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[SCSI] libiscsi: fix iscsi cmdsn allocation
[mv-sheeva.git] / drivers / scsi / libiscsi.c
1 /*
2  * iSCSI lib functions
3  *
4  * Copyright (C) 2006 Red Hat, Inc.  All rights reserved.
5  * Copyright (C) 2004 - 2006 Mike Christie
6  * Copyright (C) 2004 - 2005 Dmitry Yusupov
7  * Copyright (C) 2004 - 2005 Alex Aizman
8  * maintained by open-iscsi@googlegroups.com
9  *
10  * This program is free software; you can redistribute it and/or modify
11  * it under the terms of the GNU General Public License as published by
12  * the Free Software Foundation; either version 2 of the License, or
13  * (at your option) any later version.
14  *
15  * This program is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18  * GNU General Public License for more details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with this program; if not, write to the Free Software
22  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23  */
24 #include <linux/types.h>
25 #include <linux/kfifo.h>
26 #include <linux/delay.h>
27 #include <asm/unaligned.h>
28 #include <net/tcp.h>
29 #include <scsi/scsi_cmnd.h>
30 #include <scsi/scsi_device.h>
31 #include <scsi/scsi_eh.h>
32 #include <scsi/scsi_tcq.h>
33 #include <scsi/scsi_host.h>
34 #include <scsi/scsi.h>
35 #include <scsi/iscsi_proto.h>
36 #include <scsi/scsi_transport.h>
37 #include <scsi/scsi_transport_iscsi.h>
38 #include <scsi/libiscsi.h>
39
40 struct iscsi_session *
41 class_to_transport_session(struct iscsi_cls_session *cls_session)
42 {
43         struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
44         return iscsi_hostdata(shost->hostdata);
45 }
46 EXPORT_SYMBOL_GPL(class_to_transport_session);
47
48 /* Serial Number Arithmetic, 32 bits, less than, RFC1982 */
49 #define SNA32_CHECK 2147483648UL
50
51 static int iscsi_sna_lt(u32 n1, u32 n2)
52 {
53         return n1 != n2 && ((n1 < n2 && (n2 - n1 < SNA32_CHECK)) ||
54                             (n1 > n2 && (n2 - n1 < SNA32_CHECK)));
55 }
56
57 /* Serial Number Arithmetic, 32 bits, less than, RFC1982 */
58 static int iscsi_sna_lte(u32 n1, u32 n2)
59 {
60         return n1 == n2 || ((n1 < n2 && (n2 - n1 < SNA32_CHECK)) ||
61                             (n1 > n2 && (n2 - n1 < SNA32_CHECK)));
62 }
63
64 void
65 iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr)
66 {
67         uint32_t max_cmdsn = be32_to_cpu(hdr->max_cmdsn);
68         uint32_t exp_cmdsn = be32_to_cpu(hdr->exp_cmdsn);
69
70         /*
71          * standard specifies this check for when to update expected and
72          * max sequence numbers
73          */
74         if (iscsi_sna_lt(max_cmdsn, exp_cmdsn - 1))
75                 return;
76
77         if (exp_cmdsn != session->exp_cmdsn &&
78             !iscsi_sna_lt(exp_cmdsn, session->exp_cmdsn))
79                 session->exp_cmdsn = exp_cmdsn;
80
81         if (max_cmdsn != session->max_cmdsn &&
82             !iscsi_sna_lt(max_cmdsn, session->max_cmdsn)) {
83                 session->max_cmdsn = max_cmdsn;
84                 /*
85                  * if the window closed with IO queued, then kick the
86                  * xmit thread
87                  */
88                 if (!list_empty(&session->leadconn->xmitqueue) ||
89                     __kfifo_len(session->leadconn->mgmtqueue))
90                         scsi_queue_work(session->host,
91                                         &session->leadconn->xmitwork);
92         }
93 }
94 EXPORT_SYMBOL_GPL(iscsi_update_cmdsn);
95
96 void iscsi_prep_unsolicit_data_pdu(struct iscsi_cmd_task *ctask,
97                                    struct iscsi_data *hdr)
98 {
99         struct iscsi_conn *conn = ctask->conn;
100
101         memset(hdr, 0, sizeof(struct iscsi_data));
102         hdr->ttt = cpu_to_be32(ISCSI_RESERVED_TAG);
103         hdr->datasn = cpu_to_be32(ctask->unsol_datasn);
104         ctask->unsol_datasn++;
105         hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
106         memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
107
108         hdr->itt = ctask->hdr->itt;
109         hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
110         hdr->offset = cpu_to_be32(ctask->unsol_offset);
111
112         if (ctask->unsol_count > conn->max_xmit_dlength) {
113                 hton24(hdr->dlength, conn->max_xmit_dlength);
114                 ctask->data_count = conn->max_xmit_dlength;
115                 ctask->unsol_offset += ctask->data_count;
116                 hdr->flags = 0;
117         } else {
118                 hton24(hdr->dlength, ctask->unsol_count);
119                 ctask->data_count = ctask->unsol_count;
120                 hdr->flags = ISCSI_FLAG_CMD_FINAL;
121         }
122 }
123 EXPORT_SYMBOL_GPL(iscsi_prep_unsolicit_data_pdu);
124
125 /**
126  * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
127  * @ctask: iscsi cmd task
128  *
129  * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set
130  * fields like dlength or final based on how much data it sends
131  */
132 static void iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask)
133 {
134         struct iscsi_conn *conn = ctask->conn;
135         struct iscsi_session *session = conn->session;
136         struct iscsi_cmd *hdr = ctask->hdr;
137         struct scsi_cmnd *sc = ctask->sc;
138
139         hdr->opcode = ISCSI_OP_SCSI_CMD;
140         hdr->flags = ISCSI_ATTR_SIMPLE;
141         int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun);
142         hdr->itt = build_itt(ctask->itt, conn->id, session->age);
143         hdr->data_length = cpu_to_be32(sc->request_bufflen);
144         hdr->cmdsn = cpu_to_be32(session->cmdsn);
145         session->cmdsn++;
146         hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
147         memcpy(hdr->cdb, sc->cmnd, sc->cmd_len);
148         if (sc->cmd_len < MAX_COMMAND_SIZE)
149                 memset(&hdr->cdb[sc->cmd_len], 0,
150                         MAX_COMMAND_SIZE - sc->cmd_len);
151
152         ctask->data_count = 0;
153         ctask->imm_count = 0;
154         if (sc->sc_data_direction == DMA_TO_DEVICE) {
155                 hdr->flags |= ISCSI_FLAG_CMD_WRITE;
156                 /*
157                  * Write counters:
158                  *
159                  *      imm_count       bytes to be sent right after
160                  *                      SCSI PDU Header
161                  *
162                  *      unsol_count     bytes(as Data-Out) to be sent
163                  *                      without R2T ack right after
164                  *                      immediate data
165                  *
166                  *      r2t_data_count  bytes to be sent via R2T ack's
167                  *
168                  *      pad_count       bytes to be sent as zero-padding
169                  */
170                 ctask->unsol_count = 0;
171                 ctask->unsol_offset = 0;
172                 ctask->unsol_datasn = 0;
173
174                 if (session->imm_data_en) {
175                         if (sc->request_bufflen >= session->first_burst)
176                                 ctask->imm_count = min(session->first_burst,
177                                                         conn->max_xmit_dlength);
178                         else
179                                 ctask->imm_count = min(sc->request_bufflen,
180                                                         conn->max_xmit_dlength);
181                         hton24(ctask->hdr->dlength, ctask->imm_count);
182                 } else
183                         zero_data(ctask->hdr->dlength);
184
185                 if (!session->initial_r2t_en) {
186                         ctask->unsol_count = min((session->first_burst),
187                                 (sc->request_bufflen)) - ctask->imm_count;
188                         ctask->unsol_offset = ctask->imm_count;
189                 }
190
191                 if (!ctask->unsol_count)
192                         /* No unsolicit Data-Out's */
193                         ctask->hdr->flags |= ISCSI_FLAG_CMD_FINAL;
194         } else {
195                 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
196                 zero_data(hdr->dlength);
197
198                 if (sc->sc_data_direction == DMA_FROM_DEVICE)
199                         hdr->flags |= ISCSI_FLAG_CMD_READ;
200         }
201
202         conn->scsicmd_pdus_cnt++;
203
204         debug_scsi("iscsi prep [%s cid %d sc %p cdb 0x%x itt 0x%x len %d "
205                 "cmdsn %d win %d]\n",
206                 sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read",
207                 conn->id, sc, sc->cmnd[0], ctask->itt, sc->request_bufflen,
208                 session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1);
209 }
210
211 /**
212  * iscsi_complete_command - return command back to scsi-ml
213  * @ctask: iscsi cmd task
214  *
215  * Must be called with session lock.
216  * This function returns the scsi command to scsi-ml and returns
217  * the cmd task to the pool of available cmd tasks.
218  */
219 static void iscsi_complete_command(struct iscsi_cmd_task *ctask)
220 {
221         struct iscsi_session *session = ctask->conn->session;
222         struct scsi_cmnd *sc = ctask->sc;
223
224         ctask->state = ISCSI_TASK_COMPLETED;
225         ctask->sc = NULL;
226         /* SCSI eh reuses commands to verify us */
227         sc->SCp.ptr = NULL;
228         list_del_init(&ctask->running);
229         __kfifo_put(session->cmdpool.queue, (void*)&ctask, sizeof(void*));
230         sc->scsi_done(sc);
231 }
232
233 static void __iscsi_get_ctask(struct iscsi_cmd_task *ctask)
234 {
235         atomic_inc(&ctask->refcount);
236 }
237
238 static void __iscsi_put_ctask(struct iscsi_cmd_task *ctask)
239 {
240         if (atomic_dec_and_test(&ctask->refcount))
241                 iscsi_complete_command(ctask);
242 }
243
244 /**
245  * iscsi_cmd_rsp - SCSI Command Response processing
246  * @conn: iscsi connection
247  * @hdr: iscsi header
248  * @ctask: scsi command task
249  * @data: cmd data buffer
250  * @datalen: len of buffer
251  *
252  * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and
253  * then completes the command and task.
254  **/
255 static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
256                                struct iscsi_cmd_task *ctask, char *data,
257                                int datalen)
258 {
259         struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)hdr;
260         struct iscsi_session *session = conn->session;
261         struct scsi_cmnd *sc = ctask->sc;
262
263         iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr);
264         conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
265
266         sc->result = (DID_OK << 16) | rhdr->cmd_status;
267
268         if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) {
269                 sc->result = DID_ERROR << 16;
270                 goto out;
271         }
272
273         if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) {
274                 uint16_t senselen;
275
276                 if (datalen < 2) {
277 invalid_datalen:
278                         printk(KERN_ERR "iscsi: Got CHECK_CONDITION but "
279                                "invalid data buffer size of %d\n", datalen);
280                         sc->result = DID_BAD_TARGET << 16;
281                         goto out;
282                 }
283
284                 senselen = be16_to_cpu(get_unaligned((__be16 *) data));
285                 if (datalen < senselen)
286                         goto invalid_datalen;
287
288                 memcpy(sc->sense_buffer, data + 2,
289                        min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
290                 debug_scsi("copied %d bytes of sense\n",
291                            min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
292         }
293
294         if (sc->sc_data_direction == DMA_TO_DEVICE)
295                 goto out;
296
297         if (rhdr->flags & ISCSI_FLAG_CMD_UNDERFLOW) {
298                 int res_count = be32_to_cpu(rhdr->residual_count);
299
300                 if (res_count > 0 && res_count <= sc->request_bufflen)
301                         sc->resid = res_count;
302                 else
303                         sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
304         } else if (rhdr->flags & ISCSI_FLAG_CMD_BIDI_UNDERFLOW)
305                 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
306         else if (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW)
307                 sc->resid = be32_to_cpu(rhdr->residual_count);
308
309 out:
310         debug_scsi("done [sc %lx res %d itt 0x%x]\n",
311                    (long)sc, sc->result, ctask->itt);
312         conn->scsirsp_pdus_cnt++;
313
314         __iscsi_put_ctask(ctask);
315 }
316
317 static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
318 {
319         struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr;
320
321         conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
322         conn->tmfrsp_pdus_cnt++;
323
324         if (conn->tmabort_state != TMABORT_INITIAL)
325                 return;
326
327         if (tmf->response == ISCSI_TMF_RSP_COMPLETE)
328                 conn->tmabort_state = TMABORT_SUCCESS;
329         else if (tmf->response == ISCSI_TMF_RSP_NO_TASK)
330                 conn->tmabort_state = TMABORT_NOT_FOUND;
331         else
332                 conn->tmabort_state = TMABORT_FAILED;
333         wake_up(&conn->ehwait);
334 }
335
336 static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
337                                char *data, int datalen)
338 {
339         struct iscsi_reject *reject = (struct iscsi_reject *)hdr;
340         struct iscsi_hdr rejected_pdu;
341         uint32_t itt;
342
343         conn->exp_statsn = be32_to_cpu(reject->statsn) + 1;
344
345         if (reject->reason == ISCSI_REASON_DATA_DIGEST_ERROR) {
346                 if (ntoh24(reject->dlength) > datalen)
347                         return ISCSI_ERR_PROTO;
348
349                 if (ntoh24(reject->dlength) >= sizeof(struct iscsi_hdr)) {
350                         memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr));
351                         itt = get_itt(rejected_pdu.itt);
352                         printk(KERN_ERR "itt 0x%x had pdu (op 0x%x) rejected "
353                                 "due to DataDigest error.\n", itt,
354                                 rejected_pdu.opcode);
355                 }
356         }
357         return 0;
358 }
359
360 /**
361  * __iscsi_complete_pdu - complete pdu
362  * @conn: iscsi conn
363  * @hdr: iscsi header
364  * @data: data buffer
365  * @datalen: len of data buffer
366  *
367  * Completes pdu processing by freeing any resources allocated at
368  * queuecommand or send generic. session lock must be held and verify
369  * itt must have been called.
370  */
371 int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
372                          char *data, int datalen)
373 {
374         struct iscsi_session *session = conn->session;
375         int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0;
376         struct iscsi_cmd_task *ctask;
377         struct iscsi_mgmt_task *mtask;
378         uint32_t itt;
379
380         if (hdr->itt != RESERVED_ITT)
381                 itt = get_itt(hdr->itt);
382         else
383                 itt = ~0U;
384
385         if (itt < session->cmds_max) {
386                 ctask = session->cmds[itt];
387
388                 debug_scsi("cmdrsp [op 0x%x cid %d itt 0x%x len %d]\n",
389                            opcode, conn->id, ctask->itt, datalen);
390
391                 switch(opcode) {
392                 case ISCSI_OP_SCSI_CMD_RSP:
393                         BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
394                         iscsi_scsi_cmd_rsp(conn, hdr, ctask, data,
395                                            datalen);
396                         break;
397                 case ISCSI_OP_SCSI_DATA_IN:
398                         BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
399                         if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
400                                 conn->scsirsp_pdus_cnt++;
401                                 __iscsi_put_ctask(ctask);
402                         }
403                         break;
404                 case ISCSI_OP_R2T:
405                         /* LLD handles this for now */
406                         break;
407                 default:
408                         rc = ISCSI_ERR_BAD_OPCODE;
409                         break;
410                 }
411         } else if (itt >= ISCSI_MGMT_ITT_OFFSET &&
412                    itt < ISCSI_MGMT_ITT_OFFSET + session->mgmtpool_max) {
413                 mtask = session->mgmt_cmds[itt - ISCSI_MGMT_ITT_OFFSET];
414
415                 debug_scsi("immrsp [op 0x%x cid %d itt 0x%x len %d]\n",
416                            opcode, conn->id, mtask->itt, datalen);
417
418                 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
419                 switch(opcode) {
420                 case ISCSI_OP_LOGOUT_RSP:
421                         if (datalen) {
422                                 rc = ISCSI_ERR_PROTO;
423                                 break;
424                         }
425                         conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
426                         /* fall through */
427                 case ISCSI_OP_LOGIN_RSP:
428                 case ISCSI_OP_TEXT_RSP:
429                         /*
430                          * login related PDU's exp_statsn is handled in
431                          * userspace
432                          */
433                         if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
434                                 rc = ISCSI_ERR_CONN_FAILED;
435                         list_del(&mtask->running);
436                         if (conn->login_mtask != mtask)
437                                 __kfifo_put(session->mgmtpool.queue,
438                                             (void*)&mtask, sizeof(void*));
439                         break;
440                 case ISCSI_OP_SCSI_TMFUNC_RSP:
441                         if (datalen) {
442                                 rc = ISCSI_ERR_PROTO;
443                                 break;
444                         }
445
446                         iscsi_tmf_rsp(conn, hdr);
447                         break;
448                 case ISCSI_OP_NOOP_IN:
449                         if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) {
450                                 rc = ISCSI_ERR_PROTO;
451                                 break;
452                         }
453                         conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
454
455                         if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
456                                 rc = ISCSI_ERR_CONN_FAILED;
457                         list_del(&mtask->running);
458                         if (conn->login_mtask != mtask)
459                                 __kfifo_put(session->mgmtpool.queue,
460                                             (void*)&mtask, sizeof(void*));
461                         break;
462                 default:
463                         rc = ISCSI_ERR_BAD_OPCODE;
464                         break;
465                 }
466         } else if (itt == ~0U) {
467                 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr);
468
469                 switch(opcode) {
470                 case ISCSI_OP_NOOP_IN:
471                         if (datalen) {
472                                 rc = ISCSI_ERR_PROTO;
473                                 break;
474                         }
475
476                         if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG))
477                                 break;
478
479                         if (iscsi_recv_pdu(conn->cls_conn, hdr, NULL, 0))
480                                 rc = ISCSI_ERR_CONN_FAILED;
481                         break;
482                 case ISCSI_OP_REJECT:
483                         rc = iscsi_handle_reject(conn, hdr, data, datalen);
484                         break;
485                 case ISCSI_OP_ASYNC_EVENT:
486                         conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
487                         if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
488                                 rc = ISCSI_ERR_CONN_FAILED;
489                         break;
490                 default:
491                         rc = ISCSI_ERR_BAD_OPCODE;
492                         break;
493                 }
494         } else
495                 rc = ISCSI_ERR_BAD_ITT;
496
497         return rc;
498 }
499 EXPORT_SYMBOL_GPL(__iscsi_complete_pdu);
500
501 int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
502                        char *data, int datalen)
503 {
504         int rc;
505
506         spin_lock(&conn->session->lock);
507         rc = __iscsi_complete_pdu(conn, hdr, data, datalen);
508         spin_unlock(&conn->session->lock);
509         return rc;
510 }
511 EXPORT_SYMBOL_GPL(iscsi_complete_pdu);
512
513 /* verify itt (itt encoding: age+cid+itt) */
514 int iscsi_verify_itt(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
515                      uint32_t *ret_itt)
516 {
517         struct iscsi_session *session = conn->session;
518         struct iscsi_cmd_task *ctask;
519         uint32_t itt;
520
521         if (hdr->itt != RESERVED_ITT) {
522                 if (((__force u32)hdr->itt & ISCSI_AGE_MASK) !=
523                     (session->age << ISCSI_AGE_SHIFT)) {
524                         printk(KERN_ERR "iscsi: received itt %x expected "
525                                 "session age (%x)\n", (__force u32)hdr->itt,
526                                 session->age & ISCSI_AGE_MASK);
527                         return ISCSI_ERR_BAD_ITT;
528                 }
529
530                 if (((__force u32)hdr->itt & ISCSI_CID_MASK) !=
531                     (conn->id << ISCSI_CID_SHIFT)) {
532                         printk(KERN_ERR "iscsi: received itt %x, expected "
533                                 "CID (%x)\n", (__force u32)hdr->itt, conn->id);
534                         return ISCSI_ERR_BAD_ITT;
535                 }
536                 itt = get_itt(hdr->itt);
537         } else
538                 itt = ~0U;
539
540         if (itt < session->cmds_max) {
541                 ctask = session->cmds[itt];
542
543                 if (!ctask->sc) {
544                         printk(KERN_INFO "iscsi: dropping ctask with "
545                                "itt 0x%x\n", ctask->itt);
546                         /* force drop */
547                         return ISCSI_ERR_NO_SCSI_CMD;
548                 }
549
550                 if (ctask->sc->SCp.phase != session->age) {
551                         printk(KERN_ERR "iscsi: ctask's session age %d, "
552                                 "expected %d\n", ctask->sc->SCp.phase,
553                                 session->age);
554                         return ISCSI_ERR_SESSION_FAILED;
555                 }
556         }
557
558         *ret_itt = itt;
559         return 0;
560 }
561 EXPORT_SYMBOL_GPL(iscsi_verify_itt);
562
563 void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
564 {
565         struct iscsi_session *session = conn->session;
566         unsigned long flags;
567
568         spin_lock_irqsave(&session->lock, flags);
569         if (session->state == ISCSI_STATE_FAILED) {
570                 spin_unlock_irqrestore(&session->lock, flags);
571                 return;
572         }
573
574         if (conn->stop_stage == 0)
575                 session->state = ISCSI_STATE_FAILED;
576         spin_unlock_irqrestore(&session->lock, flags);
577         set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
578         set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
579         iscsi_conn_error(conn->cls_conn, err);
580 }
581 EXPORT_SYMBOL_GPL(iscsi_conn_failure);
582
583 static void iscsi_prep_mtask(struct iscsi_conn *conn,
584                              struct iscsi_mgmt_task *mtask)
585 {
586         struct iscsi_session *session = conn->session;
587         struct iscsi_hdr *hdr = mtask->hdr;
588         struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
589
590         if (hdr->opcode != (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) &&
591             hdr->opcode != (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
592                 nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
593         /*
594          * pre-format CmdSN for outgoing PDU.
595          */
596         nop->cmdsn = cpu_to_be32(session->cmdsn);
597         if (hdr->itt != RESERVED_ITT) {
598                 hdr->itt = build_itt(mtask->itt, conn->id, session->age);
599                 if (conn->c_stage == ISCSI_CONN_STARTED &&
600                     !(hdr->opcode & ISCSI_OP_IMMEDIATE))
601                         session->cmdsn++;
602         }
603
604         if (session->tt->init_mgmt_task)
605                 session->tt->init_mgmt_task(conn, mtask);
606
607         debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n",
608                    hdr->opcode, hdr->itt, mtask->data_count);
609 }
610
611 static int iscsi_xmit_mtask(struct iscsi_conn *conn)
612 {
613         struct iscsi_hdr *hdr = conn->mtask->hdr;
614         int rc, was_logout = 0;
615
616         spin_unlock_bh(&conn->session->lock);
617         if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT) {
618                 conn->session->state = ISCSI_STATE_IN_RECOVERY;
619                 iscsi_block_session(session_to_cls(conn->session));
620                 was_logout = 1;
621         }
622         rc = conn->session->tt->xmit_mgmt_task(conn, conn->mtask);
623         spin_lock_bh(&conn->session->lock);
624         if (rc)
625                 return rc;
626
627         /* done with this in-progress mtask */
628         conn->mtask = NULL;
629
630         if (was_logout) {
631                 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
632                 return -ENODATA;
633         }
634         return 0;
635 }
636
637 static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn)
638 {
639         struct iscsi_session *session = conn->session;
640
641         /*
642          * Check for iSCSI window and take care of CmdSN wrap-around
643          */
644         if (!iscsi_sna_lte(session->cmdsn, session->max_cmdsn)) {
645                 debug_scsi("iSCSI CmdSN closed. MaxCmdSN %u CmdSN %u\n",
646                            session->max_cmdsn, session->cmdsn);
647                 return -ENOSPC;
648         }
649         return 0;
650 }
651
652 static int iscsi_xmit_ctask(struct iscsi_conn *conn)
653 {
654         struct iscsi_cmd_task *ctask = conn->ctask;
655         int rc = 0;
656
657         /*
658          * serialize with TMF AbortTask
659          */
660         if (ctask->state == ISCSI_TASK_ABORTING)
661                 goto done;
662
663         __iscsi_get_ctask(ctask);
664         spin_unlock_bh(&conn->session->lock);
665         rc = conn->session->tt->xmit_cmd_task(conn, ctask);
666         spin_lock_bh(&conn->session->lock);
667         __iscsi_put_ctask(ctask);
668
669 done:
670         if (!rc)
671                 /* done with this ctask */
672                 conn->ctask = NULL;
673         return rc;
674 }
675
676 /**
677  * iscsi_data_xmit - xmit any command into the scheduled connection
678  * @conn: iscsi connection
679  *
680  * Notes:
681  *      The function can return -EAGAIN in which case the caller must
682  *      re-schedule it again later or recover. '0' return code means
683  *      successful xmit.
684  **/
685 static int iscsi_data_xmit(struct iscsi_conn *conn)
686 {
687         int rc = 0;
688
689         spin_lock_bh(&conn->session->lock);
690         if (unlikely(conn->suspend_tx)) {
691                 debug_scsi("conn %d Tx suspended!\n", conn->id);
692                 spin_unlock_bh(&conn->session->lock);
693                 return -ENODATA;
694         }
695
696         if (conn->ctask) {
697                 rc = iscsi_xmit_ctask(conn);
698                 if (rc)
699                         goto again;
700         }
701
702         if (conn->mtask) {
703                 rc = iscsi_xmit_mtask(conn);
704                 if (rc)
705                         goto again;
706         }
707
708         /*
709          * process mgmt pdus like nops before commands since we should
710          * only have one nop-out as a ping from us and targets should not
711          * overflow us with nop-ins
712          */
713 check_mgmt:
714         while (__kfifo_get(conn->mgmtqueue, (void*)&conn->mtask,
715                            sizeof(void*))) {
716                 iscsi_prep_mtask(conn, conn->mtask);
717                 list_add_tail(&conn->mtask->running, &conn->mgmt_run_list);
718                 rc = iscsi_xmit_mtask(conn);
719                 if (rc)
720                         goto again;
721         }
722
723         /* process command queue */
724         while (!list_empty(&conn->xmitqueue)) {
725                 rc = iscsi_check_cmdsn_window_closed(conn);
726                 if (rc) {
727                         spin_unlock_bh(&conn->session->lock);
728                         return rc;
729                 }
730                 /*
731                  * iscsi tcp may readd the task to the xmitqueue to send
732                  * write data
733                  */
734                 conn->ctask = list_entry(conn->xmitqueue.next,
735                                          struct iscsi_cmd_task, running);
736                 if (conn->ctask->state == ISCSI_TASK_PENDING) {
737                         iscsi_prep_scsi_cmd_pdu(conn->ctask);
738                         conn->session->tt->init_cmd_task(conn->ctask);
739                 }
740                 conn->ctask->state = ISCSI_TASK_RUNNING;
741                 list_move_tail(conn->xmitqueue.next, &conn->run_list);
742                 rc = iscsi_xmit_ctask(conn);
743                 if (rc)
744                         goto again;
745                 /*
746                  * we could continuously get new ctask requests so
747                  * we need to check the mgmt queue for nops that need to
748                  * be sent to aviod starvation
749                  */
750                 if (__kfifo_len(conn->mgmtqueue))
751                         goto check_mgmt;
752         }
753         spin_unlock_bh(&conn->session->lock);
754         return -ENODATA;
755
756 again:
757         if (unlikely(conn->suspend_tx))
758                 rc = -ENODATA;
759         spin_unlock_bh(&conn->session->lock);
760         return rc;
761 }
762
763 static void iscsi_xmitworker(struct work_struct *work)
764 {
765         struct iscsi_conn *conn =
766                 container_of(work, struct iscsi_conn, xmitwork);
767         int rc;
768         /*
769          * serialize Xmit worker on a per-connection basis.
770          */
771         do {
772                 rc = iscsi_data_xmit(conn);
773         } while (rc >= 0 || rc == -EAGAIN);
774 }
775
776 enum {
777         FAILURE_BAD_HOST = 1,
778         FAILURE_SESSION_FAILED,
779         FAILURE_SESSION_FREED,
780         FAILURE_WINDOW_CLOSED,
781         FAILURE_OOM,
782         FAILURE_SESSION_TERMINATE,
783         FAILURE_SESSION_IN_RECOVERY,
784         FAILURE_SESSION_RECOVERY_TIMEOUT,
785 };
786
787 int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
788 {
789         struct Scsi_Host *host;
790         int reason = 0;
791         struct iscsi_session *session;
792         struct iscsi_conn *conn;
793         struct iscsi_cmd_task *ctask = NULL;
794
795         sc->scsi_done = done;
796         sc->result = 0;
797         sc->SCp.ptr = NULL;
798
799         host = sc->device->host;
800         session = iscsi_hostdata(host->hostdata);
801
802         spin_lock(&session->lock);
803
804         /*
805          * ISCSI_STATE_FAILED is a temp. state. The recovery
806          * code will decide what is best to do with command queued
807          * during this time
808          */
809         if (session->state != ISCSI_STATE_LOGGED_IN &&
810             session->state != ISCSI_STATE_FAILED) {
811                 /*
812                  * to handle the race between when we set the recovery state
813                  * and block the session we requeue here (commands could
814                  * be entering our queuecommand while a block is starting
815                  * up because the block code is not locked)
816                  */
817                 if (session->state == ISCSI_STATE_IN_RECOVERY) {
818                         reason = FAILURE_SESSION_IN_RECOVERY;
819                         goto reject;
820                 }
821
822                 if (session->state == ISCSI_STATE_RECOVERY_FAILED)
823                         reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
824                 else if (session->state == ISCSI_STATE_TERMINATE)
825                         reason = FAILURE_SESSION_TERMINATE;
826                 else
827                         reason = FAILURE_SESSION_FREED;
828                 goto fault;
829         }
830
831         conn = session->leadconn;
832         if (!conn) {
833                 reason = FAILURE_SESSION_FREED;
834                 goto fault;
835         }
836
837         /*
838          * We check this here and in data xmit, because if we get to the point
839          * that this check is hitting the window then we have enough IO in
840          * flight and enough IO waiting to be transmitted it is better
841          * to let the scsi/block layer queue up.
842          */
843         if (iscsi_check_cmdsn_window_closed(conn)) {
844                 reason = FAILURE_WINDOW_CLOSED;
845                 goto reject;
846         }
847
848         if (!__kfifo_get(session->cmdpool.queue, (void*)&ctask,
849                          sizeof(void*))) {
850                 reason = FAILURE_OOM;
851                 goto reject;
852         }
853         sc->SCp.phase = session->age;
854         sc->SCp.ptr = (char *)ctask;
855
856         atomic_set(&ctask->refcount, 1);
857         ctask->state = ISCSI_TASK_PENDING;
858         ctask->mtask = NULL;
859         ctask->conn = conn;
860         ctask->sc = sc;
861         INIT_LIST_HEAD(&ctask->running);
862
863         list_add_tail(&ctask->running, &conn->xmitqueue);
864         spin_unlock(&session->lock);
865
866         scsi_queue_work(host, &conn->xmitwork);
867         return 0;
868
869 reject:
870         spin_unlock(&session->lock);
871         debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason);
872         return SCSI_MLQUEUE_HOST_BUSY;
873
874 fault:
875         spin_unlock(&session->lock);
876         printk(KERN_ERR "iscsi: cmd 0x%x is not queued (%d)\n",
877                sc->cmnd[0], reason);
878         sc->result = (DID_NO_CONNECT << 16);
879         sc->resid = sc->request_bufflen;
880         sc->scsi_done(sc);
881         return 0;
882 }
883 EXPORT_SYMBOL_GPL(iscsi_queuecommand);
884
885 int iscsi_change_queue_depth(struct scsi_device *sdev, int depth)
886 {
887         if (depth > ISCSI_MAX_CMD_PER_LUN)
888                 depth = ISCSI_MAX_CMD_PER_LUN;
889         scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
890         return sdev->queue_depth;
891 }
892 EXPORT_SYMBOL_GPL(iscsi_change_queue_depth);
893
894 static struct iscsi_mgmt_task *
895 __iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
896                       char *data, uint32_t data_size)
897 {
898         struct iscsi_session *session = conn->session;
899         struct iscsi_mgmt_task *mtask;
900
901         if (session->state == ISCSI_STATE_TERMINATE)
902                 return NULL;
903
904         if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) ||
905             hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
906                 /*
907                  * Login and Text are sent serially, in
908                  * request-followed-by-response sequence.
909                  * Same mtask can be used. Same ITT must be used.
910                  * Note that login_mtask is preallocated at conn_create().
911                  */
912                 mtask = conn->login_mtask;
913         else {
914                 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
915                 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
916
917                 if (!__kfifo_get(session->mgmtpool.queue,
918                                  (void*)&mtask, sizeof(void*)))
919                         return NULL;
920         }
921
922         if (data_size) {
923                 memcpy(mtask->data, data, data_size);
924                 mtask->data_count = data_size;
925         } else
926                 mtask->data_count = 0;
927
928         INIT_LIST_HEAD(&mtask->running);
929         memcpy(mtask->hdr, hdr, sizeof(struct iscsi_hdr));
930         __kfifo_put(conn->mgmtqueue, (void*)&mtask, sizeof(void*));
931         return mtask;
932 }
933
934 int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr,
935                         char *data, uint32_t data_size)
936 {
937         struct iscsi_conn *conn = cls_conn->dd_data;
938         struct iscsi_session *session = conn->session;
939         int err = 0;
940
941         spin_lock_bh(&session->lock);
942         if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size))
943                 err = -EPERM;
944         spin_unlock_bh(&session->lock);
945         scsi_queue_work(session->host, &conn->xmitwork);
946         return err;
947 }
948 EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu);
949
950 void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
951 {
952         struct iscsi_session *session = class_to_transport_session(cls_session);
953         struct iscsi_conn *conn = session->leadconn;
954
955         spin_lock_bh(&session->lock);
956         if (session->state != ISCSI_STATE_LOGGED_IN) {
957                 session->state = ISCSI_STATE_RECOVERY_FAILED;
958                 if (conn)
959                         wake_up(&conn->ehwait);
960         }
961         spin_unlock_bh(&session->lock);
962 }
963 EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
964
965 int iscsi_eh_host_reset(struct scsi_cmnd *sc)
966 {
967         struct Scsi_Host *host = sc->device->host;
968         struct iscsi_session *session = iscsi_hostdata(host->hostdata);
969         struct iscsi_conn *conn = session->leadconn;
970         int fail_session = 0;
971
972         spin_lock_bh(&session->lock);
973         if (session->state == ISCSI_STATE_TERMINATE) {
974 failed:
975                 debug_scsi("failing host reset: session terminated "
976                            "[CID %d age %d]\n", conn->id, session->age);
977                 spin_unlock_bh(&session->lock);
978                 return FAILED;
979         }
980
981         if (sc->SCp.phase == session->age) {
982                 debug_scsi("failing connection CID %d due to SCSI host reset\n",
983                            conn->id);
984                 fail_session = 1;
985         }
986         spin_unlock_bh(&session->lock);
987
988         /*
989          * we drop the lock here but the leadconn cannot be destoyed while
990          * we are in the scsi eh
991          */
992         if (fail_session)
993                 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
994
995         debug_scsi("iscsi_eh_host_reset wait for relogin\n");
996         wait_event_interruptible(conn->ehwait,
997                                  session->state == ISCSI_STATE_TERMINATE ||
998                                  session->state == ISCSI_STATE_LOGGED_IN ||
999                                  session->state == ISCSI_STATE_RECOVERY_FAILED);
1000         if (signal_pending(current))
1001                 flush_signals(current);
1002
1003         spin_lock_bh(&session->lock);
1004         if (session->state == ISCSI_STATE_LOGGED_IN)
1005                 printk(KERN_INFO "iscsi: host reset succeeded\n");
1006         else
1007                 goto failed;
1008         spin_unlock_bh(&session->lock);
1009
1010         return SUCCESS;
1011 }
1012 EXPORT_SYMBOL_GPL(iscsi_eh_host_reset);
1013
1014 static void iscsi_tmabort_timedout(unsigned long data)
1015 {
1016         struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)data;
1017         struct iscsi_conn *conn = ctask->conn;
1018         struct iscsi_session *session = conn->session;
1019
1020         spin_lock(&session->lock);
1021         if (conn->tmabort_state == TMABORT_INITIAL) {
1022                 conn->tmabort_state = TMABORT_TIMEDOUT;
1023                 debug_scsi("tmabort timedout [sc %p itt 0x%x]\n",
1024                         ctask->sc, ctask->itt);
1025                 /* unblock eh_abort() */
1026                 wake_up(&conn->ehwait);
1027         }
1028         spin_unlock(&session->lock);
1029 }
1030
1031 static int iscsi_exec_abort_task(struct scsi_cmnd *sc,
1032                                  struct iscsi_cmd_task *ctask)
1033 {
1034         struct iscsi_conn *conn = ctask->conn;
1035         struct iscsi_session *session = conn->session;
1036         struct iscsi_tm *hdr = &conn->tmhdr;
1037
1038         /*
1039          * ctask timed out but session is OK requests must be serialized.
1040          */
1041         memset(hdr, 0, sizeof(struct iscsi_tm));
1042         hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
1043         hdr->flags = ISCSI_TM_FUNC_ABORT_TASK;
1044         hdr->flags |= ISCSI_FLAG_CMD_FINAL;
1045         memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
1046         hdr->rtt = ctask->hdr->itt;
1047         hdr->refcmdsn = ctask->hdr->cmdsn;
1048
1049         ctask->mtask = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr,
1050                                             NULL, 0);
1051         if (!ctask->mtask) {
1052                 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1053                 debug_scsi("abort sent failure [itt 0x%x]\n", ctask->itt);
1054                 return -EPERM;
1055         }
1056         ctask->state = ISCSI_TASK_ABORTING;
1057
1058         debug_scsi("abort sent [itt 0x%x]\n", ctask->itt);
1059
1060         if (conn->tmabort_state == TMABORT_INITIAL) {
1061                 conn->tmfcmd_pdus_cnt++;
1062                 conn->tmabort_timer.expires = 20*HZ + jiffies;
1063                 conn->tmabort_timer.function = iscsi_tmabort_timedout;
1064                 conn->tmabort_timer.data = (unsigned long)ctask;
1065                 add_timer(&conn->tmabort_timer);
1066                 debug_scsi("abort set timeout [itt 0x%x]\n", ctask->itt);
1067         }
1068         spin_unlock_bh(&session->lock);
1069         scsi_queue_work(session->host, &conn->xmitwork);
1070
1071         /*
1072          * block eh thread until:
1073          *
1074          * 1) abort response
1075          * 2) abort timeout
1076          * 3) session is terminated or restarted or userspace has
1077          * given up on recovery
1078          */
1079         wait_event_interruptible(conn->ehwait,
1080                                  sc->SCp.phase != session->age ||
1081                                  session->state != ISCSI_STATE_LOGGED_IN ||
1082                                  conn->tmabort_state != TMABORT_INITIAL);
1083         if (signal_pending(current))
1084                 flush_signals(current);
1085         del_timer_sync(&conn->tmabort_timer);
1086         spin_lock_bh(&session->lock);
1087         return 0;
1088 }
1089
1090 /*
1091  * session lock must be held
1092  */
1093 static struct iscsi_mgmt_task *
1094 iscsi_remove_mgmt_task(struct kfifo *fifo, uint32_t itt)
1095 {
1096         int i, nr_tasks = __kfifo_len(fifo) / sizeof(void*);
1097         struct iscsi_mgmt_task *task;
1098
1099         debug_scsi("searching %d tasks\n", nr_tasks);
1100
1101         for (i = 0; i < nr_tasks; i++) {
1102                 __kfifo_get(fifo, (void*)&task, sizeof(void*));
1103                 debug_scsi("check task %u\n", task->itt);
1104
1105                 if (task->itt == itt) {
1106                         debug_scsi("matched task\n");
1107                         return task;
1108                 }
1109
1110                 __kfifo_put(fifo, (void*)&task, sizeof(void*));
1111         }
1112         return NULL;
1113 }
1114
1115 static int iscsi_ctask_mtask_cleanup(struct iscsi_cmd_task *ctask)
1116 {
1117         struct iscsi_conn *conn = ctask->conn;
1118         struct iscsi_session *session = conn->session;
1119
1120         if (!ctask->mtask)
1121                 return -EINVAL;
1122
1123         if (!iscsi_remove_mgmt_task(conn->mgmtqueue, ctask->mtask->itt))
1124                 list_del(&ctask->mtask->running);
1125         __kfifo_put(session->mgmtpool.queue, (void*)&ctask->mtask,
1126                     sizeof(void*));
1127         ctask->mtask = NULL;
1128         return 0;
1129 }
1130
1131 /*
1132  * session lock must be held
1133  */
1134 static void fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
1135                          int err)
1136 {
1137         struct scsi_cmnd *sc;
1138
1139         sc = ctask->sc;
1140         if (!sc)
1141                 return;
1142
1143         if (ctask->state != ISCSI_TASK_PENDING)
1144                 conn->session->tt->cleanup_cmd_task(conn, ctask);
1145         iscsi_ctask_mtask_cleanup(ctask);
1146
1147         sc->result = err;
1148         sc->resid = sc->request_bufflen;
1149         if (conn->ctask == ctask)
1150                 conn->ctask = NULL;
1151         /* release ref from queuecommand */
1152         __iscsi_put_ctask(ctask);
1153 }
1154
1155 int iscsi_eh_abort(struct scsi_cmnd *sc)
1156 {
1157         struct iscsi_cmd_task *ctask;
1158         struct iscsi_conn *conn;
1159         struct iscsi_session *session;
1160         int rc;
1161
1162         /*
1163          * if session was ISCSI_STATE_IN_RECOVERY then we may not have
1164          * got the command.
1165          */
1166         if (!sc->SCp.ptr) {
1167                 debug_scsi("sc never reached iscsi layer or it completed.\n");
1168                 return SUCCESS;
1169         }
1170
1171         ctask = (struct iscsi_cmd_task *)sc->SCp.ptr;
1172         conn = ctask->conn;
1173         session = conn->session;
1174
1175         conn->eh_abort_cnt++;
1176         debug_scsi("aborting [sc %p itt 0x%x]\n", sc, ctask->itt);
1177
1178         spin_lock_bh(&session->lock);
1179
1180         /*
1181          * If we are not logged in or we have started a new session
1182          * then let the host reset code handle this
1183          */
1184         if (session->state != ISCSI_STATE_LOGGED_IN ||
1185             sc->SCp.phase != session->age)
1186                 goto failed;
1187
1188         /* ctask completed before time out */
1189         if (!ctask->sc) {
1190                 debug_scsi("sc completed while abort in progress\n");
1191                 goto success;
1192         }
1193
1194         /* what should we do here ? */
1195         if (conn->ctask == ctask) {
1196                 printk(KERN_INFO "iscsi: sc %p itt 0x%x partially sent. "
1197                        "Failing abort\n", sc, ctask->itt);
1198                 goto failed;
1199         }
1200
1201         if (ctask->state == ISCSI_TASK_PENDING) {
1202                 fail_command(conn, ctask, DID_ABORT << 16);
1203                 goto success;
1204         }
1205
1206         conn->tmabort_state = TMABORT_INITIAL;
1207         rc = iscsi_exec_abort_task(sc, ctask);
1208         if (rc || sc->SCp.phase != session->age ||
1209             session->state != ISCSI_STATE_LOGGED_IN)
1210                 goto failed;
1211         iscsi_ctask_mtask_cleanup(ctask);
1212
1213         switch (conn->tmabort_state) {
1214         case TMABORT_SUCCESS:
1215                 spin_unlock_bh(&session->lock);
1216                 /*
1217                  * clean up task if aborted. grab the recv lock as a writer
1218                  */
1219                 write_lock_bh(conn->recv_lock);
1220                 spin_lock(&session->lock);
1221                 fail_command(conn, ctask, DID_ABORT << 16);
1222                 spin_unlock(&session->lock);
1223                 write_unlock_bh(conn->recv_lock);
1224                 /*
1225                  * make sure xmit thread is not still touching the
1226                  * ctask/scsi_cmnd
1227                  */
1228                 scsi_flush_work(session->host);
1229                 goto success_unlocked;
1230         case TMABORT_NOT_FOUND:
1231                 if (!ctask->sc) {
1232                         /* ctask completed before tmf abort response */
1233                         debug_scsi("sc completed while abort in progress\n");
1234                         goto success;
1235                 }
1236                 /* fall through */
1237         default:
1238                 /* timedout or failed */
1239                 spin_unlock_bh(&session->lock);
1240                 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1241                 goto failed_unlocked;
1242         }
1243
1244 success:
1245         spin_unlock_bh(&session->lock);
1246 success_unlocked:
1247         debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
1248         return SUCCESS;
1249
1250 failed:
1251         spin_unlock_bh(&session->lock);
1252 failed_unlocked:
1253         debug_scsi("abort failed [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
1254         return FAILED;
1255 }
1256 EXPORT_SYMBOL_GPL(iscsi_eh_abort);
1257
1258 int
1259 iscsi_pool_init(struct iscsi_queue *q, int max, void ***items, int item_size)
1260 {
1261         int i;
1262
1263         *items = kmalloc(max * sizeof(void*), GFP_KERNEL);
1264         if (*items == NULL)
1265                 return -ENOMEM;
1266
1267         q->max = max;
1268         q->pool = kmalloc(max * sizeof(void*), GFP_KERNEL);
1269         if (q->pool == NULL) {
1270                 kfree(*items);
1271                 return -ENOMEM;
1272         }
1273
1274         q->queue = kfifo_init((void*)q->pool, max * sizeof(void*),
1275                               GFP_KERNEL, NULL);
1276         if (q->queue == ERR_PTR(-ENOMEM)) {
1277                 kfree(q->pool);
1278                 kfree(*items);
1279                 return -ENOMEM;
1280         }
1281
1282         for (i = 0; i < max; i++) {
1283                 q->pool[i] = kmalloc(item_size, GFP_KERNEL);
1284                 if (q->pool[i] == NULL) {
1285                         int j;
1286
1287                         for (j = 0; j < i; j++)
1288                                 kfree(q->pool[j]);
1289
1290                         kfifo_free(q->queue);
1291                         kfree(q->pool);
1292                         kfree(*items);
1293                         return -ENOMEM;
1294                 }
1295                 memset(q->pool[i], 0, item_size);
1296                 (*items)[i] = q->pool[i];
1297                 __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*));
1298         }
1299         return 0;
1300 }
1301 EXPORT_SYMBOL_GPL(iscsi_pool_init);
1302
1303 void iscsi_pool_free(struct iscsi_queue *q, void **items)
1304 {
1305         int i;
1306
1307         for (i = 0; i < q->max; i++)
1308                 kfree(items[i]);
1309         kfree(q->pool);
1310         kfree(items);
1311 }
1312 EXPORT_SYMBOL_GPL(iscsi_pool_free);
1313
1314 /*
1315  * iSCSI Session's hostdata organization:
1316  *
1317  *    *------------------* <== hostdata_session(host->hostdata)
1318  *    | ptr to class sess|
1319  *    |------------------| <== iscsi_hostdata(host->hostdata)
1320  *    | iscsi_session    |
1321  *    *------------------*
1322  */
1323
1324 #define hostdata_privsize(_sz)  (sizeof(unsigned long) + _sz + \
1325                                  _sz % sizeof(unsigned long))
1326
1327 #define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata))
1328
1329 /**
1330  * iscsi_session_setup - create iscsi cls session and host and session
1331  * @scsit: scsi transport template
1332  * @iscsit: iscsi transport template
1333  * @initial_cmdsn: initial CmdSN
1334  * @hostno: host no allocated
1335  *
1336  * This can be used by software iscsi_transports that allocate
1337  * a session per scsi host.
1338  **/
1339 struct iscsi_cls_session *
1340 iscsi_session_setup(struct iscsi_transport *iscsit,
1341                     struct scsi_transport_template *scsit,
1342                     int cmd_task_size, int mgmt_task_size,
1343                     uint32_t initial_cmdsn, uint32_t *hostno)
1344 {
1345         struct Scsi_Host *shost;
1346         struct iscsi_session *session;
1347         struct iscsi_cls_session *cls_session;
1348         int cmd_i;
1349
1350         shost = scsi_host_alloc(iscsit->host_template,
1351                                 hostdata_privsize(sizeof(*session)));
1352         if (!shost)
1353                 return NULL;
1354
1355         shost->max_id = 1;
1356         shost->max_channel = 0;
1357         shost->max_lun = iscsit->max_lun;
1358         shost->max_cmd_len = iscsit->max_cmd_len;
1359         shost->transportt = scsit;
1360         shost->transportt->create_work_queue = 1;
1361         *hostno = shost->host_no;
1362
1363         session = iscsi_hostdata(shost->hostdata);
1364         memset(session, 0, sizeof(struct iscsi_session));
1365         session->host = shost;
1366         session->state = ISCSI_STATE_FREE;
1367         session->mgmtpool_max = ISCSI_MGMT_CMDS_MAX;
1368         session->cmds_max = ISCSI_XMIT_CMDS_MAX;
1369         session->cmdsn = initial_cmdsn;
1370         session->exp_cmdsn = initial_cmdsn + 1;
1371         session->max_cmdsn = initial_cmdsn + 1;
1372         session->max_r2t = 1;
1373         session->tt = iscsit;
1374
1375         /* initialize SCSI PDU commands pool */
1376         if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
1377                             (void***)&session->cmds,
1378                             cmd_task_size + sizeof(struct iscsi_cmd_task)))
1379                 goto cmdpool_alloc_fail;
1380
1381         /* pre-format cmds pool with ITT */
1382         for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
1383                 struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
1384
1385                 if (cmd_task_size)
1386                         ctask->dd_data = &ctask[1];
1387                 ctask->itt = cmd_i;
1388                 INIT_LIST_HEAD(&ctask->running);
1389         }
1390
1391         spin_lock_init(&session->lock);
1392
1393         /* initialize immediate command pool */
1394         if (iscsi_pool_init(&session->mgmtpool, session->mgmtpool_max,
1395                            (void***)&session->mgmt_cmds,
1396                            mgmt_task_size + sizeof(struct iscsi_mgmt_task)))
1397                 goto mgmtpool_alloc_fail;
1398
1399
1400         /* pre-format immediate cmds pool with ITT */
1401         for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) {
1402                 struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i];
1403
1404                 if (mgmt_task_size)
1405                         mtask->dd_data = &mtask[1];
1406                 mtask->itt = ISCSI_MGMT_ITT_OFFSET + cmd_i;
1407                 INIT_LIST_HEAD(&mtask->running);
1408         }
1409
1410         if (scsi_add_host(shost, NULL))
1411                 goto add_host_fail;
1412
1413         if (!try_module_get(iscsit->owner))
1414                 goto cls_session_fail;
1415
1416         cls_session = iscsi_create_session(shost, iscsit, 0);
1417         if (!cls_session)
1418                 goto module_put;
1419         *(unsigned long*)shost->hostdata = (unsigned long)cls_session;
1420
1421         return cls_session;
1422
1423 module_put:
1424         module_put(iscsit->owner);
1425 cls_session_fail:
1426         scsi_remove_host(shost);
1427 add_host_fail:
1428         iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
1429 mgmtpool_alloc_fail:
1430         iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
1431 cmdpool_alloc_fail:
1432         scsi_host_put(shost);
1433         return NULL;
1434 }
1435 EXPORT_SYMBOL_GPL(iscsi_session_setup);
1436
1437 /**
1438  * iscsi_session_teardown - destroy session, host, and cls_session
1439  * shost: scsi host
1440  *
1441  * This can be used by software iscsi_transports that allocate
1442  * a session per scsi host.
1443  **/
1444 void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
1445 {
1446         struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
1447         struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
1448         struct module *owner = cls_session->transport->owner;
1449
1450         scsi_remove_host(shost);
1451
1452         iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
1453         iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
1454
1455         kfree(session->password);
1456         kfree(session->password_in);
1457         kfree(session->username);
1458         kfree(session->username_in);
1459         kfree(session->targetname);
1460         kfree(session->hwaddress);
1461         kfree(session->initiatorname);
1462
1463         iscsi_destroy_session(cls_session);
1464         scsi_host_put(shost);
1465         module_put(owner);
1466 }
1467 EXPORT_SYMBOL_GPL(iscsi_session_teardown);
1468
1469 /**
1470  * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
1471  * @cls_session: iscsi_cls_session
1472  * @conn_idx: cid
1473  **/
1474 struct iscsi_cls_conn *
1475 iscsi_conn_setup(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
1476 {
1477         struct iscsi_session *session = class_to_transport_session(cls_session);
1478         struct iscsi_conn *conn;
1479         struct iscsi_cls_conn *cls_conn;
1480         char *data;
1481
1482         cls_conn = iscsi_create_conn(cls_session, conn_idx);
1483         if (!cls_conn)
1484                 return NULL;
1485         conn = cls_conn->dd_data;
1486         memset(conn, 0, sizeof(*conn));
1487
1488         conn->session = session;
1489         conn->cls_conn = cls_conn;
1490         conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
1491         conn->id = conn_idx;
1492         conn->exp_statsn = 0;
1493         conn->tmabort_state = TMABORT_INITIAL;
1494         INIT_LIST_HEAD(&conn->run_list);
1495         INIT_LIST_HEAD(&conn->mgmt_run_list);
1496         INIT_LIST_HEAD(&conn->xmitqueue);
1497
1498         /* initialize general immediate & non-immediate PDU commands queue */
1499         conn->mgmtqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*),
1500                                         GFP_KERNEL, NULL);
1501         if (conn->mgmtqueue == ERR_PTR(-ENOMEM))
1502                 goto mgmtqueue_alloc_fail;
1503
1504         INIT_WORK(&conn->xmitwork, iscsi_xmitworker);
1505
1506         /* allocate login_mtask used for the login/text sequences */
1507         spin_lock_bh(&session->lock);
1508         if (!__kfifo_get(session->mgmtpool.queue,
1509                          (void*)&conn->login_mtask,
1510                          sizeof(void*))) {
1511                 spin_unlock_bh(&session->lock);
1512                 goto login_mtask_alloc_fail;
1513         }
1514         spin_unlock_bh(&session->lock);
1515
1516         data = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN, GFP_KERNEL);
1517         if (!data)
1518                 goto login_mtask_data_alloc_fail;
1519         conn->login_mtask->data = conn->data = data;
1520
1521         init_timer(&conn->tmabort_timer);
1522         init_waitqueue_head(&conn->ehwait);
1523
1524         return cls_conn;
1525
1526 login_mtask_data_alloc_fail:
1527         __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
1528                     sizeof(void*));
1529 login_mtask_alloc_fail:
1530         kfifo_free(conn->mgmtqueue);
1531 mgmtqueue_alloc_fail:
1532         iscsi_destroy_conn(cls_conn);
1533         return NULL;
1534 }
1535 EXPORT_SYMBOL_GPL(iscsi_conn_setup);
1536
1537 /**
1538  * iscsi_conn_teardown - teardown iscsi connection
1539  * cls_conn: iscsi class connection
1540  *
1541  * TODO: we may need to make this into a two step process
1542  * like scsi-mls remove + put host
1543  */
1544 void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
1545 {
1546         struct iscsi_conn *conn = cls_conn->dd_data;
1547         struct iscsi_session *session = conn->session;
1548         unsigned long flags;
1549
1550         spin_lock_bh(&session->lock);
1551         set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1552         conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
1553         if (session->leadconn == conn) {
1554                 /*
1555                  * leading connection? then give up on recovery.
1556                  */
1557                 session->state = ISCSI_STATE_TERMINATE;
1558                 wake_up(&conn->ehwait);
1559         }
1560         spin_unlock_bh(&session->lock);
1561
1562         /*
1563          * Block until all in-progress commands for this connection
1564          * time out or fail.
1565          */
1566         for (;;) {
1567                 spin_lock_irqsave(session->host->host_lock, flags);
1568                 if (!session->host->host_busy) { /* OK for ERL == 0 */
1569                         spin_unlock_irqrestore(session->host->host_lock, flags);
1570                         break;
1571                 }
1572                 spin_unlock_irqrestore(session->host->host_lock, flags);
1573                 msleep_interruptible(500);
1574                 printk(KERN_INFO "iscsi: scsi conn_destroy(): host_busy %d "
1575                        "host_failed %d\n", session->host->host_busy,
1576                        session->host->host_failed);
1577                 /*
1578                  * force eh_abort() to unblock
1579                  */
1580                 wake_up(&conn->ehwait);
1581         }
1582
1583         /* flush queued up work because we free the connection below */
1584         scsi_flush_work(session->host);
1585
1586         spin_lock_bh(&session->lock);
1587         kfree(conn->data);
1588         kfree(conn->persistent_address);
1589         __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
1590                     sizeof(void*));
1591         if (session->leadconn == conn) {
1592                 session->leadconn = NULL;
1593                 /* no connections exits.. reset sequencing */
1594                 session->cmdsn = session->max_cmdsn = session->exp_cmdsn = 1;
1595         }
1596         spin_unlock_bh(&session->lock);
1597
1598         kfifo_free(conn->mgmtqueue);
1599
1600         iscsi_destroy_conn(cls_conn);
1601 }
1602 EXPORT_SYMBOL_GPL(iscsi_conn_teardown);
1603
1604 int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
1605 {
1606         struct iscsi_conn *conn = cls_conn->dd_data;
1607         struct iscsi_session *session = conn->session;
1608
1609         if (!session) {
1610                 printk(KERN_ERR "iscsi: can't start unbound connection\n");
1611                 return -EPERM;
1612         }
1613
1614         if ((session->imm_data_en || !session->initial_r2t_en) &&
1615              session->first_burst > session->max_burst) {
1616                 printk("iscsi: invalid burst lengths: "
1617                        "first_burst %d max_burst %d\n",
1618                        session->first_burst, session->max_burst);
1619                 return -EINVAL;
1620         }
1621
1622         spin_lock_bh(&session->lock);
1623         conn->c_stage = ISCSI_CONN_STARTED;
1624         session->state = ISCSI_STATE_LOGGED_IN;
1625
1626         switch(conn->stop_stage) {
1627         case STOP_CONN_RECOVER:
1628                 /*
1629                  * unblock eh_abort() if it is blocked. re-try all
1630                  * commands after successful recovery
1631                  */
1632                 conn->stop_stage = 0;
1633                 conn->tmabort_state = TMABORT_INITIAL;
1634                 session->age++;
1635                 spin_unlock_bh(&session->lock);
1636
1637                 iscsi_unblock_session(session_to_cls(session));
1638                 wake_up(&conn->ehwait);
1639                 return 0;
1640         case STOP_CONN_TERM:
1641                 conn->stop_stage = 0;
1642                 break;
1643         default:
1644                 break;
1645         }
1646         spin_unlock_bh(&session->lock);
1647
1648         return 0;
1649 }
1650 EXPORT_SYMBOL_GPL(iscsi_conn_start);
1651
1652 static void
1653 flush_control_queues(struct iscsi_session *session, struct iscsi_conn *conn)
1654 {
1655         struct iscsi_mgmt_task *mtask, *tmp;
1656
1657         /* handle pending */
1658         while (__kfifo_get(conn->mgmtqueue, (void*)&mtask, sizeof(void*))) {
1659                 if (mtask == conn->login_mtask)
1660                         continue;
1661                 debug_scsi("flushing pending mgmt task itt 0x%x\n", mtask->itt);
1662                 __kfifo_put(session->mgmtpool.queue, (void*)&mtask,
1663                             sizeof(void*));
1664         }
1665
1666         /* handle running */
1667         list_for_each_entry_safe(mtask, tmp, &conn->mgmt_run_list, running) {
1668                 debug_scsi("flushing running mgmt task itt 0x%x\n", mtask->itt);
1669                 list_del(&mtask->running);
1670
1671                 if (mtask == conn->login_mtask)
1672                         continue;
1673                 __kfifo_put(session->mgmtpool.queue, (void*)&mtask,
1674                            sizeof(void*));
1675         }
1676
1677         conn->mtask = NULL;
1678 }
1679
1680 /* Fail commands. Mutex and session lock held and recv side suspended */
1681 static void fail_all_commands(struct iscsi_conn *conn)
1682 {
1683         struct iscsi_cmd_task *ctask, *tmp;
1684
1685         /* flush pending */
1686         list_for_each_entry_safe(ctask, tmp, &conn->xmitqueue, running) {
1687                 debug_scsi("failing pending sc %p itt 0x%x\n", ctask->sc,
1688                            ctask->itt);
1689                 fail_command(conn, ctask, DID_BUS_BUSY << 16);
1690         }
1691
1692         /* fail all other running */
1693         list_for_each_entry_safe(ctask, tmp, &conn->run_list, running) {
1694                 debug_scsi("failing in progress sc %p itt 0x%x\n",
1695                            ctask->sc, ctask->itt);
1696                 fail_command(conn, ctask, DID_BUS_BUSY << 16);
1697         }
1698
1699         conn->ctask = NULL;
1700 }
1701
1702 static void iscsi_start_session_recovery(struct iscsi_session *session,
1703                                          struct iscsi_conn *conn, int flag)
1704 {
1705         int old_stop_stage;
1706
1707         spin_lock_bh(&session->lock);
1708         if (conn->stop_stage == STOP_CONN_TERM) {
1709                 spin_unlock_bh(&session->lock);
1710                 return;
1711         }
1712
1713         /*
1714          * When this is called for the in_login state, we only want to clean
1715          * up the login task and connection. We do not need to block and set
1716          * the recovery state again
1717          */
1718         if (flag == STOP_CONN_TERM)
1719                 session->state = ISCSI_STATE_TERMINATE;
1720         else if (conn->stop_stage != STOP_CONN_RECOVER)
1721                 session->state = ISCSI_STATE_IN_RECOVERY;
1722
1723         old_stop_stage = conn->stop_stage;
1724         conn->stop_stage = flag;
1725         conn->c_stage = ISCSI_CONN_STOPPED;
1726         set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1727         spin_unlock_bh(&session->lock);
1728         scsi_flush_work(session->host);
1729
1730         write_lock_bh(conn->recv_lock);
1731         set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
1732         write_unlock_bh(conn->recv_lock);
1733
1734         /*
1735          * for connection level recovery we should not calculate
1736          * header digest. conn->hdr_size used for optimization
1737          * in hdr_extract() and will be re-negotiated at
1738          * set_param() time.
1739          */
1740         if (flag == STOP_CONN_RECOVER) {
1741                 conn->hdrdgst_en = 0;
1742                 conn->datadgst_en = 0;
1743                 if (session->state == ISCSI_STATE_IN_RECOVERY &&
1744                     old_stop_stage != STOP_CONN_RECOVER) {
1745                         debug_scsi("blocking session\n");
1746                         iscsi_block_session(session_to_cls(session));
1747                 }
1748         }
1749
1750         /*
1751          * flush queues.
1752          */
1753         spin_lock_bh(&session->lock);
1754         fail_all_commands(conn);
1755         flush_control_queues(session, conn);
1756         spin_unlock_bh(&session->lock);
1757 }
1758
1759 void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
1760 {
1761         struct iscsi_conn *conn = cls_conn->dd_data;
1762         struct iscsi_session *session = conn->session;
1763
1764         switch (flag) {
1765         case STOP_CONN_RECOVER:
1766         case STOP_CONN_TERM:
1767                 iscsi_start_session_recovery(session, conn, flag);
1768                 break;
1769         default:
1770                 printk(KERN_ERR "iscsi: invalid stop flag %d\n", flag);
1771         }
1772 }
1773 EXPORT_SYMBOL_GPL(iscsi_conn_stop);
1774
1775 int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
1776                     struct iscsi_cls_conn *cls_conn, int is_leading)
1777 {
1778         struct iscsi_session *session = class_to_transport_session(cls_session);
1779         struct iscsi_conn *conn = cls_conn->dd_data;
1780
1781         spin_lock_bh(&session->lock);
1782         if (is_leading)
1783                 session->leadconn = conn;
1784         spin_unlock_bh(&session->lock);
1785
1786         /*
1787          * Unblock xmitworker(), Login Phase will pass through.
1788          */
1789         clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
1790         clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1791         return 0;
1792 }
1793 EXPORT_SYMBOL_GPL(iscsi_conn_bind);
1794
1795
1796 int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
1797                     enum iscsi_param param, char *buf, int buflen)
1798 {
1799         struct iscsi_conn *conn = cls_conn->dd_data;
1800         struct iscsi_session *session = conn->session;
1801         uint32_t value;
1802
1803         switch(param) {
1804         case ISCSI_PARAM_MAX_RECV_DLENGTH:
1805                 sscanf(buf, "%d", &conn->max_recv_dlength);
1806                 break;
1807         case ISCSI_PARAM_MAX_XMIT_DLENGTH:
1808                 sscanf(buf, "%d", &conn->max_xmit_dlength);
1809                 break;
1810         case ISCSI_PARAM_HDRDGST_EN:
1811                 sscanf(buf, "%d", &conn->hdrdgst_en);
1812                 break;
1813         case ISCSI_PARAM_DATADGST_EN:
1814                 sscanf(buf, "%d", &conn->datadgst_en);
1815                 break;
1816         case ISCSI_PARAM_INITIAL_R2T_EN:
1817                 sscanf(buf, "%d", &session->initial_r2t_en);
1818                 break;
1819         case ISCSI_PARAM_MAX_R2T:
1820                 sscanf(buf, "%d", &session->max_r2t);
1821                 break;
1822         case ISCSI_PARAM_IMM_DATA_EN:
1823                 sscanf(buf, "%d", &session->imm_data_en);
1824                 break;
1825         case ISCSI_PARAM_FIRST_BURST:
1826                 sscanf(buf, "%d", &session->first_burst);
1827                 break;
1828         case ISCSI_PARAM_MAX_BURST:
1829                 sscanf(buf, "%d", &session->max_burst);
1830                 break;
1831         case ISCSI_PARAM_PDU_INORDER_EN:
1832                 sscanf(buf, "%d", &session->pdu_inorder_en);
1833                 break;
1834         case ISCSI_PARAM_DATASEQ_INORDER_EN:
1835                 sscanf(buf, "%d", &session->dataseq_inorder_en);
1836                 break;
1837         case ISCSI_PARAM_ERL:
1838                 sscanf(buf, "%d", &session->erl);
1839                 break;
1840         case ISCSI_PARAM_IFMARKER_EN:
1841                 sscanf(buf, "%d", &value);
1842                 BUG_ON(value);
1843                 break;
1844         case ISCSI_PARAM_OFMARKER_EN:
1845                 sscanf(buf, "%d", &value);
1846                 BUG_ON(value);
1847                 break;
1848         case ISCSI_PARAM_EXP_STATSN:
1849                 sscanf(buf, "%u", &conn->exp_statsn);
1850                 break;
1851         case ISCSI_PARAM_USERNAME:
1852                 kfree(session->username);
1853                 session->username = kstrdup(buf, GFP_KERNEL);
1854                 if (!session->username)
1855                         return -ENOMEM;
1856                 break;
1857         case ISCSI_PARAM_USERNAME_IN:
1858                 kfree(session->username_in);
1859                 session->username_in = kstrdup(buf, GFP_KERNEL);
1860                 if (!session->username_in)
1861                         return -ENOMEM;
1862                 break;
1863         case ISCSI_PARAM_PASSWORD:
1864                 kfree(session->password);
1865                 session->password = kstrdup(buf, GFP_KERNEL);
1866                 if (!session->password)
1867                         return -ENOMEM;
1868                 break;
1869         case ISCSI_PARAM_PASSWORD_IN:
1870                 kfree(session->password_in);
1871                 session->password_in = kstrdup(buf, GFP_KERNEL);
1872                 if (!session->password_in)
1873                         return -ENOMEM;
1874                 break;
1875         case ISCSI_PARAM_TARGET_NAME:
1876                 /* this should not change between logins */
1877                 if (session->targetname)
1878                         break;
1879
1880                 session->targetname = kstrdup(buf, GFP_KERNEL);
1881                 if (!session->targetname)
1882                         return -ENOMEM;
1883                 break;
1884         case ISCSI_PARAM_TPGT:
1885                 sscanf(buf, "%d", &session->tpgt);
1886                 break;
1887         case ISCSI_PARAM_PERSISTENT_PORT:
1888                 sscanf(buf, "%d", &conn->persistent_port);
1889                 break;
1890         case ISCSI_PARAM_PERSISTENT_ADDRESS:
1891                 /*
1892                  * this is the address returned in discovery so it should
1893                  * not change between logins.
1894                  */
1895                 if (conn->persistent_address)
1896                         break;
1897
1898                 conn->persistent_address = kstrdup(buf, GFP_KERNEL);
1899                 if (!conn->persistent_address)
1900                         return -ENOMEM;
1901                 break;
1902         default:
1903                 return -ENOSYS;
1904         }
1905
1906         return 0;
1907 }
1908 EXPORT_SYMBOL_GPL(iscsi_set_param);
1909
1910 int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
1911                             enum iscsi_param param, char *buf)
1912 {
1913         struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
1914         struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
1915         int len;
1916
1917         switch(param) {
1918         case ISCSI_PARAM_INITIAL_R2T_EN:
1919                 len = sprintf(buf, "%d\n", session->initial_r2t_en);
1920                 break;
1921         case ISCSI_PARAM_MAX_R2T:
1922                 len = sprintf(buf, "%hu\n", session->max_r2t);
1923                 break;
1924         case ISCSI_PARAM_IMM_DATA_EN:
1925                 len = sprintf(buf, "%d\n", session->imm_data_en);
1926                 break;
1927         case ISCSI_PARAM_FIRST_BURST:
1928                 len = sprintf(buf, "%u\n", session->first_burst);
1929                 break;
1930         case ISCSI_PARAM_MAX_BURST:
1931                 len = sprintf(buf, "%u\n", session->max_burst);
1932                 break;
1933         case ISCSI_PARAM_PDU_INORDER_EN:
1934                 len = sprintf(buf, "%d\n", session->pdu_inorder_en);
1935                 break;
1936         case ISCSI_PARAM_DATASEQ_INORDER_EN:
1937                 len = sprintf(buf, "%d\n", session->dataseq_inorder_en);
1938                 break;
1939         case ISCSI_PARAM_ERL:
1940                 len = sprintf(buf, "%d\n", session->erl);
1941                 break;
1942         case ISCSI_PARAM_TARGET_NAME:
1943                 len = sprintf(buf, "%s\n", session->targetname);
1944                 break;
1945         case ISCSI_PARAM_TPGT:
1946                 len = sprintf(buf, "%d\n", session->tpgt);
1947                 break;
1948         case ISCSI_PARAM_USERNAME:
1949                 len = sprintf(buf, "%s\n", session->username);
1950                 break;
1951         case ISCSI_PARAM_USERNAME_IN:
1952                 len = sprintf(buf, "%s\n", session->username_in);
1953                 break;
1954         case ISCSI_PARAM_PASSWORD:
1955                 len = sprintf(buf, "%s\n", session->password);
1956                 break;
1957         case ISCSI_PARAM_PASSWORD_IN:
1958                 len = sprintf(buf, "%s\n", session->password_in);
1959                 break;
1960         default:
1961                 return -ENOSYS;
1962         }
1963
1964         return len;
1965 }
1966 EXPORT_SYMBOL_GPL(iscsi_session_get_param);
1967
1968 int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
1969                          enum iscsi_param param, char *buf)
1970 {
1971         struct iscsi_conn *conn = cls_conn->dd_data;
1972         int len;
1973
1974         switch(param) {
1975         case ISCSI_PARAM_MAX_RECV_DLENGTH:
1976                 len = sprintf(buf, "%u\n", conn->max_recv_dlength);
1977                 break;
1978         case ISCSI_PARAM_MAX_XMIT_DLENGTH:
1979                 len = sprintf(buf, "%u\n", conn->max_xmit_dlength);
1980                 break;
1981         case ISCSI_PARAM_HDRDGST_EN:
1982                 len = sprintf(buf, "%d\n", conn->hdrdgst_en);
1983                 break;
1984         case ISCSI_PARAM_DATADGST_EN:
1985                 len = sprintf(buf, "%d\n", conn->datadgst_en);
1986                 break;
1987         case ISCSI_PARAM_IFMARKER_EN:
1988                 len = sprintf(buf, "%d\n", conn->ifmarker_en);
1989                 break;
1990         case ISCSI_PARAM_OFMARKER_EN:
1991                 len = sprintf(buf, "%d\n", conn->ofmarker_en);
1992                 break;
1993         case ISCSI_PARAM_EXP_STATSN:
1994                 len = sprintf(buf, "%u\n", conn->exp_statsn);
1995                 break;
1996         case ISCSI_PARAM_PERSISTENT_PORT:
1997                 len = sprintf(buf, "%d\n", conn->persistent_port);
1998                 break;
1999         case ISCSI_PARAM_PERSISTENT_ADDRESS:
2000                 len = sprintf(buf, "%s\n", conn->persistent_address);
2001                 break;
2002         default:
2003                 return -ENOSYS;
2004         }
2005
2006         return len;
2007 }
2008 EXPORT_SYMBOL_GPL(iscsi_conn_get_param);
2009
2010 int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2011                          char *buf)
2012 {
2013         struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
2014         int len;
2015
2016         switch (param) {
2017         case ISCSI_HOST_PARAM_HWADDRESS:
2018                 if (!session->hwaddress)
2019                         len = sprintf(buf, "%s\n", "default");
2020                 else
2021                         len = sprintf(buf, "%s\n", session->hwaddress);
2022                 break;
2023         case ISCSI_HOST_PARAM_INITIATOR_NAME:
2024                 if (!session->initiatorname)
2025                         len = sprintf(buf, "%s\n", "unknown");
2026                 else
2027                         len = sprintf(buf, "%s\n", session->initiatorname);
2028                 break;
2029
2030         default:
2031                 return -ENOSYS;
2032         }
2033
2034         return len;
2035 }
2036 EXPORT_SYMBOL_GPL(iscsi_host_get_param);
2037
2038 int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2039                          char *buf, int buflen)
2040 {
2041         struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
2042
2043         switch (param) {
2044         case ISCSI_HOST_PARAM_HWADDRESS:
2045                 if (!session->hwaddress)
2046                         session->hwaddress = kstrdup(buf, GFP_KERNEL);
2047                 break;
2048         case ISCSI_HOST_PARAM_INITIATOR_NAME:
2049                 if (!session->initiatorname)
2050                         session->initiatorname = kstrdup(buf, GFP_KERNEL);
2051                 break;
2052         default:
2053                 return -ENOSYS;
2054         }
2055
2056         return 0;
2057 }
2058 EXPORT_SYMBOL_GPL(iscsi_host_set_param);
2059
2060 MODULE_AUTHOR("Mike Christie");
2061 MODULE_DESCRIPTION("iSCSI library functions");
2062 MODULE_LICENSE("GPL");