?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Merge git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
[wrt350n-kernel.git] / drivers / scsi / libiscsi.c
blob25acaa4b09572d86c87355b374852360b2acb496
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 <linux/log2.h>
28 #include <asm/unaligned.h>
29 #include <net/tcp.h>
30 #include <scsi/scsi_cmnd.h>
31 #include <scsi/scsi_device.h>
32 #include <scsi/scsi_eh.h>
33 #include <scsi/scsi_tcq.h>
34 #include <scsi/scsi_host.h>
35 #include <scsi/scsi.h>
36 #include <scsi/iscsi_proto.h>
37 #include <scsi/scsi_transport.h>
38 #include <scsi/scsi_transport_iscsi.h>
39 #include <scsi/libiscsi.h>
40
41 struct iscsi_session *
42 class_to_transport_session(struct iscsi_cls_session *cls_session)
43 {
44 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
45 return iscsi_hostdata(shost->hostdata);
46 }
47 EXPORT_SYMBOL_GPL(class_to_transport_session);
48
49 /* Serial Number Arithmetic, 32 bits, less than, RFC1982 */
50 #define SNA32_CHECK 2147483648UL
51
52 static int iscsi_sna_lt(u32 n1, u32 n2)
53 {
54 return n1 != n2 && ((n1 < n2 && (n2 - n1 < SNA32_CHECK)) ||
55 (n1 > n2 && (n2 - n1 < SNA32_CHECK)));
56 }
57
58 /* Serial Number Arithmetic, 32 bits, less than, RFC1982 */
59 static int iscsi_sna_lte(u32 n1, u32 n2)
60 {
61 return n1 == n2 || ((n1 < n2 && (n2 - n1 < SNA32_CHECK)) ||
62 (n1 > n2 && (n2 - n1 < SNA32_CHECK)));
63 }
64
65 void
66 iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr)
67 {
68 uint32_t max_cmdsn = be32_to_cpu(hdr->max_cmdsn);
69 uint32_t exp_cmdsn = be32_to_cpu(hdr->exp_cmdsn);
70
71 /*
72 * standard specifies this check for when to update expected and
73 * max sequence numbers
74 */
75 if (iscsi_sna_lt(max_cmdsn, exp_cmdsn - 1))
76 return;
77
78 if (exp_cmdsn != session->exp_cmdsn &&
79 !iscsi_sna_lt(exp_cmdsn, session->exp_cmdsn))
80 session->exp_cmdsn = exp_cmdsn;
81
82 if (max_cmdsn != session->max_cmdsn &&
83 !iscsi_sna_lt(max_cmdsn, session->max_cmdsn)) {
84 session->max_cmdsn = max_cmdsn;
85 /*
86 * if the window closed with IO queued, then kick the
87 * xmit thread
88 */
89 if (!list_empty(&session->leadconn->xmitqueue) ||
90 !list_empty(&session->leadconn->mgmtqueue))
91 scsi_queue_work(session->host,
92 &session->leadconn->xmitwork);
93 }
94 }
95 EXPORT_SYMBOL_GPL(iscsi_update_cmdsn);
96
97 void iscsi_prep_unsolicit_data_pdu(struct iscsi_cmd_task *ctask,
98 struct iscsi_data *hdr)
99 {
100 struct iscsi_conn *conn = ctask->conn;
101
102 memset(hdr, 0, sizeof(struct iscsi_data));
103 hdr->ttt = cpu_to_be32(ISCSI_RESERVED_TAG);
104 hdr->datasn = cpu_to_be32(ctask->unsol_datasn);
105 ctask->unsol_datasn++;
106 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
107 memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
108
109 hdr->itt = ctask->hdr->itt;
110 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
111 hdr->offset = cpu_to_be32(ctask->unsol_offset);
112
113 if (ctask->unsol_count > conn->max_xmit_dlength) {
114 hton24(hdr->dlength, conn->max_xmit_dlength);
115 ctask->data_count = conn->max_xmit_dlength;
116 ctask->unsol_offset += ctask->data_count;
117 hdr->flags = 0;
118 } else {
119 hton24(hdr->dlength, ctask->unsol_count);
120 ctask->data_count = ctask->unsol_count;
121 hdr->flags = ISCSI_FLAG_CMD_FINAL;
122 }
123 }
124 EXPORT_SYMBOL_GPL(iscsi_prep_unsolicit_data_pdu);
125
126 static int iscsi_add_hdr(struct iscsi_cmd_task *ctask, unsigned len)
127 {
128 unsigned exp_len = ctask->hdr_len + len;
129
130 if (exp_len > ctask->hdr_max) {
131 WARN_ON(1);
132 return -EINVAL;
133 }
134
135 WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */
136 ctask->hdr_len = exp_len;
137 return 0;
138 }
139
140 /**
141 * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
142 * @ctask: iscsi cmd task
143 *
144 * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set
145 * fields like dlength or final based on how much data it sends
146 */
147 static int iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask)
148 {
149 struct iscsi_conn *conn = ctask->conn;
150 struct iscsi_session *session = conn->session;
151 struct iscsi_cmd *hdr = ctask->hdr;
152 struct scsi_cmnd *sc = ctask->sc;
153 unsigned hdrlength;
154 int rc;
155
156 ctask->hdr_len = 0;
157 rc = iscsi_add_hdr(ctask, sizeof(*hdr));
158 if (rc)
159 return rc;
160 hdr->opcode = ISCSI_OP_SCSI_CMD;
161 hdr->flags = ISCSI_ATTR_SIMPLE;
162 int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun);
163 hdr->itt = build_itt(ctask->itt, session->age);
164 hdr->data_length = cpu_to_be32(scsi_bufflen(sc));
165 hdr->cmdsn = cpu_to_be32(session->cmdsn);
166 session->cmdsn++;
167 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
168 memcpy(hdr->cdb, sc->cmnd, sc->cmd_len);
169 if (sc->cmd_len < MAX_COMMAND_SIZE)
170 memset(&hdr->cdb[sc->cmd_len], 0,
171 MAX_COMMAND_SIZE - sc->cmd_len);
172
173 ctask->imm_count = 0;
174 if (sc->sc_data_direction == DMA_TO_DEVICE) {
175 hdr->flags |= ISCSI_FLAG_CMD_WRITE;
176 /*
177 * Write counters:
178 *
179 * imm_count bytes to be sent right after
180 * SCSI PDU Header
181 *
182 * unsol_count bytes(as Data-Out) to be sent
183 * without R2T ack right after
184 * immediate data
185 *
186 * r2t_data_count bytes to be sent via R2T ack's
187 *
188 * pad_count bytes to be sent as zero-padding
189 */
190 ctask->unsol_count = 0;
191 ctask->unsol_offset = 0;
192 ctask->unsol_datasn = 0;
193
194 if (session->imm_data_en) {
195 if (scsi_bufflen(sc) >= session->first_burst)
196 ctask->imm_count = min(session->first_burst,
197 conn->max_xmit_dlength);
198 else
199 ctask->imm_count = min(scsi_bufflen(sc),
200 conn->max_xmit_dlength);
201 hton24(hdr->dlength, ctask->imm_count);
202 } else
203 zero_data(hdr->dlength);
204
205 if (!session->initial_r2t_en) {
206 ctask->unsol_count = min((session->first_burst),
207 (scsi_bufflen(sc))) - ctask->imm_count;
208 ctask->unsol_offset = ctask->imm_count;
209 }
210
211 if (!ctask->unsol_count)
212 /* No unsolicit Data-Out's */
213 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
214 } else {
215 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
216 zero_data(hdr->dlength);
217
218 if (sc->sc_data_direction == DMA_FROM_DEVICE)
219 hdr->flags |= ISCSI_FLAG_CMD_READ;
220 }
221
222 /* calculate size of additional header segments (AHSs) */
223 hdrlength = ctask->hdr_len - sizeof(*hdr);
224
225 WARN_ON(hdrlength & (ISCSI_PAD_LEN-1));
226 hdrlength /= ISCSI_PAD_LEN;
227
228 WARN_ON(hdrlength >= 256);
229 hdr->hlength = hdrlength & 0xFF;
230
231 if (conn->session->tt->init_cmd_task(conn->ctask))
232 return EIO;
233
234 conn->scsicmd_pdus_cnt++;
235 debug_scsi("iscsi prep [%s cid %d sc %p cdb 0x%x itt 0x%x len %d "
236 "cmdsn %d win %d]\n",
237 sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read",
238 conn->id, sc, sc->cmnd[0], ctask->itt, scsi_bufflen(sc),
239 session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1);
240 return 0;
241 }
242
243 /**
244 * iscsi_complete_command - return command back to scsi-ml
245 * @ctask: iscsi cmd task
246 *
247 * Must be called with session lock.
248 * This function returns the scsi command to scsi-ml and returns
249 * the cmd task to the pool of available cmd tasks.
250 */
251 static void iscsi_complete_command(struct iscsi_cmd_task *ctask)
252 {
253 struct iscsi_conn *conn = ctask->conn;
254 struct iscsi_session *session = 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 if (conn->ctask == ctask)
262 conn->ctask = NULL;
263 list_del_init(&ctask->running);
264 __kfifo_put(session->cmdpool.queue, (void*)&ctask, sizeof(void*));
265 sc->scsi_done(sc);
266 }
267
268 static void __iscsi_get_ctask(struct iscsi_cmd_task *ctask)
269 {
270 atomic_inc(&ctask->refcount);
271 }
272
273 static void __iscsi_put_ctask(struct iscsi_cmd_task *ctask)
274 {
275 if (atomic_dec_and_test(&ctask->refcount))
276 iscsi_complete_command(ctask);
277 }
278
279 /*
280 * session lock must be held
281 */
282 static void fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
283 int err)
284 {
285 struct scsi_cmnd *sc;
286
287 sc = ctask->sc;
288 if (!sc)
289 return;
290
291 if (ctask->state == ISCSI_TASK_PENDING)
292 /*
293 * cmd never made it to the xmit thread, so we should not count
294 * the cmd in the sequencing
295 */
296 conn->session->queued_cmdsn--;
297 else
298 conn->session->tt->cleanup_cmd_task(conn, ctask);
299
300 sc->result = err;
301 scsi_set_resid(sc, scsi_bufflen(sc));
302 if (conn->ctask == ctask)
303 conn->ctask = NULL;
304 /* release ref from queuecommand */
305 __iscsi_put_ctask(ctask);
306 }
307
308 /**
309 * iscsi_free_mgmt_task - return mgmt task back to pool
310 * @conn: iscsi connection
311 * @mtask: mtask
312 *
313 * Must be called with session lock.
314 */
315 void iscsi_free_mgmt_task(struct iscsi_conn *conn,
316 struct iscsi_mgmt_task *mtask)
317 {
318 list_del_init(&mtask->running);
319 if (conn->login_mtask == mtask)
320 return;
321
322 if (conn->ping_mtask == mtask)
323 conn->ping_mtask = NULL;
324 __kfifo_put(conn->session->mgmtpool.queue,
325 (void*)&mtask, sizeof(void*));
326 }
327 EXPORT_SYMBOL_GPL(iscsi_free_mgmt_task);
328
329 static struct iscsi_mgmt_task *
330 __iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
331 char *data, uint32_t data_size)
332 {
333 struct iscsi_session *session = conn->session;
334 struct iscsi_mgmt_task *mtask;
335
336 if (session->state == ISCSI_STATE_TERMINATE)
337 return NULL;
338
339 if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) ||
340 hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
341 /*
342 * Login and Text are sent serially, in
343 * request-followed-by-response sequence.
344 * Same mtask can be used. Same ITT must be used.
345 * Note that login_mtask is preallocated at conn_create().
346 */
347 mtask = conn->login_mtask;
348 else {
349 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
350 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
351
352 if (!__kfifo_get(session->mgmtpool.queue,
353 (void*)&mtask, sizeof(void*)))
354 return NULL;
355 }
356
357 if (data_size) {
358 memcpy(mtask->data, data, data_size);
359 mtask->data_count = data_size;
360 } else
361 mtask->data_count = 0;
362
363 memcpy(mtask->hdr, hdr, sizeof(struct iscsi_hdr));
364 INIT_LIST_HEAD(&mtask->running);
365 list_add_tail(&mtask->running, &conn->mgmtqueue);
366 return mtask;
367 }
368
369 int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr,
370 char *data, uint32_t data_size)
371 {
372 struct iscsi_conn *conn = cls_conn->dd_data;
373 struct iscsi_session *session = conn->session;
374 int err = 0;
375
376 spin_lock_bh(&session->lock);
377 if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size))
378 err = -EPERM;
379 spin_unlock_bh(&session->lock);
380 scsi_queue_work(session->host, &conn->xmitwork);
381 return err;
382 }
383 EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu);
384
385 /**
386 * iscsi_cmd_rsp - SCSI Command Response processing
387 * @conn: iscsi connection
388 * @hdr: iscsi header
389 * @ctask: scsi command task
390 * @data: cmd data buffer
391 * @datalen: len of buffer
392 *
393 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and
394 * then completes the command and task.
395 **/
396 static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
397 struct iscsi_cmd_task *ctask, char *data,
398 int datalen)
399 {
400 struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)hdr;
401 struct iscsi_session *session = conn->session;
402 struct scsi_cmnd *sc = ctask->sc;
403
404 iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr);
405 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
406
407 sc->result = (DID_OK << 16) | rhdr->cmd_status;
408
409 if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) {
410 sc->result = DID_ERROR << 16;
411 goto out;
412 }
413
414 if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) {
415 uint16_t senselen;
416
417 if (datalen < 2) {
418 invalid_datalen:
419 iscsi_conn_printk(KERN_ERR, conn,
420 "Got CHECK_CONDITION but invalid data "
421 "buffer size of %d\n", datalen);
422 sc->result = DID_BAD_TARGET << 16;
423 goto out;
424 }
425
426 senselen = be16_to_cpu(get_unaligned((__be16 *) data));
427 if (datalen < senselen)
428 goto invalid_datalen;
429
430 memcpy(sc->sense_buffer, data + 2,
431 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
432 debug_scsi("copied %d bytes of sense\n",
433 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
434 }
435
436 if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW |
437 ISCSI_FLAG_CMD_OVERFLOW)) {
438 int res_count = be32_to_cpu(rhdr->residual_count);
439
440 if (res_count > 0 &&
441 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW ||
442 res_count <= scsi_bufflen(sc)))
443 scsi_set_resid(sc, res_count);
444 else
445 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
446 } else if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW |
447 ISCSI_FLAG_CMD_BIDI_OVERFLOW))
448 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
449
450 out:
451 debug_scsi("done [sc %lx res %d itt 0x%x]\n",
452 (long)sc, sc->result, ctask->itt);
453 conn->scsirsp_pdus_cnt++;
454
455 __iscsi_put_ctask(ctask);
456 }
457
458 static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
459 {
460 struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr;
461
462 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
463 conn->tmfrsp_pdus_cnt++;
464
465 if (conn->tmf_state != TMF_QUEUED)
466 return;
467
468 if (tmf->response == ISCSI_TMF_RSP_COMPLETE)
469 conn->tmf_state = TMF_SUCCESS;
470 else if (tmf->response == ISCSI_TMF_RSP_NO_TASK)
471 conn->tmf_state = TMF_NOT_FOUND;
472 else
473 conn->tmf_state = TMF_FAILED;
474 wake_up(&conn->ehwait);
475 }
476
477 static void iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr)
478 {
479 struct iscsi_nopout hdr;
480 struct iscsi_mgmt_task *mtask;
481
482 if (!rhdr && conn->ping_mtask)
483 return;
484
485 memset(&hdr, 0, sizeof(struct iscsi_nopout));
486 hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE;
487 hdr.flags = ISCSI_FLAG_CMD_FINAL;
488
489 if (rhdr) {
490 memcpy(hdr.lun, rhdr->lun, 8);
491 hdr.ttt = rhdr->ttt;
492 hdr.itt = RESERVED_ITT;
493 } else
494 hdr.ttt = RESERVED_ITT;
495
496 mtask = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0);
497 if (!mtask) {
498 iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n");
499 return;
500 }
501
502 /* only track our nops */
503 if (!rhdr) {
504 conn->ping_mtask = mtask;
505 conn->last_ping = jiffies;
506 }
507 scsi_queue_work(conn->session->host, &conn->xmitwork);
508 }
509
510 static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
511 char *data, int datalen)
512 {
513 struct iscsi_reject *reject = (struct iscsi_reject *)hdr;
514 struct iscsi_hdr rejected_pdu;
515 uint32_t itt;
516
517 conn->exp_statsn = be32_to_cpu(reject->statsn) + 1;
518
519 if (reject->reason == ISCSI_REASON_DATA_DIGEST_ERROR) {
520 if (ntoh24(reject->dlength) > datalen)
521 return ISCSI_ERR_PROTO;
522
523 if (ntoh24(reject->dlength) >= sizeof(struct iscsi_hdr)) {
524 memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr));
525 itt = get_itt(rejected_pdu.itt);
526 iscsi_conn_printk(KERN_ERR, conn,
527 "itt 0x%x had pdu (op 0x%x) rejected "
528 "due to DataDigest error.\n", itt,
529 rejected_pdu.opcode);
530 }
531 }
532 return 0;
533 }
534
535 /**
536 * __iscsi_complete_pdu - complete pdu
537 * @conn: iscsi conn
538 * @hdr: iscsi header
539 * @data: data buffer
540 * @datalen: len of data buffer
541 *
542 * Completes pdu processing by freeing any resources allocated at
543 * queuecommand or send generic. session lock must be held and verify
544 * itt must have been called.
545 */
546 static int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
547 char *data, int datalen)
548 {
549 struct iscsi_session *session = conn->session;
550 int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0;
551 struct iscsi_cmd_task *ctask;
552 struct iscsi_mgmt_task *mtask;
553 uint32_t itt;
554
555 conn->last_recv = jiffies;
556 if (hdr->itt != RESERVED_ITT)
557 itt = get_itt(hdr->itt);
558 else
559 itt = ~0U;
560
561 if (itt < session->cmds_max) {
562 ctask = session->cmds[itt];
563
564 debug_scsi("cmdrsp [op 0x%x cid %d itt 0x%x len %d]\n",
565 opcode, conn->id, ctask->itt, datalen);
566
567 switch(opcode) {
568 case ISCSI_OP_SCSI_CMD_RSP:
569 BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
570 iscsi_scsi_cmd_rsp(conn, hdr, ctask, data,
571 datalen);
572 break;
573 case ISCSI_OP_SCSI_DATA_IN:
574 BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
575 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
576 conn->scsirsp_pdus_cnt++;
577 __iscsi_put_ctask(ctask);
578 }
579 break;
580 case ISCSI_OP_R2T:
581 /* LLD handles this for now */
582 break;
583 default:
584 rc = ISCSI_ERR_BAD_OPCODE;
585 break;
586 }
587 } else if (itt >= ISCSI_MGMT_ITT_OFFSET &&
588 itt < ISCSI_MGMT_ITT_OFFSET + session->mgmtpool_max) {
589 mtask = session->mgmt_cmds[itt - ISCSI_MGMT_ITT_OFFSET];
590
591 debug_scsi("immrsp [op 0x%x cid %d itt 0x%x len %d]\n",
592 opcode, conn->id, mtask->itt, datalen);
593
594 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
595 switch(opcode) {
596 case ISCSI_OP_LOGOUT_RSP:
597 if (datalen) {
598 rc = ISCSI_ERR_PROTO;
599 break;
600 }
601 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
602 /* fall through */
603 case ISCSI_OP_LOGIN_RSP:
604 case ISCSI_OP_TEXT_RSP:
605 /*
606 * login related PDU's exp_statsn is handled in
607 * userspace
608 */
609 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
610 rc = ISCSI_ERR_CONN_FAILED;
611 iscsi_free_mgmt_task(conn, mtask);
612 break;
613 case ISCSI_OP_SCSI_TMFUNC_RSP:
614 if (datalen) {
615 rc = ISCSI_ERR_PROTO;
616 break;
617 }
618
619 iscsi_tmf_rsp(conn, hdr);
620 iscsi_free_mgmt_task(conn, mtask);
621 break;
622 case ISCSI_OP_NOOP_IN:
623 if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) ||
624 datalen) {
625 rc = ISCSI_ERR_PROTO;
626 break;
627 }
628 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
629
630 if (conn->ping_mtask != mtask) {
631 /*
632 * If this is not in response to one of our
633 * nops then it must be from userspace.
634 */
635 if (iscsi_recv_pdu(conn->cls_conn, hdr, data,
636 datalen))
637 rc = ISCSI_ERR_CONN_FAILED;
638 }
639 iscsi_free_mgmt_task(conn, mtask);
640 break;
641 default:
642 rc = ISCSI_ERR_BAD_OPCODE;
643 break;
644 }
645 } else if (itt == ~0U) {
646 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
647
648 switch(opcode) {
649 case ISCSI_OP_NOOP_IN:
650 if (datalen) {
651 rc = ISCSI_ERR_PROTO;
652 break;
653 }
654
655 if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG))
656 break;
657
658 iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr);
659 break;
660 case ISCSI_OP_REJECT:
661 rc = iscsi_handle_reject(conn, hdr, data, datalen);
662 break;
663 case ISCSI_OP_ASYNC_EVENT:
664 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
665 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
666 rc = ISCSI_ERR_CONN_FAILED;
667 break;
668 default:
669 rc = ISCSI_ERR_BAD_OPCODE;
670 break;
671 }
672 } else
673 rc = ISCSI_ERR_BAD_ITT;
674
675 return rc;
676 }
677
678 int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
679 char *data, int datalen)
680 {
681 int rc;
682
683 spin_lock(&conn->session->lock);
684 rc = __iscsi_complete_pdu(conn, hdr, data, datalen);
685 spin_unlock(&conn->session->lock);
686 return rc;
687 }
688 EXPORT_SYMBOL_GPL(iscsi_complete_pdu);
689
690 /* verify itt (itt encoding: age+cid+itt) */
691 int iscsi_verify_itt(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
692 uint32_t *ret_itt)
693 {
694 struct iscsi_session *session = conn->session;
695 struct iscsi_cmd_task *ctask;
696 uint32_t itt;
697
698 if (hdr->itt != RESERVED_ITT) {
699 if (((__force u32)hdr->itt & ISCSI_AGE_MASK) !=
700 (session->age << ISCSI_AGE_SHIFT)) {
701 iscsi_conn_printk(KERN_ERR, conn,
702 "received itt %x expected session "
703 "age (%x)\n", (__force u32)hdr->itt,
704 session->age & ISCSI_AGE_MASK);
705 return ISCSI_ERR_BAD_ITT;
706 }
707
708 itt = get_itt(hdr->itt);
709 } else
710 itt = ~0U;
711
712 if (itt < session->cmds_max) {
713 ctask = session->cmds[itt];
714
715 if (!ctask->sc) {
716 iscsi_conn_printk(KERN_INFO, conn, "dropping ctask "
717 "with itt 0x%x\n", ctask->itt);
718 /* force drop */
719 return ISCSI_ERR_NO_SCSI_CMD;
720 }
721
722 if (ctask->sc->SCp.phase != session->age) {
723 iscsi_conn_printk(KERN_ERR, conn,
724 "iscsi: ctask's session age %d, "
725 "expected %d\n", ctask->sc->SCp.phase,
726 session->age);
727 return ISCSI_ERR_SESSION_FAILED;
728 }
729 }
730
731 *ret_itt = itt;
732 return 0;
733 }
734 EXPORT_SYMBOL_GPL(iscsi_verify_itt);
735
736 void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
737 {
738 struct iscsi_session *session = conn->session;
739 unsigned long flags;
740
741 spin_lock_irqsave(&session->lock, flags);
742 if (session->state == ISCSI_STATE_FAILED) {
743 spin_unlock_irqrestore(&session->lock, flags);
744 return;
745 }
746
747 if (conn->stop_stage == 0)
748 session->state = ISCSI_STATE_FAILED;
749 spin_unlock_irqrestore(&session->lock, flags);
750 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
751 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
752 iscsi_conn_error(conn->cls_conn, err);
753 }
754 EXPORT_SYMBOL_GPL(iscsi_conn_failure);
755
756 static void iscsi_prep_mtask(struct iscsi_conn *conn,
757 struct iscsi_mgmt_task *mtask)
758 {
759 struct iscsi_session *session = conn->session;
760 struct iscsi_hdr *hdr = mtask->hdr;
761 struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
762
763 if (hdr->opcode != (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) &&
764 hdr->opcode != (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
765 nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
766 /*
767 * pre-format CmdSN for outgoing PDU.
768 */
769 nop->cmdsn = cpu_to_be32(session->cmdsn);
770 if (hdr->itt != RESERVED_ITT) {
771 hdr->itt = build_itt(mtask->itt, session->age);
772 /*
773 * TODO: We always use immediate, so we never hit this.
774 * If we start to send tmfs or nops as non-immediate then
775 * we should start checking the cmdsn numbers for mgmt tasks.
776 */
777 if (conn->c_stage == ISCSI_CONN_STARTED &&
778 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
779 session->queued_cmdsn++;
780 session->cmdsn++;
781 }
782 }
783
784 if (session->tt->init_mgmt_task)
785 session->tt->init_mgmt_task(conn, mtask);
786
787 debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n",
788 hdr->opcode & ISCSI_OPCODE_MASK, hdr->itt,
789 mtask->data_count);
790 }
791
792 static int iscsi_xmit_mtask(struct iscsi_conn *conn)
793 {
794 struct iscsi_hdr *hdr = conn->mtask->hdr;
795 int rc;
796
797 if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT)
798 conn->session->state = ISCSI_STATE_LOGGING_OUT;
799 spin_unlock_bh(&conn->session->lock);
800
801 rc = conn->session->tt->xmit_mgmt_task(conn, conn->mtask);
802 spin_lock_bh(&conn->session->lock);
803 if (rc)
804 return rc;
805
806 /* done with this in-progress mtask */
807 conn->mtask = NULL;
808 return 0;
809 }
810
811 static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn)
812 {
813 struct iscsi_session *session = conn->session;
814
815 /*
816 * Check for iSCSI window and take care of CmdSN wrap-around
817 */
818 if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) {
819 debug_scsi("iSCSI CmdSN closed. ExpCmdSn %u MaxCmdSN %u "
820 "CmdSN %u/%u\n", session->exp_cmdsn,
821 session->max_cmdsn, session->cmdsn,
822 session->queued_cmdsn);
823 return -ENOSPC;
824 }
825 return 0;
826 }
827
828 static int iscsi_xmit_ctask(struct iscsi_conn *conn)
829 {
830 struct iscsi_cmd_task *ctask = conn->ctask;
831 int rc;
832
833 __iscsi_get_ctask(ctask);
834 spin_unlock_bh(&conn->session->lock);
835 rc = conn->session->tt->xmit_cmd_task(conn, ctask);
836 spin_lock_bh(&conn->session->lock);
837 __iscsi_put_ctask(ctask);
838 if (!rc)
839 /* done with this ctask */
840 conn->ctask = NULL;
841 return rc;
842 }
843
844 /**
845 * iscsi_requeue_ctask - requeue ctask to run from session workqueue
846 * @ctask: ctask to requeue
847 *
848 * LLDs that need to run a ctask from the session workqueue should call
849 * this. The session lock must be held.
850 */
851 void iscsi_requeue_ctask(struct iscsi_cmd_task *ctask)
852 {
853 struct iscsi_conn *conn = ctask->conn;
854
855 list_move_tail(&ctask->running, &conn->requeue);
856 scsi_queue_work(conn->session->host, &conn->xmitwork);
857 }
858 EXPORT_SYMBOL_GPL(iscsi_requeue_ctask);
859
860 /**
861 * iscsi_data_xmit - xmit any command into the scheduled connection
862 * @conn: iscsi connection
863 *
864 * Notes:
865 * The function can return -EAGAIN in which case the caller must
866 * re-schedule it again later or recover. '0' return code means
867 * successful xmit.
868 **/
869 static int iscsi_data_xmit(struct iscsi_conn *conn)
870 {
871 int rc = 0;
872
873 spin_lock_bh(&conn->session->lock);
874 if (unlikely(conn->suspend_tx)) {
875 debug_scsi("conn %d Tx suspended!\n", conn->id);
876 spin_unlock_bh(&conn->session->lock);
877 return -ENODATA;
878 }
879
880 if (conn->ctask) {
881 rc = iscsi_xmit_ctask(conn);
882 if (rc)
883 goto again;
884 }
885
886 if (conn->mtask) {
887 rc = iscsi_xmit_mtask(conn);
888 if (rc)
889 goto again;
890 }
891
892 /*
893 * process mgmt pdus like nops before commands since we should
894 * only have one nop-out as a ping from us and targets should not
895 * overflow us with nop-ins
896 */
897 check_mgmt:
898 while (!list_empty(&conn->mgmtqueue)) {
899 conn->mtask = list_entry(conn->mgmtqueue.next,
900 struct iscsi_mgmt_task, running);
901 if (conn->session->state == ISCSI_STATE_LOGGING_OUT) {
902 iscsi_free_mgmt_task(conn, conn->mtask);
903 conn->mtask = NULL;
904 continue;
905 }
906
907 iscsi_prep_mtask(conn, conn->mtask);
908 list_move_tail(conn->mgmtqueue.next, &conn->mgmt_run_list);
909 rc = iscsi_xmit_mtask(conn);
910 if (rc)
911 goto again;
912 }
913
914 /* process pending command queue */
915 while (!list_empty(&conn->xmitqueue)) {
916 if (conn->tmf_state == TMF_QUEUED)
917 break;
918
919 conn->ctask = list_entry(conn->xmitqueue.next,
920 struct iscsi_cmd_task, running);
921 if (conn->session->state == ISCSI_STATE_LOGGING_OUT) {
922 fail_command(conn, conn->ctask, DID_IMM_RETRY << 16);
923 continue;
924 }
925 if (iscsi_prep_scsi_cmd_pdu(conn->ctask)) {
926 fail_command(conn, conn->ctask, DID_ABORT << 16);
927 continue;
928 }
929
930 conn->ctask->state = ISCSI_TASK_RUNNING;
931 list_move_tail(conn->xmitqueue.next, &conn->run_list);
932 rc = iscsi_xmit_ctask(conn);
933 if (rc)
934 goto again;
935 /*
936 * we could continuously get new ctask requests so
937 * we need to check the mgmt queue for nops that need to
938 * be sent to aviod starvation
939 */
940 if (!list_empty(&conn->mgmtqueue))
941 goto check_mgmt;
942 }
943
944 while (!list_empty(&conn->requeue)) {
945 if (conn->session->fast_abort && conn->tmf_state != TMF_INITIAL)
946 break;
947
948 /*
949 * we always do fastlogout - conn stop code will clean up.
950 */
951 if (conn->session->state == ISCSI_STATE_LOGGING_OUT)
952 break;
953
954 conn->ctask = list_entry(conn->requeue.next,
955 struct iscsi_cmd_task, running);
956 conn->ctask->state = ISCSI_TASK_RUNNING;
957 list_move_tail(conn->requeue.next, &conn->run_list);
958 rc = iscsi_xmit_ctask(conn);
959 if (rc)
960 goto again;
961 if (!list_empty(&conn->mgmtqueue))
962 goto check_mgmt;
963 }
964 spin_unlock_bh(&conn->session->lock);
965 return -ENODATA;
966
967 again:
968 if (unlikely(conn->suspend_tx))
969 rc = -ENODATA;
970 spin_unlock_bh(&conn->session->lock);
971 return rc;
972 }
973
974 static void iscsi_xmitworker(struct work_struct *work)
975 {
976 struct iscsi_conn *conn =
977 container_of(work, struct iscsi_conn, xmitwork);
978 int rc;
979 /*
980 * serialize Xmit worker on a per-connection basis.
981 */
982 do {
983 rc = iscsi_data_xmit(conn);
984 } while (rc >= 0 || rc == -EAGAIN);
985 }
986
987 enum {
988 FAILURE_BAD_HOST = 1,
989 FAILURE_SESSION_FAILED,
990 FAILURE_SESSION_FREED,
991 FAILURE_WINDOW_CLOSED,
992 FAILURE_OOM,
993 FAILURE_SESSION_TERMINATE,
994 FAILURE_SESSION_IN_RECOVERY,
995 FAILURE_SESSION_RECOVERY_TIMEOUT,
996 FAILURE_SESSION_LOGGING_OUT,
997 FAILURE_SESSION_NOT_READY,
998 };
999
1000 int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
1001 {
1002 struct Scsi_Host *host;
1003 int reason = 0;
1004 struct iscsi_session *session;
1005 struct iscsi_conn *conn;
1006 struct iscsi_cmd_task *ctask = NULL;
1007
1008 sc->scsi_done = done;
1009 sc->result = 0;
1010 sc->SCp.ptr = NULL;
1011
1012 host = sc->device->host;
1013 spin_unlock(host->host_lock);
1014
1015 session = iscsi_hostdata(host->hostdata);
1016 spin_lock(&session->lock);
1017
1018 reason = iscsi_session_chkready(session_to_cls(session));
1019 if (reason) {
1020 sc->result = reason;
1021 goto fault;
1022 }
1023
1024 /*
1025 * ISCSI_STATE_FAILED is a temp. state. The recovery
1026 * code will decide what is best to do with command queued
1027 * during this time
1028 */
1029 if (session->state != ISCSI_STATE_LOGGED_IN &&
1030 session->state != ISCSI_STATE_FAILED) {
1031 /*
1032 * to handle the race between when we set the recovery state
1033 * and block the session we requeue here (commands could
1034 * be entering our queuecommand while a block is starting
1035 * up because the block code is not locked)
1036 */
1037 switch (session->state) {
1038 case ISCSI_STATE_IN_RECOVERY:
1039 reason = FAILURE_SESSION_IN_RECOVERY;
1040 sc->result = DID_IMM_RETRY << 16;
1041 break;
1042 case ISCSI_STATE_LOGGING_OUT:
1043 reason = FAILURE_SESSION_LOGGING_OUT;
1044 sc->result = DID_IMM_RETRY << 16;
1045 break;
1046 case ISCSI_STATE_RECOVERY_FAILED:
1047 reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
1048 sc->result = DID_NO_CONNECT << 16;
1049 break;
1050 case ISCSI_STATE_TERMINATE:
1051 reason = FAILURE_SESSION_TERMINATE;
1052 sc->result = DID_NO_CONNECT << 16;
1053 break;
1054 default:
1055 reason = FAILURE_SESSION_FREED;
1056 sc->result = DID_NO_CONNECT << 16;
1057 }
1058 goto fault;
1059 }
1060
1061 conn = session->leadconn;
1062 if (!conn) {
1063 reason = FAILURE_SESSION_FREED;
1064 sc->result = DID_NO_CONNECT << 16;
1065 goto fault;
1066 }
1067
1068 if (iscsi_check_cmdsn_window_closed(conn)) {
1069 reason = FAILURE_WINDOW_CLOSED;
1070 goto reject;
1071 }
1072
1073 if (!__kfifo_get(session->cmdpool.queue, (void*)&ctask,
1074 sizeof(void*))) {
1075 reason = FAILURE_OOM;
1076 goto reject;
1077 }
1078 session->queued_cmdsn++;
1079
1080 sc->SCp.phase = session->age;
1081 sc->SCp.ptr = (char *)ctask;
1082
1083 atomic_set(&ctask->refcount, 1);
1084 ctask->state = ISCSI_TASK_PENDING;
1085 ctask->conn = conn;
1086 ctask->sc = sc;
1087 INIT_LIST_HEAD(&ctask->running);
1088
1089 list_add_tail(&ctask->running, &conn->xmitqueue);
1090 spin_unlock(&session->lock);
1091
1092 scsi_queue_work(host, &conn->xmitwork);
1093 spin_lock(host->host_lock);
1094 return 0;
1095
1096 reject:
1097 spin_unlock(&session->lock);
1098 debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason);
1099 spin_lock(host->host_lock);
1100 return SCSI_MLQUEUE_HOST_BUSY;
1101
1102 fault:
1103 spin_unlock(&session->lock);
1104 debug_scsi("iscsi: cmd 0x%x is not queued (%d)\n", sc->cmnd[0], reason);
1105 scsi_set_resid(sc, scsi_bufflen(sc));
1106 sc->scsi_done(sc);
1107 spin_lock(host->host_lock);
1108 return 0;
1109 }
1110 EXPORT_SYMBOL_GPL(iscsi_queuecommand);
1111
1112 int iscsi_change_queue_depth(struct scsi_device *sdev, int depth)
1113 {
1114 if (depth > ISCSI_MAX_CMD_PER_LUN)
1115 depth = ISCSI_MAX_CMD_PER_LUN;
1116 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
1117 return sdev->queue_depth;
1118 }
1119 EXPORT_SYMBOL_GPL(iscsi_change_queue_depth);
1120
1121 void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
1122 {
1123 struct iscsi_session *session = class_to_transport_session(cls_session);
1124
1125 spin_lock_bh(&session->lock);
1126 if (session->state != ISCSI_STATE_LOGGED_IN) {
1127 session->state = ISCSI_STATE_RECOVERY_FAILED;
1128 if (session->leadconn)
1129 wake_up(&session->leadconn->ehwait);
1130 }
1131 spin_unlock_bh(&session->lock);
1132 }
1133 EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
1134
1135 int iscsi_eh_host_reset(struct scsi_cmnd *sc)
1136 {
1137 struct Scsi_Host *host = sc->device->host;
1138 struct iscsi_session *session = iscsi_hostdata(host->hostdata);
1139 struct iscsi_conn *conn = session->leadconn;
1140
1141 mutex_lock(&session->eh_mutex);
1142 spin_lock_bh(&session->lock);
1143 if (session->state == ISCSI_STATE_TERMINATE) {
1144 failed:
1145 debug_scsi("failing host reset: session terminated "
1146 "[CID %d age %d]\n", conn->id, session->age);
1147 spin_unlock_bh(&session->lock);
1148 mutex_unlock(&session->eh_mutex);
1149 return FAILED;
1150 }
1151
1152 spin_unlock_bh(&session->lock);
1153 mutex_unlock(&session->eh_mutex);
1154 /*
1155 * we drop the lock here but the leadconn cannot be destoyed while
1156 * we are in the scsi eh
1157 */
1158 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1159
1160 debug_scsi("iscsi_eh_host_reset wait for relogin\n");
1161 wait_event_interruptible(conn->ehwait,
1162 session->state == ISCSI_STATE_TERMINATE ||
1163 session->state == ISCSI_STATE_LOGGED_IN ||
1164 session->state == ISCSI_STATE_RECOVERY_FAILED);
1165 if (signal_pending(current))
1166 flush_signals(current);
1167
1168 mutex_lock(&session->eh_mutex);
1169 spin_lock_bh(&session->lock);
1170 if (session->state == ISCSI_STATE_LOGGED_IN)
1171 iscsi_session_printk(KERN_INFO, session,
1172 "host reset succeeded\n");
1173 else
1174 goto failed;
1175 spin_unlock_bh(&session->lock);
1176 mutex_unlock(&session->eh_mutex);
1177 return SUCCESS;
1178 }
1179 EXPORT_SYMBOL_GPL(iscsi_eh_host_reset);
1180
1181 static void iscsi_tmf_timedout(unsigned long data)
1182 {
1183 struct iscsi_conn *conn = (struct iscsi_conn *)data;
1184 struct iscsi_session *session = conn->session;
1185
1186 spin_lock(&session->lock);
1187 if (conn->tmf_state == TMF_QUEUED) {
1188 conn->tmf_state = TMF_TIMEDOUT;
1189 debug_scsi("tmf timedout\n");
1190 /* unblock eh_abort() */
1191 wake_up(&conn->ehwait);
1192 }
1193 spin_unlock(&session->lock);
1194 }
1195
1196 static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn,
1197 struct iscsi_tm *hdr, int age,
1198 int timeout)
1199 {
1200 struct iscsi_session *session = conn->session;
1201 struct iscsi_mgmt_task *mtask;
1202
1203 mtask = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr,
1204 NULL, 0);
1205 if (!mtask) {
1206 spin_unlock_bh(&session->lock);
1207 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1208 spin_lock_bh(&session->lock);
1209 debug_scsi("tmf exec failure\n");
1210 return -EPERM;
1211 }
1212 conn->tmfcmd_pdus_cnt++;
1213 conn->tmf_timer.expires = timeout * HZ + jiffies;
1214 conn->tmf_timer.function = iscsi_tmf_timedout;
1215 conn->tmf_timer.data = (unsigned long)conn;
1216 add_timer(&conn->tmf_timer);
1217 debug_scsi("tmf set timeout\n");
1218
1219 spin_unlock_bh(&session->lock);
1220 mutex_unlock(&session->eh_mutex);
1221 scsi_queue_work(session->host, &conn->xmitwork);
1222
1223 /*
1224 * block eh thread until:
1225 *
1226 * 1) tmf response
1227 * 2) tmf timeout
1228 * 3) session is terminated or restarted or userspace has
1229 * given up on recovery
1230 */
1231 wait_event_interruptible(conn->ehwait, age != session->age ||
1232 session->state != ISCSI_STATE_LOGGED_IN ||
1233 conn->tmf_state != TMF_QUEUED);
1234 if (signal_pending(current))
1235 flush_signals(current);
1236 del_timer_sync(&conn->tmf_timer);
1237
1238 mutex_lock(&session->eh_mutex);
1239 spin_lock_bh(&session->lock);
1240 /* if the session drops it will clean up the mtask */
1241 if (age != session->age ||
1242 session->state != ISCSI_STATE_LOGGED_IN)
1243 return -ENOTCONN;
1244 return 0;
1245 }
1246
1247 /*
1248 * Fail commands. session lock held and recv side suspended and xmit
1249 * thread flushed
1250 */
1251 static void fail_all_commands(struct iscsi_conn *conn, unsigned lun,
1252 int error)
1253 {
1254 struct iscsi_cmd_task *ctask, *tmp;
1255
1256 if (conn->ctask && (conn->ctask->sc->device->lun == lun || lun == -1))
1257 conn->ctask = NULL;
1258
1259 /* flush pending */
1260 list_for_each_entry_safe(ctask, tmp, &conn->xmitqueue, running) {
1261 if (lun == ctask->sc->device->lun || lun == -1) {
1262 debug_scsi("failing pending sc %p itt 0x%x\n",
1263 ctask->sc, ctask->itt);
1264 fail_command(conn, ctask, error << 16);
1265 }
1266 }
1267
1268 list_for_each_entry_safe(ctask, tmp, &conn->requeue, running) {
1269 if (lun == ctask->sc->device->lun || lun == -1) {
1270 debug_scsi("failing requeued sc %p itt 0x%x\n",
1271 ctask->sc, ctask->itt);
1272 fail_command(conn, ctask, error << 16);
1273 }
1274 }
1275
1276 /* fail all other running */
1277 list_for_each_entry_safe(ctask, tmp, &conn->run_list, running) {
1278 if (lun == ctask->sc->device->lun || lun == -1) {
1279 debug_scsi("failing in progress sc %p itt 0x%x\n",
1280 ctask->sc, ctask->itt);
1281 fail_command(conn, ctask, DID_BUS_BUSY << 16);
1282 }
1283 }
1284 }
1285
1286 static void iscsi_suspend_tx(struct iscsi_conn *conn)
1287 {
1288 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1289 scsi_flush_work(conn->session->host);
1290 }
1291
1292 static void iscsi_start_tx(struct iscsi_conn *conn)
1293 {
1294 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1295 scsi_queue_work(conn->session->host, &conn->xmitwork);
1296 }
1297
1298 static enum scsi_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *scmd)
1299 {
1300 struct iscsi_cls_session *cls_session;
1301 struct iscsi_session *session;
1302 struct iscsi_conn *conn;
1303 enum scsi_eh_timer_return rc = EH_NOT_HANDLED;
1304
1305 cls_session = starget_to_session(scsi_target(scmd->device));
1306 session = class_to_transport_session(cls_session);
1307
1308 debug_scsi("scsi cmd %p timedout\n", scmd);
1309
1310 spin_lock(&session->lock);
1311 if (session->state != ISCSI_STATE_LOGGED_IN) {
1312 /*
1313 * We are probably in the middle of iscsi recovery so let
1314 * that complete and handle the error.
1315 */
1316 rc = EH_RESET_TIMER;
1317 goto done;
1318 }
1319
1320 conn = session->leadconn;
1321 if (!conn) {
1322 /* In the middle of shuting down */
1323 rc = EH_RESET_TIMER;
1324 goto done;
1325 }
1326
1327 if (!conn->recv_timeout && !conn->ping_timeout)
1328 goto done;
1329 /*
1330 * if the ping timedout then we are in the middle of cleaning up
1331 * and can let the iscsi eh handle it
1332 */
1333 if (time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) +
1334 (conn->ping_timeout * HZ), jiffies))
1335 rc = EH_RESET_TIMER;
1336 /*
1337 * if we are about to check the transport then give the command
1338 * more time
1339 */
1340 if (time_before_eq(conn->last_recv + (conn->recv_timeout * HZ),
1341 jiffies))
1342 rc = EH_RESET_TIMER;
1343 /* if in the middle of checking the transport then give us more time */
1344 if (conn->ping_mtask)
1345 rc = EH_RESET_TIMER;
1346 done:
1347 spin_unlock(&session->lock);
1348 debug_scsi("return %s\n", rc == EH_RESET_TIMER ? "timer reset" : "nh");
1349 return rc;
1350 }
1351
1352 static void iscsi_check_transport_timeouts(unsigned long data)
1353 {
1354 struct iscsi_conn *conn = (struct iscsi_conn *)data;
1355 struct iscsi_session *session = conn->session;
1356 unsigned long timeout, next_timeout = 0, last_recv;
1357
1358 spin_lock(&session->lock);
1359 if (session->state != ISCSI_STATE_LOGGED_IN)
1360 goto done;
1361
1362 timeout = conn->recv_timeout;
1363 if (!timeout)
1364 goto done;
1365
1366 timeout *= HZ;
1367 last_recv = conn->last_recv;
1368 if (time_before_eq(last_recv + timeout + (conn->ping_timeout * HZ),
1369 jiffies)) {
1370 iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs "
1371 "expired, last rx %lu, last ping %lu, "
1372 "now %lu\n", conn->ping_timeout, last_recv,
1373 conn->last_ping, jiffies);
1374 spin_unlock(&session->lock);
1375 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1376 return;
1377 }
1378
1379 if (time_before_eq(last_recv + timeout, jiffies)) {
1380 if (time_before_eq(conn->last_ping, last_recv)) {
1381 /* send a ping to try to provoke some traffic */
1382 debug_scsi("Sending nopout as ping on conn %p\n", conn);
1383 iscsi_send_nopout(conn, NULL);
1384 }
1385 next_timeout = last_recv + timeout + (conn->ping_timeout * HZ);
1386 } else
1387 next_timeout = last_recv + timeout;
1388
1389 debug_scsi("Setting next tmo %lu\n", next_timeout);
1390 mod_timer(&conn->transport_timer, next_timeout);
1391 done:
1392 spin_unlock(&session->lock);
1393 }
1394
1395 static void iscsi_prep_abort_task_pdu(struct iscsi_cmd_task *ctask,
1396 struct iscsi_tm *hdr)
1397 {
1398 memset(hdr, 0, sizeof(*hdr));
1399 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
1400 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK;
1401 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
1402 memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
1403 hdr->rtt = ctask->hdr->itt;
1404 hdr->refcmdsn = ctask->hdr->cmdsn;
1405 }
1406
1407 int iscsi_eh_abort(struct scsi_cmnd *sc)
1408 {
1409 struct Scsi_Host *host = sc->device->host;
1410 struct iscsi_session *session = iscsi_hostdata(host->hostdata);
1411 struct iscsi_conn *conn;
1412 struct iscsi_cmd_task *ctask;
1413 struct iscsi_tm *hdr;
1414 int rc, age;
1415
1416 mutex_lock(&session->eh_mutex);
1417 spin_lock_bh(&session->lock);
1418 /*
1419 * if session was ISCSI_STATE_IN_RECOVERY then we may not have
1420 * got the command.
1421 */
1422 if (!sc->SCp.ptr) {
1423 debug_scsi("sc never reached iscsi layer or it completed.\n");
1424 spin_unlock_bh(&session->lock);
1425 mutex_unlock(&session->eh_mutex);
1426 return SUCCESS;
1427 }
1428
1429 /*
1430 * If we are not logged in or we have started a new session
1431 * then let the host reset code handle this
1432 */
1433 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN ||
1434 sc->SCp.phase != session->age) {
1435 spin_unlock_bh(&session->lock);
1436 mutex_unlock(&session->eh_mutex);
1437 return FAILED;
1438 }
1439
1440 conn = session->leadconn;
1441 conn->eh_abort_cnt++;
1442 age = session->age;
1443
1444 ctask = (struct iscsi_cmd_task *)sc->SCp.ptr;
1445 debug_scsi("aborting [sc %p itt 0x%x]\n", sc, ctask->itt);
1446
1447 /* ctask completed before time out */
1448 if (!ctask->sc) {
1449 debug_scsi("sc completed while abort in progress\n");
1450 goto success;
1451 }
1452
1453 if (ctask->state == ISCSI_TASK_PENDING) {
1454 fail_command(conn, ctask, DID_ABORT << 16);
1455 goto success;
1456 }
1457
1458 /* only have one tmf outstanding at a time */
1459 if (conn->tmf_state != TMF_INITIAL)
1460 goto failed;
1461 conn->tmf_state = TMF_QUEUED;
1462
1463 hdr = &conn->tmhdr;
1464 iscsi_prep_abort_task_pdu(ctask, hdr);
1465
1466 if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout)) {
1467 rc = FAILED;
1468 goto failed;
1469 }
1470
1471 switch (conn->tmf_state) {
1472 case TMF_SUCCESS:
1473 spin_unlock_bh(&session->lock);
1474 iscsi_suspend_tx(conn);
1475 /*
1476 * clean up task if aborted. grab the recv lock as a writer
1477 */
1478 write_lock_bh(conn->recv_lock);
1479 spin_lock(&session->lock);
1480 fail_command(conn, ctask, DID_ABORT << 16);
1481 conn->tmf_state = TMF_INITIAL;
1482 spin_unlock(&session->lock);
1483 write_unlock_bh(conn->recv_lock);
1484 iscsi_start_tx(conn);
1485 goto success_unlocked;
1486 case TMF_TIMEDOUT:
1487 spin_unlock_bh(&session->lock);
1488 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1489 goto failed_unlocked;
1490 case TMF_NOT_FOUND:
1491 if (!sc->SCp.ptr) {
1492 conn->tmf_state = TMF_INITIAL;
1493 /* ctask completed before tmf abort response */
1494 debug_scsi("sc completed while abort in progress\n");
1495 goto success;
1496 }
1497 /* fall through */
1498 default:
1499 conn->tmf_state = TMF_INITIAL;
1500 goto failed;
1501 }
1502
1503 success:
1504 spin_unlock_bh(&session->lock);
1505 success_unlocked:
1506 debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
1507 mutex_unlock(&session->eh_mutex);
1508 return SUCCESS;
1509
1510 failed:
1511 spin_unlock_bh(&session->lock);
1512 failed_unlocked:
1513 debug_scsi("abort failed [sc %p itt 0x%x]\n", sc,
1514 ctask ? ctask->itt : 0);
1515 mutex_unlock(&session->eh_mutex);
1516 return FAILED;
1517 }
1518 EXPORT_SYMBOL_GPL(iscsi_eh_abort);
1519
1520 static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
1521 {
1522 memset(hdr, 0, sizeof(*hdr));
1523 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
1524 hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK;
1525 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
1526 int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun);
1527 hdr->rtt = RESERVED_ITT;
1528 }
1529
1530 int iscsi_eh_device_reset(struct scsi_cmnd *sc)
1531 {
1532 struct Scsi_Host *host = sc->device->host;
1533 struct iscsi_session *session = iscsi_hostdata(host->hostdata);
1534 struct iscsi_conn *conn;
1535 struct iscsi_tm *hdr;
1536 int rc = FAILED;
1537
1538 debug_scsi("LU Reset [sc %p lun %u]\n", sc, sc->device->lun);
1539
1540 mutex_lock(&session->eh_mutex);
1541 spin_lock_bh(&session->lock);
1542 /*
1543 * Just check if we are not logged in. We cannot check for
1544 * the phase because the reset could come from a ioctl.
1545 */
1546 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN)
1547 goto unlock;
1548 conn = session->leadconn;
1549
1550 /* only have one tmf outstanding at a time */
1551 if (conn->tmf_state != TMF_INITIAL)
1552 goto unlock;
1553 conn->tmf_state = TMF_QUEUED;
1554
1555 hdr = &conn->tmhdr;
1556 iscsi_prep_lun_reset_pdu(sc, hdr);
1557
1558 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age,
1559 session->lu_reset_timeout)) {
1560 rc = FAILED;
1561 goto unlock;
1562 }
1563
1564 switch (conn->tmf_state) {
1565 case TMF_SUCCESS:
1566 break;
1567 case TMF_TIMEDOUT:
1568 spin_unlock_bh(&session->lock);
1569 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1570 goto done;
1571 default:
1572 conn->tmf_state = TMF_INITIAL;
1573 goto unlock;
1574 }
1575
1576 rc = SUCCESS;
1577 spin_unlock_bh(&session->lock);
1578
1579 iscsi_suspend_tx(conn);
1580 /* need to grab the recv lock then session lock */
1581 write_lock_bh(conn->recv_lock);
1582 spin_lock(&session->lock);
1583 fail_all_commands(conn, sc->device->lun, DID_ERROR);
1584 conn->tmf_state = TMF_INITIAL;
1585 spin_unlock(&session->lock);
1586 write_unlock_bh(conn->recv_lock);
1587
1588 iscsi_start_tx(conn);
1589 goto done;
1590
1591 unlock:
1592 spin_unlock_bh(&session->lock);
1593 done:
1594 debug_scsi("iscsi_eh_device_reset %s\n",
1595 rc == SUCCESS ? "SUCCESS" : "FAILED");
1596 mutex_unlock(&session->eh_mutex);
1597 return rc;
1598 }
1599 EXPORT_SYMBOL_GPL(iscsi_eh_device_reset);
1600
1601 /*
1602 * Pre-allocate a pool of @max items of @item_size. By default, the pool
1603 * should be accessed via kfifo_{get,put} on q->queue.
1604 * Optionally, the caller can obtain the array of object pointers
1605 * by passing in a non-NULL @items pointer
1606 */
1607 int
1608 iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size)
1609 {
1610 int i, num_arrays = 1;
1611
1612 memset(q, 0, sizeof(*q));
1613
1614 q->max = max;
1615
1616 /* If the user passed an items pointer, he wants a copy of
1617 * the array. */
1618 if (items)
1619 num_arrays++;
1620 q->pool = kzalloc(num_arrays * max * sizeof(void*), GFP_KERNEL);
1621 if (q->pool == NULL)
1622 goto enomem;
1623
1624 q->queue = kfifo_init((void*)q->pool, max * sizeof(void*),
1625 GFP_KERNEL, NULL);
1626 if (q->queue == ERR_PTR(-ENOMEM))
1627 goto enomem;
1628
1629 for (i = 0; i < max; i++) {
1630 q->pool[i] = kzalloc(item_size, GFP_KERNEL);
1631 if (q->pool[i] == NULL) {
1632 q->max = i;
1633 goto enomem;
1634 }
1635 __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*));
1636 }
1637
1638 if (items) {
1639 *items = q->pool + max;
1640 memcpy(*items, q->pool, max * sizeof(void *));
1641 }
1642
1643 return 0;
1644
1645 enomem:
1646 iscsi_pool_free(q);
1647 return -ENOMEM;
1648 }
1649 EXPORT_SYMBOL_GPL(iscsi_pool_init);
1650
1651 void iscsi_pool_free(struct iscsi_pool *q)
1652 {
1653 int i;
1654
1655 for (i = 0; i < q->max; i++)
1656 kfree(q->pool[i]);
1657 if (q->pool)
1658 kfree(q->pool);
1659 }
1660 EXPORT_SYMBOL_GPL(iscsi_pool_free);
1661
1662 /*
1663 * iSCSI Session's hostdata organization:
1664 *
1665 * *------------------* <== hostdata_session(host->hostdata)
1666 * | ptr to class sess|
1667 * |------------------| <== iscsi_hostdata(host->hostdata)
1668 * | iscsi_session |
1669 * *------------------*
1670 */
1671
1672 #define hostdata_privsize(_sz) (sizeof(unsigned long) + _sz + \
1673 _sz % sizeof(unsigned long))
1674
1675 #define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata))
1676
1677 /**
1678 * iscsi_session_setup - create iscsi cls session and host and session
1679 * @scsit: scsi transport template
1680 * @iscsit: iscsi transport template
1681 * @cmds_max: scsi host can queue
1682 * @qdepth: scsi host cmds per lun
1683 * @cmd_task_size: LLD ctask private data size
1684 * @mgmt_task_size: LLD mtask private data size
1685 * @initial_cmdsn: initial CmdSN
1686 * @hostno: host no allocated
1687 *
1688 * This can be used by software iscsi_transports that allocate
1689 * a session per scsi host.
1690 **/
1691 struct iscsi_cls_session *
1692 iscsi_session_setup(struct iscsi_transport *iscsit,
1693 struct scsi_transport_template *scsit,
1694 uint16_t cmds_max, uint16_t qdepth,
1695 int cmd_task_size, int mgmt_task_size,
1696 uint32_t initial_cmdsn, uint32_t *hostno)
1697 {
1698 struct Scsi_Host *shost;
1699 struct iscsi_session *session;
1700 struct iscsi_cls_session *cls_session;
1701 int cmd_i;
1702
1703 if (qdepth > ISCSI_MAX_CMD_PER_LUN || qdepth < 1) {
1704 if (qdepth != 0)
1705 printk(KERN_ERR "iscsi: invalid queue depth of %d. "
1706 "Queue depth must be between 1 and %d.\n",
1707 qdepth, ISCSI_MAX_CMD_PER_LUN);
1708 qdepth = ISCSI_DEF_CMD_PER_LUN;
1709 }
1710
1711 <<<<<<< HEAD:drivers/scsi/libiscsi.c
1712 if (!is_power_of_2(cmds_max) ||
1713 cmds_max >= ISCSI_MGMT_ITT_OFFSET) {
1714 =======
1715 if (!is_power_of_2(cmds_max) || cmds_max >= ISCSI_MGMT_ITT_OFFSET ||
1716 cmds_max < 2) {
1717 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/scsi/libiscsi.c
1718 if (cmds_max != 0)
1719 printk(KERN_ERR "iscsi: invalid can_queue of %d. "
1720 "can_queue must be a power of 2 and between "
1721 "2 and %d - setting to %d.\n", cmds_max,
1722 ISCSI_MGMT_ITT_OFFSET, ISCSI_DEF_XMIT_CMDS_MAX);
1723 cmds_max = ISCSI_DEF_XMIT_CMDS_MAX;
1724 }
1725
1726 shost = scsi_host_alloc(iscsit->host_template,
1727 hostdata_privsize(sizeof(*session)));
1728 if (!shost)
1729 return NULL;
1730
1731 /* the iscsi layer takes one task for reserve */
1732 shost->can_queue = cmds_max - 1;
1733 shost->cmd_per_lun = qdepth;
1734 shost->max_id = 1;
1735 shost->max_channel = 0;
1736 shost->max_lun = iscsit->max_lun;
1737 shost->max_cmd_len = iscsit->max_cmd_len;
1738 shost->transportt = scsit;
1739 shost->transportt->create_work_queue = 1;
1740 shost->transportt->eh_timed_out = iscsi_eh_cmd_timed_out;
1741 *hostno = shost->host_no;
1742
1743 session = iscsi_hostdata(shost->hostdata);
1744 memset(session, 0, sizeof(struct iscsi_session));
1745 session->host = shost;
1746 session->state = ISCSI_STATE_FREE;
1747 session->fast_abort = 1;
1748 session->lu_reset_timeout = 15;
1749 session->abort_timeout = 10;
1750 session->mgmtpool_max = ISCSI_MGMT_CMDS_MAX;
1751 session->cmds_max = cmds_max;
1752 session->queued_cmdsn = session->cmdsn = initial_cmdsn;
1753 session->exp_cmdsn = initial_cmdsn + 1;
1754 session->max_cmdsn = initial_cmdsn + 1;
1755 session->max_r2t = 1;
1756 session->tt = iscsit;
1757 mutex_init(&session->eh_mutex);
1758
1759 /* initialize SCSI PDU commands pool */
1760 if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
1761 (void***)&session->cmds,
1762 cmd_task_size + sizeof(struct iscsi_cmd_task)))
1763 goto cmdpool_alloc_fail;
1764
1765 /* pre-format cmds pool with ITT */
1766 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
1767 struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
1768
1769 if (cmd_task_size)
1770 ctask->dd_data = &ctask[1];
1771 ctask->itt = cmd_i;
1772 INIT_LIST_HEAD(&ctask->running);
1773 }
1774
1775 spin_lock_init(&session->lock);
1776
1777 /* initialize immediate command pool */
1778 if (iscsi_pool_init(&session->mgmtpool, session->mgmtpool_max,
1779 (void***)&session->mgmt_cmds,
1780 mgmt_task_size + sizeof(struct iscsi_mgmt_task)))
1781 goto mgmtpool_alloc_fail;
1782
1783
1784 /* pre-format immediate cmds pool with ITT */
1785 for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) {
1786 struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i];
1787
1788 if (mgmt_task_size)
1789 mtask->dd_data = &mtask[1];
1790 mtask->itt = ISCSI_MGMT_ITT_OFFSET + cmd_i;
1791 INIT_LIST_HEAD(&mtask->running);
1792 }
1793
1794 if (scsi_add_host(shost, NULL))
1795 goto add_host_fail;
1796
1797 if (!try_module_get(iscsit->owner))
1798 goto cls_session_fail;
1799
1800 cls_session = iscsi_create_session(shost, iscsit, 0);
1801 if (!cls_session)
1802 goto module_put;
1803 *(unsigned long*)shost->hostdata = (unsigned long)cls_session;
1804
1805 return cls_session;
1806
1807 module_put:
1808 module_put(iscsit->owner);
1809 cls_session_fail:
1810 scsi_remove_host(shost);
1811 add_host_fail:
1812 iscsi_pool_free(&session->mgmtpool);
1813 mgmtpool_alloc_fail:
1814 iscsi_pool_free(&session->cmdpool);
1815 cmdpool_alloc_fail:
1816 scsi_host_put(shost);
1817 return NULL;
1818 }
1819 EXPORT_SYMBOL_GPL(iscsi_session_setup);
1820
1821 /**
1822 * iscsi_session_teardown - destroy session, host, and cls_session
1823 * shost: scsi host
1824 *
1825 * This can be used by software iscsi_transports that allocate
1826 * a session per scsi host.
1827 **/
1828 void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
1829 {
1830 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
1831 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
1832 struct module *owner = cls_session->transport->owner;
1833
1834 iscsi_remove_session(cls_session);
1835 scsi_remove_host(shost);
1836
1837 iscsi_pool_free(&session->mgmtpool);
1838 iscsi_pool_free(&session->cmdpool);
1839
1840 kfree(session->password);
1841 kfree(session->password_in);
1842 kfree(session->username);
1843 kfree(session->username_in);
1844 kfree(session->targetname);
1845 kfree(session->netdev);
1846 kfree(session->hwaddress);
1847 kfree(session->initiatorname);
1848
1849 iscsi_free_session(cls_session);
1850 scsi_host_put(shost);
1851 module_put(owner);
1852 }
1853 EXPORT_SYMBOL_GPL(iscsi_session_teardown);
1854
1855 /**
1856 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
1857 * @cls_session: iscsi_cls_session
1858 * @conn_idx: cid
1859 **/
1860 struct iscsi_cls_conn *
1861 iscsi_conn_setup(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
1862 {
1863 struct iscsi_session *session = class_to_transport_session(cls_session);
1864 struct iscsi_conn *conn;
1865 struct iscsi_cls_conn *cls_conn;
1866 char *data;
1867
1868 cls_conn = iscsi_create_conn(cls_session, conn_idx);
1869 if (!cls_conn)
1870 return NULL;
1871 conn = cls_conn->dd_data;
1872 memset(conn, 0, sizeof(*conn));
1873
1874 conn->session = session;
1875 conn->cls_conn = cls_conn;
1876 conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
1877 conn->id = conn_idx;
1878 conn->exp_statsn = 0;
1879 conn->tmf_state = TMF_INITIAL;
1880
1881 init_timer(&conn->transport_timer);
1882 conn->transport_timer.data = (unsigned long)conn;
1883 conn->transport_timer.function = iscsi_check_transport_timeouts;
1884
1885 INIT_LIST_HEAD(&conn->run_list);
1886 INIT_LIST_HEAD(&conn->mgmt_run_list);
1887 INIT_LIST_HEAD(&conn->mgmtqueue);
1888 INIT_LIST_HEAD(&conn->xmitqueue);
1889 INIT_LIST_HEAD(&conn->requeue);
1890 INIT_WORK(&conn->xmitwork, iscsi_xmitworker);
1891
1892 /* allocate login_mtask used for the login/text sequences */
1893 spin_lock_bh(&session->lock);
1894 if (!__kfifo_get(session->mgmtpool.queue,
1895 (void*)&conn->login_mtask,
1896 sizeof(void*))) {
1897 spin_unlock_bh(&session->lock);
1898 goto login_mtask_alloc_fail;
1899 }
1900 spin_unlock_bh(&session->lock);
1901
1902 data = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN, GFP_KERNEL);
1903 if (!data)
1904 goto login_mtask_data_alloc_fail;
1905 conn->login_mtask->data = conn->data = data;
1906
1907 init_timer(&conn->tmf_timer);
1908 init_waitqueue_head(&conn->ehwait);
1909
1910 return cls_conn;
1911
1912 login_mtask_data_alloc_fail:
1913 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
1914 sizeof(void*));
1915 login_mtask_alloc_fail:
1916 iscsi_destroy_conn(cls_conn);
1917 return NULL;
1918 }
1919 EXPORT_SYMBOL_GPL(iscsi_conn_setup);
1920
1921 /**
1922 * iscsi_conn_teardown - teardown iscsi connection
1923 * cls_conn: iscsi class connection
1924 *
1925 * TODO: we may need to make this into a two step process
1926 * like scsi-mls remove + put host
1927 */
1928 void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
1929 {
1930 struct iscsi_conn *conn = cls_conn->dd_data;
1931 struct iscsi_session *session = conn->session;
1932 unsigned long flags;
1933
1934 del_timer_sync(&conn->transport_timer);
1935
1936 spin_lock_bh(&session->lock);
1937 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
1938 if (session->leadconn == conn) {
1939 /*
1940 * leading connection? then give up on recovery.
1941 */
1942 session->state = ISCSI_STATE_TERMINATE;
1943 wake_up(&conn->ehwait);
1944 }
1945 spin_unlock_bh(&session->lock);
1946
1947 /*
1948 * Block until all in-progress commands for this connection
1949 * time out or fail.
1950 */
1951 for (;;) {
1952 spin_lock_irqsave(session->host->host_lock, flags);
1953 if (!session->host->host_busy) { /* OK for ERL == 0 */
1954 spin_unlock_irqrestore(session->host->host_lock, flags);
1955 break;
1956 }
1957 spin_unlock_irqrestore(session->host->host_lock, flags);
1958 msleep_interruptible(500);
1959 iscsi_conn_printk(KERN_INFO, conn, "iscsi conn_destroy(): "
1960 "host_busy %d host_failed %d\n",
1961 session->host->host_busy,
1962 session->host->host_failed);
1963 /*
1964 * force eh_abort() to unblock
1965 */
1966 wake_up(&conn->ehwait);
1967 }
1968
1969 /* flush queued up work because we free the connection below */
1970 iscsi_suspend_tx(conn);
1971
1972 spin_lock_bh(&session->lock);
1973 kfree(conn->data);
1974 kfree(conn->persistent_address);
1975 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
1976 sizeof(void*));
1977 if (session->leadconn == conn)
1978 session->leadconn = NULL;
1979 spin_unlock_bh(&session->lock);
1980
1981 iscsi_destroy_conn(cls_conn);
1982 }
1983 EXPORT_SYMBOL_GPL(iscsi_conn_teardown);
1984
1985 int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
1986 {
1987 struct iscsi_conn *conn = cls_conn->dd_data;
1988 struct iscsi_session *session = conn->session;
1989
1990 if (!session) {
1991 iscsi_conn_printk(KERN_ERR, conn,
1992 "can't start unbound connection\n");
1993 return -EPERM;
1994 }
1995
1996 if ((session->imm_data_en || !session->initial_r2t_en) &&
1997 session->first_burst > session->max_burst) {
1998 iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: "
1999 "first_burst %d max_burst %d\n",
2000 session->first_burst, session->max_burst);
2001 return -EINVAL;
2002 }
2003
2004 if (conn->ping_timeout && !conn->recv_timeout) {
2005 iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of "
2006 "zero. Using 5 seconds\n.");
2007 conn->recv_timeout = 5;
2008 }
2009
2010 if (conn->recv_timeout && !conn->ping_timeout) {
2011 iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of "
2012 "zero. Using 5 seconds.\n");
2013 conn->ping_timeout = 5;
2014 }
2015
2016 spin_lock_bh(&session->lock);
2017 conn->c_stage = ISCSI_CONN_STARTED;
2018 session->state = ISCSI_STATE_LOGGED_IN;
2019 session->queued_cmdsn = session->cmdsn;
2020
2021 conn->last_recv = jiffies;
2022 conn->last_ping = jiffies;
2023 if (conn->recv_timeout && conn->ping_timeout)
2024 mod_timer(&conn->transport_timer,
2025 jiffies + (conn->recv_timeout * HZ));
2026
2027 switch(conn->stop_stage) {
2028 case STOP_CONN_RECOVER:
2029 /*
2030 * unblock eh_abort() if it is blocked. re-try all
2031 * commands after successful recovery
2032 */
2033 conn->stop_stage = 0;
2034 conn->tmf_state = TMF_INITIAL;
2035 session->age++;
2036 if (session->age == 16)
2037 session->age = 0;
2038 break;
2039 case STOP_CONN_TERM:
2040 conn->stop_stage = 0;
2041 break;
2042 default:
2043 break;
2044 }
2045 spin_unlock_bh(&session->lock);
2046
2047 iscsi_unblock_session(session_to_cls(session));
2048 wake_up(&conn->ehwait);
2049 return 0;
2050 }
2051 EXPORT_SYMBOL_GPL(iscsi_conn_start);
2052
2053 static void
2054 flush_control_queues(struct iscsi_session *session, struct iscsi_conn *conn)
2055 {
2056 struct iscsi_mgmt_task *mtask, *tmp;
2057
2058 /* handle pending */
2059 list_for_each_entry_safe(mtask, tmp, &conn->mgmtqueue, running) {
2060 debug_scsi("flushing pending mgmt task itt 0x%x\n", mtask->itt);
2061 iscsi_free_mgmt_task(conn, mtask);
2062 }
2063
2064 /* handle running */
2065 list_for_each_entry_safe(mtask, tmp, &conn->mgmt_run_list, running) {
2066 debug_scsi("flushing running mgmt task itt 0x%x\n", mtask->itt);
2067 iscsi_free_mgmt_task(conn, mtask);
2068 }
2069
2070 conn->mtask = NULL;
2071 }
2072
2073 static void iscsi_start_session_recovery(struct iscsi_session *session,
2074 struct iscsi_conn *conn, int flag)
2075 {
2076 int old_stop_stage;
2077
2078 del_timer_sync(&conn->transport_timer);
2079
2080 mutex_lock(&session->eh_mutex);
2081 spin_lock_bh(&session->lock);
2082 if (conn->stop_stage == STOP_CONN_TERM) {
2083 spin_unlock_bh(&session->lock);
2084 mutex_unlock(&session->eh_mutex);
2085 return;
2086 }
2087
2088 /*
2089 * The LLD either freed/unset the lock on us, or userspace called
2090 * stop but did not create a proper connection (connection was never
2091 * bound or it was unbound then stop was called).
2092 */
2093 if (!conn->recv_lock) {
2094 spin_unlock_bh(&session->lock);
2095 mutex_unlock(&session->eh_mutex);
2096 return;
2097 }
2098
2099 /*
2100 * When this is called for the in_login state, we only want to clean
2101 * up the login task and connection. We do not need to block and set
2102 * the recovery state again
2103 */
2104 if (flag == STOP_CONN_TERM)
2105 session->state = ISCSI_STATE_TERMINATE;
2106 else if (conn->stop_stage != STOP_CONN_RECOVER)
2107 session->state = ISCSI_STATE_IN_RECOVERY;
2108
2109 old_stop_stage = conn->stop_stage;
2110 conn->stop_stage = flag;
2111 conn->c_stage = ISCSI_CONN_STOPPED;
2112 spin_unlock_bh(&session->lock);
2113
2114 iscsi_suspend_tx(conn);
2115
2116 write_lock_bh(conn->recv_lock);
2117 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
2118 write_unlock_bh(conn->recv_lock);
2119
2120 /*
2121 * for connection level recovery we should not calculate
2122 * header digest. conn->hdr_size used for optimization
2123 * in hdr_extract() and will be re-negotiated at
2124 * set_param() time.
2125 */
2126 if (flag == STOP_CONN_RECOVER) {
2127 conn->hdrdgst_en = 0;
2128 conn->datadgst_en = 0;
2129 if (session->state == ISCSI_STATE_IN_RECOVERY &&
2130 old_stop_stage != STOP_CONN_RECOVER) {
2131 debug_scsi("blocking session\n");
2132 iscsi_block_session(session_to_cls(session));
2133 }
2134 }
2135
2136 /*
2137 * flush queues.
2138 */
2139 spin_lock_bh(&session->lock);
2140 fail_all_commands(conn, -1,
2141 STOP_CONN_RECOVER ? DID_BUS_BUSY : DID_ERROR);
2142 flush_control_queues(session, conn);
2143 spin_unlock_bh(&session->lock);
2144 mutex_unlock(&session->eh_mutex);
2145 }
2146
2147 void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
2148 {
2149 struct iscsi_conn *conn = cls_conn->dd_data;
2150 struct iscsi_session *session = conn->session;
2151
2152 switch (flag) {
2153 case STOP_CONN_RECOVER:
2154 case STOP_CONN_TERM:
2155 iscsi_start_session_recovery(session, conn, flag);
2156 break;
2157 default:
2158 iscsi_conn_printk(KERN_ERR, conn,
2159 "invalid stop flag %d\n", flag);
2160 }
2161 }
2162 EXPORT_SYMBOL_GPL(iscsi_conn_stop);
2163
2164 int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
2165 struct iscsi_cls_conn *cls_conn, int is_leading)
2166 {
2167 struct iscsi_session *session = class_to_transport_session(cls_session);
2168 struct iscsi_conn *conn = cls_conn->dd_data;
2169
2170 spin_lock_bh(&session->lock);
2171 if (is_leading)
2172 session->leadconn = conn;
2173 spin_unlock_bh(&session->lock);
2174
2175 /*
2176 * Unblock xmitworker(), Login Phase will pass through.
2177 */
2178 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
2179 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
2180 return 0;
2181 }
2182 EXPORT_SYMBOL_GPL(iscsi_conn_bind);
2183
2184
2185 int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
2186 enum iscsi_param param, char *buf, int buflen)
2187 {
2188 struct iscsi_conn *conn = cls_conn->dd_data;
2189 struct iscsi_session *session = conn->session;
2190 uint32_t value;
2191
2192 switch(param) {
2193 case ISCSI_PARAM_FAST_ABORT:
2194 sscanf(buf, "%d", &session->fast_abort);
2195 break;
2196 case ISCSI_PARAM_ABORT_TMO:
2197 sscanf(buf, "%d", &session->abort_timeout);
2198 break;
2199 case ISCSI_PARAM_LU_RESET_TMO:
2200 sscanf(buf, "%d", &session->lu_reset_timeout);
2201 break;
2202 case ISCSI_PARAM_PING_TMO:
2203 sscanf(buf, "%d", &conn->ping_timeout);
2204 break;
2205 case ISCSI_PARAM_RECV_TMO:
2206 sscanf(buf, "%d", &conn->recv_timeout);
2207 break;
2208 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2209 sscanf(buf, "%d", &conn->max_recv_dlength);
2210 break;
2211 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2212 sscanf(buf, "%d", &conn->max_xmit_dlength);
2213 break;
2214 case ISCSI_PARAM_HDRDGST_EN:
2215 sscanf(buf, "%d", &conn->hdrdgst_en);
2216 break;
2217 case ISCSI_PARAM_DATADGST_EN:
2218 sscanf(buf, "%d", &conn->datadgst_en);
2219 break;
2220 case ISCSI_PARAM_INITIAL_R2T_EN:
2221 sscanf(buf, "%d", &session->initial_r2t_en);
2222 break;
2223 case ISCSI_PARAM_MAX_R2T:
2224 sscanf(buf, "%d", &session->max_r2t);
2225 break;
2226 case ISCSI_PARAM_IMM_DATA_EN:
2227 sscanf(buf, "%d", &session->imm_data_en);
2228 break;
2229 case ISCSI_PARAM_FIRST_BURST:
2230 sscanf(buf, "%d", &session->first_burst);
2231 break;
2232 case ISCSI_PARAM_MAX_BURST:
2233 sscanf(buf, "%d", &session->max_burst);
2234 break;
2235 case ISCSI_PARAM_PDU_INORDER_EN:
2236 sscanf(buf, "%d", &session->pdu_inorder_en);
2237 break;
2238 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2239 sscanf(buf, "%d", &session->dataseq_inorder_en);
2240 break;
2241 case ISCSI_PARAM_ERL:
2242 sscanf(buf, "%d", &session->erl);
2243 break;
2244 case ISCSI_PARAM_IFMARKER_EN:
2245 sscanf(buf, "%d", &value);
2246 BUG_ON(value);
2247 break;
2248 case ISCSI_PARAM_OFMARKER_EN:
2249 sscanf(buf, "%d", &value);
2250 BUG_ON(value);
2251 break;
2252 case ISCSI_PARAM_EXP_STATSN:
2253 sscanf(buf, "%u", &conn->exp_statsn);
2254 break;
2255 case ISCSI_PARAM_USERNAME:
2256 kfree(session->username);
2257 session->username = kstrdup(buf, GFP_KERNEL);
2258 if (!session->username)
2259 return -ENOMEM;
2260 break;
2261 case ISCSI_PARAM_USERNAME_IN:
2262 kfree(session->username_in);
2263 session->username_in = kstrdup(buf, GFP_KERNEL);
2264 if (!session->username_in)
2265 return -ENOMEM;
2266 break;
2267 case ISCSI_PARAM_PASSWORD:
2268 kfree(session->password);
2269 session->password = kstrdup(buf, GFP_KERNEL);
2270 if (!session->password)
2271 return -ENOMEM;
2272 break;
2273 case ISCSI_PARAM_PASSWORD_IN:
2274 kfree(session->password_in);
2275 session->password_in = kstrdup(buf, GFP_KERNEL);
2276 if (!session->password_in)
2277 return -ENOMEM;
2278 break;
2279 case ISCSI_PARAM_TARGET_NAME:
2280 /* this should not change between logins */
2281 if (session->targetname)
2282 break;
2283
2284 session->targetname = kstrdup(buf, GFP_KERNEL);
2285 if (!session->targetname)
2286 return -ENOMEM;
2287 break;
2288 case ISCSI_PARAM_TPGT:
2289 sscanf(buf, "%d", &session->tpgt);
2290 break;
2291 case ISCSI_PARAM_PERSISTENT_PORT:
2292 sscanf(buf, "%d", &conn->persistent_port);
2293 break;
2294 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2295 /*
2296 * this is the address returned in discovery so it should
2297 * not change between logins.
2298 */
2299 if (conn->persistent_address)
2300 break;
2301
2302 conn->persistent_address = kstrdup(buf, GFP_KERNEL);
2303 if (!conn->persistent_address)
2304 return -ENOMEM;
2305 break;
2306 default:
2307 return -ENOSYS;
2308 }
2309
2310 return 0;
2311 }
2312 EXPORT_SYMBOL_GPL(iscsi_set_param);
2313
2314 int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
2315 enum iscsi_param param, char *buf)
2316 {
2317 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
2318 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
2319 int len;
2320
2321 switch(param) {
2322 case ISCSI_PARAM_FAST_ABORT:
2323 len = sprintf(buf, "%d\n", session->fast_abort);
2324 break;
2325 case ISCSI_PARAM_ABORT_TMO:
2326 len = sprintf(buf, "%d\n", session->abort_timeout);
2327 break;
2328 case ISCSI_PARAM_LU_RESET_TMO:
2329 len = sprintf(buf, "%d\n", session->lu_reset_timeout);
2330 break;
2331 case ISCSI_PARAM_INITIAL_R2T_EN:
2332 len = sprintf(buf, "%d\n", session->initial_r2t_en);
2333 break;
2334 case ISCSI_PARAM_MAX_R2T:
2335 len = sprintf(buf, "%hu\n", session->max_r2t);
2336 break;
2337 case ISCSI_PARAM_IMM_DATA_EN:
2338 len = sprintf(buf, "%d\n", session->imm_data_en);
2339 break;
2340 case ISCSI_PARAM_FIRST_BURST:
2341 len = sprintf(buf, "%u\n", session->first_burst);
2342 break;
2343 case ISCSI_PARAM_MAX_BURST:
2344 len = sprintf(buf, "%u\n", session->max_burst);
2345 break;
2346 case ISCSI_PARAM_PDU_INORDER_EN:
2347 len = sprintf(buf, "%d\n", session->pdu_inorder_en);
2348 break;
2349 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2350 len = sprintf(buf, "%d\n", session->dataseq_inorder_en);
2351 break;
2352 case ISCSI_PARAM_ERL:
2353 len = sprintf(buf, "%d\n", session->erl);
2354 break;
2355 case ISCSI_PARAM_TARGET_NAME:
2356 len = sprintf(buf, "%s\n", session->targetname);
2357 break;
2358 case ISCSI_PARAM_TPGT:
2359 len = sprintf(buf, "%d\n", session->tpgt);
2360 break;
2361 case ISCSI_PARAM_USERNAME:
2362 len = sprintf(buf, "%s\n", session->username);
2363 break;
2364 case ISCSI_PARAM_USERNAME_IN:
2365 len = sprintf(buf, "%s\n", session->username_in);
2366 break;
2367 case ISCSI_PARAM_PASSWORD:
2368 len = sprintf(buf, "%s\n", session->password);
2369 break;
2370 case ISCSI_PARAM_PASSWORD_IN:
2371 len = sprintf(buf, "%s\n", session->password_in);
2372 break;
2373 default:
2374 return -ENOSYS;
2375 }
2376
2377 return len;
2378 }
2379 EXPORT_SYMBOL_GPL(iscsi_session_get_param);
2380
2381 int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
2382 enum iscsi_param param, char *buf)
2383 {
2384 struct iscsi_conn *conn = cls_conn->dd_data;
2385 int len;
2386
2387 switch(param) {
2388 case ISCSI_PARAM_PING_TMO:
2389 len = sprintf(buf, "%u\n", conn->ping_timeout);
2390 break;
2391 case ISCSI_PARAM_RECV_TMO:
2392 len = sprintf(buf, "%u\n", conn->recv_timeout);
2393 break;
2394 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2395 len = sprintf(buf, "%u\n", conn->max_recv_dlength);
2396 break;
2397 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2398 len = sprintf(buf, "%u\n", conn->max_xmit_dlength);
2399 break;
2400 case ISCSI_PARAM_HDRDGST_EN:
2401 len = sprintf(buf, "%d\n", conn->hdrdgst_en);
2402 break;
2403 case ISCSI_PARAM_DATADGST_EN:
2404 len = sprintf(buf, "%d\n", conn->datadgst_en);
2405 break;
2406 case ISCSI_PARAM_IFMARKER_EN:
2407 len = sprintf(buf, "%d\n", conn->ifmarker_en);
2408 break;
2409 case ISCSI_PARAM_OFMARKER_EN:
2410 len = sprintf(buf, "%d\n", conn->ofmarker_en);
2411 break;
2412 case ISCSI_PARAM_EXP_STATSN:
2413 len = sprintf(buf, "%u\n", conn->exp_statsn);
2414 break;
2415 case ISCSI_PARAM_PERSISTENT_PORT:
2416 len = sprintf(buf, "%d\n", conn->persistent_port);
2417 break;
2418 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2419 len = sprintf(buf, "%s\n", conn->persistent_address);
2420 break;
2421 default:
2422 return -ENOSYS;
2423 }
2424
2425 return len;
2426 }
2427 EXPORT_SYMBOL_GPL(iscsi_conn_get_param);
2428
2429 int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2430 char *buf)
2431 {
2432 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
2433 int len;
2434
2435 switch (param) {
2436 case ISCSI_HOST_PARAM_NETDEV_NAME:
2437 if (!session->netdev)
2438 len = sprintf(buf, "%s\n", "default");
2439 else
2440 len = sprintf(buf, "%s\n", session->netdev);
2441 break;
2442 case ISCSI_HOST_PARAM_HWADDRESS:
2443 if (!session->hwaddress)
2444 len = sprintf(buf, "%s\n", "default");
2445 else
2446 len = sprintf(buf, "%s\n", session->hwaddress);
2447 break;
2448 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2449 if (!session->initiatorname)
2450 len = sprintf(buf, "%s\n", "unknown");
2451 else
2452 len = sprintf(buf, "%s\n", session->initiatorname);
2453 break;
2454
2455 default:
2456 return -ENOSYS;
2457 }
2458
2459 return len;
2460 }
2461 EXPORT_SYMBOL_GPL(iscsi_host_get_param);
2462
2463 int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2464 char *buf, int buflen)
2465 {
2466 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
2467
2468 switch (param) {
2469 case ISCSI_HOST_PARAM_NETDEV_NAME:
2470 if (!session->netdev)
2471 session->netdev = kstrdup(buf, GFP_KERNEL);
2472 break;
2473 case ISCSI_HOST_PARAM_HWADDRESS:
2474 if (!session->hwaddress)
2475 session->hwaddress = kstrdup(buf, GFP_KERNEL);
2476 break;
2477 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2478 if (!session->initiatorname)
2479 session->initiatorname = kstrdup(buf, GFP_KERNEL);
2480 break;
2481 default:
2482 return -ENOSYS;
2483 }
2484
2485 return 0;
2486 }
2487 EXPORT_SYMBOL_GPL(iscsi_host_set_param);
2488
2489 MODULE_AUTHOR("Mike Christie");
2490 MODULE_DESCRIPTION("iSCSI library functions");
2491 MODULE_LICENSE("GPL");
WRT350N Kernel Patches