Commit | Line | Data |
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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> |
acf3368f | 29 | #include <linux/module.h> |
8eb00539 | 30 | #include <asm/unaligned.h> |
7996a778 MC |
31 | #include <net/tcp.h> |
32 | #include <scsi/scsi_cmnd.h> | |
33 | #include <scsi/scsi_device.h> | |
34 | #include <scsi/scsi_eh.h> | |
35 | #include <scsi/scsi_tcq.h> | |
36 | #include <scsi/scsi_host.h> | |
37 | #include <scsi/scsi.h> | |
38 | #include <scsi/iscsi_proto.h> | |
39 | #include <scsi/scsi_transport.h> | |
40 | #include <scsi/scsi_transport_iscsi.h> | |
41 | #include <scsi/libiscsi.h> | |
42 | ||
bd2199d4 EZ |
43 | static int iscsi_dbg_lib_conn; |
44 | module_param_named(debug_libiscsi_conn, iscsi_dbg_lib_conn, int, | |
45 | S_IRUGO | S_IWUSR); | |
46 | MODULE_PARM_DESC(debug_libiscsi_conn, | |
47 | "Turn on debugging for connections in libiscsi module. " | |
48 | "Set to 1 to turn on, and zero to turn off. Default is off."); | |
49 | ||
50 | static int iscsi_dbg_lib_session; | |
51 | module_param_named(debug_libiscsi_session, iscsi_dbg_lib_session, int, | |
52 | S_IRUGO | S_IWUSR); | |
53 | MODULE_PARM_DESC(debug_libiscsi_session, | |
54 | "Turn on debugging for sessions in libiscsi module. " | |
55 | "Set to 1 to turn on, and zero to turn off. Default is off."); | |
56 | ||
57 | static int iscsi_dbg_lib_eh; | |
58 | module_param_named(debug_libiscsi_eh, iscsi_dbg_lib_eh, int, | |
59 | S_IRUGO | S_IWUSR); | |
60 | MODULE_PARM_DESC(debug_libiscsi_eh, | |
61 | "Turn on debugging for error handling in libiscsi module. " | |
62 | "Set to 1 to turn on, and zero to turn off. Default is off."); | |
1b2c7af8 MC |
63 | |
64 | #define ISCSI_DBG_CONN(_conn, dbg_fmt, arg...) \ | |
65 | do { \ | |
bd2199d4 | 66 | if (iscsi_dbg_lib_conn) \ |
1b2c7af8 MC |
67 | iscsi_conn_printk(KERN_INFO, _conn, \ |
68 | "%s " dbg_fmt, \ | |
69 | __func__, ##arg); \ | |
70 | } while (0); | |
71 | ||
72 | #define ISCSI_DBG_SESSION(_session, dbg_fmt, arg...) \ | |
73 | do { \ | |
bd2199d4 EZ |
74 | if (iscsi_dbg_lib_session) \ |
75 | iscsi_session_printk(KERN_INFO, _session, \ | |
76 | "%s " dbg_fmt, \ | |
77 | __func__, ##arg); \ | |
78 | } while (0); | |
79 | ||
80 | #define ISCSI_DBG_EH(_session, dbg_fmt, arg...) \ | |
81 | do { \ | |
82 | if (iscsi_dbg_lib_eh) \ | |
1b2c7af8 MC |
83 | iscsi_session_printk(KERN_INFO, _session, \ |
84 | "%s " dbg_fmt, \ | |
85 | __func__, ##arg); \ | |
86 | } while (0); | |
87 | ||
32ae763e MC |
88 | inline void iscsi_conn_queue_work(struct iscsi_conn *conn) |
89 | { | |
90 | struct Scsi_Host *shost = conn->session->host; | |
91 | struct iscsi_host *ihost = shost_priv(shost); | |
92 | ||
1336aed1 MC |
93 | if (ihost->workq) |
94 | queue_work(ihost->workq, &conn->xmitwork); | |
32ae763e MC |
95 | } |
96 | EXPORT_SYMBOL_GPL(iscsi_conn_queue_work); | |
97 | ||
4c0ba5d2 MC |
98 | static void __iscsi_update_cmdsn(struct iscsi_session *session, |
99 | uint32_t exp_cmdsn, uint32_t max_cmdsn) | |
7996a778 | 100 | { |
77a23c21 MC |
101 | /* |
102 | * standard specifies this check for when to update expected and | |
103 | * max sequence numbers | |
104 | */ | |
105 | if (iscsi_sna_lt(max_cmdsn, exp_cmdsn - 1)) | |
106 | return; | |
107 | ||
108 | if (exp_cmdsn != session->exp_cmdsn && | |
109 | !iscsi_sna_lt(exp_cmdsn, session->exp_cmdsn)) | |
7996a778 MC |
110 | session->exp_cmdsn = exp_cmdsn; |
111 | ||
77a23c21 | 112 | if (max_cmdsn != session->max_cmdsn && |
46a84c65 | 113 | !iscsi_sna_lt(max_cmdsn, session->max_cmdsn)) |
77a23c21 | 114 | session->max_cmdsn = max_cmdsn; |
7996a778 | 115 | } |
4c0ba5d2 MC |
116 | |
117 | void iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr) | |
118 | { | |
119 | __iscsi_update_cmdsn(session, be32_to_cpu(hdr->exp_cmdsn), | |
120 | be32_to_cpu(hdr->max_cmdsn)); | |
121 | } | |
77a23c21 | 122 | EXPORT_SYMBOL_GPL(iscsi_update_cmdsn); |
7996a778 | 123 | |
577577da MC |
124 | /** |
125 | * iscsi_prep_data_out_pdu - initialize Data-Out | |
126 | * @task: scsi command task | |
127 | * @r2t: R2T info | |
128 | * @hdr: iscsi data in pdu | |
129 | * | |
130 | * Notes: | |
131 | * Initialize Data-Out within this R2T sequence and finds | |
132 | * proper data_offset within this SCSI command. | |
133 | * | |
134 | * This function is called with connection lock taken. | |
135 | **/ | |
136 | void iscsi_prep_data_out_pdu(struct iscsi_task *task, struct iscsi_r2t_info *r2t, | |
137 | struct iscsi_data *hdr) | |
7996a778 | 138 | { |
9c19a7d0 | 139 | struct iscsi_conn *conn = task->conn; |
577577da MC |
140 | unsigned int left = r2t->data_length - r2t->sent; |
141 | ||
142 | task->hdr_len = sizeof(struct iscsi_data); | |
7996a778 MC |
143 | |
144 | memset(hdr, 0, sizeof(struct iscsi_data)); | |
577577da MC |
145 | hdr->ttt = r2t->ttt; |
146 | hdr->datasn = cpu_to_be32(r2t->datasn); | |
147 | r2t->datasn++; | |
7996a778 | 148 | hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; |
55bdabdf | 149 | hdr->lun = task->lun; |
577577da MC |
150 | hdr->itt = task->hdr_itt; |
151 | hdr->exp_statsn = r2t->exp_statsn; | |
152 | hdr->offset = cpu_to_be32(r2t->data_offset + r2t->sent); | |
153 | if (left > conn->max_xmit_dlength) { | |
7996a778 | 154 | hton24(hdr->dlength, conn->max_xmit_dlength); |
577577da | 155 | r2t->data_count = conn->max_xmit_dlength; |
7996a778 MC |
156 | hdr->flags = 0; |
157 | } else { | |
577577da MC |
158 | hton24(hdr->dlength, left); |
159 | r2t->data_count = left; | |
7996a778 MC |
160 | hdr->flags = ISCSI_FLAG_CMD_FINAL; |
161 | } | |
577577da | 162 | conn->dataout_pdus_cnt++; |
7996a778 | 163 | } |
577577da | 164 | EXPORT_SYMBOL_GPL(iscsi_prep_data_out_pdu); |
7996a778 | 165 | |
9c19a7d0 | 166 | static int iscsi_add_hdr(struct iscsi_task *task, unsigned len) |
004d6530 | 167 | { |
9c19a7d0 | 168 | unsigned exp_len = task->hdr_len + len; |
004d6530 | 169 | |
9c19a7d0 | 170 | if (exp_len > task->hdr_max) { |
004d6530 BH |
171 | WARN_ON(1); |
172 | return -EINVAL; | |
173 | } | |
174 | ||
175 | WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */ | |
9c19a7d0 | 176 | task->hdr_len = exp_len; |
004d6530 BH |
177 | return 0; |
178 | } | |
179 | ||
38d1c069 BH |
180 | /* |
181 | * make an extended cdb AHS | |
182 | */ | |
9c19a7d0 | 183 | static int iscsi_prep_ecdb_ahs(struct iscsi_task *task) |
38d1c069 | 184 | { |
9c19a7d0 | 185 | struct scsi_cmnd *cmd = task->sc; |
38d1c069 BH |
186 | unsigned rlen, pad_len; |
187 | unsigned short ahslength; | |
188 | struct iscsi_ecdb_ahdr *ecdb_ahdr; | |
189 | int rc; | |
190 | ||
9c19a7d0 | 191 | ecdb_ahdr = iscsi_next_hdr(task); |
38d1c069 BH |
192 | rlen = cmd->cmd_len - ISCSI_CDB_SIZE; |
193 | ||
194 | BUG_ON(rlen > sizeof(ecdb_ahdr->ecdb)); | |
195 | ahslength = rlen + sizeof(ecdb_ahdr->reserved); | |
196 | ||
197 | pad_len = iscsi_padding(rlen); | |
198 | ||
9c19a7d0 | 199 | rc = iscsi_add_hdr(task, sizeof(ecdb_ahdr->ahslength) + |
38d1c069 BH |
200 | sizeof(ecdb_ahdr->ahstype) + ahslength + pad_len); |
201 | if (rc) | |
202 | return rc; | |
203 | ||
204 | if (pad_len) | |
205 | memset(&ecdb_ahdr->ecdb[rlen], 0, pad_len); | |
206 | ||
207 | ecdb_ahdr->ahslength = cpu_to_be16(ahslength); | |
208 | ecdb_ahdr->ahstype = ISCSI_AHSTYPE_CDB; | |
209 | ecdb_ahdr->reserved = 0; | |
210 | memcpy(ecdb_ahdr->ecdb, cmd->cmnd + ISCSI_CDB_SIZE, rlen); | |
211 | ||
1b2c7af8 MC |
212 | ISCSI_DBG_SESSION(task->conn->session, |
213 | "iscsi_prep_ecdb_ahs: varlen_cdb_len %d " | |
214 | "rlen %d pad_len %d ahs_length %d iscsi_headers_size " | |
215 | "%u\n", cmd->cmd_len, rlen, pad_len, ahslength, | |
216 | task->hdr_len); | |
38d1c069 BH |
217 | return 0; |
218 | } | |
219 | ||
9c19a7d0 | 220 | static int iscsi_prep_bidi_ahs(struct iscsi_task *task) |
c07d4444 | 221 | { |
9c19a7d0 | 222 | struct scsi_cmnd *sc = task->sc; |
c07d4444 BH |
223 | struct iscsi_rlength_ahdr *rlen_ahdr; |
224 | int rc; | |
225 | ||
9c19a7d0 MC |
226 | rlen_ahdr = iscsi_next_hdr(task); |
227 | rc = iscsi_add_hdr(task, sizeof(*rlen_ahdr)); | |
c07d4444 BH |
228 | if (rc) |
229 | return rc; | |
230 | ||
231 | rlen_ahdr->ahslength = | |
232 | cpu_to_be16(sizeof(rlen_ahdr->read_length) + | |
233 | sizeof(rlen_ahdr->reserved)); | |
234 | rlen_ahdr->ahstype = ISCSI_AHSTYPE_RLENGTH; | |
235 | rlen_ahdr->reserved = 0; | |
236 | rlen_ahdr->read_length = cpu_to_be32(scsi_in(sc)->length); | |
237 | ||
1b2c7af8 MC |
238 | ISCSI_DBG_SESSION(task->conn->session, |
239 | "bidi-in rlen_ahdr->read_length(%d) " | |
240 | "rlen_ahdr->ahslength(%d)\n", | |
241 | be32_to_cpu(rlen_ahdr->read_length), | |
242 | be16_to_cpu(rlen_ahdr->ahslength)); | |
c07d4444 BH |
243 | return 0; |
244 | } | |
245 | ||
5d12c05e MC |
246 | /** |
247 | * iscsi_check_tmf_restrictions - check if a task is affected by TMF | |
248 | * @task: iscsi task | |
249 | * @opcode: opcode to check for | |
250 | * | |
251 | * During TMF a task has to be checked if it's affected. | |
252 | * All unrelated I/O can be passed through, but I/O to the | |
253 | * affected LUN should be restricted. | |
254 | * If 'fast_abort' is set we won't be sending any I/O to the | |
255 | * affected LUN. | |
256 | * Otherwise the target is waiting for all TTTs to be completed, | |
257 | * so we have to send all outstanding Data-Out PDUs to the target. | |
258 | */ | |
259 | static int iscsi_check_tmf_restrictions(struct iscsi_task *task, int opcode) | |
260 | { | |
261 | struct iscsi_conn *conn = task->conn; | |
262 | struct iscsi_tm *tmf = &conn->tmhdr; | |
9cb78c16 | 263 | u64 hdr_lun; |
5d12c05e MC |
264 | |
265 | if (conn->tmf_state == TMF_INITIAL) | |
266 | return 0; | |
267 | ||
268 | if ((tmf->opcode & ISCSI_OPCODE_MASK) != ISCSI_OP_SCSI_TMFUNC) | |
269 | return 0; | |
270 | ||
271 | switch (ISCSI_TM_FUNC_VALUE(tmf)) { | |
272 | case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: | |
273 | /* | |
274 | * Allow PDUs for unrelated LUNs | |
275 | */ | |
55bdabdf | 276 | hdr_lun = scsilun_to_int(&tmf->lun); |
5d12c05e MC |
277 | if (hdr_lun != task->sc->device->lun) |
278 | return 0; | |
3fe5ae8b MC |
279 | /* fall through */ |
280 | case ISCSI_TM_FUNC_TARGET_WARM_RESET: | |
5d12c05e MC |
281 | /* |
282 | * Fail all SCSI cmd PDUs | |
283 | */ | |
284 | if (opcode != ISCSI_OP_SCSI_DATA_OUT) { | |
285 | iscsi_conn_printk(KERN_INFO, conn, | |
286 | "task [op %x/%x itt " | |
3fe5ae8b | 287 | "0x%x/0x%x] " |
5d12c05e MC |
288 | "rejected.\n", |
289 | task->hdr->opcode, opcode, | |
3fe5ae8b | 290 | task->itt, task->hdr_itt); |
5d12c05e MC |
291 | return -EACCES; |
292 | } | |
293 | /* | |
294 | * And also all data-out PDUs in response to R2T | |
295 | * if fast_abort is set. | |
296 | */ | |
297 | if (conn->session->fast_abort) { | |
298 | iscsi_conn_printk(KERN_INFO, conn, | |
299 | "task [op %x/%x itt " | |
3fe5ae8b | 300 | "0x%x/0x%x] fast abort.\n", |
5d12c05e | 301 | task->hdr->opcode, opcode, |
3fe5ae8b | 302 | task->itt, task->hdr_itt); |
5d12c05e MC |
303 | return -EACCES; |
304 | } | |
305 | break; | |
306 | case ISCSI_TM_FUNC_ABORT_TASK: | |
307 | /* | |
308 | * the caller has already checked if the task | |
309 | * they want to abort was in the pending queue so if | |
310 | * we are here the cmd pdu has gone out already, and | |
311 | * we will only hit this for data-outs | |
312 | */ | |
313 | if (opcode == ISCSI_OP_SCSI_DATA_OUT && | |
314 | task->hdr_itt == tmf->rtt) { | |
315 | ISCSI_DBG_SESSION(conn->session, | |
316 | "Preventing task %x/%x from sending " | |
317 | "data-out due to abort task in " | |
318 | "progress\n", task->itt, | |
319 | task->hdr_itt); | |
320 | return -EACCES; | |
321 | } | |
322 | break; | |
323 | } | |
324 | ||
325 | return 0; | |
326 | } | |
327 | ||
7996a778 MC |
328 | /** |
329 | * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu | |
9c19a7d0 | 330 | * @task: iscsi task |
7996a778 MC |
331 | * |
332 | * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set | |
333 | * fields like dlength or final based on how much data it sends | |
334 | */ | |
9c19a7d0 | 335 | static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task) |
7996a778 | 336 | { |
9c19a7d0 | 337 | struct iscsi_conn *conn = task->conn; |
7996a778 | 338 | struct iscsi_session *session = conn->session; |
9c19a7d0 | 339 | struct scsi_cmnd *sc = task->sc; |
12352183 | 340 | struct iscsi_scsi_req *hdr; |
d77e6535 | 341 | unsigned hdrlength, cmd_len, transfer_length; |
262ef636 | 342 | itt_t itt; |
004d6530 | 343 | int rc; |
7996a778 | 344 | |
5d12c05e MC |
345 | rc = iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_CMD); |
346 | if (rc) | |
347 | return rc; | |
348 | ||
184b57c6 MC |
349 | if (conn->session->tt->alloc_pdu) { |
350 | rc = conn->session->tt->alloc_pdu(task, ISCSI_OP_SCSI_CMD); | |
351 | if (rc) | |
352 | return rc; | |
353 | } | |
12352183 | 354 | hdr = (struct iscsi_scsi_req *)task->hdr; |
262ef636 | 355 | itt = hdr->itt; |
577577da MC |
356 | memset(hdr, 0, sizeof(*hdr)); |
357 | ||
2ff79d52 MC |
358 | if (session->tt->parse_pdu_itt) |
359 | hdr->itt = task->hdr_itt = itt; | |
360 | else | |
361 | hdr->itt = task->hdr_itt = build_itt(task->itt, | |
362 | task->conn->session->age); | |
9c19a7d0 MC |
363 | task->hdr_len = 0; |
364 | rc = iscsi_add_hdr(task, sizeof(*hdr)); | |
004d6530 BH |
365 | if (rc) |
366 | return rc; | |
a8ac6311 OK |
367 | hdr->opcode = ISCSI_OP_SCSI_CMD; |
368 | hdr->flags = ISCSI_ATTR_SIMPLE; | |
55bdabdf AG |
369 | int_to_scsilun(sc->device->lun, &hdr->lun); |
370 | task->lun = hdr->lun; | |
a8ac6311 | 371 | hdr->exp_statsn = cpu_to_be32(conn->exp_statsn); |
38d1c069 BH |
372 | cmd_len = sc->cmd_len; |
373 | if (cmd_len < ISCSI_CDB_SIZE) | |
374 | memset(&hdr->cdb[cmd_len], 0, ISCSI_CDB_SIZE - cmd_len); | |
375 | else if (cmd_len > ISCSI_CDB_SIZE) { | |
9c19a7d0 | 376 | rc = iscsi_prep_ecdb_ahs(task); |
38d1c069 BH |
377 | if (rc) |
378 | return rc; | |
379 | cmd_len = ISCSI_CDB_SIZE; | |
380 | } | |
381 | memcpy(hdr->cdb, sc->cmnd, cmd_len); | |
7996a778 | 382 | |
9c19a7d0 | 383 | task->imm_count = 0; |
c07d4444 BH |
384 | if (scsi_bidi_cmnd(sc)) { |
385 | hdr->flags |= ISCSI_FLAG_CMD_READ; | |
9c19a7d0 | 386 | rc = iscsi_prep_bidi_ahs(task); |
c07d4444 BH |
387 | if (rc) |
388 | return rc; | |
389 | } | |
55e51eda SG |
390 | |
391 | if (scsi_get_prot_op(sc) != SCSI_PROT_NORMAL) | |
392 | task->protected = true; | |
393 | ||
d77e6535 SG |
394 | transfer_length = scsi_transfer_length(sc); |
395 | hdr->data_length = cpu_to_be32(transfer_length); | |
7996a778 | 396 | if (sc->sc_data_direction == DMA_TO_DEVICE) { |
577577da MC |
397 | struct iscsi_r2t_info *r2t = &task->unsol_r2t; |
398 | ||
7996a778 MC |
399 | hdr->flags |= ISCSI_FLAG_CMD_WRITE; |
400 | /* | |
401 | * Write counters: | |
402 | * | |
403 | * imm_count bytes to be sent right after | |
404 | * SCSI PDU Header | |
405 | * | |
406 | * unsol_count bytes(as Data-Out) to be sent | |
407 | * without R2T ack right after | |
408 | * immediate data | |
409 | * | |
577577da | 410 | * r2t data_length bytes to be sent via R2T ack's |
7996a778 MC |
411 | * |
412 | * pad_count bytes to be sent as zero-padding | |
413 | */ | |
577577da | 414 | memset(r2t, 0, sizeof(*r2t)); |
7996a778 MC |
415 | |
416 | if (session->imm_data_en) { | |
d77e6535 | 417 | if (transfer_length >= session->first_burst) |
9c19a7d0 | 418 | task->imm_count = min(session->first_burst, |
7996a778 MC |
419 | conn->max_xmit_dlength); |
420 | else | |
d77e6535 SG |
421 | task->imm_count = min(transfer_length, |
422 | conn->max_xmit_dlength); | |
9c19a7d0 | 423 | hton24(hdr->dlength, task->imm_count); |
7996a778 | 424 | } else |
a8ac6311 | 425 | zero_data(hdr->dlength); |
7996a778 | 426 | |
ffd0436e | 427 | if (!session->initial_r2t_en) { |
d77e6535 SG |
428 | r2t->data_length = min(session->first_burst, |
429 | transfer_length) - | |
577577da MC |
430 | task->imm_count; |
431 | r2t->data_offset = task->imm_count; | |
432 | r2t->ttt = cpu_to_be32(ISCSI_RESERVED_TAG); | |
433 | r2t->exp_statsn = cpu_to_be32(conn->exp_statsn); | |
ffd0436e MC |
434 | } |
435 | ||
577577da | 436 | if (!task->unsol_r2t.data_length) |
7996a778 | 437 | /* No unsolicit Data-Out's */ |
a8ac6311 | 438 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; |
7996a778 | 439 | } else { |
7996a778 MC |
440 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; |
441 | zero_data(hdr->dlength); | |
442 | ||
443 | if (sc->sc_data_direction == DMA_FROM_DEVICE) | |
444 | hdr->flags |= ISCSI_FLAG_CMD_READ; | |
445 | } | |
446 | ||
004d6530 | 447 | /* calculate size of additional header segments (AHSs) */ |
9c19a7d0 | 448 | hdrlength = task->hdr_len - sizeof(*hdr); |
004d6530 BH |
449 | |
450 | WARN_ON(hdrlength & (ISCSI_PAD_LEN-1)); | |
451 | hdrlength /= ISCSI_PAD_LEN; | |
452 | ||
453 | WARN_ON(hdrlength >= 256); | |
454 | hdr->hlength = hdrlength & 0xFF; | |
96b1f96d | 455 | hdr->cmdsn = task->cmdsn = cpu_to_be32(session->cmdsn); |
004d6530 | 456 | |
577577da | 457 | if (session->tt->init_task && session->tt->init_task(task)) |
052d0144 MC |
458 | return -EIO; |
459 | ||
9c19a7d0 | 460 | task->state = ISCSI_TASK_RUNNING; |
d3305f34 | 461 | session->cmdsn++; |
77a23c21 | 462 | |
a8ac6311 | 463 | conn->scsicmd_pdus_cnt++; |
1b2c7af8 MC |
464 | ISCSI_DBG_SESSION(session, "iscsi prep [%s cid %d sc %p cdb 0x%x " |
465 | "itt 0x%x len %d bidi_len %d cmdsn %d win %d]\n", | |
466 | scsi_bidi_cmnd(sc) ? "bidirectional" : | |
467 | sc->sc_data_direction == DMA_TO_DEVICE ? | |
468 | "write" : "read", conn->id, sc, sc->cmnd[0], | |
d77e6535 | 469 | task->itt, transfer_length, |
1b2c7af8 MC |
470 | scsi_bidi_cmnd(sc) ? scsi_in(sc)->length : 0, |
471 | session->cmdsn, | |
472 | session->max_cmdsn - session->exp_cmdsn + 1); | |
004d6530 | 473 | return 0; |
7996a778 | 474 | } |
7996a778 MC |
475 | |
476 | /** | |
3bbaaad9 | 477 | * iscsi_free_task - free a task |
9c19a7d0 | 478 | * @task: iscsi cmd task |
7996a778 | 479 | * |
659743b0 | 480 | * Must be called with session back_lock. |
3e5c28ad MC |
481 | * This function returns the scsi command to scsi-ml or cleans |
482 | * up mgmt tasks then returns the task to the pool. | |
7996a778 | 483 | */ |
3bbaaad9 | 484 | static void iscsi_free_task(struct iscsi_task *task) |
7996a778 | 485 | { |
9c19a7d0 | 486 | struct iscsi_conn *conn = task->conn; |
c1635cb7 | 487 | struct iscsi_session *session = conn->session; |
9c19a7d0 | 488 | struct scsi_cmnd *sc = task->sc; |
f41d4721 | 489 | int oldstate = task->state; |
7996a778 | 490 | |
4421c9eb MC |
491 | ISCSI_DBG_SESSION(session, "freeing task itt 0x%x state %d sc %p\n", |
492 | task->itt, task->state, task->sc); | |
493 | ||
577577da | 494 | session->tt->cleanup_task(task); |
3bbaaad9 | 495 | task->state = ISCSI_TASK_FREE; |
9c19a7d0 | 496 | task->sc = NULL; |
3e5c28ad | 497 | /* |
9c19a7d0 | 498 | * login task is preallocated so do not free |
3e5c28ad | 499 | */ |
9c19a7d0 | 500 | if (conn->login_task == task) |
3e5c28ad MC |
501 | return; |
502 | ||
7acd72eb | 503 | kfifo_in(&session->cmdpool.queue, (void*)&task, sizeof(void*)); |
052d0144 | 504 | |
3e5c28ad | 505 | if (sc) { |
3e5c28ad MC |
506 | /* SCSI eh reuses commands to verify us */ |
507 | sc->SCp.ptr = NULL; | |
508 | /* | |
f41d4721 MC |
509 | * queue command may call this to free the task, so |
510 | * it will decide how to return sc to scsi-ml. | |
3e5c28ad | 511 | */ |
f41d4721 | 512 | if (oldstate != ISCSI_TASK_REQUEUE_SCSIQ) |
3e5c28ad MC |
513 | sc->scsi_done(sc); |
514 | } | |
7996a778 MC |
515 | } |
516 | ||
913e5bf4 | 517 | void __iscsi_get_task(struct iscsi_task *task) |
60ecebf5 | 518 | { |
9c19a7d0 | 519 | atomic_inc(&task->refcount); |
60ecebf5 | 520 | } |
913e5bf4 | 521 | EXPORT_SYMBOL_GPL(__iscsi_get_task); |
60ecebf5 | 522 | |
8eea2f55 | 523 | void __iscsi_put_task(struct iscsi_task *task) |
60ecebf5 | 524 | { |
9c19a7d0 | 525 | if (atomic_dec_and_test(&task->refcount)) |
3bbaaad9 | 526 | iscsi_free_task(task); |
60ecebf5 | 527 | } |
8eea2f55 | 528 | EXPORT_SYMBOL_GPL(__iscsi_put_task); |
60ecebf5 | 529 | |
9c19a7d0 | 530 | void iscsi_put_task(struct iscsi_task *task) |
3e5c28ad | 531 | { |
9c19a7d0 | 532 | struct iscsi_session *session = task->conn->session; |
3e5c28ad | 533 | |
659743b0 SP |
534 | /* regular RX path uses back_lock */ |
535 | spin_lock_bh(&session->back_lock); | |
9c19a7d0 | 536 | __iscsi_put_task(task); |
659743b0 | 537 | spin_unlock_bh(&session->back_lock); |
3e5c28ad | 538 | } |
9c19a7d0 | 539 | EXPORT_SYMBOL_GPL(iscsi_put_task); |
3e5c28ad | 540 | |
3bbaaad9 MC |
541 | /** |
542 | * iscsi_complete_task - finish a task | |
543 | * @task: iscsi cmd task | |
b3cd5050 | 544 | * @state: state to complete task with |
3bbaaad9 | 545 | * |
659743b0 | 546 | * Must be called with session back_lock. |
3bbaaad9 | 547 | */ |
b3cd5050 | 548 | static void iscsi_complete_task(struct iscsi_task *task, int state) |
3bbaaad9 MC |
549 | { |
550 | struct iscsi_conn *conn = task->conn; | |
551 | ||
4421c9eb MC |
552 | ISCSI_DBG_SESSION(conn->session, |
553 | "complete task itt 0x%x state %d sc %p\n", | |
554 | task->itt, task->state, task->sc); | |
b3cd5050 MC |
555 | if (task->state == ISCSI_TASK_COMPLETED || |
556 | task->state == ISCSI_TASK_ABRT_TMF || | |
f41d4721 MC |
557 | task->state == ISCSI_TASK_ABRT_SESS_RECOV || |
558 | task->state == ISCSI_TASK_REQUEUE_SCSIQ) | |
3bbaaad9 MC |
559 | return; |
560 | WARN_ON_ONCE(task->state == ISCSI_TASK_FREE); | |
b3cd5050 | 561 | task->state = state; |
3bbaaad9 MC |
562 | |
563 | if (!list_empty(&task->running)) | |
564 | list_del_init(&task->running); | |
565 | ||
566 | if (conn->task == task) | |
567 | conn->task = NULL; | |
568 | ||
569 | if (conn->ping_task == task) | |
570 | conn->ping_task = NULL; | |
571 | ||
572 | /* release get from queueing */ | |
573 | __iscsi_put_task(task); | |
574 | } | |
575 | ||
4c0ba5d2 MC |
576 | /** |
577 | * iscsi_complete_scsi_task - finish scsi task normally | |
578 | * @task: iscsi task for scsi cmd | |
579 | * @exp_cmdsn: expected cmd sn in cpu format | |
580 | * @max_cmdsn: max cmd sn in cpu format | |
581 | * | |
582 | * This is used when drivers do not need or cannot perform | |
583 | * lower level pdu processing. | |
584 | * | |
659743b0 | 585 | * Called with session back_lock |
4c0ba5d2 MC |
586 | */ |
587 | void iscsi_complete_scsi_task(struct iscsi_task *task, | |
588 | uint32_t exp_cmdsn, uint32_t max_cmdsn) | |
589 | { | |
590 | struct iscsi_conn *conn = task->conn; | |
591 | ||
592 | ISCSI_DBG_SESSION(conn->session, "[itt 0x%x]\n", task->itt); | |
593 | ||
594 | conn->last_recv = jiffies; | |
595 | __iscsi_update_cmdsn(conn->session, exp_cmdsn, max_cmdsn); | |
596 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); | |
597 | } | |
598 | EXPORT_SYMBOL_GPL(iscsi_complete_scsi_task); | |
599 | ||
600 | ||
b3a7ea8d | 601 | /* |
659743b0 | 602 | * session back_lock must be held and if not called for a task that is |
3bbaaad9 MC |
603 | * still pending or from the xmit thread, then xmit thread must |
604 | * be suspended. | |
b3a7ea8d | 605 | */ |
3bbaaad9 | 606 | static void fail_scsi_task(struct iscsi_task *task, int err) |
b3a7ea8d | 607 | { |
3bbaaad9 | 608 | struct iscsi_conn *conn = task->conn; |
b3a7ea8d | 609 | struct scsi_cmnd *sc; |
b3cd5050 | 610 | int state; |
b3a7ea8d | 611 | |
3bbaaad9 MC |
612 | /* |
613 | * if a command completes and we get a successful tmf response | |
614 | * we will hit this because the scsi eh abort code does not take | |
615 | * a ref to the task. | |
616 | */ | |
9c19a7d0 | 617 | sc = task->sc; |
b3a7ea8d MC |
618 | if (!sc) |
619 | return; | |
620 | ||
b3cd5050 | 621 | if (task->state == ISCSI_TASK_PENDING) { |
b3a7ea8d MC |
622 | /* |
623 | * cmd never made it to the xmit thread, so we should not count | |
624 | * the cmd in the sequencing | |
625 | */ | |
626 | conn->session->queued_cmdsn--; | |
b3cd5050 MC |
627 | /* it was never sent so just complete like normal */ |
628 | state = ISCSI_TASK_COMPLETED; | |
629 | } else if (err == DID_TRANSPORT_DISRUPTED) | |
630 | state = ISCSI_TASK_ABRT_SESS_RECOV; | |
631 | else | |
632 | state = ISCSI_TASK_ABRT_TMF; | |
b3a7ea8d | 633 | |
b3cd5050 | 634 | sc->result = err << 16; |
c07d4444 BH |
635 | if (!scsi_bidi_cmnd(sc)) |
636 | scsi_set_resid(sc, scsi_bufflen(sc)); | |
637 | else { | |
638 | scsi_out(sc)->resid = scsi_out(sc)->length; | |
639 | scsi_in(sc)->resid = scsi_in(sc)->length; | |
640 | } | |
3e5c28ad | 641 | |
659743b0 SP |
642 | /* regular RX path uses back_lock */ |
643 | spin_lock_bh(&conn->session->back_lock); | |
b3cd5050 | 644 | iscsi_complete_task(task, state); |
659743b0 | 645 | spin_unlock_bh(&conn->session->back_lock); |
b3a7ea8d MC |
646 | } |
647 | ||
3e5c28ad | 648 | static int iscsi_prep_mgmt_task(struct iscsi_conn *conn, |
9c19a7d0 | 649 | struct iscsi_task *task) |
052d0144 MC |
650 | { |
651 | struct iscsi_session *session = conn->session; | |
577577da | 652 | struct iscsi_hdr *hdr = task->hdr; |
052d0144 | 653 | struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr; |
4f704dc0 | 654 | uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK; |
052d0144 MC |
655 | |
656 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) | |
657 | return -ENOTCONN; | |
658 | ||
4f704dc0 | 659 | if (opcode != ISCSI_OP_LOGIN && opcode != ISCSI_OP_TEXT) |
052d0144 MC |
660 | nop->exp_statsn = cpu_to_be32(conn->exp_statsn); |
661 | /* | |
662 | * pre-format CmdSN for outgoing PDU. | |
663 | */ | |
664 | nop->cmdsn = cpu_to_be32(session->cmdsn); | |
665 | if (hdr->itt != RESERVED_ITT) { | |
052d0144 | 666 | /* |
4f704dc0 | 667 | * TODO: We always use immediate for normal session pdus. |
052d0144 MC |
668 | * If we start to send tmfs or nops as non-immediate then |
669 | * we should start checking the cmdsn numbers for mgmt tasks. | |
4f704dc0 MC |
670 | * |
671 | * During discovery sessions iscsid sends TEXT as non immediate, | |
672 | * but we always only send one PDU at a time. | |
052d0144 MC |
673 | */ |
674 | if (conn->c_stage == ISCSI_CONN_STARTED && | |
675 | !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { | |
676 | session->queued_cmdsn++; | |
677 | session->cmdsn++; | |
678 | } | |
679 | } | |
680 | ||
ae15f801 MC |
681 | if (session->tt->init_task && session->tt->init_task(task)) |
682 | return -EIO; | |
052d0144 MC |
683 | |
684 | if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT) | |
685 | session->state = ISCSI_STATE_LOGGING_OUT; | |
686 | ||
577577da | 687 | task->state = ISCSI_TASK_RUNNING; |
1b2c7af8 MC |
688 | ISCSI_DBG_SESSION(session, "mgmtpdu [op 0x%x hdr->itt 0x%x " |
689 | "datalen %d]\n", hdr->opcode & ISCSI_OPCODE_MASK, | |
690 | hdr->itt, task->data_count); | |
052d0144 MC |
691 | return 0; |
692 | } | |
693 | ||
9c19a7d0 | 694 | static struct iscsi_task * |
f6d5180c MC |
695 | __iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
696 | char *data, uint32_t data_size) | |
697 | { | |
698 | struct iscsi_session *session = conn->session; | |
1336aed1 | 699 | struct iscsi_host *ihost = shost_priv(session->host); |
4f704dc0 | 700 | uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK; |
9c19a7d0 | 701 | struct iscsi_task *task; |
262ef636 | 702 | itt_t itt; |
f6d5180c MC |
703 | |
704 | if (session->state == ISCSI_STATE_TERMINATE) | |
705 | return NULL; | |
706 | ||
4f704dc0 | 707 | if (opcode == ISCSI_OP_LOGIN || opcode == ISCSI_OP_TEXT) { |
f6d5180c MC |
708 | /* |
709 | * Login and Text are sent serially, in | |
710 | * request-followed-by-response sequence. | |
3e5c28ad MC |
711 | * Same task can be used. Same ITT must be used. |
712 | * Note that login_task is preallocated at conn_create(). | |
f6d5180c | 713 | */ |
4f704dc0 MC |
714 | if (conn->login_task->state != ISCSI_TASK_FREE) { |
715 | iscsi_conn_printk(KERN_ERR, conn, "Login/Text in " | |
716 | "progress. Cannot start new task.\n"); | |
717 | return NULL; | |
718 | } | |
719 | ||
cbaa4221 MC |
720 | if (data_size > ISCSI_DEF_MAX_RECV_SEG_LEN) { |
721 | 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); | |
722 | return NULL; | |
723 | } | |
724 | ||
9c19a7d0 | 725 | task = conn->login_task; |
4f704dc0 | 726 | } else { |
26013ad4 MC |
727 | if (session->state != ISCSI_STATE_LOGGED_IN) |
728 | return NULL; | |
729 | ||
cbaa4221 MC |
730 | if (data_size != 0) { |
731 | iscsi_conn_printk(KERN_ERR, conn, "Can not send data buffer of len %u for op 0x%x\n", data_size, opcode); | |
732 | return NULL; | |
733 | } | |
734 | ||
f6d5180c MC |
735 | BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE); |
736 | BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED); | |
737 | ||
7acd72eb | 738 | if (!kfifo_out(&session->cmdpool.queue, |
9c19a7d0 | 739 | (void*)&task, sizeof(void*))) |
f6d5180c MC |
740 | return NULL; |
741 | } | |
3e5c28ad MC |
742 | /* |
743 | * released in complete pdu for task we expect a response for, and | |
744 | * released by the lld when it has transmitted the task for | |
745 | * pdus we do not expect a response for. | |
746 | */ | |
9c19a7d0 MC |
747 | atomic_set(&task->refcount, 1); |
748 | task->conn = conn; | |
749 | task->sc = NULL; | |
3bbaaad9 MC |
750 | INIT_LIST_HEAD(&task->running); |
751 | task->state = ISCSI_TASK_PENDING; | |
f6d5180c MC |
752 | |
753 | if (data_size) { | |
9c19a7d0 MC |
754 | memcpy(task->data, data, data_size); |
755 | task->data_count = data_size; | |
f6d5180c | 756 | } else |
9c19a7d0 | 757 | task->data_count = 0; |
f6d5180c | 758 | |
184b57c6 MC |
759 | if (conn->session->tt->alloc_pdu) { |
760 | if (conn->session->tt->alloc_pdu(task, hdr->opcode)) { | |
761 | iscsi_conn_printk(KERN_ERR, conn, "Could not allocate " | |
762 | "pdu for mgmt task.\n"); | |
3bbaaad9 | 763 | goto free_task; |
184b57c6 | 764 | } |
577577da | 765 | } |
184b57c6 | 766 | |
262ef636 | 767 | itt = task->hdr->itt; |
577577da | 768 | task->hdr_len = sizeof(struct iscsi_hdr); |
9c19a7d0 | 769 | memcpy(task->hdr, hdr, sizeof(struct iscsi_hdr)); |
262ef636 MC |
770 | |
771 | if (hdr->itt != RESERVED_ITT) { | |
772 | if (session->tt->parse_pdu_itt) | |
773 | task->hdr->itt = itt; | |
774 | else | |
775 | task->hdr->itt = build_itt(task->itt, | |
776 | task->conn->session->age); | |
777 | } | |
778 | ||
1336aed1 | 779 | if (!ihost->workq) { |
577577da MC |
780 | if (iscsi_prep_mgmt_task(conn, task)) |
781 | goto free_task; | |
052d0144 | 782 | |
9c19a7d0 | 783 | if (session->tt->xmit_task(task)) |
577577da | 784 | goto free_task; |
3bbaaad9 MC |
785 | } else { |
786 | list_add_tail(&task->running, &conn->mgmtqueue); | |
32ae763e | 787 | iscsi_conn_queue_work(conn); |
3bbaaad9 | 788 | } |
052d0144 | 789 | |
9c19a7d0 | 790 | return task; |
577577da MC |
791 | |
792 | free_task: | |
659743b0 SP |
793 | /* regular RX path uses back_lock */ |
794 | spin_lock_bh(&session->back_lock); | |
577577da | 795 | __iscsi_put_task(task); |
659743b0 | 796 | spin_unlock_bh(&session->back_lock); |
577577da | 797 | return NULL; |
f6d5180c MC |
798 | } |
799 | ||
800 | int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr, | |
801 | char *data, uint32_t data_size) | |
802 | { | |
803 | struct iscsi_conn *conn = cls_conn->dd_data; | |
804 | struct iscsi_session *session = conn->session; | |
805 | int err = 0; | |
806 | ||
659743b0 | 807 | spin_lock_bh(&session->frwd_lock); |
f6d5180c MC |
808 | if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size)) |
809 | err = -EPERM; | |
659743b0 | 810 | spin_unlock_bh(&session->frwd_lock); |
f6d5180c MC |
811 | return err; |
812 | } | |
813 | EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu); | |
814 | ||
7996a778 MC |
815 | /** |
816 | * iscsi_cmd_rsp - SCSI Command Response processing | |
817 | * @conn: iscsi connection | |
818 | * @hdr: iscsi header | |
9c19a7d0 | 819 | * @task: scsi command task |
7996a778 MC |
820 | * @data: cmd data buffer |
821 | * @datalen: len of buffer | |
822 | * | |
823 | * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and | |
9c19a7d0 | 824 | * then completes the command and task. |
7996a778 | 825 | **/ |
77a23c21 | 826 | static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
9c19a7d0 | 827 | struct iscsi_task *task, char *data, |
77a23c21 | 828 | int datalen) |
7996a778 | 829 | { |
12352183 | 830 | struct iscsi_scsi_rsp *rhdr = (struct iscsi_scsi_rsp *)hdr; |
7996a778 | 831 | struct iscsi_session *session = conn->session; |
9c19a7d0 | 832 | struct scsi_cmnd *sc = task->sc; |
7996a778 | 833 | |
77a23c21 | 834 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr); |
7996a778 MC |
835 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; |
836 | ||
837 | sc->result = (DID_OK << 16) | rhdr->cmd_status; | |
838 | ||
55e51eda SG |
839 | if (task->protected) { |
840 | sector_t sector; | |
841 | u8 ascq; | |
842 | ||
843 | /** | |
844 | * Transports that didn't implement check_protection | |
845 | * callback but still published T10-PI support to scsi-mid | |
846 | * deserve this BUG_ON. | |
847 | **/ | |
848 | BUG_ON(!session->tt->check_protection); | |
849 | ||
850 | ascq = session->tt->check_protection(task, §or); | |
851 | if (ascq) { | |
852 | sc->result = DRIVER_SENSE << 24 | | |
853 | SAM_STAT_CHECK_CONDITION; | |
854 | scsi_build_sense_buffer(1, sc->sense_buffer, | |
855 | ILLEGAL_REQUEST, 0x10, ascq); | |
856 | sc->sense_buffer[7] = 0xc; /* Additional sense length */ | |
857 | sc->sense_buffer[8] = 0; /* Information desc type */ | |
858 | sc->sense_buffer[9] = 0xa; /* Additional desc length */ | |
859 | sc->sense_buffer[10] = 0x80; /* Validity bit */ | |
860 | ||
861 | put_unaligned_be64(sector, &sc->sense_buffer[12]); | |
862 | goto out; | |
863 | } | |
864 | } | |
865 | ||
7996a778 MC |
866 | if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) { |
867 | sc->result = DID_ERROR << 16; | |
868 | goto out; | |
869 | } | |
870 | ||
871 | if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) { | |
9b80cb4b | 872 | uint16_t senselen; |
7996a778 MC |
873 | |
874 | if (datalen < 2) { | |
875 | invalid_datalen: | |
322d739d MC |
876 | iscsi_conn_printk(KERN_ERR, conn, |
877 | "Got CHECK_CONDITION but invalid data " | |
878 | "buffer size of %d\n", datalen); | |
7996a778 MC |
879 | sc->result = DID_BAD_TARGET << 16; |
880 | goto out; | |
881 | } | |
882 | ||
8f333991 | 883 | senselen = get_unaligned_be16(data); |
7996a778 MC |
884 | if (datalen < senselen) |
885 | goto invalid_datalen; | |
886 | ||
887 | memcpy(sc->sense_buffer, data + 2, | |
9b80cb4b | 888 | min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE)); |
1b2c7af8 MC |
889 | ISCSI_DBG_SESSION(session, "copied %d bytes of sense\n", |
890 | min_t(uint16_t, senselen, | |
891 | SCSI_SENSE_BUFFERSIZE)); | |
7996a778 MC |
892 | } |
893 | ||
c07d4444 BH |
894 | if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW | |
895 | ISCSI_FLAG_CMD_BIDI_OVERFLOW)) { | |
896 | int res_count = be32_to_cpu(rhdr->bi_residual_count); | |
897 | ||
898 | if (scsi_bidi_cmnd(sc) && res_count > 0 && | |
899 | (rhdr->flags & ISCSI_FLAG_CMD_BIDI_OVERFLOW || | |
900 | res_count <= scsi_in(sc)->length)) | |
901 | scsi_in(sc)->resid = res_count; | |
902 | else | |
903 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
904 | } | |
905 | ||
7207fea4 BH |
906 | if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW | |
907 | ISCSI_FLAG_CMD_OVERFLOW)) { | |
7996a778 MC |
908 | int res_count = be32_to_cpu(rhdr->residual_count); |
909 | ||
7207fea4 BH |
910 | if (res_count > 0 && |
911 | (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || | |
912 | res_count <= scsi_bufflen(sc))) | |
c07d4444 | 913 | /* write side for bidi or uni-io set_resid */ |
1c138991 | 914 | scsi_set_resid(sc, res_count); |
7996a778 MC |
915 | else |
916 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
c07d4444 | 917 | } |
7996a778 | 918 | out: |
3bbaaad9 | 919 | ISCSI_DBG_SESSION(session, "cmd rsp done [sc %p res %d itt 0x%x]\n", |
1b2c7af8 | 920 | sc, sc->result, task->itt); |
7996a778 | 921 | conn->scsirsp_pdus_cnt++; |
b3cd5050 | 922 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); |
7996a778 MC |
923 | } |
924 | ||
1d9edf02 MC |
925 | /** |
926 | * iscsi_data_in_rsp - SCSI Data-In Response processing | |
927 | * @conn: iscsi connection | |
928 | * @hdr: iscsi pdu | |
929 | * @task: scsi command task | |
930 | **/ | |
931 | static void | |
932 | iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
933 | struct iscsi_task *task) | |
934 | { | |
935 | struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)hdr; | |
936 | struct scsi_cmnd *sc = task->sc; | |
937 | ||
938 | if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS)) | |
939 | return; | |
940 | ||
edbc9aa0 | 941 | iscsi_update_cmdsn(conn->session, (struct iscsi_nopin *)hdr); |
1d9edf02 MC |
942 | sc->result = (DID_OK << 16) | rhdr->cmd_status; |
943 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; | |
944 | if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW | | |
945 | ISCSI_FLAG_DATA_OVERFLOW)) { | |
946 | int res_count = be32_to_cpu(rhdr->residual_count); | |
947 | ||
948 | if (res_count > 0 && | |
949 | (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || | |
950 | res_count <= scsi_in(sc)->length)) | |
951 | scsi_in(sc)->resid = res_count; | |
952 | else | |
953 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
954 | } | |
955 | ||
3bbaaad9 MC |
956 | ISCSI_DBG_SESSION(conn->session, "data in with status done " |
957 | "[sc %p res %d itt 0x%x]\n", | |
958 | sc, sc->result, task->itt); | |
1d9edf02 | 959 | conn->scsirsp_pdus_cnt++; |
b3cd5050 | 960 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); |
1d9edf02 MC |
961 | } |
962 | ||
7ea8b828 MC |
963 | static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr) |
964 | { | |
965 | struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr; | |
966 | ||
967 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
968 | conn->tmfrsp_pdus_cnt++; | |
969 | ||
843c0a8a | 970 | if (conn->tmf_state != TMF_QUEUED) |
7ea8b828 MC |
971 | return; |
972 | ||
973 | if (tmf->response == ISCSI_TMF_RSP_COMPLETE) | |
843c0a8a | 974 | conn->tmf_state = TMF_SUCCESS; |
7ea8b828 | 975 | else if (tmf->response == ISCSI_TMF_RSP_NO_TASK) |
843c0a8a | 976 | conn->tmf_state = TMF_NOT_FOUND; |
7ea8b828 | 977 | else |
843c0a8a | 978 | conn->tmf_state = TMF_FAILED; |
7ea8b828 MC |
979 | wake_up(&conn->ehwait); |
980 | } | |
981 | ||
f6d5180c MC |
982 | static void iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr) |
983 | { | |
984 | struct iscsi_nopout hdr; | |
9c19a7d0 | 985 | struct iscsi_task *task; |
f6d5180c | 986 | |
9c19a7d0 | 987 | if (!rhdr && conn->ping_task) |
f6d5180c MC |
988 | return; |
989 | ||
990 | memset(&hdr, 0, sizeof(struct iscsi_nopout)); | |
991 | hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE; | |
992 | hdr.flags = ISCSI_FLAG_CMD_FINAL; | |
993 | ||
994 | if (rhdr) { | |
55bdabdf | 995 | hdr.lun = rhdr->lun; |
f6d5180c MC |
996 | hdr.ttt = rhdr->ttt; |
997 | hdr.itt = RESERVED_ITT; | |
998 | } else | |
999 | hdr.ttt = RESERVED_ITT; | |
1000 | ||
9c19a7d0 MC |
1001 | task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0); |
1002 | if (!task) | |
322d739d | 1003 | iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n"); |
d3acf022 MC |
1004 | else if (!rhdr) { |
1005 | /* only track our nops */ | |
1006 | conn->ping_task = task; | |
1007 | conn->last_ping = jiffies; | |
1008 | } | |
f6d5180c MC |
1009 | } |
1010 | ||
8afa1439 MC |
1011 | static int iscsi_nop_out_rsp(struct iscsi_task *task, |
1012 | struct iscsi_nopin *nop, char *data, int datalen) | |
1013 | { | |
1014 | struct iscsi_conn *conn = task->conn; | |
1015 | int rc = 0; | |
1016 | ||
1017 | if (conn->ping_task != task) { | |
1018 | /* | |
1019 | * If this is not in response to one of our | |
1020 | * nops then it must be from userspace. | |
1021 | */ | |
1022 | if (iscsi_recv_pdu(conn->cls_conn, (struct iscsi_hdr *)nop, | |
1023 | data, datalen)) | |
1024 | rc = ISCSI_ERR_CONN_FAILED; | |
1025 | } else | |
1026 | mod_timer(&conn->transport_timer, jiffies + conn->recv_timeout); | |
1027 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); | |
1028 | return rc; | |
1029 | } | |
1030 | ||
62f38300 MC |
1031 | static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
1032 | char *data, int datalen) | |
1033 | { | |
1034 | struct iscsi_reject *reject = (struct iscsi_reject *)hdr; | |
1035 | struct iscsi_hdr rejected_pdu; | |
8afa1439 | 1036 | int opcode, rc = 0; |
62f38300 MC |
1037 | |
1038 | conn->exp_statsn = be32_to_cpu(reject->statsn) + 1; | |
1039 | ||
8afa1439 MC |
1040 | if (ntoh24(reject->dlength) > datalen || |
1041 | ntoh24(reject->dlength) < sizeof(struct iscsi_hdr)) { | |
1042 | iscsi_conn_printk(KERN_ERR, conn, "Cannot handle rejected " | |
1043 | "pdu. Invalid data length (pdu dlength " | |
1044 | "%u, datalen %d\n", ntoh24(reject->dlength), | |
1045 | datalen); | |
1046 | return ISCSI_ERR_PROTO; | |
1047 | } | |
1048 | memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr)); | |
1049 | opcode = rejected_pdu.opcode & ISCSI_OPCODE_MASK; | |
1050 | ||
1051 | switch (reject->reason) { | |
1052 | case ISCSI_REASON_DATA_DIGEST_ERROR: | |
1053 | iscsi_conn_printk(KERN_ERR, conn, | |
1054 | "pdu (op 0x%x itt 0x%x) rejected " | |
1055 | "due to DataDigest error.\n", | |
e5dbbe27 | 1056 | opcode, rejected_pdu.itt); |
8afa1439 MC |
1057 | break; |
1058 | case ISCSI_REASON_IMM_CMD_REJECT: | |
1059 | iscsi_conn_printk(KERN_ERR, conn, | |
1060 | "pdu (op 0x%x itt 0x%x) rejected. Too many " | |
1061 | "immediate commands.\n", | |
e5dbbe27 | 1062 | opcode, rejected_pdu.itt); |
8afa1439 MC |
1063 | /* |
1064 | * We only send one TMF at a time so if the target could not | |
1065 | * handle it, then it should get fixed (RFC mandates that | |
1066 | * a target can handle one immediate TMF per conn). | |
1067 | * | |
1068 | * For nops-outs, we could have sent more than one if | |
1069 | * the target is sending us lots of nop-ins | |
1070 | */ | |
1071 | if (opcode != ISCSI_OP_NOOP_OUT) | |
1072 | return 0; | |
62f38300 | 1073 | |
659743b0 | 1074 | if (rejected_pdu.itt == cpu_to_be32(ISCSI_RESERVED_TAG)) { |
8afa1439 MC |
1075 | /* |
1076 | * nop-out in response to target's nop-out rejected. | |
1077 | * Just resend. | |
1078 | */ | |
659743b0 SP |
1079 | /* In RX path we are under back lock */ |
1080 | spin_unlock(&conn->session->back_lock); | |
1081 | spin_lock(&conn->session->frwd_lock); | |
8afa1439 MC |
1082 | iscsi_send_nopout(conn, |
1083 | (struct iscsi_nopin*)&rejected_pdu); | |
659743b0 SP |
1084 | spin_unlock(&conn->session->frwd_lock); |
1085 | spin_lock(&conn->session->back_lock); | |
1086 | } else { | |
8afa1439 MC |
1087 | struct iscsi_task *task; |
1088 | /* | |
1089 | * Our nop as ping got dropped. We know the target | |
1090 | * and transport are ok so just clean up | |
1091 | */ | |
1092 | task = iscsi_itt_to_task(conn, rejected_pdu.itt); | |
1093 | if (!task) { | |
1094 | iscsi_conn_printk(KERN_ERR, conn, | |
1095 | "Invalid pdu reject. Could " | |
1096 | "not lookup rejected task.\n"); | |
1097 | rc = ISCSI_ERR_BAD_ITT; | |
1098 | } else | |
1099 | rc = iscsi_nop_out_rsp(task, | |
1100 | (struct iscsi_nopin*)&rejected_pdu, | |
1101 | NULL, 0); | |
62f38300 | 1102 | } |
8afa1439 MC |
1103 | break; |
1104 | default: | |
1105 | iscsi_conn_printk(KERN_ERR, conn, | |
1106 | "pdu (op 0x%x itt 0x%x) rejected. Reason " | |
e5dbbe27 VC |
1107 | "code 0x%x\n", rejected_pdu.opcode, |
1108 | rejected_pdu.itt, reject->reason); | |
8afa1439 | 1109 | break; |
62f38300 | 1110 | } |
8afa1439 | 1111 | return rc; |
62f38300 MC |
1112 | } |
1113 | ||
913e5bf4 MC |
1114 | /** |
1115 | * iscsi_itt_to_task - look up task by itt | |
1116 | * @conn: iscsi connection | |
1117 | * @itt: itt | |
1118 | * | |
1119 | * This should be used for mgmt tasks like login and nops, or if | |
1120 | * the LDD's itt space does not include the session age. | |
1121 | * | |
659743b0 | 1122 | * The session back_lock must be held. |
913e5bf4 | 1123 | */ |
8f9256ce | 1124 | struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *conn, itt_t itt) |
913e5bf4 MC |
1125 | { |
1126 | struct iscsi_session *session = conn->session; | |
262ef636 | 1127 | int i; |
913e5bf4 MC |
1128 | |
1129 | if (itt == RESERVED_ITT) | |
1130 | return NULL; | |
1131 | ||
262ef636 MC |
1132 | if (session->tt->parse_pdu_itt) |
1133 | session->tt->parse_pdu_itt(conn, itt, &i, NULL); | |
1134 | else | |
1135 | i = get_itt(itt); | |
913e5bf4 MC |
1136 | if (i >= session->cmds_max) |
1137 | return NULL; | |
1138 | ||
1139 | return session->cmds[i]; | |
1140 | } | |
8f9256ce | 1141 | EXPORT_SYMBOL_GPL(iscsi_itt_to_task); |
913e5bf4 | 1142 | |
7996a778 MC |
1143 | /** |
1144 | * __iscsi_complete_pdu - complete pdu | |
1145 | * @conn: iscsi conn | |
1146 | * @hdr: iscsi header | |
1147 | * @data: data buffer | |
1148 | * @datalen: len of data buffer | |
1149 | * | |
1150 | * Completes pdu processing by freeing any resources allocated at | |
659743b0 | 1151 | * queuecommand or send generic. session back_lock must be held and verify |
7996a778 MC |
1152 | * itt must have been called. |
1153 | */ | |
913e5bf4 MC |
1154 | int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
1155 | char *data, int datalen) | |
7996a778 MC |
1156 | { |
1157 | struct iscsi_session *session = conn->session; | |
1158 | int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0; | |
9c19a7d0 | 1159 | struct iscsi_task *task; |
7996a778 MC |
1160 | uint32_t itt; |
1161 | ||
f6d5180c | 1162 | conn->last_recv = jiffies; |
0af967f5 MC |
1163 | rc = iscsi_verify_itt(conn, hdr->itt); |
1164 | if (rc) | |
1165 | return rc; | |
1166 | ||
b4377356 AV |
1167 | if (hdr->itt != RESERVED_ITT) |
1168 | itt = get_itt(hdr->itt); | |
7996a778 | 1169 | else |
b4377356 | 1170 | itt = ~0U; |
7996a778 | 1171 | |
1b2c7af8 MC |
1172 | ISCSI_DBG_SESSION(session, "[op 0x%x cid %d itt 0x%x len %d]\n", |
1173 | opcode, conn->id, itt, datalen); | |
7996a778 | 1174 | |
3e5c28ad | 1175 | if (itt == ~0U) { |
77a23c21 | 1176 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); |
62f38300 | 1177 | |
7996a778 MC |
1178 | switch(opcode) { |
1179 | case ISCSI_OP_NOOP_IN: | |
40527afe | 1180 | if (datalen) { |
7996a778 | 1181 | rc = ISCSI_ERR_PROTO; |
40527afe MC |
1182 | break; |
1183 | } | |
1184 | ||
b4377356 | 1185 | if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG)) |
40527afe MC |
1186 | break; |
1187 | ||
659743b0 SP |
1188 | /* In RX path we are under back lock */ |
1189 | spin_unlock(&session->back_lock); | |
1190 | spin_lock(&session->frwd_lock); | |
f6d5180c | 1191 | iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr); |
659743b0 SP |
1192 | spin_unlock(&session->frwd_lock); |
1193 | spin_lock(&session->back_lock); | |
7996a778 MC |
1194 | break; |
1195 | case ISCSI_OP_REJECT: | |
62f38300 MC |
1196 | rc = iscsi_handle_reject(conn, hdr, data, datalen); |
1197 | break; | |
7996a778 | 1198 | case ISCSI_OP_ASYNC_EVENT: |
8d2860b3 | 1199 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; |
5831c737 MC |
1200 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) |
1201 | rc = ISCSI_ERR_CONN_FAILED; | |
7996a778 MC |
1202 | break; |
1203 | default: | |
1204 | rc = ISCSI_ERR_BAD_OPCODE; | |
1205 | break; | |
1206 | } | |
3e5c28ad MC |
1207 | goto out; |
1208 | } | |
1209 | ||
3e5c28ad MC |
1210 | switch(opcode) { |
1211 | case ISCSI_OP_SCSI_CMD_RSP: | |
913e5bf4 MC |
1212 | case ISCSI_OP_SCSI_DATA_IN: |
1213 | task = iscsi_itt_to_ctask(conn, hdr->itt); | |
1214 | if (!task) | |
1215 | return ISCSI_ERR_BAD_ITT; | |
d355e57d | 1216 | task->last_xfer = jiffies; |
913e5bf4 MC |
1217 | break; |
1218 | case ISCSI_OP_R2T: | |
1219 | /* | |
1220 | * LLD handles R2Ts if they need to. | |
1221 | */ | |
1222 | return 0; | |
1223 | case ISCSI_OP_LOGOUT_RSP: | |
1224 | case ISCSI_OP_LOGIN_RSP: | |
1225 | case ISCSI_OP_TEXT_RSP: | |
1226 | case ISCSI_OP_SCSI_TMFUNC_RSP: | |
1227 | case ISCSI_OP_NOOP_IN: | |
1228 | task = iscsi_itt_to_task(conn, hdr->itt); | |
1229 | if (!task) | |
1230 | return ISCSI_ERR_BAD_ITT; | |
1231 | break; | |
1232 | default: | |
1233 | return ISCSI_ERR_BAD_OPCODE; | |
1234 | } | |
1235 | ||
1236 | switch(opcode) { | |
1237 | case ISCSI_OP_SCSI_CMD_RSP: | |
9c19a7d0 | 1238 | iscsi_scsi_cmd_rsp(conn, hdr, task, data, datalen); |
3e5c28ad MC |
1239 | break; |
1240 | case ISCSI_OP_SCSI_DATA_IN: | |
1d9edf02 | 1241 | iscsi_data_in_rsp(conn, hdr, task); |
3e5c28ad | 1242 | break; |
3e5c28ad MC |
1243 | case ISCSI_OP_LOGOUT_RSP: |
1244 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
1245 | if (datalen) { | |
1246 | rc = ISCSI_ERR_PROTO; | |
1247 | break; | |
1248 | } | |
1249 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
1250 | goto recv_pdu; | |
1251 | case ISCSI_OP_LOGIN_RSP: | |
1252 | case ISCSI_OP_TEXT_RSP: | |
1253 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
1254 | /* | |
1255 | * login related PDU's exp_statsn is handled in | |
1256 | * userspace | |
1257 | */ | |
1258 | goto recv_pdu; | |
1259 | case ISCSI_OP_SCSI_TMFUNC_RSP: | |
1260 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
1261 | if (datalen) { | |
1262 | rc = ISCSI_ERR_PROTO; | |
1263 | break; | |
1264 | } | |
1265 | ||
1266 | iscsi_tmf_rsp(conn, hdr); | |
b3cd5050 | 1267 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); |
3e5c28ad MC |
1268 | break; |
1269 | case ISCSI_OP_NOOP_IN: | |
1270 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
1271 | if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) { | |
1272 | rc = ISCSI_ERR_PROTO; | |
1273 | break; | |
1274 | } | |
1275 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
1276 | ||
8afa1439 MC |
1277 | rc = iscsi_nop_out_rsp(task, (struct iscsi_nopin*)hdr, |
1278 | data, datalen); | |
3e5c28ad MC |
1279 | break; |
1280 | default: | |
1281 | rc = ISCSI_ERR_BAD_OPCODE; | |
1282 | break; | |
1283 | } | |
7996a778 | 1284 | |
3e5c28ad MC |
1285 | out: |
1286 | return rc; | |
1287 | recv_pdu: | |
1288 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) | |
1289 | rc = ISCSI_ERR_CONN_FAILED; | |
b3cd5050 | 1290 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); |
7996a778 MC |
1291 | return rc; |
1292 | } | |
913e5bf4 | 1293 | EXPORT_SYMBOL_GPL(__iscsi_complete_pdu); |
7996a778 MC |
1294 | |
1295 | int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
1296 | char *data, int datalen) | |
1297 | { | |
1298 | int rc; | |
1299 | ||
659743b0 | 1300 | spin_lock(&conn->session->back_lock); |
7996a778 | 1301 | rc = __iscsi_complete_pdu(conn, hdr, data, datalen); |
659743b0 | 1302 | spin_unlock(&conn->session->back_lock); |
7996a778 MC |
1303 | return rc; |
1304 | } | |
1305 | EXPORT_SYMBOL_GPL(iscsi_complete_pdu); | |
1306 | ||
0af967f5 | 1307 | int iscsi_verify_itt(struct iscsi_conn *conn, itt_t itt) |
7996a778 MC |
1308 | { |
1309 | struct iscsi_session *session = conn->session; | |
262ef636 | 1310 | int age = 0, i = 0; |
7996a778 | 1311 | |
0af967f5 MC |
1312 | if (itt == RESERVED_ITT) |
1313 | return 0; | |
7996a778 | 1314 | |
262ef636 MC |
1315 | if (session->tt->parse_pdu_itt) |
1316 | session->tt->parse_pdu_itt(conn, itt, &i, &age); | |
1317 | else { | |
1318 | i = get_itt(itt); | |
1319 | age = ((__force u32)itt >> ISCSI_AGE_SHIFT) & ISCSI_AGE_MASK; | |
1320 | } | |
1321 | ||
1322 | if (age != session->age) { | |
0af967f5 MC |
1323 | iscsi_conn_printk(KERN_ERR, conn, |
1324 | "received itt %x expected session age (%x)\n", | |
913e5bf4 | 1325 | (__force u32)itt, session->age); |
0af967f5 MC |
1326 | return ISCSI_ERR_BAD_ITT; |
1327 | } | |
7996a778 | 1328 | |
3e5c28ad MC |
1329 | if (i >= session->cmds_max) { |
1330 | iscsi_conn_printk(KERN_ERR, conn, | |
1331 | "received invalid itt index %u (max cmds " | |
1332 | "%u.\n", i, session->cmds_max); | |
1333 | return ISCSI_ERR_BAD_ITT; | |
7996a778 | 1334 | } |
7996a778 MC |
1335 | return 0; |
1336 | } | |
1337 | EXPORT_SYMBOL_GPL(iscsi_verify_itt); | |
1338 | ||
913e5bf4 MC |
1339 | /** |
1340 | * iscsi_itt_to_ctask - look up ctask by itt | |
1341 | * @conn: iscsi connection | |
1342 | * @itt: itt | |
1343 | * | |
1344 | * This should be used for cmd tasks. | |
1345 | * | |
659743b0 | 1346 | * The session back_lock must be held. |
913e5bf4 MC |
1347 | */ |
1348 | struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *conn, itt_t itt) | |
0af967f5 | 1349 | { |
9c19a7d0 | 1350 | struct iscsi_task *task; |
0af967f5 MC |
1351 | |
1352 | if (iscsi_verify_itt(conn, itt)) | |
1353 | return NULL; | |
1354 | ||
913e5bf4 MC |
1355 | task = iscsi_itt_to_task(conn, itt); |
1356 | if (!task || !task->sc) | |
0af967f5 MC |
1357 | return NULL; |
1358 | ||
913e5bf4 MC |
1359 | if (task->sc->SCp.phase != conn->session->age) { |
1360 | iscsi_session_printk(KERN_ERR, conn->session, | |
1361 | "task's session age %d, expected %d\n", | |
1362 | task->sc->SCp.phase, conn->session->age); | |
0af967f5 | 1363 | return NULL; |
913e5bf4 | 1364 | } |
0af967f5 | 1365 | |
9c19a7d0 | 1366 | return task; |
0af967f5 MC |
1367 | } |
1368 | EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask); | |
1369 | ||
40a06e75 | 1370 | void iscsi_session_failure(struct iscsi_session *session, |
e5bd7b54 MC |
1371 | enum iscsi_err err) |
1372 | { | |
e5bd7b54 MC |
1373 | struct iscsi_conn *conn; |
1374 | struct device *dev; | |
e5bd7b54 | 1375 | |
659743b0 | 1376 | spin_lock_bh(&session->frwd_lock); |
e5bd7b54 MC |
1377 | conn = session->leadconn; |
1378 | if (session->state == ISCSI_STATE_TERMINATE || !conn) { | |
659743b0 | 1379 | spin_unlock_bh(&session->frwd_lock); |
e5bd7b54 MC |
1380 | return; |
1381 | } | |
1382 | ||
1383 | dev = get_device(&conn->cls_conn->dev); | |
659743b0 | 1384 | spin_unlock_bh(&session->frwd_lock); |
e5bd7b54 MC |
1385 | if (!dev) |
1386 | return; | |
1387 | /* | |
1388 | * if the host is being removed bypass the connection | |
1389 | * recovery initialization because we are going to kill | |
1390 | * the session. | |
1391 | */ | |
1392 | if (err == ISCSI_ERR_INVALID_HOST) | |
1393 | iscsi_conn_error_event(conn->cls_conn, err); | |
1394 | else | |
1395 | iscsi_conn_failure(conn, err); | |
1396 | put_device(dev); | |
1397 | } | |
1398 | EXPORT_SYMBOL_GPL(iscsi_session_failure); | |
1399 | ||
7996a778 MC |
1400 | void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err) |
1401 | { | |
1402 | struct iscsi_session *session = conn->session; | |
7996a778 | 1403 | |
659743b0 | 1404 | spin_lock_bh(&session->frwd_lock); |
656cffc9 | 1405 | if (session->state == ISCSI_STATE_FAILED) { |
659743b0 | 1406 | spin_unlock_bh(&session->frwd_lock); |
656cffc9 MC |
1407 | return; |
1408 | } | |
1409 | ||
67a61114 | 1410 | if (conn->stop_stage == 0) |
7996a778 | 1411 | session->state = ISCSI_STATE_FAILED; |
659743b0 | 1412 | spin_unlock_bh(&session->frwd_lock); |
e5bd7b54 | 1413 | |
7996a778 MC |
1414 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); |
1415 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
e5bd7b54 | 1416 | iscsi_conn_error_event(conn->cls_conn, err); |
7996a778 MC |
1417 | } |
1418 | EXPORT_SYMBOL_GPL(iscsi_conn_failure); | |
1419 | ||
77a23c21 MC |
1420 | static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn) |
1421 | { | |
1422 | struct iscsi_session *session = conn->session; | |
1423 | ||
1424 | /* | |
1425 | * Check for iSCSI window and take care of CmdSN wrap-around | |
1426 | */ | |
e0726407 | 1427 | if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) { |
1b2c7af8 MC |
1428 | ISCSI_DBG_SESSION(session, "iSCSI CmdSN closed. ExpCmdSn " |
1429 | "%u MaxCmdSN %u CmdSN %u/%u\n", | |
1430 | session->exp_cmdsn, session->max_cmdsn, | |
1431 | session->cmdsn, session->queued_cmdsn); | |
77a23c21 MC |
1432 | return -ENOSPC; |
1433 | } | |
1434 | return 0; | |
1435 | } | |
1436 | ||
9c19a7d0 | 1437 | static int iscsi_xmit_task(struct iscsi_conn *conn) |
77a23c21 | 1438 | { |
9c19a7d0 | 1439 | struct iscsi_task *task = conn->task; |
843c0a8a | 1440 | int rc; |
77a23c21 | 1441 | |
70b31c15 MC |
1442 | if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) |
1443 | return -ENODATA; | |
1444 | ||
9c19a7d0 | 1445 | __iscsi_get_task(task); |
659743b0 | 1446 | spin_unlock_bh(&conn->session->frwd_lock); |
9c19a7d0 | 1447 | rc = conn->session->tt->xmit_task(task); |
659743b0 | 1448 | spin_lock_bh(&conn->session->frwd_lock); |
d355e57d | 1449 | if (!rc) { |
9c19a7d0 | 1450 | /* done with this task */ |
d355e57d | 1451 | task->last_xfer = jiffies; |
9c19a7d0 | 1452 | conn->task = NULL; |
d355e57d | 1453 | } |
659743b0 | 1454 | /* regular RX path uses back_lock */ |
72b97402 | 1455 | spin_lock(&conn->session->back_lock); |
d355e57d | 1456 | __iscsi_put_task(task); |
72b97402 | 1457 | spin_unlock(&conn->session->back_lock); |
77a23c21 MC |
1458 | return rc; |
1459 | } | |
1460 | ||
843c0a8a | 1461 | /** |
9c19a7d0 MC |
1462 | * iscsi_requeue_task - requeue task to run from session workqueue |
1463 | * @task: task to requeue | |
843c0a8a | 1464 | * |
9c19a7d0 | 1465 | * LLDs that need to run a task from the session workqueue should call |
659743b0 | 1466 | * this. The session frwd_lock must be held. This should only be called |
052d0144 | 1467 | * by software drivers. |
843c0a8a | 1468 | */ |
9c19a7d0 | 1469 | void iscsi_requeue_task(struct iscsi_task *task) |
843c0a8a | 1470 | { |
9c19a7d0 | 1471 | struct iscsi_conn *conn = task->conn; |
843c0a8a | 1472 | |
3bbaaad9 MC |
1473 | /* |
1474 | * this may be on the requeue list already if the xmit_task callout | |
1475 | * is handling the r2ts while we are adding new ones | |
1476 | */ | |
1477 | if (list_empty(&task->running)) | |
1478 | list_add_tail(&task->running, &conn->requeue); | |
32ae763e | 1479 | iscsi_conn_queue_work(conn); |
843c0a8a | 1480 | } |
9c19a7d0 | 1481 | EXPORT_SYMBOL_GPL(iscsi_requeue_task); |
843c0a8a | 1482 | |
7996a778 MC |
1483 | /** |
1484 | * iscsi_data_xmit - xmit any command into the scheduled connection | |
1485 | * @conn: iscsi connection | |
1486 | * | |
1487 | * Notes: | |
1488 | * The function can return -EAGAIN in which case the caller must | |
1489 | * re-schedule it again later or recover. '0' return code means | |
1490 | * successful xmit. | |
1491 | **/ | |
1492 | static int iscsi_data_xmit(struct iscsi_conn *conn) | |
1493 | { | |
5d12c05e | 1494 | struct iscsi_task *task; |
3219e529 | 1495 | int rc = 0; |
7996a778 | 1496 | |
659743b0 | 1497 | spin_lock_bh(&conn->session->frwd_lock); |
70b31c15 | 1498 | if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) { |
1b2c7af8 | 1499 | ISCSI_DBG_SESSION(conn->session, "Tx suspended!\n"); |
659743b0 | 1500 | spin_unlock_bh(&conn->session->frwd_lock); |
3219e529 | 1501 | return -ENODATA; |
7996a778 | 1502 | } |
7996a778 | 1503 | |
9c19a7d0 MC |
1504 | if (conn->task) { |
1505 | rc = iscsi_xmit_task(conn); | |
3219e529 | 1506 | if (rc) |
70b31c15 | 1507 | goto done; |
7996a778 MC |
1508 | } |
1509 | ||
77a23c21 MC |
1510 | /* |
1511 | * process mgmt pdus like nops before commands since we should | |
1512 | * only have one nop-out as a ping from us and targets should not | |
1513 | * overflow us with nop-ins | |
1514 | */ | |
1515 | check_mgmt: | |
843c0a8a | 1516 | while (!list_empty(&conn->mgmtqueue)) { |
9c19a7d0 MC |
1517 | conn->task = list_entry(conn->mgmtqueue.next, |
1518 | struct iscsi_task, running); | |
3bbaaad9 | 1519 | list_del_init(&conn->task->running); |
9c19a7d0 | 1520 | if (iscsi_prep_mgmt_task(conn, conn->task)) { |
659743b0 SP |
1521 | /* regular RX path uses back_lock */ |
1522 | spin_lock_bh(&conn->session->back_lock); | |
9c19a7d0 | 1523 | __iscsi_put_task(conn->task); |
659743b0 | 1524 | spin_unlock_bh(&conn->session->back_lock); |
9c19a7d0 | 1525 | conn->task = NULL; |
b3a7ea8d MC |
1526 | continue; |
1527 | } | |
9c19a7d0 | 1528 | rc = iscsi_xmit_task(conn); |
77a23c21 | 1529 | if (rc) |
70b31c15 | 1530 | goto done; |
7996a778 MC |
1531 | } |
1532 | ||
843c0a8a | 1533 | /* process pending command queue */ |
3bbaaad9 | 1534 | while (!list_empty(&conn->cmdqueue)) { |
5d12c05e MC |
1535 | conn->task = list_entry(conn->cmdqueue.next, struct iscsi_task, |
1536 | running); | |
3bbaaad9 | 1537 | list_del_init(&conn->task->running); |
b3a7ea8d | 1538 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) { |
b3cd5050 | 1539 | fail_scsi_task(conn->task, DID_IMM_RETRY); |
b3a7ea8d MC |
1540 | continue; |
1541 | } | |
577577da MC |
1542 | rc = iscsi_prep_scsi_cmd_pdu(conn->task); |
1543 | if (rc) { | |
5d12c05e | 1544 | if (rc == -ENOMEM || rc == -EACCES) { |
3bbaaad9 MC |
1545 | list_add_tail(&conn->task->running, |
1546 | &conn->cmdqueue); | |
577577da | 1547 | conn->task = NULL; |
70b31c15 | 1548 | goto done; |
577577da | 1549 | } else |
b3cd5050 | 1550 | fail_scsi_task(conn->task, DID_ABORT); |
004d6530 BH |
1551 | continue; |
1552 | } | |
9c19a7d0 | 1553 | rc = iscsi_xmit_task(conn); |
77a23c21 | 1554 | if (rc) |
70b31c15 | 1555 | goto done; |
77a23c21 | 1556 | /* |
9c19a7d0 | 1557 | * we could continuously get new task requests so |
77a23c21 MC |
1558 | * we need to check the mgmt queue for nops that need to |
1559 | * be sent to aviod starvation | |
1560 | */ | |
843c0a8a MC |
1561 | if (!list_empty(&conn->mgmtqueue)) |
1562 | goto check_mgmt; | |
1563 | } | |
1564 | ||
1565 | while (!list_empty(&conn->requeue)) { | |
b3a7ea8d MC |
1566 | /* |
1567 | * we always do fastlogout - conn stop code will clean up. | |
1568 | */ | |
1569 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) | |
1570 | break; | |
1571 | ||
5d12c05e MC |
1572 | task = list_entry(conn->requeue.next, struct iscsi_task, |
1573 | running); | |
1574 | if (iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_DATA_OUT)) | |
1575 | break; | |
1576 | ||
1577 | conn->task = task; | |
3bbaaad9 | 1578 | list_del_init(&conn->task->running); |
9c19a7d0 | 1579 | conn->task->state = ISCSI_TASK_RUNNING; |
9c19a7d0 | 1580 | rc = iscsi_xmit_task(conn); |
843c0a8a | 1581 | if (rc) |
70b31c15 | 1582 | goto done; |
843c0a8a | 1583 | if (!list_empty(&conn->mgmtqueue)) |
77a23c21 | 1584 | goto check_mgmt; |
7996a778 | 1585 | } |
659743b0 | 1586 | spin_unlock_bh(&conn->session->frwd_lock); |
3219e529 | 1587 | return -ENODATA; |
7996a778 | 1588 | |
70b31c15 | 1589 | done: |
659743b0 | 1590 | spin_unlock_bh(&conn->session->frwd_lock); |
3219e529 | 1591 | return rc; |
7996a778 MC |
1592 | } |
1593 | ||
c4028958 | 1594 | static void iscsi_xmitworker(struct work_struct *work) |
7996a778 | 1595 | { |
c4028958 DH |
1596 | struct iscsi_conn *conn = |
1597 | container_of(work, struct iscsi_conn, xmitwork); | |
3219e529 | 1598 | int rc; |
7996a778 MC |
1599 | /* |
1600 | * serialize Xmit worker on a per-connection basis. | |
1601 | */ | |
3219e529 MC |
1602 | do { |
1603 | rc = iscsi_data_xmit(conn); | |
1604 | } while (rc >= 0 || rc == -EAGAIN); | |
7996a778 MC |
1605 | } |
1606 | ||
577577da MC |
1607 | static inline struct iscsi_task *iscsi_alloc_task(struct iscsi_conn *conn, |
1608 | struct scsi_cmnd *sc) | |
1609 | { | |
1610 | struct iscsi_task *task; | |
1611 | ||
7acd72eb | 1612 | if (!kfifo_out(&conn->session->cmdpool.queue, |
577577da MC |
1613 | (void *) &task, sizeof(void *))) |
1614 | return NULL; | |
1615 | ||
1616 | sc->SCp.phase = conn->session->age; | |
1617 | sc->SCp.ptr = (char *) task; | |
1618 | ||
1619 | atomic_set(&task->refcount, 1); | |
1620 | task->state = ISCSI_TASK_PENDING; | |
1621 | task->conn = conn; | |
1622 | task->sc = sc; | |
d355e57d MC |
1623 | task->have_checked_conn = false; |
1624 | task->last_timeout = jiffies; | |
1625 | task->last_xfer = jiffies; | |
55e51eda | 1626 | task->protected = false; |
577577da MC |
1627 | INIT_LIST_HEAD(&task->running); |
1628 | return task; | |
1629 | } | |
1630 | ||
7996a778 MC |
1631 | enum { |
1632 | FAILURE_BAD_HOST = 1, | |
1633 | FAILURE_SESSION_FAILED, | |
1634 | FAILURE_SESSION_FREED, | |
1635 | FAILURE_WINDOW_CLOSED, | |
60ecebf5 | 1636 | FAILURE_OOM, |
7996a778 | 1637 | FAILURE_SESSION_TERMINATE, |
656cffc9 | 1638 | FAILURE_SESSION_IN_RECOVERY, |
7996a778 | 1639 | FAILURE_SESSION_RECOVERY_TIMEOUT, |
b3a7ea8d | 1640 | FAILURE_SESSION_LOGGING_OUT, |
6eabafbe | 1641 | FAILURE_SESSION_NOT_READY, |
7996a778 MC |
1642 | }; |
1643 | ||
f41d4721 | 1644 | int iscsi_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc) |
7996a778 | 1645 | { |
75613521 | 1646 | struct iscsi_cls_session *cls_session; |
1336aed1 | 1647 | struct iscsi_host *ihost; |
7996a778 MC |
1648 | int reason = 0; |
1649 | struct iscsi_session *session; | |
1650 | struct iscsi_conn *conn; | |
9c19a7d0 | 1651 | struct iscsi_task *task = NULL; |
7996a778 | 1652 | |
7996a778 | 1653 | sc->result = 0; |
f47f2cf5 | 1654 | sc->SCp.ptr = NULL; |
7996a778 | 1655 | |
1336aed1 | 1656 | ihost = shost_priv(host); |
7996a778 | 1657 | |
75613521 MC |
1658 | cls_session = starget_to_session(scsi_target(sc->device)); |
1659 | session = cls_session->dd_data; | |
659743b0 | 1660 | spin_lock_bh(&session->frwd_lock); |
7996a778 | 1661 | |
75613521 | 1662 | reason = iscsi_session_chkready(cls_session); |
6eabafbe MC |
1663 | if (reason) { |
1664 | sc->result = reason; | |
1665 | goto fault; | |
1666 | } | |
1667 | ||
301e0f7e | 1668 | if (session->state != ISCSI_STATE_LOGGED_IN) { |
656cffc9 MC |
1669 | /* |
1670 | * to handle the race between when we set the recovery state | |
1671 | * and block the session we requeue here (commands could | |
1672 | * be entering our queuecommand while a block is starting | |
1673 | * up because the block code is not locked) | |
1674 | */ | |
9000bcd6 | 1675 | switch (session->state) { |
301e0f7e | 1676 | case ISCSI_STATE_FAILED: |
9000bcd6 | 1677 | case ISCSI_STATE_IN_RECOVERY: |
656cffc9 | 1678 | reason = FAILURE_SESSION_IN_RECOVERY; |
301e0f7e MC |
1679 | sc->result = DID_IMM_RETRY << 16; |
1680 | break; | |
9000bcd6 MC |
1681 | case ISCSI_STATE_LOGGING_OUT: |
1682 | reason = FAILURE_SESSION_LOGGING_OUT; | |
301e0f7e MC |
1683 | sc->result = DID_IMM_RETRY << 16; |
1684 | break; | |
b3a7ea8d | 1685 | case ISCSI_STATE_RECOVERY_FAILED: |
656cffc9 | 1686 | reason = FAILURE_SESSION_RECOVERY_TIMEOUT; |
56d7fcfa | 1687 | sc->result = DID_TRANSPORT_FAILFAST << 16; |
b3a7ea8d MC |
1688 | break; |
1689 | case ISCSI_STATE_TERMINATE: | |
656cffc9 | 1690 | reason = FAILURE_SESSION_TERMINATE; |
6eabafbe | 1691 | sc->result = DID_NO_CONNECT << 16; |
b3a7ea8d | 1692 | break; |
b3a7ea8d | 1693 | default: |
656cffc9 | 1694 | reason = FAILURE_SESSION_FREED; |
6eabafbe | 1695 | sc->result = DID_NO_CONNECT << 16; |
b3a7ea8d | 1696 | } |
7996a778 MC |
1697 | goto fault; |
1698 | } | |
1699 | ||
7996a778 | 1700 | conn = session->leadconn; |
98644047 MC |
1701 | if (!conn) { |
1702 | reason = FAILURE_SESSION_FREED; | |
6eabafbe | 1703 | sc->result = DID_NO_CONNECT << 16; |
98644047 MC |
1704 | goto fault; |
1705 | } | |
7996a778 | 1706 | |
661134ad MC |
1707 | if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) { |
1708 | reason = FAILURE_SESSION_IN_RECOVERY; | |
1709 | sc->result = DID_REQUEUE; | |
1710 | goto fault; | |
1711 | } | |
1712 | ||
77a23c21 MC |
1713 | if (iscsi_check_cmdsn_window_closed(conn)) { |
1714 | reason = FAILURE_WINDOW_CLOSED; | |
1715 | goto reject; | |
1716 | } | |
1717 | ||
577577da MC |
1718 | task = iscsi_alloc_task(conn, sc); |
1719 | if (!task) { | |
60ecebf5 MC |
1720 | reason = FAILURE_OOM; |
1721 | goto reject; | |
1722 | } | |
7996a778 | 1723 | |
1336aed1 | 1724 | if (!ihost->workq) { |
577577da MC |
1725 | reason = iscsi_prep_scsi_cmd_pdu(task); |
1726 | if (reason) { | |
5d12c05e | 1727 | if (reason == -ENOMEM || reason == -EACCES) { |
577577da MC |
1728 | reason = FAILURE_OOM; |
1729 | goto prepd_reject; | |
1730 | } else { | |
1731 | sc->result = DID_ABORT << 16; | |
1732 | goto prepd_fault; | |
1733 | } | |
052d0144 | 1734 | } |
9c19a7d0 | 1735 | if (session->tt->xmit_task(task)) { |
d3305f34 | 1736 | session->cmdsn--; |
052d0144 | 1737 | reason = FAILURE_SESSION_NOT_READY; |
577577da | 1738 | goto prepd_reject; |
052d0144 | 1739 | } |
3bbaaad9 MC |
1740 | } else { |
1741 | list_add_tail(&task->running, &conn->cmdqueue); | |
32ae763e | 1742 | iscsi_conn_queue_work(conn); |
3bbaaad9 | 1743 | } |
052d0144 MC |
1744 | |
1745 | session->queued_cmdsn++; | |
659743b0 | 1746 | spin_unlock_bh(&session->frwd_lock); |
7996a778 MC |
1747 | return 0; |
1748 | ||
577577da | 1749 | prepd_reject: |
f41d4721 | 1750 | iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ); |
7996a778 | 1751 | reject: |
659743b0 | 1752 | spin_unlock_bh(&session->frwd_lock); |
1b2c7af8 MC |
1753 | ISCSI_DBG_SESSION(session, "cmd 0x%x rejected (%d)\n", |
1754 | sc->cmnd[0], reason); | |
d6d13ee1 | 1755 | return SCSI_MLQUEUE_TARGET_BUSY; |
7996a778 | 1756 | |
577577da | 1757 | prepd_fault: |
f41d4721 | 1758 | iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ); |
7996a778 | 1759 | fault: |
659743b0 | 1760 | spin_unlock_bh(&session->frwd_lock); |
1b2c7af8 MC |
1761 | ISCSI_DBG_SESSION(session, "iscsi: cmd 0x%x is not queued (%d)\n", |
1762 | sc->cmnd[0], reason); | |
c07d4444 BH |
1763 | if (!scsi_bidi_cmnd(sc)) |
1764 | scsi_set_resid(sc, scsi_bufflen(sc)); | |
1765 | else { | |
1766 | scsi_out(sc)->resid = scsi_out(sc)->length; | |
1767 | scsi_in(sc)->resid = scsi_in(sc)->length; | |
1768 | } | |
f41d4721 | 1769 | sc->scsi_done(sc); |
7996a778 MC |
1770 | return 0; |
1771 | } | |
1772 | EXPORT_SYMBOL_GPL(iscsi_queuecommand); | |
1773 | ||
6b5d6c44 MC |
1774 | int iscsi_target_alloc(struct scsi_target *starget) |
1775 | { | |
1776 | struct iscsi_cls_session *cls_session = starget_to_session(starget); | |
1777 | struct iscsi_session *session = cls_session->dd_data; | |
1778 | ||
1779 | starget->can_queue = session->scsi_cmds_max; | |
1780 | return 0; | |
1781 | } | |
1782 | EXPORT_SYMBOL_GPL(iscsi_target_alloc); | |
1783 | ||
843c0a8a | 1784 | static void iscsi_tmf_timedout(unsigned long data) |
7996a778 | 1785 | { |
843c0a8a | 1786 | struct iscsi_conn *conn = (struct iscsi_conn *)data; |
7996a778 MC |
1787 | struct iscsi_session *session = conn->session; |
1788 | ||
659743b0 | 1789 | spin_lock(&session->frwd_lock); |
843c0a8a MC |
1790 | if (conn->tmf_state == TMF_QUEUED) { |
1791 | conn->tmf_state = TMF_TIMEDOUT; | |
bd2199d4 | 1792 | ISCSI_DBG_EH(session, "tmf timedout\n"); |
7996a778 MC |
1793 | /* unblock eh_abort() */ |
1794 | wake_up(&conn->ehwait); | |
1795 | } | |
659743b0 | 1796 | spin_unlock(&session->frwd_lock); |
7996a778 MC |
1797 | } |
1798 | ||
9c19a7d0 | 1799 | static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn, |
f6d5180c MC |
1800 | struct iscsi_tm *hdr, int age, |
1801 | int timeout) | |
7996a778 | 1802 | { |
7996a778 | 1803 | struct iscsi_session *session = conn->session; |
9c19a7d0 | 1804 | struct iscsi_task *task; |
7996a778 | 1805 | |
9c19a7d0 | 1806 | task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr, |
843c0a8a | 1807 | NULL, 0); |
9c19a7d0 | 1808 | if (!task) { |
659743b0 | 1809 | spin_unlock_bh(&session->frwd_lock); |
df4da5cd | 1810 | iscsi_conn_printk(KERN_ERR, conn, "Could not send TMF.\n"); |
7996a778 | 1811 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
659743b0 | 1812 | spin_lock_bh(&session->frwd_lock); |
77a23c21 | 1813 | return -EPERM; |
7996a778 | 1814 | } |
843c0a8a | 1815 | conn->tmfcmd_pdus_cnt++; |
f6d5180c | 1816 | conn->tmf_timer.expires = timeout * HZ + jiffies; |
843c0a8a MC |
1817 | conn->tmf_timer.function = iscsi_tmf_timedout; |
1818 | conn->tmf_timer.data = (unsigned long)conn; | |
1819 | add_timer(&conn->tmf_timer); | |
bd2199d4 | 1820 | ISCSI_DBG_EH(session, "tmf set timeout\n"); |
7996a778 | 1821 | |
659743b0 | 1822 | spin_unlock_bh(&session->frwd_lock); |
6724add1 | 1823 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1824 | |
1825 | /* | |
1826 | * block eh thread until: | |
1827 | * | |
843c0a8a MC |
1828 | * 1) tmf response |
1829 | * 2) tmf timeout | |
7996a778 MC |
1830 | * 3) session is terminated or restarted or userspace has |
1831 | * given up on recovery | |
1832 | */ | |
843c0a8a | 1833 | wait_event_interruptible(conn->ehwait, age != session->age || |
7996a778 | 1834 | session->state != ISCSI_STATE_LOGGED_IN || |
843c0a8a | 1835 | conn->tmf_state != TMF_QUEUED); |
7996a778 MC |
1836 | if (signal_pending(current)) |
1837 | flush_signals(current); | |
843c0a8a MC |
1838 | del_timer_sync(&conn->tmf_timer); |
1839 | ||
6724add1 | 1840 | mutex_lock(&session->eh_mutex); |
659743b0 | 1841 | spin_lock_bh(&session->frwd_lock); |
9c19a7d0 | 1842 | /* if the session drops it will clean up the task */ |
843c0a8a MC |
1843 | if (age != session->age || |
1844 | session->state != ISCSI_STATE_LOGGED_IN) | |
1845 | return -ENOTCONN; | |
7996a778 MC |
1846 | return 0; |
1847 | } | |
1848 | ||
843c0a8a MC |
1849 | /* |
1850 | * Fail commands. session lock held and recv side suspended and xmit | |
1851 | * thread flushed | |
1852 | */ | |
9cb78c16 | 1853 | static void fail_scsi_tasks(struct iscsi_conn *conn, u64 lun, int error) |
843c0a8a | 1854 | { |
3bbaaad9 MC |
1855 | struct iscsi_task *task; |
1856 | int i; | |
843c0a8a | 1857 | |
3bbaaad9 MC |
1858 | for (i = 0; i < conn->session->cmds_max; i++) { |
1859 | task = conn->session->cmds[i]; | |
1860 | if (!task->sc || task->state == ISCSI_TASK_FREE) | |
1861 | continue; | |
843c0a8a | 1862 | |
3bbaaad9 MC |
1863 | if (lun != -1 && lun != task->sc->device->lun) |
1864 | continue; | |
843c0a8a | 1865 | |
3bbaaad9 MC |
1866 | ISCSI_DBG_SESSION(conn->session, |
1867 | "failing sc %p itt 0x%x state %d\n", | |
1868 | task->sc, task->itt, task->state); | |
b3cd5050 | 1869 | fail_scsi_task(task, error); |
843c0a8a MC |
1870 | } |
1871 | } | |
1872 | ||
661134ad MC |
1873 | /** |
1874 | * iscsi_suspend_queue - suspend iscsi_queuecommand | |
1875 | * @conn: iscsi conn to stop queueing IO on | |
1876 | * | |
659743b0 | 1877 | * This grabs the session frwd_lock to make sure no one is in |
661134ad MC |
1878 | * xmit_task/queuecommand, and then sets suspend to prevent |
1879 | * new commands from being queued. This only needs to be called | |
1880 | * by offload drivers that need to sync a path like ep disconnect | |
1881 | * with the iscsi_queuecommand/xmit_task. To start IO again libiscsi | |
1882 | * will call iscsi_start_tx and iscsi_unblock_session when in FFP. | |
1883 | */ | |
1884 | void iscsi_suspend_queue(struct iscsi_conn *conn) | |
1885 | { | |
659743b0 | 1886 | spin_lock_bh(&conn->session->frwd_lock); |
661134ad | 1887 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); |
659743b0 | 1888 | spin_unlock_bh(&conn->session->frwd_lock); |
661134ad MC |
1889 | } |
1890 | EXPORT_SYMBOL_GPL(iscsi_suspend_queue); | |
1891 | ||
1892 | /** | |
1893 | * iscsi_suspend_tx - suspend iscsi_data_xmit | |
1894 | * @conn: iscsi conn tp stop processing IO on. | |
1895 | * | |
1896 | * This function sets the suspend bit to prevent iscsi_data_xmit | |
1897 | * from sending new IO, and if work is queued on the xmit thread | |
1898 | * it will wait for it to be completed. | |
1899 | */ | |
b40977d9 | 1900 | void iscsi_suspend_tx(struct iscsi_conn *conn) |
6724add1 | 1901 | { |
32ae763e MC |
1902 | struct Scsi_Host *shost = conn->session->host; |
1903 | struct iscsi_host *ihost = shost_priv(shost); | |
1904 | ||
6724add1 | 1905 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); |
1336aed1 | 1906 | if (ihost->workq) |
32ae763e | 1907 | flush_workqueue(ihost->workq); |
6724add1 | 1908 | } |
b40977d9 | 1909 | EXPORT_SYMBOL_GPL(iscsi_suspend_tx); |
6724add1 MC |
1910 | |
1911 | static void iscsi_start_tx(struct iscsi_conn *conn) | |
1912 | { | |
1913 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
1336aed1 | 1914 | iscsi_conn_queue_work(conn); |
6724add1 MC |
1915 | } |
1916 | ||
4c48a829 MC |
1917 | /* |
1918 | * We want to make sure a ping is in flight. It has timed out. | |
1919 | * And we are not busy processing a pdu that is making | |
1920 | * progress but got started before the ping and is taking a while | |
1921 | * to complete so the ping is just stuck behind it in a queue. | |
1922 | */ | |
1923 | static int iscsi_has_ping_timed_out(struct iscsi_conn *conn) | |
1924 | { | |
1925 | if (conn->ping_task && | |
1926 | time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) + | |
1927 | (conn->ping_timeout * HZ), jiffies)) | |
1928 | return 1; | |
1929 | else | |
1930 | return 0; | |
1931 | } | |
1932 | ||
d355e57d | 1933 | static enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *sc) |
f6d5180c | 1934 | { |
d355e57d | 1935 | enum blk_eh_timer_return rc = BLK_EH_NOT_HANDLED; |
92ed4d69 | 1936 | struct iscsi_task *task = NULL, *running_task; |
f6d5180c MC |
1937 | struct iscsi_cls_session *cls_session; |
1938 | struct iscsi_session *session; | |
1939 | struct iscsi_conn *conn; | |
92ed4d69 | 1940 | int i; |
f6d5180c | 1941 | |
d355e57d | 1942 | cls_session = starget_to_session(scsi_target(sc->device)); |
75613521 | 1943 | session = cls_session->dd_data; |
f6d5180c | 1944 | |
bd2199d4 | 1945 | ISCSI_DBG_EH(session, "scsi cmd %p timedout\n", sc); |
f6d5180c | 1946 | |
659743b0 | 1947 | spin_lock(&session->frwd_lock); |
e3d338a5 MC |
1948 | task = (struct iscsi_task *)sc->SCp.ptr; |
1949 | if (!task) { | |
1950 | /* | |
1951 | * Raced with completion. Blk layer has taken ownership | |
1952 | * so let timeout code complete it now. | |
1953 | */ | |
1954 | rc = BLK_EH_HANDLED; | |
1955 | goto done; | |
1956 | } | |
1957 | ||
f6d5180c MC |
1958 | if (session->state != ISCSI_STATE_LOGGED_IN) { |
1959 | /* | |
1960 | * We are probably in the middle of iscsi recovery so let | |
1961 | * that complete and handle the error. | |
1962 | */ | |
242f9dcb | 1963 | rc = BLK_EH_RESET_TIMER; |
f6d5180c MC |
1964 | goto done; |
1965 | } | |
1966 | ||
1967 | conn = session->leadconn; | |
1968 | if (!conn) { | |
1969 | /* In the middle of shuting down */ | |
242f9dcb | 1970 | rc = BLK_EH_RESET_TIMER; |
f6d5180c MC |
1971 | goto done; |
1972 | } | |
1973 | ||
d355e57d MC |
1974 | /* |
1975 | * If we have sent (at least queued to the network layer) a pdu or | |
1976 | * recvd one for the task since the last timeout ask for | |
1977 | * more time. If on the next timeout we have not made progress | |
1978 | * we can check if it is the task or connection when we send the | |
1979 | * nop as a ping. | |
1980 | */ | |
92ed4d69 | 1981 | if (time_after(task->last_xfer, task->last_timeout)) { |
bd2199d4 EZ |
1982 | ISCSI_DBG_EH(session, "Command making progress. Asking " |
1983 | "scsi-ml for more time to complete. " | |
92ed4d69 | 1984 | "Last data xfer at %lu. Last timeout was at " |
bd2199d4 | 1985 | "%lu\n.", task->last_xfer, task->last_timeout); |
d355e57d MC |
1986 | task->have_checked_conn = false; |
1987 | rc = BLK_EH_RESET_TIMER; | |
1988 | goto done; | |
1989 | } | |
1990 | ||
f6d5180c MC |
1991 | if (!conn->recv_timeout && !conn->ping_timeout) |
1992 | goto done; | |
1993 | /* | |
1994 | * if the ping timedout then we are in the middle of cleaning up | |
1995 | * and can let the iscsi eh handle it | |
1996 | */ | |
4c48a829 | 1997 | if (iscsi_has_ping_timed_out(conn)) { |
242f9dcb | 1998 | rc = BLK_EH_RESET_TIMER; |
4c48a829 MC |
1999 | goto done; |
2000 | } | |
d355e57d | 2001 | |
92ed4d69 MC |
2002 | for (i = 0; i < conn->session->cmds_max; i++) { |
2003 | running_task = conn->session->cmds[i]; | |
2004 | if (!running_task->sc || running_task == task || | |
2005 | running_task->state != ISCSI_TASK_RUNNING) | |
2006 | continue; | |
2007 | ||
2008 | /* | |
2009 | * Only check if cmds started before this one have made | |
2010 | * progress, or this could never fail | |
2011 | */ | |
2012 | if (time_after(running_task->sc->jiffies_at_alloc, | |
2013 | task->sc->jiffies_at_alloc)) | |
2014 | continue; | |
2015 | ||
2016 | if (time_after(running_task->last_xfer, task->last_timeout)) { | |
2017 | /* | |
2018 | * This task has not made progress, but a task | |
2019 | * started before us has transferred data since | |
2020 | * we started/last-checked. We could be queueing | |
2021 | * too many tasks or the LU is bad. | |
2022 | * | |
2023 | * If the device is bad the cmds ahead of us on | |
2024 | * other devs will complete, and this loop will | |
2025 | * eventually fail starting the scsi eh. | |
2026 | */ | |
2027 | ISCSI_DBG_EH(session, "Command has not made progress " | |
2028 | "but commands ahead of it have. " | |
2029 | "Asking scsi-ml for more time to " | |
2030 | "complete. Our last xfer vs running task " | |
2031 | "last xfer %lu/%lu. Last check %lu.\n", | |
2032 | task->last_xfer, running_task->last_xfer, | |
2033 | task->last_timeout); | |
2034 | rc = BLK_EH_RESET_TIMER; | |
2035 | goto done; | |
2036 | } | |
2037 | } | |
2038 | ||
d355e57d MC |
2039 | /* Assumes nop timeout is shorter than scsi cmd timeout */ |
2040 | if (task->have_checked_conn) | |
2041 | goto done; | |
2042 | ||
f6d5180c | 2043 | /* |
d355e57d MC |
2044 | * Checking the transport already or nop from a cmd timeout still |
2045 | * running | |
f6d5180c | 2046 | */ |
d355e57d MC |
2047 | if (conn->ping_task) { |
2048 | task->have_checked_conn = true; | |
242f9dcb | 2049 | rc = BLK_EH_RESET_TIMER; |
4c48a829 MC |
2050 | goto done; |
2051 | } | |
2052 | ||
d355e57d MC |
2053 | /* Make sure there is a transport check done */ |
2054 | iscsi_send_nopout(conn, NULL); | |
2055 | task->have_checked_conn = true; | |
2056 | rc = BLK_EH_RESET_TIMER; | |
2057 | ||
f6d5180c | 2058 | done: |
d355e57d MC |
2059 | if (task) |
2060 | task->last_timeout = jiffies; | |
659743b0 | 2061 | spin_unlock(&session->frwd_lock); |
bd2199d4 EZ |
2062 | ISCSI_DBG_EH(session, "return %s\n", rc == BLK_EH_RESET_TIMER ? |
2063 | "timer reset" : "nh"); | |
f6d5180c MC |
2064 | return rc; |
2065 | } | |
2066 | ||
2067 | static void iscsi_check_transport_timeouts(unsigned long data) | |
2068 | { | |
2069 | struct iscsi_conn *conn = (struct iscsi_conn *)data; | |
2070 | struct iscsi_session *session = conn->session; | |
4cf10435 | 2071 | unsigned long recv_timeout, next_timeout = 0, last_recv; |
f6d5180c | 2072 | |
659743b0 | 2073 | spin_lock(&session->frwd_lock); |
f6d5180c MC |
2074 | if (session->state != ISCSI_STATE_LOGGED_IN) |
2075 | goto done; | |
2076 | ||
4cf10435 MC |
2077 | recv_timeout = conn->recv_timeout; |
2078 | if (!recv_timeout) | |
f6d5180c MC |
2079 | goto done; |
2080 | ||
4cf10435 | 2081 | recv_timeout *= HZ; |
f6d5180c | 2082 | last_recv = conn->last_recv; |
4c48a829 MC |
2083 | |
2084 | if (iscsi_has_ping_timed_out(conn)) { | |
322d739d | 2085 | iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs " |
4c48a829 MC |
2086 | "expired, recv timeout %d, last rx %lu, " |
2087 | "last ping %lu, now %lu\n", | |
2088 | conn->ping_timeout, conn->recv_timeout, | |
2089 | last_recv, conn->last_ping, jiffies); | |
659743b0 | 2090 | spin_unlock(&session->frwd_lock); |
09ff742c | 2091 | iscsi_conn_failure(conn, ISCSI_ERR_NOP_TIMEDOUT); |
f6d5180c MC |
2092 | return; |
2093 | } | |
2094 | ||
4cf10435 | 2095 | if (time_before_eq(last_recv + recv_timeout, jiffies)) { |
c8611f97 | 2096 | /* send a ping to try to provoke some traffic */ |
1b2c7af8 | 2097 | ISCSI_DBG_CONN(conn, "Sending nopout as ping\n"); |
c8611f97 | 2098 | iscsi_send_nopout(conn, NULL); |
4cf10435 | 2099 | next_timeout = conn->last_ping + (conn->ping_timeout * HZ); |
ad294e9c | 2100 | } else |
4cf10435 | 2101 | next_timeout = last_recv + recv_timeout; |
f6d5180c | 2102 | |
1b2c7af8 | 2103 | ISCSI_DBG_CONN(conn, "Setting next tmo %lu\n", next_timeout); |
ad294e9c | 2104 | mod_timer(&conn->transport_timer, next_timeout); |
f6d5180c | 2105 | done: |
659743b0 | 2106 | spin_unlock(&session->frwd_lock); |
f6d5180c MC |
2107 | } |
2108 | ||
9c19a7d0 | 2109 | static void iscsi_prep_abort_task_pdu(struct iscsi_task *task, |
843c0a8a MC |
2110 | struct iscsi_tm *hdr) |
2111 | { | |
2112 | memset(hdr, 0, sizeof(*hdr)); | |
2113 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
2114 | hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK; | |
2115 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
55bdabdf | 2116 | hdr->lun = task->lun; |
577577da MC |
2117 | hdr->rtt = task->hdr_itt; |
2118 | hdr->refcmdsn = task->cmdsn; | |
843c0a8a MC |
2119 | } |
2120 | ||
7996a778 MC |
2121 | int iscsi_eh_abort(struct scsi_cmnd *sc) |
2122 | { | |
75613521 MC |
2123 | struct iscsi_cls_session *cls_session; |
2124 | struct iscsi_session *session; | |
f47f2cf5 | 2125 | struct iscsi_conn *conn; |
9c19a7d0 | 2126 | struct iscsi_task *task; |
843c0a8a MC |
2127 | struct iscsi_tm *hdr; |
2128 | int rc, age; | |
7996a778 | 2129 | |
75613521 MC |
2130 | cls_session = starget_to_session(scsi_target(sc->device)); |
2131 | session = cls_session->dd_data; | |
2132 | ||
bd2199d4 | 2133 | ISCSI_DBG_EH(session, "aborting sc %p\n", sc); |
4421c9eb | 2134 | |
6724add1 | 2135 | mutex_lock(&session->eh_mutex); |
659743b0 | 2136 | spin_lock_bh(&session->frwd_lock); |
f47f2cf5 MC |
2137 | /* |
2138 | * if session was ISCSI_STATE_IN_RECOVERY then we may not have | |
2139 | * got the command. | |
2140 | */ | |
2141 | if (!sc->SCp.ptr) { | |
bd2199d4 EZ |
2142 | ISCSI_DBG_EH(session, "sc never reached iscsi layer or " |
2143 | "it completed.\n"); | |
659743b0 | 2144 | spin_unlock_bh(&session->frwd_lock); |
6724add1 | 2145 | mutex_unlock(&session->eh_mutex); |
f47f2cf5 MC |
2146 | return SUCCESS; |
2147 | } | |
2148 | ||
7996a778 MC |
2149 | /* |
2150 | * If we are not logged in or we have started a new session | |
2151 | * then let the host reset code handle this | |
2152 | */ | |
843c0a8a MC |
2153 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN || |
2154 | sc->SCp.phase != session->age) { | |
659743b0 | 2155 | spin_unlock_bh(&session->frwd_lock); |
843c0a8a | 2156 | mutex_unlock(&session->eh_mutex); |
bd2199d4 | 2157 | ISCSI_DBG_EH(session, "failing abort due to dropped " |
4421c9eb | 2158 | "session.\n"); |
843c0a8a MC |
2159 | return FAILED; |
2160 | } | |
2161 | ||
2162 | conn = session->leadconn; | |
2163 | conn->eh_abort_cnt++; | |
2164 | age = session->age; | |
2165 | ||
9c19a7d0 | 2166 | task = (struct iscsi_task *)sc->SCp.ptr; |
bd2199d4 EZ |
2167 | ISCSI_DBG_EH(session, "aborting [sc %p itt 0x%x]\n", |
2168 | sc, task->itt); | |
7996a778 | 2169 | |
9c19a7d0 MC |
2170 | /* task completed before time out */ |
2171 | if (!task->sc) { | |
bd2199d4 | 2172 | ISCSI_DBG_EH(session, "sc completed while abort in progress\n"); |
77a23c21 | 2173 | goto success; |
7ea8b828 | 2174 | } |
7996a778 | 2175 | |
9c19a7d0 | 2176 | if (task->state == ISCSI_TASK_PENDING) { |
b3cd5050 | 2177 | fail_scsi_task(task, DID_ABORT); |
77a23c21 MC |
2178 | goto success; |
2179 | } | |
7996a778 | 2180 | |
843c0a8a MC |
2181 | /* only have one tmf outstanding at a time */ |
2182 | if (conn->tmf_state != TMF_INITIAL) | |
7996a778 | 2183 | goto failed; |
843c0a8a | 2184 | conn->tmf_state = TMF_QUEUED; |
7996a778 | 2185 | |
843c0a8a | 2186 | hdr = &conn->tmhdr; |
9c19a7d0 | 2187 | iscsi_prep_abort_task_pdu(task, hdr); |
843c0a8a | 2188 | |
9c19a7d0 | 2189 | if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout)) { |
843c0a8a MC |
2190 | rc = FAILED; |
2191 | goto failed; | |
2192 | } | |
2193 | ||
2194 | switch (conn->tmf_state) { | |
2195 | case TMF_SUCCESS: | |
659743b0 | 2196 | spin_unlock_bh(&session->frwd_lock); |
913e5bf4 MC |
2197 | /* |
2198 | * stop tx side incase the target had sent a abort rsp but | |
2199 | * the initiator was still writing out data. | |
2200 | */ | |
6724add1 | 2201 | iscsi_suspend_tx(conn); |
77a23c21 | 2202 | /* |
913e5bf4 MC |
2203 | * we do not stop the recv side because targets have been |
2204 | * good and have never sent us a successful tmf response | |
2205 | * then sent more data for the cmd. | |
77a23c21 | 2206 | */ |
659743b0 | 2207 | spin_lock_bh(&session->frwd_lock); |
b3cd5050 | 2208 | fail_scsi_task(task, DID_ABORT); |
843c0a8a | 2209 | conn->tmf_state = TMF_INITIAL; |
5d12c05e | 2210 | memset(hdr, 0, sizeof(*hdr)); |
659743b0 | 2211 | spin_unlock_bh(&session->frwd_lock); |
6724add1 | 2212 | iscsi_start_tx(conn); |
77a23c21 | 2213 | goto success_unlocked; |
843c0a8a | 2214 | case TMF_TIMEDOUT: |
659743b0 | 2215 | spin_unlock_bh(&session->frwd_lock); |
df4da5cd | 2216 | iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); |
843c0a8a MC |
2217 | goto failed_unlocked; |
2218 | case TMF_NOT_FOUND: | |
2219 | if (!sc->SCp.ptr) { | |
2220 | conn->tmf_state = TMF_INITIAL; | |
5d12c05e | 2221 | memset(hdr, 0, sizeof(*hdr)); |
9c19a7d0 | 2222 | /* task completed before tmf abort response */ |
bd2199d4 EZ |
2223 | ISCSI_DBG_EH(session, "sc completed while abort in " |
2224 | "progress\n"); | |
77a23c21 | 2225 | goto success; |
7ea8b828 MC |
2226 | } |
2227 | /* fall through */ | |
2228 | default: | |
843c0a8a MC |
2229 | conn->tmf_state = TMF_INITIAL; |
2230 | goto failed; | |
7996a778 MC |
2231 | } |
2232 | ||
77a23c21 | 2233 | success: |
659743b0 | 2234 | spin_unlock_bh(&session->frwd_lock); |
77a23c21 | 2235 | success_unlocked: |
bd2199d4 EZ |
2236 | ISCSI_DBG_EH(session, "abort success [sc %p itt 0x%x]\n", |
2237 | sc, task->itt); | |
6724add1 | 2238 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
2239 | return SUCCESS; |
2240 | ||
2241 | failed: | |
659743b0 | 2242 | spin_unlock_bh(&session->frwd_lock); |
77a23c21 | 2243 | failed_unlocked: |
bd2199d4 EZ |
2244 | ISCSI_DBG_EH(session, "abort failed [sc %p itt 0x%x]\n", sc, |
2245 | task ? task->itt : 0); | |
6724add1 | 2246 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
2247 | return FAILED; |
2248 | } | |
2249 | EXPORT_SYMBOL_GPL(iscsi_eh_abort); | |
2250 | ||
843c0a8a MC |
2251 | static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr) |
2252 | { | |
2253 | memset(hdr, 0, sizeof(*hdr)); | |
2254 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
2255 | hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK; | |
2256 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
55bdabdf | 2257 | int_to_scsilun(sc->device->lun, &hdr->lun); |
f6d5180c | 2258 | hdr->rtt = RESERVED_ITT; |
843c0a8a MC |
2259 | } |
2260 | ||
2261 | int iscsi_eh_device_reset(struct scsi_cmnd *sc) | |
2262 | { | |
75613521 MC |
2263 | struct iscsi_cls_session *cls_session; |
2264 | struct iscsi_session *session; | |
843c0a8a MC |
2265 | struct iscsi_conn *conn; |
2266 | struct iscsi_tm *hdr; | |
2267 | int rc = FAILED; | |
2268 | ||
75613521 MC |
2269 | cls_session = starget_to_session(scsi_target(sc->device)); |
2270 | session = cls_session->dd_data; | |
2271 | ||
9cb78c16 HR |
2272 | ISCSI_DBG_EH(session, "LU Reset [sc %p lun %llu]\n", sc, |
2273 | sc->device->lun); | |
843c0a8a MC |
2274 | |
2275 | mutex_lock(&session->eh_mutex); | |
659743b0 | 2276 | spin_lock_bh(&session->frwd_lock); |
843c0a8a MC |
2277 | /* |
2278 | * Just check if we are not logged in. We cannot check for | |
2279 | * the phase because the reset could come from a ioctl. | |
2280 | */ | |
2281 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN) | |
2282 | goto unlock; | |
2283 | conn = session->leadconn; | |
2284 | ||
2285 | /* only have one tmf outstanding at a time */ | |
2286 | if (conn->tmf_state != TMF_INITIAL) | |
2287 | goto unlock; | |
2288 | conn->tmf_state = TMF_QUEUED; | |
2289 | ||
2290 | hdr = &conn->tmhdr; | |
2291 | iscsi_prep_lun_reset_pdu(sc, hdr); | |
2292 | ||
9c19a7d0 | 2293 | if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age, |
f6d5180c | 2294 | session->lu_reset_timeout)) { |
843c0a8a MC |
2295 | rc = FAILED; |
2296 | goto unlock; | |
2297 | } | |
2298 | ||
2299 | switch (conn->tmf_state) { | |
2300 | case TMF_SUCCESS: | |
2301 | break; | |
2302 | case TMF_TIMEDOUT: | |
659743b0 | 2303 | spin_unlock_bh(&session->frwd_lock); |
df4da5cd | 2304 | iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); |
843c0a8a MC |
2305 | goto done; |
2306 | default: | |
2307 | conn->tmf_state = TMF_INITIAL; | |
2308 | goto unlock; | |
2309 | } | |
2310 | ||
2311 | rc = SUCCESS; | |
659743b0 | 2312 | spin_unlock_bh(&session->frwd_lock); |
843c0a8a MC |
2313 | |
2314 | iscsi_suspend_tx(conn); | |
913e5bf4 | 2315 | |
659743b0 | 2316 | spin_lock_bh(&session->frwd_lock); |
5d12c05e | 2317 | memset(hdr, 0, sizeof(*hdr)); |
3bbaaad9 | 2318 | fail_scsi_tasks(conn, sc->device->lun, DID_ERROR); |
843c0a8a | 2319 | conn->tmf_state = TMF_INITIAL; |
659743b0 | 2320 | spin_unlock_bh(&session->frwd_lock); |
843c0a8a MC |
2321 | |
2322 | iscsi_start_tx(conn); | |
2323 | goto done; | |
2324 | ||
2325 | unlock: | |
659743b0 | 2326 | spin_unlock_bh(&session->frwd_lock); |
843c0a8a | 2327 | done: |
bd2199d4 EZ |
2328 | ISCSI_DBG_EH(session, "dev reset result = %s\n", |
2329 | rc == SUCCESS ? "SUCCESS" : "FAILED"); | |
843c0a8a MC |
2330 | mutex_unlock(&session->eh_mutex); |
2331 | return rc; | |
2332 | } | |
2333 | EXPORT_SYMBOL_GPL(iscsi_eh_device_reset); | |
2334 | ||
3fe5ae8b MC |
2335 | void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session) |
2336 | { | |
2337 | struct iscsi_session *session = cls_session->dd_data; | |
2338 | ||
659743b0 | 2339 | spin_lock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2340 | if (session->state != ISCSI_STATE_LOGGED_IN) { |
2341 | session->state = ISCSI_STATE_RECOVERY_FAILED; | |
2342 | if (session->leadconn) | |
2343 | wake_up(&session->leadconn->ehwait); | |
2344 | } | |
659743b0 | 2345 | spin_unlock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2346 | } |
2347 | EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout); | |
2348 | ||
2349 | /** | |
2350 | * iscsi_eh_session_reset - drop session and attempt relogin | |
2351 | * @sc: scsi command | |
2352 | * | |
2353 | * This function will wait for a relogin, session termination from | |
2354 | * userspace, or a recovery/replacement timeout. | |
2355 | */ | |
309ce156 | 2356 | int iscsi_eh_session_reset(struct scsi_cmnd *sc) |
3fe5ae8b MC |
2357 | { |
2358 | struct iscsi_cls_session *cls_session; | |
2359 | struct iscsi_session *session; | |
2360 | struct iscsi_conn *conn; | |
2361 | ||
2362 | cls_session = starget_to_session(scsi_target(sc->device)); | |
2363 | session = cls_session->dd_data; | |
2364 | conn = session->leadconn; | |
2365 | ||
2366 | mutex_lock(&session->eh_mutex); | |
659743b0 | 2367 | spin_lock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2368 | if (session->state == ISCSI_STATE_TERMINATE) { |
2369 | failed: | |
2370 | ISCSI_DBG_EH(session, | |
2371 | "failing session reset: Could not log back into " | |
2372 | "%s, %s [age %d]\n", session->targetname, | |
2373 | conn->persistent_address, session->age); | |
659743b0 | 2374 | spin_unlock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2375 | mutex_unlock(&session->eh_mutex); |
2376 | return FAILED; | |
2377 | } | |
2378 | ||
659743b0 | 2379 | spin_unlock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2380 | mutex_unlock(&session->eh_mutex); |
2381 | /* | |
2382 | * we drop the lock here but the leadconn cannot be destoyed while | |
2383 | * we are in the scsi eh | |
2384 | */ | |
df4da5cd | 2385 | iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); |
3fe5ae8b MC |
2386 | |
2387 | ISCSI_DBG_EH(session, "wait for relogin\n"); | |
2388 | wait_event_interruptible(conn->ehwait, | |
2389 | session->state == ISCSI_STATE_TERMINATE || | |
2390 | session->state == ISCSI_STATE_LOGGED_IN || | |
2391 | session->state == ISCSI_STATE_RECOVERY_FAILED); | |
2392 | if (signal_pending(current)) | |
2393 | flush_signals(current); | |
2394 | ||
2395 | mutex_lock(&session->eh_mutex); | |
659743b0 | 2396 | spin_lock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2397 | if (session->state == ISCSI_STATE_LOGGED_IN) { |
2398 | ISCSI_DBG_EH(session, | |
2399 | "session reset succeeded for %s,%s\n", | |
2400 | session->targetname, conn->persistent_address); | |
2401 | } else | |
2402 | goto failed; | |
659743b0 | 2403 | spin_unlock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2404 | mutex_unlock(&session->eh_mutex); |
2405 | return SUCCESS; | |
2406 | } | |
309ce156 | 2407 | EXPORT_SYMBOL_GPL(iscsi_eh_session_reset); |
3fe5ae8b MC |
2408 | |
2409 | static void iscsi_prep_tgt_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr) | |
2410 | { | |
2411 | memset(hdr, 0, sizeof(*hdr)); | |
2412 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
2413 | hdr->flags = ISCSI_TM_FUNC_TARGET_WARM_RESET & ISCSI_FLAG_TM_FUNC_MASK; | |
2414 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
2415 | hdr->rtt = RESERVED_ITT; | |
2416 | } | |
2417 | ||
2418 | /** | |
2419 | * iscsi_eh_target_reset - reset target | |
2420 | * @sc: scsi command | |
2421 | * | |
309ce156 | 2422 | * This will attempt to send a warm target reset. |
3fe5ae8b MC |
2423 | */ |
2424 | int iscsi_eh_target_reset(struct scsi_cmnd *sc) | |
2425 | { | |
2426 | struct iscsi_cls_session *cls_session; | |
2427 | struct iscsi_session *session; | |
2428 | struct iscsi_conn *conn; | |
2429 | struct iscsi_tm *hdr; | |
2430 | int rc = FAILED; | |
2431 | ||
2432 | cls_session = starget_to_session(scsi_target(sc->device)); | |
2433 | session = cls_session->dd_data; | |
2434 | ||
2435 | ISCSI_DBG_EH(session, "tgt Reset [sc %p tgt %s]\n", sc, | |
2436 | session->targetname); | |
2437 | ||
2438 | mutex_lock(&session->eh_mutex); | |
659743b0 | 2439 | spin_lock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2440 | /* |
2441 | * Just check if we are not logged in. We cannot check for | |
2442 | * the phase because the reset could come from a ioctl. | |
2443 | */ | |
2444 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN) | |
2445 | goto unlock; | |
2446 | conn = session->leadconn; | |
2447 | ||
2448 | /* only have one tmf outstanding at a time */ | |
2449 | if (conn->tmf_state != TMF_INITIAL) | |
2450 | goto unlock; | |
2451 | conn->tmf_state = TMF_QUEUED; | |
2452 | ||
2453 | hdr = &conn->tmhdr; | |
2454 | iscsi_prep_tgt_reset_pdu(sc, hdr); | |
2455 | ||
2456 | if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age, | |
2457 | session->tgt_reset_timeout)) { | |
2458 | rc = FAILED; | |
2459 | goto unlock; | |
2460 | } | |
2461 | ||
2462 | switch (conn->tmf_state) { | |
2463 | case TMF_SUCCESS: | |
2464 | break; | |
2465 | case TMF_TIMEDOUT: | |
659743b0 | 2466 | spin_unlock_bh(&session->frwd_lock); |
df4da5cd | 2467 | iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); |
3fe5ae8b MC |
2468 | goto done; |
2469 | default: | |
2470 | conn->tmf_state = TMF_INITIAL; | |
2471 | goto unlock; | |
2472 | } | |
2473 | ||
2474 | rc = SUCCESS; | |
659743b0 | 2475 | spin_unlock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2476 | |
2477 | iscsi_suspend_tx(conn); | |
2478 | ||
659743b0 | 2479 | spin_lock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2480 | memset(hdr, 0, sizeof(*hdr)); |
2481 | fail_scsi_tasks(conn, -1, DID_ERROR); | |
2482 | conn->tmf_state = TMF_INITIAL; | |
659743b0 | 2483 | spin_unlock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2484 | |
2485 | iscsi_start_tx(conn); | |
2486 | goto done; | |
2487 | ||
2488 | unlock: | |
659743b0 | 2489 | spin_unlock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2490 | done: |
2491 | ISCSI_DBG_EH(session, "tgt %s reset result = %s\n", session->targetname, | |
2492 | rc == SUCCESS ? "SUCCESS" : "FAILED"); | |
2493 | mutex_unlock(&session->eh_mutex); | |
309ce156 JK |
2494 | return rc; |
2495 | } | |
2496 | EXPORT_SYMBOL_GPL(iscsi_eh_target_reset); | |
3fe5ae8b | 2497 | |
309ce156 JK |
2498 | /** |
2499 | * iscsi_eh_recover_target - reset target and possibly the session | |
2500 | * @sc: scsi command | |
2501 | * | |
2502 | * This will attempt to send a warm target reset. If that fails, | |
2503 | * we will escalate to ERL0 session recovery. | |
2504 | */ | |
2505 | int iscsi_eh_recover_target(struct scsi_cmnd *sc) | |
2506 | { | |
2507 | int rc; | |
2508 | ||
2509 | rc = iscsi_eh_target_reset(sc); | |
3fe5ae8b MC |
2510 | if (rc == FAILED) |
2511 | rc = iscsi_eh_session_reset(sc); | |
2512 | return rc; | |
2513 | } | |
309ce156 | 2514 | EXPORT_SYMBOL_GPL(iscsi_eh_recover_target); |
3fe5ae8b | 2515 | |
6320377f OK |
2516 | /* |
2517 | * Pre-allocate a pool of @max items of @item_size. By default, the pool | |
2518 | * should be accessed via kfifo_{get,put} on q->queue. | |
2519 | * Optionally, the caller can obtain the array of object pointers | |
2520 | * by passing in a non-NULL @items pointer | |
2521 | */ | |
7996a778 | 2522 | int |
6320377f | 2523 | iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size) |
7996a778 | 2524 | { |
6320377f | 2525 | int i, num_arrays = 1; |
7996a778 | 2526 | |
6320377f | 2527 | memset(q, 0, sizeof(*q)); |
7996a778 MC |
2528 | |
2529 | q->max = max; | |
6320377f OK |
2530 | |
2531 | /* If the user passed an items pointer, he wants a copy of | |
2532 | * the array. */ | |
2533 | if (items) | |
2534 | num_arrays++; | |
2535 | q->pool = kzalloc(num_arrays * max * sizeof(void*), GFP_KERNEL); | |
2536 | if (q->pool == NULL) | |
f474a37b | 2537 | return -ENOMEM; |
7996a778 | 2538 | |
c1e13f25 | 2539 | kfifo_init(&q->queue, (void*)q->pool, max * sizeof(void*)); |
7996a778 MC |
2540 | |
2541 | for (i = 0; i < max; i++) { | |
6320377f | 2542 | q->pool[i] = kzalloc(item_size, GFP_KERNEL); |
7996a778 | 2543 | if (q->pool[i] == NULL) { |
6320377f OK |
2544 | q->max = i; |
2545 | goto enomem; | |
7996a778 | 2546 | } |
7acd72eb | 2547 | kfifo_in(&q->queue, (void*)&q->pool[i], sizeof(void*)); |
7996a778 | 2548 | } |
6320377f OK |
2549 | |
2550 | if (items) { | |
2551 | *items = q->pool + max; | |
2552 | memcpy(*items, q->pool, max * sizeof(void *)); | |
2553 | } | |
2554 | ||
7996a778 | 2555 | return 0; |
6320377f OK |
2556 | |
2557 | enomem: | |
2558 | iscsi_pool_free(q); | |
2559 | return -ENOMEM; | |
7996a778 MC |
2560 | } |
2561 | EXPORT_SYMBOL_GPL(iscsi_pool_init); | |
2562 | ||
6320377f | 2563 | void iscsi_pool_free(struct iscsi_pool *q) |
7996a778 MC |
2564 | { |
2565 | int i; | |
2566 | ||
2567 | for (i = 0; i < q->max; i++) | |
6320377f | 2568 | kfree(q->pool[i]); |
f474a37b | 2569 | kfree(q->pool); |
7996a778 MC |
2570 | } |
2571 | EXPORT_SYMBOL_GPL(iscsi_pool_free); | |
2572 | ||
a4804cd6 MC |
2573 | /** |
2574 | * iscsi_host_add - add host to system | |
2575 | * @shost: scsi host | |
2576 | * @pdev: parent device | |
2577 | * | |
2578 | * This should be called by partial offload and software iscsi drivers | |
2579 | * to add a host to the system. | |
2580 | */ | |
2581 | int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev) | |
2582 | { | |
8e9a20ce MC |
2583 | if (!shost->can_queue) |
2584 | shost->can_queue = ISCSI_DEF_XMIT_CMDS_MAX; | |
2585 | ||
4d108350 MC |
2586 | if (!shost->cmd_per_lun) |
2587 | shost->cmd_per_lun = ISCSI_DEF_CMD_PER_LUN; | |
2588 | ||
308cec14 MC |
2589 | if (!shost->transportt->eh_timed_out) |
2590 | shost->transportt->eh_timed_out = iscsi_eh_cmd_timed_out; | |
a4804cd6 MC |
2591 | return scsi_add_host(shost, pdev); |
2592 | } | |
2593 | EXPORT_SYMBOL_GPL(iscsi_host_add); | |
2594 | ||
2595 | /** | |
2596 | * iscsi_host_alloc - allocate a host and driver data | |
2597 | * @sht: scsi host template | |
2598 | * @dd_data_size: driver host data size | |
32ae763e | 2599 | * @xmit_can_sleep: bool indicating if LLD will queue IO from a work queue |
a4804cd6 MC |
2600 | * |
2601 | * This should be called by partial offload and software iscsi drivers. | |
2602 | * To access the driver specific memory use the iscsi_host_priv() macro. | |
2603 | */ | |
2604 | struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht, | |
4d108350 | 2605 | int dd_data_size, bool xmit_can_sleep) |
75613521 | 2606 | { |
a4804cd6 | 2607 | struct Scsi_Host *shost; |
e5bd7b54 | 2608 | struct iscsi_host *ihost; |
a4804cd6 MC |
2609 | |
2610 | shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size); | |
2611 | if (!shost) | |
2612 | return NULL; | |
e5bd7b54 | 2613 | ihost = shost_priv(shost); |
32ae763e MC |
2614 | |
2615 | if (xmit_can_sleep) { | |
2616 | snprintf(ihost->workq_name, sizeof(ihost->workq_name), | |
2617 | "iscsi_q_%d", shost->host_no); | |
2618 | ihost->workq = create_singlethread_workqueue(ihost->workq_name); | |
2619 | if (!ihost->workq) | |
2620 | goto free_host; | |
2621 | } | |
2622 | ||
e5bd7b54 MC |
2623 | spin_lock_init(&ihost->lock); |
2624 | ihost->state = ISCSI_HOST_SETUP; | |
2625 | ihost->num_sessions = 0; | |
2626 | init_waitqueue_head(&ihost->session_removal_wq); | |
a4804cd6 | 2627 | return shost; |
32ae763e MC |
2628 | |
2629 | free_host: | |
2630 | scsi_host_put(shost); | |
2631 | return NULL; | |
a4804cd6 MC |
2632 | } |
2633 | EXPORT_SYMBOL_GPL(iscsi_host_alloc); | |
2634 | ||
e5bd7b54 MC |
2635 | static void iscsi_notify_host_removed(struct iscsi_cls_session *cls_session) |
2636 | { | |
40a06e75 | 2637 | iscsi_session_failure(cls_session->dd_data, ISCSI_ERR_INVALID_HOST); |
e5bd7b54 MC |
2638 | } |
2639 | ||
a4804cd6 MC |
2640 | /** |
2641 | * iscsi_host_remove - remove host and sessions | |
2642 | * @shost: scsi host | |
2643 | * | |
e5bd7b54 MC |
2644 | * If there are any sessions left, this will initiate the removal and wait |
2645 | * for the completion. | |
a4804cd6 MC |
2646 | */ |
2647 | void iscsi_host_remove(struct Scsi_Host *shost) | |
2648 | { | |
e5bd7b54 MC |
2649 | struct iscsi_host *ihost = shost_priv(shost); |
2650 | unsigned long flags; | |
2651 | ||
2652 | spin_lock_irqsave(&ihost->lock, flags); | |
2653 | ihost->state = ISCSI_HOST_REMOVED; | |
2654 | spin_unlock_irqrestore(&ihost->lock, flags); | |
2655 | ||
2656 | iscsi_host_for_each_session(shost, iscsi_notify_host_removed); | |
2657 | wait_event_interruptible(ihost->session_removal_wq, | |
2658 | ihost->num_sessions == 0); | |
2659 | if (signal_pending(current)) | |
2660 | flush_signals(current); | |
2661 | ||
a4804cd6 | 2662 | scsi_remove_host(shost); |
32ae763e MC |
2663 | if (ihost->workq) |
2664 | destroy_workqueue(ihost->workq); | |
75613521 | 2665 | } |
a4804cd6 | 2666 | EXPORT_SYMBOL_GPL(iscsi_host_remove); |
7996a778 | 2667 | |
a4804cd6 | 2668 | void iscsi_host_free(struct Scsi_Host *shost) |
75613521 MC |
2669 | { |
2670 | struct iscsi_host *ihost = shost_priv(shost); | |
7996a778 | 2671 | |
75613521 MC |
2672 | kfree(ihost->netdev); |
2673 | kfree(ihost->hwaddress); | |
2674 | kfree(ihost->initiatorname); | |
a4804cd6 | 2675 | scsi_host_put(shost); |
75613521 | 2676 | } |
a4804cd6 | 2677 | EXPORT_SYMBOL_GPL(iscsi_host_free); |
7996a778 | 2678 | |
e5bd7b54 MC |
2679 | static void iscsi_host_dec_session_cnt(struct Scsi_Host *shost) |
2680 | { | |
2681 | struct iscsi_host *ihost = shost_priv(shost); | |
2682 | unsigned long flags; | |
2683 | ||
2684 | shost = scsi_host_get(shost); | |
2685 | if (!shost) { | |
2686 | printk(KERN_ERR "Invalid state. Cannot notify host removal " | |
2687 | "of session teardown event because host already " | |
2688 | "removed.\n"); | |
2689 | return; | |
2690 | } | |
2691 | ||
2692 | spin_lock_irqsave(&ihost->lock, flags); | |
2693 | ihost->num_sessions--; | |
2694 | if (ihost->num_sessions == 0) | |
2695 | wake_up(&ihost->session_removal_wq); | |
2696 | spin_unlock_irqrestore(&ihost->lock, flags); | |
2697 | scsi_host_put(shost); | |
2698 | } | |
2699 | ||
7996a778 MC |
2700 | /** |
2701 | * iscsi_session_setup - create iscsi cls session and host and session | |
7996a778 | 2702 | * @iscsit: iscsi transport template |
75613521 MC |
2703 | * @shost: scsi host |
2704 | * @cmds_max: session can queue | |
9c19a7d0 | 2705 | * @cmd_task_size: LLD task private data size |
7996a778 | 2706 | * @initial_cmdsn: initial CmdSN |
7996a778 MC |
2707 | * |
2708 | * This can be used by software iscsi_transports that allocate | |
2709 | * a session per scsi host. | |
3cf7b233 MC |
2710 | * |
2711 | * Callers should set cmds_max to the largest total numer (mgmt + scsi) of | |
2712 | * tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks | |
2713 | * for nop handling and login/logout requests. | |
75613521 | 2714 | */ |
7996a778 | 2715 | struct iscsi_cls_session * |
75613521 | 2716 | iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost, |
b8b9e1b8 | 2717 | uint16_t cmds_max, int dd_size, int cmd_task_size, |
7970634b | 2718 | uint32_t initial_cmdsn, unsigned int id) |
7996a778 | 2719 | { |
e5bd7b54 | 2720 | struct iscsi_host *ihost = shost_priv(shost); |
7996a778 MC |
2721 | struct iscsi_session *session; |
2722 | struct iscsi_cls_session *cls_session; | |
3cf7b233 | 2723 | int cmd_i, scsi_cmds, total_cmds = cmds_max; |
e5bd7b54 MC |
2724 | unsigned long flags; |
2725 | ||
2726 | spin_lock_irqsave(&ihost->lock, flags); | |
2727 | if (ihost->state == ISCSI_HOST_REMOVED) { | |
2728 | spin_unlock_irqrestore(&ihost->lock, flags); | |
2729 | return NULL; | |
2730 | } | |
2731 | ihost->num_sessions++; | |
2732 | spin_unlock_irqrestore(&ihost->lock, flags); | |
8e9a20ce MC |
2733 | |
2734 | if (!total_cmds) | |
2735 | total_cmds = ISCSI_DEF_XMIT_CMDS_MAX; | |
3e5c28ad | 2736 | /* |
3cf7b233 MC |
2737 | * The iscsi layer needs some tasks for nop handling and tmfs, |
2738 | * so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX | |
2739 | * + 1 command for scsi IO. | |
3e5c28ad | 2740 | */ |
3cf7b233 MC |
2741 | if (total_cmds < ISCSI_TOTAL_CMDS_MIN) { |
2742 | printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " | |
2743 | "must be a power of two that is at least %d.\n", | |
2744 | total_cmds, ISCSI_TOTAL_CMDS_MIN); | |
e5bd7b54 | 2745 | goto dec_session_count; |
3cf7b233 MC |
2746 | } |
2747 | ||
2748 | if (total_cmds > ISCSI_TOTAL_CMDS_MAX) { | |
2749 | printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " | |
2750 | "must be a power of 2 less than or equal to %d.\n", | |
2751 | cmds_max, ISCSI_TOTAL_CMDS_MAX); | |
2752 | total_cmds = ISCSI_TOTAL_CMDS_MAX; | |
2753 | } | |
2754 | ||
2755 | if (!is_power_of_2(total_cmds)) { | |
2756 | printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " | |
2757 | "must be a power of 2.\n", total_cmds); | |
2758 | total_cmds = rounddown_pow_of_two(total_cmds); | |
2759 | if (total_cmds < ISCSI_TOTAL_CMDS_MIN) | |
2760 | return NULL; | |
2761 | printk(KERN_INFO "iscsi: Rounding can_queue to %d.\n", | |
2762 | total_cmds); | |
1548271e | 2763 | } |
3cf7b233 | 2764 | scsi_cmds = total_cmds - ISCSI_MGMT_CMDS_MAX; |
1548271e | 2765 | |
5d91e209 | 2766 | cls_session = iscsi_alloc_session(shost, iscsit, |
b8b9e1b8 JK |
2767 | sizeof(struct iscsi_session) + |
2768 | dd_size); | |
75613521 | 2769 | if (!cls_session) |
e5bd7b54 | 2770 | goto dec_session_count; |
75613521 MC |
2771 | session = cls_session->dd_data; |
2772 | session->cls_session = cls_session; | |
7996a778 MC |
2773 | session->host = shost; |
2774 | session->state = ISCSI_STATE_FREE; | |
f6d5180c | 2775 | session->fast_abort = 1; |
3fe5ae8b | 2776 | session->tgt_reset_timeout = 30; |
4cd49ea1 MC |
2777 | session->lu_reset_timeout = 15; |
2778 | session->abort_timeout = 10; | |
3cf7b233 MC |
2779 | session->scsi_cmds_max = scsi_cmds; |
2780 | session->cmds_max = total_cmds; | |
e0726407 | 2781 | session->queued_cmdsn = session->cmdsn = initial_cmdsn; |
7996a778 MC |
2782 | session->exp_cmdsn = initial_cmdsn + 1; |
2783 | session->max_cmdsn = initial_cmdsn + 1; | |
2784 | session->max_r2t = 1; | |
2785 | session->tt = iscsit; | |
b8b9e1b8 | 2786 | session->dd_data = cls_session->dd_data + sizeof(*session); |
659743b0 | 2787 | |
6724add1 | 2788 | mutex_init(&session->eh_mutex); |
659743b0 SP |
2789 | spin_lock_init(&session->frwd_lock); |
2790 | spin_lock_init(&session->back_lock); | |
7996a778 MC |
2791 | |
2792 | /* initialize SCSI PDU commands pool */ | |
2793 | if (iscsi_pool_init(&session->cmdpool, session->cmds_max, | |
2794 | (void***)&session->cmds, | |
9c19a7d0 | 2795 | cmd_task_size + sizeof(struct iscsi_task))) |
7996a778 MC |
2796 | goto cmdpool_alloc_fail; |
2797 | ||
2798 | /* pre-format cmds pool with ITT */ | |
2799 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
9c19a7d0 | 2800 | struct iscsi_task *task = session->cmds[cmd_i]; |
7996a778 | 2801 | |
9c19a7d0 MC |
2802 | if (cmd_task_size) |
2803 | task->dd_data = &task[1]; | |
2804 | task->itt = cmd_i; | |
3bbaaad9 | 2805 | task->state = ISCSI_TASK_FREE; |
9c19a7d0 | 2806 | INIT_LIST_HEAD(&task->running); |
7996a778 MC |
2807 | } |
2808 | ||
f53a88da | 2809 | if (!try_module_get(iscsit->owner)) |
75613521 | 2810 | goto module_get_fail; |
7996a778 | 2811 | |
7970634b | 2812 | if (iscsi_add_session(cls_session, id)) |
75613521 | 2813 | goto cls_session_fail; |
e5bd7b54 | 2814 | |
7996a778 MC |
2815 | return cls_session; |
2816 | ||
2817 | cls_session_fail: | |
75613521 MC |
2818 | module_put(iscsit->owner); |
2819 | module_get_fail: | |
6320377f | 2820 | iscsi_pool_free(&session->cmdpool); |
7996a778 | 2821 | cmdpool_alloc_fail: |
75613521 | 2822 | iscsi_free_session(cls_session); |
e5bd7b54 MC |
2823 | dec_session_count: |
2824 | iscsi_host_dec_session_cnt(shost); | |
7996a778 MC |
2825 | return NULL; |
2826 | } | |
2827 | EXPORT_SYMBOL_GPL(iscsi_session_setup); | |
2828 | ||
2829 | /** | |
2830 | * iscsi_session_teardown - destroy session, host, and cls_session | |
75613521 | 2831 | * @cls_session: iscsi session |
7996a778 | 2832 | * |
75613521 MC |
2833 | * The driver must have called iscsi_remove_session before |
2834 | * calling this. | |
2835 | */ | |
7996a778 MC |
2836 | void iscsi_session_teardown(struct iscsi_cls_session *cls_session) |
2837 | { | |
75613521 | 2838 | struct iscsi_session *session = cls_session->dd_data; |
63f75cc8 | 2839 | struct module *owner = cls_session->transport->owner; |
e5bd7b54 | 2840 | struct Scsi_Host *shost = session->host; |
7996a778 | 2841 | |
6320377f | 2842 | iscsi_pool_free(&session->cmdpool); |
7996a778 | 2843 | |
b2c64167 MC |
2844 | kfree(session->password); |
2845 | kfree(session->password_in); | |
2846 | kfree(session->username); | |
2847 | kfree(session->username_in); | |
f3ff0c36 | 2848 | kfree(session->targetname); |
3c5c4801 | 2849 | kfree(session->targetalias); |
88dfd340 | 2850 | kfree(session->initiatorname); |
3b9373e9 EW |
2851 | kfree(session->boot_root); |
2852 | kfree(session->boot_nic); | |
2853 | kfree(session->boot_target); | |
88dfd340 | 2854 | kfree(session->ifacename); |
f8525eb4 AC |
2855 | kfree(session->portal_type); |
2856 | kfree(session->discovery_parent_type); | |
f3ff0c36 | 2857 | |
75613521 | 2858 | iscsi_destroy_session(cls_session); |
e5bd7b54 | 2859 | iscsi_host_dec_session_cnt(shost); |
63f75cc8 | 2860 | module_put(owner); |
7996a778 MC |
2861 | } |
2862 | EXPORT_SYMBOL_GPL(iscsi_session_teardown); | |
2863 | ||
2864 | /** | |
2865 | * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn | |
2866 | * @cls_session: iscsi_cls_session | |
5d91e209 | 2867 | * @dd_size: private driver data size |
7996a778 | 2868 | * @conn_idx: cid |
5d91e209 | 2869 | */ |
7996a778 | 2870 | struct iscsi_cls_conn * |
5d91e209 MC |
2871 | iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size, |
2872 | uint32_t conn_idx) | |
7996a778 | 2873 | { |
75613521 | 2874 | struct iscsi_session *session = cls_session->dd_data; |
7996a778 MC |
2875 | struct iscsi_conn *conn; |
2876 | struct iscsi_cls_conn *cls_conn; | |
d36ab6f3 | 2877 | char *data; |
7996a778 | 2878 | |
5d91e209 MC |
2879 | cls_conn = iscsi_create_conn(cls_session, sizeof(*conn) + dd_size, |
2880 | conn_idx); | |
7996a778 MC |
2881 | if (!cls_conn) |
2882 | return NULL; | |
2883 | conn = cls_conn->dd_data; | |
5d91e209 | 2884 | memset(conn, 0, sizeof(*conn) + dd_size); |
7996a778 | 2885 | |
5d91e209 | 2886 | conn->dd_data = cls_conn->dd_data + sizeof(*conn); |
7996a778 MC |
2887 | conn->session = session; |
2888 | conn->cls_conn = cls_conn; | |
2889 | conn->c_stage = ISCSI_CONN_INITIAL_STAGE; | |
2890 | conn->id = conn_idx; | |
2891 | conn->exp_statsn = 0; | |
843c0a8a | 2892 | conn->tmf_state = TMF_INITIAL; |
f6d5180c MC |
2893 | |
2894 | init_timer(&conn->transport_timer); | |
2895 | conn->transport_timer.data = (unsigned long)conn; | |
2896 | conn->transport_timer.function = iscsi_check_transport_timeouts; | |
2897 | ||
843c0a8a | 2898 | INIT_LIST_HEAD(&conn->mgmtqueue); |
3bbaaad9 | 2899 | INIT_LIST_HEAD(&conn->cmdqueue); |
843c0a8a | 2900 | INIT_LIST_HEAD(&conn->requeue); |
c4028958 | 2901 | INIT_WORK(&conn->xmitwork, iscsi_xmitworker); |
7996a778 | 2902 | |
9c19a7d0 | 2903 | /* allocate login_task used for the login/text sequences */ |
659743b0 | 2904 | spin_lock_bh(&session->frwd_lock); |
7acd72eb | 2905 | if (!kfifo_out(&session->cmdpool.queue, |
9c19a7d0 | 2906 | (void*)&conn->login_task, |
7996a778 | 2907 | sizeof(void*))) { |
659743b0 | 2908 | spin_unlock_bh(&session->frwd_lock); |
9c19a7d0 | 2909 | goto login_task_alloc_fail; |
7996a778 | 2910 | } |
659743b0 | 2911 | spin_unlock_bh(&session->frwd_lock); |
7996a778 | 2912 | |
cfeb2cf9 MC |
2913 | data = (char *) __get_free_pages(GFP_KERNEL, |
2914 | get_order(ISCSI_DEF_MAX_RECV_SEG_LEN)); | |
d36ab6f3 | 2915 | if (!data) |
9c19a7d0 MC |
2916 | goto login_task_data_alloc_fail; |
2917 | conn->login_task->data = conn->data = data; | |
d36ab6f3 | 2918 | |
843c0a8a | 2919 | init_timer(&conn->tmf_timer); |
7996a778 MC |
2920 | init_waitqueue_head(&conn->ehwait); |
2921 | ||
2922 | return cls_conn; | |
2923 | ||
9c19a7d0 | 2924 | login_task_data_alloc_fail: |
7acd72eb | 2925 | kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task, |
d36ab6f3 | 2926 | sizeof(void*)); |
9c19a7d0 | 2927 | login_task_alloc_fail: |
7996a778 MC |
2928 | iscsi_destroy_conn(cls_conn); |
2929 | return NULL; | |
2930 | } | |
2931 | EXPORT_SYMBOL_GPL(iscsi_conn_setup); | |
2932 | ||
2933 | /** | |
2934 | * iscsi_conn_teardown - teardown iscsi connection | |
2935 | * cls_conn: iscsi class connection | |
2936 | * | |
2937 | * TODO: we may need to make this into a two step process | |
2938 | * like scsi-mls remove + put host | |
2939 | */ | |
2940 | void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn) | |
2941 | { | |
2942 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2943 | struct iscsi_session *session = conn->session; | |
2944 | unsigned long flags; | |
2945 | ||
f6d5180c MC |
2946 | del_timer_sync(&conn->transport_timer); |
2947 | ||
659743b0 | 2948 | spin_lock_bh(&session->frwd_lock); |
7996a778 MC |
2949 | conn->c_stage = ISCSI_CONN_CLEANUP_WAIT; |
2950 | if (session->leadconn == conn) { | |
2951 | /* | |
2952 | * leading connection? then give up on recovery. | |
2953 | */ | |
2954 | session->state = ISCSI_STATE_TERMINATE; | |
2955 | wake_up(&conn->ehwait); | |
2956 | } | |
659743b0 | 2957 | spin_unlock_bh(&session->frwd_lock); |
7996a778 | 2958 | |
7996a778 MC |
2959 | /* |
2960 | * Block until all in-progress commands for this connection | |
2961 | * time out or fail. | |
2962 | */ | |
2963 | for (;;) { | |
2964 | spin_lock_irqsave(session->host->host_lock, flags); | |
74665016 | 2965 | if (!atomic_read(&session->host->host_busy)) { /* OK for ERL == 0 */ |
7996a778 MC |
2966 | spin_unlock_irqrestore(session->host->host_lock, flags); |
2967 | break; | |
2968 | } | |
2969 | spin_unlock_irqrestore(session->host->host_lock, flags); | |
2970 | msleep_interruptible(500); | |
322d739d MC |
2971 | iscsi_conn_printk(KERN_INFO, conn, "iscsi conn_destroy(): " |
2972 | "host_busy %d host_failed %d\n", | |
74665016 | 2973 | atomic_read(&session->host->host_busy), |
322d739d | 2974 | session->host->host_failed); |
7996a778 MC |
2975 | /* |
2976 | * force eh_abort() to unblock | |
2977 | */ | |
2978 | wake_up(&conn->ehwait); | |
2979 | } | |
2980 | ||
779ea120 | 2981 | /* flush queued up work because we free the connection below */ |
843c0a8a | 2982 | iscsi_suspend_tx(conn); |
779ea120 | 2983 | |
659743b0 | 2984 | spin_lock_bh(&session->frwd_lock); |
cfeb2cf9 MC |
2985 | free_pages((unsigned long) conn->data, |
2986 | get_order(ISCSI_DEF_MAX_RECV_SEG_LEN)); | |
f3ff0c36 | 2987 | kfree(conn->persistent_address); |
ae56ff40 | 2988 | kfree(conn->local_ipaddr); |
659743b0 SP |
2989 | /* regular RX path uses back_lock */ |
2990 | spin_lock_bh(&session->back_lock); | |
7acd72eb | 2991 | kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task, |
7996a778 | 2992 | sizeof(void*)); |
659743b0 | 2993 | spin_unlock_bh(&session->back_lock); |
e0726407 | 2994 | if (session->leadconn == conn) |
7996a778 | 2995 | session->leadconn = NULL; |
659743b0 | 2996 | spin_unlock_bh(&session->frwd_lock); |
7996a778 | 2997 | |
7996a778 MC |
2998 | iscsi_destroy_conn(cls_conn); |
2999 | } | |
3000 | EXPORT_SYMBOL_GPL(iscsi_conn_teardown); | |
3001 | ||
3002 | int iscsi_conn_start(struct iscsi_cls_conn *cls_conn) | |
3003 | { | |
3004 | struct iscsi_conn *conn = cls_conn->dd_data; | |
3005 | struct iscsi_session *session = conn->session; | |
3006 | ||
ffd0436e | 3007 | if (!session) { |
322d739d MC |
3008 | iscsi_conn_printk(KERN_ERR, conn, |
3009 | "can't start unbound connection\n"); | |
7996a778 MC |
3010 | return -EPERM; |
3011 | } | |
3012 | ||
db98ccde MC |
3013 | if ((session->imm_data_en || !session->initial_r2t_en) && |
3014 | session->first_burst > session->max_burst) { | |
322d739d MC |
3015 | iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: " |
3016 | "first_burst %d max_burst %d\n", | |
3017 | session->first_burst, session->max_burst); | |
ffd0436e MC |
3018 | return -EINVAL; |
3019 | } | |
3020 | ||
f6d5180c | 3021 | if (conn->ping_timeout && !conn->recv_timeout) { |
322d739d MC |
3022 | iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of " |
3023 | "zero. Using 5 seconds\n."); | |
f6d5180c MC |
3024 | conn->recv_timeout = 5; |
3025 | } | |
3026 | ||
3027 | if (conn->recv_timeout && !conn->ping_timeout) { | |
322d739d MC |
3028 | iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of " |
3029 | "zero. Using 5 seconds.\n"); | |
f6d5180c MC |
3030 | conn->ping_timeout = 5; |
3031 | } | |
3032 | ||
659743b0 | 3033 | spin_lock_bh(&session->frwd_lock); |
7996a778 MC |
3034 | conn->c_stage = ISCSI_CONN_STARTED; |
3035 | session->state = ISCSI_STATE_LOGGED_IN; | |
e0726407 | 3036 | session->queued_cmdsn = session->cmdsn; |
7996a778 | 3037 | |
f6d5180c MC |
3038 | conn->last_recv = jiffies; |
3039 | conn->last_ping = jiffies; | |
3040 | if (conn->recv_timeout && conn->ping_timeout) | |
3041 | mod_timer(&conn->transport_timer, | |
3042 | jiffies + (conn->recv_timeout * HZ)); | |
3043 | ||
7996a778 MC |
3044 | switch(conn->stop_stage) { |
3045 | case STOP_CONN_RECOVER: | |
3046 | /* | |
3047 | * unblock eh_abort() if it is blocked. re-try all | |
3048 | * commands after successful recovery | |
3049 | */ | |
7996a778 | 3050 | conn->stop_stage = 0; |
843c0a8a | 3051 | conn->tmf_state = TMF_INITIAL; |
7996a778 | 3052 | session->age++; |
8b1d0343 MC |
3053 | if (session->age == 16) |
3054 | session->age = 0; | |
6eabafbe | 3055 | break; |
7996a778 | 3056 | case STOP_CONN_TERM: |
7996a778 | 3057 | conn->stop_stage = 0; |
7996a778 MC |
3058 | break; |
3059 | default: | |
3060 | break; | |
3061 | } | |
659743b0 | 3062 | spin_unlock_bh(&session->frwd_lock); |
7996a778 | 3063 | |
75613521 | 3064 | iscsi_unblock_session(session->cls_session); |
6eabafbe | 3065 | wake_up(&conn->ehwait); |
7996a778 MC |
3066 | return 0; |
3067 | } | |
3068 | EXPORT_SYMBOL_GPL(iscsi_conn_start); | |
3069 | ||
3070 | static void | |
3bbaaad9 | 3071 | fail_mgmt_tasks(struct iscsi_session *session, struct iscsi_conn *conn) |
7996a778 | 3072 | { |
3bbaaad9 | 3073 | struct iscsi_task *task; |
b3cd5050 | 3074 | int i, state; |
7996a778 | 3075 | |
3bbaaad9 MC |
3076 | for (i = 0; i < conn->session->cmds_max; i++) { |
3077 | task = conn->session->cmds[i]; | |
3078 | if (task->sc) | |
3079 | continue; | |
7996a778 | 3080 | |
3bbaaad9 MC |
3081 | if (task->state == ISCSI_TASK_FREE) |
3082 | continue; | |
7996a778 | 3083 | |
3bbaaad9 MC |
3084 | ISCSI_DBG_SESSION(conn->session, |
3085 | "failing mgmt itt 0x%x state %d\n", | |
3086 | task->itt, task->state); | |
b3cd5050 MC |
3087 | state = ISCSI_TASK_ABRT_SESS_RECOV; |
3088 | if (task->state == ISCSI_TASK_PENDING) | |
3089 | state = ISCSI_TASK_COMPLETED; | |
3090 | iscsi_complete_task(task, state); | |
3091 | ||
3bbaaad9 | 3092 | } |
7996a778 MC |
3093 | } |
3094 | ||
656cffc9 MC |
3095 | static void iscsi_start_session_recovery(struct iscsi_session *session, |
3096 | struct iscsi_conn *conn, int flag) | |
7996a778 | 3097 | { |
ed2abc7f MC |
3098 | int old_stop_stage; |
3099 | ||
6724add1 | 3100 | mutex_lock(&session->eh_mutex); |
659743b0 | 3101 | spin_lock_bh(&session->frwd_lock); |
ed2abc7f | 3102 | if (conn->stop_stage == STOP_CONN_TERM) { |
659743b0 | 3103 | spin_unlock_bh(&session->frwd_lock); |
6724add1 MC |
3104 | mutex_unlock(&session->eh_mutex); |
3105 | return; | |
3106 | } | |
3107 | ||
ed2abc7f MC |
3108 | /* |
3109 | * When this is called for the in_login state, we only want to clean | |
9c19a7d0 | 3110 | * up the login task and connection. We do not need to block and set |
67a61114 | 3111 | * the recovery state again |
ed2abc7f | 3112 | */ |
67a61114 MC |
3113 | if (flag == STOP_CONN_TERM) |
3114 | session->state = ISCSI_STATE_TERMINATE; | |
3115 | else if (conn->stop_stage != STOP_CONN_RECOVER) | |
3116 | session->state = ISCSI_STATE_IN_RECOVERY; | |
4ae0a6c1 MC |
3117 | |
3118 | old_stop_stage = conn->stop_stage; | |
3119 | conn->stop_stage = flag; | |
659743b0 | 3120 | spin_unlock_bh(&session->frwd_lock); |
ed2abc7f | 3121 | |
26013ad4 MC |
3122 | del_timer_sync(&conn->transport_timer); |
3123 | iscsi_suspend_tx(conn); | |
3124 | ||
659743b0 | 3125 | spin_lock_bh(&session->frwd_lock); |
67a61114 | 3126 | conn->c_stage = ISCSI_CONN_STOPPED; |
659743b0 | 3127 | spin_unlock_bh(&session->frwd_lock); |
6724add1 | 3128 | |
7996a778 MC |
3129 | /* |
3130 | * for connection level recovery we should not calculate | |
3131 | * header digest. conn->hdr_size used for optimization | |
3132 | * in hdr_extract() and will be re-negotiated at | |
3133 | * set_param() time. | |
3134 | */ | |
3135 | if (flag == STOP_CONN_RECOVER) { | |
3136 | conn->hdrdgst_en = 0; | |
3137 | conn->datadgst_en = 0; | |
656cffc9 | 3138 | if (session->state == ISCSI_STATE_IN_RECOVERY && |
67a61114 | 3139 | old_stop_stage != STOP_CONN_RECOVER) { |
1b2c7af8 | 3140 | ISCSI_DBG_SESSION(session, "blocking session\n"); |
75613521 | 3141 | iscsi_block_session(session->cls_session); |
67a61114 | 3142 | } |
7996a778 | 3143 | } |
656cffc9 | 3144 | |
656cffc9 MC |
3145 | /* |
3146 | * flush queues. | |
3147 | */ | |
659743b0 | 3148 | spin_lock_bh(&session->frwd_lock); |
b3cd5050 | 3149 | fail_scsi_tasks(conn, -1, DID_TRANSPORT_DISRUPTED); |
3bbaaad9 | 3150 | fail_mgmt_tasks(session, conn); |
5d12c05e | 3151 | memset(&conn->tmhdr, 0, sizeof(conn->tmhdr)); |
659743b0 | 3152 | spin_unlock_bh(&session->frwd_lock); |
6724add1 | 3153 | mutex_unlock(&session->eh_mutex); |
7996a778 | 3154 | } |
7996a778 MC |
3155 | |
3156 | void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) | |
3157 | { | |
3158 | struct iscsi_conn *conn = cls_conn->dd_data; | |
3159 | struct iscsi_session *session = conn->session; | |
3160 | ||
3161 | switch (flag) { | |
3162 | case STOP_CONN_RECOVER: | |
3163 | case STOP_CONN_TERM: | |
3164 | iscsi_start_session_recovery(session, conn, flag); | |
8d2860b3 | 3165 | break; |
7996a778 | 3166 | default: |
322d739d MC |
3167 | iscsi_conn_printk(KERN_ERR, conn, |
3168 | "invalid stop flag %d\n", flag); | |
7996a778 MC |
3169 | } |
3170 | } | |
3171 | EXPORT_SYMBOL_GPL(iscsi_conn_stop); | |
3172 | ||
3173 | int iscsi_conn_bind(struct iscsi_cls_session *cls_session, | |
3174 | struct iscsi_cls_conn *cls_conn, int is_leading) | |
3175 | { | |
75613521 | 3176 | struct iscsi_session *session = cls_session->dd_data; |
98644047 | 3177 | struct iscsi_conn *conn = cls_conn->dd_data; |
7996a778 | 3178 | |
659743b0 | 3179 | spin_lock_bh(&session->frwd_lock); |
7996a778 MC |
3180 | if (is_leading) |
3181 | session->leadconn = conn; | |
659743b0 | 3182 | spin_unlock_bh(&session->frwd_lock); |
7996a778 MC |
3183 | |
3184 | /* | |
3185 | * Unblock xmitworker(), Login Phase will pass through. | |
3186 | */ | |
3187 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
3188 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
3189 | return 0; | |
3190 | } | |
3191 | EXPORT_SYMBOL_GPL(iscsi_conn_bind); | |
3192 | ||
adaf6990 | 3193 | int iscsi_switch_str_param(char **param, char *new_val_buf) |
5700b1af MC |
3194 | { |
3195 | char *new_val; | |
3196 | ||
3197 | if (*param) { | |
3198 | if (!strcmp(*param, new_val_buf)) | |
3199 | return 0; | |
3200 | } | |
3201 | ||
3202 | new_val = kstrdup(new_val_buf, GFP_NOIO); | |
3203 | if (!new_val) | |
3204 | return -ENOMEM; | |
3205 | ||
3206 | kfree(*param); | |
3207 | *param = new_val; | |
3208 | return 0; | |
3209 | } | |
adaf6990 | 3210 | EXPORT_SYMBOL_GPL(iscsi_switch_str_param); |
a54a52ca MC |
3211 | |
3212 | int iscsi_set_param(struct iscsi_cls_conn *cls_conn, | |
3213 | enum iscsi_param param, char *buf, int buflen) | |
3214 | { | |
3215 | struct iscsi_conn *conn = cls_conn->dd_data; | |
3216 | struct iscsi_session *session = conn->session; | |
6a06a4b8 | 3217 | int val; |
a54a52ca MC |
3218 | |
3219 | switch(param) { | |
843c0a8a MC |
3220 | case ISCSI_PARAM_FAST_ABORT: |
3221 | sscanf(buf, "%d", &session->fast_abort); | |
3222 | break; | |
f6d5180c MC |
3223 | case ISCSI_PARAM_ABORT_TMO: |
3224 | sscanf(buf, "%d", &session->abort_timeout); | |
3225 | break; | |
3226 | case ISCSI_PARAM_LU_RESET_TMO: | |
3227 | sscanf(buf, "%d", &session->lu_reset_timeout); | |
3228 | break; | |
3fe5ae8b MC |
3229 | case ISCSI_PARAM_TGT_RESET_TMO: |
3230 | sscanf(buf, "%d", &session->tgt_reset_timeout); | |
3231 | break; | |
f6d5180c MC |
3232 | case ISCSI_PARAM_PING_TMO: |
3233 | sscanf(buf, "%d", &conn->ping_timeout); | |
3234 | break; | |
3235 | case ISCSI_PARAM_RECV_TMO: | |
3236 | sscanf(buf, "%d", &conn->recv_timeout); | |
3237 | break; | |
a54a52ca MC |
3238 | case ISCSI_PARAM_MAX_RECV_DLENGTH: |
3239 | sscanf(buf, "%d", &conn->max_recv_dlength); | |
3240 | break; | |
3241 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
3242 | sscanf(buf, "%d", &conn->max_xmit_dlength); | |
3243 | break; | |
3244 | case ISCSI_PARAM_HDRDGST_EN: | |
3245 | sscanf(buf, "%d", &conn->hdrdgst_en); | |
3246 | break; | |
3247 | case ISCSI_PARAM_DATADGST_EN: | |
3248 | sscanf(buf, "%d", &conn->datadgst_en); | |
3249 | break; | |
3250 | case ISCSI_PARAM_INITIAL_R2T_EN: | |
3251 | sscanf(buf, "%d", &session->initial_r2t_en); | |
3252 | break; | |
3253 | case ISCSI_PARAM_MAX_R2T: | |
1304be5f | 3254 | sscanf(buf, "%hu", &session->max_r2t); |
a54a52ca MC |
3255 | break; |
3256 | case ISCSI_PARAM_IMM_DATA_EN: | |
3257 | sscanf(buf, "%d", &session->imm_data_en); | |
3258 | break; | |
3259 | case ISCSI_PARAM_FIRST_BURST: | |
3260 | sscanf(buf, "%d", &session->first_burst); | |
3261 | break; | |
3262 | case ISCSI_PARAM_MAX_BURST: | |
3263 | sscanf(buf, "%d", &session->max_burst); | |
3264 | break; | |
3265 | case ISCSI_PARAM_PDU_INORDER_EN: | |
3266 | sscanf(buf, "%d", &session->pdu_inorder_en); | |
3267 | break; | |
3268 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
3269 | sscanf(buf, "%d", &session->dataseq_inorder_en); | |
3270 | break; | |
3271 | case ISCSI_PARAM_ERL: | |
3272 | sscanf(buf, "%d", &session->erl); | |
3273 | break; | |
a54a52ca MC |
3274 | case ISCSI_PARAM_EXP_STATSN: |
3275 | sscanf(buf, "%u", &conn->exp_statsn); | |
3276 | break; | |
b2c64167 | 3277 | case ISCSI_PARAM_USERNAME: |
5700b1af | 3278 | return iscsi_switch_str_param(&session->username, buf); |
b2c64167 | 3279 | case ISCSI_PARAM_USERNAME_IN: |
5700b1af | 3280 | return iscsi_switch_str_param(&session->username_in, buf); |
b2c64167 | 3281 | case ISCSI_PARAM_PASSWORD: |
5700b1af | 3282 | return iscsi_switch_str_param(&session->password, buf); |
b2c64167 | 3283 | case ISCSI_PARAM_PASSWORD_IN: |
5700b1af | 3284 | return iscsi_switch_str_param(&session->password_in, buf); |
a54a52ca | 3285 | case ISCSI_PARAM_TARGET_NAME: |
5700b1af | 3286 | return iscsi_switch_str_param(&session->targetname, buf); |
3c5c4801 VC |
3287 | case ISCSI_PARAM_TARGET_ALIAS: |
3288 | return iscsi_switch_str_param(&session->targetalias, buf); | |
a54a52ca MC |
3289 | case ISCSI_PARAM_TPGT: |
3290 | sscanf(buf, "%d", &session->tpgt); | |
3291 | break; | |
3292 | case ISCSI_PARAM_PERSISTENT_PORT: | |
3293 | sscanf(buf, "%d", &conn->persistent_port); | |
3294 | break; | |
3295 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
5700b1af | 3296 | return iscsi_switch_str_param(&conn->persistent_address, buf); |
88dfd340 | 3297 | case ISCSI_PARAM_IFACE_NAME: |
5700b1af | 3298 | return iscsi_switch_str_param(&session->ifacename, buf); |
88dfd340 | 3299 | case ISCSI_PARAM_INITIATOR_NAME: |
5700b1af | 3300 | return iscsi_switch_str_param(&session->initiatorname, buf); |
3b9373e9 EW |
3301 | case ISCSI_PARAM_BOOT_ROOT: |
3302 | return iscsi_switch_str_param(&session->boot_root, buf); | |
3303 | case ISCSI_PARAM_BOOT_NIC: | |
3304 | return iscsi_switch_str_param(&session->boot_nic, buf); | |
3305 | case ISCSI_PARAM_BOOT_TARGET: | |
3306 | return iscsi_switch_str_param(&session->boot_target, buf); | |
f8525eb4 AC |
3307 | case ISCSI_PARAM_PORTAL_TYPE: |
3308 | return iscsi_switch_str_param(&session->portal_type, buf); | |
3309 | case ISCSI_PARAM_DISCOVERY_PARENT_TYPE: | |
3310 | return iscsi_switch_str_param(&session->discovery_parent_type, | |
3311 | buf); | |
6a06a4b8 OG |
3312 | case ISCSI_PARAM_DISCOVERY_SESS: |
3313 | sscanf(buf, "%d", &val); | |
3314 | session->discovery_sess = !!val; | |
3315 | break; | |
ae56ff40 AC |
3316 | case ISCSI_PARAM_LOCAL_IPADDR: |
3317 | return iscsi_switch_str_param(&conn->local_ipaddr, buf); | |
a54a52ca MC |
3318 | default: |
3319 | return -ENOSYS; | |
3320 | } | |
3321 | ||
3322 | return 0; | |
3323 | } | |
3324 | EXPORT_SYMBOL_GPL(iscsi_set_param); | |
3325 | ||
3326 | int iscsi_session_get_param(struct iscsi_cls_session *cls_session, | |
3327 | enum iscsi_param param, char *buf) | |
3328 | { | |
75613521 | 3329 | struct iscsi_session *session = cls_session->dd_data; |
a54a52ca MC |
3330 | int len; |
3331 | ||
3332 | switch(param) { | |
843c0a8a MC |
3333 | case ISCSI_PARAM_FAST_ABORT: |
3334 | len = sprintf(buf, "%d\n", session->fast_abort); | |
3335 | break; | |
f6d5180c MC |
3336 | case ISCSI_PARAM_ABORT_TMO: |
3337 | len = sprintf(buf, "%d\n", session->abort_timeout); | |
3338 | break; | |
3339 | case ISCSI_PARAM_LU_RESET_TMO: | |
3340 | len = sprintf(buf, "%d\n", session->lu_reset_timeout); | |
3341 | break; | |
3fe5ae8b MC |
3342 | case ISCSI_PARAM_TGT_RESET_TMO: |
3343 | len = sprintf(buf, "%d\n", session->tgt_reset_timeout); | |
3344 | break; | |
a54a52ca MC |
3345 | case ISCSI_PARAM_INITIAL_R2T_EN: |
3346 | len = sprintf(buf, "%d\n", session->initial_r2t_en); | |
3347 | break; | |
3348 | case ISCSI_PARAM_MAX_R2T: | |
3349 | len = sprintf(buf, "%hu\n", session->max_r2t); | |
3350 | break; | |
3351 | case ISCSI_PARAM_IMM_DATA_EN: | |
3352 | len = sprintf(buf, "%d\n", session->imm_data_en); | |
3353 | break; | |
3354 | case ISCSI_PARAM_FIRST_BURST: | |
3355 | len = sprintf(buf, "%u\n", session->first_burst); | |
3356 | break; | |
3357 | case ISCSI_PARAM_MAX_BURST: | |
3358 | len = sprintf(buf, "%u\n", session->max_burst); | |
3359 | break; | |
3360 | case ISCSI_PARAM_PDU_INORDER_EN: | |
3361 | len = sprintf(buf, "%d\n", session->pdu_inorder_en); | |
3362 | break; | |
3363 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
3364 | len = sprintf(buf, "%d\n", session->dataseq_inorder_en); | |
3365 | break; | |
5f09e1f3 AC |
3366 | case ISCSI_PARAM_DEF_TASKMGMT_TMO: |
3367 | len = sprintf(buf, "%d\n", session->def_taskmgmt_tmo); | |
3368 | break; | |
a54a52ca MC |
3369 | case ISCSI_PARAM_ERL: |
3370 | len = sprintf(buf, "%d\n", session->erl); | |
3371 | break; | |
3372 | case ISCSI_PARAM_TARGET_NAME: | |
3373 | len = sprintf(buf, "%s\n", session->targetname); | |
3374 | break; | |
3c5c4801 VC |
3375 | case ISCSI_PARAM_TARGET_ALIAS: |
3376 | len = sprintf(buf, "%s\n", session->targetalias); | |
3377 | break; | |
a54a52ca MC |
3378 | case ISCSI_PARAM_TPGT: |
3379 | len = sprintf(buf, "%d\n", session->tpgt); | |
3380 | break; | |
b2c64167 MC |
3381 | case ISCSI_PARAM_USERNAME: |
3382 | len = sprintf(buf, "%s\n", session->username); | |
3383 | break; | |
3384 | case ISCSI_PARAM_USERNAME_IN: | |
3385 | len = sprintf(buf, "%s\n", session->username_in); | |
3386 | break; | |
3387 | case ISCSI_PARAM_PASSWORD: | |
3388 | len = sprintf(buf, "%s\n", session->password); | |
3389 | break; | |
3390 | case ISCSI_PARAM_PASSWORD_IN: | |
3391 | len = sprintf(buf, "%s\n", session->password_in); | |
3392 | break; | |
88dfd340 MC |
3393 | case ISCSI_PARAM_IFACE_NAME: |
3394 | len = sprintf(buf, "%s\n", session->ifacename); | |
3395 | break; | |
3396 | case ISCSI_PARAM_INITIATOR_NAME: | |
5700b1af | 3397 | len = sprintf(buf, "%s\n", session->initiatorname); |
88dfd340 | 3398 | break; |
3b9373e9 EW |
3399 | case ISCSI_PARAM_BOOT_ROOT: |
3400 | len = sprintf(buf, "%s\n", session->boot_root); | |
3401 | break; | |
3402 | case ISCSI_PARAM_BOOT_NIC: | |
3403 | len = sprintf(buf, "%s\n", session->boot_nic); | |
3404 | break; | |
3405 | case ISCSI_PARAM_BOOT_TARGET: | |
3406 | len = sprintf(buf, "%s\n", session->boot_target); | |
9a2307b1 | 3407 | break; |
f8525eb4 AC |
3408 | case ISCSI_PARAM_AUTO_SND_TGT_DISABLE: |
3409 | len = sprintf(buf, "%u\n", session->auto_snd_tgt_disable); | |
3410 | break; | |
3411 | case ISCSI_PARAM_DISCOVERY_SESS: | |
3412 | len = sprintf(buf, "%u\n", session->discovery_sess); | |
3413 | break; | |
3414 | case ISCSI_PARAM_PORTAL_TYPE: | |
3415 | len = sprintf(buf, "%s\n", session->portal_type); | |
3416 | break; | |
3417 | case ISCSI_PARAM_CHAP_AUTH_EN: | |
3418 | len = sprintf(buf, "%u\n", session->chap_auth_en); | |
3419 | break; | |
3420 | case ISCSI_PARAM_DISCOVERY_LOGOUT_EN: | |
3421 | len = sprintf(buf, "%u\n", session->discovery_logout_en); | |
3422 | break; | |
3423 | case ISCSI_PARAM_BIDI_CHAP_EN: | |
3424 | len = sprintf(buf, "%u\n", session->bidi_chap_en); | |
3425 | break; | |
3426 | case ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL: | |
3427 | len = sprintf(buf, "%u\n", session->discovery_auth_optional); | |
3428 | break; | |
3429 | case ISCSI_PARAM_DEF_TIME2WAIT: | |
3430 | len = sprintf(buf, "%d\n", session->time2wait); | |
3431 | break; | |
3432 | case ISCSI_PARAM_DEF_TIME2RETAIN: | |
3433 | len = sprintf(buf, "%d\n", session->time2retain); | |
3434 | break; | |
3435 | case ISCSI_PARAM_TSID: | |
3436 | len = sprintf(buf, "%u\n", session->tsid); | |
3437 | break; | |
3438 | case ISCSI_PARAM_ISID: | |
3439 | len = sprintf(buf, "%02x%02x%02x%02x%02x%02x\n", | |
3440 | session->isid[0], session->isid[1], | |
3441 | session->isid[2], session->isid[3], | |
3442 | session->isid[4], session->isid[5]); | |
3443 | break; | |
3444 | case ISCSI_PARAM_DISCOVERY_PARENT_IDX: | |
3445 | len = sprintf(buf, "%u\n", session->discovery_parent_idx); | |
3446 | break; | |
3447 | case ISCSI_PARAM_DISCOVERY_PARENT_TYPE: | |
3448 | if (session->discovery_parent_type) | |
3449 | len = sprintf(buf, "%s\n", | |
3450 | session->discovery_parent_type); | |
3451 | else | |
3452 | len = sprintf(buf, "\n"); | |
3b9373e9 | 3453 | break; |
a54a52ca MC |
3454 | default: |
3455 | return -ENOSYS; | |
3456 | } | |
3457 | ||
3458 | return len; | |
3459 | } | |
3460 | EXPORT_SYMBOL_GPL(iscsi_session_get_param); | |
3461 | ||
00f3708e MC |
3462 | int iscsi_conn_get_addr_param(struct sockaddr_storage *addr, |
3463 | enum iscsi_param param, char *buf) | |
3464 | { | |
3465 | struct sockaddr_in6 *sin6 = NULL; | |
3466 | struct sockaddr_in *sin = NULL; | |
3467 | int len; | |
3468 | ||
3469 | switch (addr->ss_family) { | |
3470 | case AF_INET: | |
3471 | sin = (struct sockaddr_in *)addr; | |
3472 | break; | |
3473 | case AF_INET6: | |
3474 | sin6 = (struct sockaddr_in6 *)addr; | |
3475 | break; | |
3476 | default: | |
3477 | return -EINVAL; | |
3478 | } | |
3479 | ||
3480 | switch (param) { | |
3481 | case ISCSI_PARAM_CONN_ADDRESS: | |
3482 | case ISCSI_HOST_PARAM_IPADDRESS: | |
3483 | if (sin) | |
3484 | len = sprintf(buf, "%pI4\n", &sin->sin_addr.s_addr); | |
3485 | else | |
3486 | len = sprintf(buf, "%pI6\n", &sin6->sin6_addr); | |
3487 | break; | |
3488 | case ISCSI_PARAM_CONN_PORT: | |
4bfb8ebf | 3489 | case ISCSI_PARAM_LOCAL_PORT: |
00f3708e MC |
3490 | if (sin) |
3491 | len = sprintf(buf, "%hu\n", be16_to_cpu(sin->sin_port)); | |
3492 | else | |
3493 | len = sprintf(buf, "%hu\n", | |
3494 | be16_to_cpu(sin6->sin6_port)); | |
3495 | break; | |
3496 | default: | |
3497 | return -EINVAL; | |
3498 | } | |
3499 | ||
3500 | return len; | |
3501 | } | |
3502 | EXPORT_SYMBOL_GPL(iscsi_conn_get_addr_param); | |
3503 | ||
a54a52ca MC |
3504 | int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn, |
3505 | enum iscsi_param param, char *buf) | |
3506 | { | |
3507 | struct iscsi_conn *conn = cls_conn->dd_data; | |
3508 | int len; | |
3509 | ||
3510 | switch(param) { | |
f6d5180c MC |
3511 | case ISCSI_PARAM_PING_TMO: |
3512 | len = sprintf(buf, "%u\n", conn->ping_timeout); | |
3513 | break; | |
3514 | case ISCSI_PARAM_RECV_TMO: | |
3515 | len = sprintf(buf, "%u\n", conn->recv_timeout); | |
3516 | break; | |
a54a52ca MC |
3517 | case ISCSI_PARAM_MAX_RECV_DLENGTH: |
3518 | len = sprintf(buf, "%u\n", conn->max_recv_dlength); | |
3519 | break; | |
3520 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
3521 | len = sprintf(buf, "%u\n", conn->max_xmit_dlength); | |
3522 | break; | |
3523 | case ISCSI_PARAM_HDRDGST_EN: | |
3524 | len = sprintf(buf, "%d\n", conn->hdrdgst_en); | |
3525 | break; | |
3526 | case ISCSI_PARAM_DATADGST_EN: | |
3527 | len = sprintf(buf, "%d\n", conn->datadgst_en); | |
3528 | break; | |
3529 | case ISCSI_PARAM_IFMARKER_EN: | |
3530 | len = sprintf(buf, "%d\n", conn->ifmarker_en); | |
3531 | break; | |
3532 | case ISCSI_PARAM_OFMARKER_EN: | |
3533 | len = sprintf(buf, "%d\n", conn->ofmarker_en); | |
3534 | break; | |
3535 | case ISCSI_PARAM_EXP_STATSN: | |
3536 | len = sprintf(buf, "%u\n", conn->exp_statsn); | |
3537 | break; | |
3538 | case ISCSI_PARAM_PERSISTENT_PORT: | |
3539 | len = sprintf(buf, "%d\n", conn->persistent_port); | |
3540 | break; | |
3541 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
3542 | len = sprintf(buf, "%s\n", conn->persistent_address); | |
3543 | break; | |
f8525eb4 AC |
3544 | case ISCSI_PARAM_STATSN: |
3545 | len = sprintf(buf, "%u\n", conn->statsn); | |
3546 | break; | |
3547 | case ISCSI_PARAM_MAX_SEGMENT_SIZE: | |
3548 | len = sprintf(buf, "%u\n", conn->max_segment_size); | |
3549 | break; | |
3550 | case ISCSI_PARAM_KEEPALIVE_TMO: | |
3551 | len = sprintf(buf, "%u\n", conn->keepalive_tmo); | |
3552 | break; | |
3553 | case ISCSI_PARAM_LOCAL_PORT: | |
3554 | len = sprintf(buf, "%u\n", conn->local_port); | |
3555 | break; | |
3556 | case ISCSI_PARAM_TCP_TIMESTAMP_STAT: | |
3557 | len = sprintf(buf, "%u\n", conn->tcp_timestamp_stat); | |
3558 | break; | |
3559 | case ISCSI_PARAM_TCP_NAGLE_DISABLE: | |
3560 | len = sprintf(buf, "%u\n", conn->tcp_nagle_disable); | |
3561 | break; | |
3562 | case ISCSI_PARAM_TCP_WSF_DISABLE: | |
3563 | len = sprintf(buf, "%u\n", conn->tcp_wsf_disable); | |
3564 | break; | |
3565 | case ISCSI_PARAM_TCP_TIMER_SCALE: | |
3566 | len = sprintf(buf, "%u\n", conn->tcp_timer_scale); | |
3567 | break; | |
3568 | case ISCSI_PARAM_TCP_TIMESTAMP_EN: | |
3569 | len = sprintf(buf, "%u\n", conn->tcp_timestamp_en); | |
3570 | break; | |
3571 | case ISCSI_PARAM_IP_FRAGMENT_DISABLE: | |
3572 | len = sprintf(buf, "%u\n", conn->fragment_disable); | |
3573 | break; | |
3574 | case ISCSI_PARAM_IPV4_TOS: | |
3575 | len = sprintf(buf, "%u\n", conn->ipv4_tos); | |
3576 | break; | |
3577 | case ISCSI_PARAM_IPV6_TC: | |
3578 | len = sprintf(buf, "%u\n", conn->ipv6_traffic_class); | |
3579 | break; | |
5f09e1f3 AC |
3580 | case ISCSI_PARAM_IPV6_FLOW_LABEL: |
3581 | len = sprintf(buf, "%u\n", conn->ipv6_flow_label); | |
3582 | break; | |
f8525eb4 AC |
3583 | case ISCSI_PARAM_IS_FW_ASSIGNED_IPV6: |
3584 | len = sprintf(buf, "%u\n", conn->is_fw_assigned_ipv6); | |
3585 | break; | |
3586 | case ISCSI_PARAM_TCP_XMIT_WSF: | |
3587 | len = sprintf(buf, "%u\n", conn->tcp_xmit_wsf); | |
3588 | break; | |
3589 | case ISCSI_PARAM_TCP_RECV_WSF: | |
3590 | len = sprintf(buf, "%u\n", conn->tcp_recv_wsf); | |
3591 | break; | |
ae56ff40 AC |
3592 | case ISCSI_PARAM_LOCAL_IPADDR: |
3593 | len = sprintf(buf, "%s\n", conn->local_ipaddr); | |
3594 | break; | |
a54a52ca MC |
3595 | default: |
3596 | return -ENOSYS; | |
3597 | } | |
3598 | ||
3599 | return len; | |
3600 | } | |
3601 | EXPORT_SYMBOL_GPL(iscsi_conn_get_param); | |
3602 | ||
0801c242 MC |
3603 | int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param, |
3604 | char *buf) | |
3605 | { | |
75613521 | 3606 | struct iscsi_host *ihost = shost_priv(shost); |
0801c242 MC |
3607 | int len; |
3608 | ||
3609 | switch (param) { | |
d8196ed2 | 3610 | case ISCSI_HOST_PARAM_NETDEV_NAME: |
5700b1af | 3611 | len = sprintf(buf, "%s\n", ihost->netdev); |
d8196ed2 | 3612 | break; |
0801c242 | 3613 | case ISCSI_HOST_PARAM_HWADDRESS: |
5700b1af | 3614 | len = sprintf(buf, "%s\n", ihost->hwaddress); |
0801c242 | 3615 | break; |
8ad5781a | 3616 | case ISCSI_HOST_PARAM_INITIATOR_NAME: |
5700b1af | 3617 | len = sprintf(buf, "%s\n", ihost->initiatorname); |
8ad5781a | 3618 | break; |
0801c242 MC |
3619 | default: |
3620 | return -ENOSYS; | |
3621 | } | |
3622 | ||
3623 | return len; | |
3624 | } | |
3625 | EXPORT_SYMBOL_GPL(iscsi_host_get_param); | |
3626 | ||
3627 | int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param, | |
3628 | char *buf, int buflen) | |
3629 | { | |
75613521 | 3630 | struct iscsi_host *ihost = shost_priv(shost); |
0801c242 MC |
3631 | |
3632 | switch (param) { | |
d8196ed2 | 3633 | case ISCSI_HOST_PARAM_NETDEV_NAME: |
5700b1af | 3634 | return iscsi_switch_str_param(&ihost->netdev, buf); |
0801c242 | 3635 | case ISCSI_HOST_PARAM_HWADDRESS: |
5700b1af | 3636 | return iscsi_switch_str_param(&ihost->hwaddress, buf); |
8ad5781a | 3637 | case ISCSI_HOST_PARAM_INITIATOR_NAME: |
5700b1af | 3638 | return iscsi_switch_str_param(&ihost->initiatorname, buf); |
0801c242 MC |
3639 | default: |
3640 | return -ENOSYS; | |
3641 | } | |
3642 | ||
3643 | return 0; | |
3644 | } | |
3645 | EXPORT_SYMBOL_GPL(iscsi_host_set_param); | |
3646 | ||
7996a778 MC |
3647 | MODULE_AUTHOR("Mike Christie"); |
3648 | MODULE_DESCRIPTION("iSCSI library functions"); | |
3649 | MODULE_LICENSE("GPL"); |