Commit | Line | Data |
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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> | |
8eb00539 | 27 | #include <asm/unaligned.h> |
7996a778 MC |
28 | #include <net/tcp.h> |
29 | #include <scsi/scsi_cmnd.h> | |
30 | #include <scsi/scsi_device.h> | |
31 | #include <scsi/scsi_eh.h> | |
32 | #include <scsi/scsi_tcq.h> | |
33 | #include <scsi/scsi_host.h> | |
34 | #include <scsi/scsi.h> | |
35 | #include <scsi/iscsi_proto.h> | |
36 | #include <scsi/scsi_transport.h> | |
37 | #include <scsi/scsi_transport_iscsi.h> | |
38 | #include <scsi/libiscsi.h> | |
39 | ||
40 | struct iscsi_session * | |
41 | class_to_transport_session(struct iscsi_cls_session *cls_session) | |
42 | { | |
43 | struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); | |
44 | return iscsi_hostdata(shost->hostdata); | |
45 | } | |
46 | EXPORT_SYMBOL_GPL(class_to_transport_session); | |
47 | ||
77a23c21 MC |
48 | /* Serial Number Arithmetic, 32 bits, less than, RFC1982 */ |
49 | #define SNA32_CHECK 2147483648UL | |
7996a778 | 50 | |
77a23c21 MC |
51 | static int iscsi_sna_lt(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 | /* Serial Number Arithmetic, 32 bits, less than, RFC1982 */ | |
58 | static int iscsi_sna_lte(u32 n1, u32 n2) | |
59 | { | |
60 | return n1 == n2 || ((n1 < n2 && (n2 - n1 < SNA32_CHECK)) || | |
61 | (n1 > n2 && (n2 - n1 < SNA32_CHECK))); | |
62 | } | |
63 | ||
64 | void | |
65 | iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr) | |
7996a778 MC |
66 | { |
67 | uint32_t max_cmdsn = be32_to_cpu(hdr->max_cmdsn); | |
68 | uint32_t exp_cmdsn = be32_to_cpu(hdr->exp_cmdsn); | |
69 | ||
77a23c21 MC |
70 | /* |
71 | * standard specifies this check for when to update expected and | |
72 | * max sequence numbers | |
73 | */ | |
74 | if (iscsi_sna_lt(max_cmdsn, exp_cmdsn - 1)) | |
75 | return; | |
76 | ||
77 | if (exp_cmdsn != session->exp_cmdsn && | |
78 | !iscsi_sna_lt(exp_cmdsn, session->exp_cmdsn)) | |
7996a778 MC |
79 | session->exp_cmdsn = exp_cmdsn; |
80 | ||
77a23c21 MC |
81 | if (max_cmdsn != session->max_cmdsn && |
82 | !iscsi_sna_lt(max_cmdsn, session->max_cmdsn)) { | |
83 | session->max_cmdsn = max_cmdsn; | |
84 | /* | |
85 | * if the window closed with IO queued, then kick the | |
86 | * xmit thread | |
87 | */ | |
88 | if (!list_empty(&session->leadconn->xmitqueue) || | |
843c0a8a | 89 | !list_empty(&session->leadconn->mgmtqueue)) |
77a23c21 MC |
90 | scsi_queue_work(session->host, |
91 | &session->leadconn->xmitwork); | |
92 | } | |
7996a778 | 93 | } |
77a23c21 | 94 | EXPORT_SYMBOL_GPL(iscsi_update_cmdsn); |
7996a778 MC |
95 | |
96 | void iscsi_prep_unsolicit_data_pdu(struct iscsi_cmd_task *ctask, | |
ffd0436e | 97 | struct iscsi_data *hdr) |
7996a778 MC |
98 | { |
99 | struct iscsi_conn *conn = ctask->conn; | |
100 | ||
101 | memset(hdr, 0, sizeof(struct iscsi_data)); | |
102 | hdr->ttt = cpu_to_be32(ISCSI_RESERVED_TAG); | |
103 | hdr->datasn = cpu_to_be32(ctask->unsol_datasn); | |
104 | ctask->unsol_datasn++; | |
105 | hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; | |
106 | memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); | |
107 | ||
108 | hdr->itt = ctask->hdr->itt; | |
109 | hdr->exp_statsn = cpu_to_be32(conn->exp_statsn); | |
ffd0436e | 110 | hdr->offset = cpu_to_be32(ctask->unsol_offset); |
7996a778 MC |
111 | |
112 | if (ctask->unsol_count > conn->max_xmit_dlength) { | |
113 | hton24(hdr->dlength, conn->max_xmit_dlength); | |
114 | ctask->data_count = conn->max_xmit_dlength; | |
ffd0436e | 115 | ctask->unsol_offset += ctask->data_count; |
7996a778 MC |
116 | hdr->flags = 0; |
117 | } else { | |
118 | hton24(hdr->dlength, ctask->unsol_count); | |
119 | ctask->data_count = ctask->unsol_count; | |
120 | hdr->flags = ISCSI_FLAG_CMD_FINAL; | |
121 | } | |
122 | } | |
123 | EXPORT_SYMBOL_GPL(iscsi_prep_unsolicit_data_pdu); | |
124 | ||
004d6530 BH |
125 | static int iscsi_add_hdr(struct iscsi_cmd_task *ctask, unsigned len) |
126 | { | |
127 | unsigned exp_len = ctask->hdr_len + len; | |
128 | ||
129 | if (exp_len > ctask->hdr_max) { | |
130 | WARN_ON(1); | |
131 | return -EINVAL; | |
132 | } | |
133 | ||
134 | WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */ | |
135 | ctask->hdr_len = exp_len; | |
136 | return 0; | |
137 | } | |
138 | ||
7996a778 MC |
139 | /** |
140 | * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu | |
141 | * @ctask: iscsi cmd task | |
142 | * | |
143 | * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set | |
144 | * fields like dlength or final based on how much data it sends | |
145 | */ | |
004d6530 | 146 | static int iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask) |
7996a778 MC |
147 | { |
148 | struct iscsi_conn *conn = ctask->conn; | |
149 | struct iscsi_session *session = conn->session; | |
150 | struct iscsi_cmd *hdr = ctask->hdr; | |
151 | struct scsi_cmnd *sc = ctask->sc; | |
004d6530 BH |
152 | unsigned hdrlength; |
153 | int rc; | |
7996a778 | 154 | |
004d6530 BH |
155 | ctask->hdr_len = 0; |
156 | rc = iscsi_add_hdr(ctask, sizeof(*hdr)); | |
157 | if (rc) | |
158 | return rc; | |
7996a778 MC |
159 | hdr->opcode = ISCSI_OP_SCSI_CMD; |
160 | hdr->flags = ISCSI_ATTR_SIMPLE; | |
161 | int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun); | |
b4377356 | 162 | hdr->itt = build_itt(ctask->itt, conn->id, session->age); |
1c138991 | 163 | hdr->data_length = cpu_to_be32(scsi_bufflen(sc)); |
7996a778 MC |
164 | hdr->cmdsn = cpu_to_be32(session->cmdsn); |
165 | session->cmdsn++; | |
166 | hdr->exp_statsn = cpu_to_be32(conn->exp_statsn); | |
167 | memcpy(hdr->cdb, sc->cmnd, sc->cmd_len); | |
d473cc7f MC |
168 | if (sc->cmd_len < MAX_COMMAND_SIZE) |
169 | memset(&hdr->cdb[sc->cmd_len], 0, | |
170 | MAX_COMMAND_SIZE - sc->cmd_len); | |
7996a778 | 171 | |
ffd0436e | 172 | ctask->data_count = 0; |
218432c6 | 173 | ctask->imm_count = 0; |
7996a778 MC |
174 | if (sc->sc_data_direction == DMA_TO_DEVICE) { |
175 | hdr->flags |= ISCSI_FLAG_CMD_WRITE; | |
176 | /* | |
177 | * Write counters: | |
178 | * | |
179 | * imm_count bytes to be sent right after | |
180 | * SCSI PDU Header | |
181 | * | |
182 | * unsol_count bytes(as Data-Out) to be sent | |
183 | * without R2T ack right after | |
184 | * immediate data | |
185 | * | |
186 | * r2t_data_count bytes to be sent via R2T ack's | |
187 | * | |
188 | * pad_count bytes to be sent as zero-padding | |
189 | */ | |
7996a778 | 190 | ctask->unsol_count = 0; |
ffd0436e | 191 | ctask->unsol_offset = 0; |
7996a778 MC |
192 | ctask->unsol_datasn = 0; |
193 | ||
194 | if (session->imm_data_en) { | |
1c138991 | 195 | if (scsi_bufflen(sc) >= session->first_burst) |
7996a778 MC |
196 | ctask->imm_count = min(session->first_burst, |
197 | conn->max_xmit_dlength); | |
198 | else | |
1c138991 | 199 | ctask->imm_count = min(scsi_bufflen(sc), |
7996a778 MC |
200 | conn->max_xmit_dlength); |
201 | hton24(ctask->hdr->dlength, ctask->imm_count); | |
202 | } else | |
203 | zero_data(ctask->hdr->dlength); | |
204 | ||
ffd0436e | 205 | if (!session->initial_r2t_en) { |
857ae0bd | 206 | ctask->unsol_count = min((session->first_burst), |
1c138991 | 207 | (scsi_bufflen(sc))) - ctask->imm_count; |
ffd0436e MC |
208 | ctask->unsol_offset = ctask->imm_count; |
209 | } | |
210 | ||
7996a778 MC |
211 | if (!ctask->unsol_count) |
212 | /* No unsolicit Data-Out's */ | |
213 | ctask->hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
214 | } else { | |
7996a778 MC |
215 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; |
216 | zero_data(hdr->dlength); | |
217 | ||
218 | if (sc->sc_data_direction == DMA_FROM_DEVICE) | |
219 | hdr->flags |= ISCSI_FLAG_CMD_READ; | |
220 | } | |
221 | ||
004d6530 BH |
222 | /* calculate size of additional header segments (AHSs) */ |
223 | hdrlength = ctask->hdr_len - sizeof(*hdr); | |
224 | ||
225 | WARN_ON(hdrlength & (ISCSI_PAD_LEN-1)); | |
226 | hdrlength /= ISCSI_PAD_LEN; | |
227 | ||
228 | WARN_ON(hdrlength >= 256); | |
229 | hdr->hlength = hdrlength & 0xFF; | |
230 | ||
7996a778 | 231 | conn->scsicmd_pdus_cnt++; |
77a23c21 MC |
232 | |
233 | debug_scsi("iscsi prep [%s cid %d sc %p cdb 0x%x itt 0x%x len %d " | |
234 | "cmdsn %d win %d]\n", | |
235 | sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read", | |
1c138991 | 236 | conn->id, sc, sc->cmnd[0], ctask->itt, scsi_bufflen(sc), |
77a23c21 | 237 | session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1); |
004d6530 | 238 | return 0; |
7996a778 | 239 | } |
7996a778 MC |
240 | |
241 | /** | |
242 | * iscsi_complete_command - return command back to scsi-ml | |
7996a778 MC |
243 | * @ctask: iscsi cmd task |
244 | * | |
245 | * Must be called with session lock. | |
246 | * This function returns the scsi command to scsi-ml and returns | |
247 | * the cmd task to the pool of available cmd tasks. | |
248 | */ | |
60ecebf5 | 249 | static void iscsi_complete_command(struct iscsi_cmd_task *ctask) |
7996a778 | 250 | { |
60ecebf5 | 251 | struct iscsi_session *session = ctask->conn->session; |
7996a778 MC |
252 | struct scsi_cmnd *sc = ctask->sc; |
253 | ||
b6c395ed | 254 | ctask->state = ISCSI_TASK_COMPLETED; |
7996a778 | 255 | ctask->sc = NULL; |
f47f2cf5 MC |
256 | /* SCSI eh reuses commands to verify us */ |
257 | sc->SCp.ptr = NULL; | |
7996a778 MC |
258 | list_del_init(&ctask->running); |
259 | __kfifo_put(session->cmdpool.queue, (void*)&ctask, sizeof(void*)); | |
260 | sc->scsi_done(sc); | |
261 | } | |
262 | ||
60ecebf5 MC |
263 | static void __iscsi_get_ctask(struct iscsi_cmd_task *ctask) |
264 | { | |
265 | atomic_inc(&ctask->refcount); | |
266 | } | |
267 | ||
60ecebf5 MC |
268 | static void __iscsi_put_ctask(struct iscsi_cmd_task *ctask) |
269 | { | |
e648f63c | 270 | if (atomic_dec_and_test(&ctask->refcount)) |
60ecebf5 | 271 | iscsi_complete_command(ctask); |
60ecebf5 MC |
272 | } |
273 | ||
b3a7ea8d MC |
274 | /* |
275 | * session lock must be held | |
276 | */ | |
277 | static void fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, | |
278 | int err) | |
279 | { | |
280 | struct scsi_cmnd *sc; | |
281 | ||
282 | sc = ctask->sc; | |
283 | if (!sc) | |
284 | return; | |
285 | ||
286 | if (ctask->state == ISCSI_TASK_PENDING) | |
287 | /* | |
288 | * cmd never made it to the xmit thread, so we should not count | |
289 | * the cmd in the sequencing | |
290 | */ | |
291 | conn->session->queued_cmdsn--; | |
292 | else | |
293 | conn->session->tt->cleanup_cmd_task(conn, ctask); | |
294 | ||
295 | sc->result = err; | |
296 | scsi_set_resid(sc, scsi_bufflen(sc)); | |
297 | if (conn->ctask == ctask) | |
298 | conn->ctask = NULL; | |
299 | /* release ref from queuecommand */ | |
300 | __iscsi_put_ctask(ctask); | |
301 | } | |
302 | ||
303 | /** | |
304 | * iscsi_free_mgmt_task - return mgmt task back to pool | |
305 | * @conn: iscsi connection | |
306 | * @mtask: mtask | |
307 | * | |
308 | * Must be called with session lock. | |
309 | */ | |
310 | void iscsi_free_mgmt_task(struct iscsi_conn *conn, | |
311 | struct iscsi_mgmt_task *mtask) | |
312 | { | |
313 | list_del_init(&mtask->running); | |
314 | if (conn->login_mtask == mtask) | |
315 | return; | |
f6d5180c MC |
316 | |
317 | if (conn->ping_mtask == mtask) | |
318 | conn->ping_mtask = NULL; | |
b3a7ea8d MC |
319 | __kfifo_put(conn->session->mgmtpool.queue, |
320 | (void*)&mtask, sizeof(void*)); | |
321 | } | |
322 | EXPORT_SYMBOL_GPL(iscsi_free_mgmt_task); | |
323 | ||
f6d5180c MC |
324 | static struct iscsi_mgmt_task * |
325 | __iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
326 | char *data, uint32_t data_size) | |
327 | { | |
328 | struct iscsi_session *session = conn->session; | |
329 | struct iscsi_mgmt_task *mtask; | |
330 | ||
331 | if (session->state == ISCSI_STATE_TERMINATE) | |
332 | return NULL; | |
333 | ||
334 | if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) || | |
335 | hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE)) | |
336 | /* | |
337 | * Login and Text are sent serially, in | |
338 | * request-followed-by-response sequence. | |
339 | * Same mtask can be used. Same ITT must be used. | |
340 | * Note that login_mtask is preallocated at conn_create(). | |
341 | */ | |
342 | mtask = conn->login_mtask; | |
343 | else { | |
344 | BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE); | |
345 | BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED); | |
346 | ||
347 | if (!__kfifo_get(session->mgmtpool.queue, | |
348 | (void*)&mtask, sizeof(void*))) | |
349 | return NULL; | |
350 | } | |
351 | ||
352 | if (data_size) { | |
353 | memcpy(mtask->data, data, data_size); | |
354 | mtask->data_count = data_size; | |
355 | } else | |
356 | mtask->data_count = 0; | |
357 | ||
358 | memcpy(mtask->hdr, hdr, sizeof(struct iscsi_hdr)); | |
359 | INIT_LIST_HEAD(&mtask->running); | |
360 | list_add_tail(&mtask->running, &conn->mgmtqueue); | |
361 | return mtask; | |
362 | } | |
363 | ||
364 | int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr, | |
365 | char *data, uint32_t data_size) | |
366 | { | |
367 | struct iscsi_conn *conn = cls_conn->dd_data; | |
368 | struct iscsi_session *session = conn->session; | |
369 | int err = 0; | |
370 | ||
371 | spin_lock_bh(&session->lock); | |
372 | if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size)) | |
373 | err = -EPERM; | |
374 | spin_unlock_bh(&session->lock); | |
375 | scsi_queue_work(session->host, &conn->xmitwork); | |
376 | return err; | |
377 | } | |
378 | EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu); | |
379 | ||
7996a778 MC |
380 | /** |
381 | * iscsi_cmd_rsp - SCSI Command Response processing | |
382 | * @conn: iscsi connection | |
383 | * @hdr: iscsi header | |
384 | * @ctask: scsi command task | |
385 | * @data: cmd data buffer | |
386 | * @datalen: len of buffer | |
387 | * | |
388 | * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and | |
389 | * then completes the command and task. | |
390 | **/ | |
77a23c21 MC |
391 | static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
392 | struct iscsi_cmd_task *ctask, char *data, | |
393 | int datalen) | |
7996a778 | 394 | { |
7996a778 MC |
395 | struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)hdr; |
396 | struct iscsi_session *session = conn->session; | |
397 | struct scsi_cmnd *sc = ctask->sc; | |
398 | ||
77a23c21 | 399 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr); |
7996a778 MC |
400 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; |
401 | ||
402 | sc->result = (DID_OK << 16) | rhdr->cmd_status; | |
403 | ||
404 | if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) { | |
405 | sc->result = DID_ERROR << 16; | |
406 | goto out; | |
407 | } | |
408 | ||
409 | if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) { | |
9b80cb4b | 410 | uint16_t senselen; |
7996a778 MC |
411 | |
412 | if (datalen < 2) { | |
413 | invalid_datalen: | |
be2df72e OG |
414 | printk(KERN_ERR "iscsi: Got CHECK_CONDITION but " |
415 | "invalid data buffer size of %d\n", datalen); | |
7996a778 MC |
416 | sc->result = DID_BAD_TARGET << 16; |
417 | goto out; | |
418 | } | |
419 | ||
8eb00539 | 420 | senselen = be16_to_cpu(get_unaligned((__be16 *) data)); |
7996a778 MC |
421 | if (datalen < senselen) |
422 | goto invalid_datalen; | |
423 | ||
424 | memcpy(sc->sense_buffer, data + 2, | |
9b80cb4b | 425 | min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE)); |
7996a778 | 426 | debug_scsi("copied %d bytes of sense\n", |
8eb00539 | 427 | min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE)); |
7996a778 MC |
428 | } |
429 | ||
7207fea4 BH |
430 | if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW | |
431 | ISCSI_FLAG_CMD_OVERFLOW)) { | |
7996a778 MC |
432 | int res_count = be32_to_cpu(rhdr->residual_count); |
433 | ||
7207fea4 BH |
434 | if (res_count > 0 && |
435 | (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || | |
436 | res_count <= scsi_bufflen(sc))) | |
1c138991 | 437 | scsi_set_resid(sc, res_count); |
7996a778 MC |
438 | else |
439 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
7207fea4 BH |
440 | } else if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW | |
441 | ISCSI_FLAG_CMD_BIDI_OVERFLOW)) | |
7996a778 | 442 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; |
7996a778 MC |
443 | |
444 | out: | |
445 | debug_scsi("done [sc %lx res %d itt 0x%x]\n", | |
446 | (long)sc, sc->result, ctask->itt); | |
447 | conn->scsirsp_pdus_cnt++; | |
448 | ||
60ecebf5 | 449 | __iscsi_put_ctask(ctask); |
7996a778 MC |
450 | } |
451 | ||
7ea8b828 MC |
452 | static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr) |
453 | { | |
454 | struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr; | |
455 | ||
456 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
457 | conn->tmfrsp_pdus_cnt++; | |
458 | ||
843c0a8a | 459 | if (conn->tmf_state != TMF_QUEUED) |
7ea8b828 MC |
460 | return; |
461 | ||
462 | if (tmf->response == ISCSI_TMF_RSP_COMPLETE) | |
843c0a8a | 463 | conn->tmf_state = TMF_SUCCESS; |
7ea8b828 | 464 | else if (tmf->response == ISCSI_TMF_RSP_NO_TASK) |
843c0a8a | 465 | conn->tmf_state = TMF_NOT_FOUND; |
7ea8b828 | 466 | else |
843c0a8a | 467 | conn->tmf_state = TMF_FAILED; |
7ea8b828 MC |
468 | wake_up(&conn->ehwait); |
469 | } | |
470 | ||
f6d5180c MC |
471 | static void iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr) |
472 | { | |
473 | struct iscsi_nopout hdr; | |
474 | struct iscsi_mgmt_task *mtask; | |
475 | ||
476 | if (!rhdr && conn->ping_mtask) | |
477 | return; | |
478 | ||
479 | memset(&hdr, 0, sizeof(struct iscsi_nopout)); | |
480 | hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE; | |
481 | hdr.flags = ISCSI_FLAG_CMD_FINAL; | |
482 | ||
483 | if (rhdr) { | |
484 | memcpy(hdr.lun, rhdr->lun, 8); | |
485 | hdr.ttt = rhdr->ttt; | |
486 | hdr.itt = RESERVED_ITT; | |
487 | } else | |
488 | hdr.ttt = RESERVED_ITT; | |
489 | ||
490 | mtask = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0); | |
491 | if (!mtask) { | |
492 | printk(KERN_ERR "Could not send nopout\n"); | |
493 | return; | |
494 | } | |
495 | ||
496 | /* only track our nops */ | |
497 | if (!rhdr) { | |
498 | conn->ping_mtask = mtask; | |
499 | conn->last_ping = jiffies; | |
500 | } | |
501 | scsi_queue_work(conn->session->host, &conn->xmitwork); | |
502 | } | |
503 | ||
62f38300 MC |
504 | static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
505 | char *data, int datalen) | |
506 | { | |
507 | struct iscsi_reject *reject = (struct iscsi_reject *)hdr; | |
508 | struct iscsi_hdr rejected_pdu; | |
509 | uint32_t itt; | |
510 | ||
511 | conn->exp_statsn = be32_to_cpu(reject->statsn) + 1; | |
512 | ||
513 | if (reject->reason == ISCSI_REASON_DATA_DIGEST_ERROR) { | |
514 | if (ntoh24(reject->dlength) > datalen) | |
515 | return ISCSI_ERR_PROTO; | |
516 | ||
517 | if (ntoh24(reject->dlength) >= sizeof(struct iscsi_hdr)) { | |
518 | memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr)); | |
b4377356 | 519 | itt = get_itt(rejected_pdu.itt); |
62f38300 MC |
520 | printk(KERN_ERR "itt 0x%x had pdu (op 0x%x) rejected " |
521 | "due to DataDigest error.\n", itt, | |
522 | rejected_pdu.opcode); | |
523 | } | |
524 | } | |
525 | return 0; | |
526 | } | |
527 | ||
7996a778 MC |
528 | /** |
529 | * __iscsi_complete_pdu - complete pdu | |
530 | * @conn: iscsi conn | |
531 | * @hdr: iscsi header | |
532 | * @data: data buffer | |
533 | * @datalen: len of data buffer | |
534 | * | |
535 | * Completes pdu processing by freeing any resources allocated at | |
536 | * queuecommand or send generic. session lock must be held and verify | |
537 | * itt must have been called. | |
538 | */ | |
539 | int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
540 | char *data, int datalen) | |
541 | { | |
542 | struct iscsi_session *session = conn->session; | |
543 | int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0; | |
544 | struct iscsi_cmd_task *ctask; | |
545 | struct iscsi_mgmt_task *mtask; | |
546 | uint32_t itt; | |
547 | ||
f6d5180c | 548 | conn->last_recv = jiffies; |
b4377356 AV |
549 | if (hdr->itt != RESERVED_ITT) |
550 | itt = get_itt(hdr->itt); | |
7996a778 | 551 | else |
b4377356 | 552 | itt = ~0U; |
7996a778 MC |
553 | |
554 | if (itt < session->cmds_max) { | |
555 | ctask = session->cmds[itt]; | |
556 | ||
557 | debug_scsi("cmdrsp [op 0x%x cid %d itt 0x%x len %d]\n", | |
558 | opcode, conn->id, ctask->itt, datalen); | |
559 | ||
560 | switch(opcode) { | |
561 | case ISCSI_OP_SCSI_CMD_RSP: | |
562 | BUG_ON((void*)ctask != ctask->sc->SCp.ptr); | |
77a23c21 MC |
563 | iscsi_scsi_cmd_rsp(conn, hdr, ctask, data, |
564 | datalen); | |
7996a778 MC |
565 | break; |
566 | case ISCSI_OP_SCSI_DATA_IN: | |
567 | BUG_ON((void*)ctask != ctask->sc->SCp.ptr); | |
568 | if (hdr->flags & ISCSI_FLAG_DATA_STATUS) { | |
569 | conn->scsirsp_pdus_cnt++; | |
60ecebf5 | 570 | __iscsi_put_ctask(ctask); |
7996a778 MC |
571 | } |
572 | break; | |
573 | case ISCSI_OP_R2T: | |
574 | /* LLD handles this for now */ | |
575 | break; | |
576 | default: | |
577 | rc = ISCSI_ERR_BAD_OPCODE; | |
578 | break; | |
579 | } | |
580 | } else if (itt >= ISCSI_MGMT_ITT_OFFSET && | |
581 | itt < ISCSI_MGMT_ITT_OFFSET + session->mgmtpool_max) { | |
582 | mtask = session->mgmt_cmds[itt - ISCSI_MGMT_ITT_OFFSET]; | |
583 | ||
584 | debug_scsi("immrsp [op 0x%x cid %d itt 0x%x len %d]\n", | |
585 | opcode, conn->id, mtask->itt, datalen); | |
586 | ||
77a23c21 | 587 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); |
7996a778 | 588 | switch(opcode) { |
8d2860b3 | 589 | case ISCSI_OP_LOGOUT_RSP: |
c8dc1e52 MC |
590 | if (datalen) { |
591 | rc = ISCSI_ERR_PROTO; | |
592 | break; | |
593 | } | |
8d2860b3 MC |
594 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; |
595 | /* fall through */ | |
7996a778 MC |
596 | case ISCSI_OP_LOGIN_RSP: |
597 | case ISCSI_OP_TEXT_RSP: | |
8d2860b3 MC |
598 | /* |
599 | * login related PDU's exp_statsn is handled in | |
600 | * userspace | |
601 | */ | |
40527afe MC |
602 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) |
603 | rc = ISCSI_ERR_CONN_FAILED; | |
b3a7ea8d | 604 | iscsi_free_mgmt_task(conn, mtask); |
7996a778 MC |
605 | break; |
606 | case ISCSI_OP_SCSI_TMFUNC_RSP: | |
7996a778 MC |
607 | if (datalen) { |
608 | rc = ISCSI_ERR_PROTO; | |
609 | break; | |
610 | } | |
8d2860b3 | 611 | |
7ea8b828 | 612 | iscsi_tmf_rsp(conn, hdr); |
b3a7ea8d | 613 | iscsi_free_mgmt_task(conn, mtask); |
7996a778 MC |
614 | break; |
615 | case ISCSI_OP_NOOP_IN: | |
f6d5180c MC |
616 | if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || |
617 | datalen) { | |
7996a778 MC |
618 | rc = ISCSI_ERR_PROTO; |
619 | break; | |
620 | } | |
7996a778 MC |
621 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; |
622 | ||
f6d5180c MC |
623 | if (conn->ping_mtask != mtask) { |
624 | /* | |
625 | * If this is not in response to one of our | |
626 | * nops then it must be from userspace. | |
627 | */ | |
628 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, | |
629 | datalen)) | |
630 | rc = ISCSI_ERR_CONN_FAILED; | |
631 | } | |
b3a7ea8d | 632 | iscsi_free_mgmt_task(conn, mtask); |
7996a778 MC |
633 | break; |
634 | default: | |
635 | rc = ISCSI_ERR_BAD_OPCODE; | |
636 | break; | |
637 | } | |
b4377356 | 638 | } else if (itt == ~0U) { |
77a23c21 | 639 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); |
62f38300 | 640 | |
7996a778 MC |
641 | switch(opcode) { |
642 | case ISCSI_OP_NOOP_IN: | |
40527afe | 643 | if (datalen) { |
7996a778 | 644 | rc = ISCSI_ERR_PROTO; |
40527afe MC |
645 | break; |
646 | } | |
647 | ||
b4377356 | 648 | if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG)) |
40527afe MC |
649 | break; |
650 | ||
f6d5180c | 651 | iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr); |
7996a778 MC |
652 | break; |
653 | case ISCSI_OP_REJECT: | |
62f38300 MC |
654 | rc = iscsi_handle_reject(conn, hdr, data, datalen); |
655 | break; | |
7996a778 | 656 | case ISCSI_OP_ASYNC_EVENT: |
8d2860b3 | 657 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; |
5831c737 MC |
658 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) |
659 | rc = ISCSI_ERR_CONN_FAILED; | |
7996a778 MC |
660 | break; |
661 | default: | |
662 | rc = ISCSI_ERR_BAD_OPCODE; | |
663 | break; | |
664 | } | |
665 | } else | |
666 | rc = ISCSI_ERR_BAD_ITT; | |
667 | ||
668 | return rc; | |
669 | } | |
670 | EXPORT_SYMBOL_GPL(__iscsi_complete_pdu); | |
671 | ||
672 | int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
673 | char *data, int datalen) | |
674 | { | |
675 | int rc; | |
676 | ||
677 | spin_lock(&conn->session->lock); | |
678 | rc = __iscsi_complete_pdu(conn, hdr, data, datalen); | |
679 | spin_unlock(&conn->session->lock); | |
680 | return rc; | |
681 | } | |
682 | EXPORT_SYMBOL_GPL(iscsi_complete_pdu); | |
683 | ||
684 | /* verify itt (itt encoding: age+cid+itt) */ | |
685 | int iscsi_verify_itt(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
686 | uint32_t *ret_itt) | |
687 | { | |
688 | struct iscsi_session *session = conn->session; | |
689 | struct iscsi_cmd_task *ctask; | |
690 | uint32_t itt; | |
691 | ||
b4377356 AV |
692 | if (hdr->itt != RESERVED_ITT) { |
693 | if (((__force u32)hdr->itt & ISCSI_AGE_MASK) != | |
7996a778 | 694 | (session->age << ISCSI_AGE_SHIFT)) { |
be2df72e | 695 | printk(KERN_ERR "iscsi: received itt %x expected " |
b4377356 | 696 | "session age (%x)\n", (__force u32)hdr->itt, |
7996a778 MC |
697 | session->age & ISCSI_AGE_MASK); |
698 | return ISCSI_ERR_BAD_ITT; | |
699 | } | |
700 | ||
b4377356 | 701 | if (((__force u32)hdr->itt & ISCSI_CID_MASK) != |
7996a778 | 702 | (conn->id << ISCSI_CID_SHIFT)) { |
be2df72e | 703 | printk(KERN_ERR "iscsi: received itt %x, expected " |
b4377356 | 704 | "CID (%x)\n", (__force u32)hdr->itt, conn->id); |
7996a778 MC |
705 | return ISCSI_ERR_BAD_ITT; |
706 | } | |
b4377356 | 707 | itt = get_itt(hdr->itt); |
7996a778 | 708 | } else |
b4377356 | 709 | itt = ~0U; |
7996a778 MC |
710 | |
711 | if (itt < session->cmds_max) { | |
712 | ctask = session->cmds[itt]; | |
713 | ||
714 | if (!ctask->sc) { | |
be2df72e | 715 | printk(KERN_INFO "iscsi: dropping ctask with " |
7996a778 MC |
716 | "itt 0x%x\n", ctask->itt); |
717 | /* force drop */ | |
718 | return ISCSI_ERR_NO_SCSI_CMD; | |
719 | } | |
720 | ||
721 | if (ctask->sc->SCp.phase != session->age) { | |
be2df72e | 722 | printk(KERN_ERR "iscsi: ctask's session age %d, " |
7996a778 MC |
723 | "expected %d\n", ctask->sc->SCp.phase, |
724 | session->age); | |
725 | return ISCSI_ERR_SESSION_FAILED; | |
726 | } | |
727 | } | |
728 | ||
729 | *ret_itt = itt; | |
730 | return 0; | |
731 | } | |
732 | EXPORT_SYMBOL_GPL(iscsi_verify_itt); | |
733 | ||
734 | void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err) | |
735 | { | |
736 | struct iscsi_session *session = conn->session; | |
737 | unsigned long flags; | |
738 | ||
739 | spin_lock_irqsave(&session->lock, flags); | |
656cffc9 MC |
740 | if (session->state == ISCSI_STATE_FAILED) { |
741 | spin_unlock_irqrestore(&session->lock, flags); | |
742 | return; | |
743 | } | |
744 | ||
67a61114 | 745 | if (conn->stop_stage == 0) |
7996a778 MC |
746 | session->state = ISCSI_STATE_FAILED; |
747 | spin_unlock_irqrestore(&session->lock, flags); | |
748 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
749 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
750 | iscsi_conn_error(conn->cls_conn, err); | |
751 | } | |
752 | EXPORT_SYMBOL_GPL(iscsi_conn_failure); | |
753 | ||
77a23c21 MC |
754 | static void iscsi_prep_mtask(struct iscsi_conn *conn, |
755 | struct iscsi_mgmt_task *mtask) | |
756 | { | |
757 | struct iscsi_session *session = conn->session; | |
758 | struct iscsi_hdr *hdr = mtask->hdr; | |
759 | struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr; | |
760 | ||
761 | if (hdr->opcode != (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) && | |
762 | hdr->opcode != (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE)) | |
763 | nop->exp_statsn = cpu_to_be32(conn->exp_statsn); | |
764 | /* | |
765 | * pre-format CmdSN for outgoing PDU. | |
766 | */ | |
767 | nop->cmdsn = cpu_to_be32(session->cmdsn); | |
768 | if (hdr->itt != RESERVED_ITT) { | |
769 | hdr->itt = build_itt(mtask->itt, conn->id, session->age); | |
e0726407 MC |
770 | /* |
771 | * TODO: We always use immediate, so we never hit this. | |
772 | * If we start to send tmfs or nops as non-immediate then | |
773 | * we should start checking the cmdsn numbers for mgmt tasks. | |
774 | */ | |
77a23c21 | 775 | if (conn->c_stage == ISCSI_CONN_STARTED && |
e0726407 MC |
776 | !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { |
777 | session->queued_cmdsn++; | |
77a23c21 | 778 | session->cmdsn++; |
e0726407 | 779 | } |
77a23c21 MC |
780 | } |
781 | ||
782 | if (session->tt->init_mgmt_task) | |
783 | session->tt->init_mgmt_task(conn, mtask); | |
784 | ||
785 | debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n", | |
843c0a8a MC |
786 | hdr->opcode & ISCSI_OPCODE_MASK, hdr->itt, |
787 | mtask->data_count); | |
77a23c21 MC |
788 | } |
789 | ||
05db888a | 790 | static int iscsi_xmit_mtask(struct iscsi_conn *conn) |
b5072ea0 MC |
791 | { |
792 | struct iscsi_hdr *hdr = conn->mtask->hdr; | |
b3a7ea8d | 793 | int rc; |
b5072ea0 | 794 | |
b3a7ea8d MC |
795 | if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT) |
796 | conn->session->state = ISCSI_STATE_LOGGING_OUT; | |
77a23c21 | 797 | spin_unlock_bh(&conn->session->lock); |
b3a7ea8d | 798 | |
b5072ea0 | 799 | rc = conn->session->tt->xmit_mgmt_task(conn, conn->mtask); |
77a23c21 | 800 | spin_lock_bh(&conn->session->lock); |
b5072ea0 MC |
801 | if (rc) |
802 | return rc; | |
803 | ||
05db888a MC |
804 | /* done with this in-progress mtask */ |
805 | conn->mtask = NULL; | |
b5072ea0 MC |
806 | return 0; |
807 | } | |
808 | ||
77a23c21 MC |
809 | static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn) |
810 | { | |
811 | struct iscsi_session *session = conn->session; | |
812 | ||
813 | /* | |
814 | * Check for iSCSI window and take care of CmdSN wrap-around | |
815 | */ | |
e0726407 MC |
816 | if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) { |
817 | debug_scsi("iSCSI CmdSN closed. ExpCmdSn %u MaxCmdSN %u " | |
818 | "CmdSN %u/%u\n", session->exp_cmdsn, | |
819 | session->max_cmdsn, session->cmdsn, | |
820 | session->queued_cmdsn); | |
77a23c21 MC |
821 | return -ENOSPC; |
822 | } | |
823 | return 0; | |
824 | } | |
825 | ||
826 | static int iscsi_xmit_ctask(struct iscsi_conn *conn) | |
827 | { | |
828 | struct iscsi_cmd_task *ctask = conn->ctask; | |
843c0a8a | 829 | int rc; |
77a23c21 MC |
830 | |
831 | __iscsi_get_ctask(ctask); | |
832 | spin_unlock_bh(&conn->session->lock); | |
833 | rc = conn->session->tt->xmit_cmd_task(conn, ctask); | |
834 | spin_lock_bh(&conn->session->lock); | |
835 | __iscsi_put_ctask(ctask); | |
77a23c21 MC |
836 | if (!rc) |
837 | /* done with this ctask */ | |
838 | conn->ctask = NULL; | |
839 | return rc; | |
840 | } | |
841 | ||
843c0a8a MC |
842 | /** |
843 | * iscsi_requeue_ctask - requeue ctask to run from session workqueue | |
844 | * @ctask: ctask to requeue | |
845 | * | |
846 | * LLDs that need to run a ctask from the session workqueue should call | |
847 | * this. The session lock must be held. | |
848 | */ | |
849 | void iscsi_requeue_ctask(struct iscsi_cmd_task *ctask) | |
850 | { | |
851 | struct iscsi_conn *conn = ctask->conn; | |
852 | ||
853 | list_move_tail(&ctask->running, &conn->requeue); | |
854 | scsi_queue_work(conn->session->host, &conn->xmitwork); | |
855 | } | |
856 | EXPORT_SYMBOL_GPL(iscsi_requeue_ctask); | |
857 | ||
7996a778 MC |
858 | /** |
859 | * iscsi_data_xmit - xmit any command into the scheduled connection | |
860 | * @conn: iscsi connection | |
861 | * | |
862 | * Notes: | |
863 | * The function can return -EAGAIN in which case the caller must | |
864 | * re-schedule it again later or recover. '0' return code means | |
865 | * successful xmit. | |
866 | **/ | |
867 | static int iscsi_data_xmit(struct iscsi_conn *conn) | |
868 | { | |
3219e529 | 869 | int rc = 0; |
7996a778 | 870 | |
77a23c21 | 871 | spin_lock_bh(&conn->session->lock); |
7996a778 MC |
872 | if (unlikely(conn->suspend_tx)) { |
873 | debug_scsi("conn %d Tx suspended!\n", conn->id); | |
77a23c21 | 874 | spin_unlock_bh(&conn->session->lock); |
3219e529 | 875 | return -ENODATA; |
7996a778 | 876 | } |
7996a778 MC |
877 | |
878 | if (conn->ctask) { | |
77a23c21 | 879 | rc = iscsi_xmit_ctask(conn); |
3219e529 | 880 | if (rc) |
7996a778 | 881 | goto again; |
7996a778 | 882 | } |
77a23c21 | 883 | |
7996a778 | 884 | if (conn->mtask) { |
05db888a | 885 | rc = iscsi_xmit_mtask(conn); |
3219e529 | 886 | if (rc) |
7996a778 | 887 | goto again; |
7996a778 MC |
888 | } |
889 | ||
77a23c21 MC |
890 | /* |
891 | * process mgmt pdus like nops before commands since we should | |
892 | * only have one nop-out as a ping from us and targets should not | |
893 | * overflow us with nop-ins | |
894 | */ | |
895 | check_mgmt: | |
843c0a8a MC |
896 | while (!list_empty(&conn->mgmtqueue)) { |
897 | conn->mtask = list_entry(conn->mgmtqueue.next, | |
898 | struct iscsi_mgmt_task, running); | |
b3a7ea8d MC |
899 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) { |
900 | iscsi_free_mgmt_task(conn, conn->mtask); | |
901 | conn->mtask = NULL; | |
902 | continue; | |
903 | } | |
904 | ||
77a23c21 | 905 | iscsi_prep_mtask(conn, conn->mtask); |
843c0a8a | 906 | list_move_tail(conn->mgmtqueue.next, &conn->mgmt_run_list); |
77a23c21 MC |
907 | rc = iscsi_xmit_mtask(conn); |
908 | if (rc) | |
909 | goto again; | |
7996a778 MC |
910 | } |
911 | ||
843c0a8a | 912 | /* process pending command queue */ |
b6c395ed | 913 | while (!list_empty(&conn->xmitqueue)) { |
843c0a8a MC |
914 | if (conn->tmf_state == TMF_QUEUED) |
915 | break; | |
916 | ||
b6c395ed MC |
917 | conn->ctask = list_entry(conn->xmitqueue.next, |
918 | struct iscsi_cmd_task, running); | |
b3a7ea8d | 919 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) { |
9000bcd6 | 920 | fail_command(conn, conn->ctask, DID_IMM_RETRY << 16); |
b3a7ea8d MC |
921 | continue; |
922 | } | |
004d6530 BH |
923 | if (iscsi_prep_scsi_cmd_pdu(conn->ctask)) { |
924 | fail_command(conn, conn->ctask, DID_ABORT << 16); | |
925 | continue; | |
926 | } | |
843c0a8a MC |
927 | conn->session->tt->init_cmd_task(conn->ctask); |
928 | conn->ctask->state = ISCSI_TASK_RUNNING; | |
b6c395ed | 929 | list_move_tail(conn->xmitqueue.next, &conn->run_list); |
77a23c21 MC |
930 | rc = iscsi_xmit_ctask(conn); |
931 | if (rc) | |
60ecebf5 | 932 | goto again; |
77a23c21 MC |
933 | /* |
934 | * we could continuously get new ctask requests so | |
935 | * we need to check the mgmt queue for nops that need to | |
936 | * be sent to aviod starvation | |
937 | */ | |
843c0a8a MC |
938 | if (!list_empty(&conn->mgmtqueue)) |
939 | goto check_mgmt; | |
940 | } | |
941 | ||
942 | while (!list_empty(&conn->requeue)) { | |
943 | if (conn->session->fast_abort && conn->tmf_state != TMF_INITIAL) | |
944 | break; | |
945 | ||
b3a7ea8d MC |
946 | /* |
947 | * we always do fastlogout - conn stop code will clean up. | |
948 | */ | |
949 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) | |
950 | break; | |
951 | ||
843c0a8a MC |
952 | conn->ctask = list_entry(conn->requeue.next, |
953 | struct iscsi_cmd_task, running); | |
954 | conn->ctask->state = ISCSI_TASK_RUNNING; | |
955 | list_move_tail(conn->requeue.next, &conn->run_list); | |
956 | rc = iscsi_xmit_ctask(conn); | |
957 | if (rc) | |
958 | goto again; | |
959 | if (!list_empty(&conn->mgmtqueue)) | |
77a23c21 | 960 | goto check_mgmt; |
7996a778 | 961 | } |
b6c395ed | 962 | spin_unlock_bh(&conn->session->lock); |
3219e529 | 963 | return -ENODATA; |
7996a778 MC |
964 | |
965 | again: | |
966 | if (unlikely(conn->suspend_tx)) | |
77a23c21 MC |
967 | rc = -ENODATA; |
968 | spin_unlock_bh(&conn->session->lock); | |
3219e529 | 969 | return rc; |
7996a778 MC |
970 | } |
971 | ||
c4028958 | 972 | static void iscsi_xmitworker(struct work_struct *work) |
7996a778 | 973 | { |
c4028958 DH |
974 | struct iscsi_conn *conn = |
975 | container_of(work, struct iscsi_conn, xmitwork); | |
3219e529 | 976 | int rc; |
7996a778 MC |
977 | /* |
978 | * serialize Xmit worker on a per-connection basis. | |
979 | */ | |
3219e529 MC |
980 | do { |
981 | rc = iscsi_data_xmit(conn); | |
982 | } while (rc >= 0 || rc == -EAGAIN); | |
7996a778 MC |
983 | } |
984 | ||
985 | enum { | |
986 | FAILURE_BAD_HOST = 1, | |
987 | FAILURE_SESSION_FAILED, | |
988 | FAILURE_SESSION_FREED, | |
989 | FAILURE_WINDOW_CLOSED, | |
60ecebf5 | 990 | FAILURE_OOM, |
7996a778 | 991 | FAILURE_SESSION_TERMINATE, |
656cffc9 | 992 | FAILURE_SESSION_IN_RECOVERY, |
7996a778 | 993 | FAILURE_SESSION_RECOVERY_TIMEOUT, |
b3a7ea8d | 994 | FAILURE_SESSION_LOGGING_OUT, |
7996a778 MC |
995 | }; |
996 | ||
997 | int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *)) | |
998 | { | |
999 | struct Scsi_Host *host; | |
1000 | int reason = 0; | |
1001 | struct iscsi_session *session; | |
1002 | struct iscsi_conn *conn; | |
1003 | struct iscsi_cmd_task *ctask = NULL; | |
1004 | ||
1005 | sc->scsi_done = done; | |
1006 | sc->result = 0; | |
f47f2cf5 | 1007 | sc->SCp.ptr = NULL; |
7996a778 MC |
1008 | |
1009 | host = sc->device->host; | |
1010 | session = iscsi_hostdata(host->hostdata); | |
1011 | ||
1012 | spin_lock(&session->lock); | |
1013 | ||
656cffc9 MC |
1014 | /* |
1015 | * ISCSI_STATE_FAILED is a temp. state. The recovery | |
1016 | * code will decide what is best to do with command queued | |
1017 | * during this time | |
1018 | */ | |
1019 | if (session->state != ISCSI_STATE_LOGGED_IN && | |
1020 | session->state != ISCSI_STATE_FAILED) { | |
1021 | /* | |
1022 | * to handle the race between when we set the recovery state | |
1023 | * and block the session we requeue here (commands could | |
1024 | * be entering our queuecommand while a block is starting | |
1025 | * up because the block code is not locked) | |
1026 | */ | |
9000bcd6 MC |
1027 | switch (session->state) { |
1028 | case ISCSI_STATE_IN_RECOVERY: | |
656cffc9 | 1029 | reason = FAILURE_SESSION_IN_RECOVERY; |
67a61114 | 1030 | goto reject; |
9000bcd6 MC |
1031 | case ISCSI_STATE_LOGGING_OUT: |
1032 | reason = FAILURE_SESSION_LOGGING_OUT; | |
1033 | goto reject; | |
b3a7ea8d | 1034 | case ISCSI_STATE_RECOVERY_FAILED: |
656cffc9 | 1035 | reason = FAILURE_SESSION_RECOVERY_TIMEOUT; |
b3a7ea8d MC |
1036 | break; |
1037 | case ISCSI_STATE_TERMINATE: | |
656cffc9 | 1038 | reason = FAILURE_SESSION_TERMINATE; |
b3a7ea8d | 1039 | break; |
b3a7ea8d | 1040 | default: |
656cffc9 | 1041 | reason = FAILURE_SESSION_FREED; |
b3a7ea8d | 1042 | } |
7996a778 MC |
1043 | goto fault; |
1044 | } | |
1045 | ||
7996a778 | 1046 | conn = session->leadconn; |
98644047 MC |
1047 | if (!conn) { |
1048 | reason = FAILURE_SESSION_FREED; | |
1049 | goto fault; | |
1050 | } | |
7996a778 | 1051 | |
77a23c21 MC |
1052 | if (iscsi_check_cmdsn_window_closed(conn)) { |
1053 | reason = FAILURE_WINDOW_CLOSED; | |
1054 | goto reject; | |
1055 | } | |
1056 | ||
60ecebf5 MC |
1057 | if (!__kfifo_get(session->cmdpool.queue, (void*)&ctask, |
1058 | sizeof(void*))) { | |
1059 | reason = FAILURE_OOM; | |
1060 | goto reject; | |
1061 | } | |
e0726407 MC |
1062 | session->queued_cmdsn++; |
1063 | ||
7996a778 MC |
1064 | sc->SCp.phase = session->age; |
1065 | sc->SCp.ptr = (char *)ctask; | |
1066 | ||
60ecebf5 | 1067 | atomic_set(&ctask->refcount, 1); |
b6c395ed | 1068 | ctask->state = ISCSI_TASK_PENDING; |
7996a778 MC |
1069 | ctask->conn = conn; |
1070 | ctask->sc = sc; | |
1071 | INIT_LIST_HEAD(&ctask->running); | |
7996a778 | 1072 | |
b6c395ed | 1073 | list_add_tail(&ctask->running, &conn->xmitqueue); |
7996a778 MC |
1074 | spin_unlock(&session->lock); |
1075 | ||
1076 | scsi_queue_work(host, &conn->xmitwork); | |
1077 | return 0; | |
1078 | ||
1079 | reject: | |
1080 | spin_unlock(&session->lock); | |
1081 | debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason); | |
1082 | return SCSI_MLQUEUE_HOST_BUSY; | |
1083 | ||
1084 | fault: | |
1085 | spin_unlock(&session->lock); | |
be2df72e | 1086 | printk(KERN_ERR "iscsi: cmd 0x%x is not queued (%d)\n", |
7996a778 MC |
1087 | sc->cmnd[0], reason); |
1088 | sc->result = (DID_NO_CONNECT << 16); | |
1c138991 | 1089 | scsi_set_resid(sc, scsi_bufflen(sc)); |
7996a778 MC |
1090 | sc->scsi_done(sc); |
1091 | return 0; | |
1092 | } | |
1093 | EXPORT_SYMBOL_GPL(iscsi_queuecommand); | |
1094 | ||
1095 | int iscsi_change_queue_depth(struct scsi_device *sdev, int depth) | |
1096 | { | |
1097 | if (depth > ISCSI_MAX_CMD_PER_LUN) | |
1098 | depth = ISCSI_MAX_CMD_PER_LUN; | |
1099 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); | |
1100 | return sdev->queue_depth; | |
1101 | } | |
1102 | EXPORT_SYMBOL_GPL(iscsi_change_queue_depth); | |
1103 | ||
7996a778 MC |
1104 | void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session) |
1105 | { | |
1106 | struct iscsi_session *session = class_to_transport_session(cls_session); | |
7996a778 MC |
1107 | |
1108 | spin_lock_bh(&session->lock); | |
1109 | if (session->state != ISCSI_STATE_LOGGED_IN) { | |
656cffc9 | 1110 | session->state = ISCSI_STATE_RECOVERY_FAILED; |
843c0a8a MC |
1111 | if (session->leadconn) |
1112 | wake_up(&session->leadconn->ehwait); | |
7996a778 MC |
1113 | } |
1114 | spin_unlock_bh(&session->lock); | |
1115 | } | |
1116 | EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout); | |
1117 | ||
1118 | int iscsi_eh_host_reset(struct scsi_cmnd *sc) | |
1119 | { | |
1120 | struct Scsi_Host *host = sc->device->host; | |
1121 | struct iscsi_session *session = iscsi_hostdata(host->hostdata); | |
1122 | struct iscsi_conn *conn = session->leadconn; | |
7996a778 | 1123 | |
bc436b27 | 1124 | mutex_lock(&session->eh_mutex); |
7996a778 MC |
1125 | spin_lock_bh(&session->lock); |
1126 | if (session->state == ISCSI_STATE_TERMINATE) { | |
1127 | failed: | |
1128 | debug_scsi("failing host reset: session terminated " | |
d6e24d1c | 1129 | "[CID %d age %d]\n", conn->id, session->age); |
7996a778 | 1130 | spin_unlock_bh(&session->lock); |
bc436b27 | 1131 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1132 | return FAILED; |
1133 | } | |
1134 | ||
7996a778 | 1135 | spin_unlock_bh(&session->lock); |
bc436b27 | 1136 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1137 | /* |
1138 | * we drop the lock here but the leadconn cannot be destoyed while | |
1139 | * we are in the scsi eh | |
1140 | */ | |
843c0a8a | 1141 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
7996a778 MC |
1142 | |
1143 | debug_scsi("iscsi_eh_host_reset wait for relogin\n"); | |
1144 | wait_event_interruptible(conn->ehwait, | |
1145 | session->state == ISCSI_STATE_TERMINATE || | |
1146 | session->state == ISCSI_STATE_LOGGED_IN || | |
656cffc9 | 1147 | session->state == ISCSI_STATE_RECOVERY_FAILED); |
7996a778 MC |
1148 | if (signal_pending(current)) |
1149 | flush_signals(current); | |
1150 | ||
bc436b27 | 1151 | mutex_lock(&session->eh_mutex); |
7996a778 MC |
1152 | spin_lock_bh(&session->lock); |
1153 | if (session->state == ISCSI_STATE_LOGGED_IN) | |
be2df72e | 1154 | printk(KERN_INFO "iscsi: host reset succeeded\n"); |
7996a778 MC |
1155 | else |
1156 | goto failed; | |
1157 | spin_unlock_bh(&session->lock); | |
bc436b27 | 1158 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1159 | return SUCCESS; |
1160 | } | |
1161 | EXPORT_SYMBOL_GPL(iscsi_eh_host_reset); | |
1162 | ||
843c0a8a | 1163 | static void iscsi_tmf_timedout(unsigned long data) |
7996a778 | 1164 | { |
843c0a8a | 1165 | struct iscsi_conn *conn = (struct iscsi_conn *)data; |
7996a778 MC |
1166 | struct iscsi_session *session = conn->session; |
1167 | ||
1168 | spin_lock(&session->lock); | |
843c0a8a MC |
1169 | if (conn->tmf_state == TMF_QUEUED) { |
1170 | conn->tmf_state = TMF_TIMEDOUT; | |
1171 | debug_scsi("tmf timedout\n"); | |
7996a778 MC |
1172 | /* unblock eh_abort() */ |
1173 | wake_up(&conn->ehwait); | |
1174 | } | |
1175 | spin_unlock(&session->lock); | |
1176 | } | |
1177 | ||
843c0a8a | 1178 | static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn, |
f6d5180c MC |
1179 | struct iscsi_tm *hdr, int age, |
1180 | int timeout) | |
7996a778 | 1181 | { |
7996a778 | 1182 | struct iscsi_session *session = conn->session; |
843c0a8a | 1183 | struct iscsi_mgmt_task *mtask; |
7996a778 | 1184 | |
843c0a8a MC |
1185 | mtask = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr, |
1186 | NULL, 0); | |
1187 | if (!mtask) { | |
6724add1 | 1188 | spin_unlock_bh(&session->lock); |
7996a778 | 1189 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
843c0a8a MC |
1190 | spin_lock_bh(&session->lock); |
1191 | debug_scsi("tmf exec failure\n"); | |
77a23c21 | 1192 | return -EPERM; |
7996a778 | 1193 | } |
843c0a8a | 1194 | conn->tmfcmd_pdus_cnt++; |
f6d5180c | 1195 | conn->tmf_timer.expires = timeout * HZ + jiffies; |
843c0a8a MC |
1196 | conn->tmf_timer.function = iscsi_tmf_timedout; |
1197 | conn->tmf_timer.data = (unsigned long)conn; | |
1198 | add_timer(&conn->tmf_timer); | |
1199 | debug_scsi("tmf set timeout\n"); | |
7996a778 | 1200 | |
7996a778 | 1201 | spin_unlock_bh(&session->lock); |
6724add1 | 1202 | mutex_unlock(&session->eh_mutex); |
77a23c21 | 1203 | scsi_queue_work(session->host, &conn->xmitwork); |
7996a778 MC |
1204 | |
1205 | /* | |
1206 | * block eh thread until: | |
1207 | * | |
843c0a8a MC |
1208 | * 1) tmf response |
1209 | * 2) tmf timeout | |
7996a778 MC |
1210 | * 3) session is terminated or restarted or userspace has |
1211 | * given up on recovery | |
1212 | */ | |
843c0a8a | 1213 | wait_event_interruptible(conn->ehwait, age != session->age || |
7996a778 | 1214 | session->state != ISCSI_STATE_LOGGED_IN || |
843c0a8a | 1215 | conn->tmf_state != TMF_QUEUED); |
7996a778 MC |
1216 | if (signal_pending(current)) |
1217 | flush_signals(current); | |
843c0a8a MC |
1218 | del_timer_sync(&conn->tmf_timer); |
1219 | ||
6724add1 | 1220 | mutex_lock(&session->eh_mutex); |
77a23c21 | 1221 | spin_lock_bh(&session->lock); |
843c0a8a MC |
1222 | /* if the session drops it will clean up the mtask */ |
1223 | if (age != session->age || | |
1224 | session->state != ISCSI_STATE_LOGGED_IN) | |
1225 | return -ENOTCONN; | |
7996a778 MC |
1226 | return 0; |
1227 | } | |
1228 | ||
843c0a8a MC |
1229 | /* |
1230 | * Fail commands. session lock held and recv side suspended and xmit | |
1231 | * thread flushed | |
1232 | */ | |
1233 | static void fail_all_commands(struct iscsi_conn *conn, unsigned lun) | |
1234 | { | |
1235 | struct iscsi_cmd_task *ctask, *tmp; | |
1236 | ||
1237 | if (conn->ctask && (conn->ctask->sc->device->lun == lun || lun == -1)) | |
1238 | conn->ctask = NULL; | |
1239 | ||
1240 | /* flush pending */ | |
1241 | list_for_each_entry_safe(ctask, tmp, &conn->xmitqueue, running) { | |
1242 | if (lun == ctask->sc->device->lun || lun == -1) { | |
1243 | debug_scsi("failing pending sc %p itt 0x%x\n", | |
1244 | ctask->sc, ctask->itt); | |
1245 | fail_command(conn, ctask, DID_BUS_BUSY << 16); | |
1246 | } | |
1247 | } | |
1248 | ||
1249 | list_for_each_entry_safe(ctask, tmp, &conn->requeue, running) { | |
1250 | if (lun == ctask->sc->device->lun || lun == -1) { | |
1251 | debug_scsi("failing requeued sc %p itt 0x%x\n", | |
1252 | ctask->sc, ctask->itt); | |
1253 | fail_command(conn, ctask, DID_BUS_BUSY << 16); | |
1254 | } | |
1255 | } | |
1256 | ||
1257 | /* fail all other running */ | |
1258 | list_for_each_entry_safe(ctask, tmp, &conn->run_list, running) { | |
1259 | if (lun == ctask->sc->device->lun || lun == -1) { | |
1260 | debug_scsi("failing in progress sc %p itt 0x%x\n", | |
1261 | ctask->sc, ctask->itt); | |
1262 | fail_command(conn, ctask, DID_BUS_BUSY << 16); | |
1263 | } | |
1264 | } | |
1265 | } | |
1266 | ||
6724add1 MC |
1267 | static void iscsi_suspend_tx(struct iscsi_conn *conn) |
1268 | { | |
1269 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
1270 | scsi_flush_work(conn->session->host); | |
1271 | } | |
1272 | ||
1273 | static void iscsi_start_tx(struct iscsi_conn *conn) | |
1274 | { | |
1275 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
1276 | scsi_queue_work(conn->session->host, &conn->xmitwork); | |
1277 | } | |
1278 | ||
f6d5180c MC |
1279 | static enum scsi_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *scmd) |
1280 | { | |
1281 | struct iscsi_cls_session *cls_session; | |
1282 | struct iscsi_session *session; | |
1283 | struct iscsi_conn *conn; | |
1284 | enum scsi_eh_timer_return rc = EH_NOT_HANDLED; | |
1285 | ||
1286 | cls_session = starget_to_session(scsi_target(scmd->device)); | |
1287 | session = class_to_transport_session(cls_session); | |
1288 | ||
1289 | debug_scsi("scsi cmd %p timedout\n", scmd); | |
1290 | ||
1291 | spin_lock(&session->lock); | |
1292 | if (session->state != ISCSI_STATE_LOGGED_IN) { | |
1293 | /* | |
1294 | * We are probably in the middle of iscsi recovery so let | |
1295 | * that complete and handle the error. | |
1296 | */ | |
1297 | rc = EH_RESET_TIMER; | |
1298 | goto done; | |
1299 | } | |
1300 | ||
1301 | conn = session->leadconn; | |
1302 | if (!conn) { | |
1303 | /* In the middle of shuting down */ | |
1304 | rc = EH_RESET_TIMER; | |
1305 | goto done; | |
1306 | } | |
1307 | ||
1308 | if (!conn->recv_timeout && !conn->ping_timeout) | |
1309 | goto done; | |
1310 | /* | |
1311 | * if the ping timedout then we are in the middle of cleaning up | |
1312 | * and can let the iscsi eh handle it | |
1313 | */ | |
1314 | if (time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) + | |
1315 | (conn->ping_timeout * HZ), jiffies)) | |
1316 | rc = EH_RESET_TIMER; | |
1317 | /* | |
1318 | * if we are about to check the transport then give the command | |
1319 | * more time | |
1320 | */ | |
1321 | if (time_before_eq(conn->last_recv + (conn->recv_timeout * HZ), | |
1322 | jiffies)) | |
1323 | rc = EH_RESET_TIMER; | |
1324 | /* if in the middle of checking the transport then give us more time */ | |
1325 | if (conn->ping_mtask) | |
1326 | rc = EH_RESET_TIMER; | |
1327 | done: | |
1328 | spin_unlock(&session->lock); | |
1329 | debug_scsi("return %s\n", rc == EH_RESET_TIMER ? "timer reset" : "nh"); | |
1330 | return rc; | |
1331 | } | |
1332 | ||
1333 | static void iscsi_check_transport_timeouts(unsigned long data) | |
1334 | { | |
1335 | struct iscsi_conn *conn = (struct iscsi_conn *)data; | |
1336 | struct iscsi_session *session = conn->session; | |
1337 | unsigned long timeout, next_timeout = 0, last_recv; | |
1338 | ||
1339 | spin_lock(&session->lock); | |
1340 | if (session->state != ISCSI_STATE_LOGGED_IN) | |
1341 | goto done; | |
1342 | ||
1343 | timeout = conn->recv_timeout; | |
1344 | if (!timeout) | |
1345 | goto done; | |
1346 | ||
1347 | timeout *= HZ; | |
1348 | last_recv = conn->last_recv; | |
1349 | if (time_before_eq(last_recv + timeout + (conn->ping_timeout * HZ), | |
1350 | jiffies)) { | |
1351 | printk(KERN_ERR "ping timeout of %d secs expired, " | |
1352 | "last rx %lu, last ping %lu, now %lu\n", | |
1353 | conn->ping_timeout, last_recv, | |
1354 | conn->last_ping, jiffies); | |
1355 | spin_unlock(&session->lock); | |
1356 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1357 | return; | |
1358 | } | |
1359 | ||
1360 | if (time_before_eq(last_recv + timeout, jiffies)) { | |
1361 | if (time_before_eq(conn->last_ping, last_recv)) { | |
1362 | /* send a ping to try to provoke some traffic */ | |
1363 | debug_scsi("Sending nopout as ping on conn %p\n", conn); | |
1364 | iscsi_send_nopout(conn, NULL); | |
1365 | } | |
1366 | next_timeout = last_recv + timeout + (conn->ping_timeout * HZ); | |
1367 | } else { | |
1368 | next_timeout = last_recv + timeout; | |
1369 | } | |
1370 | ||
1371 | if (next_timeout) { | |
1372 | debug_scsi("Setting next tmo %lu\n", next_timeout); | |
1373 | mod_timer(&conn->transport_timer, next_timeout); | |
1374 | } | |
1375 | done: | |
1376 | spin_unlock(&session->lock); | |
1377 | } | |
1378 | ||
843c0a8a MC |
1379 | static void iscsi_prep_abort_task_pdu(struct iscsi_cmd_task *ctask, |
1380 | struct iscsi_tm *hdr) | |
1381 | { | |
1382 | memset(hdr, 0, sizeof(*hdr)); | |
1383 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
1384 | hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK; | |
1385 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
1386 | memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); | |
1387 | hdr->rtt = ctask->hdr->itt; | |
1388 | hdr->refcmdsn = ctask->hdr->cmdsn; | |
1389 | } | |
1390 | ||
7996a778 MC |
1391 | int iscsi_eh_abort(struct scsi_cmnd *sc) |
1392 | { | |
6724add1 MC |
1393 | struct Scsi_Host *host = sc->device->host; |
1394 | struct iscsi_session *session = iscsi_hostdata(host->hostdata); | |
f47f2cf5 | 1395 | struct iscsi_conn *conn; |
843c0a8a MC |
1396 | struct iscsi_cmd_task *ctask; |
1397 | struct iscsi_tm *hdr; | |
1398 | int rc, age; | |
7996a778 | 1399 | |
6724add1 MC |
1400 | mutex_lock(&session->eh_mutex); |
1401 | spin_lock_bh(&session->lock); | |
f47f2cf5 MC |
1402 | /* |
1403 | * if session was ISCSI_STATE_IN_RECOVERY then we may not have | |
1404 | * got the command. | |
1405 | */ | |
1406 | if (!sc->SCp.ptr) { | |
1407 | debug_scsi("sc never reached iscsi layer or it completed.\n"); | |
6724add1 MC |
1408 | spin_unlock_bh(&session->lock); |
1409 | mutex_unlock(&session->eh_mutex); | |
f47f2cf5 MC |
1410 | return SUCCESS; |
1411 | } | |
1412 | ||
7996a778 MC |
1413 | /* |
1414 | * If we are not logged in or we have started a new session | |
1415 | * then let the host reset code handle this | |
1416 | */ | |
843c0a8a MC |
1417 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN || |
1418 | sc->SCp.phase != session->age) { | |
1419 | spin_unlock_bh(&session->lock); | |
1420 | mutex_unlock(&session->eh_mutex); | |
1421 | return FAILED; | |
1422 | } | |
1423 | ||
1424 | conn = session->leadconn; | |
1425 | conn->eh_abort_cnt++; | |
1426 | age = session->age; | |
1427 | ||
1428 | ctask = (struct iscsi_cmd_task *)sc->SCp.ptr; | |
1429 | debug_scsi("aborting [sc %p itt 0x%x]\n", sc, ctask->itt); | |
7996a778 MC |
1430 | |
1431 | /* ctask completed before time out */ | |
7ea8b828 | 1432 | if (!ctask->sc) { |
7ea8b828 | 1433 | debug_scsi("sc completed while abort in progress\n"); |
77a23c21 | 1434 | goto success; |
7ea8b828 | 1435 | } |
7996a778 | 1436 | |
77a23c21 MC |
1437 | if (ctask->state == ISCSI_TASK_PENDING) { |
1438 | fail_command(conn, ctask, DID_ABORT << 16); | |
1439 | goto success; | |
1440 | } | |
7996a778 | 1441 | |
843c0a8a MC |
1442 | /* only have one tmf outstanding at a time */ |
1443 | if (conn->tmf_state != TMF_INITIAL) | |
7996a778 | 1444 | goto failed; |
843c0a8a | 1445 | conn->tmf_state = TMF_QUEUED; |
7996a778 | 1446 | |
843c0a8a MC |
1447 | hdr = &conn->tmhdr; |
1448 | iscsi_prep_abort_task_pdu(ctask, hdr); | |
1449 | ||
f6d5180c | 1450 | if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout)) { |
843c0a8a MC |
1451 | rc = FAILED; |
1452 | goto failed; | |
1453 | } | |
1454 | ||
1455 | switch (conn->tmf_state) { | |
1456 | case TMF_SUCCESS: | |
77a23c21 | 1457 | spin_unlock_bh(&session->lock); |
6724add1 | 1458 | iscsi_suspend_tx(conn); |
77a23c21 MC |
1459 | /* |
1460 | * clean up task if aborted. grab the recv lock as a writer | |
1461 | */ | |
1462 | write_lock_bh(conn->recv_lock); | |
1463 | spin_lock(&session->lock); | |
1464 | fail_command(conn, ctask, DID_ABORT << 16); | |
843c0a8a | 1465 | conn->tmf_state = TMF_INITIAL; |
77a23c21 MC |
1466 | spin_unlock(&session->lock); |
1467 | write_unlock_bh(conn->recv_lock); | |
6724add1 | 1468 | iscsi_start_tx(conn); |
77a23c21 | 1469 | goto success_unlocked; |
843c0a8a MC |
1470 | case TMF_TIMEDOUT: |
1471 | spin_unlock_bh(&session->lock); | |
1472 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1473 | goto failed_unlocked; | |
1474 | case TMF_NOT_FOUND: | |
1475 | if (!sc->SCp.ptr) { | |
1476 | conn->tmf_state = TMF_INITIAL; | |
7ea8b828 | 1477 | /* ctask completed before tmf abort response */ |
7ea8b828 | 1478 | debug_scsi("sc completed while abort in progress\n"); |
77a23c21 | 1479 | goto success; |
7ea8b828 MC |
1480 | } |
1481 | /* fall through */ | |
1482 | default: | |
843c0a8a MC |
1483 | conn->tmf_state = TMF_INITIAL; |
1484 | goto failed; | |
7996a778 MC |
1485 | } |
1486 | ||
77a23c21 | 1487 | success: |
7996a778 | 1488 | spin_unlock_bh(&session->lock); |
77a23c21 MC |
1489 | success_unlocked: |
1490 | debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, ctask->itt); | |
6724add1 | 1491 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1492 | return SUCCESS; |
1493 | ||
1494 | failed: | |
1495 | spin_unlock_bh(&session->lock); | |
77a23c21 | 1496 | failed_unlocked: |
843c0a8a MC |
1497 | debug_scsi("abort failed [sc %p itt 0x%x]\n", sc, |
1498 | ctask ? ctask->itt : 0); | |
6724add1 | 1499 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1500 | return FAILED; |
1501 | } | |
1502 | EXPORT_SYMBOL_GPL(iscsi_eh_abort); | |
1503 | ||
843c0a8a MC |
1504 | static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr) |
1505 | { | |
1506 | memset(hdr, 0, sizeof(*hdr)); | |
1507 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
1508 | hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK; | |
1509 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
1510 | int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun); | |
f6d5180c | 1511 | hdr->rtt = RESERVED_ITT; |
843c0a8a MC |
1512 | } |
1513 | ||
1514 | int iscsi_eh_device_reset(struct scsi_cmnd *sc) | |
1515 | { | |
1516 | struct Scsi_Host *host = sc->device->host; | |
1517 | struct iscsi_session *session = iscsi_hostdata(host->hostdata); | |
1518 | struct iscsi_conn *conn; | |
1519 | struct iscsi_tm *hdr; | |
1520 | int rc = FAILED; | |
1521 | ||
1522 | debug_scsi("LU Reset [sc %p lun %u]\n", sc, sc->device->lun); | |
1523 | ||
1524 | mutex_lock(&session->eh_mutex); | |
1525 | spin_lock_bh(&session->lock); | |
1526 | /* | |
1527 | * Just check if we are not logged in. We cannot check for | |
1528 | * the phase because the reset could come from a ioctl. | |
1529 | */ | |
1530 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN) | |
1531 | goto unlock; | |
1532 | conn = session->leadconn; | |
1533 | ||
1534 | /* only have one tmf outstanding at a time */ | |
1535 | if (conn->tmf_state != TMF_INITIAL) | |
1536 | goto unlock; | |
1537 | conn->tmf_state = TMF_QUEUED; | |
1538 | ||
1539 | hdr = &conn->tmhdr; | |
1540 | iscsi_prep_lun_reset_pdu(sc, hdr); | |
1541 | ||
f6d5180c MC |
1542 | if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age, |
1543 | session->lu_reset_timeout)) { | |
843c0a8a MC |
1544 | rc = FAILED; |
1545 | goto unlock; | |
1546 | } | |
1547 | ||
1548 | switch (conn->tmf_state) { | |
1549 | case TMF_SUCCESS: | |
1550 | break; | |
1551 | case TMF_TIMEDOUT: | |
1552 | spin_unlock_bh(&session->lock); | |
1553 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1554 | goto done; | |
1555 | default: | |
1556 | conn->tmf_state = TMF_INITIAL; | |
1557 | goto unlock; | |
1558 | } | |
1559 | ||
1560 | rc = SUCCESS; | |
1561 | spin_unlock_bh(&session->lock); | |
1562 | ||
1563 | iscsi_suspend_tx(conn); | |
1564 | /* need to grab the recv lock then session lock */ | |
1565 | write_lock_bh(conn->recv_lock); | |
1566 | spin_lock(&session->lock); | |
1567 | fail_all_commands(conn, sc->device->lun); | |
1568 | conn->tmf_state = TMF_INITIAL; | |
1569 | spin_unlock(&session->lock); | |
1570 | write_unlock_bh(conn->recv_lock); | |
1571 | ||
1572 | iscsi_start_tx(conn); | |
1573 | goto done; | |
1574 | ||
1575 | unlock: | |
1576 | spin_unlock_bh(&session->lock); | |
1577 | done: | |
1578 | debug_scsi("iscsi_eh_device_reset %s\n", | |
1579 | rc == SUCCESS ? "SUCCESS" : "FAILED"); | |
1580 | mutex_unlock(&session->eh_mutex); | |
1581 | return rc; | |
1582 | } | |
1583 | EXPORT_SYMBOL_GPL(iscsi_eh_device_reset); | |
1584 | ||
6320377f OK |
1585 | /* |
1586 | * Pre-allocate a pool of @max items of @item_size. By default, the pool | |
1587 | * should be accessed via kfifo_{get,put} on q->queue. | |
1588 | * Optionally, the caller can obtain the array of object pointers | |
1589 | * by passing in a non-NULL @items pointer | |
1590 | */ | |
7996a778 | 1591 | int |
6320377f | 1592 | iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size) |
7996a778 | 1593 | { |
6320377f | 1594 | int i, num_arrays = 1; |
7996a778 | 1595 | |
6320377f | 1596 | memset(q, 0, sizeof(*q)); |
7996a778 MC |
1597 | |
1598 | q->max = max; | |
6320377f OK |
1599 | |
1600 | /* If the user passed an items pointer, he wants a copy of | |
1601 | * the array. */ | |
1602 | if (items) | |
1603 | num_arrays++; | |
1604 | q->pool = kzalloc(num_arrays * max * sizeof(void*), GFP_KERNEL); | |
1605 | if (q->pool == NULL) | |
1606 | goto enomem; | |
7996a778 MC |
1607 | |
1608 | q->queue = kfifo_init((void*)q->pool, max * sizeof(void*), | |
1609 | GFP_KERNEL, NULL); | |
6320377f OK |
1610 | if (q->queue == ERR_PTR(-ENOMEM)) |
1611 | goto enomem; | |
7996a778 MC |
1612 | |
1613 | for (i = 0; i < max; i++) { | |
6320377f | 1614 | q->pool[i] = kzalloc(item_size, GFP_KERNEL); |
7996a778 | 1615 | if (q->pool[i] == NULL) { |
6320377f OK |
1616 | q->max = i; |
1617 | goto enomem; | |
7996a778 | 1618 | } |
7996a778 MC |
1619 | __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*)); |
1620 | } | |
6320377f OK |
1621 | |
1622 | if (items) { | |
1623 | *items = q->pool + max; | |
1624 | memcpy(*items, q->pool, max * sizeof(void *)); | |
1625 | } | |
1626 | ||
7996a778 | 1627 | return 0; |
6320377f OK |
1628 | |
1629 | enomem: | |
1630 | iscsi_pool_free(q); | |
1631 | return -ENOMEM; | |
7996a778 MC |
1632 | } |
1633 | EXPORT_SYMBOL_GPL(iscsi_pool_init); | |
1634 | ||
6320377f | 1635 | void iscsi_pool_free(struct iscsi_pool *q) |
7996a778 MC |
1636 | { |
1637 | int i; | |
1638 | ||
1639 | for (i = 0; i < q->max; i++) | |
6320377f OK |
1640 | kfree(q->pool[i]); |
1641 | if (q->pool) | |
1642 | kfree(q->pool); | |
7996a778 MC |
1643 | } |
1644 | EXPORT_SYMBOL_GPL(iscsi_pool_free); | |
1645 | ||
1646 | /* | |
1647 | * iSCSI Session's hostdata organization: | |
1648 | * | |
1649 | * *------------------* <== hostdata_session(host->hostdata) | |
1650 | * | ptr to class sess| | |
1651 | * |------------------| <== iscsi_hostdata(host->hostdata) | |
1652 | * | iscsi_session | | |
1653 | * *------------------* | |
1654 | */ | |
1655 | ||
1656 | #define hostdata_privsize(_sz) (sizeof(unsigned long) + _sz + \ | |
1657 | _sz % sizeof(unsigned long)) | |
1658 | ||
1659 | #define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata)) | |
1660 | ||
1661 | /** | |
1662 | * iscsi_session_setup - create iscsi cls session and host and session | |
1663 | * @scsit: scsi transport template | |
1664 | * @iscsit: iscsi transport template | |
1548271e MC |
1665 | * @cmds_max: scsi host can queue |
1666 | * @qdepth: scsi host cmds per lun | |
1667 | * @cmd_task_size: LLD ctask private data size | |
1668 | * @mgmt_task_size: LLD mtask private data size | |
7996a778 MC |
1669 | * @initial_cmdsn: initial CmdSN |
1670 | * @hostno: host no allocated | |
1671 | * | |
1672 | * This can be used by software iscsi_transports that allocate | |
1673 | * a session per scsi host. | |
1674 | **/ | |
1675 | struct iscsi_cls_session * | |
1676 | iscsi_session_setup(struct iscsi_transport *iscsit, | |
1677 | struct scsi_transport_template *scsit, | |
1548271e | 1678 | uint16_t cmds_max, uint16_t qdepth, |
7996a778 MC |
1679 | int cmd_task_size, int mgmt_task_size, |
1680 | uint32_t initial_cmdsn, uint32_t *hostno) | |
1681 | { | |
1682 | struct Scsi_Host *shost; | |
1683 | struct iscsi_session *session; | |
1684 | struct iscsi_cls_session *cls_session; | |
1685 | int cmd_i; | |
1686 | ||
1548271e MC |
1687 | if (qdepth > ISCSI_MAX_CMD_PER_LUN || qdepth < 1) { |
1688 | if (qdepth != 0) | |
1689 | printk(KERN_ERR "iscsi: invalid queue depth of %d. " | |
1690 | "Queue depth must be between 1 and %d.\n", | |
1691 | qdepth, ISCSI_MAX_CMD_PER_LUN); | |
1692 | qdepth = ISCSI_DEF_CMD_PER_LUN; | |
1693 | } | |
1694 | ||
1695 | if (cmds_max < 2 || (cmds_max & (cmds_max - 1)) || | |
1696 | cmds_max >= ISCSI_MGMT_ITT_OFFSET) { | |
1697 | if (cmds_max != 0) | |
1698 | printk(KERN_ERR "iscsi: invalid can_queue of %d. " | |
1699 | "can_queue must be a power of 2 and between " | |
1700 | "2 and %d - setting to %d.\n", cmds_max, | |
1701 | ISCSI_MGMT_ITT_OFFSET, ISCSI_DEF_XMIT_CMDS_MAX); | |
1702 | cmds_max = ISCSI_DEF_XMIT_CMDS_MAX; | |
1703 | } | |
1704 | ||
7996a778 MC |
1705 | shost = scsi_host_alloc(iscsit->host_template, |
1706 | hostdata_privsize(sizeof(*session))); | |
1707 | if (!shost) | |
1708 | return NULL; | |
1709 | ||
1548271e MC |
1710 | /* the iscsi layer takes one task for reserve */ |
1711 | shost->can_queue = cmds_max - 1; | |
1712 | shost->cmd_per_lun = qdepth; | |
7996a778 MC |
1713 | shost->max_id = 1; |
1714 | shost->max_channel = 0; | |
1715 | shost->max_lun = iscsit->max_lun; | |
1716 | shost->max_cmd_len = iscsit->max_cmd_len; | |
1717 | shost->transportt = scsit; | |
1718 | shost->transportt->create_work_queue = 1; | |
f6d5180c | 1719 | shost->transportt->eh_timed_out = iscsi_eh_cmd_timed_out; |
7996a778 MC |
1720 | *hostno = shost->host_no; |
1721 | ||
1722 | session = iscsi_hostdata(shost->hostdata); | |
1723 | memset(session, 0, sizeof(struct iscsi_session)); | |
1724 | session->host = shost; | |
1725 | session->state = ISCSI_STATE_FREE; | |
f6d5180c | 1726 | session->fast_abort = 1; |
7996a778 | 1727 | session->mgmtpool_max = ISCSI_MGMT_CMDS_MAX; |
1548271e | 1728 | session->cmds_max = cmds_max; |
e0726407 | 1729 | session->queued_cmdsn = session->cmdsn = initial_cmdsn; |
7996a778 MC |
1730 | session->exp_cmdsn = initial_cmdsn + 1; |
1731 | session->max_cmdsn = initial_cmdsn + 1; | |
1732 | session->max_r2t = 1; | |
1733 | session->tt = iscsit; | |
6724add1 | 1734 | mutex_init(&session->eh_mutex); |
7996a778 MC |
1735 | |
1736 | /* initialize SCSI PDU commands pool */ | |
1737 | if (iscsi_pool_init(&session->cmdpool, session->cmds_max, | |
1738 | (void***)&session->cmds, | |
1739 | cmd_task_size + sizeof(struct iscsi_cmd_task))) | |
1740 | goto cmdpool_alloc_fail; | |
1741 | ||
1742 | /* pre-format cmds pool with ITT */ | |
1743 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
1744 | struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; | |
1745 | ||
1746 | if (cmd_task_size) | |
1747 | ctask->dd_data = &ctask[1]; | |
1748 | ctask->itt = cmd_i; | |
b6c395ed | 1749 | INIT_LIST_HEAD(&ctask->running); |
7996a778 MC |
1750 | } |
1751 | ||
1752 | spin_lock_init(&session->lock); | |
7996a778 MC |
1753 | |
1754 | /* initialize immediate command pool */ | |
1755 | if (iscsi_pool_init(&session->mgmtpool, session->mgmtpool_max, | |
1756 | (void***)&session->mgmt_cmds, | |
1757 | mgmt_task_size + sizeof(struct iscsi_mgmt_task))) | |
1758 | goto mgmtpool_alloc_fail; | |
1759 | ||
1760 | ||
1761 | /* pre-format immediate cmds pool with ITT */ | |
1762 | for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) { | |
1763 | struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i]; | |
1764 | ||
1765 | if (mgmt_task_size) | |
1766 | mtask->dd_data = &mtask[1]; | |
1767 | mtask->itt = ISCSI_MGMT_ITT_OFFSET + cmd_i; | |
b6c395ed | 1768 | INIT_LIST_HEAD(&mtask->running); |
7996a778 MC |
1769 | } |
1770 | ||
1771 | if (scsi_add_host(shost, NULL)) | |
1772 | goto add_host_fail; | |
1773 | ||
f53a88da MC |
1774 | if (!try_module_get(iscsit->owner)) |
1775 | goto cls_session_fail; | |
1776 | ||
6a8a0d36 | 1777 | cls_session = iscsi_create_session(shost, iscsit, 0); |
7996a778 | 1778 | if (!cls_session) |
f53a88da | 1779 | goto module_put; |
7996a778 MC |
1780 | *(unsigned long*)shost->hostdata = (unsigned long)cls_session; |
1781 | ||
1782 | return cls_session; | |
1783 | ||
f53a88da MC |
1784 | module_put: |
1785 | module_put(iscsit->owner); | |
7996a778 MC |
1786 | cls_session_fail: |
1787 | scsi_remove_host(shost); | |
1788 | add_host_fail: | |
6320377f | 1789 | iscsi_pool_free(&session->mgmtpool); |
7996a778 | 1790 | mgmtpool_alloc_fail: |
6320377f | 1791 | iscsi_pool_free(&session->cmdpool); |
7996a778 MC |
1792 | cmdpool_alloc_fail: |
1793 | scsi_host_put(shost); | |
1794 | return NULL; | |
1795 | } | |
1796 | EXPORT_SYMBOL_GPL(iscsi_session_setup); | |
1797 | ||
1798 | /** | |
1799 | * iscsi_session_teardown - destroy session, host, and cls_session | |
1800 | * shost: scsi host | |
1801 | * | |
1802 | * This can be used by software iscsi_transports that allocate | |
1803 | * a session per scsi host. | |
1804 | **/ | |
1805 | void iscsi_session_teardown(struct iscsi_cls_session *cls_session) | |
1806 | { | |
1807 | struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); | |
1808 | struct iscsi_session *session = iscsi_hostdata(shost->hostdata); | |
63f75cc8 | 1809 | struct module *owner = cls_session->transport->owner; |
7996a778 | 1810 | |
26974789 | 1811 | iscsi_remove_session(cls_session); |
7996a778 MC |
1812 | scsi_remove_host(shost); |
1813 | ||
6320377f OK |
1814 | iscsi_pool_free(&session->mgmtpool); |
1815 | iscsi_pool_free(&session->cmdpool); | |
7996a778 | 1816 | |
b2c64167 MC |
1817 | kfree(session->password); |
1818 | kfree(session->password_in); | |
1819 | kfree(session->username); | |
1820 | kfree(session->username_in); | |
f3ff0c36 | 1821 | kfree(session->targetname); |
d8196ed2 | 1822 | kfree(session->netdev); |
0801c242 | 1823 | kfree(session->hwaddress); |
8ad5781a | 1824 | kfree(session->initiatorname); |
f3ff0c36 | 1825 | |
26974789 | 1826 | iscsi_free_session(cls_session); |
7996a778 | 1827 | scsi_host_put(shost); |
63f75cc8 | 1828 | module_put(owner); |
7996a778 MC |
1829 | } |
1830 | EXPORT_SYMBOL_GPL(iscsi_session_teardown); | |
1831 | ||
1832 | /** | |
1833 | * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn | |
1834 | * @cls_session: iscsi_cls_session | |
1835 | * @conn_idx: cid | |
1836 | **/ | |
1837 | struct iscsi_cls_conn * | |
1838 | iscsi_conn_setup(struct iscsi_cls_session *cls_session, uint32_t conn_idx) | |
1839 | { | |
1840 | struct iscsi_session *session = class_to_transport_session(cls_session); | |
1841 | struct iscsi_conn *conn; | |
1842 | struct iscsi_cls_conn *cls_conn; | |
d36ab6f3 | 1843 | char *data; |
7996a778 MC |
1844 | |
1845 | cls_conn = iscsi_create_conn(cls_session, conn_idx); | |
1846 | if (!cls_conn) | |
1847 | return NULL; | |
1848 | conn = cls_conn->dd_data; | |
1849 | memset(conn, 0, sizeof(*conn)); | |
1850 | ||
1851 | conn->session = session; | |
1852 | conn->cls_conn = cls_conn; | |
1853 | conn->c_stage = ISCSI_CONN_INITIAL_STAGE; | |
1854 | conn->id = conn_idx; | |
1855 | conn->exp_statsn = 0; | |
843c0a8a | 1856 | conn->tmf_state = TMF_INITIAL; |
f6d5180c MC |
1857 | |
1858 | init_timer(&conn->transport_timer); | |
1859 | conn->transport_timer.data = (unsigned long)conn; | |
1860 | conn->transport_timer.function = iscsi_check_transport_timeouts; | |
1861 | ||
7996a778 MC |
1862 | INIT_LIST_HEAD(&conn->run_list); |
1863 | INIT_LIST_HEAD(&conn->mgmt_run_list); | |
843c0a8a | 1864 | INIT_LIST_HEAD(&conn->mgmtqueue); |
b6c395ed | 1865 | INIT_LIST_HEAD(&conn->xmitqueue); |
843c0a8a | 1866 | INIT_LIST_HEAD(&conn->requeue); |
c4028958 | 1867 | INIT_WORK(&conn->xmitwork, iscsi_xmitworker); |
7996a778 MC |
1868 | |
1869 | /* allocate login_mtask used for the login/text sequences */ | |
1870 | spin_lock_bh(&session->lock); | |
1871 | if (!__kfifo_get(session->mgmtpool.queue, | |
1872 | (void*)&conn->login_mtask, | |
1873 | sizeof(void*))) { | |
1874 | spin_unlock_bh(&session->lock); | |
1875 | goto login_mtask_alloc_fail; | |
1876 | } | |
1877 | spin_unlock_bh(&session->lock); | |
1878 | ||
bf32ed33 | 1879 | data = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN, GFP_KERNEL); |
d36ab6f3 MC |
1880 | if (!data) |
1881 | goto login_mtask_data_alloc_fail; | |
c8dc1e52 | 1882 | conn->login_mtask->data = conn->data = data; |
d36ab6f3 | 1883 | |
843c0a8a | 1884 | init_timer(&conn->tmf_timer); |
7996a778 MC |
1885 | init_waitqueue_head(&conn->ehwait); |
1886 | ||
1887 | return cls_conn; | |
1888 | ||
d36ab6f3 MC |
1889 | login_mtask_data_alloc_fail: |
1890 | __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask, | |
1891 | sizeof(void*)); | |
7996a778 | 1892 | login_mtask_alloc_fail: |
7996a778 MC |
1893 | iscsi_destroy_conn(cls_conn); |
1894 | return NULL; | |
1895 | } | |
1896 | EXPORT_SYMBOL_GPL(iscsi_conn_setup); | |
1897 | ||
1898 | /** | |
1899 | * iscsi_conn_teardown - teardown iscsi connection | |
1900 | * cls_conn: iscsi class connection | |
1901 | * | |
1902 | * TODO: we may need to make this into a two step process | |
1903 | * like scsi-mls remove + put host | |
1904 | */ | |
1905 | void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn) | |
1906 | { | |
1907 | struct iscsi_conn *conn = cls_conn->dd_data; | |
1908 | struct iscsi_session *session = conn->session; | |
1909 | unsigned long flags; | |
1910 | ||
f6d5180c MC |
1911 | del_timer_sync(&conn->transport_timer); |
1912 | ||
7996a778 MC |
1913 | spin_lock_bh(&session->lock); |
1914 | conn->c_stage = ISCSI_CONN_CLEANUP_WAIT; | |
1915 | if (session->leadconn == conn) { | |
1916 | /* | |
1917 | * leading connection? then give up on recovery. | |
1918 | */ | |
1919 | session->state = ISCSI_STATE_TERMINATE; | |
1920 | wake_up(&conn->ehwait); | |
1921 | } | |
1922 | spin_unlock_bh(&session->lock); | |
1923 | ||
7996a778 MC |
1924 | /* |
1925 | * Block until all in-progress commands for this connection | |
1926 | * time out or fail. | |
1927 | */ | |
1928 | for (;;) { | |
1929 | spin_lock_irqsave(session->host->host_lock, flags); | |
1930 | if (!session->host->host_busy) { /* OK for ERL == 0 */ | |
1931 | spin_unlock_irqrestore(session->host->host_lock, flags); | |
1932 | break; | |
1933 | } | |
1934 | spin_unlock_irqrestore(session->host->host_lock, flags); | |
1935 | msleep_interruptible(500); | |
be2df72e OG |
1936 | printk(KERN_INFO "iscsi: scsi conn_destroy(): host_busy %d " |
1937 | "host_failed %d\n", session->host->host_busy, | |
1938 | session->host->host_failed); | |
7996a778 MC |
1939 | /* |
1940 | * force eh_abort() to unblock | |
1941 | */ | |
1942 | wake_up(&conn->ehwait); | |
1943 | } | |
1944 | ||
779ea120 | 1945 | /* flush queued up work because we free the connection below */ |
843c0a8a | 1946 | iscsi_suspend_tx(conn); |
779ea120 | 1947 | |
7996a778 | 1948 | spin_lock_bh(&session->lock); |
c8dc1e52 | 1949 | kfree(conn->data); |
f3ff0c36 | 1950 | kfree(conn->persistent_address); |
7996a778 MC |
1951 | __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask, |
1952 | sizeof(void*)); | |
e0726407 | 1953 | if (session->leadconn == conn) |
7996a778 | 1954 | session->leadconn = NULL; |
7996a778 MC |
1955 | spin_unlock_bh(&session->lock); |
1956 | ||
7996a778 MC |
1957 | iscsi_destroy_conn(cls_conn); |
1958 | } | |
1959 | EXPORT_SYMBOL_GPL(iscsi_conn_teardown); | |
1960 | ||
1961 | int iscsi_conn_start(struct iscsi_cls_conn *cls_conn) | |
1962 | { | |
1963 | struct iscsi_conn *conn = cls_conn->dd_data; | |
1964 | struct iscsi_session *session = conn->session; | |
1965 | ||
ffd0436e | 1966 | if (!session) { |
7996a778 MC |
1967 | printk(KERN_ERR "iscsi: can't start unbound connection\n"); |
1968 | return -EPERM; | |
1969 | } | |
1970 | ||
db98ccde MC |
1971 | if ((session->imm_data_en || !session->initial_r2t_en) && |
1972 | session->first_burst > session->max_burst) { | |
ffd0436e MC |
1973 | printk("iscsi: invalid burst lengths: " |
1974 | "first_burst %d max_burst %d\n", | |
1975 | session->first_burst, session->max_burst); | |
1976 | return -EINVAL; | |
1977 | } | |
1978 | ||
f6d5180c MC |
1979 | if (conn->ping_timeout && !conn->recv_timeout) { |
1980 | printk(KERN_ERR "iscsi: invalid recv timeout of zero " | |
1981 | "Using 5 seconds\n."); | |
1982 | conn->recv_timeout = 5; | |
1983 | } | |
1984 | ||
1985 | if (conn->recv_timeout && !conn->ping_timeout) { | |
1986 | printk(KERN_ERR "iscsi: invalid ping timeout of zero " | |
1987 | "Using 5 seconds.\n"); | |
1988 | conn->ping_timeout = 5; | |
1989 | } | |
1990 | ||
7996a778 MC |
1991 | spin_lock_bh(&session->lock); |
1992 | conn->c_stage = ISCSI_CONN_STARTED; | |
1993 | session->state = ISCSI_STATE_LOGGED_IN; | |
e0726407 | 1994 | session->queued_cmdsn = session->cmdsn; |
7996a778 | 1995 | |
f6d5180c MC |
1996 | conn->last_recv = jiffies; |
1997 | conn->last_ping = jiffies; | |
1998 | if (conn->recv_timeout && conn->ping_timeout) | |
1999 | mod_timer(&conn->transport_timer, | |
2000 | jiffies + (conn->recv_timeout * HZ)); | |
2001 | ||
7996a778 MC |
2002 | switch(conn->stop_stage) { |
2003 | case STOP_CONN_RECOVER: | |
2004 | /* | |
2005 | * unblock eh_abort() if it is blocked. re-try all | |
2006 | * commands after successful recovery | |
2007 | */ | |
7996a778 | 2008 | conn->stop_stage = 0; |
843c0a8a | 2009 | conn->tmf_state = TMF_INITIAL; |
7996a778 | 2010 | session->age++; |
7996a778 MC |
2011 | spin_unlock_bh(&session->lock); |
2012 | ||
2013 | iscsi_unblock_session(session_to_cls(session)); | |
2014 | wake_up(&conn->ehwait); | |
2015 | return 0; | |
2016 | case STOP_CONN_TERM: | |
7996a778 | 2017 | conn->stop_stage = 0; |
7996a778 MC |
2018 | break; |
2019 | default: | |
2020 | break; | |
2021 | } | |
2022 | spin_unlock_bh(&session->lock); | |
2023 | ||
2024 | return 0; | |
2025 | } | |
2026 | EXPORT_SYMBOL_GPL(iscsi_conn_start); | |
2027 | ||
2028 | static void | |
2029 | flush_control_queues(struct iscsi_session *session, struct iscsi_conn *conn) | |
2030 | { | |
2031 | struct iscsi_mgmt_task *mtask, *tmp; | |
2032 | ||
2033 | /* handle pending */ | |
843c0a8a MC |
2034 | list_for_each_entry_safe(mtask, tmp, &conn->mgmtqueue, running) { |
2035 | debug_scsi("flushing pending mgmt task itt 0x%x\n", mtask->itt); | |
b3a7ea8d | 2036 | iscsi_free_mgmt_task(conn, mtask); |
7996a778 MC |
2037 | } |
2038 | ||
2039 | /* handle running */ | |
2040 | list_for_each_entry_safe(mtask, tmp, &conn->mgmt_run_list, running) { | |
2041 | debug_scsi("flushing running mgmt task itt 0x%x\n", mtask->itt); | |
b3a7ea8d | 2042 | iscsi_free_mgmt_task(conn, mtask); |
7996a778 MC |
2043 | } |
2044 | ||
2045 | conn->mtask = NULL; | |
2046 | } | |
2047 | ||
656cffc9 MC |
2048 | static void iscsi_start_session_recovery(struct iscsi_session *session, |
2049 | struct iscsi_conn *conn, int flag) | |
7996a778 | 2050 | { |
ed2abc7f MC |
2051 | int old_stop_stage; |
2052 | ||
f6d5180c MC |
2053 | del_timer_sync(&conn->transport_timer); |
2054 | ||
6724add1 | 2055 | mutex_lock(&session->eh_mutex); |
7996a778 | 2056 | spin_lock_bh(&session->lock); |
ed2abc7f | 2057 | if (conn->stop_stage == STOP_CONN_TERM) { |
7996a778 | 2058 | spin_unlock_bh(&session->lock); |
6724add1 MC |
2059 | mutex_unlock(&session->eh_mutex); |
2060 | return; | |
2061 | } | |
2062 | ||
2063 | /* | |
2064 | * The LLD either freed/unset the lock on us, or userspace called | |
2065 | * stop but did not create a proper connection (connection was never | |
2066 | * bound or it was unbound then stop was called). | |
2067 | */ | |
2068 | if (!conn->recv_lock) { | |
2069 | spin_unlock_bh(&session->lock); | |
2070 | mutex_unlock(&session->eh_mutex); | |
7996a778 MC |
2071 | return; |
2072 | } | |
ed2abc7f MC |
2073 | |
2074 | /* | |
2075 | * When this is called for the in_login state, we only want to clean | |
67a61114 MC |
2076 | * up the login task and connection. We do not need to block and set |
2077 | * the recovery state again | |
ed2abc7f | 2078 | */ |
67a61114 MC |
2079 | if (flag == STOP_CONN_TERM) |
2080 | session->state = ISCSI_STATE_TERMINATE; | |
2081 | else if (conn->stop_stage != STOP_CONN_RECOVER) | |
2082 | session->state = ISCSI_STATE_IN_RECOVERY; | |
ed2abc7f MC |
2083 | |
2084 | old_stop_stage = conn->stop_stage; | |
7996a778 | 2085 | conn->stop_stage = flag; |
67a61114 | 2086 | conn->c_stage = ISCSI_CONN_STOPPED; |
7996a778 | 2087 | spin_unlock_bh(&session->lock); |
6724add1 MC |
2088 | |
2089 | iscsi_suspend_tx(conn); | |
7996a778 | 2090 | |
1c83469d MC |
2091 | write_lock_bh(conn->recv_lock); |
2092 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
2093 | write_unlock_bh(conn->recv_lock); | |
7996a778 | 2094 | |
7996a778 MC |
2095 | /* |
2096 | * for connection level recovery we should not calculate | |
2097 | * header digest. conn->hdr_size used for optimization | |
2098 | * in hdr_extract() and will be re-negotiated at | |
2099 | * set_param() time. | |
2100 | */ | |
2101 | if (flag == STOP_CONN_RECOVER) { | |
2102 | conn->hdrdgst_en = 0; | |
2103 | conn->datadgst_en = 0; | |
656cffc9 | 2104 | if (session->state == ISCSI_STATE_IN_RECOVERY && |
67a61114 MC |
2105 | old_stop_stage != STOP_CONN_RECOVER) { |
2106 | debug_scsi("blocking session\n"); | |
7996a778 | 2107 | iscsi_block_session(session_to_cls(session)); |
67a61114 | 2108 | } |
7996a778 | 2109 | } |
656cffc9 | 2110 | |
656cffc9 MC |
2111 | /* |
2112 | * flush queues. | |
2113 | */ | |
2114 | spin_lock_bh(&session->lock); | |
843c0a8a | 2115 | fail_all_commands(conn, -1); |
656cffc9 MC |
2116 | flush_control_queues(session, conn); |
2117 | spin_unlock_bh(&session->lock); | |
6724add1 | 2118 | mutex_unlock(&session->eh_mutex); |
7996a778 | 2119 | } |
7996a778 MC |
2120 | |
2121 | void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) | |
2122 | { | |
2123 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2124 | struct iscsi_session *session = conn->session; | |
2125 | ||
2126 | switch (flag) { | |
2127 | case STOP_CONN_RECOVER: | |
2128 | case STOP_CONN_TERM: | |
2129 | iscsi_start_session_recovery(session, conn, flag); | |
8d2860b3 | 2130 | break; |
7996a778 | 2131 | default: |
be2df72e | 2132 | printk(KERN_ERR "iscsi: invalid stop flag %d\n", flag); |
7996a778 MC |
2133 | } |
2134 | } | |
2135 | EXPORT_SYMBOL_GPL(iscsi_conn_stop); | |
2136 | ||
2137 | int iscsi_conn_bind(struct iscsi_cls_session *cls_session, | |
2138 | struct iscsi_cls_conn *cls_conn, int is_leading) | |
2139 | { | |
2140 | struct iscsi_session *session = class_to_transport_session(cls_session); | |
98644047 | 2141 | struct iscsi_conn *conn = cls_conn->dd_data; |
7996a778 | 2142 | |
7996a778 | 2143 | spin_lock_bh(&session->lock); |
7996a778 MC |
2144 | if (is_leading) |
2145 | session->leadconn = conn; | |
98644047 | 2146 | spin_unlock_bh(&session->lock); |
7996a778 MC |
2147 | |
2148 | /* | |
2149 | * Unblock xmitworker(), Login Phase will pass through. | |
2150 | */ | |
2151 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
2152 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
2153 | return 0; | |
2154 | } | |
2155 | EXPORT_SYMBOL_GPL(iscsi_conn_bind); | |
2156 | ||
a54a52ca MC |
2157 | |
2158 | int iscsi_set_param(struct iscsi_cls_conn *cls_conn, | |
2159 | enum iscsi_param param, char *buf, int buflen) | |
2160 | { | |
2161 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2162 | struct iscsi_session *session = conn->session; | |
2163 | uint32_t value; | |
2164 | ||
2165 | switch(param) { | |
843c0a8a MC |
2166 | case ISCSI_PARAM_FAST_ABORT: |
2167 | sscanf(buf, "%d", &session->fast_abort); | |
2168 | break; | |
f6d5180c MC |
2169 | case ISCSI_PARAM_ABORT_TMO: |
2170 | sscanf(buf, "%d", &session->abort_timeout); | |
2171 | break; | |
2172 | case ISCSI_PARAM_LU_RESET_TMO: | |
2173 | sscanf(buf, "%d", &session->lu_reset_timeout); | |
2174 | break; | |
2175 | case ISCSI_PARAM_PING_TMO: | |
2176 | sscanf(buf, "%d", &conn->ping_timeout); | |
2177 | break; | |
2178 | case ISCSI_PARAM_RECV_TMO: | |
2179 | sscanf(buf, "%d", &conn->recv_timeout); | |
2180 | break; | |
a54a52ca MC |
2181 | case ISCSI_PARAM_MAX_RECV_DLENGTH: |
2182 | sscanf(buf, "%d", &conn->max_recv_dlength); | |
2183 | break; | |
2184 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
2185 | sscanf(buf, "%d", &conn->max_xmit_dlength); | |
2186 | break; | |
2187 | case ISCSI_PARAM_HDRDGST_EN: | |
2188 | sscanf(buf, "%d", &conn->hdrdgst_en); | |
2189 | break; | |
2190 | case ISCSI_PARAM_DATADGST_EN: | |
2191 | sscanf(buf, "%d", &conn->datadgst_en); | |
2192 | break; | |
2193 | case ISCSI_PARAM_INITIAL_R2T_EN: | |
2194 | sscanf(buf, "%d", &session->initial_r2t_en); | |
2195 | break; | |
2196 | case ISCSI_PARAM_MAX_R2T: | |
2197 | sscanf(buf, "%d", &session->max_r2t); | |
2198 | break; | |
2199 | case ISCSI_PARAM_IMM_DATA_EN: | |
2200 | sscanf(buf, "%d", &session->imm_data_en); | |
2201 | break; | |
2202 | case ISCSI_PARAM_FIRST_BURST: | |
2203 | sscanf(buf, "%d", &session->first_burst); | |
2204 | break; | |
2205 | case ISCSI_PARAM_MAX_BURST: | |
2206 | sscanf(buf, "%d", &session->max_burst); | |
2207 | break; | |
2208 | case ISCSI_PARAM_PDU_INORDER_EN: | |
2209 | sscanf(buf, "%d", &session->pdu_inorder_en); | |
2210 | break; | |
2211 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
2212 | sscanf(buf, "%d", &session->dataseq_inorder_en); | |
2213 | break; | |
2214 | case ISCSI_PARAM_ERL: | |
2215 | sscanf(buf, "%d", &session->erl); | |
2216 | break; | |
2217 | case ISCSI_PARAM_IFMARKER_EN: | |
2218 | sscanf(buf, "%d", &value); | |
2219 | BUG_ON(value); | |
2220 | break; | |
2221 | case ISCSI_PARAM_OFMARKER_EN: | |
2222 | sscanf(buf, "%d", &value); | |
2223 | BUG_ON(value); | |
2224 | break; | |
2225 | case ISCSI_PARAM_EXP_STATSN: | |
2226 | sscanf(buf, "%u", &conn->exp_statsn); | |
2227 | break; | |
b2c64167 MC |
2228 | case ISCSI_PARAM_USERNAME: |
2229 | kfree(session->username); | |
2230 | session->username = kstrdup(buf, GFP_KERNEL); | |
2231 | if (!session->username) | |
2232 | return -ENOMEM; | |
2233 | break; | |
2234 | case ISCSI_PARAM_USERNAME_IN: | |
2235 | kfree(session->username_in); | |
2236 | session->username_in = kstrdup(buf, GFP_KERNEL); | |
2237 | if (!session->username_in) | |
2238 | return -ENOMEM; | |
2239 | break; | |
2240 | case ISCSI_PARAM_PASSWORD: | |
2241 | kfree(session->password); | |
2242 | session->password = kstrdup(buf, GFP_KERNEL); | |
2243 | if (!session->password) | |
2244 | return -ENOMEM; | |
2245 | break; | |
2246 | case ISCSI_PARAM_PASSWORD_IN: | |
2247 | kfree(session->password_in); | |
2248 | session->password_in = kstrdup(buf, GFP_KERNEL); | |
2249 | if (!session->password_in) | |
2250 | return -ENOMEM; | |
2251 | break; | |
a54a52ca MC |
2252 | case ISCSI_PARAM_TARGET_NAME: |
2253 | /* this should not change between logins */ | |
2254 | if (session->targetname) | |
2255 | break; | |
2256 | ||
2257 | session->targetname = kstrdup(buf, GFP_KERNEL); | |
2258 | if (!session->targetname) | |
2259 | return -ENOMEM; | |
2260 | break; | |
2261 | case ISCSI_PARAM_TPGT: | |
2262 | sscanf(buf, "%d", &session->tpgt); | |
2263 | break; | |
2264 | case ISCSI_PARAM_PERSISTENT_PORT: | |
2265 | sscanf(buf, "%d", &conn->persistent_port); | |
2266 | break; | |
2267 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
2268 | /* | |
2269 | * this is the address returned in discovery so it should | |
2270 | * not change between logins. | |
2271 | */ | |
2272 | if (conn->persistent_address) | |
2273 | break; | |
2274 | ||
2275 | conn->persistent_address = kstrdup(buf, GFP_KERNEL); | |
2276 | if (!conn->persistent_address) | |
2277 | return -ENOMEM; | |
2278 | break; | |
2279 | default: | |
2280 | return -ENOSYS; | |
2281 | } | |
2282 | ||
2283 | return 0; | |
2284 | } | |
2285 | EXPORT_SYMBOL_GPL(iscsi_set_param); | |
2286 | ||
2287 | int iscsi_session_get_param(struct iscsi_cls_session *cls_session, | |
2288 | enum iscsi_param param, char *buf) | |
2289 | { | |
2290 | struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); | |
2291 | struct iscsi_session *session = iscsi_hostdata(shost->hostdata); | |
2292 | int len; | |
2293 | ||
2294 | switch(param) { | |
843c0a8a MC |
2295 | case ISCSI_PARAM_FAST_ABORT: |
2296 | len = sprintf(buf, "%d\n", session->fast_abort); | |
2297 | break; | |
f6d5180c MC |
2298 | case ISCSI_PARAM_ABORT_TMO: |
2299 | len = sprintf(buf, "%d\n", session->abort_timeout); | |
2300 | break; | |
2301 | case ISCSI_PARAM_LU_RESET_TMO: | |
2302 | len = sprintf(buf, "%d\n", session->lu_reset_timeout); | |
2303 | break; | |
a54a52ca MC |
2304 | case ISCSI_PARAM_INITIAL_R2T_EN: |
2305 | len = sprintf(buf, "%d\n", session->initial_r2t_en); | |
2306 | break; | |
2307 | case ISCSI_PARAM_MAX_R2T: | |
2308 | len = sprintf(buf, "%hu\n", session->max_r2t); | |
2309 | break; | |
2310 | case ISCSI_PARAM_IMM_DATA_EN: | |
2311 | len = sprintf(buf, "%d\n", session->imm_data_en); | |
2312 | break; | |
2313 | case ISCSI_PARAM_FIRST_BURST: | |
2314 | len = sprintf(buf, "%u\n", session->first_burst); | |
2315 | break; | |
2316 | case ISCSI_PARAM_MAX_BURST: | |
2317 | len = sprintf(buf, "%u\n", session->max_burst); | |
2318 | break; | |
2319 | case ISCSI_PARAM_PDU_INORDER_EN: | |
2320 | len = sprintf(buf, "%d\n", session->pdu_inorder_en); | |
2321 | break; | |
2322 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
2323 | len = sprintf(buf, "%d\n", session->dataseq_inorder_en); | |
2324 | break; | |
2325 | case ISCSI_PARAM_ERL: | |
2326 | len = sprintf(buf, "%d\n", session->erl); | |
2327 | break; | |
2328 | case ISCSI_PARAM_TARGET_NAME: | |
2329 | len = sprintf(buf, "%s\n", session->targetname); | |
2330 | break; | |
2331 | case ISCSI_PARAM_TPGT: | |
2332 | len = sprintf(buf, "%d\n", session->tpgt); | |
2333 | break; | |
b2c64167 MC |
2334 | case ISCSI_PARAM_USERNAME: |
2335 | len = sprintf(buf, "%s\n", session->username); | |
2336 | break; | |
2337 | case ISCSI_PARAM_USERNAME_IN: | |
2338 | len = sprintf(buf, "%s\n", session->username_in); | |
2339 | break; | |
2340 | case ISCSI_PARAM_PASSWORD: | |
2341 | len = sprintf(buf, "%s\n", session->password); | |
2342 | break; | |
2343 | case ISCSI_PARAM_PASSWORD_IN: | |
2344 | len = sprintf(buf, "%s\n", session->password_in); | |
2345 | break; | |
a54a52ca MC |
2346 | default: |
2347 | return -ENOSYS; | |
2348 | } | |
2349 | ||
2350 | return len; | |
2351 | } | |
2352 | EXPORT_SYMBOL_GPL(iscsi_session_get_param); | |
2353 | ||
2354 | int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn, | |
2355 | enum iscsi_param param, char *buf) | |
2356 | { | |
2357 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2358 | int len; | |
2359 | ||
2360 | switch(param) { | |
f6d5180c MC |
2361 | case ISCSI_PARAM_PING_TMO: |
2362 | len = sprintf(buf, "%u\n", conn->ping_timeout); | |
2363 | break; | |
2364 | case ISCSI_PARAM_RECV_TMO: | |
2365 | len = sprintf(buf, "%u\n", conn->recv_timeout); | |
2366 | break; | |
a54a52ca MC |
2367 | case ISCSI_PARAM_MAX_RECV_DLENGTH: |
2368 | len = sprintf(buf, "%u\n", conn->max_recv_dlength); | |
2369 | break; | |
2370 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
2371 | len = sprintf(buf, "%u\n", conn->max_xmit_dlength); | |
2372 | break; | |
2373 | case ISCSI_PARAM_HDRDGST_EN: | |
2374 | len = sprintf(buf, "%d\n", conn->hdrdgst_en); | |
2375 | break; | |
2376 | case ISCSI_PARAM_DATADGST_EN: | |
2377 | len = sprintf(buf, "%d\n", conn->datadgst_en); | |
2378 | break; | |
2379 | case ISCSI_PARAM_IFMARKER_EN: | |
2380 | len = sprintf(buf, "%d\n", conn->ifmarker_en); | |
2381 | break; | |
2382 | case ISCSI_PARAM_OFMARKER_EN: | |
2383 | len = sprintf(buf, "%d\n", conn->ofmarker_en); | |
2384 | break; | |
2385 | case ISCSI_PARAM_EXP_STATSN: | |
2386 | len = sprintf(buf, "%u\n", conn->exp_statsn); | |
2387 | break; | |
2388 | case ISCSI_PARAM_PERSISTENT_PORT: | |
2389 | len = sprintf(buf, "%d\n", conn->persistent_port); | |
2390 | break; | |
2391 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
2392 | len = sprintf(buf, "%s\n", conn->persistent_address); | |
2393 | break; | |
2394 | default: | |
2395 | return -ENOSYS; | |
2396 | } | |
2397 | ||
2398 | return len; | |
2399 | } | |
2400 | EXPORT_SYMBOL_GPL(iscsi_conn_get_param); | |
2401 | ||
0801c242 MC |
2402 | int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param, |
2403 | char *buf) | |
2404 | { | |
2405 | struct iscsi_session *session = iscsi_hostdata(shost->hostdata); | |
2406 | int len; | |
2407 | ||
2408 | switch (param) { | |
d8196ed2 MC |
2409 | case ISCSI_HOST_PARAM_NETDEV_NAME: |
2410 | if (!session->netdev) | |
2411 | len = sprintf(buf, "%s\n", "default"); | |
2412 | else | |
2413 | len = sprintf(buf, "%s\n", session->netdev); | |
2414 | break; | |
0801c242 MC |
2415 | case ISCSI_HOST_PARAM_HWADDRESS: |
2416 | if (!session->hwaddress) | |
2417 | len = sprintf(buf, "%s\n", "default"); | |
2418 | else | |
2419 | len = sprintf(buf, "%s\n", session->hwaddress); | |
2420 | break; | |
8ad5781a MC |
2421 | case ISCSI_HOST_PARAM_INITIATOR_NAME: |
2422 | if (!session->initiatorname) | |
2423 | len = sprintf(buf, "%s\n", "unknown"); | |
2424 | else | |
2425 | len = sprintf(buf, "%s\n", session->initiatorname); | |
2426 | break; | |
2427 | ||
0801c242 MC |
2428 | default: |
2429 | return -ENOSYS; | |
2430 | } | |
2431 | ||
2432 | return len; | |
2433 | } | |
2434 | EXPORT_SYMBOL_GPL(iscsi_host_get_param); | |
2435 | ||
2436 | int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param, | |
2437 | char *buf, int buflen) | |
2438 | { | |
2439 | struct iscsi_session *session = iscsi_hostdata(shost->hostdata); | |
2440 | ||
2441 | switch (param) { | |
d8196ed2 MC |
2442 | case ISCSI_HOST_PARAM_NETDEV_NAME: |
2443 | if (!session->netdev) | |
2444 | session->netdev = kstrdup(buf, GFP_KERNEL); | |
2445 | break; | |
0801c242 MC |
2446 | case ISCSI_HOST_PARAM_HWADDRESS: |
2447 | if (!session->hwaddress) | |
2448 | session->hwaddress = kstrdup(buf, GFP_KERNEL); | |
2449 | break; | |
8ad5781a MC |
2450 | case ISCSI_HOST_PARAM_INITIATOR_NAME: |
2451 | if (!session->initiatorname) | |
2452 | session->initiatorname = kstrdup(buf, GFP_KERNEL); | |
2453 | break; | |
0801c242 MC |
2454 | default: |
2455 | return -ENOSYS; | |
2456 | } | |
2457 | ||
2458 | return 0; | |
2459 | } | |
2460 | EXPORT_SYMBOL_GPL(iscsi_host_set_param); | |
2461 | ||
7996a778 MC |
2462 | MODULE_AUTHOR("Mike Christie"); |
2463 | MODULE_DESCRIPTION("iSCSI library functions"); | |
2464 | MODULE_LICENSE("GPL"); |