diff options
Diffstat (limited to 'drivers/scsi/libiscsi.c')
-rw-r--r-- | drivers/scsi/libiscsi.c | 1697 |
1 files changed, 1697 insertions, 0 deletions
diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c new file mode 100644 index 000000000000..274a1374ab64 --- /dev/null +++ b/drivers/scsi/libiscsi.c | |||
@@ -0,0 +1,1697 @@ | |||
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"); | ||