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[SCSI] iscsi_tcp, libiscsi: initial AHS Support
[mirror_ubuntu-zesty-kernel.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 static void fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
41 int err);
42
43 struct iscsi_session *
44 class_to_transport_session(struct iscsi_cls_session *cls_session)
45 {
46 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
47 return iscsi_hostdata(shost->hostdata);
48 }
49 EXPORT_SYMBOL_GPL(class_to_transport_session);
50
51 /* Serial Number Arithmetic, 32 bits, less than, RFC1982 */
52 #define SNA32_CHECK 2147483648UL
53
54 static int iscsi_sna_lt(u32 n1, u32 n2)
55 {
56 return n1 != n2 && ((n1 < n2 && (n2 - n1 < SNA32_CHECK)) ||
57 (n1 > n2 && (n2 - n1 < SNA32_CHECK)));
58 }
59
60 /* Serial Number Arithmetic, 32 bits, less than, RFC1982 */
61 static int iscsi_sna_lte(u32 n1, u32 n2)
62 {
63 return n1 == n2 || ((n1 < n2 && (n2 - n1 < SNA32_CHECK)) ||
64 (n1 > n2 && (n2 - n1 < SNA32_CHECK)));
65 }
66
67 void
68 iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr)
69 {
70 uint32_t max_cmdsn = be32_to_cpu(hdr->max_cmdsn);
71 uint32_t exp_cmdsn = be32_to_cpu(hdr->exp_cmdsn);
72
73 /*
74 * standard specifies this check for when to update expected and
75 * max sequence numbers
76 */
77 if (iscsi_sna_lt(max_cmdsn, exp_cmdsn - 1))
78 return;
79
80 if (exp_cmdsn != session->exp_cmdsn &&
81 !iscsi_sna_lt(exp_cmdsn, session->exp_cmdsn))
82 session->exp_cmdsn = exp_cmdsn;
83
84 if (max_cmdsn != session->max_cmdsn &&
85 !iscsi_sna_lt(max_cmdsn, session->max_cmdsn)) {
86 session->max_cmdsn = max_cmdsn;
87 /*
88 * if the window closed with IO queued, then kick the
89 * xmit thread
90 */
91 if (!list_empty(&session->leadconn->xmitqueue) ||
92 !list_empty(&session->leadconn->mgmtqueue))
93 scsi_queue_work(session->host,
94 &session->leadconn->xmitwork);
95 }
96 }
97 EXPORT_SYMBOL_GPL(iscsi_update_cmdsn);
98
99 void iscsi_prep_unsolicit_data_pdu(struct iscsi_cmd_task *ctask,
100 struct iscsi_data *hdr)
101 {
102 struct iscsi_conn *conn = ctask->conn;
103
104 memset(hdr, 0, sizeof(struct iscsi_data));
105 hdr->ttt = cpu_to_be32(ISCSI_RESERVED_TAG);
106 hdr->datasn = cpu_to_be32(ctask->unsol_datasn);
107 ctask->unsol_datasn++;
108 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
109 memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
110
111 hdr->itt = ctask->hdr->itt;
112 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
113 hdr->offset = cpu_to_be32(ctask->unsol_offset);
114
115 if (ctask->unsol_count > conn->max_xmit_dlength) {
116 hton24(hdr->dlength, conn->max_xmit_dlength);
117 ctask->data_count = conn->max_xmit_dlength;
118 ctask->unsol_offset += ctask->data_count;
119 hdr->flags = 0;
120 } else {
121 hton24(hdr->dlength, ctask->unsol_count);
122 ctask->data_count = ctask->unsol_count;
123 hdr->flags = ISCSI_FLAG_CMD_FINAL;
124 }
125 }
126 EXPORT_SYMBOL_GPL(iscsi_prep_unsolicit_data_pdu);
127
128 static int iscsi_add_hdr(struct iscsi_cmd_task *ctask, unsigned len)
129 {
130 unsigned exp_len = ctask->hdr_len + len;
131
132 if (exp_len > ctask->hdr_max) {
133 WARN_ON(1);
134 return -EINVAL;
135 }
136
137 WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */
138 ctask->hdr_len = exp_len;
139 return 0;
140 }
141
142 /**
143 * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
144 * @ctask: iscsi cmd task
145 *
146 * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set
147 * fields like dlength or final based on how much data it sends
148 */
149 static int iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask)
150 {
151 struct iscsi_conn *conn = ctask->conn;
152 struct iscsi_session *session = conn->session;
153 struct iscsi_cmd *hdr = ctask->hdr;
154 struct scsi_cmnd *sc = ctask->sc;
155 unsigned hdrlength;
156 int rc;
157
158 ctask->hdr_len = 0;
159 rc = iscsi_add_hdr(ctask, sizeof(*hdr));
160 if (rc)
161 return rc;
162 hdr->opcode = ISCSI_OP_SCSI_CMD;
163 hdr->flags = ISCSI_ATTR_SIMPLE;
164 int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun);
165 hdr->itt = build_itt(ctask->itt, conn->id, session->age);
166 hdr->data_length = cpu_to_be32(scsi_bufflen(sc));
167 hdr->cmdsn = cpu_to_be32(session->cmdsn);
168 session->cmdsn++;
169 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
170 memcpy(hdr->cdb, sc->cmnd, sc->cmd_len);
171 if (sc->cmd_len < MAX_COMMAND_SIZE)
172 memset(&hdr->cdb[sc->cmd_len], 0,
173 MAX_COMMAND_SIZE - sc->cmd_len);
174
175 ctask->data_count = 0;
176 ctask->imm_count = 0;
177 if (sc->sc_data_direction == DMA_TO_DEVICE) {
178 hdr->flags |= ISCSI_FLAG_CMD_WRITE;
179 /*
180 * Write counters:
181 *
182 * imm_count bytes to be sent right after
183 * SCSI PDU Header
184 *
185 * unsol_count bytes(as Data-Out) to be sent
186 * without R2T ack right after
187 * immediate data
188 *
189 * r2t_data_count bytes to be sent via R2T ack's
190 *
191 * pad_count bytes to be sent as zero-padding
192 */
193 ctask->unsol_count = 0;
194 ctask->unsol_offset = 0;
195 ctask->unsol_datasn = 0;
196
197 if (session->imm_data_en) {
198 if (scsi_bufflen(sc) >= session->first_burst)
199 ctask->imm_count = min(session->first_burst,
200 conn->max_xmit_dlength);
201 else
202 ctask->imm_count = min(scsi_bufflen(sc),
203 conn->max_xmit_dlength);
204 hton24(ctask->hdr->dlength, ctask->imm_count);
205 } else
206 zero_data(ctask->hdr->dlength);
207
208 if (!session->initial_r2t_en) {
209 ctask->unsol_count = min((session->first_burst),
210 (scsi_bufflen(sc))) - ctask->imm_count;
211 ctask->unsol_offset = ctask->imm_count;
212 }
213
214 if (!ctask->unsol_count)
215 /* No unsolicit Data-Out's */
216 ctask->hdr->flags |= ISCSI_FLAG_CMD_FINAL;
217 } else {
218 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
219 zero_data(hdr->dlength);
220
221 if (sc->sc_data_direction == DMA_FROM_DEVICE)
222 hdr->flags |= ISCSI_FLAG_CMD_READ;
223 }
224
225 /* calculate size of additional header segments (AHSs) */
226 hdrlength = ctask->hdr_len - sizeof(*hdr);
227
228 WARN_ON(hdrlength & (ISCSI_PAD_LEN-1));
229 hdrlength /= ISCSI_PAD_LEN;
230
231 WARN_ON(hdrlength >= 256);
232 hdr->hlength = hdrlength & 0xFF;
233
234 conn->scsicmd_pdus_cnt++;
235
236 debug_scsi("iscsi prep [%s cid %d sc %p cdb 0x%x itt 0x%x len %d "
237 "cmdsn %d win %d]\n",
238 sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read",
239 conn->id, sc, sc->cmnd[0], ctask->itt, scsi_bufflen(sc),
240 session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1);
241 return 0;
242 }
243
244 /**
245 * iscsi_complete_command - return command back to scsi-ml
246 * @ctask: iscsi cmd task
247 *
248 * Must be called with session lock.
249 * This function returns the scsi command to scsi-ml and returns
250 * the cmd task to the pool of available cmd tasks.
251 */
252 static void iscsi_complete_command(struct iscsi_cmd_task *ctask)
253 {
254 struct iscsi_session *session = ctask->conn->session;
255 struct scsi_cmnd *sc = ctask->sc;
256
257 ctask->state = ISCSI_TASK_COMPLETED;
258 ctask->sc = NULL;
259 /* SCSI eh reuses commands to verify us */
260 sc->SCp.ptr = NULL;
261 list_del_init(&ctask->running);
262 __kfifo_put(session->cmdpool.queue, (void*)&ctask, sizeof(void*));
263 sc->scsi_done(sc);
264 }
265
266 static void __iscsi_get_ctask(struct iscsi_cmd_task *ctask)
267 {
268 atomic_inc(&ctask->refcount);
269 }
270
271 static void __iscsi_put_ctask(struct iscsi_cmd_task *ctask)
272 {
273 if (atomic_dec_and_test(&ctask->refcount))
274 iscsi_complete_command(ctask);
275 }
276
277 /**
278 * iscsi_cmd_rsp - SCSI Command Response processing
279 * @conn: iscsi connection
280 * @hdr: iscsi header
281 * @ctask: scsi command task
282 * @data: cmd data buffer
283 * @datalen: len of buffer
284 *
285 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and
286 * then completes the command and task.
287 **/
288 static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
289 struct iscsi_cmd_task *ctask, char *data,
290 int datalen)
291 {
292 struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)hdr;
293 struct iscsi_session *session = conn->session;
294 struct scsi_cmnd *sc = ctask->sc;
295
296 iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr);
297 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
298
299 sc->result = (DID_OK << 16) | rhdr->cmd_status;
300
301 if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) {
302 sc->result = DID_ERROR << 16;
303 goto out;
304 }
305
306 if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) {
307 uint16_t senselen;
308
309 if (datalen < 2) {
310 invalid_datalen:
311 printk(KERN_ERR "iscsi: Got CHECK_CONDITION but "
312 "invalid data buffer size of %d\n", datalen);
313 sc->result = DID_BAD_TARGET << 16;
314 goto out;
315 }
316
317 senselen = be16_to_cpu(get_unaligned((__be16 *) data));
318 if (datalen < senselen)
319 goto invalid_datalen;
320
321 memcpy(sc->sense_buffer, data + 2,
322 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
323 debug_scsi("copied %d bytes of sense\n",
324 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
325 }
326
327 if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW |
328 ISCSI_FLAG_CMD_OVERFLOW)) {
329 int res_count = be32_to_cpu(rhdr->residual_count);
330
331 if (res_count > 0 &&
332 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
333 res_count <= scsi_bufflen(sc)))
334 scsi_set_resid(sc, res_count);
335 else
336 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
337 } else if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW |
338 ISCSI_FLAG_CMD_BIDI_OVERFLOW))
339 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
340
341 out:
342 debug_scsi("done [sc %lx res %d itt 0x%x]\n",
343 (long)sc, sc->result, ctask->itt);
344 conn->scsirsp_pdus_cnt++;
345
346 __iscsi_put_ctask(ctask);
347 }
348
349 static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
350 {
351 struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr;
352
353 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
354 conn->tmfrsp_pdus_cnt++;
355
356 if (conn->tmf_state != TMF_QUEUED)
357 return;
358
359 if (tmf->response == ISCSI_TMF_RSP_COMPLETE)
360 conn->tmf_state = TMF_SUCCESS;
361 else if (tmf->response == ISCSI_TMF_RSP_NO_TASK)
362 conn->tmf_state = TMF_NOT_FOUND;
363 else
364 conn->tmf_state = TMF_FAILED;
365 wake_up(&conn->ehwait);
366 }
367
368 static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
369 char *data, int datalen)
370 {
371 struct iscsi_reject *reject = (struct iscsi_reject *)hdr;
372 struct iscsi_hdr rejected_pdu;
373 uint32_t itt;
374
375 conn->exp_statsn = be32_to_cpu(reject->statsn) + 1;
376
377 if (reject->reason == ISCSI_REASON_DATA_DIGEST_ERROR) {
378 if (ntoh24(reject->dlength) > datalen)
379 return ISCSI_ERR_PROTO;
380
381 if (ntoh24(reject->dlength) >= sizeof(struct iscsi_hdr)) {
382 memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr));
383 itt = get_itt(rejected_pdu.itt);
384 printk(KERN_ERR "itt 0x%x had pdu (op 0x%x) rejected "
385 "due to DataDigest error.\n", itt,
386 rejected_pdu.opcode);
387 }
388 }
389 return 0;
390 }
391
392 /**
393 * __iscsi_complete_pdu - complete pdu
394 * @conn: iscsi conn
395 * @hdr: iscsi header
396 * @data: data buffer
397 * @datalen: len of data buffer
398 *
399 * Completes pdu processing by freeing any resources allocated at
400 * queuecommand or send generic. session lock must be held and verify
401 * itt must have been called.
402 */
403 int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
404 char *data, int datalen)
405 {
406 struct iscsi_session *session = conn->session;
407 int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0;
408 struct iscsi_cmd_task *ctask;
409 struct iscsi_mgmt_task *mtask;
410 uint32_t itt;
411
412 if (hdr->itt != RESERVED_ITT)
413 itt = get_itt(hdr->itt);
414 else
415 itt = ~0U;
416
417 if (itt < session->cmds_max) {
418 ctask = session->cmds[itt];
419
420 debug_scsi("cmdrsp [op 0x%x cid %d itt 0x%x len %d]\n",
421 opcode, conn->id, ctask->itt, datalen);
422
423 switch(opcode) {
424 case ISCSI_OP_SCSI_CMD_RSP:
425 BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
426 iscsi_scsi_cmd_rsp(conn, hdr, ctask, data,
427 datalen);
428 break;
429 case ISCSI_OP_SCSI_DATA_IN:
430 BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
431 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
432 conn->scsirsp_pdus_cnt++;
433 __iscsi_put_ctask(ctask);
434 }
435 break;
436 case ISCSI_OP_R2T:
437 /* LLD handles this for now */
438 break;
439 default:
440 rc = ISCSI_ERR_BAD_OPCODE;
441 break;
442 }
443 } else if (itt >= ISCSI_MGMT_ITT_OFFSET &&
444 itt < ISCSI_MGMT_ITT_OFFSET + session->mgmtpool_max) {
445 mtask = session->mgmt_cmds[itt - ISCSI_MGMT_ITT_OFFSET];
446
447 debug_scsi("immrsp [op 0x%x cid %d itt 0x%x len %d]\n",
448 opcode, conn->id, mtask->itt, datalen);
449
450 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
451 switch(opcode) {
452 case ISCSI_OP_LOGOUT_RSP:
453 if (datalen) {
454 rc = ISCSI_ERR_PROTO;
455 break;
456 }
457 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
458 /* fall through */
459 case ISCSI_OP_LOGIN_RSP:
460 case ISCSI_OP_TEXT_RSP:
461 /*
462 * login related PDU's exp_statsn is handled in
463 * userspace
464 */
465 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
466 rc = ISCSI_ERR_CONN_FAILED;
467 list_del_init(&mtask->running);
468 if (conn->login_mtask != mtask)
469 __kfifo_put(session->mgmtpool.queue,
470 (void*)&mtask, sizeof(void*));
471 break;
472 case ISCSI_OP_SCSI_TMFUNC_RSP:
473 if (datalen) {
474 rc = ISCSI_ERR_PROTO;
475 break;
476 }
477
478 iscsi_tmf_rsp(conn, hdr);
479 break;
480 case ISCSI_OP_NOOP_IN:
481 if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) {
482 rc = ISCSI_ERR_PROTO;
483 break;
484 }
485 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
486
487 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
488 rc = ISCSI_ERR_CONN_FAILED;
489 list_del_init(&mtask->running);
490 __kfifo_put(session->mgmtpool.queue,
491 (void*)&mtask, sizeof(void*));
492 break;
493 default:
494 rc = ISCSI_ERR_BAD_OPCODE;
495 break;
496 }
497 } else if (itt == ~0U) {
498 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
499
500 switch(opcode) {
501 case ISCSI_OP_NOOP_IN:
502 if (datalen) {
503 rc = ISCSI_ERR_PROTO;
504 break;
505 }
506
507 if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG))
508 break;
509
510 if (iscsi_recv_pdu(conn->cls_conn, hdr, NULL, 0))
511 rc = ISCSI_ERR_CONN_FAILED;
512 break;
513 case ISCSI_OP_REJECT:
514 rc = iscsi_handle_reject(conn, hdr, data, datalen);
515 break;
516 case ISCSI_OP_ASYNC_EVENT:
517 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
518 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
519 rc = ISCSI_ERR_CONN_FAILED;
520 break;
521 default:
522 rc = ISCSI_ERR_BAD_OPCODE;
523 break;
524 }
525 } else
526 rc = ISCSI_ERR_BAD_ITT;
527
528 return rc;
529 }
530 EXPORT_SYMBOL_GPL(__iscsi_complete_pdu);
531
532 int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
533 char *data, int datalen)
534 {
535 int rc;
536
537 spin_lock(&conn->session->lock);
538 rc = __iscsi_complete_pdu(conn, hdr, data, datalen);
539 spin_unlock(&conn->session->lock);
540 return rc;
541 }
542 EXPORT_SYMBOL_GPL(iscsi_complete_pdu);
543
544 /* verify itt (itt encoding: age+cid+itt) */
545 int iscsi_verify_itt(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
546 uint32_t *ret_itt)
547 {
548 struct iscsi_session *session = conn->session;
549 struct iscsi_cmd_task *ctask;
550 uint32_t itt;
551
552 if (hdr->itt != RESERVED_ITT) {
553 if (((__force u32)hdr->itt & ISCSI_AGE_MASK) !=
554 (session->age << ISCSI_AGE_SHIFT)) {
555 printk(KERN_ERR "iscsi: received itt %x expected "
556 "session age (%x)\n", (__force u32)hdr->itt,
557 session->age & ISCSI_AGE_MASK);
558 return ISCSI_ERR_BAD_ITT;
559 }
560
561 if (((__force u32)hdr->itt & ISCSI_CID_MASK) !=
562 (conn->id << ISCSI_CID_SHIFT)) {
563 printk(KERN_ERR "iscsi: received itt %x, expected "
564 "CID (%x)\n", (__force u32)hdr->itt, conn->id);
565 return ISCSI_ERR_BAD_ITT;
566 }
567 itt = get_itt(hdr->itt);
568 } else
569 itt = ~0U;
570
571 if (itt < session->cmds_max) {
572 ctask = session->cmds[itt];
573
574 if (!ctask->sc) {
575 printk(KERN_INFO "iscsi: dropping ctask with "
576 "itt 0x%x\n", ctask->itt);
577 /* force drop */
578 return ISCSI_ERR_NO_SCSI_CMD;
579 }
580
581 if (ctask->sc->SCp.phase != session->age) {
582 printk(KERN_ERR "iscsi: ctask's session age %d, "
583 "expected %d\n", ctask->sc->SCp.phase,
584 session->age);
585 return ISCSI_ERR_SESSION_FAILED;
586 }
587 }
588
589 *ret_itt = itt;
590 return 0;
591 }
592 EXPORT_SYMBOL_GPL(iscsi_verify_itt);
593
594 void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
595 {
596 struct iscsi_session *session = conn->session;
597 unsigned long flags;
598
599 spin_lock_irqsave(&session->lock, flags);
600 if (session->state == ISCSI_STATE_FAILED) {
601 spin_unlock_irqrestore(&session->lock, flags);
602 return;
603 }
604
605 if (conn->stop_stage == 0)
606 session->state = ISCSI_STATE_FAILED;
607 spin_unlock_irqrestore(&session->lock, flags);
608 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
609 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
610 iscsi_conn_error(conn->cls_conn, err);
611 }
612 EXPORT_SYMBOL_GPL(iscsi_conn_failure);
613
614 static void iscsi_prep_mtask(struct iscsi_conn *conn,
615 struct iscsi_mgmt_task *mtask)
616 {
617 struct iscsi_session *session = conn->session;
618 struct iscsi_hdr *hdr = mtask->hdr;
619 struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
620
621 if (hdr->opcode != (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) &&
622 hdr->opcode != (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
623 nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
624 /*
625 * pre-format CmdSN for outgoing PDU.
626 */
627 nop->cmdsn = cpu_to_be32(session->cmdsn);
628 if (hdr->itt != RESERVED_ITT) {
629 hdr->itt = build_itt(mtask->itt, conn->id, session->age);
630 /*
631 * TODO: We always use immediate, so we never hit this.
632 * If we start to send tmfs or nops as non-immediate then
633 * we should start checking the cmdsn numbers for mgmt tasks.
634 */
635 if (conn->c_stage == ISCSI_CONN_STARTED &&
636 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
637 session->queued_cmdsn++;
638 session->cmdsn++;
639 }
640 }
641
642 if (session->tt->init_mgmt_task)
643 session->tt->init_mgmt_task(conn, mtask);
644
645 debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n",
646 hdr->opcode & ISCSI_OPCODE_MASK, hdr->itt,
647 mtask->data_count);
648 }
649
650 static int iscsi_xmit_mtask(struct iscsi_conn *conn)
651 {
652 struct iscsi_hdr *hdr = conn->mtask->hdr;
653 int rc, was_logout = 0;
654
655 spin_unlock_bh(&conn->session->lock);
656 if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT) {
657 conn->session->state = ISCSI_STATE_IN_RECOVERY;
658 iscsi_block_session(session_to_cls(conn->session));
659 was_logout = 1;
660 }
661 rc = conn->session->tt->xmit_mgmt_task(conn, conn->mtask);
662 spin_lock_bh(&conn->session->lock);
663 if (rc)
664 return rc;
665
666 /* done with this in-progress mtask */
667 conn->mtask = NULL;
668
669 if (was_logout) {
670 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
671 return -ENODATA;
672 }
673 return 0;
674 }
675
676 static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn)
677 {
678 struct iscsi_session *session = conn->session;
679
680 /*
681 * Check for iSCSI window and take care of CmdSN wrap-around
682 */
683 if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) {
684 debug_scsi("iSCSI CmdSN closed. ExpCmdSn %u MaxCmdSN %u "
685 "CmdSN %u/%u\n", session->exp_cmdsn,
686 session->max_cmdsn, session->cmdsn,
687 session->queued_cmdsn);
688 return -ENOSPC;
689 }
690 return 0;
691 }
692
693 static int iscsi_xmit_ctask(struct iscsi_conn *conn)
694 {
695 struct iscsi_cmd_task *ctask = conn->ctask;
696 int rc;
697
698 __iscsi_get_ctask(ctask);
699 spin_unlock_bh(&conn->session->lock);
700 rc = conn->session->tt->xmit_cmd_task(conn, ctask);
701 spin_lock_bh(&conn->session->lock);
702 __iscsi_put_ctask(ctask);
703 if (!rc)
704 /* done with this ctask */
705 conn->ctask = NULL;
706 return rc;
707 }
708
709 /**
710 * iscsi_requeue_ctask - requeue ctask to run from session workqueue
711 * @ctask: ctask to requeue
712 *
713 * LLDs that need to run a ctask from the session workqueue should call
714 * this. The session lock must be held.
715 */
716 void iscsi_requeue_ctask(struct iscsi_cmd_task *ctask)
717 {
718 struct iscsi_conn *conn = ctask->conn;
719
720 list_move_tail(&ctask->running, &conn->requeue);
721 scsi_queue_work(conn->session->host, &conn->xmitwork);
722 }
723 EXPORT_SYMBOL_GPL(iscsi_requeue_ctask);
724
725 /**
726 * iscsi_data_xmit - xmit any command into the scheduled connection
727 * @conn: iscsi connection
728 *
729 * Notes:
730 * The function can return -EAGAIN in which case the caller must
731 * re-schedule it again later or recover. '0' return code means
732 * successful xmit.
733 **/
734 static int iscsi_data_xmit(struct iscsi_conn *conn)
735 {
736 int rc = 0;
737
738 spin_lock_bh(&conn->session->lock);
739 if (unlikely(conn->suspend_tx)) {
740 debug_scsi("conn %d Tx suspended!\n", conn->id);
741 spin_unlock_bh(&conn->session->lock);
742 return -ENODATA;
743 }
744
745 if (conn->ctask) {
746 rc = iscsi_xmit_ctask(conn);
747 if (rc)
748 goto again;
749 }
750
751 if (conn->mtask) {
752 rc = iscsi_xmit_mtask(conn);
753 if (rc)
754 goto again;
755 }
756
757 /*
758 * process mgmt pdus like nops before commands since we should
759 * only have one nop-out as a ping from us and targets should not
760 * overflow us with nop-ins
761 */
762 check_mgmt:
763 while (!list_empty(&conn->mgmtqueue)) {
764 conn->mtask = list_entry(conn->mgmtqueue.next,
765 struct iscsi_mgmt_task, running);
766 iscsi_prep_mtask(conn, conn->mtask);
767 list_move_tail(conn->mgmtqueue.next, &conn->mgmt_run_list);
768 rc = iscsi_xmit_mtask(conn);
769 if (rc)
770 goto again;
771 }
772
773 /* process pending command queue */
774 while (!list_empty(&conn->xmitqueue)) {
775 if (conn->tmf_state == TMF_QUEUED)
776 break;
777
778 conn->ctask = list_entry(conn->xmitqueue.next,
779 struct iscsi_cmd_task, running);
780 if (iscsi_prep_scsi_cmd_pdu(conn->ctask)) {
781 fail_command(conn, conn->ctask, DID_ABORT << 16);
782 continue;
783 }
784 conn->session->tt->init_cmd_task(conn->ctask);
785 conn->ctask->state = ISCSI_TASK_RUNNING;
786 list_move_tail(conn->xmitqueue.next, &conn->run_list);
787 rc = iscsi_xmit_ctask(conn);
788 if (rc)
789 goto again;
790 /*
791 * we could continuously get new ctask requests so
792 * we need to check the mgmt queue for nops that need to
793 * be sent to aviod starvation
794 */
795 if (!list_empty(&conn->mgmtqueue))
796 goto check_mgmt;
797 }
798
799 while (!list_empty(&conn->requeue)) {
800 if (conn->session->fast_abort && conn->tmf_state != TMF_INITIAL)
801 break;
802
803 conn->ctask = list_entry(conn->requeue.next,
804 struct iscsi_cmd_task, running);
805 conn->ctask->state = ISCSI_TASK_RUNNING;
806 list_move_tail(conn->requeue.next, &conn->run_list);
807 rc = iscsi_xmit_ctask(conn);
808 if (rc)
809 goto again;
810 if (!list_empty(&conn->mgmtqueue))
811 goto check_mgmt;
812 }
813 spin_unlock_bh(&conn->session->lock);
814 return -ENODATA;
815
816 again:
817 if (unlikely(conn->suspend_tx))
818 rc = -ENODATA;
819 spin_unlock_bh(&conn->session->lock);
820 return rc;
821 }
822
823 static void iscsi_xmitworker(struct work_struct *work)
824 {
825 struct iscsi_conn *conn =
826 container_of(work, struct iscsi_conn, xmitwork);
827 int rc;
828 /*
829 * serialize Xmit worker on a per-connection basis.
830 */
831 do {
832 rc = iscsi_data_xmit(conn);
833 } while (rc >= 0 || rc == -EAGAIN);
834 }
835
836 enum {
837 FAILURE_BAD_HOST = 1,
838 FAILURE_SESSION_FAILED,
839 FAILURE_SESSION_FREED,
840 FAILURE_WINDOW_CLOSED,
841 FAILURE_OOM,
842 FAILURE_SESSION_TERMINATE,
843 FAILURE_SESSION_IN_RECOVERY,
844 FAILURE_SESSION_RECOVERY_TIMEOUT,
845 };
846
847 int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
848 {
849 struct Scsi_Host *host;
850 int reason = 0;
851 struct iscsi_session *session;
852 struct iscsi_conn *conn;
853 struct iscsi_cmd_task *ctask = NULL;
854
855 sc->scsi_done = done;
856 sc->result = 0;
857 sc->SCp.ptr = NULL;
858
859 host = sc->device->host;
860 session = iscsi_hostdata(host->hostdata);
861
862 spin_lock(&session->lock);
863
864 /*
865 * ISCSI_STATE_FAILED is a temp. state. The recovery
866 * code will decide what is best to do with command queued
867 * during this time
868 */
869 if (session->state != ISCSI_STATE_LOGGED_IN &&
870 session->state != ISCSI_STATE_FAILED) {
871 /*
872 * to handle the race between when we set the recovery state
873 * and block the session we requeue here (commands could
874 * be entering our queuecommand while a block is starting
875 * up because the block code is not locked)
876 */
877 if (session->state == ISCSI_STATE_IN_RECOVERY) {
878 reason = FAILURE_SESSION_IN_RECOVERY;
879 goto reject;
880 }
881
882 if (session->state == ISCSI_STATE_RECOVERY_FAILED)
883 reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
884 else if (session->state == ISCSI_STATE_TERMINATE)
885 reason = FAILURE_SESSION_TERMINATE;
886 else
887 reason = FAILURE_SESSION_FREED;
888 goto fault;
889 }
890
891 conn = session->leadconn;
892 if (!conn) {
893 reason = FAILURE_SESSION_FREED;
894 goto fault;
895 }
896
897 if (iscsi_check_cmdsn_window_closed(conn)) {
898 reason = FAILURE_WINDOW_CLOSED;
899 goto reject;
900 }
901
902 if (!__kfifo_get(session->cmdpool.queue, (void*)&ctask,
903 sizeof(void*))) {
904 reason = FAILURE_OOM;
905 goto reject;
906 }
907 session->queued_cmdsn++;
908
909 sc->SCp.phase = session->age;
910 sc->SCp.ptr = (char *)ctask;
911
912 atomic_set(&ctask->refcount, 1);
913 ctask->state = ISCSI_TASK_PENDING;
914 ctask->conn = conn;
915 ctask->sc = sc;
916 INIT_LIST_HEAD(&ctask->running);
917
918 list_add_tail(&ctask->running, &conn->xmitqueue);
919 spin_unlock(&session->lock);
920
921 scsi_queue_work(host, &conn->xmitwork);
922 return 0;
923
924 reject:
925 spin_unlock(&session->lock);
926 debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason);
927 return SCSI_MLQUEUE_HOST_BUSY;
928
929 fault:
930 spin_unlock(&session->lock);
931 printk(KERN_ERR "iscsi: cmd 0x%x is not queued (%d)\n",
932 sc->cmnd[0], reason);
933 sc->result = (DID_NO_CONNECT << 16);
934 scsi_set_resid(sc, scsi_bufflen(sc));
935 sc->scsi_done(sc);
936 return 0;
937 }
938 EXPORT_SYMBOL_GPL(iscsi_queuecommand);
939
940 int iscsi_change_queue_depth(struct scsi_device *sdev, int depth)
941 {
942 if (depth > ISCSI_MAX_CMD_PER_LUN)
943 depth = ISCSI_MAX_CMD_PER_LUN;
944 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
945 return sdev->queue_depth;
946 }
947 EXPORT_SYMBOL_GPL(iscsi_change_queue_depth);
948
949 static struct iscsi_mgmt_task *
950 __iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
951 char *data, uint32_t data_size)
952 {
953 struct iscsi_session *session = conn->session;
954 struct iscsi_mgmt_task *mtask;
955
956 if (session->state == ISCSI_STATE_TERMINATE)
957 return NULL;
958
959 if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) ||
960 hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
961 /*
962 * Login and Text are sent serially, in
963 * request-followed-by-response sequence.
964 * Same mtask can be used. Same ITT must be used.
965 * Note that login_mtask is preallocated at conn_create().
966 */
967 mtask = conn->login_mtask;
968 else {
969 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
970 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
971
972 if (!__kfifo_get(session->mgmtpool.queue,
973 (void*)&mtask, sizeof(void*)))
974 return NULL;
975 }
976
977 if (data_size) {
978 memcpy(mtask->data, data, data_size);
979 mtask->data_count = data_size;
980 } else
981 mtask->data_count = 0;
982
983 memcpy(mtask->hdr, hdr, sizeof(struct iscsi_hdr));
984 INIT_LIST_HEAD(&mtask->running);
985 list_add_tail(&mtask->running, &conn->mgmtqueue);
986 return mtask;
987 }
988
989 int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr,
990 char *data, uint32_t data_size)
991 {
992 struct iscsi_conn *conn = cls_conn->dd_data;
993 struct iscsi_session *session = conn->session;
994 int err = 0;
995
996 spin_lock_bh(&session->lock);
997 if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size))
998 err = -EPERM;
999 spin_unlock_bh(&session->lock);
1000 scsi_queue_work(session->host, &conn->xmitwork);
1001 return err;
1002 }
1003 EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu);
1004
1005 void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
1006 {
1007 struct iscsi_session *session = class_to_transport_session(cls_session);
1008
1009 spin_lock_bh(&session->lock);
1010 if (session->state != ISCSI_STATE_LOGGED_IN) {
1011 session->state = ISCSI_STATE_RECOVERY_FAILED;
1012 if (session->leadconn)
1013 wake_up(&session->leadconn->ehwait);
1014 }
1015 spin_unlock_bh(&session->lock);
1016 }
1017 EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
1018
1019 int iscsi_eh_host_reset(struct scsi_cmnd *sc)
1020 {
1021 struct Scsi_Host *host = sc->device->host;
1022 struct iscsi_session *session = iscsi_hostdata(host->hostdata);
1023 struct iscsi_conn *conn = session->leadconn;
1024
1025 spin_lock_bh(&session->lock);
1026 if (session->state == ISCSI_STATE_TERMINATE) {
1027 failed:
1028 debug_scsi("failing host reset: session terminated "
1029 "[CID %d age %d]\n", conn->id, session->age);
1030 spin_unlock_bh(&session->lock);
1031 return FAILED;
1032 }
1033
1034 spin_unlock_bh(&session->lock);
1035
1036 /*
1037 * we drop the lock here but the leadconn cannot be destoyed while
1038 * we are in the scsi eh
1039 */
1040 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1041
1042 debug_scsi("iscsi_eh_host_reset wait for relogin\n");
1043 wait_event_interruptible(conn->ehwait,
1044 session->state == ISCSI_STATE_TERMINATE ||
1045 session->state == ISCSI_STATE_LOGGED_IN ||
1046 session->state == ISCSI_STATE_RECOVERY_FAILED);
1047 if (signal_pending(current))
1048 flush_signals(current);
1049
1050 spin_lock_bh(&session->lock);
1051 if (session->state == ISCSI_STATE_LOGGED_IN)
1052 printk(KERN_INFO "iscsi: host reset succeeded\n");
1053 else
1054 goto failed;
1055 spin_unlock_bh(&session->lock);
1056
1057 return SUCCESS;
1058 }
1059 EXPORT_SYMBOL_GPL(iscsi_eh_host_reset);
1060
1061 static void iscsi_tmf_timedout(unsigned long data)
1062 {
1063 struct iscsi_conn *conn = (struct iscsi_conn *)data;
1064 struct iscsi_session *session = conn->session;
1065
1066 spin_lock(&session->lock);
1067 if (conn->tmf_state == TMF_QUEUED) {
1068 conn->tmf_state = TMF_TIMEDOUT;
1069 debug_scsi("tmf timedout\n");
1070 /* unblock eh_abort() */
1071 wake_up(&conn->ehwait);
1072 }
1073 spin_unlock(&session->lock);
1074 }
1075
1076 static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn,
1077 struct iscsi_tm *hdr, int age)
1078 {
1079 struct iscsi_session *session = conn->session;
1080 struct iscsi_mgmt_task *mtask;
1081
1082 mtask = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr,
1083 NULL, 0);
1084 if (!mtask) {
1085 spin_unlock_bh(&session->lock);
1086 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1087 spin_lock_bh(&session->lock);
1088 debug_scsi("tmf exec failure\n");
1089 return -EPERM;
1090 }
1091 conn->tmfcmd_pdus_cnt++;
1092 conn->tmf_timer.expires = 30 * HZ + jiffies;
1093 conn->tmf_timer.function = iscsi_tmf_timedout;
1094 conn->tmf_timer.data = (unsigned long)conn;
1095 add_timer(&conn->tmf_timer);
1096 debug_scsi("tmf set timeout\n");
1097
1098 spin_unlock_bh(&session->lock);
1099 mutex_unlock(&session->eh_mutex);
1100 scsi_queue_work(session->host, &conn->xmitwork);
1101
1102 /*
1103 * block eh thread until:
1104 *
1105 * 1) tmf response
1106 * 2) tmf timeout
1107 * 3) session is terminated or restarted or userspace has
1108 * given up on recovery
1109 */
1110 wait_event_interruptible(conn->ehwait, age != session->age ||
1111 session->state != ISCSI_STATE_LOGGED_IN ||
1112 conn->tmf_state != TMF_QUEUED);
1113 if (signal_pending(current))
1114 flush_signals(current);
1115 del_timer_sync(&conn->tmf_timer);
1116
1117 mutex_lock(&session->eh_mutex);
1118 spin_lock_bh(&session->lock);
1119 /* if the session drops it will clean up the mtask */
1120 if (age != session->age ||
1121 session->state != ISCSI_STATE_LOGGED_IN)
1122 return -ENOTCONN;
1123
1124 if (!list_empty(&mtask->running)) {
1125 list_del_init(&mtask->running);
1126 __kfifo_put(session->mgmtpool.queue, (void*)&mtask,
1127 sizeof(void*));
1128 }
1129 return 0;
1130 }
1131
1132 /*
1133 * session lock must be held
1134 */
1135 static void fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
1136 int err)
1137 {
1138 struct scsi_cmnd *sc;
1139
1140 sc = ctask->sc;
1141 if (!sc)
1142 return;
1143
1144 if (ctask->state == ISCSI_TASK_PENDING)
1145 /*
1146 * cmd never made it to the xmit thread, so we should not count
1147 * the cmd in the sequencing
1148 */
1149 conn->session->queued_cmdsn--;
1150 else
1151 conn->session->tt->cleanup_cmd_task(conn, ctask);
1152
1153 sc->result = err;
1154 scsi_set_resid(sc, scsi_bufflen(sc));
1155 if (conn->ctask == ctask)
1156 conn->ctask = NULL;
1157 /* release ref from queuecommand */
1158 __iscsi_put_ctask(ctask);
1159 }
1160
1161 /*
1162 * Fail commands. session lock held and recv side suspended and xmit
1163 * thread flushed
1164 */
1165 static void fail_all_commands(struct iscsi_conn *conn, unsigned lun)
1166 {
1167 struct iscsi_cmd_task *ctask, *tmp;
1168
1169 if (conn->ctask && (conn->ctask->sc->device->lun == lun || lun == -1))
1170 conn->ctask = NULL;
1171
1172 /* flush pending */
1173 list_for_each_entry_safe(ctask, tmp, &conn->xmitqueue, running) {
1174 if (lun == ctask->sc->device->lun || lun == -1) {
1175 debug_scsi("failing pending sc %p itt 0x%x\n",
1176 ctask->sc, ctask->itt);
1177 fail_command(conn, ctask, DID_BUS_BUSY << 16);
1178 }
1179 }
1180
1181 list_for_each_entry_safe(ctask, tmp, &conn->requeue, running) {
1182 if (lun == ctask->sc->device->lun || lun == -1) {
1183 debug_scsi("failing requeued sc %p itt 0x%x\n",
1184 ctask->sc, ctask->itt);
1185 fail_command(conn, ctask, DID_BUS_BUSY << 16);
1186 }
1187 }
1188
1189 /* fail all other running */
1190 list_for_each_entry_safe(ctask, tmp, &conn->run_list, running) {
1191 if (lun == ctask->sc->device->lun || lun == -1) {
1192 debug_scsi("failing in progress sc %p itt 0x%x\n",
1193 ctask->sc, ctask->itt);
1194 fail_command(conn, ctask, DID_BUS_BUSY << 16);
1195 }
1196 }
1197 }
1198
1199 static void iscsi_suspend_tx(struct iscsi_conn *conn)
1200 {
1201 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1202 scsi_flush_work(conn->session->host);
1203 }
1204
1205 static void iscsi_start_tx(struct iscsi_conn *conn)
1206 {
1207 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1208 scsi_queue_work(conn->session->host, &conn->xmitwork);
1209 }
1210
1211 static void iscsi_prep_abort_task_pdu(struct iscsi_cmd_task *ctask,
1212 struct iscsi_tm *hdr)
1213 {
1214 memset(hdr, 0, sizeof(*hdr));
1215 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
1216 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK;
1217 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
1218 memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
1219 hdr->rtt = ctask->hdr->itt;
1220 hdr->refcmdsn = ctask->hdr->cmdsn;
1221 }
1222
1223 int iscsi_eh_abort(struct scsi_cmnd *sc)
1224 {
1225 struct Scsi_Host *host = sc->device->host;
1226 struct iscsi_session *session = iscsi_hostdata(host->hostdata);
1227 struct iscsi_conn *conn;
1228 struct iscsi_cmd_task *ctask;
1229 struct iscsi_tm *hdr;
1230 int rc, age;
1231
1232 mutex_lock(&session->eh_mutex);
1233 spin_lock_bh(&session->lock);
1234 /*
1235 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
1236 * got the command.
1237 */
1238 if (!sc->SCp.ptr) {
1239 debug_scsi("sc never reached iscsi layer or it completed.\n");
1240 spin_unlock_bh(&session->lock);
1241 mutex_unlock(&session->eh_mutex);
1242 return SUCCESS;
1243 }
1244
1245 /*
1246 * If we are not logged in or we have started a new session
1247 * then let the host reset code handle this
1248 */
1249 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN ||
1250 sc->SCp.phase != session->age) {
1251 spin_unlock_bh(&session->lock);
1252 mutex_unlock(&session->eh_mutex);
1253 return FAILED;
1254 }
1255
1256 conn = session->leadconn;
1257 conn->eh_abort_cnt++;
1258 age = session->age;
1259
1260 ctask = (struct iscsi_cmd_task *)sc->SCp.ptr;
1261 debug_scsi("aborting [sc %p itt 0x%x]\n", sc, ctask->itt);
1262
1263 /* ctask completed before time out */
1264 if (!ctask->sc) {
1265 debug_scsi("sc completed while abort in progress\n");
1266 goto success;
1267 }
1268
1269 if (ctask->state == ISCSI_TASK_PENDING) {
1270 fail_command(conn, ctask, DID_ABORT << 16);
1271 goto success;
1272 }
1273
1274 /* only have one tmf outstanding at a time */
1275 if (conn->tmf_state != TMF_INITIAL)
1276 goto failed;
1277 conn->tmf_state = TMF_QUEUED;
1278
1279 hdr = &conn->tmhdr;
1280 iscsi_prep_abort_task_pdu(ctask, hdr);
1281
1282 if (iscsi_exec_task_mgmt_fn(conn, hdr, age)) {
1283 rc = FAILED;
1284 goto failed;
1285 }
1286
1287 switch (conn->tmf_state) {
1288 case TMF_SUCCESS:
1289 spin_unlock_bh(&session->lock);
1290 iscsi_suspend_tx(conn);
1291 /*
1292 * clean up task if aborted. grab the recv lock as a writer
1293 */
1294 write_lock_bh(conn->recv_lock);
1295 spin_lock(&session->lock);
1296 fail_command(conn, ctask, DID_ABORT << 16);
1297 conn->tmf_state = TMF_INITIAL;
1298 spin_unlock(&session->lock);
1299 write_unlock_bh(conn->recv_lock);
1300 iscsi_start_tx(conn);
1301 goto success_unlocked;
1302 case TMF_TIMEDOUT:
1303 spin_unlock_bh(&session->lock);
1304 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1305 goto failed_unlocked;
1306 case TMF_NOT_FOUND:
1307 if (!sc->SCp.ptr) {
1308 conn->tmf_state = TMF_INITIAL;
1309 /* ctask completed before tmf abort response */
1310 debug_scsi("sc completed while abort in progress\n");
1311 goto success;
1312 }
1313 /* fall through */
1314 default:
1315 conn->tmf_state = TMF_INITIAL;
1316 goto failed;
1317 }
1318
1319 success:
1320 spin_unlock_bh(&session->lock);
1321 success_unlocked:
1322 debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
1323 mutex_unlock(&session->eh_mutex);
1324 return SUCCESS;
1325
1326 failed:
1327 spin_unlock_bh(&session->lock);
1328 failed_unlocked:
1329 debug_scsi("abort failed [sc %p itt 0x%x]\n", sc,
1330 ctask ? ctask->itt : 0);
1331 mutex_unlock(&session->eh_mutex);
1332 return FAILED;
1333 }
1334 EXPORT_SYMBOL_GPL(iscsi_eh_abort);
1335
1336 static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
1337 {
1338 memset(hdr, 0, sizeof(*hdr));
1339 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
1340 hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK;
1341 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
1342 int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun);
1343 hdr->rtt = ISCSI_RESERVED_TAG;
1344 }
1345
1346 int iscsi_eh_device_reset(struct scsi_cmnd *sc)
1347 {
1348 struct Scsi_Host *host = sc->device->host;
1349 struct iscsi_session *session = iscsi_hostdata(host->hostdata);
1350 struct iscsi_conn *conn;
1351 struct iscsi_tm *hdr;
1352 int rc = FAILED;
1353
1354 debug_scsi("LU Reset [sc %p lun %u]\n", sc, sc->device->lun);
1355
1356 mutex_lock(&session->eh_mutex);
1357 spin_lock_bh(&session->lock);
1358 /*
1359 * Just check if we are not logged in. We cannot check for
1360 * the phase because the reset could come from a ioctl.
1361 */
1362 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
1363 goto unlock;
1364 conn = session->leadconn;
1365
1366 /* only have one tmf outstanding at a time */
1367 if (conn->tmf_state != TMF_INITIAL)
1368 goto unlock;
1369 conn->tmf_state = TMF_QUEUED;
1370
1371 hdr = &conn->tmhdr;
1372 iscsi_prep_lun_reset_pdu(sc, hdr);
1373
1374 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age)) {
1375 rc = FAILED;
1376 goto unlock;
1377 }
1378
1379 switch (conn->tmf_state) {
1380 case TMF_SUCCESS:
1381 break;
1382 case TMF_TIMEDOUT:
1383 spin_unlock_bh(&session->lock);
1384 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1385 goto done;
1386 default:
1387 conn->tmf_state = TMF_INITIAL;
1388 goto unlock;
1389 }
1390
1391 rc = SUCCESS;
1392 spin_unlock_bh(&session->lock);
1393
1394 iscsi_suspend_tx(conn);
1395 /* need to grab the recv lock then session lock */
1396 write_lock_bh(conn->recv_lock);
1397 spin_lock(&session->lock);
1398 fail_all_commands(conn, sc->device->lun);
1399 conn->tmf_state = TMF_INITIAL;
1400 spin_unlock(&session->lock);
1401 write_unlock_bh(conn->recv_lock);
1402
1403 iscsi_start_tx(conn);
1404 goto done;
1405
1406 unlock:
1407 spin_unlock_bh(&session->lock);
1408 done:
1409 debug_scsi("iscsi_eh_device_reset %s\n",
1410 rc == SUCCESS ? "SUCCESS" : "FAILED");
1411 mutex_unlock(&session->eh_mutex);
1412 return rc;
1413 }
1414 EXPORT_SYMBOL_GPL(iscsi_eh_device_reset);
1415
1416 int
1417 iscsi_pool_init(struct iscsi_queue *q, int max, void ***items, int item_size)
1418 {
1419 int i;
1420
1421 *items = kmalloc(max * sizeof(void*), GFP_KERNEL);
1422 if (*items == NULL)
1423 return -ENOMEM;
1424
1425 q->max = max;
1426 q->pool = kmalloc(max * sizeof(void*), GFP_KERNEL);
1427 if (q->pool == NULL) {
1428 kfree(*items);
1429 return -ENOMEM;
1430 }
1431
1432 q->queue = kfifo_init((void*)q->pool, max * sizeof(void*),
1433 GFP_KERNEL, NULL);
1434 if (q->queue == ERR_PTR(-ENOMEM)) {
1435 kfree(q->pool);
1436 kfree(*items);
1437 return -ENOMEM;
1438 }
1439
1440 for (i = 0; i < max; i++) {
1441 q->pool[i] = kmalloc(item_size, GFP_KERNEL);
1442 if (q->pool[i] == NULL) {
1443 int j;
1444
1445 for (j = 0; j < i; j++)
1446 kfree(q->pool[j]);
1447
1448 kfifo_free(q->queue);
1449 kfree(q->pool);
1450 kfree(*items);
1451 return -ENOMEM;
1452 }
1453 memset(q->pool[i], 0, item_size);
1454 (*items)[i] = q->pool[i];
1455 __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*));
1456 }
1457 return 0;
1458 }
1459 EXPORT_SYMBOL_GPL(iscsi_pool_init);
1460
1461 void iscsi_pool_free(struct iscsi_queue *q, void **items)
1462 {
1463 int i;
1464
1465 for (i = 0; i < q->max; i++)
1466 kfree(items[i]);
1467 kfree(q->pool);
1468 kfree(items);
1469 }
1470 EXPORT_SYMBOL_GPL(iscsi_pool_free);
1471
1472 /*
1473 * iSCSI Session's hostdata organization:
1474 *
1475 * *------------------* <== hostdata_session(host->hostdata)
1476 * | ptr to class sess|
1477 * |------------------| <== iscsi_hostdata(host->hostdata)
1478 * | iscsi_session |
1479 * *------------------*
1480 */
1481
1482 #define hostdata_privsize(_sz) (sizeof(unsigned long) + _sz + \
1483 _sz % sizeof(unsigned long))
1484
1485 #define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata))
1486
1487 /**
1488 * iscsi_session_setup - create iscsi cls session and host and session
1489 * @scsit: scsi transport template
1490 * @iscsit: iscsi transport template
1491 * @cmds_max: scsi host can queue
1492 * @qdepth: scsi host cmds per lun
1493 * @cmd_task_size: LLD ctask private data size
1494 * @mgmt_task_size: LLD mtask private data size
1495 * @initial_cmdsn: initial CmdSN
1496 * @hostno: host no allocated
1497 *
1498 * This can be used by software iscsi_transports that allocate
1499 * a session per scsi host.
1500 **/
1501 struct iscsi_cls_session *
1502 iscsi_session_setup(struct iscsi_transport *iscsit,
1503 struct scsi_transport_template *scsit,
1504 uint16_t cmds_max, uint16_t qdepth,
1505 int cmd_task_size, int mgmt_task_size,
1506 uint32_t initial_cmdsn, uint32_t *hostno)
1507 {
1508 struct Scsi_Host *shost;
1509 struct iscsi_session *session;
1510 struct iscsi_cls_session *cls_session;
1511 int cmd_i;
1512
1513 if (qdepth > ISCSI_MAX_CMD_PER_LUN || qdepth < 1) {
1514 if (qdepth != 0)
1515 printk(KERN_ERR "iscsi: invalid queue depth of %d. "
1516 "Queue depth must be between 1 and %d.\n",
1517 qdepth, ISCSI_MAX_CMD_PER_LUN);
1518 qdepth = ISCSI_DEF_CMD_PER_LUN;
1519 }
1520
1521 if (cmds_max < 2 || (cmds_max & (cmds_max - 1)) ||
1522 cmds_max >= ISCSI_MGMT_ITT_OFFSET) {
1523 if (cmds_max != 0)
1524 printk(KERN_ERR "iscsi: invalid can_queue of %d. "
1525 "can_queue must be a power of 2 and between "
1526 "2 and %d - setting to %d.\n", cmds_max,
1527 ISCSI_MGMT_ITT_OFFSET, ISCSI_DEF_XMIT_CMDS_MAX);
1528 cmds_max = ISCSI_DEF_XMIT_CMDS_MAX;
1529 }
1530
1531 shost = scsi_host_alloc(iscsit->host_template,
1532 hostdata_privsize(sizeof(*session)));
1533 if (!shost)
1534 return NULL;
1535
1536 /* the iscsi layer takes one task for reserve */
1537 shost->can_queue = cmds_max - 1;
1538 shost->cmd_per_lun = qdepth;
1539 shost->max_id = 1;
1540 shost->max_channel = 0;
1541 shost->max_lun = iscsit->max_lun;
1542 shost->max_cmd_len = iscsit->max_cmd_len;
1543 shost->transportt = scsit;
1544 shost->transportt->create_work_queue = 1;
1545 *hostno = shost->host_no;
1546
1547 session = iscsi_hostdata(shost->hostdata);
1548 memset(session, 0, sizeof(struct iscsi_session));
1549 session->host = shost;
1550 session->state = ISCSI_STATE_FREE;
1551 session->mgmtpool_max = ISCSI_MGMT_CMDS_MAX;
1552 session->cmds_max = cmds_max;
1553 session->queued_cmdsn = session->cmdsn = initial_cmdsn;
1554 session->exp_cmdsn = initial_cmdsn + 1;
1555 session->max_cmdsn = initial_cmdsn + 1;
1556 session->max_r2t = 1;
1557 session->tt = iscsit;
1558 mutex_init(&session->eh_mutex);
1559
1560 /* initialize SCSI PDU commands pool */
1561 if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
1562 (void***)&session->cmds,
1563 cmd_task_size + sizeof(struct iscsi_cmd_task)))
1564 goto cmdpool_alloc_fail;
1565
1566 /* pre-format cmds pool with ITT */
1567 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
1568 struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
1569
1570 if (cmd_task_size)
1571 ctask->dd_data = &ctask[1];
1572 ctask->itt = cmd_i;
1573 ctask->hdr_max = sizeof(struct iscsi_cmd);
1574 INIT_LIST_HEAD(&ctask->running);
1575 }
1576
1577 spin_lock_init(&session->lock);
1578
1579 /* initialize immediate command pool */
1580 if (iscsi_pool_init(&session->mgmtpool, session->mgmtpool_max,
1581 (void***)&session->mgmt_cmds,
1582 mgmt_task_size + sizeof(struct iscsi_mgmt_task)))
1583 goto mgmtpool_alloc_fail;
1584
1585
1586 /* pre-format immediate cmds pool with ITT */
1587 for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) {
1588 struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i];
1589
1590 if (mgmt_task_size)
1591 mtask->dd_data = &mtask[1];
1592 mtask->itt = ISCSI_MGMT_ITT_OFFSET + cmd_i;
1593 INIT_LIST_HEAD(&mtask->running);
1594 }
1595
1596 if (scsi_add_host(shost, NULL))
1597 goto add_host_fail;
1598
1599 if (!try_module_get(iscsit->owner))
1600 goto cls_session_fail;
1601
1602 cls_session = iscsi_create_session(shost, iscsit, 0);
1603 if (!cls_session)
1604 goto module_put;
1605 *(unsigned long*)shost->hostdata = (unsigned long)cls_session;
1606
1607 return cls_session;
1608
1609 module_put:
1610 module_put(iscsit->owner);
1611 cls_session_fail:
1612 scsi_remove_host(shost);
1613 add_host_fail:
1614 iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
1615 mgmtpool_alloc_fail:
1616 iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
1617 cmdpool_alloc_fail:
1618 scsi_host_put(shost);
1619 return NULL;
1620 }
1621 EXPORT_SYMBOL_GPL(iscsi_session_setup);
1622
1623 /**
1624 * iscsi_session_teardown - destroy session, host, and cls_session
1625 * shost: scsi host
1626 *
1627 * This can be used by software iscsi_transports that allocate
1628 * a session per scsi host.
1629 **/
1630 void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
1631 {
1632 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
1633 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
1634 struct module *owner = cls_session->transport->owner;
1635
1636 iscsi_unblock_session(cls_session);
1637 scsi_remove_host(shost);
1638
1639 iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
1640 iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
1641
1642 kfree(session->password);
1643 kfree(session->password_in);
1644 kfree(session->username);
1645 kfree(session->username_in);
1646 kfree(session->targetname);
1647 kfree(session->netdev);
1648 kfree(session->hwaddress);
1649 kfree(session->initiatorname);
1650
1651 iscsi_destroy_session(cls_session);
1652 scsi_host_put(shost);
1653 module_put(owner);
1654 }
1655 EXPORT_SYMBOL_GPL(iscsi_session_teardown);
1656
1657 /**
1658 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
1659 * @cls_session: iscsi_cls_session
1660 * @conn_idx: cid
1661 **/
1662 struct iscsi_cls_conn *
1663 iscsi_conn_setup(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
1664 {
1665 struct iscsi_session *session = class_to_transport_session(cls_session);
1666 struct iscsi_conn *conn;
1667 struct iscsi_cls_conn *cls_conn;
1668 char *data;
1669
1670 cls_conn = iscsi_create_conn(cls_session, conn_idx);
1671 if (!cls_conn)
1672 return NULL;
1673 conn = cls_conn->dd_data;
1674 memset(conn, 0, sizeof(*conn));
1675
1676 conn->session = session;
1677 conn->cls_conn = cls_conn;
1678 conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
1679 conn->id = conn_idx;
1680 conn->exp_statsn = 0;
1681 conn->tmf_state = TMF_INITIAL;
1682 INIT_LIST_HEAD(&conn->run_list);
1683 INIT_LIST_HEAD(&conn->mgmt_run_list);
1684 INIT_LIST_HEAD(&conn->mgmtqueue);
1685 INIT_LIST_HEAD(&conn->xmitqueue);
1686 INIT_LIST_HEAD(&conn->requeue);
1687 INIT_WORK(&conn->xmitwork, iscsi_xmitworker);
1688
1689 /* allocate login_mtask used for the login/text sequences */
1690 spin_lock_bh(&session->lock);
1691 if (!__kfifo_get(session->mgmtpool.queue,
1692 (void*)&conn->login_mtask,
1693 sizeof(void*))) {
1694 spin_unlock_bh(&session->lock);
1695 goto login_mtask_alloc_fail;
1696 }
1697 spin_unlock_bh(&session->lock);
1698
1699 data = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN, GFP_KERNEL);
1700 if (!data)
1701 goto login_mtask_data_alloc_fail;
1702 conn->login_mtask->data = conn->data = data;
1703
1704 init_timer(&conn->tmf_timer);
1705 init_waitqueue_head(&conn->ehwait);
1706
1707 return cls_conn;
1708
1709 login_mtask_data_alloc_fail:
1710 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
1711 sizeof(void*));
1712 login_mtask_alloc_fail:
1713 iscsi_destroy_conn(cls_conn);
1714 return NULL;
1715 }
1716 EXPORT_SYMBOL_GPL(iscsi_conn_setup);
1717
1718 /**
1719 * iscsi_conn_teardown - teardown iscsi connection
1720 * cls_conn: iscsi class connection
1721 *
1722 * TODO: we may need to make this into a two step process
1723 * like scsi-mls remove + put host
1724 */
1725 void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
1726 {
1727 struct iscsi_conn *conn = cls_conn->dd_data;
1728 struct iscsi_session *session = conn->session;
1729 unsigned long flags;
1730
1731 spin_lock_bh(&session->lock);
1732 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
1733 if (session->leadconn == conn) {
1734 /*
1735 * leading connection? then give up on recovery.
1736 */
1737 session->state = ISCSI_STATE_TERMINATE;
1738 wake_up(&conn->ehwait);
1739 }
1740 spin_unlock_bh(&session->lock);
1741
1742 /*
1743 * Block until all in-progress commands for this connection
1744 * time out or fail.
1745 */
1746 for (;;) {
1747 spin_lock_irqsave(session->host->host_lock, flags);
1748 if (!session->host->host_busy) { /* OK for ERL == 0 */
1749 spin_unlock_irqrestore(session->host->host_lock, flags);
1750 break;
1751 }
1752 spin_unlock_irqrestore(session->host->host_lock, flags);
1753 msleep_interruptible(500);
1754 printk(KERN_INFO "iscsi: scsi conn_destroy(): host_busy %d "
1755 "host_failed %d\n", session->host->host_busy,
1756 session->host->host_failed);
1757 /*
1758 * force eh_abort() to unblock
1759 */
1760 wake_up(&conn->ehwait);
1761 }
1762
1763 /* flush queued up work because we free the connection below */
1764 iscsi_suspend_tx(conn);
1765
1766 spin_lock_bh(&session->lock);
1767 kfree(conn->data);
1768 kfree(conn->persistent_address);
1769 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
1770 sizeof(void*));
1771 if (session->leadconn == conn)
1772 session->leadconn = NULL;
1773 spin_unlock_bh(&session->lock);
1774
1775 iscsi_destroy_conn(cls_conn);
1776 }
1777 EXPORT_SYMBOL_GPL(iscsi_conn_teardown);
1778
1779 int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
1780 {
1781 struct iscsi_conn *conn = cls_conn->dd_data;
1782 struct iscsi_session *session = conn->session;
1783
1784 if (!session) {
1785 printk(KERN_ERR "iscsi: can't start unbound connection\n");
1786 return -EPERM;
1787 }
1788
1789 if ((session->imm_data_en || !session->initial_r2t_en) &&
1790 session->first_burst > session->max_burst) {
1791 printk("iscsi: invalid burst lengths: "
1792 "first_burst %d max_burst %d\n",
1793 session->first_burst, session->max_burst);
1794 return -EINVAL;
1795 }
1796
1797 spin_lock_bh(&session->lock);
1798 conn->c_stage = ISCSI_CONN_STARTED;
1799 session->state = ISCSI_STATE_LOGGED_IN;
1800 session->queued_cmdsn = session->cmdsn;
1801
1802 switch(conn->stop_stage) {
1803 case STOP_CONN_RECOVER:
1804 /*
1805 * unblock eh_abort() if it is blocked. re-try all
1806 * commands after successful recovery
1807 */
1808 conn->stop_stage = 0;
1809 conn->tmf_state = TMF_INITIAL;
1810 session->age++;
1811 spin_unlock_bh(&session->lock);
1812
1813 iscsi_unblock_session(session_to_cls(session));
1814 wake_up(&conn->ehwait);
1815 return 0;
1816 case STOP_CONN_TERM:
1817 conn->stop_stage = 0;
1818 break;
1819 default:
1820 break;
1821 }
1822 spin_unlock_bh(&session->lock);
1823
1824 return 0;
1825 }
1826 EXPORT_SYMBOL_GPL(iscsi_conn_start);
1827
1828 static void
1829 flush_control_queues(struct iscsi_session *session, struct iscsi_conn *conn)
1830 {
1831 struct iscsi_mgmt_task *mtask, *tmp;
1832
1833 /* handle pending */
1834 list_for_each_entry_safe(mtask, tmp, &conn->mgmtqueue, running) {
1835 debug_scsi("flushing pending mgmt task itt 0x%x\n", mtask->itt);
1836 list_del_init(&mtask->running);
1837 if (mtask == conn->login_mtask)
1838 continue;
1839 __kfifo_put(session->mgmtpool.queue, (void*)&mtask,
1840 sizeof(void*));
1841 }
1842
1843 /* handle running */
1844 list_for_each_entry_safe(mtask, tmp, &conn->mgmt_run_list, running) {
1845 debug_scsi("flushing running mgmt task itt 0x%x\n", mtask->itt);
1846 list_del_init(&mtask->running);
1847
1848 if (mtask == conn->login_mtask)
1849 continue;
1850 __kfifo_put(session->mgmtpool.queue, (void*)&mtask,
1851 sizeof(void*));
1852 }
1853
1854 conn->mtask = NULL;
1855 }
1856
1857 static void iscsi_start_session_recovery(struct iscsi_session *session,
1858 struct iscsi_conn *conn, int flag)
1859 {
1860 int old_stop_stage;
1861
1862 mutex_lock(&session->eh_mutex);
1863 spin_lock_bh(&session->lock);
1864 if (conn->stop_stage == STOP_CONN_TERM) {
1865 spin_unlock_bh(&session->lock);
1866 mutex_unlock(&session->eh_mutex);
1867 return;
1868 }
1869
1870 /*
1871 * The LLD either freed/unset the lock on us, or userspace called
1872 * stop but did not create a proper connection (connection was never
1873 * bound or it was unbound then stop was called).
1874 */
1875 if (!conn->recv_lock) {
1876 spin_unlock_bh(&session->lock);
1877 mutex_unlock(&session->eh_mutex);
1878 return;
1879 }
1880
1881 /*
1882 * When this is called for the in_login state, we only want to clean
1883 * up the login task and connection. We do not need to block and set
1884 * the recovery state again
1885 */
1886 if (flag == STOP_CONN_TERM)
1887 session->state = ISCSI_STATE_TERMINATE;
1888 else if (conn->stop_stage != STOP_CONN_RECOVER)
1889 session->state = ISCSI_STATE_IN_RECOVERY;
1890
1891 old_stop_stage = conn->stop_stage;
1892 conn->stop_stage = flag;
1893 conn->c_stage = ISCSI_CONN_STOPPED;
1894 spin_unlock_bh(&session->lock);
1895
1896 iscsi_suspend_tx(conn);
1897
1898 write_lock_bh(conn->recv_lock);
1899 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
1900 write_unlock_bh(conn->recv_lock);
1901
1902 /*
1903 * for connection level recovery we should not calculate
1904 * header digest. conn->hdr_size used for optimization
1905 * in hdr_extract() and will be re-negotiated at
1906 * set_param() time.
1907 */
1908 if (flag == STOP_CONN_RECOVER) {
1909 conn->hdrdgst_en = 0;
1910 conn->datadgst_en = 0;
1911 if (session->state == ISCSI_STATE_IN_RECOVERY &&
1912 old_stop_stage != STOP_CONN_RECOVER) {
1913 debug_scsi("blocking session\n");
1914 iscsi_block_session(session_to_cls(session));
1915 }
1916 }
1917
1918 /*
1919 * flush queues.
1920 */
1921 spin_lock_bh(&session->lock);
1922 fail_all_commands(conn, -1);
1923 flush_control_queues(session, conn);
1924 spin_unlock_bh(&session->lock);
1925 mutex_unlock(&session->eh_mutex);
1926 }
1927
1928 void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
1929 {
1930 struct iscsi_conn *conn = cls_conn->dd_data;
1931 struct iscsi_session *session = conn->session;
1932
1933 switch (flag) {
1934 case STOP_CONN_RECOVER:
1935 case STOP_CONN_TERM:
1936 iscsi_start_session_recovery(session, conn, flag);
1937 break;
1938 default:
1939 printk(KERN_ERR "iscsi: invalid stop flag %d\n", flag);
1940 }
1941 }
1942 EXPORT_SYMBOL_GPL(iscsi_conn_stop);
1943
1944 int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
1945 struct iscsi_cls_conn *cls_conn, int is_leading)
1946 {
1947 struct iscsi_session *session = class_to_transport_session(cls_session);
1948 struct iscsi_conn *conn = cls_conn->dd_data;
1949
1950 spin_lock_bh(&session->lock);
1951 if (is_leading)
1952 session->leadconn = conn;
1953 spin_unlock_bh(&session->lock);
1954
1955 /*
1956 * Unblock xmitworker(), Login Phase will pass through.
1957 */
1958 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
1959 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1960 return 0;
1961 }
1962 EXPORT_SYMBOL_GPL(iscsi_conn_bind);
1963
1964
1965 int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
1966 enum iscsi_param param, char *buf, int buflen)
1967 {
1968 struct iscsi_conn *conn = cls_conn->dd_data;
1969 struct iscsi_session *session = conn->session;
1970 uint32_t value;
1971
1972 switch(param) {
1973 case ISCSI_PARAM_FAST_ABORT:
1974 sscanf(buf, "%d", &session->fast_abort);
1975 break;
1976 case ISCSI_PARAM_MAX_RECV_DLENGTH:
1977 sscanf(buf, "%d", &conn->max_recv_dlength);
1978 break;
1979 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
1980 sscanf(buf, "%d", &conn->max_xmit_dlength);
1981 break;
1982 case ISCSI_PARAM_HDRDGST_EN:
1983 sscanf(buf, "%d", &conn->hdrdgst_en);
1984 break;
1985 case ISCSI_PARAM_DATADGST_EN:
1986 sscanf(buf, "%d", &conn->datadgst_en);
1987 break;
1988 case ISCSI_PARAM_INITIAL_R2T_EN:
1989 sscanf(buf, "%d", &session->initial_r2t_en);
1990 break;
1991 case ISCSI_PARAM_MAX_R2T:
1992 sscanf(buf, "%d", &session->max_r2t);
1993 break;
1994 case ISCSI_PARAM_IMM_DATA_EN:
1995 sscanf(buf, "%d", &session->imm_data_en);
1996 break;
1997 case ISCSI_PARAM_FIRST_BURST:
1998 sscanf(buf, "%d", &session->first_burst);
1999 break;
2000 case ISCSI_PARAM_MAX_BURST:
2001 sscanf(buf, "%d", &session->max_burst);
2002 break;
2003 case ISCSI_PARAM_PDU_INORDER_EN:
2004 sscanf(buf, "%d", &session->pdu_inorder_en);
2005 break;
2006 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2007 sscanf(buf, "%d", &session->dataseq_inorder_en);
2008 break;
2009 case ISCSI_PARAM_ERL:
2010 sscanf(buf, "%d", &session->erl);
2011 break;
2012 case ISCSI_PARAM_IFMARKER_EN:
2013 sscanf(buf, "%d", &value);
2014 BUG_ON(value);
2015 break;
2016 case ISCSI_PARAM_OFMARKER_EN:
2017 sscanf(buf, "%d", &value);
2018 BUG_ON(value);
2019 break;
2020 case ISCSI_PARAM_EXP_STATSN:
2021 sscanf(buf, "%u", &conn->exp_statsn);
2022 break;
2023 case ISCSI_PARAM_USERNAME:
2024 kfree(session->username);
2025 session->username = kstrdup(buf, GFP_KERNEL);
2026 if (!session->username)
2027 return -ENOMEM;
2028 break;
2029 case ISCSI_PARAM_USERNAME_IN:
2030 kfree(session->username_in);
2031 session->username_in = kstrdup(buf, GFP_KERNEL);
2032 if (!session->username_in)
2033 return -ENOMEM;
2034 break;
2035 case ISCSI_PARAM_PASSWORD:
2036 kfree(session->password);
2037 session->password = kstrdup(buf, GFP_KERNEL);
2038 if (!session->password)
2039 return -ENOMEM;
2040 break;
2041 case ISCSI_PARAM_PASSWORD_IN:
2042 kfree(session->password_in);
2043 session->password_in = kstrdup(buf, GFP_KERNEL);
2044 if (!session->password_in)
2045 return -ENOMEM;
2046 break;
2047 case ISCSI_PARAM_TARGET_NAME:
2048 /* this should not change between logins */
2049 if (session->targetname)
2050 break;
2051
2052 session->targetname = kstrdup(buf, GFP_KERNEL);
2053 if (!session->targetname)
2054 return -ENOMEM;
2055 break;
2056 case ISCSI_PARAM_TPGT:
2057 sscanf(buf, "%d", &session->tpgt);
2058 break;
2059 case ISCSI_PARAM_PERSISTENT_PORT:
2060 sscanf(buf, "%d", &conn->persistent_port);
2061 break;
2062 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2063 /*
2064 * this is the address returned in discovery so it should
2065 * not change between logins.
2066 */
2067 if (conn->persistent_address)
2068 break;
2069
2070 conn->persistent_address = kstrdup(buf, GFP_KERNEL);
2071 if (!conn->persistent_address)
2072 return -ENOMEM;
2073 break;
2074 default:
2075 return -ENOSYS;
2076 }
2077
2078 return 0;
2079 }
2080 EXPORT_SYMBOL_GPL(iscsi_set_param);
2081
2082 int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
2083 enum iscsi_param param, char *buf)
2084 {
2085 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
2086 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
2087 int len;
2088
2089 switch(param) {
2090 case ISCSI_PARAM_FAST_ABORT:
2091 len = sprintf(buf, "%d\n", session->fast_abort);
2092 break;
2093 case ISCSI_PARAM_INITIAL_R2T_EN:
2094 len = sprintf(buf, "%d\n", session->initial_r2t_en);
2095 break;
2096 case ISCSI_PARAM_MAX_R2T:
2097 len = sprintf(buf, "%hu\n", session->max_r2t);
2098 break;
2099 case ISCSI_PARAM_IMM_DATA_EN:
2100 len = sprintf(buf, "%d\n", session->imm_data_en);
2101 break;
2102 case ISCSI_PARAM_FIRST_BURST:
2103 len = sprintf(buf, "%u\n", session->first_burst);
2104 break;
2105 case ISCSI_PARAM_MAX_BURST:
2106 len = sprintf(buf, "%u\n", session->max_burst);
2107 break;
2108 case ISCSI_PARAM_PDU_INORDER_EN:
2109 len = sprintf(buf, "%d\n", session->pdu_inorder_en);
2110 break;
2111 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2112 len = sprintf(buf, "%d\n", session->dataseq_inorder_en);
2113 break;
2114 case ISCSI_PARAM_ERL:
2115 len = sprintf(buf, "%d\n", session->erl);
2116 break;
2117 case ISCSI_PARAM_TARGET_NAME:
2118 len = sprintf(buf, "%s\n", session->targetname);
2119 break;
2120 case ISCSI_PARAM_TPGT:
2121 len = sprintf(buf, "%d\n", session->tpgt);
2122 break;
2123 case ISCSI_PARAM_USERNAME:
2124 len = sprintf(buf, "%s\n", session->username);
2125 break;
2126 case ISCSI_PARAM_USERNAME_IN:
2127 len = sprintf(buf, "%s\n", session->username_in);
2128 break;
2129 case ISCSI_PARAM_PASSWORD:
2130 len = sprintf(buf, "%s\n", session->password);
2131 break;
2132 case ISCSI_PARAM_PASSWORD_IN:
2133 len = sprintf(buf, "%s\n", session->password_in);
2134 break;
2135 default:
2136 return -ENOSYS;
2137 }
2138
2139 return len;
2140 }
2141 EXPORT_SYMBOL_GPL(iscsi_session_get_param);
2142
2143 int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
2144 enum iscsi_param param, char *buf)
2145 {
2146 struct iscsi_conn *conn = cls_conn->dd_data;
2147 int len;
2148
2149 switch(param) {
2150 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2151 len = sprintf(buf, "%u\n", conn->max_recv_dlength);
2152 break;
2153 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2154 len = sprintf(buf, "%u\n", conn->max_xmit_dlength);
2155 break;
2156 case ISCSI_PARAM_HDRDGST_EN:
2157 len = sprintf(buf, "%d\n", conn->hdrdgst_en);
2158 break;
2159 case ISCSI_PARAM_DATADGST_EN:
2160 len = sprintf(buf, "%d\n", conn->datadgst_en);
2161 break;
2162 case ISCSI_PARAM_IFMARKER_EN:
2163 len = sprintf(buf, "%d\n", conn->ifmarker_en);
2164 break;
2165 case ISCSI_PARAM_OFMARKER_EN:
2166 len = sprintf(buf, "%d\n", conn->ofmarker_en);
2167 break;
2168 case ISCSI_PARAM_EXP_STATSN:
2169 len = sprintf(buf, "%u\n", conn->exp_statsn);
2170 break;
2171 case ISCSI_PARAM_PERSISTENT_PORT:
2172 len = sprintf(buf, "%d\n", conn->persistent_port);
2173 break;
2174 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2175 len = sprintf(buf, "%s\n", conn->persistent_address);
2176 break;
2177 default:
2178 return -ENOSYS;
2179 }
2180
2181 return len;
2182 }
2183 EXPORT_SYMBOL_GPL(iscsi_conn_get_param);
2184
2185 int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2186 char *buf)
2187 {
2188 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
2189 int len;
2190
2191 switch (param) {
2192 case ISCSI_HOST_PARAM_NETDEV_NAME:
2193 if (!session->netdev)
2194 len = sprintf(buf, "%s\n", "default");
2195 else
2196 len = sprintf(buf, "%s\n", session->netdev);
2197 break;
2198 case ISCSI_HOST_PARAM_HWADDRESS:
2199 if (!session->hwaddress)
2200 len = sprintf(buf, "%s\n", "default");
2201 else
2202 len = sprintf(buf, "%s\n", session->hwaddress);
2203 break;
2204 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2205 if (!session->initiatorname)
2206 len = sprintf(buf, "%s\n", "unknown");
2207 else
2208 len = sprintf(buf, "%s\n", session->initiatorname);
2209 break;
2210
2211 default:
2212 return -ENOSYS;
2213 }
2214
2215 return len;
2216 }
2217 EXPORT_SYMBOL_GPL(iscsi_host_get_param);
2218
2219 int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2220 char *buf, int buflen)
2221 {
2222 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
2223
2224 switch (param) {
2225 case ISCSI_HOST_PARAM_NETDEV_NAME:
2226 if (!session->netdev)
2227 session->netdev = kstrdup(buf, GFP_KERNEL);
2228 break;
2229 case ISCSI_HOST_PARAM_HWADDRESS:
2230 if (!session->hwaddress)
2231 session->hwaddress = kstrdup(buf, GFP_KERNEL);
2232 break;
2233 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2234 if (!session->initiatorname)
2235 session->initiatorname = kstrdup(buf, GFP_KERNEL);
2236 break;
2237 default:
2238 return -ENOSYS;
2239 }
2240
2241 return 0;
2242 }
2243 EXPORT_SYMBOL_GPL(iscsi_host_set_param);
2244
2245 MODULE_AUTHOR("Mike Christie");
2246 MODULE_DESCRIPTION("iSCSI library functions");
2247 MODULE_LICENSE("GPL");
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