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> |
8eb00539 | 29 | #include <asm/unaligned.h> |
7996a778 MC |
30 | #include <net/tcp.h> |
31 | #include <scsi/scsi_cmnd.h> | |
32 | #include <scsi/scsi_device.h> | |
33 | #include <scsi/scsi_eh.h> | |
34 | #include <scsi/scsi_tcq.h> | |
35 | #include <scsi/scsi_host.h> | |
36 | #include <scsi/scsi.h> | |
37 | #include <scsi/iscsi_proto.h> | |
38 | #include <scsi/scsi_transport.h> | |
39 | #include <scsi/scsi_transport_iscsi.h> | |
40 | #include <scsi/libiscsi.h> | |
41 | ||
bd2199d4 EZ |
42 | static int iscsi_dbg_lib_conn; |
43 | module_param_named(debug_libiscsi_conn, iscsi_dbg_lib_conn, int, | |
44 | S_IRUGO | S_IWUSR); | |
45 | MODULE_PARM_DESC(debug_libiscsi_conn, | |
46 | "Turn on debugging for connections in libiscsi module. " | |
47 | "Set to 1 to turn on, and zero to turn off. Default is off."); | |
48 | ||
49 | static int iscsi_dbg_lib_session; | |
50 | module_param_named(debug_libiscsi_session, iscsi_dbg_lib_session, int, | |
51 | S_IRUGO | S_IWUSR); | |
52 | MODULE_PARM_DESC(debug_libiscsi_session, | |
53 | "Turn on debugging for sessions in libiscsi module. " | |
54 | "Set to 1 to turn on, and zero to turn off. Default is off."); | |
55 | ||
56 | static int iscsi_dbg_lib_eh; | |
57 | module_param_named(debug_libiscsi_eh, iscsi_dbg_lib_eh, int, | |
58 | S_IRUGO | S_IWUSR); | |
59 | MODULE_PARM_DESC(debug_libiscsi_eh, | |
60 | "Turn on debugging for error handling in libiscsi module. " | |
61 | "Set to 1 to turn on, and zero to turn off. Default is off."); | |
1b2c7af8 MC |
62 | |
63 | #define ISCSI_DBG_CONN(_conn, dbg_fmt, arg...) \ | |
64 | do { \ | |
bd2199d4 | 65 | if (iscsi_dbg_lib_conn) \ |
1b2c7af8 MC |
66 | iscsi_conn_printk(KERN_INFO, _conn, \ |
67 | "%s " dbg_fmt, \ | |
68 | __func__, ##arg); \ | |
69 | } while (0); | |
70 | ||
71 | #define ISCSI_DBG_SESSION(_session, dbg_fmt, arg...) \ | |
72 | do { \ | |
bd2199d4 EZ |
73 | if (iscsi_dbg_lib_session) \ |
74 | iscsi_session_printk(KERN_INFO, _session, \ | |
75 | "%s " dbg_fmt, \ | |
76 | __func__, ##arg); \ | |
77 | } while (0); | |
78 | ||
79 | #define ISCSI_DBG_EH(_session, dbg_fmt, arg...) \ | |
80 | do { \ | |
81 | if (iscsi_dbg_lib_eh) \ | |
1b2c7af8 MC |
82 | iscsi_session_printk(KERN_INFO, _session, \ |
83 | "%s " dbg_fmt, \ | |
84 | __func__, ##arg); \ | |
85 | } while (0); | |
86 | ||
32ae763e MC |
87 | inline void iscsi_conn_queue_work(struct iscsi_conn *conn) |
88 | { | |
89 | struct Scsi_Host *shost = conn->session->host; | |
90 | struct iscsi_host *ihost = shost_priv(shost); | |
91 | ||
1336aed1 MC |
92 | if (ihost->workq) |
93 | queue_work(ihost->workq, &conn->xmitwork); | |
32ae763e MC |
94 | } |
95 | EXPORT_SYMBOL_GPL(iscsi_conn_queue_work); | |
96 | ||
4c0ba5d2 MC |
97 | static void __iscsi_update_cmdsn(struct iscsi_session *session, |
98 | uint32_t exp_cmdsn, uint32_t max_cmdsn) | |
7996a778 | 99 | { |
77a23c21 MC |
100 | /* |
101 | * standard specifies this check for when to update expected and | |
102 | * max sequence numbers | |
103 | */ | |
104 | if (iscsi_sna_lt(max_cmdsn, exp_cmdsn - 1)) | |
105 | return; | |
106 | ||
107 | if (exp_cmdsn != session->exp_cmdsn && | |
108 | !iscsi_sna_lt(exp_cmdsn, session->exp_cmdsn)) | |
7996a778 MC |
109 | session->exp_cmdsn = exp_cmdsn; |
110 | ||
77a23c21 MC |
111 | if (max_cmdsn != session->max_cmdsn && |
112 | !iscsi_sna_lt(max_cmdsn, session->max_cmdsn)) { | |
113 | session->max_cmdsn = max_cmdsn; | |
114 | /* | |
115 | * if the window closed with IO queued, then kick the | |
116 | * xmit thread | |
117 | */ | |
3bbaaad9 | 118 | if (!list_empty(&session->leadconn->cmdqueue) || |
1336aed1 MC |
119 | !list_empty(&session->leadconn->mgmtqueue)) |
120 | iscsi_conn_queue_work(session->leadconn); | |
77a23c21 | 121 | } |
7996a778 | 122 | } |
4c0ba5d2 MC |
123 | |
124 | void iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr) | |
125 | { | |
126 | __iscsi_update_cmdsn(session, be32_to_cpu(hdr->exp_cmdsn), | |
127 | be32_to_cpu(hdr->max_cmdsn)); | |
128 | } | |
77a23c21 | 129 | EXPORT_SYMBOL_GPL(iscsi_update_cmdsn); |
7996a778 | 130 | |
577577da MC |
131 | /** |
132 | * iscsi_prep_data_out_pdu - initialize Data-Out | |
133 | * @task: scsi command task | |
134 | * @r2t: R2T info | |
135 | * @hdr: iscsi data in pdu | |
136 | * | |
137 | * Notes: | |
138 | * Initialize Data-Out within this R2T sequence and finds | |
139 | * proper data_offset within this SCSI command. | |
140 | * | |
141 | * This function is called with connection lock taken. | |
142 | **/ | |
143 | void iscsi_prep_data_out_pdu(struct iscsi_task *task, struct iscsi_r2t_info *r2t, | |
144 | struct iscsi_data *hdr) | |
7996a778 | 145 | { |
9c19a7d0 | 146 | struct iscsi_conn *conn = task->conn; |
577577da MC |
147 | unsigned int left = r2t->data_length - r2t->sent; |
148 | ||
149 | task->hdr_len = sizeof(struct iscsi_data); | |
7996a778 MC |
150 | |
151 | memset(hdr, 0, sizeof(struct iscsi_data)); | |
577577da MC |
152 | hdr->ttt = r2t->ttt; |
153 | hdr->datasn = cpu_to_be32(r2t->datasn); | |
154 | r2t->datasn++; | |
7996a778 | 155 | hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; |
55bdabdf | 156 | hdr->lun = task->lun; |
577577da MC |
157 | hdr->itt = task->hdr_itt; |
158 | hdr->exp_statsn = r2t->exp_statsn; | |
159 | hdr->offset = cpu_to_be32(r2t->data_offset + r2t->sent); | |
160 | if (left > conn->max_xmit_dlength) { | |
7996a778 | 161 | hton24(hdr->dlength, conn->max_xmit_dlength); |
577577da | 162 | r2t->data_count = conn->max_xmit_dlength; |
7996a778 MC |
163 | hdr->flags = 0; |
164 | } else { | |
577577da MC |
165 | hton24(hdr->dlength, left); |
166 | r2t->data_count = left; | |
7996a778 MC |
167 | hdr->flags = ISCSI_FLAG_CMD_FINAL; |
168 | } | |
577577da | 169 | conn->dataout_pdus_cnt++; |
7996a778 | 170 | } |
577577da | 171 | EXPORT_SYMBOL_GPL(iscsi_prep_data_out_pdu); |
7996a778 | 172 | |
9c19a7d0 | 173 | static int iscsi_add_hdr(struct iscsi_task *task, unsigned len) |
004d6530 | 174 | { |
9c19a7d0 | 175 | unsigned exp_len = task->hdr_len + len; |
004d6530 | 176 | |
9c19a7d0 | 177 | if (exp_len > task->hdr_max) { |
004d6530 BH |
178 | WARN_ON(1); |
179 | return -EINVAL; | |
180 | } | |
181 | ||
182 | WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */ | |
9c19a7d0 | 183 | task->hdr_len = exp_len; |
004d6530 BH |
184 | return 0; |
185 | } | |
186 | ||
38d1c069 BH |
187 | /* |
188 | * make an extended cdb AHS | |
189 | */ | |
9c19a7d0 | 190 | static int iscsi_prep_ecdb_ahs(struct iscsi_task *task) |
38d1c069 | 191 | { |
9c19a7d0 | 192 | struct scsi_cmnd *cmd = task->sc; |
38d1c069 BH |
193 | unsigned rlen, pad_len; |
194 | unsigned short ahslength; | |
195 | struct iscsi_ecdb_ahdr *ecdb_ahdr; | |
196 | int rc; | |
197 | ||
9c19a7d0 | 198 | ecdb_ahdr = iscsi_next_hdr(task); |
38d1c069 BH |
199 | rlen = cmd->cmd_len - ISCSI_CDB_SIZE; |
200 | ||
201 | BUG_ON(rlen > sizeof(ecdb_ahdr->ecdb)); | |
202 | ahslength = rlen + sizeof(ecdb_ahdr->reserved); | |
203 | ||
204 | pad_len = iscsi_padding(rlen); | |
205 | ||
9c19a7d0 | 206 | rc = iscsi_add_hdr(task, sizeof(ecdb_ahdr->ahslength) + |
38d1c069 BH |
207 | sizeof(ecdb_ahdr->ahstype) + ahslength + pad_len); |
208 | if (rc) | |
209 | return rc; | |
210 | ||
211 | if (pad_len) | |
212 | memset(&ecdb_ahdr->ecdb[rlen], 0, pad_len); | |
213 | ||
214 | ecdb_ahdr->ahslength = cpu_to_be16(ahslength); | |
215 | ecdb_ahdr->ahstype = ISCSI_AHSTYPE_CDB; | |
216 | ecdb_ahdr->reserved = 0; | |
217 | memcpy(ecdb_ahdr->ecdb, cmd->cmnd + ISCSI_CDB_SIZE, rlen); | |
218 | ||
1b2c7af8 MC |
219 | ISCSI_DBG_SESSION(task->conn->session, |
220 | "iscsi_prep_ecdb_ahs: varlen_cdb_len %d " | |
221 | "rlen %d pad_len %d ahs_length %d iscsi_headers_size " | |
222 | "%u\n", cmd->cmd_len, rlen, pad_len, ahslength, | |
223 | task->hdr_len); | |
38d1c069 BH |
224 | return 0; |
225 | } | |
226 | ||
9c19a7d0 | 227 | static int iscsi_prep_bidi_ahs(struct iscsi_task *task) |
c07d4444 | 228 | { |
9c19a7d0 | 229 | struct scsi_cmnd *sc = task->sc; |
c07d4444 BH |
230 | struct iscsi_rlength_ahdr *rlen_ahdr; |
231 | int rc; | |
232 | ||
9c19a7d0 MC |
233 | rlen_ahdr = iscsi_next_hdr(task); |
234 | rc = iscsi_add_hdr(task, sizeof(*rlen_ahdr)); | |
c07d4444 BH |
235 | if (rc) |
236 | return rc; | |
237 | ||
238 | rlen_ahdr->ahslength = | |
239 | cpu_to_be16(sizeof(rlen_ahdr->read_length) + | |
240 | sizeof(rlen_ahdr->reserved)); | |
241 | rlen_ahdr->ahstype = ISCSI_AHSTYPE_RLENGTH; | |
242 | rlen_ahdr->reserved = 0; | |
243 | rlen_ahdr->read_length = cpu_to_be32(scsi_in(sc)->length); | |
244 | ||
1b2c7af8 MC |
245 | ISCSI_DBG_SESSION(task->conn->session, |
246 | "bidi-in rlen_ahdr->read_length(%d) " | |
247 | "rlen_ahdr->ahslength(%d)\n", | |
248 | be32_to_cpu(rlen_ahdr->read_length), | |
249 | be16_to_cpu(rlen_ahdr->ahslength)); | |
c07d4444 BH |
250 | return 0; |
251 | } | |
252 | ||
5d12c05e MC |
253 | /** |
254 | * iscsi_check_tmf_restrictions - check if a task is affected by TMF | |
255 | * @task: iscsi task | |
256 | * @opcode: opcode to check for | |
257 | * | |
258 | * During TMF a task has to be checked if it's affected. | |
259 | * All unrelated I/O can be passed through, but I/O to the | |
260 | * affected LUN should be restricted. | |
261 | * If 'fast_abort' is set we won't be sending any I/O to the | |
262 | * affected LUN. | |
263 | * Otherwise the target is waiting for all TTTs to be completed, | |
264 | * so we have to send all outstanding Data-Out PDUs to the target. | |
265 | */ | |
266 | static int iscsi_check_tmf_restrictions(struct iscsi_task *task, int opcode) | |
267 | { | |
268 | struct iscsi_conn *conn = task->conn; | |
269 | struct iscsi_tm *tmf = &conn->tmhdr; | |
270 | unsigned int hdr_lun; | |
271 | ||
272 | if (conn->tmf_state == TMF_INITIAL) | |
273 | return 0; | |
274 | ||
275 | if ((tmf->opcode & ISCSI_OPCODE_MASK) != ISCSI_OP_SCSI_TMFUNC) | |
276 | return 0; | |
277 | ||
278 | switch (ISCSI_TM_FUNC_VALUE(tmf)) { | |
279 | case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: | |
280 | /* | |
281 | * Allow PDUs for unrelated LUNs | |
282 | */ | |
55bdabdf | 283 | hdr_lun = scsilun_to_int(&tmf->lun); |
5d12c05e MC |
284 | if (hdr_lun != task->sc->device->lun) |
285 | return 0; | |
3fe5ae8b MC |
286 | /* fall through */ |
287 | case ISCSI_TM_FUNC_TARGET_WARM_RESET: | |
5d12c05e MC |
288 | /* |
289 | * Fail all SCSI cmd PDUs | |
290 | */ | |
291 | if (opcode != ISCSI_OP_SCSI_DATA_OUT) { | |
292 | iscsi_conn_printk(KERN_INFO, conn, | |
293 | "task [op %x/%x itt " | |
3fe5ae8b | 294 | "0x%x/0x%x] " |
5d12c05e MC |
295 | "rejected.\n", |
296 | task->hdr->opcode, opcode, | |
3fe5ae8b | 297 | task->itt, task->hdr_itt); |
5d12c05e MC |
298 | return -EACCES; |
299 | } | |
300 | /* | |
301 | * And also all data-out PDUs in response to R2T | |
302 | * if fast_abort is set. | |
303 | */ | |
304 | if (conn->session->fast_abort) { | |
305 | iscsi_conn_printk(KERN_INFO, conn, | |
306 | "task [op %x/%x itt " | |
3fe5ae8b | 307 | "0x%x/0x%x] fast abort.\n", |
5d12c05e | 308 | task->hdr->opcode, opcode, |
3fe5ae8b | 309 | task->itt, task->hdr_itt); |
5d12c05e MC |
310 | return -EACCES; |
311 | } | |
312 | break; | |
313 | case ISCSI_TM_FUNC_ABORT_TASK: | |
314 | /* | |
315 | * the caller has already checked if the task | |
316 | * they want to abort was in the pending queue so if | |
317 | * we are here the cmd pdu has gone out already, and | |
318 | * we will only hit this for data-outs | |
319 | */ | |
320 | if (opcode == ISCSI_OP_SCSI_DATA_OUT && | |
321 | task->hdr_itt == tmf->rtt) { | |
322 | ISCSI_DBG_SESSION(conn->session, | |
323 | "Preventing task %x/%x from sending " | |
324 | "data-out due to abort task in " | |
325 | "progress\n", task->itt, | |
326 | task->hdr_itt); | |
327 | return -EACCES; | |
328 | } | |
329 | break; | |
330 | } | |
331 | ||
332 | return 0; | |
333 | } | |
334 | ||
7996a778 MC |
335 | /** |
336 | * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu | |
9c19a7d0 | 337 | * @task: iscsi task |
7996a778 MC |
338 | * |
339 | * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set | |
340 | * fields like dlength or final based on how much data it sends | |
341 | */ | |
9c19a7d0 | 342 | static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task) |
7996a778 | 343 | { |
9c19a7d0 | 344 | struct iscsi_conn *conn = task->conn; |
7996a778 | 345 | struct iscsi_session *session = conn->session; |
9c19a7d0 | 346 | struct scsi_cmnd *sc = task->sc; |
12352183 | 347 | struct iscsi_scsi_req *hdr; |
38d1c069 | 348 | unsigned hdrlength, cmd_len; |
262ef636 | 349 | itt_t itt; |
004d6530 | 350 | int rc; |
7996a778 | 351 | |
5d12c05e MC |
352 | rc = iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_CMD); |
353 | if (rc) | |
354 | return rc; | |
355 | ||
184b57c6 MC |
356 | if (conn->session->tt->alloc_pdu) { |
357 | rc = conn->session->tt->alloc_pdu(task, ISCSI_OP_SCSI_CMD); | |
358 | if (rc) | |
359 | return rc; | |
360 | } | |
12352183 | 361 | hdr = (struct iscsi_scsi_req *)task->hdr; |
262ef636 | 362 | itt = hdr->itt; |
577577da MC |
363 | memset(hdr, 0, sizeof(*hdr)); |
364 | ||
2ff79d52 MC |
365 | if (session->tt->parse_pdu_itt) |
366 | hdr->itt = task->hdr_itt = itt; | |
367 | else | |
368 | hdr->itt = task->hdr_itt = build_itt(task->itt, | |
369 | task->conn->session->age); | |
9c19a7d0 MC |
370 | task->hdr_len = 0; |
371 | rc = iscsi_add_hdr(task, sizeof(*hdr)); | |
004d6530 BH |
372 | if (rc) |
373 | return rc; | |
a8ac6311 OK |
374 | hdr->opcode = ISCSI_OP_SCSI_CMD; |
375 | hdr->flags = ISCSI_ATTR_SIMPLE; | |
55bdabdf AG |
376 | int_to_scsilun(sc->device->lun, &hdr->lun); |
377 | task->lun = hdr->lun; | |
a8ac6311 | 378 | hdr->exp_statsn = cpu_to_be32(conn->exp_statsn); |
38d1c069 BH |
379 | cmd_len = sc->cmd_len; |
380 | if (cmd_len < ISCSI_CDB_SIZE) | |
381 | memset(&hdr->cdb[cmd_len], 0, ISCSI_CDB_SIZE - cmd_len); | |
382 | else if (cmd_len > ISCSI_CDB_SIZE) { | |
9c19a7d0 | 383 | rc = iscsi_prep_ecdb_ahs(task); |
38d1c069 BH |
384 | if (rc) |
385 | return rc; | |
386 | cmd_len = ISCSI_CDB_SIZE; | |
387 | } | |
388 | memcpy(hdr->cdb, sc->cmnd, cmd_len); | |
7996a778 | 389 | |
9c19a7d0 | 390 | task->imm_count = 0; |
c07d4444 BH |
391 | if (scsi_bidi_cmnd(sc)) { |
392 | hdr->flags |= ISCSI_FLAG_CMD_READ; | |
9c19a7d0 | 393 | rc = iscsi_prep_bidi_ahs(task); |
c07d4444 BH |
394 | if (rc) |
395 | return rc; | |
396 | } | |
7996a778 | 397 | if (sc->sc_data_direction == DMA_TO_DEVICE) { |
c07d4444 | 398 | unsigned out_len = scsi_out(sc)->length; |
577577da MC |
399 | struct iscsi_r2t_info *r2t = &task->unsol_r2t; |
400 | ||
c07d4444 | 401 | hdr->data_length = cpu_to_be32(out_len); |
7996a778 MC |
402 | hdr->flags |= ISCSI_FLAG_CMD_WRITE; |
403 | /* | |
404 | * Write counters: | |
405 | * | |
406 | * imm_count bytes to be sent right after | |
407 | * SCSI PDU Header | |
408 | * | |
409 | * unsol_count bytes(as Data-Out) to be sent | |
410 | * without R2T ack right after | |
411 | * immediate data | |
412 | * | |
577577da | 413 | * r2t data_length bytes to be sent via R2T ack's |
7996a778 MC |
414 | * |
415 | * pad_count bytes to be sent as zero-padding | |
416 | */ | |
577577da | 417 | memset(r2t, 0, sizeof(*r2t)); |
7996a778 MC |
418 | |
419 | if (session->imm_data_en) { | |
c07d4444 | 420 | if (out_len >= session->first_burst) |
9c19a7d0 | 421 | task->imm_count = min(session->first_burst, |
7996a778 MC |
422 | conn->max_xmit_dlength); |
423 | else | |
9c19a7d0 | 424 | task->imm_count = min(out_len, |
7996a778 | 425 | conn->max_xmit_dlength); |
9c19a7d0 | 426 | hton24(hdr->dlength, task->imm_count); |
7996a778 | 427 | } else |
a8ac6311 | 428 | zero_data(hdr->dlength); |
7996a778 | 429 | |
ffd0436e | 430 | if (!session->initial_r2t_en) { |
577577da MC |
431 | r2t->data_length = min(session->first_burst, out_len) - |
432 | task->imm_count; | |
433 | r2t->data_offset = task->imm_count; | |
434 | r2t->ttt = cpu_to_be32(ISCSI_RESERVED_TAG); | |
435 | r2t->exp_statsn = cpu_to_be32(conn->exp_statsn); | |
ffd0436e MC |
436 | } |
437 | ||
577577da | 438 | if (!task->unsol_r2t.data_length) |
7996a778 | 439 | /* No unsolicit Data-Out's */ |
a8ac6311 | 440 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; |
7996a778 | 441 | } else { |
7996a778 MC |
442 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; |
443 | zero_data(hdr->dlength); | |
c07d4444 | 444 | hdr->data_length = cpu_to_be32(scsi_in(sc)->length); |
7996a778 MC |
445 | |
446 | if (sc->sc_data_direction == DMA_FROM_DEVICE) | |
447 | hdr->flags |= ISCSI_FLAG_CMD_READ; | |
448 | } | |
449 | ||
004d6530 | 450 | /* calculate size of additional header segments (AHSs) */ |
9c19a7d0 | 451 | hdrlength = task->hdr_len - sizeof(*hdr); |
004d6530 BH |
452 | |
453 | WARN_ON(hdrlength & (ISCSI_PAD_LEN-1)); | |
454 | hdrlength /= ISCSI_PAD_LEN; | |
455 | ||
456 | WARN_ON(hdrlength >= 256); | |
457 | hdr->hlength = hdrlength & 0xFF; | |
96b1f96d | 458 | hdr->cmdsn = task->cmdsn = cpu_to_be32(session->cmdsn); |
004d6530 | 459 | |
577577da | 460 | if (session->tt->init_task && session->tt->init_task(task)) |
052d0144 MC |
461 | return -EIO; |
462 | ||
9c19a7d0 | 463 | task->state = ISCSI_TASK_RUNNING; |
d3305f34 | 464 | session->cmdsn++; |
77a23c21 | 465 | |
a8ac6311 | 466 | conn->scsicmd_pdus_cnt++; |
1b2c7af8 MC |
467 | ISCSI_DBG_SESSION(session, "iscsi prep [%s cid %d sc %p cdb 0x%x " |
468 | "itt 0x%x len %d bidi_len %d cmdsn %d win %d]\n", | |
469 | scsi_bidi_cmnd(sc) ? "bidirectional" : | |
470 | sc->sc_data_direction == DMA_TO_DEVICE ? | |
471 | "write" : "read", conn->id, sc, sc->cmnd[0], | |
472 | task->itt, scsi_bufflen(sc), | |
473 | scsi_bidi_cmnd(sc) ? scsi_in(sc)->length : 0, | |
474 | session->cmdsn, | |
475 | session->max_cmdsn - session->exp_cmdsn + 1); | |
004d6530 | 476 | return 0; |
7996a778 | 477 | } |
7996a778 MC |
478 | |
479 | /** | |
3bbaaad9 | 480 | * iscsi_free_task - free a task |
9c19a7d0 | 481 | * @task: iscsi cmd task |
7996a778 MC |
482 | * |
483 | * Must be called with session lock. | |
3e5c28ad MC |
484 | * This function returns the scsi command to scsi-ml or cleans |
485 | * up mgmt tasks then returns the task to the pool. | |
7996a778 | 486 | */ |
3bbaaad9 | 487 | static void iscsi_free_task(struct iscsi_task *task) |
7996a778 | 488 | { |
9c19a7d0 | 489 | struct iscsi_conn *conn = task->conn; |
c1635cb7 | 490 | struct iscsi_session *session = conn->session; |
9c19a7d0 | 491 | struct scsi_cmnd *sc = task->sc; |
f41d4721 | 492 | int oldstate = task->state; |
7996a778 | 493 | |
4421c9eb MC |
494 | ISCSI_DBG_SESSION(session, "freeing task itt 0x%x state %d sc %p\n", |
495 | task->itt, task->state, task->sc); | |
496 | ||
577577da | 497 | session->tt->cleanup_task(task); |
3bbaaad9 | 498 | task->state = ISCSI_TASK_FREE; |
9c19a7d0 | 499 | task->sc = NULL; |
3e5c28ad | 500 | /* |
9c19a7d0 | 501 | * login task is preallocated so do not free |
3e5c28ad | 502 | */ |
9c19a7d0 | 503 | if (conn->login_task == task) |
3e5c28ad MC |
504 | return; |
505 | ||
7acd72eb | 506 | kfifo_in(&session->cmdpool.queue, (void*)&task, sizeof(void*)); |
052d0144 | 507 | |
3e5c28ad | 508 | if (sc) { |
9c19a7d0 | 509 | task->sc = NULL; |
3e5c28ad MC |
510 | /* SCSI eh reuses commands to verify us */ |
511 | sc->SCp.ptr = NULL; | |
512 | /* | |
f41d4721 MC |
513 | * queue command may call this to free the task, so |
514 | * it will decide how to return sc to scsi-ml. | |
3e5c28ad | 515 | */ |
f41d4721 | 516 | if (oldstate != ISCSI_TASK_REQUEUE_SCSIQ) |
3e5c28ad MC |
517 | sc->scsi_done(sc); |
518 | } | |
7996a778 MC |
519 | } |
520 | ||
913e5bf4 | 521 | void __iscsi_get_task(struct iscsi_task *task) |
60ecebf5 | 522 | { |
9c19a7d0 | 523 | atomic_inc(&task->refcount); |
60ecebf5 | 524 | } |
913e5bf4 | 525 | EXPORT_SYMBOL_GPL(__iscsi_get_task); |
60ecebf5 | 526 | |
8eea2f55 | 527 | void __iscsi_put_task(struct iscsi_task *task) |
60ecebf5 | 528 | { |
9c19a7d0 | 529 | if (atomic_dec_and_test(&task->refcount)) |
3bbaaad9 | 530 | iscsi_free_task(task); |
60ecebf5 | 531 | } |
8eea2f55 | 532 | EXPORT_SYMBOL_GPL(__iscsi_put_task); |
60ecebf5 | 533 | |
9c19a7d0 | 534 | void iscsi_put_task(struct iscsi_task *task) |
3e5c28ad | 535 | { |
9c19a7d0 | 536 | struct iscsi_session *session = task->conn->session; |
3e5c28ad MC |
537 | |
538 | spin_lock_bh(&session->lock); | |
9c19a7d0 | 539 | __iscsi_put_task(task); |
3e5c28ad MC |
540 | spin_unlock_bh(&session->lock); |
541 | } | |
9c19a7d0 | 542 | EXPORT_SYMBOL_GPL(iscsi_put_task); |
3e5c28ad | 543 | |
3bbaaad9 MC |
544 | /** |
545 | * iscsi_complete_task - finish a task | |
546 | * @task: iscsi cmd task | |
b3cd5050 | 547 | * @state: state to complete task with |
3bbaaad9 MC |
548 | * |
549 | * Must be called with session lock. | |
550 | */ | |
b3cd5050 | 551 | static void iscsi_complete_task(struct iscsi_task *task, int state) |
3bbaaad9 MC |
552 | { |
553 | struct iscsi_conn *conn = task->conn; | |
554 | ||
4421c9eb MC |
555 | ISCSI_DBG_SESSION(conn->session, |
556 | "complete task itt 0x%x state %d sc %p\n", | |
557 | task->itt, task->state, task->sc); | |
b3cd5050 MC |
558 | if (task->state == ISCSI_TASK_COMPLETED || |
559 | task->state == ISCSI_TASK_ABRT_TMF || | |
f41d4721 MC |
560 | task->state == ISCSI_TASK_ABRT_SESS_RECOV || |
561 | task->state == ISCSI_TASK_REQUEUE_SCSIQ) | |
3bbaaad9 MC |
562 | return; |
563 | WARN_ON_ONCE(task->state == ISCSI_TASK_FREE); | |
b3cd5050 | 564 | task->state = state; |
3bbaaad9 MC |
565 | |
566 | if (!list_empty(&task->running)) | |
567 | list_del_init(&task->running); | |
568 | ||
569 | if (conn->task == task) | |
570 | conn->task = NULL; | |
571 | ||
572 | if (conn->ping_task == task) | |
573 | conn->ping_task = NULL; | |
574 | ||
575 | /* release get from queueing */ | |
576 | __iscsi_put_task(task); | |
577 | } | |
578 | ||
4c0ba5d2 MC |
579 | /** |
580 | * iscsi_complete_scsi_task - finish scsi task normally | |
581 | * @task: iscsi task for scsi cmd | |
582 | * @exp_cmdsn: expected cmd sn in cpu format | |
583 | * @max_cmdsn: max cmd sn in cpu format | |
584 | * | |
585 | * This is used when drivers do not need or cannot perform | |
586 | * lower level pdu processing. | |
587 | * | |
588 | * Called with session lock | |
589 | */ | |
590 | void iscsi_complete_scsi_task(struct iscsi_task *task, | |
591 | uint32_t exp_cmdsn, uint32_t max_cmdsn) | |
592 | { | |
593 | struct iscsi_conn *conn = task->conn; | |
594 | ||
595 | ISCSI_DBG_SESSION(conn->session, "[itt 0x%x]\n", task->itt); | |
596 | ||
597 | conn->last_recv = jiffies; | |
598 | __iscsi_update_cmdsn(conn->session, exp_cmdsn, max_cmdsn); | |
599 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); | |
600 | } | |
601 | EXPORT_SYMBOL_GPL(iscsi_complete_scsi_task); | |
602 | ||
603 | ||
b3a7ea8d | 604 | /* |
3bbaaad9 MC |
605 | * session lock must be held and if not called for a task that is |
606 | * still pending or from the xmit thread, then xmit thread must | |
607 | * be suspended. | |
b3a7ea8d | 608 | */ |
3bbaaad9 | 609 | static void fail_scsi_task(struct iscsi_task *task, int err) |
b3a7ea8d | 610 | { |
3bbaaad9 | 611 | struct iscsi_conn *conn = task->conn; |
b3a7ea8d | 612 | struct scsi_cmnd *sc; |
b3cd5050 | 613 | int state; |
b3a7ea8d | 614 | |
3bbaaad9 MC |
615 | /* |
616 | * if a command completes and we get a successful tmf response | |
617 | * we will hit this because the scsi eh abort code does not take | |
618 | * a ref to the task. | |
619 | */ | |
9c19a7d0 | 620 | sc = task->sc; |
b3a7ea8d MC |
621 | if (!sc) |
622 | return; | |
623 | ||
b3cd5050 | 624 | if (task->state == ISCSI_TASK_PENDING) { |
b3a7ea8d MC |
625 | /* |
626 | * cmd never made it to the xmit thread, so we should not count | |
627 | * the cmd in the sequencing | |
628 | */ | |
629 | conn->session->queued_cmdsn--; | |
b3cd5050 MC |
630 | /* it was never sent so just complete like normal */ |
631 | state = ISCSI_TASK_COMPLETED; | |
632 | } else if (err == DID_TRANSPORT_DISRUPTED) | |
633 | state = ISCSI_TASK_ABRT_SESS_RECOV; | |
634 | else | |
635 | state = ISCSI_TASK_ABRT_TMF; | |
b3a7ea8d | 636 | |
b3cd5050 | 637 | sc->result = err << 16; |
c07d4444 BH |
638 | if (!scsi_bidi_cmnd(sc)) |
639 | scsi_set_resid(sc, scsi_bufflen(sc)); | |
640 | else { | |
641 | scsi_out(sc)->resid = scsi_out(sc)->length; | |
642 | scsi_in(sc)->resid = scsi_in(sc)->length; | |
643 | } | |
3e5c28ad | 644 | |
b3cd5050 | 645 | iscsi_complete_task(task, state); |
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: | |
783 | __iscsi_put_task(task); | |
784 | return NULL; | |
f6d5180c MC |
785 | } |
786 | ||
787 | int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr, | |
788 | char *data, uint32_t data_size) | |
789 | { | |
790 | struct iscsi_conn *conn = cls_conn->dd_data; | |
791 | struct iscsi_session *session = conn->session; | |
792 | int err = 0; | |
793 | ||
794 | spin_lock_bh(&session->lock); | |
795 | if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size)) | |
796 | err = -EPERM; | |
797 | spin_unlock_bh(&session->lock); | |
f6d5180c MC |
798 | return err; |
799 | } | |
800 | EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu); | |
801 | ||
7996a778 MC |
802 | /** |
803 | * iscsi_cmd_rsp - SCSI Command Response processing | |
804 | * @conn: iscsi connection | |
805 | * @hdr: iscsi header | |
9c19a7d0 | 806 | * @task: scsi command task |
7996a778 MC |
807 | * @data: cmd data buffer |
808 | * @datalen: len of buffer | |
809 | * | |
810 | * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and | |
9c19a7d0 | 811 | * then completes the command and task. |
7996a778 | 812 | **/ |
77a23c21 | 813 | static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
9c19a7d0 | 814 | struct iscsi_task *task, char *data, |
77a23c21 | 815 | int datalen) |
7996a778 | 816 | { |
12352183 | 817 | struct iscsi_scsi_rsp *rhdr = (struct iscsi_scsi_rsp *)hdr; |
7996a778 | 818 | struct iscsi_session *session = conn->session; |
9c19a7d0 | 819 | struct scsi_cmnd *sc = task->sc; |
7996a778 | 820 | |
77a23c21 | 821 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr); |
7996a778 MC |
822 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; |
823 | ||
824 | sc->result = (DID_OK << 16) | rhdr->cmd_status; | |
825 | ||
826 | if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) { | |
827 | sc->result = DID_ERROR << 16; | |
828 | goto out; | |
829 | } | |
830 | ||
831 | if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) { | |
9b80cb4b | 832 | uint16_t senselen; |
7996a778 MC |
833 | |
834 | if (datalen < 2) { | |
835 | invalid_datalen: | |
322d739d MC |
836 | iscsi_conn_printk(KERN_ERR, conn, |
837 | "Got CHECK_CONDITION but invalid data " | |
838 | "buffer size of %d\n", datalen); | |
7996a778 MC |
839 | sc->result = DID_BAD_TARGET << 16; |
840 | goto out; | |
841 | } | |
842 | ||
8f333991 | 843 | senselen = get_unaligned_be16(data); |
7996a778 MC |
844 | if (datalen < senselen) |
845 | goto invalid_datalen; | |
846 | ||
847 | memcpy(sc->sense_buffer, data + 2, | |
9b80cb4b | 848 | min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE)); |
1b2c7af8 MC |
849 | ISCSI_DBG_SESSION(session, "copied %d bytes of sense\n", |
850 | min_t(uint16_t, senselen, | |
851 | SCSI_SENSE_BUFFERSIZE)); | |
7996a778 MC |
852 | } |
853 | ||
c07d4444 BH |
854 | if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW | |
855 | ISCSI_FLAG_CMD_BIDI_OVERFLOW)) { | |
856 | int res_count = be32_to_cpu(rhdr->bi_residual_count); | |
857 | ||
858 | if (scsi_bidi_cmnd(sc) && res_count > 0 && | |
859 | (rhdr->flags & ISCSI_FLAG_CMD_BIDI_OVERFLOW || | |
860 | res_count <= scsi_in(sc)->length)) | |
861 | scsi_in(sc)->resid = res_count; | |
862 | else | |
863 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
864 | } | |
865 | ||
7207fea4 BH |
866 | if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW | |
867 | ISCSI_FLAG_CMD_OVERFLOW)) { | |
7996a778 MC |
868 | int res_count = be32_to_cpu(rhdr->residual_count); |
869 | ||
7207fea4 BH |
870 | if (res_count > 0 && |
871 | (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || | |
872 | res_count <= scsi_bufflen(sc))) | |
c07d4444 | 873 | /* write side for bidi or uni-io set_resid */ |
1c138991 | 874 | scsi_set_resid(sc, res_count); |
7996a778 MC |
875 | else |
876 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
c07d4444 | 877 | } |
7996a778 | 878 | out: |
3bbaaad9 | 879 | ISCSI_DBG_SESSION(session, "cmd rsp done [sc %p res %d itt 0x%x]\n", |
1b2c7af8 | 880 | sc, sc->result, task->itt); |
7996a778 | 881 | conn->scsirsp_pdus_cnt++; |
b3cd5050 | 882 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); |
7996a778 MC |
883 | } |
884 | ||
1d9edf02 MC |
885 | /** |
886 | * iscsi_data_in_rsp - SCSI Data-In Response processing | |
887 | * @conn: iscsi connection | |
888 | * @hdr: iscsi pdu | |
889 | * @task: scsi command task | |
890 | **/ | |
891 | static void | |
892 | iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
893 | struct iscsi_task *task) | |
894 | { | |
895 | struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)hdr; | |
896 | struct scsi_cmnd *sc = task->sc; | |
897 | ||
898 | if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS)) | |
899 | return; | |
900 | ||
edbc9aa0 | 901 | iscsi_update_cmdsn(conn->session, (struct iscsi_nopin *)hdr); |
1d9edf02 MC |
902 | sc->result = (DID_OK << 16) | rhdr->cmd_status; |
903 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; | |
904 | if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW | | |
905 | ISCSI_FLAG_DATA_OVERFLOW)) { | |
906 | int res_count = be32_to_cpu(rhdr->residual_count); | |
907 | ||
908 | if (res_count > 0 && | |
909 | (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || | |
910 | res_count <= scsi_in(sc)->length)) | |
911 | scsi_in(sc)->resid = res_count; | |
912 | else | |
913 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
914 | } | |
915 | ||
3bbaaad9 MC |
916 | ISCSI_DBG_SESSION(conn->session, "data in with status done " |
917 | "[sc %p res %d itt 0x%x]\n", | |
918 | sc, sc->result, task->itt); | |
1d9edf02 | 919 | conn->scsirsp_pdus_cnt++; |
b3cd5050 | 920 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); |
1d9edf02 MC |
921 | } |
922 | ||
7ea8b828 MC |
923 | static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr) |
924 | { | |
925 | struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr; | |
926 | ||
927 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
928 | conn->tmfrsp_pdus_cnt++; | |
929 | ||
843c0a8a | 930 | if (conn->tmf_state != TMF_QUEUED) |
7ea8b828 MC |
931 | return; |
932 | ||
933 | if (tmf->response == ISCSI_TMF_RSP_COMPLETE) | |
843c0a8a | 934 | conn->tmf_state = TMF_SUCCESS; |
7ea8b828 | 935 | else if (tmf->response == ISCSI_TMF_RSP_NO_TASK) |
843c0a8a | 936 | conn->tmf_state = TMF_NOT_FOUND; |
7ea8b828 | 937 | else |
843c0a8a | 938 | conn->tmf_state = TMF_FAILED; |
7ea8b828 MC |
939 | wake_up(&conn->ehwait); |
940 | } | |
941 | ||
f6d5180c MC |
942 | static void iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr) |
943 | { | |
944 | struct iscsi_nopout hdr; | |
9c19a7d0 | 945 | struct iscsi_task *task; |
f6d5180c | 946 | |
9c19a7d0 | 947 | if (!rhdr && conn->ping_task) |
f6d5180c MC |
948 | return; |
949 | ||
950 | memset(&hdr, 0, sizeof(struct iscsi_nopout)); | |
951 | hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE; | |
952 | hdr.flags = ISCSI_FLAG_CMD_FINAL; | |
953 | ||
954 | if (rhdr) { | |
55bdabdf | 955 | hdr.lun = rhdr->lun; |
f6d5180c MC |
956 | hdr.ttt = rhdr->ttt; |
957 | hdr.itt = RESERVED_ITT; | |
958 | } else | |
959 | hdr.ttt = RESERVED_ITT; | |
960 | ||
9c19a7d0 MC |
961 | task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0); |
962 | if (!task) | |
322d739d | 963 | iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n"); |
d3acf022 MC |
964 | else if (!rhdr) { |
965 | /* only track our nops */ | |
966 | conn->ping_task = task; | |
967 | conn->last_ping = jiffies; | |
968 | } | |
f6d5180c MC |
969 | } |
970 | ||
8afa1439 MC |
971 | static int iscsi_nop_out_rsp(struct iscsi_task *task, |
972 | struct iscsi_nopin *nop, char *data, int datalen) | |
973 | { | |
974 | struct iscsi_conn *conn = task->conn; | |
975 | int rc = 0; | |
976 | ||
977 | if (conn->ping_task != task) { | |
978 | /* | |
979 | * If this is not in response to one of our | |
980 | * nops then it must be from userspace. | |
981 | */ | |
982 | if (iscsi_recv_pdu(conn->cls_conn, (struct iscsi_hdr *)nop, | |
983 | data, datalen)) | |
984 | rc = ISCSI_ERR_CONN_FAILED; | |
985 | } else | |
986 | mod_timer(&conn->transport_timer, jiffies + conn->recv_timeout); | |
987 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); | |
988 | return rc; | |
989 | } | |
990 | ||
62f38300 MC |
991 | static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
992 | char *data, int datalen) | |
993 | { | |
994 | struct iscsi_reject *reject = (struct iscsi_reject *)hdr; | |
995 | struct iscsi_hdr rejected_pdu; | |
8afa1439 | 996 | int opcode, rc = 0; |
62f38300 MC |
997 | |
998 | conn->exp_statsn = be32_to_cpu(reject->statsn) + 1; | |
999 | ||
8afa1439 MC |
1000 | if (ntoh24(reject->dlength) > datalen || |
1001 | ntoh24(reject->dlength) < sizeof(struct iscsi_hdr)) { | |
1002 | iscsi_conn_printk(KERN_ERR, conn, "Cannot handle rejected " | |
1003 | "pdu. Invalid data length (pdu dlength " | |
1004 | "%u, datalen %d\n", ntoh24(reject->dlength), | |
1005 | datalen); | |
1006 | return ISCSI_ERR_PROTO; | |
1007 | } | |
1008 | memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr)); | |
1009 | opcode = rejected_pdu.opcode & ISCSI_OPCODE_MASK; | |
1010 | ||
1011 | switch (reject->reason) { | |
1012 | case ISCSI_REASON_DATA_DIGEST_ERROR: | |
1013 | iscsi_conn_printk(KERN_ERR, conn, | |
1014 | "pdu (op 0x%x itt 0x%x) rejected " | |
1015 | "due to DataDigest error.\n", | |
1016 | rejected_pdu.itt, opcode); | |
1017 | break; | |
1018 | case ISCSI_REASON_IMM_CMD_REJECT: | |
1019 | iscsi_conn_printk(KERN_ERR, conn, | |
1020 | "pdu (op 0x%x itt 0x%x) rejected. Too many " | |
1021 | "immediate commands.\n", | |
1022 | rejected_pdu.itt, opcode); | |
1023 | /* | |
1024 | * We only send one TMF at a time so if the target could not | |
1025 | * handle it, then it should get fixed (RFC mandates that | |
1026 | * a target can handle one immediate TMF per conn). | |
1027 | * | |
1028 | * For nops-outs, we could have sent more than one if | |
1029 | * the target is sending us lots of nop-ins | |
1030 | */ | |
1031 | if (opcode != ISCSI_OP_NOOP_OUT) | |
1032 | return 0; | |
62f38300 | 1033 | |
8afa1439 MC |
1034 | if (rejected_pdu.itt == cpu_to_be32(ISCSI_RESERVED_TAG)) |
1035 | /* | |
1036 | * nop-out in response to target's nop-out rejected. | |
1037 | * Just resend. | |
1038 | */ | |
1039 | iscsi_send_nopout(conn, | |
1040 | (struct iscsi_nopin*)&rejected_pdu); | |
1041 | else { | |
1042 | struct iscsi_task *task; | |
1043 | /* | |
1044 | * Our nop as ping got dropped. We know the target | |
1045 | * and transport are ok so just clean up | |
1046 | */ | |
1047 | task = iscsi_itt_to_task(conn, rejected_pdu.itt); | |
1048 | if (!task) { | |
1049 | iscsi_conn_printk(KERN_ERR, conn, | |
1050 | "Invalid pdu reject. Could " | |
1051 | "not lookup rejected task.\n"); | |
1052 | rc = ISCSI_ERR_BAD_ITT; | |
1053 | } else | |
1054 | rc = iscsi_nop_out_rsp(task, | |
1055 | (struct iscsi_nopin*)&rejected_pdu, | |
1056 | NULL, 0); | |
62f38300 | 1057 | } |
8afa1439 MC |
1058 | break; |
1059 | default: | |
1060 | iscsi_conn_printk(KERN_ERR, conn, | |
1061 | "pdu (op 0x%x itt 0x%x) rejected. Reason " | |
1062 | "code 0x%x\n", rejected_pdu.itt, | |
1063 | rejected_pdu.opcode, reject->reason); | |
1064 | break; | |
62f38300 | 1065 | } |
8afa1439 | 1066 | return rc; |
62f38300 MC |
1067 | } |
1068 | ||
913e5bf4 MC |
1069 | /** |
1070 | * iscsi_itt_to_task - look up task by itt | |
1071 | * @conn: iscsi connection | |
1072 | * @itt: itt | |
1073 | * | |
1074 | * This should be used for mgmt tasks like login and nops, or if | |
1075 | * the LDD's itt space does not include the session age. | |
1076 | * | |
1077 | * The session lock must be held. | |
1078 | */ | |
8f9256ce | 1079 | struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *conn, itt_t itt) |
913e5bf4 MC |
1080 | { |
1081 | struct iscsi_session *session = conn->session; | |
262ef636 | 1082 | int i; |
913e5bf4 MC |
1083 | |
1084 | if (itt == RESERVED_ITT) | |
1085 | return NULL; | |
1086 | ||
262ef636 MC |
1087 | if (session->tt->parse_pdu_itt) |
1088 | session->tt->parse_pdu_itt(conn, itt, &i, NULL); | |
1089 | else | |
1090 | i = get_itt(itt); | |
913e5bf4 MC |
1091 | if (i >= session->cmds_max) |
1092 | return NULL; | |
1093 | ||
1094 | return session->cmds[i]; | |
1095 | } | |
8f9256ce | 1096 | EXPORT_SYMBOL_GPL(iscsi_itt_to_task); |
913e5bf4 | 1097 | |
7996a778 MC |
1098 | /** |
1099 | * __iscsi_complete_pdu - complete pdu | |
1100 | * @conn: iscsi conn | |
1101 | * @hdr: iscsi header | |
1102 | * @data: data buffer | |
1103 | * @datalen: len of data buffer | |
1104 | * | |
1105 | * Completes pdu processing by freeing any resources allocated at | |
1106 | * queuecommand or send generic. session lock must be held and verify | |
1107 | * itt must have been called. | |
1108 | */ | |
913e5bf4 MC |
1109 | int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
1110 | char *data, int datalen) | |
7996a778 MC |
1111 | { |
1112 | struct iscsi_session *session = conn->session; | |
1113 | int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0; | |
9c19a7d0 | 1114 | struct iscsi_task *task; |
7996a778 MC |
1115 | uint32_t itt; |
1116 | ||
f6d5180c | 1117 | conn->last_recv = jiffies; |
0af967f5 MC |
1118 | rc = iscsi_verify_itt(conn, hdr->itt); |
1119 | if (rc) | |
1120 | return rc; | |
1121 | ||
b4377356 AV |
1122 | if (hdr->itt != RESERVED_ITT) |
1123 | itt = get_itt(hdr->itt); | |
7996a778 | 1124 | else |
b4377356 | 1125 | itt = ~0U; |
7996a778 | 1126 | |
1b2c7af8 MC |
1127 | ISCSI_DBG_SESSION(session, "[op 0x%x cid %d itt 0x%x len %d]\n", |
1128 | opcode, conn->id, itt, datalen); | |
7996a778 | 1129 | |
3e5c28ad | 1130 | if (itt == ~0U) { |
77a23c21 | 1131 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); |
62f38300 | 1132 | |
7996a778 MC |
1133 | switch(opcode) { |
1134 | case ISCSI_OP_NOOP_IN: | |
40527afe | 1135 | if (datalen) { |
7996a778 | 1136 | rc = ISCSI_ERR_PROTO; |
40527afe MC |
1137 | break; |
1138 | } | |
1139 | ||
b4377356 | 1140 | if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG)) |
40527afe MC |
1141 | break; |
1142 | ||
f6d5180c | 1143 | iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr); |
7996a778 MC |
1144 | break; |
1145 | case ISCSI_OP_REJECT: | |
62f38300 MC |
1146 | rc = iscsi_handle_reject(conn, hdr, data, datalen); |
1147 | break; | |
7996a778 | 1148 | case ISCSI_OP_ASYNC_EVENT: |
8d2860b3 | 1149 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; |
5831c737 MC |
1150 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) |
1151 | rc = ISCSI_ERR_CONN_FAILED; | |
7996a778 MC |
1152 | break; |
1153 | default: | |
1154 | rc = ISCSI_ERR_BAD_OPCODE; | |
1155 | break; | |
1156 | } | |
3e5c28ad MC |
1157 | goto out; |
1158 | } | |
1159 | ||
3e5c28ad MC |
1160 | switch(opcode) { |
1161 | case ISCSI_OP_SCSI_CMD_RSP: | |
913e5bf4 MC |
1162 | case ISCSI_OP_SCSI_DATA_IN: |
1163 | task = iscsi_itt_to_ctask(conn, hdr->itt); | |
1164 | if (!task) | |
1165 | return ISCSI_ERR_BAD_ITT; | |
d355e57d | 1166 | task->last_xfer = jiffies; |
913e5bf4 MC |
1167 | break; |
1168 | case ISCSI_OP_R2T: | |
1169 | /* | |
1170 | * LLD handles R2Ts if they need to. | |
1171 | */ | |
1172 | return 0; | |
1173 | case ISCSI_OP_LOGOUT_RSP: | |
1174 | case ISCSI_OP_LOGIN_RSP: | |
1175 | case ISCSI_OP_TEXT_RSP: | |
1176 | case ISCSI_OP_SCSI_TMFUNC_RSP: | |
1177 | case ISCSI_OP_NOOP_IN: | |
1178 | task = iscsi_itt_to_task(conn, hdr->itt); | |
1179 | if (!task) | |
1180 | return ISCSI_ERR_BAD_ITT; | |
1181 | break; | |
1182 | default: | |
1183 | return ISCSI_ERR_BAD_OPCODE; | |
1184 | } | |
1185 | ||
1186 | switch(opcode) { | |
1187 | case ISCSI_OP_SCSI_CMD_RSP: | |
9c19a7d0 | 1188 | iscsi_scsi_cmd_rsp(conn, hdr, task, data, datalen); |
3e5c28ad MC |
1189 | break; |
1190 | case ISCSI_OP_SCSI_DATA_IN: | |
1d9edf02 | 1191 | iscsi_data_in_rsp(conn, hdr, task); |
3e5c28ad | 1192 | break; |
3e5c28ad MC |
1193 | case ISCSI_OP_LOGOUT_RSP: |
1194 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
1195 | if (datalen) { | |
1196 | rc = ISCSI_ERR_PROTO; | |
1197 | break; | |
1198 | } | |
1199 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
1200 | goto recv_pdu; | |
1201 | case ISCSI_OP_LOGIN_RSP: | |
1202 | case ISCSI_OP_TEXT_RSP: | |
1203 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
1204 | /* | |
1205 | * login related PDU's exp_statsn is handled in | |
1206 | * userspace | |
1207 | */ | |
1208 | goto recv_pdu; | |
1209 | case ISCSI_OP_SCSI_TMFUNC_RSP: | |
1210 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
1211 | if (datalen) { | |
1212 | rc = ISCSI_ERR_PROTO; | |
1213 | break; | |
1214 | } | |
1215 | ||
1216 | iscsi_tmf_rsp(conn, hdr); | |
b3cd5050 | 1217 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); |
3e5c28ad MC |
1218 | break; |
1219 | case ISCSI_OP_NOOP_IN: | |
1220 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
1221 | if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) { | |
1222 | rc = ISCSI_ERR_PROTO; | |
1223 | break; | |
1224 | } | |
1225 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
1226 | ||
8afa1439 MC |
1227 | rc = iscsi_nop_out_rsp(task, (struct iscsi_nopin*)hdr, |
1228 | data, datalen); | |
3e5c28ad MC |
1229 | break; |
1230 | default: | |
1231 | rc = ISCSI_ERR_BAD_OPCODE; | |
1232 | break; | |
1233 | } | |
7996a778 | 1234 | |
3e5c28ad MC |
1235 | out: |
1236 | return rc; | |
1237 | recv_pdu: | |
1238 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) | |
1239 | rc = ISCSI_ERR_CONN_FAILED; | |
b3cd5050 | 1240 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); |
7996a778 MC |
1241 | return rc; |
1242 | } | |
913e5bf4 | 1243 | EXPORT_SYMBOL_GPL(__iscsi_complete_pdu); |
7996a778 MC |
1244 | |
1245 | int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
1246 | char *data, int datalen) | |
1247 | { | |
1248 | int rc; | |
1249 | ||
1250 | spin_lock(&conn->session->lock); | |
1251 | rc = __iscsi_complete_pdu(conn, hdr, data, datalen); | |
1252 | spin_unlock(&conn->session->lock); | |
1253 | return rc; | |
1254 | } | |
1255 | EXPORT_SYMBOL_GPL(iscsi_complete_pdu); | |
1256 | ||
0af967f5 | 1257 | int iscsi_verify_itt(struct iscsi_conn *conn, itt_t itt) |
7996a778 MC |
1258 | { |
1259 | struct iscsi_session *session = conn->session; | |
262ef636 | 1260 | int age = 0, i = 0; |
7996a778 | 1261 | |
0af967f5 MC |
1262 | if (itt == RESERVED_ITT) |
1263 | return 0; | |
7996a778 | 1264 | |
262ef636 MC |
1265 | if (session->tt->parse_pdu_itt) |
1266 | session->tt->parse_pdu_itt(conn, itt, &i, &age); | |
1267 | else { | |
1268 | i = get_itt(itt); | |
1269 | age = ((__force u32)itt >> ISCSI_AGE_SHIFT) & ISCSI_AGE_MASK; | |
1270 | } | |
1271 | ||
1272 | if (age != session->age) { | |
0af967f5 MC |
1273 | iscsi_conn_printk(KERN_ERR, conn, |
1274 | "received itt %x expected session age (%x)\n", | |
913e5bf4 | 1275 | (__force u32)itt, session->age); |
0af967f5 MC |
1276 | return ISCSI_ERR_BAD_ITT; |
1277 | } | |
7996a778 | 1278 | |
3e5c28ad MC |
1279 | if (i >= session->cmds_max) { |
1280 | iscsi_conn_printk(KERN_ERR, conn, | |
1281 | "received invalid itt index %u (max cmds " | |
1282 | "%u.\n", i, session->cmds_max); | |
1283 | return ISCSI_ERR_BAD_ITT; | |
7996a778 | 1284 | } |
7996a778 MC |
1285 | return 0; |
1286 | } | |
1287 | EXPORT_SYMBOL_GPL(iscsi_verify_itt); | |
1288 | ||
913e5bf4 MC |
1289 | /** |
1290 | * iscsi_itt_to_ctask - look up ctask by itt | |
1291 | * @conn: iscsi connection | |
1292 | * @itt: itt | |
1293 | * | |
1294 | * This should be used for cmd tasks. | |
1295 | * | |
1296 | * The session lock must be held. | |
1297 | */ | |
1298 | struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *conn, itt_t itt) | |
0af967f5 | 1299 | { |
9c19a7d0 | 1300 | struct iscsi_task *task; |
0af967f5 MC |
1301 | |
1302 | if (iscsi_verify_itt(conn, itt)) | |
1303 | return NULL; | |
1304 | ||
913e5bf4 MC |
1305 | task = iscsi_itt_to_task(conn, itt); |
1306 | if (!task || !task->sc) | |
0af967f5 MC |
1307 | return NULL; |
1308 | ||
913e5bf4 MC |
1309 | if (task->sc->SCp.phase != conn->session->age) { |
1310 | iscsi_session_printk(KERN_ERR, conn->session, | |
1311 | "task's session age %d, expected %d\n", | |
1312 | task->sc->SCp.phase, conn->session->age); | |
0af967f5 | 1313 | return NULL; |
913e5bf4 | 1314 | } |
0af967f5 | 1315 | |
9c19a7d0 | 1316 | return task; |
0af967f5 MC |
1317 | } |
1318 | EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask); | |
1319 | ||
40a06e75 | 1320 | void iscsi_session_failure(struct iscsi_session *session, |
e5bd7b54 MC |
1321 | enum iscsi_err err) |
1322 | { | |
e5bd7b54 MC |
1323 | struct iscsi_conn *conn; |
1324 | struct device *dev; | |
e5bd7b54 | 1325 | |
bfcf72e4 | 1326 | spin_lock_bh(&session->lock); |
e5bd7b54 MC |
1327 | conn = session->leadconn; |
1328 | if (session->state == ISCSI_STATE_TERMINATE || !conn) { | |
bfcf72e4 | 1329 | spin_unlock_bh(&session->lock); |
e5bd7b54 MC |
1330 | return; |
1331 | } | |
1332 | ||
1333 | dev = get_device(&conn->cls_conn->dev); | |
bfcf72e4 | 1334 | spin_unlock_bh(&session->lock); |
e5bd7b54 MC |
1335 | if (!dev) |
1336 | return; | |
1337 | /* | |
1338 | * if the host is being removed bypass the connection | |
1339 | * recovery initialization because we are going to kill | |
1340 | * the session. | |
1341 | */ | |
1342 | if (err == ISCSI_ERR_INVALID_HOST) | |
1343 | iscsi_conn_error_event(conn->cls_conn, err); | |
1344 | else | |
1345 | iscsi_conn_failure(conn, err); | |
1346 | put_device(dev); | |
1347 | } | |
1348 | EXPORT_SYMBOL_GPL(iscsi_session_failure); | |
1349 | ||
7996a778 MC |
1350 | void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err) |
1351 | { | |
1352 | struct iscsi_session *session = conn->session; | |
7996a778 | 1353 | |
bfcf72e4 | 1354 | spin_lock_bh(&session->lock); |
656cffc9 | 1355 | if (session->state == ISCSI_STATE_FAILED) { |
bfcf72e4 | 1356 | spin_unlock_bh(&session->lock); |
656cffc9 MC |
1357 | return; |
1358 | } | |
1359 | ||
67a61114 | 1360 | if (conn->stop_stage == 0) |
7996a778 | 1361 | session->state = ISCSI_STATE_FAILED; |
bfcf72e4 | 1362 | spin_unlock_bh(&session->lock); |
e5bd7b54 | 1363 | |
7996a778 MC |
1364 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); |
1365 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
e5bd7b54 | 1366 | iscsi_conn_error_event(conn->cls_conn, err); |
7996a778 MC |
1367 | } |
1368 | EXPORT_SYMBOL_GPL(iscsi_conn_failure); | |
1369 | ||
77a23c21 MC |
1370 | static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn) |
1371 | { | |
1372 | struct iscsi_session *session = conn->session; | |
1373 | ||
1374 | /* | |
1375 | * Check for iSCSI window and take care of CmdSN wrap-around | |
1376 | */ | |
e0726407 | 1377 | if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) { |
1b2c7af8 MC |
1378 | ISCSI_DBG_SESSION(session, "iSCSI CmdSN closed. ExpCmdSn " |
1379 | "%u MaxCmdSN %u CmdSN %u/%u\n", | |
1380 | session->exp_cmdsn, session->max_cmdsn, | |
1381 | session->cmdsn, session->queued_cmdsn); | |
77a23c21 MC |
1382 | return -ENOSPC; |
1383 | } | |
1384 | return 0; | |
1385 | } | |
1386 | ||
9c19a7d0 | 1387 | static int iscsi_xmit_task(struct iscsi_conn *conn) |
77a23c21 | 1388 | { |
9c19a7d0 | 1389 | struct iscsi_task *task = conn->task; |
843c0a8a | 1390 | int rc; |
77a23c21 | 1391 | |
70b31c15 MC |
1392 | if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) |
1393 | return -ENODATA; | |
1394 | ||
9c19a7d0 | 1395 | __iscsi_get_task(task); |
77a23c21 | 1396 | spin_unlock_bh(&conn->session->lock); |
9c19a7d0 | 1397 | rc = conn->session->tt->xmit_task(task); |
77a23c21 | 1398 | spin_lock_bh(&conn->session->lock); |
d355e57d | 1399 | if (!rc) { |
9c19a7d0 | 1400 | /* done with this task */ |
d355e57d | 1401 | task->last_xfer = jiffies; |
9c19a7d0 | 1402 | conn->task = NULL; |
d355e57d MC |
1403 | } |
1404 | __iscsi_put_task(task); | |
77a23c21 MC |
1405 | return rc; |
1406 | } | |
1407 | ||
843c0a8a | 1408 | /** |
9c19a7d0 MC |
1409 | * iscsi_requeue_task - requeue task to run from session workqueue |
1410 | * @task: task to requeue | |
843c0a8a | 1411 | * |
9c19a7d0 | 1412 | * LLDs that need to run a task from the session workqueue should call |
052d0144 MC |
1413 | * this. The session lock must be held. This should only be called |
1414 | * by software drivers. | |
843c0a8a | 1415 | */ |
9c19a7d0 | 1416 | void iscsi_requeue_task(struct iscsi_task *task) |
843c0a8a | 1417 | { |
9c19a7d0 | 1418 | struct iscsi_conn *conn = task->conn; |
843c0a8a | 1419 | |
3bbaaad9 MC |
1420 | /* |
1421 | * this may be on the requeue list already if the xmit_task callout | |
1422 | * is handling the r2ts while we are adding new ones | |
1423 | */ | |
1424 | if (list_empty(&task->running)) | |
1425 | list_add_tail(&task->running, &conn->requeue); | |
32ae763e | 1426 | iscsi_conn_queue_work(conn); |
843c0a8a | 1427 | } |
9c19a7d0 | 1428 | EXPORT_SYMBOL_GPL(iscsi_requeue_task); |
843c0a8a | 1429 | |
7996a778 MC |
1430 | /** |
1431 | * iscsi_data_xmit - xmit any command into the scheduled connection | |
1432 | * @conn: iscsi connection | |
1433 | * | |
1434 | * Notes: | |
1435 | * The function can return -EAGAIN in which case the caller must | |
1436 | * re-schedule it again later or recover. '0' return code means | |
1437 | * successful xmit. | |
1438 | **/ | |
1439 | static int iscsi_data_xmit(struct iscsi_conn *conn) | |
1440 | { | |
5d12c05e | 1441 | struct iscsi_task *task; |
3219e529 | 1442 | int rc = 0; |
7996a778 | 1443 | |
77a23c21 | 1444 | spin_lock_bh(&conn->session->lock); |
70b31c15 | 1445 | if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) { |
1b2c7af8 | 1446 | ISCSI_DBG_SESSION(conn->session, "Tx suspended!\n"); |
77a23c21 | 1447 | spin_unlock_bh(&conn->session->lock); |
3219e529 | 1448 | return -ENODATA; |
7996a778 | 1449 | } |
7996a778 | 1450 | |
9c19a7d0 MC |
1451 | if (conn->task) { |
1452 | rc = iscsi_xmit_task(conn); | |
3219e529 | 1453 | if (rc) |
70b31c15 | 1454 | goto done; |
7996a778 MC |
1455 | } |
1456 | ||
77a23c21 MC |
1457 | /* |
1458 | * process mgmt pdus like nops before commands since we should | |
1459 | * only have one nop-out as a ping from us and targets should not | |
1460 | * overflow us with nop-ins | |
1461 | */ | |
1462 | check_mgmt: | |
843c0a8a | 1463 | while (!list_empty(&conn->mgmtqueue)) { |
9c19a7d0 MC |
1464 | conn->task = list_entry(conn->mgmtqueue.next, |
1465 | struct iscsi_task, running); | |
3bbaaad9 | 1466 | list_del_init(&conn->task->running); |
9c19a7d0 MC |
1467 | if (iscsi_prep_mgmt_task(conn, conn->task)) { |
1468 | __iscsi_put_task(conn->task); | |
1469 | conn->task = NULL; | |
b3a7ea8d MC |
1470 | continue; |
1471 | } | |
9c19a7d0 | 1472 | rc = iscsi_xmit_task(conn); |
77a23c21 | 1473 | if (rc) |
70b31c15 | 1474 | goto done; |
7996a778 MC |
1475 | } |
1476 | ||
843c0a8a | 1477 | /* process pending command queue */ |
3bbaaad9 | 1478 | while (!list_empty(&conn->cmdqueue)) { |
5d12c05e MC |
1479 | conn->task = list_entry(conn->cmdqueue.next, struct iscsi_task, |
1480 | running); | |
3bbaaad9 | 1481 | list_del_init(&conn->task->running); |
b3a7ea8d | 1482 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) { |
b3cd5050 | 1483 | fail_scsi_task(conn->task, DID_IMM_RETRY); |
b3a7ea8d MC |
1484 | continue; |
1485 | } | |
577577da MC |
1486 | rc = iscsi_prep_scsi_cmd_pdu(conn->task); |
1487 | if (rc) { | |
5d12c05e | 1488 | if (rc == -ENOMEM || rc == -EACCES) { |
3bbaaad9 MC |
1489 | list_add_tail(&conn->task->running, |
1490 | &conn->cmdqueue); | |
577577da | 1491 | conn->task = NULL; |
70b31c15 | 1492 | goto done; |
577577da | 1493 | } else |
b3cd5050 | 1494 | fail_scsi_task(conn->task, DID_ABORT); |
004d6530 BH |
1495 | continue; |
1496 | } | |
9c19a7d0 | 1497 | rc = iscsi_xmit_task(conn); |
77a23c21 | 1498 | if (rc) |
70b31c15 | 1499 | goto done; |
77a23c21 | 1500 | /* |
9c19a7d0 | 1501 | * we could continuously get new task requests so |
77a23c21 MC |
1502 | * we need to check the mgmt queue for nops that need to |
1503 | * be sent to aviod starvation | |
1504 | */ | |
843c0a8a MC |
1505 | if (!list_empty(&conn->mgmtqueue)) |
1506 | goto check_mgmt; | |
1507 | } | |
1508 | ||
1509 | while (!list_empty(&conn->requeue)) { | |
b3a7ea8d MC |
1510 | /* |
1511 | * we always do fastlogout - conn stop code will clean up. | |
1512 | */ | |
1513 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) | |
1514 | break; | |
1515 | ||
5d12c05e MC |
1516 | task = list_entry(conn->requeue.next, struct iscsi_task, |
1517 | running); | |
1518 | if (iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_DATA_OUT)) | |
1519 | break; | |
1520 | ||
1521 | conn->task = task; | |
3bbaaad9 | 1522 | list_del_init(&conn->task->running); |
9c19a7d0 | 1523 | conn->task->state = ISCSI_TASK_RUNNING; |
9c19a7d0 | 1524 | rc = iscsi_xmit_task(conn); |
843c0a8a | 1525 | if (rc) |
70b31c15 | 1526 | goto done; |
843c0a8a | 1527 | if (!list_empty(&conn->mgmtqueue)) |
77a23c21 | 1528 | goto check_mgmt; |
7996a778 | 1529 | } |
b6c395ed | 1530 | spin_unlock_bh(&conn->session->lock); |
3219e529 | 1531 | return -ENODATA; |
7996a778 | 1532 | |
70b31c15 | 1533 | done: |
77a23c21 | 1534 | spin_unlock_bh(&conn->session->lock); |
3219e529 | 1535 | return rc; |
7996a778 MC |
1536 | } |
1537 | ||
c4028958 | 1538 | static void iscsi_xmitworker(struct work_struct *work) |
7996a778 | 1539 | { |
c4028958 DH |
1540 | struct iscsi_conn *conn = |
1541 | container_of(work, struct iscsi_conn, xmitwork); | |
3219e529 | 1542 | int rc; |
7996a778 MC |
1543 | /* |
1544 | * serialize Xmit worker on a per-connection basis. | |
1545 | */ | |
3219e529 MC |
1546 | do { |
1547 | rc = iscsi_data_xmit(conn); | |
1548 | } while (rc >= 0 || rc == -EAGAIN); | |
7996a778 MC |
1549 | } |
1550 | ||
577577da MC |
1551 | static inline struct iscsi_task *iscsi_alloc_task(struct iscsi_conn *conn, |
1552 | struct scsi_cmnd *sc) | |
1553 | { | |
1554 | struct iscsi_task *task; | |
1555 | ||
7acd72eb | 1556 | if (!kfifo_out(&conn->session->cmdpool.queue, |
577577da MC |
1557 | (void *) &task, sizeof(void *))) |
1558 | return NULL; | |
1559 | ||
1560 | sc->SCp.phase = conn->session->age; | |
1561 | sc->SCp.ptr = (char *) task; | |
1562 | ||
1563 | atomic_set(&task->refcount, 1); | |
1564 | task->state = ISCSI_TASK_PENDING; | |
1565 | task->conn = conn; | |
1566 | task->sc = sc; | |
d355e57d MC |
1567 | task->have_checked_conn = false; |
1568 | task->last_timeout = jiffies; | |
1569 | task->last_xfer = jiffies; | |
577577da MC |
1570 | INIT_LIST_HEAD(&task->running); |
1571 | return task; | |
1572 | } | |
1573 | ||
7996a778 MC |
1574 | enum { |
1575 | FAILURE_BAD_HOST = 1, | |
1576 | FAILURE_SESSION_FAILED, | |
1577 | FAILURE_SESSION_FREED, | |
1578 | FAILURE_WINDOW_CLOSED, | |
60ecebf5 | 1579 | FAILURE_OOM, |
7996a778 | 1580 | FAILURE_SESSION_TERMINATE, |
656cffc9 | 1581 | FAILURE_SESSION_IN_RECOVERY, |
7996a778 | 1582 | FAILURE_SESSION_RECOVERY_TIMEOUT, |
b3a7ea8d | 1583 | FAILURE_SESSION_LOGGING_OUT, |
6eabafbe | 1584 | FAILURE_SESSION_NOT_READY, |
7996a778 MC |
1585 | }; |
1586 | ||
f41d4721 | 1587 | int iscsi_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc) |
7996a778 | 1588 | { |
75613521 | 1589 | struct iscsi_cls_session *cls_session; |
1336aed1 | 1590 | struct iscsi_host *ihost; |
7996a778 MC |
1591 | int reason = 0; |
1592 | struct iscsi_session *session; | |
1593 | struct iscsi_conn *conn; | |
9c19a7d0 | 1594 | struct iscsi_task *task = NULL; |
7996a778 | 1595 | |
7996a778 | 1596 | sc->result = 0; |
f47f2cf5 | 1597 | sc->SCp.ptr = NULL; |
7996a778 | 1598 | |
1336aed1 | 1599 | ihost = shost_priv(host); |
7996a778 | 1600 | |
75613521 MC |
1601 | cls_session = starget_to_session(scsi_target(sc->device)); |
1602 | session = cls_session->dd_data; | |
f41d4721 | 1603 | spin_lock_bh(&session->lock); |
7996a778 | 1604 | |
75613521 | 1605 | reason = iscsi_session_chkready(cls_session); |
6eabafbe MC |
1606 | if (reason) { |
1607 | sc->result = reason; | |
1608 | goto fault; | |
1609 | } | |
1610 | ||
301e0f7e | 1611 | if (session->state != ISCSI_STATE_LOGGED_IN) { |
656cffc9 MC |
1612 | /* |
1613 | * to handle the race between when we set the recovery state | |
1614 | * and block the session we requeue here (commands could | |
1615 | * be entering our queuecommand while a block is starting | |
1616 | * up because the block code is not locked) | |
1617 | */ | |
9000bcd6 | 1618 | switch (session->state) { |
301e0f7e | 1619 | case ISCSI_STATE_FAILED: |
9000bcd6 | 1620 | case ISCSI_STATE_IN_RECOVERY: |
656cffc9 | 1621 | reason = FAILURE_SESSION_IN_RECOVERY; |
301e0f7e MC |
1622 | sc->result = DID_IMM_RETRY << 16; |
1623 | break; | |
9000bcd6 MC |
1624 | case ISCSI_STATE_LOGGING_OUT: |
1625 | reason = FAILURE_SESSION_LOGGING_OUT; | |
301e0f7e MC |
1626 | sc->result = DID_IMM_RETRY << 16; |
1627 | break; | |
b3a7ea8d | 1628 | case ISCSI_STATE_RECOVERY_FAILED: |
656cffc9 | 1629 | reason = FAILURE_SESSION_RECOVERY_TIMEOUT; |
56d7fcfa | 1630 | sc->result = DID_TRANSPORT_FAILFAST << 16; |
b3a7ea8d MC |
1631 | break; |
1632 | case ISCSI_STATE_TERMINATE: | |
656cffc9 | 1633 | reason = FAILURE_SESSION_TERMINATE; |
6eabafbe | 1634 | sc->result = DID_NO_CONNECT << 16; |
b3a7ea8d | 1635 | break; |
b3a7ea8d | 1636 | default: |
656cffc9 | 1637 | reason = FAILURE_SESSION_FREED; |
6eabafbe | 1638 | sc->result = DID_NO_CONNECT << 16; |
b3a7ea8d | 1639 | } |
7996a778 MC |
1640 | goto fault; |
1641 | } | |
1642 | ||
7996a778 | 1643 | conn = session->leadconn; |
98644047 MC |
1644 | if (!conn) { |
1645 | reason = FAILURE_SESSION_FREED; | |
6eabafbe | 1646 | sc->result = DID_NO_CONNECT << 16; |
98644047 MC |
1647 | goto fault; |
1648 | } | |
7996a778 | 1649 | |
661134ad MC |
1650 | if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) { |
1651 | reason = FAILURE_SESSION_IN_RECOVERY; | |
1652 | sc->result = DID_REQUEUE; | |
1653 | goto fault; | |
1654 | } | |
1655 | ||
77a23c21 MC |
1656 | if (iscsi_check_cmdsn_window_closed(conn)) { |
1657 | reason = FAILURE_WINDOW_CLOSED; | |
1658 | goto reject; | |
1659 | } | |
1660 | ||
577577da MC |
1661 | task = iscsi_alloc_task(conn, sc); |
1662 | if (!task) { | |
60ecebf5 MC |
1663 | reason = FAILURE_OOM; |
1664 | goto reject; | |
1665 | } | |
7996a778 | 1666 | |
1336aed1 | 1667 | if (!ihost->workq) { |
577577da MC |
1668 | reason = iscsi_prep_scsi_cmd_pdu(task); |
1669 | if (reason) { | |
5d12c05e | 1670 | if (reason == -ENOMEM || reason == -EACCES) { |
577577da MC |
1671 | reason = FAILURE_OOM; |
1672 | goto prepd_reject; | |
1673 | } else { | |
1674 | sc->result = DID_ABORT << 16; | |
1675 | goto prepd_fault; | |
1676 | } | |
052d0144 | 1677 | } |
9c19a7d0 | 1678 | if (session->tt->xmit_task(task)) { |
d3305f34 | 1679 | session->cmdsn--; |
052d0144 | 1680 | reason = FAILURE_SESSION_NOT_READY; |
577577da | 1681 | goto prepd_reject; |
052d0144 | 1682 | } |
3bbaaad9 MC |
1683 | } else { |
1684 | list_add_tail(&task->running, &conn->cmdqueue); | |
32ae763e | 1685 | iscsi_conn_queue_work(conn); |
3bbaaad9 | 1686 | } |
052d0144 MC |
1687 | |
1688 | session->queued_cmdsn++; | |
f41d4721 | 1689 | spin_unlock_bh(&session->lock); |
7996a778 MC |
1690 | return 0; |
1691 | ||
577577da | 1692 | prepd_reject: |
f41d4721 | 1693 | iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ); |
7996a778 | 1694 | reject: |
f41d4721 | 1695 | spin_unlock_bh(&session->lock); |
1b2c7af8 MC |
1696 | ISCSI_DBG_SESSION(session, "cmd 0x%x rejected (%d)\n", |
1697 | sc->cmnd[0], reason); | |
d6d13ee1 | 1698 | return SCSI_MLQUEUE_TARGET_BUSY; |
7996a778 | 1699 | |
577577da | 1700 | prepd_fault: |
f41d4721 | 1701 | iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ); |
7996a778 | 1702 | fault: |
f41d4721 | 1703 | spin_unlock_bh(&session->lock); |
1b2c7af8 MC |
1704 | ISCSI_DBG_SESSION(session, "iscsi: cmd 0x%x is not queued (%d)\n", |
1705 | sc->cmnd[0], reason); | |
c07d4444 BH |
1706 | if (!scsi_bidi_cmnd(sc)) |
1707 | scsi_set_resid(sc, scsi_bufflen(sc)); | |
1708 | else { | |
1709 | scsi_out(sc)->resid = scsi_out(sc)->length; | |
1710 | scsi_in(sc)->resid = scsi_in(sc)->length; | |
1711 | } | |
f41d4721 | 1712 | sc->scsi_done(sc); |
7996a778 MC |
1713 | return 0; |
1714 | } | |
1715 | EXPORT_SYMBOL_GPL(iscsi_queuecommand); | |
1716 | ||
e881a172 | 1717 | int iscsi_change_queue_depth(struct scsi_device *sdev, int depth, int reason) |
7996a778 | 1718 | { |
1796e722 MC |
1719 | switch (reason) { |
1720 | case SCSI_QDEPTH_DEFAULT: | |
1721 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); | |
1722 | break; | |
1723 | case SCSI_QDEPTH_QFULL: | |
1724 | scsi_track_queue_full(sdev, depth); | |
1725 | break; | |
1726 | case SCSI_QDEPTH_RAMP_UP: | |
1727 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); | |
1728 | break; | |
1729 | default: | |
e881a172 | 1730 | return -EOPNOTSUPP; |
1796e722 | 1731 | } |
7996a778 MC |
1732 | return sdev->queue_depth; |
1733 | } | |
1734 | EXPORT_SYMBOL_GPL(iscsi_change_queue_depth); | |
1735 | ||
6b5d6c44 MC |
1736 | int iscsi_target_alloc(struct scsi_target *starget) |
1737 | { | |
1738 | struct iscsi_cls_session *cls_session = starget_to_session(starget); | |
1739 | struct iscsi_session *session = cls_session->dd_data; | |
1740 | ||
1741 | starget->can_queue = session->scsi_cmds_max; | |
1742 | return 0; | |
1743 | } | |
1744 | EXPORT_SYMBOL_GPL(iscsi_target_alloc); | |
1745 | ||
843c0a8a | 1746 | static void iscsi_tmf_timedout(unsigned long data) |
7996a778 | 1747 | { |
843c0a8a | 1748 | struct iscsi_conn *conn = (struct iscsi_conn *)data; |
7996a778 MC |
1749 | struct iscsi_session *session = conn->session; |
1750 | ||
1751 | spin_lock(&session->lock); | |
843c0a8a MC |
1752 | if (conn->tmf_state == TMF_QUEUED) { |
1753 | conn->tmf_state = TMF_TIMEDOUT; | |
bd2199d4 | 1754 | ISCSI_DBG_EH(session, "tmf timedout\n"); |
7996a778 MC |
1755 | /* unblock eh_abort() */ |
1756 | wake_up(&conn->ehwait); | |
1757 | } | |
1758 | spin_unlock(&session->lock); | |
1759 | } | |
1760 | ||
9c19a7d0 | 1761 | static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn, |
f6d5180c MC |
1762 | struct iscsi_tm *hdr, int age, |
1763 | int timeout) | |
7996a778 | 1764 | { |
7996a778 | 1765 | struct iscsi_session *session = conn->session; |
9c19a7d0 | 1766 | struct iscsi_task *task; |
7996a778 | 1767 | |
9c19a7d0 | 1768 | task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr, |
843c0a8a | 1769 | NULL, 0); |
9c19a7d0 | 1770 | if (!task) { |
6724add1 | 1771 | spin_unlock_bh(&session->lock); |
df4da5cd | 1772 | iscsi_conn_printk(KERN_ERR, conn, "Could not send TMF.\n"); |
7996a778 | 1773 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
843c0a8a | 1774 | spin_lock_bh(&session->lock); |
77a23c21 | 1775 | return -EPERM; |
7996a778 | 1776 | } |
843c0a8a | 1777 | conn->tmfcmd_pdus_cnt++; |
f6d5180c | 1778 | conn->tmf_timer.expires = timeout * HZ + jiffies; |
843c0a8a MC |
1779 | conn->tmf_timer.function = iscsi_tmf_timedout; |
1780 | conn->tmf_timer.data = (unsigned long)conn; | |
1781 | add_timer(&conn->tmf_timer); | |
bd2199d4 | 1782 | ISCSI_DBG_EH(session, "tmf set timeout\n"); |
7996a778 | 1783 | |
7996a778 | 1784 | spin_unlock_bh(&session->lock); |
6724add1 | 1785 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1786 | |
1787 | /* | |
1788 | * block eh thread until: | |
1789 | * | |
843c0a8a MC |
1790 | * 1) tmf response |
1791 | * 2) tmf timeout | |
7996a778 MC |
1792 | * 3) session is terminated or restarted or userspace has |
1793 | * given up on recovery | |
1794 | */ | |
843c0a8a | 1795 | wait_event_interruptible(conn->ehwait, age != session->age || |
7996a778 | 1796 | session->state != ISCSI_STATE_LOGGED_IN || |
843c0a8a | 1797 | conn->tmf_state != TMF_QUEUED); |
7996a778 MC |
1798 | if (signal_pending(current)) |
1799 | flush_signals(current); | |
843c0a8a MC |
1800 | del_timer_sync(&conn->tmf_timer); |
1801 | ||
6724add1 | 1802 | mutex_lock(&session->eh_mutex); |
77a23c21 | 1803 | spin_lock_bh(&session->lock); |
9c19a7d0 | 1804 | /* if the session drops it will clean up the task */ |
843c0a8a MC |
1805 | if (age != session->age || |
1806 | session->state != ISCSI_STATE_LOGGED_IN) | |
1807 | return -ENOTCONN; | |
7996a778 MC |
1808 | return 0; |
1809 | } | |
1810 | ||
843c0a8a MC |
1811 | /* |
1812 | * Fail commands. session lock held and recv side suspended and xmit | |
1813 | * thread flushed | |
1814 | */ | |
3bbaaad9 MC |
1815 | static void fail_scsi_tasks(struct iscsi_conn *conn, unsigned lun, |
1816 | int error) | |
843c0a8a | 1817 | { |
3bbaaad9 MC |
1818 | struct iscsi_task *task; |
1819 | int i; | |
843c0a8a | 1820 | |
3bbaaad9 MC |
1821 | for (i = 0; i < conn->session->cmds_max; i++) { |
1822 | task = conn->session->cmds[i]; | |
1823 | if (!task->sc || task->state == ISCSI_TASK_FREE) | |
1824 | continue; | |
843c0a8a | 1825 | |
3bbaaad9 MC |
1826 | if (lun != -1 && lun != task->sc->device->lun) |
1827 | continue; | |
843c0a8a | 1828 | |
3bbaaad9 MC |
1829 | ISCSI_DBG_SESSION(conn->session, |
1830 | "failing sc %p itt 0x%x state %d\n", | |
1831 | task->sc, task->itt, task->state); | |
b3cd5050 | 1832 | fail_scsi_task(task, error); |
843c0a8a MC |
1833 | } |
1834 | } | |
1835 | ||
661134ad MC |
1836 | /** |
1837 | * iscsi_suspend_queue - suspend iscsi_queuecommand | |
1838 | * @conn: iscsi conn to stop queueing IO on | |
1839 | * | |
1840 | * This grabs the session lock to make sure no one is in | |
1841 | * xmit_task/queuecommand, and then sets suspend to prevent | |
1842 | * new commands from being queued. This only needs to be called | |
1843 | * by offload drivers that need to sync a path like ep disconnect | |
1844 | * with the iscsi_queuecommand/xmit_task. To start IO again libiscsi | |
1845 | * will call iscsi_start_tx and iscsi_unblock_session when in FFP. | |
1846 | */ | |
1847 | void iscsi_suspend_queue(struct iscsi_conn *conn) | |
1848 | { | |
1849 | spin_lock_bh(&conn->session->lock); | |
1850 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
1851 | spin_unlock_bh(&conn->session->lock); | |
1852 | } | |
1853 | EXPORT_SYMBOL_GPL(iscsi_suspend_queue); | |
1854 | ||
1855 | /** | |
1856 | * iscsi_suspend_tx - suspend iscsi_data_xmit | |
1857 | * @conn: iscsi conn tp stop processing IO on. | |
1858 | * | |
1859 | * This function sets the suspend bit to prevent iscsi_data_xmit | |
1860 | * from sending new IO, and if work is queued on the xmit thread | |
1861 | * it will wait for it to be completed. | |
1862 | */ | |
b40977d9 | 1863 | void iscsi_suspend_tx(struct iscsi_conn *conn) |
6724add1 | 1864 | { |
32ae763e MC |
1865 | struct Scsi_Host *shost = conn->session->host; |
1866 | struct iscsi_host *ihost = shost_priv(shost); | |
1867 | ||
6724add1 | 1868 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); |
1336aed1 | 1869 | if (ihost->workq) |
32ae763e | 1870 | flush_workqueue(ihost->workq); |
6724add1 | 1871 | } |
b40977d9 | 1872 | EXPORT_SYMBOL_GPL(iscsi_suspend_tx); |
6724add1 MC |
1873 | |
1874 | static void iscsi_start_tx(struct iscsi_conn *conn) | |
1875 | { | |
1876 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
1336aed1 | 1877 | iscsi_conn_queue_work(conn); |
6724add1 MC |
1878 | } |
1879 | ||
4c48a829 MC |
1880 | /* |
1881 | * We want to make sure a ping is in flight. It has timed out. | |
1882 | * And we are not busy processing a pdu that is making | |
1883 | * progress but got started before the ping and is taking a while | |
1884 | * to complete so the ping is just stuck behind it in a queue. | |
1885 | */ | |
1886 | static int iscsi_has_ping_timed_out(struct iscsi_conn *conn) | |
1887 | { | |
1888 | if (conn->ping_task && | |
1889 | time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) + | |
1890 | (conn->ping_timeout * HZ), jiffies)) | |
1891 | return 1; | |
1892 | else | |
1893 | return 0; | |
1894 | } | |
1895 | ||
d355e57d | 1896 | static enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *sc) |
f6d5180c | 1897 | { |
d355e57d | 1898 | enum blk_eh_timer_return rc = BLK_EH_NOT_HANDLED; |
92ed4d69 | 1899 | struct iscsi_task *task = NULL, *running_task; |
f6d5180c MC |
1900 | struct iscsi_cls_session *cls_session; |
1901 | struct iscsi_session *session; | |
1902 | struct iscsi_conn *conn; | |
92ed4d69 | 1903 | int i; |
f6d5180c | 1904 | |
d355e57d | 1905 | cls_session = starget_to_session(scsi_target(sc->device)); |
75613521 | 1906 | session = cls_session->dd_data; |
f6d5180c | 1907 | |
bd2199d4 | 1908 | ISCSI_DBG_EH(session, "scsi cmd %p timedout\n", sc); |
f6d5180c MC |
1909 | |
1910 | spin_lock(&session->lock); | |
1911 | if (session->state != ISCSI_STATE_LOGGED_IN) { | |
1912 | /* | |
1913 | * We are probably in the middle of iscsi recovery so let | |
1914 | * that complete and handle the error. | |
1915 | */ | |
242f9dcb | 1916 | rc = BLK_EH_RESET_TIMER; |
f6d5180c MC |
1917 | goto done; |
1918 | } | |
1919 | ||
1920 | conn = session->leadconn; | |
1921 | if (!conn) { | |
1922 | /* In the middle of shuting down */ | |
242f9dcb | 1923 | rc = BLK_EH_RESET_TIMER; |
f6d5180c MC |
1924 | goto done; |
1925 | } | |
1926 | ||
d355e57d | 1927 | task = (struct iscsi_task *)sc->SCp.ptr; |
92ed4d69 MC |
1928 | if (!task) { |
1929 | /* | |
1930 | * Raced with completion. Just reset timer, and let it | |
1931 | * complete normally | |
1932 | */ | |
1933 | rc = BLK_EH_RESET_TIMER; | |
d355e57d | 1934 | goto done; |
92ed4d69 MC |
1935 | } |
1936 | ||
d355e57d MC |
1937 | /* |
1938 | * If we have sent (at least queued to the network layer) a pdu or | |
1939 | * recvd one for the task since the last timeout ask for | |
1940 | * more time. If on the next timeout we have not made progress | |
1941 | * we can check if it is the task or connection when we send the | |
1942 | * nop as a ping. | |
1943 | */ | |
92ed4d69 | 1944 | if (time_after(task->last_xfer, task->last_timeout)) { |
bd2199d4 EZ |
1945 | ISCSI_DBG_EH(session, "Command making progress. Asking " |
1946 | "scsi-ml for more time to complete. " | |
92ed4d69 | 1947 | "Last data xfer at %lu. Last timeout was at " |
bd2199d4 | 1948 | "%lu\n.", task->last_xfer, task->last_timeout); |
d355e57d MC |
1949 | task->have_checked_conn = false; |
1950 | rc = BLK_EH_RESET_TIMER; | |
1951 | goto done; | |
1952 | } | |
1953 | ||
f6d5180c MC |
1954 | if (!conn->recv_timeout && !conn->ping_timeout) |
1955 | goto done; | |
1956 | /* | |
1957 | * if the ping timedout then we are in the middle of cleaning up | |
1958 | * and can let the iscsi eh handle it | |
1959 | */ | |
4c48a829 | 1960 | if (iscsi_has_ping_timed_out(conn)) { |
242f9dcb | 1961 | rc = BLK_EH_RESET_TIMER; |
4c48a829 MC |
1962 | goto done; |
1963 | } | |
d355e57d | 1964 | |
92ed4d69 MC |
1965 | for (i = 0; i < conn->session->cmds_max; i++) { |
1966 | running_task = conn->session->cmds[i]; | |
1967 | if (!running_task->sc || running_task == task || | |
1968 | running_task->state != ISCSI_TASK_RUNNING) | |
1969 | continue; | |
1970 | ||
1971 | /* | |
1972 | * Only check if cmds started before this one have made | |
1973 | * progress, or this could never fail | |
1974 | */ | |
1975 | if (time_after(running_task->sc->jiffies_at_alloc, | |
1976 | task->sc->jiffies_at_alloc)) | |
1977 | continue; | |
1978 | ||
1979 | if (time_after(running_task->last_xfer, task->last_timeout)) { | |
1980 | /* | |
1981 | * This task has not made progress, but a task | |
1982 | * started before us has transferred data since | |
1983 | * we started/last-checked. We could be queueing | |
1984 | * too many tasks or the LU is bad. | |
1985 | * | |
1986 | * If the device is bad the cmds ahead of us on | |
1987 | * other devs will complete, and this loop will | |
1988 | * eventually fail starting the scsi eh. | |
1989 | */ | |
1990 | ISCSI_DBG_EH(session, "Command has not made progress " | |
1991 | "but commands ahead of it have. " | |
1992 | "Asking scsi-ml for more time to " | |
1993 | "complete. Our last xfer vs running task " | |
1994 | "last xfer %lu/%lu. Last check %lu.\n", | |
1995 | task->last_xfer, running_task->last_xfer, | |
1996 | task->last_timeout); | |
1997 | rc = BLK_EH_RESET_TIMER; | |
1998 | goto done; | |
1999 | } | |
2000 | } | |
2001 | ||
d355e57d MC |
2002 | /* Assumes nop timeout is shorter than scsi cmd timeout */ |
2003 | if (task->have_checked_conn) | |
2004 | goto done; | |
2005 | ||
f6d5180c | 2006 | /* |
d355e57d MC |
2007 | * Checking the transport already or nop from a cmd timeout still |
2008 | * running | |
f6d5180c | 2009 | */ |
d355e57d MC |
2010 | if (conn->ping_task) { |
2011 | task->have_checked_conn = true; | |
242f9dcb | 2012 | rc = BLK_EH_RESET_TIMER; |
4c48a829 MC |
2013 | goto done; |
2014 | } | |
2015 | ||
d355e57d MC |
2016 | /* Make sure there is a transport check done */ |
2017 | iscsi_send_nopout(conn, NULL); | |
2018 | task->have_checked_conn = true; | |
2019 | rc = BLK_EH_RESET_TIMER; | |
2020 | ||
f6d5180c | 2021 | done: |
d355e57d MC |
2022 | if (task) |
2023 | task->last_timeout = jiffies; | |
f6d5180c | 2024 | spin_unlock(&session->lock); |
bd2199d4 EZ |
2025 | ISCSI_DBG_EH(session, "return %s\n", rc == BLK_EH_RESET_TIMER ? |
2026 | "timer reset" : "nh"); | |
f6d5180c MC |
2027 | return rc; |
2028 | } | |
2029 | ||
2030 | static void iscsi_check_transport_timeouts(unsigned long data) | |
2031 | { | |
2032 | struct iscsi_conn *conn = (struct iscsi_conn *)data; | |
2033 | struct iscsi_session *session = conn->session; | |
4cf10435 | 2034 | unsigned long recv_timeout, next_timeout = 0, last_recv; |
f6d5180c MC |
2035 | |
2036 | spin_lock(&session->lock); | |
2037 | if (session->state != ISCSI_STATE_LOGGED_IN) | |
2038 | goto done; | |
2039 | ||
4cf10435 MC |
2040 | recv_timeout = conn->recv_timeout; |
2041 | if (!recv_timeout) | |
f6d5180c MC |
2042 | goto done; |
2043 | ||
4cf10435 | 2044 | recv_timeout *= HZ; |
f6d5180c | 2045 | last_recv = conn->last_recv; |
4c48a829 MC |
2046 | |
2047 | if (iscsi_has_ping_timed_out(conn)) { | |
322d739d | 2048 | iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs " |
4c48a829 MC |
2049 | "expired, recv timeout %d, last rx %lu, " |
2050 | "last ping %lu, now %lu\n", | |
2051 | conn->ping_timeout, conn->recv_timeout, | |
2052 | last_recv, conn->last_ping, jiffies); | |
f6d5180c MC |
2053 | spin_unlock(&session->lock); |
2054 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
2055 | return; | |
2056 | } | |
2057 | ||
4cf10435 | 2058 | if (time_before_eq(last_recv + recv_timeout, jiffies)) { |
c8611f97 | 2059 | /* send a ping to try to provoke some traffic */ |
1b2c7af8 | 2060 | ISCSI_DBG_CONN(conn, "Sending nopout as ping\n"); |
c8611f97 | 2061 | iscsi_send_nopout(conn, NULL); |
4cf10435 | 2062 | next_timeout = conn->last_ping + (conn->ping_timeout * HZ); |
ad294e9c | 2063 | } else |
4cf10435 | 2064 | next_timeout = last_recv + recv_timeout; |
f6d5180c | 2065 | |
1b2c7af8 | 2066 | ISCSI_DBG_CONN(conn, "Setting next tmo %lu\n", next_timeout); |
ad294e9c | 2067 | mod_timer(&conn->transport_timer, next_timeout); |
f6d5180c MC |
2068 | done: |
2069 | spin_unlock(&session->lock); | |
2070 | } | |
2071 | ||
9c19a7d0 | 2072 | static void iscsi_prep_abort_task_pdu(struct iscsi_task *task, |
843c0a8a MC |
2073 | struct iscsi_tm *hdr) |
2074 | { | |
2075 | memset(hdr, 0, sizeof(*hdr)); | |
2076 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
2077 | hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK; | |
2078 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
55bdabdf | 2079 | hdr->lun = task->lun; |
577577da MC |
2080 | hdr->rtt = task->hdr_itt; |
2081 | hdr->refcmdsn = task->cmdsn; | |
843c0a8a MC |
2082 | } |
2083 | ||
7996a778 MC |
2084 | int iscsi_eh_abort(struct scsi_cmnd *sc) |
2085 | { | |
75613521 MC |
2086 | struct iscsi_cls_session *cls_session; |
2087 | struct iscsi_session *session; | |
f47f2cf5 | 2088 | struct iscsi_conn *conn; |
9c19a7d0 | 2089 | struct iscsi_task *task; |
843c0a8a MC |
2090 | struct iscsi_tm *hdr; |
2091 | int rc, age; | |
7996a778 | 2092 | |
75613521 MC |
2093 | cls_session = starget_to_session(scsi_target(sc->device)); |
2094 | session = cls_session->dd_data; | |
2095 | ||
bd2199d4 | 2096 | ISCSI_DBG_EH(session, "aborting sc %p\n", sc); |
4421c9eb | 2097 | |
6724add1 MC |
2098 | mutex_lock(&session->eh_mutex); |
2099 | spin_lock_bh(&session->lock); | |
f47f2cf5 MC |
2100 | /* |
2101 | * if session was ISCSI_STATE_IN_RECOVERY then we may not have | |
2102 | * got the command. | |
2103 | */ | |
2104 | if (!sc->SCp.ptr) { | |
bd2199d4 EZ |
2105 | ISCSI_DBG_EH(session, "sc never reached iscsi layer or " |
2106 | "it completed.\n"); | |
6724add1 MC |
2107 | spin_unlock_bh(&session->lock); |
2108 | mutex_unlock(&session->eh_mutex); | |
f47f2cf5 MC |
2109 | return SUCCESS; |
2110 | } | |
2111 | ||
7996a778 MC |
2112 | /* |
2113 | * If we are not logged in or we have started a new session | |
2114 | * then let the host reset code handle this | |
2115 | */ | |
843c0a8a MC |
2116 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN || |
2117 | sc->SCp.phase != session->age) { | |
2118 | spin_unlock_bh(&session->lock); | |
2119 | mutex_unlock(&session->eh_mutex); | |
bd2199d4 | 2120 | ISCSI_DBG_EH(session, "failing abort due to dropped " |
4421c9eb | 2121 | "session.\n"); |
843c0a8a MC |
2122 | return FAILED; |
2123 | } | |
2124 | ||
2125 | conn = session->leadconn; | |
2126 | conn->eh_abort_cnt++; | |
2127 | age = session->age; | |
2128 | ||
9c19a7d0 | 2129 | task = (struct iscsi_task *)sc->SCp.ptr; |
bd2199d4 EZ |
2130 | ISCSI_DBG_EH(session, "aborting [sc %p itt 0x%x]\n", |
2131 | sc, task->itt); | |
7996a778 | 2132 | |
9c19a7d0 MC |
2133 | /* task completed before time out */ |
2134 | if (!task->sc) { | |
bd2199d4 | 2135 | ISCSI_DBG_EH(session, "sc completed while abort in progress\n"); |
77a23c21 | 2136 | goto success; |
7ea8b828 | 2137 | } |
7996a778 | 2138 | |
9c19a7d0 | 2139 | if (task->state == ISCSI_TASK_PENDING) { |
b3cd5050 | 2140 | fail_scsi_task(task, DID_ABORT); |
77a23c21 MC |
2141 | goto success; |
2142 | } | |
7996a778 | 2143 | |
843c0a8a MC |
2144 | /* only have one tmf outstanding at a time */ |
2145 | if (conn->tmf_state != TMF_INITIAL) | |
7996a778 | 2146 | goto failed; |
843c0a8a | 2147 | conn->tmf_state = TMF_QUEUED; |
7996a778 | 2148 | |
843c0a8a | 2149 | hdr = &conn->tmhdr; |
9c19a7d0 | 2150 | iscsi_prep_abort_task_pdu(task, hdr); |
843c0a8a | 2151 | |
9c19a7d0 | 2152 | if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout)) { |
843c0a8a MC |
2153 | rc = FAILED; |
2154 | goto failed; | |
2155 | } | |
2156 | ||
2157 | switch (conn->tmf_state) { | |
2158 | case TMF_SUCCESS: | |
77a23c21 | 2159 | spin_unlock_bh(&session->lock); |
913e5bf4 MC |
2160 | /* |
2161 | * stop tx side incase the target had sent a abort rsp but | |
2162 | * the initiator was still writing out data. | |
2163 | */ | |
6724add1 | 2164 | iscsi_suspend_tx(conn); |
77a23c21 | 2165 | /* |
913e5bf4 MC |
2166 | * we do not stop the recv side because targets have been |
2167 | * good and have never sent us a successful tmf response | |
2168 | * then sent more data for the cmd. | |
77a23c21 | 2169 | */ |
6187c242 | 2170 | spin_lock_bh(&session->lock); |
b3cd5050 | 2171 | fail_scsi_task(task, DID_ABORT); |
843c0a8a | 2172 | conn->tmf_state = TMF_INITIAL; |
5d12c05e | 2173 | memset(hdr, 0, sizeof(*hdr)); |
6187c242 | 2174 | spin_unlock_bh(&session->lock); |
6724add1 | 2175 | iscsi_start_tx(conn); |
77a23c21 | 2176 | goto success_unlocked; |
843c0a8a MC |
2177 | case TMF_TIMEDOUT: |
2178 | spin_unlock_bh(&session->lock); | |
df4da5cd | 2179 | iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); |
843c0a8a MC |
2180 | goto failed_unlocked; |
2181 | case TMF_NOT_FOUND: | |
2182 | if (!sc->SCp.ptr) { | |
2183 | conn->tmf_state = TMF_INITIAL; | |
5d12c05e | 2184 | memset(hdr, 0, sizeof(*hdr)); |
9c19a7d0 | 2185 | /* task completed before tmf abort response */ |
bd2199d4 EZ |
2186 | ISCSI_DBG_EH(session, "sc completed while abort in " |
2187 | "progress\n"); | |
77a23c21 | 2188 | goto success; |
7ea8b828 MC |
2189 | } |
2190 | /* fall through */ | |
2191 | default: | |
843c0a8a MC |
2192 | conn->tmf_state = TMF_INITIAL; |
2193 | goto failed; | |
7996a778 MC |
2194 | } |
2195 | ||
77a23c21 | 2196 | success: |
7996a778 | 2197 | spin_unlock_bh(&session->lock); |
77a23c21 | 2198 | success_unlocked: |
bd2199d4 EZ |
2199 | ISCSI_DBG_EH(session, "abort success [sc %p itt 0x%x]\n", |
2200 | sc, task->itt); | |
6724add1 | 2201 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
2202 | return SUCCESS; |
2203 | ||
2204 | failed: | |
2205 | spin_unlock_bh(&session->lock); | |
77a23c21 | 2206 | failed_unlocked: |
bd2199d4 EZ |
2207 | ISCSI_DBG_EH(session, "abort failed [sc %p itt 0x%x]\n", sc, |
2208 | task ? task->itt : 0); | |
6724add1 | 2209 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
2210 | return FAILED; |
2211 | } | |
2212 | EXPORT_SYMBOL_GPL(iscsi_eh_abort); | |
2213 | ||
843c0a8a MC |
2214 | static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr) |
2215 | { | |
2216 | memset(hdr, 0, sizeof(*hdr)); | |
2217 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
2218 | hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK; | |
2219 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
55bdabdf | 2220 | int_to_scsilun(sc->device->lun, &hdr->lun); |
f6d5180c | 2221 | hdr->rtt = RESERVED_ITT; |
843c0a8a MC |
2222 | } |
2223 | ||
2224 | int iscsi_eh_device_reset(struct scsi_cmnd *sc) | |
2225 | { | |
75613521 MC |
2226 | struct iscsi_cls_session *cls_session; |
2227 | struct iscsi_session *session; | |
843c0a8a MC |
2228 | struct iscsi_conn *conn; |
2229 | struct iscsi_tm *hdr; | |
2230 | int rc = FAILED; | |
2231 | ||
75613521 MC |
2232 | cls_session = starget_to_session(scsi_target(sc->device)); |
2233 | session = cls_session->dd_data; | |
2234 | ||
bd2199d4 | 2235 | ISCSI_DBG_EH(session, "LU Reset [sc %p lun %u]\n", sc, sc->device->lun); |
843c0a8a MC |
2236 | |
2237 | mutex_lock(&session->eh_mutex); | |
2238 | spin_lock_bh(&session->lock); | |
2239 | /* | |
2240 | * Just check if we are not logged in. We cannot check for | |
2241 | * the phase because the reset could come from a ioctl. | |
2242 | */ | |
2243 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN) | |
2244 | goto unlock; | |
2245 | conn = session->leadconn; | |
2246 | ||
2247 | /* only have one tmf outstanding at a time */ | |
2248 | if (conn->tmf_state != TMF_INITIAL) | |
2249 | goto unlock; | |
2250 | conn->tmf_state = TMF_QUEUED; | |
2251 | ||
2252 | hdr = &conn->tmhdr; | |
2253 | iscsi_prep_lun_reset_pdu(sc, hdr); | |
2254 | ||
9c19a7d0 | 2255 | if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age, |
f6d5180c | 2256 | session->lu_reset_timeout)) { |
843c0a8a MC |
2257 | rc = FAILED; |
2258 | goto unlock; | |
2259 | } | |
2260 | ||
2261 | switch (conn->tmf_state) { | |
2262 | case TMF_SUCCESS: | |
2263 | break; | |
2264 | case TMF_TIMEDOUT: | |
2265 | spin_unlock_bh(&session->lock); | |
df4da5cd | 2266 | iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); |
843c0a8a MC |
2267 | goto done; |
2268 | default: | |
2269 | conn->tmf_state = TMF_INITIAL; | |
2270 | goto unlock; | |
2271 | } | |
2272 | ||
2273 | rc = SUCCESS; | |
2274 | spin_unlock_bh(&session->lock); | |
2275 | ||
2276 | iscsi_suspend_tx(conn); | |
913e5bf4 | 2277 | |
a3439148 | 2278 | spin_lock_bh(&session->lock); |
5d12c05e | 2279 | memset(hdr, 0, sizeof(*hdr)); |
3bbaaad9 | 2280 | fail_scsi_tasks(conn, sc->device->lun, DID_ERROR); |
843c0a8a | 2281 | conn->tmf_state = TMF_INITIAL; |
a3439148 | 2282 | spin_unlock_bh(&session->lock); |
843c0a8a MC |
2283 | |
2284 | iscsi_start_tx(conn); | |
2285 | goto done; | |
2286 | ||
2287 | unlock: | |
2288 | spin_unlock_bh(&session->lock); | |
2289 | done: | |
bd2199d4 EZ |
2290 | ISCSI_DBG_EH(session, "dev reset result = %s\n", |
2291 | rc == SUCCESS ? "SUCCESS" : "FAILED"); | |
843c0a8a MC |
2292 | mutex_unlock(&session->eh_mutex); |
2293 | return rc; | |
2294 | } | |
2295 | EXPORT_SYMBOL_GPL(iscsi_eh_device_reset); | |
2296 | ||
3fe5ae8b MC |
2297 | void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session) |
2298 | { | |
2299 | struct iscsi_session *session = cls_session->dd_data; | |
2300 | ||
2301 | spin_lock_bh(&session->lock); | |
2302 | if (session->state != ISCSI_STATE_LOGGED_IN) { | |
2303 | session->state = ISCSI_STATE_RECOVERY_FAILED; | |
2304 | if (session->leadconn) | |
2305 | wake_up(&session->leadconn->ehwait); | |
2306 | } | |
2307 | spin_unlock_bh(&session->lock); | |
2308 | } | |
2309 | EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout); | |
2310 | ||
2311 | /** | |
2312 | * iscsi_eh_session_reset - drop session and attempt relogin | |
2313 | * @sc: scsi command | |
2314 | * | |
2315 | * This function will wait for a relogin, session termination from | |
2316 | * userspace, or a recovery/replacement timeout. | |
2317 | */ | |
309ce156 | 2318 | int iscsi_eh_session_reset(struct scsi_cmnd *sc) |
3fe5ae8b MC |
2319 | { |
2320 | struct iscsi_cls_session *cls_session; | |
2321 | struct iscsi_session *session; | |
2322 | struct iscsi_conn *conn; | |
2323 | ||
2324 | cls_session = starget_to_session(scsi_target(sc->device)); | |
2325 | session = cls_session->dd_data; | |
2326 | conn = session->leadconn; | |
2327 | ||
2328 | mutex_lock(&session->eh_mutex); | |
2329 | spin_lock_bh(&session->lock); | |
2330 | if (session->state == ISCSI_STATE_TERMINATE) { | |
2331 | failed: | |
2332 | ISCSI_DBG_EH(session, | |
2333 | "failing session reset: Could not log back into " | |
2334 | "%s, %s [age %d]\n", session->targetname, | |
2335 | conn->persistent_address, session->age); | |
2336 | spin_unlock_bh(&session->lock); | |
2337 | mutex_unlock(&session->eh_mutex); | |
2338 | return FAILED; | |
2339 | } | |
2340 | ||
2341 | spin_unlock_bh(&session->lock); | |
2342 | mutex_unlock(&session->eh_mutex); | |
2343 | /* | |
2344 | * we drop the lock here but the leadconn cannot be destoyed while | |
2345 | * we are in the scsi eh | |
2346 | */ | |
df4da5cd | 2347 | iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); |
3fe5ae8b MC |
2348 | |
2349 | ISCSI_DBG_EH(session, "wait for relogin\n"); | |
2350 | wait_event_interruptible(conn->ehwait, | |
2351 | session->state == ISCSI_STATE_TERMINATE || | |
2352 | session->state == ISCSI_STATE_LOGGED_IN || | |
2353 | session->state == ISCSI_STATE_RECOVERY_FAILED); | |
2354 | if (signal_pending(current)) | |
2355 | flush_signals(current); | |
2356 | ||
2357 | mutex_lock(&session->eh_mutex); | |
2358 | spin_lock_bh(&session->lock); | |
2359 | if (session->state == ISCSI_STATE_LOGGED_IN) { | |
2360 | ISCSI_DBG_EH(session, | |
2361 | "session reset succeeded for %s,%s\n", | |
2362 | session->targetname, conn->persistent_address); | |
2363 | } else | |
2364 | goto failed; | |
2365 | spin_unlock_bh(&session->lock); | |
2366 | mutex_unlock(&session->eh_mutex); | |
2367 | return SUCCESS; | |
2368 | } | |
309ce156 | 2369 | EXPORT_SYMBOL_GPL(iscsi_eh_session_reset); |
3fe5ae8b MC |
2370 | |
2371 | static void iscsi_prep_tgt_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr) | |
2372 | { | |
2373 | memset(hdr, 0, sizeof(*hdr)); | |
2374 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
2375 | hdr->flags = ISCSI_TM_FUNC_TARGET_WARM_RESET & ISCSI_FLAG_TM_FUNC_MASK; | |
2376 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
2377 | hdr->rtt = RESERVED_ITT; | |
2378 | } | |
2379 | ||
2380 | /** | |
2381 | * iscsi_eh_target_reset - reset target | |
2382 | * @sc: scsi command | |
2383 | * | |
309ce156 | 2384 | * This will attempt to send a warm target reset. |
3fe5ae8b MC |
2385 | */ |
2386 | int iscsi_eh_target_reset(struct scsi_cmnd *sc) | |
2387 | { | |
2388 | struct iscsi_cls_session *cls_session; | |
2389 | struct iscsi_session *session; | |
2390 | struct iscsi_conn *conn; | |
2391 | struct iscsi_tm *hdr; | |
2392 | int rc = FAILED; | |
2393 | ||
2394 | cls_session = starget_to_session(scsi_target(sc->device)); | |
2395 | session = cls_session->dd_data; | |
2396 | ||
2397 | ISCSI_DBG_EH(session, "tgt Reset [sc %p tgt %s]\n", sc, | |
2398 | session->targetname); | |
2399 | ||
2400 | mutex_lock(&session->eh_mutex); | |
2401 | spin_lock_bh(&session->lock); | |
2402 | /* | |
2403 | * Just check if we are not logged in. We cannot check for | |
2404 | * the phase because the reset could come from a ioctl. | |
2405 | */ | |
2406 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN) | |
2407 | goto unlock; | |
2408 | conn = session->leadconn; | |
2409 | ||
2410 | /* only have one tmf outstanding at a time */ | |
2411 | if (conn->tmf_state != TMF_INITIAL) | |
2412 | goto unlock; | |
2413 | conn->tmf_state = TMF_QUEUED; | |
2414 | ||
2415 | hdr = &conn->tmhdr; | |
2416 | iscsi_prep_tgt_reset_pdu(sc, hdr); | |
2417 | ||
2418 | if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age, | |
2419 | session->tgt_reset_timeout)) { | |
2420 | rc = FAILED; | |
2421 | goto unlock; | |
2422 | } | |
2423 | ||
2424 | switch (conn->tmf_state) { | |
2425 | case TMF_SUCCESS: | |
2426 | break; | |
2427 | case TMF_TIMEDOUT: | |
2428 | spin_unlock_bh(&session->lock); | |
df4da5cd | 2429 | iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); |
3fe5ae8b MC |
2430 | goto done; |
2431 | default: | |
2432 | conn->tmf_state = TMF_INITIAL; | |
2433 | goto unlock; | |
2434 | } | |
2435 | ||
2436 | rc = SUCCESS; | |
2437 | spin_unlock_bh(&session->lock); | |
2438 | ||
2439 | iscsi_suspend_tx(conn); | |
2440 | ||
2441 | spin_lock_bh(&session->lock); | |
2442 | memset(hdr, 0, sizeof(*hdr)); | |
2443 | fail_scsi_tasks(conn, -1, DID_ERROR); | |
2444 | conn->tmf_state = TMF_INITIAL; | |
2445 | spin_unlock_bh(&session->lock); | |
2446 | ||
2447 | iscsi_start_tx(conn); | |
2448 | goto done; | |
2449 | ||
2450 | unlock: | |
2451 | spin_unlock_bh(&session->lock); | |
2452 | done: | |
2453 | ISCSI_DBG_EH(session, "tgt %s reset result = %s\n", session->targetname, | |
2454 | rc == SUCCESS ? "SUCCESS" : "FAILED"); | |
2455 | mutex_unlock(&session->eh_mutex); | |
309ce156 JK |
2456 | return rc; |
2457 | } | |
2458 | EXPORT_SYMBOL_GPL(iscsi_eh_target_reset); | |
3fe5ae8b | 2459 | |
309ce156 JK |
2460 | /** |
2461 | * iscsi_eh_recover_target - reset target and possibly the session | |
2462 | * @sc: scsi command | |
2463 | * | |
2464 | * This will attempt to send a warm target reset. If that fails, | |
2465 | * we will escalate to ERL0 session recovery. | |
2466 | */ | |
2467 | int iscsi_eh_recover_target(struct scsi_cmnd *sc) | |
2468 | { | |
2469 | int rc; | |
2470 | ||
2471 | rc = iscsi_eh_target_reset(sc); | |
3fe5ae8b MC |
2472 | if (rc == FAILED) |
2473 | rc = iscsi_eh_session_reset(sc); | |
2474 | return rc; | |
2475 | } | |
309ce156 | 2476 | EXPORT_SYMBOL_GPL(iscsi_eh_recover_target); |
3fe5ae8b | 2477 | |
6320377f OK |
2478 | /* |
2479 | * Pre-allocate a pool of @max items of @item_size. By default, the pool | |
2480 | * should be accessed via kfifo_{get,put} on q->queue. | |
2481 | * Optionally, the caller can obtain the array of object pointers | |
2482 | * by passing in a non-NULL @items pointer | |
2483 | */ | |
7996a778 | 2484 | int |
6320377f | 2485 | iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size) |
7996a778 | 2486 | { |
6320377f | 2487 | int i, num_arrays = 1; |
7996a778 | 2488 | |
6320377f | 2489 | memset(q, 0, sizeof(*q)); |
7996a778 MC |
2490 | |
2491 | q->max = max; | |
6320377f OK |
2492 | |
2493 | /* If the user passed an items pointer, he wants a copy of | |
2494 | * the array. */ | |
2495 | if (items) | |
2496 | num_arrays++; | |
2497 | q->pool = kzalloc(num_arrays * max * sizeof(void*), GFP_KERNEL); | |
2498 | if (q->pool == NULL) | |
f474a37b | 2499 | return -ENOMEM; |
7996a778 | 2500 | |
c1e13f25 | 2501 | kfifo_init(&q->queue, (void*)q->pool, max * sizeof(void*)); |
7996a778 MC |
2502 | |
2503 | for (i = 0; i < max; i++) { | |
6320377f | 2504 | q->pool[i] = kzalloc(item_size, GFP_KERNEL); |
7996a778 | 2505 | if (q->pool[i] == NULL) { |
6320377f OK |
2506 | q->max = i; |
2507 | goto enomem; | |
7996a778 | 2508 | } |
7acd72eb | 2509 | kfifo_in(&q->queue, (void*)&q->pool[i], sizeof(void*)); |
7996a778 | 2510 | } |
6320377f OK |
2511 | |
2512 | if (items) { | |
2513 | *items = q->pool + max; | |
2514 | memcpy(*items, q->pool, max * sizeof(void *)); | |
2515 | } | |
2516 | ||
7996a778 | 2517 | return 0; |
6320377f OK |
2518 | |
2519 | enomem: | |
2520 | iscsi_pool_free(q); | |
2521 | return -ENOMEM; | |
7996a778 MC |
2522 | } |
2523 | EXPORT_SYMBOL_GPL(iscsi_pool_init); | |
2524 | ||
6320377f | 2525 | void iscsi_pool_free(struct iscsi_pool *q) |
7996a778 MC |
2526 | { |
2527 | int i; | |
2528 | ||
2529 | for (i = 0; i < q->max; i++) | |
6320377f | 2530 | kfree(q->pool[i]); |
f474a37b | 2531 | kfree(q->pool); |
7996a778 MC |
2532 | } |
2533 | EXPORT_SYMBOL_GPL(iscsi_pool_free); | |
2534 | ||
a4804cd6 MC |
2535 | /** |
2536 | * iscsi_host_add - add host to system | |
2537 | * @shost: scsi host | |
2538 | * @pdev: parent device | |
2539 | * | |
2540 | * This should be called by partial offload and software iscsi drivers | |
2541 | * to add a host to the system. | |
2542 | */ | |
2543 | int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev) | |
2544 | { | |
8e9a20ce MC |
2545 | if (!shost->can_queue) |
2546 | shost->can_queue = ISCSI_DEF_XMIT_CMDS_MAX; | |
2547 | ||
4d108350 MC |
2548 | if (!shost->cmd_per_lun) |
2549 | shost->cmd_per_lun = ISCSI_DEF_CMD_PER_LUN; | |
2550 | ||
308cec14 MC |
2551 | if (!shost->transportt->eh_timed_out) |
2552 | shost->transportt->eh_timed_out = iscsi_eh_cmd_timed_out; | |
a4804cd6 MC |
2553 | return scsi_add_host(shost, pdev); |
2554 | } | |
2555 | EXPORT_SYMBOL_GPL(iscsi_host_add); | |
2556 | ||
2557 | /** | |
2558 | * iscsi_host_alloc - allocate a host and driver data | |
2559 | * @sht: scsi host template | |
2560 | * @dd_data_size: driver host data size | |
32ae763e | 2561 | * @xmit_can_sleep: bool indicating if LLD will queue IO from a work queue |
a4804cd6 MC |
2562 | * |
2563 | * This should be called by partial offload and software iscsi drivers. | |
2564 | * To access the driver specific memory use the iscsi_host_priv() macro. | |
2565 | */ | |
2566 | struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht, | |
4d108350 | 2567 | int dd_data_size, bool xmit_can_sleep) |
75613521 | 2568 | { |
a4804cd6 | 2569 | struct Scsi_Host *shost; |
e5bd7b54 | 2570 | struct iscsi_host *ihost; |
a4804cd6 MC |
2571 | |
2572 | shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size); | |
2573 | if (!shost) | |
2574 | return NULL; | |
e5bd7b54 | 2575 | ihost = shost_priv(shost); |
32ae763e MC |
2576 | |
2577 | if (xmit_can_sleep) { | |
2578 | snprintf(ihost->workq_name, sizeof(ihost->workq_name), | |
2579 | "iscsi_q_%d", shost->host_no); | |
2580 | ihost->workq = create_singlethread_workqueue(ihost->workq_name); | |
2581 | if (!ihost->workq) | |
2582 | goto free_host; | |
2583 | } | |
2584 | ||
e5bd7b54 MC |
2585 | spin_lock_init(&ihost->lock); |
2586 | ihost->state = ISCSI_HOST_SETUP; | |
2587 | ihost->num_sessions = 0; | |
2588 | init_waitqueue_head(&ihost->session_removal_wq); | |
a4804cd6 | 2589 | return shost; |
32ae763e MC |
2590 | |
2591 | free_host: | |
2592 | scsi_host_put(shost); | |
2593 | return NULL; | |
a4804cd6 MC |
2594 | } |
2595 | EXPORT_SYMBOL_GPL(iscsi_host_alloc); | |
2596 | ||
e5bd7b54 MC |
2597 | static void iscsi_notify_host_removed(struct iscsi_cls_session *cls_session) |
2598 | { | |
40a06e75 | 2599 | iscsi_session_failure(cls_session->dd_data, ISCSI_ERR_INVALID_HOST); |
e5bd7b54 MC |
2600 | } |
2601 | ||
a4804cd6 MC |
2602 | /** |
2603 | * iscsi_host_remove - remove host and sessions | |
2604 | * @shost: scsi host | |
2605 | * | |
e5bd7b54 MC |
2606 | * If there are any sessions left, this will initiate the removal and wait |
2607 | * for the completion. | |
a4804cd6 MC |
2608 | */ |
2609 | void iscsi_host_remove(struct Scsi_Host *shost) | |
2610 | { | |
e5bd7b54 MC |
2611 | struct iscsi_host *ihost = shost_priv(shost); |
2612 | unsigned long flags; | |
2613 | ||
2614 | spin_lock_irqsave(&ihost->lock, flags); | |
2615 | ihost->state = ISCSI_HOST_REMOVED; | |
2616 | spin_unlock_irqrestore(&ihost->lock, flags); | |
2617 | ||
2618 | iscsi_host_for_each_session(shost, iscsi_notify_host_removed); | |
2619 | wait_event_interruptible(ihost->session_removal_wq, | |
2620 | ihost->num_sessions == 0); | |
2621 | if (signal_pending(current)) | |
2622 | flush_signals(current); | |
2623 | ||
a4804cd6 | 2624 | scsi_remove_host(shost); |
32ae763e MC |
2625 | if (ihost->workq) |
2626 | destroy_workqueue(ihost->workq); | |
75613521 | 2627 | } |
a4804cd6 | 2628 | EXPORT_SYMBOL_GPL(iscsi_host_remove); |
7996a778 | 2629 | |
a4804cd6 | 2630 | void iscsi_host_free(struct Scsi_Host *shost) |
75613521 MC |
2631 | { |
2632 | struct iscsi_host *ihost = shost_priv(shost); | |
7996a778 | 2633 | |
75613521 MC |
2634 | kfree(ihost->netdev); |
2635 | kfree(ihost->hwaddress); | |
2636 | kfree(ihost->initiatorname); | |
a4804cd6 | 2637 | scsi_host_put(shost); |
75613521 | 2638 | } |
a4804cd6 | 2639 | EXPORT_SYMBOL_GPL(iscsi_host_free); |
7996a778 | 2640 | |
e5bd7b54 MC |
2641 | static void iscsi_host_dec_session_cnt(struct Scsi_Host *shost) |
2642 | { | |
2643 | struct iscsi_host *ihost = shost_priv(shost); | |
2644 | unsigned long flags; | |
2645 | ||
2646 | shost = scsi_host_get(shost); | |
2647 | if (!shost) { | |
2648 | printk(KERN_ERR "Invalid state. Cannot notify host removal " | |
2649 | "of session teardown event because host already " | |
2650 | "removed.\n"); | |
2651 | return; | |
2652 | } | |
2653 | ||
2654 | spin_lock_irqsave(&ihost->lock, flags); | |
2655 | ihost->num_sessions--; | |
2656 | if (ihost->num_sessions == 0) | |
2657 | wake_up(&ihost->session_removal_wq); | |
2658 | spin_unlock_irqrestore(&ihost->lock, flags); | |
2659 | scsi_host_put(shost); | |
2660 | } | |
2661 | ||
7996a778 MC |
2662 | /** |
2663 | * iscsi_session_setup - create iscsi cls session and host and session | |
7996a778 | 2664 | * @iscsit: iscsi transport template |
75613521 MC |
2665 | * @shost: scsi host |
2666 | * @cmds_max: session can queue | |
9c19a7d0 | 2667 | * @cmd_task_size: LLD task private data size |
7996a778 | 2668 | * @initial_cmdsn: initial CmdSN |
7996a778 MC |
2669 | * |
2670 | * This can be used by software iscsi_transports that allocate | |
2671 | * a session per scsi host. | |
3cf7b233 MC |
2672 | * |
2673 | * Callers should set cmds_max to the largest total numer (mgmt + scsi) of | |
2674 | * tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks | |
2675 | * for nop handling and login/logout requests. | |
75613521 | 2676 | */ |
7996a778 | 2677 | struct iscsi_cls_session * |
75613521 | 2678 | iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost, |
b8b9e1b8 | 2679 | uint16_t cmds_max, int dd_size, int cmd_task_size, |
7970634b | 2680 | uint32_t initial_cmdsn, unsigned int id) |
7996a778 | 2681 | { |
e5bd7b54 | 2682 | struct iscsi_host *ihost = shost_priv(shost); |
7996a778 MC |
2683 | struct iscsi_session *session; |
2684 | struct iscsi_cls_session *cls_session; | |
3cf7b233 | 2685 | int cmd_i, scsi_cmds, total_cmds = cmds_max; |
e5bd7b54 MC |
2686 | unsigned long flags; |
2687 | ||
2688 | spin_lock_irqsave(&ihost->lock, flags); | |
2689 | if (ihost->state == ISCSI_HOST_REMOVED) { | |
2690 | spin_unlock_irqrestore(&ihost->lock, flags); | |
2691 | return NULL; | |
2692 | } | |
2693 | ihost->num_sessions++; | |
2694 | spin_unlock_irqrestore(&ihost->lock, flags); | |
8e9a20ce MC |
2695 | |
2696 | if (!total_cmds) | |
2697 | total_cmds = ISCSI_DEF_XMIT_CMDS_MAX; | |
3e5c28ad | 2698 | /* |
3cf7b233 MC |
2699 | * The iscsi layer needs some tasks for nop handling and tmfs, |
2700 | * so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX | |
2701 | * + 1 command for scsi IO. | |
3e5c28ad | 2702 | */ |
3cf7b233 MC |
2703 | if (total_cmds < ISCSI_TOTAL_CMDS_MIN) { |
2704 | printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " | |
2705 | "must be a power of two that is at least %d.\n", | |
2706 | total_cmds, ISCSI_TOTAL_CMDS_MIN); | |
e5bd7b54 | 2707 | goto dec_session_count; |
3cf7b233 MC |
2708 | } |
2709 | ||
2710 | if (total_cmds > ISCSI_TOTAL_CMDS_MAX) { | |
2711 | printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " | |
2712 | "must be a power of 2 less than or equal to %d.\n", | |
2713 | cmds_max, ISCSI_TOTAL_CMDS_MAX); | |
2714 | total_cmds = ISCSI_TOTAL_CMDS_MAX; | |
2715 | } | |
2716 | ||
2717 | if (!is_power_of_2(total_cmds)) { | |
2718 | printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " | |
2719 | "must be a power of 2.\n", total_cmds); | |
2720 | total_cmds = rounddown_pow_of_two(total_cmds); | |
2721 | if (total_cmds < ISCSI_TOTAL_CMDS_MIN) | |
2722 | return NULL; | |
2723 | printk(KERN_INFO "iscsi: Rounding can_queue to %d.\n", | |
2724 | total_cmds); | |
1548271e | 2725 | } |
3cf7b233 | 2726 | scsi_cmds = total_cmds - ISCSI_MGMT_CMDS_MAX; |
1548271e | 2727 | |
5d91e209 | 2728 | cls_session = iscsi_alloc_session(shost, iscsit, |
b8b9e1b8 JK |
2729 | sizeof(struct iscsi_session) + |
2730 | dd_size); | |
75613521 | 2731 | if (!cls_session) |
e5bd7b54 | 2732 | goto dec_session_count; |
75613521 MC |
2733 | session = cls_session->dd_data; |
2734 | session->cls_session = cls_session; | |
7996a778 MC |
2735 | session->host = shost; |
2736 | session->state = ISCSI_STATE_FREE; | |
f6d5180c | 2737 | session->fast_abort = 1; |
3fe5ae8b | 2738 | session->tgt_reset_timeout = 30; |
4cd49ea1 MC |
2739 | session->lu_reset_timeout = 15; |
2740 | session->abort_timeout = 10; | |
3cf7b233 MC |
2741 | session->scsi_cmds_max = scsi_cmds; |
2742 | session->cmds_max = total_cmds; | |
e0726407 | 2743 | session->queued_cmdsn = session->cmdsn = initial_cmdsn; |
7996a778 MC |
2744 | session->exp_cmdsn = initial_cmdsn + 1; |
2745 | session->max_cmdsn = initial_cmdsn + 1; | |
2746 | session->max_r2t = 1; | |
2747 | session->tt = iscsit; | |
b8b9e1b8 | 2748 | session->dd_data = cls_session->dd_data + sizeof(*session); |
6724add1 | 2749 | mutex_init(&session->eh_mutex); |
75613521 | 2750 | spin_lock_init(&session->lock); |
7996a778 MC |
2751 | |
2752 | /* initialize SCSI PDU commands pool */ | |
2753 | if (iscsi_pool_init(&session->cmdpool, session->cmds_max, | |
2754 | (void***)&session->cmds, | |
9c19a7d0 | 2755 | cmd_task_size + sizeof(struct iscsi_task))) |
7996a778 MC |
2756 | goto cmdpool_alloc_fail; |
2757 | ||
2758 | /* pre-format cmds pool with ITT */ | |
2759 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
9c19a7d0 | 2760 | struct iscsi_task *task = session->cmds[cmd_i]; |
7996a778 | 2761 | |
9c19a7d0 MC |
2762 | if (cmd_task_size) |
2763 | task->dd_data = &task[1]; | |
2764 | task->itt = cmd_i; | |
3bbaaad9 | 2765 | task->state = ISCSI_TASK_FREE; |
9c19a7d0 | 2766 | INIT_LIST_HEAD(&task->running); |
7996a778 MC |
2767 | } |
2768 | ||
f53a88da | 2769 | if (!try_module_get(iscsit->owner)) |
75613521 | 2770 | goto module_get_fail; |
7996a778 | 2771 | |
7970634b | 2772 | if (iscsi_add_session(cls_session, id)) |
75613521 | 2773 | goto cls_session_fail; |
e5bd7b54 | 2774 | |
7996a778 MC |
2775 | return cls_session; |
2776 | ||
2777 | cls_session_fail: | |
75613521 MC |
2778 | module_put(iscsit->owner); |
2779 | module_get_fail: | |
6320377f | 2780 | iscsi_pool_free(&session->cmdpool); |
7996a778 | 2781 | cmdpool_alloc_fail: |
75613521 | 2782 | iscsi_free_session(cls_session); |
e5bd7b54 MC |
2783 | dec_session_count: |
2784 | iscsi_host_dec_session_cnt(shost); | |
7996a778 MC |
2785 | return NULL; |
2786 | } | |
2787 | EXPORT_SYMBOL_GPL(iscsi_session_setup); | |
2788 | ||
2789 | /** | |
2790 | * iscsi_session_teardown - destroy session, host, and cls_session | |
75613521 | 2791 | * @cls_session: iscsi session |
7996a778 | 2792 | * |
75613521 MC |
2793 | * The driver must have called iscsi_remove_session before |
2794 | * calling this. | |
2795 | */ | |
7996a778 MC |
2796 | void iscsi_session_teardown(struct iscsi_cls_session *cls_session) |
2797 | { | |
75613521 | 2798 | struct iscsi_session *session = cls_session->dd_data; |
63f75cc8 | 2799 | struct module *owner = cls_session->transport->owner; |
e5bd7b54 | 2800 | struct Scsi_Host *shost = session->host; |
7996a778 | 2801 | |
6320377f | 2802 | iscsi_pool_free(&session->cmdpool); |
7996a778 | 2803 | |
b2c64167 MC |
2804 | kfree(session->password); |
2805 | kfree(session->password_in); | |
2806 | kfree(session->username); | |
2807 | kfree(session->username_in); | |
f3ff0c36 | 2808 | kfree(session->targetname); |
88dfd340 MC |
2809 | kfree(session->initiatorname); |
2810 | kfree(session->ifacename); | |
f3ff0c36 | 2811 | |
75613521 | 2812 | iscsi_destroy_session(cls_session); |
e5bd7b54 | 2813 | iscsi_host_dec_session_cnt(shost); |
63f75cc8 | 2814 | module_put(owner); |
7996a778 MC |
2815 | } |
2816 | EXPORT_SYMBOL_GPL(iscsi_session_teardown); | |
2817 | ||
2818 | /** | |
2819 | * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn | |
2820 | * @cls_session: iscsi_cls_session | |
5d91e209 | 2821 | * @dd_size: private driver data size |
7996a778 | 2822 | * @conn_idx: cid |
5d91e209 | 2823 | */ |
7996a778 | 2824 | struct iscsi_cls_conn * |
5d91e209 MC |
2825 | iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size, |
2826 | uint32_t conn_idx) | |
7996a778 | 2827 | { |
75613521 | 2828 | struct iscsi_session *session = cls_session->dd_data; |
7996a778 MC |
2829 | struct iscsi_conn *conn; |
2830 | struct iscsi_cls_conn *cls_conn; | |
d36ab6f3 | 2831 | char *data; |
7996a778 | 2832 | |
5d91e209 MC |
2833 | cls_conn = iscsi_create_conn(cls_session, sizeof(*conn) + dd_size, |
2834 | conn_idx); | |
7996a778 MC |
2835 | if (!cls_conn) |
2836 | return NULL; | |
2837 | conn = cls_conn->dd_data; | |
5d91e209 | 2838 | memset(conn, 0, sizeof(*conn) + dd_size); |
7996a778 | 2839 | |
5d91e209 | 2840 | conn->dd_data = cls_conn->dd_data + sizeof(*conn); |
7996a778 MC |
2841 | conn->session = session; |
2842 | conn->cls_conn = cls_conn; | |
2843 | conn->c_stage = ISCSI_CONN_INITIAL_STAGE; | |
2844 | conn->id = conn_idx; | |
2845 | conn->exp_statsn = 0; | |
843c0a8a | 2846 | conn->tmf_state = TMF_INITIAL; |
f6d5180c MC |
2847 | |
2848 | init_timer(&conn->transport_timer); | |
2849 | conn->transport_timer.data = (unsigned long)conn; | |
2850 | conn->transport_timer.function = iscsi_check_transport_timeouts; | |
2851 | ||
843c0a8a | 2852 | INIT_LIST_HEAD(&conn->mgmtqueue); |
3bbaaad9 | 2853 | INIT_LIST_HEAD(&conn->cmdqueue); |
843c0a8a | 2854 | INIT_LIST_HEAD(&conn->requeue); |
c4028958 | 2855 | INIT_WORK(&conn->xmitwork, iscsi_xmitworker); |
7996a778 | 2856 | |
9c19a7d0 | 2857 | /* allocate login_task used for the login/text sequences */ |
7996a778 | 2858 | spin_lock_bh(&session->lock); |
7acd72eb | 2859 | if (!kfifo_out(&session->cmdpool.queue, |
9c19a7d0 | 2860 | (void*)&conn->login_task, |
7996a778 MC |
2861 | sizeof(void*))) { |
2862 | spin_unlock_bh(&session->lock); | |
9c19a7d0 | 2863 | goto login_task_alloc_fail; |
7996a778 MC |
2864 | } |
2865 | spin_unlock_bh(&session->lock); | |
2866 | ||
cfeb2cf9 MC |
2867 | data = (char *) __get_free_pages(GFP_KERNEL, |
2868 | get_order(ISCSI_DEF_MAX_RECV_SEG_LEN)); | |
d36ab6f3 | 2869 | if (!data) |
9c19a7d0 MC |
2870 | goto login_task_data_alloc_fail; |
2871 | conn->login_task->data = conn->data = data; | |
d36ab6f3 | 2872 | |
843c0a8a | 2873 | init_timer(&conn->tmf_timer); |
7996a778 MC |
2874 | init_waitqueue_head(&conn->ehwait); |
2875 | ||
2876 | return cls_conn; | |
2877 | ||
9c19a7d0 | 2878 | login_task_data_alloc_fail: |
7acd72eb | 2879 | kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task, |
d36ab6f3 | 2880 | sizeof(void*)); |
9c19a7d0 | 2881 | login_task_alloc_fail: |
7996a778 MC |
2882 | iscsi_destroy_conn(cls_conn); |
2883 | return NULL; | |
2884 | } | |
2885 | EXPORT_SYMBOL_GPL(iscsi_conn_setup); | |
2886 | ||
2887 | /** | |
2888 | * iscsi_conn_teardown - teardown iscsi connection | |
2889 | * cls_conn: iscsi class connection | |
2890 | * | |
2891 | * TODO: we may need to make this into a two step process | |
2892 | * like scsi-mls remove + put host | |
2893 | */ | |
2894 | void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn) | |
2895 | { | |
2896 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2897 | struct iscsi_session *session = conn->session; | |
2898 | unsigned long flags; | |
2899 | ||
f6d5180c MC |
2900 | del_timer_sync(&conn->transport_timer); |
2901 | ||
7996a778 MC |
2902 | spin_lock_bh(&session->lock); |
2903 | conn->c_stage = ISCSI_CONN_CLEANUP_WAIT; | |
2904 | if (session->leadconn == conn) { | |
2905 | /* | |
2906 | * leading connection? then give up on recovery. | |
2907 | */ | |
2908 | session->state = ISCSI_STATE_TERMINATE; | |
2909 | wake_up(&conn->ehwait); | |
2910 | } | |
2911 | spin_unlock_bh(&session->lock); | |
2912 | ||
7996a778 MC |
2913 | /* |
2914 | * Block until all in-progress commands for this connection | |
2915 | * time out or fail. | |
2916 | */ | |
2917 | for (;;) { | |
2918 | spin_lock_irqsave(session->host->host_lock, flags); | |
2919 | if (!session->host->host_busy) { /* OK for ERL == 0 */ | |
2920 | spin_unlock_irqrestore(session->host->host_lock, flags); | |
2921 | break; | |
2922 | } | |
2923 | spin_unlock_irqrestore(session->host->host_lock, flags); | |
2924 | msleep_interruptible(500); | |
322d739d MC |
2925 | iscsi_conn_printk(KERN_INFO, conn, "iscsi conn_destroy(): " |
2926 | "host_busy %d host_failed %d\n", | |
2927 | session->host->host_busy, | |
2928 | session->host->host_failed); | |
7996a778 MC |
2929 | /* |
2930 | * force eh_abort() to unblock | |
2931 | */ | |
2932 | wake_up(&conn->ehwait); | |
2933 | } | |
2934 | ||
779ea120 | 2935 | /* flush queued up work because we free the connection below */ |
843c0a8a | 2936 | iscsi_suspend_tx(conn); |
779ea120 | 2937 | |
7996a778 | 2938 | spin_lock_bh(&session->lock); |
cfeb2cf9 MC |
2939 | free_pages((unsigned long) conn->data, |
2940 | get_order(ISCSI_DEF_MAX_RECV_SEG_LEN)); | |
f3ff0c36 | 2941 | kfree(conn->persistent_address); |
7acd72eb | 2942 | kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task, |
7996a778 | 2943 | sizeof(void*)); |
e0726407 | 2944 | if (session->leadconn == conn) |
7996a778 | 2945 | session->leadconn = NULL; |
7996a778 MC |
2946 | spin_unlock_bh(&session->lock); |
2947 | ||
7996a778 MC |
2948 | iscsi_destroy_conn(cls_conn); |
2949 | } | |
2950 | EXPORT_SYMBOL_GPL(iscsi_conn_teardown); | |
2951 | ||
2952 | int iscsi_conn_start(struct iscsi_cls_conn *cls_conn) | |
2953 | { | |
2954 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2955 | struct iscsi_session *session = conn->session; | |
2956 | ||
ffd0436e | 2957 | if (!session) { |
322d739d MC |
2958 | iscsi_conn_printk(KERN_ERR, conn, |
2959 | "can't start unbound connection\n"); | |
7996a778 MC |
2960 | return -EPERM; |
2961 | } | |
2962 | ||
db98ccde MC |
2963 | if ((session->imm_data_en || !session->initial_r2t_en) && |
2964 | session->first_burst > session->max_burst) { | |
322d739d MC |
2965 | iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: " |
2966 | "first_burst %d max_burst %d\n", | |
2967 | session->first_burst, session->max_burst); | |
ffd0436e MC |
2968 | return -EINVAL; |
2969 | } | |
2970 | ||
f6d5180c | 2971 | if (conn->ping_timeout && !conn->recv_timeout) { |
322d739d MC |
2972 | iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of " |
2973 | "zero. Using 5 seconds\n."); | |
f6d5180c MC |
2974 | conn->recv_timeout = 5; |
2975 | } | |
2976 | ||
2977 | if (conn->recv_timeout && !conn->ping_timeout) { | |
322d739d MC |
2978 | iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of " |
2979 | "zero. Using 5 seconds.\n"); | |
f6d5180c MC |
2980 | conn->ping_timeout = 5; |
2981 | } | |
2982 | ||
7996a778 MC |
2983 | spin_lock_bh(&session->lock); |
2984 | conn->c_stage = ISCSI_CONN_STARTED; | |
2985 | session->state = ISCSI_STATE_LOGGED_IN; | |
e0726407 | 2986 | session->queued_cmdsn = session->cmdsn; |
7996a778 | 2987 | |
f6d5180c MC |
2988 | conn->last_recv = jiffies; |
2989 | conn->last_ping = jiffies; | |
2990 | if (conn->recv_timeout && conn->ping_timeout) | |
2991 | mod_timer(&conn->transport_timer, | |
2992 | jiffies + (conn->recv_timeout * HZ)); | |
2993 | ||
7996a778 MC |
2994 | switch(conn->stop_stage) { |
2995 | case STOP_CONN_RECOVER: | |
2996 | /* | |
2997 | * unblock eh_abort() if it is blocked. re-try all | |
2998 | * commands after successful recovery | |
2999 | */ | |
7996a778 | 3000 | conn->stop_stage = 0; |
843c0a8a | 3001 | conn->tmf_state = TMF_INITIAL; |
7996a778 | 3002 | session->age++; |
8b1d0343 MC |
3003 | if (session->age == 16) |
3004 | session->age = 0; | |
6eabafbe | 3005 | break; |
7996a778 | 3006 | case STOP_CONN_TERM: |
7996a778 | 3007 | conn->stop_stage = 0; |
7996a778 MC |
3008 | break; |
3009 | default: | |
3010 | break; | |
3011 | } | |
3012 | spin_unlock_bh(&session->lock); | |
3013 | ||
75613521 | 3014 | iscsi_unblock_session(session->cls_session); |
6eabafbe | 3015 | wake_up(&conn->ehwait); |
7996a778 MC |
3016 | return 0; |
3017 | } | |
3018 | EXPORT_SYMBOL_GPL(iscsi_conn_start); | |
3019 | ||
3020 | static void | |
3bbaaad9 | 3021 | fail_mgmt_tasks(struct iscsi_session *session, struct iscsi_conn *conn) |
7996a778 | 3022 | { |
3bbaaad9 | 3023 | struct iscsi_task *task; |
b3cd5050 | 3024 | int i, state; |
7996a778 | 3025 | |
3bbaaad9 MC |
3026 | for (i = 0; i < conn->session->cmds_max; i++) { |
3027 | task = conn->session->cmds[i]; | |
3028 | if (task->sc) | |
3029 | continue; | |
7996a778 | 3030 | |
3bbaaad9 MC |
3031 | if (task->state == ISCSI_TASK_FREE) |
3032 | continue; | |
7996a778 | 3033 | |
3bbaaad9 MC |
3034 | ISCSI_DBG_SESSION(conn->session, |
3035 | "failing mgmt itt 0x%x state %d\n", | |
3036 | task->itt, task->state); | |
b3cd5050 MC |
3037 | state = ISCSI_TASK_ABRT_SESS_RECOV; |
3038 | if (task->state == ISCSI_TASK_PENDING) | |
3039 | state = ISCSI_TASK_COMPLETED; | |
3040 | iscsi_complete_task(task, state); | |
3041 | ||
3bbaaad9 | 3042 | } |
7996a778 MC |
3043 | } |
3044 | ||
656cffc9 MC |
3045 | static void iscsi_start_session_recovery(struct iscsi_session *session, |
3046 | struct iscsi_conn *conn, int flag) | |
7996a778 | 3047 | { |
ed2abc7f MC |
3048 | int old_stop_stage; |
3049 | ||
6724add1 | 3050 | mutex_lock(&session->eh_mutex); |
7996a778 | 3051 | spin_lock_bh(&session->lock); |
ed2abc7f | 3052 | if (conn->stop_stage == STOP_CONN_TERM) { |
7996a778 | 3053 | spin_unlock_bh(&session->lock); |
6724add1 MC |
3054 | mutex_unlock(&session->eh_mutex); |
3055 | return; | |
3056 | } | |
3057 | ||
ed2abc7f MC |
3058 | /* |
3059 | * When this is called for the in_login state, we only want to clean | |
9c19a7d0 | 3060 | * up the login task and connection. We do not need to block and set |
67a61114 | 3061 | * the recovery state again |
ed2abc7f | 3062 | */ |
67a61114 MC |
3063 | if (flag == STOP_CONN_TERM) |
3064 | session->state = ISCSI_STATE_TERMINATE; | |
3065 | else if (conn->stop_stage != STOP_CONN_RECOVER) | |
3066 | session->state = ISCSI_STATE_IN_RECOVERY; | |
4ae0a6c1 MC |
3067 | |
3068 | old_stop_stage = conn->stop_stage; | |
3069 | conn->stop_stage = flag; | |
26013ad4 | 3070 | spin_unlock_bh(&session->lock); |
ed2abc7f | 3071 | |
26013ad4 MC |
3072 | del_timer_sync(&conn->transport_timer); |
3073 | iscsi_suspend_tx(conn); | |
3074 | ||
3075 | spin_lock_bh(&session->lock); | |
67a61114 | 3076 | conn->c_stage = ISCSI_CONN_STOPPED; |
7996a778 | 3077 | spin_unlock_bh(&session->lock); |
6724add1 | 3078 | |
7996a778 MC |
3079 | /* |
3080 | * for connection level recovery we should not calculate | |
3081 | * header digest. conn->hdr_size used for optimization | |
3082 | * in hdr_extract() and will be re-negotiated at | |
3083 | * set_param() time. | |
3084 | */ | |
3085 | if (flag == STOP_CONN_RECOVER) { | |
3086 | conn->hdrdgst_en = 0; | |
3087 | conn->datadgst_en = 0; | |
656cffc9 | 3088 | if (session->state == ISCSI_STATE_IN_RECOVERY && |
67a61114 | 3089 | old_stop_stage != STOP_CONN_RECOVER) { |
1b2c7af8 | 3090 | ISCSI_DBG_SESSION(session, "blocking session\n"); |
75613521 | 3091 | iscsi_block_session(session->cls_session); |
67a61114 | 3092 | } |
7996a778 | 3093 | } |
656cffc9 | 3094 | |
656cffc9 MC |
3095 | /* |
3096 | * flush queues. | |
3097 | */ | |
3098 | spin_lock_bh(&session->lock); | |
b3cd5050 | 3099 | fail_scsi_tasks(conn, -1, DID_TRANSPORT_DISRUPTED); |
3bbaaad9 | 3100 | fail_mgmt_tasks(session, conn); |
5d12c05e | 3101 | memset(&conn->tmhdr, 0, sizeof(conn->tmhdr)); |
656cffc9 | 3102 | spin_unlock_bh(&session->lock); |
6724add1 | 3103 | mutex_unlock(&session->eh_mutex); |
7996a778 | 3104 | } |
7996a778 MC |
3105 | |
3106 | void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) | |
3107 | { | |
3108 | struct iscsi_conn *conn = cls_conn->dd_data; | |
3109 | struct iscsi_session *session = conn->session; | |
3110 | ||
3111 | switch (flag) { | |
3112 | case STOP_CONN_RECOVER: | |
3113 | case STOP_CONN_TERM: | |
3114 | iscsi_start_session_recovery(session, conn, flag); | |
8d2860b3 | 3115 | break; |
7996a778 | 3116 | default: |
322d739d MC |
3117 | iscsi_conn_printk(KERN_ERR, conn, |
3118 | "invalid stop flag %d\n", flag); | |
7996a778 MC |
3119 | } |
3120 | } | |
3121 | EXPORT_SYMBOL_GPL(iscsi_conn_stop); | |
3122 | ||
3123 | int iscsi_conn_bind(struct iscsi_cls_session *cls_session, | |
3124 | struct iscsi_cls_conn *cls_conn, int is_leading) | |
3125 | { | |
75613521 | 3126 | struct iscsi_session *session = cls_session->dd_data; |
98644047 | 3127 | struct iscsi_conn *conn = cls_conn->dd_data; |
7996a778 | 3128 | |
7996a778 | 3129 | spin_lock_bh(&session->lock); |
7996a778 MC |
3130 | if (is_leading) |
3131 | session->leadconn = conn; | |
98644047 | 3132 | spin_unlock_bh(&session->lock); |
7996a778 MC |
3133 | |
3134 | /* | |
3135 | * Unblock xmitworker(), Login Phase will pass through. | |
3136 | */ | |
3137 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
3138 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
3139 | return 0; | |
3140 | } | |
3141 | EXPORT_SYMBOL_GPL(iscsi_conn_bind); | |
3142 | ||
5700b1af MC |
3143 | static int iscsi_switch_str_param(char **param, char *new_val_buf) |
3144 | { | |
3145 | char *new_val; | |
3146 | ||
3147 | if (*param) { | |
3148 | if (!strcmp(*param, new_val_buf)) | |
3149 | return 0; | |
3150 | } | |
3151 | ||
3152 | new_val = kstrdup(new_val_buf, GFP_NOIO); | |
3153 | if (!new_val) | |
3154 | return -ENOMEM; | |
3155 | ||
3156 | kfree(*param); | |
3157 | *param = new_val; | |
3158 | return 0; | |
3159 | } | |
a54a52ca MC |
3160 | |
3161 | int iscsi_set_param(struct iscsi_cls_conn *cls_conn, | |
3162 | enum iscsi_param param, char *buf, int buflen) | |
3163 | { | |
3164 | struct iscsi_conn *conn = cls_conn->dd_data; | |
3165 | struct iscsi_session *session = conn->session; | |
a54a52ca MC |
3166 | |
3167 | switch(param) { | |
843c0a8a MC |
3168 | case ISCSI_PARAM_FAST_ABORT: |
3169 | sscanf(buf, "%d", &session->fast_abort); | |
3170 | break; | |
f6d5180c MC |
3171 | case ISCSI_PARAM_ABORT_TMO: |
3172 | sscanf(buf, "%d", &session->abort_timeout); | |
3173 | break; | |
3174 | case ISCSI_PARAM_LU_RESET_TMO: | |
3175 | sscanf(buf, "%d", &session->lu_reset_timeout); | |
3176 | break; | |
3fe5ae8b MC |
3177 | case ISCSI_PARAM_TGT_RESET_TMO: |
3178 | sscanf(buf, "%d", &session->tgt_reset_timeout); | |
3179 | break; | |
f6d5180c MC |
3180 | case ISCSI_PARAM_PING_TMO: |
3181 | sscanf(buf, "%d", &conn->ping_timeout); | |
3182 | break; | |
3183 | case ISCSI_PARAM_RECV_TMO: | |
3184 | sscanf(buf, "%d", &conn->recv_timeout); | |
3185 | break; | |
a54a52ca MC |
3186 | case ISCSI_PARAM_MAX_RECV_DLENGTH: |
3187 | sscanf(buf, "%d", &conn->max_recv_dlength); | |
3188 | break; | |
3189 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
3190 | sscanf(buf, "%d", &conn->max_xmit_dlength); | |
3191 | break; | |
3192 | case ISCSI_PARAM_HDRDGST_EN: | |
3193 | sscanf(buf, "%d", &conn->hdrdgst_en); | |
3194 | break; | |
3195 | case ISCSI_PARAM_DATADGST_EN: | |
3196 | sscanf(buf, "%d", &conn->datadgst_en); | |
3197 | break; | |
3198 | case ISCSI_PARAM_INITIAL_R2T_EN: | |
3199 | sscanf(buf, "%d", &session->initial_r2t_en); | |
3200 | break; | |
3201 | case ISCSI_PARAM_MAX_R2T: | |
3202 | sscanf(buf, "%d", &session->max_r2t); | |
3203 | break; | |
3204 | case ISCSI_PARAM_IMM_DATA_EN: | |
3205 | sscanf(buf, "%d", &session->imm_data_en); | |
3206 | break; | |
3207 | case ISCSI_PARAM_FIRST_BURST: | |
3208 | sscanf(buf, "%d", &session->first_burst); | |
3209 | break; | |
3210 | case ISCSI_PARAM_MAX_BURST: | |
3211 | sscanf(buf, "%d", &session->max_burst); | |
3212 | break; | |
3213 | case ISCSI_PARAM_PDU_INORDER_EN: | |
3214 | sscanf(buf, "%d", &session->pdu_inorder_en); | |
3215 | break; | |
3216 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
3217 | sscanf(buf, "%d", &session->dataseq_inorder_en); | |
3218 | break; | |
3219 | case ISCSI_PARAM_ERL: | |
3220 | sscanf(buf, "%d", &session->erl); | |
3221 | break; | |
a54a52ca MC |
3222 | case ISCSI_PARAM_EXP_STATSN: |
3223 | sscanf(buf, "%u", &conn->exp_statsn); | |
3224 | break; | |
b2c64167 | 3225 | case ISCSI_PARAM_USERNAME: |
5700b1af | 3226 | return iscsi_switch_str_param(&session->username, buf); |
b2c64167 | 3227 | case ISCSI_PARAM_USERNAME_IN: |
5700b1af | 3228 | return iscsi_switch_str_param(&session->username_in, buf); |
b2c64167 | 3229 | case ISCSI_PARAM_PASSWORD: |
5700b1af | 3230 | return iscsi_switch_str_param(&session->password, buf); |
b2c64167 | 3231 | case ISCSI_PARAM_PASSWORD_IN: |
5700b1af | 3232 | return iscsi_switch_str_param(&session->password_in, buf); |
a54a52ca | 3233 | case ISCSI_PARAM_TARGET_NAME: |
5700b1af | 3234 | return iscsi_switch_str_param(&session->targetname, buf); |
a54a52ca MC |
3235 | case ISCSI_PARAM_TPGT: |
3236 | sscanf(buf, "%d", &session->tpgt); | |
3237 | break; | |
3238 | case ISCSI_PARAM_PERSISTENT_PORT: | |
3239 | sscanf(buf, "%d", &conn->persistent_port); | |
3240 | break; | |
3241 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
5700b1af | 3242 | return iscsi_switch_str_param(&conn->persistent_address, buf); |
88dfd340 | 3243 | case ISCSI_PARAM_IFACE_NAME: |
5700b1af | 3244 | return iscsi_switch_str_param(&session->ifacename, buf); |
88dfd340 | 3245 | case ISCSI_PARAM_INITIATOR_NAME: |
5700b1af | 3246 | return iscsi_switch_str_param(&session->initiatorname, buf); |
a54a52ca MC |
3247 | default: |
3248 | return -ENOSYS; | |
3249 | } | |
3250 | ||
3251 | return 0; | |
3252 | } | |
3253 | EXPORT_SYMBOL_GPL(iscsi_set_param); | |
3254 | ||
3255 | int iscsi_session_get_param(struct iscsi_cls_session *cls_session, | |
3256 | enum iscsi_param param, char *buf) | |
3257 | { | |
75613521 | 3258 | struct iscsi_session *session = cls_session->dd_data; |
a54a52ca MC |
3259 | int len; |
3260 | ||
3261 | switch(param) { | |
843c0a8a MC |
3262 | case ISCSI_PARAM_FAST_ABORT: |
3263 | len = sprintf(buf, "%d\n", session->fast_abort); | |
3264 | break; | |
f6d5180c MC |
3265 | case ISCSI_PARAM_ABORT_TMO: |
3266 | len = sprintf(buf, "%d\n", session->abort_timeout); | |
3267 | break; | |
3268 | case ISCSI_PARAM_LU_RESET_TMO: | |
3269 | len = sprintf(buf, "%d\n", session->lu_reset_timeout); | |
3270 | break; | |
3fe5ae8b MC |
3271 | case ISCSI_PARAM_TGT_RESET_TMO: |
3272 | len = sprintf(buf, "%d\n", session->tgt_reset_timeout); | |
3273 | break; | |
a54a52ca MC |
3274 | case ISCSI_PARAM_INITIAL_R2T_EN: |
3275 | len = sprintf(buf, "%d\n", session->initial_r2t_en); | |
3276 | break; | |
3277 | case ISCSI_PARAM_MAX_R2T: | |
3278 | len = sprintf(buf, "%hu\n", session->max_r2t); | |
3279 | break; | |
3280 | case ISCSI_PARAM_IMM_DATA_EN: | |
3281 | len = sprintf(buf, "%d\n", session->imm_data_en); | |
3282 | break; | |
3283 | case ISCSI_PARAM_FIRST_BURST: | |
3284 | len = sprintf(buf, "%u\n", session->first_burst); | |
3285 | break; | |
3286 | case ISCSI_PARAM_MAX_BURST: | |
3287 | len = sprintf(buf, "%u\n", session->max_burst); | |
3288 | break; | |
3289 | case ISCSI_PARAM_PDU_INORDER_EN: | |
3290 | len = sprintf(buf, "%d\n", session->pdu_inorder_en); | |
3291 | break; | |
3292 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
3293 | len = sprintf(buf, "%d\n", session->dataseq_inorder_en); | |
3294 | break; | |
3295 | case ISCSI_PARAM_ERL: | |
3296 | len = sprintf(buf, "%d\n", session->erl); | |
3297 | break; | |
3298 | case ISCSI_PARAM_TARGET_NAME: | |
3299 | len = sprintf(buf, "%s\n", session->targetname); | |
3300 | break; | |
3301 | case ISCSI_PARAM_TPGT: | |
3302 | len = sprintf(buf, "%d\n", session->tpgt); | |
3303 | break; | |
b2c64167 MC |
3304 | case ISCSI_PARAM_USERNAME: |
3305 | len = sprintf(buf, "%s\n", session->username); | |
3306 | break; | |
3307 | case ISCSI_PARAM_USERNAME_IN: | |
3308 | len = sprintf(buf, "%s\n", session->username_in); | |
3309 | break; | |
3310 | case ISCSI_PARAM_PASSWORD: | |
3311 | len = sprintf(buf, "%s\n", session->password); | |
3312 | break; | |
3313 | case ISCSI_PARAM_PASSWORD_IN: | |
3314 | len = sprintf(buf, "%s\n", session->password_in); | |
3315 | break; | |
88dfd340 MC |
3316 | case ISCSI_PARAM_IFACE_NAME: |
3317 | len = sprintf(buf, "%s\n", session->ifacename); | |
3318 | break; | |
3319 | case ISCSI_PARAM_INITIATOR_NAME: | |
5700b1af | 3320 | len = sprintf(buf, "%s\n", session->initiatorname); |
88dfd340 | 3321 | break; |
a54a52ca MC |
3322 | default: |
3323 | return -ENOSYS; | |
3324 | } | |
3325 | ||
3326 | return len; | |
3327 | } | |
3328 | EXPORT_SYMBOL_GPL(iscsi_session_get_param); | |
3329 | ||
00f3708e MC |
3330 | int iscsi_conn_get_addr_param(struct sockaddr_storage *addr, |
3331 | enum iscsi_param param, char *buf) | |
3332 | { | |
3333 | struct sockaddr_in6 *sin6 = NULL; | |
3334 | struct sockaddr_in *sin = NULL; | |
3335 | int len; | |
3336 | ||
3337 | switch (addr->ss_family) { | |
3338 | case AF_INET: | |
3339 | sin = (struct sockaddr_in *)addr; | |
3340 | break; | |
3341 | case AF_INET6: | |
3342 | sin6 = (struct sockaddr_in6 *)addr; | |
3343 | break; | |
3344 | default: | |
3345 | return -EINVAL; | |
3346 | } | |
3347 | ||
3348 | switch (param) { | |
3349 | case ISCSI_PARAM_CONN_ADDRESS: | |
3350 | case ISCSI_HOST_PARAM_IPADDRESS: | |
3351 | if (sin) | |
3352 | len = sprintf(buf, "%pI4\n", &sin->sin_addr.s_addr); | |
3353 | else | |
3354 | len = sprintf(buf, "%pI6\n", &sin6->sin6_addr); | |
3355 | break; | |
3356 | case ISCSI_PARAM_CONN_PORT: | |
3357 | if (sin) | |
3358 | len = sprintf(buf, "%hu\n", be16_to_cpu(sin->sin_port)); | |
3359 | else | |
3360 | len = sprintf(buf, "%hu\n", | |
3361 | be16_to_cpu(sin6->sin6_port)); | |
3362 | break; | |
3363 | default: | |
3364 | return -EINVAL; | |
3365 | } | |
3366 | ||
3367 | return len; | |
3368 | } | |
3369 | EXPORT_SYMBOL_GPL(iscsi_conn_get_addr_param); | |
3370 | ||
a54a52ca MC |
3371 | int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn, |
3372 | enum iscsi_param param, char *buf) | |
3373 | { | |
3374 | struct iscsi_conn *conn = cls_conn->dd_data; | |
3375 | int len; | |
3376 | ||
3377 | switch(param) { | |
f6d5180c MC |
3378 | case ISCSI_PARAM_PING_TMO: |
3379 | len = sprintf(buf, "%u\n", conn->ping_timeout); | |
3380 | break; | |
3381 | case ISCSI_PARAM_RECV_TMO: | |
3382 | len = sprintf(buf, "%u\n", conn->recv_timeout); | |
3383 | break; | |
a54a52ca MC |
3384 | case ISCSI_PARAM_MAX_RECV_DLENGTH: |
3385 | len = sprintf(buf, "%u\n", conn->max_recv_dlength); | |
3386 | break; | |
3387 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
3388 | len = sprintf(buf, "%u\n", conn->max_xmit_dlength); | |
3389 | break; | |
3390 | case ISCSI_PARAM_HDRDGST_EN: | |
3391 | len = sprintf(buf, "%d\n", conn->hdrdgst_en); | |
3392 | break; | |
3393 | case ISCSI_PARAM_DATADGST_EN: | |
3394 | len = sprintf(buf, "%d\n", conn->datadgst_en); | |
3395 | break; | |
3396 | case ISCSI_PARAM_IFMARKER_EN: | |
3397 | len = sprintf(buf, "%d\n", conn->ifmarker_en); | |
3398 | break; | |
3399 | case ISCSI_PARAM_OFMARKER_EN: | |
3400 | len = sprintf(buf, "%d\n", conn->ofmarker_en); | |
3401 | break; | |
3402 | case ISCSI_PARAM_EXP_STATSN: | |
3403 | len = sprintf(buf, "%u\n", conn->exp_statsn); | |
3404 | break; | |
3405 | case ISCSI_PARAM_PERSISTENT_PORT: | |
3406 | len = sprintf(buf, "%d\n", conn->persistent_port); | |
3407 | break; | |
3408 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
3409 | len = sprintf(buf, "%s\n", conn->persistent_address); | |
3410 | break; | |
3411 | default: | |
3412 | return -ENOSYS; | |
3413 | } | |
3414 | ||
3415 | return len; | |
3416 | } | |
3417 | EXPORT_SYMBOL_GPL(iscsi_conn_get_param); | |
3418 | ||
0801c242 MC |
3419 | int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param, |
3420 | char *buf) | |
3421 | { | |
75613521 | 3422 | struct iscsi_host *ihost = shost_priv(shost); |
0801c242 MC |
3423 | int len; |
3424 | ||
3425 | switch (param) { | |
d8196ed2 | 3426 | case ISCSI_HOST_PARAM_NETDEV_NAME: |
5700b1af | 3427 | len = sprintf(buf, "%s\n", ihost->netdev); |
d8196ed2 | 3428 | break; |
0801c242 | 3429 | case ISCSI_HOST_PARAM_HWADDRESS: |
5700b1af | 3430 | len = sprintf(buf, "%s\n", ihost->hwaddress); |
0801c242 | 3431 | break; |
8ad5781a | 3432 | case ISCSI_HOST_PARAM_INITIATOR_NAME: |
5700b1af | 3433 | len = sprintf(buf, "%s\n", ihost->initiatorname); |
8ad5781a | 3434 | break; |
0801c242 MC |
3435 | default: |
3436 | return -ENOSYS; | |
3437 | } | |
3438 | ||
3439 | return len; | |
3440 | } | |
3441 | EXPORT_SYMBOL_GPL(iscsi_host_get_param); | |
3442 | ||
3443 | int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param, | |
3444 | char *buf, int buflen) | |
3445 | { | |
75613521 | 3446 | struct iscsi_host *ihost = shost_priv(shost); |
0801c242 MC |
3447 | |
3448 | switch (param) { | |
d8196ed2 | 3449 | case ISCSI_HOST_PARAM_NETDEV_NAME: |
5700b1af | 3450 | return iscsi_switch_str_param(&ihost->netdev, buf); |
0801c242 | 3451 | case ISCSI_HOST_PARAM_HWADDRESS: |
5700b1af | 3452 | return iscsi_switch_str_param(&ihost->hwaddress, buf); |
8ad5781a | 3453 | case ISCSI_HOST_PARAM_INITIATOR_NAME: |
5700b1af | 3454 | return iscsi_switch_str_param(&ihost->initiatorname, buf); |
0801c242 MC |
3455 | default: |
3456 | return -ENOSYS; | |
3457 | } | |
3458 | ||
3459 | return 0; | |
3460 | } | |
3461 | EXPORT_SYMBOL_GPL(iscsi_host_set_param); | |
3462 | ||
7996a778 MC |
3463 | MODULE_AUTHOR("Mike Christie"); |
3464 | MODULE_DESCRIPTION("iSCSI library functions"); | |
3465 | MODULE_LICENSE("GPL"); |