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7996a778 MC |
1 | /* |
2 | * iSCSI lib functions | |
3 | * | |
4 | * Copyright (C) 2006 Red Hat, Inc. All rights reserved. | |
5 | * Copyright (C) 2004 - 2006 Mike Christie | |
6 | * Copyright (C) 2004 - 2005 Dmitry Yusupov | |
7 | * Copyright (C) 2004 - 2005 Alex Aizman | |
8 | * maintained by open-iscsi@googlegroups.com | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
23 | */ | |
24 | #include <linux/types.h> | |
25 | #include <linux/mutex.h> | |
26 | #include <linux/kfifo.h> | |
27 | #include <linux/delay.h> | |
28 | #include <net/tcp.h> | |
29 | #include <scsi/scsi_cmnd.h> | |
30 | #include <scsi/scsi_device.h> | |
31 | #include <scsi/scsi_eh.h> | |
32 | #include <scsi/scsi_tcq.h> | |
33 | #include <scsi/scsi_host.h> | |
34 | #include <scsi/scsi.h> | |
35 | #include <scsi/iscsi_proto.h> | |
36 | #include <scsi/scsi_transport.h> | |
37 | #include <scsi/scsi_transport_iscsi.h> | |
38 | #include <scsi/libiscsi.h> | |
39 | ||
40 | struct iscsi_session * | |
41 | class_to_transport_session(struct iscsi_cls_session *cls_session) | |
42 | { | |
43 | struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); | |
44 | return iscsi_hostdata(shost->hostdata); | |
45 | } | |
46 | EXPORT_SYMBOL_GPL(class_to_transport_session); | |
47 | ||
48 | #define INVALID_SN_DELTA 0xffff | |
49 | ||
50 | int | |
51 | iscsi_check_assign_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr) | |
52 | { | |
53 | uint32_t max_cmdsn = be32_to_cpu(hdr->max_cmdsn); | |
54 | uint32_t exp_cmdsn = be32_to_cpu(hdr->exp_cmdsn); | |
55 | ||
56 | if (max_cmdsn < exp_cmdsn -1 && | |
57 | max_cmdsn > exp_cmdsn - INVALID_SN_DELTA) | |
58 | return ISCSI_ERR_MAX_CMDSN; | |
59 | if (max_cmdsn > session->max_cmdsn || | |
60 | max_cmdsn < session->max_cmdsn - INVALID_SN_DELTA) | |
61 | session->max_cmdsn = max_cmdsn; | |
62 | if (exp_cmdsn > session->exp_cmdsn || | |
63 | exp_cmdsn < session->exp_cmdsn - INVALID_SN_DELTA) | |
64 | session->exp_cmdsn = exp_cmdsn; | |
65 | ||
66 | return 0; | |
67 | } | |
68 | EXPORT_SYMBOL_GPL(iscsi_check_assign_cmdsn); | |
69 | ||
70 | void iscsi_prep_unsolicit_data_pdu(struct iscsi_cmd_task *ctask, | |
ffd0436e | 71 | struct iscsi_data *hdr) |
7996a778 MC |
72 | { |
73 | struct iscsi_conn *conn = ctask->conn; | |
74 | ||
75 | memset(hdr, 0, sizeof(struct iscsi_data)); | |
76 | hdr->ttt = cpu_to_be32(ISCSI_RESERVED_TAG); | |
77 | hdr->datasn = cpu_to_be32(ctask->unsol_datasn); | |
78 | ctask->unsol_datasn++; | |
79 | hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; | |
80 | memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); | |
81 | ||
82 | hdr->itt = ctask->hdr->itt; | |
83 | hdr->exp_statsn = cpu_to_be32(conn->exp_statsn); | |
ffd0436e | 84 | hdr->offset = cpu_to_be32(ctask->unsol_offset); |
7996a778 MC |
85 | |
86 | if (ctask->unsol_count > conn->max_xmit_dlength) { | |
87 | hton24(hdr->dlength, conn->max_xmit_dlength); | |
88 | ctask->data_count = conn->max_xmit_dlength; | |
ffd0436e | 89 | ctask->unsol_offset += ctask->data_count; |
7996a778 MC |
90 | hdr->flags = 0; |
91 | } else { | |
92 | hton24(hdr->dlength, ctask->unsol_count); | |
93 | ctask->data_count = ctask->unsol_count; | |
94 | hdr->flags = ISCSI_FLAG_CMD_FINAL; | |
95 | } | |
96 | } | |
97 | EXPORT_SYMBOL_GPL(iscsi_prep_unsolicit_data_pdu); | |
98 | ||
99 | /** | |
100 | * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu | |
101 | * @ctask: iscsi cmd task | |
102 | * | |
103 | * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set | |
104 | * fields like dlength or final based on how much data it sends | |
105 | */ | |
106 | static void iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask) | |
107 | { | |
108 | struct iscsi_conn *conn = ctask->conn; | |
109 | struct iscsi_session *session = conn->session; | |
110 | struct iscsi_cmd *hdr = ctask->hdr; | |
111 | struct scsi_cmnd *sc = ctask->sc; | |
112 | ||
113 | hdr->opcode = ISCSI_OP_SCSI_CMD; | |
114 | hdr->flags = ISCSI_ATTR_SIMPLE; | |
115 | int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun); | |
116 | hdr->itt = ctask->itt | (conn->id << ISCSI_CID_SHIFT) | | |
117 | (session->age << ISCSI_AGE_SHIFT); | |
118 | hdr->data_length = cpu_to_be32(sc->request_bufflen); | |
119 | hdr->cmdsn = cpu_to_be32(session->cmdsn); | |
120 | session->cmdsn++; | |
121 | hdr->exp_statsn = cpu_to_be32(conn->exp_statsn); | |
122 | memcpy(hdr->cdb, sc->cmnd, sc->cmd_len); | |
123 | memset(&hdr->cdb[sc->cmd_len], 0, MAX_COMMAND_SIZE - sc->cmd_len); | |
124 | ||
ffd0436e | 125 | ctask->data_count = 0; |
7996a778 MC |
126 | if (sc->sc_data_direction == DMA_TO_DEVICE) { |
127 | hdr->flags |= ISCSI_FLAG_CMD_WRITE; | |
128 | /* | |
129 | * Write counters: | |
130 | * | |
131 | * imm_count bytes to be sent right after | |
132 | * SCSI PDU Header | |
133 | * | |
134 | * unsol_count bytes(as Data-Out) to be sent | |
135 | * without R2T ack right after | |
136 | * immediate data | |
137 | * | |
138 | * r2t_data_count bytes to be sent via R2T ack's | |
139 | * | |
140 | * pad_count bytes to be sent as zero-padding | |
141 | */ | |
142 | ctask->imm_count = 0; | |
143 | ctask->unsol_count = 0; | |
ffd0436e | 144 | ctask->unsol_offset = 0; |
7996a778 MC |
145 | ctask->unsol_datasn = 0; |
146 | ||
147 | if (session->imm_data_en) { | |
148 | if (ctask->total_length >= session->first_burst) | |
149 | ctask->imm_count = min(session->first_burst, | |
150 | conn->max_xmit_dlength); | |
151 | else | |
152 | ctask->imm_count = min(ctask->total_length, | |
153 | conn->max_xmit_dlength); | |
154 | hton24(ctask->hdr->dlength, ctask->imm_count); | |
155 | } else | |
156 | zero_data(ctask->hdr->dlength); | |
157 | ||
ffd0436e | 158 | if (!session->initial_r2t_en) { |
7996a778 MC |
159 | ctask->unsol_count = min(session->first_burst, |
160 | ctask->total_length) - ctask->imm_count; | |
ffd0436e MC |
161 | ctask->unsol_offset = ctask->imm_count; |
162 | } | |
163 | ||
7996a778 MC |
164 | if (!ctask->unsol_count) |
165 | /* No unsolicit Data-Out's */ | |
166 | ctask->hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
167 | } else { | |
168 | ctask->datasn = 0; | |
169 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
170 | zero_data(hdr->dlength); | |
171 | ||
172 | if (sc->sc_data_direction == DMA_FROM_DEVICE) | |
173 | hdr->flags |= ISCSI_FLAG_CMD_READ; | |
174 | } | |
175 | ||
176 | conn->scsicmd_pdus_cnt++; | |
177 | } | |
178 | EXPORT_SYMBOL_GPL(iscsi_prep_scsi_cmd_pdu); | |
179 | ||
180 | /** | |
181 | * iscsi_complete_command - return command back to scsi-ml | |
7996a778 MC |
182 | * @ctask: iscsi cmd task |
183 | * | |
184 | * Must be called with session lock. | |
185 | * This function returns the scsi command to scsi-ml and returns | |
186 | * the cmd task to the pool of available cmd tasks. | |
187 | */ | |
60ecebf5 | 188 | static void iscsi_complete_command(struct iscsi_cmd_task *ctask) |
7996a778 | 189 | { |
60ecebf5 | 190 | struct iscsi_session *session = ctask->conn->session; |
7996a778 MC |
191 | struct scsi_cmnd *sc = ctask->sc; |
192 | ||
b6c395ed | 193 | ctask->state = ISCSI_TASK_COMPLETED; |
7996a778 MC |
194 | ctask->sc = NULL; |
195 | list_del_init(&ctask->running); | |
196 | __kfifo_put(session->cmdpool.queue, (void*)&ctask, sizeof(void*)); | |
197 | sc->scsi_done(sc); | |
198 | } | |
199 | ||
60ecebf5 MC |
200 | static void __iscsi_get_ctask(struct iscsi_cmd_task *ctask) |
201 | { | |
202 | atomic_inc(&ctask->refcount); | |
203 | } | |
204 | ||
205 | static void iscsi_get_ctask(struct iscsi_cmd_task *ctask) | |
206 | { | |
207 | spin_lock_bh(&ctask->conn->session->lock); | |
208 | __iscsi_get_ctask(ctask); | |
209 | spin_unlock_bh(&ctask->conn->session->lock); | |
210 | } | |
211 | ||
212 | static void __iscsi_put_ctask(struct iscsi_cmd_task *ctask) | |
213 | { | |
214 | struct iscsi_conn *conn = ctask->conn; | |
215 | ||
216 | if (atomic_dec_and_test(&ctask->refcount)) { | |
217 | conn->session->tt->cleanup_cmd_task(conn, ctask); | |
218 | iscsi_complete_command(ctask); | |
219 | } | |
220 | } | |
221 | ||
222 | static void iscsi_put_ctask(struct iscsi_cmd_task *ctask) | |
223 | { | |
224 | spin_lock_bh(&ctask->conn->session->lock); | |
225 | __iscsi_put_ctask(ctask); | |
226 | spin_unlock_bh(&ctask->conn->session->lock); | |
227 | } | |
228 | ||
7996a778 MC |
229 | /** |
230 | * iscsi_cmd_rsp - SCSI Command Response processing | |
231 | * @conn: iscsi connection | |
232 | * @hdr: iscsi header | |
233 | * @ctask: scsi command task | |
234 | * @data: cmd data buffer | |
235 | * @datalen: len of buffer | |
236 | * | |
237 | * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and | |
238 | * then completes the command and task. | |
239 | **/ | |
240 | static int iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
241 | struct iscsi_cmd_task *ctask, char *data, | |
242 | int datalen) | |
243 | { | |
244 | int rc; | |
245 | struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)hdr; | |
246 | struct iscsi_session *session = conn->session; | |
247 | struct scsi_cmnd *sc = ctask->sc; | |
248 | ||
249 | rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr); | |
250 | if (rc) { | |
251 | sc->result = DID_ERROR << 16; | |
252 | goto out; | |
253 | } | |
254 | ||
255 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; | |
256 | ||
257 | sc->result = (DID_OK << 16) | rhdr->cmd_status; | |
258 | ||
259 | if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) { | |
260 | sc->result = DID_ERROR << 16; | |
261 | goto out; | |
262 | } | |
263 | ||
264 | if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) { | |
265 | int senselen; | |
266 | ||
267 | if (datalen < 2) { | |
268 | invalid_datalen: | |
be2df72e OG |
269 | printk(KERN_ERR "iscsi: Got CHECK_CONDITION but " |
270 | "invalid data buffer size of %d\n", datalen); | |
7996a778 MC |
271 | sc->result = DID_BAD_TARGET << 16; |
272 | goto out; | |
273 | } | |
274 | ||
275 | senselen = (data[0] << 8) | data[1]; | |
276 | if (datalen < senselen) | |
277 | goto invalid_datalen; | |
278 | ||
279 | memcpy(sc->sense_buffer, data + 2, | |
280 | min(senselen, SCSI_SENSE_BUFFERSIZE)); | |
281 | debug_scsi("copied %d bytes of sense\n", | |
282 | min(senselen, SCSI_SENSE_BUFFERSIZE)); | |
283 | } | |
284 | ||
285 | if (sc->sc_data_direction == DMA_TO_DEVICE) | |
286 | goto out; | |
287 | ||
288 | if (rhdr->flags & ISCSI_FLAG_CMD_UNDERFLOW) { | |
289 | int res_count = be32_to_cpu(rhdr->residual_count); | |
290 | ||
291 | if (res_count > 0 && res_count <= sc->request_bufflen) | |
292 | sc->resid = res_count; | |
293 | else | |
294 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
295 | } else if (rhdr->flags & ISCSI_FLAG_CMD_BIDI_UNDERFLOW) | |
296 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
297 | else if (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW) | |
298 | sc->resid = be32_to_cpu(rhdr->residual_count); | |
299 | ||
300 | out: | |
301 | debug_scsi("done [sc %lx res %d itt 0x%x]\n", | |
302 | (long)sc, sc->result, ctask->itt); | |
303 | conn->scsirsp_pdus_cnt++; | |
304 | ||
60ecebf5 | 305 | __iscsi_put_ctask(ctask); |
7996a778 MC |
306 | return rc; |
307 | } | |
308 | ||
7ea8b828 MC |
309 | static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr) |
310 | { | |
311 | struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr; | |
312 | ||
313 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
314 | conn->tmfrsp_pdus_cnt++; | |
315 | ||
316 | if (conn->tmabort_state != TMABORT_INITIAL) | |
317 | return; | |
318 | ||
319 | if (tmf->response == ISCSI_TMF_RSP_COMPLETE) | |
320 | conn->tmabort_state = TMABORT_SUCCESS; | |
321 | else if (tmf->response == ISCSI_TMF_RSP_NO_TASK) | |
322 | conn->tmabort_state = TMABORT_NOT_FOUND; | |
323 | else | |
324 | conn->tmabort_state = TMABORT_FAILED; | |
325 | wake_up(&conn->ehwait); | |
326 | } | |
327 | ||
62f38300 MC |
328 | static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
329 | char *data, int datalen) | |
330 | { | |
331 | struct iscsi_reject *reject = (struct iscsi_reject *)hdr; | |
332 | struct iscsi_hdr rejected_pdu; | |
333 | uint32_t itt; | |
334 | ||
335 | conn->exp_statsn = be32_to_cpu(reject->statsn) + 1; | |
336 | ||
337 | if (reject->reason == ISCSI_REASON_DATA_DIGEST_ERROR) { | |
338 | if (ntoh24(reject->dlength) > datalen) | |
339 | return ISCSI_ERR_PROTO; | |
340 | ||
341 | if (ntoh24(reject->dlength) >= sizeof(struct iscsi_hdr)) { | |
342 | memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr)); | |
343 | itt = rejected_pdu.itt & ISCSI_ITT_MASK; | |
344 | printk(KERN_ERR "itt 0x%x had pdu (op 0x%x) rejected " | |
345 | "due to DataDigest error.\n", itt, | |
346 | rejected_pdu.opcode); | |
347 | } | |
348 | } | |
349 | return 0; | |
350 | } | |
351 | ||
7996a778 MC |
352 | /** |
353 | * __iscsi_complete_pdu - complete pdu | |
354 | * @conn: iscsi conn | |
355 | * @hdr: iscsi header | |
356 | * @data: data buffer | |
357 | * @datalen: len of data buffer | |
358 | * | |
359 | * Completes pdu processing by freeing any resources allocated at | |
360 | * queuecommand or send generic. session lock must be held and verify | |
361 | * itt must have been called. | |
362 | */ | |
363 | int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
364 | char *data, int datalen) | |
365 | { | |
366 | struct iscsi_session *session = conn->session; | |
367 | int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0; | |
368 | struct iscsi_cmd_task *ctask; | |
369 | struct iscsi_mgmt_task *mtask; | |
370 | uint32_t itt; | |
371 | ||
372 | if (hdr->itt != cpu_to_be32(ISCSI_RESERVED_TAG)) | |
373 | itt = hdr->itt & ISCSI_ITT_MASK; | |
374 | else | |
375 | itt = hdr->itt; | |
376 | ||
377 | if (itt < session->cmds_max) { | |
378 | ctask = session->cmds[itt]; | |
379 | ||
380 | debug_scsi("cmdrsp [op 0x%x cid %d itt 0x%x len %d]\n", | |
381 | opcode, conn->id, ctask->itt, datalen); | |
382 | ||
383 | switch(opcode) { | |
384 | case ISCSI_OP_SCSI_CMD_RSP: | |
385 | BUG_ON((void*)ctask != ctask->sc->SCp.ptr); | |
386 | rc = iscsi_scsi_cmd_rsp(conn, hdr, ctask, data, | |
387 | datalen); | |
388 | break; | |
389 | case ISCSI_OP_SCSI_DATA_IN: | |
390 | BUG_ON((void*)ctask != ctask->sc->SCp.ptr); | |
391 | if (hdr->flags & ISCSI_FLAG_DATA_STATUS) { | |
392 | conn->scsirsp_pdus_cnt++; | |
60ecebf5 | 393 | __iscsi_put_ctask(ctask); |
7996a778 MC |
394 | } |
395 | break; | |
396 | case ISCSI_OP_R2T: | |
397 | /* LLD handles this for now */ | |
398 | break; | |
399 | default: | |
400 | rc = ISCSI_ERR_BAD_OPCODE; | |
401 | break; | |
402 | } | |
403 | } else if (itt >= ISCSI_MGMT_ITT_OFFSET && | |
404 | itt < ISCSI_MGMT_ITT_OFFSET + session->mgmtpool_max) { | |
405 | mtask = session->mgmt_cmds[itt - ISCSI_MGMT_ITT_OFFSET]; | |
406 | ||
407 | debug_scsi("immrsp [op 0x%x cid %d itt 0x%x len %d]\n", | |
408 | opcode, conn->id, mtask->itt, datalen); | |
409 | ||
8d2860b3 MC |
410 | rc = iscsi_check_assign_cmdsn(session, |
411 | (struct iscsi_nopin*)hdr); | |
412 | if (rc) | |
413 | goto done; | |
414 | ||
7996a778 | 415 | switch(opcode) { |
8d2860b3 | 416 | case ISCSI_OP_LOGOUT_RSP: |
c8dc1e52 MC |
417 | if (datalen) { |
418 | rc = ISCSI_ERR_PROTO; | |
419 | break; | |
420 | } | |
8d2860b3 MC |
421 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; |
422 | /* fall through */ | |
7996a778 MC |
423 | case ISCSI_OP_LOGIN_RSP: |
424 | case ISCSI_OP_TEXT_RSP: | |
8d2860b3 MC |
425 | /* |
426 | * login related PDU's exp_statsn is handled in | |
427 | * userspace | |
428 | */ | |
40527afe MC |
429 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) |
430 | rc = ISCSI_ERR_CONN_FAILED; | |
7996a778 MC |
431 | list_del(&mtask->running); |
432 | if (conn->login_mtask != mtask) | |
433 | __kfifo_put(session->mgmtpool.queue, | |
434 | (void*)&mtask, sizeof(void*)); | |
435 | break; | |
436 | case ISCSI_OP_SCSI_TMFUNC_RSP: | |
7996a778 MC |
437 | if (datalen) { |
438 | rc = ISCSI_ERR_PROTO; | |
439 | break; | |
440 | } | |
8d2860b3 | 441 | |
7ea8b828 | 442 | iscsi_tmf_rsp(conn, hdr); |
7996a778 MC |
443 | break; |
444 | case ISCSI_OP_NOOP_IN: | |
c8dc1e52 | 445 | if (hdr->ttt != ISCSI_RESERVED_TAG || datalen) { |
7996a778 MC |
446 | rc = ISCSI_ERR_PROTO; |
447 | break; | |
448 | } | |
7996a778 MC |
449 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; |
450 | ||
40527afe MC |
451 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) |
452 | rc = ISCSI_ERR_CONN_FAILED; | |
7996a778 MC |
453 | list_del(&mtask->running); |
454 | if (conn->login_mtask != mtask) | |
455 | __kfifo_put(session->mgmtpool.queue, | |
456 | (void*)&mtask, sizeof(void*)); | |
457 | break; | |
458 | default: | |
459 | rc = ISCSI_ERR_BAD_OPCODE; | |
460 | break; | |
461 | } | |
462 | } else if (itt == ISCSI_RESERVED_TAG) { | |
62f38300 MC |
463 | rc = iscsi_check_assign_cmdsn(session, |
464 | (struct iscsi_nopin*)hdr); | |
465 | if (rc) | |
466 | goto done; | |
467 | ||
7996a778 MC |
468 | switch(opcode) { |
469 | case ISCSI_OP_NOOP_IN: | |
40527afe | 470 | if (datalen) { |
7996a778 | 471 | rc = ISCSI_ERR_PROTO; |
40527afe MC |
472 | break; |
473 | } | |
474 | ||
40527afe MC |
475 | if (hdr->ttt == ISCSI_RESERVED_TAG) |
476 | break; | |
477 | ||
478 | if (iscsi_recv_pdu(conn->cls_conn, hdr, NULL, 0)) | |
479 | rc = ISCSI_ERR_CONN_FAILED; | |
7996a778 MC |
480 | break; |
481 | case ISCSI_OP_REJECT: | |
62f38300 MC |
482 | rc = iscsi_handle_reject(conn, hdr, data, datalen); |
483 | break; | |
7996a778 | 484 | case ISCSI_OP_ASYNC_EVENT: |
8d2860b3 | 485 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; |
7996a778 MC |
486 | /* we need sth like iscsi_async_event_rsp() */ |
487 | rc = ISCSI_ERR_BAD_OPCODE; | |
488 | break; | |
489 | default: | |
490 | rc = ISCSI_ERR_BAD_OPCODE; | |
491 | break; | |
492 | } | |
493 | } else | |
494 | rc = ISCSI_ERR_BAD_ITT; | |
495 | ||
8d2860b3 | 496 | done: |
7996a778 MC |
497 | return rc; |
498 | } | |
499 | EXPORT_SYMBOL_GPL(__iscsi_complete_pdu); | |
500 | ||
501 | int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
502 | char *data, int datalen) | |
503 | { | |
504 | int rc; | |
505 | ||
506 | spin_lock(&conn->session->lock); | |
507 | rc = __iscsi_complete_pdu(conn, hdr, data, datalen); | |
508 | spin_unlock(&conn->session->lock); | |
509 | return rc; | |
510 | } | |
511 | EXPORT_SYMBOL_GPL(iscsi_complete_pdu); | |
512 | ||
513 | /* verify itt (itt encoding: age+cid+itt) */ | |
514 | int iscsi_verify_itt(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
515 | uint32_t *ret_itt) | |
516 | { | |
517 | struct iscsi_session *session = conn->session; | |
518 | struct iscsi_cmd_task *ctask; | |
519 | uint32_t itt; | |
520 | ||
521 | if (hdr->itt != cpu_to_be32(ISCSI_RESERVED_TAG)) { | |
522 | if ((hdr->itt & ISCSI_AGE_MASK) != | |
523 | (session->age << ISCSI_AGE_SHIFT)) { | |
be2df72e | 524 | printk(KERN_ERR "iscsi: received itt %x expected " |
7996a778 MC |
525 | "session age (%x)\n", hdr->itt, |
526 | session->age & ISCSI_AGE_MASK); | |
527 | return ISCSI_ERR_BAD_ITT; | |
528 | } | |
529 | ||
530 | if ((hdr->itt & ISCSI_CID_MASK) != | |
531 | (conn->id << ISCSI_CID_SHIFT)) { | |
be2df72e | 532 | printk(KERN_ERR "iscsi: received itt %x, expected " |
7996a778 MC |
533 | "CID (%x)\n", hdr->itt, conn->id); |
534 | return ISCSI_ERR_BAD_ITT; | |
535 | } | |
536 | itt = hdr->itt & ISCSI_ITT_MASK; | |
537 | } else | |
538 | itt = hdr->itt; | |
539 | ||
540 | if (itt < session->cmds_max) { | |
541 | ctask = session->cmds[itt]; | |
542 | ||
543 | if (!ctask->sc) { | |
be2df72e | 544 | printk(KERN_INFO "iscsi: dropping ctask with " |
7996a778 MC |
545 | "itt 0x%x\n", ctask->itt); |
546 | /* force drop */ | |
547 | return ISCSI_ERR_NO_SCSI_CMD; | |
548 | } | |
549 | ||
550 | if (ctask->sc->SCp.phase != session->age) { | |
be2df72e | 551 | printk(KERN_ERR "iscsi: ctask's session age %d, " |
7996a778 MC |
552 | "expected %d\n", ctask->sc->SCp.phase, |
553 | session->age); | |
554 | return ISCSI_ERR_SESSION_FAILED; | |
555 | } | |
556 | } | |
557 | ||
558 | *ret_itt = itt; | |
559 | return 0; | |
560 | } | |
561 | EXPORT_SYMBOL_GPL(iscsi_verify_itt); | |
562 | ||
563 | void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err) | |
564 | { | |
565 | struct iscsi_session *session = conn->session; | |
566 | unsigned long flags; | |
567 | ||
568 | spin_lock_irqsave(&session->lock, flags); | |
656cffc9 MC |
569 | if (session->state == ISCSI_STATE_FAILED) { |
570 | spin_unlock_irqrestore(&session->lock, flags); | |
571 | return; | |
572 | } | |
573 | ||
67a61114 | 574 | if (conn->stop_stage == 0) |
7996a778 MC |
575 | session->state = ISCSI_STATE_FAILED; |
576 | spin_unlock_irqrestore(&session->lock, flags); | |
577 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
578 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
579 | iscsi_conn_error(conn->cls_conn, err); | |
580 | } | |
581 | EXPORT_SYMBOL_GPL(iscsi_conn_failure); | |
582 | ||
583 | /** | |
584 | * iscsi_data_xmit - xmit any command into the scheduled connection | |
585 | * @conn: iscsi connection | |
586 | * | |
587 | * Notes: | |
588 | * The function can return -EAGAIN in which case the caller must | |
589 | * re-schedule it again later or recover. '0' return code means | |
590 | * successful xmit. | |
591 | **/ | |
592 | static int iscsi_data_xmit(struct iscsi_conn *conn) | |
593 | { | |
594 | struct iscsi_transport *tt; | |
3219e529 | 595 | int rc = 0; |
7996a778 MC |
596 | |
597 | if (unlikely(conn->suspend_tx)) { | |
598 | debug_scsi("conn %d Tx suspended!\n", conn->id); | |
3219e529 | 599 | return -ENODATA; |
7996a778 MC |
600 | } |
601 | tt = conn->session->tt; | |
602 | ||
603 | /* | |
604 | * Transmit in the following order: | |
605 | * | |
606 | * 1) un-finished xmit (ctask or mtask) | |
607 | * 2) immediate control PDUs | |
608 | * 3) write data | |
609 | * 4) SCSI commands | |
610 | * 5) non-immediate control PDUs | |
611 | * | |
612 | * No need to lock around __kfifo_get as long as | |
613 | * there's one producer and one consumer. | |
614 | */ | |
615 | ||
616 | BUG_ON(conn->ctask && conn->mtask); | |
617 | ||
618 | if (conn->ctask) { | |
60ecebf5 | 619 | iscsi_get_ctask(conn->ctask); |
3219e529 | 620 | rc = tt->xmit_cmd_task(conn, conn->ctask); |
60ecebf5 | 621 | iscsi_put_ctask(conn->ctask); |
3219e529 | 622 | if (rc) |
7996a778 MC |
623 | goto again; |
624 | /* done with this in-progress ctask */ | |
625 | conn->ctask = NULL; | |
626 | } | |
627 | if (conn->mtask) { | |
3219e529 MC |
628 | rc = tt->xmit_mgmt_task(conn, conn->mtask); |
629 | if (rc) | |
7996a778 MC |
630 | goto again; |
631 | /* done with this in-progress mtask */ | |
632 | conn->mtask = NULL; | |
633 | } | |
634 | ||
635 | /* process immediate first */ | |
636 | if (unlikely(__kfifo_len(conn->immqueue))) { | |
637 | while (__kfifo_get(conn->immqueue, (void*)&conn->mtask, | |
638 | sizeof(void*))) { | |
994442e8 | 639 | spin_lock_bh(&conn->session->lock); |
7996a778 MC |
640 | list_add_tail(&conn->mtask->running, |
641 | &conn->mgmt_run_list); | |
994442e8 | 642 | spin_unlock_bh(&conn->session->lock); |
3219e529 MC |
643 | rc = tt->xmit_mgmt_task(conn, conn->mtask); |
644 | if (rc) | |
7996a778 MC |
645 | goto again; |
646 | } | |
647 | /* done with this mtask */ | |
648 | conn->mtask = NULL; | |
649 | } | |
650 | ||
651 | /* process command queue */ | |
b6c395ed MC |
652 | spin_lock_bh(&conn->session->lock); |
653 | while (!list_empty(&conn->xmitqueue)) { | |
7996a778 MC |
654 | /* |
655 | * iscsi tcp may readd the task to the xmitqueue to send | |
656 | * write data | |
657 | */ | |
b6c395ed MC |
658 | conn->ctask = list_entry(conn->xmitqueue.next, |
659 | struct iscsi_cmd_task, running); | |
660 | conn->ctask->state = ISCSI_TASK_RUNNING; | |
661 | list_move_tail(conn->xmitqueue.next, &conn->run_list); | |
60ecebf5 | 662 | __iscsi_get_ctask(conn->ctask); |
994442e8 | 663 | spin_unlock_bh(&conn->session->lock); |
b6c395ed | 664 | |
3219e529 MC |
665 | rc = tt->xmit_cmd_task(conn, conn->ctask); |
666 | if (rc) | |
7996a778 | 667 | goto again; |
60ecebf5 | 668 | |
b6c395ed | 669 | spin_lock_bh(&conn->session->lock); |
60ecebf5 MC |
670 | __iscsi_put_ctask(conn->ctask); |
671 | if (rc) { | |
672 | spin_unlock_bh(&conn->session->lock); | |
673 | goto again; | |
674 | } | |
7996a778 | 675 | } |
b6c395ed | 676 | spin_unlock_bh(&conn->session->lock); |
7996a778 MC |
677 | /* done with this ctask */ |
678 | conn->ctask = NULL; | |
679 | ||
680 | /* process the rest control plane PDUs, if any */ | |
681 | if (unlikely(__kfifo_len(conn->mgmtqueue))) { | |
682 | while (__kfifo_get(conn->mgmtqueue, (void*)&conn->mtask, | |
683 | sizeof(void*))) { | |
994442e8 | 684 | spin_lock_bh(&conn->session->lock); |
7996a778 MC |
685 | list_add_tail(&conn->mtask->running, |
686 | &conn->mgmt_run_list); | |
994442e8 | 687 | spin_unlock_bh(&conn->session->lock); |
3219e529 MC |
688 | rc = tt->xmit_mgmt_task(conn, conn->mtask); |
689 | if (rc) | |
7996a778 MC |
690 | goto again; |
691 | } | |
692 | /* done with this mtask */ | |
693 | conn->mtask = NULL; | |
694 | } | |
695 | ||
3219e529 | 696 | return -ENODATA; |
7996a778 MC |
697 | |
698 | again: | |
699 | if (unlikely(conn->suspend_tx)) | |
3219e529 | 700 | return -ENODATA; |
7996a778 | 701 | |
3219e529 | 702 | return rc; |
7996a778 MC |
703 | } |
704 | ||
705 | static void iscsi_xmitworker(void *data) | |
706 | { | |
707 | struct iscsi_conn *conn = data; | |
3219e529 | 708 | int rc; |
7996a778 MC |
709 | /* |
710 | * serialize Xmit worker on a per-connection basis. | |
711 | */ | |
712 | mutex_lock(&conn->xmitmutex); | |
3219e529 MC |
713 | do { |
714 | rc = iscsi_data_xmit(conn); | |
715 | } while (rc >= 0 || rc == -EAGAIN); | |
7996a778 MC |
716 | mutex_unlock(&conn->xmitmutex); |
717 | } | |
718 | ||
719 | enum { | |
720 | FAILURE_BAD_HOST = 1, | |
721 | FAILURE_SESSION_FAILED, | |
722 | FAILURE_SESSION_FREED, | |
723 | FAILURE_WINDOW_CLOSED, | |
60ecebf5 | 724 | FAILURE_OOM, |
7996a778 | 725 | FAILURE_SESSION_TERMINATE, |
656cffc9 | 726 | FAILURE_SESSION_IN_RECOVERY, |
7996a778 MC |
727 | FAILURE_SESSION_RECOVERY_TIMEOUT, |
728 | }; | |
729 | ||
730 | int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *)) | |
731 | { | |
732 | struct Scsi_Host *host; | |
733 | int reason = 0; | |
734 | struct iscsi_session *session; | |
735 | struct iscsi_conn *conn; | |
736 | struct iscsi_cmd_task *ctask = NULL; | |
737 | ||
738 | sc->scsi_done = done; | |
739 | sc->result = 0; | |
740 | ||
741 | host = sc->device->host; | |
742 | session = iscsi_hostdata(host->hostdata); | |
743 | ||
744 | spin_lock(&session->lock); | |
745 | ||
656cffc9 MC |
746 | /* |
747 | * ISCSI_STATE_FAILED is a temp. state. The recovery | |
748 | * code will decide what is best to do with command queued | |
749 | * during this time | |
750 | */ | |
751 | if (session->state != ISCSI_STATE_LOGGED_IN && | |
752 | session->state != ISCSI_STATE_FAILED) { | |
753 | /* | |
754 | * to handle the race between when we set the recovery state | |
755 | * and block the session we requeue here (commands could | |
756 | * be entering our queuecommand while a block is starting | |
757 | * up because the block code is not locked) | |
758 | */ | |
759 | if (session->state == ISCSI_STATE_IN_RECOVERY) { | |
760 | reason = FAILURE_SESSION_IN_RECOVERY; | |
67a61114 | 761 | goto reject; |
7996a778 | 762 | } |
656cffc9 MC |
763 | |
764 | if (session->state == ISCSI_STATE_RECOVERY_FAILED) | |
765 | reason = FAILURE_SESSION_RECOVERY_TIMEOUT; | |
766 | else if (session->state == ISCSI_STATE_TERMINATE) | |
767 | reason = FAILURE_SESSION_TERMINATE; | |
768 | else | |
769 | reason = FAILURE_SESSION_FREED; | |
7996a778 MC |
770 | goto fault; |
771 | } | |
772 | ||
773 | /* | |
774 | * Check for iSCSI window and take care of CmdSN wrap-around | |
775 | */ | |
776 | if ((int)(session->max_cmdsn - session->cmdsn) < 0) { | |
777 | reason = FAILURE_WINDOW_CLOSED; | |
778 | goto reject; | |
779 | } | |
780 | ||
781 | conn = session->leadconn; | |
782 | ||
60ecebf5 MC |
783 | if (!__kfifo_get(session->cmdpool.queue, (void*)&ctask, |
784 | sizeof(void*))) { | |
785 | reason = FAILURE_OOM; | |
786 | goto reject; | |
787 | } | |
7996a778 MC |
788 | sc->SCp.phase = session->age; |
789 | sc->SCp.ptr = (char *)ctask; | |
790 | ||
60ecebf5 | 791 | atomic_set(&ctask->refcount, 1); |
b6c395ed | 792 | ctask->state = ISCSI_TASK_PENDING; |
7996a778 MC |
793 | ctask->mtask = NULL; |
794 | ctask->conn = conn; | |
795 | ctask->sc = sc; | |
796 | INIT_LIST_HEAD(&ctask->running); | |
797 | ctask->total_length = sc->request_bufflen; | |
798 | iscsi_prep_scsi_cmd_pdu(ctask); | |
799 | ||
800 | session->tt->init_cmd_task(ctask); | |
801 | ||
b6c395ed | 802 | list_add_tail(&ctask->running, &conn->xmitqueue); |
7996a778 MC |
803 | debug_scsi( |
804 | "ctask enq [%s cid %d sc %lx itt 0x%x len %d cmdsn %d win %d]\n", | |
805 | sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read", | |
806 | conn->id, (long)sc, ctask->itt, sc->request_bufflen, | |
807 | session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1); | |
808 | spin_unlock(&session->lock); | |
809 | ||
810 | scsi_queue_work(host, &conn->xmitwork); | |
811 | return 0; | |
812 | ||
813 | reject: | |
814 | spin_unlock(&session->lock); | |
815 | debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason); | |
816 | return SCSI_MLQUEUE_HOST_BUSY; | |
817 | ||
818 | fault: | |
819 | spin_unlock(&session->lock); | |
be2df72e | 820 | printk(KERN_ERR "iscsi: cmd 0x%x is not queued (%d)\n", |
7996a778 MC |
821 | sc->cmnd[0], reason); |
822 | sc->result = (DID_NO_CONNECT << 16); | |
823 | sc->resid = sc->request_bufflen; | |
824 | sc->scsi_done(sc); | |
825 | return 0; | |
826 | } | |
827 | EXPORT_SYMBOL_GPL(iscsi_queuecommand); | |
828 | ||
829 | int iscsi_change_queue_depth(struct scsi_device *sdev, int depth) | |
830 | { | |
831 | if (depth > ISCSI_MAX_CMD_PER_LUN) | |
832 | depth = ISCSI_MAX_CMD_PER_LUN; | |
833 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); | |
834 | return sdev->queue_depth; | |
835 | } | |
836 | EXPORT_SYMBOL_GPL(iscsi_change_queue_depth); | |
837 | ||
838 | static int | |
839 | iscsi_conn_send_generic(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
840 | char *data, uint32_t data_size) | |
841 | { | |
842 | struct iscsi_session *session = conn->session; | |
843 | struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr; | |
844 | struct iscsi_mgmt_task *mtask; | |
845 | ||
846 | spin_lock_bh(&session->lock); | |
847 | if (session->state == ISCSI_STATE_TERMINATE) { | |
848 | spin_unlock_bh(&session->lock); | |
849 | return -EPERM; | |
850 | } | |
851 | if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) || | |
852 | hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE)) | |
853 | /* | |
854 | * Login and Text are sent serially, in | |
855 | * request-followed-by-response sequence. | |
856 | * Same mtask can be used. Same ITT must be used. | |
857 | * Note that login_mtask is preallocated at conn_create(). | |
858 | */ | |
859 | mtask = conn->login_mtask; | |
860 | else { | |
656cffc9 MC |
861 | BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE); |
862 | BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED); | |
7996a778 | 863 | |
8d2860b3 | 864 | nop->exp_statsn = cpu_to_be32(conn->exp_statsn); |
7996a778 MC |
865 | if (!__kfifo_get(session->mgmtpool.queue, |
866 | (void*)&mtask, sizeof(void*))) { | |
867 | spin_unlock_bh(&session->lock); | |
868 | return -ENOSPC; | |
869 | } | |
870 | } | |
871 | ||
872 | /* | |
8d2860b3 | 873 | * pre-format CmdSN for outgoing PDU. |
7996a778 MC |
874 | */ |
875 | if (hdr->itt != cpu_to_be32(ISCSI_RESERVED_TAG)) { | |
876 | hdr->itt = mtask->itt | (conn->id << ISCSI_CID_SHIFT) | | |
877 | (session->age << ISCSI_AGE_SHIFT); | |
878 | nop->cmdsn = cpu_to_be32(session->cmdsn); | |
879 | if (conn->c_stage == ISCSI_CONN_STARTED && | |
880 | !(hdr->opcode & ISCSI_OP_IMMEDIATE)) | |
881 | session->cmdsn++; | |
882 | } else | |
883 | /* do not advance CmdSN */ | |
884 | nop->cmdsn = cpu_to_be32(session->cmdsn); | |
885 | ||
7996a778 MC |
886 | if (data_size) { |
887 | memcpy(mtask->data, data, data_size); | |
888 | mtask->data_count = data_size; | |
889 | } else | |
890 | mtask->data_count = 0; | |
891 | ||
892 | INIT_LIST_HEAD(&mtask->running); | |
893 | memcpy(mtask->hdr, hdr, sizeof(struct iscsi_hdr)); | |
894 | if (session->tt->init_mgmt_task) | |
895 | session->tt->init_mgmt_task(conn, mtask, data, data_size); | |
896 | spin_unlock_bh(&session->lock); | |
897 | ||
898 | debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n", | |
899 | hdr->opcode, hdr->itt, data_size); | |
900 | ||
901 | /* | |
902 | * since send_pdu() could be called at least from two contexts, | |
903 | * we need to serialize __kfifo_put, so we don't have to take | |
904 | * additional lock on fast data-path | |
905 | */ | |
906 | if (hdr->opcode & ISCSI_OP_IMMEDIATE) | |
907 | __kfifo_put(conn->immqueue, (void*)&mtask, sizeof(void*)); | |
908 | else | |
909 | __kfifo_put(conn->mgmtqueue, (void*)&mtask, sizeof(void*)); | |
910 | ||
911 | scsi_queue_work(session->host, &conn->xmitwork); | |
912 | return 0; | |
913 | } | |
914 | ||
915 | int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr, | |
916 | char *data, uint32_t data_size) | |
917 | { | |
918 | struct iscsi_conn *conn = cls_conn->dd_data; | |
919 | int rc; | |
920 | ||
921 | mutex_lock(&conn->xmitmutex); | |
922 | rc = iscsi_conn_send_generic(conn, hdr, data, data_size); | |
923 | mutex_unlock(&conn->xmitmutex); | |
924 | ||
925 | return rc; | |
926 | } | |
927 | EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu); | |
928 | ||
929 | void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session) | |
930 | { | |
931 | struct iscsi_session *session = class_to_transport_session(cls_session); | |
932 | struct iscsi_conn *conn = session->leadconn; | |
933 | ||
934 | spin_lock_bh(&session->lock); | |
935 | if (session->state != ISCSI_STATE_LOGGED_IN) { | |
656cffc9 | 936 | session->state = ISCSI_STATE_RECOVERY_FAILED; |
7996a778 MC |
937 | if (conn) |
938 | wake_up(&conn->ehwait); | |
939 | } | |
940 | spin_unlock_bh(&session->lock); | |
941 | } | |
942 | EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout); | |
943 | ||
944 | int iscsi_eh_host_reset(struct scsi_cmnd *sc) | |
945 | { | |
946 | struct Scsi_Host *host = sc->device->host; | |
947 | struct iscsi_session *session = iscsi_hostdata(host->hostdata); | |
948 | struct iscsi_conn *conn = session->leadconn; | |
949 | int fail_session = 0; | |
950 | ||
951 | spin_lock_bh(&session->lock); | |
952 | if (session->state == ISCSI_STATE_TERMINATE) { | |
953 | failed: | |
954 | debug_scsi("failing host reset: session terminated " | |
955 | "[CID %d age %d]", conn->id, session->age); | |
956 | spin_unlock_bh(&session->lock); | |
957 | return FAILED; | |
958 | } | |
959 | ||
960 | if (sc->SCp.phase == session->age) { | |
961 | debug_scsi("failing connection CID %d due to SCSI host reset", | |
962 | conn->id); | |
963 | fail_session = 1; | |
964 | } | |
965 | spin_unlock_bh(&session->lock); | |
966 | ||
967 | /* | |
968 | * we drop the lock here but the leadconn cannot be destoyed while | |
969 | * we are in the scsi eh | |
970 | */ | |
656cffc9 | 971 | if (fail_session) |
7996a778 | 972 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
7996a778 MC |
973 | |
974 | debug_scsi("iscsi_eh_host_reset wait for relogin\n"); | |
975 | wait_event_interruptible(conn->ehwait, | |
976 | session->state == ISCSI_STATE_TERMINATE || | |
977 | session->state == ISCSI_STATE_LOGGED_IN || | |
656cffc9 | 978 | session->state == ISCSI_STATE_RECOVERY_FAILED); |
7996a778 MC |
979 | if (signal_pending(current)) |
980 | flush_signals(current); | |
981 | ||
982 | spin_lock_bh(&session->lock); | |
983 | if (session->state == ISCSI_STATE_LOGGED_IN) | |
be2df72e | 984 | printk(KERN_INFO "iscsi: host reset succeeded\n"); |
7996a778 MC |
985 | else |
986 | goto failed; | |
987 | spin_unlock_bh(&session->lock); | |
988 | ||
989 | return SUCCESS; | |
990 | } | |
991 | EXPORT_SYMBOL_GPL(iscsi_eh_host_reset); | |
992 | ||
993 | static void iscsi_tmabort_timedout(unsigned long data) | |
994 | { | |
995 | struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)data; | |
996 | struct iscsi_conn *conn = ctask->conn; | |
997 | struct iscsi_session *session = conn->session; | |
998 | ||
999 | spin_lock(&session->lock); | |
1000 | if (conn->tmabort_state == TMABORT_INITIAL) { | |
1001 | conn->tmabort_state = TMABORT_TIMEDOUT; | |
1002 | debug_scsi("tmabort timedout [sc %p itt 0x%x]\n", | |
1003 | ctask->sc, ctask->itt); | |
1004 | /* unblock eh_abort() */ | |
1005 | wake_up(&conn->ehwait); | |
1006 | } | |
1007 | spin_unlock(&session->lock); | |
1008 | } | |
1009 | ||
1010 | /* must be called with the mutex lock */ | |
1011 | static int iscsi_exec_abort_task(struct scsi_cmnd *sc, | |
1012 | struct iscsi_cmd_task *ctask) | |
1013 | { | |
1014 | struct iscsi_conn *conn = ctask->conn; | |
1015 | struct iscsi_session *session = conn->session; | |
1016 | struct iscsi_tm *hdr = &conn->tmhdr; | |
1017 | int rc; | |
1018 | ||
1019 | /* | |
1020 | * ctask timed out but session is OK requests must be serialized. | |
1021 | */ | |
1022 | memset(hdr, 0, sizeof(struct iscsi_tm)); | |
1023 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
1024 | hdr->flags = ISCSI_TM_FUNC_ABORT_TASK; | |
1025 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
1026 | memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); | |
1027 | hdr->rtt = ctask->hdr->itt; | |
1028 | hdr->refcmdsn = ctask->hdr->cmdsn; | |
1029 | ||
1030 | rc = iscsi_conn_send_generic(conn, (struct iscsi_hdr *)hdr, | |
1031 | NULL, 0); | |
1032 | if (rc) { | |
1033 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1034 | debug_scsi("abort sent failure [itt 0x%x] %d", ctask->itt, rc); | |
1035 | return rc; | |
1036 | } | |
1037 | ||
1038 | debug_scsi("abort sent [itt 0x%x]\n", ctask->itt); | |
1039 | ||
1040 | spin_lock_bh(&session->lock); | |
1041 | ctask->mtask = (struct iscsi_mgmt_task *) | |
1042 | session->mgmt_cmds[(hdr->itt & ISCSI_ITT_MASK) - | |
1043 | ISCSI_MGMT_ITT_OFFSET]; | |
1044 | ||
1045 | if (conn->tmabort_state == TMABORT_INITIAL) { | |
1046 | conn->tmfcmd_pdus_cnt++; | |
1047 | conn->tmabort_timer.expires = 10*HZ + jiffies; | |
1048 | conn->tmabort_timer.function = iscsi_tmabort_timedout; | |
1049 | conn->tmabort_timer.data = (unsigned long)ctask; | |
1050 | add_timer(&conn->tmabort_timer); | |
1051 | debug_scsi("abort set timeout [itt 0x%x]", ctask->itt); | |
1052 | } | |
1053 | spin_unlock_bh(&session->lock); | |
1054 | mutex_unlock(&conn->xmitmutex); | |
1055 | ||
1056 | /* | |
1057 | * block eh thread until: | |
1058 | * | |
1059 | * 1) abort response | |
1060 | * 2) abort timeout | |
1061 | * 3) session is terminated or restarted or userspace has | |
1062 | * given up on recovery | |
1063 | */ | |
1064 | wait_event_interruptible(conn->ehwait, | |
1065 | sc->SCp.phase != session->age || | |
1066 | session->state != ISCSI_STATE_LOGGED_IN || | |
656cffc9 | 1067 | conn->tmabort_state != TMABORT_INITIAL); |
7996a778 MC |
1068 | if (signal_pending(current)) |
1069 | flush_signals(current); | |
1070 | del_timer_sync(&conn->tmabort_timer); | |
1071 | ||
1072 | mutex_lock(&conn->xmitmutex); | |
1073 | return 0; | |
1074 | } | |
1075 | ||
1076 | /* | |
1077 | * xmit mutex and session lock must be held | |
1078 | */ | |
b6c395ed MC |
1079 | static struct iscsi_mgmt_task * |
1080 | iscsi_remove_mgmt_task(struct kfifo *fifo, uint32_t itt) | |
1081 | { | |
1082 | int i, nr_tasks = __kfifo_len(fifo) / sizeof(void*); | |
1083 | struct iscsi_mgmt_task *task; | |
1084 | ||
1085 | debug_scsi("searching %d tasks\n", nr_tasks); | |
1086 | ||
1087 | for (i = 0; i < nr_tasks; i++) { | |
1088 | __kfifo_get(fifo, (void*)&task, sizeof(void*)); | |
1089 | debug_scsi("check task %u\n", task->itt); | |
1090 | ||
1091 | if (task->itt == itt) { | |
1092 | debug_scsi("matched task\n"); | |
1093 | return task; | |
1094 | } | |
7996a778 | 1095 | |
b6c395ed MC |
1096 | __kfifo_put(fifo, (void*)&task, sizeof(void*)); |
1097 | } | |
1098 | return NULL; | |
1099 | } | |
7996a778 MC |
1100 | |
1101 | static int iscsi_ctask_mtask_cleanup(struct iscsi_cmd_task *ctask) | |
1102 | { | |
1103 | struct iscsi_conn *conn = ctask->conn; | |
1104 | struct iscsi_session *session = conn->session; | |
1105 | ||
1106 | if (!ctask->mtask) | |
1107 | return -EINVAL; | |
1108 | ||
1109 | if (!iscsi_remove_mgmt_task(conn->immqueue, ctask->mtask->itt)) | |
1110 | list_del(&ctask->mtask->running); | |
1111 | __kfifo_put(session->mgmtpool.queue, (void*)&ctask->mtask, | |
1112 | sizeof(void*)); | |
1113 | ctask->mtask = NULL; | |
1114 | return 0; | |
1115 | } | |
1116 | ||
1117 | /* | |
1118 | * session lock and xmitmutex must be held | |
1119 | */ | |
1120 | static void fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, | |
1121 | int err) | |
1122 | { | |
1123 | struct scsi_cmnd *sc; | |
1124 | ||
7996a778 MC |
1125 | sc = ctask->sc; |
1126 | if (!sc) | |
1127 | return; | |
7ea8b828 MC |
1128 | iscsi_ctask_mtask_cleanup(ctask); |
1129 | ||
7996a778 MC |
1130 | sc->result = err; |
1131 | sc->resid = sc->request_bufflen; | |
60ecebf5 | 1132 | __iscsi_put_ctask(ctask); |
7996a778 MC |
1133 | } |
1134 | ||
1135 | int iscsi_eh_abort(struct scsi_cmnd *sc) | |
1136 | { | |
1137 | struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)sc->SCp.ptr; | |
1138 | struct iscsi_conn *conn = ctask->conn; | |
1139 | struct iscsi_session *session = conn->session; | |
7996a778 MC |
1140 | int rc; |
1141 | ||
1142 | conn->eh_abort_cnt++; | |
1143 | debug_scsi("aborting [sc %p itt 0x%x]\n", sc, ctask->itt); | |
1144 | ||
1145 | mutex_lock(&conn->xmitmutex); | |
1146 | spin_lock_bh(&session->lock); | |
1147 | ||
1148 | /* | |
1149 | * If we are not logged in or we have started a new session | |
1150 | * then let the host reset code handle this | |
1151 | */ | |
1152 | if (session->state != ISCSI_STATE_LOGGED_IN || | |
1153 | sc->SCp.phase != session->age) | |
1154 | goto failed; | |
1155 | ||
1156 | /* ctask completed before time out */ | |
7ea8b828 MC |
1157 | if (!ctask->sc) { |
1158 | spin_unlock_bh(&session->lock); | |
1159 | debug_scsi("sc completed while abort in progress\n"); | |
1160 | goto success_rel_mutex; | |
1161 | } | |
7996a778 MC |
1162 | |
1163 | /* what should we do here ? */ | |
1164 | if (conn->ctask == ctask) { | |
be2df72e OG |
1165 | printk(KERN_INFO "iscsi: sc %p itt 0x%x partially sent. " |
1166 | "Failing abort\n", sc, ctask->itt); | |
7996a778 MC |
1167 | goto failed; |
1168 | } | |
1169 | ||
b6c395ed | 1170 | if (ctask->state == ISCSI_TASK_PENDING) |
7ea8b828 | 1171 | goto success_cleanup; |
7996a778 MC |
1172 | |
1173 | conn->tmabort_state = TMABORT_INITIAL; | |
1174 | ||
1175 | spin_unlock_bh(&session->lock); | |
1176 | rc = iscsi_exec_abort_task(sc, ctask); | |
1177 | spin_lock_bh(&session->lock); | |
1178 | ||
7996a778 MC |
1179 | if (rc || sc->SCp.phase != session->age || |
1180 | session->state != ISCSI_STATE_LOGGED_IN) | |
1181 | goto failed; | |
7ea8b828 | 1182 | iscsi_ctask_mtask_cleanup(ctask); |
7996a778 | 1183 | |
7ea8b828 MC |
1184 | switch (conn->tmabort_state) { |
1185 | case TMABORT_SUCCESS: | |
1186 | goto success_cleanup; | |
1187 | case TMABORT_NOT_FOUND: | |
1188 | if (!ctask->sc) { | |
1189 | /* ctask completed before tmf abort response */ | |
1190 | spin_unlock_bh(&session->lock); | |
1191 | debug_scsi("sc completed while abort in progress\n"); | |
1192 | goto success_rel_mutex; | |
1193 | } | |
1194 | /* fall through */ | |
1195 | default: | |
1196 | /* timedout or failed */ | |
7996a778 MC |
1197 | spin_unlock_bh(&session->lock); |
1198 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1199 | spin_lock_bh(&session->lock); | |
1200 | goto failed; | |
1201 | } | |
1202 | ||
7ea8b828 | 1203 | success_cleanup: |
7996a778 MC |
1204 | debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, ctask->itt); |
1205 | spin_unlock_bh(&session->lock); | |
1206 | ||
1207 | /* | |
1208 | * clean up task if aborted. we have the xmitmutex so grab | |
1209 | * the recv lock as a writer | |
1210 | */ | |
1211 | write_lock_bh(conn->recv_lock); | |
1212 | spin_lock(&session->lock); | |
1213 | fail_command(conn, ctask, DID_ABORT << 16); | |
1214 | spin_unlock(&session->lock); | |
1215 | write_unlock_bh(conn->recv_lock); | |
1216 | ||
7ea8b828 | 1217 | success_rel_mutex: |
7996a778 MC |
1218 | mutex_unlock(&conn->xmitmutex); |
1219 | return SUCCESS; | |
1220 | ||
1221 | failed: | |
1222 | spin_unlock_bh(&session->lock); | |
1223 | mutex_unlock(&conn->xmitmutex); | |
1224 | ||
1225 | debug_scsi("abort failed [sc %lx itt 0x%x]\n", (long)sc, ctask->itt); | |
1226 | return FAILED; | |
1227 | } | |
1228 | EXPORT_SYMBOL_GPL(iscsi_eh_abort); | |
1229 | ||
1230 | int | |
1231 | iscsi_pool_init(struct iscsi_queue *q, int max, void ***items, int item_size) | |
1232 | { | |
1233 | int i; | |
1234 | ||
1235 | *items = kmalloc(max * sizeof(void*), GFP_KERNEL); | |
1236 | if (*items == NULL) | |
1237 | return -ENOMEM; | |
1238 | ||
1239 | q->max = max; | |
1240 | q->pool = kmalloc(max * sizeof(void*), GFP_KERNEL); | |
1241 | if (q->pool == NULL) { | |
1242 | kfree(*items); | |
1243 | return -ENOMEM; | |
1244 | } | |
1245 | ||
1246 | q->queue = kfifo_init((void*)q->pool, max * sizeof(void*), | |
1247 | GFP_KERNEL, NULL); | |
1248 | if (q->queue == ERR_PTR(-ENOMEM)) { | |
1249 | kfree(q->pool); | |
1250 | kfree(*items); | |
1251 | return -ENOMEM; | |
1252 | } | |
1253 | ||
1254 | for (i = 0; i < max; i++) { | |
1255 | q->pool[i] = kmalloc(item_size, GFP_KERNEL); | |
1256 | if (q->pool[i] == NULL) { | |
1257 | int j; | |
1258 | ||
1259 | for (j = 0; j < i; j++) | |
1260 | kfree(q->pool[j]); | |
1261 | ||
1262 | kfifo_free(q->queue); | |
1263 | kfree(q->pool); | |
1264 | kfree(*items); | |
1265 | return -ENOMEM; | |
1266 | } | |
1267 | memset(q->pool[i], 0, item_size); | |
1268 | (*items)[i] = q->pool[i]; | |
1269 | __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*)); | |
1270 | } | |
1271 | return 0; | |
1272 | } | |
1273 | EXPORT_SYMBOL_GPL(iscsi_pool_init); | |
1274 | ||
1275 | void iscsi_pool_free(struct iscsi_queue *q, void **items) | |
1276 | { | |
1277 | int i; | |
1278 | ||
1279 | for (i = 0; i < q->max; i++) | |
1280 | kfree(items[i]); | |
1281 | kfree(q->pool); | |
1282 | kfree(items); | |
1283 | } | |
1284 | EXPORT_SYMBOL_GPL(iscsi_pool_free); | |
1285 | ||
1286 | /* | |
1287 | * iSCSI Session's hostdata organization: | |
1288 | * | |
1289 | * *------------------* <== hostdata_session(host->hostdata) | |
1290 | * | ptr to class sess| | |
1291 | * |------------------| <== iscsi_hostdata(host->hostdata) | |
1292 | * | iscsi_session | | |
1293 | * *------------------* | |
1294 | */ | |
1295 | ||
1296 | #define hostdata_privsize(_sz) (sizeof(unsigned long) + _sz + \ | |
1297 | _sz % sizeof(unsigned long)) | |
1298 | ||
1299 | #define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata)) | |
1300 | ||
1301 | /** | |
1302 | * iscsi_session_setup - create iscsi cls session and host and session | |
1303 | * @scsit: scsi transport template | |
1304 | * @iscsit: iscsi transport template | |
1305 | * @initial_cmdsn: initial CmdSN | |
1306 | * @hostno: host no allocated | |
1307 | * | |
1308 | * This can be used by software iscsi_transports that allocate | |
1309 | * a session per scsi host. | |
1310 | **/ | |
1311 | struct iscsi_cls_session * | |
1312 | iscsi_session_setup(struct iscsi_transport *iscsit, | |
1313 | struct scsi_transport_template *scsit, | |
1314 | int cmd_task_size, int mgmt_task_size, | |
1315 | uint32_t initial_cmdsn, uint32_t *hostno) | |
1316 | { | |
1317 | struct Scsi_Host *shost; | |
1318 | struct iscsi_session *session; | |
1319 | struct iscsi_cls_session *cls_session; | |
1320 | int cmd_i; | |
1321 | ||
1322 | shost = scsi_host_alloc(iscsit->host_template, | |
1323 | hostdata_privsize(sizeof(*session))); | |
1324 | if (!shost) | |
1325 | return NULL; | |
1326 | ||
1327 | shost->max_id = 1; | |
1328 | shost->max_channel = 0; | |
1329 | shost->max_lun = iscsit->max_lun; | |
1330 | shost->max_cmd_len = iscsit->max_cmd_len; | |
1331 | shost->transportt = scsit; | |
1332 | shost->transportt->create_work_queue = 1; | |
1333 | *hostno = shost->host_no; | |
1334 | ||
1335 | session = iscsi_hostdata(shost->hostdata); | |
1336 | memset(session, 0, sizeof(struct iscsi_session)); | |
1337 | session->host = shost; | |
1338 | session->state = ISCSI_STATE_FREE; | |
1339 | session->mgmtpool_max = ISCSI_MGMT_CMDS_MAX; | |
1340 | session->cmds_max = ISCSI_XMIT_CMDS_MAX; | |
1341 | session->cmdsn = initial_cmdsn; | |
1342 | session->exp_cmdsn = initial_cmdsn + 1; | |
1343 | session->max_cmdsn = initial_cmdsn + 1; | |
1344 | session->max_r2t = 1; | |
1345 | session->tt = iscsit; | |
1346 | ||
1347 | /* initialize SCSI PDU commands pool */ | |
1348 | if (iscsi_pool_init(&session->cmdpool, session->cmds_max, | |
1349 | (void***)&session->cmds, | |
1350 | cmd_task_size + sizeof(struct iscsi_cmd_task))) | |
1351 | goto cmdpool_alloc_fail; | |
1352 | ||
1353 | /* pre-format cmds pool with ITT */ | |
1354 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
1355 | struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; | |
1356 | ||
1357 | if (cmd_task_size) | |
1358 | ctask->dd_data = &ctask[1]; | |
1359 | ctask->itt = cmd_i; | |
b6c395ed | 1360 | INIT_LIST_HEAD(&ctask->running); |
7996a778 MC |
1361 | } |
1362 | ||
1363 | spin_lock_init(&session->lock); | |
1364 | INIT_LIST_HEAD(&session->connections); | |
1365 | ||
1366 | /* initialize immediate command pool */ | |
1367 | if (iscsi_pool_init(&session->mgmtpool, session->mgmtpool_max, | |
1368 | (void***)&session->mgmt_cmds, | |
1369 | mgmt_task_size + sizeof(struct iscsi_mgmt_task))) | |
1370 | goto mgmtpool_alloc_fail; | |
1371 | ||
1372 | ||
1373 | /* pre-format immediate cmds pool with ITT */ | |
1374 | for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) { | |
1375 | struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i]; | |
1376 | ||
1377 | if (mgmt_task_size) | |
1378 | mtask->dd_data = &mtask[1]; | |
1379 | mtask->itt = ISCSI_MGMT_ITT_OFFSET + cmd_i; | |
b6c395ed | 1380 | INIT_LIST_HEAD(&mtask->running); |
7996a778 MC |
1381 | } |
1382 | ||
1383 | if (scsi_add_host(shost, NULL)) | |
1384 | goto add_host_fail; | |
1385 | ||
f53a88da MC |
1386 | if (!try_module_get(iscsit->owner)) |
1387 | goto cls_session_fail; | |
1388 | ||
6a8a0d36 | 1389 | cls_session = iscsi_create_session(shost, iscsit, 0); |
7996a778 | 1390 | if (!cls_session) |
f53a88da | 1391 | goto module_put; |
7996a778 MC |
1392 | *(unsigned long*)shost->hostdata = (unsigned long)cls_session; |
1393 | ||
1394 | return cls_session; | |
1395 | ||
f53a88da MC |
1396 | module_put: |
1397 | module_put(iscsit->owner); | |
7996a778 MC |
1398 | cls_session_fail: |
1399 | scsi_remove_host(shost); | |
1400 | add_host_fail: | |
7996a778 MC |
1401 | iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds); |
1402 | mgmtpool_alloc_fail: | |
1403 | iscsi_pool_free(&session->cmdpool, (void**)session->cmds); | |
1404 | cmdpool_alloc_fail: | |
1405 | scsi_host_put(shost); | |
1406 | return NULL; | |
1407 | } | |
1408 | EXPORT_SYMBOL_GPL(iscsi_session_setup); | |
1409 | ||
1410 | /** | |
1411 | * iscsi_session_teardown - destroy session, host, and cls_session | |
1412 | * shost: scsi host | |
1413 | * | |
1414 | * This can be used by software iscsi_transports that allocate | |
1415 | * a session per scsi host. | |
1416 | **/ | |
1417 | void iscsi_session_teardown(struct iscsi_cls_session *cls_session) | |
1418 | { | |
1419 | struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); | |
1420 | struct iscsi_session *session = iscsi_hostdata(shost->hostdata); | |
63f75cc8 | 1421 | struct module *owner = cls_session->transport->owner; |
7996a778 MC |
1422 | |
1423 | scsi_remove_host(shost); | |
1424 | ||
7996a778 MC |
1425 | iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds); |
1426 | iscsi_pool_free(&session->cmdpool, (void**)session->cmds); | |
1427 | ||
f3ff0c36 MC |
1428 | kfree(session->targetname); |
1429 | ||
7996a778 MC |
1430 | iscsi_destroy_session(cls_session); |
1431 | scsi_host_put(shost); | |
63f75cc8 | 1432 | module_put(owner); |
7996a778 MC |
1433 | } |
1434 | EXPORT_SYMBOL_GPL(iscsi_session_teardown); | |
1435 | ||
1436 | /** | |
1437 | * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn | |
1438 | * @cls_session: iscsi_cls_session | |
1439 | * @conn_idx: cid | |
1440 | **/ | |
1441 | struct iscsi_cls_conn * | |
1442 | iscsi_conn_setup(struct iscsi_cls_session *cls_session, uint32_t conn_idx) | |
1443 | { | |
1444 | struct iscsi_session *session = class_to_transport_session(cls_session); | |
1445 | struct iscsi_conn *conn; | |
1446 | struct iscsi_cls_conn *cls_conn; | |
d36ab6f3 | 1447 | char *data; |
7996a778 MC |
1448 | |
1449 | cls_conn = iscsi_create_conn(cls_session, conn_idx); | |
1450 | if (!cls_conn) | |
1451 | return NULL; | |
1452 | conn = cls_conn->dd_data; | |
1453 | memset(conn, 0, sizeof(*conn)); | |
1454 | ||
1455 | conn->session = session; | |
1456 | conn->cls_conn = cls_conn; | |
1457 | conn->c_stage = ISCSI_CONN_INITIAL_STAGE; | |
1458 | conn->id = conn_idx; | |
1459 | conn->exp_statsn = 0; | |
1460 | conn->tmabort_state = TMABORT_INITIAL; | |
1461 | INIT_LIST_HEAD(&conn->run_list); | |
1462 | INIT_LIST_HEAD(&conn->mgmt_run_list); | |
b6c395ed | 1463 | INIT_LIST_HEAD(&conn->xmitqueue); |
7996a778 MC |
1464 | |
1465 | /* initialize general immediate & non-immediate PDU commands queue */ | |
1466 | conn->immqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*), | |
1467 | GFP_KERNEL, NULL); | |
1468 | if (conn->immqueue == ERR_PTR(-ENOMEM)) | |
1469 | goto immqueue_alloc_fail; | |
1470 | ||
1471 | conn->mgmtqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*), | |
1472 | GFP_KERNEL, NULL); | |
1473 | if (conn->mgmtqueue == ERR_PTR(-ENOMEM)) | |
1474 | goto mgmtqueue_alloc_fail; | |
1475 | ||
1476 | INIT_WORK(&conn->xmitwork, iscsi_xmitworker, conn); | |
1477 | ||
1478 | /* allocate login_mtask used for the login/text sequences */ | |
1479 | spin_lock_bh(&session->lock); | |
1480 | if (!__kfifo_get(session->mgmtpool.queue, | |
1481 | (void*)&conn->login_mtask, | |
1482 | sizeof(void*))) { | |
1483 | spin_unlock_bh(&session->lock); | |
1484 | goto login_mtask_alloc_fail; | |
1485 | } | |
1486 | spin_unlock_bh(&session->lock); | |
1487 | ||
d36ab6f3 MC |
1488 | data = kmalloc(DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH, GFP_KERNEL); |
1489 | if (!data) | |
1490 | goto login_mtask_data_alloc_fail; | |
c8dc1e52 | 1491 | conn->login_mtask->data = conn->data = data; |
d36ab6f3 | 1492 | |
7996a778 MC |
1493 | init_timer(&conn->tmabort_timer); |
1494 | mutex_init(&conn->xmitmutex); | |
1495 | init_waitqueue_head(&conn->ehwait); | |
1496 | ||
1497 | return cls_conn; | |
1498 | ||
d36ab6f3 MC |
1499 | login_mtask_data_alloc_fail: |
1500 | __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask, | |
1501 | sizeof(void*)); | |
7996a778 MC |
1502 | login_mtask_alloc_fail: |
1503 | kfifo_free(conn->mgmtqueue); | |
1504 | mgmtqueue_alloc_fail: | |
1505 | kfifo_free(conn->immqueue); | |
1506 | immqueue_alloc_fail: | |
7996a778 MC |
1507 | iscsi_destroy_conn(cls_conn); |
1508 | return NULL; | |
1509 | } | |
1510 | EXPORT_SYMBOL_GPL(iscsi_conn_setup); | |
1511 | ||
1512 | /** | |
1513 | * iscsi_conn_teardown - teardown iscsi connection | |
1514 | * cls_conn: iscsi class connection | |
1515 | * | |
1516 | * TODO: we may need to make this into a two step process | |
1517 | * like scsi-mls remove + put host | |
1518 | */ | |
1519 | void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn) | |
1520 | { | |
1521 | struct iscsi_conn *conn = cls_conn->dd_data; | |
1522 | struct iscsi_session *session = conn->session; | |
1523 | unsigned long flags; | |
1524 | ||
7996a778 | 1525 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); |
67a61114 | 1526 | mutex_lock(&conn->xmitmutex); |
7996a778 MC |
1527 | |
1528 | spin_lock_bh(&session->lock); | |
1529 | conn->c_stage = ISCSI_CONN_CLEANUP_WAIT; | |
1530 | if (session->leadconn == conn) { | |
1531 | /* | |
1532 | * leading connection? then give up on recovery. | |
1533 | */ | |
1534 | session->state = ISCSI_STATE_TERMINATE; | |
1535 | wake_up(&conn->ehwait); | |
1536 | } | |
1537 | spin_unlock_bh(&session->lock); | |
1538 | ||
1539 | mutex_unlock(&conn->xmitmutex); | |
1540 | ||
1541 | /* | |
1542 | * Block until all in-progress commands for this connection | |
1543 | * time out or fail. | |
1544 | */ | |
1545 | for (;;) { | |
1546 | spin_lock_irqsave(session->host->host_lock, flags); | |
1547 | if (!session->host->host_busy) { /* OK for ERL == 0 */ | |
1548 | spin_unlock_irqrestore(session->host->host_lock, flags); | |
1549 | break; | |
1550 | } | |
1551 | spin_unlock_irqrestore(session->host->host_lock, flags); | |
1552 | msleep_interruptible(500); | |
be2df72e OG |
1553 | printk(KERN_INFO "iscsi: scsi conn_destroy(): host_busy %d " |
1554 | "host_failed %d\n", session->host->host_busy, | |
1555 | session->host->host_failed); | |
7996a778 MC |
1556 | /* |
1557 | * force eh_abort() to unblock | |
1558 | */ | |
1559 | wake_up(&conn->ehwait); | |
1560 | } | |
1561 | ||
1562 | spin_lock_bh(&session->lock); | |
c8dc1e52 | 1563 | kfree(conn->data); |
f3ff0c36 | 1564 | kfree(conn->persistent_address); |
7996a778 MC |
1565 | __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask, |
1566 | sizeof(void*)); | |
1567 | list_del(&conn->item); | |
1568 | if (list_empty(&session->connections)) | |
1569 | session->leadconn = NULL; | |
1570 | if (session->leadconn && session->leadconn == conn) | |
1571 | session->leadconn = container_of(session->connections.next, | |
1572 | struct iscsi_conn, item); | |
1573 | ||
1574 | if (session->leadconn == NULL) | |
1575 | /* no connections exits.. reset sequencing */ | |
1576 | session->cmdsn = session->max_cmdsn = session->exp_cmdsn = 1; | |
1577 | spin_unlock_bh(&session->lock); | |
1578 | ||
7996a778 MC |
1579 | kfifo_free(conn->immqueue); |
1580 | kfifo_free(conn->mgmtqueue); | |
1581 | ||
1582 | iscsi_destroy_conn(cls_conn); | |
1583 | } | |
1584 | EXPORT_SYMBOL_GPL(iscsi_conn_teardown); | |
1585 | ||
1586 | int iscsi_conn_start(struct iscsi_cls_conn *cls_conn) | |
1587 | { | |
1588 | struct iscsi_conn *conn = cls_conn->dd_data; | |
1589 | struct iscsi_session *session = conn->session; | |
1590 | ||
ffd0436e | 1591 | if (!session) { |
7996a778 MC |
1592 | printk(KERN_ERR "iscsi: can't start unbound connection\n"); |
1593 | return -EPERM; | |
1594 | } | |
1595 | ||
ffd0436e MC |
1596 | if (session->first_burst > session->max_burst) { |
1597 | printk("iscsi: invalid burst lengths: " | |
1598 | "first_burst %d max_burst %d\n", | |
1599 | session->first_burst, session->max_burst); | |
1600 | return -EINVAL; | |
1601 | } | |
1602 | ||
7996a778 MC |
1603 | spin_lock_bh(&session->lock); |
1604 | conn->c_stage = ISCSI_CONN_STARTED; | |
1605 | session->state = ISCSI_STATE_LOGGED_IN; | |
1606 | ||
1607 | switch(conn->stop_stage) { | |
1608 | case STOP_CONN_RECOVER: | |
1609 | /* | |
1610 | * unblock eh_abort() if it is blocked. re-try all | |
1611 | * commands after successful recovery | |
1612 | */ | |
7996a778 MC |
1613 | conn->stop_stage = 0; |
1614 | conn->tmabort_state = TMABORT_INITIAL; | |
1615 | session->age++; | |
7996a778 MC |
1616 | spin_unlock_bh(&session->lock); |
1617 | ||
1618 | iscsi_unblock_session(session_to_cls(session)); | |
1619 | wake_up(&conn->ehwait); | |
1620 | return 0; | |
1621 | case STOP_CONN_TERM: | |
7996a778 | 1622 | conn->stop_stage = 0; |
7996a778 MC |
1623 | break; |
1624 | default: | |
1625 | break; | |
1626 | } | |
1627 | spin_unlock_bh(&session->lock); | |
1628 | ||
1629 | return 0; | |
1630 | } | |
1631 | EXPORT_SYMBOL_GPL(iscsi_conn_start); | |
1632 | ||
1633 | static void | |
1634 | flush_control_queues(struct iscsi_session *session, struct iscsi_conn *conn) | |
1635 | { | |
1636 | struct iscsi_mgmt_task *mtask, *tmp; | |
1637 | ||
1638 | /* handle pending */ | |
1639 | while (__kfifo_get(conn->immqueue, (void*)&mtask, sizeof(void*)) || | |
1640 | __kfifo_get(conn->mgmtqueue, (void*)&mtask, sizeof(void*))) { | |
1641 | if (mtask == conn->login_mtask) | |
1642 | continue; | |
1643 | debug_scsi("flushing pending mgmt task itt 0x%x\n", mtask->itt); | |
1644 | __kfifo_put(session->mgmtpool.queue, (void*)&mtask, | |
1645 | sizeof(void*)); | |
1646 | } | |
1647 | ||
1648 | /* handle running */ | |
1649 | list_for_each_entry_safe(mtask, tmp, &conn->mgmt_run_list, running) { | |
1650 | debug_scsi("flushing running mgmt task itt 0x%x\n", mtask->itt); | |
ed2abc7f MC |
1651 | list_del(&mtask->running); |
1652 | ||
7996a778 MC |
1653 | if (mtask == conn->login_mtask) |
1654 | continue; | |
ed2abc7f | 1655 | __kfifo_put(session->mgmtpool.queue, (void*)&mtask, |
7996a778 MC |
1656 | sizeof(void*)); |
1657 | } | |
1658 | ||
1659 | conn->mtask = NULL; | |
1660 | } | |
1661 | ||
1662 | /* Fail commands. Mutex and session lock held and recv side suspended */ | |
1663 | static void fail_all_commands(struct iscsi_conn *conn) | |
1664 | { | |
1665 | struct iscsi_cmd_task *ctask, *tmp; | |
1666 | ||
1667 | /* flush pending */ | |
b6c395ed | 1668 | list_for_each_entry_safe(ctask, tmp, &conn->xmitqueue, running) { |
7996a778 MC |
1669 | debug_scsi("failing pending sc %p itt 0x%x\n", ctask->sc, |
1670 | ctask->itt); | |
1671 | fail_command(conn, ctask, DID_BUS_BUSY << 16); | |
1672 | } | |
1673 | ||
1674 | /* fail all other running */ | |
1675 | list_for_each_entry_safe(ctask, tmp, &conn->run_list, running) { | |
1676 | debug_scsi("failing in progress sc %p itt 0x%x\n", | |
1677 | ctask->sc, ctask->itt); | |
1678 | fail_command(conn, ctask, DID_BUS_BUSY << 16); | |
1679 | } | |
1680 | ||
1681 | conn->ctask = NULL; | |
1682 | } | |
1683 | ||
656cffc9 MC |
1684 | static void iscsi_start_session_recovery(struct iscsi_session *session, |
1685 | struct iscsi_conn *conn, int flag) | |
7996a778 | 1686 | { |
ed2abc7f MC |
1687 | int old_stop_stage; |
1688 | ||
7996a778 | 1689 | spin_lock_bh(&session->lock); |
ed2abc7f | 1690 | if (conn->stop_stage == STOP_CONN_TERM) { |
7996a778 MC |
1691 | spin_unlock_bh(&session->lock); |
1692 | return; | |
1693 | } | |
ed2abc7f MC |
1694 | |
1695 | /* | |
1696 | * When this is called for the in_login state, we only want to clean | |
67a61114 MC |
1697 | * up the login task and connection. We do not need to block and set |
1698 | * the recovery state again | |
ed2abc7f | 1699 | */ |
67a61114 MC |
1700 | if (flag == STOP_CONN_TERM) |
1701 | session->state = ISCSI_STATE_TERMINATE; | |
1702 | else if (conn->stop_stage != STOP_CONN_RECOVER) | |
1703 | session->state = ISCSI_STATE_IN_RECOVERY; | |
ed2abc7f MC |
1704 | |
1705 | old_stop_stage = conn->stop_stage; | |
7996a778 | 1706 | conn->stop_stage = flag; |
67a61114 MC |
1707 | conn->c_stage = ISCSI_CONN_STOPPED; |
1708 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
7996a778 MC |
1709 | spin_unlock_bh(&session->lock); |
1710 | ||
1c83469d MC |
1711 | write_lock_bh(conn->recv_lock); |
1712 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
1713 | write_unlock_bh(conn->recv_lock); | |
7996a778 MC |
1714 | |
1715 | mutex_lock(&conn->xmitmutex); | |
7996a778 MC |
1716 | /* |
1717 | * for connection level recovery we should not calculate | |
1718 | * header digest. conn->hdr_size used for optimization | |
1719 | * in hdr_extract() and will be re-negotiated at | |
1720 | * set_param() time. | |
1721 | */ | |
1722 | if (flag == STOP_CONN_RECOVER) { | |
1723 | conn->hdrdgst_en = 0; | |
1724 | conn->datadgst_en = 0; | |
656cffc9 | 1725 | if (session->state == ISCSI_STATE_IN_RECOVERY && |
67a61114 MC |
1726 | old_stop_stage != STOP_CONN_RECOVER) { |
1727 | debug_scsi("blocking session\n"); | |
7996a778 | 1728 | iscsi_block_session(session_to_cls(session)); |
67a61114 | 1729 | } |
7996a778 | 1730 | } |
656cffc9 | 1731 | |
656cffc9 MC |
1732 | /* |
1733 | * flush queues. | |
1734 | */ | |
1735 | spin_lock_bh(&session->lock); | |
1736 | fail_all_commands(conn); | |
1737 | flush_control_queues(session, conn); | |
1738 | spin_unlock_bh(&session->lock); | |
1739 | ||
7996a778 MC |
1740 | mutex_unlock(&conn->xmitmutex); |
1741 | } | |
7996a778 MC |
1742 | |
1743 | void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) | |
1744 | { | |
1745 | struct iscsi_conn *conn = cls_conn->dd_data; | |
1746 | struct iscsi_session *session = conn->session; | |
1747 | ||
1748 | switch (flag) { | |
1749 | case STOP_CONN_RECOVER: | |
1750 | case STOP_CONN_TERM: | |
1751 | iscsi_start_session_recovery(session, conn, flag); | |
8d2860b3 | 1752 | break; |
7996a778 | 1753 | default: |
be2df72e | 1754 | printk(KERN_ERR "iscsi: invalid stop flag %d\n", flag); |
7996a778 MC |
1755 | } |
1756 | } | |
1757 | EXPORT_SYMBOL_GPL(iscsi_conn_stop); | |
1758 | ||
1759 | int iscsi_conn_bind(struct iscsi_cls_session *cls_session, | |
1760 | struct iscsi_cls_conn *cls_conn, int is_leading) | |
1761 | { | |
1762 | struct iscsi_session *session = class_to_transport_session(cls_session); | |
1763 | struct iscsi_conn *tmp = ERR_PTR(-EEXIST), *conn = cls_conn->dd_data; | |
1764 | ||
1765 | /* lookup for existing connection */ | |
1766 | spin_lock_bh(&session->lock); | |
1767 | list_for_each_entry(tmp, &session->connections, item) { | |
1768 | if (tmp == conn) { | |
1769 | if (conn->c_stage != ISCSI_CONN_STOPPED || | |
1770 | conn->stop_stage == STOP_CONN_TERM) { | |
be2df72e | 1771 | printk(KERN_ERR "iscsi: can't bind " |
7996a778 MC |
1772 | "non-stopped connection (%d:%d)\n", |
1773 | conn->c_stage, conn->stop_stage); | |
1774 | spin_unlock_bh(&session->lock); | |
1775 | return -EIO; | |
1776 | } | |
1777 | break; | |
1778 | } | |
1779 | } | |
1780 | if (tmp != conn) { | |
1781 | /* bind new iSCSI connection to session */ | |
1782 | conn->session = session; | |
1783 | list_add(&conn->item, &session->connections); | |
1784 | } | |
1785 | spin_unlock_bh(&session->lock); | |
1786 | ||
1787 | if (is_leading) | |
1788 | session->leadconn = conn; | |
1789 | ||
1790 | /* | |
1791 | * Unblock xmitworker(), Login Phase will pass through. | |
1792 | */ | |
1793 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
1794 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
1795 | return 0; | |
1796 | } | |
1797 | EXPORT_SYMBOL_GPL(iscsi_conn_bind); | |
1798 | ||
a54a52ca MC |
1799 | |
1800 | int iscsi_set_param(struct iscsi_cls_conn *cls_conn, | |
1801 | enum iscsi_param param, char *buf, int buflen) | |
1802 | { | |
1803 | struct iscsi_conn *conn = cls_conn->dd_data; | |
1804 | struct iscsi_session *session = conn->session; | |
1805 | uint32_t value; | |
1806 | ||
1807 | switch(param) { | |
1808 | case ISCSI_PARAM_MAX_RECV_DLENGTH: | |
1809 | sscanf(buf, "%d", &conn->max_recv_dlength); | |
1810 | break; | |
1811 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
1812 | sscanf(buf, "%d", &conn->max_xmit_dlength); | |
1813 | break; | |
1814 | case ISCSI_PARAM_HDRDGST_EN: | |
1815 | sscanf(buf, "%d", &conn->hdrdgst_en); | |
1816 | break; | |
1817 | case ISCSI_PARAM_DATADGST_EN: | |
1818 | sscanf(buf, "%d", &conn->datadgst_en); | |
1819 | break; | |
1820 | case ISCSI_PARAM_INITIAL_R2T_EN: | |
1821 | sscanf(buf, "%d", &session->initial_r2t_en); | |
1822 | break; | |
1823 | case ISCSI_PARAM_MAX_R2T: | |
1824 | sscanf(buf, "%d", &session->max_r2t); | |
1825 | break; | |
1826 | case ISCSI_PARAM_IMM_DATA_EN: | |
1827 | sscanf(buf, "%d", &session->imm_data_en); | |
1828 | break; | |
1829 | case ISCSI_PARAM_FIRST_BURST: | |
1830 | sscanf(buf, "%d", &session->first_burst); | |
1831 | break; | |
1832 | case ISCSI_PARAM_MAX_BURST: | |
1833 | sscanf(buf, "%d", &session->max_burst); | |
1834 | break; | |
1835 | case ISCSI_PARAM_PDU_INORDER_EN: | |
1836 | sscanf(buf, "%d", &session->pdu_inorder_en); | |
1837 | break; | |
1838 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
1839 | sscanf(buf, "%d", &session->dataseq_inorder_en); | |
1840 | break; | |
1841 | case ISCSI_PARAM_ERL: | |
1842 | sscanf(buf, "%d", &session->erl); | |
1843 | break; | |
1844 | case ISCSI_PARAM_IFMARKER_EN: | |
1845 | sscanf(buf, "%d", &value); | |
1846 | BUG_ON(value); | |
1847 | break; | |
1848 | case ISCSI_PARAM_OFMARKER_EN: | |
1849 | sscanf(buf, "%d", &value); | |
1850 | BUG_ON(value); | |
1851 | break; | |
1852 | case ISCSI_PARAM_EXP_STATSN: | |
1853 | sscanf(buf, "%u", &conn->exp_statsn); | |
1854 | break; | |
1855 | case ISCSI_PARAM_TARGET_NAME: | |
1856 | /* this should not change between logins */ | |
1857 | if (session->targetname) | |
1858 | break; | |
1859 | ||
1860 | session->targetname = kstrdup(buf, GFP_KERNEL); | |
1861 | if (!session->targetname) | |
1862 | return -ENOMEM; | |
1863 | break; | |
1864 | case ISCSI_PARAM_TPGT: | |
1865 | sscanf(buf, "%d", &session->tpgt); | |
1866 | break; | |
1867 | case ISCSI_PARAM_PERSISTENT_PORT: | |
1868 | sscanf(buf, "%d", &conn->persistent_port); | |
1869 | break; | |
1870 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
1871 | /* | |
1872 | * this is the address returned in discovery so it should | |
1873 | * not change between logins. | |
1874 | */ | |
1875 | if (conn->persistent_address) | |
1876 | break; | |
1877 | ||
1878 | conn->persistent_address = kstrdup(buf, GFP_KERNEL); | |
1879 | if (!conn->persistent_address) | |
1880 | return -ENOMEM; | |
1881 | break; | |
1882 | default: | |
1883 | return -ENOSYS; | |
1884 | } | |
1885 | ||
1886 | return 0; | |
1887 | } | |
1888 | EXPORT_SYMBOL_GPL(iscsi_set_param); | |
1889 | ||
1890 | int iscsi_session_get_param(struct iscsi_cls_session *cls_session, | |
1891 | enum iscsi_param param, char *buf) | |
1892 | { | |
1893 | struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); | |
1894 | struct iscsi_session *session = iscsi_hostdata(shost->hostdata); | |
1895 | int len; | |
1896 | ||
1897 | switch(param) { | |
1898 | case ISCSI_PARAM_INITIAL_R2T_EN: | |
1899 | len = sprintf(buf, "%d\n", session->initial_r2t_en); | |
1900 | break; | |
1901 | case ISCSI_PARAM_MAX_R2T: | |
1902 | len = sprintf(buf, "%hu\n", session->max_r2t); | |
1903 | break; | |
1904 | case ISCSI_PARAM_IMM_DATA_EN: | |
1905 | len = sprintf(buf, "%d\n", session->imm_data_en); | |
1906 | break; | |
1907 | case ISCSI_PARAM_FIRST_BURST: | |
1908 | len = sprintf(buf, "%u\n", session->first_burst); | |
1909 | break; | |
1910 | case ISCSI_PARAM_MAX_BURST: | |
1911 | len = sprintf(buf, "%u\n", session->max_burst); | |
1912 | break; | |
1913 | case ISCSI_PARAM_PDU_INORDER_EN: | |
1914 | len = sprintf(buf, "%d\n", session->pdu_inorder_en); | |
1915 | break; | |
1916 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
1917 | len = sprintf(buf, "%d\n", session->dataseq_inorder_en); | |
1918 | break; | |
1919 | case ISCSI_PARAM_ERL: | |
1920 | len = sprintf(buf, "%d\n", session->erl); | |
1921 | break; | |
1922 | case ISCSI_PARAM_TARGET_NAME: | |
1923 | len = sprintf(buf, "%s\n", session->targetname); | |
1924 | break; | |
1925 | case ISCSI_PARAM_TPGT: | |
1926 | len = sprintf(buf, "%d\n", session->tpgt); | |
1927 | break; | |
1928 | default: | |
1929 | return -ENOSYS; | |
1930 | } | |
1931 | ||
1932 | return len; | |
1933 | } | |
1934 | EXPORT_SYMBOL_GPL(iscsi_session_get_param); | |
1935 | ||
1936 | int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn, | |
1937 | enum iscsi_param param, char *buf) | |
1938 | { | |
1939 | struct iscsi_conn *conn = cls_conn->dd_data; | |
1940 | int len; | |
1941 | ||
1942 | switch(param) { | |
1943 | case ISCSI_PARAM_MAX_RECV_DLENGTH: | |
1944 | len = sprintf(buf, "%u\n", conn->max_recv_dlength); | |
1945 | break; | |
1946 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
1947 | len = sprintf(buf, "%u\n", conn->max_xmit_dlength); | |
1948 | break; | |
1949 | case ISCSI_PARAM_HDRDGST_EN: | |
1950 | len = sprintf(buf, "%d\n", conn->hdrdgst_en); | |
1951 | break; | |
1952 | case ISCSI_PARAM_DATADGST_EN: | |
1953 | len = sprintf(buf, "%d\n", conn->datadgst_en); | |
1954 | break; | |
1955 | case ISCSI_PARAM_IFMARKER_EN: | |
1956 | len = sprintf(buf, "%d\n", conn->ifmarker_en); | |
1957 | break; | |
1958 | case ISCSI_PARAM_OFMARKER_EN: | |
1959 | len = sprintf(buf, "%d\n", conn->ofmarker_en); | |
1960 | break; | |
1961 | case ISCSI_PARAM_EXP_STATSN: | |
1962 | len = sprintf(buf, "%u\n", conn->exp_statsn); | |
1963 | break; | |
1964 | case ISCSI_PARAM_PERSISTENT_PORT: | |
1965 | len = sprintf(buf, "%d\n", conn->persistent_port); | |
1966 | break; | |
1967 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
1968 | len = sprintf(buf, "%s\n", conn->persistent_address); | |
1969 | break; | |
1970 | default: | |
1971 | return -ENOSYS; | |
1972 | } | |
1973 | ||
1974 | return len; | |
1975 | } | |
1976 | EXPORT_SYMBOL_GPL(iscsi_conn_get_param); | |
1977 | ||
7996a778 MC |
1978 | MODULE_AUTHOR("Mike Christie"); |
1979 | MODULE_DESCRIPTION("iSCSI library functions"); | |
1980 | MODULE_LICENSE("GPL"); |