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[SCSI] iscsi bugfixes: reduce memory allocations
[linux-2.6-block.git] / drivers / scsi / libiscsi.c
CommitLineData
7996a778
MC		 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/mutex.h>
26#include <linux/kfifo.h>
27#include <linux/delay.h>
28#include <net/tcp.h>
29#include <scsi/scsi_cmnd.h>
30#include <scsi/scsi_device.h>
31#include <scsi/scsi_eh.h>
32#include <scsi/scsi_tcq.h>
33#include <scsi/scsi_host.h>
34#include <scsi/scsi.h>
35#include <scsi/iscsi_proto.h>
36#include <scsi/scsi_transport.h>
37#include <scsi/scsi_transport_iscsi.h>
38#include <scsi/libiscsi.h>
39
40struct iscsi_session *
41class_to_transport_session(struct iscsi_cls_session *cls_session)
42{
43 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
44 return iscsi_hostdata(shost->hostdata);
45}
46EXPORT_SYMBOL_GPL(class_to_transport_session);
47
48#define INVALID_SN_DELTA 0xffff
49
50int
51iscsi_check_assign_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr)
52{
53 uint32_t max_cmdsn = be32_to_cpu(hdr->max_cmdsn);
54 uint32_t exp_cmdsn = be32_to_cpu(hdr->exp_cmdsn);
55
56 if (max_cmdsn < exp_cmdsn -1 &&
57 max_cmdsn > exp_cmdsn - INVALID_SN_DELTA)
58 return ISCSI_ERR_MAX_CMDSN;
59 if (max_cmdsn > session->max_cmdsn ||
60 max_cmdsn < session->max_cmdsn - INVALID_SN_DELTA)
61 session->max_cmdsn = max_cmdsn;
62 if (exp_cmdsn > session->exp_cmdsn ||
63 exp_cmdsn < session->exp_cmdsn - INVALID_SN_DELTA)
64 session->exp_cmdsn = exp_cmdsn;
65
66 return 0;
67}
68EXPORT_SYMBOL_GPL(iscsi_check_assign_cmdsn);
69
70void iscsi_prep_unsolicit_data_pdu(struct iscsi_cmd_task *ctask,
71 struct iscsi_data *hdr,
72 int transport_data_cnt)
73{
74 struct iscsi_conn *conn = ctask->conn;
75
76 memset(hdr, 0, sizeof(struct iscsi_data));
77 hdr->ttt = cpu_to_be32(ISCSI_RESERVED_TAG);
78 hdr->datasn = cpu_to_be32(ctask->unsol_datasn);
79 ctask->unsol_datasn++;
80 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
81 memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
82
83 hdr->itt = ctask->hdr->itt;
84 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
85
86 hdr->offset = cpu_to_be32(ctask->total_length -
87 transport_data_cnt -
88 ctask->unsol_count);
89
90 if (ctask->unsol_count > conn->max_xmit_dlength) {
91 hton24(hdr->dlength, conn->max_xmit_dlength);
92 ctask->data_count = conn->max_xmit_dlength;
93 hdr->flags = 0;
94 } else {
95 hton24(hdr->dlength, ctask->unsol_count);
96 ctask->data_count = ctask->unsol_count;
97 hdr->flags = ISCSI_FLAG_CMD_FINAL;
98 }
99}
100EXPORT_SYMBOL_GPL(iscsi_prep_unsolicit_data_pdu);
101
102/**
103 * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
104 * @ctask: iscsi cmd task
105 *
106 * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set
107 * fields like dlength or final based on how much data it sends
108 */
109static void iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask)
110{
111 struct iscsi_conn *conn = ctask->conn;
112 struct iscsi_session *session = conn->session;
113 struct iscsi_cmd *hdr = ctask->hdr;
114 struct scsi_cmnd *sc = ctask->sc;
115
116 hdr->opcode = ISCSI_OP_SCSI_CMD;
117 hdr->flags = ISCSI_ATTR_SIMPLE;
118 int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun);
119 hdr->itt = ctask->itt | (conn->id << ISCSI_CID_SHIFT) |
120 (session->age << ISCSI_AGE_SHIFT);
121 hdr->data_length = cpu_to_be32(sc->request_bufflen);
122 hdr->cmdsn = cpu_to_be32(session->cmdsn);
123 session->cmdsn++;
124 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
125 memcpy(hdr->cdb, sc->cmnd, sc->cmd_len);
126 memset(&hdr->cdb[sc->cmd_len], 0, MAX_COMMAND_SIZE - sc->cmd_len);
127
128 if (sc->sc_data_direction == DMA_TO_DEVICE) {
129 hdr->flags |= ISCSI_FLAG_CMD_WRITE;
130 /*
131 * Write counters:
132 *
133 * imm_count bytes to be sent right after
134 * SCSI PDU Header
135 *
136 * unsol_count bytes(as Data-Out) to be sent
137 * without R2T ack right after
138 * immediate data
139 *
140 * r2t_data_count bytes to be sent via R2T ack's
141 *
142 * pad_count bytes to be sent as zero-padding
143 */
144 ctask->imm_count = 0;
145 ctask->unsol_count = 0;
146 ctask->unsol_datasn = 0;
147
148 if (session->imm_data_en) {
149 if (ctask->total_length >= session->first_burst)
150 ctask->imm_count = min(session->first_burst,
151 conn->max_xmit_dlength);
152 else
153 ctask->imm_count = min(ctask->total_length,
154 conn->max_xmit_dlength);
155 hton24(ctask->hdr->dlength, ctask->imm_count);
156 } else
157 zero_data(ctask->hdr->dlength);
158
159 if (!session->initial_r2t_en)
160 ctask->unsol_count = min(session->first_burst,
161 ctask->total_length) - ctask->imm_count;
162 if (!ctask->unsol_count)
163 /* No unsolicit Data-Out's */
164 ctask->hdr->flags |= ISCSI_FLAG_CMD_FINAL;
165 } else {
166 ctask->datasn = 0;
167 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
168 zero_data(hdr->dlength);
169
170 if (sc->sc_data_direction == DMA_FROM_DEVICE)
171 hdr->flags |= ISCSI_FLAG_CMD_READ;
172 }
173
174 conn->scsicmd_pdus_cnt++;
175}
176EXPORT_SYMBOL_GPL(iscsi_prep_scsi_cmd_pdu);
177
178/**
179 * iscsi_complete_command - return command back to scsi-ml
180 * @session: iscsi session
181 * @ctask: iscsi cmd task
182 *
183 * Must be called with session lock.
184 * This function returns the scsi command to scsi-ml and returns
185 * the cmd task to the pool of available cmd tasks.
186 */
187static void iscsi_complete_command(struct iscsi_session *session,
188 struct iscsi_cmd_task *ctask)
189{
190 struct scsi_cmnd *sc = ctask->sc;
191
b6c395ed 192 ctask->state = ISCSI_TASK_COMPLETED;
7996a778
MC		 193 ctask->sc = NULL;
194 list_del_init(&ctask->running);
195 __kfifo_put(session->cmdpool.queue, (void*)&ctask, sizeof(void*));
196 sc->scsi_done(sc);
197}
198
199/**
200 * iscsi_cmd_rsp - SCSI Command Response processing
201 * @conn: iscsi connection
202 * @hdr: iscsi header
203 * @ctask: scsi command task
204 * @data: cmd data buffer
205 * @datalen: len of buffer
206 *
207 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and
208 * then completes the command and task.
209 **/
210static int iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
211 struct iscsi_cmd_task *ctask, char *data,
212 int datalen)
213{
214 int rc;
215 struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)hdr;
216 struct iscsi_session *session = conn->session;
217 struct scsi_cmnd *sc = ctask->sc;
218
219 rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr);
220 if (rc) {
221 sc->result = DID_ERROR << 16;
222 goto out;
223 }
224
225 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
226
227 sc->result = (DID_OK << 16) | rhdr->cmd_status;
228
229 if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) {
230 sc->result = DID_ERROR << 16;
231 goto out;
232 }
233
234 if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) {
235 int senselen;
236
237 if (datalen < 2) {
238invalid_datalen:
be2df72e
OG		 239 printk(KERN_ERR "iscsi: Got CHECK_CONDITION but "
240 "invalid data buffer size of %d\n", datalen);
7996a778
MC		 241 sc->result = DID_BAD_TARGET << 16;
242 goto out;
243 }
244
245 senselen = (data[0] << 8) | data[1];
246 if (datalen < senselen)
247 goto invalid_datalen;
248
249 memcpy(sc->sense_buffer, data + 2,
250 min(senselen, SCSI_SENSE_BUFFERSIZE));
251 debug_scsi("copied %d bytes of sense\n",
252 min(senselen, SCSI_SENSE_BUFFERSIZE));
253 }
254
255 if (sc->sc_data_direction == DMA_TO_DEVICE)
256 goto out;
257
258 if (rhdr->flags & ISCSI_FLAG_CMD_UNDERFLOW) {
259 int res_count = be32_to_cpu(rhdr->residual_count);
260
261 if (res_count > 0 && res_count <= sc->request_bufflen)
262 sc->resid = res_count;
263 else
264 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
265 } else if (rhdr->flags & ISCSI_FLAG_CMD_BIDI_UNDERFLOW)
266 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
267 else if (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW)
268 sc->resid = be32_to_cpu(rhdr->residual_count);
269
270out:
271 debug_scsi("done [sc %lx res %d itt 0x%x]\n",
272 (long)sc, sc->result, ctask->itt);
273 conn->scsirsp_pdus_cnt++;
274
275 iscsi_complete_command(conn->session, ctask);
276 return rc;
277}
278
7ea8b828
MC		 279static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
280{
281 struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr;
282
283 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
284 conn->tmfrsp_pdus_cnt++;
285
286 if (conn->tmabort_state != TMABORT_INITIAL)
287 return;
288
289 if (tmf->response == ISCSI_TMF_RSP_COMPLETE)
290 conn->tmabort_state = TMABORT_SUCCESS;
291 else if (tmf->response == ISCSI_TMF_RSP_NO_TASK)
292 conn->tmabort_state = TMABORT_NOT_FOUND;
293 else
294 conn->tmabort_state = TMABORT_FAILED;
295 wake_up(&conn->ehwait);
296}
297
7996a778
MC		 298/**
299 * __iscsi_complete_pdu - complete pdu
300 * @conn: iscsi conn
301 * @hdr: iscsi header
302 * @data: data buffer
303 * @datalen: len of data buffer
304 *
305 * Completes pdu processing by freeing any resources allocated at
306 * queuecommand or send generic. session lock must be held and verify
307 * itt must have been called.
308 */
309int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
310 char *data, int datalen)
311{
312 struct iscsi_session *session = conn->session;
313 int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0;
314 struct iscsi_cmd_task *ctask;
315 struct iscsi_mgmt_task *mtask;
316 uint32_t itt;
317
318 if (hdr->itt != cpu_to_be32(ISCSI_RESERVED_TAG))
319 itt = hdr->itt & ISCSI_ITT_MASK;
320 else
321 itt = hdr->itt;
322
323 if (itt < session->cmds_max) {
324 ctask = session->cmds[itt];
325
326 debug_scsi("cmdrsp [op 0x%x cid %d itt 0x%x len %d]\n",
327 opcode, conn->id, ctask->itt, datalen);
328
329 switch(opcode) {
330 case ISCSI_OP_SCSI_CMD_RSP:
331 BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
332 rc = iscsi_scsi_cmd_rsp(conn, hdr, ctask, data,
333 datalen);
334 break;
335 case ISCSI_OP_SCSI_DATA_IN:
336 BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
337 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
338 conn->scsirsp_pdus_cnt++;
339 iscsi_complete_command(session, ctask);
340 }
341 break;
342 case ISCSI_OP_R2T:
343 /* LLD handles this for now */
344 break;
345 default:
346 rc = ISCSI_ERR_BAD_OPCODE;
347 break;
348 }
349 } else if (itt >= ISCSI_MGMT_ITT_OFFSET &&
350 itt < ISCSI_MGMT_ITT_OFFSET + session->mgmtpool_max) {
351 mtask = session->mgmt_cmds[itt - ISCSI_MGMT_ITT_OFFSET];
352
353 debug_scsi("immrsp [op 0x%x cid %d itt 0x%x len %d]\n",
354 opcode, conn->id, mtask->itt, datalen);
355
8d2860b3
MC		 356 rc = iscsi_check_assign_cmdsn(session,
357 (struct iscsi_nopin*)hdr);
358 if (rc)
359 goto done;
360
7996a778 361 switch(opcode) {
8d2860b3 362 case ISCSI_OP_LOGOUT_RSP:
c8dc1e52
MC		 363 if (datalen) {
364 rc = ISCSI_ERR_PROTO;
365 break;
366 }
8d2860b3
MC		 367 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
368 /* fall through */
7996a778
MC		 369 case ISCSI_OP_LOGIN_RSP:
370 case ISCSI_OP_TEXT_RSP:
8d2860b3
MC		 371 /*
372 * login related PDU's exp_statsn is handled in
373 * userspace
374 */
7996a778
MC		 375 rc = iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen);
376 list_del(&mtask->running);
377 if (conn->login_mtask != mtask)
378 __kfifo_put(session->mgmtpool.queue,
379 (void*)&mtask, sizeof(void*));
380 break;
381 case ISCSI_OP_SCSI_TMFUNC_RSP:
7996a778
MC		 382 if (datalen) {
383 rc = ISCSI_ERR_PROTO;
384 break;
385 }
8d2860b3 386
7ea8b828 387 iscsi_tmf_rsp(conn, hdr);
7996a778
MC		 388 break;
389 case ISCSI_OP_NOOP_IN:
c8dc1e52 390 if (hdr->ttt != ISCSI_RESERVED_TAG || datalen) {
7996a778
MC		 391 rc = ISCSI_ERR_PROTO;
392 break;
393 }
7996a778
MC		 394 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
395
396 rc = iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen);
397 list_del(&mtask->running);
398 if (conn->login_mtask != mtask)
399 __kfifo_put(session->mgmtpool.queue,
400 (void*)&mtask, sizeof(void*));
401 break;
402 default:
403 rc = ISCSI_ERR_BAD_OPCODE;
404 break;
405 }
406 } else if (itt == ISCSI_RESERVED_TAG) {
407 switch(opcode) {
408 case ISCSI_OP_NOOP_IN:
409 if (!datalen) {
410 rc = iscsi_check_assign_cmdsn(session,
411 (struct iscsi_nopin*)hdr);
412 if (!rc && hdr->ttt != ISCSI_RESERVED_TAG)
413 rc = iscsi_recv_pdu(conn->cls_conn,
414 hdr, NULL, 0);
415 } else
416 rc = ISCSI_ERR_PROTO;
417 break;
418 case ISCSI_OP_REJECT:
419 /* we need sth like iscsi_reject_rsp()*/
420 case ISCSI_OP_ASYNC_EVENT:
8d2860b3 421 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
7996a778
MC		 422 /* we need sth like iscsi_async_event_rsp() */
423 rc = ISCSI_ERR_BAD_OPCODE;
424 break;
425 default:
426 rc = ISCSI_ERR_BAD_OPCODE;
427 break;
428 }
429 } else
430 rc = ISCSI_ERR_BAD_ITT;
431
8d2860b3 432done:
7996a778
MC		 433 return rc;
434}
435EXPORT_SYMBOL_GPL(__iscsi_complete_pdu);
436
437int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
438 char *data, int datalen)
439{
440 int rc;
441
442 spin_lock(&conn->session->lock);
443 rc = __iscsi_complete_pdu(conn, hdr, data, datalen);
444 spin_unlock(&conn->session->lock);
445 return rc;
446}
447EXPORT_SYMBOL_GPL(iscsi_complete_pdu);
448
449/* verify itt (itt encoding: age+cid+itt) */
450int iscsi_verify_itt(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
451 uint32_t *ret_itt)
452{
453 struct iscsi_session *session = conn->session;
454 struct iscsi_cmd_task *ctask;
455 uint32_t itt;
456
457 if (hdr->itt != cpu_to_be32(ISCSI_RESERVED_TAG)) {
458 if ((hdr->itt & ISCSI_AGE_MASK) !=
459 (session->age << ISCSI_AGE_SHIFT)) {
be2df72e 460 printk(KERN_ERR "iscsi: received itt %x expected "
7996a778
MC		 461 "session age (%x)\n", hdr->itt,
462 session->age & ISCSI_AGE_MASK);
463 return ISCSI_ERR_BAD_ITT;
464 }
465
466 if ((hdr->itt & ISCSI_CID_MASK) !=
467 (conn->id << ISCSI_CID_SHIFT)) {
be2df72e 468 printk(KERN_ERR "iscsi: received itt %x, expected "
7996a778
MC		 469 "CID (%x)\n", hdr->itt, conn->id);
470 return ISCSI_ERR_BAD_ITT;
471 }
472 itt = hdr->itt & ISCSI_ITT_MASK;
473 } else
474 itt = hdr->itt;
475
476 if (itt < session->cmds_max) {
477 ctask = session->cmds[itt];
478
479 if (!ctask->sc) {
be2df72e 480 printk(KERN_INFO "iscsi: dropping ctask with "
7996a778
MC		 481 "itt 0x%x\n", ctask->itt);
482 /* force drop */
483 return ISCSI_ERR_NO_SCSI_CMD;
484 }
485
486 if (ctask->sc->SCp.phase != session->age) {
be2df72e 487 printk(KERN_ERR "iscsi: ctask's session age %d, "
7996a778
MC		 488 "expected %d\n", ctask->sc->SCp.phase,
489 session->age);
490 return ISCSI_ERR_SESSION_FAILED;
491 }
492 }
493
494 *ret_itt = itt;
495 return 0;
496}
497EXPORT_SYMBOL_GPL(iscsi_verify_itt);
498
499void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
500{
501 struct iscsi_session *session = conn->session;
502 unsigned long flags;
503
504 spin_lock_irqsave(&session->lock, flags);
656cffc9
MC		 505 if (session->state == ISCSI_STATE_FAILED) {
506 spin_unlock_irqrestore(&session->lock, flags);
507 return;
508 }
509
67a61114 510 if (conn->stop_stage == 0)
7996a778
MC		 511 session->state = ISCSI_STATE_FAILED;
512 spin_unlock_irqrestore(&session->lock, flags);
513 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
514 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
515 iscsi_conn_error(conn->cls_conn, err);
516}
517EXPORT_SYMBOL_GPL(iscsi_conn_failure);
518
519/**
520 * iscsi_data_xmit - xmit any command into the scheduled connection
521 * @conn: iscsi connection
522 *
523 * Notes:
524 * The function can return -EAGAIN in which case the caller must
525 * re-schedule it again later or recover. '0' return code means
526 * successful xmit.
527 **/
528static int iscsi_data_xmit(struct iscsi_conn *conn)
529{
530 struct iscsi_transport *tt;
3219e529 531 int rc = 0;
7996a778
MC		 532
533 if (unlikely(conn->suspend_tx)) {
534 debug_scsi("conn %d Tx suspended!\n", conn->id);
3219e529 535 return -ENODATA;
7996a778
MC		 536 }
537 tt = conn->session->tt;
538
539 /*
540 * Transmit in the following order:
541 *
542 * 1) un-finished xmit (ctask or mtask)
543 * 2) immediate control PDUs
544 * 3) write data
545 * 4) SCSI commands
546 * 5) non-immediate control PDUs
547 *
548 * No need to lock around __kfifo_get as long as
549 * there's one producer and one consumer.
550 */
551
552 BUG_ON(conn->ctask && conn->mtask);
553
554 if (conn->ctask) {
3219e529
MC		 555 rc = tt->xmit_cmd_task(conn, conn->ctask);
556 if (rc)
7996a778
MC		 557 goto again;
558 /* done with this in-progress ctask */
559 conn->ctask = NULL;
560 }
561 if (conn->mtask) {
3219e529
MC		 562 rc = tt->xmit_mgmt_task(conn, conn->mtask);
563 if (rc)
7996a778
MC		 564 goto again;
565 /* done with this in-progress mtask */
566 conn->mtask = NULL;
567 }
568
569 /* process immediate first */
570 if (unlikely(__kfifo_len(conn->immqueue))) {
571 while (__kfifo_get(conn->immqueue, (void*)&conn->mtask,
572 sizeof(void*))) {
994442e8 573 spin_lock_bh(&conn->session->lock);
7996a778
MC		 574 list_add_tail(&conn->mtask->running,
575 &conn->mgmt_run_list);
994442e8 576 spin_unlock_bh(&conn->session->lock);
3219e529
MC		 577 rc = tt->xmit_mgmt_task(conn, conn->mtask);
578 if (rc)
7996a778
MC		 579 goto again;
580 }
581 /* done with this mtask */
582 conn->mtask = NULL;
583 }
584
585 /* process command queue */
b6c395ed
MC		 586 spin_lock_bh(&conn->session->lock);
587 while (!list_empty(&conn->xmitqueue)) {
7996a778
MC		 588 /*
589 * iscsi tcp may readd the task to the xmitqueue to send
590 * write data
591 */
b6c395ed
MC		 592 conn->ctask = list_entry(conn->xmitqueue.next,
593 struct iscsi_cmd_task, running);
594 conn->ctask->state = ISCSI_TASK_RUNNING;
595 list_move_tail(conn->xmitqueue.next, &conn->run_list);
994442e8 596 spin_unlock_bh(&conn->session->lock);
b6c395ed 597
3219e529
MC		 598 rc = tt->xmit_cmd_task(conn, conn->ctask);
599 if (rc)
7996a778 600 goto again;
b6c395ed 601 spin_lock_bh(&conn->session->lock);
7996a778 602 }
b6c395ed 603 spin_unlock_bh(&conn->session->lock);
7996a778
MC		 604 /* done with this ctask */
605 conn->ctask = NULL;
606
607 /* process the rest control plane PDUs, if any */
608 if (unlikely(__kfifo_len(conn->mgmtqueue))) {
609 while (__kfifo_get(conn->mgmtqueue, (void*)&conn->mtask,
610 sizeof(void*))) {
994442e8 611 spin_lock_bh(&conn->session->lock);
7996a778
MC		 612 list_add_tail(&conn->mtask->running,
613 &conn->mgmt_run_list);
994442e8 614 spin_unlock_bh(&conn->session->lock);
3219e529
MC		 615 rc = tt->xmit_mgmt_task(conn, conn->mtask);
616 if (rc)
7996a778
MC		 617 goto again;
618 }
619 /* done with this mtask */
620 conn->mtask = NULL;
621 }
622
3219e529 623 return -ENODATA;
7996a778
MC		 624
625again:
626 if (unlikely(conn->suspend_tx))
3219e529 627 return -ENODATA;
7996a778 628
3219e529 629 return rc;
7996a778
MC		 630}
631
632static void iscsi_xmitworker(void *data)
633{
634 struct iscsi_conn *conn = data;
3219e529 635 int rc;
7996a778
MC		 636 /*
637 * serialize Xmit worker on a per-connection basis.
638 */
639 mutex_lock(&conn->xmitmutex);
3219e529
MC		 640 do {
641 rc = iscsi_data_xmit(conn);
642 } while (rc >= 0 || rc == -EAGAIN);
7996a778
MC		 643 mutex_unlock(&conn->xmitmutex);
644}
645
646enum {
647 FAILURE_BAD_HOST = 1,
648 FAILURE_SESSION_FAILED,
649 FAILURE_SESSION_FREED,
650 FAILURE_WINDOW_CLOSED,
651 FAILURE_SESSION_TERMINATE,
656cffc9 652 FAILURE_SESSION_IN_RECOVERY,
7996a778
MC		 653 FAILURE_SESSION_RECOVERY_TIMEOUT,
654};
655
656int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
657{
658 struct Scsi_Host *host;
659 int reason = 0;
660 struct iscsi_session *session;
661 struct iscsi_conn *conn;
662 struct iscsi_cmd_task *ctask = NULL;
663
664 sc->scsi_done = done;
665 sc->result = 0;
666
667 host = sc->device->host;
668 session = iscsi_hostdata(host->hostdata);
669
670 spin_lock(&session->lock);
671
656cffc9
MC		 672 /*
673 * ISCSI_STATE_FAILED is a temp. state. The recovery
674 * code will decide what is best to do with command queued
675 * during this time
676 */
677 if (session->state != ISCSI_STATE_LOGGED_IN &&
678 session->state != ISCSI_STATE_FAILED) {
679 /*
680 * to handle the race between when we set the recovery state
681 * and block the session we requeue here (commands could
682 * be entering our queuecommand while a block is starting
683 * up because the block code is not locked)
684 */
685 if (session->state == ISCSI_STATE_IN_RECOVERY) {
686 reason = FAILURE_SESSION_IN_RECOVERY;
67a61114 687 goto reject;
7996a778 688 }
656cffc9
MC		 689
690 if (session->state == ISCSI_STATE_RECOVERY_FAILED)
691 reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
692 else if (session->state == ISCSI_STATE_TERMINATE)
693 reason = FAILURE_SESSION_TERMINATE;
694 else
695 reason = FAILURE_SESSION_FREED;
7996a778
MC		 696 goto fault;
697 }
698
699 /*
700 * Check for iSCSI window and take care of CmdSN wrap-around
701 */
702 if ((int)(session->max_cmdsn - session->cmdsn) < 0) {
703 reason = FAILURE_WINDOW_CLOSED;
704 goto reject;
705 }
706
707 conn = session->leadconn;
708
709 __kfifo_get(session->cmdpool.queue, (void*)&ctask, sizeof(void*));
710 sc->SCp.phase = session->age;
711 sc->SCp.ptr = (char *)ctask;
712
b6c395ed 713 ctask->state = ISCSI_TASK_PENDING;
7996a778
MC		 714 ctask->mtask = NULL;
715 ctask->conn = conn;
716 ctask->sc = sc;
717 INIT_LIST_HEAD(&ctask->running);
718 ctask->total_length = sc->request_bufflen;
719 iscsi_prep_scsi_cmd_pdu(ctask);
720
721 session->tt->init_cmd_task(ctask);
722
b6c395ed 723 list_add_tail(&ctask->running, &conn->xmitqueue);
7996a778
MC		 724 debug_scsi(
725 "ctask enq [%s cid %d sc %lx itt 0x%x len %d cmdsn %d win %d]\n",
726 sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read",
727 conn->id, (long)sc, ctask->itt, sc->request_bufflen,
728 session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1);
729 spin_unlock(&session->lock);
730
731 scsi_queue_work(host, &conn->xmitwork);
732 return 0;
733
734reject:
735 spin_unlock(&session->lock);
736 debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason);
737 return SCSI_MLQUEUE_HOST_BUSY;
738
739fault:
740 spin_unlock(&session->lock);
be2df72e 741 printk(KERN_ERR "iscsi: cmd 0x%x is not queued (%d)\n",
7996a778
MC		 742 sc->cmnd[0], reason);
743 sc->result = (DID_NO_CONNECT << 16);
744 sc->resid = sc->request_bufflen;
745 sc->scsi_done(sc);
746 return 0;
747}
748EXPORT_SYMBOL_GPL(iscsi_queuecommand);
749
750int iscsi_change_queue_depth(struct scsi_device *sdev, int depth)
751{
752 if (depth > ISCSI_MAX_CMD_PER_LUN)
753 depth = ISCSI_MAX_CMD_PER_LUN;
754 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
755 return sdev->queue_depth;
756}
757EXPORT_SYMBOL_GPL(iscsi_change_queue_depth);
758
759static int
760iscsi_conn_send_generic(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
761 char *data, uint32_t data_size)
762{
763 struct iscsi_session *session = conn->session;
764 struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
765 struct iscsi_mgmt_task *mtask;
766
767 spin_lock_bh(&session->lock);
768 if (session->state == ISCSI_STATE_TERMINATE) {
769 spin_unlock_bh(&session->lock);
770 return -EPERM;
771 }
772 if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) ||
773 hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
774 /*
775 * Login and Text are sent serially, in
776 * request-followed-by-response sequence.
777 * Same mtask can be used. Same ITT must be used.
778 * Note that login_mtask is preallocated at conn_create().
779 */
780 mtask = conn->login_mtask;
781 else {
656cffc9
MC		 782 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
783 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
7996a778 784
8d2860b3 785 nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
7996a778
MC		 786 if (!__kfifo_get(session->mgmtpool.queue,
787 (void*)&mtask, sizeof(void*))) {
788 spin_unlock_bh(&session->lock);
789 return -ENOSPC;
790 }
791 }
792
793 /*
8d2860b3 794 * pre-format CmdSN for outgoing PDU.
7996a778
MC		 795 */
796 if (hdr->itt != cpu_to_be32(ISCSI_RESERVED_TAG)) {
797 hdr->itt = mtask->itt | (conn->id << ISCSI_CID_SHIFT) |
798 (session->age << ISCSI_AGE_SHIFT);
799 nop->cmdsn = cpu_to_be32(session->cmdsn);
800 if (conn->c_stage == ISCSI_CONN_STARTED &&
801 !(hdr->opcode & ISCSI_OP_IMMEDIATE))
802 session->cmdsn++;
803 } else
804 /* do not advance CmdSN */
805 nop->cmdsn = cpu_to_be32(session->cmdsn);
806
7996a778
MC		 807 if (data_size) {
808 memcpy(mtask->data, data, data_size);
809 mtask->data_count = data_size;
810 } else
811 mtask->data_count = 0;
812
813 INIT_LIST_HEAD(&mtask->running);
814 memcpy(mtask->hdr, hdr, sizeof(struct iscsi_hdr));
815 if (session->tt->init_mgmt_task)
816 session->tt->init_mgmt_task(conn, mtask, data, data_size);
817 spin_unlock_bh(&session->lock);
818
819 debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n",
820 hdr->opcode, hdr->itt, data_size);
821
822 /*
823 * since send_pdu() could be called at least from two contexts,
824 * we need to serialize __kfifo_put, so we don't have to take
825 * additional lock on fast data-path
826 */
827 if (hdr->opcode & ISCSI_OP_IMMEDIATE)
828 __kfifo_put(conn->immqueue, (void*)&mtask, sizeof(void*));
829 else
830 __kfifo_put(conn->mgmtqueue, (void*)&mtask, sizeof(void*));
831
832 scsi_queue_work(session->host, &conn->xmitwork);
833 return 0;
834}
835
836int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr,
837 char *data, uint32_t data_size)
838{
839 struct iscsi_conn *conn = cls_conn->dd_data;
840 int rc;
841
842 mutex_lock(&conn->xmitmutex);
843 rc = iscsi_conn_send_generic(conn, hdr, data, data_size);
844 mutex_unlock(&conn->xmitmutex);
845
846 return rc;
847}
848EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu);
849
850void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
851{
852 struct iscsi_session *session = class_to_transport_session(cls_session);
853 struct iscsi_conn *conn = session->leadconn;
854
855 spin_lock_bh(&session->lock);
856 if (session->state != ISCSI_STATE_LOGGED_IN) {
656cffc9 857 session->state = ISCSI_STATE_RECOVERY_FAILED;
7996a778
MC		 858 if (conn)
859 wake_up(&conn->ehwait);
860 }
861 spin_unlock_bh(&session->lock);
862}
863EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
864
865int iscsi_eh_host_reset(struct scsi_cmnd *sc)
866{
867 struct Scsi_Host *host = sc->device->host;
868 struct iscsi_session *session = iscsi_hostdata(host->hostdata);
869 struct iscsi_conn *conn = session->leadconn;
870 int fail_session = 0;
871
872 spin_lock_bh(&session->lock);
873 if (session->state == ISCSI_STATE_TERMINATE) {
874failed:
875 debug_scsi("failing host reset: session terminated "
876 "[CID %d age %d]", conn->id, session->age);
877 spin_unlock_bh(&session->lock);
878 return FAILED;
879 }
880
881 if (sc->SCp.phase == session->age) {
882 debug_scsi("failing connection CID %d due to SCSI host reset",
883 conn->id);
884 fail_session = 1;
885 }
886 spin_unlock_bh(&session->lock);
887
888 /*
889 * we drop the lock here but the leadconn cannot be destoyed while
890 * we are in the scsi eh
891 */
656cffc9 892 if (fail_session)
7996a778 893 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
7996a778
MC		 894
895 debug_scsi("iscsi_eh_host_reset wait for relogin\n");
896 wait_event_interruptible(conn->ehwait,
897 session->state == ISCSI_STATE_TERMINATE ||
898 session->state == ISCSI_STATE_LOGGED_IN ||
656cffc9 899 session->state == ISCSI_STATE_RECOVERY_FAILED);
7996a778
MC		 900 if (signal_pending(current))
901 flush_signals(current);
902
903 spin_lock_bh(&session->lock);
904 if (session->state == ISCSI_STATE_LOGGED_IN)
be2df72e 905 printk(KERN_INFO "iscsi: host reset succeeded\n");
7996a778
MC		 906 else
907 goto failed;
908 spin_unlock_bh(&session->lock);
909
910 return SUCCESS;
911}
912EXPORT_SYMBOL_GPL(iscsi_eh_host_reset);
913
914static void iscsi_tmabort_timedout(unsigned long data)
915{
916 struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)data;
917 struct iscsi_conn *conn = ctask->conn;
918 struct iscsi_session *session = conn->session;
919
920 spin_lock(&session->lock);
921 if (conn->tmabort_state == TMABORT_INITIAL) {
922 conn->tmabort_state = TMABORT_TIMEDOUT;
923 debug_scsi("tmabort timedout [sc %p itt 0x%x]\n",
924 ctask->sc, ctask->itt);
925 /* unblock eh_abort() */
926 wake_up(&conn->ehwait);
927 }
928 spin_unlock(&session->lock);
929}
930
931/* must be called with the mutex lock */
932static int iscsi_exec_abort_task(struct scsi_cmnd *sc,
933 struct iscsi_cmd_task *ctask)
934{
935 struct iscsi_conn *conn = ctask->conn;
936 struct iscsi_session *session = conn->session;
937 struct iscsi_tm *hdr = &conn->tmhdr;
938 int rc;
939
940 /*
941 * ctask timed out but session is OK requests must be serialized.
942 */
943 memset(hdr, 0, sizeof(struct iscsi_tm));
944 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
945 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK;
946 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
947 memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
948 hdr->rtt = ctask->hdr->itt;
949 hdr->refcmdsn = ctask->hdr->cmdsn;
950
951 rc = iscsi_conn_send_generic(conn, (struct iscsi_hdr *)hdr,
952 NULL, 0);
953 if (rc) {
954 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
955 debug_scsi("abort sent failure [itt 0x%x] %d", ctask->itt, rc);
956 return rc;
957 }
958
959 debug_scsi("abort sent [itt 0x%x]\n", ctask->itt);
960
961 spin_lock_bh(&session->lock);
962 ctask->mtask = (struct iscsi_mgmt_task *)
963 session->mgmt_cmds[(hdr->itt & ISCSI_ITT_MASK) -
964 ISCSI_MGMT_ITT_OFFSET];
965
966 if (conn->tmabort_state == TMABORT_INITIAL) {
967 conn->tmfcmd_pdus_cnt++;
968 conn->tmabort_timer.expires = 10*HZ + jiffies;
969 conn->tmabort_timer.function = iscsi_tmabort_timedout;
970 conn->tmabort_timer.data = (unsigned long)ctask;
971 add_timer(&conn->tmabort_timer);
972 debug_scsi("abort set timeout [itt 0x%x]", ctask->itt);
973 }
974 spin_unlock_bh(&session->lock);
975 mutex_unlock(&conn->xmitmutex);
976
977 /*
978 * block eh thread until:
979 *
980 * 1) abort response
981 * 2) abort timeout
982 * 3) session is terminated or restarted or userspace has
983 * given up on recovery
984 */
985 wait_event_interruptible(conn->ehwait,
986 sc->SCp.phase != session->age ||
987 session->state != ISCSI_STATE_LOGGED_IN ||
656cffc9 988 conn->tmabort_state != TMABORT_INITIAL);
7996a778
MC		 989 if (signal_pending(current))
990 flush_signals(current);
991 del_timer_sync(&conn->tmabort_timer);
992
993 mutex_lock(&conn->xmitmutex);
994 return 0;
995}
996
997/*
998 * xmit mutex and session lock must be held
999 */
b6c395ed
MC		 1000static struct iscsi_mgmt_task *
1001iscsi_remove_mgmt_task(struct kfifo *fifo, uint32_t itt)
1002{
1003 int i, nr_tasks = __kfifo_len(fifo) / sizeof(void*);
1004 struct iscsi_mgmt_task *task;
1005
1006 debug_scsi("searching %d tasks\n", nr_tasks);
1007
1008 for (i = 0; i < nr_tasks; i++) {
1009 __kfifo_get(fifo, (void*)&task, sizeof(void*));
1010 debug_scsi("check task %u\n", task->itt);
1011
1012 if (task->itt == itt) {
1013 debug_scsi("matched task\n");
1014 return task;
1015 }
7996a778 1016
b6c395ed
MC		 1017 __kfifo_put(fifo, (void*)&task, sizeof(void*));
1018 }
1019 return NULL;
1020}
7996a778
MC		 1021
1022static int iscsi_ctask_mtask_cleanup(struct iscsi_cmd_task *ctask)
1023{
1024 struct iscsi_conn *conn = ctask->conn;
1025 struct iscsi_session *session = conn->session;
1026
1027 if (!ctask->mtask)
1028 return -EINVAL;
1029
1030 if (!iscsi_remove_mgmt_task(conn->immqueue, ctask->mtask->itt))
1031 list_del(&ctask->mtask->running);
1032 __kfifo_put(session->mgmtpool.queue, (void*)&ctask->mtask,
1033 sizeof(void*));
1034 ctask->mtask = NULL;
1035 return 0;
1036}
1037
1038/*
1039 * session lock and xmitmutex must be held
1040 */
1041static void fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
1042 int err)
1043{
1044 struct scsi_cmnd *sc;
1045
7996a778
MC		 1046 sc = ctask->sc;
1047 if (!sc)
1048 return;
7ea8b828
MC		 1049
1050 conn->session->tt->cleanup_cmd_task(conn, ctask);
1051 iscsi_ctask_mtask_cleanup(ctask);
1052
7996a778
MC		 1053 sc->result = err;
1054 sc->resid = sc->request_bufflen;
1055 iscsi_complete_command(conn->session, ctask);
1056}
1057
1058int iscsi_eh_abort(struct scsi_cmnd *sc)
1059{
1060 struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)sc->SCp.ptr;
1061 struct iscsi_conn *conn = ctask->conn;
1062 struct iscsi_session *session = conn->session;
7996a778
MC		 1063 int rc;
1064
1065 conn->eh_abort_cnt++;
1066 debug_scsi("aborting [sc %p itt 0x%x]\n", sc, ctask->itt);
1067
1068 mutex_lock(&conn->xmitmutex);
1069 spin_lock_bh(&session->lock);
1070
1071 /*
1072 * If we are not logged in or we have started a new session
1073 * then let the host reset code handle this
1074 */
1075 if (session->state != ISCSI_STATE_LOGGED_IN ||
1076 sc->SCp.phase != session->age)
1077 goto failed;
1078
1079 /* ctask completed before time out */
7ea8b828
MC		 1080 if (!ctask->sc) {
1081 spin_unlock_bh(&session->lock);
1082 debug_scsi("sc completed while abort in progress\n");
1083 goto success_rel_mutex;
1084 }
7996a778
MC		 1085
1086 /* what should we do here ? */
1087 if (conn->ctask == ctask) {
be2df72e
OG		 1088 printk(KERN_INFO "iscsi: sc %p itt 0x%x partially sent. "
1089 "Failing abort\n", sc, ctask->itt);
7996a778
MC		 1090 goto failed;
1091 }
1092
b6c395ed 1093 if (ctask->state == ISCSI_TASK_PENDING)
7ea8b828 1094 goto success_cleanup;
7996a778
MC		 1095
1096 conn->tmabort_state = TMABORT_INITIAL;
1097
1098 spin_unlock_bh(&session->lock);
1099 rc = iscsi_exec_abort_task(sc, ctask);
1100 spin_lock_bh(&session->lock);
1101
7996a778
MC		 1102 if (rc || sc->SCp.phase != session->age ||
1103 session->state != ISCSI_STATE_LOGGED_IN)
1104 goto failed;
7ea8b828 1105 iscsi_ctask_mtask_cleanup(ctask);
7996a778 1106
7ea8b828
MC		 1107 switch (conn->tmabort_state) {
1108 case TMABORT_SUCCESS:
1109 goto success_cleanup;
1110 case TMABORT_NOT_FOUND:
1111 if (!ctask->sc) {
1112 /* ctask completed before tmf abort response */
1113 spin_unlock_bh(&session->lock);
1114 debug_scsi("sc completed while abort in progress\n");
1115 goto success_rel_mutex;
1116 }
1117 /* fall through */
1118 default:
1119 /* timedout or failed */
7996a778
MC		 1120 spin_unlock_bh(&session->lock);
1121 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1122 spin_lock_bh(&session->lock);
1123 goto failed;
1124 }
1125
7ea8b828 1126success_cleanup:
7996a778
MC		 1127 debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
1128 spin_unlock_bh(&session->lock);
1129
1130 /*
1131 * clean up task if aborted. we have the xmitmutex so grab
1132 * the recv lock as a writer
1133 */
1134 write_lock_bh(conn->recv_lock);
1135 spin_lock(&session->lock);
1136 fail_command(conn, ctask, DID_ABORT << 16);
1137 spin_unlock(&session->lock);
1138 write_unlock_bh(conn->recv_lock);
1139
7ea8b828 1140success_rel_mutex:
7996a778
MC		 1141 mutex_unlock(&conn->xmitmutex);
1142 return SUCCESS;
1143
1144failed:
1145 spin_unlock_bh(&session->lock);
1146 mutex_unlock(&conn->xmitmutex);
1147
1148 debug_scsi("abort failed [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
1149 return FAILED;
1150}
1151EXPORT_SYMBOL_GPL(iscsi_eh_abort);
1152
1153int
1154iscsi_pool_init(struct iscsi_queue *q, int max, void ***items, int item_size)
1155{
1156 int i;
1157
1158 *items = kmalloc(max * sizeof(void*), GFP_KERNEL);
1159 if (*items == NULL)
1160 return -ENOMEM;
1161
1162 q->max = max;
1163 q->pool = kmalloc(max * sizeof(void*), GFP_KERNEL);
1164 if (q->pool == NULL) {
1165 kfree(*items);
1166 return -ENOMEM;
1167 }
1168
1169 q->queue = kfifo_init((void*)q->pool, max * sizeof(void*),
1170 GFP_KERNEL, NULL);
1171 if (q->queue == ERR_PTR(-ENOMEM)) {
1172 kfree(q->pool);
1173 kfree(*items);
1174 return -ENOMEM;
1175 }
1176
1177 for (i = 0; i < max; i++) {
1178 q->pool[i] = kmalloc(item_size, GFP_KERNEL);
1179 if (q->pool[i] == NULL) {
1180 int j;
1181
1182 for (j = 0; j < i; j++)
1183 kfree(q->pool[j]);
1184
1185 kfifo_free(q->queue);
1186 kfree(q->pool);
1187 kfree(*items);
1188 return -ENOMEM;
1189 }
1190 memset(q->pool[i], 0, item_size);
1191 (*items)[i] = q->pool[i];
1192 __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*));
1193 }
1194 return 0;
1195}
1196EXPORT_SYMBOL_GPL(iscsi_pool_init);
1197
1198void iscsi_pool_free(struct iscsi_queue *q, void **items)
1199{
1200 int i;
1201
1202 for (i = 0; i < q->max; i++)
1203 kfree(items[i]);
1204 kfree(q->pool);
1205 kfree(items);
1206}
1207EXPORT_SYMBOL_GPL(iscsi_pool_free);
1208
1209/*
1210 * iSCSI Session's hostdata organization:
1211 *
1212 * *------------------* <== hostdata_session(host->hostdata)
1213 * | ptr to class sess|
1214 * |------------------| <== iscsi_hostdata(host->hostdata)
1215 * | iscsi_session |
1216 * *------------------*
1217 */
1218
1219#define hostdata_privsize(_sz) (sizeof(unsigned long) + _sz + \
1220 _sz % sizeof(unsigned long))
1221
1222#define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata))
1223
1224/**
1225 * iscsi_session_setup - create iscsi cls session and host and session
1226 * @scsit: scsi transport template
1227 * @iscsit: iscsi transport template
1228 * @initial_cmdsn: initial CmdSN
1229 * @hostno: host no allocated
1230 *
1231 * This can be used by software iscsi_transports that allocate
1232 * a session per scsi host.
1233 **/
1234struct iscsi_cls_session *
1235iscsi_session_setup(struct iscsi_transport *iscsit,
1236 struct scsi_transport_template *scsit,
1237 int cmd_task_size, int mgmt_task_size,
1238 uint32_t initial_cmdsn, uint32_t *hostno)
1239{
1240 struct Scsi_Host *shost;
1241 struct iscsi_session *session;
1242 struct iscsi_cls_session *cls_session;
1243 int cmd_i;
1244
1245 shost = scsi_host_alloc(iscsit->host_template,
1246 hostdata_privsize(sizeof(*session)));
1247 if (!shost)
1248 return NULL;
1249
1250 shost->max_id = 1;
1251 shost->max_channel = 0;
1252 shost->max_lun = iscsit->max_lun;
1253 shost->max_cmd_len = iscsit->max_cmd_len;
1254 shost->transportt = scsit;
1255 shost->transportt->create_work_queue = 1;
1256 *hostno = shost->host_no;
1257
1258 session = iscsi_hostdata(shost->hostdata);
1259 memset(session, 0, sizeof(struct iscsi_session));
1260 session->host = shost;
1261 session->state = ISCSI_STATE_FREE;
1262 session->mgmtpool_max = ISCSI_MGMT_CMDS_MAX;
1263 session->cmds_max = ISCSI_XMIT_CMDS_MAX;
1264 session->cmdsn = initial_cmdsn;
1265 session->exp_cmdsn = initial_cmdsn + 1;
1266 session->max_cmdsn = initial_cmdsn + 1;
1267 session->max_r2t = 1;
1268 session->tt = iscsit;
1269
1270 /* initialize SCSI PDU commands pool */
1271 if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
1272 (void***)&session->cmds,
1273 cmd_task_size + sizeof(struct iscsi_cmd_task)))
1274 goto cmdpool_alloc_fail;
1275
1276 /* pre-format cmds pool with ITT */
1277 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
1278 struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
1279
1280 if (cmd_task_size)
1281 ctask->dd_data = &ctask[1];
1282 ctask->itt = cmd_i;
b6c395ed 1283 INIT_LIST_HEAD(&ctask->running);
7996a778
MC		 1284 }
1285
1286 spin_lock_init(&session->lock);
1287 INIT_LIST_HEAD(&session->connections);
1288
1289 /* initialize immediate command pool */
1290 if (iscsi_pool_init(&session->mgmtpool, session->mgmtpool_max,
1291 (void***)&session->mgmt_cmds,
1292 mgmt_task_size + sizeof(struct iscsi_mgmt_task)))
1293 goto mgmtpool_alloc_fail;
1294
1295
1296 /* pre-format immediate cmds pool with ITT */
1297 for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) {
1298 struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i];
1299
1300 if (mgmt_task_size)
1301 mtask->dd_data = &mtask[1];
1302 mtask->itt = ISCSI_MGMT_ITT_OFFSET + cmd_i;
b6c395ed 1303 INIT_LIST_HEAD(&mtask->running);
7996a778
MC		 1304 }
1305
1306 if (scsi_add_host(shost, NULL))
1307 goto add_host_fail;
1308
f53a88da
MC		 1309 if (!try_module_get(iscsit->owner))
1310 goto cls_session_fail;
1311
6a8a0d36 1312 cls_session = iscsi_create_session(shost, iscsit, 0);
7996a778 1313 if (!cls_session)
f53a88da 1314 goto module_put;
7996a778
MC		 1315 *(unsigned long*)shost->hostdata = (unsigned long)cls_session;
1316
1317 return cls_session;
1318
f53a88da
MC		 1319module_put:
1320 module_put(iscsit->owner);
7996a778
MC		 1321cls_session_fail:
1322 scsi_remove_host(shost);
1323add_host_fail:
7996a778
MC		 1324 iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
1325mgmtpool_alloc_fail:
1326 iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
1327cmdpool_alloc_fail:
1328 scsi_host_put(shost);
1329 return NULL;
1330}
1331EXPORT_SYMBOL_GPL(iscsi_session_setup);
1332
1333/**
1334 * iscsi_session_teardown - destroy session, host, and cls_session
1335 * shost: scsi host
1336 *
1337 * This can be used by software iscsi_transports that allocate
1338 * a session per scsi host.
1339 **/
1340void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
1341{
1342 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
1343 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
63f75cc8 1344 struct module *owner = cls_session->transport->owner;
7996a778
MC		 1345
1346 scsi_remove_host(shost);
1347
7996a778
MC		 1348 iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
1349 iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
1350
1351 iscsi_destroy_session(cls_session);
1352 scsi_host_put(shost);
63f75cc8 1353 module_put(owner);
7996a778
MC		 1354}
1355EXPORT_SYMBOL_GPL(iscsi_session_teardown);
1356
1357/**
1358 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
1359 * @cls_session: iscsi_cls_session
1360 * @conn_idx: cid
1361 **/
1362struct iscsi_cls_conn *
1363iscsi_conn_setup(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
1364{
1365 struct iscsi_session *session = class_to_transport_session(cls_session);
1366 struct iscsi_conn *conn;
1367 struct iscsi_cls_conn *cls_conn;
d36ab6f3 1368 char *data;
7996a778
MC		 1369
1370 cls_conn = iscsi_create_conn(cls_session, conn_idx);
1371 if (!cls_conn)
1372 return NULL;
1373 conn = cls_conn->dd_data;
1374 memset(conn, 0, sizeof(*conn));
1375
1376 conn->session = session;
1377 conn->cls_conn = cls_conn;
1378 conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
1379 conn->id = conn_idx;
1380 conn->exp_statsn = 0;
1381 conn->tmabort_state = TMABORT_INITIAL;
1382 INIT_LIST_HEAD(&conn->run_list);
1383 INIT_LIST_HEAD(&conn->mgmt_run_list);
b6c395ed 1384 INIT_LIST_HEAD(&conn->xmitqueue);
7996a778
MC		 1385
1386 /* initialize general immediate & non-immediate PDU commands queue */
1387 conn->immqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*),
1388 GFP_KERNEL, NULL);
1389 if (conn->immqueue == ERR_PTR(-ENOMEM))
1390 goto immqueue_alloc_fail;
1391
1392 conn->mgmtqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*),
1393 GFP_KERNEL, NULL);
1394 if (conn->mgmtqueue == ERR_PTR(-ENOMEM))
1395 goto mgmtqueue_alloc_fail;
1396
1397 INIT_WORK(&conn->xmitwork, iscsi_xmitworker, conn);
1398
1399 /* allocate login_mtask used for the login/text sequences */
1400 spin_lock_bh(&session->lock);
1401 if (!__kfifo_get(session->mgmtpool.queue,
1402 (void*)&conn->login_mtask,
1403 sizeof(void*))) {
1404 spin_unlock_bh(&session->lock);
1405 goto login_mtask_alloc_fail;
1406 }
1407 spin_unlock_bh(&session->lock);
1408
d36ab6f3
MC		 1409 data = kmalloc(DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH, GFP_KERNEL);
1410 if (!data)
1411 goto login_mtask_data_alloc_fail;
c8dc1e52 1412 conn->login_mtask->data = conn->data = data;
d36ab6f3 1413
7996a778
MC		 1414 init_timer(&conn->tmabort_timer);
1415 mutex_init(&conn->xmitmutex);
1416 init_waitqueue_head(&conn->ehwait);
1417
1418 return cls_conn;
1419
d36ab6f3
MC		 1420login_mtask_data_alloc_fail:
1421 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
1422 sizeof(void*));
7996a778
MC		 1423login_mtask_alloc_fail:
1424 kfifo_free(conn->mgmtqueue);
1425mgmtqueue_alloc_fail:
1426 kfifo_free(conn->immqueue);
1427immqueue_alloc_fail:
7996a778
MC		 1428 iscsi_destroy_conn(cls_conn);
1429 return NULL;
1430}
1431EXPORT_SYMBOL_GPL(iscsi_conn_setup);
1432
1433/**
1434 * iscsi_conn_teardown - teardown iscsi connection
1435 * cls_conn: iscsi class connection
1436 *
1437 * TODO: we may need to make this into a two step process
1438 * like scsi-mls remove + put host
1439 */
1440void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
1441{
1442 struct iscsi_conn *conn = cls_conn->dd_data;
1443 struct iscsi_session *session = conn->session;
1444 unsigned long flags;
1445
7996a778 1446 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
67a61114 1447 mutex_lock(&conn->xmitmutex);
7996a778
MC		 1448
1449 spin_lock_bh(&session->lock);
1450 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
1451 if (session->leadconn == conn) {
1452 /*
1453 * leading connection? then give up on recovery.
1454 */
1455 session->state = ISCSI_STATE_TERMINATE;
1456 wake_up(&conn->ehwait);
1457 }
1458 spin_unlock_bh(&session->lock);
1459
1460 mutex_unlock(&conn->xmitmutex);
1461
1462 /*
1463 * Block until all in-progress commands for this connection
1464 * time out or fail.
1465 */
1466 for (;;) {
1467 spin_lock_irqsave(session->host->host_lock, flags);
1468 if (!session->host->host_busy) { /* OK for ERL == 0 */
1469 spin_unlock_irqrestore(session->host->host_lock, flags);
1470 break;
1471 }
1472 spin_unlock_irqrestore(session->host->host_lock, flags);
1473 msleep_interruptible(500);
be2df72e
OG		 1474 printk(KERN_INFO "iscsi: scsi conn_destroy(): host_busy %d "
1475 "host_failed %d\n", session->host->host_busy,
1476 session->host->host_failed);
7996a778
MC		 1477 /*
1478 * force eh_abort() to unblock
1479 */
1480 wake_up(&conn->ehwait);
1481 }
1482
1483 spin_lock_bh(&session->lock);
c8dc1e52 1484 kfree(conn->data);
7996a778
MC		 1485 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
1486 sizeof(void*));
1487 list_del(&conn->item);
1488 if (list_empty(&session->connections))
1489 session->leadconn = NULL;
1490 if (session->leadconn && session->leadconn == conn)
1491 session->leadconn = container_of(session->connections.next,
1492 struct iscsi_conn, item);
1493
1494 if (session->leadconn == NULL)
1495 /* no connections exits.. reset sequencing */
1496 session->cmdsn = session->max_cmdsn = session->exp_cmdsn = 1;
1497 spin_unlock_bh(&session->lock);
1498
7996a778
MC		 1499 kfifo_free(conn->immqueue);
1500 kfifo_free(conn->mgmtqueue);
1501
1502 iscsi_destroy_conn(cls_conn);
1503}
1504EXPORT_SYMBOL_GPL(iscsi_conn_teardown);
1505
1506int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
1507{
1508 struct iscsi_conn *conn = cls_conn->dd_data;
1509 struct iscsi_session *session = conn->session;
1510
1511 if (session == NULL) {
1512 printk(KERN_ERR "iscsi: can't start unbound connection\n");
1513 return -EPERM;
1514 }
1515
1516 spin_lock_bh(&session->lock);
1517 conn->c_stage = ISCSI_CONN_STARTED;
1518 session->state = ISCSI_STATE_LOGGED_IN;
1519
1520 switch(conn->stop_stage) {
1521 case STOP_CONN_RECOVER:
1522 /*
1523 * unblock eh_abort() if it is blocked. re-try all
1524 * commands after successful recovery
1525 */
7996a778
MC		 1526 conn->stop_stage = 0;
1527 conn->tmabort_state = TMABORT_INITIAL;
1528 session->age++;
7996a778
MC		 1529 spin_unlock_bh(&session->lock);
1530
1531 iscsi_unblock_session(session_to_cls(session));
1532 wake_up(&conn->ehwait);
1533 return 0;
1534 case STOP_CONN_TERM:
7996a778 1535 conn->stop_stage = 0;
7996a778
MC		 1536 break;
1537 default:
1538 break;
1539 }
1540 spin_unlock_bh(&session->lock);
1541
1542 return 0;
1543}
1544EXPORT_SYMBOL_GPL(iscsi_conn_start);
1545
1546static void
1547flush_control_queues(struct iscsi_session *session, struct iscsi_conn *conn)
1548{
1549 struct iscsi_mgmt_task *mtask, *tmp;
1550
1551 /* handle pending */
1552 while (__kfifo_get(conn->immqueue, (void*)&mtask, sizeof(void*)) ||
1553 __kfifo_get(conn->mgmtqueue, (void*)&mtask, sizeof(void*))) {
1554 if (mtask == conn->login_mtask)
1555 continue;
1556 debug_scsi("flushing pending mgmt task itt 0x%x\n", mtask->itt);
1557 __kfifo_put(session->mgmtpool.queue, (void*)&mtask,
1558 sizeof(void*));
1559 }
1560
1561 /* handle running */
1562 list_for_each_entry_safe(mtask, tmp, &conn->mgmt_run_list, running) {
1563 debug_scsi("flushing running mgmt task itt 0x%x\n", mtask->itt);
ed2abc7f
MC		 1564 list_del(&mtask->running);
1565
7996a778
MC		 1566 if (mtask == conn->login_mtask)
1567 continue;
ed2abc7f 1568 __kfifo_put(session->mgmtpool.queue, (void*)&mtask,
7996a778
MC		 1569 sizeof(void*));
1570 }
1571
1572 conn->mtask = NULL;
1573}
1574
1575/* Fail commands. Mutex and session lock held and recv side suspended */
1576static void fail_all_commands(struct iscsi_conn *conn)
1577{
1578 struct iscsi_cmd_task *ctask, *tmp;
1579
1580 /* flush pending */
b6c395ed 1581 list_for_each_entry_safe(ctask, tmp, &conn->xmitqueue, running) {
7996a778
MC		 1582 debug_scsi("failing pending sc %p itt 0x%x\n", ctask->sc,
1583 ctask->itt);
1584 fail_command(conn, ctask, DID_BUS_BUSY << 16);
1585 }
1586
1587 /* fail all other running */
1588 list_for_each_entry_safe(ctask, tmp, &conn->run_list, running) {
1589 debug_scsi("failing in progress sc %p itt 0x%x\n",
1590 ctask->sc, ctask->itt);
1591 fail_command(conn, ctask, DID_BUS_BUSY << 16);
1592 }
1593
1594 conn->ctask = NULL;
1595}
1596
656cffc9
MC		 1597static void iscsi_start_session_recovery(struct iscsi_session *session,
1598 struct iscsi_conn *conn, int flag)
7996a778 1599{
ed2abc7f
MC		 1600 int old_stop_stage;
1601
7996a778 1602 spin_lock_bh(&session->lock);
ed2abc7f 1603 if (conn->stop_stage == STOP_CONN_TERM) {
7996a778
MC		 1604 spin_unlock_bh(&session->lock);
1605 return;
1606 }
ed2abc7f
MC		 1607
1608 /*
1609 * When this is called for the in_login state, we only want to clean
67a61114
MC		 1610 * up the login task and connection. We do not need to block and set
1611 * the recovery state again
ed2abc7f 1612 */
67a61114
MC		 1613 if (flag == STOP_CONN_TERM)
1614 session->state = ISCSI_STATE_TERMINATE;
1615 else if (conn->stop_stage != STOP_CONN_RECOVER)
1616 session->state = ISCSI_STATE_IN_RECOVERY;
ed2abc7f
MC		 1617
1618 old_stop_stage = conn->stop_stage;
7996a778 1619 conn->stop_stage = flag;
67a61114
MC		 1620 conn->c_stage = ISCSI_CONN_STOPPED;
1621 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
7996a778
MC		 1622 spin_unlock_bh(&session->lock);
1623
1c83469d
MC		 1624 write_lock_bh(conn->recv_lock);
1625 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
1626 write_unlock_bh(conn->recv_lock);
7996a778
MC		 1627
1628 mutex_lock(&conn->xmitmutex);
7996a778
MC		 1629 /*
1630 * for connection level recovery we should not calculate
1631 * header digest. conn->hdr_size used for optimization
1632 * in hdr_extract() and will be re-negotiated at
1633 * set_param() time.
1634 */
1635 if (flag == STOP_CONN_RECOVER) {
1636 conn->hdrdgst_en = 0;
1637 conn->datadgst_en = 0;
656cffc9 1638 if (session->state == ISCSI_STATE_IN_RECOVERY &&
67a61114
MC		 1639 old_stop_stage != STOP_CONN_RECOVER) {
1640 debug_scsi("blocking session\n");
7996a778 1641 iscsi_block_session(session_to_cls(session));
67a61114 1642 }
7996a778 1643 }
656cffc9 1644
656cffc9
MC		 1645 /*
1646 * flush queues.
1647 */
1648 spin_lock_bh(&session->lock);
1649 fail_all_commands(conn);
1650 flush_control_queues(session, conn);
1651 spin_unlock_bh(&session->lock);
1652
7996a778
MC		 1653 mutex_unlock(&conn->xmitmutex);
1654}
7996a778
MC		 1655
1656void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
1657{
1658 struct iscsi_conn *conn = cls_conn->dd_data;
1659 struct iscsi_session *session = conn->session;
1660
1661 switch (flag) {
1662 case STOP_CONN_RECOVER:
1663 case STOP_CONN_TERM:
1664 iscsi_start_session_recovery(session, conn, flag);
8d2860b3 1665 break;
7996a778 1666 default:
be2df72e 1667 printk(KERN_ERR "iscsi: invalid stop flag %d\n", flag);
7996a778
MC		 1668 }
1669}
1670EXPORT_SYMBOL_GPL(iscsi_conn_stop);
1671
1672int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
1673 struct iscsi_cls_conn *cls_conn, int is_leading)
1674{
1675 struct iscsi_session *session = class_to_transport_session(cls_session);
1676 struct iscsi_conn *tmp = ERR_PTR(-EEXIST), *conn = cls_conn->dd_data;
1677
1678 /* lookup for existing connection */
1679 spin_lock_bh(&session->lock);
1680 list_for_each_entry(tmp, &session->connections, item) {
1681 if (tmp == conn) {
1682 if (conn->c_stage != ISCSI_CONN_STOPPED ||
1683 conn->stop_stage == STOP_CONN_TERM) {
be2df72e 1684 printk(KERN_ERR "iscsi: can't bind "
7996a778
MC		 1685 "non-stopped connection (%d:%d)\n",
1686 conn->c_stage, conn->stop_stage);
1687 spin_unlock_bh(&session->lock);
1688 return -EIO;
1689 }
1690 break;
1691 }
1692 }
1693 if (tmp != conn) {
1694 /* bind new iSCSI connection to session */
1695 conn->session = session;
1696 list_add(&conn->item, &session->connections);
1697 }
1698 spin_unlock_bh(&session->lock);
1699
1700 if (is_leading)
1701 session->leadconn = conn;
1702
1703 /*
1704 * Unblock xmitworker(), Login Phase will pass through.
1705 */
1706 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
1707 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1708 return 0;
1709}
1710EXPORT_SYMBOL_GPL(iscsi_conn_bind);
1711
a54a52ca
MC		 1712
1713int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
1714 enum iscsi_param param, char *buf, int buflen)
1715{
1716 struct iscsi_conn *conn = cls_conn->dd_data;
1717 struct iscsi_session *session = conn->session;
1718 uint32_t value;
1719
1720 switch(param) {
1721 case ISCSI_PARAM_MAX_RECV_DLENGTH:
1722 sscanf(buf, "%d", &conn->max_recv_dlength);
1723 break;
1724 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
1725 sscanf(buf, "%d", &conn->max_xmit_dlength);
1726 break;
1727 case ISCSI_PARAM_HDRDGST_EN:
1728 sscanf(buf, "%d", &conn->hdrdgst_en);
1729 break;
1730 case ISCSI_PARAM_DATADGST_EN:
1731 sscanf(buf, "%d", &conn->datadgst_en);
1732 break;
1733 case ISCSI_PARAM_INITIAL_R2T_EN:
1734 sscanf(buf, "%d", &session->initial_r2t_en);
1735 break;
1736 case ISCSI_PARAM_MAX_R2T:
1737 sscanf(buf, "%d", &session->max_r2t);
1738 break;
1739 case ISCSI_PARAM_IMM_DATA_EN:
1740 sscanf(buf, "%d", &session->imm_data_en);
1741 break;
1742 case ISCSI_PARAM_FIRST_BURST:
1743 sscanf(buf, "%d", &session->first_burst);
1744 break;
1745 case ISCSI_PARAM_MAX_BURST:
1746 sscanf(buf, "%d", &session->max_burst);
1747 break;
1748 case ISCSI_PARAM_PDU_INORDER_EN:
1749 sscanf(buf, "%d", &session->pdu_inorder_en);
1750 break;
1751 case ISCSI_PARAM_DATASEQ_INORDER_EN:
1752 sscanf(buf, "%d", &session->dataseq_inorder_en);
1753 break;
1754 case ISCSI_PARAM_ERL:
1755 sscanf(buf, "%d", &session->erl);
1756 break;
1757 case ISCSI_PARAM_IFMARKER_EN:
1758 sscanf(buf, "%d", &value);
1759 BUG_ON(value);
1760 break;
1761 case ISCSI_PARAM_OFMARKER_EN:
1762 sscanf(buf, "%d", &value);
1763 BUG_ON(value);
1764 break;
1765 case ISCSI_PARAM_EXP_STATSN:
1766 sscanf(buf, "%u", &conn->exp_statsn);
1767 break;
1768 case ISCSI_PARAM_TARGET_NAME:
1769 /* this should not change between logins */
1770 if (session->targetname)
1771 break;
1772
1773 session->targetname = kstrdup(buf, GFP_KERNEL);
1774 if (!session->targetname)
1775 return -ENOMEM;
1776 break;
1777 case ISCSI_PARAM_TPGT:
1778 sscanf(buf, "%d", &session->tpgt);
1779 break;
1780 case ISCSI_PARAM_PERSISTENT_PORT:
1781 sscanf(buf, "%d", &conn->persistent_port);
1782 break;
1783 case ISCSI_PARAM_PERSISTENT_ADDRESS:
1784 /*
1785 * this is the address returned in discovery so it should
1786 * not change between logins.
1787 */
1788 if (conn->persistent_address)
1789 break;
1790
1791 conn->persistent_address = kstrdup(buf, GFP_KERNEL);
1792 if (!conn->persistent_address)
1793 return -ENOMEM;
1794 break;
1795 default:
1796 return -ENOSYS;
1797 }
1798
1799 return 0;
1800}
1801EXPORT_SYMBOL_GPL(iscsi_set_param);
1802
1803int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
1804 enum iscsi_param param, char *buf)
1805{
1806 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
1807 struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
1808 int len;
1809
1810 switch(param) {
1811 case ISCSI_PARAM_INITIAL_R2T_EN:
1812 len = sprintf(buf, "%d\n", session->initial_r2t_en);
1813 break;
1814 case ISCSI_PARAM_MAX_R2T:
1815 len = sprintf(buf, "%hu\n", session->max_r2t);
1816 break;
1817 case ISCSI_PARAM_IMM_DATA_EN:
1818 len = sprintf(buf, "%d\n", session->imm_data_en);
1819 break;
1820 case ISCSI_PARAM_FIRST_BURST:
1821 len = sprintf(buf, "%u\n", session->first_burst);
1822 break;
1823 case ISCSI_PARAM_MAX_BURST:
1824 len = sprintf(buf, "%u\n", session->max_burst);
1825 break;
1826 case ISCSI_PARAM_PDU_INORDER_EN:
1827 len = sprintf(buf, "%d\n", session->pdu_inorder_en);
1828 break;
1829 case ISCSI_PARAM_DATASEQ_INORDER_EN:
1830 len = sprintf(buf, "%d\n", session->dataseq_inorder_en);
1831 break;
1832 case ISCSI_PARAM_ERL:
1833 len = sprintf(buf, "%d\n", session->erl);
1834 break;
1835 case ISCSI_PARAM_TARGET_NAME:
1836 len = sprintf(buf, "%s\n", session->targetname);
1837 break;
1838 case ISCSI_PARAM_TPGT:
1839 len = sprintf(buf, "%d\n", session->tpgt);
1840 break;
1841 default:
1842 return -ENOSYS;
1843 }
1844
1845 return len;
1846}
1847EXPORT_SYMBOL_GPL(iscsi_session_get_param);
1848
1849int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
1850 enum iscsi_param param, char *buf)
1851{
1852 struct iscsi_conn *conn = cls_conn->dd_data;
1853 int len;
1854
1855 switch(param) {
1856 case ISCSI_PARAM_MAX_RECV_DLENGTH:
1857 len = sprintf(buf, "%u\n", conn->max_recv_dlength);
1858 break;
1859 case ISCSI_PARAM_MAX_XMIT_DLENGTH:
1860 len = sprintf(buf, "%u\n", conn->max_xmit_dlength);
1861 break;
1862 case ISCSI_PARAM_HDRDGST_EN:
1863 len = sprintf(buf, "%d\n", conn->hdrdgst_en);
1864 break;
1865 case ISCSI_PARAM_DATADGST_EN:
1866 len = sprintf(buf, "%d\n", conn->datadgst_en);
1867 break;
1868 case ISCSI_PARAM_IFMARKER_EN:
1869 len = sprintf(buf, "%d\n", conn->ifmarker_en);
1870 break;
1871 case ISCSI_PARAM_OFMARKER_EN:
1872 len = sprintf(buf, "%d\n", conn->ofmarker_en);
1873 break;
1874 case ISCSI_PARAM_EXP_STATSN:
1875 len = sprintf(buf, "%u\n", conn->exp_statsn);
1876 break;
1877 case ISCSI_PARAM_PERSISTENT_PORT:
1878 len = sprintf(buf, "%d\n", conn->persistent_port);
1879 break;
1880 case ISCSI_PARAM_PERSISTENT_ADDRESS:
1881 len = sprintf(buf, "%s\n", conn->persistent_address);
1882 break;
1883 default:
1884 return -ENOSYS;
1885 }
1886
1887 return len;
1888}
1889EXPORT_SYMBOL_GPL(iscsi_conn_get_param);
1890
7996a778
MC		 1891MODULE_AUTHOR("Mike Christie");
1892MODULE_DESCRIPTION("iSCSI library functions");
1893MODULE_LICENSE("GPL");
Linux 6.x block layer and io_uring tree(s)