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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, | |
ffd0436e | 71 | struct iscsi_data *hdr) |
7996a778 MC |
72 | { |
73 | struct iscsi_conn *conn = ctask->conn; | |
74 | ||
75 | memset(hdr, 0, sizeof(struct iscsi_data)); | |
76 | hdr->ttt = cpu_to_be32(ISCSI_RESERVED_TAG); | |
77 | hdr->datasn = cpu_to_be32(ctask->unsol_datasn); | |
78 | ctask->unsol_datasn++; | |
79 | hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; | |
80 | memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); | |
81 | ||
82 | hdr->itt = ctask->hdr->itt; | |
83 | hdr->exp_statsn = cpu_to_be32(conn->exp_statsn); | |
ffd0436e | 84 | hdr->offset = cpu_to_be32(ctask->unsol_offset); |
7996a778 MC |
85 | |
86 | if (ctask->unsol_count > conn->max_xmit_dlength) { | |
87 | hton24(hdr->dlength, conn->max_xmit_dlength); | |
88 | ctask->data_count = conn->max_xmit_dlength; | |
ffd0436e | 89 | ctask->unsol_offset += ctask->data_count; |
7996a778 MC |
90 | hdr->flags = 0; |
91 | } else { | |
92 | hton24(hdr->dlength, ctask->unsol_count); | |
93 | ctask->data_count = ctask->unsol_count; | |
94 | hdr->flags = ISCSI_FLAG_CMD_FINAL; | |
95 | } | |
96 | } | |
97 | EXPORT_SYMBOL_GPL(iscsi_prep_unsolicit_data_pdu); | |
98 | ||
99 | /** | |
100 | * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu | |
101 | * @ctask: iscsi cmd task | |
102 | * | |
103 | * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set | |
104 | * fields like dlength or final based on how much data it sends | |
105 | */ | |
106 | static void iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask) | |
107 | { | |
108 | struct iscsi_conn *conn = ctask->conn; | |
109 | struct iscsi_session *session = conn->session; | |
110 | struct iscsi_cmd *hdr = ctask->hdr; | |
111 | struct scsi_cmnd *sc = ctask->sc; | |
112 | ||
113 | hdr->opcode = ISCSI_OP_SCSI_CMD; | |
114 | hdr->flags = ISCSI_ATTR_SIMPLE; | |
115 | int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun); | |
116 | hdr->itt = ctask->itt | (conn->id << ISCSI_CID_SHIFT) | | |
117 | (session->age << ISCSI_AGE_SHIFT); | |
118 | hdr->data_length = cpu_to_be32(sc->request_bufflen); | |
119 | hdr->cmdsn = cpu_to_be32(session->cmdsn); | |
120 | session->cmdsn++; | |
121 | hdr->exp_statsn = cpu_to_be32(conn->exp_statsn); | |
122 | memcpy(hdr->cdb, sc->cmnd, sc->cmd_len); | |
123 | memset(&hdr->cdb[sc->cmd_len], 0, MAX_COMMAND_SIZE - sc->cmd_len); | |
124 | ||
ffd0436e | 125 | ctask->data_count = 0; |
7996a778 MC |
126 | if (sc->sc_data_direction == DMA_TO_DEVICE) { |
127 | hdr->flags |= ISCSI_FLAG_CMD_WRITE; | |
128 | /* | |
129 | * Write counters: | |
130 | * | |
131 | * imm_count bytes to be sent right after | |
132 | * SCSI PDU Header | |
133 | * | |
134 | * unsol_count bytes(as Data-Out) to be sent | |
135 | * without R2T ack right after | |
136 | * immediate data | |
137 | * | |
138 | * r2t_data_count bytes to be sent via R2T ack's | |
139 | * | |
140 | * pad_count bytes to be sent as zero-padding | |
141 | */ | |
142 | ctask->imm_count = 0; | |
143 | ctask->unsol_count = 0; | |
ffd0436e | 144 | ctask->unsol_offset = 0; |
7996a778 MC |
145 | ctask->unsol_datasn = 0; |
146 | ||
147 | if (session->imm_data_en) { | |
148 | if (ctask->total_length >= session->first_burst) | |
149 | ctask->imm_count = min(session->first_burst, | |
150 | conn->max_xmit_dlength); | |
151 | else | |
152 | ctask->imm_count = min(ctask->total_length, | |
153 | conn->max_xmit_dlength); | |
154 | hton24(ctask->hdr->dlength, ctask->imm_count); | |
155 | } else | |
156 | zero_data(ctask->hdr->dlength); | |
157 | ||
ffd0436e | 158 | if (!session->initial_r2t_en) { |
7996a778 MC |
159 | ctask->unsol_count = min(session->first_burst, |
160 | ctask->total_length) - ctask->imm_count; | |
ffd0436e MC |
161 | ctask->unsol_offset = ctask->imm_count; |
162 | } | |
163 | ||
7996a778 MC |
164 | if (!ctask->unsol_count) |
165 | /* No unsolicit Data-Out's */ | |
166 | ctask->hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
167 | } else { | |
168 | ctask->datasn = 0; | |
169 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
170 | zero_data(hdr->dlength); | |
171 | ||
172 | if (sc->sc_data_direction == DMA_FROM_DEVICE) | |
173 | hdr->flags |= ISCSI_FLAG_CMD_READ; | |
174 | } | |
175 | ||
176 | conn->scsicmd_pdus_cnt++; | |
177 | } | |
178 | EXPORT_SYMBOL_GPL(iscsi_prep_scsi_cmd_pdu); | |
179 | ||
180 | /** | |
181 | * iscsi_complete_command - return command back to scsi-ml | |
7996a778 MC |
182 | * @ctask: iscsi cmd task |
183 | * | |
184 | * Must be called with session lock. | |
185 | * This function returns the scsi command to scsi-ml and returns | |
186 | * the cmd task to the pool of available cmd tasks. | |
187 | */ | |
60ecebf5 | 188 | static void iscsi_complete_command(struct iscsi_cmd_task *ctask) |
7996a778 | 189 | { |
60ecebf5 | 190 | struct iscsi_session *session = ctask->conn->session; |
7996a778 MC |
191 | struct scsi_cmnd *sc = ctask->sc; |
192 | ||
b6c395ed | 193 | ctask->state = ISCSI_TASK_COMPLETED; |
7996a778 MC |
194 | ctask->sc = NULL; |
195 | list_del_init(&ctask->running); | |
196 | __kfifo_put(session->cmdpool.queue, (void*)&ctask, sizeof(void*)); | |
197 | sc->scsi_done(sc); | |
198 | } | |
199 | ||
60ecebf5 MC |
200 | static void __iscsi_get_ctask(struct iscsi_cmd_task *ctask) |
201 | { | |
202 | atomic_inc(&ctask->refcount); | |
203 | } | |
204 | ||
205 | static void iscsi_get_ctask(struct iscsi_cmd_task *ctask) | |
206 | { | |
207 | spin_lock_bh(&ctask->conn->session->lock); | |
208 | __iscsi_get_ctask(ctask); | |
209 | spin_unlock_bh(&ctask->conn->session->lock); | |
210 | } | |
211 | ||
212 | static void __iscsi_put_ctask(struct iscsi_cmd_task *ctask) | |
213 | { | |
214 | struct iscsi_conn *conn = ctask->conn; | |
215 | ||
216 | if (atomic_dec_and_test(&ctask->refcount)) { | |
217 | conn->session->tt->cleanup_cmd_task(conn, ctask); | |
218 | iscsi_complete_command(ctask); | |
219 | } | |
220 | } | |
221 | ||
222 | static void iscsi_put_ctask(struct iscsi_cmd_task *ctask) | |
223 | { | |
224 | spin_lock_bh(&ctask->conn->session->lock); | |
225 | __iscsi_put_ctask(ctask); | |
226 | spin_unlock_bh(&ctask->conn->session->lock); | |
227 | } | |
228 | ||
7996a778 MC |
229 | /** |
230 | * iscsi_cmd_rsp - SCSI Command Response processing | |
231 | * @conn: iscsi connection | |
232 | * @hdr: iscsi header | |
233 | * @ctask: scsi command task | |
234 | * @data: cmd data buffer | |
235 | * @datalen: len of buffer | |
236 | * | |
237 | * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and | |
238 | * then completes the command and task. | |
239 | **/ | |
240 | static int iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
241 | struct iscsi_cmd_task *ctask, char *data, | |
242 | int datalen) | |
243 | { | |
244 | int rc; | |
245 | struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)hdr; | |
246 | struct iscsi_session *session = conn->session; | |
247 | struct scsi_cmnd *sc = ctask->sc; | |
248 | ||
249 | rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr); | |
250 | if (rc) { | |
251 | sc->result = DID_ERROR << 16; | |
252 | goto out; | |
253 | } | |
254 | ||
255 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; | |
256 | ||
257 | sc->result = (DID_OK << 16) | rhdr->cmd_status; | |
258 | ||
259 | if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) { | |
260 | sc->result = DID_ERROR << 16; | |
261 | goto out; | |
262 | } | |
263 | ||
264 | if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) { | |
265 | int senselen; | |
266 | ||
267 | if (datalen < 2) { | |
268 | invalid_datalen: | |
be2df72e OG |
269 | printk(KERN_ERR "iscsi: Got CHECK_CONDITION but " |
270 | "invalid data buffer size of %d\n", datalen); | |
7996a778 MC |
271 | sc->result = DID_BAD_TARGET << 16; |
272 | goto out; | |
273 | } | |
274 | ||
275 | senselen = (data[0] << 8) | data[1]; | |
276 | if (datalen < senselen) | |
277 | goto invalid_datalen; | |
278 | ||
279 | memcpy(sc->sense_buffer, data + 2, | |
280 | min(senselen, SCSI_SENSE_BUFFERSIZE)); | |
281 | debug_scsi("copied %d bytes of sense\n", | |
282 | min(senselen, SCSI_SENSE_BUFFERSIZE)); | |
283 | } | |
284 | ||
285 | if (sc->sc_data_direction == DMA_TO_DEVICE) | |
286 | goto out; | |
287 | ||
288 | if (rhdr->flags & ISCSI_FLAG_CMD_UNDERFLOW) { | |
289 | int res_count = be32_to_cpu(rhdr->residual_count); | |
290 | ||
291 | if (res_count > 0 && res_count <= sc->request_bufflen) | |
292 | sc->resid = res_count; | |
293 | else | |
294 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
295 | } else if (rhdr->flags & ISCSI_FLAG_CMD_BIDI_UNDERFLOW) | |
296 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
297 | else if (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW) | |
298 | sc->resid = be32_to_cpu(rhdr->residual_count); | |
299 | ||
300 | out: | |
301 | debug_scsi("done [sc %lx res %d itt 0x%x]\n", | |
302 | (long)sc, sc->result, ctask->itt); | |
303 | conn->scsirsp_pdus_cnt++; | |
304 | ||
60ecebf5 | 305 | __iscsi_put_ctask(ctask); |
7996a778 MC |
306 | return rc; |
307 | } | |
308 | ||
7ea8b828 MC |
309 | static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr) |
310 | { | |
311 | struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr; | |
312 | ||
313 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
314 | conn->tmfrsp_pdus_cnt++; | |
315 | ||
316 | if (conn->tmabort_state != TMABORT_INITIAL) | |
317 | return; | |
318 | ||
319 | if (tmf->response == ISCSI_TMF_RSP_COMPLETE) | |
320 | conn->tmabort_state = TMABORT_SUCCESS; | |
321 | else if (tmf->response == ISCSI_TMF_RSP_NO_TASK) | |
322 | conn->tmabort_state = TMABORT_NOT_FOUND; | |
323 | else | |
324 | conn->tmabort_state = TMABORT_FAILED; | |
325 | wake_up(&conn->ehwait); | |
326 | } | |
327 | ||
7996a778 MC |
328 | /** |
329 | * __iscsi_complete_pdu - complete pdu | |
330 | * @conn: iscsi conn | |
331 | * @hdr: iscsi header | |
332 | * @data: data buffer | |
333 | * @datalen: len of data buffer | |
334 | * | |
335 | * Completes pdu processing by freeing any resources allocated at | |
336 | * queuecommand or send generic. session lock must be held and verify | |
337 | * itt must have been called. | |
338 | */ | |
339 | int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
340 | char *data, int datalen) | |
341 | { | |
342 | struct iscsi_session *session = conn->session; | |
343 | int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0; | |
344 | struct iscsi_cmd_task *ctask; | |
345 | struct iscsi_mgmt_task *mtask; | |
346 | uint32_t itt; | |
347 | ||
348 | if (hdr->itt != cpu_to_be32(ISCSI_RESERVED_TAG)) | |
349 | itt = hdr->itt & ISCSI_ITT_MASK; | |
350 | else | |
351 | itt = hdr->itt; | |
352 | ||
353 | if (itt < session->cmds_max) { | |
354 | ctask = session->cmds[itt]; | |
355 | ||
356 | debug_scsi("cmdrsp [op 0x%x cid %d itt 0x%x len %d]\n", | |
357 | opcode, conn->id, ctask->itt, datalen); | |
358 | ||
359 | switch(opcode) { | |
360 | case ISCSI_OP_SCSI_CMD_RSP: | |
361 | BUG_ON((void*)ctask != ctask->sc->SCp.ptr); | |
362 | rc = iscsi_scsi_cmd_rsp(conn, hdr, ctask, data, | |
363 | datalen); | |
364 | break; | |
365 | case ISCSI_OP_SCSI_DATA_IN: | |
366 | BUG_ON((void*)ctask != ctask->sc->SCp.ptr); | |
367 | if (hdr->flags & ISCSI_FLAG_DATA_STATUS) { | |
368 | conn->scsirsp_pdus_cnt++; | |
60ecebf5 | 369 | __iscsi_put_ctask(ctask); |
7996a778 MC |
370 | } |
371 | break; | |
372 | case ISCSI_OP_R2T: | |
373 | /* LLD handles this for now */ | |
374 | break; | |
375 | default: | |
376 | rc = ISCSI_ERR_BAD_OPCODE; | |
377 | break; | |
378 | } | |
379 | } else if (itt >= ISCSI_MGMT_ITT_OFFSET && | |
380 | itt < ISCSI_MGMT_ITT_OFFSET + session->mgmtpool_max) { | |
381 | mtask = session->mgmt_cmds[itt - ISCSI_MGMT_ITT_OFFSET]; | |
382 | ||
383 | debug_scsi("immrsp [op 0x%x cid %d itt 0x%x len %d]\n", | |
384 | opcode, conn->id, mtask->itt, datalen); | |
385 | ||
8d2860b3 MC |
386 | rc = iscsi_check_assign_cmdsn(session, |
387 | (struct iscsi_nopin*)hdr); | |
388 | if (rc) | |
389 | goto done; | |
390 | ||
7996a778 | 391 | switch(opcode) { |
8d2860b3 | 392 | case ISCSI_OP_LOGOUT_RSP: |
c8dc1e52 MC |
393 | if (datalen) { |
394 | rc = ISCSI_ERR_PROTO; | |
395 | break; | |
396 | } | |
8d2860b3 MC |
397 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; |
398 | /* fall through */ | |
7996a778 MC |
399 | case ISCSI_OP_LOGIN_RSP: |
400 | case ISCSI_OP_TEXT_RSP: | |
8d2860b3 MC |
401 | /* |
402 | * login related PDU's exp_statsn is handled in | |
403 | * userspace | |
404 | */ | |
40527afe MC |
405 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) |
406 | rc = ISCSI_ERR_CONN_FAILED; | |
7996a778 MC |
407 | list_del(&mtask->running); |
408 | if (conn->login_mtask != mtask) | |
409 | __kfifo_put(session->mgmtpool.queue, | |
410 | (void*)&mtask, sizeof(void*)); | |
411 | break; | |
412 | case ISCSI_OP_SCSI_TMFUNC_RSP: | |
7996a778 MC |
413 | if (datalen) { |
414 | rc = ISCSI_ERR_PROTO; | |
415 | break; | |
416 | } | |
8d2860b3 | 417 | |
7ea8b828 | 418 | iscsi_tmf_rsp(conn, hdr); |
7996a778 MC |
419 | break; |
420 | case ISCSI_OP_NOOP_IN: | |
c8dc1e52 | 421 | if (hdr->ttt != ISCSI_RESERVED_TAG || datalen) { |
7996a778 MC |
422 | rc = ISCSI_ERR_PROTO; |
423 | break; | |
424 | } | |
7996a778 MC |
425 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; |
426 | ||
40527afe MC |
427 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) |
428 | rc = ISCSI_ERR_CONN_FAILED; | |
7996a778 MC |
429 | list_del(&mtask->running); |
430 | if (conn->login_mtask != mtask) | |
431 | __kfifo_put(session->mgmtpool.queue, | |
432 | (void*)&mtask, sizeof(void*)); | |
433 | break; | |
434 | default: | |
435 | rc = ISCSI_ERR_BAD_OPCODE; | |
436 | break; | |
437 | } | |
438 | } else if (itt == ISCSI_RESERVED_TAG) { | |
439 | switch(opcode) { | |
440 | case ISCSI_OP_NOOP_IN: | |
40527afe | 441 | if (datalen) { |
7996a778 | 442 | rc = ISCSI_ERR_PROTO; |
40527afe MC |
443 | break; |
444 | } | |
445 | ||
446 | rc = iscsi_check_assign_cmdsn(session, | |
447 | (struct iscsi_nopin*)hdr); | |
448 | if (rc) | |
449 | break; | |
450 | ||
451 | if (hdr->ttt == ISCSI_RESERVED_TAG) | |
452 | break; | |
453 | ||
454 | if (iscsi_recv_pdu(conn->cls_conn, hdr, NULL, 0)) | |
455 | rc = ISCSI_ERR_CONN_FAILED; | |
7996a778 MC |
456 | break; |
457 | case ISCSI_OP_REJECT: | |
458 | /* we need sth like iscsi_reject_rsp()*/ | |
459 | case ISCSI_OP_ASYNC_EVENT: | |
8d2860b3 | 460 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; |
7996a778 MC |
461 | /* we need sth like iscsi_async_event_rsp() */ |
462 | rc = ISCSI_ERR_BAD_OPCODE; | |
463 | break; | |
464 | default: | |
465 | rc = ISCSI_ERR_BAD_OPCODE; | |
466 | break; | |
467 | } | |
468 | } else | |
469 | rc = ISCSI_ERR_BAD_ITT; | |
470 | ||
8d2860b3 | 471 | done: |
7996a778 MC |
472 | return rc; |
473 | } | |
474 | EXPORT_SYMBOL_GPL(__iscsi_complete_pdu); | |
475 | ||
476 | int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
477 | char *data, int datalen) | |
478 | { | |
479 | int rc; | |
480 | ||
481 | spin_lock(&conn->session->lock); | |
482 | rc = __iscsi_complete_pdu(conn, hdr, data, datalen); | |
483 | spin_unlock(&conn->session->lock); | |
484 | return rc; | |
485 | } | |
486 | EXPORT_SYMBOL_GPL(iscsi_complete_pdu); | |
487 | ||
488 | /* verify itt (itt encoding: age+cid+itt) */ | |
489 | int iscsi_verify_itt(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
490 | uint32_t *ret_itt) | |
491 | { | |
492 | struct iscsi_session *session = conn->session; | |
493 | struct iscsi_cmd_task *ctask; | |
494 | uint32_t itt; | |
495 | ||
496 | if (hdr->itt != cpu_to_be32(ISCSI_RESERVED_TAG)) { | |
497 | if ((hdr->itt & ISCSI_AGE_MASK) != | |
498 | (session->age << ISCSI_AGE_SHIFT)) { | |
be2df72e | 499 | printk(KERN_ERR "iscsi: received itt %x expected " |
7996a778 MC |
500 | "session age (%x)\n", hdr->itt, |
501 | session->age & ISCSI_AGE_MASK); | |
502 | return ISCSI_ERR_BAD_ITT; | |
503 | } | |
504 | ||
505 | if ((hdr->itt & ISCSI_CID_MASK) != | |
506 | (conn->id << ISCSI_CID_SHIFT)) { | |
be2df72e | 507 | printk(KERN_ERR "iscsi: received itt %x, expected " |
7996a778 MC |
508 | "CID (%x)\n", hdr->itt, conn->id); |
509 | return ISCSI_ERR_BAD_ITT; | |
510 | } | |
511 | itt = hdr->itt & ISCSI_ITT_MASK; | |
512 | } else | |
513 | itt = hdr->itt; | |
514 | ||
515 | if (itt < session->cmds_max) { | |
516 | ctask = session->cmds[itt]; | |
517 | ||
518 | if (!ctask->sc) { | |
be2df72e | 519 | printk(KERN_INFO "iscsi: dropping ctask with " |
7996a778 MC |
520 | "itt 0x%x\n", ctask->itt); |
521 | /* force drop */ | |
522 | return ISCSI_ERR_NO_SCSI_CMD; | |
523 | } | |
524 | ||
525 | if (ctask->sc->SCp.phase != session->age) { | |
be2df72e | 526 | printk(KERN_ERR "iscsi: ctask's session age %d, " |
7996a778 MC |
527 | "expected %d\n", ctask->sc->SCp.phase, |
528 | session->age); | |
529 | return ISCSI_ERR_SESSION_FAILED; | |
530 | } | |
531 | } | |
532 | ||
533 | *ret_itt = itt; | |
534 | return 0; | |
535 | } | |
536 | EXPORT_SYMBOL_GPL(iscsi_verify_itt); | |
537 | ||
538 | void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err) | |
539 | { | |
540 | struct iscsi_session *session = conn->session; | |
541 | unsigned long flags; | |
542 | ||
543 | spin_lock_irqsave(&session->lock, flags); | |
656cffc9 MC |
544 | if (session->state == ISCSI_STATE_FAILED) { |
545 | spin_unlock_irqrestore(&session->lock, flags); | |
546 | return; | |
547 | } | |
548 | ||
67a61114 | 549 | if (conn->stop_stage == 0) |
7996a778 MC |
550 | session->state = ISCSI_STATE_FAILED; |
551 | spin_unlock_irqrestore(&session->lock, flags); | |
552 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
553 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
554 | iscsi_conn_error(conn->cls_conn, err); | |
555 | } | |
556 | EXPORT_SYMBOL_GPL(iscsi_conn_failure); | |
557 | ||
558 | /** | |
559 | * iscsi_data_xmit - xmit any command into the scheduled connection | |
560 | * @conn: iscsi connection | |
561 | * | |
562 | * Notes: | |
563 | * The function can return -EAGAIN in which case the caller must | |
564 | * re-schedule it again later or recover. '0' return code means | |
565 | * successful xmit. | |
566 | **/ | |
567 | static int iscsi_data_xmit(struct iscsi_conn *conn) | |
568 | { | |
569 | struct iscsi_transport *tt; | |
3219e529 | 570 | int rc = 0; |
7996a778 MC |
571 | |
572 | if (unlikely(conn->suspend_tx)) { | |
573 | debug_scsi("conn %d Tx suspended!\n", conn->id); | |
3219e529 | 574 | return -ENODATA; |
7996a778 MC |
575 | } |
576 | tt = conn->session->tt; | |
577 | ||
578 | /* | |
579 | * Transmit in the following order: | |
580 | * | |
581 | * 1) un-finished xmit (ctask or mtask) | |
582 | * 2) immediate control PDUs | |
583 | * 3) write data | |
584 | * 4) SCSI commands | |
585 | * 5) non-immediate control PDUs | |
586 | * | |
587 | * No need to lock around __kfifo_get as long as | |
588 | * there's one producer and one consumer. | |
589 | */ | |
590 | ||
591 | BUG_ON(conn->ctask && conn->mtask); | |
592 | ||
593 | if (conn->ctask) { | |
60ecebf5 | 594 | iscsi_get_ctask(conn->ctask); |
3219e529 | 595 | rc = tt->xmit_cmd_task(conn, conn->ctask); |
60ecebf5 | 596 | iscsi_put_ctask(conn->ctask); |
3219e529 | 597 | if (rc) |
7996a778 MC |
598 | goto again; |
599 | /* done with this in-progress ctask */ | |
600 | conn->ctask = NULL; | |
601 | } | |
602 | if (conn->mtask) { | |
3219e529 MC |
603 | rc = tt->xmit_mgmt_task(conn, conn->mtask); |
604 | if (rc) | |
7996a778 MC |
605 | goto again; |
606 | /* done with this in-progress mtask */ | |
607 | conn->mtask = NULL; | |
608 | } | |
609 | ||
610 | /* process immediate first */ | |
611 | if (unlikely(__kfifo_len(conn->immqueue))) { | |
612 | while (__kfifo_get(conn->immqueue, (void*)&conn->mtask, | |
613 | sizeof(void*))) { | |
994442e8 | 614 | spin_lock_bh(&conn->session->lock); |
7996a778 MC |
615 | list_add_tail(&conn->mtask->running, |
616 | &conn->mgmt_run_list); | |
994442e8 | 617 | spin_unlock_bh(&conn->session->lock); |
3219e529 MC |
618 | rc = tt->xmit_mgmt_task(conn, conn->mtask); |
619 | if (rc) | |
7996a778 MC |
620 | goto again; |
621 | } | |
622 | /* done with this mtask */ | |
623 | conn->mtask = NULL; | |
624 | } | |
625 | ||
626 | /* process command queue */ | |
b6c395ed MC |
627 | spin_lock_bh(&conn->session->lock); |
628 | while (!list_empty(&conn->xmitqueue)) { | |
7996a778 MC |
629 | /* |
630 | * iscsi tcp may readd the task to the xmitqueue to send | |
631 | * write data | |
632 | */ | |
b6c395ed MC |
633 | conn->ctask = list_entry(conn->xmitqueue.next, |
634 | struct iscsi_cmd_task, running); | |
635 | conn->ctask->state = ISCSI_TASK_RUNNING; | |
636 | list_move_tail(conn->xmitqueue.next, &conn->run_list); | |
60ecebf5 | 637 | __iscsi_get_ctask(conn->ctask); |
994442e8 | 638 | spin_unlock_bh(&conn->session->lock); |
b6c395ed | 639 | |
3219e529 MC |
640 | rc = tt->xmit_cmd_task(conn, conn->ctask); |
641 | if (rc) | |
7996a778 | 642 | goto again; |
60ecebf5 | 643 | |
b6c395ed | 644 | spin_lock_bh(&conn->session->lock); |
60ecebf5 MC |
645 | __iscsi_put_ctask(conn->ctask); |
646 | if (rc) { | |
647 | spin_unlock_bh(&conn->session->lock); | |
648 | goto again; | |
649 | } | |
7996a778 | 650 | } |
b6c395ed | 651 | spin_unlock_bh(&conn->session->lock); |
7996a778 MC |
652 | /* done with this ctask */ |
653 | conn->ctask = NULL; | |
654 | ||
655 | /* process the rest control plane PDUs, if any */ | |
656 | if (unlikely(__kfifo_len(conn->mgmtqueue))) { | |
657 | while (__kfifo_get(conn->mgmtqueue, (void*)&conn->mtask, | |
658 | sizeof(void*))) { | |
994442e8 | 659 | spin_lock_bh(&conn->session->lock); |
7996a778 MC |
660 | list_add_tail(&conn->mtask->running, |
661 | &conn->mgmt_run_list); | |
994442e8 | 662 | spin_unlock_bh(&conn->session->lock); |
3219e529 MC |
663 | rc = tt->xmit_mgmt_task(conn, conn->mtask); |
664 | if (rc) | |
7996a778 MC |
665 | goto again; |
666 | } | |
667 | /* done with this mtask */ | |
668 | conn->mtask = NULL; | |
669 | } | |
670 | ||
3219e529 | 671 | return -ENODATA; |
7996a778 MC |
672 | |
673 | again: | |
674 | if (unlikely(conn->suspend_tx)) | |
3219e529 | 675 | return -ENODATA; |
7996a778 | 676 | |
3219e529 | 677 | return rc; |
7996a778 MC |
678 | } |
679 | ||
680 | static void iscsi_xmitworker(void *data) | |
681 | { | |
682 | struct iscsi_conn *conn = data; | |
3219e529 | 683 | int rc; |
7996a778 MC |
684 | /* |
685 | * serialize Xmit worker on a per-connection basis. | |
686 | */ | |
687 | mutex_lock(&conn->xmitmutex); | |
3219e529 MC |
688 | do { |
689 | rc = iscsi_data_xmit(conn); | |
690 | } while (rc >= 0 || rc == -EAGAIN); | |
7996a778 MC |
691 | mutex_unlock(&conn->xmitmutex); |
692 | } | |
693 | ||
694 | enum { | |
695 | FAILURE_BAD_HOST = 1, | |
696 | FAILURE_SESSION_FAILED, | |
697 | FAILURE_SESSION_FREED, | |
698 | FAILURE_WINDOW_CLOSED, | |
60ecebf5 | 699 | FAILURE_OOM, |
7996a778 | 700 | FAILURE_SESSION_TERMINATE, |
656cffc9 | 701 | FAILURE_SESSION_IN_RECOVERY, |
7996a778 MC |
702 | FAILURE_SESSION_RECOVERY_TIMEOUT, |
703 | }; | |
704 | ||
705 | int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *)) | |
706 | { | |
707 | struct Scsi_Host *host; | |
708 | int reason = 0; | |
709 | struct iscsi_session *session; | |
710 | struct iscsi_conn *conn; | |
711 | struct iscsi_cmd_task *ctask = NULL; | |
712 | ||
713 | sc->scsi_done = done; | |
714 | sc->result = 0; | |
715 | ||
716 | host = sc->device->host; | |
717 | session = iscsi_hostdata(host->hostdata); | |
718 | ||
719 | spin_lock(&session->lock); | |
720 | ||
656cffc9 MC |
721 | /* |
722 | * ISCSI_STATE_FAILED is a temp. state. The recovery | |
723 | * code will decide what is best to do with command queued | |
724 | * during this time | |
725 | */ | |
726 | if (session->state != ISCSI_STATE_LOGGED_IN && | |
727 | session->state != ISCSI_STATE_FAILED) { | |
728 | /* | |
729 | * to handle the race between when we set the recovery state | |
730 | * and block the session we requeue here (commands could | |
731 | * be entering our queuecommand while a block is starting | |
732 | * up because the block code is not locked) | |
733 | */ | |
734 | if (session->state == ISCSI_STATE_IN_RECOVERY) { | |
735 | reason = FAILURE_SESSION_IN_RECOVERY; | |
67a61114 | 736 | goto reject; |
7996a778 | 737 | } |
656cffc9 MC |
738 | |
739 | if (session->state == ISCSI_STATE_RECOVERY_FAILED) | |
740 | reason = FAILURE_SESSION_RECOVERY_TIMEOUT; | |
741 | else if (session->state == ISCSI_STATE_TERMINATE) | |
742 | reason = FAILURE_SESSION_TERMINATE; | |
743 | else | |
744 | reason = FAILURE_SESSION_FREED; | |
7996a778 MC |
745 | goto fault; |
746 | } | |
747 | ||
748 | /* | |
749 | * Check for iSCSI window and take care of CmdSN wrap-around | |
750 | */ | |
751 | if ((int)(session->max_cmdsn - session->cmdsn) < 0) { | |
752 | reason = FAILURE_WINDOW_CLOSED; | |
753 | goto reject; | |
754 | } | |
755 | ||
756 | conn = session->leadconn; | |
757 | ||
60ecebf5 MC |
758 | if (!__kfifo_get(session->cmdpool.queue, (void*)&ctask, |
759 | sizeof(void*))) { | |
760 | reason = FAILURE_OOM; | |
761 | goto reject; | |
762 | } | |
7996a778 MC |
763 | sc->SCp.phase = session->age; |
764 | sc->SCp.ptr = (char *)ctask; | |
765 | ||
60ecebf5 | 766 | atomic_set(&ctask->refcount, 1); |
b6c395ed | 767 | ctask->state = ISCSI_TASK_PENDING; |
7996a778 MC |
768 | ctask->mtask = NULL; |
769 | ctask->conn = conn; | |
770 | ctask->sc = sc; | |
771 | INIT_LIST_HEAD(&ctask->running); | |
772 | ctask->total_length = sc->request_bufflen; | |
773 | iscsi_prep_scsi_cmd_pdu(ctask); | |
774 | ||
775 | session->tt->init_cmd_task(ctask); | |
776 | ||
b6c395ed | 777 | list_add_tail(&ctask->running, &conn->xmitqueue); |
7996a778 MC |
778 | debug_scsi( |
779 | "ctask enq [%s cid %d sc %lx itt 0x%x len %d cmdsn %d win %d]\n", | |
780 | sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read", | |
781 | conn->id, (long)sc, ctask->itt, sc->request_bufflen, | |
782 | session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1); | |
783 | spin_unlock(&session->lock); | |
784 | ||
785 | scsi_queue_work(host, &conn->xmitwork); | |
786 | return 0; | |
787 | ||
788 | reject: | |
789 | spin_unlock(&session->lock); | |
790 | debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason); | |
791 | return SCSI_MLQUEUE_HOST_BUSY; | |
792 | ||
793 | fault: | |
794 | spin_unlock(&session->lock); | |
be2df72e | 795 | printk(KERN_ERR "iscsi: cmd 0x%x is not queued (%d)\n", |
7996a778 MC |
796 | sc->cmnd[0], reason); |
797 | sc->result = (DID_NO_CONNECT << 16); | |
798 | sc->resid = sc->request_bufflen; | |
799 | sc->scsi_done(sc); | |
800 | return 0; | |
801 | } | |
802 | EXPORT_SYMBOL_GPL(iscsi_queuecommand); | |
803 | ||
804 | int iscsi_change_queue_depth(struct scsi_device *sdev, int depth) | |
805 | { | |
806 | if (depth > ISCSI_MAX_CMD_PER_LUN) | |
807 | depth = ISCSI_MAX_CMD_PER_LUN; | |
808 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); | |
809 | return sdev->queue_depth; | |
810 | } | |
811 | EXPORT_SYMBOL_GPL(iscsi_change_queue_depth); | |
812 | ||
813 | static int | |
814 | iscsi_conn_send_generic(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
815 | char *data, uint32_t data_size) | |
816 | { | |
817 | struct iscsi_session *session = conn->session; | |
818 | struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr; | |
819 | struct iscsi_mgmt_task *mtask; | |
820 | ||
821 | spin_lock_bh(&session->lock); | |
822 | if (session->state == ISCSI_STATE_TERMINATE) { | |
823 | spin_unlock_bh(&session->lock); | |
824 | return -EPERM; | |
825 | } | |
826 | if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) || | |
827 | hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE)) | |
828 | /* | |
829 | * Login and Text are sent serially, in | |
830 | * request-followed-by-response sequence. | |
831 | * Same mtask can be used. Same ITT must be used. | |
832 | * Note that login_mtask is preallocated at conn_create(). | |
833 | */ | |
834 | mtask = conn->login_mtask; | |
835 | else { | |
656cffc9 MC |
836 | BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE); |
837 | BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED); | |
7996a778 | 838 | |
8d2860b3 | 839 | nop->exp_statsn = cpu_to_be32(conn->exp_statsn); |
7996a778 MC |
840 | if (!__kfifo_get(session->mgmtpool.queue, |
841 | (void*)&mtask, sizeof(void*))) { | |
842 | spin_unlock_bh(&session->lock); | |
843 | return -ENOSPC; | |
844 | } | |
845 | } | |
846 | ||
847 | /* | |
8d2860b3 | 848 | * pre-format CmdSN for outgoing PDU. |
7996a778 MC |
849 | */ |
850 | if (hdr->itt != cpu_to_be32(ISCSI_RESERVED_TAG)) { | |
851 | hdr->itt = mtask->itt | (conn->id << ISCSI_CID_SHIFT) | | |
852 | (session->age << ISCSI_AGE_SHIFT); | |
853 | nop->cmdsn = cpu_to_be32(session->cmdsn); | |
854 | if (conn->c_stage == ISCSI_CONN_STARTED && | |
855 | !(hdr->opcode & ISCSI_OP_IMMEDIATE)) | |
856 | session->cmdsn++; | |
857 | } else | |
858 | /* do not advance CmdSN */ | |
859 | nop->cmdsn = cpu_to_be32(session->cmdsn); | |
860 | ||
7996a778 MC |
861 | if (data_size) { |
862 | memcpy(mtask->data, data, data_size); | |
863 | mtask->data_count = data_size; | |
864 | } else | |
865 | mtask->data_count = 0; | |
866 | ||
867 | INIT_LIST_HEAD(&mtask->running); | |
868 | memcpy(mtask->hdr, hdr, sizeof(struct iscsi_hdr)); | |
869 | if (session->tt->init_mgmt_task) | |
870 | session->tt->init_mgmt_task(conn, mtask, data, data_size); | |
871 | spin_unlock_bh(&session->lock); | |
872 | ||
873 | debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n", | |
874 | hdr->opcode, hdr->itt, data_size); | |
875 | ||
876 | /* | |
877 | * since send_pdu() could be called at least from two contexts, | |
878 | * we need to serialize __kfifo_put, so we don't have to take | |
879 | * additional lock on fast data-path | |
880 | */ | |
881 | if (hdr->opcode & ISCSI_OP_IMMEDIATE) | |
882 | __kfifo_put(conn->immqueue, (void*)&mtask, sizeof(void*)); | |
883 | else | |
884 | __kfifo_put(conn->mgmtqueue, (void*)&mtask, sizeof(void*)); | |
885 | ||
886 | scsi_queue_work(session->host, &conn->xmitwork); | |
887 | return 0; | |
888 | } | |
889 | ||
890 | int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr, | |
891 | char *data, uint32_t data_size) | |
892 | { | |
893 | struct iscsi_conn *conn = cls_conn->dd_data; | |
894 | int rc; | |
895 | ||
896 | mutex_lock(&conn->xmitmutex); | |
897 | rc = iscsi_conn_send_generic(conn, hdr, data, data_size); | |
898 | mutex_unlock(&conn->xmitmutex); | |
899 | ||
900 | return rc; | |
901 | } | |
902 | EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu); | |
903 | ||
904 | void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session) | |
905 | { | |
906 | struct iscsi_session *session = class_to_transport_session(cls_session); | |
907 | struct iscsi_conn *conn = session->leadconn; | |
908 | ||
909 | spin_lock_bh(&session->lock); | |
910 | if (session->state != ISCSI_STATE_LOGGED_IN) { | |
656cffc9 | 911 | session->state = ISCSI_STATE_RECOVERY_FAILED; |
7996a778 MC |
912 | if (conn) |
913 | wake_up(&conn->ehwait); | |
914 | } | |
915 | spin_unlock_bh(&session->lock); | |
916 | } | |
917 | EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout); | |
918 | ||
919 | int iscsi_eh_host_reset(struct scsi_cmnd *sc) | |
920 | { | |
921 | struct Scsi_Host *host = sc->device->host; | |
922 | struct iscsi_session *session = iscsi_hostdata(host->hostdata); | |
923 | struct iscsi_conn *conn = session->leadconn; | |
924 | int fail_session = 0; | |
925 | ||
926 | spin_lock_bh(&session->lock); | |
927 | if (session->state == ISCSI_STATE_TERMINATE) { | |
928 | failed: | |
929 | debug_scsi("failing host reset: session terminated " | |
930 | "[CID %d age %d]", conn->id, session->age); | |
931 | spin_unlock_bh(&session->lock); | |
932 | return FAILED; | |
933 | } | |
934 | ||
935 | if (sc->SCp.phase == session->age) { | |
936 | debug_scsi("failing connection CID %d due to SCSI host reset", | |
937 | conn->id); | |
938 | fail_session = 1; | |
939 | } | |
940 | spin_unlock_bh(&session->lock); | |
941 | ||
942 | /* | |
943 | * we drop the lock here but the leadconn cannot be destoyed while | |
944 | * we are in the scsi eh | |
945 | */ | |
656cffc9 | 946 | if (fail_session) |
7996a778 | 947 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
7996a778 MC |
948 | |
949 | debug_scsi("iscsi_eh_host_reset wait for relogin\n"); | |
950 | wait_event_interruptible(conn->ehwait, | |
951 | session->state == ISCSI_STATE_TERMINATE || | |
952 | session->state == ISCSI_STATE_LOGGED_IN || | |
656cffc9 | 953 | session->state == ISCSI_STATE_RECOVERY_FAILED); |
7996a778 MC |
954 | if (signal_pending(current)) |
955 | flush_signals(current); | |
956 | ||
957 | spin_lock_bh(&session->lock); | |
958 | if (session->state == ISCSI_STATE_LOGGED_IN) | |
be2df72e | 959 | printk(KERN_INFO "iscsi: host reset succeeded\n"); |
7996a778 MC |
960 | else |
961 | goto failed; | |
962 | spin_unlock_bh(&session->lock); | |
963 | ||
964 | return SUCCESS; | |
965 | } | |
966 | EXPORT_SYMBOL_GPL(iscsi_eh_host_reset); | |
967 | ||
968 | static void iscsi_tmabort_timedout(unsigned long data) | |
969 | { | |
970 | struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)data; | |
971 | struct iscsi_conn *conn = ctask->conn; | |
972 | struct iscsi_session *session = conn->session; | |
973 | ||
974 | spin_lock(&session->lock); | |
975 | if (conn->tmabort_state == TMABORT_INITIAL) { | |
976 | conn->tmabort_state = TMABORT_TIMEDOUT; | |
977 | debug_scsi("tmabort timedout [sc %p itt 0x%x]\n", | |
978 | ctask->sc, ctask->itt); | |
979 | /* unblock eh_abort() */ | |
980 | wake_up(&conn->ehwait); | |
981 | } | |
982 | spin_unlock(&session->lock); | |
983 | } | |
984 | ||
985 | /* must be called with the mutex lock */ | |
986 | static int iscsi_exec_abort_task(struct scsi_cmnd *sc, | |
987 | struct iscsi_cmd_task *ctask) | |
988 | { | |
989 | struct iscsi_conn *conn = ctask->conn; | |
990 | struct iscsi_session *session = conn->session; | |
991 | struct iscsi_tm *hdr = &conn->tmhdr; | |
992 | int rc; | |
993 | ||
994 | /* | |
995 | * ctask timed out but session is OK requests must be serialized. | |
996 | */ | |
997 | memset(hdr, 0, sizeof(struct iscsi_tm)); | |
998 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
999 | hdr->flags = ISCSI_TM_FUNC_ABORT_TASK; | |
1000 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
1001 | memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); | |
1002 | hdr->rtt = ctask->hdr->itt; | |
1003 | hdr->refcmdsn = ctask->hdr->cmdsn; | |
1004 | ||
1005 | rc = iscsi_conn_send_generic(conn, (struct iscsi_hdr *)hdr, | |
1006 | NULL, 0); | |
1007 | if (rc) { | |
1008 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1009 | debug_scsi("abort sent failure [itt 0x%x] %d", ctask->itt, rc); | |
1010 | return rc; | |
1011 | } | |
1012 | ||
1013 | debug_scsi("abort sent [itt 0x%x]\n", ctask->itt); | |
1014 | ||
1015 | spin_lock_bh(&session->lock); | |
1016 | ctask->mtask = (struct iscsi_mgmt_task *) | |
1017 | session->mgmt_cmds[(hdr->itt & ISCSI_ITT_MASK) - | |
1018 | ISCSI_MGMT_ITT_OFFSET]; | |
1019 | ||
1020 | if (conn->tmabort_state == TMABORT_INITIAL) { | |
1021 | conn->tmfcmd_pdus_cnt++; | |
1022 | conn->tmabort_timer.expires = 10*HZ + jiffies; | |
1023 | conn->tmabort_timer.function = iscsi_tmabort_timedout; | |
1024 | conn->tmabort_timer.data = (unsigned long)ctask; | |
1025 | add_timer(&conn->tmabort_timer); | |
1026 | debug_scsi("abort set timeout [itt 0x%x]", ctask->itt); | |
1027 | } | |
1028 | spin_unlock_bh(&session->lock); | |
1029 | mutex_unlock(&conn->xmitmutex); | |
1030 | ||
1031 | /* | |
1032 | * block eh thread until: | |
1033 | * | |
1034 | * 1) abort response | |
1035 | * 2) abort timeout | |
1036 | * 3) session is terminated or restarted or userspace has | |
1037 | * given up on recovery | |
1038 | */ | |
1039 | wait_event_interruptible(conn->ehwait, | |
1040 | sc->SCp.phase != session->age || | |
1041 | session->state != ISCSI_STATE_LOGGED_IN || | |
656cffc9 | 1042 | conn->tmabort_state != TMABORT_INITIAL); |
7996a778 MC |
1043 | if (signal_pending(current)) |
1044 | flush_signals(current); | |
1045 | del_timer_sync(&conn->tmabort_timer); | |
1046 | ||
1047 | mutex_lock(&conn->xmitmutex); | |
1048 | return 0; | |
1049 | } | |
1050 | ||
1051 | /* | |
1052 | * xmit mutex and session lock must be held | |
1053 | */ | |
b6c395ed MC |
1054 | static struct iscsi_mgmt_task * |
1055 | iscsi_remove_mgmt_task(struct kfifo *fifo, uint32_t itt) | |
1056 | { | |
1057 | int i, nr_tasks = __kfifo_len(fifo) / sizeof(void*); | |
1058 | struct iscsi_mgmt_task *task; | |
1059 | ||
1060 | debug_scsi("searching %d tasks\n", nr_tasks); | |
1061 | ||
1062 | for (i = 0; i < nr_tasks; i++) { | |
1063 | __kfifo_get(fifo, (void*)&task, sizeof(void*)); | |
1064 | debug_scsi("check task %u\n", task->itt); | |
1065 | ||
1066 | if (task->itt == itt) { | |
1067 | debug_scsi("matched task\n"); | |
1068 | return task; | |
1069 | } | |
7996a778 | 1070 | |
b6c395ed MC |
1071 | __kfifo_put(fifo, (void*)&task, sizeof(void*)); |
1072 | } | |
1073 | return NULL; | |
1074 | } | |
7996a778 MC |
1075 | |
1076 | static int iscsi_ctask_mtask_cleanup(struct iscsi_cmd_task *ctask) | |
1077 | { | |
1078 | struct iscsi_conn *conn = ctask->conn; | |
1079 | struct iscsi_session *session = conn->session; | |
1080 | ||
1081 | if (!ctask->mtask) | |
1082 | return -EINVAL; | |
1083 | ||
1084 | if (!iscsi_remove_mgmt_task(conn->immqueue, ctask->mtask->itt)) | |
1085 | list_del(&ctask->mtask->running); | |
1086 | __kfifo_put(session->mgmtpool.queue, (void*)&ctask->mtask, | |
1087 | sizeof(void*)); | |
1088 | ctask->mtask = NULL; | |
1089 | return 0; | |
1090 | } | |
1091 | ||
1092 | /* | |
1093 | * session lock and xmitmutex must be held | |
1094 | */ | |
1095 | static void fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, | |
1096 | int err) | |
1097 | { | |
1098 | struct scsi_cmnd *sc; | |
1099 | ||
7996a778 MC |
1100 | sc = ctask->sc; |
1101 | if (!sc) | |
1102 | return; | |
7ea8b828 MC |
1103 | iscsi_ctask_mtask_cleanup(ctask); |
1104 | ||
7996a778 MC |
1105 | sc->result = err; |
1106 | sc->resid = sc->request_bufflen; | |
60ecebf5 | 1107 | __iscsi_put_ctask(ctask); |
7996a778 MC |
1108 | } |
1109 | ||
1110 | int iscsi_eh_abort(struct scsi_cmnd *sc) | |
1111 | { | |
1112 | struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)sc->SCp.ptr; | |
1113 | struct iscsi_conn *conn = ctask->conn; | |
1114 | struct iscsi_session *session = conn->session; | |
7996a778 MC |
1115 | int rc; |
1116 | ||
1117 | conn->eh_abort_cnt++; | |
1118 | debug_scsi("aborting [sc %p itt 0x%x]\n", sc, ctask->itt); | |
1119 | ||
1120 | mutex_lock(&conn->xmitmutex); | |
1121 | spin_lock_bh(&session->lock); | |
1122 | ||
1123 | /* | |
1124 | * If we are not logged in or we have started a new session | |
1125 | * then let the host reset code handle this | |
1126 | */ | |
1127 | if (session->state != ISCSI_STATE_LOGGED_IN || | |
1128 | sc->SCp.phase != session->age) | |
1129 | goto failed; | |
1130 | ||
1131 | /* ctask completed before time out */ | |
7ea8b828 MC |
1132 | if (!ctask->sc) { |
1133 | spin_unlock_bh(&session->lock); | |
1134 | debug_scsi("sc completed while abort in progress\n"); | |
1135 | goto success_rel_mutex; | |
1136 | } | |
7996a778 MC |
1137 | |
1138 | /* what should we do here ? */ | |
1139 | if (conn->ctask == ctask) { | |
be2df72e OG |
1140 | printk(KERN_INFO "iscsi: sc %p itt 0x%x partially sent. " |
1141 | "Failing abort\n", sc, ctask->itt); | |
7996a778 MC |
1142 | goto failed; |
1143 | } | |
1144 | ||
b6c395ed | 1145 | if (ctask->state == ISCSI_TASK_PENDING) |
7ea8b828 | 1146 | goto success_cleanup; |
7996a778 MC |
1147 | |
1148 | conn->tmabort_state = TMABORT_INITIAL; | |
1149 | ||
1150 | spin_unlock_bh(&session->lock); | |
1151 | rc = iscsi_exec_abort_task(sc, ctask); | |
1152 | spin_lock_bh(&session->lock); | |
1153 | ||
7996a778 MC |
1154 | if (rc || sc->SCp.phase != session->age || |
1155 | session->state != ISCSI_STATE_LOGGED_IN) | |
1156 | goto failed; | |
7ea8b828 | 1157 | iscsi_ctask_mtask_cleanup(ctask); |
7996a778 | 1158 | |
7ea8b828 MC |
1159 | switch (conn->tmabort_state) { |
1160 | case TMABORT_SUCCESS: | |
1161 | goto success_cleanup; | |
1162 | case TMABORT_NOT_FOUND: | |
1163 | if (!ctask->sc) { | |
1164 | /* ctask completed before tmf abort response */ | |
1165 | spin_unlock_bh(&session->lock); | |
1166 | debug_scsi("sc completed while abort in progress\n"); | |
1167 | goto success_rel_mutex; | |
1168 | } | |
1169 | /* fall through */ | |
1170 | default: | |
1171 | /* timedout or failed */ | |
7996a778 MC |
1172 | spin_unlock_bh(&session->lock); |
1173 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1174 | spin_lock_bh(&session->lock); | |
1175 | goto failed; | |
1176 | } | |
1177 | ||
7ea8b828 | 1178 | success_cleanup: |
7996a778 MC |
1179 | debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, ctask->itt); |
1180 | spin_unlock_bh(&session->lock); | |
1181 | ||
1182 | /* | |
1183 | * clean up task if aborted. we have the xmitmutex so grab | |
1184 | * the recv lock as a writer | |
1185 | */ | |
1186 | write_lock_bh(conn->recv_lock); | |
1187 | spin_lock(&session->lock); | |
1188 | fail_command(conn, ctask, DID_ABORT << 16); | |
1189 | spin_unlock(&session->lock); | |
1190 | write_unlock_bh(conn->recv_lock); | |
1191 | ||
7ea8b828 | 1192 | success_rel_mutex: |
7996a778 MC |
1193 | mutex_unlock(&conn->xmitmutex); |
1194 | return SUCCESS; | |
1195 | ||
1196 | failed: | |
1197 | spin_unlock_bh(&session->lock); | |
1198 | mutex_unlock(&conn->xmitmutex); | |
1199 | ||
1200 | debug_scsi("abort failed [sc %lx itt 0x%x]\n", (long)sc, ctask->itt); | |
1201 | return FAILED; | |
1202 | } | |
1203 | EXPORT_SYMBOL_GPL(iscsi_eh_abort); | |
1204 | ||
1205 | int | |
1206 | iscsi_pool_init(struct iscsi_queue *q, int max, void ***items, int item_size) | |
1207 | { | |
1208 | int i; | |
1209 | ||
1210 | *items = kmalloc(max * sizeof(void*), GFP_KERNEL); | |
1211 | if (*items == NULL) | |
1212 | return -ENOMEM; | |
1213 | ||
1214 | q->max = max; | |
1215 | q->pool = kmalloc(max * sizeof(void*), GFP_KERNEL); | |
1216 | if (q->pool == NULL) { | |
1217 | kfree(*items); | |
1218 | return -ENOMEM; | |
1219 | } | |
1220 | ||
1221 | q->queue = kfifo_init((void*)q->pool, max * sizeof(void*), | |
1222 | GFP_KERNEL, NULL); | |
1223 | if (q->queue == ERR_PTR(-ENOMEM)) { | |
1224 | kfree(q->pool); | |
1225 | kfree(*items); | |
1226 | return -ENOMEM; | |
1227 | } | |
1228 | ||
1229 | for (i = 0; i < max; i++) { | |
1230 | q->pool[i] = kmalloc(item_size, GFP_KERNEL); | |
1231 | if (q->pool[i] == NULL) { | |
1232 | int j; | |
1233 | ||
1234 | for (j = 0; j < i; j++) | |
1235 | kfree(q->pool[j]); | |
1236 | ||
1237 | kfifo_free(q->queue); | |
1238 | kfree(q->pool); | |
1239 | kfree(*items); | |
1240 | return -ENOMEM; | |
1241 | } | |
1242 | memset(q->pool[i], 0, item_size); | |
1243 | (*items)[i] = q->pool[i]; | |
1244 | __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*)); | |
1245 | } | |
1246 | return 0; | |
1247 | } | |
1248 | EXPORT_SYMBOL_GPL(iscsi_pool_init); | |
1249 | ||
1250 | void iscsi_pool_free(struct iscsi_queue *q, void **items) | |
1251 | { | |
1252 | int i; | |
1253 | ||
1254 | for (i = 0; i < q->max; i++) | |
1255 | kfree(items[i]); | |
1256 | kfree(q->pool); | |
1257 | kfree(items); | |
1258 | } | |
1259 | EXPORT_SYMBOL_GPL(iscsi_pool_free); | |
1260 | ||
1261 | /* | |
1262 | * iSCSI Session's hostdata organization: | |
1263 | * | |
1264 | * *------------------* <== hostdata_session(host->hostdata) | |
1265 | * | ptr to class sess| | |
1266 | * |------------------| <== iscsi_hostdata(host->hostdata) | |
1267 | * | iscsi_session | | |
1268 | * *------------------* | |
1269 | */ | |
1270 | ||
1271 | #define hostdata_privsize(_sz) (sizeof(unsigned long) + _sz + \ | |
1272 | _sz % sizeof(unsigned long)) | |
1273 | ||
1274 | #define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata)) | |
1275 | ||
1276 | /** | |
1277 | * iscsi_session_setup - create iscsi cls session and host and session | |
1278 | * @scsit: scsi transport template | |
1279 | * @iscsit: iscsi transport template | |
1280 | * @initial_cmdsn: initial CmdSN | |
1281 | * @hostno: host no allocated | |
1282 | * | |
1283 | * This can be used by software iscsi_transports that allocate | |
1284 | * a session per scsi host. | |
1285 | **/ | |
1286 | struct iscsi_cls_session * | |
1287 | iscsi_session_setup(struct iscsi_transport *iscsit, | |
1288 | struct scsi_transport_template *scsit, | |
1289 | int cmd_task_size, int mgmt_task_size, | |
1290 | uint32_t initial_cmdsn, uint32_t *hostno) | |
1291 | { | |
1292 | struct Scsi_Host *shost; | |
1293 | struct iscsi_session *session; | |
1294 | struct iscsi_cls_session *cls_session; | |
1295 | int cmd_i; | |
1296 | ||
1297 | shost = scsi_host_alloc(iscsit->host_template, | |
1298 | hostdata_privsize(sizeof(*session))); | |
1299 | if (!shost) | |
1300 | return NULL; | |
1301 | ||
1302 | shost->max_id = 1; | |
1303 | shost->max_channel = 0; | |
1304 | shost->max_lun = iscsit->max_lun; | |
1305 | shost->max_cmd_len = iscsit->max_cmd_len; | |
1306 | shost->transportt = scsit; | |
1307 | shost->transportt->create_work_queue = 1; | |
1308 | *hostno = shost->host_no; | |
1309 | ||
1310 | session = iscsi_hostdata(shost->hostdata); | |
1311 | memset(session, 0, sizeof(struct iscsi_session)); | |
1312 | session->host = shost; | |
1313 | session->state = ISCSI_STATE_FREE; | |
1314 | session->mgmtpool_max = ISCSI_MGMT_CMDS_MAX; | |
1315 | session->cmds_max = ISCSI_XMIT_CMDS_MAX; | |
1316 | session->cmdsn = initial_cmdsn; | |
1317 | session->exp_cmdsn = initial_cmdsn + 1; | |
1318 | session->max_cmdsn = initial_cmdsn + 1; | |
1319 | session->max_r2t = 1; | |
1320 | session->tt = iscsit; | |
1321 | ||
1322 | /* initialize SCSI PDU commands pool */ | |
1323 | if (iscsi_pool_init(&session->cmdpool, session->cmds_max, | |
1324 | (void***)&session->cmds, | |
1325 | cmd_task_size + sizeof(struct iscsi_cmd_task))) | |
1326 | goto cmdpool_alloc_fail; | |
1327 | ||
1328 | /* pre-format cmds pool with ITT */ | |
1329 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
1330 | struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; | |
1331 | ||
1332 | if (cmd_task_size) | |
1333 | ctask->dd_data = &ctask[1]; | |
1334 | ctask->itt = cmd_i; | |
b6c395ed | 1335 | INIT_LIST_HEAD(&ctask->running); |
7996a778 MC |
1336 | } |
1337 | ||
1338 | spin_lock_init(&session->lock); | |
1339 | INIT_LIST_HEAD(&session->connections); | |
1340 | ||
1341 | /* initialize immediate command pool */ | |
1342 | if (iscsi_pool_init(&session->mgmtpool, session->mgmtpool_max, | |
1343 | (void***)&session->mgmt_cmds, | |
1344 | mgmt_task_size + sizeof(struct iscsi_mgmt_task))) | |
1345 | goto mgmtpool_alloc_fail; | |
1346 | ||
1347 | ||
1348 | /* pre-format immediate cmds pool with ITT */ | |
1349 | for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) { | |
1350 | struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i]; | |
1351 | ||
1352 | if (mgmt_task_size) | |
1353 | mtask->dd_data = &mtask[1]; | |
1354 | mtask->itt = ISCSI_MGMT_ITT_OFFSET + cmd_i; | |
b6c395ed | 1355 | INIT_LIST_HEAD(&mtask->running); |
7996a778 MC |
1356 | } |
1357 | ||
1358 | if (scsi_add_host(shost, NULL)) | |
1359 | goto add_host_fail; | |
1360 | ||
f53a88da MC |
1361 | if (!try_module_get(iscsit->owner)) |
1362 | goto cls_session_fail; | |
1363 | ||
6a8a0d36 | 1364 | cls_session = iscsi_create_session(shost, iscsit, 0); |
7996a778 | 1365 | if (!cls_session) |
f53a88da | 1366 | goto module_put; |
7996a778 MC |
1367 | *(unsigned long*)shost->hostdata = (unsigned long)cls_session; |
1368 | ||
1369 | return cls_session; | |
1370 | ||
f53a88da MC |
1371 | module_put: |
1372 | module_put(iscsit->owner); | |
7996a778 MC |
1373 | cls_session_fail: |
1374 | scsi_remove_host(shost); | |
1375 | add_host_fail: | |
7996a778 MC |
1376 | iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds); |
1377 | mgmtpool_alloc_fail: | |
1378 | iscsi_pool_free(&session->cmdpool, (void**)session->cmds); | |
1379 | cmdpool_alloc_fail: | |
1380 | scsi_host_put(shost); | |
1381 | return NULL; | |
1382 | } | |
1383 | EXPORT_SYMBOL_GPL(iscsi_session_setup); | |
1384 | ||
1385 | /** | |
1386 | * iscsi_session_teardown - destroy session, host, and cls_session | |
1387 | * shost: scsi host | |
1388 | * | |
1389 | * This can be used by software iscsi_transports that allocate | |
1390 | * a session per scsi host. | |
1391 | **/ | |
1392 | void iscsi_session_teardown(struct iscsi_cls_session *cls_session) | |
1393 | { | |
1394 | struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); | |
1395 | struct iscsi_session *session = iscsi_hostdata(shost->hostdata); | |
63f75cc8 | 1396 | struct module *owner = cls_session->transport->owner; |
7996a778 MC |
1397 | |
1398 | scsi_remove_host(shost); | |
1399 | ||
7996a778 MC |
1400 | iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds); |
1401 | iscsi_pool_free(&session->cmdpool, (void**)session->cmds); | |
1402 | ||
f3ff0c36 MC |
1403 | kfree(session->targetname); |
1404 | ||
7996a778 MC |
1405 | iscsi_destroy_session(cls_session); |
1406 | scsi_host_put(shost); | |
63f75cc8 | 1407 | module_put(owner); |
7996a778 MC |
1408 | } |
1409 | EXPORT_SYMBOL_GPL(iscsi_session_teardown); | |
1410 | ||
1411 | /** | |
1412 | * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn | |
1413 | * @cls_session: iscsi_cls_session | |
1414 | * @conn_idx: cid | |
1415 | **/ | |
1416 | struct iscsi_cls_conn * | |
1417 | iscsi_conn_setup(struct iscsi_cls_session *cls_session, uint32_t conn_idx) | |
1418 | { | |
1419 | struct iscsi_session *session = class_to_transport_session(cls_session); | |
1420 | struct iscsi_conn *conn; | |
1421 | struct iscsi_cls_conn *cls_conn; | |
d36ab6f3 | 1422 | char *data; |
7996a778 MC |
1423 | |
1424 | cls_conn = iscsi_create_conn(cls_session, conn_idx); | |
1425 | if (!cls_conn) | |
1426 | return NULL; | |
1427 | conn = cls_conn->dd_data; | |
1428 | memset(conn, 0, sizeof(*conn)); | |
1429 | ||
1430 | conn->session = session; | |
1431 | conn->cls_conn = cls_conn; | |
1432 | conn->c_stage = ISCSI_CONN_INITIAL_STAGE; | |
1433 | conn->id = conn_idx; | |
1434 | conn->exp_statsn = 0; | |
1435 | conn->tmabort_state = TMABORT_INITIAL; | |
1436 | INIT_LIST_HEAD(&conn->run_list); | |
1437 | INIT_LIST_HEAD(&conn->mgmt_run_list); | |
b6c395ed | 1438 | INIT_LIST_HEAD(&conn->xmitqueue); |
7996a778 MC |
1439 | |
1440 | /* initialize general immediate & non-immediate PDU commands queue */ | |
1441 | conn->immqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*), | |
1442 | GFP_KERNEL, NULL); | |
1443 | if (conn->immqueue == ERR_PTR(-ENOMEM)) | |
1444 | goto immqueue_alloc_fail; | |
1445 | ||
1446 | conn->mgmtqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*), | |
1447 | GFP_KERNEL, NULL); | |
1448 | if (conn->mgmtqueue == ERR_PTR(-ENOMEM)) | |
1449 | goto mgmtqueue_alloc_fail; | |
1450 | ||
1451 | INIT_WORK(&conn->xmitwork, iscsi_xmitworker, conn); | |
1452 | ||
1453 | /* allocate login_mtask used for the login/text sequences */ | |
1454 | spin_lock_bh(&session->lock); | |
1455 | if (!__kfifo_get(session->mgmtpool.queue, | |
1456 | (void*)&conn->login_mtask, | |
1457 | sizeof(void*))) { | |
1458 | spin_unlock_bh(&session->lock); | |
1459 | goto login_mtask_alloc_fail; | |
1460 | } | |
1461 | spin_unlock_bh(&session->lock); | |
1462 | ||
d36ab6f3 MC |
1463 | data = kmalloc(DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH, GFP_KERNEL); |
1464 | if (!data) | |
1465 | goto login_mtask_data_alloc_fail; | |
c8dc1e52 | 1466 | conn->login_mtask->data = conn->data = data; |
d36ab6f3 | 1467 | |
7996a778 MC |
1468 | init_timer(&conn->tmabort_timer); |
1469 | mutex_init(&conn->xmitmutex); | |
1470 | init_waitqueue_head(&conn->ehwait); | |
1471 | ||
1472 | return cls_conn; | |
1473 | ||
d36ab6f3 MC |
1474 | login_mtask_data_alloc_fail: |
1475 | __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask, | |
1476 | sizeof(void*)); | |
7996a778 MC |
1477 | login_mtask_alloc_fail: |
1478 | kfifo_free(conn->mgmtqueue); | |
1479 | mgmtqueue_alloc_fail: | |
1480 | kfifo_free(conn->immqueue); | |
1481 | immqueue_alloc_fail: | |
7996a778 MC |
1482 | iscsi_destroy_conn(cls_conn); |
1483 | return NULL; | |
1484 | } | |
1485 | EXPORT_SYMBOL_GPL(iscsi_conn_setup); | |
1486 | ||
1487 | /** | |
1488 | * iscsi_conn_teardown - teardown iscsi connection | |
1489 | * cls_conn: iscsi class connection | |
1490 | * | |
1491 | * TODO: we may need to make this into a two step process | |
1492 | * like scsi-mls remove + put host | |
1493 | */ | |
1494 | void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn) | |
1495 | { | |
1496 | struct iscsi_conn *conn = cls_conn->dd_data; | |
1497 | struct iscsi_session *session = conn->session; | |
1498 | unsigned long flags; | |
1499 | ||
7996a778 | 1500 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); |
67a61114 | 1501 | mutex_lock(&conn->xmitmutex); |
7996a778 MC |
1502 | |
1503 | spin_lock_bh(&session->lock); | |
1504 | conn->c_stage = ISCSI_CONN_CLEANUP_WAIT; | |
1505 | if (session->leadconn == conn) { | |
1506 | /* | |
1507 | * leading connection? then give up on recovery. | |
1508 | */ | |
1509 | session->state = ISCSI_STATE_TERMINATE; | |
1510 | wake_up(&conn->ehwait); | |
1511 | } | |
1512 | spin_unlock_bh(&session->lock); | |
1513 | ||
1514 | mutex_unlock(&conn->xmitmutex); | |
1515 | ||
1516 | /* | |
1517 | * Block until all in-progress commands for this connection | |
1518 | * time out or fail. | |
1519 | */ | |
1520 | for (;;) { | |
1521 | spin_lock_irqsave(session->host->host_lock, flags); | |
1522 | if (!session->host->host_busy) { /* OK for ERL == 0 */ | |
1523 | spin_unlock_irqrestore(session->host->host_lock, flags); | |
1524 | break; | |
1525 | } | |
1526 | spin_unlock_irqrestore(session->host->host_lock, flags); | |
1527 | msleep_interruptible(500); | |
be2df72e OG |
1528 | printk(KERN_INFO "iscsi: scsi conn_destroy(): host_busy %d " |
1529 | "host_failed %d\n", session->host->host_busy, | |
1530 | session->host->host_failed); | |
7996a778 MC |
1531 | /* |
1532 | * force eh_abort() to unblock | |
1533 | */ | |
1534 | wake_up(&conn->ehwait); | |
1535 | } | |
1536 | ||
1537 | spin_lock_bh(&session->lock); | |
c8dc1e52 | 1538 | kfree(conn->data); |
f3ff0c36 | 1539 | kfree(conn->persistent_address); |
7996a778 MC |
1540 | __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask, |
1541 | sizeof(void*)); | |
1542 | list_del(&conn->item); | |
1543 | if (list_empty(&session->connections)) | |
1544 | session->leadconn = NULL; | |
1545 | if (session->leadconn && session->leadconn == conn) | |
1546 | session->leadconn = container_of(session->connections.next, | |
1547 | struct iscsi_conn, item); | |
1548 | ||
1549 | if (session->leadconn == NULL) | |
1550 | /* no connections exits.. reset sequencing */ | |
1551 | session->cmdsn = session->max_cmdsn = session->exp_cmdsn = 1; | |
1552 | spin_unlock_bh(&session->lock); | |
1553 | ||
7996a778 MC |
1554 | kfifo_free(conn->immqueue); |
1555 | kfifo_free(conn->mgmtqueue); | |
1556 | ||
1557 | iscsi_destroy_conn(cls_conn); | |
1558 | } | |
1559 | EXPORT_SYMBOL_GPL(iscsi_conn_teardown); | |
1560 | ||
1561 | int iscsi_conn_start(struct iscsi_cls_conn *cls_conn) | |
1562 | { | |
1563 | struct iscsi_conn *conn = cls_conn->dd_data; | |
1564 | struct iscsi_session *session = conn->session; | |
1565 | ||
ffd0436e | 1566 | if (!session) { |
7996a778 MC |
1567 | printk(KERN_ERR "iscsi: can't start unbound connection\n"); |
1568 | return -EPERM; | |
1569 | } | |
1570 | ||
ffd0436e MC |
1571 | if (session->first_burst > session->max_burst) { |
1572 | printk("iscsi: invalid burst lengths: " | |
1573 | "first_burst %d max_burst %d\n", | |
1574 | session->first_burst, session->max_burst); | |
1575 | return -EINVAL; | |
1576 | } | |
1577 | ||
7996a778 MC |
1578 | spin_lock_bh(&session->lock); |
1579 | conn->c_stage = ISCSI_CONN_STARTED; | |
1580 | session->state = ISCSI_STATE_LOGGED_IN; | |
1581 | ||
1582 | switch(conn->stop_stage) { | |
1583 | case STOP_CONN_RECOVER: | |
1584 | /* | |
1585 | * unblock eh_abort() if it is blocked. re-try all | |
1586 | * commands after successful recovery | |
1587 | */ | |
7996a778 MC |
1588 | conn->stop_stage = 0; |
1589 | conn->tmabort_state = TMABORT_INITIAL; | |
1590 | session->age++; | |
7996a778 MC |
1591 | spin_unlock_bh(&session->lock); |
1592 | ||
1593 | iscsi_unblock_session(session_to_cls(session)); | |
1594 | wake_up(&conn->ehwait); | |
1595 | return 0; | |
1596 | case STOP_CONN_TERM: | |
7996a778 | 1597 | conn->stop_stage = 0; |
7996a778 MC |
1598 | break; |
1599 | default: | |
1600 | break; | |
1601 | } | |
1602 | spin_unlock_bh(&session->lock); | |
1603 | ||
1604 | return 0; | |
1605 | } | |
1606 | EXPORT_SYMBOL_GPL(iscsi_conn_start); | |
1607 | ||
1608 | static void | |
1609 | flush_control_queues(struct iscsi_session *session, struct iscsi_conn *conn) | |
1610 | { | |
1611 | struct iscsi_mgmt_task *mtask, *tmp; | |
1612 | ||
1613 | /* handle pending */ | |
1614 | while (__kfifo_get(conn->immqueue, (void*)&mtask, sizeof(void*)) || | |
1615 | __kfifo_get(conn->mgmtqueue, (void*)&mtask, sizeof(void*))) { | |
1616 | if (mtask == conn->login_mtask) | |
1617 | continue; | |
1618 | debug_scsi("flushing pending mgmt task itt 0x%x\n", mtask->itt); | |
1619 | __kfifo_put(session->mgmtpool.queue, (void*)&mtask, | |
1620 | sizeof(void*)); | |
1621 | } | |
1622 | ||
1623 | /* handle running */ | |
1624 | list_for_each_entry_safe(mtask, tmp, &conn->mgmt_run_list, running) { | |
1625 | debug_scsi("flushing running mgmt task itt 0x%x\n", mtask->itt); | |
ed2abc7f MC |
1626 | list_del(&mtask->running); |
1627 | ||
7996a778 MC |
1628 | if (mtask == conn->login_mtask) |
1629 | continue; | |
ed2abc7f | 1630 | __kfifo_put(session->mgmtpool.queue, (void*)&mtask, |
7996a778 MC |
1631 | sizeof(void*)); |
1632 | } | |
1633 | ||
1634 | conn->mtask = NULL; | |
1635 | } | |
1636 | ||
1637 | /* Fail commands. Mutex and session lock held and recv side suspended */ | |
1638 | static void fail_all_commands(struct iscsi_conn *conn) | |
1639 | { | |
1640 | struct iscsi_cmd_task *ctask, *tmp; | |
1641 | ||
1642 | /* flush pending */ | |
b6c395ed | 1643 | list_for_each_entry_safe(ctask, tmp, &conn->xmitqueue, running) { |
7996a778 MC |
1644 | debug_scsi("failing pending sc %p itt 0x%x\n", ctask->sc, |
1645 | ctask->itt); | |
1646 | fail_command(conn, ctask, DID_BUS_BUSY << 16); | |
1647 | } | |
1648 | ||
1649 | /* fail all other running */ | |
1650 | list_for_each_entry_safe(ctask, tmp, &conn->run_list, running) { | |
1651 | debug_scsi("failing in progress sc %p itt 0x%x\n", | |
1652 | ctask->sc, ctask->itt); | |
1653 | fail_command(conn, ctask, DID_BUS_BUSY << 16); | |
1654 | } | |
1655 | ||
1656 | conn->ctask = NULL; | |
1657 | } | |
1658 | ||
656cffc9 MC |
1659 | static void iscsi_start_session_recovery(struct iscsi_session *session, |
1660 | struct iscsi_conn *conn, int flag) | |
7996a778 | 1661 | { |
ed2abc7f MC |
1662 | int old_stop_stage; |
1663 | ||
7996a778 | 1664 | spin_lock_bh(&session->lock); |
ed2abc7f | 1665 | if (conn->stop_stage == STOP_CONN_TERM) { |
7996a778 MC |
1666 | spin_unlock_bh(&session->lock); |
1667 | return; | |
1668 | } | |
ed2abc7f MC |
1669 | |
1670 | /* | |
1671 | * When this is called for the in_login state, we only want to clean | |
67a61114 MC |
1672 | * up the login task and connection. We do not need to block and set |
1673 | * the recovery state again | |
ed2abc7f | 1674 | */ |
67a61114 MC |
1675 | if (flag == STOP_CONN_TERM) |
1676 | session->state = ISCSI_STATE_TERMINATE; | |
1677 | else if (conn->stop_stage != STOP_CONN_RECOVER) | |
1678 | session->state = ISCSI_STATE_IN_RECOVERY; | |
ed2abc7f MC |
1679 | |
1680 | old_stop_stage = conn->stop_stage; | |
7996a778 | 1681 | conn->stop_stage = flag; |
67a61114 MC |
1682 | conn->c_stage = ISCSI_CONN_STOPPED; |
1683 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
7996a778 MC |
1684 | spin_unlock_bh(&session->lock); |
1685 | ||
1c83469d MC |
1686 | write_lock_bh(conn->recv_lock); |
1687 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
1688 | write_unlock_bh(conn->recv_lock); | |
7996a778 MC |
1689 | |
1690 | mutex_lock(&conn->xmitmutex); | |
7996a778 MC |
1691 | /* |
1692 | * for connection level recovery we should not calculate | |
1693 | * header digest. conn->hdr_size used for optimization | |
1694 | * in hdr_extract() and will be re-negotiated at | |
1695 | * set_param() time. | |
1696 | */ | |
1697 | if (flag == STOP_CONN_RECOVER) { | |
1698 | conn->hdrdgst_en = 0; | |
1699 | conn->datadgst_en = 0; | |
656cffc9 | 1700 | if (session->state == ISCSI_STATE_IN_RECOVERY && |
67a61114 MC |
1701 | old_stop_stage != STOP_CONN_RECOVER) { |
1702 | debug_scsi("blocking session\n"); | |
7996a778 | 1703 | iscsi_block_session(session_to_cls(session)); |
67a61114 | 1704 | } |
7996a778 | 1705 | } |
656cffc9 | 1706 | |
656cffc9 MC |
1707 | /* |
1708 | * flush queues. | |
1709 | */ | |
1710 | spin_lock_bh(&session->lock); | |
1711 | fail_all_commands(conn); | |
1712 | flush_control_queues(session, conn); | |
1713 | spin_unlock_bh(&session->lock); | |
1714 | ||
7996a778 MC |
1715 | mutex_unlock(&conn->xmitmutex); |
1716 | } | |
7996a778 MC |
1717 | |
1718 | void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) | |
1719 | { | |
1720 | struct iscsi_conn *conn = cls_conn->dd_data; | |
1721 | struct iscsi_session *session = conn->session; | |
1722 | ||
1723 | switch (flag) { | |
1724 | case STOP_CONN_RECOVER: | |
1725 | case STOP_CONN_TERM: | |
1726 | iscsi_start_session_recovery(session, conn, flag); | |
8d2860b3 | 1727 | break; |
7996a778 | 1728 | default: |
be2df72e | 1729 | printk(KERN_ERR "iscsi: invalid stop flag %d\n", flag); |
7996a778 MC |
1730 | } |
1731 | } | |
1732 | EXPORT_SYMBOL_GPL(iscsi_conn_stop); | |
1733 | ||
1734 | int iscsi_conn_bind(struct iscsi_cls_session *cls_session, | |
1735 | struct iscsi_cls_conn *cls_conn, int is_leading) | |
1736 | { | |
1737 | struct iscsi_session *session = class_to_transport_session(cls_session); | |
1738 | struct iscsi_conn *tmp = ERR_PTR(-EEXIST), *conn = cls_conn->dd_data; | |
1739 | ||
1740 | /* lookup for existing connection */ | |
1741 | spin_lock_bh(&session->lock); | |
1742 | list_for_each_entry(tmp, &session->connections, item) { | |
1743 | if (tmp == conn) { | |
1744 | if (conn->c_stage != ISCSI_CONN_STOPPED || | |
1745 | conn->stop_stage == STOP_CONN_TERM) { | |
be2df72e | 1746 | printk(KERN_ERR "iscsi: can't bind " |
7996a778 MC |
1747 | "non-stopped connection (%d:%d)\n", |
1748 | conn->c_stage, conn->stop_stage); | |
1749 | spin_unlock_bh(&session->lock); | |
1750 | return -EIO; | |
1751 | } | |
1752 | break; | |
1753 | } | |
1754 | } | |
1755 | if (tmp != conn) { | |
1756 | /* bind new iSCSI connection to session */ | |
1757 | conn->session = session; | |
1758 | list_add(&conn->item, &session->connections); | |
1759 | } | |
1760 | spin_unlock_bh(&session->lock); | |
1761 | ||
1762 | if (is_leading) | |
1763 | session->leadconn = conn; | |
1764 | ||
1765 | /* | |
1766 | * Unblock xmitworker(), Login Phase will pass through. | |
1767 | */ | |
1768 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
1769 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
1770 | return 0; | |
1771 | } | |
1772 | EXPORT_SYMBOL_GPL(iscsi_conn_bind); | |
1773 | ||
a54a52ca MC |
1774 | |
1775 | int iscsi_set_param(struct iscsi_cls_conn *cls_conn, | |
1776 | enum iscsi_param param, char *buf, int buflen) | |
1777 | { | |
1778 | struct iscsi_conn *conn = cls_conn->dd_data; | |
1779 | struct iscsi_session *session = conn->session; | |
1780 | uint32_t value; | |
1781 | ||
1782 | switch(param) { | |
1783 | case ISCSI_PARAM_MAX_RECV_DLENGTH: | |
1784 | sscanf(buf, "%d", &conn->max_recv_dlength); | |
1785 | break; | |
1786 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
1787 | sscanf(buf, "%d", &conn->max_xmit_dlength); | |
1788 | break; | |
1789 | case ISCSI_PARAM_HDRDGST_EN: | |
1790 | sscanf(buf, "%d", &conn->hdrdgst_en); | |
1791 | break; | |
1792 | case ISCSI_PARAM_DATADGST_EN: | |
1793 | sscanf(buf, "%d", &conn->datadgst_en); | |
1794 | break; | |
1795 | case ISCSI_PARAM_INITIAL_R2T_EN: | |
1796 | sscanf(buf, "%d", &session->initial_r2t_en); | |
1797 | break; | |
1798 | case ISCSI_PARAM_MAX_R2T: | |
1799 | sscanf(buf, "%d", &session->max_r2t); | |
1800 | break; | |
1801 | case ISCSI_PARAM_IMM_DATA_EN: | |
1802 | sscanf(buf, "%d", &session->imm_data_en); | |
1803 | break; | |
1804 | case ISCSI_PARAM_FIRST_BURST: | |
1805 | sscanf(buf, "%d", &session->first_burst); | |
1806 | break; | |
1807 | case ISCSI_PARAM_MAX_BURST: | |
1808 | sscanf(buf, "%d", &session->max_burst); | |
1809 | break; | |
1810 | case ISCSI_PARAM_PDU_INORDER_EN: | |
1811 | sscanf(buf, "%d", &session->pdu_inorder_en); | |
1812 | break; | |
1813 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
1814 | sscanf(buf, "%d", &session->dataseq_inorder_en); | |
1815 | break; | |
1816 | case ISCSI_PARAM_ERL: | |
1817 | sscanf(buf, "%d", &session->erl); | |
1818 | break; | |
1819 | case ISCSI_PARAM_IFMARKER_EN: | |
1820 | sscanf(buf, "%d", &value); | |
1821 | BUG_ON(value); | |
1822 | break; | |
1823 | case ISCSI_PARAM_OFMARKER_EN: | |
1824 | sscanf(buf, "%d", &value); | |
1825 | BUG_ON(value); | |
1826 | break; | |
1827 | case ISCSI_PARAM_EXP_STATSN: | |
1828 | sscanf(buf, "%u", &conn->exp_statsn); | |
1829 | break; | |
1830 | case ISCSI_PARAM_TARGET_NAME: | |
1831 | /* this should not change between logins */ | |
1832 | if (session->targetname) | |
1833 | break; | |
1834 | ||
1835 | session->targetname = kstrdup(buf, GFP_KERNEL); | |
1836 | if (!session->targetname) | |
1837 | return -ENOMEM; | |
1838 | break; | |
1839 | case ISCSI_PARAM_TPGT: | |
1840 | sscanf(buf, "%d", &session->tpgt); | |
1841 | break; | |
1842 | case ISCSI_PARAM_PERSISTENT_PORT: | |
1843 | sscanf(buf, "%d", &conn->persistent_port); | |
1844 | break; | |
1845 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
1846 | /* | |
1847 | * this is the address returned in discovery so it should | |
1848 | * not change between logins. | |
1849 | */ | |
1850 | if (conn->persistent_address) | |
1851 | break; | |
1852 | ||
1853 | conn->persistent_address = kstrdup(buf, GFP_KERNEL); | |
1854 | if (!conn->persistent_address) | |
1855 | return -ENOMEM; | |
1856 | break; | |
1857 | default: | |
1858 | return -ENOSYS; | |
1859 | } | |
1860 | ||
1861 | return 0; | |
1862 | } | |
1863 | EXPORT_SYMBOL_GPL(iscsi_set_param); | |
1864 | ||
1865 | int iscsi_session_get_param(struct iscsi_cls_session *cls_session, | |
1866 | enum iscsi_param param, char *buf) | |
1867 | { | |
1868 | struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); | |
1869 | struct iscsi_session *session = iscsi_hostdata(shost->hostdata); | |
1870 | int len; | |
1871 | ||
1872 | switch(param) { | |
1873 | case ISCSI_PARAM_INITIAL_R2T_EN: | |
1874 | len = sprintf(buf, "%d\n", session->initial_r2t_en); | |
1875 | break; | |
1876 | case ISCSI_PARAM_MAX_R2T: | |
1877 | len = sprintf(buf, "%hu\n", session->max_r2t); | |
1878 | break; | |
1879 | case ISCSI_PARAM_IMM_DATA_EN: | |
1880 | len = sprintf(buf, "%d\n", session->imm_data_en); | |
1881 | break; | |
1882 | case ISCSI_PARAM_FIRST_BURST: | |
1883 | len = sprintf(buf, "%u\n", session->first_burst); | |
1884 | break; | |
1885 | case ISCSI_PARAM_MAX_BURST: | |
1886 | len = sprintf(buf, "%u\n", session->max_burst); | |
1887 | break; | |
1888 | case ISCSI_PARAM_PDU_INORDER_EN: | |
1889 | len = sprintf(buf, "%d\n", session->pdu_inorder_en); | |
1890 | break; | |
1891 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
1892 | len = sprintf(buf, "%d\n", session->dataseq_inorder_en); | |
1893 | break; | |
1894 | case ISCSI_PARAM_ERL: | |
1895 | len = sprintf(buf, "%d\n", session->erl); | |
1896 | break; | |
1897 | case ISCSI_PARAM_TARGET_NAME: | |
1898 | len = sprintf(buf, "%s\n", session->targetname); | |
1899 | break; | |
1900 | case ISCSI_PARAM_TPGT: | |
1901 | len = sprintf(buf, "%d\n", session->tpgt); | |
1902 | break; | |
1903 | default: | |
1904 | return -ENOSYS; | |
1905 | } | |
1906 | ||
1907 | return len; | |
1908 | } | |
1909 | EXPORT_SYMBOL_GPL(iscsi_session_get_param); | |
1910 | ||
1911 | int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn, | |
1912 | enum iscsi_param param, char *buf) | |
1913 | { | |
1914 | struct iscsi_conn *conn = cls_conn->dd_data; | |
1915 | int len; | |
1916 | ||
1917 | switch(param) { | |
1918 | case ISCSI_PARAM_MAX_RECV_DLENGTH: | |
1919 | len = sprintf(buf, "%u\n", conn->max_recv_dlength); | |
1920 | break; | |
1921 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
1922 | len = sprintf(buf, "%u\n", conn->max_xmit_dlength); | |
1923 | break; | |
1924 | case ISCSI_PARAM_HDRDGST_EN: | |
1925 | len = sprintf(buf, "%d\n", conn->hdrdgst_en); | |
1926 | break; | |
1927 | case ISCSI_PARAM_DATADGST_EN: | |
1928 | len = sprintf(buf, "%d\n", conn->datadgst_en); | |
1929 | break; | |
1930 | case ISCSI_PARAM_IFMARKER_EN: | |
1931 | len = sprintf(buf, "%d\n", conn->ifmarker_en); | |
1932 | break; | |
1933 | case ISCSI_PARAM_OFMARKER_EN: | |
1934 | len = sprintf(buf, "%d\n", conn->ofmarker_en); | |
1935 | break; | |
1936 | case ISCSI_PARAM_EXP_STATSN: | |
1937 | len = sprintf(buf, "%u\n", conn->exp_statsn); | |
1938 | break; | |
1939 | case ISCSI_PARAM_PERSISTENT_PORT: | |
1940 | len = sprintf(buf, "%d\n", conn->persistent_port); | |
1941 | break; | |
1942 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
1943 | len = sprintf(buf, "%s\n", conn->persistent_address); | |
1944 | break; | |
1945 | default: | |
1946 | return -ENOSYS; | |
1947 | } | |
1948 | ||
1949 | return len; | |
1950 | } | |
1951 | EXPORT_SYMBOL_GPL(iscsi_conn_get_param); | |
1952 | ||
7996a778 MC |
1953 | MODULE_AUTHOR("Mike Christie"); |
1954 | MODULE_DESCRIPTION("iSCSI library functions"); | |
1955 | MODULE_LICENSE("GPL"); |