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; | |
263 | unsigned int hdr_lun; | |
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; |
38d1c069 | 341 | unsigned hdrlength, cmd_len; |
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 | ||
7996a778 | 394 | if (sc->sc_data_direction == DMA_TO_DEVICE) { |
c07d4444 | 395 | unsigned out_len = scsi_out(sc)->length; |
577577da MC |
396 | struct iscsi_r2t_info *r2t = &task->unsol_r2t; |
397 | ||
c07d4444 | 398 | hdr->data_length = cpu_to_be32(out_len); |
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) { | |
c07d4444 | 417 | if (out_len >= session->first_burst) |
9c19a7d0 | 418 | task->imm_count = min(session->first_burst, |
7996a778 MC |
419 | conn->max_xmit_dlength); |
420 | else | |
9c19a7d0 | 421 | task->imm_count = min(out_len, |
7996a778 | 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) { |
577577da MC |
428 | r2t->data_length = min(session->first_burst, out_len) - |
429 | task->imm_count; | |
430 | r2t->data_offset = task->imm_count; | |
431 | r2t->ttt = cpu_to_be32(ISCSI_RESERVED_TAG); | |
432 | r2t->exp_statsn = cpu_to_be32(conn->exp_statsn); | |
ffd0436e MC |
433 | } |
434 | ||
577577da | 435 | if (!task->unsol_r2t.data_length) |
7996a778 | 436 | /* No unsolicit Data-Out's */ |
a8ac6311 | 437 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; |
7996a778 | 438 | } else { |
7996a778 MC |
439 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; |
440 | zero_data(hdr->dlength); | |
c07d4444 | 441 | hdr->data_length = cpu_to_be32(scsi_in(sc)->length); |
7996a778 MC |
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], | |
469 | task->itt, scsi_bufflen(sc), | |
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 | ||
9c19a7d0 | 720 | task = conn->login_task; |
4f704dc0 | 721 | } else { |
26013ad4 MC |
722 | if (session->state != ISCSI_STATE_LOGGED_IN) |
723 | return NULL; | |
724 | ||
f6d5180c MC |
725 | BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE); |
726 | BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED); | |
727 | ||
7acd72eb | 728 | if (!kfifo_out(&session->cmdpool.queue, |
9c19a7d0 | 729 | (void*)&task, sizeof(void*))) |
f6d5180c MC |
730 | return NULL; |
731 | } | |
3e5c28ad MC |
732 | /* |
733 | * released in complete pdu for task we expect a response for, and | |
734 | * released by the lld when it has transmitted the task for | |
735 | * pdus we do not expect a response for. | |
736 | */ | |
9c19a7d0 MC |
737 | atomic_set(&task->refcount, 1); |
738 | task->conn = conn; | |
739 | task->sc = NULL; | |
3bbaaad9 MC |
740 | INIT_LIST_HEAD(&task->running); |
741 | task->state = ISCSI_TASK_PENDING; | |
f6d5180c MC |
742 | |
743 | if (data_size) { | |
9c19a7d0 MC |
744 | memcpy(task->data, data, data_size); |
745 | task->data_count = data_size; | |
f6d5180c | 746 | } else |
9c19a7d0 | 747 | task->data_count = 0; |
f6d5180c | 748 | |
184b57c6 MC |
749 | if (conn->session->tt->alloc_pdu) { |
750 | if (conn->session->tt->alloc_pdu(task, hdr->opcode)) { | |
751 | iscsi_conn_printk(KERN_ERR, conn, "Could not allocate " | |
752 | "pdu for mgmt task.\n"); | |
3bbaaad9 | 753 | goto free_task; |
184b57c6 | 754 | } |
577577da | 755 | } |
184b57c6 | 756 | |
262ef636 | 757 | itt = task->hdr->itt; |
577577da | 758 | task->hdr_len = sizeof(struct iscsi_hdr); |
9c19a7d0 | 759 | memcpy(task->hdr, hdr, sizeof(struct iscsi_hdr)); |
262ef636 MC |
760 | |
761 | if (hdr->itt != RESERVED_ITT) { | |
762 | if (session->tt->parse_pdu_itt) | |
763 | task->hdr->itt = itt; | |
764 | else | |
765 | task->hdr->itt = build_itt(task->itt, | |
766 | task->conn->session->age); | |
767 | } | |
768 | ||
1336aed1 | 769 | if (!ihost->workq) { |
577577da MC |
770 | if (iscsi_prep_mgmt_task(conn, task)) |
771 | goto free_task; | |
052d0144 | 772 | |
9c19a7d0 | 773 | if (session->tt->xmit_task(task)) |
577577da | 774 | goto free_task; |
3bbaaad9 MC |
775 | } else { |
776 | list_add_tail(&task->running, &conn->mgmtqueue); | |
32ae763e | 777 | iscsi_conn_queue_work(conn); |
3bbaaad9 | 778 | } |
052d0144 | 779 | |
9c19a7d0 | 780 | return task; |
577577da MC |
781 | |
782 | free_task: | |
659743b0 SP |
783 | /* regular RX path uses back_lock */ |
784 | spin_lock_bh(&session->back_lock); | |
577577da | 785 | __iscsi_put_task(task); |
659743b0 | 786 | spin_unlock_bh(&session->back_lock); |
577577da | 787 | return NULL; |
f6d5180c MC |
788 | } |
789 | ||
790 | int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr, | |
791 | char *data, uint32_t data_size) | |
792 | { | |
793 | struct iscsi_conn *conn = cls_conn->dd_data; | |
794 | struct iscsi_session *session = conn->session; | |
795 | int err = 0; | |
796 | ||
659743b0 | 797 | spin_lock_bh(&session->frwd_lock); |
f6d5180c MC |
798 | if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size)) |
799 | err = -EPERM; | |
659743b0 | 800 | spin_unlock_bh(&session->frwd_lock); |
f6d5180c MC |
801 | return err; |
802 | } | |
803 | EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu); | |
804 | ||
7996a778 MC |
805 | /** |
806 | * iscsi_cmd_rsp - SCSI Command Response processing | |
807 | * @conn: iscsi connection | |
808 | * @hdr: iscsi header | |
9c19a7d0 | 809 | * @task: scsi command task |
7996a778 MC |
810 | * @data: cmd data buffer |
811 | * @datalen: len of buffer | |
812 | * | |
813 | * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and | |
9c19a7d0 | 814 | * then completes the command and task. |
7996a778 | 815 | **/ |
77a23c21 | 816 | static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
9c19a7d0 | 817 | struct iscsi_task *task, char *data, |
77a23c21 | 818 | int datalen) |
7996a778 | 819 | { |
12352183 | 820 | struct iscsi_scsi_rsp *rhdr = (struct iscsi_scsi_rsp *)hdr; |
7996a778 | 821 | struct iscsi_session *session = conn->session; |
9c19a7d0 | 822 | struct scsi_cmnd *sc = task->sc; |
7996a778 | 823 | |
77a23c21 | 824 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr); |
7996a778 MC |
825 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; |
826 | ||
827 | sc->result = (DID_OK << 16) | rhdr->cmd_status; | |
828 | ||
55e51eda SG |
829 | if (task->protected) { |
830 | sector_t sector; | |
831 | u8 ascq; | |
832 | ||
833 | /** | |
834 | * Transports that didn't implement check_protection | |
835 | * callback but still published T10-PI support to scsi-mid | |
836 | * deserve this BUG_ON. | |
837 | **/ | |
838 | BUG_ON(!session->tt->check_protection); | |
839 | ||
840 | ascq = session->tt->check_protection(task, §or); | |
841 | if (ascq) { | |
842 | sc->result = DRIVER_SENSE << 24 | | |
843 | SAM_STAT_CHECK_CONDITION; | |
844 | scsi_build_sense_buffer(1, sc->sense_buffer, | |
845 | ILLEGAL_REQUEST, 0x10, ascq); | |
846 | sc->sense_buffer[7] = 0xc; /* Additional sense length */ | |
847 | sc->sense_buffer[8] = 0; /* Information desc type */ | |
848 | sc->sense_buffer[9] = 0xa; /* Additional desc length */ | |
849 | sc->sense_buffer[10] = 0x80; /* Validity bit */ | |
850 | ||
851 | put_unaligned_be64(sector, &sc->sense_buffer[12]); | |
852 | goto out; | |
853 | } | |
854 | } | |
855 | ||
7996a778 MC |
856 | if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) { |
857 | sc->result = DID_ERROR << 16; | |
858 | goto out; | |
859 | } | |
860 | ||
861 | if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) { | |
9b80cb4b | 862 | uint16_t senselen; |
7996a778 MC |
863 | |
864 | if (datalen < 2) { | |
865 | invalid_datalen: | |
322d739d MC |
866 | iscsi_conn_printk(KERN_ERR, conn, |
867 | "Got CHECK_CONDITION but invalid data " | |
868 | "buffer size of %d\n", datalen); | |
7996a778 MC |
869 | sc->result = DID_BAD_TARGET << 16; |
870 | goto out; | |
871 | } | |
872 | ||
8f333991 | 873 | senselen = get_unaligned_be16(data); |
7996a778 MC |
874 | if (datalen < senselen) |
875 | goto invalid_datalen; | |
876 | ||
877 | memcpy(sc->sense_buffer, data + 2, | |
9b80cb4b | 878 | min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE)); |
1b2c7af8 MC |
879 | ISCSI_DBG_SESSION(session, "copied %d bytes of sense\n", |
880 | min_t(uint16_t, senselen, | |
881 | SCSI_SENSE_BUFFERSIZE)); | |
7996a778 MC |
882 | } |
883 | ||
c07d4444 BH |
884 | if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW | |
885 | ISCSI_FLAG_CMD_BIDI_OVERFLOW)) { | |
886 | int res_count = be32_to_cpu(rhdr->bi_residual_count); | |
887 | ||
888 | if (scsi_bidi_cmnd(sc) && res_count > 0 && | |
889 | (rhdr->flags & ISCSI_FLAG_CMD_BIDI_OVERFLOW || | |
890 | res_count <= scsi_in(sc)->length)) | |
891 | scsi_in(sc)->resid = res_count; | |
892 | else | |
893 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
894 | } | |
895 | ||
7207fea4 BH |
896 | if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW | |
897 | ISCSI_FLAG_CMD_OVERFLOW)) { | |
7996a778 MC |
898 | int res_count = be32_to_cpu(rhdr->residual_count); |
899 | ||
7207fea4 BH |
900 | if (res_count > 0 && |
901 | (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || | |
902 | res_count <= scsi_bufflen(sc))) | |
c07d4444 | 903 | /* write side for bidi or uni-io set_resid */ |
1c138991 | 904 | scsi_set_resid(sc, res_count); |
7996a778 MC |
905 | else |
906 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
c07d4444 | 907 | } |
7996a778 | 908 | out: |
3bbaaad9 | 909 | ISCSI_DBG_SESSION(session, "cmd rsp done [sc %p res %d itt 0x%x]\n", |
1b2c7af8 | 910 | sc, sc->result, task->itt); |
7996a778 | 911 | conn->scsirsp_pdus_cnt++; |
b3cd5050 | 912 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); |
7996a778 MC |
913 | } |
914 | ||
1d9edf02 MC |
915 | /** |
916 | * iscsi_data_in_rsp - SCSI Data-In Response processing | |
917 | * @conn: iscsi connection | |
918 | * @hdr: iscsi pdu | |
919 | * @task: scsi command task | |
920 | **/ | |
921 | static void | |
922 | iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
923 | struct iscsi_task *task) | |
924 | { | |
925 | struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)hdr; | |
926 | struct scsi_cmnd *sc = task->sc; | |
927 | ||
928 | if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS)) | |
929 | return; | |
930 | ||
edbc9aa0 | 931 | iscsi_update_cmdsn(conn->session, (struct iscsi_nopin *)hdr); |
1d9edf02 MC |
932 | sc->result = (DID_OK << 16) | rhdr->cmd_status; |
933 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; | |
934 | if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW | | |
935 | ISCSI_FLAG_DATA_OVERFLOW)) { | |
936 | int res_count = be32_to_cpu(rhdr->residual_count); | |
937 | ||
938 | if (res_count > 0 && | |
939 | (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || | |
940 | res_count <= scsi_in(sc)->length)) | |
941 | scsi_in(sc)->resid = res_count; | |
942 | else | |
943 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
944 | } | |
945 | ||
3bbaaad9 MC |
946 | ISCSI_DBG_SESSION(conn->session, "data in with status done " |
947 | "[sc %p res %d itt 0x%x]\n", | |
948 | sc, sc->result, task->itt); | |
1d9edf02 | 949 | conn->scsirsp_pdus_cnt++; |
b3cd5050 | 950 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); |
1d9edf02 MC |
951 | } |
952 | ||
7ea8b828 MC |
953 | static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr) |
954 | { | |
955 | struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr; | |
956 | ||
957 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
958 | conn->tmfrsp_pdus_cnt++; | |
959 | ||
843c0a8a | 960 | if (conn->tmf_state != TMF_QUEUED) |
7ea8b828 MC |
961 | return; |
962 | ||
963 | if (tmf->response == ISCSI_TMF_RSP_COMPLETE) | |
843c0a8a | 964 | conn->tmf_state = TMF_SUCCESS; |
7ea8b828 | 965 | else if (tmf->response == ISCSI_TMF_RSP_NO_TASK) |
843c0a8a | 966 | conn->tmf_state = TMF_NOT_FOUND; |
7ea8b828 | 967 | else |
843c0a8a | 968 | conn->tmf_state = TMF_FAILED; |
7ea8b828 MC |
969 | wake_up(&conn->ehwait); |
970 | } | |
971 | ||
f6d5180c MC |
972 | static void iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr) |
973 | { | |
974 | struct iscsi_nopout hdr; | |
9c19a7d0 | 975 | struct iscsi_task *task; |
f6d5180c | 976 | |
9c19a7d0 | 977 | if (!rhdr && conn->ping_task) |
f6d5180c MC |
978 | return; |
979 | ||
980 | memset(&hdr, 0, sizeof(struct iscsi_nopout)); | |
981 | hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE; | |
982 | hdr.flags = ISCSI_FLAG_CMD_FINAL; | |
983 | ||
984 | if (rhdr) { | |
55bdabdf | 985 | hdr.lun = rhdr->lun; |
f6d5180c MC |
986 | hdr.ttt = rhdr->ttt; |
987 | hdr.itt = RESERVED_ITT; | |
988 | } else | |
989 | hdr.ttt = RESERVED_ITT; | |
990 | ||
9c19a7d0 MC |
991 | task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0); |
992 | if (!task) | |
322d739d | 993 | iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n"); |
d3acf022 MC |
994 | else if (!rhdr) { |
995 | /* only track our nops */ | |
996 | conn->ping_task = task; | |
997 | conn->last_ping = jiffies; | |
998 | } | |
f6d5180c MC |
999 | } |
1000 | ||
8afa1439 MC |
1001 | static int iscsi_nop_out_rsp(struct iscsi_task *task, |
1002 | struct iscsi_nopin *nop, char *data, int datalen) | |
1003 | { | |
1004 | struct iscsi_conn *conn = task->conn; | |
1005 | int rc = 0; | |
1006 | ||
1007 | if (conn->ping_task != task) { | |
1008 | /* | |
1009 | * If this is not in response to one of our | |
1010 | * nops then it must be from userspace. | |
1011 | */ | |
1012 | if (iscsi_recv_pdu(conn->cls_conn, (struct iscsi_hdr *)nop, | |
1013 | data, datalen)) | |
1014 | rc = ISCSI_ERR_CONN_FAILED; | |
1015 | } else | |
1016 | mod_timer(&conn->transport_timer, jiffies + conn->recv_timeout); | |
1017 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); | |
1018 | return rc; | |
1019 | } | |
1020 | ||
62f38300 MC |
1021 | static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
1022 | char *data, int datalen) | |
1023 | { | |
1024 | struct iscsi_reject *reject = (struct iscsi_reject *)hdr; | |
1025 | struct iscsi_hdr rejected_pdu; | |
8afa1439 | 1026 | int opcode, rc = 0; |
62f38300 MC |
1027 | |
1028 | conn->exp_statsn = be32_to_cpu(reject->statsn) + 1; | |
1029 | ||
8afa1439 MC |
1030 | if (ntoh24(reject->dlength) > datalen || |
1031 | ntoh24(reject->dlength) < sizeof(struct iscsi_hdr)) { | |
1032 | iscsi_conn_printk(KERN_ERR, conn, "Cannot handle rejected " | |
1033 | "pdu. Invalid data length (pdu dlength " | |
1034 | "%u, datalen %d\n", ntoh24(reject->dlength), | |
1035 | datalen); | |
1036 | return ISCSI_ERR_PROTO; | |
1037 | } | |
1038 | memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr)); | |
1039 | opcode = rejected_pdu.opcode & ISCSI_OPCODE_MASK; | |
1040 | ||
1041 | switch (reject->reason) { | |
1042 | case ISCSI_REASON_DATA_DIGEST_ERROR: | |
1043 | iscsi_conn_printk(KERN_ERR, conn, | |
1044 | "pdu (op 0x%x itt 0x%x) rejected " | |
1045 | "due to DataDigest error.\n", | |
e5dbbe27 | 1046 | opcode, rejected_pdu.itt); |
8afa1439 MC |
1047 | break; |
1048 | case ISCSI_REASON_IMM_CMD_REJECT: | |
1049 | iscsi_conn_printk(KERN_ERR, conn, | |
1050 | "pdu (op 0x%x itt 0x%x) rejected. Too many " | |
1051 | "immediate commands.\n", | |
e5dbbe27 | 1052 | opcode, rejected_pdu.itt); |
8afa1439 MC |
1053 | /* |
1054 | * We only send one TMF at a time so if the target could not | |
1055 | * handle it, then it should get fixed (RFC mandates that | |
1056 | * a target can handle one immediate TMF per conn). | |
1057 | * | |
1058 | * For nops-outs, we could have sent more than one if | |
1059 | * the target is sending us lots of nop-ins | |
1060 | */ | |
1061 | if (opcode != ISCSI_OP_NOOP_OUT) | |
1062 | return 0; | |
62f38300 | 1063 | |
659743b0 | 1064 | if (rejected_pdu.itt == cpu_to_be32(ISCSI_RESERVED_TAG)) { |
8afa1439 MC |
1065 | /* |
1066 | * nop-out in response to target's nop-out rejected. | |
1067 | * Just resend. | |
1068 | */ | |
659743b0 SP |
1069 | /* In RX path we are under back lock */ |
1070 | spin_unlock(&conn->session->back_lock); | |
1071 | spin_lock(&conn->session->frwd_lock); | |
8afa1439 MC |
1072 | iscsi_send_nopout(conn, |
1073 | (struct iscsi_nopin*)&rejected_pdu); | |
659743b0 SP |
1074 | spin_unlock(&conn->session->frwd_lock); |
1075 | spin_lock(&conn->session->back_lock); | |
1076 | } else { | |
8afa1439 MC |
1077 | struct iscsi_task *task; |
1078 | /* | |
1079 | * Our nop as ping got dropped. We know the target | |
1080 | * and transport are ok so just clean up | |
1081 | */ | |
1082 | task = iscsi_itt_to_task(conn, rejected_pdu.itt); | |
1083 | if (!task) { | |
1084 | iscsi_conn_printk(KERN_ERR, conn, | |
1085 | "Invalid pdu reject. Could " | |
1086 | "not lookup rejected task.\n"); | |
1087 | rc = ISCSI_ERR_BAD_ITT; | |
1088 | } else | |
1089 | rc = iscsi_nop_out_rsp(task, | |
1090 | (struct iscsi_nopin*)&rejected_pdu, | |
1091 | NULL, 0); | |
62f38300 | 1092 | } |
8afa1439 MC |
1093 | break; |
1094 | default: | |
1095 | iscsi_conn_printk(KERN_ERR, conn, | |
1096 | "pdu (op 0x%x itt 0x%x) rejected. Reason " | |
e5dbbe27 VC |
1097 | "code 0x%x\n", rejected_pdu.opcode, |
1098 | rejected_pdu.itt, reject->reason); | |
8afa1439 | 1099 | break; |
62f38300 | 1100 | } |
8afa1439 | 1101 | return rc; |
62f38300 MC |
1102 | } |
1103 | ||
913e5bf4 MC |
1104 | /** |
1105 | * iscsi_itt_to_task - look up task by itt | |
1106 | * @conn: iscsi connection | |
1107 | * @itt: itt | |
1108 | * | |
1109 | * This should be used for mgmt tasks like login and nops, or if | |
1110 | * the LDD's itt space does not include the session age. | |
1111 | * | |
659743b0 | 1112 | * The session back_lock must be held. |
913e5bf4 | 1113 | */ |
8f9256ce | 1114 | struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *conn, itt_t itt) |
913e5bf4 MC |
1115 | { |
1116 | struct iscsi_session *session = conn->session; | |
262ef636 | 1117 | int i; |
913e5bf4 MC |
1118 | |
1119 | if (itt == RESERVED_ITT) | |
1120 | return NULL; | |
1121 | ||
262ef636 MC |
1122 | if (session->tt->parse_pdu_itt) |
1123 | session->tt->parse_pdu_itt(conn, itt, &i, NULL); | |
1124 | else | |
1125 | i = get_itt(itt); | |
913e5bf4 MC |
1126 | if (i >= session->cmds_max) |
1127 | return NULL; | |
1128 | ||
1129 | return session->cmds[i]; | |
1130 | } | |
8f9256ce | 1131 | EXPORT_SYMBOL_GPL(iscsi_itt_to_task); |
913e5bf4 | 1132 | |
7996a778 MC |
1133 | /** |
1134 | * __iscsi_complete_pdu - complete pdu | |
1135 | * @conn: iscsi conn | |
1136 | * @hdr: iscsi header | |
1137 | * @data: data buffer | |
1138 | * @datalen: len of data buffer | |
1139 | * | |
1140 | * Completes pdu processing by freeing any resources allocated at | |
659743b0 | 1141 | * queuecommand or send generic. session back_lock must be held and verify |
7996a778 MC |
1142 | * itt must have been called. |
1143 | */ | |
913e5bf4 MC |
1144 | int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
1145 | char *data, int datalen) | |
7996a778 MC |
1146 | { |
1147 | struct iscsi_session *session = conn->session; | |
1148 | int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0; | |
9c19a7d0 | 1149 | struct iscsi_task *task; |
7996a778 MC |
1150 | uint32_t itt; |
1151 | ||
f6d5180c | 1152 | conn->last_recv = jiffies; |
0af967f5 MC |
1153 | rc = iscsi_verify_itt(conn, hdr->itt); |
1154 | if (rc) | |
1155 | return rc; | |
1156 | ||
b4377356 AV |
1157 | if (hdr->itt != RESERVED_ITT) |
1158 | itt = get_itt(hdr->itt); | |
7996a778 | 1159 | else |
b4377356 | 1160 | itt = ~0U; |
7996a778 | 1161 | |
1b2c7af8 MC |
1162 | ISCSI_DBG_SESSION(session, "[op 0x%x cid %d itt 0x%x len %d]\n", |
1163 | opcode, conn->id, itt, datalen); | |
7996a778 | 1164 | |
3e5c28ad | 1165 | if (itt == ~0U) { |
77a23c21 | 1166 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); |
62f38300 | 1167 | |
7996a778 MC |
1168 | switch(opcode) { |
1169 | case ISCSI_OP_NOOP_IN: | |
40527afe | 1170 | if (datalen) { |
7996a778 | 1171 | rc = ISCSI_ERR_PROTO; |
40527afe MC |
1172 | break; |
1173 | } | |
1174 | ||
b4377356 | 1175 | if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG)) |
40527afe MC |
1176 | break; |
1177 | ||
659743b0 SP |
1178 | /* In RX path we are under back lock */ |
1179 | spin_unlock(&session->back_lock); | |
1180 | spin_lock(&session->frwd_lock); | |
f6d5180c | 1181 | iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr); |
659743b0 SP |
1182 | spin_unlock(&session->frwd_lock); |
1183 | spin_lock(&session->back_lock); | |
7996a778 MC |
1184 | break; |
1185 | case ISCSI_OP_REJECT: | |
62f38300 MC |
1186 | rc = iscsi_handle_reject(conn, hdr, data, datalen); |
1187 | break; | |
7996a778 | 1188 | case ISCSI_OP_ASYNC_EVENT: |
8d2860b3 | 1189 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; |
5831c737 MC |
1190 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) |
1191 | rc = ISCSI_ERR_CONN_FAILED; | |
7996a778 MC |
1192 | break; |
1193 | default: | |
1194 | rc = ISCSI_ERR_BAD_OPCODE; | |
1195 | break; | |
1196 | } | |
3e5c28ad MC |
1197 | goto out; |
1198 | } | |
1199 | ||
3e5c28ad MC |
1200 | switch(opcode) { |
1201 | case ISCSI_OP_SCSI_CMD_RSP: | |
913e5bf4 MC |
1202 | case ISCSI_OP_SCSI_DATA_IN: |
1203 | task = iscsi_itt_to_ctask(conn, hdr->itt); | |
1204 | if (!task) | |
1205 | return ISCSI_ERR_BAD_ITT; | |
d355e57d | 1206 | task->last_xfer = jiffies; |
913e5bf4 MC |
1207 | break; |
1208 | case ISCSI_OP_R2T: | |
1209 | /* | |
1210 | * LLD handles R2Ts if they need to. | |
1211 | */ | |
1212 | return 0; | |
1213 | case ISCSI_OP_LOGOUT_RSP: | |
1214 | case ISCSI_OP_LOGIN_RSP: | |
1215 | case ISCSI_OP_TEXT_RSP: | |
1216 | case ISCSI_OP_SCSI_TMFUNC_RSP: | |
1217 | case ISCSI_OP_NOOP_IN: | |
1218 | task = iscsi_itt_to_task(conn, hdr->itt); | |
1219 | if (!task) | |
1220 | return ISCSI_ERR_BAD_ITT; | |
1221 | break; | |
1222 | default: | |
1223 | return ISCSI_ERR_BAD_OPCODE; | |
1224 | } | |
1225 | ||
1226 | switch(opcode) { | |
1227 | case ISCSI_OP_SCSI_CMD_RSP: | |
9c19a7d0 | 1228 | iscsi_scsi_cmd_rsp(conn, hdr, task, data, datalen); |
3e5c28ad MC |
1229 | break; |
1230 | case ISCSI_OP_SCSI_DATA_IN: | |
1d9edf02 | 1231 | iscsi_data_in_rsp(conn, hdr, task); |
3e5c28ad | 1232 | break; |
3e5c28ad MC |
1233 | case ISCSI_OP_LOGOUT_RSP: |
1234 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
1235 | if (datalen) { | |
1236 | rc = ISCSI_ERR_PROTO; | |
1237 | break; | |
1238 | } | |
1239 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
1240 | goto recv_pdu; | |
1241 | case ISCSI_OP_LOGIN_RSP: | |
1242 | case ISCSI_OP_TEXT_RSP: | |
1243 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
1244 | /* | |
1245 | * login related PDU's exp_statsn is handled in | |
1246 | * userspace | |
1247 | */ | |
1248 | goto recv_pdu; | |
1249 | case ISCSI_OP_SCSI_TMFUNC_RSP: | |
1250 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
1251 | if (datalen) { | |
1252 | rc = ISCSI_ERR_PROTO; | |
1253 | break; | |
1254 | } | |
1255 | ||
1256 | iscsi_tmf_rsp(conn, hdr); | |
b3cd5050 | 1257 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); |
3e5c28ad MC |
1258 | break; |
1259 | case ISCSI_OP_NOOP_IN: | |
1260 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
1261 | if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) { | |
1262 | rc = ISCSI_ERR_PROTO; | |
1263 | break; | |
1264 | } | |
1265 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
1266 | ||
8afa1439 MC |
1267 | rc = iscsi_nop_out_rsp(task, (struct iscsi_nopin*)hdr, |
1268 | data, datalen); | |
3e5c28ad MC |
1269 | break; |
1270 | default: | |
1271 | rc = ISCSI_ERR_BAD_OPCODE; | |
1272 | break; | |
1273 | } | |
7996a778 | 1274 | |
3e5c28ad MC |
1275 | out: |
1276 | return rc; | |
1277 | recv_pdu: | |
1278 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) | |
1279 | rc = ISCSI_ERR_CONN_FAILED; | |
b3cd5050 | 1280 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); |
7996a778 MC |
1281 | return rc; |
1282 | } | |
913e5bf4 | 1283 | EXPORT_SYMBOL_GPL(__iscsi_complete_pdu); |
7996a778 MC |
1284 | |
1285 | int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
1286 | char *data, int datalen) | |
1287 | { | |
1288 | int rc; | |
1289 | ||
659743b0 | 1290 | spin_lock(&conn->session->back_lock); |
7996a778 | 1291 | rc = __iscsi_complete_pdu(conn, hdr, data, datalen); |
659743b0 | 1292 | spin_unlock(&conn->session->back_lock); |
7996a778 MC |
1293 | return rc; |
1294 | } | |
1295 | EXPORT_SYMBOL_GPL(iscsi_complete_pdu); | |
1296 | ||
0af967f5 | 1297 | int iscsi_verify_itt(struct iscsi_conn *conn, itt_t itt) |
7996a778 MC |
1298 | { |
1299 | struct iscsi_session *session = conn->session; | |
262ef636 | 1300 | int age = 0, i = 0; |
7996a778 | 1301 | |
0af967f5 MC |
1302 | if (itt == RESERVED_ITT) |
1303 | return 0; | |
7996a778 | 1304 | |
262ef636 MC |
1305 | if (session->tt->parse_pdu_itt) |
1306 | session->tt->parse_pdu_itt(conn, itt, &i, &age); | |
1307 | else { | |
1308 | i = get_itt(itt); | |
1309 | age = ((__force u32)itt >> ISCSI_AGE_SHIFT) & ISCSI_AGE_MASK; | |
1310 | } | |
1311 | ||
1312 | if (age != session->age) { | |
0af967f5 MC |
1313 | iscsi_conn_printk(KERN_ERR, conn, |
1314 | "received itt %x expected session age (%x)\n", | |
913e5bf4 | 1315 | (__force u32)itt, session->age); |
0af967f5 MC |
1316 | return ISCSI_ERR_BAD_ITT; |
1317 | } | |
7996a778 | 1318 | |
3e5c28ad MC |
1319 | if (i >= session->cmds_max) { |
1320 | iscsi_conn_printk(KERN_ERR, conn, | |
1321 | "received invalid itt index %u (max cmds " | |
1322 | "%u.\n", i, session->cmds_max); | |
1323 | return ISCSI_ERR_BAD_ITT; | |
7996a778 | 1324 | } |
7996a778 MC |
1325 | return 0; |
1326 | } | |
1327 | EXPORT_SYMBOL_GPL(iscsi_verify_itt); | |
1328 | ||
913e5bf4 MC |
1329 | /** |
1330 | * iscsi_itt_to_ctask - look up ctask by itt | |
1331 | * @conn: iscsi connection | |
1332 | * @itt: itt | |
1333 | * | |
1334 | * This should be used for cmd tasks. | |
1335 | * | |
659743b0 | 1336 | * The session back_lock must be held. |
913e5bf4 MC |
1337 | */ |
1338 | struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *conn, itt_t itt) | |
0af967f5 | 1339 | { |
9c19a7d0 | 1340 | struct iscsi_task *task; |
0af967f5 MC |
1341 | |
1342 | if (iscsi_verify_itt(conn, itt)) | |
1343 | return NULL; | |
1344 | ||
913e5bf4 MC |
1345 | task = iscsi_itt_to_task(conn, itt); |
1346 | if (!task || !task->sc) | |
0af967f5 MC |
1347 | return NULL; |
1348 | ||
913e5bf4 MC |
1349 | if (task->sc->SCp.phase != conn->session->age) { |
1350 | iscsi_session_printk(KERN_ERR, conn->session, | |
1351 | "task's session age %d, expected %d\n", | |
1352 | task->sc->SCp.phase, conn->session->age); | |
0af967f5 | 1353 | return NULL; |
913e5bf4 | 1354 | } |
0af967f5 | 1355 | |
9c19a7d0 | 1356 | return task; |
0af967f5 MC |
1357 | } |
1358 | EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask); | |
1359 | ||
40a06e75 | 1360 | void iscsi_session_failure(struct iscsi_session *session, |
e5bd7b54 MC |
1361 | enum iscsi_err err) |
1362 | { | |
e5bd7b54 MC |
1363 | struct iscsi_conn *conn; |
1364 | struct device *dev; | |
e5bd7b54 | 1365 | |
659743b0 | 1366 | spin_lock_bh(&session->frwd_lock); |
e5bd7b54 MC |
1367 | conn = session->leadconn; |
1368 | if (session->state == ISCSI_STATE_TERMINATE || !conn) { | |
659743b0 | 1369 | spin_unlock_bh(&session->frwd_lock); |
e5bd7b54 MC |
1370 | return; |
1371 | } | |
1372 | ||
1373 | dev = get_device(&conn->cls_conn->dev); | |
659743b0 | 1374 | spin_unlock_bh(&session->frwd_lock); |
e5bd7b54 MC |
1375 | if (!dev) |
1376 | return; | |
1377 | /* | |
1378 | * if the host is being removed bypass the connection | |
1379 | * recovery initialization because we are going to kill | |
1380 | * the session. | |
1381 | */ | |
1382 | if (err == ISCSI_ERR_INVALID_HOST) | |
1383 | iscsi_conn_error_event(conn->cls_conn, err); | |
1384 | else | |
1385 | iscsi_conn_failure(conn, err); | |
1386 | put_device(dev); | |
1387 | } | |
1388 | EXPORT_SYMBOL_GPL(iscsi_session_failure); | |
1389 | ||
7996a778 MC |
1390 | void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err) |
1391 | { | |
1392 | struct iscsi_session *session = conn->session; | |
7996a778 | 1393 | |
659743b0 | 1394 | spin_lock_bh(&session->frwd_lock); |
656cffc9 | 1395 | if (session->state == ISCSI_STATE_FAILED) { |
659743b0 | 1396 | spin_unlock_bh(&session->frwd_lock); |
656cffc9 MC |
1397 | return; |
1398 | } | |
1399 | ||
67a61114 | 1400 | if (conn->stop_stage == 0) |
7996a778 | 1401 | session->state = ISCSI_STATE_FAILED; |
659743b0 | 1402 | spin_unlock_bh(&session->frwd_lock); |
e5bd7b54 | 1403 | |
7996a778 MC |
1404 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); |
1405 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
e5bd7b54 | 1406 | iscsi_conn_error_event(conn->cls_conn, err); |
7996a778 MC |
1407 | } |
1408 | EXPORT_SYMBOL_GPL(iscsi_conn_failure); | |
1409 | ||
77a23c21 MC |
1410 | static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn) |
1411 | { | |
1412 | struct iscsi_session *session = conn->session; | |
1413 | ||
1414 | /* | |
1415 | * Check for iSCSI window and take care of CmdSN wrap-around | |
1416 | */ | |
e0726407 | 1417 | if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) { |
1b2c7af8 MC |
1418 | ISCSI_DBG_SESSION(session, "iSCSI CmdSN closed. ExpCmdSn " |
1419 | "%u MaxCmdSN %u CmdSN %u/%u\n", | |
1420 | session->exp_cmdsn, session->max_cmdsn, | |
1421 | session->cmdsn, session->queued_cmdsn); | |
77a23c21 MC |
1422 | return -ENOSPC; |
1423 | } | |
1424 | return 0; | |
1425 | } | |
1426 | ||
9c19a7d0 | 1427 | static int iscsi_xmit_task(struct iscsi_conn *conn) |
77a23c21 | 1428 | { |
9c19a7d0 | 1429 | struct iscsi_task *task = conn->task; |
843c0a8a | 1430 | int rc; |
77a23c21 | 1431 | |
70b31c15 MC |
1432 | if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) |
1433 | return -ENODATA; | |
1434 | ||
9c19a7d0 | 1435 | __iscsi_get_task(task); |
659743b0 | 1436 | spin_unlock_bh(&conn->session->frwd_lock); |
9c19a7d0 | 1437 | rc = conn->session->tt->xmit_task(task); |
659743b0 | 1438 | spin_lock_bh(&conn->session->frwd_lock); |
d355e57d | 1439 | if (!rc) { |
9c19a7d0 | 1440 | /* done with this task */ |
d355e57d | 1441 | task->last_xfer = jiffies; |
9c19a7d0 | 1442 | conn->task = NULL; |
d355e57d | 1443 | } |
659743b0 SP |
1444 | /* regular RX path uses back_lock */ |
1445 | spin_lock_bh(&conn->session->back_lock); | |
d355e57d | 1446 | __iscsi_put_task(task); |
659743b0 | 1447 | spin_unlock_bh(&conn->session->back_lock); |
77a23c21 MC |
1448 | return rc; |
1449 | } | |
1450 | ||
843c0a8a | 1451 | /** |
9c19a7d0 MC |
1452 | * iscsi_requeue_task - requeue task to run from session workqueue |
1453 | * @task: task to requeue | |
843c0a8a | 1454 | * |
9c19a7d0 | 1455 | * LLDs that need to run a task from the session workqueue should call |
659743b0 | 1456 | * this. The session frwd_lock must be held. This should only be called |
052d0144 | 1457 | * by software drivers. |
843c0a8a | 1458 | */ |
9c19a7d0 | 1459 | void iscsi_requeue_task(struct iscsi_task *task) |
843c0a8a | 1460 | { |
9c19a7d0 | 1461 | struct iscsi_conn *conn = task->conn; |
843c0a8a | 1462 | |
3bbaaad9 MC |
1463 | /* |
1464 | * this may be on the requeue list already if the xmit_task callout | |
1465 | * is handling the r2ts while we are adding new ones | |
1466 | */ | |
1467 | if (list_empty(&task->running)) | |
1468 | list_add_tail(&task->running, &conn->requeue); | |
32ae763e | 1469 | iscsi_conn_queue_work(conn); |
843c0a8a | 1470 | } |
9c19a7d0 | 1471 | EXPORT_SYMBOL_GPL(iscsi_requeue_task); |
843c0a8a | 1472 | |
7996a778 MC |
1473 | /** |
1474 | * iscsi_data_xmit - xmit any command into the scheduled connection | |
1475 | * @conn: iscsi connection | |
1476 | * | |
1477 | * Notes: | |
1478 | * The function can return -EAGAIN in which case the caller must | |
1479 | * re-schedule it again later or recover. '0' return code means | |
1480 | * successful xmit. | |
1481 | **/ | |
1482 | static int iscsi_data_xmit(struct iscsi_conn *conn) | |
1483 | { | |
5d12c05e | 1484 | struct iscsi_task *task; |
3219e529 | 1485 | int rc = 0; |
7996a778 | 1486 | |
659743b0 | 1487 | spin_lock_bh(&conn->session->frwd_lock); |
70b31c15 | 1488 | if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) { |
1b2c7af8 | 1489 | ISCSI_DBG_SESSION(conn->session, "Tx suspended!\n"); |
659743b0 | 1490 | spin_unlock_bh(&conn->session->frwd_lock); |
3219e529 | 1491 | return -ENODATA; |
7996a778 | 1492 | } |
7996a778 | 1493 | |
9c19a7d0 MC |
1494 | if (conn->task) { |
1495 | rc = iscsi_xmit_task(conn); | |
3219e529 | 1496 | if (rc) |
70b31c15 | 1497 | goto done; |
7996a778 MC |
1498 | } |
1499 | ||
77a23c21 MC |
1500 | /* |
1501 | * process mgmt pdus like nops before commands since we should | |
1502 | * only have one nop-out as a ping from us and targets should not | |
1503 | * overflow us with nop-ins | |
1504 | */ | |
1505 | check_mgmt: | |
843c0a8a | 1506 | while (!list_empty(&conn->mgmtqueue)) { |
9c19a7d0 MC |
1507 | conn->task = list_entry(conn->mgmtqueue.next, |
1508 | struct iscsi_task, running); | |
3bbaaad9 | 1509 | list_del_init(&conn->task->running); |
9c19a7d0 | 1510 | if (iscsi_prep_mgmt_task(conn, conn->task)) { |
659743b0 SP |
1511 | /* regular RX path uses back_lock */ |
1512 | spin_lock_bh(&conn->session->back_lock); | |
9c19a7d0 | 1513 | __iscsi_put_task(conn->task); |
659743b0 | 1514 | spin_unlock_bh(&conn->session->back_lock); |
9c19a7d0 | 1515 | conn->task = NULL; |
b3a7ea8d MC |
1516 | continue; |
1517 | } | |
9c19a7d0 | 1518 | rc = iscsi_xmit_task(conn); |
77a23c21 | 1519 | if (rc) |
70b31c15 | 1520 | goto done; |
7996a778 MC |
1521 | } |
1522 | ||
843c0a8a | 1523 | /* process pending command queue */ |
3bbaaad9 | 1524 | while (!list_empty(&conn->cmdqueue)) { |
5d12c05e MC |
1525 | conn->task = list_entry(conn->cmdqueue.next, struct iscsi_task, |
1526 | running); | |
3bbaaad9 | 1527 | list_del_init(&conn->task->running); |
b3a7ea8d | 1528 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) { |
b3cd5050 | 1529 | fail_scsi_task(conn->task, DID_IMM_RETRY); |
b3a7ea8d MC |
1530 | continue; |
1531 | } | |
577577da MC |
1532 | rc = iscsi_prep_scsi_cmd_pdu(conn->task); |
1533 | if (rc) { | |
5d12c05e | 1534 | if (rc == -ENOMEM || rc == -EACCES) { |
3bbaaad9 MC |
1535 | list_add_tail(&conn->task->running, |
1536 | &conn->cmdqueue); | |
577577da | 1537 | conn->task = NULL; |
70b31c15 | 1538 | goto done; |
577577da | 1539 | } else |
b3cd5050 | 1540 | fail_scsi_task(conn->task, DID_ABORT); |
004d6530 BH |
1541 | continue; |
1542 | } | |
9c19a7d0 | 1543 | rc = iscsi_xmit_task(conn); |
77a23c21 | 1544 | if (rc) |
70b31c15 | 1545 | goto done; |
77a23c21 | 1546 | /* |
9c19a7d0 | 1547 | * we could continuously get new task requests so |
77a23c21 MC |
1548 | * we need to check the mgmt queue for nops that need to |
1549 | * be sent to aviod starvation | |
1550 | */ | |
843c0a8a MC |
1551 | if (!list_empty(&conn->mgmtqueue)) |
1552 | goto check_mgmt; | |
1553 | } | |
1554 | ||
1555 | while (!list_empty(&conn->requeue)) { | |
b3a7ea8d MC |
1556 | /* |
1557 | * we always do fastlogout - conn stop code will clean up. | |
1558 | */ | |
1559 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) | |
1560 | break; | |
1561 | ||
5d12c05e MC |
1562 | task = list_entry(conn->requeue.next, struct iscsi_task, |
1563 | running); | |
1564 | if (iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_DATA_OUT)) | |
1565 | break; | |
1566 | ||
1567 | conn->task = task; | |
3bbaaad9 | 1568 | list_del_init(&conn->task->running); |
9c19a7d0 | 1569 | conn->task->state = ISCSI_TASK_RUNNING; |
9c19a7d0 | 1570 | rc = iscsi_xmit_task(conn); |
843c0a8a | 1571 | if (rc) |
70b31c15 | 1572 | goto done; |
843c0a8a | 1573 | if (!list_empty(&conn->mgmtqueue)) |
77a23c21 | 1574 | goto check_mgmt; |
7996a778 | 1575 | } |
659743b0 | 1576 | spin_unlock_bh(&conn->session->frwd_lock); |
3219e529 | 1577 | return -ENODATA; |
7996a778 | 1578 | |
70b31c15 | 1579 | done: |
659743b0 | 1580 | spin_unlock_bh(&conn->session->frwd_lock); |
3219e529 | 1581 | return rc; |
7996a778 MC |
1582 | } |
1583 | ||
c4028958 | 1584 | static void iscsi_xmitworker(struct work_struct *work) |
7996a778 | 1585 | { |
c4028958 DH |
1586 | struct iscsi_conn *conn = |
1587 | container_of(work, struct iscsi_conn, xmitwork); | |
3219e529 | 1588 | int rc; |
7996a778 MC |
1589 | /* |
1590 | * serialize Xmit worker on a per-connection basis. | |
1591 | */ | |
3219e529 MC |
1592 | do { |
1593 | rc = iscsi_data_xmit(conn); | |
1594 | } while (rc >= 0 || rc == -EAGAIN); | |
7996a778 MC |
1595 | } |
1596 | ||
577577da MC |
1597 | static inline struct iscsi_task *iscsi_alloc_task(struct iscsi_conn *conn, |
1598 | struct scsi_cmnd *sc) | |
1599 | { | |
1600 | struct iscsi_task *task; | |
1601 | ||
7acd72eb | 1602 | if (!kfifo_out(&conn->session->cmdpool.queue, |
577577da MC |
1603 | (void *) &task, sizeof(void *))) |
1604 | return NULL; | |
1605 | ||
1606 | sc->SCp.phase = conn->session->age; | |
1607 | sc->SCp.ptr = (char *) task; | |
1608 | ||
1609 | atomic_set(&task->refcount, 1); | |
1610 | task->state = ISCSI_TASK_PENDING; | |
1611 | task->conn = conn; | |
1612 | task->sc = sc; | |
d355e57d MC |
1613 | task->have_checked_conn = false; |
1614 | task->last_timeout = jiffies; | |
1615 | task->last_xfer = jiffies; | |
55e51eda | 1616 | task->protected = false; |
577577da MC |
1617 | INIT_LIST_HEAD(&task->running); |
1618 | return task; | |
1619 | } | |
1620 | ||
7996a778 MC |
1621 | enum { |
1622 | FAILURE_BAD_HOST = 1, | |
1623 | FAILURE_SESSION_FAILED, | |
1624 | FAILURE_SESSION_FREED, | |
1625 | FAILURE_WINDOW_CLOSED, | |
60ecebf5 | 1626 | FAILURE_OOM, |
7996a778 | 1627 | FAILURE_SESSION_TERMINATE, |
656cffc9 | 1628 | FAILURE_SESSION_IN_RECOVERY, |
7996a778 | 1629 | FAILURE_SESSION_RECOVERY_TIMEOUT, |
b3a7ea8d | 1630 | FAILURE_SESSION_LOGGING_OUT, |
6eabafbe | 1631 | FAILURE_SESSION_NOT_READY, |
7996a778 MC |
1632 | }; |
1633 | ||
f41d4721 | 1634 | int iscsi_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc) |
7996a778 | 1635 | { |
75613521 | 1636 | struct iscsi_cls_session *cls_session; |
1336aed1 | 1637 | struct iscsi_host *ihost; |
7996a778 MC |
1638 | int reason = 0; |
1639 | struct iscsi_session *session; | |
1640 | struct iscsi_conn *conn; | |
9c19a7d0 | 1641 | struct iscsi_task *task = NULL; |
7996a778 | 1642 | |
7996a778 | 1643 | sc->result = 0; |
f47f2cf5 | 1644 | sc->SCp.ptr = NULL; |
7996a778 | 1645 | |
1336aed1 | 1646 | ihost = shost_priv(host); |
7996a778 | 1647 | |
75613521 MC |
1648 | cls_session = starget_to_session(scsi_target(sc->device)); |
1649 | session = cls_session->dd_data; | |
659743b0 | 1650 | spin_lock_bh(&session->frwd_lock); |
7996a778 | 1651 | |
75613521 | 1652 | reason = iscsi_session_chkready(cls_session); |
6eabafbe MC |
1653 | if (reason) { |
1654 | sc->result = reason; | |
1655 | goto fault; | |
1656 | } | |
1657 | ||
301e0f7e | 1658 | if (session->state != ISCSI_STATE_LOGGED_IN) { |
656cffc9 MC |
1659 | /* |
1660 | * to handle the race between when we set the recovery state | |
1661 | * and block the session we requeue here (commands could | |
1662 | * be entering our queuecommand while a block is starting | |
1663 | * up because the block code is not locked) | |
1664 | */ | |
9000bcd6 | 1665 | switch (session->state) { |
301e0f7e | 1666 | case ISCSI_STATE_FAILED: |
9000bcd6 | 1667 | case ISCSI_STATE_IN_RECOVERY: |
656cffc9 | 1668 | reason = FAILURE_SESSION_IN_RECOVERY; |
301e0f7e MC |
1669 | sc->result = DID_IMM_RETRY << 16; |
1670 | break; | |
9000bcd6 MC |
1671 | case ISCSI_STATE_LOGGING_OUT: |
1672 | reason = FAILURE_SESSION_LOGGING_OUT; | |
301e0f7e MC |
1673 | sc->result = DID_IMM_RETRY << 16; |
1674 | break; | |
b3a7ea8d | 1675 | case ISCSI_STATE_RECOVERY_FAILED: |
656cffc9 | 1676 | reason = FAILURE_SESSION_RECOVERY_TIMEOUT; |
56d7fcfa | 1677 | sc->result = DID_TRANSPORT_FAILFAST << 16; |
b3a7ea8d MC |
1678 | break; |
1679 | case ISCSI_STATE_TERMINATE: | |
656cffc9 | 1680 | reason = FAILURE_SESSION_TERMINATE; |
6eabafbe | 1681 | sc->result = DID_NO_CONNECT << 16; |
b3a7ea8d | 1682 | break; |
b3a7ea8d | 1683 | default: |
656cffc9 | 1684 | reason = FAILURE_SESSION_FREED; |
6eabafbe | 1685 | sc->result = DID_NO_CONNECT << 16; |
b3a7ea8d | 1686 | } |
7996a778 MC |
1687 | goto fault; |
1688 | } | |
1689 | ||
7996a778 | 1690 | conn = session->leadconn; |
98644047 MC |
1691 | if (!conn) { |
1692 | reason = FAILURE_SESSION_FREED; | |
6eabafbe | 1693 | sc->result = DID_NO_CONNECT << 16; |
98644047 MC |
1694 | goto fault; |
1695 | } | |
7996a778 | 1696 | |
661134ad MC |
1697 | if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) { |
1698 | reason = FAILURE_SESSION_IN_RECOVERY; | |
1699 | sc->result = DID_REQUEUE; | |
1700 | goto fault; | |
1701 | } | |
1702 | ||
77a23c21 MC |
1703 | if (iscsi_check_cmdsn_window_closed(conn)) { |
1704 | reason = FAILURE_WINDOW_CLOSED; | |
1705 | goto reject; | |
1706 | } | |
1707 | ||
577577da MC |
1708 | task = iscsi_alloc_task(conn, sc); |
1709 | if (!task) { | |
60ecebf5 MC |
1710 | reason = FAILURE_OOM; |
1711 | goto reject; | |
1712 | } | |
7996a778 | 1713 | |
1336aed1 | 1714 | if (!ihost->workq) { |
577577da MC |
1715 | reason = iscsi_prep_scsi_cmd_pdu(task); |
1716 | if (reason) { | |
5d12c05e | 1717 | if (reason == -ENOMEM || reason == -EACCES) { |
577577da MC |
1718 | reason = FAILURE_OOM; |
1719 | goto prepd_reject; | |
1720 | } else { | |
1721 | sc->result = DID_ABORT << 16; | |
1722 | goto prepd_fault; | |
1723 | } | |
052d0144 | 1724 | } |
9c19a7d0 | 1725 | if (session->tt->xmit_task(task)) { |
d3305f34 | 1726 | session->cmdsn--; |
052d0144 | 1727 | reason = FAILURE_SESSION_NOT_READY; |
577577da | 1728 | goto prepd_reject; |
052d0144 | 1729 | } |
3bbaaad9 MC |
1730 | } else { |
1731 | list_add_tail(&task->running, &conn->cmdqueue); | |
32ae763e | 1732 | iscsi_conn_queue_work(conn); |
3bbaaad9 | 1733 | } |
052d0144 MC |
1734 | |
1735 | session->queued_cmdsn++; | |
659743b0 | 1736 | spin_unlock_bh(&session->frwd_lock); |
7996a778 MC |
1737 | return 0; |
1738 | ||
577577da | 1739 | prepd_reject: |
f41d4721 | 1740 | iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ); |
7996a778 | 1741 | reject: |
659743b0 | 1742 | spin_unlock_bh(&session->frwd_lock); |
1b2c7af8 MC |
1743 | ISCSI_DBG_SESSION(session, "cmd 0x%x rejected (%d)\n", |
1744 | sc->cmnd[0], reason); | |
d6d13ee1 | 1745 | return SCSI_MLQUEUE_TARGET_BUSY; |
7996a778 | 1746 | |
577577da | 1747 | prepd_fault: |
f41d4721 | 1748 | iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ); |
7996a778 | 1749 | fault: |
659743b0 | 1750 | spin_unlock_bh(&session->frwd_lock); |
1b2c7af8 MC |
1751 | ISCSI_DBG_SESSION(session, "iscsi: cmd 0x%x is not queued (%d)\n", |
1752 | sc->cmnd[0], reason); | |
c07d4444 BH |
1753 | if (!scsi_bidi_cmnd(sc)) |
1754 | scsi_set_resid(sc, scsi_bufflen(sc)); | |
1755 | else { | |
1756 | scsi_out(sc)->resid = scsi_out(sc)->length; | |
1757 | scsi_in(sc)->resid = scsi_in(sc)->length; | |
1758 | } | |
f41d4721 | 1759 | sc->scsi_done(sc); |
7996a778 MC |
1760 | return 0; |
1761 | } | |
1762 | EXPORT_SYMBOL_GPL(iscsi_queuecommand); | |
1763 | ||
e881a172 | 1764 | int iscsi_change_queue_depth(struct scsi_device *sdev, int depth, int reason) |
7996a778 | 1765 | { |
1796e722 MC |
1766 | switch (reason) { |
1767 | case SCSI_QDEPTH_DEFAULT: | |
1768 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); | |
1769 | break; | |
1770 | case SCSI_QDEPTH_QFULL: | |
1771 | scsi_track_queue_full(sdev, depth); | |
1772 | break; | |
1773 | case SCSI_QDEPTH_RAMP_UP: | |
1774 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); | |
1775 | break; | |
1776 | default: | |
e881a172 | 1777 | return -EOPNOTSUPP; |
1796e722 | 1778 | } |
7996a778 MC |
1779 | return sdev->queue_depth; |
1780 | } | |
1781 | EXPORT_SYMBOL_GPL(iscsi_change_queue_depth); | |
1782 | ||
6b5d6c44 MC |
1783 | int iscsi_target_alloc(struct scsi_target *starget) |
1784 | { | |
1785 | struct iscsi_cls_session *cls_session = starget_to_session(starget); | |
1786 | struct iscsi_session *session = cls_session->dd_data; | |
1787 | ||
1788 | starget->can_queue = session->scsi_cmds_max; | |
1789 | return 0; | |
1790 | } | |
1791 | EXPORT_SYMBOL_GPL(iscsi_target_alloc); | |
1792 | ||
843c0a8a | 1793 | static void iscsi_tmf_timedout(unsigned long data) |
7996a778 | 1794 | { |
843c0a8a | 1795 | struct iscsi_conn *conn = (struct iscsi_conn *)data; |
7996a778 MC |
1796 | struct iscsi_session *session = conn->session; |
1797 | ||
659743b0 | 1798 | spin_lock(&session->frwd_lock); |
843c0a8a MC |
1799 | if (conn->tmf_state == TMF_QUEUED) { |
1800 | conn->tmf_state = TMF_TIMEDOUT; | |
bd2199d4 | 1801 | ISCSI_DBG_EH(session, "tmf timedout\n"); |
7996a778 MC |
1802 | /* unblock eh_abort() */ |
1803 | wake_up(&conn->ehwait); | |
1804 | } | |
659743b0 | 1805 | spin_unlock(&session->frwd_lock); |
7996a778 MC |
1806 | } |
1807 | ||
9c19a7d0 | 1808 | static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn, |
f6d5180c MC |
1809 | struct iscsi_tm *hdr, int age, |
1810 | int timeout) | |
7996a778 | 1811 | { |
7996a778 | 1812 | struct iscsi_session *session = conn->session; |
9c19a7d0 | 1813 | struct iscsi_task *task; |
7996a778 | 1814 | |
9c19a7d0 | 1815 | task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr, |
843c0a8a | 1816 | NULL, 0); |
9c19a7d0 | 1817 | if (!task) { |
659743b0 | 1818 | spin_unlock_bh(&session->frwd_lock); |
df4da5cd | 1819 | iscsi_conn_printk(KERN_ERR, conn, "Could not send TMF.\n"); |
7996a778 | 1820 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
659743b0 | 1821 | spin_lock_bh(&session->frwd_lock); |
77a23c21 | 1822 | return -EPERM; |
7996a778 | 1823 | } |
843c0a8a | 1824 | conn->tmfcmd_pdus_cnt++; |
f6d5180c | 1825 | conn->tmf_timer.expires = timeout * HZ + jiffies; |
843c0a8a MC |
1826 | conn->tmf_timer.function = iscsi_tmf_timedout; |
1827 | conn->tmf_timer.data = (unsigned long)conn; | |
1828 | add_timer(&conn->tmf_timer); | |
bd2199d4 | 1829 | ISCSI_DBG_EH(session, "tmf set timeout\n"); |
7996a778 | 1830 | |
659743b0 | 1831 | spin_unlock_bh(&session->frwd_lock); |
6724add1 | 1832 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1833 | |
1834 | /* | |
1835 | * block eh thread until: | |
1836 | * | |
843c0a8a MC |
1837 | * 1) tmf response |
1838 | * 2) tmf timeout | |
7996a778 MC |
1839 | * 3) session is terminated or restarted or userspace has |
1840 | * given up on recovery | |
1841 | */ | |
843c0a8a | 1842 | wait_event_interruptible(conn->ehwait, age != session->age || |
7996a778 | 1843 | session->state != ISCSI_STATE_LOGGED_IN || |
843c0a8a | 1844 | conn->tmf_state != TMF_QUEUED); |
7996a778 MC |
1845 | if (signal_pending(current)) |
1846 | flush_signals(current); | |
843c0a8a MC |
1847 | del_timer_sync(&conn->tmf_timer); |
1848 | ||
6724add1 | 1849 | mutex_lock(&session->eh_mutex); |
659743b0 | 1850 | spin_lock_bh(&session->frwd_lock); |
9c19a7d0 | 1851 | /* if the session drops it will clean up the task */ |
843c0a8a MC |
1852 | if (age != session->age || |
1853 | session->state != ISCSI_STATE_LOGGED_IN) | |
1854 | return -ENOTCONN; | |
7996a778 MC |
1855 | return 0; |
1856 | } | |
1857 | ||
843c0a8a MC |
1858 | /* |
1859 | * Fail commands. session lock held and recv side suspended and xmit | |
1860 | * thread flushed | |
1861 | */ | |
3bbaaad9 MC |
1862 | static void fail_scsi_tasks(struct iscsi_conn *conn, unsigned lun, |
1863 | int error) | |
843c0a8a | 1864 | { |
3bbaaad9 MC |
1865 | struct iscsi_task *task; |
1866 | int i; | |
843c0a8a | 1867 | |
3bbaaad9 MC |
1868 | for (i = 0; i < conn->session->cmds_max; i++) { |
1869 | task = conn->session->cmds[i]; | |
1870 | if (!task->sc || task->state == ISCSI_TASK_FREE) | |
1871 | continue; | |
843c0a8a | 1872 | |
3bbaaad9 MC |
1873 | if (lun != -1 && lun != task->sc->device->lun) |
1874 | continue; | |
843c0a8a | 1875 | |
3bbaaad9 MC |
1876 | ISCSI_DBG_SESSION(conn->session, |
1877 | "failing sc %p itt 0x%x state %d\n", | |
1878 | task->sc, task->itt, task->state); | |
b3cd5050 | 1879 | fail_scsi_task(task, error); |
843c0a8a MC |
1880 | } |
1881 | } | |
1882 | ||
661134ad MC |
1883 | /** |
1884 | * iscsi_suspend_queue - suspend iscsi_queuecommand | |
1885 | * @conn: iscsi conn to stop queueing IO on | |
1886 | * | |
659743b0 | 1887 | * This grabs the session frwd_lock to make sure no one is in |
661134ad MC |
1888 | * xmit_task/queuecommand, and then sets suspend to prevent |
1889 | * new commands from being queued. This only needs to be called | |
1890 | * by offload drivers that need to sync a path like ep disconnect | |
1891 | * with the iscsi_queuecommand/xmit_task. To start IO again libiscsi | |
1892 | * will call iscsi_start_tx and iscsi_unblock_session when in FFP. | |
1893 | */ | |
1894 | void iscsi_suspend_queue(struct iscsi_conn *conn) | |
1895 | { | |
659743b0 | 1896 | spin_lock_bh(&conn->session->frwd_lock); |
661134ad | 1897 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); |
659743b0 | 1898 | spin_unlock_bh(&conn->session->frwd_lock); |
661134ad MC |
1899 | } |
1900 | EXPORT_SYMBOL_GPL(iscsi_suspend_queue); | |
1901 | ||
1902 | /** | |
1903 | * iscsi_suspend_tx - suspend iscsi_data_xmit | |
1904 | * @conn: iscsi conn tp stop processing IO on. | |
1905 | * | |
1906 | * This function sets the suspend bit to prevent iscsi_data_xmit | |
1907 | * from sending new IO, and if work is queued on the xmit thread | |
1908 | * it will wait for it to be completed. | |
1909 | */ | |
b40977d9 | 1910 | void iscsi_suspend_tx(struct iscsi_conn *conn) |
6724add1 | 1911 | { |
32ae763e MC |
1912 | struct Scsi_Host *shost = conn->session->host; |
1913 | struct iscsi_host *ihost = shost_priv(shost); | |
1914 | ||
6724add1 | 1915 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); |
1336aed1 | 1916 | if (ihost->workq) |
32ae763e | 1917 | flush_workqueue(ihost->workq); |
6724add1 | 1918 | } |
b40977d9 | 1919 | EXPORT_SYMBOL_GPL(iscsi_suspend_tx); |
6724add1 MC |
1920 | |
1921 | static void iscsi_start_tx(struct iscsi_conn *conn) | |
1922 | { | |
1923 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
1336aed1 | 1924 | iscsi_conn_queue_work(conn); |
6724add1 MC |
1925 | } |
1926 | ||
4c48a829 MC |
1927 | /* |
1928 | * We want to make sure a ping is in flight. It has timed out. | |
1929 | * And we are not busy processing a pdu that is making | |
1930 | * progress but got started before the ping and is taking a while | |
1931 | * to complete so the ping is just stuck behind it in a queue. | |
1932 | */ | |
1933 | static int iscsi_has_ping_timed_out(struct iscsi_conn *conn) | |
1934 | { | |
1935 | if (conn->ping_task && | |
1936 | time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) + | |
1937 | (conn->ping_timeout * HZ), jiffies)) | |
1938 | return 1; | |
1939 | else | |
1940 | return 0; | |
1941 | } | |
1942 | ||
d355e57d | 1943 | static enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *sc) |
f6d5180c | 1944 | { |
d355e57d | 1945 | enum blk_eh_timer_return rc = BLK_EH_NOT_HANDLED; |
92ed4d69 | 1946 | struct iscsi_task *task = NULL, *running_task; |
f6d5180c MC |
1947 | struct iscsi_cls_session *cls_session; |
1948 | struct iscsi_session *session; | |
1949 | struct iscsi_conn *conn; | |
92ed4d69 | 1950 | int i; |
f6d5180c | 1951 | |
d355e57d | 1952 | cls_session = starget_to_session(scsi_target(sc->device)); |
75613521 | 1953 | session = cls_session->dd_data; |
f6d5180c | 1954 | |
bd2199d4 | 1955 | ISCSI_DBG_EH(session, "scsi cmd %p timedout\n", sc); |
f6d5180c | 1956 | |
659743b0 | 1957 | spin_lock(&session->frwd_lock); |
e3d338a5 MC |
1958 | task = (struct iscsi_task *)sc->SCp.ptr; |
1959 | if (!task) { | |
1960 | /* | |
1961 | * Raced with completion. Blk layer has taken ownership | |
1962 | * so let timeout code complete it now. | |
1963 | */ | |
1964 | rc = BLK_EH_HANDLED; | |
1965 | goto done; | |
1966 | } | |
1967 | ||
f6d5180c MC |
1968 | if (session->state != ISCSI_STATE_LOGGED_IN) { |
1969 | /* | |
1970 | * We are probably in the middle of iscsi recovery so let | |
1971 | * that complete and handle the error. | |
1972 | */ | |
242f9dcb | 1973 | rc = BLK_EH_RESET_TIMER; |
f6d5180c MC |
1974 | goto done; |
1975 | } | |
1976 | ||
1977 | conn = session->leadconn; | |
1978 | if (!conn) { | |
1979 | /* In the middle of shuting down */ | |
242f9dcb | 1980 | rc = BLK_EH_RESET_TIMER; |
f6d5180c MC |
1981 | goto done; |
1982 | } | |
1983 | ||
d355e57d MC |
1984 | /* |
1985 | * If we have sent (at least queued to the network layer) a pdu or | |
1986 | * recvd one for the task since the last timeout ask for | |
1987 | * more time. If on the next timeout we have not made progress | |
1988 | * we can check if it is the task or connection when we send the | |
1989 | * nop as a ping. | |
1990 | */ | |
92ed4d69 | 1991 | if (time_after(task->last_xfer, task->last_timeout)) { |
bd2199d4 EZ |
1992 | ISCSI_DBG_EH(session, "Command making progress. Asking " |
1993 | "scsi-ml for more time to complete. " | |
92ed4d69 | 1994 | "Last data xfer at %lu. Last timeout was at " |
bd2199d4 | 1995 | "%lu\n.", task->last_xfer, task->last_timeout); |
d355e57d MC |
1996 | task->have_checked_conn = false; |
1997 | rc = BLK_EH_RESET_TIMER; | |
1998 | goto done; | |
1999 | } | |
2000 | ||
f6d5180c MC |
2001 | if (!conn->recv_timeout && !conn->ping_timeout) |
2002 | goto done; | |
2003 | /* | |
2004 | * if the ping timedout then we are in the middle of cleaning up | |
2005 | * and can let the iscsi eh handle it | |
2006 | */ | |
4c48a829 | 2007 | if (iscsi_has_ping_timed_out(conn)) { |
242f9dcb | 2008 | rc = BLK_EH_RESET_TIMER; |
4c48a829 MC |
2009 | goto done; |
2010 | } | |
d355e57d | 2011 | |
92ed4d69 MC |
2012 | for (i = 0; i < conn->session->cmds_max; i++) { |
2013 | running_task = conn->session->cmds[i]; | |
2014 | if (!running_task->sc || running_task == task || | |
2015 | running_task->state != ISCSI_TASK_RUNNING) | |
2016 | continue; | |
2017 | ||
2018 | /* | |
2019 | * Only check if cmds started before this one have made | |
2020 | * progress, or this could never fail | |
2021 | */ | |
2022 | if (time_after(running_task->sc->jiffies_at_alloc, | |
2023 | task->sc->jiffies_at_alloc)) | |
2024 | continue; | |
2025 | ||
2026 | if (time_after(running_task->last_xfer, task->last_timeout)) { | |
2027 | /* | |
2028 | * This task has not made progress, but a task | |
2029 | * started before us has transferred data since | |
2030 | * we started/last-checked. We could be queueing | |
2031 | * too many tasks or the LU is bad. | |
2032 | * | |
2033 | * If the device is bad the cmds ahead of us on | |
2034 | * other devs will complete, and this loop will | |
2035 | * eventually fail starting the scsi eh. | |
2036 | */ | |
2037 | ISCSI_DBG_EH(session, "Command has not made progress " | |
2038 | "but commands ahead of it have. " | |
2039 | "Asking scsi-ml for more time to " | |
2040 | "complete. Our last xfer vs running task " | |
2041 | "last xfer %lu/%lu. Last check %lu.\n", | |
2042 | task->last_xfer, running_task->last_xfer, | |
2043 | task->last_timeout); | |
2044 | rc = BLK_EH_RESET_TIMER; | |
2045 | goto done; | |
2046 | } | |
2047 | } | |
2048 | ||
d355e57d MC |
2049 | /* Assumes nop timeout is shorter than scsi cmd timeout */ |
2050 | if (task->have_checked_conn) | |
2051 | goto done; | |
2052 | ||
f6d5180c | 2053 | /* |
d355e57d MC |
2054 | * Checking the transport already or nop from a cmd timeout still |
2055 | * running | |
f6d5180c | 2056 | */ |
d355e57d MC |
2057 | if (conn->ping_task) { |
2058 | task->have_checked_conn = true; | |
242f9dcb | 2059 | rc = BLK_EH_RESET_TIMER; |
4c48a829 MC |
2060 | goto done; |
2061 | } | |
2062 | ||
d355e57d MC |
2063 | /* Make sure there is a transport check done */ |
2064 | iscsi_send_nopout(conn, NULL); | |
2065 | task->have_checked_conn = true; | |
2066 | rc = BLK_EH_RESET_TIMER; | |
2067 | ||
f6d5180c | 2068 | done: |
d355e57d MC |
2069 | if (task) |
2070 | task->last_timeout = jiffies; | |
659743b0 | 2071 | spin_unlock(&session->frwd_lock); |
bd2199d4 EZ |
2072 | ISCSI_DBG_EH(session, "return %s\n", rc == BLK_EH_RESET_TIMER ? |
2073 | "timer reset" : "nh"); | |
f6d5180c MC |
2074 | return rc; |
2075 | } | |
2076 | ||
2077 | static void iscsi_check_transport_timeouts(unsigned long data) | |
2078 | { | |
2079 | struct iscsi_conn *conn = (struct iscsi_conn *)data; | |
2080 | struct iscsi_session *session = conn->session; | |
4cf10435 | 2081 | unsigned long recv_timeout, next_timeout = 0, last_recv; |
f6d5180c | 2082 | |
659743b0 | 2083 | spin_lock(&session->frwd_lock); |
f6d5180c MC |
2084 | if (session->state != ISCSI_STATE_LOGGED_IN) |
2085 | goto done; | |
2086 | ||
4cf10435 MC |
2087 | recv_timeout = conn->recv_timeout; |
2088 | if (!recv_timeout) | |
f6d5180c MC |
2089 | goto done; |
2090 | ||
4cf10435 | 2091 | recv_timeout *= HZ; |
f6d5180c | 2092 | last_recv = conn->last_recv; |
4c48a829 MC |
2093 | |
2094 | if (iscsi_has_ping_timed_out(conn)) { | |
322d739d | 2095 | iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs " |
4c48a829 MC |
2096 | "expired, recv timeout %d, last rx %lu, " |
2097 | "last ping %lu, now %lu\n", | |
2098 | conn->ping_timeout, conn->recv_timeout, | |
2099 | last_recv, conn->last_ping, jiffies); | |
659743b0 | 2100 | spin_unlock(&session->frwd_lock); |
f6d5180c MC |
2101 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
2102 | return; | |
2103 | } | |
2104 | ||
4cf10435 | 2105 | if (time_before_eq(last_recv + recv_timeout, jiffies)) { |
c8611f97 | 2106 | /* send a ping to try to provoke some traffic */ |
1b2c7af8 | 2107 | ISCSI_DBG_CONN(conn, "Sending nopout as ping\n"); |
c8611f97 | 2108 | iscsi_send_nopout(conn, NULL); |
4cf10435 | 2109 | next_timeout = conn->last_ping + (conn->ping_timeout * HZ); |
ad294e9c | 2110 | } else |
4cf10435 | 2111 | next_timeout = last_recv + recv_timeout; |
f6d5180c | 2112 | |
1b2c7af8 | 2113 | ISCSI_DBG_CONN(conn, "Setting next tmo %lu\n", next_timeout); |
ad294e9c | 2114 | mod_timer(&conn->transport_timer, next_timeout); |
f6d5180c | 2115 | done: |
659743b0 | 2116 | spin_unlock(&session->frwd_lock); |
f6d5180c MC |
2117 | } |
2118 | ||
9c19a7d0 | 2119 | static void iscsi_prep_abort_task_pdu(struct iscsi_task *task, |
843c0a8a MC |
2120 | struct iscsi_tm *hdr) |
2121 | { | |
2122 | memset(hdr, 0, sizeof(*hdr)); | |
2123 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
2124 | hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK; | |
2125 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
55bdabdf | 2126 | hdr->lun = task->lun; |
577577da MC |
2127 | hdr->rtt = task->hdr_itt; |
2128 | hdr->refcmdsn = task->cmdsn; | |
843c0a8a MC |
2129 | } |
2130 | ||
7996a778 MC |
2131 | int iscsi_eh_abort(struct scsi_cmnd *sc) |
2132 | { | |
75613521 MC |
2133 | struct iscsi_cls_session *cls_session; |
2134 | struct iscsi_session *session; | |
f47f2cf5 | 2135 | struct iscsi_conn *conn; |
9c19a7d0 | 2136 | struct iscsi_task *task; |
843c0a8a MC |
2137 | struct iscsi_tm *hdr; |
2138 | int rc, age; | |
7996a778 | 2139 | |
75613521 MC |
2140 | cls_session = starget_to_session(scsi_target(sc->device)); |
2141 | session = cls_session->dd_data; | |
2142 | ||
bd2199d4 | 2143 | ISCSI_DBG_EH(session, "aborting sc %p\n", sc); |
4421c9eb | 2144 | |
6724add1 | 2145 | mutex_lock(&session->eh_mutex); |
659743b0 | 2146 | spin_lock_bh(&session->frwd_lock); |
f47f2cf5 MC |
2147 | /* |
2148 | * if session was ISCSI_STATE_IN_RECOVERY then we may not have | |
2149 | * got the command. | |
2150 | */ | |
2151 | if (!sc->SCp.ptr) { | |
bd2199d4 EZ |
2152 | ISCSI_DBG_EH(session, "sc never reached iscsi layer or " |
2153 | "it completed.\n"); | |
659743b0 | 2154 | spin_unlock_bh(&session->frwd_lock); |
6724add1 | 2155 | mutex_unlock(&session->eh_mutex); |
f47f2cf5 MC |
2156 | return SUCCESS; |
2157 | } | |
2158 | ||
7996a778 MC |
2159 | /* |
2160 | * If we are not logged in or we have started a new session | |
2161 | * then let the host reset code handle this | |
2162 | */ | |
843c0a8a MC |
2163 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN || |
2164 | sc->SCp.phase != session->age) { | |
659743b0 | 2165 | spin_unlock_bh(&session->frwd_lock); |
843c0a8a | 2166 | mutex_unlock(&session->eh_mutex); |
bd2199d4 | 2167 | ISCSI_DBG_EH(session, "failing abort due to dropped " |
4421c9eb | 2168 | "session.\n"); |
843c0a8a MC |
2169 | return FAILED; |
2170 | } | |
2171 | ||
2172 | conn = session->leadconn; | |
2173 | conn->eh_abort_cnt++; | |
2174 | age = session->age; | |
2175 | ||
9c19a7d0 | 2176 | task = (struct iscsi_task *)sc->SCp.ptr; |
bd2199d4 EZ |
2177 | ISCSI_DBG_EH(session, "aborting [sc %p itt 0x%x]\n", |
2178 | sc, task->itt); | |
7996a778 | 2179 | |
9c19a7d0 MC |
2180 | /* task completed before time out */ |
2181 | if (!task->sc) { | |
bd2199d4 | 2182 | ISCSI_DBG_EH(session, "sc completed while abort in progress\n"); |
77a23c21 | 2183 | goto success; |
7ea8b828 | 2184 | } |
7996a778 | 2185 | |
9c19a7d0 | 2186 | if (task->state == ISCSI_TASK_PENDING) { |
b3cd5050 | 2187 | fail_scsi_task(task, DID_ABORT); |
77a23c21 MC |
2188 | goto success; |
2189 | } | |
7996a778 | 2190 | |
843c0a8a MC |
2191 | /* only have one tmf outstanding at a time */ |
2192 | if (conn->tmf_state != TMF_INITIAL) | |
7996a778 | 2193 | goto failed; |
843c0a8a | 2194 | conn->tmf_state = TMF_QUEUED; |
7996a778 | 2195 | |
843c0a8a | 2196 | hdr = &conn->tmhdr; |
9c19a7d0 | 2197 | iscsi_prep_abort_task_pdu(task, hdr); |
843c0a8a | 2198 | |
9c19a7d0 | 2199 | if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout)) { |
843c0a8a MC |
2200 | rc = FAILED; |
2201 | goto failed; | |
2202 | } | |
2203 | ||
2204 | switch (conn->tmf_state) { | |
2205 | case TMF_SUCCESS: | |
659743b0 | 2206 | spin_unlock_bh(&session->frwd_lock); |
913e5bf4 MC |
2207 | /* |
2208 | * stop tx side incase the target had sent a abort rsp but | |
2209 | * the initiator was still writing out data. | |
2210 | */ | |
6724add1 | 2211 | iscsi_suspend_tx(conn); |
77a23c21 | 2212 | /* |
913e5bf4 MC |
2213 | * we do not stop the recv side because targets have been |
2214 | * good and have never sent us a successful tmf response | |
2215 | * then sent more data for the cmd. | |
77a23c21 | 2216 | */ |
659743b0 | 2217 | spin_lock_bh(&session->frwd_lock); |
b3cd5050 | 2218 | fail_scsi_task(task, DID_ABORT); |
843c0a8a | 2219 | conn->tmf_state = TMF_INITIAL; |
5d12c05e | 2220 | memset(hdr, 0, sizeof(*hdr)); |
659743b0 | 2221 | spin_unlock_bh(&session->frwd_lock); |
6724add1 | 2222 | iscsi_start_tx(conn); |
77a23c21 | 2223 | goto success_unlocked; |
843c0a8a | 2224 | case TMF_TIMEDOUT: |
659743b0 | 2225 | spin_unlock_bh(&session->frwd_lock); |
df4da5cd | 2226 | iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); |
843c0a8a MC |
2227 | goto failed_unlocked; |
2228 | case TMF_NOT_FOUND: | |
2229 | if (!sc->SCp.ptr) { | |
2230 | conn->tmf_state = TMF_INITIAL; | |
5d12c05e | 2231 | memset(hdr, 0, sizeof(*hdr)); |
9c19a7d0 | 2232 | /* task completed before tmf abort response */ |
bd2199d4 EZ |
2233 | ISCSI_DBG_EH(session, "sc completed while abort in " |
2234 | "progress\n"); | |
77a23c21 | 2235 | goto success; |
7ea8b828 MC |
2236 | } |
2237 | /* fall through */ | |
2238 | default: | |
843c0a8a MC |
2239 | conn->tmf_state = TMF_INITIAL; |
2240 | goto failed; | |
7996a778 MC |
2241 | } |
2242 | ||
77a23c21 | 2243 | success: |
659743b0 | 2244 | spin_unlock_bh(&session->frwd_lock); |
77a23c21 | 2245 | success_unlocked: |
bd2199d4 EZ |
2246 | ISCSI_DBG_EH(session, "abort success [sc %p itt 0x%x]\n", |
2247 | sc, task->itt); | |
6724add1 | 2248 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
2249 | return SUCCESS; |
2250 | ||
2251 | failed: | |
659743b0 | 2252 | spin_unlock_bh(&session->frwd_lock); |
77a23c21 | 2253 | failed_unlocked: |
bd2199d4 EZ |
2254 | ISCSI_DBG_EH(session, "abort failed [sc %p itt 0x%x]\n", sc, |
2255 | task ? task->itt : 0); | |
6724add1 | 2256 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
2257 | return FAILED; |
2258 | } | |
2259 | EXPORT_SYMBOL_GPL(iscsi_eh_abort); | |
2260 | ||
843c0a8a MC |
2261 | static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr) |
2262 | { | |
2263 | memset(hdr, 0, sizeof(*hdr)); | |
2264 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
2265 | hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK; | |
2266 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
55bdabdf | 2267 | int_to_scsilun(sc->device->lun, &hdr->lun); |
f6d5180c | 2268 | hdr->rtt = RESERVED_ITT; |
843c0a8a MC |
2269 | } |
2270 | ||
2271 | int iscsi_eh_device_reset(struct scsi_cmnd *sc) | |
2272 | { | |
75613521 MC |
2273 | struct iscsi_cls_session *cls_session; |
2274 | struct iscsi_session *session; | |
843c0a8a MC |
2275 | struct iscsi_conn *conn; |
2276 | struct iscsi_tm *hdr; | |
2277 | int rc = FAILED; | |
2278 | ||
75613521 MC |
2279 | cls_session = starget_to_session(scsi_target(sc->device)); |
2280 | session = cls_session->dd_data; | |
2281 | ||
bd2199d4 | 2282 | ISCSI_DBG_EH(session, "LU Reset [sc %p lun %u]\n", sc, sc->device->lun); |
843c0a8a MC |
2283 | |
2284 | mutex_lock(&session->eh_mutex); | |
659743b0 | 2285 | spin_lock_bh(&session->frwd_lock); |
843c0a8a MC |
2286 | /* |
2287 | * Just check if we are not logged in. We cannot check for | |
2288 | * the phase because the reset could come from a ioctl. | |
2289 | */ | |
2290 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN) | |
2291 | goto unlock; | |
2292 | conn = session->leadconn; | |
2293 | ||
2294 | /* only have one tmf outstanding at a time */ | |
2295 | if (conn->tmf_state != TMF_INITIAL) | |
2296 | goto unlock; | |
2297 | conn->tmf_state = TMF_QUEUED; | |
2298 | ||
2299 | hdr = &conn->tmhdr; | |
2300 | iscsi_prep_lun_reset_pdu(sc, hdr); | |
2301 | ||
9c19a7d0 | 2302 | if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age, |
f6d5180c | 2303 | session->lu_reset_timeout)) { |
843c0a8a MC |
2304 | rc = FAILED; |
2305 | goto unlock; | |
2306 | } | |
2307 | ||
2308 | switch (conn->tmf_state) { | |
2309 | case TMF_SUCCESS: | |
2310 | break; | |
2311 | case TMF_TIMEDOUT: | |
659743b0 | 2312 | spin_unlock_bh(&session->frwd_lock); |
df4da5cd | 2313 | iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); |
843c0a8a MC |
2314 | goto done; |
2315 | default: | |
2316 | conn->tmf_state = TMF_INITIAL; | |
2317 | goto unlock; | |
2318 | } | |
2319 | ||
2320 | rc = SUCCESS; | |
659743b0 | 2321 | spin_unlock_bh(&session->frwd_lock); |
843c0a8a MC |
2322 | |
2323 | iscsi_suspend_tx(conn); | |
913e5bf4 | 2324 | |
659743b0 | 2325 | spin_lock_bh(&session->frwd_lock); |
5d12c05e | 2326 | memset(hdr, 0, sizeof(*hdr)); |
3bbaaad9 | 2327 | fail_scsi_tasks(conn, sc->device->lun, DID_ERROR); |
843c0a8a | 2328 | conn->tmf_state = TMF_INITIAL; |
659743b0 | 2329 | spin_unlock_bh(&session->frwd_lock); |
843c0a8a MC |
2330 | |
2331 | iscsi_start_tx(conn); | |
2332 | goto done; | |
2333 | ||
2334 | unlock: | |
659743b0 | 2335 | spin_unlock_bh(&session->frwd_lock); |
843c0a8a | 2336 | done: |
bd2199d4 EZ |
2337 | ISCSI_DBG_EH(session, "dev reset result = %s\n", |
2338 | rc == SUCCESS ? "SUCCESS" : "FAILED"); | |
843c0a8a MC |
2339 | mutex_unlock(&session->eh_mutex); |
2340 | return rc; | |
2341 | } | |
2342 | EXPORT_SYMBOL_GPL(iscsi_eh_device_reset); | |
2343 | ||
3fe5ae8b MC |
2344 | void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session) |
2345 | { | |
2346 | struct iscsi_session *session = cls_session->dd_data; | |
2347 | ||
659743b0 | 2348 | spin_lock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2349 | if (session->state != ISCSI_STATE_LOGGED_IN) { |
2350 | session->state = ISCSI_STATE_RECOVERY_FAILED; | |
2351 | if (session->leadconn) | |
2352 | wake_up(&session->leadconn->ehwait); | |
2353 | } | |
659743b0 | 2354 | spin_unlock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2355 | } |
2356 | EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout); | |
2357 | ||
2358 | /** | |
2359 | * iscsi_eh_session_reset - drop session and attempt relogin | |
2360 | * @sc: scsi command | |
2361 | * | |
2362 | * This function will wait for a relogin, session termination from | |
2363 | * userspace, or a recovery/replacement timeout. | |
2364 | */ | |
309ce156 | 2365 | int iscsi_eh_session_reset(struct scsi_cmnd *sc) |
3fe5ae8b MC |
2366 | { |
2367 | struct iscsi_cls_session *cls_session; | |
2368 | struct iscsi_session *session; | |
2369 | struct iscsi_conn *conn; | |
2370 | ||
2371 | cls_session = starget_to_session(scsi_target(sc->device)); | |
2372 | session = cls_session->dd_data; | |
2373 | conn = session->leadconn; | |
2374 | ||
2375 | mutex_lock(&session->eh_mutex); | |
659743b0 | 2376 | spin_lock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2377 | if (session->state == ISCSI_STATE_TERMINATE) { |
2378 | failed: | |
2379 | ISCSI_DBG_EH(session, | |
2380 | "failing session reset: Could not log back into " | |
2381 | "%s, %s [age %d]\n", session->targetname, | |
2382 | conn->persistent_address, session->age); | |
659743b0 | 2383 | spin_unlock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2384 | mutex_unlock(&session->eh_mutex); |
2385 | return FAILED; | |
2386 | } | |
2387 | ||
659743b0 | 2388 | spin_unlock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2389 | mutex_unlock(&session->eh_mutex); |
2390 | /* | |
2391 | * we drop the lock here but the leadconn cannot be destoyed while | |
2392 | * we are in the scsi eh | |
2393 | */ | |
df4da5cd | 2394 | iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); |
3fe5ae8b MC |
2395 | |
2396 | ISCSI_DBG_EH(session, "wait for relogin\n"); | |
2397 | wait_event_interruptible(conn->ehwait, | |
2398 | session->state == ISCSI_STATE_TERMINATE || | |
2399 | session->state == ISCSI_STATE_LOGGED_IN || | |
2400 | session->state == ISCSI_STATE_RECOVERY_FAILED); | |
2401 | if (signal_pending(current)) | |
2402 | flush_signals(current); | |
2403 | ||
2404 | mutex_lock(&session->eh_mutex); | |
659743b0 | 2405 | spin_lock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2406 | if (session->state == ISCSI_STATE_LOGGED_IN) { |
2407 | ISCSI_DBG_EH(session, | |
2408 | "session reset succeeded for %s,%s\n", | |
2409 | session->targetname, conn->persistent_address); | |
2410 | } else | |
2411 | goto failed; | |
659743b0 | 2412 | spin_unlock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2413 | mutex_unlock(&session->eh_mutex); |
2414 | return SUCCESS; | |
2415 | } | |
309ce156 | 2416 | EXPORT_SYMBOL_GPL(iscsi_eh_session_reset); |
3fe5ae8b MC |
2417 | |
2418 | static void iscsi_prep_tgt_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr) | |
2419 | { | |
2420 | memset(hdr, 0, sizeof(*hdr)); | |
2421 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
2422 | hdr->flags = ISCSI_TM_FUNC_TARGET_WARM_RESET & ISCSI_FLAG_TM_FUNC_MASK; | |
2423 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
2424 | hdr->rtt = RESERVED_ITT; | |
2425 | } | |
2426 | ||
2427 | /** | |
2428 | * iscsi_eh_target_reset - reset target | |
2429 | * @sc: scsi command | |
2430 | * | |
309ce156 | 2431 | * This will attempt to send a warm target reset. |
3fe5ae8b MC |
2432 | */ |
2433 | int iscsi_eh_target_reset(struct scsi_cmnd *sc) | |
2434 | { | |
2435 | struct iscsi_cls_session *cls_session; | |
2436 | struct iscsi_session *session; | |
2437 | struct iscsi_conn *conn; | |
2438 | struct iscsi_tm *hdr; | |
2439 | int rc = FAILED; | |
2440 | ||
2441 | cls_session = starget_to_session(scsi_target(sc->device)); | |
2442 | session = cls_session->dd_data; | |
2443 | ||
2444 | ISCSI_DBG_EH(session, "tgt Reset [sc %p tgt %s]\n", sc, | |
2445 | session->targetname); | |
2446 | ||
2447 | mutex_lock(&session->eh_mutex); | |
659743b0 | 2448 | spin_lock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2449 | /* |
2450 | * Just check if we are not logged in. We cannot check for | |
2451 | * the phase because the reset could come from a ioctl. | |
2452 | */ | |
2453 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN) | |
2454 | goto unlock; | |
2455 | conn = session->leadconn; | |
2456 | ||
2457 | /* only have one tmf outstanding at a time */ | |
2458 | if (conn->tmf_state != TMF_INITIAL) | |
2459 | goto unlock; | |
2460 | conn->tmf_state = TMF_QUEUED; | |
2461 | ||
2462 | hdr = &conn->tmhdr; | |
2463 | iscsi_prep_tgt_reset_pdu(sc, hdr); | |
2464 | ||
2465 | if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age, | |
2466 | session->tgt_reset_timeout)) { | |
2467 | rc = FAILED; | |
2468 | goto unlock; | |
2469 | } | |
2470 | ||
2471 | switch (conn->tmf_state) { | |
2472 | case TMF_SUCCESS: | |
2473 | break; | |
2474 | case TMF_TIMEDOUT: | |
659743b0 | 2475 | spin_unlock_bh(&session->frwd_lock); |
df4da5cd | 2476 | iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); |
3fe5ae8b MC |
2477 | goto done; |
2478 | default: | |
2479 | conn->tmf_state = TMF_INITIAL; | |
2480 | goto unlock; | |
2481 | } | |
2482 | ||
2483 | rc = SUCCESS; | |
659743b0 | 2484 | spin_unlock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2485 | |
2486 | iscsi_suspend_tx(conn); | |
2487 | ||
659743b0 | 2488 | spin_lock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2489 | memset(hdr, 0, sizeof(*hdr)); |
2490 | fail_scsi_tasks(conn, -1, DID_ERROR); | |
2491 | conn->tmf_state = TMF_INITIAL; | |
659743b0 | 2492 | spin_unlock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2493 | |
2494 | iscsi_start_tx(conn); | |
2495 | goto done; | |
2496 | ||
2497 | unlock: | |
659743b0 | 2498 | spin_unlock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2499 | done: |
2500 | ISCSI_DBG_EH(session, "tgt %s reset result = %s\n", session->targetname, | |
2501 | rc == SUCCESS ? "SUCCESS" : "FAILED"); | |
2502 | mutex_unlock(&session->eh_mutex); | |
309ce156 JK |
2503 | return rc; |
2504 | } | |
2505 | EXPORT_SYMBOL_GPL(iscsi_eh_target_reset); | |
3fe5ae8b | 2506 | |
309ce156 JK |
2507 | /** |
2508 | * iscsi_eh_recover_target - reset target and possibly the session | |
2509 | * @sc: scsi command | |
2510 | * | |
2511 | * This will attempt to send a warm target reset. If that fails, | |
2512 | * we will escalate to ERL0 session recovery. | |
2513 | */ | |
2514 | int iscsi_eh_recover_target(struct scsi_cmnd *sc) | |
2515 | { | |
2516 | int rc; | |
2517 | ||
2518 | rc = iscsi_eh_target_reset(sc); | |
3fe5ae8b MC |
2519 | if (rc == FAILED) |
2520 | rc = iscsi_eh_session_reset(sc); | |
2521 | return rc; | |
2522 | } | |
309ce156 | 2523 | EXPORT_SYMBOL_GPL(iscsi_eh_recover_target); |
3fe5ae8b | 2524 | |
6320377f OK |
2525 | /* |
2526 | * Pre-allocate a pool of @max items of @item_size. By default, the pool | |
2527 | * should be accessed via kfifo_{get,put} on q->queue. | |
2528 | * Optionally, the caller can obtain the array of object pointers | |
2529 | * by passing in a non-NULL @items pointer | |
2530 | */ | |
7996a778 | 2531 | int |
6320377f | 2532 | iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size) |
7996a778 | 2533 | { |
6320377f | 2534 | int i, num_arrays = 1; |
7996a778 | 2535 | |
6320377f | 2536 | memset(q, 0, sizeof(*q)); |
7996a778 MC |
2537 | |
2538 | q->max = max; | |
6320377f OK |
2539 | |
2540 | /* If the user passed an items pointer, he wants a copy of | |
2541 | * the array. */ | |
2542 | if (items) | |
2543 | num_arrays++; | |
2544 | q->pool = kzalloc(num_arrays * max * sizeof(void*), GFP_KERNEL); | |
2545 | if (q->pool == NULL) | |
f474a37b | 2546 | return -ENOMEM; |
7996a778 | 2547 | |
c1e13f25 | 2548 | kfifo_init(&q->queue, (void*)q->pool, max * sizeof(void*)); |
7996a778 MC |
2549 | |
2550 | for (i = 0; i < max; i++) { | |
6320377f | 2551 | q->pool[i] = kzalloc(item_size, GFP_KERNEL); |
7996a778 | 2552 | if (q->pool[i] == NULL) { |
6320377f OK |
2553 | q->max = i; |
2554 | goto enomem; | |
7996a778 | 2555 | } |
7acd72eb | 2556 | kfifo_in(&q->queue, (void*)&q->pool[i], sizeof(void*)); |
7996a778 | 2557 | } |
6320377f OK |
2558 | |
2559 | if (items) { | |
2560 | *items = q->pool + max; | |
2561 | memcpy(*items, q->pool, max * sizeof(void *)); | |
2562 | } | |
2563 | ||
7996a778 | 2564 | return 0; |
6320377f OK |
2565 | |
2566 | enomem: | |
2567 | iscsi_pool_free(q); | |
2568 | return -ENOMEM; | |
7996a778 MC |
2569 | } |
2570 | EXPORT_SYMBOL_GPL(iscsi_pool_init); | |
2571 | ||
6320377f | 2572 | void iscsi_pool_free(struct iscsi_pool *q) |
7996a778 MC |
2573 | { |
2574 | int i; | |
2575 | ||
2576 | for (i = 0; i < q->max; i++) | |
6320377f | 2577 | kfree(q->pool[i]); |
f474a37b | 2578 | kfree(q->pool); |
7996a778 MC |
2579 | } |
2580 | EXPORT_SYMBOL_GPL(iscsi_pool_free); | |
2581 | ||
a4804cd6 MC |
2582 | /** |
2583 | * iscsi_host_add - add host to system | |
2584 | * @shost: scsi host | |
2585 | * @pdev: parent device | |
2586 | * | |
2587 | * This should be called by partial offload and software iscsi drivers | |
2588 | * to add a host to the system. | |
2589 | */ | |
2590 | int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev) | |
2591 | { | |
8e9a20ce MC |
2592 | if (!shost->can_queue) |
2593 | shost->can_queue = ISCSI_DEF_XMIT_CMDS_MAX; | |
2594 | ||
4d108350 MC |
2595 | if (!shost->cmd_per_lun) |
2596 | shost->cmd_per_lun = ISCSI_DEF_CMD_PER_LUN; | |
2597 | ||
308cec14 MC |
2598 | if (!shost->transportt->eh_timed_out) |
2599 | shost->transportt->eh_timed_out = iscsi_eh_cmd_timed_out; | |
a4804cd6 MC |
2600 | return scsi_add_host(shost, pdev); |
2601 | } | |
2602 | EXPORT_SYMBOL_GPL(iscsi_host_add); | |
2603 | ||
2604 | /** | |
2605 | * iscsi_host_alloc - allocate a host and driver data | |
2606 | * @sht: scsi host template | |
2607 | * @dd_data_size: driver host data size | |
32ae763e | 2608 | * @xmit_can_sleep: bool indicating if LLD will queue IO from a work queue |
a4804cd6 MC |
2609 | * |
2610 | * This should be called by partial offload and software iscsi drivers. | |
2611 | * To access the driver specific memory use the iscsi_host_priv() macro. | |
2612 | */ | |
2613 | struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht, | |
4d108350 | 2614 | int dd_data_size, bool xmit_can_sleep) |
75613521 | 2615 | { |
a4804cd6 | 2616 | struct Scsi_Host *shost; |
e5bd7b54 | 2617 | struct iscsi_host *ihost; |
a4804cd6 MC |
2618 | |
2619 | shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size); | |
2620 | if (!shost) | |
2621 | return NULL; | |
e5bd7b54 | 2622 | ihost = shost_priv(shost); |
32ae763e MC |
2623 | |
2624 | if (xmit_can_sleep) { | |
2625 | snprintf(ihost->workq_name, sizeof(ihost->workq_name), | |
2626 | "iscsi_q_%d", shost->host_no); | |
2627 | ihost->workq = create_singlethread_workqueue(ihost->workq_name); | |
2628 | if (!ihost->workq) | |
2629 | goto free_host; | |
2630 | } | |
2631 | ||
e5bd7b54 MC |
2632 | spin_lock_init(&ihost->lock); |
2633 | ihost->state = ISCSI_HOST_SETUP; | |
2634 | ihost->num_sessions = 0; | |
2635 | init_waitqueue_head(&ihost->session_removal_wq); | |
a4804cd6 | 2636 | return shost; |
32ae763e MC |
2637 | |
2638 | free_host: | |
2639 | scsi_host_put(shost); | |
2640 | return NULL; | |
a4804cd6 MC |
2641 | } |
2642 | EXPORT_SYMBOL_GPL(iscsi_host_alloc); | |
2643 | ||
e5bd7b54 MC |
2644 | static void iscsi_notify_host_removed(struct iscsi_cls_session *cls_session) |
2645 | { | |
40a06e75 | 2646 | iscsi_session_failure(cls_session->dd_data, ISCSI_ERR_INVALID_HOST); |
e5bd7b54 MC |
2647 | } |
2648 | ||
a4804cd6 MC |
2649 | /** |
2650 | * iscsi_host_remove - remove host and sessions | |
2651 | * @shost: scsi host | |
2652 | * | |
e5bd7b54 MC |
2653 | * If there are any sessions left, this will initiate the removal and wait |
2654 | * for the completion. | |
a4804cd6 MC |
2655 | */ |
2656 | void iscsi_host_remove(struct Scsi_Host *shost) | |
2657 | { | |
e5bd7b54 MC |
2658 | struct iscsi_host *ihost = shost_priv(shost); |
2659 | unsigned long flags; | |
2660 | ||
2661 | spin_lock_irqsave(&ihost->lock, flags); | |
2662 | ihost->state = ISCSI_HOST_REMOVED; | |
2663 | spin_unlock_irqrestore(&ihost->lock, flags); | |
2664 | ||
2665 | iscsi_host_for_each_session(shost, iscsi_notify_host_removed); | |
2666 | wait_event_interruptible(ihost->session_removal_wq, | |
2667 | ihost->num_sessions == 0); | |
2668 | if (signal_pending(current)) | |
2669 | flush_signals(current); | |
2670 | ||
a4804cd6 | 2671 | scsi_remove_host(shost); |
32ae763e MC |
2672 | if (ihost->workq) |
2673 | destroy_workqueue(ihost->workq); | |
75613521 | 2674 | } |
a4804cd6 | 2675 | EXPORT_SYMBOL_GPL(iscsi_host_remove); |
7996a778 | 2676 | |
a4804cd6 | 2677 | void iscsi_host_free(struct Scsi_Host *shost) |
75613521 MC |
2678 | { |
2679 | struct iscsi_host *ihost = shost_priv(shost); | |
7996a778 | 2680 | |
75613521 MC |
2681 | kfree(ihost->netdev); |
2682 | kfree(ihost->hwaddress); | |
2683 | kfree(ihost->initiatorname); | |
a4804cd6 | 2684 | scsi_host_put(shost); |
75613521 | 2685 | } |
a4804cd6 | 2686 | EXPORT_SYMBOL_GPL(iscsi_host_free); |
7996a778 | 2687 | |
e5bd7b54 MC |
2688 | static void iscsi_host_dec_session_cnt(struct Scsi_Host *shost) |
2689 | { | |
2690 | struct iscsi_host *ihost = shost_priv(shost); | |
2691 | unsigned long flags; | |
2692 | ||
2693 | shost = scsi_host_get(shost); | |
2694 | if (!shost) { | |
2695 | printk(KERN_ERR "Invalid state. Cannot notify host removal " | |
2696 | "of session teardown event because host already " | |
2697 | "removed.\n"); | |
2698 | return; | |
2699 | } | |
2700 | ||
2701 | spin_lock_irqsave(&ihost->lock, flags); | |
2702 | ihost->num_sessions--; | |
2703 | if (ihost->num_sessions == 0) | |
2704 | wake_up(&ihost->session_removal_wq); | |
2705 | spin_unlock_irqrestore(&ihost->lock, flags); | |
2706 | scsi_host_put(shost); | |
2707 | } | |
2708 | ||
7996a778 MC |
2709 | /** |
2710 | * iscsi_session_setup - create iscsi cls session and host and session | |
7996a778 | 2711 | * @iscsit: iscsi transport template |
75613521 MC |
2712 | * @shost: scsi host |
2713 | * @cmds_max: session can queue | |
9c19a7d0 | 2714 | * @cmd_task_size: LLD task private data size |
7996a778 | 2715 | * @initial_cmdsn: initial CmdSN |
7996a778 MC |
2716 | * |
2717 | * This can be used by software iscsi_transports that allocate | |
2718 | * a session per scsi host. | |
3cf7b233 MC |
2719 | * |
2720 | * Callers should set cmds_max to the largest total numer (mgmt + scsi) of | |
2721 | * tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks | |
2722 | * for nop handling and login/logout requests. | |
75613521 | 2723 | */ |
7996a778 | 2724 | struct iscsi_cls_session * |
75613521 | 2725 | iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost, |
b8b9e1b8 | 2726 | uint16_t cmds_max, int dd_size, int cmd_task_size, |
7970634b | 2727 | uint32_t initial_cmdsn, unsigned int id) |
7996a778 | 2728 | { |
e5bd7b54 | 2729 | struct iscsi_host *ihost = shost_priv(shost); |
7996a778 MC |
2730 | struct iscsi_session *session; |
2731 | struct iscsi_cls_session *cls_session; | |
3cf7b233 | 2732 | int cmd_i, scsi_cmds, total_cmds = cmds_max; |
e5bd7b54 MC |
2733 | unsigned long flags; |
2734 | ||
2735 | spin_lock_irqsave(&ihost->lock, flags); | |
2736 | if (ihost->state == ISCSI_HOST_REMOVED) { | |
2737 | spin_unlock_irqrestore(&ihost->lock, flags); | |
2738 | return NULL; | |
2739 | } | |
2740 | ihost->num_sessions++; | |
2741 | spin_unlock_irqrestore(&ihost->lock, flags); | |
8e9a20ce MC |
2742 | |
2743 | if (!total_cmds) | |
2744 | total_cmds = ISCSI_DEF_XMIT_CMDS_MAX; | |
3e5c28ad | 2745 | /* |
3cf7b233 MC |
2746 | * The iscsi layer needs some tasks for nop handling and tmfs, |
2747 | * so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX | |
2748 | * + 1 command for scsi IO. | |
3e5c28ad | 2749 | */ |
3cf7b233 MC |
2750 | if (total_cmds < ISCSI_TOTAL_CMDS_MIN) { |
2751 | printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " | |
2752 | "must be a power of two that is at least %d.\n", | |
2753 | total_cmds, ISCSI_TOTAL_CMDS_MIN); | |
e5bd7b54 | 2754 | goto dec_session_count; |
3cf7b233 MC |
2755 | } |
2756 | ||
2757 | if (total_cmds > ISCSI_TOTAL_CMDS_MAX) { | |
2758 | printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " | |
2759 | "must be a power of 2 less than or equal to %d.\n", | |
2760 | cmds_max, ISCSI_TOTAL_CMDS_MAX); | |
2761 | total_cmds = ISCSI_TOTAL_CMDS_MAX; | |
2762 | } | |
2763 | ||
2764 | if (!is_power_of_2(total_cmds)) { | |
2765 | printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " | |
2766 | "must be a power of 2.\n", total_cmds); | |
2767 | total_cmds = rounddown_pow_of_two(total_cmds); | |
2768 | if (total_cmds < ISCSI_TOTAL_CMDS_MIN) | |
2769 | return NULL; | |
2770 | printk(KERN_INFO "iscsi: Rounding can_queue to %d.\n", | |
2771 | total_cmds); | |
1548271e | 2772 | } |
3cf7b233 | 2773 | scsi_cmds = total_cmds - ISCSI_MGMT_CMDS_MAX; |
1548271e | 2774 | |
5d91e209 | 2775 | cls_session = iscsi_alloc_session(shost, iscsit, |
b8b9e1b8 JK |
2776 | sizeof(struct iscsi_session) + |
2777 | dd_size); | |
75613521 | 2778 | if (!cls_session) |
e5bd7b54 | 2779 | goto dec_session_count; |
75613521 MC |
2780 | session = cls_session->dd_data; |
2781 | session->cls_session = cls_session; | |
7996a778 MC |
2782 | session->host = shost; |
2783 | session->state = ISCSI_STATE_FREE; | |
f6d5180c | 2784 | session->fast_abort = 1; |
3fe5ae8b | 2785 | session->tgt_reset_timeout = 30; |
4cd49ea1 MC |
2786 | session->lu_reset_timeout = 15; |
2787 | session->abort_timeout = 10; | |
3cf7b233 MC |
2788 | session->scsi_cmds_max = scsi_cmds; |
2789 | session->cmds_max = total_cmds; | |
e0726407 | 2790 | session->queued_cmdsn = session->cmdsn = initial_cmdsn; |
7996a778 MC |
2791 | session->exp_cmdsn = initial_cmdsn + 1; |
2792 | session->max_cmdsn = initial_cmdsn + 1; | |
2793 | session->max_r2t = 1; | |
2794 | session->tt = iscsit; | |
b8b9e1b8 | 2795 | session->dd_data = cls_session->dd_data + sizeof(*session); |
659743b0 | 2796 | |
6724add1 | 2797 | mutex_init(&session->eh_mutex); |
659743b0 SP |
2798 | spin_lock_init(&session->frwd_lock); |
2799 | spin_lock_init(&session->back_lock); | |
7996a778 MC |
2800 | |
2801 | /* initialize SCSI PDU commands pool */ | |
2802 | if (iscsi_pool_init(&session->cmdpool, session->cmds_max, | |
2803 | (void***)&session->cmds, | |
9c19a7d0 | 2804 | cmd_task_size + sizeof(struct iscsi_task))) |
7996a778 MC |
2805 | goto cmdpool_alloc_fail; |
2806 | ||
2807 | /* pre-format cmds pool with ITT */ | |
2808 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
9c19a7d0 | 2809 | struct iscsi_task *task = session->cmds[cmd_i]; |
7996a778 | 2810 | |
9c19a7d0 MC |
2811 | if (cmd_task_size) |
2812 | task->dd_data = &task[1]; | |
2813 | task->itt = cmd_i; | |
3bbaaad9 | 2814 | task->state = ISCSI_TASK_FREE; |
9c19a7d0 | 2815 | INIT_LIST_HEAD(&task->running); |
7996a778 MC |
2816 | } |
2817 | ||
f53a88da | 2818 | if (!try_module_get(iscsit->owner)) |
75613521 | 2819 | goto module_get_fail; |
7996a778 | 2820 | |
7970634b | 2821 | if (iscsi_add_session(cls_session, id)) |
75613521 | 2822 | goto cls_session_fail; |
e5bd7b54 | 2823 | |
7996a778 MC |
2824 | return cls_session; |
2825 | ||
2826 | cls_session_fail: | |
75613521 MC |
2827 | module_put(iscsit->owner); |
2828 | module_get_fail: | |
6320377f | 2829 | iscsi_pool_free(&session->cmdpool); |
7996a778 | 2830 | cmdpool_alloc_fail: |
75613521 | 2831 | iscsi_free_session(cls_session); |
e5bd7b54 MC |
2832 | dec_session_count: |
2833 | iscsi_host_dec_session_cnt(shost); | |
7996a778 MC |
2834 | return NULL; |
2835 | } | |
2836 | EXPORT_SYMBOL_GPL(iscsi_session_setup); | |
2837 | ||
2838 | /** | |
2839 | * iscsi_session_teardown - destroy session, host, and cls_session | |
75613521 | 2840 | * @cls_session: iscsi session |
7996a778 | 2841 | * |
75613521 MC |
2842 | * The driver must have called iscsi_remove_session before |
2843 | * calling this. | |
2844 | */ | |
7996a778 MC |
2845 | void iscsi_session_teardown(struct iscsi_cls_session *cls_session) |
2846 | { | |
75613521 | 2847 | struct iscsi_session *session = cls_session->dd_data; |
63f75cc8 | 2848 | struct module *owner = cls_session->transport->owner; |
e5bd7b54 | 2849 | struct Scsi_Host *shost = session->host; |
7996a778 | 2850 | |
6320377f | 2851 | iscsi_pool_free(&session->cmdpool); |
7996a778 | 2852 | |
b2c64167 MC |
2853 | kfree(session->password); |
2854 | kfree(session->password_in); | |
2855 | kfree(session->username); | |
2856 | kfree(session->username_in); | |
f3ff0c36 | 2857 | kfree(session->targetname); |
3c5c4801 | 2858 | kfree(session->targetalias); |
88dfd340 | 2859 | kfree(session->initiatorname); |
3b9373e9 EW |
2860 | kfree(session->boot_root); |
2861 | kfree(session->boot_nic); | |
2862 | kfree(session->boot_target); | |
88dfd340 | 2863 | kfree(session->ifacename); |
f8525eb4 AC |
2864 | kfree(session->portal_type); |
2865 | kfree(session->discovery_parent_type); | |
f3ff0c36 | 2866 | |
75613521 | 2867 | iscsi_destroy_session(cls_session); |
e5bd7b54 | 2868 | iscsi_host_dec_session_cnt(shost); |
63f75cc8 | 2869 | module_put(owner); |
7996a778 MC |
2870 | } |
2871 | EXPORT_SYMBOL_GPL(iscsi_session_teardown); | |
2872 | ||
2873 | /** | |
2874 | * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn | |
2875 | * @cls_session: iscsi_cls_session | |
5d91e209 | 2876 | * @dd_size: private driver data size |
7996a778 | 2877 | * @conn_idx: cid |
5d91e209 | 2878 | */ |
7996a778 | 2879 | struct iscsi_cls_conn * |
5d91e209 MC |
2880 | iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size, |
2881 | uint32_t conn_idx) | |
7996a778 | 2882 | { |
75613521 | 2883 | struct iscsi_session *session = cls_session->dd_data; |
7996a778 MC |
2884 | struct iscsi_conn *conn; |
2885 | struct iscsi_cls_conn *cls_conn; | |
d36ab6f3 | 2886 | char *data; |
7996a778 | 2887 | |
5d91e209 MC |
2888 | cls_conn = iscsi_create_conn(cls_session, sizeof(*conn) + dd_size, |
2889 | conn_idx); | |
7996a778 MC |
2890 | if (!cls_conn) |
2891 | return NULL; | |
2892 | conn = cls_conn->dd_data; | |
5d91e209 | 2893 | memset(conn, 0, sizeof(*conn) + dd_size); |
7996a778 | 2894 | |
5d91e209 | 2895 | conn->dd_data = cls_conn->dd_data + sizeof(*conn); |
7996a778 MC |
2896 | conn->session = session; |
2897 | conn->cls_conn = cls_conn; | |
2898 | conn->c_stage = ISCSI_CONN_INITIAL_STAGE; | |
2899 | conn->id = conn_idx; | |
2900 | conn->exp_statsn = 0; | |
843c0a8a | 2901 | conn->tmf_state = TMF_INITIAL; |
f6d5180c MC |
2902 | |
2903 | init_timer(&conn->transport_timer); | |
2904 | conn->transport_timer.data = (unsigned long)conn; | |
2905 | conn->transport_timer.function = iscsi_check_transport_timeouts; | |
2906 | ||
843c0a8a | 2907 | INIT_LIST_HEAD(&conn->mgmtqueue); |
3bbaaad9 | 2908 | INIT_LIST_HEAD(&conn->cmdqueue); |
843c0a8a | 2909 | INIT_LIST_HEAD(&conn->requeue); |
c4028958 | 2910 | INIT_WORK(&conn->xmitwork, iscsi_xmitworker); |
7996a778 | 2911 | |
9c19a7d0 | 2912 | /* allocate login_task used for the login/text sequences */ |
659743b0 | 2913 | spin_lock_bh(&session->frwd_lock); |
7acd72eb | 2914 | if (!kfifo_out(&session->cmdpool.queue, |
9c19a7d0 | 2915 | (void*)&conn->login_task, |
7996a778 | 2916 | sizeof(void*))) { |
659743b0 | 2917 | spin_unlock_bh(&session->frwd_lock); |
9c19a7d0 | 2918 | goto login_task_alloc_fail; |
7996a778 | 2919 | } |
659743b0 | 2920 | spin_unlock_bh(&session->frwd_lock); |
7996a778 | 2921 | |
cfeb2cf9 MC |
2922 | data = (char *) __get_free_pages(GFP_KERNEL, |
2923 | get_order(ISCSI_DEF_MAX_RECV_SEG_LEN)); | |
d36ab6f3 | 2924 | if (!data) |
9c19a7d0 MC |
2925 | goto login_task_data_alloc_fail; |
2926 | conn->login_task->data = conn->data = data; | |
d36ab6f3 | 2927 | |
843c0a8a | 2928 | init_timer(&conn->tmf_timer); |
7996a778 MC |
2929 | init_waitqueue_head(&conn->ehwait); |
2930 | ||
2931 | return cls_conn; | |
2932 | ||
9c19a7d0 | 2933 | login_task_data_alloc_fail: |
7acd72eb | 2934 | kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task, |
d36ab6f3 | 2935 | sizeof(void*)); |
9c19a7d0 | 2936 | login_task_alloc_fail: |
7996a778 MC |
2937 | iscsi_destroy_conn(cls_conn); |
2938 | return NULL; | |
2939 | } | |
2940 | EXPORT_SYMBOL_GPL(iscsi_conn_setup); | |
2941 | ||
2942 | /** | |
2943 | * iscsi_conn_teardown - teardown iscsi connection | |
2944 | * cls_conn: iscsi class connection | |
2945 | * | |
2946 | * TODO: we may need to make this into a two step process | |
2947 | * like scsi-mls remove + put host | |
2948 | */ | |
2949 | void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn) | |
2950 | { | |
2951 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2952 | struct iscsi_session *session = conn->session; | |
2953 | unsigned long flags; | |
2954 | ||
f6d5180c MC |
2955 | del_timer_sync(&conn->transport_timer); |
2956 | ||
659743b0 | 2957 | spin_lock_bh(&session->frwd_lock); |
7996a778 MC |
2958 | conn->c_stage = ISCSI_CONN_CLEANUP_WAIT; |
2959 | if (session->leadconn == conn) { | |
2960 | /* | |
2961 | * leading connection? then give up on recovery. | |
2962 | */ | |
2963 | session->state = ISCSI_STATE_TERMINATE; | |
2964 | wake_up(&conn->ehwait); | |
2965 | } | |
659743b0 | 2966 | spin_unlock_bh(&session->frwd_lock); |
7996a778 | 2967 | |
7996a778 MC |
2968 | /* |
2969 | * Block until all in-progress commands for this connection | |
2970 | * time out or fail. | |
2971 | */ | |
2972 | for (;;) { | |
2973 | spin_lock_irqsave(session->host->host_lock, flags); | |
2974 | if (!session->host->host_busy) { /* OK for ERL == 0 */ | |
2975 | spin_unlock_irqrestore(session->host->host_lock, flags); | |
2976 | break; | |
2977 | } | |
2978 | spin_unlock_irqrestore(session->host->host_lock, flags); | |
2979 | msleep_interruptible(500); | |
322d739d MC |
2980 | iscsi_conn_printk(KERN_INFO, conn, "iscsi conn_destroy(): " |
2981 | "host_busy %d host_failed %d\n", | |
2982 | session->host->host_busy, | |
2983 | session->host->host_failed); | |
7996a778 MC |
2984 | /* |
2985 | * force eh_abort() to unblock | |
2986 | */ | |
2987 | wake_up(&conn->ehwait); | |
2988 | } | |
2989 | ||
779ea120 | 2990 | /* flush queued up work because we free the connection below */ |
843c0a8a | 2991 | iscsi_suspend_tx(conn); |
779ea120 | 2992 | |
659743b0 | 2993 | spin_lock_bh(&session->frwd_lock); |
cfeb2cf9 MC |
2994 | free_pages((unsigned long) conn->data, |
2995 | get_order(ISCSI_DEF_MAX_RECV_SEG_LEN)); | |
f3ff0c36 | 2996 | kfree(conn->persistent_address); |
ae56ff40 | 2997 | kfree(conn->local_ipaddr); |
659743b0 SP |
2998 | /* regular RX path uses back_lock */ |
2999 | spin_lock_bh(&session->back_lock); | |
7acd72eb | 3000 | kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task, |
7996a778 | 3001 | sizeof(void*)); |
659743b0 | 3002 | spin_unlock_bh(&session->back_lock); |
e0726407 | 3003 | if (session->leadconn == conn) |
7996a778 | 3004 | session->leadconn = NULL; |
659743b0 | 3005 | spin_unlock_bh(&session->frwd_lock); |
7996a778 | 3006 | |
7996a778 MC |
3007 | iscsi_destroy_conn(cls_conn); |
3008 | } | |
3009 | EXPORT_SYMBOL_GPL(iscsi_conn_teardown); | |
3010 | ||
3011 | int iscsi_conn_start(struct iscsi_cls_conn *cls_conn) | |
3012 | { | |
3013 | struct iscsi_conn *conn = cls_conn->dd_data; | |
3014 | struct iscsi_session *session = conn->session; | |
3015 | ||
ffd0436e | 3016 | if (!session) { |
322d739d MC |
3017 | iscsi_conn_printk(KERN_ERR, conn, |
3018 | "can't start unbound connection\n"); | |
7996a778 MC |
3019 | return -EPERM; |
3020 | } | |
3021 | ||
db98ccde MC |
3022 | if ((session->imm_data_en || !session->initial_r2t_en) && |
3023 | session->first_burst > session->max_burst) { | |
322d739d MC |
3024 | iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: " |
3025 | "first_burst %d max_burst %d\n", | |
3026 | session->first_burst, session->max_burst); | |
ffd0436e MC |
3027 | return -EINVAL; |
3028 | } | |
3029 | ||
f6d5180c | 3030 | if (conn->ping_timeout && !conn->recv_timeout) { |
322d739d MC |
3031 | iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of " |
3032 | "zero. Using 5 seconds\n."); | |
f6d5180c MC |
3033 | conn->recv_timeout = 5; |
3034 | } | |
3035 | ||
3036 | if (conn->recv_timeout && !conn->ping_timeout) { | |
322d739d MC |
3037 | iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of " |
3038 | "zero. Using 5 seconds.\n"); | |
f6d5180c MC |
3039 | conn->ping_timeout = 5; |
3040 | } | |
3041 | ||
659743b0 | 3042 | spin_lock_bh(&session->frwd_lock); |
7996a778 MC |
3043 | conn->c_stage = ISCSI_CONN_STARTED; |
3044 | session->state = ISCSI_STATE_LOGGED_IN; | |
e0726407 | 3045 | session->queued_cmdsn = session->cmdsn; |
7996a778 | 3046 | |
f6d5180c MC |
3047 | conn->last_recv = jiffies; |
3048 | conn->last_ping = jiffies; | |
3049 | if (conn->recv_timeout && conn->ping_timeout) | |
3050 | mod_timer(&conn->transport_timer, | |
3051 | jiffies + (conn->recv_timeout * HZ)); | |
3052 | ||
7996a778 MC |
3053 | switch(conn->stop_stage) { |
3054 | case STOP_CONN_RECOVER: | |
3055 | /* | |
3056 | * unblock eh_abort() if it is blocked. re-try all | |
3057 | * commands after successful recovery | |
3058 | */ | |
7996a778 | 3059 | conn->stop_stage = 0; |
843c0a8a | 3060 | conn->tmf_state = TMF_INITIAL; |
7996a778 | 3061 | session->age++; |
8b1d0343 MC |
3062 | if (session->age == 16) |
3063 | session->age = 0; | |
6eabafbe | 3064 | break; |
7996a778 | 3065 | case STOP_CONN_TERM: |
7996a778 | 3066 | conn->stop_stage = 0; |
7996a778 MC |
3067 | break; |
3068 | default: | |
3069 | break; | |
3070 | } | |
659743b0 | 3071 | spin_unlock_bh(&session->frwd_lock); |
7996a778 | 3072 | |
75613521 | 3073 | iscsi_unblock_session(session->cls_session); |
6eabafbe | 3074 | wake_up(&conn->ehwait); |
7996a778 MC |
3075 | return 0; |
3076 | } | |
3077 | EXPORT_SYMBOL_GPL(iscsi_conn_start); | |
3078 | ||
3079 | static void | |
3bbaaad9 | 3080 | fail_mgmt_tasks(struct iscsi_session *session, struct iscsi_conn *conn) |
7996a778 | 3081 | { |
3bbaaad9 | 3082 | struct iscsi_task *task; |
b3cd5050 | 3083 | int i, state; |
7996a778 | 3084 | |
3bbaaad9 MC |
3085 | for (i = 0; i < conn->session->cmds_max; i++) { |
3086 | task = conn->session->cmds[i]; | |
3087 | if (task->sc) | |
3088 | continue; | |
7996a778 | 3089 | |
3bbaaad9 MC |
3090 | if (task->state == ISCSI_TASK_FREE) |
3091 | continue; | |
7996a778 | 3092 | |
3bbaaad9 MC |
3093 | ISCSI_DBG_SESSION(conn->session, |
3094 | "failing mgmt itt 0x%x state %d\n", | |
3095 | task->itt, task->state); | |
b3cd5050 MC |
3096 | state = ISCSI_TASK_ABRT_SESS_RECOV; |
3097 | if (task->state == ISCSI_TASK_PENDING) | |
3098 | state = ISCSI_TASK_COMPLETED; | |
3099 | iscsi_complete_task(task, state); | |
3100 | ||
3bbaaad9 | 3101 | } |
7996a778 MC |
3102 | } |
3103 | ||
656cffc9 MC |
3104 | static void iscsi_start_session_recovery(struct iscsi_session *session, |
3105 | struct iscsi_conn *conn, int flag) | |
7996a778 | 3106 | { |
ed2abc7f MC |
3107 | int old_stop_stage; |
3108 | ||
6724add1 | 3109 | mutex_lock(&session->eh_mutex); |
659743b0 | 3110 | spin_lock_bh(&session->frwd_lock); |
ed2abc7f | 3111 | if (conn->stop_stage == STOP_CONN_TERM) { |
659743b0 | 3112 | spin_unlock_bh(&session->frwd_lock); |
6724add1 MC |
3113 | mutex_unlock(&session->eh_mutex); |
3114 | return; | |
3115 | } | |
3116 | ||
ed2abc7f MC |
3117 | /* |
3118 | * When this is called for the in_login state, we only want to clean | |
9c19a7d0 | 3119 | * up the login task and connection. We do not need to block and set |
67a61114 | 3120 | * the recovery state again |
ed2abc7f | 3121 | */ |
67a61114 MC |
3122 | if (flag == STOP_CONN_TERM) |
3123 | session->state = ISCSI_STATE_TERMINATE; | |
3124 | else if (conn->stop_stage != STOP_CONN_RECOVER) | |
3125 | session->state = ISCSI_STATE_IN_RECOVERY; | |
4ae0a6c1 MC |
3126 | |
3127 | old_stop_stage = conn->stop_stage; | |
3128 | conn->stop_stage = flag; | |
659743b0 | 3129 | spin_unlock_bh(&session->frwd_lock); |
ed2abc7f | 3130 | |
26013ad4 MC |
3131 | del_timer_sync(&conn->transport_timer); |
3132 | iscsi_suspend_tx(conn); | |
3133 | ||
659743b0 | 3134 | spin_lock_bh(&session->frwd_lock); |
67a61114 | 3135 | conn->c_stage = ISCSI_CONN_STOPPED; |
659743b0 | 3136 | spin_unlock_bh(&session->frwd_lock); |
6724add1 | 3137 | |
7996a778 MC |
3138 | /* |
3139 | * for connection level recovery we should not calculate | |
3140 | * header digest. conn->hdr_size used for optimization | |
3141 | * in hdr_extract() and will be re-negotiated at | |
3142 | * set_param() time. | |
3143 | */ | |
3144 | if (flag == STOP_CONN_RECOVER) { | |
3145 | conn->hdrdgst_en = 0; | |
3146 | conn->datadgst_en = 0; | |
656cffc9 | 3147 | if (session->state == ISCSI_STATE_IN_RECOVERY && |
67a61114 | 3148 | old_stop_stage != STOP_CONN_RECOVER) { |
1b2c7af8 | 3149 | ISCSI_DBG_SESSION(session, "blocking session\n"); |
75613521 | 3150 | iscsi_block_session(session->cls_session); |
67a61114 | 3151 | } |
7996a778 | 3152 | } |
656cffc9 | 3153 | |
656cffc9 MC |
3154 | /* |
3155 | * flush queues. | |
3156 | */ | |
659743b0 | 3157 | spin_lock_bh(&session->frwd_lock); |
b3cd5050 | 3158 | fail_scsi_tasks(conn, -1, DID_TRANSPORT_DISRUPTED); |
3bbaaad9 | 3159 | fail_mgmt_tasks(session, conn); |
5d12c05e | 3160 | memset(&conn->tmhdr, 0, sizeof(conn->tmhdr)); |
659743b0 | 3161 | spin_unlock_bh(&session->frwd_lock); |
6724add1 | 3162 | mutex_unlock(&session->eh_mutex); |
7996a778 | 3163 | } |
7996a778 MC |
3164 | |
3165 | void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) | |
3166 | { | |
3167 | struct iscsi_conn *conn = cls_conn->dd_data; | |
3168 | struct iscsi_session *session = conn->session; | |
3169 | ||
3170 | switch (flag) { | |
3171 | case STOP_CONN_RECOVER: | |
3172 | case STOP_CONN_TERM: | |
3173 | iscsi_start_session_recovery(session, conn, flag); | |
8d2860b3 | 3174 | break; |
7996a778 | 3175 | default: |
322d739d MC |
3176 | iscsi_conn_printk(KERN_ERR, conn, |
3177 | "invalid stop flag %d\n", flag); | |
7996a778 MC |
3178 | } |
3179 | } | |
3180 | EXPORT_SYMBOL_GPL(iscsi_conn_stop); | |
3181 | ||
3182 | int iscsi_conn_bind(struct iscsi_cls_session *cls_session, | |
3183 | struct iscsi_cls_conn *cls_conn, int is_leading) | |
3184 | { | |
75613521 | 3185 | struct iscsi_session *session = cls_session->dd_data; |
98644047 | 3186 | struct iscsi_conn *conn = cls_conn->dd_data; |
7996a778 | 3187 | |
659743b0 | 3188 | spin_lock_bh(&session->frwd_lock); |
7996a778 MC |
3189 | if (is_leading) |
3190 | session->leadconn = conn; | |
659743b0 | 3191 | spin_unlock_bh(&session->frwd_lock); |
7996a778 MC |
3192 | |
3193 | /* | |
3194 | * Unblock xmitworker(), Login Phase will pass through. | |
3195 | */ | |
3196 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
3197 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
3198 | return 0; | |
3199 | } | |
3200 | EXPORT_SYMBOL_GPL(iscsi_conn_bind); | |
3201 | ||
adaf6990 | 3202 | int iscsi_switch_str_param(char **param, char *new_val_buf) |
5700b1af MC |
3203 | { |
3204 | char *new_val; | |
3205 | ||
3206 | if (*param) { | |
3207 | if (!strcmp(*param, new_val_buf)) | |
3208 | return 0; | |
3209 | } | |
3210 | ||
3211 | new_val = kstrdup(new_val_buf, GFP_NOIO); | |
3212 | if (!new_val) | |
3213 | return -ENOMEM; | |
3214 | ||
3215 | kfree(*param); | |
3216 | *param = new_val; | |
3217 | return 0; | |
3218 | } | |
adaf6990 | 3219 | EXPORT_SYMBOL_GPL(iscsi_switch_str_param); |
a54a52ca MC |
3220 | |
3221 | int iscsi_set_param(struct iscsi_cls_conn *cls_conn, | |
3222 | enum iscsi_param param, char *buf, int buflen) | |
3223 | { | |
3224 | struct iscsi_conn *conn = cls_conn->dd_data; | |
3225 | struct iscsi_session *session = conn->session; | |
6a06a4b8 | 3226 | int val; |
a54a52ca MC |
3227 | |
3228 | switch(param) { | |
843c0a8a MC |
3229 | case ISCSI_PARAM_FAST_ABORT: |
3230 | sscanf(buf, "%d", &session->fast_abort); | |
3231 | break; | |
f6d5180c MC |
3232 | case ISCSI_PARAM_ABORT_TMO: |
3233 | sscanf(buf, "%d", &session->abort_timeout); | |
3234 | break; | |
3235 | case ISCSI_PARAM_LU_RESET_TMO: | |
3236 | sscanf(buf, "%d", &session->lu_reset_timeout); | |
3237 | break; | |
3fe5ae8b MC |
3238 | case ISCSI_PARAM_TGT_RESET_TMO: |
3239 | sscanf(buf, "%d", &session->tgt_reset_timeout); | |
3240 | break; | |
f6d5180c MC |
3241 | case ISCSI_PARAM_PING_TMO: |
3242 | sscanf(buf, "%d", &conn->ping_timeout); | |
3243 | break; | |
3244 | case ISCSI_PARAM_RECV_TMO: | |
3245 | sscanf(buf, "%d", &conn->recv_timeout); | |
3246 | break; | |
a54a52ca MC |
3247 | case ISCSI_PARAM_MAX_RECV_DLENGTH: |
3248 | sscanf(buf, "%d", &conn->max_recv_dlength); | |
3249 | break; | |
3250 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
3251 | sscanf(buf, "%d", &conn->max_xmit_dlength); | |
3252 | break; | |
3253 | case ISCSI_PARAM_HDRDGST_EN: | |
3254 | sscanf(buf, "%d", &conn->hdrdgst_en); | |
3255 | break; | |
3256 | case ISCSI_PARAM_DATADGST_EN: | |
3257 | sscanf(buf, "%d", &conn->datadgst_en); | |
3258 | break; | |
3259 | case ISCSI_PARAM_INITIAL_R2T_EN: | |
3260 | sscanf(buf, "%d", &session->initial_r2t_en); | |
3261 | break; | |
3262 | case ISCSI_PARAM_MAX_R2T: | |
1304be5f | 3263 | sscanf(buf, "%hu", &session->max_r2t); |
a54a52ca MC |
3264 | break; |
3265 | case ISCSI_PARAM_IMM_DATA_EN: | |
3266 | sscanf(buf, "%d", &session->imm_data_en); | |
3267 | break; | |
3268 | case ISCSI_PARAM_FIRST_BURST: | |
3269 | sscanf(buf, "%d", &session->first_burst); | |
3270 | break; | |
3271 | case ISCSI_PARAM_MAX_BURST: | |
3272 | sscanf(buf, "%d", &session->max_burst); | |
3273 | break; | |
3274 | case ISCSI_PARAM_PDU_INORDER_EN: | |
3275 | sscanf(buf, "%d", &session->pdu_inorder_en); | |
3276 | break; | |
3277 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
3278 | sscanf(buf, "%d", &session->dataseq_inorder_en); | |
3279 | break; | |
3280 | case ISCSI_PARAM_ERL: | |
3281 | sscanf(buf, "%d", &session->erl); | |
3282 | break; | |
a54a52ca MC |
3283 | case ISCSI_PARAM_EXP_STATSN: |
3284 | sscanf(buf, "%u", &conn->exp_statsn); | |
3285 | break; | |
b2c64167 | 3286 | case ISCSI_PARAM_USERNAME: |
5700b1af | 3287 | return iscsi_switch_str_param(&session->username, buf); |
b2c64167 | 3288 | case ISCSI_PARAM_USERNAME_IN: |
5700b1af | 3289 | return iscsi_switch_str_param(&session->username_in, buf); |
b2c64167 | 3290 | case ISCSI_PARAM_PASSWORD: |
5700b1af | 3291 | return iscsi_switch_str_param(&session->password, buf); |
b2c64167 | 3292 | case ISCSI_PARAM_PASSWORD_IN: |
5700b1af | 3293 | return iscsi_switch_str_param(&session->password_in, buf); |
a54a52ca | 3294 | case ISCSI_PARAM_TARGET_NAME: |
5700b1af | 3295 | return iscsi_switch_str_param(&session->targetname, buf); |
3c5c4801 VC |
3296 | case ISCSI_PARAM_TARGET_ALIAS: |
3297 | return iscsi_switch_str_param(&session->targetalias, buf); | |
a54a52ca MC |
3298 | case ISCSI_PARAM_TPGT: |
3299 | sscanf(buf, "%d", &session->tpgt); | |
3300 | break; | |
3301 | case ISCSI_PARAM_PERSISTENT_PORT: | |
3302 | sscanf(buf, "%d", &conn->persistent_port); | |
3303 | break; | |
3304 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
5700b1af | 3305 | return iscsi_switch_str_param(&conn->persistent_address, buf); |
88dfd340 | 3306 | case ISCSI_PARAM_IFACE_NAME: |
5700b1af | 3307 | return iscsi_switch_str_param(&session->ifacename, buf); |
88dfd340 | 3308 | case ISCSI_PARAM_INITIATOR_NAME: |
5700b1af | 3309 | return iscsi_switch_str_param(&session->initiatorname, buf); |
3b9373e9 EW |
3310 | case ISCSI_PARAM_BOOT_ROOT: |
3311 | return iscsi_switch_str_param(&session->boot_root, buf); | |
3312 | case ISCSI_PARAM_BOOT_NIC: | |
3313 | return iscsi_switch_str_param(&session->boot_nic, buf); | |
3314 | case ISCSI_PARAM_BOOT_TARGET: | |
3315 | return iscsi_switch_str_param(&session->boot_target, buf); | |
f8525eb4 AC |
3316 | case ISCSI_PARAM_PORTAL_TYPE: |
3317 | return iscsi_switch_str_param(&session->portal_type, buf); | |
3318 | case ISCSI_PARAM_DISCOVERY_PARENT_TYPE: | |
3319 | return iscsi_switch_str_param(&session->discovery_parent_type, | |
3320 | buf); | |
6a06a4b8 OG |
3321 | case ISCSI_PARAM_DISCOVERY_SESS: |
3322 | sscanf(buf, "%d", &val); | |
3323 | session->discovery_sess = !!val; | |
3324 | break; | |
ae56ff40 AC |
3325 | case ISCSI_PARAM_LOCAL_IPADDR: |
3326 | return iscsi_switch_str_param(&conn->local_ipaddr, buf); | |
a54a52ca MC |
3327 | default: |
3328 | return -ENOSYS; | |
3329 | } | |
3330 | ||
3331 | return 0; | |
3332 | } | |
3333 | EXPORT_SYMBOL_GPL(iscsi_set_param); | |
3334 | ||
3335 | int iscsi_session_get_param(struct iscsi_cls_session *cls_session, | |
3336 | enum iscsi_param param, char *buf) | |
3337 | { | |
75613521 | 3338 | struct iscsi_session *session = cls_session->dd_data; |
a54a52ca MC |
3339 | int len; |
3340 | ||
3341 | switch(param) { | |
843c0a8a MC |
3342 | case ISCSI_PARAM_FAST_ABORT: |
3343 | len = sprintf(buf, "%d\n", session->fast_abort); | |
3344 | break; | |
f6d5180c MC |
3345 | case ISCSI_PARAM_ABORT_TMO: |
3346 | len = sprintf(buf, "%d\n", session->abort_timeout); | |
3347 | break; | |
3348 | case ISCSI_PARAM_LU_RESET_TMO: | |
3349 | len = sprintf(buf, "%d\n", session->lu_reset_timeout); | |
3350 | break; | |
3fe5ae8b MC |
3351 | case ISCSI_PARAM_TGT_RESET_TMO: |
3352 | len = sprintf(buf, "%d\n", session->tgt_reset_timeout); | |
3353 | break; | |
a54a52ca MC |
3354 | case ISCSI_PARAM_INITIAL_R2T_EN: |
3355 | len = sprintf(buf, "%d\n", session->initial_r2t_en); | |
3356 | break; | |
3357 | case ISCSI_PARAM_MAX_R2T: | |
3358 | len = sprintf(buf, "%hu\n", session->max_r2t); | |
3359 | break; | |
3360 | case ISCSI_PARAM_IMM_DATA_EN: | |
3361 | len = sprintf(buf, "%d\n", session->imm_data_en); | |
3362 | break; | |
3363 | case ISCSI_PARAM_FIRST_BURST: | |
3364 | len = sprintf(buf, "%u\n", session->first_burst); | |
3365 | break; | |
3366 | case ISCSI_PARAM_MAX_BURST: | |
3367 | len = sprintf(buf, "%u\n", session->max_burst); | |
3368 | break; | |
3369 | case ISCSI_PARAM_PDU_INORDER_EN: | |
3370 | len = sprintf(buf, "%d\n", session->pdu_inorder_en); | |
3371 | break; | |
3372 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
3373 | len = sprintf(buf, "%d\n", session->dataseq_inorder_en); | |
3374 | break; | |
5f09e1f3 AC |
3375 | case ISCSI_PARAM_DEF_TASKMGMT_TMO: |
3376 | len = sprintf(buf, "%d\n", session->def_taskmgmt_tmo); | |
3377 | break; | |
a54a52ca MC |
3378 | case ISCSI_PARAM_ERL: |
3379 | len = sprintf(buf, "%d\n", session->erl); | |
3380 | break; | |
3381 | case ISCSI_PARAM_TARGET_NAME: | |
3382 | len = sprintf(buf, "%s\n", session->targetname); | |
3383 | break; | |
3c5c4801 VC |
3384 | case ISCSI_PARAM_TARGET_ALIAS: |
3385 | len = sprintf(buf, "%s\n", session->targetalias); | |
3386 | break; | |
a54a52ca MC |
3387 | case ISCSI_PARAM_TPGT: |
3388 | len = sprintf(buf, "%d\n", session->tpgt); | |
3389 | break; | |
b2c64167 MC |
3390 | case ISCSI_PARAM_USERNAME: |
3391 | len = sprintf(buf, "%s\n", session->username); | |
3392 | break; | |
3393 | case ISCSI_PARAM_USERNAME_IN: | |
3394 | len = sprintf(buf, "%s\n", session->username_in); | |
3395 | break; | |
3396 | case ISCSI_PARAM_PASSWORD: | |
3397 | len = sprintf(buf, "%s\n", session->password); | |
3398 | break; | |
3399 | case ISCSI_PARAM_PASSWORD_IN: | |
3400 | len = sprintf(buf, "%s\n", session->password_in); | |
3401 | break; | |
88dfd340 MC |
3402 | case ISCSI_PARAM_IFACE_NAME: |
3403 | len = sprintf(buf, "%s\n", session->ifacename); | |
3404 | break; | |
3405 | case ISCSI_PARAM_INITIATOR_NAME: | |
5700b1af | 3406 | len = sprintf(buf, "%s\n", session->initiatorname); |
88dfd340 | 3407 | break; |
3b9373e9 EW |
3408 | case ISCSI_PARAM_BOOT_ROOT: |
3409 | len = sprintf(buf, "%s\n", session->boot_root); | |
3410 | break; | |
3411 | case ISCSI_PARAM_BOOT_NIC: | |
3412 | len = sprintf(buf, "%s\n", session->boot_nic); | |
3413 | break; | |
3414 | case ISCSI_PARAM_BOOT_TARGET: | |
3415 | len = sprintf(buf, "%s\n", session->boot_target); | |
9a2307b1 | 3416 | break; |
f8525eb4 AC |
3417 | case ISCSI_PARAM_AUTO_SND_TGT_DISABLE: |
3418 | len = sprintf(buf, "%u\n", session->auto_snd_tgt_disable); | |
3419 | break; | |
3420 | case ISCSI_PARAM_DISCOVERY_SESS: | |
3421 | len = sprintf(buf, "%u\n", session->discovery_sess); | |
3422 | break; | |
3423 | case ISCSI_PARAM_PORTAL_TYPE: | |
3424 | len = sprintf(buf, "%s\n", session->portal_type); | |
3425 | break; | |
3426 | case ISCSI_PARAM_CHAP_AUTH_EN: | |
3427 | len = sprintf(buf, "%u\n", session->chap_auth_en); | |
3428 | break; | |
3429 | case ISCSI_PARAM_DISCOVERY_LOGOUT_EN: | |
3430 | len = sprintf(buf, "%u\n", session->discovery_logout_en); | |
3431 | break; | |
3432 | case ISCSI_PARAM_BIDI_CHAP_EN: | |
3433 | len = sprintf(buf, "%u\n", session->bidi_chap_en); | |
3434 | break; | |
3435 | case ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL: | |
3436 | len = sprintf(buf, "%u\n", session->discovery_auth_optional); | |
3437 | break; | |
3438 | case ISCSI_PARAM_DEF_TIME2WAIT: | |
3439 | len = sprintf(buf, "%d\n", session->time2wait); | |
3440 | break; | |
3441 | case ISCSI_PARAM_DEF_TIME2RETAIN: | |
3442 | len = sprintf(buf, "%d\n", session->time2retain); | |
3443 | break; | |
3444 | case ISCSI_PARAM_TSID: | |
3445 | len = sprintf(buf, "%u\n", session->tsid); | |
3446 | break; | |
3447 | case ISCSI_PARAM_ISID: | |
3448 | len = sprintf(buf, "%02x%02x%02x%02x%02x%02x\n", | |
3449 | session->isid[0], session->isid[1], | |
3450 | session->isid[2], session->isid[3], | |
3451 | session->isid[4], session->isid[5]); | |
3452 | break; | |
3453 | case ISCSI_PARAM_DISCOVERY_PARENT_IDX: | |
3454 | len = sprintf(buf, "%u\n", session->discovery_parent_idx); | |
3455 | break; | |
3456 | case ISCSI_PARAM_DISCOVERY_PARENT_TYPE: | |
3457 | if (session->discovery_parent_type) | |
3458 | len = sprintf(buf, "%s\n", | |
3459 | session->discovery_parent_type); | |
3460 | else | |
3461 | len = sprintf(buf, "\n"); | |
3b9373e9 | 3462 | break; |
a54a52ca MC |
3463 | default: |
3464 | return -ENOSYS; | |
3465 | } | |
3466 | ||
3467 | return len; | |
3468 | } | |
3469 | EXPORT_SYMBOL_GPL(iscsi_session_get_param); | |
3470 | ||
00f3708e MC |
3471 | int iscsi_conn_get_addr_param(struct sockaddr_storage *addr, |
3472 | enum iscsi_param param, char *buf) | |
3473 | { | |
3474 | struct sockaddr_in6 *sin6 = NULL; | |
3475 | struct sockaddr_in *sin = NULL; | |
3476 | int len; | |
3477 | ||
3478 | switch (addr->ss_family) { | |
3479 | case AF_INET: | |
3480 | sin = (struct sockaddr_in *)addr; | |
3481 | break; | |
3482 | case AF_INET6: | |
3483 | sin6 = (struct sockaddr_in6 *)addr; | |
3484 | break; | |
3485 | default: | |
3486 | return -EINVAL; | |
3487 | } | |
3488 | ||
3489 | switch (param) { | |
3490 | case ISCSI_PARAM_CONN_ADDRESS: | |
3491 | case ISCSI_HOST_PARAM_IPADDRESS: | |
3492 | if (sin) | |
3493 | len = sprintf(buf, "%pI4\n", &sin->sin_addr.s_addr); | |
3494 | else | |
3495 | len = sprintf(buf, "%pI6\n", &sin6->sin6_addr); | |
3496 | break; | |
3497 | case ISCSI_PARAM_CONN_PORT: | |
3498 | if (sin) | |
3499 | len = sprintf(buf, "%hu\n", be16_to_cpu(sin->sin_port)); | |
3500 | else | |
3501 | len = sprintf(buf, "%hu\n", | |
3502 | be16_to_cpu(sin6->sin6_port)); | |
3503 | break; | |
3504 | default: | |
3505 | return -EINVAL; | |
3506 | } | |
3507 | ||
3508 | return len; | |
3509 | } | |
3510 | EXPORT_SYMBOL_GPL(iscsi_conn_get_addr_param); | |
3511 | ||
a54a52ca MC |
3512 | int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn, |
3513 | enum iscsi_param param, char *buf) | |
3514 | { | |
3515 | struct iscsi_conn *conn = cls_conn->dd_data; | |
3516 | int len; | |
3517 | ||
3518 | switch(param) { | |
f6d5180c MC |
3519 | case ISCSI_PARAM_PING_TMO: |
3520 | len = sprintf(buf, "%u\n", conn->ping_timeout); | |
3521 | break; | |
3522 | case ISCSI_PARAM_RECV_TMO: | |
3523 | len = sprintf(buf, "%u\n", conn->recv_timeout); | |
3524 | break; | |
a54a52ca MC |
3525 | case ISCSI_PARAM_MAX_RECV_DLENGTH: |
3526 | len = sprintf(buf, "%u\n", conn->max_recv_dlength); | |
3527 | break; | |
3528 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
3529 | len = sprintf(buf, "%u\n", conn->max_xmit_dlength); | |
3530 | break; | |
3531 | case ISCSI_PARAM_HDRDGST_EN: | |
3532 | len = sprintf(buf, "%d\n", conn->hdrdgst_en); | |
3533 | break; | |
3534 | case ISCSI_PARAM_DATADGST_EN: | |
3535 | len = sprintf(buf, "%d\n", conn->datadgst_en); | |
3536 | break; | |
3537 | case ISCSI_PARAM_IFMARKER_EN: | |
3538 | len = sprintf(buf, "%d\n", conn->ifmarker_en); | |
3539 | break; | |
3540 | case ISCSI_PARAM_OFMARKER_EN: | |
3541 | len = sprintf(buf, "%d\n", conn->ofmarker_en); | |
3542 | break; | |
3543 | case ISCSI_PARAM_EXP_STATSN: | |
3544 | len = sprintf(buf, "%u\n", conn->exp_statsn); | |
3545 | break; | |
3546 | case ISCSI_PARAM_PERSISTENT_PORT: | |
3547 | len = sprintf(buf, "%d\n", conn->persistent_port); | |
3548 | break; | |
3549 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
3550 | len = sprintf(buf, "%s\n", conn->persistent_address); | |
3551 | break; | |
f8525eb4 AC |
3552 | case ISCSI_PARAM_STATSN: |
3553 | len = sprintf(buf, "%u\n", conn->statsn); | |
3554 | break; | |
3555 | case ISCSI_PARAM_MAX_SEGMENT_SIZE: | |
3556 | len = sprintf(buf, "%u\n", conn->max_segment_size); | |
3557 | break; | |
3558 | case ISCSI_PARAM_KEEPALIVE_TMO: | |
3559 | len = sprintf(buf, "%u\n", conn->keepalive_tmo); | |
3560 | break; | |
3561 | case ISCSI_PARAM_LOCAL_PORT: | |
3562 | len = sprintf(buf, "%u\n", conn->local_port); | |
3563 | break; | |
3564 | case ISCSI_PARAM_TCP_TIMESTAMP_STAT: | |
3565 | len = sprintf(buf, "%u\n", conn->tcp_timestamp_stat); | |
3566 | break; | |
3567 | case ISCSI_PARAM_TCP_NAGLE_DISABLE: | |
3568 | len = sprintf(buf, "%u\n", conn->tcp_nagle_disable); | |
3569 | break; | |
3570 | case ISCSI_PARAM_TCP_WSF_DISABLE: | |
3571 | len = sprintf(buf, "%u\n", conn->tcp_wsf_disable); | |
3572 | break; | |
3573 | case ISCSI_PARAM_TCP_TIMER_SCALE: | |
3574 | len = sprintf(buf, "%u\n", conn->tcp_timer_scale); | |
3575 | break; | |
3576 | case ISCSI_PARAM_TCP_TIMESTAMP_EN: | |
3577 | len = sprintf(buf, "%u\n", conn->tcp_timestamp_en); | |
3578 | break; | |
3579 | case ISCSI_PARAM_IP_FRAGMENT_DISABLE: | |
3580 | len = sprintf(buf, "%u\n", conn->fragment_disable); | |
3581 | break; | |
3582 | case ISCSI_PARAM_IPV4_TOS: | |
3583 | len = sprintf(buf, "%u\n", conn->ipv4_tos); | |
3584 | break; | |
3585 | case ISCSI_PARAM_IPV6_TC: | |
3586 | len = sprintf(buf, "%u\n", conn->ipv6_traffic_class); | |
3587 | break; | |
5f09e1f3 AC |
3588 | case ISCSI_PARAM_IPV6_FLOW_LABEL: |
3589 | len = sprintf(buf, "%u\n", conn->ipv6_flow_label); | |
3590 | break; | |
f8525eb4 AC |
3591 | case ISCSI_PARAM_IS_FW_ASSIGNED_IPV6: |
3592 | len = sprintf(buf, "%u\n", conn->is_fw_assigned_ipv6); | |
3593 | break; | |
3594 | case ISCSI_PARAM_TCP_XMIT_WSF: | |
3595 | len = sprintf(buf, "%u\n", conn->tcp_xmit_wsf); | |
3596 | break; | |
3597 | case ISCSI_PARAM_TCP_RECV_WSF: | |
3598 | len = sprintf(buf, "%u\n", conn->tcp_recv_wsf); | |
3599 | break; | |
ae56ff40 AC |
3600 | case ISCSI_PARAM_LOCAL_IPADDR: |
3601 | len = sprintf(buf, "%s\n", conn->local_ipaddr); | |
3602 | break; | |
a54a52ca MC |
3603 | default: |
3604 | return -ENOSYS; | |
3605 | } | |
3606 | ||
3607 | return len; | |
3608 | } | |
3609 | EXPORT_SYMBOL_GPL(iscsi_conn_get_param); | |
3610 | ||
0801c242 MC |
3611 | int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param, |
3612 | char *buf) | |
3613 | { | |
75613521 | 3614 | struct iscsi_host *ihost = shost_priv(shost); |
0801c242 MC |
3615 | int len; |
3616 | ||
3617 | switch (param) { | |
d8196ed2 | 3618 | case ISCSI_HOST_PARAM_NETDEV_NAME: |
5700b1af | 3619 | len = sprintf(buf, "%s\n", ihost->netdev); |
d8196ed2 | 3620 | break; |
0801c242 | 3621 | case ISCSI_HOST_PARAM_HWADDRESS: |
5700b1af | 3622 | len = sprintf(buf, "%s\n", ihost->hwaddress); |
0801c242 | 3623 | break; |
8ad5781a | 3624 | case ISCSI_HOST_PARAM_INITIATOR_NAME: |
5700b1af | 3625 | len = sprintf(buf, "%s\n", ihost->initiatorname); |
8ad5781a | 3626 | break; |
0801c242 MC |
3627 | default: |
3628 | return -ENOSYS; | |
3629 | } | |
3630 | ||
3631 | return len; | |
3632 | } | |
3633 | EXPORT_SYMBOL_GPL(iscsi_host_get_param); | |
3634 | ||
3635 | int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param, | |
3636 | char *buf, int buflen) | |
3637 | { | |
75613521 | 3638 | struct iscsi_host *ihost = shost_priv(shost); |
0801c242 MC |
3639 | |
3640 | switch (param) { | |
d8196ed2 | 3641 | case ISCSI_HOST_PARAM_NETDEV_NAME: |
5700b1af | 3642 | return iscsi_switch_str_param(&ihost->netdev, buf); |
0801c242 | 3643 | case ISCSI_HOST_PARAM_HWADDRESS: |
5700b1af | 3644 | return iscsi_switch_str_param(&ihost->hwaddress, buf); |
8ad5781a | 3645 | case ISCSI_HOST_PARAM_INITIATOR_NAME: |
5700b1af | 3646 | return iscsi_switch_str_param(&ihost->initiatorname, buf); |
0801c242 MC |
3647 | default: |
3648 | return -ENOSYS; | |
3649 | } | |
3650 | ||
3651 | return 0; | |
3652 | } | |
3653 | EXPORT_SYMBOL_GPL(iscsi_host_set_param); | |
3654 | ||
7996a778 MC |
3655 | MODULE_AUTHOR("Mike Christie"); |
3656 | MODULE_DESCRIPTION("iSCSI library functions"); | |
3657 | MODULE_LICENSE("GPL"); |