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[Bluetooth] Add missing stat.byte_rx counter modification
[linux-2.6/linux-2.6-openrd.git] / drivers / scsi / libiscsi.c
blob5606d1e62978433e7ca763e917b15e1c8af4c8e6
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 __kfifo_len(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 (sc->sc_data_direction == DMA_TO_DEVICE)
295 goto out;
296
297 if (rhdr->flags & ISCSI_FLAG_CMD_UNDERFLOW) {
298 int res_count = be32_to_cpu(rhdr->residual_count);
299
300 if (res_count > 0 && res_count <= scsi_bufflen(sc))
301 scsi_set_resid(sc, res_count);
302 else
303 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
304 } else if (rhdr->flags & ISCSI_FLAG_CMD_BIDI_UNDERFLOW)
305 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
306 else if (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW)
307 scsi_set_resid(sc, be32_to_cpu(rhdr->residual_count));
308
309 out:
310 debug_scsi("done [sc %lx res %d itt 0x%x]\n",
311 (long)sc, sc->result, ctask->itt);
312 conn->scsirsp_pdus_cnt++;
313
314 __iscsi_put_ctask(ctask);
315 }
316
317 static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
318 {
319 struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr;
320
321 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
322 conn->tmfrsp_pdus_cnt++;
323
324 if (conn->tmabort_state != TMABORT_INITIAL)
325 return;
326
327 if (tmf->response == ISCSI_TMF_RSP_COMPLETE)
328 conn->tmabort_state = TMABORT_SUCCESS;
329 else if (tmf->response == ISCSI_TMF_RSP_NO_TASK)
330 conn->tmabort_state = TMABORT_NOT_FOUND;
331 else
332 conn->tmabort_state = TMABORT_FAILED;
333 wake_up(&conn->ehwait);
334 }
335
336 static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
337 char *data, int datalen)
338 {
339 struct iscsi_reject *reject = (struct iscsi_reject *)hdr;
340 struct iscsi_hdr rejected_pdu;
341 uint32_t itt;
342
343 conn->exp_statsn = be32_to_cpu(reject->statsn) + 1;
344
345 if (reject->reason == ISCSI_REASON_DATA_DIGEST_ERROR) {
346 if (ntoh24(reject->dlength) > datalen)
347 return ISCSI_ERR_PROTO;
348
349 if (ntoh24(reject->dlength) >= sizeof(struct iscsi_hdr)) {
350 memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr));
351 itt = get_itt(rejected_pdu.itt);
352 printk(KERN_ERR "itt 0x%x had pdu (op 0x%x) rejected "
353 "due to DataDigest error.\n", itt,
354 rejected_pdu.opcode);
355 }
356 }
357 return 0;
358 }
359
360 /**
361 * __iscsi_complete_pdu - complete pdu
362 * @conn: iscsi conn
363 * @hdr: iscsi header
364 * @data: data buffer
365 * @datalen: len of data buffer
366 *
367 * Completes pdu processing by freeing any resources allocated at
368 * queuecommand or send generic. session lock must be held and verify
369 * itt must have been called.
370 */
371 int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
372 char *data, int datalen)
373 {
374 struct iscsi_session *session = conn->session;
375 int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0;
376 struct iscsi_cmd_task *ctask;
377 struct iscsi_mgmt_task *mtask;
378 uint32_t itt;
379
380 if (hdr->itt != RESERVED_ITT)
381 itt = get_itt(hdr->itt);
382 else
383 itt = ~0U;
384
385 if (itt < session->cmds_max) {
386 ctask = session->cmds[itt];
387
388 debug_scsi("cmdrsp [op 0x%x cid %d itt 0x%x len %d]\n",
389 opcode, conn->id, ctask->itt, datalen);
390
391 switch(opcode) {
392 case ISCSI_OP_SCSI_CMD_RSP:
393 BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
394 iscsi_scsi_cmd_rsp(conn, hdr, ctask, data,
395 datalen);
396 break;
397 case ISCSI_OP_SCSI_DATA_IN:
398 BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
399 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
400 conn->scsirsp_pdus_cnt++;
401 __iscsi_put_ctask(ctask);
402 }
403 break;
404 case ISCSI_OP_R2T:
405 /* LLD handles this for now */
406 break;
407 default:
408 rc = ISCSI_ERR_BAD_OPCODE;
409 break;
410 }
411 } else if (itt >= ISCSI_MGMT_ITT_OFFSET &&
412 itt < ISCSI_MGMT_ITT_OFFSET + session->mgmtpool_max) {
413 mtask = session->mgmt_cmds[itt - ISCSI_MGMT_ITT_OFFSET];
414
415 debug_scsi("immrsp [op 0x%x cid %d itt 0x%x len %d]\n",
416 opcode, conn->id, mtask->itt, datalen);
417
418 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
419 switch(opcode) {
420 case ISCSI_OP_LOGOUT_RSP:
421 if (datalen) {
422 rc = ISCSI_ERR_PROTO;
423 break;
424 }
425 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
426 /* fall through */
427 case ISCSI_OP_LOGIN_RSP:
428 case ISCSI_OP_TEXT_RSP:
429 /*
430 * login related PDU's exp_statsn is handled in
431 * userspace
432 */
433 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
434 rc = ISCSI_ERR_CONN_FAILED;
435 list_del(&mtask->running);
436 if (conn->login_mtask != mtask)
437 __kfifo_put(session->mgmtpool.queue,
438 (void*)&mtask, sizeof(void*));
439 break;
440 case ISCSI_OP_SCSI_TMFUNC_RSP:
441 if (datalen) {
442 rc = ISCSI_ERR_PROTO;
443 break;
444 }
445
446 iscsi_tmf_rsp(conn, hdr);
447 break;
448 case ISCSI_OP_NOOP_IN:
449 if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) {
450 rc = ISCSI_ERR_PROTO;
451 break;
452 }
453 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
454
455 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
456 rc = ISCSI_ERR_CONN_FAILED;
457 list_del(&mtask->running);
458 if (conn->login_mtask != mtask)
459 __kfifo_put(session->mgmtpool.queue,
460 (void*)&mtask, sizeof(void*));
461 break;
462 default:
463 rc = ISCSI_ERR_BAD_OPCODE;
464 break;
465 }
466 } else if (itt == ~0U) {
467 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
468
469 switch(opcode) {
470 case ISCSI_OP_NOOP_IN:
471 if (datalen) {
472 rc = ISCSI_ERR_PROTO;
473 break;
474 }
475
476 if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG))
477 break;
478
479 if (iscsi_recv_pdu(conn->cls_conn, hdr, NULL, 0))
480 rc = ISCSI_ERR_CONN_FAILED;
481 break;
482 case ISCSI_OP_REJECT:
483 rc = iscsi_handle_reject(conn, hdr, data, datalen);
484 break;
485 case ISCSI_OP_ASYNC_EVENT:
486 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
487 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
488 rc = ISCSI_ERR_CONN_FAILED;
489 break;
490 default:
491 rc = ISCSI_ERR_BAD_OPCODE;
492 break;
493 }
494 } else
495 rc = ISCSI_ERR_BAD_ITT;
496
497 return rc;
498 }
499 EXPORT_SYMBOL_GPL(__iscsi_complete_pdu);
500
501 int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
502 char *data, int datalen)
503 {
504 int rc;
505
506 spin_lock(&conn->session->lock);
507 rc = __iscsi_complete_pdu(conn, hdr, data, datalen);
508 spin_unlock(&conn->session->lock);
509 return rc;
510 }
511 EXPORT_SYMBOL_GPL(iscsi_complete_pdu);
512
513 /* verify itt (itt encoding: age+cid+itt) */
514 int iscsi_verify_itt(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
515 uint32_t *ret_itt)
516 {
517 struct iscsi_session *session = conn->session;
518 struct iscsi_cmd_task *ctask;
519 uint32_t itt;
520
521 if (hdr->itt != RESERVED_ITT) {
522 if (((__force u32)hdr->itt & ISCSI_AGE_MASK) !=
523 (session->age << ISCSI_AGE_SHIFT)) {
524 printk(KERN_ERR "iscsi: received itt %x expected "
525 "session age (%x)\n", (__force u32)hdr->itt,
526 session->age & ISCSI_AGE_MASK);
527 return ISCSI_ERR_BAD_ITT;
528 }
529
530 if (((__force u32)hdr->itt & ISCSI_CID_MASK) !=
531 (conn->id << ISCSI_CID_SHIFT)) {
532 printk(KERN_ERR "iscsi: received itt %x, expected "
533 "CID (%x)\n", (__force u32)hdr->itt, conn->id);
534 return ISCSI_ERR_BAD_ITT;
535 }
536 itt = get_itt(hdr->itt);
537 } else
538 itt = ~0U;
539
540 if (itt < session->cmds_max) {
541 ctask = session->cmds[itt];
542
543 if (!ctask->sc) {
544 printk(KERN_INFO "iscsi: dropping ctask with "
545 "itt 0x%x\n", ctask->itt);
546 /* force drop */
547 return ISCSI_ERR_NO_SCSI_CMD;
548 }
549
550 if (ctask->sc->SCp.phase != session->age) {
551 printk(KERN_ERR "iscsi: ctask's session age %d, "
552 "expected %d\n", ctask->sc->SCp.phase,
553 session->age);
554 return ISCSI_ERR_SESSION_FAILED;
555 }
556 }
557
558 *ret_itt = itt;
559 return 0;
560 }
561 EXPORT_SYMBOL_GPL(iscsi_verify_itt);
562
563 void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
564 {
565 struct iscsi_session *session = conn->session;
566 unsigned long flags;
567
568 spin_lock_irqsave(&session->lock, flags);
569 if (session->state == ISCSI_STATE_FAILED) {
570 spin_unlock_irqrestore(&session->lock, flags);
571 return;
572 }
573
574 if (conn->stop_stage == 0)
575 session->state = ISCSI_STATE_FAILED;
576 spin_unlock_irqrestore(&session->lock, flags);
577 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
578 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
579 iscsi_conn_error(conn->cls_conn, err);
580 }
581 EXPORT_SYMBOL_GPL(iscsi_conn_failure);
582
583 static void iscsi_prep_mtask(struct iscsi_conn *conn,
584 struct iscsi_mgmt_task *mtask)
585 {
586 struct iscsi_session *session = conn->session;
587 struct iscsi_hdr *hdr = mtask->hdr;
588 struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
589
590 if (hdr->opcode != (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) &&
591 hdr->opcode != (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
592 nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
593 /*
594 * pre-format CmdSN for outgoing PDU.
595 */
596 nop->cmdsn = cpu_to_be32(session->cmdsn);
597 if (hdr->itt != RESERVED_ITT) {
598 hdr->itt = build_itt(mtask->itt, conn->id, session->age);
599 /*
600 * TODO: We always use immediate, so we never hit this.
601 * If we start to send tmfs or nops as non-immediate then
602 * we should start checking the cmdsn numbers for mgmt tasks.
603 */
604 if (conn->c_stage == ISCSI_CONN_STARTED &&
605 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
606 session->queued_cmdsn++;
607 session->cmdsn++;
608 }
609 }
610
611 if (session->tt->init_mgmt_task)
612 session->tt->init_mgmt_task(conn, mtask);
613
614 debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n",
615 hdr->opcode, hdr->itt, mtask->data_count);
616 }
617
618 static int iscsi_xmit_mtask(struct iscsi_conn *conn)
619 {
620 struct iscsi_hdr *hdr = conn->mtask->hdr;
621 int rc, was_logout = 0;
622
623 spin_unlock_bh(&conn->session->lock);
624 if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT) {
625 conn->session->state = ISCSI_STATE_IN_RECOVERY;
626 iscsi_block_session(session_to_cls(conn->session));
627 was_logout = 1;
628 }
629 rc = conn->session->tt->xmit_mgmt_task(conn, conn->mtask);
630 spin_lock_bh(&conn->session->lock);
631 if (rc)
632 return rc;
633
634 /* done with this in-progress mtask */
635 conn->mtask = NULL;
636
637 if (was_logout) {
638 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
639 return -ENODATA;
640 }
641 return 0;
642 }
643
644 static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn)
645 {
646 struct iscsi_session *session = conn->session;
647
648 /*
649 * Check for iSCSI window and take care of CmdSN wrap-around
650 */
651 if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) {
652 debug_scsi("iSCSI CmdSN closed. ExpCmdSn %u MaxCmdSN %u "
653 "CmdSN %u/%u\n", session->exp_cmdsn,
654 session->max_cmdsn, session->cmdsn,
655 session->queued_cmdsn);
656 return -ENOSPC;
657 }
658 return 0;
659 }
660
661 static int iscsi_xmit_ctask(struct iscsi_conn *conn)
662 {
663 struct iscsi_cmd_task *ctask = conn->ctask;
664 int rc = 0;
665
666 /*
667 * serialize with TMF AbortTask
668 */
669 if (ctask->state == ISCSI_TASK_ABORTING)
670 goto done;
671
672 __iscsi_get_ctask(ctask);
673 spin_unlock_bh(&conn->session->lock);
674 rc = conn->session->tt->xmit_cmd_task(conn, ctask);
675 spin_lock_bh(&conn->session->lock);
676 __iscsi_put_ctask(ctask);
677
678 done:
679 if (!rc)
680 /* done with this ctask */
681 conn->ctask = NULL;
682 return rc;
683 }
684
685 /**
686 * iscsi_data_xmit - xmit any command into the scheduled connection
687 * @conn: iscsi connection
688 *
689 * Notes:
690 * The function can return -EAGAIN in which case the caller must
691 * re-schedule it again later or recover. '0' return code means
692 * successful xmit.
693 **/
694 static int iscsi_data_xmit(struct iscsi_conn *conn)
695 {
696 int rc = 0;
697
698 spin_lock_bh(&conn->session->lock);
699 if (unlikely(conn->suspend_tx)) {
700 debug_scsi("conn %d Tx suspended!\n", conn->id);
701 spin_unlock_bh(&conn->session->lock);
702 return -ENODATA;
703 }
704
705 if (conn->ctask) {
706 rc = iscsi_xmit_ctask(conn);
707 if (rc)
708 goto again;
709 }
710
711 if (conn->mtask) {
712 rc = iscsi_xmit_mtask(conn);
713 if (rc)
714 goto again;
715 }
716
717 /*
718 * process mgmt pdus like nops before commands since we should
719 * only have one nop-out as a ping from us and targets should not
720 * overflow us with nop-ins
721 */
722 check_mgmt:
723 while (__kfifo_get(conn->mgmtqueue, (void*)&conn->mtask,
724 sizeof(void*))) {
725 iscsi_prep_mtask(conn, conn->mtask);
726 list_add_tail(&conn->mtask->running, &conn->mgmt_run_list);
727 rc = iscsi_xmit_mtask(conn);
728 if (rc)
729 goto again;
730 }
731
732 /* process command queue */
733 while (!list_empty(&conn->xmitqueue)) {
734 /*
735 * iscsi tcp may readd the task to the xmitqueue to send
736 * write data
737 */
738 conn->ctask = list_entry(conn->xmitqueue.next,
739 struct iscsi_cmd_task, running);
740 if (conn->ctask->state == ISCSI_TASK_PENDING) {
741 iscsi_prep_scsi_cmd_pdu(conn->ctask);
742 conn->session->tt->init_cmd_task(conn->ctask);
743 }
744 conn->ctask->state = ISCSI_TASK_RUNNING;
745 list_move_tail(conn->xmitqueue.next, &conn->run_list);
746 rc = iscsi_xmit_ctask(conn);
747 if (rc)
748 goto again;
749 /*
750 * we could continuously get new ctask requests so
751 * we need to check the mgmt queue for nops that need to
752 * be sent to aviod starvation
753 */
754 if (__kfifo_len(conn->mgmtqueue))
755 goto check_mgmt;
756 }
757 spin_unlock_bh(&conn->session->lock);
758 return -ENODATA;
759
760 again:
761 if (unlikely(conn->suspend_tx))
762 rc = -ENODATA;
763 spin_unlock_bh(&conn->session->lock);
764 return rc;
765 }
766
767 static void iscsi_xmitworker(struct work_struct *work)
768 {
769 struct iscsi_conn *conn =
770 container_of(work, struct iscsi_conn, xmitwork);
771 int rc;
772 /*
773 * serialize Xmit worker on a per-connection basis.
774 */
775 do {
776 rc = iscsi_data_xmit(conn);
777 } while (rc >= 0 || rc == -EAGAIN);
778 }
779
780 enum {
781 FAILURE_BAD_HOST = 1,
782 FAILURE_SESSION_FAILED,
783 FAILURE_SESSION_FREED,
784 FAILURE_WINDOW_CLOSED,
785 FAILURE_OOM,
786 FAILURE_SESSION_TERMINATE,
787 FAILURE_SESSION_IN_RECOVERY,
788 FAILURE_SESSION_RECOVERY_TIMEOUT,
789 };
790
791 int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
792 {
793 struct Scsi_Host *host;
794 int reason = 0;
795 struct iscsi_session *session;
796 struct iscsi_conn *conn;
797 struct iscsi_cmd_task *ctask = NULL;
798
799 sc->scsi_done = done;
800 sc->result = 0;
801 sc->SCp.ptr = NULL;
802
803 host = sc->device->host;
804 session = iscsi_hostdata(host->hostdata);
805
806 spin_lock(&session->lock);
807
808 /*
809 * ISCSI_STATE_FAILED is a temp. state. The recovery
810 * code will decide what is best to do with command queued
811 * during this time
812 */
813 if (session->state != ISCSI_STATE_LOGGED_IN &&
814 session->state != ISCSI_STATE_FAILED) {
815 /*
816 * to handle the race between when we set the recovery state
817 * and block the session we requeue here (commands could
818 * be entering our queuecommand while a block is starting
819 * up because the block code is not locked)
820 */
821 if (session->state == ISCSI_STATE_IN_RECOVERY) {
822 reason = FAILURE_SESSION_IN_RECOVERY;
823 goto reject;
824 }
825
826 if (session->state == ISCSI_STATE_RECOVERY_FAILED)
827 reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
828 else if (session->state == ISCSI_STATE_TERMINATE)
829 reason = FAILURE_SESSION_TERMINATE;
830 else
831 reason = FAILURE_SESSION_FREED;
832 goto fault;
833 }
834
835 conn = session->leadconn;
836 if (!conn) {
837 reason = FAILURE_SESSION_FREED;
838 goto fault;
839 }
840
841 if (iscsi_check_cmdsn_window_closed(conn)) {
842 reason = FAILURE_WINDOW_CLOSED;
843 goto reject;
844 }
845
846 if (!__kfifo_get(session->cmdpool.queue, (void*)&ctask,
847 sizeof(void*))) {
848 reason = FAILURE_OOM;
849 goto reject;
850 }
851 session->queued_cmdsn++;
852
853 sc->SCp.phase = session->age;
854 sc->SCp.ptr = (char *)ctask;
855
856 atomic_set(&ctask->refcount, 1);
857 ctask->state = ISCSI_TASK_PENDING;
858 ctask->mtask = NULL;
859 ctask->conn = conn;
860 ctask->sc = sc;
861 INIT_LIST_HEAD(&ctask->running);
862
863 list_add_tail(&ctask->running, &conn->xmitqueue);
864 spin_unlock(&session->lock);
865
866 scsi_queue_work(host, &conn->xmitwork);
867 return 0;
868
869 reject:
870 spin_unlock(&session->lock);
871 debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason);
872 return SCSI_MLQUEUE_HOST_BUSY;
873
874 fault:
875 spin_unlock(&session->lock);
876 printk(KERN_ERR "iscsi: cmd 0x%x is not queued (%d)\n",
877 sc->cmnd[0], reason);
878 sc->result = (DID_NO_CONNECT << 16);
879 scsi_set_resid(sc, scsi_bufflen(sc));
880 sc->scsi_done(sc);
881 return 0;
882 }
883 EXPORT_SYMBOL_GPL(iscsi_queuecommand);
884
885 int iscsi_change_queue_depth(struct scsi_device *sdev, int depth)
886 {
887 if (depth > ISCSI_MAX_CMD_PER_LUN)
888 depth = ISCSI_MAX_CMD_PER_LUN;
889 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
890 return sdev->queue_depth;
891 }
892 EXPORT_SYMBOL_GPL(iscsi_change_queue_depth);
893
894 static struct iscsi_mgmt_task *
895 __iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
896 char *data, uint32_t data_size)
897 {
898 struct iscsi_session *session = conn->session;
899 struct iscsi_mgmt_task *mtask;
900
901 if (session->state == ISCSI_STATE_TERMINATE)
902 return NULL;
903
904 if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) ||
905 hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
906 /*
907 * Login and Text are sent serially, in
908 * request-followed-by-response sequence.
909 * Same mtask can be used. Same ITT must be used.
910 * Note that login_mtask is preallocated at conn_create().
911 */
912 mtask = conn->login_mtask;
913 else {
914 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
915 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
916
917 if (!__kfifo_get(session->mgmtpool.queue,
918 (void*)&mtask, sizeof(void*)))
919 return NULL;
920 }
921
922 if (data_size) {
923 memcpy(mtask->data, data, data_size);
924 mtask->data_count = data_size;
925 } else
926 mtask->data_count = 0;
927
928 INIT_LIST_HEAD(&mtask->running);
929 memcpy(mtask->hdr, hdr, sizeof(struct iscsi_hdr));
930 __kfifo_put(conn->mgmtqueue, (void*)&mtask, sizeof(void*));
931 return mtask;
932 }
933
934 int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr,
935 char *data, uint32_t data_size)
936 {
937 struct iscsi_conn *conn = cls_conn->dd_data;
938 struct iscsi_session *session = conn->session;
939 int err = 0;
940
941 spin_lock_bh(&session->lock);
942 if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size))
943 err = -EPERM;
944 spin_unlock_bh(&session->lock);
945 scsi_queue_work(session->host, &conn->xmitwork);
946 return err;
947 }
948 EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu);
949
950 void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
951 {
952 struct iscsi_session *session = class_to_transport_session(cls_session);
953 struct iscsi_conn *conn = session->leadconn;
954
955 spin_lock_bh(&session->lock);
956 if (session->state != ISCSI_STATE_LOGGED_IN) {
957 session->state = ISCSI_STATE_RECOVERY_FAILED;
958 if (conn)
959 wake_up(&conn->ehwait);
960 }
961 spin_unlock_bh(&session->lock);
962 }
963 EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
964
965 int iscsi_eh_host_reset(struct scsi_cmnd *sc)
966 {
967 struct Scsi_Host *host = sc->device->host;
968 struct iscsi_session *session = iscsi_hostdata(host->hostdata);
969 struct iscsi_conn *conn = session->leadconn;
970 int fail_session = 0;
971
972 spin_lock_bh(&session->lock);
973 if (session->state == ISCSI_STATE_TERMINATE) {
974 failed:
975 debug_scsi("failing host reset: session terminated "
976 "[CID %d age %d]\n", conn->id, session->age);
977 spin_unlock_bh(&session->lock);
978 return FAILED;
979 }
980
981 if (sc->SCp.phase == session->age) {
982 debug_scsi("failing connection CID %d due to SCSI host reset\n",
983 conn->id);
984 fail_session = 1;
985 }
986 spin_unlock_bh(&session->lock);
987
988 /*
989 * we drop the lock here but the leadconn cannot be destoyed while
990 * we are in the scsi eh
991 */
992 if (fail_session)
993 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
994
995 debug_scsi("iscsi_eh_host_reset wait for relogin\n");
996 wait_event_interruptible(conn->ehwait,
997 session->state == ISCSI_STATE_TERMINATE ||
998 session->state == ISCSI_STATE_LOGGED_IN ||
999 session->state == ISCSI_STATE_RECOVERY_FAILED);
1000 if (signal_pending(current))
1001 flush_signals(current);
1002
1003 spin_lock_bh(&session->lock);
1004 if (session->state == ISCSI_STATE_LOGGED_IN)
1005 printk(KERN_INFO "iscsi: host reset succeeded\n");
1006 else
1007 goto failed;
1008 spin_unlock_bh(&session->lock);
1009
1010 return SUCCESS;
1011 }
1012 EXPORT_SYMBOL_GPL(iscsi_eh_host_reset);
1013
1014 static void iscsi_tmabort_timedout(unsigned long data)
1015 {
1016 struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)data;
1017 struct iscsi_conn *conn = ctask->conn;
1018 struct iscsi_session *session = conn->session;
1019
1020 spin_lock(&session->lock);
1021 if (conn->tmabort_state == TMABORT_INITIAL) {
1022 conn->tmabort_state = TMABORT_TIMEDOUT;
1023 debug_scsi("tmabort timedout [sc %p itt 0x%x]\n",
1024 ctask->sc, ctask->itt);
1025 /* unblock eh_abort() */
1026 wake_up(&conn->ehwait);
1027 }
1028 spin_unlock(&session->lock);
1029 }
1030
1031 static int iscsi_exec_abort_task(struct scsi_cmnd *sc,
1032 struct iscsi_cmd_task *ctask)
1033 {
1034 struct iscsi_conn *conn = ctask->conn;
1035 struct iscsi_session *session = conn->session;
1036 struct iscsi_tm *hdr = &conn->tmhdr;
1037
1038 /*
1039 * ctask timed out but session is OK requests must be serialized.
1040 */
1041 memset(hdr, 0, sizeof(struct iscsi_tm));
1042 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
1043 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK;
1044 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
1045 memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
1046 hdr->rtt = ctask->hdr->itt;
1047 hdr->refcmdsn = ctask->hdr->cmdsn;
1048
1049 ctask->mtask = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr,
1050 NULL, 0);
1051 if (!ctask->mtask) {
1052 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1053 debug_scsi("abort sent failure [itt 0x%x]\n", ctask->itt);
1054 return -EPERM;
1055 }
1056 ctask->state = ISCSI_TASK_ABORTING;
1057
1058 debug_scsi("abort sent [itt 0x%x]\n", ctask->itt);
1059
1060 if (conn->tmabort_state == TMABORT_INITIAL) {
1061 conn->tmfcmd_pdus_cnt++;
1062 conn->tmabort_timer.expires = 20*HZ + jiffies;
1063 conn->tmabort_timer.function = iscsi_tmabort_timedout;
1064 conn->tmabort_timer.data = (unsigned long)ctask;
1065 add_timer(&conn->tmabort_timer);
1066 debug_scsi("abort set timeout [itt 0x%x]\n", ctask->itt);
1067 }
1068 spin_unlock_bh(&session->lock);
1069 scsi_queue_work(session->host, &conn->xmitwork);
1070
1071 /*
1072 * block eh thread until:
1073 *
1074 * 1) abort response
1075 * 2) abort timeout
1076 * 3) session is terminated or restarted or userspace has
1077 * given up on recovery
1078 */
1079 wait_event_interruptible(conn->ehwait,
1080 sc->SCp.phase != session->age ||
1081 session->state != ISCSI_STATE_LOGGED_IN ||
1082 conn->tmabort_state != TMABORT_INITIAL);
1083 if (signal_pending(current))
1084 flush_signals(current);
1085 del_timer_sync(&conn->tmabort_timer);
1086 spin_lock_bh(&session->lock);
1087 return 0;
1088 }
1089
1090 /*
1091 * session lock must be held
1092 */
1093 static struct iscsi_mgmt_task *
1094 iscsi_remove_mgmt_task(struct kfifo *fifo, uint32_t itt)
1095 {
1096 int i, nr_tasks = __kfifo_len(fifo) / sizeof(void*);
1097 struct iscsi_mgmt_task *task;
1098
1099 debug_scsi("searching %d tasks\n", nr_tasks);
1100
1101 for (i = 0; i < nr_tasks; i++) {
1102 __kfifo_get(fifo, (void*)&task, sizeof(void*));
1103 debug_scsi("check task %u\n", task->itt);
1104
1105 if (task->itt == itt) {
1106 debug_scsi("matched task\n");
1107 return task;
1108 }
1109
1110 __kfifo_put(fifo, (void*)&task, sizeof(void*));
1111 }
1112 return NULL;
1113 }
1114
1115 static int iscsi_ctask_mtask_cleanup(struct iscsi_cmd_task *ctask)
1116 {
1117 struct iscsi_conn *conn = ctask->conn;
1118 struct iscsi_session *session = conn->session;
1119
1120 if (!ctask->mtask)
1121 return -EINVAL;
1122
1123 if (!iscsi_remove_mgmt_task(conn->mgmtqueue, ctask->mtask->itt))
1124 list_del(&ctask->mtask->running);
1125 __kfifo_put(session->mgmtpool.queue, (void*)&ctask->mtask,
1126 sizeof(void*));
1127 ctask->mtask = NULL;
1128 return 0;
1129 }
1130
1131 /*
1132 * session lock must be held
1133 */
1134 static void fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
1135 int err)
1136 {
1137 struct scsi_cmnd *sc;
1138
1139 sc = ctask->sc;
1140 if (!sc)
1141 return;
1142
1143 if (ctask->state == ISCSI_TASK_PENDING)
1144 /*
1145 * cmd never made it to the xmit thread, so we should not count
1146 * the cmd in the sequencing
1147 */
1148 conn->session->queued_cmdsn--;
1149 else
1150 conn->session->tt->cleanup_cmd_task(conn, ctask);
1151 iscsi_ctask_mtask_cleanup(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 int iscsi_eh_abort(struct scsi_cmnd *sc)
1162 {
1163 struct iscsi_cmd_task *ctask;
1164 struct iscsi_conn *conn;
1165 struct iscsi_session *session;
1166 int rc;
1167
1168 /*
1169 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
1170 * got the command.
1171 */
1172 if (!sc->SCp.ptr) {
1173 debug_scsi("sc never reached iscsi layer or it completed.\n");
1174 return SUCCESS;
1175 }
1176
1177 ctask = (struct iscsi_cmd_task *)sc->SCp.ptr;
1178 conn = ctask->conn;
1179 session = conn->session;
1180
1181 conn->eh_abort_cnt++;
1182 debug_scsi("aborting [sc %p itt 0x%x]\n", sc, ctask->itt);
1183
1184 spin_lock_bh(&session->lock);
1185
1186 /*
1187 * If we are not logged in or we have started a new session
1188 * then let the host reset code handle this
1189 */
1190 if (session->state != ISCSI_STATE_LOGGED_IN ||
1191 sc->SCp.phase != session->age)
1192 goto failed;
1193
1194 /* ctask completed before time out */
1195 if (!ctask->sc) {
1196 debug_scsi("sc completed while abort in progress\n");
1197 goto success;
1198 }
1199
1200 /* what should we do here ? */
1201 if (conn->ctask == ctask) {
1202 printk(KERN_INFO "iscsi: sc %p itt 0x%x partially sent. "
1203 "Failing abort\n", sc, ctask->itt);
1204 goto failed;
1205 }
1206
1207 if (ctask->state == ISCSI_TASK_PENDING) {
1208 fail_command(conn, ctask, DID_ABORT << 16);
1209 goto success;
1210 }
1211
1212 conn->tmabort_state = TMABORT_INITIAL;
1213 rc = iscsi_exec_abort_task(sc, ctask);
1214 if (rc || sc->SCp.phase != session->age ||
1215 session->state != ISCSI_STATE_LOGGED_IN)
1216 goto failed;
1217 iscsi_ctask_mtask_cleanup(ctask);
1218
1219 switch (conn->tmabort_state) {
1220 case TMABORT_SUCCESS:
1221 spin_unlock_bh(&session->lock);
1222 /*
1223 * clean up task if aborted. grab the recv lock as a writer
1224 */
1225 write_lock_bh(conn->recv_lock);
1226 spin_lock(&session->lock);
1227 fail_command(conn, ctask, DID_ABORT << 16);
1228 spin_unlock(&session->lock);
1229 write_unlock_bh(conn->recv_lock);
1230 /*
1231 * make sure xmit thread is not still touching the
1232 * ctask/scsi_cmnd
1233 */
1234 scsi_flush_work(session->host);
1235 goto success_unlocked;
1236 case TMABORT_NOT_FOUND:
1237 if (!ctask->sc) {
1238 /* ctask completed before tmf abort response */
1239 debug_scsi("sc completed while abort in progress\n");
1240 goto success;
1241 }
1242 /* fall through */
1243 default:
1244 /* timedout or failed */
1245 spin_unlock_bh(&session->lock);
1246 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1247 goto failed_unlocked;
1248 }
1249
1250 success:
1251 spin_unlock_bh(&session->lock);
1252 success_unlocked:
1253 debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
1254 return SUCCESS;
1255
1256 failed:
1257 spin_unlock_bh(&session->lock);
1258 failed_unlocked:
1259 debug_scsi("abort failed [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
1260 return FAILED;
1261 }
1262 EXPORT_SYMBOL_GPL(iscsi_eh_abort);
1263
1264 int
1265 iscsi_pool_init(struct iscsi_queue *q, int max, void ***items, int item_size)
1266 {
1267 int i;
1268
1269 *items = kmalloc(max * sizeof(void*), GFP_KERNEL);
1270 if (*items == NULL)
1271 return -ENOMEM;
1272
1273 q->max = max;
1274 q->pool = kmalloc(max * sizeof(void*), GFP_KERNEL);
1275 if (q->pool == NULL) {
1276 kfree(*items);
1277 return -ENOMEM;
1278 }
1279
1280 q->queue = kfifo_init((void*)q->pool, max * sizeof(void*),
1281 GFP_KERNEL, NULL);
1282 if (q->queue == ERR_PTR(-ENOMEM)) {
1283 kfree(q->pool);
1284 kfree(*items);
1285 return -ENOMEM;
1286 }
1287
1288 for (i = 0; i < max; i++) {
1289 q->pool[i] = kmalloc(item_size, GFP_KERNEL);
1290 if (q->pool[i] == NULL) {
1291 int j;
1292
1293 for (j = 0; j < i; j++)
1294 kfree(q->pool[j]);
1295
1296 kfifo_free(q->queue);
1297 kfree(q->pool);
1298 kfree(*items);
1299 return -ENOMEM;
1300 }
1301 memset(q->pool[i], 0, item_size);
1302 (*items)[i] = q->pool[i];
1303 __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*));
1304 }
1305 return 0;
1306 }
1307 EXPORT_SYMBOL_GPL(iscsi_pool_init);
1308
1309 void iscsi_pool_free(struct iscsi_queue *q, void **items)
1310 {
1311 int i;
1312
1313 for (i = 0; i < q->max; i++)
1314 kfree(items[i]);
1315 kfree(q->pool);
1316 kfree(items);
1317 }
1318 EXPORT_SYMBOL_GPL(iscsi_pool_free);
1319
1320 /*
1321 * iSCSI Session's hostdata organization:
1322 *
1323 * *------------------* <== hostdata_session(host->hostdata)
1324 * | ptr to class sess|
1325 * |------------------| <== iscsi_hostdata(host->hostdata)
1326 * | iscsi_session |
1327 * *------------------*
1328 */
1329
1330 #define hostdata_privsize(_sz) (sizeof(unsigned long) + _sz + \
1331 _sz % sizeof(unsigned long))
1332
1333 #define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata))
1334
1335 /**
1336 * iscsi_session_setup - create iscsi cls session and host and session
1337 * @scsit: scsi transport template
1338 * @iscsit: iscsi transport template
1339 * @cmds_max: scsi host can queue
1340 * @qdepth: scsi host cmds per lun
1341 * @cmd_task_size: LLD ctask private data size
1342 * @mgmt_task_size: LLD mtask private data size
1343 * @initial_cmdsn: initial CmdSN
1344 * @hostno: host no allocated
1345 *
1346 * This can be used by software iscsi_transports that allocate
1347 * a session per scsi host.
1348 **/
1349 struct iscsi_cls_session *
1350 iscsi_session_setup(struct iscsi_transport *iscsit,
1351 struct scsi_transport_template *scsit,
1352 uint16_t cmds_max, uint16_t qdepth,
1353 int cmd_task_size, int mgmt_task_size,
1354 uint32_t initial_cmdsn, uint32_t *hostno)
1355 {
1356 struct Scsi_Host *shost;
1357 struct iscsi_session *session;
1358 struct iscsi_cls_session *cls_session;
1359 int cmd_i;
1360
1361 if (qdepth > ISCSI_MAX_CMD_PER_LUN || qdepth < 1) {
1362 if (qdepth != 0)
1363 printk(KERN_ERR "iscsi: invalid queue depth of %d. "
1364 "Queue depth must be between 1 and %d.\n",
1365 qdepth, ISCSI_MAX_CMD_PER_LUN);
1366 qdepth = ISCSI_DEF_CMD_PER_LUN;
1367 }
1368
1369 if (cmds_max < 2 || (cmds_max & (cmds_max - 1)) ||
1370 cmds_max >= ISCSI_MGMT_ITT_OFFSET) {
1371 if (cmds_max != 0)
1372 printk(KERN_ERR "iscsi: invalid can_queue of %d. "
1373 "can_queue must be a power of 2 and between "
1374 "2 and %d - setting to %d.\n", cmds_max,
1375 ISCSI_MGMT_ITT_OFFSET, ISCSI_DEF_XMIT_CMDS_MAX);
1376 cmds_max = ISCSI_DEF_XMIT_CMDS_MAX;
1377 }
1378
1379 shost = scsi_host_alloc(iscsit->host_template,
1380 hostdata_privsize(sizeof(*session)));
1381 if (!shost)
1382 return NULL;
1383
1384 /* the iscsi layer takes one task for reserve */
1385 shost->can_queue = cmds_max - 1;
1386 shost->cmd_per_lun = qdepth;
1387 shost->max_id = 1;
1388 shost->max_channel = 0;
1389 shost->max_lun = iscsit->max_lun;
1390 shost->max_cmd_len = iscsit->max_cmd_len;
1391 shost->transportt = scsit;
1392 shost->transportt->create_work_queue = 1;
1393 *hostno = shost->host_no;
1394
1395 session = iscsi_hostdata(shost->hostdata);
1396 memset(session, 0, sizeof(struct iscsi_session));
1397 session->host = shost;
1398 session->state = ISCSI_STATE_FREE;
1399 session->mgmtpool_max = ISCSI_MGMT_CMDS_MAX;
1400 session->cmds_max = cmds_max;
1401 session->queued_cmdsn = session->cmdsn = initial_cmdsn;
1402 session->exp_cmdsn = initial_cmdsn + 1;
1403 session->max_cmdsn = initial_cmdsn + 1;
1404 session->max_r2t = 1;
1405 session->tt = iscsit;
1406
1407 /* initialize SCSI PDU commands pool */
1408 if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
1409 (void***)&session->cmds,
1410 cmd_task_size + sizeof(struct iscsi_cmd_task)))
1411 goto cmdpool_alloc_fail;
1412
1413 /* pre-format cmds pool with ITT */
1414 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
1415 struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
1416
1417 if (cmd_task_size)
1418 ctask->dd_data = &ctask[1];
1419 ctask->itt = cmd_i;
1420 INIT_LIST_HEAD(&ctask->running);
1421 }
1422
1423 spin_lock_init(&session->lock);
1424
1425 /* initialize immediate command pool */
1426 if (iscsi_pool_init(&session->mgmtpool, session->mgmtpool_max,
1427 (void***)&session->mgmt_cmds,
1428 mgmt_task_size + sizeof(struct iscsi_mgmt_task)))
1429 goto mgmtpool_alloc_fail;
1430
1431
1432 /* pre-format immediate cmds pool with ITT */
1433 for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) {
1434 struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i];
1435
1436 if (mgmt_task_size)
1437 mtask->dd_data = &mtask[1];
1438 mtask->itt = ISCSI_MGMT_ITT_OFFSET + cmd_i;
1439 INIT_LIST_HEAD(&mtask->running);
1440 }
1441
1442 if (scsi_add_host(shost, NULL))
1443 goto add_host_fail;
1444
1445 if (!try_module_get(iscsit->owner))
1446 goto cls_session_fail;
1447
1448 cls_session = iscsi_create_session(shost, iscsit, 0);
1449 if (!cls_session)
1450 goto module_put;
1451 *(unsigned long*)shost->hostdata = (unsigned long)cls_session;
1452
1453 return cls_session;
1454
1455 module_put:
1456 module_put(iscsit->owner);
1457 cls_session_fail:
1458 scsi_remove_host(shost);
1459 add_host_fail:
1460 iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
1461 mgmtpool_alloc_fail:
1462 iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
1463 cmdpool_alloc_fail:
1464 scsi_host_put(shost);
1465 return NULL;
1466 }
1467 EXPORT_SYMBOL_GPL(iscsi_session_setup);
1468
1469 /**
1470 * iscsi_session_teardown - destroy session, host, and cls_session
1471 * shost: scsi host
1472 *
1473 * This can be used by software iscsi_transports that allocate
1474 * a session per scsi host.
1475 **/
1476 void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
1477 {
1478 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
1479 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
1480 struct module *owner = cls_session->transport->owner;
1481
1482 iscsi_unblock_session(cls_session);
1483 scsi_remove_host(shost);
1484
1485 iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
1486 iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
1487
1488 kfree(session->password);
1489 kfree(session->password_in);
1490 kfree(session->username);
1491 kfree(session->username_in);
1492 kfree(session->targetname);
1493 kfree(session->netdev);
1494 kfree(session->hwaddress);
1495 kfree(session->initiatorname);
1496
1497 iscsi_destroy_session(cls_session);
1498 scsi_host_put(shost);
1499 module_put(owner);
1500 }
1501 EXPORT_SYMBOL_GPL(iscsi_session_teardown);
1502
1503 /**
1504 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
1505 * @cls_session: iscsi_cls_session
1506 * @conn_idx: cid
1507 **/
1508 struct iscsi_cls_conn *
1509 iscsi_conn_setup(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
1510 {
1511 struct iscsi_session *session = class_to_transport_session(cls_session);
1512 struct iscsi_conn *conn;
1513 struct iscsi_cls_conn *cls_conn;
1514 char *data;
1515
1516 cls_conn = iscsi_create_conn(cls_session, conn_idx);
1517 if (!cls_conn)
1518 return NULL;
1519 conn = cls_conn->dd_data;
1520 memset(conn, 0, sizeof(*conn));
1521
1522 conn->session = session;
1523 conn->cls_conn = cls_conn;
1524 conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
1525 conn->id = conn_idx;
1526 conn->exp_statsn = 0;
1527 conn->tmabort_state = TMABORT_INITIAL;
1528 INIT_LIST_HEAD(&conn->run_list);
1529 INIT_LIST_HEAD(&conn->mgmt_run_list);
1530 INIT_LIST_HEAD(&conn->xmitqueue);
1531
1532 /* initialize general immediate & non-immediate PDU commands queue */
1533 conn->mgmtqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*),
1534 GFP_KERNEL, NULL);
1535 if (conn->mgmtqueue == ERR_PTR(-ENOMEM))
1536 goto mgmtqueue_alloc_fail;
1537
1538 INIT_WORK(&conn->xmitwork, iscsi_xmitworker);
1539
1540 /* allocate login_mtask used for the login/text sequences */
1541 spin_lock_bh(&session->lock);
1542 if (!__kfifo_get(session->mgmtpool.queue,
1543 (void*)&conn->login_mtask,
1544 sizeof(void*))) {
1545 spin_unlock_bh(&session->lock);
1546 goto login_mtask_alloc_fail;
1547 }
1548 spin_unlock_bh(&session->lock);
1549
1550 data = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN, GFP_KERNEL);
1551 if (!data)
1552 goto login_mtask_data_alloc_fail;
1553 conn->login_mtask->data = conn->data = data;
1554
1555 init_timer(&conn->tmabort_timer);
1556 init_waitqueue_head(&conn->ehwait);
1557
1558 return cls_conn;
1559
1560 login_mtask_data_alloc_fail:
1561 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
1562 sizeof(void*));
1563 login_mtask_alloc_fail:
1564 kfifo_free(conn->mgmtqueue);
1565 mgmtqueue_alloc_fail:
1566 iscsi_destroy_conn(cls_conn);
1567 return NULL;
1568 }
1569 EXPORT_SYMBOL_GPL(iscsi_conn_setup);
1570
1571 /**
1572 * iscsi_conn_teardown - teardown iscsi connection
1573 * cls_conn: iscsi class connection
1574 *
1575 * TODO: we may need to make this into a two step process
1576 * like scsi-mls remove + put host
1577 */
1578 void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
1579 {
1580 struct iscsi_conn *conn = cls_conn->dd_data;
1581 struct iscsi_session *session = conn->session;
1582 unsigned long flags;
1583
1584 spin_lock_bh(&session->lock);
1585 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1586 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
1587 if (session->leadconn == conn) {
1588 /*
1589 * leading connection? then give up on recovery.
1590 */
1591 session->state = ISCSI_STATE_TERMINATE;
1592 wake_up(&conn->ehwait);
1593 }
1594 spin_unlock_bh(&session->lock);
1595
1596 /*
1597 * Block until all in-progress commands for this connection
1598 * time out or fail.
1599 */
1600 for (;;) {
1601 spin_lock_irqsave(session->host->host_lock, flags);
1602 if (!session->host->host_busy) { /* OK for ERL == 0 */
1603 spin_unlock_irqrestore(session->host->host_lock, flags);
1604 break;
1605 }
1606 spin_unlock_irqrestore(session->host->host_lock, flags);
1607 msleep_interruptible(500);
1608 printk(KERN_INFO "iscsi: scsi conn_destroy(): host_busy %d "
1609 "host_failed %d\n", session->host->host_busy,
1610 session->host->host_failed);
1611 /*
1612 * force eh_abort() to unblock
1613 */
1614 wake_up(&conn->ehwait);
1615 }
1616
1617 /* flush queued up work because we free the connection below */
1618 scsi_flush_work(session->host);
1619
1620 spin_lock_bh(&session->lock);
1621 kfree(conn->data);
1622 kfree(conn->persistent_address);
1623 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
1624 sizeof(void*));
1625 if (session->leadconn == conn)
1626 session->leadconn = NULL;
1627 spin_unlock_bh(&session->lock);
1628
1629 kfifo_free(conn->mgmtqueue);
1630
1631 iscsi_destroy_conn(cls_conn);
1632 }
1633 EXPORT_SYMBOL_GPL(iscsi_conn_teardown);
1634
1635 int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
1636 {
1637 struct iscsi_conn *conn = cls_conn->dd_data;
1638 struct iscsi_session *session = conn->session;
1639
1640 if (!session) {
1641 printk(KERN_ERR "iscsi: can't start unbound connection\n");
1642 return -EPERM;
1643 }
1644
1645 if ((session->imm_data_en || !session->initial_r2t_en) &&
1646 session->first_burst > session->max_burst) {
1647 printk("iscsi: invalid burst lengths: "
1648 "first_burst %d max_burst %d\n",
1649 session->first_burst, session->max_burst);
1650 return -EINVAL;
1651 }
1652
1653 spin_lock_bh(&session->lock);
1654 conn->c_stage = ISCSI_CONN_STARTED;
1655 session->state = ISCSI_STATE_LOGGED_IN;
1656 session->queued_cmdsn = session->cmdsn;
1657
1658 switch(conn->stop_stage) {
1659 case STOP_CONN_RECOVER:
1660 /*
1661 * unblock eh_abort() if it is blocked. re-try all
1662 * commands after successful recovery
1663 */
1664 conn->stop_stage = 0;
1665 conn->tmabort_state = TMABORT_INITIAL;
1666 session->age++;
1667 spin_unlock_bh(&session->lock);
1668
1669 iscsi_unblock_session(session_to_cls(session));
1670 wake_up(&conn->ehwait);
1671 return 0;
1672 case STOP_CONN_TERM:
1673 conn->stop_stage = 0;
1674 break;
1675 default:
1676 break;
1677 }
1678 spin_unlock_bh(&session->lock);
1679
1680 return 0;
1681 }
1682 EXPORT_SYMBOL_GPL(iscsi_conn_start);
1683
1684 static void
1685 flush_control_queues(struct iscsi_session *session, struct iscsi_conn *conn)
1686 {
1687 struct iscsi_mgmt_task *mtask, *tmp;
1688
1689 /* handle pending */
1690 while (__kfifo_get(conn->mgmtqueue, (void*)&mtask, sizeof(void*))) {
1691 if (mtask == conn->login_mtask)
1692 continue;
1693 debug_scsi("flushing pending mgmt task itt 0x%x\n", mtask->itt);
1694 __kfifo_put(session->mgmtpool.queue, (void*)&mtask,
1695 sizeof(void*));
1696 }
1697
1698 /* handle running */
1699 list_for_each_entry_safe(mtask, tmp, &conn->mgmt_run_list, running) {
1700 debug_scsi("flushing running mgmt task itt 0x%x\n", mtask->itt);
1701 list_del(&mtask->running);
1702
1703 if (mtask == conn->login_mtask)
1704 continue;
1705 __kfifo_put(session->mgmtpool.queue, (void*)&mtask,
1706 sizeof(void*));
1707 }
1708
1709 conn->mtask = NULL;
1710 }
1711
1712 /* Fail commands. Mutex and session lock held and recv side suspended */
1713 static void fail_all_commands(struct iscsi_conn *conn)
1714 {
1715 struct iscsi_cmd_task *ctask, *tmp;
1716
1717 /* flush pending */
1718 list_for_each_entry_safe(ctask, tmp, &conn->xmitqueue, running) {
1719 debug_scsi("failing pending sc %p itt 0x%x\n", ctask->sc,
1720 ctask->itt);
1721 fail_command(conn, ctask, DID_BUS_BUSY << 16);
1722 }
1723
1724 /* fail all other running */
1725 list_for_each_entry_safe(ctask, tmp, &conn->run_list, running) {
1726 debug_scsi("failing in progress sc %p itt 0x%x\n",
1727 ctask->sc, ctask->itt);
1728 fail_command(conn, ctask, DID_BUS_BUSY << 16);
1729 }
1730
1731 conn->ctask = NULL;
1732 }
1733
1734 static void iscsi_start_session_recovery(struct iscsi_session *session,
1735 struct iscsi_conn *conn, int flag)
1736 {
1737 int old_stop_stage;
1738
1739 spin_lock_bh(&session->lock);
1740 if (conn->stop_stage == STOP_CONN_TERM) {
1741 spin_unlock_bh(&session->lock);
1742 return;
1743 }
1744
1745 /*
1746 * When this is called for the in_login state, we only want to clean
1747 * up the login task and connection. We do not need to block and set
1748 * the recovery state again
1749 */
1750 if (flag == STOP_CONN_TERM)
1751 session->state = ISCSI_STATE_TERMINATE;
1752 else if (conn->stop_stage != STOP_CONN_RECOVER)
1753 session->state = ISCSI_STATE_IN_RECOVERY;
1754
1755 old_stop_stage = conn->stop_stage;
1756 conn->stop_stage = flag;
1757 conn->c_stage = ISCSI_CONN_STOPPED;
1758 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1759 spin_unlock_bh(&session->lock);
1760 scsi_flush_work(session->host);
1761
1762 write_lock_bh(conn->recv_lock);
1763 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
1764 write_unlock_bh(conn->recv_lock);
1765
1766 /*
1767 * for connection level recovery we should not calculate
1768 * header digest. conn->hdr_size used for optimization
1769 * in hdr_extract() and will be re-negotiated at
1770 * set_param() time.
1771 */
1772 if (flag == STOP_CONN_RECOVER) {
1773 conn->hdrdgst_en = 0;
1774 conn->datadgst_en = 0;
1775 if (session->state == ISCSI_STATE_IN_RECOVERY &&
1776 old_stop_stage != STOP_CONN_RECOVER) {
1777 debug_scsi("blocking session\n");
1778 iscsi_block_session(session_to_cls(session));
1779 }
1780 }
1781
1782 /*
1783 * flush queues.
1784 */
1785 spin_lock_bh(&session->lock);
1786 fail_all_commands(conn);
1787 flush_control_queues(session, conn);
1788 spin_unlock_bh(&session->lock);
1789 }
1790
1791 void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
1792 {
1793 struct iscsi_conn *conn = cls_conn->dd_data;
1794 struct iscsi_session *session = conn->session;
1795
1796 switch (flag) {
1797 case STOP_CONN_RECOVER:
1798 case STOP_CONN_TERM:
1799 iscsi_start_session_recovery(session, conn, flag);
1800 break;
1801 default:
1802 printk(KERN_ERR "iscsi: invalid stop flag %d\n", flag);
1803 }
1804 }
1805 EXPORT_SYMBOL_GPL(iscsi_conn_stop);
1806
1807 int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
1808 struct iscsi_cls_conn *cls_conn, int is_leading)
1809 {
1810 struct iscsi_session *session = class_to_transport_session(cls_session);
1811 struct iscsi_conn *conn = cls_conn->dd_data;
1812
1813 spin_lock_bh(&session->lock);
1814 if (is_leading)
1815 session->leadconn = conn;
1816 spin_unlock_bh(&session->lock);
1817
1818 /*
1819 * Unblock xmitworker(), Login Phase will pass through.
1820 */
1821 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
1822 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1823 return 0;
1824 }
1825 EXPORT_SYMBOL_GPL(iscsi_conn_bind);
1826
1827
1828 int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
1829 enum iscsi_param param, char *buf, int buflen)
1830 {
1831 struct iscsi_conn *conn = cls_conn->dd_data;
1832 struct iscsi_session *session = conn->session;
1833 uint32_t value;
1834
1835 switch(param) {
1836 case ISCSI_PARAM_MAX_RECV_DLENGTH:
1837 sscanf(buf, "%d", &conn->max_recv_dlength);
1838 break;
1839 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
1840 sscanf(buf, "%d", &conn->max_xmit_dlength);
1841 break;
1842 case ISCSI_PARAM_HDRDGST_EN:
1843 sscanf(buf, "%d", &conn->hdrdgst_en);
1844 break;
1845 case ISCSI_PARAM_DATADGST_EN:
1846 sscanf(buf, "%d", &conn->datadgst_en);
1847 break;
1848 case ISCSI_PARAM_INITIAL_R2T_EN:
1849 sscanf(buf, "%d", &session->initial_r2t_en);
1850 break;
1851 case ISCSI_PARAM_MAX_R2T:
1852 sscanf(buf, "%d", &session->max_r2t);
1853 break;
1854 case ISCSI_PARAM_IMM_DATA_EN:
1855 sscanf(buf, "%d", &session->imm_data_en);
1856 break;
1857 case ISCSI_PARAM_FIRST_BURST:
1858 sscanf(buf, "%d", &session->first_burst);
1859 break;
1860 case ISCSI_PARAM_MAX_BURST:
1861 sscanf(buf, "%d", &session->max_burst);
1862 break;
1863 case ISCSI_PARAM_PDU_INORDER_EN:
1864 sscanf(buf, "%d", &session->pdu_inorder_en);
1865 break;
1866 case ISCSI_PARAM_DATASEQ_INORDER_EN:
1867 sscanf(buf, "%d", &session->dataseq_inorder_en);
1868 break;
1869 case ISCSI_PARAM_ERL:
1870 sscanf(buf, "%d", &session->erl);
1871 break;
1872 case ISCSI_PARAM_IFMARKER_EN:
1873 sscanf(buf, "%d", &value);
1874 BUG_ON(value);
1875 break;
1876 case ISCSI_PARAM_OFMARKER_EN:
1877 sscanf(buf, "%d", &value);
1878 BUG_ON(value);
1879 break;
1880 case ISCSI_PARAM_EXP_STATSN:
1881 sscanf(buf, "%u", &conn->exp_statsn);
1882 break;
1883 case ISCSI_PARAM_USERNAME:
1884 kfree(session->username);
1885 session->username = kstrdup(buf, GFP_KERNEL);
1886 if (!session->username)
1887 return -ENOMEM;
1888 break;
1889 case ISCSI_PARAM_USERNAME_IN:
1890 kfree(session->username_in);
1891 session->username_in = kstrdup(buf, GFP_KERNEL);
1892 if (!session->username_in)
1893 return -ENOMEM;
1894 break;
1895 case ISCSI_PARAM_PASSWORD:
1896 kfree(session->password);
1897 session->password = kstrdup(buf, GFP_KERNEL);
1898 if (!session->password)
1899 return -ENOMEM;
1900 break;
1901 case ISCSI_PARAM_PASSWORD_IN:
1902 kfree(session->password_in);
1903 session->password_in = kstrdup(buf, GFP_KERNEL);
1904 if (!session->password_in)
1905 return -ENOMEM;
1906 break;
1907 case ISCSI_PARAM_TARGET_NAME:
1908 /* this should not change between logins */
1909 if (session->targetname)
1910 break;
1911
1912 session->targetname = kstrdup(buf, GFP_KERNEL);
1913 if (!session->targetname)
1914 return -ENOMEM;
1915 break;
1916 case ISCSI_PARAM_TPGT:
1917 sscanf(buf, "%d", &session->tpgt);
1918 break;
1919 case ISCSI_PARAM_PERSISTENT_PORT:
1920 sscanf(buf, "%d", &conn->persistent_port);
1921 break;
1922 case ISCSI_PARAM_PERSISTENT_ADDRESS:
1923 /*
1924 * this is the address returned in discovery so it should
1925 * not change between logins.
1926 */
1927 if (conn->persistent_address)
1928 break;
1929
1930 conn->persistent_address = kstrdup(buf, GFP_KERNEL);
1931 if (!conn->persistent_address)
1932 return -ENOMEM;
1933 break;
1934 default:
1935 return -ENOSYS;
1936 }
1937
1938 return 0;
1939 }
1940 EXPORT_SYMBOL_GPL(iscsi_set_param);
1941
1942 int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
1943 enum iscsi_param param, char *buf)
1944 {
1945 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
1946 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
1947 int len;
1948
1949 switch(param) {
1950 case ISCSI_PARAM_INITIAL_R2T_EN:
1951 len = sprintf(buf, "%d\n", session->initial_r2t_en);
1952 break;
1953 case ISCSI_PARAM_MAX_R2T:
1954 len = sprintf(buf, "%hu\n", session->max_r2t);
1955 break;
1956 case ISCSI_PARAM_IMM_DATA_EN:
1957 len = sprintf(buf, "%d\n", session->imm_data_en);
1958 break;
1959 case ISCSI_PARAM_FIRST_BURST:
1960 len = sprintf(buf, "%u\n", session->first_burst);
1961 break;
1962 case ISCSI_PARAM_MAX_BURST:
1963 len = sprintf(buf, "%u\n", session->max_burst);
1964 break;
1965 case ISCSI_PARAM_PDU_INORDER_EN:
1966 len = sprintf(buf, "%d\n", session->pdu_inorder_en);
1967 break;
1968 case ISCSI_PARAM_DATASEQ_INORDER_EN:
1969 len = sprintf(buf, "%d\n", session->dataseq_inorder_en);
1970 break;
1971 case ISCSI_PARAM_ERL:
1972 len = sprintf(buf, "%d\n", session->erl);
1973 break;
1974 case ISCSI_PARAM_TARGET_NAME:
1975 len = sprintf(buf, "%s\n", session->targetname);
1976 break;
1977 case ISCSI_PARAM_TPGT:
1978 len = sprintf(buf, "%d\n", session->tpgt);
1979 break;
1980 case ISCSI_PARAM_USERNAME:
1981 len = sprintf(buf, "%s\n", session->username);
1982 break;
1983 case ISCSI_PARAM_USERNAME_IN:
1984 len = sprintf(buf, "%s\n", session->username_in);
1985 break;
1986 case ISCSI_PARAM_PASSWORD:
1987 len = sprintf(buf, "%s\n", session->password);
1988 break;
1989 case ISCSI_PARAM_PASSWORD_IN:
1990 len = sprintf(buf, "%s\n", session->password_in);
1991 break;
1992 default:
1993 return -ENOSYS;
1994 }
1995
1996 return len;
1997 }
1998 EXPORT_SYMBOL_GPL(iscsi_session_get_param);
1999
2000 int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
2001 enum iscsi_param param, char *buf)
2002 {
2003 struct iscsi_conn *conn = cls_conn->dd_data;
2004 int len;
2005
2006 switch(param) {
2007 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2008 len = sprintf(buf, "%u\n", conn->max_recv_dlength);
2009 break;
2010 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2011 len = sprintf(buf, "%u\n", conn->max_xmit_dlength);
2012 break;
2013 case ISCSI_PARAM_HDRDGST_EN:
2014 len = sprintf(buf, "%d\n", conn->hdrdgst_en);
2015 break;
2016 case ISCSI_PARAM_DATADGST_EN:
2017 len = sprintf(buf, "%d\n", conn->datadgst_en);
2018 break;
2019 case ISCSI_PARAM_IFMARKER_EN:
2020 len = sprintf(buf, "%d\n", conn->ifmarker_en);
2021 break;
2022 case ISCSI_PARAM_OFMARKER_EN:
2023 len = sprintf(buf, "%d\n", conn->ofmarker_en);
2024 break;
2025 case ISCSI_PARAM_EXP_STATSN:
2026 len = sprintf(buf, "%u\n", conn->exp_statsn);
2027 break;
2028 case ISCSI_PARAM_PERSISTENT_PORT:
2029 len = sprintf(buf, "%d\n", conn->persistent_port);
2030 break;
2031 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2032 len = sprintf(buf, "%s\n", conn->persistent_address);
2033 break;
2034 default:
2035 return -ENOSYS;
2036 }
2037
2038 return len;
2039 }
2040 EXPORT_SYMBOL_GPL(iscsi_conn_get_param);
2041
2042 int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2043 char *buf)
2044 {
2045 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
2046 int len;
2047
2048 switch (param) {
2049 case ISCSI_HOST_PARAM_NETDEV_NAME:
2050 if (!session->netdev)
2051 len = sprintf(buf, "%s\n", "default");
2052 else
2053 len = sprintf(buf, "%s\n", session->netdev);
2054 break;
2055 case ISCSI_HOST_PARAM_HWADDRESS:
2056 if (!session->hwaddress)
2057 len = sprintf(buf, "%s\n", "default");
2058 else
2059 len = sprintf(buf, "%s\n", session->hwaddress);
2060 break;
2061 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2062 if (!session->initiatorname)
2063 len = sprintf(buf, "%s\n", "unknown");
2064 else
2065 len = sprintf(buf, "%s\n", session->initiatorname);
2066 break;
2067
2068 default:
2069 return -ENOSYS;
2070 }
2071
2072 return len;
2073 }
2074 EXPORT_SYMBOL_GPL(iscsi_host_get_param);
2075
2076 int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2077 char *buf, int buflen)
2078 {
2079 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
2080
2081 switch (param) {
2082 case ISCSI_HOST_PARAM_NETDEV_NAME:
2083 if (!session->netdev)
2084 session->netdev = kstrdup(buf, GFP_KERNEL);
2085 break;
2086 case ISCSI_HOST_PARAM_HWADDRESS:
2087 if (!session->hwaddress)
2088 session->hwaddress = kstrdup(buf, GFP_KERNEL);
2089 break;
2090 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2091 if (!session->initiatorname)
2092 session->initiatorname = kstrdup(buf, GFP_KERNEL);
2093 break;
2094 default:
2095 return -ENOSYS;
2096 }
2097
2098 return 0;
2099 }
2100 EXPORT_SYMBOL_GPL(iscsi_host_set_param);
2101
2102 MODULE_AUTHOR("Mike Christie");
2103 MODULE_DESCRIPTION("iSCSI library functions");
2104 MODULE_LICENSE("GPL");
linux 2.6 git repository for openrd