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> |
3f07c014 | 29 | #include <linux/sched/signal.h> |
acf3368f | 30 | #include <linux/module.h> |
8eb00539 | 31 | #include <asm/unaligned.h> |
7996a778 MC |
32 | #include <net/tcp.h> |
33 | #include <scsi/scsi_cmnd.h> | |
34 | #include <scsi/scsi_device.h> | |
35 | #include <scsi/scsi_eh.h> | |
36 | #include <scsi/scsi_tcq.h> | |
37 | #include <scsi/scsi_host.h> | |
38 | #include <scsi/scsi.h> | |
39 | #include <scsi/iscsi_proto.h> | |
40 | #include <scsi/scsi_transport.h> | |
41 | #include <scsi/scsi_transport_iscsi.h> | |
42 | #include <scsi/libiscsi.h> | |
c2332b00 | 43 | #include <trace/events/iscsi.h> |
7996a778 | 44 | |
bd2199d4 EZ |
45 | static int iscsi_dbg_lib_conn; |
46 | module_param_named(debug_libiscsi_conn, iscsi_dbg_lib_conn, int, | |
47 | S_IRUGO | S_IWUSR); | |
48 | MODULE_PARM_DESC(debug_libiscsi_conn, | |
49 | "Turn on debugging for connections in libiscsi module. " | |
50 | "Set to 1 to turn on, and zero to turn off. Default is off."); | |
51 | ||
52 | static int iscsi_dbg_lib_session; | |
53 | module_param_named(debug_libiscsi_session, iscsi_dbg_lib_session, int, | |
54 | S_IRUGO | S_IWUSR); | |
55 | MODULE_PARM_DESC(debug_libiscsi_session, | |
56 | "Turn on debugging for sessions in libiscsi module. " | |
57 | "Set to 1 to turn on, and zero to turn off. Default is off."); | |
58 | ||
59 | static int iscsi_dbg_lib_eh; | |
60 | module_param_named(debug_libiscsi_eh, iscsi_dbg_lib_eh, int, | |
61 | S_IRUGO | S_IWUSR); | |
62 | MODULE_PARM_DESC(debug_libiscsi_eh, | |
63 | "Turn on debugging for error handling in libiscsi module. " | |
64 | "Set to 1 to turn on, and zero to turn off. Default is off."); | |
1b2c7af8 MC |
65 | |
66 | #define ISCSI_DBG_CONN(_conn, dbg_fmt, arg...) \ | |
67 | do { \ | |
bd2199d4 | 68 | if (iscsi_dbg_lib_conn) \ |
1b2c7af8 MC |
69 | iscsi_conn_printk(KERN_INFO, _conn, \ |
70 | "%s " dbg_fmt, \ | |
71 | __func__, ##arg); \ | |
c2332b00 FH |
72 | iscsi_dbg_trace(trace_iscsi_dbg_conn, \ |
73 | &(_conn)->cls_conn->dev, \ | |
74 | "%s " dbg_fmt, __func__, ##arg);\ | |
1b2c7af8 MC |
75 | } while (0); |
76 | ||
77 | #define ISCSI_DBG_SESSION(_session, dbg_fmt, arg...) \ | |
78 | do { \ | |
bd2199d4 EZ |
79 | if (iscsi_dbg_lib_session) \ |
80 | iscsi_session_printk(KERN_INFO, _session, \ | |
81 | "%s " dbg_fmt, \ | |
82 | __func__, ##arg); \ | |
c2332b00 FH |
83 | iscsi_dbg_trace(trace_iscsi_dbg_session, \ |
84 | &(_session)->cls_session->dev, \ | |
85 | "%s " dbg_fmt, __func__, ##arg); \ | |
bd2199d4 EZ |
86 | } while (0); |
87 | ||
88 | #define ISCSI_DBG_EH(_session, dbg_fmt, arg...) \ | |
89 | do { \ | |
90 | if (iscsi_dbg_lib_eh) \ | |
1b2c7af8 MC |
91 | iscsi_session_printk(KERN_INFO, _session, \ |
92 | "%s " dbg_fmt, \ | |
93 | __func__, ##arg); \ | |
c2332b00 FH |
94 | iscsi_dbg_trace(trace_iscsi_dbg_eh, \ |
95 | &(_session)->cls_session->dev, \ | |
96 | "%s " dbg_fmt, __func__, ##arg); \ | |
1b2c7af8 MC |
97 | } while (0); |
98 | ||
32ae763e MC |
99 | inline void iscsi_conn_queue_work(struct iscsi_conn *conn) |
100 | { | |
101 | struct Scsi_Host *shost = conn->session->host; | |
102 | struct iscsi_host *ihost = shost_priv(shost); | |
103 | ||
1336aed1 MC |
104 | if (ihost->workq) |
105 | queue_work(ihost->workq, &conn->xmitwork); | |
32ae763e MC |
106 | } |
107 | EXPORT_SYMBOL_GPL(iscsi_conn_queue_work); | |
108 | ||
4c0ba5d2 MC |
109 | static void __iscsi_update_cmdsn(struct iscsi_session *session, |
110 | uint32_t exp_cmdsn, uint32_t max_cmdsn) | |
7996a778 | 111 | { |
77a23c21 MC |
112 | /* |
113 | * standard specifies this check for when to update expected and | |
114 | * max sequence numbers | |
115 | */ | |
116 | if (iscsi_sna_lt(max_cmdsn, exp_cmdsn - 1)) | |
117 | return; | |
118 | ||
119 | if (exp_cmdsn != session->exp_cmdsn && | |
120 | !iscsi_sna_lt(exp_cmdsn, session->exp_cmdsn)) | |
7996a778 MC |
121 | session->exp_cmdsn = exp_cmdsn; |
122 | ||
77a23c21 | 123 | if (max_cmdsn != session->max_cmdsn && |
46a84c65 | 124 | !iscsi_sna_lt(max_cmdsn, session->max_cmdsn)) |
77a23c21 | 125 | session->max_cmdsn = max_cmdsn; |
7996a778 | 126 | } |
4c0ba5d2 MC |
127 | |
128 | void iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr) | |
129 | { | |
130 | __iscsi_update_cmdsn(session, be32_to_cpu(hdr->exp_cmdsn), | |
131 | be32_to_cpu(hdr->max_cmdsn)); | |
132 | } | |
77a23c21 | 133 | EXPORT_SYMBOL_GPL(iscsi_update_cmdsn); |
7996a778 | 134 | |
577577da MC |
135 | /** |
136 | * iscsi_prep_data_out_pdu - initialize Data-Out | |
137 | * @task: scsi command task | |
138 | * @r2t: R2T info | |
139 | * @hdr: iscsi data in pdu | |
140 | * | |
141 | * Notes: | |
142 | * Initialize Data-Out within this R2T sequence and finds | |
143 | * proper data_offset within this SCSI command. | |
144 | * | |
145 | * This function is called with connection lock taken. | |
146 | **/ | |
147 | void iscsi_prep_data_out_pdu(struct iscsi_task *task, struct iscsi_r2t_info *r2t, | |
148 | struct iscsi_data *hdr) | |
7996a778 | 149 | { |
9c19a7d0 | 150 | struct iscsi_conn *conn = task->conn; |
577577da MC |
151 | unsigned int left = r2t->data_length - r2t->sent; |
152 | ||
153 | task->hdr_len = sizeof(struct iscsi_data); | |
7996a778 MC |
154 | |
155 | memset(hdr, 0, sizeof(struct iscsi_data)); | |
577577da MC |
156 | hdr->ttt = r2t->ttt; |
157 | hdr->datasn = cpu_to_be32(r2t->datasn); | |
158 | r2t->datasn++; | |
7996a778 | 159 | hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; |
55bdabdf | 160 | hdr->lun = task->lun; |
577577da MC |
161 | hdr->itt = task->hdr_itt; |
162 | hdr->exp_statsn = r2t->exp_statsn; | |
163 | hdr->offset = cpu_to_be32(r2t->data_offset + r2t->sent); | |
164 | if (left > conn->max_xmit_dlength) { | |
7996a778 | 165 | hton24(hdr->dlength, conn->max_xmit_dlength); |
577577da | 166 | r2t->data_count = conn->max_xmit_dlength; |
7996a778 MC |
167 | hdr->flags = 0; |
168 | } else { | |
577577da MC |
169 | hton24(hdr->dlength, left); |
170 | r2t->data_count = left; | |
7996a778 MC |
171 | hdr->flags = ISCSI_FLAG_CMD_FINAL; |
172 | } | |
577577da | 173 | conn->dataout_pdus_cnt++; |
7996a778 | 174 | } |
577577da | 175 | EXPORT_SYMBOL_GPL(iscsi_prep_data_out_pdu); |
7996a778 | 176 | |
9c19a7d0 | 177 | static int iscsi_add_hdr(struct iscsi_task *task, unsigned len) |
004d6530 | 178 | { |
9c19a7d0 | 179 | unsigned exp_len = task->hdr_len + len; |
004d6530 | 180 | |
9c19a7d0 | 181 | if (exp_len > task->hdr_max) { |
004d6530 BH |
182 | WARN_ON(1); |
183 | return -EINVAL; | |
184 | } | |
185 | ||
186 | WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */ | |
9c19a7d0 | 187 | task->hdr_len = exp_len; |
004d6530 BH |
188 | return 0; |
189 | } | |
190 | ||
38d1c069 BH |
191 | /* |
192 | * make an extended cdb AHS | |
193 | */ | |
9c19a7d0 | 194 | static int iscsi_prep_ecdb_ahs(struct iscsi_task *task) |
38d1c069 | 195 | { |
9c19a7d0 | 196 | struct scsi_cmnd *cmd = task->sc; |
38d1c069 BH |
197 | unsigned rlen, pad_len; |
198 | unsigned short ahslength; | |
199 | struct iscsi_ecdb_ahdr *ecdb_ahdr; | |
200 | int rc; | |
201 | ||
9c19a7d0 | 202 | ecdb_ahdr = iscsi_next_hdr(task); |
38d1c069 BH |
203 | rlen = cmd->cmd_len - ISCSI_CDB_SIZE; |
204 | ||
205 | BUG_ON(rlen > sizeof(ecdb_ahdr->ecdb)); | |
206 | ahslength = rlen + sizeof(ecdb_ahdr->reserved); | |
207 | ||
208 | pad_len = iscsi_padding(rlen); | |
209 | ||
9c19a7d0 | 210 | rc = iscsi_add_hdr(task, sizeof(ecdb_ahdr->ahslength) + |
38d1c069 BH |
211 | sizeof(ecdb_ahdr->ahstype) + ahslength + pad_len); |
212 | if (rc) | |
213 | return rc; | |
214 | ||
215 | if (pad_len) | |
216 | memset(&ecdb_ahdr->ecdb[rlen], 0, pad_len); | |
217 | ||
218 | ecdb_ahdr->ahslength = cpu_to_be16(ahslength); | |
219 | ecdb_ahdr->ahstype = ISCSI_AHSTYPE_CDB; | |
220 | ecdb_ahdr->reserved = 0; | |
221 | memcpy(ecdb_ahdr->ecdb, cmd->cmnd + ISCSI_CDB_SIZE, rlen); | |
222 | ||
1b2c7af8 MC |
223 | ISCSI_DBG_SESSION(task->conn->session, |
224 | "iscsi_prep_ecdb_ahs: varlen_cdb_len %d " | |
225 | "rlen %d pad_len %d ahs_length %d iscsi_headers_size " | |
226 | "%u\n", cmd->cmd_len, rlen, pad_len, ahslength, | |
227 | task->hdr_len); | |
38d1c069 BH |
228 | return 0; |
229 | } | |
230 | ||
9c19a7d0 | 231 | static int iscsi_prep_bidi_ahs(struct iscsi_task *task) |
c07d4444 | 232 | { |
9c19a7d0 | 233 | struct scsi_cmnd *sc = task->sc; |
c07d4444 BH |
234 | struct iscsi_rlength_ahdr *rlen_ahdr; |
235 | int rc; | |
236 | ||
9c19a7d0 MC |
237 | rlen_ahdr = iscsi_next_hdr(task); |
238 | rc = iscsi_add_hdr(task, sizeof(*rlen_ahdr)); | |
c07d4444 BH |
239 | if (rc) |
240 | return rc; | |
241 | ||
242 | rlen_ahdr->ahslength = | |
243 | cpu_to_be16(sizeof(rlen_ahdr->read_length) + | |
244 | sizeof(rlen_ahdr->reserved)); | |
245 | rlen_ahdr->ahstype = ISCSI_AHSTYPE_RLENGTH; | |
246 | rlen_ahdr->reserved = 0; | |
247 | rlen_ahdr->read_length = cpu_to_be32(scsi_in(sc)->length); | |
248 | ||
1b2c7af8 MC |
249 | ISCSI_DBG_SESSION(task->conn->session, |
250 | "bidi-in rlen_ahdr->read_length(%d) " | |
251 | "rlen_ahdr->ahslength(%d)\n", | |
252 | be32_to_cpu(rlen_ahdr->read_length), | |
253 | be16_to_cpu(rlen_ahdr->ahslength)); | |
c07d4444 BH |
254 | return 0; |
255 | } | |
256 | ||
5d12c05e MC |
257 | /** |
258 | * iscsi_check_tmf_restrictions - check if a task is affected by TMF | |
259 | * @task: iscsi task | |
260 | * @opcode: opcode to check for | |
261 | * | |
262 | * During TMF a task has to be checked if it's affected. | |
263 | * All unrelated I/O can be passed through, but I/O to the | |
264 | * affected LUN should be restricted. | |
265 | * If 'fast_abort' is set we won't be sending any I/O to the | |
266 | * affected LUN. | |
267 | * Otherwise the target is waiting for all TTTs to be completed, | |
268 | * so we have to send all outstanding Data-Out PDUs to the target. | |
269 | */ | |
270 | static int iscsi_check_tmf_restrictions(struct iscsi_task *task, int opcode) | |
271 | { | |
272 | struct iscsi_conn *conn = task->conn; | |
273 | struct iscsi_tm *tmf = &conn->tmhdr; | |
9cb78c16 | 274 | u64 hdr_lun; |
5d12c05e MC |
275 | |
276 | if (conn->tmf_state == TMF_INITIAL) | |
277 | return 0; | |
278 | ||
279 | if ((tmf->opcode & ISCSI_OPCODE_MASK) != ISCSI_OP_SCSI_TMFUNC) | |
280 | return 0; | |
281 | ||
282 | switch (ISCSI_TM_FUNC_VALUE(tmf)) { | |
283 | case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: | |
284 | /* | |
285 | * Allow PDUs for unrelated LUNs | |
286 | */ | |
55bdabdf | 287 | hdr_lun = scsilun_to_int(&tmf->lun); |
5d12c05e MC |
288 | if (hdr_lun != task->sc->device->lun) |
289 | return 0; | |
3fe5ae8b MC |
290 | /* fall through */ |
291 | case ISCSI_TM_FUNC_TARGET_WARM_RESET: | |
5d12c05e MC |
292 | /* |
293 | * Fail all SCSI cmd PDUs | |
294 | */ | |
295 | if (opcode != ISCSI_OP_SCSI_DATA_OUT) { | |
296 | iscsi_conn_printk(KERN_INFO, conn, | |
a17037e7 | 297 | "task [op %x itt " |
3fe5ae8b | 298 | "0x%x/0x%x] " |
5d12c05e | 299 | "rejected.\n", |
a17037e7 VP |
300 | opcode, task->itt, |
301 | task->hdr_itt); | |
5d12c05e MC |
302 | return -EACCES; |
303 | } | |
304 | /* | |
305 | * And also all data-out PDUs in response to R2T | |
306 | * if fast_abort is set. | |
307 | */ | |
308 | if (conn->session->fast_abort) { | |
309 | iscsi_conn_printk(KERN_INFO, conn, | |
a17037e7 | 310 | "task [op %x itt " |
3fe5ae8b | 311 | "0x%x/0x%x] fast abort.\n", |
a17037e7 VP |
312 | opcode, task->itt, |
313 | task->hdr_itt); | |
5d12c05e MC |
314 | return -EACCES; |
315 | } | |
316 | break; | |
317 | case ISCSI_TM_FUNC_ABORT_TASK: | |
318 | /* | |
319 | * the caller has already checked if the task | |
320 | * they want to abort was in the pending queue so if | |
321 | * we are here the cmd pdu has gone out already, and | |
322 | * we will only hit this for data-outs | |
323 | */ | |
324 | if (opcode == ISCSI_OP_SCSI_DATA_OUT && | |
325 | task->hdr_itt == tmf->rtt) { | |
326 | ISCSI_DBG_SESSION(conn->session, | |
327 | "Preventing task %x/%x from sending " | |
328 | "data-out due to abort task in " | |
329 | "progress\n", task->itt, | |
330 | task->hdr_itt); | |
331 | return -EACCES; | |
332 | } | |
333 | break; | |
334 | } | |
335 | ||
336 | return 0; | |
337 | } | |
338 | ||
7996a778 MC |
339 | /** |
340 | * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu | |
9c19a7d0 | 341 | * @task: iscsi task |
7996a778 MC |
342 | * |
343 | * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set | |
344 | * fields like dlength or final based on how much data it sends | |
345 | */ | |
9c19a7d0 | 346 | static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task) |
7996a778 | 347 | { |
9c19a7d0 | 348 | struct iscsi_conn *conn = task->conn; |
7996a778 | 349 | struct iscsi_session *session = conn->session; |
9c19a7d0 | 350 | struct scsi_cmnd *sc = task->sc; |
12352183 | 351 | struct iscsi_scsi_req *hdr; |
d77e6535 | 352 | unsigned hdrlength, cmd_len, transfer_length; |
262ef636 | 353 | itt_t itt; |
004d6530 | 354 | int rc; |
7996a778 | 355 | |
5d12c05e MC |
356 | rc = iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_CMD); |
357 | if (rc) | |
358 | return rc; | |
359 | ||
184b57c6 MC |
360 | if (conn->session->tt->alloc_pdu) { |
361 | rc = conn->session->tt->alloc_pdu(task, ISCSI_OP_SCSI_CMD); | |
362 | if (rc) | |
363 | return rc; | |
364 | } | |
12352183 | 365 | hdr = (struct iscsi_scsi_req *)task->hdr; |
262ef636 | 366 | itt = hdr->itt; |
577577da MC |
367 | memset(hdr, 0, sizeof(*hdr)); |
368 | ||
2ff79d52 MC |
369 | if (session->tt->parse_pdu_itt) |
370 | hdr->itt = task->hdr_itt = itt; | |
371 | else | |
372 | hdr->itt = task->hdr_itt = build_itt(task->itt, | |
373 | task->conn->session->age); | |
9c19a7d0 MC |
374 | task->hdr_len = 0; |
375 | rc = iscsi_add_hdr(task, sizeof(*hdr)); | |
004d6530 BH |
376 | if (rc) |
377 | return rc; | |
a8ac6311 OK |
378 | hdr->opcode = ISCSI_OP_SCSI_CMD; |
379 | hdr->flags = ISCSI_ATTR_SIMPLE; | |
55bdabdf AG |
380 | int_to_scsilun(sc->device->lun, &hdr->lun); |
381 | task->lun = hdr->lun; | |
a8ac6311 | 382 | hdr->exp_statsn = cpu_to_be32(conn->exp_statsn); |
38d1c069 BH |
383 | cmd_len = sc->cmd_len; |
384 | if (cmd_len < ISCSI_CDB_SIZE) | |
385 | memset(&hdr->cdb[cmd_len], 0, ISCSI_CDB_SIZE - cmd_len); | |
386 | else if (cmd_len > ISCSI_CDB_SIZE) { | |
9c19a7d0 | 387 | rc = iscsi_prep_ecdb_ahs(task); |
38d1c069 BH |
388 | if (rc) |
389 | return rc; | |
390 | cmd_len = ISCSI_CDB_SIZE; | |
391 | } | |
392 | memcpy(hdr->cdb, sc->cmnd, cmd_len); | |
7996a778 | 393 | |
9c19a7d0 | 394 | task->imm_count = 0; |
c07d4444 BH |
395 | if (scsi_bidi_cmnd(sc)) { |
396 | hdr->flags |= ISCSI_FLAG_CMD_READ; | |
9c19a7d0 | 397 | rc = iscsi_prep_bidi_ahs(task); |
c07d4444 BH |
398 | if (rc) |
399 | return rc; | |
400 | } | |
55e51eda SG |
401 | |
402 | if (scsi_get_prot_op(sc) != SCSI_PROT_NORMAL) | |
403 | task->protected = true; | |
404 | ||
d77e6535 SG |
405 | transfer_length = scsi_transfer_length(sc); |
406 | hdr->data_length = cpu_to_be32(transfer_length); | |
7996a778 | 407 | if (sc->sc_data_direction == DMA_TO_DEVICE) { |
577577da MC |
408 | struct iscsi_r2t_info *r2t = &task->unsol_r2t; |
409 | ||
7996a778 MC |
410 | hdr->flags |= ISCSI_FLAG_CMD_WRITE; |
411 | /* | |
412 | * Write counters: | |
413 | * | |
414 | * imm_count bytes to be sent right after | |
415 | * SCSI PDU Header | |
416 | * | |
417 | * unsol_count bytes(as Data-Out) to be sent | |
418 | * without R2T ack right after | |
419 | * immediate data | |
420 | * | |
577577da | 421 | * r2t data_length bytes to be sent via R2T ack's |
7996a778 MC |
422 | * |
423 | * pad_count bytes to be sent as zero-padding | |
424 | */ | |
577577da | 425 | memset(r2t, 0, sizeof(*r2t)); |
7996a778 MC |
426 | |
427 | if (session->imm_data_en) { | |
d77e6535 | 428 | if (transfer_length >= session->first_burst) |
9c19a7d0 | 429 | task->imm_count = min(session->first_burst, |
7996a778 MC |
430 | conn->max_xmit_dlength); |
431 | else | |
d77e6535 SG |
432 | task->imm_count = min(transfer_length, |
433 | conn->max_xmit_dlength); | |
9c19a7d0 | 434 | hton24(hdr->dlength, task->imm_count); |
7996a778 | 435 | } else |
a8ac6311 | 436 | zero_data(hdr->dlength); |
7996a778 | 437 | |
ffd0436e | 438 | if (!session->initial_r2t_en) { |
d77e6535 SG |
439 | r2t->data_length = min(session->first_burst, |
440 | transfer_length) - | |
577577da MC |
441 | task->imm_count; |
442 | r2t->data_offset = task->imm_count; | |
443 | r2t->ttt = cpu_to_be32(ISCSI_RESERVED_TAG); | |
444 | r2t->exp_statsn = cpu_to_be32(conn->exp_statsn); | |
ffd0436e MC |
445 | } |
446 | ||
577577da | 447 | if (!task->unsol_r2t.data_length) |
7996a778 | 448 | /* No unsolicit Data-Out's */ |
a8ac6311 | 449 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; |
7996a778 | 450 | } else { |
7996a778 MC |
451 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; |
452 | zero_data(hdr->dlength); | |
453 | ||
454 | if (sc->sc_data_direction == DMA_FROM_DEVICE) | |
455 | hdr->flags |= ISCSI_FLAG_CMD_READ; | |
456 | } | |
457 | ||
004d6530 | 458 | /* calculate size of additional header segments (AHSs) */ |
9c19a7d0 | 459 | hdrlength = task->hdr_len - sizeof(*hdr); |
004d6530 BH |
460 | |
461 | WARN_ON(hdrlength & (ISCSI_PAD_LEN-1)); | |
462 | hdrlength /= ISCSI_PAD_LEN; | |
463 | ||
464 | WARN_ON(hdrlength >= 256); | |
465 | hdr->hlength = hdrlength & 0xFF; | |
96b1f96d | 466 | hdr->cmdsn = task->cmdsn = cpu_to_be32(session->cmdsn); |
004d6530 | 467 | |
577577da | 468 | if (session->tt->init_task && session->tt->init_task(task)) |
052d0144 MC |
469 | return -EIO; |
470 | ||
9c19a7d0 | 471 | task->state = ISCSI_TASK_RUNNING; |
d3305f34 | 472 | session->cmdsn++; |
77a23c21 | 473 | |
a8ac6311 | 474 | conn->scsicmd_pdus_cnt++; |
1b2c7af8 MC |
475 | ISCSI_DBG_SESSION(session, "iscsi prep [%s cid %d sc %p cdb 0x%x " |
476 | "itt 0x%x len %d bidi_len %d cmdsn %d win %d]\n", | |
477 | scsi_bidi_cmnd(sc) ? "bidirectional" : | |
478 | sc->sc_data_direction == DMA_TO_DEVICE ? | |
479 | "write" : "read", conn->id, sc, sc->cmnd[0], | |
d77e6535 | 480 | task->itt, transfer_length, |
1b2c7af8 MC |
481 | scsi_bidi_cmnd(sc) ? scsi_in(sc)->length : 0, |
482 | session->cmdsn, | |
483 | session->max_cmdsn - session->exp_cmdsn + 1); | |
004d6530 | 484 | return 0; |
7996a778 | 485 | } |
7996a778 MC |
486 | |
487 | /** | |
3bbaaad9 | 488 | * iscsi_free_task - free a task |
9c19a7d0 | 489 | * @task: iscsi cmd task |
7996a778 | 490 | * |
659743b0 | 491 | * Must be called with session back_lock. |
3e5c28ad MC |
492 | * This function returns the scsi command to scsi-ml or cleans |
493 | * up mgmt tasks then returns the task to the pool. | |
7996a778 | 494 | */ |
3bbaaad9 | 495 | static void iscsi_free_task(struct iscsi_task *task) |
7996a778 | 496 | { |
9c19a7d0 | 497 | struct iscsi_conn *conn = task->conn; |
c1635cb7 | 498 | struct iscsi_session *session = conn->session; |
9c19a7d0 | 499 | struct scsi_cmnd *sc = task->sc; |
f41d4721 | 500 | int oldstate = task->state; |
7996a778 | 501 | |
4421c9eb MC |
502 | ISCSI_DBG_SESSION(session, "freeing task itt 0x%x state %d sc %p\n", |
503 | task->itt, task->state, task->sc); | |
504 | ||
577577da | 505 | session->tt->cleanup_task(task); |
3bbaaad9 | 506 | task->state = ISCSI_TASK_FREE; |
9c19a7d0 | 507 | task->sc = NULL; |
3e5c28ad | 508 | /* |
9c19a7d0 | 509 | * login task is preallocated so do not free |
3e5c28ad | 510 | */ |
9c19a7d0 | 511 | if (conn->login_task == task) |
3e5c28ad MC |
512 | return; |
513 | ||
7acd72eb | 514 | kfifo_in(&session->cmdpool.queue, (void*)&task, sizeof(void*)); |
052d0144 | 515 | |
3e5c28ad | 516 | if (sc) { |
3e5c28ad MC |
517 | /* SCSI eh reuses commands to verify us */ |
518 | sc->SCp.ptr = NULL; | |
519 | /* | |
f41d4721 MC |
520 | * queue command may call this to free the task, so |
521 | * it will decide how to return sc to scsi-ml. | |
3e5c28ad | 522 | */ |
f41d4721 | 523 | if (oldstate != ISCSI_TASK_REQUEUE_SCSIQ) |
3e5c28ad MC |
524 | sc->scsi_done(sc); |
525 | } | |
7996a778 MC |
526 | } |
527 | ||
913e5bf4 | 528 | void __iscsi_get_task(struct iscsi_task *task) |
60ecebf5 | 529 | { |
6dc618cd | 530 | refcount_inc(&task->refcount); |
60ecebf5 | 531 | } |
913e5bf4 | 532 | EXPORT_SYMBOL_GPL(__iscsi_get_task); |
60ecebf5 | 533 | |
8eea2f55 | 534 | void __iscsi_put_task(struct iscsi_task *task) |
60ecebf5 | 535 | { |
6dc618cd | 536 | if (refcount_dec_and_test(&task->refcount)) |
3bbaaad9 | 537 | iscsi_free_task(task); |
60ecebf5 | 538 | } |
8eea2f55 | 539 | EXPORT_SYMBOL_GPL(__iscsi_put_task); |
60ecebf5 | 540 | |
9c19a7d0 | 541 | void iscsi_put_task(struct iscsi_task *task) |
3e5c28ad | 542 | { |
9c19a7d0 | 543 | struct iscsi_session *session = task->conn->session; |
3e5c28ad | 544 | |
659743b0 SP |
545 | /* regular RX path uses back_lock */ |
546 | spin_lock_bh(&session->back_lock); | |
9c19a7d0 | 547 | __iscsi_put_task(task); |
659743b0 | 548 | spin_unlock_bh(&session->back_lock); |
3e5c28ad | 549 | } |
9c19a7d0 | 550 | EXPORT_SYMBOL_GPL(iscsi_put_task); |
3e5c28ad | 551 | |
3bbaaad9 MC |
552 | /** |
553 | * iscsi_complete_task - finish a task | |
554 | * @task: iscsi cmd task | |
b3cd5050 | 555 | * @state: state to complete task with |
3bbaaad9 | 556 | * |
659743b0 | 557 | * Must be called with session back_lock. |
3bbaaad9 | 558 | */ |
b3cd5050 | 559 | static void iscsi_complete_task(struct iscsi_task *task, int state) |
3bbaaad9 MC |
560 | { |
561 | struct iscsi_conn *conn = task->conn; | |
562 | ||
4421c9eb MC |
563 | ISCSI_DBG_SESSION(conn->session, |
564 | "complete task itt 0x%x state %d sc %p\n", | |
565 | task->itt, task->state, task->sc); | |
b3cd5050 MC |
566 | if (task->state == ISCSI_TASK_COMPLETED || |
567 | task->state == ISCSI_TASK_ABRT_TMF || | |
f41d4721 MC |
568 | task->state == ISCSI_TASK_ABRT_SESS_RECOV || |
569 | task->state == ISCSI_TASK_REQUEUE_SCSIQ) | |
3bbaaad9 MC |
570 | return; |
571 | WARN_ON_ONCE(task->state == ISCSI_TASK_FREE); | |
b3cd5050 | 572 | task->state = state; |
3bbaaad9 | 573 | |
6f8830f5 CL |
574 | spin_lock_bh(&conn->taskqueuelock); |
575 | if (!list_empty(&task->running)) { | |
576 | pr_debug_once("%s while task on list", __func__); | |
3bbaaad9 | 577 | list_del_init(&task->running); |
6f8830f5 CL |
578 | } |
579 | spin_unlock_bh(&conn->taskqueuelock); | |
3bbaaad9 MC |
580 | |
581 | if (conn->task == task) | |
582 | conn->task = NULL; | |
583 | ||
584 | if (conn->ping_task == task) | |
585 | conn->ping_task = NULL; | |
586 | ||
587 | /* release get from queueing */ | |
588 | __iscsi_put_task(task); | |
589 | } | |
590 | ||
4c0ba5d2 MC |
591 | /** |
592 | * iscsi_complete_scsi_task - finish scsi task normally | |
593 | * @task: iscsi task for scsi cmd | |
594 | * @exp_cmdsn: expected cmd sn in cpu format | |
595 | * @max_cmdsn: max cmd sn in cpu format | |
596 | * | |
597 | * This is used when drivers do not need or cannot perform | |
598 | * lower level pdu processing. | |
599 | * | |
659743b0 | 600 | * Called with session back_lock |
4c0ba5d2 MC |
601 | */ |
602 | void iscsi_complete_scsi_task(struct iscsi_task *task, | |
603 | uint32_t exp_cmdsn, uint32_t max_cmdsn) | |
604 | { | |
605 | struct iscsi_conn *conn = task->conn; | |
606 | ||
607 | ISCSI_DBG_SESSION(conn->session, "[itt 0x%x]\n", task->itt); | |
608 | ||
609 | conn->last_recv = jiffies; | |
610 | __iscsi_update_cmdsn(conn->session, exp_cmdsn, max_cmdsn); | |
611 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); | |
612 | } | |
613 | EXPORT_SYMBOL_GPL(iscsi_complete_scsi_task); | |
614 | ||
615 | ||
b3a7ea8d | 616 | /* |
659743b0 | 617 | * session back_lock must be held and if not called for a task that is |
3bbaaad9 MC |
618 | * still pending or from the xmit thread, then xmit thread must |
619 | * be suspended. | |
b3a7ea8d | 620 | */ |
3bbaaad9 | 621 | static void fail_scsi_task(struct iscsi_task *task, int err) |
b3a7ea8d | 622 | { |
3bbaaad9 | 623 | struct iscsi_conn *conn = task->conn; |
b3a7ea8d | 624 | struct scsi_cmnd *sc; |
b3cd5050 | 625 | int state; |
b3a7ea8d | 626 | |
3bbaaad9 MC |
627 | /* |
628 | * if a command completes and we get a successful tmf response | |
629 | * we will hit this because the scsi eh abort code does not take | |
630 | * a ref to the task. | |
631 | */ | |
9c19a7d0 | 632 | sc = task->sc; |
b3a7ea8d MC |
633 | if (!sc) |
634 | return; | |
635 | ||
b3cd5050 | 636 | if (task->state == ISCSI_TASK_PENDING) { |
b3a7ea8d MC |
637 | /* |
638 | * cmd never made it to the xmit thread, so we should not count | |
639 | * the cmd in the sequencing | |
640 | */ | |
641 | conn->session->queued_cmdsn--; | |
b3cd5050 MC |
642 | /* it was never sent so just complete like normal */ |
643 | state = ISCSI_TASK_COMPLETED; | |
644 | } else if (err == DID_TRANSPORT_DISRUPTED) | |
645 | state = ISCSI_TASK_ABRT_SESS_RECOV; | |
646 | else | |
647 | state = ISCSI_TASK_ABRT_TMF; | |
b3a7ea8d | 648 | |
b3cd5050 | 649 | sc->result = err << 16; |
c07d4444 BH |
650 | if (!scsi_bidi_cmnd(sc)) |
651 | scsi_set_resid(sc, scsi_bufflen(sc)); | |
652 | else { | |
653 | scsi_out(sc)->resid = scsi_out(sc)->length; | |
654 | scsi_in(sc)->resid = scsi_in(sc)->length; | |
655 | } | |
3e5c28ad | 656 | |
659743b0 SP |
657 | /* regular RX path uses back_lock */ |
658 | spin_lock_bh(&conn->session->back_lock); | |
b3cd5050 | 659 | iscsi_complete_task(task, state); |
659743b0 | 660 | spin_unlock_bh(&conn->session->back_lock); |
b3a7ea8d MC |
661 | } |
662 | ||
3e5c28ad | 663 | static int iscsi_prep_mgmt_task(struct iscsi_conn *conn, |
9c19a7d0 | 664 | struct iscsi_task *task) |
052d0144 MC |
665 | { |
666 | struct iscsi_session *session = conn->session; | |
577577da | 667 | struct iscsi_hdr *hdr = task->hdr; |
052d0144 | 668 | struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr; |
4f704dc0 | 669 | uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK; |
052d0144 MC |
670 | |
671 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) | |
672 | return -ENOTCONN; | |
673 | ||
4f704dc0 | 674 | if (opcode != ISCSI_OP_LOGIN && opcode != ISCSI_OP_TEXT) |
052d0144 MC |
675 | nop->exp_statsn = cpu_to_be32(conn->exp_statsn); |
676 | /* | |
677 | * pre-format CmdSN for outgoing PDU. | |
678 | */ | |
679 | nop->cmdsn = cpu_to_be32(session->cmdsn); | |
680 | if (hdr->itt != RESERVED_ITT) { | |
052d0144 | 681 | /* |
4f704dc0 | 682 | * TODO: We always use immediate for normal session pdus. |
052d0144 MC |
683 | * If we start to send tmfs or nops as non-immediate then |
684 | * we should start checking the cmdsn numbers for mgmt tasks. | |
4f704dc0 MC |
685 | * |
686 | * During discovery sessions iscsid sends TEXT as non immediate, | |
687 | * but we always only send one PDU at a time. | |
052d0144 MC |
688 | */ |
689 | if (conn->c_stage == ISCSI_CONN_STARTED && | |
690 | !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { | |
691 | session->queued_cmdsn++; | |
692 | session->cmdsn++; | |
693 | } | |
694 | } | |
695 | ||
ae15f801 MC |
696 | if (session->tt->init_task && session->tt->init_task(task)) |
697 | return -EIO; | |
052d0144 MC |
698 | |
699 | if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT) | |
700 | session->state = ISCSI_STATE_LOGGING_OUT; | |
701 | ||
577577da | 702 | task->state = ISCSI_TASK_RUNNING; |
1b2c7af8 MC |
703 | ISCSI_DBG_SESSION(session, "mgmtpdu [op 0x%x hdr->itt 0x%x " |
704 | "datalen %d]\n", hdr->opcode & ISCSI_OPCODE_MASK, | |
705 | hdr->itt, task->data_count); | |
052d0144 MC |
706 | return 0; |
707 | } | |
708 | ||
9c19a7d0 | 709 | static struct iscsi_task * |
f6d5180c MC |
710 | __iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
711 | char *data, uint32_t data_size) | |
712 | { | |
713 | struct iscsi_session *session = conn->session; | |
1336aed1 | 714 | struct iscsi_host *ihost = shost_priv(session->host); |
4f704dc0 | 715 | uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK; |
9c19a7d0 | 716 | struct iscsi_task *task; |
262ef636 | 717 | itt_t itt; |
f6d5180c MC |
718 | |
719 | if (session->state == ISCSI_STATE_TERMINATE) | |
720 | return NULL; | |
721 | ||
4f704dc0 | 722 | if (opcode == ISCSI_OP_LOGIN || opcode == ISCSI_OP_TEXT) { |
f6d5180c MC |
723 | /* |
724 | * Login and Text are sent serially, in | |
725 | * request-followed-by-response sequence. | |
3e5c28ad MC |
726 | * Same task can be used. Same ITT must be used. |
727 | * Note that login_task is preallocated at conn_create(). | |
f6d5180c | 728 | */ |
4f704dc0 MC |
729 | if (conn->login_task->state != ISCSI_TASK_FREE) { |
730 | iscsi_conn_printk(KERN_ERR, conn, "Login/Text in " | |
731 | "progress. Cannot start new task.\n"); | |
732 | return NULL; | |
733 | } | |
734 | ||
cbaa4221 MC |
735 | if (data_size > ISCSI_DEF_MAX_RECV_SEG_LEN) { |
736 | iscsi_conn_printk(KERN_ERR, conn, "Invalid buffer len of %u for login task. Max len is %u\n", data_size, ISCSI_DEF_MAX_RECV_SEG_LEN); | |
737 | return NULL; | |
738 | } | |
739 | ||
9c19a7d0 | 740 | task = conn->login_task; |
4f704dc0 | 741 | } else { |
26013ad4 MC |
742 | if (session->state != ISCSI_STATE_LOGGED_IN) |
743 | return NULL; | |
744 | ||
cbaa4221 MC |
745 | if (data_size != 0) { |
746 | iscsi_conn_printk(KERN_ERR, conn, "Can not send data buffer of len %u for op 0x%x\n", data_size, opcode); | |
747 | return NULL; | |
748 | } | |
749 | ||
f6d5180c MC |
750 | BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE); |
751 | BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED); | |
752 | ||
7acd72eb | 753 | if (!kfifo_out(&session->cmdpool.queue, |
9c19a7d0 | 754 | (void*)&task, sizeof(void*))) |
f6d5180c MC |
755 | return NULL; |
756 | } | |
3e5c28ad MC |
757 | /* |
758 | * released in complete pdu for task we expect a response for, and | |
759 | * released by the lld when it has transmitted the task for | |
760 | * pdus we do not expect a response for. | |
761 | */ | |
6dc618cd | 762 | refcount_set(&task->refcount, 1); |
9c19a7d0 MC |
763 | task->conn = conn; |
764 | task->sc = NULL; | |
3bbaaad9 MC |
765 | INIT_LIST_HEAD(&task->running); |
766 | task->state = ISCSI_TASK_PENDING; | |
f6d5180c MC |
767 | |
768 | if (data_size) { | |
9c19a7d0 MC |
769 | memcpy(task->data, data, data_size); |
770 | task->data_count = data_size; | |
f6d5180c | 771 | } else |
9c19a7d0 | 772 | task->data_count = 0; |
f6d5180c | 773 | |
184b57c6 MC |
774 | if (conn->session->tt->alloc_pdu) { |
775 | if (conn->session->tt->alloc_pdu(task, hdr->opcode)) { | |
776 | iscsi_conn_printk(KERN_ERR, conn, "Could not allocate " | |
777 | "pdu for mgmt task.\n"); | |
3bbaaad9 | 778 | goto free_task; |
184b57c6 | 779 | } |
577577da | 780 | } |
184b57c6 | 781 | |
262ef636 | 782 | itt = task->hdr->itt; |
577577da | 783 | task->hdr_len = sizeof(struct iscsi_hdr); |
9c19a7d0 | 784 | memcpy(task->hdr, hdr, sizeof(struct iscsi_hdr)); |
262ef636 MC |
785 | |
786 | if (hdr->itt != RESERVED_ITT) { | |
787 | if (session->tt->parse_pdu_itt) | |
788 | task->hdr->itt = itt; | |
789 | else | |
790 | task->hdr->itt = build_itt(task->itt, | |
791 | task->conn->session->age); | |
792 | } | |
793 | ||
1336aed1 | 794 | if (!ihost->workq) { |
577577da MC |
795 | if (iscsi_prep_mgmt_task(conn, task)) |
796 | goto free_task; | |
052d0144 | 797 | |
9c19a7d0 | 798 | if (session->tt->xmit_task(task)) |
577577da | 799 | goto free_task; |
3bbaaad9 | 800 | } else { |
6f8830f5 | 801 | spin_lock_bh(&conn->taskqueuelock); |
3bbaaad9 | 802 | list_add_tail(&task->running, &conn->mgmtqueue); |
6f8830f5 | 803 | spin_unlock_bh(&conn->taskqueuelock); |
32ae763e | 804 | iscsi_conn_queue_work(conn); |
3bbaaad9 | 805 | } |
052d0144 | 806 | |
9c19a7d0 | 807 | return task; |
577577da MC |
808 | |
809 | free_task: | |
659743b0 | 810 | /* regular RX path uses back_lock */ |
4fa50799 | 811 | spin_lock(&session->back_lock); |
577577da | 812 | __iscsi_put_task(task); |
4fa50799 | 813 | spin_unlock(&session->back_lock); |
577577da | 814 | return NULL; |
f6d5180c MC |
815 | } |
816 | ||
817 | int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr, | |
818 | char *data, uint32_t data_size) | |
819 | { | |
820 | struct iscsi_conn *conn = cls_conn->dd_data; | |
821 | struct iscsi_session *session = conn->session; | |
822 | int err = 0; | |
823 | ||
659743b0 | 824 | spin_lock_bh(&session->frwd_lock); |
f6d5180c MC |
825 | if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size)) |
826 | err = -EPERM; | |
659743b0 | 827 | spin_unlock_bh(&session->frwd_lock); |
f6d5180c MC |
828 | return err; |
829 | } | |
830 | EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu); | |
831 | ||
7996a778 MC |
832 | /** |
833 | * iscsi_cmd_rsp - SCSI Command Response processing | |
834 | * @conn: iscsi connection | |
835 | * @hdr: iscsi header | |
9c19a7d0 | 836 | * @task: scsi command task |
7996a778 MC |
837 | * @data: cmd data buffer |
838 | * @datalen: len of buffer | |
839 | * | |
840 | * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and | |
9c19a7d0 | 841 | * then completes the command and task. |
7996a778 | 842 | **/ |
77a23c21 | 843 | static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
9c19a7d0 | 844 | struct iscsi_task *task, char *data, |
77a23c21 | 845 | int datalen) |
7996a778 | 846 | { |
12352183 | 847 | struct iscsi_scsi_rsp *rhdr = (struct iscsi_scsi_rsp *)hdr; |
7996a778 | 848 | struct iscsi_session *session = conn->session; |
9c19a7d0 | 849 | struct scsi_cmnd *sc = task->sc; |
7996a778 | 850 | |
77a23c21 | 851 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr); |
7996a778 MC |
852 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; |
853 | ||
854 | sc->result = (DID_OK << 16) | rhdr->cmd_status; | |
855 | ||
55e51eda SG |
856 | if (task->protected) { |
857 | sector_t sector; | |
858 | u8 ascq; | |
859 | ||
860 | /** | |
861 | * Transports that didn't implement check_protection | |
862 | * callback but still published T10-PI support to scsi-mid | |
863 | * deserve this BUG_ON. | |
864 | **/ | |
865 | BUG_ON(!session->tt->check_protection); | |
866 | ||
867 | ascq = session->tt->check_protection(task, §or); | |
868 | if (ascq) { | |
869 | sc->result = DRIVER_SENSE << 24 | | |
870 | SAM_STAT_CHECK_CONDITION; | |
871 | scsi_build_sense_buffer(1, sc->sense_buffer, | |
872 | ILLEGAL_REQUEST, 0x10, ascq); | |
a73c2a2f SG |
873 | scsi_set_sense_information(sc->sense_buffer, |
874 | SCSI_SENSE_BUFFERSIZE, | |
875 | sector); | |
55e51eda SG |
876 | goto out; |
877 | } | |
878 | } | |
879 | ||
7996a778 MC |
880 | if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) { |
881 | sc->result = DID_ERROR << 16; | |
882 | goto out; | |
883 | } | |
884 | ||
885 | if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) { | |
9b80cb4b | 886 | uint16_t senselen; |
7996a778 MC |
887 | |
888 | if (datalen < 2) { | |
889 | invalid_datalen: | |
322d739d MC |
890 | iscsi_conn_printk(KERN_ERR, conn, |
891 | "Got CHECK_CONDITION but invalid data " | |
892 | "buffer size of %d\n", datalen); | |
7996a778 MC |
893 | sc->result = DID_BAD_TARGET << 16; |
894 | goto out; | |
895 | } | |
896 | ||
8f333991 | 897 | senselen = get_unaligned_be16(data); |
7996a778 MC |
898 | if (datalen < senselen) |
899 | goto invalid_datalen; | |
900 | ||
901 | memcpy(sc->sense_buffer, data + 2, | |
9b80cb4b | 902 | min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE)); |
1b2c7af8 MC |
903 | ISCSI_DBG_SESSION(session, "copied %d bytes of sense\n", |
904 | min_t(uint16_t, senselen, | |
905 | SCSI_SENSE_BUFFERSIZE)); | |
7996a778 MC |
906 | } |
907 | ||
c07d4444 BH |
908 | if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW | |
909 | ISCSI_FLAG_CMD_BIDI_OVERFLOW)) { | |
910 | int res_count = be32_to_cpu(rhdr->bi_residual_count); | |
911 | ||
912 | if (scsi_bidi_cmnd(sc) && res_count > 0 && | |
913 | (rhdr->flags & ISCSI_FLAG_CMD_BIDI_OVERFLOW || | |
914 | res_count <= scsi_in(sc)->length)) | |
915 | scsi_in(sc)->resid = res_count; | |
916 | else | |
917 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
918 | } | |
919 | ||
7207fea4 BH |
920 | if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW | |
921 | ISCSI_FLAG_CMD_OVERFLOW)) { | |
7996a778 MC |
922 | int res_count = be32_to_cpu(rhdr->residual_count); |
923 | ||
7207fea4 BH |
924 | if (res_count > 0 && |
925 | (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || | |
926 | res_count <= scsi_bufflen(sc))) | |
c07d4444 | 927 | /* write side for bidi or uni-io set_resid */ |
1c138991 | 928 | scsi_set_resid(sc, res_count); |
7996a778 MC |
929 | else |
930 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
c07d4444 | 931 | } |
7996a778 | 932 | out: |
3bbaaad9 | 933 | ISCSI_DBG_SESSION(session, "cmd rsp done [sc %p res %d itt 0x%x]\n", |
1b2c7af8 | 934 | sc, sc->result, task->itt); |
7996a778 | 935 | conn->scsirsp_pdus_cnt++; |
b3cd5050 | 936 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); |
7996a778 MC |
937 | } |
938 | ||
1d9edf02 MC |
939 | /** |
940 | * iscsi_data_in_rsp - SCSI Data-In Response processing | |
941 | * @conn: iscsi connection | |
942 | * @hdr: iscsi pdu | |
943 | * @task: scsi command task | |
944 | **/ | |
945 | static void | |
946 | iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
947 | struct iscsi_task *task) | |
948 | { | |
949 | struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)hdr; | |
950 | struct scsi_cmnd *sc = task->sc; | |
951 | ||
952 | if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS)) | |
953 | return; | |
954 | ||
edbc9aa0 | 955 | iscsi_update_cmdsn(conn->session, (struct iscsi_nopin *)hdr); |
1d9edf02 MC |
956 | sc->result = (DID_OK << 16) | rhdr->cmd_status; |
957 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; | |
958 | if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW | | |
959 | ISCSI_FLAG_DATA_OVERFLOW)) { | |
960 | int res_count = be32_to_cpu(rhdr->residual_count); | |
961 | ||
962 | if (res_count > 0 && | |
963 | (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || | |
964 | res_count <= scsi_in(sc)->length)) | |
965 | scsi_in(sc)->resid = res_count; | |
966 | else | |
967 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
968 | } | |
969 | ||
3bbaaad9 MC |
970 | ISCSI_DBG_SESSION(conn->session, "data in with status done " |
971 | "[sc %p res %d itt 0x%x]\n", | |
972 | sc, sc->result, task->itt); | |
1d9edf02 | 973 | conn->scsirsp_pdus_cnt++; |
b3cd5050 | 974 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); |
1d9edf02 MC |
975 | } |
976 | ||
7ea8b828 MC |
977 | static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr) |
978 | { | |
979 | struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr; | |
980 | ||
981 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
982 | conn->tmfrsp_pdus_cnt++; | |
983 | ||
843c0a8a | 984 | if (conn->tmf_state != TMF_QUEUED) |
7ea8b828 MC |
985 | return; |
986 | ||
987 | if (tmf->response == ISCSI_TMF_RSP_COMPLETE) | |
843c0a8a | 988 | conn->tmf_state = TMF_SUCCESS; |
7ea8b828 | 989 | else if (tmf->response == ISCSI_TMF_RSP_NO_TASK) |
843c0a8a | 990 | conn->tmf_state = TMF_NOT_FOUND; |
7ea8b828 | 991 | else |
843c0a8a | 992 | conn->tmf_state = TMF_FAILED; |
7ea8b828 MC |
993 | wake_up(&conn->ehwait); |
994 | } | |
995 | ||
52f5664a | 996 | static int iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr) |
f6d5180c MC |
997 | { |
998 | struct iscsi_nopout hdr; | |
9c19a7d0 | 999 | struct iscsi_task *task; |
f6d5180c | 1000 | |
9c19a7d0 | 1001 | if (!rhdr && conn->ping_task) |
52f5664a | 1002 | return -EINVAL; |
f6d5180c MC |
1003 | |
1004 | memset(&hdr, 0, sizeof(struct iscsi_nopout)); | |
1005 | hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE; | |
1006 | hdr.flags = ISCSI_FLAG_CMD_FINAL; | |
1007 | ||
1008 | if (rhdr) { | |
55bdabdf | 1009 | hdr.lun = rhdr->lun; |
f6d5180c MC |
1010 | hdr.ttt = rhdr->ttt; |
1011 | hdr.itt = RESERVED_ITT; | |
1012 | } else | |
1013 | hdr.ttt = RESERVED_ITT; | |
1014 | ||
9c19a7d0 | 1015 | task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0); |
52f5664a | 1016 | if (!task) { |
322d739d | 1017 | iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n"); |
52f5664a AN |
1018 | return -EIO; |
1019 | } else if (!rhdr) { | |
d3acf022 MC |
1020 | /* only track our nops */ |
1021 | conn->ping_task = task; | |
1022 | conn->last_ping = jiffies; | |
1023 | } | |
52f5664a AN |
1024 | |
1025 | return 0; | |
f6d5180c MC |
1026 | } |
1027 | ||
8afa1439 MC |
1028 | static int iscsi_nop_out_rsp(struct iscsi_task *task, |
1029 | struct iscsi_nopin *nop, char *data, int datalen) | |
1030 | { | |
1031 | struct iscsi_conn *conn = task->conn; | |
1032 | int rc = 0; | |
1033 | ||
1034 | if (conn->ping_task != task) { | |
1035 | /* | |
1036 | * If this is not in response to one of our | |
1037 | * nops then it must be from userspace. | |
1038 | */ | |
1039 | if (iscsi_recv_pdu(conn->cls_conn, (struct iscsi_hdr *)nop, | |
1040 | data, datalen)) | |
1041 | rc = ISCSI_ERR_CONN_FAILED; | |
1042 | } else | |
1043 | mod_timer(&conn->transport_timer, jiffies + conn->recv_timeout); | |
1044 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); | |
1045 | return rc; | |
1046 | } | |
1047 | ||
62f38300 MC |
1048 | static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
1049 | char *data, int datalen) | |
1050 | { | |
1051 | struct iscsi_reject *reject = (struct iscsi_reject *)hdr; | |
1052 | struct iscsi_hdr rejected_pdu; | |
8afa1439 | 1053 | int opcode, rc = 0; |
62f38300 MC |
1054 | |
1055 | conn->exp_statsn = be32_to_cpu(reject->statsn) + 1; | |
1056 | ||
8afa1439 MC |
1057 | if (ntoh24(reject->dlength) > datalen || |
1058 | ntoh24(reject->dlength) < sizeof(struct iscsi_hdr)) { | |
1059 | iscsi_conn_printk(KERN_ERR, conn, "Cannot handle rejected " | |
1060 | "pdu. Invalid data length (pdu dlength " | |
1061 | "%u, datalen %d\n", ntoh24(reject->dlength), | |
1062 | datalen); | |
1063 | return ISCSI_ERR_PROTO; | |
1064 | } | |
1065 | memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr)); | |
1066 | opcode = rejected_pdu.opcode & ISCSI_OPCODE_MASK; | |
1067 | ||
1068 | switch (reject->reason) { | |
1069 | case ISCSI_REASON_DATA_DIGEST_ERROR: | |
1070 | iscsi_conn_printk(KERN_ERR, conn, | |
1071 | "pdu (op 0x%x itt 0x%x) rejected " | |
1072 | "due to DataDigest error.\n", | |
e5dbbe27 | 1073 | opcode, rejected_pdu.itt); |
8afa1439 MC |
1074 | break; |
1075 | case ISCSI_REASON_IMM_CMD_REJECT: | |
1076 | iscsi_conn_printk(KERN_ERR, conn, | |
1077 | "pdu (op 0x%x itt 0x%x) rejected. Too many " | |
1078 | "immediate commands.\n", | |
e5dbbe27 | 1079 | opcode, rejected_pdu.itt); |
8afa1439 MC |
1080 | /* |
1081 | * We only send one TMF at a time so if the target could not | |
1082 | * handle it, then it should get fixed (RFC mandates that | |
1083 | * a target can handle one immediate TMF per conn). | |
1084 | * | |
1085 | * For nops-outs, we could have sent more than one if | |
1086 | * the target is sending us lots of nop-ins | |
1087 | */ | |
1088 | if (opcode != ISCSI_OP_NOOP_OUT) | |
1089 | return 0; | |
62f38300 | 1090 | |
4dec6a8f | 1091 | if (rejected_pdu.itt == cpu_to_be32(ISCSI_RESERVED_TAG)) { |
8afa1439 MC |
1092 | /* |
1093 | * nop-out in response to target's nop-out rejected. | |
1094 | * Just resend. | |
1095 | */ | |
659743b0 SP |
1096 | /* In RX path we are under back lock */ |
1097 | spin_unlock(&conn->session->back_lock); | |
1098 | spin_lock(&conn->session->frwd_lock); | |
8afa1439 MC |
1099 | iscsi_send_nopout(conn, |
1100 | (struct iscsi_nopin*)&rejected_pdu); | |
659743b0 SP |
1101 | spin_unlock(&conn->session->frwd_lock); |
1102 | spin_lock(&conn->session->back_lock); | |
1103 | } else { | |
8afa1439 MC |
1104 | struct iscsi_task *task; |
1105 | /* | |
1106 | * Our nop as ping got dropped. We know the target | |
1107 | * and transport are ok so just clean up | |
1108 | */ | |
1109 | task = iscsi_itt_to_task(conn, rejected_pdu.itt); | |
1110 | if (!task) { | |
1111 | iscsi_conn_printk(KERN_ERR, conn, | |
1112 | "Invalid pdu reject. Could " | |
1113 | "not lookup rejected task.\n"); | |
1114 | rc = ISCSI_ERR_BAD_ITT; | |
1115 | } else | |
1116 | rc = iscsi_nop_out_rsp(task, | |
1117 | (struct iscsi_nopin*)&rejected_pdu, | |
1118 | NULL, 0); | |
62f38300 | 1119 | } |
8afa1439 MC |
1120 | break; |
1121 | default: | |
1122 | iscsi_conn_printk(KERN_ERR, conn, | |
1123 | "pdu (op 0x%x itt 0x%x) rejected. Reason " | |
e5dbbe27 VC |
1124 | "code 0x%x\n", rejected_pdu.opcode, |
1125 | rejected_pdu.itt, reject->reason); | |
8afa1439 | 1126 | break; |
62f38300 | 1127 | } |
8afa1439 | 1128 | return rc; |
62f38300 MC |
1129 | } |
1130 | ||
913e5bf4 MC |
1131 | /** |
1132 | * iscsi_itt_to_task - look up task by itt | |
1133 | * @conn: iscsi connection | |
1134 | * @itt: itt | |
1135 | * | |
1136 | * This should be used for mgmt tasks like login and nops, or if | |
1137 | * the LDD's itt space does not include the session age. | |
1138 | * | |
659743b0 | 1139 | * The session back_lock must be held. |
913e5bf4 | 1140 | */ |
8f9256ce | 1141 | struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *conn, itt_t itt) |
913e5bf4 MC |
1142 | { |
1143 | struct iscsi_session *session = conn->session; | |
262ef636 | 1144 | int i; |
913e5bf4 MC |
1145 | |
1146 | if (itt == RESERVED_ITT) | |
1147 | return NULL; | |
1148 | ||
262ef636 MC |
1149 | if (session->tt->parse_pdu_itt) |
1150 | session->tt->parse_pdu_itt(conn, itt, &i, NULL); | |
1151 | else | |
1152 | i = get_itt(itt); | |
913e5bf4 MC |
1153 | if (i >= session->cmds_max) |
1154 | return NULL; | |
1155 | ||
1156 | return session->cmds[i]; | |
1157 | } | |
8f9256ce | 1158 | EXPORT_SYMBOL_GPL(iscsi_itt_to_task); |
913e5bf4 | 1159 | |
7996a778 MC |
1160 | /** |
1161 | * __iscsi_complete_pdu - complete pdu | |
1162 | * @conn: iscsi conn | |
1163 | * @hdr: iscsi header | |
1164 | * @data: data buffer | |
1165 | * @datalen: len of data buffer | |
1166 | * | |
1167 | * Completes pdu processing by freeing any resources allocated at | |
659743b0 | 1168 | * queuecommand or send generic. session back_lock must be held and verify |
7996a778 MC |
1169 | * itt must have been called. |
1170 | */ | |
913e5bf4 MC |
1171 | int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
1172 | char *data, int datalen) | |
7996a778 MC |
1173 | { |
1174 | struct iscsi_session *session = conn->session; | |
1175 | int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0; | |
9c19a7d0 | 1176 | struct iscsi_task *task; |
7996a778 MC |
1177 | uint32_t itt; |
1178 | ||
f6d5180c | 1179 | conn->last_recv = jiffies; |
0af967f5 MC |
1180 | rc = iscsi_verify_itt(conn, hdr->itt); |
1181 | if (rc) | |
1182 | return rc; | |
1183 | ||
b4377356 AV |
1184 | if (hdr->itt != RESERVED_ITT) |
1185 | itt = get_itt(hdr->itt); | |
7996a778 | 1186 | else |
b4377356 | 1187 | itt = ~0U; |
7996a778 | 1188 | |
1b2c7af8 MC |
1189 | ISCSI_DBG_SESSION(session, "[op 0x%x cid %d itt 0x%x len %d]\n", |
1190 | opcode, conn->id, itt, datalen); | |
7996a778 | 1191 | |
3e5c28ad | 1192 | if (itt == ~0U) { |
77a23c21 | 1193 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); |
62f38300 | 1194 | |
7996a778 MC |
1195 | switch(opcode) { |
1196 | case ISCSI_OP_NOOP_IN: | |
40527afe | 1197 | if (datalen) { |
7996a778 | 1198 | rc = ISCSI_ERR_PROTO; |
40527afe MC |
1199 | break; |
1200 | } | |
1201 | ||
b4377356 | 1202 | if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG)) |
40527afe MC |
1203 | break; |
1204 | ||
659743b0 SP |
1205 | /* In RX path we are under back lock */ |
1206 | spin_unlock(&session->back_lock); | |
1207 | spin_lock(&session->frwd_lock); | |
f6d5180c | 1208 | iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr); |
659743b0 SP |
1209 | spin_unlock(&session->frwd_lock); |
1210 | spin_lock(&session->back_lock); | |
7996a778 MC |
1211 | break; |
1212 | case ISCSI_OP_REJECT: | |
62f38300 MC |
1213 | rc = iscsi_handle_reject(conn, hdr, data, datalen); |
1214 | break; | |
7996a778 | 1215 | case ISCSI_OP_ASYNC_EVENT: |
8d2860b3 | 1216 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; |
5831c737 MC |
1217 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) |
1218 | rc = ISCSI_ERR_CONN_FAILED; | |
7996a778 MC |
1219 | break; |
1220 | default: | |
1221 | rc = ISCSI_ERR_BAD_OPCODE; | |
1222 | break; | |
1223 | } | |
3e5c28ad MC |
1224 | goto out; |
1225 | } | |
1226 | ||
3e5c28ad MC |
1227 | switch(opcode) { |
1228 | case ISCSI_OP_SCSI_CMD_RSP: | |
913e5bf4 MC |
1229 | case ISCSI_OP_SCSI_DATA_IN: |
1230 | task = iscsi_itt_to_ctask(conn, hdr->itt); | |
1231 | if (!task) | |
1232 | return ISCSI_ERR_BAD_ITT; | |
d355e57d | 1233 | task->last_xfer = jiffies; |
913e5bf4 MC |
1234 | break; |
1235 | case ISCSI_OP_R2T: | |
1236 | /* | |
1237 | * LLD handles R2Ts if they need to. | |
1238 | */ | |
1239 | return 0; | |
1240 | case ISCSI_OP_LOGOUT_RSP: | |
1241 | case ISCSI_OP_LOGIN_RSP: | |
1242 | case ISCSI_OP_TEXT_RSP: | |
1243 | case ISCSI_OP_SCSI_TMFUNC_RSP: | |
1244 | case ISCSI_OP_NOOP_IN: | |
1245 | task = iscsi_itt_to_task(conn, hdr->itt); | |
1246 | if (!task) | |
1247 | return ISCSI_ERR_BAD_ITT; | |
1248 | break; | |
1249 | default: | |
1250 | return ISCSI_ERR_BAD_OPCODE; | |
1251 | } | |
1252 | ||
1253 | switch(opcode) { | |
1254 | case ISCSI_OP_SCSI_CMD_RSP: | |
9c19a7d0 | 1255 | iscsi_scsi_cmd_rsp(conn, hdr, task, data, datalen); |
3e5c28ad MC |
1256 | break; |
1257 | case ISCSI_OP_SCSI_DATA_IN: | |
1d9edf02 | 1258 | iscsi_data_in_rsp(conn, hdr, task); |
3e5c28ad | 1259 | break; |
3e5c28ad MC |
1260 | case ISCSI_OP_LOGOUT_RSP: |
1261 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
1262 | if (datalen) { | |
1263 | rc = ISCSI_ERR_PROTO; | |
1264 | break; | |
1265 | } | |
1266 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
1267 | goto recv_pdu; | |
1268 | case ISCSI_OP_LOGIN_RSP: | |
1269 | case ISCSI_OP_TEXT_RSP: | |
1270 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
1271 | /* | |
1272 | * login related PDU's exp_statsn is handled in | |
1273 | * userspace | |
1274 | */ | |
1275 | goto recv_pdu; | |
1276 | case ISCSI_OP_SCSI_TMFUNC_RSP: | |
1277 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
1278 | if (datalen) { | |
1279 | rc = ISCSI_ERR_PROTO; | |
1280 | break; | |
1281 | } | |
1282 | ||
1283 | iscsi_tmf_rsp(conn, hdr); | |
b3cd5050 | 1284 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); |
3e5c28ad MC |
1285 | break; |
1286 | case ISCSI_OP_NOOP_IN: | |
1287 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
1288 | if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) { | |
1289 | rc = ISCSI_ERR_PROTO; | |
1290 | break; | |
1291 | } | |
1292 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
1293 | ||
8afa1439 MC |
1294 | rc = iscsi_nop_out_rsp(task, (struct iscsi_nopin*)hdr, |
1295 | data, datalen); | |
3e5c28ad MC |
1296 | break; |
1297 | default: | |
1298 | rc = ISCSI_ERR_BAD_OPCODE; | |
1299 | break; | |
1300 | } | |
7996a778 | 1301 | |
3e5c28ad MC |
1302 | out: |
1303 | return rc; | |
1304 | recv_pdu: | |
1305 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) | |
1306 | rc = ISCSI_ERR_CONN_FAILED; | |
b3cd5050 | 1307 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); |
7996a778 MC |
1308 | return rc; |
1309 | } | |
913e5bf4 | 1310 | EXPORT_SYMBOL_GPL(__iscsi_complete_pdu); |
7996a778 MC |
1311 | |
1312 | int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
1313 | char *data, int datalen) | |
1314 | { | |
1315 | int rc; | |
1316 | ||
659743b0 | 1317 | spin_lock(&conn->session->back_lock); |
7996a778 | 1318 | rc = __iscsi_complete_pdu(conn, hdr, data, datalen); |
659743b0 | 1319 | spin_unlock(&conn->session->back_lock); |
7996a778 MC |
1320 | return rc; |
1321 | } | |
1322 | EXPORT_SYMBOL_GPL(iscsi_complete_pdu); | |
1323 | ||
0af967f5 | 1324 | int iscsi_verify_itt(struct iscsi_conn *conn, itt_t itt) |
7996a778 MC |
1325 | { |
1326 | struct iscsi_session *session = conn->session; | |
262ef636 | 1327 | int age = 0, i = 0; |
7996a778 | 1328 | |
0af967f5 MC |
1329 | if (itt == RESERVED_ITT) |
1330 | return 0; | |
7996a778 | 1331 | |
262ef636 MC |
1332 | if (session->tt->parse_pdu_itt) |
1333 | session->tt->parse_pdu_itt(conn, itt, &i, &age); | |
1334 | else { | |
1335 | i = get_itt(itt); | |
1336 | age = ((__force u32)itt >> ISCSI_AGE_SHIFT) & ISCSI_AGE_MASK; | |
1337 | } | |
1338 | ||
1339 | if (age != session->age) { | |
0af967f5 MC |
1340 | iscsi_conn_printk(KERN_ERR, conn, |
1341 | "received itt %x expected session age (%x)\n", | |
913e5bf4 | 1342 | (__force u32)itt, session->age); |
0af967f5 MC |
1343 | return ISCSI_ERR_BAD_ITT; |
1344 | } | |
7996a778 | 1345 | |
3e5c28ad MC |
1346 | if (i >= session->cmds_max) { |
1347 | iscsi_conn_printk(KERN_ERR, conn, | |
1348 | "received invalid itt index %u (max cmds " | |
1349 | "%u.\n", i, session->cmds_max); | |
1350 | return ISCSI_ERR_BAD_ITT; | |
7996a778 | 1351 | } |
7996a778 MC |
1352 | return 0; |
1353 | } | |
1354 | EXPORT_SYMBOL_GPL(iscsi_verify_itt); | |
1355 | ||
913e5bf4 MC |
1356 | /** |
1357 | * iscsi_itt_to_ctask - look up ctask by itt | |
1358 | * @conn: iscsi connection | |
1359 | * @itt: itt | |
1360 | * | |
1361 | * This should be used for cmd tasks. | |
1362 | * | |
659743b0 | 1363 | * The session back_lock must be held. |
913e5bf4 MC |
1364 | */ |
1365 | struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *conn, itt_t itt) | |
0af967f5 | 1366 | { |
9c19a7d0 | 1367 | struct iscsi_task *task; |
0af967f5 MC |
1368 | |
1369 | if (iscsi_verify_itt(conn, itt)) | |
1370 | return NULL; | |
1371 | ||
913e5bf4 MC |
1372 | task = iscsi_itt_to_task(conn, itt); |
1373 | if (!task || !task->sc) | |
0af967f5 MC |
1374 | return NULL; |
1375 | ||
913e5bf4 MC |
1376 | if (task->sc->SCp.phase != conn->session->age) { |
1377 | iscsi_session_printk(KERN_ERR, conn->session, | |
1378 | "task's session age %d, expected %d\n", | |
1379 | task->sc->SCp.phase, conn->session->age); | |
0af967f5 | 1380 | return NULL; |
913e5bf4 | 1381 | } |
0af967f5 | 1382 | |
9c19a7d0 | 1383 | return task; |
0af967f5 MC |
1384 | } |
1385 | EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask); | |
1386 | ||
40a06e75 | 1387 | void iscsi_session_failure(struct iscsi_session *session, |
e5bd7b54 MC |
1388 | enum iscsi_err err) |
1389 | { | |
e5bd7b54 MC |
1390 | struct iscsi_conn *conn; |
1391 | struct device *dev; | |
e5bd7b54 | 1392 | |
659743b0 | 1393 | spin_lock_bh(&session->frwd_lock); |
e5bd7b54 MC |
1394 | conn = session->leadconn; |
1395 | if (session->state == ISCSI_STATE_TERMINATE || !conn) { | |
659743b0 | 1396 | spin_unlock_bh(&session->frwd_lock); |
e5bd7b54 MC |
1397 | return; |
1398 | } | |
1399 | ||
1400 | dev = get_device(&conn->cls_conn->dev); | |
659743b0 | 1401 | spin_unlock_bh(&session->frwd_lock); |
e5bd7b54 MC |
1402 | if (!dev) |
1403 | return; | |
1404 | /* | |
1405 | * if the host is being removed bypass the connection | |
1406 | * recovery initialization because we are going to kill | |
1407 | * the session. | |
1408 | */ | |
1409 | if (err == ISCSI_ERR_INVALID_HOST) | |
1410 | iscsi_conn_error_event(conn->cls_conn, err); | |
1411 | else | |
1412 | iscsi_conn_failure(conn, err); | |
1413 | put_device(dev); | |
1414 | } | |
1415 | EXPORT_SYMBOL_GPL(iscsi_session_failure); | |
1416 | ||
7996a778 MC |
1417 | void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err) |
1418 | { | |
1419 | struct iscsi_session *session = conn->session; | |
7996a778 | 1420 | |
659743b0 | 1421 | spin_lock_bh(&session->frwd_lock); |
656cffc9 | 1422 | if (session->state == ISCSI_STATE_FAILED) { |
659743b0 | 1423 | spin_unlock_bh(&session->frwd_lock); |
656cffc9 MC |
1424 | return; |
1425 | } | |
1426 | ||
67a61114 | 1427 | if (conn->stop_stage == 0) |
7996a778 | 1428 | session->state = ISCSI_STATE_FAILED; |
659743b0 | 1429 | spin_unlock_bh(&session->frwd_lock); |
e5bd7b54 | 1430 | |
7996a778 MC |
1431 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); |
1432 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
e5bd7b54 | 1433 | iscsi_conn_error_event(conn->cls_conn, err); |
7996a778 MC |
1434 | } |
1435 | EXPORT_SYMBOL_GPL(iscsi_conn_failure); | |
1436 | ||
77a23c21 MC |
1437 | static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn) |
1438 | { | |
1439 | struct iscsi_session *session = conn->session; | |
1440 | ||
1441 | /* | |
1442 | * Check for iSCSI window and take care of CmdSN wrap-around | |
1443 | */ | |
e0726407 | 1444 | if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) { |
1b2c7af8 MC |
1445 | ISCSI_DBG_SESSION(session, "iSCSI CmdSN closed. ExpCmdSn " |
1446 | "%u MaxCmdSN %u CmdSN %u/%u\n", | |
1447 | session->exp_cmdsn, session->max_cmdsn, | |
1448 | session->cmdsn, session->queued_cmdsn); | |
77a23c21 MC |
1449 | return -ENOSPC; |
1450 | } | |
1451 | return 0; | |
1452 | } | |
1453 | ||
9c19a7d0 | 1454 | static int iscsi_xmit_task(struct iscsi_conn *conn) |
77a23c21 | 1455 | { |
9c19a7d0 | 1456 | struct iscsi_task *task = conn->task; |
843c0a8a | 1457 | int rc; |
77a23c21 | 1458 | |
70b31c15 MC |
1459 | if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) |
1460 | return -ENODATA; | |
1461 | ||
9c19a7d0 | 1462 | __iscsi_get_task(task); |
659743b0 | 1463 | spin_unlock_bh(&conn->session->frwd_lock); |
9c19a7d0 | 1464 | rc = conn->session->tt->xmit_task(task); |
659743b0 | 1465 | spin_lock_bh(&conn->session->frwd_lock); |
d355e57d | 1466 | if (!rc) { |
9c19a7d0 | 1467 | /* done with this task */ |
d355e57d | 1468 | task->last_xfer = jiffies; |
9c19a7d0 | 1469 | conn->task = NULL; |
d355e57d | 1470 | } |
659743b0 | 1471 | /* regular RX path uses back_lock */ |
72b97402 | 1472 | spin_lock(&conn->session->back_lock); |
d355e57d | 1473 | __iscsi_put_task(task); |
72b97402 | 1474 | spin_unlock(&conn->session->back_lock); |
77a23c21 MC |
1475 | return rc; |
1476 | } | |
1477 | ||
843c0a8a | 1478 | /** |
9c19a7d0 MC |
1479 | * iscsi_requeue_task - requeue task to run from session workqueue |
1480 | * @task: task to requeue | |
843c0a8a | 1481 | * |
9c19a7d0 | 1482 | * LLDs that need to run a task from the session workqueue should call |
659743b0 | 1483 | * this. The session frwd_lock must be held. This should only be called |
052d0144 | 1484 | * by software drivers. |
843c0a8a | 1485 | */ |
9c19a7d0 | 1486 | void iscsi_requeue_task(struct iscsi_task *task) |
843c0a8a | 1487 | { |
9c19a7d0 | 1488 | struct iscsi_conn *conn = task->conn; |
843c0a8a | 1489 | |
3bbaaad9 MC |
1490 | /* |
1491 | * this may be on the requeue list already if the xmit_task callout | |
1492 | * is handling the r2ts while we are adding new ones | |
1493 | */ | |
6f8830f5 | 1494 | spin_lock_bh(&conn->taskqueuelock); |
3bbaaad9 MC |
1495 | if (list_empty(&task->running)) |
1496 | list_add_tail(&task->running, &conn->requeue); | |
6f8830f5 | 1497 | spin_unlock_bh(&conn->taskqueuelock); |
32ae763e | 1498 | iscsi_conn_queue_work(conn); |
843c0a8a | 1499 | } |
9c19a7d0 | 1500 | EXPORT_SYMBOL_GPL(iscsi_requeue_task); |
843c0a8a | 1501 | |
7996a778 MC |
1502 | /** |
1503 | * iscsi_data_xmit - xmit any command into the scheduled connection | |
1504 | * @conn: iscsi connection | |
1505 | * | |
1506 | * Notes: | |
1507 | * The function can return -EAGAIN in which case the caller must | |
1508 | * re-schedule it again later or recover. '0' return code means | |
1509 | * successful xmit. | |
1510 | **/ | |
1511 | static int iscsi_data_xmit(struct iscsi_conn *conn) | |
1512 | { | |
5d12c05e | 1513 | struct iscsi_task *task; |
3219e529 | 1514 | int rc = 0; |
7996a778 | 1515 | |
659743b0 | 1516 | spin_lock_bh(&conn->session->frwd_lock); |
70b31c15 | 1517 | if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) { |
1b2c7af8 | 1518 | ISCSI_DBG_SESSION(conn->session, "Tx suspended!\n"); |
659743b0 | 1519 | spin_unlock_bh(&conn->session->frwd_lock); |
3219e529 | 1520 | return -ENODATA; |
7996a778 | 1521 | } |
7996a778 | 1522 | |
9c19a7d0 MC |
1523 | if (conn->task) { |
1524 | rc = iscsi_xmit_task(conn); | |
3219e529 | 1525 | if (rc) |
70b31c15 | 1526 | goto done; |
7996a778 MC |
1527 | } |
1528 | ||
77a23c21 MC |
1529 | /* |
1530 | * process mgmt pdus like nops before commands since we should | |
1531 | * only have one nop-out as a ping from us and targets should not | |
1532 | * overflow us with nop-ins | |
1533 | */ | |
6f8830f5 | 1534 | spin_lock_bh(&conn->taskqueuelock); |
77a23c21 | 1535 | check_mgmt: |
843c0a8a | 1536 | while (!list_empty(&conn->mgmtqueue)) { |
9c19a7d0 MC |
1537 | conn->task = list_entry(conn->mgmtqueue.next, |
1538 | struct iscsi_task, running); | |
3bbaaad9 | 1539 | list_del_init(&conn->task->running); |
6f8830f5 | 1540 | spin_unlock_bh(&conn->taskqueuelock); |
9c19a7d0 | 1541 | if (iscsi_prep_mgmt_task(conn, conn->task)) { |
659743b0 SP |
1542 | /* regular RX path uses back_lock */ |
1543 | spin_lock_bh(&conn->session->back_lock); | |
9c19a7d0 | 1544 | __iscsi_put_task(conn->task); |
659743b0 | 1545 | spin_unlock_bh(&conn->session->back_lock); |
9c19a7d0 | 1546 | conn->task = NULL; |
6f8830f5 | 1547 | spin_lock_bh(&conn->taskqueuelock); |
b3a7ea8d MC |
1548 | continue; |
1549 | } | |
9c19a7d0 | 1550 | rc = iscsi_xmit_task(conn); |
77a23c21 | 1551 | if (rc) |
70b31c15 | 1552 | goto done; |
6f8830f5 | 1553 | spin_lock_bh(&conn->taskqueuelock); |
7996a778 MC |
1554 | } |
1555 | ||
843c0a8a | 1556 | /* process pending command queue */ |
3bbaaad9 | 1557 | while (!list_empty(&conn->cmdqueue)) { |
5d12c05e MC |
1558 | conn->task = list_entry(conn->cmdqueue.next, struct iscsi_task, |
1559 | running); | |
3bbaaad9 | 1560 | list_del_init(&conn->task->running); |
6f8830f5 | 1561 | spin_unlock_bh(&conn->taskqueuelock); |
b3a7ea8d | 1562 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) { |
b3cd5050 | 1563 | fail_scsi_task(conn->task, DID_IMM_RETRY); |
6f8830f5 | 1564 | spin_lock_bh(&conn->taskqueuelock); |
b3a7ea8d MC |
1565 | continue; |
1566 | } | |
577577da MC |
1567 | rc = iscsi_prep_scsi_cmd_pdu(conn->task); |
1568 | if (rc) { | |
5d12c05e | 1569 | if (rc == -ENOMEM || rc == -EACCES) { |
6f8830f5 | 1570 | spin_lock_bh(&conn->taskqueuelock); |
3bbaaad9 MC |
1571 | list_add_tail(&conn->task->running, |
1572 | &conn->cmdqueue); | |
577577da | 1573 | conn->task = NULL; |
6f8830f5 | 1574 | spin_unlock_bh(&conn->taskqueuelock); |
70b31c15 | 1575 | goto done; |
577577da | 1576 | } else |
b3cd5050 | 1577 | fail_scsi_task(conn->task, DID_ABORT); |
6f8830f5 | 1578 | spin_lock_bh(&conn->taskqueuelock); |
004d6530 BH |
1579 | continue; |
1580 | } | |
9c19a7d0 | 1581 | rc = iscsi_xmit_task(conn); |
77a23c21 | 1582 | if (rc) |
70b31c15 | 1583 | goto done; |
77a23c21 | 1584 | /* |
9c19a7d0 | 1585 | * we could continuously get new task requests so |
77a23c21 MC |
1586 | * we need to check the mgmt queue for nops that need to |
1587 | * be sent to aviod starvation | |
1588 | */ | |
6f8830f5 | 1589 | spin_lock_bh(&conn->taskqueuelock); |
843c0a8a MC |
1590 | if (!list_empty(&conn->mgmtqueue)) |
1591 | goto check_mgmt; | |
1592 | } | |
1593 | ||
1594 | while (!list_empty(&conn->requeue)) { | |
b3a7ea8d MC |
1595 | /* |
1596 | * we always do fastlogout - conn stop code will clean up. | |
1597 | */ | |
1598 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) | |
1599 | break; | |
1600 | ||
5d12c05e MC |
1601 | task = list_entry(conn->requeue.next, struct iscsi_task, |
1602 | running); | |
1603 | if (iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_DATA_OUT)) | |
1604 | break; | |
1605 | ||
1606 | conn->task = task; | |
3bbaaad9 | 1607 | list_del_init(&conn->task->running); |
9c19a7d0 | 1608 | conn->task->state = ISCSI_TASK_RUNNING; |
6f8830f5 | 1609 | spin_unlock_bh(&conn->taskqueuelock); |
9c19a7d0 | 1610 | rc = iscsi_xmit_task(conn); |
843c0a8a | 1611 | if (rc) |
70b31c15 | 1612 | goto done; |
6f8830f5 | 1613 | spin_lock_bh(&conn->taskqueuelock); |
843c0a8a | 1614 | if (!list_empty(&conn->mgmtqueue)) |
77a23c21 | 1615 | goto check_mgmt; |
7996a778 | 1616 | } |
6f8830f5 | 1617 | spin_unlock_bh(&conn->taskqueuelock); |
659743b0 | 1618 | spin_unlock_bh(&conn->session->frwd_lock); |
3219e529 | 1619 | return -ENODATA; |
7996a778 | 1620 | |
70b31c15 | 1621 | done: |
659743b0 | 1622 | spin_unlock_bh(&conn->session->frwd_lock); |
3219e529 | 1623 | return rc; |
7996a778 MC |
1624 | } |
1625 | ||
c4028958 | 1626 | static void iscsi_xmitworker(struct work_struct *work) |
7996a778 | 1627 | { |
c4028958 DH |
1628 | struct iscsi_conn *conn = |
1629 | container_of(work, struct iscsi_conn, xmitwork); | |
3219e529 | 1630 | int rc; |
7996a778 MC |
1631 | /* |
1632 | * serialize Xmit worker on a per-connection basis. | |
1633 | */ | |
3219e529 MC |
1634 | do { |
1635 | rc = iscsi_data_xmit(conn); | |
1636 | } while (rc >= 0 || rc == -EAGAIN); | |
7996a778 MC |
1637 | } |
1638 | ||
577577da MC |
1639 | static inline struct iscsi_task *iscsi_alloc_task(struct iscsi_conn *conn, |
1640 | struct scsi_cmnd *sc) | |
1641 | { | |
1642 | struct iscsi_task *task; | |
1643 | ||
7acd72eb | 1644 | if (!kfifo_out(&conn->session->cmdpool.queue, |
577577da MC |
1645 | (void *) &task, sizeof(void *))) |
1646 | return NULL; | |
1647 | ||
1648 | sc->SCp.phase = conn->session->age; | |
1649 | sc->SCp.ptr = (char *) task; | |
1650 | ||
6dc618cd | 1651 | refcount_set(&task->refcount, 1); |
577577da MC |
1652 | task->state = ISCSI_TASK_PENDING; |
1653 | task->conn = conn; | |
1654 | task->sc = sc; | |
d355e57d MC |
1655 | task->have_checked_conn = false; |
1656 | task->last_timeout = jiffies; | |
1657 | task->last_xfer = jiffies; | |
55e51eda | 1658 | task->protected = false; |
577577da MC |
1659 | INIT_LIST_HEAD(&task->running); |
1660 | return task; | |
1661 | } | |
1662 | ||
7996a778 MC |
1663 | enum { |
1664 | FAILURE_BAD_HOST = 1, | |
1665 | FAILURE_SESSION_FAILED, | |
1666 | FAILURE_SESSION_FREED, | |
1667 | FAILURE_WINDOW_CLOSED, | |
60ecebf5 | 1668 | FAILURE_OOM, |
7996a778 | 1669 | FAILURE_SESSION_TERMINATE, |
656cffc9 | 1670 | FAILURE_SESSION_IN_RECOVERY, |
7996a778 | 1671 | FAILURE_SESSION_RECOVERY_TIMEOUT, |
b3a7ea8d | 1672 | FAILURE_SESSION_LOGGING_OUT, |
6eabafbe | 1673 | FAILURE_SESSION_NOT_READY, |
7996a778 MC |
1674 | }; |
1675 | ||
f41d4721 | 1676 | int iscsi_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc) |
7996a778 | 1677 | { |
75613521 | 1678 | struct iscsi_cls_session *cls_session; |
1336aed1 | 1679 | struct iscsi_host *ihost; |
7996a778 MC |
1680 | int reason = 0; |
1681 | struct iscsi_session *session; | |
1682 | struct iscsi_conn *conn; | |
9c19a7d0 | 1683 | struct iscsi_task *task = NULL; |
7996a778 | 1684 | |
7996a778 | 1685 | sc->result = 0; |
f47f2cf5 | 1686 | sc->SCp.ptr = NULL; |
7996a778 | 1687 | |
1336aed1 | 1688 | ihost = shost_priv(host); |
7996a778 | 1689 | |
75613521 MC |
1690 | cls_session = starget_to_session(scsi_target(sc->device)); |
1691 | session = cls_session->dd_data; | |
659743b0 | 1692 | spin_lock_bh(&session->frwd_lock); |
7996a778 | 1693 | |
75613521 | 1694 | reason = iscsi_session_chkready(cls_session); |
6eabafbe MC |
1695 | if (reason) { |
1696 | sc->result = reason; | |
1697 | goto fault; | |
1698 | } | |
1699 | ||
301e0f7e | 1700 | if (session->state != ISCSI_STATE_LOGGED_IN) { |
656cffc9 MC |
1701 | /* |
1702 | * to handle the race between when we set the recovery state | |
1703 | * and block the session we requeue here (commands could | |
1704 | * be entering our queuecommand while a block is starting | |
1705 | * up because the block code is not locked) | |
1706 | */ | |
9000bcd6 | 1707 | switch (session->state) { |
301e0f7e | 1708 | case ISCSI_STATE_FAILED: |
d7549412 RDT |
1709 | /* |
1710 | * cmds should fail during shutdown, if the session | |
1711 | * state is bad, allowing completion to happen | |
1712 | */ | |
1713 | if (unlikely(system_state != SYSTEM_RUNNING)) { | |
1714 | reason = FAILURE_SESSION_FAILED; | |
1715 | sc->result = DID_NO_CONNECT << 16; | |
1716 | break; | |
1717 | } | |
807cf197 | 1718 | /* fall through */ |
9000bcd6 | 1719 | case ISCSI_STATE_IN_RECOVERY: |
656cffc9 | 1720 | reason = FAILURE_SESSION_IN_RECOVERY; |
301e0f7e MC |
1721 | sc->result = DID_IMM_RETRY << 16; |
1722 | break; | |
9000bcd6 MC |
1723 | case ISCSI_STATE_LOGGING_OUT: |
1724 | reason = FAILURE_SESSION_LOGGING_OUT; | |
301e0f7e MC |
1725 | sc->result = DID_IMM_RETRY << 16; |
1726 | break; | |
b3a7ea8d | 1727 | case ISCSI_STATE_RECOVERY_FAILED: |
656cffc9 | 1728 | reason = FAILURE_SESSION_RECOVERY_TIMEOUT; |
56d7fcfa | 1729 | sc->result = DID_TRANSPORT_FAILFAST << 16; |
b3a7ea8d MC |
1730 | break; |
1731 | case ISCSI_STATE_TERMINATE: | |
656cffc9 | 1732 | reason = FAILURE_SESSION_TERMINATE; |
6eabafbe | 1733 | sc->result = DID_NO_CONNECT << 16; |
b3a7ea8d | 1734 | break; |
b3a7ea8d | 1735 | default: |
656cffc9 | 1736 | reason = FAILURE_SESSION_FREED; |
6eabafbe | 1737 | sc->result = DID_NO_CONNECT << 16; |
b3a7ea8d | 1738 | } |
7996a778 MC |
1739 | goto fault; |
1740 | } | |
1741 | ||
7996a778 | 1742 | conn = session->leadconn; |
98644047 MC |
1743 | if (!conn) { |
1744 | reason = FAILURE_SESSION_FREED; | |
6eabafbe | 1745 | sc->result = DID_NO_CONNECT << 16; |
98644047 MC |
1746 | goto fault; |
1747 | } | |
7996a778 | 1748 | |
661134ad MC |
1749 | if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) { |
1750 | reason = FAILURE_SESSION_IN_RECOVERY; | |
eef9ffdf | 1751 | sc->result = DID_REQUEUE << 16; |
661134ad MC |
1752 | goto fault; |
1753 | } | |
1754 | ||
77a23c21 MC |
1755 | if (iscsi_check_cmdsn_window_closed(conn)) { |
1756 | reason = FAILURE_WINDOW_CLOSED; | |
1757 | goto reject; | |
1758 | } | |
1759 | ||
577577da MC |
1760 | task = iscsi_alloc_task(conn, sc); |
1761 | if (!task) { | |
60ecebf5 MC |
1762 | reason = FAILURE_OOM; |
1763 | goto reject; | |
1764 | } | |
7996a778 | 1765 | |
1336aed1 | 1766 | if (!ihost->workq) { |
577577da MC |
1767 | reason = iscsi_prep_scsi_cmd_pdu(task); |
1768 | if (reason) { | |
5d12c05e | 1769 | if (reason == -ENOMEM || reason == -EACCES) { |
577577da MC |
1770 | reason = FAILURE_OOM; |
1771 | goto prepd_reject; | |
1772 | } else { | |
1773 | sc->result = DID_ABORT << 16; | |
1774 | goto prepd_fault; | |
1775 | } | |
052d0144 | 1776 | } |
9c19a7d0 | 1777 | if (session->tt->xmit_task(task)) { |
d3305f34 | 1778 | session->cmdsn--; |
052d0144 | 1779 | reason = FAILURE_SESSION_NOT_READY; |
577577da | 1780 | goto prepd_reject; |
052d0144 | 1781 | } |
3bbaaad9 | 1782 | } else { |
6f8830f5 | 1783 | spin_lock_bh(&conn->taskqueuelock); |
3bbaaad9 | 1784 | list_add_tail(&task->running, &conn->cmdqueue); |
6f8830f5 | 1785 | spin_unlock_bh(&conn->taskqueuelock); |
32ae763e | 1786 | iscsi_conn_queue_work(conn); |
3bbaaad9 | 1787 | } |
052d0144 MC |
1788 | |
1789 | session->queued_cmdsn++; | |
659743b0 | 1790 | spin_unlock_bh(&session->frwd_lock); |
7996a778 MC |
1791 | return 0; |
1792 | ||
577577da | 1793 | prepd_reject: |
f41d4721 | 1794 | iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ); |
7996a778 | 1795 | reject: |
659743b0 | 1796 | spin_unlock_bh(&session->frwd_lock); |
1b2c7af8 MC |
1797 | ISCSI_DBG_SESSION(session, "cmd 0x%x rejected (%d)\n", |
1798 | sc->cmnd[0], reason); | |
d6d13ee1 | 1799 | return SCSI_MLQUEUE_TARGET_BUSY; |
7996a778 | 1800 | |
577577da | 1801 | prepd_fault: |
f41d4721 | 1802 | iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ); |
7996a778 | 1803 | fault: |
659743b0 | 1804 | spin_unlock_bh(&session->frwd_lock); |
1b2c7af8 MC |
1805 | ISCSI_DBG_SESSION(session, "iscsi: cmd 0x%x is not queued (%d)\n", |
1806 | sc->cmnd[0], reason); | |
c07d4444 BH |
1807 | if (!scsi_bidi_cmnd(sc)) |
1808 | scsi_set_resid(sc, scsi_bufflen(sc)); | |
1809 | else { | |
1810 | scsi_out(sc)->resid = scsi_out(sc)->length; | |
1811 | scsi_in(sc)->resid = scsi_in(sc)->length; | |
1812 | } | |
f41d4721 | 1813 | sc->scsi_done(sc); |
7996a778 MC |
1814 | return 0; |
1815 | } | |
1816 | EXPORT_SYMBOL_GPL(iscsi_queuecommand); | |
1817 | ||
6b5d6c44 MC |
1818 | int iscsi_target_alloc(struct scsi_target *starget) |
1819 | { | |
1820 | struct iscsi_cls_session *cls_session = starget_to_session(starget); | |
1821 | struct iscsi_session *session = cls_session->dd_data; | |
1822 | ||
1823 | starget->can_queue = session->scsi_cmds_max; | |
1824 | return 0; | |
1825 | } | |
1826 | EXPORT_SYMBOL_GPL(iscsi_target_alloc); | |
1827 | ||
2c4b9637 | 1828 | static void iscsi_tmf_timedout(struct timer_list *t) |
7996a778 | 1829 | { |
2c4b9637 | 1830 | struct iscsi_conn *conn = from_timer(conn, t, tmf_timer); |
7996a778 MC |
1831 | struct iscsi_session *session = conn->session; |
1832 | ||
659743b0 | 1833 | spin_lock(&session->frwd_lock); |
843c0a8a MC |
1834 | if (conn->tmf_state == TMF_QUEUED) { |
1835 | conn->tmf_state = TMF_TIMEDOUT; | |
bd2199d4 | 1836 | ISCSI_DBG_EH(session, "tmf timedout\n"); |
7996a778 MC |
1837 | /* unblock eh_abort() */ |
1838 | wake_up(&conn->ehwait); | |
1839 | } | |
659743b0 | 1840 | spin_unlock(&session->frwd_lock); |
7996a778 MC |
1841 | } |
1842 | ||
9c19a7d0 | 1843 | static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn, |
f6d5180c MC |
1844 | struct iscsi_tm *hdr, int age, |
1845 | int timeout) | |
1360c58a | 1846 | __must_hold(&session->frwd_lock) |
7996a778 | 1847 | { |
7996a778 | 1848 | struct iscsi_session *session = conn->session; |
9c19a7d0 | 1849 | struct iscsi_task *task; |
7996a778 | 1850 | |
9c19a7d0 | 1851 | task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr, |
843c0a8a | 1852 | NULL, 0); |
9c19a7d0 | 1853 | if (!task) { |
659743b0 | 1854 | spin_unlock_bh(&session->frwd_lock); |
df4da5cd | 1855 | iscsi_conn_printk(KERN_ERR, conn, "Could not send TMF.\n"); |
7996a778 | 1856 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
659743b0 | 1857 | spin_lock_bh(&session->frwd_lock); |
77a23c21 | 1858 | return -EPERM; |
7996a778 | 1859 | } |
843c0a8a | 1860 | conn->tmfcmd_pdus_cnt++; |
f6d5180c | 1861 | conn->tmf_timer.expires = timeout * HZ + jiffies; |
843c0a8a | 1862 | add_timer(&conn->tmf_timer); |
bd2199d4 | 1863 | ISCSI_DBG_EH(session, "tmf set timeout\n"); |
7996a778 | 1864 | |
659743b0 | 1865 | spin_unlock_bh(&session->frwd_lock); |
6724add1 | 1866 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1867 | |
1868 | /* | |
1869 | * block eh thread until: | |
1870 | * | |
843c0a8a MC |
1871 | * 1) tmf response |
1872 | * 2) tmf timeout | |
7996a778 MC |
1873 | * 3) session is terminated or restarted or userspace has |
1874 | * given up on recovery | |
1875 | */ | |
843c0a8a | 1876 | wait_event_interruptible(conn->ehwait, age != session->age || |
7996a778 | 1877 | session->state != ISCSI_STATE_LOGGED_IN || |
843c0a8a | 1878 | conn->tmf_state != TMF_QUEUED); |
7996a778 MC |
1879 | if (signal_pending(current)) |
1880 | flush_signals(current); | |
843c0a8a MC |
1881 | del_timer_sync(&conn->tmf_timer); |
1882 | ||
6724add1 | 1883 | mutex_lock(&session->eh_mutex); |
659743b0 | 1884 | spin_lock_bh(&session->frwd_lock); |
9c19a7d0 | 1885 | /* if the session drops it will clean up the task */ |
843c0a8a MC |
1886 | if (age != session->age || |
1887 | session->state != ISCSI_STATE_LOGGED_IN) | |
1888 | return -ENOTCONN; | |
7996a778 MC |
1889 | return 0; |
1890 | } | |
1891 | ||
843c0a8a MC |
1892 | /* |
1893 | * Fail commands. session lock held and recv side suspended and xmit | |
1894 | * thread flushed | |
1895 | */ | |
9cb78c16 | 1896 | static void fail_scsi_tasks(struct iscsi_conn *conn, u64 lun, int error) |
843c0a8a | 1897 | { |
3bbaaad9 MC |
1898 | struct iscsi_task *task; |
1899 | int i; | |
843c0a8a | 1900 | |
3bbaaad9 MC |
1901 | for (i = 0; i < conn->session->cmds_max; i++) { |
1902 | task = conn->session->cmds[i]; | |
1903 | if (!task->sc || task->state == ISCSI_TASK_FREE) | |
1904 | continue; | |
843c0a8a | 1905 | |
3bbaaad9 MC |
1906 | if (lun != -1 && lun != task->sc->device->lun) |
1907 | continue; | |
843c0a8a | 1908 | |
3bbaaad9 MC |
1909 | ISCSI_DBG_SESSION(conn->session, |
1910 | "failing sc %p itt 0x%x state %d\n", | |
1911 | task->sc, task->itt, task->state); | |
b3cd5050 | 1912 | fail_scsi_task(task, error); |
843c0a8a MC |
1913 | } |
1914 | } | |
1915 | ||
661134ad MC |
1916 | /** |
1917 | * iscsi_suspend_queue - suspend iscsi_queuecommand | |
1918 | * @conn: iscsi conn to stop queueing IO on | |
1919 | * | |
659743b0 | 1920 | * This grabs the session frwd_lock to make sure no one is in |
661134ad MC |
1921 | * xmit_task/queuecommand, and then sets suspend to prevent |
1922 | * new commands from being queued. This only needs to be called | |
1923 | * by offload drivers that need to sync a path like ep disconnect | |
1924 | * with the iscsi_queuecommand/xmit_task. To start IO again libiscsi | |
1925 | * will call iscsi_start_tx and iscsi_unblock_session when in FFP. | |
1926 | */ | |
1927 | void iscsi_suspend_queue(struct iscsi_conn *conn) | |
1928 | { | |
659743b0 | 1929 | spin_lock_bh(&conn->session->frwd_lock); |
661134ad | 1930 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); |
659743b0 | 1931 | spin_unlock_bh(&conn->session->frwd_lock); |
661134ad MC |
1932 | } |
1933 | EXPORT_SYMBOL_GPL(iscsi_suspend_queue); | |
1934 | ||
1935 | /** | |
1936 | * iscsi_suspend_tx - suspend iscsi_data_xmit | |
1937 | * @conn: iscsi conn tp stop processing IO on. | |
1938 | * | |
1939 | * This function sets the suspend bit to prevent iscsi_data_xmit | |
1940 | * from sending new IO, and if work is queued on the xmit thread | |
1941 | * it will wait for it to be completed. | |
1942 | */ | |
b40977d9 | 1943 | void iscsi_suspend_tx(struct iscsi_conn *conn) |
6724add1 | 1944 | { |
32ae763e MC |
1945 | struct Scsi_Host *shost = conn->session->host; |
1946 | struct iscsi_host *ihost = shost_priv(shost); | |
1947 | ||
6724add1 | 1948 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); |
1336aed1 | 1949 | if (ihost->workq) |
32ae763e | 1950 | flush_workqueue(ihost->workq); |
6724add1 | 1951 | } |
b40977d9 | 1952 | EXPORT_SYMBOL_GPL(iscsi_suspend_tx); |
6724add1 MC |
1953 | |
1954 | static void iscsi_start_tx(struct iscsi_conn *conn) | |
1955 | { | |
1956 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
1336aed1 | 1957 | iscsi_conn_queue_work(conn); |
6724add1 MC |
1958 | } |
1959 | ||
4c48a829 MC |
1960 | /* |
1961 | * We want to make sure a ping is in flight. It has timed out. | |
1962 | * And we are not busy processing a pdu that is making | |
1963 | * progress but got started before the ping and is taking a while | |
1964 | * to complete so the ping is just stuck behind it in a queue. | |
1965 | */ | |
1966 | static int iscsi_has_ping_timed_out(struct iscsi_conn *conn) | |
1967 | { | |
1968 | if (conn->ping_task && | |
1969 | time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) + | |
1970 | (conn->ping_timeout * HZ), jiffies)) | |
1971 | return 1; | |
1972 | else | |
1973 | return 0; | |
1974 | } | |
1975 | ||
b6a05c82 | 1976 | enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *sc) |
f6d5180c | 1977 | { |
6600593c | 1978 | enum blk_eh_timer_return rc = BLK_EH_DONE; |
92ed4d69 | 1979 | struct iscsi_task *task = NULL, *running_task; |
f6d5180c MC |
1980 | struct iscsi_cls_session *cls_session; |
1981 | struct iscsi_session *session; | |
1982 | struct iscsi_conn *conn; | |
92ed4d69 | 1983 | int i; |
f6d5180c | 1984 | |
d355e57d | 1985 | cls_session = starget_to_session(scsi_target(sc->device)); |
75613521 | 1986 | session = cls_session->dd_data; |
f6d5180c | 1987 | |
bd2199d4 | 1988 | ISCSI_DBG_EH(session, "scsi cmd %p timedout\n", sc); |
f6d5180c | 1989 | |
659743b0 | 1990 | spin_lock(&session->frwd_lock); |
e3d338a5 MC |
1991 | task = (struct iscsi_task *)sc->SCp.ptr; |
1992 | if (!task) { | |
1993 | /* | |
1994 | * Raced with completion. Blk layer has taken ownership | |
1995 | * so let timeout code complete it now. | |
1996 | */ | |
adb2b769 | 1997 | rc = BLK_EH_DONE; |
e3d338a5 MC |
1998 | goto done; |
1999 | } | |
2000 | ||
f6d5180c | 2001 | if (session->state != ISCSI_STATE_LOGGED_IN) { |
d7549412 RDT |
2002 | /* |
2003 | * During shutdown, if session is prematurely disconnected, | |
2004 | * recovery won't happen and there will be hung cmds. Not | |
2005 | * handling cmds would trigger EH, also bad in this case. | |
2006 | * Instead, handle cmd, allow completion to happen and let | |
2007 | * upper layer to deal with the result. | |
2008 | */ | |
2009 | if (unlikely(system_state != SYSTEM_RUNNING)) { | |
2010 | sc->result = DID_NO_CONNECT << 16; | |
2011 | ISCSI_DBG_EH(session, "sc on shutdown, handled\n"); | |
adb2b769 | 2012 | rc = BLK_EH_DONE; |
d7549412 RDT |
2013 | goto done; |
2014 | } | |
f6d5180c MC |
2015 | /* |
2016 | * We are probably in the middle of iscsi recovery so let | |
2017 | * that complete and handle the error. | |
2018 | */ | |
242f9dcb | 2019 | rc = BLK_EH_RESET_TIMER; |
f6d5180c MC |
2020 | goto done; |
2021 | } | |
2022 | ||
2023 | conn = session->leadconn; | |
2024 | if (!conn) { | |
2025 | /* In the middle of shuting down */ | |
242f9dcb | 2026 | rc = BLK_EH_RESET_TIMER; |
f6d5180c MC |
2027 | goto done; |
2028 | } | |
2029 | ||
d355e57d MC |
2030 | /* |
2031 | * If we have sent (at least queued to the network layer) a pdu or | |
2032 | * recvd one for the task since the last timeout ask for | |
2033 | * more time. If on the next timeout we have not made progress | |
2034 | * we can check if it is the task or connection when we send the | |
2035 | * nop as a ping. | |
2036 | */ | |
92ed4d69 | 2037 | if (time_after(task->last_xfer, task->last_timeout)) { |
bd2199d4 EZ |
2038 | ISCSI_DBG_EH(session, "Command making progress. Asking " |
2039 | "scsi-ml for more time to complete. " | |
92ed4d69 | 2040 | "Last data xfer at %lu. Last timeout was at " |
bd2199d4 | 2041 | "%lu\n.", task->last_xfer, task->last_timeout); |
d355e57d MC |
2042 | task->have_checked_conn = false; |
2043 | rc = BLK_EH_RESET_TIMER; | |
2044 | goto done; | |
2045 | } | |
2046 | ||
f6d5180c MC |
2047 | if (!conn->recv_timeout && !conn->ping_timeout) |
2048 | goto done; | |
2049 | /* | |
2050 | * if the ping timedout then we are in the middle of cleaning up | |
2051 | * and can let the iscsi eh handle it | |
2052 | */ | |
4c48a829 | 2053 | if (iscsi_has_ping_timed_out(conn)) { |
242f9dcb | 2054 | rc = BLK_EH_RESET_TIMER; |
4c48a829 MC |
2055 | goto done; |
2056 | } | |
d355e57d | 2057 | |
92ed4d69 MC |
2058 | for (i = 0; i < conn->session->cmds_max; i++) { |
2059 | running_task = conn->session->cmds[i]; | |
2060 | if (!running_task->sc || running_task == task || | |
2061 | running_task->state != ISCSI_TASK_RUNNING) | |
2062 | continue; | |
2063 | ||
2064 | /* | |
2065 | * Only check if cmds started before this one have made | |
2066 | * progress, or this could never fail | |
2067 | */ | |
2068 | if (time_after(running_task->sc->jiffies_at_alloc, | |
2069 | task->sc->jiffies_at_alloc)) | |
2070 | continue; | |
2071 | ||
2072 | if (time_after(running_task->last_xfer, task->last_timeout)) { | |
2073 | /* | |
2074 | * This task has not made progress, but a task | |
2075 | * started before us has transferred data since | |
2076 | * we started/last-checked. We could be queueing | |
2077 | * too many tasks or the LU is bad. | |
2078 | * | |
2079 | * If the device is bad the cmds ahead of us on | |
2080 | * other devs will complete, and this loop will | |
2081 | * eventually fail starting the scsi eh. | |
2082 | */ | |
2083 | ISCSI_DBG_EH(session, "Command has not made progress " | |
2084 | "but commands ahead of it have. " | |
2085 | "Asking scsi-ml for more time to " | |
2086 | "complete. Our last xfer vs running task " | |
2087 | "last xfer %lu/%lu. Last check %lu.\n", | |
2088 | task->last_xfer, running_task->last_xfer, | |
2089 | task->last_timeout); | |
2090 | rc = BLK_EH_RESET_TIMER; | |
2091 | goto done; | |
2092 | } | |
2093 | } | |
2094 | ||
d355e57d MC |
2095 | /* Assumes nop timeout is shorter than scsi cmd timeout */ |
2096 | if (task->have_checked_conn) | |
2097 | goto done; | |
2098 | ||
f6d5180c | 2099 | /* |
d355e57d MC |
2100 | * Checking the transport already or nop from a cmd timeout still |
2101 | * running | |
f6d5180c | 2102 | */ |
d355e57d MC |
2103 | if (conn->ping_task) { |
2104 | task->have_checked_conn = true; | |
242f9dcb | 2105 | rc = BLK_EH_RESET_TIMER; |
4c48a829 MC |
2106 | goto done; |
2107 | } | |
2108 | ||
d355e57d MC |
2109 | /* Make sure there is a transport check done */ |
2110 | iscsi_send_nopout(conn, NULL); | |
2111 | task->have_checked_conn = true; | |
2112 | rc = BLK_EH_RESET_TIMER; | |
2113 | ||
f6d5180c | 2114 | done: |
d355e57d MC |
2115 | if (task) |
2116 | task->last_timeout = jiffies; | |
659743b0 | 2117 | spin_unlock(&session->frwd_lock); |
bd2199d4 | 2118 | ISCSI_DBG_EH(session, "return %s\n", rc == BLK_EH_RESET_TIMER ? |
d7549412 | 2119 | "timer reset" : "shutdown or nh"); |
f6d5180c MC |
2120 | return rc; |
2121 | } | |
b6a05c82 | 2122 | EXPORT_SYMBOL_GPL(iscsi_eh_cmd_timed_out); |
f6d5180c | 2123 | |
2c4b9637 | 2124 | static void iscsi_check_transport_timeouts(struct timer_list *t) |
f6d5180c | 2125 | { |
2c4b9637 | 2126 | struct iscsi_conn *conn = from_timer(conn, t, transport_timer); |
f6d5180c | 2127 | struct iscsi_session *session = conn->session; |
4cf10435 | 2128 | unsigned long recv_timeout, next_timeout = 0, last_recv; |
f6d5180c | 2129 | |
659743b0 | 2130 | spin_lock(&session->frwd_lock); |
f6d5180c MC |
2131 | if (session->state != ISCSI_STATE_LOGGED_IN) |
2132 | goto done; | |
2133 | ||
4cf10435 MC |
2134 | recv_timeout = conn->recv_timeout; |
2135 | if (!recv_timeout) | |
f6d5180c MC |
2136 | goto done; |
2137 | ||
4cf10435 | 2138 | recv_timeout *= HZ; |
f6d5180c | 2139 | last_recv = conn->last_recv; |
4c48a829 MC |
2140 | |
2141 | if (iscsi_has_ping_timed_out(conn)) { | |
322d739d | 2142 | iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs " |
4c48a829 MC |
2143 | "expired, recv timeout %d, last rx %lu, " |
2144 | "last ping %lu, now %lu\n", | |
2145 | conn->ping_timeout, conn->recv_timeout, | |
2146 | last_recv, conn->last_ping, jiffies); | |
659743b0 | 2147 | spin_unlock(&session->frwd_lock); |
09ff742c | 2148 | iscsi_conn_failure(conn, ISCSI_ERR_NOP_TIMEDOUT); |
f6d5180c MC |
2149 | return; |
2150 | } | |
2151 | ||
4cf10435 | 2152 | if (time_before_eq(last_recv + recv_timeout, jiffies)) { |
c8611f97 | 2153 | /* send a ping to try to provoke some traffic */ |
1b2c7af8 | 2154 | ISCSI_DBG_CONN(conn, "Sending nopout as ping\n"); |
52f5664a AN |
2155 | if (iscsi_send_nopout(conn, NULL)) |
2156 | next_timeout = jiffies + (1 * HZ); | |
2157 | else | |
2158 | next_timeout = conn->last_ping + (conn->ping_timeout * HZ); | |
ad294e9c | 2159 | } else |
4cf10435 | 2160 | next_timeout = last_recv + recv_timeout; |
f6d5180c | 2161 | |
1b2c7af8 | 2162 | ISCSI_DBG_CONN(conn, "Setting next tmo %lu\n", next_timeout); |
ad294e9c | 2163 | mod_timer(&conn->transport_timer, next_timeout); |
f6d5180c | 2164 | done: |
659743b0 | 2165 | spin_unlock(&session->frwd_lock); |
f6d5180c MC |
2166 | } |
2167 | ||
9c19a7d0 | 2168 | static void iscsi_prep_abort_task_pdu(struct iscsi_task *task, |
843c0a8a MC |
2169 | struct iscsi_tm *hdr) |
2170 | { | |
2171 | memset(hdr, 0, sizeof(*hdr)); | |
2172 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
2173 | hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK; | |
2174 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
55bdabdf | 2175 | hdr->lun = task->lun; |
577577da MC |
2176 | hdr->rtt = task->hdr_itt; |
2177 | hdr->refcmdsn = task->cmdsn; | |
843c0a8a MC |
2178 | } |
2179 | ||
7996a778 MC |
2180 | int iscsi_eh_abort(struct scsi_cmnd *sc) |
2181 | { | |
75613521 MC |
2182 | struct iscsi_cls_session *cls_session; |
2183 | struct iscsi_session *session; | |
f47f2cf5 | 2184 | struct iscsi_conn *conn; |
9c19a7d0 | 2185 | struct iscsi_task *task; |
843c0a8a | 2186 | struct iscsi_tm *hdr; |
e9e410e8 | 2187 | int age; |
7996a778 | 2188 | |
75613521 MC |
2189 | cls_session = starget_to_session(scsi_target(sc->device)); |
2190 | session = cls_session->dd_data; | |
2191 | ||
bd2199d4 | 2192 | ISCSI_DBG_EH(session, "aborting sc %p\n", sc); |
4421c9eb | 2193 | |
6724add1 | 2194 | mutex_lock(&session->eh_mutex); |
659743b0 | 2195 | spin_lock_bh(&session->frwd_lock); |
f47f2cf5 MC |
2196 | /* |
2197 | * if session was ISCSI_STATE_IN_RECOVERY then we may not have | |
2198 | * got the command. | |
2199 | */ | |
2200 | if (!sc->SCp.ptr) { | |
bd2199d4 EZ |
2201 | ISCSI_DBG_EH(session, "sc never reached iscsi layer or " |
2202 | "it completed.\n"); | |
659743b0 | 2203 | spin_unlock_bh(&session->frwd_lock); |
6724add1 | 2204 | mutex_unlock(&session->eh_mutex); |
f47f2cf5 MC |
2205 | return SUCCESS; |
2206 | } | |
2207 | ||
7996a778 MC |
2208 | /* |
2209 | * If we are not logged in or we have started a new session | |
2210 | * then let the host reset code handle this | |
2211 | */ | |
843c0a8a MC |
2212 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN || |
2213 | sc->SCp.phase != session->age) { | |
659743b0 | 2214 | spin_unlock_bh(&session->frwd_lock); |
843c0a8a | 2215 | mutex_unlock(&session->eh_mutex); |
bd2199d4 | 2216 | ISCSI_DBG_EH(session, "failing abort due to dropped " |
4421c9eb | 2217 | "session.\n"); |
843c0a8a MC |
2218 | return FAILED; |
2219 | } | |
2220 | ||
2221 | conn = session->leadconn; | |
2222 | conn->eh_abort_cnt++; | |
2223 | age = session->age; | |
2224 | ||
9c19a7d0 | 2225 | task = (struct iscsi_task *)sc->SCp.ptr; |
bd2199d4 EZ |
2226 | ISCSI_DBG_EH(session, "aborting [sc %p itt 0x%x]\n", |
2227 | sc, task->itt); | |
7996a778 | 2228 | |
9c19a7d0 MC |
2229 | /* task completed before time out */ |
2230 | if (!task->sc) { | |
bd2199d4 | 2231 | ISCSI_DBG_EH(session, "sc completed while abort in progress\n"); |
77a23c21 | 2232 | goto success; |
7ea8b828 | 2233 | } |
7996a778 | 2234 | |
9c19a7d0 | 2235 | if (task->state == ISCSI_TASK_PENDING) { |
b3cd5050 | 2236 | fail_scsi_task(task, DID_ABORT); |
77a23c21 MC |
2237 | goto success; |
2238 | } | |
7996a778 | 2239 | |
843c0a8a MC |
2240 | /* only have one tmf outstanding at a time */ |
2241 | if (conn->tmf_state != TMF_INITIAL) | |
7996a778 | 2242 | goto failed; |
843c0a8a | 2243 | conn->tmf_state = TMF_QUEUED; |
7996a778 | 2244 | |
843c0a8a | 2245 | hdr = &conn->tmhdr; |
9c19a7d0 | 2246 | iscsi_prep_abort_task_pdu(task, hdr); |
843c0a8a | 2247 | |
e9e410e8 | 2248 | if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout)) |
843c0a8a | 2249 | goto failed; |
843c0a8a MC |
2250 | |
2251 | switch (conn->tmf_state) { | |
2252 | case TMF_SUCCESS: | |
659743b0 | 2253 | spin_unlock_bh(&session->frwd_lock); |
913e5bf4 MC |
2254 | /* |
2255 | * stop tx side incase the target had sent a abort rsp but | |
2256 | * the initiator was still writing out data. | |
2257 | */ | |
6724add1 | 2258 | iscsi_suspend_tx(conn); |
77a23c21 | 2259 | /* |
913e5bf4 MC |
2260 | * we do not stop the recv side because targets have been |
2261 | * good and have never sent us a successful tmf response | |
2262 | * then sent more data for the cmd. | |
77a23c21 | 2263 | */ |
659743b0 | 2264 | spin_lock_bh(&session->frwd_lock); |
b3cd5050 | 2265 | fail_scsi_task(task, DID_ABORT); |
843c0a8a | 2266 | conn->tmf_state = TMF_INITIAL; |
5d12c05e | 2267 | memset(hdr, 0, sizeof(*hdr)); |
659743b0 | 2268 | spin_unlock_bh(&session->frwd_lock); |
6724add1 | 2269 | iscsi_start_tx(conn); |
77a23c21 | 2270 | goto success_unlocked; |
843c0a8a | 2271 | case TMF_TIMEDOUT: |
659743b0 | 2272 | spin_unlock_bh(&session->frwd_lock); |
df4da5cd | 2273 | iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); |
843c0a8a MC |
2274 | goto failed_unlocked; |
2275 | case TMF_NOT_FOUND: | |
2276 | if (!sc->SCp.ptr) { | |
2277 | conn->tmf_state = TMF_INITIAL; | |
5d12c05e | 2278 | memset(hdr, 0, sizeof(*hdr)); |
9c19a7d0 | 2279 | /* task completed before tmf abort response */ |
bd2199d4 EZ |
2280 | ISCSI_DBG_EH(session, "sc completed while abort in " |
2281 | "progress\n"); | |
77a23c21 | 2282 | goto success; |
7ea8b828 MC |
2283 | } |
2284 | /* fall through */ | |
2285 | default: | |
843c0a8a MC |
2286 | conn->tmf_state = TMF_INITIAL; |
2287 | goto failed; | |
7996a778 MC |
2288 | } |
2289 | ||
77a23c21 | 2290 | success: |
659743b0 | 2291 | spin_unlock_bh(&session->frwd_lock); |
77a23c21 | 2292 | success_unlocked: |
bd2199d4 EZ |
2293 | ISCSI_DBG_EH(session, "abort success [sc %p itt 0x%x]\n", |
2294 | sc, task->itt); | |
6724add1 | 2295 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
2296 | return SUCCESS; |
2297 | ||
2298 | failed: | |
659743b0 | 2299 | spin_unlock_bh(&session->frwd_lock); |
77a23c21 | 2300 | failed_unlocked: |
bd2199d4 EZ |
2301 | ISCSI_DBG_EH(session, "abort failed [sc %p itt 0x%x]\n", sc, |
2302 | task ? task->itt : 0); | |
6724add1 | 2303 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
2304 | return FAILED; |
2305 | } | |
2306 | EXPORT_SYMBOL_GPL(iscsi_eh_abort); | |
2307 | ||
843c0a8a MC |
2308 | static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr) |
2309 | { | |
2310 | memset(hdr, 0, sizeof(*hdr)); | |
2311 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
2312 | hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK; | |
2313 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
55bdabdf | 2314 | int_to_scsilun(sc->device->lun, &hdr->lun); |
f6d5180c | 2315 | hdr->rtt = RESERVED_ITT; |
843c0a8a MC |
2316 | } |
2317 | ||
2318 | int iscsi_eh_device_reset(struct scsi_cmnd *sc) | |
2319 | { | |
75613521 MC |
2320 | struct iscsi_cls_session *cls_session; |
2321 | struct iscsi_session *session; | |
843c0a8a MC |
2322 | struct iscsi_conn *conn; |
2323 | struct iscsi_tm *hdr; | |
2324 | int rc = FAILED; | |
2325 | ||
75613521 MC |
2326 | cls_session = starget_to_session(scsi_target(sc->device)); |
2327 | session = cls_session->dd_data; | |
2328 | ||
9cb78c16 HR |
2329 | ISCSI_DBG_EH(session, "LU Reset [sc %p lun %llu]\n", sc, |
2330 | sc->device->lun); | |
843c0a8a MC |
2331 | |
2332 | mutex_lock(&session->eh_mutex); | |
659743b0 | 2333 | spin_lock_bh(&session->frwd_lock); |
843c0a8a MC |
2334 | /* |
2335 | * Just check if we are not logged in. We cannot check for | |
2336 | * the phase because the reset could come from a ioctl. | |
2337 | */ | |
2338 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN) | |
2339 | goto unlock; | |
2340 | conn = session->leadconn; | |
2341 | ||
2342 | /* only have one tmf outstanding at a time */ | |
2343 | if (conn->tmf_state != TMF_INITIAL) | |
2344 | goto unlock; | |
2345 | conn->tmf_state = TMF_QUEUED; | |
2346 | ||
2347 | hdr = &conn->tmhdr; | |
2348 | iscsi_prep_lun_reset_pdu(sc, hdr); | |
2349 | ||
9c19a7d0 | 2350 | if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age, |
f6d5180c | 2351 | session->lu_reset_timeout)) { |
843c0a8a MC |
2352 | rc = FAILED; |
2353 | goto unlock; | |
2354 | } | |
2355 | ||
2356 | switch (conn->tmf_state) { | |
2357 | case TMF_SUCCESS: | |
2358 | break; | |
2359 | case TMF_TIMEDOUT: | |
659743b0 | 2360 | spin_unlock_bh(&session->frwd_lock); |
df4da5cd | 2361 | iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); |
843c0a8a MC |
2362 | goto done; |
2363 | default: | |
2364 | conn->tmf_state = TMF_INITIAL; | |
2365 | goto unlock; | |
2366 | } | |
2367 | ||
2368 | rc = SUCCESS; | |
659743b0 | 2369 | spin_unlock_bh(&session->frwd_lock); |
843c0a8a MC |
2370 | |
2371 | iscsi_suspend_tx(conn); | |
913e5bf4 | 2372 | |
659743b0 | 2373 | spin_lock_bh(&session->frwd_lock); |
5d12c05e | 2374 | memset(hdr, 0, sizeof(*hdr)); |
3bbaaad9 | 2375 | fail_scsi_tasks(conn, sc->device->lun, DID_ERROR); |
843c0a8a | 2376 | conn->tmf_state = TMF_INITIAL; |
659743b0 | 2377 | spin_unlock_bh(&session->frwd_lock); |
843c0a8a MC |
2378 | |
2379 | iscsi_start_tx(conn); | |
2380 | goto done; | |
2381 | ||
2382 | unlock: | |
659743b0 | 2383 | spin_unlock_bh(&session->frwd_lock); |
843c0a8a | 2384 | done: |
bd2199d4 EZ |
2385 | ISCSI_DBG_EH(session, "dev reset result = %s\n", |
2386 | rc == SUCCESS ? "SUCCESS" : "FAILED"); | |
843c0a8a MC |
2387 | mutex_unlock(&session->eh_mutex); |
2388 | return rc; | |
2389 | } | |
2390 | EXPORT_SYMBOL_GPL(iscsi_eh_device_reset); | |
2391 | ||
3fe5ae8b MC |
2392 | void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session) |
2393 | { | |
2394 | struct iscsi_session *session = cls_session->dd_data; | |
2395 | ||
659743b0 | 2396 | spin_lock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2397 | if (session->state != ISCSI_STATE_LOGGED_IN) { |
2398 | session->state = ISCSI_STATE_RECOVERY_FAILED; | |
2399 | if (session->leadconn) | |
2400 | wake_up(&session->leadconn->ehwait); | |
2401 | } | |
659743b0 | 2402 | spin_unlock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2403 | } |
2404 | EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout); | |
2405 | ||
2406 | /** | |
2407 | * iscsi_eh_session_reset - drop session and attempt relogin | |
2408 | * @sc: scsi command | |
2409 | * | |
2410 | * This function will wait for a relogin, session termination from | |
2411 | * userspace, or a recovery/replacement timeout. | |
2412 | */ | |
309ce156 | 2413 | int iscsi_eh_session_reset(struct scsi_cmnd *sc) |
3fe5ae8b MC |
2414 | { |
2415 | struct iscsi_cls_session *cls_session; | |
2416 | struct iscsi_session *session; | |
2417 | struct iscsi_conn *conn; | |
2418 | ||
2419 | cls_session = starget_to_session(scsi_target(sc->device)); | |
2420 | session = cls_session->dd_data; | |
2421 | conn = session->leadconn; | |
2422 | ||
2423 | mutex_lock(&session->eh_mutex); | |
659743b0 | 2424 | spin_lock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2425 | if (session->state == ISCSI_STATE_TERMINATE) { |
2426 | failed: | |
2427 | ISCSI_DBG_EH(session, | |
2428 | "failing session reset: Could not log back into " | |
5db6dd14 FH |
2429 | "%s [age %d]\n", session->targetname, |
2430 | session->age); | |
659743b0 | 2431 | spin_unlock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2432 | mutex_unlock(&session->eh_mutex); |
2433 | return FAILED; | |
2434 | } | |
2435 | ||
659743b0 | 2436 | spin_unlock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2437 | mutex_unlock(&session->eh_mutex); |
2438 | /* | |
2439 | * we drop the lock here but the leadconn cannot be destoyed while | |
2440 | * we are in the scsi eh | |
2441 | */ | |
df4da5cd | 2442 | iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); |
3fe5ae8b MC |
2443 | |
2444 | ISCSI_DBG_EH(session, "wait for relogin\n"); | |
2445 | wait_event_interruptible(conn->ehwait, | |
2446 | session->state == ISCSI_STATE_TERMINATE || | |
2447 | session->state == ISCSI_STATE_LOGGED_IN || | |
2448 | session->state == ISCSI_STATE_RECOVERY_FAILED); | |
2449 | if (signal_pending(current)) | |
2450 | flush_signals(current); | |
2451 | ||
2452 | mutex_lock(&session->eh_mutex); | |
659743b0 | 2453 | spin_lock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2454 | if (session->state == ISCSI_STATE_LOGGED_IN) { |
2455 | ISCSI_DBG_EH(session, | |
2456 | "session reset succeeded for %s,%s\n", | |
2457 | session->targetname, conn->persistent_address); | |
2458 | } else | |
2459 | goto failed; | |
659743b0 | 2460 | spin_unlock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2461 | mutex_unlock(&session->eh_mutex); |
2462 | return SUCCESS; | |
2463 | } | |
309ce156 | 2464 | EXPORT_SYMBOL_GPL(iscsi_eh_session_reset); |
3fe5ae8b MC |
2465 | |
2466 | static void iscsi_prep_tgt_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr) | |
2467 | { | |
2468 | memset(hdr, 0, sizeof(*hdr)); | |
2469 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
2470 | hdr->flags = ISCSI_TM_FUNC_TARGET_WARM_RESET & ISCSI_FLAG_TM_FUNC_MASK; | |
2471 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
2472 | hdr->rtt = RESERVED_ITT; | |
2473 | } | |
2474 | ||
2475 | /** | |
2476 | * iscsi_eh_target_reset - reset target | |
2477 | * @sc: scsi command | |
2478 | * | |
309ce156 | 2479 | * This will attempt to send a warm target reset. |
3fe5ae8b | 2480 | */ |
3907adf6 | 2481 | static int iscsi_eh_target_reset(struct scsi_cmnd *sc) |
3fe5ae8b MC |
2482 | { |
2483 | struct iscsi_cls_session *cls_session; | |
2484 | struct iscsi_session *session; | |
2485 | struct iscsi_conn *conn; | |
2486 | struct iscsi_tm *hdr; | |
2487 | int rc = FAILED; | |
2488 | ||
2489 | cls_session = starget_to_session(scsi_target(sc->device)); | |
2490 | session = cls_session->dd_data; | |
2491 | ||
2492 | ISCSI_DBG_EH(session, "tgt Reset [sc %p tgt %s]\n", sc, | |
2493 | session->targetname); | |
2494 | ||
2495 | mutex_lock(&session->eh_mutex); | |
659743b0 | 2496 | spin_lock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2497 | /* |
2498 | * Just check if we are not logged in. We cannot check for | |
2499 | * the phase because the reset could come from a ioctl. | |
2500 | */ | |
2501 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN) | |
2502 | goto unlock; | |
2503 | conn = session->leadconn; | |
2504 | ||
2505 | /* only have one tmf outstanding at a time */ | |
2506 | if (conn->tmf_state != TMF_INITIAL) | |
2507 | goto unlock; | |
2508 | conn->tmf_state = TMF_QUEUED; | |
2509 | ||
2510 | hdr = &conn->tmhdr; | |
2511 | iscsi_prep_tgt_reset_pdu(sc, hdr); | |
2512 | ||
2513 | if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age, | |
2514 | session->tgt_reset_timeout)) { | |
2515 | rc = FAILED; | |
2516 | goto unlock; | |
2517 | } | |
2518 | ||
2519 | switch (conn->tmf_state) { | |
2520 | case TMF_SUCCESS: | |
2521 | break; | |
2522 | case TMF_TIMEDOUT: | |
659743b0 | 2523 | spin_unlock_bh(&session->frwd_lock); |
df4da5cd | 2524 | iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); |
3fe5ae8b MC |
2525 | goto done; |
2526 | default: | |
2527 | conn->tmf_state = TMF_INITIAL; | |
2528 | goto unlock; | |
2529 | } | |
2530 | ||
2531 | rc = SUCCESS; | |
659743b0 | 2532 | spin_unlock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2533 | |
2534 | iscsi_suspend_tx(conn); | |
2535 | ||
659743b0 | 2536 | spin_lock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2537 | memset(hdr, 0, sizeof(*hdr)); |
2538 | fail_scsi_tasks(conn, -1, DID_ERROR); | |
2539 | conn->tmf_state = TMF_INITIAL; | |
659743b0 | 2540 | spin_unlock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2541 | |
2542 | iscsi_start_tx(conn); | |
2543 | goto done; | |
2544 | ||
2545 | unlock: | |
659743b0 | 2546 | spin_unlock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2547 | done: |
2548 | ISCSI_DBG_EH(session, "tgt %s reset result = %s\n", session->targetname, | |
2549 | rc == SUCCESS ? "SUCCESS" : "FAILED"); | |
2550 | mutex_unlock(&session->eh_mutex); | |
309ce156 JK |
2551 | return rc; |
2552 | } | |
3fe5ae8b | 2553 | |
309ce156 JK |
2554 | /** |
2555 | * iscsi_eh_recover_target - reset target and possibly the session | |
2556 | * @sc: scsi command | |
2557 | * | |
2558 | * This will attempt to send a warm target reset. If that fails, | |
2559 | * we will escalate to ERL0 session recovery. | |
2560 | */ | |
2561 | int iscsi_eh_recover_target(struct scsi_cmnd *sc) | |
2562 | { | |
2563 | int rc; | |
2564 | ||
2565 | rc = iscsi_eh_target_reset(sc); | |
3fe5ae8b MC |
2566 | if (rc == FAILED) |
2567 | rc = iscsi_eh_session_reset(sc); | |
2568 | return rc; | |
2569 | } | |
309ce156 | 2570 | EXPORT_SYMBOL_GPL(iscsi_eh_recover_target); |
3fe5ae8b | 2571 | |
6320377f OK |
2572 | /* |
2573 | * Pre-allocate a pool of @max items of @item_size. By default, the pool | |
2574 | * should be accessed via kfifo_{get,put} on q->queue. | |
2575 | * Optionally, the caller can obtain the array of object pointers | |
2576 | * by passing in a non-NULL @items pointer | |
2577 | */ | |
7996a778 | 2578 | int |
6320377f | 2579 | iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size) |
7996a778 | 2580 | { |
6320377f | 2581 | int i, num_arrays = 1; |
7996a778 | 2582 | |
6320377f | 2583 | memset(q, 0, sizeof(*q)); |
7996a778 MC |
2584 | |
2585 | q->max = max; | |
6320377f OK |
2586 | |
2587 | /* If the user passed an items pointer, he wants a copy of | |
2588 | * the array. */ | |
2589 | if (items) | |
2590 | num_arrays++; | |
778e1cdd | 2591 | q->pool = kvcalloc(num_arrays * max, sizeof(void *), GFP_KERNEL); |
6320377f | 2592 | if (q->pool == NULL) |
f474a37b | 2593 | return -ENOMEM; |
7996a778 | 2594 | |
c1e13f25 | 2595 | kfifo_init(&q->queue, (void*)q->pool, max * sizeof(void*)); |
7996a778 MC |
2596 | |
2597 | for (i = 0; i < max; i++) { | |
6320377f | 2598 | q->pool[i] = kzalloc(item_size, GFP_KERNEL); |
7996a778 | 2599 | if (q->pool[i] == NULL) { |
6320377f OK |
2600 | q->max = i; |
2601 | goto enomem; | |
7996a778 | 2602 | } |
7acd72eb | 2603 | kfifo_in(&q->queue, (void*)&q->pool[i], sizeof(void*)); |
7996a778 | 2604 | } |
6320377f OK |
2605 | |
2606 | if (items) { | |
2607 | *items = q->pool + max; | |
2608 | memcpy(*items, q->pool, max * sizeof(void *)); | |
2609 | } | |
2610 | ||
7996a778 | 2611 | return 0; |
6320377f OK |
2612 | |
2613 | enomem: | |
2614 | iscsi_pool_free(q); | |
2615 | return -ENOMEM; | |
7996a778 MC |
2616 | } |
2617 | EXPORT_SYMBOL_GPL(iscsi_pool_init); | |
2618 | ||
6320377f | 2619 | void iscsi_pool_free(struct iscsi_pool *q) |
7996a778 MC |
2620 | { |
2621 | int i; | |
2622 | ||
2623 | for (i = 0; i < q->max; i++) | |
6320377f | 2624 | kfree(q->pool[i]); |
bfcc62ed | 2625 | kvfree(q->pool); |
7996a778 MC |
2626 | } |
2627 | EXPORT_SYMBOL_GPL(iscsi_pool_free); | |
2628 | ||
a4804cd6 MC |
2629 | /** |
2630 | * iscsi_host_add - add host to system | |
2631 | * @shost: scsi host | |
2632 | * @pdev: parent device | |
2633 | * | |
2634 | * This should be called by partial offload and software iscsi drivers | |
2635 | * to add a host to the system. | |
2636 | */ | |
2637 | int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev) | |
2638 | { | |
8e9a20ce MC |
2639 | if (!shost->can_queue) |
2640 | shost->can_queue = ISCSI_DEF_XMIT_CMDS_MAX; | |
2641 | ||
4d108350 MC |
2642 | if (!shost->cmd_per_lun) |
2643 | shost->cmd_per_lun = ISCSI_DEF_CMD_PER_LUN; | |
2644 | ||
a4804cd6 MC |
2645 | return scsi_add_host(shost, pdev); |
2646 | } | |
2647 | EXPORT_SYMBOL_GPL(iscsi_host_add); | |
2648 | ||
2649 | /** | |
2650 | * iscsi_host_alloc - allocate a host and driver data | |
2651 | * @sht: scsi host template | |
2652 | * @dd_data_size: driver host data size | |
32ae763e | 2653 | * @xmit_can_sleep: bool indicating if LLD will queue IO from a work queue |
a4804cd6 MC |
2654 | * |
2655 | * This should be called by partial offload and software iscsi drivers. | |
2656 | * To access the driver specific memory use the iscsi_host_priv() macro. | |
2657 | */ | |
2658 | struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht, | |
4d108350 | 2659 | int dd_data_size, bool xmit_can_sleep) |
75613521 | 2660 | { |
a4804cd6 | 2661 | struct Scsi_Host *shost; |
e5bd7b54 | 2662 | struct iscsi_host *ihost; |
a4804cd6 MC |
2663 | |
2664 | shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size); | |
2665 | if (!shost) | |
2666 | return NULL; | |
e5bd7b54 | 2667 | ihost = shost_priv(shost); |
32ae763e MC |
2668 | |
2669 | if (xmit_can_sleep) { | |
2670 | snprintf(ihost->workq_name, sizeof(ihost->workq_name), | |
2671 | "iscsi_q_%d", shost->host_no); | |
2672 | ihost->workq = create_singlethread_workqueue(ihost->workq_name); | |
2673 | if (!ihost->workq) | |
2674 | goto free_host; | |
2675 | } | |
2676 | ||
e5bd7b54 MC |
2677 | spin_lock_init(&ihost->lock); |
2678 | ihost->state = ISCSI_HOST_SETUP; | |
2679 | ihost->num_sessions = 0; | |
2680 | init_waitqueue_head(&ihost->session_removal_wq); | |
a4804cd6 | 2681 | return shost; |
32ae763e MC |
2682 | |
2683 | free_host: | |
2684 | scsi_host_put(shost); | |
2685 | return NULL; | |
a4804cd6 MC |
2686 | } |
2687 | EXPORT_SYMBOL_GPL(iscsi_host_alloc); | |
2688 | ||
e5bd7b54 MC |
2689 | static void iscsi_notify_host_removed(struct iscsi_cls_session *cls_session) |
2690 | { | |
40a06e75 | 2691 | iscsi_session_failure(cls_session->dd_data, ISCSI_ERR_INVALID_HOST); |
e5bd7b54 MC |
2692 | } |
2693 | ||
a4804cd6 MC |
2694 | /** |
2695 | * iscsi_host_remove - remove host and sessions | |
2696 | * @shost: scsi host | |
2697 | * | |
e5bd7b54 MC |
2698 | * If there are any sessions left, this will initiate the removal and wait |
2699 | * for the completion. | |
a4804cd6 MC |
2700 | */ |
2701 | void iscsi_host_remove(struct Scsi_Host *shost) | |
2702 | { | |
e5bd7b54 MC |
2703 | struct iscsi_host *ihost = shost_priv(shost); |
2704 | unsigned long flags; | |
2705 | ||
2706 | spin_lock_irqsave(&ihost->lock, flags); | |
2707 | ihost->state = ISCSI_HOST_REMOVED; | |
2708 | spin_unlock_irqrestore(&ihost->lock, flags); | |
2709 | ||
2710 | iscsi_host_for_each_session(shost, iscsi_notify_host_removed); | |
2711 | wait_event_interruptible(ihost->session_removal_wq, | |
2712 | ihost->num_sessions == 0); | |
2713 | if (signal_pending(current)) | |
2714 | flush_signals(current); | |
2715 | ||
a4804cd6 | 2716 | scsi_remove_host(shost); |
32ae763e MC |
2717 | if (ihost->workq) |
2718 | destroy_workqueue(ihost->workq); | |
75613521 | 2719 | } |
a4804cd6 | 2720 | EXPORT_SYMBOL_GPL(iscsi_host_remove); |
7996a778 | 2721 | |
a4804cd6 | 2722 | void iscsi_host_free(struct Scsi_Host *shost) |
75613521 MC |
2723 | { |
2724 | struct iscsi_host *ihost = shost_priv(shost); | |
7996a778 | 2725 | |
75613521 MC |
2726 | kfree(ihost->netdev); |
2727 | kfree(ihost->hwaddress); | |
2728 | kfree(ihost->initiatorname); | |
a4804cd6 | 2729 | scsi_host_put(shost); |
75613521 | 2730 | } |
a4804cd6 | 2731 | EXPORT_SYMBOL_GPL(iscsi_host_free); |
7996a778 | 2732 | |
e5bd7b54 MC |
2733 | static void iscsi_host_dec_session_cnt(struct Scsi_Host *shost) |
2734 | { | |
2735 | struct iscsi_host *ihost = shost_priv(shost); | |
2736 | unsigned long flags; | |
2737 | ||
2738 | shost = scsi_host_get(shost); | |
2739 | if (!shost) { | |
2740 | printk(KERN_ERR "Invalid state. Cannot notify host removal " | |
2741 | "of session teardown event because host already " | |
2742 | "removed.\n"); | |
2743 | return; | |
2744 | } | |
2745 | ||
2746 | spin_lock_irqsave(&ihost->lock, flags); | |
2747 | ihost->num_sessions--; | |
2748 | if (ihost->num_sessions == 0) | |
2749 | wake_up(&ihost->session_removal_wq); | |
2750 | spin_unlock_irqrestore(&ihost->lock, flags); | |
2751 | scsi_host_put(shost); | |
2752 | } | |
2753 | ||
7996a778 MC |
2754 | /** |
2755 | * iscsi_session_setup - create iscsi cls session and host and session | |
7996a778 | 2756 | * @iscsit: iscsi transport template |
75613521 MC |
2757 | * @shost: scsi host |
2758 | * @cmds_max: session can queue | |
ccd4a430 | 2759 | * @dd_size: private driver data size, added to session allocation size |
9c19a7d0 | 2760 | * @cmd_task_size: LLD task private data size |
7996a778 | 2761 | * @initial_cmdsn: initial CmdSN |
ccd4a430 | 2762 | * @id: target ID to add to this session |
7996a778 MC |
2763 | * |
2764 | * This can be used by software iscsi_transports that allocate | |
2765 | * a session per scsi host. | |
3cf7b233 MC |
2766 | * |
2767 | * Callers should set cmds_max to the largest total numer (mgmt + scsi) of | |
2768 | * tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks | |
2769 | * for nop handling and login/logout requests. | |
75613521 | 2770 | */ |
7996a778 | 2771 | struct iscsi_cls_session * |
75613521 | 2772 | iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost, |
b8b9e1b8 | 2773 | uint16_t cmds_max, int dd_size, int cmd_task_size, |
7970634b | 2774 | uint32_t initial_cmdsn, unsigned int id) |
7996a778 | 2775 | { |
e5bd7b54 | 2776 | struct iscsi_host *ihost = shost_priv(shost); |
7996a778 MC |
2777 | struct iscsi_session *session; |
2778 | struct iscsi_cls_session *cls_session; | |
3cf7b233 | 2779 | int cmd_i, scsi_cmds, total_cmds = cmds_max; |
e5bd7b54 MC |
2780 | unsigned long flags; |
2781 | ||
2782 | spin_lock_irqsave(&ihost->lock, flags); | |
2783 | if (ihost->state == ISCSI_HOST_REMOVED) { | |
2784 | spin_unlock_irqrestore(&ihost->lock, flags); | |
2785 | return NULL; | |
2786 | } | |
2787 | ihost->num_sessions++; | |
2788 | spin_unlock_irqrestore(&ihost->lock, flags); | |
8e9a20ce MC |
2789 | |
2790 | if (!total_cmds) | |
2791 | total_cmds = ISCSI_DEF_XMIT_CMDS_MAX; | |
3e5c28ad | 2792 | /* |
3cf7b233 MC |
2793 | * The iscsi layer needs some tasks for nop handling and tmfs, |
2794 | * so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX | |
2795 | * + 1 command for scsi IO. | |
3e5c28ad | 2796 | */ |
3cf7b233 MC |
2797 | if (total_cmds < ISCSI_TOTAL_CMDS_MIN) { |
2798 | printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " | |
2799 | "must be a power of two that is at least %d.\n", | |
2800 | total_cmds, ISCSI_TOTAL_CMDS_MIN); | |
e5bd7b54 | 2801 | goto dec_session_count; |
3cf7b233 MC |
2802 | } |
2803 | ||
2804 | if (total_cmds > ISCSI_TOTAL_CMDS_MAX) { | |
2805 | printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " | |
2806 | "must be a power of 2 less than or equal to %d.\n", | |
2807 | cmds_max, ISCSI_TOTAL_CMDS_MAX); | |
2808 | total_cmds = ISCSI_TOTAL_CMDS_MAX; | |
2809 | } | |
2810 | ||
2811 | if (!is_power_of_2(total_cmds)) { | |
2812 | printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " | |
2813 | "must be a power of 2.\n", total_cmds); | |
2814 | total_cmds = rounddown_pow_of_two(total_cmds); | |
2815 | if (total_cmds < ISCSI_TOTAL_CMDS_MIN) | |
2816 | return NULL; | |
2817 | printk(KERN_INFO "iscsi: Rounding can_queue to %d.\n", | |
2818 | total_cmds); | |
1548271e | 2819 | } |
3cf7b233 | 2820 | scsi_cmds = total_cmds - ISCSI_MGMT_CMDS_MAX; |
1548271e | 2821 | |
5d91e209 | 2822 | cls_session = iscsi_alloc_session(shost, iscsit, |
b8b9e1b8 JK |
2823 | sizeof(struct iscsi_session) + |
2824 | dd_size); | |
75613521 | 2825 | if (!cls_session) |
e5bd7b54 | 2826 | goto dec_session_count; |
75613521 MC |
2827 | session = cls_session->dd_data; |
2828 | session->cls_session = cls_session; | |
7996a778 MC |
2829 | session->host = shost; |
2830 | session->state = ISCSI_STATE_FREE; | |
f6d5180c | 2831 | session->fast_abort = 1; |
3fe5ae8b | 2832 | session->tgt_reset_timeout = 30; |
4cd49ea1 MC |
2833 | session->lu_reset_timeout = 15; |
2834 | session->abort_timeout = 10; | |
3cf7b233 MC |
2835 | session->scsi_cmds_max = scsi_cmds; |
2836 | session->cmds_max = total_cmds; | |
e0726407 | 2837 | session->queued_cmdsn = session->cmdsn = initial_cmdsn; |
7996a778 MC |
2838 | session->exp_cmdsn = initial_cmdsn + 1; |
2839 | session->max_cmdsn = initial_cmdsn + 1; | |
2840 | session->max_r2t = 1; | |
2841 | session->tt = iscsit; | |
b8b9e1b8 | 2842 | session->dd_data = cls_session->dd_data + sizeof(*session); |
659743b0 | 2843 | |
6724add1 | 2844 | mutex_init(&session->eh_mutex); |
659743b0 SP |
2845 | spin_lock_init(&session->frwd_lock); |
2846 | spin_lock_init(&session->back_lock); | |
7996a778 MC |
2847 | |
2848 | /* initialize SCSI PDU commands pool */ | |
2849 | if (iscsi_pool_init(&session->cmdpool, session->cmds_max, | |
2850 | (void***)&session->cmds, | |
9c19a7d0 | 2851 | cmd_task_size + sizeof(struct iscsi_task))) |
7996a778 MC |
2852 | goto cmdpool_alloc_fail; |
2853 | ||
2854 | /* pre-format cmds pool with ITT */ | |
2855 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
9c19a7d0 | 2856 | struct iscsi_task *task = session->cmds[cmd_i]; |
7996a778 | 2857 | |
9c19a7d0 MC |
2858 | if (cmd_task_size) |
2859 | task->dd_data = &task[1]; | |
2860 | task->itt = cmd_i; | |
3bbaaad9 | 2861 | task->state = ISCSI_TASK_FREE; |
9c19a7d0 | 2862 | INIT_LIST_HEAD(&task->running); |
7996a778 MC |
2863 | } |
2864 | ||
f53a88da | 2865 | if (!try_module_get(iscsit->owner)) |
75613521 | 2866 | goto module_get_fail; |
7996a778 | 2867 | |
7970634b | 2868 | if (iscsi_add_session(cls_session, id)) |
75613521 | 2869 | goto cls_session_fail; |
e5bd7b54 | 2870 | |
7996a778 MC |
2871 | return cls_session; |
2872 | ||
2873 | cls_session_fail: | |
75613521 MC |
2874 | module_put(iscsit->owner); |
2875 | module_get_fail: | |
6320377f | 2876 | iscsi_pool_free(&session->cmdpool); |
7996a778 | 2877 | cmdpool_alloc_fail: |
75613521 | 2878 | iscsi_free_session(cls_session); |
e5bd7b54 MC |
2879 | dec_session_count: |
2880 | iscsi_host_dec_session_cnt(shost); | |
7996a778 MC |
2881 | return NULL; |
2882 | } | |
2883 | EXPORT_SYMBOL_GPL(iscsi_session_setup); | |
2884 | ||
2885 | /** | |
2886 | * iscsi_session_teardown - destroy session, host, and cls_session | |
75613521 | 2887 | * @cls_session: iscsi session |
75613521 | 2888 | */ |
7996a778 MC |
2889 | void iscsi_session_teardown(struct iscsi_cls_session *cls_session) |
2890 | { | |
75613521 | 2891 | struct iscsi_session *session = cls_session->dd_data; |
63f75cc8 | 2892 | struct module *owner = cls_session->transport->owner; |
e5bd7b54 | 2893 | struct Scsi_Host *shost = session->host; |
7996a778 | 2894 | |
6320377f | 2895 | iscsi_pool_free(&session->cmdpool); |
7996a778 | 2896 | |
9e10b512 KK |
2897 | iscsi_remove_session(cls_session); |
2898 | ||
b2c64167 MC |
2899 | kfree(session->password); |
2900 | kfree(session->password_in); | |
2901 | kfree(session->username); | |
2902 | kfree(session->username_in); | |
f3ff0c36 | 2903 | kfree(session->targetname); |
3c5c4801 | 2904 | kfree(session->targetalias); |
88dfd340 | 2905 | kfree(session->initiatorname); |
3b9373e9 EW |
2906 | kfree(session->boot_root); |
2907 | kfree(session->boot_nic); | |
2908 | kfree(session->boot_target); | |
88dfd340 | 2909 | kfree(session->ifacename); |
f8525eb4 AC |
2910 | kfree(session->portal_type); |
2911 | kfree(session->discovery_parent_type); | |
f3ff0c36 | 2912 | |
9e10b512 KK |
2913 | iscsi_free_session(cls_session); |
2914 | ||
e5bd7b54 | 2915 | iscsi_host_dec_session_cnt(shost); |
63f75cc8 | 2916 | module_put(owner); |
7996a778 MC |
2917 | } |
2918 | EXPORT_SYMBOL_GPL(iscsi_session_teardown); | |
2919 | ||
2920 | /** | |
2921 | * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn | |
2922 | * @cls_session: iscsi_cls_session | |
5d91e209 | 2923 | * @dd_size: private driver data size |
7996a778 | 2924 | * @conn_idx: cid |
5d91e209 | 2925 | */ |
7996a778 | 2926 | struct iscsi_cls_conn * |
5d91e209 MC |
2927 | iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size, |
2928 | uint32_t conn_idx) | |
7996a778 | 2929 | { |
75613521 | 2930 | struct iscsi_session *session = cls_session->dd_data; |
7996a778 MC |
2931 | struct iscsi_conn *conn; |
2932 | struct iscsi_cls_conn *cls_conn; | |
d36ab6f3 | 2933 | char *data; |
7996a778 | 2934 | |
5d91e209 MC |
2935 | cls_conn = iscsi_create_conn(cls_session, sizeof(*conn) + dd_size, |
2936 | conn_idx); | |
7996a778 MC |
2937 | if (!cls_conn) |
2938 | return NULL; | |
2939 | conn = cls_conn->dd_data; | |
5d91e209 | 2940 | memset(conn, 0, sizeof(*conn) + dd_size); |
7996a778 | 2941 | |
5d91e209 | 2942 | conn->dd_data = cls_conn->dd_data + sizeof(*conn); |
7996a778 MC |
2943 | conn->session = session; |
2944 | conn->cls_conn = cls_conn; | |
2945 | conn->c_stage = ISCSI_CONN_INITIAL_STAGE; | |
2946 | conn->id = conn_idx; | |
2947 | conn->exp_statsn = 0; | |
843c0a8a | 2948 | conn->tmf_state = TMF_INITIAL; |
f6d5180c | 2949 | |
2c4b9637 | 2950 | timer_setup(&conn->transport_timer, iscsi_check_transport_timeouts, 0); |
f6d5180c | 2951 | |
843c0a8a | 2952 | INIT_LIST_HEAD(&conn->mgmtqueue); |
3bbaaad9 | 2953 | INIT_LIST_HEAD(&conn->cmdqueue); |
843c0a8a | 2954 | INIT_LIST_HEAD(&conn->requeue); |
6f8830f5 | 2955 | spin_lock_init(&conn->taskqueuelock); |
c4028958 | 2956 | INIT_WORK(&conn->xmitwork, iscsi_xmitworker); |
7996a778 | 2957 | |
9c19a7d0 | 2958 | /* allocate login_task used for the login/text sequences */ |
659743b0 | 2959 | spin_lock_bh(&session->frwd_lock); |
7acd72eb | 2960 | if (!kfifo_out(&session->cmdpool.queue, |
9c19a7d0 | 2961 | (void*)&conn->login_task, |
7996a778 | 2962 | sizeof(void*))) { |
659743b0 | 2963 | spin_unlock_bh(&session->frwd_lock); |
9c19a7d0 | 2964 | goto login_task_alloc_fail; |
7996a778 | 2965 | } |
659743b0 | 2966 | spin_unlock_bh(&session->frwd_lock); |
7996a778 | 2967 | |
cfeb2cf9 MC |
2968 | data = (char *) __get_free_pages(GFP_KERNEL, |
2969 | get_order(ISCSI_DEF_MAX_RECV_SEG_LEN)); | |
d36ab6f3 | 2970 | if (!data) |
9c19a7d0 MC |
2971 | goto login_task_data_alloc_fail; |
2972 | conn->login_task->data = conn->data = data; | |
d36ab6f3 | 2973 | |
2c4b9637 | 2974 | timer_setup(&conn->tmf_timer, iscsi_tmf_timedout, 0); |
7996a778 MC |
2975 | init_waitqueue_head(&conn->ehwait); |
2976 | ||
2977 | return cls_conn; | |
2978 | ||
9c19a7d0 | 2979 | login_task_data_alloc_fail: |
7acd72eb | 2980 | kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task, |
d36ab6f3 | 2981 | sizeof(void*)); |
9c19a7d0 | 2982 | login_task_alloc_fail: |
7996a778 MC |
2983 | iscsi_destroy_conn(cls_conn); |
2984 | return NULL; | |
2985 | } | |
2986 | EXPORT_SYMBOL_GPL(iscsi_conn_setup); | |
2987 | ||
2988 | /** | |
2989 | * iscsi_conn_teardown - teardown iscsi connection | |
ccd4a430 | 2990 | * @cls_conn: iscsi class connection |
7996a778 MC |
2991 | * |
2992 | * TODO: we may need to make this into a two step process | |
2993 | * like scsi-mls remove + put host | |
2994 | */ | |
2995 | void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn) | |
2996 | { | |
2997 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2998 | struct iscsi_session *session = conn->session; | |
7996a778 | 2999 | |
f6d5180c MC |
3000 | del_timer_sync(&conn->transport_timer); |
3001 | ||
660d0831 | 3002 | mutex_lock(&session->eh_mutex); |
659743b0 | 3003 | spin_lock_bh(&session->frwd_lock); |
7996a778 MC |
3004 | conn->c_stage = ISCSI_CONN_CLEANUP_WAIT; |
3005 | if (session->leadconn == conn) { | |
3006 | /* | |
3007 | * leading connection? then give up on recovery. | |
3008 | */ | |
3009 | session->state = ISCSI_STATE_TERMINATE; | |
3010 | wake_up(&conn->ehwait); | |
3011 | } | |
659743b0 | 3012 | spin_unlock_bh(&session->frwd_lock); |
7996a778 | 3013 | |
779ea120 | 3014 | /* flush queued up work because we free the connection below */ |
843c0a8a | 3015 | iscsi_suspend_tx(conn); |
779ea120 | 3016 | |
659743b0 | 3017 | spin_lock_bh(&session->frwd_lock); |
cfeb2cf9 MC |
3018 | free_pages((unsigned long) conn->data, |
3019 | get_order(ISCSI_DEF_MAX_RECV_SEG_LEN)); | |
f3ff0c36 | 3020 | kfree(conn->persistent_address); |
ae56ff40 | 3021 | kfree(conn->local_ipaddr); |
659743b0 SP |
3022 | /* regular RX path uses back_lock */ |
3023 | spin_lock_bh(&session->back_lock); | |
7acd72eb | 3024 | kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task, |
7996a778 | 3025 | sizeof(void*)); |
659743b0 | 3026 | spin_unlock_bh(&session->back_lock); |
e0726407 | 3027 | if (session->leadconn == conn) |
7996a778 | 3028 | session->leadconn = NULL; |
659743b0 | 3029 | spin_unlock_bh(&session->frwd_lock); |
660d0831 | 3030 | mutex_unlock(&session->eh_mutex); |
7996a778 | 3031 | |
7996a778 MC |
3032 | iscsi_destroy_conn(cls_conn); |
3033 | } | |
3034 | EXPORT_SYMBOL_GPL(iscsi_conn_teardown); | |
3035 | ||
3036 | int iscsi_conn_start(struct iscsi_cls_conn *cls_conn) | |
3037 | { | |
3038 | struct iscsi_conn *conn = cls_conn->dd_data; | |
3039 | struct iscsi_session *session = conn->session; | |
3040 | ||
ffd0436e | 3041 | if (!session) { |
322d739d MC |
3042 | iscsi_conn_printk(KERN_ERR, conn, |
3043 | "can't start unbound connection\n"); | |
7996a778 MC |
3044 | return -EPERM; |
3045 | } | |
3046 | ||
db98ccde MC |
3047 | if ((session->imm_data_en || !session->initial_r2t_en) && |
3048 | session->first_burst > session->max_burst) { | |
322d739d MC |
3049 | iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: " |
3050 | "first_burst %d max_burst %d\n", | |
3051 | session->first_burst, session->max_burst); | |
ffd0436e MC |
3052 | return -EINVAL; |
3053 | } | |
3054 | ||
f6d5180c | 3055 | if (conn->ping_timeout && !conn->recv_timeout) { |
322d739d MC |
3056 | iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of " |
3057 | "zero. Using 5 seconds\n."); | |
f6d5180c MC |
3058 | conn->recv_timeout = 5; |
3059 | } | |
3060 | ||
3061 | if (conn->recv_timeout && !conn->ping_timeout) { | |
322d739d MC |
3062 | iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of " |
3063 | "zero. Using 5 seconds.\n"); | |
f6d5180c MC |
3064 | conn->ping_timeout = 5; |
3065 | } | |
3066 | ||
659743b0 | 3067 | spin_lock_bh(&session->frwd_lock); |
7996a778 MC |
3068 | conn->c_stage = ISCSI_CONN_STARTED; |
3069 | session->state = ISCSI_STATE_LOGGED_IN; | |
e0726407 | 3070 | session->queued_cmdsn = session->cmdsn; |
7996a778 | 3071 | |
f6d5180c MC |
3072 | conn->last_recv = jiffies; |
3073 | conn->last_ping = jiffies; | |
3074 | if (conn->recv_timeout && conn->ping_timeout) | |
3075 | mod_timer(&conn->transport_timer, | |
3076 | jiffies + (conn->recv_timeout * HZ)); | |
3077 | ||
7996a778 MC |
3078 | switch(conn->stop_stage) { |
3079 | case STOP_CONN_RECOVER: | |
3080 | /* | |
3081 | * unblock eh_abort() if it is blocked. re-try all | |
3082 | * commands after successful recovery | |
3083 | */ | |
7996a778 | 3084 | conn->stop_stage = 0; |
843c0a8a | 3085 | conn->tmf_state = TMF_INITIAL; |
7996a778 | 3086 | session->age++; |
8b1d0343 MC |
3087 | if (session->age == 16) |
3088 | session->age = 0; | |
6eabafbe | 3089 | break; |
7996a778 | 3090 | case STOP_CONN_TERM: |
7996a778 | 3091 | conn->stop_stage = 0; |
7996a778 MC |
3092 | break; |
3093 | default: | |
3094 | break; | |
3095 | } | |
659743b0 | 3096 | spin_unlock_bh(&session->frwd_lock); |
7996a778 | 3097 | |
75613521 | 3098 | iscsi_unblock_session(session->cls_session); |
6eabafbe | 3099 | wake_up(&conn->ehwait); |
7996a778 MC |
3100 | return 0; |
3101 | } | |
3102 | EXPORT_SYMBOL_GPL(iscsi_conn_start); | |
3103 | ||
3104 | static void | |
3bbaaad9 | 3105 | fail_mgmt_tasks(struct iscsi_session *session, struct iscsi_conn *conn) |
7996a778 | 3106 | { |
3bbaaad9 | 3107 | struct iscsi_task *task; |
b3cd5050 | 3108 | int i, state; |
7996a778 | 3109 | |
3bbaaad9 MC |
3110 | for (i = 0; i < conn->session->cmds_max; i++) { |
3111 | task = conn->session->cmds[i]; | |
3112 | if (task->sc) | |
3113 | continue; | |
7996a778 | 3114 | |
3bbaaad9 MC |
3115 | if (task->state == ISCSI_TASK_FREE) |
3116 | continue; | |
7996a778 | 3117 | |
3bbaaad9 MC |
3118 | ISCSI_DBG_SESSION(conn->session, |
3119 | "failing mgmt itt 0x%x state %d\n", | |
3120 | task->itt, task->state); | |
b3cd5050 MC |
3121 | state = ISCSI_TASK_ABRT_SESS_RECOV; |
3122 | if (task->state == ISCSI_TASK_PENDING) | |
3123 | state = ISCSI_TASK_COMPLETED; | |
3124 | iscsi_complete_task(task, state); | |
3125 | ||
3bbaaad9 | 3126 | } |
7996a778 MC |
3127 | } |
3128 | ||
656cffc9 MC |
3129 | static void iscsi_start_session_recovery(struct iscsi_session *session, |
3130 | struct iscsi_conn *conn, int flag) | |
7996a778 | 3131 | { |
ed2abc7f MC |
3132 | int old_stop_stage; |
3133 | ||
6724add1 | 3134 | mutex_lock(&session->eh_mutex); |
659743b0 | 3135 | spin_lock_bh(&session->frwd_lock); |
ed2abc7f | 3136 | if (conn->stop_stage == STOP_CONN_TERM) { |
659743b0 | 3137 | spin_unlock_bh(&session->frwd_lock); |
6724add1 MC |
3138 | mutex_unlock(&session->eh_mutex); |
3139 | return; | |
3140 | } | |
3141 | ||
ed2abc7f MC |
3142 | /* |
3143 | * When this is called for the in_login state, we only want to clean | |
9c19a7d0 | 3144 | * up the login task and connection. We do not need to block and set |
67a61114 | 3145 | * the recovery state again |
ed2abc7f | 3146 | */ |
67a61114 MC |
3147 | if (flag == STOP_CONN_TERM) |
3148 | session->state = ISCSI_STATE_TERMINATE; | |
3149 | else if (conn->stop_stage != STOP_CONN_RECOVER) | |
3150 | session->state = ISCSI_STATE_IN_RECOVERY; | |
4ae0a6c1 MC |
3151 | |
3152 | old_stop_stage = conn->stop_stage; | |
3153 | conn->stop_stage = flag; | |
659743b0 | 3154 | spin_unlock_bh(&session->frwd_lock); |
ed2abc7f | 3155 | |
26013ad4 MC |
3156 | del_timer_sync(&conn->transport_timer); |
3157 | iscsi_suspend_tx(conn); | |
3158 | ||
659743b0 | 3159 | spin_lock_bh(&session->frwd_lock); |
67a61114 | 3160 | conn->c_stage = ISCSI_CONN_STOPPED; |
659743b0 | 3161 | spin_unlock_bh(&session->frwd_lock); |
6724add1 | 3162 | |
7996a778 MC |
3163 | /* |
3164 | * for connection level recovery we should not calculate | |
3165 | * header digest. conn->hdr_size used for optimization | |
3166 | * in hdr_extract() and will be re-negotiated at | |
3167 | * set_param() time. | |
3168 | */ | |
3169 | if (flag == STOP_CONN_RECOVER) { | |
3170 | conn->hdrdgst_en = 0; | |
3171 | conn->datadgst_en = 0; | |
656cffc9 | 3172 | if (session->state == ISCSI_STATE_IN_RECOVERY && |
67a61114 | 3173 | old_stop_stage != STOP_CONN_RECOVER) { |
1b2c7af8 | 3174 | ISCSI_DBG_SESSION(session, "blocking session\n"); |
75613521 | 3175 | iscsi_block_session(session->cls_session); |
67a61114 | 3176 | } |
7996a778 | 3177 | } |
656cffc9 | 3178 | |
656cffc9 MC |
3179 | /* |
3180 | * flush queues. | |
3181 | */ | |
659743b0 | 3182 | spin_lock_bh(&session->frwd_lock); |
b3cd5050 | 3183 | fail_scsi_tasks(conn, -1, DID_TRANSPORT_DISRUPTED); |
3bbaaad9 | 3184 | fail_mgmt_tasks(session, conn); |
5d12c05e | 3185 | memset(&conn->tmhdr, 0, sizeof(conn->tmhdr)); |
659743b0 | 3186 | spin_unlock_bh(&session->frwd_lock); |
6724add1 | 3187 | mutex_unlock(&session->eh_mutex); |
7996a778 | 3188 | } |
7996a778 MC |
3189 | |
3190 | void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) | |
3191 | { | |
3192 | struct iscsi_conn *conn = cls_conn->dd_data; | |
3193 | struct iscsi_session *session = conn->session; | |
3194 | ||
3195 | switch (flag) { | |
3196 | case STOP_CONN_RECOVER: | |
3197 | case STOP_CONN_TERM: | |
3198 | iscsi_start_session_recovery(session, conn, flag); | |
8d2860b3 | 3199 | break; |
7996a778 | 3200 | default: |
322d739d MC |
3201 | iscsi_conn_printk(KERN_ERR, conn, |
3202 | "invalid stop flag %d\n", flag); | |
7996a778 MC |
3203 | } |
3204 | } | |
3205 | EXPORT_SYMBOL_GPL(iscsi_conn_stop); | |
3206 | ||
3207 | int iscsi_conn_bind(struct iscsi_cls_session *cls_session, | |
3208 | struct iscsi_cls_conn *cls_conn, int is_leading) | |
3209 | { | |
75613521 | 3210 | struct iscsi_session *session = cls_session->dd_data; |
98644047 | 3211 | struct iscsi_conn *conn = cls_conn->dd_data; |
7996a778 | 3212 | |
659743b0 | 3213 | spin_lock_bh(&session->frwd_lock); |
7996a778 MC |
3214 | if (is_leading) |
3215 | session->leadconn = conn; | |
659743b0 | 3216 | spin_unlock_bh(&session->frwd_lock); |
7996a778 MC |
3217 | |
3218 | /* | |
3219 | * Unblock xmitworker(), Login Phase will pass through. | |
3220 | */ | |
3221 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
3222 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
3223 | return 0; | |
3224 | } | |
3225 | EXPORT_SYMBOL_GPL(iscsi_conn_bind); | |
3226 | ||
adaf6990 | 3227 | int iscsi_switch_str_param(char **param, char *new_val_buf) |
5700b1af MC |
3228 | { |
3229 | char *new_val; | |
3230 | ||
3231 | if (*param) { | |
3232 | if (!strcmp(*param, new_val_buf)) | |
3233 | return 0; | |
3234 | } | |
3235 | ||
3236 | new_val = kstrdup(new_val_buf, GFP_NOIO); | |
3237 | if (!new_val) | |
3238 | return -ENOMEM; | |
3239 | ||
3240 | kfree(*param); | |
3241 | *param = new_val; | |
3242 | return 0; | |
3243 | } | |
adaf6990 | 3244 | EXPORT_SYMBOL_GPL(iscsi_switch_str_param); |
a54a52ca MC |
3245 | |
3246 | int iscsi_set_param(struct iscsi_cls_conn *cls_conn, | |
3247 | enum iscsi_param param, char *buf, int buflen) | |
3248 | { | |
3249 | struct iscsi_conn *conn = cls_conn->dd_data; | |
3250 | struct iscsi_session *session = conn->session; | |
6a06a4b8 | 3251 | int val; |
a54a52ca MC |
3252 | |
3253 | switch(param) { | |
843c0a8a MC |
3254 | case ISCSI_PARAM_FAST_ABORT: |
3255 | sscanf(buf, "%d", &session->fast_abort); | |
3256 | break; | |
f6d5180c MC |
3257 | case ISCSI_PARAM_ABORT_TMO: |
3258 | sscanf(buf, "%d", &session->abort_timeout); | |
3259 | break; | |
3260 | case ISCSI_PARAM_LU_RESET_TMO: | |
3261 | sscanf(buf, "%d", &session->lu_reset_timeout); | |
3262 | break; | |
3fe5ae8b MC |
3263 | case ISCSI_PARAM_TGT_RESET_TMO: |
3264 | sscanf(buf, "%d", &session->tgt_reset_timeout); | |
3265 | break; | |
f6d5180c MC |
3266 | case ISCSI_PARAM_PING_TMO: |
3267 | sscanf(buf, "%d", &conn->ping_timeout); | |
3268 | break; | |
3269 | case ISCSI_PARAM_RECV_TMO: | |
3270 | sscanf(buf, "%d", &conn->recv_timeout); | |
3271 | break; | |
a54a52ca MC |
3272 | case ISCSI_PARAM_MAX_RECV_DLENGTH: |
3273 | sscanf(buf, "%d", &conn->max_recv_dlength); | |
3274 | break; | |
3275 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
3276 | sscanf(buf, "%d", &conn->max_xmit_dlength); | |
3277 | break; | |
3278 | case ISCSI_PARAM_HDRDGST_EN: | |
3279 | sscanf(buf, "%d", &conn->hdrdgst_en); | |
3280 | break; | |
3281 | case ISCSI_PARAM_DATADGST_EN: | |
3282 | sscanf(buf, "%d", &conn->datadgst_en); | |
3283 | break; | |
3284 | case ISCSI_PARAM_INITIAL_R2T_EN: | |
3285 | sscanf(buf, "%d", &session->initial_r2t_en); | |
3286 | break; | |
3287 | case ISCSI_PARAM_MAX_R2T: | |
1304be5f | 3288 | sscanf(buf, "%hu", &session->max_r2t); |
a54a52ca MC |
3289 | break; |
3290 | case ISCSI_PARAM_IMM_DATA_EN: | |
3291 | sscanf(buf, "%d", &session->imm_data_en); | |
3292 | break; | |
3293 | case ISCSI_PARAM_FIRST_BURST: | |
3294 | sscanf(buf, "%d", &session->first_burst); | |
3295 | break; | |
3296 | case ISCSI_PARAM_MAX_BURST: | |
3297 | sscanf(buf, "%d", &session->max_burst); | |
3298 | break; | |
3299 | case ISCSI_PARAM_PDU_INORDER_EN: | |
3300 | sscanf(buf, "%d", &session->pdu_inorder_en); | |
3301 | break; | |
3302 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
3303 | sscanf(buf, "%d", &session->dataseq_inorder_en); | |
3304 | break; | |
3305 | case ISCSI_PARAM_ERL: | |
3306 | sscanf(buf, "%d", &session->erl); | |
3307 | break; | |
a54a52ca MC |
3308 | case ISCSI_PARAM_EXP_STATSN: |
3309 | sscanf(buf, "%u", &conn->exp_statsn); | |
3310 | break; | |
b2c64167 | 3311 | case ISCSI_PARAM_USERNAME: |
5700b1af | 3312 | return iscsi_switch_str_param(&session->username, buf); |
b2c64167 | 3313 | case ISCSI_PARAM_USERNAME_IN: |
5700b1af | 3314 | return iscsi_switch_str_param(&session->username_in, buf); |
b2c64167 | 3315 | case ISCSI_PARAM_PASSWORD: |
5700b1af | 3316 | return iscsi_switch_str_param(&session->password, buf); |
b2c64167 | 3317 | case ISCSI_PARAM_PASSWORD_IN: |
5700b1af | 3318 | return iscsi_switch_str_param(&session->password_in, buf); |
a54a52ca | 3319 | case ISCSI_PARAM_TARGET_NAME: |
5700b1af | 3320 | return iscsi_switch_str_param(&session->targetname, buf); |
3c5c4801 VC |
3321 | case ISCSI_PARAM_TARGET_ALIAS: |
3322 | return iscsi_switch_str_param(&session->targetalias, buf); | |
a54a52ca MC |
3323 | case ISCSI_PARAM_TPGT: |
3324 | sscanf(buf, "%d", &session->tpgt); | |
3325 | break; | |
3326 | case ISCSI_PARAM_PERSISTENT_PORT: | |
3327 | sscanf(buf, "%d", &conn->persistent_port); | |
3328 | break; | |
3329 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
5700b1af | 3330 | return iscsi_switch_str_param(&conn->persistent_address, buf); |
88dfd340 | 3331 | case ISCSI_PARAM_IFACE_NAME: |
5700b1af | 3332 | return iscsi_switch_str_param(&session->ifacename, buf); |
88dfd340 | 3333 | case ISCSI_PARAM_INITIATOR_NAME: |
5700b1af | 3334 | return iscsi_switch_str_param(&session->initiatorname, buf); |
3b9373e9 EW |
3335 | case ISCSI_PARAM_BOOT_ROOT: |
3336 | return iscsi_switch_str_param(&session->boot_root, buf); | |
3337 | case ISCSI_PARAM_BOOT_NIC: | |
3338 | return iscsi_switch_str_param(&session->boot_nic, buf); | |
3339 | case ISCSI_PARAM_BOOT_TARGET: | |
3340 | return iscsi_switch_str_param(&session->boot_target, buf); | |
f8525eb4 AC |
3341 | case ISCSI_PARAM_PORTAL_TYPE: |
3342 | return iscsi_switch_str_param(&session->portal_type, buf); | |
3343 | case ISCSI_PARAM_DISCOVERY_PARENT_TYPE: | |
3344 | return iscsi_switch_str_param(&session->discovery_parent_type, | |
3345 | buf); | |
6a06a4b8 OG |
3346 | case ISCSI_PARAM_DISCOVERY_SESS: |
3347 | sscanf(buf, "%d", &val); | |
3348 | session->discovery_sess = !!val; | |
3349 | break; | |
ae56ff40 AC |
3350 | case ISCSI_PARAM_LOCAL_IPADDR: |
3351 | return iscsi_switch_str_param(&conn->local_ipaddr, buf); | |
a54a52ca MC |
3352 | default: |
3353 | return -ENOSYS; | |
3354 | } | |
3355 | ||
3356 | return 0; | |
3357 | } | |
3358 | EXPORT_SYMBOL_GPL(iscsi_set_param); | |
3359 | ||
3360 | int iscsi_session_get_param(struct iscsi_cls_session *cls_session, | |
3361 | enum iscsi_param param, char *buf) | |
3362 | { | |
75613521 | 3363 | struct iscsi_session *session = cls_session->dd_data; |
a54a52ca MC |
3364 | int len; |
3365 | ||
3366 | switch(param) { | |
843c0a8a MC |
3367 | case ISCSI_PARAM_FAST_ABORT: |
3368 | len = sprintf(buf, "%d\n", session->fast_abort); | |
3369 | break; | |
f6d5180c MC |
3370 | case ISCSI_PARAM_ABORT_TMO: |
3371 | len = sprintf(buf, "%d\n", session->abort_timeout); | |
3372 | break; | |
3373 | case ISCSI_PARAM_LU_RESET_TMO: | |
3374 | len = sprintf(buf, "%d\n", session->lu_reset_timeout); | |
3375 | break; | |
3fe5ae8b MC |
3376 | case ISCSI_PARAM_TGT_RESET_TMO: |
3377 | len = sprintf(buf, "%d\n", session->tgt_reset_timeout); | |
3378 | break; | |
a54a52ca MC |
3379 | case ISCSI_PARAM_INITIAL_R2T_EN: |
3380 | len = sprintf(buf, "%d\n", session->initial_r2t_en); | |
3381 | break; | |
3382 | case ISCSI_PARAM_MAX_R2T: | |
3383 | len = sprintf(buf, "%hu\n", session->max_r2t); | |
3384 | break; | |
3385 | case ISCSI_PARAM_IMM_DATA_EN: | |
3386 | len = sprintf(buf, "%d\n", session->imm_data_en); | |
3387 | break; | |
3388 | case ISCSI_PARAM_FIRST_BURST: | |
3389 | len = sprintf(buf, "%u\n", session->first_burst); | |
3390 | break; | |
3391 | case ISCSI_PARAM_MAX_BURST: | |
3392 | len = sprintf(buf, "%u\n", session->max_burst); | |
3393 | break; | |
3394 | case ISCSI_PARAM_PDU_INORDER_EN: | |
3395 | len = sprintf(buf, "%d\n", session->pdu_inorder_en); | |
3396 | break; | |
3397 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
3398 | len = sprintf(buf, "%d\n", session->dataseq_inorder_en); | |
3399 | break; | |
5f09e1f3 AC |
3400 | case ISCSI_PARAM_DEF_TASKMGMT_TMO: |
3401 | len = sprintf(buf, "%d\n", session->def_taskmgmt_tmo); | |
3402 | break; | |
a54a52ca MC |
3403 | case ISCSI_PARAM_ERL: |
3404 | len = sprintf(buf, "%d\n", session->erl); | |
3405 | break; | |
3406 | case ISCSI_PARAM_TARGET_NAME: | |
3407 | len = sprintf(buf, "%s\n", session->targetname); | |
3408 | break; | |
3c5c4801 VC |
3409 | case ISCSI_PARAM_TARGET_ALIAS: |
3410 | len = sprintf(buf, "%s\n", session->targetalias); | |
3411 | break; | |
a54a52ca MC |
3412 | case ISCSI_PARAM_TPGT: |
3413 | len = sprintf(buf, "%d\n", session->tpgt); | |
3414 | break; | |
b2c64167 MC |
3415 | case ISCSI_PARAM_USERNAME: |
3416 | len = sprintf(buf, "%s\n", session->username); | |
3417 | break; | |
3418 | case ISCSI_PARAM_USERNAME_IN: | |
3419 | len = sprintf(buf, "%s\n", session->username_in); | |
3420 | break; | |
3421 | case ISCSI_PARAM_PASSWORD: | |
3422 | len = sprintf(buf, "%s\n", session->password); | |
3423 | break; | |
3424 | case ISCSI_PARAM_PASSWORD_IN: | |
3425 | len = sprintf(buf, "%s\n", session->password_in); | |
3426 | break; | |
88dfd340 MC |
3427 | case ISCSI_PARAM_IFACE_NAME: |
3428 | len = sprintf(buf, "%s\n", session->ifacename); | |
3429 | break; | |
3430 | case ISCSI_PARAM_INITIATOR_NAME: | |
5700b1af | 3431 | len = sprintf(buf, "%s\n", session->initiatorname); |
88dfd340 | 3432 | break; |
3b9373e9 EW |
3433 | case ISCSI_PARAM_BOOT_ROOT: |
3434 | len = sprintf(buf, "%s\n", session->boot_root); | |
3435 | break; | |
3436 | case ISCSI_PARAM_BOOT_NIC: | |
3437 | len = sprintf(buf, "%s\n", session->boot_nic); | |
3438 | break; | |
3439 | case ISCSI_PARAM_BOOT_TARGET: | |
3440 | len = sprintf(buf, "%s\n", session->boot_target); | |
9a2307b1 | 3441 | break; |
f8525eb4 AC |
3442 | case ISCSI_PARAM_AUTO_SND_TGT_DISABLE: |
3443 | len = sprintf(buf, "%u\n", session->auto_snd_tgt_disable); | |
3444 | break; | |
3445 | case ISCSI_PARAM_DISCOVERY_SESS: | |
3446 | len = sprintf(buf, "%u\n", session->discovery_sess); | |
3447 | break; | |
3448 | case ISCSI_PARAM_PORTAL_TYPE: | |
3449 | len = sprintf(buf, "%s\n", session->portal_type); | |
3450 | break; | |
3451 | case ISCSI_PARAM_CHAP_AUTH_EN: | |
3452 | len = sprintf(buf, "%u\n", session->chap_auth_en); | |
3453 | break; | |
3454 | case ISCSI_PARAM_DISCOVERY_LOGOUT_EN: | |
3455 | len = sprintf(buf, "%u\n", session->discovery_logout_en); | |
3456 | break; | |
3457 | case ISCSI_PARAM_BIDI_CHAP_EN: | |
3458 | len = sprintf(buf, "%u\n", session->bidi_chap_en); | |
3459 | break; | |
3460 | case ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL: | |
3461 | len = sprintf(buf, "%u\n", session->discovery_auth_optional); | |
3462 | break; | |
3463 | case ISCSI_PARAM_DEF_TIME2WAIT: | |
3464 | len = sprintf(buf, "%d\n", session->time2wait); | |
3465 | break; | |
3466 | case ISCSI_PARAM_DEF_TIME2RETAIN: | |
3467 | len = sprintf(buf, "%d\n", session->time2retain); | |
3468 | break; | |
3469 | case ISCSI_PARAM_TSID: | |
3470 | len = sprintf(buf, "%u\n", session->tsid); | |
3471 | break; | |
3472 | case ISCSI_PARAM_ISID: | |
3473 | len = sprintf(buf, "%02x%02x%02x%02x%02x%02x\n", | |
3474 | session->isid[0], session->isid[1], | |
3475 | session->isid[2], session->isid[3], | |
3476 | session->isid[4], session->isid[5]); | |
3477 | break; | |
3478 | case ISCSI_PARAM_DISCOVERY_PARENT_IDX: | |
3479 | len = sprintf(buf, "%u\n", session->discovery_parent_idx); | |
3480 | break; | |
3481 | case ISCSI_PARAM_DISCOVERY_PARENT_TYPE: | |
3482 | if (session->discovery_parent_type) | |
3483 | len = sprintf(buf, "%s\n", | |
3484 | session->discovery_parent_type); | |
3485 | else | |
3486 | len = sprintf(buf, "\n"); | |
3b9373e9 | 3487 | break; |
a54a52ca MC |
3488 | default: |
3489 | return -ENOSYS; | |
3490 | } | |
3491 | ||
3492 | return len; | |
3493 | } | |
3494 | EXPORT_SYMBOL_GPL(iscsi_session_get_param); | |
3495 | ||
00f3708e MC |
3496 | int iscsi_conn_get_addr_param(struct sockaddr_storage *addr, |
3497 | enum iscsi_param param, char *buf) | |
3498 | { | |
3499 | struct sockaddr_in6 *sin6 = NULL; | |
3500 | struct sockaddr_in *sin = NULL; | |
3501 | int len; | |
3502 | ||
3503 | switch (addr->ss_family) { | |
3504 | case AF_INET: | |
3505 | sin = (struct sockaddr_in *)addr; | |
3506 | break; | |
3507 | case AF_INET6: | |
3508 | sin6 = (struct sockaddr_in6 *)addr; | |
3509 | break; | |
3510 | default: | |
3511 | return -EINVAL; | |
3512 | } | |
3513 | ||
3514 | switch (param) { | |
3515 | case ISCSI_PARAM_CONN_ADDRESS: | |
3516 | case ISCSI_HOST_PARAM_IPADDRESS: | |
3517 | if (sin) | |
3518 | len = sprintf(buf, "%pI4\n", &sin->sin_addr.s_addr); | |
3519 | else | |
3520 | len = sprintf(buf, "%pI6\n", &sin6->sin6_addr); | |
3521 | break; | |
3522 | case ISCSI_PARAM_CONN_PORT: | |
4bfb8ebf | 3523 | case ISCSI_PARAM_LOCAL_PORT: |
00f3708e MC |
3524 | if (sin) |
3525 | len = sprintf(buf, "%hu\n", be16_to_cpu(sin->sin_port)); | |
3526 | else | |
3527 | len = sprintf(buf, "%hu\n", | |
3528 | be16_to_cpu(sin6->sin6_port)); | |
3529 | break; | |
3530 | default: | |
3531 | return -EINVAL; | |
3532 | } | |
3533 | ||
3534 | return len; | |
3535 | } | |
3536 | EXPORT_SYMBOL_GPL(iscsi_conn_get_addr_param); | |
3537 | ||
a54a52ca MC |
3538 | int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn, |
3539 | enum iscsi_param param, char *buf) | |
3540 | { | |
3541 | struct iscsi_conn *conn = cls_conn->dd_data; | |
3542 | int len; | |
3543 | ||
3544 | switch(param) { | |
f6d5180c MC |
3545 | case ISCSI_PARAM_PING_TMO: |
3546 | len = sprintf(buf, "%u\n", conn->ping_timeout); | |
3547 | break; | |
3548 | case ISCSI_PARAM_RECV_TMO: | |
3549 | len = sprintf(buf, "%u\n", conn->recv_timeout); | |
3550 | break; | |
a54a52ca MC |
3551 | case ISCSI_PARAM_MAX_RECV_DLENGTH: |
3552 | len = sprintf(buf, "%u\n", conn->max_recv_dlength); | |
3553 | break; | |
3554 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
3555 | len = sprintf(buf, "%u\n", conn->max_xmit_dlength); | |
3556 | break; | |
3557 | case ISCSI_PARAM_HDRDGST_EN: | |
3558 | len = sprintf(buf, "%d\n", conn->hdrdgst_en); | |
3559 | break; | |
3560 | case ISCSI_PARAM_DATADGST_EN: | |
3561 | len = sprintf(buf, "%d\n", conn->datadgst_en); | |
3562 | break; | |
3563 | case ISCSI_PARAM_IFMARKER_EN: | |
3564 | len = sprintf(buf, "%d\n", conn->ifmarker_en); | |
3565 | break; | |
3566 | case ISCSI_PARAM_OFMARKER_EN: | |
3567 | len = sprintf(buf, "%d\n", conn->ofmarker_en); | |
3568 | break; | |
3569 | case ISCSI_PARAM_EXP_STATSN: | |
3570 | len = sprintf(buf, "%u\n", conn->exp_statsn); | |
3571 | break; | |
3572 | case ISCSI_PARAM_PERSISTENT_PORT: | |
3573 | len = sprintf(buf, "%d\n", conn->persistent_port); | |
3574 | break; | |
3575 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
3576 | len = sprintf(buf, "%s\n", conn->persistent_address); | |
3577 | break; | |
f8525eb4 AC |
3578 | case ISCSI_PARAM_STATSN: |
3579 | len = sprintf(buf, "%u\n", conn->statsn); | |
3580 | break; | |
3581 | case ISCSI_PARAM_MAX_SEGMENT_SIZE: | |
3582 | len = sprintf(buf, "%u\n", conn->max_segment_size); | |
3583 | break; | |
3584 | case ISCSI_PARAM_KEEPALIVE_TMO: | |
3585 | len = sprintf(buf, "%u\n", conn->keepalive_tmo); | |
3586 | break; | |
3587 | case ISCSI_PARAM_LOCAL_PORT: | |
3588 | len = sprintf(buf, "%u\n", conn->local_port); | |
3589 | break; | |
3590 | case ISCSI_PARAM_TCP_TIMESTAMP_STAT: | |
3591 | len = sprintf(buf, "%u\n", conn->tcp_timestamp_stat); | |
3592 | break; | |
3593 | case ISCSI_PARAM_TCP_NAGLE_DISABLE: | |
3594 | len = sprintf(buf, "%u\n", conn->tcp_nagle_disable); | |
3595 | break; | |
3596 | case ISCSI_PARAM_TCP_WSF_DISABLE: | |
3597 | len = sprintf(buf, "%u\n", conn->tcp_wsf_disable); | |
3598 | break; | |
3599 | case ISCSI_PARAM_TCP_TIMER_SCALE: | |
3600 | len = sprintf(buf, "%u\n", conn->tcp_timer_scale); | |
3601 | break; | |
3602 | case ISCSI_PARAM_TCP_TIMESTAMP_EN: | |
3603 | len = sprintf(buf, "%u\n", conn->tcp_timestamp_en); | |
3604 | break; | |
3605 | case ISCSI_PARAM_IP_FRAGMENT_DISABLE: | |
3606 | len = sprintf(buf, "%u\n", conn->fragment_disable); | |
3607 | break; | |
3608 | case ISCSI_PARAM_IPV4_TOS: | |
3609 | len = sprintf(buf, "%u\n", conn->ipv4_tos); | |
3610 | break; | |
3611 | case ISCSI_PARAM_IPV6_TC: | |
3612 | len = sprintf(buf, "%u\n", conn->ipv6_traffic_class); | |
3613 | break; | |
5f09e1f3 AC |
3614 | case ISCSI_PARAM_IPV6_FLOW_LABEL: |
3615 | len = sprintf(buf, "%u\n", conn->ipv6_flow_label); | |
3616 | break; | |
f8525eb4 AC |
3617 | case ISCSI_PARAM_IS_FW_ASSIGNED_IPV6: |
3618 | len = sprintf(buf, "%u\n", conn->is_fw_assigned_ipv6); | |
3619 | break; | |
3620 | case ISCSI_PARAM_TCP_XMIT_WSF: | |
3621 | len = sprintf(buf, "%u\n", conn->tcp_xmit_wsf); | |
3622 | break; | |
3623 | case ISCSI_PARAM_TCP_RECV_WSF: | |
3624 | len = sprintf(buf, "%u\n", conn->tcp_recv_wsf); | |
3625 | break; | |
ae56ff40 AC |
3626 | case ISCSI_PARAM_LOCAL_IPADDR: |
3627 | len = sprintf(buf, "%s\n", conn->local_ipaddr); | |
3628 | break; | |
a54a52ca MC |
3629 | default: |
3630 | return -ENOSYS; | |
3631 | } | |
3632 | ||
3633 | return len; | |
3634 | } | |
3635 | EXPORT_SYMBOL_GPL(iscsi_conn_get_param); | |
3636 | ||
0801c242 MC |
3637 | int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param, |
3638 | char *buf) | |
3639 | { | |
75613521 | 3640 | struct iscsi_host *ihost = shost_priv(shost); |
0801c242 MC |
3641 | int len; |
3642 | ||
3643 | switch (param) { | |
d8196ed2 | 3644 | case ISCSI_HOST_PARAM_NETDEV_NAME: |
5700b1af | 3645 | len = sprintf(buf, "%s\n", ihost->netdev); |
d8196ed2 | 3646 | break; |
0801c242 | 3647 | case ISCSI_HOST_PARAM_HWADDRESS: |
5700b1af | 3648 | len = sprintf(buf, "%s\n", ihost->hwaddress); |
0801c242 | 3649 | break; |
8ad5781a | 3650 | case ISCSI_HOST_PARAM_INITIATOR_NAME: |
5700b1af | 3651 | len = sprintf(buf, "%s\n", ihost->initiatorname); |
8ad5781a | 3652 | break; |
0801c242 MC |
3653 | default: |
3654 | return -ENOSYS; | |
3655 | } | |
3656 | ||
3657 | return len; | |
3658 | } | |
3659 | EXPORT_SYMBOL_GPL(iscsi_host_get_param); | |
3660 | ||
3661 | int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param, | |
3662 | char *buf, int buflen) | |
3663 | { | |
75613521 | 3664 | struct iscsi_host *ihost = shost_priv(shost); |
0801c242 MC |
3665 | |
3666 | switch (param) { | |
d8196ed2 | 3667 | case ISCSI_HOST_PARAM_NETDEV_NAME: |
5700b1af | 3668 | return iscsi_switch_str_param(&ihost->netdev, buf); |
0801c242 | 3669 | case ISCSI_HOST_PARAM_HWADDRESS: |
5700b1af | 3670 | return iscsi_switch_str_param(&ihost->hwaddress, buf); |
8ad5781a | 3671 | case ISCSI_HOST_PARAM_INITIATOR_NAME: |
5700b1af | 3672 | return iscsi_switch_str_param(&ihost->initiatorname, buf); |
0801c242 MC |
3673 | default: |
3674 | return -ENOSYS; | |
3675 | } | |
3676 | ||
3677 | return 0; | |
3678 | } | |
3679 | EXPORT_SYMBOL_GPL(iscsi_host_set_param); | |
3680 | ||
7996a778 MC |
3681 | MODULE_AUTHOR("Mike Christie"); |
3682 | MODULE_DESCRIPTION("iSCSI library functions"); | |
3683 | MODULE_LICENSE("GPL"); |