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[SCSI] iscsi: Some fixes in preparation for bidirectional support - exp_datasn
[deliverable/linux.git] / drivers / scsi / libiscsi.c
CommitLineData
7996a778
MC		 1/*
2 * iSCSI lib functions
3 *
4 * Copyright (C) 2006 Red Hat, Inc. All rights reserved.
5 * Copyright (C) 2004 - 2006 Mike Christie
6 * Copyright (C) 2004 - 2005 Dmitry Yusupov
7 * Copyright (C) 2004 - 2005 Alex Aizman
8 * maintained by open-iscsi@googlegroups.com
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23 */
24#include <linux/types.h>
25#include <linux/mutex.h>
26#include <linux/kfifo.h>
27#include <linux/delay.h>
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
49#define INVALID_SN_DELTA 0xffff
50
51int
52iscsi_check_assign_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr)
53{
54 uint32_t max_cmdsn = be32_to_cpu(hdr->max_cmdsn);
55 uint32_t exp_cmdsn = be32_to_cpu(hdr->exp_cmdsn);
56
57 if (max_cmdsn < exp_cmdsn -1 &&
58 max_cmdsn > exp_cmdsn - INVALID_SN_DELTA)
59 return ISCSI_ERR_MAX_CMDSN;
60 if (max_cmdsn > session->max_cmdsn ||
61 max_cmdsn < session->max_cmdsn - INVALID_SN_DELTA)
62 session->max_cmdsn = max_cmdsn;
63 if (exp_cmdsn > session->exp_cmdsn ||
64 exp_cmdsn < session->exp_cmdsn - INVALID_SN_DELTA)
65 session->exp_cmdsn = exp_cmdsn;
66
67 return 0;
68}
69EXPORT_SYMBOL_GPL(iscsi_check_assign_cmdsn);
70
71void iscsi_prep_unsolicit_data_pdu(struct iscsi_cmd_task *ctask,
ffd0436e 72 struct iscsi_data *hdr)
7996a778
MC		 73{
74 struct iscsi_conn *conn = ctask->conn;
75
76 memset(hdr, 0, sizeof(struct iscsi_data));
77 hdr->ttt = cpu_to_be32(ISCSI_RESERVED_TAG);
78 hdr->datasn = cpu_to_be32(ctask->unsol_datasn);
79 ctask->unsol_datasn++;
80 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
81 memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
82
83 hdr->itt = ctask->hdr->itt;
84 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
ffd0436e 85 hdr->offset = cpu_to_be32(ctask->unsol_offset);
7996a778
MC		 86
87 if (ctask->unsol_count > conn->max_xmit_dlength) {
88 hton24(hdr->dlength, conn->max_xmit_dlength);
89 ctask->data_count = conn->max_xmit_dlength;
ffd0436e 90 ctask->unsol_offset += ctask->data_count;
7996a778
MC		 91 hdr->flags = 0;
92 } else {
93 hton24(hdr->dlength, ctask->unsol_count);
94 ctask->data_count = ctask->unsol_count;
95 hdr->flags = ISCSI_FLAG_CMD_FINAL;
96 }
97}
98EXPORT_SYMBOL_GPL(iscsi_prep_unsolicit_data_pdu);
99
100/**
101 * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
102 * @ctask: iscsi cmd task
103 *
104 * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set
105 * fields like dlength or final based on how much data it sends
106 */
107static void iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask)
108{
109 struct iscsi_conn *conn = ctask->conn;
110 struct iscsi_session *session = conn->session;
111 struct iscsi_cmd *hdr = ctask->hdr;
112 struct scsi_cmnd *sc = ctask->sc;
113
114 hdr->opcode = ISCSI_OP_SCSI_CMD;
115 hdr->flags = ISCSI_ATTR_SIMPLE;
116 int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun);
b4377356 117 hdr->itt = build_itt(ctask->itt, conn->id, session->age);
7996a778
MC		 118 hdr->data_length = cpu_to_be32(sc->request_bufflen);
119 hdr->cmdsn = cpu_to_be32(session->cmdsn);
120 session->cmdsn++;
121 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
122 memcpy(hdr->cdb, sc->cmnd, sc->cmd_len);
d473cc7f
MC		 123 if (sc->cmd_len < MAX_COMMAND_SIZE)
124 memset(&hdr->cdb[sc->cmd_len], 0,
125 MAX_COMMAND_SIZE - sc->cmd_len);
7996a778 126
ffd0436e 127 ctask->data_count = 0;
7996a778
MC		 128 if (sc->sc_data_direction == DMA_TO_DEVICE) {
129 hdr->flags |= ISCSI_FLAG_CMD_WRITE;
130 /*
131 * Write counters:
132 *
133 * imm_count bytes to be sent right after
134 * SCSI PDU Header
135 *
136 * unsol_count bytes(as Data-Out) to be sent
137 * without R2T ack right after
138 * immediate data
139 *
140 * r2t_data_count bytes to be sent via R2T ack's
141 *
142 * pad_count bytes to be sent as zero-padding
143 */
144 ctask->imm_count = 0;
145 ctask->unsol_count = 0;
ffd0436e 146 ctask->unsol_offset = 0;
7996a778
MC		 147 ctask->unsol_datasn = 0;
148
149 if (session->imm_data_en) {
150 if (ctask->total_length >= session->first_burst)
151 ctask->imm_count = min(session->first_burst,
152 conn->max_xmit_dlength);
153 else
154 ctask->imm_count = min(ctask->total_length,
155 conn->max_xmit_dlength);
156 hton24(ctask->hdr->dlength, ctask->imm_count);
157 } else
158 zero_data(ctask->hdr->dlength);
159
ffd0436e 160 if (!session->initial_r2t_en) {
7996a778
MC		 161 ctask->unsol_count = min(session->first_burst,
162 ctask->total_length) - ctask->imm_count;
ffd0436e
MC		 163 ctask->unsol_offset = ctask->imm_count;
164 }
165
7996a778
MC		 166 if (!ctask->unsol_count)
167 /* No unsolicit Data-Out's */
168 ctask->hdr->flags |= ISCSI_FLAG_CMD_FINAL;
169 } else {
7996a778
MC		 170 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
171 zero_data(hdr->dlength);
172
173 if (sc->sc_data_direction == DMA_FROM_DEVICE)
174 hdr->flags |= ISCSI_FLAG_CMD_READ;
175 }
176
177 conn->scsicmd_pdus_cnt++;
178}
179EXPORT_SYMBOL_GPL(iscsi_prep_scsi_cmd_pdu);
180
181/**
182 * iscsi_complete_command - return command back to scsi-ml
7996a778
MC		 183 * @ctask: iscsi cmd task
184 *
185 * Must be called with session lock.
186 * This function returns the scsi command to scsi-ml and returns
187 * the cmd task to the pool of available cmd tasks.
188 */
60ecebf5 189static void iscsi_complete_command(struct iscsi_cmd_task *ctask)
7996a778 190{
60ecebf5 191 struct iscsi_session *session = ctask->conn->session;
7996a778
MC		 192 struct scsi_cmnd *sc = ctask->sc;
193
b6c395ed 194 ctask->state = ISCSI_TASK_COMPLETED;
7996a778 195 ctask->sc = NULL;
f47f2cf5
MC		 196 /* SCSI eh reuses commands to verify us */
197 sc->SCp.ptr = NULL;
7996a778
MC		 198 list_del_init(&ctask->running);
199 __kfifo_put(session->cmdpool.queue, (void*)&ctask, sizeof(void*));
200 sc->scsi_done(sc);
201}
202
60ecebf5
MC		 203static void __iscsi_get_ctask(struct iscsi_cmd_task *ctask)
204{
205 atomic_inc(&ctask->refcount);
206}
207
208static void iscsi_get_ctask(struct iscsi_cmd_task *ctask)
209{
210 spin_lock_bh(&ctask->conn->session->lock);
211 __iscsi_get_ctask(ctask);
212 spin_unlock_bh(&ctask->conn->session->lock);
213}
214
215static void __iscsi_put_ctask(struct iscsi_cmd_task *ctask)
216{
e648f63c 217 if (atomic_dec_and_test(&ctask->refcount))
60ecebf5 218 iscsi_complete_command(ctask);
60ecebf5
MC		 219}
220
221static void iscsi_put_ctask(struct iscsi_cmd_task *ctask)
222{
223 spin_lock_bh(&ctask->conn->session->lock);
224 __iscsi_put_ctask(ctask);
225 spin_unlock_bh(&ctask->conn->session->lock);
226}
227
7996a778
MC		 228/**
229 * iscsi_cmd_rsp - SCSI Command Response processing
230 * @conn: iscsi connection
231 * @hdr: iscsi header
232 * @ctask: scsi command task
233 * @data: cmd data buffer
234 * @datalen: len of buffer
235 *
236 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and
237 * then completes the command and task.
238 **/
239static int iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
240 struct iscsi_cmd_task *ctask, char *data,
241 int datalen)
242{
243 int rc;
244 struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)hdr;
245 struct iscsi_session *session = conn->session;
246 struct scsi_cmnd *sc = ctask->sc;
247
248 rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr);
249 if (rc) {
250 sc->result = DID_ERROR << 16;
251 goto out;
252 }
253
254 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
255
256 sc->result = (DID_OK << 16) | rhdr->cmd_status;
257
258 if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) {
259 sc->result = DID_ERROR << 16;
260 goto out;
261 }
262
263 if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) {
9b80cb4b 264 uint16_t senselen;
7996a778
MC		 265
266 if (datalen < 2) {
267invalid_datalen:
be2df72e
OG		 268 printk(KERN_ERR "iscsi: Got CHECK_CONDITION but "
269 "invalid data buffer size of %d\n", datalen);
7996a778
MC		 270 sc->result = DID_BAD_TARGET << 16;
271 goto out;
272 }
273
8eb00539 274 senselen = be16_to_cpu(get_unaligned((__be16 *) data));
7996a778
MC		 275 if (datalen < senselen)
276 goto invalid_datalen;
277
278 memcpy(sc->sense_buffer, data + 2,
9b80cb4b 279 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
7996a778 280 debug_scsi("copied %d bytes of sense\n",
8eb00539 281 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
7996a778
MC		 282 }
283
284 if (sc->sc_data_direction == DMA_TO_DEVICE)
285 goto out;
286
287 if (rhdr->flags & ISCSI_FLAG_CMD_UNDERFLOW) {
288 int res_count = be32_to_cpu(rhdr->residual_count);
289
290 if (res_count > 0 && res_count <= sc->request_bufflen)
291 sc->resid = res_count;
292 else
293 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
294 } else if (rhdr->flags & ISCSI_FLAG_CMD_BIDI_UNDERFLOW)
295 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
296 else if (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW)
297 sc->resid = be32_to_cpu(rhdr->residual_count);
298
299out:
300 debug_scsi("done [sc %lx res %d itt 0x%x]\n",
301 (long)sc, sc->result, ctask->itt);
302 conn->scsirsp_pdus_cnt++;
303
60ecebf5 304 __iscsi_put_ctask(ctask);
7996a778
MC		 305 return rc;
306}
307
7ea8b828
MC		 308static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
309{
310 struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr;
311
312 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
313 conn->tmfrsp_pdus_cnt++;
314
315 if (conn->tmabort_state != TMABORT_INITIAL)
316 return;
317
318 if (tmf->response == ISCSI_TMF_RSP_COMPLETE)
319 conn->tmabort_state = TMABORT_SUCCESS;
320 else if (tmf->response == ISCSI_TMF_RSP_NO_TASK)
321 conn->tmabort_state = TMABORT_NOT_FOUND;
322 else
323 conn->tmabort_state = TMABORT_FAILED;
324 wake_up(&conn->ehwait);
325}
326
62f38300
MC		 327static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
328 char *data, int datalen)
329{
330 struct iscsi_reject *reject = (struct iscsi_reject *)hdr;
331 struct iscsi_hdr rejected_pdu;
332 uint32_t itt;
333
334 conn->exp_statsn = be32_to_cpu(reject->statsn) + 1;
335
336 if (reject->reason == ISCSI_REASON_DATA_DIGEST_ERROR) {
337 if (ntoh24(reject->dlength) > datalen)
338 return ISCSI_ERR_PROTO;
339
340 if (ntoh24(reject->dlength) >= sizeof(struct iscsi_hdr)) {
341 memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr));
b4377356 342 itt = get_itt(rejected_pdu.itt);
62f38300
MC		 343 printk(KERN_ERR "itt 0x%x had pdu (op 0x%x) rejected "
344 "due to DataDigest error.\n", itt,
345 rejected_pdu.opcode);
346 }
347 }
348 return 0;
349}
350
7996a778
MC		 351/**
352 * __iscsi_complete_pdu - complete pdu
353 * @conn: iscsi conn
354 * @hdr: iscsi header
355 * @data: data buffer
356 * @datalen: len of data buffer
357 *
358 * Completes pdu processing by freeing any resources allocated at
359 * queuecommand or send generic. session lock must be held and verify
360 * itt must have been called.
361 */
362int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
363 char *data, int datalen)
364{
365 struct iscsi_session *session = conn->session;
366 int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0;
367 struct iscsi_cmd_task *ctask;
368 struct iscsi_mgmt_task *mtask;
369 uint32_t itt;
370
b4377356
AV		 371 if (hdr->itt != RESERVED_ITT)
372 itt = get_itt(hdr->itt);
7996a778 373 else
b4377356 374 itt = ~0U;
7996a778
MC		 375
376 if (itt < session->cmds_max) {
377 ctask = session->cmds[itt];
378
379 debug_scsi("cmdrsp [op 0x%x cid %d itt 0x%x len %d]\n",
380 opcode, conn->id, ctask->itt, datalen);
381
382 switch(opcode) {
383 case ISCSI_OP_SCSI_CMD_RSP:
384 BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
385 rc = iscsi_scsi_cmd_rsp(conn, hdr, ctask, data,
386 datalen);
387 break;
388 case ISCSI_OP_SCSI_DATA_IN:
389 BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
390 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
391 conn->scsirsp_pdus_cnt++;
60ecebf5 392 __iscsi_put_ctask(ctask);
7996a778
MC		 393 }
394 break;
395 case ISCSI_OP_R2T:
396 /* LLD handles this for now */
397 break;
398 default:
399 rc = ISCSI_ERR_BAD_OPCODE;
400 break;
401 }
402 } else if (itt >= ISCSI_MGMT_ITT_OFFSET &&
403 itt < ISCSI_MGMT_ITT_OFFSET + session->mgmtpool_max) {
404 mtask = session->mgmt_cmds[itt - ISCSI_MGMT_ITT_OFFSET];
405
406 debug_scsi("immrsp [op 0x%x cid %d itt 0x%x len %d]\n",
407 opcode, conn->id, mtask->itt, datalen);
408
8d2860b3
MC		 409 rc = iscsi_check_assign_cmdsn(session,
410 (struct iscsi_nopin*)hdr);
411 if (rc)
412 goto done;
413
7996a778 414 switch(opcode) {
8d2860b3 415 case ISCSI_OP_LOGOUT_RSP:
c8dc1e52
MC		 416 if (datalen) {
417 rc = ISCSI_ERR_PROTO;
418 break;
419 }
8d2860b3
MC		 420 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
421 /* fall through */
7996a778
MC		 422 case ISCSI_OP_LOGIN_RSP:
423 case ISCSI_OP_TEXT_RSP:
8d2860b3
MC		 424 /*
425 * login related PDU's exp_statsn is handled in
426 * userspace
427 */
40527afe
MC		 428 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
429 rc = ISCSI_ERR_CONN_FAILED;
7996a778
MC		 430 list_del(&mtask->running);
431 if (conn->login_mtask != mtask)
432 __kfifo_put(session->mgmtpool.queue,
433 (void*)&mtask, sizeof(void*));
434 break;
435 case ISCSI_OP_SCSI_TMFUNC_RSP:
7996a778
MC		 436 if (datalen) {
437 rc = ISCSI_ERR_PROTO;
438 break;
439 }
8d2860b3 440
7ea8b828 441 iscsi_tmf_rsp(conn, hdr);
7996a778
MC		 442 break;
443 case ISCSI_OP_NOOP_IN:
b4377356 444 if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) {
7996a778
MC		 445 rc = ISCSI_ERR_PROTO;
446 break;
447 }
7996a778
MC		 448 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
449
40527afe
MC		 450 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
451 rc = ISCSI_ERR_CONN_FAILED;
7996a778
MC		 452 list_del(&mtask->running);
453 if (conn->login_mtask != mtask)
454 __kfifo_put(session->mgmtpool.queue,
455 (void*)&mtask, sizeof(void*));
456 break;
457 default:
458 rc = ISCSI_ERR_BAD_OPCODE;
459 break;
460 }
b4377356 461 } else if (itt == ~0U) {
62f38300
MC		 462 rc = iscsi_check_assign_cmdsn(session,
463 (struct iscsi_nopin*)hdr);
464 if (rc)
465 goto done;
466
7996a778
MC		 467 switch(opcode) {
468 case ISCSI_OP_NOOP_IN:
40527afe 469 if (datalen) {
7996a778 470 rc = ISCSI_ERR_PROTO;
40527afe
MC		 471 break;
472 }
473
b4377356 474 if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG))
40527afe
MC		 475 break;
476
477 if (iscsi_recv_pdu(conn->cls_conn, hdr, NULL, 0))
478 rc = ISCSI_ERR_CONN_FAILED;
7996a778
MC		 479 break;
480 case ISCSI_OP_REJECT:
62f38300
MC		 481 rc = iscsi_handle_reject(conn, hdr, data, datalen);
482 break;
7996a778 483 case ISCSI_OP_ASYNC_EVENT:
8d2860b3 484 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
5831c737
MC		 485 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
486 rc = ISCSI_ERR_CONN_FAILED;
7996a778
MC		 487 break;
488 default:
489 rc = ISCSI_ERR_BAD_OPCODE;
490 break;
491 }
492 } else
493 rc = ISCSI_ERR_BAD_ITT;
494
8d2860b3 495done:
7996a778
MC		 496 return rc;
497}
498EXPORT_SYMBOL_GPL(__iscsi_complete_pdu);
499
500int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
501 char *data, int datalen)
502{
503 int rc;
504
505 spin_lock(&conn->session->lock);
506 rc = __iscsi_complete_pdu(conn, hdr, data, datalen);
507 spin_unlock(&conn->session->lock);
508 return rc;
509}
510EXPORT_SYMBOL_GPL(iscsi_complete_pdu);
511
512/* verify itt (itt encoding: age+cid+itt) */
513int iscsi_verify_itt(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
514 uint32_t *ret_itt)
515{
516 struct iscsi_session *session = conn->session;
517 struct iscsi_cmd_task *ctask;
518 uint32_t itt;
519
b4377356
AV		 520 if (hdr->itt != RESERVED_ITT) {
521 if (((__force u32)hdr->itt & ISCSI_AGE_MASK) !=
7996a778 522 (session->age << ISCSI_AGE_SHIFT)) {
be2df72e 523 printk(KERN_ERR "iscsi: received itt %x expected "
b4377356 524 "session age (%x)\n", (__force u32)hdr->itt,
7996a778
MC		 525 session->age & ISCSI_AGE_MASK);
526 return ISCSI_ERR_BAD_ITT;
527 }
528
b4377356 529 if (((__force u32)hdr->itt & ISCSI_CID_MASK) !=
7996a778 530 (conn->id << ISCSI_CID_SHIFT)) {
be2df72e 531 printk(KERN_ERR "iscsi: received itt %x, expected "
b4377356 532 "CID (%x)\n", (__force u32)hdr->itt, conn->id);
7996a778
MC		 533 return ISCSI_ERR_BAD_ITT;
534 }
b4377356 535 itt = get_itt(hdr->itt);
7996a778 536 } else
b4377356 537 itt = ~0U;
7996a778
MC		 538
539 if (itt < session->cmds_max) {
540 ctask = session->cmds[itt];
541
542 if (!ctask->sc) {
be2df72e 543 printk(KERN_INFO "iscsi: dropping ctask with "
7996a778
MC		 544 "itt 0x%x\n", ctask->itt);
545 /* force drop */
546 return ISCSI_ERR_NO_SCSI_CMD;
547 }
548
549 if (ctask->sc->SCp.phase != session->age) {
be2df72e 550 printk(KERN_ERR "iscsi: ctask's session age %d, "
7996a778
MC		 551 "expected %d\n", ctask->sc->SCp.phase,
552 session->age);
553 return ISCSI_ERR_SESSION_FAILED;
554 }
555 }
556
557 *ret_itt = itt;
558 return 0;
559}
560EXPORT_SYMBOL_GPL(iscsi_verify_itt);
561
562void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
563{
564 struct iscsi_session *session = conn->session;
565 unsigned long flags;
566
567 spin_lock_irqsave(&session->lock, flags);
656cffc9
MC		 568 if (session->state == ISCSI_STATE_FAILED) {
569 spin_unlock_irqrestore(&session->lock, flags);
570 return;
571 }
572
67a61114 573 if (conn->stop_stage == 0)
7996a778
MC		 574 session->state = ISCSI_STATE_FAILED;
575 spin_unlock_irqrestore(&session->lock, flags);
576 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
577 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
578 iscsi_conn_error(conn->cls_conn, err);
579}
580EXPORT_SYMBOL_GPL(iscsi_conn_failure);
581
05db888a 582static int iscsi_xmit_mtask(struct iscsi_conn *conn)
b5072ea0
MC		 583{
584 struct iscsi_hdr *hdr = conn->mtask->hdr;
585 int rc, was_logout = 0;
586
587 if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT) {
588 conn->session->state = ISCSI_STATE_IN_RECOVERY;
589 iscsi_block_session(session_to_cls(conn->session));
590 was_logout = 1;
591 }
592 rc = conn->session->tt->xmit_mgmt_task(conn, conn->mtask);
593 if (rc)
594 return rc;
595
05db888a
MC		 596 /* done with this in-progress mtask */
597 conn->mtask = NULL;
598
b5072ea0
MC		 599 if (was_logout) {
600 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
601 return -ENODATA;
602 }
603 return 0;
604}
605
7996a778
MC		 606/**
607 * iscsi_data_xmit - xmit any command into the scheduled connection
608 * @conn: iscsi connection
609 *
610 * Notes:
611 * The function can return -EAGAIN in which case the caller must
612 * re-schedule it again later or recover. '0' return code means
613 * successful xmit.
614 **/
615static int iscsi_data_xmit(struct iscsi_conn *conn)
616{
617 struct iscsi_transport *tt;
3219e529 618 int rc = 0;
7996a778
MC		 619
620 if (unlikely(conn->suspend_tx)) {
621 debug_scsi("conn %d Tx suspended!\n", conn->id);
3219e529 622 return -ENODATA;
7996a778
MC		 623 }
624 tt = conn->session->tt;
625
626 /*
627 * Transmit in the following order:
628 *
629 * 1) un-finished xmit (ctask or mtask)
630 * 2) immediate control PDUs
631 * 3) write data
632 * 4) SCSI commands
633 * 5) non-immediate control PDUs
634 *
635 * No need to lock around __kfifo_get as long as
636 * there's one producer and one consumer.
637 */
638
639 BUG_ON(conn->ctask && conn->mtask);
640
641 if (conn->ctask) {
60ecebf5 642 iscsi_get_ctask(conn->ctask);
3219e529 643 rc = tt->xmit_cmd_task(conn, conn->ctask);
60ecebf5 644 iscsi_put_ctask(conn->ctask);
3219e529 645 if (rc)
7996a778
MC		 646 goto again;
647 /* done with this in-progress ctask */
648 conn->ctask = NULL;
649 }
650 if (conn->mtask) {
05db888a 651 rc = iscsi_xmit_mtask(conn);
3219e529 652 if (rc)
7996a778 653 goto again;
7996a778
MC		 654 }
655
656 /* process immediate first */
657 if (unlikely(__kfifo_len(conn->immqueue))) {
658 while (__kfifo_get(conn->immqueue, (void*)&conn->mtask,
659 sizeof(void*))) {
994442e8 660 spin_lock_bh(&conn->session->lock);
7996a778
MC		 661 list_add_tail(&conn->mtask->running,
662 &conn->mgmt_run_list);
994442e8 663 spin_unlock_bh(&conn->session->lock);
05db888a 664 rc = iscsi_xmit_mtask(conn);
3219e529 665 if (rc)
7996a778
MC		 666 goto again;
667 }
7996a778
MC		 668 }
669
670 /* process command queue */
b6c395ed
MC		 671 spin_lock_bh(&conn->session->lock);
672 while (!list_empty(&conn->xmitqueue)) {
7996a778
MC		 673 /*
674 * iscsi tcp may readd the task to the xmitqueue to send
675 * write data
676 */
b6c395ed
MC		 677 conn->ctask = list_entry(conn->xmitqueue.next,
678 struct iscsi_cmd_task, running);
679 conn->ctask->state = ISCSI_TASK_RUNNING;
680 list_move_tail(conn->xmitqueue.next, &conn->run_list);
60ecebf5 681 __iscsi_get_ctask(conn->ctask);
994442e8 682 spin_unlock_bh(&conn->session->lock);
b6c395ed 683
3219e529 684 rc = tt->xmit_cmd_task(conn, conn->ctask);
60ecebf5 685
b6c395ed 686 spin_lock_bh(&conn->session->lock);
60ecebf5
MC		 687 __iscsi_put_ctask(conn->ctask);
688 if (rc) {
689 spin_unlock_bh(&conn->session->lock);
690 goto again;
691 }
7996a778 692 }
b6c395ed 693 spin_unlock_bh(&conn->session->lock);
7996a778
MC		 694 /* done with this ctask */
695 conn->ctask = NULL;
696
697 /* process the rest control plane PDUs, if any */
698 if (unlikely(__kfifo_len(conn->mgmtqueue))) {
699 while (__kfifo_get(conn->mgmtqueue, (void*)&conn->mtask,
700 sizeof(void*))) {
994442e8 701 spin_lock_bh(&conn->session->lock);
7996a778
MC		 702 list_add_tail(&conn->mtask->running,
703 &conn->mgmt_run_list);
994442e8 704 spin_unlock_bh(&conn->session->lock);
05db888a
MC		 705 rc = iscsi_xmit_mtask(conn);
706 if (rc)
7996a778
MC		 707 goto again;
708 }
7996a778
MC		 709 }
710
3219e529 711 return -ENODATA;
7996a778
MC		 712
713again:
714 if (unlikely(conn->suspend_tx))
3219e529 715 return -ENODATA;
7996a778 716
3219e529 717 return rc;
7996a778
MC		 718}
719
c4028958 720static void iscsi_xmitworker(struct work_struct *work)
7996a778 721{
c4028958
DH		 722 struct iscsi_conn *conn =
723 container_of(work, struct iscsi_conn, xmitwork);
3219e529 724 int rc;
7996a778
MC		 725 /*
726 * serialize Xmit worker on a per-connection basis.
727 */
728 mutex_lock(&conn->xmitmutex);
3219e529
MC		 729 do {
730 rc = iscsi_data_xmit(conn);
731 } while (rc >= 0 || rc == -EAGAIN);
7996a778
MC		 732 mutex_unlock(&conn->xmitmutex);
733}
734
735enum {
736 FAILURE_BAD_HOST = 1,
737 FAILURE_SESSION_FAILED,
738 FAILURE_SESSION_FREED,
739 FAILURE_WINDOW_CLOSED,
60ecebf5 740 FAILURE_OOM,
7996a778 741 FAILURE_SESSION_TERMINATE,
656cffc9 742 FAILURE_SESSION_IN_RECOVERY,
7996a778
MC		 743 FAILURE_SESSION_RECOVERY_TIMEOUT,
744};
745
746int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
747{
748 struct Scsi_Host *host;
749 int reason = 0;
750 struct iscsi_session *session;
751 struct iscsi_conn *conn;
752 struct iscsi_cmd_task *ctask = NULL;
753
754 sc->scsi_done = done;
755 sc->result = 0;
f47f2cf5 756 sc->SCp.ptr = NULL;
7996a778
MC		 757
758 host = sc->device->host;
759 session = iscsi_hostdata(host->hostdata);
760
761 spin_lock(&session->lock);
762
656cffc9
MC		 763 /*
764 * ISCSI_STATE_FAILED is a temp. state. The recovery
765 * code will decide what is best to do with command queued
766 * during this time
767 */
768 if (session->state != ISCSI_STATE_LOGGED_IN &&
769 session->state != ISCSI_STATE_FAILED) {
770 /*
771 * to handle the race between when we set the recovery state
772 * and block the session we requeue here (commands could
773 * be entering our queuecommand while a block is starting
774 * up because the block code is not locked)
775 */
776 if (session->state == ISCSI_STATE_IN_RECOVERY) {
777 reason = FAILURE_SESSION_IN_RECOVERY;
67a61114 778 goto reject;
7996a778 779 }
656cffc9
MC		 780
781 if (session->state == ISCSI_STATE_RECOVERY_FAILED)
782 reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
783 else if (session->state == ISCSI_STATE_TERMINATE)
784 reason = FAILURE_SESSION_TERMINATE;
785 else
786 reason = FAILURE_SESSION_FREED;
7996a778
MC		 787 goto fault;
788 }
789
790 /*
791 * Check for iSCSI window and take care of CmdSN wrap-around
792 */
793 if ((int)(session->max_cmdsn - session->cmdsn) < 0) {
794 reason = FAILURE_WINDOW_CLOSED;
795 goto reject;
796 }
797
798 conn = session->leadconn;
98644047
MC		 799 if (!conn) {
800 reason = FAILURE_SESSION_FREED;
801 goto fault;
802 }
7996a778 803
60ecebf5
MC		 804 if (!__kfifo_get(session->cmdpool.queue, (void*)&ctask,
805 sizeof(void*))) {
806 reason = FAILURE_OOM;
807 goto reject;
808 }
7996a778
MC		 809 sc->SCp.phase = session->age;
810 sc->SCp.ptr = (char *)ctask;
811
60ecebf5 812 atomic_set(&ctask->refcount, 1);
b6c395ed 813 ctask->state = ISCSI_TASK_PENDING;
7996a778
MC		 814 ctask->mtask = NULL;
815 ctask->conn = conn;
816 ctask->sc = sc;
817 INIT_LIST_HEAD(&ctask->running);
818 ctask->total_length = sc->request_bufflen;
819 iscsi_prep_scsi_cmd_pdu(ctask);
820
821 session->tt->init_cmd_task(ctask);
822
b6c395ed 823 list_add_tail(&ctask->running, &conn->xmitqueue);
7996a778 824 debug_scsi(
f47f2cf5
MC		 825 "ctask enq [%s cid %d sc %p cdb 0x%x itt 0x%x len %d cmdsn %d "
826 "win %d]\n",
7996a778 827 sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read",
f47f2cf5 828 conn->id, sc, sc->cmnd[0], ctask->itt, sc->request_bufflen,
7996a778
MC		 829 session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1);
830 spin_unlock(&session->lock);
831
832 scsi_queue_work(host, &conn->xmitwork);
833 return 0;
834
835reject:
836 spin_unlock(&session->lock);
837 debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason);
838 return SCSI_MLQUEUE_HOST_BUSY;
839
840fault:
841 spin_unlock(&session->lock);
be2df72e 842 printk(KERN_ERR "iscsi: cmd 0x%x is not queued (%d)\n",
7996a778
MC		 843 sc->cmnd[0], reason);
844 sc->result = (DID_NO_CONNECT << 16);
845 sc->resid = sc->request_bufflen;
846 sc->scsi_done(sc);
847 return 0;
848}
849EXPORT_SYMBOL_GPL(iscsi_queuecommand);
850
851int iscsi_change_queue_depth(struct scsi_device *sdev, int depth)
852{
853 if (depth > ISCSI_MAX_CMD_PER_LUN)
854 depth = ISCSI_MAX_CMD_PER_LUN;
855 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
856 return sdev->queue_depth;
857}
858EXPORT_SYMBOL_GPL(iscsi_change_queue_depth);
859
860static int
861iscsi_conn_send_generic(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
862 char *data, uint32_t data_size)
863{
864 struct iscsi_session *session = conn->session;
865 struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
866 struct iscsi_mgmt_task *mtask;
867
868 spin_lock_bh(&session->lock);
869 if (session->state == ISCSI_STATE_TERMINATE) {
870 spin_unlock_bh(&session->lock);
871 return -EPERM;
872 }
873 if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) ||
874 hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
875 /*
876 * Login and Text are sent serially, in
877 * request-followed-by-response sequence.
878 * Same mtask can be used. Same ITT must be used.
879 * Note that login_mtask is preallocated at conn_create().
880 */
881 mtask = conn->login_mtask;
882 else {
656cffc9
MC		 883 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
884 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
7996a778 885
8d2860b3 886 nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
7996a778
MC		 887 if (!__kfifo_get(session->mgmtpool.queue,
888 (void*)&mtask, sizeof(void*))) {
889 spin_unlock_bh(&session->lock);
890 return -ENOSPC;
891 }
892 }
893
894 /*
8d2860b3 895 * pre-format CmdSN for outgoing PDU.
7996a778 896 */
b4377356
AV		 897 if (hdr->itt != RESERVED_ITT) {
898 hdr->itt = build_itt(mtask->itt, conn->id, session->age);
7996a778
MC		 899 nop->cmdsn = cpu_to_be32(session->cmdsn);
900 if (conn->c_stage == ISCSI_CONN_STARTED &&
901 !(hdr->opcode & ISCSI_OP_IMMEDIATE))
902 session->cmdsn++;
903 } else
904 /* do not advance CmdSN */
905 nop->cmdsn = cpu_to_be32(session->cmdsn);
906
7996a778
MC		 907 if (data_size) {
908 memcpy(mtask->data, data, data_size);
909 mtask->data_count = data_size;
910 } else
911 mtask->data_count = 0;
912
913 INIT_LIST_HEAD(&mtask->running);
914 memcpy(mtask->hdr, hdr, sizeof(struct iscsi_hdr));
915 if (session->tt->init_mgmt_task)
916 session->tt->init_mgmt_task(conn, mtask, data, data_size);
917 spin_unlock_bh(&session->lock);
918
919 debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n",
920 hdr->opcode, hdr->itt, data_size);
921
922 /*
923 * since send_pdu() could be called at least from two contexts,
924 * we need to serialize __kfifo_put, so we don't have to take
925 * additional lock on fast data-path
926 */
927 if (hdr->opcode & ISCSI_OP_IMMEDIATE)
928 __kfifo_put(conn->immqueue, (void*)&mtask, sizeof(void*));
929 else
930 __kfifo_put(conn->mgmtqueue, (void*)&mtask, sizeof(void*));
931
932 scsi_queue_work(session->host, &conn->xmitwork);
933 return 0;
934}
935
936int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr,
937 char *data, uint32_t data_size)
938{
939 struct iscsi_conn *conn = cls_conn->dd_data;
940 int rc;
941
942 mutex_lock(&conn->xmitmutex);
943 rc = iscsi_conn_send_generic(conn, hdr, data, data_size);
944 mutex_unlock(&conn->xmitmutex);
945
946 return rc;
947}
948EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu);
949
950void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
951{
952 struct iscsi_session *session = class_to_transport_session(cls_session);
953 struct iscsi_conn *conn = session->leadconn;
954
955 spin_lock_bh(&session->lock);
956 if (session->state != ISCSI_STATE_LOGGED_IN) {
656cffc9 957 session->state = ISCSI_STATE_RECOVERY_FAILED;
7996a778
MC		 958 if (conn)
959 wake_up(&conn->ehwait);
960 }
961 spin_unlock_bh(&session->lock);
962}
963EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
964
965int iscsi_eh_host_reset(struct scsi_cmnd *sc)
966{
967 struct Scsi_Host *host = sc->device->host;
968 struct iscsi_session *session = iscsi_hostdata(host->hostdata);
969 struct iscsi_conn *conn = session->leadconn;
970 int fail_session = 0;
971
972 spin_lock_bh(&session->lock);
973 if (session->state == ISCSI_STATE_TERMINATE) {
974failed:
975 debug_scsi("failing host reset: session terminated "
d6e24d1c 976 "[CID %d age %d]\n", conn->id, session->age);
7996a778
MC		 977 spin_unlock_bh(&session->lock);
978 return FAILED;
979 }
980
981 if (sc->SCp.phase == session->age) {
d6e24d1c 982 debug_scsi("failing connection CID %d due to SCSI host reset\n",
7996a778
MC		 983 conn->id);
984 fail_session = 1;
985 }
986 spin_unlock_bh(&session->lock);
987
988 /*
989 * we drop the lock here but the leadconn cannot be destoyed while
990 * we are in the scsi eh
991 */
656cffc9 992 if (fail_session)
7996a778 993 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
7996a778
MC		 994
995 debug_scsi("iscsi_eh_host_reset wait for relogin\n");
996 wait_event_interruptible(conn->ehwait,
997 session->state == ISCSI_STATE_TERMINATE ||
998 session->state == ISCSI_STATE_LOGGED_IN ||
656cffc9 999 session->state == ISCSI_STATE_RECOVERY_FAILED);
7996a778
MC		 1000 if (signal_pending(current))
1001 flush_signals(current);
1002
1003 spin_lock_bh(&session->lock);
1004 if (session->state == ISCSI_STATE_LOGGED_IN)
be2df72e 1005 printk(KERN_INFO "iscsi: host reset succeeded\n");
7996a778
MC		 1006 else
1007 goto failed;
1008 spin_unlock_bh(&session->lock);
1009
1010 return SUCCESS;
1011}
1012EXPORT_SYMBOL_GPL(iscsi_eh_host_reset);
1013
1014static void iscsi_tmabort_timedout(unsigned long data)
1015{
1016 struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)data;
1017 struct iscsi_conn *conn = ctask->conn;
1018 struct iscsi_session *session = conn->session;
1019
1020 spin_lock(&session->lock);
1021 if (conn->tmabort_state == TMABORT_INITIAL) {
1022 conn->tmabort_state = TMABORT_TIMEDOUT;
1023 debug_scsi("tmabort timedout [sc %p itt 0x%x]\n",
1024 ctask->sc, ctask->itt);
1025 /* unblock eh_abort() */
1026 wake_up(&conn->ehwait);
1027 }
1028 spin_unlock(&session->lock);
1029}
1030
1031/* must be called with the mutex lock */
1032static int iscsi_exec_abort_task(struct scsi_cmnd *sc,
1033 struct iscsi_cmd_task *ctask)
1034{
1035 struct iscsi_conn *conn = ctask->conn;
1036 struct iscsi_session *session = conn->session;
1037 struct iscsi_tm *hdr = &conn->tmhdr;
1038 int rc;
1039
1040 /*
1041 * ctask timed out but session is OK requests must be serialized.
1042 */
1043 memset(hdr, 0, sizeof(struct iscsi_tm));
1044 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
1045 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK;
1046 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
1047 memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
1048 hdr->rtt = ctask->hdr->itt;
1049 hdr->refcmdsn = ctask->hdr->cmdsn;
1050
1051 rc = iscsi_conn_send_generic(conn, (struct iscsi_hdr *)hdr,
1052 NULL, 0);
1053 if (rc) {
1054 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
d6e24d1c
PW		 1055 debug_scsi("abort sent failure [itt 0x%x] %d\n", ctask->itt,
1056 rc);
7996a778
MC		 1057 return rc;
1058 }
1059
1060 debug_scsi("abort sent [itt 0x%x]\n", ctask->itt);
1061
1062 spin_lock_bh(&session->lock);
1063 ctask->mtask = (struct iscsi_mgmt_task *)
b4377356 1064 session->mgmt_cmds[get_itt(hdr->itt) -
7996a778
MC		 1065 ISCSI_MGMT_ITT_OFFSET];
1066
1067 if (conn->tmabort_state == TMABORT_INITIAL) {
1068 conn->tmfcmd_pdus_cnt++;
1069 conn->tmabort_timer.expires = 10*HZ + jiffies;
1070 conn->tmabort_timer.function = iscsi_tmabort_timedout;
1071 conn->tmabort_timer.data = (unsigned long)ctask;
1072 add_timer(&conn->tmabort_timer);
d6e24d1c 1073 debug_scsi("abort set timeout [itt 0x%x]\n", ctask->itt);
7996a778
MC		 1074 }
1075 spin_unlock_bh(&session->lock);
1076 mutex_unlock(&conn->xmitmutex);
1077
1078 /*
1079 * block eh thread until:
1080 *
1081 * 1) abort response
1082 * 2) abort timeout
1083 * 3) session is terminated or restarted or userspace has
1084 * given up on recovery
1085 */
1086 wait_event_interruptible(conn->ehwait,
1087 sc->SCp.phase != session->age ||
1088 session->state != ISCSI_STATE_LOGGED_IN ||
656cffc9 1089 conn->tmabort_state != TMABORT_INITIAL);
7996a778
MC		 1090 if (signal_pending(current))
1091 flush_signals(current);
1092 del_timer_sync(&conn->tmabort_timer);
1093
1094 mutex_lock(&conn->xmitmutex);
1095 return 0;
1096}
1097
1098/*
1099 * xmit mutex and session lock must be held
1100 */
b6c395ed
MC		 1101static struct iscsi_mgmt_task *
1102iscsi_remove_mgmt_task(struct kfifo *fifo, uint32_t itt)
1103{
1104 int i, nr_tasks = __kfifo_len(fifo) / sizeof(void*);
1105 struct iscsi_mgmt_task *task;
1106
1107 debug_scsi("searching %d tasks\n", nr_tasks);
1108
1109 for (i = 0; i < nr_tasks; i++) {
1110 __kfifo_get(fifo, (void*)&task, sizeof(void*));
1111 debug_scsi("check task %u\n", task->itt);
1112
1113 if (task->itt == itt) {
1114 debug_scsi("matched task\n");
1115 return task;
1116 }
7996a778 1117
b6c395ed
MC		 1118 __kfifo_put(fifo, (void*)&task, sizeof(void*));
1119 }
1120 return NULL;
1121}
7996a778
MC		 1122
1123static int iscsi_ctask_mtask_cleanup(struct iscsi_cmd_task *ctask)
1124{
1125 struct iscsi_conn *conn = ctask->conn;
1126 struct iscsi_session *session = conn->session;
1127
1128 if (!ctask->mtask)
1129 return -EINVAL;
1130
1131 if (!iscsi_remove_mgmt_task(conn->immqueue, ctask->mtask->itt))
1132 list_del(&ctask->mtask->running);
1133 __kfifo_put(session->mgmtpool.queue, (void*)&ctask->mtask,
1134 sizeof(void*));
1135 ctask->mtask = NULL;
1136 return 0;
1137}
1138
1139/*
1140 * session lock and xmitmutex must be held
1141 */
1142static void fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
1143 int err)
1144{
1145 struct scsi_cmnd *sc;
1146
7996a778
MC		 1147 sc = ctask->sc;
1148 if (!sc)
1149 return;
e648f63c
MC		 1150
1151 conn->session->tt->cleanup_cmd_task(conn, ctask);
7ea8b828
MC		 1152 iscsi_ctask_mtask_cleanup(ctask);
1153
7996a778
MC		 1154 sc->result = err;
1155 sc->resid = sc->request_bufflen;
e648f63c 1156 /* release ref from queuecommand */
60ecebf5 1157 __iscsi_put_ctask(ctask);
7996a778
MC		 1158}
1159
1160int iscsi_eh_abort(struct scsi_cmnd *sc)
1161{
f47f2cf5
MC		 1162 struct iscsi_cmd_task *ctask;
1163 struct iscsi_conn *conn;
1164 struct iscsi_session *session;
7996a778
MC		 1165 int rc;
1166
f47f2cf5
MC		 1167 /*
1168 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
1169 * got the command.
1170 */
1171 if (!sc->SCp.ptr) {
1172 debug_scsi("sc never reached iscsi layer or it completed.\n");
1173 return SUCCESS;
1174 }
1175
1176 ctask = (struct iscsi_cmd_task *)sc->SCp.ptr;
1177 conn = ctask->conn;
1178 session = conn->session;
1179
7996a778
MC		 1180 conn->eh_abort_cnt++;
1181 debug_scsi("aborting [sc %p itt 0x%x]\n", sc, ctask->itt);
1182
1183 mutex_lock(&conn->xmitmutex);
1184 spin_lock_bh(&session->lock);
1185
1186 /*
1187 * If we are not logged in or we have started a new session
1188 * then let the host reset code handle this
1189 */
1190 if (session->state != ISCSI_STATE_LOGGED_IN ||
1191 sc->SCp.phase != session->age)
1192 goto failed;
1193
1194 /* ctask completed before time out */
7ea8b828
MC		 1195 if (!ctask->sc) {
1196 spin_unlock_bh(&session->lock);
1197 debug_scsi("sc completed while abort in progress\n");
1198 goto success_rel_mutex;
1199 }
7996a778
MC		 1200
1201 /* what should we do here ? */
1202 if (conn->ctask == ctask) {
be2df72e
OG		 1203 printk(KERN_INFO "iscsi: sc %p itt 0x%x partially sent. "
1204 "Failing abort\n", sc, ctask->itt);
7996a778
MC		 1205 goto failed;
1206 }
1207
b6c395ed 1208 if (ctask->state == ISCSI_TASK_PENDING)
7ea8b828 1209 goto success_cleanup;
7996a778
MC		 1210
1211 conn->tmabort_state = TMABORT_INITIAL;
1212
1213 spin_unlock_bh(&session->lock);
1214 rc = iscsi_exec_abort_task(sc, ctask);
1215 spin_lock_bh(&session->lock);
1216
7996a778
MC		 1217 if (rc || sc->SCp.phase != session->age ||
1218 session->state != ISCSI_STATE_LOGGED_IN)
1219 goto failed;
7ea8b828 1220 iscsi_ctask_mtask_cleanup(ctask);
7996a778 1221
7ea8b828
MC		 1222 switch (conn->tmabort_state) {
1223 case TMABORT_SUCCESS:
1224 goto success_cleanup;
1225 case TMABORT_NOT_FOUND:
1226 if (!ctask->sc) {
1227 /* ctask completed before tmf abort response */
1228 spin_unlock_bh(&session->lock);
1229 debug_scsi("sc completed while abort in progress\n");
1230 goto success_rel_mutex;
1231 }
1232 /* fall through */
1233 default:
1234 /* timedout or failed */
7996a778
MC		 1235 spin_unlock_bh(&session->lock);
1236 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1237 spin_lock_bh(&session->lock);
1238 goto failed;
1239 }
1240
7ea8b828 1241success_cleanup:
7996a778
MC		 1242 debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
1243 spin_unlock_bh(&session->lock);
1244
1245 /*
1246 * clean up task if aborted. we have the xmitmutex so grab
1247 * the recv lock as a writer
1248 */
1249 write_lock_bh(conn->recv_lock);
1250 spin_lock(&session->lock);
1251 fail_command(conn, ctask, DID_ABORT << 16);
1252 spin_unlock(&session->lock);
1253 write_unlock_bh(conn->recv_lock);
1254
7ea8b828 1255success_rel_mutex:
7996a778
MC		 1256 mutex_unlock(&conn->xmitmutex);
1257 return SUCCESS;
1258
1259failed:
1260 spin_unlock_bh(&session->lock);
1261 mutex_unlock(&conn->xmitmutex);
1262
1263 debug_scsi("abort failed [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
1264 return FAILED;
1265}
1266EXPORT_SYMBOL_GPL(iscsi_eh_abort);
1267
1268int
1269iscsi_pool_init(struct iscsi_queue *q, int max, void ***items, int item_size)
1270{
1271 int i;
1272
1273 *items = kmalloc(max * sizeof(void*), GFP_KERNEL);
1274 if (*items == NULL)
1275 return -ENOMEM;
1276
1277 q->max = max;
1278 q->pool = kmalloc(max * sizeof(void*), GFP_KERNEL);
1279 if (q->pool == NULL) {
1280 kfree(*items);
1281 return -ENOMEM;
1282 }
1283
1284 q->queue = kfifo_init((void*)q->pool, max * sizeof(void*),
1285 GFP_KERNEL, NULL);
1286 if (q->queue == ERR_PTR(-ENOMEM)) {
1287 kfree(q->pool);
1288 kfree(*items);
1289 return -ENOMEM;
1290 }
1291
1292 for (i = 0; i < max; i++) {
1293 q->pool[i] = kmalloc(item_size, GFP_KERNEL);
1294 if (q->pool[i] == NULL) {
1295 int j;
1296
1297 for (j = 0; j < i; j++)
1298 kfree(q->pool[j]);
1299
1300 kfifo_free(q->queue);
1301 kfree(q->pool);
1302 kfree(*items);
1303 return -ENOMEM;
1304 }
1305 memset(q->pool[i], 0, item_size);
1306 (*items)[i] = q->pool[i];
1307 __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*));
1308 }
1309 return 0;
1310}
1311EXPORT_SYMBOL_GPL(iscsi_pool_init);
1312
1313void iscsi_pool_free(struct iscsi_queue *q, void **items)
1314{
1315 int i;
1316
1317 for (i = 0; i < q->max; i++)
1318 kfree(items[i]);
1319 kfree(q->pool);
1320 kfree(items);
1321}
1322EXPORT_SYMBOL_GPL(iscsi_pool_free);
1323
1324/*
1325 * iSCSI Session's hostdata organization:
1326 *
1327 * *------------------* <== hostdata_session(host->hostdata)
1328 * | ptr to class sess|
1329 * |------------------| <== iscsi_hostdata(host->hostdata)
1330 * | iscsi_session |
1331 * *------------------*
1332 */
1333
1334#define hostdata_privsize(_sz) (sizeof(unsigned long) + _sz + \
1335 _sz % sizeof(unsigned long))
1336
1337#define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata))
1338
1339/**
1340 * iscsi_session_setup - create iscsi cls session and host and session
1341 * @scsit: scsi transport template
1342 * @iscsit: iscsi transport template
1343 * @initial_cmdsn: initial CmdSN
1344 * @hostno: host no allocated
1345 *
1346 * This can be used by software iscsi_transports that allocate
1347 * a session per scsi host.
1348 **/
1349struct iscsi_cls_session *
1350iscsi_session_setup(struct iscsi_transport *iscsit,
1351 struct scsi_transport_template *scsit,
1352 int cmd_task_size, int mgmt_task_size,
1353 uint32_t initial_cmdsn, uint32_t *hostno)
1354{
1355 struct Scsi_Host *shost;
1356 struct iscsi_session *session;
1357 struct iscsi_cls_session *cls_session;
1358 int cmd_i;
1359
1360 shost = scsi_host_alloc(iscsit->host_template,
1361 hostdata_privsize(sizeof(*session)));
1362 if (!shost)
1363 return NULL;
1364
1365 shost->max_id = 1;
1366 shost->max_channel = 0;
1367 shost->max_lun = iscsit->max_lun;
1368 shost->max_cmd_len = iscsit->max_cmd_len;
1369 shost->transportt = scsit;
1370 shost->transportt->create_work_queue = 1;
1371 *hostno = shost->host_no;
1372
1373 session = iscsi_hostdata(shost->hostdata);
1374 memset(session, 0, sizeof(struct iscsi_session));
1375 session->host = shost;
1376 session->state = ISCSI_STATE_FREE;
1377 session->mgmtpool_max = ISCSI_MGMT_CMDS_MAX;
1378 session->cmds_max = ISCSI_XMIT_CMDS_MAX;
1379 session->cmdsn = initial_cmdsn;
1380 session->exp_cmdsn = initial_cmdsn + 1;
1381 session->max_cmdsn = initial_cmdsn + 1;
1382 session->max_r2t = 1;
1383 session->tt = iscsit;
1384
1385 /* initialize SCSI PDU commands pool */
1386 if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
1387 (void***)&session->cmds,
1388 cmd_task_size + sizeof(struct iscsi_cmd_task)))
1389 goto cmdpool_alloc_fail;
1390
1391 /* pre-format cmds pool with ITT */
1392 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
1393 struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
1394
1395 if (cmd_task_size)
1396 ctask->dd_data = &ctask[1];
1397 ctask->itt = cmd_i;
b6c395ed 1398 INIT_LIST_HEAD(&ctask->running);
7996a778
MC		 1399 }
1400
1401 spin_lock_init(&session->lock);
7996a778
MC		 1402
1403 /* initialize immediate command pool */
1404 if (iscsi_pool_init(&session->mgmtpool, session->mgmtpool_max,
1405 (void***)&session->mgmt_cmds,
1406 mgmt_task_size + sizeof(struct iscsi_mgmt_task)))
1407 goto mgmtpool_alloc_fail;
1408
1409
1410 /* pre-format immediate cmds pool with ITT */
1411 for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) {
1412 struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i];
1413
1414 if (mgmt_task_size)
1415 mtask->dd_data = &mtask[1];
1416 mtask->itt = ISCSI_MGMT_ITT_OFFSET + cmd_i;
b6c395ed 1417 INIT_LIST_HEAD(&mtask->running);
7996a778
MC		 1418 }
1419
1420 if (scsi_add_host(shost, NULL))
1421 goto add_host_fail;
1422
f53a88da
MC		 1423 if (!try_module_get(iscsit->owner))
1424 goto cls_session_fail;
1425
6a8a0d36 1426 cls_session = iscsi_create_session(shost, iscsit, 0);
7996a778 1427 if (!cls_session)
f53a88da 1428 goto module_put;
7996a778
MC		 1429 *(unsigned long*)shost->hostdata = (unsigned long)cls_session;
1430
1431 return cls_session;
1432
f53a88da
MC		 1433module_put:
1434 module_put(iscsit->owner);
7996a778
MC		 1435cls_session_fail:
1436 scsi_remove_host(shost);
1437add_host_fail:
7996a778
MC		 1438 iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
1439mgmtpool_alloc_fail:
1440 iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
1441cmdpool_alloc_fail:
1442 scsi_host_put(shost);
1443 return NULL;
1444}
1445EXPORT_SYMBOL_GPL(iscsi_session_setup);
1446
1447/**
1448 * iscsi_session_teardown - destroy session, host, and cls_session
1449 * shost: scsi host
1450 *
1451 * This can be used by software iscsi_transports that allocate
1452 * a session per scsi host.
1453 **/
1454void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
1455{
1456 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
1457 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
63f75cc8 1458 struct module *owner = cls_session->transport->owner;
7996a778
MC		 1459
1460 scsi_remove_host(shost);
1461
7996a778
MC		 1462 iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
1463 iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
1464
f3ff0c36 1465 kfree(session->targetname);
0801c242 1466 kfree(session->hwaddress);
8ad5781a 1467 kfree(session->initiatorname);
f3ff0c36 1468
7996a778
MC		 1469 iscsi_destroy_session(cls_session);
1470 scsi_host_put(shost);
63f75cc8 1471 module_put(owner);
7996a778
MC		 1472}
1473EXPORT_SYMBOL_GPL(iscsi_session_teardown);
1474
1475/**
1476 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
1477 * @cls_session: iscsi_cls_session
1478 * @conn_idx: cid
1479 **/
1480struct iscsi_cls_conn *
1481iscsi_conn_setup(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
1482{
1483 struct iscsi_session *session = class_to_transport_session(cls_session);
1484 struct iscsi_conn *conn;
1485 struct iscsi_cls_conn *cls_conn;
d36ab6f3 1486 char *data;
7996a778
MC		 1487
1488 cls_conn = iscsi_create_conn(cls_session, conn_idx);
1489 if (!cls_conn)
1490 return NULL;
1491 conn = cls_conn->dd_data;
1492 memset(conn, 0, sizeof(*conn));
1493
1494 conn->session = session;
1495 conn->cls_conn = cls_conn;
1496 conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
1497 conn->id = conn_idx;
1498 conn->exp_statsn = 0;
1499 conn->tmabort_state = TMABORT_INITIAL;
1500 INIT_LIST_HEAD(&conn->run_list);
1501 INIT_LIST_HEAD(&conn->mgmt_run_list);
b6c395ed 1502 INIT_LIST_HEAD(&conn->xmitqueue);
7996a778
MC		 1503
1504 /* initialize general immediate & non-immediate PDU commands queue */
1505 conn->immqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*),
1506 GFP_KERNEL, NULL);
1507 if (conn->immqueue == ERR_PTR(-ENOMEM))
1508 goto immqueue_alloc_fail;
1509
1510 conn->mgmtqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*),
1511 GFP_KERNEL, NULL);
1512 if (conn->mgmtqueue == ERR_PTR(-ENOMEM))
1513 goto mgmtqueue_alloc_fail;
1514
c4028958 1515 INIT_WORK(&conn->xmitwork, iscsi_xmitworker);
7996a778
MC		 1516
1517 /* allocate login_mtask used for the login/text sequences */
1518 spin_lock_bh(&session->lock);
1519 if (!__kfifo_get(session->mgmtpool.queue,
1520 (void*)&conn->login_mtask,
1521 sizeof(void*))) {
1522 spin_unlock_bh(&session->lock);
1523 goto login_mtask_alloc_fail;
1524 }
1525 spin_unlock_bh(&session->lock);
1526
bf32ed33 1527 data = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN, GFP_KERNEL);
d36ab6f3
MC		 1528 if (!data)
1529 goto login_mtask_data_alloc_fail;
c8dc1e52 1530 conn->login_mtask->data = conn->data = data;
d36ab6f3 1531
7996a778
MC		 1532 init_timer(&conn->tmabort_timer);
1533 mutex_init(&conn->xmitmutex);
1534 init_waitqueue_head(&conn->ehwait);
1535
1536 return cls_conn;
1537
d36ab6f3
MC		 1538login_mtask_data_alloc_fail:
1539 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
1540 sizeof(void*));
7996a778
MC		 1541login_mtask_alloc_fail:
1542 kfifo_free(conn->mgmtqueue);
1543mgmtqueue_alloc_fail:
1544 kfifo_free(conn->immqueue);
1545immqueue_alloc_fail:
7996a778
MC		 1546 iscsi_destroy_conn(cls_conn);
1547 return NULL;
1548}
1549EXPORT_SYMBOL_GPL(iscsi_conn_setup);
1550
1551/**
1552 * iscsi_conn_teardown - teardown iscsi connection
1553 * cls_conn: iscsi class connection
1554 *
1555 * TODO: we may need to make this into a two step process
1556 * like scsi-mls remove + put host
1557 */
1558void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
1559{
1560 struct iscsi_conn *conn = cls_conn->dd_data;
1561 struct iscsi_session *session = conn->session;
1562 unsigned long flags;
1563
7996a778 1564 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
67a61114 1565 mutex_lock(&conn->xmitmutex);
7996a778
MC		 1566
1567 spin_lock_bh(&session->lock);
1568 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
1569 if (session->leadconn == conn) {
1570 /*
1571 * leading connection? then give up on recovery.
1572 */
1573 session->state = ISCSI_STATE_TERMINATE;
1574 wake_up(&conn->ehwait);
1575 }
1576 spin_unlock_bh(&session->lock);
1577
1578 mutex_unlock(&conn->xmitmutex);
1579
1580 /*
1581 * Block until all in-progress commands for this connection
1582 * time out or fail.
1583 */
1584 for (;;) {
1585 spin_lock_irqsave(session->host->host_lock, flags);
1586 if (!session->host->host_busy) { /* OK for ERL == 0 */
1587 spin_unlock_irqrestore(session->host->host_lock, flags);
1588 break;
1589 }
1590 spin_unlock_irqrestore(session->host->host_lock, flags);
1591 msleep_interruptible(500);
be2df72e
OG		 1592 printk(KERN_INFO "iscsi: scsi conn_destroy(): host_busy %d "
1593 "host_failed %d\n", session->host->host_busy,
1594 session->host->host_failed);
7996a778
MC		 1595 /*
1596 * force eh_abort() to unblock
1597 */
1598 wake_up(&conn->ehwait);
1599 }
1600
779ea120
MC		 1601 /* flush queued up work because we free the connection below */
1602 scsi_flush_work(session->host);
1603
7996a778 1604 spin_lock_bh(&session->lock);
c8dc1e52 1605 kfree(conn->data);
f3ff0c36 1606 kfree(conn->persistent_address);
7996a778
MC		 1607 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
1608 sizeof(void*));
98644047 1609 if (session->leadconn == conn) {
7996a778 1610 session->leadconn = NULL;
7996a778
MC		 1611 /* no connections exits.. reset sequencing */
1612 session->cmdsn = session->max_cmdsn = session->exp_cmdsn = 1;
98644047 1613 }
7996a778
MC		 1614 spin_unlock_bh(&session->lock);
1615
7996a778
MC		 1616 kfifo_free(conn->immqueue);
1617 kfifo_free(conn->mgmtqueue);
1618
1619 iscsi_destroy_conn(cls_conn);
1620}
1621EXPORT_SYMBOL_GPL(iscsi_conn_teardown);
1622
1623int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
1624{
1625 struct iscsi_conn *conn = cls_conn->dd_data;
1626 struct iscsi_session *session = conn->session;
1627
ffd0436e 1628 if (!session) {
7996a778
MC		 1629 printk(KERN_ERR "iscsi: can't start unbound connection\n");
1630 return -EPERM;
1631 }
1632
db98ccde
MC		 1633 if ((session->imm_data_en || !session->initial_r2t_en) &&
1634 session->first_burst > session->max_burst) {
ffd0436e
MC		 1635 printk("iscsi: invalid burst lengths: "
1636 "first_burst %d max_burst %d\n",
1637 session->first_burst, session->max_burst);
1638 return -EINVAL;
1639 }
1640
7996a778
MC		 1641 spin_lock_bh(&session->lock);
1642 conn->c_stage = ISCSI_CONN_STARTED;
1643 session->state = ISCSI_STATE_LOGGED_IN;
1644
1645 switch(conn->stop_stage) {
1646 case STOP_CONN_RECOVER:
1647 /*
1648 * unblock eh_abort() if it is blocked. re-try all
1649 * commands after successful recovery
1650 */
7996a778
MC		 1651 conn->stop_stage = 0;
1652 conn->tmabort_state = TMABORT_INITIAL;
1653 session->age++;
7996a778
MC		 1654 spin_unlock_bh(&session->lock);
1655
1656 iscsi_unblock_session(session_to_cls(session));
1657 wake_up(&conn->ehwait);
1658 return 0;
1659 case STOP_CONN_TERM:
7996a778 1660 conn->stop_stage = 0;
7996a778
MC		 1661 break;
1662 default:
1663 break;
1664 }
1665 spin_unlock_bh(&session->lock);
1666
1667 return 0;
1668}
1669EXPORT_SYMBOL_GPL(iscsi_conn_start);
1670
1671static void
1672flush_control_queues(struct iscsi_session *session, struct iscsi_conn *conn)
1673{
1674 struct iscsi_mgmt_task *mtask, *tmp;
1675
1676 /* handle pending */
1677 while (__kfifo_get(conn->immqueue, (void*)&mtask, sizeof(void*)) ||
1678 __kfifo_get(conn->mgmtqueue, (void*)&mtask, sizeof(void*))) {
1679 if (mtask == conn->login_mtask)
1680 continue;
1681 debug_scsi("flushing pending mgmt task itt 0x%x\n", mtask->itt);
1682 __kfifo_put(session->mgmtpool.queue, (void*)&mtask,
1683 sizeof(void*));
1684 }
1685
1686 /* handle running */
1687 list_for_each_entry_safe(mtask, tmp, &conn->mgmt_run_list, running) {
1688 debug_scsi("flushing running mgmt task itt 0x%x\n", mtask->itt);
ed2abc7f
MC		 1689 list_del(&mtask->running);
1690
7996a778
MC		 1691 if (mtask == conn->login_mtask)
1692 continue;
ed2abc7f 1693 __kfifo_put(session->mgmtpool.queue, (void*)&mtask,
7996a778
MC		 1694 sizeof(void*));
1695 }
1696
1697 conn->mtask = NULL;
1698}
1699
1700/* Fail commands. Mutex and session lock held and recv side suspended */
1701static void fail_all_commands(struct iscsi_conn *conn)
1702{
1703 struct iscsi_cmd_task *ctask, *tmp;
1704
1705 /* flush pending */
b6c395ed 1706 list_for_each_entry_safe(ctask, tmp, &conn->xmitqueue, running) {
7996a778
MC		 1707 debug_scsi("failing pending sc %p itt 0x%x\n", ctask->sc,
1708 ctask->itt);
1709 fail_command(conn, ctask, DID_BUS_BUSY << 16);
1710 }
1711
1712 /* fail all other running */
1713 list_for_each_entry_safe(ctask, tmp, &conn->run_list, running) {
1714 debug_scsi("failing in progress sc %p itt 0x%x\n",
1715 ctask->sc, ctask->itt);
1716 fail_command(conn, ctask, DID_BUS_BUSY << 16);
1717 }
1718
1719 conn->ctask = NULL;
1720}
1721
656cffc9
MC		 1722static void iscsi_start_session_recovery(struct iscsi_session *session,
1723 struct iscsi_conn *conn, int flag)
7996a778 1724{
ed2abc7f
MC		 1725 int old_stop_stage;
1726
7996a778 1727 spin_lock_bh(&session->lock);
ed2abc7f 1728 if (conn->stop_stage == STOP_CONN_TERM) {
7996a778
MC		 1729 spin_unlock_bh(&session->lock);
1730 return;
1731 }
ed2abc7f
MC		 1732
1733 /*
1734 * When this is called for the in_login state, we only want to clean
67a61114
MC		 1735 * up the login task and connection. We do not need to block and set
1736 * the recovery state again
ed2abc7f 1737 */
67a61114
MC		 1738 if (flag == STOP_CONN_TERM)
1739 session->state = ISCSI_STATE_TERMINATE;
1740 else if (conn->stop_stage != STOP_CONN_RECOVER)
1741 session->state = ISCSI_STATE_IN_RECOVERY;
ed2abc7f
MC		 1742
1743 old_stop_stage = conn->stop_stage;
7996a778 1744 conn->stop_stage = flag;
67a61114
MC		 1745 conn->c_stage = ISCSI_CONN_STOPPED;
1746 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
7996a778
MC		 1747 spin_unlock_bh(&session->lock);
1748
1c83469d
MC		 1749 write_lock_bh(conn->recv_lock);
1750 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
1751 write_unlock_bh(conn->recv_lock);
7996a778
MC		 1752
1753 mutex_lock(&conn->xmitmutex);
7996a778
MC		 1754 /*
1755 * for connection level recovery we should not calculate
1756 * header digest. conn->hdr_size used for optimization
1757 * in hdr_extract() and will be re-negotiated at
1758 * set_param() time.
1759 */
1760 if (flag == STOP_CONN_RECOVER) {
1761 conn->hdrdgst_en = 0;
1762 conn->datadgst_en = 0;
656cffc9 1763 if (session->state == ISCSI_STATE_IN_RECOVERY &&
67a61114
MC		 1764 old_stop_stage != STOP_CONN_RECOVER) {
1765 debug_scsi("blocking session\n");
7996a778 1766 iscsi_block_session(session_to_cls(session));
67a61114 1767 }
7996a778 1768 }
656cffc9 1769
656cffc9
MC		 1770 /*
1771 * flush queues.
1772 */
1773 spin_lock_bh(&session->lock);
1774 fail_all_commands(conn);
1775 flush_control_queues(session, conn);
1776 spin_unlock_bh(&session->lock);
1777
7996a778
MC		 1778 mutex_unlock(&conn->xmitmutex);
1779}
7996a778
MC		 1780
1781void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
1782{
1783 struct iscsi_conn *conn = cls_conn->dd_data;
1784 struct iscsi_session *session = conn->session;
1785
1786 switch (flag) {
1787 case STOP_CONN_RECOVER:
1788 case STOP_CONN_TERM:
1789 iscsi_start_session_recovery(session, conn, flag);
8d2860b3 1790 break;
7996a778 1791 default:
be2df72e 1792 printk(KERN_ERR "iscsi: invalid stop flag %d\n", flag);
7996a778
MC		 1793 }
1794}
1795EXPORT_SYMBOL_GPL(iscsi_conn_stop);
1796
1797int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
1798 struct iscsi_cls_conn *cls_conn, int is_leading)
1799{
1800 struct iscsi_session *session = class_to_transport_session(cls_session);
98644047 1801 struct iscsi_conn *conn = cls_conn->dd_data;
7996a778 1802
7996a778 1803 spin_lock_bh(&session->lock);
7996a778
MC		 1804 if (is_leading)
1805 session->leadconn = conn;
98644047 1806 spin_unlock_bh(&session->lock);
7996a778
MC		 1807
1808 /*
1809 * Unblock xmitworker(), Login Phase will pass through.
1810 */
1811 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
1812 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1813 return 0;
1814}
1815EXPORT_SYMBOL_GPL(iscsi_conn_bind);
1816
a54a52ca
MC		 1817
1818int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
1819 enum iscsi_param param, char *buf, int buflen)
1820{
1821 struct iscsi_conn *conn = cls_conn->dd_data;
1822 struct iscsi_session *session = conn->session;
1823 uint32_t value;
1824
1825 switch(param) {
1826 case ISCSI_PARAM_MAX_RECV_DLENGTH:
1827 sscanf(buf, "%d", &conn->max_recv_dlength);
1828 break;
1829 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
1830 sscanf(buf, "%d", &conn->max_xmit_dlength);
1831 break;
1832 case ISCSI_PARAM_HDRDGST_EN:
1833 sscanf(buf, "%d", &conn->hdrdgst_en);
1834 break;
1835 case ISCSI_PARAM_DATADGST_EN:
1836 sscanf(buf, "%d", &conn->datadgst_en);
1837 break;
1838 case ISCSI_PARAM_INITIAL_R2T_EN:
1839 sscanf(buf, "%d", &session->initial_r2t_en);
1840 break;
1841 case ISCSI_PARAM_MAX_R2T:
1842 sscanf(buf, "%d", &session->max_r2t);
1843 break;
1844 case ISCSI_PARAM_IMM_DATA_EN:
1845 sscanf(buf, "%d", &session->imm_data_en);
1846 break;
1847 case ISCSI_PARAM_FIRST_BURST:
1848 sscanf(buf, "%d", &session->first_burst);
1849 break;
1850 case ISCSI_PARAM_MAX_BURST:
1851 sscanf(buf, "%d", &session->max_burst);
1852 break;
1853 case ISCSI_PARAM_PDU_INORDER_EN:
1854 sscanf(buf, "%d", &session->pdu_inorder_en);
1855 break;
1856 case ISCSI_PARAM_DATASEQ_INORDER_EN:
1857 sscanf(buf, "%d", &session->dataseq_inorder_en);
1858 break;
1859 case ISCSI_PARAM_ERL:
1860 sscanf(buf, "%d", &session->erl);
1861 break;
1862 case ISCSI_PARAM_IFMARKER_EN:
1863 sscanf(buf, "%d", &value);
1864 BUG_ON(value);
1865 break;
1866 case ISCSI_PARAM_OFMARKER_EN:
1867 sscanf(buf, "%d", &value);
1868 BUG_ON(value);
1869 break;
1870 case ISCSI_PARAM_EXP_STATSN:
1871 sscanf(buf, "%u", &conn->exp_statsn);
1872 break;
1873 case ISCSI_PARAM_TARGET_NAME:
1874 /* this should not change between logins */
1875 if (session->targetname)
1876 break;
1877
1878 session->targetname = kstrdup(buf, GFP_KERNEL);
1879 if (!session->targetname)
1880 return -ENOMEM;
1881 break;
1882 case ISCSI_PARAM_TPGT:
1883 sscanf(buf, "%d", &session->tpgt);
1884 break;
1885 case ISCSI_PARAM_PERSISTENT_PORT:
1886 sscanf(buf, "%d", &conn->persistent_port);
1887 break;
1888 case ISCSI_PARAM_PERSISTENT_ADDRESS:
1889 /*
1890 * this is the address returned in discovery so it should
1891 * not change between logins.
1892 */
1893 if (conn->persistent_address)
1894 break;
1895
1896 conn->persistent_address = kstrdup(buf, GFP_KERNEL);
1897 if (!conn->persistent_address)
1898 return -ENOMEM;
1899 break;
1900 default:
1901 return -ENOSYS;
1902 }
1903
1904 return 0;
1905}
1906EXPORT_SYMBOL_GPL(iscsi_set_param);
1907
1908int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
1909 enum iscsi_param param, char *buf)
1910{
1911 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
1912 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
1913 int len;
1914
1915 switch(param) {
1916 case ISCSI_PARAM_INITIAL_R2T_EN:
1917 len = sprintf(buf, "%d\n", session->initial_r2t_en);
1918 break;
1919 case ISCSI_PARAM_MAX_R2T:
1920 len = sprintf(buf, "%hu\n", session->max_r2t);
1921 break;
1922 case ISCSI_PARAM_IMM_DATA_EN:
1923 len = sprintf(buf, "%d\n", session->imm_data_en);
1924 break;
1925 case ISCSI_PARAM_FIRST_BURST:
1926 len = sprintf(buf, "%u\n", session->first_burst);
1927 break;
1928 case ISCSI_PARAM_MAX_BURST:
1929 len = sprintf(buf, "%u\n", session->max_burst);
1930 break;
1931 case ISCSI_PARAM_PDU_INORDER_EN:
1932 len = sprintf(buf, "%d\n", session->pdu_inorder_en);
1933 break;
1934 case ISCSI_PARAM_DATASEQ_INORDER_EN:
1935 len = sprintf(buf, "%d\n", session->dataseq_inorder_en);
1936 break;
1937 case ISCSI_PARAM_ERL:
1938 len = sprintf(buf, "%d\n", session->erl);
1939 break;
1940 case ISCSI_PARAM_TARGET_NAME:
1941 len = sprintf(buf, "%s\n", session->targetname);
1942 break;
1943 case ISCSI_PARAM_TPGT:
1944 len = sprintf(buf, "%d\n", session->tpgt);
1945 break;
1946 default:
1947 return -ENOSYS;
1948 }
1949
1950 return len;
1951}
1952EXPORT_SYMBOL_GPL(iscsi_session_get_param);
1953
1954int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
1955 enum iscsi_param param, char *buf)
1956{
1957 struct iscsi_conn *conn = cls_conn->dd_data;
1958 int len;
1959
1960 switch(param) {
1961 case ISCSI_PARAM_MAX_RECV_DLENGTH:
1962 len = sprintf(buf, "%u\n", conn->max_recv_dlength);
1963 break;
1964 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
1965 len = sprintf(buf, "%u\n", conn->max_xmit_dlength);
1966 break;
1967 case ISCSI_PARAM_HDRDGST_EN:
1968 len = sprintf(buf, "%d\n", conn->hdrdgst_en);
1969 break;
1970 case ISCSI_PARAM_DATADGST_EN:
1971 len = sprintf(buf, "%d\n", conn->datadgst_en);
1972 break;
1973 case ISCSI_PARAM_IFMARKER_EN:
1974 len = sprintf(buf, "%d\n", conn->ifmarker_en);
1975 break;
1976 case ISCSI_PARAM_OFMARKER_EN:
1977 len = sprintf(buf, "%d\n", conn->ofmarker_en);
1978 break;
1979 case ISCSI_PARAM_EXP_STATSN:
1980 len = sprintf(buf, "%u\n", conn->exp_statsn);
1981 break;
1982 case ISCSI_PARAM_PERSISTENT_PORT:
1983 len = sprintf(buf, "%d\n", conn->persistent_port);
1984 break;
1985 case ISCSI_PARAM_PERSISTENT_ADDRESS:
1986 len = sprintf(buf, "%s\n", conn->persistent_address);
1987 break;
1988 default:
1989 return -ENOSYS;
1990 }
1991
1992 return len;
1993}
1994EXPORT_SYMBOL_GPL(iscsi_conn_get_param);
1995
0801c242
MC		 1996int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param,
1997 char *buf)
1998{
1999 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
2000 int len;
2001
2002 switch (param) {
2003 case ISCSI_HOST_PARAM_HWADDRESS:
2004 if (!session->hwaddress)
2005 len = sprintf(buf, "%s\n", "default");
2006 else
2007 len = sprintf(buf, "%s\n", session->hwaddress);
2008 break;
8ad5781a
MC		 2009 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2010 if (!session->initiatorname)
2011 len = sprintf(buf, "%s\n", "unknown");
2012 else
2013 len = sprintf(buf, "%s\n", session->initiatorname);
2014 break;
2015
0801c242
MC		 2016 default:
2017 return -ENOSYS;
2018 }
2019
2020 return len;
2021}
2022EXPORT_SYMBOL_GPL(iscsi_host_get_param);
2023
2024int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2025 char *buf, int buflen)
2026{
2027 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
2028
2029 switch (param) {
2030 case ISCSI_HOST_PARAM_HWADDRESS:
2031 if (!session->hwaddress)
2032 session->hwaddress = kstrdup(buf, GFP_KERNEL);
2033 break;
8ad5781a
MC		 2034 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2035 if (!session->initiatorname)
2036 session->initiatorname = kstrdup(buf, GFP_KERNEL);
2037 break;
0801c242
MC		 2038 default:
2039 return -ENOSYS;
2040 }
2041
2042 return 0;
2043}
2044EXPORT_SYMBOL_GPL(iscsi_host_set_param);
2045
7996a778
MC		 2046MODULE_AUTHOR("Mike Christie");
2047MODULE_DESCRIPTION("iSCSI library functions");
2048MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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