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1 | /* | |
2 | * iSCSI lib functions | |
3 | * | |
4 | * Copyright (C) 2006 Red Hat, Inc. All rights reserved. | |
5 | * Copyright (C) 2004 - 2006 Mike Christie | |
6 | * Copyright (C) 2004 - 2005 Dmitry Yusupov | |
7 | * Copyright (C) 2004 - 2005 Alex Aizman | |
8 | * maintained by open-iscsi@googlegroups.com | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
23 | */ | |
24 | #include <linux/types.h> | |
25 | #include <linux/kfifo.h> | |
26 | #include <linux/delay.h> | |
27 | #include <linux/log2.h> | |
28 | #include <linux/slab.h> | |
29 | #include <asm/unaligned.h> | |
30 | #include <net/tcp.h> | |
31 | #include <scsi/scsi_cmnd.h> | |
32 | #include <scsi/scsi_device.h> | |
33 | #include <scsi/scsi_eh.h> | |
34 | #include <scsi/scsi_tcq.h> | |
35 | #include <scsi/scsi_host.h> | |
36 | #include <scsi/scsi.h> | |
37 | #include <scsi/iscsi_proto.h> | |
38 | #include <scsi/scsi_transport.h> | |
39 | #include <scsi/scsi_transport_iscsi.h> | |
40 | #include <scsi/libiscsi.h> | |
41 | ||
42 | static int iscsi_dbg_lib_conn; | |
43 | module_param_named(debug_libiscsi_conn, iscsi_dbg_lib_conn, int, | |
44 | S_IRUGO | S_IWUSR); | |
45 | MODULE_PARM_DESC(debug_libiscsi_conn, | |
46 | "Turn on debugging for connections in libiscsi module. " | |
47 | "Set to 1 to turn on, and zero to turn off. Default is off."); | |
48 | ||
49 | static int iscsi_dbg_lib_session; | |
50 | module_param_named(debug_libiscsi_session, iscsi_dbg_lib_session, int, | |
51 | S_IRUGO | S_IWUSR); | |
52 | MODULE_PARM_DESC(debug_libiscsi_session, | |
53 | "Turn on debugging for sessions in libiscsi module. " | |
54 | "Set to 1 to turn on, and zero to turn off. Default is off."); | |
55 | ||
56 | static int iscsi_dbg_lib_eh; | |
57 | module_param_named(debug_libiscsi_eh, iscsi_dbg_lib_eh, int, | |
58 | S_IRUGO | S_IWUSR); | |
59 | MODULE_PARM_DESC(debug_libiscsi_eh, | |
60 | "Turn on debugging for error handling in libiscsi module. " | |
61 | "Set to 1 to turn on, and zero to turn off. Default is off."); | |
62 | ||
63 | #define ISCSI_DBG_CONN(_conn, dbg_fmt, arg...) \ | |
64 | do { \ | |
65 | if (iscsi_dbg_lib_conn) \ | |
66 | iscsi_conn_printk(KERN_INFO, _conn, \ | |
67 | "%s " dbg_fmt, \ | |
68 | __func__, ##arg); \ | |
69 | } while (0); | |
70 | ||
71 | #define ISCSI_DBG_SESSION(_session, dbg_fmt, arg...) \ | |
72 | do { \ | |
73 | if (iscsi_dbg_lib_session) \ | |
74 | iscsi_session_printk(KERN_INFO, _session, \ | |
75 | "%s " dbg_fmt, \ | |
76 | __func__, ##arg); \ | |
77 | } while (0); | |
78 | ||
79 | #define ISCSI_DBG_EH(_session, dbg_fmt, arg...) \ | |
80 | do { \ | |
81 | if (iscsi_dbg_lib_eh) \ | |
82 | iscsi_session_printk(KERN_INFO, _session, \ | |
83 | "%s " dbg_fmt, \ | |
84 | __func__, ##arg); \ | |
85 | } while (0); | |
86 | ||
87 | /* Serial Number Arithmetic, 32 bits, less than, RFC1982 */ | |
88 | #define SNA32_CHECK 2147483648UL | |
89 | ||
90 | static int iscsi_sna_lt(u32 n1, u32 n2) | |
91 | { | |
92 | return n1 != n2 && ((n1 < n2 && (n2 - n1 < SNA32_CHECK)) || | |
93 | (n1 > n2 && (n2 - n1 < SNA32_CHECK))); | |
94 | } | |
95 | ||
96 | /* Serial Number Arithmetic, 32 bits, less than, RFC1982 */ | |
97 | static int iscsi_sna_lte(u32 n1, u32 n2) | |
98 | { | |
99 | return n1 == n2 || ((n1 < n2 && (n2 - n1 < SNA32_CHECK)) || | |
100 | (n1 > n2 && (n2 - n1 < SNA32_CHECK))); | |
101 | } | |
102 | ||
103 | inline void iscsi_conn_queue_work(struct iscsi_conn *conn) | |
104 | { | |
105 | struct Scsi_Host *shost = conn->session->host; | |
106 | struct iscsi_host *ihost = shost_priv(shost); | |
107 | ||
108 | if (ihost->workq) | |
109 | queue_work(ihost->workq, &conn->xmitwork); | |
110 | } | |
111 | EXPORT_SYMBOL_GPL(iscsi_conn_queue_work); | |
112 | ||
113 | static void __iscsi_update_cmdsn(struct iscsi_session *session, | |
114 | uint32_t exp_cmdsn, uint32_t max_cmdsn) | |
115 | { | |
116 | /* | |
117 | * standard specifies this check for when to update expected and | |
118 | * max sequence numbers | |
119 | */ | |
120 | if (iscsi_sna_lt(max_cmdsn, exp_cmdsn - 1)) | |
121 | return; | |
122 | ||
123 | if (exp_cmdsn != session->exp_cmdsn && | |
124 | !iscsi_sna_lt(exp_cmdsn, session->exp_cmdsn)) | |
125 | session->exp_cmdsn = exp_cmdsn; | |
126 | ||
127 | if (max_cmdsn != session->max_cmdsn && | |
128 | !iscsi_sna_lt(max_cmdsn, session->max_cmdsn)) { | |
129 | session->max_cmdsn = max_cmdsn; | |
130 | /* | |
131 | * if the window closed with IO queued, then kick the | |
132 | * xmit thread | |
133 | */ | |
134 | if (!list_empty(&session->leadconn->cmdqueue) || | |
135 | !list_empty(&session->leadconn->mgmtqueue)) | |
136 | iscsi_conn_queue_work(session->leadconn); | |
137 | } | |
138 | } | |
139 | ||
140 | void iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr) | |
141 | { | |
142 | __iscsi_update_cmdsn(session, be32_to_cpu(hdr->exp_cmdsn), | |
143 | be32_to_cpu(hdr->max_cmdsn)); | |
144 | } | |
145 | EXPORT_SYMBOL_GPL(iscsi_update_cmdsn); | |
146 | ||
147 | /** | |
148 | * iscsi_prep_data_out_pdu - initialize Data-Out | |
149 | * @task: scsi command task | |
150 | * @r2t: R2T info | |
151 | * @hdr: iscsi data in pdu | |
152 | * | |
153 | * Notes: | |
154 | * Initialize Data-Out within this R2T sequence and finds | |
155 | * proper data_offset within this SCSI command. | |
156 | * | |
157 | * This function is called with connection lock taken. | |
158 | **/ | |
159 | void iscsi_prep_data_out_pdu(struct iscsi_task *task, struct iscsi_r2t_info *r2t, | |
160 | struct iscsi_data *hdr) | |
161 | { | |
162 | struct iscsi_conn *conn = task->conn; | |
163 | unsigned int left = r2t->data_length - r2t->sent; | |
164 | ||
165 | task->hdr_len = sizeof(struct iscsi_data); | |
166 | ||
167 | memset(hdr, 0, sizeof(struct iscsi_data)); | |
168 | hdr->ttt = r2t->ttt; | |
169 | hdr->datasn = cpu_to_be32(r2t->datasn); | |
170 | r2t->datasn++; | |
171 | hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; | |
172 | memcpy(hdr->lun, task->lun, sizeof(hdr->lun)); | |
173 | hdr->itt = task->hdr_itt; | |
174 | hdr->exp_statsn = r2t->exp_statsn; | |
175 | hdr->offset = cpu_to_be32(r2t->data_offset + r2t->sent); | |
176 | if (left > conn->max_xmit_dlength) { | |
177 | hton24(hdr->dlength, conn->max_xmit_dlength); | |
178 | r2t->data_count = conn->max_xmit_dlength; | |
179 | hdr->flags = 0; | |
180 | } else { | |
181 | hton24(hdr->dlength, left); | |
182 | r2t->data_count = left; | |
183 | hdr->flags = ISCSI_FLAG_CMD_FINAL; | |
184 | } | |
185 | conn->dataout_pdus_cnt++; | |
186 | } | |
187 | EXPORT_SYMBOL_GPL(iscsi_prep_data_out_pdu); | |
188 | ||
189 | static int iscsi_add_hdr(struct iscsi_task *task, unsigned len) | |
190 | { | |
191 | unsigned exp_len = task->hdr_len + len; | |
192 | ||
193 | if (exp_len > task->hdr_max) { | |
194 | WARN_ON(1); | |
195 | return -EINVAL; | |
196 | } | |
197 | ||
198 | WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */ | |
199 | task->hdr_len = exp_len; | |
200 | return 0; | |
201 | } | |
202 | ||
203 | /* | |
204 | * make an extended cdb AHS | |
205 | */ | |
206 | static int iscsi_prep_ecdb_ahs(struct iscsi_task *task) | |
207 | { | |
208 | struct scsi_cmnd *cmd = task->sc; | |
209 | unsigned rlen, pad_len; | |
210 | unsigned short ahslength; | |
211 | struct iscsi_ecdb_ahdr *ecdb_ahdr; | |
212 | int rc; | |
213 | ||
214 | ecdb_ahdr = iscsi_next_hdr(task); | |
215 | rlen = cmd->cmd_len - ISCSI_CDB_SIZE; | |
216 | ||
217 | BUG_ON(rlen > sizeof(ecdb_ahdr->ecdb)); | |
218 | ahslength = rlen + sizeof(ecdb_ahdr->reserved); | |
219 | ||
220 | pad_len = iscsi_padding(rlen); | |
221 | ||
222 | rc = iscsi_add_hdr(task, sizeof(ecdb_ahdr->ahslength) + | |
223 | sizeof(ecdb_ahdr->ahstype) + ahslength + pad_len); | |
224 | if (rc) | |
225 | return rc; | |
226 | ||
227 | if (pad_len) | |
228 | memset(&ecdb_ahdr->ecdb[rlen], 0, pad_len); | |
229 | ||
230 | ecdb_ahdr->ahslength = cpu_to_be16(ahslength); | |
231 | ecdb_ahdr->ahstype = ISCSI_AHSTYPE_CDB; | |
232 | ecdb_ahdr->reserved = 0; | |
233 | memcpy(ecdb_ahdr->ecdb, cmd->cmnd + ISCSI_CDB_SIZE, rlen); | |
234 | ||
235 | ISCSI_DBG_SESSION(task->conn->session, | |
236 | "iscsi_prep_ecdb_ahs: varlen_cdb_len %d " | |
237 | "rlen %d pad_len %d ahs_length %d iscsi_headers_size " | |
238 | "%u\n", cmd->cmd_len, rlen, pad_len, ahslength, | |
239 | task->hdr_len); | |
240 | return 0; | |
241 | } | |
242 | ||
243 | static int iscsi_prep_bidi_ahs(struct iscsi_task *task) | |
244 | { | |
245 | struct scsi_cmnd *sc = task->sc; | |
246 | struct iscsi_rlength_ahdr *rlen_ahdr; | |
247 | int rc; | |
248 | ||
249 | rlen_ahdr = iscsi_next_hdr(task); | |
250 | rc = iscsi_add_hdr(task, sizeof(*rlen_ahdr)); | |
251 | if (rc) | |
252 | return rc; | |
253 | ||
254 | rlen_ahdr->ahslength = | |
255 | cpu_to_be16(sizeof(rlen_ahdr->read_length) + | |
256 | sizeof(rlen_ahdr->reserved)); | |
257 | rlen_ahdr->ahstype = ISCSI_AHSTYPE_RLENGTH; | |
258 | rlen_ahdr->reserved = 0; | |
259 | rlen_ahdr->read_length = cpu_to_be32(scsi_in(sc)->length); | |
260 | ||
261 | ISCSI_DBG_SESSION(task->conn->session, | |
262 | "bidi-in rlen_ahdr->read_length(%d) " | |
263 | "rlen_ahdr->ahslength(%d)\n", | |
264 | be32_to_cpu(rlen_ahdr->read_length), | |
265 | be16_to_cpu(rlen_ahdr->ahslength)); | |
266 | return 0; | |
267 | } | |
268 | ||
269 | /** | |
270 | * iscsi_check_tmf_restrictions - check if a task is affected by TMF | |
271 | * @task: iscsi task | |
272 | * @opcode: opcode to check for | |
273 | * | |
274 | * During TMF a task has to be checked if it's affected. | |
275 | * All unrelated I/O can be passed through, but I/O to the | |
276 | * affected LUN should be restricted. | |
277 | * If 'fast_abort' is set we won't be sending any I/O to the | |
278 | * affected LUN. | |
279 | * Otherwise the target is waiting for all TTTs to be completed, | |
280 | * so we have to send all outstanding Data-Out PDUs to the target. | |
281 | */ | |
282 | static int iscsi_check_tmf_restrictions(struct iscsi_task *task, int opcode) | |
283 | { | |
284 | struct iscsi_conn *conn = task->conn; | |
285 | struct iscsi_tm *tmf = &conn->tmhdr; | |
286 | unsigned int hdr_lun; | |
287 | ||
288 | if (conn->tmf_state == TMF_INITIAL) | |
289 | return 0; | |
290 | ||
291 | if ((tmf->opcode & ISCSI_OPCODE_MASK) != ISCSI_OP_SCSI_TMFUNC) | |
292 | return 0; | |
293 | ||
294 | switch (ISCSI_TM_FUNC_VALUE(tmf)) { | |
295 | case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: | |
296 | /* | |
297 | * Allow PDUs for unrelated LUNs | |
298 | */ | |
299 | hdr_lun = scsilun_to_int((struct scsi_lun *)tmf->lun); | |
300 | if (hdr_lun != task->sc->device->lun) | |
301 | return 0; | |
302 | /* fall through */ | |
303 | case ISCSI_TM_FUNC_TARGET_WARM_RESET: | |
304 | /* | |
305 | * Fail all SCSI cmd PDUs | |
306 | */ | |
307 | if (opcode != ISCSI_OP_SCSI_DATA_OUT) { | |
308 | iscsi_conn_printk(KERN_INFO, conn, | |
309 | "task [op %x/%x itt " | |
310 | "0x%x/0x%x] " | |
311 | "rejected.\n", | |
312 | task->hdr->opcode, opcode, | |
313 | task->itt, task->hdr_itt); | |
314 | return -EACCES; | |
315 | } | |
316 | /* | |
317 | * And also all data-out PDUs in response to R2T | |
318 | * if fast_abort is set. | |
319 | */ | |
320 | if (conn->session->fast_abort) { | |
321 | iscsi_conn_printk(KERN_INFO, conn, | |
322 | "task [op %x/%x itt " | |
323 | "0x%x/0x%x] fast abort.\n", | |
324 | task->hdr->opcode, opcode, | |
325 | task->itt, task->hdr_itt); | |
326 | return -EACCES; | |
327 | } | |
328 | break; | |
329 | case ISCSI_TM_FUNC_ABORT_TASK: | |
330 | /* | |
331 | * the caller has already checked if the task | |
332 | * they want to abort was in the pending queue so if | |
333 | * we are here the cmd pdu has gone out already, and | |
334 | * we will only hit this for data-outs | |
335 | */ | |
336 | if (opcode == ISCSI_OP_SCSI_DATA_OUT && | |
337 | task->hdr_itt == tmf->rtt) { | |
338 | ISCSI_DBG_SESSION(conn->session, | |
339 | "Preventing task %x/%x from sending " | |
340 | "data-out due to abort task in " | |
341 | "progress\n", task->itt, | |
342 | task->hdr_itt); | |
343 | return -EACCES; | |
344 | } | |
345 | break; | |
346 | } | |
347 | ||
348 | return 0; | |
349 | } | |
350 | ||
351 | /** | |
352 | * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu | |
353 | * @task: iscsi task | |
354 | * | |
355 | * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set | |
356 | * fields like dlength or final based on how much data it sends | |
357 | */ | |
358 | static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task) | |
359 | { | |
360 | struct iscsi_conn *conn = task->conn; | |
361 | struct iscsi_session *session = conn->session; | |
362 | struct scsi_cmnd *sc = task->sc; | |
363 | struct iscsi_cmd *hdr; | |
364 | unsigned hdrlength, cmd_len; | |
365 | itt_t itt; | |
366 | int rc; | |
367 | ||
368 | rc = iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_CMD); | |
369 | if (rc) | |
370 | return rc; | |
371 | ||
372 | if (conn->session->tt->alloc_pdu) { | |
373 | rc = conn->session->tt->alloc_pdu(task, ISCSI_OP_SCSI_CMD); | |
374 | if (rc) | |
375 | return rc; | |
376 | } | |
377 | hdr = (struct iscsi_cmd *) task->hdr; | |
378 | itt = hdr->itt; | |
379 | memset(hdr, 0, sizeof(*hdr)); | |
380 | ||
381 | if (session->tt->parse_pdu_itt) | |
382 | hdr->itt = task->hdr_itt = itt; | |
383 | else | |
384 | hdr->itt = task->hdr_itt = build_itt(task->itt, | |
385 | task->conn->session->age); | |
386 | task->hdr_len = 0; | |
387 | rc = iscsi_add_hdr(task, sizeof(*hdr)); | |
388 | if (rc) | |
389 | return rc; | |
390 | hdr->opcode = ISCSI_OP_SCSI_CMD; | |
391 | hdr->flags = ISCSI_ATTR_SIMPLE; | |
392 | int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun); | |
393 | memcpy(task->lun, hdr->lun, sizeof(task->lun)); | |
394 | hdr->exp_statsn = cpu_to_be32(conn->exp_statsn); | |
395 | cmd_len = sc->cmd_len; | |
396 | if (cmd_len < ISCSI_CDB_SIZE) | |
397 | memset(&hdr->cdb[cmd_len], 0, ISCSI_CDB_SIZE - cmd_len); | |
398 | else if (cmd_len > ISCSI_CDB_SIZE) { | |
399 | rc = iscsi_prep_ecdb_ahs(task); | |
400 | if (rc) | |
401 | return rc; | |
402 | cmd_len = ISCSI_CDB_SIZE; | |
403 | } | |
404 | memcpy(hdr->cdb, sc->cmnd, cmd_len); | |
405 | ||
406 | task->imm_count = 0; | |
407 | if (scsi_bidi_cmnd(sc)) { | |
408 | hdr->flags |= ISCSI_FLAG_CMD_READ; | |
409 | rc = iscsi_prep_bidi_ahs(task); | |
410 | if (rc) | |
411 | return rc; | |
412 | } | |
413 | if (sc->sc_data_direction == DMA_TO_DEVICE) { | |
414 | unsigned out_len = scsi_out(sc)->length; | |
415 | struct iscsi_r2t_info *r2t = &task->unsol_r2t; | |
416 | ||
417 | hdr->data_length = cpu_to_be32(out_len); | |
418 | hdr->flags |= ISCSI_FLAG_CMD_WRITE; | |
419 | /* | |
420 | * Write counters: | |
421 | * | |
422 | * imm_count bytes to be sent right after | |
423 | * SCSI PDU Header | |
424 | * | |
425 | * unsol_count bytes(as Data-Out) to be sent | |
426 | * without R2T ack right after | |
427 | * immediate data | |
428 | * | |
429 | * r2t data_length bytes to be sent via R2T ack's | |
430 | * | |
431 | * pad_count bytes to be sent as zero-padding | |
432 | */ | |
433 | memset(r2t, 0, sizeof(*r2t)); | |
434 | ||
435 | if (session->imm_data_en) { | |
436 | if (out_len >= session->first_burst) | |
437 | task->imm_count = min(session->first_burst, | |
438 | conn->max_xmit_dlength); | |
439 | else | |
440 | task->imm_count = min(out_len, | |
441 | conn->max_xmit_dlength); | |
442 | hton24(hdr->dlength, task->imm_count); | |
443 | } else | |
444 | zero_data(hdr->dlength); | |
445 | ||
446 | if (!session->initial_r2t_en) { | |
447 | r2t->data_length = min(session->first_burst, out_len) - | |
448 | task->imm_count; | |
449 | r2t->data_offset = task->imm_count; | |
450 | r2t->ttt = cpu_to_be32(ISCSI_RESERVED_TAG); | |
451 | r2t->exp_statsn = cpu_to_be32(conn->exp_statsn); | |
452 | } | |
453 | ||
454 | if (!task->unsol_r2t.data_length) | |
455 | /* No unsolicit Data-Out's */ | |
456 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
457 | } else { | |
458 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
459 | zero_data(hdr->dlength); | |
460 | hdr->data_length = cpu_to_be32(scsi_in(sc)->length); | |
461 | ||
462 | if (sc->sc_data_direction == DMA_FROM_DEVICE) | |
463 | hdr->flags |= ISCSI_FLAG_CMD_READ; | |
464 | } | |
465 | ||
466 | /* calculate size of additional header segments (AHSs) */ | |
467 | hdrlength = task->hdr_len - sizeof(*hdr); | |
468 | ||
469 | WARN_ON(hdrlength & (ISCSI_PAD_LEN-1)); | |
470 | hdrlength /= ISCSI_PAD_LEN; | |
471 | ||
472 | WARN_ON(hdrlength >= 256); | |
473 | hdr->hlength = hdrlength & 0xFF; | |
474 | hdr->cmdsn = task->cmdsn = cpu_to_be32(session->cmdsn); | |
475 | ||
476 | if (session->tt->init_task && session->tt->init_task(task)) | |
477 | return -EIO; | |
478 | ||
479 | task->state = ISCSI_TASK_RUNNING; | |
480 | session->cmdsn++; | |
481 | ||
482 | conn->scsicmd_pdus_cnt++; | |
483 | ISCSI_DBG_SESSION(session, "iscsi prep [%s cid %d sc %p cdb 0x%x " | |
484 | "itt 0x%x len %d bidi_len %d cmdsn %d win %d]\n", | |
485 | scsi_bidi_cmnd(sc) ? "bidirectional" : | |
486 | sc->sc_data_direction == DMA_TO_DEVICE ? | |
487 | "write" : "read", conn->id, sc, sc->cmnd[0], | |
488 | task->itt, scsi_bufflen(sc), | |
489 | scsi_bidi_cmnd(sc) ? scsi_in(sc)->length : 0, | |
490 | session->cmdsn, | |
491 | session->max_cmdsn - session->exp_cmdsn + 1); | |
492 | return 0; | |
493 | } | |
494 | ||
495 | /** | |
496 | * iscsi_free_task - free a task | |
497 | * @task: iscsi cmd task | |
498 | * | |
499 | * Must be called with session lock. | |
500 | * This function returns the scsi command to scsi-ml or cleans | |
501 | * up mgmt tasks then returns the task to the pool. | |
502 | */ | |
503 | static void iscsi_free_task(struct iscsi_task *task) | |
504 | { | |
505 | struct iscsi_conn *conn = task->conn; | |
506 | struct iscsi_session *session = conn->session; | |
507 | struct scsi_cmnd *sc = task->sc; | |
508 | ||
509 | ISCSI_DBG_SESSION(session, "freeing task itt 0x%x state %d sc %p\n", | |
510 | task->itt, task->state, task->sc); | |
511 | ||
512 | session->tt->cleanup_task(task); | |
513 | task->state = ISCSI_TASK_FREE; | |
514 | task->sc = NULL; | |
515 | /* | |
516 | * login task is preallocated so do not free | |
517 | */ | |
518 | if (conn->login_task == task) | |
519 | return; | |
520 | ||
521 | kfifo_in(&session->cmdpool.queue, (void*)&task, sizeof(void*)); | |
522 | ||
523 | if (sc) { | |
524 | task->sc = NULL; | |
525 | /* SCSI eh reuses commands to verify us */ | |
526 | sc->SCp.ptr = NULL; | |
527 | /* | |
528 | * queue command may call this to free the task, but | |
529 | * not have setup the sc callback | |
530 | */ | |
531 | if (sc->scsi_done) | |
532 | sc->scsi_done(sc); | |
533 | } | |
534 | } | |
535 | ||
536 | void __iscsi_get_task(struct iscsi_task *task) | |
537 | { | |
538 | atomic_inc(&task->refcount); | |
539 | } | |
540 | EXPORT_SYMBOL_GPL(__iscsi_get_task); | |
541 | ||
542 | static void __iscsi_put_task(struct iscsi_task *task) | |
543 | { | |
544 | if (atomic_dec_and_test(&task->refcount)) | |
545 | iscsi_free_task(task); | |
546 | } | |
547 | ||
548 | void iscsi_put_task(struct iscsi_task *task) | |
549 | { | |
550 | struct iscsi_session *session = task->conn->session; | |
551 | ||
552 | spin_lock_bh(&session->lock); | |
553 | __iscsi_put_task(task); | |
554 | spin_unlock_bh(&session->lock); | |
555 | } | |
556 | EXPORT_SYMBOL_GPL(iscsi_put_task); | |
557 | ||
558 | /** | |
559 | * iscsi_complete_task - finish a task | |
560 | * @task: iscsi cmd task | |
561 | * @state: state to complete task with | |
562 | * | |
563 | * Must be called with session lock. | |
564 | */ | |
565 | static void iscsi_complete_task(struct iscsi_task *task, int state) | |
566 | { | |
567 | struct iscsi_conn *conn = task->conn; | |
568 | ||
569 | ISCSI_DBG_SESSION(conn->session, | |
570 | "complete task itt 0x%x state %d sc %p\n", | |
571 | task->itt, task->state, task->sc); | |
572 | if (task->state == ISCSI_TASK_COMPLETED || | |
573 | task->state == ISCSI_TASK_ABRT_TMF || | |
574 | task->state == ISCSI_TASK_ABRT_SESS_RECOV) | |
575 | return; | |
576 | WARN_ON_ONCE(task->state == ISCSI_TASK_FREE); | |
577 | task->state = state; | |
578 | ||
579 | if (!list_empty(&task->running)) | |
580 | list_del_init(&task->running); | |
581 | ||
582 | if (conn->task == task) | |
583 | conn->task = NULL; | |
584 | ||
585 | if (conn->ping_task == task) | |
586 | conn->ping_task = NULL; | |
587 | ||
588 | /* release get from queueing */ | |
589 | __iscsi_put_task(task); | |
590 | } | |
591 | ||
592 | /** | |
593 | * iscsi_complete_scsi_task - finish scsi task normally | |
594 | * @task: iscsi task for scsi cmd | |
595 | * @exp_cmdsn: expected cmd sn in cpu format | |
596 | * @max_cmdsn: max cmd sn in cpu format | |
597 | * | |
598 | * This is used when drivers do not need or cannot perform | |
599 | * lower level pdu processing. | |
600 | * | |
601 | * Called with session lock | |
602 | */ | |
603 | void iscsi_complete_scsi_task(struct iscsi_task *task, | |
604 | uint32_t exp_cmdsn, uint32_t max_cmdsn) | |
605 | { | |
606 | struct iscsi_conn *conn = task->conn; | |
607 | ||
608 | ISCSI_DBG_SESSION(conn->session, "[itt 0x%x]\n", task->itt); | |
609 | ||
610 | conn->last_recv = jiffies; | |
611 | __iscsi_update_cmdsn(conn->session, exp_cmdsn, max_cmdsn); | |
612 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); | |
613 | } | |
614 | EXPORT_SYMBOL_GPL(iscsi_complete_scsi_task); | |
615 | ||
616 | ||
617 | /* | |
618 | * session lock must be held and if not called for a task that is | |
619 | * still pending or from the xmit thread, then xmit thread must | |
620 | * be suspended. | |
621 | */ | |
622 | static void fail_scsi_task(struct iscsi_task *task, int err) | |
623 | { | |
624 | struct iscsi_conn *conn = task->conn; | |
625 | struct scsi_cmnd *sc; | |
626 | int state; | |
627 | ||
628 | /* | |
629 | * if a command completes and we get a successful tmf response | |
630 | * we will hit this because the scsi eh abort code does not take | |
631 | * a ref to the task. | |
632 | */ | |
633 | sc = task->sc; | |
634 | if (!sc) | |
635 | return; | |
636 | ||
637 | if (task->state == ISCSI_TASK_PENDING) { | |
638 | /* | |
639 | * cmd never made it to the xmit thread, so we should not count | |
640 | * the cmd in the sequencing | |
641 | */ | |
642 | conn->session->queued_cmdsn--; | |
643 | /* it was never sent so just complete like normal */ | |
644 | state = ISCSI_TASK_COMPLETED; | |
645 | } else if (err == DID_TRANSPORT_DISRUPTED) | |
646 | state = ISCSI_TASK_ABRT_SESS_RECOV; | |
647 | else | |
648 | state = ISCSI_TASK_ABRT_TMF; | |
649 | ||
650 | sc->result = err << 16; | |
651 | if (!scsi_bidi_cmnd(sc)) | |
652 | scsi_set_resid(sc, scsi_bufflen(sc)); | |
653 | else { | |
654 | scsi_out(sc)->resid = scsi_out(sc)->length; | |
655 | scsi_in(sc)->resid = scsi_in(sc)->length; | |
656 | } | |
657 | ||
658 | iscsi_complete_task(task, state); | |
659 | } | |
660 | ||
661 | static int iscsi_prep_mgmt_task(struct iscsi_conn *conn, | |
662 | struct iscsi_task *task) | |
663 | { | |
664 | struct iscsi_session *session = conn->session; | |
665 | struct iscsi_hdr *hdr = task->hdr; | |
666 | struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr; | |
667 | uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK; | |
668 | ||
669 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) | |
670 | return -ENOTCONN; | |
671 | ||
672 | if (opcode != ISCSI_OP_LOGIN && opcode != ISCSI_OP_TEXT) | |
673 | nop->exp_statsn = cpu_to_be32(conn->exp_statsn); | |
674 | /* | |
675 | * pre-format CmdSN for outgoing PDU. | |
676 | */ | |
677 | nop->cmdsn = cpu_to_be32(session->cmdsn); | |
678 | if (hdr->itt != RESERVED_ITT) { | |
679 | /* | |
680 | * TODO: We always use immediate for normal session pdus. | |
681 | * If we start to send tmfs or nops as non-immediate then | |
682 | * we should start checking the cmdsn numbers for mgmt tasks. | |
683 | * | |
684 | * During discovery sessions iscsid sends TEXT as non immediate, | |
685 | * but we always only send one PDU at a time. | |
686 | */ | |
687 | if (conn->c_stage == ISCSI_CONN_STARTED && | |
688 | !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { | |
689 | session->queued_cmdsn++; | |
690 | session->cmdsn++; | |
691 | } | |
692 | } | |
693 | ||
694 | if (session->tt->init_task && session->tt->init_task(task)) | |
695 | return -EIO; | |
696 | ||
697 | if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT) | |
698 | session->state = ISCSI_STATE_LOGGING_OUT; | |
699 | ||
700 | task->state = ISCSI_TASK_RUNNING; | |
701 | ISCSI_DBG_SESSION(session, "mgmtpdu [op 0x%x hdr->itt 0x%x " | |
702 | "datalen %d]\n", hdr->opcode & ISCSI_OPCODE_MASK, | |
703 | hdr->itt, task->data_count); | |
704 | return 0; | |
705 | } | |
706 | ||
707 | static struct iscsi_task * | |
708 | __iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
709 | char *data, uint32_t data_size) | |
710 | { | |
711 | struct iscsi_session *session = conn->session; | |
712 | struct iscsi_host *ihost = shost_priv(session->host); | |
713 | uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK; | |
714 | struct iscsi_task *task; | |
715 | itt_t itt; | |
716 | ||
717 | if (session->state == ISCSI_STATE_TERMINATE) | |
718 | return NULL; | |
719 | ||
720 | if (opcode == ISCSI_OP_LOGIN || opcode == ISCSI_OP_TEXT) { | |
721 | /* | |
722 | * Login and Text are sent serially, in | |
723 | * request-followed-by-response sequence. | |
724 | * Same task can be used. Same ITT must be used. | |
725 | * Note that login_task is preallocated at conn_create(). | |
726 | */ | |
727 | if (conn->login_task->state != ISCSI_TASK_FREE) { | |
728 | iscsi_conn_printk(KERN_ERR, conn, "Login/Text in " | |
729 | "progress. Cannot start new task.\n"); | |
730 | return NULL; | |
731 | } | |
732 | ||
733 | task = conn->login_task; | |
734 | } else { | |
735 | if (session->state != ISCSI_STATE_LOGGED_IN) | |
736 | return NULL; | |
737 | ||
738 | BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE); | |
739 | BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED); | |
740 | ||
741 | if (!kfifo_out(&session->cmdpool.queue, | |
742 | (void*)&task, sizeof(void*))) | |
743 | return NULL; | |
744 | } | |
745 | /* | |
746 | * released in complete pdu for task we expect a response for, and | |
747 | * released by the lld when it has transmitted the task for | |
748 | * pdus we do not expect a response for. | |
749 | */ | |
750 | atomic_set(&task->refcount, 1); | |
751 | task->conn = conn; | |
752 | task->sc = NULL; | |
753 | INIT_LIST_HEAD(&task->running); | |
754 | task->state = ISCSI_TASK_PENDING; | |
755 | ||
756 | if (data_size) { | |
757 | memcpy(task->data, data, data_size); | |
758 | task->data_count = data_size; | |
759 | } else | |
760 | task->data_count = 0; | |
761 | ||
762 | if (conn->session->tt->alloc_pdu) { | |
763 | if (conn->session->tt->alloc_pdu(task, hdr->opcode)) { | |
764 | iscsi_conn_printk(KERN_ERR, conn, "Could not allocate " | |
765 | "pdu for mgmt task.\n"); | |
766 | goto free_task; | |
767 | } | |
768 | } | |
769 | ||
770 | itt = task->hdr->itt; | |
771 | task->hdr_len = sizeof(struct iscsi_hdr); | |
772 | memcpy(task->hdr, hdr, sizeof(struct iscsi_hdr)); | |
773 | ||
774 | if (hdr->itt != RESERVED_ITT) { | |
775 | if (session->tt->parse_pdu_itt) | |
776 | task->hdr->itt = itt; | |
777 | else | |
778 | task->hdr->itt = build_itt(task->itt, | |
779 | task->conn->session->age); | |
780 | } | |
781 | ||
782 | if (!ihost->workq) { | |
783 | if (iscsi_prep_mgmt_task(conn, task)) | |
784 | goto free_task; | |
785 | ||
786 | if (session->tt->xmit_task(task)) | |
787 | goto free_task; | |
788 | } else { | |
789 | list_add_tail(&task->running, &conn->mgmtqueue); | |
790 | iscsi_conn_queue_work(conn); | |
791 | } | |
792 | ||
793 | return task; | |
794 | ||
795 | free_task: | |
796 | __iscsi_put_task(task); | |
797 | return NULL; | |
798 | } | |
799 | ||
800 | int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr, | |
801 | char *data, uint32_t data_size) | |
802 | { | |
803 | struct iscsi_conn *conn = cls_conn->dd_data; | |
804 | struct iscsi_session *session = conn->session; | |
805 | int err = 0; | |
806 | ||
807 | spin_lock_bh(&session->lock); | |
808 | if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size)) | |
809 | err = -EPERM; | |
810 | spin_unlock_bh(&session->lock); | |
811 | return err; | |
812 | } | |
813 | EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu); | |
814 | ||
815 | /** | |
816 | * iscsi_cmd_rsp - SCSI Command Response processing | |
817 | * @conn: iscsi connection | |
818 | * @hdr: iscsi header | |
819 | * @task: scsi command task | |
820 | * @data: cmd data buffer | |
821 | * @datalen: len of buffer | |
822 | * | |
823 | * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and | |
824 | * then completes the command and task. | |
825 | **/ | |
826 | static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
827 | struct iscsi_task *task, char *data, | |
828 | int datalen) | |
829 | { | |
830 | struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)hdr; | |
831 | struct iscsi_session *session = conn->session; | |
832 | struct scsi_cmnd *sc = task->sc; | |
833 | ||
834 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr); | |
835 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; | |
836 | ||
837 | sc->result = (DID_OK << 16) | rhdr->cmd_status; | |
838 | ||
839 | if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) { | |
840 | sc->result = DID_ERROR << 16; | |
841 | goto out; | |
842 | } | |
843 | ||
844 | if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) { | |
845 | uint16_t senselen; | |
846 | ||
847 | if (datalen < 2) { | |
848 | invalid_datalen: | |
849 | iscsi_conn_printk(KERN_ERR, conn, | |
850 | "Got CHECK_CONDITION but invalid data " | |
851 | "buffer size of %d\n", datalen); | |
852 | sc->result = DID_BAD_TARGET << 16; | |
853 | goto out; | |
854 | } | |
855 | ||
856 | senselen = get_unaligned_be16(data); | |
857 | if (datalen < senselen) | |
858 | goto invalid_datalen; | |
859 | ||
860 | memcpy(sc->sense_buffer, data + 2, | |
861 | min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE)); | |
862 | ISCSI_DBG_SESSION(session, "copied %d bytes of sense\n", | |
863 | min_t(uint16_t, senselen, | |
864 | SCSI_SENSE_BUFFERSIZE)); | |
865 | } | |
866 | ||
867 | if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW | | |
868 | ISCSI_FLAG_CMD_BIDI_OVERFLOW)) { | |
869 | int res_count = be32_to_cpu(rhdr->bi_residual_count); | |
870 | ||
871 | if (scsi_bidi_cmnd(sc) && res_count > 0 && | |
872 | (rhdr->flags & ISCSI_FLAG_CMD_BIDI_OVERFLOW || | |
873 | res_count <= scsi_in(sc)->length)) | |
874 | scsi_in(sc)->resid = res_count; | |
875 | else | |
876 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
877 | } | |
878 | ||
879 | if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW | | |
880 | ISCSI_FLAG_CMD_OVERFLOW)) { | |
881 | int res_count = be32_to_cpu(rhdr->residual_count); | |
882 | ||
883 | if (res_count > 0 && | |
884 | (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || | |
885 | res_count <= scsi_bufflen(sc))) | |
886 | /* write side for bidi or uni-io set_resid */ | |
887 | scsi_set_resid(sc, res_count); | |
888 | else | |
889 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
890 | } | |
891 | out: | |
892 | ISCSI_DBG_SESSION(session, "cmd rsp done [sc %p res %d itt 0x%x]\n", | |
893 | sc, sc->result, task->itt); | |
894 | conn->scsirsp_pdus_cnt++; | |
895 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); | |
896 | } | |
897 | ||
898 | /** | |
899 | * iscsi_data_in_rsp - SCSI Data-In Response processing | |
900 | * @conn: iscsi connection | |
901 | * @hdr: iscsi pdu | |
902 | * @task: scsi command task | |
903 | **/ | |
904 | static void | |
905 | iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
906 | struct iscsi_task *task) | |
907 | { | |
908 | struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)hdr; | |
909 | struct scsi_cmnd *sc = task->sc; | |
910 | ||
911 | if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS)) | |
912 | return; | |
913 | ||
914 | iscsi_update_cmdsn(conn->session, (struct iscsi_nopin *)hdr); | |
915 | sc->result = (DID_OK << 16) | rhdr->cmd_status; | |
916 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; | |
917 | if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW | | |
918 | ISCSI_FLAG_DATA_OVERFLOW)) { | |
919 | int res_count = be32_to_cpu(rhdr->residual_count); | |
920 | ||
921 | if (res_count > 0 && | |
922 | (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || | |
923 | res_count <= scsi_in(sc)->length)) | |
924 | scsi_in(sc)->resid = res_count; | |
925 | else | |
926 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
927 | } | |
928 | ||
929 | ISCSI_DBG_SESSION(conn->session, "data in with status done " | |
930 | "[sc %p res %d itt 0x%x]\n", | |
931 | sc, sc->result, task->itt); | |
932 | conn->scsirsp_pdus_cnt++; | |
933 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); | |
934 | } | |
935 | ||
936 | static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr) | |
937 | { | |
938 | struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr; | |
939 | ||
940 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
941 | conn->tmfrsp_pdus_cnt++; | |
942 | ||
943 | if (conn->tmf_state != TMF_QUEUED) | |
944 | return; | |
945 | ||
946 | if (tmf->response == ISCSI_TMF_RSP_COMPLETE) | |
947 | conn->tmf_state = TMF_SUCCESS; | |
948 | else if (tmf->response == ISCSI_TMF_RSP_NO_TASK) | |
949 | conn->tmf_state = TMF_NOT_FOUND; | |
950 | else | |
951 | conn->tmf_state = TMF_FAILED; | |
952 | wake_up(&conn->ehwait); | |
953 | } | |
954 | ||
955 | static void iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr) | |
956 | { | |
957 | struct iscsi_nopout hdr; | |
958 | struct iscsi_task *task; | |
959 | ||
960 | if (!rhdr && conn->ping_task) | |
961 | return; | |
962 | ||
963 | memset(&hdr, 0, sizeof(struct iscsi_nopout)); | |
964 | hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE; | |
965 | hdr.flags = ISCSI_FLAG_CMD_FINAL; | |
966 | ||
967 | if (rhdr) { | |
968 | memcpy(hdr.lun, rhdr->lun, 8); | |
969 | hdr.ttt = rhdr->ttt; | |
970 | hdr.itt = RESERVED_ITT; | |
971 | } else | |
972 | hdr.ttt = RESERVED_ITT; | |
973 | ||
974 | task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0); | |
975 | if (!task) | |
976 | iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n"); | |
977 | else if (!rhdr) { | |
978 | /* only track our nops */ | |
979 | conn->ping_task = task; | |
980 | conn->last_ping = jiffies; | |
981 | } | |
982 | } | |
983 | ||
984 | static int iscsi_nop_out_rsp(struct iscsi_task *task, | |
985 | struct iscsi_nopin *nop, char *data, int datalen) | |
986 | { | |
987 | struct iscsi_conn *conn = task->conn; | |
988 | int rc = 0; | |
989 | ||
990 | if (conn->ping_task != task) { | |
991 | /* | |
992 | * If this is not in response to one of our | |
993 | * nops then it must be from userspace. | |
994 | */ | |
995 | if (iscsi_recv_pdu(conn->cls_conn, (struct iscsi_hdr *)nop, | |
996 | data, datalen)) | |
997 | rc = ISCSI_ERR_CONN_FAILED; | |
998 | } else | |
999 | mod_timer(&conn->transport_timer, jiffies + conn->recv_timeout); | |
1000 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); | |
1001 | return rc; | |
1002 | } | |
1003 | ||
1004 | static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
1005 | char *data, int datalen) | |
1006 | { | |
1007 | struct iscsi_reject *reject = (struct iscsi_reject *)hdr; | |
1008 | struct iscsi_hdr rejected_pdu; | |
1009 | int opcode, rc = 0; | |
1010 | ||
1011 | conn->exp_statsn = be32_to_cpu(reject->statsn) + 1; | |
1012 | ||
1013 | if (ntoh24(reject->dlength) > datalen || | |
1014 | ntoh24(reject->dlength) < sizeof(struct iscsi_hdr)) { | |
1015 | iscsi_conn_printk(KERN_ERR, conn, "Cannot handle rejected " | |
1016 | "pdu. Invalid data length (pdu dlength " | |
1017 | "%u, datalen %d\n", ntoh24(reject->dlength), | |
1018 | datalen); | |
1019 | return ISCSI_ERR_PROTO; | |
1020 | } | |
1021 | memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr)); | |
1022 | opcode = rejected_pdu.opcode & ISCSI_OPCODE_MASK; | |
1023 | ||
1024 | switch (reject->reason) { | |
1025 | case ISCSI_REASON_DATA_DIGEST_ERROR: | |
1026 | iscsi_conn_printk(KERN_ERR, conn, | |
1027 | "pdu (op 0x%x itt 0x%x) rejected " | |
1028 | "due to DataDigest error.\n", | |
1029 | rejected_pdu.itt, opcode); | |
1030 | break; | |
1031 | case ISCSI_REASON_IMM_CMD_REJECT: | |
1032 | iscsi_conn_printk(KERN_ERR, conn, | |
1033 | "pdu (op 0x%x itt 0x%x) rejected. Too many " | |
1034 | "immediate commands.\n", | |
1035 | rejected_pdu.itt, opcode); | |
1036 | /* | |
1037 | * We only send one TMF at a time so if the target could not | |
1038 | * handle it, then it should get fixed (RFC mandates that | |
1039 | * a target can handle one immediate TMF per conn). | |
1040 | * | |
1041 | * For nops-outs, we could have sent more than one if | |
1042 | * the target is sending us lots of nop-ins | |
1043 | */ | |
1044 | if (opcode != ISCSI_OP_NOOP_OUT) | |
1045 | return 0; | |
1046 | ||
1047 | if (rejected_pdu.itt == cpu_to_be32(ISCSI_RESERVED_TAG)) | |
1048 | /* | |
1049 | * nop-out in response to target's nop-out rejected. | |
1050 | * Just resend. | |
1051 | */ | |
1052 | iscsi_send_nopout(conn, | |
1053 | (struct iscsi_nopin*)&rejected_pdu); | |
1054 | else { | |
1055 | struct iscsi_task *task; | |
1056 | /* | |
1057 | * Our nop as ping got dropped. We know the target | |
1058 | * and transport are ok so just clean up | |
1059 | */ | |
1060 | task = iscsi_itt_to_task(conn, rejected_pdu.itt); | |
1061 | if (!task) { | |
1062 | iscsi_conn_printk(KERN_ERR, conn, | |
1063 | "Invalid pdu reject. Could " | |
1064 | "not lookup rejected task.\n"); | |
1065 | rc = ISCSI_ERR_BAD_ITT; | |
1066 | } else | |
1067 | rc = iscsi_nop_out_rsp(task, | |
1068 | (struct iscsi_nopin*)&rejected_pdu, | |
1069 | NULL, 0); | |
1070 | } | |
1071 | break; | |
1072 | default: | |
1073 | iscsi_conn_printk(KERN_ERR, conn, | |
1074 | "pdu (op 0x%x itt 0x%x) rejected. Reason " | |
1075 | "code 0x%x\n", rejected_pdu.itt, | |
1076 | rejected_pdu.opcode, reject->reason); | |
1077 | break; | |
1078 | } | |
1079 | return rc; | |
1080 | } | |
1081 | ||
1082 | /** | |
1083 | * iscsi_itt_to_task - look up task by itt | |
1084 | * @conn: iscsi connection | |
1085 | * @itt: itt | |
1086 | * | |
1087 | * This should be used for mgmt tasks like login and nops, or if | |
1088 | * the LDD's itt space does not include the session age. | |
1089 | * | |
1090 | * The session lock must be held. | |
1091 | */ | |
1092 | struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *conn, itt_t itt) | |
1093 | { | |
1094 | struct iscsi_session *session = conn->session; | |
1095 | int i; | |
1096 | ||
1097 | if (itt == RESERVED_ITT) | |
1098 | return NULL; | |
1099 | ||
1100 | if (session->tt->parse_pdu_itt) | |
1101 | session->tt->parse_pdu_itt(conn, itt, &i, NULL); | |
1102 | else | |
1103 | i = get_itt(itt); | |
1104 | if (i >= session->cmds_max) | |
1105 | return NULL; | |
1106 | ||
1107 | return session->cmds[i]; | |
1108 | } | |
1109 | EXPORT_SYMBOL_GPL(iscsi_itt_to_task); | |
1110 | ||
1111 | /** | |
1112 | * __iscsi_complete_pdu - complete pdu | |
1113 | * @conn: iscsi conn | |
1114 | * @hdr: iscsi header | |
1115 | * @data: data buffer | |
1116 | * @datalen: len of data buffer | |
1117 | * | |
1118 | * Completes pdu processing by freeing any resources allocated at | |
1119 | * queuecommand or send generic. session lock must be held and verify | |
1120 | * itt must have been called. | |
1121 | */ | |
1122 | int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
1123 | char *data, int datalen) | |
1124 | { | |
1125 | struct iscsi_session *session = conn->session; | |
1126 | int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0; | |
1127 | struct iscsi_task *task; | |
1128 | uint32_t itt; | |
1129 | ||
1130 | conn->last_recv = jiffies; | |
1131 | rc = iscsi_verify_itt(conn, hdr->itt); | |
1132 | if (rc) | |
1133 | return rc; | |
1134 | ||
1135 | if (hdr->itt != RESERVED_ITT) | |
1136 | itt = get_itt(hdr->itt); | |
1137 | else | |
1138 | itt = ~0U; | |
1139 | ||
1140 | ISCSI_DBG_SESSION(session, "[op 0x%x cid %d itt 0x%x len %d]\n", | |
1141 | opcode, conn->id, itt, datalen); | |
1142 | ||
1143 | if (itt == ~0U) { | |
1144 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
1145 | ||
1146 | switch(opcode) { | |
1147 | case ISCSI_OP_NOOP_IN: | |
1148 | if (datalen) { | |
1149 | rc = ISCSI_ERR_PROTO; | |
1150 | break; | |
1151 | } | |
1152 | ||
1153 | if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG)) | |
1154 | break; | |
1155 | ||
1156 | iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr); | |
1157 | break; | |
1158 | case ISCSI_OP_REJECT: | |
1159 | rc = iscsi_handle_reject(conn, hdr, data, datalen); | |
1160 | break; | |
1161 | case ISCSI_OP_ASYNC_EVENT: | |
1162 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
1163 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) | |
1164 | rc = ISCSI_ERR_CONN_FAILED; | |
1165 | break; | |
1166 | default: | |
1167 | rc = ISCSI_ERR_BAD_OPCODE; | |
1168 | break; | |
1169 | } | |
1170 | goto out; | |
1171 | } | |
1172 | ||
1173 | switch(opcode) { | |
1174 | case ISCSI_OP_SCSI_CMD_RSP: | |
1175 | case ISCSI_OP_SCSI_DATA_IN: | |
1176 | task = iscsi_itt_to_ctask(conn, hdr->itt); | |
1177 | if (!task) | |
1178 | return ISCSI_ERR_BAD_ITT; | |
1179 | task->last_xfer = jiffies; | |
1180 | break; | |
1181 | case ISCSI_OP_R2T: | |
1182 | /* | |
1183 | * LLD handles R2Ts if they need to. | |
1184 | */ | |
1185 | return 0; | |
1186 | case ISCSI_OP_LOGOUT_RSP: | |
1187 | case ISCSI_OP_LOGIN_RSP: | |
1188 | case ISCSI_OP_TEXT_RSP: | |
1189 | case ISCSI_OP_SCSI_TMFUNC_RSP: | |
1190 | case ISCSI_OP_NOOP_IN: | |
1191 | task = iscsi_itt_to_task(conn, hdr->itt); | |
1192 | if (!task) | |
1193 | return ISCSI_ERR_BAD_ITT; | |
1194 | break; | |
1195 | default: | |
1196 | return ISCSI_ERR_BAD_OPCODE; | |
1197 | } | |
1198 | ||
1199 | switch(opcode) { | |
1200 | case ISCSI_OP_SCSI_CMD_RSP: | |
1201 | iscsi_scsi_cmd_rsp(conn, hdr, task, data, datalen); | |
1202 | break; | |
1203 | case ISCSI_OP_SCSI_DATA_IN: | |
1204 | iscsi_data_in_rsp(conn, hdr, task); | |
1205 | break; | |
1206 | case ISCSI_OP_LOGOUT_RSP: | |
1207 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
1208 | if (datalen) { | |
1209 | rc = ISCSI_ERR_PROTO; | |
1210 | break; | |
1211 | } | |
1212 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
1213 | goto recv_pdu; | |
1214 | case ISCSI_OP_LOGIN_RSP: | |
1215 | case ISCSI_OP_TEXT_RSP: | |
1216 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
1217 | /* | |
1218 | * login related PDU's exp_statsn is handled in | |
1219 | * userspace | |
1220 | */ | |
1221 | goto recv_pdu; | |
1222 | case ISCSI_OP_SCSI_TMFUNC_RSP: | |
1223 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
1224 | if (datalen) { | |
1225 | rc = ISCSI_ERR_PROTO; | |
1226 | break; | |
1227 | } | |
1228 | ||
1229 | iscsi_tmf_rsp(conn, hdr); | |
1230 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); | |
1231 | break; | |
1232 | case ISCSI_OP_NOOP_IN: | |
1233 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
1234 | if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) { | |
1235 | rc = ISCSI_ERR_PROTO; | |
1236 | break; | |
1237 | } | |
1238 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
1239 | ||
1240 | rc = iscsi_nop_out_rsp(task, (struct iscsi_nopin*)hdr, | |
1241 | data, datalen); | |
1242 | break; | |
1243 | default: | |
1244 | rc = ISCSI_ERR_BAD_OPCODE; | |
1245 | break; | |
1246 | } | |
1247 | ||
1248 | out: | |
1249 | return rc; | |
1250 | recv_pdu: | |
1251 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) | |
1252 | rc = ISCSI_ERR_CONN_FAILED; | |
1253 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); | |
1254 | return rc; | |
1255 | } | |
1256 | EXPORT_SYMBOL_GPL(__iscsi_complete_pdu); | |
1257 | ||
1258 | int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
1259 | char *data, int datalen) | |
1260 | { | |
1261 | int rc; | |
1262 | ||
1263 | spin_lock(&conn->session->lock); | |
1264 | rc = __iscsi_complete_pdu(conn, hdr, data, datalen); | |
1265 | spin_unlock(&conn->session->lock); | |
1266 | return rc; | |
1267 | } | |
1268 | EXPORT_SYMBOL_GPL(iscsi_complete_pdu); | |
1269 | ||
1270 | int iscsi_verify_itt(struct iscsi_conn *conn, itt_t itt) | |
1271 | { | |
1272 | struct iscsi_session *session = conn->session; | |
1273 | int age = 0, i = 0; | |
1274 | ||
1275 | if (itt == RESERVED_ITT) | |
1276 | return 0; | |
1277 | ||
1278 | if (session->tt->parse_pdu_itt) | |
1279 | session->tt->parse_pdu_itt(conn, itt, &i, &age); | |
1280 | else { | |
1281 | i = get_itt(itt); | |
1282 | age = ((__force u32)itt >> ISCSI_AGE_SHIFT) & ISCSI_AGE_MASK; | |
1283 | } | |
1284 | ||
1285 | if (age != session->age) { | |
1286 | iscsi_conn_printk(KERN_ERR, conn, | |
1287 | "received itt %x expected session age (%x)\n", | |
1288 | (__force u32)itt, session->age); | |
1289 | return ISCSI_ERR_BAD_ITT; | |
1290 | } | |
1291 | ||
1292 | if (i >= session->cmds_max) { | |
1293 | iscsi_conn_printk(KERN_ERR, conn, | |
1294 | "received invalid itt index %u (max cmds " | |
1295 | "%u.\n", i, session->cmds_max); | |
1296 | return ISCSI_ERR_BAD_ITT; | |
1297 | } | |
1298 | return 0; | |
1299 | } | |
1300 | EXPORT_SYMBOL_GPL(iscsi_verify_itt); | |
1301 | ||
1302 | /** | |
1303 | * iscsi_itt_to_ctask - look up ctask by itt | |
1304 | * @conn: iscsi connection | |
1305 | * @itt: itt | |
1306 | * | |
1307 | * This should be used for cmd tasks. | |
1308 | * | |
1309 | * The session lock must be held. | |
1310 | */ | |
1311 | struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *conn, itt_t itt) | |
1312 | { | |
1313 | struct iscsi_task *task; | |
1314 | ||
1315 | if (iscsi_verify_itt(conn, itt)) | |
1316 | return NULL; | |
1317 | ||
1318 | task = iscsi_itt_to_task(conn, itt); | |
1319 | if (!task || !task->sc) | |
1320 | return NULL; | |
1321 | ||
1322 | if (task->sc->SCp.phase != conn->session->age) { | |
1323 | iscsi_session_printk(KERN_ERR, conn->session, | |
1324 | "task's session age %d, expected %d\n", | |
1325 | task->sc->SCp.phase, conn->session->age); | |
1326 | return NULL; | |
1327 | } | |
1328 | ||
1329 | return task; | |
1330 | } | |
1331 | EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask); | |
1332 | ||
1333 | void iscsi_session_failure(struct iscsi_session *session, | |
1334 | enum iscsi_err err) | |
1335 | { | |
1336 | struct iscsi_conn *conn; | |
1337 | struct device *dev; | |
1338 | unsigned long flags; | |
1339 | ||
1340 | spin_lock_irqsave(&session->lock, flags); | |
1341 | conn = session->leadconn; | |
1342 | if (session->state == ISCSI_STATE_TERMINATE || !conn) { | |
1343 | spin_unlock_irqrestore(&session->lock, flags); | |
1344 | return; | |
1345 | } | |
1346 | ||
1347 | dev = get_device(&conn->cls_conn->dev); | |
1348 | spin_unlock_irqrestore(&session->lock, flags); | |
1349 | if (!dev) | |
1350 | return; | |
1351 | /* | |
1352 | * if the host is being removed bypass the connection | |
1353 | * recovery initialization because we are going to kill | |
1354 | * the session. | |
1355 | */ | |
1356 | if (err == ISCSI_ERR_INVALID_HOST) | |
1357 | iscsi_conn_error_event(conn->cls_conn, err); | |
1358 | else | |
1359 | iscsi_conn_failure(conn, err); | |
1360 | put_device(dev); | |
1361 | } | |
1362 | EXPORT_SYMBOL_GPL(iscsi_session_failure); | |
1363 | ||
1364 | void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err) | |
1365 | { | |
1366 | struct iscsi_session *session = conn->session; | |
1367 | unsigned long flags; | |
1368 | ||
1369 | spin_lock_irqsave(&session->lock, flags); | |
1370 | if (session->state == ISCSI_STATE_FAILED) { | |
1371 | spin_unlock_irqrestore(&session->lock, flags); | |
1372 | return; | |
1373 | } | |
1374 | ||
1375 | if (conn->stop_stage == 0) | |
1376 | session->state = ISCSI_STATE_FAILED; | |
1377 | spin_unlock_irqrestore(&session->lock, flags); | |
1378 | ||
1379 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
1380 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
1381 | iscsi_conn_error_event(conn->cls_conn, err); | |
1382 | } | |
1383 | EXPORT_SYMBOL_GPL(iscsi_conn_failure); | |
1384 | ||
1385 | static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn) | |
1386 | { | |
1387 | struct iscsi_session *session = conn->session; | |
1388 | ||
1389 | /* | |
1390 | * Check for iSCSI window and take care of CmdSN wrap-around | |
1391 | */ | |
1392 | if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) { | |
1393 | ISCSI_DBG_SESSION(session, "iSCSI CmdSN closed. ExpCmdSn " | |
1394 | "%u MaxCmdSN %u CmdSN %u/%u\n", | |
1395 | session->exp_cmdsn, session->max_cmdsn, | |
1396 | session->cmdsn, session->queued_cmdsn); | |
1397 | return -ENOSPC; | |
1398 | } | |
1399 | return 0; | |
1400 | } | |
1401 | ||
1402 | static int iscsi_xmit_task(struct iscsi_conn *conn) | |
1403 | { | |
1404 | struct iscsi_task *task = conn->task; | |
1405 | int rc; | |
1406 | ||
1407 | if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) | |
1408 | return -ENODATA; | |
1409 | ||
1410 | __iscsi_get_task(task); | |
1411 | spin_unlock_bh(&conn->session->lock); | |
1412 | rc = conn->session->tt->xmit_task(task); | |
1413 | spin_lock_bh(&conn->session->lock); | |
1414 | if (!rc) { | |
1415 | /* done with this task */ | |
1416 | task->last_xfer = jiffies; | |
1417 | conn->task = NULL; | |
1418 | } | |
1419 | __iscsi_put_task(task); | |
1420 | return rc; | |
1421 | } | |
1422 | ||
1423 | /** | |
1424 | * iscsi_requeue_task - requeue task to run from session workqueue | |
1425 | * @task: task to requeue | |
1426 | * | |
1427 | * LLDs that need to run a task from the session workqueue should call | |
1428 | * this. The session lock must be held. This should only be called | |
1429 | * by software drivers. | |
1430 | */ | |
1431 | void iscsi_requeue_task(struct iscsi_task *task) | |
1432 | { | |
1433 | struct iscsi_conn *conn = task->conn; | |
1434 | ||
1435 | /* | |
1436 | * this may be on the requeue list already if the xmit_task callout | |
1437 | * is handling the r2ts while we are adding new ones | |
1438 | */ | |
1439 | if (list_empty(&task->running)) | |
1440 | list_add_tail(&task->running, &conn->requeue); | |
1441 | iscsi_conn_queue_work(conn); | |
1442 | } | |
1443 | EXPORT_SYMBOL_GPL(iscsi_requeue_task); | |
1444 | ||
1445 | /** | |
1446 | * iscsi_data_xmit - xmit any command into the scheduled connection | |
1447 | * @conn: iscsi connection | |
1448 | * | |
1449 | * Notes: | |
1450 | * The function can return -EAGAIN in which case the caller must | |
1451 | * re-schedule it again later or recover. '0' return code means | |
1452 | * successful xmit. | |
1453 | **/ | |
1454 | static int iscsi_data_xmit(struct iscsi_conn *conn) | |
1455 | { | |
1456 | struct iscsi_task *task; | |
1457 | int rc = 0; | |
1458 | ||
1459 | spin_lock_bh(&conn->session->lock); | |
1460 | if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) { | |
1461 | ISCSI_DBG_SESSION(conn->session, "Tx suspended!\n"); | |
1462 | spin_unlock_bh(&conn->session->lock); | |
1463 | return -ENODATA; | |
1464 | } | |
1465 | ||
1466 | if (conn->task) { | |
1467 | rc = iscsi_xmit_task(conn); | |
1468 | if (rc) | |
1469 | goto done; | |
1470 | } | |
1471 | ||
1472 | /* | |
1473 | * process mgmt pdus like nops before commands since we should | |
1474 | * only have one nop-out as a ping from us and targets should not | |
1475 | * overflow us with nop-ins | |
1476 | */ | |
1477 | check_mgmt: | |
1478 | while (!list_empty(&conn->mgmtqueue)) { | |
1479 | conn->task = list_entry(conn->mgmtqueue.next, | |
1480 | struct iscsi_task, running); | |
1481 | list_del_init(&conn->task->running); | |
1482 | if (iscsi_prep_mgmt_task(conn, conn->task)) { | |
1483 | __iscsi_put_task(conn->task); | |
1484 | conn->task = NULL; | |
1485 | continue; | |
1486 | } | |
1487 | rc = iscsi_xmit_task(conn); | |
1488 | if (rc) | |
1489 | goto done; | |
1490 | } | |
1491 | ||
1492 | /* process pending command queue */ | |
1493 | while (!list_empty(&conn->cmdqueue)) { | |
1494 | conn->task = list_entry(conn->cmdqueue.next, struct iscsi_task, | |
1495 | running); | |
1496 | list_del_init(&conn->task->running); | |
1497 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) { | |
1498 | fail_scsi_task(conn->task, DID_IMM_RETRY); | |
1499 | continue; | |
1500 | } | |
1501 | rc = iscsi_prep_scsi_cmd_pdu(conn->task); | |
1502 | if (rc) { | |
1503 | if (rc == -ENOMEM || rc == -EACCES) { | |
1504 | list_add_tail(&conn->task->running, | |
1505 | &conn->cmdqueue); | |
1506 | conn->task = NULL; | |
1507 | goto done; | |
1508 | } else | |
1509 | fail_scsi_task(conn->task, DID_ABORT); | |
1510 | continue; | |
1511 | } | |
1512 | rc = iscsi_xmit_task(conn); | |
1513 | if (rc) | |
1514 | goto done; | |
1515 | /* | |
1516 | * we could continuously get new task requests so | |
1517 | * we need to check the mgmt queue for nops that need to | |
1518 | * be sent to aviod starvation | |
1519 | */ | |
1520 | if (!list_empty(&conn->mgmtqueue)) | |
1521 | goto check_mgmt; | |
1522 | } | |
1523 | ||
1524 | while (!list_empty(&conn->requeue)) { | |
1525 | /* | |
1526 | * we always do fastlogout - conn stop code will clean up. | |
1527 | */ | |
1528 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) | |
1529 | break; | |
1530 | ||
1531 | task = list_entry(conn->requeue.next, struct iscsi_task, | |
1532 | running); | |
1533 | if (iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_DATA_OUT)) | |
1534 | break; | |
1535 | ||
1536 | conn->task = task; | |
1537 | list_del_init(&conn->task->running); | |
1538 | conn->task->state = ISCSI_TASK_RUNNING; | |
1539 | rc = iscsi_xmit_task(conn); | |
1540 | if (rc) | |
1541 | goto done; | |
1542 | if (!list_empty(&conn->mgmtqueue)) | |
1543 | goto check_mgmt; | |
1544 | } | |
1545 | spin_unlock_bh(&conn->session->lock); | |
1546 | return -ENODATA; | |
1547 | ||
1548 | done: | |
1549 | spin_unlock_bh(&conn->session->lock); | |
1550 | return rc; | |
1551 | } | |
1552 | ||
1553 | static void iscsi_xmitworker(struct work_struct *work) | |
1554 | { | |
1555 | struct iscsi_conn *conn = | |
1556 | container_of(work, struct iscsi_conn, xmitwork); | |
1557 | int rc; | |
1558 | /* | |
1559 | * serialize Xmit worker on a per-connection basis. | |
1560 | */ | |
1561 | do { | |
1562 | rc = iscsi_data_xmit(conn); | |
1563 | } while (rc >= 0 || rc == -EAGAIN); | |
1564 | } | |
1565 | ||
1566 | static inline struct iscsi_task *iscsi_alloc_task(struct iscsi_conn *conn, | |
1567 | struct scsi_cmnd *sc) | |
1568 | { | |
1569 | struct iscsi_task *task; | |
1570 | ||
1571 | if (!kfifo_out(&conn->session->cmdpool.queue, | |
1572 | (void *) &task, sizeof(void *))) | |
1573 | return NULL; | |
1574 | ||
1575 | sc->SCp.phase = conn->session->age; | |
1576 | sc->SCp.ptr = (char *) task; | |
1577 | ||
1578 | atomic_set(&task->refcount, 1); | |
1579 | task->state = ISCSI_TASK_PENDING; | |
1580 | task->conn = conn; | |
1581 | task->sc = sc; | |
1582 | task->have_checked_conn = false; | |
1583 | task->last_timeout = jiffies; | |
1584 | task->last_xfer = jiffies; | |
1585 | INIT_LIST_HEAD(&task->running); | |
1586 | return task; | |
1587 | } | |
1588 | ||
1589 | enum { | |
1590 | FAILURE_BAD_HOST = 1, | |
1591 | FAILURE_SESSION_FAILED, | |
1592 | FAILURE_SESSION_FREED, | |
1593 | FAILURE_WINDOW_CLOSED, | |
1594 | FAILURE_OOM, | |
1595 | FAILURE_SESSION_TERMINATE, | |
1596 | FAILURE_SESSION_IN_RECOVERY, | |
1597 | FAILURE_SESSION_RECOVERY_TIMEOUT, | |
1598 | FAILURE_SESSION_LOGGING_OUT, | |
1599 | FAILURE_SESSION_NOT_READY, | |
1600 | }; | |
1601 | ||
1602 | static int iscsi_queuecommand_lck(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *)) | |
1603 | { | |
1604 | struct iscsi_cls_session *cls_session; | |
1605 | struct Scsi_Host *host; | |
1606 | struct iscsi_host *ihost; | |
1607 | int reason = 0; | |
1608 | struct iscsi_session *session; | |
1609 | struct iscsi_conn *conn; | |
1610 | struct iscsi_task *task = NULL; | |
1611 | ||
1612 | sc->scsi_done = done; | |
1613 | sc->result = 0; | |
1614 | sc->SCp.ptr = NULL; | |
1615 | ||
1616 | host = sc->device->host; | |
1617 | ihost = shost_priv(host); | |
1618 | spin_unlock(host->host_lock); | |
1619 | ||
1620 | cls_session = starget_to_session(scsi_target(sc->device)); | |
1621 | session = cls_session->dd_data; | |
1622 | spin_lock(&session->lock); | |
1623 | ||
1624 | reason = iscsi_session_chkready(cls_session); | |
1625 | if (reason) { | |
1626 | sc->result = reason; | |
1627 | goto fault; | |
1628 | } | |
1629 | ||
1630 | if (session->state != ISCSI_STATE_LOGGED_IN) { | |
1631 | /* | |
1632 | * to handle the race between when we set the recovery state | |
1633 | * and block the session we requeue here (commands could | |
1634 | * be entering our queuecommand while a block is starting | |
1635 | * up because the block code is not locked) | |
1636 | */ | |
1637 | switch (session->state) { | |
1638 | case ISCSI_STATE_FAILED: | |
1639 | case ISCSI_STATE_IN_RECOVERY: | |
1640 | reason = FAILURE_SESSION_IN_RECOVERY; | |
1641 | sc->result = DID_IMM_RETRY << 16; | |
1642 | break; | |
1643 | case ISCSI_STATE_LOGGING_OUT: | |
1644 | reason = FAILURE_SESSION_LOGGING_OUT; | |
1645 | sc->result = DID_IMM_RETRY << 16; | |
1646 | break; | |
1647 | case ISCSI_STATE_RECOVERY_FAILED: | |
1648 | reason = FAILURE_SESSION_RECOVERY_TIMEOUT; | |
1649 | sc->result = DID_TRANSPORT_FAILFAST << 16; | |
1650 | break; | |
1651 | case ISCSI_STATE_TERMINATE: | |
1652 | reason = FAILURE_SESSION_TERMINATE; | |
1653 | sc->result = DID_NO_CONNECT << 16; | |
1654 | break; | |
1655 | default: | |
1656 | reason = FAILURE_SESSION_FREED; | |
1657 | sc->result = DID_NO_CONNECT << 16; | |
1658 | } | |
1659 | goto fault; | |
1660 | } | |
1661 | ||
1662 | conn = session->leadconn; | |
1663 | if (!conn) { | |
1664 | reason = FAILURE_SESSION_FREED; | |
1665 | sc->result = DID_NO_CONNECT << 16; | |
1666 | goto fault; | |
1667 | } | |
1668 | ||
1669 | if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) { | |
1670 | reason = FAILURE_SESSION_IN_RECOVERY; | |
1671 | sc->result = DID_REQUEUE; | |
1672 | goto fault; | |
1673 | } | |
1674 | ||
1675 | if (iscsi_check_cmdsn_window_closed(conn)) { | |
1676 | reason = FAILURE_WINDOW_CLOSED; | |
1677 | goto reject; | |
1678 | } | |
1679 | ||
1680 | task = iscsi_alloc_task(conn, sc); | |
1681 | if (!task) { | |
1682 | reason = FAILURE_OOM; | |
1683 | goto reject; | |
1684 | } | |
1685 | ||
1686 | if (!ihost->workq) { | |
1687 | reason = iscsi_prep_scsi_cmd_pdu(task); | |
1688 | if (reason) { | |
1689 | if (reason == -ENOMEM || reason == -EACCES) { | |
1690 | reason = FAILURE_OOM; | |
1691 | goto prepd_reject; | |
1692 | } else { | |
1693 | sc->result = DID_ABORT << 16; | |
1694 | goto prepd_fault; | |
1695 | } | |
1696 | } | |
1697 | if (session->tt->xmit_task(task)) { | |
1698 | session->cmdsn--; | |
1699 | reason = FAILURE_SESSION_NOT_READY; | |
1700 | goto prepd_reject; | |
1701 | } | |
1702 | } else { | |
1703 | list_add_tail(&task->running, &conn->cmdqueue); | |
1704 | iscsi_conn_queue_work(conn); | |
1705 | } | |
1706 | ||
1707 | session->queued_cmdsn++; | |
1708 | spin_unlock(&session->lock); | |
1709 | spin_lock(host->host_lock); | |
1710 | return 0; | |
1711 | ||
1712 | prepd_reject: | |
1713 | sc->scsi_done = NULL; | |
1714 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); | |
1715 | reject: | |
1716 | spin_unlock(&session->lock); | |
1717 | ISCSI_DBG_SESSION(session, "cmd 0x%x rejected (%d)\n", | |
1718 | sc->cmnd[0], reason); | |
1719 | spin_lock(host->host_lock); | |
1720 | return SCSI_MLQUEUE_TARGET_BUSY; | |
1721 | ||
1722 | prepd_fault: | |
1723 | sc->scsi_done = NULL; | |
1724 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); | |
1725 | fault: | |
1726 | spin_unlock(&session->lock); | |
1727 | ISCSI_DBG_SESSION(session, "iscsi: cmd 0x%x is not queued (%d)\n", | |
1728 | sc->cmnd[0], reason); | |
1729 | if (!scsi_bidi_cmnd(sc)) | |
1730 | scsi_set_resid(sc, scsi_bufflen(sc)); | |
1731 | else { | |
1732 | scsi_out(sc)->resid = scsi_out(sc)->length; | |
1733 | scsi_in(sc)->resid = scsi_in(sc)->length; | |
1734 | } | |
1735 | done(sc); | |
1736 | spin_lock(host->host_lock); | |
1737 | return 0; | |
1738 | } | |
1739 | ||
1740 | DEF_SCSI_QCMD(iscsi_queuecommand) | |
1741 | EXPORT_SYMBOL_GPL(iscsi_queuecommand); | |
1742 | ||
1743 | int iscsi_change_queue_depth(struct scsi_device *sdev, int depth, int reason) | |
1744 | { | |
1745 | switch (reason) { | |
1746 | case SCSI_QDEPTH_DEFAULT: | |
1747 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); | |
1748 | break; | |
1749 | case SCSI_QDEPTH_QFULL: | |
1750 | scsi_track_queue_full(sdev, depth); | |
1751 | break; | |
1752 | case SCSI_QDEPTH_RAMP_UP: | |
1753 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); | |
1754 | break; | |
1755 | default: | |
1756 | return -EOPNOTSUPP; | |
1757 | } | |
1758 | return sdev->queue_depth; | |
1759 | } | |
1760 | EXPORT_SYMBOL_GPL(iscsi_change_queue_depth); | |
1761 | ||
1762 | int iscsi_target_alloc(struct scsi_target *starget) | |
1763 | { | |
1764 | struct iscsi_cls_session *cls_session = starget_to_session(starget); | |
1765 | struct iscsi_session *session = cls_session->dd_data; | |
1766 | ||
1767 | starget->can_queue = session->scsi_cmds_max; | |
1768 | return 0; | |
1769 | } | |
1770 | EXPORT_SYMBOL_GPL(iscsi_target_alloc); | |
1771 | ||
1772 | static void iscsi_tmf_timedout(unsigned long data) | |
1773 | { | |
1774 | struct iscsi_conn *conn = (struct iscsi_conn *)data; | |
1775 | struct iscsi_session *session = conn->session; | |
1776 | ||
1777 | spin_lock(&session->lock); | |
1778 | if (conn->tmf_state == TMF_QUEUED) { | |
1779 | conn->tmf_state = TMF_TIMEDOUT; | |
1780 | ISCSI_DBG_EH(session, "tmf timedout\n"); | |
1781 | /* unblock eh_abort() */ | |
1782 | wake_up(&conn->ehwait); | |
1783 | } | |
1784 | spin_unlock(&session->lock); | |
1785 | } | |
1786 | ||
1787 | static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn, | |
1788 | struct iscsi_tm *hdr, int age, | |
1789 | int timeout) | |
1790 | { | |
1791 | struct iscsi_session *session = conn->session; | |
1792 | struct iscsi_task *task; | |
1793 | ||
1794 | task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr, | |
1795 | NULL, 0); | |
1796 | if (!task) { | |
1797 | spin_unlock_bh(&session->lock); | |
1798 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1799 | spin_lock_bh(&session->lock); | |
1800 | ISCSI_DBG_EH(session, "tmf exec failure\n"); | |
1801 | return -EPERM; | |
1802 | } | |
1803 | conn->tmfcmd_pdus_cnt++; | |
1804 | conn->tmf_timer.expires = timeout * HZ + jiffies; | |
1805 | conn->tmf_timer.function = iscsi_tmf_timedout; | |
1806 | conn->tmf_timer.data = (unsigned long)conn; | |
1807 | add_timer(&conn->tmf_timer); | |
1808 | ISCSI_DBG_EH(session, "tmf set timeout\n"); | |
1809 | ||
1810 | spin_unlock_bh(&session->lock); | |
1811 | mutex_unlock(&session->eh_mutex); | |
1812 | ||
1813 | /* | |
1814 | * block eh thread until: | |
1815 | * | |
1816 | * 1) tmf response | |
1817 | * 2) tmf timeout | |
1818 | * 3) session is terminated or restarted or userspace has | |
1819 | * given up on recovery | |
1820 | */ | |
1821 | wait_event_interruptible(conn->ehwait, age != session->age || | |
1822 | session->state != ISCSI_STATE_LOGGED_IN || | |
1823 | conn->tmf_state != TMF_QUEUED); | |
1824 | if (signal_pending(current)) | |
1825 | flush_signals(current); | |
1826 | del_timer_sync(&conn->tmf_timer); | |
1827 | ||
1828 | mutex_lock(&session->eh_mutex); | |
1829 | spin_lock_bh(&session->lock); | |
1830 | /* if the session drops it will clean up the task */ | |
1831 | if (age != session->age || | |
1832 | session->state != ISCSI_STATE_LOGGED_IN) | |
1833 | return -ENOTCONN; | |
1834 | return 0; | |
1835 | } | |
1836 | ||
1837 | /* | |
1838 | * Fail commands. session lock held and recv side suspended and xmit | |
1839 | * thread flushed | |
1840 | */ | |
1841 | static void fail_scsi_tasks(struct iscsi_conn *conn, unsigned lun, | |
1842 | int error) | |
1843 | { | |
1844 | struct iscsi_task *task; | |
1845 | int i; | |
1846 | ||
1847 | for (i = 0; i < conn->session->cmds_max; i++) { | |
1848 | task = conn->session->cmds[i]; | |
1849 | if (!task->sc || task->state == ISCSI_TASK_FREE) | |
1850 | continue; | |
1851 | ||
1852 | if (lun != -1 && lun != task->sc->device->lun) | |
1853 | continue; | |
1854 | ||
1855 | ISCSI_DBG_SESSION(conn->session, | |
1856 | "failing sc %p itt 0x%x state %d\n", | |
1857 | task->sc, task->itt, task->state); | |
1858 | fail_scsi_task(task, error); | |
1859 | } | |
1860 | } | |
1861 | ||
1862 | /** | |
1863 | * iscsi_suspend_queue - suspend iscsi_queuecommand | |
1864 | * @conn: iscsi conn to stop queueing IO on | |
1865 | * | |
1866 | * This grabs the session lock to make sure no one is in | |
1867 | * xmit_task/queuecommand, and then sets suspend to prevent | |
1868 | * new commands from being queued. This only needs to be called | |
1869 | * by offload drivers that need to sync a path like ep disconnect | |
1870 | * with the iscsi_queuecommand/xmit_task. To start IO again libiscsi | |
1871 | * will call iscsi_start_tx and iscsi_unblock_session when in FFP. | |
1872 | */ | |
1873 | void iscsi_suspend_queue(struct iscsi_conn *conn) | |
1874 | { | |
1875 | spin_lock_bh(&conn->session->lock); | |
1876 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
1877 | spin_unlock_bh(&conn->session->lock); | |
1878 | } | |
1879 | EXPORT_SYMBOL_GPL(iscsi_suspend_queue); | |
1880 | ||
1881 | /** | |
1882 | * iscsi_suspend_tx - suspend iscsi_data_xmit | |
1883 | * @conn: iscsi conn tp stop processing IO on. | |
1884 | * | |
1885 | * This function sets the suspend bit to prevent iscsi_data_xmit | |
1886 | * from sending new IO, and if work is queued on the xmit thread | |
1887 | * it will wait for it to be completed. | |
1888 | */ | |
1889 | void iscsi_suspend_tx(struct iscsi_conn *conn) | |
1890 | { | |
1891 | struct Scsi_Host *shost = conn->session->host; | |
1892 | struct iscsi_host *ihost = shost_priv(shost); | |
1893 | ||
1894 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
1895 | if (ihost->workq) | |
1896 | flush_workqueue(ihost->workq); | |
1897 | } | |
1898 | EXPORT_SYMBOL_GPL(iscsi_suspend_tx); | |
1899 | ||
1900 | static void iscsi_start_tx(struct iscsi_conn *conn) | |
1901 | { | |
1902 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
1903 | iscsi_conn_queue_work(conn); | |
1904 | } | |
1905 | ||
1906 | /* | |
1907 | * We want to make sure a ping is in flight. It has timed out. | |
1908 | * And we are not busy processing a pdu that is making | |
1909 | * progress but got started before the ping and is taking a while | |
1910 | * to complete so the ping is just stuck behind it in a queue. | |
1911 | */ | |
1912 | static int iscsi_has_ping_timed_out(struct iscsi_conn *conn) | |
1913 | { | |
1914 | if (conn->ping_task && | |
1915 | time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) + | |
1916 | (conn->ping_timeout * HZ), jiffies)) | |
1917 | return 1; | |
1918 | else | |
1919 | return 0; | |
1920 | } | |
1921 | ||
1922 | static enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *sc) | |
1923 | { | |
1924 | enum blk_eh_timer_return rc = BLK_EH_NOT_HANDLED; | |
1925 | struct iscsi_task *task = NULL, *running_task; | |
1926 | struct iscsi_cls_session *cls_session; | |
1927 | struct iscsi_session *session; | |
1928 | struct iscsi_conn *conn; | |
1929 | int i; | |
1930 | ||
1931 | cls_session = starget_to_session(scsi_target(sc->device)); | |
1932 | session = cls_session->dd_data; | |
1933 | ||
1934 | ISCSI_DBG_EH(session, "scsi cmd %p timedout\n", sc); | |
1935 | ||
1936 | spin_lock(&session->lock); | |
1937 | if (session->state != ISCSI_STATE_LOGGED_IN) { | |
1938 | /* | |
1939 | * We are probably in the middle of iscsi recovery so let | |
1940 | * that complete and handle the error. | |
1941 | */ | |
1942 | rc = BLK_EH_RESET_TIMER; | |
1943 | goto done; | |
1944 | } | |
1945 | ||
1946 | conn = session->leadconn; | |
1947 | if (!conn) { | |
1948 | /* In the middle of shuting down */ | |
1949 | rc = BLK_EH_RESET_TIMER; | |
1950 | goto done; | |
1951 | } | |
1952 | ||
1953 | task = (struct iscsi_task *)sc->SCp.ptr; | |
1954 | if (!task) { | |
1955 | /* | |
1956 | * Raced with completion. Just reset timer, and let it | |
1957 | * complete normally | |
1958 | */ | |
1959 | rc = BLK_EH_RESET_TIMER; | |
1960 | goto done; | |
1961 | } | |
1962 | ||
1963 | /* | |
1964 | * If we have sent (at least queued to the network layer) a pdu or | |
1965 | * recvd one for the task since the last timeout ask for | |
1966 | * more time. If on the next timeout we have not made progress | |
1967 | * we can check if it is the task or connection when we send the | |
1968 | * nop as a ping. | |
1969 | */ | |
1970 | if (time_after(task->last_xfer, task->last_timeout)) { | |
1971 | ISCSI_DBG_EH(session, "Command making progress. Asking " | |
1972 | "scsi-ml for more time to complete. " | |
1973 | "Last data xfer at %lu. Last timeout was at " | |
1974 | "%lu\n.", task->last_xfer, task->last_timeout); | |
1975 | task->have_checked_conn = false; | |
1976 | rc = BLK_EH_RESET_TIMER; | |
1977 | goto done; | |
1978 | } | |
1979 | ||
1980 | if (!conn->recv_timeout && !conn->ping_timeout) | |
1981 | goto done; | |
1982 | /* | |
1983 | * if the ping timedout then we are in the middle of cleaning up | |
1984 | * and can let the iscsi eh handle it | |
1985 | */ | |
1986 | if (iscsi_has_ping_timed_out(conn)) { | |
1987 | rc = BLK_EH_RESET_TIMER; | |
1988 | goto done; | |
1989 | } | |
1990 | ||
1991 | for (i = 0; i < conn->session->cmds_max; i++) { | |
1992 | running_task = conn->session->cmds[i]; | |
1993 | if (!running_task->sc || running_task == task || | |
1994 | running_task->state != ISCSI_TASK_RUNNING) | |
1995 | continue; | |
1996 | ||
1997 | /* | |
1998 | * Only check if cmds started before this one have made | |
1999 | * progress, or this could never fail | |
2000 | */ | |
2001 | if (time_after(running_task->sc->jiffies_at_alloc, | |
2002 | task->sc->jiffies_at_alloc)) | |
2003 | continue; | |
2004 | ||
2005 | if (time_after(running_task->last_xfer, task->last_timeout)) { | |
2006 | /* | |
2007 | * This task has not made progress, but a task | |
2008 | * started before us has transferred data since | |
2009 | * we started/last-checked. We could be queueing | |
2010 | * too many tasks or the LU is bad. | |
2011 | * | |
2012 | * If the device is bad the cmds ahead of us on | |
2013 | * other devs will complete, and this loop will | |
2014 | * eventually fail starting the scsi eh. | |
2015 | */ | |
2016 | ISCSI_DBG_EH(session, "Command has not made progress " | |
2017 | "but commands ahead of it have. " | |
2018 | "Asking scsi-ml for more time to " | |
2019 | "complete. Our last xfer vs running task " | |
2020 | "last xfer %lu/%lu. Last check %lu.\n", | |
2021 | task->last_xfer, running_task->last_xfer, | |
2022 | task->last_timeout); | |
2023 | rc = BLK_EH_RESET_TIMER; | |
2024 | goto done; | |
2025 | } | |
2026 | } | |
2027 | ||
2028 | /* Assumes nop timeout is shorter than scsi cmd timeout */ | |
2029 | if (task->have_checked_conn) | |
2030 | goto done; | |
2031 | ||
2032 | /* | |
2033 | * Checking the transport already or nop from a cmd timeout still | |
2034 | * running | |
2035 | */ | |
2036 | if (conn->ping_task) { | |
2037 | task->have_checked_conn = true; | |
2038 | rc = BLK_EH_RESET_TIMER; | |
2039 | goto done; | |
2040 | } | |
2041 | ||
2042 | /* Make sure there is a transport check done */ | |
2043 | iscsi_send_nopout(conn, NULL); | |
2044 | task->have_checked_conn = true; | |
2045 | rc = BLK_EH_RESET_TIMER; | |
2046 | ||
2047 | done: | |
2048 | if (task) | |
2049 | task->last_timeout = jiffies; | |
2050 | spin_unlock(&session->lock); | |
2051 | ISCSI_DBG_EH(session, "return %s\n", rc == BLK_EH_RESET_TIMER ? | |
2052 | "timer reset" : "nh"); | |
2053 | return rc; | |
2054 | } | |
2055 | ||
2056 | static void iscsi_check_transport_timeouts(unsigned long data) | |
2057 | { | |
2058 | struct iscsi_conn *conn = (struct iscsi_conn *)data; | |
2059 | struct iscsi_session *session = conn->session; | |
2060 | unsigned long recv_timeout, next_timeout = 0, last_recv; | |
2061 | ||
2062 | spin_lock(&session->lock); | |
2063 | if (session->state != ISCSI_STATE_LOGGED_IN) | |
2064 | goto done; | |
2065 | ||
2066 | recv_timeout = conn->recv_timeout; | |
2067 | if (!recv_timeout) | |
2068 | goto done; | |
2069 | ||
2070 | recv_timeout *= HZ; | |
2071 | last_recv = conn->last_recv; | |
2072 | ||
2073 | if (iscsi_has_ping_timed_out(conn)) { | |
2074 | iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs " | |
2075 | "expired, recv timeout %d, last rx %lu, " | |
2076 | "last ping %lu, now %lu\n", | |
2077 | conn->ping_timeout, conn->recv_timeout, | |
2078 | last_recv, conn->last_ping, jiffies); | |
2079 | spin_unlock(&session->lock); | |
2080 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
2081 | return; | |
2082 | } | |
2083 | ||
2084 | if (time_before_eq(last_recv + recv_timeout, jiffies)) { | |
2085 | /* send a ping to try to provoke some traffic */ | |
2086 | ISCSI_DBG_CONN(conn, "Sending nopout as ping\n"); | |
2087 | iscsi_send_nopout(conn, NULL); | |
2088 | next_timeout = conn->last_ping + (conn->ping_timeout * HZ); | |
2089 | } else | |
2090 | next_timeout = last_recv + recv_timeout; | |
2091 | ||
2092 | ISCSI_DBG_CONN(conn, "Setting next tmo %lu\n", next_timeout); | |
2093 | mod_timer(&conn->transport_timer, next_timeout); | |
2094 | done: | |
2095 | spin_unlock(&session->lock); | |
2096 | } | |
2097 | ||
2098 | static void iscsi_prep_abort_task_pdu(struct iscsi_task *task, | |
2099 | struct iscsi_tm *hdr) | |
2100 | { | |
2101 | memset(hdr, 0, sizeof(*hdr)); | |
2102 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
2103 | hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK; | |
2104 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
2105 | memcpy(hdr->lun, task->lun, sizeof(hdr->lun)); | |
2106 | hdr->rtt = task->hdr_itt; | |
2107 | hdr->refcmdsn = task->cmdsn; | |
2108 | } | |
2109 | ||
2110 | int iscsi_eh_abort(struct scsi_cmnd *sc) | |
2111 | { | |
2112 | struct iscsi_cls_session *cls_session; | |
2113 | struct iscsi_session *session; | |
2114 | struct iscsi_conn *conn; | |
2115 | struct iscsi_task *task; | |
2116 | struct iscsi_tm *hdr; | |
2117 | int rc, age; | |
2118 | ||
2119 | cls_session = starget_to_session(scsi_target(sc->device)); | |
2120 | session = cls_session->dd_data; | |
2121 | ||
2122 | ISCSI_DBG_EH(session, "aborting sc %p\n", sc); | |
2123 | ||
2124 | mutex_lock(&session->eh_mutex); | |
2125 | spin_lock_bh(&session->lock); | |
2126 | /* | |
2127 | * if session was ISCSI_STATE_IN_RECOVERY then we may not have | |
2128 | * got the command. | |
2129 | */ | |
2130 | if (!sc->SCp.ptr) { | |
2131 | ISCSI_DBG_EH(session, "sc never reached iscsi layer or " | |
2132 | "it completed.\n"); | |
2133 | spin_unlock_bh(&session->lock); | |
2134 | mutex_unlock(&session->eh_mutex); | |
2135 | return SUCCESS; | |
2136 | } | |
2137 | ||
2138 | /* | |
2139 | * If we are not logged in or we have started a new session | |
2140 | * then let the host reset code handle this | |
2141 | */ | |
2142 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN || | |
2143 | sc->SCp.phase != session->age) { | |
2144 | spin_unlock_bh(&session->lock); | |
2145 | mutex_unlock(&session->eh_mutex); | |
2146 | ISCSI_DBG_EH(session, "failing abort due to dropped " | |
2147 | "session.\n"); | |
2148 | return FAILED; | |
2149 | } | |
2150 | ||
2151 | conn = session->leadconn; | |
2152 | conn->eh_abort_cnt++; | |
2153 | age = session->age; | |
2154 | ||
2155 | task = (struct iscsi_task *)sc->SCp.ptr; | |
2156 | ISCSI_DBG_EH(session, "aborting [sc %p itt 0x%x]\n", | |
2157 | sc, task->itt); | |
2158 | ||
2159 | /* task completed before time out */ | |
2160 | if (!task->sc) { | |
2161 | ISCSI_DBG_EH(session, "sc completed while abort in progress\n"); | |
2162 | goto success; | |
2163 | } | |
2164 | ||
2165 | if (task->state == ISCSI_TASK_PENDING) { | |
2166 | fail_scsi_task(task, DID_ABORT); | |
2167 | goto success; | |
2168 | } | |
2169 | ||
2170 | /* only have one tmf outstanding at a time */ | |
2171 | if (conn->tmf_state != TMF_INITIAL) | |
2172 | goto failed; | |
2173 | conn->tmf_state = TMF_QUEUED; | |
2174 | ||
2175 | hdr = &conn->tmhdr; | |
2176 | iscsi_prep_abort_task_pdu(task, hdr); | |
2177 | ||
2178 | if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout)) { | |
2179 | rc = FAILED; | |
2180 | goto failed; | |
2181 | } | |
2182 | ||
2183 | switch (conn->tmf_state) { | |
2184 | case TMF_SUCCESS: | |
2185 | spin_unlock_bh(&session->lock); | |
2186 | /* | |
2187 | * stop tx side incase the target had sent a abort rsp but | |
2188 | * the initiator was still writing out data. | |
2189 | */ | |
2190 | iscsi_suspend_tx(conn); | |
2191 | /* | |
2192 | * we do not stop the recv side because targets have been | |
2193 | * good and have never sent us a successful tmf response | |
2194 | * then sent more data for the cmd. | |
2195 | */ | |
2196 | spin_lock_bh(&session->lock); | |
2197 | fail_scsi_task(task, DID_ABORT); | |
2198 | conn->tmf_state = TMF_INITIAL; | |
2199 | memset(hdr, 0, sizeof(*hdr)); | |
2200 | spin_unlock_bh(&session->lock); | |
2201 | iscsi_start_tx(conn); | |
2202 | goto success_unlocked; | |
2203 | case TMF_TIMEDOUT: | |
2204 | spin_unlock_bh(&session->lock); | |
2205 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
2206 | goto failed_unlocked; | |
2207 | case TMF_NOT_FOUND: | |
2208 | if (!sc->SCp.ptr) { | |
2209 | conn->tmf_state = TMF_INITIAL; | |
2210 | memset(hdr, 0, sizeof(*hdr)); | |
2211 | /* task completed before tmf abort response */ | |
2212 | ISCSI_DBG_EH(session, "sc completed while abort in " | |
2213 | "progress\n"); | |
2214 | goto success; | |
2215 | } | |
2216 | /* fall through */ | |
2217 | default: | |
2218 | conn->tmf_state = TMF_INITIAL; | |
2219 | goto failed; | |
2220 | } | |
2221 | ||
2222 | success: | |
2223 | spin_unlock_bh(&session->lock); | |
2224 | success_unlocked: | |
2225 | ISCSI_DBG_EH(session, "abort success [sc %p itt 0x%x]\n", | |
2226 | sc, task->itt); | |
2227 | mutex_unlock(&session->eh_mutex); | |
2228 | return SUCCESS; | |
2229 | ||
2230 | failed: | |
2231 | spin_unlock_bh(&session->lock); | |
2232 | failed_unlocked: | |
2233 | ISCSI_DBG_EH(session, "abort failed [sc %p itt 0x%x]\n", sc, | |
2234 | task ? task->itt : 0); | |
2235 | mutex_unlock(&session->eh_mutex); | |
2236 | return FAILED; | |
2237 | } | |
2238 | EXPORT_SYMBOL_GPL(iscsi_eh_abort); | |
2239 | ||
2240 | static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr) | |
2241 | { | |
2242 | memset(hdr, 0, sizeof(*hdr)); | |
2243 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
2244 | hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK; | |
2245 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
2246 | int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun); | |
2247 | hdr->rtt = RESERVED_ITT; | |
2248 | } | |
2249 | ||
2250 | int iscsi_eh_device_reset(struct scsi_cmnd *sc) | |
2251 | { | |
2252 | struct iscsi_cls_session *cls_session; | |
2253 | struct iscsi_session *session; | |
2254 | struct iscsi_conn *conn; | |
2255 | struct iscsi_tm *hdr; | |
2256 | int rc = FAILED; | |
2257 | ||
2258 | cls_session = starget_to_session(scsi_target(sc->device)); | |
2259 | session = cls_session->dd_data; | |
2260 | ||
2261 | ISCSI_DBG_EH(session, "LU Reset [sc %p lun %u]\n", sc, sc->device->lun); | |
2262 | ||
2263 | mutex_lock(&session->eh_mutex); | |
2264 | spin_lock_bh(&session->lock); | |
2265 | /* | |
2266 | * Just check if we are not logged in. We cannot check for | |
2267 | * the phase because the reset could come from a ioctl. | |
2268 | */ | |
2269 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN) | |
2270 | goto unlock; | |
2271 | conn = session->leadconn; | |
2272 | ||
2273 | /* only have one tmf outstanding at a time */ | |
2274 | if (conn->tmf_state != TMF_INITIAL) | |
2275 | goto unlock; | |
2276 | conn->tmf_state = TMF_QUEUED; | |
2277 | ||
2278 | hdr = &conn->tmhdr; | |
2279 | iscsi_prep_lun_reset_pdu(sc, hdr); | |
2280 | ||
2281 | if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age, | |
2282 | session->lu_reset_timeout)) { | |
2283 | rc = FAILED; | |
2284 | goto unlock; | |
2285 | } | |
2286 | ||
2287 | switch (conn->tmf_state) { | |
2288 | case TMF_SUCCESS: | |
2289 | break; | |
2290 | case TMF_TIMEDOUT: | |
2291 | spin_unlock_bh(&session->lock); | |
2292 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
2293 | goto done; | |
2294 | default: | |
2295 | conn->tmf_state = TMF_INITIAL; | |
2296 | goto unlock; | |
2297 | } | |
2298 | ||
2299 | rc = SUCCESS; | |
2300 | spin_unlock_bh(&session->lock); | |
2301 | ||
2302 | iscsi_suspend_tx(conn); | |
2303 | ||
2304 | spin_lock_bh(&session->lock); | |
2305 | memset(hdr, 0, sizeof(*hdr)); | |
2306 | fail_scsi_tasks(conn, sc->device->lun, DID_ERROR); | |
2307 | conn->tmf_state = TMF_INITIAL; | |
2308 | spin_unlock_bh(&session->lock); | |
2309 | ||
2310 | iscsi_start_tx(conn); | |
2311 | goto done; | |
2312 | ||
2313 | unlock: | |
2314 | spin_unlock_bh(&session->lock); | |
2315 | done: | |
2316 | ISCSI_DBG_EH(session, "dev reset result = %s\n", | |
2317 | rc == SUCCESS ? "SUCCESS" : "FAILED"); | |
2318 | mutex_unlock(&session->eh_mutex); | |
2319 | return rc; | |
2320 | } | |
2321 | EXPORT_SYMBOL_GPL(iscsi_eh_device_reset); | |
2322 | ||
2323 | void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session) | |
2324 | { | |
2325 | struct iscsi_session *session = cls_session->dd_data; | |
2326 | ||
2327 | spin_lock_bh(&session->lock); | |
2328 | if (session->state != ISCSI_STATE_LOGGED_IN) { | |
2329 | session->state = ISCSI_STATE_RECOVERY_FAILED; | |
2330 | if (session->leadconn) | |
2331 | wake_up(&session->leadconn->ehwait); | |
2332 | } | |
2333 | spin_unlock_bh(&session->lock); | |
2334 | } | |
2335 | EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout); | |
2336 | ||
2337 | /** | |
2338 | * iscsi_eh_session_reset - drop session and attempt relogin | |
2339 | * @sc: scsi command | |
2340 | * | |
2341 | * This function will wait for a relogin, session termination from | |
2342 | * userspace, or a recovery/replacement timeout. | |
2343 | */ | |
2344 | int iscsi_eh_session_reset(struct scsi_cmnd *sc) | |
2345 | { | |
2346 | struct iscsi_cls_session *cls_session; | |
2347 | struct iscsi_session *session; | |
2348 | struct iscsi_conn *conn; | |
2349 | ||
2350 | cls_session = starget_to_session(scsi_target(sc->device)); | |
2351 | session = cls_session->dd_data; | |
2352 | conn = session->leadconn; | |
2353 | ||
2354 | mutex_lock(&session->eh_mutex); | |
2355 | spin_lock_bh(&session->lock); | |
2356 | if (session->state == ISCSI_STATE_TERMINATE) { | |
2357 | failed: | |
2358 | ISCSI_DBG_EH(session, | |
2359 | "failing session reset: Could not log back into " | |
2360 | "%s, %s [age %d]\n", session->targetname, | |
2361 | conn->persistent_address, session->age); | |
2362 | spin_unlock_bh(&session->lock); | |
2363 | mutex_unlock(&session->eh_mutex); | |
2364 | return FAILED; | |
2365 | } | |
2366 | ||
2367 | spin_unlock_bh(&session->lock); | |
2368 | mutex_unlock(&session->eh_mutex); | |
2369 | /* | |
2370 | * we drop the lock here but the leadconn cannot be destoyed while | |
2371 | * we are in the scsi eh | |
2372 | */ | |
2373 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
2374 | ||
2375 | ISCSI_DBG_EH(session, "wait for relogin\n"); | |
2376 | wait_event_interruptible(conn->ehwait, | |
2377 | session->state == ISCSI_STATE_TERMINATE || | |
2378 | session->state == ISCSI_STATE_LOGGED_IN || | |
2379 | session->state == ISCSI_STATE_RECOVERY_FAILED); | |
2380 | if (signal_pending(current)) | |
2381 | flush_signals(current); | |
2382 | ||
2383 | mutex_lock(&session->eh_mutex); | |
2384 | spin_lock_bh(&session->lock); | |
2385 | if (session->state == ISCSI_STATE_LOGGED_IN) { | |
2386 | ISCSI_DBG_EH(session, | |
2387 | "session reset succeeded for %s,%s\n", | |
2388 | session->targetname, conn->persistent_address); | |
2389 | } else | |
2390 | goto failed; | |
2391 | spin_unlock_bh(&session->lock); | |
2392 | mutex_unlock(&session->eh_mutex); | |
2393 | return SUCCESS; | |
2394 | } | |
2395 | EXPORT_SYMBOL_GPL(iscsi_eh_session_reset); | |
2396 | ||
2397 | static void iscsi_prep_tgt_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr) | |
2398 | { | |
2399 | memset(hdr, 0, sizeof(*hdr)); | |
2400 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
2401 | hdr->flags = ISCSI_TM_FUNC_TARGET_WARM_RESET & ISCSI_FLAG_TM_FUNC_MASK; | |
2402 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
2403 | hdr->rtt = RESERVED_ITT; | |
2404 | } | |
2405 | ||
2406 | /** | |
2407 | * iscsi_eh_target_reset - reset target | |
2408 | * @sc: scsi command | |
2409 | * | |
2410 | * This will attempt to send a warm target reset. | |
2411 | */ | |
2412 | int iscsi_eh_target_reset(struct scsi_cmnd *sc) | |
2413 | { | |
2414 | struct iscsi_cls_session *cls_session; | |
2415 | struct iscsi_session *session; | |
2416 | struct iscsi_conn *conn; | |
2417 | struct iscsi_tm *hdr; | |
2418 | int rc = FAILED; | |
2419 | ||
2420 | cls_session = starget_to_session(scsi_target(sc->device)); | |
2421 | session = cls_session->dd_data; | |
2422 | ||
2423 | ISCSI_DBG_EH(session, "tgt Reset [sc %p tgt %s]\n", sc, | |
2424 | session->targetname); | |
2425 | ||
2426 | mutex_lock(&session->eh_mutex); | |
2427 | spin_lock_bh(&session->lock); | |
2428 | /* | |
2429 | * Just check if we are not logged in. We cannot check for | |
2430 | * the phase because the reset could come from a ioctl. | |
2431 | */ | |
2432 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN) | |
2433 | goto unlock; | |
2434 | conn = session->leadconn; | |
2435 | ||
2436 | /* only have one tmf outstanding at a time */ | |
2437 | if (conn->tmf_state != TMF_INITIAL) | |
2438 | goto unlock; | |
2439 | conn->tmf_state = TMF_QUEUED; | |
2440 | ||
2441 | hdr = &conn->tmhdr; | |
2442 | iscsi_prep_tgt_reset_pdu(sc, hdr); | |
2443 | ||
2444 | if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age, | |
2445 | session->tgt_reset_timeout)) { | |
2446 | rc = FAILED; | |
2447 | goto unlock; | |
2448 | } | |
2449 | ||
2450 | switch (conn->tmf_state) { | |
2451 | case TMF_SUCCESS: | |
2452 | break; | |
2453 | case TMF_TIMEDOUT: | |
2454 | spin_unlock_bh(&session->lock); | |
2455 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
2456 | goto done; | |
2457 | default: | |
2458 | conn->tmf_state = TMF_INITIAL; | |
2459 | goto unlock; | |
2460 | } | |
2461 | ||
2462 | rc = SUCCESS; | |
2463 | spin_unlock_bh(&session->lock); | |
2464 | ||
2465 | iscsi_suspend_tx(conn); | |
2466 | ||
2467 | spin_lock_bh(&session->lock); | |
2468 | memset(hdr, 0, sizeof(*hdr)); | |
2469 | fail_scsi_tasks(conn, -1, DID_ERROR); | |
2470 | conn->tmf_state = TMF_INITIAL; | |
2471 | spin_unlock_bh(&session->lock); | |
2472 | ||
2473 | iscsi_start_tx(conn); | |
2474 | goto done; | |
2475 | ||
2476 | unlock: | |
2477 | spin_unlock_bh(&session->lock); | |
2478 | done: | |
2479 | ISCSI_DBG_EH(session, "tgt %s reset result = %s\n", session->targetname, | |
2480 | rc == SUCCESS ? "SUCCESS" : "FAILED"); | |
2481 | mutex_unlock(&session->eh_mutex); | |
2482 | return rc; | |
2483 | } | |
2484 | EXPORT_SYMBOL_GPL(iscsi_eh_target_reset); | |
2485 | ||
2486 | /** | |
2487 | * iscsi_eh_recover_target - reset target and possibly the session | |
2488 | * @sc: scsi command | |
2489 | * | |
2490 | * This will attempt to send a warm target reset. If that fails, | |
2491 | * we will escalate to ERL0 session recovery. | |
2492 | */ | |
2493 | int iscsi_eh_recover_target(struct scsi_cmnd *sc) | |
2494 | { | |
2495 | int rc; | |
2496 | ||
2497 | rc = iscsi_eh_target_reset(sc); | |
2498 | if (rc == FAILED) | |
2499 | rc = iscsi_eh_session_reset(sc); | |
2500 | return rc; | |
2501 | } | |
2502 | EXPORT_SYMBOL_GPL(iscsi_eh_recover_target); | |
2503 | ||
2504 | /* | |
2505 | * Pre-allocate a pool of @max items of @item_size. By default, the pool | |
2506 | * should be accessed via kfifo_{get,put} on q->queue. | |
2507 | * Optionally, the caller can obtain the array of object pointers | |
2508 | * by passing in a non-NULL @items pointer | |
2509 | */ | |
2510 | int | |
2511 | iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size) | |
2512 | { | |
2513 | int i, num_arrays = 1; | |
2514 | ||
2515 | memset(q, 0, sizeof(*q)); | |
2516 | ||
2517 | q->max = max; | |
2518 | ||
2519 | /* If the user passed an items pointer, he wants a copy of | |
2520 | * the array. */ | |
2521 | if (items) | |
2522 | num_arrays++; | |
2523 | q->pool = kzalloc(num_arrays * max * sizeof(void*), GFP_KERNEL); | |
2524 | if (q->pool == NULL) | |
2525 | return -ENOMEM; | |
2526 | ||
2527 | kfifo_init(&q->queue, (void*)q->pool, max * sizeof(void*)); | |
2528 | ||
2529 | for (i = 0; i < max; i++) { | |
2530 | q->pool[i] = kzalloc(item_size, GFP_KERNEL); | |
2531 | if (q->pool[i] == NULL) { | |
2532 | q->max = i; | |
2533 | goto enomem; | |
2534 | } | |
2535 | kfifo_in(&q->queue, (void*)&q->pool[i], sizeof(void*)); | |
2536 | } | |
2537 | ||
2538 | if (items) { | |
2539 | *items = q->pool + max; | |
2540 | memcpy(*items, q->pool, max * sizeof(void *)); | |
2541 | } | |
2542 | ||
2543 | return 0; | |
2544 | ||
2545 | enomem: | |
2546 | iscsi_pool_free(q); | |
2547 | return -ENOMEM; | |
2548 | } | |
2549 | EXPORT_SYMBOL_GPL(iscsi_pool_init); | |
2550 | ||
2551 | void iscsi_pool_free(struct iscsi_pool *q) | |
2552 | { | |
2553 | int i; | |
2554 | ||
2555 | for (i = 0; i < q->max; i++) | |
2556 | kfree(q->pool[i]); | |
2557 | kfree(q->pool); | |
2558 | } | |
2559 | EXPORT_SYMBOL_GPL(iscsi_pool_free); | |
2560 | ||
2561 | /** | |
2562 | * iscsi_host_add - add host to system | |
2563 | * @shost: scsi host | |
2564 | * @pdev: parent device | |
2565 | * | |
2566 | * This should be called by partial offload and software iscsi drivers | |
2567 | * to add a host to the system. | |
2568 | */ | |
2569 | int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev) | |
2570 | { | |
2571 | if (!shost->can_queue) | |
2572 | shost->can_queue = ISCSI_DEF_XMIT_CMDS_MAX; | |
2573 | ||
2574 | if (!shost->cmd_per_lun) | |
2575 | shost->cmd_per_lun = ISCSI_DEF_CMD_PER_LUN; | |
2576 | ||
2577 | if (!shost->transportt->eh_timed_out) | |
2578 | shost->transportt->eh_timed_out = iscsi_eh_cmd_timed_out; | |
2579 | return scsi_add_host(shost, pdev); | |
2580 | } | |
2581 | EXPORT_SYMBOL_GPL(iscsi_host_add); | |
2582 | ||
2583 | /** | |
2584 | * iscsi_host_alloc - allocate a host and driver data | |
2585 | * @sht: scsi host template | |
2586 | * @dd_data_size: driver host data size | |
2587 | * @xmit_can_sleep: bool indicating if LLD will queue IO from a work queue | |
2588 | * | |
2589 | * This should be called by partial offload and software iscsi drivers. | |
2590 | * To access the driver specific memory use the iscsi_host_priv() macro. | |
2591 | */ | |
2592 | struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht, | |
2593 | int dd_data_size, bool xmit_can_sleep) | |
2594 | { | |
2595 | struct Scsi_Host *shost; | |
2596 | struct iscsi_host *ihost; | |
2597 | ||
2598 | shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size); | |
2599 | if (!shost) | |
2600 | return NULL; | |
2601 | ihost = shost_priv(shost); | |
2602 | ||
2603 | if (xmit_can_sleep) { | |
2604 | snprintf(ihost->workq_name, sizeof(ihost->workq_name), | |
2605 | "iscsi_q_%d", shost->host_no); | |
2606 | ihost->workq = create_singlethread_workqueue(ihost->workq_name); | |
2607 | if (!ihost->workq) | |
2608 | goto free_host; | |
2609 | } | |
2610 | ||
2611 | spin_lock_init(&ihost->lock); | |
2612 | ihost->state = ISCSI_HOST_SETUP; | |
2613 | ihost->num_sessions = 0; | |
2614 | init_waitqueue_head(&ihost->session_removal_wq); | |
2615 | return shost; | |
2616 | ||
2617 | free_host: | |
2618 | scsi_host_put(shost); | |
2619 | return NULL; | |
2620 | } | |
2621 | EXPORT_SYMBOL_GPL(iscsi_host_alloc); | |
2622 | ||
2623 | static void iscsi_notify_host_removed(struct iscsi_cls_session *cls_session) | |
2624 | { | |
2625 | iscsi_session_failure(cls_session->dd_data, ISCSI_ERR_INVALID_HOST); | |
2626 | } | |
2627 | ||
2628 | /** | |
2629 | * iscsi_host_remove - remove host and sessions | |
2630 | * @shost: scsi host | |
2631 | * | |
2632 | * If there are any sessions left, this will initiate the removal and wait | |
2633 | * for the completion. | |
2634 | */ | |
2635 | void iscsi_host_remove(struct Scsi_Host *shost) | |
2636 | { | |
2637 | struct iscsi_host *ihost = shost_priv(shost); | |
2638 | unsigned long flags; | |
2639 | ||
2640 | spin_lock_irqsave(&ihost->lock, flags); | |
2641 | ihost->state = ISCSI_HOST_REMOVED; | |
2642 | spin_unlock_irqrestore(&ihost->lock, flags); | |
2643 | ||
2644 | iscsi_host_for_each_session(shost, iscsi_notify_host_removed); | |
2645 | wait_event_interruptible(ihost->session_removal_wq, | |
2646 | ihost->num_sessions == 0); | |
2647 | if (signal_pending(current)) | |
2648 | flush_signals(current); | |
2649 | ||
2650 | scsi_remove_host(shost); | |
2651 | if (ihost->workq) | |
2652 | destroy_workqueue(ihost->workq); | |
2653 | } | |
2654 | EXPORT_SYMBOL_GPL(iscsi_host_remove); | |
2655 | ||
2656 | void iscsi_host_free(struct Scsi_Host *shost) | |
2657 | { | |
2658 | struct iscsi_host *ihost = shost_priv(shost); | |
2659 | ||
2660 | kfree(ihost->netdev); | |
2661 | kfree(ihost->hwaddress); | |
2662 | kfree(ihost->initiatorname); | |
2663 | scsi_host_put(shost); | |
2664 | } | |
2665 | EXPORT_SYMBOL_GPL(iscsi_host_free); | |
2666 | ||
2667 | static void iscsi_host_dec_session_cnt(struct Scsi_Host *shost) | |
2668 | { | |
2669 | struct iscsi_host *ihost = shost_priv(shost); | |
2670 | unsigned long flags; | |
2671 | ||
2672 | shost = scsi_host_get(shost); | |
2673 | if (!shost) { | |
2674 | printk(KERN_ERR "Invalid state. Cannot notify host removal " | |
2675 | "of session teardown event because host already " | |
2676 | "removed.\n"); | |
2677 | return; | |
2678 | } | |
2679 | ||
2680 | spin_lock_irqsave(&ihost->lock, flags); | |
2681 | ihost->num_sessions--; | |
2682 | if (ihost->num_sessions == 0) | |
2683 | wake_up(&ihost->session_removal_wq); | |
2684 | spin_unlock_irqrestore(&ihost->lock, flags); | |
2685 | scsi_host_put(shost); | |
2686 | } | |
2687 | ||
2688 | /** | |
2689 | * iscsi_session_setup - create iscsi cls session and host and session | |
2690 | * @iscsit: iscsi transport template | |
2691 | * @shost: scsi host | |
2692 | * @cmds_max: session can queue | |
2693 | * @cmd_task_size: LLD task private data size | |
2694 | * @initial_cmdsn: initial CmdSN | |
2695 | * | |
2696 | * This can be used by software iscsi_transports that allocate | |
2697 | * a session per scsi host. | |
2698 | * | |
2699 | * Callers should set cmds_max to the largest total numer (mgmt + scsi) of | |
2700 | * tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks | |
2701 | * for nop handling and login/logout requests. | |
2702 | */ | |
2703 | struct iscsi_cls_session * | |
2704 | iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost, | |
2705 | uint16_t cmds_max, int dd_size, int cmd_task_size, | |
2706 | uint32_t initial_cmdsn, unsigned int id) | |
2707 | { | |
2708 | struct iscsi_host *ihost = shost_priv(shost); | |
2709 | struct iscsi_session *session; | |
2710 | struct iscsi_cls_session *cls_session; | |
2711 | int cmd_i, scsi_cmds, total_cmds = cmds_max; | |
2712 | unsigned long flags; | |
2713 | ||
2714 | spin_lock_irqsave(&ihost->lock, flags); | |
2715 | if (ihost->state == ISCSI_HOST_REMOVED) { | |
2716 | spin_unlock_irqrestore(&ihost->lock, flags); | |
2717 | return NULL; | |
2718 | } | |
2719 | ihost->num_sessions++; | |
2720 | spin_unlock_irqrestore(&ihost->lock, flags); | |
2721 | ||
2722 | if (!total_cmds) | |
2723 | total_cmds = ISCSI_DEF_XMIT_CMDS_MAX; | |
2724 | /* | |
2725 | * The iscsi layer needs some tasks for nop handling and tmfs, | |
2726 | * so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX | |
2727 | * + 1 command for scsi IO. | |
2728 | */ | |
2729 | if (total_cmds < ISCSI_TOTAL_CMDS_MIN) { | |
2730 | printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " | |
2731 | "must be a power of two that is at least %d.\n", | |
2732 | total_cmds, ISCSI_TOTAL_CMDS_MIN); | |
2733 | goto dec_session_count; | |
2734 | } | |
2735 | ||
2736 | if (total_cmds > ISCSI_TOTAL_CMDS_MAX) { | |
2737 | printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " | |
2738 | "must be a power of 2 less than or equal to %d.\n", | |
2739 | cmds_max, ISCSI_TOTAL_CMDS_MAX); | |
2740 | total_cmds = ISCSI_TOTAL_CMDS_MAX; | |
2741 | } | |
2742 | ||
2743 | if (!is_power_of_2(total_cmds)) { | |
2744 | printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " | |
2745 | "must be a power of 2.\n", total_cmds); | |
2746 | total_cmds = rounddown_pow_of_two(total_cmds); | |
2747 | if (total_cmds < ISCSI_TOTAL_CMDS_MIN) | |
2748 | return NULL; | |
2749 | printk(KERN_INFO "iscsi: Rounding can_queue to %d.\n", | |
2750 | total_cmds); | |
2751 | } | |
2752 | scsi_cmds = total_cmds - ISCSI_MGMT_CMDS_MAX; | |
2753 | ||
2754 | cls_session = iscsi_alloc_session(shost, iscsit, | |
2755 | sizeof(struct iscsi_session) + | |
2756 | dd_size); | |
2757 | if (!cls_session) | |
2758 | goto dec_session_count; | |
2759 | session = cls_session->dd_data; | |
2760 | session->cls_session = cls_session; | |
2761 | session->host = shost; | |
2762 | session->state = ISCSI_STATE_FREE; | |
2763 | session->fast_abort = 1; | |
2764 | session->tgt_reset_timeout = 30; | |
2765 | session->lu_reset_timeout = 15; | |
2766 | session->abort_timeout = 10; | |
2767 | session->scsi_cmds_max = scsi_cmds; | |
2768 | session->cmds_max = total_cmds; | |
2769 | session->queued_cmdsn = session->cmdsn = initial_cmdsn; | |
2770 | session->exp_cmdsn = initial_cmdsn + 1; | |
2771 | session->max_cmdsn = initial_cmdsn + 1; | |
2772 | session->max_r2t = 1; | |
2773 | session->tt = iscsit; | |
2774 | session->dd_data = cls_session->dd_data + sizeof(*session); | |
2775 | mutex_init(&session->eh_mutex); | |
2776 | spin_lock_init(&session->lock); | |
2777 | ||
2778 | /* initialize SCSI PDU commands pool */ | |
2779 | if (iscsi_pool_init(&session->cmdpool, session->cmds_max, | |
2780 | (void***)&session->cmds, | |
2781 | cmd_task_size + sizeof(struct iscsi_task))) | |
2782 | goto cmdpool_alloc_fail; | |
2783 | ||
2784 | /* pre-format cmds pool with ITT */ | |
2785 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
2786 | struct iscsi_task *task = session->cmds[cmd_i]; | |
2787 | ||
2788 | if (cmd_task_size) | |
2789 | task->dd_data = &task[1]; | |
2790 | task->itt = cmd_i; | |
2791 | task->state = ISCSI_TASK_FREE; | |
2792 | INIT_LIST_HEAD(&task->running); | |
2793 | } | |
2794 | ||
2795 | if (!try_module_get(iscsit->owner)) | |
2796 | goto module_get_fail; | |
2797 | ||
2798 | if (iscsi_add_session(cls_session, id)) | |
2799 | goto cls_session_fail; | |
2800 | ||
2801 | return cls_session; | |
2802 | ||
2803 | cls_session_fail: | |
2804 | module_put(iscsit->owner); | |
2805 | module_get_fail: | |
2806 | iscsi_pool_free(&session->cmdpool); | |
2807 | cmdpool_alloc_fail: | |
2808 | iscsi_free_session(cls_session); | |
2809 | dec_session_count: | |
2810 | iscsi_host_dec_session_cnt(shost); | |
2811 | return NULL; | |
2812 | } | |
2813 | EXPORT_SYMBOL_GPL(iscsi_session_setup); | |
2814 | ||
2815 | /** | |
2816 | * iscsi_session_teardown - destroy session, host, and cls_session | |
2817 | * @cls_session: iscsi session | |
2818 | * | |
2819 | * The driver must have called iscsi_remove_session before | |
2820 | * calling this. | |
2821 | */ | |
2822 | void iscsi_session_teardown(struct iscsi_cls_session *cls_session) | |
2823 | { | |
2824 | struct iscsi_session *session = cls_session->dd_data; | |
2825 | struct module *owner = cls_session->transport->owner; | |
2826 | struct Scsi_Host *shost = session->host; | |
2827 | ||
2828 | iscsi_pool_free(&session->cmdpool); | |
2829 | ||
2830 | kfree(session->password); | |
2831 | kfree(session->password_in); | |
2832 | kfree(session->username); | |
2833 | kfree(session->username_in); | |
2834 | kfree(session->targetname); | |
2835 | kfree(session->initiatorname); | |
2836 | kfree(session->ifacename); | |
2837 | ||
2838 | iscsi_destroy_session(cls_session); | |
2839 | iscsi_host_dec_session_cnt(shost); | |
2840 | module_put(owner); | |
2841 | } | |
2842 | EXPORT_SYMBOL_GPL(iscsi_session_teardown); | |
2843 | ||
2844 | /** | |
2845 | * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn | |
2846 | * @cls_session: iscsi_cls_session | |
2847 | * @dd_size: private driver data size | |
2848 | * @conn_idx: cid | |
2849 | */ | |
2850 | struct iscsi_cls_conn * | |
2851 | iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size, | |
2852 | uint32_t conn_idx) | |
2853 | { | |
2854 | struct iscsi_session *session = cls_session->dd_data; | |
2855 | struct iscsi_conn *conn; | |
2856 | struct iscsi_cls_conn *cls_conn; | |
2857 | char *data; | |
2858 | ||
2859 | cls_conn = iscsi_create_conn(cls_session, sizeof(*conn) + dd_size, | |
2860 | conn_idx); | |
2861 | if (!cls_conn) | |
2862 | return NULL; | |
2863 | conn = cls_conn->dd_data; | |
2864 | memset(conn, 0, sizeof(*conn) + dd_size); | |
2865 | ||
2866 | conn->dd_data = cls_conn->dd_data + sizeof(*conn); | |
2867 | conn->session = session; | |
2868 | conn->cls_conn = cls_conn; | |
2869 | conn->c_stage = ISCSI_CONN_INITIAL_STAGE; | |
2870 | conn->id = conn_idx; | |
2871 | conn->exp_statsn = 0; | |
2872 | conn->tmf_state = TMF_INITIAL; | |
2873 | ||
2874 | init_timer(&conn->transport_timer); | |
2875 | conn->transport_timer.data = (unsigned long)conn; | |
2876 | conn->transport_timer.function = iscsi_check_transport_timeouts; | |
2877 | ||
2878 | INIT_LIST_HEAD(&conn->mgmtqueue); | |
2879 | INIT_LIST_HEAD(&conn->cmdqueue); | |
2880 | INIT_LIST_HEAD(&conn->requeue); | |
2881 | INIT_WORK(&conn->xmitwork, iscsi_xmitworker); | |
2882 | ||
2883 | /* allocate login_task used for the login/text sequences */ | |
2884 | spin_lock_bh(&session->lock); | |
2885 | if (!kfifo_out(&session->cmdpool.queue, | |
2886 | (void*)&conn->login_task, | |
2887 | sizeof(void*))) { | |
2888 | spin_unlock_bh(&session->lock); | |
2889 | goto login_task_alloc_fail; | |
2890 | } | |
2891 | spin_unlock_bh(&session->lock); | |
2892 | ||
2893 | data = (char *) __get_free_pages(GFP_KERNEL, | |
2894 | get_order(ISCSI_DEF_MAX_RECV_SEG_LEN)); | |
2895 | if (!data) | |
2896 | goto login_task_data_alloc_fail; | |
2897 | conn->login_task->data = conn->data = data; | |
2898 | ||
2899 | init_timer(&conn->tmf_timer); | |
2900 | init_waitqueue_head(&conn->ehwait); | |
2901 | ||
2902 | return cls_conn; | |
2903 | ||
2904 | login_task_data_alloc_fail: | |
2905 | kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task, | |
2906 | sizeof(void*)); | |
2907 | login_task_alloc_fail: | |
2908 | iscsi_destroy_conn(cls_conn); | |
2909 | return NULL; | |
2910 | } | |
2911 | EXPORT_SYMBOL_GPL(iscsi_conn_setup); | |
2912 | ||
2913 | /** | |
2914 | * iscsi_conn_teardown - teardown iscsi connection | |
2915 | * cls_conn: iscsi class connection | |
2916 | * | |
2917 | * TODO: we may need to make this into a two step process | |
2918 | * like scsi-mls remove + put host | |
2919 | */ | |
2920 | void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn) | |
2921 | { | |
2922 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2923 | struct iscsi_session *session = conn->session; | |
2924 | unsigned long flags; | |
2925 | ||
2926 | del_timer_sync(&conn->transport_timer); | |
2927 | ||
2928 | spin_lock_bh(&session->lock); | |
2929 | conn->c_stage = ISCSI_CONN_CLEANUP_WAIT; | |
2930 | if (session->leadconn == conn) { | |
2931 | /* | |
2932 | * leading connection? then give up on recovery. | |
2933 | */ | |
2934 | session->state = ISCSI_STATE_TERMINATE; | |
2935 | wake_up(&conn->ehwait); | |
2936 | } | |
2937 | spin_unlock_bh(&session->lock); | |
2938 | ||
2939 | /* | |
2940 | * Block until all in-progress commands for this connection | |
2941 | * time out or fail. | |
2942 | */ | |
2943 | for (;;) { | |
2944 | spin_lock_irqsave(session->host->host_lock, flags); | |
2945 | if (!session->host->host_busy) { /* OK for ERL == 0 */ | |
2946 | spin_unlock_irqrestore(session->host->host_lock, flags); | |
2947 | break; | |
2948 | } | |
2949 | spin_unlock_irqrestore(session->host->host_lock, flags); | |
2950 | msleep_interruptible(500); | |
2951 | iscsi_conn_printk(KERN_INFO, conn, "iscsi conn_destroy(): " | |
2952 | "host_busy %d host_failed %d\n", | |
2953 | session->host->host_busy, | |
2954 | session->host->host_failed); | |
2955 | /* | |
2956 | * force eh_abort() to unblock | |
2957 | */ | |
2958 | wake_up(&conn->ehwait); | |
2959 | } | |
2960 | ||
2961 | /* flush queued up work because we free the connection below */ | |
2962 | iscsi_suspend_tx(conn); | |
2963 | ||
2964 | spin_lock_bh(&session->lock); | |
2965 | free_pages((unsigned long) conn->data, | |
2966 | get_order(ISCSI_DEF_MAX_RECV_SEG_LEN)); | |
2967 | kfree(conn->persistent_address); | |
2968 | kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task, | |
2969 | sizeof(void*)); | |
2970 | if (session->leadconn == conn) | |
2971 | session->leadconn = NULL; | |
2972 | spin_unlock_bh(&session->lock); | |
2973 | ||
2974 | iscsi_destroy_conn(cls_conn); | |
2975 | } | |
2976 | EXPORT_SYMBOL_GPL(iscsi_conn_teardown); | |
2977 | ||
2978 | int iscsi_conn_start(struct iscsi_cls_conn *cls_conn) | |
2979 | { | |
2980 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2981 | struct iscsi_session *session = conn->session; | |
2982 | ||
2983 | if (!session) { | |
2984 | iscsi_conn_printk(KERN_ERR, conn, | |
2985 | "can't start unbound connection\n"); | |
2986 | return -EPERM; | |
2987 | } | |
2988 | ||
2989 | if ((session->imm_data_en || !session->initial_r2t_en) && | |
2990 | session->first_burst > session->max_burst) { | |
2991 | iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: " | |
2992 | "first_burst %d max_burst %d\n", | |
2993 | session->first_burst, session->max_burst); | |
2994 | return -EINVAL; | |
2995 | } | |
2996 | ||
2997 | if (conn->ping_timeout && !conn->recv_timeout) { | |
2998 | iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of " | |
2999 | "zero. Using 5 seconds\n."); | |
3000 | conn->recv_timeout = 5; | |
3001 | } | |
3002 | ||
3003 | if (conn->recv_timeout && !conn->ping_timeout) { | |
3004 | iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of " | |
3005 | "zero. Using 5 seconds.\n"); | |
3006 | conn->ping_timeout = 5; | |
3007 | } | |
3008 | ||
3009 | spin_lock_bh(&session->lock); | |
3010 | conn->c_stage = ISCSI_CONN_STARTED; | |
3011 | session->state = ISCSI_STATE_LOGGED_IN; | |
3012 | session->queued_cmdsn = session->cmdsn; | |
3013 | ||
3014 | conn->last_recv = jiffies; | |
3015 | conn->last_ping = jiffies; | |
3016 | if (conn->recv_timeout && conn->ping_timeout) | |
3017 | mod_timer(&conn->transport_timer, | |
3018 | jiffies + (conn->recv_timeout * HZ)); | |
3019 | ||
3020 | switch(conn->stop_stage) { | |
3021 | case STOP_CONN_RECOVER: | |
3022 | /* | |
3023 | * unblock eh_abort() if it is blocked. re-try all | |
3024 | * commands after successful recovery | |
3025 | */ | |
3026 | conn->stop_stage = 0; | |
3027 | conn->tmf_state = TMF_INITIAL; | |
3028 | session->age++; | |
3029 | if (session->age == 16) | |
3030 | session->age = 0; | |
3031 | break; | |
3032 | case STOP_CONN_TERM: | |
3033 | conn->stop_stage = 0; | |
3034 | break; | |
3035 | default: | |
3036 | break; | |
3037 | } | |
3038 | spin_unlock_bh(&session->lock); | |
3039 | ||
3040 | iscsi_unblock_session(session->cls_session); | |
3041 | wake_up(&conn->ehwait); | |
3042 | return 0; | |
3043 | } | |
3044 | EXPORT_SYMBOL_GPL(iscsi_conn_start); | |
3045 | ||
3046 | static void | |
3047 | fail_mgmt_tasks(struct iscsi_session *session, struct iscsi_conn *conn) | |
3048 | { | |
3049 | struct iscsi_task *task; | |
3050 | int i, state; | |
3051 | ||
3052 | for (i = 0; i < conn->session->cmds_max; i++) { | |
3053 | task = conn->session->cmds[i]; | |
3054 | if (task->sc) | |
3055 | continue; | |
3056 | ||
3057 | if (task->state == ISCSI_TASK_FREE) | |
3058 | continue; | |
3059 | ||
3060 | ISCSI_DBG_SESSION(conn->session, | |
3061 | "failing mgmt itt 0x%x state %d\n", | |
3062 | task->itt, task->state); | |
3063 | state = ISCSI_TASK_ABRT_SESS_RECOV; | |
3064 | if (task->state == ISCSI_TASK_PENDING) | |
3065 | state = ISCSI_TASK_COMPLETED; | |
3066 | iscsi_complete_task(task, state); | |
3067 | ||
3068 | } | |
3069 | } | |
3070 | ||
3071 | static void iscsi_start_session_recovery(struct iscsi_session *session, | |
3072 | struct iscsi_conn *conn, int flag) | |
3073 | { | |
3074 | int old_stop_stage; | |
3075 | ||
3076 | mutex_lock(&session->eh_mutex); | |
3077 | spin_lock_bh(&session->lock); | |
3078 | if (conn->stop_stage == STOP_CONN_TERM) { | |
3079 | spin_unlock_bh(&session->lock); | |
3080 | mutex_unlock(&session->eh_mutex); | |
3081 | return; | |
3082 | } | |
3083 | ||
3084 | /* | |
3085 | * When this is called for the in_login state, we only want to clean | |
3086 | * up the login task and connection. We do not need to block and set | |
3087 | * the recovery state again | |
3088 | */ | |
3089 | if (flag == STOP_CONN_TERM) | |
3090 | session->state = ISCSI_STATE_TERMINATE; | |
3091 | else if (conn->stop_stage != STOP_CONN_RECOVER) | |
3092 | session->state = ISCSI_STATE_IN_RECOVERY; | |
3093 | ||
3094 | old_stop_stage = conn->stop_stage; | |
3095 | conn->stop_stage = flag; | |
3096 | spin_unlock_bh(&session->lock); | |
3097 | ||
3098 | del_timer_sync(&conn->transport_timer); | |
3099 | iscsi_suspend_tx(conn); | |
3100 | ||
3101 | spin_lock_bh(&session->lock); | |
3102 | conn->c_stage = ISCSI_CONN_STOPPED; | |
3103 | spin_unlock_bh(&session->lock); | |
3104 | ||
3105 | /* | |
3106 | * for connection level recovery we should not calculate | |
3107 | * header digest. conn->hdr_size used for optimization | |
3108 | * in hdr_extract() and will be re-negotiated at | |
3109 | * set_param() time. | |
3110 | */ | |
3111 | if (flag == STOP_CONN_RECOVER) { | |
3112 | conn->hdrdgst_en = 0; | |
3113 | conn->datadgst_en = 0; | |
3114 | if (session->state == ISCSI_STATE_IN_RECOVERY && | |
3115 | old_stop_stage != STOP_CONN_RECOVER) { | |
3116 | ISCSI_DBG_SESSION(session, "blocking session\n"); | |
3117 | iscsi_block_session(session->cls_session); | |
3118 | } | |
3119 | } | |
3120 | ||
3121 | /* | |
3122 | * flush queues. | |
3123 | */ | |
3124 | spin_lock_bh(&session->lock); | |
3125 | fail_scsi_tasks(conn, -1, DID_TRANSPORT_DISRUPTED); | |
3126 | fail_mgmt_tasks(session, conn); | |
3127 | memset(&conn->tmhdr, 0, sizeof(conn->tmhdr)); | |
3128 | spin_unlock_bh(&session->lock); | |
3129 | mutex_unlock(&session->eh_mutex); | |
3130 | } | |
3131 | ||
3132 | void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) | |
3133 | { | |
3134 | struct iscsi_conn *conn = cls_conn->dd_data; | |
3135 | struct iscsi_session *session = conn->session; | |
3136 | ||
3137 | switch (flag) { | |
3138 | case STOP_CONN_RECOVER: | |
3139 | case STOP_CONN_TERM: | |
3140 | iscsi_start_session_recovery(session, conn, flag); | |
3141 | break; | |
3142 | default: | |
3143 | iscsi_conn_printk(KERN_ERR, conn, | |
3144 | "invalid stop flag %d\n", flag); | |
3145 | } | |
3146 | } | |
3147 | EXPORT_SYMBOL_GPL(iscsi_conn_stop); | |
3148 | ||
3149 | int iscsi_conn_bind(struct iscsi_cls_session *cls_session, | |
3150 | struct iscsi_cls_conn *cls_conn, int is_leading) | |
3151 | { | |
3152 | struct iscsi_session *session = cls_session->dd_data; | |
3153 | struct iscsi_conn *conn = cls_conn->dd_data; | |
3154 | ||
3155 | spin_lock_bh(&session->lock); | |
3156 | if (is_leading) | |
3157 | session->leadconn = conn; | |
3158 | spin_unlock_bh(&session->lock); | |
3159 | ||
3160 | /* | |
3161 | * Unblock xmitworker(), Login Phase will pass through. | |
3162 | */ | |
3163 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
3164 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
3165 | return 0; | |
3166 | } | |
3167 | EXPORT_SYMBOL_GPL(iscsi_conn_bind); | |
3168 | ||
3169 | static int iscsi_switch_str_param(char **param, char *new_val_buf) | |
3170 | { | |
3171 | char *new_val; | |
3172 | ||
3173 | if (*param) { | |
3174 | if (!strcmp(*param, new_val_buf)) | |
3175 | return 0; | |
3176 | } | |
3177 | ||
3178 | new_val = kstrdup(new_val_buf, GFP_NOIO); | |
3179 | if (!new_val) | |
3180 | return -ENOMEM; | |
3181 | ||
3182 | kfree(*param); | |
3183 | *param = new_val; | |
3184 | return 0; | |
3185 | } | |
3186 | ||
3187 | int iscsi_set_param(struct iscsi_cls_conn *cls_conn, | |
3188 | enum iscsi_param param, char *buf, int buflen) | |
3189 | { | |
3190 | struct iscsi_conn *conn = cls_conn->dd_data; | |
3191 | struct iscsi_session *session = conn->session; | |
3192 | uint32_t value; | |
3193 | ||
3194 | switch(param) { | |
3195 | case ISCSI_PARAM_FAST_ABORT: | |
3196 | sscanf(buf, "%d", &session->fast_abort); | |
3197 | break; | |
3198 | case ISCSI_PARAM_ABORT_TMO: | |
3199 | sscanf(buf, "%d", &session->abort_timeout); | |
3200 | break; | |
3201 | case ISCSI_PARAM_LU_RESET_TMO: | |
3202 | sscanf(buf, "%d", &session->lu_reset_timeout); | |
3203 | break; | |
3204 | case ISCSI_PARAM_TGT_RESET_TMO: | |
3205 | sscanf(buf, "%d", &session->tgt_reset_timeout); | |
3206 | break; | |
3207 | case ISCSI_PARAM_PING_TMO: | |
3208 | sscanf(buf, "%d", &conn->ping_timeout); | |
3209 | break; | |
3210 | case ISCSI_PARAM_RECV_TMO: | |
3211 | sscanf(buf, "%d", &conn->recv_timeout); | |
3212 | break; | |
3213 | case ISCSI_PARAM_MAX_RECV_DLENGTH: | |
3214 | sscanf(buf, "%d", &conn->max_recv_dlength); | |
3215 | break; | |
3216 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
3217 | sscanf(buf, "%d", &conn->max_xmit_dlength); | |
3218 | break; | |
3219 | case ISCSI_PARAM_HDRDGST_EN: | |
3220 | sscanf(buf, "%d", &conn->hdrdgst_en); | |
3221 | break; | |
3222 | case ISCSI_PARAM_DATADGST_EN: | |
3223 | sscanf(buf, "%d", &conn->datadgst_en); | |
3224 | break; | |
3225 | case ISCSI_PARAM_INITIAL_R2T_EN: | |
3226 | sscanf(buf, "%d", &session->initial_r2t_en); | |
3227 | break; | |
3228 | case ISCSI_PARAM_MAX_R2T: | |
3229 | sscanf(buf, "%d", &session->max_r2t); | |
3230 | break; | |
3231 | case ISCSI_PARAM_IMM_DATA_EN: | |
3232 | sscanf(buf, "%d", &session->imm_data_en); | |
3233 | break; | |
3234 | case ISCSI_PARAM_FIRST_BURST: | |
3235 | sscanf(buf, "%d", &session->first_burst); | |
3236 | break; | |
3237 | case ISCSI_PARAM_MAX_BURST: | |
3238 | sscanf(buf, "%d", &session->max_burst); | |
3239 | break; | |
3240 | case ISCSI_PARAM_PDU_INORDER_EN: | |
3241 | sscanf(buf, "%d", &session->pdu_inorder_en); | |
3242 | break; | |
3243 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
3244 | sscanf(buf, "%d", &session->dataseq_inorder_en); | |
3245 | break; | |
3246 | case ISCSI_PARAM_ERL: | |
3247 | sscanf(buf, "%d", &session->erl); | |
3248 | break; | |
3249 | case ISCSI_PARAM_IFMARKER_EN: | |
3250 | sscanf(buf, "%d", &value); | |
3251 | BUG_ON(value); | |
3252 | break; | |
3253 | case ISCSI_PARAM_OFMARKER_EN: | |
3254 | sscanf(buf, "%d", &value); | |
3255 | BUG_ON(value); | |
3256 | break; | |
3257 | case ISCSI_PARAM_EXP_STATSN: | |
3258 | sscanf(buf, "%u", &conn->exp_statsn); | |
3259 | break; | |
3260 | case ISCSI_PARAM_USERNAME: | |
3261 | return iscsi_switch_str_param(&session->username, buf); | |
3262 | case ISCSI_PARAM_USERNAME_IN: | |
3263 | return iscsi_switch_str_param(&session->username_in, buf); | |
3264 | case ISCSI_PARAM_PASSWORD: | |
3265 | return iscsi_switch_str_param(&session->password, buf); | |
3266 | case ISCSI_PARAM_PASSWORD_IN: | |
3267 | return iscsi_switch_str_param(&session->password_in, buf); | |
3268 | case ISCSI_PARAM_TARGET_NAME: | |
3269 | return iscsi_switch_str_param(&session->targetname, buf); | |
3270 | case ISCSI_PARAM_TPGT: | |
3271 | sscanf(buf, "%d", &session->tpgt); | |
3272 | break; | |
3273 | case ISCSI_PARAM_PERSISTENT_PORT: | |
3274 | sscanf(buf, "%d", &conn->persistent_port); | |
3275 | break; | |
3276 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
3277 | return iscsi_switch_str_param(&conn->persistent_address, buf); | |
3278 | case ISCSI_PARAM_IFACE_NAME: | |
3279 | return iscsi_switch_str_param(&session->ifacename, buf); | |
3280 | case ISCSI_PARAM_INITIATOR_NAME: | |
3281 | return iscsi_switch_str_param(&session->initiatorname, buf); | |
3282 | default: | |
3283 | return -ENOSYS; | |
3284 | } | |
3285 | ||
3286 | return 0; | |
3287 | } | |
3288 | EXPORT_SYMBOL_GPL(iscsi_set_param); | |
3289 | ||
3290 | int iscsi_session_get_param(struct iscsi_cls_session *cls_session, | |
3291 | enum iscsi_param param, char *buf) | |
3292 | { | |
3293 | struct iscsi_session *session = cls_session->dd_data; | |
3294 | int len; | |
3295 | ||
3296 | switch(param) { | |
3297 | case ISCSI_PARAM_FAST_ABORT: | |
3298 | len = sprintf(buf, "%d\n", session->fast_abort); | |
3299 | break; | |
3300 | case ISCSI_PARAM_ABORT_TMO: | |
3301 | len = sprintf(buf, "%d\n", session->abort_timeout); | |
3302 | break; | |
3303 | case ISCSI_PARAM_LU_RESET_TMO: | |
3304 | len = sprintf(buf, "%d\n", session->lu_reset_timeout); | |
3305 | break; | |
3306 | case ISCSI_PARAM_TGT_RESET_TMO: | |
3307 | len = sprintf(buf, "%d\n", session->tgt_reset_timeout); | |
3308 | break; | |
3309 | case ISCSI_PARAM_INITIAL_R2T_EN: | |
3310 | len = sprintf(buf, "%d\n", session->initial_r2t_en); | |
3311 | break; | |
3312 | case ISCSI_PARAM_MAX_R2T: | |
3313 | len = sprintf(buf, "%hu\n", session->max_r2t); | |
3314 | break; | |
3315 | case ISCSI_PARAM_IMM_DATA_EN: | |
3316 | len = sprintf(buf, "%d\n", session->imm_data_en); | |
3317 | break; | |
3318 | case ISCSI_PARAM_FIRST_BURST: | |
3319 | len = sprintf(buf, "%u\n", session->first_burst); | |
3320 | break; | |
3321 | case ISCSI_PARAM_MAX_BURST: | |
3322 | len = sprintf(buf, "%u\n", session->max_burst); | |
3323 | break; | |
3324 | case ISCSI_PARAM_PDU_INORDER_EN: | |
3325 | len = sprintf(buf, "%d\n", session->pdu_inorder_en); | |
3326 | break; | |
3327 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
3328 | len = sprintf(buf, "%d\n", session->dataseq_inorder_en); | |
3329 | break; | |
3330 | case ISCSI_PARAM_ERL: | |
3331 | len = sprintf(buf, "%d\n", session->erl); | |
3332 | break; | |
3333 | case ISCSI_PARAM_TARGET_NAME: | |
3334 | len = sprintf(buf, "%s\n", session->targetname); | |
3335 | break; | |
3336 | case ISCSI_PARAM_TPGT: | |
3337 | len = sprintf(buf, "%d\n", session->tpgt); | |
3338 | break; | |
3339 | case ISCSI_PARAM_USERNAME: | |
3340 | len = sprintf(buf, "%s\n", session->username); | |
3341 | break; | |
3342 | case ISCSI_PARAM_USERNAME_IN: | |
3343 | len = sprintf(buf, "%s\n", session->username_in); | |
3344 | break; | |
3345 | case ISCSI_PARAM_PASSWORD: | |
3346 | len = sprintf(buf, "%s\n", session->password); | |
3347 | break; | |
3348 | case ISCSI_PARAM_PASSWORD_IN: | |
3349 | len = sprintf(buf, "%s\n", session->password_in); | |
3350 | break; | |
3351 | case ISCSI_PARAM_IFACE_NAME: | |
3352 | len = sprintf(buf, "%s\n", session->ifacename); | |
3353 | break; | |
3354 | case ISCSI_PARAM_INITIATOR_NAME: | |
3355 | len = sprintf(buf, "%s\n", session->initiatorname); | |
3356 | break; | |
3357 | default: | |
3358 | return -ENOSYS; | |
3359 | } | |
3360 | ||
3361 | return len; | |
3362 | } | |
3363 | EXPORT_SYMBOL_GPL(iscsi_session_get_param); | |
3364 | ||
3365 | int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn, | |
3366 | enum iscsi_param param, char *buf) | |
3367 | { | |
3368 | struct iscsi_conn *conn = cls_conn->dd_data; | |
3369 | int len; | |
3370 | ||
3371 | switch(param) { | |
3372 | case ISCSI_PARAM_PING_TMO: | |
3373 | len = sprintf(buf, "%u\n", conn->ping_timeout); | |
3374 | break; | |
3375 | case ISCSI_PARAM_RECV_TMO: | |
3376 | len = sprintf(buf, "%u\n", conn->recv_timeout); | |
3377 | break; | |
3378 | case ISCSI_PARAM_MAX_RECV_DLENGTH: | |
3379 | len = sprintf(buf, "%u\n", conn->max_recv_dlength); | |
3380 | break; | |
3381 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
3382 | len = sprintf(buf, "%u\n", conn->max_xmit_dlength); | |
3383 | break; | |
3384 | case ISCSI_PARAM_HDRDGST_EN: | |
3385 | len = sprintf(buf, "%d\n", conn->hdrdgst_en); | |
3386 | break; | |
3387 | case ISCSI_PARAM_DATADGST_EN: | |
3388 | len = sprintf(buf, "%d\n", conn->datadgst_en); | |
3389 | break; | |
3390 | case ISCSI_PARAM_IFMARKER_EN: | |
3391 | len = sprintf(buf, "%d\n", conn->ifmarker_en); | |
3392 | break; | |
3393 | case ISCSI_PARAM_OFMARKER_EN: | |
3394 | len = sprintf(buf, "%d\n", conn->ofmarker_en); | |
3395 | break; | |
3396 | case ISCSI_PARAM_EXP_STATSN: | |
3397 | len = sprintf(buf, "%u\n", conn->exp_statsn); | |
3398 | break; | |
3399 | case ISCSI_PARAM_PERSISTENT_PORT: | |
3400 | len = sprintf(buf, "%d\n", conn->persistent_port); | |
3401 | break; | |
3402 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
3403 | len = sprintf(buf, "%s\n", conn->persistent_address); | |
3404 | break; | |
3405 | default: | |
3406 | return -ENOSYS; | |
3407 | } | |
3408 | ||
3409 | return len; | |
3410 | } | |
3411 | EXPORT_SYMBOL_GPL(iscsi_conn_get_param); | |
3412 | ||
3413 | int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param, | |
3414 | char *buf) | |
3415 | { | |
3416 | struct iscsi_host *ihost = shost_priv(shost); | |
3417 | int len; | |
3418 | ||
3419 | switch (param) { | |
3420 | case ISCSI_HOST_PARAM_NETDEV_NAME: | |
3421 | len = sprintf(buf, "%s\n", ihost->netdev); | |
3422 | break; | |
3423 | case ISCSI_HOST_PARAM_HWADDRESS: | |
3424 | len = sprintf(buf, "%s\n", ihost->hwaddress); | |
3425 | break; | |
3426 | case ISCSI_HOST_PARAM_INITIATOR_NAME: | |
3427 | len = sprintf(buf, "%s\n", ihost->initiatorname); | |
3428 | break; | |
3429 | case ISCSI_HOST_PARAM_IPADDRESS: | |
3430 | len = sprintf(buf, "%s\n", ihost->local_address); | |
3431 | break; | |
3432 | default: | |
3433 | return -ENOSYS; | |
3434 | } | |
3435 | ||
3436 | return len; | |
3437 | } | |
3438 | EXPORT_SYMBOL_GPL(iscsi_host_get_param); | |
3439 | ||
3440 | int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param, | |
3441 | char *buf, int buflen) | |
3442 | { | |
3443 | struct iscsi_host *ihost = shost_priv(shost); | |
3444 | ||
3445 | switch (param) { | |
3446 | case ISCSI_HOST_PARAM_NETDEV_NAME: | |
3447 | return iscsi_switch_str_param(&ihost->netdev, buf); | |
3448 | case ISCSI_HOST_PARAM_HWADDRESS: | |
3449 | return iscsi_switch_str_param(&ihost->hwaddress, buf); | |
3450 | case ISCSI_HOST_PARAM_INITIATOR_NAME: | |
3451 | return iscsi_switch_str_param(&ihost->initiatorname, buf); | |
3452 | default: | |
3453 | return -ENOSYS; | |
3454 | } | |
3455 | ||
3456 | return 0; | |
3457 | } | |
3458 | EXPORT_SYMBOL_GPL(iscsi_host_set_param); | |
3459 | ||
3460 | MODULE_AUTHOR("Mike Christie"); | |
3461 | MODULE_DESCRIPTION("iSCSI library functions"); | |
3462 | MODULE_LICENSE("GPL"); |