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