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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> | |
8eb00539 | 28 | #include <asm/unaligned.h> |
7996a778 MC |
29 | #include <net/tcp.h> |
30 | #include <scsi/scsi_cmnd.h> | |
31 | #include <scsi/scsi_device.h> | |
32 | #include <scsi/scsi_eh.h> | |
33 | #include <scsi/scsi_tcq.h> | |
34 | #include <scsi/scsi_host.h> | |
35 | #include <scsi/scsi.h> | |
36 | #include <scsi/iscsi_proto.h> | |
37 | #include <scsi/scsi_transport.h> | |
38 | #include <scsi/scsi_transport_iscsi.h> | |
39 | #include <scsi/libiscsi.h> | |
40 | ||
41 | struct iscsi_session * | |
42 | class_to_transport_session(struct iscsi_cls_session *cls_session) | |
43 | { | |
44 | struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); | |
45 | return iscsi_hostdata(shost->hostdata); | |
46 | } | |
47 | EXPORT_SYMBOL_GPL(class_to_transport_session); | |
48 | ||
49 | #define INVALID_SN_DELTA 0xffff | |
50 | ||
51 | int | |
52 | iscsi_check_assign_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr) | |
53 | { | |
54 | uint32_t max_cmdsn = be32_to_cpu(hdr->max_cmdsn); | |
55 | uint32_t exp_cmdsn = be32_to_cpu(hdr->exp_cmdsn); | |
56 | ||
57 | if (max_cmdsn < exp_cmdsn -1 && | |
58 | max_cmdsn > exp_cmdsn - INVALID_SN_DELTA) | |
59 | return ISCSI_ERR_MAX_CMDSN; | |
60 | if (max_cmdsn > session->max_cmdsn || | |
61 | max_cmdsn < session->max_cmdsn - INVALID_SN_DELTA) | |
62 | session->max_cmdsn = max_cmdsn; | |
63 | if (exp_cmdsn > session->exp_cmdsn || | |
64 | exp_cmdsn < session->exp_cmdsn - INVALID_SN_DELTA) | |
65 | session->exp_cmdsn = exp_cmdsn; | |
66 | ||
67 | return 0; | |
68 | } | |
69 | EXPORT_SYMBOL_GPL(iscsi_check_assign_cmdsn); | |
70 | ||
71 | void iscsi_prep_unsolicit_data_pdu(struct iscsi_cmd_task *ctask, | |
ffd0436e | 72 | struct iscsi_data *hdr) |
7996a778 MC |
73 | { |
74 | struct iscsi_conn *conn = ctask->conn; | |
75 | ||
76 | memset(hdr, 0, sizeof(struct iscsi_data)); | |
77 | hdr->ttt = cpu_to_be32(ISCSI_RESERVED_TAG); | |
78 | hdr->datasn = cpu_to_be32(ctask->unsol_datasn); | |
79 | ctask->unsol_datasn++; | |
80 | hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; | |
81 | memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); | |
82 | ||
83 | hdr->itt = ctask->hdr->itt; | |
84 | hdr->exp_statsn = cpu_to_be32(conn->exp_statsn); | |
ffd0436e | 85 | hdr->offset = cpu_to_be32(ctask->unsol_offset); |
7996a778 MC |
86 | |
87 | if (ctask->unsol_count > conn->max_xmit_dlength) { | |
88 | hton24(hdr->dlength, conn->max_xmit_dlength); | |
89 | ctask->data_count = conn->max_xmit_dlength; | |
ffd0436e | 90 | ctask->unsol_offset += ctask->data_count; |
7996a778 MC |
91 | hdr->flags = 0; |
92 | } else { | |
93 | hton24(hdr->dlength, ctask->unsol_count); | |
94 | ctask->data_count = ctask->unsol_count; | |
95 | hdr->flags = ISCSI_FLAG_CMD_FINAL; | |
96 | } | |
97 | } | |
98 | EXPORT_SYMBOL_GPL(iscsi_prep_unsolicit_data_pdu); | |
99 | ||
100 | /** | |
101 | * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu | |
102 | * @ctask: iscsi cmd task | |
103 | * | |
104 | * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set | |
105 | * fields like dlength or final based on how much data it sends | |
106 | */ | |
107 | static void iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask) | |
108 | { | |
109 | struct iscsi_conn *conn = ctask->conn; | |
110 | struct iscsi_session *session = conn->session; | |
111 | struct iscsi_cmd *hdr = ctask->hdr; | |
112 | struct scsi_cmnd *sc = ctask->sc; | |
113 | ||
114 | hdr->opcode = ISCSI_OP_SCSI_CMD; | |
115 | hdr->flags = ISCSI_ATTR_SIMPLE; | |
116 | int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun); | |
b4377356 | 117 | hdr->itt = build_itt(ctask->itt, conn->id, session->age); |
7996a778 MC |
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 | 194 | ctask->sc = NULL; |
f47f2cf5 MC |
195 | /* SCSI eh reuses commands to verify us */ |
196 | sc->SCp.ptr = NULL; | |
7996a778 MC |
197 | list_del_init(&ctask->running); |
198 | __kfifo_put(session->cmdpool.queue, (void*)&ctask, sizeof(void*)); | |
199 | sc->scsi_done(sc); | |
200 | } | |
201 | ||
60ecebf5 MC |
202 | static void __iscsi_get_ctask(struct iscsi_cmd_task *ctask) |
203 | { | |
204 | atomic_inc(&ctask->refcount); | |
205 | } | |
206 | ||
207 | static void iscsi_get_ctask(struct iscsi_cmd_task *ctask) | |
208 | { | |
209 | spin_lock_bh(&ctask->conn->session->lock); | |
210 | __iscsi_get_ctask(ctask); | |
211 | spin_unlock_bh(&ctask->conn->session->lock); | |
212 | } | |
213 | ||
214 | static void __iscsi_put_ctask(struct iscsi_cmd_task *ctask) | |
215 | { | |
e648f63c | 216 | if (atomic_dec_and_test(&ctask->refcount)) |
60ecebf5 | 217 | iscsi_complete_command(ctask); |
60ecebf5 MC |
218 | } |
219 | ||
220 | static void iscsi_put_ctask(struct iscsi_cmd_task *ctask) | |
221 | { | |
222 | spin_lock_bh(&ctask->conn->session->lock); | |
223 | __iscsi_put_ctask(ctask); | |
224 | spin_unlock_bh(&ctask->conn->session->lock); | |
225 | } | |
226 | ||
7996a778 MC |
227 | /** |
228 | * iscsi_cmd_rsp - SCSI Command Response processing | |
229 | * @conn: iscsi connection | |
230 | * @hdr: iscsi header | |
231 | * @ctask: scsi command task | |
232 | * @data: cmd data buffer | |
233 | * @datalen: len of buffer | |
234 | * | |
235 | * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and | |
236 | * then completes the command and task. | |
237 | **/ | |
238 | static int iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
239 | struct iscsi_cmd_task *ctask, char *data, | |
240 | int datalen) | |
241 | { | |
242 | int rc; | |
243 | struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)hdr; | |
244 | struct iscsi_session *session = conn->session; | |
245 | struct scsi_cmnd *sc = ctask->sc; | |
246 | ||
247 | rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr); | |
248 | if (rc) { | |
249 | sc->result = DID_ERROR << 16; | |
250 | goto out; | |
251 | } | |
252 | ||
253 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; | |
254 | ||
255 | sc->result = (DID_OK << 16) | rhdr->cmd_status; | |
256 | ||
257 | if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) { | |
258 | sc->result = DID_ERROR << 16; | |
259 | goto out; | |
260 | } | |
261 | ||
262 | if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) { | |
9b80cb4b | 263 | uint16_t senselen; |
7996a778 MC |
264 | |
265 | if (datalen < 2) { | |
266 | invalid_datalen: | |
be2df72e OG |
267 | printk(KERN_ERR "iscsi: Got CHECK_CONDITION but " |
268 | "invalid data buffer size of %d\n", datalen); | |
7996a778 MC |
269 | sc->result = DID_BAD_TARGET << 16; |
270 | goto out; | |
271 | } | |
272 | ||
8eb00539 | 273 | senselen = be16_to_cpu(get_unaligned((__be16 *) data)); |
7996a778 MC |
274 | if (datalen < senselen) |
275 | goto invalid_datalen; | |
276 | ||
277 | memcpy(sc->sense_buffer, data + 2, | |
9b80cb4b | 278 | min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE)); |
7996a778 | 279 | debug_scsi("copied %d bytes of sense\n", |
8eb00539 | 280 | min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE)); |
7996a778 MC |
281 | } |
282 | ||
283 | if (sc->sc_data_direction == DMA_TO_DEVICE) | |
284 | goto out; | |
285 | ||
286 | if (rhdr->flags & ISCSI_FLAG_CMD_UNDERFLOW) { | |
287 | int res_count = be32_to_cpu(rhdr->residual_count); | |
288 | ||
289 | if (res_count > 0 && res_count <= sc->request_bufflen) | |
290 | sc->resid = res_count; | |
291 | else | |
292 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
293 | } else if (rhdr->flags & ISCSI_FLAG_CMD_BIDI_UNDERFLOW) | |
294 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
295 | else if (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW) | |
296 | sc->resid = be32_to_cpu(rhdr->residual_count); | |
297 | ||
298 | out: | |
299 | debug_scsi("done [sc %lx res %d itt 0x%x]\n", | |
300 | (long)sc, sc->result, ctask->itt); | |
301 | conn->scsirsp_pdus_cnt++; | |
302 | ||
60ecebf5 | 303 | __iscsi_put_ctask(ctask); |
7996a778 MC |
304 | return rc; |
305 | } | |
306 | ||
7ea8b828 MC |
307 | static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr) |
308 | { | |
309 | struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr; | |
310 | ||
311 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
312 | conn->tmfrsp_pdus_cnt++; | |
313 | ||
314 | if (conn->tmabort_state != TMABORT_INITIAL) | |
315 | return; | |
316 | ||
317 | if (tmf->response == ISCSI_TMF_RSP_COMPLETE) | |
318 | conn->tmabort_state = TMABORT_SUCCESS; | |
319 | else if (tmf->response == ISCSI_TMF_RSP_NO_TASK) | |
320 | conn->tmabort_state = TMABORT_NOT_FOUND; | |
321 | else | |
322 | conn->tmabort_state = TMABORT_FAILED; | |
323 | wake_up(&conn->ehwait); | |
324 | } | |
325 | ||
62f38300 MC |
326 | static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
327 | char *data, int datalen) | |
328 | { | |
329 | struct iscsi_reject *reject = (struct iscsi_reject *)hdr; | |
330 | struct iscsi_hdr rejected_pdu; | |
331 | uint32_t itt; | |
332 | ||
333 | conn->exp_statsn = be32_to_cpu(reject->statsn) + 1; | |
334 | ||
335 | if (reject->reason == ISCSI_REASON_DATA_DIGEST_ERROR) { | |
336 | if (ntoh24(reject->dlength) > datalen) | |
337 | return ISCSI_ERR_PROTO; | |
338 | ||
339 | if (ntoh24(reject->dlength) >= sizeof(struct iscsi_hdr)) { | |
340 | memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr)); | |
b4377356 | 341 | itt = get_itt(rejected_pdu.itt); |
62f38300 MC |
342 | printk(KERN_ERR "itt 0x%x had pdu (op 0x%x) rejected " |
343 | "due to DataDigest error.\n", itt, | |
344 | rejected_pdu.opcode); | |
345 | } | |
346 | } | |
347 | return 0; | |
348 | } | |
349 | ||
7996a778 MC |
350 | /** |
351 | * __iscsi_complete_pdu - complete pdu | |
352 | * @conn: iscsi conn | |
353 | * @hdr: iscsi header | |
354 | * @data: data buffer | |
355 | * @datalen: len of data buffer | |
356 | * | |
357 | * Completes pdu processing by freeing any resources allocated at | |
358 | * queuecommand or send generic. session lock must be held and verify | |
359 | * itt must have been called. | |
360 | */ | |
361 | int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
362 | char *data, int datalen) | |
363 | { | |
364 | struct iscsi_session *session = conn->session; | |
365 | int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0; | |
366 | struct iscsi_cmd_task *ctask; | |
367 | struct iscsi_mgmt_task *mtask; | |
368 | uint32_t itt; | |
369 | ||
b4377356 AV |
370 | if (hdr->itt != RESERVED_ITT) |
371 | itt = get_itt(hdr->itt); | |
7996a778 | 372 | else |
b4377356 | 373 | itt = ~0U; |
7996a778 MC |
374 | |
375 | if (itt < session->cmds_max) { | |
376 | ctask = session->cmds[itt]; | |
377 | ||
378 | debug_scsi("cmdrsp [op 0x%x cid %d itt 0x%x len %d]\n", | |
379 | opcode, conn->id, ctask->itt, datalen); | |
380 | ||
381 | switch(opcode) { | |
382 | case ISCSI_OP_SCSI_CMD_RSP: | |
383 | BUG_ON((void*)ctask != ctask->sc->SCp.ptr); | |
384 | rc = iscsi_scsi_cmd_rsp(conn, hdr, ctask, data, | |
385 | datalen); | |
386 | break; | |
387 | case ISCSI_OP_SCSI_DATA_IN: | |
388 | BUG_ON((void*)ctask != ctask->sc->SCp.ptr); | |
389 | if (hdr->flags & ISCSI_FLAG_DATA_STATUS) { | |
390 | conn->scsirsp_pdus_cnt++; | |
60ecebf5 | 391 | __iscsi_put_ctask(ctask); |
7996a778 MC |
392 | } |
393 | break; | |
394 | case ISCSI_OP_R2T: | |
395 | /* LLD handles this for now */ | |
396 | break; | |
397 | default: | |
398 | rc = ISCSI_ERR_BAD_OPCODE; | |
399 | break; | |
400 | } | |
401 | } else if (itt >= ISCSI_MGMT_ITT_OFFSET && | |
402 | itt < ISCSI_MGMT_ITT_OFFSET + session->mgmtpool_max) { | |
403 | mtask = session->mgmt_cmds[itt - ISCSI_MGMT_ITT_OFFSET]; | |
404 | ||
405 | debug_scsi("immrsp [op 0x%x cid %d itt 0x%x len %d]\n", | |
406 | opcode, conn->id, mtask->itt, datalen); | |
407 | ||
8d2860b3 MC |
408 | rc = iscsi_check_assign_cmdsn(session, |
409 | (struct iscsi_nopin*)hdr); | |
410 | if (rc) | |
411 | goto done; | |
412 | ||
7996a778 | 413 | switch(opcode) { |
8d2860b3 | 414 | case ISCSI_OP_LOGOUT_RSP: |
c8dc1e52 MC |
415 | if (datalen) { |
416 | rc = ISCSI_ERR_PROTO; | |
417 | break; | |
418 | } | |
8d2860b3 MC |
419 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; |
420 | /* fall through */ | |
7996a778 MC |
421 | case ISCSI_OP_LOGIN_RSP: |
422 | case ISCSI_OP_TEXT_RSP: | |
8d2860b3 MC |
423 | /* |
424 | * login related PDU's exp_statsn is handled in | |
425 | * userspace | |
426 | */ | |
40527afe MC |
427 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) |
428 | rc = ISCSI_ERR_CONN_FAILED; | |
7996a778 MC |
429 | list_del(&mtask->running); |
430 | if (conn->login_mtask != mtask) | |
431 | __kfifo_put(session->mgmtpool.queue, | |
432 | (void*)&mtask, sizeof(void*)); | |
433 | break; | |
434 | case ISCSI_OP_SCSI_TMFUNC_RSP: | |
7996a778 MC |
435 | if (datalen) { |
436 | rc = ISCSI_ERR_PROTO; | |
437 | break; | |
438 | } | |
8d2860b3 | 439 | |
7ea8b828 | 440 | iscsi_tmf_rsp(conn, hdr); |
7996a778 MC |
441 | break; |
442 | case ISCSI_OP_NOOP_IN: | |
b4377356 | 443 | if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) { |
7996a778 MC |
444 | rc = ISCSI_ERR_PROTO; |
445 | break; | |
446 | } | |
7996a778 MC |
447 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; |
448 | ||
40527afe MC |
449 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) |
450 | rc = ISCSI_ERR_CONN_FAILED; | |
7996a778 MC |
451 | list_del(&mtask->running); |
452 | if (conn->login_mtask != mtask) | |
453 | __kfifo_put(session->mgmtpool.queue, | |
454 | (void*)&mtask, sizeof(void*)); | |
455 | break; | |
456 | default: | |
457 | rc = ISCSI_ERR_BAD_OPCODE; | |
458 | break; | |
459 | } | |
b4377356 | 460 | } else if (itt == ~0U) { |
62f38300 MC |
461 | rc = iscsi_check_assign_cmdsn(session, |
462 | (struct iscsi_nopin*)hdr); | |
463 | if (rc) | |
464 | goto done; | |
465 | ||
7996a778 MC |
466 | switch(opcode) { |
467 | case ISCSI_OP_NOOP_IN: | |
40527afe | 468 | if (datalen) { |
7996a778 | 469 | rc = ISCSI_ERR_PROTO; |
40527afe MC |
470 | break; |
471 | } | |
472 | ||
b4377356 | 473 | if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG)) |
40527afe MC |
474 | break; |
475 | ||
476 | if (iscsi_recv_pdu(conn->cls_conn, hdr, NULL, 0)) | |
477 | rc = ISCSI_ERR_CONN_FAILED; | |
7996a778 MC |
478 | break; |
479 | case ISCSI_OP_REJECT: | |
62f38300 MC |
480 | rc = iscsi_handle_reject(conn, hdr, data, datalen); |
481 | break; | |
7996a778 | 482 | case ISCSI_OP_ASYNC_EVENT: |
8d2860b3 | 483 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; |
5831c737 MC |
484 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) |
485 | rc = ISCSI_ERR_CONN_FAILED; | |
7996a778 MC |
486 | break; |
487 | default: | |
488 | rc = ISCSI_ERR_BAD_OPCODE; | |
489 | break; | |
490 | } | |
491 | } else | |
492 | rc = ISCSI_ERR_BAD_ITT; | |
493 | ||
8d2860b3 | 494 | done: |
7996a778 MC |
495 | return rc; |
496 | } | |
497 | EXPORT_SYMBOL_GPL(__iscsi_complete_pdu); | |
498 | ||
499 | int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
500 | char *data, int datalen) | |
501 | { | |
502 | int rc; | |
503 | ||
504 | spin_lock(&conn->session->lock); | |
505 | rc = __iscsi_complete_pdu(conn, hdr, data, datalen); | |
506 | spin_unlock(&conn->session->lock); | |
507 | return rc; | |
508 | } | |
509 | EXPORT_SYMBOL_GPL(iscsi_complete_pdu); | |
510 | ||
511 | /* verify itt (itt encoding: age+cid+itt) */ | |
512 | int iscsi_verify_itt(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
513 | uint32_t *ret_itt) | |
514 | { | |
515 | struct iscsi_session *session = conn->session; | |
516 | struct iscsi_cmd_task *ctask; | |
517 | uint32_t itt; | |
518 | ||
b4377356 AV |
519 | if (hdr->itt != RESERVED_ITT) { |
520 | if (((__force u32)hdr->itt & ISCSI_AGE_MASK) != | |
7996a778 | 521 | (session->age << ISCSI_AGE_SHIFT)) { |
be2df72e | 522 | printk(KERN_ERR "iscsi: received itt %x expected " |
b4377356 | 523 | "session age (%x)\n", (__force u32)hdr->itt, |
7996a778 MC |
524 | session->age & ISCSI_AGE_MASK); |
525 | return ISCSI_ERR_BAD_ITT; | |
526 | } | |
527 | ||
b4377356 | 528 | if (((__force u32)hdr->itt & ISCSI_CID_MASK) != |
7996a778 | 529 | (conn->id << ISCSI_CID_SHIFT)) { |
be2df72e | 530 | printk(KERN_ERR "iscsi: received itt %x, expected " |
b4377356 | 531 | "CID (%x)\n", (__force u32)hdr->itt, conn->id); |
7996a778 MC |
532 | return ISCSI_ERR_BAD_ITT; |
533 | } | |
b4377356 | 534 | itt = get_itt(hdr->itt); |
7996a778 | 535 | } else |
b4377356 | 536 | itt = ~0U; |
7996a778 MC |
537 | |
538 | if (itt < session->cmds_max) { | |
539 | ctask = session->cmds[itt]; | |
540 | ||
541 | if (!ctask->sc) { | |
be2df72e | 542 | printk(KERN_INFO "iscsi: dropping ctask with " |
7996a778 MC |
543 | "itt 0x%x\n", ctask->itt); |
544 | /* force drop */ | |
545 | return ISCSI_ERR_NO_SCSI_CMD; | |
546 | } | |
547 | ||
548 | if (ctask->sc->SCp.phase != session->age) { | |
be2df72e | 549 | printk(KERN_ERR "iscsi: ctask's session age %d, " |
7996a778 MC |
550 | "expected %d\n", ctask->sc->SCp.phase, |
551 | session->age); | |
552 | return ISCSI_ERR_SESSION_FAILED; | |
553 | } | |
554 | } | |
555 | ||
556 | *ret_itt = itt; | |
557 | return 0; | |
558 | } | |
559 | EXPORT_SYMBOL_GPL(iscsi_verify_itt); | |
560 | ||
561 | void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err) | |
562 | { | |
563 | struct iscsi_session *session = conn->session; | |
564 | unsigned long flags; | |
565 | ||
566 | spin_lock_irqsave(&session->lock, flags); | |
656cffc9 MC |
567 | if (session->state == ISCSI_STATE_FAILED) { |
568 | spin_unlock_irqrestore(&session->lock, flags); | |
569 | return; | |
570 | } | |
571 | ||
67a61114 | 572 | if (conn->stop_stage == 0) |
7996a778 MC |
573 | session->state = ISCSI_STATE_FAILED; |
574 | spin_unlock_irqrestore(&session->lock, flags); | |
575 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
576 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
577 | iscsi_conn_error(conn->cls_conn, err); | |
578 | } | |
579 | EXPORT_SYMBOL_GPL(iscsi_conn_failure); | |
580 | ||
05db888a | 581 | static int iscsi_xmit_mtask(struct iscsi_conn *conn) |
b5072ea0 MC |
582 | { |
583 | struct iscsi_hdr *hdr = conn->mtask->hdr; | |
584 | int rc, was_logout = 0; | |
585 | ||
586 | if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT) { | |
587 | conn->session->state = ISCSI_STATE_IN_RECOVERY; | |
588 | iscsi_block_session(session_to_cls(conn->session)); | |
589 | was_logout = 1; | |
590 | } | |
591 | rc = conn->session->tt->xmit_mgmt_task(conn, conn->mtask); | |
592 | if (rc) | |
593 | return rc; | |
594 | ||
05db888a MC |
595 | /* done with this in-progress mtask */ |
596 | conn->mtask = NULL; | |
597 | ||
b5072ea0 MC |
598 | if (was_logout) { |
599 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
600 | return -ENODATA; | |
601 | } | |
602 | return 0; | |
603 | } | |
604 | ||
7996a778 MC |
605 | /** |
606 | * iscsi_data_xmit - xmit any command into the scheduled connection | |
607 | * @conn: iscsi connection | |
608 | * | |
609 | * Notes: | |
610 | * The function can return -EAGAIN in which case the caller must | |
611 | * re-schedule it again later or recover. '0' return code means | |
612 | * successful xmit. | |
613 | **/ | |
614 | static int iscsi_data_xmit(struct iscsi_conn *conn) | |
615 | { | |
616 | struct iscsi_transport *tt; | |
3219e529 | 617 | int rc = 0; |
7996a778 MC |
618 | |
619 | if (unlikely(conn->suspend_tx)) { | |
620 | debug_scsi("conn %d Tx suspended!\n", conn->id); | |
3219e529 | 621 | return -ENODATA; |
7996a778 MC |
622 | } |
623 | tt = conn->session->tt; | |
624 | ||
625 | /* | |
626 | * Transmit in the following order: | |
627 | * | |
628 | * 1) un-finished xmit (ctask or mtask) | |
629 | * 2) immediate control PDUs | |
630 | * 3) write data | |
631 | * 4) SCSI commands | |
632 | * 5) non-immediate control PDUs | |
633 | * | |
634 | * No need to lock around __kfifo_get as long as | |
635 | * there's one producer and one consumer. | |
636 | */ | |
637 | ||
638 | BUG_ON(conn->ctask && conn->mtask); | |
639 | ||
640 | if (conn->ctask) { | |
60ecebf5 | 641 | iscsi_get_ctask(conn->ctask); |
3219e529 | 642 | rc = tt->xmit_cmd_task(conn, conn->ctask); |
60ecebf5 | 643 | iscsi_put_ctask(conn->ctask); |
3219e529 | 644 | if (rc) |
7996a778 MC |
645 | goto again; |
646 | /* done with this in-progress ctask */ | |
647 | conn->ctask = NULL; | |
648 | } | |
649 | if (conn->mtask) { | |
05db888a | 650 | rc = iscsi_xmit_mtask(conn); |
3219e529 | 651 | if (rc) |
7996a778 | 652 | goto again; |
7996a778 MC |
653 | } |
654 | ||
655 | /* process immediate first */ | |
656 | if (unlikely(__kfifo_len(conn->immqueue))) { | |
657 | while (__kfifo_get(conn->immqueue, (void*)&conn->mtask, | |
658 | sizeof(void*))) { | |
994442e8 | 659 | spin_lock_bh(&conn->session->lock); |
7996a778 MC |
660 | list_add_tail(&conn->mtask->running, |
661 | &conn->mgmt_run_list); | |
994442e8 | 662 | spin_unlock_bh(&conn->session->lock); |
05db888a | 663 | rc = iscsi_xmit_mtask(conn); |
3219e529 | 664 | if (rc) |
7996a778 MC |
665 | goto again; |
666 | } | |
7996a778 MC |
667 | } |
668 | ||
669 | /* process command queue */ | |
b6c395ed MC |
670 | spin_lock_bh(&conn->session->lock); |
671 | while (!list_empty(&conn->xmitqueue)) { | |
7996a778 MC |
672 | /* |
673 | * iscsi tcp may readd the task to the xmitqueue to send | |
674 | * write data | |
675 | */ | |
b6c395ed MC |
676 | conn->ctask = list_entry(conn->xmitqueue.next, |
677 | struct iscsi_cmd_task, running); | |
678 | conn->ctask->state = ISCSI_TASK_RUNNING; | |
679 | list_move_tail(conn->xmitqueue.next, &conn->run_list); | |
60ecebf5 | 680 | __iscsi_get_ctask(conn->ctask); |
994442e8 | 681 | spin_unlock_bh(&conn->session->lock); |
b6c395ed | 682 | |
3219e529 | 683 | rc = tt->xmit_cmd_task(conn, conn->ctask); |
60ecebf5 | 684 | |
b6c395ed | 685 | spin_lock_bh(&conn->session->lock); |
60ecebf5 MC |
686 | __iscsi_put_ctask(conn->ctask); |
687 | if (rc) { | |
688 | spin_unlock_bh(&conn->session->lock); | |
689 | goto again; | |
690 | } | |
7996a778 | 691 | } |
b6c395ed | 692 | spin_unlock_bh(&conn->session->lock); |
7996a778 MC |
693 | /* done with this ctask */ |
694 | conn->ctask = NULL; | |
695 | ||
696 | /* process the rest control plane PDUs, if any */ | |
697 | if (unlikely(__kfifo_len(conn->mgmtqueue))) { | |
698 | while (__kfifo_get(conn->mgmtqueue, (void*)&conn->mtask, | |
699 | sizeof(void*))) { | |
994442e8 | 700 | spin_lock_bh(&conn->session->lock); |
7996a778 MC |
701 | list_add_tail(&conn->mtask->running, |
702 | &conn->mgmt_run_list); | |
994442e8 | 703 | spin_unlock_bh(&conn->session->lock); |
05db888a MC |
704 | rc = iscsi_xmit_mtask(conn); |
705 | if (rc) | |
7996a778 MC |
706 | goto again; |
707 | } | |
7996a778 MC |
708 | } |
709 | ||
3219e529 | 710 | return -ENODATA; |
7996a778 MC |
711 | |
712 | again: | |
713 | if (unlikely(conn->suspend_tx)) | |
3219e529 | 714 | return -ENODATA; |
7996a778 | 715 | |
3219e529 | 716 | return rc; |
7996a778 MC |
717 | } |
718 | ||
c4028958 | 719 | static void iscsi_xmitworker(struct work_struct *work) |
7996a778 | 720 | { |
c4028958 DH |
721 | struct iscsi_conn *conn = |
722 | container_of(work, struct iscsi_conn, xmitwork); | |
3219e529 | 723 | int rc; |
7996a778 MC |
724 | /* |
725 | * serialize Xmit worker on a per-connection basis. | |
726 | */ | |
727 | mutex_lock(&conn->xmitmutex); | |
3219e529 MC |
728 | do { |
729 | rc = iscsi_data_xmit(conn); | |
730 | } while (rc >= 0 || rc == -EAGAIN); | |
7996a778 MC |
731 | mutex_unlock(&conn->xmitmutex); |
732 | } | |
733 | ||
734 | enum { | |
735 | FAILURE_BAD_HOST = 1, | |
736 | FAILURE_SESSION_FAILED, | |
737 | FAILURE_SESSION_FREED, | |
738 | FAILURE_WINDOW_CLOSED, | |
60ecebf5 | 739 | FAILURE_OOM, |
7996a778 | 740 | FAILURE_SESSION_TERMINATE, |
656cffc9 | 741 | FAILURE_SESSION_IN_RECOVERY, |
7996a778 MC |
742 | FAILURE_SESSION_RECOVERY_TIMEOUT, |
743 | }; | |
744 | ||
745 | int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *)) | |
746 | { | |
747 | struct Scsi_Host *host; | |
748 | int reason = 0; | |
749 | struct iscsi_session *session; | |
750 | struct iscsi_conn *conn; | |
751 | struct iscsi_cmd_task *ctask = NULL; | |
752 | ||
753 | sc->scsi_done = done; | |
754 | sc->result = 0; | |
f47f2cf5 | 755 | sc->SCp.ptr = NULL; |
7996a778 MC |
756 | |
757 | host = sc->device->host; | |
758 | session = iscsi_hostdata(host->hostdata); | |
759 | ||
760 | spin_lock(&session->lock); | |
761 | ||
656cffc9 MC |
762 | /* |
763 | * ISCSI_STATE_FAILED is a temp. state. The recovery | |
764 | * code will decide what is best to do with command queued | |
765 | * during this time | |
766 | */ | |
767 | if (session->state != ISCSI_STATE_LOGGED_IN && | |
768 | session->state != ISCSI_STATE_FAILED) { | |
769 | /* | |
770 | * to handle the race between when we set the recovery state | |
771 | * and block the session we requeue here (commands could | |
772 | * be entering our queuecommand while a block is starting | |
773 | * up because the block code is not locked) | |
774 | */ | |
775 | if (session->state == ISCSI_STATE_IN_RECOVERY) { | |
776 | reason = FAILURE_SESSION_IN_RECOVERY; | |
67a61114 | 777 | goto reject; |
7996a778 | 778 | } |
656cffc9 MC |
779 | |
780 | if (session->state == ISCSI_STATE_RECOVERY_FAILED) | |
781 | reason = FAILURE_SESSION_RECOVERY_TIMEOUT; | |
782 | else if (session->state == ISCSI_STATE_TERMINATE) | |
783 | reason = FAILURE_SESSION_TERMINATE; | |
784 | else | |
785 | reason = FAILURE_SESSION_FREED; | |
7996a778 MC |
786 | goto fault; |
787 | } | |
788 | ||
789 | /* | |
790 | * Check for iSCSI window and take care of CmdSN wrap-around | |
791 | */ | |
792 | if ((int)(session->max_cmdsn - session->cmdsn) < 0) { | |
793 | reason = FAILURE_WINDOW_CLOSED; | |
794 | goto reject; | |
795 | } | |
796 | ||
797 | conn = session->leadconn; | |
98644047 MC |
798 | if (!conn) { |
799 | reason = FAILURE_SESSION_FREED; | |
800 | goto fault; | |
801 | } | |
7996a778 | 802 | |
60ecebf5 MC |
803 | if (!__kfifo_get(session->cmdpool.queue, (void*)&ctask, |
804 | sizeof(void*))) { | |
805 | reason = FAILURE_OOM; | |
806 | goto reject; | |
807 | } | |
7996a778 MC |
808 | sc->SCp.phase = session->age; |
809 | sc->SCp.ptr = (char *)ctask; | |
810 | ||
60ecebf5 | 811 | atomic_set(&ctask->refcount, 1); |
b6c395ed | 812 | ctask->state = ISCSI_TASK_PENDING; |
7996a778 MC |
813 | ctask->mtask = NULL; |
814 | ctask->conn = conn; | |
815 | ctask->sc = sc; | |
816 | INIT_LIST_HEAD(&ctask->running); | |
817 | ctask->total_length = sc->request_bufflen; | |
818 | iscsi_prep_scsi_cmd_pdu(ctask); | |
819 | ||
820 | session->tt->init_cmd_task(ctask); | |
821 | ||
b6c395ed | 822 | list_add_tail(&ctask->running, &conn->xmitqueue); |
7996a778 | 823 | debug_scsi( |
f47f2cf5 MC |
824 | "ctask enq [%s cid %d sc %p cdb 0x%x itt 0x%x len %d cmdsn %d " |
825 | "win %d]\n", | |
7996a778 | 826 | sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read", |
f47f2cf5 | 827 | conn->id, sc, sc->cmnd[0], ctask->itt, sc->request_bufflen, |
7996a778 MC |
828 | session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1); |
829 | spin_unlock(&session->lock); | |
830 | ||
831 | scsi_queue_work(host, &conn->xmitwork); | |
832 | return 0; | |
833 | ||
834 | reject: | |
835 | spin_unlock(&session->lock); | |
836 | debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason); | |
837 | return SCSI_MLQUEUE_HOST_BUSY; | |
838 | ||
839 | fault: | |
840 | spin_unlock(&session->lock); | |
be2df72e | 841 | printk(KERN_ERR "iscsi: cmd 0x%x is not queued (%d)\n", |
7996a778 MC |
842 | sc->cmnd[0], reason); |
843 | sc->result = (DID_NO_CONNECT << 16); | |
844 | sc->resid = sc->request_bufflen; | |
845 | sc->scsi_done(sc); | |
846 | return 0; | |
847 | } | |
848 | EXPORT_SYMBOL_GPL(iscsi_queuecommand); | |
849 | ||
850 | int iscsi_change_queue_depth(struct scsi_device *sdev, int depth) | |
851 | { | |
852 | if (depth > ISCSI_MAX_CMD_PER_LUN) | |
853 | depth = ISCSI_MAX_CMD_PER_LUN; | |
854 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); | |
855 | return sdev->queue_depth; | |
856 | } | |
857 | EXPORT_SYMBOL_GPL(iscsi_change_queue_depth); | |
858 | ||
859 | static int | |
860 | iscsi_conn_send_generic(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
861 | char *data, uint32_t data_size) | |
862 | { | |
863 | struct iscsi_session *session = conn->session; | |
864 | struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr; | |
865 | struct iscsi_mgmt_task *mtask; | |
866 | ||
867 | spin_lock_bh(&session->lock); | |
868 | if (session->state == ISCSI_STATE_TERMINATE) { | |
869 | spin_unlock_bh(&session->lock); | |
870 | return -EPERM; | |
871 | } | |
872 | if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) || | |
873 | hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE)) | |
874 | /* | |
875 | * Login and Text are sent serially, in | |
876 | * request-followed-by-response sequence. | |
877 | * Same mtask can be used. Same ITT must be used. | |
878 | * Note that login_mtask is preallocated at conn_create(). | |
879 | */ | |
880 | mtask = conn->login_mtask; | |
881 | else { | |
656cffc9 MC |
882 | BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE); |
883 | BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED); | |
7996a778 | 884 | |
8d2860b3 | 885 | nop->exp_statsn = cpu_to_be32(conn->exp_statsn); |
7996a778 MC |
886 | if (!__kfifo_get(session->mgmtpool.queue, |
887 | (void*)&mtask, sizeof(void*))) { | |
888 | spin_unlock_bh(&session->lock); | |
889 | return -ENOSPC; | |
890 | } | |
891 | } | |
892 | ||
893 | /* | |
8d2860b3 | 894 | * pre-format CmdSN for outgoing PDU. |
7996a778 | 895 | */ |
b4377356 AV |
896 | if (hdr->itt != RESERVED_ITT) { |
897 | hdr->itt = build_itt(mtask->itt, conn->id, session->age); | |
7996a778 MC |
898 | nop->cmdsn = cpu_to_be32(session->cmdsn); |
899 | if (conn->c_stage == ISCSI_CONN_STARTED && | |
900 | !(hdr->opcode & ISCSI_OP_IMMEDIATE)) | |
901 | session->cmdsn++; | |
902 | } else | |
903 | /* do not advance CmdSN */ | |
904 | nop->cmdsn = cpu_to_be32(session->cmdsn); | |
905 | ||
7996a778 MC |
906 | if (data_size) { |
907 | memcpy(mtask->data, data, data_size); | |
908 | mtask->data_count = data_size; | |
909 | } else | |
910 | mtask->data_count = 0; | |
911 | ||
912 | INIT_LIST_HEAD(&mtask->running); | |
913 | memcpy(mtask->hdr, hdr, sizeof(struct iscsi_hdr)); | |
914 | if (session->tt->init_mgmt_task) | |
915 | session->tt->init_mgmt_task(conn, mtask, data, data_size); | |
916 | spin_unlock_bh(&session->lock); | |
917 | ||
918 | debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n", | |
919 | hdr->opcode, hdr->itt, data_size); | |
920 | ||
921 | /* | |
922 | * since send_pdu() could be called at least from two contexts, | |
923 | * we need to serialize __kfifo_put, so we don't have to take | |
924 | * additional lock on fast data-path | |
925 | */ | |
926 | if (hdr->opcode & ISCSI_OP_IMMEDIATE) | |
927 | __kfifo_put(conn->immqueue, (void*)&mtask, sizeof(void*)); | |
928 | else | |
929 | __kfifo_put(conn->mgmtqueue, (void*)&mtask, sizeof(void*)); | |
930 | ||
931 | scsi_queue_work(session->host, &conn->xmitwork); | |
932 | return 0; | |
933 | } | |
934 | ||
935 | int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr, | |
936 | char *data, uint32_t data_size) | |
937 | { | |
938 | struct iscsi_conn *conn = cls_conn->dd_data; | |
939 | int rc; | |
940 | ||
941 | mutex_lock(&conn->xmitmutex); | |
942 | rc = iscsi_conn_send_generic(conn, hdr, data, data_size); | |
943 | mutex_unlock(&conn->xmitmutex); | |
944 | ||
945 | return rc; | |
946 | } | |
947 | EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu); | |
948 | ||
949 | void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session) | |
950 | { | |
951 | struct iscsi_session *session = class_to_transport_session(cls_session); | |
952 | struct iscsi_conn *conn = session->leadconn; | |
953 | ||
954 | spin_lock_bh(&session->lock); | |
955 | if (session->state != ISCSI_STATE_LOGGED_IN) { | |
656cffc9 | 956 | session->state = ISCSI_STATE_RECOVERY_FAILED; |
7996a778 MC |
957 | if (conn) |
958 | wake_up(&conn->ehwait); | |
959 | } | |
960 | spin_unlock_bh(&session->lock); | |
961 | } | |
962 | EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout); | |
963 | ||
964 | int iscsi_eh_host_reset(struct scsi_cmnd *sc) | |
965 | { | |
966 | struct Scsi_Host *host = sc->device->host; | |
967 | struct iscsi_session *session = iscsi_hostdata(host->hostdata); | |
968 | struct iscsi_conn *conn = session->leadconn; | |
969 | int fail_session = 0; | |
970 | ||
971 | spin_lock_bh(&session->lock); | |
972 | if (session->state == ISCSI_STATE_TERMINATE) { | |
973 | failed: | |
974 | debug_scsi("failing host reset: session terminated " | |
d6e24d1c | 975 | "[CID %d age %d]\n", conn->id, session->age); |
7996a778 MC |
976 | spin_unlock_bh(&session->lock); |
977 | return FAILED; | |
978 | } | |
979 | ||
980 | if (sc->SCp.phase == session->age) { | |
d6e24d1c | 981 | debug_scsi("failing connection CID %d due to SCSI host reset\n", |
7996a778 MC |
982 | conn->id); |
983 | fail_session = 1; | |
984 | } | |
985 | spin_unlock_bh(&session->lock); | |
986 | ||
987 | /* | |
988 | * we drop the lock here but the leadconn cannot be destoyed while | |
989 | * we are in the scsi eh | |
990 | */ | |
656cffc9 | 991 | if (fail_session) |
7996a778 | 992 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
7996a778 MC |
993 | |
994 | debug_scsi("iscsi_eh_host_reset wait for relogin\n"); | |
995 | wait_event_interruptible(conn->ehwait, | |
996 | session->state == ISCSI_STATE_TERMINATE || | |
997 | session->state == ISCSI_STATE_LOGGED_IN || | |
656cffc9 | 998 | session->state == ISCSI_STATE_RECOVERY_FAILED); |
7996a778 MC |
999 | if (signal_pending(current)) |
1000 | flush_signals(current); | |
1001 | ||
1002 | spin_lock_bh(&session->lock); | |
1003 | if (session->state == ISCSI_STATE_LOGGED_IN) | |
be2df72e | 1004 | printk(KERN_INFO "iscsi: host reset succeeded\n"); |
7996a778 MC |
1005 | else |
1006 | goto failed; | |
1007 | spin_unlock_bh(&session->lock); | |
1008 | ||
1009 | return SUCCESS; | |
1010 | } | |
1011 | EXPORT_SYMBOL_GPL(iscsi_eh_host_reset); | |
1012 | ||
1013 | static void iscsi_tmabort_timedout(unsigned long data) | |
1014 | { | |
1015 | struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)data; | |
1016 | struct iscsi_conn *conn = ctask->conn; | |
1017 | struct iscsi_session *session = conn->session; | |
1018 | ||
1019 | spin_lock(&session->lock); | |
1020 | if (conn->tmabort_state == TMABORT_INITIAL) { | |
1021 | conn->tmabort_state = TMABORT_TIMEDOUT; | |
1022 | debug_scsi("tmabort timedout [sc %p itt 0x%x]\n", | |
1023 | ctask->sc, ctask->itt); | |
1024 | /* unblock eh_abort() */ | |
1025 | wake_up(&conn->ehwait); | |
1026 | } | |
1027 | spin_unlock(&session->lock); | |
1028 | } | |
1029 | ||
1030 | /* must be called with the mutex lock */ | |
1031 | static int iscsi_exec_abort_task(struct scsi_cmnd *sc, | |
1032 | struct iscsi_cmd_task *ctask) | |
1033 | { | |
1034 | struct iscsi_conn *conn = ctask->conn; | |
1035 | struct iscsi_session *session = conn->session; | |
1036 | struct iscsi_tm *hdr = &conn->tmhdr; | |
1037 | int rc; | |
1038 | ||
1039 | /* | |
1040 | * ctask timed out but session is OK requests must be serialized. | |
1041 | */ | |
1042 | memset(hdr, 0, sizeof(struct iscsi_tm)); | |
1043 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
1044 | hdr->flags = ISCSI_TM_FUNC_ABORT_TASK; | |
1045 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
1046 | memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); | |
1047 | hdr->rtt = ctask->hdr->itt; | |
1048 | hdr->refcmdsn = ctask->hdr->cmdsn; | |
1049 | ||
1050 | rc = iscsi_conn_send_generic(conn, (struct iscsi_hdr *)hdr, | |
1051 | NULL, 0); | |
1052 | if (rc) { | |
1053 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
d6e24d1c PW |
1054 | debug_scsi("abort sent failure [itt 0x%x] %d\n", ctask->itt, |
1055 | rc); | |
7996a778 MC |
1056 | return rc; |
1057 | } | |
1058 | ||
1059 | debug_scsi("abort sent [itt 0x%x]\n", ctask->itt); | |
1060 | ||
1061 | spin_lock_bh(&session->lock); | |
1062 | ctask->mtask = (struct iscsi_mgmt_task *) | |
b4377356 | 1063 | session->mgmt_cmds[get_itt(hdr->itt) - |
7996a778 MC |
1064 | ISCSI_MGMT_ITT_OFFSET]; |
1065 | ||
1066 | if (conn->tmabort_state == TMABORT_INITIAL) { | |
1067 | conn->tmfcmd_pdus_cnt++; | |
1068 | conn->tmabort_timer.expires = 10*HZ + jiffies; | |
1069 | conn->tmabort_timer.function = iscsi_tmabort_timedout; | |
1070 | conn->tmabort_timer.data = (unsigned long)ctask; | |
1071 | add_timer(&conn->tmabort_timer); | |
d6e24d1c | 1072 | debug_scsi("abort set timeout [itt 0x%x]\n", ctask->itt); |
7996a778 MC |
1073 | } |
1074 | spin_unlock_bh(&session->lock); | |
1075 | mutex_unlock(&conn->xmitmutex); | |
1076 | ||
1077 | /* | |
1078 | * block eh thread until: | |
1079 | * | |
1080 | * 1) abort response | |
1081 | * 2) abort timeout | |
1082 | * 3) session is terminated or restarted or userspace has | |
1083 | * given up on recovery | |
1084 | */ | |
1085 | wait_event_interruptible(conn->ehwait, | |
1086 | sc->SCp.phase != session->age || | |
1087 | session->state != ISCSI_STATE_LOGGED_IN || | |
656cffc9 | 1088 | conn->tmabort_state != TMABORT_INITIAL); |
7996a778 MC |
1089 | if (signal_pending(current)) |
1090 | flush_signals(current); | |
1091 | del_timer_sync(&conn->tmabort_timer); | |
1092 | ||
1093 | mutex_lock(&conn->xmitmutex); | |
1094 | return 0; | |
1095 | } | |
1096 | ||
1097 | /* | |
1098 | * xmit mutex and session lock must be held | |
1099 | */ | |
b6c395ed MC |
1100 | static struct iscsi_mgmt_task * |
1101 | iscsi_remove_mgmt_task(struct kfifo *fifo, uint32_t itt) | |
1102 | { | |
1103 | int i, nr_tasks = __kfifo_len(fifo) / sizeof(void*); | |
1104 | struct iscsi_mgmt_task *task; | |
1105 | ||
1106 | debug_scsi("searching %d tasks\n", nr_tasks); | |
1107 | ||
1108 | for (i = 0; i < nr_tasks; i++) { | |
1109 | __kfifo_get(fifo, (void*)&task, sizeof(void*)); | |
1110 | debug_scsi("check task %u\n", task->itt); | |
1111 | ||
1112 | if (task->itt == itt) { | |
1113 | debug_scsi("matched task\n"); | |
1114 | return task; | |
1115 | } | |
7996a778 | 1116 | |
b6c395ed MC |
1117 | __kfifo_put(fifo, (void*)&task, sizeof(void*)); |
1118 | } | |
1119 | return NULL; | |
1120 | } | |
7996a778 MC |
1121 | |
1122 | static int iscsi_ctask_mtask_cleanup(struct iscsi_cmd_task *ctask) | |
1123 | { | |
1124 | struct iscsi_conn *conn = ctask->conn; | |
1125 | struct iscsi_session *session = conn->session; | |
1126 | ||
1127 | if (!ctask->mtask) | |
1128 | return -EINVAL; | |
1129 | ||
1130 | if (!iscsi_remove_mgmt_task(conn->immqueue, ctask->mtask->itt)) | |
1131 | list_del(&ctask->mtask->running); | |
1132 | __kfifo_put(session->mgmtpool.queue, (void*)&ctask->mtask, | |
1133 | sizeof(void*)); | |
1134 | ctask->mtask = NULL; | |
1135 | return 0; | |
1136 | } | |
1137 | ||
1138 | /* | |
1139 | * session lock and xmitmutex must be held | |
1140 | */ | |
1141 | static void fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, | |
1142 | int err) | |
1143 | { | |
1144 | struct scsi_cmnd *sc; | |
1145 | ||
7996a778 MC |
1146 | sc = ctask->sc; |
1147 | if (!sc) | |
1148 | return; | |
e648f63c MC |
1149 | |
1150 | conn->session->tt->cleanup_cmd_task(conn, ctask); | |
7ea8b828 MC |
1151 | iscsi_ctask_mtask_cleanup(ctask); |
1152 | ||
7996a778 MC |
1153 | sc->result = err; |
1154 | sc->resid = sc->request_bufflen; | |
e648f63c | 1155 | /* release ref from queuecommand */ |
60ecebf5 | 1156 | __iscsi_put_ctask(ctask); |
7996a778 MC |
1157 | } |
1158 | ||
1159 | int iscsi_eh_abort(struct scsi_cmnd *sc) | |
1160 | { | |
f47f2cf5 MC |
1161 | struct iscsi_cmd_task *ctask; |
1162 | struct iscsi_conn *conn; | |
1163 | struct iscsi_session *session; | |
7996a778 MC |
1164 | int rc; |
1165 | ||
f47f2cf5 MC |
1166 | /* |
1167 | * if session was ISCSI_STATE_IN_RECOVERY then we may not have | |
1168 | * got the command. | |
1169 | */ | |
1170 | if (!sc->SCp.ptr) { | |
1171 | debug_scsi("sc never reached iscsi layer or it completed.\n"); | |
1172 | return SUCCESS; | |
1173 | } | |
1174 | ||
1175 | ctask = (struct iscsi_cmd_task *)sc->SCp.ptr; | |
1176 | conn = ctask->conn; | |
1177 | session = conn->session; | |
1178 | ||
7996a778 MC |
1179 | conn->eh_abort_cnt++; |
1180 | debug_scsi("aborting [sc %p itt 0x%x]\n", sc, ctask->itt); | |
1181 | ||
1182 | mutex_lock(&conn->xmitmutex); | |
1183 | spin_lock_bh(&session->lock); | |
1184 | ||
1185 | /* | |
1186 | * If we are not logged in or we have started a new session | |
1187 | * then let the host reset code handle this | |
1188 | */ | |
1189 | if (session->state != ISCSI_STATE_LOGGED_IN || | |
1190 | sc->SCp.phase != session->age) | |
1191 | goto failed; | |
1192 | ||
1193 | /* ctask completed before time out */ | |
7ea8b828 MC |
1194 | if (!ctask->sc) { |
1195 | spin_unlock_bh(&session->lock); | |
1196 | debug_scsi("sc completed while abort in progress\n"); | |
1197 | goto success_rel_mutex; | |
1198 | } | |
7996a778 MC |
1199 | |
1200 | /* what should we do here ? */ | |
1201 | if (conn->ctask == ctask) { | |
be2df72e OG |
1202 | printk(KERN_INFO "iscsi: sc %p itt 0x%x partially sent. " |
1203 | "Failing abort\n", sc, ctask->itt); | |
7996a778 MC |
1204 | goto failed; |
1205 | } | |
1206 | ||
b6c395ed | 1207 | if (ctask->state == ISCSI_TASK_PENDING) |
7ea8b828 | 1208 | goto success_cleanup; |
7996a778 MC |
1209 | |
1210 | conn->tmabort_state = TMABORT_INITIAL; | |
1211 | ||
1212 | spin_unlock_bh(&session->lock); | |
1213 | rc = iscsi_exec_abort_task(sc, ctask); | |
1214 | spin_lock_bh(&session->lock); | |
1215 | ||
7996a778 MC |
1216 | if (rc || sc->SCp.phase != session->age || |
1217 | session->state != ISCSI_STATE_LOGGED_IN) | |
1218 | goto failed; | |
7ea8b828 | 1219 | iscsi_ctask_mtask_cleanup(ctask); |
7996a778 | 1220 | |
7ea8b828 MC |
1221 | switch (conn->tmabort_state) { |
1222 | case TMABORT_SUCCESS: | |
1223 | goto success_cleanup; | |
1224 | case TMABORT_NOT_FOUND: | |
1225 | if (!ctask->sc) { | |
1226 | /* ctask completed before tmf abort response */ | |
1227 | spin_unlock_bh(&session->lock); | |
1228 | debug_scsi("sc completed while abort in progress\n"); | |
1229 | goto success_rel_mutex; | |
1230 | } | |
1231 | /* fall through */ | |
1232 | default: | |
1233 | /* timedout or failed */ | |
7996a778 MC |
1234 | spin_unlock_bh(&session->lock); |
1235 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1236 | spin_lock_bh(&session->lock); | |
1237 | goto failed; | |
1238 | } | |
1239 | ||
7ea8b828 | 1240 | success_cleanup: |
7996a778 MC |
1241 | debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, ctask->itt); |
1242 | spin_unlock_bh(&session->lock); | |
1243 | ||
1244 | /* | |
1245 | * clean up task if aborted. we have the xmitmutex so grab | |
1246 | * the recv lock as a writer | |
1247 | */ | |
1248 | write_lock_bh(conn->recv_lock); | |
1249 | spin_lock(&session->lock); | |
1250 | fail_command(conn, ctask, DID_ABORT << 16); | |
1251 | spin_unlock(&session->lock); | |
1252 | write_unlock_bh(conn->recv_lock); | |
1253 | ||
7ea8b828 | 1254 | success_rel_mutex: |
7996a778 MC |
1255 | mutex_unlock(&conn->xmitmutex); |
1256 | return SUCCESS; | |
1257 | ||
1258 | failed: | |
1259 | spin_unlock_bh(&session->lock); | |
1260 | mutex_unlock(&conn->xmitmutex); | |
1261 | ||
1262 | debug_scsi("abort failed [sc %lx itt 0x%x]\n", (long)sc, ctask->itt); | |
1263 | return FAILED; | |
1264 | } | |
1265 | EXPORT_SYMBOL_GPL(iscsi_eh_abort); | |
1266 | ||
1267 | int | |
1268 | iscsi_pool_init(struct iscsi_queue *q, int max, void ***items, int item_size) | |
1269 | { | |
1270 | int i; | |
1271 | ||
1272 | *items = kmalloc(max * sizeof(void*), GFP_KERNEL); | |
1273 | if (*items == NULL) | |
1274 | return -ENOMEM; | |
1275 | ||
1276 | q->max = max; | |
1277 | q->pool = kmalloc(max * sizeof(void*), GFP_KERNEL); | |
1278 | if (q->pool == NULL) { | |
1279 | kfree(*items); | |
1280 | return -ENOMEM; | |
1281 | } | |
1282 | ||
1283 | q->queue = kfifo_init((void*)q->pool, max * sizeof(void*), | |
1284 | GFP_KERNEL, NULL); | |
1285 | if (q->queue == ERR_PTR(-ENOMEM)) { | |
1286 | kfree(q->pool); | |
1287 | kfree(*items); | |
1288 | return -ENOMEM; | |
1289 | } | |
1290 | ||
1291 | for (i = 0; i < max; i++) { | |
1292 | q->pool[i] = kmalloc(item_size, GFP_KERNEL); | |
1293 | if (q->pool[i] == NULL) { | |
1294 | int j; | |
1295 | ||
1296 | for (j = 0; j < i; j++) | |
1297 | kfree(q->pool[j]); | |
1298 | ||
1299 | kfifo_free(q->queue); | |
1300 | kfree(q->pool); | |
1301 | kfree(*items); | |
1302 | return -ENOMEM; | |
1303 | } | |
1304 | memset(q->pool[i], 0, item_size); | |
1305 | (*items)[i] = q->pool[i]; | |
1306 | __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*)); | |
1307 | } | |
1308 | return 0; | |
1309 | } | |
1310 | EXPORT_SYMBOL_GPL(iscsi_pool_init); | |
1311 | ||
1312 | void iscsi_pool_free(struct iscsi_queue *q, void **items) | |
1313 | { | |
1314 | int i; | |
1315 | ||
1316 | for (i = 0; i < q->max; i++) | |
1317 | kfree(items[i]); | |
1318 | kfree(q->pool); | |
1319 | kfree(items); | |
1320 | } | |
1321 | EXPORT_SYMBOL_GPL(iscsi_pool_free); | |
1322 | ||
1323 | /* | |
1324 | * iSCSI Session's hostdata organization: | |
1325 | * | |
1326 | * *------------------* <== hostdata_session(host->hostdata) | |
1327 | * | ptr to class sess| | |
1328 | * |------------------| <== iscsi_hostdata(host->hostdata) | |
1329 | * | iscsi_session | | |
1330 | * *------------------* | |
1331 | */ | |
1332 | ||
1333 | #define hostdata_privsize(_sz) (sizeof(unsigned long) + _sz + \ | |
1334 | _sz % sizeof(unsigned long)) | |
1335 | ||
1336 | #define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata)) | |
1337 | ||
1338 | /** | |
1339 | * iscsi_session_setup - create iscsi cls session and host and session | |
1340 | * @scsit: scsi transport template | |
1341 | * @iscsit: iscsi transport template | |
1342 | * @initial_cmdsn: initial CmdSN | |
1343 | * @hostno: host no allocated | |
1344 | * | |
1345 | * This can be used by software iscsi_transports that allocate | |
1346 | * a session per scsi host. | |
1347 | **/ | |
1348 | struct iscsi_cls_session * | |
1349 | iscsi_session_setup(struct iscsi_transport *iscsit, | |
1350 | struct scsi_transport_template *scsit, | |
1351 | int cmd_task_size, int mgmt_task_size, | |
1352 | uint32_t initial_cmdsn, uint32_t *hostno) | |
1353 | { | |
1354 | struct Scsi_Host *shost; | |
1355 | struct iscsi_session *session; | |
1356 | struct iscsi_cls_session *cls_session; | |
1357 | int cmd_i; | |
1358 | ||
1359 | shost = scsi_host_alloc(iscsit->host_template, | |
1360 | hostdata_privsize(sizeof(*session))); | |
1361 | if (!shost) | |
1362 | return NULL; | |
1363 | ||
1364 | shost->max_id = 1; | |
1365 | shost->max_channel = 0; | |
1366 | shost->max_lun = iscsit->max_lun; | |
1367 | shost->max_cmd_len = iscsit->max_cmd_len; | |
1368 | shost->transportt = scsit; | |
1369 | shost->transportt->create_work_queue = 1; | |
1370 | *hostno = shost->host_no; | |
1371 | ||
1372 | session = iscsi_hostdata(shost->hostdata); | |
1373 | memset(session, 0, sizeof(struct iscsi_session)); | |
1374 | session->host = shost; | |
1375 | session->state = ISCSI_STATE_FREE; | |
1376 | session->mgmtpool_max = ISCSI_MGMT_CMDS_MAX; | |
1377 | session->cmds_max = ISCSI_XMIT_CMDS_MAX; | |
1378 | session->cmdsn = initial_cmdsn; | |
1379 | session->exp_cmdsn = initial_cmdsn + 1; | |
1380 | session->max_cmdsn = initial_cmdsn + 1; | |
1381 | session->max_r2t = 1; | |
1382 | session->tt = iscsit; | |
1383 | ||
1384 | /* initialize SCSI PDU commands pool */ | |
1385 | if (iscsi_pool_init(&session->cmdpool, session->cmds_max, | |
1386 | (void***)&session->cmds, | |
1387 | cmd_task_size + sizeof(struct iscsi_cmd_task))) | |
1388 | goto cmdpool_alloc_fail; | |
1389 | ||
1390 | /* pre-format cmds pool with ITT */ | |
1391 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
1392 | struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; | |
1393 | ||
1394 | if (cmd_task_size) | |
1395 | ctask->dd_data = &ctask[1]; | |
1396 | ctask->itt = cmd_i; | |
b6c395ed | 1397 | INIT_LIST_HEAD(&ctask->running); |
7996a778 MC |
1398 | } |
1399 | ||
1400 | spin_lock_init(&session->lock); | |
7996a778 MC |
1401 | |
1402 | /* initialize immediate command pool */ | |
1403 | if (iscsi_pool_init(&session->mgmtpool, session->mgmtpool_max, | |
1404 | (void***)&session->mgmt_cmds, | |
1405 | mgmt_task_size + sizeof(struct iscsi_mgmt_task))) | |
1406 | goto mgmtpool_alloc_fail; | |
1407 | ||
1408 | ||
1409 | /* pre-format immediate cmds pool with ITT */ | |
1410 | for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) { | |
1411 | struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i]; | |
1412 | ||
1413 | if (mgmt_task_size) | |
1414 | mtask->dd_data = &mtask[1]; | |
1415 | mtask->itt = ISCSI_MGMT_ITT_OFFSET + cmd_i; | |
b6c395ed | 1416 | INIT_LIST_HEAD(&mtask->running); |
7996a778 MC |
1417 | } |
1418 | ||
1419 | if (scsi_add_host(shost, NULL)) | |
1420 | goto add_host_fail; | |
1421 | ||
f53a88da MC |
1422 | if (!try_module_get(iscsit->owner)) |
1423 | goto cls_session_fail; | |
1424 | ||
6a8a0d36 | 1425 | cls_session = iscsi_create_session(shost, iscsit, 0); |
7996a778 | 1426 | if (!cls_session) |
f53a88da | 1427 | goto module_put; |
7996a778 MC |
1428 | *(unsigned long*)shost->hostdata = (unsigned long)cls_session; |
1429 | ||
1430 | return cls_session; | |
1431 | ||
f53a88da MC |
1432 | module_put: |
1433 | module_put(iscsit->owner); | |
7996a778 MC |
1434 | cls_session_fail: |
1435 | scsi_remove_host(shost); | |
1436 | add_host_fail: | |
7996a778 MC |
1437 | iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds); |
1438 | mgmtpool_alloc_fail: | |
1439 | iscsi_pool_free(&session->cmdpool, (void**)session->cmds); | |
1440 | cmdpool_alloc_fail: | |
1441 | scsi_host_put(shost); | |
1442 | return NULL; | |
1443 | } | |
1444 | EXPORT_SYMBOL_GPL(iscsi_session_setup); | |
1445 | ||
1446 | /** | |
1447 | * iscsi_session_teardown - destroy session, host, and cls_session | |
1448 | * shost: scsi host | |
1449 | * | |
1450 | * This can be used by software iscsi_transports that allocate | |
1451 | * a session per scsi host. | |
1452 | **/ | |
1453 | void iscsi_session_teardown(struct iscsi_cls_session *cls_session) | |
1454 | { | |
1455 | struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); | |
1456 | struct iscsi_session *session = iscsi_hostdata(shost->hostdata); | |
63f75cc8 | 1457 | struct module *owner = cls_session->transport->owner; |
7996a778 MC |
1458 | |
1459 | scsi_remove_host(shost); | |
1460 | ||
7996a778 MC |
1461 | iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds); |
1462 | iscsi_pool_free(&session->cmdpool, (void**)session->cmds); | |
1463 | ||
f3ff0c36 | 1464 | kfree(session->targetname); |
0801c242 | 1465 | kfree(session->hwaddress); |
8ad5781a | 1466 | kfree(session->initiatorname); |
f3ff0c36 | 1467 | |
7996a778 MC |
1468 | iscsi_destroy_session(cls_session); |
1469 | scsi_host_put(shost); | |
63f75cc8 | 1470 | module_put(owner); |
7996a778 MC |
1471 | } |
1472 | EXPORT_SYMBOL_GPL(iscsi_session_teardown); | |
1473 | ||
1474 | /** | |
1475 | * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn | |
1476 | * @cls_session: iscsi_cls_session | |
1477 | * @conn_idx: cid | |
1478 | **/ | |
1479 | struct iscsi_cls_conn * | |
1480 | iscsi_conn_setup(struct iscsi_cls_session *cls_session, uint32_t conn_idx) | |
1481 | { | |
1482 | struct iscsi_session *session = class_to_transport_session(cls_session); | |
1483 | struct iscsi_conn *conn; | |
1484 | struct iscsi_cls_conn *cls_conn; | |
d36ab6f3 | 1485 | char *data; |
7996a778 MC |
1486 | |
1487 | cls_conn = iscsi_create_conn(cls_session, conn_idx); | |
1488 | if (!cls_conn) | |
1489 | return NULL; | |
1490 | conn = cls_conn->dd_data; | |
1491 | memset(conn, 0, sizeof(*conn)); | |
1492 | ||
1493 | conn->session = session; | |
1494 | conn->cls_conn = cls_conn; | |
1495 | conn->c_stage = ISCSI_CONN_INITIAL_STAGE; | |
1496 | conn->id = conn_idx; | |
1497 | conn->exp_statsn = 0; | |
1498 | conn->tmabort_state = TMABORT_INITIAL; | |
1499 | INIT_LIST_HEAD(&conn->run_list); | |
1500 | INIT_LIST_HEAD(&conn->mgmt_run_list); | |
b6c395ed | 1501 | INIT_LIST_HEAD(&conn->xmitqueue); |
7996a778 MC |
1502 | |
1503 | /* initialize general immediate & non-immediate PDU commands queue */ | |
1504 | conn->immqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*), | |
1505 | GFP_KERNEL, NULL); | |
1506 | if (conn->immqueue == ERR_PTR(-ENOMEM)) | |
1507 | goto immqueue_alloc_fail; | |
1508 | ||
1509 | conn->mgmtqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*), | |
1510 | GFP_KERNEL, NULL); | |
1511 | if (conn->mgmtqueue == ERR_PTR(-ENOMEM)) | |
1512 | goto mgmtqueue_alloc_fail; | |
1513 | ||
c4028958 | 1514 | INIT_WORK(&conn->xmitwork, iscsi_xmitworker); |
7996a778 MC |
1515 | |
1516 | /* allocate login_mtask used for the login/text sequences */ | |
1517 | spin_lock_bh(&session->lock); | |
1518 | if (!__kfifo_get(session->mgmtpool.queue, | |
1519 | (void*)&conn->login_mtask, | |
1520 | sizeof(void*))) { | |
1521 | spin_unlock_bh(&session->lock); | |
1522 | goto login_mtask_alloc_fail; | |
1523 | } | |
1524 | spin_unlock_bh(&session->lock); | |
1525 | ||
bf32ed33 | 1526 | data = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN, GFP_KERNEL); |
d36ab6f3 MC |
1527 | if (!data) |
1528 | goto login_mtask_data_alloc_fail; | |
c8dc1e52 | 1529 | conn->login_mtask->data = conn->data = data; |
d36ab6f3 | 1530 | |
7996a778 MC |
1531 | init_timer(&conn->tmabort_timer); |
1532 | mutex_init(&conn->xmitmutex); | |
1533 | init_waitqueue_head(&conn->ehwait); | |
1534 | ||
1535 | return cls_conn; | |
1536 | ||
d36ab6f3 MC |
1537 | login_mtask_data_alloc_fail: |
1538 | __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask, | |
1539 | sizeof(void*)); | |
7996a778 MC |
1540 | login_mtask_alloc_fail: |
1541 | kfifo_free(conn->mgmtqueue); | |
1542 | mgmtqueue_alloc_fail: | |
1543 | kfifo_free(conn->immqueue); | |
1544 | immqueue_alloc_fail: | |
7996a778 MC |
1545 | iscsi_destroy_conn(cls_conn); |
1546 | return NULL; | |
1547 | } | |
1548 | EXPORT_SYMBOL_GPL(iscsi_conn_setup); | |
1549 | ||
1550 | /** | |
1551 | * iscsi_conn_teardown - teardown iscsi connection | |
1552 | * cls_conn: iscsi class connection | |
1553 | * | |
1554 | * TODO: we may need to make this into a two step process | |
1555 | * like scsi-mls remove + put host | |
1556 | */ | |
1557 | void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn) | |
1558 | { | |
1559 | struct iscsi_conn *conn = cls_conn->dd_data; | |
1560 | struct iscsi_session *session = conn->session; | |
1561 | unsigned long flags; | |
1562 | ||
7996a778 | 1563 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); |
67a61114 | 1564 | mutex_lock(&conn->xmitmutex); |
7996a778 MC |
1565 | |
1566 | spin_lock_bh(&session->lock); | |
1567 | conn->c_stage = ISCSI_CONN_CLEANUP_WAIT; | |
1568 | if (session->leadconn == conn) { | |
1569 | /* | |
1570 | * leading connection? then give up on recovery. | |
1571 | */ | |
1572 | session->state = ISCSI_STATE_TERMINATE; | |
1573 | wake_up(&conn->ehwait); | |
1574 | } | |
1575 | spin_unlock_bh(&session->lock); | |
1576 | ||
1577 | mutex_unlock(&conn->xmitmutex); | |
1578 | ||
1579 | /* | |
1580 | * Block until all in-progress commands for this connection | |
1581 | * time out or fail. | |
1582 | */ | |
1583 | for (;;) { | |
1584 | spin_lock_irqsave(session->host->host_lock, flags); | |
1585 | if (!session->host->host_busy) { /* OK for ERL == 0 */ | |
1586 | spin_unlock_irqrestore(session->host->host_lock, flags); | |
1587 | break; | |
1588 | } | |
1589 | spin_unlock_irqrestore(session->host->host_lock, flags); | |
1590 | msleep_interruptible(500); | |
be2df72e OG |
1591 | printk(KERN_INFO "iscsi: scsi conn_destroy(): host_busy %d " |
1592 | "host_failed %d\n", session->host->host_busy, | |
1593 | session->host->host_failed); | |
7996a778 MC |
1594 | /* |
1595 | * force eh_abort() to unblock | |
1596 | */ | |
1597 | wake_up(&conn->ehwait); | |
1598 | } | |
1599 | ||
779ea120 MC |
1600 | /* flush queued up work because we free the connection below */ |
1601 | scsi_flush_work(session->host); | |
1602 | ||
7996a778 | 1603 | spin_lock_bh(&session->lock); |
c8dc1e52 | 1604 | kfree(conn->data); |
f3ff0c36 | 1605 | kfree(conn->persistent_address); |
7996a778 MC |
1606 | __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask, |
1607 | sizeof(void*)); | |
98644047 | 1608 | if (session->leadconn == conn) { |
7996a778 | 1609 | session->leadconn = NULL; |
7996a778 MC |
1610 | /* no connections exits.. reset sequencing */ |
1611 | session->cmdsn = session->max_cmdsn = session->exp_cmdsn = 1; | |
98644047 | 1612 | } |
7996a778 MC |
1613 | spin_unlock_bh(&session->lock); |
1614 | ||
7996a778 MC |
1615 | kfifo_free(conn->immqueue); |
1616 | kfifo_free(conn->mgmtqueue); | |
1617 | ||
1618 | iscsi_destroy_conn(cls_conn); | |
1619 | } | |
1620 | EXPORT_SYMBOL_GPL(iscsi_conn_teardown); | |
1621 | ||
1622 | int iscsi_conn_start(struct iscsi_cls_conn *cls_conn) | |
1623 | { | |
1624 | struct iscsi_conn *conn = cls_conn->dd_data; | |
1625 | struct iscsi_session *session = conn->session; | |
1626 | ||
ffd0436e | 1627 | if (!session) { |
7996a778 MC |
1628 | printk(KERN_ERR "iscsi: can't start unbound connection\n"); |
1629 | return -EPERM; | |
1630 | } | |
1631 | ||
db98ccde MC |
1632 | if ((session->imm_data_en || !session->initial_r2t_en) && |
1633 | session->first_burst > session->max_burst) { | |
ffd0436e MC |
1634 | printk("iscsi: invalid burst lengths: " |
1635 | "first_burst %d max_burst %d\n", | |
1636 | session->first_burst, session->max_burst); | |
1637 | return -EINVAL; | |
1638 | } | |
1639 | ||
7996a778 MC |
1640 | spin_lock_bh(&session->lock); |
1641 | conn->c_stage = ISCSI_CONN_STARTED; | |
1642 | session->state = ISCSI_STATE_LOGGED_IN; | |
1643 | ||
1644 | switch(conn->stop_stage) { | |
1645 | case STOP_CONN_RECOVER: | |
1646 | /* | |
1647 | * unblock eh_abort() if it is blocked. re-try all | |
1648 | * commands after successful recovery | |
1649 | */ | |
7996a778 MC |
1650 | conn->stop_stage = 0; |
1651 | conn->tmabort_state = TMABORT_INITIAL; | |
1652 | session->age++; | |
7996a778 MC |
1653 | spin_unlock_bh(&session->lock); |
1654 | ||
1655 | iscsi_unblock_session(session_to_cls(session)); | |
1656 | wake_up(&conn->ehwait); | |
1657 | return 0; | |
1658 | case STOP_CONN_TERM: | |
7996a778 | 1659 | conn->stop_stage = 0; |
7996a778 MC |
1660 | break; |
1661 | default: | |
1662 | break; | |
1663 | } | |
1664 | spin_unlock_bh(&session->lock); | |
1665 | ||
1666 | return 0; | |
1667 | } | |
1668 | EXPORT_SYMBOL_GPL(iscsi_conn_start); | |
1669 | ||
1670 | static void | |
1671 | flush_control_queues(struct iscsi_session *session, struct iscsi_conn *conn) | |
1672 | { | |
1673 | struct iscsi_mgmt_task *mtask, *tmp; | |
1674 | ||
1675 | /* handle pending */ | |
1676 | while (__kfifo_get(conn->immqueue, (void*)&mtask, sizeof(void*)) || | |
1677 | __kfifo_get(conn->mgmtqueue, (void*)&mtask, sizeof(void*))) { | |
1678 | if (mtask == conn->login_mtask) | |
1679 | continue; | |
1680 | debug_scsi("flushing pending mgmt task itt 0x%x\n", mtask->itt); | |
1681 | __kfifo_put(session->mgmtpool.queue, (void*)&mtask, | |
1682 | sizeof(void*)); | |
1683 | } | |
1684 | ||
1685 | /* handle running */ | |
1686 | list_for_each_entry_safe(mtask, tmp, &conn->mgmt_run_list, running) { | |
1687 | debug_scsi("flushing running mgmt task itt 0x%x\n", mtask->itt); | |
ed2abc7f MC |
1688 | list_del(&mtask->running); |
1689 | ||
7996a778 MC |
1690 | if (mtask == conn->login_mtask) |
1691 | continue; | |
ed2abc7f | 1692 | __kfifo_put(session->mgmtpool.queue, (void*)&mtask, |
7996a778 MC |
1693 | sizeof(void*)); |
1694 | } | |
1695 | ||
1696 | conn->mtask = NULL; | |
1697 | } | |
1698 | ||
1699 | /* Fail commands. Mutex and session lock held and recv side suspended */ | |
1700 | static void fail_all_commands(struct iscsi_conn *conn) | |
1701 | { | |
1702 | struct iscsi_cmd_task *ctask, *tmp; | |
1703 | ||
1704 | /* flush pending */ | |
b6c395ed | 1705 | list_for_each_entry_safe(ctask, tmp, &conn->xmitqueue, running) { |
7996a778 MC |
1706 | debug_scsi("failing pending sc %p itt 0x%x\n", ctask->sc, |
1707 | ctask->itt); | |
1708 | fail_command(conn, ctask, DID_BUS_BUSY << 16); | |
1709 | } | |
1710 | ||
1711 | /* fail all other running */ | |
1712 | list_for_each_entry_safe(ctask, tmp, &conn->run_list, running) { | |
1713 | debug_scsi("failing in progress sc %p itt 0x%x\n", | |
1714 | ctask->sc, ctask->itt); | |
1715 | fail_command(conn, ctask, DID_BUS_BUSY << 16); | |
1716 | } | |
1717 | ||
1718 | conn->ctask = NULL; | |
1719 | } | |
1720 | ||
656cffc9 MC |
1721 | static void iscsi_start_session_recovery(struct iscsi_session *session, |
1722 | struct iscsi_conn *conn, int flag) | |
7996a778 | 1723 | { |
ed2abc7f MC |
1724 | int old_stop_stage; |
1725 | ||
7996a778 | 1726 | spin_lock_bh(&session->lock); |
ed2abc7f | 1727 | if (conn->stop_stage == STOP_CONN_TERM) { |
7996a778 MC |
1728 | spin_unlock_bh(&session->lock); |
1729 | return; | |
1730 | } | |
ed2abc7f MC |
1731 | |
1732 | /* | |
1733 | * When this is called for the in_login state, we only want to clean | |
67a61114 MC |
1734 | * up the login task and connection. We do not need to block and set |
1735 | * the recovery state again | |
ed2abc7f | 1736 | */ |
67a61114 MC |
1737 | if (flag == STOP_CONN_TERM) |
1738 | session->state = ISCSI_STATE_TERMINATE; | |
1739 | else if (conn->stop_stage != STOP_CONN_RECOVER) | |
1740 | session->state = ISCSI_STATE_IN_RECOVERY; | |
ed2abc7f MC |
1741 | |
1742 | old_stop_stage = conn->stop_stage; | |
7996a778 | 1743 | conn->stop_stage = flag; |
67a61114 MC |
1744 | conn->c_stage = ISCSI_CONN_STOPPED; |
1745 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
7996a778 MC |
1746 | spin_unlock_bh(&session->lock); |
1747 | ||
1c83469d MC |
1748 | write_lock_bh(conn->recv_lock); |
1749 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
1750 | write_unlock_bh(conn->recv_lock); | |
7996a778 MC |
1751 | |
1752 | mutex_lock(&conn->xmitmutex); | |
7996a778 MC |
1753 | /* |
1754 | * for connection level recovery we should not calculate | |
1755 | * header digest. conn->hdr_size used for optimization | |
1756 | * in hdr_extract() and will be re-negotiated at | |
1757 | * set_param() time. | |
1758 | */ | |
1759 | if (flag == STOP_CONN_RECOVER) { | |
1760 | conn->hdrdgst_en = 0; | |
1761 | conn->datadgst_en = 0; | |
656cffc9 | 1762 | if (session->state == ISCSI_STATE_IN_RECOVERY && |
67a61114 MC |
1763 | old_stop_stage != STOP_CONN_RECOVER) { |
1764 | debug_scsi("blocking session\n"); | |
7996a778 | 1765 | iscsi_block_session(session_to_cls(session)); |
67a61114 | 1766 | } |
7996a778 | 1767 | } |
656cffc9 | 1768 | |
656cffc9 MC |
1769 | /* |
1770 | * flush queues. | |
1771 | */ | |
1772 | spin_lock_bh(&session->lock); | |
1773 | fail_all_commands(conn); | |
1774 | flush_control_queues(session, conn); | |
1775 | spin_unlock_bh(&session->lock); | |
1776 | ||
7996a778 MC |
1777 | mutex_unlock(&conn->xmitmutex); |
1778 | } | |
7996a778 MC |
1779 | |
1780 | void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) | |
1781 | { | |
1782 | struct iscsi_conn *conn = cls_conn->dd_data; | |
1783 | struct iscsi_session *session = conn->session; | |
1784 | ||
1785 | switch (flag) { | |
1786 | case STOP_CONN_RECOVER: | |
1787 | case STOP_CONN_TERM: | |
1788 | iscsi_start_session_recovery(session, conn, flag); | |
8d2860b3 | 1789 | break; |
7996a778 | 1790 | default: |
be2df72e | 1791 | printk(KERN_ERR "iscsi: invalid stop flag %d\n", flag); |
7996a778 MC |
1792 | } |
1793 | } | |
1794 | EXPORT_SYMBOL_GPL(iscsi_conn_stop); | |
1795 | ||
1796 | int iscsi_conn_bind(struct iscsi_cls_session *cls_session, | |
1797 | struct iscsi_cls_conn *cls_conn, int is_leading) | |
1798 | { | |
1799 | struct iscsi_session *session = class_to_transport_session(cls_session); | |
98644047 | 1800 | struct iscsi_conn *conn = cls_conn->dd_data; |
7996a778 | 1801 | |
7996a778 | 1802 | spin_lock_bh(&session->lock); |
7996a778 MC |
1803 | if (is_leading) |
1804 | session->leadconn = conn; | |
98644047 | 1805 | spin_unlock_bh(&session->lock); |
7996a778 MC |
1806 | |
1807 | /* | |
1808 | * Unblock xmitworker(), Login Phase will pass through. | |
1809 | */ | |
1810 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
1811 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
1812 | return 0; | |
1813 | } | |
1814 | EXPORT_SYMBOL_GPL(iscsi_conn_bind); | |
1815 | ||
a54a52ca MC |
1816 | |
1817 | int iscsi_set_param(struct iscsi_cls_conn *cls_conn, | |
1818 | enum iscsi_param param, char *buf, int buflen) | |
1819 | { | |
1820 | struct iscsi_conn *conn = cls_conn->dd_data; | |
1821 | struct iscsi_session *session = conn->session; | |
1822 | uint32_t value; | |
1823 | ||
1824 | switch(param) { | |
1825 | case ISCSI_PARAM_MAX_RECV_DLENGTH: | |
1826 | sscanf(buf, "%d", &conn->max_recv_dlength); | |
1827 | break; | |
1828 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
1829 | sscanf(buf, "%d", &conn->max_xmit_dlength); | |
1830 | break; | |
1831 | case ISCSI_PARAM_HDRDGST_EN: | |
1832 | sscanf(buf, "%d", &conn->hdrdgst_en); | |
1833 | break; | |
1834 | case ISCSI_PARAM_DATADGST_EN: | |
1835 | sscanf(buf, "%d", &conn->datadgst_en); | |
1836 | break; | |
1837 | case ISCSI_PARAM_INITIAL_R2T_EN: | |
1838 | sscanf(buf, "%d", &session->initial_r2t_en); | |
1839 | break; | |
1840 | case ISCSI_PARAM_MAX_R2T: | |
1841 | sscanf(buf, "%d", &session->max_r2t); | |
1842 | break; | |
1843 | case ISCSI_PARAM_IMM_DATA_EN: | |
1844 | sscanf(buf, "%d", &session->imm_data_en); | |
1845 | break; | |
1846 | case ISCSI_PARAM_FIRST_BURST: | |
1847 | sscanf(buf, "%d", &session->first_burst); | |
1848 | break; | |
1849 | case ISCSI_PARAM_MAX_BURST: | |
1850 | sscanf(buf, "%d", &session->max_burst); | |
1851 | break; | |
1852 | case ISCSI_PARAM_PDU_INORDER_EN: | |
1853 | sscanf(buf, "%d", &session->pdu_inorder_en); | |
1854 | break; | |
1855 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
1856 | sscanf(buf, "%d", &session->dataseq_inorder_en); | |
1857 | break; | |
1858 | case ISCSI_PARAM_ERL: | |
1859 | sscanf(buf, "%d", &session->erl); | |
1860 | break; | |
1861 | case ISCSI_PARAM_IFMARKER_EN: | |
1862 | sscanf(buf, "%d", &value); | |
1863 | BUG_ON(value); | |
1864 | break; | |
1865 | case ISCSI_PARAM_OFMARKER_EN: | |
1866 | sscanf(buf, "%d", &value); | |
1867 | BUG_ON(value); | |
1868 | break; | |
1869 | case ISCSI_PARAM_EXP_STATSN: | |
1870 | sscanf(buf, "%u", &conn->exp_statsn); | |
1871 | break; | |
1872 | case ISCSI_PARAM_TARGET_NAME: | |
1873 | /* this should not change between logins */ | |
1874 | if (session->targetname) | |
1875 | break; | |
1876 | ||
1877 | session->targetname = kstrdup(buf, GFP_KERNEL); | |
1878 | if (!session->targetname) | |
1879 | return -ENOMEM; | |
1880 | break; | |
1881 | case ISCSI_PARAM_TPGT: | |
1882 | sscanf(buf, "%d", &session->tpgt); | |
1883 | break; | |
1884 | case ISCSI_PARAM_PERSISTENT_PORT: | |
1885 | sscanf(buf, "%d", &conn->persistent_port); | |
1886 | break; | |
1887 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
1888 | /* | |
1889 | * this is the address returned in discovery so it should | |
1890 | * not change between logins. | |
1891 | */ | |
1892 | if (conn->persistent_address) | |
1893 | break; | |
1894 | ||
1895 | conn->persistent_address = kstrdup(buf, GFP_KERNEL); | |
1896 | if (!conn->persistent_address) | |
1897 | return -ENOMEM; | |
1898 | break; | |
1899 | default: | |
1900 | return -ENOSYS; | |
1901 | } | |
1902 | ||
1903 | return 0; | |
1904 | } | |
1905 | EXPORT_SYMBOL_GPL(iscsi_set_param); | |
1906 | ||
1907 | int iscsi_session_get_param(struct iscsi_cls_session *cls_session, | |
1908 | enum iscsi_param param, char *buf) | |
1909 | { | |
1910 | struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); | |
1911 | struct iscsi_session *session = iscsi_hostdata(shost->hostdata); | |
1912 | int len; | |
1913 | ||
1914 | switch(param) { | |
1915 | case ISCSI_PARAM_INITIAL_R2T_EN: | |
1916 | len = sprintf(buf, "%d\n", session->initial_r2t_en); | |
1917 | break; | |
1918 | case ISCSI_PARAM_MAX_R2T: | |
1919 | len = sprintf(buf, "%hu\n", session->max_r2t); | |
1920 | break; | |
1921 | case ISCSI_PARAM_IMM_DATA_EN: | |
1922 | len = sprintf(buf, "%d\n", session->imm_data_en); | |
1923 | break; | |
1924 | case ISCSI_PARAM_FIRST_BURST: | |
1925 | len = sprintf(buf, "%u\n", session->first_burst); | |
1926 | break; | |
1927 | case ISCSI_PARAM_MAX_BURST: | |
1928 | len = sprintf(buf, "%u\n", session->max_burst); | |
1929 | break; | |
1930 | case ISCSI_PARAM_PDU_INORDER_EN: | |
1931 | len = sprintf(buf, "%d\n", session->pdu_inorder_en); | |
1932 | break; | |
1933 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
1934 | len = sprintf(buf, "%d\n", session->dataseq_inorder_en); | |
1935 | break; | |
1936 | case ISCSI_PARAM_ERL: | |
1937 | len = sprintf(buf, "%d\n", session->erl); | |
1938 | break; | |
1939 | case ISCSI_PARAM_TARGET_NAME: | |
1940 | len = sprintf(buf, "%s\n", session->targetname); | |
1941 | break; | |
1942 | case ISCSI_PARAM_TPGT: | |
1943 | len = sprintf(buf, "%d\n", session->tpgt); | |
1944 | break; | |
1945 | default: | |
1946 | return -ENOSYS; | |
1947 | } | |
1948 | ||
1949 | return len; | |
1950 | } | |
1951 | EXPORT_SYMBOL_GPL(iscsi_session_get_param); | |
1952 | ||
1953 | int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn, | |
1954 | enum iscsi_param param, char *buf) | |
1955 | { | |
1956 | struct iscsi_conn *conn = cls_conn->dd_data; | |
1957 | int len; | |
1958 | ||
1959 | switch(param) { | |
1960 | case ISCSI_PARAM_MAX_RECV_DLENGTH: | |
1961 | len = sprintf(buf, "%u\n", conn->max_recv_dlength); | |
1962 | break; | |
1963 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
1964 | len = sprintf(buf, "%u\n", conn->max_xmit_dlength); | |
1965 | break; | |
1966 | case ISCSI_PARAM_HDRDGST_EN: | |
1967 | len = sprintf(buf, "%d\n", conn->hdrdgst_en); | |
1968 | break; | |
1969 | case ISCSI_PARAM_DATADGST_EN: | |
1970 | len = sprintf(buf, "%d\n", conn->datadgst_en); | |
1971 | break; | |
1972 | case ISCSI_PARAM_IFMARKER_EN: | |
1973 | len = sprintf(buf, "%d\n", conn->ifmarker_en); | |
1974 | break; | |
1975 | case ISCSI_PARAM_OFMARKER_EN: | |
1976 | len = sprintf(buf, "%d\n", conn->ofmarker_en); | |
1977 | break; | |
1978 | case ISCSI_PARAM_EXP_STATSN: | |
1979 | len = sprintf(buf, "%u\n", conn->exp_statsn); | |
1980 | break; | |
1981 | case ISCSI_PARAM_PERSISTENT_PORT: | |
1982 | len = sprintf(buf, "%d\n", conn->persistent_port); | |
1983 | break; | |
1984 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
1985 | len = sprintf(buf, "%s\n", conn->persistent_address); | |
1986 | break; | |
1987 | default: | |
1988 | return -ENOSYS; | |
1989 | } | |
1990 | ||
1991 | return len; | |
1992 | } | |
1993 | EXPORT_SYMBOL_GPL(iscsi_conn_get_param); | |
1994 | ||
0801c242 MC |
1995 | int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param, |
1996 | char *buf) | |
1997 | { | |
1998 | struct iscsi_session *session = iscsi_hostdata(shost->hostdata); | |
1999 | int len; | |
2000 | ||
2001 | switch (param) { | |
2002 | case ISCSI_HOST_PARAM_HWADDRESS: | |
2003 | if (!session->hwaddress) | |
2004 | len = sprintf(buf, "%s\n", "default"); | |
2005 | else | |
2006 | len = sprintf(buf, "%s\n", session->hwaddress); | |
2007 | break; | |
8ad5781a MC |
2008 | case ISCSI_HOST_PARAM_INITIATOR_NAME: |
2009 | if (!session->initiatorname) | |
2010 | len = sprintf(buf, "%s\n", "unknown"); | |
2011 | else | |
2012 | len = sprintf(buf, "%s\n", session->initiatorname); | |
2013 | break; | |
2014 | ||
0801c242 MC |
2015 | default: |
2016 | return -ENOSYS; | |
2017 | } | |
2018 | ||
2019 | return len; | |
2020 | } | |
2021 | EXPORT_SYMBOL_GPL(iscsi_host_get_param); | |
2022 | ||
2023 | int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param, | |
2024 | char *buf, int buflen) | |
2025 | { | |
2026 | struct iscsi_session *session = iscsi_hostdata(shost->hostdata); | |
2027 | ||
2028 | switch (param) { | |
2029 | case ISCSI_HOST_PARAM_HWADDRESS: | |
2030 | if (!session->hwaddress) | |
2031 | session->hwaddress = kstrdup(buf, GFP_KERNEL); | |
2032 | break; | |
8ad5781a MC |
2033 | case ISCSI_HOST_PARAM_INITIATOR_NAME: |
2034 | if (!session->initiatorname) | |
2035 | session->initiatorname = kstrdup(buf, GFP_KERNEL); | |
2036 | break; | |
0801c242 MC |
2037 | default: |
2038 | return -ENOSYS; | |
2039 | } | |
2040 | ||
2041 | return 0; | |
2042 | } | |
2043 | EXPORT_SYMBOL_GPL(iscsi_host_set_param); | |
2044 | ||
7996a778 MC |
2045 | MODULE_AUTHOR("Mike Christie"); |
2046 | MODULE_DESCRIPTION("iSCSI library functions"); | |
2047 | MODULE_LICENSE("GPL"); |