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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 | ||
77a23c21 MC |
41 | /* Serial Number Arithmetic, 32 bits, less than, RFC1982 */ |
42 | #define SNA32_CHECK 2147483648UL | |
7996a778 | 43 | |
77a23c21 MC |
44 | static int iscsi_sna_lt(u32 n1, u32 n2) |
45 | { | |
46 | return n1 != n2 && ((n1 < n2 && (n2 - n1 < SNA32_CHECK)) || | |
47 | (n1 > n2 && (n2 - n1 < SNA32_CHECK))); | |
48 | } | |
49 | ||
50 | /* Serial Number Arithmetic, 32 bits, less than, RFC1982 */ | |
51 | static int iscsi_sna_lte(u32 n1, u32 n2) | |
52 | { | |
53 | return n1 == n2 || ((n1 < n2 && (n2 - n1 < SNA32_CHECK)) || | |
54 | (n1 > n2 && (n2 - n1 < SNA32_CHECK))); | |
55 | } | |
56 | ||
57 | void | |
58 | iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr) | |
7996a778 MC |
59 | { |
60 | uint32_t max_cmdsn = be32_to_cpu(hdr->max_cmdsn); | |
61 | uint32_t exp_cmdsn = be32_to_cpu(hdr->exp_cmdsn); | |
62 | ||
77a23c21 MC |
63 | /* |
64 | * standard specifies this check for when to update expected and | |
65 | * max sequence numbers | |
66 | */ | |
67 | if (iscsi_sna_lt(max_cmdsn, exp_cmdsn - 1)) | |
68 | return; | |
69 | ||
70 | if (exp_cmdsn != session->exp_cmdsn && | |
71 | !iscsi_sna_lt(exp_cmdsn, session->exp_cmdsn)) | |
7996a778 MC |
72 | session->exp_cmdsn = exp_cmdsn; |
73 | ||
77a23c21 MC |
74 | if (max_cmdsn != session->max_cmdsn && |
75 | !iscsi_sna_lt(max_cmdsn, session->max_cmdsn)) { | |
76 | session->max_cmdsn = max_cmdsn; | |
77 | /* | |
78 | * if the window closed with IO queued, then kick the | |
79 | * xmit thread | |
80 | */ | |
81 | if (!list_empty(&session->leadconn->xmitqueue) || | |
843c0a8a | 82 | !list_empty(&session->leadconn->mgmtqueue)) |
77a23c21 MC |
83 | scsi_queue_work(session->host, |
84 | &session->leadconn->xmitwork); | |
85 | } | |
7996a778 | 86 | } |
77a23c21 | 87 | EXPORT_SYMBOL_GPL(iscsi_update_cmdsn); |
7996a778 MC |
88 | |
89 | void iscsi_prep_unsolicit_data_pdu(struct iscsi_cmd_task *ctask, | |
ffd0436e | 90 | struct iscsi_data *hdr) |
7996a778 MC |
91 | { |
92 | struct iscsi_conn *conn = ctask->conn; | |
93 | ||
94 | memset(hdr, 0, sizeof(struct iscsi_data)); | |
95 | hdr->ttt = cpu_to_be32(ISCSI_RESERVED_TAG); | |
96 | hdr->datasn = cpu_to_be32(ctask->unsol_datasn); | |
97 | ctask->unsol_datasn++; | |
98 | hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; | |
99 | memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); | |
100 | ||
101 | hdr->itt = ctask->hdr->itt; | |
102 | hdr->exp_statsn = cpu_to_be32(conn->exp_statsn); | |
ffd0436e | 103 | hdr->offset = cpu_to_be32(ctask->unsol_offset); |
7996a778 MC |
104 | |
105 | if (ctask->unsol_count > conn->max_xmit_dlength) { | |
106 | hton24(hdr->dlength, conn->max_xmit_dlength); | |
107 | ctask->data_count = conn->max_xmit_dlength; | |
ffd0436e | 108 | ctask->unsol_offset += ctask->data_count; |
7996a778 MC |
109 | hdr->flags = 0; |
110 | } else { | |
111 | hton24(hdr->dlength, ctask->unsol_count); | |
112 | ctask->data_count = ctask->unsol_count; | |
113 | hdr->flags = ISCSI_FLAG_CMD_FINAL; | |
114 | } | |
115 | } | |
116 | EXPORT_SYMBOL_GPL(iscsi_prep_unsolicit_data_pdu); | |
117 | ||
004d6530 BH |
118 | static int iscsi_add_hdr(struct iscsi_cmd_task *ctask, unsigned len) |
119 | { | |
120 | unsigned exp_len = ctask->hdr_len + len; | |
121 | ||
122 | if (exp_len > ctask->hdr_max) { | |
123 | WARN_ON(1); | |
124 | return -EINVAL; | |
125 | } | |
126 | ||
127 | WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */ | |
128 | ctask->hdr_len = exp_len; | |
129 | return 0; | |
130 | } | |
131 | ||
38d1c069 BH |
132 | /* |
133 | * make an extended cdb AHS | |
134 | */ | |
135 | static int iscsi_prep_ecdb_ahs(struct iscsi_cmd_task *ctask) | |
136 | { | |
137 | struct scsi_cmnd *cmd = ctask->sc; | |
138 | unsigned rlen, pad_len; | |
139 | unsigned short ahslength; | |
140 | struct iscsi_ecdb_ahdr *ecdb_ahdr; | |
141 | int rc; | |
142 | ||
143 | ecdb_ahdr = iscsi_next_hdr(ctask); | |
144 | rlen = cmd->cmd_len - ISCSI_CDB_SIZE; | |
145 | ||
146 | BUG_ON(rlen > sizeof(ecdb_ahdr->ecdb)); | |
147 | ahslength = rlen + sizeof(ecdb_ahdr->reserved); | |
148 | ||
149 | pad_len = iscsi_padding(rlen); | |
150 | ||
151 | rc = iscsi_add_hdr(ctask, sizeof(ecdb_ahdr->ahslength) + | |
152 | sizeof(ecdb_ahdr->ahstype) + ahslength + pad_len); | |
153 | if (rc) | |
154 | return rc; | |
155 | ||
156 | if (pad_len) | |
157 | memset(&ecdb_ahdr->ecdb[rlen], 0, pad_len); | |
158 | ||
159 | ecdb_ahdr->ahslength = cpu_to_be16(ahslength); | |
160 | ecdb_ahdr->ahstype = ISCSI_AHSTYPE_CDB; | |
161 | ecdb_ahdr->reserved = 0; | |
162 | memcpy(ecdb_ahdr->ecdb, cmd->cmnd + ISCSI_CDB_SIZE, rlen); | |
163 | ||
164 | debug_scsi("iscsi_prep_ecdb_ahs: varlen_cdb_len %d " | |
165 | "rlen %d pad_len %d ahs_length %d iscsi_headers_size %u\n", | |
166 | cmd->cmd_len, rlen, pad_len, ahslength, ctask->hdr_len); | |
167 | ||
168 | return 0; | |
169 | } | |
170 | ||
c07d4444 BH |
171 | static int iscsi_prep_bidi_ahs(struct iscsi_cmd_task *ctask) |
172 | { | |
173 | struct scsi_cmnd *sc = ctask->sc; | |
174 | struct iscsi_rlength_ahdr *rlen_ahdr; | |
175 | int rc; | |
176 | ||
177 | rlen_ahdr = iscsi_next_hdr(ctask); | |
178 | rc = iscsi_add_hdr(ctask, sizeof(*rlen_ahdr)); | |
179 | if (rc) | |
180 | return rc; | |
181 | ||
182 | rlen_ahdr->ahslength = | |
183 | cpu_to_be16(sizeof(rlen_ahdr->read_length) + | |
184 | sizeof(rlen_ahdr->reserved)); | |
185 | rlen_ahdr->ahstype = ISCSI_AHSTYPE_RLENGTH; | |
186 | rlen_ahdr->reserved = 0; | |
187 | rlen_ahdr->read_length = cpu_to_be32(scsi_in(sc)->length); | |
188 | ||
189 | debug_scsi("bidi-in rlen_ahdr->read_length(%d) " | |
190 | "rlen_ahdr->ahslength(%d)\n", | |
191 | be32_to_cpu(rlen_ahdr->read_length), | |
192 | be16_to_cpu(rlen_ahdr->ahslength)); | |
193 | return 0; | |
194 | } | |
195 | ||
7996a778 MC |
196 | /** |
197 | * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu | |
198 | * @ctask: iscsi cmd task | |
199 | * | |
200 | * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set | |
201 | * fields like dlength or final based on how much data it sends | |
202 | */ | |
004d6530 | 203 | static int iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask) |
7996a778 MC |
204 | { |
205 | struct iscsi_conn *conn = ctask->conn; | |
206 | struct iscsi_session *session = conn->session; | |
207 | struct iscsi_cmd *hdr = ctask->hdr; | |
208 | struct scsi_cmnd *sc = ctask->sc; | |
38d1c069 | 209 | unsigned hdrlength, cmd_len; |
004d6530 | 210 | int rc; |
7996a778 | 211 | |
004d6530 BH |
212 | ctask->hdr_len = 0; |
213 | rc = iscsi_add_hdr(ctask, sizeof(*hdr)); | |
214 | if (rc) | |
215 | return rc; | |
a8ac6311 OK |
216 | hdr->opcode = ISCSI_OP_SCSI_CMD; |
217 | hdr->flags = ISCSI_ATTR_SIMPLE; | |
218 | int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun); | |
8b1d0343 | 219 | hdr->itt = build_itt(ctask->itt, session->age); |
a8ac6311 OK |
220 | hdr->cmdsn = cpu_to_be32(session->cmdsn); |
221 | session->cmdsn++; | |
222 | hdr->exp_statsn = cpu_to_be32(conn->exp_statsn); | |
38d1c069 BH |
223 | cmd_len = sc->cmd_len; |
224 | if (cmd_len < ISCSI_CDB_SIZE) | |
225 | memset(&hdr->cdb[cmd_len], 0, ISCSI_CDB_SIZE - cmd_len); | |
226 | else if (cmd_len > ISCSI_CDB_SIZE) { | |
227 | rc = iscsi_prep_ecdb_ahs(ctask); | |
228 | if (rc) | |
229 | return rc; | |
230 | cmd_len = ISCSI_CDB_SIZE; | |
231 | } | |
232 | memcpy(hdr->cdb, sc->cmnd, cmd_len); | |
7996a778 | 233 | |
218432c6 | 234 | ctask->imm_count = 0; |
c07d4444 BH |
235 | if (scsi_bidi_cmnd(sc)) { |
236 | hdr->flags |= ISCSI_FLAG_CMD_READ; | |
237 | rc = iscsi_prep_bidi_ahs(ctask); | |
238 | if (rc) | |
239 | return rc; | |
240 | } | |
7996a778 | 241 | if (sc->sc_data_direction == DMA_TO_DEVICE) { |
c07d4444 BH |
242 | unsigned out_len = scsi_out(sc)->length; |
243 | hdr->data_length = cpu_to_be32(out_len); | |
7996a778 MC |
244 | hdr->flags |= ISCSI_FLAG_CMD_WRITE; |
245 | /* | |
246 | * Write counters: | |
247 | * | |
248 | * imm_count bytes to be sent right after | |
249 | * SCSI PDU Header | |
250 | * | |
251 | * unsol_count bytes(as Data-Out) to be sent | |
252 | * without R2T ack right after | |
253 | * immediate data | |
254 | * | |
255 | * r2t_data_count bytes to be sent via R2T ack's | |
256 | * | |
257 | * pad_count bytes to be sent as zero-padding | |
258 | */ | |
7996a778 | 259 | ctask->unsol_count = 0; |
ffd0436e | 260 | ctask->unsol_offset = 0; |
7996a778 MC |
261 | ctask->unsol_datasn = 0; |
262 | ||
263 | if (session->imm_data_en) { | |
c07d4444 | 264 | if (out_len >= session->first_burst) |
7996a778 MC |
265 | ctask->imm_count = min(session->first_burst, |
266 | conn->max_xmit_dlength); | |
267 | else | |
c07d4444 | 268 | ctask->imm_count = min(out_len, |
7996a778 | 269 | conn->max_xmit_dlength); |
a8ac6311 | 270 | hton24(hdr->dlength, ctask->imm_count); |
7996a778 | 271 | } else |
a8ac6311 | 272 | zero_data(hdr->dlength); |
7996a778 | 273 | |
ffd0436e | 274 | if (!session->initial_r2t_en) { |
c07d4444 BH |
275 | ctask->unsol_count = min(session->first_burst, out_len) |
276 | - ctask->imm_count; | |
ffd0436e MC |
277 | ctask->unsol_offset = ctask->imm_count; |
278 | } | |
279 | ||
7996a778 MC |
280 | if (!ctask->unsol_count) |
281 | /* No unsolicit Data-Out's */ | |
a8ac6311 | 282 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; |
7996a778 | 283 | } else { |
7996a778 MC |
284 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; |
285 | zero_data(hdr->dlength); | |
c07d4444 | 286 | hdr->data_length = cpu_to_be32(scsi_in(sc)->length); |
7996a778 MC |
287 | |
288 | if (sc->sc_data_direction == DMA_FROM_DEVICE) | |
289 | hdr->flags |= ISCSI_FLAG_CMD_READ; | |
290 | } | |
291 | ||
004d6530 BH |
292 | /* calculate size of additional header segments (AHSs) */ |
293 | hdrlength = ctask->hdr_len - sizeof(*hdr); | |
294 | ||
295 | WARN_ON(hdrlength & (ISCSI_PAD_LEN-1)); | |
296 | hdrlength /= ISCSI_PAD_LEN; | |
297 | ||
298 | WARN_ON(hdrlength >= 256); | |
299 | hdr->hlength = hdrlength & 0xFF; | |
300 | ||
a8ac6311 OK |
301 | if (conn->session->tt->init_cmd_task(conn->ctask)) |
302 | return EIO; | |
77a23c21 | 303 | |
a8ac6311 | 304 | conn->scsicmd_pdus_cnt++; |
c07d4444 BH |
305 | debug_scsi("iscsi prep [%s cid %d sc %p cdb 0x%x itt 0x%x " |
306 | "len %d bidi_len %d cmdsn %d win %d]\n", | |
307 | scsi_bidi_cmnd(sc) ? "bidirectional" : | |
308 | sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read", | |
309 | conn->id, sc, sc->cmnd[0], ctask->itt, | |
310 | scsi_bufflen(sc), scsi_bidi_cmnd(sc) ? scsi_in(sc)->length : 0, | |
a8ac6311 | 311 | session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1); |
004d6530 | 312 | return 0; |
7996a778 | 313 | } |
7996a778 MC |
314 | |
315 | /** | |
316 | * iscsi_complete_command - return command back to scsi-ml | |
7996a778 MC |
317 | * @ctask: iscsi cmd task |
318 | * | |
319 | * Must be called with session lock. | |
320 | * This function returns the scsi command to scsi-ml and returns | |
321 | * the cmd task to the pool of available cmd tasks. | |
322 | */ | |
60ecebf5 | 323 | static void iscsi_complete_command(struct iscsi_cmd_task *ctask) |
7996a778 | 324 | { |
c1635cb7 MC |
325 | struct iscsi_conn *conn = ctask->conn; |
326 | struct iscsi_session *session = conn->session; | |
7996a778 MC |
327 | struct scsi_cmnd *sc = ctask->sc; |
328 | ||
b6c395ed | 329 | ctask->state = ISCSI_TASK_COMPLETED; |
7996a778 | 330 | ctask->sc = NULL; |
f47f2cf5 MC |
331 | /* SCSI eh reuses commands to verify us */ |
332 | sc->SCp.ptr = NULL; | |
c1635cb7 MC |
333 | if (conn->ctask == ctask) |
334 | conn->ctask = NULL; | |
7996a778 MC |
335 | list_del_init(&ctask->running); |
336 | __kfifo_put(session->cmdpool.queue, (void*)&ctask, sizeof(void*)); | |
337 | sc->scsi_done(sc); | |
338 | } | |
339 | ||
60ecebf5 MC |
340 | static void __iscsi_get_ctask(struct iscsi_cmd_task *ctask) |
341 | { | |
342 | atomic_inc(&ctask->refcount); | |
343 | } | |
344 | ||
60ecebf5 MC |
345 | static void __iscsi_put_ctask(struct iscsi_cmd_task *ctask) |
346 | { | |
e648f63c | 347 | if (atomic_dec_and_test(&ctask->refcount)) |
60ecebf5 | 348 | iscsi_complete_command(ctask); |
60ecebf5 MC |
349 | } |
350 | ||
b3a7ea8d MC |
351 | /* |
352 | * session lock must be held | |
353 | */ | |
354 | static void fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, | |
355 | int err) | |
356 | { | |
357 | struct scsi_cmnd *sc; | |
358 | ||
359 | sc = ctask->sc; | |
360 | if (!sc) | |
361 | return; | |
362 | ||
363 | if (ctask->state == ISCSI_TASK_PENDING) | |
364 | /* | |
365 | * cmd never made it to the xmit thread, so we should not count | |
366 | * the cmd in the sequencing | |
367 | */ | |
368 | conn->session->queued_cmdsn--; | |
369 | else | |
370 | conn->session->tt->cleanup_cmd_task(conn, ctask); | |
371 | ||
372 | sc->result = err; | |
c07d4444 BH |
373 | if (!scsi_bidi_cmnd(sc)) |
374 | scsi_set_resid(sc, scsi_bufflen(sc)); | |
375 | else { | |
376 | scsi_out(sc)->resid = scsi_out(sc)->length; | |
377 | scsi_in(sc)->resid = scsi_in(sc)->length; | |
378 | } | |
b3a7ea8d MC |
379 | if (conn->ctask == ctask) |
380 | conn->ctask = NULL; | |
381 | /* release ref from queuecommand */ | |
382 | __iscsi_put_ctask(ctask); | |
383 | } | |
384 | ||
385 | /** | |
386 | * iscsi_free_mgmt_task - return mgmt task back to pool | |
387 | * @conn: iscsi connection | |
388 | * @mtask: mtask | |
389 | * | |
390 | * Must be called with session lock. | |
391 | */ | |
392 | void iscsi_free_mgmt_task(struct iscsi_conn *conn, | |
393 | struct iscsi_mgmt_task *mtask) | |
394 | { | |
395 | list_del_init(&mtask->running); | |
396 | if (conn->login_mtask == mtask) | |
397 | return; | |
f6d5180c MC |
398 | |
399 | if (conn->ping_mtask == mtask) | |
400 | conn->ping_mtask = NULL; | |
b3a7ea8d MC |
401 | __kfifo_put(conn->session->mgmtpool.queue, |
402 | (void*)&mtask, sizeof(void*)); | |
403 | } | |
404 | EXPORT_SYMBOL_GPL(iscsi_free_mgmt_task); | |
405 | ||
f6d5180c MC |
406 | static struct iscsi_mgmt_task * |
407 | __iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
408 | char *data, uint32_t data_size) | |
409 | { | |
410 | struct iscsi_session *session = conn->session; | |
411 | struct iscsi_mgmt_task *mtask; | |
412 | ||
413 | if (session->state == ISCSI_STATE_TERMINATE) | |
414 | return NULL; | |
415 | ||
416 | if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) || | |
417 | hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE)) | |
418 | /* | |
419 | * Login and Text are sent serially, in | |
420 | * request-followed-by-response sequence. | |
421 | * Same mtask can be used. Same ITT must be used. | |
422 | * Note that login_mtask is preallocated at conn_create(). | |
423 | */ | |
424 | mtask = conn->login_mtask; | |
425 | else { | |
426 | BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE); | |
427 | BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED); | |
428 | ||
429 | if (!__kfifo_get(session->mgmtpool.queue, | |
430 | (void*)&mtask, sizeof(void*))) | |
431 | return NULL; | |
432 | } | |
433 | ||
434 | if (data_size) { | |
435 | memcpy(mtask->data, data, data_size); | |
436 | mtask->data_count = data_size; | |
437 | } else | |
438 | mtask->data_count = 0; | |
439 | ||
440 | memcpy(mtask->hdr, hdr, sizeof(struct iscsi_hdr)); | |
441 | INIT_LIST_HEAD(&mtask->running); | |
442 | list_add_tail(&mtask->running, &conn->mgmtqueue); | |
443 | return mtask; | |
444 | } | |
445 | ||
446 | int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr, | |
447 | char *data, uint32_t data_size) | |
448 | { | |
449 | struct iscsi_conn *conn = cls_conn->dd_data; | |
450 | struct iscsi_session *session = conn->session; | |
451 | int err = 0; | |
452 | ||
453 | spin_lock_bh(&session->lock); | |
454 | if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size)) | |
455 | err = -EPERM; | |
456 | spin_unlock_bh(&session->lock); | |
457 | scsi_queue_work(session->host, &conn->xmitwork); | |
458 | return err; | |
459 | } | |
460 | EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu); | |
461 | ||
7996a778 MC |
462 | /** |
463 | * iscsi_cmd_rsp - SCSI Command Response processing | |
464 | * @conn: iscsi connection | |
465 | * @hdr: iscsi header | |
466 | * @ctask: scsi command task | |
467 | * @data: cmd data buffer | |
468 | * @datalen: len of buffer | |
469 | * | |
470 | * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and | |
471 | * then completes the command and task. | |
472 | **/ | |
77a23c21 MC |
473 | static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
474 | struct iscsi_cmd_task *ctask, char *data, | |
475 | int datalen) | |
7996a778 | 476 | { |
7996a778 MC |
477 | struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)hdr; |
478 | struct iscsi_session *session = conn->session; | |
479 | struct scsi_cmnd *sc = ctask->sc; | |
480 | ||
77a23c21 | 481 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr); |
7996a778 MC |
482 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; |
483 | ||
484 | sc->result = (DID_OK << 16) | rhdr->cmd_status; | |
485 | ||
486 | if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) { | |
487 | sc->result = DID_ERROR << 16; | |
488 | goto out; | |
489 | } | |
490 | ||
491 | if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) { | |
9b80cb4b | 492 | uint16_t senselen; |
7996a778 MC |
493 | |
494 | if (datalen < 2) { | |
495 | invalid_datalen: | |
322d739d MC |
496 | iscsi_conn_printk(KERN_ERR, conn, |
497 | "Got CHECK_CONDITION but invalid data " | |
498 | "buffer size of %d\n", datalen); | |
7996a778 MC |
499 | sc->result = DID_BAD_TARGET << 16; |
500 | goto out; | |
501 | } | |
502 | ||
8eb00539 | 503 | senselen = be16_to_cpu(get_unaligned((__be16 *) data)); |
7996a778 MC |
504 | if (datalen < senselen) |
505 | goto invalid_datalen; | |
506 | ||
507 | memcpy(sc->sense_buffer, data + 2, | |
9b80cb4b | 508 | min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE)); |
7996a778 | 509 | debug_scsi("copied %d bytes of sense\n", |
8eb00539 | 510 | min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE)); |
7996a778 MC |
511 | } |
512 | ||
c07d4444 BH |
513 | if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW | |
514 | ISCSI_FLAG_CMD_BIDI_OVERFLOW)) { | |
515 | int res_count = be32_to_cpu(rhdr->bi_residual_count); | |
516 | ||
517 | if (scsi_bidi_cmnd(sc) && res_count > 0 && | |
518 | (rhdr->flags & ISCSI_FLAG_CMD_BIDI_OVERFLOW || | |
519 | res_count <= scsi_in(sc)->length)) | |
520 | scsi_in(sc)->resid = res_count; | |
521 | else | |
522 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
523 | } | |
524 | ||
7207fea4 BH |
525 | if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW | |
526 | ISCSI_FLAG_CMD_OVERFLOW)) { | |
7996a778 MC |
527 | int res_count = be32_to_cpu(rhdr->residual_count); |
528 | ||
7207fea4 BH |
529 | if (res_count > 0 && |
530 | (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || | |
531 | res_count <= scsi_bufflen(sc))) | |
c07d4444 | 532 | /* write side for bidi or uni-io set_resid */ |
1c138991 | 533 | scsi_set_resid(sc, res_count); |
7996a778 MC |
534 | else |
535 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
c07d4444 | 536 | } |
7996a778 MC |
537 | out: |
538 | debug_scsi("done [sc %lx res %d itt 0x%x]\n", | |
539 | (long)sc, sc->result, ctask->itt); | |
540 | conn->scsirsp_pdus_cnt++; | |
541 | ||
60ecebf5 | 542 | __iscsi_put_ctask(ctask); |
7996a778 MC |
543 | } |
544 | ||
7ea8b828 MC |
545 | static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr) |
546 | { | |
547 | struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr; | |
548 | ||
549 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
550 | conn->tmfrsp_pdus_cnt++; | |
551 | ||
843c0a8a | 552 | if (conn->tmf_state != TMF_QUEUED) |
7ea8b828 MC |
553 | return; |
554 | ||
555 | if (tmf->response == ISCSI_TMF_RSP_COMPLETE) | |
843c0a8a | 556 | conn->tmf_state = TMF_SUCCESS; |
7ea8b828 | 557 | else if (tmf->response == ISCSI_TMF_RSP_NO_TASK) |
843c0a8a | 558 | conn->tmf_state = TMF_NOT_FOUND; |
7ea8b828 | 559 | else |
843c0a8a | 560 | conn->tmf_state = TMF_FAILED; |
7ea8b828 MC |
561 | wake_up(&conn->ehwait); |
562 | } | |
563 | ||
f6d5180c MC |
564 | static void iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr) |
565 | { | |
566 | struct iscsi_nopout hdr; | |
567 | struct iscsi_mgmt_task *mtask; | |
568 | ||
569 | if (!rhdr && conn->ping_mtask) | |
570 | return; | |
571 | ||
572 | memset(&hdr, 0, sizeof(struct iscsi_nopout)); | |
573 | hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE; | |
574 | hdr.flags = ISCSI_FLAG_CMD_FINAL; | |
575 | ||
576 | if (rhdr) { | |
577 | memcpy(hdr.lun, rhdr->lun, 8); | |
578 | hdr.ttt = rhdr->ttt; | |
579 | hdr.itt = RESERVED_ITT; | |
580 | } else | |
581 | hdr.ttt = RESERVED_ITT; | |
582 | ||
583 | mtask = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0); | |
584 | if (!mtask) { | |
322d739d | 585 | iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n"); |
f6d5180c MC |
586 | return; |
587 | } | |
588 | ||
589 | /* only track our nops */ | |
590 | if (!rhdr) { | |
591 | conn->ping_mtask = mtask; | |
592 | conn->last_ping = jiffies; | |
593 | } | |
594 | scsi_queue_work(conn->session->host, &conn->xmitwork); | |
595 | } | |
596 | ||
62f38300 MC |
597 | static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
598 | char *data, int datalen) | |
599 | { | |
600 | struct iscsi_reject *reject = (struct iscsi_reject *)hdr; | |
601 | struct iscsi_hdr rejected_pdu; | |
602 | uint32_t itt; | |
603 | ||
604 | conn->exp_statsn = be32_to_cpu(reject->statsn) + 1; | |
605 | ||
606 | if (reject->reason == ISCSI_REASON_DATA_DIGEST_ERROR) { | |
607 | if (ntoh24(reject->dlength) > datalen) | |
608 | return ISCSI_ERR_PROTO; | |
609 | ||
610 | if (ntoh24(reject->dlength) >= sizeof(struct iscsi_hdr)) { | |
611 | memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr)); | |
b4377356 | 612 | itt = get_itt(rejected_pdu.itt); |
322d739d MC |
613 | iscsi_conn_printk(KERN_ERR, conn, |
614 | "itt 0x%x had pdu (op 0x%x) rejected " | |
615 | "due to DataDigest error.\n", itt, | |
616 | rejected_pdu.opcode); | |
62f38300 MC |
617 | } |
618 | } | |
619 | return 0; | |
620 | } | |
621 | ||
7996a778 MC |
622 | /** |
623 | * __iscsi_complete_pdu - complete pdu | |
624 | * @conn: iscsi conn | |
625 | * @hdr: iscsi header | |
626 | * @data: data buffer | |
627 | * @datalen: len of data buffer | |
628 | * | |
629 | * Completes pdu processing by freeing any resources allocated at | |
630 | * queuecommand or send generic. session lock must be held and verify | |
631 | * itt must have been called. | |
632 | */ | |
f8d9d654 AB |
633 | static int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
634 | char *data, int datalen) | |
7996a778 MC |
635 | { |
636 | struct iscsi_session *session = conn->session; | |
637 | int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0; | |
638 | struct iscsi_cmd_task *ctask; | |
639 | struct iscsi_mgmt_task *mtask; | |
640 | uint32_t itt; | |
641 | ||
f6d5180c | 642 | conn->last_recv = jiffies; |
0af967f5 MC |
643 | rc = iscsi_verify_itt(conn, hdr->itt); |
644 | if (rc) | |
645 | return rc; | |
646 | ||
b4377356 AV |
647 | if (hdr->itt != RESERVED_ITT) |
648 | itt = get_itt(hdr->itt); | |
7996a778 | 649 | else |
b4377356 | 650 | itt = ~0U; |
7996a778 MC |
651 | |
652 | if (itt < session->cmds_max) { | |
653 | ctask = session->cmds[itt]; | |
654 | ||
655 | debug_scsi("cmdrsp [op 0x%x cid %d itt 0x%x len %d]\n", | |
656 | opcode, conn->id, ctask->itt, datalen); | |
657 | ||
658 | switch(opcode) { | |
659 | case ISCSI_OP_SCSI_CMD_RSP: | |
660 | BUG_ON((void*)ctask != ctask->sc->SCp.ptr); | |
77a23c21 MC |
661 | iscsi_scsi_cmd_rsp(conn, hdr, ctask, data, |
662 | datalen); | |
7996a778 MC |
663 | break; |
664 | case ISCSI_OP_SCSI_DATA_IN: | |
665 | BUG_ON((void*)ctask != ctask->sc->SCp.ptr); | |
666 | if (hdr->flags & ISCSI_FLAG_DATA_STATUS) { | |
667 | conn->scsirsp_pdus_cnt++; | |
60ecebf5 | 668 | __iscsi_put_ctask(ctask); |
7996a778 MC |
669 | } |
670 | break; | |
671 | case ISCSI_OP_R2T: | |
672 | /* LLD handles this for now */ | |
673 | break; | |
674 | default: | |
675 | rc = ISCSI_ERR_BAD_OPCODE; | |
676 | break; | |
677 | } | |
678 | } else if (itt >= ISCSI_MGMT_ITT_OFFSET && | |
679 | itt < ISCSI_MGMT_ITT_OFFSET + session->mgmtpool_max) { | |
680 | mtask = session->mgmt_cmds[itt - ISCSI_MGMT_ITT_OFFSET]; | |
681 | ||
682 | debug_scsi("immrsp [op 0x%x cid %d itt 0x%x len %d]\n", | |
683 | opcode, conn->id, mtask->itt, datalen); | |
684 | ||
77a23c21 | 685 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); |
7996a778 | 686 | switch(opcode) { |
8d2860b3 | 687 | case ISCSI_OP_LOGOUT_RSP: |
c8dc1e52 MC |
688 | if (datalen) { |
689 | rc = ISCSI_ERR_PROTO; | |
690 | break; | |
691 | } | |
8d2860b3 MC |
692 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; |
693 | /* fall through */ | |
7996a778 MC |
694 | case ISCSI_OP_LOGIN_RSP: |
695 | case ISCSI_OP_TEXT_RSP: | |
8d2860b3 MC |
696 | /* |
697 | * login related PDU's exp_statsn is handled in | |
698 | * userspace | |
699 | */ | |
40527afe MC |
700 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) |
701 | rc = ISCSI_ERR_CONN_FAILED; | |
b3a7ea8d | 702 | iscsi_free_mgmt_task(conn, mtask); |
7996a778 MC |
703 | break; |
704 | case ISCSI_OP_SCSI_TMFUNC_RSP: | |
7996a778 MC |
705 | if (datalen) { |
706 | rc = ISCSI_ERR_PROTO; | |
707 | break; | |
708 | } | |
8d2860b3 | 709 | |
7ea8b828 | 710 | iscsi_tmf_rsp(conn, hdr); |
b3a7ea8d | 711 | iscsi_free_mgmt_task(conn, mtask); |
7996a778 MC |
712 | break; |
713 | case ISCSI_OP_NOOP_IN: | |
f6d5180c MC |
714 | if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || |
715 | datalen) { | |
7996a778 MC |
716 | rc = ISCSI_ERR_PROTO; |
717 | break; | |
718 | } | |
7996a778 MC |
719 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; |
720 | ||
f6d5180c MC |
721 | if (conn->ping_mtask != mtask) { |
722 | /* | |
723 | * If this is not in response to one of our | |
724 | * nops then it must be from userspace. | |
725 | */ | |
726 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, | |
727 | datalen)) | |
728 | rc = ISCSI_ERR_CONN_FAILED; | |
c8611f97 MC |
729 | } else |
730 | mod_timer(&conn->transport_timer, | |
731 | jiffies + conn->recv_timeout); | |
b3a7ea8d | 732 | iscsi_free_mgmt_task(conn, mtask); |
7996a778 MC |
733 | break; |
734 | default: | |
735 | rc = ISCSI_ERR_BAD_OPCODE; | |
736 | break; | |
737 | } | |
b4377356 | 738 | } else if (itt == ~0U) { |
77a23c21 | 739 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); |
62f38300 | 740 | |
7996a778 MC |
741 | switch(opcode) { |
742 | case ISCSI_OP_NOOP_IN: | |
40527afe | 743 | if (datalen) { |
7996a778 | 744 | rc = ISCSI_ERR_PROTO; |
40527afe MC |
745 | break; |
746 | } | |
747 | ||
b4377356 | 748 | if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG)) |
40527afe MC |
749 | break; |
750 | ||
f6d5180c | 751 | iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr); |
7996a778 MC |
752 | break; |
753 | case ISCSI_OP_REJECT: | |
62f38300 MC |
754 | rc = iscsi_handle_reject(conn, hdr, data, datalen); |
755 | break; | |
7996a778 | 756 | case ISCSI_OP_ASYNC_EVENT: |
8d2860b3 | 757 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; |
5831c737 MC |
758 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) |
759 | rc = ISCSI_ERR_CONN_FAILED; | |
7996a778 MC |
760 | break; |
761 | default: | |
762 | rc = ISCSI_ERR_BAD_OPCODE; | |
763 | break; | |
764 | } | |
765 | } else | |
766 | rc = ISCSI_ERR_BAD_ITT; | |
767 | ||
768 | return rc; | |
769 | } | |
7996a778 MC |
770 | |
771 | int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
772 | char *data, int datalen) | |
773 | { | |
774 | int rc; | |
775 | ||
776 | spin_lock(&conn->session->lock); | |
777 | rc = __iscsi_complete_pdu(conn, hdr, data, datalen); | |
778 | spin_unlock(&conn->session->lock); | |
779 | return rc; | |
780 | } | |
781 | EXPORT_SYMBOL_GPL(iscsi_complete_pdu); | |
782 | ||
0af967f5 | 783 | int iscsi_verify_itt(struct iscsi_conn *conn, itt_t itt) |
7996a778 MC |
784 | { |
785 | struct iscsi_session *session = conn->session; | |
786 | struct iscsi_cmd_task *ctask; | |
7996a778 | 787 | |
0af967f5 MC |
788 | if (itt == RESERVED_ITT) |
789 | return 0; | |
7996a778 | 790 | |
0af967f5 MC |
791 | if (((__force u32)itt & ISCSI_AGE_MASK) != |
792 | (session->age << ISCSI_AGE_SHIFT)) { | |
793 | iscsi_conn_printk(KERN_ERR, conn, | |
794 | "received itt %x expected session age (%x)\n", | |
795 | (__force u32)itt, | |
796 | session->age & ISCSI_AGE_MASK); | |
797 | return ISCSI_ERR_BAD_ITT; | |
798 | } | |
7996a778 MC |
799 | |
800 | if (itt < session->cmds_max) { | |
801 | ctask = session->cmds[itt]; | |
802 | ||
803 | if (!ctask->sc) { | |
322d739d MC |
804 | iscsi_conn_printk(KERN_INFO, conn, "dropping ctask " |
805 | "with itt 0x%x\n", ctask->itt); | |
7996a778 MC |
806 | /* force drop */ |
807 | return ISCSI_ERR_NO_SCSI_CMD; | |
808 | } | |
809 | ||
810 | if (ctask->sc->SCp.phase != session->age) { | |
322d739d MC |
811 | iscsi_conn_printk(KERN_ERR, conn, |
812 | "iscsi: ctask's session age %d, " | |
813 | "expected %d\n", ctask->sc->SCp.phase, | |
814 | session->age); | |
7996a778 MC |
815 | return ISCSI_ERR_SESSION_FAILED; |
816 | } | |
817 | } | |
818 | ||
7996a778 MC |
819 | return 0; |
820 | } | |
821 | EXPORT_SYMBOL_GPL(iscsi_verify_itt); | |
822 | ||
0af967f5 MC |
823 | struct iscsi_cmd_task * |
824 | iscsi_itt_to_ctask(struct iscsi_conn *conn, itt_t itt) | |
825 | { | |
826 | struct iscsi_session *session = conn->session; | |
827 | struct iscsi_cmd_task *ctask; | |
828 | uint32_t i; | |
829 | ||
830 | if (iscsi_verify_itt(conn, itt)) | |
831 | return NULL; | |
832 | ||
833 | if (itt == RESERVED_ITT) | |
834 | return NULL; | |
835 | ||
836 | i = get_itt(itt); | |
837 | if (i >= session->cmds_max) | |
838 | return NULL; | |
839 | ||
840 | ctask = session->cmds[i]; | |
841 | if (!ctask->sc) | |
842 | return NULL; | |
843 | ||
844 | if (ctask->sc->SCp.phase != session->age) | |
845 | return NULL; | |
846 | ||
847 | return ctask; | |
848 | } | |
849 | EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask); | |
850 | ||
7996a778 MC |
851 | void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err) |
852 | { | |
853 | struct iscsi_session *session = conn->session; | |
854 | unsigned long flags; | |
855 | ||
856 | spin_lock_irqsave(&session->lock, flags); | |
656cffc9 MC |
857 | if (session->state == ISCSI_STATE_FAILED) { |
858 | spin_unlock_irqrestore(&session->lock, flags); | |
859 | return; | |
860 | } | |
861 | ||
67a61114 | 862 | if (conn->stop_stage == 0) |
7996a778 MC |
863 | session->state = ISCSI_STATE_FAILED; |
864 | spin_unlock_irqrestore(&session->lock, flags); | |
865 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
866 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
867 | iscsi_conn_error(conn->cls_conn, err); | |
868 | } | |
869 | EXPORT_SYMBOL_GPL(iscsi_conn_failure); | |
870 | ||
77a23c21 MC |
871 | static void iscsi_prep_mtask(struct iscsi_conn *conn, |
872 | struct iscsi_mgmt_task *mtask) | |
873 | { | |
874 | struct iscsi_session *session = conn->session; | |
875 | struct iscsi_hdr *hdr = mtask->hdr; | |
876 | struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr; | |
877 | ||
878 | if (hdr->opcode != (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) && | |
879 | hdr->opcode != (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE)) | |
880 | nop->exp_statsn = cpu_to_be32(conn->exp_statsn); | |
881 | /* | |
882 | * pre-format CmdSN for outgoing PDU. | |
883 | */ | |
884 | nop->cmdsn = cpu_to_be32(session->cmdsn); | |
885 | if (hdr->itt != RESERVED_ITT) { | |
8b1d0343 | 886 | hdr->itt = build_itt(mtask->itt, session->age); |
e0726407 MC |
887 | /* |
888 | * TODO: We always use immediate, so we never hit this. | |
889 | * If we start to send tmfs or nops as non-immediate then | |
890 | * we should start checking the cmdsn numbers for mgmt tasks. | |
891 | */ | |
77a23c21 | 892 | if (conn->c_stage == ISCSI_CONN_STARTED && |
e0726407 MC |
893 | !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { |
894 | session->queued_cmdsn++; | |
77a23c21 | 895 | session->cmdsn++; |
e0726407 | 896 | } |
77a23c21 MC |
897 | } |
898 | ||
899 | if (session->tt->init_mgmt_task) | |
900 | session->tt->init_mgmt_task(conn, mtask); | |
901 | ||
902 | debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n", | |
843c0a8a MC |
903 | hdr->opcode & ISCSI_OPCODE_MASK, hdr->itt, |
904 | mtask->data_count); | |
77a23c21 MC |
905 | } |
906 | ||
05db888a | 907 | static int iscsi_xmit_mtask(struct iscsi_conn *conn) |
b5072ea0 MC |
908 | { |
909 | struct iscsi_hdr *hdr = conn->mtask->hdr; | |
b3a7ea8d | 910 | int rc; |
b5072ea0 | 911 | |
b3a7ea8d MC |
912 | if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT) |
913 | conn->session->state = ISCSI_STATE_LOGGING_OUT; | |
77a23c21 | 914 | spin_unlock_bh(&conn->session->lock); |
b3a7ea8d | 915 | |
b5072ea0 | 916 | rc = conn->session->tt->xmit_mgmt_task(conn, conn->mtask); |
77a23c21 | 917 | spin_lock_bh(&conn->session->lock); |
b5072ea0 MC |
918 | if (rc) |
919 | return rc; | |
920 | ||
05db888a MC |
921 | /* done with this in-progress mtask */ |
922 | conn->mtask = NULL; | |
b5072ea0 MC |
923 | return 0; |
924 | } | |
925 | ||
77a23c21 MC |
926 | static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn) |
927 | { | |
928 | struct iscsi_session *session = conn->session; | |
929 | ||
930 | /* | |
931 | * Check for iSCSI window and take care of CmdSN wrap-around | |
932 | */ | |
e0726407 MC |
933 | if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) { |
934 | debug_scsi("iSCSI CmdSN closed. ExpCmdSn %u MaxCmdSN %u " | |
935 | "CmdSN %u/%u\n", session->exp_cmdsn, | |
936 | session->max_cmdsn, session->cmdsn, | |
937 | session->queued_cmdsn); | |
77a23c21 MC |
938 | return -ENOSPC; |
939 | } | |
940 | return 0; | |
941 | } | |
942 | ||
943 | static int iscsi_xmit_ctask(struct iscsi_conn *conn) | |
944 | { | |
945 | struct iscsi_cmd_task *ctask = conn->ctask; | |
843c0a8a | 946 | int rc; |
77a23c21 MC |
947 | |
948 | __iscsi_get_ctask(ctask); | |
949 | spin_unlock_bh(&conn->session->lock); | |
950 | rc = conn->session->tt->xmit_cmd_task(conn, ctask); | |
951 | spin_lock_bh(&conn->session->lock); | |
952 | __iscsi_put_ctask(ctask); | |
77a23c21 MC |
953 | if (!rc) |
954 | /* done with this ctask */ | |
955 | conn->ctask = NULL; | |
956 | return rc; | |
957 | } | |
958 | ||
843c0a8a MC |
959 | /** |
960 | * iscsi_requeue_ctask - requeue ctask to run from session workqueue | |
961 | * @ctask: ctask to requeue | |
962 | * | |
963 | * LLDs that need to run a ctask from the session workqueue should call | |
964 | * this. The session lock must be held. | |
965 | */ | |
966 | void iscsi_requeue_ctask(struct iscsi_cmd_task *ctask) | |
967 | { | |
968 | struct iscsi_conn *conn = ctask->conn; | |
969 | ||
970 | list_move_tail(&ctask->running, &conn->requeue); | |
971 | scsi_queue_work(conn->session->host, &conn->xmitwork); | |
972 | } | |
973 | EXPORT_SYMBOL_GPL(iscsi_requeue_ctask); | |
974 | ||
7996a778 MC |
975 | /** |
976 | * iscsi_data_xmit - xmit any command into the scheduled connection | |
977 | * @conn: iscsi connection | |
978 | * | |
979 | * Notes: | |
980 | * The function can return -EAGAIN in which case the caller must | |
981 | * re-schedule it again later or recover. '0' return code means | |
982 | * successful xmit. | |
983 | **/ | |
984 | static int iscsi_data_xmit(struct iscsi_conn *conn) | |
985 | { | |
3219e529 | 986 | int rc = 0; |
7996a778 | 987 | |
77a23c21 | 988 | spin_lock_bh(&conn->session->lock); |
7996a778 MC |
989 | if (unlikely(conn->suspend_tx)) { |
990 | debug_scsi("conn %d Tx suspended!\n", conn->id); | |
77a23c21 | 991 | spin_unlock_bh(&conn->session->lock); |
3219e529 | 992 | return -ENODATA; |
7996a778 | 993 | } |
7996a778 MC |
994 | |
995 | if (conn->ctask) { | |
77a23c21 | 996 | rc = iscsi_xmit_ctask(conn); |
3219e529 | 997 | if (rc) |
7996a778 | 998 | goto again; |
7996a778 | 999 | } |
77a23c21 | 1000 | |
7996a778 | 1001 | if (conn->mtask) { |
05db888a | 1002 | rc = iscsi_xmit_mtask(conn); |
3219e529 | 1003 | if (rc) |
7996a778 | 1004 | goto again; |
7996a778 MC |
1005 | } |
1006 | ||
77a23c21 MC |
1007 | /* |
1008 | * process mgmt pdus like nops before commands since we should | |
1009 | * only have one nop-out as a ping from us and targets should not | |
1010 | * overflow us with nop-ins | |
1011 | */ | |
1012 | check_mgmt: | |
843c0a8a MC |
1013 | while (!list_empty(&conn->mgmtqueue)) { |
1014 | conn->mtask = list_entry(conn->mgmtqueue.next, | |
1015 | struct iscsi_mgmt_task, running); | |
b3a7ea8d MC |
1016 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) { |
1017 | iscsi_free_mgmt_task(conn, conn->mtask); | |
1018 | conn->mtask = NULL; | |
1019 | continue; | |
1020 | } | |
1021 | ||
77a23c21 | 1022 | iscsi_prep_mtask(conn, conn->mtask); |
843c0a8a | 1023 | list_move_tail(conn->mgmtqueue.next, &conn->mgmt_run_list); |
77a23c21 MC |
1024 | rc = iscsi_xmit_mtask(conn); |
1025 | if (rc) | |
1026 | goto again; | |
7996a778 MC |
1027 | } |
1028 | ||
843c0a8a | 1029 | /* process pending command queue */ |
b6c395ed | 1030 | while (!list_empty(&conn->xmitqueue)) { |
843c0a8a MC |
1031 | if (conn->tmf_state == TMF_QUEUED) |
1032 | break; | |
1033 | ||
b6c395ed MC |
1034 | conn->ctask = list_entry(conn->xmitqueue.next, |
1035 | struct iscsi_cmd_task, running); | |
b3a7ea8d | 1036 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) { |
9000bcd6 | 1037 | fail_command(conn, conn->ctask, DID_IMM_RETRY << 16); |
b3a7ea8d MC |
1038 | continue; |
1039 | } | |
004d6530 BH |
1040 | if (iscsi_prep_scsi_cmd_pdu(conn->ctask)) { |
1041 | fail_command(conn, conn->ctask, DID_ABORT << 16); | |
1042 | continue; | |
1043 | } | |
a8ac6311 | 1044 | |
843c0a8a | 1045 | conn->ctask->state = ISCSI_TASK_RUNNING; |
b6c395ed | 1046 | list_move_tail(conn->xmitqueue.next, &conn->run_list); |
77a23c21 MC |
1047 | rc = iscsi_xmit_ctask(conn); |
1048 | if (rc) | |
60ecebf5 | 1049 | goto again; |
77a23c21 MC |
1050 | /* |
1051 | * we could continuously get new ctask requests so | |
1052 | * we need to check the mgmt queue for nops that need to | |
1053 | * be sent to aviod starvation | |
1054 | */ | |
843c0a8a MC |
1055 | if (!list_empty(&conn->mgmtqueue)) |
1056 | goto check_mgmt; | |
1057 | } | |
1058 | ||
1059 | while (!list_empty(&conn->requeue)) { | |
1060 | if (conn->session->fast_abort && conn->tmf_state != TMF_INITIAL) | |
1061 | break; | |
1062 | ||
b3a7ea8d MC |
1063 | /* |
1064 | * we always do fastlogout - conn stop code will clean up. | |
1065 | */ | |
1066 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) | |
1067 | break; | |
1068 | ||
843c0a8a MC |
1069 | conn->ctask = list_entry(conn->requeue.next, |
1070 | struct iscsi_cmd_task, running); | |
1071 | conn->ctask->state = ISCSI_TASK_RUNNING; | |
1072 | list_move_tail(conn->requeue.next, &conn->run_list); | |
1073 | rc = iscsi_xmit_ctask(conn); | |
1074 | if (rc) | |
1075 | goto again; | |
1076 | if (!list_empty(&conn->mgmtqueue)) | |
77a23c21 | 1077 | goto check_mgmt; |
7996a778 | 1078 | } |
b6c395ed | 1079 | spin_unlock_bh(&conn->session->lock); |
3219e529 | 1080 | return -ENODATA; |
7996a778 MC |
1081 | |
1082 | again: | |
1083 | if (unlikely(conn->suspend_tx)) | |
77a23c21 MC |
1084 | rc = -ENODATA; |
1085 | spin_unlock_bh(&conn->session->lock); | |
3219e529 | 1086 | return rc; |
7996a778 MC |
1087 | } |
1088 | ||
c4028958 | 1089 | static void iscsi_xmitworker(struct work_struct *work) |
7996a778 | 1090 | { |
c4028958 DH |
1091 | struct iscsi_conn *conn = |
1092 | container_of(work, struct iscsi_conn, xmitwork); | |
3219e529 | 1093 | int rc; |
7996a778 MC |
1094 | /* |
1095 | * serialize Xmit worker on a per-connection basis. | |
1096 | */ | |
3219e529 MC |
1097 | do { |
1098 | rc = iscsi_data_xmit(conn); | |
1099 | } while (rc >= 0 || rc == -EAGAIN); | |
7996a778 MC |
1100 | } |
1101 | ||
1102 | enum { | |
1103 | FAILURE_BAD_HOST = 1, | |
1104 | FAILURE_SESSION_FAILED, | |
1105 | FAILURE_SESSION_FREED, | |
1106 | FAILURE_WINDOW_CLOSED, | |
60ecebf5 | 1107 | FAILURE_OOM, |
7996a778 | 1108 | FAILURE_SESSION_TERMINATE, |
656cffc9 | 1109 | FAILURE_SESSION_IN_RECOVERY, |
7996a778 | 1110 | FAILURE_SESSION_RECOVERY_TIMEOUT, |
b3a7ea8d | 1111 | FAILURE_SESSION_LOGGING_OUT, |
6eabafbe | 1112 | FAILURE_SESSION_NOT_READY, |
7996a778 MC |
1113 | }; |
1114 | ||
1115 | int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *)) | |
1116 | { | |
75613521 | 1117 | struct iscsi_cls_session *cls_session; |
7996a778 MC |
1118 | struct Scsi_Host *host; |
1119 | int reason = 0; | |
1120 | struct iscsi_session *session; | |
1121 | struct iscsi_conn *conn; | |
1122 | struct iscsi_cmd_task *ctask = NULL; | |
1123 | ||
1124 | sc->scsi_done = done; | |
1125 | sc->result = 0; | |
f47f2cf5 | 1126 | sc->SCp.ptr = NULL; |
7996a778 MC |
1127 | |
1128 | host = sc->device->host; | |
1040c99d | 1129 | spin_unlock(host->host_lock); |
7996a778 | 1130 | |
75613521 MC |
1131 | cls_session = starget_to_session(scsi_target(sc->device)); |
1132 | session = cls_session->dd_data; | |
7996a778 MC |
1133 | spin_lock(&session->lock); |
1134 | ||
75613521 | 1135 | reason = iscsi_session_chkready(cls_session); |
6eabafbe MC |
1136 | if (reason) { |
1137 | sc->result = reason; | |
1138 | goto fault; | |
1139 | } | |
1140 | ||
656cffc9 MC |
1141 | /* |
1142 | * ISCSI_STATE_FAILED is a temp. state. The recovery | |
1143 | * code will decide what is best to do with command queued | |
1144 | * during this time | |
1145 | */ | |
1146 | if (session->state != ISCSI_STATE_LOGGED_IN && | |
1147 | session->state != ISCSI_STATE_FAILED) { | |
1148 | /* | |
1149 | * to handle the race between when we set the recovery state | |
1150 | * and block the session we requeue here (commands could | |
1151 | * be entering our queuecommand while a block is starting | |
1152 | * up because the block code is not locked) | |
1153 | */ | |
9000bcd6 MC |
1154 | switch (session->state) { |
1155 | case ISCSI_STATE_IN_RECOVERY: | |
656cffc9 | 1156 | reason = FAILURE_SESSION_IN_RECOVERY; |
6eabafbe MC |
1157 | sc->result = DID_IMM_RETRY << 16; |
1158 | break; | |
9000bcd6 MC |
1159 | case ISCSI_STATE_LOGGING_OUT: |
1160 | reason = FAILURE_SESSION_LOGGING_OUT; | |
6eabafbe MC |
1161 | sc->result = DID_IMM_RETRY << 16; |
1162 | break; | |
b3a7ea8d | 1163 | case ISCSI_STATE_RECOVERY_FAILED: |
656cffc9 | 1164 | reason = FAILURE_SESSION_RECOVERY_TIMEOUT; |
6eabafbe | 1165 | sc->result = DID_NO_CONNECT << 16; |
b3a7ea8d MC |
1166 | break; |
1167 | case ISCSI_STATE_TERMINATE: | |
656cffc9 | 1168 | reason = FAILURE_SESSION_TERMINATE; |
6eabafbe | 1169 | sc->result = DID_NO_CONNECT << 16; |
b3a7ea8d | 1170 | break; |
b3a7ea8d | 1171 | default: |
656cffc9 | 1172 | reason = FAILURE_SESSION_FREED; |
6eabafbe | 1173 | sc->result = DID_NO_CONNECT << 16; |
b3a7ea8d | 1174 | } |
7996a778 MC |
1175 | goto fault; |
1176 | } | |
1177 | ||
7996a778 | 1178 | conn = session->leadconn; |
98644047 MC |
1179 | if (!conn) { |
1180 | reason = FAILURE_SESSION_FREED; | |
6eabafbe | 1181 | sc->result = DID_NO_CONNECT << 16; |
98644047 MC |
1182 | goto fault; |
1183 | } | |
7996a778 | 1184 | |
77a23c21 MC |
1185 | if (iscsi_check_cmdsn_window_closed(conn)) { |
1186 | reason = FAILURE_WINDOW_CLOSED; | |
1187 | goto reject; | |
1188 | } | |
1189 | ||
60ecebf5 MC |
1190 | if (!__kfifo_get(session->cmdpool.queue, (void*)&ctask, |
1191 | sizeof(void*))) { | |
1192 | reason = FAILURE_OOM; | |
1193 | goto reject; | |
1194 | } | |
e0726407 MC |
1195 | session->queued_cmdsn++; |
1196 | ||
7996a778 MC |
1197 | sc->SCp.phase = session->age; |
1198 | sc->SCp.ptr = (char *)ctask; | |
1199 | ||
60ecebf5 | 1200 | atomic_set(&ctask->refcount, 1); |
b6c395ed | 1201 | ctask->state = ISCSI_TASK_PENDING; |
7996a778 MC |
1202 | ctask->conn = conn; |
1203 | ctask->sc = sc; | |
1204 | INIT_LIST_HEAD(&ctask->running); | |
7996a778 | 1205 | |
b6c395ed | 1206 | list_add_tail(&ctask->running, &conn->xmitqueue); |
7996a778 MC |
1207 | spin_unlock(&session->lock); |
1208 | ||
1209 | scsi_queue_work(host, &conn->xmitwork); | |
1040c99d | 1210 | spin_lock(host->host_lock); |
7996a778 MC |
1211 | return 0; |
1212 | ||
1213 | reject: | |
1214 | spin_unlock(&session->lock); | |
1215 | debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason); | |
1040c99d | 1216 | spin_lock(host->host_lock); |
7996a778 MC |
1217 | return SCSI_MLQUEUE_HOST_BUSY; |
1218 | ||
1219 | fault: | |
1220 | spin_unlock(&session->lock); | |
6eabafbe | 1221 | debug_scsi("iscsi: cmd 0x%x is not queued (%d)\n", sc->cmnd[0], reason); |
c07d4444 BH |
1222 | if (!scsi_bidi_cmnd(sc)) |
1223 | scsi_set_resid(sc, scsi_bufflen(sc)); | |
1224 | else { | |
1225 | scsi_out(sc)->resid = scsi_out(sc)->length; | |
1226 | scsi_in(sc)->resid = scsi_in(sc)->length; | |
1227 | } | |
7996a778 | 1228 | sc->scsi_done(sc); |
1040c99d | 1229 | spin_lock(host->host_lock); |
7996a778 MC |
1230 | return 0; |
1231 | } | |
1232 | EXPORT_SYMBOL_GPL(iscsi_queuecommand); | |
1233 | ||
1234 | int iscsi_change_queue_depth(struct scsi_device *sdev, int depth) | |
1235 | { | |
1236 | if (depth > ISCSI_MAX_CMD_PER_LUN) | |
1237 | depth = ISCSI_MAX_CMD_PER_LUN; | |
1238 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); | |
1239 | return sdev->queue_depth; | |
1240 | } | |
1241 | EXPORT_SYMBOL_GPL(iscsi_change_queue_depth); | |
1242 | ||
7996a778 MC |
1243 | void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session) |
1244 | { | |
75613521 | 1245 | struct iscsi_session *session = cls_session->dd_data; |
7996a778 MC |
1246 | |
1247 | spin_lock_bh(&session->lock); | |
1248 | if (session->state != ISCSI_STATE_LOGGED_IN) { | |
656cffc9 | 1249 | session->state = ISCSI_STATE_RECOVERY_FAILED; |
843c0a8a MC |
1250 | if (session->leadconn) |
1251 | wake_up(&session->leadconn->ehwait); | |
7996a778 MC |
1252 | } |
1253 | spin_unlock_bh(&session->lock); | |
1254 | } | |
1255 | EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout); | |
1256 | ||
1257 | int iscsi_eh_host_reset(struct scsi_cmnd *sc) | |
1258 | { | |
75613521 MC |
1259 | struct iscsi_cls_session *cls_session; |
1260 | struct iscsi_session *session; | |
1261 | struct iscsi_conn *conn; | |
1262 | ||
1263 | cls_session = starget_to_session(scsi_target(sc->device)); | |
1264 | session = cls_session->dd_data; | |
1265 | conn = session->leadconn; | |
7996a778 | 1266 | |
bc436b27 | 1267 | mutex_lock(&session->eh_mutex); |
7996a778 MC |
1268 | spin_lock_bh(&session->lock); |
1269 | if (session->state == ISCSI_STATE_TERMINATE) { | |
1270 | failed: | |
1271 | debug_scsi("failing host reset: session terminated " | |
d6e24d1c | 1272 | "[CID %d age %d]\n", conn->id, session->age); |
7996a778 | 1273 | spin_unlock_bh(&session->lock); |
bc436b27 | 1274 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1275 | return FAILED; |
1276 | } | |
1277 | ||
7996a778 | 1278 | spin_unlock_bh(&session->lock); |
bc436b27 | 1279 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1280 | /* |
1281 | * we drop the lock here but the leadconn cannot be destoyed while | |
1282 | * we are in the scsi eh | |
1283 | */ | |
843c0a8a | 1284 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
7996a778 MC |
1285 | |
1286 | debug_scsi("iscsi_eh_host_reset wait for relogin\n"); | |
1287 | wait_event_interruptible(conn->ehwait, | |
1288 | session->state == ISCSI_STATE_TERMINATE || | |
1289 | session->state == ISCSI_STATE_LOGGED_IN || | |
656cffc9 | 1290 | session->state == ISCSI_STATE_RECOVERY_FAILED); |
7996a778 MC |
1291 | if (signal_pending(current)) |
1292 | flush_signals(current); | |
1293 | ||
bc436b27 | 1294 | mutex_lock(&session->eh_mutex); |
7996a778 MC |
1295 | spin_lock_bh(&session->lock); |
1296 | if (session->state == ISCSI_STATE_LOGGED_IN) | |
322d739d MC |
1297 | iscsi_session_printk(KERN_INFO, session, |
1298 | "host reset succeeded\n"); | |
7996a778 MC |
1299 | else |
1300 | goto failed; | |
1301 | spin_unlock_bh(&session->lock); | |
bc436b27 | 1302 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1303 | return SUCCESS; |
1304 | } | |
1305 | EXPORT_SYMBOL_GPL(iscsi_eh_host_reset); | |
1306 | ||
843c0a8a | 1307 | static void iscsi_tmf_timedout(unsigned long data) |
7996a778 | 1308 | { |
843c0a8a | 1309 | struct iscsi_conn *conn = (struct iscsi_conn *)data; |
7996a778 MC |
1310 | struct iscsi_session *session = conn->session; |
1311 | ||
1312 | spin_lock(&session->lock); | |
843c0a8a MC |
1313 | if (conn->tmf_state == TMF_QUEUED) { |
1314 | conn->tmf_state = TMF_TIMEDOUT; | |
1315 | debug_scsi("tmf timedout\n"); | |
7996a778 MC |
1316 | /* unblock eh_abort() */ |
1317 | wake_up(&conn->ehwait); | |
1318 | } | |
1319 | spin_unlock(&session->lock); | |
1320 | } | |
1321 | ||
843c0a8a | 1322 | static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn, |
f6d5180c MC |
1323 | struct iscsi_tm *hdr, int age, |
1324 | int timeout) | |
7996a778 | 1325 | { |
7996a778 | 1326 | struct iscsi_session *session = conn->session; |
843c0a8a | 1327 | struct iscsi_mgmt_task *mtask; |
7996a778 | 1328 | |
843c0a8a MC |
1329 | mtask = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr, |
1330 | NULL, 0); | |
1331 | if (!mtask) { | |
6724add1 | 1332 | spin_unlock_bh(&session->lock); |
7996a778 | 1333 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
843c0a8a MC |
1334 | spin_lock_bh(&session->lock); |
1335 | debug_scsi("tmf exec failure\n"); | |
77a23c21 | 1336 | return -EPERM; |
7996a778 | 1337 | } |
843c0a8a | 1338 | conn->tmfcmd_pdus_cnt++; |
f6d5180c | 1339 | conn->tmf_timer.expires = timeout * HZ + jiffies; |
843c0a8a MC |
1340 | conn->tmf_timer.function = iscsi_tmf_timedout; |
1341 | conn->tmf_timer.data = (unsigned long)conn; | |
1342 | add_timer(&conn->tmf_timer); | |
1343 | debug_scsi("tmf set timeout\n"); | |
7996a778 | 1344 | |
7996a778 | 1345 | spin_unlock_bh(&session->lock); |
6724add1 | 1346 | mutex_unlock(&session->eh_mutex); |
77a23c21 | 1347 | scsi_queue_work(session->host, &conn->xmitwork); |
7996a778 MC |
1348 | |
1349 | /* | |
1350 | * block eh thread until: | |
1351 | * | |
843c0a8a MC |
1352 | * 1) tmf response |
1353 | * 2) tmf timeout | |
7996a778 MC |
1354 | * 3) session is terminated or restarted or userspace has |
1355 | * given up on recovery | |
1356 | */ | |
843c0a8a | 1357 | wait_event_interruptible(conn->ehwait, age != session->age || |
7996a778 | 1358 | session->state != ISCSI_STATE_LOGGED_IN || |
843c0a8a | 1359 | conn->tmf_state != TMF_QUEUED); |
7996a778 MC |
1360 | if (signal_pending(current)) |
1361 | flush_signals(current); | |
843c0a8a MC |
1362 | del_timer_sync(&conn->tmf_timer); |
1363 | ||
6724add1 | 1364 | mutex_lock(&session->eh_mutex); |
77a23c21 | 1365 | spin_lock_bh(&session->lock); |
843c0a8a MC |
1366 | /* if the session drops it will clean up the mtask */ |
1367 | if (age != session->age || | |
1368 | session->state != ISCSI_STATE_LOGGED_IN) | |
1369 | return -ENOTCONN; | |
7996a778 MC |
1370 | return 0; |
1371 | } | |
1372 | ||
843c0a8a MC |
1373 | /* |
1374 | * Fail commands. session lock held and recv side suspended and xmit | |
1375 | * thread flushed | |
1376 | */ | |
6eabafbe MC |
1377 | static void fail_all_commands(struct iscsi_conn *conn, unsigned lun, |
1378 | int error) | |
843c0a8a MC |
1379 | { |
1380 | struct iscsi_cmd_task *ctask, *tmp; | |
1381 | ||
1382 | if (conn->ctask && (conn->ctask->sc->device->lun == lun || lun == -1)) | |
1383 | conn->ctask = NULL; | |
1384 | ||
1385 | /* flush pending */ | |
1386 | list_for_each_entry_safe(ctask, tmp, &conn->xmitqueue, running) { | |
1387 | if (lun == ctask->sc->device->lun || lun == -1) { | |
1388 | debug_scsi("failing pending sc %p itt 0x%x\n", | |
1389 | ctask->sc, ctask->itt); | |
6eabafbe | 1390 | fail_command(conn, ctask, error << 16); |
843c0a8a MC |
1391 | } |
1392 | } | |
1393 | ||
1394 | list_for_each_entry_safe(ctask, tmp, &conn->requeue, running) { | |
1395 | if (lun == ctask->sc->device->lun || lun == -1) { | |
1396 | debug_scsi("failing requeued sc %p itt 0x%x\n", | |
1397 | ctask->sc, ctask->itt); | |
6eabafbe | 1398 | fail_command(conn, ctask, error << 16); |
843c0a8a MC |
1399 | } |
1400 | } | |
1401 | ||
1402 | /* fail all other running */ | |
1403 | list_for_each_entry_safe(ctask, tmp, &conn->run_list, running) { | |
1404 | if (lun == ctask->sc->device->lun || lun == -1) { | |
1405 | debug_scsi("failing in progress sc %p itt 0x%x\n", | |
1406 | ctask->sc, ctask->itt); | |
1407 | fail_command(conn, ctask, DID_BUS_BUSY << 16); | |
1408 | } | |
1409 | } | |
1410 | } | |
1411 | ||
b40977d9 | 1412 | void iscsi_suspend_tx(struct iscsi_conn *conn) |
6724add1 MC |
1413 | { |
1414 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
1415 | scsi_flush_work(conn->session->host); | |
1416 | } | |
b40977d9 | 1417 | EXPORT_SYMBOL_GPL(iscsi_suspend_tx); |
6724add1 MC |
1418 | |
1419 | static void iscsi_start_tx(struct iscsi_conn *conn) | |
1420 | { | |
1421 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
1422 | scsi_queue_work(conn->session->host, &conn->xmitwork); | |
1423 | } | |
1424 | ||
f6d5180c MC |
1425 | static enum scsi_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *scmd) |
1426 | { | |
1427 | struct iscsi_cls_session *cls_session; | |
1428 | struct iscsi_session *session; | |
1429 | struct iscsi_conn *conn; | |
1430 | enum scsi_eh_timer_return rc = EH_NOT_HANDLED; | |
1431 | ||
1432 | cls_session = starget_to_session(scsi_target(scmd->device)); | |
75613521 | 1433 | session = cls_session->dd_data; |
f6d5180c MC |
1434 | |
1435 | debug_scsi("scsi cmd %p timedout\n", scmd); | |
1436 | ||
1437 | spin_lock(&session->lock); | |
1438 | if (session->state != ISCSI_STATE_LOGGED_IN) { | |
1439 | /* | |
1440 | * We are probably in the middle of iscsi recovery so let | |
1441 | * that complete and handle the error. | |
1442 | */ | |
1443 | rc = EH_RESET_TIMER; | |
1444 | goto done; | |
1445 | } | |
1446 | ||
1447 | conn = session->leadconn; | |
1448 | if (!conn) { | |
1449 | /* In the middle of shuting down */ | |
1450 | rc = EH_RESET_TIMER; | |
1451 | goto done; | |
1452 | } | |
1453 | ||
1454 | if (!conn->recv_timeout && !conn->ping_timeout) | |
1455 | goto done; | |
1456 | /* | |
1457 | * if the ping timedout then we are in the middle of cleaning up | |
1458 | * and can let the iscsi eh handle it | |
1459 | */ | |
1460 | if (time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) + | |
1461 | (conn->ping_timeout * HZ), jiffies)) | |
1462 | rc = EH_RESET_TIMER; | |
1463 | /* | |
1464 | * if we are about to check the transport then give the command | |
1465 | * more time | |
1466 | */ | |
1467 | if (time_before_eq(conn->last_recv + (conn->recv_timeout * HZ), | |
1468 | jiffies)) | |
1469 | rc = EH_RESET_TIMER; | |
1470 | /* if in the middle of checking the transport then give us more time */ | |
1471 | if (conn->ping_mtask) | |
1472 | rc = EH_RESET_TIMER; | |
1473 | done: | |
1474 | spin_unlock(&session->lock); | |
1475 | debug_scsi("return %s\n", rc == EH_RESET_TIMER ? "timer reset" : "nh"); | |
1476 | return rc; | |
1477 | } | |
1478 | ||
1479 | static void iscsi_check_transport_timeouts(unsigned long data) | |
1480 | { | |
1481 | struct iscsi_conn *conn = (struct iscsi_conn *)data; | |
1482 | struct iscsi_session *session = conn->session; | |
4cf10435 | 1483 | unsigned long recv_timeout, next_timeout = 0, last_recv; |
f6d5180c MC |
1484 | |
1485 | spin_lock(&session->lock); | |
1486 | if (session->state != ISCSI_STATE_LOGGED_IN) | |
1487 | goto done; | |
1488 | ||
4cf10435 MC |
1489 | recv_timeout = conn->recv_timeout; |
1490 | if (!recv_timeout) | |
f6d5180c MC |
1491 | goto done; |
1492 | ||
4cf10435 | 1493 | recv_timeout *= HZ; |
f6d5180c | 1494 | last_recv = conn->last_recv; |
4cf10435 MC |
1495 | if (conn->ping_mtask && |
1496 | time_before_eq(conn->last_ping + (conn->ping_timeout * HZ), | |
f6d5180c | 1497 | jiffies)) { |
322d739d MC |
1498 | iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs " |
1499 | "expired, last rx %lu, last ping %lu, " | |
1500 | "now %lu\n", conn->ping_timeout, last_recv, | |
1501 | conn->last_ping, jiffies); | |
f6d5180c MC |
1502 | spin_unlock(&session->lock); |
1503 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1504 | return; | |
1505 | } | |
1506 | ||
4cf10435 | 1507 | if (time_before_eq(last_recv + recv_timeout, jiffies)) { |
c8611f97 MC |
1508 | /* send a ping to try to provoke some traffic */ |
1509 | debug_scsi("Sending nopout as ping on conn %p\n", conn); | |
1510 | iscsi_send_nopout(conn, NULL); | |
4cf10435 | 1511 | next_timeout = conn->last_ping + (conn->ping_timeout * HZ); |
ad294e9c | 1512 | } else |
4cf10435 | 1513 | next_timeout = last_recv + recv_timeout; |
f6d5180c | 1514 | |
ad294e9c MC |
1515 | debug_scsi("Setting next tmo %lu\n", next_timeout); |
1516 | mod_timer(&conn->transport_timer, next_timeout); | |
f6d5180c MC |
1517 | done: |
1518 | spin_unlock(&session->lock); | |
1519 | } | |
1520 | ||
843c0a8a MC |
1521 | static void iscsi_prep_abort_task_pdu(struct iscsi_cmd_task *ctask, |
1522 | struct iscsi_tm *hdr) | |
1523 | { | |
1524 | memset(hdr, 0, sizeof(*hdr)); | |
1525 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
1526 | hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK; | |
1527 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
1528 | memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); | |
1529 | hdr->rtt = ctask->hdr->itt; | |
1530 | hdr->refcmdsn = ctask->hdr->cmdsn; | |
1531 | } | |
1532 | ||
7996a778 MC |
1533 | int iscsi_eh_abort(struct scsi_cmnd *sc) |
1534 | { | |
75613521 MC |
1535 | struct iscsi_cls_session *cls_session; |
1536 | struct iscsi_session *session; | |
f47f2cf5 | 1537 | struct iscsi_conn *conn; |
843c0a8a MC |
1538 | struct iscsi_cmd_task *ctask; |
1539 | struct iscsi_tm *hdr; | |
1540 | int rc, age; | |
7996a778 | 1541 | |
75613521 MC |
1542 | cls_session = starget_to_session(scsi_target(sc->device)); |
1543 | session = cls_session->dd_data; | |
1544 | ||
6724add1 MC |
1545 | mutex_lock(&session->eh_mutex); |
1546 | spin_lock_bh(&session->lock); | |
f47f2cf5 MC |
1547 | /* |
1548 | * if session was ISCSI_STATE_IN_RECOVERY then we may not have | |
1549 | * got the command. | |
1550 | */ | |
1551 | if (!sc->SCp.ptr) { | |
1552 | debug_scsi("sc never reached iscsi layer or it completed.\n"); | |
6724add1 MC |
1553 | spin_unlock_bh(&session->lock); |
1554 | mutex_unlock(&session->eh_mutex); | |
f47f2cf5 MC |
1555 | return SUCCESS; |
1556 | } | |
1557 | ||
7996a778 MC |
1558 | /* |
1559 | * If we are not logged in or we have started a new session | |
1560 | * then let the host reset code handle this | |
1561 | */ | |
843c0a8a MC |
1562 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN || |
1563 | sc->SCp.phase != session->age) { | |
1564 | spin_unlock_bh(&session->lock); | |
1565 | mutex_unlock(&session->eh_mutex); | |
1566 | return FAILED; | |
1567 | } | |
1568 | ||
1569 | conn = session->leadconn; | |
1570 | conn->eh_abort_cnt++; | |
1571 | age = session->age; | |
1572 | ||
1573 | ctask = (struct iscsi_cmd_task *)sc->SCp.ptr; | |
1574 | debug_scsi("aborting [sc %p itt 0x%x]\n", sc, ctask->itt); | |
7996a778 MC |
1575 | |
1576 | /* ctask completed before time out */ | |
7ea8b828 | 1577 | if (!ctask->sc) { |
7ea8b828 | 1578 | debug_scsi("sc completed while abort in progress\n"); |
77a23c21 | 1579 | goto success; |
7ea8b828 | 1580 | } |
7996a778 | 1581 | |
77a23c21 MC |
1582 | if (ctask->state == ISCSI_TASK_PENDING) { |
1583 | fail_command(conn, ctask, DID_ABORT << 16); | |
1584 | goto success; | |
1585 | } | |
7996a778 | 1586 | |
843c0a8a MC |
1587 | /* only have one tmf outstanding at a time */ |
1588 | if (conn->tmf_state != TMF_INITIAL) | |
7996a778 | 1589 | goto failed; |
843c0a8a | 1590 | conn->tmf_state = TMF_QUEUED; |
7996a778 | 1591 | |
843c0a8a MC |
1592 | hdr = &conn->tmhdr; |
1593 | iscsi_prep_abort_task_pdu(ctask, hdr); | |
1594 | ||
f6d5180c | 1595 | if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout)) { |
843c0a8a MC |
1596 | rc = FAILED; |
1597 | goto failed; | |
1598 | } | |
1599 | ||
1600 | switch (conn->tmf_state) { | |
1601 | case TMF_SUCCESS: | |
77a23c21 | 1602 | spin_unlock_bh(&session->lock); |
6724add1 | 1603 | iscsi_suspend_tx(conn); |
77a23c21 MC |
1604 | /* |
1605 | * clean up task if aborted. grab the recv lock as a writer | |
1606 | */ | |
1607 | write_lock_bh(conn->recv_lock); | |
1608 | spin_lock(&session->lock); | |
1609 | fail_command(conn, ctask, DID_ABORT << 16); | |
843c0a8a | 1610 | conn->tmf_state = TMF_INITIAL; |
77a23c21 MC |
1611 | spin_unlock(&session->lock); |
1612 | write_unlock_bh(conn->recv_lock); | |
6724add1 | 1613 | iscsi_start_tx(conn); |
77a23c21 | 1614 | goto success_unlocked; |
843c0a8a MC |
1615 | case TMF_TIMEDOUT: |
1616 | spin_unlock_bh(&session->lock); | |
1617 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1618 | goto failed_unlocked; | |
1619 | case TMF_NOT_FOUND: | |
1620 | if (!sc->SCp.ptr) { | |
1621 | conn->tmf_state = TMF_INITIAL; | |
7ea8b828 | 1622 | /* ctask completed before tmf abort response */ |
7ea8b828 | 1623 | debug_scsi("sc completed while abort in progress\n"); |
77a23c21 | 1624 | goto success; |
7ea8b828 MC |
1625 | } |
1626 | /* fall through */ | |
1627 | default: | |
843c0a8a MC |
1628 | conn->tmf_state = TMF_INITIAL; |
1629 | goto failed; | |
7996a778 MC |
1630 | } |
1631 | ||
77a23c21 | 1632 | success: |
7996a778 | 1633 | spin_unlock_bh(&session->lock); |
77a23c21 MC |
1634 | success_unlocked: |
1635 | debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, ctask->itt); | |
6724add1 | 1636 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1637 | return SUCCESS; |
1638 | ||
1639 | failed: | |
1640 | spin_unlock_bh(&session->lock); | |
77a23c21 | 1641 | failed_unlocked: |
843c0a8a MC |
1642 | debug_scsi("abort failed [sc %p itt 0x%x]\n", sc, |
1643 | ctask ? ctask->itt : 0); | |
6724add1 | 1644 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1645 | return FAILED; |
1646 | } | |
1647 | EXPORT_SYMBOL_GPL(iscsi_eh_abort); | |
1648 | ||
843c0a8a MC |
1649 | static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr) |
1650 | { | |
1651 | memset(hdr, 0, sizeof(*hdr)); | |
1652 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
1653 | hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK; | |
1654 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
1655 | int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun); | |
f6d5180c | 1656 | hdr->rtt = RESERVED_ITT; |
843c0a8a MC |
1657 | } |
1658 | ||
1659 | int iscsi_eh_device_reset(struct scsi_cmnd *sc) | |
1660 | { | |
75613521 MC |
1661 | struct iscsi_cls_session *cls_session; |
1662 | struct iscsi_session *session; | |
843c0a8a MC |
1663 | struct iscsi_conn *conn; |
1664 | struct iscsi_tm *hdr; | |
1665 | int rc = FAILED; | |
1666 | ||
75613521 MC |
1667 | cls_session = starget_to_session(scsi_target(sc->device)); |
1668 | session = cls_session->dd_data; | |
1669 | ||
843c0a8a MC |
1670 | debug_scsi("LU Reset [sc %p lun %u]\n", sc, sc->device->lun); |
1671 | ||
1672 | mutex_lock(&session->eh_mutex); | |
1673 | spin_lock_bh(&session->lock); | |
1674 | /* | |
1675 | * Just check if we are not logged in. We cannot check for | |
1676 | * the phase because the reset could come from a ioctl. | |
1677 | */ | |
1678 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN) | |
1679 | goto unlock; | |
1680 | conn = session->leadconn; | |
1681 | ||
1682 | /* only have one tmf outstanding at a time */ | |
1683 | if (conn->tmf_state != TMF_INITIAL) | |
1684 | goto unlock; | |
1685 | conn->tmf_state = TMF_QUEUED; | |
1686 | ||
1687 | hdr = &conn->tmhdr; | |
1688 | iscsi_prep_lun_reset_pdu(sc, hdr); | |
1689 | ||
f6d5180c MC |
1690 | if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age, |
1691 | session->lu_reset_timeout)) { | |
843c0a8a MC |
1692 | rc = FAILED; |
1693 | goto unlock; | |
1694 | } | |
1695 | ||
1696 | switch (conn->tmf_state) { | |
1697 | case TMF_SUCCESS: | |
1698 | break; | |
1699 | case TMF_TIMEDOUT: | |
1700 | spin_unlock_bh(&session->lock); | |
1701 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1702 | goto done; | |
1703 | default: | |
1704 | conn->tmf_state = TMF_INITIAL; | |
1705 | goto unlock; | |
1706 | } | |
1707 | ||
1708 | rc = SUCCESS; | |
1709 | spin_unlock_bh(&session->lock); | |
1710 | ||
1711 | iscsi_suspend_tx(conn); | |
1712 | /* need to grab the recv lock then session lock */ | |
1713 | write_lock_bh(conn->recv_lock); | |
1714 | spin_lock(&session->lock); | |
6eabafbe | 1715 | fail_all_commands(conn, sc->device->lun, DID_ERROR); |
843c0a8a MC |
1716 | conn->tmf_state = TMF_INITIAL; |
1717 | spin_unlock(&session->lock); | |
1718 | write_unlock_bh(conn->recv_lock); | |
1719 | ||
1720 | iscsi_start_tx(conn); | |
1721 | goto done; | |
1722 | ||
1723 | unlock: | |
1724 | spin_unlock_bh(&session->lock); | |
1725 | done: | |
1726 | debug_scsi("iscsi_eh_device_reset %s\n", | |
1727 | rc == SUCCESS ? "SUCCESS" : "FAILED"); | |
1728 | mutex_unlock(&session->eh_mutex); | |
1729 | return rc; | |
1730 | } | |
1731 | EXPORT_SYMBOL_GPL(iscsi_eh_device_reset); | |
1732 | ||
6320377f OK |
1733 | /* |
1734 | * Pre-allocate a pool of @max items of @item_size. By default, the pool | |
1735 | * should be accessed via kfifo_{get,put} on q->queue. | |
1736 | * Optionally, the caller can obtain the array of object pointers | |
1737 | * by passing in a non-NULL @items pointer | |
1738 | */ | |
7996a778 | 1739 | int |
6320377f | 1740 | iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size) |
7996a778 | 1741 | { |
6320377f | 1742 | int i, num_arrays = 1; |
7996a778 | 1743 | |
6320377f | 1744 | memset(q, 0, sizeof(*q)); |
7996a778 MC |
1745 | |
1746 | q->max = max; | |
6320377f OK |
1747 | |
1748 | /* If the user passed an items pointer, he wants a copy of | |
1749 | * the array. */ | |
1750 | if (items) | |
1751 | num_arrays++; | |
1752 | q->pool = kzalloc(num_arrays * max * sizeof(void*), GFP_KERNEL); | |
1753 | if (q->pool == NULL) | |
1754 | goto enomem; | |
7996a778 MC |
1755 | |
1756 | q->queue = kfifo_init((void*)q->pool, max * sizeof(void*), | |
1757 | GFP_KERNEL, NULL); | |
6320377f OK |
1758 | if (q->queue == ERR_PTR(-ENOMEM)) |
1759 | goto enomem; | |
7996a778 MC |
1760 | |
1761 | for (i = 0; i < max; i++) { | |
6320377f | 1762 | q->pool[i] = kzalloc(item_size, GFP_KERNEL); |
7996a778 | 1763 | if (q->pool[i] == NULL) { |
6320377f OK |
1764 | q->max = i; |
1765 | goto enomem; | |
7996a778 | 1766 | } |
7996a778 MC |
1767 | __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*)); |
1768 | } | |
6320377f OK |
1769 | |
1770 | if (items) { | |
1771 | *items = q->pool + max; | |
1772 | memcpy(*items, q->pool, max * sizeof(void *)); | |
1773 | } | |
1774 | ||
7996a778 | 1775 | return 0; |
6320377f OK |
1776 | |
1777 | enomem: | |
1778 | iscsi_pool_free(q); | |
1779 | return -ENOMEM; | |
7996a778 MC |
1780 | } |
1781 | EXPORT_SYMBOL_GPL(iscsi_pool_init); | |
1782 | ||
6320377f | 1783 | void iscsi_pool_free(struct iscsi_pool *q) |
7996a778 MC |
1784 | { |
1785 | int i; | |
1786 | ||
1787 | for (i = 0; i < q->max; i++) | |
6320377f OK |
1788 | kfree(q->pool[i]); |
1789 | if (q->pool) | |
1790 | kfree(q->pool); | |
7996a778 MC |
1791 | } |
1792 | EXPORT_SYMBOL_GPL(iscsi_pool_free); | |
1793 | ||
a4804cd6 MC |
1794 | /** |
1795 | * iscsi_host_add - add host to system | |
1796 | * @shost: scsi host | |
1797 | * @pdev: parent device | |
1798 | * | |
1799 | * This should be called by partial offload and software iscsi drivers | |
1800 | * to add a host to the system. | |
1801 | */ | |
1802 | int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev) | |
1803 | { | |
1804 | return scsi_add_host(shost, pdev); | |
1805 | } | |
1806 | EXPORT_SYMBOL_GPL(iscsi_host_add); | |
1807 | ||
1808 | /** | |
1809 | * iscsi_host_alloc - allocate a host and driver data | |
1810 | * @sht: scsi host template | |
1811 | * @dd_data_size: driver host data size | |
1812 | * @qdepth: default device queue depth | |
1813 | * | |
1814 | * This should be called by partial offload and software iscsi drivers. | |
1815 | * To access the driver specific memory use the iscsi_host_priv() macro. | |
1816 | */ | |
1817 | struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht, | |
1818 | int dd_data_size, uint16_t qdepth) | |
75613521 | 1819 | { |
a4804cd6 MC |
1820 | struct Scsi_Host *shost; |
1821 | ||
1822 | shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size); | |
1823 | if (!shost) | |
1824 | return NULL; | |
1825 | shost->transportt->eh_timed_out = iscsi_eh_cmd_timed_out; | |
1826 | ||
75613521 MC |
1827 | if (qdepth > ISCSI_MAX_CMD_PER_LUN || qdepth < 1) { |
1828 | if (qdepth != 0) | |
1829 | printk(KERN_ERR "iscsi: invalid queue depth of %d. " | |
1830 | "Queue depth must be between 1 and %d.\n", | |
1831 | qdepth, ISCSI_MAX_CMD_PER_LUN); | |
1832 | qdepth = ISCSI_DEF_CMD_PER_LUN; | |
1833 | } | |
75613521 | 1834 | shost->cmd_per_lun = qdepth; |
a4804cd6 MC |
1835 | return shost; |
1836 | } | |
1837 | EXPORT_SYMBOL_GPL(iscsi_host_alloc); | |
1838 | ||
1839 | /** | |
1840 | * iscsi_host_remove - remove host and sessions | |
1841 | * @shost: scsi host | |
1842 | * | |
1843 | * This will also remove any sessions attached to the host, but if userspace | |
1844 | * is managing the session at the same time this will break. TODO: add | |
1845 | * refcounting to the netlink iscsi interface so a rmmod or host hot unplug | |
1846 | * does not remove the memory from under us. | |
1847 | */ | |
1848 | void iscsi_host_remove(struct Scsi_Host *shost) | |
1849 | { | |
1850 | iscsi_host_for_each_session(shost, iscsi_session_teardown); | |
1851 | scsi_remove_host(shost); | |
75613521 | 1852 | } |
a4804cd6 | 1853 | EXPORT_SYMBOL_GPL(iscsi_host_remove); |
7996a778 | 1854 | |
a4804cd6 | 1855 | void iscsi_host_free(struct Scsi_Host *shost) |
75613521 MC |
1856 | { |
1857 | struct iscsi_host *ihost = shost_priv(shost); | |
7996a778 | 1858 | |
75613521 MC |
1859 | kfree(ihost->netdev); |
1860 | kfree(ihost->hwaddress); | |
1861 | kfree(ihost->initiatorname); | |
a4804cd6 | 1862 | scsi_host_put(shost); |
75613521 | 1863 | } |
a4804cd6 | 1864 | EXPORT_SYMBOL_GPL(iscsi_host_free); |
7996a778 MC |
1865 | |
1866 | /** | |
1867 | * iscsi_session_setup - create iscsi cls session and host and session | |
7996a778 | 1868 | * @iscsit: iscsi transport template |
75613521 MC |
1869 | * @shost: scsi host |
1870 | * @cmds_max: session can queue | |
1548271e MC |
1871 | * @cmd_task_size: LLD ctask private data size |
1872 | * @mgmt_task_size: LLD mtask private data size | |
7996a778 | 1873 | * @initial_cmdsn: initial CmdSN |
7996a778 MC |
1874 | * |
1875 | * This can be used by software iscsi_transports that allocate | |
1876 | * a session per scsi host. | |
75613521 | 1877 | */ |
7996a778 | 1878 | struct iscsi_cls_session * |
75613521 MC |
1879 | iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost, |
1880 | uint16_t cmds_max, int cmd_task_size, int mgmt_task_size, | |
1881 | uint32_t initial_cmdsn) | |
7996a778 | 1882 | { |
7996a778 MC |
1883 | struct iscsi_session *session; |
1884 | struct iscsi_cls_session *cls_session; | |
1885 | int cmd_i; | |
1886 | ||
31ed0bf4 MC |
1887 | if (!is_power_of_2(cmds_max) || cmds_max >= ISCSI_MGMT_ITT_OFFSET || |
1888 | cmds_max < 2) { | |
1548271e MC |
1889 | if (cmds_max != 0) |
1890 | printk(KERN_ERR "iscsi: invalid can_queue of %d. " | |
1891 | "can_queue must be a power of 2 and between " | |
1892 | "2 and %d - setting to %d.\n", cmds_max, | |
1893 | ISCSI_MGMT_ITT_OFFSET, ISCSI_DEF_XMIT_CMDS_MAX); | |
1894 | cmds_max = ISCSI_DEF_XMIT_CMDS_MAX; | |
1895 | } | |
1896 | ||
5d91e209 MC |
1897 | cls_session = iscsi_alloc_session(shost, iscsit, |
1898 | sizeof(struct iscsi_session)); | |
75613521 | 1899 | if (!cls_session) |
7996a778 | 1900 | return NULL; |
75613521 MC |
1901 | session = cls_session->dd_data; |
1902 | session->cls_session = cls_session; | |
7996a778 MC |
1903 | session->host = shost; |
1904 | session->state = ISCSI_STATE_FREE; | |
f6d5180c | 1905 | session->fast_abort = 1; |
4cd49ea1 MC |
1906 | session->lu_reset_timeout = 15; |
1907 | session->abort_timeout = 10; | |
7996a778 | 1908 | session->mgmtpool_max = ISCSI_MGMT_CMDS_MAX; |
1548271e | 1909 | session->cmds_max = cmds_max; |
e0726407 | 1910 | session->queued_cmdsn = session->cmdsn = initial_cmdsn; |
7996a778 MC |
1911 | session->exp_cmdsn = initial_cmdsn + 1; |
1912 | session->max_cmdsn = initial_cmdsn + 1; | |
1913 | session->max_r2t = 1; | |
1914 | session->tt = iscsit; | |
6724add1 | 1915 | mutex_init(&session->eh_mutex); |
75613521 | 1916 | spin_lock_init(&session->lock); |
7996a778 MC |
1917 | |
1918 | /* initialize SCSI PDU commands pool */ | |
1919 | if (iscsi_pool_init(&session->cmdpool, session->cmds_max, | |
1920 | (void***)&session->cmds, | |
1921 | cmd_task_size + sizeof(struct iscsi_cmd_task))) | |
1922 | goto cmdpool_alloc_fail; | |
1923 | ||
1924 | /* pre-format cmds pool with ITT */ | |
1925 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
1926 | struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; | |
1927 | ||
1928 | if (cmd_task_size) | |
1929 | ctask->dd_data = &ctask[1]; | |
1930 | ctask->itt = cmd_i; | |
b6c395ed | 1931 | INIT_LIST_HEAD(&ctask->running); |
7996a778 MC |
1932 | } |
1933 | ||
7996a778 MC |
1934 | /* initialize immediate command pool */ |
1935 | if (iscsi_pool_init(&session->mgmtpool, session->mgmtpool_max, | |
1936 | (void***)&session->mgmt_cmds, | |
1937 | mgmt_task_size + sizeof(struct iscsi_mgmt_task))) | |
1938 | goto mgmtpool_alloc_fail; | |
1939 | ||
1940 | ||
1941 | /* pre-format immediate cmds pool with ITT */ | |
1942 | for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) { | |
1943 | struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i]; | |
1944 | ||
1945 | if (mgmt_task_size) | |
1946 | mtask->dd_data = &mtask[1]; | |
1947 | mtask->itt = ISCSI_MGMT_ITT_OFFSET + cmd_i; | |
b6c395ed | 1948 | INIT_LIST_HEAD(&mtask->running); |
7996a778 MC |
1949 | } |
1950 | ||
f53a88da | 1951 | if (!try_module_get(iscsit->owner)) |
75613521 | 1952 | goto module_get_fail; |
7996a778 | 1953 | |
75613521 MC |
1954 | if (iscsi_add_session(cls_session, 0)) |
1955 | goto cls_session_fail; | |
7996a778 MC |
1956 | return cls_session; |
1957 | ||
1958 | cls_session_fail: | |
75613521 MC |
1959 | module_put(iscsit->owner); |
1960 | module_get_fail: | |
6320377f | 1961 | iscsi_pool_free(&session->mgmtpool); |
7996a778 | 1962 | mgmtpool_alloc_fail: |
6320377f | 1963 | iscsi_pool_free(&session->cmdpool); |
7996a778 | 1964 | cmdpool_alloc_fail: |
75613521 | 1965 | iscsi_free_session(cls_session); |
7996a778 MC |
1966 | return NULL; |
1967 | } | |
1968 | EXPORT_SYMBOL_GPL(iscsi_session_setup); | |
1969 | ||
1970 | /** | |
1971 | * iscsi_session_teardown - destroy session, host, and cls_session | |
75613521 | 1972 | * @cls_session: iscsi session |
7996a778 | 1973 | * |
75613521 MC |
1974 | * The driver must have called iscsi_remove_session before |
1975 | * calling this. | |
1976 | */ | |
7996a778 MC |
1977 | void iscsi_session_teardown(struct iscsi_cls_session *cls_session) |
1978 | { | |
75613521 | 1979 | struct iscsi_session *session = cls_session->dd_data; |
63f75cc8 | 1980 | struct module *owner = cls_session->transport->owner; |
7996a778 | 1981 | |
6320377f OK |
1982 | iscsi_pool_free(&session->mgmtpool); |
1983 | iscsi_pool_free(&session->cmdpool); | |
7996a778 | 1984 | |
b2c64167 MC |
1985 | kfree(session->password); |
1986 | kfree(session->password_in); | |
1987 | kfree(session->username); | |
1988 | kfree(session->username_in); | |
f3ff0c36 MC |
1989 | kfree(session->targetname); |
1990 | ||
75613521 | 1991 | iscsi_destroy_session(cls_session); |
63f75cc8 | 1992 | module_put(owner); |
7996a778 MC |
1993 | } |
1994 | EXPORT_SYMBOL_GPL(iscsi_session_teardown); | |
1995 | ||
1996 | /** | |
1997 | * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn | |
1998 | * @cls_session: iscsi_cls_session | |
5d91e209 | 1999 | * @dd_size: private driver data size |
7996a778 | 2000 | * @conn_idx: cid |
5d91e209 | 2001 | */ |
7996a778 | 2002 | struct iscsi_cls_conn * |
5d91e209 MC |
2003 | iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size, |
2004 | uint32_t conn_idx) | |
7996a778 | 2005 | { |
75613521 | 2006 | struct iscsi_session *session = cls_session->dd_data; |
7996a778 MC |
2007 | struct iscsi_conn *conn; |
2008 | struct iscsi_cls_conn *cls_conn; | |
d36ab6f3 | 2009 | char *data; |
7996a778 | 2010 | |
5d91e209 MC |
2011 | cls_conn = iscsi_create_conn(cls_session, sizeof(*conn) + dd_size, |
2012 | conn_idx); | |
7996a778 MC |
2013 | if (!cls_conn) |
2014 | return NULL; | |
2015 | conn = cls_conn->dd_data; | |
5d91e209 | 2016 | memset(conn, 0, sizeof(*conn) + dd_size); |
7996a778 | 2017 | |
5d91e209 | 2018 | conn->dd_data = cls_conn->dd_data + sizeof(*conn); |
7996a778 MC |
2019 | conn->session = session; |
2020 | conn->cls_conn = cls_conn; | |
2021 | conn->c_stage = ISCSI_CONN_INITIAL_STAGE; | |
2022 | conn->id = conn_idx; | |
2023 | conn->exp_statsn = 0; | |
843c0a8a | 2024 | conn->tmf_state = TMF_INITIAL; |
f6d5180c MC |
2025 | |
2026 | init_timer(&conn->transport_timer); | |
2027 | conn->transport_timer.data = (unsigned long)conn; | |
2028 | conn->transport_timer.function = iscsi_check_transport_timeouts; | |
2029 | ||
7996a778 MC |
2030 | INIT_LIST_HEAD(&conn->run_list); |
2031 | INIT_LIST_HEAD(&conn->mgmt_run_list); | |
843c0a8a | 2032 | INIT_LIST_HEAD(&conn->mgmtqueue); |
b6c395ed | 2033 | INIT_LIST_HEAD(&conn->xmitqueue); |
843c0a8a | 2034 | INIT_LIST_HEAD(&conn->requeue); |
c4028958 | 2035 | INIT_WORK(&conn->xmitwork, iscsi_xmitworker); |
7996a778 MC |
2036 | |
2037 | /* allocate login_mtask used for the login/text sequences */ | |
2038 | spin_lock_bh(&session->lock); | |
2039 | if (!__kfifo_get(session->mgmtpool.queue, | |
2040 | (void*)&conn->login_mtask, | |
2041 | sizeof(void*))) { | |
2042 | spin_unlock_bh(&session->lock); | |
2043 | goto login_mtask_alloc_fail; | |
2044 | } | |
2045 | spin_unlock_bh(&session->lock); | |
2046 | ||
bf32ed33 | 2047 | data = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN, GFP_KERNEL); |
d36ab6f3 MC |
2048 | if (!data) |
2049 | goto login_mtask_data_alloc_fail; | |
c8dc1e52 | 2050 | conn->login_mtask->data = conn->data = data; |
d36ab6f3 | 2051 | |
843c0a8a | 2052 | init_timer(&conn->tmf_timer); |
7996a778 MC |
2053 | init_waitqueue_head(&conn->ehwait); |
2054 | ||
2055 | return cls_conn; | |
2056 | ||
d36ab6f3 MC |
2057 | login_mtask_data_alloc_fail: |
2058 | __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask, | |
2059 | sizeof(void*)); | |
7996a778 | 2060 | login_mtask_alloc_fail: |
7996a778 MC |
2061 | iscsi_destroy_conn(cls_conn); |
2062 | return NULL; | |
2063 | } | |
2064 | EXPORT_SYMBOL_GPL(iscsi_conn_setup); | |
2065 | ||
2066 | /** | |
2067 | * iscsi_conn_teardown - teardown iscsi connection | |
2068 | * cls_conn: iscsi class connection | |
2069 | * | |
2070 | * TODO: we may need to make this into a two step process | |
2071 | * like scsi-mls remove + put host | |
2072 | */ | |
2073 | void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn) | |
2074 | { | |
2075 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2076 | struct iscsi_session *session = conn->session; | |
2077 | unsigned long flags; | |
2078 | ||
f6d5180c MC |
2079 | del_timer_sync(&conn->transport_timer); |
2080 | ||
7996a778 MC |
2081 | spin_lock_bh(&session->lock); |
2082 | conn->c_stage = ISCSI_CONN_CLEANUP_WAIT; | |
2083 | if (session->leadconn == conn) { | |
2084 | /* | |
2085 | * leading connection? then give up on recovery. | |
2086 | */ | |
2087 | session->state = ISCSI_STATE_TERMINATE; | |
2088 | wake_up(&conn->ehwait); | |
2089 | } | |
2090 | spin_unlock_bh(&session->lock); | |
2091 | ||
7996a778 MC |
2092 | /* |
2093 | * Block until all in-progress commands for this connection | |
2094 | * time out or fail. | |
2095 | */ | |
2096 | for (;;) { | |
2097 | spin_lock_irqsave(session->host->host_lock, flags); | |
2098 | if (!session->host->host_busy) { /* OK for ERL == 0 */ | |
2099 | spin_unlock_irqrestore(session->host->host_lock, flags); | |
2100 | break; | |
2101 | } | |
2102 | spin_unlock_irqrestore(session->host->host_lock, flags); | |
2103 | msleep_interruptible(500); | |
322d739d MC |
2104 | iscsi_conn_printk(KERN_INFO, conn, "iscsi conn_destroy(): " |
2105 | "host_busy %d host_failed %d\n", | |
2106 | session->host->host_busy, | |
2107 | session->host->host_failed); | |
7996a778 MC |
2108 | /* |
2109 | * force eh_abort() to unblock | |
2110 | */ | |
2111 | wake_up(&conn->ehwait); | |
2112 | } | |
2113 | ||
779ea120 | 2114 | /* flush queued up work because we free the connection below */ |
843c0a8a | 2115 | iscsi_suspend_tx(conn); |
779ea120 | 2116 | |
7996a778 | 2117 | spin_lock_bh(&session->lock); |
c8dc1e52 | 2118 | kfree(conn->data); |
f3ff0c36 | 2119 | kfree(conn->persistent_address); |
7996a778 MC |
2120 | __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask, |
2121 | sizeof(void*)); | |
e0726407 | 2122 | if (session->leadconn == conn) |
7996a778 | 2123 | session->leadconn = NULL; |
7996a778 MC |
2124 | spin_unlock_bh(&session->lock); |
2125 | ||
7996a778 MC |
2126 | iscsi_destroy_conn(cls_conn); |
2127 | } | |
2128 | EXPORT_SYMBOL_GPL(iscsi_conn_teardown); | |
2129 | ||
2130 | int iscsi_conn_start(struct iscsi_cls_conn *cls_conn) | |
2131 | { | |
2132 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2133 | struct iscsi_session *session = conn->session; | |
2134 | ||
ffd0436e | 2135 | if (!session) { |
322d739d MC |
2136 | iscsi_conn_printk(KERN_ERR, conn, |
2137 | "can't start unbound connection\n"); | |
7996a778 MC |
2138 | return -EPERM; |
2139 | } | |
2140 | ||
db98ccde MC |
2141 | if ((session->imm_data_en || !session->initial_r2t_en) && |
2142 | session->first_burst > session->max_burst) { | |
322d739d MC |
2143 | iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: " |
2144 | "first_burst %d max_burst %d\n", | |
2145 | session->first_burst, session->max_burst); | |
ffd0436e MC |
2146 | return -EINVAL; |
2147 | } | |
2148 | ||
f6d5180c | 2149 | if (conn->ping_timeout && !conn->recv_timeout) { |
322d739d MC |
2150 | iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of " |
2151 | "zero. Using 5 seconds\n."); | |
f6d5180c MC |
2152 | conn->recv_timeout = 5; |
2153 | } | |
2154 | ||
2155 | if (conn->recv_timeout && !conn->ping_timeout) { | |
322d739d MC |
2156 | iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of " |
2157 | "zero. Using 5 seconds.\n"); | |
f6d5180c MC |
2158 | conn->ping_timeout = 5; |
2159 | } | |
2160 | ||
7996a778 MC |
2161 | spin_lock_bh(&session->lock); |
2162 | conn->c_stage = ISCSI_CONN_STARTED; | |
2163 | session->state = ISCSI_STATE_LOGGED_IN; | |
e0726407 | 2164 | session->queued_cmdsn = session->cmdsn; |
7996a778 | 2165 | |
f6d5180c MC |
2166 | conn->last_recv = jiffies; |
2167 | conn->last_ping = jiffies; | |
2168 | if (conn->recv_timeout && conn->ping_timeout) | |
2169 | mod_timer(&conn->transport_timer, | |
2170 | jiffies + (conn->recv_timeout * HZ)); | |
2171 | ||
7996a778 MC |
2172 | switch(conn->stop_stage) { |
2173 | case STOP_CONN_RECOVER: | |
2174 | /* | |
2175 | * unblock eh_abort() if it is blocked. re-try all | |
2176 | * commands after successful recovery | |
2177 | */ | |
7996a778 | 2178 | conn->stop_stage = 0; |
843c0a8a | 2179 | conn->tmf_state = TMF_INITIAL; |
7996a778 | 2180 | session->age++; |
8b1d0343 MC |
2181 | if (session->age == 16) |
2182 | session->age = 0; | |
6eabafbe | 2183 | break; |
7996a778 | 2184 | case STOP_CONN_TERM: |
7996a778 | 2185 | conn->stop_stage = 0; |
7996a778 MC |
2186 | break; |
2187 | default: | |
2188 | break; | |
2189 | } | |
2190 | spin_unlock_bh(&session->lock); | |
2191 | ||
75613521 | 2192 | iscsi_unblock_session(session->cls_session); |
6eabafbe | 2193 | wake_up(&conn->ehwait); |
7996a778 MC |
2194 | return 0; |
2195 | } | |
2196 | EXPORT_SYMBOL_GPL(iscsi_conn_start); | |
2197 | ||
2198 | static void | |
2199 | flush_control_queues(struct iscsi_session *session, struct iscsi_conn *conn) | |
2200 | { | |
2201 | struct iscsi_mgmt_task *mtask, *tmp; | |
2202 | ||
2203 | /* handle pending */ | |
843c0a8a MC |
2204 | list_for_each_entry_safe(mtask, tmp, &conn->mgmtqueue, running) { |
2205 | debug_scsi("flushing pending mgmt task itt 0x%x\n", mtask->itt); | |
b3a7ea8d | 2206 | iscsi_free_mgmt_task(conn, mtask); |
7996a778 MC |
2207 | } |
2208 | ||
2209 | /* handle running */ | |
2210 | list_for_each_entry_safe(mtask, tmp, &conn->mgmt_run_list, running) { | |
2211 | debug_scsi("flushing running mgmt task itt 0x%x\n", mtask->itt); | |
b3a7ea8d | 2212 | iscsi_free_mgmt_task(conn, mtask); |
7996a778 MC |
2213 | } |
2214 | ||
2215 | conn->mtask = NULL; | |
2216 | } | |
2217 | ||
656cffc9 MC |
2218 | static void iscsi_start_session_recovery(struct iscsi_session *session, |
2219 | struct iscsi_conn *conn, int flag) | |
7996a778 | 2220 | { |
ed2abc7f MC |
2221 | int old_stop_stage; |
2222 | ||
f6d5180c MC |
2223 | del_timer_sync(&conn->transport_timer); |
2224 | ||
6724add1 | 2225 | mutex_lock(&session->eh_mutex); |
7996a778 | 2226 | spin_lock_bh(&session->lock); |
ed2abc7f | 2227 | if (conn->stop_stage == STOP_CONN_TERM) { |
7996a778 | 2228 | spin_unlock_bh(&session->lock); |
6724add1 MC |
2229 | mutex_unlock(&session->eh_mutex); |
2230 | return; | |
2231 | } | |
2232 | ||
2233 | /* | |
2234 | * The LLD either freed/unset the lock on us, or userspace called | |
2235 | * stop but did not create a proper connection (connection was never | |
2236 | * bound or it was unbound then stop was called). | |
2237 | */ | |
2238 | if (!conn->recv_lock) { | |
2239 | spin_unlock_bh(&session->lock); | |
2240 | mutex_unlock(&session->eh_mutex); | |
7996a778 MC |
2241 | return; |
2242 | } | |
ed2abc7f MC |
2243 | |
2244 | /* | |
2245 | * When this is called for the in_login state, we only want to clean | |
67a61114 MC |
2246 | * up the login task and connection. We do not need to block and set |
2247 | * the recovery state again | |
ed2abc7f | 2248 | */ |
67a61114 MC |
2249 | if (flag == STOP_CONN_TERM) |
2250 | session->state = ISCSI_STATE_TERMINATE; | |
2251 | else if (conn->stop_stage != STOP_CONN_RECOVER) | |
2252 | session->state = ISCSI_STATE_IN_RECOVERY; | |
ed2abc7f MC |
2253 | |
2254 | old_stop_stage = conn->stop_stage; | |
7996a778 | 2255 | conn->stop_stage = flag; |
67a61114 | 2256 | conn->c_stage = ISCSI_CONN_STOPPED; |
7996a778 | 2257 | spin_unlock_bh(&session->lock); |
6724add1 MC |
2258 | |
2259 | iscsi_suspend_tx(conn); | |
7996a778 | 2260 | |
1c83469d MC |
2261 | write_lock_bh(conn->recv_lock); |
2262 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
2263 | write_unlock_bh(conn->recv_lock); | |
7996a778 | 2264 | |
7996a778 MC |
2265 | /* |
2266 | * for connection level recovery we should not calculate | |
2267 | * header digest. conn->hdr_size used for optimization | |
2268 | * in hdr_extract() and will be re-negotiated at | |
2269 | * set_param() time. | |
2270 | */ | |
2271 | if (flag == STOP_CONN_RECOVER) { | |
2272 | conn->hdrdgst_en = 0; | |
2273 | conn->datadgst_en = 0; | |
656cffc9 | 2274 | if (session->state == ISCSI_STATE_IN_RECOVERY && |
67a61114 MC |
2275 | old_stop_stage != STOP_CONN_RECOVER) { |
2276 | debug_scsi("blocking session\n"); | |
75613521 | 2277 | iscsi_block_session(session->cls_session); |
67a61114 | 2278 | } |
7996a778 | 2279 | } |
656cffc9 | 2280 | |
656cffc9 MC |
2281 | /* |
2282 | * flush queues. | |
2283 | */ | |
2284 | spin_lock_bh(&session->lock); | |
6eabafbe MC |
2285 | fail_all_commands(conn, -1, |
2286 | STOP_CONN_RECOVER ? DID_BUS_BUSY : DID_ERROR); | |
656cffc9 MC |
2287 | flush_control_queues(session, conn); |
2288 | spin_unlock_bh(&session->lock); | |
6724add1 | 2289 | mutex_unlock(&session->eh_mutex); |
7996a778 | 2290 | } |
7996a778 MC |
2291 | |
2292 | void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) | |
2293 | { | |
2294 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2295 | struct iscsi_session *session = conn->session; | |
2296 | ||
2297 | switch (flag) { | |
2298 | case STOP_CONN_RECOVER: | |
2299 | case STOP_CONN_TERM: | |
2300 | iscsi_start_session_recovery(session, conn, flag); | |
8d2860b3 | 2301 | break; |
7996a778 | 2302 | default: |
322d739d MC |
2303 | iscsi_conn_printk(KERN_ERR, conn, |
2304 | "invalid stop flag %d\n", flag); | |
7996a778 MC |
2305 | } |
2306 | } | |
2307 | EXPORT_SYMBOL_GPL(iscsi_conn_stop); | |
2308 | ||
2309 | int iscsi_conn_bind(struct iscsi_cls_session *cls_session, | |
2310 | struct iscsi_cls_conn *cls_conn, int is_leading) | |
2311 | { | |
75613521 | 2312 | struct iscsi_session *session = cls_session->dd_data; |
98644047 | 2313 | struct iscsi_conn *conn = cls_conn->dd_data; |
7996a778 | 2314 | |
7996a778 | 2315 | spin_lock_bh(&session->lock); |
7996a778 MC |
2316 | if (is_leading) |
2317 | session->leadconn = conn; | |
98644047 | 2318 | spin_unlock_bh(&session->lock); |
7996a778 MC |
2319 | |
2320 | /* | |
2321 | * Unblock xmitworker(), Login Phase will pass through. | |
2322 | */ | |
2323 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
2324 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
2325 | return 0; | |
2326 | } | |
2327 | EXPORT_SYMBOL_GPL(iscsi_conn_bind); | |
2328 | ||
a54a52ca MC |
2329 | |
2330 | int iscsi_set_param(struct iscsi_cls_conn *cls_conn, | |
2331 | enum iscsi_param param, char *buf, int buflen) | |
2332 | { | |
2333 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2334 | struct iscsi_session *session = conn->session; | |
2335 | uint32_t value; | |
2336 | ||
2337 | switch(param) { | |
843c0a8a MC |
2338 | case ISCSI_PARAM_FAST_ABORT: |
2339 | sscanf(buf, "%d", &session->fast_abort); | |
2340 | break; | |
f6d5180c MC |
2341 | case ISCSI_PARAM_ABORT_TMO: |
2342 | sscanf(buf, "%d", &session->abort_timeout); | |
2343 | break; | |
2344 | case ISCSI_PARAM_LU_RESET_TMO: | |
2345 | sscanf(buf, "%d", &session->lu_reset_timeout); | |
2346 | break; | |
2347 | case ISCSI_PARAM_PING_TMO: | |
2348 | sscanf(buf, "%d", &conn->ping_timeout); | |
2349 | break; | |
2350 | case ISCSI_PARAM_RECV_TMO: | |
2351 | sscanf(buf, "%d", &conn->recv_timeout); | |
2352 | break; | |
a54a52ca MC |
2353 | case ISCSI_PARAM_MAX_RECV_DLENGTH: |
2354 | sscanf(buf, "%d", &conn->max_recv_dlength); | |
2355 | break; | |
2356 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
2357 | sscanf(buf, "%d", &conn->max_xmit_dlength); | |
2358 | break; | |
2359 | case ISCSI_PARAM_HDRDGST_EN: | |
2360 | sscanf(buf, "%d", &conn->hdrdgst_en); | |
2361 | break; | |
2362 | case ISCSI_PARAM_DATADGST_EN: | |
2363 | sscanf(buf, "%d", &conn->datadgst_en); | |
2364 | break; | |
2365 | case ISCSI_PARAM_INITIAL_R2T_EN: | |
2366 | sscanf(buf, "%d", &session->initial_r2t_en); | |
2367 | break; | |
2368 | case ISCSI_PARAM_MAX_R2T: | |
2369 | sscanf(buf, "%d", &session->max_r2t); | |
2370 | break; | |
2371 | case ISCSI_PARAM_IMM_DATA_EN: | |
2372 | sscanf(buf, "%d", &session->imm_data_en); | |
2373 | break; | |
2374 | case ISCSI_PARAM_FIRST_BURST: | |
2375 | sscanf(buf, "%d", &session->first_burst); | |
2376 | break; | |
2377 | case ISCSI_PARAM_MAX_BURST: | |
2378 | sscanf(buf, "%d", &session->max_burst); | |
2379 | break; | |
2380 | case ISCSI_PARAM_PDU_INORDER_EN: | |
2381 | sscanf(buf, "%d", &session->pdu_inorder_en); | |
2382 | break; | |
2383 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
2384 | sscanf(buf, "%d", &session->dataseq_inorder_en); | |
2385 | break; | |
2386 | case ISCSI_PARAM_ERL: | |
2387 | sscanf(buf, "%d", &session->erl); | |
2388 | break; | |
2389 | case ISCSI_PARAM_IFMARKER_EN: | |
2390 | sscanf(buf, "%d", &value); | |
2391 | BUG_ON(value); | |
2392 | break; | |
2393 | case ISCSI_PARAM_OFMARKER_EN: | |
2394 | sscanf(buf, "%d", &value); | |
2395 | BUG_ON(value); | |
2396 | break; | |
2397 | case ISCSI_PARAM_EXP_STATSN: | |
2398 | sscanf(buf, "%u", &conn->exp_statsn); | |
2399 | break; | |
b2c64167 MC |
2400 | case ISCSI_PARAM_USERNAME: |
2401 | kfree(session->username); | |
2402 | session->username = kstrdup(buf, GFP_KERNEL); | |
2403 | if (!session->username) | |
2404 | return -ENOMEM; | |
2405 | break; | |
2406 | case ISCSI_PARAM_USERNAME_IN: | |
2407 | kfree(session->username_in); | |
2408 | session->username_in = kstrdup(buf, GFP_KERNEL); | |
2409 | if (!session->username_in) | |
2410 | return -ENOMEM; | |
2411 | break; | |
2412 | case ISCSI_PARAM_PASSWORD: | |
2413 | kfree(session->password); | |
2414 | session->password = kstrdup(buf, GFP_KERNEL); | |
2415 | if (!session->password) | |
2416 | return -ENOMEM; | |
2417 | break; | |
2418 | case ISCSI_PARAM_PASSWORD_IN: | |
2419 | kfree(session->password_in); | |
2420 | session->password_in = kstrdup(buf, GFP_KERNEL); | |
2421 | if (!session->password_in) | |
2422 | return -ENOMEM; | |
2423 | break; | |
a54a52ca MC |
2424 | case ISCSI_PARAM_TARGET_NAME: |
2425 | /* this should not change between logins */ | |
2426 | if (session->targetname) | |
2427 | break; | |
2428 | ||
2429 | session->targetname = kstrdup(buf, GFP_KERNEL); | |
2430 | if (!session->targetname) | |
2431 | return -ENOMEM; | |
2432 | break; | |
2433 | case ISCSI_PARAM_TPGT: | |
2434 | sscanf(buf, "%d", &session->tpgt); | |
2435 | break; | |
2436 | case ISCSI_PARAM_PERSISTENT_PORT: | |
2437 | sscanf(buf, "%d", &conn->persistent_port); | |
2438 | break; | |
2439 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
2440 | /* | |
2441 | * this is the address returned in discovery so it should | |
2442 | * not change between logins. | |
2443 | */ | |
2444 | if (conn->persistent_address) | |
2445 | break; | |
2446 | ||
2447 | conn->persistent_address = kstrdup(buf, GFP_KERNEL); | |
2448 | if (!conn->persistent_address) | |
2449 | return -ENOMEM; | |
2450 | break; | |
2451 | default: | |
2452 | return -ENOSYS; | |
2453 | } | |
2454 | ||
2455 | return 0; | |
2456 | } | |
2457 | EXPORT_SYMBOL_GPL(iscsi_set_param); | |
2458 | ||
2459 | int iscsi_session_get_param(struct iscsi_cls_session *cls_session, | |
2460 | enum iscsi_param param, char *buf) | |
2461 | { | |
75613521 | 2462 | struct iscsi_session *session = cls_session->dd_data; |
a54a52ca MC |
2463 | int len; |
2464 | ||
2465 | switch(param) { | |
843c0a8a MC |
2466 | case ISCSI_PARAM_FAST_ABORT: |
2467 | len = sprintf(buf, "%d\n", session->fast_abort); | |
2468 | break; | |
f6d5180c MC |
2469 | case ISCSI_PARAM_ABORT_TMO: |
2470 | len = sprintf(buf, "%d\n", session->abort_timeout); | |
2471 | break; | |
2472 | case ISCSI_PARAM_LU_RESET_TMO: | |
2473 | len = sprintf(buf, "%d\n", session->lu_reset_timeout); | |
2474 | break; | |
a54a52ca MC |
2475 | case ISCSI_PARAM_INITIAL_R2T_EN: |
2476 | len = sprintf(buf, "%d\n", session->initial_r2t_en); | |
2477 | break; | |
2478 | case ISCSI_PARAM_MAX_R2T: | |
2479 | len = sprintf(buf, "%hu\n", session->max_r2t); | |
2480 | break; | |
2481 | case ISCSI_PARAM_IMM_DATA_EN: | |
2482 | len = sprintf(buf, "%d\n", session->imm_data_en); | |
2483 | break; | |
2484 | case ISCSI_PARAM_FIRST_BURST: | |
2485 | len = sprintf(buf, "%u\n", session->first_burst); | |
2486 | break; | |
2487 | case ISCSI_PARAM_MAX_BURST: | |
2488 | len = sprintf(buf, "%u\n", session->max_burst); | |
2489 | break; | |
2490 | case ISCSI_PARAM_PDU_INORDER_EN: | |
2491 | len = sprintf(buf, "%d\n", session->pdu_inorder_en); | |
2492 | break; | |
2493 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
2494 | len = sprintf(buf, "%d\n", session->dataseq_inorder_en); | |
2495 | break; | |
2496 | case ISCSI_PARAM_ERL: | |
2497 | len = sprintf(buf, "%d\n", session->erl); | |
2498 | break; | |
2499 | case ISCSI_PARAM_TARGET_NAME: | |
2500 | len = sprintf(buf, "%s\n", session->targetname); | |
2501 | break; | |
2502 | case ISCSI_PARAM_TPGT: | |
2503 | len = sprintf(buf, "%d\n", session->tpgt); | |
2504 | break; | |
b2c64167 MC |
2505 | case ISCSI_PARAM_USERNAME: |
2506 | len = sprintf(buf, "%s\n", session->username); | |
2507 | break; | |
2508 | case ISCSI_PARAM_USERNAME_IN: | |
2509 | len = sprintf(buf, "%s\n", session->username_in); | |
2510 | break; | |
2511 | case ISCSI_PARAM_PASSWORD: | |
2512 | len = sprintf(buf, "%s\n", session->password); | |
2513 | break; | |
2514 | case ISCSI_PARAM_PASSWORD_IN: | |
2515 | len = sprintf(buf, "%s\n", session->password_in); | |
2516 | break; | |
a54a52ca MC |
2517 | default: |
2518 | return -ENOSYS; | |
2519 | } | |
2520 | ||
2521 | return len; | |
2522 | } | |
2523 | EXPORT_SYMBOL_GPL(iscsi_session_get_param); | |
2524 | ||
2525 | int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn, | |
2526 | enum iscsi_param param, char *buf) | |
2527 | { | |
2528 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2529 | int len; | |
2530 | ||
2531 | switch(param) { | |
f6d5180c MC |
2532 | case ISCSI_PARAM_PING_TMO: |
2533 | len = sprintf(buf, "%u\n", conn->ping_timeout); | |
2534 | break; | |
2535 | case ISCSI_PARAM_RECV_TMO: | |
2536 | len = sprintf(buf, "%u\n", conn->recv_timeout); | |
2537 | break; | |
a54a52ca MC |
2538 | case ISCSI_PARAM_MAX_RECV_DLENGTH: |
2539 | len = sprintf(buf, "%u\n", conn->max_recv_dlength); | |
2540 | break; | |
2541 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
2542 | len = sprintf(buf, "%u\n", conn->max_xmit_dlength); | |
2543 | break; | |
2544 | case ISCSI_PARAM_HDRDGST_EN: | |
2545 | len = sprintf(buf, "%d\n", conn->hdrdgst_en); | |
2546 | break; | |
2547 | case ISCSI_PARAM_DATADGST_EN: | |
2548 | len = sprintf(buf, "%d\n", conn->datadgst_en); | |
2549 | break; | |
2550 | case ISCSI_PARAM_IFMARKER_EN: | |
2551 | len = sprintf(buf, "%d\n", conn->ifmarker_en); | |
2552 | break; | |
2553 | case ISCSI_PARAM_OFMARKER_EN: | |
2554 | len = sprintf(buf, "%d\n", conn->ofmarker_en); | |
2555 | break; | |
2556 | case ISCSI_PARAM_EXP_STATSN: | |
2557 | len = sprintf(buf, "%u\n", conn->exp_statsn); | |
2558 | break; | |
2559 | case ISCSI_PARAM_PERSISTENT_PORT: | |
2560 | len = sprintf(buf, "%d\n", conn->persistent_port); | |
2561 | break; | |
2562 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
2563 | len = sprintf(buf, "%s\n", conn->persistent_address); | |
2564 | break; | |
2565 | default: | |
2566 | return -ENOSYS; | |
2567 | } | |
2568 | ||
2569 | return len; | |
2570 | } | |
2571 | EXPORT_SYMBOL_GPL(iscsi_conn_get_param); | |
2572 | ||
0801c242 MC |
2573 | int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param, |
2574 | char *buf) | |
2575 | { | |
75613521 | 2576 | struct iscsi_host *ihost = shost_priv(shost); |
0801c242 MC |
2577 | int len; |
2578 | ||
2579 | switch (param) { | |
d8196ed2 | 2580 | case ISCSI_HOST_PARAM_NETDEV_NAME: |
75613521 | 2581 | if (!ihost->netdev) |
d8196ed2 MC |
2582 | len = sprintf(buf, "%s\n", "default"); |
2583 | else | |
75613521 | 2584 | len = sprintf(buf, "%s\n", ihost->netdev); |
d8196ed2 | 2585 | break; |
0801c242 | 2586 | case ISCSI_HOST_PARAM_HWADDRESS: |
75613521 | 2587 | if (!ihost->hwaddress) |
0801c242 MC |
2588 | len = sprintf(buf, "%s\n", "default"); |
2589 | else | |
75613521 | 2590 | len = sprintf(buf, "%s\n", ihost->hwaddress); |
0801c242 | 2591 | break; |
8ad5781a | 2592 | case ISCSI_HOST_PARAM_INITIATOR_NAME: |
75613521 | 2593 | if (!ihost->initiatorname) |
8ad5781a MC |
2594 | len = sprintf(buf, "%s\n", "unknown"); |
2595 | else | |
75613521 | 2596 | len = sprintf(buf, "%s\n", ihost->initiatorname); |
8ad5781a | 2597 | break; |
75613521 MC |
2598 | case ISCSI_HOST_PARAM_IPADDRESS: |
2599 | if (!strlen(ihost->local_address)) | |
2600 | len = sprintf(buf, "%s\n", "unknown"); | |
2601 | else | |
2602 | len = sprintf(buf, "%s\n", | |
2603 | ihost->local_address); | |
0801c242 MC |
2604 | default: |
2605 | return -ENOSYS; | |
2606 | } | |
2607 | ||
2608 | return len; | |
2609 | } | |
2610 | EXPORT_SYMBOL_GPL(iscsi_host_get_param); | |
2611 | ||
2612 | int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param, | |
2613 | char *buf, int buflen) | |
2614 | { | |
75613521 | 2615 | struct iscsi_host *ihost = shost_priv(shost); |
0801c242 MC |
2616 | |
2617 | switch (param) { | |
d8196ed2 | 2618 | case ISCSI_HOST_PARAM_NETDEV_NAME: |
75613521 MC |
2619 | if (!ihost->netdev) |
2620 | ihost->netdev = kstrdup(buf, GFP_KERNEL); | |
d8196ed2 | 2621 | break; |
0801c242 | 2622 | case ISCSI_HOST_PARAM_HWADDRESS: |
75613521 MC |
2623 | if (!ihost->hwaddress) |
2624 | ihost->hwaddress = kstrdup(buf, GFP_KERNEL); | |
0801c242 | 2625 | break; |
8ad5781a | 2626 | case ISCSI_HOST_PARAM_INITIATOR_NAME: |
75613521 MC |
2627 | if (!ihost->initiatorname) |
2628 | ihost->initiatorname = kstrdup(buf, GFP_KERNEL); | |
8ad5781a | 2629 | break; |
0801c242 MC |
2630 | default: |
2631 | return -ENOSYS; | |
2632 | } | |
2633 | ||
2634 | return 0; | |
2635 | } | |
2636 | EXPORT_SYMBOL_GPL(iscsi_host_set_param); | |
2637 | ||
7996a778 MC |
2638 | MODULE_AUTHOR("Mike Christie"); |
2639 | MODULE_DESCRIPTION("iSCSI library functions"); | |
2640 | MODULE_LICENSE("GPL"); |