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176458f3531641c91aee31fa52c9190377af4337
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / scsi / libiscsi.c
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/kfifo.h>
26 #include <linux/delay.h>
27 #include <asm/unaligned.h>
28 #include <net/tcp.h>
29 #include <scsi/scsi_cmnd.h>
30 #include <scsi/scsi_device.h>
31 #include <scsi/scsi_eh.h>
32 #include <scsi/scsi_tcq.h>
33 #include <scsi/scsi_host.h>
34 #include <scsi/scsi.h>
35 #include <scsi/iscsi_proto.h>
36 #include <scsi/scsi_transport.h>
37 #include <scsi/scsi_transport_iscsi.h>
38 #include <scsi/libiscsi.h>
39
40 struct iscsi_session *
41 class_to_transport_session(struct iscsi_cls_session *cls_session)
42 {
43 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
44 return iscsi_hostdata(shost->hostdata);
45 }
46 EXPORT_SYMBOL_GPL(class_to_transport_session);
47
48 /* Serial Number Arithmetic, 32 bits, less than, RFC1982 */
49 #define SNA32_CHECK 2147483648UL
50
51 static int iscsi_sna_lt(u32 n1, u32 n2)
52 {
53 return n1 != n2 && ((n1 < n2 && (n2 - n1 < SNA32_CHECK)) ||
54 (n1 > n2 && (n2 - n1 < SNA32_CHECK)));
55 }
56
57 /* Serial Number Arithmetic, 32 bits, less than, RFC1982 */
58 static int iscsi_sna_lte(u32 n1, u32 n2)
59 {
60 return n1 == n2 || ((n1 < n2 && (n2 - n1 < SNA32_CHECK)) ||
61 (n1 > n2 && (n2 - n1 < SNA32_CHECK)));
62 }
63
64 void
65 iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr)
66 {
67 uint32_t max_cmdsn = be32_to_cpu(hdr->max_cmdsn);
68 uint32_t exp_cmdsn = be32_to_cpu(hdr->exp_cmdsn);
69
70 /*
71 * standard specifies this check for when to update expected and
72 * max sequence numbers
73 */
74 if (iscsi_sna_lt(max_cmdsn, exp_cmdsn - 1))
75 return;
76
77 if (exp_cmdsn != session->exp_cmdsn &&
78 !iscsi_sna_lt(exp_cmdsn, session->exp_cmdsn))
79 session->exp_cmdsn = exp_cmdsn;
80
81 if (max_cmdsn != session->max_cmdsn &&
82 !iscsi_sna_lt(max_cmdsn, session->max_cmdsn)) {
83 session->max_cmdsn = max_cmdsn;
84 /*
85 * if the window closed with IO queued, then kick the
86 * xmit thread
87 */
88 if (!list_empty(&session->leadconn->xmitqueue) ||
89 !list_empty(&session->leadconn->mgmtqueue))
90 scsi_queue_work(session->host,
91 &session->leadconn->xmitwork);
92 }
93 }
94 EXPORT_SYMBOL_GPL(iscsi_update_cmdsn);
95
96 void iscsi_prep_unsolicit_data_pdu(struct iscsi_cmd_task *ctask,
97 struct iscsi_data *hdr)
98 {
99 struct iscsi_conn *conn = ctask->conn;
100
101 memset(hdr, 0, sizeof(struct iscsi_data));
102 hdr->ttt = cpu_to_be32(ISCSI_RESERVED_TAG);
103 hdr->datasn = cpu_to_be32(ctask->unsol_datasn);
104 ctask->unsol_datasn++;
105 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
106 memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
107
108 hdr->itt = ctask->hdr->itt;
109 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
110 hdr->offset = cpu_to_be32(ctask->unsol_offset);
111
112 if (ctask->unsol_count > conn->max_xmit_dlength) {
113 hton24(hdr->dlength, conn->max_xmit_dlength);
114 ctask->data_count = conn->max_xmit_dlength;
115 ctask->unsol_offset += ctask->data_count;
116 hdr->flags = 0;
117 } else {
118 hton24(hdr->dlength, ctask->unsol_count);
119 ctask->data_count = ctask->unsol_count;
120 hdr->flags = ISCSI_FLAG_CMD_FINAL;
121 }
122 }
123 EXPORT_SYMBOL_GPL(iscsi_prep_unsolicit_data_pdu);
124
125 /**
126 * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
127 * @ctask: iscsi cmd task
128 *
129 * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set
130 * fields like dlength or final based on how much data it sends
131 */
132 static void iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask)
133 {
134 struct iscsi_conn *conn = ctask->conn;
135 struct iscsi_session *session = conn->session;
136 struct iscsi_cmd *hdr = ctask->hdr;
137 struct scsi_cmnd *sc = ctask->sc;
138
139 hdr->opcode = ISCSI_OP_SCSI_CMD;
140 hdr->flags = ISCSI_ATTR_SIMPLE;
141 int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun);
142 hdr->itt = build_itt(ctask->itt, conn->id, session->age);
143 hdr->data_length = cpu_to_be32(scsi_bufflen(sc));
144 hdr->cmdsn = cpu_to_be32(session->cmdsn);
145 session->cmdsn++;
146 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
147 memcpy(hdr->cdb, sc->cmnd, sc->cmd_len);
148 if (sc->cmd_len < MAX_COMMAND_SIZE)
149 memset(&hdr->cdb[sc->cmd_len], 0,
150 MAX_COMMAND_SIZE - sc->cmd_len);
151
152 ctask->data_count = 0;
153 ctask->imm_count = 0;
154 if (sc->sc_data_direction == DMA_TO_DEVICE) {
155 hdr->flags |= ISCSI_FLAG_CMD_WRITE;
156 /*
157 * Write counters:
158 *
159 * imm_count bytes to be sent right after
160 * SCSI PDU Header
161 *
162 * unsol_count bytes(as Data-Out) to be sent
163 * without R2T ack right after
164 * immediate data
165 *
166 * r2t_data_count bytes to be sent via R2T ack's
167 *
168 * pad_count bytes to be sent as zero-padding
169 */
170 ctask->unsol_count = 0;
171 ctask->unsol_offset = 0;
172 ctask->unsol_datasn = 0;
173
174 if (session->imm_data_en) {
175 if (scsi_bufflen(sc) >= session->first_burst)
176 ctask->imm_count = min(session->first_burst,
177 conn->max_xmit_dlength);
178 else
179 ctask->imm_count = min(scsi_bufflen(sc),
180 conn->max_xmit_dlength);
181 hton24(ctask->hdr->dlength, ctask->imm_count);
182 } else
183 zero_data(ctask->hdr->dlength);
184
185 if (!session->initial_r2t_en) {
186 ctask->unsol_count = min((session->first_burst),
187 (scsi_bufflen(sc))) - ctask->imm_count;
188 ctask->unsol_offset = ctask->imm_count;
189 }
190
191 if (!ctask->unsol_count)
192 /* No unsolicit Data-Out's */
193 ctask->hdr->flags |= ISCSI_FLAG_CMD_FINAL;
194 } else {
195 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
196 zero_data(hdr->dlength);
197
198 if (sc->sc_data_direction == DMA_FROM_DEVICE)
199 hdr->flags |= ISCSI_FLAG_CMD_READ;
200 }
201
202 conn->scsicmd_pdus_cnt++;
203
204 debug_scsi("iscsi prep [%s cid %d sc %p cdb 0x%x itt 0x%x len %d "
205 "cmdsn %d win %d]\n",
206 sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read",
207 conn->id, sc, sc->cmnd[0], ctask->itt, scsi_bufflen(sc),
208 session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1);
209 }
210
211 /**
212 * iscsi_complete_command - return command back to scsi-ml
213 * @ctask: iscsi cmd task
214 *
215 * Must be called with session lock.
216 * This function returns the scsi command to scsi-ml and returns
217 * the cmd task to the pool of available cmd tasks.
218 */
219 static void iscsi_complete_command(struct iscsi_cmd_task *ctask)
220 {
221 struct iscsi_session *session = ctask->conn->session;
222 struct scsi_cmnd *sc = ctask->sc;
223
224 ctask->state = ISCSI_TASK_COMPLETED;
225 ctask->sc = NULL;
226 /* SCSI eh reuses commands to verify us */
227 sc->SCp.ptr = NULL;
228 list_del_init(&ctask->running);
229 __kfifo_put(session->cmdpool.queue, (void*)&ctask, sizeof(void*));
230 sc->scsi_done(sc);
231 }
232
233 static void __iscsi_get_ctask(struct iscsi_cmd_task *ctask)
234 {
235 atomic_inc(&ctask->refcount);
236 }
237
238 static void __iscsi_put_ctask(struct iscsi_cmd_task *ctask)
239 {
240 if (atomic_dec_and_test(&ctask->refcount))
241 iscsi_complete_command(ctask);
242 }
243
244 /**
245 * iscsi_cmd_rsp - SCSI Command Response processing
246 * @conn: iscsi connection
247 * @hdr: iscsi header
248 * @ctask: scsi command task
249 * @data: cmd data buffer
250 * @datalen: len of buffer
251 *
252 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and
253 * then completes the command and task.
254 **/
255 static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
256 struct iscsi_cmd_task *ctask, char *data,
257 int datalen)
258 {
259 struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)hdr;
260 struct iscsi_session *session = conn->session;
261 struct scsi_cmnd *sc = ctask->sc;
262
263 iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr);
264 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
265
266 sc->result = (DID_OK << 16) | rhdr->cmd_status;
267
268 if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) {
269 sc->result = DID_ERROR << 16;
270 goto out;
271 }
272
273 if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) {
274 uint16_t senselen;
275
276 if (datalen < 2) {
277 invalid_datalen:
278 printk(KERN_ERR "iscsi: Got CHECK_CONDITION but "
279 "invalid data buffer size of %d\n", datalen);
280 sc->result = DID_BAD_TARGET << 16;
281 goto out;
282 }
283
284 senselen = be16_to_cpu(get_unaligned((__be16 *) data));
285 if (datalen < senselen)
286 goto invalid_datalen;
287
288 memcpy(sc->sense_buffer, data + 2,
289 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
290 debug_scsi("copied %d bytes of sense\n",
291 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
292 }
293
294 if (rhdr->flags & ISCSI_FLAG_CMD_UNDERFLOW) {
295 int res_count = be32_to_cpu(rhdr->residual_count);
296
297 if (res_count > 0 && res_count <= scsi_bufflen(sc))
298 scsi_set_resid(sc, res_count);
299 else
300 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
301 } else if (rhdr->flags & ISCSI_FLAG_CMD_BIDI_UNDERFLOW)
302 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
303 else if (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW)
304 scsi_set_resid(sc, be32_to_cpu(rhdr->residual_count));
305
306 out:
307 debug_scsi("done [sc %lx res %d itt 0x%x]\n",
308 (long)sc, sc->result, ctask->itt);
309 conn->scsirsp_pdus_cnt++;
310
311 __iscsi_put_ctask(ctask);
312 }
313
314 static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
315 {
316 struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr;
317
318 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
319 conn->tmfrsp_pdus_cnt++;
320
321 if (conn->tmf_state != TMF_QUEUED)
322 return;
323
324 if (tmf->response == ISCSI_TMF_RSP_COMPLETE)
325 conn->tmf_state = TMF_SUCCESS;
326 else if (tmf->response == ISCSI_TMF_RSP_NO_TASK)
327 conn->tmf_state = TMF_NOT_FOUND;
328 else
329 conn->tmf_state = TMF_FAILED;
330 wake_up(&conn->ehwait);
331 }
332
333 static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
334 char *data, int datalen)
335 {
336 struct iscsi_reject *reject = (struct iscsi_reject *)hdr;
337 struct iscsi_hdr rejected_pdu;
338 uint32_t itt;
339
340 conn->exp_statsn = be32_to_cpu(reject->statsn) + 1;
341
342 if (reject->reason == ISCSI_REASON_DATA_DIGEST_ERROR) {
343 if (ntoh24(reject->dlength) > datalen)
344 return ISCSI_ERR_PROTO;
345
346 if (ntoh24(reject->dlength) >= sizeof(struct iscsi_hdr)) {
347 memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr));
348 itt = get_itt(rejected_pdu.itt);
349 printk(KERN_ERR "itt 0x%x had pdu (op 0x%x) rejected "
350 "due to DataDigest error.\n", itt,
351 rejected_pdu.opcode);
352 }
353 }
354 return 0;
355 }
356
357 /**
358 * __iscsi_complete_pdu - complete pdu
359 * @conn: iscsi conn
360 * @hdr: iscsi header
361 * @data: data buffer
362 * @datalen: len of data buffer
363 *
364 * Completes pdu processing by freeing any resources allocated at
365 * queuecommand or send generic. session lock must be held and verify
366 * itt must have been called.
367 */
368 int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
369 char *data, int datalen)
370 {
371 struct iscsi_session *session = conn->session;
372 int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0;
373 struct iscsi_cmd_task *ctask;
374 struct iscsi_mgmt_task *mtask;
375 uint32_t itt;
376
377 if (hdr->itt != RESERVED_ITT)
378 itt = get_itt(hdr->itt);
379 else
380 itt = ~0U;
381
382 if (itt < session->cmds_max) {
383 ctask = session->cmds[itt];
384
385 debug_scsi("cmdrsp [op 0x%x cid %d itt 0x%x len %d]\n",
386 opcode, conn->id, ctask->itt, datalen);
387
388 switch(opcode) {
389 case ISCSI_OP_SCSI_CMD_RSP:
390 BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
391 iscsi_scsi_cmd_rsp(conn, hdr, ctask, data,
392 datalen);
393 break;
394 case ISCSI_OP_SCSI_DATA_IN:
395 BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
396 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
397 conn->scsirsp_pdus_cnt++;
398 __iscsi_put_ctask(ctask);
399 }
400 break;
401 case ISCSI_OP_R2T:
402 /* LLD handles this for now */
403 break;
404 default:
405 rc = ISCSI_ERR_BAD_OPCODE;
406 break;
407 }
408 } else if (itt >= ISCSI_MGMT_ITT_OFFSET &&
409 itt < ISCSI_MGMT_ITT_OFFSET + session->mgmtpool_max) {
410 mtask = session->mgmt_cmds[itt - ISCSI_MGMT_ITT_OFFSET];
411
412 debug_scsi("immrsp [op 0x%x cid %d itt 0x%x len %d]\n",
413 opcode, conn->id, mtask->itt, datalen);
414
415 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
416 switch(opcode) {
417 case ISCSI_OP_LOGOUT_RSP:
418 if (datalen) {
419 rc = ISCSI_ERR_PROTO;
420 break;
421 }
422 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
423 /* fall through */
424 case ISCSI_OP_LOGIN_RSP:
425 case ISCSI_OP_TEXT_RSP:
426 /*
427 * login related PDU's exp_statsn is handled in
428 * userspace
429 */
430 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
431 rc = ISCSI_ERR_CONN_FAILED;
432 list_del_init(&mtask->running);
433 if (conn->login_mtask != mtask)
434 __kfifo_put(session->mgmtpool.queue,
435 (void*)&mtask, sizeof(void*));
436 break;
437 case ISCSI_OP_SCSI_TMFUNC_RSP:
438 if (datalen) {
439 rc = ISCSI_ERR_PROTO;
440 break;
441 }
442
443 iscsi_tmf_rsp(conn, hdr);
444 break;
445 case ISCSI_OP_NOOP_IN:
446 if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) {
447 rc = ISCSI_ERR_PROTO;
448 break;
449 }
450 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
451
452 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
453 rc = ISCSI_ERR_CONN_FAILED;
454 list_del_init(&mtask->running);
455 __kfifo_put(session->mgmtpool.queue,
456 (void*)&mtask, sizeof(void*));
457 break;
458 default:
459 rc = ISCSI_ERR_BAD_OPCODE;
460 break;
461 }
462 } else if (itt == ~0U) {
463 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
464
465 switch(opcode) {
466 case ISCSI_OP_NOOP_IN:
467 if (datalen) {
468 rc = ISCSI_ERR_PROTO;
469 break;
470 }
471
472 if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG))
473 break;
474
475 if (iscsi_recv_pdu(conn->cls_conn, hdr, NULL, 0))
476 rc = ISCSI_ERR_CONN_FAILED;
477 break;
478 case ISCSI_OP_REJECT:
479 rc = iscsi_handle_reject(conn, hdr, data, datalen);
480 break;
481 case ISCSI_OP_ASYNC_EVENT:
482 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
483 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
484 rc = ISCSI_ERR_CONN_FAILED;
485 break;
486 default:
487 rc = ISCSI_ERR_BAD_OPCODE;
488 break;
489 }
490 } else
491 rc = ISCSI_ERR_BAD_ITT;
492
493 return rc;
494 }
495 EXPORT_SYMBOL_GPL(__iscsi_complete_pdu);
496
497 int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
498 char *data, int datalen)
499 {
500 int rc;
501
502 spin_lock(&conn->session->lock);
503 rc = __iscsi_complete_pdu(conn, hdr, data, datalen);
504 spin_unlock(&conn->session->lock);
505 return rc;
506 }
507 EXPORT_SYMBOL_GPL(iscsi_complete_pdu);
508
509 /* verify itt (itt encoding: age+cid+itt) */
510 int iscsi_verify_itt(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
511 uint32_t *ret_itt)
512 {
513 struct iscsi_session *session = conn->session;
514 struct iscsi_cmd_task *ctask;
515 uint32_t itt;
516
517 if (hdr->itt != RESERVED_ITT) {
518 if (((__force u32)hdr->itt & ISCSI_AGE_MASK) !=
519 (session->age << ISCSI_AGE_SHIFT)) {
520 printk(KERN_ERR "iscsi: received itt %x expected "
521 "session age (%x)\n", (__force u32)hdr->itt,
522 session->age & ISCSI_AGE_MASK);
523 return ISCSI_ERR_BAD_ITT;
524 }
525
526 if (((__force u32)hdr->itt & ISCSI_CID_MASK) !=
527 (conn->id << ISCSI_CID_SHIFT)) {
528 printk(KERN_ERR "iscsi: received itt %x, expected "
529 "CID (%x)\n", (__force u32)hdr->itt, conn->id);
530 return ISCSI_ERR_BAD_ITT;
531 }
532 itt = get_itt(hdr->itt);
533 } else
534 itt = ~0U;
535
536 if (itt < session->cmds_max) {
537 ctask = session->cmds[itt];
538
539 if (!ctask->sc) {
540 printk(KERN_INFO "iscsi: dropping ctask with "
541 "itt 0x%x\n", ctask->itt);
542 /* force drop */
543 return ISCSI_ERR_NO_SCSI_CMD;
544 }
545
546 if (ctask->sc->SCp.phase != session->age) {
547 printk(KERN_ERR "iscsi: ctask's session age %d, "
548 "expected %d\n", ctask->sc->SCp.phase,
549 session->age);
550 return ISCSI_ERR_SESSION_FAILED;
551 }
552 }
553
554 *ret_itt = itt;
555 return 0;
556 }
557 EXPORT_SYMBOL_GPL(iscsi_verify_itt);
558
559 void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
560 {
561 struct iscsi_session *session = conn->session;
562 unsigned long flags;
563
564 spin_lock_irqsave(&session->lock, flags);
565 if (session->state == ISCSI_STATE_FAILED) {
566 spin_unlock_irqrestore(&session->lock, flags);
567 return;
568 }
569
570 if (conn->stop_stage == 0)
571 session->state = ISCSI_STATE_FAILED;
572 spin_unlock_irqrestore(&session->lock, flags);
573 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
574 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
575 iscsi_conn_error(conn->cls_conn, err);
576 }
577 EXPORT_SYMBOL_GPL(iscsi_conn_failure);
578
579 static void iscsi_prep_mtask(struct iscsi_conn *conn,
580 struct iscsi_mgmt_task *mtask)
581 {
582 struct iscsi_session *session = conn->session;
583 struct iscsi_hdr *hdr = mtask->hdr;
584 struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
585
586 if (hdr->opcode != (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) &&
587 hdr->opcode != (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
588 nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
589 /*
590 * pre-format CmdSN for outgoing PDU.
591 */
592 nop->cmdsn = cpu_to_be32(session->cmdsn);
593 if (hdr->itt != RESERVED_ITT) {
594 hdr->itt = build_itt(mtask->itt, conn->id, session->age);
595 /*
596 * TODO: We always use immediate, so we never hit this.
597 * If we start to send tmfs or nops as non-immediate then
598 * we should start checking the cmdsn numbers for mgmt tasks.
599 */
600 if (conn->c_stage == ISCSI_CONN_STARTED &&
601 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
602 session->queued_cmdsn++;
603 session->cmdsn++;
604 }
605 }
606
607 if (session->tt->init_mgmt_task)
608 session->tt->init_mgmt_task(conn, mtask);
609
610 debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n",
611 hdr->opcode & ISCSI_OPCODE_MASK, hdr->itt,
612 mtask->data_count);
613 }
614
615 static int iscsi_xmit_mtask(struct iscsi_conn *conn)
616 {
617 struct iscsi_hdr *hdr = conn->mtask->hdr;
618 int rc, was_logout = 0;
619
620 spin_unlock_bh(&conn->session->lock);
621 if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT) {
622 conn->session->state = ISCSI_STATE_IN_RECOVERY;
623 iscsi_block_session(session_to_cls(conn->session));
624 was_logout = 1;
625 }
626 rc = conn->session->tt->xmit_mgmt_task(conn, conn->mtask);
627 spin_lock_bh(&conn->session->lock);
628 if (rc)
629 return rc;
630
631 /* done with this in-progress mtask */
632 conn->mtask = NULL;
633
634 if (was_logout) {
635 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
636 return -ENODATA;
637 }
638 return 0;
639 }
640
641 static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn)
642 {
643 struct iscsi_session *session = conn->session;
644
645 /*
646 * Check for iSCSI window and take care of CmdSN wrap-around
647 */
648 if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) {
649 debug_scsi("iSCSI CmdSN closed. ExpCmdSn %u MaxCmdSN %u "
650 "CmdSN %u/%u\n", session->exp_cmdsn,
651 session->max_cmdsn, session->cmdsn,
652 session->queued_cmdsn);
653 return -ENOSPC;
654 }
655 return 0;
656 }
657
658 static int iscsi_xmit_ctask(struct iscsi_conn *conn)
659 {
660 struct iscsi_cmd_task *ctask = conn->ctask;
661 int rc;
662
663 __iscsi_get_ctask(ctask);
664 spin_unlock_bh(&conn->session->lock);
665 rc = conn->session->tt->xmit_cmd_task(conn, ctask);
666 spin_lock_bh(&conn->session->lock);
667 __iscsi_put_ctask(ctask);
668 if (!rc)
669 /* done with this ctask */
670 conn->ctask = NULL;
671 return rc;
672 }
673
674 /**
675 * iscsi_requeue_ctask - requeue ctask to run from session workqueue
676 * @ctask: ctask to requeue
677 *
678 * LLDs that need to run a ctask from the session workqueue should call
679 * this. The session lock must be held.
680 */
681 void iscsi_requeue_ctask(struct iscsi_cmd_task *ctask)
682 {
683 struct iscsi_conn *conn = ctask->conn;
684
685 list_move_tail(&ctask->running, &conn->requeue);
686 scsi_queue_work(conn->session->host, &conn->xmitwork);
687 }
688 EXPORT_SYMBOL_GPL(iscsi_requeue_ctask);
689
690 /**
691 * iscsi_data_xmit - xmit any command into the scheduled connection
692 * @conn: iscsi connection
693 *
694 * Notes:
695 * The function can return -EAGAIN in which case the caller must
696 * re-schedule it again later or recover. '0' return code means
697 * successful xmit.
698 **/
699 static int iscsi_data_xmit(struct iscsi_conn *conn)
700 {
701 int rc = 0;
702
703 spin_lock_bh(&conn->session->lock);
704 if (unlikely(conn->suspend_tx)) {
705 debug_scsi("conn %d Tx suspended!\n", conn->id);
706 spin_unlock_bh(&conn->session->lock);
707 return -ENODATA;
708 }
709
710 if (conn->ctask) {
711 rc = iscsi_xmit_ctask(conn);
712 if (rc)
713 goto again;
714 }
715
716 if (conn->mtask) {
717 rc = iscsi_xmit_mtask(conn);
718 if (rc)
719 goto again;
720 }
721
722 /*
723 * process mgmt pdus like nops before commands since we should
724 * only have one nop-out as a ping from us and targets should not
725 * overflow us with nop-ins
726 */
727 check_mgmt:
728 while (!list_empty(&conn->mgmtqueue)) {
729 conn->mtask = list_entry(conn->mgmtqueue.next,
730 struct iscsi_mgmt_task, running);
731 iscsi_prep_mtask(conn, conn->mtask);
732 list_move_tail(conn->mgmtqueue.next, &conn->mgmt_run_list);
733 rc = iscsi_xmit_mtask(conn);
734 if (rc)
735 goto again;
736 }
737
738 /* process pending command queue */
739 while (!list_empty(&conn->xmitqueue)) {
740 if (conn->tmf_state == TMF_QUEUED)
741 break;
742
743 conn->ctask = list_entry(conn->xmitqueue.next,
744 struct iscsi_cmd_task, running);
745 iscsi_prep_scsi_cmd_pdu(conn->ctask);
746 conn->session->tt->init_cmd_task(conn->ctask);
747 conn->ctask->state = ISCSI_TASK_RUNNING;
748 list_move_tail(conn->xmitqueue.next, &conn->run_list);
749 rc = iscsi_xmit_ctask(conn);
750 if (rc)
751 goto again;
752 /*
753 * we could continuously get new ctask requests so
754 * we need to check the mgmt queue for nops that need to
755 * be sent to aviod starvation
756 */
757 if (!list_empty(&conn->mgmtqueue))
758 goto check_mgmt;
759 }
760
761 while (!list_empty(&conn->requeue)) {
762 if (conn->session->fast_abort && conn->tmf_state != TMF_INITIAL)
763 break;
764
765 conn->ctask = list_entry(conn->requeue.next,
766 struct iscsi_cmd_task, running);
767 conn->ctask->state = ISCSI_TASK_RUNNING;
768 list_move_tail(conn->requeue.next, &conn->run_list);
769 rc = iscsi_xmit_ctask(conn);
770 if (rc)
771 goto again;
772 if (!list_empty(&conn->mgmtqueue))
773 goto check_mgmt;
774 }
775 spin_unlock_bh(&conn->session->lock);
776 return -ENODATA;
777
778 again:
779 if (unlikely(conn->suspend_tx))
780 rc = -ENODATA;
781 spin_unlock_bh(&conn->session->lock);
782 return rc;
783 }
784
785 static void iscsi_xmitworker(struct work_struct *work)
786 {
787 struct iscsi_conn *conn =
788 container_of(work, struct iscsi_conn, xmitwork);
789 int rc;
790 /*
791 * serialize Xmit worker on a per-connection basis.
792 */
793 do {
794 rc = iscsi_data_xmit(conn);
795 } while (rc >= 0 || rc == -EAGAIN);
796 }
797
798 enum {
799 FAILURE_BAD_HOST = 1,
800 FAILURE_SESSION_FAILED,
801 FAILURE_SESSION_FREED,
802 FAILURE_WINDOW_CLOSED,
803 FAILURE_OOM,
804 FAILURE_SESSION_TERMINATE,
805 FAILURE_SESSION_IN_RECOVERY,
806 FAILURE_SESSION_RECOVERY_TIMEOUT,
807 };
808
809 int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
810 {
811 struct Scsi_Host *host;
812 int reason = 0;
813 struct iscsi_session *session;
814 struct iscsi_conn *conn;
815 struct iscsi_cmd_task *ctask = NULL;
816
817 sc->scsi_done = done;
818 sc->result = 0;
819 sc->SCp.ptr = NULL;
820
821 host = sc->device->host;
822 session = iscsi_hostdata(host->hostdata);
823
824 spin_lock(&session->lock);
825
826 /*
827 * ISCSI_STATE_FAILED is a temp. state. The recovery
828 * code will decide what is best to do with command queued
829 * during this time
830 */
831 if (session->state != ISCSI_STATE_LOGGED_IN &&
832 session->state != ISCSI_STATE_FAILED) {
833 /*
834 * to handle the race between when we set the recovery state
835 * and block the session we requeue here (commands could
836 * be entering our queuecommand while a block is starting
837 * up because the block code is not locked)
838 */
839 if (session->state == ISCSI_STATE_IN_RECOVERY) {
840 reason = FAILURE_SESSION_IN_RECOVERY;
841 goto reject;
842 }
843
844 if (session->state == ISCSI_STATE_RECOVERY_FAILED)
845 reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
846 else if (session->state == ISCSI_STATE_TERMINATE)
847 reason = FAILURE_SESSION_TERMINATE;
848 else
849 reason = FAILURE_SESSION_FREED;
850 goto fault;
851 }
852
853 conn = session->leadconn;
854 if (!conn) {
855 reason = FAILURE_SESSION_FREED;
856 goto fault;
857 }
858
859 if (iscsi_check_cmdsn_window_closed(conn)) {
860 reason = FAILURE_WINDOW_CLOSED;
861 goto reject;
862 }
863
864 if (!__kfifo_get(session->cmdpool.queue, (void*)&ctask,
865 sizeof(void*))) {
866 reason = FAILURE_OOM;
867 goto reject;
868 }
869 session->queued_cmdsn++;
870
871 sc->SCp.phase = session->age;
872 sc->SCp.ptr = (char *)ctask;
873
874 atomic_set(&ctask->refcount, 1);
875 ctask->state = ISCSI_TASK_PENDING;
876 ctask->conn = conn;
877 ctask->sc = sc;
878 INIT_LIST_HEAD(&ctask->running);
879
880 list_add_tail(&ctask->running, &conn->xmitqueue);
881 spin_unlock(&session->lock);
882
883 scsi_queue_work(host, &conn->xmitwork);
884 return 0;
885
886 reject:
887 spin_unlock(&session->lock);
888 debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason);
889 return SCSI_MLQUEUE_HOST_BUSY;
890
891 fault:
892 spin_unlock(&session->lock);
893 printk(KERN_ERR "iscsi: cmd 0x%x is not queued (%d)\n",
894 sc->cmnd[0], reason);
895 sc->result = (DID_NO_CONNECT << 16);
896 scsi_set_resid(sc, scsi_bufflen(sc));
897 sc->scsi_done(sc);
898 return 0;
899 }
900 EXPORT_SYMBOL_GPL(iscsi_queuecommand);
901
902 int iscsi_change_queue_depth(struct scsi_device *sdev, int depth)
903 {
904 if (depth > ISCSI_MAX_CMD_PER_LUN)
905 depth = ISCSI_MAX_CMD_PER_LUN;
906 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
907 return sdev->queue_depth;
908 }
909 EXPORT_SYMBOL_GPL(iscsi_change_queue_depth);
910
911 static struct iscsi_mgmt_task *
912 __iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
913 char *data, uint32_t data_size)
914 {
915 struct iscsi_session *session = conn->session;
916 struct iscsi_mgmt_task *mtask;
917
918 if (session->state == ISCSI_STATE_TERMINATE)
919 return NULL;
920
921 if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) ||
922 hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
923 /*
924 * Login and Text are sent serially, in
925 * request-followed-by-response sequence.
926 * Same mtask can be used. Same ITT must be used.
927 * Note that login_mtask is preallocated at conn_create().
928 */
929 mtask = conn->login_mtask;
930 else {
931 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
932 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
933
934 if (!__kfifo_get(session->mgmtpool.queue,
935 (void*)&mtask, sizeof(void*)))
936 return NULL;
937 }
938
939 if (data_size) {
940 memcpy(mtask->data, data, data_size);
941 mtask->data_count = data_size;
942 } else
943 mtask->data_count = 0;
944
945 memcpy(mtask->hdr, hdr, sizeof(struct iscsi_hdr));
946 INIT_LIST_HEAD(&mtask->running);
947 list_add_tail(&mtask->running, &conn->mgmtqueue);
948 return mtask;
949 }
950
951 int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr,
952 char *data, uint32_t data_size)
953 {
954 struct iscsi_conn *conn = cls_conn->dd_data;
955 struct iscsi_session *session = conn->session;
956 int err = 0;
957
958 spin_lock_bh(&session->lock);
959 if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size))
960 err = -EPERM;
961 spin_unlock_bh(&session->lock);
962 scsi_queue_work(session->host, &conn->xmitwork);
963 return err;
964 }
965 EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu);
966
967 void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
968 {
969 struct iscsi_session *session = class_to_transport_session(cls_session);
970
971 spin_lock_bh(&session->lock);
972 if (session->state != ISCSI_STATE_LOGGED_IN) {
973 session->state = ISCSI_STATE_RECOVERY_FAILED;
974 if (session->leadconn)
975 wake_up(&session->leadconn->ehwait);
976 }
977 spin_unlock_bh(&session->lock);
978 }
979 EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
980
981 int iscsi_eh_host_reset(struct scsi_cmnd *sc)
982 {
983 struct Scsi_Host *host = sc->device->host;
984 struct iscsi_session *session = iscsi_hostdata(host->hostdata);
985 struct iscsi_conn *conn = session->leadconn;
986
987 spin_lock_bh(&session->lock);
988 if (session->state == ISCSI_STATE_TERMINATE) {
989 failed:
990 debug_scsi("failing host reset: session terminated "
991 "[CID %d age %d]\n", conn->id, session->age);
992 spin_unlock_bh(&session->lock);
993 return FAILED;
994 }
995
996 spin_unlock_bh(&session->lock);
997
998 /*
999 * we drop the lock here but the leadconn cannot be destoyed while
1000 * we are in the scsi eh
1001 */
1002 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1003
1004 debug_scsi("iscsi_eh_host_reset wait for relogin\n");
1005 wait_event_interruptible(conn->ehwait,
1006 session->state == ISCSI_STATE_TERMINATE ||
1007 session->state == ISCSI_STATE_LOGGED_IN ||
1008 session->state == ISCSI_STATE_RECOVERY_FAILED);
1009 if (signal_pending(current))
1010 flush_signals(current);
1011
1012 spin_lock_bh(&session->lock);
1013 if (session->state == ISCSI_STATE_LOGGED_IN)
1014 printk(KERN_INFO "iscsi: host reset succeeded\n");
1015 else
1016 goto failed;
1017 spin_unlock_bh(&session->lock);
1018
1019 return SUCCESS;
1020 }
1021 EXPORT_SYMBOL_GPL(iscsi_eh_host_reset);
1022
1023 static void iscsi_tmf_timedout(unsigned long data)
1024 {
1025 struct iscsi_conn *conn = (struct iscsi_conn *)data;
1026 struct iscsi_session *session = conn->session;
1027
1028 spin_lock(&session->lock);
1029 if (conn->tmf_state == TMF_QUEUED) {
1030 conn->tmf_state = TMF_TIMEDOUT;
1031 debug_scsi("tmf timedout\n");
1032 /* unblock eh_abort() */
1033 wake_up(&conn->ehwait);
1034 }
1035 spin_unlock(&session->lock);
1036 }
1037
1038 static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn,
1039 struct iscsi_tm *hdr, int age)
1040 {
1041 struct iscsi_session *session = conn->session;
1042 struct iscsi_mgmt_task *mtask;
1043
1044 mtask = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr,
1045 NULL, 0);
1046 if (!mtask) {
1047 spin_unlock_bh(&session->lock);
1048 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1049 spin_lock_bh(&session->lock);
1050 debug_scsi("tmf exec failure\n");
1051 return -EPERM;
1052 }
1053 conn->tmfcmd_pdus_cnt++;
1054 conn->tmf_timer.expires = 30 * HZ + jiffies;
1055 conn->tmf_timer.function = iscsi_tmf_timedout;
1056 conn->tmf_timer.data = (unsigned long)conn;
1057 add_timer(&conn->tmf_timer);
1058 debug_scsi("tmf set timeout\n");
1059
1060 spin_unlock_bh(&session->lock);
1061 mutex_unlock(&session->eh_mutex);
1062 scsi_queue_work(session->host, &conn->xmitwork);
1063
1064 /*
1065 * block eh thread until:
1066 *
1067 * 1) tmf response
1068 * 2) tmf timeout
1069 * 3) session is terminated or restarted or userspace has
1070 * given up on recovery
1071 */
1072 wait_event_interruptible(conn->ehwait, age != session->age ||
1073 session->state != ISCSI_STATE_LOGGED_IN ||
1074 conn->tmf_state != TMF_QUEUED);
1075 if (signal_pending(current))
1076 flush_signals(current);
1077 del_timer_sync(&conn->tmf_timer);
1078
1079 mutex_lock(&session->eh_mutex);
1080 spin_lock_bh(&session->lock);
1081 /* if the session drops it will clean up the mtask */
1082 if (age != session->age ||
1083 session->state != ISCSI_STATE_LOGGED_IN)
1084 return -ENOTCONN;
1085
1086 if (!list_empty(&mtask->running)) {
1087 list_del_init(&mtask->running);
1088 __kfifo_put(session->mgmtpool.queue, (void*)&mtask,
1089 sizeof(void*));
1090 }
1091 return 0;
1092 }
1093
1094 /*
1095 * session lock must be held
1096 */
1097 static void fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
1098 int err)
1099 {
1100 struct scsi_cmnd *sc;
1101
1102 sc = ctask->sc;
1103 if (!sc)
1104 return;
1105
1106 if (ctask->state == ISCSI_TASK_PENDING)
1107 /*
1108 * cmd never made it to the xmit thread, so we should not count
1109 * the cmd in the sequencing
1110 */
1111 conn->session->queued_cmdsn--;
1112 else
1113 conn->session->tt->cleanup_cmd_task(conn, ctask);
1114
1115 sc->result = err;
1116 scsi_set_resid(sc, scsi_bufflen(sc));
1117 if (conn->ctask == ctask)
1118 conn->ctask = NULL;
1119 /* release ref from queuecommand */
1120 __iscsi_put_ctask(ctask);
1121 }
1122
1123 /*
1124 * Fail commands. session lock held and recv side suspended and xmit
1125 * thread flushed
1126 */
1127 static void fail_all_commands(struct iscsi_conn *conn, unsigned lun)
1128 {
1129 struct iscsi_cmd_task *ctask, *tmp;
1130
1131 if (conn->ctask && (conn->ctask->sc->device->lun == lun || lun == -1))
1132 conn->ctask = NULL;
1133
1134 /* flush pending */
1135 list_for_each_entry_safe(ctask, tmp, &conn->xmitqueue, running) {
1136 if (lun == ctask->sc->device->lun || lun == -1) {
1137 debug_scsi("failing pending sc %p itt 0x%x\n",
1138 ctask->sc, ctask->itt);
1139 fail_command(conn, ctask, DID_BUS_BUSY << 16);
1140 }
1141 }
1142
1143 list_for_each_entry_safe(ctask, tmp, &conn->requeue, running) {
1144 if (lun == ctask->sc->device->lun || lun == -1) {
1145 debug_scsi("failing requeued sc %p itt 0x%x\n",
1146 ctask->sc, ctask->itt);
1147 fail_command(conn, ctask, DID_BUS_BUSY << 16);
1148 }
1149 }
1150
1151 /* fail all other running */
1152 list_for_each_entry_safe(ctask, tmp, &conn->run_list, running) {
1153 if (lun == ctask->sc->device->lun || lun == -1) {
1154 debug_scsi("failing in progress sc %p itt 0x%x\n",
1155 ctask->sc, ctask->itt);
1156 fail_command(conn, ctask, DID_BUS_BUSY << 16);
1157 }
1158 }
1159 }
1160
1161 static void iscsi_suspend_tx(struct iscsi_conn *conn)
1162 {
1163 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1164 scsi_flush_work(conn->session->host);
1165 }
1166
1167 static void iscsi_start_tx(struct iscsi_conn *conn)
1168 {
1169 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1170 scsi_queue_work(conn->session->host, &conn->xmitwork);
1171 }
1172
1173 static void iscsi_prep_abort_task_pdu(struct iscsi_cmd_task *ctask,
1174 struct iscsi_tm *hdr)
1175 {
1176 memset(hdr, 0, sizeof(*hdr));
1177 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
1178 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK;
1179 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
1180 memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
1181 hdr->rtt = ctask->hdr->itt;
1182 hdr->refcmdsn = ctask->hdr->cmdsn;
1183 }
1184
1185 int iscsi_eh_abort(struct scsi_cmnd *sc)
1186 {
1187 struct Scsi_Host *host = sc->device->host;
1188 struct iscsi_session *session = iscsi_hostdata(host->hostdata);
1189 struct iscsi_conn *conn;
1190 struct iscsi_cmd_task *ctask;
1191 struct iscsi_tm *hdr;
1192 int rc, age;
1193
1194 mutex_lock(&session->eh_mutex);
1195 spin_lock_bh(&session->lock);
1196 /*
1197 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
1198 * got the command.
1199 */
1200 if (!sc->SCp.ptr) {
1201 debug_scsi("sc never reached iscsi layer or it completed.\n");
1202 spin_unlock_bh(&session->lock);
1203 mutex_unlock(&session->eh_mutex);
1204 return SUCCESS;
1205 }
1206
1207 /*
1208 * If we are not logged in or we have started a new session
1209 * then let the host reset code handle this
1210 */
1211 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN ||
1212 sc->SCp.phase != session->age) {
1213 spin_unlock_bh(&session->lock);
1214 mutex_unlock(&session->eh_mutex);
1215 return FAILED;
1216 }
1217
1218 conn = session->leadconn;
1219 conn->eh_abort_cnt++;
1220 age = session->age;
1221
1222 ctask = (struct iscsi_cmd_task *)sc->SCp.ptr;
1223 debug_scsi("aborting [sc %p itt 0x%x]\n", sc, ctask->itt);
1224
1225 /* ctask completed before time out */
1226 if (!ctask->sc) {
1227 debug_scsi("sc completed while abort in progress\n");
1228 goto success;
1229 }
1230
1231 if (ctask->state == ISCSI_TASK_PENDING) {
1232 fail_command(conn, ctask, DID_ABORT << 16);
1233 goto success;
1234 }
1235
1236 /* only have one tmf outstanding at a time */
1237 if (conn->tmf_state != TMF_INITIAL)
1238 goto failed;
1239 conn->tmf_state = TMF_QUEUED;
1240
1241 hdr = &conn->tmhdr;
1242 iscsi_prep_abort_task_pdu(ctask, hdr);
1243
1244 if (iscsi_exec_task_mgmt_fn(conn, hdr, age)) {
1245 rc = FAILED;
1246 goto failed;
1247 }
1248
1249 switch (conn->tmf_state) {
1250 case TMF_SUCCESS:
1251 spin_unlock_bh(&session->lock);
1252 iscsi_suspend_tx(conn);
1253 /*
1254 * clean up task if aborted. grab the recv lock as a writer
1255 */
1256 write_lock_bh(conn->recv_lock);
1257 spin_lock(&session->lock);
1258 fail_command(conn, ctask, DID_ABORT << 16);
1259 conn->tmf_state = TMF_INITIAL;
1260 spin_unlock(&session->lock);
1261 write_unlock_bh(conn->recv_lock);
1262 iscsi_start_tx(conn);
1263 goto success_unlocked;
1264 case TMF_TIMEDOUT:
1265 spin_unlock_bh(&session->lock);
1266 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1267 goto failed_unlocked;
1268 case TMF_NOT_FOUND:
1269 if (!sc->SCp.ptr) {
1270 conn->tmf_state = TMF_INITIAL;
1271 /* ctask completed before tmf abort response */
1272 debug_scsi("sc completed while abort in progress\n");
1273 goto success;
1274 }
1275 /* fall through */
1276 default:
1277 conn->tmf_state = TMF_INITIAL;
1278 goto failed;
1279 }
1280
1281 success:
1282 spin_unlock_bh(&session->lock);
1283 success_unlocked:
1284 debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
1285 mutex_unlock(&session->eh_mutex);
1286 return SUCCESS;
1287
1288 failed:
1289 spin_unlock_bh(&session->lock);
1290 failed_unlocked:
1291 debug_scsi("abort failed [sc %p itt 0x%x]\n", sc,
1292 ctask ? ctask->itt : 0);
1293 mutex_unlock(&session->eh_mutex);
1294 return FAILED;
1295 }
1296 EXPORT_SYMBOL_GPL(iscsi_eh_abort);
1297
1298 static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
1299 {
1300 memset(hdr, 0, sizeof(*hdr));
1301 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
1302 hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK;
1303 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
1304 int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun);
1305 hdr->rtt = ISCSI_RESERVED_TAG;
1306 }
1307
1308 int iscsi_eh_device_reset(struct scsi_cmnd *sc)
1309 {
1310 struct Scsi_Host *host = sc->device->host;
1311 struct iscsi_session *session = iscsi_hostdata(host->hostdata);
1312 struct iscsi_conn *conn;
1313 struct iscsi_tm *hdr;
1314 int rc = FAILED;
1315
1316 debug_scsi("LU Reset [sc %p lun %u]\n", sc, sc->device->lun);
1317
1318 mutex_lock(&session->eh_mutex);
1319 spin_lock_bh(&session->lock);
1320 /*
1321 * Just check if we are not logged in. We cannot check for
1322 * the phase because the reset could come from a ioctl.
1323 */
1324 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
1325 goto unlock;
1326 conn = session->leadconn;
1327
1328 /* only have one tmf outstanding at a time */
1329 if (conn->tmf_state != TMF_INITIAL)
1330 goto unlock;
1331 conn->tmf_state = TMF_QUEUED;
1332
1333 hdr = &conn->tmhdr;
1334 iscsi_prep_lun_reset_pdu(sc, hdr);
1335
1336 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age)) {
1337 rc = FAILED;
1338 goto unlock;
1339 }
1340
1341 switch (conn->tmf_state) {
1342 case TMF_SUCCESS:
1343 break;
1344 case TMF_TIMEDOUT:
1345 spin_unlock_bh(&session->lock);
1346 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1347 goto done;
1348 default:
1349 conn->tmf_state = TMF_INITIAL;
1350 goto unlock;
1351 }
1352
1353 rc = SUCCESS;
1354 spin_unlock_bh(&session->lock);
1355
1356 iscsi_suspend_tx(conn);
1357 /* need to grab the recv lock then session lock */
1358 write_lock_bh(conn->recv_lock);
1359 spin_lock(&session->lock);
1360 fail_all_commands(conn, sc->device->lun);
1361 conn->tmf_state = TMF_INITIAL;
1362 spin_unlock(&session->lock);
1363 write_unlock_bh(conn->recv_lock);
1364
1365 iscsi_start_tx(conn);
1366 goto done;
1367
1368 unlock:
1369 spin_unlock_bh(&session->lock);
1370 done:
1371 debug_scsi("iscsi_eh_device_reset %s\n",
1372 rc == SUCCESS ? "SUCCESS" : "FAILED");
1373 mutex_unlock(&session->eh_mutex);
1374 return rc;
1375 }
1376 EXPORT_SYMBOL_GPL(iscsi_eh_device_reset);
1377
1378 int
1379 iscsi_pool_init(struct iscsi_queue *q, int max, void ***items, int item_size)
1380 {
1381 int i;
1382
1383 *items = kmalloc(max * sizeof(void*), GFP_KERNEL);
1384 if (*items == NULL)
1385 return -ENOMEM;
1386
1387 q->max = max;
1388 q->pool = kmalloc(max * sizeof(void*), GFP_KERNEL);
1389 if (q->pool == NULL) {
1390 kfree(*items);
1391 return -ENOMEM;
1392 }
1393
1394 q->queue = kfifo_init((void*)q->pool, max * sizeof(void*),
1395 GFP_KERNEL, NULL);
1396 if (q->queue == ERR_PTR(-ENOMEM)) {
1397 kfree(q->pool);
1398 kfree(*items);
1399 return -ENOMEM;
1400 }
1401
1402 for (i = 0; i < max; i++) {
1403 q->pool[i] = kmalloc(item_size, GFP_KERNEL);
1404 if (q->pool[i] == NULL) {
1405 int j;
1406
1407 for (j = 0; j < i; j++)
1408 kfree(q->pool[j]);
1409
1410 kfifo_free(q->queue);
1411 kfree(q->pool);
1412 kfree(*items);
1413 return -ENOMEM;
1414 }
1415 memset(q->pool[i], 0, item_size);
1416 (*items)[i] = q->pool[i];
1417 __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*));
1418 }
1419 return 0;
1420 }
1421 EXPORT_SYMBOL_GPL(iscsi_pool_init);
1422
1423 void iscsi_pool_free(struct iscsi_queue *q, void **items)
1424 {
1425 int i;
1426
1427 for (i = 0; i < q->max; i++)
1428 kfree(items[i]);
1429 kfree(q->pool);
1430 kfree(items);
1431 }
1432 EXPORT_SYMBOL_GPL(iscsi_pool_free);
1433
1434 /*
1435 * iSCSI Session's hostdata organization:
1436 *
1437 * *------------------* <== hostdata_session(host->hostdata)
1438 * | ptr to class sess|
1439 * |------------------| <== iscsi_hostdata(host->hostdata)
1440 * | iscsi_session |
1441 * *------------------*
1442 */
1443
1444 #define hostdata_privsize(_sz) (sizeof(unsigned long) + _sz + \
1445 _sz % sizeof(unsigned long))
1446
1447 #define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata))
1448
1449 /**
1450 * iscsi_session_setup - create iscsi cls session and host and session
1451 * @scsit: scsi transport template
1452 * @iscsit: iscsi transport template
1453 * @cmds_max: scsi host can queue
1454 * @qdepth: scsi host cmds per lun
1455 * @cmd_task_size: LLD ctask private data size
1456 * @mgmt_task_size: LLD mtask private data size
1457 * @initial_cmdsn: initial CmdSN
1458 * @hostno: host no allocated
1459 *
1460 * This can be used by software iscsi_transports that allocate
1461 * a session per scsi host.
1462 **/
1463 struct iscsi_cls_session *
1464 iscsi_session_setup(struct iscsi_transport *iscsit,
1465 struct scsi_transport_template *scsit,
1466 uint16_t cmds_max, uint16_t qdepth,
1467 int cmd_task_size, int mgmt_task_size,
1468 uint32_t initial_cmdsn, uint32_t *hostno)
1469 {
1470 struct Scsi_Host *shost;
1471 struct iscsi_session *session;
1472 struct iscsi_cls_session *cls_session;
1473 int cmd_i;
1474
1475 if (qdepth > ISCSI_MAX_CMD_PER_LUN || qdepth < 1) {
1476 if (qdepth != 0)
1477 printk(KERN_ERR "iscsi: invalid queue depth of %d. "
1478 "Queue depth must be between 1 and %d.\n",
1479 qdepth, ISCSI_MAX_CMD_PER_LUN);
1480 qdepth = ISCSI_DEF_CMD_PER_LUN;
1481 }
1482
1483 if (cmds_max < 2 || (cmds_max & (cmds_max - 1)) ||
1484 cmds_max >= ISCSI_MGMT_ITT_OFFSET) {
1485 if (cmds_max != 0)
1486 printk(KERN_ERR "iscsi: invalid can_queue of %d. "
1487 "can_queue must be a power of 2 and between "
1488 "2 and %d - setting to %d.\n", cmds_max,
1489 ISCSI_MGMT_ITT_OFFSET, ISCSI_DEF_XMIT_CMDS_MAX);
1490 cmds_max = ISCSI_DEF_XMIT_CMDS_MAX;
1491 }
1492
1493 shost = scsi_host_alloc(iscsit->host_template,
1494 hostdata_privsize(sizeof(*session)));
1495 if (!shost)
1496 return NULL;
1497
1498 /* the iscsi layer takes one task for reserve */
1499 shost->can_queue = cmds_max - 1;
1500 shost->cmd_per_lun = qdepth;
1501 shost->max_id = 1;
1502 shost->max_channel = 0;
1503 shost->max_lun = iscsit->max_lun;
1504 shost->max_cmd_len = iscsit->max_cmd_len;
1505 shost->transportt = scsit;
1506 shost->transportt->create_work_queue = 1;
1507 *hostno = shost->host_no;
1508
1509 session = iscsi_hostdata(shost->hostdata);
1510 memset(session, 0, sizeof(struct iscsi_session));
1511 session->host = shost;
1512 session->state = ISCSI_STATE_FREE;
1513 session->mgmtpool_max = ISCSI_MGMT_CMDS_MAX;
1514 session->cmds_max = cmds_max;
1515 session->queued_cmdsn = session->cmdsn = initial_cmdsn;
1516 session->exp_cmdsn = initial_cmdsn + 1;
1517 session->max_cmdsn = initial_cmdsn + 1;
1518 session->max_r2t = 1;
1519 session->tt = iscsit;
1520 mutex_init(&session->eh_mutex);
1521
1522 /* initialize SCSI PDU commands pool */
1523 if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
1524 (void***)&session->cmds,
1525 cmd_task_size + sizeof(struct iscsi_cmd_task)))
1526 goto cmdpool_alloc_fail;
1527
1528 /* pre-format cmds pool with ITT */
1529 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
1530 struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
1531
1532 if (cmd_task_size)
1533 ctask->dd_data = &ctask[1];
1534 ctask->itt = cmd_i;
1535 INIT_LIST_HEAD(&ctask->running);
1536 }
1537
1538 spin_lock_init(&session->lock);
1539
1540 /* initialize immediate command pool */
1541 if (iscsi_pool_init(&session->mgmtpool, session->mgmtpool_max,
1542 (void***)&session->mgmt_cmds,
1543 mgmt_task_size + sizeof(struct iscsi_mgmt_task)))
1544 goto mgmtpool_alloc_fail;
1545
1546
1547 /* pre-format immediate cmds pool with ITT */
1548 for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) {
1549 struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i];
1550
1551 if (mgmt_task_size)
1552 mtask->dd_data = &mtask[1];
1553 mtask->itt = ISCSI_MGMT_ITT_OFFSET + cmd_i;
1554 INIT_LIST_HEAD(&mtask->running);
1555 }
1556
1557 if (scsi_add_host(shost, NULL))
1558 goto add_host_fail;
1559
1560 if (!try_module_get(iscsit->owner))
1561 goto cls_session_fail;
1562
1563 cls_session = iscsi_create_session(shost, iscsit, 0);
1564 if (!cls_session)
1565 goto module_put;
1566 *(unsigned long*)shost->hostdata = (unsigned long)cls_session;
1567
1568 return cls_session;
1569
1570 module_put:
1571 module_put(iscsit->owner);
1572 cls_session_fail:
1573 scsi_remove_host(shost);
1574 add_host_fail:
1575 iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
1576 mgmtpool_alloc_fail:
1577 iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
1578 cmdpool_alloc_fail:
1579 scsi_host_put(shost);
1580 return NULL;
1581 }
1582 EXPORT_SYMBOL_GPL(iscsi_session_setup);
1583
1584 /**
1585 * iscsi_session_teardown - destroy session, host, and cls_session
1586 * shost: scsi host
1587 *
1588 * This can be used by software iscsi_transports that allocate
1589 * a session per scsi host.
1590 **/
1591 void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
1592 {
1593 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
1594 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
1595 struct module *owner = cls_session->transport->owner;
1596
1597 iscsi_unblock_session(cls_session);
1598 scsi_remove_host(shost);
1599
1600 iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
1601 iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
1602
1603 kfree(session->password);
1604 kfree(session->password_in);
1605 kfree(session->username);
1606 kfree(session->username_in);
1607 kfree(session->targetname);
1608 kfree(session->netdev);
1609 kfree(session->hwaddress);
1610 kfree(session->initiatorname);
1611
1612 iscsi_destroy_session(cls_session);
1613 scsi_host_put(shost);
1614 module_put(owner);
1615 }
1616 EXPORT_SYMBOL_GPL(iscsi_session_teardown);
1617
1618 /**
1619 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
1620 * @cls_session: iscsi_cls_session
1621 * @conn_idx: cid
1622 **/
1623 struct iscsi_cls_conn *
1624 iscsi_conn_setup(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
1625 {
1626 struct iscsi_session *session = class_to_transport_session(cls_session);
1627 struct iscsi_conn *conn;
1628 struct iscsi_cls_conn *cls_conn;
1629 char *data;
1630
1631 cls_conn = iscsi_create_conn(cls_session, conn_idx);
1632 if (!cls_conn)
1633 return NULL;
1634 conn = cls_conn->dd_data;
1635 memset(conn, 0, sizeof(*conn));
1636
1637 conn->session = session;
1638 conn->cls_conn = cls_conn;
1639 conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
1640 conn->id = conn_idx;
1641 conn->exp_statsn = 0;
1642 conn->tmf_state = TMF_INITIAL;
1643 INIT_LIST_HEAD(&conn->run_list);
1644 INIT_LIST_HEAD(&conn->mgmt_run_list);
1645 INIT_LIST_HEAD(&conn->mgmtqueue);
1646 INIT_LIST_HEAD(&conn->xmitqueue);
1647 INIT_LIST_HEAD(&conn->requeue);
1648 INIT_WORK(&conn->xmitwork, iscsi_xmitworker);
1649
1650 /* allocate login_mtask used for the login/text sequences */
1651 spin_lock_bh(&session->lock);
1652 if (!__kfifo_get(session->mgmtpool.queue,
1653 (void*)&conn->login_mtask,
1654 sizeof(void*))) {
1655 spin_unlock_bh(&session->lock);
1656 goto login_mtask_alloc_fail;
1657 }
1658 spin_unlock_bh(&session->lock);
1659
1660 data = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN, GFP_KERNEL);
1661 if (!data)
1662 goto login_mtask_data_alloc_fail;
1663 conn->login_mtask->data = conn->data = data;
1664
1665 init_timer(&conn->tmf_timer);
1666 init_waitqueue_head(&conn->ehwait);
1667
1668 return cls_conn;
1669
1670 login_mtask_data_alloc_fail:
1671 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
1672 sizeof(void*));
1673 login_mtask_alloc_fail:
1674 iscsi_destroy_conn(cls_conn);
1675 return NULL;
1676 }
1677 EXPORT_SYMBOL_GPL(iscsi_conn_setup);
1678
1679 /**
1680 * iscsi_conn_teardown - teardown iscsi connection
1681 * cls_conn: iscsi class connection
1682 *
1683 * TODO: we may need to make this into a two step process
1684 * like scsi-mls remove + put host
1685 */
1686 void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
1687 {
1688 struct iscsi_conn *conn = cls_conn->dd_data;
1689 struct iscsi_session *session = conn->session;
1690 unsigned long flags;
1691
1692 spin_lock_bh(&session->lock);
1693 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
1694 if (session->leadconn == conn) {
1695 /*
1696 * leading connection? then give up on recovery.
1697 */
1698 session->state = ISCSI_STATE_TERMINATE;
1699 wake_up(&conn->ehwait);
1700 }
1701 spin_unlock_bh(&session->lock);
1702
1703 /*
1704 * Block until all in-progress commands for this connection
1705 * time out or fail.
1706 */
1707 for (;;) {
1708 spin_lock_irqsave(session->host->host_lock, flags);
1709 if (!session->host->host_busy) { /* OK for ERL == 0 */
1710 spin_unlock_irqrestore(session->host->host_lock, flags);
1711 break;
1712 }
1713 spin_unlock_irqrestore(session->host->host_lock, flags);
1714 msleep_interruptible(500);
1715 printk(KERN_INFO "iscsi: scsi conn_destroy(): host_busy %d "
1716 "host_failed %d\n", session->host->host_busy,
1717 session->host->host_failed);
1718 /*
1719 * force eh_abort() to unblock
1720 */
1721 wake_up(&conn->ehwait);
1722 }
1723
1724 /* flush queued up work because we free the connection below */
1725 iscsi_suspend_tx(conn);
1726
1727 spin_lock_bh(&session->lock);
1728 kfree(conn->data);
1729 kfree(conn->persistent_address);
1730 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
1731 sizeof(void*));
1732 if (session->leadconn == conn)
1733 session->leadconn = NULL;
1734 spin_unlock_bh(&session->lock);
1735
1736 iscsi_destroy_conn(cls_conn);
1737 }
1738 EXPORT_SYMBOL_GPL(iscsi_conn_teardown);
1739
1740 int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
1741 {
1742 struct iscsi_conn *conn = cls_conn->dd_data;
1743 struct iscsi_session *session = conn->session;
1744
1745 if (!session) {
1746 printk(KERN_ERR "iscsi: can't start unbound connection\n");
1747 return -EPERM;
1748 }
1749
1750 if ((session->imm_data_en || !session->initial_r2t_en) &&
1751 session->first_burst > session->max_burst) {
1752 printk("iscsi: invalid burst lengths: "
1753 "first_burst %d max_burst %d\n",
1754 session->first_burst, session->max_burst);
1755 return -EINVAL;
1756 }
1757
1758 spin_lock_bh(&session->lock);
1759 conn->c_stage = ISCSI_CONN_STARTED;
1760 session->state = ISCSI_STATE_LOGGED_IN;
1761 session->queued_cmdsn = session->cmdsn;
1762
1763 switch(conn->stop_stage) {
1764 case STOP_CONN_RECOVER:
1765 /*
1766 * unblock eh_abort() if it is blocked. re-try all
1767 * commands after successful recovery
1768 */
1769 conn->stop_stage = 0;
1770 conn->tmf_state = TMF_INITIAL;
1771 session->age++;
1772 spin_unlock_bh(&session->lock);
1773
1774 iscsi_unblock_session(session_to_cls(session));
1775 wake_up(&conn->ehwait);
1776 return 0;
1777 case STOP_CONN_TERM:
1778 conn->stop_stage = 0;
1779 break;
1780 default:
1781 break;
1782 }
1783 spin_unlock_bh(&session->lock);
1784
1785 return 0;
1786 }
1787 EXPORT_SYMBOL_GPL(iscsi_conn_start);
1788
1789 static void
1790 flush_control_queues(struct iscsi_session *session, struct iscsi_conn *conn)
1791 {
1792 struct iscsi_mgmt_task *mtask, *tmp;
1793
1794 /* handle pending */
1795 list_for_each_entry_safe(mtask, tmp, &conn->mgmtqueue, running) {
1796 debug_scsi("flushing pending mgmt task itt 0x%x\n", mtask->itt);
1797 list_del_init(&mtask->running);
1798 if (mtask == conn->login_mtask)
1799 continue;
1800 __kfifo_put(session->mgmtpool.queue, (void*)&mtask,
1801 sizeof(void*));
1802 }
1803
1804 /* handle running */
1805 list_for_each_entry_safe(mtask, tmp, &conn->mgmt_run_list, running) {
1806 debug_scsi("flushing running mgmt task itt 0x%x\n", mtask->itt);
1807 list_del_init(&mtask->running);
1808
1809 if (mtask == conn->login_mtask)
1810 continue;
1811 __kfifo_put(session->mgmtpool.queue, (void*)&mtask,
1812 sizeof(void*));
1813 }
1814
1815 conn->mtask = NULL;
1816 }
1817
1818 static void iscsi_start_session_recovery(struct iscsi_session *session,
1819 struct iscsi_conn *conn, int flag)
1820 {
1821 int old_stop_stage;
1822
1823 mutex_lock(&session->eh_mutex);
1824 spin_lock_bh(&session->lock);
1825 if (conn->stop_stage == STOP_CONN_TERM) {
1826 spin_unlock_bh(&session->lock);
1827 mutex_unlock(&session->eh_mutex);
1828 return;
1829 }
1830
1831 /*
1832 * The LLD either freed/unset the lock on us, or userspace called
1833 * stop but did not create a proper connection (connection was never
1834 * bound or it was unbound then stop was called).
1835 */
1836 if (!conn->recv_lock) {
1837 spin_unlock_bh(&session->lock);
1838 mutex_unlock(&session->eh_mutex);
1839 return;
1840 }
1841
1842 /*
1843 * When this is called for the in_login state, we only want to clean
1844 * up the login task and connection. We do not need to block and set
1845 * the recovery state again
1846 */
1847 if (flag == STOP_CONN_TERM)
1848 session->state = ISCSI_STATE_TERMINATE;
1849 else if (conn->stop_stage != STOP_CONN_RECOVER)
1850 session->state = ISCSI_STATE_IN_RECOVERY;
1851
1852 old_stop_stage = conn->stop_stage;
1853 conn->stop_stage = flag;
1854 conn->c_stage = ISCSI_CONN_STOPPED;
1855 spin_unlock_bh(&session->lock);
1856
1857 iscsi_suspend_tx(conn);
1858
1859 write_lock_bh(conn->recv_lock);
1860 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
1861 write_unlock_bh(conn->recv_lock);
1862
1863 /*
1864 * for connection level recovery we should not calculate
1865 * header digest. conn->hdr_size used for optimization
1866 * in hdr_extract() and will be re-negotiated at
1867 * set_param() time.
1868 */
1869 if (flag == STOP_CONN_RECOVER) {
1870 conn->hdrdgst_en = 0;
1871 conn->datadgst_en = 0;
1872 if (session->state == ISCSI_STATE_IN_RECOVERY &&
1873 old_stop_stage != STOP_CONN_RECOVER) {
1874 debug_scsi("blocking session\n");
1875 iscsi_block_session(session_to_cls(session));
1876 }
1877 }
1878
1879 /*
1880 * flush queues.
1881 */
1882 spin_lock_bh(&session->lock);
1883 fail_all_commands(conn, -1);
1884 flush_control_queues(session, conn);
1885 spin_unlock_bh(&session->lock);
1886 mutex_unlock(&session->eh_mutex);
1887 }
1888
1889 void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
1890 {
1891 struct iscsi_conn *conn = cls_conn->dd_data;
1892 struct iscsi_session *session = conn->session;
1893
1894 switch (flag) {
1895 case STOP_CONN_RECOVER:
1896 case STOP_CONN_TERM:
1897 iscsi_start_session_recovery(session, conn, flag);
1898 break;
1899 default:
1900 printk(KERN_ERR "iscsi: invalid stop flag %d\n", flag);
1901 }
1902 }
1903 EXPORT_SYMBOL_GPL(iscsi_conn_stop);
1904
1905 int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
1906 struct iscsi_cls_conn *cls_conn, int is_leading)
1907 {
1908 struct iscsi_session *session = class_to_transport_session(cls_session);
1909 struct iscsi_conn *conn = cls_conn->dd_data;
1910
1911 spin_lock_bh(&session->lock);
1912 if (is_leading)
1913 session->leadconn = conn;
1914 spin_unlock_bh(&session->lock);
1915
1916 /*
1917 * Unblock xmitworker(), Login Phase will pass through.
1918 */
1919 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
1920 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1921 return 0;
1922 }
1923 EXPORT_SYMBOL_GPL(iscsi_conn_bind);
1924
1925
1926 int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
1927 enum iscsi_param param, char *buf, int buflen)
1928 {
1929 struct iscsi_conn *conn = cls_conn->dd_data;
1930 struct iscsi_session *session = conn->session;
1931 uint32_t value;
1932
1933 switch(param) {
1934 case ISCSI_PARAM_FAST_ABORT:
1935 sscanf(buf, "%d", &session->fast_abort);
1936 break;
1937 case ISCSI_PARAM_MAX_RECV_DLENGTH:
1938 sscanf(buf, "%d", &conn->max_recv_dlength);
1939 break;
1940 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
1941 sscanf(buf, "%d", &conn->max_xmit_dlength);
1942 break;
1943 case ISCSI_PARAM_HDRDGST_EN:
1944 sscanf(buf, "%d", &conn->hdrdgst_en);
1945 break;
1946 case ISCSI_PARAM_DATADGST_EN:
1947 sscanf(buf, "%d", &conn->datadgst_en);
1948 break;
1949 case ISCSI_PARAM_INITIAL_R2T_EN:
1950 sscanf(buf, "%d", &session->initial_r2t_en);
1951 break;
1952 case ISCSI_PARAM_MAX_R2T:
1953 sscanf(buf, "%d", &session->max_r2t);
1954 break;
1955 case ISCSI_PARAM_IMM_DATA_EN:
1956 sscanf(buf, "%d", &session->imm_data_en);
1957 break;
1958 case ISCSI_PARAM_FIRST_BURST:
1959 sscanf(buf, "%d", &session->first_burst);
1960 break;
1961 case ISCSI_PARAM_MAX_BURST:
1962 sscanf(buf, "%d", &session->max_burst);
1963 break;
1964 case ISCSI_PARAM_PDU_INORDER_EN:
1965 sscanf(buf, "%d", &session->pdu_inorder_en);
1966 break;
1967 case ISCSI_PARAM_DATASEQ_INORDER_EN:
1968 sscanf(buf, "%d", &session->dataseq_inorder_en);
1969 break;
1970 case ISCSI_PARAM_ERL:
1971 sscanf(buf, "%d", &session->erl);
1972 break;
1973 case ISCSI_PARAM_IFMARKER_EN:
1974 sscanf(buf, "%d", &value);
1975 BUG_ON(value);
1976 break;
1977 case ISCSI_PARAM_OFMARKER_EN:
1978 sscanf(buf, "%d", &value);
1979 BUG_ON(value);
1980 break;
1981 case ISCSI_PARAM_EXP_STATSN:
1982 sscanf(buf, "%u", &conn->exp_statsn);
1983 break;
1984 case ISCSI_PARAM_USERNAME:
1985 kfree(session->username);
1986 session->username = kstrdup(buf, GFP_KERNEL);
1987 if (!session->username)
1988 return -ENOMEM;
1989 break;
1990 case ISCSI_PARAM_USERNAME_IN:
1991 kfree(session->username_in);
1992 session->username_in = kstrdup(buf, GFP_KERNEL);
1993 if (!session->username_in)
1994 return -ENOMEM;
1995 break;
1996 case ISCSI_PARAM_PASSWORD:
1997 kfree(session->password);
1998 session->password = kstrdup(buf, GFP_KERNEL);
1999 if (!session->password)
2000 return -ENOMEM;
2001 break;
2002 case ISCSI_PARAM_PASSWORD_IN:
2003 kfree(session->password_in);
2004 session->password_in = kstrdup(buf, GFP_KERNEL);
2005 if (!session->password_in)
2006 return -ENOMEM;
2007 break;
2008 case ISCSI_PARAM_TARGET_NAME:
2009 /* this should not change between logins */
2010 if (session->targetname)
2011 break;
2012
2013 session->targetname = kstrdup(buf, GFP_KERNEL);
2014 if (!session->targetname)
2015 return -ENOMEM;
2016 break;
2017 case ISCSI_PARAM_TPGT:
2018 sscanf(buf, "%d", &session->tpgt);
2019 break;
2020 case ISCSI_PARAM_PERSISTENT_PORT:
2021 sscanf(buf, "%d", &conn->persistent_port);
2022 break;
2023 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2024 /*
2025 * this is the address returned in discovery so it should
2026 * not change between logins.
2027 */
2028 if (conn->persistent_address)
2029 break;
2030
2031 conn->persistent_address = kstrdup(buf, GFP_KERNEL);
2032 if (!conn->persistent_address)
2033 return -ENOMEM;
2034 break;
2035 default:
2036 return -ENOSYS;
2037 }
2038
2039 return 0;
2040 }
2041 EXPORT_SYMBOL_GPL(iscsi_set_param);
2042
2043 int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
2044 enum iscsi_param param, char *buf)
2045 {
2046 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
2047 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
2048 int len;
2049
2050 switch(param) {
2051 case ISCSI_PARAM_FAST_ABORT:
2052 len = sprintf(buf, "%d\n", session->fast_abort);
2053 break;
2054 case ISCSI_PARAM_INITIAL_R2T_EN:
2055 len = sprintf(buf, "%d\n", session->initial_r2t_en);
2056 break;
2057 case ISCSI_PARAM_MAX_R2T:
2058 len = sprintf(buf, "%hu\n", session->max_r2t);
2059 break;
2060 case ISCSI_PARAM_IMM_DATA_EN:
2061 len = sprintf(buf, "%d\n", session->imm_data_en);
2062 break;
2063 case ISCSI_PARAM_FIRST_BURST:
2064 len = sprintf(buf, "%u\n", session->first_burst);
2065 break;
2066 case ISCSI_PARAM_MAX_BURST:
2067 len = sprintf(buf, "%u\n", session->max_burst);
2068 break;
2069 case ISCSI_PARAM_PDU_INORDER_EN:
2070 len = sprintf(buf, "%d\n", session->pdu_inorder_en);
2071 break;
2072 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2073 len = sprintf(buf, "%d\n", session->dataseq_inorder_en);
2074 break;
2075 case ISCSI_PARAM_ERL:
2076 len = sprintf(buf, "%d\n", session->erl);
2077 break;
2078 case ISCSI_PARAM_TARGET_NAME:
2079 len = sprintf(buf, "%s\n", session->targetname);
2080 break;
2081 case ISCSI_PARAM_TPGT:
2082 len = sprintf(buf, "%d\n", session->tpgt);
2083 break;
2084 case ISCSI_PARAM_USERNAME:
2085 len = sprintf(buf, "%s\n", session->username);
2086 break;
2087 case ISCSI_PARAM_USERNAME_IN:
2088 len = sprintf(buf, "%s\n", session->username_in);
2089 break;
2090 case ISCSI_PARAM_PASSWORD:
2091 len = sprintf(buf, "%s\n", session->password);
2092 break;
2093 case ISCSI_PARAM_PASSWORD_IN:
2094 len = sprintf(buf, "%s\n", session->password_in);
2095 break;
2096 default:
2097 return -ENOSYS;
2098 }
2099
2100 return len;
2101 }
2102 EXPORT_SYMBOL_GPL(iscsi_session_get_param);
2103
2104 int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
2105 enum iscsi_param param, char *buf)
2106 {
2107 struct iscsi_conn *conn = cls_conn->dd_data;
2108 int len;
2109
2110 switch(param) {
2111 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2112 len = sprintf(buf, "%u\n", conn->max_recv_dlength);
2113 break;
2114 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2115 len = sprintf(buf, "%u\n", conn->max_xmit_dlength);
2116 break;
2117 case ISCSI_PARAM_HDRDGST_EN:
2118 len = sprintf(buf, "%d\n", conn->hdrdgst_en);
2119 break;
2120 case ISCSI_PARAM_DATADGST_EN:
2121 len = sprintf(buf, "%d\n", conn->datadgst_en);
2122 break;
2123 case ISCSI_PARAM_IFMARKER_EN:
2124 len = sprintf(buf, "%d\n", conn->ifmarker_en);
2125 break;
2126 case ISCSI_PARAM_OFMARKER_EN:
2127 len = sprintf(buf, "%d\n", conn->ofmarker_en);
2128 break;
2129 case ISCSI_PARAM_EXP_STATSN:
2130 len = sprintf(buf, "%u\n", conn->exp_statsn);
2131 break;
2132 case ISCSI_PARAM_PERSISTENT_PORT:
2133 len = sprintf(buf, "%d\n", conn->persistent_port);
2134 break;
2135 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2136 len = sprintf(buf, "%s\n", conn->persistent_address);
2137 break;
2138 default:
2139 return -ENOSYS;
2140 }
2141
2142 return len;
2143 }
2144 EXPORT_SYMBOL_GPL(iscsi_conn_get_param);
2145
2146 int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2147 char *buf)
2148 {
2149 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
2150 int len;
2151
2152 switch (param) {
2153 case ISCSI_HOST_PARAM_NETDEV_NAME:
2154 if (!session->netdev)
2155 len = sprintf(buf, "%s\n", "default");
2156 else
2157 len = sprintf(buf, "%s\n", session->netdev);
2158 break;
2159 case ISCSI_HOST_PARAM_HWADDRESS:
2160 if (!session->hwaddress)
2161 len = sprintf(buf, "%s\n", "default");
2162 else
2163 len = sprintf(buf, "%s\n", session->hwaddress);
2164 break;
2165 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2166 if (!session->initiatorname)
2167 len = sprintf(buf, "%s\n", "unknown");
2168 else
2169 len = sprintf(buf, "%s\n", session->initiatorname);
2170 break;
2171
2172 default:
2173 return -ENOSYS;
2174 }
2175
2176 return len;
2177 }
2178 EXPORT_SYMBOL_GPL(iscsi_host_get_param);
2179
2180 int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2181 char *buf, int buflen)
2182 {
2183 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
2184
2185 switch (param) {
2186 case ISCSI_HOST_PARAM_NETDEV_NAME:
2187 if (!session->netdev)
2188 session->netdev = kstrdup(buf, GFP_KERNEL);
2189 break;
2190 case ISCSI_HOST_PARAM_HWADDRESS:
2191 if (!session->hwaddress)
2192 session->hwaddress = kstrdup(buf, GFP_KERNEL);
2193 break;
2194 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2195 if (!session->initiatorname)
2196 session->initiatorname = kstrdup(buf, GFP_KERNEL);
2197 break;
2198 default:
2199 return -ENOSYS;
2200 }
2201
2202 return 0;
2203 }
2204 EXPORT_SYMBOL_GPL(iscsi_host_set_param);
2205
2206 MODULE_AUTHOR("Mike Christie");
2207 MODULE_DESCRIPTION("iSCSI library functions");
2208 MODULE_LICENSE("GPL");
kernel source for telekom puls (alcatel/mediatek)