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[SCSI] iscsi: Some fixes in preparation for bidirectional support - total_length
[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) {
857ae0bd 150 if (sc->request_bufflen >= session->first_burst)
7996a778
MC		 151 ctask->imm_count = min(session->first_burst,
152 conn->max_xmit_dlength);
153 else
857ae0bd 154 ctask->imm_count = min(sc->request_bufflen,
7996a778
MC		 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) {
857ae0bd
MC		 161 ctask->unsol_count = min((session->first_burst),
162 (sc->request_bufflen)) - 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);
7996a778
MC		 818 iscsi_prep_scsi_cmd_pdu(ctask);
819
820 session->tt->init_cmd_task(ctask);
821
b6c395ed 822 list_add_tail(&ctask->running, &conn->xmitqueue);
7996a778 823 debug_scsi(
f47f2cf5
MC		 824 "ctask enq [%s cid %d sc %p cdb 0x%x itt 0x%x len %d cmdsn %d "
825 "win %d]\n",
7996a778 826 sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read",
f47f2cf5 827 conn->id, sc, sc->cmnd[0], ctask->itt, sc->request_bufflen,
7996a778
MC		 828 session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1);
829 spin_unlock(&session->lock);
830
831 scsi_queue_work(host, &conn->xmitwork);
832 return 0;
833
834reject:
835 spin_unlock(&session->lock);
836 debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason);
837 return SCSI_MLQUEUE_HOST_BUSY;
838
839fault:
840 spin_unlock(&session->lock);
be2df72e 841 printk(KERN_ERR "iscsi: cmd 0x%x is not queued (%d)\n",
7996a778
MC		 842 sc->cmnd[0], reason);
843 sc->result = (DID_NO_CONNECT << 16);
844 sc->resid = sc->request_bufflen;
845 sc->scsi_done(sc);
846 return 0;
847}
848EXPORT_SYMBOL_GPL(iscsi_queuecommand);
849
850int iscsi_change_queue_depth(struct scsi_device *sdev, int depth)
851{
852 if (depth > ISCSI_MAX_CMD_PER_LUN)
853 depth = ISCSI_MAX_CMD_PER_LUN;
854 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
855 return sdev->queue_depth;
856}
857EXPORT_SYMBOL_GPL(iscsi_change_queue_depth);
858
859static int
860iscsi_conn_send_generic(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
861 char *data, uint32_t data_size)
862{
863 struct iscsi_session *session = conn->session;
864 struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
865 struct iscsi_mgmt_task *mtask;
866
867 spin_lock_bh(&session->lock);
868 if (session->state == ISCSI_STATE_TERMINATE) {
869 spin_unlock_bh(&session->lock);
870 return -EPERM;
871 }
872 if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) ||
873 hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
874 /*
875 * Login and Text are sent serially, in
876 * request-followed-by-response sequence.
877 * Same mtask can be used. Same ITT must be used.
878 * Note that login_mtask is preallocated at conn_create().
879 */
880 mtask = conn->login_mtask;
881 else {
656cffc9
MC		 882 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
883 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
7996a778 884
8d2860b3 885 nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
7996a778
MC		 886 if (!__kfifo_get(session->mgmtpool.queue,
887 (void*)&mtask, sizeof(void*))) {
888 spin_unlock_bh(&session->lock);
889 return -ENOSPC;
890 }
891 }
892
893 /*
8d2860b3 894 * pre-format CmdSN for outgoing PDU.
7996a778 895 */
b4377356
AV		 896 if (hdr->itt != RESERVED_ITT) {
897 hdr->itt = build_itt(mtask->itt, conn->id, session->age);
7996a778
MC		 898 nop->cmdsn = cpu_to_be32(session->cmdsn);
899 if (conn->c_stage == ISCSI_CONN_STARTED &&
900 !(hdr->opcode & ISCSI_OP_IMMEDIATE))
901 session->cmdsn++;
902 } else
903 /* do not advance CmdSN */
904 nop->cmdsn = cpu_to_be32(session->cmdsn);
905
7996a778
MC		 906 if (data_size) {
907 memcpy(mtask->data, data, data_size);
908 mtask->data_count = data_size;
909 } else
910 mtask->data_count = 0;
911
912 INIT_LIST_HEAD(&mtask->running);
913 memcpy(mtask->hdr, hdr, sizeof(struct iscsi_hdr));
914 if (session->tt->init_mgmt_task)
915 session->tt->init_mgmt_task(conn, mtask, data, data_size);
916 spin_unlock_bh(&session->lock);
917
918 debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n",
919 hdr->opcode, hdr->itt, data_size);
920
921 /*
922 * since send_pdu() could be called at least from two contexts,
923 * we need to serialize __kfifo_put, so we don't have to take
924 * additional lock on fast data-path
925 */
926 if (hdr->opcode & ISCSI_OP_IMMEDIATE)
927 __kfifo_put(conn->immqueue, (void*)&mtask, sizeof(void*));
928 else
929 __kfifo_put(conn->mgmtqueue, (void*)&mtask, sizeof(void*));
930
931 scsi_queue_work(session->host, &conn->xmitwork);
932 return 0;
933}
934
935int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr,
936 char *data, uint32_t data_size)
937{
938 struct iscsi_conn *conn = cls_conn->dd_data;
939 int rc;
940
941 mutex_lock(&conn->xmitmutex);
942 rc = iscsi_conn_send_generic(conn, hdr, data, data_size);
943 mutex_unlock(&conn->xmitmutex);
944
945 return rc;
946}
947EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu);
948
949void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
950{
951 struct iscsi_session *session = class_to_transport_session(cls_session);
952 struct iscsi_conn *conn = session->leadconn;
953
954 spin_lock_bh(&session->lock);
955 if (session->state != ISCSI_STATE_LOGGED_IN) {
656cffc9 956 session->state = ISCSI_STATE_RECOVERY_FAILED;
7996a778
MC		 957 if (conn)
958 wake_up(&conn->ehwait);
959 }
960 spin_unlock_bh(&session->lock);
961}
962EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
963
964int iscsi_eh_host_reset(struct scsi_cmnd *sc)
965{
966 struct Scsi_Host *host = sc->device->host;
967 struct iscsi_session *session = iscsi_hostdata(host->hostdata);
968 struct iscsi_conn *conn = session->leadconn;
969 int fail_session = 0;
970
971 spin_lock_bh(&session->lock);
972 if (session->state == ISCSI_STATE_TERMINATE) {
973failed:
974 debug_scsi("failing host reset: session terminated "
d6e24d1c 975 "[CID %d age %d]\n", conn->id, session->age);
7996a778
MC		 976 spin_unlock_bh(&session->lock);
977 return FAILED;
978 }
979
980 if (sc->SCp.phase == session->age) {
d6e24d1c 981 debug_scsi("failing connection CID %d due to SCSI host reset\n",
7996a778
MC		 982 conn->id);
983 fail_session = 1;
984 }
985 spin_unlock_bh(&session->lock);
986
987 /*
988 * we drop the lock here but the leadconn cannot be destoyed while
989 * we are in the scsi eh
990 */
656cffc9 991 if (fail_session)
7996a778 992 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
7996a778
MC		 993
994 debug_scsi("iscsi_eh_host_reset wait for relogin\n");
995 wait_event_interruptible(conn->ehwait,
996 session->state == ISCSI_STATE_TERMINATE ||
997 session->state == ISCSI_STATE_LOGGED_IN ||
656cffc9 998 session->state == ISCSI_STATE_RECOVERY_FAILED);
7996a778
MC		 999 if (signal_pending(current))
1000 flush_signals(current);
1001
1002 spin_lock_bh(&session->lock);
1003 if (session->state == ISCSI_STATE_LOGGED_IN)
be2df72e 1004 printk(KERN_INFO "iscsi: host reset succeeded\n");
7996a778
MC		 1005 else
1006 goto failed;
1007 spin_unlock_bh(&session->lock);
1008
1009 return SUCCESS;
1010}
1011EXPORT_SYMBOL_GPL(iscsi_eh_host_reset);
1012
1013static void iscsi_tmabort_timedout(unsigned long data)
1014{
1015 struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)data;
1016 struct iscsi_conn *conn = ctask->conn;
1017 struct iscsi_session *session = conn->session;
1018
1019 spin_lock(&session->lock);
1020 if (conn->tmabort_state == TMABORT_INITIAL) {
1021 conn->tmabort_state = TMABORT_TIMEDOUT;
1022 debug_scsi("tmabort timedout [sc %p itt 0x%x]\n",
1023 ctask->sc, ctask->itt);
1024 /* unblock eh_abort() */
1025 wake_up(&conn->ehwait);
1026 }
1027 spin_unlock(&session->lock);
1028}
1029
1030/* must be called with the mutex lock */
1031static int iscsi_exec_abort_task(struct scsi_cmnd *sc,
1032 struct iscsi_cmd_task *ctask)
1033{
1034 struct iscsi_conn *conn = ctask->conn;
1035 struct iscsi_session *session = conn->session;
1036 struct iscsi_tm *hdr = &conn->tmhdr;
1037 int rc;
1038
1039 /*
1040 * ctask timed out but session is OK requests must be serialized.
1041 */
1042 memset(hdr, 0, sizeof(struct iscsi_tm));
1043 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
1044 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK;
1045 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
1046 memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
1047 hdr->rtt = ctask->hdr->itt;
1048 hdr->refcmdsn = ctask->hdr->cmdsn;
1049
1050 rc = iscsi_conn_send_generic(conn, (struct iscsi_hdr *)hdr,
1051 NULL, 0);
1052 if (rc) {
1053 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
d6e24d1c
PW		 1054 debug_scsi("abort sent failure [itt 0x%x] %d\n", ctask->itt,
1055 rc);
7996a778
MC		 1056 return rc;
1057 }
1058
1059 debug_scsi("abort sent [itt 0x%x]\n", ctask->itt);
1060
1061 spin_lock_bh(&session->lock);
1062 ctask->mtask = (struct iscsi_mgmt_task *)
b4377356 1063 session->mgmt_cmds[get_itt(hdr->itt) -
7996a778
MC		 1064 ISCSI_MGMT_ITT_OFFSET];
1065
1066 if (conn->tmabort_state == TMABORT_INITIAL) {
1067 conn->tmfcmd_pdus_cnt++;
1068 conn->tmabort_timer.expires = 10*HZ + jiffies;
1069 conn->tmabort_timer.function = iscsi_tmabort_timedout;
1070 conn->tmabort_timer.data = (unsigned long)ctask;
1071 add_timer(&conn->tmabort_timer);
d6e24d1c 1072 debug_scsi("abort set timeout [itt 0x%x]\n", ctask->itt);
7996a778
MC		 1073 }
1074 spin_unlock_bh(&session->lock);
1075 mutex_unlock(&conn->xmitmutex);
1076
1077 /*
1078 * block eh thread until:
1079 *
1080 * 1) abort response
1081 * 2) abort timeout
1082 * 3) session is terminated or restarted or userspace has
1083 * given up on recovery
1084 */
1085 wait_event_interruptible(conn->ehwait,
1086 sc->SCp.phase != session->age ||
1087 session->state != ISCSI_STATE_LOGGED_IN ||
656cffc9 1088 conn->tmabort_state != TMABORT_INITIAL);
7996a778
MC		 1089 if (signal_pending(current))
1090 flush_signals(current);
1091 del_timer_sync(&conn->tmabort_timer);
1092
1093 mutex_lock(&conn->xmitmutex);
1094 return 0;
1095}
1096
1097/*
1098 * xmit mutex and session lock must be held
1099 */
b6c395ed
MC		 1100static struct iscsi_mgmt_task *
1101iscsi_remove_mgmt_task(struct kfifo *fifo, uint32_t itt)
1102{
1103 int i, nr_tasks = __kfifo_len(fifo) / sizeof(void*);
1104 struct iscsi_mgmt_task *task;
1105
1106 debug_scsi("searching %d tasks\n", nr_tasks);
1107
1108 for (i = 0; i < nr_tasks; i++) {
1109 __kfifo_get(fifo, (void*)&task, sizeof(void*));
1110 debug_scsi("check task %u\n", task->itt);
1111
1112 if (task->itt == itt) {
1113 debug_scsi("matched task\n");
1114 return task;
1115 }
7996a778 1116
b6c395ed
MC		 1117 __kfifo_put(fifo, (void*)&task, sizeof(void*));
1118 }
1119 return NULL;
1120}
7996a778
MC		 1121
1122static int iscsi_ctask_mtask_cleanup(struct iscsi_cmd_task *ctask)
1123{
1124 struct iscsi_conn *conn = ctask->conn;
1125 struct iscsi_session *session = conn->session;
1126
1127 if (!ctask->mtask)
1128 return -EINVAL;
1129
1130 if (!iscsi_remove_mgmt_task(conn->immqueue, ctask->mtask->itt))
1131 list_del(&ctask->mtask->running);
1132 __kfifo_put(session->mgmtpool.queue, (void*)&ctask->mtask,
1133 sizeof(void*));
1134 ctask->mtask = NULL;
1135 return 0;
1136}
1137
1138/*
1139 * session lock and xmitmutex must be held
1140 */
1141static void fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
1142 int err)
1143{
1144 struct scsi_cmnd *sc;
1145
7996a778
MC		 1146 sc = ctask->sc;
1147 if (!sc)
1148 return;
e648f63c
MC		 1149
1150 conn->session->tt->cleanup_cmd_task(conn, ctask);
7ea8b828
MC		 1151 iscsi_ctask_mtask_cleanup(ctask);
1152
7996a778
MC		 1153 sc->result = err;
1154 sc->resid = sc->request_bufflen;
e648f63c 1155 /* release ref from queuecommand */
60ecebf5 1156 __iscsi_put_ctask(ctask);
7996a778
MC		 1157}
1158
1159int iscsi_eh_abort(struct scsi_cmnd *sc)
1160{
f47f2cf5
MC		 1161 struct iscsi_cmd_task *ctask;
1162 struct iscsi_conn *conn;
1163 struct iscsi_session *session;
7996a778
MC		 1164 int rc;
1165
f47f2cf5
MC		 1166 /*
1167 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
1168 * got the command.
1169 */
1170 if (!sc->SCp.ptr) {
1171 debug_scsi("sc never reached iscsi layer or it completed.\n");
1172 return SUCCESS;
1173 }
1174
1175 ctask = (struct iscsi_cmd_task *)sc->SCp.ptr;
1176 conn = ctask->conn;
1177 session = conn->session;
1178
7996a778
MC		 1179 conn->eh_abort_cnt++;
1180 debug_scsi("aborting [sc %p itt 0x%x]\n", sc, ctask->itt);
1181
1182 mutex_lock(&conn->xmitmutex);
1183 spin_lock_bh(&session->lock);
1184
1185 /*
1186 * If we are not logged in or we have started a new session
1187 * then let the host reset code handle this
1188 */
1189 if (session->state != ISCSI_STATE_LOGGED_IN ||
1190 sc->SCp.phase != session->age)
1191 goto failed;
1192
1193 /* ctask completed before time out */
7ea8b828
MC		 1194 if (!ctask->sc) {
1195 spin_unlock_bh(&session->lock);
1196 debug_scsi("sc completed while abort in progress\n");
1197 goto success_rel_mutex;
1198 }
7996a778
MC		 1199
1200 /* what should we do here ? */
1201 if (conn->ctask == ctask) {
be2df72e
OG		 1202 printk(KERN_INFO "iscsi: sc %p itt 0x%x partially sent. "
1203 "Failing abort\n", sc, ctask->itt);
7996a778
MC		 1204 goto failed;
1205 }
1206
b6c395ed 1207 if (ctask->state == ISCSI_TASK_PENDING)
7ea8b828 1208 goto success_cleanup;
7996a778
MC		 1209
1210 conn->tmabort_state = TMABORT_INITIAL;
1211
1212 spin_unlock_bh(&session->lock);
1213 rc = iscsi_exec_abort_task(sc, ctask);
1214 spin_lock_bh(&session->lock);
1215
7996a778
MC		 1216 if (rc || sc->SCp.phase != session->age ||
1217 session->state != ISCSI_STATE_LOGGED_IN)
1218 goto failed;
7ea8b828 1219 iscsi_ctask_mtask_cleanup(ctask);
7996a778 1220
7ea8b828
MC		 1221 switch (conn->tmabort_state) {
1222 case TMABORT_SUCCESS:
1223 goto success_cleanup;
1224 case TMABORT_NOT_FOUND:
1225 if (!ctask->sc) {
1226 /* ctask completed before tmf abort response */
1227 spin_unlock_bh(&session->lock);
1228 debug_scsi("sc completed while abort in progress\n");
1229 goto success_rel_mutex;
1230 }
1231 /* fall through */
1232 default:
1233 /* timedout or failed */
7996a778
MC		 1234 spin_unlock_bh(&session->lock);
1235 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1236 spin_lock_bh(&session->lock);
1237 goto failed;
1238 }
1239
7ea8b828 1240success_cleanup:
7996a778
MC		 1241 debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
1242 spin_unlock_bh(&session->lock);
1243
1244 /*
1245 * clean up task if aborted. we have the xmitmutex so grab
1246 * the recv lock as a writer
1247 */
1248 write_lock_bh(conn->recv_lock);
1249 spin_lock(&session->lock);
1250 fail_command(conn, ctask, DID_ABORT << 16);
1251 spin_unlock(&session->lock);
1252 write_unlock_bh(conn->recv_lock);
1253
7ea8b828 1254success_rel_mutex:
7996a778
MC		 1255 mutex_unlock(&conn->xmitmutex);
1256 return SUCCESS;
1257
1258failed:
1259 spin_unlock_bh(&session->lock);
1260 mutex_unlock(&conn->xmitmutex);
1261
1262 debug_scsi("abort failed [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
1263 return FAILED;
1264}
1265EXPORT_SYMBOL_GPL(iscsi_eh_abort);
1266
1267int
1268iscsi_pool_init(struct iscsi_queue *q, int max, void ***items, int item_size)
1269{
1270 int i;
1271
1272 *items = kmalloc(max * sizeof(void*), GFP_KERNEL);
1273 if (*items == NULL)
1274 return -ENOMEM;
1275
1276 q->max = max;
1277 q->pool = kmalloc(max * sizeof(void*), GFP_KERNEL);
1278 if (q->pool == NULL) {
1279 kfree(*items);
1280 return -ENOMEM;
1281 }
1282
1283 q->queue = kfifo_init((void*)q->pool, max * sizeof(void*),
1284 GFP_KERNEL, NULL);
1285 if (q->queue == ERR_PTR(-ENOMEM)) {
1286 kfree(q->pool);
1287 kfree(*items);
1288 return -ENOMEM;
1289 }
1290
1291 for (i = 0; i < max; i++) {
1292 q->pool[i] = kmalloc(item_size, GFP_KERNEL);
1293 if (q->pool[i] == NULL) {
1294 int j;
1295
1296 for (j = 0; j < i; j++)
1297 kfree(q->pool[j]);
1298
1299 kfifo_free(q->queue);
1300 kfree(q->pool);
1301 kfree(*items);
1302 return -ENOMEM;
1303 }
1304 memset(q->pool[i], 0, item_size);
1305 (*items)[i] = q->pool[i];
1306 __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*));
1307 }
1308 return 0;
1309}
1310EXPORT_SYMBOL_GPL(iscsi_pool_init);
1311
1312void iscsi_pool_free(struct iscsi_queue *q, void **items)
1313{
1314 int i;
1315
1316 for (i = 0; i < q->max; i++)
1317 kfree(items[i]);
1318 kfree(q->pool);
1319 kfree(items);
1320}
1321EXPORT_SYMBOL_GPL(iscsi_pool_free);
1322
1323/*
1324 * iSCSI Session's hostdata organization:
1325 *
1326 * *------------------* <== hostdata_session(host->hostdata)
1327 * | ptr to class sess|
1328 * |------------------| <== iscsi_hostdata(host->hostdata)
1329 * | iscsi_session |
1330 * *------------------*
1331 */
1332
1333#define hostdata_privsize(_sz) (sizeof(unsigned long) + _sz + \
1334 _sz % sizeof(unsigned long))
1335
1336#define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata))
1337
1338/**
1339 * iscsi_session_setup - create iscsi cls session and host and session
1340 * @scsit: scsi transport template
1341 * @iscsit: iscsi transport template
1342 * @initial_cmdsn: initial CmdSN
1343 * @hostno: host no allocated
1344 *
1345 * This can be used by software iscsi_transports that allocate
1346 * a session per scsi host.
1347 **/
1348struct iscsi_cls_session *
1349iscsi_session_setup(struct iscsi_transport *iscsit,
1350 struct scsi_transport_template *scsit,
1351 int cmd_task_size, int mgmt_task_size,
1352 uint32_t initial_cmdsn, uint32_t *hostno)
1353{
1354 struct Scsi_Host *shost;
1355 struct iscsi_session *session;
1356 struct iscsi_cls_session *cls_session;
1357 int cmd_i;
1358
1359 shost = scsi_host_alloc(iscsit->host_template,
1360 hostdata_privsize(sizeof(*session)));
1361 if (!shost)
1362 return NULL;
1363
1364 shost->max_id = 1;
1365 shost->max_channel = 0;
1366 shost->max_lun = iscsit->max_lun;
1367 shost->max_cmd_len = iscsit->max_cmd_len;
1368 shost->transportt = scsit;
1369 shost->transportt->create_work_queue = 1;
1370 *hostno = shost->host_no;
1371
1372 session = iscsi_hostdata(shost->hostdata);
1373 memset(session, 0, sizeof(struct iscsi_session));
1374 session->host = shost;
1375 session->state = ISCSI_STATE_FREE;
1376 session->mgmtpool_max = ISCSI_MGMT_CMDS_MAX;
1377 session->cmds_max = ISCSI_XMIT_CMDS_MAX;
1378 session->cmdsn = initial_cmdsn;
1379 session->exp_cmdsn = initial_cmdsn + 1;
1380 session->max_cmdsn = initial_cmdsn + 1;
1381 session->max_r2t = 1;
1382 session->tt = iscsit;
1383
1384 /* initialize SCSI PDU commands pool */
1385 if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
1386 (void***)&session->cmds,
1387 cmd_task_size + sizeof(struct iscsi_cmd_task)))
1388 goto cmdpool_alloc_fail;
1389
1390 /* pre-format cmds pool with ITT */
1391 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
1392 struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
1393
1394 if (cmd_task_size)
1395 ctask->dd_data = &ctask[1];
1396 ctask->itt = cmd_i;
b6c395ed 1397 INIT_LIST_HEAD(&ctask->running);
7996a778
MC		 1398 }
1399
1400 spin_lock_init(&session->lock);
7996a778
MC		 1401
1402 /* initialize immediate command pool */
1403 if (iscsi_pool_init(&session->mgmtpool, session->mgmtpool_max,
1404 (void***)&session->mgmt_cmds,
1405 mgmt_task_size + sizeof(struct iscsi_mgmt_task)))
1406 goto mgmtpool_alloc_fail;
1407
1408
1409 /* pre-format immediate cmds pool with ITT */
1410 for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) {
1411 struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i];
1412
1413 if (mgmt_task_size)
1414 mtask->dd_data = &mtask[1];
1415 mtask->itt = ISCSI_MGMT_ITT_OFFSET + cmd_i;
b6c395ed 1416 INIT_LIST_HEAD(&mtask->running);
7996a778
MC		 1417 }
1418
1419 if (scsi_add_host(shost, NULL))
1420 goto add_host_fail;
1421
f53a88da
MC		 1422 if (!try_module_get(iscsit->owner))
1423 goto cls_session_fail;
1424
6a8a0d36 1425 cls_session = iscsi_create_session(shost, iscsit, 0);
7996a778 1426 if (!cls_session)
f53a88da 1427 goto module_put;
7996a778
MC		 1428 *(unsigned long*)shost->hostdata = (unsigned long)cls_session;
1429
1430 return cls_session;
1431
f53a88da
MC		 1432module_put:
1433 module_put(iscsit->owner);
7996a778
MC		 1434cls_session_fail:
1435 scsi_remove_host(shost);
1436add_host_fail:
7996a778
MC		 1437 iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
1438mgmtpool_alloc_fail:
1439 iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
1440cmdpool_alloc_fail:
1441 scsi_host_put(shost);
1442 return NULL;
1443}
1444EXPORT_SYMBOL_GPL(iscsi_session_setup);
1445
1446/**
1447 * iscsi_session_teardown - destroy session, host, and cls_session
1448 * shost: scsi host
1449 *
1450 * This can be used by software iscsi_transports that allocate
1451 * a session per scsi host.
1452 **/
1453void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
1454{
1455 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
1456 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
63f75cc8 1457 struct module *owner = cls_session->transport->owner;
7996a778
MC		 1458
1459 scsi_remove_host(shost);
1460
7996a778
MC		 1461 iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
1462 iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
1463
f3ff0c36 1464 kfree(session->targetname);
0801c242 1465 kfree(session->hwaddress);
8ad5781a 1466 kfree(session->initiatorname);
f3ff0c36 1467
7996a778
MC		 1468 iscsi_destroy_session(cls_session);
1469 scsi_host_put(shost);
63f75cc8 1470 module_put(owner);
7996a778
MC		 1471}
1472EXPORT_SYMBOL_GPL(iscsi_session_teardown);
1473
1474/**
1475 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
1476 * @cls_session: iscsi_cls_session
1477 * @conn_idx: cid
1478 **/
1479struct iscsi_cls_conn *
1480iscsi_conn_setup(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
1481{
1482 struct iscsi_session *session = class_to_transport_session(cls_session);
1483 struct iscsi_conn *conn;
1484 struct iscsi_cls_conn *cls_conn;
d36ab6f3 1485 char *data;
7996a778
MC		 1486
1487 cls_conn = iscsi_create_conn(cls_session, conn_idx);
1488 if (!cls_conn)
1489 return NULL;
1490 conn = cls_conn->dd_data;
1491 memset(conn, 0, sizeof(*conn));
1492
1493 conn->session = session;
1494 conn->cls_conn = cls_conn;
1495 conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
1496 conn->id = conn_idx;
1497 conn->exp_statsn = 0;
1498 conn->tmabort_state = TMABORT_INITIAL;
1499 INIT_LIST_HEAD(&conn->run_list);
1500 INIT_LIST_HEAD(&conn->mgmt_run_list);
b6c395ed 1501 INIT_LIST_HEAD(&conn->xmitqueue);
7996a778
MC		 1502
1503 /* initialize general immediate & non-immediate PDU commands queue */
1504 conn->immqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*),
1505 GFP_KERNEL, NULL);
1506 if (conn->immqueue == ERR_PTR(-ENOMEM))
1507 goto immqueue_alloc_fail;
1508
1509 conn->mgmtqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*),
1510 GFP_KERNEL, NULL);
1511 if (conn->mgmtqueue == ERR_PTR(-ENOMEM))
1512 goto mgmtqueue_alloc_fail;
1513
c4028958 1514 INIT_WORK(&conn->xmitwork, iscsi_xmitworker);
7996a778
MC		 1515
1516 /* allocate login_mtask used for the login/text sequences */
1517 spin_lock_bh(&session->lock);
1518 if (!__kfifo_get(session->mgmtpool.queue,
1519 (void*)&conn->login_mtask,
1520 sizeof(void*))) {
1521 spin_unlock_bh(&session->lock);
1522 goto login_mtask_alloc_fail;
1523 }
1524 spin_unlock_bh(&session->lock);
1525
bf32ed33 1526 data = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN, GFP_KERNEL);
d36ab6f3
MC		 1527 if (!data)
1528 goto login_mtask_data_alloc_fail;
c8dc1e52 1529 conn->login_mtask->data = conn->data = data;
d36ab6f3 1530
7996a778
MC		 1531 init_timer(&conn->tmabort_timer);
1532 mutex_init(&conn->xmitmutex);
1533 init_waitqueue_head(&conn->ehwait);
1534
1535 return cls_conn;
1536
d36ab6f3
MC		 1537login_mtask_data_alloc_fail:
1538 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
1539 sizeof(void*));
7996a778
MC		 1540login_mtask_alloc_fail:
1541 kfifo_free(conn->mgmtqueue);
1542mgmtqueue_alloc_fail:
1543 kfifo_free(conn->immqueue);
1544immqueue_alloc_fail:
7996a778
MC		 1545 iscsi_destroy_conn(cls_conn);
1546 return NULL;
1547}
1548EXPORT_SYMBOL_GPL(iscsi_conn_setup);
1549
1550/**
1551 * iscsi_conn_teardown - teardown iscsi connection
1552 * cls_conn: iscsi class connection
1553 *
1554 * TODO: we may need to make this into a two step process
1555 * like scsi-mls remove + put host
1556 */
1557void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
1558{
1559 struct iscsi_conn *conn = cls_conn->dd_data;
1560 struct iscsi_session *session = conn->session;
1561 unsigned long flags;
1562
7996a778 1563 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
67a61114 1564 mutex_lock(&conn->xmitmutex);
7996a778
MC		 1565
1566 spin_lock_bh(&session->lock);
1567 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
1568 if (session->leadconn == conn) {
1569 /*
1570 * leading connection? then give up on recovery.
1571 */
1572 session->state = ISCSI_STATE_TERMINATE;
1573 wake_up(&conn->ehwait);
1574 }
1575 spin_unlock_bh(&session->lock);
1576
1577 mutex_unlock(&conn->xmitmutex);
1578
1579 /*
1580 * Block until all in-progress commands for this connection
1581 * time out or fail.
1582 */
1583 for (;;) {
1584 spin_lock_irqsave(session->host->host_lock, flags);
1585 if (!session->host->host_busy) { /* OK for ERL == 0 */
1586 spin_unlock_irqrestore(session->host->host_lock, flags);
1587 break;
1588 }
1589 spin_unlock_irqrestore(session->host->host_lock, flags);
1590 msleep_interruptible(500);
be2df72e
OG		 1591 printk(KERN_INFO "iscsi: scsi conn_destroy(): host_busy %d "
1592 "host_failed %d\n", session->host->host_busy,
1593 session->host->host_failed);
7996a778
MC		 1594 /*
1595 * force eh_abort() to unblock
1596 */
1597 wake_up(&conn->ehwait);
1598 }
1599
779ea120
MC		 1600 /* flush queued up work because we free the connection below */
1601 scsi_flush_work(session->host);
1602
7996a778 1603 spin_lock_bh(&session->lock);
c8dc1e52 1604 kfree(conn->data);
f3ff0c36 1605 kfree(conn->persistent_address);
7996a778
MC		 1606 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
1607 sizeof(void*));
98644047 1608 if (session->leadconn == conn) {
7996a778 1609 session->leadconn = NULL;
7996a778
MC		 1610 /* no connections exits.. reset sequencing */
1611 session->cmdsn = session->max_cmdsn = session->exp_cmdsn = 1;
98644047 1612 }
7996a778
MC		 1613 spin_unlock_bh(&session->lock);
1614
7996a778
MC		 1615 kfifo_free(conn->immqueue);
1616 kfifo_free(conn->mgmtqueue);
1617
1618 iscsi_destroy_conn(cls_conn);
1619}
1620EXPORT_SYMBOL_GPL(iscsi_conn_teardown);
1621
1622int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
1623{
1624 struct iscsi_conn *conn = cls_conn->dd_data;
1625 struct iscsi_session *session = conn->session;
1626
ffd0436e 1627 if (!session) {
7996a778
MC		 1628 printk(KERN_ERR "iscsi: can't start unbound connection\n");
1629 return -EPERM;
1630 }
1631
db98ccde
MC		 1632 if ((session->imm_data_en || !session->initial_r2t_en) &&
1633 session->first_burst > session->max_burst) {
ffd0436e
MC		 1634 printk("iscsi: invalid burst lengths: "
1635 "first_burst %d max_burst %d\n",
1636 session->first_burst, session->max_burst);
1637 return -EINVAL;
1638 }
1639
7996a778
MC		 1640 spin_lock_bh(&session->lock);
1641 conn->c_stage = ISCSI_CONN_STARTED;
1642 session->state = ISCSI_STATE_LOGGED_IN;
1643
1644 switch(conn->stop_stage) {
1645 case STOP_CONN_RECOVER:
1646 /*
1647 * unblock eh_abort() if it is blocked. re-try all
1648 * commands after successful recovery
1649 */
7996a778
MC		 1650 conn->stop_stage = 0;
1651 conn->tmabort_state = TMABORT_INITIAL;
1652 session->age++;
7996a778
MC		 1653 spin_unlock_bh(&session->lock);
1654
1655 iscsi_unblock_session(session_to_cls(session));
1656 wake_up(&conn->ehwait);
1657 return 0;
1658 case STOP_CONN_TERM:
7996a778 1659 conn->stop_stage = 0;
7996a778
MC		 1660 break;
1661 default:
1662 break;
1663 }
1664 spin_unlock_bh(&session->lock);
1665
1666 return 0;
1667}
1668EXPORT_SYMBOL_GPL(iscsi_conn_start);
1669
1670static void
1671flush_control_queues(struct iscsi_session *session, struct iscsi_conn *conn)
1672{
1673 struct iscsi_mgmt_task *mtask, *tmp;
1674
1675 /* handle pending */
1676 while (__kfifo_get(conn->immqueue, (void*)&mtask, sizeof(void*)) ||
1677 __kfifo_get(conn->mgmtqueue, (void*)&mtask, sizeof(void*))) {
1678 if (mtask == conn->login_mtask)
1679 continue;
1680 debug_scsi("flushing pending mgmt task itt 0x%x\n", mtask->itt);
1681 __kfifo_put(session->mgmtpool.queue, (void*)&mtask,
1682 sizeof(void*));
1683 }
1684
1685 /* handle running */
1686 list_for_each_entry_safe(mtask, tmp, &conn->mgmt_run_list, running) {
1687 debug_scsi("flushing running mgmt task itt 0x%x\n", mtask->itt);
ed2abc7f
MC		 1688 list_del(&mtask->running);
1689
7996a778
MC		 1690 if (mtask == conn->login_mtask)
1691 continue;
ed2abc7f 1692 __kfifo_put(session->mgmtpool.queue, (void*)&mtask,
7996a778
MC		 1693 sizeof(void*));
1694 }
1695
1696 conn->mtask = NULL;
1697}
1698
1699/* Fail commands. Mutex and session lock held and recv side suspended */
1700static void fail_all_commands(struct iscsi_conn *conn)
1701{
1702 struct iscsi_cmd_task *ctask, *tmp;
1703
1704 /* flush pending */
b6c395ed 1705 list_for_each_entry_safe(ctask, tmp, &conn->xmitqueue, running) {
7996a778
MC		 1706 debug_scsi("failing pending sc %p itt 0x%x\n", ctask->sc,
1707 ctask->itt);
1708 fail_command(conn, ctask, DID_BUS_BUSY << 16);
1709 }
1710
1711 /* fail all other running */
1712 list_for_each_entry_safe(ctask, tmp, &conn->run_list, running) {
1713 debug_scsi("failing in progress sc %p itt 0x%x\n",
1714 ctask->sc, ctask->itt);
1715 fail_command(conn, ctask, DID_BUS_BUSY << 16);
1716 }
1717
1718 conn->ctask = NULL;
1719}
1720
656cffc9
MC		 1721static void iscsi_start_session_recovery(struct iscsi_session *session,
1722 struct iscsi_conn *conn, int flag)
7996a778 1723{
ed2abc7f
MC		 1724 int old_stop_stage;
1725
7996a778 1726 spin_lock_bh(&session->lock);
ed2abc7f 1727 if (conn->stop_stage == STOP_CONN_TERM) {
7996a778
MC		 1728 spin_unlock_bh(&session->lock);
1729 return;
1730 }
ed2abc7f
MC		 1731
1732 /*
1733 * When this is called for the in_login state, we only want to clean
67a61114
MC		 1734 * up the login task and connection. We do not need to block and set
1735 * the recovery state again
ed2abc7f 1736 */
67a61114
MC		 1737 if (flag == STOP_CONN_TERM)
1738 session->state = ISCSI_STATE_TERMINATE;
1739 else if (conn->stop_stage != STOP_CONN_RECOVER)
1740 session->state = ISCSI_STATE_IN_RECOVERY;
ed2abc7f
MC		 1741
1742 old_stop_stage = conn->stop_stage;
7996a778 1743 conn->stop_stage = flag;
67a61114
MC		 1744 conn->c_stage = ISCSI_CONN_STOPPED;
1745 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
7996a778
MC		 1746 spin_unlock_bh(&session->lock);
1747
1c83469d
MC		 1748 write_lock_bh(conn->recv_lock);
1749 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
1750 write_unlock_bh(conn->recv_lock);
7996a778
MC		 1751
1752 mutex_lock(&conn->xmitmutex);
7996a778
MC		 1753 /*
1754 * for connection level recovery we should not calculate
1755 * header digest. conn->hdr_size used for optimization
1756 * in hdr_extract() and will be re-negotiated at
1757 * set_param() time.
1758 */
1759 if (flag == STOP_CONN_RECOVER) {
1760 conn->hdrdgst_en = 0;
1761 conn->datadgst_en = 0;
656cffc9 1762 if (session->state == ISCSI_STATE_IN_RECOVERY &&
67a61114
MC		 1763 old_stop_stage != STOP_CONN_RECOVER) {
1764 debug_scsi("blocking session\n");
7996a778 1765 iscsi_block_session(session_to_cls(session));
67a61114 1766 }
7996a778 1767 }
656cffc9 1768
656cffc9
MC		 1769 /*
1770 * flush queues.
1771 */
1772 spin_lock_bh(&session->lock);
1773 fail_all_commands(conn);
1774 flush_control_queues(session, conn);
1775 spin_unlock_bh(&session->lock);
1776
7996a778
MC		 1777 mutex_unlock(&conn->xmitmutex);
1778}
7996a778
MC		 1779
1780void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
1781{
1782 struct iscsi_conn *conn = cls_conn->dd_data;
1783 struct iscsi_session *session = conn->session;
1784
1785 switch (flag) {
1786 case STOP_CONN_RECOVER:
1787 case STOP_CONN_TERM:
1788 iscsi_start_session_recovery(session, conn, flag);
8d2860b3 1789 break;
7996a778 1790 default:
be2df72e 1791 printk(KERN_ERR "iscsi: invalid stop flag %d\n", flag);
7996a778
MC		 1792 }
1793}
1794EXPORT_SYMBOL_GPL(iscsi_conn_stop);
1795
1796int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
1797 struct iscsi_cls_conn *cls_conn, int is_leading)
1798{
1799 struct iscsi_session *session = class_to_transport_session(cls_session);
98644047 1800 struct iscsi_conn *conn = cls_conn->dd_data;
7996a778 1801
7996a778 1802 spin_lock_bh(&session->lock);
7996a778
MC		 1803 if (is_leading)
1804 session->leadconn = conn;
98644047 1805 spin_unlock_bh(&session->lock);
7996a778
MC		 1806
1807 /*
1808 * Unblock xmitworker(), Login Phase will pass through.
1809 */
1810 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
1811 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1812 return 0;
1813}
1814EXPORT_SYMBOL_GPL(iscsi_conn_bind);
1815
a54a52ca
MC		 1816
1817int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
1818 enum iscsi_param param, char *buf, int buflen)
1819{
1820 struct iscsi_conn *conn = cls_conn->dd_data;
1821 struct iscsi_session *session = conn->session;
1822 uint32_t value;
1823
1824 switch(param) {
1825 case ISCSI_PARAM_MAX_RECV_DLENGTH:
1826 sscanf(buf, "%d", &conn->max_recv_dlength);
1827 break;
1828 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
1829 sscanf(buf, "%d", &conn->max_xmit_dlength);
1830 break;
1831 case ISCSI_PARAM_HDRDGST_EN:
1832 sscanf(buf, "%d", &conn->hdrdgst_en);
1833 break;
1834 case ISCSI_PARAM_DATADGST_EN:
1835 sscanf(buf, "%d", &conn->datadgst_en);
1836 break;
1837 case ISCSI_PARAM_INITIAL_R2T_EN:
1838 sscanf(buf, "%d", &session->initial_r2t_en);
1839 break;
1840 case ISCSI_PARAM_MAX_R2T:
1841 sscanf(buf, "%d", &session->max_r2t);
1842 break;
1843 case ISCSI_PARAM_IMM_DATA_EN:
1844 sscanf(buf, "%d", &session->imm_data_en);
1845 break;
1846 case ISCSI_PARAM_FIRST_BURST:
1847 sscanf(buf, "%d", &session->first_burst);
1848 break;
1849 case ISCSI_PARAM_MAX_BURST:
1850 sscanf(buf, "%d", &session->max_burst);
1851 break;
1852 case ISCSI_PARAM_PDU_INORDER_EN:
1853 sscanf(buf, "%d", &session->pdu_inorder_en);
1854 break;
1855 case ISCSI_PARAM_DATASEQ_INORDER_EN:
1856 sscanf(buf, "%d", &session->dataseq_inorder_en);
1857 break;
1858 case ISCSI_PARAM_ERL:
1859 sscanf(buf, "%d", &session->erl);
1860 break;
1861 case ISCSI_PARAM_IFMARKER_EN:
1862 sscanf(buf, "%d", &value);
1863 BUG_ON(value);
1864 break;
1865 case ISCSI_PARAM_OFMARKER_EN:
1866 sscanf(buf, "%d", &value);
1867 BUG_ON(value);
1868 break;
1869 case ISCSI_PARAM_EXP_STATSN:
1870 sscanf(buf, "%u", &conn->exp_statsn);
1871 break;
1872 case ISCSI_PARAM_TARGET_NAME:
1873 /* this should not change between logins */
1874 if (session->targetname)
1875 break;
1876
1877 session->targetname = kstrdup(buf, GFP_KERNEL);
1878 if (!session->targetname)
1879 return -ENOMEM;
1880 break;
1881 case ISCSI_PARAM_TPGT:
1882 sscanf(buf, "%d", &session->tpgt);
1883 break;
1884 case ISCSI_PARAM_PERSISTENT_PORT:
1885 sscanf(buf, "%d", &conn->persistent_port);
1886 break;
1887 case ISCSI_PARAM_PERSISTENT_ADDRESS:
1888 /*
1889 * this is the address returned in discovery so it should
1890 * not change between logins.
1891 */
1892 if (conn->persistent_address)
1893 break;
1894
1895 conn->persistent_address = kstrdup(buf, GFP_KERNEL);
1896 if (!conn->persistent_address)
1897 return -ENOMEM;
1898 break;
1899 default:
1900 return -ENOSYS;
1901 }
1902
1903 return 0;
1904}
1905EXPORT_SYMBOL_GPL(iscsi_set_param);
1906
1907int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
1908 enum iscsi_param param, char *buf)
1909{
1910 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
1911 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
1912 int len;
1913
1914 switch(param) {
1915 case ISCSI_PARAM_INITIAL_R2T_EN:
1916 len = sprintf(buf, "%d\n", session->initial_r2t_en);
1917 break;
1918 case ISCSI_PARAM_MAX_R2T:
1919 len = sprintf(buf, "%hu\n", session->max_r2t);
1920 break;
1921 case ISCSI_PARAM_IMM_DATA_EN:
1922 len = sprintf(buf, "%d\n", session->imm_data_en);
1923 break;
1924 case ISCSI_PARAM_FIRST_BURST:
1925 len = sprintf(buf, "%u\n", session->first_burst);
1926 break;
1927 case ISCSI_PARAM_MAX_BURST:
1928 len = sprintf(buf, "%u\n", session->max_burst);
1929 break;
1930 case ISCSI_PARAM_PDU_INORDER_EN:
1931 len = sprintf(buf, "%d\n", session->pdu_inorder_en);
1932 break;
1933 case ISCSI_PARAM_DATASEQ_INORDER_EN:
1934 len = sprintf(buf, "%d\n", session->dataseq_inorder_en);
1935 break;
1936 case ISCSI_PARAM_ERL:
1937 len = sprintf(buf, "%d\n", session->erl);
1938 break;
1939 case ISCSI_PARAM_TARGET_NAME:
1940 len = sprintf(buf, "%s\n", session->targetname);
1941 break;
1942 case ISCSI_PARAM_TPGT:
1943 len = sprintf(buf, "%d\n", session->tpgt);
1944 break;
1945 default:
1946 return -ENOSYS;
1947 }
1948
1949 return len;
1950}
1951EXPORT_SYMBOL_GPL(iscsi_session_get_param);
1952
1953int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
1954 enum iscsi_param param, char *buf)
1955{
1956 struct iscsi_conn *conn = cls_conn->dd_data;
1957 int len;
1958
1959 switch(param) {
1960 case ISCSI_PARAM_MAX_RECV_DLENGTH:
1961 len = sprintf(buf, "%u\n", conn->max_recv_dlength);
1962 break;
1963 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
1964 len = sprintf(buf, "%u\n", conn->max_xmit_dlength);
1965 break;
1966 case ISCSI_PARAM_HDRDGST_EN:
1967 len = sprintf(buf, "%d\n", conn->hdrdgst_en);
1968 break;
1969 case ISCSI_PARAM_DATADGST_EN:
1970 len = sprintf(buf, "%d\n", conn->datadgst_en);
1971 break;
1972 case ISCSI_PARAM_IFMARKER_EN:
1973 len = sprintf(buf, "%d\n", conn->ifmarker_en);
1974 break;
1975 case ISCSI_PARAM_OFMARKER_EN:
1976 len = sprintf(buf, "%d\n", conn->ofmarker_en);
1977 break;
1978 case ISCSI_PARAM_EXP_STATSN:
1979 len = sprintf(buf, "%u\n", conn->exp_statsn);
1980 break;
1981 case ISCSI_PARAM_PERSISTENT_PORT:
1982 len = sprintf(buf, "%d\n", conn->persistent_port);
1983 break;
1984 case ISCSI_PARAM_PERSISTENT_ADDRESS:
1985 len = sprintf(buf, "%s\n", conn->persistent_address);
1986 break;
1987 default:
1988 return -ENOSYS;
1989 }
1990
1991 return len;
1992}
1993EXPORT_SYMBOL_GPL(iscsi_conn_get_param);
1994
0801c242
MC		 1995int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param,
1996 char *buf)
1997{
1998 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
1999 int len;
2000
2001 switch (param) {
2002 case ISCSI_HOST_PARAM_HWADDRESS:
2003 if (!session->hwaddress)
2004 len = sprintf(buf, "%s\n", "default");
2005 else
2006 len = sprintf(buf, "%s\n", session->hwaddress);
2007 break;
8ad5781a
MC		 2008 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2009 if (!session->initiatorname)
2010 len = sprintf(buf, "%s\n", "unknown");
2011 else
2012 len = sprintf(buf, "%s\n", session->initiatorname);
2013 break;
2014
0801c242
MC		 2015 default:
2016 return -ENOSYS;
2017 }
2018
2019 return len;
2020}
2021EXPORT_SYMBOL_GPL(iscsi_host_get_param);
2022
2023int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2024 char *buf, int buflen)
2025{
2026 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
2027
2028 switch (param) {
2029 case ISCSI_HOST_PARAM_HWADDRESS:
2030 if (!session->hwaddress)
2031 session->hwaddress = kstrdup(buf, GFP_KERNEL);
2032 break;
8ad5781a
MC		 2033 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2034 if (!session->initiatorname)
2035 session->initiatorname = kstrdup(buf, GFP_KERNEL);
2036 break;
0801c242
MC		 2037 default:
2038 return -ENOSYS;
2039 }
2040
2041 return 0;
2042}
2043EXPORT_SYMBOL_GPL(iscsi_host_set_param);
2044
7996a778
MC		 2045MODULE_AUTHOR("Mike Christie");
2046MODULE_DESCRIPTION("iSCSI library functions");
2047MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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