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au1550_spi: fix prototype of irq handler
[wrt350n-kernel.git] / drivers / scsi / libiscsi.c
blobbdd7de7da39a5819cea137dcb5b083f6f69a8d3c
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 if (!is_power_of_2(cmds_max) || cmds_max >= ISCSI_MGMT_ITT_OFFSET ||
1712 cmds_max < 2) {
1713 if (cmds_max != 0)
1714 printk(KERN_ERR "iscsi: invalid can_queue of %d. "
1715 "can_queue must be a power of 2 and between "
1716 "2 and %d - setting to %d.\n", cmds_max,
1717 ISCSI_MGMT_ITT_OFFSET, ISCSI_DEF_XMIT_CMDS_MAX);
1718 cmds_max = ISCSI_DEF_XMIT_CMDS_MAX;
1719 }
1720
1721 shost = scsi_host_alloc(iscsit->host_template,
1722 hostdata_privsize(sizeof(*session)));
1723 if (!shost)
1724 return NULL;
1725
1726 /* the iscsi layer takes one task for reserve */
1727 shost->can_queue = cmds_max - 1;
1728 shost->cmd_per_lun = qdepth;
1729 shost->max_id = 1;
1730 shost->max_channel = 0;
1731 shost->max_lun = iscsit->max_lun;
1732 shost->max_cmd_len = iscsit->max_cmd_len;
1733 shost->transportt = scsit;
1734 shost->transportt->create_work_queue = 1;
1735 shost->transportt->eh_timed_out = iscsi_eh_cmd_timed_out;
1736 *hostno = shost->host_no;
1737
1738 session = iscsi_hostdata(shost->hostdata);
1739 memset(session, 0, sizeof(struct iscsi_session));
1740 session->host = shost;
1741 session->state = ISCSI_STATE_FREE;
1742 session->fast_abort = 1;
1743 session->lu_reset_timeout = 15;
1744 session->abort_timeout = 10;
1745 session->mgmtpool_max = ISCSI_MGMT_CMDS_MAX;
1746 session->cmds_max = cmds_max;
1747 session->queued_cmdsn = session->cmdsn = initial_cmdsn;
1748 session->exp_cmdsn = initial_cmdsn + 1;
1749 session->max_cmdsn = initial_cmdsn + 1;
1750 session->max_r2t = 1;
1751 session->tt = iscsit;
1752 mutex_init(&session->eh_mutex);
1753
1754 /* initialize SCSI PDU commands pool */
1755 if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
1756 (void***)&session->cmds,
1757 cmd_task_size + sizeof(struct iscsi_cmd_task)))
1758 goto cmdpool_alloc_fail;
1759
1760 /* pre-format cmds pool with ITT */
1761 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
1762 struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
1763
1764 if (cmd_task_size)
1765 ctask->dd_data = &ctask[1];
1766 ctask->itt = cmd_i;
1767 INIT_LIST_HEAD(&ctask->running);
1768 }
1769
1770 spin_lock_init(&session->lock);
1771
1772 /* initialize immediate command pool */
1773 if (iscsi_pool_init(&session->mgmtpool, session->mgmtpool_max,
1774 (void***)&session->mgmt_cmds,
1775 mgmt_task_size + sizeof(struct iscsi_mgmt_task)))
1776 goto mgmtpool_alloc_fail;
1777
1778
1779 /* pre-format immediate cmds pool with ITT */
1780 for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) {
1781 struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i];
1782
1783 if (mgmt_task_size)
1784 mtask->dd_data = &mtask[1];
1785 mtask->itt = ISCSI_MGMT_ITT_OFFSET + cmd_i;
1786 INIT_LIST_HEAD(&mtask->running);
1787 }
1788
1789 if (scsi_add_host(shost, NULL))
1790 goto add_host_fail;
1791
1792 if (!try_module_get(iscsit->owner))
1793 goto cls_session_fail;
1794
1795 cls_session = iscsi_create_session(shost, iscsit, 0);
1796 if (!cls_session)
1797 goto module_put;
1798 *(unsigned long*)shost->hostdata = (unsigned long)cls_session;
1799
1800 return cls_session;
1801
1802 module_put:
1803 module_put(iscsit->owner);
1804 cls_session_fail:
1805 scsi_remove_host(shost);
1806 add_host_fail:
1807 iscsi_pool_free(&session->mgmtpool);
1808 mgmtpool_alloc_fail:
1809 iscsi_pool_free(&session->cmdpool);
1810 cmdpool_alloc_fail:
1811 scsi_host_put(shost);
1812 return NULL;
1813 }
1814 EXPORT_SYMBOL_GPL(iscsi_session_setup);
1815
1816 /**
1817 * iscsi_session_teardown - destroy session, host, and cls_session
1818 * shost: scsi host
1819 *
1820 * This can be used by software iscsi_transports that allocate
1821 * a session per scsi host.
1822 **/
1823 void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
1824 {
1825 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
1826 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
1827 struct module *owner = cls_session->transport->owner;
1828
1829 iscsi_remove_session(cls_session);
1830 scsi_remove_host(shost);
1831
1832 iscsi_pool_free(&session->mgmtpool);
1833 iscsi_pool_free(&session->cmdpool);
1834
1835 kfree(session->password);
1836 kfree(session->password_in);
1837 kfree(session->username);
1838 kfree(session->username_in);
1839 kfree(session->targetname);
1840 kfree(session->netdev);
1841 kfree(session->hwaddress);
1842 kfree(session->initiatorname);
1843
1844 iscsi_free_session(cls_session);
1845 scsi_host_put(shost);
1846 module_put(owner);
1847 }
1848 EXPORT_SYMBOL_GPL(iscsi_session_teardown);
1849
1850 /**
1851 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
1852 * @cls_session: iscsi_cls_session
1853 * @conn_idx: cid
1854 **/
1855 struct iscsi_cls_conn *
1856 iscsi_conn_setup(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
1857 {
1858 struct iscsi_session *session = class_to_transport_session(cls_session);
1859 struct iscsi_conn *conn;
1860 struct iscsi_cls_conn *cls_conn;
1861 char *data;
1862
1863 cls_conn = iscsi_create_conn(cls_session, conn_idx);
1864 if (!cls_conn)
1865 return NULL;
1866 conn = cls_conn->dd_data;
1867 memset(conn, 0, sizeof(*conn));
1868
1869 conn->session = session;
1870 conn->cls_conn = cls_conn;
1871 conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
1872 conn->id = conn_idx;
1873 conn->exp_statsn = 0;
1874 conn->tmf_state = TMF_INITIAL;
1875
1876 init_timer(&conn->transport_timer);
1877 conn->transport_timer.data = (unsigned long)conn;
1878 conn->transport_timer.function = iscsi_check_transport_timeouts;
1879
1880 INIT_LIST_HEAD(&conn->run_list);
1881 INIT_LIST_HEAD(&conn->mgmt_run_list);
1882 INIT_LIST_HEAD(&conn->mgmtqueue);
1883 INIT_LIST_HEAD(&conn->xmitqueue);
1884 INIT_LIST_HEAD(&conn->requeue);
1885 INIT_WORK(&conn->xmitwork, iscsi_xmitworker);
1886
1887 /* allocate login_mtask used for the login/text sequences */
1888 spin_lock_bh(&session->lock);
1889 if (!__kfifo_get(session->mgmtpool.queue,
1890 (void*)&conn->login_mtask,
1891 sizeof(void*))) {
1892 spin_unlock_bh(&session->lock);
1893 goto login_mtask_alloc_fail;
1894 }
1895 spin_unlock_bh(&session->lock);
1896
1897 data = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN, GFP_KERNEL);
1898 if (!data)
1899 goto login_mtask_data_alloc_fail;
1900 conn->login_mtask->data = conn->data = data;
1901
1902 init_timer(&conn->tmf_timer);
1903 init_waitqueue_head(&conn->ehwait);
1904
1905 return cls_conn;
1906
1907 login_mtask_data_alloc_fail:
1908 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
1909 sizeof(void*));
1910 login_mtask_alloc_fail:
1911 iscsi_destroy_conn(cls_conn);
1912 return NULL;
1913 }
1914 EXPORT_SYMBOL_GPL(iscsi_conn_setup);
1915
1916 /**
1917 * iscsi_conn_teardown - teardown iscsi connection
1918 * cls_conn: iscsi class connection
1919 *
1920 * TODO: we may need to make this into a two step process
1921 * like scsi-mls remove + put host
1922 */
1923 void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
1924 {
1925 struct iscsi_conn *conn = cls_conn->dd_data;
1926 struct iscsi_session *session = conn->session;
1927 unsigned long flags;
1928
1929 del_timer_sync(&conn->transport_timer);
1930
1931 spin_lock_bh(&session->lock);
1932 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
1933 if (session->leadconn == conn) {
1934 /*
1935 * leading connection? then give up on recovery.
1936 */
1937 session->state = ISCSI_STATE_TERMINATE;
1938 wake_up(&conn->ehwait);
1939 }
1940 spin_unlock_bh(&session->lock);
1941
1942 /*
1943 * Block until all in-progress commands for this connection
1944 * time out or fail.
1945 */
1946 for (;;) {
1947 spin_lock_irqsave(session->host->host_lock, flags);
1948 if (!session->host->host_busy) { /* OK for ERL == 0 */
1949 spin_unlock_irqrestore(session->host->host_lock, flags);
1950 break;
1951 }
1952 spin_unlock_irqrestore(session->host->host_lock, flags);
1953 msleep_interruptible(500);
1954 iscsi_conn_printk(KERN_INFO, conn, "iscsi conn_destroy(): "
1955 "host_busy %d host_failed %d\n",
1956 session->host->host_busy,
1957 session->host->host_failed);
1958 /*
1959 * force eh_abort() to unblock
1960 */
1961 wake_up(&conn->ehwait);
1962 }
1963
1964 /* flush queued up work because we free the connection below */
1965 iscsi_suspend_tx(conn);
1966
1967 spin_lock_bh(&session->lock);
1968 kfree(conn->data);
1969 kfree(conn->persistent_address);
1970 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
1971 sizeof(void*));
1972 if (session->leadconn == conn)
1973 session->leadconn = NULL;
1974 spin_unlock_bh(&session->lock);
1975
1976 iscsi_destroy_conn(cls_conn);
1977 }
1978 EXPORT_SYMBOL_GPL(iscsi_conn_teardown);
1979
1980 int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
1981 {
1982 struct iscsi_conn *conn = cls_conn->dd_data;
1983 struct iscsi_session *session = conn->session;
1984
1985 if (!session) {
1986 iscsi_conn_printk(KERN_ERR, conn,
1987 "can't start unbound connection\n");
1988 return -EPERM;
1989 }
1990
1991 if ((session->imm_data_en || !session->initial_r2t_en) &&
1992 session->first_burst > session->max_burst) {
1993 iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: "
1994 "first_burst %d max_burst %d\n",
1995 session->first_burst, session->max_burst);
1996 return -EINVAL;
1997 }
1998
1999 if (conn->ping_timeout && !conn->recv_timeout) {
2000 iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of "
2001 "zero. Using 5 seconds\n.");
2002 conn->recv_timeout = 5;
2003 }
2004
2005 if (conn->recv_timeout && !conn->ping_timeout) {
2006 iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of "
2007 "zero. Using 5 seconds.\n");
2008 conn->ping_timeout = 5;
2009 }
2010
2011 spin_lock_bh(&session->lock);
2012 conn->c_stage = ISCSI_CONN_STARTED;
2013 session->state = ISCSI_STATE_LOGGED_IN;
2014 session->queued_cmdsn = session->cmdsn;
2015
2016 conn->last_recv = jiffies;
2017 conn->last_ping = jiffies;
2018 if (conn->recv_timeout && conn->ping_timeout)
2019 mod_timer(&conn->transport_timer,
2020 jiffies + (conn->recv_timeout * HZ));
2021
2022 switch(conn->stop_stage) {
2023 case STOP_CONN_RECOVER:
2024 /*
2025 * unblock eh_abort() if it is blocked. re-try all
2026 * commands after successful recovery
2027 */
2028 conn->stop_stage = 0;
2029 conn->tmf_state = TMF_INITIAL;
2030 session->age++;
2031 if (session->age == 16)
2032 session->age = 0;
2033 break;
2034 case STOP_CONN_TERM:
2035 conn->stop_stage = 0;
2036 break;
2037 default:
2038 break;
2039 }
2040 spin_unlock_bh(&session->lock);
2041
2042 iscsi_unblock_session(session_to_cls(session));
2043 wake_up(&conn->ehwait);
2044 return 0;
2045 }
2046 EXPORT_SYMBOL_GPL(iscsi_conn_start);
2047
2048 static void
2049 flush_control_queues(struct iscsi_session *session, struct iscsi_conn *conn)
2050 {
2051 struct iscsi_mgmt_task *mtask, *tmp;
2052
2053 /* handle pending */
2054 list_for_each_entry_safe(mtask, tmp, &conn->mgmtqueue, running) {
2055 debug_scsi("flushing pending mgmt task itt 0x%x\n", mtask->itt);
2056 iscsi_free_mgmt_task(conn, mtask);
2057 }
2058
2059 /* handle running */
2060 list_for_each_entry_safe(mtask, tmp, &conn->mgmt_run_list, running) {
2061 debug_scsi("flushing running mgmt task itt 0x%x\n", mtask->itt);
2062 iscsi_free_mgmt_task(conn, mtask);
2063 }
2064
2065 conn->mtask = NULL;
2066 }
2067
2068 static void iscsi_start_session_recovery(struct iscsi_session *session,
2069 struct iscsi_conn *conn, int flag)
2070 {
2071 int old_stop_stage;
2072
2073 del_timer_sync(&conn->transport_timer);
2074
2075 mutex_lock(&session->eh_mutex);
2076 spin_lock_bh(&session->lock);
2077 if (conn->stop_stage == STOP_CONN_TERM) {
2078 spin_unlock_bh(&session->lock);
2079 mutex_unlock(&session->eh_mutex);
2080 return;
2081 }
2082
2083 /*
2084 * The LLD either freed/unset the lock on us, or userspace called
2085 * stop but did not create a proper connection (connection was never
2086 * bound or it was unbound then stop was called).
2087 */
2088 if (!conn->recv_lock) {
2089 spin_unlock_bh(&session->lock);
2090 mutex_unlock(&session->eh_mutex);
2091 return;
2092 }
2093
2094 /*
2095 * When this is called for the in_login state, we only want to clean
2096 * up the login task and connection. We do not need to block and set
2097 * the recovery state again
2098 */
2099 if (flag == STOP_CONN_TERM)
2100 session->state = ISCSI_STATE_TERMINATE;
2101 else if (conn->stop_stage != STOP_CONN_RECOVER)
2102 session->state = ISCSI_STATE_IN_RECOVERY;
2103
2104 old_stop_stage = conn->stop_stage;
2105 conn->stop_stage = flag;
2106 conn->c_stage = ISCSI_CONN_STOPPED;
2107 spin_unlock_bh(&session->lock);
2108
2109 iscsi_suspend_tx(conn);
2110
2111 write_lock_bh(conn->recv_lock);
2112 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
2113 write_unlock_bh(conn->recv_lock);
2114
2115 /*
2116 * for connection level recovery we should not calculate
2117 * header digest. conn->hdr_size used for optimization
2118 * in hdr_extract() and will be re-negotiated at
2119 * set_param() time.
2120 */
2121 if (flag == STOP_CONN_RECOVER) {
2122 conn->hdrdgst_en = 0;
2123 conn->datadgst_en = 0;
2124 if (session->state == ISCSI_STATE_IN_RECOVERY &&
2125 old_stop_stage != STOP_CONN_RECOVER) {
2126 debug_scsi("blocking session\n");
2127 iscsi_block_session(session_to_cls(session));
2128 }
2129 }
2130
2131 /*
2132 * flush queues.
2133 */
2134 spin_lock_bh(&session->lock);
2135 fail_all_commands(conn, -1,
2136 STOP_CONN_RECOVER ? DID_BUS_BUSY : DID_ERROR);
2137 flush_control_queues(session, conn);
2138 spin_unlock_bh(&session->lock);
2139 mutex_unlock(&session->eh_mutex);
2140 }
2141
2142 void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
2143 {
2144 struct iscsi_conn *conn = cls_conn->dd_data;
2145 struct iscsi_session *session = conn->session;
2146
2147 switch (flag) {
2148 case STOP_CONN_RECOVER:
2149 case STOP_CONN_TERM:
2150 iscsi_start_session_recovery(session, conn, flag);
2151 break;
2152 default:
2153 iscsi_conn_printk(KERN_ERR, conn,
2154 "invalid stop flag %d\n", flag);
2155 }
2156 }
2157 EXPORT_SYMBOL_GPL(iscsi_conn_stop);
2158
2159 int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
2160 struct iscsi_cls_conn *cls_conn, int is_leading)
2161 {
2162 struct iscsi_session *session = class_to_transport_session(cls_session);
2163 struct iscsi_conn *conn = cls_conn->dd_data;
2164
2165 spin_lock_bh(&session->lock);
2166 if (is_leading)
2167 session->leadconn = conn;
2168 spin_unlock_bh(&session->lock);
2169
2170 /*
2171 * Unblock xmitworker(), Login Phase will pass through.
2172 */
2173 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
2174 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
2175 return 0;
2176 }
2177 EXPORT_SYMBOL_GPL(iscsi_conn_bind);
2178
2179
2180 int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
2181 enum iscsi_param param, char *buf, int buflen)
2182 {
2183 struct iscsi_conn *conn = cls_conn->dd_data;
2184 struct iscsi_session *session = conn->session;
2185 uint32_t value;
2186
2187 switch(param) {
2188 case ISCSI_PARAM_FAST_ABORT:
2189 sscanf(buf, "%d", &session->fast_abort);
2190 break;
2191 case ISCSI_PARAM_ABORT_TMO:
2192 sscanf(buf, "%d", &session->abort_timeout);
2193 break;
2194 case ISCSI_PARAM_LU_RESET_TMO:
2195 sscanf(buf, "%d", &session->lu_reset_timeout);
2196 break;
2197 case ISCSI_PARAM_PING_TMO:
2198 sscanf(buf, "%d", &conn->ping_timeout);
2199 break;
2200 case ISCSI_PARAM_RECV_TMO:
2201 sscanf(buf, "%d", &conn->recv_timeout);
2202 break;
2203 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2204 sscanf(buf, "%d", &conn->max_recv_dlength);
2205 break;
2206 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2207 sscanf(buf, "%d", &conn->max_xmit_dlength);
2208 break;
2209 case ISCSI_PARAM_HDRDGST_EN:
2210 sscanf(buf, "%d", &conn->hdrdgst_en);
2211 break;
2212 case ISCSI_PARAM_DATADGST_EN:
2213 sscanf(buf, "%d", &conn->datadgst_en);
2214 break;
2215 case ISCSI_PARAM_INITIAL_R2T_EN:
2216 sscanf(buf, "%d", &session->initial_r2t_en);
2217 break;
2218 case ISCSI_PARAM_MAX_R2T:
2219 sscanf(buf, "%d", &session->max_r2t);
2220 break;
2221 case ISCSI_PARAM_IMM_DATA_EN:
2222 sscanf(buf, "%d", &session->imm_data_en);
2223 break;
2224 case ISCSI_PARAM_FIRST_BURST:
2225 sscanf(buf, "%d", &session->first_burst);
2226 break;
2227 case ISCSI_PARAM_MAX_BURST:
2228 sscanf(buf, "%d", &session->max_burst);
2229 break;
2230 case ISCSI_PARAM_PDU_INORDER_EN:
2231 sscanf(buf, "%d", &session->pdu_inorder_en);
2232 break;
2233 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2234 sscanf(buf, "%d", &session->dataseq_inorder_en);
2235 break;
2236 case ISCSI_PARAM_ERL:
2237 sscanf(buf, "%d", &session->erl);
2238 break;
2239 case ISCSI_PARAM_IFMARKER_EN:
2240 sscanf(buf, "%d", &value);
2241 BUG_ON(value);
2242 break;
2243 case ISCSI_PARAM_OFMARKER_EN:
2244 sscanf(buf, "%d", &value);
2245 BUG_ON(value);
2246 break;
2247 case ISCSI_PARAM_EXP_STATSN:
2248 sscanf(buf, "%u", &conn->exp_statsn);
2249 break;
2250 case ISCSI_PARAM_USERNAME:
2251 kfree(session->username);
2252 session->username = kstrdup(buf, GFP_KERNEL);
2253 if (!session->username)
2254 return -ENOMEM;
2255 break;
2256 case ISCSI_PARAM_USERNAME_IN:
2257 kfree(session->username_in);
2258 session->username_in = kstrdup(buf, GFP_KERNEL);
2259 if (!session->username_in)
2260 return -ENOMEM;
2261 break;
2262 case ISCSI_PARAM_PASSWORD:
2263 kfree(session->password);
2264 session->password = kstrdup(buf, GFP_KERNEL);
2265 if (!session->password)
2266 return -ENOMEM;
2267 break;
2268 case ISCSI_PARAM_PASSWORD_IN:
2269 kfree(session->password_in);
2270 session->password_in = kstrdup(buf, GFP_KERNEL);
2271 if (!session->password_in)
2272 return -ENOMEM;
2273 break;
2274 case ISCSI_PARAM_TARGET_NAME:
2275 /* this should not change between logins */
2276 if (session->targetname)
2277 break;
2278
2279 session->targetname = kstrdup(buf, GFP_KERNEL);
2280 if (!session->targetname)
2281 return -ENOMEM;
2282 break;
2283 case ISCSI_PARAM_TPGT:
2284 sscanf(buf, "%d", &session->tpgt);
2285 break;
2286 case ISCSI_PARAM_PERSISTENT_PORT:
2287 sscanf(buf, "%d", &conn->persistent_port);
2288 break;
2289 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2290 /*
2291 * this is the address returned in discovery so it should
2292 * not change between logins.
2293 */
2294 if (conn->persistent_address)
2295 break;
2296
2297 conn->persistent_address = kstrdup(buf, GFP_KERNEL);
2298 if (!conn->persistent_address)
2299 return -ENOMEM;
2300 break;
2301 default:
2302 return -ENOSYS;
2303 }
2304
2305 return 0;
2306 }
2307 EXPORT_SYMBOL_GPL(iscsi_set_param);
2308
2309 int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
2310 enum iscsi_param param, char *buf)
2311 {
2312 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
2313 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
2314 int len;
2315
2316 switch(param) {
2317 case ISCSI_PARAM_FAST_ABORT:
2318 len = sprintf(buf, "%d\n", session->fast_abort);
2319 break;
2320 case ISCSI_PARAM_ABORT_TMO:
2321 len = sprintf(buf, "%d\n", session->abort_timeout);
2322 break;
2323 case ISCSI_PARAM_LU_RESET_TMO:
2324 len = sprintf(buf, "%d\n", session->lu_reset_timeout);
2325 break;
2326 case ISCSI_PARAM_INITIAL_R2T_EN:
2327 len = sprintf(buf, "%d\n", session->initial_r2t_en);
2328 break;
2329 case ISCSI_PARAM_MAX_R2T:
2330 len = sprintf(buf, "%hu\n", session->max_r2t);
2331 break;
2332 case ISCSI_PARAM_IMM_DATA_EN:
2333 len = sprintf(buf, "%d\n", session->imm_data_en);
2334 break;
2335 case ISCSI_PARAM_FIRST_BURST:
2336 len = sprintf(buf, "%u\n", session->first_burst);
2337 break;
2338 case ISCSI_PARAM_MAX_BURST:
2339 len = sprintf(buf, "%u\n", session->max_burst);
2340 break;
2341 case ISCSI_PARAM_PDU_INORDER_EN:
2342 len = sprintf(buf, "%d\n", session->pdu_inorder_en);
2343 break;
2344 case ISCSI_PARAM_DATASEQ_INORDER_EN:
2345 len = sprintf(buf, "%d\n", session->dataseq_inorder_en);
2346 break;
2347 case ISCSI_PARAM_ERL:
2348 len = sprintf(buf, "%d\n", session->erl);
2349 break;
2350 case ISCSI_PARAM_TARGET_NAME:
2351 len = sprintf(buf, "%s\n", session->targetname);
2352 break;
2353 case ISCSI_PARAM_TPGT:
2354 len = sprintf(buf, "%d\n", session->tpgt);
2355 break;
2356 case ISCSI_PARAM_USERNAME:
2357 len = sprintf(buf, "%s\n", session->username);
2358 break;
2359 case ISCSI_PARAM_USERNAME_IN:
2360 len = sprintf(buf, "%s\n", session->username_in);
2361 break;
2362 case ISCSI_PARAM_PASSWORD:
2363 len = sprintf(buf, "%s\n", session->password);
2364 break;
2365 case ISCSI_PARAM_PASSWORD_IN:
2366 len = sprintf(buf, "%s\n", session->password_in);
2367 break;
2368 default:
2369 return -ENOSYS;
2370 }
2371
2372 return len;
2373 }
2374 EXPORT_SYMBOL_GPL(iscsi_session_get_param);
2375
2376 int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
2377 enum iscsi_param param, char *buf)
2378 {
2379 struct iscsi_conn *conn = cls_conn->dd_data;
2380 int len;
2381
2382 switch(param) {
2383 case ISCSI_PARAM_PING_TMO:
2384 len = sprintf(buf, "%u\n", conn->ping_timeout);
2385 break;
2386 case ISCSI_PARAM_RECV_TMO:
2387 len = sprintf(buf, "%u\n", conn->recv_timeout);
2388 break;
2389 case ISCSI_PARAM_MAX_RECV_DLENGTH:
2390 len = sprintf(buf, "%u\n", conn->max_recv_dlength);
2391 break;
2392 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
2393 len = sprintf(buf, "%u\n", conn->max_xmit_dlength);
2394 break;
2395 case ISCSI_PARAM_HDRDGST_EN:
2396 len = sprintf(buf, "%d\n", conn->hdrdgst_en);
2397 break;
2398 case ISCSI_PARAM_DATADGST_EN:
2399 len = sprintf(buf, "%d\n", conn->datadgst_en);
2400 break;
2401 case ISCSI_PARAM_IFMARKER_EN:
2402 len = sprintf(buf, "%d\n", conn->ifmarker_en);
2403 break;
2404 case ISCSI_PARAM_OFMARKER_EN:
2405 len = sprintf(buf, "%d\n", conn->ofmarker_en);
2406 break;
2407 case ISCSI_PARAM_EXP_STATSN:
2408 len = sprintf(buf, "%u\n", conn->exp_statsn);
2409 break;
2410 case ISCSI_PARAM_PERSISTENT_PORT:
2411 len = sprintf(buf, "%d\n", conn->persistent_port);
2412 break;
2413 case ISCSI_PARAM_PERSISTENT_ADDRESS:
2414 len = sprintf(buf, "%s\n", conn->persistent_address);
2415 break;
2416 default:
2417 return -ENOSYS;
2418 }
2419
2420 return len;
2421 }
2422 EXPORT_SYMBOL_GPL(iscsi_conn_get_param);
2423
2424 int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2425 char *buf)
2426 {
2427 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
2428 int len;
2429
2430 switch (param) {
2431 case ISCSI_HOST_PARAM_NETDEV_NAME:
2432 if (!session->netdev)
2433 len = sprintf(buf, "%s\n", "default");
2434 else
2435 len = sprintf(buf, "%s\n", session->netdev);
2436 break;
2437 case ISCSI_HOST_PARAM_HWADDRESS:
2438 if (!session->hwaddress)
2439 len = sprintf(buf, "%s\n", "default");
2440 else
2441 len = sprintf(buf, "%s\n", session->hwaddress);
2442 break;
2443 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2444 if (!session->initiatorname)
2445 len = sprintf(buf, "%s\n", "unknown");
2446 else
2447 len = sprintf(buf, "%s\n", session->initiatorname);
2448 break;
2449
2450 default:
2451 return -ENOSYS;
2452 }
2453
2454 return len;
2455 }
2456 EXPORT_SYMBOL_GPL(iscsi_host_get_param);
2457
2458 int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2459 char *buf, int buflen)
2460 {
2461 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
2462
2463 switch (param) {
2464 case ISCSI_HOST_PARAM_NETDEV_NAME:
2465 if (!session->netdev)
2466 session->netdev = kstrdup(buf, GFP_KERNEL);
2467 break;
2468 case ISCSI_HOST_PARAM_HWADDRESS:
2469 if (!session->hwaddress)
2470 session->hwaddress = kstrdup(buf, GFP_KERNEL);
2471 break;
2472 case ISCSI_HOST_PARAM_INITIATOR_NAME:
2473 if (!session->initiatorname)
2474 session->initiatorname = kstrdup(buf, GFP_KERNEL);
2475 break;
2476 default:
2477 return -ENOSYS;
2478 }
2479
2480 return 0;
2481 }
2482 EXPORT_SYMBOL_GPL(iscsi_host_set_param);
2483
2484 MODULE_AUTHOR("Mike Christie");
2485 MODULE_DESCRIPTION("iSCSI library functions");
2486 MODULE_LICENSE("GPL");
WRT350N Kernel Patches