Commit | Line | Data |
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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
7996a778 MC |
2 | /* |
3 | * iSCSI lib functions | |
4 | * | |
5 | * Copyright (C) 2006 Red Hat, Inc. All rights reserved. | |
6 | * Copyright (C) 2004 - 2006 Mike Christie | |
7 | * Copyright (C) 2004 - 2005 Dmitry Yusupov | |
8 | * Copyright (C) 2004 - 2005 Alex Aizman | |
9 | * maintained by open-iscsi@googlegroups.com | |
7996a778 MC |
10 | */ |
11 | #include <linux/types.h> | |
7996a778 MC |
12 | #include <linux/kfifo.h> |
13 | #include <linux/delay.h> | |
11836572 | 14 | #include <linux/log2.h> |
5a0e3ad6 | 15 | #include <linux/slab.h> |
3f07c014 | 16 | #include <linux/sched/signal.h> |
acf3368f | 17 | #include <linux/module.h> |
8eb00539 | 18 | #include <asm/unaligned.h> |
7996a778 MC |
19 | #include <net/tcp.h> |
20 | #include <scsi/scsi_cmnd.h> | |
21 | #include <scsi/scsi_device.h> | |
22 | #include <scsi/scsi_eh.h> | |
23 | #include <scsi/scsi_tcq.h> | |
24 | #include <scsi/scsi_host.h> | |
25 | #include <scsi/scsi.h> | |
26 | #include <scsi/iscsi_proto.h> | |
27 | #include <scsi/scsi_transport.h> | |
28 | #include <scsi/scsi_transport_iscsi.h> | |
29 | #include <scsi/libiscsi.h> | |
c2332b00 | 30 | #include <trace/events/iscsi.h> |
7996a778 | 31 | |
bd2199d4 EZ |
32 | static int iscsi_dbg_lib_conn; |
33 | module_param_named(debug_libiscsi_conn, iscsi_dbg_lib_conn, int, | |
34 | S_IRUGO | S_IWUSR); | |
35 | MODULE_PARM_DESC(debug_libiscsi_conn, | |
36 | "Turn on debugging for connections in libiscsi module. " | |
37 | "Set to 1 to turn on, and zero to turn off. Default is off."); | |
38 | ||
39 | static int iscsi_dbg_lib_session; | |
40 | module_param_named(debug_libiscsi_session, iscsi_dbg_lib_session, int, | |
41 | S_IRUGO | S_IWUSR); | |
42 | MODULE_PARM_DESC(debug_libiscsi_session, | |
43 | "Turn on debugging for sessions in libiscsi module. " | |
44 | "Set to 1 to turn on, and zero to turn off. Default is off."); | |
45 | ||
46 | static int iscsi_dbg_lib_eh; | |
47 | module_param_named(debug_libiscsi_eh, iscsi_dbg_lib_eh, int, | |
48 | S_IRUGO | S_IWUSR); | |
49 | MODULE_PARM_DESC(debug_libiscsi_eh, | |
50 | "Turn on debugging for error handling in libiscsi module. " | |
51 | "Set to 1 to turn on, and zero to turn off. Default is off."); | |
1b2c7af8 MC |
52 | |
53 | #define ISCSI_DBG_CONN(_conn, dbg_fmt, arg...) \ | |
54 | do { \ | |
bd2199d4 | 55 | if (iscsi_dbg_lib_conn) \ |
1b2c7af8 MC |
56 | iscsi_conn_printk(KERN_INFO, _conn, \ |
57 | "%s " dbg_fmt, \ | |
58 | __func__, ##arg); \ | |
c2332b00 FH |
59 | iscsi_dbg_trace(trace_iscsi_dbg_conn, \ |
60 | &(_conn)->cls_conn->dev, \ | |
61 | "%s " dbg_fmt, __func__, ##arg);\ | |
1b2c7af8 MC |
62 | } while (0); |
63 | ||
64 | #define ISCSI_DBG_SESSION(_session, dbg_fmt, arg...) \ | |
65 | do { \ | |
bd2199d4 EZ |
66 | if (iscsi_dbg_lib_session) \ |
67 | iscsi_session_printk(KERN_INFO, _session, \ | |
68 | "%s " dbg_fmt, \ | |
69 | __func__, ##arg); \ | |
c2332b00 FH |
70 | iscsi_dbg_trace(trace_iscsi_dbg_session, \ |
71 | &(_session)->cls_session->dev, \ | |
72 | "%s " dbg_fmt, __func__, ##arg); \ | |
bd2199d4 EZ |
73 | } while (0); |
74 | ||
75 | #define ISCSI_DBG_EH(_session, dbg_fmt, arg...) \ | |
76 | do { \ | |
77 | if (iscsi_dbg_lib_eh) \ | |
1b2c7af8 MC |
78 | iscsi_session_printk(KERN_INFO, _session, \ |
79 | "%s " dbg_fmt, \ | |
80 | __func__, ##arg); \ | |
c2332b00 FH |
81 | iscsi_dbg_trace(trace_iscsi_dbg_eh, \ |
82 | &(_session)->cls_session->dev, \ | |
83 | "%s " dbg_fmt, __func__, ##arg); \ | |
1b2c7af8 MC |
84 | } while (0); |
85 | ||
e1c6a7ec MC |
86 | #define ISCSI_CMD_COMPL_WAIT 5 |
87 | ||
4b9f8ce4 | 88 | inline void iscsi_conn_queue_xmit(struct iscsi_conn *conn) |
32ae763e MC |
89 | { |
90 | struct Scsi_Host *shost = conn->session->host; | |
91 | struct iscsi_host *ihost = shost_priv(shost); | |
92 | ||
1336aed1 MC |
93 | if (ihost->workq) |
94 | queue_work(ihost->workq, &conn->xmitwork); | |
32ae763e | 95 | } |
4b9f8ce4 | 96 | EXPORT_SYMBOL_GPL(iscsi_conn_queue_xmit); |
32ae763e | 97 | |
8af80996 MC |
98 | inline void iscsi_conn_queue_recv(struct iscsi_conn *conn) |
99 | { | |
100 | struct Scsi_Host *shost = conn->session->host; | |
101 | struct iscsi_host *ihost = shost_priv(shost); | |
102 | ||
103 | if (ihost->workq && !test_bit(ISCSI_CONN_FLAG_SUSPEND_RX, &conn->flags)) | |
104 | queue_work(ihost->workq, &conn->recvwork); | |
105 | } | |
106 | EXPORT_SYMBOL_GPL(iscsi_conn_queue_recv); | |
107 | ||
4c0ba5d2 MC |
108 | static void __iscsi_update_cmdsn(struct iscsi_session *session, |
109 | uint32_t exp_cmdsn, uint32_t max_cmdsn) | |
7996a778 | 110 | { |
77a23c21 MC |
111 | /* |
112 | * standard specifies this check for when to update expected and | |
113 | * max sequence numbers | |
114 | */ | |
115 | if (iscsi_sna_lt(max_cmdsn, exp_cmdsn - 1)) | |
116 | return; | |
117 | ||
118 | if (exp_cmdsn != session->exp_cmdsn && | |
119 | !iscsi_sna_lt(exp_cmdsn, session->exp_cmdsn)) | |
7996a778 MC |
120 | session->exp_cmdsn = exp_cmdsn; |
121 | ||
77a23c21 | 122 | if (max_cmdsn != session->max_cmdsn && |
46a84c65 | 123 | !iscsi_sna_lt(max_cmdsn, session->max_cmdsn)) |
77a23c21 | 124 | session->max_cmdsn = max_cmdsn; |
7996a778 | 125 | } |
4c0ba5d2 MC |
126 | |
127 | void iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr) | |
128 | { | |
129 | __iscsi_update_cmdsn(session, be32_to_cpu(hdr->exp_cmdsn), | |
130 | be32_to_cpu(hdr->max_cmdsn)); | |
131 | } | |
77a23c21 | 132 | EXPORT_SYMBOL_GPL(iscsi_update_cmdsn); |
7996a778 | 133 | |
577577da MC |
134 | /** |
135 | * iscsi_prep_data_out_pdu - initialize Data-Out | |
136 | * @task: scsi command task | |
137 | * @r2t: R2T info | |
138 | * @hdr: iscsi data in pdu | |
139 | * | |
140 | * Notes: | |
141 | * Initialize Data-Out within this R2T sequence and finds | |
142 | * proper data_offset within this SCSI command. | |
143 | * | |
144 | * This function is called with connection lock taken. | |
145 | **/ | |
146 | void iscsi_prep_data_out_pdu(struct iscsi_task *task, struct iscsi_r2t_info *r2t, | |
147 | struct iscsi_data *hdr) | |
7996a778 | 148 | { |
9c19a7d0 | 149 | struct iscsi_conn *conn = task->conn; |
577577da MC |
150 | unsigned int left = r2t->data_length - r2t->sent; |
151 | ||
152 | task->hdr_len = sizeof(struct iscsi_data); | |
7996a778 MC |
153 | |
154 | memset(hdr, 0, sizeof(struct iscsi_data)); | |
577577da MC |
155 | hdr->ttt = r2t->ttt; |
156 | hdr->datasn = cpu_to_be32(r2t->datasn); | |
157 | r2t->datasn++; | |
7996a778 | 158 | hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; |
55bdabdf | 159 | hdr->lun = task->lun; |
577577da MC |
160 | hdr->itt = task->hdr_itt; |
161 | hdr->exp_statsn = r2t->exp_statsn; | |
162 | hdr->offset = cpu_to_be32(r2t->data_offset + r2t->sent); | |
163 | if (left > conn->max_xmit_dlength) { | |
7996a778 | 164 | hton24(hdr->dlength, conn->max_xmit_dlength); |
577577da | 165 | r2t->data_count = conn->max_xmit_dlength; |
7996a778 MC |
166 | hdr->flags = 0; |
167 | } else { | |
577577da MC |
168 | hton24(hdr->dlength, left); |
169 | r2t->data_count = left; | |
7996a778 MC |
170 | hdr->flags = ISCSI_FLAG_CMD_FINAL; |
171 | } | |
577577da | 172 | conn->dataout_pdus_cnt++; |
7996a778 | 173 | } |
577577da | 174 | EXPORT_SYMBOL_GPL(iscsi_prep_data_out_pdu); |
7996a778 | 175 | |
9c19a7d0 | 176 | static int iscsi_add_hdr(struct iscsi_task *task, unsigned len) |
004d6530 | 177 | { |
9c19a7d0 | 178 | unsigned exp_len = task->hdr_len + len; |
004d6530 | 179 | |
9c19a7d0 | 180 | if (exp_len > task->hdr_max) { |
004d6530 BH |
181 | WARN_ON(1); |
182 | return -EINVAL; | |
183 | } | |
184 | ||
185 | WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */ | |
9c19a7d0 | 186 | task->hdr_len = exp_len; |
004d6530 BH |
187 | return 0; |
188 | } | |
189 | ||
38d1c069 BH |
190 | /* |
191 | * make an extended cdb AHS | |
192 | */ | |
9c19a7d0 | 193 | static int iscsi_prep_ecdb_ahs(struct iscsi_task *task) |
38d1c069 | 194 | { |
9c19a7d0 | 195 | struct scsi_cmnd *cmd = task->sc; |
38d1c069 BH |
196 | unsigned rlen, pad_len; |
197 | unsigned short ahslength; | |
198 | struct iscsi_ecdb_ahdr *ecdb_ahdr; | |
199 | int rc; | |
200 | ||
9c19a7d0 | 201 | ecdb_ahdr = iscsi_next_hdr(task); |
38d1c069 BH |
202 | rlen = cmd->cmd_len - ISCSI_CDB_SIZE; |
203 | ||
204 | BUG_ON(rlen > sizeof(ecdb_ahdr->ecdb)); | |
205 | ahslength = rlen + sizeof(ecdb_ahdr->reserved); | |
206 | ||
207 | pad_len = iscsi_padding(rlen); | |
208 | ||
9c19a7d0 | 209 | rc = iscsi_add_hdr(task, sizeof(ecdb_ahdr->ahslength) + |
38d1c069 BH |
210 | sizeof(ecdb_ahdr->ahstype) + ahslength + pad_len); |
211 | if (rc) | |
212 | return rc; | |
213 | ||
214 | if (pad_len) | |
215 | memset(&ecdb_ahdr->ecdb[rlen], 0, pad_len); | |
216 | ||
217 | ecdb_ahdr->ahslength = cpu_to_be16(ahslength); | |
218 | ecdb_ahdr->ahstype = ISCSI_AHSTYPE_CDB; | |
219 | ecdb_ahdr->reserved = 0; | |
220 | memcpy(ecdb_ahdr->ecdb, cmd->cmnd + ISCSI_CDB_SIZE, rlen); | |
221 | ||
1b2c7af8 MC |
222 | ISCSI_DBG_SESSION(task->conn->session, |
223 | "iscsi_prep_ecdb_ahs: varlen_cdb_len %d " | |
224 | "rlen %d pad_len %d ahs_length %d iscsi_headers_size " | |
225 | "%u\n", cmd->cmd_len, rlen, pad_len, ahslength, | |
226 | task->hdr_len); | |
38d1c069 BH |
227 | return 0; |
228 | } | |
229 | ||
5d12c05e MC |
230 | /** |
231 | * iscsi_check_tmf_restrictions - check if a task is affected by TMF | |
232 | * @task: iscsi task | |
233 | * @opcode: opcode to check for | |
234 | * | |
235 | * During TMF a task has to be checked if it's affected. | |
236 | * All unrelated I/O can be passed through, but I/O to the | |
237 | * affected LUN should be restricted. | |
238 | * If 'fast_abort' is set we won't be sending any I/O to the | |
239 | * affected LUN. | |
240 | * Otherwise the target is waiting for all TTTs to be completed, | |
241 | * so we have to send all outstanding Data-Out PDUs to the target. | |
242 | */ | |
243 | static int iscsi_check_tmf_restrictions(struct iscsi_task *task, int opcode) | |
244 | { | |
ec29d0ac MC |
245 | struct iscsi_session *session = task->conn->session; |
246 | struct iscsi_tm *tmf = &session->tmhdr; | |
9cb78c16 | 247 | u64 hdr_lun; |
5d12c05e | 248 | |
ec29d0ac | 249 | if (session->tmf_state == TMF_INITIAL) |
5d12c05e MC |
250 | return 0; |
251 | ||
252 | if ((tmf->opcode & ISCSI_OPCODE_MASK) != ISCSI_OP_SCSI_TMFUNC) | |
253 | return 0; | |
254 | ||
255 | switch (ISCSI_TM_FUNC_VALUE(tmf)) { | |
256 | case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: | |
257 | /* | |
258 | * Allow PDUs for unrelated LUNs | |
259 | */ | |
55bdabdf | 260 | hdr_lun = scsilun_to_int(&tmf->lun); |
5d12c05e MC |
261 | if (hdr_lun != task->sc->device->lun) |
262 | return 0; | |
df561f66 | 263 | fallthrough; |
3fe5ae8b | 264 | case ISCSI_TM_FUNC_TARGET_WARM_RESET: |
5d12c05e MC |
265 | /* |
266 | * Fail all SCSI cmd PDUs | |
267 | */ | |
268 | if (opcode != ISCSI_OP_SCSI_DATA_OUT) { | |
ec29d0ac MC |
269 | iscsi_session_printk(KERN_INFO, session, |
270 | "task [op %x itt 0x%x/0x%x] rejected.\n", | |
271 | opcode, task->itt, task->hdr_itt); | |
5d12c05e MC |
272 | return -EACCES; |
273 | } | |
274 | /* | |
275 | * And also all data-out PDUs in response to R2T | |
276 | * if fast_abort is set. | |
277 | */ | |
ec29d0ac MC |
278 | if (session->fast_abort) { |
279 | iscsi_session_printk(KERN_INFO, session, | |
280 | "task [op %x itt 0x%x/0x%x] fast abort.\n", | |
281 | opcode, task->itt, task->hdr_itt); | |
5d12c05e MC |
282 | return -EACCES; |
283 | } | |
284 | break; | |
285 | case ISCSI_TM_FUNC_ABORT_TASK: | |
286 | /* | |
287 | * the caller has already checked if the task | |
288 | * they want to abort was in the pending queue so if | |
289 | * we are here the cmd pdu has gone out already, and | |
290 | * we will only hit this for data-outs | |
291 | */ | |
292 | if (opcode == ISCSI_OP_SCSI_DATA_OUT && | |
293 | task->hdr_itt == tmf->rtt) { | |
ec29d0ac | 294 | ISCSI_DBG_SESSION(session, |
5d12c05e MC |
295 | "Preventing task %x/%x from sending " |
296 | "data-out due to abort task in " | |
297 | "progress\n", task->itt, | |
298 | task->hdr_itt); | |
299 | return -EACCES; | |
300 | } | |
301 | break; | |
302 | } | |
303 | ||
304 | return 0; | |
305 | } | |
306 | ||
7996a778 MC |
307 | /** |
308 | * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu | |
9c19a7d0 | 309 | * @task: iscsi task |
7996a778 MC |
310 | * |
311 | * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set | |
312 | * fields like dlength or final based on how much data it sends | |
313 | */ | |
9c19a7d0 | 314 | static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task) |
7996a778 | 315 | { |
9c19a7d0 | 316 | struct iscsi_conn *conn = task->conn; |
7996a778 | 317 | struct iscsi_session *session = conn->session; |
9c19a7d0 | 318 | struct scsi_cmnd *sc = task->sc; |
12352183 | 319 | struct iscsi_scsi_req *hdr; |
d77e6535 | 320 | unsigned hdrlength, cmd_len, transfer_length; |
262ef636 | 321 | itt_t itt; |
004d6530 | 322 | int rc; |
7996a778 | 323 | |
5d12c05e MC |
324 | rc = iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_CMD); |
325 | if (rc) | |
326 | return rc; | |
327 | ||
184b57c6 MC |
328 | if (conn->session->tt->alloc_pdu) { |
329 | rc = conn->session->tt->alloc_pdu(task, ISCSI_OP_SCSI_CMD); | |
330 | if (rc) | |
331 | return rc; | |
332 | } | |
12352183 | 333 | hdr = (struct iscsi_scsi_req *)task->hdr; |
262ef636 | 334 | itt = hdr->itt; |
577577da MC |
335 | memset(hdr, 0, sizeof(*hdr)); |
336 | ||
2ff79d52 MC |
337 | if (session->tt->parse_pdu_itt) |
338 | hdr->itt = task->hdr_itt = itt; | |
339 | else | |
340 | hdr->itt = task->hdr_itt = build_itt(task->itt, | |
341 | task->conn->session->age); | |
9c19a7d0 MC |
342 | task->hdr_len = 0; |
343 | rc = iscsi_add_hdr(task, sizeof(*hdr)); | |
004d6530 BH |
344 | if (rc) |
345 | return rc; | |
a8ac6311 OK |
346 | hdr->opcode = ISCSI_OP_SCSI_CMD; |
347 | hdr->flags = ISCSI_ATTR_SIMPLE; | |
55bdabdf AG |
348 | int_to_scsilun(sc->device->lun, &hdr->lun); |
349 | task->lun = hdr->lun; | |
a8ac6311 | 350 | hdr->exp_statsn = cpu_to_be32(conn->exp_statsn); |
38d1c069 BH |
351 | cmd_len = sc->cmd_len; |
352 | if (cmd_len < ISCSI_CDB_SIZE) | |
353 | memset(&hdr->cdb[cmd_len], 0, ISCSI_CDB_SIZE - cmd_len); | |
354 | else if (cmd_len > ISCSI_CDB_SIZE) { | |
9c19a7d0 | 355 | rc = iscsi_prep_ecdb_ahs(task); |
38d1c069 BH |
356 | if (rc) |
357 | return rc; | |
358 | cmd_len = ISCSI_CDB_SIZE; | |
359 | } | |
360 | memcpy(hdr->cdb, sc->cmnd, cmd_len); | |
7996a778 | 361 | |
9c19a7d0 | 362 | task->imm_count = 0; |
55e51eda SG |
363 | if (scsi_get_prot_op(sc) != SCSI_PROT_NORMAL) |
364 | task->protected = true; | |
365 | ||
d77e6535 SG |
366 | transfer_length = scsi_transfer_length(sc); |
367 | hdr->data_length = cpu_to_be32(transfer_length); | |
7996a778 | 368 | if (sc->sc_data_direction == DMA_TO_DEVICE) { |
577577da MC |
369 | struct iscsi_r2t_info *r2t = &task->unsol_r2t; |
370 | ||
7996a778 MC |
371 | hdr->flags |= ISCSI_FLAG_CMD_WRITE; |
372 | /* | |
373 | * Write counters: | |
374 | * | |
375 | * imm_count bytes to be sent right after | |
376 | * SCSI PDU Header | |
377 | * | |
378 | * unsol_count bytes(as Data-Out) to be sent | |
379 | * without R2T ack right after | |
380 | * immediate data | |
381 | * | |
577577da | 382 | * r2t data_length bytes to be sent via R2T ack's |
7996a778 MC |
383 | * |
384 | * pad_count bytes to be sent as zero-padding | |
385 | */ | |
577577da | 386 | memset(r2t, 0, sizeof(*r2t)); |
7996a778 MC |
387 | |
388 | if (session->imm_data_en) { | |
d77e6535 | 389 | if (transfer_length >= session->first_burst) |
9c19a7d0 | 390 | task->imm_count = min(session->first_burst, |
7996a778 MC |
391 | conn->max_xmit_dlength); |
392 | else | |
d77e6535 SG |
393 | task->imm_count = min(transfer_length, |
394 | conn->max_xmit_dlength); | |
9c19a7d0 | 395 | hton24(hdr->dlength, task->imm_count); |
7996a778 | 396 | } else |
a8ac6311 | 397 | zero_data(hdr->dlength); |
7996a778 | 398 | |
ffd0436e | 399 | if (!session->initial_r2t_en) { |
d77e6535 SG |
400 | r2t->data_length = min(session->first_burst, |
401 | transfer_length) - | |
577577da MC |
402 | task->imm_count; |
403 | r2t->data_offset = task->imm_count; | |
404 | r2t->ttt = cpu_to_be32(ISCSI_RESERVED_TAG); | |
405 | r2t->exp_statsn = cpu_to_be32(conn->exp_statsn); | |
ffd0436e MC |
406 | } |
407 | ||
577577da | 408 | if (!task->unsol_r2t.data_length) |
7996a778 | 409 | /* No unsolicit Data-Out's */ |
a8ac6311 | 410 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; |
7996a778 | 411 | } else { |
7996a778 MC |
412 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; |
413 | zero_data(hdr->dlength); | |
414 | ||
415 | if (sc->sc_data_direction == DMA_FROM_DEVICE) | |
416 | hdr->flags |= ISCSI_FLAG_CMD_READ; | |
417 | } | |
418 | ||
004d6530 | 419 | /* calculate size of additional header segments (AHSs) */ |
9c19a7d0 | 420 | hdrlength = task->hdr_len - sizeof(*hdr); |
004d6530 BH |
421 | |
422 | WARN_ON(hdrlength & (ISCSI_PAD_LEN-1)); | |
423 | hdrlength /= ISCSI_PAD_LEN; | |
424 | ||
425 | WARN_ON(hdrlength >= 256); | |
426 | hdr->hlength = hdrlength & 0xFF; | |
96b1f96d | 427 | hdr->cmdsn = task->cmdsn = cpu_to_be32(session->cmdsn); |
004d6530 | 428 | |
577577da | 429 | if (session->tt->init_task && session->tt->init_task(task)) |
052d0144 MC |
430 | return -EIO; |
431 | ||
9c19a7d0 | 432 | task->state = ISCSI_TASK_RUNNING; |
d3305f34 | 433 | session->cmdsn++; |
77a23c21 | 434 | |
a8ac6311 | 435 | conn->scsicmd_pdus_cnt++; |
1b2c7af8 | 436 | ISCSI_DBG_SESSION(session, "iscsi prep [%s cid %d sc %p cdb 0x%x " |
ae3d56d8 | 437 | "itt 0x%x len %d cmdsn %d win %d]\n", |
1b2c7af8 MC |
438 | sc->sc_data_direction == DMA_TO_DEVICE ? |
439 | "write" : "read", conn->id, sc, sc->cmnd[0], | |
d77e6535 | 440 | task->itt, transfer_length, |
1b2c7af8 MC |
441 | session->cmdsn, |
442 | session->max_cmdsn - session->exp_cmdsn + 1); | |
004d6530 | 443 | return 0; |
7996a778 | 444 | } |
7996a778 MC |
445 | |
446 | /** | |
3bbaaad9 | 447 | * iscsi_free_task - free a task |
9c19a7d0 | 448 | * @task: iscsi cmd task |
7996a778 | 449 | * |
659743b0 | 450 | * Must be called with session back_lock. |
3e5c28ad MC |
451 | * This function returns the scsi command to scsi-ml or cleans |
452 | * up mgmt tasks then returns the task to the pool. | |
7996a778 | 453 | */ |
3bbaaad9 | 454 | static void iscsi_free_task(struct iscsi_task *task) |
7996a778 | 455 | { |
9c19a7d0 | 456 | struct iscsi_conn *conn = task->conn; |
c1635cb7 | 457 | struct iscsi_session *session = conn->session; |
9c19a7d0 | 458 | struct scsi_cmnd *sc = task->sc; |
f41d4721 | 459 | int oldstate = task->state; |
7996a778 | 460 | |
4421c9eb MC |
461 | ISCSI_DBG_SESSION(session, "freeing task itt 0x%x state %d sc %p\n", |
462 | task->itt, task->state, task->sc); | |
463 | ||
577577da | 464 | session->tt->cleanup_task(task); |
3bbaaad9 | 465 | task->state = ISCSI_TASK_FREE; |
9c19a7d0 | 466 | task->sc = NULL; |
3e5c28ad | 467 | /* |
9c19a7d0 | 468 | * login task is preallocated so do not free |
3e5c28ad | 469 | */ |
9c19a7d0 | 470 | if (conn->login_task == task) |
3e5c28ad MC |
471 | return; |
472 | ||
7acd72eb | 473 | kfifo_in(&session->cmdpool.queue, (void*)&task, sizeof(void*)); |
052d0144 | 474 | |
3e5c28ad | 475 | if (sc) { |
3e5c28ad | 476 | /* SCSI eh reuses commands to verify us */ |
db22de3e | 477 | iscsi_cmd(sc)->task = NULL; |
3e5c28ad | 478 | /* |
f41d4721 MC |
479 | * queue command may call this to free the task, so |
480 | * it will decide how to return sc to scsi-ml. | |
3e5c28ad | 481 | */ |
f41d4721 | 482 | if (oldstate != ISCSI_TASK_REQUEUE_SCSIQ) |
b4b84edc | 483 | scsi_done(sc); |
3e5c28ad | 484 | } |
7996a778 MC |
485 | } |
486 | ||
e1c6a7ec | 487 | bool iscsi_get_task(struct iscsi_task *task) |
60ecebf5 | 488 | { |
e1c6a7ec | 489 | return refcount_inc_not_zero(&task->refcount); |
60ecebf5 | 490 | } |
e1c6a7ec | 491 | EXPORT_SYMBOL_GPL(iscsi_get_task); |
60ecebf5 | 492 | |
6d626150 MC |
493 | /** |
494 | * __iscsi_put_task - drop the refcount on a task | |
495 | * @task: iscsi_task to drop the refcount on | |
496 | * | |
497 | * The back_lock must be held when calling in case it frees the task. | |
498 | */ | |
8eea2f55 | 499 | void __iscsi_put_task(struct iscsi_task *task) |
60ecebf5 | 500 | { |
6dc618cd | 501 | if (refcount_dec_and_test(&task->refcount)) |
3bbaaad9 | 502 | iscsi_free_task(task); |
60ecebf5 | 503 | } |
8eea2f55 | 504 | EXPORT_SYMBOL_GPL(__iscsi_put_task); |
60ecebf5 | 505 | |
9c19a7d0 | 506 | void iscsi_put_task(struct iscsi_task *task) |
3e5c28ad | 507 | { |
9c19a7d0 | 508 | struct iscsi_session *session = task->conn->session; |
3e5c28ad | 509 | |
6d626150 MC |
510 | if (refcount_dec_and_test(&task->refcount)) { |
511 | spin_lock_bh(&session->back_lock); | |
512 | iscsi_free_task(task); | |
513 | spin_unlock_bh(&session->back_lock); | |
514 | } | |
3e5c28ad | 515 | } |
9c19a7d0 | 516 | EXPORT_SYMBOL_GPL(iscsi_put_task); |
3e5c28ad | 517 | |
3bbaaad9 MC |
518 | /** |
519 | * iscsi_complete_task - finish a task | |
520 | * @task: iscsi cmd task | |
b3cd5050 | 521 | * @state: state to complete task with |
3bbaaad9 | 522 | * |
659743b0 | 523 | * Must be called with session back_lock. |
3bbaaad9 | 524 | */ |
b3cd5050 | 525 | static void iscsi_complete_task(struct iscsi_task *task, int state) |
3bbaaad9 MC |
526 | { |
527 | struct iscsi_conn *conn = task->conn; | |
528 | ||
4421c9eb MC |
529 | ISCSI_DBG_SESSION(conn->session, |
530 | "complete task itt 0x%x state %d sc %p\n", | |
531 | task->itt, task->state, task->sc); | |
b3cd5050 MC |
532 | if (task->state == ISCSI_TASK_COMPLETED || |
533 | task->state == ISCSI_TASK_ABRT_TMF || | |
f41d4721 MC |
534 | task->state == ISCSI_TASK_ABRT_SESS_RECOV || |
535 | task->state == ISCSI_TASK_REQUEUE_SCSIQ) | |
3bbaaad9 MC |
536 | return; |
537 | WARN_ON_ONCE(task->state == ISCSI_TASK_FREE); | |
b3cd5050 | 538 | task->state = state; |
3bbaaad9 | 539 | |
fe0a8a95 LD |
540 | if (READ_ONCE(conn->ping_task) == task) |
541 | WRITE_ONCE(conn->ping_task, NULL); | |
3bbaaad9 MC |
542 | |
543 | /* release get from queueing */ | |
544 | __iscsi_put_task(task); | |
545 | } | |
546 | ||
4c0ba5d2 MC |
547 | /** |
548 | * iscsi_complete_scsi_task - finish scsi task normally | |
549 | * @task: iscsi task for scsi cmd | |
550 | * @exp_cmdsn: expected cmd sn in cpu format | |
551 | * @max_cmdsn: max cmd sn in cpu format | |
552 | * | |
553 | * This is used when drivers do not need or cannot perform | |
554 | * lower level pdu processing. | |
555 | * | |
659743b0 | 556 | * Called with session back_lock |
4c0ba5d2 MC |
557 | */ |
558 | void iscsi_complete_scsi_task(struct iscsi_task *task, | |
559 | uint32_t exp_cmdsn, uint32_t max_cmdsn) | |
560 | { | |
561 | struct iscsi_conn *conn = task->conn; | |
562 | ||
563 | ISCSI_DBG_SESSION(conn->session, "[itt 0x%x]\n", task->itt); | |
564 | ||
565 | conn->last_recv = jiffies; | |
566 | __iscsi_update_cmdsn(conn->session, exp_cmdsn, max_cmdsn); | |
567 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); | |
568 | } | |
569 | EXPORT_SYMBOL_GPL(iscsi_complete_scsi_task); | |
570 | ||
5923d64b MC |
571 | /* |
572 | * Must be called with back and frwd lock | |
573 | */ | |
574 | static bool cleanup_queued_task(struct iscsi_task *task) | |
575 | { | |
576 | struct iscsi_conn *conn = task->conn; | |
577 | bool early_complete = false; | |
578 | ||
533ac412 MC |
579 | /* |
580 | * We might have raced where we handled a R2T early and got a response | |
581 | * but have not yet taken the task off the requeue list, then a TMF or | |
582 | * recovery happened and so we can still see it here. | |
583 | */ | |
5923d64b MC |
584 | if (task->state == ISCSI_TASK_COMPLETED) |
585 | early_complete = true; | |
586 | ||
587 | if (!list_empty(&task->running)) { | |
588 | list_del_init(&task->running); | |
589 | /* | |
533ac412 MC |
590 | * If it's on a list but still running this could be cleanup |
591 | * from a TMF or session recovery. | |
5923d64b MC |
592 | */ |
593 | if (task->state == ISCSI_TASK_RUNNING || | |
594 | task->state == ISCSI_TASK_COMPLETED) | |
595 | __iscsi_put_task(task); | |
596 | } | |
597 | ||
99b06033 MC |
598 | if (conn->session->running_aborted_task == task) { |
599 | conn->session->running_aborted_task = NULL; | |
600 | __iscsi_put_task(task); | |
601 | } | |
602 | ||
5923d64b MC |
603 | if (conn->task == task) { |
604 | conn->task = NULL; | |
605 | __iscsi_put_task(task); | |
606 | } | |
607 | ||
608 | return early_complete; | |
609 | } | |
4c0ba5d2 | 610 | |
b3a7ea8d | 611 | /* |
e1c6a7ec MC |
612 | * session back and frwd lock must be held and if not called for a task that |
613 | * is still pending or from the xmit thread, then xmit thread must be suspended | |
b3a7ea8d | 614 | */ |
e1c6a7ec | 615 | static void __fail_scsi_task(struct iscsi_task *task, int err) |
b3a7ea8d | 616 | { |
3bbaaad9 | 617 | struct iscsi_conn *conn = task->conn; |
b3a7ea8d | 618 | struct scsi_cmnd *sc; |
b3cd5050 | 619 | int state; |
b3a7ea8d | 620 | |
e1c6a7ec | 621 | if (cleanup_queued_task(task)) |
5923d64b | 622 | return; |
5923d64b | 623 | |
b3cd5050 | 624 | if (task->state == ISCSI_TASK_PENDING) { |
b3a7ea8d MC |
625 | /* |
626 | * cmd never made it to the xmit thread, so we should not count | |
627 | * the cmd in the sequencing | |
628 | */ | |
629 | conn->session->queued_cmdsn--; | |
b3cd5050 MC |
630 | /* it was never sent so just complete like normal */ |
631 | state = ISCSI_TASK_COMPLETED; | |
632 | } else if (err == DID_TRANSPORT_DISRUPTED) | |
633 | state = ISCSI_TASK_ABRT_SESS_RECOV; | |
634 | else | |
635 | state = ISCSI_TASK_ABRT_TMF; | |
b3a7ea8d | 636 | |
14936b1e | 637 | sc = task->sc; |
b3cd5050 | 638 | sc->result = err << 16; |
ae3d56d8 | 639 | scsi_set_resid(sc, scsi_bufflen(sc)); |
b3cd5050 | 640 | iscsi_complete_task(task, state); |
e1c6a7ec MC |
641 | } |
642 | ||
643 | static void fail_scsi_task(struct iscsi_task *task, int err) | |
644 | { | |
645 | struct iscsi_session *session = task->conn->session; | |
646 | ||
647 | spin_lock_bh(&session->back_lock); | |
648 | __fail_scsi_task(task, err); | |
649 | spin_unlock_bh(&session->back_lock); | |
b3a7ea8d MC |
650 | } |
651 | ||
3e5c28ad | 652 | static int iscsi_prep_mgmt_task(struct iscsi_conn *conn, |
9c19a7d0 | 653 | struct iscsi_task *task) |
052d0144 MC |
654 | { |
655 | struct iscsi_session *session = conn->session; | |
577577da | 656 | struct iscsi_hdr *hdr = task->hdr; |
052d0144 | 657 | struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr; |
4f704dc0 | 658 | uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK; |
052d0144 MC |
659 | |
660 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) | |
661 | return -ENOTCONN; | |
662 | ||
4f704dc0 | 663 | if (opcode != ISCSI_OP_LOGIN && opcode != ISCSI_OP_TEXT) |
052d0144 MC |
664 | nop->exp_statsn = cpu_to_be32(conn->exp_statsn); |
665 | /* | |
666 | * pre-format CmdSN for outgoing PDU. | |
667 | */ | |
668 | nop->cmdsn = cpu_to_be32(session->cmdsn); | |
669 | if (hdr->itt != RESERVED_ITT) { | |
052d0144 | 670 | /* |
4f704dc0 | 671 | * TODO: We always use immediate for normal session pdus. |
052d0144 MC |
672 | * If we start to send tmfs or nops as non-immediate then |
673 | * we should start checking the cmdsn numbers for mgmt tasks. | |
4f704dc0 MC |
674 | * |
675 | * During discovery sessions iscsid sends TEXT as non immediate, | |
676 | * but we always only send one PDU at a time. | |
052d0144 MC |
677 | */ |
678 | if (conn->c_stage == ISCSI_CONN_STARTED && | |
679 | !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { | |
680 | session->queued_cmdsn++; | |
681 | session->cmdsn++; | |
682 | } | |
683 | } | |
684 | ||
ae15f801 MC |
685 | if (session->tt->init_task && session->tt->init_task(task)) |
686 | return -EIO; | |
052d0144 MC |
687 | |
688 | if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT) | |
689 | session->state = ISCSI_STATE_LOGGING_OUT; | |
690 | ||
577577da | 691 | task->state = ISCSI_TASK_RUNNING; |
1b2c7af8 MC |
692 | ISCSI_DBG_SESSION(session, "mgmtpdu [op 0x%x hdr->itt 0x%x " |
693 | "datalen %d]\n", hdr->opcode & ISCSI_OPCODE_MASK, | |
694 | hdr->itt, task->data_count); | |
052d0144 MC |
695 | return 0; |
696 | } | |
697 | ||
6e637b72 MC |
698 | /** |
699 | * iscsi_alloc_mgmt_task - allocate and setup a mgmt task. | |
700 | * @conn: iscsi conn that the task will be sent on. | |
701 | * @hdr: iscsi pdu that will be sent. | |
702 | * @data: buffer for data segment if needed. | |
703 | * @data_size: length of data in bytes. | |
704 | */ | |
9c19a7d0 | 705 | static struct iscsi_task * |
6e637b72 | 706 | iscsi_alloc_mgmt_task(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
f6d5180c MC |
707 | char *data, uint32_t data_size) |
708 | { | |
709 | struct iscsi_session *session = conn->session; | |
4f704dc0 | 710 | uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK; |
9c19a7d0 | 711 | struct iscsi_task *task; |
262ef636 | 712 | itt_t itt; |
f6d5180c | 713 | |
44ac9710 MC |
714 | if (session->state == ISCSI_STATE_TERMINATE || |
715 | !test_bit(ISCSI_CONN_FLAG_BOUND, &conn->flags)) | |
f6d5180c MC |
716 | return NULL; |
717 | ||
4f704dc0 | 718 | if (opcode == ISCSI_OP_LOGIN || opcode == ISCSI_OP_TEXT) { |
f6d5180c MC |
719 | /* |
720 | * Login and Text are sent serially, in | |
721 | * request-followed-by-response sequence. | |
3e5c28ad MC |
722 | * Same task can be used. Same ITT must be used. |
723 | * Note that login_task is preallocated at conn_create(). | |
f6d5180c | 724 | */ |
4f704dc0 MC |
725 | if (conn->login_task->state != ISCSI_TASK_FREE) { |
726 | iscsi_conn_printk(KERN_ERR, conn, "Login/Text in " | |
727 | "progress. Cannot start new task.\n"); | |
728 | return NULL; | |
729 | } | |
730 | ||
cbaa4221 MC |
731 | if (data_size > ISCSI_DEF_MAX_RECV_SEG_LEN) { |
732 | 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); | |
733 | return NULL; | |
734 | } | |
735 | ||
9c19a7d0 | 736 | task = conn->login_task; |
4f704dc0 | 737 | } else { |
26013ad4 MC |
738 | if (session->state != ISCSI_STATE_LOGGED_IN) |
739 | return NULL; | |
740 | ||
cbaa4221 MC |
741 | if (data_size != 0) { |
742 | iscsi_conn_printk(KERN_ERR, conn, "Can not send data buffer of len %u for op 0x%x\n", data_size, opcode); | |
743 | return NULL; | |
744 | } | |
745 | ||
f6d5180c MC |
746 | BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE); |
747 | BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED); | |
748 | ||
7acd72eb | 749 | if (!kfifo_out(&session->cmdpool.queue, |
9c19a7d0 | 750 | (void*)&task, sizeof(void*))) |
f6d5180c MC |
751 | return NULL; |
752 | } | |
3e5c28ad MC |
753 | /* |
754 | * released in complete pdu for task we expect a response for, and | |
755 | * released by the lld when it has transmitted the task for | |
756 | * pdus we do not expect a response for. | |
757 | */ | |
6dc618cd | 758 | refcount_set(&task->refcount, 1); |
9c19a7d0 MC |
759 | task->conn = conn; |
760 | task->sc = NULL; | |
3bbaaad9 MC |
761 | INIT_LIST_HEAD(&task->running); |
762 | task->state = ISCSI_TASK_PENDING; | |
f6d5180c MC |
763 | |
764 | if (data_size) { | |
9c19a7d0 MC |
765 | memcpy(task->data, data, data_size); |
766 | task->data_count = data_size; | |
f6d5180c | 767 | } else |
9c19a7d0 | 768 | task->data_count = 0; |
f6d5180c | 769 | |
184b57c6 MC |
770 | if (conn->session->tt->alloc_pdu) { |
771 | if (conn->session->tt->alloc_pdu(task, hdr->opcode)) { | |
772 | iscsi_conn_printk(KERN_ERR, conn, "Could not allocate " | |
773 | "pdu for mgmt task.\n"); | |
3bbaaad9 | 774 | goto free_task; |
184b57c6 | 775 | } |
577577da | 776 | } |
184b57c6 | 777 | |
262ef636 | 778 | itt = task->hdr->itt; |
577577da | 779 | task->hdr_len = sizeof(struct iscsi_hdr); |
9c19a7d0 | 780 | memcpy(task->hdr, hdr, sizeof(struct iscsi_hdr)); |
262ef636 MC |
781 | |
782 | if (hdr->itt != RESERVED_ITT) { | |
783 | if (session->tt->parse_pdu_itt) | |
784 | task->hdr->itt = itt; | |
785 | else | |
786 | task->hdr->itt = build_itt(task->itt, | |
787 | task->conn->session->age); | |
788 | } | |
789 | ||
6e637b72 MC |
790 | return task; |
791 | ||
792 | free_task: | |
793 | iscsi_put_task(task); | |
794 | return NULL; | |
795 | } | |
796 | ||
797 | /** | |
798 | * iscsi_send_mgmt_task - Send task created with iscsi_alloc_mgmt_task. | |
799 | * @task: iscsi task to send. | |
800 | * | |
801 | * On failure this returns a non-zero error code, and the driver must free | |
802 | * the task with iscsi_put_task; | |
803 | */ | |
804 | static int iscsi_send_mgmt_task(struct iscsi_task *task) | |
805 | { | |
806 | struct iscsi_conn *conn = task->conn; | |
807 | struct iscsi_session *session = conn->session; | |
808 | struct iscsi_host *ihost = shost_priv(conn->session->host); | |
809 | int rc = 0; | |
fe0a8a95 | 810 | |
1336aed1 | 811 | if (!ihost->workq) { |
6e637b72 MC |
812 | rc = iscsi_prep_mgmt_task(conn, task); |
813 | if (rc) | |
814 | return rc; | |
052d0144 | 815 | |
6e637b72 MC |
816 | rc = session->tt->xmit_task(task); |
817 | if (rc) | |
818 | return rc; | |
3bbaaad9 MC |
819 | } else { |
820 | list_add_tail(&task->running, &conn->mgmtqueue); | |
4b9f8ce4 | 821 | iscsi_conn_queue_xmit(conn); |
3bbaaad9 | 822 | } |
052d0144 | 823 | |
6e637b72 MC |
824 | return 0; |
825 | } | |
577577da | 826 | |
6e637b72 MC |
827 | static int __iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
828 | char *data, uint32_t data_size) | |
829 | { | |
830 | struct iscsi_task *task; | |
831 | int rc; | |
832 | ||
833 | task = iscsi_alloc_mgmt_task(conn, hdr, data, data_size); | |
834 | if (!task) | |
835 | return -ENOMEM; | |
836 | ||
837 | rc = iscsi_send_mgmt_task(task); | |
838 | if (rc) | |
839 | iscsi_put_task(task); | |
840 | return rc; | |
f6d5180c MC |
841 | } |
842 | ||
843 | int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr, | |
844 | char *data, uint32_t data_size) | |
845 | { | |
846 | struct iscsi_conn *conn = cls_conn->dd_data; | |
847 | struct iscsi_session *session = conn->session; | |
848 | int err = 0; | |
849 | ||
659743b0 | 850 | spin_lock_bh(&session->frwd_lock); |
6e637b72 | 851 | if (__iscsi_conn_send_pdu(conn, hdr, data, data_size)) |
f6d5180c | 852 | err = -EPERM; |
659743b0 | 853 | spin_unlock_bh(&session->frwd_lock); |
f6d5180c MC |
854 | return err; |
855 | } | |
856 | EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu); | |
857 | ||
7996a778 | 858 | /** |
ae6b4e69 | 859 | * iscsi_scsi_cmd_rsp - SCSI Command Response processing |
7996a778 MC |
860 | * @conn: iscsi connection |
861 | * @hdr: iscsi header | |
9c19a7d0 | 862 | * @task: scsi command task |
7996a778 MC |
863 | * @data: cmd data buffer |
864 | * @datalen: len of buffer | |
865 | * | |
866 | * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and | |
a656183e | 867 | * then completes the command and task. called under back_lock |
7996a778 | 868 | **/ |
77a23c21 | 869 | static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
9c19a7d0 | 870 | struct iscsi_task *task, char *data, |
77a23c21 | 871 | int datalen) |
7996a778 | 872 | { |
12352183 | 873 | struct iscsi_scsi_rsp *rhdr = (struct iscsi_scsi_rsp *)hdr; |
7996a778 | 874 | struct iscsi_session *session = conn->session; |
9c19a7d0 | 875 | struct scsi_cmnd *sc = task->sc; |
7996a778 | 876 | |
77a23c21 | 877 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr); |
7996a778 MC |
878 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; |
879 | ||
880 | sc->result = (DID_OK << 16) | rhdr->cmd_status; | |
881 | ||
55e51eda SG |
882 | if (task->protected) { |
883 | sector_t sector; | |
884 | u8 ascq; | |
885 | ||
886 | /** | |
887 | * Transports that didn't implement check_protection | |
888 | * callback but still published T10-PI support to scsi-mid | |
889 | * deserve this BUG_ON. | |
890 | **/ | |
891 | BUG_ON(!session->tt->check_protection); | |
892 | ||
893 | ascq = session->tt->check_protection(task, §or); | |
894 | if (ascq) { | |
f2b1e9c6 | 895 | scsi_build_sense(sc, 1, ILLEGAL_REQUEST, 0x10, ascq); |
a73c2a2f SG |
896 | scsi_set_sense_information(sc->sense_buffer, |
897 | SCSI_SENSE_BUFFERSIZE, | |
898 | sector); | |
55e51eda SG |
899 | goto out; |
900 | } | |
901 | } | |
902 | ||
7996a778 MC |
903 | if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) { |
904 | sc->result = DID_ERROR << 16; | |
905 | goto out; | |
906 | } | |
907 | ||
908 | if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) { | |
9b80cb4b | 909 | uint16_t senselen; |
7996a778 MC |
910 | |
911 | if (datalen < 2) { | |
912 | invalid_datalen: | |
322d739d MC |
913 | iscsi_conn_printk(KERN_ERR, conn, |
914 | "Got CHECK_CONDITION but invalid data " | |
915 | "buffer size of %d\n", datalen); | |
7996a778 MC |
916 | sc->result = DID_BAD_TARGET << 16; |
917 | goto out; | |
918 | } | |
919 | ||
8f333991 | 920 | senselen = get_unaligned_be16(data); |
7996a778 MC |
921 | if (datalen < senselen) |
922 | goto invalid_datalen; | |
923 | ||
924 | memcpy(sc->sense_buffer, data + 2, | |
9b80cb4b | 925 | min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE)); |
1b2c7af8 MC |
926 | ISCSI_DBG_SESSION(session, "copied %d bytes of sense\n", |
927 | min_t(uint16_t, senselen, | |
928 | SCSI_SENSE_BUFFERSIZE)); | |
7996a778 MC |
929 | } |
930 | ||
c07d4444 BH |
931 | if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW | |
932 | ISCSI_FLAG_CMD_BIDI_OVERFLOW)) { | |
ae3d56d8 | 933 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; |
c07d4444 BH |
934 | } |
935 | ||
7207fea4 BH |
936 | if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW | |
937 | ISCSI_FLAG_CMD_OVERFLOW)) { | |
7996a778 MC |
938 | int res_count = be32_to_cpu(rhdr->residual_count); |
939 | ||
7207fea4 BH |
940 | if (res_count > 0 && |
941 | (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || | |
942 | res_count <= scsi_bufflen(sc))) | |
c07d4444 | 943 | /* write side for bidi or uni-io set_resid */ |
1c138991 | 944 | scsi_set_resid(sc, res_count); |
7996a778 MC |
945 | else |
946 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
c07d4444 | 947 | } |
7996a778 | 948 | out: |
3bbaaad9 | 949 | ISCSI_DBG_SESSION(session, "cmd rsp done [sc %p res %d itt 0x%x]\n", |
1b2c7af8 | 950 | sc, sc->result, task->itt); |
7996a778 | 951 | conn->scsirsp_pdus_cnt++; |
b3cd5050 | 952 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); |
7996a778 MC |
953 | } |
954 | ||
1d9edf02 MC |
955 | /** |
956 | * iscsi_data_in_rsp - SCSI Data-In Response processing | |
957 | * @conn: iscsi connection | |
958 | * @hdr: iscsi pdu | |
959 | * @task: scsi command task | |
a656183e LD |
960 | * |
961 | * iscsi_data_in_rsp sets up the scsi_cmnd fields based on the data received | |
962 | * then completes the command and task. called under back_lock | |
1d9edf02 MC |
963 | **/ |
964 | static void | |
965 | iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
966 | struct iscsi_task *task) | |
967 | { | |
968 | struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)hdr; | |
969 | struct scsi_cmnd *sc = task->sc; | |
970 | ||
971 | if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS)) | |
972 | return; | |
973 | ||
edbc9aa0 | 974 | iscsi_update_cmdsn(conn->session, (struct iscsi_nopin *)hdr); |
1d9edf02 MC |
975 | sc->result = (DID_OK << 16) | rhdr->cmd_status; |
976 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; | |
977 | if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW | | |
978 | ISCSI_FLAG_DATA_OVERFLOW)) { | |
979 | int res_count = be32_to_cpu(rhdr->residual_count); | |
980 | ||
981 | if (res_count > 0 && | |
982 | (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || | |
ae3d56d8 | 983 | res_count <= sc->sdb.length)) |
960bf87a | 984 | scsi_set_resid(sc, res_count); |
1d9edf02 MC |
985 | else |
986 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
987 | } | |
988 | ||
3bbaaad9 MC |
989 | ISCSI_DBG_SESSION(conn->session, "data in with status done " |
990 | "[sc %p res %d itt 0x%x]\n", | |
991 | sc, sc->result, task->itt); | |
1d9edf02 | 992 | conn->scsirsp_pdus_cnt++; |
b3cd5050 | 993 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); |
1d9edf02 MC |
994 | } |
995 | ||
7ea8b828 MC |
996 | static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr) |
997 | { | |
998 | struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr; | |
ec29d0ac | 999 | struct iscsi_session *session = conn->session; |
7ea8b828 MC |
1000 | |
1001 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
1002 | conn->tmfrsp_pdus_cnt++; | |
1003 | ||
ec29d0ac | 1004 | if (session->tmf_state != TMF_QUEUED) |
7ea8b828 MC |
1005 | return; |
1006 | ||
1007 | if (tmf->response == ISCSI_TMF_RSP_COMPLETE) | |
ec29d0ac | 1008 | session->tmf_state = TMF_SUCCESS; |
7ea8b828 | 1009 | else if (tmf->response == ISCSI_TMF_RSP_NO_TASK) |
ec29d0ac | 1010 | session->tmf_state = TMF_NOT_FOUND; |
7ea8b828 | 1011 | else |
ec29d0ac MC |
1012 | session->tmf_state = TMF_FAILED; |
1013 | wake_up(&session->ehwait); | |
7ea8b828 MC |
1014 | } |
1015 | ||
52f5664a | 1016 | static int iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr) |
f6d5180c MC |
1017 | { |
1018 | struct iscsi_nopout hdr; | |
9c19a7d0 | 1019 | struct iscsi_task *task; |
f6d5180c | 1020 | |
fe0a8a95 LD |
1021 | if (!rhdr) { |
1022 | if (READ_ONCE(conn->ping_task)) | |
1023 | return -EINVAL; | |
fe0a8a95 | 1024 | } |
f6d5180c MC |
1025 | |
1026 | memset(&hdr, 0, sizeof(struct iscsi_nopout)); | |
1027 | hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE; | |
1028 | hdr.flags = ISCSI_FLAG_CMD_FINAL; | |
1029 | ||
1030 | if (rhdr) { | |
55bdabdf | 1031 | hdr.lun = rhdr->lun; |
f6d5180c MC |
1032 | hdr.ttt = rhdr->ttt; |
1033 | hdr.itt = RESERVED_ITT; | |
1034 | } else | |
1035 | hdr.ttt = RESERVED_ITT; | |
1036 | ||
6e637b72 MC |
1037 | task = iscsi_alloc_mgmt_task(conn, (struct iscsi_hdr *)&hdr, NULL, 0); |
1038 | if (!task) | |
1039 | return -ENOMEM; | |
1040 | ||
1041 | if (!rhdr) | |
1042 | WRITE_ONCE(conn->ping_task, task); | |
1043 | ||
1044 | if (iscsi_send_mgmt_task(task)) { | |
fe0a8a95 LD |
1045 | if (!rhdr) |
1046 | WRITE_ONCE(conn->ping_task, NULL); | |
6e637b72 MC |
1047 | iscsi_put_task(task); |
1048 | ||
322d739d | 1049 | iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n"); |
52f5664a AN |
1050 | return -EIO; |
1051 | } else if (!rhdr) { | |
d3acf022 | 1052 | /* only track our nops */ |
d3acf022 MC |
1053 | conn->last_ping = jiffies; |
1054 | } | |
52f5664a AN |
1055 | |
1056 | return 0; | |
f6d5180c MC |
1057 | } |
1058 | ||
a656183e LD |
1059 | /** |
1060 | * iscsi_nop_out_rsp - SCSI NOP Response processing | |
1061 | * @task: scsi command task | |
1062 | * @nop: the nop structure | |
1063 | * @data: where to put the data | |
1064 | * @datalen: length of data | |
1065 | * | |
1066 | * iscsi_nop_out_rsp handles nop response from use or | |
1067 | * from user space. called under back_lock | |
1068 | **/ | |
8afa1439 MC |
1069 | static int iscsi_nop_out_rsp(struct iscsi_task *task, |
1070 | struct iscsi_nopin *nop, char *data, int datalen) | |
1071 | { | |
1072 | struct iscsi_conn *conn = task->conn; | |
1073 | int rc = 0; | |
1074 | ||
fe0a8a95 | 1075 | if (READ_ONCE(conn->ping_task) != task) { |
8afa1439 MC |
1076 | /* |
1077 | * If this is not in response to one of our | |
1078 | * nops then it must be from userspace. | |
1079 | */ | |
1080 | if (iscsi_recv_pdu(conn->cls_conn, (struct iscsi_hdr *)nop, | |
1081 | data, datalen)) | |
1082 | rc = ISCSI_ERR_CONN_FAILED; | |
1083 | } else | |
1084 | mod_timer(&conn->transport_timer, jiffies + conn->recv_timeout); | |
1085 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); | |
1086 | return rc; | |
1087 | } | |
1088 | ||
62f38300 MC |
1089 | static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
1090 | char *data, int datalen) | |
1091 | { | |
1092 | struct iscsi_reject *reject = (struct iscsi_reject *)hdr; | |
1093 | struct iscsi_hdr rejected_pdu; | |
8afa1439 | 1094 | int opcode, rc = 0; |
62f38300 MC |
1095 | |
1096 | conn->exp_statsn = be32_to_cpu(reject->statsn) + 1; | |
1097 | ||
8afa1439 MC |
1098 | if (ntoh24(reject->dlength) > datalen || |
1099 | ntoh24(reject->dlength) < sizeof(struct iscsi_hdr)) { | |
1100 | iscsi_conn_printk(KERN_ERR, conn, "Cannot handle rejected " | |
1101 | "pdu. Invalid data length (pdu dlength " | |
1102 | "%u, datalen %d\n", ntoh24(reject->dlength), | |
1103 | datalen); | |
1104 | return ISCSI_ERR_PROTO; | |
1105 | } | |
1106 | memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr)); | |
1107 | opcode = rejected_pdu.opcode & ISCSI_OPCODE_MASK; | |
1108 | ||
1109 | switch (reject->reason) { | |
1110 | case ISCSI_REASON_DATA_DIGEST_ERROR: | |
1111 | iscsi_conn_printk(KERN_ERR, conn, | |
1112 | "pdu (op 0x%x itt 0x%x) rejected " | |
1113 | "due to DataDigest error.\n", | |
e5dbbe27 | 1114 | opcode, rejected_pdu.itt); |
8afa1439 MC |
1115 | break; |
1116 | case ISCSI_REASON_IMM_CMD_REJECT: | |
1117 | iscsi_conn_printk(KERN_ERR, conn, | |
1118 | "pdu (op 0x%x itt 0x%x) rejected. Too many " | |
1119 | "immediate commands.\n", | |
e5dbbe27 | 1120 | opcode, rejected_pdu.itt); |
8afa1439 MC |
1121 | /* |
1122 | * We only send one TMF at a time so if the target could not | |
1123 | * handle it, then it should get fixed (RFC mandates that | |
1124 | * a target can handle one immediate TMF per conn). | |
1125 | * | |
1126 | * For nops-outs, we could have sent more than one if | |
1127 | * the target is sending us lots of nop-ins | |
1128 | */ | |
1129 | if (opcode != ISCSI_OP_NOOP_OUT) | |
1130 | return 0; | |
62f38300 | 1131 | |
4dec6a8f | 1132 | if (rejected_pdu.itt == cpu_to_be32(ISCSI_RESERVED_TAG)) { |
8afa1439 MC |
1133 | /* |
1134 | * nop-out in response to target's nop-out rejected. | |
1135 | * Just resend. | |
1136 | */ | |
659743b0 SP |
1137 | /* In RX path we are under back lock */ |
1138 | spin_unlock(&conn->session->back_lock); | |
1139 | spin_lock(&conn->session->frwd_lock); | |
8afa1439 MC |
1140 | iscsi_send_nopout(conn, |
1141 | (struct iscsi_nopin*)&rejected_pdu); | |
659743b0 SP |
1142 | spin_unlock(&conn->session->frwd_lock); |
1143 | spin_lock(&conn->session->back_lock); | |
1144 | } else { | |
8afa1439 MC |
1145 | struct iscsi_task *task; |
1146 | /* | |
1147 | * Our nop as ping got dropped. We know the target | |
1148 | * and transport are ok so just clean up | |
1149 | */ | |
1150 | task = iscsi_itt_to_task(conn, rejected_pdu.itt); | |
1151 | if (!task) { | |
1152 | iscsi_conn_printk(KERN_ERR, conn, | |
1153 | "Invalid pdu reject. Could " | |
1154 | "not lookup rejected task.\n"); | |
1155 | rc = ISCSI_ERR_BAD_ITT; | |
1156 | } else | |
1157 | rc = iscsi_nop_out_rsp(task, | |
1158 | (struct iscsi_nopin*)&rejected_pdu, | |
1159 | NULL, 0); | |
62f38300 | 1160 | } |
8afa1439 MC |
1161 | break; |
1162 | default: | |
1163 | iscsi_conn_printk(KERN_ERR, conn, | |
1164 | "pdu (op 0x%x itt 0x%x) rejected. Reason " | |
e5dbbe27 VC |
1165 | "code 0x%x\n", rejected_pdu.opcode, |
1166 | rejected_pdu.itt, reject->reason); | |
8afa1439 | 1167 | break; |
62f38300 | 1168 | } |
8afa1439 | 1169 | return rc; |
62f38300 MC |
1170 | } |
1171 | ||
913e5bf4 MC |
1172 | /** |
1173 | * iscsi_itt_to_task - look up task by itt | |
1174 | * @conn: iscsi connection | |
1175 | * @itt: itt | |
1176 | * | |
1177 | * This should be used for mgmt tasks like login and nops, or if | |
1178 | * the LDD's itt space does not include the session age. | |
1179 | * | |
659743b0 | 1180 | * The session back_lock must be held. |
913e5bf4 | 1181 | */ |
8f9256ce | 1182 | struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *conn, itt_t itt) |
913e5bf4 MC |
1183 | { |
1184 | struct iscsi_session *session = conn->session; | |
262ef636 | 1185 | int i; |
913e5bf4 MC |
1186 | |
1187 | if (itt == RESERVED_ITT) | |
1188 | return NULL; | |
1189 | ||
262ef636 MC |
1190 | if (session->tt->parse_pdu_itt) |
1191 | session->tt->parse_pdu_itt(conn, itt, &i, NULL); | |
1192 | else | |
1193 | i = get_itt(itt); | |
913e5bf4 MC |
1194 | if (i >= session->cmds_max) |
1195 | return NULL; | |
1196 | ||
1197 | return session->cmds[i]; | |
1198 | } | |
8f9256ce | 1199 | EXPORT_SYMBOL_GPL(iscsi_itt_to_task); |
913e5bf4 | 1200 | |
7996a778 MC |
1201 | /** |
1202 | * __iscsi_complete_pdu - complete pdu | |
1203 | * @conn: iscsi conn | |
1204 | * @hdr: iscsi header | |
1205 | * @data: data buffer | |
1206 | * @datalen: len of data buffer | |
1207 | * | |
1208 | * Completes pdu processing by freeing any resources allocated at | |
659743b0 | 1209 | * queuecommand or send generic. session back_lock must be held and verify |
7996a778 MC |
1210 | * itt must have been called. |
1211 | */ | |
913e5bf4 MC |
1212 | int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
1213 | char *data, int datalen) | |
7996a778 MC |
1214 | { |
1215 | struct iscsi_session *session = conn->session; | |
1216 | int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0; | |
9c19a7d0 | 1217 | struct iscsi_task *task; |
7996a778 MC |
1218 | uint32_t itt; |
1219 | ||
f6d5180c | 1220 | conn->last_recv = jiffies; |
0af967f5 MC |
1221 | rc = iscsi_verify_itt(conn, hdr->itt); |
1222 | if (rc) | |
1223 | return rc; | |
1224 | ||
b4377356 AV |
1225 | if (hdr->itt != RESERVED_ITT) |
1226 | itt = get_itt(hdr->itt); | |
7996a778 | 1227 | else |
b4377356 | 1228 | itt = ~0U; |
7996a778 | 1229 | |
1b2c7af8 MC |
1230 | ISCSI_DBG_SESSION(session, "[op 0x%x cid %d itt 0x%x len %d]\n", |
1231 | opcode, conn->id, itt, datalen); | |
7996a778 | 1232 | |
3e5c28ad | 1233 | if (itt == ~0U) { |
77a23c21 | 1234 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); |
62f38300 | 1235 | |
7996a778 MC |
1236 | switch(opcode) { |
1237 | case ISCSI_OP_NOOP_IN: | |
40527afe | 1238 | if (datalen) { |
7996a778 | 1239 | rc = ISCSI_ERR_PROTO; |
40527afe MC |
1240 | break; |
1241 | } | |
1242 | ||
b4377356 | 1243 | if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG)) |
40527afe MC |
1244 | break; |
1245 | ||
659743b0 SP |
1246 | /* In RX path we are under back lock */ |
1247 | spin_unlock(&session->back_lock); | |
1248 | spin_lock(&session->frwd_lock); | |
f6d5180c | 1249 | iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr); |
659743b0 SP |
1250 | spin_unlock(&session->frwd_lock); |
1251 | spin_lock(&session->back_lock); | |
7996a778 MC |
1252 | break; |
1253 | case ISCSI_OP_REJECT: | |
62f38300 MC |
1254 | rc = iscsi_handle_reject(conn, hdr, data, datalen); |
1255 | break; | |
7996a778 | 1256 | case ISCSI_OP_ASYNC_EVENT: |
8d2860b3 | 1257 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; |
5831c737 MC |
1258 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) |
1259 | rc = ISCSI_ERR_CONN_FAILED; | |
7996a778 MC |
1260 | break; |
1261 | default: | |
1262 | rc = ISCSI_ERR_BAD_OPCODE; | |
1263 | break; | |
1264 | } | |
3e5c28ad MC |
1265 | goto out; |
1266 | } | |
1267 | ||
3e5c28ad MC |
1268 | switch(opcode) { |
1269 | case ISCSI_OP_SCSI_CMD_RSP: | |
913e5bf4 MC |
1270 | case ISCSI_OP_SCSI_DATA_IN: |
1271 | task = iscsi_itt_to_ctask(conn, hdr->itt); | |
1272 | if (!task) | |
1273 | return ISCSI_ERR_BAD_ITT; | |
d355e57d | 1274 | task->last_xfer = jiffies; |
913e5bf4 MC |
1275 | break; |
1276 | case ISCSI_OP_R2T: | |
1277 | /* | |
1278 | * LLD handles R2Ts if they need to. | |
1279 | */ | |
1280 | return 0; | |
1281 | case ISCSI_OP_LOGOUT_RSP: | |
1282 | case ISCSI_OP_LOGIN_RSP: | |
1283 | case ISCSI_OP_TEXT_RSP: | |
1284 | case ISCSI_OP_SCSI_TMFUNC_RSP: | |
1285 | case ISCSI_OP_NOOP_IN: | |
1286 | task = iscsi_itt_to_task(conn, hdr->itt); | |
1287 | if (!task) | |
1288 | return ISCSI_ERR_BAD_ITT; | |
1289 | break; | |
1290 | default: | |
1291 | return ISCSI_ERR_BAD_OPCODE; | |
1292 | } | |
1293 | ||
1294 | switch(opcode) { | |
1295 | case ISCSI_OP_SCSI_CMD_RSP: | |
9c19a7d0 | 1296 | iscsi_scsi_cmd_rsp(conn, hdr, task, data, datalen); |
3e5c28ad MC |
1297 | break; |
1298 | case ISCSI_OP_SCSI_DATA_IN: | |
1d9edf02 | 1299 | iscsi_data_in_rsp(conn, hdr, task); |
3e5c28ad | 1300 | break; |
3e5c28ad MC |
1301 | case ISCSI_OP_LOGOUT_RSP: |
1302 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
1303 | if (datalen) { | |
1304 | rc = ISCSI_ERR_PROTO; | |
1305 | break; | |
1306 | } | |
1307 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
1308 | goto recv_pdu; | |
1309 | case ISCSI_OP_LOGIN_RSP: | |
1310 | case ISCSI_OP_TEXT_RSP: | |
1311 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
1312 | /* | |
1313 | * login related PDU's exp_statsn is handled in | |
1314 | * userspace | |
1315 | */ | |
1316 | goto recv_pdu; | |
1317 | case ISCSI_OP_SCSI_TMFUNC_RSP: | |
1318 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
1319 | if (datalen) { | |
1320 | rc = ISCSI_ERR_PROTO; | |
1321 | break; | |
1322 | } | |
1323 | ||
1324 | iscsi_tmf_rsp(conn, hdr); | |
b3cd5050 | 1325 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); |
3e5c28ad MC |
1326 | break; |
1327 | case ISCSI_OP_NOOP_IN: | |
1328 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
1329 | if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) { | |
1330 | rc = ISCSI_ERR_PROTO; | |
1331 | break; | |
1332 | } | |
1333 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
1334 | ||
8afa1439 MC |
1335 | rc = iscsi_nop_out_rsp(task, (struct iscsi_nopin*)hdr, |
1336 | data, datalen); | |
3e5c28ad MC |
1337 | break; |
1338 | default: | |
1339 | rc = ISCSI_ERR_BAD_OPCODE; | |
1340 | break; | |
1341 | } | |
7996a778 | 1342 | |
3e5c28ad MC |
1343 | out: |
1344 | return rc; | |
1345 | recv_pdu: | |
1346 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) | |
1347 | rc = ISCSI_ERR_CONN_FAILED; | |
b3cd5050 | 1348 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); |
7996a778 MC |
1349 | return rc; |
1350 | } | |
913e5bf4 | 1351 | EXPORT_SYMBOL_GPL(__iscsi_complete_pdu); |
7996a778 MC |
1352 | |
1353 | int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
1354 | char *data, int datalen) | |
1355 | { | |
1356 | int rc; | |
1357 | ||
659743b0 | 1358 | spin_lock(&conn->session->back_lock); |
7996a778 | 1359 | rc = __iscsi_complete_pdu(conn, hdr, data, datalen); |
659743b0 | 1360 | spin_unlock(&conn->session->back_lock); |
7996a778 MC |
1361 | return rc; |
1362 | } | |
1363 | EXPORT_SYMBOL_GPL(iscsi_complete_pdu); | |
1364 | ||
0af967f5 | 1365 | int iscsi_verify_itt(struct iscsi_conn *conn, itt_t itt) |
7996a778 MC |
1366 | { |
1367 | struct iscsi_session *session = conn->session; | |
262ef636 | 1368 | int age = 0, i = 0; |
7996a778 | 1369 | |
0af967f5 MC |
1370 | if (itt == RESERVED_ITT) |
1371 | return 0; | |
7996a778 | 1372 | |
262ef636 MC |
1373 | if (session->tt->parse_pdu_itt) |
1374 | session->tt->parse_pdu_itt(conn, itt, &i, &age); | |
1375 | else { | |
1376 | i = get_itt(itt); | |
1377 | age = ((__force u32)itt >> ISCSI_AGE_SHIFT) & ISCSI_AGE_MASK; | |
1378 | } | |
1379 | ||
1380 | if (age != session->age) { | |
0af967f5 MC |
1381 | iscsi_conn_printk(KERN_ERR, conn, |
1382 | "received itt %x expected session age (%x)\n", | |
913e5bf4 | 1383 | (__force u32)itt, session->age); |
0af967f5 MC |
1384 | return ISCSI_ERR_BAD_ITT; |
1385 | } | |
7996a778 | 1386 | |
3e5c28ad MC |
1387 | if (i >= session->cmds_max) { |
1388 | iscsi_conn_printk(KERN_ERR, conn, | |
1389 | "received invalid itt index %u (max cmds " | |
1390 | "%u.\n", i, session->cmds_max); | |
1391 | return ISCSI_ERR_BAD_ITT; | |
7996a778 | 1392 | } |
7996a778 MC |
1393 | return 0; |
1394 | } | |
1395 | EXPORT_SYMBOL_GPL(iscsi_verify_itt); | |
1396 | ||
913e5bf4 MC |
1397 | /** |
1398 | * iscsi_itt_to_ctask - look up ctask by itt | |
1399 | * @conn: iscsi connection | |
1400 | * @itt: itt | |
1401 | * | |
1402 | * This should be used for cmd tasks. | |
1403 | * | |
659743b0 | 1404 | * The session back_lock must be held. |
913e5bf4 MC |
1405 | */ |
1406 | struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *conn, itt_t itt) | |
0af967f5 | 1407 | { |
9c19a7d0 | 1408 | struct iscsi_task *task; |
0af967f5 MC |
1409 | |
1410 | if (iscsi_verify_itt(conn, itt)) | |
1411 | return NULL; | |
1412 | ||
913e5bf4 MC |
1413 | task = iscsi_itt_to_task(conn, itt); |
1414 | if (!task || !task->sc) | |
0af967f5 MC |
1415 | return NULL; |
1416 | ||
db22de3e | 1417 | if (iscsi_cmd(task->sc)->age != conn->session->age) { |
913e5bf4 MC |
1418 | iscsi_session_printk(KERN_ERR, conn->session, |
1419 | "task's session age %d, expected %d\n", | |
db22de3e | 1420 | iscsi_cmd(task->sc)->age, conn->session->age); |
0af967f5 | 1421 | return NULL; |
913e5bf4 | 1422 | } |
0af967f5 | 1423 | |
9c19a7d0 | 1424 | return task; |
0af967f5 MC |
1425 | } |
1426 | EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask); | |
1427 | ||
40a06e75 | 1428 | void iscsi_session_failure(struct iscsi_session *session, |
e5bd7b54 MC |
1429 | enum iscsi_err err) |
1430 | { | |
e5bd7b54 | 1431 | struct iscsi_conn *conn; |
e5bd7b54 | 1432 | |
659743b0 | 1433 | spin_lock_bh(&session->frwd_lock); |
e5bd7b54 MC |
1434 | conn = session->leadconn; |
1435 | if (session->state == ISCSI_STATE_TERMINATE || !conn) { | |
659743b0 | 1436 | spin_unlock_bh(&session->frwd_lock); |
e5bd7b54 MC |
1437 | return; |
1438 | } | |
1439 | ||
b1d19e8c | 1440 | iscsi_get_conn(conn->cls_conn); |
659743b0 | 1441 | spin_unlock_bh(&session->frwd_lock); |
e5bd7b54 MC |
1442 | /* |
1443 | * if the host is being removed bypass the connection | |
1444 | * recovery initialization because we are going to kill | |
1445 | * the session. | |
1446 | */ | |
1447 | if (err == ISCSI_ERR_INVALID_HOST) | |
1448 | iscsi_conn_error_event(conn->cls_conn, err); | |
1449 | else | |
1450 | iscsi_conn_failure(conn, err); | |
b1d19e8c | 1451 | iscsi_put_conn(conn->cls_conn); |
e5bd7b54 MC |
1452 | } |
1453 | EXPORT_SYMBOL_GPL(iscsi_session_failure); | |
1454 | ||
891e2639 | 1455 | static bool iscsi_set_conn_failed(struct iscsi_conn *conn) |
7996a778 MC |
1456 | { |
1457 | struct iscsi_session *session = conn->session; | |
7996a778 | 1458 | |
891e2639 MC |
1459 | if (session->state == ISCSI_STATE_FAILED) |
1460 | return false; | |
656cffc9 | 1461 | |
67a61114 | 1462 | if (conn->stop_stage == 0) |
7996a778 | 1463 | session->state = ISCSI_STATE_FAILED; |
e5bd7b54 | 1464 | |
5bd85625 MC |
1465 | set_bit(ISCSI_CONN_FLAG_SUSPEND_TX, &conn->flags); |
1466 | set_bit(ISCSI_CONN_FLAG_SUSPEND_RX, &conn->flags); | |
891e2639 MC |
1467 | return true; |
1468 | } | |
1469 | ||
1470 | void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err) | |
1471 | { | |
1472 | struct iscsi_session *session = conn->session; | |
1473 | bool needs_evt; | |
1474 | ||
1475 | spin_lock_bh(&session->frwd_lock); | |
1476 | needs_evt = iscsi_set_conn_failed(conn); | |
1477 | spin_unlock_bh(&session->frwd_lock); | |
1478 | ||
1479 | if (needs_evt) | |
1480 | iscsi_conn_error_event(conn->cls_conn, err); | |
7996a778 MC |
1481 | } |
1482 | EXPORT_SYMBOL_GPL(iscsi_conn_failure); | |
1483 | ||
77a23c21 MC |
1484 | static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn) |
1485 | { | |
1486 | struct iscsi_session *session = conn->session; | |
1487 | ||
1488 | /* | |
1489 | * Check for iSCSI window and take care of CmdSN wrap-around | |
1490 | */ | |
e0726407 | 1491 | if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) { |
1b2c7af8 MC |
1492 | ISCSI_DBG_SESSION(session, "iSCSI CmdSN closed. ExpCmdSn " |
1493 | "%u MaxCmdSN %u CmdSN %u/%u\n", | |
1494 | session->exp_cmdsn, session->max_cmdsn, | |
1495 | session->cmdsn, session->queued_cmdsn); | |
77a23c21 MC |
1496 | return -ENOSPC; |
1497 | } | |
1498 | return 0; | |
1499 | } | |
1500 | ||
5923d64b MC |
1501 | static int iscsi_xmit_task(struct iscsi_conn *conn, struct iscsi_task *task, |
1502 | bool was_requeue) | |
77a23c21 | 1503 | { |
843c0a8a | 1504 | int rc; |
77a23c21 | 1505 | |
5923d64b | 1506 | if (!conn->task) { |
e1c6a7ec MC |
1507 | /* |
1508 | * Take a ref so we can access it after xmit_task(). | |
1509 | * | |
1510 | * This should never fail because the failure paths will have | |
1511 | * stopped the xmit thread. | |
1512 | */ | |
1513 | if (!iscsi_get_task(task)) { | |
e1c6a7ec MC |
1514 | WARN_ON_ONCE(1); |
1515 | return 0; | |
1516 | } | |
5923d64b MC |
1517 | } else { |
1518 | /* Already have a ref from when we failed to send it last call */ | |
1519 | conn->task = NULL; | |
1520 | } | |
1521 | ||
1522 | /* | |
1523 | * If this was a requeue for a R2T we have an extra ref on the task in | |
1524 | * case a bad target sends a cmd rsp before we have handled the task. | |
1525 | */ | |
1526 | if (was_requeue) | |
6d626150 | 1527 | iscsi_put_task(task); |
5923d64b MC |
1528 | |
1529 | /* | |
1530 | * Do this after dropping the extra ref because if this was a requeue | |
1531 | * it's removed from that list and cleanup_queued_task would miss it. | |
1532 | */ | |
5bd85625 | 1533 | if (test_bit(ISCSI_CONN_FLAG_SUSPEND_TX, &conn->flags)) { |
5923d64b MC |
1534 | /* |
1535 | * Save the task and ref in case we weren't cleaning up this | |
1536 | * task and get woken up again. | |
1537 | */ | |
1538 | conn->task = task; | |
79edd00d AS |
1539 | return -ENODATA; |
1540 | } | |
5923d64b | 1541 | |
659743b0 | 1542 | spin_unlock_bh(&conn->session->frwd_lock); |
9c19a7d0 | 1543 | rc = conn->session->tt->xmit_task(task); |
659743b0 | 1544 | spin_lock_bh(&conn->session->frwd_lock); |
d355e57d | 1545 | if (!rc) { |
9c19a7d0 | 1546 | /* done with this task */ |
d355e57d | 1547 | task->last_xfer = jiffies; |
6d626150 | 1548 | } else { |
5923d64b MC |
1549 | /* |
1550 | * get an extra ref that is released next time we access it | |
1551 | * as conn->task above. | |
1552 | */ | |
e1c6a7ec | 1553 | iscsi_get_task(task); |
5923d64b MC |
1554 | conn->task = task; |
1555 | } | |
1556 | ||
6d626150 | 1557 | iscsi_put_task(task); |
77a23c21 MC |
1558 | return rc; |
1559 | } | |
1560 | ||
843c0a8a | 1561 | /** |
9c19a7d0 MC |
1562 | * iscsi_requeue_task - requeue task to run from session workqueue |
1563 | * @task: task to requeue | |
843c0a8a | 1564 | * |
5923d64b | 1565 | * Callers must have taken a ref to the task that is going to be requeued. |
843c0a8a | 1566 | */ |
9c19a7d0 | 1567 | void iscsi_requeue_task(struct iscsi_task *task) |
843c0a8a | 1568 | { |
9c19a7d0 | 1569 | struct iscsi_conn *conn = task->conn; |
843c0a8a | 1570 | |
3bbaaad9 MC |
1571 | /* |
1572 | * this may be on the requeue list already if the xmit_task callout | |
1573 | * is handling the r2ts while we are adding new ones | |
1574 | */ | |
5923d64b MC |
1575 | spin_lock_bh(&conn->session->frwd_lock); |
1576 | if (list_empty(&task->running)) { | |
3bbaaad9 | 1577 | list_add_tail(&task->running, &conn->requeue); |
5923d64b MC |
1578 | } else { |
1579 | /* | |
1580 | * Don't need the extra ref since it's already requeued and | |
1581 | * has a ref. | |
1582 | */ | |
1583 | iscsi_put_task(task); | |
1584 | } | |
4b9f8ce4 | 1585 | iscsi_conn_queue_xmit(conn); |
5923d64b | 1586 | spin_unlock_bh(&conn->session->frwd_lock); |
843c0a8a | 1587 | } |
9c19a7d0 | 1588 | EXPORT_SYMBOL_GPL(iscsi_requeue_task); |
843c0a8a | 1589 | |
7996a778 MC |
1590 | /** |
1591 | * iscsi_data_xmit - xmit any command into the scheduled connection | |
1592 | * @conn: iscsi connection | |
1593 | * | |
1594 | * Notes: | |
1595 | * The function can return -EAGAIN in which case the caller must | |
1596 | * re-schedule it again later or recover. '0' return code means | |
1597 | * successful xmit. | |
1598 | **/ | |
1599 | static int iscsi_data_xmit(struct iscsi_conn *conn) | |
1600 | { | |
5d12c05e | 1601 | struct iscsi_task *task; |
3219e529 | 1602 | int rc = 0; |
7996a778 | 1603 | |
659743b0 | 1604 | spin_lock_bh(&conn->session->frwd_lock); |
5bd85625 | 1605 | if (test_bit(ISCSI_CONN_FLAG_SUSPEND_TX, &conn->flags)) { |
1b2c7af8 | 1606 | ISCSI_DBG_SESSION(conn->session, "Tx suspended!\n"); |
659743b0 | 1607 | spin_unlock_bh(&conn->session->frwd_lock); |
3219e529 | 1608 | return -ENODATA; |
7996a778 | 1609 | } |
7996a778 | 1610 | |
9c19a7d0 | 1611 | if (conn->task) { |
5923d64b | 1612 | rc = iscsi_xmit_task(conn, conn->task, false); |
3219e529 | 1613 | if (rc) |
70b31c15 | 1614 | goto done; |
7996a778 MC |
1615 | } |
1616 | ||
77a23c21 MC |
1617 | /* |
1618 | * process mgmt pdus like nops before commands since we should | |
1619 | * only have one nop-out as a ping from us and targets should not | |
1620 | * overflow us with nop-ins | |
1621 | */ | |
1622 | check_mgmt: | |
843c0a8a | 1623 | while (!list_empty(&conn->mgmtqueue)) { |
5923d64b MC |
1624 | task = list_entry(conn->mgmtqueue.next, struct iscsi_task, |
1625 | running); | |
1626 | list_del_init(&task->running); | |
1627 | if (iscsi_prep_mgmt_task(conn, task)) { | |
659743b0 SP |
1628 | /* regular RX path uses back_lock */ |
1629 | spin_lock_bh(&conn->session->back_lock); | |
5923d64b | 1630 | __iscsi_put_task(task); |
659743b0 | 1631 | spin_unlock_bh(&conn->session->back_lock); |
b3a7ea8d MC |
1632 | continue; |
1633 | } | |
5923d64b | 1634 | rc = iscsi_xmit_task(conn, task, false); |
77a23c21 | 1635 | if (rc) |
70b31c15 | 1636 | goto done; |
7996a778 MC |
1637 | } |
1638 | ||
65080c51 DB |
1639 | check_requeue: |
1640 | while (!list_empty(&conn->requeue)) { | |
1641 | /* | |
1642 | * we always do fastlogout - conn stop code will clean up. | |
1643 | */ | |
1644 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) | |
1645 | break; | |
1646 | ||
1647 | task = list_entry(conn->requeue.next, struct iscsi_task, | |
1648 | running); | |
1649 | ||
1650 | if (iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_DATA_OUT)) | |
1651 | break; | |
1652 | ||
1653 | list_del_init(&task->running); | |
1654 | rc = iscsi_xmit_task(conn, task, true); | |
1655 | if (rc) | |
1656 | goto done; | |
1657 | if (!list_empty(&conn->mgmtqueue)) | |
1658 | goto check_mgmt; | |
1659 | } | |
1660 | ||
843c0a8a | 1661 | /* process pending command queue */ |
3bbaaad9 | 1662 | while (!list_empty(&conn->cmdqueue)) { |
5923d64b MC |
1663 | task = list_entry(conn->cmdqueue.next, struct iscsi_task, |
1664 | running); | |
1665 | list_del_init(&task->running); | |
b3a7ea8d | 1666 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) { |
5923d64b | 1667 | fail_scsi_task(task, DID_IMM_RETRY); |
b3a7ea8d MC |
1668 | continue; |
1669 | } | |
5923d64b | 1670 | rc = iscsi_prep_scsi_cmd_pdu(task); |
577577da | 1671 | if (rc) { |
d28d48c6 | 1672 | if (rc == -ENOMEM || rc == -EACCES) |
5923d64b | 1673 | fail_scsi_task(task, DID_IMM_RETRY); |
d28d48c6 | 1674 | else |
5923d64b | 1675 | fail_scsi_task(task, DID_ABORT); |
004d6530 BH |
1676 | continue; |
1677 | } | |
5923d64b | 1678 | rc = iscsi_xmit_task(conn, task, false); |
77a23c21 | 1679 | if (rc) |
70b31c15 | 1680 | goto done; |
77a23c21 | 1681 | /* |
9c19a7d0 | 1682 | * we could continuously get new task requests so |
77a23c21 MC |
1683 | * we need to check the mgmt queue for nops that need to |
1684 | * be sent to aviod starvation | |
1685 | */ | |
843c0a8a MC |
1686 | if (!list_empty(&conn->mgmtqueue)) |
1687 | goto check_mgmt; | |
65080c51 DB |
1688 | if (!list_empty(&conn->requeue)) |
1689 | goto check_requeue; | |
843c0a8a MC |
1690 | } |
1691 | ||
659743b0 | 1692 | spin_unlock_bh(&conn->session->frwd_lock); |
3219e529 | 1693 | return -ENODATA; |
7996a778 | 1694 | |
70b31c15 | 1695 | done: |
659743b0 | 1696 | spin_unlock_bh(&conn->session->frwd_lock); |
3219e529 | 1697 | return rc; |
7996a778 MC |
1698 | } |
1699 | ||
c4028958 | 1700 | static void iscsi_xmitworker(struct work_struct *work) |
7996a778 | 1701 | { |
c4028958 DH |
1702 | struct iscsi_conn *conn = |
1703 | container_of(work, struct iscsi_conn, xmitwork); | |
3219e529 | 1704 | int rc; |
7996a778 MC |
1705 | /* |
1706 | * serialize Xmit worker on a per-connection basis. | |
1707 | */ | |
3219e529 MC |
1708 | do { |
1709 | rc = iscsi_data_xmit(conn); | |
1710 | } while (rc >= 0 || rc == -EAGAIN); | |
7996a778 MC |
1711 | } |
1712 | ||
577577da MC |
1713 | static inline struct iscsi_task *iscsi_alloc_task(struct iscsi_conn *conn, |
1714 | struct scsi_cmnd *sc) | |
1715 | { | |
1716 | struct iscsi_task *task; | |
1717 | ||
7acd72eb | 1718 | if (!kfifo_out(&conn->session->cmdpool.queue, |
577577da MC |
1719 | (void *) &task, sizeof(void *))) |
1720 | return NULL; | |
1721 | ||
db22de3e BVA |
1722 | iscsi_cmd(sc)->age = conn->session->age; |
1723 | iscsi_cmd(sc)->task = task; | |
577577da | 1724 | |
6dc618cd | 1725 | refcount_set(&task->refcount, 1); |
577577da MC |
1726 | task->state = ISCSI_TASK_PENDING; |
1727 | task->conn = conn; | |
1728 | task->sc = sc; | |
d355e57d MC |
1729 | task->have_checked_conn = false; |
1730 | task->last_timeout = jiffies; | |
1731 | task->last_xfer = jiffies; | |
55e51eda | 1732 | task->protected = false; |
577577da MC |
1733 | INIT_LIST_HEAD(&task->running); |
1734 | return task; | |
1735 | } | |
1736 | ||
7996a778 MC |
1737 | enum { |
1738 | FAILURE_BAD_HOST = 1, | |
1739 | FAILURE_SESSION_FAILED, | |
1740 | FAILURE_SESSION_FREED, | |
1741 | FAILURE_WINDOW_CLOSED, | |
60ecebf5 | 1742 | FAILURE_OOM, |
7996a778 | 1743 | FAILURE_SESSION_TERMINATE, |
656cffc9 | 1744 | FAILURE_SESSION_IN_RECOVERY, |
7996a778 | 1745 | FAILURE_SESSION_RECOVERY_TIMEOUT, |
b3a7ea8d | 1746 | FAILURE_SESSION_LOGGING_OUT, |
6eabafbe | 1747 | FAILURE_SESSION_NOT_READY, |
7996a778 MC |
1748 | }; |
1749 | ||
f41d4721 | 1750 | int iscsi_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc) |
7996a778 | 1751 | { |
75613521 | 1752 | struct iscsi_cls_session *cls_session; |
1336aed1 | 1753 | struct iscsi_host *ihost; |
7996a778 MC |
1754 | int reason = 0; |
1755 | struct iscsi_session *session; | |
1756 | struct iscsi_conn *conn; | |
9c19a7d0 | 1757 | struct iscsi_task *task = NULL; |
7996a778 | 1758 | |
7996a778 | 1759 | sc->result = 0; |
db22de3e | 1760 | iscsi_cmd(sc)->task = NULL; |
7996a778 | 1761 | |
1336aed1 | 1762 | ihost = shost_priv(host); |
7996a778 | 1763 | |
75613521 MC |
1764 | cls_session = starget_to_session(scsi_target(sc->device)); |
1765 | session = cls_session->dd_data; | |
659743b0 | 1766 | spin_lock_bh(&session->frwd_lock); |
7996a778 | 1767 | |
75613521 | 1768 | reason = iscsi_session_chkready(cls_session); |
6eabafbe MC |
1769 | if (reason) { |
1770 | sc->result = reason; | |
1771 | goto fault; | |
1772 | } | |
1773 | ||
301e0f7e | 1774 | if (session->state != ISCSI_STATE_LOGGED_IN) { |
656cffc9 MC |
1775 | /* |
1776 | * to handle the race between when we set the recovery state | |
1777 | * and block the session we requeue here (commands could | |
1778 | * be entering our queuecommand while a block is starting | |
1779 | * up because the block code is not locked) | |
1780 | */ | |
9000bcd6 | 1781 | switch (session->state) { |
301e0f7e | 1782 | case ISCSI_STATE_FAILED: |
d7549412 RDT |
1783 | /* |
1784 | * cmds should fail during shutdown, if the session | |
1785 | * state is bad, allowing completion to happen | |
1786 | */ | |
1787 | if (unlikely(system_state != SYSTEM_RUNNING)) { | |
1788 | reason = FAILURE_SESSION_FAILED; | |
1789 | sc->result = DID_NO_CONNECT << 16; | |
1790 | break; | |
1791 | } | |
df561f66 | 1792 | fallthrough; |
9000bcd6 | 1793 | case ISCSI_STATE_IN_RECOVERY: |
656cffc9 | 1794 | reason = FAILURE_SESSION_IN_RECOVERY; |
301e0f7e MC |
1795 | sc->result = DID_IMM_RETRY << 16; |
1796 | break; | |
9000bcd6 MC |
1797 | case ISCSI_STATE_LOGGING_OUT: |
1798 | reason = FAILURE_SESSION_LOGGING_OUT; | |
301e0f7e MC |
1799 | sc->result = DID_IMM_RETRY << 16; |
1800 | break; | |
b3a7ea8d | 1801 | case ISCSI_STATE_RECOVERY_FAILED: |
656cffc9 | 1802 | reason = FAILURE_SESSION_RECOVERY_TIMEOUT; |
56d7fcfa | 1803 | sc->result = DID_TRANSPORT_FAILFAST << 16; |
b3a7ea8d MC |
1804 | break; |
1805 | case ISCSI_STATE_TERMINATE: | |
656cffc9 | 1806 | reason = FAILURE_SESSION_TERMINATE; |
6eabafbe | 1807 | sc->result = DID_NO_CONNECT << 16; |
b3a7ea8d | 1808 | break; |
b3a7ea8d | 1809 | default: |
656cffc9 | 1810 | reason = FAILURE_SESSION_FREED; |
6eabafbe | 1811 | sc->result = DID_NO_CONNECT << 16; |
b3a7ea8d | 1812 | } |
7996a778 MC |
1813 | goto fault; |
1814 | } | |
1815 | ||
7996a778 | 1816 | conn = session->leadconn; |
98644047 MC |
1817 | if (!conn) { |
1818 | reason = FAILURE_SESSION_FREED; | |
6eabafbe | 1819 | sc->result = DID_NO_CONNECT << 16; |
98644047 MC |
1820 | goto fault; |
1821 | } | |
7996a778 | 1822 | |
5bd85625 | 1823 | if (test_bit(ISCSI_CONN_FLAG_SUSPEND_TX, &conn->flags)) { |
661134ad | 1824 | reason = FAILURE_SESSION_IN_RECOVERY; |
eef9ffdf | 1825 | sc->result = DID_REQUEUE << 16; |
661134ad MC |
1826 | goto fault; |
1827 | } | |
1828 | ||
77a23c21 MC |
1829 | if (iscsi_check_cmdsn_window_closed(conn)) { |
1830 | reason = FAILURE_WINDOW_CLOSED; | |
1831 | goto reject; | |
1832 | } | |
1833 | ||
577577da MC |
1834 | task = iscsi_alloc_task(conn, sc); |
1835 | if (!task) { | |
60ecebf5 MC |
1836 | reason = FAILURE_OOM; |
1837 | goto reject; | |
1838 | } | |
7996a778 | 1839 | |
1336aed1 | 1840 | if (!ihost->workq) { |
577577da MC |
1841 | reason = iscsi_prep_scsi_cmd_pdu(task); |
1842 | if (reason) { | |
5d12c05e | 1843 | if (reason == -ENOMEM || reason == -EACCES) { |
577577da MC |
1844 | reason = FAILURE_OOM; |
1845 | goto prepd_reject; | |
1846 | } else { | |
1847 | sc->result = DID_ABORT << 16; | |
1848 | goto prepd_fault; | |
1849 | } | |
052d0144 | 1850 | } |
9c19a7d0 | 1851 | if (session->tt->xmit_task(task)) { |
d3305f34 | 1852 | session->cmdsn--; |
052d0144 | 1853 | reason = FAILURE_SESSION_NOT_READY; |
577577da | 1854 | goto prepd_reject; |
052d0144 | 1855 | } |
3bbaaad9 MC |
1856 | } else { |
1857 | list_add_tail(&task->running, &conn->cmdqueue); | |
4b9f8ce4 | 1858 | iscsi_conn_queue_xmit(conn); |
3bbaaad9 | 1859 | } |
052d0144 MC |
1860 | |
1861 | session->queued_cmdsn++; | |
659743b0 | 1862 | spin_unlock_bh(&session->frwd_lock); |
7996a778 MC |
1863 | return 0; |
1864 | ||
577577da | 1865 | prepd_reject: |
a656183e | 1866 | spin_lock_bh(&session->back_lock); |
f41d4721 | 1867 | iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ); |
a656183e | 1868 | spin_unlock_bh(&session->back_lock); |
7996a778 | 1869 | reject: |
659743b0 | 1870 | spin_unlock_bh(&session->frwd_lock); |
1b2c7af8 MC |
1871 | ISCSI_DBG_SESSION(session, "cmd 0x%x rejected (%d)\n", |
1872 | sc->cmnd[0], reason); | |
d6d13ee1 | 1873 | return SCSI_MLQUEUE_TARGET_BUSY; |
7996a778 | 1874 | |
577577da | 1875 | prepd_fault: |
a656183e | 1876 | spin_lock_bh(&session->back_lock); |
f41d4721 | 1877 | iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ); |
a656183e | 1878 | spin_unlock_bh(&session->back_lock); |
7996a778 | 1879 | fault: |
659743b0 | 1880 | spin_unlock_bh(&session->frwd_lock); |
1b2c7af8 MC |
1881 | ISCSI_DBG_SESSION(session, "iscsi: cmd 0x%x is not queued (%d)\n", |
1882 | sc->cmnd[0], reason); | |
ae3d56d8 | 1883 | scsi_set_resid(sc, scsi_bufflen(sc)); |
b4b84edc | 1884 | scsi_done(sc); |
7996a778 MC |
1885 | return 0; |
1886 | } | |
1887 | EXPORT_SYMBOL_GPL(iscsi_queuecommand); | |
1888 | ||
6b5d6c44 MC |
1889 | int iscsi_target_alloc(struct scsi_target *starget) |
1890 | { | |
1891 | struct iscsi_cls_session *cls_session = starget_to_session(starget); | |
1892 | struct iscsi_session *session = cls_session->dd_data; | |
1893 | ||
1894 | starget->can_queue = session->scsi_cmds_max; | |
1895 | return 0; | |
1896 | } | |
1897 | EXPORT_SYMBOL_GPL(iscsi_target_alloc); | |
1898 | ||
2c4b9637 | 1899 | static void iscsi_tmf_timedout(struct timer_list *t) |
7996a778 | 1900 | { |
ec29d0ac | 1901 | struct iscsi_session *session = from_timer(session, t, tmf_timer); |
7996a778 | 1902 | |
659743b0 | 1903 | spin_lock(&session->frwd_lock); |
ec29d0ac MC |
1904 | if (session->tmf_state == TMF_QUEUED) { |
1905 | session->tmf_state = TMF_TIMEDOUT; | |
bd2199d4 | 1906 | ISCSI_DBG_EH(session, "tmf timedout\n"); |
7996a778 | 1907 | /* unblock eh_abort() */ |
ec29d0ac | 1908 | wake_up(&session->ehwait); |
7996a778 | 1909 | } |
659743b0 | 1910 | spin_unlock(&session->frwd_lock); |
7996a778 MC |
1911 | } |
1912 | ||
9c19a7d0 | 1913 | static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn, |
f6d5180c MC |
1914 | struct iscsi_tm *hdr, int age, |
1915 | int timeout) | |
1360c58a | 1916 | __must_hold(&session->frwd_lock) |
7996a778 | 1917 | { |
7996a778 | 1918 | struct iscsi_session *session = conn->session; |
7996a778 | 1919 | |
6e637b72 | 1920 | if (__iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr, NULL, 0)) { |
659743b0 | 1921 | spin_unlock_bh(&session->frwd_lock); |
df4da5cd | 1922 | iscsi_conn_printk(KERN_ERR, conn, "Could not send TMF.\n"); |
7996a778 | 1923 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
659743b0 | 1924 | spin_lock_bh(&session->frwd_lock); |
77a23c21 | 1925 | return -EPERM; |
7996a778 | 1926 | } |
843c0a8a | 1927 | conn->tmfcmd_pdus_cnt++; |
ec29d0ac MC |
1928 | session->tmf_timer.expires = timeout * HZ + jiffies; |
1929 | add_timer(&session->tmf_timer); | |
bd2199d4 | 1930 | ISCSI_DBG_EH(session, "tmf set timeout\n"); |
7996a778 | 1931 | |
659743b0 | 1932 | spin_unlock_bh(&session->frwd_lock); |
6724add1 | 1933 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1934 | |
1935 | /* | |
1936 | * block eh thread until: | |
1937 | * | |
843c0a8a MC |
1938 | * 1) tmf response |
1939 | * 2) tmf timeout | |
7996a778 MC |
1940 | * 3) session is terminated or restarted or userspace has |
1941 | * given up on recovery | |
1942 | */ | |
ec29d0ac | 1943 | wait_event_interruptible(session->ehwait, age != session->age || |
7996a778 | 1944 | session->state != ISCSI_STATE_LOGGED_IN || |
ec29d0ac | 1945 | session->tmf_state != TMF_QUEUED); |
7996a778 MC |
1946 | if (signal_pending(current)) |
1947 | flush_signals(current); | |
ec29d0ac | 1948 | del_timer_sync(&session->tmf_timer); |
843c0a8a | 1949 | |
6724add1 | 1950 | mutex_lock(&session->eh_mutex); |
659743b0 | 1951 | spin_lock_bh(&session->frwd_lock); |
9c19a7d0 | 1952 | /* if the session drops it will clean up the task */ |
843c0a8a MC |
1953 | if (age != session->age || |
1954 | session->state != ISCSI_STATE_LOGGED_IN) | |
1955 | return -ENOTCONN; | |
7996a778 MC |
1956 | return 0; |
1957 | } | |
1958 | ||
843c0a8a | 1959 | /* |
14936b1e | 1960 | * Fail commands. session frwd lock held and xmit thread flushed. |
843c0a8a | 1961 | */ |
9cb78c16 | 1962 | static void fail_scsi_tasks(struct iscsi_conn *conn, u64 lun, int error) |
843c0a8a | 1963 | { |
14936b1e | 1964 | struct iscsi_session *session = conn->session; |
3bbaaad9 MC |
1965 | struct iscsi_task *task; |
1966 | int i; | |
843c0a8a | 1967 | |
e1c6a7ec | 1968 | restart_cmd_loop: |
14936b1e MC |
1969 | spin_lock_bh(&session->back_lock); |
1970 | for (i = 0; i < session->cmds_max; i++) { | |
1971 | task = session->cmds[i]; | |
3bbaaad9 MC |
1972 | if (!task->sc || task->state == ISCSI_TASK_FREE) |
1973 | continue; | |
843c0a8a | 1974 | |
3bbaaad9 MC |
1975 | if (lun != -1 && lun != task->sc->device->lun) |
1976 | continue; | |
e1c6a7ec MC |
1977 | /* |
1978 | * The cmd is completing but if this is called from an eh | |
1979 | * callout path then when we return scsi-ml owns the cmd. Wait | |
1980 | * for the completion path to finish freeing the cmd. | |
1981 | */ | |
1982 | if (!iscsi_get_task(task)) { | |
1983 | spin_unlock_bh(&session->back_lock); | |
1984 | spin_unlock_bh(&session->frwd_lock); | |
1985 | udelay(ISCSI_CMD_COMPL_WAIT); | |
1986 | spin_lock_bh(&session->frwd_lock); | |
1987 | goto restart_cmd_loop; | |
1988 | } | |
14936b1e MC |
1989 | |
1990 | ISCSI_DBG_SESSION(session, | |
3bbaaad9 MC |
1991 | "failing sc %p itt 0x%x state %d\n", |
1992 | task->sc, task->itt, task->state); | |
e1c6a7ec MC |
1993 | __fail_scsi_task(task, error); |
1994 | __iscsi_put_task(task); | |
843c0a8a | 1995 | } |
14936b1e | 1996 | spin_unlock_bh(&session->back_lock); |
843c0a8a MC |
1997 | } |
1998 | ||
661134ad MC |
1999 | /** |
2000 | * iscsi_suspend_queue - suspend iscsi_queuecommand | |
2001 | * @conn: iscsi conn to stop queueing IO on | |
2002 | * | |
659743b0 | 2003 | * This grabs the session frwd_lock to make sure no one is in |
661134ad MC |
2004 | * xmit_task/queuecommand, and then sets suspend to prevent |
2005 | * new commands from being queued. This only needs to be called | |
2006 | * by offload drivers that need to sync a path like ep disconnect | |
2007 | * with the iscsi_queuecommand/xmit_task. To start IO again libiscsi | |
2008 | * will call iscsi_start_tx and iscsi_unblock_session when in FFP. | |
2009 | */ | |
2010 | void iscsi_suspend_queue(struct iscsi_conn *conn) | |
2011 | { | |
659743b0 | 2012 | spin_lock_bh(&conn->session->frwd_lock); |
5bd85625 | 2013 | set_bit(ISCSI_CONN_FLAG_SUSPEND_TX, &conn->flags); |
659743b0 | 2014 | spin_unlock_bh(&conn->session->frwd_lock); |
661134ad MC |
2015 | } |
2016 | EXPORT_SYMBOL_GPL(iscsi_suspend_queue); | |
2017 | ||
2018 | /** | |
2019 | * iscsi_suspend_tx - suspend iscsi_data_xmit | |
8af80996 | 2020 | * @conn: iscsi conn to stop processing IO on. |
661134ad MC |
2021 | * |
2022 | * This function sets the suspend bit to prevent iscsi_data_xmit | |
2023 | * from sending new IO, and if work is queued on the xmit thread | |
2024 | * it will wait for it to be completed. | |
2025 | */ | |
b40977d9 | 2026 | void iscsi_suspend_tx(struct iscsi_conn *conn) |
6724add1 | 2027 | { |
32ae763e MC |
2028 | struct Scsi_Host *shost = conn->session->host; |
2029 | struct iscsi_host *ihost = shost_priv(shost); | |
2030 | ||
5bd85625 | 2031 | set_bit(ISCSI_CONN_FLAG_SUSPEND_TX, &conn->flags); |
1336aed1 | 2032 | if (ihost->workq) |
8af80996 | 2033 | flush_work(&conn->xmitwork); |
6724add1 | 2034 | } |
b40977d9 | 2035 | EXPORT_SYMBOL_GPL(iscsi_suspend_tx); |
6724add1 MC |
2036 | |
2037 | static void iscsi_start_tx(struct iscsi_conn *conn) | |
2038 | { | |
5bd85625 | 2039 | clear_bit(ISCSI_CONN_FLAG_SUSPEND_TX, &conn->flags); |
4b9f8ce4 | 2040 | iscsi_conn_queue_xmit(conn); |
6724add1 MC |
2041 | } |
2042 | ||
8af80996 MC |
2043 | /** |
2044 | * iscsi_suspend_rx - Prevent recvwork from running again. | |
2045 | * @conn: iscsi conn to stop. | |
2046 | */ | |
2047 | void iscsi_suspend_rx(struct iscsi_conn *conn) | |
2048 | { | |
2049 | struct Scsi_Host *shost = conn->session->host; | |
2050 | struct iscsi_host *ihost = shost_priv(shost); | |
2051 | ||
2052 | set_bit(ISCSI_CONN_FLAG_SUSPEND_RX, &conn->flags); | |
2053 | if (ihost->workq) | |
2054 | flush_work(&conn->recvwork); | |
2055 | } | |
2056 | EXPORT_SYMBOL_GPL(iscsi_suspend_rx); | |
2057 | ||
4c48a829 MC |
2058 | /* |
2059 | * We want to make sure a ping is in flight. It has timed out. | |
2060 | * And we are not busy processing a pdu that is making | |
2061 | * progress but got started before the ping and is taking a while | |
2062 | * to complete so the ping is just stuck behind it in a queue. | |
2063 | */ | |
2064 | static int iscsi_has_ping_timed_out(struct iscsi_conn *conn) | |
2065 | { | |
fe0a8a95 | 2066 | if (READ_ONCE(conn->ping_task) && |
4c48a829 MC |
2067 | time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) + |
2068 | (conn->ping_timeout * HZ), jiffies)) | |
2069 | return 1; | |
2070 | else | |
2071 | return 0; | |
2072 | } | |
2073 | ||
dee7121e | 2074 | enum scsi_timeout_action iscsi_eh_cmd_timed_out(struct scsi_cmnd *sc) |
f6d5180c | 2075 | { |
dee7121e | 2076 | enum scsi_timeout_action rc = SCSI_EH_NOT_HANDLED; |
92ed4d69 | 2077 | struct iscsi_task *task = NULL, *running_task; |
f6d5180c MC |
2078 | struct iscsi_cls_session *cls_session; |
2079 | struct iscsi_session *session; | |
2080 | struct iscsi_conn *conn; | |
92ed4d69 | 2081 | int i; |
f6d5180c | 2082 | |
d355e57d | 2083 | cls_session = starget_to_session(scsi_target(sc->device)); |
75613521 | 2084 | session = cls_session->dd_data; |
f6d5180c | 2085 | |
bd2199d4 | 2086 | ISCSI_DBG_EH(session, "scsi cmd %p timedout\n", sc); |
f6d5180c | 2087 | |
5480e299 | 2088 | spin_lock_bh(&session->frwd_lock); |
14936b1e | 2089 | spin_lock(&session->back_lock); |
db22de3e | 2090 | task = iscsi_cmd(sc)->task; |
e3d338a5 MC |
2091 | if (!task) { |
2092 | /* | |
2093 | * Raced with completion. Blk layer has taken ownership | |
2094 | * so let timeout code complete it now. | |
2095 | */ | |
dee7121e | 2096 | rc = SCSI_EH_NOT_HANDLED; |
14936b1e | 2097 | spin_unlock(&session->back_lock); |
e3d338a5 MC |
2098 | goto done; |
2099 | } | |
e1c6a7ec MC |
2100 | if (!iscsi_get_task(task)) { |
2101 | /* | |
2102 | * Racing with the completion path right now, so give it more | |
2103 | * time so that path can complete it like normal. | |
2104 | */ | |
dee7121e | 2105 | rc = SCSI_EH_RESET_TIMER; |
e1c6a7ec MC |
2106 | task = NULL; |
2107 | spin_unlock(&session->back_lock); | |
2108 | goto done; | |
2109 | } | |
14936b1e | 2110 | spin_unlock(&session->back_lock); |
e3d338a5 | 2111 | |
f6d5180c | 2112 | if (session->state != ISCSI_STATE_LOGGED_IN) { |
d7549412 RDT |
2113 | /* |
2114 | * During shutdown, if session is prematurely disconnected, | |
2115 | * recovery won't happen and there will be hung cmds. Not | |
2116 | * handling cmds would trigger EH, also bad in this case. | |
2117 | * Instead, handle cmd, allow completion to happen and let | |
2118 | * upper layer to deal with the result. | |
2119 | */ | |
2120 | if (unlikely(system_state != SYSTEM_RUNNING)) { | |
2121 | sc->result = DID_NO_CONNECT << 16; | |
2122 | ISCSI_DBG_EH(session, "sc on shutdown, handled\n"); | |
dee7121e | 2123 | rc = SCSI_EH_NOT_HANDLED; |
d7549412 RDT |
2124 | goto done; |
2125 | } | |
f6d5180c MC |
2126 | /* |
2127 | * We are probably in the middle of iscsi recovery so let | |
2128 | * that complete and handle the error. | |
2129 | */ | |
dee7121e | 2130 | rc = SCSI_EH_RESET_TIMER; |
f6d5180c MC |
2131 | goto done; |
2132 | } | |
2133 | ||
2134 | conn = session->leadconn; | |
2135 | if (!conn) { | |
2136 | /* In the middle of shuting down */ | |
dee7121e | 2137 | rc = SCSI_EH_RESET_TIMER; |
f6d5180c MC |
2138 | goto done; |
2139 | } | |
2140 | ||
d355e57d MC |
2141 | /* |
2142 | * If we have sent (at least queued to the network layer) a pdu or | |
2143 | * recvd one for the task since the last timeout ask for | |
2144 | * more time. If on the next timeout we have not made progress | |
2145 | * we can check if it is the task or connection when we send the | |
2146 | * nop as a ping. | |
2147 | */ | |
92ed4d69 | 2148 | if (time_after(task->last_xfer, task->last_timeout)) { |
bd2199d4 EZ |
2149 | ISCSI_DBG_EH(session, "Command making progress. Asking " |
2150 | "scsi-ml for more time to complete. " | |
92ed4d69 | 2151 | "Last data xfer at %lu. Last timeout was at " |
bd2199d4 | 2152 | "%lu\n.", task->last_xfer, task->last_timeout); |
d355e57d | 2153 | task->have_checked_conn = false; |
dee7121e | 2154 | rc = SCSI_EH_RESET_TIMER; |
d355e57d MC |
2155 | goto done; |
2156 | } | |
2157 | ||
f6d5180c MC |
2158 | if (!conn->recv_timeout && !conn->ping_timeout) |
2159 | goto done; | |
2160 | /* | |
2161 | * if the ping timedout then we are in the middle of cleaning up | |
2162 | * and can let the iscsi eh handle it | |
2163 | */ | |
4c48a829 | 2164 | if (iscsi_has_ping_timed_out(conn)) { |
dee7121e | 2165 | rc = SCSI_EH_RESET_TIMER; |
4c48a829 MC |
2166 | goto done; |
2167 | } | |
d355e57d | 2168 | |
14936b1e | 2169 | spin_lock(&session->back_lock); |
92ed4d69 MC |
2170 | for (i = 0; i < conn->session->cmds_max; i++) { |
2171 | running_task = conn->session->cmds[i]; | |
2172 | if (!running_task->sc || running_task == task || | |
2173 | running_task->state != ISCSI_TASK_RUNNING) | |
2174 | continue; | |
2175 | ||
2176 | /* | |
2177 | * Only check if cmds started before this one have made | |
2178 | * progress, or this could never fail | |
2179 | */ | |
2180 | if (time_after(running_task->sc->jiffies_at_alloc, | |
2181 | task->sc->jiffies_at_alloc)) | |
2182 | continue; | |
2183 | ||
2184 | if (time_after(running_task->last_xfer, task->last_timeout)) { | |
2185 | /* | |
2186 | * This task has not made progress, but a task | |
2187 | * started before us has transferred data since | |
2188 | * we started/last-checked. We could be queueing | |
2189 | * too many tasks or the LU is bad. | |
2190 | * | |
2191 | * If the device is bad the cmds ahead of us on | |
2192 | * other devs will complete, and this loop will | |
2193 | * eventually fail starting the scsi eh. | |
2194 | */ | |
2195 | ISCSI_DBG_EH(session, "Command has not made progress " | |
2196 | "but commands ahead of it have. " | |
2197 | "Asking scsi-ml for more time to " | |
2198 | "complete. Our last xfer vs running task " | |
2199 | "last xfer %lu/%lu. Last check %lu.\n", | |
2200 | task->last_xfer, running_task->last_xfer, | |
2201 | task->last_timeout); | |
14936b1e | 2202 | spin_unlock(&session->back_lock); |
dee7121e | 2203 | rc = SCSI_EH_RESET_TIMER; |
92ed4d69 MC |
2204 | goto done; |
2205 | } | |
2206 | } | |
14936b1e | 2207 | spin_unlock(&session->back_lock); |
92ed4d69 | 2208 | |
d355e57d MC |
2209 | /* Assumes nop timeout is shorter than scsi cmd timeout */ |
2210 | if (task->have_checked_conn) | |
2211 | goto done; | |
2212 | ||
f6d5180c | 2213 | /* |
d355e57d MC |
2214 | * Checking the transport already or nop from a cmd timeout still |
2215 | * running | |
f6d5180c | 2216 | */ |
fe0a8a95 | 2217 | if (READ_ONCE(conn->ping_task)) { |
d355e57d | 2218 | task->have_checked_conn = true; |
dee7121e | 2219 | rc = SCSI_EH_RESET_TIMER; |
4c48a829 MC |
2220 | goto done; |
2221 | } | |
2222 | ||
d355e57d MC |
2223 | /* Make sure there is a transport check done */ |
2224 | iscsi_send_nopout(conn, NULL); | |
2225 | task->have_checked_conn = true; | |
dee7121e | 2226 | rc = SCSI_EH_RESET_TIMER; |
d355e57d | 2227 | |
f6d5180c | 2228 | done: |
5480e299 | 2229 | spin_unlock_bh(&session->frwd_lock); |
14936b1e MC |
2230 | |
2231 | if (task) { | |
2232 | task->last_timeout = jiffies; | |
2233 | iscsi_put_task(task); | |
2234 | } | |
dee7121e | 2235 | ISCSI_DBG_EH(session, "return %s\n", rc == SCSI_EH_RESET_TIMER ? |
d7549412 | 2236 | "timer reset" : "shutdown or nh"); |
f6d5180c MC |
2237 | return rc; |
2238 | } | |
b6a05c82 | 2239 | EXPORT_SYMBOL_GPL(iscsi_eh_cmd_timed_out); |
f6d5180c | 2240 | |
2c4b9637 | 2241 | static void iscsi_check_transport_timeouts(struct timer_list *t) |
f6d5180c | 2242 | { |
2c4b9637 | 2243 | struct iscsi_conn *conn = from_timer(conn, t, transport_timer); |
f6d5180c | 2244 | struct iscsi_session *session = conn->session; |
4cf10435 | 2245 | unsigned long recv_timeout, next_timeout = 0, last_recv; |
f6d5180c | 2246 | |
659743b0 | 2247 | spin_lock(&session->frwd_lock); |
f6d5180c MC |
2248 | if (session->state != ISCSI_STATE_LOGGED_IN) |
2249 | goto done; | |
2250 | ||
4cf10435 MC |
2251 | recv_timeout = conn->recv_timeout; |
2252 | if (!recv_timeout) | |
f6d5180c MC |
2253 | goto done; |
2254 | ||
4cf10435 | 2255 | recv_timeout *= HZ; |
f6d5180c | 2256 | last_recv = conn->last_recv; |
4c48a829 MC |
2257 | |
2258 | if (iscsi_has_ping_timed_out(conn)) { | |
322d739d | 2259 | iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs " |
4c48a829 MC |
2260 | "expired, recv timeout %d, last rx %lu, " |
2261 | "last ping %lu, now %lu\n", | |
2262 | conn->ping_timeout, conn->recv_timeout, | |
2263 | last_recv, conn->last_ping, jiffies); | |
659743b0 | 2264 | spin_unlock(&session->frwd_lock); |
09ff742c | 2265 | iscsi_conn_failure(conn, ISCSI_ERR_NOP_TIMEDOUT); |
f6d5180c MC |
2266 | return; |
2267 | } | |
2268 | ||
4cf10435 | 2269 | if (time_before_eq(last_recv + recv_timeout, jiffies)) { |
c8611f97 | 2270 | /* send a ping to try to provoke some traffic */ |
1b2c7af8 | 2271 | ISCSI_DBG_CONN(conn, "Sending nopout as ping\n"); |
52f5664a AN |
2272 | if (iscsi_send_nopout(conn, NULL)) |
2273 | next_timeout = jiffies + (1 * HZ); | |
2274 | else | |
2275 | next_timeout = conn->last_ping + (conn->ping_timeout * HZ); | |
ad294e9c | 2276 | } else |
4cf10435 | 2277 | next_timeout = last_recv + recv_timeout; |
f6d5180c | 2278 | |
1b2c7af8 | 2279 | ISCSI_DBG_CONN(conn, "Setting next tmo %lu\n", next_timeout); |
ad294e9c | 2280 | mod_timer(&conn->transport_timer, next_timeout); |
f6d5180c | 2281 | done: |
659743b0 | 2282 | spin_unlock(&session->frwd_lock); |
f6d5180c MC |
2283 | } |
2284 | ||
891e2639 MC |
2285 | /** |
2286 | * iscsi_conn_unbind - prevent queueing to conn. | |
2287 | * @cls_conn: iscsi conn ep is bound to. | |
2288 | * @is_active: is the conn in use for boot or is this for EH/termination | |
2289 | * | |
2290 | * This must be called by drivers implementing the ep_disconnect callout. | |
2291 | * It disables queueing to the connection from libiscsi in preparation for | |
2292 | * an ep_disconnect call. | |
2293 | */ | |
2294 | void iscsi_conn_unbind(struct iscsi_cls_conn *cls_conn, bool is_active) | |
2295 | { | |
2296 | struct iscsi_session *session; | |
2297 | struct iscsi_conn *conn; | |
2298 | ||
2299 | if (!cls_conn) | |
2300 | return; | |
2301 | ||
2302 | conn = cls_conn->dd_data; | |
2303 | session = conn->session; | |
2304 | /* | |
2305 | * Wait for iscsi_eh calls to exit. We don't wait for the tmf to | |
2306 | * complete or timeout. The caller just wants to know what's running | |
2307 | * is everything that needs to be cleaned up, and no cmds will be | |
2308 | * queued. | |
2309 | */ | |
2310 | mutex_lock(&session->eh_mutex); | |
2311 | ||
2312 | iscsi_suspend_queue(conn); | |
2313 | iscsi_suspend_tx(conn); | |
2314 | ||
2315 | spin_lock_bh(&session->frwd_lock); | |
44ac9710 MC |
2316 | clear_bit(ISCSI_CONN_FLAG_BOUND, &conn->flags); |
2317 | ||
891e2639 MC |
2318 | if (!is_active) { |
2319 | /* | |
2320 | * if logout timed out before userspace could even send a PDU | |
2321 | * the state might still be in ISCSI_STATE_LOGGED_IN and | |
2322 | * allowing new cmds and TMFs. | |
2323 | */ | |
2324 | if (session->state == ISCSI_STATE_LOGGED_IN) | |
2325 | iscsi_set_conn_failed(conn); | |
2326 | } | |
2327 | spin_unlock_bh(&session->frwd_lock); | |
2328 | mutex_unlock(&session->eh_mutex); | |
2329 | } | |
2330 | EXPORT_SYMBOL_GPL(iscsi_conn_unbind); | |
2331 | ||
9c19a7d0 | 2332 | static void iscsi_prep_abort_task_pdu(struct iscsi_task *task, |
843c0a8a MC |
2333 | struct iscsi_tm *hdr) |
2334 | { | |
2335 | memset(hdr, 0, sizeof(*hdr)); | |
2336 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
2337 | hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK; | |
2338 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
55bdabdf | 2339 | hdr->lun = task->lun; |
577577da MC |
2340 | hdr->rtt = task->hdr_itt; |
2341 | hdr->refcmdsn = task->cmdsn; | |
843c0a8a MC |
2342 | } |
2343 | ||
7996a778 MC |
2344 | int iscsi_eh_abort(struct scsi_cmnd *sc) |
2345 | { | |
75613521 MC |
2346 | struct iscsi_cls_session *cls_session; |
2347 | struct iscsi_session *session; | |
f47f2cf5 | 2348 | struct iscsi_conn *conn; |
9c19a7d0 | 2349 | struct iscsi_task *task; |
843c0a8a | 2350 | struct iscsi_tm *hdr; |
e9e410e8 | 2351 | int age; |
7996a778 | 2352 | |
75613521 MC |
2353 | cls_session = starget_to_session(scsi_target(sc->device)); |
2354 | session = cls_session->dd_data; | |
2355 | ||
bd2199d4 | 2356 | ISCSI_DBG_EH(session, "aborting sc %p\n", sc); |
4421c9eb | 2357 | |
e1c6a7ec | 2358 | completion_check: |
6724add1 | 2359 | mutex_lock(&session->eh_mutex); |
659743b0 | 2360 | spin_lock_bh(&session->frwd_lock); |
f47f2cf5 MC |
2361 | /* |
2362 | * if session was ISCSI_STATE_IN_RECOVERY then we may not have | |
2363 | * got the command. | |
2364 | */ | |
db22de3e | 2365 | if (!iscsi_cmd(sc)->task) { |
bd2199d4 EZ |
2366 | ISCSI_DBG_EH(session, "sc never reached iscsi layer or " |
2367 | "it completed.\n"); | |
659743b0 | 2368 | spin_unlock_bh(&session->frwd_lock); |
6724add1 | 2369 | mutex_unlock(&session->eh_mutex); |
f47f2cf5 MC |
2370 | return SUCCESS; |
2371 | } | |
2372 | ||
7996a778 MC |
2373 | /* |
2374 | * If we are not logged in or we have started a new session | |
2375 | * then let the host reset code handle this | |
2376 | */ | |
843c0a8a | 2377 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN || |
db22de3e | 2378 | iscsi_cmd(sc)->age != session->age) { |
659743b0 | 2379 | spin_unlock_bh(&session->frwd_lock); |
843c0a8a | 2380 | mutex_unlock(&session->eh_mutex); |
bd2199d4 | 2381 | ISCSI_DBG_EH(session, "failing abort due to dropped " |
4421c9eb | 2382 | "session.\n"); |
843c0a8a MC |
2383 | return FAILED; |
2384 | } | |
2385 | ||
14936b1e | 2386 | spin_lock(&session->back_lock); |
db22de3e | 2387 | task = iscsi_cmd(sc)->task; |
14936b1e MC |
2388 | if (!task || !task->sc) { |
2389 | /* task completed before time out */ | |
bd2199d4 | 2390 | ISCSI_DBG_EH(session, "sc completed while abort in progress\n"); |
14936b1e MC |
2391 | |
2392 | spin_unlock(&session->back_lock); | |
258aad75 MC |
2393 | spin_unlock_bh(&session->frwd_lock); |
2394 | mutex_unlock(&session->eh_mutex); | |
2395 | return SUCCESS; | |
7ea8b828 | 2396 | } |
258aad75 | 2397 | |
e1c6a7ec MC |
2398 | if (!iscsi_get_task(task)) { |
2399 | spin_unlock(&session->back_lock); | |
2400 | spin_unlock_bh(&session->frwd_lock); | |
2401 | mutex_unlock(&session->eh_mutex); | |
2402 | /* We are just about to call iscsi_free_task so wait for it. */ | |
2403 | udelay(ISCSI_CMD_COMPL_WAIT); | |
2404 | goto completion_check; | |
2405 | } | |
2406 | ||
2407 | ISCSI_DBG_EH(session, "aborting [sc %p itt 0x%x]\n", sc, task->itt); | |
258aad75 MC |
2408 | conn = session->leadconn; |
2409 | iscsi_get_conn(conn->cls_conn); | |
2410 | conn->eh_abort_cnt++; | |
2411 | age = session->age; | |
14936b1e | 2412 | spin_unlock(&session->back_lock); |
7996a778 | 2413 | |
9c19a7d0 | 2414 | if (task->state == ISCSI_TASK_PENDING) { |
b3cd5050 | 2415 | fail_scsi_task(task, DID_ABORT); |
77a23c21 MC |
2416 | goto success; |
2417 | } | |
7996a778 | 2418 | |
843c0a8a | 2419 | /* only have one tmf outstanding at a time */ |
ec29d0ac | 2420 | if (session->tmf_state != TMF_INITIAL) |
7996a778 | 2421 | goto failed; |
ec29d0ac | 2422 | session->tmf_state = TMF_QUEUED; |
7996a778 | 2423 | |
ec29d0ac | 2424 | hdr = &session->tmhdr; |
9c19a7d0 | 2425 | iscsi_prep_abort_task_pdu(task, hdr); |
843c0a8a | 2426 | |
e9e410e8 | 2427 | if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout)) |
843c0a8a | 2428 | goto failed; |
843c0a8a | 2429 | |
ec29d0ac | 2430 | switch (session->tmf_state) { |
843c0a8a | 2431 | case TMF_SUCCESS: |
659743b0 | 2432 | spin_unlock_bh(&session->frwd_lock); |
913e5bf4 MC |
2433 | /* |
2434 | * stop tx side incase the target had sent a abort rsp but | |
2435 | * the initiator was still writing out data. | |
2436 | */ | |
6724add1 | 2437 | iscsi_suspend_tx(conn); |
77a23c21 | 2438 | /* |
913e5bf4 MC |
2439 | * we do not stop the recv side because targets have been |
2440 | * good and have never sent us a successful tmf response | |
2441 | * then sent more data for the cmd. | |
77a23c21 | 2442 | */ |
659743b0 | 2443 | spin_lock_bh(&session->frwd_lock); |
b3cd5050 | 2444 | fail_scsi_task(task, DID_ABORT); |
ec29d0ac | 2445 | session->tmf_state = TMF_INITIAL; |
5d12c05e | 2446 | memset(hdr, 0, sizeof(*hdr)); |
659743b0 | 2447 | spin_unlock_bh(&session->frwd_lock); |
6724add1 | 2448 | iscsi_start_tx(conn); |
77a23c21 | 2449 | goto success_unlocked; |
843c0a8a | 2450 | case TMF_TIMEDOUT: |
99b06033 | 2451 | session->running_aborted_task = task; |
659743b0 | 2452 | spin_unlock_bh(&session->frwd_lock); |
df4da5cd | 2453 | iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); |
843c0a8a MC |
2454 | goto failed_unlocked; |
2455 | case TMF_NOT_FOUND: | |
f6f96457 | 2456 | if (iscsi_task_is_completed(task)) { |
ec29d0ac | 2457 | session->tmf_state = TMF_INITIAL; |
5d12c05e | 2458 | memset(hdr, 0, sizeof(*hdr)); |
9c19a7d0 | 2459 | /* task completed before tmf abort response */ |
bd2199d4 EZ |
2460 | ISCSI_DBG_EH(session, "sc completed while abort in " |
2461 | "progress\n"); | |
77a23c21 | 2462 | goto success; |
7ea8b828 | 2463 | } |
df561f66 | 2464 | fallthrough; |
7ea8b828 | 2465 | default: |
ec29d0ac | 2466 | session->tmf_state = TMF_INITIAL; |
843c0a8a | 2467 | goto failed; |
7996a778 MC |
2468 | } |
2469 | ||
77a23c21 | 2470 | success: |
659743b0 | 2471 | spin_unlock_bh(&session->frwd_lock); |
77a23c21 | 2472 | success_unlocked: |
bd2199d4 EZ |
2473 | ISCSI_DBG_EH(session, "abort success [sc %p itt 0x%x]\n", |
2474 | sc, task->itt); | |
14936b1e | 2475 | iscsi_put_task(task); |
d39df158 | 2476 | iscsi_put_conn(conn->cls_conn); |
6724add1 | 2477 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
2478 | return SUCCESS; |
2479 | ||
2480 | failed: | |
659743b0 | 2481 | spin_unlock_bh(&session->frwd_lock); |
77a23c21 | 2482 | failed_unlocked: |
bd2199d4 EZ |
2483 | ISCSI_DBG_EH(session, "abort failed [sc %p itt 0x%x]\n", sc, |
2484 | task ? task->itt : 0); | |
99b06033 MC |
2485 | /* |
2486 | * The driver might be accessing the task so hold the ref. The conn | |
2487 | * stop cleanup will drop the ref after ep_disconnect so we know the | |
2488 | * driver's no longer touching the task. | |
2489 | */ | |
2490 | if (!session->running_aborted_task) | |
2491 | iscsi_put_task(task); | |
2492 | ||
d39df158 | 2493 | iscsi_put_conn(conn->cls_conn); |
6724add1 | 2494 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
2495 | return FAILED; |
2496 | } | |
2497 | EXPORT_SYMBOL_GPL(iscsi_eh_abort); | |
2498 | ||
843c0a8a MC |
2499 | static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr) |
2500 | { | |
2501 | memset(hdr, 0, sizeof(*hdr)); | |
2502 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
2503 | hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK; | |
2504 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
55bdabdf | 2505 | int_to_scsilun(sc->device->lun, &hdr->lun); |
f6d5180c | 2506 | hdr->rtt = RESERVED_ITT; |
843c0a8a MC |
2507 | } |
2508 | ||
2509 | int iscsi_eh_device_reset(struct scsi_cmnd *sc) | |
2510 | { | |
75613521 MC |
2511 | struct iscsi_cls_session *cls_session; |
2512 | struct iscsi_session *session; | |
843c0a8a MC |
2513 | struct iscsi_conn *conn; |
2514 | struct iscsi_tm *hdr; | |
2515 | int rc = FAILED; | |
2516 | ||
75613521 MC |
2517 | cls_session = starget_to_session(scsi_target(sc->device)); |
2518 | session = cls_session->dd_data; | |
2519 | ||
9cb78c16 HR |
2520 | ISCSI_DBG_EH(session, "LU Reset [sc %p lun %llu]\n", sc, |
2521 | sc->device->lun); | |
843c0a8a MC |
2522 | |
2523 | mutex_lock(&session->eh_mutex); | |
659743b0 | 2524 | spin_lock_bh(&session->frwd_lock); |
843c0a8a MC |
2525 | /* |
2526 | * Just check if we are not logged in. We cannot check for | |
2527 | * the phase because the reset could come from a ioctl. | |
2528 | */ | |
2529 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN) | |
2530 | goto unlock; | |
2531 | conn = session->leadconn; | |
2532 | ||
2533 | /* only have one tmf outstanding at a time */ | |
ec29d0ac | 2534 | if (session->tmf_state != TMF_INITIAL) |
843c0a8a | 2535 | goto unlock; |
ec29d0ac | 2536 | session->tmf_state = TMF_QUEUED; |
843c0a8a | 2537 | |
ec29d0ac | 2538 | hdr = &session->tmhdr; |
843c0a8a MC |
2539 | iscsi_prep_lun_reset_pdu(sc, hdr); |
2540 | ||
9c19a7d0 | 2541 | if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age, |
f6d5180c | 2542 | session->lu_reset_timeout)) { |
843c0a8a MC |
2543 | rc = FAILED; |
2544 | goto unlock; | |
2545 | } | |
2546 | ||
ec29d0ac | 2547 | switch (session->tmf_state) { |
843c0a8a MC |
2548 | case TMF_SUCCESS: |
2549 | break; | |
2550 | case TMF_TIMEDOUT: | |
659743b0 | 2551 | spin_unlock_bh(&session->frwd_lock); |
df4da5cd | 2552 | iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); |
843c0a8a MC |
2553 | goto done; |
2554 | default: | |
ec29d0ac | 2555 | session->tmf_state = TMF_INITIAL; |
843c0a8a MC |
2556 | goto unlock; |
2557 | } | |
2558 | ||
2559 | rc = SUCCESS; | |
659743b0 | 2560 | spin_unlock_bh(&session->frwd_lock); |
843c0a8a MC |
2561 | |
2562 | iscsi_suspend_tx(conn); | |
913e5bf4 | 2563 | |
659743b0 | 2564 | spin_lock_bh(&session->frwd_lock); |
5d12c05e | 2565 | memset(hdr, 0, sizeof(*hdr)); |
3bbaaad9 | 2566 | fail_scsi_tasks(conn, sc->device->lun, DID_ERROR); |
ec29d0ac | 2567 | session->tmf_state = TMF_INITIAL; |
659743b0 | 2568 | spin_unlock_bh(&session->frwd_lock); |
843c0a8a MC |
2569 | |
2570 | iscsi_start_tx(conn); | |
2571 | goto done; | |
2572 | ||
2573 | unlock: | |
659743b0 | 2574 | spin_unlock_bh(&session->frwd_lock); |
843c0a8a | 2575 | done: |
bd2199d4 EZ |
2576 | ISCSI_DBG_EH(session, "dev reset result = %s\n", |
2577 | rc == SUCCESS ? "SUCCESS" : "FAILED"); | |
843c0a8a MC |
2578 | mutex_unlock(&session->eh_mutex); |
2579 | return rc; | |
2580 | } | |
2581 | EXPORT_SYMBOL_GPL(iscsi_eh_device_reset); | |
2582 | ||
3fe5ae8b MC |
2583 | void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session) |
2584 | { | |
2585 | struct iscsi_session *session = cls_session->dd_data; | |
2586 | ||
659743b0 | 2587 | spin_lock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2588 | if (session->state != ISCSI_STATE_LOGGED_IN) { |
2589 | session->state = ISCSI_STATE_RECOVERY_FAILED; | |
ec29d0ac | 2590 | wake_up(&session->ehwait); |
3fe5ae8b | 2591 | } |
659743b0 | 2592 | spin_unlock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2593 | } |
2594 | EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout); | |
2595 | ||
2596 | /** | |
2597 | * iscsi_eh_session_reset - drop session and attempt relogin | |
2598 | * @sc: scsi command | |
2599 | * | |
2600 | * This function will wait for a relogin, session termination from | |
2601 | * userspace, or a recovery/replacement timeout. | |
2602 | */ | |
309ce156 | 2603 | int iscsi_eh_session_reset(struct scsi_cmnd *sc) |
3fe5ae8b MC |
2604 | { |
2605 | struct iscsi_cls_session *cls_session; | |
2606 | struct iscsi_session *session; | |
2607 | struct iscsi_conn *conn; | |
2608 | ||
2609 | cls_session = starget_to_session(scsi_target(sc->device)); | |
2610 | session = cls_session->dd_data; | |
3fe5ae8b MC |
2611 | |
2612 | mutex_lock(&session->eh_mutex); | |
659743b0 | 2613 | spin_lock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2614 | if (session->state == ISCSI_STATE_TERMINATE) { |
2615 | failed: | |
2616 | ISCSI_DBG_EH(session, | |
2617 | "failing session reset: Could not log back into " | |
5db6dd14 FH |
2618 | "%s [age %d]\n", session->targetname, |
2619 | session->age); | |
659743b0 | 2620 | spin_unlock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2621 | mutex_unlock(&session->eh_mutex); |
2622 | return FAILED; | |
2623 | } | |
2624 | ||
fda290c5 MC |
2625 | conn = session->leadconn; |
2626 | iscsi_get_conn(conn->cls_conn); | |
2627 | ||
659743b0 | 2628 | spin_unlock_bh(&session->frwd_lock); |
3fe5ae8b | 2629 | mutex_unlock(&session->eh_mutex); |
fda290c5 | 2630 | |
df4da5cd | 2631 | iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); |
fda290c5 | 2632 | iscsi_put_conn(conn->cls_conn); |
3fe5ae8b MC |
2633 | |
2634 | ISCSI_DBG_EH(session, "wait for relogin\n"); | |
ec29d0ac | 2635 | wait_event_interruptible(session->ehwait, |
3fe5ae8b MC |
2636 | session->state == ISCSI_STATE_TERMINATE || |
2637 | session->state == ISCSI_STATE_LOGGED_IN || | |
2638 | session->state == ISCSI_STATE_RECOVERY_FAILED); | |
2639 | if (signal_pending(current)) | |
2640 | flush_signals(current); | |
2641 | ||
2642 | mutex_lock(&session->eh_mutex); | |
659743b0 | 2643 | spin_lock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2644 | if (session->state == ISCSI_STATE_LOGGED_IN) { |
2645 | ISCSI_DBG_EH(session, | |
2646 | "session reset succeeded for %s,%s\n", | |
2647 | session->targetname, conn->persistent_address); | |
2648 | } else | |
2649 | goto failed; | |
659743b0 | 2650 | spin_unlock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2651 | mutex_unlock(&session->eh_mutex); |
2652 | return SUCCESS; | |
2653 | } | |
309ce156 | 2654 | EXPORT_SYMBOL_GPL(iscsi_eh_session_reset); |
3fe5ae8b MC |
2655 | |
2656 | static void iscsi_prep_tgt_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr) | |
2657 | { | |
2658 | memset(hdr, 0, sizeof(*hdr)); | |
2659 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
2660 | hdr->flags = ISCSI_TM_FUNC_TARGET_WARM_RESET & ISCSI_FLAG_TM_FUNC_MASK; | |
2661 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
2662 | hdr->rtt = RESERVED_ITT; | |
2663 | } | |
2664 | ||
2665 | /** | |
2666 | * iscsi_eh_target_reset - reset target | |
2667 | * @sc: scsi command | |
2668 | * | |
309ce156 | 2669 | * This will attempt to send a warm target reset. |
3fe5ae8b | 2670 | */ |
3907adf6 | 2671 | static int iscsi_eh_target_reset(struct scsi_cmnd *sc) |
3fe5ae8b MC |
2672 | { |
2673 | struct iscsi_cls_session *cls_session; | |
2674 | struct iscsi_session *session; | |
2675 | struct iscsi_conn *conn; | |
2676 | struct iscsi_tm *hdr; | |
2677 | int rc = FAILED; | |
2678 | ||
2679 | cls_session = starget_to_session(scsi_target(sc->device)); | |
2680 | session = cls_session->dd_data; | |
2681 | ||
2682 | ISCSI_DBG_EH(session, "tgt Reset [sc %p tgt %s]\n", sc, | |
2683 | session->targetname); | |
2684 | ||
2685 | mutex_lock(&session->eh_mutex); | |
659743b0 | 2686 | spin_lock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2687 | /* |
2688 | * Just check if we are not logged in. We cannot check for | |
2689 | * the phase because the reset could come from a ioctl. | |
2690 | */ | |
2691 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN) | |
2692 | goto unlock; | |
2693 | conn = session->leadconn; | |
2694 | ||
2695 | /* only have one tmf outstanding at a time */ | |
ec29d0ac | 2696 | if (session->tmf_state != TMF_INITIAL) |
3fe5ae8b | 2697 | goto unlock; |
ec29d0ac | 2698 | session->tmf_state = TMF_QUEUED; |
3fe5ae8b | 2699 | |
ec29d0ac | 2700 | hdr = &session->tmhdr; |
3fe5ae8b MC |
2701 | iscsi_prep_tgt_reset_pdu(sc, hdr); |
2702 | ||
2703 | if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age, | |
2704 | session->tgt_reset_timeout)) { | |
2705 | rc = FAILED; | |
2706 | goto unlock; | |
2707 | } | |
2708 | ||
ec29d0ac | 2709 | switch (session->tmf_state) { |
3fe5ae8b MC |
2710 | case TMF_SUCCESS: |
2711 | break; | |
2712 | case TMF_TIMEDOUT: | |
659743b0 | 2713 | spin_unlock_bh(&session->frwd_lock); |
df4da5cd | 2714 | iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); |
3fe5ae8b MC |
2715 | goto done; |
2716 | default: | |
ec29d0ac | 2717 | session->tmf_state = TMF_INITIAL; |
3fe5ae8b MC |
2718 | goto unlock; |
2719 | } | |
2720 | ||
2721 | rc = SUCCESS; | |
659743b0 | 2722 | spin_unlock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2723 | |
2724 | iscsi_suspend_tx(conn); | |
2725 | ||
659743b0 | 2726 | spin_lock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2727 | memset(hdr, 0, sizeof(*hdr)); |
2728 | fail_scsi_tasks(conn, -1, DID_ERROR); | |
ec29d0ac | 2729 | session->tmf_state = TMF_INITIAL; |
659743b0 | 2730 | spin_unlock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2731 | |
2732 | iscsi_start_tx(conn); | |
2733 | goto done; | |
2734 | ||
2735 | unlock: | |
659743b0 | 2736 | spin_unlock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2737 | done: |
2738 | ISCSI_DBG_EH(session, "tgt %s reset result = %s\n", session->targetname, | |
2739 | rc == SUCCESS ? "SUCCESS" : "FAILED"); | |
2740 | mutex_unlock(&session->eh_mutex); | |
309ce156 JK |
2741 | return rc; |
2742 | } | |
3fe5ae8b | 2743 | |
309ce156 JK |
2744 | /** |
2745 | * iscsi_eh_recover_target - reset target and possibly the session | |
2746 | * @sc: scsi command | |
2747 | * | |
2748 | * This will attempt to send a warm target reset. If that fails, | |
2749 | * we will escalate to ERL0 session recovery. | |
2750 | */ | |
2751 | int iscsi_eh_recover_target(struct scsi_cmnd *sc) | |
2752 | { | |
2753 | int rc; | |
2754 | ||
2755 | rc = iscsi_eh_target_reset(sc); | |
3fe5ae8b MC |
2756 | if (rc == FAILED) |
2757 | rc = iscsi_eh_session_reset(sc); | |
2758 | return rc; | |
2759 | } | |
309ce156 | 2760 | EXPORT_SYMBOL_GPL(iscsi_eh_recover_target); |
3fe5ae8b | 2761 | |
6320377f OK |
2762 | /* |
2763 | * Pre-allocate a pool of @max items of @item_size. By default, the pool | |
2764 | * should be accessed via kfifo_{get,put} on q->queue. | |
2765 | * Optionally, the caller can obtain the array of object pointers | |
2766 | * by passing in a non-NULL @items pointer | |
2767 | */ | |
7996a778 | 2768 | int |
6320377f | 2769 | iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size) |
7996a778 | 2770 | { |
6320377f | 2771 | int i, num_arrays = 1; |
7996a778 | 2772 | |
6320377f | 2773 | memset(q, 0, sizeof(*q)); |
7996a778 MC |
2774 | |
2775 | q->max = max; | |
6320377f OK |
2776 | |
2777 | /* If the user passed an items pointer, he wants a copy of | |
2778 | * the array. */ | |
2779 | if (items) | |
2780 | num_arrays++; | |
778e1cdd | 2781 | q->pool = kvcalloc(num_arrays * max, sizeof(void *), GFP_KERNEL); |
6320377f | 2782 | if (q->pool == NULL) |
f474a37b | 2783 | return -ENOMEM; |
7996a778 | 2784 | |
c1e13f25 | 2785 | kfifo_init(&q->queue, (void*)q->pool, max * sizeof(void*)); |
7996a778 MC |
2786 | |
2787 | for (i = 0; i < max; i++) { | |
6320377f | 2788 | q->pool[i] = kzalloc(item_size, GFP_KERNEL); |
7996a778 | 2789 | if (q->pool[i] == NULL) { |
6320377f OK |
2790 | q->max = i; |
2791 | goto enomem; | |
7996a778 | 2792 | } |
7acd72eb | 2793 | kfifo_in(&q->queue, (void*)&q->pool[i], sizeof(void*)); |
7996a778 | 2794 | } |
6320377f OK |
2795 | |
2796 | if (items) { | |
2797 | *items = q->pool + max; | |
2798 | memcpy(*items, q->pool, max * sizeof(void *)); | |
2799 | } | |
2800 | ||
7996a778 | 2801 | return 0; |
6320377f OK |
2802 | |
2803 | enomem: | |
2804 | iscsi_pool_free(q); | |
2805 | return -ENOMEM; | |
7996a778 MC |
2806 | } |
2807 | EXPORT_SYMBOL_GPL(iscsi_pool_init); | |
2808 | ||
6320377f | 2809 | void iscsi_pool_free(struct iscsi_pool *q) |
7996a778 MC |
2810 | { |
2811 | int i; | |
2812 | ||
2813 | for (i = 0; i < q->max; i++) | |
6320377f | 2814 | kfree(q->pool[i]); |
bfcc62ed | 2815 | kvfree(q->pool); |
7996a778 MC |
2816 | } |
2817 | EXPORT_SYMBOL_GPL(iscsi_pool_free); | |
2818 | ||
b4046922 MC |
2819 | int iscsi_host_get_max_scsi_cmds(struct Scsi_Host *shost, |
2820 | uint16_t requested_cmds_max) | |
2821 | { | |
2822 | int scsi_cmds, total_cmds = requested_cmds_max; | |
2823 | ||
2824 | check: | |
2825 | if (!total_cmds) | |
2826 | total_cmds = ISCSI_DEF_XMIT_CMDS_MAX; | |
2827 | /* | |
2828 | * The iscsi layer needs some tasks for nop handling and tmfs, | |
2829 | * so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX | |
2830 | * + 1 command for scsi IO. | |
2831 | */ | |
2832 | if (total_cmds < ISCSI_TOTAL_CMDS_MIN) { | |
2833 | printk(KERN_ERR "iscsi: invalid max cmds of %d. Must be a power of two that is at least %d.\n", | |
2834 | total_cmds, ISCSI_TOTAL_CMDS_MIN); | |
2835 | return -EINVAL; | |
2836 | } | |
2837 | ||
2838 | if (total_cmds > ISCSI_TOTAL_CMDS_MAX) { | |
2839 | printk(KERN_INFO "iscsi: invalid max cmds of %d. Must be a power of 2 less than or equal to %d. Using %d.\n", | |
2840 | requested_cmds_max, ISCSI_TOTAL_CMDS_MAX, | |
2841 | ISCSI_TOTAL_CMDS_MAX); | |
2842 | total_cmds = ISCSI_TOTAL_CMDS_MAX; | |
2843 | } | |
2844 | ||
2845 | if (!is_power_of_2(total_cmds)) { | |
2846 | total_cmds = rounddown_pow_of_two(total_cmds); | |
2847 | if (total_cmds < ISCSI_TOTAL_CMDS_MIN) { | |
2848 | printk(KERN_ERR "iscsi: invalid max cmds of %d. Must be a power of 2 greater than %d.\n", requested_cmds_max, ISCSI_TOTAL_CMDS_MIN); | |
2849 | return -EINVAL; | |
2850 | } | |
2851 | ||
2852 | printk(KERN_INFO "iscsi: invalid max cmds %d. Must be a power of 2. Rounding max cmds down to %d.\n", | |
2853 | requested_cmds_max, total_cmds); | |
2854 | } | |
2855 | ||
2856 | scsi_cmds = total_cmds - ISCSI_MGMT_CMDS_MAX; | |
2857 | if (shost->can_queue && scsi_cmds > shost->can_queue) { | |
2858 | total_cmds = shost->can_queue; | |
2859 | ||
2860 | printk(KERN_INFO "iscsi: requested max cmds %u is higher than driver limit. Using driver limit %u\n", | |
2861 | requested_cmds_max, shost->can_queue); | |
2862 | goto check; | |
2863 | } | |
2864 | ||
2865 | return scsi_cmds; | |
2866 | } | |
2867 | EXPORT_SYMBOL_GPL(iscsi_host_get_max_scsi_cmds); | |
2868 | ||
a4804cd6 MC |
2869 | /** |
2870 | * iscsi_host_add - add host to system | |
2871 | * @shost: scsi host | |
2872 | * @pdev: parent device | |
2873 | * | |
2874 | * This should be called by partial offload and software iscsi drivers | |
2875 | * to add a host to the system. | |
2876 | */ | |
2877 | int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev) | |
2878 | { | |
8e9a20ce MC |
2879 | if (!shost->can_queue) |
2880 | shost->can_queue = ISCSI_DEF_XMIT_CMDS_MAX; | |
2881 | ||
4d108350 MC |
2882 | if (!shost->cmd_per_lun) |
2883 | shost->cmd_per_lun = ISCSI_DEF_CMD_PER_LUN; | |
2884 | ||
a4804cd6 MC |
2885 | return scsi_add_host(shost, pdev); |
2886 | } | |
2887 | EXPORT_SYMBOL_GPL(iscsi_host_add); | |
2888 | ||
2889 | /** | |
2890 | * iscsi_host_alloc - allocate a host and driver data | |
2891 | * @sht: scsi host template | |
2892 | * @dd_data_size: driver host data size | |
32ae763e | 2893 | * @xmit_can_sleep: bool indicating if LLD will queue IO from a work queue |
a4804cd6 MC |
2894 | * |
2895 | * This should be called by partial offload and software iscsi drivers. | |
2896 | * To access the driver specific memory use the iscsi_host_priv() macro. | |
2897 | */ | |
80602aca | 2898 | struct Scsi_Host *iscsi_host_alloc(const struct scsi_host_template *sht, |
4d108350 | 2899 | int dd_data_size, bool xmit_can_sleep) |
75613521 | 2900 | { |
a4804cd6 | 2901 | struct Scsi_Host *shost; |
e5bd7b54 | 2902 | struct iscsi_host *ihost; |
a4804cd6 MC |
2903 | |
2904 | shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size); | |
2905 | if (!shost) | |
2906 | return NULL; | |
e5bd7b54 | 2907 | ihost = shost_priv(shost); |
32ae763e MC |
2908 | |
2909 | if (xmit_can_sleep) { | |
69af1c95 | 2910 | ihost->workq = alloc_workqueue("iscsi_q_%d", |
3ce41966 | 2911 | WQ_SYSFS | __WQ_LEGACY | WQ_MEM_RECLAIM | WQ_UNBOUND, |
69af1c95 | 2912 | 1, shost->host_no); |
32ae763e MC |
2913 | if (!ihost->workq) |
2914 | goto free_host; | |
2915 | } | |
2916 | ||
e5bd7b54 MC |
2917 | spin_lock_init(&ihost->lock); |
2918 | ihost->state = ISCSI_HOST_SETUP; | |
2919 | ihost->num_sessions = 0; | |
2920 | init_waitqueue_head(&ihost->session_removal_wq); | |
a4804cd6 | 2921 | return shost; |
32ae763e MC |
2922 | |
2923 | free_host: | |
2924 | scsi_host_put(shost); | |
2925 | return NULL; | |
a4804cd6 MC |
2926 | } |
2927 | EXPORT_SYMBOL_GPL(iscsi_host_alloc); | |
2928 | ||
e5bd7b54 MC |
2929 | static void iscsi_notify_host_removed(struct iscsi_cls_session *cls_session) |
2930 | { | |
40a06e75 | 2931 | iscsi_session_failure(cls_session->dd_data, ISCSI_ERR_INVALID_HOST); |
e5bd7b54 MC |
2932 | } |
2933 | ||
a4804cd6 MC |
2934 | /** |
2935 | * iscsi_host_remove - remove host and sessions | |
2936 | * @shost: scsi host | |
31500e90 | 2937 | * @is_shutdown: true if called from a driver shutdown callout |
a4804cd6 | 2938 | * |
e5bd7b54 MC |
2939 | * If there are any sessions left, this will initiate the removal and wait |
2940 | * for the completion. | |
a4804cd6 | 2941 | */ |
31500e90 | 2942 | void iscsi_host_remove(struct Scsi_Host *shost, bool is_shutdown) |
a4804cd6 | 2943 | { |
e5bd7b54 MC |
2944 | struct iscsi_host *ihost = shost_priv(shost); |
2945 | unsigned long flags; | |
2946 | ||
2947 | spin_lock_irqsave(&ihost->lock, flags); | |
2948 | ihost->state = ISCSI_HOST_REMOVED; | |
2949 | spin_unlock_irqrestore(&ihost->lock, flags); | |
2950 | ||
31500e90 MC |
2951 | if (!is_shutdown) |
2952 | iscsi_host_for_each_session(shost, iscsi_notify_host_removed); | |
2953 | else | |
2954 | iscsi_host_for_each_session(shost, iscsi_force_destroy_session); | |
2955 | ||
e5bd7b54 MC |
2956 | wait_event_interruptible(ihost->session_removal_wq, |
2957 | ihost->num_sessions == 0); | |
2958 | if (signal_pending(current)) | |
2959 | flush_signals(current); | |
2960 | ||
a4804cd6 | 2961 | scsi_remove_host(shost); |
75613521 | 2962 | } |
a4804cd6 | 2963 | EXPORT_SYMBOL_GPL(iscsi_host_remove); |
7996a778 | 2964 | |
a4804cd6 | 2965 | void iscsi_host_free(struct Scsi_Host *shost) |
75613521 MC |
2966 | { |
2967 | struct iscsi_host *ihost = shost_priv(shost); | |
7996a778 | 2968 | |
c435f0a9 MC |
2969 | if (ihost->workq) |
2970 | destroy_workqueue(ihost->workq); | |
2971 | ||
75613521 MC |
2972 | kfree(ihost->netdev); |
2973 | kfree(ihost->hwaddress); | |
2974 | kfree(ihost->initiatorname); | |
a4804cd6 | 2975 | scsi_host_put(shost); |
75613521 | 2976 | } |
a4804cd6 | 2977 | EXPORT_SYMBOL_GPL(iscsi_host_free); |
7996a778 | 2978 | |
e5bd7b54 MC |
2979 | static void iscsi_host_dec_session_cnt(struct Scsi_Host *shost) |
2980 | { | |
2981 | struct iscsi_host *ihost = shost_priv(shost); | |
2982 | unsigned long flags; | |
2983 | ||
2984 | shost = scsi_host_get(shost); | |
2985 | if (!shost) { | |
2986 | printk(KERN_ERR "Invalid state. Cannot notify host removal " | |
2987 | "of session teardown event because host already " | |
2988 | "removed.\n"); | |
2989 | return; | |
2990 | } | |
2991 | ||
2992 | spin_lock_irqsave(&ihost->lock, flags); | |
2993 | ihost->num_sessions--; | |
2994 | if (ihost->num_sessions == 0) | |
2995 | wake_up(&ihost->session_removal_wq); | |
2996 | spin_unlock_irqrestore(&ihost->lock, flags); | |
2997 | scsi_host_put(shost); | |
2998 | } | |
2999 | ||
7996a778 MC |
3000 | /** |
3001 | * iscsi_session_setup - create iscsi cls session and host and session | |
7996a778 | 3002 | * @iscsit: iscsi transport template |
75613521 MC |
3003 | * @shost: scsi host |
3004 | * @cmds_max: session can queue | |
ccd4a430 | 3005 | * @dd_size: private driver data size, added to session allocation size |
9c19a7d0 | 3006 | * @cmd_task_size: LLD task private data size |
7996a778 | 3007 | * @initial_cmdsn: initial CmdSN |
ccd4a430 | 3008 | * @id: target ID to add to this session |
7996a778 MC |
3009 | * |
3010 | * This can be used by software iscsi_transports that allocate | |
3011 | * a session per scsi host. | |
3cf7b233 MC |
3012 | * |
3013 | * Callers should set cmds_max to the largest total numer (mgmt + scsi) of | |
3014 | * tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks | |
3015 | * for nop handling and login/logout requests. | |
75613521 | 3016 | */ |
7996a778 | 3017 | struct iscsi_cls_session * |
75613521 | 3018 | iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost, |
b8b9e1b8 | 3019 | uint16_t cmds_max, int dd_size, int cmd_task_size, |
7970634b | 3020 | uint32_t initial_cmdsn, unsigned int id) |
7996a778 | 3021 | { |
e5bd7b54 | 3022 | struct iscsi_host *ihost = shost_priv(shost); |
7996a778 MC |
3023 | struct iscsi_session *session; |
3024 | struct iscsi_cls_session *cls_session; | |
b4046922 | 3025 | int cmd_i, scsi_cmds; |
e5bd7b54 MC |
3026 | unsigned long flags; |
3027 | ||
3028 | spin_lock_irqsave(&ihost->lock, flags); | |
3029 | if (ihost->state == ISCSI_HOST_REMOVED) { | |
3030 | spin_unlock_irqrestore(&ihost->lock, flags); | |
3031 | return NULL; | |
3032 | } | |
3033 | ihost->num_sessions++; | |
3034 | spin_unlock_irqrestore(&ihost->lock, flags); | |
8e9a20ce | 3035 | |
b4046922 MC |
3036 | scsi_cmds = iscsi_host_get_max_scsi_cmds(shost, cmds_max); |
3037 | if (scsi_cmds < 0) | |
e5bd7b54 | 3038 | goto dec_session_count; |
1548271e | 3039 | |
5d91e209 | 3040 | cls_session = iscsi_alloc_session(shost, iscsit, |
b8b9e1b8 JK |
3041 | sizeof(struct iscsi_session) + |
3042 | dd_size); | |
75613521 | 3043 | if (!cls_session) |
e5bd7b54 | 3044 | goto dec_session_count; |
75613521 MC |
3045 | session = cls_session->dd_data; |
3046 | session->cls_session = cls_session; | |
7996a778 MC |
3047 | session->host = shost; |
3048 | session->state = ISCSI_STATE_FREE; | |
f6d5180c | 3049 | session->fast_abort = 1; |
3fe5ae8b | 3050 | session->tgt_reset_timeout = 30; |
4cd49ea1 MC |
3051 | session->lu_reset_timeout = 15; |
3052 | session->abort_timeout = 10; | |
3cf7b233 | 3053 | session->scsi_cmds_max = scsi_cmds; |
b4046922 | 3054 | session->cmds_max = scsi_cmds + ISCSI_MGMT_CMDS_MAX; |
e0726407 | 3055 | session->queued_cmdsn = session->cmdsn = initial_cmdsn; |
7996a778 MC |
3056 | session->exp_cmdsn = initial_cmdsn + 1; |
3057 | session->max_cmdsn = initial_cmdsn + 1; | |
3058 | session->max_r2t = 1; | |
3059 | session->tt = iscsit; | |
b8b9e1b8 | 3060 | session->dd_data = cls_session->dd_data + sizeof(*session); |
659743b0 | 3061 | |
ec29d0ac MC |
3062 | session->tmf_state = TMF_INITIAL; |
3063 | timer_setup(&session->tmf_timer, iscsi_tmf_timedout, 0); | |
6724add1 | 3064 | mutex_init(&session->eh_mutex); |
e018f03d | 3065 | init_waitqueue_head(&session->ehwait); |
ec29d0ac | 3066 | |
659743b0 SP |
3067 | spin_lock_init(&session->frwd_lock); |
3068 | spin_lock_init(&session->back_lock); | |
7996a778 MC |
3069 | |
3070 | /* initialize SCSI PDU commands pool */ | |
3071 | if (iscsi_pool_init(&session->cmdpool, session->cmds_max, | |
3072 | (void***)&session->cmds, | |
9c19a7d0 | 3073 | cmd_task_size + sizeof(struct iscsi_task))) |
7996a778 MC |
3074 | goto cmdpool_alloc_fail; |
3075 | ||
3076 | /* pre-format cmds pool with ITT */ | |
3077 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
9c19a7d0 | 3078 | struct iscsi_task *task = session->cmds[cmd_i]; |
7996a778 | 3079 | |
9c19a7d0 MC |
3080 | if (cmd_task_size) |
3081 | task->dd_data = &task[1]; | |
3082 | task->itt = cmd_i; | |
3bbaaad9 | 3083 | task->state = ISCSI_TASK_FREE; |
9c19a7d0 | 3084 | INIT_LIST_HEAD(&task->running); |
7996a778 MC |
3085 | } |
3086 | ||
f53a88da | 3087 | if (!try_module_get(iscsit->owner)) |
75613521 | 3088 | goto module_get_fail; |
7996a778 | 3089 | |
7970634b | 3090 | if (iscsi_add_session(cls_session, id)) |
75613521 | 3091 | goto cls_session_fail; |
e5bd7b54 | 3092 | |
7996a778 MC |
3093 | return cls_session; |
3094 | ||
3095 | cls_session_fail: | |
75613521 MC |
3096 | module_put(iscsit->owner); |
3097 | module_get_fail: | |
6320377f | 3098 | iscsi_pool_free(&session->cmdpool); |
7996a778 | 3099 | cmdpool_alloc_fail: |
75613521 | 3100 | iscsi_free_session(cls_session); |
e5bd7b54 MC |
3101 | dec_session_count: |
3102 | iscsi_host_dec_session_cnt(shost); | |
7996a778 MC |
3103 | return NULL; |
3104 | } | |
3105 | EXPORT_SYMBOL_GPL(iscsi_session_setup); | |
3106 | ||
6f1d64b1 MC |
3107 | /* |
3108 | * issi_session_remove - Remove session from iSCSI class. | |
75613521 | 3109 | */ |
6f1d64b1 | 3110 | void iscsi_session_remove(struct iscsi_cls_session *cls_session) |
7996a778 | 3111 | { |
75613521 | 3112 | struct iscsi_session *session = cls_session->dd_data; |
e5bd7b54 | 3113 | struct Scsi_Host *shost = session->host; |
7996a778 | 3114 | |
9e10b512 | 3115 | iscsi_remove_session(cls_session); |
6f1d64b1 MC |
3116 | /* |
3117 | * host removal only has to wait for its children to be removed from | |
3118 | * sysfs, and iscsi_tcp needs to do iscsi_host_remove before freeing | |
3119 | * the session, so drop the session count here. | |
3120 | */ | |
3121 | iscsi_host_dec_session_cnt(shost); | |
3122 | } | |
3123 | EXPORT_SYMBOL_GPL(iscsi_session_remove); | |
3124 | ||
3125 | /** | |
3126 | * iscsi_session_free - Free iscsi session and it's resources | |
3127 | * @cls_session: iscsi session | |
3128 | */ | |
3129 | void iscsi_session_free(struct iscsi_cls_session *cls_session) | |
3130 | { | |
3131 | struct iscsi_session *session = cls_session->dd_data; | |
3132 | struct module *owner = cls_session->transport->owner; | |
9e10b512 | 3133 | |
a1f3486b | 3134 | iscsi_pool_free(&session->cmdpool); |
b2c64167 MC |
3135 | kfree(session->password); |
3136 | kfree(session->password_in); | |
3137 | kfree(session->username); | |
3138 | kfree(session->username_in); | |
f3ff0c36 | 3139 | kfree(session->targetname); |
3c5c4801 | 3140 | kfree(session->targetalias); |
88dfd340 | 3141 | kfree(session->initiatorname); |
3b9373e9 EW |
3142 | kfree(session->boot_root); |
3143 | kfree(session->boot_nic); | |
3144 | kfree(session->boot_target); | |
88dfd340 | 3145 | kfree(session->ifacename); |
f8525eb4 AC |
3146 | kfree(session->portal_type); |
3147 | kfree(session->discovery_parent_type); | |
f3ff0c36 | 3148 | |
9e10b512 | 3149 | iscsi_free_session(cls_session); |
63f75cc8 | 3150 | module_put(owner); |
7996a778 | 3151 | } |
6f1d64b1 MC |
3152 | EXPORT_SYMBOL_GPL(iscsi_session_free); |
3153 | ||
3154 | /** | |
3155 | * iscsi_session_teardown - destroy session and cls_session | |
3156 | * @cls_session: iscsi session | |
3157 | */ | |
3158 | void iscsi_session_teardown(struct iscsi_cls_session *cls_session) | |
3159 | { | |
3160 | iscsi_session_remove(cls_session); | |
3161 | iscsi_session_free(cls_session); | |
3162 | } | |
7996a778 MC |
3163 | EXPORT_SYMBOL_GPL(iscsi_session_teardown); |
3164 | ||
3165 | /** | |
3166 | * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn | |
3167 | * @cls_session: iscsi_cls_session | |
5d91e209 | 3168 | * @dd_size: private driver data size |
7996a778 | 3169 | * @conn_idx: cid |
5d91e209 | 3170 | */ |
7996a778 | 3171 | struct iscsi_cls_conn * |
5d91e209 MC |
3172 | iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size, |
3173 | uint32_t conn_idx) | |
7996a778 | 3174 | { |
75613521 | 3175 | struct iscsi_session *session = cls_session->dd_data; |
7996a778 MC |
3176 | struct iscsi_conn *conn; |
3177 | struct iscsi_cls_conn *cls_conn; | |
d36ab6f3 | 3178 | char *data; |
7dae459f | 3179 | int err; |
7996a778 | 3180 | |
7dae459f | 3181 | cls_conn = iscsi_alloc_conn(cls_session, sizeof(*conn) + dd_size, |
5d91e209 | 3182 | conn_idx); |
7996a778 MC |
3183 | if (!cls_conn) |
3184 | return NULL; | |
3185 | conn = cls_conn->dd_data; | |
7996a778 | 3186 | |
5d91e209 | 3187 | conn->dd_data = cls_conn->dd_data + sizeof(*conn); |
7996a778 MC |
3188 | conn->session = session; |
3189 | conn->cls_conn = cls_conn; | |
3190 | conn->c_stage = ISCSI_CONN_INITIAL_STAGE; | |
3191 | conn->id = conn_idx; | |
3192 | conn->exp_statsn = 0; | |
f6d5180c | 3193 | |
2c4b9637 | 3194 | timer_setup(&conn->transport_timer, iscsi_check_transport_timeouts, 0); |
f6d5180c | 3195 | |
843c0a8a | 3196 | INIT_LIST_HEAD(&conn->mgmtqueue); |
3bbaaad9 | 3197 | INIT_LIST_HEAD(&conn->cmdqueue); |
843c0a8a | 3198 | INIT_LIST_HEAD(&conn->requeue); |
c4028958 | 3199 | INIT_WORK(&conn->xmitwork, iscsi_xmitworker); |
7996a778 | 3200 | |
9c19a7d0 | 3201 | /* allocate login_task used for the login/text sequences */ |
659743b0 | 3202 | spin_lock_bh(&session->frwd_lock); |
7acd72eb | 3203 | if (!kfifo_out(&session->cmdpool.queue, |
9c19a7d0 | 3204 | (void*)&conn->login_task, |
7996a778 | 3205 | sizeof(void*))) { |
659743b0 | 3206 | spin_unlock_bh(&session->frwd_lock); |
9c19a7d0 | 3207 | goto login_task_alloc_fail; |
7996a778 | 3208 | } |
659743b0 | 3209 | spin_unlock_bh(&session->frwd_lock); |
7996a778 | 3210 | |
cfeb2cf9 MC |
3211 | data = (char *) __get_free_pages(GFP_KERNEL, |
3212 | get_order(ISCSI_DEF_MAX_RECV_SEG_LEN)); | |
d36ab6f3 | 3213 | if (!data) |
9c19a7d0 MC |
3214 | goto login_task_data_alloc_fail; |
3215 | conn->login_task->data = conn->data = data; | |
d36ab6f3 | 3216 | |
7dae459f WH |
3217 | err = iscsi_add_conn(cls_conn); |
3218 | if (err) | |
3219 | goto login_task_add_dev_fail; | |
3220 | ||
7996a778 MC |
3221 | return cls_conn; |
3222 | ||
7dae459f WH |
3223 | login_task_add_dev_fail: |
3224 | free_pages((unsigned long) conn->data, | |
3225 | get_order(ISCSI_DEF_MAX_RECV_SEG_LEN)); | |
3226 | ||
9c19a7d0 | 3227 | login_task_data_alloc_fail: |
7acd72eb | 3228 | kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task, |
d36ab6f3 | 3229 | sizeof(void*)); |
9c19a7d0 | 3230 | login_task_alloc_fail: |
7dae459f | 3231 | iscsi_put_conn(cls_conn); |
7996a778 MC |
3232 | return NULL; |
3233 | } | |
3234 | EXPORT_SYMBOL_GPL(iscsi_conn_setup); | |
3235 | ||
3236 | /** | |
3237 | * iscsi_conn_teardown - teardown iscsi connection | |
ccd4a430 | 3238 | * @cls_conn: iscsi class connection |
7996a778 MC |
3239 | * |
3240 | * TODO: we may need to make this into a two step process | |
3241 | * like scsi-mls remove + put host | |
3242 | */ | |
3243 | void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn) | |
3244 | { | |
3245 | struct iscsi_conn *conn = cls_conn->dd_data; | |
3246 | struct iscsi_session *session = conn->session; | |
8709c323 WH |
3247 | |
3248 | iscsi_remove_conn(cls_conn); | |
7996a778 | 3249 | |
f6d5180c MC |
3250 | del_timer_sync(&conn->transport_timer); |
3251 | ||
660d0831 | 3252 | mutex_lock(&session->eh_mutex); |
659743b0 | 3253 | spin_lock_bh(&session->frwd_lock); |
7996a778 MC |
3254 | conn->c_stage = ISCSI_CONN_CLEANUP_WAIT; |
3255 | if (session->leadconn == conn) { | |
3256 | /* | |
3257 | * leading connection? then give up on recovery. | |
3258 | */ | |
3259 | session->state = ISCSI_STATE_TERMINATE; | |
ec29d0ac | 3260 | wake_up(&session->ehwait); |
7996a778 | 3261 | } |
659743b0 | 3262 | spin_unlock_bh(&session->frwd_lock); |
7996a778 | 3263 | |
779ea120 | 3264 | /* flush queued up work because we free the connection below */ |
843c0a8a | 3265 | iscsi_suspend_tx(conn); |
779ea120 | 3266 | |
659743b0 | 3267 | spin_lock_bh(&session->frwd_lock); |
cfeb2cf9 MC |
3268 | free_pages((unsigned long) conn->data, |
3269 | get_order(ISCSI_DEF_MAX_RECV_SEG_LEN)); | |
8709c323 WH |
3270 | kfree(conn->persistent_address); |
3271 | kfree(conn->local_ipaddr); | |
659743b0 SP |
3272 | /* regular RX path uses back_lock */ |
3273 | spin_lock_bh(&session->back_lock); | |
7acd72eb | 3274 | kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task, |
7996a778 | 3275 | sizeof(void*)); |
659743b0 | 3276 | spin_unlock_bh(&session->back_lock); |
e0726407 | 3277 | if (session->leadconn == conn) |
7996a778 | 3278 | session->leadconn = NULL; |
659743b0 | 3279 | spin_unlock_bh(&session->frwd_lock); |
660d0831 | 3280 | mutex_unlock(&session->eh_mutex); |
7996a778 | 3281 | |
8709c323 | 3282 | iscsi_put_conn(cls_conn); |
7996a778 MC |
3283 | } |
3284 | EXPORT_SYMBOL_GPL(iscsi_conn_teardown); | |
3285 | ||
3286 | int iscsi_conn_start(struct iscsi_cls_conn *cls_conn) | |
3287 | { | |
3288 | struct iscsi_conn *conn = cls_conn->dd_data; | |
3289 | struct iscsi_session *session = conn->session; | |
3290 | ||
ffd0436e | 3291 | if (!session) { |
322d739d MC |
3292 | iscsi_conn_printk(KERN_ERR, conn, |
3293 | "can't start unbound connection\n"); | |
7996a778 MC |
3294 | return -EPERM; |
3295 | } | |
3296 | ||
db98ccde MC |
3297 | if ((session->imm_data_en || !session->initial_r2t_en) && |
3298 | session->first_burst > session->max_burst) { | |
322d739d MC |
3299 | iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: " |
3300 | "first_burst %d max_burst %d\n", | |
3301 | session->first_burst, session->max_burst); | |
ffd0436e MC |
3302 | return -EINVAL; |
3303 | } | |
3304 | ||
f6d5180c | 3305 | if (conn->ping_timeout && !conn->recv_timeout) { |
322d739d MC |
3306 | iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of " |
3307 | "zero. Using 5 seconds\n."); | |
f6d5180c MC |
3308 | conn->recv_timeout = 5; |
3309 | } | |
3310 | ||
3311 | if (conn->recv_timeout && !conn->ping_timeout) { | |
322d739d MC |
3312 | iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of " |
3313 | "zero. Using 5 seconds.\n"); | |
f6d5180c MC |
3314 | conn->ping_timeout = 5; |
3315 | } | |
3316 | ||
659743b0 | 3317 | spin_lock_bh(&session->frwd_lock); |
7996a778 MC |
3318 | conn->c_stage = ISCSI_CONN_STARTED; |
3319 | session->state = ISCSI_STATE_LOGGED_IN; | |
e0726407 | 3320 | session->queued_cmdsn = session->cmdsn; |
7996a778 | 3321 | |
f6d5180c MC |
3322 | conn->last_recv = jiffies; |
3323 | conn->last_ping = jiffies; | |
3324 | if (conn->recv_timeout && conn->ping_timeout) | |
3325 | mod_timer(&conn->transport_timer, | |
3326 | jiffies + (conn->recv_timeout * HZ)); | |
3327 | ||
7996a778 MC |
3328 | switch(conn->stop_stage) { |
3329 | case STOP_CONN_RECOVER: | |
3330 | /* | |
3331 | * unblock eh_abort() if it is blocked. re-try all | |
3332 | * commands after successful recovery | |
3333 | */ | |
7996a778 | 3334 | conn->stop_stage = 0; |
ec29d0ac | 3335 | session->tmf_state = TMF_INITIAL; |
7996a778 | 3336 | session->age++; |
8b1d0343 MC |
3337 | if (session->age == 16) |
3338 | session->age = 0; | |
6eabafbe | 3339 | break; |
7996a778 | 3340 | case STOP_CONN_TERM: |
7996a778 | 3341 | conn->stop_stage = 0; |
7996a778 MC |
3342 | break; |
3343 | default: | |
3344 | break; | |
3345 | } | |
659743b0 | 3346 | spin_unlock_bh(&session->frwd_lock); |
7996a778 | 3347 | |
75613521 | 3348 | iscsi_unblock_session(session->cls_session); |
ec29d0ac | 3349 | wake_up(&session->ehwait); |
7996a778 MC |
3350 | return 0; |
3351 | } | |
3352 | EXPORT_SYMBOL_GPL(iscsi_conn_start); | |
3353 | ||
3354 | static void | |
3bbaaad9 | 3355 | fail_mgmt_tasks(struct iscsi_session *session, struct iscsi_conn *conn) |
7996a778 | 3356 | { |
3bbaaad9 | 3357 | struct iscsi_task *task; |
b3cd5050 | 3358 | int i, state; |
7996a778 | 3359 | |
3bbaaad9 MC |
3360 | for (i = 0; i < conn->session->cmds_max; i++) { |
3361 | task = conn->session->cmds[i]; | |
3362 | if (task->sc) | |
3363 | continue; | |
7996a778 | 3364 | |
3bbaaad9 MC |
3365 | if (task->state == ISCSI_TASK_FREE) |
3366 | continue; | |
7996a778 | 3367 | |
3bbaaad9 MC |
3368 | ISCSI_DBG_SESSION(conn->session, |
3369 | "failing mgmt itt 0x%x state %d\n", | |
3370 | task->itt, task->state); | |
5923d64b MC |
3371 | |
3372 | spin_lock_bh(&session->back_lock); | |
3373 | if (cleanup_queued_task(task)) { | |
3374 | spin_unlock_bh(&session->back_lock); | |
3375 | continue; | |
3376 | } | |
3377 | ||
b3cd5050 MC |
3378 | state = ISCSI_TASK_ABRT_SESS_RECOV; |
3379 | if (task->state == ISCSI_TASK_PENDING) | |
3380 | state = ISCSI_TASK_COMPLETED; | |
3381 | iscsi_complete_task(task, state); | |
a656183e | 3382 | spin_unlock_bh(&session->back_lock); |
3bbaaad9 | 3383 | } |
7996a778 MC |
3384 | } |
3385 | ||
0dcf8feb | 3386 | void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) |
7996a778 | 3387 | { |
0dcf8feb MC |
3388 | struct iscsi_conn *conn = cls_conn->dd_data; |
3389 | struct iscsi_session *session = conn->session; | |
ed2abc7f MC |
3390 | int old_stop_stage; |
3391 | ||
6724add1 | 3392 | mutex_lock(&session->eh_mutex); |
659743b0 | 3393 | spin_lock_bh(&session->frwd_lock); |
ed2abc7f | 3394 | if (conn->stop_stage == STOP_CONN_TERM) { |
659743b0 | 3395 | spin_unlock_bh(&session->frwd_lock); |
6724add1 MC |
3396 | mutex_unlock(&session->eh_mutex); |
3397 | return; | |
3398 | } | |
3399 | ||
ed2abc7f MC |
3400 | /* |
3401 | * When this is called for the in_login state, we only want to clean | |
9c19a7d0 | 3402 | * up the login task and connection. We do not need to block and set |
67a61114 | 3403 | * the recovery state again |
ed2abc7f | 3404 | */ |
67a61114 MC |
3405 | if (flag == STOP_CONN_TERM) |
3406 | session->state = ISCSI_STATE_TERMINATE; | |
3407 | else if (conn->stop_stage != STOP_CONN_RECOVER) | |
3408 | session->state = ISCSI_STATE_IN_RECOVERY; | |
4ae0a6c1 MC |
3409 | |
3410 | old_stop_stage = conn->stop_stage; | |
3411 | conn->stop_stage = flag; | |
659743b0 | 3412 | spin_unlock_bh(&session->frwd_lock); |
ed2abc7f | 3413 | |
26013ad4 MC |
3414 | del_timer_sync(&conn->transport_timer); |
3415 | iscsi_suspend_tx(conn); | |
3416 | ||
659743b0 | 3417 | spin_lock_bh(&session->frwd_lock); |
67a61114 | 3418 | conn->c_stage = ISCSI_CONN_STOPPED; |
659743b0 | 3419 | spin_unlock_bh(&session->frwd_lock); |
6724add1 | 3420 | |
7996a778 MC |
3421 | /* |
3422 | * for connection level recovery we should not calculate | |
3423 | * header digest. conn->hdr_size used for optimization | |
3424 | * in hdr_extract() and will be re-negotiated at | |
3425 | * set_param() time. | |
3426 | */ | |
3427 | if (flag == STOP_CONN_RECOVER) { | |
3428 | conn->hdrdgst_en = 0; | |
3429 | conn->datadgst_en = 0; | |
656cffc9 | 3430 | if (session->state == ISCSI_STATE_IN_RECOVERY && |
67a61114 | 3431 | old_stop_stage != STOP_CONN_RECOVER) { |
1b2c7af8 | 3432 | ISCSI_DBG_SESSION(session, "blocking session\n"); |
75613521 | 3433 | iscsi_block_session(session->cls_session); |
67a61114 | 3434 | } |
7996a778 | 3435 | } |
656cffc9 | 3436 | |
656cffc9 MC |
3437 | /* |
3438 | * flush queues. | |
3439 | */ | |
659743b0 | 3440 | spin_lock_bh(&session->frwd_lock); |
b3cd5050 | 3441 | fail_scsi_tasks(conn, -1, DID_TRANSPORT_DISRUPTED); |
3bbaaad9 | 3442 | fail_mgmt_tasks(session, conn); |
ec29d0ac | 3443 | memset(&session->tmhdr, 0, sizeof(session->tmhdr)); |
659743b0 | 3444 | spin_unlock_bh(&session->frwd_lock); |
6724add1 | 3445 | mutex_unlock(&session->eh_mutex); |
7996a778 | 3446 | } |
7996a778 MC |
3447 | EXPORT_SYMBOL_GPL(iscsi_conn_stop); |
3448 | ||
3449 | int iscsi_conn_bind(struct iscsi_cls_session *cls_session, | |
3450 | struct iscsi_cls_conn *cls_conn, int is_leading) | |
3451 | { | |
75613521 | 3452 | struct iscsi_session *session = cls_session->dd_data; |
98644047 | 3453 | struct iscsi_conn *conn = cls_conn->dd_data; |
7996a778 | 3454 | |
659743b0 | 3455 | spin_lock_bh(&session->frwd_lock); |
7996a778 MC |
3456 | if (is_leading) |
3457 | session->leadconn = conn; | |
44ac9710 MC |
3458 | |
3459 | set_bit(ISCSI_CONN_FLAG_BOUND, &conn->flags); | |
659743b0 | 3460 | spin_unlock_bh(&session->frwd_lock); |
7996a778 | 3461 | |
c8447e4c MC |
3462 | /* |
3463 | * The target could have reduced it's window size between logins, so | |
3464 | * we have to reset max/exp cmdsn so we can see the new values. | |
3465 | */ | |
3466 | spin_lock_bh(&session->back_lock); | |
3467 | session->max_cmdsn = session->exp_cmdsn = session->cmdsn + 1; | |
3468 | spin_unlock_bh(&session->back_lock); | |
7996a778 MC |
3469 | /* |
3470 | * Unblock xmitworker(), Login Phase will pass through. | |
3471 | */ | |
5bd85625 MC |
3472 | clear_bit(ISCSI_CONN_FLAG_SUSPEND_RX, &conn->flags); |
3473 | clear_bit(ISCSI_CONN_FLAG_SUSPEND_TX, &conn->flags); | |
7996a778 MC |
3474 | return 0; |
3475 | } | |
3476 | EXPORT_SYMBOL_GPL(iscsi_conn_bind); | |
3477 | ||
adaf6990 | 3478 | int iscsi_switch_str_param(char **param, char *new_val_buf) |
5700b1af MC |
3479 | { |
3480 | char *new_val; | |
3481 | ||
3482 | if (*param) { | |
3483 | if (!strcmp(*param, new_val_buf)) | |
3484 | return 0; | |
3485 | } | |
3486 | ||
3487 | new_val = kstrdup(new_val_buf, GFP_NOIO); | |
3488 | if (!new_val) | |
3489 | return -ENOMEM; | |
3490 | ||
3491 | kfree(*param); | |
3492 | *param = new_val; | |
3493 | return 0; | |
3494 | } | |
adaf6990 | 3495 | EXPORT_SYMBOL_GPL(iscsi_switch_str_param); |
a54a52ca MC |
3496 | |
3497 | int iscsi_set_param(struct iscsi_cls_conn *cls_conn, | |
3498 | enum iscsi_param param, char *buf, int buflen) | |
3499 | { | |
3500 | struct iscsi_conn *conn = cls_conn->dd_data; | |
3501 | struct iscsi_session *session = conn->session; | |
6a06a4b8 | 3502 | int val; |
a54a52ca MC |
3503 | |
3504 | switch(param) { | |
843c0a8a MC |
3505 | case ISCSI_PARAM_FAST_ABORT: |
3506 | sscanf(buf, "%d", &session->fast_abort); | |
3507 | break; | |
f6d5180c MC |
3508 | case ISCSI_PARAM_ABORT_TMO: |
3509 | sscanf(buf, "%d", &session->abort_timeout); | |
3510 | break; | |
3511 | case ISCSI_PARAM_LU_RESET_TMO: | |
3512 | sscanf(buf, "%d", &session->lu_reset_timeout); | |
3513 | break; | |
3fe5ae8b MC |
3514 | case ISCSI_PARAM_TGT_RESET_TMO: |
3515 | sscanf(buf, "%d", &session->tgt_reset_timeout); | |
3516 | break; | |
f6d5180c MC |
3517 | case ISCSI_PARAM_PING_TMO: |
3518 | sscanf(buf, "%d", &conn->ping_timeout); | |
3519 | break; | |
3520 | case ISCSI_PARAM_RECV_TMO: | |
3521 | sscanf(buf, "%d", &conn->recv_timeout); | |
3522 | break; | |
a54a52ca MC |
3523 | case ISCSI_PARAM_MAX_RECV_DLENGTH: |
3524 | sscanf(buf, "%d", &conn->max_recv_dlength); | |
3525 | break; | |
3526 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
3527 | sscanf(buf, "%d", &conn->max_xmit_dlength); | |
3528 | break; | |
3529 | case ISCSI_PARAM_HDRDGST_EN: | |
3530 | sscanf(buf, "%d", &conn->hdrdgst_en); | |
3531 | break; | |
3532 | case ISCSI_PARAM_DATADGST_EN: | |
3533 | sscanf(buf, "%d", &conn->datadgst_en); | |
3534 | break; | |
3535 | case ISCSI_PARAM_INITIAL_R2T_EN: | |
3536 | sscanf(buf, "%d", &session->initial_r2t_en); | |
3537 | break; | |
3538 | case ISCSI_PARAM_MAX_R2T: | |
1304be5f | 3539 | sscanf(buf, "%hu", &session->max_r2t); |
a54a52ca MC |
3540 | break; |
3541 | case ISCSI_PARAM_IMM_DATA_EN: | |
3542 | sscanf(buf, "%d", &session->imm_data_en); | |
3543 | break; | |
3544 | case ISCSI_PARAM_FIRST_BURST: | |
3545 | sscanf(buf, "%d", &session->first_burst); | |
3546 | break; | |
3547 | case ISCSI_PARAM_MAX_BURST: | |
3548 | sscanf(buf, "%d", &session->max_burst); | |
3549 | break; | |
3550 | case ISCSI_PARAM_PDU_INORDER_EN: | |
3551 | sscanf(buf, "%d", &session->pdu_inorder_en); | |
3552 | break; | |
3553 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
3554 | sscanf(buf, "%d", &session->dataseq_inorder_en); | |
3555 | break; | |
3556 | case ISCSI_PARAM_ERL: | |
3557 | sscanf(buf, "%d", &session->erl); | |
3558 | break; | |
a54a52ca MC |
3559 | case ISCSI_PARAM_EXP_STATSN: |
3560 | sscanf(buf, "%u", &conn->exp_statsn); | |
3561 | break; | |
b2c64167 | 3562 | case ISCSI_PARAM_USERNAME: |
5700b1af | 3563 | return iscsi_switch_str_param(&session->username, buf); |
b2c64167 | 3564 | case ISCSI_PARAM_USERNAME_IN: |
5700b1af | 3565 | return iscsi_switch_str_param(&session->username_in, buf); |
b2c64167 | 3566 | case ISCSI_PARAM_PASSWORD: |
5700b1af | 3567 | return iscsi_switch_str_param(&session->password, buf); |
b2c64167 | 3568 | case ISCSI_PARAM_PASSWORD_IN: |
5700b1af | 3569 | return iscsi_switch_str_param(&session->password_in, buf); |
a54a52ca | 3570 | case ISCSI_PARAM_TARGET_NAME: |
5700b1af | 3571 | return iscsi_switch_str_param(&session->targetname, buf); |
3c5c4801 VC |
3572 | case ISCSI_PARAM_TARGET_ALIAS: |
3573 | return iscsi_switch_str_param(&session->targetalias, buf); | |
a54a52ca MC |
3574 | case ISCSI_PARAM_TPGT: |
3575 | sscanf(buf, "%d", &session->tpgt); | |
3576 | break; | |
3577 | case ISCSI_PARAM_PERSISTENT_PORT: | |
3578 | sscanf(buf, "%d", &conn->persistent_port); | |
3579 | break; | |
3580 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
5700b1af | 3581 | return iscsi_switch_str_param(&conn->persistent_address, buf); |
88dfd340 | 3582 | case ISCSI_PARAM_IFACE_NAME: |
5700b1af | 3583 | return iscsi_switch_str_param(&session->ifacename, buf); |
88dfd340 | 3584 | case ISCSI_PARAM_INITIATOR_NAME: |
5700b1af | 3585 | return iscsi_switch_str_param(&session->initiatorname, buf); |
3b9373e9 EW |
3586 | case ISCSI_PARAM_BOOT_ROOT: |
3587 | return iscsi_switch_str_param(&session->boot_root, buf); | |
3588 | case ISCSI_PARAM_BOOT_NIC: | |
3589 | return iscsi_switch_str_param(&session->boot_nic, buf); | |
3590 | case ISCSI_PARAM_BOOT_TARGET: | |
3591 | return iscsi_switch_str_param(&session->boot_target, buf); | |
f8525eb4 AC |
3592 | case ISCSI_PARAM_PORTAL_TYPE: |
3593 | return iscsi_switch_str_param(&session->portal_type, buf); | |
3594 | case ISCSI_PARAM_DISCOVERY_PARENT_TYPE: | |
3595 | return iscsi_switch_str_param(&session->discovery_parent_type, | |
3596 | buf); | |
6a06a4b8 OG |
3597 | case ISCSI_PARAM_DISCOVERY_SESS: |
3598 | sscanf(buf, "%d", &val); | |
3599 | session->discovery_sess = !!val; | |
3600 | break; | |
ae56ff40 AC |
3601 | case ISCSI_PARAM_LOCAL_IPADDR: |
3602 | return iscsi_switch_str_param(&conn->local_ipaddr, buf); | |
a54a52ca MC |
3603 | default: |
3604 | return -ENOSYS; | |
3605 | } | |
3606 | ||
3607 | return 0; | |
3608 | } | |
3609 | EXPORT_SYMBOL_GPL(iscsi_set_param); | |
3610 | ||
3611 | int iscsi_session_get_param(struct iscsi_cls_session *cls_session, | |
3612 | enum iscsi_param param, char *buf) | |
3613 | { | |
75613521 | 3614 | struct iscsi_session *session = cls_session->dd_data; |
a54a52ca MC |
3615 | int len; |
3616 | ||
3617 | switch(param) { | |
843c0a8a | 3618 | case ISCSI_PARAM_FAST_ABORT: |
ec98ea70 | 3619 | len = sysfs_emit(buf, "%d\n", session->fast_abort); |
843c0a8a | 3620 | break; |
f6d5180c | 3621 | case ISCSI_PARAM_ABORT_TMO: |
ec98ea70 | 3622 | len = sysfs_emit(buf, "%d\n", session->abort_timeout); |
f6d5180c MC |
3623 | break; |
3624 | case ISCSI_PARAM_LU_RESET_TMO: | |
ec98ea70 | 3625 | len = sysfs_emit(buf, "%d\n", session->lu_reset_timeout); |
f6d5180c | 3626 | break; |
3fe5ae8b | 3627 | case ISCSI_PARAM_TGT_RESET_TMO: |
ec98ea70 | 3628 | len = sysfs_emit(buf, "%d\n", session->tgt_reset_timeout); |
3fe5ae8b | 3629 | break; |
a54a52ca | 3630 | case ISCSI_PARAM_INITIAL_R2T_EN: |
ec98ea70 | 3631 | len = sysfs_emit(buf, "%d\n", session->initial_r2t_en); |
a54a52ca MC |
3632 | break; |
3633 | case ISCSI_PARAM_MAX_R2T: | |
ec98ea70 | 3634 | len = sysfs_emit(buf, "%hu\n", session->max_r2t); |
a54a52ca MC |
3635 | break; |
3636 | case ISCSI_PARAM_IMM_DATA_EN: | |
ec98ea70 | 3637 | len = sysfs_emit(buf, "%d\n", session->imm_data_en); |
a54a52ca MC |
3638 | break; |
3639 | case ISCSI_PARAM_FIRST_BURST: | |
ec98ea70 | 3640 | len = sysfs_emit(buf, "%u\n", session->first_burst); |
a54a52ca MC |
3641 | break; |
3642 | case ISCSI_PARAM_MAX_BURST: | |
ec98ea70 | 3643 | len = sysfs_emit(buf, "%u\n", session->max_burst); |
a54a52ca MC |
3644 | break; |
3645 | case ISCSI_PARAM_PDU_INORDER_EN: | |
ec98ea70 | 3646 | len = sysfs_emit(buf, "%d\n", session->pdu_inorder_en); |
a54a52ca MC |
3647 | break; |
3648 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
ec98ea70 | 3649 | len = sysfs_emit(buf, "%d\n", session->dataseq_inorder_en); |
a54a52ca | 3650 | break; |
5f09e1f3 | 3651 | case ISCSI_PARAM_DEF_TASKMGMT_TMO: |
ec98ea70 | 3652 | len = sysfs_emit(buf, "%d\n", session->def_taskmgmt_tmo); |
5f09e1f3 | 3653 | break; |
a54a52ca | 3654 | case ISCSI_PARAM_ERL: |
ec98ea70 | 3655 | len = sysfs_emit(buf, "%d\n", session->erl); |
a54a52ca MC |
3656 | break; |
3657 | case ISCSI_PARAM_TARGET_NAME: | |
ec98ea70 | 3658 | len = sysfs_emit(buf, "%s\n", session->targetname); |
a54a52ca | 3659 | break; |
3c5c4801 | 3660 | case ISCSI_PARAM_TARGET_ALIAS: |
ec98ea70 | 3661 | len = sysfs_emit(buf, "%s\n", session->targetalias); |
3c5c4801 | 3662 | break; |
a54a52ca | 3663 | case ISCSI_PARAM_TPGT: |
ec98ea70 | 3664 | len = sysfs_emit(buf, "%d\n", session->tpgt); |
a54a52ca | 3665 | break; |
b2c64167 | 3666 | case ISCSI_PARAM_USERNAME: |
ec98ea70 | 3667 | len = sysfs_emit(buf, "%s\n", session->username); |
b2c64167 MC |
3668 | break; |
3669 | case ISCSI_PARAM_USERNAME_IN: | |
ec98ea70 | 3670 | len = sysfs_emit(buf, "%s\n", session->username_in); |
b2c64167 MC |
3671 | break; |
3672 | case ISCSI_PARAM_PASSWORD: | |
ec98ea70 | 3673 | len = sysfs_emit(buf, "%s\n", session->password); |
b2c64167 MC |
3674 | break; |
3675 | case ISCSI_PARAM_PASSWORD_IN: | |
ec98ea70 | 3676 | len = sysfs_emit(buf, "%s\n", session->password_in); |
b2c64167 | 3677 | break; |
88dfd340 | 3678 | case ISCSI_PARAM_IFACE_NAME: |
ec98ea70 | 3679 | len = sysfs_emit(buf, "%s\n", session->ifacename); |
88dfd340 MC |
3680 | break; |
3681 | case ISCSI_PARAM_INITIATOR_NAME: | |
ec98ea70 | 3682 | len = sysfs_emit(buf, "%s\n", session->initiatorname); |
88dfd340 | 3683 | break; |
3b9373e9 | 3684 | case ISCSI_PARAM_BOOT_ROOT: |
ec98ea70 | 3685 | len = sysfs_emit(buf, "%s\n", session->boot_root); |
3b9373e9 EW |
3686 | break; |
3687 | case ISCSI_PARAM_BOOT_NIC: | |
ec98ea70 | 3688 | len = sysfs_emit(buf, "%s\n", session->boot_nic); |
3b9373e9 EW |
3689 | break; |
3690 | case ISCSI_PARAM_BOOT_TARGET: | |
ec98ea70 | 3691 | len = sysfs_emit(buf, "%s\n", session->boot_target); |
9a2307b1 | 3692 | break; |
f8525eb4 | 3693 | case ISCSI_PARAM_AUTO_SND_TGT_DISABLE: |
ec98ea70 | 3694 | len = sysfs_emit(buf, "%u\n", session->auto_snd_tgt_disable); |
f8525eb4 AC |
3695 | break; |
3696 | case ISCSI_PARAM_DISCOVERY_SESS: | |
ec98ea70 | 3697 | len = sysfs_emit(buf, "%u\n", session->discovery_sess); |
f8525eb4 AC |
3698 | break; |
3699 | case ISCSI_PARAM_PORTAL_TYPE: | |
ec98ea70 | 3700 | len = sysfs_emit(buf, "%s\n", session->portal_type); |
f8525eb4 AC |
3701 | break; |
3702 | case ISCSI_PARAM_CHAP_AUTH_EN: | |
ec98ea70 | 3703 | len = sysfs_emit(buf, "%u\n", session->chap_auth_en); |
f8525eb4 AC |
3704 | break; |
3705 | case ISCSI_PARAM_DISCOVERY_LOGOUT_EN: | |
ec98ea70 | 3706 | len = sysfs_emit(buf, "%u\n", session->discovery_logout_en); |
f8525eb4 AC |
3707 | break; |
3708 | case ISCSI_PARAM_BIDI_CHAP_EN: | |
ec98ea70 | 3709 | len = sysfs_emit(buf, "%u\n", session->bidi_chap_en); |
f8525eb4 AC |
3710 | break; |
3711 | case ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL: | |
ec98ea70 | 3712 | len = sysfs_emit(buf, "%u\n", session->discovery_auth_optional); |
f8525eb4 AC |
3713 | break; |
3714 | case ISCSI_PARAM_DEF_TIME2WAIT: | |
ec98ea70 | 3715 | len = sysfs_emit(buf, "%d\n", session->time2wait); |
f8525eb4 AC |
3716 | break; |
3717 | case ISCSI_PARAM_DEF_TIME2RETAIN: | |
ec98ea70 | 3718 | len = sysfs_emit(buf, "%d\n", session->time2retain); |
f8525eb4 AC |
3719 | break; |
3720 | case ISCSI_PARAM_TSID: | |
ec98ea70 | 3721 | len = sysfs_emit(buf, "%u\n", session->tsid); |
f8525eb4 AC |
3722 | break; |
3723 | case ISCSI_PARAM_ISID: | |
ec98ea70 | 3724 | len = sysfs_emit(buf, "%02x%02x%02x%02x%02x%02x\n", |
f8525eb4 AC |
3725 | session->isid[0], session->isid[1], |
3726 | session->isid[2], session->isid[3], | |
3727 | session->isid[4], session->isid[5]); | |
3728 | break; | |
3729 | case ISCSI_PARAM_DISCOVERY_PARENT_IDX: | |
ec98ea70 | 3730 | len = sysfs_emit(buf, "%u\n", session->discovery_parent_idx); |
f8525eb4 AC |
3731 | break; |
3732 | case ISCSI_PARAM_DISCOVERY_PARENT_TYPE: | |
3733 | if (session->discovery_parent_type) | |
ec98ea70 | 3734 | len = sysfs_emit(buf, "%s\n", |
f8525eb4 AC |
3735 | session->discovery_parent_type); |
3736 | else | |
ec98ea70 | 3737 | len = sysfs_emit(buf, "\n"); |
3b9373e9 | 3738 | break; |
a54a52ca MC |
3739 | default: |
3740 | return -ENOSYS; | |
3741 | } | |
3742 | ||
3743 | return len; | |
3744 | } | |
3745 | EXPORT_SYMBOL_GPL(iscsi_session_get_param); | |
3746 | ||
00f3708e MC |
3747 | int iscsi_conn_get_addr_param(struct sockaddr_storage *addr, |
3748 | enum iscsi_param param, char *buf) | |
3749 | { | |
3750 | struct sockaddr_in6 *sin6 = NULL; | |
3751 | struct sockaddr_in *sin = NULL; | |
3752 | int len; | |
3753 | ||
3754 | switch (addr->ss_family) { | |
3755 | case AF_INET: | |
3756 | sin = (struct sockaddr_in *)addr; | |
3757 | break; | |
3758 | case AF_INET6: | |
3759 | sin6 = (struct sockaddr_in6 *)addr; | |
3760 | break; | |
3761 | default: | |
3762 | return -EINVAL; | |
3763 | } | |
3764 | ||
3765 | switch (param) { | |
3766 | case ISCSI_PARAM_CONN_ADDRESS: | |
3767 | case ISCSI_HOST_PARAM_IPADDRESS: | |
3768 | if (sin) | |
ec98ea70 | 3769 | len = sysfs_emit(buf, "%pI4\n", &sin->sin_addr.s_addr); |
00f3708e | 3770 | else |
ec98ea70 | 3771 | len = sysfs_emit(buf, "%pI6\n", &sin6->sin6_addr); |
00f3708e MC |
3772 | break; |
3773 | case ISCSI_PARAM_CONN_PORT: | |
4bfb8ebf | 3774 | case ISCSI_PARAM_LOCAL_PORT: |
00f3708e | 3775 | if (sin) |
ec98ea70 | 3776 | len = sysfs_emit(buf, "%hu\n", be16_to_cpu(sin->sin_port)); |
00f3708e | 3777 | else |
ec98ea70 | 3778 | len = sysfs_emit(buf, "%hu\n", |
00f3708e MC |
3779 | be16_to_cpu(sin6->sin6_port)); |
3780 | break; | |
3781 | default: | |
3782 | return -EINVAL; | |
3783 | } | |
3784 | ||
3785 | return len; | |
3786 | } | |
3787 | EXPORT_SYMBOL_GPL(iscsi_conn_get_addr_param); | |
3788 | ||
a54a52ca MC |
3789 | int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn, |
3790 | enum iscsi_param param, char *buf) | |
3791 | { | |
3792 | struct iscsi_conn *conn = cls_conn->dd_data; | |
3793 | int len; | |
3794 | ||
3795 | switch(param) { | |
f6d5180c | 3796 | case ISCSI_PARAM_PING_TMO: |
ec98ea70 | 3797 | len = sysfs_emit(buf, "%u\n", conn->ping_timeout); |
f6d5180c MC |
3798 | break; |
3799 | case ISCSI_PARAM_RECV_TMO: | |
ec98ea70 | 3800 | len = sysfs_emit(buf, "%u\n", conn->recv_timeout); |
f6d5180c | 3801 | break; |
a54a52ca | 3802 | case ISCSI_PARAM_MAX_RECV_DLENGTH: |
ec98ea70 | 3803 | len = sysfs_emit(buf, "%u\n", conn->max_recv_dlength); |
a54a52ca MC |
3804 | break; |
3805 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
ec98ea70 | 3806 | len = sysfs_emit(buf, "%u\n", conn->max_xmit_dlength); |
a54a52ca MC |
3807 | break; |
3808 | case ISCSI_PARAM_HDRDGST_EN: | |
ec98ea70 | 3809 | len = sysfs_emit(buf, "%d\n", conn->hdrdgst_en); |
a54a52ca MC |
3810 | break; |
3811 | case ISCSI_PARAM_DATADGST_EN: | |
ec98ea70 | 3812 | len = sysfs_emit(buf, "%d\n", conn->datadgst_en); |
a54a52ca MC |
3813 | break; |
3814 | case ISCSI_PARAM_IFMARKER_EN: | |
ec98ea70 | 3815 | len = sysfs_emit(buf, "%d\n", conn->ifmarker_en); |
a54a52ca MC |
3816 | break; |
3817 | case ISCSI_PARAM_OFMARKER_EN: | |
ec98ea70 | 3818 | len = sysfs_emit(buf, "%d\n", conn->ofmarker_en); |
a54a52ca MC |
3819 | break; |
3820 | case ISCSI_PARAM_EXP_STATSN: | |
ec98ea70 | 3821 | len = sysfs_emit(buf, "%u\n", conn->exp_statsn); |
a54a52ca MC |
3822 | break; |
3823 | case ISCSI_PARAM_PERSISTENT_PORT: | |
ec98ea70 | 3824 | len = sysfs_emit(buf, "%d\n", conn->persistent_port); |
a54a52ca MC |
3825 | break; |
3826 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
ec98ea70 | 3827 | len = sysfs_emit(buf, "%s\n", conn->persistent_address); |
a54a52ca | 3828 | break; |
f8525eb4 | 3829 | case ISCSI_PARAM_STATSN: |
ec98ea70 | 3830 | len = sysfs_emit(buf, "%u\n", conn->statsn); |
f8525eb4 AC |
3831 | break; |
3832 | case ISCSI_PARAM_MAX_SEGMENT_SIZE: | |
ec98ea70 | 3833 | len = sysfs_emit(buf, "%u\n", conn->max_segment_size); |
f8525eb4 AC |
3834 | break; |
3835 | case ISCSI_PARAM_KEEPALIVE_TMO: | |
ec98ea70 | 3836 | len = sysfs_emit(buf, "%u\n", conn->keepalive_tmo); |
f8525eb4 AC |
3837 | break; |
3838 | case ISCSI_PARAM_LOCAL_PORT: | |
ec98ea70 | 3839 | len = sysfs_emit(buf, "%u\n", conn->local_port); |
f8525eb4 AC |
3840 | break; |
3841 | case ISCSI_PARAM_TCP_TIMESTAMP_STAT: | |
ec98ea70 | 3842 | len = sysfs_emit(buf, "%u\n", conn->tcp_timestamp_stat); |
f8525eb4 AC |
3843 | break; |
3844 | case ISCSI_PARAM_TCP_NAGLE_DISABLE: | |
ec98ea70 | 3845 | len = sysfs_emit(buf, "%u\n", conn->tcp_nagle_disable); |
f8525eb4 AC |
3846 | break; |
3847 | case ISCSI_PARAM_TCP_WSF_DISABLE: | |
ec98ea70 | 3848 | len = sysfs_emit(buf, "%u\n", conn->tcp_wsf_disable); |
f8525eb4 AC |
3849 | break; |
3850 | case ISCSI_PARAM_TCP_TIMER_SCALE: | |
ec98ea70 | 3851 | len = sysfs_emit(buf, "%u\n", conn->tcp_timer_scale); |
f8525eb4 AC |
3852 | break; |
3853 | case ISCSI_PARAM_TCP_TIMESTAMP_EN: | |
ec98ea70 | 3854 | len = sysfs_emit(buf, "%u\n", conn->tcp_timestamp_en); |
f8525eb4 AC |
3855 | break; |
3856 | case ISCSI_PARAM_IP_FRAGMENT_DISABLE: | |
ec98ea70 | 3857 | len = sysfs_emit(buf, "%u\n", conn->fragment_disable); |
f8525eb4 AC |
3858 | break; |
3859 | case ISCSI_PARAM_IPV4_TOS: | |
ec98ea70 | 3860 | len = sysfs_emit(buf, "%u\n", conn->ipv4_tos); |
f8525eb4 AC |
3861 | break; |
3862 | case ISCSI_PARAM_IPV6_TC: | |
ec98ea70 | 3863 | len = sysfs_emit(buf, "%u\n", conn->ipv6_traffic_class); |
f8525eb4 | 3864 | break; |
5f09e1f3 | 3865 | case ISCSI_PARAM_IPV6_FLOW_LABEL: |
ec98ea70 | 3866 | len = sysfs_emit(buf, "%u\n", conn->ipv6_flow_label); |
5f09e1f3 | 3867 | break; |
f8525eb4 | 3868 | case ISCSI_PARAM_IS_FW_ASSIGNED_IPV6: |
ec98ea70 | 3869 | len = sysfs_emit(buf, "%u\n", conn->is_fw_assigned_ipv6); |
f8525eb4 AC |
3870 | break; |
3871 | case ISCSI_PARAM_TCP_XMIT_WSF: | |
ec98ea70 | 3872 | len = sysfs_emit(buf, "%u\n", conn->tcp_xmit_wsf); |
f8525eb4 AC |
3873 | break; |
3874 | case ISCSI_PARAM_TCP_RECV_WSF: | |
ec98ea70 | 3875 | len = sysfs_emit(buf, "%u\n", conn->tcp_recv_wsf); |
f8525eb4 | 3876 | break; |
ae56ff40 | 3877 | case ISCSI_PARAM_LOCAL_IPADDR: |
ec98ea70 | 3878 | len = sysfs_emit(buf, "%s\n", conn->local_ipaddr); |
ae56ff40 | 3879 | break; |
a54a52ca MC |
3880 | default: |
3881 | return -ENOSYS; | |
3882 | } | |
3883 | ||
3884 | return len; | |
3885 | } | |
3886 | EXPORT_SYMBOL_GPL(iscsi_conn_get_param); | |
3887 | ||
0801c242 MC |
3888 | int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param, |
3889 | char *buf) | |
3890 | { | |
75613521 | 3891 | struct iscsi_host *ihost = shost_priv(shost); |
0801c242 MC |
3892 | int len; |
3893 | ||
3894 | switch (param) { | |
d8196ed2 | 3895 | case ISCSI_HOST_PARAM_NETDEV_NAME: |
ec98ea70 | 3896 | len = sysfs_emit(buf, "%s\n", ihost->netdev); |
d8196ed2 | 3897 | break; |
0801c242 | 3898 | case ISCSI_HOST_PARAM_HWADDRESS: |
ec98ea70 | 3899 | len = sysfs_emit(buf, "%s\n", ihost->hwaddress); |
0801c242 | 3900 | break; |
8ad5781a | 3901 | case ISCSI_HOST_PARAM_INITIATOR_NAME: |
ec98ea70 | 3902 | len = sysfs_emit(buf, "%s\n", ihost->initiatorname); |
8ad5781a | 3903 | break; |
0801c242 MC |
3904 | default: |
3905 | return -ENOSYS; | |
3906 | } | |
3907 | ||
3908 | return len; | |
3909 | } | |
3910 | EXPORT_SYMBOL_GPL(iscsi_host_get_param); | |
3911 | ||
3912 | int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param, | |
3913 | char *buf, int buflen) | |
3914 | { | |
75613521 | 3915 | struct iscsi_host *ihost = shost_priv(shost); |
0801c242 MC |
3916 | |
3917 | switch (param) { | |
d8196ed2 | 3918 | case ISCSI_HOST_PARAM_NETDEV_NAME: |
5700b1af | 3919 | return iscsi_switch_str_param(&ihost->netdev, buf); |
0801c242 | 3920 | case ISCSI_HOST_PARAM_HWADDRESS: |
5700b1af | 3921 | return iscsi_switch_str_param(&ihost->hwaddress, buf); |
8ad5781a | 3922 | case ISCSI_HOST_PARAM_INITIATOR_NAME: |
5700b1af | 3923 | return iscsi_switch_str_param(&ihost->initiatorname, buf); |
0801c242 MC |
3924 | default: |
3925 | return -ENOSYS; | |
3926 | } | |
3927 | ||
3928 | return 0; | |
3929 | } | |
3930 | EXPORT_SYMBOL_GPL(iscsi_host_set_param); | |
3931 | ||
7996a778 MC |
3932 | MODULE_AUTHOR("Mike Christie"); |
3933 | MODULE_DESCRIPTION("iSCSI library functions"); | |
3934 | MODULE_LICENSE("GPL"); |