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