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1 | /* | |
2 | * iSCSI lib functions | |
3 | * | |
4 | * Copyright (C) 2006 Red Hat, Inc. All rights reserved. | |
5 | * Copyright (C) 2004 - 2006 Mike Christie | |
6 | * Copyright (C) 2004 - 2005 Dmitry Yusupov | |
7 | * Copyright (C) 2004 - 2005 Alex Aizman | |
8 | * maintained by open-iscsi@googlegroups.com | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
23 | */ | |
24 | #include <linux/types.h> | |
25 | #include <linux/kfifo.h> | |
26 | #include <linux/delay.h> | |
27 | #include <linux/log2.h> | |
28 | #include <asm/unaligned.h> | |
29 | #include <net/tcp.h> | |
30 | #include <scsi/scsi_cmnd.h> | |
31 | #include <scsi/scsi_device.h> | |
32 | #include <scsi/scsi_eh.h> | |
33 | #include <scsi/scsi_tcq.h> | |
34 | #include <scsi/scsi_host.h> | |
35 | #include <scsi/scsi.h> | |
36 | #include <scsi/iscsi_proto.h> | |
37 | #include <scsi/scsi_transport.h> | |
38 | #include <scsi/scsi_transport_iscsi.h> | |
39 | #include <scsi/libiscsi.h> | |
40 | ||
41 | /* Serial Number Arithmetic, 32 bits, less than, RFC1982 */ | |
42 | #define SNA32_CHECK 2147483648UL | |
43 | ||
44 | static int iscsi_sna_lt(u32 n1, u32 n2) | |
45 | { | |
46 | return n1 != n2 && ((n1 < n2 && (n2 - n1 < SNA32_CHECK)) || | |
47 | (n1 > n2 && (n2 - n1 < SNA32_CHECK))); | |
48 | } | |
49 | ||
50 | /* Serial Number Arithmetic, 32 bits, less than, RFC1982 */ | |
51 | static int iscsi_sna_lte(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 | void | |
58 | iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr) | |
59 | { | |
60 | uint32_t max_cmdsn = be32_to_cpu(hdr->max_cmdsn); | |
61 | uint32_t exp_cmdsn = be32_to_cpu(hdr->exp_cmdsn); | |
62 | ||
63 | /* | |
64 | * standard specifies this check for when to update expected and | |
65 | * max sequence numbers | |
66 | */ | |
67 | if (iscsi_sna_lt(max_cmdsn, exp_cmdsn - 1)) | |
68 | return; | |
69 | ||
70 | if (exp_cmdsn != session->exp_cmdsn && | |
71 | !iscsi_sna_lt(exp_cmdsn, session->exp_cmdsn)) | |
72 | session->exp_cmdsn = exp_cmdsn; | |
73 | ||
74 | if (max_cmdsn != session->max_cmdsn && | |
75 | !iscsi_sna_lt(max_cmdsn, session->max_cmdsn)) { | |
76 | session->max_cmdsn = max_cmdsn; | |
77 | /* | |
78 | * if the window closed with IO queued, then kick the | |
79 | * xmit thread | |
80 | */ | |
81 | if (!list_empty(&session->leadconn->xmitqueue) || | |
82 | !list_empty(&session->leadconn->mgmtqueue)) { | |
83 | if (!(session->tt->caps & CAP_DATA_PATH_OFFLOAD)) | |
84 | scsi_queue_work(session->host, | |
85 | &session->leadconn->xmitwork); | |
86 | } | |
87 | } | |
88 | } | |
89 | EXPORT_SYMBOL_GPL(iscsi_update_cmdsn); | |
90 | ||
91 | void iscsi_prep_unsolicit_data_pdu(struct iscsi_task *task, | |
92 | struct iscsi_data *hdr) | |
93 | { | |
94 | struct iscsi_conn *conn = task->conn; | |
95 | ||
96 | memset(hdr, 0, sizeof(struct iscsi_data)); | |
97 | hdr->ttt = cpu_to_be32(ISCSI_RESERVED_TAG); | |
98 | hdr->datasn = cpu_to_be32(task->unsol_datasn); | |
99 | task->unsol_datasn++; | |
100 | hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; | |
101 | memcpy(hdr->lun, task->hdr->lun, sizeof(hdr->lun)); | |
102 | ||
103 | hdr->itt = task->hdr->itt; | |
104 | hdr->exp_statsn = cpu_to_be32(conn->exp_statsn); | |
105 | hdr->offset = cpu_to_be32(task->unsol_offset); | |
106 | ||
107 | if (task->unsol_count > conn->max_xmit_dlength) { | |
108 | hton24(hdr->dlength, conn->max_xmit_dlength); | |
109 | task->data_count = conn->max_xmit_dlength; | |
110 | task->unsol_offset += task->data_count; | |
111 | hdr->flags = 0; | |
112 | } else { | |
113 | hton24(hdr->dlength, task->unsol_count); | |
114 | task->data_count = task->unsol_count; | |
115 | hdr->flags = ISCSI_FLAG_CMD_FINAL; | |
116 | } | |
117 | } | |
118 | EXPORT_SYMBOL_GPL(iscsi_prep_unsolicit_data_pdu); | |
119 | ||
120 | static int iscsi_add_hdr(struct iscsi_task *task, unsigned len) | |
121 | { | |
122 | unsigned exp_len = task->hdr_len + len; | |
123 | ||
124 | if (exp_len > task->hdr_max) { | |
125 | WARN_ON(1); | |
126 | return -EINVAL; | |
127 | } | |
128 | ||
129 | WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */ | |
130 | task->hdr_len = exp_len; | |
131 | return 0; | |
132 | } | |
133 | ||
134 | /* | |
135 | * make an extended cdb AHS | |
136 | */ | |
137 | static int iscsi_prep_ecdb_ahs(struct iscsi_task *task) | |
138 | { | |
139 | struct scsi_cmnd *cmd = task->sc; | |
140 | unsigned rlen, pad_len; | |
141 | unsigned short ahslength; | |
142 | struct iscsi_ecdb_ahdr *ecdb_ahdr; | |
143 | int rc; | |
144 | ||
145 | ecdb_ahdr = iscsi_next_hdr(task); | |
146 | rlen = cmd->cmd_len - ISCSI_CDB_SIZE; | |
147 | ||
148 | BUG_ON(rlen > sizeof(ecdb_ahdr->ecdb)); | |
149 | ahslength = rlen + sizeof(ecdb_ahdr->reserved); | |
150 | ||
151 | pad_len = iscsi_padding(rlen); | |
152 | ||
153 | rc = iscsi_add_hdr(task, sizeof(ecdb_ahdr->ahslength) + | |
154 | sizeof(ecdb_ahdr->ahstype) + ahslength + pad_len); | |
155 | if (rc) | |
156 | return rc; | |
157 | ||
158 | if (pad_len) | |
159 | memset(&ecdb_ahdr->ecdb[rlen], 0, pad_len); | |
160 | ||
161 | ecdb_ahdr->ahslength = cpu_to_be16(ahslength); | |
162 | ecdb_ahdr->ahstype = ISCSI_AHSTYPE_CDB; | |
163 | ecdb_ahdr->reserved = 0; | |
164 | memcpy(ecdb_ahdr->ecdb, cmd->cmnd + ISCSI_CDB_SIZE, rlen); | |
165 | ||
166 | debug_scsi("iscsi_prep_ecdb_ahs: varlen_cdb_len %d " | |
167 | "rlen %d pad_len %d ahs_length %d iscsi_headers_size %u\n", | |
168 | cmd->cmd_len, rlen, pad_len, ahslength, task->hdr_len); | |
169 | ||
170 | return 0; | |
171 | } | |
172 | ||
173 | static int iscsi_prep_bidi_ahs(struct iscsi_task *task) | |
174 | { | |
175 | struct scsi_cmnd *sc = task->sc; | |
176 | struct iscsi_rlength_ahdr *rlen_ahdr; | |
177 | int rc; | |
178 | ||
179 | rlen_ahdr = iscsi_next_hdr(task); | |
180 | rc = iscsi_add_hdr(task, sizeof(*rlen_ahdr)); | |
181 | if (rc) | |
182 | return rc; | |
183 | ||
184 | rlen_ahdr->ahslength = | |
185 | cpu_to_be16(sizeof(rlen_ahdr->read_length) + | |
186 | sizeof(rlen_ahdr->reserved)); | |
187 | rlen_ahdr->ahstype = ISCSI_AHSTYPE_RLENGTH; | |
188 | rlen_ahdr->reserved = 0; | |
189 | rlen_ahdr->read_length = cpu_to_be32(scsi_in(sc)->length); | |
190 | ||
191 | debug_scsi("bidi-in rlen_ahdr->read_length(%d) " | |
192 | "rlen_ahdr->ahslength(%d)\n", | |
193 | be32_to_cpu(rlen_ahdr->read_length), | |
194 | be16_to_cpu(rlen_ahdr->ahslength)); | |
195 | return 0; | |
196 | } | |
197 | ||
198 | /** | |
199 | * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu | |
200 | * @task: iscsi task | |
201 | * | |
202 | * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set | |
203 | * fields like dlength or final based on how much data it sends | |
204 | */ | |
205 | static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task) | |
206 | { | |
207 | struct iscsi_conn *conn = task->conn; | |
208 | struct iscsi_session *session = conn->session; | |
209 | struct iscsi_cmd *hdr = task->hdr; | |
210 | struct scsi_cmnd *sc = task->sc; | |
211 | unsigned hdrlength, cmd_len; | |
212 | int rc; | |
213 | ||
214 | task->hdr_len = 0; | |
215 | rc = iscsi_add_hdr(task, sizeof(*hdr)); | |
216 | if (rc) | |
217 | return rc; | |
218 | hdr->opcode = ISCSI_OP_SCSI_CMD; | |
219 | hdr->flags = ISCSI_ATTR_SIMPLE; | |
220 | int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun); | |
221 | hdr->itt = build_itt(task->itt, session->age); | |
222 | hdr->cmdsn = cpu_to_be32(session->cmdsn); | |
223 | session->cmdsn++; | |
224 | hdr->exp_statsn = cpu_to_be32(conn->exp_statsn); | |
225 | cmd_len = sc->cmd_len; | |
226 | if (cmd_len < ISCSI_CDB_SIZE) | |
227 | memset(&hdr->cdb[cmd_len], 0, ISCSI_CDB_SIZE - cmd_len); | |
228 | else if (cmd_len > ISCSI_CDB_SIZE) { | |
229 | rc = iscsi_prep_ecdb_ahs(task); | |
230 | if (rc) | |
231 | return rc; | |
232 | cmd_len = ISCSI_CDB_SIZE; | |
233 | } | |
234 | memcpy(hdr->cdb, sc->cmnd, cmd_len); | |
235 | ||
236 | task->imm_count = 0; | |
237 | if (scsi_bidi_cmnd(sc)) { | |
238 | hdr->flags |= ISCSI_FLAG_CMD_READ; | |
239 | rc = iscsi_prep_bidi_ahs(task); | |
240 | if (rc) | |
241 | return rc; | |
242 | } | |
243 | if (sc->sc_data_direction == DMA_TO_DEVICE) { | |
244 | unsigned out_len = scsi_out(sc)->length; | |
245 | hdr->data_length = cpu_to_be32(out_len); | |
246 | hdr->flags |= ISCSI_FLAG_CMD_WRITE; | |
247 | /* | |
248 | * Write counters: | |
249 | * | |
250 | * imm_count bytes to be sent right after | |
251 | * SCSI PDU Header | |
252 | * | |
253 | * unsol_count bytes(as Data-Out) to be sent | |
254 | * without R2T ack right after | |
255 | * immediate data | |
256 | * | |
257 | * r2t_data_count bytes to be sent via R2T ack's | |
258 | * | |
259 | * pad_count bytes to be sent as zero-padding | |
260 | */ | |
261 | task->unsol_count = 0; | |
262 | task->unsol_offset = 0; | |
263 | task->unsol_datasn = 0; | |
264 | ||
265 | if (session->imm_data_en) { | |
266 | if (out_len >= session->first_burst) | |
267 | task->imm_count = min(session->first_burst, | |
268 | conn->max_xmit_dlength); | |
269 | else | |
270 | task->imm_count = min(out_len, | |
271 | conn->max_xmit_dlength); | |
272 | hton24(hdr->dlength, task->imm_count); | |
273 | } else | |
274 | zero_data(hdr->dlength); | |
275 | ||
276 | if (!session->initial_r2t_en) { | |
277 | task->unsol_count = min(session->first_burst, out_len) | |
278 | - task->imm_count; | |
279 | task->unsol_offset = task->imm_count; | |
280 | } | |
281 | ||
282 | if (!task->unsol_count) | |
283 | /* No unsolicit Data-Out's */ | |
284 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
285 | } else { | |
286 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
287 | zero_data(hdr->dlength); | |
288 | hdr->data_length = cpu_to_be32(scsi_in(sc)->length); | |
289 | ||
290 | if (sc->sc_data_direction == DMA_FROM_DEVICE) | |
291 | hdr->flags |= ISCSI_FLAG_CMD_READ; | |
292 | } | |
293 | ||
294 | /* calculate size of additional header segments (AHSs) */ | |
295 | hdrlength = task->hdr_len - sizeof(*hdr); | |
296 | ||
297 | WARN_ON(hdrlength & (ISCSI_PAD_LEN-1)); | |
298 | hdrlength /= ISCSI_PAD_LEN; | |
299 | ||
300 | WARN_ON(hdrlength >= 256); | |
301 | hdr->hlength = hdrlength & 0xFF; | |
302 | ||
303 | if (conn->session->tt->init_task && | |
304 | conn->session->tt->init_task(task)) | |
305 | return -EIO; | |
306 | ||
307 | task->state = ISCSI_TASK_RUNNING; | |
308 | list_move_tail(&task->running, &conn->run_list); | |
309 | ||
310 | conn->scsicmd_pdus_cnt++; | |
311 | debug_scsi("iscsi prep [%s cid %d sc %p cdb 0x%x itt 0x%x len %d " | |
312 | "bidi_len %d cmdsn %d win %d]\n", scsi_bidi_cmnd(sc) ? | |
313 | "bidirectional" : sc->sc_data_direction == DMA_TO_DEVICE ? | |
314 | "write" : "read", conn->id, sc, sc->cmnd[0], task->itt, | |
315 | scsi_bufflen(sc), | |
316 | scsi_bidi_cmnd(sc) ? scsi_in(sc)->length : 0, | |
317 | session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1); | |
318 | return 0; | |
319 | } | |
320 | ||
321 | /** | |
322 | * iscsi_complete_command - finish a task | |
323 | * @task: iscsi cmd task | |
324 | * | |
325 | * Must be called with session lock. | |
326 | * This function returns the scsi command to scsi-ml or cleans | |
327 | * up mgmt tasks then returns the task to the pool. | |
328 | */ | |
329 | static void iscsi_complete_command(struct iscsi_task *task) | |
330 | { | |
331 | struct iscsi_conn *conn = task->conn; | |
332 | struct iscsi_session *session = conn->session; | |
333 | struct scsi_cmnd *sc = task->sc; | |
334 | ||
335 | list_del_init(&task->running); | |
336 | task->state = ISCSI_TASK_COMPLETED; | |
337 | task->sc = NULL; | |
338 | ||
339 | if (conn->task == task) | |
340 | conn->task = NULL; | |
341 | /* | |
342 | * login task is preallocated so do not free | |
343 | */ | |
344 | if (conn->login_task == task) | |
345 | return; | |
346 | ||
347 | __kfifo_put(session->cmdpool.queue, (void*)&task, sizeof(void*)); | |
348 | ||
349 | if (conn->ping_task == task) | |
350 | conn->ping_task = NULL; | |
351 | ||
352 | if (sc) { | |
353 | task->sc = NULL; | |
354 | /* SCSI eh reuses commands to verify us */ | |
355 | sc->SCp.ptr = NULL; | |
356 | /* | |
357 | * queue command may call this to free the task, but | |
358 | * not have setup the sc callback | |
359 | */ | |
360 | if (sc->scsi_done) | |
361 | sc->scsi_done(sc); | |
362 | } | |
363 | } | |
364 | ||
365 | static void __iscsi_get_task(struct iscsi_task *task) | |
366 | { | |
367 | atomic_inc(&task->refcount); | |
368 | } | |
369 | ||
370 | static void __iscsi_put_task(struct iscsi_task *task) | |
371 | { | |
372 | if (atomic_dec_and_test(&task->refcount)) | |
373 | iscsi_complete_command(task); | |
374 | } | |
375 | ||
376 | void iscsi_put_task(struct iscsi_task *task) | |
377 | { | |
378 | struct iscsi_session *session = task->conn->session; | |
379 | ||
380 | spin_lock_bh(&session->lock); | |
381 | __iscsi_put_task(task); | |
382 | spin_unlock_bh(&session->lock); | |
383 | } | |
384 | EXPORT_SYMBOL_GPL(iscsi_put_task); | |
385 | ||
386 | /* | |
387 | * session lock must be held | |
388 | */ | |
389 | static void fail_command(struct iscsi_conn *conn, struct iscsi_task *task, | |
390 | int err) | |
391 | { | |
392 | struct scsi_cmnd *sc; | |
393 | ||
394 | sc = task->sc; | |
395 | if (!sc) | |
396 | return; | |
397 | ||
398 | if (task->state == ISCSI_TASK_PENDING) | |
399 | /* | |
400 | * cmd never made it to the xmit thread, so we should not count | |
401 | * the cmd in the sequencing | |
402 | */ | |
403 | conn->session->queued_cmdsn--; | |
404 | else | |
405 | conn->session->tt->cleanup_task(conn, task); | |
406 | ||
407 | sc->result = err; | |
408 | ||
409 | if (!scsi_bidi_cmnd(sc)) | |
410 | scsi_set_resid(sc, scsi_bufflen(sc)); | |
411 | else { | |
412 | scsi_out(sc)->resid = scsi_out(sc)->length; | |
413 | scsi_in(sc)->resid = scsi_in(sc)->length; | |
414 | } | |
415 | ||
416 | if (conn->task == task) | |
417 | conn->task = NULL; | |
418 | /* release ref from queuecommand */ | |
419 | __iscsi_put_task(task); | |
420 | } | |
421 | ||
422 | static int iscsi_prep_mgmt_task(struct iscsi_conn *conn, | |
423 | struct iscsi_task *task) | |
424 | { | |
425 | struct iscsi_session *session = conn->session; | |
426 | struct iscsi_hdr *hdr = (struct iscsi_hdr *)task->hdr; | |
427 | struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr; | |
428 | ||
429 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) | |
430 | return -ENOTCONN; | |
431 | ||
432 | if (hdr->opcode != (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) && | |
433 | hdr->opcode != (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE)) | |
434 | nop->exp_statsn = cpu_to_be32(conn->exp_statsn); | |
435 | /* | |
436 | * pre-format CmdSN for outgoing PDU. | |
437 | */ | |
438 | nop->cmdsn = cpu_to_be32(session->cmdsn); | |
439 | if (hdr->itt != RESERVED_ITT) { | |
440 | hdr->itt = build_itt(task->itt, session->age); | |
441 | /* | |
442 | * TODO: We always use immediate, so we never hit this. | |
443 | * If we start to send tmfs or nops as non-immediate then | |
444 | * we should start checking the cmdsn numbers for mgmt tasks. | |
445 | */ | |
446 | if (conn->c_stage == ISCSI_CONN_STARTED && | |
447 | !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { | |
448 | session->queued_cmdsn++; | |
449 | session->cmdsn++; | |
450 | } | |
451 | } | |
452 | ||
453 | if (session->tt->init_task) | |
454 | session->tt->init_task(task); | |
455 | ||
456 | if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT) | |
457 | session->state = ISCSI_STATE_LOGGING_OUT; | |
458 | ||
459 | list_move_tail(&task->running, &conn->mgmt_run_list); | |
460 | debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n", | |
461 | hdr->opcode & ISCSI_OPCODE_MASK, hdr->itt, | |
462 | task->data_count); | |
463 | return 0; | |
464 | } | |
465 | ||
466 | static struct iscsi_task * | |
467 | __iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
468 | char *data, uint32_t data_size) | |
469 | { | |
470 | struct iscsi_session *session = conn->session; | |
471 | struct iscsi_task *task; | |
472 | ||
473 | if (session->state == ISCSI_STATE_TERMINATE) | |
474 | return NULL; | |
475 | ||
476 | if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) || | |
477 | hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE)) | |
478 | /* | |
479 | * Login and Text are sent serially, in | |
480 | * request-followed-by-response sequence. | |
481 | * Same task can be used. Same ITT must be used. | |
482 | * Note that login_task is preallocated at conn_create(). | |
483 | */ | |
484 | task = conn->login_task; | |
485 | else { | |
486 | BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE); | |
487 | BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED); | |
488 | ||
489 | if (!__kfifo_get(session->cmdpool.queue, | |
490 | (void*)&task, sizeof(void*))) | |
491 | return NULL; | |
492 | ||
493 | if ((hdr->opcode == (ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE)) && | |
494 | hdr->ttt == RESERVED_ITT) { | |
495 | conn->ping_task = task; | |
496 | conn->last_ping = jiffies; | |
497 | } | |
498 | } | |
499 | /* | |
500 | * released in complete pdu for task we expect a response for, and | |
501 | * released by the lld when it has transmitted the task for | |
502 | * pdus we do not expect a response for. | |
503 | */ | |
504 | atomic_set(&task->refcount, 1); | |
505 | task->conn = conn; | |
506 | task->sc = NULL; | |
507 | ||
508 | if (data_size) { | |
509 | memcpy(task->data, data, data_size); | |
510 | task->data_count = data_size; | |
511 | } else | |
512 | task->data_count = 0; | |
513 | ||
514 | memcpy(task->hdr, hdr, sizeof(struct iscsi_hdr)); | |
515 | INIT_LIST_HEAD(&task->running); | |
516 | list_add_tail(&task->running, &conn->mgmtqueue); | |
517 | ||
518 | if (session->tt->caps & CAP_DATA_PATH_OFFLOAD) { | |
519 | if (iscsi_prep_mgmt_task(conn, task)) { | |
520 | __iscsi_put_task(task); | |
521 | return NULL; | |
522 | } | |
523 | ||
524 | if (session->tt->xmit_task(task)) | |
525 | task = NULL; | |
526 | ||
527 | } else | |
528 | scsi_queue_work(conn->session->host, &conn->xmitwork); | |
529 | ||
530 | return task; | |
531 | } | |
532 | ||
533 | int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr, | |
534 | char *data, uint32_t data_size) | |
535 | { | |
536 | struct iscsi_conn *conn = cls_conn->dd_data; | |
537 | struct iscsi_session *session = conn->session; | |
538 | int err = 0; | |
539 | ||
540 | spin_lock_bh(&session->lock); | |
541 | if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size)) | |
542 | err = -EPERM; | |
543 | spin_unlock_bh(&session->lock); | |
544 | return err; | |
545 | } | |
546 | EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu); | |
547 | ||
548 | /** | |
549 | * iscsi_cmd_rsp - SCSI Command Response processing | |
550 | * @conn: iscsi connection | |
551 | * @hdr: iscsi header | |
552 | * @task: scsi command task | |
553 | * @data: cmd data buffer | |
554 | * @datalen: len of buffer | |
555 | * | |
556 | * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and | |
557 | * then completes the command and task. | |
558 | **/ | |
559 | static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
560 | struct iscsi_task *task, char *data, | |
561 | int datalen) | |
562 | { | |
563 | struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)hdr; | |
564 | struct iscsi_session *session = conn->session; | |
565 | struct scsi_cmnd *sc = task->sc; | |
566 | ||
567 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr); | |
568 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; | |
569 | ||
570 | sc->result = (DID_OK << 16) | rhdr->cmd_status; | |
571 | ||
572 | if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) { | |
573 | sc->result = DID_ERROR << 16; | |
574 | goto out; | |
575 | } | |
576 | ||
577 | if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) { | |
578 | uint16_t senselen; | |
579 | ||
580 | if (datalen < 2) { | |
581 | invalid_datalen: | |
582 | iscsi_conn_printk(KERN_ERR, conn, | |
583 | "Got CHECK_CONDITION but invalid data " | |
584 | "buffer size of %d\n", datalen); | |
585 | sc->result = DID_BAD_TARGET << 16; | |
586 | goto out; | |
587 | } | |
588 | ||
589 | senselen = be16_to_cpu(get_unaligned((__be16 *) data)); | |
590 | if (datalen < senselen) | |
591 | goto invalid_datalen; | |
592 | ||
593 | memcpy(sc->sense_buffer, data + 2, | |
594 | min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE)); | |
595 | debug_scsi("copied %d bytes of sense\n", | |
596 | min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE)); | |
597 | } | |
598 | ||
599 | if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW | | |
600 | ISCSI_FLAG_CMD_BIDI_OVERFLOW)) { | |
601 | int res_count = be32_to_cpu(rhdr->bi_residual_count); | |
602 | ||
603 | if (scsi_bidi_cmnd(sc) && res_count > 0 && | |
604 | (rhdr->flags & ISCSI_FLAG_CMD_BIDI_OVERFLOW || | |
605 | res_count <= scsi_in(sc)->length)) | |
606 | scsi_in(sc)->resid = res_count; | |
607 | else | |
608 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
609 | } | |
610 | ||
611 | if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW | | |
612 | ISCSI_FLAG_CMD_OVERFLOW)) { | |
613 | int res_count = be32_to_cpu(rhdr->residual_count); | |
614 | ||
615 | if (res_count > 0 && | |
616 | (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || | |
617 | res_count <= scsi_bufflen(sc))) | |
618 | /* write side for bidi or uni-io set_resid */ | |
619 | scsi_set_resid(sc, res_count); | |
620 | else | |
621 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
622 | } | |
623 | out: | |
624 | debug_scsi("done [sc %lx res %d itt 0x%x]\n", | |
625 | (long)sc, sc->result, task->itt); | |
626 | conn->scsirsp_pdus_cnt++; | |
627 | ||
628 | __iscsi_put_task(task); | |
629 | } | |
630 | ||
631 | static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr) | |
632 | { | |
633 | struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr; | |
634 | ||
635 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
636 | conn->tmfrsp_pdus_cnt++; | |
637 | ||
638 | if (conn->tmf_state != TMF_QUEUED) | |
639 | return; | |
640 | ||
641 | if (tmf->response == ISCSI_TMF_RSP_COMPLETE) | |
642 | conn->tmf_state = TMF_SUCCESS; | |
643 | else if (tmf->response == ISCSI_TMF_RSP_NO_TASK) | |
644 | conn->tmf_state = TMF_NOT_FOUND; | |
645 | else | |
646 | conn->tmf_state = TMF_FAILED; | |
647 | wake_up(&conn->ehwait); | |
648 | } | |
649 | ||
650 | static void iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr) | |
651 | { | |
652 | struct iscsi_nopout hdr; | |
653 | struct iscsi_task *task; | |
654 | ||
655 | if (!rhdr && conn->ping_task) | |
656 | return; | |
657 | ||
658 | memset(&hdr, 0, sizeof(struct iscsi_nopout)); | |
659 | hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE; | |
660 | hdr.flags = ISCSI_FLAG_CMD_FINAL; | |
661 | ||
662 | if (rhdr) { | |
663 | memcpy(hdr.lun, rhdr->lun, 8); | |
664 | hdr.ttt = rhdr->ttt; | |
665 | hdr.itt = RESERVED_ITT; | |
666 | } else | |
667 | hdr.ttt = RESERVED_ITT; | |
668 | ||
669 | task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0); | |
670 | if (!task) | |
671 | iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n"); | |
672 | } | |
673 | ||
674 | static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
675 | char *data, int datalen) | |
676 | { | |
677 | struct iscsi_reject *reject = (struct iscsi_reject *)hdr; | |
678 | struct iscsi_hdr rejected_pdu; | |
679 | uint32_t itt; | |
680 | ||
681 | conn->exp_statsn = be32_to_cpu(reject->statsn) + 1; | |
682 | ||
683 | if (reject->reason == ISCSI_REASON_DATA_DIGEST_ERROR) { | |
684 | if (ntoh24(reject->dlength) > datalen) | |
685 | return ISCSI_ERR_PROTO; | |
686 | ||
687 | if (ntoh24(reject->dlength) >= sizeof(struct iscsi_hdr)) { | |
688 | memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr)); | |
689 | itt = get_itt(rejected_pdu.itt); | |
690 | iscsi_conn_printk(KERN_ERR, conn, | |
691 | "itt 0x%x had pdu (op 0x%x) rejected " | |
692 | "due to DataDigest error.\n", itt, | |
693 | rejected_pdu.opcode); | |
694 | } | |
695 | } | |
696 | return 0; | |
697 | } | |
698 | ||
699 | /** | |
700 | * __iscsi_complete_pdu - complete pdu | |
701 | * @conn: iscsi conn | |
702 | * @hdr: iscsi header | |
703 | * @data: data buffer | |
704 | * @datalen: len of data buffer | |
705 | * | |
706 | * Completes pdu processing by freeing any resources allocated at | |
707 | * queuecommand or send generic. session lock must be held and verify | |
708 | * itt must have been called. | |
709 | */ | |
710 | static int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
711 | char *data, int datalen) | |
712 | { | |
713 | struct iscsi_session *session = conn->session; | |
714 | int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0; | |
715 | struct iscsi_task *task; | |
716 | uint32_t itt; | |
717 | ||
718 | conn->last_recv = jiffies; | |
719 | rc = iscsi_verify_itt(conn, hdr->itt); | |
720 | if (rc) | |
721 | return rc; | |
722 | ||
723 | if (hdr->itt != RESERVED_ITT) | |
724 | itt = get_itt(hdr->itt); | |
725 | else | |
726 | itt = ~0U; | |
727 | ||
728 | debug_scsi("[op 0x%x cid %d itt 0x%x len %d]\n", | |
729 | opcode, conn->id, itt, datalen); | |
730 | ||
731 | if (itt == ~0U) { | |
732 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
733 | ||
734 | switch(opcode) { | |
735 | case ISCSI_OP_NOOP_IN: | |
736 | if (datalen) { | |
737 | rc = ISCSI_ERR_PROTO; | |
738 | break; | |
739 | } | |
740 | ||
741 | if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG)) | |
742 | break; | |
743 | ||
744 | iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr); | |
745 | break; | |
746 | case ISCSI_OP_REJECT: | |
747 | rc = iscsi_handle_reject(conn, hdr, data, datalen); | |
748 | break; | |
749 | case ISCSI_OP_ASYNC_EVENT: | |
750 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
751 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) | |
752 | rc = ISCSI_ERR_CONN_FAILED; | |
753 | break; | |
754 | default: | |
755 | rc = ISCSI_ERR_BAD_OPCODE; | |
756 | break; | |
757 | } | |
758 | goto out; | |
759 | } | |
760 | ||
761 | task = session->cmds[itt]; | |
762 | switch(opcode) { | |
763 | case ISCSI_OP_SCSI_CMD_RSP: | |
764 | if (!task->sc) { | |
765 | rc = ISCSI_ERR_NO_SCSI_CMD; | |
766 | break; | |
767 | } | |
768 | BUG_ON((void*)task != task->sc->SCp.ptr); | |
769 | iscsi_scsi_cmd_rsp(conn, hdr, task, data, datalen); | |
770 | break; | |
771 | case ISCSI_OP_SCSI_DATA_IN: | |
772 | if (!task->sc) { | |
773 | rc = ISCSI_ERR_NO_SCSI_CMD; | |
774 | break; | |
775 | } | |
776 | BUG_ON((void*)task != task->sc->SCp.ptr); | |
777 | if (hdr->flags & ISCSI_FLAG_DATA_STATUS) { | |
778 | conn->scsirsp_pdus_cnt++; | |
779 | iscsi_update_cmdsn(session, | |
780 | (struct iscsi_nopin*) hdr); | |
781 | __iscsi_put_task(task); | |
782 | } | |
783 | break; | |
784 | case ISCSI_OP_R2T: | |
785 | /* LLD handles this for now */ | |
786 | break; | |
787 | case ISCSI_OP_LOGOUT_RSP: | |
788 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
789 | if (datalen) { | |
790 | rc = ISCSI_ERR_PROTO; | |
791 | break; | |
792 | } | |
793 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
794 | goto recv_pdu; | |
795 | case ISCSI_OP_LOGIN_RSP: | |
796 | case ISCSI_OP_TEXT_RSP: | |
797 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
798 | /* | |
799 | * login related PDU's exp_statsn is handled in | |
800 | * userspace | |
801 | */ | |
802 | goto recv_pdu; | |
803 | case ISCSI_OP_SCSI_TMFUNC_RSP: | |
804 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
805 | if (datalen) { | |
806 | rc = ISCSI_ERR_PROTO; | |
807 | break; | |
808 | } | |
809 | ||
810 | iscsi_tmf_rsp(conn, hdr); | |
811 | __iscsi_put_task(task); | |
812 | break; | |
813 | case ISCSI_OP_NOOP_IN: | |
814 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
815 | if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) { | |
816 | rc = ISCSI_ERR_PROTO; | |
817 | break; | |
818 | } | |
819 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
820 | ||
821 | if (conn->ping_task != task) | |
822 | /* | |
823 | * If this is not in response to one of our | |
824 | * nops then it must be from userspace. | |
825 | */ | |
826 | goto recv_pdu; | |
827 | ||
828 | mod_timer(&conn->transport_timer, jiffies + conn->recv_timeout); | |
829 | __iscsi_put_task(task); | |
830 | break; | |
831 | default: | |
832 | rc = ISCSI_ERR_BAD_OPCODE; | |
833 | break; | |
834 | } | |
835 | ||
836 | out: | |
837 | return rc; | |
838 | recv_pdu: | |
839 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) | |
840 | rc = ISCSI_ERR_CONN_FAILED; | |
841 | __iscsi_put_task(task); | |
842 | return rc; | |
843 | } | |
844 | ||
845 | int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
846 | char *data, int datalen) | |
847 | { | |
848 | int rc; | |
849 | ||
850 | spin_lock(&conn->session->lock); | |
851 | rc = __iscsi_complete_pdu(conn, hdr, data, datalen); | |
852 | spin_unlock(&conn->session->lock); | |
853 | return rc; | |
854 | } | |
855 | EXPORT_SYMBOL_GPL(iscsi_complete_pdu); | |
856 | ||
857 | int iscsi_verify_itt(struct iscsi_conn *conn, itt_t itt) | |
858 | { | |
859 | struct iscsi_session *session = conn->session; | |
860 | struct iscsi_task *task; | |
861 | uint32_t i; | |
862 | ||
863 | if (itt == RESERVED_ITT) | |
864 | return 0; | |
865 | ||
866 | if (((__force u32)itt & ISCSI_AGE_MASK) != | |
867 | (session->age << ISCSI_AGE_SHIFT)) { | |
868 | iscsi_conn_printk(KERN_ERR, conn, | |
869 | "received itt %x expected session age (%x)\n", | |
870 | (__force u32)itt, | |
871 | session->age & ISCSI_AGE_MASK); | |
872 | return ISCSI_ERR_BAD_ITT; | |
873 | } | |
874 | ||
875 | i = get_itt(itt); | |
876 | if (i >= session->cmds_max) { | |
877 | iscsi_conn_printk(KERN_ERR, conn, | |
878 | "received invalid itt index %u (max cmds " | |
879 | "%u.\n", i, session->cmds_max); | |
880 | return ISCSI_ERR_BAD_ITT; | |
881 | } | |
882 | ||
883 | task = session->cmds[i]; | |
884 | if (task->sc && task->sc->SCp.phase != session->age) { | |
885 | iscsi_conn_printk(KERN_ERR, conn, | |
886 | "iscsi: task's session age %d, " | |
887 | "expected %d\n", task->sc->SCp.phase, | |
888 | session->age); | |
889 | return ISCSI_ERR_SESSION_FAILED; | |
890 | } | |
891 | return 0; | |
892 | } | |
893 | EXPORT_SYMBOL_GPL(iscsi_verify_itt); | |
894 | ||
895 | struct iscsi_task * | |
896 | iscsi_itt_to_ctask(struct iscsi_conn *conn, itt_t itt) | |
897 | { | |
898 | struct iscsi_session *session = conn->session; | |
899 | struct iscsi_task *task; | |
900 | uint32_t i; | |
901 | ||
902 | if (iscsi_verify_itt(conn, itt)) | |
903 | return NULL; | |
904 | ||
905 | if (itt == RESERVED_ITT) | |
906 | return NULL; | |
907 | ||
908 | i = get_itt(itt); | |
909 | if (i >= session->cmds_max) | |
910 | return NULL; | |
911 | ||
912 | task = session->cmds[i]; | |
913 | if (!task->sc) | |
914 | return NULL; | |
915 | ||
916 | if (task->sc->SCp.phase != session->age) | |
917 | return NULL; | |
918 | ||
919 | return task; | |
920 | } | |
921 | EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask); | |
922 | ||
923 | void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err) | |
924 | { | |
925 | struct iscsi_session *session = conn->session; | |
926 | unsigned long flags; | |
927 | ||
928 | spin_lock_irqsave(&session->lock, flags); | |
929 | if (session->state == ISCSI_STATE_FAILED) { | |
930 | spin_unlock_irqrestore(&session->lock, flags); | |
931 | return; | |
932 | } | |
933 | ||
934 | if (conn->stop_stage == 0) | |
935 | session->state = ISCSI_STATE_FAILED; | |
936 | spin_unlock_irqrestore(&session->lock, flags); | |
937 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
938 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
939 | iscsi_conn_error(conn->cls_conn, err); | |
940 | } | |
941 | EXPORT_SYMBOL_GPL(iscsi_conn_failure); | |
942 | ||
943 | static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn) | |
944 | { | |
945 | struct iscsi_session *session = conn->session; | |
946 | ||
947 | /* | |
948 | * Check for iSCSI window and take care of CmdSN wrap-around | |
949 | */ | |
950 | if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) { | |
951 | debug_scsi("iSCSI CmdSN closed. ExpCmdSn %u MaxCmdSN %u " | |
952 | "CmdSN %u/%u\n", session->exp_cmdsn, | |
953 | session->max_cmdsn, session->cmdsn, | |
954 | session->queued_cmdsn); | |
955 | return -ENOSPC; | |
956 | } | |
957 | return 0; | |
958 | } | |
959 | ||
960 | static int iscsi_xmit_task(struct iscsi_conn *conn) | |
961 | { | |
962 | struct iscsi_task *task = conn->task; | |
963 | int rc; | |
964 | ||
965 | __iscsi_get_task(task); | |
966 | spin_unlock_bh(&conn->session->lock); | |
967 | rc = conn->session->tt->xmit_task(task); | |
968 | spin_lock_bh(&conn->session->lock); | |
969 | __iscsi_put_task(task); | |
970 | if (!rc) | |
971 | /* done with this task */ | |
972 | conn->task = NULL; | |
973 | return rc; | |
974 | } | |
975 | ||
976 | /** | |
977 | * iscsi_requeue_task - requeue task to run from session workqueue | |
978 | * @task: task to requeue | |
979 | * | |
980 | * LLDs that need to run a task from the session workqueue should call | |
981 | * this. The session lock must be held. This should only be called | |
982 | * by software drivers. | |
983 | */ | |
984 | void iscsi_requeue_task(struct iscsi_task *task) | |
985 | { | |
986 | struct iscsi_conn *conn = task->conn; | |
987 | ||
988 | list_move_tail(&task->running, &conn->requeue); | |
989 | scsi_queue_work(conn->session->host, &conn->xmitwork); | |
990 | } | |
991 | EXPORT_SYMBOL_GPL(iscsi_requeue_task); | |
992 | ||
993 | /** | |
994 | * iscsi_data_xmit - xmit any command into the scheduled connection | |
995 | * @conn: iscsi connection | |
996 | * | |
997 | * Notes: | |
998 | * The function can return -EAGAIN in which case the caller must | |
999 | * re-schedule it again later or recover. '0' return code means | |
1000 | * successful xmit. | |
1001 | **/ | |
1002 | static int iscsi_data_xmit(struct iscsi_conn *conn) | |
1003 | { | |
1004 | int rc = 0; | |
1005 | ||
1006 | spin_lock_bh(&conn->session->lock); | |
1007 | if (unlikely(conn->suspend_tx)) { | |
1008 | debug_scsi("conn %d Tx suspended!\n", conn->id); | |
1009 | spin_unlock_bh(&conn->session->lock); | |
1010 | return -ENODATA; | |
1011 | } | |
1012 | ||
1013 | if (conn->task) { | |
1014 | rc = iscsi_xmit_task(conn); | |
1015 | if (rc) | |
1016 | goto again; | |
1017 | } | |
1018 | ||
1019 | /* | |
1020 | * process mgmt pdus like nops before commands since we should | |
1021 | * only have one nop-out as a ping from us and targets should not | |
1022 | * overflow us with nop-ins | |
1023 | */ | |
1024 | check_mgmt: | |
1025 | while (!list_empty(&conn->mgmtqueue)) { | |
1026 | conn->task = list_entry(conn->mgmtqueue.next, | |
1027 | struct iscsi_task, running); | |
1028 | if (iscsi_prep_mgmt_task(conn, conn->task)) { | |
1029 | __iscsi_put_task(conn->task); | |
1030 | conn->task = NULL; | |
1031 | continue; | |
1032 | } | |
1033 | rc = iscsi_xmit_task(conn); | |
1034 | if (rc) | |
1035 | goto again; | |
1036 | } | |
1037 | ||
1038 | /* process pending command queue */ | |
1039 | while (!list_empty(&conn->xmitqueue)) { | |
1040 | if (conn->tmf_state == TMF_QUEUED) | |
1041 | break; | |
1042 | ||
1043 | conn->task = list_entry(conn->xmitqueue.next, | |
1044 | struct iscsi_task, running); | |
1045 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) { | |
1046 | fail_command(conn, conn->task, DID_IMM_RETRY << 16); | |
1047 | continue; | |
1048 | } | |
1049 | if (iscsi_prep_scsi_cmd_pdu(conn->task)) { | |
1050 | fail_command(conn, conn->task, DID_ABORT << 16); | |
1051 | continue; | |
1052 | } | |
1053 | rc = iscsi_xmit_task(conn); | |
1054 | if (rc) | |
1055 | goto again; | |
1056 | /* | |
1057 | * we could continuously get new task requests so | |
1058 | * we need to check the mgmt queue for nops that need to | |
1059 | * be sent to aviod starvation | |
1060 | */ | |
1061 | if (!list_empty(&conn->mgmtqueue)) | |
1062 | goto check_mgmt; | |
1063 | } | |
1064 | ||
1065 | while (!list_empty(&conn->requeue)) { | |
1066 | if (conn->session->fast_abort && conn->tmf_state != TMF_INITIAL) | |
1067 | break; | |
1068 | ||
1069 | /* | |
1070 | * we always do fastlogout - conn stop code will clean up. | |
1071 | */ | |
1072 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) | |
1073 | break; | |
1074 | ||
1075 | conn->task = list_entry(conn->requeue.next, | |
1076 | struct iscsi_task, running); | |
1077 | conn->task->state = ISCSI_TASK_RUNNING; | |
1078 | list_move_tail(conn->requeue.next, &conn->run_list); | |
1079 | rc = iscsi_xmit_task(conn); | |
1080 | if (rc) | |
1081 | goto again; | |
1082 | if (!list_empty(&conn->mgmtqueue)) | |
1083 | goto check_mgmt; | |
1084 | } | |
1085 | spin_unlock_bh(&conn->session->lock); | |
1086 | return -ENODATA; | |
1087 | ||
1088 | again: | |
1089 | if (unlikely(conn->suspend_tx)) | |
1090 | rc = -ENODATA; | |
1091 | spin_unlock_bh(&conn->session->lock); | |
1092 | return rc; | |
1093 | } | |
1094 | ||
1095 | static void iscsi_xmitworker(struct work_struct *work) | |
1096 | { | |
1097 | struct iscsi_conn *conn = | |
1098 | container_of(work, struct iscsi_conn, xmitwork); | |
1099 | int rc; | |
1100 | /* | |
1101 | * serialize Xmit worker on a per-connection basis. | |
1102 | */ | |
1103 | do { | |
1104 | rc = iscsi_data_xmit(conn); | |
1105 | } while (rc >= 0 || rc == -EAGAIN); | |
1106 | } | |
1107 | ||
1108 | enum { | |
1109 | FAILURE_BAD_HOST = 1, | |
1110 | FAILURE_SESSION_FAILED, | |
1111 | FAILURE_SESSION_FREED, | |
1112 | FAILURE_WINDOW_CLOSED, | |
1113 | FAILURE_OOM, | |
1114 | FAILURE_SESSION_TERMINATE, | |
1115 | FAILURE_SESSION_IN_RECOVERY, | |
1116 | FAILURE_SESSION_RECOVERY_TIMEOUT, | |
1117 | FAILURE_SESSION_LOGGING_OUT, | |
1118 | FAILURE_SESSION_NOT_READY, | |
1119 | }; | |
1120 | ||
1121 | int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *)) | |
1122 | { | |
1123 | struct iscsi_cls_session *cls_session; | |
1124 | struct Scsi_Host *host; | |
1125 | int reason = 0; | |
1126 | struct iscsi_session *session; | |
1127 | struct iscsi_conn *conn; | |
1128 | struct iscsi_task *task = NULL; | |
1129 | ||
1130 | sc->scsi_done = done; | |
1131 | sc->result = 0; | |
1132 | sc->SCp.ptr = NULL; | |
1133 | ||
1134 | host = sc->device->host; | |
1135 | spin_unlock(host->host_lock); | |
1136 | ||
1137 | cls_session = starget_to_session(scsi_target(sc->device)); | |
1138 | session = cls_session->dd_data; | |
1139 | spin_lock(&session->lock); | |
1140 | ||
1141 | reason = iscsi_session_chkready(cls_session); | |
1142 | if (reason) { | |
1143 | sc->result = reason; | |
1144 | goto fault; | |
1145 | } | |
1146 | ||
1147 | /* | |
1148 | * ISCSI_STATE_FAILED is a temp. state. The recovery | |
1149 | * code will decide what is best to do with command queued | |
1150 | * during this time | |
1151 | */ | |
1152 | if (session->state != ISCSI_STATE_LOGGED_IN && | |
1153 | session->state != ISCSI_STATE_FAILED) { | |
1154 | /* | |
1155 | * to handle the race between when we set the recovery state | |
1156 | * and block the session we requeue here (commands could | |
1157 | * be entering our queuecommand while a block is starting | |
1158 | * up because the block code is not locked) | |
1159 | */ | |
1160 | switch (session->state) { | |
1161 | case ISCSI_STATE_IN_RECOVERY: | |
1162 | reason = FAILURE_SESSION_IN_RECOVERY; | |
1163 | sc->result = DID_IMM_RETRY << 16; | |
1164 | break; | |
1165 | case ISCSI_STATE_LOGGING_OUT: | |
1166 | reason = FAILURE_SESSION_LOGGING_OUT; | |
1167 | sc->result = DID_IMM_RETRY << 16; | |
1168 | break; | |
1169 | case ISCSI_STATE_RECOVERY_FAILED: | |
1170 | reason = FAILURE_SESSION_RECOVERY_TIMEOUT; | |
1171 | sc->result = DID_NO_CONNECT << 16; | |
1172 | break; | |
1173 | case ISCSI_STATE_TERMINATE: | |
1174 | reason = FAILURE_SESSION_TERMINATE; | |
1175 | sc->result = DID_NO_CONNECT << 16; | |
1176 | break; | |
1177 | default: | |
1178 | reason = FAILURE_SESSION_FREED; | |
1179 | sc->result = DID_NO_CONNECT << 16; | |
1180 | } | |
1181 | goto fault; | |
1182 | } | |
1183 | ||
1184 | conn = session->leadconn; | |
1185 | if (!conn) { | |
1186 | reason = FAILURE_SESSION_FREED; | |
1187 | sc->result = DID_NO_CONNECT << 16; | |
1188 | goto fault; | |
1189 | } | |
1190 | ||
1191 | if (iscsi_check_cmdsn_window_closed(conn)) { | |
1192 | reason = FAILURE_WINDOW_CLOSED; | |
1193 | goto reject; | |
1194 | } | |
1195 | ||
1196 | if (!__kfifo_get(session->cmdpool.queue, (void*)&task, | |
1197 | sizeof(void*))) { | |
1198 | reason = FAILURE_OOM; | |
1199 | goto reject; | |
1200 | } | |
1201 | sc->SCp.phase = session->age; | |
1202 | sc->SCp.ptr = (char *)task; | |
1203 | ||
1204 | atomic_set(&task->refcount, 1); | |
1205 | task->state = ISCSI_TASK_PENDING; | |
1206 | task->conn = conn; | |
1207 | task->sc = sc; | |
1208 | INIT_LIST_HEAD(&task->running); | |
1209 | list_add_tail(&task->running, &conn->xmitqueue); | |
1210 | ||
1211 | if (session->tt->caps & CAP_DATA_PATH_OFFLOAD) { | |
1212 | if (iscsi_prep_scsi_cmd_pdu(task)) { | |
1213 | sc->result = DID_ABORT << 16; | |
1214 | sc->scsi_done = NULL; | |
1215 | iscsi_complete_command(task); | |
1216 | goto fault; | |
1217 | } | |
1218 | if (session->tt->xmit_task(task)) { | |
1219 | sc->scsi_done = NULL; | |
1220 | iscsi_complete_command(task); | |
1221 | reason = FAILURE_SESSION_NOT_READY; | |
1222 | goto reject; | |
1223 | } | |
1224 | } else | |
1225 | scsi_queue_work(session->host, &conn->xmitwork); | |
1226 | ||
1227 | session->queued_cmdsn++; | |
1228 | spin_unlock(&session->lock); | |
1229 | spin_lock(host->host_lock); | |
1230 | return 0; | |
1231 | ||
1232 | reject: | |
1233 | spin_unlock(&session->lock); | |
1234 | debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason); | |
1235 | spin_lock(host->host_lock); | |
1236 | return SCSI_MLQUEUE_HOST_BUSY; | |
1237 | ||
1238 | fault: | |
1239 | spin_unlock(&session->lock); | |
1240 | debug_scsi("iscsi: cmd 0x%x is not queued (%d)\n", sc->cmnd[0], reason); | |
1241 | if (!scsi_bidi_cmnd(sc)) | |
1242 | scsi_set_resid(sc, scsi_bufflen(sc)); | |
1243 | else { | |
1244 | scsi_out(sc)->resid = scsi_out(sc)->length; | |
1245 | scsi_in(sc)->resid = scsi_in(sc)->length; | |
1246 | } | |
1247 | done(sc); | |
1248 | spin_lock(host->host_lock); | |
1249 | return 0; | |
1250 | } | |
1251 | EXPORT_SYMBOL_GPL(iscsi_queuecommand); | |
1252 | ||
1253 | int iscsi_change_queue_depth(struct scsi_device *sdev, int depth) | |
1254 | { | |
1255 | if (depth > ISCSI_MAX_CMD_PER_LUN) | |
1256 | depth = ISCSI_MAX_CMD_PER_LUN; | |
1257 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); | |
1258 | return sdev->queue_depth; | |
1259 | } | |
1260 | EXPORT_SYMBOL_GPL(iscsi_change_queue_depth); | |
1261 | ||
1262 | void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session) | |
1263 | { | |
1264 | struct iscsi_session *session = cls_session->dd_data; | |
1265 | ||
1266 | spin_lock_bh(&session->lock); | |
1267 | if (session->state != ISCSI_STATE_LOGGED_IN) { | |
1268 | session->state = ISCSI_STATE_RECOVERY_FAILED; | |
1269 | if (session->leadconn) | |
1270 | wake_up(&session->leadconn->ehwait); | |
1271 | } | |
1272 | spin_unlock_bh(&session->lock); | |
1273 | } | |
1274 | EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout); | |
1275 | ||
1276 | int iscsi_eh_host_reset(struct scsi_cmnd *sc) | |
1277 | { | |
1278 | struct iscsi_cls_session *cls_session; | |
1279 | struct iscsi_session *session; | |
1280 | struct iscsi_conn *conn; | |
1281 | ||
1282 | cls_session = starget_to_session(scsi_target(sc->device)); | |
1283 | session = cls_session->dd_data; | |
1284 | conn = session->leadconn; | |
1285 | ||
1286 | mutex_lock(&session->eh_mutex); | |
1287 | spin_lock_bh(&session->lock); | |
1288 | if (session->state == ISCSI_STATE_TERMINATE) { | |
1289 | failed: | |
1290 | debug_scsi("failing host reset: session terminated " | |
1291 | "[CID %d age %d]\n", conn->id, session->age); | |
1292 | spin_unlock_bh(&session->lock); | |
1293 | mutex_unlock(&session->eh_mutex); | |
1294 | return FAILED; | |
1295 | } | |
1296 | ||
1297 | spin_unlock_bh(&session->lock); | |
1298 | mutex_unlock(&session->eh_mutex); | |
1299 | /* | |
1300 | * we drop the lock here but the leadconn cannot be destoyed while | |
1301 | * we are in the scsi eh | |
1302 | */ | |
1303 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1304 | ||
1305 | debug_scsi("iscsi_eh_host_reset wait for relogin\n"); | |
1306 | wait_event_interruptible(conn->ehwait, | |
1307 | session->state == ISCSI_STATE_TERMINATE || | |
1308 | session->state == ISCSI_STATE_LOGGED_IN || | |
1309 | session->state == ISCSI_STATE_RECOVERY_FAILED); | |
1310 | if (signal_pending(current)) | |
1311 | flush_signals(current); | |
1312 | ||
1313 | mutex_lock(&session->eh_mutex); | |
1314 | spin_lock_bh(&session->lock); | |
1315 | if (session->state == ISCSI_STATE_LOGGED_IN) | |
1316 | iscsi_session_printk(KERN_INFO, session, | |
1317 | "host reset succeeded\n"); | |
1318 | else | |
1319 | goto failed; | |
1320 | spin_unlock_bh(&session->lock); | |
1321 | mutex_unlock(&session->eh_mutex); | |
1322 | return SUCCESS; | |
1323 | } | |
1324 | EXPORT_SYMBOL_GPL(iscsi_eh_host_reset); | |
1325 | ||
1326 | static void iscsi_tmf_timedout(unsigned long data) | |
1327 | { | |
1328 | struct iscsi_conn *conn = (struct iscsi_conn *)data; | |
1329 | struct iscsi_session *session = conn->session; | |
1330 | ||
1331 | spin_lock(&session->lock); | |
1332 | if (conn->tmf_state == TMF_QUEUED) { | |
1333 | conn->tmf_state = TMF_TIMEDOUT; | |
1334 | debug_scsi("tmf timedout\n"); | |
1335 | /* unblock eh_abort() */ | |
1336 | wake_up(&conn->ehwait); | |
1337 | } | |
1338 | spin_unlock(&session->lock); | |
1339 | } | |
1340 | ||
1341 | static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn, | |
1342 | struct iscsi_tm *hdr, int age, | |
1343 | int timeout) | |
1344 | { | |
1345 | struct iscsi_session *session = conn->session; | |
1346 | struct iscsi_task *task; | |
1347 | ||
1348 | task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr, | |
1349 | NULL, 0); | |
1350 | if (!task) { | |
1351 | spin_unlock_bh(&session->lock); | |
1352 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1353 | spin_lock_bh(&session->lock); | |
1354 | debug_scsi("tmf exec failure\n"); | |
1355 | return -EPERM; | |
1356 | } | |
1357 | conn->tmfcmd_pdus_cnt++; | |
1358 | conn->tmf_timer.expires = timeout * HZ + jiffies; | |
1359 | conn->tmf_timer.function = iscsi_tmf_timedout; | |
1360 | conn->tmf_timer.data = (unsigned long)conn; | |
1361 | add_timer(&conn->tmf_timer); | |
1362 | debug_scsi("tmf set timeout\n"); | |
1363 | ||
1364 | spin_unlock_bh(&session->lock); | |
1365 | mutex_unlock(&session->eh_mutex); | |
1366 | ||
1367 | /* | |
1368 | * block eh thread until: | |
1369 | * | |
1370 | * 1) tmf response | |
1371 | * 2) tmf timeout | |
1372 | * 3) session is terminated or restarted or userspace has | |
1373 | * given up on recovery | |
1374 | */ | |
1375 | wait_event_interruptible(conn->ehwait, age != session->age || | |
1376 | session->state != ISCSI_STATE_LOGGED_IN || | |
1377 | conn->tmf_state != TMF_QUEUED); | |
1378 | if (signal_pending(current)) | |
1379 | flush_signals(current); | |
1380 | del_timer_sync(&conn->tmf_timer); | |
1381 | ||
1382 | mutex_lock(&session->eh_mutex); | |
1383 | spin_lock_bh(&session->lock); | |
1384 | /* if the session drops it will clean up the task */ | |
1385 | if (age != session->age || | |
1386 | session->state != ISCSI_STATE_LOGGED_IN) | |
1387 | return -ENOTCONN; | |
1388 | return 0; | |
1389 | } | |
1390 | ||
1391 | /* | |
1392 | * Fail commands. session lock held and recv side suspended and xmit | |
1393 | * thread flushed | |
1394 | */ | |
1395 | static void fail_all_commands(struct iscsi_conn *conn, unsigned lun, | |
1396 | int error) | |
1397 | { | |
1398 | struct iscsi_task *task, *tmp; | |
1399 | ||
1400 | if (conn->task && (conn->task->sc->device->lun == lun || lun == -1)) | |
1401 | conn->task = NULL; | |
1402 | ||
1403 | /* flush pending */ | |
1404 | list_for_each_entry_safe(task, tmp, &conn->xmitqueue, running) { | |
1405 | if (lun == task->sc->device->lun || lun == -1) { | |
1406 | debug_scsi("failing pending sc %p itt 0x%x\n", | |
1407 | task->sc, task->itt); | |
1408 | fail_command(conn, task, error << 16); | |
1409 | } | |
1410 | } | |
1411 | ||
1412 | list_for_each_entry_safe(task, tmp, &conn->requeue, running) { | |
1413 | if (lun == task->sc->device->lun || lun == -1) { | |
1414 | debug_scsi("failing requeued sc %p itt 0x%x\n", | |
1415 | task->sc, task->itt); | |
1416 | fail_command(conn, task, error << 16); | |
1417 | } | |
1418 | } | |
1419 | ||
1420 | /* fail all other running */ | |
1421 | list_for_each_entry_safe(task, tmp, &conn->run_list, running) { | |
1422 | if (lun == task->sc->device->lun || lun == -1) { | |
1423 | debug_scsi("failing in progress sc %p itt 0x%x\n", | |
1424 | task->sc, task->itt); | |
1425 | fail_command(conn, task, DID_BUS_BUSY << 16); | |
1426 | } | |
1427 | } | |
1428 | } | |
1429 | ||
1430 | void iscsi_suspend_tx(struct iscsi_conn *conn) | |
1431 | { | |
1432 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
1433 | if (!(conn->session->tt->caps & CAP_DATA_PATH_OFFLOAD)) | |
1434 | scsi_flush_work(conn->session->host); | |
1435 | } | |
1436 | EXPORT_SYMBOL_GPL(iscsi_suspend_tx); | |
1437 | ||
1438 | static void iscsi_start_tx(struct iscsi_conn *conn) | |
1439 | { | |
1440 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
1441 | if (!(conn->session->tt->caps & CAP_DATA_PATH_OFFLOAD)) | |
1442 | scsi_queue_work(conn->session->host, &conn->xmitwork); | |
1443 | } | |
1444 | ||
1445 | static enum scsi_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *scmd) | |
1446 | { | |
1447 | struct iscsi_cls_session *cls_session; | |
1448 | struct iscsi_session *session; | |
1449 | struct iscsi_conn *conn; | |
1450 | enum scsi_eh_timer_return rc = EH_NOT_HANDLED; | |
1451 | ||
1452 | cls_session = starget_to_session(scsi_target(scmd->device)); | |
1453 | session = cls_session->dd_data; | |
1454 | ||
1455 | debug_scsi("scsi cmd %p timedout\n", scmd); | |
1456 | ||
1457 | spin_lock(&session->lock); | |
1458 | if (session->state != ISCSI_STATE_LOGGED_IN) { | |
1459 | /* | |
1460 | * We are probably in the middle of iscsi recovery so let | |
1461 | * that complete and handle the error. | |
1462 | */ | |
1463 | rc = EH_RESET_TIMER; | |
1464 | goto done; | |
1465 | } | |
1466 | ||
1467 | conn = session->leadconn; | |
1468 | if (!conn) { | |
1469 | /* In the middle of shuting down */ | |
1470 | rc = EH_RESET_TIMER; | |
1471 | goto done; | |
1472 | } | |
1473 | ||
1474 | if (!conn->recv_timeout && !conn->ping_timeout) | |
1475 | goto done; | |
1476 | /* | |
1477 | * if the ping timedout then we are in the middle of cleaning up | |
1478 | * and can let the iscsi eh handle it | |
1479 | */ | |
1480 | if (time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) + | |
1481 | (conn->ping_timeout * HZ), jiffies)) | |
1482 | rc = EH_RESET_TIMER; | |
1483 | /* | |
1484 | * if we are about to check the transport then give the command | |
1485 | * more time | |
1486 | */ | |
1487 | if (time_before_eq(conn->last_recv + (conn->recv_timeout * HZ), | |
1488 | jiffies)) | |
1489 | rc = EH_RESET_TIMER; | |
1490 | /* if in the middle of checking the transport then give us more time */ | |
1491 | if (conn->ping_task) | |
1492 | rc = EH_RESET_TIMER; | |
1493 | done: | |
1494 | spin_unlock(&session->lock); | |
1495 | debug_scsi("return %s\n", rc == EH_RESET_TIMER ? "timer reset" : "nh"); | |
1496 | return rc; | |
1497 | } | |
1498 | ||
1499 | static void iscsi_check_transport_timeouts(unsigned long data) | |
1500 | { | |
1501 | struct iscsi_conn *conn = (struct iscsi_conn *)data; | |
1502 | struct iscsi_session *session = conn->session; | |
1503 | unsigned long recv_timeout, next_timeout = 0, last_recv; | |
1504 | ||
1505 | spin_lock(&session->lock); | |
1506 | if (session->state != ISCSI_STATE_LOGGED_IN) | |
1507 | goto done; | |
1508 | ||
1509 | recv_timeout = conn->recv_timeout; | |
1510 | if (!recv_timeout) | |
1511 | goto done; | |
1512 | ||
1513 | recv_timeout *= HZ; | |
1514 | last_recv = conn->last_recv; | |
1515 | if (conn->ping_task && | |
1516 | time_before_eq(conn->last_ping + (conn->ping_timeout * HZ), | |
1517 | jiffies)) { | |
1518 | iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs " | |
1519 | "expired, last rx %lu, last ping %lu, " | |
1520 | "now %lu\n", conn->ping_timeout, last_recv, | |
1521 | conn->last_ping, jiffies); | |
1522 | spin_unlock(&session->lock); | |
1523 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1524 | return; | |
1525 | } | |
1526 | ||
1527 | if (time_before_eq(last_recv + recv_timeout, jiffies)) { | |
1528 | /* send a ping to try to provoke some traffic */ | |
1529 | debug_scsi("Sending nopout as ping on conn %p\n", conn); | |
1530 | iscsi_send_nopout(conn, NULL); | |
1531 | next_timeout = conn->last_ping + (conn->ping_timeout * HZ); | |
1532 | } else | |
1533 | next_timeout = last_recv + recv_timeout; | |
1534 | ||
1535 | debug_scsi("Setting next tmo %lu\n", next_timeout); | |
1536 | mod_timer(&conn->transport_timer, next_timeout); | |
1537 | done: | |
1538 | spin_unlock(&session->lock); | |
1539 | } | |
1540 | ||
1541 | static void iscsi_prep_abort_task_pdu(struct iscsi_task *task, | |
1542 | struct iscsi_tm *hdr) | |
1543 | { | |
1544 | memset(hdr, 0, sizeof(*hdr)); | |
1545 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
1546 | hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK; | |
1547 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
1548 | memcpy(hdr->lun, task->hdr->lun, sizeof(hdr->lun)); | |
1549 | hdr->rtt = task->hdr->itt; | |
1550 | hdr->refcmdsn = task->hdr->cmdsn; | |
1551 | } | |
1552 | ||
1553 | int iscsi_eh_abort(struct scsi_cmnd *sc) | |
1554 | { | |
1555 | struct iscsi_cls_session *cls_session; | |
1556 | struct iscsi_session *session; | |
1557 | struct iscsi_conn *conn; | |
1558 | struct iscsi_task *task; | |
1559 | struct iscsi_tm *hdr; | |
1560 | int rc, age; | |
1561 | ||
1562 | cls_session = starget_to_session(scsi_target(sc->device)); | |
1563 | session = cls_session->dd_data; | |
1564 | ||
1565 | mutex_lock(&session->eh_mutex); | |
1566 | spin_lock_bh(&session->lock); | |
1567 | /* | |
1568 | * if session was ISCSI_STATE_IN_RECOVERY then we may not have | |
1569 | * got the command. | |
1570 | */ | |
1571 | if (!sc->SCp.ptr) { | |
1572 | debug_scsi("sc never reached iscsi layer or it completed.\n"); | |
1573 | spin_unlock_bh(&session->lock); | |
1574 | mutex_unlock(&session->eh_mutex); | |
1575 | return SUCCESS; | |
1576 | } | |
1577 | ||
1578 | /* | |
1579 | * If we are not logged in or we have started a new session | |
1580 | * then let the host reset code handle this | |
1581 | */ | |
1582 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN || | |
1583 | sc->SCp.phase != session->age) { | |
1584 | spin_unlock_bh(&session->lock); | |
1585 | mutex_unlock(&session->eh_mutex); | |
1586 | return FAILED; | |
1587 | } | |
1588 | ||
1589 | conn = session->leadconn; | |
1590 | conn->eh_abort_cnt++; | |
1591 | age = session->age; | |
1592 | ||
1593 | task = (struct iscsi_task *)sc->SCp.ptr; | |
1594 | debug_scsi("aborting [sc %p itt 0x%x]\n", sc, task->itt); | |
1595 | ||
1596 | /* task completed before time out */ | |
1597 | if (!task->sc) { | |
1598 | debug_scsi("sc completed while abort in progress\n"); | |
1599 | goto success; | |
1600 | } | |
1601 | ||
1602 | if (task->state == ISCSI_TASK_PENDING) { | |
1603 | fail_command(conn, task, DID_ABORT << 16); | |
1604 | goto success; | |
1605 | } | |
1606 | ||
1607 | /* only have one tmf outstanding at a time */ | |
1608 | if (conn->tmf_state != TMF_INITIAL) | |
1609 | goto failed; | |
1610 | conn->tmf_state = TMF_QUEUED; | |
1611 | ||
1612 | hdr = &conn->tmhdr; | |
1613 | iscsi_prep_abort_task_pdu(task, hdr); | |
1614 | ||
1615 | if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout)) { | |
1616 | rc = FAILED; | |
1617 | goto failed; | |
1618 | } | |
1619 | ||
1620 | switch (conn->tmf_state) { | |
1621 | case TMF_SUCCESS: | |
1622 | spin_unlock_bh(&session->lock); | |
1623 | iscsi_suspend_tx(conn); | |
1624 | /* | |
1625 | * clean up task if aborted. grab the recv lock as a writer | |
1626 | */ | |
1627 | write_lock_bh(conn->recv_lock); | |
1628 | spin_lock(&session->lock); | |
1629 | fail_command(conn, task, DID_ABORT << 16); | |
1630 | conn->tmf_state = TMF_INITIAL; | |
1631 | spin_unlock(&session->lock); | |
1632 | write_unlock_bh(conn->recv_lock); | |
1633 | iscsi_start_tx(conn); | |
1634 | goto success_unlocked; | |
1635 | case TMF_TIMEDOUT: | |
1636 | spin_unlock_bh(&session->lock); | |
1637 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1638 | goto failed_unlocked; | |
1639 | case TMF_NOT_FOUND: | |
1640 | if (!sc->SCp.ptr) { | |
1641 | conn->tmf_state = TMF_INITIAL; | |
1642 | /* task completed before tmf abort response */ | |
1643 | debug_scsi("sc completed while abort in progress\n"); | |
1644 | goto success; | |
1645 | } | |
1646 | /* fall through */ | |
1647 | default: | |
1648 | conn->tmf_state = TMF_INITIAL; | |
1649 | goto failed; | |
1650 | } | |
1651 | ||
1652 | success: | |
1653 | spin_unlock_bh(&session->lock); | |
1654 | success_unlocked: | |
1655 | debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, task->itt); | |
1656 | mutex_unlock(&session->eh_mutex); | |
1657 | return SUCCESS; | |
1658 | ||
1659 | failed: | |
1660 | spin_unlock_bh(&session->lock); | |
1661 | failed_unlocked: | |
1662 | debug_scsi("abort failed [sc %p itt 0x%x]\n", sc, | |
1663 | task ? task->itt : 0); | |
1664 | mutex_unlock(&session->eh_mutex); | |
1665 | return FAILED; | |
1666 | } | |
1667 | EXPORT_SYMBOL_GPL(iscsi_eh_abort); | |
1668 | ||
1669 | static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr) | |
1670 | { | |
1671 | memset(hdr, 0, sizeof(*hdr)); | |
1672 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
1673 | hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK; | |
1674 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
1675 | int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun); | |
1676 | hdr->rtt = RESERVED_ITT; | |
1677 | } | |
1678 | ||
1679 | int iscsi_eh_device_reset(struct scsi_cmnd *sc) | |
1680 | { | |
1681 | struct iscsi_cls_session *cls_session; | |
1682 | struct iscsi_session *session; | |
1683 | struct iscsi_conn *conn; | |
1684 | struct iscsi_tm *hdr; | |
1685 | int rc = FAILED; | |
1686 | ||
1687 | cls_session = starget_to_session(scsi_target(sc->device)); | |
1688 | session = cls_session->dd_data; | |
1689 | ||
1690 | debug_scsi("LU Reset [sc %p lun %u]\n", sc, sc->device->lun); | |
1691 | ||
1692 | mutex_lock(&session->eh_mutex); | |
1693 | spin_lock_bh(&session->lock); | |
1694 | /* | |
1695 | * Just check if we are not logged in. We cannot check for | |
1696 | * the phase because the reset could come from a ioctl. | |
1697 | */ | |
1698 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN) | |
1699 | goto unlock; | |
1700 | conn = session->leadconn; | |
1701 | ||
1702 | /* only have one tmf outstanding at a time */ | |
1703 | if (conn->tmf_state != TMF_INITIAL) | |
1704 | goto unlock; | |
1705 | conn->tmf_state = TMF_QUEUED; | |
1706 | ||
1707 | hdr = &conn->tmhdr; | |
1708 | iscsi_prep_lun_reset_pdu(sc, hdr); | |
1709 | ||
1710 | if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age, | |
1711 | session->lu_reset_timeout)) { | |
1712 | rc = FAILED; | |
1713 | goto unlock; | |
1714 | } | |
1715 | ||
1716 | switch (conn->tmf_state) { | |
1717 | case TMF_SUCCESS: | |
1718 | break; | |
1719 | case TMF_TIMEDOUT: | |
1720 | spin_unlock_bh(&session->lock); | |
1721 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1722 | goto done; | |
1723 | default: | |
1724 | conn->tmf_state = TMF_INITIAL; | |
1725 | goto unlock; | |
1726 | } | |
1727 | ||
1728 | rc = SUCCESS; | |
1729 | spin_unlock_bh(&session->lock); | |
1730 | ||
1731 | iscsi_suspend_tx(conn); | |
1732 | /* need to grab the recv lock then session lock */ | |
1733 | write_lock_bh(conn->recv_lock); | |
1734 | spin_lock(&session->lock); | |
1735 | fail_all_commands(conn, sc->device->lun, DID_ERROR); | |
1736 | conn->tmf_state = TMF_INITIAL; | |
1737 | spin_unlock(&session->lock); | |
1738 | write_unlock_bh(conn->recv_lock); | |
1739 | ||
1740 | iscsi_start_tx(conn); | |
1741 | goto done; | |
1742 | ||
1743 | unlock: | |
1744 | spin_unlock_bh(&session->lock); | |
1745 | done: | |
1746 | debug_scsi("iscsi_eh_device_reset %s\n", | |
1747 | rc == SUCCESS ? "SUCCESS" : "FAILED"); | |
1748 | mutex_unlock(&session->eh_mutex); | |
1749 | return rc; | |
1750 | } | |
1751 | EXPORT_SYMBOL_GPL(iscsi_eh_device_reset); | |
1752 | ||
1753 | /* | |
1754 | * Pre-allocate a pool of @max items of @item_size. By default, the pool | |
1755 | * should be accessed via kfifo_{get,put} on q->queue. | |
1756 | * Optionally, the caller can obtain the array of object pointers | |
1757 | * by passing in a non-NULL @items pointer | |
1758 | */ | |
1759 | int | |
1760 | iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size) | |
1761 | { | |
1762 | int i, num_arrays = 1; | |
1763 | ||
1764 | memset(q, 0, sizeof(*q)); | |
1765 | ||
1766 | q->max = max; | |
1767 | ||
1768 | /* If the user passed an items pointer, he wants a copy of | |
1769 | * the array. */ | |
1770 | if (items) | |
1771 | num_arrays++; | |
1772 | q->pool = kzalloc(num_arrays * max * sizeof(void*), GFP_KERNEL); | |
1773 | if (q->pool == NULL) | |
1774 | goto enomem; | |
1775 | ||
1776 | q->queue = kfifo_init((void*)q->pool, max * sizeof(void*), | |
1777 | GFP_KERNEL, NULL); | |
1778 | if (q->queue == ERR_PTR(-ENOMEM)) | |
1779 | goto enomem; | |
1780 | ||
1781 | for (i = 0; i < max; i++) { | |
1782 | q->pool[i] = kzalloc(item_size, GFP_KERNEL); | |
1783 | if (q->pool[i] == NULL) { | |
1784 | q->max = i; | |
1785 | goto enomem; | |
1786 | } | |
1787 | __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*)); | |
1788 | } | |
1789 | ||
1790 | if (items) { | |
1791 | *items = q->pool + max; | |
1792 | memcpy(*items, q->pool, max * sizeof(void *)); | |
1793 | } | |
1794 | ||
1795 | return 0; | |
1796 | ||
1797 | enomem: | |
1798 | iscsi_pool_free(q); | |
1799 | return -ENOMEM; | |
1800 | } | |
1801 | EXPORT_SYMBOL_GPL(iscsi_pool_init); | |
1802 | ||
1803 | void iscsi_pool_free(struct iscsi_pool *q) | |
1804 | { | |
1805 | int i; | |
1806 | ||
1807 | for (i = 0; i < q->max; i++) | |
1808 | kfree(q->pool[i]); | |
1809 | if (q->pool) | |
1810 | kfree(q->pool); | |
1811 | } | |
1812 | EXPORT_SYMBOL_GPL(iscsi_pool_free); | |
1813 | ||
1814 | /** | |
1815 | * iscsi_host_add - add host to system | |
1816 | * @shost: scsi host | |
1817 | * @pdev: parent device | |
1818 | * | |
1819 | * This should be called by partial offload and software iscsi drivers | |
1820 | * to add a host to the system. | |
1821 | */ | |
1822 | int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev) | |
1823 | { | |
1824 | return scsi_add_host(shost, pdev); | |
1825 | } | |
1826 | EXPORT_SYMBOL_GPL(iscsi_host_add); | |
1827 | ||
1828 | /** | |
1829 | * iscsi_host_alloc - allocate a host and driver data | |
1830 | * @sht: scsi host template | |
1831 | * @dd_data_size: driver host data size | |
1832 | * @qdepth: default device queue depth | |
1833 | * | |
1834 | * This should be called by partial offload and software iscsi drivers. | |
1835 | * To access the driver specific memory use the iscsi_host_priv() macro. | |
1836 | */ | |
1837 | struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht, | |
1838 | int dd_data_size, uint16_t qdepth) | |
1839 | { | |
1840 | struct Scsi_Host *shost; | |
1841 | ||
1842 | shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size); | |
1843 | if (!shost) | |
1844 | return NULL; | |
1845 | shost->transportt->eh_timed_out = iscsi_eh_cmd_timed_out; | |
1846 | ||
1847 | if (qdepth > ISCSI_MAX_CMD_PER_LUN || qdepth < 1) { | |
1848 | if (qdepth != 0) | |
1849 | printk(KERN_ERR "iscsi: invalid queue depth of %d. " | |
1850 | "Queue depth must be between 1 and %d.\n", | |
1851 | qdepth, ISCSI_MAX_CMD_PER_LUN); | |
1852 | qdepth = ISCSI_DEF_CMD_PER_LUN; | |
1853 | } | |
1854 | shost->cmd_per_lun = qdepth; | |
1855 | return shost; | |
1856 | } | |
1857 | EXPORT_SYMBOL_GPL(iscsi_host_alloc); | |
1858 | ||
1859 | /** | |
1860 | * iscsi_host_remove - remove host and sessions | |
1861 | * @shost: scsi host | |
1862 | * | |
1863 | * This will also remove any sessions attached to the host, but if userspace | |
1864 | * is managing the session at the same time this will break. TODO: add | |
1865 | * refcounting to the netlink iscsi interface so a rmmod or host hot unplug | |
1866 | * does not remove the memory from under us. | |
1867 | */ | |
1868 | void iscsi_host_remove(struct Scsi_Host *shost) | |
1869 | { | |
1870 | iscsi_host_for_each_session(shost, iscsi_session_teardown); | |
1871 | scsi_remove_host(shost); | |
1872 | } | |
1873 | EXPORT_SYMBOL_GPL(iscsi_host_remove); | |
1874 | ||
1875 | void iscsi_host_free(struct Scsi_Host *shost) | |
1876 | { | |
1877 | struct iscsi_host *ihost = shost_priv(shost); | |
1878 | ||
1879 | kfree(ihost->netdev); | |
1880 | kfree(ihost->hwaddress); | |
1881 | kfree(ihost->initiatorname); | |
1882 | scsi_host_put(shost); | |
1883 | } | |
1884 | EXPORT_SYMBOL_GPL(iscsi_host_free); | |
1885 | ||
1886 | /** | |
1887 | * iscsi_session_setup - create iscsi cls session and host and session | |
1888 | * @iscsit: iscsi transport template | |
1889 | * @shost: scsi host | |
1890 | * @cmds_max: session can queue | |
1891 | * @cmd_task_size: LLD task private data size | |
1892 | * @initial_cmdsn: initial CmdSN | |
1893 | * | |
1894 | * This can be used by software iscsi_transports that allocate | |
1895 | * a session per scsi host. | |
1896 | */ | |
1897 | struct iscsi_cls_session * | |
1898 | iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost, | |
1899 | uint16_t scsi_cmds_max, int cmd_task_size, | |
1900 | uint32_t initial_cmdsn, unsigned int id) | |
1901 | { | |
1902 | struct iscsi_session *session; | |
1903 | struct iscsi_cls_session *cls_session; | |
1904 | int cmd_i, cmds_max; | |
1905 | ||
1906 | /* | |
1907 | * The iscsi layer needs some tasks for nop handling and tmfs. | |
1908 | */ | |
1909 | if (scsi_cmds_max < 1) | |
1910 | scsi_cmds_max = ISCSI_MGMT_CMDS_MAX; | |
1911 | if ((scsi_cmds_max + ISCSI_MGMT_CMDS_MAX) >= ISCSI_MGMT_ITT_OFFSET) { | |
1912 | printk(KERN_ERR "iscsi: invalid can_queue of %d. " | |
1913 | "can_queue must be less than %d.\n", | |
1914 | scsi_cmds_max, | |
1915 | ISCSI_MGMT_ITT_OFFSET - ISCSI_MGMT_CMDS_MAX); | |
1916 | scsi_cmds_max = ISCSI_DEF_XMIT_CMDS_MAX; | |
1917 | } | |
1918 | cmds_max = roundup_pow_of_two(scsi_cmds_max + ISCSI_MGMT_CMDS_MAX); | |
1919 | ||
1920 | cls_session = iscsi_alloc_session(shost, iscsit, | |
1921 | sizeof(struct iscsi_session)); | |
1922 | if (!cls_session) | |
1923 | return NULL; | |
1924 | session = cls_session->dd_data; | |
1925 | session->cls_session = cls_session; | |
1926 | session->host = shost; | |
1927 | session->state = ISCSI_STATE_FREE; | |
1928 | session->fast_abort = 1; | |
1929 | session->lu_reset_timeout = 15; | |
1930 | session->abort_timeout = 10; | |
1931 | session->scsi_cmds_max = scsi_cmds_max; | |
1932 | session->cmds_max = cmds_max; | |
1933 | session->queued_cmdsn = session->cmdsn = initial_cmdsn; | |
1934 | session->exp_cmdsn = initial_cmdsn + 1; | |
1935 | session->max_cmdsn = initial_cmdsn + 1; | |
1936 | session->max_r2t = 1; | |
1937 | session->tt = iscsit; | |
1938 | mutex_init(&session->eh_mutex); | |
1939 | spin_lock_init(&session->lock); | |
1940 | ||
1941 | /* initialize SCSI PDU commands pool */ | |
1942 | if (iscsi_pool_init(&session->cmdpool, session->cmds_max, | |
1943 | (void***)&session->cmds, | |
1944 | cmd_task_size + sizeof(struct iscsi_task))) | |
1945 | goto cmdpool_alloc_fail; | |
1946 | ||
1947 | /* pre-format cmds pool with ITT */ | |
1948 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
1949 | struct iscsi_task *task = session->cmds[cmd_i]; | |
1950 | ||
1951 | if (cmd_task_size) | |
1952 | task->dd_data = &task[1]; | |
1953 | task->itt = cmd_i; | |
1954 | INIT_LIST_HEAD(&task->running); | |
1955 | } | |
1956 | ||
1957 | if (!try_module_get(iscsit->owner)) | |
1958 | goto module_get_fail; | |
1959 | ||
1960 | if (iscsi_add_session(cls_session, id)) | |
1961 | goto cls_session_fail; | |
1962 | return cls_session; | |
1963 | ||
1964 | cls_session_fail: | |
1965 | module_put(iscsit->owner); | |
1966 | module_get_fail: | |
1967 | iscsi_pool_free(&session->cmdpool); | |
1968 | cmdpool_alloc_fail: | |
1969 | iscsi_free_session(cls_session); | |
1970 | return NULL; | |
1971 | } | |
1972 | EXPORT_SYMBOL_GPL(iscsi_session_setup); | |
1973 | ||
1974 | /** | |
1975 | * iscsi_session_teardown - destroy session, host, and cls_session | |
1976 | * @cls_session: iscsi session | |
1977 | * | |
1978 | * The driver must have called iscsi_remove_session before | |
1979 | * calling this. | |
1980 | */ | |
1981 | void iscsi_session_teardown(struct iscsi_cls_session *cls_session) | |
1982 | { | |
1983 | struct iscsi_session *session = cls_session->dd_data; | |
1984 | struct module *owner = cls_session->transport->owner; | |
1985 | ||
1986 | iscsi_pool_free(&session->cmdpool); | |
1987 | ||
1988 | kfree(session->password); | |
1989 | kfree(session->password_in); | |
1990 | kfree(session->username); | |
1991 | kfree(session->username_in); | |
1992 | kfree(session->targetname); | |
1993 | ||
1994 | iscsi_destroy_session(cls_session); | |
1995 | module_put(owner); | |
1996 | } | |
1997 | EXPORT_SYMBOL_GPL(iscsi_session_teardown); | |
1998 | ||
1999 | /** | |
2000 | * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn | |
2001 | * @cls_session: iscsi_cls_session | |
2002 | * @dd_size: private driver data size | |
2003 | * @conn_idx: cid | |
2004 | */ | |
2005 | struct iscsi_cls_conn * | |
2006 | iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size, | |
2007 | uint32_t conn_idx) | |
2008 | { | |
2009 | struct iscsi_session *session = cls_session->dd_data; | |
2010 | struct iscsi_conn *conn; | |
2011 | struct iscsi_cls_conn *cls_conn; | |
2012 | char *data; | |
2013 | ||
2014 | cls_conn = iscsi_create_conn(cls_session, sizeof(*conn) + dd_size, | |
2015 | conn_idx); | |
2016 | if (!cls_conn) | |
2017 | return NULL; | |
2018 | conn = cls_conn->dd_data; | |
2019 | memset(conn, 0, sizeof(*conn) + dd_size); | |
2020 | ||
2021 | conn->dd_data = cls_conn->dd_data + sizeof(*conn); | |
2022 | conn->session = session; | |
2023 | conn->cls_conn = cls_conn; | |
2024 | conn->c_stage = ISCSI_CONN_INITIAL_STAGE; | |
2025 | conn->id = conn_idx; | |
2026 | conn->exp_statsn = 0; | |
2027 | conn->tmf_state = TMF_INITIAL; | |
2028 | ||
2029 | init_timer(&conn->transport_timer); | |
2030 | conn->transport_timer.data = (unsigned long)conn; | |
2031 | conn->transport_timer.function = iscsi_check_transport_timeouts; | |
2032 | ||
2033 | INIT_LIST_HEAD(&conn->run_list); | |
2034 | INIT_LIST_HEAD(&conn->mgmt_run_list); | |
2035 | INIT_LIST_HEAD(&conn->mgmtqueue); | |
2036 | INIT_LIST_HEAD(&conn->xmitqueue); | |
2037 | INIT_LIST_HEAD(&conn->requeue); | |
2038 | INIT_WORK(&conn->xmitwork, iscsi_xmitworker); | |
2039 | ||
2040 | /* allocate login_task used for the login/text sequences */ | |
2041 | spin_lock_bh(&session->lock); | |
2042 | if (!__kfifo_get(session->cmdpool.queue, | |
2043 | (void*)&conn->login_task, | |
2044 | sizeof(void*))) { | |
2045 | spin_unlock_bh(&session->lock); | |
2046 | goto login_task_alloc_fail; | |
2047 | } | |
2048 | spin_unlock_bh(&session->lock); | |
2049 | ||
2050 | data = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN, GFP_KERNEL); | |
2051 | if (!data) | |
2052 | goto login_task_data_alloc_fail; | |
2053 | conn->login_task->data = conn->data = data; | |
2054 | ||
2055 | init_timer(&conn->tmf_timer); | |
2056 | init_waitqueue_head(&conn->ehwait); | |
2057 | ||
2058 | return cls_conn; | |
2059 | ||
2060 | login_task_data_alloc_fail: | |
2061 | __kfifo_put(session->cmdpool.queue, (void*)&conn->login_task, | |
2062 | sizeof(void*)); | |
2063 | login_task_alloc_fail: | |
2064 | iscsi_destroy_conn(cls_conn); | |
2065 | return NULL; | |
2066 | } | |
2067 | EXPORT_SYMBOL_GPL(iscsi_conn_setup); | |
2068 | ||
2069 | /** | |
2070 | * iscsi_conn_teardown - teardown iscsi connection | |
2071 | * cls_conn: iscsi class connection | |
2072 | * | |
2073 | * TODO: we may need to make this into a two step process | |
2074 | * like scsi-mls remove + put host | |
2075 | */ | |
2076 | void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn) | |
2077 | { | |
2078 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2079 | struct iscsi_session *session = conn->session; | |
2080 | unsigned long flags; | |
2081 | ||
2082 | del_timer_sync(&conn->transport_timer); | |
2083 | ||
2084 | spin_lock_bh(&session->lock); | |
2085 | conn->c_stage = ISCSI_CONN_CLEANUP_WAIT; | |
2086 | if (session->leadconn == conn) { | |
2087 | /* | |
2088 | * leading connection? then give up on recovery. | |
2089 | */ | |
2090 | session->state = ISCSI_STATE_TERMINATE; | |
2091 | wake_up(&conn->ehwait); | |
2092 | } | |
2093 | spin_unlock_bh(&session->lock); | |
2094 | ||
2095 | /* | |
2096 | * Block until all in-progress commands for this connection | |
2097 | * time out or fail. | |
2098 | */ | |
2099 | for (;;) { | |
2100 | spin_lock_irqsave(session->host->host_lock, flags); | |
2101 | if (!session->host->host_busy) { /* OK for ERL == 0 */ | |
2102 | spin_unlock_irqrestore(session->host->host_lock, flags); | |
2103 | break; | |
2104 | } | |
2105 | spin_unlock_irqrestore(session->host->host_lock, flags); | |
2106 | msleep_interruptible(500); | |
2107 | iscsi_conn_printk(KERN_INFO, conn, "iscsi conn_destroy(): " | |
2108 | "host_busy %d host_failed %d\n", | |
2109 | session->host->host_busy, | |
2110 | session->host->host_failed); | |
2111 | /* | |
2112 | * force eh_abort() to unblock | |
2113 | */ | |
2114 | wake_up(&conn->ehwait); | |
2115 | } | |
2116 | ||
2117 | /* flush queued up work because we free the connection below */ | |
2118 | iscsi_suspend_tx(conn); | |
2119 | ||
2120 | spin_lock_bh(&session->lock); | |
2121 | kfree(conn->data); | |
2122 | kfree(conn->persistent_address); | |
2123 | __kfifo_put(session->cmdpool.queue, (void*)&conn->login_task, | |
2124 | sizeof(void*)); | |
2125 | if (session->leadconn == conn) | |
2126 | session->leadconn = NULL; | |
2127 | spin_unlock_bh(&session->lock); | |
2128 | ||
2129 | iscsi_destroy_conn(cls_conn); | |
2130 | } | |
2131 | EXPORT_SYMBOL_GPL(iscsi_conn_teardown); | |
2132 | ||
2133 | int iscsi_conn_start(struct iscsi_cls_conn *cls_conn) | |
2134 | { | |
2135 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2136 | struct iscsi_session *session = conn->session; | |
2137 | ||
2138 | if (!session) { | |
2139 | iscsi_conn_printk(KERN_ERR, conn, | |
2140 | "can't start unbound connection\n"); | |
2141 | return -EPERM; | |
2142 | } | |
2143 | ||
2144 | if ((session->imm_data_en || !session->initial_r2t_en) && | |
2145 | session->first_burst > session->max_burst) { | |
2146 | iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: " | |
2147 | "first_burst %d max_burst %d\n", | |
2148 | session->first_burst, session->max_burst); | |
2149 | return -EINVAL; | |
2150 | } | |
2151 | ||
2152 | if (conn->ping_timeout && !conn->recv_timeout) { | |
2153 | iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of " | |
2154 | "zero. Using 5 seconds\n."); | |
2155 | conn->recv_timeout = 5; | |
2156 | } | |
2157 | ||
2158 | if (conn->recv_timeout && !conn->ping_timeout) { | |
2159 | iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of " | |
2160 | "zero. Using 5 seconds.\n"); | |
2161 | conn->ping_timeout = 5; | |
2162 | } | |
2163 | ||
2164 | spin_lock_bh(&session->lock); | |
2165 | conn->c_stage = ISCSI_CONN_STARTED; | |
2166 | session->state = ISCSI_STATE_LOGGED_IN; | |
2167 | session->queued_cmdsn = session->cmdsn; | |
2168 | ||
2169 | conn->last_recv = jiffies; | |
2170 | conn->last_ping = jiffies; | |
2171 | if (conn->recv_timeout && conn->ping_timeout) | |
2172 | mod_timer(&conn->transport_timer, | |
2173 | jiffies + (conn->recv_timeout * HZ)); | |
2174 | ||
2175 | switch(conn->stop_stage) { | |
2176 | case STOP_CONN_RECOVER: | |
2177 | /* | |
2178 | * unblock eh_abort() if it is blocked. re-try all | |
2179 | * commands after successful recovery | |
2180 | */ | |
2181 | conn->stop_stage = 0; | |
2182 | conn->tmf_state = TMF_INITIAL; | |
2183 | session->age++; | |
2184 | if (session->age == 16) | |
2185 | session->age = 0; | |
2186 | break; | |
2187 | case STOP_CONN_TERM: | |
2188 | conn->stop_stage = 0; | |
2189 | break; | |
2190 | default: | |
2191 | break; | |
2192 | } | |
2193 | spin_unlock_bh(&session->lock); | |
2194 | ||
2195 | iscsi_unblock_session(session->cls_session); | |
2196 | wake_up(&conn->ehwait); | |
2197 | return 0; | |
2198 | } | |
2199 | EXPORT_SYMBOL_GPL(iscsi_conn_start); | |
2200 | ||
2201 | static void | |
2202 | flush_control_queues(struct iscsi_session *session, struct iscsi_conn *conn) | |
2203 | { | |
2204 | struct iscsi_task *task, *tmp; | |
2205 | ||
2206 | /* handle pending */ | |
2207 | list_for_each_entry_safe(task, tmp, &conn->mgmtqueue, running) { | |
2208 | debug_scsi("flushing pending mgmt task itt 0x%x\n", task->itt); | |
2209 | /* release ref from prep task */ | |
2210 | __iscsi_put_task(task); | |
2211 | } | |
2212 | ||
2213 | /* handle running */ | |
2214 | list_for_each_entry_safe(task, tmp, &conn->mgmt_run_list, running) { | |
2215 | debug_scsi("flushing running mgmt task itt 0x%x\n", task->itt); | |
2216 | /* release ref from prep task */ | |
2217 | __iscsi_put_task(task); | |
2218 | } | |
2219 | ||
2220 | conn->task = NULL; | |
2221 | } | |
2222 | ||
2223 | static void iscsi_start_session_recovery(struct iscsi_session *session, | |
2224 | struct iscsi_conn *conn, int flag) | |
2225 | { | |
2226 | int old_stop_stage; | |
2227 | ||
2228 | del_timer_sync(&conn->transport_timer); | |
2229 | ||
2230 | mutex_lock(&session->eh_mutex); | |
2231 | spin_lock_bh(&session->lock); | |
2232 | if (conn->stop_stage == STOP_CONN_TERM) { | |
2233 | spin_unlock_bh(&session->lock); | |
2234 | mutex_unlock(&session->eh_mutex); | |
2235 | return; | |
2236 | } | |
2237 | ||
2238 | /* | |
2239 | * The LLD either freed/unset the lock on us, or userspace called | |
2240 | * stop but did not create a proper connection (connection was never | |
2241 | * bound or it was unbound then stop was called). | |
2242 | */ | |
2243 | if (!conn->recv_lock) { | |
2244 | spin_unlock_bh(&session->lock); | |
2245 | mutex_unlock(&session->eh_mutex); | |
2246 | return; | |
2247 | } | |
2248 | ||
2249 | /* | |
2250 | * When this is called for the in_login state, we only want to clean | |
2251 | * up the login task and connection. We do not need to block and set | |
2252 | * the recovery state again | |
2253 | */ | |
2254 | if (flag == STOP_CONN_TERM) | |
2255 | session->state = ISCSI_STATE_TERMINATE; | |
2256 | else if (conn->stop_stage != STOP_CONN_RECOVER) | |
2257 | session->state = ISCSI_STATE_IN_RECOVERY; | |
2258 | ||
2259 | old_stop_stage = conn->stop_stage; | |
2260 | conn->stop_stage = flag; | |
2261 | conn->c_stage = ISCSI_CONN_STOPPED; | |
2262 | spin_unlock_bh(&session->lock); | |
2263 | ||
2264 | iscsi_suspend_tx(conn); | |
2265 | ||
2266 | write_lock_bh(conn->recv_lock); | |
2267 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
2268 | write_unlock_bh(conn->recv_lock); | |
2269 | ||
2270 | /* | |
2271 | * for connection level recovery we should not calculate | |
2272 | * header digest. conn->hdr_size used for optimization | |
2273 | * in hdr_extract() and will be re-negotiated at | |
2274 | * set_param() time. | |
2275 | */ | |
2276 | if (flag == STOP_CONN_RECOVER) { | |
2277 | conn->hdrdgst_en = 0; | |
2278 | conn->datadgst_en = 0; | |
2279 | if (session->state == ISCSI_STATE_IN_RECOVERY && | |
2280 | old_stop_stage != STOP_CONN_RECOVER) { | |
2281 | debug_scsi("blocking session\n"); | |
2282 | iscsi_block_session(session->cls_session); | |
2283 | } | |
2284 | } | |
2285 | ||
2286 | /* | |
2287 | * flush queues. | |
2288 | */ | |
2289 | spin_lock_bh(&session->lock); | |
2290 | fail_all_commands(conn, -1, | |
2291 | STOP_CONN_RECOVER ? DID_BUS_BUSY : DID_ERROR); | |
2292 | flush_control_queues(session, conn); | |
2293 | spin_unlock_bh(&session->lock); | |
2294 | mutex_unlock(&session->eh_mutex); | |
2295 | } | |
2296 | ||
2297 | void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) | |
2298 | { | |
2299 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2300 | struct iscsi_session *session = conn->session; | |
2301 | ||
2302 | switch (flag) { | |
2303 | case STOP_CONN_RECOVER: | |
2304 | case STOP_CONN_TERM: | |
2305 | iscsi_start_session_recovery(session, conn, flag); | |
2306 | break; | |
2307 | default: | |
2308 | iscsi_conn_printk(KERN_ERR, conn, | |
2309 | "invalid stop flag %d\n", flag); | |
2310 | } | |
2311 | } | |
2312 | EXPORT_SYMBOL_GPL(iscsi_conn_stop); | |
2313 | ||
2314 | int iscsi_conn_bind(struct iscsi_cls_session *cls_session, | |
2315 | struct iscsi_cls_conn *cls_conn, int is_leading) | |
2316 | { | |
2317 | struct iscsi_session *session = cls_session->dd_data; | |
2318 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2319 | ||
2320 | spin_lock_bh(&session->lock); | |
2321 | if (is_leading) | |
2322 | session->leadconn = conn; | |
2323 | spin_unlock_bh(&session->lock); | |
2324 | ||
2325 | /* | |
2326 | * Unblock xmitworker(), Login Phase will pass through. | |
2327 | */ | |
2328 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
2329 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
2330 | return 0; | |
2331 | } | |
2332 | EXPORT_SYMBOL_GPL(iscsi_conn_bind); | |
2333 | ||
2334 | ||
2335 | int iscsi_set_param(struct iscsi_cls_conn *cls_conn, | |
2336 | enum iscsi_param param, char *buf, int buflen) | |
2337 | { | |
2338 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2339 | struct iscsi_session *session = conn->session; | |
2340 | uint32_t value; | |
2341 | ||
2342 | switch(param) { | |
2343 | case ISCSI_PARAM_FAST_ABORT: | |
2344 | sscanf(buf, "%d", &session->fast_abort); | |
2345 | break; | |
2346 | case ISCSI_PARAM_ABORT_TMO: | |
2347 | sscanf(buf, "%d", &session->abort_timeout); | |
2348 | break; | |
2349 | case ISCSI_PARAM_LU_RESET_TMO: | |
2350 | sscanf(buf, "%d", &session->lu_reset_timeout); | |
2351 | break; | |
2352 | case ISCSI_PARAM_PING_TMO: | |
2353 | sscanf(buf, "%d", &conn->ping_timeout); | |
2354 | break; | |
2355 | case ISCSI_PARAM_RECV_TMO: | |
2356 | sscanf(buf, "%d", &conn->recv_timeout); | |
2357 | break; | |
2358 | case ISCSI_PARAM_MAX_RECV_DLENGTH: | |
2359 | sscanf(buf, "%d", &conn->max_recv_dlength); | |
2360 | break; | |
2361 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
2362 | sscanf(buf, "%d", &conn->max_xmit_dlength); | |
2363 | break; | |
2364 | case ISCSI_PARAM_HDRDGST_EN: | |
2365 | sscanf(buf, "%d", &conn->hdrdgst_en); | |
2366 | break; | |
2367 | case ISCSI_PARAM_DATADGST_EN: | |
2368 | sscanf(buf, "%d", &conn->datadgst_en); | |
2369 | break; | |
2370 | case ISCSI_PARAM_INITIAL_R2T_EN: | |
2371 | sscanf(buf, "%d", &session->initial_r2t_en); | |
2372 | break; | |
2373 | case ISCSI_PARAM_MAX_R2T: | |
2374 | sscanf(buf, "%d", &session->max_r2t); | |
2375 | break; | |
2376 | case ISCSI_PARAM_IMM_DATA_EN: | |
2377 | sscanf(buf, "%d", &session->imm_data_en); | |
2378 | break; | |
2379 | case ISCSI_PARAM_FIRST_BURST: | |
2380 | sscanf(buf, "%d", &session->first_burst); | |
2381 | break; | |
2382 | case ISCSI_PARAM_MAX_BURST: | |
2383 | sscanf(buf, "%d", &session->max_burst); | |
2384 | break; | |
2385 | case ISCSI_PARAM_PDU_INORDER_EN: | |
2386 | sscanf(buf, "%d", &session->pdu_inorder_en); | |
2387 | break; | |
2388 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
2389 | sscanf(buf, "%d", &session->dataseq_inorder_en); | |
2390 | break; | |
2391 | case ISCSI_PARAM_ERL: | |
2392 | sscanf(buf, "%d", &session->erl); | |
2393 | break; | |
2394 | case ISCSI_PARAM_IFMARKER_EN: | |
2395 | sscanf(buf, "%d", &value); | |
2396 | BUG_ON(value); | |
2397 | break; | |
2398 | case ISCSI_PARAM_OFMARKER_EN: | |
2399 | sscanf(buf, "%d", &value); | |
2400 | BUG_ON(value); | |
2401 | break; | |
2402 | case ISCSI_PARAM_EXP_STATSN: | |
2403 | sscanf(buf, "%u", &conn->exp_statsn); | |
2404 | break; | |
2405 | case ISCSI_PARAM_USERNAME: | |
2406 | kfree(session->username); | |
2407 | session->username = kstrdup(buf, GFP_KERNEL); | |
2408 | if (!session->username) | |
2409 | return -ENOMEM; | |
2410 | break; | |
2411 | case ISCSI_PARAM_USERNAME_IN: | |
2412 | kfree(session->username_in); | |
2413 | session->username_in = kstrdup(buf, GFP_KERNEL); | |
2414 | if (!session->username_in) | |
2415 | return -ENOMEM; | |
2416 | break; | |
2417 | case ISCSI_PARAM_PASSWORD: | |
2418 | kfree(session->password); | |
2419 | session->password = kstrdup(buf, GFP_KERNEL); | |
2420 | if (!session->password) | |
2421 | return -ENOMEM; | |
2422 | break; | |
2423 | case ISCSI_PARAM_PASSWORD_IN: | |
2424 | kfree(session->password_in); | |
2425 | session->password_in = kstrdup(buf, GFP_KERNEL); | |
2426 | if (!session->password_in) | |
2427 | return -ENOMEM; | |
2428 | break; | |
2429 | case ISCSI_PARAM_TARGET_NAME: | |
2430 | /* this should not change between logins */ | |
2431 | if (session->targetname) | |
2432 | break; | |
2433 | ||
2434 | session->targetname = kstrdup(buf, GFP_KERNEL); | |
2435 | if (!session->targetname) | |
2436 | return -ENOMEM; | |
2437 | break; | |
2438 | case ISCSI_PARAM_TPGT: | |
2439 | sscanf(buf, "%d", &session->tpgt); | |
2440 | break; | |
2441 | case ISCSI_PARAM_PERSISTENT_PORT: | |
2442 | sscanf(buf, "%d", &conn->persistent_port); | |
2443 | break; | |
2444 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
2445 | /* | |
2446 | * this is the address returned in discovery so it should | |
2447 | * not change between logins. | |
2448 | */ | |
2449 | if (conn->persistent_address) | |
2450 | break; | |
2451 | ||
2452 | conn->persistent_address = kstrdup(buf, GFP_KERNEL); | |
2453 | if (!conn->persistent_address) | |
2454 | return -ENOMEM; | |
2455 | break; | |
2456 | default: | |
2457 | return -ENOSYS; | |
2458 | } | |
2459 | ||
2460 | return 0; | |
2461 | } | |
2462 | EXPORT_SYMBOL_GPL(iscsi_set_param); | |
2463 | ||
2464 | int iscsi_session_get_param(struct iscsi_cls_session *cls_session, | |
2465 | enum iscsi_param param, char *buf) | |
2466 | { | |
2467 | struct iscsi_session *session = cls_session->dd_data; | |
2468 | int len; | |
2469 | ||
2470 | switch(param) { | |
2471 | case ISCSI_PARAM_FAST_ABORT: | |
2472 | len = sprintf(buf, "%d\n", session->fast_abort); | |
2473 | break; | |
2474 | case ISCSI_PARAM_ABORT_TMO: | |
2475 | len = sprintf(buf, "%d\n", session->abort_timeout); | |
2476 | break; | |
2477 | case ISCSI_PARAM_LU_RESET_TMO: | |
2478 | len = sprintf(buf, "%d\n", session->lu_reset_timeout); | |
2479 | break; | |
2480 | case ISCSI_PARAM_INITIAL_R2T_EN: | |
2481 | len = sprintf(buf, "%d\n", session->initial_r2t_en); | |
2482 | break; | |
2483 | case ISCSI_PARAM_MAX_R2T: | |
2484 | len = sprintf(buf, "%hu\n", session->max_r2t); | |
2485 | break; | |
2486 | case ISCSI_PARAM_IMM_DATA_EN: | |
2487 | len = sprintf(buf, "%d\n", session->imm_data_en); | |
2488 | break; | |
2489 | case ISCSI_PARAM_FIRST_BURST: | |
2490 | len = sprintf(buf, "%u\n", session->first_burst); | |
2491 | break; | |
2492 | case ISCSI_PARAM_MAX_BURST: | |
2493 | len = sprintf(buf, "%u\n", session->max_burst); | |
2494 | break; | |
2495 | case ISCSI_PARAM_PDU_INORDER_EN: | |
2496 | len = sprintf(buf, "%d\n", session->pdu_inorder_en); | |
2497 | break; | |
2498 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
2499 | len = sprintf(buf, "%d\n", session->dataseq_inorder_en); | |
2500 | break; | |
2501 | case ISCSI_PARAM_ERL: | |
2502 | len = sprintf(buf, "%d\n", session->erl); | |
2503 | break; | |
2504 | case ISCSI_PARAM_TARGET_NAME: | |
2505 | len = sprintf(buf, "%s\n", session->targetname); | |
2506 | break; | |
2507 | case ISCSI_PARAM_TPGT: | |
2508 | len = sprintf(buf, "%d\n", session->tpgt); | |
2509 | break; | |
2510 | case ISCSI_PARAM_USERNAME: | |
2511 | len = sprintf(buf, "%s\n", session->username); | |
2512 | break; | |
2513 | case ISCSI_PARAM_USERNAME_IN: | |
2514 | len = sprintf(buf, "%s\n", session->username_in); | |
2515 | break; | |
2516 | case ISCSI_PARAM_PASSWORD: | |
2517 | len = sprintf(buf, "%s\n", session->password); | |
2518 | break; | |
2519 | case ISCSI_PARAM_PASSWORD_IN: | |
2520 | len = sprintf(buf, "%s\n", session->password_in); | |
2521 | break; | |
2522 | default: | |
2523 | return -ENOSYS; | |
2524 | } | |
2525 | ||
2526 | return len; | |
2527 | } | |
2528 | EXPORT_SYMBOL_GPL(iscsi_session_get_param); | |
2529 | ||
2530 | int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn, | |
2531 | enum iscsi_param param, char *buf) | |
2532 | { | |
2533 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2534 | int len; | |
2535 | ||
2536 | switch(param) { | |
2537 | case ISCSI_PARAM_PING_TMO: | |
2538 | len = sprintf(buf, "%u\n", conn->ping_timeout); | |
2539 | break; | |
2540 | case ISCSI_PARAM_RECV_TMO: | |
2541 | len = sprintf(buf, "%u\n", conn->recv_timeout); | |
2542 | break; | |
2543 | case ISCSI_PARAM_MAX_RECV_DLENGTH: | |
2544 | len = sprintf(buf, "%u\n", conn->max_recv_dlength); | |
2545 | break; | |
2546 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
2547 | len = sprintf(buf, "%u\n", conn->max_xmit_dlength); | |
2548 | break; | |
2549 | case ISCSI_PARAM_HDRDGST_EN: | |
2550 | len = sprintf(buf, "%d\n", conn->hdrdgst_en); | |
2551 | break; | |
2552 | case ISCSI_PARAM_DATADGST_EN: | |
2553 | len = sprintf(buf, "%d\n", conn->datadgst_en); | |
2554 | break; | |
2555 | case ISCSI_PARAM_IFMARKER_EN: | |
2556 | len = sprintf(buf, "%d\n", conn->ifmarker_en); | |
2557 | break; | |
2558 | case ISCSI_PARAM_OFMARKER_EN: | |
2559 | len = sprintf(buf, "%d\n", conn->ofmarker_en); | |
2560 | break; | |
2561 | case ISCSI_PARAM_EXP_STATSN: | |
2562 | len = sprintf(buf, "%u\n", conn->exp_statsn); | |
2563 | break; | |
2564 | case ISCSI_PARAM_PERSISTENT_PORT: | |
2565 | len = sprintf(buf, "%d\n", conn->persistent_port); | |
2566 | break; | |
2567 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
2568 | len = sprintf(buf, "%s\n", conn->persistent_address); | |
2569 | break; | |
2570 | default: | |
2571 | return -ENOSYS; | |
2572 | } | |
2573 | ||
2574 | return len; | |
2575 | } | |
2576 | EXPORT_SYMBOL_GPL(iscsi_conn_get_param); | |
2577 | ||
2578 | int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param, | |
2579 | char *buf) | |
2580 | { | |
2581 | struct iscsi_host *ihost = shost_priv(shost); | |
2582 | int len; | |
2583 | ||
2584 | switch (param) { | |
2585 | case ISCSI_HOST_PARAM_NETDEV_NAME: | |
2586 | if (!ihost->netdev) | |
2587 | len = sprintf(buf, "%s\n", "default"); | |
2588 | else | |
2589 | len = sprintf(buf, "%s\n", ihost->netdev); | |
2590 | break; | |
2591 | case ISCSI_HOST_PARAM_HWADDRESS: | |
2592 | if (!ihost->hwaddress) | |
2593 | len = sprintf(buf, "%s\n", "default"); | |
2594 | else | |
2595 | len = sprintf(buf, "%s\n", ihost->hwaddress); | |
2596 | break; | |
2597 | case ISCSI_HOST_PARAM_INITIATOR_NAME: | |
2598 | if (!ihost->initiatorname) | |
2599 | len = sprintf(buf, "%s\n", "unknown"); | |
2600 | else | |
2601 | len = sprintf(buf, "%s\n", ihost->initiatorname); | |
2602 | break; | |
2603 | case ISCSI_HOST_PARAM_IPADDRESS: | |
2604 | if (!strlen(ihost->local_address)) | |
2605 | len = sprintf(buf, "%s\n", "unknown"); | |
2606 | else | |
2607 | len = sprintf(buf, "%s\n", | |
2608 | ihost->local_address); | |
2609 | default: | |
2610 | return -ENOSYS; | |
2611 | } | |
2612 | ||
2613 | return len; | |
2614 | } | |
2615 | EXPORT_SYMBOL_GPL(iscsi_host_get_param); | |
2616 | ||
2617 | int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param, | |
2618 | char *buf, int buflen) | |
2619 | { | |
2620 | struct iscsi_host *ihost = shost_priv(shost); | |
2621 | ||
2622 | switch (param) { | |
2623 | case ISCSI_HOST_PARAM_NETDEV_NAME: | |
2624 | if (!ihost->netdev) | |
2625 | ihost->netdev = kstrdup(buf, GFP_KERNEL); | |
2626 | break; | |
2627 | case ISCSI_HOST_PARAM_HWADDRESS: | |
2628 | if (!ihost->hwaddress) | |
2629 | ihost->hwaddress = kstrdup(buf, GFP_KERNEL); | |
2630 | break; | |
2631 | case ISCSI_HOST_PARAM_INITIATOR_NAME: | |
2632 | if (!ihost->initiatorname) | |
2633 | ihost->initiatorname = kstrdup(buf, GFP_KERNEL); | |
2634 | break; | |
2635 | default: | |
2636 | return -ENOSYS; | |
2637 | } | |
2638 | ||
2639 | return 0; | |
2640 | } | |
2641 | EXPORT_SYMBOL_GPL(iscsi_host_set_param); | |
2642 | ||
2643 | MODULE_AUTHOR("Mike Christie"); | |
2644 | MODULE_DESCRIPTION("iSCSI library functions"); | |
2645 | MODULE_LICENSE("GPL"); |