1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * iSCSI lib functions |
4 | * |
5 | * Copyright (C) 2006 Red Hat, Inc. All rights reserved. |
6 | * Copyright (C) 2004 - 2006 Mike Christie |
7 | * Copyright (C) 2004 - 2005 Dmitry Yusupov |
8 | * Copyright (C) 2004 - 2005 Alex Aizman |
9 | * maintained by open-iscsi@googlegroups.com |
10 | */ |
11 | #include <linux/types.h> |
12 | #include <linux/kfifo.h> |
13 | #include <linux/delay.h> |
14 | #include <linux/log2.h> |
15 | #include <linux/slab.h> |
16 | #include <linux/sched/signal.h> |
17 | #include <linux/module.h> |
18 | #include <asm/unaligned.h> |
19 | #include <net/tcp.h> |
20 | #include <scsi/scsi_cmnd.h> |
21 | #include <scsi/scsi_device.h> |
22 | #include <scsi/scsi_eh.h> |
23 | #include <scsi/scsi_tcq.h> |
24 | #include <scsi/scsi_host.h> |
25 | #include <scsi/scsi.h> |
26 | #include <scsi/iscsi_proto.h> |
27 | #include <scsi/scsi_transport.h> |
28 | #include <scsi/scsi_transport_iscsi.h> |
29 | #include <scsi/libiscsi.h> |
30 | #include <trace/events/iscsi.h> |
31 | |
32 | static int iscsi_dbg_lib_conn; |
33 | module_param_named(debug_libiscsi_conn, iscsi_dbg_lib_conn, int, |
34 | S_IRUGO | S_IWUSR); |
35 | MODULE_PARM_DESC(debug_libiscsi_conn, |
36 | "Turn on debugging for connections in libiscsi module. " |
37 | "Set to 1 to turn on, and zero to turn off. Default is off." ); |
38 | |
39 | static int iscsi_dbg_lib_session; |
40 | module_param_named(debug_libiscsi_session, iscsi_dbg_lib_session, int, |
41 | S_IRUGO | S_IWUSR); |
42 | MODULE_PARM_DESC(debug_libiscsi_session, |
43 | "Turn on debugging for sessions in libiscsi module. " |
44 | "Set to 1 to turn on, and zero to turn off. Default is off." ); |
45 | |
46 | static int iscsi_dbg_lib_eh; |
47 | module_param_named(debug_libiscsi_eh, iscsi_dbg_lib_eh, int, |
48 | S_IRUGO | S_IWUSR); |
49 | MODULE_PARM_DESC(debug_libiscsi_eh, |
50 | "Turn on debugging for error handling in libiscsi module. " |
51 | "Set to 1 to turn on, and zero to turn off. Default is off." ); |
52 | |
53 | #define ISCSI_DBG_CONN(_conn, dbg_fmt, arg...) \ |
54 | do { \ |
55 | if (iscsi_dbg_lib_conn) \ |
56 | iscsi_conn_printk(KERN_INFO, _conn, \ |
57 | "%s " dbg_fmt, \ |
58 | __func__, ##arg); \ |
59 | iscsi_dbg_trace(trace_iscsi_dbg_conn, \ |
60 | &(_conn)->cls_conn->dev, \ |
61 | "%s " dbg_fmt, __func__, ##arg);\ |
62 | } while (0); |
63 | |
64 | #define ISCSI_DBG_SESSION(_session, dbg_fmt, arg...) \ |
65 | do { \ |
66 | if (iscsi_dbg_lib_session) \ |
67 | iscsi_session_printk(KERN_INFO, _session, \ |
68 | "%s " dbg_fmt, \ |
69 | __func__, ##arg); \ |
70 | iscsi_dbg_trace(trace_iscsi_dbg_session, \ |
71 | &(_session)->cls_session->dev, \ |
72 | "%s " dbg_fmt, __func__, ##arg); \ |
73 | } while (0); |
74 | |
75 | #define ISCSI_DBG_EH(_session, dbg_fmt, arg...) \ |
76 | do { \ |
77 | if (iscsi_dbg_lib_eh) \ |
78 | iscsi_session_printk(KERN_INFO, _session, \ |
79 | "%s " dbg_fmt, \ |
80 | __func__, ##arg); \ |
81 | iscsi_dbg_trace(trace_iscsi_dbg_eh, \ |
82 | &(_session)->cls_session->dev, \ |
83 | "%s " dbg_fmt, __func__, ##arg); \ |
84 | } while (0); |
85 | |
86 | #define ISCSI_CMD_COMPL_WAIT 5 |
87 | |
88 | inline void iscsi_conn_queue_xmit(struct iscsi_conn *conn) |
89 | { |
90 | struct Scsi_Host *shost = conn->session->host; |
91 | struct iscsi_host *ihost = shost_priv(shost); |
92 | |
93 | if (ihost->workq) |
94 | queue_work(wq: ihost->workq, work: &conn->xmitwork); |
95 | } |
96 | EXPORT_SYMBOL_GPL(iscsi_conn_queue_xmit); |
97 | |
98 | inline void iscsi_conn_queue_recv(struct iscsi_conn *conn) |
99 | { |
100 | struct Scsi_Host *shost = conn->session->host; |
101 | struct iscsi_host *ihost = shost_priv(shost); |
102 | |
103 | if (ihost->workq && !test_bit(ISCSI_CONN_FLAG_SUSPEND_RX, &conn->flags)) |
104 | queue_work(wq: ihost->workq, work: &conn->recvwork); |
105 | } |
106 | EXPORT_SYMBOL_GPL(iscsi_conn_queue_recv); |
107 | |
108 | static void __iscsi_update_cmdsn(struct iscsi_session *session, |
109 | uint32_t exp_cmdsn, uint32_t max_cmdsn) |
110 | { |
111 | /* |
112 | * standard specifies this check for when to update expected and |
113 | * max sequence numbers |
114 | */ |
115 | if (iscsi_sna_lt(n1: max_cmdsn, n2: exp_cmdsn - 1)) |
116 | return; |
117 | |
118 | if (exp_cmdsn != session->exp_cmdsn && |
119 | !iscsi_sna_lt(n1: exp_cmdsn, n2: session->exp_cmdsn)) |
120 | session->exp_cmdsn = exp_cmdsn; |
121 | |
122 | if (max_cmdsn != session->max_cmdsn && |
123 | !iscsi_sna_lt(n1: max_cmdsn, n2: session->max_cmdsn)) |
124 | session->max_cmdsn = max_cmdsn; |
125 | } |
126 | |
127 | void iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr) |
128 | { |
129 | __iscsi_update_cmdsn(session, be32_to_cpu(hdr->exp_cmdsn), |
130 | be32_to_cpu(hdr->max_cmdsn)); |
131 | } |
132 | EXPORT_SYMBOL_GPL(iscsi_update_cmdsn); |
133 | |
134 | /** |
135 | * iscsi_prep_data_out_pdu - initialize Data-Out |
136 | * @task: scsi command task |
137 | * @r2t: R2T info |
138 | * @hdr: iscsi data in pdu |
139 | * |
140 | * Notes: |
141 | * Initialize Data-Out within this R2T sequence and finds |
142 | * proper data_offset within this SCSI command. |
143 | * |
144 | * This function is called with connection lock taken. |
145 | **/ |
146 | void iscsi_prep_data_out_pdu(struct iscsi_task *task, struct iscsi_r2t_info *r2t, |
147 | struct iscsi_data *hdr) |
148 | { |
149 | struct iscsi_conn *conn = task->conn; |
150 | unsigned int left = r2t->data_length - r2t->sent; |
151 | |
152 | task->hdr_len = sizeof(struct iscsi_data); |
153 | |
154 | memset(hdr, 0, sizeof(struct iscsi_data)); |
155 | hdr->ttt = r2t->ttt; |
156 | hdr->datasn = cpu_to_be32(r2t->datasn); |
157 | r2t->datasn++; |
158 | hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; |
159 | hdr->lun = task->lun; |
160 | hdr->itt = task->hdr_itt; |
161 | hdr->exp_statsn = r2t->exp_statsn; |
162 | hdr->offset = cpu_to_be32(r2t->data_offset + r2t->sent); |
163 | if (left > conn->max_xmit_dlength) { |
164 | hton24(hdr->dlength, conn->max_xmit_dlength); |
165 | r2t->data_count = conn->max_xmit_dlength; |
166 | hdr->flags = 0; |
167 | } else { |
168 | hton24(hdr->dlength, left); |
169 | r2t->data_count = left; |
170 | hdr->flags = ISCSI_FLAG_CMD_FINAL; |
171 | } |
172 | conn->dataout_pdus_cnt++; |
173 | } |
174 | EXPORT_SYMBOL_GPL(iscsi_prep_data_out_pdu); |
175 | |
176 | static int iscsi_add_hdr(struct iscsi_task *task, unsigned len) |
177 | { |
178 | unsigned exp_len = task->hdr_len + len; |
179 | |
180 | if (exp_len > task->hdr_max) { |
181 | WARN_ON(1); |
182 | return -EINVAL; |
183 | } |
184 | |
185 | WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */ |
186 | task->hdr_len = exp_len; |
187 | return 0; |
188 | } |
189 | |
190 | /* |
191 | * make an extended cdb AHS |
192 | */ |
193 | static int iscsi_prep_ecdb_ahs(struct iscsi_task *task) |
194 | { |
195 | struct scsi_cmnd *cmd = task->sc; |
196 | unsigned rlen, pad_len; |
197 | unsigned short ahslength; |
198 | struct iscsi_ecdb_ahdr *ecdb_ahdr; |
199 | int rc; |
200 | |
201 | ecdb_ahdr = iscsi_next_hdr(task); |
202 | rlen = cmd->cmd_len - ISCSI_CDB_SIZE; |
203 | |
204 | BUG_ON(rlen > sizeof(ecdb_ahdr->ecdb)); |
205 | ahslength = rlen + sizeof(ecdb_ahdr->reserved); |
206 | |
207 | pad_len = iscsi_padding(len: rlen); |
208 | |
209 | rc = iscsi_add_hdr(task, len: sizeof(ecdb_ahdr->ahslength) + |
210 | sizeof(ecdb_ahdr->ahstype) + ahslength + pad_len); |
211 | if (rc) |
212 | return rc; |
213 | |
214 | if (pad_len) |
215 | memset(&ecdb_ahdr->ecdb[rlen], 0, pad_len); |
216 | |
217 | ecdb_ahdr->ahslength = cpu_to_be16(ahslength); |
218 | ecdb_ahdr->ahstype = ISCSI_AHSTYPE_CDB; |
219 | ecdb_ahdr->reserved = 0; |
220 | memcpy(ecdb_ahdr->ecdb, cmd->cmnd + ISCSI_CDB_SIZE, rlen); |
221 | |
222 | ISCSI_DBG_SESSION(task->conn->session, |
223 | "iscsi_prep_ecdb_ahs: varlen_cdb_len %d " |
224 | "rlen %d pad_len %d ahs_length %d iscsi_headers_size " |
225 | "%u\n" , cmd->cmd_len, rlen, pad_len, ahslength, |
226 | task->hdr_len); |
227 | return 0; |
228 | } |
229 | |
230 | /** |
231 | * iscsi_check_tmf_restrictions - check if a task is affected by TMF |
232 | * @task: iscsi task |
233 | * @opcode: opcode to check for |
234 | * |
235 | * During TMF a task has to be checked if it's affected. |
236 | * All unrelated I/O can be passed through, but I/O to the |
237 | * affected LUN should be restricted. |
238 | * If 'fast_abort' is set we won't be sending any I/O to the |
239 | * affected LUN. |
240 | * Otherwise the target is waiting for all TTTs to be completed, |
241 | * so we have to send all outstanding Data-Out PDUs to the target. |
242 | */ |
243 | static int iscsi_check_tmf_restrictions(struct iscsi_task *task, int opcode) |
244 | { |
245 | struct iscsi_session *session = task->conn->session; |
246 | struct iscsi_tm *tmf = &session->tmhdr; |
247 | u64 hdr_lun; |
248 | |
249 | if (session->tmf_state == TMF_INITIAL) |
250 | return 0; |
251 | |
252 | if ((tmf->opcode & ISCSI_OPCODE_MASK) != ISCSI_OP_SCSI_TMFUNC) |
253 | return 0; |
254 | |
255 | switch (ISCSI_TM_FUNC_VALUE(tmf)) { |
256 | case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: |
257 | /* |
258 | * Allow PDUs for unrelated LUNs |
259 | */ |
260 | hdr_lun = scsilun_to_int(&tmf->lun); |
261 | if (hdr_lun != task->sc->device->lun) |
262 | return 0; |
263 | fallthrough; |
264 | case ISCSI_TM_FUNC_TARGET_WARM_RESET: |
265 | /* |
266 | * Fail all SCSI cmd PDUs |
267 | */ |
268 | if (opcode != ISCSI_OP_SCSI_DATA_OUT) { |
269 | iscsi_session_printk(KERN_INFO, session, |
270 | "task [op %x itt 0x%x/0x%x] rejected.\n" , |
271 | opcode, task->itt, task->hdr_itt); |
272 | return -EACCES; |
273 | } |
274 | /* |
275 | * And also all data-out PDUs in response to R2T |
276 | * if fast_abort is set. |
277 | */ |
278 | if (session->fast_abort) { |
279 | iscsi_session_printk(KERN_INFO, session, |
280 | "task [op %x itt 0x%x/0x%x] fast abort.\n" , |
281 | opcode, task->itt, task->hdr_itt); |
282 | return -EACCES; |
283 | } |
284 | break; |
285 | case ISCSI_TM_FUNC_ABORT_TASK: |
286 | /* |
287 | * the caller has already checked if the task |
288 | * they want to abort was in the pending queue so if |
289 | * we are here the cmd pdu has gone out already, and |
290 | * we will only hit this for data-outs |
291 | */ |
292 | if (opcode == ISCSI_OP_SCSI_DATA_OUT && |
293 | task->hdr_itt == tmf->rtt) { |
294 | ISCSI_DBG_SESSION(session, |
295 | "Preventing task %x/%x from sending " |
296 | "data-out due to abort task in " |
297 | "progress\n" , task->itt, |
298 | task->hdr_itt); |
299 | return -EACCES; |
300 | } |
301 | break; |
302 | } |
303 | |
304 | return 0; |
305 | } |
306 | |
307 | /** |
308 | * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu |
309 | * @task: iscsi task |
310 | * |
311 | * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set |
312 | * fields like dlength or final based on how much data it sends |
313 | */ |
314 | static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task) |
315 | { |
316 | struct iscsi_conn *conn = task->conn; |
317 | struct iscsi_session *session = conn->session; |
318 | struct scsi_cmnd *sc = task->sc; |
319 | struct iscsi_scsi_req *hdr; |
320 | unsigned hdrlength, cmd_len, transfer_length; |
321 | itt_t itt; |
322 | int rc; |
323 | |
324 | rc = iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_CMD); |
325 | if (rc) |
326 | return rc; |
327 | |
328 | if (conn->session->tt->alloc_pdu) { |
329 | rc = conn->session->tt->alloc_pdu(task, ISCSI_OP_SCSI_CMD); |
330 | if (rc) |
331 | return rc; |
332 | } |
333 | hdr = (struct iscsi_scsi_req *)task->hdr; |
334 | itt = hdr->itt; |
335 | memset(hdr, 0, sizeof(*hdr)); |
336 | |
337 | if (session->tt->parse_pdu_itt) |
338 | hdr->itt = task->hdr_itt = itt; |
339 | else |
340 | hdr->itt = task->hdr_itt = build_itt(task->itt, |
341 | task->conn->session->age); |
342 | task->hdr_len = 0; |
343 | rc = iscsi_add_hdr(task, len: sizeof(*hdr)); |
344 | if (rc) |
345 | return rc; |
346 | hdr->opcode = ISCSI_OP_SCSI_CMD; |
347 | hdr->flags = ISCSI_ATTR_SIMPLE; |
348 | int_to_scsilun(sc->device->lun, &hdr->lun); |
349 | task->lun = hdr->lun; |
350 | hdr->exp_statsn = cpu_to_be32(conn->exp_statsn); |
351 | cmd_len = sc->cmd_len; |
352 | if (cmd_len < ISCSI_CDB_SIZE) |
353 | memset(&hdr->cdb[cmd_len], 0, ISCSI_CDB_SIZE - cmd_len); |
354 | else if (cmd_len > ISCSI_CDB_SIZE) { |
355 | rc = iscsi_prep_ecdb_ahs(task); |
356 | if (rc) |
357 | return rc; |
358 | cmd_len = ISCSI_CDB_SIZE; |
359 | } |
360 | memcpy(hdr->cdb, sc->cmnd, cmd_len); |
361 | |
362 | task->imm_count = 0; |
363 | if (scsi_get_prot_op(scmd: sc) != SCSI_PROT_NORMAL) |
364 | task->protected = true; |
365 | |
366 | transfer_length = scsi_transfer_length(scmd: sc); |
367 | hdr->data_length = cpu_to_be32(transfer_length); |
368 | if (sc->sc_data_direction == DMA_TO_DEVICE) { |
369 | struct iscsi_r2t_info *r2t = &task->unsol_r2t; |
370 | |
371 | hdr->flags |= ISCSI_FLAG_CMD_WRITE; |
372 | /* |
373 | * Write counters: |
374 | * |
375 | * imm_count bytes to be sent right after |
376 | * SCSI PDU Header |
377 | * |
378 | * unsol_count bytes(as Data-Out) to be sent |
379 | * without R2T ack right after |
380 | * immediate data |
381 | * |
382 | * r2t data_length bytes to be sent via R2T ack's |
383 | * |
384 | * pad_count bytes to be sent as zero-padding |
385 | */ |
386 | memset(r2t, 0, sizeof(*r2t)); |
387 | |
388 | if (session->imm_data_en) { |
389 | if (transfer_length >= session->first_burst) |
390 | task->imm_count = min(session->first_burst, |
391 | conn->max_xmit_dlength); |
392 | else |
393 | task->imm_count = min(transfer_length, |
394 | conn->max_xmit_dlength); |
395 | hton24(hdr->dlength, task->imm_count); |
396 | } else |
397 | zero_data(hdr->dlength); |
398 | |
399 | if (!session->initial_r2t_en) { |
400 | r2t->data_length = min(session->first_burst, |
401 | transfer_length) - |
402 | task->imm_count; |
403 | r2t->data_offset = task->imm_count; |
404 | r2t->ttt = cpu_to_be32(ISCSI_RESERVED_TAG); |
405 | r2t->exp_statsn = cpu_to_be32(conn->exp_statsn); |
406 | } |
407 | |
408 | if (!task->unsol_r2t.data_length) |
409 | /* No unsolicit Data-Out's */ |
410 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; |
411 | } else { |
412 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; |
413 | zero_data(hdr->dlength); |
414 | |
415 | if (sc->sc_data_direction == DMA_FROM_DEVICE) |
416 | hdr->flags |= ISCSI_FLAG_CMD_READ; |
417 | } |
418 | |
419 | /* calculate size of additional header segments (AHSs) */ |
420 | hdrlength = task->hdr_len - sizeof(*hdr); |
421 | |
422 | WARN_ON(hdrlength & (ISCSI_PAD_LEN-1)); |
423 | hdrlength /= ISCSI_PAD_LEN; |
424 | |
425 | WARN_ON(hdrlength >= 256); |
426 | hdr->hlength = hdrlength & 0xFF; |
427 | hdr->cmdsn = task->cmdsn = cpu_to_be32(session->cmdsn); |
428 | |
429 | if (session->tt->init_task && session->tt->init_task(task)) |
430 | return -EIO; |
431 | |
432 | task->state = ISCSI_TASK_RUNNING; |
433 | session->cmdsn++; |
434 | |
435 | conn->scsicmd_pdus_cnt++; |
436 | ISCSI_DBG_SESSION(session, "iscsi prep [%s cid %d sc %p cdb 0x%x " |
437 | "itt 0x%x len %d cmdsn %d win %d]\n" , |
438 | sc->sc_data_direction == DMA_TO_DEVICE ? |
439 | "write" : "read" , conn->id, sc, sc->cmnd[0], |
440 | task->itt, transfer_length, |
441 | session->cmdsn, |
442 | session->max_cmdsn - session->exp_cmdsn + 1); |
443 | return 0; |
444 | } |
445 | |
446 | /** |
447 | * iscsi_free_task - free a task |
448 | * @task: iscsi cmd task |
449 | * |
450 | * Must be called with session back_lock. |
451 | * This function returns the scsi command to scsi-ml or cleans |
452 | * up mgmt tasks then returns the task to the pool. |
453 | */ |
454 | static void iscsi_free_task(struct iscsi_task *task) |
455 | { |
456 | struct iscsi_conn *conn = task->conn; |
457 | struct iscsi_session *session = conn->session; |
458 | struct scsi_cmnd *sc = task->sc; |
459 | int oldstate = task->state; |
460 | |
461 | ISCSI_DBG_SESSION(session, "freeing task itt 0x%x state %d sc %p\n" , |
462 | task->itt, task->state, task->sc); |
463 | |
464 | session->tt->cleanup_task(task); |
465 | task->state = ISCSI_TASK_FREE; |
466 | task->sc = NULL; |
467 | /* |
468 | * login task is preallocated so do not free |
469 | */ |
470 | if (conn->login_task == task) |
471 | return; |
472 | |
473 | kfifo_in(&session->cmdpool.queue, (void*)&task, sizeof(void*)); |
474 | |
475 | if (sc) { |
476 | /* SCSI eh reuses commands to verify us */ |
477 | iscsi_cmd(cmd: sc)->task = NULL; |
478 | /* |
479 | * queue command may call this to free the task, so |
480 | * it will decide how to return sc to scsi-ml. |
481 | */ |
482 | if (oldstate != ISCSI_TASK_REQUEUE_SCSIQ) |
483 | scsi_done(cmd: sc); |
484 | } |
485 | } |
486 | |
487 | bool iscsi_get_task(struct iscsi_task *task) |
488 | { |
489 | return refcount_inc_not_zero(r: &task->refcount); |
490 | } |
491 | EXPORT_SYMBOL_GPL(iscsi_get_task); |
492 | |
493 | /** |
494 | * __iscsi_put_task - drop the refcount on a task |
495 | * @task: iscsi_task to drop the refcount on |
496 | * |
497 | * The back_lock must be held when calling in case it frees the task. |
498 | */ |
499 | void __iscsi_put_task(struct iscsi_task *task) |
500 | { |
501 | if (refcount_dec_and_test(r: &task->refcount)) |
502 | iscsi_free_task(task); |
503 | } |
504 | EXPORT_SYMBOL_GPL(__iscsi_put_task); |
505 | |
506 | void iscsi_put_task(struct iscsi_task *task) |
507 | { |
508 | struct iscsi_session *session = task->conn->session; |
509 | |
510 | if (refcount_dec_and_test(r: &task->refcount)) { |
511 | spin_lock_bh(lock: &session->back_lock); |
512 | iscsi_free_task(task); |
513 | spin_unlock_bh(lock: &session->back_lock); |
514 | } |
515 | } |
516 | EXPORT_SYMBOL_GPL(iscsi_put_task); |
517 | |
518 | /** |
519 | * iscsi_complete_task - finish a task |
520 | * @task: iscsi cmd task |
521 | * @state: state to complete task with |
522 | * |
523 | * Must be called with session back_lock. |
524 | */ |
525 | static void iscsi_complete_task(struct iscsi_task *task, int state) |
526 | { |
527 | struct iscsi_conn *conn = task->conn; |
528 | |
529 | ISCSI_DBG_SESSION(conn->session, |
530 | "complete task itt 0x%x state %d sc %p\n" , |
531 | task->itt, task->state, task->sc); |
532 | if (task->state == ISCSI_TASK_COMPLETED || |
533 | task->state == ISCSI_TASK_ABRT_TMF || |
534 | task->state == ISCSI_TASK_ABRT_SESS_RECOV || |
535 | task->state == ISCSI_TASK_REQUEUE_SCSIQ) |
536 | return; |
537 | WARN_ON_ONCE(task->state == ISCSI_TASK_FREE); |
538 | task->state = state; |
539 | |
540 | if (READ_ONCE(conn->ping_task) == task) |
541 | WRITE_ONCE(conn->ping_task, NULL); |
542 | |
543 | /* release get from queueing */ |
544 | __iscsi_put_task(task); |
545 | } |
546 | |
547 | /** |
548 | * iscsi_complete_scsi_task - finish scsi task normally |
549 | * @task: iscsi task for scsi cmd |
550 | * @exp_cmdsn: expected cmd sn in cpu format |
551 | * @max_cmdsn: max cmd sn in cpu format |
552 | * |
553 | * This is used when drivers do not need or cannot perform |
554 | * lower level pdu processing. |
555 | * |
556 | * Called with session back_lock |
557 | */ |
558 | void iscsi_complete_scsi_task(struct iscsi_task *task, |
559 | uint32_t exp_cmdsn, uint32_t max_cmdsn) |
560 | { |
561 | struct iscsi_conn *conn = task->conn; |
562 | |
563 | ISCSI_DBG_SESSION(conn->session, "[itt 0x%x]\n" , task->itt); |
564 | |
565 | conn->last_recv = jiffies; |
566 | __iscsi_update_cmdsn(session: conn->session, exp_cmdsn, max_cmdsn); |
567 | iscsi_complete_task(task, state: ISCSI_TASK_COMPLETED); |
568 | } |
569 | EXPORT_SYMBOL_GPL(iscsi_complete_scsi_task); |
570 | |
571 | /* |
572 | * Must be called with back and frwd lock |
573 | */ |
574 | static bool cleanup_queued_task(struct iscsi_task *task) |
575 | { |
576 | struct iscsi_conn *conn = task->conn; |
577 | bool early_complete = false; |
578 | |
579 | /* |
580 | * We might have raced where we handled a R2T early and got a response |
581 | * but have not yet taken the task off the requeue list, then a TMF or |
582 | * recovery happened and so we can still see it here. |
583 | */ |
584 | if (task->state == ISCSI_TASK_COMPLETED) |
585 | early_complete = true; |
586 | |
587 | if (!list_empty(head: &task->running)) { |
588 | list_del_init(entry: &task->running); |
589 | /* |
590 | * If it's on a list but still running this could be cleanup |
591 | * from a TMF or session recovery. |
592 | */ |
593 | if (task->state == ISCSI_TASK_RUNNING || |
594 | task->state == ISCSI_TASK_COMPLETED) |
595 | __iscsi_put_task(task); |
596 | } |
597 | |
598 | if (conn->session->running_aborted_task == task) { |
599 | conn->session->running_aborted_task = NULL; |
600 | __iscsi_put_task(task); |
601 | } |
602 | |
603 | if (conn->task == task) { |
604 | conn->task = NULL; |
605 | __iscsi_put_task(task); |
606 | } |
607 | |
608 | return early_complete; |
609 | } |
610 | |
611 | /* |
612 | * session back and frwd lock must be held and if not called for a task that |
613 | * is still pending or from the xmit thread, then xmit thread must be suspended |
614 | */ |
615 | static void __fail_scsi_task(struct iscsi_task *task, int err) |
616 | { |
617 | struct iscsi_conn *conn = task->conn; |
618 | struct scsi_cmnd *sc; |
619 | int state; |
620 | |
621 | if (cleanup_queued_task(task)) |
622 | return; |
623 | |
624 | if (task->state == ISCSI_TASK_PENDING) { |
625 | /* |
626 | * cmd never made it to the xmit thread, so we should not count |
627 | * the cmd in the sequencing |
628 | */ |
629 | conn->session->queued_cmdsn--; |
630 | /* it was never sent so just complete like normal */ |
631 | state = ISCSI_TASK_COMPLETED; |
632 | } else if (err == DID_TRANSPORT_DISRUPTED) |
633 | state = ISCSI_TASK_ABRT_SESS_RECOV; |
634 | else |
635 | state = ISCSI_TASK_ABRT_TMF; |
636 | |
637 | sc = task->sc; |
638 | sc->result = err << 16; |
639 | scsi_set_resid(cmd: sc, resid: scsi_bufflen(cmd: sc)); |
640 | iscsi_complete_task(task, state); |
641 | } |
642 | |
643 | static void fail_scsi_task(struct iscsi_task *task, int err) |
644 | { |
645 | struct iscsi_session *session = task->conn->session; |
646 | |
647 | spin_lock_bh(lock: &session->back_lock); |
648 | __fail_scsi_task(task, err); |
649 | spin_unlock_bh(lock: &session->back_lock); |
650 | } |
651 | |
652 | static int iscsi_prep_mgmt_task(struct iscsi_conn *conn, |
653 | struct iscsi_task *task) |
654 | { |
655 | struct iscsi_session *session = conn->session; |
656 | struct iscsi_hdr *hdr = task->hdr; |
657 | struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr; |
658 | uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK; |
659 | |
660 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) |
661 | return -ENOTCONN; |
662 | |
663 | if (opcode != ISCSI_OP_LOGIN && opcode != ISCSI_OP_TEXT) |
664 | nop->exp_statsn = cpu_to_be32(conn->exp_statsn); |
665 | /* |
666 | * pre-format CmdSN for outgoing PDU. |
667 | */ |
668 | nop->cmdsn = cpu_to_be32(session->cmdsn); |
669 | if (hdr->itt != RESERVED_ITT) { |
670 | /* |
671 | * TODO: We always use immediate for normal session pdus. |
672 | * If we start to send tmfs or nops as non-immediate then |
673 | * we should start checking the cmdsn numbers for mgmt tasks. |
674 | * |
675 | * During discovery sessions iscsid sends TEXT as non immediate, |
676 | * but we always only send one PDU at a time. |
677 | */ |
678 | if (conn->c_stage == ISCSI_CONN_STARTED && |
679 | !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { |
680 | session->queued_cmdsn++; |
681 | session->cmdsn++; |
682 | } |
683 | } |
684 | |
685 | if (session->tt->init_task && session->tt->init_task(task)) |
686 | return -EIO; |
687 | |
688 | if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT) |
689 | session->state = ISCSI_STATE_LOGGING_OUT; |
690 | |
691 | task->state = ISCSI_TASK_RUNNING; |
692 | ISCSI_DBG_SESSION(session, "mgmtpdu [op 0x%x hdr->itt 0x%x " |
693 | "datalen %d]\n" , hdr->opcode & ISCSI_OPCODE_MASK, |
694 | hdr->itt, task->data_count); |
695 | return 0; |
696 | } |
697 | |
698 | /** |
699 | * iscsi_alloc_mgmt_task - allocate and setup a mgmt task. |
700 | * @conn: iscsi conn that the task will be sent on. |
701 | * @hdr: iscsi pdu that will be sent. |
702 | * @data: buffer for data segment if needed. |
703 | * @data_size: length of data in bytes. |
704 | */ |
705 | static struct iscsi_task * |
706 | iscsi_alloc_mgmt_task(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
707 | char *data, uint32_t data_size) |
708 | { |
709 | struct iscsi_session *session = conn->session; |
710 | uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK; |
711 | struct iscsi_task *task; |
712 | itt_t itt; |
713 | |
714 | if (session->state == ISCSI_STATE_TERMINATE || |
715 | !test_bit(ISCSI_CONN_FLAG_BOUND, &conn->flags)) |
716 | return NULL; |
717 | |
718 | if (opcode == ISCSI_OP_LOGIN || opcode == ISCSI_OP_TEXT) { |
719 | /* |
720 | * Login and Text are sent serially, in |
721 | * request-followed-by-response sequence. |
722 | * Same task can be used. Same ITT must be used. |
723 | * Note that login_task is preallocated at conn_create(). |
724 | */ |
725 | if (conn->login_task->state != ISCSI_TASK_FREE) { |
726 | iscsi_conn_printk(KERN_ERR, conn, "Login/Text in " |
727 | "progress. Cannot start new task.\n" ); |
728 | return NULL; |
729 | } |
730 | |
731 | if (data_size > ISCSI_DEF_MAX_RECV_SEG_LEN) { |
732 | iscsi_conn_printk(KERN_ERR, conn, "Invalid buffer len of %u for login task. Max len is %u\n" , data_size, ISCSI_DEF_MAX_RECV_SEG_LEN); |
733 | return NULL; |
734 | } |
735 | |
736 | task = conn->login_task; |
737 | } else { |
738 | if (session->state != ISCSI_STATE_LOGGED_IN) |
739 | return NULL; |
740 | |
741 | if (data_size != 0) { |
742 | iscsi_conn_printk(KERN_ERR, conn, "Can not send data buffer of len %u for op 0x%x\n" , data_size, opcode); |
743 | return NULL; |
744 | } |
745 | |
746 | BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE); |
747 | BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED); |
748 | |
749 | if (!kfifo_out(&session->cmdpool.queue, |
750 | (void*)&task, sizeof(void*))) |
751 | return NULL; |
752 | } |
753 | /* |
754 | * released in complete pdu for task we expect a response for, and |
755 | * released by the lld when it has transmitted the task for |
756 | * pdus we do not expect a response for. |
757 | */ |
758 | refcount_set(r: &task->refcount, n: 1); |
759 | task->conn = conn; |
760 | task->sc = NULL; |
761 | INIT_LIST_HEAD(list: &task->running); |
762 | task->state = ISCSI_TASK_PENDING; |
763 | |
764 | if (data_size) { |
765 | memcpy(task->data, data, data_size); |
766 | task->data_count = data_size; |
767 | } else |
768 | task->data_count = 0; |
769 | |
770 | if (conn->session->tt->alloc_pdu) { |
771 | if (conn->session->tt->alloc_pdu(task, hdr->opcode)) { |
772 | iscsi_conn_printk(KERN_ERR, conn, "Could not allocate " |
773 | "pdu for mgmt task.\n" ); |
774 | goto free_task; |
775 | } |
776 | } |
777 | |
778 | itt = task->hdr->itt; |
779 | task->hdr_len = sizeof(struct iscsi_hdr); |
780 | memcpy(task->hdr, hdr, sizeof(struct iscsi_hdr)); |
781 | |
782 | if (hdr->itt != RESERVED_ITT) { |
783 | if (session->tt->parse_pdu_itt) |
784 | task->hdr->itt = itt; |
785 | else |
786 | task->hdr->itt = build_itt(task->itt, |
787 | task->conn->session->age); |
788 | } |
789 | |
790 | return task; |
791 | |
792 | free_task: |
793 | iscsi_put_task(task); |
794 | return NULL; |
795 | } |
796 | |
797 | /** |
798 | * iscsi_send_mgmt_task - Send task created with iscsi_alloc_mgmt_task. |
799 | * @task: iscsi task to send. |
800 | * |
801 | * On failure this returns a non-zero error code, and the driver must free |
802 | * the task with iscsi_put_task; |
803 | */ |
804 | static int iscsi_send_mgmt_task(struct iscsi_task *task) |
805 | { |
806 | struct iscsi_conn *conn = task->conn; |
807 | struct iscsi_session *session = conn->session; |
808 | struct iscsi_host *ihost = shost_priv(shost: conn->session->host); |
809 | int rc = 0; |
810 | |
811 | if (!ihost->workq) { |
812 | rc = iscsi_prep_mgmt_task(conn, task); |
813 | if (rc) |
814 | return rc; |
815 | |
816 | rc = session->tt->xmit_task(task); |
817 | if (rc) |
818 | return rc; |
819 | } else { |
820 | list_add_tail(new: &task->running, head: &conn->mgmtqueue); |
821 | iscsi_conn_queue_xmit(conn); |
822 | } |
823 | |
824 | return 0; |
825 | } |
826 | |
827 | static int __iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
828 | char *data, uint32_t data_size) |
829 | { |
830 | struct iscsi_task *task; |
831 | int rc; |
832 | |
833 | task = iscsi_alloc_mgmt_task(conn, hdr, data, data_size); |
834 | if (!task) |
835 | return -ENOMEM; |
836 | |
837 | rc = iscsi_send_mgmt_task(task); |
838 | if (rc) |
839 | iscsi_put_task(task); |
840 | return rc; |
841 | } |
842 | |
843 | int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr, |
844 | char *data, uint32_t data_size) |
845 | { |
846 | struct iscsi_conn *conn = cls_conn->dd_data; |
847 | struct iscsi_session *session = conn->session; |
848 | int err = 0; |
849 | |
850 | spin_lock_bh(lock: &session->frwd_lock); |
851 | if (__iscsi_conn_send_pdu(conn, hdr, data, data_size)) |
852 | err = -EPERM; |
853 | spin_unlock_bh(lock: &session->frwd_lock); |
854 | return err; |
855 | } |
856 | EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu); |
857 | |
858 | /** |
859 | * iscsi_scsi_cmd_rsp - SCSI Command Response processing |
860 | * @conn: iscsi connection |
861 | * @hdr: iscsi header |
862 | * @task: scsi command task |
863 | * @data: cmd data buffer |
864 | * @datalen: len of buffer |
865 | * |
866 | * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and |
867 | * then completes the command and task. called under back_lock |
868 | **/ |
869 | static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
870 | struct iscsi_task *task, char *data, |
871 | int datalen) |
872 | { |
873 | struct iscsi_scsi_rsp *rhdr = (struct iscsi_scsi_rsp *)hdr; |
874 | struct iscsi_session *session = conn->session; |
875 | struct scsi_cmnd *sc = task->sc; |
876 | |
877 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr); |
878 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; |
879 | |
880 | sc->result = (DID_OK << 16) | rhdr->cmd_status; |
881 | |
882 | if (task->protected) { |
883 | sector_t sector; |
884 | u8 ascq; |
885 | |
886 | /** |
887 | * Transports that didn't implement check_protection |
888 | * callback but still published T10-PI support to scsi-mid |
889 | * deserve this BUG_ON. |
890 | **/ |
891 | BUG_ON(!session->tt->check_protection); |
892 | |
893 | ascq = session->tt->check_protection(task, §or); |
894 | if (ascq) { |
895 | scsi_build_sense(scmd: sc, desc: 1, ILLEGAL_REQUEST, asc: 0x10, ascq); |
896 | scsi_set_sense_information(buf: sc->sense_buffer, |
897 | SCSI_SENSE_BUFFERSIZE, |
898 | info: sector); |
899 | goto out; |
900 | } |
901 | } |
902 | |
903 | if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) { |
904 | sc->result = DID_ERROR << 16; |
905 | goto out; |
906 | } |
907 | |
908 | if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) { |
909 | uint16_t senselen; |
910 | |
911 | if (datalen < 2) { |
912 | invalid_datalen: |
913 | iscsi_conn_printk(KERN_ERR, conn, |
914 | "Got CHECK_CONDITION but invalid data " |
915 | "buffer size of %d\n" , datalen); |
916 | sc->result = DID_BAD_TARGET << 16; |
917 | goto out; |
918 | } |
919 | |
920 | senselen = get_unaligned_be16(p: data); |
921 | if (datalen < senselen) |
922 | goto invalid_datalen; |
923 | |
924 | memcpy(sc->sense_buffer, data + 2, |
925 | min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE)); |
926 | ISCSI_DBG_SESSION(session, "copied %d bytes of sense\n" , |
927 | min_t(uint16_t, senselen, |
928 | SCSI_SENSE_BUFFERSIZE)); |
929 | } |
930 | |
931 | if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW | |
932 | ISCSI_FLAG_CMD_BIDI_OVERFLOW)) { |
933 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; |
934 | } |
935 | |
936 | if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW | |
937 | ISCSI_FLAG_CMD_OVERFLOW)) { |
938 | int res_count = be32_to_cpu(rhdr->residual_count); |
939 | |
940 | if (res_count > 0 && |
941 | (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || |
942 | res_count <= scsi_bufflen(cmd: sc))) |
943 | /* write side for bidi or uni-io set_resid */ |
944 | scsi_set_resid(cmd: sc, resid: res_count); |
945 | else |
946 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; |
947 | } |
948 | out: |
949 | ISCSI_DBG_SESSION(session, "cmd rsp done [sc %p res %d itt 0x%x]\n" , |
950 | sc, sc->result, task->itt); |
951 | conn->scsirsp_pdus_cnt++; |
952 | iscsi_complete_task(task, state: ISCSI_TASK_COMPLETED); |
953 | } |
954 | |
955 | /** |
956 | * iscsi_data_in_rsp - SCSI Data-In Response processing |
957 | * @conn: iscsi connection |
958 | * @hdr: iscsi pdu |
959 | * @task: scsi command task |
960 | * |
961 | * iscsi_data_in_rsp sets up the scsi_cmnd fields based on the data received |
962 | * then completes the command and task. called under back_lock |
963 | **/ |
964 | static void |
965 | iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
966 | struct iscsi_task *task) |
967 | { |
968 | struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)hdr; |
969 | struct scsi_cmnd *sc = task->sc; |
970 | |
971 | if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS)) |
972 | return; |
973 | |
974 | iscsi_update_cmdsn(conn->session, (struct iscsi_nopin *)hdr); |
975 | sc->result = (DID_OK << 16) | rhdr->cmd_status; |
976 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; |
977 | if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW | |
978 | ISCSI_FLAG_DATA_OVERFLOW)) { |
979 | int res_count = be32_to_cpu(rhdr->residual_count); |
980 | |
981 | if (res_count > 0 && |
982 | (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || |
983 | res_count <= sc->sdb.length)) |
984 | scsi_set_resid(cmd: sc, resid: res_count); |
985 | else |
986 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; |
987 | } |
988 | |
989 | ISCSI_DBG_SESSION(conn->session, "data in with status done " |
990 | "[sc %p res %d itt 0x%x]\n" , |
991 | sc, sc->result, task->itt); |
992 | conn->scsirsp_pdus_cnt++; |
993 | iscsi_complete_task(task, state: ISCSI_TASK_COMPLETED); |
994 | } |
995 | |
996 | static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr) |
997 | { |
998 | struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr; |
999 | struct iscsi_session *session = conn->session; |
1000 | |
1001 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; |
1002 | conn->tmfrsp_pdus_cnt++; |
1003 | |
1004 | if (session->tmf_state != TMF_QUEUED) |
1005 | return; |
1006 | |
1007 | if (tmf->response == ISCSI_TMF_RSP_COMPLETE) |
1008 | session->tmf_state = TMF_SUCCESS; |
1009 | else if (tmf->response == ISCSI_TMF_RSP_NO_TASK) |
1010 | session->tmf_state = TMF_NOT_FOUND; |
1011 | else |
1012 | session->tmf_state = TMF_FAILED; |
1013 | wake_up(&session->ehwait); |
1014 | } |
1015 | |
1016 | static int iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr) |
1017 | { |
1018 | struct iscsi_nopout hdr; |
1019 | struct iscsi_task *task; |
1020 | |
1021 | if (!rhdr) { |
1022 | if (READ_ONCE(conn->ping_task)) |
1023 | return -EINVAL; |
1024 | } |
1025 | |
1026 | memset(&hdr, 0, sizeof(struct iscsi_nopout)); |
1027 | hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE; |
1028 | hdr.flags = ISCSI_FLAG_CMD_FINAL; |
1029 | |
1030 | if (rhdr) { |
1031 | hdr.lun = rhdr->lun; |
1032 | hdr.ttt = rhdr->ttt; |
1033 | hdr.itt = RESERVED_ITT; |
1034 | } else |
1035 | hdr.ttt = RESERVED_ITT; |
1036 | |
1037 | task = iscsi_alloc_mgmt_task(conn, hdr: (struct iscsi_hdr *)&hdr, NULL, data_size: 0); |
1038 | if (!task) |
1039 | return -ENOMEM; |
1040 | |
1041 | if (!rhdr) |
1042 | WRITE_ONCE(conn->ping_task, task); |
1043 | |
1044 | if (iscsi_send_mgmt_task(task)) { |
1045 | if (!rhdr) |
1046 | WRITE_ONCE(conn->ping_task, NULL); |
1047 | iscsi_put_task(task); |
1048 | |
1049 | iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n" ); |
1050 | return -EIO; |
1051 | } else if (!rhdr) { |
1052 | /* only track our nops */ |
1053 | conn->last_ping = jiffies; |
1054 | } |
1055 | |
1056 | return 0; |
1057 | } |
1058 | |
1059 | /** |
1060 | * iscsi_nop_out_rsp - SCSI NOP Response processing |
1061 | * @task: scsi command task |
1062 | * @nop: the nop structure |
1063 | * @data: where to put the data |
1064 | * @datalen: length of data |
1065 | * |
1066 | * iscsi_nop_out_rsp handles nop response from use or |
1067 | * from user space. called under back_lock |
1068 | **/ |
1069 | static int iscsi_nop_out_rsp(struct iscsi_task *task, |
1070 | struct iscsi_nopin *nop, char *data, int datalen) |
1071 | { |
1072 | struct iscsi_conn *conn = task->conn; |
1073 | int rc = 0; |
1074 | |
1075 | if (READ_ONCE(conn->ping_task) != task) { |
1076 | /* |
1077 | * If this is not in response to one of our |
1078 | * nops then it must be from userspace. |
1079 | */ |
1080 | if (iscsi_recv_pdu(conn: conn->cls_conn, hdr: (struct iscsi_hdr *)nop, |
1081 | data, data_size: datalen)) |
1082 | rc = ISCSI_ERR_CONN_FAILED; |
1083 | } else |
1084 | mod_timer(timer: &conn->transport_timer, expires: jiffies + conn->recv_timeout); |
1085 | iscsi_complete_task(task, state: ISCSI_TASK_COMPLETED); |
1086 | return rc; |
1087 | } |
1088 | |
1089 | static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
1090 | char *data, int datalen) |
1091 | { |
1092 | struct iscsi_reject *reject = (struct iscsi_reject *)hdr; |
1093 | struct iscsi_hdr rejected_pdu; |
1094 | int opcode, rc = 0; |
1095 | |
1096 | conn->exp_statsn = be32_to_cpu(reject->statsn) + 1; |
1097 | |
1098 | if (ntoh24(reject->dlength) > datalen || |
1099 | ntoh24(reject->dlength) < sizeof(struct iscsi_hdr)) { |
1100 | iscsi_conn_printk(KERN_ERR, conn, "Cannot handle rejected " |
1101 | "pdu. Invalid data length (pdu dlength " |
1102 | "%u, datalen %d\n" , ntoh24(reject->dlength), |
1103 | datalen); |
1104 | return ISCSI_ERR_PROTO; |
1105 | } |
1106 | memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr)); |
1107 | opcode = rejected_pdu.opcode & ISCSI_OPCODE_MASK; |
1108 | |
1109 | switch (reject->reason) { |
1110 | case ISCSI_REASON_DATA_DIGEST_ERROR: |
1111 | iscsi_conn_printk(KERN_ERR, conn, |
1112 | "pdu (op 0x%x itt 0x%x) rejected " |
1113 | "due to DataDigest error.\n" , |
1114 | opcode, rejected_pdu.itt); |
1115 | break; |
1116 | case ISCSI_REASON_IMM_CMD_REJECT: |
1117 | iscsi_conn_printk(KERN_ERR, conn, |
1118 | "pdu (op 0x%x itt 0x%x) rejected. Too many " |
1119 | "immediate commands.\n" , |
1120 | opcode, rejected_pdu.itt); |
1121 | /* |
1122 | * We only send one TMF at a time so if the target could not |
1123 | * handle it, then it should get fixed (RFC mandates that |
1124 | * a target can handle one immediate TMF per conn). |
1125 | * |
1126 | * For nops-outs, we could have sent more than one if |
1127 | * the target is sending us lots of nop-ins |
1128 | */ |
1129 | if (opcode != ISCSI_OP_NOOP_OUT) |
1130 | return 0; |
1131 | |
1132 | if (rejected_pdu.itt == cpu_to_be32(ISCSI_RESERVED_TAG)) { |
1133 | /* |
1134 | * nop-out in response to target's nop-out rejected. |
1135 | * Just resend. |
1136 | */ |
1137 | /* In RX path we are under back lock */ |
1138 | spin_unlock(lock: &conn->session->back_lock); |
1139 | spin_lock(lock: &conn->session->frwd_lock); |
1140 | iscsi_send_nopout(conn, |
1141 | rhdr: (struct iscsi_nopin*)&rejected_pdu); |
1142 | spin_unlock(lock: &conn->session->frwd_lock); |
1143 | spin_lock(lock: &conn->session->back_lock); |
1144 | } else { |
1145 | struct iscsi_task *task; |
1146 | /* |
1147 | * Our nop as ping got dropped. We know the target |
1148 | * and transport are ok so just clean up |
1149 | */ |
1150 | task = iscsi_itt_to_task(conn, rejected_pdu.itt); |
1151 | if (!task) { |
1152 | iscsi_conn_printk(KERN_ERR, conn, |
1153 | "Invalid pdu reject. Could " |
1154 | "not lookup rejected task.\n" ); |
1155 | rc = ISCSI_ERR_BAD_ITT; |
1156 | } else |
1157 | rc = iscsi_nop_out_rsp(task, |
1158 | nop: (struct iscsi_nopin*)&rejected_pdu, |
1159 | NULL, datalen: 0); |
1160 | } |
1161 | break; |
1162 | default: |
1163 | iscsi_conn_printk(KERN_ERR, conn, |
1164 | "pdu (op 0x%x itt 0x%x) rejected. Reason " |
1165 | "code 0x%x\n" , rejected_pdu.opcode, |
1166 | rejected_pdu.itt, reject->reason); |
1167 | break; |
1168 | } |
1169 | return rc; |
1170 | } |
1171 | |
1172 | /** |
1173 | * iscsi_itt_to_task - look up task by itt |
1174 | * @conn: iscsi connection |
1175 | * @itt: itt |
1176 | * |
1177 | * This should be used for mgmt tasks like login and nops, or if |
1178 | * the LDD's itt space does not include the session age. |
1179 | * |
1180 | * The session back_lock must be held. |
1181 | */ |
1182 | struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *conn, itt_t itt) |
1183 | { |
1184 | struct iscsi_session *session = conn->session; |
1185 | int i; |
1186 | |
1187 | if (itt == RESERVED_ITT) |
1188 | return NULL; |
1189 | |
1190 | if (session->tt->parse_pdu_itt) |
1191 | session->tt->parse_pdu_itt(conn, itt, &i, NULL); |
1192 | else |
1193 | i = get_itt(itt); |
1194 | if (i >= session->cmds_max) |
1195 | return NULL; |
1196 | |
1197 | return session->cmds[i]; |
1198 | } |
1199 | EXPORT_SYMBOL_GPL(iscsi_itt_to_task); |
1200 | |
1201 | /** |
1202 | * __iscsi_complete_pdu - complete pdu |
1203 | * @conn: iscsi conn |
1204 | * @hdr: iscsi header |
1205 | * @data: data buffer |
1206 | * @datalen: len of data buffer |
1207 | * |
1208 | * Completes pdu processing by freeing any resources allocated at |
1209 | * queuecommand or send generic. session back_lock must be held and verify |
1210 | * itt must have been called. |
1211 | */ |
1212 | int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
1213 | char *data, int datalen) |
1214 | { |
1215 | struct iscsi_session *session = conn->session; |
1216 | int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0; |
1217 | struct iscsi_task *task; |
1218 | uint32_t itt; |
1219 | |
1220 | conn->last_recv = jiffies; |
1221 | rc = iscsi_verify_itt(conn, hdr->itt); |
1222 | if (rc) |
1223 | return rc; |
1224 | |
1225 | if (hdr->itt != RESERVED_ITT) |
1226 | itt = get_itt(hdr->itt); |
1227 | else |
1228 | itt = ~0U; |
1229 | |
1230 | ISCSI_DBG_SESSION(session, "[op 0x%x cid %d itt 0x%x len %d]\n" , |
1231 | opcode, conn->id, itt, datalen); |
1232 | |
1233 | if (itt == ~0U) { |
1234 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); |
1235 | |
1236 | switch(opcode) { |
1237 | case ISCSI_OP_NOOP_IN: |
1238 | if (datalen) { |
1239 | rc = ISCSI_ERR_PROTO; |
1240 | break; |
1241 | } |
1242 | |
1243 | if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG)) |
1244 | break; |
1245 | |
1246 | /* In RX path we are under back lock */ |
1247 | spin_unlock(lock: &session->back_lock); |
1248 | spin_lock(lock: &session->frwd_lock); |
1249 | iscsi_send_nopout(conn, rhdr: (struct iscsi_nopin*)hdr); |
1250 | spin_unlock(lock: &session->frwd_lock); |
1251 | spin_lock(lock: &session->back_lock); |
1252 | break; |
1253 | case ISCSI_OP_REJECT: |
1254 | rc = iscsi_handle_reject(conn, hdr, data, datalen); |
1255 | break; |
1256 | case ISCSI_OP_ASYNC_EVENT: |
1257 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; |
1258 | if (iscsi_recv_pdu(conn: conn->cls_conn, hdr, data, data_size: datalen)) |
1259 | rc = ISCSI_ERR_CONN_FAILED; |
1260 | break; |
1261 | default: |
1262 | rc = ISCSI_ERR_BAD_OPCODE; |
1263 | break; |
1264 | } |
1265 | goto out; |
1266 | } |
1267 | |
1268 | switch(opcode) { |
1269 | case ISCSI_OP_SCSI_CMD_RSP: |
1270 | case ISCSI_OP_SCSI_DATA_IN: |
1271 | task = iscsi_itt_to_ctask(conn, hdr->itt); |
1272 | if (!task) |
1273 | return ISCSI_ERR_BAD_ITT; |
1274 | task->last_xfer = jiffies; |
1275 | break; |
1276 | case ISCSI_OP_R2T: |
1277 | /* |
1278 | * LLD handles R2Ts if they need to. |
1279 | */ |
1280 | return 0; |
1281 | case ISCSI_OP_LOGOUT_RSP: |
1282 | case ISCSI_OP_LOGIN_RSP: |
1283 | case ISCSI_OP_TEXT_RSP: |
1284 | case ISCSI_OP_SCSI_TMFUNC_RSP: |
1285 | case ISCSI_OP_NOOP_IN: |
1286 | task = iscsi_itt_to_task(conn, hdr->itt); |
1287 | if (!task) |
1288 | return ISCSI_ERR_BAD_ITT; |
1289 | break; |
1290 | default: |
1291 | return ISCSI_ERR_BAD_OPCODE; |
1292 | } |
1293 | |
1294 | switch(opcode) { |
1295 | case ISCSI_OP_SCSI_CMD_RSP: |
1296 | iscsi_scsi_cmd_rsp(conn, hdr, task, data, datalen); |
1297 | break; |
1298 | case ISCSI_OP_SCSI_DATA_IN: |
1299 | iscsi_data_in_rsp(conn, hdr, task); |
1300 | break; |
1301 | case ISCSI_OP_LOGOUT_RSP: |
1302 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); |
1303 | if (datalen) { |
1304 | rc = ISCSI_ERR_PROTO; |
1305 | break; |
1306 | } |
1307 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; |
1308 | goto recv_pdu; |
1309 | case ISCSI_OP_LOGIN_RSP: |
1310 | case ISCSI_OP_TEXT_RSP: |
1311 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); |
1312 | /* |
1313 | * login related PDU's exp_statsn is handled in |
1314 | * userspace |
1315 | */ |
1316 | goto recv_pdu; |
1317 | case ISCSI_OP_SCSI_TMFUNC_RSP: |
1318 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); |
1319 | if (datalen) { |
1320 | rc = ISCSI_ERR_PROTO; |
1321 | break; |
1322 | } |
1323 | |
1324 | iscsi_tmf_rsp(conn, hdr); |
1325 | iscsi_complete_task(task, state: ISCSI_TASK_COMPLETED); |
1326 | break; |
1327 | case ISCSI_OP_NOOP_IN: |
1328 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); |
1329 | if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) { |
1330 | rc = ISCSI_ERR_PROTO; |
1331 | break; |
1332 | } |
1333 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; |
1334 | |
1335 | rc = iscsi_nop_out_rsp(task, nop: (struct iscsi_nopin*)hdr, |
1336 | data, datalen); |
1337 | break; |
1338 | default: |
1339 | rc = ISCSI_ERR_BAD_OPCODE; |
1340 | break; |
1341 | } |
1342 | |
1343 | out: |
1344 | return rc; |
1345 | recv_pdu: |
1346 | if (iscsi_recv_pdu(conn: conn->cls_conn, hdr, data, data_size: datalen)) |
1347 | rc = ISCSI_ERR_CONN_FAILED; |
1348 | iscsi_complete_task(task, state: ISCSI_TASK_COMPLETED); |
1349 | return rc; |
1350 | } |
1351 | EXPORT_SYMBOL_GPL(__iscsi_complete_pdu); |
1352 | |
1353 | int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
1354 | char *data, int datalen) |
1355 | { |
1356 | int rc; |
1357 | |
1358 | spin_lock(lock: &conn->session->back_lock); |
1359 | rc = __iscsi_complete_pdu(conn, hdr, data, datalen); |
1360 | spin_unlock(lock: &conn->session->back_lock); |
1361 | return rc; |
1362 | } |
1363 | EXPORT_SYMBOL_GPL(iscsi_complete_pdu); |
1364 | |
1365 | int iscsi_verify_itt(struct iscsi_conn *conn, itt_t itt) |
1366 | { |
1367 | struct iscsi_session *session = conn->session; |
1368 | int age = 0, i = 0; |
1369 | |
1370 | if (itt == RESERVED_ITT) |
1371 | return 0; |
1372 | |
1373 | if (session->tt->parse_pdu_itt) |
1374 | session->tt->parse_pdu_itt(conn, itt, &i, &age); |
1375 | else { |
1376 | i = get_itt(itt); |
1377 | age = ((__force u32)itt >> ISCSI_AGE_SHIFT) & ISCSI_AGE_MASK; |
1378 | } |
1379 | |
1380 | if (age != session->age) { |
1381 | iscsi_conn_printk(KERN_ERR, conn, |
1382 | "received itt %x expected session age (%x)\n" , |
1383 | (__force u32)itt, session->age); |
1384 | return ISCSI_ERR_BAD_ITT; |
1385 | } |
1386 | |
1387 | if (i >= session->cmds_max) { |
1388 | iscsi_conn_printk(KERN_ERR, conn, |
1389 | "received invalid itt index %u (max cmds " |
1390 | "%u.\n" , i, session->cmds_max); |
1391 | return ISCSI_ERR_BAD_ITT; |
1392 | } |
1393 | return 0; |
1394 | } |
1395 | EXPORT_SYMBOL_GPL(iscsi_verify_itt); |
1396 | |
1397 | /** |
1398 | * iscsi_itt_to_ctask - look up ctask by itt |
1399 | * @conn: iscsi connection |
1400 | * @itt: itt |
1401 | * |
1402 | * This should be used for cmd tasks. |
1403 | * |
1404 | * The session back_lock must be held. |
1405 | */ |
1406 | struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *conn, itt_t itt) |
1407 | { |
1408 | struct iscsi_task *task; |
1409 | |
1410 | if (iscsi_verify_itt(conn, itt)) |
1411 | return NULL; |
1412 | |
1413 | task = iscsi_itt_to_task(conn, itt); |
1414 | if (!task || !task->sc) |
1415 | return NULL; |
1416 | |
1417 | if (iscsi_cmd(cmd: task->sc)->age != conn->session->age) { |
1418 | iscsi_session_printk(KERN_ERR, conn->session, |
1419 | "task's session age %d, expected %d\n" , |
1420 | iscsi_cmd(task->sc)->age, conn->session->age); |
1421 | return NULL; |
1422 | } |
1423 | |
1424 | return task; |
1425 | } |
1426 | EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask); |
1427 | |
1428 | void iscsi_session_failure(struct iscsi_session *session, |
1429 | enum iscsi_err err) |
1430 | { |
1431 | struct iscsi_conn *conn; |
1432 | |
1433 | spin_lock_bh(lock: &session->frwd_lock); |
1434 | conn = session->leadconn; |
1435 | if (session->state == ISCSI_STATE_TERMINATE || !conn) { |
1436 | spin_unlock_bh(lock: &session->frwd_lock); |
1437 | return; |
1438 | } |
1439 | |
1440 | iscsi_get_conn(conn: conn->cls_conn); |
1441 | spin_unlock_bh(lock: &session->frwd_lock); |
1442 | /* |
1443 | * if the host is being removed bypass the connection |
1444 | * recovery initialization because we are going to kill |
1445 | * the session. |
1446 | */ |
1447 | if (err == ISCSI_ERR_INVALID_HOST) |
1448 | iscsi_conn_error_event(conn: conn->cls_conn, error: err); |
1449 | else |
1450 | iscsi_conn_failure(conn, err); |
1451 | iscsi_put_conn(conn: conn->cls_conn); |
1452 | } |
1453 | EXPORT_SYMBOL_GPL(iscsi_session_failure); |
1454 | |
1455 | static bool iscsi_set_conn_failed(struct iscsi_conn *conn) |
1456 | { |
1457 | struct iscsi_session *session = conn->session; |
1458 | |
1459 | if (session->state == ISCSI_STATE_FAILED) |
1460 | return false; |
1461 | |
1462 | if (conn->stop_stage == 0) |
1463 | session->state = ISCSI_STATE_FAILED; |
1464 | |
1465 | set_bit(ISCSI_CONN_FLAG_SUSPEND_TX, addr: &conn->flags); |
1466 | set_bit(ISCSI_CONN_FLAG_SUSPEND_RX, addr: &conn->flags); |
1467 | return true; |
1468 | } |
1469 | |
1470 | void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err) |
1471 | { |
1472 | struct iscsi_session *session = conn->session; |
1473 | bool needs_evt; |
1474 | |
1475 | spin_lock_bh(lock: &session->frwd_lock); |
1476 | needs_evt = iscsi_set_conn_failed(conn); |
1477 | spin_unlock_bh(lock: &session->frwd_lock); |
1478 | |
1479 | if (needs_evt) |
1480 | iscsi_conn_error_event(conn: conn->cls_conn, error: err); |
1481 | } |
1482 | EXPORT_SYMBOL_GPL(iscsi_conn_failure); |
1483 | |
1484 | static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn) |
1485 | { |
1486 | struct iscsi_session *session = conn->session; |
1487 | |
1488 | /* |
1489 | * Check for iSCSI window and take care of CmdSN wrap-around |
1490 | */ |
1491 | if (!iscsi_sna_lte(n1: session->queued_cmdsn, n2: session->max_cmdsn)) { |
1492 | ISCSI_DBG_SESSION(session, "iSCSI CmdSN closed. ExpCmdSn " |
1493 | "%u MaxCmdSN %u CmdSN %u/%u\n" , |
1494 | session->exp_cmdsn, session->max_cmdsn, |
1495 | session->cmdsn, session->queued_cmdsn); |
1496 | return -ENOSPC; |
1497 | } |
1498 | return 0; |
1499 | } |
1500 | |
1501 | static int iscsi_xmit_task(struct iscsi_conn *conn, struct iscsi_task *task, |
1502 | bool was_requeue) |
1503 | { |
1504 | int rc; |
1505 | |
1506 | if (!conn->task) { |
1507 | /* |
1508 | * Take a ref so we can access it after xmit_task(). |
1509 | * |
1510 | * This should never fail because the failure paths will have |
1511 | * stopped the xmit thread. |
1512 | */ |
1513 | if (!iscsi_get_task(task)) { |
1514 | WARN_ON_ONCE(1); |
1515 | return 0; |
1516 | } |
1517 | } else { |
1518 | /* Already have a ref from when we failed to send it last call */ |
1519 | conn->task = NULL; |
1520 | } |
1521 | |
1522 | /* |
1523 | * If this was a requeue for a R2T we have an extra ref on the task in |
1524 | * case a bad target sends a cmd rsp before we have handled the task. |
1525 | */ |
1526 | if (was_requeue) |
1527 | iscsi_put_task(task); |
1528 | |
1529 | /* |
1530 | * Do this after dropping the extra ref because if this was a requeue |
1531 | * it's removed from that list and cleanup_queued_task would miss it. |
1532 | */ |
1533 | if (test_bit(ISCSI_CONN_FLAG_SUSPEND_TX, &conn->flags)) { |
1534 | /* |
1535 | * Save the task and ref in case we weren't cleaning up this |
1536 | * task and get woken up again. |
1537 | */ |
1538 | conn->task = task; |
1539 | return -ENODATA; |
1540 | } |
1541 | |
1542 | spin_unlock_bh(lock: &conn->session->frwd_lock); |
1543 | rc = conn->session->tt->xmit_task(task); |
1544 | spin_lock_bh(lock: &conn->session->frwd_lock); |
1545 | if (!rc) { |
1546 | /* done with this task */ |
1547 | task->last_xfer = jiffies; |
1548 | } else { |
1549 | /* |
1550 | * get an extra ref that is released next time we access it |
1551 | * as conn->task above. |
1552 | */ |
1553 | iscsi_get_task(task); |
1554 | conn->task = task; |
1555 | } |
1556 | |
1557 | iscsi_put_task(task); |
1558 | return rc; |
1559 | } |
1560 | |
1561 | /** |
1562 | * iscsi_requeue_task - requeue task to run from session workqueue |
1563 | * @task: task to requeue |
1564 | * |
1565 | * Callers must have taken a ref to the task that is going to be requeued. |
1566 | */ |
1567 | void iscsi_requeue_task(struct iscsi_task *task) |
1568 | { |
1569 | struct iscsi_conn *conn = task->conn; |
1570 | |
1571 | /* |
1572 | * this may be on the requeue list already if the xmit_task callout |
1573 | * is handling the r2ts while we are adding new ones |
1574 | */ |
1575 | spin_lock_bh(lock: &conn->session->frwd_lock); |
1576 | if (list_empty(head: &task->running)) { |
1577 | list_add_tail(new: &task->running, head: &conn->requeue); |
1578 | } else { |
1579 | /* |
1580 | * Don't need the extra ref since it's already requeued and |
1581 | * has a ref. |
1582 | */ |
1583 | iscsi_put_task(task); |
1584 | } |
1585 | iscsi_conn_queue_xmit(conn); |
1586 | spin_unlock_bh(lock: &conn->session->frwd_lock); |
1587 | } |
1588 | EXPORT_SYMBOL_GPL(iscsi_requeue_task); |
1589 | |
1590 | /** |
1591 | * iscsi_data_xmit - xmit any command into the scheduled connection |
1592 | * @conn: iscsi connection |
1593 | * |
1594 | * Notes: |
1595 | * The function can return -EAGAIN in which case the caller must |
1596 | * re-schedule it again later or recover. '0' return code means |
1597 | * successful xmit. |
1598 | **/ |
1599 | static int iscsi_data_xmit(struct iscsi_conn *conn) |
1600 | { |
1601 | struct iscsi_task *task; |
1602 | int rc = 0; |
1603 | |
1604 | spin_lock_bh(lock: &conn->session->frwd_lock); |
1605 | if (test_bit(ISCSI_CONN_FLAG_SUSPEND_TX, &conn->flags)) { |
1606 | ISCSI_DBG_SESSION(conn->session, "Tx suspended!\n" ); |
1607 | spin_unlock_bh(lock: &conn->session->frwd_lock); |
1608 | return -ENODATA; |
1609 | } |
1610 | |
1611 | if (conn->task) { |
1612 | rc = iscsi_xmit_task(conn, task: conn->task, was_requeue: false); |
1613 | if (rc) |
1614 | goto done; |
1615 | } |
1616 | |
1617 | /* |
1618 | * process mgmt pdus like nops before commands since we should |
1619 | * only have one nop-out as a ping from us and targets should not |
1620 | * overflow us with nop-ins |
1621 | */ |
1622 | check_mgmt: |
1623 | while (!list_empty(head: &conn->mgmtqueue)) { |
1624 | task = list_entry(conn->mgmtqueue.next, struct iscsi_task, |
1625 | running); |
1626 | list_del_init(entry: &task->running); |
1627 | if (iscsi_prep_mgmt_task(conn, task)) { |
1628 | /* regular RX path uses back_lock */ |
1629 | spin_lock_bh(lock: &conn->session->back_lock); |
1630 | __iscsi_put_task(task); |
1631 | spin_unlock_bh(lock: &conn->session->back_lock); |
1632 | continue; |
1633 | } |
1634 | rc = iscsi_xmit_task(conn, task, was_requeue: false); |
1635 | if (rc) |
1636 | goto done; |
1637 | } |
1638 | |
1639 | check_requeue: |
1640 | while (!list_empty(head: &conn->requeue)) { |
1641 | /* |
1642 | * we always do fastlogout - conn stop code will clean up. |
1643 | */ |
1644 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) |
1645 | break; |
1646 | |
1647 | task = list_entry(conn->requeue.next, struct iscsi_task, |
1648 | running); |
1649 | |
1650 | if (iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_DATA_OUT)) |
1651 | break; |
1652 | |
1653 | list_del_init(entry: &task->running); |
1654 | rc = iscsi_xmit_task(conn, task, was_requeue: true); |
1655 | if (rc) |
1656 | goto done; |
1657 | if (!list_empty(head: &conn->mgmtqueue)) |
1658 | goto check_mgmt; |
1659 | } |
1660 | |
1661 | /* process pending command queue */ |
1662 | while (!list_empty(head: &conn->cmdqueue)) { |
1663 | task = list_entry(conn->cmdqueue.next, struct iscsi_task, |
1664 | running); |
1665 | list_del_init(entry: &task->running); |
1666 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) { |
1667 | fail_scsi_task(task, err: DID_IMM_RETRY); |
1668 | continue; |
1669 | } |
1670 | rc = iscsi_prep_scsi_cmd_pdu(task); |
1671 | if (rc) { |
1672 | if (rc == -ENOMEM || rc == -EACCES) |
1673 | fail_scsi_task(task, err: DID_IMM_RETRY); |
1674 | else |
1675 | fail_scsi_task(task, err: DID_ABORT); |
1676 | continue; |
1677 | } |
1678 | rc = iscsi_xmit_task(conn, task, was_requeue: false); |
1679 | if (rc) |
1680 | goto done; |
1681 | /* |
1682 | * we could continuously get new task requests so |
1683 | * we need to check the mgmt queue for nops that need to |
1684 | * be sent to aviod starvation |
1685 | */ |
1686 | if (!list_empty(head: &conn->mgmtqueue)) |
1687 | goto check_mgmt; |
1688 | if (!list_empty(head: &conn->requeue)) |
1689 | goto check_requeue; |
1690 | } |
1691 | |
1692 | spin_unlock_bh(lock: &conn->session->frwd_lock); |
1693 | return -ENODATA; |
1694 | |
1695 | done: |
1696 | spin_unlock_bh(lock: &conn->session->frwd_lock); |
1697 | return rc; |
1698 | } |
1699 | |
1700 | static void iscsi_xmitworker(struct work_struct *work) |
1701 | { |
1702 | struct iscsi_conn *conn = |
1703 | container_of(work, struct iscsi_conn, xmitwork); |
1704 | int rc; |
1705 | /* |
1706 | * serialize Xmit worker on a per-connection basis. |
1707 | */ |
1708 | do { |
1709 | rc = iscsi_data_xmit(conn); |
1710 | } while (rc >= 0 || rc == -EAGAIN); |
1711 | } |
1712 | |
1713 | static inline struct iscsi_task *iscsi_alloc_task(struct iscsi_conn *conn, |
1714 | struct scsi_cmnd *sc) |
1715 | { |
1716 | struct iscsi_task *task; |
1717 | |
1718 | if (!kfifo_out(&conn->session->cmdpool.queue, |
1719 | (void *) &task, sizeof(void *))) |
1720 | return NULL; |
1721 | |
1722 | iscsi_cmd(cmd: sc)->age = conn->session->age; |
1723 | iscsi_cmd(cmd: sc)->task = task; |
1724 | |
1725 | refcount_set(r: &task->refcount, n: 1); |
1726 | task->state = ISCSI_TASK_PENDING; |
1727 | task->conn = conn; |
1728 | task->sc = sc; |
1729 | task->have_checked_conn = false; |
1730 | task->last_timeout = jiffies; |
1731 | task->last_xfer = jiffies; |
1732 | task->protected = false; |
1733 | INIT_LIST_HEAD(list: &task->running); |
1734 | return task; |
1735 | } |
1736 | |
1737 | enum { |
1738 | FAILURE_BAD_HOST = 1, |
1739 | FAILURE_SESSION_FAILED, |
1740 | FAILURE_SESSION_FREED, |
1741 | FAILURE_WINDOW_CLOSED, |
1742 | FAILURE_OOM, |
1743 | FAILURE_SESSION_TERMINATE, |
1744 | FAILURE_SESSION_IN_RECOVERY, |
1745 | FAILURE_SESSION_RECOVERY_TIMEOUT, |
1746 | FAILURE_SESSION_LOGGING_OUT, |
1747 | FAILURE_SESSION_NOT_READY, |
1748 | }; |
1749 | |
1750 | int iscsi_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc) |
1751 | { |
1752 | struct iscsi_cls_session *cls_session; |
1753 | struct iscsi_host *ihost; |
1754 | int reason = 0; |
1755 | struct iscsi_session *session; |
1756 | struct iscsi_conn *conn; |
1757 | struct iscsi_task *task = NULL; |
1758 | |
1759 | sc->result = 0; |
1760 | iscsi_cmd(cmd: sc)->task = NULL; |
1761 | |
1762 | ihost = shost_priv(shost: host); |
1763 | |
1764 | cls_session = starget_to_session(scsi_target(sc->device)); |
1765 | session = cls_session->dd_data; |
1766 | spin_lock_bh(lock: &session->frwd_lock); |
1767 | |
1768 | reason = iscsi_session_chkready(session: cls_session); |
1769 | if (reason) { |
1770 | sc->result = reason; |
1771 | goto fault; |
1772 | } |
1773 | |
1774 | if (session->state != ISCSI_STATE_LOGGED_IN) { |
1775 | /* |
1776 | * to handle the race between when we set the recovery state |
1777 | * and block the session we requeue here (commands could |
1778 | * be entering our queuecommand while a block is starting |
1779 | * up because the block code is not locked) |
1780 | */ |
1781 | switch (session->state) { |
1782 | case ISCSI_STATE_FAILED: |
1783 | /* |
1784 | * cmds should fail during shutdown, if the session |
1785 | * state is bad, allowing completion to happen |
1786 | */ |
1787 | if (unlikely(system_state != SYSTEM_RUNNING)) { |
1788 | reason = FAILURE_SESSION_FAILED; |
1789 | sc->result = DID_NO_CONNECT << 16; |
1790 | break; |
1791 | } |
1792 | fallthrough; |
1793 | case ISCSI_STATE_IN_RECOVERY: |
1794 | reason = FAILURE_SESSION_IN_RECOVERY; |
1795 | sc->result = DID_IMM_RETRY << 16; |
1796 | break; |
1797 | case ISCSI_STATE_LOGGING_OUT: |
1798 | reason = FAILURE_SESSION_LOGGING_OUT; |
1799 | sc->result = DID_IMM_RETRY << 16; |
1800 | break; |
1801 | case ISCSI_STATE_RECOVERY_FAILED: |
1802 | reason = FAILURE_SESSION_RECOVERY_TIMEOUT; |
1803 | sc->result = DID_TRANSPORT_FAILFAST << 16; |
1804 | break; |
1805 | case ISCSI_STATE_TERMINATE: |
1806 | reason = FAILURE_SESSION_TERMINATE; |
1807 | sc->result = DID_NO_CONNECT << 16; |
1808 | break; |
1809 | default: |
1810 | reason = FAILURE_SESSION_FREED; |
1811 | sc->result = DID_NO_CONNECT << 16; |
1812 | } |
1813 | goto fault; |
1814 | } |
1815 | |
1816 | conn = session->leadconn; |
1817 | if (!conn) { |
1818 | reason = FAILURE_SESSION_FREED; |
1819 | sc->result = DID_NO_CONNECT << 16; |
1820 | goto fault; |
1821 | } |
1822 | |
1823 | if (test_bit(ISCSI_CONN_FLAG_SUSPEND_TX, &conn->flags)) { |
1824 | reason = FAILURE_SESSION_IN_RECOVERY; |
1825 | sc->result = DID_REQUEUE << 16; |
1826 | goto fault; |
1827 | } |
1828 | |
1829 | if (iscsi_check_cmdsn_window_closed(conn)) { |
1830 | reason = FAILURE_WINDOW_CLOSED; |
1831 | goto reject; |
1832 | } |
1833 | |
1834 | task = iscsi_alloc_task(conn, sc); |
1835 | if (!task) { |
1836 | reason = FAILURE_OOM; |
1837 | goto reject; |
1838 | } |
1839 | |
1840 | if (!ihost->workq) { |
1841 | reason = iscsi_prep_scsi_cmd_pdu(task); |
1842 | if (reason) { |
1843 | if (reason == -ENOMEM || reason == -EACCES) { |
1844 | reason = FAILURE_OOM; |
1845 | goto prepd_reject; |
1846 | } else { |
1847 | sc->result = DID_ABORT << 16; |
1848 | goto prepd_fault; |
1849 | } |
1850 | } |
1851 | if (session->tt->xmit_task(task)) { |
1852 | session->cmdsn--; |
1853 | reason = FAILURE_SESSION_NOT_READY; |
1854 | goto prepd_reject; |
1855 | } |
1856 | } else { |
1857 | list_add_tail(new: &task->running, head: &conn->cmdqueue); |
1858 | iscsi_conn_queue_xmit(conn); |
1859 | } |
1860 | |
1861 | session->queued_cmdsn++; |
1862 | spin_unlock_bh(lock: &session->frwd_lock); |
1863 | return 0; |
1864 | |
1865 | prepd_reject: |
1866 | spin_lock_bh(lock: &session->back_lock); |
1867 | iscsi_complete_task(task, state: ISCSI_TASK_REQUEUE_SCSIQ); |
1868 | spin_unlock_bh(lock: &session->back_lock); |
1869 | reject: |
1870 | spin_unlock_bh(lock: &session->frwd_lock); |
1871 | ISCSI_DBG_SESSION(session, "cmd 0x%x rejected (%d)\n" , |
1872 | sc->cmnd[0], reason); |
1873 | return SCSI_MLQUEUE_TARGET_BUSY; |
1874 | |
1875 | prepd_fault: |
1876 | spin_lock_bh(lock: &session->back_lock); |
1877 | iscsi_complete_task(task, state: ISCSI_TASK_REQUEUE_SCSIQ); |
1878 | spin_unlock_bh(lock: &session->back_lock); |
1879 | fault: |
1880 | spin_unlock_bh(lock: &session->frwd_lock); |
1881 | ISCSI_DBG_SESSION(session, "iscsi: cmd 0x%x is not queued (%d)\n" , |
1882 | sc->cmnd[0], reason); |
1883 | scsi_set_resid(cmd: sc, resid: scsi_bufflen(cmd: sc)); |
1884 | scsi_done(cmd: sc); |
1885 | return 0; |
1886 | } |
1887 | EXPORT_SYMBOL_GPL(iscsi_queuecommand); |
1888 | |
1889 | int iscsi_target_alloc(struct scsi_target *starget) |
1890 | { |
1891 | struct iscsi_cls_session *cls_session = starget_to_session(starget); |
1892 | struct iscsi_session *session = cls_session->dd_data; |
1893 | |
1894 | starget->can_queue = session->scsi_cmds_max; |
1895 | return 0; |
1896 | } |
1897 | EXPORT_SYMBOL_GPL(iscsi_target_alloc); |
1898 | |
1899 | static void iscsi_tmf_timedout(struct timer_list *t) |
1900 | { |
1901 | struct iscsi_session *session = from_timer(session, t, tmf_timer); |
1902 | |
1903 | spin_lock(lock: &session->frwd_lock); |
1904 | if (session->tmf_state == TMF_QUEUED) { |
1905 | session->tmf_state = TMF_TIMEDOUT; |
1906 | ISCSI_DBG_EH(session, "tmf timedout\n" ); |
1907 | /* unblock eh_abort() */ |
1908 | wake_up(&session->ehwait); |
1909 | } |
1910 | spin_unlock(lock: &session->frwd_lock); |
1911 | } |
1912 | |
1913 | static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn, |
1914 | struct iscsi_tm *hdr, int age, |
1915 | int timeout) |
1916 | __must_hold(&session->frwd_lock) |
1917 | { |
1918 | struct iscsi_session *session = conn->session; |
1919 | |
1920 | if (__iscsi_conn_send_pdu(conn, hdr: (struct iscsi_hdr *)hdr, NULL, data_size: 0)) { |
1921 | spin_unlock_bh(lock: &session->frwd_lock); |
1922 | iscsi_conn_printk(KERN_ERR, conn, "Could not send TMF.\n" ); |
1923 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
1924 | spin_lock_bh(lock: &session->frwd_lock); |
1925 | return -EPERM; |
1926 | } |
1927 | conn->tmfcmd_pdus_cnt++; |
1928 | session->tmf_timer.expires = timeout * HZ + jiffies; |
1929 | add_timer(timer: &session->tmf_timer); |
1930 | ISCSI_DBG_EH(session, "tmf set timeout\n" ); |
1931 | |
1932 | spin_unlock_bh(lock: &session->frwd_lock); |
1933 | mutex_unlock(lock: &session->eh_mutex); |
1934 | |
1935 | /* |
1936 | * block eh thread until: |
1937 | * |
1938 | * 1) tmf response |
1939 | * 2) tmf timeout |
1940 | * 3) session is terminated or restarted or userspace has |
1941 | * given up on recovery |
1942 | */ |
1943 | wait_event_interruptible(session->ehwait, age != session->age || |
1944 | session->state != ISCSI_STATE_LOGGED_IN || |
1945 | session->tmf_state != TMF_QUEUED); |
1946 | if (signal_pending(current)) |
1947 | flush_signals(current); |
1948 | del_timer_sync(timer: &session->tmf_timer); |
1949 | |
1950 | mutex_lock(&session->eh_mutex); |
1951 | spin_lock_bh(lock: &session->frwd_lock); |
1952 | /* if the session drops it will clean up the task */ |
1953 | if (age != session->age || |
1954 | session->state != ISCSI_STATE_LOGGED_IN) |
1955 | return -ENOTCONN; |
1956 | return 0; |
1957 | } |
1958 | |
1959 | /* |
1960 | * Fail commands. session frwd lock held and xmit thread flushed. |
1961 | */ |
1962 | static void fail_scsi_tasks(struct iscsi_conn *conn, u64 lun, int error) |
1963 | { |
1964 | struct iscsi_session *session = conn->session; |
1965 | struct iscsi_task *task; |
1966 | int i; |
1967 | |
1968 | restart_cmd_loop: |
1969 | spin_lock_bh(lock: &session->back_lock); |
1970 | for (i = 0; i < session->cmds_max; i++) { |
1971 | task = session->cmds[i]; |
1972 | if (!task->sc || task->state == ISCSI_TASK_FREE) |
1973 | continue; |
1974 | |
1975 | if (lun != -1 && lun != task->sc->device->lun) |
1976 | continue; |
1977 | /* |
1978 | * The cmd is completing but if this is called from an eh |
1979 | * callout path then when we return scsi-ml owns the cmd. Wait |
1980 | * for the completion path to finish freeing the cmd. |
1981 | */ |
1982 | if (!iscsi_get_task(task)) { |
1983 | spin_unlock_bh(lock: &session->back_lock); |
1984 | spin_unlock_bh(lock: &session->frwd_lock); |
1985 | udelay(ISCSI_CMD_COMPL_WAIT); |
1986 | spin_lock_bh(lock: &session->frwd_lock); |
1987 | goto restart_cmd_loop; |
1988 | } |
1989 | |
1990 | ISCSI_DBG_SESSION(session, |
1991 | "failing sc %p itt 0x%x state %d\n" , |
1992 | task->sc, task->itt, task->state); |
1993 | __fail_scsi_task(task, err: error); |
1994 | __iscsi_put_task(task); |
1995 | } |
1996 | spin_unlock_bh(lock: &session->back_lock); |
1997 | } |
1998 | |
1999 | /** |
2000 | * iscsi_suspend_queue - suspend iscsi_queuecommand |
2001 | * @conn: iscsi conn to stop queueing IO on |
2002 | * |
2003 | * This grabs the session frwd_lock to make sure no one is in |
2004 | * xmit_task/queuecommand, and then sets suspend to prevent |
2005 | * new commands from being queued. This only needs to be called |
2006 | * by offload drivers that need to sync a path like ep disconnect |
2007 | * with the iscsi_queuecommand/xmit_task. To start IO again libiscsi |
2008 | * will call iscsi_start_tx and iscsi_unblock_session when in FFP. |
2009 | */ |
2010 | void iscsi_suspend_queue(struct iscsi_conn *conn) |
2011 | { |
2012 | spin_lock_bh(lock: &conn->session->frwd_lock); |
2013 | set_bit(ISCSI_CONN_FLAG_SUSPEND_TX, addr: &conn->flags); |
2014 | spin_unlock_bh(lock: &conn->session->frwd_lock); |
2015 | } |
2016 | EXPORT_SYMBOL_GPL(iscsi_suspend_queue); |
2017 | |
2018 | /** |
2019 | * iscsi_suspend_tx - suspend iscsi_data_xmit |
2020 | * @conn: iscsi conn to stop processing IO on. |
2021 | * |
2022 | * This function sets the suspend bit to prevent iscsi_data_xmit |
2023 | * from sending new IO, and if work is queued on the xmit thread |
2024 | * it will wait for it to be completed. |
2025 | */ |
2026 | void iscsi_suspend_tx(struct iscsi_conn *conn) |
2027 | { |
2028 | struct Scsi_Host *shost = conn->session->host; |
2029 | struct iscsi_host *ihost = shost_priv(shost); |
2030 | |
2031 | set_bit(ISCSI_CONN_FLAG_SUSPEND_TX, addr: &conn->flags); |
2032 | if (ihost->workq) |
2033 | flush_work(work: &conn->xmitwork); |
2034 | } |
2035 | EXPORT_SYMBOL_GPL(iscsi_suspend_tx); |
2036 | |
2037 | static void iscsi_start_tx(struct iscsi_conn *conn) |
2038 | { |
2039 | clear_bit(ISCSI_CONN_FLAG_SUSPEND_TX, addr: &conn->flags); |
2040 | iscsi_conn_queue_xmit(conn); |
2041 | } |
2042 | |
2043 | /** |
2044 | * iscsi_suspend_rx - Prevent recvwork from running again. |
2045 | * @conn: iscsi conn to stop. |
2046 | */ |
2047 | void iscsi_suspend_rx(struct iscsi_conn *conn) |
2048 | { |
2049 | struct Scsi_Host *shost = conn->session->host; |
2050 | struct iscsi_host *ihost = shost_priv(shost); |
2051 | |
2052 | set_bit(ISCSI_CONN_FLAG_SUSPEND_RX, addr: &conn->flags); |
2053 | if (ihost->workq) |
2054 | flush_work(work: &conn->recvwork); |
2055 | } |
2056 | EXPORT_SYMBOL_GPL(iscsi_suspend_rx); |
2057 | |
2058 | /* |
2059 | * We want to make sure a ping is in flight. It has timed out. |
2060 | * And we are not busy processing a pdu that is making |
2061 | * progress but got started before the ping and is taking a while |
2062 | * to complete so the ping is just stuck behind it in a queue. |
2063 | */ |
2064 | static int iscsi_has_ping_timed_out(struct iscsi_conn *conn) |
2065 | { |
2066 | if (READ_ONCE(conn->ping_task) && |
2067 | time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) + |
2068 | (conn->ping_timeout * HZ), jiffies)) |
2069 | return 1; |
2070 | else |
2071 | return 0; |
2072 | } |
2073 | |
2074 | enum scsi_timeout_action iscsi_eh_cmd_timed_out(struct scsi_cmnd *sc) |
2075 | { |
2076 | enum scsi_timeout_action rc = SCSI_EH_NOT_HANDLED; |
2077 | struct iscsi_task *task = NULL, *running_task; |
2078 | struct iscsi_cls_session *cls_session; |
2079 | struct iscsi_session *session; |
2080 | struct iscsi_conn *conn; |
2081 | int i; |
2082 | |
2083 | cls_session = starget_to_session(scsi_target(sc->device)); |
2084 | session = cls_session->dd_data; |
2085 | |
2086 | ISCSI_DBG_EH(session, "scsi cmd %p timedout\n" , sc); |
2087 | |
2088 | spin_lock_bh(lock: &session->frwd_lock); |
2089 | spin_lock(lock: &session->back_lock); |
2090 | task = iscsi_cmd(cmd: sc)->task; |
2091 | if (!task) { |
2092 | /* |
2093 | * Raced with completion. Blk layer has taken ownership |
2094 | * so let timeout code complete it now. |
2095 | */ |
2096 | rc = SCSI_EH_NOT_HANDLED; |
2097 | spin_unlock(lock: &session->back_lock); |
2098 | goto done; |
2099 | } |
2100 | if (!iscsi_get_task(task)) { |
2101 | /* |
2102 | * Racing with the completion path right now, so give it more |
2103 | * time so that path can complete it like normal. |
2104 | */ |
2105 | rc = SCSI_EH_RESET_TIMER; |
2106 | task = NULL; |
2107 | spin_unlock(lock: &session->back_lock); |
2108 | goto done; |
2109 | } |
2110 | spin_unlock(lock: &session->back_lock); |
2111 | |
2112 | if (session->state != ISCSI_STATE_LOGGED_IN) { |
2113 | /* |
2114 | * During shutdown, if session is prematurely disconnected, |
2115 | * recovery won't happen and there will be hung cmds. Not |
2116 | * handling cmds would trigger EH, also bad in this case. |
2117 | * Instead, handle cmd, allow completion to happen and let |
2118 | * upper layer to deal with the result. |
2119 | */ |
2120 | if (unlikely(system_state != SYSTEM_RUNNING)) { |
2121 | sc->result = DID_NO_CONNECT << 16; |
2122 | ISCSI_DBG_EH(session, "sc on shutdown, handled\n" ); |
2123 | rc = SCSI_EH_NOT_HANDLED; |
2124 | goto done; |
2125 | } |
2126 | /* |
2127 | * We are probably in the middle of iscsi recovery so let |
2128 | * that complete and handle the error. |
2129 | */ |
2130 | rc = SCSI_EH_RESET_TIMER; |
2131 | goto done; |
2132 | } |
2133 | |
2134 | conn = session->leadconn; |
2135 | if (!conn) { |
2136 | /* In the middle of shuting down */ |
2137 | rc = SCSI_EH_RESET_TIMER; |
2138 | goto done; |
2139 | } |
2140 | |
2141 | /* |
2142 | * If we have sent (at least queued to the network layer) a pdu or |
2143 | * recvd one for the task since the last timeout ask for |
2144 | * more time. If on the next timeout we have not made progress |
2145 | * we can check if it is the task or connection when we send the |
2146 | * nop as a ping. |
2147 | */ |
2148 | if (time_after(task->last_xfer, task->last_timeout)) { |
2149 | ISCSI_DBG_EH(session, "Command making progress. Asking " |
2150 | "scsi-ml for more time to complete. " |
2151 | "Last data xfer at %lu. Last timeout was at " |
2152 | "%lu\n." , task->last_xfer, task->last_timeout); |
2153 | task->have_checked_conn = false; |
2154 | rc = SCSI_EH_RESET_TIMER; |
2155 | goto done; |
2156 | } |
2157 | |
2158 | if (!conn->recv_timeout && !conn->ping_timeout) |
2159 | goto done; |
2160 | /* |
2161 | * if the ping timedout then we are in the middle of cleaning up |
2162 | * and can let the iscsi eh handle it |
2163 | */ |
2164 | if (iscsi_has_ping_timed_out(conn)) { |
2165 | rc = SCSI_EH_RESET_TIMER; |
2166 | goto done; |
2167 | } |
2168 | |
2169 | spin_lock(lock: &session->back_lock); |
2170 | for (i = 0; i < conn->session->cmds_max; i++) { |
2171 | running_task = conn->session->cmds[i]; |
2172 | if (!running_task->sc || running_task == task || |
2173 | running_task->state != ISCSI_TASK_RUNNING) |
2174 | continue; |
2175 | |
2176 | /* |
2177 | * Only check if cmds started before this one have made |
2178 | * progress, or this could never fail |
2179 | */ |
2180 | if (time_after(running_task->sc->jiffies_at_alloc, |
2181 | task->sc->jiffies_at_alloc)) |
2182 | continue; |
2183 | |
2184 | if (time_after(running_task->last_xfer, task->last_timeout)) { |
2185 | /* |
2186 | * This task has not made progress, but a task |
2187 | * started before us has transferred data since |
2188 | * we started/last-checked. We could be queueing |
2189 | * too many tasks or the LU is bad. |
2190 | * |
2191 | * If the device is bad the cmds ahead of us on |
2192 | * other devs will complete, and this loop will |
2193 | * eventually fail starting the scsi eh. |
2194 | */ |
2195 | ISCSI_DBG_EH(session, "Command has not made progress " |
2196 | "but commands ahead of it have. " |
2197 | "Asking scsi-ml for more time to " |
2198 | "complete. Our last xfer vs running task " |
2199 | "last xfer %lu/%lu. Last check %lu.\n" , |
2200 | task->last_xfer, running_task->last_xfer, |
2201 | task->last_timeout); |
2202 | spin_unlock(lock: &session->back_lock); |
2203 | rc = SCSI_EH_RESET_TIMER; |
2204 | goto done; |
2205 | } |
2206 | } |
2207 | spin_unlock(lock: &session->back_lock); |
2208 | |
2209 | /* Assumes nop timeout is shorter than scsi cmd timeout */ |
2210 | if (task->have_checked_conn) |
2211 | goto done; |
2212 | |
2213 | /* |
2214 | * Checking the transport already or nop from a cmd timeout still |
2215 | * running |
2216 | */ |
2217 | if (READ_ONCE(conn->ping_task)) { |
2218 | task->have_checked_conn = true; |
2219 | rc = SCSI_EH_RESET_TIMER; |
2220 | goto done; |
2221 | } |
2222 | |
2223 | /* Make sure there is a transport check done */ |
2224 | iscsi_send_nopout(conn, NULL); |
2225 | task->have_checked_conn = true; |
2226 | rc = SCSI_EH_RESET_TIMER; |
2227 | |
2228 | done: |
2229 | spin_unlock_bh(lock: &session->frwd_lock); |
2230 | |
2231 | if (task) { |
2232 | task->last_timeout = jiffies; |
2233 | iscsi_put_task(task); |
2234 | } |
2235 | ISCSI_DBG_EH(session, "return %s\n" , rc == SCSI_EH_RESET_TIMER ? |
2236 | "timer reset" : "shutdown or nh" ); |
2237 | return rc; |
2238 | } |
2239 | EXPORT_SYMBOL_GPL(iscsi_eh_cmd_timed_out); |
2240 | |
2241 | static void iscsi_check_transport_timeouts(struct timer_list *t) |
2242 | { |
2243 | struct iscsi_conn *conn = from_timer(conn, t, transport_timer); |
2244 | struct iscsi_session *session = conn->session; |
2245 | unsigned long recv_timeout, next_timeout = 0, last_recv; |
2246 | |
2247 | spin_lock(lock: &session->frwd_lock); |
2248 | if (session->state != ISCSI_STATE_LOGGED_IN) |
2249 | goto done; |
2250 | |
2251 | recv_timeout = conn->recv_timeout; |
2252 | if (!recv_timeout) |
2253 | goto done; |
2254 | |
2255 | recv_timeout *= HZ; |
2256 | last_recv = conn->last_recv; |
2257 | |
2258 | if (iscsi_has_ping_timed_out(conn)) { |
2259 | iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs " |
2260 | "expired, recv timeout %d, last rx %lu, " |
2261 | "last ping %lu, now %lu\n" , |
2262 | conn->ping_timeout, conn->recv_timeout, |
2263 | last_recv, conn->last_ping, jiffies); |
2264 | spin_unlock(lock: &session->frwd_lock); |
2265 | iscsi_conn_failure(conn, ISCSI_ERR_NOP_TIMEDOUT); |
2266 | return; |
2267 | } |
2268 | |
2269 | if (time_before_eq(last_recv + recv_timeout, jiffies)) { |
2270 | /* send a ping to try to provoke some traffic */ |
2271 | ISCSI_DBG_CONN(conn, "Sending nopout as ping\n" ); |
2272 | if (iscsi_send_nopout(conn, NULL)) |
2273 | next_timeout = jiffies + (1 * HZ); |
2274 | else |
2275 | next_timeout = conn->last_ping + (conn->ping_timeout * HZ); |
2276 | } else |
2277 | next_timeout = last_recv + recv_timeout; |
2278 | |
2279 | ISCSI_DBG_CONN(conn, "Setting next tmo %lu\n" , next_timeout); |
2280 | mod_timer(timer: &conn->transport_timer, expires: next_timeout); |
2281 | done: |
2282 | spin_unlock(lock: &session->frwd_lock); |
2283 | } |
2284 | |
2285 | /** |
2286 | * iscsi_conn_unbind - prevent queueing to conn. |
2287 | * @cls_conn: iscsi conn ep is bound to. |
2288 | * @is_active: is the conn in use for boot or is this for EH/termination |
2289 | * |
2290 | * This must be called by drivers implementing the ep_disconnect callout. |
2291 | * It disables queueing to the connection from libiscsi in preparation for |
2292 | * an ep_disconnect call. |
2293 | */ |
2294 | void iscsi_conn_unbind(struct iscsi_cls_conn *cls_conn, bool is_active) |
2295 | { |
2296 | struct iscsi_session *session; |
2297 | struct iscsi_conn *conn; |
2298 | |
2299 | if (!cls_conn) |
2300 | return; |
2301 | |
2302 | conn = cls_conn->dd_data; |
2303 | session = conn->session; |
2304 | /* |
2305 | * Wait for iscsi_eh calls to exit. We don't wait for the tmf to |
2306 | * complete or timeout. The caller just wants to know what's running |
2307 | * is everything that needs to be cleaned up, and no cmds will be |
2308 | * queued. |
2309 | */ |
2310 | mutex_lock(&session->eh_mutex); |
2311 | |
2312 | iscsi_suspend_queue(conn); |
2313 | iscsi_suspend_tx(conn); |
2314 | |
2315 | spin_lock_bh(lock: &session->frwd_lock); |
2316 | clear_bit(ISCSI_CONN_FLAG_BOUND, addr: &conn->flags); |
2317 | |
2318 | if (!is_active) { |
2319 | /* |
2320 | * if logout timed out before userspace could even send a PDU |
2321 | * the state might still be in ISCSI_STATE_LOGGED_IN and |
2322 | * allowing new cmds and TMFs. |
2323 | */ |
2324 | if (session->state == ISCSI_STATE_LOGGED_IN) |
2325 | iscsi_set_conn_failed(conn); |
2326 | } |
2327 | spin_unlock_bh(lock: &session->frwd_lock); |
2328 | mutex_unlock(lock: &session->eh_mutex); |
2329 | } |
2330 | EXPORT_SYMBOL_GPL(iscsi_conn_unbind); |
2331 | |
2332 | static void iscsi_prep_abort_task_pdu(struct iscsi_task *task, |
2333 | struct iscsi_tm *hdr) |
2334 | { |
2335 | memset(hdr, 0, sizeof(*hdr)); |
2336 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; |
2337 | hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK; |
2338 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; |
2339 | hdr->lun = task->lun; |
2340 | hdr->rtt = task->hdr_itt; |
2341 | hdr->refcmdsn = task->cmdsn; |
2342 | } |
2343 | |
2344 | int iscsi_eh_abort(struct scsi_cmnd *sc) |
2345 | { |
2346 | struct iscsi_cls_session *cls_session; |
2347 | struct iscsi_session *session; |
2348 | struct iscsi_conn *conn; |
2349 | struct iscsi_task *task; |
2350 | struct iscsi_tm *hdr; |
2351 | int age; |
2352 | |
2353 | cls_session = starget_to_session(scsi_target(sc->device)); |
2354 | session = cls_session->dd_data; |
2355 | |
2356 | ISCSI_DBG_EH(session, "aborting sc %p\n" , sc); |
2357 | |
2358 | completion_check: |
2359 | mutex_lock(&session->eh_mutex); |
2360 | spin_lock_bh(lock: &session->frwd_lock); |
2361 | /* |
2362 | * if session was ISCSI_STATE_IN_RECOVERY then we may not have |
2363 | * got the command. |
2364 | */ |
2365 | if (!iscsi_cmd(cmd: sc)->task) { |
2366 | ISCSI_DBG_EH(session, "sc never reached iscsi layer or " |
2367 | "it completed.\n" ); |
2368 | spin_unlock_bh(lock: &session->frwd_lock); |
2369 | mutex_unlock(lock: &session->eh_mutex); |
2370 | return SUCCESS; |
2371 | } |
2372 | |
2373 | /* |
2374 | * If we are not logged in or we have started a new session |
2375 | * then let the host reset code handle this |
2376 | */ |
2377 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN || |
2378 | iscsi_cmd(cmd: sc)->age != session->age) { |
2379 | spin_unlock_bh(lock: &session->frwd_lock); |
2380 | mutex_unlock(lock: &session->eh_mutex); |
2381 | ISCSI_DBG_EH(session, "failing abort due to dropped " |
2382 | "session.\n" ); |
2383 | return FAILED; |
2384 | } |
2385 | |
2386 | spin_lock(lock: &session->back_lock); |
2387 | task = iscsi_cmd(cmd: sc)->task; |
2388 | if (!task || !task->sc) { |
2389 | /* task completed before time out */ |
2390 | ISCSI_DBG_EH(session, "sc completed while abort in progress\n" ); |
2391 | |
2392 | spin_unlock(lock: &session->back_lock); |
2393 | spin_unlock_bh(lock: &session->frwd_lock); |
2394 | mutex_unlock(lock: &session->eh_mutex); |
2395 | return SUCCESS; |
2396 | } |
2397 | |
2398 | if (!iscsi_get_task(task)) { |
2399 | spin_unlock(lock: &session->back_lock); |
2400 | spin_unlock_bh(lock: &session->frwd_lock); |
2401 | mutex_unlock(lock: &session->eh_mutex); |
2402 | /* We are just about to call iscsi_free_task so wait for it. */ |
2403 | udelay(ISCSI_CMD_COMPL_WAIT); |
2404 | goto completion_check; |
2405 | } |
2406 | |
2407 | ISCSI_DBG_EH(session, "aborting [sc %p itt 0x%x]\n" , sc, task->itt); |
2408 | conn = session->leadconn; |
2409 | iscsi_get_conn(conn: conn->cls_conn); |
2410 | conn->eh_abort_cnt++; |
2411 | age = session->age; |
2412 | spin_unlock(lock: &session->back_lock); |
2413 | |
2414 | if (task->state == ISCSI_TASK_PENDING) { |
2415 | fail_scsi_task(task, err: DID_ABORT); |
2416 | goto success; |
2417 | } |
2418 | |
2419 | /* only have one tmf outstanding at a time */ |
2420 | if (session->tmf_state != TMF_INITIAL) |
2421 | goto failed; |
2422 | session->tmf_state = TMF_QUEUED; |
2423 | |
2424 | hdr = &session->tmhdr; |
2425 | iscsi_prep_abort_task_pdu(task, hdr); |
2426 | |
2427 | if (iscsi_exec_task_mgmt_fn(conn, hdr, age, timeout: session->abort_timeout)) |
2428 | goto failed; |
2429 | |
2430 | switch (session->tmf_state) { |
2431 | case TMF_SUCCESS: |
2432 | spin_unlock_bh(lock: &session->frwd_lock); |
2433 | /* |
2434 | * stop tx side incase the target had sent a abort rsp but |
2435 | * the initiator was still writing out data. |
2436 | */ |
2437 | iscsi_suspend_tx(conn); |
2438 | /* |
2439 | * we do not stop the recv side because targets have been |
2440 | * good and have never sent us a successful tmf response |
2441 | * then sent more data for the cmd. |
2442 | */ |
2443 | spin_lock_bh(lock: &session->frwd_lock); |
2444 | fail_scsi_task(task, err: DID_ABORT); |
2445 | session->tmf_state = TMF_INITIAL; |
2446 | memset(hdr, 0, sizeof(*hdr)); |
2447 | spin_unlock_bh(lock: &session->frwd_lock); |
2448 | iscsi_start_tx(conn); |
2449 | goto success_unlocked; |
2450 | case TMF_TIMEDOUT: |
2451 | session->running_aborted_task = task; |
2452 | spin_unlock_bh(lock: &session->frwd_lock); |
2453 | iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); |
2454 | goto failed_unlocked; |
2455 | case TMF_NOT_FOUND: |
2456 | if (iscsi_task_is_completed(task)) { |
2457 | session->tmf_state = TMF_INITIAL; |
2458 | memset(hdr, 0, sizeof(*hdr)); |
2459 | /* task completed before tmf abort response */ |
2460 | ISCSI_DBG_EH(session, "sc completed while abort in " |
2461 | "progress\n" ); |
2462 | goto success; |
2463 | } |
2464 | fallthrough; |
2465 | default: |
2466 | session->tmf_state = TMF_INITIAL; |
2467 | goto failed; |
2468 | } |
2469 | |
2470 | success: |
2471 | spin_unlock_bh(lock: &session->frwd_lock); |
2472 | success_unlocked: |
2473 | ISCSI_DBG_EH(session, "abort success [sc %p itt 0x%x]\n" , |
2474 | sc, task->itt); |
2475 | iscsi_put_task(task); |
2476 | iscsi_put_conn(conn: conn->cls_conn); |
2477 | mutex_unlock(lock: &session->eh_mutex); |
2478 | return SUCCESS; |
2479 | |
2480 | failed: |
2481 | spin_unlock_bh(lock: &session->frwd_lock); |
2482 | failed_unlocked: |
2483 | ISCSI_DBG_EH(session, "abort failed [sc %p itt 0x%x]\n" , sc, |
2484 | task ? task->itt : 0); |
2485 | /* |
2486 | * The driver might be accessing the task so hold the ref. The conn |
2487 | * stop cleanup will drop the ref after ep_disconnect so we know the |
2488 | * driver's no longer touching the task. |
2489 | */ |
2490 | if (!session->running_aborted_task) |
2491 | iscsi_put_task(task); |
2492 | |
2493 | iscsi_put_conn(conn: conn->cls_conn); |
2494 | mutex_unlock(lock: &session->eh_mutex); |
2495 | return FAILED; |
2496 | } |
2497 | EXPORT_SYMBOL_GPL(iscsi_eh_abort); |
2498 | |
2499 | static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr) |
2500 | { |
2501 | memset(hdr, 0, sizeof(*hdr)); |
2502 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; |
2503 | hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK; |
2504 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; |
2505 | int_to_scsilun(sc->device->lun, &hdr->lun); |
2506 | hdr->rtt = RESERVED_ITT; |
2507 | } |
2508 | |
2509 | int iscsi_eh_device_reset(struct scsi_cmnd *sc) |
2510 | { |
2511 | struct iscsi_cls_session *cls_session; |
2512 | struct iscsi_session *session; |
2513 | struct iscsi_conn *conn; |
2514 | struct iscsi_tm *hdr; |
2515 | int rc = FAILED; |
2516 | |
2517 | cls_session = starget_to_session(scsi_target(sc->device)); |
2518 | session = cls_session->dd_data; |
2519 | |
2520 | ISCSI_DBG_EH(session, "LU Reset [sc %p lun %llu]\n" , sc, |
2521 | sc->device->lun); |
2522 | |
2523 | mutex_lock(&session->eh_mutex); |
2524 | spin_lock_bh(lock: &session->frwd_lock); |
2525 | /* |
2526 | * Just check if we are not logged in. We cannot check for |
2527 | * the phase because the reset could come from a ioctl. |
2528 | */ |
2529 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN) |
2530 | goto unlock; |
2531 | conn = session->leadconn; |
2532 | |
2533 | /* only have one tmf outstanding at a time */ |
2534 | if (session->tmf_state != TMF_INITIAL) |
2535 | goto unlock; |
2536 | session->tmf_state = TMF_QUEUED; |
2537 | |
2538 | hdr = &session->tmhdr; |
2539 | iscsi_prep_lun_reset_pdu(sc, hdr); |
2540 | |
2541 | if (iscsi_exec_task_mgmt_fn(conn, hdr, age: session->age, |
2542 | timeout: session->lu_reset_timeout)) { |
2543 | rc = FAILED; |
2544 | goto unlock; |
2545 | } |
2546 | |
2547 | switch (session->tmf_state) { |
2548 | case TMF_SUCCESS: |
2549 | break; |
2550 | case TMF_TIMEDOUT: |
2551 | spin_unlock_bh(lock: &session->frwd_lock); |
2552 | iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); |
2553 | goto done; |
2554 | default: |
2555 | session->tmf_state = TMF_INITIAL; |
2556 | goto unlock; |
2557 | } |
2558 | |
2559 | rc = SUCCESS; |
2560 | spin_unlock_bh(lock: &session->frwd_lock); |
2561 | |
2562 | iscsi_suspend_tx(conn); |
2563 | |
2564 | spin_lock_bh(lock: &session->frwd_lock); |
2565 | memset(hdr, 0, sizeof(*hdr)); |
2566 | fail_scsi_tasks(conn, lun: sc->device->lun, error: DID_ERROR); |
2567 | session->tmf_state = TMF_INITIAL; |
2568 | spin_unlock_bh(lock: &session->frwd_lock); |
2569 | |
2570 | iscsi_start_tx(conn); |
2571 | goto done; |
2572 | |
2573 | unlock: |
2574 | spin_unlock_bh(lock: &session->frwd_lock); |
2575 | done: |
2576 | ISCSI_DBG_EH(session, "dev reset result = %s\n" , |
2577 | rc == SUCCESS ? "SUCCESS" : "FAILED" ); |
2578 | mutex_unlock(lock: &session->eh_mutex); |
2579 | return rc; |
2580 | } |
2581 | EXPORT_SYMBOL_GPL(iscsi_eh_device_reset); |
2582 | |
2583 | void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session) |
2584 | { |
2585 | struct iscsi_session *session = cls_session->dd_data; |
2586 | |
2587 | spin_lock_bh(lock: &session->frwd_lock); |
2588 | if (session->state != ISCSI_STATE_LOGGED_IN) { |
2589 | session->state = ISCSI_STATE_RECOVERY_FAILED; |
2590 | wake_up(&session->ehwait); |
2591 | } |
2592 | spin_unlock_bh(lock: &session->frwd_lock); |
2593 | } |
2594 | EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout); |
2595 | |
2596 | /** |
2597 | * iscsi_eh_session_reset - drop session and attempt relogin |
2598 | * @sc: scsi command |
2599 | * |
2600 | * This function will wait for a relogin, session termination from |
2601 | * userspace, or a recovery/replacement timeout. |
2602 | */ |
2603 | int iscsi_eh_session_reset(struct scsi_cmnd *sc) |
2604 | { |
2605 | struct iscsi_cls_session *cls_session; |
2606 | struct iscsi_session *session; |
2607 | struct iscsi_conn *conn; |
2608 | |
2609 | cls_session = starget_to_session(scsi_target(sc->device)); |
2610 | session = cls_session->dd_data; |
2611 | |
2612 | mutex_lock(&session->eh_mutex); |
2613 | spin_lock_bh(lock: &session->frwd_lock); |
2614 | if (session->state == ISCSI_STATE_TERMINATE) { |
2615 | failed: |
2616 | ISCSI_DBG_EH(session, |
2617 | "failing session reset: Could not log back into " |
2618 | "%s [age %d]\n" , session->targetname, |
2619 | session->age); |
2620 | spin_unlock_bh(lock: &session->frwd_lock); |
2621 | mutex_unlock(lock: &session->eh_mutex); |
2622 | return FAILED; |
2623 | } |
2624 | |
2625 | conn = session->leadconn; |
2626 | iscsi_get_conn(conn: conn->cls_conn); |
2627 | |
2628 | spin_unlock_bh(lock: &session->frwd_lock); |
2629 | mutex_unlock(lock: &session->eh_mutex); |
2630 | |
2631 | iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); |
2632 | iscsi_put_conn(conn: conn->cls_conn); |
2633 | |
2634 | ISCSI_DBG_EH(session, "wait for relogin\n" ); |
2635 | wait_event_interruptible(session->ehwait, |
2636 | session->state == ISCSI_STATE_TERMINATE || |
2637 | session->state == ISCSI_STATE_LOGGED_IN || |
2638 | session->state == ISCSI_STATE_RECOVERY_FAILED); |
2639 | if (signal_pending(current)) |
2640 | flush_signals(current); |
2641 | |
2642 | mutex_lock(&session->eh_mutex); |
2643 | spin_lock_bh(lock: &session->frwd_lock); |
2644 | if (session->state == ISCSI_STATE_LOGGED_IN) { |
2645 | ISCSI_DBG_EH(session, |
2646 | "session reset succeeded for %s,%s\n" , |
2647 | session->targetname, conn->persistent_address); |
2648 | } else |
2649 | goto failed; |
2650 | spin_unlock_bh(lock: &session->frwd_lock); |
2651 | mutex_unlock(lock: &session->eh_mutex); |
2652 | return SUCCESS; |
2653 | } |
2654 | EXPORT_SYMBOL_GPL(iscsi_eh_session_reset); |
2655 | |
2656 | static void iscsi_prep_tgt_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr) |
2657 | { |
2658 | memset(hdr, 0, sizeof(*hdr)); |
2659 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; |
2660 | hdr->flags = ISCSI_TM_FUNC_TARGET_WARM_RESET & ISCSI_FLAG_TM_FUNC_MASK; |
2661 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; |
2662 | hdr->rtt = RESERVED_ITT; |
2663 | } |
2664 | |
2665 | /** |
2666 | * iscsi_eh_target_reset - reset target |
2667 | * @sc: scsi command |
2668 | * |
2669 | * This will attempt to send a warm target reset. |
2670 | */ |
2671 | static int iscsi_eh_target_reset(struct scsi_cmnd *sc) |
2672 | { |
2673 | struct iscsi_cls_session *cls_session; |
2674 | struct iscsi_session *session; |
2675 | struct iscsi_conn *conn; |
2676 | struct iscsi_tm *hdr; |
2677 | int rc = FAILED; |
2678 | |
2679 | cls_session = starget_to_session(scsi_target(sc->device)); |
2680 | session = cls_session->dd_data; |
2681 | |
2682 | ISCSI_DBG_EH(session, "tgt Reset [sc %p tgt %s]\n" , sc, |
2683 | session->targetname); |
2684 | |
2685 | mutex_lock(&session->eh_mutex); |
2686 | spin_lock_bh(lock: &session->frwd_lock); |
2687 | /* |
2688 | * Just check if we are not logged in. We cannot check for |
2689 | * the phase because the reset could come from a ioctl. |
2690 | */ |
2691 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN) |
2692 | goto unlock; |
2693 | conn = session->leadconn; |
2694 | |
2695 | /* only have one tmf outstanding at a time */ |
2696 | if (session->tmf_state != TMF_INITIAL) |
2697 | goto unlock; |
2698 | session->tmf_state = TMF_QUEUED; |
2699 | |
2700 | hdr = &session->tmhdr; |
2701 | iscsi_prep_tgt_reset_pdu(sc, hdr); |
2702 | |
2703 | if (iscsi_exec_task_mgmt_fn(conn, hdr, age: session->age, |
2704 | timeout: session->tgt_reset_timeout)) { |
2705 | rc = FAILED; |
2706 | goto unlock; |
2707 | } |
2708 | |
2709 | switch (session->tmf_state) { |
2710 | case TMF_SUCCESS: |
2711 | break; |
2712 | case TMF_TIMEDOUT: |
2713 | spin_unlock_bh(lock: &session->frwd_lock); |
2714 | iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); |
2715 | goto done; |
2716 | default: |
2717 | session->tmf_state = TMF_INITIAL; |
2718 | goto unlock; |
2719 | } |
2720 | |
2721 | rc = SUCCESS; |
2722 | spin_unlock_bh(lock: &session->frwd_lock); |
2723 | |
2724 | iscsi_suspend_tx(conn); |
2725 | |
2726 | spin_lock_bh(lock: &session->frwd_lock); |
2727 | memset(hdr, 0, sizeof(*hdr)); |
2728 | fail_scsi_tasks(conn, lun: -1, error: DID_ERROR); |
2729 | session->tmf_state = TMF_INITIAL; |
2730 | spin_unlock_bh(lock: &session->frwd_lock); |
2731 | |
2732 | iscsi_start_tx(conn); |
2733 | goto done; |
2734 | |
2735 | unlock: |
2736 | spin_unlock_bh(lock: &session->frwd_lock); |
2737 | done: |
2738 | ISCSI_DBG_EH(session, "tgt %s reset result = %s\n" , session->targetname, |
2739 | rc == SUCCESS ? "SUCCESS" : "FAILED" ); |
2740 | mutex_unlock(lock: &session->eh_mutex); |
2741 | return rc; |
2742 | } |
2743 | |
2744 | /** |
2745 | * iscsi_eh_recover_target - reset target and possibly the session |
2746 | * @sc: scsi command |
2747 | * |
2748 | * This will attempt to send a warm target reset. If that fails, |
2749 | * we will escalate to ERL0 session recovery. |
2750 | */ |
2751 | int iscsi_eh_recover_target(struct scsi_cmnd *sc) |
2752 | { |
2753 | int rc; |
2754 | |
2755 | rc = iscsi_eh_target_reset(sc); |
2756 | if (rc == FAILED) |
2757 | rc = iscsi_eh_session_reset(sc); |
2758 | return rc; |
2759 | } |
2760 | EXPORT_SYMBOL_GPL(iscsi_eh_recover_target); |
2761 | |
2762 | /* |
2763 | * Pre-allocate a pool of @max items of @item_size. By default, the pool |
2764 | * should be accessed via kfifo_{get,put} on q->queue. |
2765 | * Optionally, the caller can obtain the array of object pointers |
2766 | * by passing in a non-NULL @items pointer |
2767 | */ |
2768 | int |
2769 | iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size) |
2770 | { |
2771 | int i, num_arrays = 1; |
2772 | |
2773 | memset(q, 0, sizeof(*q)); |
2774 | |
2775 | q->max = max; |
2776 | |
2777 | /* If the user passed an items pointer, he wants a copy of |
2778 | * the array. */ |
2779 | if (items) |
2780 | num_arrays++; |
2781 | q->pool = kvcalloc(n: num_arrays * max, size: sizeof(void *), GFP_KERNEL); |
2782 | if (q->pool == NULL) |
2783 | return -ENOMEM; |
2784 | |
2785 | kfifo_init(&q->queue, (void*)q->pool, max * sizeof(void*)); |
2786 | |
2787 | for (i = 0; i < max; i++) { |
2788 | q->pool[i] = kzalloc(size: item_size, GFP_KERNEL); |
2789 | if (q->pool[i] == NULL) { |
2790 | q->max = i; |
2791 | goto enomem; |
2792 | } |
2793 | kfifo_in(&q->queue, (void*)&q->pool[i], sizeof(void*)); |
2794 | } |
2795 | |
2796 | if (items) { |
2797 | *items = q->pool + max; |
2798 | memcpy(*items, q->pool, max * sizeof(void *)); |
2799 | } |
2800 | |
2801 | return 0; |
2802 | |
2803 | enomem: |
2804 | iscsi_pool_free(q); |
2805 | return -ENOMEM; |
2806 | } |
2807 | EXPORT_SYMBOL_GPL(iscsi_pool_init); |
2808 | |
2809 | void iscsi_pool_free(struct iscsi_pool *q) |
2810 | { |
2811 | int i; |
2812 | |
2813 | for (i = 0; i < q->max; i++) |
2814 | kfree(objp: q->pool[i]); |
2815 | kvfree(addr: q->pool); |
2816 | } |
2817 | EXPORT_SYMBOL_GPL(iscsi_pool_free); |
2818 | |
2819 | int iscsi_host_get_max_scsi_cmds(struct Scsi_Host *shost, |
2820 | uint16_t requested_cmds_max) |
2821 | { |
2822 | int scsi_cmds, total_cmds = requested_cmds_max; |
2823 | |
2824 | check: |
2825 | if (!total_cmds) |
2826 | total_cmds = ISCSI_DEF_XMIT_CMDS_MAX; |
2827 | /* |
2828 | * The iscsi layer needs some tasks for nop handling and tmfs, |
2829 | * so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX |
2830 | * + 1 command for scsi IO. |
2831 | */ |
2832 | if (total_cmds < ISCSI_TOTAL_CMDS_MIN) { |
2833 | printk(KERN_ERR "iscsi: invalid max cmds of %d. Must be a power of two that is at least %d.\n" , |
2834 | total_cmds, ISCSI_TOTAL_CMDS_MIN); |
2835 | return -EINVAL; |
2836 | } |
2837 | |
2838 | if (total_cmds > ISCSI_TOTAL_CMDS_MAX) { |
2839 | printk(KERN_INFO "iscsi: invalid max cmds of %d. Must be a power of 2 less than or equal to %d. Using %d.\n" , |
2840 | requested_cmds_max, ISCSI_TOTAL_CMDS_MAX, |
2841 | ISCSI_TOTAL_CMDS_MAX); |
2842 | total_cmds = ISCSI_TOTAL_CMDS_MAX; |
2843 | } |
2844 | |
2845 | if (!is_power_of_2(n: total_cmds)) { |
2846 | total_cmds = rounddown_pow_of_two(total_cmds); |
2847 | if (total_cmds < ISCSI_TOTAL_CMDS_MIN) { |
2848 | printk(KERN_ERR "iscsi: invalid max cmds of %d. Must be a power of 2 greater than %d.\n" , requested_cmds_max, ISCSI_TOTAL_CMDS_MIN); |
2849 | return -EINVAL; |
2850 | } |
2851 | |
2852 | printk(KERN_INFO "iscsi: invalid max cmds %d. Must be a power of 2. Rounding max cmds down to %d.\n" , |
2853 | requested_cmds_max, total_cmds); |
2854 | } |
2855 | |
2856 | scsi_cmds = total_cmds - ISCSI_MGMT_CMDS_MAX; |
2857 | if (shost->can_queue && scsi_cmds > shost->can_queue) { |
2858 | total_cmds = shost->can_queue; |
2859 | |
2860 | printk(KERN_INFO "iscsi: requested max cmds %u is higher than driver limit. Using driver limit %u\n" , |
2861 | requested_cmds_max, shost->can_queue); |
2862 | goto check; |
2863 | } |
2864 | |
2865 | return scsi_cmds; |
2866 | } |
2867 | EXPORT_SYMBOL_GPL(iscsi_host_get_max_scsi_cmds); |
2868 | |
2869 | /** |
2870 | * iscsi_host_add - add host to system |
2871 | * @shost: scsi host |
2872 | * @pdev: parent device |
2873 | * |
2874 | * This should be called by partial offload and software iscsi drivers |
2875 | * to add a host to the system. |
2876 | */ |
2877 | int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev) |
2878 | { |
2879 | if (!shost->can_queue) |
2880 | shost->can_queue = ISCSI_DEF_XMIT_CMDS_MAX; |
2881 | |
2882 | if (!shost->cmd_per_lun) |
2883 | shost->cmd_per_lun = ISCSI_DEF_CMD_PER_LUN; |
2884 | |
2885 | return scsi_add_host(host: shost, dev: pdev); |
2886 | } |
2887 | EXPORT_SYMBOL_GPL(iscsi_host_add); |
2888 | |
2889 | /** |
2890 | * iscsi_host_alloc - allocate a host and driver data |
2891 | * @sht: scsi host template |
2892 | * @dd_data_size: driver host data size |
2893 | * @xmit_can_sleep: bool indicating if LLD will queue IO from a work queue |
2894 | * |
2895 | * This should be called by partial offload and software iscsi drivers. |
2896 | * To access the driver specific memory use the iscsi_host_priv() macro. |
2897 | */ |
2898 | struct Scsi_Host *iscsi_host_alloc(const struct scsi_host_template *sht, |
2899 | int dd_data_size, bool xmit_can_sleep) |
2900 | { |
2901 | struct Scsi_Host *shost; |
2902 | struct iscsi_host *ihost; |
2903 | |
2904 | shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size); |
2905 | if (!shost) |
2906 | return NULL; |
2907 | ihost = shost_priv(shost); |
2908 | |
2909 | if (xmit_can_sleep) { |
2910 | ihost->workq = alloc_workqueue(fmt: "iscsi_q_%d" , |
2911 | flags: WQ_SYSFS | __WQ_LEGACY | WQ_MEM_RECLAIM | WQ_UNBOUND, |
2912 | max_active: 1, shost->host_no); |
2913 | if (!ihost->workq) |
2914 | goto free_host; |
2915 | } |
2916 | |
2917 | spin_lock_init(&ihost->lock); |
2918 | ihost->state = ISCSI_HOST_SETUP; |
2919 | ihost->num_sessions = 0; |
2920 | init_waitqueue_head(&ihost->session_removal_wq); |
2921 | return shost; |
2922 | |
2923 | free_host: |
2924 | scsi_host_put(t: shost); |
2925 | return NULL; |
2926 | } |
2927 | EXPORT_SYMBOL_GPL(iscsi_host_alloc); |
2928 | |
2929 | static void iscsi_notify_host_removed(struct iscsi_cls_session *cls_session) |
2930 | { |
2931 | iscsi_session_failure(cls_session->dd_data, ISCSI_ERR_INVALID_HOST); |
2932 | } |
2933 | |
2934 | /** |
2935 | * iscsi_host_remove - remove host and sessions |
2936 | * @shost: scsi host |
2937 | * @is_shutdown: true if called from a driver shutdown callout |
2938 | * |
2939 | * If there are any sessions left, this will initiate the removal and wait |
2940 | * for the completion. |
2941 | */ |
2942 | void iscsi_host_remove(struct Scsi_Host *shost, bool is_shutdown) |
2943 | { |
2944 | struct iscsi_host *ihost = shost_priv(shost); |
2945 | unsigned long flags; |
2946 | |
2947 | spin_lock_irqsave(&ihost->lock, flags); |
2948 | ihost->state = ISCSI_HOST_REMOVED; |
2949 | spin_unlock_irqrestore(lock: &ihost->lock, flags); |
2950 | |
2951 | if (!is_shutdown) |
2952 | iscsi_host_for_each_session(shost, fn: iscsi_notify_host_removed); |
2953 | else |
2954 | iscsi_host_for_each_session(shost, fn: iscsi_force_destroy_session); |
2955 | |
2956 | wait_event_interruptible(ihost->session_removal_wq, |
2957 | ihost->num_sessions == 0); |
2958 | if (signal_pending(current)) |
2959 | flush_signals(current); |
2960 | |
2961 | scsi_remove_host(shost); |
2962 | } |
2963 | EXPORT_SYMBOL_GPL(iscsi_host_remove); |
2964 | |
2965 | void iscsi_host_free(struct Scsi_Host *shost) |
2966 | { |
2967 | struct iscsi_host *ihost = shost_priv(shost); |
2968 | |
2969 | if (ihost->workq) |
2970 | destroy_workqueue(wq: ihost->workq); |
2971 | |
2972 | kfree(objp: ihost->netdev); |
2973 | kfree(objp: ihost->hwaddress); |
2974 | kfree(objp: ihost->initiatorname); |
2975 | scsi_host_put(t: shost); |
2976 | } |
2977 | EXPORT_SYMBOL_GPL(iscsi_host_free); |
2978 | |
2979 | static void iscsi_host_dec_session_cnt(struct Scsi_Host *shost) |
2980 | { |
2981 | struct iscsi_host *ihost = shost_priv(shost); |
2982 | unsigned long flags; |
2983 | |
2984 | shost = scsi_host_get(shost); |
2985 | if (!shost) { |
2986 | printk(KERN_ERR "Invalid state. Cannot notify host removal " |
2987 | "of session teardown event because host already " |
2988 | "removed.\n" ); |
2989 | return; |
2990 | } |
2991 | |
2992 | spin_lock_irqsave(&ihost->lock, flags); |
2993 | ihost->num_sessions--; |
2994 | if (ihost->num_sessions == 0) |
2995 | wake_up(&ihost->session_removal_wq); |
2996 | spin_unlock_irqrestore(lock: &ihost->lock, flags); |
2997 | scsi_host_put(t: shost); |
2998 | } |
2999 | |
3000 | /** |
3001 | * iscsi_session_setup - create iscsi cls session and host and session |
3002 | * @iscsit: iscsi transport template |
3003 | * @shost: scsi host |
3004 | * @cmds_max: session can queue |
3005 | * @dd_size: private driver data size, added to session allocation size |
3006 | * @cmd_task_size: LLD task private data size |
3007 | * @initial_cmdsn: initial CmdSN |
3008 | * @id: target ID to add to this session |
3009 | * |
3010 | * This can be used by software iscsi_transports that allocate |
3011 | * a session per scsi host. |
3012 | * |
3013 | * Callers should set cmds_max to the largest total numer (mgmt + scsi) of |
3014 | * tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks |
3015 | * for nop handling and login/logout requests. |
3016 | */ |
3017 | struct iscsi_cls_session * |
3018 | iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost, |
3019 | uint16_t cmds_max, int dd_size, int cmd_task_size, |
3020 | uint32_t initial_cmdsn, unsigned int id) |
3021 | { |
3022 | struct iscsi_host *ihost = shost_priv(shost); |
3023 | struct iscsi_session *session; |
3024 | struct iscsi_cls_session *cls_session; |
3025 | int cmd_i, scsi_cmds; |
3026 | unsigned long flags; |
3027 | |
3028 | spin_lock_irqsave(&ihost->lock, flags); |
3029 | if (ihost->state == ISCSI_HOST_REMOVED) { |
3030 | spin_unlock_irqrestore(lock: &ihost->lock, flags); |
3031 | return NULL; |
3032 | } |
3033 | ihost->num_sessions++; |
3034 | spin_unlock_irqrestore(lock: &ihost->lock, flags); |
3035 | |
3036 | scsi_cmds = iscsi_host_get_max_scsi_cmds(shost, cmds_max); |
3037 | if (scsi_cmds < 0) |
3038 | goto dec_session_count; |
3039 | |
3040 | cls_session = iscsi_alloc_session(shost, transport: iscsit, |
3041 | dd_size: sizeof(struct iscsi_session) + |
3042 | dd_size); |
3043 | if (!cls_session) |
3044 | goto dec_session_count; |
3045 | session = cls_session->dd_data; |
3046 | session->cls_session = cls_session; |
3047 | session->host = shost; |
3048 | session->state = ISCSI_STATE_FREE; |
3049 | session->fast_abort = 1; |
3050 | session->tgt_reset_timeout = 30; |
3051 | session->lu_reset_timeout = 15; |
3052 | session->abort_timeout = 10; |
3053 | session->scsi_cmds_max = scsi_cmds; |
3054 | session->cmds_max = scsi_cmds + ISCSI_MGMT_CMDS_MAX; |
3055 | session->queued_cmdsn = session->cmdsn = initial_cmdsn; |
3056 | session->exp_cmdsn = initial_cmdsn + 1; |
3057 | session->max_cmdsn = initial_cmdsn + 1; |
3058 | session->max_r2t = 1; |
3059 | session->tt = iscsit; |
3060 | session->dd_data = cls_session->dd_data + sizeof(*session); |
3061 | |
3062 | session->tmf_state = TMF_INITIAL; |
3063 | timer_setup(&session->tmf_timer, iscsi_tmf_timedout, 0); |
3064 | mutex_init(&session->eh_mutex); |
3065 | init_waitqueue_head(&session->ehwait); |
3066 | |
3067 | spin_lock_init(&session->frwd_lock); |
3068 | spin_lock_init(&session->back_lock); |
3069 | |
3070 | /* initialize SCSI PDU commands pool */ |
3071 | if (iscsi_pool_init(&session->cmdpool, session->cmds_max, |
3072 | (void***)&session->cmds, |
3073 | cmd_task_size + sizeof(struct iscsi_task))) |
3074 | goto cmdpool_alloc_fail; |
3075 | |
3076 | /* pre-format cmds pool with ITT */ |
3077 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { |
3078 | struct iscsi_task *task = session->cmds[cmd_i]; |
3079 | |
3080 | if (cmd_task_size) |
3081 | task->dd_data = &task[1]; |
3082 | task->itt = cmd_i; |
3083 | task->state = ISCSI_TASK_FREE; |
3084 | INIT_LIST_HEAD(list: &task->running); |
3085 | } |
3086 | |
3087 | if (!try_module_get(module: iscsit->owner)) |
3088 | goto module_get_fail; |
3089 | |
3090 | if (iscsi_add_session(session: cls_session, target_id: id)) |
3091 | goto cls_session_fail; |
3092 | |
3093 | return cls_session; |
3094 | |
3095 | cls_session_fail: |
3096 | module_put(module: iscsit->owner); |
3097 | module_get_fail: |
3098 | iscsi_pool_free(&session->cmdpool); |
3099 | cmdpool_alloc_fail: |
3100 | iscsi_free_session(session: cls_session); |
3101 | dec_session_count: |
3102 | iscsi_host_dec_session_cnt(shost); |
3103 | return NULL; |
3104 | } |
3105 | EXPORT_SYMBOL_GPL(iscsi_session_setup); |
3106 | |
3107 | /* |
3108 | * issi_session_remove - Remove session from iSCSI class. |
3109 | */ |
3110 | void iscsi_session_remove(struct iscsi_cls_session *cls_session) |
3111 | { |
3112 | struct iscsi_session *session = cls_session->dd_data; |
3113 | struct Scsi_Host *shost = session->host; |
3114 | |
3115 | iscsi_remove_session(session: cls_session); |
3116 | /* |
3117 | * host removal only has to wait for its children to be removed from |
3118 | * sysfs, and iscsi_tcp needs to do iscsi_host_remove before freeing |
3119 | * the session, so drop the session count here. |
3120 | */ |
3121 | iscsi_host_dec_session_cnt(shost); |
3122 | } |
3123 | EXPORT_SYMBOL_GPL(iscsi_session_remove); |
3124 | |
3125 | /** |
3126 | * iscsi_session_free - Free iscsi session and it's resources |
3127 | * @cls_session: iscsi session |
3128 | */ |
3129 | void iscsi_session_free(struct iscsi_cls_session *cls_session) |
3130 | { |
3131 | struct iscsi_session *session = cls_session->dd_data; |
3132 | struct module *owner = cls_session->transport->owner; |
3133 | |
3134 | iscsi_pool_free(&session->cmdpool); |
3135 | kfree(objp: session->password); |
3136 | kfree(objp: session->password_in); |
3137 | kfree(objp: session->username); |
3138 | kfree(objp: session->username_in); |
3139 | kfree(objp: session->targetname); |
3140 | kfree(objp: session->targetalias); |
3141 | kfree(objp: session->initiatorname); |
3142 | kfree(objp: session->boot_root); |
3143 | kfree(objp: session->boot_nic); |
3144 | kfree(objp: session->boot_target); |
3145 | kfree(objp: session->ifacename); |
3146 | kfree(objp: session->portal_type); |
3147 | kfree(objp: session->discovery_parent_type); |
3148 | |
3149 | iscsi_free_session(session: cls_session); |
3150 | module_put(module: owner); |
3151 | } |
3152 | EXPORT_SYMBOL_GPL(iscsi_session_free); |
3153 | |
3154 | /** |
3155 | * iscsi_session_teardown - destroy session and cls_session |
3156 | * @cls_session: iscsi session |
3157 | */ |
3158 | void iscsi_session_teardown(struct iscsi_cls_session *cls_session) |
3159 | { |
3160 | iscsi_session_remove(cls_session); |
3161 | iscsi_session_free(cls_session); |
3162 | } |
3163 | EXPORT_SYMBOL_GPL(iscsi_session_teardown); |
3164 | |
3165 | /** |
3166 | * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn |
3167 | * @cls_session: iscsi_cls_session |
3168 | * @dd_size: private driver data size |
3169 | * @conn_idx: cid |
3170 | */ |
3171 | struct iscsi_cls_conn * |
3172 | iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size, |
3173 | uint32_t conn_idx) |
3174 | { |
3175 | struct iscsi_session *session = cls_session->dd_data; |
3176 | struct iscsi_conn *conn; |
3177 | struct iscsi_cls_conn *cls_conn; |
3178 | char *data; |
3179 | int err; |
3180 | |
3181 | cls_conn = iscsi_alloc_conn(sess: cls_session, dd_size: sizeof(*conn) + dd_size, |
3182 | cid: conn_idx); |
3183 | if (!cls_conn) |
3184 | return NULL; |
3185 | conn = cls_conn->dd_data; |
3186 | |
3187 | conn->dd_data = cls_conn->dd_data + sizeof(*conn); |
3188 | conn->session = session; |
3189 | conn->cls_conn = cls_conn; |
3190 | conn->c_stage = ISCSI_CONN_INITIAL_STAGE; |
3191 | conn->id = conn_idx; |
3192 | conn->exp_statsn = 0; |
3193 | |
3194 | timer_setup(&conn->transport_timer, iscsi_check_transport_timeouts, 0); |
3195 | |
3196 | INIT_LIST_HEAD(list: &conn->mgmtqueue); |
3197 | INIT_LIST_HEAD(list: &conn->cmdqueue); |
3198 | INIT_LIST_HEAD(list: &conn->requeue); |
3199 | INIT_WORK(&conn->xmitwork, iscsi_xmitworker); |
3200 | |
3201 | /* allocate login_task used for the login/text sequences */ |
3202 | spin_lock_bh(lock: &session->frwd_lock); |
3203 | if (!kfifo_out(&session->cmdpool.queue, |
3204 | (void*)&conn->login_task, |
3205 | sizeof(void*))) { |
3206 | spin_unlock_bh(lock: &session->frwd_lock); |
3207 | goto login_task_alloc_fail; |
3208 | } |
3209 | spin_unlock_bh(lock: &session->frwd_lock); |
3210 | |
3211 | data = (char *) __get_free_pages(GFP_KERNEL, |
3212 | order: get_order(ISCSI_DEF_MAX_RECV_SEG_LEN)); |
3213 | if (!data) |
3214 | goto login_task_data_alloc_fail; |
3215 | conn->login_task->data = conn->data = data; |
3216 | |
3217 | err = iscsi_add_conn(conn: cls_conn); |
3218 | if (err) |
3219 | goto login_task_add_dev_fail; |
3220 | |
3221 | return cls_conn; |
3222 | |
3223 | login_task_add_dev_fail: |
3224 | free_pages(addr: (unsigned long) conn->data, |
3225 | order: get_order(ISCSI_DEF_MAX_RECV_SEG_LEN)); |
3226 | |
3227 | login_task_data_alloc_fail: |
3228 | kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task, |
3229 | sizeof(void*)); |
3230 | login_task_alloc_fail: |
3231 | iscsi_put_conn(conn: cls_conn); |
3232 | return NULL; |
3233 | } |
3234 | EXPORT_SYMBOL_GPL(iscsi_conn_setup); |
3235 | |
3236 | /** |
3237 | * iscsi_conn_teardown - teardown iscsi connection |
3238 | * @cls_conn: iscsi class connection |
3239 | * |
3240 | * TODO: we may need to make this into a two step process |
3241 | * like scsi-mls remove + put host |
3242 | */ |
3243 | void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn) |
3244 | { |
3245 | struct iscsi_conn *conn = cls_conn->dd_data; |
3246 | struct iscsi_session *session = conn->session; |
3247 | |
3248 | iscsi_remove_conn(conn: cls_conn); |
3249 | |
3250 | del_timer_sync(timer: &conn->transport_timer); |
3251 | |
3252 | mutex_lock(&session->eh_mutex); |
3253 | spin_lock_bh(lock: &session->frwd_lock); |
3254 | conn->c_stage = ISCSI_CONN_CLEANUP_WAIT; |
3255 | if (session->leadconn == conn) { |
3256 | /* |
3257 | * leading connection? then give up on recovery. |
3258 | */ |
3259 | session->state = ISCSI_STATE_TERMINATE; |
3260 | wake_up(&session->ehwait); |
3261 | } |
3262 | spin_unlock_bh(lock: &session->frwd_lock); |
3263 | |
3264 | /* flush queued up work because we free the connection below */ |
3265 | iscsi_suspend_tx(conn); |
3266 | |
3267 | spin_lock_bh(lock: &session->frwd_lock); |
3268 | free_pages(addr: (unsigned long) conn->data, |
3269 | order: get_order(ISCSI_DEF_MAX_RECV_SEG_LEN)); |
3270 | kfree(objp: conn->persistent_address); |
3271 | kfree(objp: conn->local_ipaddr); |
3272 | /* regular RX path uses back_lock */ |
3273 | spin_lock_bh(lock: &session->back_lock); |
3274 | kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task, |
3275 | sizeof(void*)); |
3276 | spin_unlock_bh(lock: &session->back_lock); |
3277 | if (session->leadconn == conn) |
3278 | session->leadconn = NULL; |
3279 | spin_unlock_bh(lock: &session->frwd_lock); |
3280 | mutex_unlock(lock: &session->eh_mutex); |
3281 | |
3282 | iscsi_put_conn(conn: cls_conn); |
3283 | } |
3284 | EXPORT_SYMBOL_GPL(iscsi_conn_teardown); |
3285 | |
3286 | int iscsi_conn_start(struct iscsi_cls_conn *cls_conn) |
3287 | { |
3288 | struct iscsi_conn *conn = cls_conn->dd_data; |
3289 | struct iscsi_session *session = conn->session; |
3290 | |
3291 | if (!session) { |
3292 | iscsi_conn_printk(KERN_ERR, conn, |
3293 | "can't start unbound connection\n" ); |
3294 | return -EPERM; |
3295 | } |
3296 | |
3297 | if ((session->imm_data_en || !session->initial_r2t_en) && |
3298 | session->first_burst > session->max_burst) { |
3299 | iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: " |
3300 | "first_burst %d max_burst %d\n" , |
3301 | session->first_burst, session->max_burst); |
3302 | return -EINVAL; |
3303 | } |
3304 | |
3305 | if (conn->ping_timeout && !conn->recv_timeout) { |
3306 | iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of " |
3307 | "zero. Using 5 seconds\n." ); |
3308 | conn->recv_timeout = 5; |
3309 | } |
3310 | |
3311 | if (conn->recv_timeout && !conn->ping_timeout) { |
3312 | iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of " |
3313 | "zero. Using 5 seconds.\n" ); |
3314 | conn->ping_timeout = 5; |
3315 | } |
3316 | |
3317 | spin_lock_bh(lock: &session->frwd_lock); |
3318 | conn->c_stage = ISCSI_CONN_STARTED; |
3319 | session->state = ISCSI_STATE_LOGGED_IN; |
3320 | session->queued_cmdsn = session->cmdsn; |
3321 | |
3322 | conn->last_recv = jiffies; |
3323 | conn->last_ping = jiffies; |
3324 | if (conn->recv_timeout && conn->ping_timeout) |
3325 | mod_timer(timer: &conn->transport_timer, |
3326 | expires: jiffies + (conn->recv_timeout * HZ)); |
3327 | |
3328 | switch(conn->stop_stage) { |
3329 | case STOP_CONN_RECOVER: |
3330 | /* |
3331 | * unblock eh_abort() if it is blocked. re-try all |
3332 | * commands after successful recovery |
3333 | */ |
3334 | conn->stop_stage = 0; |
3335 | session->tmf_state = TMF_INITIAL; |
3336 | session->age++; |
3337 | if (session->age == 16) |
3338 | session->age = 0; |
3339 | break; |
3340 | case STOP_CONN_TERM: |
3341 | conn->stop_stage = 0; |
3342 | break; |
3343 | default: |
3344 | break; |
3345 | } |
3346 | spin_unlock_bh(lock: &session->frwd_lock); |
3347 | |
3348 | iscsi_unblock_session(session: session->cls_session); |
3349 | wake_up(&session->ehwait); |
3350 | return 0; |
3351 | } |
3352 | EXPORT_SYMBOL_GPL(iscsi_conn_start); |
3353 | |
3354 | static void |
3355 | fail_mgmt_tasks(struct iscsi_session *session, struct iscsi_conn *conn) |
3356 | { |
3357 | struct iscsi_task *task; |
3358 | int i, state; |
3359 | |
3360 | for (i = 0; i < conn->session->cmds_max; i++) { |
3361 | task = conn->session->cmds[i]; |
3362 | if (task->sc) |
3363 | continue; |
3364 | |
3365 | if (task->state == ISCSI_TASK_FREE) |
3366 | continue; |
3367 | |
3368 | ISCSI_DBG_SESSION(conn->session, |
3369 | "failing mgmt itt 0x%x state %d\n" , |
3370 | task->itt, task->state); |
3371 | |
3372 | spin_lock_bh(lock: &session->back_lock); |
3373 | if (cleanup_queued_task(task)) { |
3374 | spin_unlock_bh(lock: &session->back_lock); |
3375 | continue; |
3376 | } |
3377 | |
3378 | state = ISCSI_TASK_ABRT_SESS_RECOV; |
3379 | if (task->state == ISCSI_TASK_PENDING) |
3380 | state = ISCSI_TASK_COMPLETED; |
3381 | iscsi_complete_task(task, state); |
3382 | spin_unlock_bh(lock: &session->back_lock); |
3383 | } |
3384 | } |
3385 | |
3386 | void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) |
3387 | { |
3388 | struct iscsi_conn *conn = cls_conn->dd_data; |
3389 | struct iscsi_session *session = conn->session; |
3390 | int old_stop_stage; |
3391 | |
3392 | mutex_lock(&session->eh_mutex); |
3393 | spin_lock_bh(lock: &session->frwd_lock); |
3394 | if (conn->stop_stage == STOP_CONN_TERM) { |
3395 | spin_unlock_bh(lock: &session->frwd_lock); |
3396 | mutex_unlock(lock: &session->eh_mutex); |
3397 | return; |
3398 | } |
3399 | |
3400 | /* |
3401 | * When this is called for the in_login state, we only want to clean |
3402 | * up the login task and connection. We do not need to block and set |
3403 | * the recovery state again |
3404 | */ |
3405 | if (flag == STOP_CONN_TERM) |
3406 | session->state = ISCSI_STATE_TERMINATE; |
3407 | else if (conn->stop_stage != STOP_CONN_RECOVER) |
3408 | session->state = ISCSI_STATE_IN_RECOVERY; |
3409 | |
3410 | old_stop_stage = conn->stop_stage; |
3411 | conn->stop_stage = flag; |
3412 | spin_unlock_bh(lock: &session->frwd_lock); |
3413 | |
3414 | del_timer_sync(timer: &conn->transport_timer); |
3415 | iscsi_suspend_tx(conn); |
3416 | |
3417 | spin_lock_bh(lock: &session->frwd_lock); |
3418 | conn->c_stage = ISCSI_CONN_STOPPED; |
3419 | spin_unlock_bh(lock: &session->frwd_lock); |
3420 | |
3421 | /* |
3422 | * for connection level recovery we should not calculate |
3423 | * header digest. conn->hdr_size used for optimization |
3424 | * in hdr_extract() and will be re-negotiated at |
3425 | * set_param() time. |
3426 | */ |
3427 | if (flag == STOP_CONN_RECOVER) { |
3428 | conn->hdrdgst_en = 0; |
3429 | conn->datadgst_en = 0; |
3430 | if (session->state == ISCSI_STATE_IN_RECOVERY && |
3431 | old_stop_stage != STOP_CONN_RECOVER) { |
3432 | ISCSI_DBG_SESSION(session, "blocking session\n" ); |
3433 | iscsi_block_session(session: session->cls_session); |
3434 | } |
3435 | } |
3436 | |
3437 | /* |
3438 | * flush queues. |
3439 | */ |
3440 | spin_lock_bh(lock: &session->frwd_lock); |
3441 | fail_scsi_tasks(conn, lun: -1, error: DID_TRANSPORT_DISRUPTED); |
3442 | fail_mgmt_tasks(session, conn); |
3443 | memset(&session->tmhdr, 0, sizeof(session->tmhdr)); |
3444 | spin_unlock_bh(lock: &session->frwd_lock); |
3445 | mutex_unlock(lock: &session->eh_mutex); |
3446 | } |
3447 | EXPORT_SYMBOL_GPL(iscsi_conn_stop); |
3448 | |
3449 | int iscsi_conn_bind(struct iscsi_cls_session *cls_session, |
3450 | struct iscsi_cls_conn *cls_conn, int is_leading) |
3451 | { |
3452 | struct iscsi_session *session = cls_session->dd_data; |
3453 | struct iscsi_conn *conn = cls_conn->dd_data; |
3454 | |
3455 | spin_lock_bh(lock: &session->frwd_lock); |
3456 | if (is_leading) |
3457 | session->leadconn = conn; |
3458 | |
3459 | set_bit(ISCSI_CONN_FLAG_BOUND, addr: &conn->flags); |
3460 | spin_unlock_bh(lock: &session->frwd_lock); |
3461 | |
3462 | /* |
3463 | * The target could have reduced it's window size between logins, so |
3464 | * we have to reset max/exp cmdsn so we can see the new values. |
3465 | */ |
3466 | spin_lock_bh(lock: &session->back_lock); |
3467 | session->max_cmdsn = session->exp_cmdsn = session->cmdsn + 1; |
3468 | spin_unlock_bh(lock: &session->back_lock); |
3469 | /* |
3470 | * Unblock xmitworker(), Login Phase will pass through. |
3471 | */ |
3472 | clear_bit(ISCSI_CONN_FLAG_SUSPEND_RX, addr: &conn->flags); |
3473 | clear_bit(ISCSI_CONN_FLAG_SUSPEND_TX, addr: &conn->flags); |
3474 | return 0; |
3475 | } |
3476 | EXPORT_SYMBOL_GPL(iscsi_conn_bind); |
3477 | |
3478 | int iscsi_switch_str_param(char **param, char *new_val_buf) |
3479 | { |
3480 | char *new_val; |
3481 | |
3482 | if (*param) { |
3483 | if (!strcmp(*param, new_val_buf)) |
3484 | return 0; |
3485 | } |
3486 | |
3487 | new_val = kstrdup(s: new_val_buf, GFP_NOIO); |
3488 | if (!new_val) |
3489 | return -ENOMEM; |
3490 | |
3491 | kfree(objp: *param); |
3492 | *param = new_val; |
3493 | return 0; |
3494 | } |
3495 | EXPORT_SYMBOL_GPL(iscsi_switch_str_param); |
3496 | |
3497 | int iscsi_set_param(struct iscsi_cls_conn *cls_conn, |
3498 | enum iscsi_param param, char *buf, int buflen) |
3499 | { |
3500 | struct iscsi_conn *conn = cls_conn->dd_data; |
3501 | struct iscsi_session *session = conn->session; |
3502 | int val; |
3503 | |
3504 | switch(param) { |
3505 | case ISCSI_PARAM_FAST_ABORT: |
3506 | sscanf(buf, "%d" , &session->fast_abort); |
3507 | break; |
3508 | case ISCSI_PARAM_ABORT_TMO: |
3509 | sscanf(buf, "%d" , &session->abort_timeout); |
3510 | break; |
3511 | case ISCSI_PARAM_LU_RESET_TMO: |
3512 | sscanf(buf, "%d" , &session->lu_reset_timeout); |
3513 | break; |
3514 | case ISCSI_PARAM_TGT_RESET_TMO: |
3515 | sscanf(buf, "%d" , &session->tgt_reset_timeout); |
3516 | break; |
3517 | case ISCSI_PARAM_PING_TMO: |
3518 | sscanf(buf, "%d" , &conn->ping_timeout); |
3519 | break; |
3520 | case ISCSI_PARAM_RECV_TMO: |
3521 | sscanf(buf, "%d" , &conn->recv_timeout); |
3522 | break; |
3523 | case ISCSI_PARAM_MAX_RECV_DLENGTH: |
3524 | sscanf(buf, "%d" , &conn->max_recv_dlength); |
3525 | break; |
3526 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: |
3527 | sscanf(buf, "%d" , &conn->max_xmit_dlength); |
3528 | break; |
3529 | case ISCSI_PARAM_HDRDGST_EN: |
3530 | sscanf(buf, "%d" , &conn->hdrdgst_en); |
3531 | break; |
3532 | case ISCSI_PARAM_DATADGST_EN: |
3533 | sscanf(buf, "%d" , &conn->datadgst_en); |
3534 | break; |
3535 | case ISCSI_PARAM_INITIAL_R2T_EN: |
3536 | sscanf(buf, "%d" , &session->initial_r2t_en); |
3537 | break; |
3538 | case ISCSI_PARAM_MAX_R2T: |
3539 | sscanf(buf, "%hu" , &session->max_r2t); |
3540 | break; |
3541 | case ISCSI_PARAM_IMM_DATA_EN: |
3542 | sscanf(buf, "%d" , &session->imm_data_en); |
3543 | break; |
3544 | case ISCSI_PARAM_FIRST_BURST: |
3545 | sscanf(buf, "%d" , &session->first_burst); |
3546 | break; |
3547 | case ISCSI_PARAM_MAX_BURST: |
3548 | sscanf(buf, "%d" , &session->max_burst); |
3549 | break; |
3550 | case ISCSI_PARAM_PDU_INORDER_EN: |
3551 | sscanf(buf, "%d" , &session->pdu_inorder_en); |
3552 | break; |
3553 | case ISCSI_PARAM_DATASEQ_INORDER_EN: |
3554 | sscanf(buf, "%d" , &session->dataseq_inorder_en); |
3555 | break; |
3556 | case ISCSI_PARAM_ERL: |
3557 | sscanf(buf, "%d" , &session->erl); |
3558 | break; |
3559 | case ISCSI_PARAM_EXP_STATSN: |
3560 | sscanf(buf, "%u" , &conn->exp_statsn); |
3561 | break; |
3562 | case ISCSI_PARAM_USERNAME: |
3563 | return iscsi_switch_str_param(&session->username, buf); |
3564 | case ISCSI_PARAM_USERNAME_IN: |
3565 | return iscsi_switch_str_param(&session->username_in, buf); |
3566 | case ISCSI_PARAM_PASSWORD: |
3567 | return iscsi_switch_str_param(&session->password, buf); |
3568 | case ISCSI_PARAM_PASSWORD_IN: |
3569 | return iscsi_switch_str_param(&session->password_in, buf); |
3570 | case ISCSI_PARAM_TARGET_NAME: |
3571 | return iscsi_switch_str_param(&session->targetname, buf); |
3572 | case ISCSI_PARAM_TARGET_ALIAS: |
3573 | return iscsi_switch_str_param(&session->targetalias, buf); |
3574 | case ISCSI_PARAM_TPGT: |
3575 | sscanf(buf, "%d" , &session->tpgt); |
3576 | break; |
3577 | case ISCSI_PARAM_PERSISTENT_PORT: |
3578 | sscanf(buf, "%d" , &conn->persistent_port); |
3579 | break; |
3580 | case ISCSI_PARAM_PERSISTENT_ADDRESS: |
3581 | return iscsi_switch_str_param(&conn->persistent_address, buf); |
3582 | case ISCSI_PARAM_IFACE_NAME: |
3583 | return iscsi_switch_str_param(&session->ifacename, buf); |
3584 | case ISCSI_PARAM_INITIATOR_NAME: |
3585 | return iscsi_switch_str_param(&session->initiatorname, buf); |
3586 | case ISCSI_PARAM_BOOT_ROOT: |
3587 | return iscsi_switch_str_param(&session->boot_root, buf); |
3588 | case ISCSI_PARAM_BOOT_NIC: |
3589 | return iscsi_switch_str_param(&session->boot_nic, buf); |
3590 | case ISCSI_PARAM_BOOT_TARGET: |
3591 | return iscsi_switch_str_param(&session->boot_target, buf); |
3592 | case ISCSI_PARAM_PORTAL_TYPE: |
3593 | return iscsi_switch_str_param(&session->portal_type, buf); |
3594 | case ISCSI_PARAM_DISCOVERY_PARENT_TYPE: |
3595 | return iscsi_switch_str_param(&session->discovery_parent_type, |
3596 | buf); |
3597 | case ISCSI_PARAM_DISCOVERY_SESS: |
3598 | sscanf(buf, "%d" , &val); |
3599 | session->discovery_sess = !!val; |
3600 | break; |
3601 | case ISCSI_PARAM_LOCAL_IPADDR: |
3602 | return iscsi_switch_str_param(&conn->local_ipaddr, buf); |
3603 | default: |
3604 | return -ENOSYS; |
3605 | } |
3606 | |
3607 | return 0; |
3608 | } |
3609 | EXPORT_SYMBOL_GPL(iscsi_set_param); |
3610 | |
3611 | int iscsi_session_get_param(struct iscsi_cls_session *cls_session, |
3612 | enum iscsi_param param, char *buf) |
3613 | { |
3614 | struct iscsi_session *session = cls_session->dd_data; |
3615 | int len; |
3616 | |
3617 | switch(param) { |
3618 | case ISCSI_PARAM_FAST_ABORT: |
3619 | len = sysfs_emit(buf, fmt: "%d\n" , session->fast_abort); |
3620 | break; |
3621 | case ISCSI_PARAM_ABORT_TMO: |
3622 | len = sysfs_emit(buf, fmt: "%d\n" , session->abort_timeout); |
3623 | break; |
3624 | case ISCSI_PARAM_LU_RESET_TMO: |
3625 | len = sysfs_emit(buf, fmt: "%d\n" , session->lu_reset_timeout); |
3626 | break; |
3627 | case ISCSI_PARAM_TGT_RESET_TMO: |
3628 | len = sysfs_emit(buf, fmt: "%d\n" , session->tgt_reset_timeout); |
3629 | break; |
3630 | case ISCSI_PARAM_INITIAL_R2T_EN: |
3631 | len = sysfs_emit(buf, fmt: "%d\n" , session->initial_r2t_en); |
3632 | break; |
3633 | case ISCSI_PARAM_MAX_R2T: |
3634 | len = sysfs_emit(buf, fmt: "%hu\n" , session->max_r2t); |
3635 | break; |
3636 | case ISCSI_PARAM_IMM_DATA_EN: |
3637 | len = sysfs_emit(buf, fmt: "%d\n" , session->imm_data_en); |
3638 | break; |
3639 | case ISCSI_PARAM_FIRST_BURST: |
3640 | len = sysfs_emit(buf, fmt: "%u\n" , session->first_burst); |
3641 | break; |
3642 | case ISCSI_PARAM_MAX_BURST: |
3643 | len = sysfs_emit(buf, fmt: "%u\n" , session->max_burst); |
3644 | break; |
3645 | case ISCSI_PARAM_PDU_INORDER_EN: |
3646 | len = sysfs_emit(buf, fmt: "%d\n" , session->pdu_inorder_en); |
3647 | break; |
3648 | case ISCSI_PARAM_DATASEQ_INORDER_EN: |
3649 | len = sysfs_emit(buf, fmt: "%d\n" , session->dataseq_inorder_en); |
3650 | break; |
3651 | case ISCSI_PARAM_DEF_TASKMGMT_TMO: |
3652 | len = sysfs_emit(buf, fmt: "%d\n" , session->def_taskmgmt_tmo); |
3653 | break; |
3654 | case ISCSI_PARAM_ERL: |
3655 | len = sysfs_emit(buf, fmt: "%d\n" , session->erl); |
3656 | break; |
3657 | case ISCSI_PARAM_TARGET_NAME: |
3658 | len = sysfs_emit(buf, fmt: "%s\n" , session->targetname); |
3659 | break; |
3660 | case ISCSI_PARAM_TARGET_ALIAS: |
3661 | len = sysfs_emit(buf, fmt: "%s\n" , session->targetalias); |
3662 | break; |
3663 | case ISCSI_PARAM_TPGT: |
3664 | len = sysfs_emit(buf, fmt: "%d\n" , session->tpgt); |
3665 | break; |
3666 | case ISCSI_PARAM_USERNAME: |
3667 | len = sysfs_emit(buf, fmt: "%s\n" , session->username); |
3668 | break; |
3669 | case ISCSI_PARAM_USERNAME_IN: |
3670 | len = sysfs_emit(buf, fmt: "%s\n" , session->username_in); |
3671 | break; |
3672 | case ISCSI_PARAM_PASSWORD: |
3673 | len = sysfs_emit(buf, fmt: "%s\n" , session->password); |
3674 | break; |
3675 | case ISCSI_PARAM_PASSWORD_IN: |
3676 | len = sysfs_emit(buf, fmt: "%s\n" , session->password_in); |
3677 | break; |
3678 | case ISCSI_PARAM_IFACE_NAME: |
3679 | len = sysfs_emit(buf, fmt: "%s\n" , session->ifacename); |
3680 | break; |
3681 | case ISCSI_PARAM_INITIATOR_NAME: |
3682 | len = sysfs_emit(buf, fmt: "%s\n" , session->initiatorname); |
3683 | break; |
3684 | case ISCSI_PARAM_BOOT_ROOT: |
3685 | len = sysfs_emit(buf, fmt: "%s\n" , session->boot_root); |
3686 | break; |
3687 | case ISCSI_PARAM_BOOT_NIC: |
3688 | len = sysfs_emit(buf, fmt: "%s\n" , session->boot_nic); |
3689 | break; |
3690 | case ISCSI_PARAM_BOOT_TARGET: |
3691 | len = sysfs_emit(buf, fmt: "%s\n" , session->boot_target); |
3692 | break; |
3693 | case ISCSI_PARAM_AUTO_SND_TGT_DISABLE: |
3694 | len = sysfs_emit(buf, fmt: "%u\n" , session->auto_snd_tgt_disable); |
3695 | break; |
3696 | case ISCSI_PARAM_DISCOVERY_SESS: |
3697 | len = sysfs_emit(buf, fmt: "%u\n" , session->discovery_sess); |
3698 | break; |
3699 | case ISCSI_PARAM_PORTAL_TYPE: |
3700 | len = sysfs_emit(buf, fmt: "%s\n" , session->portal_type); |
3701 | break; |
3702 | case ISCSI_PARAM_CHAP_AUTH_EN: |
3703 | len = sysfs_emit(buf, fmt: "%u\n" , session->chap_auth_en); |
3704 | break; |
3705 | case ISCSI_PARAM_DISCOVERY_LOGOUT_EN: |
3706 | len = sysfs_emit(buf, fmt: "%u\n" , session->discovery_logout_en); |
3707 | break; |
3708 | case ISCSI_PARAM_BIDI_CHAP_EN: |
3709 | len = sysfs_emit(buf, fmt: "%u\n" , session->bidi_chap_en); |
3710 | break; |
3711 | case ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL: |
3712 | len = sysfs_emit(buf, fmt: "%u\n" , session->discovery_auth_optional); |
3713 | break; |
3714 | case ISCSI_PARAM_DEF_TIME2WAIT: |
3715 | len = sysfs_emit(buf, fmt: "%d\n" , session->time2wait); |
3716 | break; |
3717 | case ISCSI_PARAM_DEF_TIME2RETAIN: |
3718 | len = sysfs_emit(buf, fmt: "%d\n" , session->time2retain); |
3719 | break; |
3720 | case ISCSI_PARAM_TSID: |
3721 | len = sysfs_emit(buf, fmt: "%u\n" , session->tsid); |
3722 | break; |
3723 | case ISCSI_PARAM_ISID: |
3724 | len = sysfs_emit(buf, fmt: "%02x%02x%02x%02x%02x%02x\n" , |
3725 | session->isid[0], session->isid[1], |
3726 | session->isid[2], session->isid[3], |
3727 | session->isid[4], session->isid[5]); |
3728 | break; |
3729 | case ISCSI_PARAM_DISCOVERY_PARENT_IDX: |
3730 | len = sysfs_emit(buf, fmt: "%u\n" , session->discovery_parent_idx); |
3731 | break; |
3732 | case ISCSI_PARAM_DISCOVERY_PARENT_TYPE: |
3733 | if (session->discovery_parent_type) |
3734 | len = sysfs_emit(buf, fmt: "%s\n" , |
3735 | session->discovery_parent_type); |
3736 | else |
3737 | len = sysfs_emit(buf, fmt: "\n" ); |
3738 | break; |
3739 | default: |
3740 | return -ENOSYS; |
3741 | } |
3742 | |
3743 | return len; |
3744 | } |
3745 | EXPORT_SYMBOL_GPL(iscsi_session_get_param); |
3746 | |
3747 | int iscsi_conn_get_addr_param(struct sockaddr_storage *addr, |
3748 | enum iscsi_param param, char *buf) |
3749 | { |
3750 | struct sockaddr_in6 *sin6 = NULL; |
3751 | struct sockaddr_in *sin = NULL; |
3752 | int len; |
3753 | |
3754 | switch (addr->ss_family) { |
3755 | case AF_INET: |
3756 | sin = (struct sockaddr_in *)addr; |
3757 | break; |
3758 | case AF_INET6: |
3759 | sin6 = (struct sockaddr_in6 *)addr; |
3760 | break; |
3761 | default: |
3762 | return -EINVAL; |
3763 | } |
3764 | |
3765 | switch (param) { |
3766 | case ISCSI_PARAM_CONN_ADDRESS: |
3767 | case ISCSI_HOST_PARAM_IPADDRESS: |
3768 | if (sin) |
3769 | len = sysfs_emit(buf, fmt: "%pI4\n" , &sin->sin_addr.s_addr); |
3770 | else |
3771 | len = sysfs_emit(buf, fmt: "%pI6\n" , &sin6->sin6_addr); |
3772 | break; |
3773 | case ISCSI_PARAM_CONN_PORT: |
3774 | case ISCSI_PARAM_LOCAL_PORT: |
3775 | if (sin) |
3776 | len = sysfs_emit(buf, fmt: "%hu\n" , be16_to_cpu(sin->sin_port)); |
3777 | else |
3778 | len = sysfs_emit(buf, fmt: "%hu\n" , |
3779 | be16_to_cpu(sin6->sin6_port)); |
3780 | break; |
3781 | default: |
3782 | return -EINVAL; |
3783 | } |
3784 | |
3785 | return len; |
3786 | } |
3787 | EXPORT_SYMBOL_GPL(iscsi_conn_get_addr_param); |
3788 | |
3789 | int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn, |
3790 | enum iscsi_param param, char *buf) |
3791 | { |
3792 | struct iscsi_conn *conn = cls_conn->dd_data; |
3793 | int len; |
3794 | |
3795 | switch(param) { |
3796 | case ISCSI_PARAM_PING_TMO: |
3797 | len = sysfs_emit(buf, fmt: "%u\n" , conn->ping_timeout); |
3798 | break; |
3799 | case ISCSI_PARAM_RECV_TMO: |
3800 | len = sysfs_emit(buf, fmt: "%u\n" , conn->recv_timeout); |
3801 | break; |
3802 | case ISCSI_PARAM_MAX_RECV_DLENGTH: |
3803 | len = sysfs_emit(buf, fmt: "%u\n" , conn->max_recv_dlength); |
3804 | break; |
3805 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: |
3806 | len = sysfs_emit(buf, fmt: "%u\n" , conn->max_xmit_dlength); |
3807 | break; |
3808 | case ISCSI_PARAM_HDRDGST_EN: |
3809 | len = sysfs_emit(buf, fmt: "%d\n" , conn->hdrdgst_en); |
3810 | break; |
3811 | case ISCSI_PARAM_DATADGST_EN: |
3812 | len = sysfs_emit(buf, fmt: "%d\n" , conn->datadgst_en); |
3813 | break; |
3814 | case ISCSI_PARAM_IFMARKER_EN: |
3815 | len = sysfs_emit(buf, fmt: "%d\n" , conn->ifmarker_en); |
3816 | break; |
3817 | case ISCSI_PARAM_OFMARKER_EN: |
3818 | len = sysfs_emit(buf, fmt: "%d\n" , conn->ofmarker_en); |
3819 | break; |
3820 | case ISCSI_PARAM_EXP_STATSN: |
3821 | len = sysfs_emit(buf, fmt: "%u\n" , conn->exp_statsn); |
3822 | break; |
3823 | case ISCSI_PARAM_PERSISTENT_PORT: |
3824 | len = sysfs_emit(buf, fmt: "%d\n" , conn->persistent_port); |
3825 | break; |
3826 | case ISCSI_PARAM_PERSISTENT_ADDRESS: |
3827 | len = sysfs_emit(buf, fmt: "%s\n" , conn->persistent_address); |
3828 | break; |
3829 | case ISCSI_PARAM_STATSN: |
3830 | len = sysfs_emit(buf, fmt: "%u\n" , conn->statsn); |
3831 | break; |
3832 | case ISCSI_PARAM_MAX_SEGMENT_SIZE: |
3833 | len = sysfs_emit(buf, fmt: "%u\n" , conn->max_segment_size); |
3834 | break; |
3835 | case ISCSI_PARAM_KEEPALIVE_TMO: |
3836 | len = sysfs_emit(buf, fmt: "%u\n" , conn->keepalive_tmo); |
3837 | break; |
3838 | case ISCSI_PARAM_LOCAL_PORT: |
3839 | len = sysfs_emit(buf, fmt: "%u\n" , conn->local_port); |
3840 | break; |
3841 | case ISCSI_PARAM_TCP_TIMESTAMP_STAT: |
3842 | len = sysfs_emit(buf, fmt: "%u\n" , conn->tcp_timestamp_stat); |
3843 | break; |
3844 | case ISCSI_PARAM_TCP_NAGLE_DISABLE: |
3845 | len = sysfs_emit(buf, fmt: "%u\n" , conn->tcp_nagle_disable); |
3846 | break; |
3847 | case ISCSI_PARAM_TCP_WSF_DISABLE: |
3848 | len = sysfs_emit(buf, fmt: "%u\n" , conn->tcp_wsf_disable); |
3849 | break; |
3850 | case ISCSI_PARAM_TCP_TIMER_SCALE: |
3851 | len = sysfs_emit(buf, fmt: "%u\n" , conn->tcp_timer_scale); |
3852 | break; |
3853 | case ISCSI_PARAM_TCP_TIMESTAMP_EN: |
3854 | len = sysfs_emit(buf, fmt: "%u\n" , conn->tcp_timestamp_en); |
3855 | break; |
3856 | case ISCSI_PARAM_IP_FRAGMENT_DISABLE: |
3857 | len = sysfs_emit(buf, fmt: "%u\n" , conn->fragment_disable); |
3858 | break; |
3859 | case ISCSI_PARAM_IPV4_TOS: |
3860 | len = sysfs_emit(buf, fmt: "%u\n" , conn->ipv4_tos); |
3861 | break; |
3862 | case ISCSI_PARAM_IPV6_TC: |
3863 | len = sysfs_emit(buf, fmt: "%u\n" , conn->ipv6_traffic_class); |
3864 | break; |
3865 | case ISCSI_PARAM_IPV6_FLOW_LABEL: |
3866 | len = sysfs_emit(buf, fmt: "%u\n" , conn->ipv6_flow_label); |
3867 | break; |
3868 | case ISCSI_PARAM_IS_FW_ASSIGNED_IPV6: |
3869 | len = sysfs_emit(buf, fmt: "%u\n" , conn->is_fw_assigned_ipv6); |
3870 | break; |
3871 | case ISCSI_PARAM_TCP_XMIT_WSF: |
3872 | len = sysfs_emit(buf, fmt: "%u\n" , conn->tcp_xmit_wsf); |
3873 | break; |
3874 | case ISCSI_PARAM_TCP_RECV_WSF: |
3875 | len = sysfs_emit(buf, fmt: "%u\n" , conn->tcp_recv_wsf); |
3876 | break; |
3877 | case ISCSI_PARAM_LOCAL_IPADDR: |
3878 | len = sysfs_emit(buf, fmt: "%s\n" , conn->local_ipaddr); |
3879 | break; |
3880 | default: |
3881 | return -ENOSYS; |
3882 | } |
3883 | |
3884 | return len; |
3885 | } |
3886 | EXPORT_SYMBOL_GPL(iscsi_conn_get_param); |
3887 | |
3888 | int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param, |
3889 | char *buf) |
3890 | { |
3891 | struct iscsi_host *ihost = shost_priv(shost); |
3892 | int len; |
3893 | |
3894 | switch (param) { |
3895 | case ISCSI_HOST_PARAM_NETDEV_NAME: |
3896 | len = sysfs_emit(buf, fmt: "%s\n" , ihost->netdev); |
3897 | break; |
3898 | case ISCSI_HOST_PARAM_HWADDRESS: |
3899 | len = sysfs_emit(buf, fmt: "%s\n" , ihost->hwaddress); |
3900 | break; |
3901 | case ISCSI_HOST_PARAM_INITIATOR_NAME: |
3902 | len = sysfs_emit(buf, fmt: "%s\n" , ihost->initiatorname); |
3903 | break; |
3904 | default: |
3905 | return -ENOSYS; |
3906 | } |
3907 | |
3908 | return len; |
3909 | } |
3910 | EXPORT_SYMBOL_GPL(iscsi_host_get_param); |
3911 | |
3912 | int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param, |
3913 | char *buf, int buflen) |
3914 | { |
3915 | struct iscsi_host *ihost = shost_priv(shost); |
3916 | |
3917 | switch (param) { |
3918 | case ISCSI_HOST_PARAM_NETDEV_NAME: |
3919 | return iscsi_switch_str_param(&ihost->netdev, buf); |
3920 | case ISCSI_HOST_PARAM_HWADDRESS: |
3921 | return iscsi_switch_str_param(&ihost->hwaddress, buf); |
3922 | case ISCSI_HOST_PARAM_INITIATOR_NAME: |
3923 | return iscsi_switch_str_param(&ihost->initiatorname, buf); |
3924 | default: |
3925 | return -ENOSYS; |
3926 | } |
3927 | |
3928 | return 0; |
3929 | } |
3930 | EXPORT_SYMBOL_GPL(iscsi_host_set_param); |
3931 | |
3932 | MODULE_AUTHOR("Mike Christie" ); |
3933 | MODULE_DESCRIPTION("iSCSI library functions" ); |
3934 | MODULE_LICENSE("GPL" ); |
3935 | |