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7996a778 MC |
1 | /* |
2 | * iSCSI lib functions | |
3 | * | |
4 | * Copyright (C) 2006 Red Hat, Inc. All rights reserved. | |
5 | * Copyright (C) 2004 - 2006 Mike Christie | |
6 | * Copyright (C) 2004 - 2005 Dmitry Yusupov | |
7 | * Copyright (C) 2004 - 2005 Alex Aizman | |
8 | * maintained by open-iscsi@googlegroups.com | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
23 | */ | |
24 | #include <linux/types.h> | |
25 | #include <linux/mutex.h> | |
26 | #include <linux/kfifo.h> | |
27 | #include <linux/delay.h> | |
28 | #include <net/tcp.h> | |
29 | #include <scsi/scsi_cmnd.h> | |
30 | #include <scsi/scsi_device.h> | |
31 | #include <scsi/scsi_eh.h> | |
32 | #include <scsi/scsi_tcq.h> | |
33 | #include <scsi/scsi_host.h> | |
34 | #include <scsi/scsi.h> | |
35 | #include <scsi/iscsi_proto.h> | |
36 | #include <scsi/scsi_transport.h> | |
37 | #include <scsi/scsi_transport_iscsi.h> | |
38 | #include <scsi/libiscsi.h> | |
39 | ||
40 | struct iscsi_session * | |
41 | class_to_transport_session(struct iscsi_cls_session *cls_session) | |
42 | { | |
43 | struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); | |
44 | return iscsi_hostdata(shost->hostdata); | |
45 | } | |
46 | EXPORT_SYMBOL_GPL(class_to_transport_session); | |
47 | ||
48 | #define INVALID_SN_DELTA 0xffff | |
49 | ||
50 | int | |
51 | iscsi_check_assign_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr) | |
52 | { | |
53 | uint32_t max_cmdsn = be32_to_cpu(hdr->max_cmdsn); | |
54 | uint32_t exp_cmdsn = be32_to_cpu(hdr->exp_cmdsn); | |
55 | ||
56 | if (max_cmdsn < exp_cmdsn -1 && | |
57 | max_cmdsn > exp_cmdsn - INVALID_SN_DELTA) | |
58 | return ISCSI_ERR_MAX_CMDSN; | |
59 | if (max_cmdsn > session->max_cmdsn || | |
60 | max_cmdsn < session->max_cmdsn - INVALID_SN_DELTA) | |
61 | session->max_cmdsn = max_cmdsn; | |
62 | if (exp_cmdsn > session->exp_cmdsn || | |
63 | exp_cmdsn < session->exp_cmdsn - INVALID_SN_DELTA) | |
64 | session->exp_cmdsn = exp_cmdsn; | |
65 | ||
66 | return 0; | |
67 | } | |
68 | EXPORT_SYMBOL_GPL(iscsi_check_assign_cmdsn); | |
69 | ||
70 | void iscsi_prep_unsolicit_data_pdu(struct iscsi_cmd_task *ctask, | |
71 | struct iscsi_data *hdr, | |
72 | int transport_data_cnt) | |
73 | { | |
74 | struct iscsi_conn *conn = ctask->conn; | |
75 | ||
76 | memset(hdr, 0, sizeof(struct iscsi_data)); | |
77 | hdr->ttt = cpu_to_be32(ISCSI_RESERVED_TAG); | |
78 | hdr->datasn = cpu_to_be32(ctask->unsol_datasn); | |
79 | ctask->unsol_datasn++; | |
80 | hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; | |
81 | memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); | |
82 | ||
83 | hdr->itt = ctask->hdr->itt; | |
84 | hdr->exp_statsn = cpu_to_be32(conn->exp_statsn); | |
85 | ||
86 | hdr->offset = cpu_to_be32(ctask->total_length - | |
87 | transport_data_cnt - | |
88 | ctask->unsol_count); | |
89 | ||
90 | if (ctask->unsol_count > conn->max_xmit_dlength) { | |
91 | hton24(hdr->dlength, conn->max_xmit_dlength); | |
92 | ctask->data_count = conn->max_xmit_dlength; | |
93 | hdr->flags = 0; | |
94 | } else { | |
95 | hton24(hdr->dlength, ctask->unsol_count); | |
96 | ctask->data_count = ctask->unsol_count; | |
97 | hdr->flags = ISCSI_FLAG_CMD_FINAL; | |
98 | } | |
99 | } | |
100 | EXPORT_SYMBOL_GPL(iscsi_prep_unsolicit_data_pdu); | |
101 | ||
102 | /** | |
103 | * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu | |
104 | * @ctask: iscsi cmd task | |
105 | * | |
106 | * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set | |
107 | * fields like dlength or final based on how much data it sends | |
108 | */ | |
109 | static void iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask) | |
110 | { | |
111 | struct iscsi_conn *conn = ctask->conn; | |
112 | struct iscsi_session *session = conn->session; | |
113 | struct iscsi_cmd *hdr = ctask->hdr; | |
114 | struct scsi_cmnd *sc = ctask->sc; | |
115 | ||
116 | hdr->opcode = ISCSI_OP_SCSI_CMD; | |
117 | hdr->flags = ISCSI_ATTR_SIMPLE; | |
118 | int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun); | |
119 | hdr->itt = ctask->itt | (conn->id << ISCSI_CID_SHIFT) | | |
120 | (session->age << ISCSI_AGE_SHIFT); | |
121 | hdr->data_length = cpu_to_be32(sc->request_bufflen); | |
122 | hdr->cmdsn = cpu_to_be32(session->cmdsn); | |
123 | session->cmdsn++; | |
124 | hdr->exp_statsn = cpu_to_be32(conn->exp_statsn); | |
125 | memcpy(hdr->cdb, sc->cmnd, sc->cmd_len); | |
126 | memset(&hdr->cdb[sc->cmd_len], 0, MAX_COMMAND_SIZE - sc->cmd_len); | |
127 | ||
128 | if (sc->sc_data_direction == DMA_TO_DEVICE) { | |
129 | hdr->flags |= ISCSI_FLAG_CMD_WRITE; | |
130 | /* | |
131 | * Write counters: | |
132 | * | |
133 | * imm_count bytes to be sent right after | |
134 | * SCSI PDU Header | |
135 | * | |
136 | * unsol_count bytes(as Data-Out) to be sent | |
137 | * without R2T ack right after | |
138 | * immediate data | |
139 | * | |
140 | * r2t_data_count bytes to be sent via R2T ack's | |
141 | * | |
142 | * pad_count bytes to be sent as zero-padding | |
143 | */ | |
144 | ctask->imm_count = 0; | |
145 | ctask->unsol_count = 0; | |
146 | ctask->unsol_datasn = 0; | |
147 | ||
148 | if (session->imm_data_en) { | |
149 | if (ctask->total_length >= session->first_burst) | |
150 | ctask->imm_count = min(session->first_burst, | |
151 | conn->max_xmit_dlength); | |
152 | else | |
153 | ctask->imm_count = min(ctask->total_length, | |
154 | conn->max_xmit_dlength); | |
155 | hton24(ctask->hdr->dlength, ctask->imm_count); | |
156 | } else | |
157 | zero_data(ctask->hdr->dlength); | |
158 | ||
159 | if (!session->initial_r2t_en) | |
160 | ctask->unsol_count = min(session->first_burst, | |
161 | ctask->total_length) - ctask->imm_count; | |
162 | if (!ctask->unsol_count) | |
163 | /* No unsolicit Data-Out's */ | |
164 | ctask->hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
165 | } else { | |
166 | ctask->datasn = 0; | |
167 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
168 | zero_data(hdr->dlength); | |
169 | ||
170 | if (sc->sc_data_direction == DMA_FROM_DEVICE) | |
171 | hdr->flags |= ISCSI_FLAG_CMD_READ; | |
172 | } | |
173 | ||
174 | conn->scsicmd_pdus_cnt++; | |
175 | } | |
176 | EXPORT_SYMBOL_GPL(iscsi_prep_scsi_cmd_pdu); | |
177 | ||
178 | /** | |
179 | * iscsi_complete_command - return command back to scsi-ml | |
180 | * @session: iscsi session | |
181 | * @ctask: iscsi cmd task | |
182 | * | |
183 | * Must be called with session lock. | |
184 | * This function returns the scsi command to scsi-ml and returns | |
185 | * the cmd task to the pool of available cmd tasks. | |
186 | */ | |
187 | static void iscsi_complete_command(struct iscsi_session *session, | |
188 | struct iscsi_cmd_task *ctask) | |
189 | { | |
190 | struct scsi_cmnd *sc = ctask->sc; | |
191 | ||
192 | ctask->sc = NULL; | |
193 | list_del_init(&ctask->running); | |
194 | __kfifo_put(session->cmdpool.queue, (void*)&ctask, sizeof(void*)); | |
195 | sc->scsi_done(sc); | |
196 | } | |
197 | ||
198 | /** | |
199 | * iscsi_cmd_rsp - SCSI Command Response processing | |
200 | * @conn: iscsi connection | |
201 | * @hdr: iscsi header | |
202 | * @ctask: scsi command task | |
203 | * @data: cmd data buffer | |
204 | * @datalen: len of buffer | |
205 | * | |
206 | * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and | |
207 | * then completes the command and task. | |
208 | **/ | |
209 | static int iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
210 | struct iscsi_cmd_task *ctask, char *data, | |
211 | int datalen) | |
212 | { | |
213 | int rc; | |
214 | struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)hdr; | |
215 | struct iscsi_session *session = conn->session; | |
216 | struct scsi_cmnd *sc = ctask->sc; | |
217 | ||
218 | rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr); | |
219 | if (rc) { | |
220 | sc->result = DID_ERROR << 16; | |
221 | goto out; | |
222 | } | |
223 | ||
224 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; | |
225 | ||
226 | sc->result = (DID_OK << 16) | rhdr->cmd_status; | |
227 | ||
228 | if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) { | |
229 | sc->result = DID_ERROR << 16; | |
230 | goto out; | |
231 | } | |
232 | ||
233 | if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) { | |
234 | int senselen; | |
235 | ||
236 | if (datalen < 2) { | |
237 | invalid_datalen: | |
238 | printk(KERN_ERR "Got CHECK_CONDITION but invalid " | |
239 | "data buffer size of %d\n", datalen); | |
240 | sc->result = DID_BAD_TARGET << 16; | |
241 | goto out; | |
242 | } | |
243 | ||
244 | senselen = (data[0] << 8) | data[1]; | |
245 | if (datalen < senselen) | |
246 | goto invalid_datalen; | |
247 | ||
248 | memcpy(sc->sense_buffer, data + 2, | |
249 | min(senselen, SCSI_SENSE_BUFFERSIZE)); | |
250 | debug_scsi("copied %d bytes of sense\n", | |
251 | min(senselen, SCSI_SENSE_BUFFERSIZE)); | |
252 | } | |
253 | ||
254 | if (sc->sc_data_direction == DMA_TO_DEVICE) | |
255 | goto out; | |
256 | ||
257 | if (rhdr->flags & ISCSI_FLAG_CMD_UNDERFLOW) { | |
258 | int res_count = be32_to_cpu(rhdr->residual_count); | |
259 | ||
260 | if (res_count > 0 && res_count <= sc->request_bufflen) | |
261 | sc->resid = res_count; | |
262 | else | |
263 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
264 | } else if (rhdr->flags & ISCSI_FLAG_CMD_BIDI_UNDERFLOW) | |
265 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
266 | else if (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW) | |
267 | sc->resid = be32_to_cpu(rhdr->residual_count); | |
268 | ||
269 | out: | |
270 | debug_scsi("done [sc %lx res %d itt 0x%x]\n", | |
271 | (long)sc, sc->result, ctask->itt); | |
272 | conn->scsirsp_pdus_cnt++; | |
273 | ||
274 | iscsi_complete_command(conn->session, ctask); | |
275 | return rc; | |
276 | } | |
277 | ||
278 | /** | |
279 | * __iscsi_complete_pdu - complete pdu | |
280 | * @conn: iscsi conn | |
281 | * @hdr: iscsi header | |
282 | * @data: data buffer | |
283 | * @datalen: len of data buffer | |
284 | * | |
285 | * Completes pdu processing by freeing any resources allocated at | |
286 | * queuecommand or send generic. session lock must be held and verify | |
287 | * itt must have been called. | |
288 | */ | |
289 | int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
290 | char *data, int datalen) | |
291 | { | |
292 | struct iscsi_session *session = conn->session; | |
293 | int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0; | |
294 | struct iscsi_cmd_task *ctask; | |
295 | struct iscsi_mgmt_task *mtask; | |
296 | uint32_t itt; | |
297 | ||
298 | if (hdr->itt != cpu_to_be32(ISCSI_RESERVED_TAG)) | |
299 | itt = hdr->itt & ISCSI_ITT_MASK; | |
300 | else | |
301 | itt = hdr->itt; | |
302 | ||
303 | if (itt < session->cmds_max) { | |
304 | ctask = session->cmds[itt]; | |
305 | ||
306 | debug_scsi("cmdrsp [op 0x%x cid %d itt 0x%x len %d]\n", | |
307 | opcode, conn->id, ctask->itt, datalen); | |
308 | ||
309 | switch(opcode) { | |
310 | case ISCSI_OP_SCSI_CMD_RSP: | |
311 | BUG_ON((void*)ctask != ctask->sc->SCp.ptr); | |
312 | rc = iscsi_scsi_cmd_rsp(conn, hdr, ctask, data, | |
313 | datalen); | |
314 | break; | |
315 | case ISCSI_OP_SCSI_DATA_IN: | |
316 | BUG_ON((void*)ctask != ctask->sc->SCp.ptr); | |
317 | if (hdr->flags & ISCSI_FLAG_DATA_STATUS) { | |
318 | conn->scsirsp_pdus_cnt++; | |
319 | iscsi_complete_command(session, ctask); | |
320 | } | |
321 | break; | |
322 | case ISCSI_OP_R2T: | |
323 | /* LLD handles this for now */ | |
324 | break; | |
325 | default: | |
326 | rc = ISCSI_ERR_BAD_OPCODE; | |
327 | break; | |
328 | } | |
329 | } else if (itt >= ISCSI_MGMT_ITT_OFFSET && | |
330 | itt < ISCSI_MGMT_ITT_OFFSET + session->mgmtpool_max) { | |
331 | mtask = session->mgmt_cmds[itt - ISCSI_MGMT_ITT_OFFSET]; | |
332 | ||
333 | debug_scsi("immrsp [op 0x%x cid %d itt 0x%x len %d]\n", | |
334 | opcode, conn->id, mtask->itt, datalen); | |
335 | ||
336 | switch(opcode) { | |
337 | case ISCSI_OP_LOGIN_RSP: | |
338 | case ISCSI_OP_TEXT_RSP: | |
339 | case ISCSI_OP_LOGOUT_RSP: | |
340 | rc = iscsi_check_assign_cmdsn(session, | |
341 | (struct iscsi_nopin*)hdr); | |
342 | if (rc) | |
343 | break; | |
344 | ||
345 | rc = iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen); | |
346 | list_del(&mtask->running); | |
347 | if (conn->login_mtask != mtask) | |
348 | __kfifo_put(session->mgmtpool.queue, | |
349 | (void*)&mtask, sizeof(void*)); | |
350 | break; | |
351 | case ISCSI_OP_SCSI_TMFUNC_RSP: | |
352 | rc = iscsi_check_assign_cmdsn(session, | |
353 | (struct iscsi_nopin*)hdr); | |
354 | if (rc) | |
355 | break; | |
356 | ||
357 | if (datalen) { | |
358 | rc = ISCSI_ERR_PROTO; | |
359 | break; | |
360 | } | |
361 | conn->tmfrsp_pdus_cnt++; | |
362 | if (conn->tmabort_state == TMABORT_INITIAL) { | |
363 | conn->tmabort_state = | |
364 | ((struct iscsi_tm_rsp *)hdr)-> | |
365 | response == ISCSI_TMF_RSP_COMPLETE ? | |
366 | TMABORT_SUCCESS:TMABORT_FAILED; | |
367 | /* unblock eh_abort() */ | |
368 | wake_up(&conn->ehwait); | |
369 | } | |
370 | break; | |
371 | case ISCSI_OP_NOOP_IN: | |
372 | if (hdr->ttt != ISCSI_RESERVED_TAG) { | |
373 | rc = ISCSI_ERR_PROTO; | |
374 | break; | |
375 | } | |
376 | rc = iscsi_check_assign_cmdsn(session, | |
377 | (struct iscsi_nopin*)hdr); | |
378 | if (rc) | |
379 | break; | |
380 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
381 | ||
382 | rc = iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen); | |
383 | list_del(&mtask->running); | |
384 | if (conn->login_mtask != mtask) | |
385 | __kfifo_put(session->mgmtpool.queue, | |
386 | (void*)&mtask, sizeof(void*)); | |
387 | break; | |
388 | default: | |
389 | rc = ISCSI_ERR_BAD_OPCODE; | |
390 | break; | |
391 | } | |
392 | } else if (itt == ISCSI_RESERVED_TAG) { | |
393 | switch(opcode) { | |
394 | case ISCSI_OP_NOOP_IN: | |
395 | if (!datalen) { | |
396 | rc = iscsi_check_assign_cmdsn(session, | |
397 | (struct iscsi_nopin*)hdr); | |
398 | if (!rc && hdr->ttt != ISCSI_RESERVED_TAG) | |
399 | rc = iscsi_recv_pdu(conn->cls_conn, | |
400 | hdr, NULL, 0); | |
401 | } else | |
402 | rc = ISCSI_ERR_PROTO; | |
403 | break; | |
404 | case ISCSI_OP_REJECT: | |
405 | /* we need sth like iscsi_reject_rsp()*/ | |
406 | case ISCSI_OP_ASYNC_EVENT: | |
407 | /* we need sth like iscsi_async_event_rsp() */ | |
408 | rc = ISCSI_ERR_BAD_OPCODE; | |
409 | break; | |
410 | default: | |
411 | rc = ISCSI_ERR_BAD_OPCODE; | |
412 | break; | |
413 | } | |
414 | } else | |
415 | rc = ISCSI_ERR_BAD_ITT; | |
416 | ||
417 | return rc; | |
418 | } | |
419 | EXPORT_SYMBOL_GPL(__iscsi_complete_pdu); | |
420 | ||
421 | int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
422 | char *data, int datalen) | |
423 | { | |
424 | int rc; | |
425 | ||
426 | spin_lock(&conn->session->lock); | |
427 | rc = __iscsi_complete_pdu(conn, hdr, data, datalen); | |
428 | spin_unlock(&conn->session->lock); | |
429 | return rc; | |
430 | } | |
431 | EXPORT_SYMBOL_GPL(iscsi_complete_pdu); | |
432 | ||
433 | /* verify itt (itt encoding: age+cid+itt) */ | |
434 | int iscsi_verify_itt(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
435 | uint32_t *ret_itt) | |
436 | { | |
437 | struct iscsi_session *session = conn->session; | |
438 | struct iscsi_cmd_task *ctask; | |
439 | uint32_t itt; | |
440 | ||
441 | if (hdr->itt != cpu_to_be32(ISCSI_RESERVED_TAG)) { | |
442 | if ((hdr->itt & ISCSI_AGE_MASK) != | |
443 | (session->age << ISCSI_AGE_SHIFT)) { | |
444 | printk(KERN_ERR "iscsi_tcp: received itt %x expected " | |
445 | "session age (%x)\n", hdr->itt, | |
446 | session->age & ISCSI_AGE_MASK); | |
447 | return ISCSI_ERR_BAD_ITT; | |
448 | } | |
449 | ||
450 | if ((hdr->itt & ISCSI_CID_MASK) != | |
451 | (conn->id << ISCSI_CID_SHIFT)) { | |
452 | printk(KERN_ERR "iscsi_tcp: received itt %x, expected " | |
453 | "CID (%x)\n", hdr->itt, conn->id); | |
454 | return ISCSI_ERR_BAD_ITT; | |
455 | } | |
456 | itt = hdr->itt & ISCSI_ITT_MASK; | |
457 | } else | |
458 | itt = hdr->itt; | |
459 | ||
460 | if (itt < session->cmds_max) { | |
461 | ctask = session->cmds[itt]; | |
462 | ||
463 | if (!ctask->sc) { | |
464 | printk(KERN_INFO "iscsi_tcp: dropping ctask with " | |
465 | "itt 0x%x\n", ctask->itt); | |
466 | /* force drop */ | |
467 | return ISCSI_ERR_NO_SCSI_CMD; | |
468 | } | |
469 | ||
470 | if (ctask->sc->SCp.phase != session->age) { | |
471 | printk(KERN_ERR "iscsi_tcp: ctask's session age %d, " | |
472 | "expected %d\n", ctask->sc->SCp.phase, | |
473 | session->age); | |
474 | return ISCSI_ERR_SESSION_FAILED; | |
475 | } | |
476 | } | |
477 | ||
478 | *ret_itt = itt; | |
479 | return 0; | |
480 | } | |
481 | EXPORT_SYMBOL_GPL(iscsi_verify_itt); | |
482 | ||
483 | void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err) | |
484 | { | |
485 | struct iscsi_session *session = conn->session; | |
486 | unsigned long flags; | |
487 | ||
488 | spin_lock_irqsave(&session->lock, flags); | |
489 | if (session->conn_cnt == 1 || session->leadconn == conn) | |
490 | session->state = ISCSI_STATE_FAILED; | |
491 | spin_unlock_irqrestore(&session->lock, flags); | |
492 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
493 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
494 | iscsi_conn_error(conn->cls_conn, err); | |
495 | } | |
496 | EXPORT_SYMBOL_GPL(iscsi_conn_failure); | |
497 | ||
498 | /** | |
499 | * iscsi_data_xmit - xmit any command into the scheduled connection | |
500 | * @conn: iscsi connection | |
501 | * | |
502 | * Notes: | |
503 | * The function can return -EAGAIN in which case the caller must | |
504 | * re-schedule it again later or recover. '0' return code means | |
505 | * successful xmit. | |
506 | **/ | |
507 | static int iscsi_data_xmit(struct iscsi_conn *conn) | |
508 | { | |
509 | struct iscsi_transport *tt; | |
510 | ||
511 | if (unlikely(conn->suspend_tx)) { | |
512 | debug_scsi("conn %d Tx suspended!\n", conn->id); | |
513 | return 0; | |
514 | } | |
515 | tt = conn->session->tt; | |
516 | ||
517 | /* | |
518 | * Transmit in the following order: | |
519 | * | |
520 | * 1) un-finished xmit (ctask or mtask) | |
521 | * 2) immediate control PDUs | |
522 | * 3) write data | |
523 | * 4) SCSI commands | |
524 | * 5) non-immediate control PDUs | |
525 | * | |
526 | * No need to lock around __kfifo_get as long as | |
527 | * there's one producer and one consumer. | |
528 | */ | |
529 | ||
530 | BUG_ON(conn->ctask && conn->mtask); | |
531 | ||
532 | if (conn->ctask) { | |
533 | if (tt->xmit_cmd_task(conn, conn->ctask)) | |
534 | goto again; | |
535 | /* done with this in-progress ctask */ | |
536 | conn->ctask = NULL; | |
537 | } | |
538 | if (conn->mtask) { | |
539 | if (tt->xmit_mgmt_task(conn, conn->mtask)) | |
540 | goto again; | |
541 | /* done with this in-progress mtask */ | |
542 | conn->mtask = NULL; | |
543 | } | |
544 | ||
545 | /* process immediate first */ | |
546 | if (unlikely(__kfifo_len(conn->immqueue))) { | |
547 | while (__kfifo_get(conn->immqueue, (void*)&conn->mtask, | |
548 | sizeof(void*))) { | |
549 | list_add_tail(&conn->mtask->running, | |
550 | &conn->mgmt_run_list); | |
551 | if (tt->xmit_mgmt_task(conn, conn->mtask)) | |
552 | goto again; | |
553 | } | |
554 | /* done with this mtask */ | |
555 | conn->mtask = NULL; | |
556 | } | |
557 | ||
558 | /* process command queue */ | |
559 | while (__kfifo_get(conn->xmitqueue, (void*)&conn->ctask, | |
560 | sizeof(void*))) { | |
561 | /* | |
562 | * iscsi tcp may readd the task to the xmitqueue to send | |
563 | * write data | |
564 | */ | |
565 | if (list_empty(&conn->ctask->running)) | |
566 | list_add_tail(&conn->ctask->running, &conn->run_list); | |
567 | if (tt->xmit_cmd_task(conn, conn->ctask)) | |
568 | goto again; | |
569 | } | |
570 | /* done with this ctask */ | |
571 | conn->ctask = NULL; | |
572 | ||
573 | /* process the rest control plane PDUs, if any */ | |
574 | if (unlikely(__kfifo_len(conn->mgmtqueue))) { | |
575 | while (__kfifo_get(conn->mgmtqueue, (void*)&conn->mtask, | |
576 | sizeof(void*))) { | |
577 | list_add_tail(&conn->mtask->running, | |
578 | &conn->mgmt_run_list); | |
579 | if (tt->xmit_mgmt_task(conn, conn->mtask)) | |
580 | goto again; | |
581 | } | |
582 | /* done with this mtask */ | |
583 | conn->mtask = NULL; | |
584 | } | |
585 | ||
586 | return 0; | |
587 | ||
588 | again: | |
589 | if (unlikely(conn->suspend_tx)) | |
590 | return 0; | |
591 | ||
592 | return -EAGAIN; | |
593 | } | |
594 | ||
595 | static void iscsi_xmitworker(void *data) | |
596 | { | |
597 | struct iscsi_conn *conn = data; | |
598 | ||
599 | /* | |
600 | * serialize Xmit worker on a per-connection basis. | |
601 | */ | |
602 | mutex_lock(&conn->xmitmutex); | |
603 | if (iscsi_data_xmit(conn)) | |
604 | scsi_queue_work(conn->session->host, &conn->xmitwork); | |
605 | mutex_unlock(&conn->xmitmutex); | |
606 | } | |
607 | ||
608 | enum { | |
609 | FAILURE_BAD_HOST = 1, | |
610 | FAILURE_SESSION_FAILED, | |
611 | FAILURE_SESSION_FREED, | |
612 | FAILURE_WINDOW_CLOSED, | |
613 | FAILURE_SESSION_TERMINATE, | |
614 | FAILURE_SESSION_RECOVERY_TIMEOUT, | |
615 | }; | |
616 | ||
617 | int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *)) | |
618 | { | |
619 | struct Scsi_Host *host; | |
620 | int reason = 0; | |
621 | struct iscsi_session *session; | |
622 | struct iscsi_conn *conn; | |
623 | struct iscsi_cmd_task *ctask = NULL; | |
624 | ||
625 | sc->scsi_done = done; | |
626 | sc->result = 0; | |
627 | ||
628 | host = sc->device->host; | |
629 | session = iscsi_hostdata(host->hostdata); | |
630 | ||
631 | spin_lock(&session->lock); | |
632 | ||
633 | if (session->state != ISCSI_STATE_LOGGED_IN) { | |
634 | if (session->recovery_failed) { | |
635 | reason = FAILURE_SESSION_RECOVERY_TIMEOUT; | |
636 | goto fault; | |
637 | } else if (session->state == ISCSI_STATE_FAILED) { | |
638 | reason = FAILURE_SESSION_FAILED; | |
639 | goto reject; | |
640 | } else if (session->state == ISCSI_STATE_TERMINATE) { | |
641 | reason = FAILURE_SESSION_TERMINATE; | |
642 | goto fault; | |
643 | } | |
644 | reason = FAILURE_SESSION_FREED; | |
645 | goto fault; | |
646 | } | |
647 | ||
648 | /* | |
649 | * Check for iSCSI window and take care of CmdSN wrap-around | |
650 | */ | |
651 | if ((int)(session->max_cmdsn - session->cmdsn) < 0) { | |
652 | reason = FAILURE_WINDOW_CLOSED; | |
653 | goto reject; | |
654 | } | |
655 | ||
656 | conn = session->leadconn; | |
657 | ||
658 | __kfifo_get(session->cmdpool.queue, (void*)&ctask, sizeof(void*)); | |
659 | sc->SCp.phase = session->age; | |
660 | sc->SCp.ptr = (char *)ctask; | |
661 | ||
662 | ctask->mtask = NULL; | |
663 | ctask->conn = conn; | |
664 | ctask->sc = sc; | |
665 | INIT_LIST_HEAD(&ctask->running); | |
666 | ctask->total_length = sc->request_bufflen; | |
667 | iscsi_prep_scsi_cmd_pdu(ctask); | |
668 | ||
669 | session->tt->init_cmd_task(ctask); | |
670 | ||
671 | __kfifo_put(conn->xmitqueue, (void*)&ctask, sizeof(void*)); | |
672 | debug_scsi( | |
673 | "ctask enq [%s cid %d sc %lx itt 0x%x len %d cmdsn %d win %d]\n", | |
674 | sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read", | |
675 | conn->id, (long)sc, ctask->itt, sc->request_bufflen, | |
676 | session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1); | |
677 | spin_unlock(&session->lock); | |
678 | ||
679 | scsi_queue_work(host, &conn->xmitwork); | |
680 | return 0; | |
681 | ||
682 | reject: | |
683 | spin_unlock(&session->lock); | |
684 | debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason); | |
685 | return SCSI_MLQUEUE_HOST_BUSY; | |
686 | ||
687 | fault: | |
688 | spin_unlock(&session->lock); | |
689 | printk(KERN_ERR "iscsi_tcp: cmd 0x%x is not queued (%d)\n", | |
690 | sc->cmnd[0], reason); | |
691 | sc->result = (DID_NO_CONNECT << 16); | |
692 | sc->resid = sc->request_bufflen; | |
693 | sc->scsi_done(sc); | |
694 | return 0; | |
695 | } | |
696 | EXPORT_SYMBOL_GPL(iscsi_queuecommand); | |
697 | ||
698 | int iscsi_change_queue_depth(struct scsi_device *sdev, int depth) | |
699 | { | |
700 | if (depth > ISCSI_MAX_CMD_PER_LUN) | |
701 | depth = ISCSI_MAX_CMD_PER_LUN; | |
702 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); | |
703 | return sdev->queue_depth; | |
704 | } | |
705 | EXPORT_SYMBOL_GPL(iscsi_change_queue_depth); | |
706 | ||
707 | static int | |
708 | iscsi_conn_send_generic(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
709 | char *data, uint32_t data_size) | |
710 | { | |
711 | struct iscsi_session *session = conn->session; | |
712 | struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr; | |
713 | struct iscsi_mgmt_task *mtask; | |
714 | ||
715 | spin_lock_bh(&session->lock); | |
716 | if (session->state == ISCSI_STATE_TERMINATE) { | |
717 | spin_unlock_bh(&session->lock); | |
718 | return -EPERM; | |
719 | } | |
720 | if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) || | |
721 | hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE)) | |
722 | /* | |
723 | * Login and Text are sent serially, in | |
724 | * request-followed-by-response sequence. | |
725 | * Same mtask can be used. Same ITT must be used. | |
726 | * Note that login_mtask is preallocated at conn_create(). | |
727 | */ | |
728 | mtask = conn->login_mtask; | |
729 | else { | |
730 | BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE); | |
731 | BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED); | |
732 | ||
733 | if (!__kfifo_get(session->mgmtpool.queue, | |
734 | (void*)&mtask, sizeof(void*))) { | |
735 | spin_unlock_bh(&session->lock); | |
736 | return -ENOSPC; | |
737 | } | |
738 | } | |
739 | ||
740 | /* | |
741 | * pre-format CmdSN and ExpStatSN for outgoing PDU. | |
742 | */ | |
743 | if (hdr->itt != cpu_to_be32(ISCSI_RESERVED_TAG)) { | |
744 | hdr->itt = mtask->itt | (conn->id << ISCSI_CID_SHIFT) | | |
745 | (session->age << ISCSI_AGE_SHIFT); | |
746 | nop->cmdsn = cpu_to_be32(session->cmdsn); | |
747 | if (conn->c_stage == ISCSI_CONN_STARTED && | |
748 | !(hdr->opcode & ISCSI_OP_IMMEDIATE)) | |
749 | session->cmdsn++; | |
750 | } else | |
751 | /* do not advance CmdSN */ | |
752 | nop->cmdsn = cpu_to_be32(session->cmdsn); | |
753 | ||
754 | nop->exp_statsn = cpu_to_be32(conn->exp_statsn); | |
755 | ||
756 | if (data_size) { | |
757 | memcpy(mtask->data, data, data_size); | |
758 | mtask->data_count = data_size; | |
759 | } else | |
760 | mtask->data_count = 0; | |
761 | ||
762 | INIT_LIST_HEAD(&mtask->running); | |
763 | memcpy(mtask->hdr, hdr, sizeof(struct iscsi_hdr)); | |
764 | if (session->tt->init_mgmt_task) | |
765 | session->tt->init_mgmt_task(conn, mtask, data, data_size); | |
766 | spin_unlock_bh(&session->lock); | |
767 | ||
768 | debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n", | |
769 | hdr->opcode, hdr->itt, data_size); | |
770 | ||
771 | /* | |
772 | * since send_pdu() could be called at least from two contexts, | |
773 | * we need to serialize __kfifo_put, so we don't have to take | |
774 | * additional lock on fast data-path | |
775 | */ | |
776 | if (hdr->opcode & ISCSI_OP_IMMEDIATE) | |
777 | __kfifo_put(conn->immqueue, (void*)&mtask, sizeof(void*)); | |
778 | else | |
779 | __kfifo_put(conn->mgmtqueue, (void*)&mtask, sizeof(void*)); | |
780 | ||
781 | scsi_queue_work(session->host, &conn->xmitwork); | |
782 | return 0; | |
783 | } | |
784 | ||
785 | int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr, | |
786 | char *data, uint32_t data_size) | |
787 | { | |
788 | struct iscsi_conn *conn = cls_conn->dd_data; | |
789 | int rc; | |
790 | ||
791 | mutex_lock(&conn->xmitmutex); | |
792 | rc = iscsi_conn_send_generic(conn, hdr, data, data_size); | |
793 | mutex_unlock(&conn->xmitmutex); | |
794 | ||
795 | return rc; | |
796 | } | |
797 | EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu); | |
798 | ||
799 | void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session) | |
800 | { | |
801 | struct iscsi_session *session = class_to_transport_session(cls_session); | |
802 | struct iscsi_conn *conn = session->leadconn; | |
803 | ||
804 | spin_lock_bh(&session->lock); | |
805 | if (session->state != ISCSI_STATE_LOGGED_IN) { | |
806 | session->recovery_failed = 1; | |
807 | if (conn) | |
808 | wake_up(&conn->ehwait); | |
809 | } | |
810 | spin_unlock_bh(&session->lock); | |
811 | } | |
812 | EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout); | |
813 | ||
814 | int iscsi_eh_host_reset(struct scsi_cmnd *sc) | |
815 | { | |
816 | struct Scsi_Host *host = sc->device->host; | |
817 | struct iscsi_session *session = iscsi_hostdata(host->hostdata); | |
818 | struct iscsi_conn *conn = session->leadconn; | |
819 | int fail_session = 0; | |
820 | ||
821 | spin_lock_bh(&session->lock); | |
822 | if (session->state == ISCSI_STATE_TERMINATE) { | |
823 | failed: | |
824 | debug_scsi("failing host reset: session terminated " | |
825 | "[CID %d age %d]", conn->id, session->age); | |
826 | spin_unlock_bh(&session->lock); | |
827 | return FAILED; | |
828 | } | |
829 | ||
830 | if (sc->SCp.phase == session->age) { | |
831 | debug_scsi("failing connection CID %d due to SCSI host reset", | |
832 | conn->id); | |
833 | fail_session = 1; | |
834 | } | |
835 | spin_unlock_bh(&session->lock); | |
836 | ||
837 | /* | |
838 | * we drop the lock here but the leadconn cannot be destoyed while | |
839 | * we are in the scsi eh | |
840 | */ | |
841 | if (fail_session) { | |
842 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
843 | /* | |
844 | * if userspace cannot respond then we must kick this off | |
845 | * here for it | |
846 | */ | |
847 | iscsi_start_session_recovery(session, conn, STOP_CONN_RECOVER); | |
848 | } | |
849 | ||
850 | debug_scsi("iscsi_eh_host_reset wait for relogin\n"); | |
851 | wait_event_interruptible(conn->ehwait, | |
852 | session->state == ISCSI_STATE_TERMINATE || | |
853 | session->state == ISCSI_STATE_LOGGED_IN || | |
854 | session->recovery_failed); | |
855 | if (signal_pending(current)) | |
856 | flush_signals(current); | |
857 | ||
858 | spin_lock_bh(&session->lock); | |
859 | if (session->state == ISCSI_STATE_LOGGED_IN) | |
860 | printk(KERN_INFO "host reset succeeded\n"); | |
861 | else | |
862 | goto failed; | |
863 | spin_unlock_bh(&session->lock); | |
864 | ||
865 | return SUCCESS; | |
866 | } | |
867 | EXPORT_SYMBOL_GPL(iscsi_eh_host_reset); | |
868 | ||
869 | static void iscsi_tmabort_timedout(unsigned long data) | |
870 | { | |
871 | struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)data; | |
872 | struct iscsi_conn *conn = ctask->conn; | |
873 | struct iscsi_session *session = conn->session; | |
874 | ||
875 | spin_lock(&session->lock); | |
876 | if (conn->tmabort_state == TMABORT_INITIAL) { | |
877 | conn->tmabort_state = TMABORT_TIMEDOUT; | |
878 | debug_scsi("tmabort timedout [sc %p itt 0x%x]\n", | |
879 | ctask->sc, ctask->itt); | |
880 | /* unblock eh_abort() */ | |
881 | wake_up(&conn->ehwait); | |
882 | } | |
883 | spin_unlock(&session->lock); | |
884 | } | |
885 | ||
886 | /* must be called with the mutex lock */ | |
887 | static int iscsi_exec_abort_task(struct scsi_cmnd *sc, | |
888 | struct iscsi_cmd_task *ctask) | |
889 | { | |
890 | struct iscsi_conn *conn = ctask->conn; | |
891 | struct iscsi_session *session = conn->session; | |
892 | struct iscsi_tm *hdr = &conn->tmhdr; | |
893 | int rc; | |
894 | ||
895 | /* | |
896 | * ctask timed out but session is OK requests must be serialized. | |
897 | */ | |
898 | memset(hdr, 0, sizeof(struct iscsi_tm)); | |
899 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
900 | hdr->flags = ISCSI_TM_FUNC_ABORT_TASK; | |
901 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
902 | memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); | |
903 | hdr->rtt = ctask->hdr->itt; | |
904 | hdr->refcmdsn = ctask->hdr->cmdsn; | |
905 | ||
906 | rc = iscsi_conn_send_generic(conn, (struct iscsi_hdr *)hdr, | |
907 | NULL, 0); | |
908 | if (rc) { | |
909 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
910 | debug_scsi("abort sent failure [itt 0x%x] %d", ctask->itt, rc); | |
911 | return rc; | |
912 | } | |
913 | ||
914 | debug_scsi("abort sent [itt 0x%x]\n", ctask->itt); | |
915 | ||
916 | spin_lock_bh(&session->lock); | |
917 | ctask->mtask = (struct iscsi_mgmt_task *) | |
918 | session->mgmt_cmds[(hdr->itt & ISCSI_ITT_MASK) - | |
919 | ISCSI_MGMT_ITT_OFFSET]; | |
920 | ||
921 | if (conn->tmabort_state == TMABORT_INITIAL) { | |
922 | conn->tmfcmd_pdus_cnt++; | |
923 | conn->tmabort_timer.expires = 10*HZ + jiffies; | |
924 | conn->tmabort_timer.function = iscsi_tmabort_timedout; | |
925 | conn->tmabort_timer.data = (unsigned long)ctask; | |
926 | add_timer(&conn->tmabort_timer); | |
927 | debug_scsi("abort set timeout [itt 0x%x]", ctask->itt); | |
928 | } | |
929 | spin_unlock_bh(&session->lock); | |
930 | mutex_unlock(&conn->xmitmutex); | |
931 | ||
932 | /* | |
933 | * block eh thread until: | |
934 | * | |
935 | * 1) abort response | |
936 | * 2) abort timeout | |
937 | * 3) session is terminated or restarted or userspace has | |
938 | * given up on recovery | |
939 | */ | |
940 | wait_event_interruptible(conn->ehwait, | |
941 | sc->SCp.phase != session->age || | |
942 | session->state != ISCSI_STATE_LOGGED_IN || | |
943 | conn->tmabort_state != TMABORT_INITIAL || | |
944 | session->recovery_failed); | |
945 | if (signal_pending(current)) | |
946 | flush_signals(current); | |
947 | del_timer_sync(&conn->tmabort_timer); | |
948 | ||
949 | mutex_lock(&conn->xmitmutex); | |
950 | return 0; | |
951 | } | |
952 | ||
953 | /* | |
954 | * xmit mutex and session lock must be held | |
955 | */ | |
956 | #define iscsi_remove_task(tasktype) \ | |
957 | static struct iscsi_##tasktype * \ | |
958 | iscsi_remove_##tasktype(struct kfifo *fifo, uint32_t itt) \ | |
959 | { \ | |
960 | int i, nr_tasks = __kfifo_len(fifo) / sizeof(void*); \ | |
961 | struct iscsi_##tasktype *task; \ | |
962 | \ | |
963 | debug_scsi("searching %d tasks\n", nr_tasks); \ | |
964 | \ | |
965 | for (i = 0; i < nr_tasks; i++) { \ | |
966 | __kfifo_get(fifo, (void*)&task, sizeof(void*)); \ | |
967 | debug_scsi("check task %u\n", task->itt); \ | |
968 | \ | |
969 | if (task->itt == itt) { \ | |
970 | debug_scsi("matched task\n"); \ | |
971 | break; \ | |
972 | } \ | |
973 | \ | |
974 | __kfifo_put(fifo, (void*)&task, sizeof(void*)); \ | |
975 | } \ | |
976 | return NULL; \ | |
977 | } | |
978 | ||
979 | iscsi_remove_task(mgmt_task); | |
980 | iscsi_remove_task(cmd_task); | |
981 | ||
982 | static int iscsi_ctask_mtask_cleanup(struct iscsi_cmd_task *ctask) | |
983 | { | |
984 | struct iscsi_conn *conn = ctask->conn; | |
985 | struct iscsi_session *session = conn->session; | |
986 | ||
987 | if (!ctask->mtask) | |
988 | return -EINVAL; | |
989 | ||
990 | if (!iscsi_remove_mgmt_task(conn->immqueue, ctask->mtask->itt)) | |
991 | list_del(&ctask->mtask->running); | |
992 | __kfifo_put(session->mgmtpool.queue, (void*)&ctask->mtask, | |
993 | sizeof(void*)); | |
994 | ctask->mtask = NULL; | |
995 | return 0; | |
996 | } | |
997 | ||
998 | /* | |
999 | * session lock and xmitmutex must be held | |
1000 | */ | |
1001 | static void fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, | |
1002 | int err) | |
1003 | { | |
1004 | struct scsi_cmnd *sc; | |
1005 | ||
1006 | conn->session->tt->cleanup_cmd_task(conn, ctask); | |
1007 | iscsi_ctask_mtask_cleanup(ctask); | |
1008 | ||
1009 | sc = ctask->sc; | |
1010 | if (!sc) | |
1011 | return; | |
1012 | sc->result = err; | |
1013 | sc->resid = sc->request_bufflen; | |
1014 | iscsi_complete_command(conn->session, ctask); | |
1015 | } | |
1016 | ||
1017 | int iscsi_eh_abort(struct scsi_cmnd *sc) | |
1018 | { | |
1019 | struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)sc->SCp.ptr; | |
1020 | struct iscsi_conn *conn = ctask->conn; | |
1021 | struct iscsi_session *session = conn->session; | |
1022 | struct iscsi_cmd_task *pending_ctask; | |
1023 | int rc; | |
1024 | ||
1025 | conn->eh_abort_cnt++; | |
1026 | debug_scsi("aborting [sc %p itt 0x%x]\n", sc, ctask->itt); | |
1027 | ||
1028 | mutex_lock(&conn->xmitmutex); | |
1029 | spin_lock_bh(&session->lock); | |
1030 | ||
1031 | /* | |
1032 | * If we are not logged in or we have started a new session | |
1033 | * then let the host reset code handle this | |
1034 | */ | |
1035 | if (session->state != ISCSI_STATE_LOGGED_IN || | |
1036 | sc->SCp.phase != session->age) | |
1037 | goto failed; | |
1038 | ||
1039 | /* ctask completed before time out */ | |
1040 | if (!ctask->sc) | |
1041 | goto success; | |
1042 | ||
1043 | /* what should we do here ? */ | |
1044 | if (conn->ctask == ctask) { | |
1045 | printk(KERN_INFO "sc %p itt 0x%x partially sent. Failing " | |
1046 | "abort\n", sc, ctask->itt); | |
1047 | goto failed; | |
1048 | } | |
1049 | ||
1050 | /* check for the easy pending cmd abort */ | |
1051 | pending_ctask = iscsi_remove_cmd_task(conn->xmitqueue, ctask->itt); | |
1052 | if (pending_ctask) { | |
1053 | /* iscsi_tcp queues write transfers on the xmitqueue */ | |
1054 | if (list_empty(&pending_ctask->running)) { | |
1055 | debug_scsi("found pending task\n"); | |
1056 | goto success; | |
1057 | } else | |
1058 | __kfifo_put(conn->xmitqueue, (void*)&pending_ctask, | |
1059 | sizeof(void*)); | |
1060 | } | |
1061 | ||
1062 | conn->tmabort_state = TMABORT_INITIAL; | |
1063 | ||
1064 | spin_unlock_bh(&session->lock); | |
1065 | rc = iscsi_exec_abort_task(sc, ctask); | |
1066 | spin_lock_bh(&session->lock); | |
1067 | ||
1068 | iscsi_ctask_mtask_cleanup(ctask); | |
1069 | if (rc || sc->SCp.phase != session->age || | |
1070 | session->state != ISCSI_STATE_LOGGED_IN) | |
1071 | goto failed; | |
1072 | ||
1073 | /* ctask completed before tmf abort response */ | |
1074 | if (!ctask->sc) { | |
1075 | debug_scsi("sc completed while abort in progress\n"); | |
1076 | goto success; | |
1077 | } | |
1078 | ||
1079 | if (conn->tmabort_state != TMABORT_SUCCESS) { | |
1080 | spin_unlock_bh(&session->lock); | |
1081 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1082 | spin_lock_bh(&session->lock); | |
1083 | goto failed; | |
1084 | } | |
1085 | ||
1086 | success: | |
1087 | debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, ctask->itt); | |
1088 | spin_unlock_bh(&session->lock); | |
1089 | ||
1090 | /* | |
1091 | * clean up task if aborted. we have the xmitmutex so grab | |
1092 | * the recv lock as a writer | |
1093 | */ | |
1094 | write_lock_bh(conn->recv_lock); | |
1095 | spin_lock(&session->lock); | |
1096 | fail_command(conn, ctask, DID_ABORT << 16); | |
1097 | spin_unlock(&session->lock); | |
1098 | write_unlock_bh(conn->recv_lock); | |
1099 | ||
1100 | mutex_unlock(&conn->xmitmutex); | |
1101 | return SUCCESS; | |
1102 | ||
1103 | failed: | |
1104 | spin_unlock_bh(&session->lock); | |
1105 | mutex_unlock(&conn->xmitmutex); | |
1106 | ||
1107 | debug_scsi("abort failed [sc %lx itt 0x%x]\n", (long)sc, ctask->itt); | |
1108 | return FAILED; | |
1109 | } | |
1110 | EXPORT_SYMBOL_GPL(iscsi_eh_abort); | |
1111 | ||
1112 | int | |
1113 | iscsi_pool_init(struct iscsi_queue *q, int max, void ***items, int item_size) | |
1114 | { | |
1115 | int i; | |
1116 | ||
1117 | *items = kmalloc(max * sizeof(void*), GFP_KERNEL); | |
1118 | if (*items == NULL) | |
1119 | return -ENOMEM; | |
1120 | ||
1121 | q->max = max; | |
1122 | q->pool = kmalloc(max * sizeof(void*), GFP_KERNEL); | |
1123 | if (q->pool == NULL) { | |
1124 | kfree(*items); | |
1125 | return -ENOMEM; | |
1126 | } | |
1127 | ||
1128 | q->queue = kfifo_init((void*)q->pool, max * sizeof(void*), | |
1129 | GFP_KERNEL, NULL); | |
1130 | if (q->queue == ERR_PTR(-ENOMEM)) { | |
1131 | kfree(q->pool); | |
1132 | kfree(*items); | |
1133 | return -ENOMEM; | |
1134 | } | |
1135 | ||
1136 | for (i = 0; i < max; i++) { | |
1137 | q->pool[i] = kmalloc(item_size, GFP_KERNEL); | |
1138 | if (q->pool[i] == NULL) { | |
1139 | int j; | |
1140 | ||
1141 | for (j = 0; j < i; j++) | |
1142 | kfree(q->pool[j]); | |
1143 | ||
1144 | kfifo_free(q->queue); | |
1145 | kfree(q->pool); | |
1146 | kfree(*items); | |
1147 | return -ENOMEM; | |
1148 | } | |
1149 | memset(q->pool[i], 0, item_size); | |
1150 | (*items)[i] = q->pool[i]; | |
1151 | __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*)); | |
1152 | } | |
1153 | return 0; | |
1154 | } | |
1155 | EXPORT_SYMBOL_GPL(iscsi_pool_init); | |
1156 | ||
1157 | void iscsi_pool_free(struct iscsi_queue *q, void **items) | |
1158 | { | |
1159 | int i; | |
1160 | ||
1161 | for (i = 0; i < q->max; i++) | |
1162 | kfree(items[i]); | |
1163 | kfree(q->pool); | |
1164 | kfree(items); | |
1165 | } | |
1166 | EXPORT_SYMBOL_GPL(iscsi_pool_free); | |
1167 | ||
1168 | /* | |
1169 | * iSCSI Session's hostdata organization: | |
1170 | * | |
1171 | * *------------------* <== hostdata_session(host->hostdata) | |
1172 | * | ptr to class sess| | |
1173 | * |------------------| <== iscsi_hostdata(host->hostdata) | |
1174 | * | iscsi_session | | |
1175 | * *------------------* | |
1176 | */ | |
1177 | ||
1178 | #define hostdata_privsize(_sz) (sizeof(unsigned long) + _sz + \ | |
1179 | _sz % sizeof(unsigned long)) | |
1180 | ||
1181 | #define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata)) | |
1182 | ||
1183 | /** | |
1184 | * iscsi_session_setup - create iscsi cls session and host and session | |
1185 | * @scsit: scsi transport template | |
1186 | * @iscsit: iscsi transport template | |
1187 | * @initial_cmdsn: initial CmdSN | |
1188 | * @hostno: host no allocated | |
1189 | * | |
1190 | * This can be used by software iscsi_transports that allocate | |
1191 | * a session per scsi host. | |
1192 | **/ | |
1193 | struct iscsi_cls_session * | |
1194 | iscsi_session_setup(struct iscsi_transport *iscsit, | |
1195 | struct scsi_transport_template *scsit, | |
1196 | int cmd_task_size, int mgmt_task_size, | |
1197 | uint32_t initial_cmdsn, uint32_t *hostno) | |
1198 | { | |
1199 | struct Scsi_Host *shost; | |
1200 | struct iscsi_session *session; | |
1201 | struct iscsi_cls_session *cls_session; | |
1202 | int cmd_i; | |
1203 | ||
1204 | shost = scsi_host_alloc(iscsit->host_template, | |
1205 | hostdata_privsize(sizeof(*session))); | |
1206 | if (!shost) | |
1207 | return NULL; | |
1208 | ||
1209 | shost->max_id = 1; | |
1210 | shost->max_channel = 0; | |
1211 | shost->max_lun = iscsit->max_lun; | |
1212 | shost->max_cmd_len = iscsit->max_cmd_len; | |
1213 | shost->transportt = scsit; | |
1214 | shost->transportt->create_work_queue = 1; | |
1215 | *hostno = shost->host_no; | |
1216 | ||
1217 | session = iscsi_hostdata(shost->hostdata); | |
1218 | memset(session, 0, sizeof(struct iscsi_session)); | |
1219 | session->host = shost; | |
1220 | session->state = ISCSI_STATE_FREE; | |
1221 | session->mgmtpool_max = ISCSI_MGMT_CMDS_MAX; | |
1222 | session->cmds_max = ISCSI_XMIT_CMDS_MAX; | |
1223 | session->cmdsn = initial_cmdsn; | |
1224 | session->exp_cmdsn = initial_cmdsn + 1; | |
1225 | session->max_cmdsn = initial_cmdsn + 1; | |
1226 | session->max_r2t = 1; | |
1227 | session->tt = iscsit; | |
1228 | ||
1229 | /* initialize SCSI PDU commands pool */ | |
1230 | if (iscsi_pool_init(&session->cmdpool, session->cmds_max, | |
1231 | (void***)&session->cmds, | |
1232 | cmd_task_size + sizeof(struct iscsi_cmd_task))) | |
1233 | goto cmdpool_alloc_fail; | |
1234 | ||
1235 | /* pre-format cmds pool with ITT */ | |
1236 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
1237 | struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; | |
1238 | ||
1239 | if (cmd_task_size) | |
1240 | ctask->dd_data = &ctask[1]; | |
1241 | ctask->itt = cmd_i; | |
1242 | } | |
1243 | ||
1244 | spin_lock_init(&session->lock); | |
1245 | INIT_LIST_HEAD(&session->connections); | |
1246 | ||
1247 | /* initialize immediate command pool */ | |
1248 | if (iscsi_pool_init(&session->mgmtpool, session->mgmtpool_max, | |
1249 | (void***)&session->mgmt_cmds, | |
1250 | mgmt_task_size + sizeof(struct iscsi_mgmt_task))) | |
1251 | goto mgmtpool_alloc_fail; | |
1252 | ||
1253 | ||
1254 | /* pre-format immediate cmds pool with ITT */ | |
1255 | for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) { | |
1256 | struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i]; | |
1257 | ||
1258 | if (mgmt_task_size) | |
1259 | mtask->dd_data = &mtask[1]; | |
1260 | mtask->itt = ISCSI_MGMT_ITT_OFFSET + cmd_i; | |
1261 | mtask->data = kmalloc(DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH, | |
1262 | GFP_KERNEL); | |
1263 | if (!mtask->data) { | |
1264 | int j; | |
1265 | ||
1266 | for (j = 0; j < cmd_i; j++) | |
1267 | kfree(session->mgmt_cmds[j]->data); | |
1268 | goto immdata_alloc_fail; | |
1269 | } | |
1270 | } | |
1271 | ||
1272 | if (scsi_add_host(shost, NULL)) | |
1273 | goto add_host_fail; | |
1274 | ||
1275 | cls_session = iscsi_create_session(shost, iscsit, 0); | |
1276 | if (!cls_session) | |
1277 | goto cls_session_fail; | |
1278 | *(unsigned long*)shost->hostdata = (unsigned long)cls_session; | |
1279 | ||
1280 | return cls_session; | |
1281 | ||
1282 | cls_session_fail: | |
1283 | scsi_remove_host(shost); | |
1284 | add_host_fail: | |
1285 | for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) | |
1286 | kfree(session->mgmt_cmds[cmd_i]->data); | |
1287 | immdata_alloc_fail: | |
1288 | iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds); | |
1289 | mgmtpool_alloc_fail: | |
1290 | iscsi_pool_free(&session->cmdpool, (void**)session->cmds); | |
1291 | cmdpool_alloc_fail: | |
1292 | scsi_host_put(shost); | |
1293 | return NULL; | |
1294 | } | |
1295 | EXPORT_SYMBOL_GPL(iscsi_session_setup); | |
1296 | ||
1297 | /** | |
1298 | * iscsi_session_teardown - destroy session, host, and cls_session | |
1299 | * shost: scsi host | |
1300 | * | |
1301 | * This can be used by software iscsi_transports that allocate | |
1302 | * a session per scsi host. | |
1303 | **/ | |
1304 | void iscsi_session_teardown(struct iscsi_cls_session *cls_session) | |
1305 | { | |
1306 | struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); | |
1307 | struct iscsi_session *session = iscsi_hostdata(shost->hostdata); | |
1308 | int cmd_i; | |
1309 | ||
1310 | scsi_remove_host(shost); | |
1311 | ||
1312 | for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) | |
1313 | kfree(session->mgmt_cmds[cmd_i]->data); | |
1314 | ||
1315 | iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds); | |
1316 | iscsi_pool_free(&session->cmdpool, (void**)session->cmds); | |
1317 | ||
1318 | iscsi_destroy_session(cls_session); | |
1319 | scsi_host_put(shost); | |
1320 | } | |
1321 | EXPORT_SYMBOL_GPL(iscsi_session_teardown); | |
1322 | ||
1323 | /** | |
1324 | * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn | |
1325 | * @cls_session: iscsi_cls_session | |
1326 | * @conn_idx: cid | |
1327 | **/ | |
1328 | struct iscsi_cls_conn * | |
1329 | iscsi_conn_setup(struct iscsi_cls_session *cls_session, uint32_t conn_idx) | |
1330 | { | |
1331 | struct iscsi_session *session = class_to_transport_session(cls_session); | |
1332 | struct iscsi_conn *conn; | |
1333 | struct iscsi_cls_conn *cls_conn; | |
1334 | ||
1335 | cls_conn = iscsi_create_conn(cls_session, conn_idx); | |
1336 | if (!cls_conn) | |
1337 | return NULL; | |
1338 | conn = cls_conn->dd_data; | |
1339 | memset(conn, 0, sizeof(*conn)); | |
1340 | ||
1341 | conn->session = session; | |
1342 | conn->cls_conn = cls_conn; | |
1343 | conn->c_stage = ISCSI_CONN_INITIAL_STAGE; | |
1344 | conn->id = conn_idx; | |
1345 | conn->exp_statsn = 0; | |
1346 | conn->tmabort_state = TMABORT_INITIAL; | |
1347 | INIT_LIST_HEAD(&conn->run_list); | |
1348 | INIT_LIST_HEAD(&conn->mgmt_run_list); | |
1349 | ||
1350 | /* initialize general xmit PDU commands queue */ | |
1351 | conn->xmitqueue = kfifo_alloc(session->cmds_max * sizeof(void*), | |
1352 | GFP_KERNEL, NULL); | |
1353 | if (conn->xmitqueue == ERR_PTR(-ENOMEM)) | |
1354 | goto xmitqueue_alloc_fail; | |
1355 | ||
1356 | /* initialize general immediate & non-immediate PDU commands queue */ | |
1357 | conn->immqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*), | |
1358 | GFP_KERNEL, NULL); | |
1359 | if (conn->immqueue == ERR_PTR(-ENOMEM)) | |
1360 | goto immqueue_alloc_fail; | |
1361 | ||
1362 | conn->mgmtqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*), | |
1363 | GFP_KERNEL, NULL); | |
1364 | if (conn->mgmtqueue == ERR_PTR(-ENOMEM)) | |
1365 | goto mgmtqueue_alloc_fail; | |
1366 | ||
1367 | INIT_WORK(&conn->xmitwork, iscsi_xmitworker, conn); | |
1368 | ||
1369 | /* allocate login_mtask used for the login/text sequences */ | |
1370 | spin_lock_bh(&session->lock); | |
1371 | if (!__kfifo_get(session->mgmtpool.queue, | |
1372 | (void*)&conn->login_mtask, | |
1373 | sizeof(void*))) { | |
1374 | spin_unlock_bh(&session->lock); | |
1375 | goto login_mtask_alloc_fail; | |
1376 | } | |
1377 | spin_unlock_bh(&session->lock); | |
1378 | ||
1379 | init_timer(&conn->tmabort_timer); | |
1380 | mutex_init(&conn->xmitmutex); | |
1381 | init_waitqueue_head(&conn->ehwait); | |
1382 | ||
1383 | return cls_conn; | |
1384 | ||
1385 | login_mtask_alloc_fail: | |
1386 | kfifo_free(conn->mgmtqueue); | |
1387 | mgmtqueue_alloc_fail: | |
1388 | kfifo_free(conn->immqueue); | |
1389 | immqueue_alloc_fail: | |
1390 | kfifo_free(conn->xmitqueue); | |
1391 | xmitqueue_alloc_fail: | |
1392 | iscsi_destroy_conn(cls_conn); | |
1393 | return NULL; | |
1394 | } | |
1395 | EXPORT_SYMBOL_GPL(iscsi_conn_setup); | |
1396 | ||
1397 | /** | |
1398 | * iscsi_conn_teardown - teardown iscsi connection | |
1399 | * cls_conn: iscsi class connection | |
1400 | * | |
1401 | * TODO: we may need to make this into a two step process | |
1402 | * like scsi-mls remove + put host | |
1403 | */ | |
1404 | void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn) | |
1405 | { | |
1406 | struct iscsi_conn *conn = cls_conn->dd_data; | |
1407 | struct iscsi_session *session = conn->session; | |
1408 | unsigned long flags; | |
1409 | ||
1410 | mutex_lock(&conn->xmitmutex); | |
1411 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
1412 | if (conn->c_stage == ISCSI_CONN_INITIAL_STAGE) { | |
1413 | if (session->tt->suspend_conn_recv) | |
1414 | session->tt->suspend_conn_recv(conn); | |
1415 | ||
1416 | session->tt->terminate_conn(conn); | |
1417 | } | |
1418 | ||
1419 | spin_lock_bh(&session->lock); | |
1420 | conn->c_stage = ISCSI_CONN_CLEANUP_WAIT; | |
1421 | if (session->leadconn == conn) { | |
1422 | /* | |
1423 | * leading connection? then give up on recovery. | |
1424 | */ | |
1425 | session->state = ISCSI_STATE_TERMINATE; | |
1426 | wake_up(&conn->ehwait); | |
1427 | } | |
1428 | spin_unlock_bh(&session->lock); | |
1429 | ||
1430 | mutex_unlock(&conn->xmitmutex); | |
1431 | ||
1432 | /* | |
1433 | * Block until all in-progress commands for this connection | |
1434 | * time out or fail. | |
1435 | */ | |
1436 | for (;;) { | |
1437 | spin_lock_irqsave(session->host->host_lock, flags); | |
1438 | if (!session->host->host_busy) { /* OK for ERL == 0 */ | |
1439 | spin_unlock_irqrestore(session->host->host_lock, flags); | |
1440 | break; | |
1441 | } | |
1442 | spin_unlock_irqrestore(session->host->host_lock, flags); | |
1443 | msleep_interruptible(500); | |
1444 | printk("conn_destroy(): host_busy %d host_failed %d\n", | |
1445 | session->host->host_busy, session->host->host_failed); | |
1446 | /* | |
1447 | * force eh_abort() to unblock | |
1448 | */ | |
1449 | wake_up(&conn->ehwait); | |
1450 | } | |
1451 | ||
1452 | spin_lock_bh(&session->lock); | |
1453 | __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask, | |
1454 | sizeof(void*)); | |
1455 | list_del(&conn->item); | |
1456 | if (list_empty(&session->connections)) | |
1457 | session->leadconn = NULL; | |
1458 | if (session->leadconn && session->leadconn == conn) | |
1459 | session->leadconn = container_of(session->connections.next, | |
1460 | struct iscsi_conn, item); | |
1461 | ||
1462 | if (session->leadconn == NULL) | |
1463 | /* no connections exits.. reset sequencing */ | |
1464 | session->cmdsn = session->max_cmdsn = session->exp_cmdsn = 1; | |
1465 | spin_unlock_bh(&session->lock); | |
1466 | ||
1467 | kfifo_free(conn->xmitqueue); | |
1468 | kfifo_free(conn->immqueue); | |
1469 | kfifo_free(conn->mgmtqueue); | |
1470 | ||
1471 | iscsi_destroy_conn(cls_conn); | |
1472 | } | |
1473 | EXPORT_SYMBOL_GPL(iscsi_conn_teardown); | |
1474 | ||
1475 | int iscsi_conn_start(struct iscsi_cls_conn *cls_conn) | |
1476 | { | |
1477 | struct iscsi_conn *conn = cls_conn->dd_data; | |
1478 | struct iscsi_session *session = conn->session; | |
1479 | ||
1480 | if (session == NULL) { | |
1481 | printk(KERN_ERR "iscsi: can't start unbound connection\n"); | |
1482 | return -EPERM; | |
1483 | } | |
1484 | ||
1485 | spin_lock_bh(&session->lock); | |
1486 | conn->c_stage = ISCSI_CONN_STARTED; | |
1487 | session->state = ISCSI_STATE_LOGGED_IN; | |
1488 | ||
1489 | switch(conn->stop_stage) { | |
1490 | case STOP_CONN_RECOVER: | |
1491 | /* | |
1492 | * unblock eh_abort() if it is blocked. re-try all | |
1493 | * commands after successful recovery | |
1494 | */ | |
1495 | session->conn_cnt++; | |
1496 | conn->stop_stage = 0; | |
1497 | conn->tmabort_state = TMABORT_INITIAL; | |
1498 | session->age++; | |
1499 | session->recovery_failed = 0; | |
1500 | spin_unlock_bh(&session->lock); | |
1501 | ||
1502 | iscsi_unblock_session(session_to_cls(session)); | |
1503 | wake_up(&conn->ehwait); | |
1504 | return 0; | |
1505 | case STOP_CONN_TERM: | |
1506 | session->conn_cnt++; | |
1507 | conn->stop_stage = 0; | |
1508 | break; | |
1509 | case STOP_CONN_SUSPEND: | |
1510 | conn->stop_stage = 0; | |
1511 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
1512 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
1513 | break; | |
1514 | default: | |
1515 | break; | |
1516 | } | |
1517 | spin_unlock_bh(&session->lock); | |
1518 | ||
1519 | return 0; | |
1520 | } | |
1521 | EXPORT_SYMBOL_GPL(iscsi_conn_start); | |
1522 | ||
1523 | static void | |
1524 | flush_control_queues(struct iscsi_session *session, struct iscsi_conn *conn) | |
1525 | { | |
1526 | struct iscsi_mgmt_task *mtask, *tmp; | |
1527 | ||
1528 | /* handle pending */ | |
1529 | while (__kfifo_get(conn->immqueue, (void*)&mtask, sizeof(void*)) || | |
1530 | __kfifo_get(conn->mgmtqueue, (void*)&mtask, sizeof(void*))) { | |
1531 | if (mtask == conn->login_mtask) | |
1532 | continue; | |
1533 | debug_scsi("flushing pending mgmt task itt 0x%x\n", mtask->itt); | |
1534 | __kfifo_put(session->mgmtpool.queue, (void*)&mtask, | |
1535 | sizeof(void*)); | |
1536 | } | |
1537 | ||
1538 | /* handle running */ | |
1539 | list_for_each_entry_safe(mtask, tmp, &conn->mgmt_run_list, running) { | |
1540 | debug_scsi("flushing running mgmt task itt 0x%x\n", mtask->itt); | |
1541 | if (mtask == conn->login_mtask) | |
1542 | continue; | |
1543 | list_del(&mtask->running); | |
1544 | __kfifo_put(session->mgmtpool.queue, (void*)&conn->mtask, | |
1545 | sizeof(void*)); | |
1546 | } | |
1547 | ||
1548 | conn->mtask = NULL; | |
1549 | } | |
1550 | ||
1551 | /* Fail commands. Mutex and session lock held and recv side suspended */ | |
1552 | static void fail_all_commands(struct iscsi_conn *conn) | |
1553 | { | |
1554 | struct iscsi_cmd_task *ctask, *tmp; | |
1555 | ||
1556 | /* flush pending */ | |
1557 | while (__kfifo_get(conn->xmitqueue, (void*)&ctask, sizeof(void*))) { | |
1558 | debug_scsi("failing pending sc %p itt 0x%x\n", ctask->sc, | |
1559 | ctask->itt); | |
1560 | fail_command(conn, ctask, DID_BUS_BUSY << 16); | |
1561 | } | |
1562 | ||
1563 | /* fail all other running */ | |
1564 | list_for_each_entry_safe(ctask, tmp, &conn->run_list, running) { | |
1565 | debug_scsi("failing in progress sc %p itt 0x%x\n", | |
1566 | ctask->sc, ctask->itt); | |
1567 | fail_command(conn, ctask, DID_BUS_BUSY << 16); | |
1568 | } | |
1569 | ||
1570 | conn->ctask = NULL; | |
1571 | } | |
1572 | ||
1573 | void iscsi_start_session_recovery(struct iscsi_session *session, | |
1574 | struct iscsi_conn *conn, int flag) | |
1575 | { | |
1576 | spin_lock_bh(&session->lock); | |
1577 | if (conn->stop_stage == STOP_CONN_RECOVER || | |
1578 | conn->stop_stage == STOP_CONN_TERM) { | |
1579 | spin_unlock_bh(&session->lock); | |
1580 | return; | |
1581 | } | |
1582 | conn->stop_stage = flag; | |
1583 | spin_unlock_bh(&session->lock); | |
1584 | ||
1585 | if (session->tt->suspend_conn_recv) | |
1586 | session->tt->suspend_conn_recv(conn); | |
1587 | ||
1588 | mutex_lock(&conn->xmitmutex); | |
1589 | spin_lock_bh(&session->lock); | |
1590 | conn->c_stage = ISCSI_CONN_STOPPED; | |
1591 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
1592 | ||
1593 | session->conn_cnt--; | |
1594 | if (session->conn_cnt == 0 || session->leadconn == conn) | |
1595 | session->state = ISCSI_STATE_FAILED; | |
1596 | ||
1597 | spin_unlock_bh(&session->lock); | |
1598 | ||
1599 | session->tt->terminate_conn(conn); | |
1600 | /* | |
1601 | * flush queues. | |
1602 | */ | |
1603 | spin_lock_bh(&session->lock); | |
1604 | fail_all_commands(conn); | |
1605 | flush_control_queues(session, conn); | |
1606 | spin_unlock_bh(&session->lock); | |
1607 | ||
1608 | /* | |
1609 | * for connection level recovery we should not calculate | |
1610 | * header digest. conn->hdr_size used for optimization | |
1611 | * in hdr_extract() and will be re-negotiated at | |
1612 | * set_param() time. | |
1613 | */ | |
1614 | if (flag == STOP_CONN_RECOVER) { | |
1615 | conn->hdrdgst_en = 0; | |
1616 | conn->datadgst_en = 0; | |
1617 | ||
1618 | if (session->state == ISCSI_STATE_FAILED) | |
1619 | iscsi_block_session(session_to_cls(session)); | |
1620 | } | |
1621 | mutex_unlock(&conn->xmitmutex); | |
1622 | } | |
1623 | EXPORT_SYMBOL_GPL(iscsi_start_session_recovery); | |
1624 | ||
1625 | void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) | |
1626 | { | |
1627 | struct iscsi_conn *conn = cls_conn->dd_data; | |
1628 | struct iscsi_session *session = conn->session; | |
1629 | ||
1630 | switch (flag) { | |
1631 | case STOP_CONN_RECOVER: | |
1632 | case STOP_CONN_TERM: | |
1633 | iscsi_start_session_recovery(session, conn, flag); | |
1634 | return; | |
1635 | case STOP_CONN_SUSPEND: | |
1636 | if (session->tt->suspend_conn_recv) | |
1637 | session->tt->suspend_conn_recv(conn); | |
1638 | ||
1639 | mutex_lock(&conn->xmitmutex); | |
1640 | spin_lock_bh(&session->lock); | |
1641 | ||
1642 | conn->stop_stage = flag; | |
1643 | conn->c_stage = ISCSI_CONN_STOPPED; | |
1644 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
1645 | ||
1646 | spin_unlock_bh(&session->lock); | |
1647 | mutex_unlock(&conn->xmitmutex); | |
1648 | break; | |
1649 | default: | |
1650 | printk(KERN_ERR "invalid stop flag %d\n", flag); | |
1651 | } | |
1652 | } | |
1653 | EXPORT_SYMBOL_GPL(iscsi_conn_stop); | |
1654 | ||
1655 | int iscsi_conn_bind(struct iscsi_cls_session *cls_session, | |
1656 | struct iscsi_cls_conn *cls_conn, int is_leading) | |
1657 | { | |
1658 | struct iscsi_session *session = class_to_transport_session(cls_session); | |
1659 | struct iscsi_conn *tmp = ERR_PTR(-EEXIST), *conn = cls_conn->dd_data; | |
1660 | ||
1661 | /* lookup for existing connection */ | |
1662 | spin_lock_bh(&session->lock); | |
1663 | list_for_each_entry(tmp, &session->connections, item) { | |
1664 | if (tmp == conn) { | |
1665 | if (conn->c_stage != ISCSI_CONN_STOPPED || | |
1666 | conn->stop_stage == STOP_CONN_TERM) { | |
1667 | printk(KERN_ERR "iscsi_tcp: can't bind " | |
1668 | "non-stopped connection (%d:%d)\n", | |
1669 | conn->c_stage, conn->stop_stage); | |
1670 | spin_unlock_bh(&session->lock); | |
1671 | return -EIO; | |
1672 | } | |
1673 | break; | |
1674 | } | |
1675 | } | |
1676 | if (tmp != conn) { | |
1677 | /* bind new iSCSI connection to session */ | |
1678 | conn->session = session; | |
1679 | list_add(&conn->item, &session->connections); | |
1680 | } | |
1681 | spin_unlock_bh(&session->lock); | |
1682 | ||
1683 | if (is_leading) | |
1684 | session->leadconn = conn; | |
1685 | ||
1686 | /* | |
1687 | * Unblock xmitworker(), Login Phase will pass through. | |
1688 | */ | |
1689 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
1690 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
1691 | return 0; | |
1692 | } | |
1693 | EXPORT_SYMBOL_GPL(iscsi_conn_bind); | |
1694 | ||
1695 | MODULE_AUTHOR("Mike Christie"); | |
1696 | MODULE_DESCRIPTION("iSCSI library functions"); | |
1697 | MODULE_LICENSE("GPL"); |