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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> | |
7996a778 MC |
25 | #include <linux/kfifo.h> |
26 | #include <linux/delay.h> | |
11836572 | 27 | #include <linux/log2.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 | ||
77a23c21 MC |
49 | /* Serial Number Arithmetic, 32 bits, less than, RFC1982 */ |
50 | #define SNA32_CHECK 2147483648UL | |
7996a778 | 51 | |
77a23c21 MC |
52 | static int iscsi_sna_lt(u32 n1, u32 n2) |
53 | { | |
54 | return n1 != n2 && ((n1 < n2 && (n2 - n1 < SNA32_CHECK)) || | |
55 | (n1 > n2 && (n2 - n1 < SNA32_CHECK))); | |
56 | } | |
57 | ||
58 | /* Serial Number Arithmetic, 32 bits, less than, RFC1982 */ | |
59 | static int iscsi_sna_lte(u32 n1, u32 n2) | |
60 | { | |
61 | return n1 == n2 || ((n1 < n2 && (n2 - n1 < SNA32_CHECK)) || | |
62 | (n1 > n2 && (n2 - n1 < SNA32_CHECK))); | |
63 | } | |
64 | ||
65 | void | |
66 | iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr) | |
7996a778 MC |
67 | { |
68 | uint32_t max_cmdsn = be32_to_cpu(hdr->max_cmdsn); | |
69 | uint32_t exp_cmdsn = be32_to_cpu(hdr->exp_cmdsn); | |
70 | ||
77a23c21 MC |
71 | /* |
72 | * standard specifies this check for when to update expected and | |
73 | * max sequence numbers | |
74 | */ | |
75 | if (iscsi_sna_lt(max_cmdsn, exp_cmdsn - 1)) | |
76 | return; | |
77 | ||
78 | if (exp_cmdsn != session->exp_cmdsn && | |
79 | !iscsi_sna_lt(exp_cmdsn, session->exp_cmdsn)) | |
7996a778 MC |
80 | session->exp_cmdsn = exp_cmdsn; |
81 | ||
77a23c21 MC |
82 | if (max_cmdsn != session->max_cmdsn && |
83 | !iscsi_sna_lt(max_cmdsn, session->max_cmdsn)) { | |
84 | session->max_cmdsn = max_cmdsn; | |
85 | /* | |
86 | * if the window closed with IO queued, then kick the | |
87 | * xmit thread | |
88 | */ | |
89 | if (!list_empty(&session->leadconn->xmitqueue) || | |
843c0a8a | 90 | !list_empty(&session->leadconn->mgmtqueue)) |
77a23c21 MC |
91 | scsi_queue_work(session->host, |
92 | &session->leadconn->xmitwork); | |
93 | } | |
7996a778 | 94 | } |
77a23c21 | 95 | EXPORT_SYMBOL_GPL(iscsi_update_cmdsn); |
7996a778 MC |
96 | |
97 | void iscsi_prep_unsolicit_data_pdu(struct iscsi_cmd_task *ctask, | |
ffd0436e | 98 | struct iscsi_data *hdr) |
7996a778 MC |
99 | { |
100 | struct iscsi_conn *conn = ctask->conn; | |
101 | ||
102 | memset(hdr, 0, sizeof(struct iscsi_data)); | |
103 | hdr->ttt = cpu_to_be32(ISCSI_RESERVED_TAG); | |
104 | hdr->datasn = cpu_to_be32(ctask->unsol_datasn); | |
105 | ctask->unsol_datasn++; | |
106 | hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; | |
107 | memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); | |
108 | ||
109 | hdr->itt = ctask->hdr->itt; | |
110 | hdr->exp_statsn = cpu_to_be32(conn->exp_statsn); | |
ffd0436e | 111 | hdr->offset = cpu_to_be32(ctask->unsol_offset); |
7996a778 MC |
112 | |
113 | if (ctask->unsol_count > conn->max_xmit_dlength) { | |
114 | hton24(hdr->dlength, conn->max_xmit_dlength); | |
115 | ctask->data_count = conn->max_xmit_dlength; | |
ffd0436e | 116 | ctask->unsol_offset += ctask->data_count; |
7996a778 MC |
117 | hdr->flags = 0; |
118 | } else { | |
119 | hton24(hdr->dlength, ctask->unsol_count); | |
120 | ctask->data_count = ctask->unsol_count; | |
121 | hdr->flags = ISCSI_FLAG_CMD_FINAL; | |
122 | } | |
123 | } | |
124 | EXPORT_SYMBOL_GPL(iscsi_prep_unsolicit_data_pdu); | |
125 | ||
004d6530 BH |
126 | static int iscsi_add_hdr(struct iscsi_cmd_task *ctask, unsigned len) |
127 | { | |
128 | unsigned exp_len = ctask->hdr_len + len; | |
129 | ||
130 | if (exp_len > ctask->hdr_max) { | |
131 | WARN_ON(1); | |
132 | return -EINVAL; | |
133 | } | |
134 | ||
135 | WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */ | |
136 | ctask->hdr_len = exp_len; | |
137 | return 0; | |
138 | } | |
139 | ||
38d1c069 BH |
140 | /* |
141 | * make an extended cdb AHS | |
142 | */ | |
143 | static int iscsi_prep_ecdb_ahs(struct iscsi_cmd_task *ctask) | |
144 | { | |
145 | struct scsi_cmnd *cmd = ctask->sc; | |
146 | unsigned rlen, pad_len; | |
147 | unsigned short ahslength; | |
148 | struct iscsi_ecdb_ahdr *ecdb_ahdr; | |
149 | int rc; | |
150 | ||
151 | ecdb_ahdr = iscsi_next_hdr(ctask); | |
152 | rlen = cmd->cmd_len - ISCSI_CDB_SIZE; | |
153 | ||
154 | BUG_ON(rlen > sizeof(ecdb_ahdr->ecdb)); | |
155 | ahslength = rlen + sizeof(ecdb_ahdr->reserved); | |
156 | ||
157 | pad_len = iscsi_padding(rlen); | |
158 | ||
159 | rc = iscsi_add_hdr(ctask, sizeof(ecdb_ahdr->ahslength) + | |
160 | sizeof(ecdb_ahdr->ahstype) + ahslength + pad_len); | |
161 | if (rc) | |
162 | return rc; | |
163 | ||
164 | if (pad_len) | |
165 | memset(&ecdb_ahdr->ecdb[rlen], 0, pad_len); | |
166 | ||
167 | ecdb_ahdr->ahslength = cpu_to_be16(ahslength); | |
168 | ecdb_ahdr->ahstype = ISCSI_AHSTYPE_CDB; | |
169 | ecdb_ahdr->reserved = 0; | |
170 | memcpy(ecdb_ahdr->ecdb, cmd->cmnd + ISCSI_CDB_SIZE, rlen); | |
171 | ||
172 | debug_scsi("iscsi_prep_ecdb_ahs: varlen_cdb_len %d " | |
173 | "rlen %d pad_len %d ahs_length %d iscsi_headers_size %u\n", | |
174 | cmd->cmd_len, rlen, pad_len, ahslength, ctask->hdr_len); | |
175 | ||
176 | return 0; | |
177 | } | |
178 | ||
c07d4444 BH |
179 | static int iscsi_prep_bidi_ahs(struct iscsi_cmd_task *ctask) |
180 | { | |
181 | struct scsi_cmnd *sc = ctask->sc; | |
182 | struct iscsi_rlength_ahdr *rlen_ahdr; | |
183 | int rc; | |
184 | ||
185 | rlen_ahdr = iscsi_next_hdr(ctask); | |
186 | rc = iscsi_add_hdr(ctask, sizeof(*rlen_ahdr)); | |
187 | if (rc) | |
188 | return rc; | |
189 | ||
190 | rlen_ahdr->ahslength = | |
191 | cpu_to_be16(sizeof(rlen_ahdr->read_length) + | |
192 | sizeof(rlen_ahdr->reserved)); | |
193 | rlen_ahdr->ahstype = ISCSI_AHSTYPE_RLENGTH; | |
194 | rlen_ahdr->reserved = 0; | |
195 | rlen_ahdr->read_length = cpu_to_be32(scsi_in(sc)->length); | |
196 | ||
197 | debug_scsi("bidi-in rlen_ahdr->read_length(%d) " | |
198 | "rlen_ahdr->ahslength(%d)\n", | |
199 | be32_to_cpu(rlen_ahdr->read_length), | |
200 | be16_to_cpu(rlen_ahdr->ahslength)); | |
201 | return 0; | |
202 | } | |
203 | ||
7996a778 MC |
204 | /** |
205 | * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu | |
206 | * @ctask: iscsi cmd task | |
207 | * | |
208 | * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set | |
209 | * fields like dlength or final based on how much data it sends | |
210 | */ | |
004d6530 | 211 | static int iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask) |
7996a778 MC |
212 | { |
213 | struct iscsi_conn *conn = ctask->conn; | |
214 | struct iscsi_session *session = conn->session; | |
215 | struct iscsi_cmd *hdr = ctask->hdr; | |
216 | struct scsi_cmnd *sc = ctask->sc; | |
38d1c069 | 217 | unsigned hdrlength, cmd_len; |
004d6530 | 218 | int rc; |
7996a778 | 219 | |
004d6530 BH |
220 | ctask->hdr_len = 0; |
221 | rc = iscsi_add_hdr(ctask, sizeof(*hdr)); | |
222 | if (rc) | |
223 | return rc; | |
a8ac6311 OK |
224 | hdr->opcode = ISCSI_OP_SCSI_CMD; |
225 | hdr->flags = ISCSI_ATTR_SIMPLE; | |
226 | int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun); | |
8b1d0343 | 227 | hdr->itt = build_itt(ctask->itt, session->age); |
a8ac6311 OK |
228 | hdr->cmdsn = cpu_to_be32(session->cmdsn); |
229 | session->cmdsn++; | |
230 | hdr->exp_statsn = cpu_to_be32(conn->exp_statsn); | |
38d1c069 BH |
231 | cmd_len = sc->cmd_len; |
232 | if (cmd_len < ISCSI_CDB_SIZE) | |
233 | memset(&hdr->cdb[cmd_len], 0, ISCSI_CDB_SIZE - cmd_len); | |
234 | else if (cmd_len > ISCSI_CDB_SIZE) { | |
235 | rc = iscsi_prep_ecdb_ahs(ctask); | |
236 | if (rc) | |
237 | return rc; | |
238 | cmd_len = ISCSI_CDB_SIZE; | |
239 | } | |
240 | memcpy(hdr->cdb, sc->cmnd, cmd_len); | |
7996a778 | 241 | |
218432c6 | 242 | ctask->imm_count = 0; |
c07d4444 BH |
243 | if (scsi_bidi_cmnd(sc)) { |
244 | hdr->flags |= ISCSI_FLAG_CMD_READ; | |
245 | rc = iscsi_prep_bidi_ahs(ctask); | |
246 | if (rc) | |
247 | return rc; | |
248 | } | |
7996a778 | 249 | if (sc->sc_data_direction == DMA_TO_DEVICE) { |
c07d4444 BH |
250 | unsigned out_len = scsi_out(sc)->length; |
251 | hdr->data_length = cpu_to_be32(out_len); | |
7996a778 MC |
252 | hdr->flags |= ISCSI_FLAG_CMD_WRITE; |
253 | /* | |
254 | * Write counters: | |
255 | * | |
256 | * imm_count bytes to be sent right after | |
257 | * SCSI PDU Header | |
258 | * | |
259 | * unsol_count bytes(as Data-Out) to be sent | |
260 | * without R2T ack right after | |
261 | * immediate data | |
262 | * | |
263 | * r2t_data_count bytes to be sent via R2T ack's | |
264 | * | |
265 | * pad_count bytes to be sent as zero-padding | |
266 | */ | |
7996a778 | 267 | ctask->unsol_count = 0; |
ffd0436e | 268 | ctask->unsol_offset = 0; |
7996a778 MC |
269 | ctask->unsol_datasn = 0; |
270 | ||
271 | if (session->imm_data_en) { | |
c07d4444 | 272 | if (out_len >= session->first_burst) |
7996a778 MC |
273 | ctask->imm_count = min(session->first_burst, |
274 | conn->max_xmit_dlength); | |
275 | else | |
c07d4444 | 276 | ctask->imm_count = min(out_len, |
7996a778 | 277 | conn->max_xmit_dlength); |
a8ac6311 | 278 | hton24(hdr->dlength, ctask->imm_count); |
7996a778 | 279 | } else |
a8ac6311 | 280 | zero_data(hdr->dlength); |
7996a778 | 281 | |
ffd0436e | 282 | if (!session->initial_r2t_en) { |
c07d4444 BH |
283 | ctask->unsol_count = min(session->first_burst, out_len) |
284 | - ctask->imm_count; | |
ffd0436e MC |
285 | ctask->unsol_offset = ctask->imm_count; |
286 | } | |
287 | ||
7996a778 MC |
288 | if (!ctask->unsol_count) |
289 | /* No unsolicit Data-Out's */ | |
a8ac6311 | 290 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; |
7996a778 | 291 | } else { |
7996a778 MC |
292 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; |
293 | zero_data(hdr->dlength); | |
c07d4444 | 294 | hdr->data_length = cpu_to_be32(scsi_in(sc)->length); |
7996a778 MC |
295 | |
296 | if (sc->sc_data_direction == DMA_FROM_DEVICE) | |
297 | hdr->flags |= ISCSI_FLAG_CMD_READ; | |
298 | } | |
299 | ||
004d6530 BH |
300 | /* calculate size of additional header segments (AHSs) */ |
301 | hdrlength = ctask->hdr_len - sizeof(*hdr); | |
302 | ||
303 | WARN_ON(hdrlength & (ISCSI_PAD_LEN-1)); | |
304 | hdrlength /= ISCSI_PAD_LEN; | |
305 | ||
306 | WARN_ON(hdrlength >= 256); | |
307 | hdr->hlength = hdrlength & 0xFF; | |
308 | ||
a8ac6311 OK |
309 | if (conn->session->tt->init_cmd_task(conn->ctask)) |
310 | return EIO; | |
77a23c21 | 311 | |
a8ac6311 | 312 | conn->scsicmd_pdus_cnt++; |
c07d4444 BH |
313 | debug_scsi("iscsi prep [%s cid %d sc %p cdb 0x%x itt 0x%x " |
314 | "len %d bidi_len %d cmdsn %d win %d]\n", | |
315 | scsi_bidi_cmnd(sc) ? "bidirectional" : | |
316 | sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read", | |
317 | conn->id, sc, sc->cmnd[0], ctask->itt, | |
318 | scsi_bufflen(sc), scsi_bidi_cmnd(sc) ? scsi_in(sc)->length : 0, | |
a8ac6311 | 319 | session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1); |
004d6530 | 320 | return 0; |
7996a778 | 321 | } |
7996a778 MC |
322 | |
323 | /** | |
324 | * iscsi_complete_command - return command back to scsi-ml | |
7996a778 MC |
325 | * @ctask: iscsi cmd task |
326 | * | |
327 | * Must be called with session lock. | |
328 | * This function returns the scsi command to scsi-ml and returns | |
329 | * the cmd task to the pool of available cmd tasks. | |
330 | */ | |
60ecebf5 | 331 | static void iscsi_complete_command(struct iscsi_cmd_task *ctask) |
7996a778 | 332 | { |
c1635cb7 MC |
333 | struct iscsi_conn *conn = ctask->conn; |
334 | struct iscsi_session *session = conn->session; | |
7996a778 MC |
335 | struct scsi_cmnd *sc = ctask->sc; |
336 | ||
b6c395ed | 337 | ctask->state = ISCSI_TASK_COMPLETED; |
7996a778 | 338 | ctask->sc = NULL; |
f47f2cf5 MC |
339 | /* SCSI eh reuses commands to verify us */ |
340 | sc->SCp.ptr = NULL; | |
c1635cb7 MC |
341 | if (conn->ctask == ctask) |
342 | conn->ctask = NULL; | |
7996a778 MC |
343 | list_del_init(&ctask->running); |
344 | __kfifo_put(session->cmdpool.queue, (void*)&ctask, sizeof(void*)); | |
345 | sc->scsi_done(sc); | |
346 | } | |
347 | ||
60ecebf5 MC |
348 | static void __iscsi_get_ctask(struct iscsi_cmd_task *ctask) |
349 | { | |
350 | atomic_inc(&ctask->refcount); | |
351 | } | |
352 | ||
60ecebf5 MC |
353 | static void __iscsi_put_ctask(struct iscsi_cmd_task *ctask) |
354 | { | |
e648f63c | 355 | if (atomic_dec_and_test(&ctask->refcount)) |
60ecebf5 | 356 | iscsi_complete_command(ctask); |
60ecebf5 MC |
357 | } |
358 | ||
b3a7ea8d MC |
359 | /* |
360 | * session lock must be held | |
361 | */ | |
362 | static void fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, | |
363 | int err) | |
364 | { | |
365 | struct scsi_cmnd *sc; | |
366 | ||
367 | sc = ctask->sc; | |
368 | if (!sc) | |
369 | return; | |
370 | ||
371 | if (ctask->state == ISCSI_TASK_PENDING) | |
372 | /* | |
373 | * cmd never made it to the xmit thread, so we should not count | |
374 | * the cmd in the sequencing | |
375 | */ | |
376 | conn->session->queued_cmdsn--; | |
377 | else | |
378 | conn->session->tt->cleanup_cmd_task(conn, ctask); | |
379 | ||
380 | sc->result = err; | |
c07d4444 BH |
381 | if (!scsi_bidi_cmnd(sc)) |
382 | scsi_set_resid(sc, scsi_bufflen(sc)); | |
383 | else { | |
384 | scsi_out(sc)->resid = scsi_out(sc)->length; | |
385 | scsi_in(sc)->resid = scsi_in(sc)->length; | |
386 | } | |
b3a7ea8d MC |
387 | if (conn->ctask == ctask) |
388 | conn->ctask = NULL; | |
389 | /* release ref from queuecommand */ | |
390 | __iscsi_put_ctask(ctask); | |
391 | } | |
392 | ||
393 | /** | |
394 | * iscsi_free_mgmt_task - return mgmt task back to pool | |
395 | * @conn: iscsi connection | |
396 | * @mtask: mtask | |
397 | * | |
398 | * Must be called with session lock. | |
399 | */ | |
400 | void iscsi_free_mgmt_task(struct iscsi_conn *conn, | |
401 | struct iscsi_mgmt_task *mtask) | |
402 | { | |
403 | list_del_init(&mtask->running); | |
404 | if (conn->login_mtask == mtask) | |
405 | return; | |
f6d5180c MC |
406 | |
407 | if (conn->ping_mtask == mtask) | |
408 | conn->ping_mtask = NULL; | |
b3a7ea8d MC |
409 | __kfifo_put(conn->session->mgmtpool.queue, |
410 | (void*)&mtask, sizeof(void*)); | |
411 | } | |
412 | EXPORT_SYMBOL_GPL(iscsi_free_mgmt_task); | |
413 | ||
f6d5180c MC |
414 | static struct iscsi_mgmt_task * |
415 | __iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
416 | char *data, uint32_t data_size) | |
417 | { | |
418 | struct iscsi_session *session = conn->session; | |
419 | struct iscsi_mgmt_task *mtask; | |
420 | ||
421 | if (session->state == ISCSI_STATE_TERMINATE) | |
422 | return NULL; | |
423 | ||
424 | if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) || | |
425 | hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE)) | |
426 | /* | |
427 | * Login and Text are sent serially, in | |
428 | * request-followed-by-response sequence. | |
429 | * Same mtask can be used. Same ITT must be used. | |
430 | * Note that login_mtask is preallocated at conn_create(). | |
431 | */ | |
432 | mtask = conn->login_mtask; | |
433 | else { | |
434 | BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE); | |
435 | BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED); | |
436 | ||
437 | if (!__kfifo_get(session->mgmtpool.queue, | |
438 | (void*)&mtask, sizeof(void*))) | |
439 | return NULL; | |
440 | } | |
441 | ||
442 | if (data_size) { | |
443 | memcpy(mtask->data, data, data_size); | |
444 | mtask->data_count = data_size; | |
445 | } else | |
446 | mtask->data_count = 0; | |
447 | ||
448 | memcpy(mtask->hdr, hdr, sizeof(struct iscsi_hdr)); | |
449 | INIT_LIST_HEAD(&mtask->running); | |
450 | list_add_tail(&mtask->running, &conn->mgmtqueue); | |
451 | return mtask; | |
452 | } | |
453 | ||
454 | int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr, | |
455 | char *data, uint32_t data_size) | |
456 | { | |
457 | struct iscsi_conn *conn = cls_conn->dd_data; | |
458 | struct iscsi_session *session = conn->session; | |
459 | int err = 0; | |
460 | ||
461 | spin_lock_bh(&session->lock); | |
462 | if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size)) | |
463 | err = -EPERM; | |
464 | spin_unlock_bh(&session->lock); | |
465 | scsi_queue_work(session->host, &conn->xmitwork); | |
466 | return err; | |
467 | } | |
468 | EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu); | |
469 | ||
7996a778 MC |
470 | /** |
471 | * iscsi_cmd_rsp - SCSI Command Response processing | |
472 | * @conn: iscsi connection | |
473 | * @hdr: iscsi header | |
474 | * @ctask: scsi command task | |
475 | * @data: cmd data buffer | |
476 | * @datalen: len of buffer | |
477 | * | |
478 | * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and | |
479 | * then completes the command and task. | |
480 | **/ | |
77a23c21 MC |
481 | static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
482 | struct iscsi_cmd_task *ctask, char *data, | |
483 | int datalen) | |
7996a778 | 484 | { |
7996a778 MC |
485 | struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)hdr; |
486 | struct iscsi_session *session = conn->session; | |
487 | struct scsi_cmnd *sc = ctask->sc; | |
488 | ||
77a23c21 | 489 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr); |
7996a778 MC |
490 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; |
491 | ||
492 | sc->result = (DID_OK << 16) | rhdr->cmd_status; | |
493 | ||
494 | if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) { | |
495 | sc->result = DID_ERROR << 16; | |
496 | goto out; | |
497 | } | |
498 | ||
499 | if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) { | |
9b80cb4b | 500 | uint16_t senselen; |
7996a778 MC |
501 | |
502 | if (datalen < 2) { | |
503 | invalid_datalen: | |
322d739d MC |
504 | iscsi_conn_printk(KERN_ERR, conn, |
505 | "Got CHECK_CONDITION but invalid data " | |
506 | "buffer size of %d\n", datalen); | |
7996a778 MC |
507 | sc->result = DID_BAD_TARGET << 16; |
508 | goto out; | |
509 | } | |
510 | ||
8eb00539 | 511 | senselen = be16_to_cpu(get_unaligned((__be16 *) data)); |
7996a778 MC |
512 | if (datalen < senselen) |
513 | goto invalid_datalen; | |
514 | ||
515 | memcpy(sc->sense_buffer, data + 2, | |
9b80cb4b | 516 | min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE)); |
7996a778 | 517 | debug_scsi("copied %d bytes of sense\n", |
8eb00539 | 518 | min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE)); |
7996a778 MC |
519 | } |
520 | ||
c07d4444 BH |
521 | if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW | |
522 | ISCSI_FLAG_CMD_BIDI_OVERFLOW)) { | |
523 | int res_count = be32_to_cpu(rhdr->bi_residual_count); | |
524 | ||
525 | if (scsi_bidi_cmnd(sc) && res_count > 0 && | |
526 | (rhdr->flags & ISCSI_FLAG_CMD_BIDI_OVERFLOW || | |
527 | res_count <= scsi_in(sc)->length)) | |
528 | scsi_in(sc)->resid = res_count; | |
529 | else | |
530 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
531 | } | |
532 | ||
7207fea4 BH |
533 | if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW | |
534 | ISCSI_FLAG_CMD_OVERFLOW)) { | |
7996a778 MC |
535 | int res_count = be32_to_cpu(rhdr->residual_count); |
536 | ||
7207fea4 BH |
537 | if (res_count > 0 && |
538 | (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || | |
539 | res_count <= scsi_bufflen(sc))) | |
c07d4444 | 540 | /* write side for bidi or uni-io set_resid */ |
1c138991 | 541 | scsi_set_resid(sc, res_count); |
7996a778 MC |
542 | else |
543 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
c07d4444 | 544 | } |
7996a778 MC |
545 | out: |
546 | debug_scsi("done [sc %lx res %d itt 0x%x]\n", | |
547 | (long)sc, sc->result, ctask->itt); | |
548 | conn->scsirsp_pdus_cnt++; | |
549 | ||
60ecebf5 | 550 | __iscsi_put_ctask(ctask); |
7996a778 MC |
551 | } |
552 | ||
7ea8b828 MC |
553 | static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr) |
554 | { | |
555 | struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr; | |
556 | ||
557 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
558 | conn->tmfrsp_pdus_cnt++; | |
559 | ||
843c0a8a | 560 | if (conn->tmf_state != TMF_QUEUED) |
7ea8b828 MC |
561 | return; |
562 | ||
563 | if (tmf->response == ISCSI_TMF_RSP_COMPLETE) | |
843c0a8a | 564 | conn->tmf_state = TMF_SUCCESS; |
7ea8b828 | 565 | else if (tmf->response == ISCSI_TMF_RSP_NO_TASK) |
843c0a8a | 566 | conn->tmf_state = TMF_NOT_FOUND; |
7ea8b828 | 567 | else |
843c0a8a | 568 | conn->tmf_state = TMF_FAILED; |
7ea8b828 MC |
569 | wake_up(&conn->ehwait); |
570 | } | |
571 | ||
f6d5180c MC |
572 | static void iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr) |
573 | { | |
574 | struct iscsi_nopout hdr; | |
575 | struct iscsi_mgmt_task *mtask; | |
576 | ||
577 | if (!rhdr && conn->ping_mtask) | |
578 | return; | |
579 | ||
580 | memset(&hdr, 0, sizeof(struct iscsi_nopout)); | |
581 | hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE; | |
582 | hdr.flags = ISCSI_FLAG_CMD_FINAL; | |
583 | ||
584 | if (rhdr) { | |
585 | memcpy(hdr.lun, rhdr->lun, 8); | |
586 | hdr.ttt = rhdr->ttt; | |
587 | hdr.itt = RESERVED_ITT; | |
588 | } else | |
589 | hdr.ttt = RESERVED_ITT; | |
590 | ||
591 | mtask = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0); | |
592 | if (!mtask) { | |
322d739d | 593 | iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n"); |
f6d5180c MC |
594 | return; |
595 | } | |
596 | ||
597 | /* only track our nops */ | |
598 | if (!rhdr) { | |
599 | conn->ping_mtask = mtask; | |
600 | conn->last_ping = jiffies; | |
601 | } | |
602 | scsi_queue_work(conn->session->host, &conn->xmitwork); | |
603 | } | |
604 | ||
62f38300 MC |
605 | static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
606 | char *data, int datalen) | |
607 | { | |
608 | struct iscsi_reject *reject = (struct iscsi_reject *)hdr; | |
609 | struct iscsi_hdr rejected_pdu; | |
610 | uint32_t itt; | |
611 | ||
612 | conn->exp_statsn = be32_to_cpu(reject->statsn) + 1; | |
613 | ||
614 | if (reject->reason == ISCSI_REASON_DATA_DIGEST_ERROR) { | |
615 | if (ntoh24(reject->dlength) > datalen) | |
616 | return ISCSI_ERR_PROTO; | |
617 | ||
618 | if (ntoh24(reject->dlength) >= sizeof(struct iscsi_hdr)) { | |
619 | memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr)); | |
b4377356 | 620 | itt = get_itt(rejected_pdu.itt); |
322d739d MC |
621 | iscsi_conn_printk(KERN_ERR, conn, |
622 | "itt 0x%x had pdu (op 0x%x) rejected " | |
623 | "due to DataDigest error.\n", itt, | |
624 | rejected_pdu.opcode); | |
62f38300 MC |
625 | } |
626 | } | |
627 | return 0; | |
628 | } | |
629 | ||
7996a778 MC |
630 | /** |
631 | * __iscsi_complete_pdu - complete pdu | |
632 | * @conn: iscsi conn | |
633 | * @hdr: iscsi header | |
634 | * @data: data buffer | |
635 | * @datalen: len of data buffer | |
636 | * | |
637 | * Completes pdu processing by freeing any resources allocated at | |
638 | * queuecommand or send generic. session lock must be held and verify | |
639 | * itt must have been called. | |
640 | */ | |
f8d9d654 AB |
641 | static int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
642 | char *data, int datalen) | |
7996a778 MC |
643 | { |
644 | struct iscsi_session *session = conn->session; | |
645 | int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0; | |
646 | struct iscsi_cmd_task *ctask; | |
647 | struct iscsi_mgmt_task *mtask; | |
648 | uint32_t itt; | |
649 | ||
f6d5180c | 650 | conn->last_recv = jiffies; |
b4377356 AV |
651 | if (hdr->itt != RESERVED_ITT) |
652 | itt = get_itt(hdr->itt); | |
7996a778 | 653 | else |
b4377356 | 654 | itt = ~0U; |
7996a778 MC |
655 | |
656 | if (itt < session->cmds_max) { | |
657 | ctask = session->cmds[itt]; | |
658 | ||
659 | debug_scsi("cmdrsp [op 0x%x cid %d itt 0x%x len %d]\n", | |
660 | opcode, conn->id, ctask->itt, datalen); | |
661 | ||
662 | switch(opcode) { | |
663 | case ISCSI_OP_SCSI_CMD_RSP: | |
664 | BUG_ON((void*)ctask != ctask->sc->SCp.ptr); | |
77a23c21 MC |
665 | iscsi_scsi_cmd_rsp(conn, hdr, ctask, data, |
666 | datalen); | |
7996a778 MC |
667 | break; |
668 | case ISCSI_OP_SCSI_DATA_IN: | |
669 | BUG_ON((void*)ctask != ctask->sc->SCp.ptr); | |
670 | if (hdr->flags & ISCSI_FLAG_DATA_STATUS) { | |
671 | conn->scsirsp_pdus_cnt++; | |
60ecebf5 | 672 | __iscsi_put_ctask(ctask); |
7996a778 MC |
673 | } |
674 | break; | |
675 | case ISCSI_OP_R2T: | |
676 | /* LLD handles this for now */ | |
677 | break; | |
678 | default: | |
679 | rc = ISCSI_ERR_BAD_OPCODE; | |
680 | break; | |
681 | } | |
682 | } else if (itt >= ISCSI_MGMT_ITT_OFFSET && | |
683 | itt < ISCSI_MGMT_ITT_OFFSET + session->mgmtpool_max) { | |
684 | mtask = session->mgmt_cmds[itt - ISCSI_MGMT_ITT_OFFSET]; | |
685 | ||
686 | debug_scsi("immrsp [op 0x%x cid %d itt 0x%x len %d]\n", | |
687 | opcode, conn->id, mtask->itt, datalen); | |
688 | ||
77a23c21 | 689 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); |
7996a778 | 690 | switch(opcode) { |
8d2860b3 | 691 | case ISCSI_OP_LOGOUT_RSP: |
c8dc1e52 MC |
692 | if (datalen) { |
693 | rc = ISCSI_ERR_PROTO; | |
694 | break; | |
695 | } | |
8d2860b3 MC |
696 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; |
697 | /* fall through */ | |
7996a778 MC |
698 | case ISCSI_OP_LOGIN_RSP: |
699 | case ISCSI_OP_TEXT_RSP: | |
8d2860b3 MC |
700 | /* |
701 | * login related PDU's exp_statsn is handled in | |
702 | * userspace | |
703 | */ | |
40527afe MC |
704 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) |
705 | rc = ISCSI_ERR_CONN_FAILED; | |
b3a7ea8d | 706 | iscsi_free_mgmt_task(conn, mtask); |
7996a778 MC |
707 | break; |
708 | case ISCSI_OP_SCSI_TMFUNC_RSP: | |
7996a778 MC |
709 | if (datalen) { |
710 | rc = ISCSI_ERR_PROTO; | |
711 | break; | |
712 | } | |
8d2860b3 | 713 | |
7ea8b828 | 714 | iscsi_tmf_rsp(conn, hdr); |
b3a7ea8d | 715 | iscsi_free_mgmt_task(conn, mtask); |
7996a778 MC |
716 | break; |
717 | case ISCSI_OP_NOOP_IN: | |
f6d5180c MC |
718 | if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || |
719 | datalen) { | |
7996a778 MC |
720 | rc = ISCSI_ERR_PROTO; |
721 | break; | |
722 | } | |
7996a778 MC |
723 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; |
724 | ||
f6d5180c MC |
725 | if (conn->ping_mtask != mtask) { |
726 | /* | |
727 | * If this is not in response to one of our | |
728 | * nops then it must be from userspace. | |
729 | */ | |
730 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, | |
731 | datalen)) | |
732 | rc = ISCSI_ERR_CONN_FAILED; | |
c8611f97 MC |
733 | } else |
734 | mod_timer(&conn->transport_timer, | |
735 | jiffies + conn->recv_timeout); | |
b3a7ea8d | 736 | iscsi_free_mgmt_task(conn, mtask); |
7996a778 MC |
737 | break; |
738 | default: | |
739 | rc = ISCSI_ERR_BAD_OPCODE; | |
740 | break; | |
741 | } | |
b4377356 | 742 | } else if (itt == ~0U) { |
77a23c21 | 743 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); |
62f38300 | 744 | |
7996a778 MC |
745 | switch(opcode) { |
746 | case ISCSI_OP_NOOP_IN: | |
40527afe | 747 | if (datalen) { |
7996a778 | 748 | rc = ISCSI_ERR_PROTO; |
40527afe MC |
749 | break; |
750 | } | |
751 | ||
b4377356 | 752 | if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG)) |
40527afe MC |
753 | break; |
754 | ||
f6d5180c | 755 | iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr); |
7996a778 MC |
756 | break; |
757 | case ISCSI_OP_REJECT: | |
62f38300 MC |
758 | rc = iscsi_handle_reject(conn, hdr, data, datalen); |
759 | break; | |
7996a778 | 760 | case ISCSI_OP_ASYNC_EVENT: |
8d2860b3 | 761 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; |
5831c737 MC |
762 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) |
763 | rc = ISCSI_ERR_CONN_FAILED; | |
7996a778 MC |
764 | break; |
765 | default: | |
766 | rc = ISCSI_ERR_BAD_OPCODE; | |
767 | break; | |
768 | } | |
769 | } else | |
770 | rc = ISCSI_ERR_BAD_ITT; | |
771 | ||
772 | return rc; | |
773 | } | |
7996a778 MC |
774 | |
775 | int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
776 | char *data, int datalen) | |
777 | { | |
778 | int rc; | |
779 | ||
780 | spin_lock(&conn->session->lock); | |
781 | rc = __iscsi_complete_pdu(conn, hdr, data, datalen); | |
782 | spin_unlock(&conn->session->lock); | |
783 | return rc; | |
784 | } | |
785 | EXPORT_SYMBOL_GPL(iscsi_complete_pdu); | |
786 | ||
787 | /* verify itt (itt encoding: age+cid+itt) */ | |
788 | int iscsi_verify_itt(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
789 | uint32_t *ret_itt) | |
790 | { | |
791 | struct iscsi_session *session = conn->session; | |
792 | struct iscsi_cmd_task *ctask; | |
793 | uint32_t itt; | |
794 | ||
b4377356 AV |
795 | if (hdr->itt != RESERVED_ITT) { |
796 | if (((__force u32)hdr->itt & ISCSI_AGE_MASK) != | |
7996a778 | 797 | (session->age << ISCSI_AGE_SHIFT)) { |
322d739d MC |
798 | iscsi_conn_printk(KERN_ERR, conn, |
799 | "received itt %x expected session " | |
800 | "age (%x)\n", (__force u32)hdr->itt, | |
801 | session->age & ISCSI_AGE_MASK); | |
7996a778 MC |
802 | return ISCSI_ERR_BAD_ITT; |
803 | } | |
804 | ||
b4377356 | 805 | itt = get_itt(hdr->itt); |
7996a778 | 806 | } else |
b4377356 | 807 | itt = ~0U; |
7996a778 MC |
808 | |
809 | if (itt < session->cmds_max) { | |
810 | ctask = session->cmds[itt]; | |
811 | ||
812 | if (!ctask->sc) { | |
322d739d MC |
813 | iscsi_conn_printk(KERN_INFO, conn, "dropping ctask " |
814 | "with itt 0x%x\n", ctask->itt); | |
7996a778 MC |
815 | /* force drop */ |
816 | return ISCSI_ERR_NO_SCSI_CMD; | |
817 | } | |
818 | ||
819 | if (ctask->sc->SCp.phase != session->age) { | |
322d739d MC |
820 | iscsi_conn_printk(KERN_ERR, conn, |
821 | "iscsi: ctask's session age %d, " | |
822 | "expected %d\n", ctask->sc->SCp.phase, | |
823 | session->age); | |
7996a778 MC |
824 | return ISCSI_ERR_SESSION_FAILED; |
825 | } | |
826 | } | |
827 | ||
828 | *ret_itt = itt; | |
829 | return 0; | |
830 | } | |
831 | EXPORT_SYMBOL_GPL(iscsi_verify_itt); | |
832 | ||
833 | void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err) | |
834 | { | |
835 | struct iscsi_session *session = conn->session; | |
836 | unsigned long flags; | |
837 | ||
838 | spin_lock_irqsave(&session->lock, flags); | |
656cffc9 MC |
839 | if (session->state == ISCSI_STATE_FAILED) { |
840 | spin_unlock_irqrestore(&session->lock, flags); | |
841 | return; | |
842 | } | |
843 | ||
67a61114 | 844 | if (conn->stop_stage == 0) |
7996a778 MC |
845 | session->state = ISCSI_STATE_FAILED; |
846 | spin_unlock_irqrestore(&session->lock, flags); | |
847 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
848 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
849 | iscsi_conn_error(conn->cls_conn, err); | |
850 | } | |
851 | EXPORT_SYMBOL_GPL(iscsi_conn_failure); | |
852 | ||
77a23c21 MC |
853 | static void iscsi_prep_mtask(struct iscsi_conn *conn, |
854 | struct iscsi_mgmt_task *mtask) | |
855 | { | |
856 | struct iscsi_session *session = conn->session; | |
857 | struct iscsi_hdr *hdr = mtask->hdr; | |
858 | struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr; | |
859 | ||
860 | if (hdr->opcode != (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) && | |
861 | hdr->opcode != (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE)) | |
862 | nop->exp_statsn = cpu_to_be32(conn->exp_statsn); | |
863 | /* | |
864 | * pre-format CmdSN for outgoing PDU. | |
865 | */ | |
866 | nop->cmdsn = cpu_to_be32(session->cmdsn); | |
867 | if (hdr->itt != RESERVED_ITT) { | |
8b1d0343 | 868 | hdr->itt = build_itt(mtask->itt, session->age); |
e0726407 MC |
869 | /* |
870 | * TODO: We always use immediate, so we never hit this. | |
871 | * If we start to send tmfs or nops as non-immediate then | |
872 | * we should start checking the cmdsn numbers for mgmt tasks. | |
873 | */ | |
77a23c21 | 874 | if (conn->c_stage == ISCSI_CONN_STARTED && |
e0726407 MC |
875 | !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { |
876 | session->queued_cmdsn++; | |
77a23c21 | 877 | session->cmdsn++; |
e0726407 | 878 | } |
77a23c21 MC |
879 | } |
880 | ||
881 | if (session->tt->init_mgmt_task) | |
882 | session->tt->init_mgmt_task(conn, mtask); | |
883 | ||
884 | debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n", | |
843c0a8a MC |
885 | hdr->opcode & ISCSI_OPCODE_MASK, hdr->itt, |
886 | mtask->data_count); | |
77a23c21 MC |
887 | } |
888 | ||
05db888a | 889 | static int iscsi_xmit_mtask(struct iscsi_conn *conn) |
b5072ea0 MC |
890 | { |
891 | struct iscsi_hdr *hdr = conn->mtask->hdr; | |
b3a7ea8d | 892 | int rc; |
b5072ea0 | 893 | |
b3a7ea8d MC |
894 | if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT) |
895 | conn->session->state = ISCSI_STATE_LOGGING_OUT; | |
77a23c21 | 896 | spin_unlock_bh(&conn->session->lock); |
b3a7ea8d | 897 | |
b5072ea0 | 898 | rc = conn->session->tt->xmit_mgmt_task(conn, conn->mtask); |
77a23c21 | 899 | spin_lock_bh(&conn->session->lock); |
b5072ea0 MC |
900 | if (rc) |
901 | return rc; | |
902 | ||
05db888a MC |
903 | /* done with this in-progress mtask */ |
904 | conn->mtask = NULL; | |
b5072ea0 MC |
905 | return 0; |
906 | } | |
907 | ||
77a23c21 MC |
908 | static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn) |
909 | { | |
910 | struct iscsi_session *session = conn->session; | |
911 | ||
912 | /* | |
913 | * Check for iSCSI window and take care of CmdSN wrap-around | |
914 | */ | |
e0726407 MC |
915 | if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) { |
916 | debug_scsi("iSCSI CmdSN closed. ExpCmdSn %u MaxCmdSN %u " | |
917 | "CmdSN %u/%u\n", session->exp_cmdsn, | |
918 | session->max_cmdsn, session->cmdsn, | |
919 | session->queued_cmdsn); | |
77a23c21 MC |
920 | return -ENOSPC; |
921 | } | |
922 | return 0; | |
923 | } | |
924 | ||
925 | static int iscsi_xmit_ctask(struct iscsi_conn *conn) | |
926 | { | |
927 | struct iscsi_cmd_task *ctask = conn->ctask; | |
843c0a8a | 928 | int rc; |
77a23c21 MC |
929 | |
930 | __iscsi_get_ctask(ctask); | |
931 | spin_unlock_bh(&conn->session->lock); | |
932 | rc = conn->session->tt->xmit_cmd_task(conn, ctask); | |
933 | spin_lock_bh(&conn->session->lock); | |
934 | __iscsi_put_ctask(ctask); | |
77a23c21 MC |
935 | if (!rc) |
936 | /* done with this ctask */ | |
937 | conn->ctask = NULL; | |
938 | return rc; | |
939 | } | |
940 | ||
843c0a8a MC |
941 | /** |
942 | * iscsi_requeue_ctask - requeue ctask to run from session workqueue | |
943 | * @ctask: ctask to requeue | |
944 | * | |
945 | * LLDs that need to run a ctask from the session workqueue should call | |
946 | * this. The session lock must be held. | |
947 | */ | |
948 | void iscsi_requeue_ctask(struct iscsi_cmd_task *ctask) | |
949 | { | |
950 | struct iscsi_conn *conn = ctask->conn; | |
951 | ||
952 | list_move_tail(&ctask->running, &conn->requeue); | |
953 | scsi_queue_work(conn->session->host, &conn->xmitwork); | |
954 | } | |
955 | EXPORT_SYMBOL_GPL(iscsi_requeue_ctask); | |
956 | ||
7996a778 MC |
957 | /** |
958 | * iscsi_data_xmit - xmit any command into the scheduled connection | |
959 | * @conn: iscsi connection | |
960 | * | |
961 | * Notes: | |
962 | * The function can return -EAGAIN in which case the caller must | |
963 | * re-schedule it again later or recover. '0' return code means | |
964 | * successful xmit. | |
965 | **/ | |
966 | static int iscsi_data_xmit(struct iscsi_conn *conn) | |
967 | { | |
3219e529 | 968 | int rc = 0; |
7996a778 | 969 | |
77a23c21 | 970 | spin_lock_bh(&conn->session->lock); |
7996a778 MC |
971 | if (unlikely(conn->suspend_tx)) { |
972 | debug_scsi("conn %d Tx suspended!\n", conn->id); | |
77a23c21 | 973 | spin_unlock_bh(&conn->session->lock); |
3219e529 | 974 | return -ENODATA; |
7996a778 | 975 | } |
7996a778 MC |
976 | |
977 | if (conn->ctask) { | |
77a23c21 | 978 | rc = iscsi_xmit_ctask(conn); |
3219e529 | 979 | if (rc) |
7996a778 | 980 | goto again; |
7996a778 | 981 | } |
77a23c21 | 982 | |
7996a778 | 983 | if (conn->mtask) { |
05db888a | 984 | rc = iscsi_xmit_mtask(conn); |
3219e529 | 985 | if (rc) |
7996a778 | 986 | goto again; |
7996a778 MC |
987 | } |
988 | ||
77a23c21 MC |
989 | /* |
990 | * process mgmt pdus like nops before commands since we should | |
991 | * only have one nop-out as a ping from us and targets should not | |
992 | * overflow us with nop-ins | |
993 | */ | |
994 | check_mgmt: | |
843c0a8a MC |
995 | while (!list_empty(&conn->mgmtqueue)) { |
996 | conn->mtask = list_entry(conn->mgmtqueue.next, | |
997 | struct iscsi_mgmt_task, running); | |
b3a7ea8d MC |
998 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) { |
999 | iscsi_free_mgmt_task(conn, conn->mtask); | |
1000 | conn->mtask = NULL; | |
1001 | continue; | |
1002 | } | |
1003 | ||
77a23c21 | 1004 | iscsi_prep_mtask(conn, conn->mtask); |
843c0a8a | 1005 | list_move_tail(conn->mgmtqueue.next, &conn->mgmt_run_list); |
77a23c21 MC |
1006 | rc = iscsi_xmit_mtask(conn); |
1007 | if (rc) | |
1008 | goto again; | |
7996a778 MC |
1009 | } |
1010 | ||
843c0a8a | 1011 | /* process pending command queue */ |
b6c395ed | 1012 | while (!list_empty(&conn->xmitqueue)) { |
843c0a8a MC |
1013 | if (conn->tmf_state == TMF_QUEUED) |
1014 | break; | |
1015 | ||
b6c395ed MC |
1016 | conn->ctask = list_entry(conn->xmitqueue.next, |
1017 | struct iscsi_cmd_task, running); | |
b3a7ea8d | 1018 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) { |
9000bcd6 | 1019 | fail_command(conn, conn->ctask, DID_IMM_RETRY << 16); |
b3a7ea8d MC |
1020 | continue; |
1021 | } | |
004d6530 BH |
1022 | if (iscsi_prep_scsi_cmd_pdu(conn->ctask)) { |
1023 | fail_command(conn, conn->ctask, DID_ABORT << 16); | |
1024 | continue; | |
1025 | } | |
a8ac6311 | 1026 | |
843c0a8a | 1027 | conn->ctask->state = ISCSI_TASK_RUNNING; |
b6c395ed | 1028 | list_move_tail(conn->xmitqueue.next, &conn->run_list); |
77a23c21 MC |
1029 | rc = iscsi_xmit_ctask(conn); |
1030 | if (rc) | |
60ecebf5 | 1031 | goto again; |
77a23c21 MC |
1032 | /* |
1033 | * we could continuously get new ctask requests so | |
1034 | * we need to check the mgmt queue for nops that need to | |
1035 | * be sent to aviod starvation | |
1036 | */ | |
843c0a8a MC |
1037 | if (!list_empty(&conn->mgmtqueue)) |
1038 | goto check_mgmt; | |
1039 | } | |
1040 | ||
1041 | while (!list_empty(&conn->requeue)) { | |
1042 | if (conn->session->fast_abort && conn->tmf_state != TMF_INITIAL) | |
1043 | break; | |
1044 | ||
b3a7ea8d MC |
1045 | /* |
1046 | * we always do fastlogout - conn stop code will clean up. | |
1047 | */ | |
1048 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) | |
1049 | break; | |
1050 | ||
843c0a8a MC |
1051 | conn->ctask = list_entry(conn->requeue.next, |
1052 | struct iscsi_cmd_task, running); | |
1053 | conn->ctask->state = ISCSI_TASK_RUNNING; | |
1054 | list_move_tail(conn->requeue.next, &conn->run_list); | |
1055 | rc = iscsi_xmit_ctask(conn); | |
1056 | if (rc) | |
1057 | goto again; | |
1058 | if (!list_empty(&conn->mgmtqueue)) | |
77a23c21 | 1059 | goto check_mgmt; |
7996a778 | 1060 | } |
b6c395ed | 1061 | spin_unlock_bh(&conn->session->lock); |
3219e529 | 1062 | return -ENODATA; |
7996a778 MC |
1063 | |
1064 | again: | |
1065 | if (unlikely(conn->suspend_tx)) | |
77a23c21 MC |
1066 | rc = -ENODATA; |
1067 | spin_unlock_bh(&conn->session->lock); | |
3219e529 | 1068 | return rc; |
7996a778 MC |
1069 | } |
1070 | ||
c4028958 | 1071 | static void iscsi_xmitworker(struct work_struct *work) |
7996a778 | 1072 | { |
c4028958 DH |
1073 | struct iscsi_conn *conn = |
1074 | container_of(work, struct iscsi_conn, xmitwork); | |
3219e529 | 1075 | int rc; |
7996a778 MC |
1076 | /* |
1077 | * serialize Xmit worker on a per-connection basis. | |
1078 | */ | |
3219e529 MC |
1079 | do { |
1080 | rc = iscsi_data_xmit(conn); | |
1081 | } while (rc >= 0 || rc == -EAGAIN); | |
7996a778 MC |
1082 | } |
1083 | ||
1084 | enum { | |
1085 | FAILURE_BAD_HOST = 1, | |
1086 | FAILURE_SESSION_FAILED, | |
1087 | FAILURE_SESSION_FREED, | |
1088 | FAILURE_WINDOW_CLOSED, | |
60ecebf5 | 1089 | FAILURE_OOM, |
7996a778 | 1090 | FAILURE_SESSION_TERMINATE, |
656cffc9 | 1091 | FAILURE_SESSION_IN_RECOVERY, |
7996a778 | 1092 | FAILURE_SESSION_RECOVERY_TIMEOUT, |
b3a7ea8d | 1093 | FAILURE_SESSION_LOGGING_OUT, |
6eabafbe | 1094 | FAILURE_SESSION_NOT_READY, |
7996a778 MC |
1095 | }; |
1096 | ||
1097 | int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *)) | |
1098 | { | |
1099 | struct Scsi_Host *host; | |
1100 | int reason = 0; | |
1101 | struct iscsi_session *session; | |
1102 | struct iscsi_conn *conn; | |
1103 | struct iscsi_cmd_task *ctask = NULL; | |
1104 | ||
1105 | sc->scsi_done = done; | |
1106 | sc->result = 0; | |
f47f2cf5 | 1107 | sc->SCp.ptr = NULL; |
7996a778 MC |
1108 | |
1109 | host = sc->device->host; | |
1040c99d | 1110 | spin_unlock(host->host_lock); |
7996a778 | 1111 | |
1040c99d | 1112 | session = iscsi_hostdata(host->hostdata); |
7996a778 MC |
1113 | spin_lock(&session->lock); |
1114 | ||
6eabafbe MC |
1115 | reason = iscsi_session_chkready(session_to_cls(session)); |
1116 | if (reason) { | |
1117 | sc->result = reason; | |
1118 | goto fault; | |
1119 | } | |
1120 | ||
656cffc9 MC |
1121 | /* |
1122 | * ISCSI_STATE_FAILED is a temp. state. The recovery | |
1123 | * code will decide what is best to do with command queued | |
1124 | * during this time | |
1125 | */ | |
1126 | if (session->state != ISCSI_STATE_LOGGED_IN && | |
1127 | session->state != ISCSI_STATE_FAILED) { | |
1128 | /* | |
1129 | * to handle the race between when we set the recovery state | |
1130 | * and block the session we requeue here (commands could | |
1131 | * be entering our queuecommand while a block is starting | |
1132 | * up because the block code is not locked) | |
1133 | */ | |
9000bcd6 MC |
1134 | switch (session->state) { |
1135 | case ISCSI_STATE_IN_RECOVERY: | |
656cffc9 | 1136 | reason = FAILURE_SESSION_IN_RECOVERY; |
6eabafbe MC |
1137 | sc->result = DID_IMM_RETRY << 16; |
1138 | break; | |
9000bcd6 MC |
1139 | case ISCSI_STATE_LOGGING_OUT: |
1140 | reason = FAILURE_SESSION_LOGGING_OUT; | |
6eabafbe MC |
1141 | sc->result = DID_IMM_RETRY << 16; |
1142 | break; | |
b3a7ea8d | 1143 | case ISCSI_STATE_RECOVERY_FAILED: |
656cffc9 | 1144 | reason = FAILURE_SESSION_RECOVERY_TIMEOUT; |
6eabafbe | 1145 | sc->result = DID_NO_CONNECT << 16; |
b3a7ea8d MC |
1146 | break; |
1147 | case ISCSI_STATE_TERMINATE: | |
656cffc9 | 1148 | reason = FAILURE_SESSION_TERMINATE; |
6eabafbe | 1149 | sc->result = DID_NO_CONNECT << 16; |
b3a7ea8d | 1150 | break; |
b3a7ea8d | 1151 | default: |
656cffc9 | 1152 | reason = FAILURE_SESSION_FREED; |
6eabafbe | 1153 | sc->result = DID_NO_CONNECT << 16; |
b3a7ea8d | 1154 | } |
7996a778 MC |
1155 | goto fault; |
1156 | } | |
1157 | ||
7996a778 | 1158 | conn = session->leadconn; |
98644047 MC |
1159 | if (!conn) { |
1160 | reason = FAILURE_SESSION_FREED; | |
6eabafbe | 1161 | sc->result = DID_NO_CONNECT << 16; |
98644047 MC |
1162 | goto fault; |
1163 | } | |
7996a778 | 1164 | |
77a23c21 MC |
1165 | if (iscsi_check_cmdsn_window_closed(conn)) { |
1166 | reason = FAILURE_WINDOW_CLOSED; | |
1167 | goto reject; | |
1168 | } | |
1169 | ||
60ecebf5 MC |
1170 | if (!__kfifo_get(session->cmdpool.queue, (void*)&ctask, |
1171 | sizeof(void*))) { | |
1172 | reason = FAILURE_OOM; | |
1173 | goto reject; | |
1174 | } | |
e0726407 MC |
1175 | session->queued_cmdsn++; |
1176 | ||
7996a778 MC |
1177 | sc->SCp.phase = session->age; |
1178 | sc->SCp.ptr = (char *)ctask; | |
1179 | ||
60ecebf5 | 1180 | atomic_set(&ctask->refcount, 1); |
b6c395ed | 1181 | ctask->state = ISCSI_TASK_PENDING; |
7996a778 MC |
1182 | ctask->conn = conn; |
1183 | ctask->sc = sc; | |
1184 | INIT_LIST_HEAD(&ctask->running); | |
7996a778 | 1185 | |
b6c395ed | 1186 | list_add_tail(&ctask->running, &conn->xmitqueue); |
7996a778 MC |
1187 | spin_unlock(&session->lock); |
1188 | ||
1189 | scsi_queue_work(host, &conn->xmitwork); | |
1040c99d | 1190 | spin_lock(host->host_lock); |
7996a778 MC |
1191 | return 0; |
1192 | ||
1193 | reject: | |
1194 | spin_unlock(&session->lock); | |
1195 | debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason); | |
1040c99d | 1196 | spin_lock(host->host_lock); |
7996a778 MC |
1197 | return SCSI_MLQUEUE_HOST_BUSY; |
1198 | ||
1199 | fault: | |
1200 | spin_unlock(&session->lock); | |
6eabafbe | 1201 | debug_scsi("iscsi: cmd 0x%x is not queued (%d)\n", sc->cmnd[0], reason); |
c07d4444 BH |
1202 | if (!scsi_bidi_cmnd(sc)) |
1203 | scsi_set_resid(sc, scsi_bufflen(sc)); | |
1204 | else { | |
1205 | scsi_out(sc)->resid = scsi_out(sc)->length; | |
1206 | scsi_in(sc)->resid = scsi_in(sc)->length; | |
1207 | } | |
7996a778 | 1208 | sc->scsi_done(sc); |
1040c99d | 1209 | spin_lock(host->host_lock); |
7996a778 MC |
1210 | return 0; |
1211 | } | |
1212 | EXPORT_SYMBOL_GPL(iscsi_queuecommand); | |
1213 | ||
1214 | int iscsi_change_queue_depth(struct scsi_device *sdev, int depth) | |
1215 | { | |
1216 | if (depth > ISCSI_MAX_CMD_PER_LUN) | |
1217 | depth = ISCSI_MAX_CMD_PER_LUN; | |
1218 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); | |
1219 | return sdev->queue_depth; | |
1220 | } | |
1221 | EXPORT_SYMBOL_GPL(iscsi_change_queue_depth); | |
1222 | ||
7996a778 MC |
1223 | void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session) |
1224 | { | |
1225 | struct iscsi_session *session = class_to_transport_session(cls_session); | |
7996a778 MC |
1226 | |
1227 | spin_lock_bh(&session->lock); | |
1228 | if (session->state != ISCSI_STATE_LOGGED_IN) { | |
656cffc9 | 1229 | session->state = ISCSI_STATE_RECOVERY_FAILED; |
843c0a8a MC |
1230 | if (session->leadconn) |
1231 | wake_up(&session->leadconn->ehwait); | |
7996a778 MC |
1232 | } |
1233 | spin_unlock_bh(&session->lock); | |
1234 | } | |
1235 | EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout); | |
1236 | ||
1237 | int iscsi_eh_host_reset(struct scsi_cmnd *sc) | |
1238 | { | |
1239 | struct Scsi_Host *host = sc->device->host; | |
1240 | struct iscsi_session *session = iscsi_hostdata(host->hostdata); | |
1241 | struct iscsi_conn *conn = session->leadconn; | |
7996a778 | 1242 | |
bc436b27 | 1243 | mutex_lock(&session->eh_mutex); |
7996a778 MC |
1244 | spin_lock_bh(&session->lock); |
1245 | if (session->state == ISCSI_STATE_TERMINATE) { | |
1246 | failed: | |
1247 | debug_scsi("failing host reset: session terminated " | |
d6e24d1c | 1248 | "[CID %d age %d]\n", conn->id, session->age); |
7996a778 | 1249 | spin_unlock_bh(&session->lock); |
bc436b27 | 1250 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1251 | return FAILED; |
1252 | } | |
1253 | ||
7996a778 | 1254 | spin_unlock_bh(&session->lock); |
bc436b27 | 1255 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1256 | /* |
1257 | * we drop the lock here but the leadconn cannot be destoyed while | |
1258 | * we are in the scsi eh | |
1259 | */ | |
843c0a8a | 1260 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
7996a778 MC |
1261 | |
1262 | debug_scsi("iscsi_eh_host_reset wait for relogin\n"); | |
1263 | wait_event_interruptible(conn->ehwait, | |
1264 | session->state == ISCSI_STATE_TERMINATE || | |
1265 | session->state == ISCSI_STATE_LOGGED_IN || | |
656cffc9 | 1266 | session->state == ISCSI_STATE_RECOVERY_FAILED); |
7996a778 MC |
1267 | if (signal_pending(current)) |
1268 | flush_signals(current); | |
1269 | ||
bc436b27 | 1270 | mutex_lock(&session->eh_mutex); |
7996a778 MC |
1271 | spin_lock_bh(&session->lock); |
1272 | if (session->state == ISCSI_STATE_LOGGED_IN) | |
322d739d MC |
1273 | iscsi_session_printk(KERN_INFO, session, |
1274 | "host reset succeeded\n"); | |
7996a778 MC |
1275 | else |
1276 | goto failed; | |
1277 | spin_unlock_bh(&session->lock); | |
bc436b27 | 1278 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1279 | return SUCCESS; |
1280 | } | |
1281 | EXPORT_SYMBOL_GPL(iscsi_eh_host_reset); | |
1282 | ||
843c0a8a | 1283 | static void iscsi_tmf_timedout(unsigned long data) |
7996a778 | 1284 | { |
843c0a8a | 1285 | struct iscsi_conn *conn = (struct iscsi_conn *)data; |
7996a778 MC |
1286 | struct iscsi_session *session = conn->session; |
1287 | ||
1288 | spin_lock(&session->lock); | |
843c0a8a MC |
1289 | if (conn->tmf_state == TMF_QUEUED) { |
1290 | conn->tmf_state = TMF_TIMEDOUT; | |
1291 | debug_scsi("tmf timedout\n"); | |
7996a778 MC |
1292 | /* unblock eh_abort() */ |
1293 | wake_up(&conn->ehwait); | |
1294 | } | |
1295 | spin_unlock(&session->lock); | |
1296 | } | |
1297 | ||
843c0a8a | 1298 | static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn, |
f6d5180c MC |
1299 | struct iscsi_tm *hdr, int age, |
1300 | int timeout) | |
7996a778 | 1301 | { |
7996a778 | 1302 | struct iscsi_session *session = conn->session; |
843c0a8a | 1303 | struct iscsi_mgmt_task *mtask; |
7996a778 | 1304 | |
843c0a8a MC |
1305 | mtask = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr, |
1306 | NULL, 0); | |
1307 | if (!mtask) { | |
6724add1 | 1308 | spin_unlock_bh(&session->lock); |
7996a778 | 1309 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
843c0a8a MC |
1310 | spin_lock_bh(&session->lock); |
1311 | debug_scsi("tmf exec failure\n"); | |
77a23c21 | 1312 | return -EPERM; |
7996a778 | 1313 | } |
843c0a8a | 1314 | conn->tmfcmd_pdus_cnt++; |
f6d5180c | 1315 | conn->tmf_timer.expires = timeout * HZ + jiffies; |
843c0a8a MC |
1316 | conn->tmf_timer.function = iscsi_tmf_timedout; |
1317 | conn->tmf_timer.data = (unsigned long)conn; | |
1318 | add_timer(&conn->tmf_timer); | |
1319 | debug_scsi("tmf set timeout\n"); | |
7996a778 | 1320 | |
7996a778 | 1321 | spin_unlock_bh(&session->lock); |
6724add1 | 1322 | mutex_unlock(&session->eh_mutex); |
77a23c21 | 1323 | scsi_queue_work(session->host, &conn->xmitwork); |
7996a778 MC |
1324 | |
1325 | /* | |
1326 | * block eh thread until: | |
1327 | * | |
843c0a8a MC |
1328 | * 1) tmf response |
1329 | * 2) tmf timeout | |
7996a778 MC |
1330 | * 3) session is terminated or restarted or userspace has |
1331 | * given up on recovery | |
1332 | */ | |
843c0a8a | 1333 | wait_event_interruptible(conn->ehwait, age != session->age || |
7996a778 | 1334 | session->state != ISCSI_STATE_LOGGED_IN || |
843c0a8a | 1335 | conn->tmf_state != TMF_QUEUED); |
7996a778 MC |
1336 | if (signal_pending(current)) |
1337 | flush_signals(current); | |
843c0a8a MC |
1338 | del_timer_sync(&conn->tmf_timer); |
1339 | ||
6724add1 | 1340 | mutex_lock(&session->eh_mutex); |
77a23c21 | 1341 | spin_lock_bh(&session->lock); |
843c0a8a MC |
1342 | /* if the session drops it will clean up the mtask */ |
1343 | if (age != session->age || | |
1344 | session->state != ISCSI_STATE_LOGGED_IN) | |
1345 | return -ENOTCONN; | |
7996a778 MC |
1346 | return 0; |
1347 | } | |
1348 | ||
843c0a8a MC |
1349 | /* |
1350 | * Fail commands. session lock held and recv side suspended and xmit | |
1351 | * thread flushed | |
1352 | */ | |
6eabafbe MC |
1353 | static void fail_all_commands(struct iscsi_conn *conn, unsigned lun, |
1354 | int error) | |
843c0a8a MC |
1355 | { |
1356 | struct iscsi_cmd_task *ctask, *tmp; | |
1357 | ||
1358 | if (conn->ctask && (conn->ctask->sc->device->lun == lun || lun == -1)) | |
1359 | conn->ctask = NULL; | |
1360 | ||
1361 | /* flush pending */ | |
1362 | list_for_each_entry_safe(ctask, tmp, &conn->xmitqueue, running) { | |
1363 | if (lun == ctask->sc->device->lun || lun == -1) { | |
1364 | debug_scsi("failing pending sc %p itt 0x%x\n", | |
1365 | ctask->sc, ctask->itt); | |
6eabafbe | 1366 | fail_command(conn, ctask, error << 16); |
843c0a8a MC |
1367 | } |
1368 | } | |
1369 | ||
1370 | list_for_each_entry_safe(ctask, tmp, &conn->requeue, running) { | |
1371 | if (lun == ctask->sc->device->lun || lun == -1) { | |
1372 | debug_scsi("failing requeued sc %p itt 0x%x\n", | |
1373 | ctask->sc, ctask->itt); | |
6eabafbe | 1374 | fail_command(conn, ctask, error << 16); |
843c0a8a MC |
1375 | } |
1376 | } | |
1377 | ||
1378 | /* fail all other running */ | |
1379 | list_for_each_entry_safe(ctask, tmp, &conn->run_list, running) { | |
1380 | if (lun == ctask->sc->device->lun || lun == -1) { | |
1381 | debug_scsi("failing in progress sc %p itt 0x%x\n", | |
1382 | ctask->sc, ctask->itt); | |
1383 | fail_command(conn, ctask, DID_BUS_BUSY << 16); | |
1384 | } | |
1385 | } | |
1386 | } | |
1387 | ||
6724add1 MC |
1388 | static void iscsi_suspend_tx(struct iscsi_conn *conn) |
1389 | { | |
1390 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
1391 | scsi_flush_work(conn->session->host); | |
1392 | } | |
1393 | ||
1394 | static void iscsi_start_tx(struct iscsi_conn *conn) | |
1395 | { | |
1396 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
1397 | scsi_queue_work(conn->session->host, &conn->xmitwork); | |
1398 | } | |
1399 | ||
f6d5180c MC |
1400 | static enum scsi_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *scmd) |
1401 | { | |
1402 | struct iscsi_cls_session *cls_session; | |
1403 | struct iscsi_session *session; | |
1404 | struct iscsi_conn *conn; | |
1405 | enum scsi_eh_timer_return rc = EH_NOT_HANDLED; | |
1406 | ||
1407 | cls_session = starget_to_session(scsi_target(scmd->device)); | |
1408 | session = class_to_transport_session(cls_session); | |
1409 | ||
1410 | debug_scsi("scsi cmd %p timedout\n", scmd); | |
1411 | ||
1412 | spin_lock(&session->lock); | |
1413 | if (session->state != ISCSI_STATE_LOGGED_IN) { | |
1414 | /* | |
1415 | * We are probably in the middle of iscsi recovery so let | |
1416 | * that complete and handle the error. | |
1417 | */ | |
1418 | rc = EH_RESET_TIMER; | |
1419 | goto done; | |
1420 | } | |
1421 | ||
1422 | conn = session->leadconn; | |
1423 | if (!conn) { | |
1424 | /* In the middle of shuting down */ | |
1425 | rc = EH_RESET_TIMER; | |
1426 | goto done; | |
1427 | } | |
1428 | ||
1429 | if (!conn->recv_timeout && !conn->ping_timeout) | |
1430 | goto done; | |
1431 | /* | |
1432 | * if the ping timedout then we are in the middle of cleaning up | |
1433 | * and can let the iscsi eh handle it | |
1434 | */ | |
1435 | if (time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) + | |
1436 | (conn->ping_timeout * HZ), jiffies)) | |
1437 | rc = EH_RESET_TIMER; | |
1438 | /* | |
1439 | * if we are about to check the transport then give the command | |
1440 | * more time | |
1441 | */ | |
1442 | if (time_before_eq(conn->last_recv + (conn->recv_timeout * HZ), | |
1443 | jiffies)) | |
1444 | rc = EH_RESET_TIMER; | |
1445 | /* if in the middle of checking the transport then give us more time */ | |
1446 | if (conn->ping_mtask) | |
1447 | rc = EH_RESET_TIMER; | |
1448 | done: | |
1449 | spin_unlock(&session->lock); | |
1450 | debug_scsi("return %s\n", rc == EH_RESET_TIMER ? "timer reset" : "nh"); | |
1451 | return rc; | |
1452 | } | |
1453 | ||
1454 | static void iscsi_check_transport_timeouts(unsigned long data) | |
1455 | { | |
1456 | struct iscsi_conn *conn = (struct iscsi_conn *)data; | |
1457 | struct iscsi_session *session = conn->session; | |
4cf10435 | 1458 | unsigned long recv_timeout, next_timeout = 0, last_recv; |
f6d5180c MC |
1459 | |
1460 | spin_lock(&session->lock); | |
1461 | if (session->state != ISCSI_STATE_LOGGED_IN) | |
1462 | goto done; | |
1463 | ||
4cf10435 MC |
1464 | recv_timeout = conn->recv_timeout; |
1465 | if (!recv_timeout) | |
f6d5180c MC |
1466 | goto done; |
1467 | ||
4cf10435 | 1468 | recv_timeout *= HZ; |
f6d5180c | 1469 | last_recv = conn->last_recv; |
4cf10435 MC |
1470 | if (conn->ping_mtask && |
1471 | time_before_eq(conn->last_ping + (conn->ping_timeout * HZ), | |
f6d5180c | 1472 | jiffies)) { |
322d739d MC |
1473 | iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs " |
1474 | "expired, last rx %lu, last ping %lu, " | |
1475 | "now %lu\n", conn->ping_timeout, last_recv, | |
1476 | conn->last_ping, jiffies); | |
f6d5180c MC |
1477 | spin_unlock(&session->lock); |
1478 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1479 | return; | |
1480 | } | |
1481 | ||
4cf10435 | 1482 | if (time_before_eq(last_recv + recv_timeout, jiffies)) { |
c8611f97 MC |
1483 | /* send a ping to try to provoke some traffic */ |
1484 | debug_scsi("Sending nopout as ping on conn %p\n", conn); | |
1485 | iscsi_send_nopout(conn, NULL); | |
4cf10435 | 1486 | next_timeout = conn->last_ping + (conn->ping_timeout * HZ); |
ad294e9c | 1487 | } else |
4cf10435 | 1488 | next_timeout = last_recv + recv_timeout; |
f6d5180c | 1489 | |
ad294e9c MC |
1490 | debug_scsi("Setting next tmo %lu\n", next_timeout); |
1491 | mod_timer(&conn->transport_timer, next_timeout); | |
f6d5180c MC |
1492 | done: |
1493 | spin_unlock(&session->lock); | |
1494 | } | |
1495 | ||
843c0a8a MC |
1496 | static void iscsi_prep_abort_task_pdu(struct iscsi_cmd_task *ctask, |
1497 | struct iscsi_tm *hdr) | |
1498 | { | |
1499 | memset(hdr, 0, sizeof(*hdr)); | |
1500 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
1501 | hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK; | |
1502 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
1503 | memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); | |
1504 | hdr->rtt = ctask->hdr->itt; | |
1505 | hdr->refcmdsn = ctask->hdr->cmdsn; | |
1506 | } | |
1507 | ||
7996a778 MC |
1508 | int iscsi_eh_abort(struct scsi_cmnd *sc) |
1509 | { | |
6724add1 MC |
1510 | struct Scsi_Host *host = sc->device->host; |
1511 | struct iscsi_session *session = iscsi_hostdata(host->hostdata); | |
f47f2cf5 | 1512 | struct iscsi_conn *conn; |
843c0a8a MC |
1513 | struct iscsi_cmd_task *ctask; |
1514 | struct iscsi_tm *hdr; | |
1515 | int rc, age; | |
7996a778 | 1516 | |
6724add1 MC |
1517 | mutex_lock(&session->eh_mutex); |
1518 | spin_lock_bh(&session->lock); | |
f47f2cf5 MC |
1519 | /* |
1520 | * if session was ISCSI_STATE_IN_RECOVERY then we may not have | |
1521 | * got the command. | |
1522 | */ | |
1523 | if (!sc->SCp.ptr) { | |
1524 | debug_scsi("sc never reached iscsi layer or it completed.\n"); | |
6724add1 MC |
1525 | spin_unlock_bh(&session->lock); |
1526 | mutex_unlock(&session->eh_mutex); | |
f47f2cf5 MC |
1527 | return SUCCESS; |
1528 | } | |
1529 | ||
7996a778 MC |
1530 | /* |
1531 | * If we are not logged in or we have started a new session | |
1532 | * then let the host reset code handle this | |
1533 | */ | |
843c0a8a MC |
1534 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN || |
1535 | sc->SCp.phase != session->age) { | |
1536 | spin_unlock_bh(&session->lock); | |
1537 | mutex_unlock(&session->eh_mutex); | |
1538 | return FAILED; | |
1539 | } | |
1540 | ||
1541 | conn = session->leadconn; | |
1542 | conn->eh_abort_cnt++; | |
1543 | age = session->age; | |
1544 | ||
1545 | ctask = (struct iscsi_cmd_task *)sc->SCp.ptr; | |
1546 | debug_scsi("aborting [sc %p itt 0x%x]\n", sc, ctask->itt); | |
7996a778 MC |
1547 | |
1548 | /* ctask completed before time out */ | |
7ea8b828 | 1549 | if (!ctask->sc) { |
7ea8b828 | 1550 | debug_scsi("sc completed while abort in progress\n"); |
77a23c21 | 1551 | goto success; |
7ea8b828 | 1552 | } |
7996a778 | 1553 | |
77a23c21 MC |
1554 | if (ctask->state == ISCSI_TASK_PENDING) { |
1555 | fail_command(conn, ctask, DID_ABORT << 16); | |
1556 | goto success; | |
1557 | } | |
7996a778 | 1558 | |
843c0a8a MC |
1559 | /* only have one tmf outstanding at a time */ |
1560 | if (conn->tmf_state != TMF_INITIAL) | |
7996a778 | 1561 | goto failed; |
843c0a8a | 1562 | conn->tmf_state = TMF_QUEUED; |
7996a778 | 1563 | |
843c0a8a MC |
1564 | hdr = &conn->tmhdr; |
1565 | iscsi_prep_abort_task_pdu(ctask, hdr); | |
1566 | ||
f6d5180c | 1567 | if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout)) { |
843c0a8a MC |
1568 | rc = FAILED; |
1569 | goto failed; | |
1570 | } | |
1571 | ||
1572 | switch (conn->tmf_state) { | |
1573 | case TMF_SUCCESS: | |
77a23c21 | 1574 | spin_unlock_bh(&session->lock); |
6724add1 | 1575 | iscsi_suspend_tx(conn); |
77a23c21 MC |
1576 | /* |
1577 | * clean up task if aborted. grab the recv lock as a writer | |
1578 | */ | |
1579 | write_lock_bh(conn->recv_lock); | |
1580 | spin_lock(&session->lock); | |
1581 | fail_command(conn, ctask, DID_ABORT << 16); | |
843c0a8a | 1582 | conn->tmf_state = TMF_INITIAL; |
77a23c21 MC |
1583 | spin_unlock(&session->lock); |
1584 | write_unlock_bh(conn->recv_lock); | |
6724add1 | 1585 | iscsi_start_tx(conn); |
77a23c21 | 1586 | goto success_unlocked; |
843c0a8a MC |
1587 | case TMF_TIMEDOUT: |
1588 | spin_unlock_bh(&session->lock); | |
1589 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1590 | goto failed_unlocked; | |
1591 | case TMF_NOT_FOUND: | |
1592 | if (!sc->SCp.ptr) { | |
1593 | conn->tmf_state = TMF_INITIAL; | |
7ea8b828 | 1594 | /* ctask completed before tmf abort response */ |
7ea8b828 | 1595 | debug_scsi("sc completed while abort in progress\n"); |
77a23c21 | 1596 | goto success; |
7ea8b828 MC |
1597 | } |
1598 | /* fall through */ | |
1599 | default: | |
843c0a8a MC |
1600 | conn->tmf_state = TMF_INITIAL; |
1601 | goto failed; | |
7996a778 MC |
1602 | } |
1603 | ||
77a23c21 | 1604 | success: |
7996a778 | 1605 | spin_unlock_bh(&session->lock); |
77a23c21 MC |
1606 | success_unlocked: |
1607 | debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, ctask->itt); | |
6724add1 | 1608 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1609 | return SUCCESS; |
1610 | ||
1611 | failed: | |
1612 | spin_unlock_bh(&session->lock); | |
77a23c21 | 1613 | failed_unlocked: |
843c0a8a MC |
1614 | debug_scsi("abort failed [sc %p itt 0x%x]\n", sc, |
1615 | ctask ? ctask->itt : 0); | |
6724add1 | 1616 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1617 | return FAILED; |
1618 | } | |
1619 | EXPORT_SYMBOL_GPL(iscsi_eh_abort); | |
1620 | ||
843c0a8a MC |
1621 | static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr) |
1622 | { | |
1623 | memset(hdr, 0, sizeof(*hdr)); | |
1624 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
1625 | hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK; | |
1626 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
1627 | int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun); | |
f6d5180c | 1628 | hdr->rtt = RESERVED_ITT; |
843c0a8a MC |
1629 | } |
1630 | ||
1631 | int iscsi_eh_device_reset(struct scsi_cmnd *sc) | |
1632 | { | |
1633 | struct Scsi_Host *host = sc->device->host; | |
1634 | struct iscsi_session *session = iscsi_hostdata(host->hostdata); | |
1635 | struct iscsi_conn *conn; | |
1636 | struct iscsi_tm *hdr; | |
1637 | int rc = FAILED; | |
1638 | ||
1639 | debug_scsi("LU Reset [sc %p lun %u]\n", sc, sc->device->lun); | |
1640 | ||
1641 | mutex_lock(&session->eh_mutex); | |
1642 | spin_lock_bh(&session->lock); | |
1643 | /* | |
1644 | * Just check if we are not logged in. We cannot check for | |
1645 | * the phase because the reset could come from a ioctl. | |
1646 | */ | |
1647 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN) | |
1648 | goto unlock; | |
1649 | conn = session->leadconn; | |
1650 | ||
1651 | /* only have one tmf outstanding at a time */ | |
1652 | if (conn->tmf_state != TMF_INITIAL) | |
1653 | goto unlock; | |
1654 | conn->tmf_state = TMF_QUEUED; | |
1655 | ||
1656 | hdr = &conn->tmhdr; | |
1657 | iscsi_prep_lun_reset_pdu(sc, hdr); | |
1658 | ||
f6d5180c MC |
1659 | if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age, |
1660 | session->lu_reset_timeout)) { | |
843c0a8a MC |
1661 | rc = FAILED; |
1662 | goto unlock; | |
1663 | } | |
1664 | ||
1665 | switch (conn->tmf_state) { | |
1666 | case TMF_SUCCESS: | |
1667 | break; | |
1668 | case TMF_TIMEDOUT: | |
1669 | spin_unlock_bh(&session->lock); | |
1670 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1671 | goto done; | |
1672 | default: | |
1673 | conn->tmf_state = TMF_INITIAL; | |
1674 | goto unlock; | |
1675 | } | |
1676 | ||
1677 | rc = SUCCESS; | |
1678 | spin_unlock_bh(&session->lock); | |
1679 | ||
1680 | iscsi_suspend_tx(conn); | |
1681 | /* need to grab the recv lock then session lock */ | |
1682 | write_lock_bh(conn->recv_lock); | |
1683 | spin_lock(&session->lock); | |
6eabafbe | 1684 | fail_all_commands(conn, sc->device->lun, DID_ERROR); |
843c0a8a MC |
1685 | conn->tmf_state = TMF_INITIAL; |
1686 | spin_unlock(&session->lock); | |
1687 | write_unlock_bh(conn->recv_lock); | |
1688 | ||
1689 | iscsi_start_tx(conn); | |
1690 | goto done; | |
1691 | ||
1692 | unlock: | |
1693 | spin_unlock_bh(&session->lock); | |
1694 | done: | |
1695 | debug_scsi("iscsi_eh_device_reset %s\n", | |
1696 | rc == SUCCESS ? "SUCCESS" : "FAILED"); | |
1697 | mutex_unlock(&session->eh_mutex); | |
1698 | return rc; | |
1699 | } | |
1700 | EXPORT_SYMBOL_GPL(iscsi_eh_device_reset); | |
1701 | ||
6320377f OK |
1702 | /* |
1703 | * Pre-allocate a pool of @max items of @item_size. By default, the pool | |
1704 | * should be accessed via kfifo_{get,put} on q->queue. | |
1705 | * Optionally, the caller can obtain the array of object pointers | |
1706 | * by passing in a non-NULL @items pointer | |
1707 | */ | |
7996a778 | 1708 | int |
6320377f | 1709 | iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size) |
7996a778 | 1710 | { |
6320377f | 1711 | int i, num_arrays = 1; |
7996a778 | 1712 | |
6320377f | 1713 | memset(q, 0, sizeof(*q)); |
7996a778 MC |
1714 | |
1715 | q->max = max; | |
6320377f OK |
1716 | |
1717 | /* If the user passed an items pointer, he wants a copy of | |
1718 | * the array. */ | |
1719 | if (items) | |
1720 | num_arrays++; | |
1721 | q->pool = kzalloc(num_arrays * max * sizeof(void*), GFP_KERNEL); | |
1722 | if (q->pool == NULL) | |
1723 | goto enomem; | |
7996a778 MC |
1724 | |
1725 | q->queue = kfifo_init((void*)q->pool, max * sizeof(void*), | |
1726 | GFP_KERNEL, NULL); | |
6320377f OK |
1727 | if (q->queue == ERR_PTR(-ENOMEM)) |
1728 | goto enomem; | |
7996a778 MC |
1729 | |
1730 | for (i = 0; i < max; i++) { | |
6320377f | 1731 | q->pool[i] = kzalloc(item_size, GFP_KERNEL); |
7996a778 | 1732 | if (q->pool[i] == NULL) { |
6320377f OK |
1733 | q->max = i; |
1734 | goto enomem; | |
7996a778 | 1735 | } |
7996a778 MC |
1736 | __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*)); |
1737 | } | |
6320377f OK |
1738 | |
1739 | if (items) { | |
1740 | *items = q->pool + max; | |
1741 | memcpy(*items, q->pool, max * sizeof(void *)); | |
1742 | } | |
1743 | ||
7996a778 | 1744 | return 0; |
6320377f OK |
1745 | |
1746 | enomem: | |
1747 | iscsi_pool_free(q); | |
1748 | return -ENOMEM; | |
7996a778 MC |
1749 | } |
1750 | EXPORT_SYMBOL_GPL(iscsi_pool_init); | |
1751 | ||
6320377f | 1752 | void iscsi_pool_free(struct iscsi_pool *q) |
7996a778 MC |
1753 | { |
1754 | int i; | |
1755 | ||
1756 | for (i = 0; i < q->max; i++) | |
6320377f OK |
1757 | kfree(q->pool[i]); |
1758 | if (q->pool) | |
1759 | kfree(q->pool); | |
7996a778 MC |
1760 | } |
1761 | EXPORT_SYMBOL_GPL(iscsi_pool_free); | |
1762 | ||
1763 | /* | |
1764 | * iSCSI Session's hostdata organization: | |
1765 | * | |
1766 | * *------------------* <== hostdata_session(host->hostdata) | |
1767 | * | ptr to class sess| | |
1768 | * |------------------| <== iscsi_hostdata(host->hostdata) | |
1769 | * | iscsi_session | | |
1770 | * *------------------* | |
1771 | */ | |
1772 | ||
1773 | #define hostdata_privsize(_sz) (sizeof(unsigned long) + _sz + \ | |
1774 | _sz % sizeof(unsigned long)) | |
1775 | ||
1776 | #define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata)) | |
1777 | ||
1778 | /** | |
1779 | * iscsi_session_setup - create iscsi cls session and host and session | |
1780 | * @scsit: scsi transport template | |
1781 | * @iscsit: iscsi transport template | |
1548271e MC |
1782 | * @cmds_max: scsi host can queue |
1783 | * @qdepth: scsi host cmds per lun | |
1784 | * @cmd_task_size: LLD ctask private data size | |
1785 | * @mgmt_task_size: LLD mtask private data size | |
7996a778 MC |
1786 | * @initial_cmdsn: initial CmdSN |
1787 | * @hostno: host no allocated | |
1788 | * | |
1789 | * This can be used by software iscsi_transports that allocate | |
1790 | * a session per scsi host. | |
1791 | **/ | |
1792 | struct iscsi_cls_session * | |
1793 | iscsi_session_setup(struct iscsi_transport *iscsit, | |
1794 | struct scsi_transport_template *scsit, | |
1548271e | 1795 | uint16_t cmds_max, uint16_t qdepth, |
7996a778 MC |
1796 | int cmd_task_size, int mgmt_task_size, |
1797 | uint32_t initial_cmdsn, uint32_t *hostno) | |
1798 | { | |
1799 | struct Scsi_Host *shost; | |
1800 | struct iscsi_session *session; | |
1801 | struct iscsi_cls_session *cls_session; | |
1802 | int cmd_i; | |
1803 | ||
1548271e MC |
1804 | if (qdepth > ISCSI_MAX_CMD_PER_LUN || qdepth < 1) { |
1805 | if (qdepth != 0) | |
1806 | printk(KERN_ERR "iscsi: invalid queue depth of %d. " | |
1807 | "Queue depth must be between 1 and %d.\n", | |
1808 | qdepth, ISCSI_MAX_CMD_PER_LUN); | |
1809 | qdepth = ISCSI_DEF_CMD_PER_LUN; | |
1810 | } | |
1811 | ||
31ed0bf4 MC |
1812 | if (!is_power_of_2(cmds_max) || cmds_max >= ISCSI_MGMT_ITT_OFFSET || |
1813 | cmds_max < 2) { | |
1548271e MC |
1814 | if (cmds_max != 0) |
1815 | printk(KERN_ERR "iscsi: invalid can_queue of %d. " | |
1816 | "can_queue must be a power of 2 and between " | |
1817 | "2 and %d - setting to %d.\n", cmds_max, | |
1818 | ISCSI_MGMT_ITT_OFFSET, ISCSI_DEF_XMIT_CMDS_MAX); | |
1819 | cmds_max = ISCSI_DEF_XMIT_CMDS_MAX; | |
1820 | } | |
1821 | ||
7996a778 MC |
1822 | shost = scsi_host_alloc(iscsit->host_template, |
1823 | hostdata_privsize(sizeof(*session))); | |
1824 | if (!shost) | |
1825 | return NULL; | |
1826 | ||
1548271e MC |
1827 | /* the iscsi layer takes one task for reserve */ |
1828 | shost->can_queue = cmds_max - 1; | |
1829 | shost->cmd_per_lun = qdepth; | |
7996a778 MC |
1830 | shost->max_id = 1; |
1831 | shost->max_channel = 0; | |
1832 | shost->max_lun = iscsit->max_lun; | |
1833 | shost->max_cmd_len = iscsit->max_cmd_len; | |
1834 | shost->transportt = scsit; | |
1835 | shost->transportt->create_work_queue = 1; | |
f6d5180c | 1836 | shost->transportt->eh_timed_out = iscsi_eh_cmd_timed_out; |
7996a778 MC |
1837 | *hostno = shost->host_no; |
1838 | ||
1839 | session = iscsi_hostdata(shost->hostdata); | |
1840 | memset(session, 0, sizeof(struct iscsi_session)); | |
1841 | session->host = shost; | |
1842 | session->state = ISCSI_STATE_FREE; | |
f6d5180c | 1843 | session->fast_abort = 1; |
4cd49ea1 MC |
1844 | session->lu_reset_timeout = 15; |
1845 | session->abort_timeout = 10; | |
7996a778 | 1846 | session->mgmtpool_max = ISCSI_MGMT_CMDS_MAX; |
1548271e | 1847 | session->cmds_max = cmds_max; |
e0726407 | 1848 | session->queued_cmdsn = session->cmdsn = initial_cmdsn; |
7996a778 MC |
1849 | session->exp_cmdsn = initial_cmdsn + 1; |
1850 | session->max_cmdsn = initial_cmdsn + 1; | |
1851 | session->max_r2t = 1; | |
1852 | session->tt = iscsit; | |
6724add1 | 1853 | mutex_init(&session->eh_mutex); |
7996a778 MC |
1854 | |
1855 | /* initialize SCSI PDU commands pool */ | |
1856 | if (iscsi_pool_init(&session->cmdpool, session->cmds_max, | |
1857 | (void***)&session->cmds, | |
1858 | cmd_task_size + sizeof(struct iscsi_cmd_task))) | |
1859 | goto cmdpool_alloc_fail; | |
1860 | ||
1861 | /* pre-format cmds pool with ITT */ | |
1862 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
1863 | struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; | |
1864 | ||
1865 | if (cmd_task_size) | |
1866 | ctask->dd_data = &ctask[1]; | |
1867 | ctask->itt = cmd_i; | |
b6c395ed | 1868 | INIT_LIST_HEAD(&ctask->running); |
7996a778 MC |
1869 | } |
1870 | ||
1871 | spin_lock_init(&session->lock); | |
7996a778 MC |
1872 | |
1873 | /* initialize immediate command pool */ | |
1874 | if (iscsi_pool_init(&session->mgmtpool, session->mgmtpool_max, | |
1875 | (void***)&session->mgmt_cmds, | |
1876 | mgmt_task_size + sizeof(struct iscsi_mgmt_task))) | |
1877 | goto mgmtpool_alloc_fail; | |
1878 | ||
1879 | ||
1880 | /* pre-format immediate cmds pool with ITT */ | |
1881 | for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) { | |
1882 | struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i]; | |
1883 | ||
1884 | if (mgmt_task_size) | |
1885 | mtask->dd_data = &mtask[1]; | |
1886 | mtask->itt = ISCSI_MGMT_ITT_OFFSET + cmd_i; | |
b6c395ed | 1887 | INIT_LIST_HEAD(&mtask->running); |
7996a778 MC |
1888 | } |
1889 | ||
1890 | if (scsi_add_host(shost, NULL)) | |
1891 | goto add_host_fail; | |
1892 | ||
f53a88da MC |
1893 | if (!try_module_get(iscsit->owner)) |
1894 | goto cls_session_fail; | |
1895 | ||
6a8a0d36 | 1896 | cls_session = iscsi_create_session(shost, iscsit, 0); |
7996a778 | 1897 | if (!cls_session) |
f53a88da | 1898 | goto module_put; |
7996a778 MC |
1899 | *(unsigned long*)shost->hostdata = (unsigned long)cls_session; |
1900 | ||
1901 | return cls_session; | |
1902 | ||
f53a88da MC |
1903 | module_put: |
1904 | module_put(iscsit->owner); | |
7996a778 MC |
1905 | cls_session_fail: |
1906 | scsi_remove_host(shost); | |
1907 | add_host_fail: | |
6320377f | 1908 | iscsi_pool_free(&session->mgmtpool); |
7996a778 | 1909 | mgmtpool_alloc_fail: |
6320377f | 1910 | iscsi_pool_free(&session->cmdpool); |
7996a778 MC |
1911 | cmdpool_alloc_fail: |
1912 | scsi_host_put(shost); | |
1913 | return NULL; | |
1914 | } | |
1915 | EXPORT_SYMBOL_GPL(iscsi_session_setup); | |
1916 | ||
1917 | /** | |
1918 | * iscsi_session_teardown - destroy session, host, and cls_session | |
1919 | * shost: scsi host | |
1920 | * | |
1921 | * This can be used by software iscsi_transports that allocate | |
1922 | * a session per scsi host. | |
1923 | **/ | |
1924 | void iscsi_session_teardown(struct iscsi_cls_session *cls_session) | |
1925 | { | |
1926 | struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); | |
1927 | struct iscsi_session *session = iscsi_hostdata(shost->hostdata); | |
63f75cc8 | 1928 | struct module *owner = cls_session->transport->owner; |
7996a778 | 1929 | |
26974789 | 1930 | iscsi_remove_session(cls_session); |
7996a778 MC |
1931 | scsi_remove_host(shost); |
1932 | ||
6320377f OK |
1933 | iscsi_pool_free(&session->mgmtpool); |
1934 | iscsi_pool_free(&session->cmdpool); | |
7996a778 | 1935 | |
b2c64167 MC |
1936 | kfree(session->password); |
1937 | kfree(session->password_in); | |
1938 | kfree(session->username); | |
1939 | kfree(session->username_in); | |
f3ff0c36 | 1940 | kfree(session->targetname); |
d8196ed2 | 1941 | kfree(session->netdev); |
0801c242 | 1942 | kfree(session->hwaddress); |
8ad5781a | 1943 | kfree(session->initiatorname); |
f3ff0c36 | 1944 | |
26974789 | 1945 | iscsi_free_session(cls_session); |
7996a778 | 1946 | scsi_host_put(shost); |
63f75cc8 | 1947 | module_put(owner); |
7996a778 MC |
1948 | } |
1949 | EXPORT_SYMBOL_GPL(iscsi_session_teardown); | |
1950 | ||
1951 | /** | |
1952 | * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn | |
1953 | * @cls_session: iscsi_cls_session | |
1954 | * @conn_idx: cid | |
1955 | **/ | |
1956 | struct iscsi_cls_conn * | |
1957 | iscsi_conn_setup(struct iscsi_cls_session *cls_session, uint32_t conn_idx) | |
1958 | { | |
1959 | struct iscsi_session *session = class_to_transport_session(cls_session); | |
1960 | struct iscsi_conn *conn; | |
1961 | struct iscsi_cls_conn *cls_conn; | |
d36ab6f3 | 1962 | char *data; |
7996a778 MC |
1963 | |
1964 | cls_conn = iscsi_create_conn(cls_session, conn_idx); | |
1965 | if (!cls_conn) | |
1966 | return NULL; | |
1967 | conn = cls_conn->dd_data; | |
1968 | memset(conn, 0, sizeof(*conn)); | |
1969 | ||
1970 | conn->session = session; | |
1971 | conn->cls_conn = cls_conn; | |
1972 | conn->c_stage = ISCSI_CONN_INITIAL_STAGE; | |
1973 | conn->id = conn_idx; | |
1974 | conn->exp_statsn = 0; | |
843c0a8a | 1975 | conn->tmf_state = TMF_INITIAL; |
f6d5180c MC |
1976 | |
1977 | init_timer(&conn->transport_timer); | |
1978 | conn->transport_timer.data = (unsigned long)conn; | |
1979 | conn->transport_timer.function = iscsi_check_transport_timeouts; | |
1980 | ||
7996a778 MC |
1981 | INIT_LIST_HEAD(&conn->run_list); |
1982 | INIT_LIST_HEAD(&conn->mgmt_run_list); | |
843c0a8a | 1983 | INIT_LIST_HEAD(&conn->mgmtqueue); |
b6c395ed | 1984 | INIT_LIST_HEAD(&conn->xmitqueue); |
843c0a8a | 1985 | INIT_LIST_HEAD(&conn->requeue); |
c4028958 | 1986 | INIT_WORK(&conn->xmitwork, iscsi_xmitworker); |
7996a778 MC |
1987 | |
1988 | /* allocate login_mtask used for the login/text sequences */ | |
1989 | spin_lock_bh(&session->lock); | |
1990 | if (!__kfifo_get(session->mgmtpool.queue, | |
1991 | (void*)&conn->login_mtask, | |
1992 | sizeof(void*))) { | |
1993 | spin_unlock_bh(&session->lock); | |
1994 | goto login_mtask_alloc_fail; | |
1995 | } | |
1996 | spin_unlock_bh(&session->lock); | |
1997 | ||
bf32ed33 | 1998 | data = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN, GFP_KERNEL); |
d36ab6f3 MC |
1999 | if (!data) |
2000 | goto login_mtask_data_alloc_fail; | |
c8dc1e52 | 2001 | conn->login_mtask->data = conn->data = data; |
d36ab6f3 | 2002 | |
843c0a8a | 2003 | init_timer(&conn->tmf_timer); |
7996a778 MC |
2004 | init_waitqueue_head(&conn->ehwait); |
2005 | ||
2006 | return cls_conn; | |
2007 | ||
d36ab6f3 MC |
2008 | login_mtask_data_alloc_fail: |
2009 | __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask, | |
2010 | sizeof(void*)); | |
7996a778 | 2011 | login_mtask_alloc_fail: |
7996a778 MC |
2012 | iscsi_destroy_conn(cls_conn); |
2013 | return NULL; | |
2014 | } | |
2015 | EXPORT_SYMBOL_GPL(iscsi_conn_setup); | |
2016 | ||
2017 | /** | |
2018 | * iscsi_conn_teardown - teardown iscsi connection | |
2019 | * cls_conn: iscsi class connection | |
2020 | * | |
2021 | * TODO: we may need to make this into a two step process | |
2022 | * like scsi-mls remove + put host | |
2023 | */ | |
2024 | void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn) | |
2025 | { | |
2026 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2027 | struct iscsi_session *session = conn->session; | |
2028 | unsigned long flags; | |
2029 | ||
f6d5180c MC |
2030 | del_timer_sync(&conn->transport_timer); |
2031 | ||
7996a778 MC |
2032 | spin_lock_bh(&session->lock); |
2033 | conn->c_stage = ISCSI_CONN_CLEANUP_WAIT; | |
2034 | if (session->leadconn == conn) { | |
2035 | /* | |
2036 | * leading connection? then give up on recovery. | |
2037 | */ | |
2038 | session->state = ISCSI_STATE_TERMINATE; | |
2039 | wake_up(&conn->ehwait); | |
2040 | } | |
2041 | spin_unlock_bh(&session->lock); | |
2042 | ||
7996a778 MC |
2043 | /* |
2044 | * Block until all in-progress commands for this connection | |
2045 | * time out or fail. | |
2046 | */ | |
2047 | for (;;) { | |
2048 | spin_lock_irqsave(session->host->host_lock, flags); | |
2049 | if (!session->host->host_busy) { /* OK for ERL == 0 */ | |
2050 | spin_unlock_irqrestore(session->host->host_lock, flags); | |
2051 | break; | |
2052 | } | |
2053 | spin_unlock_irqrestore(session->host->host_lock, flags); | |
2054 | msleep_interruptible(500); | |
322d739d MC |
2055 | iscsi_conn_printk(KERN_INFO, conn, "iscsi conn_destroy(): " |
2056 | "host_busy %d host_failed %d\n", | |
2057 | session->host->host_busy, | |
2058 | session->host->host_failed); | |
7996a778 MC |
2059 | /* |
2060 | * force eh_abort() to unblock | |
2061 | */ | |
2062 | wake_up(&conn->ehwait); | |
2063 | } | |
2064 | ||
779ea120 | 2065 | /* flush queued up work because we free the connection below */ |
843c0a8a | 2066 | iscsi_suspend_tx(conn); |
779ea120 | 2067 | |
7996a778 | 2068 | spin_lock_bh(&session->lock); |
c8dc1e52 | 2069 | kfree(conn->data); |
f3ff0c36 | 2070 | kfree(conn->persistent_address); |
7996a778 MC |
2071 | __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask, |
2072 | sizeof(void*)); | |
e0726407 | 2073 | if (session->leadconn == conn) |
7996a778 | 2074 | session->leadconn = NULL; |
7996a778 MC |
2075 | spin_unlock_bh(&session->lock); |
2076 | ||
7996a778 MC |
2077 | iscsi_destroy_conn(cls_conn); |
2078 | } | |
2079 | EXPORT_SYMBOL_GPL(iscsi_conn_teardown); | |
2080 | ||
2081 | int iscsi_conn_start(struct iscsi_cls_conn *cls_conn) | |
2082 | { | |
2083 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2084 | struct iscsi_session *session = conn->session; | |
2085 | ||
ffd0436e | 2086 | if (!session) { |
322d739d MC |
2087 | iscsi_conn_printk(KERN_ERR, conn, |
2088 | "can't start unbound connection\n"); | |
7996a778 MC |
2089 | return -EPERM; |
2090 | } | |
2091 | ||
db98ccde MC |
2092 | if ((session->imm_data_en || !session->initial_r2t_en) && |
2093 | session->first_burst > session->max_burst) { | |
322d739d MC |
2094 | iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: " |
2095 | "first_burst %d max_burst %d\n", | |
2096 | session->first_burst, session->max_burst); | |
ffd0436e MC |
2097 | return -EINVAL; |
2098 | } | |
2099 | ||
f6d5180c | 2100 | if (conn->ping_timeout && !conn->recv_timeout) { |
322d739d MC |
2101 | iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of " |
2102 | "zero. Using 5 seconds\n."); | |
f6d5180c MC |
2103 | conn->recv_timeout = 5; |
2104 | } | |
2105 | ||
2106 | if (conn->recv_timeout && !conn->ping_timeout) { | |
322d739d MC |
2107 | iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of " |
2108 | "zero. Using 5 seconds.\n"); | |
f6d5180c MC |
2109 | conn->ping_timeout = 5; |
2110 | } | |
2111 | ||
7996a778 MC |
2112 | spin_lock_bh(&session->lock); |
2113 | conn->c_stage = ISCSI_CONN_STARTED; | |
2114 | session->state = ISCSI_STATE_LOGGED_IN; | |
e0726407 | 2115 | session->queued_cmdsn = session->cmdsn; |
7996a778 | 2116 | |
f6d5180c MC |
2117 | conn->last_recv = jiffies; |
2118 | conn->last_ping = jiffies; | |
2119 | if (conn->recv_timeout && conn->ping_timeout) | |
2120 | mod_timer(&conn->transport_timer, | |
2121 | jiffies + (conn->recv_timeout * HZ)); | |
2122 | ||
7996a778 MC |
2123 | switch(conn->stop_stage) { |
2124 | case STOP_CONN_RECOVER: | |
2125 | /* | |
2126 | * unblock eh_abort() if it is blocked. re-try all | |
2127 | * commands after successful recovery | |
2128 | */ | |
7996a778 | 2129 | conn->stop_stage = 0; |
843c0a8a | 2130 | conn->tmf_state = TMF_INITIAL; |
7996a778 | 2131 | session->age++; |
8b1d0343 MC |
2132 | if (session->age == 16) |
2133 | session->age = 0; | |
6eabafbe | 2134 | break; |
7996a778 | 2135 | case STOP_CONN_TERM: |
7996a778 | 2136 | conn->stop_stage = 0; |
7996a778 MC |
2137 | break; |
2138 | default: | |
2139 | break; | |
2140 | } | |
2141 | spin_unlock_bh(&session->lock); | |
2142 | ||
6eabafbe MC |
2143 | iscsi_unblock_session(session_to_cls(session)); |
2144 | wake_up(&conn->ehwait); | |
7996a778 MC |
2145 | return 0; |
2146 | } | |
2147 | EXPORT_SYMBOL_GPL(iscsi_conn_start); | |
2148 | ||
2149 | static void | |
2150 | flush_control_queues(struct iscsi_session *session, struct iscsi_conn *conn) | |
2151 | { | |
2152 | struct iscsi_mgmt_task *mtask, *tmp; | |
2153 | ||
2154 | /* handle pending */ | |
843c0a8a MC |
2155 | list_for_each_entry_safe(mtask, tmp, &conn->mgmtqueue, running) { |
2156 | debug_scsi("flushing pending mgmt task itt 0x%x\n", mtask->itt); | |
b3a7ea8d | 2157 | iscsi_free_mgmt_task(conn, mtask); |
7996a778 MC |
2158 | } |
2159 | ||
2160 | /* handle running */ | |
2161 | list_for_each_entry_safe(mtask, tmp, &conn->mgmt_run_list, running) { | |
2162 | debug_scsi("flushing running mgmt task itt 0x%x\n", mtask->itt); | |
b3a7ea8d | 2163 | iscsi_free_mgmt_task(conn, mtask); |
7996a778 MC |
2164 | } |
2165 | ||
2166 | conn->mtask = NULL; | |
2167 | } | |
2168 | ||
656cffc9 MC |
2169 | static void iscsi_start_session_recovery(struct iscsi_session *session, |
2170 | struct iscsi_conn *conn, int flag) | |
7996a778 | 2171 | { |
ed2abc7f MC |
2172 | int old_stop_stage; |
2173 | ||
f6d5180c MC |
2174 | del_timer_sync(&conn->transport_timer); |
2175 | ||
6724add1 | 2176 | mutex_lock(&session->eh_mutex); |
7996a778 | 2177 | spin_lock_bh(&session->lock); |
ed2abc7f | 2178 | if (conn->stop_stage == STOP_CONN_TERM) { |
7996a778 | 2179 | spin_unlock_bh(&session->lock); |
6724add1 MC |
2180 | mutex_unlock(&session->eh_mutex); |
2181 | return; | |
2182 | } | |
2183 | ||
2184 | /* | |
2185 | * The LLD either freed/unset the lock on us, or userspace called | |
2186 | * stop but did not create a proper connection (connection was never | |
2187 | * bound or it was unbound then stop was called). | |
2188 | */ | |
2189 | if (!conn->recv_lock) { | |
2190 | spin_unlock_bh(&session->lock); | |
2191 | mutex_unlock(&session->eh_mutex); | |
7996a778 MC |
2192 | return; |
2193 | } | |
ed2abc7f MC |
2194 | |
2195 | /* | |
2196 | * When this is called for the in_login state, we only want to clean | |
67a61114 MC |
2197 | * up the login task and connection. We do not need to block and set |
2198 | * the recovery state again | |
ed2abc7f | 2199 | */ |
67a61114 MC |
2200 | if (flag == STOP_CONN_TERM) |
2201 | session->state = ISCSI_STATE_TERMINATE; | |
2202 | else if (conn->stop_stage != STOP_CONN_RECOVER) | |
2203 | session->state = ISCSI_STATE_IN_RECOVERY; | |
ed2abc7f MC |
2204 | |
2205 | old_stop_stage = conn->stop_stage; | |
7996a778 | 2206 | conn->stop_stage = flag; |
67a61114 | 2207 | conn->c_stage = ISCSI_CONN_STOPPED; |
7996a778 | 2208 | spin_unlock_bh(&session->lock); |
6724add1 MC |
2209 | |
2210 | iscsi_suspend_tx(conn); | |
7996a778 | 2211 | |
1c83469d MC |
2212 | write_lock_bh(conn->recv_lock); |
2213 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
2214 | write_unlock_bh(conn->recv_lock); | |
7996a778 | 2215 | |
7996a778 MC |
2216 | /* |
2217 | * for connection level recovery we should not calculate | |
2218 | * header digest. conn->hdr_size used for optimization | |
2219 | * in hdr_extract() and will be re-negotiated at | |
2220 | * set_param() time. | |
2221 | */ | |
2222 | if (flag == STOP_CONN_RECOVER) { | |
2223 | conn->hdrdgst_en = 0; | |
2224 | conn->datadgst_en = 0; | |
656cffc9 | 2225 | if (session->state == ISCSI_STATE_IN_RECOVERY && |
67a61114 MC |
2226 | old_stop_stage != STOP_CONN_RECOVER) { |
2227 | debug_scsi("blocking session\n"); | |
7996a778 | 2228 | iscsi_block_session(session_to_cls(session)); |
67a61114 | 2229 | } |
7996a778 | 2230 | } |
656cffc9 | 2231 | |
656cffc9 MC |
2232 | /* |
2233 | * flush queues. | |
2234 | */ | |
2235 | spin_lock_bh(&session->lock); | |
6eabafbe MC |
2236 | fail_all_commands(conn, -1, |
2237 | STOP_CONN_RECOVER ? DID_BUS_BUSY : DID_ERROR); | |
656cffc9 MC |
2238 | flush_control_queues(session, conn); |
2239 | spin_unlock_bh(&session->lock); | |
6724add1 | 2240 | mutex_unlock(&session->eh_mutex); |
7996a778 | 2241 | } |
7996a778 MC |
2242 | |
2243 | void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) | |
2244 | { | |
2245 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2246 | struct iscsi_session *session = conn->session; | |
2247 | ||
2248 | switch (flag) { | |
2249 | case STOP_CONN_RECOVER: | |
2250 | case STOP_CONN_TERM: | |
2251 | iscsi_start_session_recovery(session, conn, flag); | |
8d2860b3 | 2252 | break; |
7996a778 | 2253 | default: |
322d739d MC |
2254 | iscsi_conn_printk(KERN_ERR, conn, |
2255 | "invalid stop flag %d\n", flag); | |
7996a778 MC |
2256 | } |
2257 | } | |
2258 | EXPORT_SYMBOL_GPL(iscsi_conn_stop); | |
2259 | ||
2260 | int iscsi_conn_bind(struct iscsi_cls_session *cls_session, | |
2261 | struct iscsi_cls_conn *cls_conn, int is_leading) | |
2262 | { | |
2263 | struct iscsi_session *session = class_to_transport_session(cls_session); | |
98644047 | 2264 | struct iscsi_conn *conn = cls_conn->dd_data; |
7996a778 | 2265 | |
7996a778 | 2266 | spin_lock_bh(&session->lock); |
7996a778 MC |
2267 | if (is_leading) |
2268 | session->leadconn = conn; | |
98644047 | 2269 | spin_unlock_bh(&session->lock); |
7996a778 MC |
2270 | |
2271 | /* | |
2272 | * Unblock xmitworker(), Login Phase will pass through. | |
2273 | */ | |
2274 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
2275 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
2276 | return 0; | |
2277 | } | |
2278 | EXPORT_SYMBOL_GPL(iscsi_conn_bind); | |
2279 | ||
a54a52ca MC |
2280 | |
2281 | int iscsi_set_param(struct iscsi_cls_conn *cls_conn, | |
2282 | enum iscsi_param param, char *buf, int buflen) | |
2283 | { | |
2284 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2285 | struct iscsi_session *session = conn->session; | |
2286 | uint32_t value; | |
2287 | ||
2288 | switch(param) { | |
843c0a8a MC |
2289 | case ISCSI_PARAM_FAST_ABORT: |
2290 | sscanf(buf, "%d", &session->fast_abort); | |
2291 | break; | |
f6d5180c MC |
2292 | case ISCSI_PARAM_ABORT_TMO: |
2293 | sscanf(buf, "%d", &session->abort_timeout); | |
2294 | break; | |
2295 | case ISCSI_PARAM_LU_RESET_TMO: | |
2296 | sscanf(buf, "%d", &session->lu_reset_timeout); | |
2297 | break; | |
2298 | case ISCSI_PARAM_PING_TMO: | |
2299 | sscanf(buf, "%d", &conn->ping_timeout); | |
2300 | break; | |
2301 | case ISCSI_PARAM_RECV_TMO: | |
2302 | sscanf(buf, "%d", &conn->recv_timeout); | |
2303 | break; | |
a54a52ca MC |
2304 | case ISCSI_PARAM_MAX_RECV_DLENGTH: |
2305 | sscanf(buf, "%d", &conn->max_recv_dlength); | |
2306 | break; | |
2307 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
2308 | sscanf(buf, "%d", &conn->max_xmit_dlength); | |
2309 | break; | |
2310 | case ISCSI_PARAM_HDRDGST_EN: | |
2311 | sscanf(buf, "%d", &conn->hdrdgst_en); | |
2312 | break; | |
2313 | case ISCSI_PARAM_DATADGST_EN: | |
2314 | sscanf(buf, "%d", &conn->datadgst_en); | |
2315 | break; | |
2316 | case ISCSI_PARAM_INITIAL_R2T_EN: | |
2317 | sscanf(buf, "%d", &session->initial_r2t_en); | |
2318 | break; | |
2319 | case ISCSI_PARAM_MAX_R2T: | |
2320 | sscanf(buf, "%d", &session->max_r2t); | |
2321 | break; | |
2322 | case ISCSI_PARAM_IMM_DATA_EN: | |
2323 | sscanf(buf, "%d", &session->imm_data_en); | |
2324 | break; | |
2325 | case ISCSI_PARAM_FIRST_BURST: | |
2326 | sscanf(buf, "%d", &session->first_burst); | |
2327 | break; | |
2328 | case ISCSI_PARAM_MAX_BURST: | |
2329 | sscanf(buf, "%d", &session->max_burst); | |
2330 | break; | |
2331 | case ISCSI_PARAM_PDU_INORDER_EN: | |
2332 | sscanf(buf, "%d", &session->pdu_inorder_en); | |
2333 | break; | |
2334 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
2335 | sscanf(buf, "%d", &session->dataseq_inorder_en); | |
2336 | break; | |
2337 | case ISCSI_PARAM_ERL: | |
2338 | sscanf(buf, "%d", &session->erl); | |
2339 | break; | |
2340 | case ISCSI_PARAM_IFMARKER_EN: | |
2341 | sscanf(buf, "%d", &value); | |
2342 | BUG_ON(value); | |
2343 | break; | |
2344 | case ISCSI_PARAM_OFMARKER_EN: | |
2345 | sscanf(buf, "%d", &value); | |
2346 | BUG_ON(value); | |
2347 | break; | |
2348 | case ISCSI_PARAM_EXP_STATSN: | |
2349 | sscanf(buf, "%u", &conn->exp_statsn); | |
2350 | break; | |
b2c64167 MC |
2351 | case ISCSI_PARAM_USERNAME: |
2352 | kfree(session->username); | |
2353 | session->username = kstrdup(buf, GFP_KERNEL); | |
2354 | if (!session->username) | |
2355 | return -ENOMEM; | |
2356 | break; | |
2357 | case ISCSI_PARAM_USERNAME_IN: | |
2358 | kfree(session->username_in); | |
2359 | session->username_in = kstrdup(buf, GFP_KERNEL); | |
2360 | if (!session->username_in) | |
2361 | return -ENOMEM; | |
2362 | break; | |
2363 | case ISCSI_PARAM_PASSWORD: | |
2364 | kfree(session->password); | |
2365 | session->password = kstrdup(buf, GFP_KERNEL); | |
2366 | if (!session->password) | |
2367 | return -ENOMEM; | |
2368 | break; | |
2369 | case ISCSI_PARAM_PASSWORD_IN: | |
2370 | kfree(session->password_in); | |
2371 | session->password_in = kstrdup(buf, GFP_KERNEL); | |
2372 | if (!session->password_in) | |
2373 | return -ENOMEM; | |
2374 | break; | |
a54a52ca MC |
2375 | case ISCSI_PARAM_TARGET_NAME: |
2376 | /* this should not change between logins */ | |
2377 | if (session->targetname) | |
2378 | break; | |
2379 | ||
2380 | session->targetname = kstrdup(buf, GFP_KERNEL); | |
2381 | if (!session->targetname) | |
2382 | return -ENOMEM; | |
2383 | break; | |
2384 | case ISCSI_PARAM_TPGT: | |
2385 | sscanf(buf, "%d", &session->tpgt); | |
2386 | break; | |
2387 | case ISCSI_PARAM_PERSISTENT_PORT: | |
2388 | sscanf(buf, "%d", &conn->persistent_port); | |
2389 | break; | |
2390 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
2391 | /* | |
2392 | * this is the address returned in discovery so it should | |
2393 | * not change between logins. | |
2394 | */ | |
2395 | if (conn->persistent_address) | |
2396 | break; | |
2397 | ||
2398 | conn->persistent_address = kstrdup(buf, GFP_KERNEL); | |
2399 | if (!conn->persistent_address) | |
2400 | return -ENOMEM; | |
2401 | break; | |
2402 | default: | |
2403 | return -ENOSYS; | |
2404 | } | |
2405 | ||
2406 | return 0; | |
2407 | } | |
2408 | EXPORT_SYMBOL_GPL(iscsi_set_param); | |
2409 | ||
2410 | int iscsi_session_get_param(struct iscsi_cls_session *cls_session, | |
2411 | enum iscsi_param param, char *buf) | |
2412 | { | |
2413 | struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); | |
2414 | struct iscsi_session *session = iscsi_hostdata(shost->hostdata); | |
2415 | int len; | |
2416 | ||
2417 | switch(param) { | |
843c0a8a MC |
2418 | case ISCSI_PARAM_FAST_ABORT: |
2419 | len = sprintf(buf, "%d\n", session->fast_abort); | |
2420 | break; | |
f6d5180c MC |
2421 | case ISCSI_PARAM_ABORT_TMO: |
2422 | len = sprintf(buf, "%d\n", session->abort_timeout); | |
2423 | break; | |
2424 | case ISCSI_PARAM_LU_RESET_TMO: | |
2425 | len = sprintf(buf, "%d\n", session->lu_reset_timeout); | |
2426 | break; | |
a54a52ca MC |
2427 | case ISCSI_PARAM_INITIAL_R2T_EN: |
2428 | len = sprintf(buf, "%d\n", session->initial_r2t_en); | |
2429 | break; | |
2430 | case ISCSI_PARAM_MAX_R2T: | |
2431 | len = sprintf(buf, "%hu\n", session->max_r2t); | |
2432 | break; | |
2433 | case ISCSI_PARAM_IMM_DATA_EN: | |
2434 | len = sprintf(buf, "%d\n", session->imm_data_en); | |
2435 | break; | |
2436 | case ISCSI_PARAM_FIRST_BURST: | |
2437 | len = sprintf(buf, "%u\n", session->first_burst); | |
2438 | break; | |
2439 | case ISCSI_PARAM_MAX_BURST: | |
2440 | len = sprintf(buf, "%u\n", session->max_burst); | |
2441 | break; | |
2442 | case ISCSI_PARAM_PDU_INORDER_EN: | |
2443 | len = sprintf(buf, "%d\n", session->pdu_inorder_en); | |
2444 | break; | |
2445 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
2446 | len = sprintf(buf, "%d\n", session->dataseq_inorder_en); | |
2447 | break; | |
2448 | case ISCSI_PARAM_ERL: | |
2449 | len = sprintf(buf, "%d\n", session->erl); | |
2450 | break; | |
2451 | case ISCSI_PARAM_TARGET_NAME: | |
2452 | len = sprintf(buf, "%s\n", session->targetname); | |
2453 | break; | |
2454 | case ISCSI_PARAM_TPGT: | |
2455 | len = sprintf(buf, "%d\n", session->tpgt); | |
2456 | break; | |
b2c64167 MC |
2457 | case ISCSI_PARAM_USERNAME: |
2458 | len = sprintf(buf, "%s\n", session->username); | |
2459 | break; | |
2460 | case ISCSI_PARAM_USERNAME_IN: | |
2461 | len = sprintf(buf, "%s\n", session->username_in); | |
2462 | break; | |
2463 | case ISCSI_PARAM_PASSWORD: | |
2464 | len = sprintf(buf, "%s\n", session->password); | |
2465 | break; | |
2466 | case ISCSI_PARAM_PASSWORD_IN: | |
2467 | len = sprintf(buf, "%s\n", session->password_in); | |
2468 | break; | |
a54a52ca MC |
2469 | default: |
2470 | return -ENOSYS; | |
2471 | } | |
2472 | ||
2473 | return len; | |
2474 | } | |
2475 | EXPORT_SYMBOL_GPL(iscsi_session_get_param); | |
2476 | ||
2477 | int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn, | |
2478 | enum iscsi_param param, char *buf) | |
2479 | { | |
2480 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2481 | int len; | |
2482 | ||
2483 | switch(param) { | |
f6d5180c MC |
2484 | case ISCSI_PARAM_PING_TMO: |
2485 | len = sprintf(buf, "%u\n", conn->ping_timeout); | |
2486 | break; | |
2487 | case ISCSI_PARAM_RECV_TMO: | |
2488 | len = sprintf(buf, "%u\n", conn->recv_timeout); | |
2489 | break; | |
a54a52ca MC |
2490 | case ISCSI_PARAM_MAX_RECV_DLENGTH: |
2491 | len = sprintf(buf, "%u\n", conn->max_recv_dlength); | |
2492 | break; | |
2493 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
2494 | len = sprintf(buf, "%u\n", conn->max_xmit_dlength); | |
2495 | break; | |
2496 | case ISCSI_PARAM_HDRDGST_EN: | |
2497 | len = sprintf(buf, "%d\n", conn->hdrdgst_en); | |
2498 | break; | |
2499 | case ISCSI_PARAM_DATADGST_EN: | |
2500 | len = sprintf(buf, "%d\n", conn->datadgst_en); | |
2501 | break; | |
2502 | case ISCSI_PARAM_IFMARKER_EN: | |
2503 | len = sprintf(buf, "%d\n", conn->ifmarker_en); | |
2504 | break; | |
2505 | case ISCSI_PARAM_OFMARKER_EN: | |
2506 | len = sprintf(buf, "%d\n", conn->ofmarker_en); | |
2507 | break; | |
2508 | case ISCSI_PARAM_EXP_STATSN: | |
2509 | len = sprintf(buf, "%u\n", conn->exp_statsn); | |
2510 | break; | |
2511 | case ISCSI_PARAM_PERSISTENT_PORT: | |
2512 | len = sprintf(buf, "%d\n", conn->persistent_port); | |
2513 | break; | |
2514 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
2515 | len = sprintf(buf, "%s\n", conn->persistent_address); | |
2516 | break; | |
2517 | default: | |
2518 | return -ENOSYS; | |
2519 | } | |
2520 | ||
2521 | return len; | |
2522 | } | |
2523 | EXPORT_SYMBOL_GPL(iscsi_conn_get_param); | |
2524 | ||
0801c242 MC |
2525 | int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param, |
2526 | char *buf) | |
2527 | { | |
2528 | struct iscsi_session *session = iscsi_hostdata(shost->hostdata); | |
2529 | int len; | |
2530 | ||
2531 | switch (param) { | |
d8196ed2 MC |
2532 | case ISCSI_HOST_PARAM_NETDEV_NAME: |
2533 | if (!session->netdev) | |
2534 | len = sprintf(buf, "%s\n", "default"); | |
2535 | else | |
2536 | len = sprintf(buf, "%s\n", session->netdev); | |
2537 | break; | |
0801c242 MC |
2538 | case ISCSI_HOST_PARAM_HWADDRESS: |
2539 | if (!session->hwaddress) | |
2540 | len = sprintf(buf, "%s\n", "default"); | |
2541 | else | |
2542 | len = sprintf(buf, "%s\n", session->hwaddress); | |
2543 | break; | |
8ad5781a MC |
2544 | case ISCSI_HOST_PARAM_INITIATOR_NAME: |
2545 | if (!session->initiatorname) | |
2546 | len = sprintf(buf, "%s\n", "unknown"); | |
2547 | else | |
2548 | len = sprintf(buf, "%s\n", session->initiatorname); | |
2549 | break; | |
2550 | ||
0801c242 MC |
2551 | default: |
2552 | return -ENOSYS; | |
2553 | } | |
2554 | ||
2555 | return len; | |
2556 | } | |
2557 | EXPORT_SYMBOL_GPL(iscsi_host_get_param); | |
2558 | ||
2559 | int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param, | |
2560 | char *buf, int buflen) | |
2561 | { | |
2562 | struct iscsi_session *session = iscsi_hostdata(shost->hostdata); | |
2563 | ||
2564 | switch (param) { | |
d8196ed2 MC |
2565 | case ISCSI_HOST_PARAM_NETDEV_NAME: |
2566 | if (!session->netdev) | |
2567 | session->netdev = kstrdup(buf, GFP_KERNEL); | |
2568 | break; | |
0801c242 MC |
2569 | case ISCSI_HOST_PARAM_HWADDRESS: |
2570 | if (!session->hwaddress) | |
2571 | session->hwaddress = kstrdup(buf, GFP_KERNEL); | |
2572 | break; | |
8ad5781a MC |
2573 | case ISCSI_HOST_PARAM_INITIATOR_NAME: |
2574 | if (!session->initiatorname) | |
2575 | session->initiatorname = kstrdup(buf, GFP_KERNEL); | |
2576 | break; | |
0801c242 MC |
2577 | default: |
2578 | return -ENOSYS; | |
2579 | } | |
2580 | ||
2581 | return 0; | |
2582 | } | |
2583 | EXPORT_SYMBOL_GPL(iscsi_host_set_param); | |
2584 | ||
7996a778 MC |
2585 | MODULE_AUTHOR("Mike Christie"); |
2586 | MODULE_DESCRIPTION("iSCSI library functions"); | |
2587 | MODULE_LICENSE("GPL"); |