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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> | |
7996a778 MC |
25 | #include <linux/kfifo.h> |
26 | #include <linux/delay.h> | |
11836572 | 27 | #include <linux/log2.h> |
5a0e3ad6 | 28 | #include <linux/slab.h> |
3f07c014 | 29 | #include <linux/sched/signal.h> |
acf3368f | 30 | #include <linux/module.h> |
8eb00539 | 31 | #include <asm/unaligned.h> |
7996a778 MC |
32 | #include <net/tcp.h> |
33 | #include <scsi/scsi_cmnd.h> | |
34 | #include <scsi/scsi_device.h> | |
35 | #include <scsi/scsi_eh.h> | |
36 | #include <scsi/scsi_tcq.h> | |
37 | #include <scsi/scsi_host.h> | |
38 | #include <scsi/scsi.h> | |
39 | #include <scsi/iscsi_proto.h> | |
40 | #include <scsi/scsi_transport.h> | |
41 | #include <scsi/scsi_transport_iscsi.h> | |
42 | #include <scsi/libiscsi.h> | |
c2332b00 | 43 | #include <trace/events/iscsi.h> |
7996a778 | 44 | |
bd2199d4 EZ |
45 | static int iscsi_dbg_lib_conn; |
46 | module_param_named(debug_libiscsi_conn, iscsi_dbg_lib_conn, int, | |
47 | S_IRUGO | S_IWUSR); | |
48 | MODULE_PARM_DESC(debug_libiscsi_conn, | |
49 | "Turn on debugging for connections in libiscsi module. " | |
50 | "Set to 1 to turn on, and zero to turn off. Default is off."); | |
51 | ||
52 | static int iscsi_dbg_lib_session; | |
53 | module_param_named(debug_libiscsi_session, iscsi_dbg_lib_session, int, | |
54 | S_IRUGO | S_IWUSR); | |
55 | MODULE_PARM_DESC(debug_libiscsi_session, | |
56 | "Turn on debugging for sessions in libiscsi module. " | |
57 | "Set to 1 to turn on, and zero to turn off. Default is off."); | |
58 | ||
59 | static int iscsi_dbg_lib_eh; | |
60 | module_param_named(debug_libiscsi_eh, iscsi_dbg_lib_eh, int, | |
61 | S_IRUGO | S_IWUSR); | |
62 | MODULE_PARM_DESC(debug_libiscsi_eh, | |
63 | "Turn on debugging for error handling in libiscsi module. " | |
64 | "Set to 1 to turn on, and zero to turn off. Default is off."); | |
1b2c7af8 MC |
65 | |
66 | #define ISCSI_DBG_CONN(_conn, dbg_fmt, arg...) \ | |
67 | do { \ | |
bd2199d4 | 68 | if (iscsi_dbg_lib_conn) \ |
1b2c7af8 MC |
69 | iscsi_conn_printk(KERN_INFO, _conn, \ |
70 | "%s " dbg_fmt, \ | |
71 | __func__, ##arg); \ | |
c2332b00 FH |
72 | iscsi_dbg_trace(trace_iscsi_dbg_conn, \ |
73 | &(_conn)->cls_conn->dev, \ | |
74 | "%s " dbg_fmt, __func__, ##arg);\ | |
1b2c7af8 MC |
75 | } while (0); |
76 | ||
77 | #define ISCSI_DBG_SESSION(_session, dbg_fmt, arg...) \ | |
78 | do { \ | |
bd2199d4 EZ |
79 | if (iscsi_dbg_lib_session) \ |
80 | iscsi_session_printk(KERN_INFO, _session, \ | |
81 | "%s " dbg_fmt, \ | |
82 | __func__, ##arg); \ | |
c2332b00 FH |
83 | iscsi_dbg_trace(trace_iscsi_dbg_session, \ |
84 | &(_session)->cls_session->dev, \ | |
85 | "%s " dbg_fmt, __func__, ##arg); \ | |
bd2199d4 EZ |
86 | } while (0); |
87 | ||
88 | #define ISCSI_DBG_EH(_session, dbg_fmt, arg...) \ | |
89 | do { \ | |
90 | if (iscsi_dbg_lib_eh) \ | |
1b2c7af8 MC |
91 | iscsi_session_printk(KERN_INFO, _session, \ |
92 | "%s " dbg_fmt, \ | |
93 | __func__, ##arg); \ | |
c2332b00 FH |
94 | iscsi_dbg_trace(trace_iscsi_dbg_eh, \ |
95 | &(_session)->cls_session->dev, \ | |
96 | "%s " dbg_fmt, __func__, ##arg); \ | |
1b2c7af8 MC |
97 | } while (0); |
98 | ||
32ae763e MC |
99 | inline void iscsi_conn_queue_work(struct iscsi_conn *conn) |
100 | { | |
101 | struct Scsi_Host *shost = conn->session->host; | |
102 | struct iscsi_host *ihost = shost_priv(shost); | |
103 | ||
1336aed1 MC |
104 | if (ihost->workq) |
105 | queue_work(ihost->workq, &conn->xmitwork); | |
32ae763e MC |
106 | } |
107 | EXPORT_SYMBOL_GPL(iscsi_conn_queue_work); | |
108 | ||
4c0ba5d2 MC |
109 | static void __iscsi_update_cmdsn(struct iscsi_session *session, |
110 | uint32_t exp_cmdsn, uint32_t max_cmdsn) | |
7996a778 | 111 | { |
77a23c21 MC |
112 | /* |
113 | * standard specifies this check for when to update expected and | |
114 | * max sequence numbers | |
115 | */ | |
116 | if (iscsi_sna_lt(max_cmdsn, exp_cmdsn - 1)) | |
117 | return; | |
118 | ||
119 | if (exp_cmdsn != session->exp_cmdsn && | |
120 | !iscsi_sna_lt(exp_cmdsn, session->exp_cmdsn)) | |
7996a778 MC |
121 | session->exp_cmdsn = exp_cmdsn; |
122 | ||
77a23c21 | 123 | if (max_cmdsn != session->max_cmdsn && |
46a84c65 | 124 | !iscsi_sna_lt(max_cmdsn, session->max_cmdsn)) |
77a23c21 | 125 | session->max_cmdsn = max_cmdsn; |
7996a778 | 126 | } |
4c0ba5d2 MC |
127 | |
128 | void iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr) | |
129 | { | |
130 | __iscsi_update_cmdsn(session, be32_to_cpu(hdr->exp_cmdsn), | |
131 | be32_to_cpu(hdr->max_cmdsn)); | |
132 | } | |
77a23c21 | 133 | EXPORT_SYMBOL_GPL(iscsi_update_cmdsn); |
7996a778 | 134 | |
577577da MC |
135 | /** |
136 | * iscsi_prep_data_out_pdu - initialize Data-Out | |
137 | * @task: scsi command task | |
138 | * @r2t: R2T info | |
139 | * @hdr: iscsi data in pdu | |
140 | * | |
141 | * Notes: | |
142 | * Initialize Data-Out within this R2T sequence and finds | |
143 | * proper data_offset within this SCSI command. | |
144 | * | |
145 | * This function is called with connection lock taken. | |
146 | **/ | |
147 | void iscsi_prep_data_out_pdu(struct iscsi_task *task, struct iscsi_r2t_info *r2t, | |
148 | struct iscsi_data *hdr) | |
7996a778 | 149 | { |
9c19a7d0 | 150 | struct iscsi_conn *conn = task->conn; |
577577da MC |
151 | unsigned int left = r2t->data_length - r2t->sent; |
152 | ||
153 | task->hdr_len = sizeof(struct iscsi_data); | |
7996a778 MC |
154 | |
155 | memset(hdr, 0, sizeof(struct iscsi_data)); | |
577577da MC |
156 | hdr->ttt = r2t->ttt; |
157 | hdr->datasn = cpu_to_be32(r2t->datasn); | |
158 | r2t->datasn++; | |
7996a778 | 159 | hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; |
55bdabdf | 160 | hdr->lun = task->lun; |
577577da MC |
161 | hdr->itt = task->hdr_itt; |
162 | hdr->exp_statsn = r2t->exp_statsn; | |
163 | hdr->offset = cpu_to_be32(r2t->data_offset + r2t->sent); | |
164 | if (left > conn->max_xmit_dlength) { | |
7996a778 | 165 | hton24(hdr->dlength, conn->max_xmit_dlength); |
577577da | 166 | r2t->data_count = conn->max_xmit_dlength; |
7996a778 MC |
167 | hdr->flags = 0; |
168 | } else { | |
577577da MC |
169 | hton24(hdr->dlength, left); |
170 | r2t->data_count = left; | |
7996a778 MC |
171 | hdr->flags = ISCSI_FLAG_CMD_FINAL; |
172 | } | |
577577da | 173 | conn->dataout_pdus_cnt++; |
7996a778 | 174 | } |
577577da | 175 | EXPORT_SYMBOL_GPL(iscsi_prep_data_out_pdu); |
7996a778 | 176 | |
9c19a7d0 | 177 | static int iscsi_add_hdr(struct iscsi_task *task, unsigned len) |
004d6530 | 178 | { |
9c19a7d0 | 179 | unsigned exp_len = task->hdr_len + len; |
004d6530 | 180 | |
9c19a7d0 | 181 | if (exp_len > task->hdr_max) { |
004d6530 BH |
182 | WARN_ON(1); |
183 | return -EINVAL; | |
184 | } | |
185 | ||
186 | WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */ | |
9c19a7d0 | 187 | task->hdr_len = exp_len; |
004d6530 BH |
188 | return 0; |
189 | } | |
190 | ||
38d1c069 BH |
191 | /* |
192 | * make an extended cdb AHS | |
193 | */ | |
9c19a7d0 | 194 | static int iscsi_prep_ecdb_ahs(struct iscsi_task *task) |
38d1c069 | 195 | { |
9c19a7d0 | 196 | struct scsi_cmnd *cmd = task->sc; |
38d1c069 BH |
197 | unsigned rlen, pad_len; |
198 | unsigned short ahslength; | |
199 | struct iscsi_ecdb_ahdr *ecdb_ahdr; | |
200 | int rc; | |
201 | ||
9c19a7d0 | 202 | ecdb_ahdr = iscsi_next_hdr(task); |
38d1c069 BH |
203 | rlen = cmd->cmd_len - ISCSI_CDB_SIZE; |
204 | ||
205 | BUG_ON(rlen > sizeof(ecdb_ahdr->ecdb)); | |
206 | ahslength = rlen + sizeof(ecdb_ahdr->reserved); | |
207 | ||
208 | pad_len = iscsi_padding(rlen); | |
209 | ||
9c19a7d0 | 210 | rc = iscsi_add_hdr(task, sizeof(ecdb_ahdr->ahslength) + |
38d1c069 BH |
211 | sizeof(ecdb_ahdr->ahstype) + ahslength + pad_len); |
212 | if (rc) | |
213 | return rc; | |
214 | ||
215 | if (pad_len) | |
216 | memset(&ecdb_ahdr->ecdb[rlen], 0, pad_len); | |
217 | ||
218 | ecdb_ahdr->ahslength = cpu_to_be16(ahslength); | |
219 | ecdb_ahdr->ahstype = ISCSI_AHSTYPE_CDB; | |
220 | ecdb_ahdr->reserved = 0; | |
221 | memcpy(ecdb_ahdr->ecdb, cmd->cmnd + ISCSI_CDB_SIZE, rlen); | |
222 | ||
1b2c7af8 MC |
223 | ISCSI_DBG_SESSION(task->conn->session, |
224 | "iscsi_prep_ecdb_ahs: varlen_cdb_len %d " | |
225 | "rlen %d pad_len %d ahs_length %d iscsi_headers_size " | |
226 | "%u\n", cmd->cmd_len, rlen, pad_len, ahslength, | |
227 | task->hdr_len); | |
38d1c069 BH |
228 | return 0; |
229 | } | |
230 | ||
5d12c05e MC |
231 | /** |
232 | * iscsi_check_tmf_restrictions - check if a task is affected by TMF | |
233 | * @task: iscsi task | |
234 | * @opcode: opcode to check for | |
235 | * | |
236 | * During TMF a task has to be checked if it's affected. | |
237 | * All unrelated I/O can be passed through, but I/O to the | |
238 | * affected LUN should be restricted. | |
239 | * If 'fast_abort' is set we won't be sending any I/O to the | |
240 | * affected LUN. | |
241 | * Otherwise the target is waiting for all TTTs to be completed, | |
242 | * so we have to send all outstanding Data-Out PDUs to the target. | |
243 | */ | |
244 | static int iscsi_check_tmf_restrictions(struct iscsi_task *task, int opcode) | |
245 | { | |
246 | struct iscsi_conn *conn = task->conn; | |
247 | struct iscsi_tm *tmf = &conn->tmhdr; | |
9cb78c16 | 248 | u64 hdr_lun; |
5d12c05e MC |
249 | |
250 | if (conn->tmf_state == TMF_INITIAL) | |
251 | return 0; | |
252 | ||
253 | if ((tmf->opcode & ISCSI_OPCODE_MASK) != ISCSI_OP_SCSI_TMFUNC) | |
254 | return 0; | |
255 | ||
256 | switch (ISCSI_TM_FUNC_VALUE(tmf)) { | |
257 | case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: | |
258 | /* | |
259 | * Allow PDUs for unrelated LUNs | |
260 | */ | |
55bdabdf | 261 | hdr_lun = scsilun_to_int(&tmf->lun); |
5d12c05e MC |
262 | if (hdr_lun != task->sc->device->lun) |
263 | return 0; | |
3fe5ae8b MC |
264 | /* fall through */ |
265 | case ISCSI_TM_FUNC_TARGET_WARM_RESET: | |
5d12c05e MC |
266 | /* |
267 | * Fail all SCSI cmd PDUs | |
268 | */ | |
269 | if (opcode != ISCSI_OP_SCSI_DATA_OUT) { | |
270 | iscsi_conn_printk(KERN_INFO, conn, | |
a17037e7 | 271 | "task [op %x itt " |
3fe5ae8b | 272 | "0x%x/0x%x] " |
5d12c05e | 273 | "rejected.\n", |
a17037e7 VP |
274 | opcode, task->itt, |
275 | task->hdr_itt); | |
5d12c05e MC |
276 | return -EACCES; |
277 | } | |
278 | /* | |
279 | * And also all data-out PDUs in response to R2T | |
280 | * if fast_abort is set. | |
281 | */ | |
282 | if (conn->session->fast_abort) { | |
283 | iscsi_conn_printk(KERN_INFO, conn, | |
a17037e7 | 284 | "task [op %x itt " |
3fe5ae8b | 285 | "0x%x/0x%x] fast abort.\n", |
a17037e7 VP |
286 | opcode, task->itt, |
287 | task->hdr_itt); | |
5d12c05e MC |
288 | return -EACCES; |
289 | } | |
290 | break; | |
291 | case ISCSI_TM_FUNC_ABORT_TASK: | |
292 | /* | |
293 | * the caller has already checked if the task | |
294 | * they want to abort was in the pending queue so if | |
295 | * we are here the cmd pdu has gone out already, and | |
296 | * we will only hit this for data-outs | |
297 | */ | |
298 | if (opcode == ISCSI_OP_SCSI_DATA_OUT && | |
299 | task->hdr_itt == tmf->rtt) { | |
300 | ISCSI_DBG_SESSION(conn->session, | |
301 | "Preventing task %x/%x from sending " | |
302 | "data-out due to abort task in " | |
303 | "progress\n", task->itt, | |
304 | task->hdr_itt); | |
305 | return -EACCES; | |
306 | } | |
307 | break; | |
308 | } | |
309 | ||
310 | return 0; | |
311 | } | |
312 | ||
7996a778 MC |
313 | /** |
314 | * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu | |
9c19a7d0 | 315 | * @task: iscsi task |
7996a778 MC |
316 | * |
317 | * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set | |
318 | * fields like dlength or final based on how much data it sends | |
319 | */ | |
9c19a7d0 | 320 | static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task) |
7996a778 | 321 | { |
9c19a7d0 | 322 | struct iscsi_conn *conn = task->conn; |
7996a778 | 323 | struct iscsi_session *session = conn->session; |
9c19a7d0 | 324 | struct scsi_cmnd *sc = task->sc; |
12352183 | 325 | struct iscsi_scsi_req *hdr; |
d77e6535 | 326 | unsigned hdrlength, cmd_len, transfer_length; |
262ef636 | 327 | itt_t itt; |
004d6530 | 328 | int rc; |
7996a778 | 329 | |
5d12c05e MC |
330 | rc = iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_CMD); |
331 | if (rc) | |
332 | return rc; | |
333 | ||
184b57c6 MC |
334 | if (conn->session->tt->alloc_pdu) { |
335 | rc = conn->session->tt->alloc_pdu(task, ISCSI_OP_SCSI_CMD); | |
336 | if (rc) | |
337 | return rc; | |
338 | } | |
12352183 | 339 | hdr = (struct iscsi_scsi_req *)task->hdr; |
262ef636 | 340 | itt = hdr->itt; |
577577da MC |
341 | memset(hdr, 0, sizeof(*hdr)); |
342 | ||
2ff79d52 MC |
343 | if (session->tt->parse_pdu_itt) |
344 | hdr->itt = task->hdr_itt = itt; | |
345 | else | |
346 | hdr->itt = task->hdr_itt = build_itt(task->itt, | |
347 | task->conn->session->age); | |
9c19a7d0 MC |
348 | task->hdr_len = 0; |
349 | rc = iscsi_add_hdr(task, sizeof(*hdr)); | |
004d6530 BH |
350 | if (rc) |
351 | return rc; | |
a8ac6311 OK |
352 | hdr->opcode = ISCSI_OP_SCSI_CMD; |
353 | hdr->flags = ISCSI_ATTR_SIMPLE; | |
55bdabdf AG |
354 | int_to_scsilun(sc->device->lun, &hdr->lun); |
355 | task->lun = hdr->lun; | |
a8ac6311 | 356 | hdr->exp_statsn = cpu_to_be32(conn->exp_statsn); |
38d1c069 BH |
357 | cmd_len = sc->cmd_len; |
358 | if (cmd_len < ISCSI_CDB_SIZE) | |
359 | memset(&hdr->cdb[cmd_len], 0, ISCSI_CDB_SIZE - cmd_len); | |
360 | else if (cmd_len > ISCSI_CDB_SIZE) { | |
9c19a7d0 | 361 | rc = iscsi_prep_ecdb_ahs(task); |
38d1c069 BH |
362 | if (rc) |
363 | return rc; | |
364 | cmd_len = ISCSI_CDB_SIZE; | |
365 | } | |
366 | memcpy(hdr->cdb, sc->cmnd, cmd_len); | |
7996a778 | 367 | |
9c19a7d0 | 368 | task->imm_count = 0; |
55e51eda SG |
369 | if (scsi_get_prot_op(sc) != SCSI_PROT_NORMAL) |
370 | task->protected = true; | |
371 | ||
d77e6535 SG |
372 | transfer_length = scsi_transfer_length(sc); |
373 | hdr->data_length = cpu_to_be32(transfer_length); | |
7996a778 | 374 | if (sc->sc_data_direction == DMA_TO_DEVICE) { |
577577da MC |
375 | struct iscsi_r2t_info *r2t = &task->unsol_r2t; |
376 | ||
7996a778 MC |
377 | hdr->flags |= ISCSI_FLAG_CMD_WRITE; |
378 | /* | |
379 | * Write counters: | |
380 | * | |
381 | * imm_count bytes to be sent right after | |
382 | * SCSI PDU Header | |
383 | * | |
384 | * unsol_count bytes(as Data-Out) to be sent | |
385 | * without R2T ack right after | |
386 | * immediate data | |
387 | * | |
577577da | 388 | * r2t data_length bytes to be sent via R2T ack's |
7996a778 MC |
389 | * |
390 | * pad_count bytes to be sent as zero-padding | |
391 | */ | |
577577da | 392 | memset(r2t, 0, sizeof(*r2t)); |
7996a778 MC |
393 | |
394 | if (session->imm_data_en) { | |
d77e6535 | 395 | if (transfer_length >= session->first_burst) |
9c19a7d0 | 396 | task->imm_count = min(session->first_burst, |
7996a778 MC |
397 | conn->max_xmit_dlength); |
398 | else | |
d77e6535 SG |
399 | task->imm_count = min(transfer_length, |
400 | conn->max_xmit_dlength); | |
9c19a7d0 | 401 | hton24(hdr->dlength, task->imm_count); |
7996a778 | 402 | } else |
a8ac6311 | 403 | zero_data(hdr->dlength); |
7996a778 | 404 | |
ffd0436e | 405 | if (!session->initial_r2t_en) { |
d77e6535 SG |
406 | r2t->data_length = min(session->first_burst, |
407 | transfer_length) - | |
577577da MC |
408 | task->imm_count; |
409 | r2t->data_offset = task->imm_count; | |
410 | r2t->ttt = cpu_to_be32(ISCSI_RESERVED_TAG); | |
411 | r2t->exp_statsn = cpu_to_be32(conn->exp_statsn); | |
ffd0436e MC |
412 | } |
413 | ||
577577da | 414 | if (!task->unsol_r2t.data_length) |
7996a778 | 415 | /* No unsolicit Data-Out's */ |
a8ac6311 | 416 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; |
7996a778 | 417 | } else { |
7996a778 MC |
418 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; |
419 | zero_data(hdr->dlength); | |
420 | ||
421 | if (sc->sc_data_direction == DMA_FROM_DEVICE) | |
422 | hdr->flags |= ISCSI_FLAG_CMD_READ; | |
423 | } | |
424 | ||
004d6530 | 425 | /* calculate size of additional header segments (AHSs) */ |
9c19a7d0 | 426 | hdrlength = task->hdr_len - sizeof(*hdr); |
004d6530 BH |
427 | |
428 | WARN_ON(hdrlength & (ISCSI_PAD_LEN-1)); | |
429 | hdrlength /= ISCSI_PAD_LEN; | |
430 | ||
431 | WARN_ON(hdrlength >= 256); | |
432 | hdr->hlength = hdrlength & 0xFF; | |
96b1f96d | 433 | hdr->cmdsn = task->cmdsn = cpu_to_be32(session->cmdsn); |
004d6530 | 434 | |
577577da | 435 | if (session->tt->init_task && session->tt->init_task(task)) |
052d0144 MC |
436 | return -EIO; |
437 | ||
9c19a7d0 | 438 | task->state = ISCSI_TASK_RUNNING; |
d3305f34 | 439 | session->cmdsn++; |
77a23c21 | 440 | |
a8ac6311 | 441 | conn->scsicmd_pdus_cnt++; |
1b2c7af8 | 442 | ISCSI_DBG_SESSION(session, "iscsi prep [%s cid %d sc %p cdb 0x%x " |
ae3d56d8 | 443 | "itt 0x%x len %d cmdsn %d win %d]\n", |
1b2c7af8 MC |
444 | sc->sc_data_direction == DMA_TO_DEVICE ? |
445 | "write" : "read", conn->id, sc, sc->cmnd[0], | |
d77e6535 | 446 | task->itt, transfer_length, |
1b2c7af8 MC |
447 | session->cmdsn, |
448 | session->max_cmdsn - session->exp_cmdsn + 1); | |
004d6530 | 449 | return 0; |
7996a778 | 450 | } |
7996a778 MC |
451 | |
452 | /** | |
3bbaaad9 | 453 | * iscsi_free_task - free a task |
9c19a7d0 | 454 | * @task: iscsi cmd task |
7996a778 | 455 | * |
659743b0 | 456 | * Must be called with session back_lock. |
3e5c28ad MC |
457 | * This function returns the scsi command to scsi-ml or cleans |
458 | * up mgmt tasks then returns the task to the pool. | |
7996a778 | 459 | */ |
3bbaaad9 | 460 | static void iscsi_free_task(struct iscsi_task *task) |
7996a778 | 461 | { |
9c19a7d0 | 462 | struct iscsi_conn *conn = task->conn; |
c1635cb7 | 463 | struct iscsi_session *session = conn->session; |
9c19a7d0 | 464 | struct scsi_cmnd *sc = task->sc; |
f41d4721 | 465 | int oldstate = task->state; |
7996a778 | 466 | |
4421c9eb MC |
467 | ISCSI_DBG_SESSION(session, "freeing task itt 0x%x state %d sc %p\n", |
468 | task->itt, task->state, task->sc); | |
469 | ||
577577da | 470 | session->tt->cleanup_task(task); |
3bbaaad9 | 471 | task->state = ISCSI_TASK_FREE; |
9c19a7d0 | 472 | task->sc = NULL; |
3e5c28ad | 473 | /* |
9c19a7d0 | 474 | * login task is preallocated so do not free |
3e5c28ad | 475 | */ |
9c19a7d0 | 476 | if (conn->login_task == task) |
3e5c28ad MC |
477 | return; |
478 | ||
7acd72eb | 479 | kfifo_in(&session->cmdpool.queue, (void*)&task, sizeof(void*)); |
052d0144 | 480 | |
3e5c28ad | 481 | if (sc) { |
3e5c28ad MC |
482 | /* SCSI eh reuses commands to verify us */ |
483 | sc->SCp.ptr = NULL; | |
484 | /* | |
f41d4721 MC |
485 | * queue command may call this to free the task, so |
486 | * it will decide how to return sc to scsi-ml. | |
3e5c28ad | 487 | */ |
f41d4721 | 488 | if (oldstate != ISCSI_TASK_REQUEUE_SCSIQ) |
3e5c28ad MC |
489 | sc->scsi_done(sc); |
490 | } | |
7996a778 MC |
491 | } |
492 | ||
913e5bf4 | 493 | void __iscsi_get_task(struct iscsi_task *task) |
60ecebf5 | 494 | { |
6dc618cd | 495 | refcount_inc(&task->refcount); |
60ecebf5 | 496 | } |
913e5bf4 | 497 | EXPORT_SYMBOL_GPL(__iscsi_get_task); |
60ecebf5 | 498 | |
8eea2f55 | 499 | void __iscsi_put_task(struct iscsi_task *task) |
60ecebf5 | 500 | { |
6dc618cd | 501 | if (refcount_dec_and_test(&task->refcount)) |
3bbaaad9 | 502 | iscsi_free_task(task); |
60ecebf5 | 503 | } |
8eea2f55 | 504 | EXPORT_SYMBOL_GPL(__iscsi_put_task); |
60ecebf5 | 505 | |
9c19a7d0 | 506 | void iscsi_put_task(struct iscsi_task *task) |
3e5c28ad | 507 | { |
9c19a7d0 | 508 | struct iscsi_session *session = task->conn->session; |
3e5c28ad | 509 | |
659743b0 SP |
510 | /* regular RX path uses back_lock */ |
511 | spin_lock_bh(&session->back_lock); | |
9c19a7d0 | 512 | __iscsi_put_task(task); |
659743b0 | 513 | spin_unlock_bh(&session->back_lock); |
3e5c28ad | 514 | } |
9c19a7d0 | 515 | EXPORT_SYMBOL_GPL(iscsi_put_task); |
3e5c28ad | 516 | |
3bbaaad9 MC |
517 | /** |
518 | * iscsi_complete_task - finish a task | |
519 | * @task: iscsi cmd task | |
b3cd5050 | 520 | * @state: state to complete task with |
3bbaaad9 | 521 | * |
659743b0 | 522 | * Must be called with session back_lock. |
3bbaaad9 | 523 | */ |
b3cd5050 | 524 | static void iscsi_complete_task(struct iscsi_task *task, int state) |
3bbaaad9 MC |
525 | { |
526 | struct iscsi_conn *conn = task->conn; | |
527 | ||
4421c9eb MC |
528 | ISCSI_DBG_SESSION(conn->session, |
529 | "complete task itt 0x%x state %d sc %p\n", | |
530 | task->itt, task->state, task->sc); | |
b3cd5050 MC |
531 | if (task->state == ISCSI_TASK_COMPLETED || |
532 | task->state == ISCSI_TASK_ABRT_TMF || | |
f41d4721 MC |
533 | task->state == ISCSI_TASK_ABRT_SESS_RECOV || |
534 | task->state == ISCSI_TASK_REQUEUE_SCSIQ) | |
3bbaaad9 MC |
535 | return; |
536 | WARN_ON_ONCE(task->state == ISCSI_TASK_FREE); | |
b3cd5050 | 537 | task->state = state; |
3bbaaad9 | 538 | |
6f8830f5 CL |
539 | spin_lock_bh(&conn->taskqueuelock); |
540 | if (!list_empty(&task->running)) { | |
541 | pr_debug_once("%s while task on list", __func__); | |
3bbaaad9 | 542 | list_del_init(&task->running); |
6f8830f5 CL |
543 | } |
544 | spin_unlock_bh(&conn->taskqueuelock); | |
3bbaaad9 MC |
545 | |
546 | if (conn->task == task) | |
547 | conn->task = NULL; | |
548 | ||
549 | if (conn->ping_task == task) | |
550 | conn->ping_task = NULL; | |
551 | ||
552 | /* release get from queueing */ | |
553 | __iscsi_put_task(task); | |
554 | } | |
555 | ||
4c0ba5d2 MC |
556 | /** |
557 | * iscsi_complete_scsi_task - finish scsi task normally | |
558 | * @task: iscsi task for scsi cmd | |
559 | * @exp_cmdsn: expected cmd sn in cpu format | |
560 | * @max_cmdsn: max cmd sn in cpu format | |
561 | * | |
562 | * This is used when drivers do not need or cannot perform | |
563 | * lower level pdu processing. | |
564 | * | |
659743b0 | 565 | * Called with session back_lock |
4c0ba5d2 MC |
566 | */ |
567 | void iscsi_complete_scsi_task(struct iscsi_task *task, | |
568 | uint32_t exp_cmdsn, uint32_t max_cmdsn) | |
569 | { | |
570 | struct iscsi_conn *conn = task->conn; | |
571 | ||
572 | ISCSI_DBG_SESSION(conn->session, "[itt 0x%x]\n", task->itt); | |
573 | ||
574 | conn->last_recv = jiffies; | |
575 | __iscsi_update_cmdsn(conn->session, exp_cmdsn, max_cmdsn); | |
576 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); | |
577 | } | |
578 | EXPORT_SYMBOL_GPL(iscsi_complete_scsi_task); | |
579 | ||
580 | ||
b3a7ea8d | 581 | /* |
659743b0 | 582 | * session back_lock must be held and if not called for a task that is |
3bbaaad9 MC |
583 | * still pending or from the xmit thread, then xmit thread must |
584 | * be suspended. | |
b3a7ea8d | 585 | */ |
3bbaaad9 | 586 | static void fail_scsi_task(struct iscsi_task *task, int err) |
b3a7ea8d | 587 | { |
3bbaaad9 | 588 | struct iscsi_conn *conn = task->conn; |
b3a7ea8d | 589 | struct scsi_cmnd *sc; |
b3cd5050 | 590 | int state; |
b3a7ea8d | 591 | |
3bbaaad9 MC |
592 | /* |
593 | * if a command completes and we get a successful tmf response | |
594 | * we will hit this because the scsi eh abort code does not take | |
595 | * a ref to the task. | |
596 | */ | |
9c19a7d0 | 597 | sc = task->sc; |
b3a7ea8d MC |
598 | if (!sc) |
599 | return; | |
600 | ||
b3cd5050 | 601 | if (task->state == ISCSI_TASK_PENDING) { |
b3a7ea8d MC |
602 | /* |
603 | * cmd never made it to the xmit thread, so we should not count | |
604 | * the cmd in the sequencing | |
605 | */ | |
606 | conn->session->queued_cmdsn--; | |
b3cd5050 MC |
607 | /* it was never sent so just complete like normal */ |
608 | state = ISCSI_TASK_COMPLETED; | |
609 | } else if (err == DID_TRANSPORT_DISRUPTED) | |
610 | state = ISCSI_TASK_ABRT_SESS_RECOV; | |
611 | else | |
612 | state = ISCSI_TASK_ABRT_TMF; | |
b3a7ea8d | 613 | |
b3cd5050 | 614 | sc->result = err << 16; |
ae3d56d8 | 615 | scsi_set_resid(sc, scsi_bufflen(sc)); |
3e5c28ad | 616 | |
659743b0 SP |
617 | /* regular RX path uses back_lock */ |
618 | spin_lock_bh(&conn->session->back_lock); | |
b3cd5050 | 619 | iscsi_complete_task(task, state); |
659743b0 | 620 | spin_unlock_bh(&conn->session->back_lock); |
b3a7ea8d MC |
621 | } |
622 | ||
3e5c28ad | 623 | static int iscsi_prep_mgmt_task(struct iscsi_conn *conn, |
9c19a7d0 | 624 | struct iscsi_task *task) |
052d0144 MC |
625 | { |
626 | struct iscsi_session *session = conn->session; | |
577577da | 627 | struct iscsi_hdr *hdr = task->hdr; |
052d0144 | 628 | struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr; |
4f704dc0 | 629 | uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK; |
052d0144 MC |
630 | |
631 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) | |
632 | return -ENOTCONN; | |
633 | ||
4f704dc0 | 634 | if (opcode != ISCSI_OP_LOGIN && opcode != ISCSI_OP_TEXT) |
052d0144 MC |
635 | nop->exp_statsn = cpu_to_be32(conn->exp_statsn); |
636 | /* | |
637 | * pre-format CmdSN for outgoing PDU. | |
638 | */ | |
639 | nop->cmdsn = cpu_to_be32(session->cmdsn); | |
640 | if (hdr->itt != RESERVED_ITT) { | |
052d0144 | 641 | /* |
4f704dc0 | 642 | * TODO: We always use immediate for normal session pdus. |
052d0144 MC |
643 | * If we start to send tmfs or nops as non-immediate then |
644 | * we should start checking the cmdsn numbers for mgmt tasks. | |
4f704dc0 MC |
645 | * |
646 | * During discovery sessions iscsid sends TEXT as non immediate, | |
647 | * but we always only send one PDU at a time. | |
052d0144 MC |
648 | */ |
649 | if (conn->c_stage == ISCSI_CONN_STARTED && | |
650 | !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { | |
651 | session->queued_cmdsn++; | |
652 | session->cmdsn++; | |
653 | } | |
654 | } | |
655 | ||
ae15f801 MC |
656 | if (session->tt->init_task && session->tt->init_task(task)) |
657 | return -EIO; | |
052d0144 MC |
658 | |
659 | if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT) | |
660 | session->state = ISCSI_STATE_LOGGING_OUT; | |
661 | ||
577577da | 662 | task->state = ISCSI_TASK_RUNNING; |
1b2c7af8 MC |
663 | ISCSI_DBG_SESSION(session, "mgmtpdu [op 0x%x hdr->itt 0x%x " |
664 | "datalen %d]\n", hdr->opcode & ISCSI_OPCODE_MASK, | |
665 | hdr->itt, task->data_count); | |
052d0144 MC |
666 | return 0; |
667 | } | |
668 | ||
9c19a7d0 | 669 | static struct iscsi_task * |
f6d5180c MC |
670 | __iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
671 | char *data, uint32_t data_size) | |
672 | { | |
673 | struct iscsi_session *session = conn->session; | |
1336aed1 | 674 | struct iscsi_host *ihost = shost_priv(session->host); |
4f704dc0 | 675 | uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK; |
9c19a7d0 | 676 | struct iscsi_task *task; |
262ef636 | 677 | itt_t itt; |
f6d5180c MC |
678 | |
679 | if (session->state == ISCSI_STATE_TERMINATE) | |
680 | return NULL; | |
681 | ||
4f704dc0 | 682 | if (opcode == ISCSI_OP_LOGIN || opcode == ISCSI_OP_TEXT) { |
f6d5180c MC |
683 | /* |
684 | * Login and Text are sent serially, in | |
685 | * request-followed-by-response sequence. | |
3e5c28ad MC |
686 | * Same task can be used. Same ITT must be used. |
687 | * Note that login_task is preallocated at conn_create(). | |
f6d5180c | 688 | */ |
4f704dc0 MC |
689 | if (conn->login_task->state != ISCSI_TASK_FREE) { |
690 | iscsi_conn_printk(KERN_ERR, conn, "Login/Text in " | |
691 | "progress. Cannot start new task.\n"); | |
692 | return NULL; | |
693 | } | |
694 | ||
cbaa4221 MC |
695 | if (data_size > ISCSI_DEF_MAX_RECV_SEG_LEN) { |
696 | iscsi_conn_printk(KERN_ERR, conn, "Invalid buffer len of %u for login task. Max len is %u\n", data_size, ISCSI_DEF_MAX_RECV_SEG_LEN); | |
697 | return NULL; | |
698 | } | |
699 | ||
9c19a7d0 | 700 | task = conn->login_task; |
4f704dc0 | 701 | } else { |
26013ad4 MC |
702 | if (session->state != ISCSI_STATE_LOGGED_IN) |
703 | return NULL; | |
704 | ||
cbaa4221 MC |
705 | if (data_size != 0) { |
706 | iscsi_conn_printk(KERN_ERR, conn, "Can not send data buffer of len %u for op 0x%x\n", data_size, opcode); | |
707 | return NULL; | |
708 | } | |
709 | ||
f6d5180c MC |
710 | BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE); |
711 | BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED); | |
712 | ||
7acd72eb | 713 | if (!kfifo_out(&session->cmdpool.queue, |
9c19a7d0 | 714 | (void*)&task, sizeof(void*))) |
f6d5180c MC |
715 | return NULL; |
716 | } | |
3e5c28ad MC |
717 | /* |
718 | * released in complete pdu for task we expect a response for, and | |
719 | * released by the lld when it has transmitted the task for | |
720 | * pdus we do not expect a response for. | |
721 | */ | |
6dc618cd | 722 | refcount_set(&task->refcount, 1); |
9c19a7d0 MC |
723 | task->conn = conn; |
724 | task->sc = NULL; | |
3bbaaad9 MC |
725 | INIT_LIST_HEAD(&task->running); |
726 | task->state = ISCSI_TASK_PENDING; | |
f6d5180c MC |
727 | |
728 | if (data_size) { | |
9c19a7d0 MC |
729 | memcpy(task->data, data, data_size); |
730 | task->data_count = data_size; | |
f6d5180c | 731 | } else |
9c19a7d0 | 732 | task->data_count = 0; |
f6d5180c | 733 | |
184b57c6 MC |
734 | if (conn->session->tt->alloc_pdu) { |
735 | if (conn->session->tt->alloc_pdu(task, hdr->opcode)) { | |
736 | iscsi_conn_printk(KERN_ERR, conn, "Could not allocate " | |
737 | "pdu for mgmt task.\n"); | |
3bbaaad9 | 738 | goto free_task; |
184b57c6 | 739 | } |
577577da | 740 | } |
184b57c6 | 741 | |
262ef636 | 742 | itt = task->hdr->itt; |
577577da | 743 | task->hdr_len = sizeof(struct iscsi_hdr); |
9c19a7d0 | 744 | memcpy(task->hdr, hdr, sizeof(struct iscsi_hdr)); |
262ef636 MC |
745 | |
746 | if (hdr->itt != RESERVED_ITT) { | |
747 | if (session->tt->parse_pdu_itt) | |
748 | task->hdr->itt = itt; | |
749 | else | |
750 | task->hdr->itt = build_itt(task->itt, | |
751 | task->conn->session->age); | |
752 | } | |
753 | ||
1336aed1 | 754 | if (!ihost->workq) { |
577577da MC |
755 | if (iscsi_prep_mgmt_task(conn, task)) |
756 | goto free_task; | |
052d0144 | 757 | |
9c19a7d0 | 758 | if (session->tt->xmit_task(task)) |
577577da | 759 | goto free_task; |
3bbaaad9 | 760 | } else { |
6f8830f5 | 761 | spin_lock_bh(&conn->taskqueuelock); |
3bbaaad9 | 762 | list_add_tail(&task->running, &conn->mgmtqueue); |
6f8830f5 | 763 | spin_unlock_bh(&conn->taskqueuelock); |
32ae763e | 764 | iscsi_conn_queue_work(conn); |
3bbaaad9 | 765 | } |
052d0144 | 766 | |
9c19a7d0 | 767 | return task; |
577577da MC |
768 | |
769 | free_task: | |
659743b0 | 770 | /* regular RX path uses back_lock */ |
4fa50799 | 771 | spin_lock(&session->back_lock); |
577577da | 772 | __iscsi_put_task(task); |
4fa50799 | 773 | spin_unlock(&session->back_lock); |
577577da | 774 | return NULL; |
f6d5180c MC |
775 | } |
776 | ||
777 | int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr, | |
778 | char *data, uint32_t data_size) | |
779 | { | |
780 | struct iscsi_conn *conn = cls_conn->dd_data; | |
781 | struct iscsi_session *session = conn->session; | |
782 | int err = 0; | |
783 | ||
659743b0 | 784 | spin_lock_bh(&session->frwd_lock); |
f6d5180c MC |
785 | if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size)) |
786 | err = -EPERM; | |
659743b0 | 787 | spin_unlock_bh(&session->frwd_lock); |
f6d5180c MC |
788 | return err; |
789 | } | |
790 | EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu); | |
791 | ||
7996a778 MC |
792 | /** |
793 | * iscsi_cmd_rsp - SCSI Command Response processing | |
794 | * @conn: iscsi connection | |
795 | * @hdr: iscsi header | |
9c19a7d0 | 796 | * @task: scsi command task |
7996a778 MC |
797 | * @data: cmd data buffer |
798 | * @datalen: len of buffer | |
799 | * | |
800 | * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and | |
a656183e | 801 | * then completes the command and task. called under back_lock |
7996a778 | 802 | **/ |
77a23c21 | 803 | static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
9c19a7d0 | 804 | struct iscsi_task *task, char *data, |
77a23c21 | 805 | int datalen) |
7996a778 | 806 | { |
12352183 | 807 | struct iscsi_scsi_rsp *rhdr = (struct iscsi_scsi_rsp *)hdr; |
7996a778 | 808 | struct iscsi_session *session = conn->session; |
9c19a7d0 | 809 | struct scsi_cmnd *sc = task->sc; |
7996a778 | 810 | |
77a23c21 | 811 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr); |
7996a778 MC |
812 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; |
813 | ||
814 | sc->result = (DID_OK << 16) | rhdr->cmd_status; | |
815 | ||
55e51eda SG |
816 | if (task->protected) { |
817 | sector_t sector; | |
818 | u8 ascq; | |
819 | ||
820 | /** | |
821 | * Transports that didn't implement check_protection | |
822 | * callback but still published T10-PI support to scsi-mid | |
823 | * deserve this BUG_ON. | |
824 | **/ | |
825 | BUG_ON(!session->tt->check_protection); | |
826 | ||
827 | ascq = session->tt->check_protection(task, §or); | |
828 | if (ascq) { | |
829 | sc->result = DRIVER_SENSE << 24 | | |
830 | SAM_STAT_CHECK_CONDITION; | |
831 | scsi_build_sense_buffer(1, sc->sense_buffer, | |
832 | ILLEGAL_REQUEST, 0x10, ascq); | |
a73c2a2f SG |
833 | scsi_set_sense_information(sc->sense_buffer, |
834 | SCSI_SENSE_BUFFERSIZE, | |
835 | sector); | |
55e51eda SG |
836 | goto out; |
837 | } | |
838 | } | |
839 | ||
7996a778 MC |
840 | if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) { |
841 | sc->result = DID_ERROR << 16; | |
842 | goto out; | |
843 | } | |
844 | ||
845 | if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) { | |
9b80cb4b | 846 | uint16_t senselen; |
7996a778 MC |
847 | |
848 | if (datalen < 2) { | |
849 | invalid_datalen: | |
322d739d MC |
850 | iscsi_conn_printk(KERN_ERR, conn, |
851 | "Got CHECK_CONDITION but invalid data " | |
852 | "buffer size of %d\n", datalen); | |
7996a778 MC |
853 | sc->result = DID_BAD_TARGET << 16; |
854 | goto out; | |
855 | } | |
856 | ||
8f333991 | 857 | senselen = get_unaligned_be16(data); |
7996a778 MC |
858 | if (datalen < senselen) |
859 | goto invalid_datalen; | |
860 | ||
861 | memcpy(sc->sense_buffer, data + 2, | |
9b80cb4b | 862 | min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE)); |
1b2c7af8 MC |
863 | ISCSI_DBG_SESSION(session, "copied %d bytes of sense\n", |
864 | min_t(uint16_t, senselen, | |
865 | SCSI_SENSE_BUFFERSIZE)); | |
7996a778 MC |
866 | } |
867 | ||
c07d4444 BH |
868 | if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW | |
869 | ISCSI_FLAG_CMD_BIDI_OVERFLOW)) { | |
ae3d56d8 | 870 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; |
c07d4444 BH |
871 | } |
872 | ||
7207fea4 BH |
873 | if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW | |
874 | ISCSI_FLAG_CMD_OVERFLOW)) { | |
7996a778 MC |
875 | int res_count = be32_to_cpu(rhdr->residual_count); |
876 | ||
7207fea4 BH |
877 | if (res_count > 0 && |
878 | (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || | |
879 | res_count <= scsi_bufflen(sc))) | |
c07d4444 | 880 | /* write side for bidi or uni-io set_resid */ |
1c138991 | 881 | scsi_set_resid(sc, res_count); |
7996a778 MC |
882 | else |
883 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
c07d4444 | 884 | } |
7996a778 | 885 | out: |
3bbaaad9 | 886 | ISCSI_DBG_SESSION(session, "cmd rsp done [sc %p res %d itt 0x%x]\n", |
1b2c7af8 | 887 | sc, sc->result, task->itt); |
7996a778 | 888 | conn->scsirsp_pdus_cnt++; |
b3cd5050 | 889 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); |
7996a778 MC |
890 | } |
891 | ||
1d9edf02 MC |
892 | /** |
893 | * iscsi_data_in_rsp - SCSI Data-In Response processing | |
894 | * @conn: iscsi connection | |
895 | * @hdr: iscsi pdu | |
896 | * @task: scsi command task | |
a656183e LD |
897 | * |
898 | * iscsi_data_in_rsp sets up the scsi_cmnd fields based on the data received | |
899 | * then completes the command and task. called under back_lock | |
1d9edf02 MC |
900 | **/ |
901 | static void | |
902 | iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
903 | struct iscsi_task *task) | |
904 | { | |
905 | struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)hdr; | |
906 | struct scsi_cmnd *sc = task->sc; | |
907 | ||
908 | if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS)) | |
909 | return; | |
910 | ||
edbc9aa0 | 911 | iscsi_update_cmdsn(conn->session, (struct iscsi_nopin *)hdr); |
1d9edf02 MC |
912 | sc->result = (DID_OK << 16) | rhdr->cmd_status; |
913 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; | |
914 | if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW | | |
915 | ISCSI_FLAG_DATA_OVERFLOW)) { | |
916 | int res_count = be32_to_cpu(rhdr->residual_count); | |
917 | ||
918 | if (res_count > 0 && | |
919 | (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || | |
ae3d56d8 | 920 | res_count <= sc->sdb.length)) |
960bf87a | 921 | scsi_set_resid(sc, res_count); |
1d9edf02 MC |
922 | else |
923 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
924 | } | |
925 | ||
3bbaaad9 MC |
926 | ISCSI_DBG_SESSION(conn->session, "data in with status done " |
927 | "[sc %p res %d itt 0x%x]\n", | |
928 | sc, sc->result, task->itt); | |
1d9edf02 | 929 | conn->scsirsp_pdus_cnt++; |
b3cd5050 | 930 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); |
1d9edf02 MC |
931 | } |
932 | ||
7ea8b828 MC |
933 | static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr) |
934 | { | |
935 | struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr; | |
936 | ||
937 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
938 | conn->tmfrsp_pdus_cnt++; | |
939 | ||
843c0a8a | 940 | if (conn->tmf_state != TMF_QUEUED) |
7ea8b828 MC |
941 | return; |
942 | ||
943 | if (tmf->response == ISCSI_TMF_RSP_COMPLETE) | |
843c0a8a | 944 | conn->tmf_state = TMF_SUCCESS; |
7ea8b828 | 945 | else if (tmf->response == ISCSI_TMF_RSP_NO_TASK) |
843c0a8a | 946 | conn->tmf_state = TMF_NOT_FOUND; |
7ea8b828 | 947 | else |
843c0a8a | 948 | conn->tmf_state = TMF_FAILED; |
7ea8b828 MC |
949 | wake_up(&conn->ehwait); |
950 | } | |
951 | ||
52f5664a | 952 | static int iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr) |
f6d5180c MC |
953 | { |
954 | struct iscsi_nopout hdr; | |
9c19a7d0 | 955 | struct iscsi_task *task; |
f6d5180c | 956 | |
9c19a7d0 | 957 | if (!rhdr && conn->ping_task) |
52f5664a | 958 | return -EINVAL; |
f6d5180c MC |
959 | |
960 | memset(&hdr, 0, sizeof(struct iscsi_nopout)); | |
961 | hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE; | |
962 | hdr.flags = ISCSI_FLAG_CMD_FINAL; | |
963 | ||
964 | if (rhdr) { | |
55bdabdf | 965 | hdr.lun = rhdr->lun; |
f6d5180c MC |
966 | hdr.ttt = rhdr->ttt; |
967 | hdr.itt = RESERVED_ITT; | |
968 | } else | |
969 | hdr.ttt = RESERVED_ITT; | |
970 | ||
9c19a7d0 | 971 | task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0); |
52f5664a | 972 | if (!task) { |
322d739d | 973 | iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n"); |
52f5664a AN |
974 | return -EIO; |
975 | } else if (!rhdr) { | |
d3acf022 MC |
976 | /* only track our nops */ |
977 | conn->ping_task = task; | |
978 | conn->last_ping = jiffies; | |
979 | } | |
52f5664a AN |
980 | |
981 | return 0; | |
f6d5180c MC |
982 | } |
983 | ||
a656183e LD |
984 | /** |
985 | * iscsi_nop_out_rsp - SCSI NOP Response processing | |
986 | * @task: scsi command task | |
987 | * @nop: the nop structure | |
988 | * @data: where to put the data | |
989 | * @datalen: length of data | |
990 | * | |
991 | * iscsi_nop_out_rsp handles nop response from use or | |
992 | * from user space. called under back_lock | |
993 | **/ | |
8afa1439 MC |
994 | static int iscsi_nop_out_rsp(struct iscsi_task *task, |
995 | struct iscsi_nopin *nop, char *data, int datalen) | |
996 | { | |
997 | struct iscsi_conn *conn = task->conn; | |
998 | int rc = 0; | |
999 | ||
1000 | if (conn->ping_task != task) { | |
1001 | /* | |
1002 | * If this is not in response to one of our | |
1003 | * nops then it must be from userspace. | |
1004 | */ | |
1005 | if (iscsi_recv_pdu(conn->cls_conn, (struct iscsi_hdr *)nop, | |
1006 | data, datalen)) | |
1007 | rc = ISCSI_ERR_CONN_FAILED; | |
1008 | } else | |
1009 | mod_timer(&conn->transport_timer, jiffies + conn->recv_timeout); | |
1010 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); | |
1011 | return rc; | |
1012 | } | |
1013 | ||
62f38300 MC |
1014 | static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
1015 | char *data, int datalen) | |
1016 | { | |
1017 | struct iscsi_reject *reject = (struct iscsi_reject *)hdr; | |
1018 | struct iscsi_hdr rejected_pdu; | |
8afa1439 | 1019 | int opcode, rc = 0; |
62f38300 MC |
1020 | |
1021 | conn->exp_statsn = be32_to_cpu(reject->statsn) + 1; | |
1022 | ||
8afa1439 MC |
1023 | if (ntoh24(reject->dlength) > datalen || |
1024 | ntoh24(reject->dlength) < sizeof(struct iscsi_hdr)) { | |
1025 | iscsi_conn_printk(KERN_ERR, conn, "Cannot handle rejected " | |
1026 | "pdu. Invalid data length (pdu dlength " | |
1027 | "%u, datalen %d\n", ntoh24(reject->dlength), | |
1028 | datalen); | |
1029 | return ISCSI_ERR_PROTO; | |
1030 | } | |
1031 | memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr)); | |
1032 | opcode = rejected_pdu.opcode & ISCSI_OPCODE_MASK; | |
1033 | ||
1034 | switch (reject->reason) { | |
1035 | case ISCSI_REASON_DATA_DIGEST_ERROR: | |
1036 | iscsi_conn_printk(KERN_ERR, conn, | |
1037 | "pdu (op 0x%x itt 0x%x) rejected " | |
1038 | "due to DataDigest error.\n", | |
e5dbbe27 | 1039 | opcode, rejected_pdu.itt); |
8afa1439 MC |
1040 | break; |
1041 | case ISCSI_REASON_IMM_CMD_REJECT: | |
1042 | iscsi_conn_printk(KERN_ERR, conn, | |
1043 | "pdu (op 0x%x itt 0x%x) rejected. Too many " | |
1044 | "immediate commands.\n", | |
e5dbbe27 | 1045 | opcode, rejected_pdu.itt); |
8afa1439 MC |
1046 | /* |
1047 | * We only send one TMF at a time so if the target could not | |
1048 | * handle it, then it should get fixed (RFC mandates that | |
1049 | * a target can handle one immediate TMF per conn). | |
1050 | * | |
1051 | * For nops-outs, we could have sent more than one if | |
1052 | * the target is sending us lots of nop-ins | |
1053 | */ | |
1054 | if (opcode != ISCSI_OP_NOOP_OUT) | |
1055 | return 0; | |
62f38300 | 1056 | |
4dec6a8f | 1057 | if (rejected_pdu.itt == cpu_to_be32(ISCSI_RESERVED_TAG)) { |
8afa1439 MC |
1058 | /* |
1059 | * nop-out in response to target's nop-out rejected. | |
1060 | * Just resend. | |
1061 | */ | |
659743b0 SP |
1062 | /* In RX path we are under back lock */ |
1063 | spin_unlock(&conn->session->back_lock); | |
1064 | spin_lock(&conn->session->frwd_lock); | |
8afa1439 MC |
1065 | iscsi_send_nopout(conn, |
1066 | (struct iscsi_nopin*)&rejected_pdu); | |
659743b0 SP |
1067 | spin_unlock(&conn->session->frwd_lock); |
1068 | spin_lock(&conn->session->back_lock); | |
1069 | } else { | |
8afa1439 MC |
1070 | struct iscsi_task *task; |
1071 | /* | |
1072 | * Our nop as ping got dropped. We know the target | |
1073 | * and transport are ok so just clean up | |
1074 | */ | |
1075 | task = iscsi_itt_to_task(conn, rejected_pdu.itt); | |
1076 | if (!task) { | |
1077 | iscsi_conn_printk(KERN_ERR, conn, | |
1078 | "Invalid pdu reject. Could " | |
1079 | "not lookup rejected task.\n"); | |
1080 | rc = ISCSI_ERR_BAD_ITT; | |
1081 | } else | |
1082 | rc = iscsi_nop_out_rsp(task, | |
1083 | (struct iscsi_nopin*)&rejected_pdu, | |
1084 | NULL, 0); | |
62f38300 | 1085 | } |
8afa1439 MC |
1086 | break; |
1087 | default: | |
1088 | iscsi_conn_printk(KERN_ERR, conn, | |
1089 | "pdu (op 0x%x itt 0x%x) rejected. Reason " | |
e5dbbe27 VC |
1090 | "code 0x%x\n", rejected_pdu.opcode, |
1091 | rejected_pdu.itt, reject->reason); | |
8afa1439 | 1092 | break; |
62f38300 | 1093 | } |
8afa1439 | 1094 | return rc; |
62f38300 MC |
1095 | } |
1096 | ||
913e5bf4 MC |
1097 | /** |
1098 | * iscsi_itt_to_task - look up task by itt | |
1099 | * @conn: iscsi connection | |
1100 | * @itt: itt | |
1101 | * | |
1102 | * This should be used for mgmt tasks like login and nops, or if | |
1103 | * the LDD's itt space does not include the session age. | |
1104 | * | |
659743b0 | 1105 | * The session back_lock must be held. |
913e5bf4 | 1106 | */ |
8f9256ce | 1107 | struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *conn, itt_t itt) |
913e5bf4 MC |
1108 | { |
1109 | struct iscsi_session *session = conn->session; | |
262ef636 | 1110 | int i; |
913e5bf4 MC |
1111 | |
1112 | if (itt == RESERVED_ITT) | |
1113 | return NULL; | |
1114 | ||
262ef636 MC |
1115 | if (session->tt->parse_pdu_itt) |
1116 | session->tt->parse_pdu_itt(conn, itt, &i, NULL); | |
1117 | else | |
1118 | i = get_itt(itt); | |
913e5bf4 MC |
1119 | if (i >= session->cmds_max) |
1120 | return NULL; | |
1121 | ||
1122 | return session->cmds[i]; | |
1123 | } | |
8f9256ce | 1124 | EXPORT_SYMBOL_GPL(iscsi_itt_to_task); |
913e5bf4 | 1125 | |
7996a778 MC |
1126 | /** |
1127 | * __iscsi_complete_pdu - complete pdu | |
1128 | * @conn: iscsi conn | |
1129 | * @hdr: iscsi header | |
1130 | * @data: data buffer | |
1131 | * @datalen: len of data buffer | |
1132 | * | |
1133 | * Completes pdu processing by freeing any resources allocated at | |
659743b0 | 1134 | * queuecommand or send generic. session back_lock must be held and verify |
7996a778 MC |
1135 | * itt must have been called. |
1136 | */ | |
913e5bf4 MC |
1137 | int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
1138 | char *data, int datalen) | |
7996a778 MC |
1139 | { |
1140 | struct iscsi_session *session = conn->session; | |
1141 | int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0; | |
9c19a7d0 | 1142 | struct iscsi_task *task; |
7996a778 MC |
1143 | uint32_t itt; |
1144 | ||
f6d5180c | 1145 | conn->last_recv = jiffies; |
0af967f5 MC |
1146 | rc = iscsi_verify_itt(conn, hdr->itt); |
1147 | if (rc) | |
1148 | return rc; | |
1149 | ||
b4377356 AV |
1150 | if (hdr->itt != RESERVED_ITT) |
1151 | itt = get_itt(hdr->itt); | |
7996a778 | 1152 | else |
b4377356 | 1153 | itt = ~0U; |
7996a778 | 1154 | |
1b2c7af8 MC |
1155 | ISCSI_DBG_SESSION(session, "[op 0x%x cid %d itt 0x%x len %d]\n", |
1156 | opcode, conn->id, itt, datalen); | |
7996a778 | 1157 | |
3e5c28ad | 1158 | if (itt == ~0U) { |
77a23c21 | 1159 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); |
62f38300 | 1160 | |
7996a778 MC |
1161 | switch(opcode) { |
1162 | case ISCSI_OP_NOOP_IN: | |
40527afe | 1163 | if (datalen) { |
7996a778 | 1164 | rc = ISCSI_ERR_PROTO; |
40527afe MC |
1165 | break; |
1166 | } | |
1167 | ||
b4377356 | 1168 | if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG)) |
40527afe MC |
1169 | break; |
1170 | ||
659743b0 SP |
1171 | /* In RX path we are under back lock */ |
1172 | spin_unlock(&session->back_lock); | |
1173 | spin_lock(&session->frwd_lock); | |
f6d5180c | 1174 | iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr); |
659743b0 SP |
1175 | spin_unlock(&session->frwd_lock); |
1176 | spin_lock(&session->back_lock); | |
7996a778 MC |
1177 | break; |
1178 | case ISCSI_OP_REJECT: | |
62f38300 MC |
1179 | rc = iscsi_handle_reject(conn, hdr, data, datalen); |
1180 | break; | |
7996a778 | 1181 | case ISCSI_OP_ASYNC_EVENT: |
8d2860b3 | 1182 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; |
5831c737 MC |
1183 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) |
1184 | rc = ISCSI_ERR_CONN_FAILED; | |
7996a778 MC |
1185 | break; |
1186 | default: | |
1187 | rc = ISCSI_ERR_BAD_OPCODE; | |
1188 | break; | |
1189 | } | |
3e5c28ad MC |
1190 | goto out; |
1191 | } | |
1192 | ||
3e5c28ad MC |
1193 | switch(opcode) { |
1194 | case ISCSI_OP_SCSI_CMD_RSP: | |
913e5bf4 MC |
1195 | case ISCSI_OP_SCSI_DATA_IN: |
1196 | task = iscsi_itt_to_ctask(conn, hdr->itt); | |
1197 | if (!task) | |
1198 | return ISCSI_ERR_BAD_ITT; | |
d355e57d | 1199 | task->last_xfer = jiffies; |
913e5bf4 MC |
1200 | break; |
1201 | case ISCSI_OP_R2T: | |
1202 | /* | |
1203 | * LLD handles R2Ts if they need to. | |
1204 | */ | |
1205 | return 0; | |
1206 | case ISCSI_OP_LOGOUT_RSP: | |
1207 | case ISCSI_OP_LOGIN_RSP: | |
1208 | case ISCSI_OP_TEXT_RSP: | |
1209 | case ISCSI_OP_SCSI_TMFUNC_RSP: | |
1210 | case ISCSI_OP_NOOP_IN: | |
1211 | task = iscsi_itt_to_task(conn, hdr->itt); | |
1212 | if (!task) | |
1213 | return ISCSI_ERR_BAD_ITT; | |
1214 | break; | |
1215 | default: | |
1216 | return ISCSI_ERR_BAD_OPCODE; | |
1217 | } | |
1218 | ||
1219 | switch(opcode) { | |
1220 | case ISCSI_OP_SCSI_CMD_RSP: | |
9c19a7d0 | 1221 | iscsi_scsi_cmd_rsp(conn, hdr, task, data, datalen); |
3e5c28ad MC |
1222 | break; |
1223 | case ISCSI_OP_SCSI_DATA_IN: | |
1d9edf02 | 1224 | iscsi_data_in_rsp(conn, hdr, task); |
3e5c28ad | 1225 | break; |
3e5c28ad MC |
1226 | case ISCSI_OP_LOGOUT_RSP: |
1227 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
1228 | if (datalen) { | |
1229 | rc = ISCSI_ERR_PROTO; | |
1230 | break; | |
1231 | } | |
1232 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
1233 | goto recv_pdu; | |
1234 | case ISCSI_OP_LOGIN_RSP: | |
1235 | case ISCSI_OP_TEXT_RSP: | |
1236 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
1237 | /* | |
1238 | * login related PDU's exp_statsn is handled in | |
1239 | * userspace | |
1240 | */ | |
1241 | goto recv_pdu; | |
1242 | case ISCSI_OP_SCSI_TMFUNC_RSP: | |
1243 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
1244 | if (datalen) { | |
1245 | rc = ISCSI_ERR_PROTO; | |
1246 | break; | |
1247 | } | |
1248 | ||
1249 | iscsi_tmf_rsp(conn, hdr); | |
b3cd5050 | 1250 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); |
3e5c28ad MC |
1251 | break; |
1252 | case ISCSI_OP_NOOP_IN: | |
1253 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
1254 | if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) { | |
1255 | rc = ISCSI_ERR_PROTO; | |
1256 | break; | |
1257 | } | |
1258 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
1259 | ||
8afa1439 MC |
1260 | rc = iscsi_nop_out_rsp(task, (struct iscsi_nopin*)hdr, |
1261 | data, datalen); | |
3e5c28ad MC |
1262 | break; |
1263 | default: | |
1264 | rc = ISCSI_ERR_BAD_OPCODE; | |
1265 | break; | |
1266 | } | |
7996a778 | 1267 | |
3e5c28ad MC |
1268 | out: |
1269 | return rc; | |
1270 | recv_pdu: | |
1271 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) | |
1272 | rc = ISCSI_ERR_CONN_FAILED; | |
b3cd5050 | 1273 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); |
7996a778 MC |
1274 | return rc; |
1275 | } | |
913e5bf4 | 1276 | EXPORT_SYMBOL_GPL(__iscsi_complete_pdu); |
7996a778 MC |
1277 | |
1278 | int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
1279 | char *data, int datalen) | |
1280 | { | |
1281 | int rc; | |
1282 | ||
659743b0 | 1283 | spin_lock(&conn->session->back_lock); |
7996a778 | 1284 | rc = __iscsi_complete_pdu(conn, hdr, data, datalen); |
659743b0 | 1285 | spin_unlock(&conn->session->back_lock); |
7996a778 MC |
1286 | return rc; |
1287 | } | |
1288 | EXPORT_SYMBOL_GPL(iscsi_complete_pdu); | |
1289 | ||
0af967f5 | 1290 | int iscsi_verify_itt(struct iscsi_conn *conn, itt_t itt) |
7996a778 MC |
1291 | { |
1292 | struct iscsi_session *session = conn->session; | |
262ef636 | 1293 | int age = 0, i = 0; |
7996a778 | 1294 | |
0af967f5 MC |
1295 | if (itt == RESERVED_ITT) |
1296 | return 0; | |
7996a778 | 1297 | |
262ef636 MC |
1298 | if (session->tt->parse_pdu_itt) |
1299 | session->tt->parse_pdu_itt(conn, itt, &i, &age); | |
1300 | else { | |
1301 | i = get_itt(itt); | |
1302 | age = ((__force u32)itt >> ISCSI_AGE_SHIFT) & ISCSI_AGE_MASK; | |
1303 | } | |
1304 | ||
1305 | if (age != session->age) { | |
0af967f5 MC |
1306 | iscsi_conn_printk(KERN_ERR, conn, |
1307 | "received itt %x expected session age (%x)\n", | |
913e5bf4 | 1308 | (__force u32)itt, session->age); |
0af967f5 MC |
1309 | return ISCSI_ERR_BAD_ITT; |
1310 | } | |
7996a778 | 1311 | |
3e5c28ad MC |
1312 | if (i >= session->cmds_max) { |
1313 | iscsi_conn_printk(KERN_ERR, conn, | |
1314 | "received invalid itt index %u (max cmds " | |
1315 | "%u.\n", i, session->cmds_max); | |
1316 | return ISCSI_ERR_BAD_ITT; | |
7996a778 | 1317 | } |
7996a778 MC |
1318 | return 0; |
1319 | } | |
1320 | EXPORT_SYMBOL_GPL(iscsi_verify_itt); | |
1321 | ||
913e5bf4 MC |
1322 | /** |
1323 | * iscsi_itt_to_ctask - look up ctask by itt | |
1324 | * @conn: iscsi connection | |
1325 | * @itt: itt | |
1326 | * | |
1327 | * This should be used for cmd tasks. | |
1328 | * | |
659743b0 | 1329 | * The session back_lock must be held. |
913e5bf4 MC |
1330 | */ |
1331 | struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *conn, itt_t itt) | |
0af967f5 | 1332 | { |
9c19a7d0 | 1333 | struct iscsi_task *task; |
0af967f5 MC |
1334 | |
1335 | if (iscsi_verify_itt(conn, itt)) | |
1336 | return NULL; | |
1337 | ||
913e5bf4 MC |
1338 | task = iscsi_itt_to_task(conn, itt); |
1339 | if (!task || !task->sc) | |
0af967f5 MC |
1340 | return NULL; |
1341 | ||
913e5bf4 MC |
1342 | if (task->sc->SCp.phase != conn->session->age) { |
1343 | iscsi_session_printk(KERN_ERR, conn->session, | |
1344 | "task's session age %d, expected %d\n", | |
1345 | task->sc->SCp.phase, conn->session->age); | |
0af967f5 | 1346 | return NULL; |
913e5bf4 | 1347 | } |
0af967f5 | 1348 | |
9c19a7d0 | 1349 | return task; |
0af967f5 MC |
1350 | } |
1351 | EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask); | |
1352 | ||
40a06e75 | 1353 | void iscsi_session_failure(struct iscsi_session *session, |
e5bd7b54 MC |
1354 | enum iscsi_err err) |
1355 | { | |
e5bd7b54 MC |
1356 | struct iscsi_conn *conn; |
1357 | struct device *dev; | |
e5bd7b54 | 1358 | |
659743b0 | 1359 | spin_lock_bh(&session->frwd_lock); |
e5bd7b54 MC |
1360 | conn = session->leadconn; |
1361 | if (session->state == ISCSI_STATE_TERMINATE || !conn) { | |
659743b0 | 1362 | spin_unlock_bh(&session->frwd_lock); |
e5bd7b54 MC |
1363 | return; |
1364 | } | |
1365 | ||
1366 | dev = get_device(&conn->cls_conn->dev); | |
659743b0 | 1367 | spin_unlock_bh(&session->frwd_lock); |
e5bd7b54 MC |
1368 | if (!dev) |
1369 | return; | |
1370 | /* | |
1371 | * if the host is being removed bypass the connection | |
1372 | * recovery initialization because we are going to kill | |
1373 | * the session. | |
1374 | */ | |
1375 | if (err == ISCSI_ERR_INVALID_HOST) | |
1376 | iscsi_conn_error_event(conn->cls_conn, err); | |
1377 | else | |
1378 | iscsi_conn_failure(conn, err); | |
1379 | put_device(dev); | |
1380 | } | |
1381 | EXPORT_SYMBOL_GPL(iscsi_session_failure); | |
1382 | ||
7996a778 MC |
1383 | void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err) |
1384 | { | |
1385 | struct iscsi_session *session = conn->session; | |
7996a778 | 1386 | |
659743b0 | 1387 | spin_lock_bh(&session->frwd_lock); |
656cffc9 | 1388 | if (session->state == ISCSI_STATE_FAILED) { |
659743b0 | 1389 | spin_unlock_bh(&session->frwd_lock); |
656cffc9 MC |
1390 | return; |
1391 | } | |
1392 | ||
67a61114 | 1393 | if (conn->stop_stage == 0) |
7996a778 | 1394 | session->state = ISCSI_STATE_FAILED; |
659743b0 | 1395 | spin_unlock_bh(&session->frwd_lock); |
e5bd7b54 | 1396 | |
7996a778 MC |
1397 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); |
1398 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
e5bd7b54 | 1399 | iscsi_conn_error_event(conn->cls_conn, err); |
7996a778 MC |
1400 | } |
1401 | EXPORT_SYMBOL_GPL(iscsi_conn_failure); | |
1402 | ||
77a23c21 MC |
1403 | static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn) |
1404 | { | |
1405 | struct iscsi_session *session = conn->session; | |
1406 | ||
1407 | /* | |
1408 | * Check for iSCSI window and take care of CmdSN wrap-around | |
1409 | */ | |
e0726407 | 1410 | if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) { |
1b2c7af8 MC |
1411 | ISCSI_DBG_SESSION(session, "iSCSI CmdSN closed. ExpCmdSn " |
1412 | "%u MaxCmdSN %u CmdSN %u/%u\n", | |
1413 | session->exp_cmdsn, session->max_cmdsn, | |
1414 | session->cmdsn, session->queued_cmdsn); | |
77a23c21 MC |
1415 | return -ENOSPC; |
1416 | } | |
1417 | return 0; | |
1418 | } | |
1419 | ||
9c19a7d0 | 1420 | static int iscsi_xmit_task(struct iscsi_conn *conn) |
77a23c21 | 1421 | { |
9c19a7d0 | 1422 | struct iscsi_task *task = conn->task; |
843c0a8a | 1423 | int rc; |
77a23c21 | 1424 | |
70b31c15 MC |
1425 | if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) |
1426 | return -ENODATA; | |
1427 | ||
79edd00d AS |
1428 | spin_lock_bh(&conn->session->back_lock); |
1429 | if (conn->task == NULL) { | |
1430 | spin_unlock_bh(&conn->session->back_lock); | |
1431 | return -ENODATA; | |
1432 | } | |
9c19a7d0 | 1433 | __iscsi_get_task(task); |
79edd00d | 1434 | spin_unlock_bh(&conn->session->back_lock); |
659743b0 | 1435 | spin_unlock_bh(&conn->session->frwd_lock); |
9c19a7d0 | 1436 | rc = conn->session->tt->xmit_task(task); |
659743b0 | 1437 | spin_lock_bh(&conn->session->frwd_lock); |
d355e57d | 1438 | if (!rc) { |
9c19a7d0 | 1439 | /* done with this task */ |
d355e57d | 1440 | task->last_xfer = jiffies; |
9c19a7d0 | 1441 | conn->task = NULL; |
d355e57d | 1442 | } |
659743b0 | 1443 | /* regular RX path uses back_lock */ |
72b97402 | 1444 | spin_lock(&conn->session->back_lock); |
d355e57d | 1445 | __iscsi_put_task(task); |
72b97402 | 1446 | spin_unlock(&conn->session->back_lock); |
77a23c21 MC |
1447 | return rc; |
1448 | } | |
1449 | ||
843c0a8a | 1450 | /** |
9c19a7d0 MC |
1451 | * iscsi_requeue_task - requeue task to run from session workqueue |
1452 | * @task: task to requeue | |
843c0a8a | 1453 | * |
9c19a7d0 | 1454 | * LLDs that need to run a task from the session workqueue should call |
659743b0 | 1455 | * this. The session frwd_lock must be held. This should only be called |
052d0144 | 1456 | * by software drivers. |
843c0a8a | 1457 | */ |
9c19a7d0 | 1458 | void iscsi_requeue_task(struct iscsi_task *task) |
843c0a8a | 1459 | { |
9c19a7d0 | 1460 | struct iscsi_conn *conn = task->conn; |
843c0a8a | 1461 | |
3bbaaad9 MC |
1462 | /* |
1463 | * this may be on the requeue list already if the xmit_task callout | |
1464 | * is handling the r2ts while we are adding new ones | |
1465 | */ | |
6f8830f5 | 1466 | spin_lock_bh(&conn->taskqueuelock); |
3bbaaad9 MC |
1467 | if (list_empty(&task->running)) |
1468 | list_add_tail(&task->running, &conn->requeue); | |
6f8830f5 | 1469 | spin_unlock_bh(&conn->taskqueuelock); |
32ae763e | 1470 | iscsi_conn_queue_work(conn); |
843c0a8a | 1471 | } |
9c19a7d0 | 1472 | EXPORT_SYMBOL_GPL(iscsi_requeue_task); |
843c0a8a | 1473 | |
7996a778 MC |
1474 | /** |
1475 | * iscsi_data_xmit - xmit any command into the scheduled connection | |
1476 | * @conn: iscsi connection | |
1477 | * | |
1478 | * Notes: | |
1479 | * The function can return -EAGAIN in which case the caller must | |
1480 | * re-schedule it again later or recover. '0' return code means | |
1481 | * successful xmit. | |
1482 | **/ | |
1483 | static int iscsi_data_xmit(struct iscsi_conn *conn) | |
1484 | { | |
5d12c05e | 1485 | struct iscsi_task *task; |
3219e529 | 1486 | int rc = 0; |
7996a778 | 1487 | |
659743b0 | 1488 | spin_lock_bh(&conn->session->frwd_lock); |
70b31c15 | 1489 | if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) { |
1b2c7af8 | 1490 | ISCSI_DBG_SESSION(conn->session, "Tx suspended!\n"); |
659743b0 | 1491 | spin_unlock_bh(&conn->session->frwd_lock); |
3219e529 | 1492 | return -ENODATA; |
7996a778 | 1493 | } |
7996a778 | 1494 | |
9c19a7d0 MC |
1495 | if (conn->task) { |
1496 | rc = iscsi_xmit_task(conn); | |
3219e529 | 1497 | if (rc) |
70b31c15 | 1498 | goto done; |
7996a778 MC |
1499 | } |
1500 | ||
77a23c21 MC |
1501 | /* |
1502 | * process mgmt pdus like nops before commands since we should | |
1503 | * only have one nop-out as a ping from us and targets should not | |
1504 | * overflow us with nop-ins | |
1505 | */ | |
6f8830f5 | 1506 | spin_lock_bh(&conn->taskqueuelock); |
77a23c21 | 1507 | check_mgmt: |
843c0a8a | 1508 | while (!list_empty(&conn->mgmtqueue)) { |
9c19a7d0 MC |
1509 | conn->task = list_entry(conn->mgmtqueue.next, |
1510 | struct iscsi_task, running); | |
3bbaaad9 | 1511 | list_del_init(&conn->task->running); |
6f8830f5 | 1512 | spin_unlock_bh(&conn->taskqueuelock); |
9c19a7d0 | 1513 | if (iscsi_prep_mgmt_task(conn, conn->task)) { |
659743b0 SP |
1514 | /* regular RX path uses back_lock */ |
1515 | spin_lock_bh(&conn->session->back_lock); | |
9c19a7d0 | 1516 | __iscsi_put_task(conn->task); |
659743b0 | 1517 | spin_unlock_bh(&conn->session->back_lock); |
9c19a7d0 | 1518 | conn->task = NULL; |
6f8830f5 | 1519 | spin_lock_bh(&conn->taskqueuelock); |
b3a7ea8d MC |
1520 | continue; |
1521 | } | |
9c19a7d0 | 1522 | rc = iscsi_xmit_task(conn); |
77a23c21 | 1523 | if (rc) |
70b31c15 | 1524 | goto done; |
6f8830f5 | 1525 | spin_lock_bh(&conn->taskqueuelock); |
7996a778 MC |
1526 | } |
1527 | ||
843c0a8a | 1528 | /* process pending command queue */ |
3bbaaad9 | 1529 | while (!list_empty(&conn->cmdqueue)) { |
5d12c05e MC |
1530 | conn->task = list_entry(conn->cmdqueue.next, struct iscsi_task, |
1531 | running); | |
3bbaaad9 | 1532 | list_del_init(&conn->task->running); |
6f8830f5 | 1533 | spin_unlock_bh(&conn->taskqueuelock); |
b3a7ea8d | 1534 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) { |
b3cd5050 | 1535 | fail_scsi_task(conn->task, DID_IMM_RETRY); |
6f8830f5 | 1536 | spin_lock_bh(&conn->taskqueuelock); |
b3a7ea8d MC |
1537 | continue; |
1538 | } | |
577577da MC |
1539 | rc = iscsi_prep_scsi_cmd_pdu(conn->task); |
1540 | if (rc) { | |
5d12c05e | 1541 | if (rc == -ENOMEM || rc == -EACCES) { |
6f8830f5 | 1542 | spin_lock_bh(&conn->taskqueuelock); |
3bbaaad9 MC |
1543 | list_add_tail(&conn->task->running, |
1544 | &conn->cmdqueue); | |
577577da | 1545 | conn->task = NULL; |
6f8830f5 | 1546 | spin_unlock_bh(&conn->taskqueuelock); |
70b31c15 | 1547 | goto done; |
577577da | 1548 | } else |
b3cd5050 | 1549 | fail_scsi_task(conn->task, DID_ABORT); |
6f8830f5 | 1550 | spin_lock_bh(&conn->taskqueuelock); |
004d6530 BH |
1551 | continue; |
1552 | } | |
9c19a7d0 | 1553 | rc = iscsi_xmit_task(conn); |
77a23c21 | 1554 | if (rc) |
70b31c15 | 1555 | goto done; |
77a23c21 | 1556 | /* |
9c19a7d0 | 1557 | * we could continuously get new task requests so |
77a23c21 MC |
1558 | * we need to check the mgmt queue for nops that need to |
1559 | * be sent to aviod starvation | |
1560 | */ | |
6f8830f5 | 1561 | spin_lock_bh(&conn->taskqueuelock); |
843c0a8a MC |
1562 | if (!list_empty(&conn->mgmtqueue)) |
1563 | goto check_mgmt; | |
1564 | } | |
1565 | ||
1566 | while (!list_empty(&conn->requeue)) { | |
b3a7ea8d MC |
1567 | /* |
1568 | * we always do fastlogout - conn stop code will clean up. | |
1569 | */ | |
1570 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) | |
1571 | break; | |
1572 | ||
5d12c05e MC |
1573 | task = list_entry(conn->requeue.next, struct iscsi_task, |
1574 | running); | |
1575 | if (iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_DATA_OUT)) | |
1576 | break; | |
1577 | ||
1578 | conn->task = task; | |
3bbaaad9 | 1579 | list_del_init(&conn->task->running); |
9c19a7d0 | 1580 | conn->task->state = ISCSI_TASK_RUNNING; |
6f8830f5 | 1581 | spin_unlock_bh(&conn->taskqueuelock); |
9c19a7d0 | 1582 | rc = iscsi_xmit_task(conn); |
843c0a8a | 1583 | if (rc) |
70b31c15 | 1584 | goto done; |
6f8830f5 | 1585 | spin_lock_bh(&conn->taskqueuelock); |
843c0a8a | 1586 | if (!list_empty(&conn->mgmtqueue)) |
77a23c21 | 1587 | goto check_mgmt; |
7996a778 | 1588 | } |
6f8830f5 | 1589 | spin_unlock_bh(&conn->taskqueuelock); |
659743b0 | 1590 | spin_unlock_bh(&conn->session->frwd_lock); |
3219e529 | 1591 | return -ENODATA; |
7996a778 | 1592 | |
70b31c15 | 1593 | done: |
659743b0 | 1594 | spin_unlock_bh(&conn->session->frwd_lock); |
3219e529 | 1595 | return rc; |
7996a778 MC |
1596 | } |
1597 | ||
c4028958 | 1598 | static void iscsi_xmitworker(struct work_struct *work) |
7996a778 | 1599 | { |
c4028958 DH |
1600 | struct iscsi_conn *conn = |
1601 | container_of(work, struct iscsi_conn, xmitwork); | |
3219e529 | 1602 | int rc; |
7996a778 MC |
1603 | /* |
1604 | * serialize Xmit worker on a per-connection basis. | |
1605 | */ | |
3219e529 MC |
1606 | do { |
1607 | rc = iscsi_data_xmit(conn); | |
1608 | } while (rc >= 0 || rc == -EAGAIN); | |
7996a778 MC |
1609 | } |
1610 | ||
577577da MC |
1611 | static inline struct iscsi_task *iscsi_alloc_task(struct iscsi_conn *conn, |
1612 | struct scsi_cmnd *sc) | |
1613 | { | |
1614 | struct iscsi_task *task; | |
1615 | ||
7acd72eb | 1616 | if (!kfifo_out(&conn->session->cmdpool.queue, |
577577da MC |
1617 | (void *) &task, sizeof(void *))) |
1618 | return NULL; | |
1619 | ||
1620 | sc->SCp.phase = conn->session->age; | |
1621 | sc->SCp.ptr = (char *) task; | |
1622 | ||
6dc618cd | 1623 | refcount_set(&task->refcount, 1); |
577577da MC |
1624 | task->state = ISCSI_TASK_PENDING; |
1625 | task->conn = conn; | |
1626 | task->sc = sc; | |
d355e57d MC |
1627 | task->have_checked_conn = false; |
1628 | task->last_timeout = jiffies; | |
1629 | task->last_xfer = jiffies; | |
55e51eda | 1630 | task->protected = false; |
577577da MC |
1631 | INIT_LIST_HEAD(&task->running); |
1632 | return task; | |
1633 | } | |
1634 | ||
7996a778 MC |
1635 | enum { |
1636 | FAILURE_BAD_HOST = 1, | |
1637 | FAILURE_SESSION_FAILED, | |
1638 | FAILURE_SESSION_FREED, | |
1639 | FAILURE_WINDOW_CLOSED, | |
60ecebf5 | 1640 | FAILURE_OOM, |
7996a778 | 1641 | FAILURE_SESSION_TERMINATE, |
656cffc9 | 1642 | FAILURE_SESSION_IN_RECOVERY, |
7996a778 | 1643 | FAILURE_SESSION_RECOVERY_TIMEOUT, |
b3a7ea8d | 1644 | FAILURE_SESSION_LOGGING_OUT, |
6eabafbe | 1645 | FAILURE_SESSION_NOT_READY, |
7996a778 MC |
1646 | }; |
1647 | ||
f41d4721 | 1648 | int iscsi_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc) |
7996a778 | 1649 | { |
75613521 | 1650 | struct iscsi_cls_session *cls_session; |
1336aed1 | 1651 | struct iscsi_host *ihost; |
7996a778 MC |
1652 | int reason = 0; |
1653 | struct iscsi_session *session; | |
1654 | struct iscsi_conn *conn; | |
9c19a7d0 | 1655 | struct iscsi_task *task = NULL; |
7996a778 | 1656 | |
7996a778 | 1657 | sc->result = 0; |
f47f2cf5 | 1658 | sc->SCp.ptr = NULL; |
7996a778 | 1659 | |
1336aed1 | 1660 | ihost = shost_priv(host); |
7996a778 | 1661 | |
75613521 MC |
1662 | cls_session = starget_to_session(scsi_target(sc->device)); |
1663 | session = cls_session->dd_data; | |
659743b0 | 1664 | spin_lock_bh(&session->frwd_lock); |
7996a778 | 1665 | |
75613521 | 1666 | reason = iscsi_session_chkready(cls_session); |
6eabafbe MC |
1667 | if (reason) { |
1668 | sc->result = reason; | |
1669 | goto fault; | |
1670 | } | |
1671 | ||
301e0f7e | 1672 | if (session->state != ISCSI_STATE_LOGGED_IN) { |
656cffc9 MC |
1673 | /* |
1674 | * to handle the race between when we set the recovery state | |
1675 | * and block the session we requeue here (commands could | |
1676 | * be entering our queuecommand while a block is starting | |
1677 | * up because the block code is not locked) | |
1678 | */ | |
9000bcd6 | 1679 | switch (session->state) { |
301e0f7e | 1680 | case ISCSI_STATE_FAILED: |
d7549412 RDT |
1681 | /* |
1682 | * cmds should fail during shutdown, if the session | |
1683 | * state is bad, allowing completion to happen | |
1684 | */ | |
1685 | if (unlikely(system_state != SYSTEM_RUNNING)) { | |
1686 | reason = FAILURE_SESSION_FAILED; | |
1687 | sc->result = DID_NO_CONNECT << 16; | |
1688 | break; | |
1689 | } | |
807cf197 | 1690 | /* fall through */ |
9000bcd6 | 1691 | case ISCSI_STATE_IN_RECOVERY: |
656cffc9 | 1692 | reason = FAILURE_SESSION_IN_RECOVERY; |
301e0f7e MC |
1693 | sc->result = DID_IMM_RETRY << 16; |
1694 | break; | |
9000bcd6 MC |
1695 | case ISCSI_STATE_LOGGING_OUT: |
1696 | reason = FAILURE_SESSION_LOGGING_OUT; | |
301e0f7e MC |
1697 | sc->result = DID_IMM_RETRY << 16; |
1698 | break; | |
b3a7ea8d | 1699 | case ISCSI_STATE_RECOVERY_FAILED: |
656cffc9 | 1700 | reason = FAILURE_SESSION_RECOVERY_TIMEOUT; |
56d7fcfa | 1701 | sc->result = DID_TRANSPORT_FAILFAST << 16; |
b3a7ea8d MC |
1702 | break; |
1703 | case ISCSI_STATE_TERMINATE: | |
656cffc9 | 1704 | reason = FAILURE_SESSION_TERMINATE; |
6eabafbe | 1705 | sc->result = DID_NO_CONNECT << 16; |
b3a7ea8d | 1706 | break; |
b3a7ea8d | 1707 | default: |
656cffc9 | 1708 | reason = FAILURE_SESSION_FREED; |
6eabafbe | 1709 | sc->result = DID_NO_CONNECT << 16; |
b3a7ea8d | 1710 | } |
7996a778 MC |
1711 | goto fault; |
1712 | } | |
1713 | ||
7996a778 | 1714 | conn = session->leadconn; |
98644047 MC |
1715 | if (!conn) { |
1716 | reason = FAILURE_SESSION_FREED; | |
6eabafbe | 1717 | sc->result = DID_NO_CONNECT << 16; |
98644047 MC |
1718 | goto fault; |
1719 | } | |
7996a778 | 1720 | |
661134ad MC |
1721 | if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) { |
1722 | reason = FAILURE_SESSION_IN_RECOVERY; | |
eef9ffdf | 1723 | sc->result = DID_REQUEUE << 16; |
661134ad MC |
1724 | goto fault; |
1725 | } | |
1726 | ||
77a23c21 MC |
1727 | if (iscsi_check_cmdsn_window_closed(conn)) { |
1728 | reason = FAILURE_WINDOW_CLOSED; | |
1729 | goto reject; | |
1730 | } | |
1731 | ||
577577da MC |
1732 | task = iscsi_alloc_task(conn, sc); |
1733 | if (!task) { | |
60ecebf5 MC |
1734 | reason = FAILURE_OOM; |
1735 | goto reject; | |
1736 | } | |
7996a778 | 1737 | |
1336aed1 | 1738 | if (!ihost->workq) { |
577577da MC |
1739 | reason = iscsi_prep_scsi_cmd_pdu(task); |
1740 | if (reason) { | |
5d12c05e | 1741 | if (reason == -ENOMEM || reason == -EACCES) { |
577577da MC |
1742 | reason = FAILURE_OOM; |
1743 | goto prepd_reject; | |
1744 | } else { | |
1745 | sc->result = DID_ABORT << 16; | |
1746 | goto prepd_fault; | |
1747 | } | |
052d0144 | 1748 | } |
9c19a7d0 | 1749 | if (session->tt->xmit_task(task)) { |
d3305f34 | 1750 | session->cmdsn--; |
052d0144 | 1751 | reason = FAILURE_SESSION_NOT_READY; |
577577da | 1752 | goto prepd_reject; |
052d0144 | 1753 | } |
3bbaaad9 | 1754 | } else { |
6f8830f5 | 1755 | spin_lock_bh(&conn->taskqueuelock); |
3bbaaad9 | 1756 | list_add_tail(&task->running, &conn->cmdqueue); |
6f8830f5 | 1757 | spin_unlock_bh(&conn->taskqueuelock); |
32ae763e | 1758 | iscsi_conn_queue_work(conn); |
3bbaaad9 | 1759 | } |
052d0144 MC |
1760 | |
1761 | session->queued_cmdsn++; | |
659743b0 | 1762 | spin_unlock_bh(&session->frwd_lock); |
7996a778 MC |
1763 | return 0; |
1764 | ||
577577da | 1765 | prepd_reject: |
a656183e | 1766 | spin_lock_bh(&session->back_lock); |
f41d4721 | 1767 | iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ); |
a656183e | 1768 | spin_unlock_bh(&session->back_lock); |
7996a778 | 1769 | reject: |
659743b0 | 1770 | spin_unlock_bh(&session->frwd_lock); |
1b2c7af8 MC |
1771 | ISCSI_DBG_SESSION(session, "cmd 0x%x rejected (%d)\n", |
1772 | sc->cmnd[0], reason); | |
d6d13ee1 | 1773 | return SCSI_MLQUEUE_TARGET_BUSY; |
7996a778 | 1774 | |
577577da | 1775 | prepd_fault: |
a656183e | 1776 | spin_lock_bh(&session->back_lock); |
f41d4721 | 1777 | iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ); |
a656183e | 1778 | spin_unlock_bh(&session->back_lock); |
7996a778 | 1779 | fault: |
659743b0 | 1780 | spin_unlock_bh(&session->frwd_lock); |
1b2c7af8 MC |
1781 | ISCSI_DBG_SESSION(session, "iscsi: cmd 0x%x is not queued (%d)\n", |
1782 | sc->cmnd[0], reason); | |
ae3d56d8 | 1783 | scsi_set_resid(sc, scsi_bufflen(sc)); |
f41d4721 | 1784 | sc->scsi_done(sc); |
7996a778 MC |
1785 | return 0; |
1786 | } | |
1787 | EXPORT_SYMBOL_GPL(iscsi_queuecommand); | |
1788 | ||
6b5d6c44 MC |
1789 | int iscsi_target_alloc(struct scsi_target *starget) |
1790 | { | |
1791 | struct iscsi_cls_session *cls_session = starget_to_session(starget); | |
1792 | struct iscsi_session *session = cls_session->dd_data; | |
1793 | ||
1794 | starget->can_queue = session->scsi_cmds_max; | |
1795 | return 0; | |
1796 | } | |
1797 | EXPORT_SYMBOL_GPL(iscsi_target_alloc); | |
1798 | ||
2c4b9637 | 1799 | static void iscsi_tmf_timedout(struct timer_list *t) |
7996a778 | 1800 | { |
2c4b9637 | 1801 | struct iscsi_conn *conn = from_timer(conn, t, tmf_timer); |
7996a778 MC |
1802 | struct iscsi_session *session = conn->session; |
1803 | ||
659743b0 | 1804 | spin_lock(&session->frwd_lock); |
843c0a8a MC |
1805 | if (conn->tmf_state == TMF_QUEUED) { |
1806 | conn->tmf_state = TMF_TIMEDOUT; | |
bd2199d4 | 1807 | ISCSI_DBG_EH(session, "tmf timedout\n"); |
7996a778 MC |
1808 | /* unblock eh_abort() */ |
1809 | wake_up(&conn->ehwait); | |
1810 | } | |
659743b0 | 1811 | spin_unlock(&session->frwd_lock); |
7996a778 MC |
1812 | } |
1813 | ||
9c19a7d0 | 1814 | static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn, |
f6d5180c MC |
1815 | struct iscsi_tm *hdr, int age, |
1816 | int timeout) | |
1360c58a | 1817 | __must_hold(&session->frwd_lock) |
7996a778 | 1818 | { |
7996a778 | 1819 | struct iscsi_session *session = conn->session; |
9c19a7d0 | 1820 | struct iscsi_task *task; |
7996a778 | 1821 | |
9c19a7d0 | 1822 | task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr, |
843c0a8a | 1823 | NULL, 0); |
9c19a7d0 | 1824 | if (!task) { |
659743b0 | 1825 | spin_unlock_bh(&session->frwd_lock); |
df4da5cd | 1826 | iscsi_conn_printk(KERN_ERR, conn, "Could not send TMF.\n"); |
7996a778 | 1827 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
659743b0 | 1828 | spin_lock_bh(&session->frwd_lock); |
77a23c21 | 1829 | return -EPERM; |
7996a778 | 1830 | } |
843c0a8a | 1831 | conn->tmfcmd_pdus_cnt++; |
f6d5180c | 1832 | conn->tmf_timer.expires = timeout * HZ + jiffies; |
843c0a8a | 1833 | add_timer(&conn->tmf_timer); |
bd2199d4 | 1834 | ISCSI_DBG_EH(session, "tmf set timeout\n"); |
7996a778 | 1835 | |
659743b0 | 1836 | spin_unlock_bh(&session->frwd_lock); |
6724add1 | 1837 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1838 | |
1839 | /* | |
1840 | * block eh thread until: | |
1841 | * | |
843c0a8a MC |
1842 | * 1) tmf response |
1843 | * 2) tmf timeout | |
7996a778 MC |
1844 | * 3) session is terminated or restarted or userspace has |
1845 | * given up on recovery | |
1846 | */ | |
843c0a8a | 1847 | wait_event_interruptible(conn->ehwait, age != session->age || |
7996a778 | 1848 | session->state != ISCSI_STATE_LOGGED_IN || |
843c0a8a | 1849 | conn->tmf_state != TMF_QUEUED); |
7996a778 MC |
1850 | if (signal_pending(current)) |
1851 | flush_signals(current); | |
843c0a8a MC |
1852 | del_timer_sync(&conn->tmf_timer); |
1853 | ||
6724add1 | 1854 | mutex_lock(&session->eh_mutex); |
659743b0 | 1855 | spin_lock_bh(&session->frwd_lock); |
9c19a7d0 | 1856 | /* if the session drops it will clean up the task */ |
843c0a8a MC |
1857 | if (age != session->age || |
1858 | session->state != ISCSI_STATE_LOGGED_IN) | |
1859 | return -ENOTCONN; | |
7996a778 MC |
1860 | return 0; |
1861 | } | |
1862 | ||
843c0a8a MC |
1863 | /* |
1864 | * Fail commands. session lock held and recv side suspended and xmit | |
1865 | * thread flushed | |
1866 | */ | |
9cb78c16 | 1867 | static void fail_scsi_tasks(struct iscsi_conn *conn, u64 lun, int error) |
843c0a8a | 1868 | { |
3bbaaad9 MC |
1869 | struct iscsi_task *task; |
1870 | int i; | |
843c0a8a | 1871 | |
3bbaaad9 MC |
1872 | for (i = 0; i < conn->session->cmds_max; i++) { |
1873 | task = conn->session->cmds[i]; | |
1874 | if (!task->sc || task->state == ISCSI_TASK_FREE) | |
1875 | continue; | |
843c0a8a | 1876 | |
3bbaaad9 MC |
1877 | if (lun != -1 && lun != task->sc->device->lun) |
1878 | continue; | |
843c0a8a | 1879 | |
3bbaaad9 MC |
1880 | ISCSI_DBG_SESSION(conn->session, |
1881 | "failing sc %p itt 0x%x state %d\n", | |
1882 | task->sc, task->itt, task->state); | |
b3cd5050 | 1883 | fail_scsi_task(task, error); |
843c0a8a MC |
1884 | } |
1885 | } | |
1886 | ||
661134ad MC |
1887 | /** |
1888 | * iscsi_suspend_queue - suspend iscsi_queuecommand | |
1889 | * @conn: iscsi conn to stop queueing IO on | |
1890 | * | |
659743b0 | 1891 | * This grabs the session frwd_lock to make sure no one is in |
661134ad MC |
1892 | * xmit_task/queuecommand, and then sets suspend to prevent |
1893 | * new commands from being queued. This only needs to be called | |
1894 | * by offload drivers that need to sync a path like ep disconnect | |
1895 | * with the iscsi_queuecommand/xmit_task. To start IO again libiscsi | |
1896 | * will call iscsi_start_tx and iscsi_unblock_session when in FFP. | |
1897 | */ | |
1898 | void iscsi_suspend_queue(struct iscsi_conn *conn) | |
1899 | { | |
659743b0 | 1900 | spin_lock_bh(&conn->session->frwd_lock); |
661134ad | 1901 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); |
659743b0 | 1902 | spin_unlock_bh(&conn->session->frwd_lock); |
661134ad MC |
1903 | } |
1904 | EXPORT_SYMBOL_GPL(iscsi_suspend_queue); | |
1905 | ||
1906 | /** | |
1907 | * iscsi_suspend_tx - suspend iscsi_data_xmit | |
1908 | * @conn: iscsi conn tp stop processing IO on. | |
1909 | * | |
1910 | * This function sets the suspend bit to prevent iscsi_data_xmit | |
1911 | * from sending new IO, and if work is queued on the xmit thread | |
1912 | * it will wait for it to be completed. | |
1913 | */ | |
b40977d9 | 1914 | void iscsi_suspend_tx(struct iscsi_conn *conn) |
6724add1 | 1915 | { |
32ae763e MC |
1916 | struct Scsi_Host *shost = conn->session->host; |
1917 | struct iscsi_host *ihost = shost_priv(shost); | |
1918 | ||
6724add1 | 1919 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); |
1336aed1 | 1920 | if (ihost->workq) |
32ae763e | 1921 | flush_workqueue(ihost->workq); |
6724add1 | 1922 | } |
b40977d9 | 1923 | EXPORT_SYMBOL_GPL(iscsi_suspend_tx); |
6724add1 MC |
1924 | |
1925 | static void iscsi_start_tx(struct iscsi_conn *conn) | |
1926 | { | |
1927 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
1336aed1 | 1928 | iscsi_conn_queue_work(conn); |
6724add1 MC |
1929 | } |
1930 | ||
4c48a829 MC |
1931 | /* |
1932 | * We want to make sure a ping is in flight. It has timed out. | |
1933 | * And we are not busy processing a pdu that is making | |
1934 | * progress but got started before the ping and is taking a while | |
1935 | * to complete so the ping is just stuck behind it in a queue. | |
1936 | */ | |
1937 | static int iscsi_has_ping_timed_out(struct iscsi_conn *conn) | |
1938 | { | |
1939 | if (conn->ping_task && | |
1940 | time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) + | |
1941 | (conn->ping_timeout * HZ), jiffies)) | |
1942 | return 1; | |
1943 | else | |
1944 | return 0; | |
1945 | } | |
1946 | ||
b6a05c82 | 1947 | enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *sc) |
f6d5180c | 1948 | { |
6600593c | 1949 | enum blk_eh_timer_return rc = BLK_EH_DONE; |
92ed4d69 | 1950 | struct iscsi_task *task = NULL, *running_task; |
f6d5180c MC |
1951 | struct iscsi_cls_session *cls_session; |
1952 | struct iscsi_session *session; | |
1953 | struct iscsi_conn *conn; | |
92ed4d69 | 1954 | int i; |
f6d5180c | 1955 | |
d355e57d | 1956 | cls_session = starget_to_session(scsi_target(sc->device)); |
75613521 | 1957 | session = cls_session->dd_data; |
f6d5180c | 1958 | |
bd2199d4 | 1959 | ISCSI_DBG_EH(session, "scsi cmd %p timedout\n", sc); |
f6d5180c | 1960 | |
659743b0 | 1961 | spin_lock(&session->frwd_lock); |
e3d338a5 MC |
1962 | task = (struct iscsi_task *)sc->SCp.ptr; |
1963 | if (!task) { | |
1964 | /* | |
1965 | * Raced with completion. Blk layer has taken ownership | |
1966 | * so let timeout code complete it now. | |
1967 | */ | |
adb2b769 | 1968 | rc = BLK_EH_DONE; |
e3d338a5 MC |
1969 | goto done; |
1970 | } | |
1971 | ||
f6d5180c | 1972 | if (session->state != ISCSI_STATE_LOGGED_IN) { |
d7549412 RDT |
1973 | /* |
1974 | * During shutdown, if session is prematurely disconnected, | |
1975 | * recovery won't happen and there will be hung cmds. Not | |
1976 | * handling cmds would trigger EH, also bad in this case. | |
1977 | * Instead, handle cmd, allow completion to happen and let | |
1978 | * upper layer to deal with the result. | |
1979 | */ | |
1980 | if (unlikely(system_state != SYSTEM_RUNNING)) { | |
1981 | sc->result = DID_NO_CONNECT << 16; | |
1982 | ISCSI_DBG_EH(session, "sc on shutdown, handled\n"); | |
adb2b769 | 1983 | rc = BLK_EH_DONE; |
d7549412 RDT |
1984 | goto done; |
1985 | } | |
f6d5180c MC |
1986 | /* |
1987 | * We are probably in the middle of iscsi recovery so let | |
1988 | * that complete and handle the error. | |
1989 | */ | |
242f9dcb | 1990 | rc = BLK_EH_RESET_TIMER; |
f6d5180c MC |
1991 | goto done; |
1992 | } | |
1993 | ||
1994 | conn = session->leadconn; | |
1995 | if (!conn) { | |
1996 | /* In the middle of shuting down */ | |
242f9dcb | 1997 | rc = BLK_EH_RESET_TIMER; |
f6d5180c MC |
1998 | goto done; |
1999 | } | |
2000 | ||
d355e57d MC |
2001 | /* |
2002 | * If we have sent (at least queued to the network layer) a pdu or | |
2003 | * recvd one for the task since the last timeout ask for | |
2004 | * more time. If on the next timeout we have not made progress | |
2005 | * we can check if it is the task or connection when we send the | |
2006 | * nop as a ping. | |
2007 | */ | |
92ed4d69 | 2008 | if (time_after(task->last_xfer, task->last_timeout)) { |
bd2199d4 EZ |
2009 | ISCSI_DBG_EH(session, "Command making progress. Asking " |
2010 | "scsi-ml for more time to complete. " | |
92ed4d69 | 2011 | "Last data xfer at %lu. Last timeout was at " |
bd2199d4 | 2012 | "%lu\n.", task->last_xfer, task->last_timeout); |
d355e57d MC |
2013 | task->have_checked_conn = false; |
2014 | rc = BLK_EH_RESET_TIMER; | |
2015 | goto done; | |
2016 | } | |
2017 | ||
f6d5180c MC |
2018 | if (!conn->recv_timeout && !conn->ping_timeout) |
2019 | goto done; | |
2020 | /* | |
2021 | * if the ping timedout then we are in the middle of cleaning up | |
2022 | * and can let the iscsi eh handle it | |
2023 | */ | |
4c48a829 | 2024 | if (iscsi_has_ping_timed_out(conn)) { |
242f9dcb | 2025 | rc = BLK_EH_RESET_TIMER; |
4c48a829 MC |
2026 | goto done; |
2027 | } | |
d355e57d | 2028 | |
92ed4d69 MC |
2029 | for (i = 0; i < conn->session->cmds_max; i++) { |
2030 | running_task = conn->session->cmds[i]; | |
2031 | if (!running_task->sc || running_task == task || | |
2032 | running_task->state != ISCSI_TASK_RUNNING) | |
2033 | continue; | |
2034 | ||
2035 | /* | |
2036 | * Only check if cmds started before this one have made | |
2037 | * progress, or this could never fail | |
2038 | */ | |
2039 | if (time_after(running_task->sc->jiffies_at_alloc, | |
2040 | task->sc->jiffies_at_alloc)) | |
2041 | continue; | |
2042 | ||
2043 | if (time_after(running_task->last_xfer, task->last_timeout)) { | |
2044 | /* | |
2045 | * This task has not made progress, but a task | |
2046 | * started before us has transferred data since | |
2047 | * we started/last-checked. We could be queueing | |
2048 | * too many tasks or the LU is bad. | |
2049 | * | |
2050 | * If the device is bad the cmds ahead of us on | |
2051 | * other devs will complete, and this loop will | |
2052 | * eventually fail starting the scsi eh. | |
2053 | */ | |
2054 | ISCSI_DBG_EH(session, "Command has not made progress " | |
2055 | "but commands ahead of it have. " | |
2056 | "Asking scsi-ml for more time to " | |
2057 | "complete. Our last xfer vs running task " | |
2058 | "last xfer %lu/%lu. Last check %lu.\n", | |
2059 | task->last_xfer, running_task->last_xfer, | |
2060 | task->last_timeout); | |
2061 | rc = BLK_EH_RESET_TIMER; | |
2062 | goto done; | |
2063 | } | |
2064 | } | |
2065 | ||
d355e57d MC |
2066 | /* Assumes nop timeout is shorter than scsi cmd timeout */ |
2067 | if (task->have_checked_conn) | |
2068 | goto done; | |
2069 | ||
f6d5180c | 2070 | /* |
d355e57d MC |
2071 | * Checking the transport already or nop from a cmd timeout still |
2072 | * running | |
f6d5180c | 2073 | */ |
d355e57d MC |
2074 | if (conn->ping_task) { |
2075 | task->have_checked_conn = true; | |
242f9dcb | 2076 | rc = BLK_EH_RESET_TIMER; |
4c48a829 MC |
2077 | goto done; |
2078 | } | |
2079 | ||
d355e57d MC |
2080 | /* Make sure there is a transport check done */ |
2081 | iscsi_send_nopout(conn, NULL); | |
2082 | task->have_checked_conn = true; | |
2083 | rc = BLK_EH_RESET_TIMER; | |
2084 | ||
f6d5180c | 2085 | done: |
d355e57d MC |
2086 | if (task) |
2087 | task->last_timeout = jiffies; | |
659743b0 | 2088 | spin_unlock(&session->frwd_lock); |
bd2199d4 | 2089 | ISCSI_DBG_EH(session, "return %s\n", rc == BLK_EH_RESET_TIMER ? |
d7549412 | 2090 | "timer reset" : "shutdown or nh"); |
f6d5180c MC |
2091 | return rc; |
2092 | } | |
b6a05c82 | 2093 | EXPORT_SYMBOL_GPL(iscsi_eh_cmd_timed_out); |
f6d5180c | 2094 | |
2c4b9637 | 2095 | static void iscsi_check_transport_timeouts(struct timer_list *t) |
f6d5180c | 2096 | { |
2c4b9637 | 2097 | struct iscsi_conn *conn = from_timer(conn, t, transport_timer); |
f6d5180c | 2098 | struct iscsi_session *session = conn->session; |
4cf10435 | 2099 | unsigned long recv_timeout, next_timeout = 0, last_recv; |
f6d5180c | 2100 | |
659743b0 | 2101 | spin_lock(&session->frwd_lock); |
f6d5180c MC |
2102 | if (session->state != ISCSI_STATE_LOGGED_IN) |
2103 | goto done; | |
2104 | ||
4cf10435 MC |
2105 | recv_timeout = conn->recv_timeout; |
2106 | if (!recv_timeout) | |
f6d5180c MC |
2107 | goto done; |
2108 | ||
4cf10435 | 2109 | recv_timeout *= HZ; |
f6d5180c | 2110 | last_recv = conn->last_recv; |
4c48a829 MC |
2111 | |
2112 | if (iscsi_has_ping_timed_out(conn)) { | |
322d739d | 2113 | iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs " |
4c48a829 MC |
2114 | "expired, recv timeout %d, last rx %lu, " |
2115 | "last ping %lu, now %lu\n", | |
2116 | conn->ping_timeout, conn->recv_timeout, | |
2117 | last_recv, conn->last_ping, jiffies); | |
659743b0 | 2118 | spin_unlock(&session->frwd_lock); |
09ff742c | 2119 | iscsi_conn_failure(conn, ISCSI_ERR_NOP_TIMEDOUT); |
f6d5180c MC |
2120 | return; |
2121 | } | |
2122 | ||
4cf10435 | 2123 | if (time_before_eq(last_recv + recv_timeout, jiffies)) { |
c8611f97 | 2124 | /* send a ping to try to provoke some traffic */ |
1b2c7af8 | 2125 | ISCSI_DBG_CONN(conn, "Sending nopout as ping\n"); |
52f5664a AN |
2126 | if (iscsi_send_nopout(conn, NULL)) |
2127 | next_timeout = jiffies + (1 * HZ); | |
2128 | else | |
2129 | next_timeout = conn->last_ping + (conn->ping_timeout * HZ); | |
ad294e9c | 2130 | } else |
4cf10435 | 2131 | next_timeout = last_recv + recv_timeout; |
f6d5180c | 2132 | |
1b2c7af8 | 2133 | ISCSI_DBG_CONN(conn, "Setting next tmo %lu\n", next_timeout); |
ad294e9c | 2134 | mod_timer(&conn->transport_timer, next_timeout); |
f6d5180c | 2135 | done: |
659743b0 | 2136 | spin_unlock(&session->frwd_lock); |
f6d5180c MC |
2137 | } |
2138 | ||
9c19a7d0 | 2139 | static void iscsi_prep_abort_task_pdu(struct iscsi_task *task, |
843c0a8a MC |
2140 | struct iscsi_tm *hdr) |
2141 | { | |
2142 | memset(hdr, 0, sizeof(*hdr)); | |
2143 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
2144 | hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK; | |
2145 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
55bdabdf | 2146 | hdr->lun = task->lun; |
577577da MC |
2147 | hdr->rtt = task->hdr_itt; |
2148 | hdr->refcmdsn = task->cmdsn; | |
843c0a8a MC |
2149 | } |
2150 | ||
7996a778 MC |
2151 | int iscsi_eh_abort(struct scsi_cmnd *sc) |
2152 | { | |
75613521 MC |
2153 | struct iscsi_cls_session *cls_session; |
2154 | struct iscsi_session *session; | |
f47f2cf5 | 2155 | struct iscsi_conn *conn; |
9c19a7d0 | 2156 | struct iscsi_task *task; |
843c0a8a | 2157 | struct iscsi_tm *hdr; |
e9e410e8 | 2158 | int age; |
7996a778 | 2159 | |
75613521 MC |
2160 | cls_session = starget_to_session(scsi_target(sc->device)); |
2161 | session = cls_session->dd_data; | |
2162 | ||
bd2199d4 | 2163 | ISCSI_DBG_EH(session, "aborting sc %p\n", sc); |
4421c9eb | 2164 | |
6724add1 | 2165 | mutex_lock(&session->eh_mutex); |
659743b0 | 2166 | spin_lock_bh(&session->frwd_lock); |
f47f2cf5 MC |
2167 | /* |
2168 | * if session was ISCSI_STATE_IN_RECOVERY then we may not have | |
2169 | * got the command. | |
2170 | */ | |
2171 | if (!sc->SCp.ptr) { | |
bd2199d4 EZ |
2172 | ISCSI_DBG_EH(session, "sc never reached iscsi layer or " |
2173 | "it completed.\n"); | |
659743b0 | 2174 | spin_unlock_bh(&session->frwd_lock); |
6724add1 | 2175 | mutex_unlock(&session->eh_mutex); |
f47f2cf5 MC |
2176 | return SUCCESS; |
2177 | } | |
2178 | ||
7996a778 MC |
2179 | /* |
2180 | * If we are not logged in or we have started a new session | |
2181 | * then let the host reset code handle this | |
2182 | */ | |
843c0a8a MC |
2183 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN || |
2184 | sc->SCp.phase != session->age) { | |
659743b0 | 2185 | spin_unlock_bh(&session->frwd_lock); |
843c0a8a | 2186 | mutex_unlock(&session->eh_mutex); |
bd2199d4 | 2187 | ISCSI_DBG_EH(session, "failing abort due to dropped " |
4421c9eb | 2188 | "session.\n"); |
843c0a8a MC |
2189 | return FAILED; |
2190 | } | |
2191 | ||
2192 | conn = session->leadconn; | |
2193 | conn->eh_abort_cnt++; | |
2194 | age = session->age; | |
2195 | ||
9c19a7d0 | 2196 | task = (struct iscsi_task *)sc->SCp.ptr; |
bd2199d4 EZ |
2197 | ISCSI_DBG_EH(session, "aborting [sc %p itt 0x%x]\n", |
2198 | sc, task->itt); | |
7996a778 | 2199 | |
9c19a7d0 MC |
2200 | /* task completed before time out */ |
2201 | if (!task->sc) { | |
bd2199d4 | 2202 | ISCSI_DBG_EH(session, "sc completed while abort in progress\n"); |
77a23c21 | 2203 | goto success; |
7ea8b828 | 2204 | } |
7996a778 | 2205 | |
9c19a7d0 | 2206 | if (task->state == ISCSI_TASK_PENDING) { |
b3cd5050 | 2207 | fail_scsi_task(task, DID_ABORT); |
77a23c21 MC |
2208 | goto success; |
2209 | } | |
7996a778 | 2210 | |
843c0a8a MC |
2211 | /* only have one tmf outstanding at a time */ |
2212 | if (conn->tmf_state != TMF_INITIAL) | |
7996a778 | 2213 | goto failed; |
843c0a8a | 2214 | conn->tmf_state = TMF_QUEUED; |
7996a778 | 2215 | |
843c0a8a | 2216 | hdr = &conn->tmhdr; |
9c19a7d0 | 2217 | iscsi_prep_abort_task_pdu(task, hdr); |
843c0a8a | 2218 | |
e9e410e8 | 2219 | if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout)) |
843c0a8a | 2220 | goto failed; |
843c0a8a MC |
2221 | |
2222 | switch (conn->tmf_state) { | |
2223 | case TMF_SUCCESS: | |
659743b0 | 2224 | spin_unlock_bh(&session->frwd_lock); |
913e5bf4 MC |
2225 | /* |
2226 | * stop tx side incase the target had sent a abort rsp but | |
2227 | * the initiator was still writing out data. | |
2228 | */ | |
6724add1 | 2229 | iscsi_suspend_tx(conn); |
77a23c21 | 2230 | /* |
913e5bf4 MC |
2231 | * we do not stop the recv side because targets have been |
2232 | * good and have never sent us a successful tmf response | |
2233 | * then sent more data for the cmd. | |
77a23c21 | 2234 | */ |
659743b0 | 2235 | spin_lock_bh(&session->frwd_lock); |
b3cd5050 | 2236 | fail_scsi_task(task, DID_ABORT); |
843c0a8a | 2237 | conn->tmf_state = TMF_INITIAL; |
5d12c05e | 2238 | memset(hdr, 0, sizeof(*hdr)); |
659743b0 | 2239 | spin_unlock_bh(&session->frwd_lock); |
6724add1 | 2240 | iscsi_start_tx(conn); |
77a23c21 | 2241 | goto success_unlocked; |
843c0a8a | 2242 | case TMF_TIMEDOUT: |
659743b0 | 2243 | spin_unlock_bh(&session->frwd_lock); |
df4da5cd | 2244 | iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); |
843c0a8a MC |
2245 | goto failed_unlocked; |
2246 | case TMF_NOT_FOUND: | |
2247 | if (!sc->SCp.ptr) { | |
2248 | conn->tmf_state = TMF_INITIAL; | |
5d12c05e | 2249 | memset(hdr, 0, sizeof(*hdr)); |
9c19a7d0 | 2250 | /* task completed before tmf abort response */ |
bd2199d4 EZ |
2251 | ISCSI_DBG_EH(session, "sc completed while abort in " |
2252 | "progress\n"); | |
77a23c21 | 2253 | goto success; |
7ea8b828 MC |
2254 | } |
2255 | /* fall through */ | |
2256 | default: | |
843c0a8a MC |
2257 | conn->tmf_state = TMF_INITIAL; |
2258 | goto failed; | |
7996a778 MC |
2259 | } |
2260 | ||
77a23c21 | 2261 | success: |
659743b0 | 2262 | spin_unlock_bh(&session->frwd_lock); |
77a23c21 | 2263 | success_unlocked: |
bd2199d4 EZ |
2264 | ISCSI_DBG_EH(session, "abort success [sc %p itt 0x%x]\n", |
2265 | sc, task->itt); | |
6724add1 | 2266 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
2267 | return SUCCESS; |
2268 | ||
2269 | failed: | |
659743b0 | 2270 | spin_unlock_bh(&session->frwd_lock); |
77a23c21 | 2271 | failed_unlocked: |
bd2199d4 EZ |
2272 | ISCSI_DBG_EH(session, "abort failed [sc %p itt 0x%x]\n", sc, |
2273 | task ? task->itt : 0); | |
6724add1 | 2274 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
2275 | return FAILED; |
2276 | } | |
2277 | EXPORT_SYMBOL_GPL(iscsi_eh_abort); | |
2278 | ||
843c0a8a MC |
2279 | static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr) |
2280 | { | |
2281 | memset(hdr, 0, sizeof(*hdr)); | |
2282 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
2283 | hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK; | |
2284 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
55bdabdf | 2285 | int_to_scsilun(sc->device->lun, &hdr->lun); |
f6d5180c | 2286 | hdr->rtt = RESERVED_ITT; |
843c0a8a MC |
2287 | } |
2288 | ||
2289 | int iscsi_eh_device_reset(struct scsi_cmnd *sc) | |
2290 | { | |
75613521 MC |
2291 | struct iscsi_cls_session *cls_session; |
2292 | struct iscsi_session *session; | |
843c0a8a MC |
2293 | struct iscsi_conn *conn; |
2294 | struct iscsi_tm *hdr; | |
2295 | int rc = FAILED; | |
2296 | ||
75613521 MC |
2297 | cls_session = starget_to_session(scsi_target(sc->device)); |
2298 | session = cls_session->dd_data; | |
2299 | ||
9cb78c16 HR |
2300 | ISCSI_DBG_EH(session, "LU Reset [sc %p lun %llu]\n", sc, |
2301 | sc->device->lun); | |
843c0a8a MC |
2302 | |
2303 | mutex_lock(&session->eh_mutex); | |
659743b0 | 2304 | spin_lock_bh(&session->frwd_lock); |
843c0a8a MC |
2305 | /* |
2306 | * Just check if we are not logged in. We cannot check for | |
2307 | * the phase because the reset could come from a ioctl. | |
2308 | */ | |
2309 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN) | |
2310 | goto unlock; | |
2311 | conn = session->leadconn; | |
2312 | ||
2313 | /* only have one tmf outstanding at a time */ | |
2314 | if (conn->tmf_state != TMF_INITIAL) | |
2315 | goto unlock; | |
2316 | conn->tmf_state = TMF_QUEUED; | |
2317 | ||
2318 | hdr = &conn->tmhdr; | |
2319 | iscsi_prep_lun_reset_pdu(sc, hdr); | |
2320 | ||
9c19a7d0 | 2321 | if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age, |
f6d5180c | 2322 | session->lu_reset_timeout)) { |
843c0a8a MC |
2323 | rc = FAILED; |
2324 | goto unlock; | |
2325 | } | |
2326 | ||
2327 | switch (conn->tmf_state) { | |
2328 | case TMF_SUCCESS: | |
2329 | break; | |
2330 | case TMF_TIMEDOUT: | |
659743b0 | 2331 | spin_unlock_bh(&session->frwd_lock); |
df4da5cd | 2332 | iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); |
843c0a8a MC |
2333 | goto done; |
2334 | default: | |
2335 | conn->tmf_state = TMF_INITIAL; | |
2336 | goto unlock; | |
2337 | } | |
2338 | ||
2339 | rc = SUCCESS; | |
659743b0 | 2340 | spin_unlock_bh(&session->frwd_lock); |
843c0a8a MC |
2341 | |
2342 | iscsi_suspend_tx(conn); | |
913e5bf4 | 2343 | |
659743b0 | 2344 | spin_lock_bh(&session->frwd_lock); |
5d12c05e | 2345 | memset(hdr, 0, sizeof(*hdr)); |
3bbaaad9 | 2346 | fail_scsi_tasks(conn, sc->device->lun, DID_ERROR); |
843c0a8a | 2347 | conn->tmf_state = TMF_INITIAL; |
659743b0 | 2348 | spin_unlock_bh(&session->frwd_lock); |
843c0a8a MC |
2349 | |
2350 | iscsi_start_tx(conn); | |
2351 | goto done; | |
2352 | ||
2353 | unlock: | |
659743b0 | 2354 | spin_unlock_bh(&session->frwd_lock); |
843c0a8a | 2355 | done: |
bd2199d4 EZ |
2356 | ISCSI_DBG_EH(session, "dev reset result = %s\n", |
2357 | rc == SUCCESS ? "SUCCESS" : "FAILED"); | |
843c0a8a MC |
2358 | mutex_unlock(&session->eh_mutex); |
2359 | return rc; | |
2360 | } | |
2361 | EXPORT_SYMBOL_GPL(iscsi_eh_device_reset); | |
2362 | ||
3fe5ae8b MC |
2363 | void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session) |
2364 | { | |
2365 | struct iscsi_session *session = cls_session->dd_data; | |
2366 | ||
659743b0 | 2367 | spin_lock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2368 | if (session->state != ISCSI_STATE_LOGGED_IN) { |
2369 | session->state = ISCSI_STATE_RECOVERY_FAILED; | |
2370 | if (session->leadconn) | |
2371 | wake_up(&session->leadconn->ehwait); | |
2372 | } | |
659743b0 | 2373 | spin_unlock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2374 | } |
2375 | EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout); | |
2376 | ||
2377 | /** | |
2378 | * iscsi_eh_session_reset - drop session and attempt relogin | |
2379 | * @sc: scsi command | |
2380 | * | |
2381 | * This function will wait for a relogin, session termination from | |
2382 | * userspace, or a recovery/replacement timeout. | |
2383 | */ | |
309ce156 | 2384 | int iscsi_eh_session_reset(struct scsi_cmnd *sc) |
3fe5ae8b MC |
2385 | { |
2386 | struct iscsi_cls_session *cls_session; | |
2387 | struct iscsi_session *session; | |
2388 | struct iscsi_conn *conn; | |
2389 | ||
2390 | cls_session = starget_to_session(scsi_target(sc->device)); | |
2391 | session = cls_session->dd_data; | |
2392 | conn = session->leadconn; | |
2393 | ||
2394 | mutex_lock(&session->eh_mutex); | |
659743b0 | 2395 | spin_lock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2396 | if (session->state == ISCSI_STATE_TERMINATE) { |
2397 | failed: | |
2398 | ISCSI_DBG_EH(session, | |
2399 | "failing session reset: Could not log back into " | |
5db6dd14 FH |
2400 | "%s [age %d]\n", session->targetname, |
2401 | session->age); | |
659743b0 | 2402 | spin_unlock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2403 | mutex_unlock(&session->eh_mutex); |
2404 | return FAILED; | |
2405 | } | |
2406 | ||
659743b0 | 2407 | spin_unlock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2408 | mutex_unlock(&session->eh_mutex); |
2409 | /* | |
2410 | * we drop the lock here but the leadconn cannot be destoyed while | |
2411 | * we are in the scsi eh | |
2412 | */ | |
df4da5cd | 2413 | iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); |
3fe5ae8b MC |
2414 | |
2415 | ISCSI_DBG_EH(session, "wait for relogin\n"); | |
2416 | wait_event_interruptible(conn->ehwait, | |
2417 | session->state == ISCSI_STATE_TERMINATE || | |
2418 | session->state == ISCSI_STATE_LOGGED_IN || | |
2419 | session->state == ISCSI_STATE_RECOVERY_FAILED); | |
2420 | if (signal_pending(current)) | |
2421 | flush_signals(current); | |
2422 | ||
2423 | mutex_lock(&session->eh_mutex); | |
659743b0 | 2424 | spin_lock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2425 | if (session->state == ISCSI_STATE_LOGGED_IN) { |
2426 | ISCSI_DBG_EH(session, | |
2427 | "session reset succeeded for %s,%s\n", | |
2428 | session->targetname, conn->persistent_address); | |
2429 | } else | |
2430 | goto failed; | |
659743b0 | 2431 | spin_unlock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2432 | mutex_unlock(&session->eh_mutex); |
2433 | return SUCCESS; | |
2434 | } | |
309ce156 | 2435 | EXPORT_SYMBOL_GPL(iscsi_eh_session_reset); |
3fe5ae8b MC |
2436 | |
2437 | static void iscsi_prep_tgt_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr) | |
2438 | { | |
2439 | memset(hdr, 0, sizeof(*hdr)); | |
2440 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
2441 | hdr->flags = ISCSI_TM_FUNC_TARGET_WARM_RESET & ISCSI_FLAG_TM_FUNC_MASK; | |
2442 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
2443 | hdr->rtt = RESERVED_ITT; | |
2444 | } | |
2445 | ||
2446 | /** | |
2447 | * iscsi_eh_target_reset - reset target | |
2448 | * @sc: scsi command | |
2449 | * | |
309ce156 | 2450 | * This will attempt to send a warm target reset. |
3fe5ae8b | 2451 | */ |
3907adf6 | 2452 | static int iscsi_eh_target_reset(struct scsi_cmnd *sc) |
3fe5ae8b MC |
2453 | { |
2454 | struct iscsi_cls_session *cls_session; | |
2455 | struct iscsi_session *session; | |
2456 | struct iscsi_conn *conn; | |
2457 | struct iscsi_tm *hdr; | |
2458 | int rc = FAILED; | |
2459 | ||
2460 | cls_session = starget_to_session(scsi_target(sc->device)); | |
2461 | session = cls_session->dd_data; | |
2462 | ||
2463 | ISCSI_DBG_EH(session, "tgt Reset [sc %p tgt %s]\n", sc, | |
2464 | session->targetname); | |
2465 | ||
2466 | mutex_lock(&session->eh_mutex); | |
659743b0 | 2467 | spin_lock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2468 | /* |
2469 | * Just check if we are not logged in. We cannot check for | |
2470 | * the phase because the reset could come from a ioctl. | |
2471 | */ | |
2472 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN) | |
2473 | goto unlock; | |
2474 | conn = session->leadconn; | |
2475 | ||
2476 | /* only have one tmf outstanding at a time */ | |
2477 | if (conn->tmf_state != TMF_INITIAL) | |
2478 | goto unlock; | |
2479 | conn->tmf_state = TMF_QUEUED; | |
2480 | ||
2481 | hdr = &conn->tmhdr; | |
2482 | iscsi_prep_tgt_reset_pdu(sc, hdr); | |
2483 | ||
2484 | if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age, | |
2485 | session->tgt_reset_timeout)) { | |
2486 | rc = FAILED; | |
2487 | goto unlock; | |
2488 | } | |
2489 | ||
2490 | switch (conn->tmf_state) { | |
2491 | case TMF_SUCCESS: | |
2492 | break; | |
2493 | case TMF_TIMEDOUT: | |
659743b0 | 2494 | spin_unlock_bh(&session->frwd_lock); |
df4da5cd | 2495 | iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); |
3fe5ae8b MC |
2496 | goto done; |
2497 | default: | |
2498 | conn->tmf_state = TMF_INITIAL; | |
2499 | goto unlock; | |
2500 | } | |
2501 | ||
2502 | rc = SUCCESS; | |
659743b0 | 2503 | spin_unlock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2504 | |
2505 | iscsi_suspend_tx(conn); | |
2506 | ||
659743b0 | 2507 | spin_lock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2508 | memset(hdr, 0, sizeof(*hdr)); |
2509 | fail_scsi_tasks(conn, -1, DID_ERROR); | |
2510 | conn->tmf_state = TMF_INITIAL; | |
659743b0 | 2511 | spin_unlock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2512 | |
2513 | iscsi_start_tx(conn); | |
2514 | goto done; | |
2515 | ||
2516 | unlock: | |
659743b0 | 2517 | spin_unlock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2518 | done: |
2519 | ISCSI_DBG_EH(session, "tgt %s reset result = %s\n", session->targetname, | |
2520 | rc == SUCCESS ? "SUCCESS" : "FAILED"); | |
2521 | mutex_unlock(&session->eh_mutex); | |
309ce156 JK |
2522 | return rc; |
2523 | } | |
3fe5ae8b | 2524 | |
309ce156 JK |
2525 | /** |
2526 | * iscsi_eh_recover_target - reset target and possibly the session | |
2527 | * @sc: scsi command | |
2528 | * | |
2529 | * This will attempt to send a warm target reset. If that fails, | |
2530 | * we will escalate to ERL0 session recovery. | |
2531 | */ | |
2532 | int iscsi_eh_recover_target(struct scsi_cmnd *sc) | |
2533 | { | |
2534 | int rc; | |
2535 | ||
2536 | rc = iscsi_eh_target_reset(sc); | |
3fe5ae8b MC |
2537 | if (rc == FAILED) |
2538 | rc = iscsi_eh_session_reset(sc); | |
2539 | return rc; | |
2540 | } | |
309ce156 | 2541 | EXPORT_SYMBOL_GPL(iscsi_eh_recover_target); |
3fe5ae8b | 2542 | |
6320377f OK |
2543 | /* |
2544 | * Pre-allocate a pool of @max items of @item_size. By default, the pool | |
2545 | * should be accessed via kfifo_{get,put} on q->queue. | |
2546 | * Optionally, the caller can obtain the array of object pointers | |
2547 | * by passing in a non-NULL @items pointer | |
2548 | */ | |
7996a778 | 2549 | int |
6320377f | 2550 | iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size) |
7996a778 | 2551 | { |
6320377f | 2552 | int i, num_arrays = 1; |
7996a778 | 2553 | |
6320377f | 2554 | memset(q, 0, sizeof(*q)); |
7996a778 MC |
2555 | |
2556 | q->max = max; | |
6320377f OK |
2557 | |
2558 | /* If the user passed an items pointer, he wants a copy of | |
2559 | * the array. */ | |
2560 | if (items) | |
2561 | num_arrays++; | |
778e1cdd | 2562 | q->pool = kvcalloc(num_arrays * max, sizeof(void *), GFP_KERNEL); |
6320377f | 2563 | if (q->pool == NULL) |
f474a37b | 2564 | return -ENOMEM; |
7996a778 | 2565 | |
c1e13f25 | 2566 | kfifo_init(&q->queue, (void*)q->pool, max * sizeof(void*)); |
7996a778 MC |
2567 | |
2568 | for (i = 0; i < max; i++) { | |
6320377f | 2569 | q->pool[i] = kzalloc(item_size, GFP_KERNEL); |
7996a778 | 2570 | if (q->pool[i] == NULL) { |
6320377f OK |
2571 | q->max = i; |
2572 | goto enomem; | |
7996a778 | 2573 | } |
7acd72eb | 2574 | kfifo_in(&q->queue, (void*)&q->pool[i], sizeof(void*)); |
7996a778 | 2575 | } |
6320377f OK |
2576 | |
2577 | if (items) { | |
2578 | *items = q->pool + max; | |
2579 | memcpy(*items, q->pool, max * sizeof(void *)); | |
2580 | } | |
2581 | ||
7996a778 | 2582 | return 0; |
6320377f OK |
2583 | |
2584 | enomem: | |
2585 | iscsi_pool_free(q); | |
2586 | return -ENOMEM; | |
7996a778 MC |
2587 | } |
2588 | EXPORT_SYMBOL_GPL(iscsi_pool_init); | |
2589 | ||
6320377f | 2590 | void iscsi_pool_free(struct iscsi_pool *q) |
7996a778 MC |
2591 | { |
2592 | int i; | |
2593 | ||
2594 | for (i = 0; i < q->max; i++) | |
6320377f | 2595 | kfree(q->pool[i]); |
bfcc62ed | 2596 | kvfree(q->pool); |
7996a778 MC |
2597 | } |
2598 | EXPORT_SYMBOL_GPL(iscsi_pool_free); | |
2599 | ||
a4804cd6 MC |
2600 | /** |
2601 | * iscsi_host_add - add host to system | |
2602 | * @shost: scsi host | |
2603 | * @pdev: parent device | |
2604 | * | |
2605 | * This should be called by partial offload and software iscsi drivers | |
2606 | * to add a host to the system. | |
2607 | */ | |
2608 | int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev) | |
2609 | { | |
8e9a20ce MC |
2610 | if (!shost->can_queue) |
2611 | shost->can_queue = ISCSI_DEF_XMIT_CMDS_MAX; | |
2612 | ||
4d108350 MC |
2613 | if (!shost->cmd_per_lun) |
2614 | shost->cmd_per_lun = ISCSI_DEF_CMD_PER_LUN; | |
2615 | ||
a4804cd6 MC |
2616 | return scsi_add_host(shost, pdev); |
2617 | } | |
2618 | EXPORT_SYMBOL_GPL(iscsi_host_add); | |
2619 | ||
2620 | /** | |
2621 | * iscsi_host_alloc - allocate a host and driver data | |
2622 | * @sht: scsi host template | |
2623 | * @dd_data_size: driver host data size | |
32ae763e | 2624 | * @xmit_can_sleep: bool indicating if LLD will queue IO from a work queue |
a4804cd6 MC |
2625 | * |
2626 | * This should be called by partial offload and software iscsi drivers. | |
2627 | * To access the driver specific memory use the iscsi_host_priv() macro. | |
2628 | */ | |
2629 | struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht, | |
4d108350 | 2630 | int dd_data_size, bool xmit_can_sleep) |
75613521 | 2631 | { |
a4804cd6 | 2632 | struct Scsi_Host *shost; |
e5bd7b54 | 2633 | struct iscsi_host *ihost; |
a4804cd6 MC |
2634 | |
2635 | shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size); | |
2636 | if (!shost) | |
2637 | return NULL; | |
e5bd7b54 | 2638 | ihost = shost_priv(shost); |
32ae763e MC |
2639 | |
2640 | if (xmit_can_sleep) { | |
2641 | snprintf(ihost->workq_name, sizeof(ihost->workq_name), | |
2642 | "iscsi_q_%d", shost->host_no); | |
2643 | ihost->workq = create_singlethread_workqueue(ihost->workq_name); | |
2644 | if (!ihost->workq) | |
2645 | goto free_host; | |
2646 | } | |
2647 | ||
e5bd7b54 MC |
2648 | spin_lock_init(&ihost->lock); |
2649 | ihost->state = ISCSI_HOST_SETUP; | |
2650 | ihost->num_sessions = 0; | |
2651 | init_waitqueue_head(&ihost->session_removal_wq); | |
a4804cd6 | 2652 | return shost; |
32ae763e MC |
2653 | |
2654 | free_host: | |
2655 | scsi_host_put(shost); | |
2656 | return NULL; | |
a4804cd6 MC |
2657 | } |
2658 | EXPORT_SYMBOL_GPL(iscsi_host_alloc); | |
2659 | ||
e5bd7b54 MC |
2660 | static void iscsi_notify_host_removed(struct iscsi_cls_session *cls_session) |
2661 | { | |
40a06e75 | 2662 | iscsi_session_failure(cls_session->dd_data, ISCSI_ERR_INVALID_HOST); |
e5bd7b54 MC |
2663 | } |
2664 | ||
a4804cd6 MC |
2665 | /** |
2666 | * iscsi_host_remove - remove host and sessions | |
2667 | * @shost: scsi host | |
2668 | * | |
e5bd7b54 MC |
2669 | * If there are any sessions left, this will initiate the removal and wait |
2670 | * for the completion. | |
a4804cd6 MC |
2671 | */ |
2672 | void iscsi_host_remove(struct Scsi_Host *shost) | |
2673 | { | |
e5bd7b54 MC |
2674 | struct iscsi_host *ihost = shost_priv(shost); |
2675 | unsigned long flags; | |
2676 | ||
2677 | spin_lock_irqsave(&ihost->lock, flags); | |
2678 | ihost->state = ISCSI_HOST_REMOVED; | |
2679 | spin_unlock_irqrestore(&ihost->lock, flags); | |
2680 | ||
2681 | iscsi_host_for_each_session(shost, iscsi_notify_host_removed); | |
2682 | wait_event_interruptible(ihost->session_removal_wq, | |
2683 | ihost->num_sessions == 0); | |
2684 | if (signal_pending(current)) | |
2685 | flush_signals(current); | |
2686 | ||
a4804cd6 | 2687 | scsi_remove_host(shost); |
32ae763e MC |
2688 | if (ihost->workq) |
2689 | destroy_workqueue(ihost->workq); | |
75613521 | 2690 | } |
a4804cd6 | 2691 | EXPORT_SYMBOL_GPL(iscsi_host_remove); |
7996a778 | 2692 | |
a4804cd6 | 2693 | void iscsi_host_free(struct Scsi_Host *shost) |
75613521 MC |
2694 | { |
2695 | struct iscsi_host *ihost = shost_priv(shost); | |
7996a778 | 2696 | |
75613521 MC |
2697 | kfree(ihost->netdev); |
2698 | kfree(ihost->hwaddress); | |
2699 | kfree(ihost->initiatorname); | |
a4804cd6 | 2700 | scsi_host_put(shost); |
75613521 | 2701 | } |
a4804cd6 | 2702 | EXPORT_SYMBOL_GPL(iscsi_host_free); |
7996a778 | 2703 | |
e5bd7b54 MC |
2704 | static void iscsi_host_dec_session_cnt(struct Scsi_Host *shost) |
2705 | { | |
2706 | struct iscsi_host *ihost = shost_priv(shost); | |
2707 | unsigned long flags; | |
2708 | ||
2709 | shost = scsi_host_get(shost); | |
2710 | if (!shost) { | |
2711 | printk(KERN_ERR "Invalid state. Cannot notify host removal " | |
2712 | "of session teardown event because host already " | |
2713 | "removed.\n"); | |
2714 | return; | |
2715 | } | |
2716 | ||
2717 | spin_lock_irqsave(&ihost->lock, flags); | |
2718 | ihost->num_sessions--; | |
2719 | if (ihost->num_sessions == 0) | |
2720 | wake_up(&ihost->session_removal_wq); | |
2721 | spin_unlock_irqrestore(&ihost->lock, flags); | |
2722 | scsi_host_put(shost); | |
2723 | } | |
2724 | ||
7996a778 MC |
2725 | /** |
2726 | * iscsi_session_setup - create iscsi cls session and host and session | |
7996a778 | 2727 | * @iscsit: iscsi transport template |
75613521 MC |
2728 | * @shost: scsi host |
2729 | * @cmds_max: session can queue | |
ccd4a430 | 2730 | * @dd_size: private driver data size, added to session allocation size |
9c19a7d0 | 2731 | * @cmd_task_size: LLD task private data size |
7996a778 | 2732 | * @initial_cmdsn: initial CmdSN |
ccd4a430 | 2733 | * @id: target ID to add to this session |
7996a778 MC |
2734 | * |
2735 | * This can be used by software iscsi_transports that allocate | |
2736 | * a session per scsi host. | |
3cf7b233 MC |
2737 | * |
2738 | * Callers should set cmds_max to the largest total numer (mgmt + scsi) of | |
2739 | * tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks | |
2740 | * for nop handling and login/logout requests. | |
75613521 | 2741 | */ |
7996a778 | 2742 | struct iscsi_cls_session * |
75613521 | 2743 | iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost, |
b8b9e1b8 | 2744 | uint16_t cmds_max, int dd_size, int cmd_task_size, |
7970634b | 2745 | uint32_t initial_cmdsn, unsigned int id) |
7996a778 | 2746 | { |
e5bd7b54 | 2747 | struct iscsi_host *ihost = shost_priv(shost); |
7996a778 MC |
2748 | struct iscsi_session *session; |
2749 | struct iscsi_cls_session *cls_session; | |
3cf7b233 | 2750 | int cmd_i, scsi_cmds, total_cmds = cmds_max; |
e5bd7b54 MC |
2751 | unsigned long flags; |
2752 | ||
2753 | spin_lock_irqsave(&ihost->lock, flags); | |
2754 | if (ihost->state == ISCSI_HOST_REMOVED) { | |
2755 | spin_unlock_irqrestore(&ihost->lock, flags); | |
2756 | return NULL; | |
2757 | } | |
2758 | ihost->num_sessions++; | |
2759 | spin_unlock_irqrestore(&ihost->lock, flags); | |
8e9a20ce MC |
2760 | |
2761 | if (!total_cmds) | |
2762 | total_cmds = ISCSI_DEF_XMIT_CMDS_MAX; | |
3e5c28ad | 2763 | /* |
3cf7b233 MC |
2764 | * The iscsi layer needs some tasks for nop handling and tmfs, |
2765 | * so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX | |
2766 | * + 1 command for scsi IO. | |
3e5c28ad | 2767 | */ |
3cf7b233 MC |
2768 | if (total_cmds < ISCSI_TOTAL_CMDS_MIN) { |
2769 | printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " | |
2770 | "must be a power of two that is at least %d.\n", | |
2771 | total_cmds, ISCSI_TOTAL_CMDS_MIN); | |
e5bd7b54 | 2772 | goto dec_session_count; |
3cf7b233 MC |
2773 | } |
2774 | ||
2775 | if (total_cmds > ISCSI_TOTAL_CMDS_MAX) { | |
2776 | printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " | |
2777 | "must be a power of 2 less than or equal to %d.\n", | |
2778 | cmds_max, ISCSI_TOTAL_CMDS_MAX); | |
2779 | total_cmds = ISCSI_TOTAL_CMDS_MAX; | |
2780 | } | |
2781 | ||
2782 | if (!is_power_of_2(total_cmds)) { | |
2783 | printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " | |
2784 | "must be a power of 2.\n", total_cmds); | |
2785 | total_cmds = rounddown_pow_of_two(total_cmds); | |
2786 | if (total_cmds < ISCSI_TOTAL_CMDS_MIN) | |
2787 | return NULL; | |
2788 | printk(KERN_INFO "iscsi: Rounding can_queue to %d.\n", | |
2789 | total_cmds); | |
1548271e | 2790 | } |
3cf7b233 | 2791 | scsi_cmds = total_cmds - ISCSI_MGMT_CMDS_MAX; |
1548271e | 2792 | |
5d91e209 | 2793 | cls_session = iscsi_alloc_session(shost, iscsit, |
b8b9e1b8 JK |
2794 | sizeof(struct iscsi_session) + |
2795 | dd_size); | |
75613521 | 2796 | if (!cls_session) |
e5bd7b54 | 2797 | goto dec_session_count; |
75613521 MC |
2798 | session = cls_session->dd_data; |
2799 | session->cls_session = cls_session; | |
7996a778 MC |
2800 | session->host = shost; |
2801 | session->state = ISCSI_STATE_FREE; | |
f6d5180c | 2802 | session->fast_abort = 1; |
3fe5ae8b | 2803 | session->tgt_reset_timeout = 30; |
4cd49ea1 MC |
2804 | session->lu_reset_timeout = 15; |
2805 | session->abort_timeout = 10; | |
3cf7b233 MC |
2806 | session->scsi_cmds_max = scsi_cmds; |
2807 | session->cmds_max = total_cmds; | |
e0726407 | 2808 | session->queued_cmdsn = session->cmdsn = initial_cmdsn; |
7996a778 MC |
2809 | session->exp_cmdsn = initial_cmdsn + 1; |
2810 | session->max_cmdsn = initial_cmdsn + 1; | |
2811 | session->max_r2t = 1; | |
2812 | session->tt = iscsit; | |
b8b9e1b8 | 2813 | session->dd_data = cls_session->dd_data + sizeof(*session); |
659743b0 | 2814 | |
6724add1 | 2815 | mutex_init(&session->eh_mutex); |
659743b0 SP |
2816 | spin_lock_init(&session->frwd_lock); |
2817 | spin_lock_init(&session->back_lock); | |
7996a778 MC |
2818 | |
2819 | /* initialize SCSI PDU commands pool */ | |
2820 | if (iscsi_pool_init(&session->cmdpool, session->cmds_max, | |
2821 | (void***)&session->cmds, | |
9c19a7d0 | 2822 | cmd_task_size + sizeof(struct iscsi_task))) |
7996a778 MC |
2823 | goto cmdpool_alloc_fail; |
2824 | ||
2825 | /* pre-format cmds pool with ITT */ | |
2826 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
9c19a7d0 | 2827 | struct iscsi_task *task = session->cmds[cmd_i]; |
7996a778 | 2828 | |
9c19a7d0 MC |
2829 | if (cmd_task_size) |
2830 | task->dd_data = &task[1]; | |
2831 | task->itt = cmd_i; | |
3bbaaad9 | 2832 | task->state = ISCSI_TASK_FREE; |
9c19a7d0 | 2833 | INIT_LIST_HEAD(&task->running); |
7996a778 MC |
2834 | } |
2835 | ||
f53a88da | 2836 | if (!try_module_get(iscsit->owner)) |
75613521 | 2837 | goto module_get_fail; |
7996a778 | 2838 | |
7970634b | 2839 | if (iscsi_add_session(cls_session, id)) |
75613521 | 2840 | goto cls_session_fail; |
e5bd7b54 | 2841 | |
7996a778 MC |
2842 | return cls_session; |
2843 | ||
2844 | cls_session_fail: | |
75613521 MC |
2845 | module_put(iscsit->owner); |
2846 | module_get_fail: | |
6320377f | 2847 | iscsi_pool_free(&session->cmdpool); |
7996a778 | 2848 | cmdpool_alloc_fail: |
75613521 | 2849 | iscsi_free_session(cls_session); |
e5bd7b54 MC |
2850 | dec_session_count: |
2851 | iscsi_host_dec_session_cnt(shost); | |
7996a778 MC |
2852 | return NULL; |
2853 | } | |
2854 | EXPORT_SYMBOL_GPL(iscsi_session_setup); | |
2855 | ||
2856 | /** | |
2857 | * iscsi_session_teardown - destroy session, host, and cls_session | |
75613521 | 2858 | * @cls_session: iscsi session |
75613521 | 2859 | */ |
7996a778 MC |
2860 | void iscsi_session_teardown(struct iscsi_cls_session *cls_session) |
2861 | { | |
75613521 | 2862 | struct iscsi_session *session = cls_session->dd_data; |
63f75cc8 | 2863 | struct module *owner = cls_session->transport->owner; |
e5bd7b54 | 2864 | struct Scsi_Host *shost = session->host; |
7996a778 | 2865 | |
6320377f | 2866 | iscsi_pool_free(&session->cmdpool); |
7996a778 | 2867 | |
9e10b512 KK |
2868 | iscsi_remove_session(cls_session); |
2869 | ||
b2c64167 MC |
2870 | kfree(session->password); |
2871 | kfree(session->password_in); | |
2872 | kfree(session->username); | |
2873 | kfree(session->username_in); | |
f3ff0c36 | 2874 | kfree(session->targetname); |
3c5c4801 | 2875 | kfree(session->targetalias); |
88dfd340 | 2876 | kfree(session->initiatorname); |
3b9373e9 EW |
2877 | kfree(session->boot_root); |
2878 | kfree(session->boot_nic); | |
2879 | kfree(session->boot_target); | |
88dfd340 | 2880 | kfree(session->ifacename); |
f8525eb4 AC |
2881 | kfree(session->portal_type); |
2882 | kfree(session->discovery_parent_type); | |
f3ff0c36 | 2883 | |
9e10b512 KK |
2884 | iscsi_free_session(cls_session); |
2885 | ||
e5bd7b54 | 2886 | iscsi_host_dec_session_cnt(shost); |
63f75cc8 | 2887 | module_put(owner); |
7996a778 MC |
2888 | } |
2889 | EXPORT_SYMBOL_GPL(iscsi_session_teardown); | |
2890 | ||
2891 | /** | |
2892 | * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn | |
2893 | * @cls_session: iscsi_cls_session | |
5d91e209 | 2894 | * @dd_size: private driver data size |
7996a778 | 2895 | * @conn_idx: cid |
5d91e209 | 2896 | */ |
7996a778 | 2897 | struct iscsi_cls_conn * |
5d91e209 MC |
2898 | iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size, |
2899 | uint32_t conn_idx) | |
7996a778 | 2900 | { |
75613521 | 2901 | struct iscsi_session *session = cls_session->dd_data; |
7996a778 MC |
2902 | struct iscsi_conn *conn; |
2903 | struct iscsi_cls_conn *cls_conn; | |
d36ab6f3 | 2904 | char *data; |
7996a778 | 2905 | |
5d91e209 MC |
2906 | cls_conn = iscsi_create_conn(cls_session, sizeof(*conn) + dd_size, |
2907 | conn_idx); | |
7996a778 MC |
2908 | if (!cls_conn) |
2909 | return NULL; | |
2910 | conn = cls_conn->dd_data; | |
5d91e209 | 2911 | memset(conn, 0, sizeof(*conn) + dd_size); |
7996a778 | 2912 | |
5d91e209 | 2913 | conn->dd_data = cls_conn->dd_data + sizeof(*conn); |
7996a778 MC |
2914 | conn->session = session; |
2915 | conn->cls_conn = cls_conn; | |
2916 | conn->c_stage = ISCSI_CONN_INITIAL_STAGE; | |
2917 | conn->id = conn_idx; | |
2918 | conn->exp_statsn = 0; | |
843c0a8a | 2919 | conn->tmf_state = TMF_INITIAL; |
f6d5180c | 2920 | |
2c4b9637 | 2921 | timer_setup(&conn->transport_timer, iscsi_check_transport_timeouts, 0); |
f6d5180c | 2922 | |
843c0a8a | 2923 | INIT_LIST_HEAD(&conn->mgmtqueue); |
3bbaaad9 | 2924 | INIT_LIST_HEAD(&conn->cmdqueue); |
843c0a8a | 2925 | INIT_LIST_HEAD(&conn->requeue); |
6f8830f5 | 2926 | spin_lock_init(&conn->taskqueuelock); |
c4028958 | 2927 | INIT_WORK(&conn->xmitwork, iscsi_xmitworker); |
7996a778 | 2928 | |
9c19a7d0 | 2929 | /* allocate login_task used for the login/text sequences */ |
659743b0 | 2930 | spin_lock_bh(&session->frwd_lock); |
7acd72eb | 2931 | if (!kfifo_out(&session->cmdpool.queue, |
9c19a7d0 | 2932 | (void*)&conn->login_task, |
7996a778 | 2933 | sizeof(void*))) { |
659743b0 | 2934 | spin_unlock_bh(&session->frwd_lock); |
9c19a7d0 | 2935 | goto login_task_alloc_fail; |
7996a778 | 2936 | } |
659743b0 | 2937 | spin_unlock_bh(&session->frwd_lock); |
7996a778 | 2938 | |
cfeb2cf9 MC |
2939 | data = (char *) __get_free_pages(GFP_KERNEL, |
2940 | get_order(ISCSI_DEF_MAX_RECV_SEG_LEN)); | |
d36ab6f3 | 2941 | if (!data) |
9c19a7d0 MC |
2942 | goto login_task_data_alloc_fail; |
2943 | conn->login_task->data = conn->data = data; | |
d36ab6f3 | 2944 | |
2c4b9637 | 2945 | timer_setup(&conn->tmf_timer, iscsi_tmf_timedout, 0); |
7996a778 MC |
2946 | init_waitqueue_head(&conn->ehwait); |
2947 | ||
2948 | return cls_conn; | |
2949 | ||
9c19a7d0 | 2950 | login_task_data_alloc_fail: |
7acd72eb | 2951 | kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task, |
d36ab6f3 | 2952 | sizeof(void*)); |
9c19a7d0 | 2953 | login_task_alloc_fail: |
7996a778 MC |
2954 | iscsi_destroy_conn(cls_conn); |
2955 | return NULL; | |
2956 | } | |
2957 | EXPORT_SYMBOL_GPL(iscsi_conn_setup); | |
2958 | ||
2959 | /** | |
2960 | * iscsi_conn_teardown - teardown iscsi connection | |
ccd4a430 | 2961 | * @cls_conn: iscsi class connection |
7996a778 MC |
2962 | * |
2963 | * TODO: we may need to make this into a two step process | |
2964 | * like scsi-mls remove + put host | |
2965 | */ | |
2966 | void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn) | |
2967 | { | |
2968 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2969 | struct iscsi_session *session = conn->session; | |
7996a778 | 2970 | |
f6d5180c MC |
2971 | del_timer_sync(&conn->transport_timer); |
2972 | ||
660d0831 | 2973 | mutex_lock(&session->eh_mutex); |
659743b0 | 2974 | spin_lock_bh(&session->frwd_lock); |
7996a778 MC |
2975 | conn->c_stage = ISCSI_CONN_CLEANUP_WAIT; |
2976 | if (session->leadconn == conn) { | |
2977 | /* | |
2978 | * leading connection? then give up on recovery. | |
2979 | */ | |
2980 | session->state = ISCSI_STATE_TERMINATE; | |
2981 | wake_up(&conn->ehwait); | |
2982 | } | |
659743b0 | 2983 | spin_unlock_bh(&session->frwd_lock); |
7996a778 | 2984 | |
779ea120 | 2985 | /* flush queued up work because we free the connection below */ |
843c0a8a | 2986 | iscsi_suspend_tx(conn); |
779ea120 | 2987 | |
659743b0 | 2988 | spin_lock_bh(&session->frwd_lock); |
cfeb2cf9 MC |
2989 | free_pages((unsigned long) conn->data, |
2990 | get_order(ISCSI_DEF_MAX_RECV_SEG_LEN)); | |
f3ff0c36 | 2991 | kfree(conn->persistent_address); |
ae56ff40 | 2992 | kfree(conn->local_ipaddr); |
659743b0 SP |
2993 | /* regular RX path uses back_lock */ |
2994 | spin_lock_bh(&session->back_lock); | |
7acd72eb | 2995 | kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task, |
7996a778 | 2996 | sizeof(void*)); |
659743b0 | 2997 | spin_unlock_bh(&session->back_lock); |
e0726407 | 2998 | if (session->leadconn == conn) |
7996a778 | 2999 | session->leadconn = NULL; |
659743b0 | 3000 | spin_unlock_bh(&session->frwd_lock); |
660d0831 | 3001 | mutex_unlock(&session->eh_mutex); |
7996a778 | 3002 | |
7996a778 MC |
3003 | iscsi_destroy_conn(cls_conn); |
3004 | } | |
3005 | EXPORT_SYMBOL_GPL(iscsi_conn_teardown); | |
3006 | ||
3007 | int iscsi_conn_start(struct iscsi_cls_conn *cls_conn) | |
3008 | { | |
3009 | struct iscsi_conn *conn = cls_conn->dd_data; | |
3010 | struct iscsi_session *session = conn->session; | |
3011 | ||
ffd0436e | 3012 | if (!session) { |
322d739d MC |
3013 | iscsi_conn_printk(KERN_ERR, conn, |
3014 | "can't start unbound connection\n"); | |
7996a778 MC |
3015 | return -EPERM; |
3016 | } | |
3017 | ||
db98ccde MC |
3018 | if ((session->imm_data_en || !session->initial_r2t_en) && |
3019 | session->first_burst > session->max_burst) { | |
322d739d MC |
3020 | iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: " |
3021 | "first_burst %d max_burst %d\n", | |
3022 | session->first_burst, session->max_burst); | |
ffd0436e MC |
3023 | return -EINVAL; |
3024 | } | |
3025 | ||
f6d5180c | 3026 | if (conn->ping_timeout && !conn->recv_timeout) { |
322d739d MC |
3027 | iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of " |
3028 | "zero. Using 5 seconds\n."); | |
f6d5180c MC |
3029 | conn->recv_timeout = 5; |
3030 | } | |
3031 | ||
3032 | if (conn->recv_timeout && !conn->ping_timeout) { | |
322d739d MC |
3033 | iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of " |
3034 | "zero. Using 5 seconds.\n"); | |
f6d5180c MC |
3035 | conn->ping_timeout = 5; |
3036 | } | |
3037 | ||
659743b0 | 3038 | spin_lock_bh(&session->frwd_lock); |
7996a778 MC |
3039 | conn->c_stage = ISCSI_CONN_STARTED; |
3040 | session->state = ISCSI_STATE_LOGGED_IN; | |
e0726407 | 3041 | session->queued_cmdsn = session->cmdsn; |
7996a778 | 3042 | |
f6d5180c MC |
3043 | conn->last_recv = jiffies; |
3044 | conn->last_ping = jiffies; | |
3045 | if (conn->recv_timeout && conn->ping_timeout) | |
3046 | mod_timer(&conn->transport_timer, | |
3047 | jiffies + (conn->recv_timeout * HZ)); | |
3048 | ||
7996a778 MC |
3049 | switch(conn->stop_stage) { |
3050 | case STOP_CONN_RECOVER: | |
3051 | /* | |
3052 | * unblock eh_abort() if it is blocked. re-try all | |
3053 | * commands after successful recovery | |
3054 | */ | |
7996a778 | 3055 | conn->stop_stage = 0; |
843c0a8a | 3056 | conn->tmf_state = TMF_INITIAL; |
7996a778 | 3057 | session->age++; |
8b1d0343 MC |
3058 | if (session->age == 16) |
3059 | session->age = 0; | |
6eabafbe | 3060 | break; |
7996a778 | 3061 | case STOP_CONN_TERM: |
7996a778 | 3062 | conn->stop_stage = 0; |
7996a778 MC |
3063 | break; |
3064 | default: | |
3065 | break; | |
3066 | } | |
659743b0 | 3067 | spin_unlock_bh(&session->frwd_lock); |
7996a778 | 3068 | |
75613521 | 3069 | iscsi_unblock_session(session->cls_session); |
6eabafbe | 3070 | wake_up(&conn->ehwait); |
7996a778 MC |
3071 | return 0; |
3072 | } | |
3073 | EXPORT_SYMBOL_GPL(iscsi_conn_start); | |
3074 | ||
3075 | static void | |
3bbaaad9 | 3076 | fail_mgmt_tasks(struct iscsi_session *session, struct iscsi_conn *conn) |
7996a778 | 3077 | { |
3bbaaad9 | 3078 | struct iscsi_task *task; |
b3cd5050 | 3079 | int i, state; |
7996a778 | 3080 | |
3bbaaad9 MC |
3081 | for (i = 0; i < conn->session->cmds_max; i++) { |
3082 | task = conn->session->cmds[i]; | |
3083 | if (task->sc) | |
3084 | continue; | |
7996a778 | 3085 | |
3bbaaad9 MC |
3086 | if (task->state == ISCSI_TASK_FREE) |
3087 | continue; | |
7996a778 | 3088 | |
3bbaaad9 MC |
3089 | ISCSI_DBG_SESSION(conn->session, |
3090 | "failing mgmt itt 0x%x state %d\n", | |
3091 | task->itt, task->state); | |
b3cd5050 MC |
3092 | state = ISCSI_TASK_ABRT_SESS_RECOV; |
3093 | if (task->state == ISCSI_TASK_PENDING) | |
3094 | state = ISCSI_TASK_COMPLETED; | |
a656183e | 3095 | spin_lock_bh(&session->back_lock); |
b3cd5050 | 3096 | iscsi_complete_task(task, state); |
a656183e | 3097 | spin_unlock_bh(&session->back_lock); |
3bbaaad9 | 3098 | } |
7996a778 MC |
3099 | } |
3100 | ||
656cffc9 MC |
3101 | static void iscsi_start_session_recovery(struct iscsi_session *session, |
3102 | struct iscsi_conn *conn, int flag) | |
7996a778 | 3103 | { |
ed2abc7f MC |
3104 | int old_stop_stage; |
3105 | ||
6724add1 | 3106 | mutex_lock(&session->eh_mutex); |
659743b0 | 3107 | spin_lock_bh(&session->frwd_lock); |
ed2abc7f | 3108 | if (conn->stop_stage == STOP_CONN_TERM) { |
659743b0 | 3109 | spin_unlock_bh(&session->frwd_lock); |
6724add1 MC |
3110 | mutex_unlock(&session->eh_mutex); |
3111 | return; | |
3112 | } | |
3113 | ||
ed2abc7f MC |
3114 | /* |
3115 | * When this is called for the in_login state, we only want to clean | |
9c19a7d0 | 3116 | * up the login task and connection. We do not need to block and set |
67a61114 | 3117 | * the recovery state again |
ed2abc7f | 3118 | */ |
67a61114 MC |
3119 | if (flag == STOP_CONN_TERM) |
3120 | session->state = ISCSI_STATE_TERMINATE; | |
3121 | else if (conn->stop_stage != STOP_CONN_RECOVER) | |
3122 | session->state = ISCSI_STATE_IN_RECOVERY; | |
4ae0a6c1 MC |
3123 | |
3124 | old_stop_stage = conn->stop_stage; | |
3125 | conn->stop_stage = flag; | |
659743b0 | 3126 | spin_unlock_bh(&session->frwd_lock); |
ed2abc7f | 3127 | |
26013ad4 MC |
3128 | del_timer_sync(&conn->transport_timer); |
3129 | iscsi_suspend_tx(conn); | |
3130 | ||
659743b0 | 3131 | spin_lock_bh(&session->frwd_lock); |
67a61114 | 3132 | conn->c_stage = ISCSI_CONN_STOPPED; |
659743b0 | 3133 | spin_unlock_bh(&session->frwd_lock); |
6724add1 | 3134 | |
7996a778 MC |
3135 | /* |
3136 | * for connection level recovery we should not calculate | |
3137 | * header digest. conn->hdr_size used for optimization | |
3138 | * in hdr_extract() and will be re-negotiated at | |
3139 | * set_param() time. | |
3140 | */ | |
3141 | if (flag == STOP_CONN_RECOVER) { | |
3142 | conn->hdrdgst_en = 0; | |
3143 | conn->datadgst_en = 0; | |
656cffc9 | 3144 | if (session->state == ISCSI_STATE_IN_RECOVERY && |
67a61114 | 3145 | old_stop_stage != STOP_CONN_RECOVER) { |
1b2c7af8 | 3146 | ISCSI_DBG_SESSION(session, "blocking session\n"); |
75613521 | 3147 | iscsi_block_session(session->cls_session); |
67a61114 | 3148 | } |
7996a778 | 3149 | } |
656cffc9 | 3150 | |
656cffc9 MC |
3151 | /* |
3152 | * flush queues. | |
3153 | */ | |
659743b0 | 3154 | spin_lock_bh(&session->frwd_lock); |
b3cd5050 | 3155 | fail_scsi_tasks(conn, -1, DID_TRANSPORT_DISRUPTED); |
3bbaaad9 | 3156 | fail_mgmt_tasks(session, conn); |
5d12c05e | 3157 | memset(&conn->tmhdr, 0, sizeof(conn->tmhdr)); |
659743b0 | 3158 | spin_unlock_bh(&session->frwd_lock); |
6724add1 | 3159 | mutex_unlock(&session->eh_mutex); |
7996a778 | 3160 | } |
7996a778 MC |
3161 | |
3162 | void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) | |
3163 | { | |
3164 | struct iscsi_conn *conn = cls_conn->dd_data; | |
3165 | struct iscsi_session *session = conn->session; | |
3166 | ||
3167 | switch (flag) { | |
3168 | case STOP_CONN_RECOVER: | |
3169 | case STOP_CONN_TERM: | |
3170 | iscsi_start_session_recovery(session, conn, flag); | |
8d2860b3 | 3171 | break; |
7996a778 | 3172 | default: |
322d739d MC |
3173 | iscsi_conn_printk(KERN_ERR, conn, |
3174 | "invalid stop flag %d\n", flag); | |
7996a778 MC |
3175 | } |
3176 | } | |
3177 | EXPORT_SYMBOL_GPL(iscsi_conn_stop); | |
3178 | ||
3179 | int iscsi_conn_bind(struct iscsi_cls_session *cls_session, | |
3180 | struct iscsi_cls_conn *cls_conn, int is_leading) | |
3181 | { | |
75613521 | 3182 | struct iscsi_session *session = cls_session->dd_data; |
98644047 | 3183 | struct iscsi_conn *conn = cls_conn->dd_data; |
7996a778 | 3184 | |
659743b0 | 3185 | spin_lock_bh(&session->frwd_lock); |
7996a778 MC |
3186 | if (is_leading) |
3187 | session->leadconn = conn; | |
659743b0 | 3188 | spin_unlock_bh(&session->frwd_lock); |
7996a778 MC |
3189 | |
3190 | /* | |
3191 | * Unblock xmitworker(), Login Phase will pass through. | |
3192 | */ | |
3193 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
3194 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
3195 | return 0; | |
3196 | } | |
3197 | EXPORT_SYMBOL_GPL(iscsi_conn_bind); | |
3198 | ||
adaf6990 | 3199 | int iscsi_switch_str_param(char **param, char *new_val_buf) |
5700b1af MC |
3200 | { |
3201 | char *new_val; | |
3202 | ||
3203 | if (*param) { | |
3204 | if (!strcmp(*param, new_val_buf)) | |
3205 | return 0; | |
3206 | } | |
3207 | ||
3208 | new_val = kstrdup(new_val_buf, GFP_NOIO); | |
3209 | if (!new_val) | |
3210 | return -ENOMEM; | |
3211 | ||
3212 | kfree(*param); | |
3213 | *param = new_val; | |
3214 | return 0; | |
3215 | } | |
adaf6990 | 3216 | EXPORT_SYMBOL_GPL(iscsi_switch_str_param); |
a54a52ca MC |
3217 | |
3218 | int iscsi_set_param(struct iscsi_cls_conn *cls_conn, | |
3219 | enum iscsi_param param, char *buf, int buflen) | |
3220 | { | |
3221 | struct iscsi_conn *conn = cls_conn->dd_data; | |
3222 | struct iscsi_session *session = conn->session; | |
6a06a4b8 | 3223 | int val; |
a54a52ca MC |
3224 | |
3225 | switch(param) { | |
843c0a8a MC |
3226 | case ISCSI_PARAM_FAST_ABORT: |
3227 | sscanf(buf, "%d", &session->fast_abort); | |
3228 | break; | |
f6d5180c MC |
3229 | case ISCSI_PARAM_ABORT_TMO: |
3230 | sscanf(buf, "%d", &session->abort_timeout); | |
3231 | break; | |
3232 | case ISCSI_PARAM_LU_RESET_TMO: | |
3233 | sscanf(buf, "%d", &session->lu_reset_timeout); | |
3234 | break; | |
3fe5ae8b MC |
3235 | case ISCSI_PARAM_TGT_RESET_TMO: |
3236 | sscanf(buf, "%d", &session->tgt_reset_timeout); | |
3237 | break; | |
f6d5180c MC |
3238 | case ISCSI_PARAM_PING_TMO: |
3239 | sscanf(buf, "%d", &conn->ping_timeout); | |
3240 | break; | |
3241 | case ISCSI_PARAM_RECV_TMO: | |
3242 | sscanf(buf, "%d", &conn->recv_timeout); | |
3243 | break; | |
a54a52ca MC |
3244 | case ISCSI_PARAM_MAX_RECV_DLENGTH: |
3245 | sscanf(buf, "%d", &conn->max_recv_dlength); | |
3246 | break; | |
3247 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
3248 | sscanf(buf, "%d", &conn->max_xmit_dlength); | |
3249 | break; | |
3250 | case ISCSI_PARAM_HDRDGST_EN: | |
3251 | sscanf(buf, "%d", &conn->hdrdgst_en); | |
3252 | break; | |
3253 | case ISCSI_PARAM_DATADGST_EN: | |
3254 | sscanf(buf, "%d", &conn->datadgst_en); | |
3255 | break; | |
3256 | case ISCSI_PARAM_INITIAL_R2T_EN: | |
3257 | sscanf(buf, "%d", &session->initial_r2t_en); | |
3258 | break; | |
3259 | case ISCSI_PARAM_MAX_R2T: | |
1304be5f | 3260 | sscanf(buf, "%hu", &session->max_r2t); |
a54a52ca MC |
3261 | break; |
3262 | case ISCSI_PARAM_IMM_DATA_EN: | |
3263 | sscanf(buf, "%d", &session->imm_data_en); | |
3264 | break; | |
3265 | case ISCSI_PARAM_FIRST_BURST: | |
3266 | sscanf(buf, "%d", &session->first_burst); | |
3267 | break; | |
3268 | case ISCSI_PARAM_MAX_BURST: | |
3269 | sscanf(buf, "%d", &session->max_burst); | |
3270 | break; | |
3271 | case ISCSI_PARAM_PDU_INORDER_EN: | |
3272 | sscanf(buf, "%d", &session->pdu_inorder_en); | |
3273 | break; | |
3274 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
3275 | sscanf(buf, "%d", &session->dataseq_inorder_en); | |
3276 | break; | |
3277 | case ISCSI_PARAM_ERL: | |
3278 | sscanf(buf, "%d", &session->erl); | |
3279 | break; | |
a54a52ca MC |
3280 | case ISCSI_PARAM_EXP_STATSN: |
3281 | sscanf(buf, "%u", &conn->exp_statsn); | |
3282 | break; | |
b2c64167 | 3283 | case ISCSI_PARAM_USERNAME: |
5700b1af | 3284 | return iscsi_switch_str_param(&session->username, buf); |
b2c64167 | 3285 | case ISCSI_PARAM_USERNAME_IN: |
5700b1af | 3286 | return iscsi_switch_str_param(&session->username_in, buf); |
b2c64167 | 3287 | case ISCSI_PARAM_PASSWORD: |
5700b1af | 3288 | return iscsi_switch_str_param(&session->password, buf); |
b2c64167 | 3289 | case ISCSI_PARAM_PASSWORD_IN: |
5700b1af | 3290 | return iscsi_switch_str_param(&session->password_in, buf); |
a54a52ca | 3291 | case ISCSI_PARAM_TARGET_NAME: |
5700b1af | 3292 | return iscsi_switch_str_param(&session->targetname, buf); |
3c5c4801 VC |
3293 | case ISCSI_PARAM_TARGET_ALIAS: |
3294 | return iscsi_switch_str_param(&session->targetalias, buf); | |
a54a52ca MC |
3295 | case ISCSI_PARAM_TPGT: |
3296 | sscanf(buf, "%d", &session->tpgt); | |
3297 | break; | |
3298 | case ISCSI_PARAM_PERSISTENT_PORT: | |
3299 | sscanf(buf, "%d", &conn->persistent_port); | |
3300 | break; | |
3301 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
5700b1af | 3302 | return iscsi_switch_str_param(&conn->persistent_address, buf); |
88dfd340 | 3303 | case ISCSI_PARAM_IFACE_NAME: |
5700b1af | 3304 | return iscsi_switch_str_param(&session->ifacename, buf); |
88dfd340 | 3305 | case ISCSI_PARAM_INITIATOR_NAME: |
5700b1af | 3306 | return iscsi_switch_str_param(&session->initiatorname, buf); |
3b9373e9 EW |
3307 | case ISCSI_PARAM_BOOT_ROOT: |
3308 | return iscsi_switch_str_param(&session->boot_root, buf); | |
3309 | case ISCSI_PARAM_BOOT_NIC: | |
3310 | return iscsi_switch_str_param(&session->boot_nic, buf); | |
3311 | case ISCSI_PARAM_BOOT_TARGET: | |
3312 | return iscsi_switch_str_param(&session->boot_target, buf); | |
f8525eb4 AC |
3313 | case ISCSI_PARAM_PORTAL_TYPE: |
3314 | return iscsi_switch_str_param(&session->portal_type, buf); | |
3315 | case ISCSI_PARAM_DISCOVERY_PARENT_TYPE: | |
3316 | return iscsi_switch_str_param(&session->discovery_parent_type, | |
3317 | buf); | |
6a06a4b8 OG |
3318 | case ISCSI_PARAM_DISCOVERY_SESS: |
3319 | sscanf(buf, "%d", &val); | |
3320 | session->discovery_sess = !!val; | |
3321 | break; | |
ae56ff40 AC |
3322 | case ISCSI_PARAM_LOCAL_IPADDR: |
3323 | return iscsi_switch_str_param(&conn->local_ipaddr, buf); | |
a54a52ca MC |
3324 | default: |
3325 | return -ENOSYS; | |
3326 | } | |
3327 | ||
3328 | return 0; | |
3329 | } | |
3330 | EXPORT_SYMBOL_GPL(iscsi_set_param); | |
3331 | ||
3332 | int iscsi_session_get_param(struct iscsi_cls_session *cls_session, | |
3333 | enum iscsi_param param, char *buf) | |
3334 | { | |
75613521 | 3335 | struct iscsi_session *session = cls_session->dd_data; |
a54a52ca MC |
3336 | int len; |
3337 | ||
3338 | switch(param) { | |
843c0a8a MC |
3339 | case ISCSI_PARAM_FAST_ABORT: |
3340 | len = sprintf(buf, "%d\n", session->fast_abort); | |
3341 | break; | |
f6d5180c MC |
3342 | case ISCSI_PARAM_ABORT_TMO: |
3343 | len = sprintf(buf, "%d\n", session->abort_timeout); | |
3344 | break; | |
3345 | case ISCSI_PARAM_LU_RESET_TMO: | |
3346 | len = sprintf(buf, "%d\n", session->lu_reset_timeout); | |
3347 | break; | |
3fe5ae8b MC |
3348 | case ISCSI_PARAM_TGT_RESET_TMO: |
3349 | len = sprintf(buf, "%d\n", session->tgt_reset_timeout); | |
3350 | break; | |
a54a52ca MC |
3351 | case ISCSI_PARAM_INITIAL_R2T_EN: |
3352 | len = sprintf(buf, "%d\n", session->initial_r2t_en); | |
3353 | break; | |
3354 | case ISCSI_PARAM_MAX_R2T: | |
3355 | len = sprintf(buf, "%hu\n", session->max_r2t); | |
3356 | break; | |
3357 | case ISCSI_PARAM_IMM_DATA_EN: | |
3358 | len = sprintf(buf, "%d\n", session->imm_data_en); | |
3359 | break; | |
3360 | case ISCSI_PARAM_FIRST_BURST: | |
3361 | len = sprintf(buf, "%u\n", session->first_burst); | |
3362 | break; | |
3363 | case ISCSI_PARAM_MAX_BURST: | |
3364 | len = sprintf(buf, "%u\n", session->max_burst); | |
3365 | break; | |
3366 | case ISCSI_PARAM_PDU_INORDER_EN: | |
3367 | len = sprintf(buf, "%d\n", session->pdu_inorder_en); | |
3368 | break; | |
3369 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
3370 | len = sprintf(buf, "%d\n", session->dataseq_inorder_en); | |
3371 | break; | |
5f09e1f3 AC |
3372 | case ISCSI_PARAM_DEF_TASKMGMT_TMO: |
3373 | len = sprintf(buf, "%d\n", session->def_taskmgmt_tmo); | |
3374 | break; | |
a54a52ca MC |
3375 | case ISCSI_PARAM_ERL: |
3376 | len = sprintf(buf, "%d\n", session->erl); | |
3377 | break; | |
3378 | case ISCSI_PARAM_TARGET_NAME: | |
3379 | len = sprintf(buf, "%s\n", session->targetname); | |
3380 | break; | |
3c5c4801 VC |
3381 | case ISCSI_PARAM_TARGET_ALIAS: |
3382 | len = sprintf(buf, "%s\n", session->targetalias); | |
3383 | break; | |
a54a52ca MC |
3384 | case ISCSI_PARAM_TPGT: |
3385 | len = sprintf(buf, "%d\n", session->tpgt); | |
3386 | break; | |
b2c64167 MC |
3387 | case ISCSI_PARAM_USERNAME: |
3388 | len = sprintf(buf, "%s\n", session->username); | |
3389 | break; | |
3390 | case ISCSI_PARAM_USERNAME_IN: | |
3391 | len = sprintf(buf, "%s\n", session->username_in); | |
3392 | break; | |
3393 | case ISCSI_PARAM_PASSWORD: | |
3394 | len = sprintf(buf, "%s\n", session->password); | |
3395 | break; | |
3396 | case ISCSI_PARAM_PASSWORD_IN: | |
3397 | len = sprintf(buf, "%s\n", session->password_in); | |
3398 | break; | |
88dfd340 MC |
3399 | case ISCSI_PARAM_IFACE_NAME: |
3400 | len = sprintf(buf, "%s\n", session->ifacename); | |
3401 | break; | |
3402 | case ISCSI_PARAM_INITIATOR_NAME: | |
5700b1af | 3403 | len = sprintf(buf, "%s\n", session->initiatorname); |
88dfd340 | 3404 | break; |
3b9373e9 EW |
3405 | case ISCSI_PARAM_BOOT_ROOT: |
3406 | len = sprintf(buf, "%s\n", session->boot_root); | |
3407 | break; | |
3408 | case ISCSI_PARAM_BOOT_NIC: | |
3409 | len = sprintf(buf, "%s\n", session->boot_nic); | |
3410 | break; | |
3411 | case ISCSI_PARAM_BOOT_TARGET: | |
3412 | len = sprintf(buf, "%s\n", session->boot_target); | |
9a2307b1 | 3413 | break; |
f8525eb4 AC |
3414 | case ISCSI_PARAM_AUTO_SND_TGT_DISABLE: |
3415 | len = sprintf(buf, "%u\n", session->auto_snd_tgt_disable); | |
3416 | break; | |
3417 | case ISCSI_PARAM_DISCOVERY_SESS: | |
3418 | len = sprintf(buf, "%u\n", session->discovery_sess); | |
3419 | break; | |
3420 | case ISCSI_PARAM_PORTAL_TYPE: | |
3421 | len = sprintf(buf, "%s\n", session->portal_type); | |
3422 | break; | |
3423 | case ISCSI_PARAM_CHAP_AUTH_EN: | |
3424 | len = sprintf(buf, "%u\n", session->chap_auth_en); | |
3425 | break; | |
3426 | case ISCSI_PARAM_DISCOVERY_LOGOUT_EN: | |
3427 | len = sprintf(buf, "%u\n", session->discovery_logout_en); | |
3428 | break; | |
3429 | case ISCSI_PARAM_BIDI_CHAP_EN: | |
3430 | len = sprintf(buf, "%u\n", session->bidi_chap_en); | |
3431 | break; | |
3432 | case ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL: | |
3433 | len = sprintf(buf, "%u\n", session->discovery_auth_optional); | |
3434 | break; | |
3435 | case ISCSI_PARAM_DEF_TIME2WAIT: | |
3436 | len = sprintf(buf, "%d\n", session->time2wait); | |
3437 | break; | |
3438 | case ISCSI_PARAM_DEF_TIME2RETAIN: | |
3439 | len = sprintf(buf, "%d\n", session->time2retain); | |
3440 | break; | |
3441 | case ISCSI_PARAM_TSID: | |
3442 | len = sprintf(buf, "%u\n", session->tsid); | |
3443 | break; | |
3444 | case ISCSI_PARAM_ISID: | |
3445 | len = sprintf(buf, "%02x%02x%02x%02x%02x%02x\n", | |
3446 | session->isid[0], session->isid[1], | |
3447 | session->isid[2], session->isid[3], | |
3448 | session->isid[4], session->isid[5]); | |
3449 | break; | |
3450 | case ISCSI_PARAM_DISCOVERY_PARENT_IDX: | |
3451 | len = sprintf(buf, "%u\n", session->discovery_parent_idx); | |
3452 | break; | |
3453 | case ISCSI_PARAM_DISCOVERY_PARENT_TYPE: | |
3454 | if (session->discovery_parent_type) | |
3455 | len = sprintf(buf, "%s\n", | |
3456 | session->discovery_parent_type); | |
3457 | else | |
3458 | len = sprintf(buf, "\n"); | |
3b9373e9 | 3459 | break; |
a54a52ca MC |
3460 | default: |
3461 | return -ENOSYS; | |
3462 | } | |
3463 | ||
3464 | return len; | |
3465 | } | |
3466 | EXPORT_SYMBOL_GPL(iscsi_session_get_param); | |
3467 | ||
00f3708e MC |
3468 | int iscsi_conn_get_addr_param(struct sockaddr_storage *addr, |
3469 | enum iscsi_param param, char *buf) | |
3470 | { | |
3471 | struct sockaddr_in6 *sin6 = NULL; | |
3472 | struct sockaddr_in *sin = NULL; | |
3473 | int len; | |
3474 | ||
3475 | switch (addr->ss_family) { | |
3476 | case AF_INET: | |
3477 | sin = (struct sockaddr_in *)addr; | |
3478 | break; | |
3479 | case AF_INET6: | |
3480 | sin6 = (struct sockaddr_in6 *)addr; | |
3481 | break; | |
3482 | default: | |
3483 | return -EINVAL; | |
3484 | } | |
3485 | ||
3486 | switch (param) { | |
3487 | case ISCSI_PARAM_CONN_ADDRESS: | |
3488 | case ISCSI_HOST_PARAM_IPADDRESS: | |
3489 | if (sin) | |
3490 | len = sprintf(buf, "%pI4\n", &sin->sin_addr.s_addr); | |
3491 | else | |
3492 | len = sprintf(buf, "%pI6\n", &sin6->sin6_addr); | |
3493 | break; | |
3494 | case ISCSI_PARAM_CONN_PORT: | |
4bfb8ebf | 3495 | case ISCSI_PARAM_LOCAL_PORT: |
00f3708e MC |
3496 | if (sin) |
3497 | len = sprintf(buf, "%hu\n", be16_to_cpu(sin->sin_port)); | |
3498 | else | |
3499 | len = sprintf(buf, "%hu\n", | |
3500 | be16_to_cpu(sin6->sin6_port)); | |
3501 | break; | |
3502 | default: | |
3503 | return -EINVAL; | |
3504 | } | |
3505 | ||
3506 | return len; | |
3507 | } | |
3508 | EXPORT_SYMBOL_GPL(iscsi_conn_get_addr_param); | |
3509 | ||
a54a52ca MC |
3510 | int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn, |
3511 | enum iscsi_param param, char *buf) | |
3512 | { | |
3513 | struct iscsi_conn *conn = cls_conn->dd_data; | |
3514 | int len; | |
3515 | ||
3516 | switch(param) { | |
f6d5180c MC |
3517 | case ISCSI_PARAM_PING_TMO: |
3518 | len = sprintf(buf, "%u\n", conn->ping_timeout); | |
3519 | break; | |
3520 | case ISCSI_PARAM_RECV_TMO: | |
3521 | len = sprintf(buf, "%u\n", conn->recv_timeout); | |
3522 | break; | |
a54a52ca MC |
3523 | case ISCSI_PARAM_MAX_RECV_DLENGTH: |
3524 | len = sprintf(buf, "%u\n", conn->max_recv_dlength); | |
3525 | break; | |
3526 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
3527 | len = sprintf(buf, "%u\n", conn->max_xmit_dlength); | |
3528 | break; | |
3529 | case ISCSI_PARAM_HDRDGST_EN: | |
3530 | len = sprintf(buf, "%d\n", conn->hdrdgst_en); | |
3531 | break; | |
3532 | case ISCSI_PARAM_DATADGST_EN: | |
3533 | len = sprintf(buf, "%d\n", conn->datadgst_en); | |
3534 | break; | |
3535 | case ISCSI_PARAM_IFMARKER_EN: | |
3536 | len = sprintf(buf, "%d\n", conn->ifmarker_en); | |
3537 | break; | |
3538 | case ISCSI_PARAM_OFMARKER_EN: | |
3539 | len = sprintf(buf, "%d\n", conn->ofmarker_en); | |
3540 | break; | |
3541 | case ISCSI_PARAM_EXP_STATSN: | |
3542 | len = sprintf(buf, "%u\n", conn->exp_statsn); | |
3543 | break; | |
3544 | case ISCSI_PARAM_PERSISTENT_PORT: | |
3545 | len = sprintf(buf, "%d\n", conn->persistent_port); | |
3546 | break; | |
3547 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
3548 | len = sprintf(buf, "%s\n", conn->persistent_address); | |
3549 | break; | |
f8525eb4 AC |
3550 | case ISCSI_PARAM_STATSN: |
3551 | len = sprintf(buf, "%u\n", conn->statsn); | |
3552 | break; | |
3553 | case ISCSI_PARAM_MAX_SEGMENT_SIZE: | |
3554 | len = sprintf(buf, "%u\n", conn->max_segment_size); | |
3555 | break; | |
3556 | case ISCSI_PARAM_KEEPALIVE_TMO: | |
3557 | len = sprintf(buf, "%u\n", conn->keepalive_tmo); | |
3558 | break; | |
3559 | case ISCSI_PARAM_LOCAL_PORT: | |
3560 | len = sprintf(buf, "%u\n", conn->local_port); | |
3561 | break; | |
3562 | case ISCSI_PARAM_TCP_TIMESTAMP_STAT: | |
3563 | len = sprintf(buf, "%u\n", conn->tcp_timestamp_stat); | |
3564 | break; | |
3565 | case ISCSI_PARAM_TCP_NAGLE_DISABLE: | |
3566 | len = sprintf(buf, "%u\n", conn->tcp_nagle_disable); | |
3567 | break; | |
3568 | case ISCSI_PARAM_TCP_WSF_DISABLE: | |
3569 | len = sprintf(buf, "%u\n", conn->tcp_wsf_disable); | |
3570 | break; | |
3571 | case ISCSI_PARAM_TCP_TIMER_SCALE: | |
3572 | len = sprintf(buf, "%u\n", conn->tcp_timer_scale); | |
3573 | break; | |
3574 | case ISCSI_PARAM_TCP_TIMESTAMP_EN: | |
3575 | len = sprintf(buf, "%u\n", conn->tcp_timestamp_en); | |
3576 | break; | |
3577 | case ISCSI_PARAM_IP_FRAGMENT_DISABLE: | |
3578 | len = sprintf(buf, "%u\n", conn->fragment_disable); | |
3579 | break; | |
3580 | case ISCSI_PARAM_IPV4_TOS: | |
3581 | len = sprintf(buf, "%u\n", conn->ipv4_tos); | |
3582 | break; | |
3583 | case ISCSI_PARAM_IPV6_TC: | |
3584 | len = sprintf(buf, "%u\n", conn->ipv6_traffic_class); | |
3585 | break; | |
5f09e1f3 AC |
3586 | case ISCSI_PARAM_IPV6_FLOW_LABEL: |
3587 | len = sprintf(buf, "%u\n", conn->ipv6_flow_label); | |
3588 | break; | |
f8525eb4 AC |
3589 | case ISCSI_PARAM_IS_FW_ASSIGNED_IPV6: |
3590 | len = sprintf(buf, "%u\n", conn->is_fw_assigned_ipv6); | |
3591 | break; | |
3592 | case ISCSI_PARAM_TCP_XMIT_WSF: | |
3593 | len = sprintf(buf, "%u\n", conn->tcp_xmit_wsf); | |
3594 | break; | |
3595 | case ISCSI_PARAM_TCP_RECV_WSF: | |
3596 | len = sprintf(buf, "%u\n", conn->tcp_recv_wsf); | |
3597 | break; | |
ae56ff40 AC |
3598 | case ISCSI_PARAM_LOCAL_IPADDR: |
3599 | len = sprintf(buf, "%s\n", conn->local_ipaddr); | |
3600 | break; | |
a54a52ca MC |
3601 | default: |
3602 | return -ENOSYS; | |
3603 | } | |
3604 | ||
3605 | return len; | |
3606 | } | |
3607 | EXPORT_SYMBOL_GPL(iscsi_conn_get_param); | |
3608 | ||
0801c242 MC |
3609 | int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param, |
3610 | char *buf) | |
3611 | { | |
75613521 | 3612 | struct iscsi_host *ihost = shost_priv(shost); |
0801c242 MC |
3613 | int len; |
3614 | ||
3615 | switch (param) { | |
d8196ed2 | 3616 | case ISCSI_HOST_PARAM_NETDEV_NAME: |
5700b1af | 3617 | len = sprintf(buf, "%s\n", ihost->netdev); |
d8196ed2 | 3618 | break; |
0801c242 | 3619 | case ISCSI_HOST_PARAM_HWADDRESS: |
5700b1af | 3620 | len = sprintf(buf, "%s\n", ihost->hwaddress); |
0801c242 | 3621 | break; |
8ad5781a | 3622 | case ISCSI_HOST_PARAM_INITIATOR_NAME: |
5700b1af | 3623 | len = sprintf(buf, "%s\n", ihost->initiatorname); |
8ad5781a | 3624 | break; |
0801c242 MC |
3625 | default: |
3626 | return -ENOSYS; | |
3627 | } | |
3628 | ||
3629 | return len; | |
3630 | } | |
3631 | EXPORT_SYMBOL_GPL(iscsi_host_get_param); | |
3632 | ||
3633 | int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param, | |
3634 | char *buf, int buflen) | |
3635 | { | |
75613521 | 3636 | struct iscsi_host *ihost = shost_priv(shost); |
0801c242 MC |
3637 | |
3638 | switch (param) { | |
d8196ed2 | 3639 | case ISCSI_HOST_PARAM_NETDEV_NAME: |
5700b1af | 3640 | return iscsi_switch_str_param(&ihost->netdev, buf); |
0801c242 | 3641 | case ISCSI_HOST_PARAM_HWADDRESS: |
5700b1af | 3642 | return iscsi_switch_str_param(&ihost->hwaddress, buf); |
8ad5781a | 3643 | case ISCSI_HOST_PARAM_INITIATOR_NAME: |
5700b1af | 3644 | return iscsi_switch_str_param(&ihost->initiatorname, buf); |
0801c242 MC |
3645 | default: |
3646 | return -ENOSYS; | |
3647 | } | |
3648 | ||
3649 | return 0; | |
3650 | } | |
3651 | EXPORT_SYMBOL_GPL(iscsi_host_set_param); | |
3652 | ||
7996a778 MC |
3653 | MODULE_AUTHOR("Mike Christie"); |
3654 | MODULE_DESCRIPTION("iSCSI library functions"); | |
3655 | MODULE_LICENSE("GPL"); |