->itt, scsi_bufflen(sc),
77a23c21 237 session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1);
004d6530 238 return 0;
7996a778 239}
7996a778
MC		 240
241/**
242 * iscsi_complete_command - return command back to scsi-ml
7996a778
MC		 243 * @ctask: iscsi cmd task
244 *
245 * Must be called with session lock.
246 * This function returns the scsi command to scsi-ml and returns
247 * the cmd task to the pool of available cmd tasks.
248 */
60ecebf5 249static void iscsi_complete_command(struct iscsi_cmd_task *ctask)
7996a778 250{
60ecebf5 251 struct iscsi_session *session = ctask->conn->session;
7996a778
MC		 252 struct scsi_cmnd *sc = ctask->sc;
253
b6c395ed 254 ctask->state = ISCSI_TASK_COMPLETED;
7996a778 255 ctask->sc = NULL;
f47f2cf5
MC		 256 /* SCSI eh reuses commands to verify us */
257 sc->SCp.ptr = NULL;
7996a778
MC		 258 list_del_init(&ctask->running);
259 __kfifo_put(session->cmdpool.queue, (void*)&ctask, sizeof(void*));
260 sc->scsi_done(sc);
261}
262
60ecebf5
MC		 263static void __iscsi_get_ctask(struct iscsi_cmd_task *ctask)
264{
265 atomic_inc(&ctask->refcount);
266}
267
60ecebf5
MC		 268static void __iscsi_put_ctask(struct iscsi_cmd_task *ctask)
269{
e648f63c 270 if (atomic_dec_and_test(&ctask->refcount))
60ecebf5 271 iscsi_complete_command(ctask);
60ecebf5
MC		 272}
273
b3a7ea8d
MC		 274/*
275 * session lock must be held
276 */
277static void fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
278 int err)
279{
280 struct scsi_cmnd *sc;
281
282 sc = ctask->sc;
283 if (!sc)
284 return;
285
286 if (ctask->state == ISCSI_TASK_PENDING)
287 /*
288 * cmd never made it to the xmit thread, so we should not count
289 * the cmd in the sequencing
290 */
291 conn->session->queued_cmdsn--;
292 else
293 conn->session->tt->cleanup_cmd_task(conn, ctask);
294
295 sc->result = err;
296 scsi_set_resid(sc, scsi_bufflen(sc));
297 if (conn->ctask == ctask)
298 conn->ctask = NULL;
299 /* release ref from queuecommand */
300 __iscsi_put_ctask(ctask);
301}
302
303/**
304 * iscsi_free_mgmt_task - return mgmt task back to pool
305 * @conn: iscsi connection
306 * @mtask: mtask
307 *
308 * Must be called with session lock.
309 */
310void iscsi_free_mgmt_task(struct iscsi_conn *conn,
311 struct iscsi_mgmt_task *mtask)
312{
313 list_del_init(&mtask->running);
314 if (conn->login_mtask == mtask)
315 return;
f6d5180c
MC		 316
317 if (conn->ping_mtask == mtask)
318 conn->ping_mtask = NULL;
b3a7ea8d
MC		 319 __kfifo_put(conn->session->mgmtpool.queue,
320 (void*)&mtask, sizeof(void*));
321}
322EXPORT_SYMBOL_GPL(iscsi_free_mgmt_task);
323
f6d5180c
MC		 324static struct iscsi_mgmt_task *
325__iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
326 char *data, uint32_t data_size)
327{
328 struct iscsi_session *session = conn->session;
329 struct iscsi_mgmt_task *mtask;
330
331 if (session->state == ISCSI_STATE_TERMINATE)
332 return NULL;
333
334 if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) ||
335 hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
336 /*
337 * Login and Text are sent serially, in
338 * request-followed-by-response sequence.
339 * Same mtask can be used. Same ITT must be used.
340 * Note that login_mtask is preallocated at conn_create().
341 */
342 mtask = conn->login_mtask;
343 else {
344 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
345 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
346
347 if (!__kfifo_get(session->mgmtpool.queue,
348 (void*)&mtask, sizeof(void*)))
349 return NULL;
350 }
351
352 if (data_size) {
353 memcpy(mtask->data, data, data_size);
354 mtask->data_count = data_size;
355 } else
356 mtask->data_count = 0;
357
358 memcpy(mtask->hdr, hdr, sizeof(struct iscsi_hdr));
359 INIT_LIST_HEAD(&mtask->running);
360 list_add_tail(&mtask->running, &conn->mgmtqueue);
361 return mtask;
362}
363
364int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr,
365 char *data, uint32_t data_size)
366{
367 struct iscsi_conn *conn = cls_conn->dd_data;
368 struct iscsi_session *session = conn->session;
369 int err = 0;
370
371 spin_lock_bh(&session->lock);
372 if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size))
373 err = -EPERM;
374 spin_unlock_bh(&session->lock);
375 scsi_queue_work(session->host, &conn->xmitwork);
376 return err;
377}
378EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu);
379
7996a778
MC		 380/**
381 * iscsi_cmd_rsp - SCSI Command Response processing
382 * @conn: iscsi connection
383 * @hdr: iscsi header
384 * @ctask: scsi command task
385 * @data: cmd data buffer
386 * @datalen: len of buffer
387 *
388 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and
389 * then completes the command and task.
390 **/
77a23c21
MC		 391static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
392 struct iscsi_cmd_task *ctask, char *data,
393 int datalen)
7996a778 394{
7996a778
MC		 395 struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)hdr;
396 struct iscsi_session *session = conn->session;
397 struct scsi_cmnd *sc = ctask->sc;
398
77a23c21 399 iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr);
7996a778
MC		 400 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
401
402 sc->result = (DID_OK << 16) | rhdr->cmd_status;
403
404 if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) {
405 sc->result = DID_ERROR << 16;
406 goto out;
407 }
408
409 if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) {
9b80cb4b 410 uint16_t senselen;
7996a778
MC		 411
412 if (datalen < 2) {
413invalid_datalen:
be2df72e
OG		 414 printk(KERN_ERR "iscsi: Got CHECK_CONDITION but "
415 "invalid data buffer size of %d\n", datalen);
7996a778
MC		 416 sc->result = DID_BAD_TARGET << 16;
417 goto out;
418 }
419
8eb00539 420 senselen = be16_to_cpu(get_unaligned((__be16 *) data));
7996a778
MC		 421 if (datalen < senselen)
422 goto invalid_datalen;
423
424 memcpy(sc->sense_buffer, data + 2,
9b80cb4b 425 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
7996a778 426 debug_scsi("copied %d bytes of sense\n",
8eb00539 427 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
7996a778
MC		 428 }
429
7207fea4
BH		 430 if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW |
431 ISCSI_FLAG_CMD_OVERFLOW)) {
7996a778
MC		 432 int res_count = be32_to_cpu(rhdr->residual_count);
433
7207fea4
BH		 434 if (res_count > 0 &&
435 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
436 res_count <= scsi_bufflen(sc)))
1c138991 437 scsi_set_resid(sc, res_count);
7996a778
MC		 438 else
439 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
7207fea4
BH		 440 } else if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW |
441 ISCSI_FLAG_CMD_BIDI_OVERFLOW))
7996a778 442 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
7996a778
MC		 443
444out:
445 debug_scsi("done [sc %lx res %d itt 0x%x]\n",
446 (long)sc, sc->result, ctask->itt);
447 conn->scsirsp_pdus_cnt++;
448
60ecebf5 449 __iscsi_put_ctask(ctask);
7996a778
MC		 450}
451
7ea8b828
MC		 452static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
453{
454 struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr;
455
456 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
457 conn->tmfrsp_pdus_cnt++;
458
843c0a8a 459 if (conn->tmf_state != TMF_QUEUED)
7ea8b828
MC		 460 return;
461
462 if (tmf->response == ISCSI_TMF_RSP_COMPLETE)
843c0a8a 463 conn->tmf_state = TMF_SUCCESS;
7ea8b828 464 else if (tmf->response == ISCSI_TMF_RSP_NO_TASK)
843c0a8a 465 conn->tmf_state = TMF_NOT_FOUND;
7ea8b828 466 else
843c0a8a 467 conn->tmf_state = TMF_FAILED;
7ea8b828
MC		 468 wake_up(&conn->ehwait);
469}
470
f6d5180c
MC		 471static void iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr)
472{
473 struct iscsi_nopout hdr;
474 struct iscsi_mgmt_task *mtask;
475
476 if (!rhdr && conn->ping_mtask)
477 return;
478
479 memset(&hdr, 0, sizeof(struct iscsi_nopout));
480 hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE;
481 hdr.flags = ISCSI_FLAG_CMD_FINAL;
482
483 if (rhdr) {
484 memcpy(hdr.lun, rhdr->lun, 8);
485 hdr.ttt = rhdr->ttt;
486 hdr.itt = RESERVED_ITT;
487 } else
488 hdr.ttt = RESERVED_ITT;
489
490 mtask = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0);
491 if (!mtask) {
492 printk(KERN_ERR "Could not send nopout\n");
493 return;
494 }
495
496 /* only track our nops */
497 if (!rhdr) {
498 conn->ping_mtask = mtask;
499 conn->last_ping = jiffies;
500 }
501 scsi_queue_work(conn->session->host, &conn->xmitwork);
502}
503
62f38300
MC		 504static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
505 char *data, int datalen)
506{
507 struct iscsi_reject *reject = (struct iscsi_reject *)hdr;
508 struct iscsi_hdr rejected_pdu;
509 uint32_t itt;
510
511 conn->exp_statsn = be32_to_cpu(reject->statsn) + 1;
512
513 if (reject->reason == ISCSI_REASON_DATA_DIGEST_ERROR) {
514 if (ntoh24(reject->dlength) > datalen)
515 return ISCSI_ERR_PROTO;
516
517 if (ntoh24(reject->dlength) >= sizeof(struct iscsi_hdr)) {
518 memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr));
b4377356 519 itt = get_itt(rejected_pdu.itt);
62f38300
MC		 520 printk(KERN_ERR "itt 0x%x had pdu (op 0x%x) rejected "
521 "due to DataDigest error.\n", itt,
522 rejected_pdu.opcode);
523 }
524 }
525 return 0;
526}
527
7996a778
MC		 528/**
529 * __iscsi_complete_pdu - complete pdu
530 * @conn: iscsi conn
531 * @hdr: iscsi header
532 * @data: data buffer
533 * @datalen: len of data buffer
534 *
535 * Completes pdu processing by freeing any resources allocated at
536 * queuecommand or send generic. session lock must be held and verify
537 * itt must have been called.
538 */
539int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
540 char *data, int datalen)
541{
542 struct iscsi_session *session = conn->session;
543 int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0;
544 struct iscsi_cmd_task *ctask;
545 struct iscsi_mgmt_task *mtask;
546 uint32_t itt;
547
f6d5180c 548 conn->last_recv = jiffies;
b4377356
AV		 549 if (hdr->itt != RESERVED_ITT)
550 itt = get_itt(hdr->itt);
7996a778 551 else
b4377356 552 itt = ~0U;
7996a778
MC		 553
554 if (itt < session->cmds_max) {
555 ctask = session->cmds[itt];
556
557 debug_scsi("cmdrsp [op 0x%x cid %d itt 0x%x len %d]\n",
558 opcode, conn->id, ctask->itt, datalen);
559
560 switch(opcode) {
561 case ISCSI_OP_SCSI_CMD_RSP:
562 BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
77a23c21
MC		 563 iscsi_scsi_cmd_rsp(conn, hdr, ctask, data,
564 datalen);
7996a778
MC		 565 break;
566 case ISCSI_OP_SCSI_DATA_IN:
567 BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
568 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
569 conn->scsirsp_pdus_cnt++;
60ecebf5 570 __iscsi_put_ctask(ctask);
7996a778
MC		 571 }
572 break;
573 case ISCSI_OP_R2T:
574 /* LLD handles this for now */
575 break;
576 default:
577 rc = ISCSI_ERR_BAD_OPCODE;
578 break;
579 }
580 } else if (itt >= ISCSI_MGMT_ITT_OFFSET &&
581 itt < ISCSI_MGMT_ITT_OFFSET + session->mgmtpool_max) {
582 mtask = session->mgmt_cmds[itt - ISCSI_MGMT_ITT_OFFSET];
583
584 debug_scsi("immrsp [op 0x%x cid %d itt 0x%x len %d]\n",
585 opcode, conn->id, mtask->itt, datalen);
586
77a23c21 587 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
7996a778 588 switch(opcode) {
8d2860b3 589 case ISCSI_OP_LOGOUT_RSP:
c8dc1e52
MC		 590 if (datalen) {
591 rc = ISCSI_ERR_PROTO;
592 break;
593 }
8d2860b3
MC		 594 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
595 /* fall through */
7996a778
MC		 596 case ISCSI_OP_LOGIN_RSP:
597 case ISCSI_OP_TEXT_RSP:
8d2860b3
MC		 598 /*
599 * login related PDU's exp_statsn is handled in
600 * userspace
601 */
40527afe
MC		 602 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
603 rc = ISCSI_ERR_CONN_FAILED;
b3a7ea8d 604 iscsi_free_mgmt_task(conn, mtask);
7996a778
MC		 605 break;
606 case ISCSI_OP_SCSI_TMFUNC_RSP:
7996a778
MC		 607 if (datalen) {
608 rc = ISCSI_ERR_PROTO;
609 break;
610 }
8d2860b3 611
7ea8b828 612 iscsi_tmf_rsp(conn, hdr);
b3a7ea8d 613 iscsi_free_mgmt_task(conn, mtask);
7996a778
MC		 614 break;
615 case ISCSI_OP_NOOP_IN:
f6d5180c
MC		 616 if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) ||
617 datalen) {
7996a778
MC		 618 rc = ISCSI_ERR_PROTO;
619 break;
620 }
7996a778
MC		 621 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
622
f6d5180c
MC		 623 if (conn->ping_mtask != mtask) {
624 /*
625 * If this is not in response to one of our
626 * nops then it must be from userspace.
627 */
628 if (iscsi_recv_pdu(conn->cls_conn, hdr, data,
629 datalen))
630 rc = ISCSI_ERR_CONN_FAILED;
631 }
b3a7ea8d 632 iscsi_free_mgmt_task(conn, mtask);
7996a778
MC		 633 break;
634 default:
635 rc = ISCSI_ERR_BAD_OPCODE;
636 break;
637 }
b4377356 638 } else if (itt == ~0U) {
77a23c21 639 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
62f38300 640
7996a778
MC		 641 switch(opcode) {
642 case ISCSI_OP_NOOP_IN:
40527afe 643 if (datalen) {
7996a778 644 rc = ISCSI_ERR_PROTO;
40527afe
MC		 645 break;
646 }
647
b4377356 648 if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG))
40527afe
MC		 649 break;
650
f6d5180c 651 iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr);
7996a778
MC		 652 break;
653 case ISCSI_OP_REJECT:
62f38300
MC		 654 rc = iscsi_handle_reject(conn, hdr, data, datalen);
655 break;
7996a778 656 case ISCSI_OP_ASYNC_EVENT:
8d2860b3 657 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
5831c737
MC		 658 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
659 rc = ISCSI_ERR_CONN_FAILED;
7996a778
MC		 660 break;
661 default:
662 rc = ISCSI_ERR_BAD_OPCODE;
663 break;
664 }
665 } else
666 rc = ISCSI_ERR_BAD_ITT;
667
668 return rc;
669}
670EXPORT_SYMBOL_GPL(__iscsi_complete_pdu);
671
672int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
673 char *data, int datalen)
674{
675 int rc;
676
677 spin_lock(&conn->session->lock);
678 rc = __iscsi_complete_pdu(conn, hdr, data, datalen);
679 spin_unlock(&conn->session->lock);
680 return rc;
681}
682EXPORT_SYMBOL_GPL(iscsi_complete_pdu);
683
684/* verify itt (itt encoding: age+cid+itt) */
685int iscsi_verify_itt(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
686 uint32_t *ret_itt)
687{
688 struct iscsi_session *session = conn->session;
689 struct iscsi_cmd_task *ctask;
690 uint32_t itt;
691
b4377356
AV		 692 if (hdr->itt != RESERVED_ITT) {
693 if (((__force u32)hdr->itt & ISCSI_AGE_MASK) !=
7996a778 694 (session->age << ISCSI_AGE_SHIFT)) {
be2df72e 695 printk(KERN_ERR "iscsi: received itt %x expected "
b4377356 696 "session age (%x)\n", (__force u32)hdr->itt,
7996a778
MC		 697 session->age & ISCSI_AGE_MASK);
698 return ISCSI_ERR_BAD_ITT;
699 }
700
b4377356 701 if (((__force u32)hdr->itt & ISCSI_CID_MASK) !=
7996a778 702 (conn->id << ISCSI_CID_SHIFT)) {
be2df72e 703 printk(KERN_ERR "iscsi: received itt %x, expected "
b4377356 704 "CID (%x)\n", (__force u32)hdr->itt, conn->id);
7996a778
MC		 705 return ISCSI_ERR_BAD_ITT;
706 }
b4377356 707 itt = get_itt(hdr->itt);
7996a778 708 } else
b4377356 709 itt = ~0U;
7996a778
MC		 710
711 if (itt < session->cmds_max) {
712 ctask = session->cmds[itt];
713
714 if (!ctask->sc) {
be2df72e 715 printk(KERN_INFO "iscsi: dropping ctask with "
7996a778
MC		 716 "itt 0x%x\n", ctask->itt);
717 /* force drop */
718 return ISCSI_ERR_NO_SCSI_CMD;
719 }
720
721 if (ctask->sc->SCp.phase != session->age) {
be2df72e 722 printk(KERN_ERR "iscsi: ctask's session age %d, "
7996a778
MC		 723 "expected %d\n", ctask->sc->SCp.phase,
724 session->age);
725 return ISCSI_ERR_SESSION_FAILED;
726 }
727 }
728
729 *ret_itt = itt;
730 return 0;
731}
732EXPORT_SYMBOL_GPL(iscsi_verify_itt);
733
734void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
735{
736 struct iscsi_session *session = conn->session;
737 unsigned long flags;
738
739 spin_lock_irqsave(&session->lock, flags);
656cffc9
MC		 740 if (session->state == ISCSI_STATE_FAILED) {
741 spin_unlock_irqrestore(&session->lock, flags);
742 return;
743 }
744
67a61114 745 if (conn->stop_stage == 0)
7996a778
MC		 746 session->state = ISCSI_STATE_FAILED;
747 spin_unlock_irqrestore(&session->lock, flags);
748 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
749 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
750 iscsi_conn_error(conn->cls_conn, err);
751}
752EXPORT_SYMBOL_GPL(iscsi_conn_failure);
753
77a23c21
MC		 754static void iscsi_prep_mtask(struct iscsi_conn *conn,
755 struct iscsi_mgmt_task *mtask)
756{
757 struct iscsi_session *session = conn->session;
758 struct iscsi_hdr *hdr = mtask->hdr;
759 struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
760
761 if (hdr->opcode != (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) &&
762 hdr->opcode != (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
763 nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
764 /*
765 * pre-format CmdSN for outgoing PDU.
766 */
767 nop->cmdsn = cpu_to_be32(session->cmdsn);
768 if (hdr->itt != RESERVED_ITT) {
769 hdr->itt = build_itt(mtask->itt, conn->id, session->age);
e0726407
MC		 770 /*
771 * TODO: We always use immediate, so we never hit this.
772 * If we start to send tmfs or nops as non-immediate then
773 * we should start checking the cmdsn numbers for mgmt tasks.
774 */
77a23c21 775 if (conn->c_stage == ISCSI_CONN_STARTED &&
e0726407
MC		 776 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
777 session->queued_cmdsn++;
77a23c21 778 session->cmdsn++;
e0726407 779 }
77a23c21
MC		 780 }
781
782 if (session->tt->init_mgmt_task)
783 session->tt->init_mgmt_task(conn, mtask);
784
785 debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n",
843c0a8a
MC		 786 hdr->opcode & ISCSI_OPCODE_MASK, hdr->itt,
787 mtask->data_count);
77a23c21
MC		 788}
789
05db888a 790static int iscsi_xmit_mtask(struct iscsi_conn *conn)
b5072ea0
MC		 791{
792 struct iscsi_hdr *hdr = conn->mtask->hdr;
b3a7ea8d 793 int rc;
b5072ea0 794
b3a7ea8d
MC		 795 if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT)
796 conn->session->state = ISCSI_STATE_LOGGING_OUT;
77a23c21 797 spin_unlock_bh(&conn->session->lock);
b3a7ea8d 798
b5072ea0 799 rc = conn->session->tt->xmit_mgmt_task(conn, conn->mtask);
77a23c21 800 spin_lock_bh(&conn->session->lock);
b5072ea0
MC		 801 if (rc)
802 return rc;
803
05db888a
MC		 804 /* done with this in-progress mtask */
805 conn->mtask = NULL;
b5072ea0
MC		 806 return 0;
807}
808
77a23c21
MC		 809static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn)
810{
811 struct iscsi_session *session = conn->session;
812
813 /*
814 * Check for iSCSI window and take care of CmdSN wrap-around
815 */
e0726407
MC		 816 if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) {
817 debug_scsi("iSCSI CmdSN closed. ExpCmdSn %u MaxCmdSN %u "
818 "CmdSN %u/%u\n", session->exp_cmdsn,
819 session->max_cmdsn, session->cmdsn,
820 session->queued_cmdsn);
77a23c21
MC		 821 return -ENOSPC;
822 }
823 return 0;
824}
825
826static int iscsi_xmit_ctask(struct iscsi_conn *conn)
827{
828 struct iscsi_cmd_task *ctask = conn->ctask;
843c0a8a 829 int rc;
77a23c21
MC		 830
831 __iscsi_get_ctask(ctask);
832 spin_unlock_bh(&conn->session->lock);
833 rc = conn->session->tt->xmit_cmd_task(conn, ctask);
834 spin_lock_bh(&conn->session->lock);
835 __iscsi_put_ctask(ctask);
77a23c21
MC		 836 if (!rc)
837 /* done with this ctask */
838 conn->ctask = NULL;
839 return rc;
840}
841
843c0a8a
MC		 842/**
843 * iscsi_requeue_ctask - requeue ctask to run from session workqueue
844 * @ctask: ctask to requeue
845 *
846 * LLDs that need to run a ctask from the session workqueue should call
847 * this. The session lock must be held.
848 */
849void iscsi_requeue_ctask(struct iscsi_cmd_task *ctask)
850{
851 struct iscsi_conn *conn = ctask->conn;
852
853 list_move_tail(&ctask->running, &conn->requeue);
854 scsi_queue_work(conn->session->host, &conn->xmitwork);
855}
856EXPORT_SYMBOL_GPL(iscsi_requeue_ctask);
857
7996a778
MC		 858/**
859 * iscsi_data_xmit - xmit any command into the scheduled connection
860 * @conn: iscsi connection
861 *
862 * Notes:
863 * The function can return -EAGAIN in which case the caller must
864 * re-schedule it again later or recover. '0' return code means
865 * successful xmit.
866 **/
867static int iscsi_data_xmit(struct iscsi_conn *conn)
868{
3219e529 869 int rc = 0;
7996a778 870
77a23c21 871 spin_lock_bh(&conn->session->lock);
7996a778
MC		 872 if (unlikely(conn->suspend_tx)) {
873 debug_scsi("conn %d Tx suspended!\n", conn->id);
77a23c21 874 spin_unlock_bh(&conn->session->lock);
3219e529 875 return -ENODATA;
7996a778 876 }
7996a778
MC		 877
878 if (conn->ctask) {
77a23c21 879 rc = iscsi_xmit_ctask(conn);
3219e529 880 if (rc)
7996a778 881 goto again;
7996a778 882 }
77a23c21 883
7996a778 884 if (conn->mtask) {
05db888a 885 rc = iscsi_xmit_mtask(conn);
3219e529 886 if (rc)
7996a778 887 goto again;
7996a778
MC		 888 }
889
77a23c21
MC		 890 /*
891 * process mgmt pdus like nops before commands since we should
892 * only have one nop-out as a ping from us and targets should not
893 * overflow us with nop-ins
894 */
895check_mgmt:
843c0a8a
MC		 896 while (!list_empty(&conn->mgmtqueue)) {
897 conn->mtask = list_entry(conn->mgmtqueue.next,
898 struct iscsi_mgmt_task, running);
b3a7ea8d
MC		 899 if (conn->session->state == ISCSI_STATE_LOGGING_OUT) {
900 iscsi_free_mgmt_task(conn, conn->mtask);
901 conn->mtask = NULL;
902 continue;
903 }
904
77a23c21 905 iscsi_prep_mtask(conn, conn->mtask);
843c0a8a 906 list_move_tail(conn->mgmtqueue.next, &conn->mgmt_run_list);
77a23c21
MC		 907 rc = iscsi_xmit_mtask(conn);
908 if (rc)
909 goto again;
7996a778
MC		 910 }
911
843c0a8a 912 /* process pending command queue */
b6c395ed 913 while (!list_empty(&conn->xmitqueue)) {
843c0a8a
MC		 914 if (conn->tmf_state == TMF_QUEUED)
915 break;
916
b6c395ed
MC		 917 conn->ctask = list_entry(conn->xmitqueue.next,
918 struct iscsi_cmd_task, running);
b3a7ea8d 919 if (conn->session->state == ISCSI_STATE_LOGGING_OUT) {
9000bcd6 920 fail_command(conn, conn->ctask, DID_IMM_RETRY << 16);
b3a7ea8d
MC		 921 continue;
922 }
004d6530
BH		 923 if (iscsi_prep_scsi_cmd_pdu(conn->ctask)) {
924 fail_command(conn, conn->ctask, DID_ABORT << 16);
925 continue;
926 }
843c0a8a
MC		 927 conn->session->tt->init_cmd_task(conn->ctask);
928 conn->ctask->state = ISCSI_TASK_RUNNING;
b6c395ed 929 list_move_tail(conn->xmitqueue.next, &conn->run_list);
77a23c21
MC		 930 rc = iscsi_xmit_ctask(conn);
931 if (rc)
60ecebf5 932 goto again;
77a23c21
MC		 933 /*
934 * we could continuously get new ctask requests so
935 * we need to check the mgmt queue for nops that need to
936 * be sent to aviod starvation
937 */
843c0a8a
MC		 938 if (!list_empty(&conn->mgmtqueue))
939 goto check_mgmt;
940 }
941
942 while (!list_empty(&conn->requeue)) {
943 if (conn->session->fast_abort && conn->tmf_state != TMF_INITIAL)
944 break;
945
b3a7ea8d
MC		 946 /*
947 * we always do fastlogout - conn stop code will clean up.
948 */
949 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
950 break;
951
843c0a8a
MC		 952 conn->ctask = list_entry(conn->requeue.next,
953 struct iscsi_cmd_task, running);
954 conn->ctask->state = ISCSI_TASK_RUNNING;
955 list_move_tail(conn->requeue.next, &conn->run_list);
956 rc = iscsi_xmit_ctask(conn);
957 if (rc)
958 goto again;
959 if (!list_empty(&conn->mgmtqueue))
77a23c21 960 goto check_mgmt;
7996a778 961 }
b6c395ed 962 spin_unlock_bh(&conn->session->lock);
3219e529 963 return -ENODATA;
7996a778
MC		 964
965again:
966 if (unlikely(conn->suspend_tx))
77a23c21
MC		 967 rc = -ENODATA;
968 spin_unlock_bh(&conn->session->lock);
3219e529 969 return rc;
7996a778
MC		 970}
971
c4028958 972static void iscsi_xmitworker(struct work_struct *work)
7996a778 973{
c4028958
DH		 974 struct iscsi_conn *conn =
975 container_of(work, struct iscsi_conn, xmitwork);
3219e529 976 int rc;
7996a778
MC		 977 /*
978 * serialize Xmit worker on a per-connection basis.
979 */
3219e529
MC		 980 do {
981 rc = iscsi_data_xmit(conn);
982 } while (rc >= 0 || rc == -EAGAIN);
7996a778
MC		 983}
984
985enum {
986 FAILURE_BAD_HOST = 1,
987 FAILURE_SESSION_FAILED,
988 FAILURE_SESSION_FREED,
989 FAILURE_WINDOW_CLOSED,
60ecebf5 990 FAILURE_OOM,
7996a778 991 FAILURE_SESSION_TERMINATE,
656cffc9 992 FAILURE_SESSION_IN_RECOVERY,
7996a778 993 FAILURE_SESSION_RECOVERY_TIMEOUT,
b3a7ea8d 994 FAILURE_SESSION_LOGGING_OUT,
7996a778
MC		 995};
996
997int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
998{
999 struct Scsi_Host *host;
1000 int reason = 0;
1001 struct iscsi_session *session;
1002 struct iscsi_conn *conn;
1003 struct iscsi_cmd_task *ctask = NULL;
1004
1005 sc->scsi_done = done;
1006 sc->result = 0;
f47f2cf5 1007 sc->SCp.ptr = NULL;
7996a778
MC		 1008
1009 host = sc->device->host;
1010 session = iscsi_hostdata(host->hostdata);
1011
1012 spin_lock(&session->lock);
1013
656cffc9
MC		 1014 /*
1015 * ISCSI_STATE_FAILED is a temp. state. The recovery
1016 * code will decide what is best to do with command queued
1017 * during this time
1018 */
1019 if (session->state != ISCSI_STATE_LOGGED_IN &&
1020 session->state != ISCSI_STATE_FAILED) {
1021 /*
1022 * to handle the race between when we set the recovery state
1023 * and block the session we requeue here (commands could
1024 * be entering our queuecommand while a block is starting
1025 * up because the block code is not locked)
1026 */
9000bcd6
MC		 1027 switch (session->state) {
1028 case ISCSI_STATE_IN_RECOVERY:
656cffc9 1029 reason = FAILURE_SESSION_IN_RECOVERY;
67a61114 1030 goto reject;
9000bcd6
MC		 1031 case ISCSI_STATE_LOGGING_OUT:
1032 reason = FAILURE_SESSION_LOGGING_OUT;
1033 goto reject;
b3a7ea8d 1034 case ISCSI_STATE_RECOVERY_FAILED:
656cffc9 1035 reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
b3a7ea8d
MC		 1036 break;
1037 case ISCSI_STATE_TERMINATE:
656cffc9 1038 reason = FAILURE_SESSION_TERMINATE;
b3a7ea8d 1039 break;
b3a7ea8d 1040 default:
656cffc9 1041 reason = FAILURE_SESSION_FREED;
b3a7ea8d 1042 }
7996a778
MC		 1043 goto fault;
1044 }
1045
7996a778 1046 conn = session->leadconn;
98644047
MC		 1047 if (!conn) {
1048 reason = FAILURE_SESSION_FREED;
1049 goto fault;
1050 }
7996a778 1051
77a23c21
MC		 1052 if (iscsi_check_cmdsn_window_closed(conn)) {
1053 reason = FAILURE_WINDOW_CLOSED;
1054 goto reject;
1055 }
1056
60ecebf5
MC		 1057 if (!__kfifo_get(session->cmdpool.queue, (void*)&ctask,
1058 sizeof(void*))) {
1059 reason = FAILURE_OOM;
1060 goto reject;
1061 }
e0726407
MC		 1062 session->queued_cmdsn++;
1063
7996a778
MC		 1064 sc->SCp.phase = session->age;
1065 sc->SCp.ptr = (char *)ctask;
1066
60ecebf5 1067 atomic_set(&ctask->refcount, 1);
b6c395ed 1068 ctask->state = ISCSI_TASK_PENDING;
7996a778
MC		 1069 ctask->conn = conn;
1070 ctask->sc = sc;
1071 INIT_LIST_HEAD(&ctask->running);
7996a778 1072
b6c395ed 1073 list_add_tail(&ctask->running, &conn->xmitqueue);
7996a778
MC		 1074 spin_unlock(&session->lock);
1075
1076 scsi_queue_work(host, &conn->xmitwork);
1077 return 0;
1078
1079reject:
1080 spin_unlock(&session->lock);
1081 debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason);
1082 return SCSI_MLQUEUE_HOST_BUSY;
1083
1084fault:
1085 spin_unlock(&session->lock);
be2df72e 1086 printk(KERN_ERR "iscsi: cmd 0x%x is not queued (%d)\n",
7996a778
MC		 1087 sc->cmnd[0], reason);
1088 sc->result = (DID_NO_CONNECT << 16);
1c138991 1089 scsi_set_resid(sc, scsi_bufflen(sc));
7996a778
MC		 1090 sc->scsi_done(sc);
1091 return 0;
1092}
1093EXPORT_SYMBOL_GPL(iscsi_queuecommand);
1094
1095int iscsi_change_queue_depth(struct scsi_device *sdev, int depth)
1096{
1097 if (depth > ISCSI_MAX_CMD_PER_LUN)
1098 depth = ISCSI_MAX_CMD_PER_LUN;
1099 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
1100 return sdev->queue_depth;
1101}
1102EXPORT_SYMBOL_GPL(iscsi_change_queue_depth);
1103
7996a778
MC		 1104void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
1105{
1106 struct iscsi_session *session = class_to_transport_session(cls_session);
7996a778
MC		 1107
1108 spin_lock_bh(&session->lock);
1109 if (session->state != ISCSI_STATE_LOGGED_IN) {
656cffc9 1110 session->state = ISCSI_STATE_RECOVERY_FAILED;
843c0a8a
MC		 1111 if (session->leadconn)
1112 wake_up(&session->leadconn->ehwait);
7996a778
MC		 1113 }
1114 spin_unlock_bh(&session->lock);
1115}
1116EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
1117
1118int iscsi_eh_host_reset(struct scsi_cmnd *sc)
1119{
1120 struct Scsi_Host *host = sc->device->host;
1121 struct iscsi_session *session = iscsi_hostdata(host->hostdata);
1122 struct iscsi_conn *conn = session->leadconn;
7996a778 1123
bc436b27 1124 mutex_lock(&session->eh_mutex);
7996a778
MC		 1125 spin_lock_bh(&session->lock);
1126 if (session->state == ISCSI_STATE_TERMINATE) {
1127failed:
1128 debug_scsi("failing host reset: session terminated "
d6e24d1c 1129 "[CID %d age %d]\n", conn->id, session->age);
7996a778 1130 spin_unlock_bh(&session->lock);
bc436b27 1131 mutex_unlock(&session->eh_mutex);
7996a778
MC		 1132 return FAILED;
1133 }
1134
7996a778 1135 spin_unlock_bh(&session->lock);
bc436b27 1136 mutex_unlock(&session->eh_mutex);
7996a778
MC		 1137 /*
1138 * we drop the lock here but the leadconn cannot be destoyed while
1139 * we are in the scsi eh
1140 */
843c0a8a 1141 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
7996a778
MC		 1142
1143 debug_scsi("iscsi_eh_host_reset wait for relogin\n");
1144 wait_event_interruptible(conn->ehwait,
1145 session->state == ISCSI_STATE_TERMINATE ||
1146 session->state == ISCSI_STATE_LOGGED_IN ||
656cffc9 1147 session->state == ISCSI_STATE_RECOVERY_FAILED);
7996a778
MC		 1148 if (signal_pending(current))
1149 flush_signals(current);
1150
bc436b27 1151 mutex_lock(&session->eh_mutex);
7996a778
MC		 1152 spin_lock_bh(&session->lock);
1153 if (session->state == ISCSI_STATE_LOGGED_IN)
be2df72e 1154 printk(KERN_INFO "iscsi: host reset succeeded\n");
7996a778
MC		 1155 else
1156 goto failed;
1157 spin_unlock_bh(&session->lock);
bc436b27 1158 mutex_unlock(&session->eh_mutex);
7996a778
MC		 1159 return SUCCESS;
1160}
1161EXPORT_SYMBOL_GPL(iscsi_eh_host_reset);
1162
843c0a8a 1163static void iscsi_tmf_timedout(unsigned long data)
7996a778 1164{
843c0a8a 1165 struct iscsi_conn *conn = (struct iscsi_conn *)data;
7996a778
MC		 1166 struct iscsi_session *session = conn->session;
1167
1168 spin_lock(&session->lock);
843c0a8a
MC		 1169 if (conn->tmf_state == TMF_QUEUED) {
1170 conn->tmf_state = TMF_TIMEDOUT;
1171 debug_scsi("tmf timedout\n");
7996a778
MC		 1172 /* unblock eh_abort() */
1173 wake_up(&conn->ehwait);
1174 }
1175 spin_unlock(&session->lock);
1176}
1177
843c0a8a 1178static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn,
f6d5180c
MC		 1179 struct iscsi_tm *hdr, int age,
1180 int timeout)
7996a778 1181{
7996a778 1182 struct iscsi_session *session = conn->session;
843c0a8a 1183 struct iscsi_mgmt_task *mtask;
7996a778 1184
843c0a8a
MC		 1185 mtask = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr,
1186 NULL, 0);
1187 if (!mtask) {
6724add1 1188 spin_unlock_bh(&session->lock);
7996a778 1189 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
843c0a8a
MC		 1190 spin_lock_bh(&session->lock);
1191 debug_scsi("tmf exec failure\n");
77a23c21 1192 return -EPERM;
7996a778 1193 }
843c0a8a 1194 conn->tmfcmd_pdus_cnt++;
f6d5180c 1195 conn->tmf_timer.expires = timeout * HZ + jiffies;
843c0a8a
MC		 1196 conn->tmf_timer.function = iscsi_tmf_timedout;
1197 conn->tmf_timer.data = (unsigned long)conn;
1198 add_timer(&conn->tmf_timer);
1199 debug_scsi("tmf set timeout\n");
7996a778 1200
7996a778 1201 spin_unlock_bh(&session->lock);
6724add1 1202 mutex_unlock(&session->eh_mutex);
77a23c21 1203 scsi_queue_work(session->host, &conn->xmitwork);
7996a778
MC		 1204
1205 /*
1206 * block eh thread until:
1207 *
843c0a8a
MC		 1208 * 1) tmf response
1209 * 2) tmf timeout
7996a778
MC		 1210 * 3) session is terminated or restarted or userspace has
1211 * given up on recovery
1212 */
843c0a8a 1213 wait_event_interruptible(conn->ehwait, age != session->age ||
7996a778 1214 session->state != ISCSI_STATE_LOGGED_IN ||
843c0a8a 1215 conn->tmf_state != TMF_QUEUED);
7996a778
MC		 1216 if (signal_pending(current))
1217 flush_signals(current);
843c0a8a
MC		 1218 del_timer_sync(&conn->tmf_timer);
1219
6724add1 1220 mutex_lock(&session->eh_mutex);
77a23c21 1221 spin_lock_bh(&session->lock);
843c0a8a
MC		 1222 /* if the session drops it will clean up the mtask */
1223 if (age != session->age ||
1224 session->state != ISCSI_STATE_LOGGED_IN)
1225 return -ENOTCONN;
7996a778
MC		 1226 return 0;
1227}
1228
843c0a8a
MC		 1229/*
1230 * Fail commands. session lock held and recv side suspended and xmit
1231 * thread flushed
1232 */
1233static void fail_all_commands(struct iscsi_conn *conn, unsigned lun)
1234{
1235 struct iscsi_cmd_task *ctask, *tmp;
1236
1237 if (conn->ctask && (conn->ctask->sc->device->lun == lun || lun == -1))
1238 conn->ctask = NULL;
1239
1240 /* flush pending */
1241 list_for_each_entry_safe(ctask, tmp, &conn->xmitqueue, running) {
1242 if (lun == ctask->sc->device->lun || lun == -1) {
1243 debug_scsi("failing pending sc %p itt 0x%x\n",
1244 ctask->sc, ctask->itt);
1245 fail_command(conn, ctask, DID_BUS_BUSY << 16);
1246 }
1247 }
1248
1249 list_for_each_entry_safe(ctask, tmp, &conn->requeue, running) {
1250 if (lun == ctask->sc->device->lun || lun == -1) {
1251 debug_scsi("failing requeued sc %p itt 0x%x\n",
1252 ctask->sc, ctask->itt);
1253 fail_command(conn, ctask, DID_BUS_BUSY << 16);
1254 }
1255 }
1256
1257 /* fail all other running */
1258 list_for_each_entry_safe(ctask, tmp, &conn->run_list, running) {
1259 if (lun == ctask->sc->device->lun || lun == -1) {
1260 debug_scsi("failing in progress sc %p itt 0x%x\n",
1261 ctask->sc, ctask->itt);
1262 fail_command(conn, ctask, DID_BUS_BUSY << 16);
1263 }
1264 }
1265}
1266
6724add1
MC		 1267static void iscsi_suspend_tx(struct iscsi_conn *conn)
1268{
1269 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1270 scsi_flush_work(conn->session->host);
1271}
1272
1273static void iscsi_start_tx(struct iscsi_conn *conn)
1274{
1275 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1276 scsi_queue_work(conn->session->host, &conn->xmitwork);
1277}
1278
f6d5180c
MC		 1279static enum scsi_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *scmd)
1280{
1281 struct iscsi_cls_session *cls_session;
1282 struct iscsi_session *session;
1283 struct iscsi_conn *conn;
1284 enum scsi_eh_timer_return rc = EH_NOT_HANDLED;
1285
1286 cls_session = starget_to_session(scsi_target(scmd->device));
1287 session = class_to_transport_session(cls_session);
1288
1289 debug_scsi("scsi cmd %p timedout\n", scmd);
1290
1291 spin_lock(&session->lock);
1292 if (session->state != ISCSI_STATE_LOGGED_IN) {
1293 /*
1294 * We are probably in the middle of iscsi recovery so let
1295 * that complete and handle the error.
1296 */
1297 rc = EH_RESET_TIMER;
1298 goto done;
1299 }
1300
1301 conn = session->leadconn;
1302 if (!conn) {
1303 /* In the middle of shuting down */
1304 rc = EH_RESET_TIMER;
1305 goto done;
1306 }
1307
1308 if (!conn->recv_timeout && !conn->ping_timeout)
1309 goto done;
1310 /*
1311 * if the ping timedout then we are in the middle of cleaning up
1312 * and can let the iscsi eh handle it
1313 */
1314 if (time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) +
1315 (conn->ping_timeout * HZ), jiffies))
1316 rc = EH_RESET_TIMER;
1317 /*
1318 * if we are about to check the transport then give the command
1319 * more time
1320 */
1321 if (time_before_eq(conn->last_recv + (conn->recv_timeout * HZ),
1322 jiffies))
1323 rc = EH_RESET_TIMER;
1324 /* if in the middle of checking the transport then give us more time */
1325 if (conn->ping_mtask)
1326 rc = EH_RESET_TIMER;
1327done:
1328 spin_unlock(&session->lock);
1329 debug_scsi("return %s\n", rc == EH_RESET_TIMER ? "timer reset" : "nh");
1330 return rc;
1331}
1332
1333static void iscsi_check_transport_timeouts(unsigned long data)
1334{
1335 struct iscsi_conn *conn = (struct iscsi_conn *)data;
1336 struct iscsi_session *session = conn->session;
1337 unsigned long timeout, next_timeout = 0, last_recv;
1338
1339 spin_lock(&session->lock);
1340 if (session->state != ISCSI_STATE_LOGGED_IN)
1341 goto done;
1342
1343 timeout = conn->recv_timeout;
1344 if (!timeout)
1345 goto done;
1346
1347 timeout *= HZ;
1348 last_recv = conn->last_recv;
1349 if (time_before_eq(last_recv + timeout + (conn->ping_timeout * HZ),
1350 jiffies)) {
1351 printk(KERN_ERR "ping timeout of %d secs expired, "
1352 "last rx %lu, last ping %lu, now %lu\n",
1353 conn->ping_timeout, last_recv,
1354 conn->last_ping, jiffies);
1355 spin_unlock(&session->lock);
1356 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1357 return;
1358 }
1359
1360 if (time_before_eq(last_recv + timeout, jiffies)) {
1361 if (time_before_eq(conn->last_ping, last_recv)) {
1362 /* send a ping to try to provoke some traffic */
1363 debug_scsi("Sending nopout as ping on conn %p\n", conn);
1364 iscsi_send_nopout(conn, NULL);
1365 }
1366 next_timeout = last_recv + timeout + (conn->ping_timeout * HZ);
1367 } else {
1368 next_timeout = last_recv + timeout;
1369 }
1370
1371 if (next_timeout) {
1372 debug_scsi("Setting next tmo %lu\n", next_timeout);
1373 mod_timer(&conn->transport_timer, next_timeout);
1374 }
1375done:
1376 spin_unlock(&session->lock);
1377}
1378
843c0a8a
MC		 1379static void iscsi_prep_abort_task_pdu(struct iscsi_cmd_task *ctask,
1380 struct iscsi_tm *hdr)
1381{
1382 memset(hdr, 0, sizeof(*hdr));
1383 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
1384 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK;
1385 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
1386 memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
1387 hdr->rtt = ctask->hdr->itt;
1388 hdr->refcmdsn = ctask->hdr->cmdsn;
1389}
1390
7996a778
MC		 1391int iscsi_eh_abort(struct scsi_cmnd *sc)
1392{
6724add1
MC		 1393 struct Scsi_Host *host = sc->device->host;
1394 struct iscsi_session *session = iscsi_hostdata(host->hostdata);
f47f2cf5 1395 struct iscsi_conn *conn;
843c0a8a
MC		 1396 struct iscsi_cmd_task *ctask;
1397 struct iscsi_tm *hdr;
1398 int rc, age;
7996a778 1399
6724add1
MC		 1400 mutex_lock(&session->eh_mutex);
1401 spin_lock_bh(&session->lock);
f47f2cf5
MC		 1402 /*
1403 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
1404 * got the command.
1405 */
1406 if (!sc->SCp.ptr) {
1407 debug_scsi("sc never reached iscsi layer or it completed.\n");
6724add1
MC		 1408 spin_unlock_bh(&session->lock);
1409 mutex_unlock(&session->eh_mutex);
f47f2cf5
MC		 1410 return SUCCESS;
1411 }
1412
7996a778
MC		 1413 /*
1414 * If we are not logged in or we have started a new session
1415 * then let the host reset code handle this
1416 */
843c0a8a
MC		 1417 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN ||
1418 sc->SCp.phase != session->age) {
1419 spin_unlock_bh(&session->lock);
1420 mutex_unlock(&session->eh_mutex);
1421 return FAILED;
1422 }
1423
1424 conn = session->leadconn;
1425 conn->eh_abort_cnt++;
1426 age = session->age;
1427
1428 ctask = (struct iscsi_cmd_task *)sc->SCp.ptr;
1429 debug_scsi("aborting [sc %p itt 0x%x]\n", sc, ctask->itt);
7996a778
MC		 1430
1431 /* ctask completed before time out */
7ea8b828 1432 if (!ctask->sc) {
7ea8b828 1433 debug_scsi("sc completed while abort in progress\n");
77a23c21 1434 goto success;
7ea8b828 1435 }
7996a778 1436
77a23c21
MC		 1437 if (ctask->state == ISCSI_TASK_PENDING) {
1438 fail_command(conn, ctask, DID_ABORT << 16);
1439 goto success;
1440 }
7996a778 1441
843c0a8a
MC		 1442 /* only have one tmf outstanding at a time */
1443 if (conn->tmf_state != TMF_INITIAL)
7996a778 1444 goto failed;
843c0a8a 1445 conn->tmf_state = TMF_QUEUED;
7996a778 1446
843c0a8a
MC		 1447 hdr = &conn->tmhdr;
1448 iscsi_prep_abort_task_pdu(ctask, hdr);
1449
f6d5180c 1450 if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout)) {
843c0a8a
MC		 1451 rc = FAILED;
1452 goto failed;
1453 }
1454
1455 switch (conn->tmf_state) {
1456 case TMF_SUCCESS:
77a23c21 1457 spin_unlock_bh(&session->lock);
6724add1 1458 iscsi_suspend_tx(conn);
77a23c21
MC		 1459 /*
1460 * clean up task if aborted. grab the recv lock as a writer
1461 */
1462 write_lock_bh(conn->recv_lock);
1463 spin_lock(&session->lock);
1464 fail_command(conn, ctask, DID_ABORT << 16);
843c0a8a 1465 conn->tmf_state = TMF_INITIAL;
77a23c21
MC		 1466 spin_unlock(&session->lock);
1467 write_unlock_bh(conn->recv_lock);
6724add1 1468 iscsi_start_tx(conn);
77a23c21 1469 goto success_unlocked;
843c0a8a
MC		 1470 case TMF_TIMEDOUT:
1471 spin_unlock_bh(&session->lock);
1472 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1473 goto failed_unlocked;
1474 case TMF_NOT_FOUND:
1475 if (!sc->SCp.ptr) {
1476 conn->tmf_state = TMF_INITIAL;
7ea8b828 1477 /* ctask completed before tmf abort response */
7ea8b828 1478 debug_scsi("sc completed while abort in progress\n");
77a23c21 1479 goto success;
7ea8b828
MC		 1480 }
1481 /* fall through */
1482 default:
843c0a8a
MC		 1483 conn->tmf_state = TMF_INITIAL;
1484 goto failed;
7996a778
MC		 1485 }
1486
77a23c21 1487success:
7996a778 1488 spin_unlock_bh(&session->lock);
77a23c21
MC		 1489success_unlocked:
1490 debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
6724add1 1491 mutex_unlock(&session->eh_mutex);
7996a778
MC		 1492 return SUCCESS;
1493
1494failed:
1495 spin_unlock_bh(&session->lock);
77a23c21 1496failed_unlocked:
843c0a8a
MC		 1497 debug_scsi("abort failed [sc %p itt 0x%x]\n", sc,
1498 ctask ? ctask->itt : 0);
6724add1 1499 mutex_unlock(&session->eh_mutex);
7996a778
MC		 1500 return FAILED;
1501}
1502EXPORT_SYMBOL_GPL(iscsi_eh_abort);
1503
843c0a8a
MC		 1504static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
1505{
1506 memset(hdr, 0, sizeof(*hdr));
1507 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
1508 hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK;
1509 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
1510 int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun);
f6d5180c 1511 hdr->rtt = RESERVED_ITT;
843c0a8a
MC		 1512}
1513
1514int iscsi_eh_device_reset(struct scsi_cmnd *sc)
1515{
1516 struct Scsi_Host *host = sc->device->host;
1517 struct iscsi_session *session = iscsi_hostdata(host->hostdata);
1518 struct iscsi_conn *conn;
1519 struct iscsi_tm *hdr;
1520 int rc = FAILED;
1521
1522 debug_scsi("LU Reset [sc %p lun %u]\n", sc, sc->device->lun);
1523
1524 mutex_lock(&session->eh_mutex);
1525 spin_lock_bh(&session->lock);
1526 /*
1527 * Just check if we are not logged in. We cannot check for
1528 * the phase because the reset could come from a ioctl.
1529 */
1530 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
1531 goto unlock;
1532 conn = session->leadconn;
1533
1534 /* only have one tmf outstanding at a time */
1535 if (conn->tmf_state != TMF_INITIAL)
1536 goto unlock;
1537 conn->tmf_state = TMF_QUEUED;
1538
1539 hdr = &conn->tmhdr;
1540 iscsi_prep_lun_reset_pdu(sc, hdr);
1541
f6d5180c
MC		 1542 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
1543 session->lu_reset_timeout)) {
843c0a8a
MC		 1544 rc = FAILED;
1545 goto unlock;
1546 }
1547
1548 switch (conn->tmf_state) {
1549 case TMF_SUCCESS:
1550 break;
1551 case TMF_TIMEDOUT:
1552 spin_unlock_bh(&session->lock);
1553 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1554 goto done;
1555 default:
1556 conn->tmf_state = TMF_INITIAL;
1557 goto unlock;
1558 }
1559
1560 rc = SUCCESS;
1561 spin_unlock_bh(&session->lock);
1562
1563 iscsi_suspend_tx(conn);
1564 /* need to grab the recv lock then session lock */
1565 write_lock_bh(conn->recv_lock);
1566 spin_lock(&session->lock);
1567 fail_all_commands(conn, sc->device->lun);
1568 conn->tmf_state = TMF_INITIAL;
1569 spin_unlock(&session->lock);
1570 write_unlock_bh(conn->recv_lock);
1571
1572 iscsi_start_tx(conn);
1573 goto done;
1574
1575unlock:
1576 spin_unlock_bh(&session->lock);
1577done:
1578 debug_scsi("iscsi_eh_device_reset %s\n",
1579 rc == SUCCESS ? "SUCCESS" : "FAILED");
1580 mutex_unlock(&session->eh_mutex);
1581 return rc;
1582}
1583EXPORT_SYMBOL_GPL(iscsi_eh_device_reset);
1584
6320377f
OK		 1585/*
1586 * Pre-allocate a pool of @max items of @item_size. By default, the pool
1587 * should be accessed via kfifo_{get,put} on q->queue.
1588 * Optionally, the caller can obtain the array of object pointers
1589 * by passing in a non-NULL @items pointer
1590 */
7996a778 1591int
6320377f 1592iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size)
7996a778 1593{
6320377f 1594 int i, num_arrays = 1;
7996a778 1595
6320377f 1596 memset(q, 0, sizeof(*q));
7996a778
MC		 1597
1598 q->max = max;
6320377f
OK		 1599
1600 /* If the user passed an items pointer, he wants a copy of
1601 * the array. */
1602 if (items)
1603 num_arrays++;
1604 q->pool = kzalloc(num_arrays * max * sizeof(void*), GFP_KERNEL);
1605 if (q->pool == NULL)
1606 goto enomem;
7996a778
MC		 1607
1608 q->queue = kfifo_init((void*)q->pool, max * sizeof(void*),
1609 GFP_KERNEL, NULL);
6320377f
OK		 1610 if (q->queue == ERR_PTR(-ENOMEM))
1611 goto enomem;
7996a778
MC		 1612
1613 for (i = 0; i < max; i++) {
6320377f 1614 q->pool[i] = kzalloc(item_size, GFP_KERNEL);
7996a778 1615 if (q->pool[i] == NULL) {
6320377f
OK		 1616 q->max = i;
1617 goto enomem;
7996a778 1618 }
7996a778
MC		 1619 __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*));
1620 }
6320377f
OK		 1621
1622 if (items) {
1623 *items = q->pool + max;
1624 memcpy(*items, q->pool, max * sizeof(void *));
1625 }
1626
7996a778 1627 return 0;
6320377f
OK		 1628
1629enomem:
1630 iscsi_pool_free(q);
1631 return -ENOMEM;
7996a778
MC		 1632}
1633EXPORT_SYMBOL_GPL(iscsi_pool_init);
1634
6320377f 1635void iscsi_pool_free(struct iscsi_pool *q)
7996a778
MC		 1636{
1637 int i;
1638
1639 for (i = 0; i < q->max; i++)
6320377f
OK		 1640 kfree(q->pool[i]);
1641 if (q->pool)
1642 kfree(q->pool);
7996a778
MC		 1643}
1644EXPORT_SYMBOL_GPL(iscsi_pool_free);
1645
1646/*
1647 * iSCSI Session's hostdata organization:
1648 *
1649 * *------------------* <== hostdata_session(host->hostdata)
1650 * | ptr to class sess|
1651 * |------------------| <== iscsi_hostdata(host->hostdata)
1652 * | iscsi_session |
1653 * *------------------*
1654 */
1655
1656#define hostdata_privsize(_sz) (sizeof(unsigned long) + _sz + \
1657 _sz % sizeof(unsigned long))
1658
1659#define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata))
1660
1661/**
1662 * iscsi_session_setup - create iscsi cls session and host and session
1663 * @scsit: scsi transport template
1664 * @iscsit: iscsi transport template
1548271e
MC		 1665 * @cmds_max: scsi host can queue
1666 * @qdepth: scsi host cmds per lun
1667 * @cmd_task_size: LLD ctask private data size
1668 * @mgmt_task_size: LLD mtask private data size
7996a778
MC		 1669 * @initial_cmdsn: initial CmdSN
1670 * @hostno: host no allocated
1671 *
1672 * This can be used by software iscsi_transports that allocate
1673 * a session per scsi host.
1674 **/
1675struct iscsi_cls_session *
1676iscsi_session_setup(struct iscsi_transport *iscsit,
1677 struct scsi_transport_template *scsit,
1548271e 1678 uint16_t cmds_max, uint16_t qdepth,
7996a778
MC		 1679 int cmd_task_size, int mgmt_task_size,
1680 uint32_t initial_cmdsn, uint32_t *hostno)
1681{
1682 struct Scsi_Host *shost;
1683 struct iscsi_session *session;
1684 struct iscsi_cls_session *cls_session;
1685 int cmd_i;
1686
1548271e
MC		 1687 if (qdepth > ISCSI_MAX_CMD_PER_LUN || qdepth < 1) {
1688 if (qdepth != 0)
1689 printk(KERN_ERR "iscsi: invalid queue depth of %d. "
1690 "Queue depth must be between 1 and %d.\n",
1691 qdepth, ISCSI_MAX_CMD_PER_LUN);
1692 qdepth = ISCSI_DEF_CMD_PER_LUN;
1693 }
1694
1695 if (cmds_max < 2 || (cmds_max & (cmds_max - 1)) ||
1696 cmds_max >= ISCSI_MGMT_ITT_OFFSET) {
1697 if (cmds_max != 0)
1698 printk(KERN_ERR "iscsi: invalid can_queue of %d. "
1699 "can_queue must be a power of 2 and between "
1700 "2 and %d - setting to %d.\n", cmds_max,
1701 ISCSI_MGMT_ITT_OFFSET, ISCSI_DEF_XMIT_CMDS_MAX);
1702 cmds_max = ISCSI_DEF_XMIT_CMDS_MAX;
1703 }
1704
7996a778
MC		 1705 shost = scsi_host_alloc(iscsit->host_template,
1706 hostdata_privsize(sizeof(*session)));
1707 if (!shost)
1708 return NULL;
1709
1548271e
MC		 1710 /* the iscsi layer takes one task for reserve */
1711 shost->can_queue = cmds_max - 1;
1712 shost->cmd_per_lun = qdepth;
7996a778
MC		 1713 shost->max_id = 1;
1714 shost->max_channel = 0;
1715 shost->max_lun = iscsit->max_lun;
1716 shost->max_cmd_len = iscsit->max_cmd_len;
1717 shost->transportt = scsit;
1718 shost->transportt->create_work_queue = 1;
f6d5180c 1719 shost->transportt->eh_timed_out = iscsi_eh_cmd_timed_out;
7996a778
MC		 1720 *hostno = shost->host_no;
1721
1722 session = iscsi_hostdata(shost->hostdata);
1723 memset(session, 0, sizeof(struct iscsi_session));
1724 session->host = shost;
1725 session->state = ISCSI_STATE_FREE;
f6d5180c 1726 session->fast_abort = 1;
7996a778 1727 session->mgmtpool_max = ISCSI_MGMT_CMDS_MAX;
1548271e 1728 session->cmds_max = cmds_max;
e0726407 1729 session->queued_cmdsn = session->cmdsn = initial_cmdsn;
7996a778
MC		 1730 session->exp_cmdsn = initial_cmdsn + 1;
1731 session->max_cmdsn = initial_cmdsn + 1;
1732 session->max_r2t = 1;
1733 session->tt = iscsit;
6724add1 1734 mutex_init(&session->eh_mutex);
7996a778
MC		 1735
1736 /* initialize SCSI PDU commands pool */
1737 if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
1738 (void***)&session->cmds,
1739 cmd_task_size + sizeof(struct iscsi_cmd_task)))
1740 goto cmdpool_alloc_fail;
1741
1742 /* pre-format cmds pool with ITT */
1743 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
1744 struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
1745
1746 if (cmd_task_size)
1747 ctask->dd_data = &ctask[1];
1748 ctask->itt = cmd_i;
b6c395ed 1749 INIT_LIST_HEAD(&ctask->running);
7996a778
MC		 1750 }
1751
1752 spin_lock_init(&session->lock);
7996a778
MC		 1753
1754 /* initialize immediate command pool */
1755 if (iscsi_pool_init(&session->mgmtpool, session->mgmtpool_max,
1756 (void***)&session->mgmt_cmds,
1757 mgmt_task_size + sizeof(struct iscsi_mgmt_task)))
1758 goto mgmtpool_alloc_fail;
1759
1760
1761 /* pre-format immediate cmds pool with ITT */
1762 for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) {
1763 struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i];
1764
1765 if (mgmt_task_size)
1766 mtask->dd_data = &mtask[1];
1767 mtask->itt = ISCSI_MGMT_ITT_OFFSET + cmd_i;
b6c395ed 1768 INIT_LIST_HEAD(&mtask->running);
7996a778
MC		 1769 }
1770
1771 if (scsi_add_host(shost, NULL))
1772 goto add_host_fail;
1773
f53a88da
MC		 1774 if (!try_module_get(iscsit->owner))
1775 goto cls_session_fail;
1776
6a8a0d36 1777 cls_session = iscsi_create_session(shost, iscsit, 0);
7996a778 1778 if (!cls_session)
f53a88da 1779 goto module_put;
7996a778
MC		 1780 *(unsigned long*)shost->hostdata = (unsigned long)cls_session;
1781
1782 return cls_session;
1783
f53a88da
MC		 1784module_put:
1785 module_put(iscsit->owner);
7996a778
MC		 1786cls_session_fail:
1787 scsi_remove_host(shost);
1788add_host_fail:
6320377f 1789 iscsi_pool_free(&session->mgmtpool);
7996a778 1790mgmtpool_alloc_fail:
6320377f 1791 iscsi_pool_free(&session->cmdpool);
7996a778
MC		 1792cmdpool_alloc_fail:
1793 scsi_host_put(shost);
1794 return NULL;
1795}
1796EXPORT_SYMBOL_GPL(iscsi_session_setup);
1797
1798/**
1799 * iscsi_session_teardown - destroy session, host, and cls_session
1800 * shost: scsi host
1801 *
1802 * This can be used by software iscsi_transports that allocate
1803 * a session per scsi host.
1804 **/
1805void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
1806{
1807 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
1808 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
63f75cc8 1809 struct module *owner = cls_session->transport->owner;
7996a778 1810
26974789 1811 iscsi_remove_session(cls_session);
7996a778
MC		 1812 scsi_remove_host(shost);
1813
6320377f
OK		 1814 iscsi_pool_free(&session->mgmtpool);
1815 iscsi_pool_free(&session->cmdpool);
7996a778 1816
b2c64167
MC		 1817 kfree(session->password);
1818 kfree(session->password_in);
1819 kfree(session->username);
1820 kfree(session->username_in);
f3ff0c36 1821 kfree(session->targetname);
d8196ed2 1822 kfree(session->netdev);
0801c242 1823 kfree(session->hwaddress);
8ad5781a 1824 kfree(session->initiatorname);
f3ff0c36 1825
26974789 1826 iscsi_free_session(cls_session);
7996a778 1827 scsi_host_put(shost);
63f75cc8 1828 module_put(owner);
7996a778
MC		 1829}
1830EXPORT_SYMBOL_GPL(iscsi_session_teardown);
1831
1832/**
1833 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
1834 * @cls_session: iscsi_cls_session
1835 * @conn_idx: cid
1836 **/
1837struct iscsi_cls_conn *
1838iscsi_conn_setup(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
1839{
1840 struct iscsi_session *session = class_to_transport_session(cls_session);
1841 struct iscsi_conn *conn;
1842 struct iscsi_cls_conn *cls_conn;
d36ab6f3 1843 char *data;
7996a778
MC		 1844
1845 cls_conn = iscsi_create_conn(cls_session, conn_idx);
1846 if (!cls_conn)
1847 return NULL;
1848 conn = cls_conn->dd_data;
1849 memset(conn, 0, sizeof(*conn));
1850
1851 conn->session = session;
1852 conn->cls_conn = cls_conn;
1853 conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
1854 conn->id = conn_idx;
1855 conn->exp_statsn = 0;
843c0a8a 1856 conn->tmf_state = TMF_INITIAL;
f6d5180c
MC		 1857
1858 init_timer(&conn->transport_timer);
1859 conn->transport_timer.data = (unsigned long)conn;
1860 conn->transport_timer.function = iscsi_check_transport_timeouts;
1861
7996a778
MC		 1862 INIT_LIST_HEAD(&conn->run_list);
1863 INIT_LIST_HEAD(&conn->mgmt_run_list);
843c0a8a 1864 INIT_LIST_HEAD(&conn->mgmtqueue);
b6c395ed 1865 INIT_LIST_HEAD(&conn->xmitqueue);
843c0a8a 1866 INIT_LIST_HEAD(&conn->requeue);
c4028958 1867 INIT_WORK(&conn->xmitwork, iscsi_xmitworker);
7996a778
MC		 1868
1869 /* allocate login_mtask used for the login/text sequences */
1870 spin_lock_bh(&session->lock);
1871 if (!__kfifo_get(session->mgmtpool.queue,
1872 (void*)&conn->login_mtask,
1873 sizeof(void*))) {
1874 spin_unlock_bh(&session->lock);
1875 goto login_mtask_alloc_fail;
1876 }
1877 spin_unlock_bh(&session->lock);
1878
bf32ed33 1879 data = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN, GFP_KERNEL);
d36ab6f3
MC		 1880 if (!data)
1881 goto login_mtask_data_alloc_fail;
c8dc1e52 1882 conn->login_mtask->data = conn->data = data;
d36ab6f3 1883
843c0a8a 1884 init_timer(&conn->tmf_timer);
7996a778
MC		 1885 init_waitqueue_head(&conn->ehwait);
1886
1887 return cls_conn;
1888
d36ab6f3
MC		 1889login_mtask_data_alloc_fail:
1890 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
1891 sizeof(void*));
7996a778 1892login_mtask_alloc_fail:
7996a778
MC		 1893 iscsi_destroy_conn(cls_conn);
1894 return NULL;
1895}
1896EXPORT_SYMBOL_GPL(iscsi_conn_setup);
1897
1898/**
1899 * iscsi_conn_teardown - teardown iscsi connection
1900 * cls_conn: iscsi class connection
1901 *
1902 * TODO: we may need to make this into a two step process
1903 * like scsi-mls remove + put host
1904 */
1905void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
1906{
1907 struct iscsi_conn *conn = cls_conn->dd_data;
1908 struct iscsi_session *session = conn->session;
1909 unsigned long flags;
1910
f6d5180c
MC		 1911 del_timer_sync(&conn->transport_timer);
1912
7996a778
MC		 1913 spin_lock_bh(&session->lock);
1914 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
1915 if (session->leadconn == conn) {
1916 /*
1917 * leading connection? then give up on recovery.
1918 */
1919 session->state = ISCSI_STATE_TERMINATE;
1920 wake_up(&conn->ehwait);
1921 }
1922 spin_unlock_bh(&session->lock);
1923
7996a778
MC		 1924 /*
1925 * Block until all in-progress commands for this connection
1926 * time out or fail.
1927 */
1928 for (;;) {
1929 spin_lock_irqsave(session->host->host_lock, flags);
1930 if (!session->host->host_busy) { /* OK for ERL == 0 */
1931 spin_unlock_irqrestore(session->host->host_lock, flags);
1932 break;
1933 }
1934 spin_unlock_irqrestore(session->host->host_lock, flags);
1935 msleep_interruptible(500);
be2df72e
OG		 1936 printk(KERN_INFO "iscsi: scsi conn_destroy(): host_busy %d "
1937 "host_failed %d\n", session->host->host_busy,
1938 session->host->host_failed);
7996a778
MC		 1939 /*
1940 * force eh_abort() to unblock
1941 */
1942 wake_up(&conn->ehwait);
1943 }
1944
779ea120 1945 /* flush queued up work because we free the connection below */
843c0a8a 1946 iscsi_suspend_tx(conn);
779ea120 1947
7996a778 1948 spin_lock_bh(&session->lock);
c8dc1e52 1949 kfree(conn->data);
f3ff0c36 1950 kfree(conn->persistent_address);
7996a778
MC		 1951 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
1952 sizeof(void*));
e0726407 1953 if (session->leadconn == conn)
7996a778 1954 session->leadconn = NULL;
7996a778
MC		 1955 spin_unlock_bh(&session->lock);
1956
7996a778
MC		 1957 iscsi_destroy_conn(cls_conn);
1958}
1959EXPORT_SYMBOL_GPL(iscsi_conn_teardown);
1960
1961int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
1962{
1963 struct iscsi_conn *conn = cls_conn->dd_data;
1964 struct iscsi_session *session = conn->session;
1965
ffd0436e 1966 if (!session) {
7996a778
MC		 1967 printk(KERN_ERR "iscsi: can't start unbound connection\n");
1968 return -EPERM;
1969 }
1970
db98ccde
MC		 1971 if ((session->imm_data_en || !session->initial_r2t_en) &&
1972 session->first_burst > session->max_burst) {
ffd0436e
MC		 1973 printk("iscsi: invalid burst lengths: "
1974 "first_burst %d max_burst %d\n",
1975 session->first_burst, session->max_burst);
1976 return -EINVAL;
1977 }
1978
f6d5180c
MC		 1979 if (conn->ping_timeout && !conn->recv_timeout) {
1980 printk(KERN_ERR "iscsi: invalid recv timeout of zero "
1981 "Using 5 seconds\n.");
1982 conn->recv_timeout = 5;
1983 }
1984
1985 if (conn->recv_timeout && !conn->ping_timeout) {
1986 printk(KERN_ERR "iscsi: invalid ping timeout of zero "
1987 "Using 5 seconds.\n");
1988 conn->ping_timeout = 5;
1989 }
1990
7996a778
MC		 1991 spin_lock_bh(&session->lock);
1992 conn->c_stage = ISCSI_CONN_STARTED;
1993 session->state = ISCSI_STATE_LOGGED_IN;
e0726407 1994 session->queued_cmdsn = session->cmdsn;
7996a778 1995
f6d5180c
MC		 1996 conn->last_recv = jiffies;
1997 conn->last_ping = jiffies;
1998 if (conn->recv_timeout && conn->ping_timeout)
1999 mod_timer(&conn->transport_timer,
2000 jiffies + (conn->recv_timeout * HZ));
2001
7996a778
MC		 2002 switch(conn->stop_stage) {
2003 case STOP_CONN_RECOVER:
2004 /*
2005 * unblock eh_abort() if it is blocked. re-try all
2006 * commands after successful recovery
2007 */
7996a778 2008 conn->stop_stage = 0;
843c0a8a 2009 conn->tmf_state = TMF_INITIAL;
7996a778 2010 session->age++;
7996a778
MC		 2011 spin_unlock_bh(&session->lock);
2012
2013 iscsi_unblock_session(session_to_cls(session));
2014 wake_up(&conn->ehwait);
2015 return 0;
2016 case STOP_CONN_TERM:
7996a778 2017 conn->stop_stage = 0;
7996a778
MC		 2018 break;
2019 default:
2020 break;
2021 }
2022 spin_unlock_bh(&session->lock);
2023
2024 return 0;
2025}
2026EXPORT_SYMBOL_GPL(iscsi_conn_start);
2027
2028static void
2029flush_control_queues(struct iscsi_session *session, struct iscsi_conn *conn)
2030{
2031 struct iscsi_mgmt_task *mtask, *tmp;
2032
2033 /* handle pending */
843c0a8a
MC		 2034 list_for_each_entry_safe(mtask, tmp, &conn->mgmtqueue, running) {
2035 debug_scsi("flushing pending mgmt task itt 0x%x\n", mtask->itt);
b3a7ea8d 2036 iscsi_free_mgmt_task(conn, mtask);
7996a778
MC		 2037 }
2038
2039 /* handle running */
2040 list_for_each_entry_safe(mtask, tmp, &conn->mgmt_run_list, running) {
2041 debug_scsi("flushing running mgmt task itt 0x%x\n", mtask->itt);
b3a7ea8d 2042 iscsi_free_mgmt_task(conn, mtask);
7996a778
MC		 2043 }
2044
2045 conn->mtask = NULL;
2046}
2047
656cffc9
MC		 2048static void iscsi_start_session_recovery(struct iscsi_session *session,
2049 struct iscsi_conn *conn, int flag)
7996a778 2050{
ed2abc7f
MC		 2051 int old_stop_stage;
2052
f6d5180c
MC		 2053 del_timer_sync(&conn->transport_timer);
2054
6724add1 2055 mutex_lock(&session->eh_mutex);
7996a778 2056 spin_lock_bh(&session->lock);
ed2abc7f 2057 if (conn->stop_stage == STOP_CONN_TERM) {
7996a778 2058 spin_unlock_bh(&session->lock);
6724add1
MC		 2059 mutex_unlock(&session->eh_mutex);
2060 return;
2061 }
2062
2063 /*
2064 * The LLD either freed/unset the lock on us, or userspace called
2065 * stop but did not create a proper connection (connection was never
2066 * bound or it was unbound then stop was called).
2067 */
2068 if (!conn->recv_lock) {
2069 spin_unlock_bh(&session->lock);
2070 mutex_unlock(&session->eh_mutex);
7996a778
MC		 2071 return;
2072 }
ed2abc7f
MC		 2073
2074 /*
2075 * When this is called for the in_login state, we only want to clean
67a61114
MC		 2076 * up the login task and connection. We do not need to block and set
2077 * the recovery state again
ed2abc7f 2078 */
67a61114
MC		 2079 if (flag == STOP_CONN_TERM)
2080 session->state = ISCSI_STATE_TERMINATE;
2081 else if (conn->stop_stage != STOP_CONN_RECOVER)
2082 session->state = ISCSI_STATE_IN_RECOVERY;
ed2abc7f
MC		 2083
2084 old_stop_stage = conn->stop_stage;
7996a778 2085 conn->stop_stage = flag;
67a61114 2086 conn->c_stage = ISCSI_CONN_STOPPED;
7996a778 2087 spin_unlock_bh(&session->lock);
6724add1
MC		 2088
2089 iscsi_suspend_tx(conn);
7996a778 2090
1c83469d
MC		 2091 write_lock_bh(conn->recv_lock);
2092 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
2093 write_unlock_bh(conn->recv_lock);
7996a778 2094
7996a778
MC		 2095 /*
2096 * for connection level recovery we should not calculate
2097 * header digest. conn->hdr_size used for optimization
2098 * in hdr_extract() and will be re-negotiated at
2099 * set_param() time.
2100 */
2101 if (flag == STOP_CONN_RECOVER) {
2102 conn->hdrdgst_en = 0;
2103 conn->datadgst_en = 0;
656cffc9 2104 if (session->state == ISCSI_STATE_IN_RECOVERY &&
67a61114
MC		 2105 old_stop_stage != STOP_CONN_RECOVER) {
2106 debug_scsi("blocking session\n");
7996a778 2107 iscsi_block_session(session_to_cls(session));
67a61114 2108 }
7996a778 2109 }
656cffc9 2110
656cffc9
MC		 2111 /*
2112 * flush queues.
2113 */
2114 spin_lock_bh(&session->lock);
843c0a8a 2115 fail_all_commands(conn, -1);
656cffc9
MC		 2116 flush_control_queues(session, conn);
2117 spin_unlock_bh(&session->lock);
6724add1 2118 mutex_unlock(&session->eh_mutex);
7996a778 2119}
7996a778
MC		 2120
2121void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
2122{
2123 struct iscsi_conn *conn = cls_conn->dd_data;
2124 struct iscsi_session *session = conn->session;
2125
2126 switch (flag) {
2127 case STOP_CONN_RECOVER:
2128 case STOP_CONN_TERM:
2129 iscsi_start_session_recovery(session, conn, flag);
8d2860b3 2130 break;
7996a778 2131 default:
be2df72e 2132 printk(KERN_ERR "iscsi: invalid stop flag %d\n", flag);
7996a778
MC		 2133 }
2134}
2135EXPORT_SYMBOL_GPL(iscsi_conn_stop);
2136
2137int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
2138 struct iscsi_cls_conn *cls_conn, int is_leading)
2139{
2140 struct iscsi_session *session = class_to_transport_session(cls_session);
98644047 2141 struct iscsi_conn *conn = cls_conn->dd_data;
7996a778 2142
7996a778 2143 spin_lock_bh(&session->lock);
7996a778
MC		 2144 if (is_leading)
2145 session->leadconn = conn;
98644047 2146 spin_unlock_bh(&session->lock);
7996a778
MC		 2147
2148 /*
2149 * Unblock xmitworker(), Login Phase will pass through.
2150 */
2151 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
2152 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
2153 return 0;
2154}
2155EXPORT_SYMBOL_GPL(iscsi_conn_bind);
2156
a54a52ca
MC		 2157
2158int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
2159 enum iscsi_param param, char *buf, int buflen)
2160{
2161 struct iscsi_conn *conn = cls_conn->dd_data;
2162 struct iscsi_session *session = conn->session;
2163 uint32_t value;
2164
2165 switch(param) {
843c0a8a
MC		 2166 case ISCSI_PARAM_FAST_ABORT:
2167 sscanf(buf, "%d", &session->fast_abort);
2168 break;
f6d5180c
MC		 2169 case ISCSI_PARAM_ABORT_TMO:
2170 sscanf(buf, "%d", &session->abort_timeout);
2171 break;
2172 case ISCSI_PARAM_LU_RESET_TMO:
2173 sscanf(buf, "%d", &session->lu_reset_timeout);
2174 break;
2175 case ISCSI_PARAM_PING_TMO:
2176 sscanf(buf, "%d", &conn->ping_timeout);
2177 break;
2178 case ISCSI_PARAM_RECV_TMO:
2179 sscanf(buf, "%d", &conn->recv_timeout);
2180 break;
a54a52ca
MC		 2181 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2182 sscanf(buf, "%d", &conn->max_recv_dlength);
2183 break;
2184 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2185 sscanf(buf, "%d", &conn->max_xmit_dlength);
2186 break;
2187 case ISCSI_PARAM_HDRDGST_EN:
2188 sscanf(buf, "%d", &conn->hdrdgst_en);
2189 break;
2190 case ISCSI_PARAM_DATADGST_EN:
2191 sscanf(buf, "%d", &conn->datadgst_en);
2192 break;
2193 case ISCSI_PARAM_INITIAL_R2T_EN:
2194 sscanf(buf, "%d", &session->initial_r2t_en);
2195 break;
2196 case ISCSI_PARAM_MAX_R2T:
2197 sscanf(buf, "%d", &session->max_r2t);
2198 break;
2199 case ISCSI_PARAM_IMM_DATA_EN:
2200 sscanf(buf, "%d", &session->imm_data_en);
2201 break;
2202 case ISCSI_PARAM_FIRST_BURST:
2203 sscanf(buf, "%d", &session->first_burst);
2204 break;
2205 case ISCSI_PARAM_MAX_BURST:
2206 sscanf(buf, "%d", &session->max_burst);
2207 break;
2208 case ISCSI_PARAM_PDU_INORDER_EN:
2209 sscanf(buf, "%d", &session->pdu_inorder_en);
2210 break;
2211 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2212 sscanf(buf, "%d", &session->dataseq_inorder_en);
2213 break;
2214 case ISCSI_PARAM_ERL:
2215 sscanf(buf, "%d", &session->erl);
2216 break;
2217 case ISCSI_PARAM_IFMARKER_EN:
2218 sscanf(buf, "%d", &value);
2219 BUG_ON(value);
2220 break;
2221 case ISCSI_PARAM_OFMARKER_EN:
2222 sscanf(buf, "%d", &value);
2223 BUG_ON(value);
2224 break;
2225 case ISCSI_PARAM_EXP_STATSN:
2226 sscanf(buf, "%u", &conn->exp_statsn);
2227 break;
b2c64167
MC		 2228 case ISCSI_PARAM_USERNAME:
2229 kfree(session->username);
2230 session->username = kstrdup(buf, GFP_KERNEL);
2231 if (!session->username)
2232 return -ENOMEM;
2233 break;
2234 case ISCSI_PARAM_USERNAME_IN:
2235 kfree(session->username_in);
2236 session->username_in = kstrdup(buf, GFP_KERNEL);
2237 if (!session->username_in)
2238 return -ENOMEM;
2239 break;
2240 case ISCSI_PARAM_PASSWORD:
2241 kfree(session->password);
2242 session->password = kstrdup(buf, GFP_KERNEL);
2243 if (!session->password)
2244 return -ENOMEM;
2245 break;
2246 case ISCSI_PARAM_PASSWORD_IN:
2247 kfree(session->password_in);
2248 session->password_in = kstrdup(buf, GFP_KERNEL);
2249 if (!session->password_in)
2250 return -ENOMEM;
2251 break;
a54a52ca
MC		 2252 case ISCSI_PARAM_TARGET_NAME:
2253 /* this should not change between logins */
2254 if (session->targetname)
2255 break;
2256
2257 session->targetname = kstrdup(buf, GFP_KERNEL);
2258 if (!session->targetname)
2259 return -ENOMEM;
2260 break;
2261 case ISCSI_PARAM_TPGT:
2262 sscanf(buf, "%d", &session->tpgt);
2263 break;
2264 case ISCSI_PARAM_PERSISTENT_PORT:
2265 sscanf(buf, "%d", &conn->persistent_port);
2266 break;
2267 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2268 /*
2269 * this is the address returned in discovery so it should
2270 * not change between logins.
2271 */
2272 if (conn->persistent_address)
2273 break;
2274
2275 conn->persistent_address = kstrdup(buf, GFP_KERNEL);
2276 if (!conn->persistent_address)
2277 return -ENOMEM;
2278 break;
2279 default:
2280 return -ENOSYS;
2281 }
2282
2283 return 0;
2284}
2285EXPORT_SYMBOL_GPL(iscsi_set_param);
2286
2287int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
2288 enum iscsi_param param, char *buf)
2289{
2290 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
2291 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
2292 int len;
2293
2294 switch(param) {
843c0a8a
MC		 2295 case ISCSI_PARAM_FAST_ABORT:
2296 len = sprintf(buf, "%d\n", session->fast_abort);
2297 break;
f6d5180c
MC		 2298 case ISCSI_PARAM_ABORT_TMO:
2299 len = sprintf(buf, "%d\n", session->abort_timeout);
2300 break;
2301 case ISCSI_PARAM_LU_RESET_TMO:
2302 len = sprintf(buf, "%d\n", session->lu_reset_timeout);
2303 break;
a54a52ca
MC		 2304 case ISCSI_PARAM_INITIAL_R2T_EN:
2305 len = sprintf(buf, "%d\n", session->initial_r2t_en);
2306 break;
2307 case ISCSI_PARAM_MAX_R2T:
2308 len = sprintf(buf, "%hu\n", session->max_r2t);
2309 break;
2310 case ISCSI_PARAM_IMM_DATA_EN:
2311 len = sprintf(buf, "%d\n", session->imm_data_en);
2312 break;
2313 case ISCSI_PARAM_FIRST_BURST:
2314 len = sprintf(buf, "%u\n", session->first_burst);
2315 break;
2316 case ISCSI_PARAM_MAX_BURST:
2317 len = sprintf(buf, "%u\n", session->max_burst);
2318 break;
2319 case ISCSI_PARAM_PDU_INORDER_EN:
2320 len = sprintf(buf, "%d\n", session->pdu_inorder_en);
2321 break;
2322 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2323 len = sprintf(buf, "%d\n", session->dataseq_inorder_en);
2324 break;
2325 case ISCSI_PARAM_ERL:
2326 len = sprintf(buf, "%d\n", session->erl);
2327 break;
2328 case ISCSI_PARAM_TARGET_NAME:
2329 len = sprintf(buf, "%s\n", session->targetname);
2330 break;
2331 case ISCSI_PARAM_TPGT:
2332 len = sprintf(buf, "%d\n", session->tpgt);
2333 break;
b2c64167
MC		 2334 case ISCSI_PARAM_USERNAME:
2335 len = sprintf(buf, "%s\n", session->username);
2336 break;
2337 case ISCSI_PARAM_USERNAME_IN:
2338 len = sprintf(buf, "%s\n", session->username_in);
2339 break;
2340 case ISCSI_PARAM_PASSWORD:
2341 len = sprintf(buf, "%s\n", session->password);
2342 break;
2343 case ISCSI_PARAM_PASSWORD_IN:
2344 len = sprintf(buf, "%s\n", session->password_in);
2345 break;
a54a52ca
MC		 2346 default:
2347 return -ENOSYS;
2348 }
2349
2350 return len;
2351}
2352EXPORT_SYMBOL_GPL(iscsi_session_get_param);
2353
2354int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
2355 enum iscsi_param param, char *buf)
2356{
2357 struct iscsi_conn *conn = cls_conn->dd_data;
2358 int len;
2359
2360 switch(param) {
f6d5180c
MC		 2361 case ISCSI_PARAM_PING_TMO:
2362 len = sprintf(buf, "%u\n", conn->ping_timeout);
2363 break;
2364 case ISCSI_PARAM_RECV_TMO:
2365 len = sprintf(buf, "%u\n", conn->recv_timeout);
2366 break;
a54a52ca
MC		 2367 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2368 len = sprintf(buf, "%u\n", conn->max_recv_dlength);
2369 break;
2370 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2371 len = sprintf(buf, "%u\n", conn->max_xmit_dlength);
2372 break;
2373 case ISCSI_PARAM_HDRDGST_EN:
2374 len = sprintf(buf, "%d\n", conn->hdrdgst_en);
2375 break;
2376 case ISCSI_PARAM_DATADGST_EN:
2377 len = sprintf(buf, "%d\n", conn->datadgst_en);
2378 break;
2379 case ISCSI_PARAM_IFMARKER_EN:
2380 len = sprintf(buf, "%d\n", conn->ifmarker_en);
2381 break;
2382 case ISCSI_PARAM_OFMARKER_EN:
2383 len = sprintf(buf, "%d\n", conn->ofmarker_en);
2384 break;
2385 case ISCSI_PARAM_EXP_STATSN:
2386 len = sprintf(buf, "%u\n", conn->exp_statsn);
2387 break;
2388 case ISCSI_PARAM_PERSISTENT_PORT:
2389 len = sprintf(buf, "%d\n", conn->persistent_port);
2390 break;
2391 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2392 len = sprintf(buf, "%s\n", conn->persistent_address);
2393 break;
2394 default:
2395 return -ENOSYS;
2396 }
2397
2398 return len;
2399}
2400EXPORT_SYMBOL_GPL(iscsi_conn_get_param);
2401
0801c242
MC		 2402int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2403 char *buf)
2404{
2405 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
2406 int len;
2407
2408 switch (param) {
d8196ed2
MC		 2409 case ISCSI_HOST_PARAM_NETDEV_NAME:
2410 if (!session->netdev)
2411 len = sprintf(buf, "%s\n", "default");
2412 else
2413 len = sprintf(buf, "%s\n", session->netdev);
2414 break;
0801c242
MC		 2415 case ISCSI_HOST_PARAM_HWADDRESS:
2416 if (!session->hwaddress)
2417 len = sprintf(buf, "%s\n", "default");
2418 else
2419 len = sprintf(buf, "%s\n", session->hwaddress);
2420 break;
8ad5781a
MC		 2421 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2422 if (!session->initiatorname)
2423 len = sprintf(buf, "%s\n", "unknown");
2424 else
2425 len = sprintf(buf, "%s\n", session->initiatorname);
2426 break;
2427
0801c242
MC		 2428 default:
2429 return -ENOSYS;
2430 }
2431
2432 return len;
2433}
2434EXPORT_SYMBOL_GPL(iscsi_host_get_param);
2435
2436int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2437 char *buf, int buflen)
2438{
2439 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
2440
2441 switch (param) {
d8196ed2
MC		 2442 case ISCSI_HOST_PARAM_NETDEV_NAME:
2443 if (!session->netdev)
2444 session->netdev = kstrdup(buf, GFP_KERNEL);
2445 break;
0801c242
MC		 2446 case ISCSI_HOST_PARAM_HWADDRESS:
2447 if (!session->hwaddress)
2448 session->hwaddress = kstrdup(buf, GFP_KERNEL);
2449 break;
8ad5781a
MC		 2450 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2451 if (!session->initiatorname)
2452 session->initiatorname = kstrdup(buf, GFP_KERNEL);
2453 break;
0801c242
MC		 2454 default:
2455 return -ENOSYS;
2456 }
2457
2458 return 0;
2459}
2460EXPORT_SYMBOL_GPL(iscsi_host_set_param);
2461
7996a778
MC		 2462MODULE_AUTHOR("Mike Christie");
2463MODULE_DESCRIPTION("iSCSI library functions");
2464MODULE_LICENSE("GPL");
Clone of davem's net-next-2.6 tree