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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 | ||
32ae763e MC |
86 | inline void iscsi_conn_queue_work(struct iscsi_conn *conn) |
87 | { | |
88 | struct Scsi_Host *shost = conn->session->host; | |
89 | struct iscsi_host *ihost = shost_priv(shost); | |
90 | ||
1336aed1 MC |
91 | if (ihost->workq) |
92 | queue_work(ihost->workq, &conn->xmitwork); | |
32ae763e MC |
93 | } |
94 | EXPORT_SYMBOL_GPL(iscsi_conn_queue_work); | |
95 | ||
4c0ba5d2 MC |
96 | static void __iscsi_update_cmdsn(struct iscsi_session *session, |
97 | uint32_t exp_cmdsn, uint32_t max_cmdsn) | |
7996a778 | 98 | { |
77a23c21 MC |
99 | /* |
100 | * standard specifies this check for when to update expected and | |
101 | * max sequence numbers | |
102 | */ | |
103 | if (iscsi_sna_lt(max_cmdsn, exp_cmdsn - 1)) | |
104 | return; | |
105 | ||
106 | if (exp_cmdsn != session->exp_cmdsn && | |
107 | !iscsi_sna_lt(exp_cmdsn, session->exp_cmdsn)) | |
7996a778 MC |
108 | session->exp_cmdsn = exp_cmdsn; |
109 | ||
77a23c21 | 110 | if (max_cmdsn != session->max_cmdsn && |
46a84c65 | 111 | !iscsi_sna_lt(max_cmdsn, session->max_cmdsn)) |
77a23c21 | 112 | session->max_cmdsn = max_cmdsn; |
7996a778 | 113 | } |
4c0ba5d2 MC |
114 | |
115 | void iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr) | |
116 | { | |
117 | __iscsi_update_cmdsn(session, be32_to_cpu(hdr->exp_cmdsn), | |
118 | be32_to_cpu(hdr->max_cmdsn)); | |
119 | } | |
77a23c21 | 120 | EXPORT_SYMBOL_GPL(iscsi_update_cmdsn); |
7996a778 | 121 | |
577577da MC |
122 | /** |
123 | * iscsi_prep_data_out_pdu - initialize Data-Out | |
124 | * @task: scsi command task | |
125 | * @r2t: R2T info | |
126 | * @hdr: iscsi data in pdu | |
127 | * | |
128 | * Notes: | |
129 | * Initialize Data-Out within this R2T sequence and finds | |
130 | * proper data_offset within this SCSI command. | |
131 | * | |
132 | * This function is called with connection lock taken. | |
133 | **/ | |
134 | void iscsi_prep_data_out_pdu(struct iscsi_task *task, struct iscsi_r2t_info *r2t, | |
135 | struct iscsi_data *hdr) | |
7996a778 | 136 | { |
9c19a7d0 | 137 | struct iscsi_conn *conn = task->conn; |
577577da MC |
138 | unsigned int left = r2t->data_length - r2t->sent; |
139 | ||
140 | task->hdr_len = sizeof(struct iscsi_data); | |
7996a778 MC |
141 | |
142 | memset(hdr, 0, sizeof(struct iscsi_data)); | |
577577da MC |
143 | hdr->ttt = r2t->ttt; |
144 | hdr->datasn = cpu_to_be32(r2t->datasn); | |
145 | r2t->datasn++; | |
7996a778 | 146 | hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; |
55bdabdf | 147 | hdr->lun = task->lun; |
577577da MC |
148 | hdr->itt = task->hdr_itt; |
149 | hdr->exp_statsn = r2t->exp_statsn; | |
150 | hdr->offset = cpu_to_be32(r2t->data_offset + r2t->sent); | |
151 | if (left > conn->max_xmit_dlength) { | |
7996a778 | 152 | hton24(hdr->dlength, conn->max_xmit_dlength); |
577577da | 153 | r2t->data_count = conn->max_xmit_dlength; |
7996a778 MC |
154 | hdr->flags = 0; |
155 | } else { | |
577577da MC |
156 | hton24(hdr->dlength, left); |
157 | r2t->data_count = left; | |
7996a778 MC |
158 | hdr->flags = ISCSI_FLAG_CMD_FINAL; |
159 | } | |
577577da | 160 | conn->dataout_pdus_cnt++; |
7996a778 | 161 | } |
577577da | 162 | EXPORT_SYMBOL_GPL(iscsi_prep_data_out_pdu); |
7996a778 | 163 | |
9c19a7d0 | 164 | static int iscsi_add_hdr(struct iscsi_task *task, unsigned len) |
004d6530 | 165 | { |
9c19a7d0 | 166 | unsigned exp_len = task->hdr_len + len; |
004d6530 | 167 | |
9c19a7d0 | 168 | if (exp_len > task->hdr_max) { |
004d6530 BH |
169 | WARN_ON(1); |
170 | return -EINVAL; | |
171 | } | |
172 | ||
173 | WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */ | |
9c19a7d0 | 174 | task->hdr_len = exp_len; |
004d6530 BH |
175 | return 0; |
176 | } | |
177 | ||
38d1c069 BH |
178 | /* |
179 | * make an extended cdb AHS | |
180 | */ | |
9c19a7d0 | 181 | static int iscsi_prep_ecdb_ahs(struct iscsi_task *task) |
38d1c069 | 182 | { |
9c19a7d0 | 183 | struct scsi_cmnd *cmd = task->sc; |
38d1c069 BH |
184 | unsigned rlen, pad_len; |
185 | unsigned short ahslength; | |
186 | struct iscsi_ecdb_ahdr *ecdb_ahdr; | |
187 | int rc; | |
188 | ||
9c19a7d0 | 189 | ecdb_ahdr = iscsi_next_hdr(task); |
38d1c069 BH |
190 | rlen = cmd->cmd_len - ISCSI_CDB_SIZE; |
191 | ||
192 | BUG_ON(rlen > sizeof(ecdb_ahdr->ecdb)); | |
193 | ahslength = rlen + sizeof(ecdb_ahdr->reserved); | |
194 | ||
195 | pad_len = iscsi_padding(rlen); | |
196 | ||
9c19a7d0 | 197 | rc = iscsi_add_hdr(task, sizeof(ecdb_ahdr->ahslength) + |
38d1c069 BH |
198 | sizeof(ecdb_ahdr->ahstype) + ahslength + pad_len); |
199 | if (rc) | |
200 | return rc; | |
201 | ||
202 | if (pad_len) | |
203 | memset(&ecdb_ahdr->ecdb[rlen], 0, pad_len); | |
204 | ||
205 | ecdb_ahdr->ahslength = cpu_to_be16(ahslength); | |
206 | ecdb_ahdr->ahstype = ISCSI_AHSTYPE_CDB; | |
207 | ecdb_ahdr->reserved = 0; | |
208 | memcpy(ecdb_ahdr->ecdb, cmd->cmnd + ISCSI_CDB_SIZE, rlen); | |
209 | ||
1b2c7af8 MC |
210 | ISCSI_DBG_SESSION(task->conn->session, |
211 | "iscsi_prep_ecdb_ahs: varlen_cdb_len %d " | |
212 | "rlen %d pad_len %d ahs_length %d iscsi_headers_size " | |
213 | "%u\n", cmd->cmd_len, rlen, pad_len, ahslength, | |
214 | task->hdr_len); | |
38d1c069 BH |
215 | return 0; |
216 | } | |
217 | ||
5d12c05e MC |
218 | /** |
219 | * iscsi_check_tmf_restrictions - check if a task is affected by TMF | |
220 | * @task: iscsi task | |
221 | * @opcode: opcode to check for | |
222 | * | |
223 | * During TMF a task has to be checked if it's affected. | |
224 | * All unrelated I/O can be passed through, but I/O to the | |
225 | * affected LUN should be restricted. | |
226 | * If 'fast_abort' is set we won't be sending any I/O to the | |
227 | * affected LUN. | |
228 | * Otherwise the target is waiting for all TTTs to be completed, | |
229 | * so we have to send all outstanding Data-Out PDUs to the target. | |
230 | */ | |
231 | static int iscsi_check_tmf_restrictions(struct iscsi_task *task, int opcode) | |
232 | { | |
ec29d0ac MC |
233 | struct iscsi_session *session = task->conn->session; |
234 | struct iscsi_tm *tmf = &session->tmhdr; | |
9cb78c16 | 235 | u64 hdr_lun; |
5d12c05e | 236 | |
ec29d0ac | 237 | if (session->tmf_state == TMF_INITIAL) |
5d12c05e MC |
238 | return 0; |
239 | ||
240 | if ((tmf->opcode & ISCSI_OPCODE_MASK) != ISCSI_OP_SCSI_TMFUNC) | |
241 | return 0; | |
242 | ||
243 | switch (ISCSI_TM_FUNC_VALUE(tmf)) { | |
244 | case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: | |
245 | /* | |
246 | * Allow PDUs for unrelated LUNs | |
247 | */ | |
55bdabdf | 248 | hdr_lun = scsilun_to_int(&tmf->lun); |
5d12c05e MC |
249 | if (hdr_lun != task->sc->device->lun) |
250 | return 0; | |
df561f66 | 251 | fallthrough; |
3fe5ae8b | 252 | case ISCSI_TM_FUNC_TARGET_WARM_RESET: |
5d12c05e MC |
253 | /* |
254 | * Fail all SCSI cmd PDUs | |
255 | */ | |
256 | if (opcode != ISCSI_OP_SCSI_DATA_OUT) { | |
ec29d0ac MC |
257 | iscsi_session_printk(KERN_INFO, session, |
258 | "task [op %x itt 0x%x/0x%x] rejected.\n", | |
259 | opcode, task->itt, task->hdr_itt); | |
5d12c05e MC |
260 | return -EACCES; |
261 | } | |
262 | /* | |
263 | * And also all data-out PDUs in response to R2T | |
264 | * if fast_abort is set. | |
265 | */ | |
ec29d0ac MC |
266 | if (session->fast_abort) { |
267 | iscsi_session_printk(KERN_INFO, session, | |
268 | "task [op %x itt 0x%x/0x%x] fast abort.\n", | |
269 | opcode, task->itt, task->hdr_itt); | |
5d12c05e MC |
270 | return -EACCES; |
271 | } | |
272 | break; | |
273 | case ISCSI_TM_FUNC_ABORT_TASK: | |
274 | /* | |
275 | * the caller has already checked if the task | |
276 | * they want to abort was in the pending queue so if | |
277 | * we are here the cmd pdu has gone out already, and | |
278 | * we will only hit this for data-outs | |
279 | */ | |
280 | if (opcode == ISCSI_OP_SCSI_DATA_OUT && | |
281 | task->hdr_itt == tmf->rtt) { | |
ec29d0ac | 282 | ISCSI_DBG_SESSION(session, |
5d12c05e MC |
283 | "Preventing task %x/%x from sending " |
284 | "data-out due to abort task in " | |
285 | "progress\n", task->itt, | |
286 | task->hdr_itt); | |
287 | return -EACCES; | |
288 | } | |
289 | break; | |
290 | } | |
291 | ||
292 | return 0; | |
293 | } | |
294 | ||
7996a778 MC |
295 | /** |
296 | * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu | |
9c19a7d0 | 297 | * @task: iscsi task |
7996a778 MC |
298 | * |
299 | * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set | |
300 | * fields like dlength or final based on how much data it sends | |
301 | */ | |
9c19a7d0 | 302 | static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task) |
7996a778 | 303 | { |
9c19a7d0 | 304 | struct iscsi_conn *conn = task->conn; |
7996a778 | 305 | struct iscsi_session *session = conn->session; |
9c19a7d0 | 306 | struct scsi_cmnd *sc = task->sc; |
12352183 | 307 | struct iscsi_scsi_req *hdr; |
d77e6535 | 308 | unsigned hdrlength, cmd_len, transfer_length; |
262ef636 | 309 | itt_t itt; |
004d6530 | 310 | int rc; |
7996a778 | 311 | |
5d12c05e MC |
312 | rc = iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_CMD); |
313 | if (rc) | |
314 | return rc; | |
315 | ||
184b57c6 MC |
316 | if (conn->session->tt->alloc_pdu) { |
317 | rc = conn->session->tt->alloc_pdu(task, ISCSI_OP_SCSI_CMD); | |
318 | if (rc) | |
319 | return rc; | |
320 | } | |
12352183 | 321 | hdr = (struct iscsi_scsi_req *)task->hdr; |
262ef636 | 322 | itt = hdr->itt; |
577577da MC |
323 | memset(hdr, 0, sizeof(*hdr)); |
324 | ||
2ff79d52 MC |
325 | if (session->tt->parse_pdu_itt) |
326 | hdr->itt = task->hdr_itt = itt; | |
327 | else | |
328 | hdr->itt = task->hdr_itt = build_itt(task->itt, | |
329 | task->conn->session->age); | |
9c19a7d0 MC |
330 | task->hdr_len = 0; |
331 | rc = iscsi_add_hdr(task, sizeof(*hdr)); | |
004d6530 BH |
332 | if (rc) |
333 | return rc; | |
a8ac6311 OK |
334 | hdr->opcode = ISCSI_OP_SCSI_CMD; |
335 | hdr->flags = ISCSI_ATTR_SIMPLE; | |
55bdabdf AG |
336 | int_to_scsilun(sc->device->lun, &hdr->lun); |
337 | task->lun = hdr->lun; | |
a8ac6311 | 338 | hdr->exp_statsn = cpu_to_be32(conn->exp_statsn); |
38d1c069 BH |
339 | cmd_len = sc->cmd_len; |
340 | if (cmd_len < ISCSI_CDB_SIZE) | |
341 | memset(&hdr->cdb[cmd_len], 0, ISCSI_CDB_SIZE - cmd_len); | |
342 | else if (cmd_len > ISCSI_CDB_SIZE) { | |
9c19a7d0 | 343 | rc = iscsi_prep_ecdb_ahs(task); |
38d1c069 BH |
344 | if (rc) |
345 | return rc; | |
346 | cmd_len = ISCSI_CDB_SIZE; | |
347 | } | |
348 | memcpy(hdr->cdb, sc->cmnd, cmd_len); | |
7996a778 | 349 | |
9c19a7d0 | 350 | task->imm_count = 0; |
55e51eda SG |
351 | if (scsi_get_prot_op(sc) != SCSI_PROT_NORMAL) |
352 | task->protected = true; | |
353 | ||
d77e6535 SG |
354 | transfer_length = scsi_transfer_length(sc); |
355 | hdr->data_length = cpu_to_be32(transfer_length); | |
7996a778 | 356 | if (sc->sc_data_direction == DMA_TO_DEVICE) { |
577577da MC |
357 | struct iscsi_r2t_info *r2t = &task->unsol_r2t; |
358 | ||
7996a778 MC |
359 | hdr->flags |= ISCSI_FLAG_CMD_WRITE; |
360 | /* | |
361 | * Write counters: | |
362 | * | |
363 | * imm_count bytes to be sent right after | |
364 | * SCSI PDU Header | |
365 | * | |
366 | * unsol_count bytes(as Data-Out) to be sent | |
367 | * without R2T ack right after | |
368 | * immediate data | |
369 | * | |
577577da | 370 | * r2t data_length bytes to be sent via R2T ack's |
7996a778 MC |
371 | * |
372 | * pad_count bytes to be sent as zero-padding | |
373 | */ | |
577577da | 374 | memset(r2t, 0, sizeof(*r2t)); |
7996a778 MC |
375 | |
376 | if (session->imm_data_en) { | |
d77e6535 | 377 | if (transfer_length >= session->first_burst) |
9c19a7d0 | 378 | task->imm_count = min(session->first_burst, |
7996a778 MC |
379 | conn->max_xmit_dlength); |
380 | else | |
d77e6535 SG |
381 | task->imm_count = min(transfer_length, |
382 | conn->max_xmit_dlength); | |
9c19a7d0 | 383 | hton24(hdr->dlength, task->imm_count); |
7996a778 | 384 | } else |
a8ac6311 | 385 | zero_data(hdr->dlength); |
7996a778 | 386 | |
ffd0436e | 387 | if (!session->initial_r2t_en) { |
d77e6535 SG |
388 | r2t->data_length = min(session->first_burst, |
389 | transfer_length) - | |
577577da MC |
390 | task->imm_count; |
391 | r2t->data_offset = task->imm_count; | |
392 | r2t->ttt = cpu_to_be32(ISCSI_RESERVED_TAG); | |
393 | r2t->exp_statsn = cpu_to_be32(conn->exp_statsn); | |
ffd0436e MC |
394 | } |
395 | ||
577577da | 396 | if (!task->unsol_r2t.data_length) |
7996a778 | 397 | /* No unsolicit Data-Out's */ |
a8ac6311 | 398 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; |
7996a778 | 399 | } else { |
7996a778 MC |
400 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; |
401 | zero_data(hdr->dlength); | |
402 | ||
403 | if (sc->sc_data_direction == DMA_FROM_DEVICE) | |
404 | hdr->flags |= ISCSI_FLAG_CMD_READ; | |
405 | } | |
406 | ||
004d6530 | 407 | /* calculate size of additional header segments (AHSs) */ |
9c19a7d0 | 408 | hdrlength = task->hdr_len - sizeof(*hdr); |
004d6530 BH |
409 | |
410 | WARN_ON(hdrlength & (ISCSI_PAD_LEN-1)); | |
411 | hdrlength /= ISCSI_PAD_LEN; | |
412 | ||
413 | WARN_ON(hdrlength >= 256); | |
414 | hdr->hlength = hdrlength & 0xFF; | |
96b1f96d | 415 | hdr->cmdsn = task->cmdsn = cpu_to_be32(session->cmdsn); |
004d6530 | 416 | |
577577da | 417 | if (session->tt->init_task && session->tt->init_task(task)) |
052d0144 MC |
418 | return -EIO; |
419 | ||
9c19a7d0 | 420 | task->state = ISCSI_TASK_RUNNING; |
d3305f34 | 421 | session->cmdsn++; |
77a23c21 | 422 | |
a8ac6311 | 423 | conn->scsicmd_pdus_cnt++; |
1b2c7af8 | 424 | ISCSI_DBG_SESSION(session, "iscsi prep [%s cid %d sc %p cdb 0x%x " |
ae3d56d8 | 425 | "itt 0x%x len %d cmdsn %d win %d]\n", |
1b2c7af8 MC |
426 | sc->sc_data_direction == DMA_TO_DEVICE ? |
427 | "write" : "read", conn->id, sc, sc->cmnd[0], | |
d77e6535 | 428 | task->itt, transfer_length, |
1b2c7af8 MC |
429 | session->cmdsn, |
430 | session->max_cmdsn - session->exp_cmdsn + 1); | |
004d6530 | 431 | return 0; |
7996a778 | 432 | } |
7996a778 MC |
433 | |
434 | /** | |
3bbaaad9 | 435 | * iscsi_free_task - free a task |
9c19a7d0 | 436 | * @task: iscsi cmd task |
7996a778 | 437 | * |
659743b0 | 438 | * Must be called with session back_lock. |
3e5c28ad MC |
439 | * This function returns the scsi command to scsi-ml or cleans |
440 | * up mgmt tasks then returns the task to the pool. | |
7996a778 | 441 | */ |
3bbaaad9 | 442 | static void iscsi_free_task(struct iscsi_task *task) |
7996a778 | 443 | { |
9c19a7d0 | 444 | struct iscsi_conn *conn = task->conn; |
c1635cb7 | 445 | struct iscsi_session *session = conn->session; |
9c19a7d0 | 446 | struct scsi_cmnd *sc = task->sc; |
f41d4721 | 447 | int oldstate = task->state; |
7996a778 | 448 | |
4421c9eb MC |
449 | ISCSI_DBG_SESSION(session, "freeing task itt 0x%x state %d sc %p\n", |
450 | task->itt, task->state, task->sc); | |
451 | ||
577577da | 452 | session->tt->cleanup_task(task); |
3bbaaad9 | 453 | task->state = ISCSI_TASK_FREE; |
9c19a7d0 | 454 | task->sc = NULL; |
3e5c28ad | 455 | /* |
9c19a7d0 | 456 | * login task is preallocated so do not free |
3e5c28ad | 457 | */ |
9c19a7d0 | 458 | if (conn->login_task == task) |
3e5c28ad MC |
459 | return; |
460 | ||
7acd72eb | 461 | kfifo_in(&session->cmdpool.queue, (void*)&task, sizeof(void*)); |
052d0144 | 462 | |
3e5c28ad | 463 | if (sc) { |
3e5c28ad | 464 | /* SCSI eh reuses commands to verify us */ |
db22de3e | 465 | iscsi_cmd(sc)->task = NULL; |
3e5c28ad | 466 | /* |
f41d4721 MC |
467 | * queue command may call this to free the task, so |
468 | * it will decide how to return sc to scsi-ml. | |
3e5c28ad | 469 | */ |
f41d4721 | 470 | if (oldstate != ISCSI_TASK_REQUEUE_SCSIQ) |
b4b84edc | 471 | scsi_done(sc); |
3e5c28ad | 472 | } |
7996a778 MC |
473 | } |
474 | ||
913e5bf4 | 475 | void __iscsi_get_task(struct iscsi_task *task) |
60ecebf5 | 476 | { |
6dc618cd | 477 | refcount_inc(&task->refcount); |
60ecebf5 | 478 | } |
913e5bf4 | 479 | EXPORT_SYMBOL_GPL(__iscsi_get_task); |
60ecebf5 | 480 | |
8eea2f55 | 481 | void __iscsi_put_task(struct iscsi_task *task) |
60ecebf5 | 482 | { |
6dc618cd | 483 | if (refcount_dec_and_test(&task->refcount)) |
3bbaaad9 | 484 | iscsi_free_task(task); |
60ecebf5 | 485 | } |
8eea2f55 | 486 | EXPORT_SYMBOL_GPL(__iscsi_put_task); |
60ecebf5 | 487 | |
9c19a7d0 | 488 | void iscsi_put_task(struct iscsi_task *task) |
3e5c28ad | 489 | { |
9c19a7d0 | 490 | struct iscsi_session *session = task->conn->session; |
3e5c28ad | 491 | |
659743b0 SP |
492 | /* regular RX path uses back_lock */ |
493 | spin_lock_bh(&session->back_lock); | |
9c19a7d0 | 494 | __iscsi_put_task(task); |
659743b0 | 495 | spin_unlock_bh(&session->back_lock); |
3e5c28ad | 496 | } |
9c19a7d0 | 497 | EXPORT_SYMBOL_GPL(iscsi_put_task); |
3e5c28ad | 498 | |
3bbaaad9 MC |
499 | /** |
500 | * iscsi_complete_task - finish a task | |
501 | * @task: iscsi cmd task | |
b3cd5050 | 502 | * @state: state to complete task with |
3bbaaad9 | 503 | * |
659743b0 | 504 | * Must be called with session back_lock. |
3bbaaad9 | 505 | */ |
b3cd5050 | 506 | static void iscsi_complete_task(struct iscsi_task *task, int state) |
3bbaaad9 MC |
507 | { |
508 | struct iscsi_conn *conn = task->conn; | |
509 | ||
4421c9eb MC |
510 | ISCSI_DBG_SESSION(conn->session, |
511 | "complete task itt 0x%x state %d sc %p\n", | |
512 | task->itt, task->state, task->sc); | |
b3cd5050 MC |
513 | if (task->state == ISCSI_TASK_COMPLETED || |
514 | task->state == ISCSI_TASK_ABRT_TMF || | |
f41d4721 MC |
515 | task->state == ISCSI_TASK_ABRT_SESS_RECOV || |
516 | task->state == ISCSI_TASK_REQUEUE_SCSIQ) | |
3bbaaad9 MC |
517 | return; |
518 | WARN_ON_ONCE(task->state == ISCSI_TASK_FREE); | |
b3cd5050 | 519 | task->state = state; |
3bbaaad9 | 520 | |
fe0a8a95 LD |
521 | if (READ_ONCE(conn->ping_task) == task) |
522 | WRITE_ONCE(conn->ping_task, NULL); | |
3bbaaad9 MC |
523 | |
524 | /* release get from queueing */ | |
525 | __iscsi_put_task(task); | |
526 | } | |
527 | ||
4c0ba5d2 MC |
528 | /** |
529 | * iscsi_complete_scsi_task - finish scsi task normally | |
530 | * @task: iscsi task for scsi cmd | |
531 | * @exp_cmdsn: expected cmd sn in cpu format | |
532 | * @max_cmdsn: max cmd sn in cpu format | |
533 | * | |
534 | * This is used when drivers do not need or cannot perform | |
535 | * lower level pdu processing. | |
536 | * | |
659743b0 | 537 | * Called with session back_lock |
4c0ba5d2 MC |
538 | */ |
539 | void iscsi_complete_scsi_task(struct iscsi_task *task, | |
540 | uint32_t exp_cmdsn, uint32_t max_cmdsn) | |
541 | { | |
542 | struct iscsi_conn *conn = task->conn; | |
543 | ||
544 | ISCSI_DBG_SESSION(conn->session, "[itt 0x%x]\n", task->itt); | |
545 | ||
546 | conn->last_recv = jiffies; | |
547 | __iscsi_update_cmdsn(conn->session, exp_cmdsn, max_cmdsn); | |
548 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); | |
549 | } | |
550 | EXPORT_SYMBOL_GPL(iscsi_complete_scsi_task); | |
551 | ||
5923d64b MC |
552 | /* |
553 | * Must be called with back and frwd lock | |
554 | */ | |
555 | static bool cleanup_queued_task(struct iscsi_task *task) | |
556 | { | |
557 | struct iscsi_conn *conn = task->conn; | |
558 | bool early_complete = false; | |
559 | ||
560 | /* Bad target might have completed task while it was still running */ | |
561 | if (task->state == ISCSI_TASK_COMPLETED) | |
562 | early_complete = true; | |
563 | ||
564 | if (!list_empty(&task->running)) { | |
565 | list_del_init(&task->running); | |
566 | /* | |
567 | * If it's on a list but still running, this could be from | |
568 | * a bad target sending a rsp early, cleanup from a TMF, or | |
569 | * session recovery. | |
570 | */ | |
571 | if (task->state == ISCSI_TASK_RUNNING || | |
572 | task->state == ISCSI_TASK_COMPLETED) | |
573 | __iscsi_put_task(task); | |
574 | } | |
575 | ||
99b06033 MC |
576 | if (conn->session->running_aborted_task == task) { |
577 | conn->session->running_aborted_task = NULL; | |
578 | __iscsi_put_task(task); | |
579 | } | |
580 | ||
5923d64b MC |
581 | if (conn->task == task) { |
582 | conn->task = NULL; | |
583 | __iscsi_put_task(task); | |
584 | } | |
585 | ||
586 | return early_complete; | |
587 | } | |
4c0ba5d2 | 588 | |
b3a7ea8d | 589 | /* |
14936b1e MC |
590 | * session frwd lock must be held and if not called for a task that is still |
591 | * pending or from the xmit thread, then xmit thread must be suspended | |
b3a7ea8d | 592 | */ |
3bbaaad9 | 593 | static void fail_scsi_task(struct iscsi_task *task, int err) |
b3a7ea8d | 594 | { |
3bbaaad9 | 595 | struct iscsi_conn *conn = task->conn; |
b3a7ea8d | 596 | struct scsi_cmnd *sc; |
b3cd5050 | 597 | int state; |
b3a7ea8d | 598 | |
5923d64b MC |
599 | spin_lock_bh(&conn->session->back_lock); |
600 | if (cleanup_queued_task(task)) { | |
601 | spin_unlock_bh(&conn->session->back_lock); | |
602 | return; | |
603 | } | |
604 | ||
b3cd5050 | 605 | if (task->state == ISCSI_TASK_PENDING) { |
b3a7ea8d MC |
606 | /* |
607 | * cmd never made it to the xmit thread, so we should not count | |
608 | * the cmd in the sequencing | |
609 | */ | |
610 | conn->session->queued_cmdsn--; | |
b3cd5050 MC |
611 | /* it was never sent so just complete like normal */ |
612 | state = ISCSI_TASK_COMPLETED; | |
613 | } else if (err == DID_TRANSPORT_DISRUPTED) | |
614 | state = ISCSI_TASK_ABRT_SESS_RECOV; | |
615 | else | |
616 | state = ISCSI_TASK_ABRT_TMF; | |
b3a7ea8d | 617 | |
14936b1e | 618 | sc = task->sc; |
b3cd5050 | 619 | sc->result = err << 16; |
ae3d56d8 | 620 | scsi_set_resid(sc, scsi_bufflen(sc)); |
b3cd5050 | 621 | iscsi_complete_task(task, state); |
659743b0 | 622 | spin_unlock_bh(&conn->session->back_lock); |
b3a7ea8d MC |
623 | } |
624 | ||
3e5c28ad | 625 | static int iscsi_prep_mgmt_task(struct iscsi_conn *conn, |
9c19a7d0 | 626 | struct iscsi_task *task) |
052d0144 MC |
627 | { |
628 | struct iscsi_session *session = conn->session; | |
577577da | 629 | struct iscsi_hdr *hdr = task->hdr; |
052d0144 | 630 | struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr; |
4f704dc0 | 631 | uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK; |
052d0144 MC |
632 | |
633 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) | |
634 | return -ENOTCONN; | |
635 | ||
4f704dc0 | 636 | if (opcode != ISCSI_OP_LOGIN && opcode != ISCSI_OP_TEXT) |
052d0144 MC |
637 | nop->exp_statsn = cpu_to_be32(conn->exp_statsn); |
638 | /* | |
639 | * pre-format CmdSN for outgoing PDU. | |
640 | */ | |
641 | nop->cmdsn = cpu_to_be32(session->cmdsn); | |
642 | if (hdr->itt != RESERVED_ITT) { | |
052d0144 | 643 | /* |
4f704dc0 | 644 | * TODO: We always use immediate for normal session pdus. |
052d0144 MC |
645 | * If we start to send tmfs or nops as non-immediate then |
646 | * we should start checking the cmdsn numbers for mgmt tasks. | |
4f704dc0 MC |
647 | * |
648 | * During discovery sessions iscsid sends TEXT as non immediate, | |
649 | * but we always only send one PDU at a time. | |
052d0144 MC |
650 | */ |
651 | if (conn->c_stage == ISCSI_CONN_STARTED && | |
652 | !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { | |
653 | session->queued_cmdsn++; | |
654 | session->cmdsn++; | |
655 | } | |
656 | } | |
657 | ||
ae15f801 MC |
658 | if (session->tt->init_task && session->tt->init_task(task)) |
659 | return -EIO; | |
052d0144 MC |
660 | |
661 | if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT) | |
662 | session->state = ISCSI_STATE_LOGGING_OUT; | |
663 | ||
577577da | 664 | task->state = ISCSI_TASK_RUNNING; |
1b2c7af8 MC |
665 | ISCSI_DBG_SESSION(session, "mgmtpdu [op 0x%x hdr->itt 0x%x " |
666 | "datalen %d]\n", hdr->opcode & ISCSI_OPCODE_MASK, | |
667 | hdr->itt, task->data_count); | |
052d0144 MC |
668 | return 0; |
669 | } | |
670 | ||
9c19a7d0 | 671 | static struct iscsi_task * |
f6d5180c MC |
672 | __iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
673 | char *data, uint32_t data_size) | |
674 | { | |
675 | struct iscsi_session *session = conn->session; | |
1336aed1 | 676 | struct iscsi_host *ihost = shost_priv(session->host); |
4f704dc0 | 677 | uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK; |
9c19a7d0 | 678 | struct iscsi_task *task; |
262ef636 | 679 | itt_t itt; |
f6d5180c MC |
680 | |
681 | if (session->state == ISCSI_STATE_TERMINATE) | |
682 | return NULL; | |
683 | ||
4f704dc0 | 684 | if (opcode == ISCSI_OP_LOGIN || opcode == ISCSI_OP_TEXT) { |
f6d5180c MC |
685 | /* |
686 | * Login and Text are sent serially, in | |
687 | * request-followed-by-response sequence. | |
3e5c28ad MC |
688 | * Same task can be used. Same ITT must be used. |
689 | * Note that login_task is preallocated at conn_create(). | |
f6d5180c | 690 | */ |
4f704dc0 MC |
691 | if (conn->login_task->state != ISCSI_TASK_FREE) { |
692 | iscsi_conn_printk(KERN_ERR, conn, "Login/Text in " | |
693 | "progress. Cannot start new task.\n"); | |
694 | return NULL; | |
695 | } | |
696 | ||
cbaa4221 MC |
697 | if (data_size > ISCSI_DEF_MAX_RECV_SEG_LEN) { |
698 | 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); | |
699 | return NULL; | |
700 | } | |
701 | ||
9c19a7d0 | 702 | task = conn->login_task; |
4f704dc0 | 703 | } else { |
26013ad4 MC |
704 | if (session->state != ISCSI_STATE_LOGGED_IN) |
705 | return NULL; | |
706 | ||
cbaa4221 MC |
707 | if (data_size != 0) { |
708 | iscsi_conn_printk(KERN_ERR, conn, "Can not send data buffer of len %u for op 0x%x\n", data_size, opcode); | |
709 | return NULL; | |
710 | } | |
711 | ||
f6d5180c MC |
712 | BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE); |
713 | BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED); | |
714 | ||
7acd72eb | 715 | if (!kfifo_out(&session->cmdpool.queue, |
9c19a7d0 | 716 | (void*)&task, sizeof(void*))) |
f6d5180c MC |
717 | return NULL; |
718 | } | |
3e5c28ad MC |
719 | /* |
720 | * released in complete pdu for task we expect a response for, and | |
721 | * released by the lld when it has transmitted the task for | |
722 | * pdus we do not expect a response for. | |
723 | */ | |
6dc618cd | 724 | refcount_set(&task->refcount, 1); |
9c19a7d0 MC |
725 | task->conn = conn; |
726 | task->sc = NULL; | |
3bbaaad9 MC |
727 | INIT_LIST_HEAD(&task->running); |
728 | task->state = ISCSI_TASK_PENDING; | |
f6d5180c MC |
729 | |
730 | if (data_size) { | |
9c19a7d0 MC |
731 | memcpy(task->data, data, data_size); |
732 | task->data_count = data_size; | |
f6d5180c | 733 | } else |
9c19a7d0 | 734 | task->data_count = 0; |
f6d5180c | 735 | |
184b57c6 MC |
736 | if (conn->session->tt->alloc_pdu) { |
737 | if (conn->session->tt->alloc_pdu(task, hdr->opcode)) { | |
738 | iscsi_conn_printk(KERN_ERR, conn, "Could not allocate " | |
739 | "pdu for mgmt task.\n"); | |
3bbaaad9 | 740 | goto free_task; |
184b57c6 | 741 | } |
577577da | 742 | } |
184b57c6 | 743 | |
262ef636 | 744 | itt = task->hdr->itt; |
577577da | 745 | task->hdr_len = sizeof(struct iscsi_hdr); |
9c19a7d0 | 746 | memcpy(task->hdr, hdr, sizeof(struct iscsi_hdr)); |
262ef636 MC |
747 | |
748 | if (hdr->itt != RESERVED_ITT) { | |
749 | if (session->tt->parse_pdu_itt) | |
750 | task->hdr->itt = itt; | |
751 | else | |
752 | task->hdr->itt = build_itt(task->itt, | |
753 | task->conn->session->age); | |
754 | } | |
755 | ||
fe0a8a95 LD |
756 | if (unlikely(READ_ONCE(conn->ping_task) == INVALID_SCSI_TASK)) |
757 | WRITE_ONCE(conn->ping_task, task); | |
758 | ||
1336aed1 | 759 | if (!ihost->workq) { |
577577da MC |
760 | if (iscsi_prep_mgmt_task(conn, task)) |
761 | goto free_task; | |
052d0144 | 762 | |
9c19a7d0 | 763 | if (session->tt->xmit_task(task)) |
577577da | 764 | goto free_task; |
3bbaaad9 MC |
765 | } else { |
766 | list_add_tail(&task->running, &conn->mgmtqueue); | |
32ae763e | 767 | iscsi_conn_queue_work(conn); |
3bbaaad9 | 768 | } |
052d0144 | 769 | |
9c19a7d0 | 770 | return task; |
577577da MC |
771 | |
772 | free_task: | |
659743b0 | 773 | /* regular RX path uses back_lock */ |
4fa50799 | 774 | spin_lock(&session->back_lock); |
577577da | 775 | __iscsi_put_task(task); |
4fa50799 | 776 | spin_unlock(&session->back_lock); |
577577da | 777 | return NULL; |
f6d5180c MC |
778 | } |
779 | ||
780 | int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr, | |
781 | char *data, uint32_t data_size) | |
782 | { | |
783 | struct iscsi_conn *conn = cls_conn->dd_data; | |
784 | struct iscsi_session *session = conn->session; | |
785 | int err = 0; | |
786 | ||
659743b0 | 787 | spin_lock_bh(&session->frwd_lock); |
f6d5180c MC |
788 | if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size)) |
789 | err = -EPERM; | |
659743b0 | 790 | spin_unlock_bh(&session->frwd_lock); |
f6d5180c MC |
791 | return err; |
792 | } | |
793 | EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu); | |
794 | ||
7996a778 | 795 | /** |
ae6b4e69 | 796 | * iscsi_scsi_cmd_rsp - SCSI Command Response processing |
7996a778 MC |
797 | * @conn: iscsi connection |
798 | * @hdr: iscsi header | |
9c19a7d0 | 799 | * @task: scsi command task |
7996a778 MC |
800 | * @data: cmd data buffer |
801 | * @datalen: len of buffer | |
802 | * | |
803 | * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and | |
a656183e | 804 | * then completes the command and task. called under back_lock |
7996a778 | 805 | **/ |
77a23c21 | 806 | static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
9c19a7d0 | 807 | struct iscsi_task *task, char *data, |
77a23c21 | 808 | int datalen) |
7996a778 | 809 | { |
12352183 | 810 | struct iscsi_scsi_rsp *rhdr = (struct iscsi_scsi_rsp *)hdr; |
7996a778 | 811 | struct iscsi_session *session = conn->session; |
9c19a7d0 | 812 | struct scsi_cmnd *sc = task->sc; |
7996a778 | 813 | |
77a23c21 | 814 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr); |
7996a778 MC |
815 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; |
816 | ||
817 | sc->result = (DID_OK << 16) | rhdr->cmd_status; | |
818 | ||
55e51eda SG |
819 | if (task->protected) { |
820 | sector_t sector; | |
821 | u8 ascq; | |
822 | ||
823 | /** | |
824 | * Transports that didn't implement check_protection | |
825 | * callback but still published T10-PI support to scsi-mid | |
826 | * deserve this BUG_ON. | |
827 | **/ | |
828 | BUG_ON(!session->tt->check_protection); | |
829 | ||
830 | ascq = session->tt->check_protection(task, §or); | |
831 | if (ascq) { | |
f2b1e9c6 | 832 | scsi_build_sense(sc, 1, ILLEGAL_REQUEST, 0x10, ascq); |
a73c2a2f SG |
833 | scsi_set_sense_information(sc->sense_buffer, |
834 | SCSI_SENSE_BUFFERSIZE, | |
835 | sector); | |
55e51eda SG |
836 | goto out; |
837 | } | |
838 | } | |
839 | ||
7996a778 MC |
840 | if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) { |
841 | sc->result = DID_ERROR << 16; | |
842 | goto out; | |
843 | } | |
844 | ||
845 | if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) { | |
9b80cb4b | 846 | uint16_t senselen; |
7996a778 MC |
847 | |
848 | if (datalen < 2) { | |
849 | invalid_datalen: | |
322d739d MC |
850 | iscsi_conn_printk(KERN_ERR, conn, |
851 | "Got CHECK_CONDITION but invalid data " | |
852 | "buffer size of %d\n", datalen); | |
7996a778 MC |
853 | sc->result = DID_BAD_TARGET << 16; |
854 | goto out; | |
855 | } | |
856 | ||
8f333991 | 857 | senselen = get_unaligned_be16(data); |
7996a778 MC |
858 | if (datalen < senselen) |
859 | goto invalid_datalen; | |
860 | ||
861 | memcpy(sc->sense_buffer, data + 2, | |
9b80cb4b | 862 | min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE)); |
1b2c7af8 MC |
863 | ISCSI_DBG_SESSION(session, "copied %d bytes of sense\n", |
864 | min_t(uint16_t, senselen, | |
865 | SCSI_SENSE_BUFFERSIZE)); | |
7996a778 MC |
866 | } |
867 | ||
c07d4444 BH |
868 | if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW | |
869 | ISCSI_FLAG_CMD_BIDI_OVERFLOW)) { | |
ae3d56d8 | 870 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; |
c07d4444 BH |
871 | } |
872 | ||
7207fea4 BH |
873 | if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW | |
874 | ISCSI_FLAG_CMD_OVERFLOW)) { | |
7996a778 MC |
875 | int res_count = be32_to_cpu(rhdr->residual_count); |
876 | ||
7207fea4 BH |
877 | if (res_count > 0 && |
878 | (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || | |
879 | res_count <= scsi_bufflen(sc))) | |
c07d4444 | 880 | /* write side for bidi or uni-io set_resid */ |
1c138991 | 881 | scsi_set_resid(sc, res_count); |
7996a778 MC |
882 | else |
883 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
c07d4444 | 884 | } |
7996a778 | 885 | out: |
3bbaaad9 | 886 | ISCSI_DBG_SESSION(session, "cmd rsp done [sc %p res %d itt 0x%x]\n", |
1b2c7af8 | 887 | sc, sc->result, task->itt); |
7996a778 | 888 | conn->scsirsp_pdus_cnt++; |
b3cd5050 | 889 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); |
7996a778 MC |
890 | } |
891 | ||
1d9edf02 MC |
892 | /** |
893 | * iscsi_data_in_rsp - SCSI Data-In Response processing | |
894 | * @conn: iscsi connection | |
895 | * @hdr: iscsi pdu | |
896 | * @task: scsi command task | |
a656183e LD |
897 | * |
898 | * iscsi_data_in_rsp sets up the scsi_cmnd fields based on the data received | |
899 | * then completes the command and task. called under back_lock | |
1d9edf02 MC |
900 | **/ |
901 | static void | |
902 | iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
903 | struct iscsi_task *task) | |
904 | { | |
905 | struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)hdr; | |
906 | struct scsi_cmnd *sc = task->sc; | |
907 | ||
908 | if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS)) | |
909 | return; | |
910 | ||
edbc9aa0 | 911 | iscsi_update_cmdsn(conn->session, (struct iscsi_nopin *)hdr); |
1d9edf02 MC |
912 | sc->result = (DID_OK << 16) | rhdr->cmd_status; |
913 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; | |
914 | if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW | | |
915 | ISCSI_FLAG_DATA_OVERFLOW)) { | |
916 | int res_count = be32_to_cpu(rhdr->residual_count); | |
917 | ||
918 | if (res_count > 0 && | |
919 | (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || | |
ae3d56d8 | 920 | res_count <= sc->sdb.length)) |
960bf87a | 921 | scsi_set_resid(sc, res_count); |
1d9edf02 MC |
922 | else |
923 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
924 | } | |
925 | ||
3bbaaad9 MC |
926 | ISCSI_DBG_SESSION(conn->session, "data in with status done " |
927 | "[sc %p res %d itt 0x%x]\n", | |
928 | sc, sc->result, task->itt); | |
1d9edf02 | 929 | conn->scsirsp_pdus_cnt++; |
b3cd5050 | 930 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); |
1d9edf02 MC |
931 | } |
932 | ||
7ea8b828 MC |
933 | static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr) |
934 | { | |
935 | struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr; | |
ec29d0ac | 936 | struct iscsi_session *session = conn->session; |
7ea8b828 MC |
937 | |
938 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
939 | conn->tmfrsp_pdus_cnt++; | |
940 | ||
ec29d0ac | 941 | if (session->tmf_state != TMF_QUEUED) |
7ea8b828 MC |
942 | return; |
943 | ||
944 | if (tmf->response == ISCSI_TMF_RSP_COMPLETE) | |
ec29d0ac | 945 | session->tmf_state = TMF_SUCCESS; |
7ea8b828 | 946 | else if (tmf->response == ISCSI_TMF_RSP_NO_TASK) |
ec29d0ac | 947 | session->tmf_state = TMF_NOT_FOUND; |
7ea8b828 | 948 | else |
ec29d0ac MC |
949 | session->tmf_state = TMF_FAILED; |
950 | wake_up(&session->ehwait); | |
7ea8b828 MC |
951 | } |
952 | ||
52f5664a | 953 | static int iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr) |
f6d5180c MC |
954 | { |
955 | struct iscsi_nopout hdr; | |
9c19a7d0 | 956 | struct iscsi_task *task; |
f6d5180c | 957 | |
fe0a8a95 LD |
958 | if (!rhdr) { |
959 | if (READ_ONCE(conn->ping_task)) | |
960 | return -EINVAL; | |
961 | WRITE_ONCE(conn->ping_task, INVALID_SCSI_TASK); | |
962 | } | |
f6d5180c MC |
963 | |
964 | memset(&hdr, 0, sizeof(struct iscsi_nopout)); | |
965 | hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE; | |
966 | hdr.flags = ISCSI_FLAG_CMD_FINAL; | |
967 | ||
968 | if (rhdr) { | |
55bdabdf | 969 | hdr.lun = rhdr->lun; |
f6d5180c MC |
970 | hdr.ttt = rhdr->ttt; |
971 | hdr.itt = RESERVED_ITT; | |
972 | } else | |
973 | hdr.ttt = RESERVED_ITT; | |
974 | ||
9c19a7d0 | 975 | task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0); |
52f5664a | 976 | if (!task) { |
fe0a8a95 LD |
977 | if (!rhdr) |
978 | WRITE_ONCE(conn->ping_task, NULL); | |
322d739d | 979 | iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n"); |
52f5664a AN |
980 | return -EIO; |
981 | } else if (!rhdr) { | |
d3acf022 | 982 | /* only track our nops */ |
d3acf022 MC |
983 | conn->last_ping = jiffies; |
984 | } | |
52f5664a AN |
985 | |
986 | return 0; | |
f6d5180c MC |
987 | } |
988 | ||
a656183e LD |
989 | /** |
990 | * iscsi_nop_out_rsp - SCSI NOP Response processing | |
991 | * @task: scsi command task | |
992 | * @nop: the nop structure | |
993 | * @data: where to put the data | |
994 | * @datalen: length of data | |
995 | * | |
996 | * iscsi_nop_out_rsp handles nop response from use or | |
997 | * from user space. called under back_lock | |
998 | **/ | |
8afa1439 MC |
999 | static int iscsi_nop_out_rsp(struct iscsi_task *task, |
1000 | struct iscsi_nopin *nop, char *data, int datalen) | |
1001 | { | |
1002 | struct iscsi_conn *conn = task->conn; | |
1003 | int rc = 0; | |
1004 | ||
fe0a8a95 | 1005 | if (READ_ONCE(conn->ping_task) != task) { |
8afa1439 MC |
1006 | /* |
1007 | * If this is not in response to one of our | |
1008 | * nops then it must be from userspace. | |
1009 | */ | |
1010 | if (iscsi_recv_pdu(conn->cls_conn, (struct iscsi_hdr *)nop, | |
1011 | data, datalen)) | |
1012 | rc = ISCSI_ERR_CONN_FAILED; | |
1013 | } else | |
1014 | mod_timer(&conn->transport_timer, jiffies + conn->recv_timeout); | |
1015 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); | |
1016 | return rc; | |
1017 | } | |
1018 | ||
62f38300 MC |
1019 | static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
1020 | char *data, int datalen) | |
1021 | { | |
1022 | struct iscsi_reject *reject = (struct iscsi_reject *)hdr; | |
1023 | struct iscsi_hdr rejected_pdu; | |
8afa1439 | 1024 | int opcode, rc = 0; |
62f38300 MC |
1025 | |
1026 | conn->exp_statsn = be32_to_cpu(reject->statsn) + 1; | |
1027 | ||
8afa1439 MC |
1028 | if (ntoh24(reject->dlength) > datalen || |
1029 | ntoh24(reject->dlength) < sizeof(struct iscsi_hdr)) { | |
1030 | iscsi_conn_printk(KERN_ERR, conn, "Cannot handle rejected " | |
1031 | "pdu. Invalid data length (pdu dlength " | |
1032 | "%u, datalen %d\n", ntoh24(reject->dlength), | |
1033 | datalen); | |
1034 | return ISCSI_ERR_PROTO; | |
1035 | } | |
1036 | memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr)); | |
1037 | opcode = rejected_pdu.opcode & ISCSI_OPCODE_MASK; | |
1038 | ||
1039 | switch (reject->reason) { | |
1040 | case ISCSI_REASON_DATA_DIGEST_ERROR: | |
1041 | iscsi_conn_printk(KERN_ERR, conn, | |
1042 | "pdu (op 0x%x itt 0x%x) rejected " | |
1043 | "due to DataDigest error.\n", | |
e5dbbe27 | 1044 | opcode, rejected_pdu.itt); |
8afa1439 MC |
1045 | break; |
1046 | case ISCSI_REASON_IMM_CMD_REJECT: | |
1047 | iscsi_conn_printk(KERN_ERR, conn, | |
1048 | "pdu (op 0x%x itt 0x%x) rejected. Too many " | |
1049 | "immediate commands.\n", | |
e5dbbe27 | 1050 | opcode, rejected_pdu.itt); |
8afa1439 MC |
1051 | /* |
1052 | * We only send one TMF at a time so if the target could not | |
1053 | * handle it, then it should get fixed (RFC mandates that | |
1054 | * a target can handle one immediate TMF per conn). | |
1055 | * | |
1056 | * For nops-outs, we could have sent more than one if | |
1057 | * the target is sending us lots of nop-ins | |
1058 | */ | |
1059 | if (opcode != ISCSI_OP_NOOP_OUT) | |
1060 | return 0; | |
62f38300 | 1061 | |
4dec6a8f | 1062 | if (rejected_pdu.itt == cpu_to_be32(ISCSI_RESERVED_TAG)) { |
8afa1439 MC |
1063 | /* |
1064 | * nop-out in response to target's nop-out rejected. | |
1065 | * Just resend. | |
1066 | */ | |
659743b0 SP |
1067 | /* In RX path we are under back lock */ |
1068 | spin_unlock(&conn->session->back_lock); | |
1069 | spin_lock(&conn->session->frwd_lock); | |
8afa1439 MC |
1070 | iscsi_send_nopout(conn, |
1071 | (struct iscsi_nopin*)&rejected_pdu); | |
659743b0 SP |
1072 | spin_unlock(&conn->session->frwd_lock); |
1073 | spin_lock(&conn->session->back_lock); | |
1074 | } else { | |
8afa1439 MC |
1075 | struct iscsi_task *task; |
1076 | /* | |
1077 | * Our nop as ping got dropped. We know the target | |
1078 | * and transport are ok so just clean up | |
1079 | */ | |
1080 | task = iscsi_itt_to_task(conn, rejected_pdu.itt); | |
1081 | if (!task) { | |
1082 | iscsi_conn_printk(KERN_ERR, conn, | |
1083 | "Invalid pdu reject. Could " | |
1084 | "not lookup rejected task.\n"); | |
1085 | rc = ISCSI_ERR_BAD_ITT; | |
1086 | } else | |
1087 | rc = iscsi_nop_out_rsp(task, | |
1088 | (struct iscsi_nopin*)&rejected_pdu, | |
1089 | NULL, 0); | |
62f38300 | 1090 | } |
8afa1439 MC |
1091 | break; |
1092 | default: | |
1093 | iscsi_conn_printk(KERN_ERR, conn, | |
1094 | "pdu (op 0x%x itt 0x%x) rejected. Reason " | |
e5dbbe27 VC |
1095 | "code 0x%x\n", rejected_pdu.opcode, |
1096 | rejected_pdu.itt, reject->reason); | |
8afa1439 | 1097 | break; |
62f38300 | 1098 | } |
8afa1439 | 1099 | return rc; |
62f38300 MC |
1100 | } |
1101 | ||
913e5bf4 MC |
1102 | /** |
1103 | * iscsi_itt_to_task - look up task by itt | |
1104 | * @conn: iscsi connection | |
1105 | * @itt: itt | |
1106 | * | |
1107 | * This should be used for mgmt tasks like login and nops, or if | |
1108 | * the LDD's itt space does not include the session age. | |
1109 | * | |
659743b0 | 1110 | * The session back_lock must be held. |
913e5bf4 | 1111 | */ |
8f9256ce | 1112 | struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *conn, itt_t itt) |
913e5bf4 MC |
1113 | { |
1114 | struct iscsi_session *session = conn->session; | |
262ef636 | 1115 | int i; |
913e5bf4 MC |
1116 | |
1117 | if (itt == RESERVED_ITT) | |
1118 | return NULL; | |
1119 | ||
262ef636 MC |
1120 | if (session->tt->parse_pdu_itt) |
1121 | session->tt->parse_pdu_itt(conn, itt, &i, NULL); | |
1122 | else | |
1123 | i = get_itt(itt); | |
913e5bf4 MC |
1124 | if (i >= session->cmds_max) |
1125 | return NULL; | |
1126 | ||
1127 | return session->cmds[i]; | |
1128 | } | |
8f9256ce | 1129 | EXPORT_SYMBOL_GPL(iscsi_itt_to_task); |
913e5bf4 | 1130 | |
7996a778 MC |
1131 | /** |
1132 | * __iscsi_complete_pdu - complete pdu | |
1133 | * @conn: iscsi conn | |
1134 | * @hdr: iscsi header | |
1135 | * @data: data buffer | |
1136 | * @datalen: len of data buffer | |
1137 | * | |
1138 | * Completes pdu processing by freeing any resources allocated at | |
659743b0 | 1139 | * queuecommand or send generic. session back_lock must be held and verify |
7996a778 MC |
1140 | * itt must have been called. |
1141 | */ | |
913e5bf4 MC |
1142 | int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
1143 | char *data, int datalen) | |
7996a778 MC |
1144 | { |
1145 | struct iscsi_session *session = conn->session; | |
1146 | int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0; | |
9c19a7d0 | 1147 | struct iscsi_task *task; |
7996a778 MC |
1148 | uint32_t itt; |
1149 | ||
f6d5180c | 1150 | conn->last_recv = jiffies; |
0af967f5 MC |
1151 | rc = iscsi_verify_itt(conn, hdr->itt); |
1152 | if (rc) | |
1153 | return rc; | |
1154 | ||
b4377356 AV |
1155 | if (hdr->itt != RESERVED_ITT) |
1156 | itt = get_itt(hdr->itt); | |
7996a778 | 1157 | else |
b4377356 | 1158 | itt = ~0U; |
7996a778 | 1159 | |
1b2c7af8 MC |
1160 | ISCSI_DBG_SESSION(session, "[op 0x%x cid %d itt 0x%x len %d]\n", |
1161 | opcode, conn->id, itt, datalen); | |
7996a778 | 1162 | |
3e5c28ad | 1163 | if (itt == ~0U) { |
77a23c21 | 1164 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); |
62f38300 | 1165 | |
7996a778 MC |
1166 | switch(opcode) { |
1167 | case ISCSI_OP_NOOP_IN: | |
40527afe | 1168 | if (datalen) { |
7996a778 | 1169 | rc = ISCSI_ERR_PROTO; |
40527afe MC |
1170 | break; |
1171 | } | |
1172 | ||
b4377356 | 1173 | if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG)) |
40527afe MC |
1174 | break; |
1175 | ||
659743b0 SP |
1176 | /* In RX path we are under back lock */ |
1177 | spin_unlock(&session->back_lock); | |
1178 | spin_lock(&session->frwd_lock); | |
f6d5180c | 1179 | iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr); |
659743b0 SP |
1180 | spin_unlock(&session->frwd_lock); |
1181 | spin_lock(&session->back_lock); | |
7996a778 MC |
1182 | break; |
1183 | case ISCSI_OP_REJECT: | |
62f38300 MC |
1184 | rc = iscsi_handle_reject(conn, hdr, data, datalen); |
1185 | break; | |
7996a778 | 1186 | case ISCSI_OP_ASYNC_EVENT: |
8d2860b3 | 1187 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; |
5831c737 MC |
1188 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) |
1189 | rc = ISCSI_ERR_CONN_FAILED; | |
7996a778 MC |
1190 | break; |
1191 | default: | |
1192 | rc = ISCSI_ERR_BAD_OPCODE; | |
1193 | break; | |
1194 | } | |
3e5c28ad MC |
1195 | goto out; |
1196 | } | |
1197 | ||
3e5c28ad MC |
1198 | switch(opcode) { |
1199 | case ISCSI_OP_SCSI_CMD_RSP: | |
913e5bf4 MC |
1200 | case ISCSI_OP_SCSI_DATA_IN: |
1201 | task = iscsi_itt_to_ctask(conn, hdr->itt); | |
1202 | if (!task) | |
1203 | return ISCSI_ERR_BAD_ITT; | |
d355e57d | 1204 | task->last_xfer = jiffies; |
913e5bf4 MC |
1205 | break; |
1206 | case ISCSI_OP_R2T: | |
1207 | /* | |
1208 | * LLD handles R2Ts if they need to. | |
1209 | */ | |
1210 | return 0; | |
1211 | case ISCSI_OP_LOGOUT_RSP: | |
1212 | case ISCSI_OP_LOGIN_RSP: | |
1213 | case ISCSI_OP_TEXT_RSP: | |
1214 | case ISCSI_OP_SCSI_TMFUNC_RSP: | |
1215 | case ISCSI_OP_NOOP_IN: | |
1216 | task = iscsi_itt_to_task(conn, hdr->itt); | |
1217 | if (!task) | |
1218 | return ISCSI_ERR_BAD_ITT; | |
1219 | break; | |
1220 | default: | |
1221 | return ISCSI_ERR_BAD_OPCODE; | |
1222 | } | |
1223 | ||
1224 | switch(opcode) { | |
1225 | case ISCSI_OP_SCSI_CMD_RSP: | |
9c19a7d0 | 1226 | iscsi_scsi_cmd_rsp(conn, hdr, task, data, datalen); |
3e5c28ad MC |
1227 | break; |
1228 | case ISCSI_OP_SCSI_DATA_IN: | |
1d9edf02 | 1229 | iscsi_data_in_rsp(conn, hdr, task); |
3e5c28ad | 1230 | break; |
3e5c28ad MC |
1231 | case ISCSI_OP_LOGOUT_RSP: |
1232 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
1233 | if (datalen) { | |
1234 | rc = ISCSI_ERR_PROTO; | |
1235 | break; | |
1236 | } | |
1237 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
1238 | goto recv_pdu; | |
1239 | case ISCSI_OP_LOGIN_RSP: | |
1240 | case ISCSI_OP_TEXT_RSP: | |
1241 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
1242 | /* | |
1243 | * login related PDU's exp_statsn is handled in | |
1244 | * userspace | |
1245 | */ | |
1246 | goto recv_pdu; | |
1247 | case ISCSI_OP_SCSI_TMFUNC_RSP: | |
1248 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
1249 | if (datalen) { | |
1250 | rc = ISCSI_ERR_PROTO; | |
1251 | break; | |
1252 | } | |
1253 | ||
1254 | iscsi_tmf_rsp(conn, hdr); | |
b3cd5050 | 1255 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); |
3e5c28ad MC |
1256 | break; |
1257 | case ISCSI_OP_NOOP_IN: | |
1258 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
1259 | if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) { | |
1260 | rc = ISCSI_ERR_PROTO; | |
1261 | break; | |
1262 | } | |
1263 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
1264 | ||
8afa1439 MC |
1265 | rc = iscsi_nop_out_rsp(task, (struct iscsi_nopin*)hdr, |
1266 | data, datalen); | |
3e5c28ad MC |
1267 | break; |
1268 | default: | |
1269 | rc = ISCSI_ERR_BAD_OPCODE; | |
1270 | break; | |
1271 | } | |
7996a778 | 1272 | |
3e5c28ad MC |
1273 | out: |
1274 | return rc; | |
1275 | recv_pdu: | |
1276 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) | |
1277 | rc = ISCSI_ERR_CONN_FAILED; | |
b3cd5050 | 1278 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); |
7996a778 MC |
1279 | return rc; |
1280 | } | |
913e5bf4 | 1281 | EXPORT_SYMBOL_GPL(__iscsi_complete_pdu); |
7996a778 MC |
1282 | |
1283 | int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
1284 | char *data, int datalen) | |
1285 | { | |
1286 | int rc; | |
1287 | ||
659743b0 | 1288 | spin_lock(&conn->session->back_lock); |
7996a778 | 1289 | rc = __iscsi_complete_pdu(conn, hdr, data, datalen); |
659743b0 | 1290 | spin_unlock(&conn->session->back_lock); |
7996a778 MC |
1291 | return rc; |
1292 | } | |
1293 | EXPORT_SYMBOL_GPL(iscsi_complete_pdu); | |
1294 | ||
0af967f5 | 1295 | int iscsi_verify_itt(struct iscsi_conn *conn, itt_t itt) |
7996a778 MC |
1296 | { |
1297 | struct iscsi_session *session = conn->session; | |
262ef636 | 1298 | int age = 0, i = 0; |
7996a778 | 1299 | |
0af967f5 MC |
1300 | if (itt == RESERVED_ITT) |
1301 | return 0; | |
7996a778 | 1302 | |
262ef636 MC |
1303 | if (session->tt->parse_pdu_itt) |
1304 | session->tt->parse_pdu_itt(conn, itt, &i, &age); | |
1305 | else { | |
1306 | i = get_itt(itt); | |
1307 | age = ((__force u32)itt >> ISCSI_AGE_SHIFT) & ISCSI_AGE_MASK; | |
1308 | } | |
1309 | ||
1310 | if (age != session->age) { | |
0af967f5 MC |
1311 | iscsi_conn_printk(KERN_ERR, conn, |
1312 | "received itt %x expected session age (%x)\n", | |
913e5bf4 | 1313 | (__force u32)itt, session->age); |
0af967f5 MC |
1314 | return ISCSI_ERR_BAD_ITT; |
1315 | } | |
7996a778 | 1316 | |
3e5c28ad MC |
1317 | if (i >= session->cmds_max) { |
1318 | iscsi_conn_printk(KERN_ERR, conn, | |
1319 | "received invalid itt index %u (max cmds " | |
1320 | "%u.\n", i, session->cmds_max); | |
1321 | return ISCSI_ERR_BAD_ITT; | |
7996a778 | 1322 | } |
7996a778 MC |
1323 | return 0; |
1324 | } | |
1325 | EXPORT_SYMBOL_GPL(iscsi_verify_itt); | |
1326 | ||
913e5bf4 MC |
1327 | /** |
1328 | * iscsi_itt_to_ctask - look up ctask by itt | |
1329 | * @conn: iscsi connection | |
1330 | * @itt: itt | |
1331 | * | |
1332 | * This should be used for cmd tasks. | |
1333 | * | |
659743b0 | 1334 | * The session back_lock must be held. |
913e5bf4 MC |
1335 | */ |
1336 | struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *conn, itt_t itt) | |
0af967f5 | 1337 | { |
9c19a7d0 | 1338 | struct iscsi_task *task; |
0af967f5 MC |
1339 | |
1340 | if (iscsi_verify_itt(conn, itt)) | |
1341 | return NULL; | |
1342 | ||
913e5bf4 MC |
1343 | task = iscsi_itt_to_task(conn, itt); |
1344 | if (!task || !task->sc) | |
0af967f5 MC |
1345 | return NULL; |
1346 | ||
db22de3e | 1347 | if (iscsi_cmd(task->sc)->age != conn->session->age) { |
913e5bf4 MC |
1348 | iscsi_session_printk(KERN_ERR, conn->session, |
1349 | "task's session age %d, expected %d\n", | |
db22de3e | 1350 | iscsi_cmd(task->sc)->age, conn->session->age); |
0af967f5 | 1351 | return NULL; |
913e5bf4 | 1352 | } |
0af967f5 | 1353 | |
9c19a7d0 | 1354 | return task; |
0af967f5 MC |
1355 | } |
1356 | EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask); | |
1357 | ||
40a06e75 | 1358 | void iscsi_session_failure(struct iscsi_session *session, |
e5bd7b54 MC |
1359 | enum iscsi_err err) |
1360 | { | |
e5bd7b54 | 1361 | struct iscsi_conn *conn; |
e5bd7b54 | 1362 | |
659743b0 | 1363 | spin_lock_bh(&session->frwd_lock); |
e5bd7b54 MC |
1364 | conn = session->leadconn; |
1365 | if (session->state == ISCSI_STATE_TERMINATE || !conn) { | |
659743b0 | 1366 | spin_unlock_bh(&session->frwd_lock); |
e5bd7b54 MC |
1367 | return; |
1368 | } | |
1369 | ||
b1d19e8c | 1370 | iscsi_get_conn(conn->cls_conn); |
659743b0 | 1371 | spin_unlock_bh(&session->frwd_lock); |
e5bd7b54 MC |
1372 | /* |
1373 | * if the host is being removed bypass the connection | |
1374 | * recovery initialization because we are going to kill | |
1375 | * the session. | |
1376 | */ | |
1377 | if (err == ISCSI_ERR_INVALID_HOST) | |
1378 | iscsi_conn_error_event(conn->cls_conn, err); | |
1379 | else | |
1380 | iscsi_conn_failure(conn, err); | |
b1d19e8c | 1381 | iscsi_put_conn(conn->cls_conn); |
e5bd7b54 MC |
1382 | } |
1383 | EXPORT_SYMBOL_GPL(iscsi_session_failure); | |
1384 | ||
891e2639 | 1385 | static bool iscsi_set_conn_failed(struct iscsi_conn *conn) |
7996a778 MC |
1386 | { |
1387 | struct iscsi_session *session = conn->session; | |
7996a778 | 1388 | |
891e2639 MC |
1389 | if (session->state == ISCSI_STATE_FAILED) |
1390 | return false; | |
656cffc9 | 1391 | |
67a61114 | 1392 | if (conn->stop_stage == 0) |
7996a778 | 1393 | session->state = ISCSI_STATE_FAILED; |
e5bd7b54 | 1394 | |
7996a778 MC |
1395 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); |
1396 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
891e2639 MC |
1397 | return true; |
1398 | } | |
1399 | ||
1400 | void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err) | |
1401 | { | |
1402 | struct iscsi_session *session = conn->session; | |
1403 | bool needs_evt; | |
1404 | ||
1405 | spin_lock_bh(&session->frwd_lock); | |
1406 | needs_evt = iscsi_set_conn_failed(conn); | |
1407 | spin_unlock_bh(&session->frwd_lock); | |
1408 | ||
1409 | if (needs_evt) | |
1410 | iscsi_conn_error_event(conn->cls_conn, err); | |
7996a778 MC |
1411 | } |
1412 | EXPORT_SYMBOL_GPL(iscsi_conn_failure); | |
1413 | ||
77a23c21 MC |
1414 | static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn) |
1415 | { | |
1416 | struct iscsi_session *session = conn->session; | |
1417 | ||
1418 | /* | |
1419 | * Check for iSCSI window and take care of CmdSN wrap-around | |
1420 | */ | |
e0726407 | 1421 | if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) { |
1b2c7af8 MC |
1422 | ISCSI_DBG_SESSION(session, "iSCSI CmdSN closed. ExpCmdSn " |
1423 | "%u MaxCmdSN %u CmdSN %u/%u\n", | |
1424 | session->exp_cmdsn, session->max_cmdsn, | |
1425 | session->cmdsn, session->queued_cmdsn); | |
77a23c21 MC |
1426 | return -ENOSPC; |
1427 | } | |
1428 | return 0; | |
1429 | } | |
1430 | ||
5923d64b MC |
1431 | static int iscsi_xmit_task(struct iscsi_conn *conn, struct iscsi_task *task, |
1432 | bool was_requeue) | |
77a23c21 | 1433 | { |
843c0a8a | 1434 | int rc; |
77a23c21 | 1435 | |
79edd00d | 1436 | spin_lock_bh(&conn->session->back_lock); |
5923d64b MC |
1437 | |
1438 | if (!conn->task) { | |
1439 | /* Take a ref so we can access it after xmit_task() */ | |
1440 | __iscsi_get_task(task); | |
1441 | } else { | |
1442 | /* Already have a ref from when we failed to send it last call */ | |
1443 | conn->task = NULL; | |
1444 | } | |
1445 | ||
1446 | /* | |
1447 | * If this was a requeue for a R2T we have an extra ref on the task in | |
1448 | * case a bad target sends a cmd rsp before we have handled the task. | |
1449 | */ | |
1450 | if (was_requeue) | |
1451 | __iscsi_put_task(task); | |
1452 | ||
1453 | /* | |
1454 | * Do this after dropping the extra ref because if this was a requeue | |
1455 | * it's removed from that list and cleanup_queued_task would miss it. | |
1456 | */ | |
1457 | if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) { | |
1458 | /* | |
1459 | * Save the task and ref in case we weren't cleaning up this | |
1460 | * task and get woken up again. | |
1461 | */ | |
1462 | conn->task = task; | |
79edd00d AS |
1463 | spin_unlock_bh(&conn->session->back_lock); |
1464 | return -ENODATA; | |
1465 | } | |
79edd00d | 1466 | spin_unlock_bh(&conn->session->back_lock); |
5923d64b | 1467 | |
659743b0 | 1468 | spin_unlock_bh(&conn->session->frwd_lock); |
9c19a7d0 | 1469 | rc = conn->session->tt->xmit_task(task); |
659743b0 | 1470 | spin_lock_bh(&conn->session->frwd_lock); |
d355e57d | 1471 | if (!rc) { |
9c19a7d0 | 1472 | /* done with this task */ |
d355e57d | 1473 | task->last_xfer = jiffies; |
d355e57d | 1474 | } |
659743b0 | 1475 | /* regular RX path uses back_lock */ |
72b97402 | 1476 | spin_lock(&conn->session->back_lock); |
5923d64b MC |
1477 | if (rc && task->state == ISCSI_TASK_RUNNING) { |
1478 | /* | |
1479 | * get an extra ref that is released next time we access it | |
1480 | * as conn->task above. | |
1481 | */ | |
1482 | __iscsi_get_task(task); | |
1483 | conn->task = task; | |
1484 | } | |
1485 | ||
d355e57d | 1486 | __iscsi_put_task(task); |
72b97402 | 1487 | spin_unlock(&conn->session->back_lock); |
77a23c21 MC |
1488 | return rc; |
1489 | } | |
1490 | ||
843c0a8a | 1491 | /** |
9c19a7d0 MC |
1492 | * iscsi_requeue_task - requeue task to run from session workqueue |
1493 | * @task: task to requeue | |
843c0a8a | 1494 | * |
5923d64b | 1495 | * Callers must have taken a ref to the task that is going to be requeued. |
843c0a8a | 1496 | */ |
9c19a7d0 | 1497 | void iscsi_requeue_task(struct iscsi_task *task) |
843c0a8a | 1498 | { |
9c19a7d0 | 1499 | struct iscsi_conn *conn = task->conn; |
843c0a8a | 1500 | |
3bbaaad9 MC |
1501 | /* |
1502 | * this may be on the requeue list already if the xmit_task callout | |
1503 | * is handling the r2ts while we are adding new ones | |
1504 | */ | |
5923d64b MC |
1505 | spin_lock_bh(&conn->session->frwd_lock); |
1506 | if (list_empty(&task->running)) { | |
3bbaaad9 | 1507 | list_add_tail(&task->running, &conn->requeue); |
5923d64b MC |
1508 | } else { |
1509 | /* | |
1510 | * Don't need the extra ref since it's already requeued and | |
1511 | * has a ref. | |
1512 | */ | |
1513 | iscsi_put_task(task); | |
1514 | } | |
32ae763e | 1515 | iscsi_conn_queue_work(conn); |
5923d64b | 1516 | spin_unlock_bh(&conn->session->frwd_lock); |
843c0a8a | 1517 | } |
9c19a7d0 | 1518 | EXPORT_SYMBOL_GPL(iscsi_requeue_task); |
843c0a8a | 1519 | |
7996a778 MC |
1520 | /** |
1521 | * iscsi_data_xmit - xmit any command into the scheduled connection | |
1522 | * @conn: iscsi connection | |
1523 | * | |
1524 | * Notes: | |
1525 | * The function can return -EAGAIN in which case the caller must | |
1526 | * re-schedule it again later or recover. '0' return code means | |
1527 | * successful xmit. | |
1528 | **/ | |
1529 | static int iscsi_data_xmit(struct iscsi_conn *conn) | |
1530 | { | |
5d12c05e | 1531 | struct iscsi_task *task; |
3219e529 | 1532 | int rc = 0; |
7996a778 | 1533 | |
659743b0 | 1534 | spin_lock_bh(&conn->session->frwd_lock); |
70b31c15 | 1535 | if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) { |
1b2c7af8 | 1536 | ISCSI_DBG_SESSION(conn->session, "Tx suspended!\n"); |
659743b0 | 1537 | spin_unlock_bh(&conn->session->frwd_lock); |
3219e529 | 1538 | return -ENODATA; |
7996a778 | 1539 | } |
7996a778 | 1540 | |
9c19a7d0 | 1541 | if (conn->task) { |
5923d64b | 1542 | rc = iscsi_xmit_task(conn, conn->task, false); |
3219e529 | 1543 | if (rc) |
70b31c15 | 1544 | goto done; |
7996a778 MC |
1545 | } |
1546 | ||
77a23c21 MC |
1547 | /* |
1548 | * process mgmt pdus like nops before commands since we should | |
1549 | * only have one nop-out as a ping from us and targets should not | |
1550 | * overflow us with nop-ins | |
1551 | */ | |
1552 | check_mgmt: | |
843c0a8a | 1553 | while (!list_empty(&conn->mgmtqueue)) { |
5923d64b MC |
1554 | task = list_entry(conn->mgmtqueue.next, struct iscsi_task, |
1555 | running); | |
1556 | list_del_init(&task->running); | |
1557 | if (iscsi_prep_mgmt_task(conn, task)) { | |
659743b0 SP |
1558 | /* regular RX path uses back_lock */ |
1559 | spin_lock_bh(&conn->session->back_lock); | |
5923d64b | 1560 | __iscsi_put_task(task); |
659743b0 | 1561 | spin_unlock_bh(&conn->session->back_lock); |
b3a7ea8d MC |
1562 | continue; |
1563 | } | |
5923d64b | 1564 | rc = iscsi_xmit_task(conn, task, false); |
77a23c21 | 1565 | if (rc) |
70b31c15 | 1566 | goto done; |
7996a778 MC |
1567 | } |
1568 | ||
843c0a8a | 1569 | /* process pending command queue */ |
3bbaaad9 | 1570 | while (!list_empty(&conn->cmdqueue)) { |
5923d64b MC |
1571 | task = list_entry(conn->cmdqueue.next, struct iscsi_task, |
1572 | running); | |
1573 | list_del_init(&task->running); | |
b3a7ea8d | 1574 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) { |
5923d64b | 1575 | fail_scsi_task(task, DID_IMM_RETRY); |
b3a7ea8d MC |
1576 | continue; |
1577 | } | |
5923d64b | 1578 | rc = iscsi_prep_scsi_cmd_pdu(task); |
577577da | 1579 | if (rc) { |
d28d48c6 | 1580 | if (rc == -ENOMEM || rc == -EACCES) |
5923d64b | 1581 | fail_scsi_task(task, DID_IMM_RETRY); |
d28d48c6 | 1582 | else |
5923d64b | 1583 | fail_scsi_task(task, DID_ABORT); |
004d6530 BH |
1584 | continue; |
1585 | } | |
5923d64b | 1586 | rc = iscsi_xmit_task(conn, task, false); |
77a23c21 | 1587 | if (rc) |
70b31c15 | 1588 | goto done; |
77a23c21 | 1589 | /* |
9c19a7d0 | 1590 | * we could continuously get new task requests so |
77a23c21 MC |
1591 | * we need to check the mgmt queue for nops that need to |
1592 | * be sent to aviod starvation | |
1593 | */ | |
843c0a8a MC |
1594 | if (!list_empty(&conn->mgmtqueue)) |
1595 | goto check_mgmt; | |
1596 | } | |
1597 | ||
1598 | while (!list_empty(&conn->requeue)) { | |
b3a7ea8d MC |
1599 | /* |
1600 | * we always do fastlogout - conn stop code will clean up. | |
1601 | */ | |
1602 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) | |
1603 | break; | |
1604 | ||
5d12c05e MC |
1605 | task = list_entry(conn->requeue.next, struct iscsi_task, |
1606 | running); | |
5923d64b | 1607 | |
5d12c05e MC |
1608 | if (iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_DATA_OUT)) |
1609 | break; | |
1610 | ||
5923d64b MC |
1611 | list_del_init(&task->running); |
1612 | rc = iscsi_xmit_task(conn, task, true); | |
843c0a8a | 1613 | if (rc) |
70b31c15 | 1614 | goto done; |
843c0a8a | 1615 | if (!list_empty(&conn->mgmtqueue)) |
77a23c21 | 1616 | goto check_mgmt; |
7996a778 | 1617 | } |
659743b0 | 1618 | spin_unlock_bh(&conn->session->frwd_lock); |
3219e529 | 1619 | return -ENODATA; |
7996a778 | 1620 | |
70b31c15 | 1621 | done: |
659743b0 | 1622 | spin_unlock_bh(&conn->session->frwd_lock); |
3219e529 | 1623 | return rc; |
7996a778 MC |
1624 | } |
1625 | ||
c4028958 | 1626 | static void iscsi_xmitworker(struct work_struct *work) |
7996a778 | 1627 | { |
c4028958 DH |
1628 | struct iscsi_conn *conn = |
1629 | container_of(work, struct iscsi_conn, xmitwork); | |
3219e529 | 1630 | int rc; |
7996a778 MC |
1631 | /* |
1632 | * serialize Xmit worker on a per-connection basis. | |
1633 | */ | |
3219e529 MC |
1634 | do { |
1635 | rc = iscsi_data_xmit(conn); | |
1636 | } while (rc >= 0 || rc == -EAGAIN); | |
7996a778 MC |
1637 | } |
1638 | ||
577577da MC |
1639 | static inline struct iscsi_task *iscsi_alloc_task(struct iscsi_conn *conn, |
1640 | struct scsi_cmnd *sc) | |
1641 | { | |
1642 | struct iscsi_task *task; | |
1643 | ||
7acd72eb | 1644 | if (!kfifo_out(&conn->session->cmdpool.queue, |
577577da MC |
1645 | (void *) &task, sizeof(void *))) |
1646 | return NULL; | |
1647 | ||
db22de3e BVA |
1648 | iscsi_cmd(sc)->age = conn->session->age; |
1649 | iscsi_cmd(sc)->task = task; | |
577577da | 1650 | |
6dc618cd | 1651 | refcount_set(&task->refcount, 1); |
577577da MC |
1652 | task->state = ISCSI_TASK_PENDING; |
1653 | task->conn = conn; | |
1654 | task->sc = sc; | |
d355e57d MC |
1655 | task->have_checked_conn = false; |
1656 | task->last_timeout = jiffies; | |
1657 | task->last_xfer = jiffies; | |
55e51eda | 1658 | task->protected = false; |
577577da MC |
1659 | INIT_LIST_HEAD(&task->running); |
1660 | return task; | |
1661 | } | |
1662 | ||
7996a778 MC |
1663 | enum { |
1664 | FAILURE_BAD_HOST = 1, | |
1665 | FAILURE_SESSION_FAILED, | |
1666 | FAILURE_SESSION_FREED, | |
1667 | FAILURE_WINDOW_CLOSED, | |
60ecebf5 | 1668 | FAILURE_OOM, |
7996a778 | 1669 | FAILURE_SESSION_TERMINATE, |
656cffc9 | 1670 | FAILURE_SESSION_IN_RECOVERY, |
7996a778 | 1671 | FAILURE_SESSION_RECOVERY_TIMEOUT, |
b3a7ea8d | 1672 | FAILURE_SESSION_LOGGING_OUT, |
6eabafbe | 1673 | FAILURE_SESSION_NOT_READY, |
7996a778 MC |
1674 | }; |
1675 | ||
f41d4721 | 1676 | int iscsi_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc) |
7996a778 | 1677 | { |
75613521 | 1678 | struct iscsi_cls_session *cls_session; |
1336aed1 | 1679 | struct iscsi_host *ihost; |
7996a778 MC |
1680 | int reason = 0; |
1681 | struct iscsi_session *session; | |
1682 | struct iscsi_conn *conn; | |
9c19a7d0 | 1683 | struct iscsi_task *task = NULL; |
7996a778 | 1684 | |
7996a778 | 1685 | sc->result = 0; |
db22de3e | 1686 | iscsi_cmd(sc)->task = NULL; |
7996a778 | 1687 | |
1336aed1 | 1688 | ihost = shost_priv(host); |
7996a778 | 1689 | |
75613521 MC |
1690 | cls_session = starget_to_session(scsi_target(sc->device)); |
1691 | session = cls_session->dd_data; | |
659743b0 | 1692 | spin_lock_bh(&session->frwd_lock); |
7996a778 | 1693 | |
75613521 | 1694 | reason = iscsi_session_chkready(cls_session); |
6eabafbe MC |
1695 | if (reason) { |
1696 | sc->result = reason; | |
1697 | goto fault; | |
1698 | } | |
1699 | ||
301e0f7e | 1700 | if (session->state != ISCSI_STATE_LOGGED_IN) { |
656cffc9 MC |
1701 | /* |
1702 | * to handle the race between when we set the recovery state | |
1703 | * and block the session we requeue here (commands could | |
1704 | * be entering our queuecommand while a block is starting | |
1705 | * up because the block code is not locked) | |
1706 | */ | |
9000bcd6 | 1707 | switch (session->state) { |
301e0f7e | 1708 | case ISCSI_STATE_FAILED: |
d7549412 RDT |
1709 | /* |
1710 | * cmds should fail during shutdown, if the session | |
1711 | * state is bad, allowing completion to happen | |
1712 | */ | |
1713 | if (unlikely(system_state != SYSTEM_RUNNING)) { | |
1714 | reason = FAILURE_SESSION_FAILED; | |
1715 | sc->result = DID_NO_CONNECT << 16; | |
1716 | break; | |
1717 | } | |
df561f66 | 1718 | fallthrough; |
9000bcd6 | 1719 | case ISCSI_STATE_IN_RECOVERY: |
656cffc9 | 1720 | reason = FAILURE_SESSION_IN_RECOVERY; |
301e0f7e MC |
1721 | sc->result = DID_IMM_RETRY << 16; |
1722 | break; | |
9000bcd6 MC |
1723 | case ISCSI_STATE_LOGGING_OUT: |
1724 | reason = FAILURE_SESSION_LOGGING_OUT; | |
301e0f7e MC |
1725 | sc->result = DID_IMM_RETRY << 16; |
1726 | break; | |
b3a7ea8d | 1727 | case ISCSI_STATE_RECOVERY_FAILED: |
656cffc9 | 1728 | reason = FAILURE_SESSION_RECOVERY_TIMEOUT; |
56d7fcfa | 1729 | sc->result = DID_TRANSPORT_FAILFAST << 16; |
b3a7ea8d MC |
1730 | break; |
1731 | case ISCSI_STATE_TERMINATE: | |
656cffc9 | 1732 | reason = FAILURE_SESSION_TERMINATE; |
6eabafbe | 1733 | sc->result = DID_NO_CONNECT << 16; |
b3a7ea8d | 1734 | break; |
b3a7ea8d | 1735 | default: |
656cffc9 | 1736 | reason = FAILURE_SESSION_FREED; |
6eabafbe | 1737 | sc->result = DID_NO_CONNECT << 16; |
b3a7ea8d | 1738 | } |
7996a778 MC |
1739 | goto fault; |
1740 | } | |
1741 | ||
7996a778 | 1742 | conn = session->leadconn; |
98644047 MC |
1743 | if (!conn) { |
1744 | reason = FAILURE_SESSION_FREED; | |
6eabafbe | 1745 | sc->result = DID_NO_CONNECT << 16; |
98644047 MC |
1746 | goto fault; |
1747 | } | |
7996a778 | 1748 | |
661134ad MC |
1749 | if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) { |
1750 | reason = FAILURE_SESSION_IN_RECOVERY; | |
eef9ffdf | 1751 | sc->result = DID_REQUEUE << 16; |
661134ad MC |
1752 | goto fault; |
1753 | } | |
1754 | ||
77a23c21 MC |
1755 | if (iscsi_check_cmdsn_window_closed(conn)) { |
1756 | reason = FAILURE_WINDOW_CLOSED; | |
1757 | goto reject; | |
1758 | } | |
1759 | ||
577577da MC |
1760 | task = iscsi_alloc_task(conn, sc); |
1761 | if (!task) { | |
60ecebf5 MC |
1762 | reason = FAILURE_OOM; |
1763 | goto reject; | |
1764 | } | |
7996a778 | 1765 | |
1336aed1 | 1766 | if (!ihost->workq) { |
577577da MC |
1767 | reason = iscsi_prep_scsi_cmd_pdu(task); |
1768 | if (reason) { | |
5d12c05e | 1769 | if (reason == -ENOMEM || reason == -EACCES) { |
577577da MC |
1770 | reason = FAILURE_OOM; |
1771 | goto prepd_reject; | |
1772 | } else { | |
1773 | sc->result = DID_ABORT << 16; | |
1774 | goto prepd_fault; | |
1775 | } | |
052d0144 | 1776 | } |
9c19a7d0 | 1777 | if (session->tt->xmit_task(task)) { |
d3305f34 | 1778 | session->cmdsn--; |
052d0144 | 1779 | reason = FAILURE_SESSION_NOT_READY; |
577577da | 1780 | goto prepd_reject; |
052d0144 | 1781 | } |
3bbaaad9 MC |
1782 | } else { |
1783 | list_add_tail(&task->running, &conn->cmdqueue); | |
32ae763e | 1784 | iscsi_conn_queue_work(conn); |
3bbaaad9 | 1785 | } |
052d0144 MC |
1786 | |
1787 | session->queued_cmdsn++; | |
659743b0 | 1788 | spin_unlock_bh(&session->frwd_lock); |
7996a778 MC |
1789 | return 0; |
1790 | ||
577577da | 1791 | prepd_reject: |
a656183e | 1792 | spin_lock_bh(&session->back_lock); |
f41d4721 | 1793 | iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ); |
a656183e | 1794 | spin_unlock_bh(&session->back_lock); |
7996a778 | 1795 | reject: |
659743b0 | 1796 | spin_unlock_bh(&session->frwd_lock); |
1b2c7af8 MC |
1797 | ISCSI_DBG_SESSION(session, "cmd 0x%x rejected (%d)\n", |
1798 | sc->cmnd[0], reason); | |
d6d13ee1 | 1799 | return SCSI_MLQUEUE_TARGET_BUSY; |
7996a778 | 1800 | |
577577da | 1801 | prepd_fault: |
a656183e | 1802 | spin_lock_bh(&session->back_lock); |
f41d4721 | 1803 | iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ); |
a656183e | 1804 | spin_unlock_bh(&session->back_lock); |
7996a778 | 1805 | fault: |
659743b0 | 1806 | spin_unlock_bh(&session->frwd_lock); |
1b2c7af8 MC |
1807 | ISCSI_DBG_SESSION(session, "iscsi: cmd 0x%x is not queued (%d)\n", |
1808 | sc->cmnd[0], reason); | |
ae3d56d8 | 1809 | scsi_set_resid(sc, scsi_bufflen(sc)); |
b4b84edc | 1810 | scsi_done(sc); |
7996a778 MC |
1811 | return 0; |
1812 | } | |
1813 | EXPORT_SYMBOL_GPL(iscsi_queuecommand); | |
1814 | ||
6b5d6c44 MC |
1815 | int iscsi_target_alloc(struct scsi_target *starget) |
1816 | { | |
1817 | struct iscsi_cls_session *cls_session = starget_to_session(starget); | |
1818 | struct iscsi_session *session = cls_session->dd_data; | |
1819 | ||
1820 | starget->can_queue = session->scsi_cmds_max; | |
1821 | return 0; | |
1822 | } | |
1823 | EXPORT_SYMBOL_GPL(iscsi_target_alloc); | |
1824 | ||
2c4b9637 | 1825 | static void iscsi_tmf_timedout(struct timer_list *t) |
7996a778 | 1826 | { |
ec29d0ac | 1827 | struct iscsi_session *session = from_timer(session, t, tmf_timer); |
7996a778 | 1828 | |
659743b0 | 1829 | spin_lock(&session->frwd_lock); |
ec29d0ac MC |
1830 | if (session->tmf_state == TMF_QUEUED) { |
1831 | session->tmf_state = TMF_TIMEDOUT; | |
bd2199d4 | 1832 | ISCSI_DBG_EH(session, "tmf timedout\n"); |
7996a778 | 1833 | /* unblock eh_abort() */ |
ec29d0ac | 1834 | wake_up(&session->ehwait); |
7996a778 | 1835 | } |
659743b0 | 1836 | spin_unlock(&session->frwd_lock); |
7996a778 MC |
1837 | } |
1838 | ||
9c19a7d0 | 1839 | static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn, |
f6d5180c MC |
1840 | struct iscsi_tm *hdr, int age, |
1841 | int timeout) | |
1360c58a | 1842 | __must_hold(&session->frwd_lock) |
7996a778 | 1843 | { |
7996a778 | 1844 | struct iscsi_session *session = conn->session; |
9c19a7d0 | 1845 | struct iscsi_task *task; |
7996a778 | 1846 | |
9c19a7d0 | 1847 | task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr, |
843c0a8a | 1848 | NULL, 0); |
9c19a7d0 | 1849 | if (!task) { |
659743b0 | 1850 | spin_unlock_bh(&session->frwd_lock); |
df4da5cd | 1851 | iscsi_conn_printk(KERN_ERR, conn, "Could not send TMF.\n"); |
7996a778 | 1852 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
659743b0 | 1853 | spin_lock_bh(&session->frwd_lock); |
77a23c21 | 1854 | return -EPERM; |
7996a778 | 1855 | } |
843c0a8a | 1856 | conn->tmfcmd_pdus_cnt++; |
ec29d0ac MC |
1857 | session->tmf_timer.expires = timeout * HZ + jiffies; |
1858 | add_timer(&session->tmf_timer); | |
bd2199d4 | 1859 | ISCSI_DBG_EH(session, "tmf set timeout\n"); |
7996a778 | 1860 | |
659743b0 | 1861 | spin_unlock_bh(&session->frwd_lock); |
6724add1 | 1862 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1863 | |
1864 | /* | |
1865 | * block eh thread until: | |
1866 | * | |
843c0a8a MC |
1867 | * 1) tmf response |
1868 | * 2) tmf timeout | |
7996a778 MC |
1869 | * 3) session is terminated or restarted or userspace has |
1870 | * given up on recovery | |
1871 | */ | |
ec29d0ac | 1872 | wait_event_interruptible(session->ehwait, age != session->age || |
7996a778 | 1873 | session->state != ISCSI_STATE_LOGGED_IN || |
ec29d0ac | 1874 | session->tmf_state != TMF_QUEUED); |
7996a778 MC |
1875 | if (signal_pending(current)) |
1876 | flush_signals(current); | |
ec29d0ac | 1877 | del_timer_sync(&session->tmf_timer); |
843c0a8a | 1878 | |
6724add1 | 1879 | mutex_lock(&session->eh_mutex); |
659743b0 | 1880 | spin_lock_bh(&session->frwd_lock); |
9c19a7d0 | 1881 | /* if the session drops it will clean up the task */ |
843c0a8a MC |
1882 | if (age != session->age || |
1883 | session->state != ISCSI_STATE_LOGGED_IN) | |
1884 | return -ENOTCONN; | |
7996a778 MC |
1885 | return 0; |
1886 | } | |
1887 | ||
843c0a8a | 1888 | /* |
14936b1e | 1889 | * Fail commands. session frwd lock held and xmit thread flushed. |
843c0a8a | 1890 | */ |
9cb78c16 | 1891 | static void fail_scsi_tasks(struct iscsi_conn *conn, u64 lun, int error) |
843c0a8a | 1892 | { |
14936b1e | 1893 | struct iscsi_session *session = conn->session; |
3bbaaad9 MC |
1894 | struct iscsi_task *task; |
1895 | int i; | |
843c0a8a | 1896 | |
14936b1e MC |
1897 | spin_lock_bh(&session->back_lock); |
1898 | for (i = 0; i < session->cmds_max; i++) { | |
1899 | task = session->cmds[i]; | |
3bbaaad9 MC |
1900 | if (!task->sc || task->state == ISCSI_TASK_FREE) |
1901 | continue; | |
843c0a8a | 1902 | |
3bbaaad9 MC |
1903 | if (lun != -1 && lun != task->sc->device->lun) |
1904 | continue; | |
843c0a8a | 1905 | |
14936b1e MC |
1906 | __iscsi_get_task(task); |
1907 | spin_unlock_bh(&session->back_lock); | |
1908 | ||
1909 | ISCSI_DBG_SESSION(session, | |
3bbaaad9 MC |
1910 | "failing sc %p itt 0x%x state %d\n", |
1911 | task->sc, task->itt, task->state); | |
b3cd5050 | 1912 | fail_scsi_task(task, error); |
14936b1e MC |
1913 | |
1914 | spin_unlock_bh(&session->frwd_lock); | |
1915 | iscsi_put_task(task); | |
1916 | spin_lock_bh(&session->frwd_lock); | |
1917 | ||
1918 | spin_lock_bh(&session->back_lock); | |
843c0a8a | 1919 | } |
14936b1e MC |
1920 | |
1921 | spin_unlock_bh(&session->back_lock); | |
843c0a8a MC |
1922 | } |
1923 | ||
661134ad MC |
1924 | /** |
1925 | * iscsi_suspend_queue - suspend iscsi_queuecommand | |
1926 | * @conn: iscsi conn to stop queueing IO on | |
1927 | * | |
659743b0 | 1928 | * This grabs the session frwd_lock to make sure no one is in |
661134ad MC |
1929 | * xmit_task/queuecommand, and then sets suspend to prevent |
1930 | * new commands from being queued. This only needs to be called | |
1931 | * by offload drivers that need to sync a path like ep disconnect | |
1932 | * with the iscsi_queuecommand/xmit_task. To start IO again libiscsi | |
1933 | * will call iscsi_start_tx and iscsi_unblock_session when in FFP. | |
1934 | */ | |
1935 | void iscsi_suspend_queue(struct iscsi_conn *conn) | |
1936 | { | |
659743b0 | 1937 | spin_lock_bh(&conn->session->frwd_lock); |
661134ad | 1938 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); |
659743b0 | 1939 | spin_unlock_bh(&conn->session->frwd_lock); |
661134ad MC |
1940 | } |
1941 | EXPORT_SYMBOL_GPL(iscsi_suspend_queue); | |
1942 | ||
1943 | /** | |
1944 | * iscsi_suspend_tx - suspend iscsi_data_xmit | |
1945 | * @conn: iscsi conn tp stop processing IO on. | |
1946 | * | |
1947 | * This function sets the suspend bit to prevent iscsi_data_xmit | |
1948 | * from sending new IO, and if work is queued on the xmit thread | |
1949 | * it will wait for it to be completed. | |
1950 | */ | |
b40977d9 | 1951 | void iscsi_suspend_tx(struct iscsi_conn *conn) |
6724add1 | 1952 | { |
32ae763e MC |
1953 | struct Scsi_Host *shost = conn->session->host; |
1954 | struct iscsi_host *ihost = shost_priv(shost); | |
1955 | ||
6724add1 | 1956 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); |
1336aed1 | 1957 | if (ihost->workq) |
32ae763e | 1958 | flush_workqueue(ihost->workq); |
6724add1 | 1959 | } |
b40977d9 | 1960 | EXPORT_SYMBOL_GPL(iscsi_suspend_tx); |
6724add1 MC |
1961 | |
1962 | static void iscsi_start_tx(struct iscsi_conn *conn) | |
1963 | { | |
1964 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
1336aed1 | 1965 | iscsi_conn_queue_work(conn); |
6724add1 MC |
1966 | } |
1967 | ||
4c48a829 MC |
1968 | /* |
1969 | * We want to make sure a ping is in flight. It has timed out. | |
1970 | * And we are not busy processing a pdu that is making | |
1971 | * progress but got started before the ping and is taking a while | |
1972 | * to complete so the ping is just stuck behind it in a queue. | |
1973 | */ | |
1974 | static int iscsi_has_ping_timed_out(struct iscsi_conn *conn) | |
1975 | { | |
fe0a8a95 | 1976 | if (READ_ONCE(conn->ping_task) && |
4c48a829 MC |
1977 | time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) + |
1978 | (conn->ping_timeout * HZ), jiffies)) | |
1979 | return 1; | |
1980 | else | |
1981 | return 0; | |
1982 | } | |
1983 | ||
b6a05c82 | 1984 | enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *sc) |
f6d5180c | 1985 | { |
6600593c | 1986 | enum blk_eh_timer_return rc = BLK_EH_DONE; |
92ed4d69 | 1987 | struct iscsi_task *task = NULL, *running_task; |
f6d5180c MC |
1988 | struct iscsi_cls_session *cls_session; |
1989 | struct iscsi_session *session; | |
1990 | struct iscsi_conn *conn; | |
92ed4d69 | 1991 | int i; |
f6d5180c | 1992 | |
d355e57d | 1993 | cls_session = starget_to_session(scsi_target(sc->device)); |
75613521 | 1994 | session = cls_session->dd_data; |
f6d5180c | 1995 | |
bd2199d4 | 1996 | ISCSI_DBG_EH(session, "scsi cmd %p timedout\n", sc); |
f6d5180c | 1997 | |
5480e299 | 1998 | spin_lock_bh(&session->frwd_lock); |
14936b1e | 1999 | spin_lock(&session->back_lock); |
db22de3e | 2000 | task = iscsi_cmd(sc)->task; |
e3d338a5 MC |
2001 | if (!task) { |
2002 | /* | |
2003 | * Raced with completion. Blk layer has taken ownership | |
2004 | * so let timeout code complete it now. | |
2005 | */ | |
adb2b769 | 2006 | rc = BLK_EH_DONE; |
14936b1e | 2007 | spin_unlock(&session->back_lock); |
e3d338a5 MC |
2008 | goto done; |
2009 | } | |
14936b1e MC |
2010 | __iscsi_get_task(task); |
2011 | spin_unlock(&session->back_lock); | |
e3d338a5 | 2012 | |
f6d5180c | 2013 | if (session->state != ISCSI_STATE_LOGGED_IN) { |
d7549412 RDT |
2014 | /* |
2015 | * During shutdown, if session is prematurely disconnected, | |
2016 | * recovery won't happen and there will be hung cmds. Not | |
2017 | * handling cmds would trigger EH, also bad in this case. | |
2018 | * Instead, handle cmd, allow completion to happen and let | |
2019 | * upper layer to deal with the result. | |
2020 | */ | |
2021 | if (unlikely(system_state != SYSTEM_RUNNING)) { | |
2022 | sc->result = DID_NO_CONNECT << 16; | |
2023 | ISCSI_DBG_EH(session, "sc on shutdown, handled\n"); | |
adb2b769 | 2024 | rc = BLK_EH_DONE; |
d7549412 RDT |
2025 | goto done; |
2026 | } | |
f6d5180c MC |
2027 | /* |
2028 | * We are probably in the middle of iscsi recovery so let | |
2029 | * that complete and handle the error. | |
2030 | */ | |
242f9dcb | 2031 | rc = BLK_EH_RESET_TIMER; |
f6d5180c MC |
2032 | goto done; |
2033 | } | |
2034 | ||
2035 | conn = session->leadconn; | |
2036 | if (!conn) { | |
2037 | /* In the middle of shuting down */ | |
242f9dcb | 2038 | rc = BLK_EH_RESET_TIMER; |
f6d5180c MC |
2039 | goto done; |
2040 | } | |
2041 | ||
d355e57d MC |
2042 | /* |
2043 | * If we have sent (at least queued to the network layer) a pdu or | |
2044 | * recvd one for the task since the last timeout ask for | |
2045 | * more time. If on the next timeout we have not made progress | |
2046 | * we can check if it is the task or connection when we send the | |
2047 | * nop as a ping. | |
2048 | */ | |
92ed4d69 | 2049 | if (time_after(task->last_xfer, task->last_timeout)) { |
bd2199d4 EZ |
2050 | ISCSI_DBG_EH(session, "Command making progress. Asking " |
2051 | "scsi-ml for more time to complete. " | |
92ed4d69 | 2052 | "Last data xfer at %lu. Last timeout was at " |
bd2199d4 | 2053 | "%lu\n.", task->last_xfer, task->last_timeout); |
d355e57d MC |
2054 | task->have_checked_conn = false; |
2055 | rc = BLK_EH_RESET_TIMER; | |
2056 | goto done; | |
2057 | } | |
2058 | ||
f6d5180c MC |
2059 | if (!conn->recv_timeout && !conn->ping_timeout) |
2060 | goto done; | |
2061 | /* | |
2062 | * if the ping timedout then we are in the middle of cleaning up | |
2063 | * and can let the iscsi eh handle it | |
2064 | */ | |
4c48a829 | 2065 | if (iscsi_has_ping_timed_out(conn)) { |
242f9dcb | 2066 | rc = BLK_EH_RESET_TIMER; |
4c48a829 MC |
2067 | goto done; |
2068 | } | |
d355e57d | 2069 | |
14936b1e | 2070 | spin_lock(&session->back_lock); |
92ed4d69 MC |
2071 | for (i = 0; i < conn->session->cmds_max; i++) { |
2072 | running_task = conn->session->cmds[i]; | |
2073 | if (!running_task->sc || running_task == task || | |
2074 | running_task->state != ISCSI_TASK_RUNNING) | |
2075 | continue; | |
2076 | ||
2077 | /* | |
2078 | * Only check if cmds started before this one have made | |
2079 | * progress, or this could never fail | |
2080 | */ | |
2081 | if (time_after(running_task->sc->jiffies_at_alloc, | |
2082 | task->sc->jiffies_at_alloc)) | |
2083 | continue; | |
2084 | ||
2085 | if (time_after(running_task->last_xfer, task->last_timeout)) { | |
2086 | /* | |
2087 | * This task has not made progress, but a task | |
2088 | * started before us has transferred data since | |
2089 | * we started/last-checked. We could be queueing | |
2090 | * too many tasks or the LU is bad. | |
2091 | * | |
2092 | * If the device is bad the cmds ahead of us on | |
2093 | * other devs will complete, and this loop will | |
2094 | * eventually fail starting the scsi eh. | |
2095 | */ | |
2096 | ISCSI_DBG_EH(session, "Command has not made progress " | |
2097 | "but commands ahead of it have. " | |
2098 | "Asking scsi-ml for more time to " | |
2099 | "complete. Our last xfer vs running task " | |
2100 | "last xfer %lu/%lu. Last check %lu.\n", | |
2101 | task->last_xfer, running_task->last_xfer, | |
2102 | task->last_timeout); | |
14936b1e | 2103 | spin_unlock(&session->back_lock); |
92ed4d69 MC |
2104 | rc = BLK_EH_RESET_TIMER; |
2105 | goto done; | |
2106 | } | |
2107 | } | |
14936b1e | 2108 | spin_unlock(&session->back_lock); |
92ed4d69 | 2109 | |
d355e57d MC |
2110 | /* Assumes nop timeout is shorter than scsi cmd timeout */ |
2111 | if (task->have_checked_conn) | |
2112 | goto done; | |
2113 | ||
f6d5180c | 2114 | /* |
d355e57d MC |
2115 | * Checking the transport already or nop from a cmd timeout still |
2116 | * running | |
f6d5180c | 2117 | */ |
fe0a8a95 | 2118 | if (READ_ONCE(conn->ping_task)) { |
d355e57d | 2119 | task->have_checked_conn = true; |
242f9dcb | 2120 | rc = BLK_EH_RESET_TIMER; |
4c48a829 MC |
2121 | goto done; |
2122 | } | |
2123 | ||
d355e57d MC |
2124 | /* Make sure there is a transport check done */ |
2125 | iscsi_send_nopout(conn, NULL); | |
2126 | task->have_checked_conn = true; | |
2127 | rc = BLK_EH_RESET_TIMER; | |
2128 | ||
f6d5180c | 2129 | done: |
5480e299 | 2130 | spin_unlock_bh(&session->frwd_lock); |
14936b1e MC |
2131 | |
2132 | if (task) { | |
2133 | task->last_timeout = jiffies; | |
2134 | iscsi_put_task(task); | |
2135 | } | |
bd2199d4 | 2136 | ISCSI_DBG_EH(session, "return %s\n", rc == BLK_EH_RESET_TIMER ? |
d7549412 | 2137 | "timer reset" : "shutdown or nh"); |
f6d5180c MC |
2138 | return rc; |
2139 | } | |
b6a05c82 | 2140 | EXPORT_SYMBOL_GPL(iscsi_eh_cmd_timed_out); |
f6d5180c | 2141 | |
2c4b9637 | 2142 | static void iscsi_check_transport_timeouts(struct timer_list *t) |
f6d5180c | 2143 | { |
2c4b9637 | 2144 | struct iscsi_conn *conn = from_timer(conn, t, transport_timer); |
f6d5180c | 2145 | struct iscsi_session *session = conn->session; |
4cf10435 | 2146 | unsigned long recv_timeout, next_timeout = 0, last_recv; |
f6d5180c | 2147 | |
659743b0 | 2148 | spin_lock(&session->frwd_lock); |
f6d5180c MC |
2149 | if (session->state != ISCSI_STATE_LOGGED_IN) |
2150 | goto done; | |
2151 | ||
4cf10435 MC |
2152 | recv_timeout = conn->recv_timeout; |
2153 | if (!recv_timeout) | |
f6d5180c MC |
2154 | goto done; |
2155 | ||
4cf10435 | 2156 | recv_timeout *= HZ; |
f6d5180c | 2157 | last_recv = conn->last_recv; |
4c48a829 MC |
2158 | |
2159 | if (iscsi_has_ping_timed_out(conn)) { | |
322d739d | 2160 | iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs " |
4c48a829 MC |
2161 | "expired, recv timeout %d, last rx %lu, " |
2162 | "last ping %lu, now %lu\n", | |
2163 | conn->ping_timeout, conn->recv_timeout, | |
2164 | last_recv, conn->last_ping, jiffies); | |
659743b0 | 2165 | spin_unlock(&session->frwd_lock); |
09ff742c | 2166 | iscsi_conn_failure(conn, ISCSI_ERR_NOP_TIMEDOUT); |
f6d5180c MC |
2167 | return; |
2168 | } | |
2169 | ||
4cf10435 | 2170 | if (time_before_eq(last_recv + recv_timeout, jiffies)) { |
c8611f97 | 2171 | /* send a ping to try to provoke some traffic */ |
1b2c7af8 | 2172 | ISCSI_DBG_CONN(conn, "Sending nopout as ping\n"); |
52f5664a AN |
2173 | if (iscsi_send_nopout(conn, NULL)) |
2174 | next_timeout = jiffies + (1 * HZ); | |
2175 | else | |
2176 | next_timeout = conn->last_ping + (conn->ping_timeout * HZ); | |
ad294e9c | 2177 | } else |
4cf10435 | 2178 | next_timeout = last_recv + recv_timeout; |
f6d5180c | 2179 | |
1b2c7af8 | 2180 | ISCSI_DBG_CONN(conn, "Setting next tmo %lu\n", next_timeout); |
ad294e9c | 2181 | mod_timer(&conn->transport_timer, next_timeout); |
f6d5180c | 2182 | done: |
659743b0 | 2183 | spin_unlock(&session->frwd_lock); |
f6d5180c MC |
2184 | } |
2185 | ||
891e2639 MC |
2186 | /** |
2187 | * iscsi_conn_unbind - prevent queueing to conn. | |
2188 | * @cls_conn: iscsi conn ep is bound to. | |
2189 | * @is_active: is the conn in use for boot or is this for EH/termination | |
2190 | * | |
2191 | * This must be called by drivers implementing the ep_disconnect callout. | |
2192 | * It disables queueing to the connection from libiscsi in preparation for | |
2193 | * an ep_disconnect call. | |
2194 | */ | |
2195 | void iscsi_conn_unbind(struct iscsi_cls_conn *cls_conn, bool is_active) | |
2196 | { | |
2197 | struct iscsi_session *session; | |
2198 | struct iscsi_conn *conn; | |
2199 | ||
2200 | if (!cls_conn) | |
2201 | return; | |
2202 | ||
2203 | conn = cls_conn->dd_data; | |
2204 | session = conn->session; | |
2205 | /* | |
2206 | * Wait for iscsi_eh calls to exit. We don't wait for the tmf to | |
2207 | * complete or timeout. The caller just wants to know what's running | |
2208 | * is everything that needs to be cleaned up, and no cmds will be | |
2209 | * queued. | |
2210 | */ | |
2211 | mutex_lock(&session->eh_mutex); | |
2212 | ||
2213 | iscsi_suspend_queue(conn); | |
2214 | iscsi_suspend_tx(conn); | |
2215 | ||
2216 | spin_lock_bh(&session->frwd_lock); | |
2217 | if (!is_active) { | |
2218 | /* | |
2219 | * if logout timed out before userspace could even send a PDU | |
2220 | * the state might still be in ISCSI_STATE_LOGGED_IN and | |
2221 | * allowing new cmds and TMFs. | |
2222 | */ | |
2223 | if (session->state == ISCSI_STATE_LOGGED_IN) | |
2224 | iscsi_set_conn_failed(conn); | |
2225 | } | |
2226 | spin_unlock_bh(&session->frwd_lock); | |
2227 | mutex_unlock(&session->eh_mutex); | |
2228 | } | |
2229 | EXPORT_SYMBOL_GPL(iscsi_conn_unbind); | |
2230 | ||
9c19a7d0 | 2231 | static void iscsi_prep_abort_task_pdu(struct iscsi_task *task, |
843c0a8a MC |
2232 | struct iscsi_tm *hdr) |
2233 | { | |
2234 | memset(hdr, 0, sizeof(*hdr)); | |
2235 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
2236 | hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK; | |
2237 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
55bdabdf | 2238 | hdr->lun = task->lun; |
577577da MC |
2239 | hdr->rtt = task->hdr_itt; |
2240 | hdr->refcmdsn = task->cmdsn; | |
843c0a8a MC |
2241 | } |
2242 | ||
7996a778 MC |
2243 | int iscsi_eh_abort(struct scsi_cmnd *sc) |
2244 | { | |
75613521 MC |
2245 | struct iscsi_cls_session *cls_session; |
2246 | struct iscsi_session *session; | |
f47f2cf5 | 2247 | struct iscsi_conn *conn; |
9c19a7d0 | 2248 | struct iscsi_task *task; |
843c0a8a | 2249 | struct iscsi_tm *hdr; |
e9e410e8 | 2250 | int age; |
7996a778 | 2251 | |
75613521 MC |
2252 | cls_session = starget_to_session(scsi_target(sc->device)); |
2253 | session = cls_session->dd_data; | |
2254 | ||
bd2199d4 | 2255 | ISCSI_DBG_EH(session, "aborting sc %p\n", sc); |
4421c9eb | 2256 | |
6724add1 | 2257 | mutex_lock(&session->eh_mutex); |
659743b0 | 2258 | spin_lock_bh(&session->frwd_lock); |
f47f2cf5 MC |
2259 | /* |
2260 | * if session was ISCSI_STATE_IN_RECOVERY then we may not have | |
2261 | * got the command. | |
2262 | */ | |
db22de3e | 2263 | if (!iscsi_cmd(sc)->task) { |
bd2199d4 EZ |
2264 | ISCSI_DBG_EH(session, "sc never reached iscsi layer or " |
2265 | "it completed.\n"); | |
659743b0 | 2266 | spin_unlock_bh(&session->frwd_lock); |
6724add1 | 2267 | mutex_unlock(&session->eh_mutex); |
f47f2cf5 MC |
2268 | return SUCCESS; |
2269 | } | |
2270 | ||
7996a778 MC |
2271 | /* |
2272 | * If we are not logged in or we have started a new session | |
2273 | * then let the host reset code handle this | |
2274 | */ | |
843c0a8a | 2275 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN || |
db22de3e | 2276 | iscsi_cmd(sc)->age != session->age) { |
659743b0 | 2277 | spin_unlock_bh(&session->frwd_lock); |
843c0a8a | 2278 | mutex_unlock(&session->eh_mutex); |
bd2199d4 | 2279 | ISCSI_DBG_EH(session, "failing abort due to dropped " |
4421c9eb | 2280 | "session.\n"); |
843c0a8a MC |
2281 | return FAILED; |
2282 | } | |
2283 | ||
14936b1e | 2284 | spin_lock(&session->back_lock); |
db22de3e | 2285 | task = iscsi_cmd(sc)->task; |
14936b1e MC |
2286 | if (!task || !task->sc) { |
2287 | /* task completed before time out */ | |
bd2199d4 | 2288 | ISCSI_DBG_EH(session, "sc completed while abort in progress\n"); |
14936b1e MC |
2289 | |
2290 | spin_unlock(&session->back_lock); | |
258aad75 MC |
2291 | spin_unlock_bh(&session->frwd_lock); |
2292 | mutex_unlock(&session->eh_mutex); | |
2293 | return SUCCESS; | |
7ea8b828 | 2294 | } |
258aad75 MC |
2295 | |
2296 | conn = session->leadconn; | |
2297 | iscsi_get_conn(conn->cls_conn); | |
2298 | conn->eh_abort_cnt++; | |
2299 | age = session->age; | |
2300 | ||
14936b1e MC |
2301 | ISCSI_DBG_EH(session, "aborting [sc %p itt 0x%x]\n", sc, task->itt); |
2302 | __iscsi_get_task(task); | |
2303 | spin_unlock(&session->back_lock); | |
7996a778 | 2304 | |
9c19a7d0 | 2305 | if (task->state == ISCSI_TASK_PENDING) { |
b3cd5050 | 2306 | fail_scsi_task(task, DID_ABORT); |
77a23c21 MC |
2307 | goto success; |
2308 | } | |
7996a778 | 2309 | |
843c0a8a | 2310 | /* only have one tmf outstanding at a time */ |
ec29d0ac | 2311 | if (session->tmf_state != TMF_INITIAL) |
7996a778 | 2312 | goto failed; |
ec29d0ac | 2313 | session->tmf_state = TMF_QUEUED; |
7996a778 | 2314 | |
ec29d0ac | 2315 | hdr = &session->tmhdr; |
9c19a7d0 | 2316 | iscsi_prep_abort_task_pdu(task, hdr); |
843c0a8a | 2317 | |
e9e410e8 | 2318 | if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout)) |
843c0a8a | 2319 | goto failed; |
843c0a8a | 2320 | |
ec29d0ac | 2321 | switch (session->tmf_state) { |
843c0a8a | 2322 | case TMF_SUCCESS: |
659743b0 | 2323 | spin_unlock_bh(&session->frwd_lock); |
913e5bf4 MC |
2324 | /* |
2325 | * stop tx side incase the target had sent a abort rsp but | |
2326 | * the initiator was still writing out data. | |
2327 | */ | |
6724add1 | 2328 | iscsi_suspend_tx(conn); |
77a23c21 | 2329 | /* |
913e5bf4 MC |
2330 | * we do not stop the recv side because targets have been |
2331 | * good and have never sent us a successful tmf response | |
2332 | * then sent more data for the cmd. | |
77a23c21 | 2333 | */ |
659743b0 | 2334 | spin_lock_bh(&session->frwd_lock); |
b3cd5050 | 2335 | fail_scsi_task(task, DID_ABORT); |
ec29d0ac | 2336 | session->tmf_state = TMF_INITIAL; |
5d12c05e | 2337 | memset(hdr, 0, sizeof(*hdr)); |
659743b0 | 2338 | spin_unlock_bh(&session->frwd_lock); |
6724add1 | 2339 | iscsi_start_tx(conn); |
77a23c21 | 2340 | goto success_unlocked; |
843c0a8a | 2341 | case TMF_TIMEDOUT: |
99b06033 | 2342 | session->running_aborted_task = task; |
659743b0 | 2343 | spin_unlock_bh(&session->frwd_lock); |
df4da5cd | 2344 | iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); |
843c0a8a MC |
2345 | goto failed_unlocked; |
2346 | case TMF_NOT_FOUND: | |
f6f96457 | 2347 | if (iscsi_task_is_completed(task)) { |
ec29d0ac | 2348 | session->tmf_state = TMF_INITIAL; |
5d12c05e | 2349 | memset(hdr, 0, sizeof(*hdr)); |
9c19a7d0 | 2350 | /* task completed before tmf abort response */ |
bd2199d4 EZ |
2351 | ISCSI_DBG_EH(session, "sc completed while abort in " |
2352 | "progress\n"); | |
77a23c21 | 2353 | goto success; |
7ea8b828 | 2354 | } |
df561f66 | 2355 | fallthrough; |
7ea8b828 | 2356 | default: |
ec29d0ac | 2357 | session->tmf_state = TMF_INITIAL; |
843c0a8a | 2358 | goto failed; |
7996a778 MC |
2359 | } |
2360 | ||
77a23c21 | 2361 | success: |
659743b0 | 2362 | spin_unlock_bh(&session->frwd_lock); |
77a23c21 | 2363 | success_unlocked: |
bd2199d4 EZ |
2364 | ISCSI_DBG_EH(session, "abort success [sc %p itt 0x%x]\n", |
2365 | sc, task->itt); | |
14936b1e | 2366 | iscsi_put_task(task); |
d39df158 | 2367 | iscsi_put_conn(conn->cls_conn); |
6724add1 | 2368 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
2369 | return SUCCESS; |
2370 | ||
2371 | failed: | |
659743b0 | 2372 | spin_unlock_bh(&session->frwd_lock); |
77a23c21 | 2373 | failed_unlocked: |
bd2199d4 EZ |
2374 | ISCSI_DBG_EH(session, "abort failed [sc %p itt 0x%x]\n", sc, |
2375 | task ? task->itt : 0); | |
99b06033 MC |
2376 | /* |
2377 | * The driver might be accessing the task so hold the ref. The conn | |
2378 | * stop cleanup will drop the ref after ep_disconnect so we know the | |
2379 | * driver's no longer touching the task. | |
2380 | */ | |
2381 | if (!session->running_aborted_task) | |
2382 | iscsi_put_task(task); | |
2383 | ||
d39df158 | 2384 | iscsi_put_conn(conn->cls_conn); |
6724add1 | 2385 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
2386 | return FAILED; |
2387 | } | |
2388 | EXPORT_SYMBOL_GPL(iscsi_eh_abort); | |
2389 | ||
843c0a8a MC |
2390 | static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr) |
2391 | { | |
2392 | memset(hdr, 0, sizeof(*hdr)); | |
2393 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
2394 | hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK; | |
2395 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
55bdabdf | 2396 | int_to_scsilun(sc->device->lun, &hdr->lun); |
f6d5180c | 2397 | hdr->rtt = RESERVED_ITT; |
843c0a8a MC |
2398 | } |
2399 | ||
2400 | int iscsi_eh_device_reset(struct scsi_cmnd *sc) | |
2401 | { | |
75613521 MC |
2402 | struct iscsi_cls_session *cls_session; |
2403 | struct iscsi_session *session; | |
843c0a8a MC |
2404 | struct iscsi_conn *conn; |
2405 | struct iscsi_tm *hdr; | |
2406 | int rc = FAILED; | |
2407 | ||
75613521 MC |
2408 | cls_session = starget_to_session(scsi_target(sc->device)); |
2409 | session = cls_session->dd_data; | |
2410 | ||
9cb78c16 HR |
2411 | ISCSI_DBG_EH(session, "LU Reset [sc %p lun %llu]\n", sc, |
2412 | sc->device->lun); | |
843c0a8a MC |
2413 | |
2414 | mutex_lock(&session->eh_mutex); | |
659743b0 | 2415 | spin_lock_bh(&session->frwd_lock); |
843c0a8a MC |
2416 | /* |
2417 | * Just check if we are not logged in. We cannot check for | |
2418 | * the phase because the reset could come from a ioctl. | |
2419 | */ | |
2420 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN) | |
2421 | goto unlock; | |
2422 | conn = session->leadconn; | |
2423 | ||
2424 | /* only have one tmf outstanding at a time */ | |
ec29d0ac | 2425 | if (session->tmf_state != TMF_INITIAL) |
843c0a8a | 2426 | goto unlock; |
ec29d0ac | 2427 | session->tmf_state = TMF_QUEUED; |
843c0a8a | 2428 | |
ec29d0ac | 2429 | hdr = &session->tmhdr; |
843c0a8a MC |
2430 | iscsi_prep_lun_reset_pdu(sc, hdr); |
2431 | ||
9c19a7d0 | 2432 | if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age, |
f6d5180c | 2433 | session->lu_reset_timeout)) { |
843c0a8a MC |
2434 | rc = FAILED; |
2435 | goto unlock; | |
2436 | } | |
2437 | ||
ec29d0ac | 2438 | switch (session->tmf_state) { |
843c0a8a MC |
2439 | case TMF_SUCCESS: |
2440 | break; | |
2441 | case TMF_TIMEDOUT: | |
659743b0 | 2442 | spin_unlock_bh(&session->frwd_lock); |
df4da5cd | 2443 | iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); |
843c0a8a MC |
2444 | goto done; |
2445 | default: | |
ec29d0ac | 2446 | session->tmf_state = TMF_INITIAL; |
843c0a8a MC |
2447 | goto unlock; |
2448 | } | |
2449 | ||
2450 | rc = SUCCESS; | |
659743b0 | 2451 | spin_unlock_bh(&session->frwd_lock); |
843c0a8a MC |
2452 | |
2453 | iscsi_suspend_tx(conn); | |
913e5bf4 | 2454 | |
659743b0 | 2455 | spin_lock_bh(&session->frwd_lock); |
5d12c05e | 2456 | memset(hdr, 0, sizeof(*hdr)); |
3bbaaad9 | 2457 | fail_scsi_tasks(conn, sc->device->lun, DID_ERROR); |
ec29d0ac | 2458 | session->tmf_state = TMF_INITIAL; |
659743b0 | 2459 | spin_unlock_bh(&session->frwd_lock); |
843c0a8a MC |
2460 | |
2461 | iscsi_start_tx(conn); | |
2462 | goto done; | |
2463 | ||
2464 | unlock: | |
659743b0 | 2465 | spin_unlock_bh(&session->frwd_lock); |
843c0a8a | 2466 | done: |
bd2199d4 EZ |
2467 | ISCSI_DBG_EH(session, "dev reset result = %s\n", |
2468 | rc == SUCCESS ? "SUCCESS" : "FAILED"); | |
843c0a8a MC |
2469 | mutex_unlock(&session->eh_mutex); |
2470 | return rc; | |
2471 | } | |
2472 | EXPORT_SYMBOL_GPL(iscsi_eh_device_reset); | |
2473 | ||
3fe5ae8b MC |
2474 | void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session) |
2475 | { | |
2476 | struct iscsi_session *session = cls_session->dd_data; | |
2477 | ||
659743b0 | 2478 | spin_lock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2479 | if (session->state != ISCSI_STATE_LOGGED_IN) { |
2480 | session->state = ISCSI_STATE_RECOVERY_FAILED; | |
ec29d0ac | 2481 | wake_up(&session->ehwait); |
3fe5ae8b | 2482 | } |
659743b0 | 2483 | spin_unlock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2484 | } |
2485 | EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout); | |
2486 | ||
2487 | /** | |
2488 | * iscsi_eh_session_reset - drop session and attempt relogin | |
2489 | * @sc: scsi command | |
2490 | * | |
2491 | * This function will wait for a relogin, session termination from | |
2492 | * userspace, or a recovery/replacement timeout. | |
2493 | */ | |
309ce156 | 2494 | int iscsi_eh_session_reset(struct scsi_cmnd *sc) |
3fe5ae8b MC |
2495 | { |
2496 | struct iscsi_cls_session *cls_session; | |
2497 | struct iscsi_session *session; | |
2498 | struct iscsi_conn *conn; | |
2499 | ||
2500 | cls_session = starget_to_session(scsi_target(sc->device)); | |
2501 | session = cls_session->dd_data; | |
3fe5ae8b MC |
2502 | |
2503 | mutex_lock(&session->eh_mutex); | |
659743b0 | 2504 | spin_lock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2505 | if (session->state == ISCSI_STATE_TERMINATE) { |
2506 | failed: | |
2507 | ISCSI_DBG_EH(session, | |
2508 | "failing session reset: Could not log back into " | |
5db6dd14 FH |
2509 | "%s [age %d]\n", session->targetname, |
2510 | session->age); | |
659743b0 | 2511 | spin_unlock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2512 | mutex_unlock(&session->eh_mutex); |
2513 | return FAILED; | |
2514 | } | |
2515 | ||
fda290c5 MC |
2516 | conn = session->leadconn; |
2517 | iscsi_get_conn(conn->cls_conn); | |
2518 | ||
659743b0 | 2519 | spin_unlock_bh(&session->frwd_lock); |
3fe5ae8b | 2520 | mutex_unlock(&session->eh_mutex); |
fda290c5 | 2521 | |
df4da5cd | 2522 | iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); |
fda290c5 | 2523 | iscsi_put_conn(conn->cls_conn); |
3fe5ae8b MC |
2524 | |
2525 | ISCSI_DBG_EH(session, "wait for relogin\n"); | |
ec29d0ac | 2526 | wait_event_interruptible(session->ehwait, |
3fe5ae8b MC |
2527 | session->state == ISCSI_STATE_TERMINATE || |
2528 | session->state == ISCSI_STATE_LOGGED_IN || | |
2529 | session->state == ISCSI_STATE_RECOVERY_FAILED); | |
2530 | if (signal_pending(current)) | |
2531 | flush_signals(current); | |
2532 | ||
2533 | mutex_lock(&session->eh_mutex); | |
659743b0 | 2534 | spin_lock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2535 | if (session->state == ISCSI_STATE_LOGGED_IN) { |
2536 | ISCSI_DBG_EH(session, | |
2537 | "session reset succeeded for %s,%s\n", | |
2538 | session->targetname, conn->persistent_address); | |
2539 | } else | |
2540 | goto failed; | |
659743b0 | 2541 | spin_unlock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2542 | mutex_unlock(&session->eh_mutex); |
2543 | return SUCCESS; | |
2544 | } | |
309ce156 | 2545 | EXPORT_SYMBOL_GPL(iscsi_eh_session_reset); |
3fe5ae8b MC |
2546 | |
2547 | static void iscsi_prep_tgt_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr) | |
2548 | { | |
2549 | memset(hdr, 0, sizeof(*hdr)); | |
2550 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
2551 | hdr->flags = ISCSI_TM_FUNC_TARGET_WARM_RESET & ISCSI_FLAG_TM_FUNC_MASK; | |
2552 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
2553 | hdr->rtt = RESERVED_ITT; | |
2554 | } | |
2555 | ||
2556 | /** | |
2557 | * iscsi_eh_target_reset - reset target | |
2558 | * @sc: scsi command | |
2559 | * | |
309ce156 | 2560 | * This will attempt to send a warm target reset. |
3fe5ae8b | 2561 | */ |
3907adf6 | 2562 | static int iscsi_eh_target_reset(struct scsi_cmnd *sc) |
3fe5ae8b MC |
2563 | { |
2564 | struct iscsi_cls_session *cls_session; | |
2565 | struct iscsi_session *session; | |
2566 | struct iscsi_conn *conn; | |
2567 | struct iscsi_tm *hdr; | |
2568 | int rc = FAILED; | |
2569 | ||
2570 | cls_session = starget_to_session(scsi_target(sc->device)); | |
2571 | session = cls_session->dd_data; | |
2572 | ||
2573 | ISCSI_DBG_EH(session, "tgt Reset [sc %p tgt %s]\n", sc, | |
2574 | session->targetname); | |
2575 | ||
2576 | mutex_lock(&session->eh_mutex); | |
659743b0 | 2577 | spin_lock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2578 | /* |
2579 | * Just check if we are not logged in. We cannot check for | |
2580 | * the phase because the reset could come from a ioctl. | |
2581 | */ | |
2582 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN) | |
2583 | goto unlock; | |
2584 | conn = session->leadconn; | |
2585 | ||
2586 | /* only have one tmf outstanding at a time */ | |
ec29d0ac | 2587 | if (session->tmf_state != TMF_INITIAL) |
3fe5ae8b | 2588 | goto unlock; |
ec29d0ac | 2589 | session->tmf_state = TMF_QUEUED; |
3fe5ae8b | 2590 | |
ec29d0ac | 2591 | hdr = &session->tmhdr; |
3fe5ae8b MC |
2592 | iscsi_prep_tgt_reset_pdu(sc, hdr); |
2593 | ||
2594 | if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age, | |
2595 | session->tgt_reset_timeout)) { | |
2596 | rc = FAILED; | |
2597 | goto unlock; | |
2598 | } | |
2599 | ||
ec29d0ac | 2600 | switch (session->tmf_state) { |
3fe5ae8b MC |
2601 | case TMF_SUCCESS: |
2602 | break; | |
2603 | case TMF_TIMEDOUT: | |
659743b0 | 2604 | spin_unlock_bh(&session->frwd_lock); |
df4da5cd | 2605 | iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); |
3fe5ae8b MC |
2606 | goto done; |
2607 | default: | |
ec29d0ac | 2608 | session->tmf_state = TMF_INITIAL; |
3fe5ae8b MC |
2609 | goto unlock; |
2610 | } | |
2611 | ||
2612 | rc = SUCCESS; | |
659743b0 | 2613 | spin_unlock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2614 | |
2615 | iscsi_suspend_tx(conn); | |
2616 | ||
659743b0 | 2617 | spin_lock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2618 | memset(hdr, 0, sizeof(*hdr)); |
2619 | fail_scsi_tasks(conn, -1, DID_ERROR); | |
ec29d0ac | 2620 | session->tmf_state = TMF_INITIAL; |
659743b0 | 2621 | spin_unlock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2622 | |
2623 | iscsi_start_tx(conn); | |
2624 | goto done; | |
2625 | ||
2626 | unlock: | |
659743b0 | 2627 | spin_unlock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2628 | done: |
2629 | ISCSI_DBG_EH(session, "tgt %s reset result = %s\n", session->targetname, | |
2630 | rc == SUCCESS ? "SUCCESS" : "FAILED"); | |
2631 | mutex_unlock(&session->eh_mutex); | |
309ce156 JK |
2632 | return rc; |
2633 | } | |
3fe5ae8b | 2634 | |
309ce156 JK |
2635 | /** |
2636 | * iscsi_eh_recover_target - reset target and possibly the session | |
2637 | * @sc: scsi command | |
2638 | * | |
2639 | * This will attempt to send a warm target reset. If that fails, | |
2640 | * we will escalate to ERL0 session recovery. | |
2641 | */ | |
2642 | int iscsi_eh_recover_target(struct scsi_cmnd *sc) | |
2643 | { | |
2644 | int rc; | |
2645 | ||
2646 | rc = iscsi_eh_target_reset(sc); | |
3fe5ae8b MC |
2647 | if (rc == FAILED) |
2648 | rc = iscsi_eh_session_reset(sc); | |
2649 | return rc; | |
2650 | } | |
309ce156 | 2651 | EXPORT_SYMBOL_GPL(iscsi_eh_recover_target); |
3fe5ae8b | 2652 | |
6320377f OK |
2653 | /* |
2654 | * Pre-allocate a pool of @max items of @item_size. By default, the pool | |
2655 | * should be accessed via kfifo_{get,put} on q->queue. | |
2656 | * Optionally, the caller can obtain the array of object pointers | |
2657 | * by passing in a non-NULL @items pointer | |
2658 | */ | |
7996a778 | 2659 | int |
6320377f | 2660 | iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size) |
7996a778 | 2661 | { |
6320377f | 2662 | int i, num_arrays = 1; |
7996a778 | 2663 | |
6320377f | 2664 | memset(q, 0, sizeof(*q)); |
7996a778 MC |
2665 | |
2666 | q->max = max; | |
6320377f OK |
2667 | |
2668 | /* If the user passed an items pointer, he wants a copy of | |
2669 | * the array. */ | |
2670 | if (items) | |
2671 | num_arrays++; | |
778e1cdd | 2672 | q->pool = kvcalloc(num_arrays * max, sizeof(void *), GFP_KERNEL); |
6320377f | 2673 | if (q->pool == NULL) |
f474a37b | 2674 | return -ENOMEM; |
7996a778 | 2675 | |
c1e13f25 | 2676 | kfifo_init(&q->queue, (void*)q->pool, max * sizeof(void*)); |
7996a778 MC |
2677 | |
2678 | for (i = 0; i < max; i++) { | |
6320377f | 2679 | q->pool[i] = kzalloc(item_size, GFP_KERNEL); |
7996a778 | 2680 | if (q->pool[i] == NULL) { |
6320377f OK |
2681 | q->max = i; |
2682 | goto enomem; | |
7996a778 | 2683 | } |
7acd72eb | 2684 | kfifo_in(&q->queue, (void*)&q->pool[i], sizeof(void*)); |
7996a778 | 2685 | } |
6320377f OK |
2686 | |
2687 | if (items) { | |
2688 | *items = q->pool + max; | |
2689 | memcpy(*items, q->pool, max * sizeof(void *)); | |
2690 | } | |
2691 | ||
7996a778 | 2692 | return 0; |
6320377f OK |
2693 | |
2694 | enomem: | |
2695 | iscsi_pool_free(q); | |
2696 | return -ENOMEM; | |
7996a778 MC |
2697 | } |
2698 | EXPORT_SYMBOL_GPL(iscsi_pool_init); | |
2699 | ||
6320377f | 2700 | void iscsi_pool_free(struct iscsi_pool *q) |
7996a778 MC |
2701 | { |
2702 | int i; | |
2703 | ||
2704 | for (i = 0; i < q->max; i++) | |
6320377f | 2705 | kfree(q->pool[i]); |
bfcc62ed | 2706 | kvfree(q->pool); |
7996a778 MC |
2707 | } |
2708 | EXPORT_SYMBOL_GPL(iscsi_pool_free); | |
2709 | ||
b4046922 MC |
2710 | int iscsi_host_get_max_scsi_cmds(struct Scsi_Host *shost, |
2711 | uint16_t requested_cmds_max) | |
2712 | { | |
2713 | int scsi_cmds, total_cmds = requested_cmds_max; | |
2714 | ||
2715 | check: | |
2716 | if (!total_cmds) | |
2717 | total_cmds = ISCSI_DEF_XMIT_CMDS_MAX; | |
2718 | /* | |
2719 | * The iscsi layer needs some tasks for nop handling and tmfs, | |
2720 | * so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX | |
2721 | * + 1 command for scsi IO. | |
2722 | */ | |
2723 | if (total_cmds < ISCSI_TOTAL_CMDS_MIN) { | |
2724 | printk(KERN_ERR "iscsi: invalid max cmds of %d. Must be a power of two that is at least %d.\n", | |
2725 | total_cmds, ISCSI_TOTAL_CMDS_MIN); | |
2726 | return -EINVAL; | |
2727 | } | |
2728 | ||
2729 | if (total_cmds > ISCSI_TOTAL_CMDS_MAX) { | |
2730 | printk(KERN_INFO "iscsi: invalid max cmds of %d. Must be a power of 2 less than or equal to %d. Using %d.\n", | |
2731 | requested_cmds_max, ISCSI_TOTAL_CMDS_MAX, | |
2732 | ISCSI_TOTAL_CMDS_MAX); | |
2733 | total_cmds = ISCSI_TOTAL_CMDS_MAX; | |
2734 | } | |
2735 | ||
2736 | if (!is_power_of_2(total_cmds)) { | |
2737 | total_cmds = rounddown_pow_of_two(total_cmds); | |
2738 | if (total_cmds < ISCSI_TOTAL_CMDS_MIN) { | |
2739 | 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); | |
2740 | return -EINVAL; | |
2741 | } | |
2742 | ||
2743 | printk(KERN_INFO "iscsi: invalid max cmds %d. Must be a power of 2. Rounding max cmds down to %d.\n", | |
2744 | requested_cmds_max, total_cmds); | |
2745 | } | |
2746 | ||
2747 | scsi_cmds = total_cmds - ISCSI_MGMT_CMDS_MAX; | |
2748 | if (shost->can_queue && scsi_cmds > shost->can_queue) { | |
2749 | total_cmds = shost->can_queue; | |
2750 | ||
2751 | printk(KERN_INFO "iscsi: requested max cmds %u is higher than driver limit. Using driver limit %u\n", | |
2752 | requested_cmds_max, shost->can_queue); | |
2753 | goto check; | |
2754 | } | |
2755 | ||
2756 | return scsi_cmds; | |
2757 | } | |
2758 | EXPORT_SYMBOL_GPL(iscsi_host_get_max_scsi_cmds); | |
2759 | ||
a4804cd6 MC |
2760 | /** |
2761 | * iscsi_host_add - add host to system | |
2762 | * @shost: scsi host | |
2763 | * @pdev: parent device | |
2764 | * | |
2765 | * This should be called by partial offload and software iscsi drivers | |
2766 | * to add a host to the system. | |
2767 | */ | |
2768 | int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev) | |
2769 | { | |
8e9a20ce MC |
2770 | if (!shost->can_queue) |
2771 | shost->can_queue = ISCSI_DEF_XMIT_CMDS_MAX; | |
2772 | ||
4d108350 MC |
2773 | if (!shost->cmd_per_lun) |
2774 | shost->cmd_per_lun = ISCSI_DEF_CMD_PER_LUN; | |
2775 | ||
a4804cd6 MC |
2776 | return scsi_add_host(shost, pdev); |
2777 | } | |
2778 | EXPORT_SYMBOL_GPL(iscsi_host_add); | |
2779 | ||
2780 | /** | |
2781 | * iscsi_host_alloc - allocate a host and driver data | |
2782 | * @sht: scsi host template | |
2783 | * @dd_data_size: driver host data size | |
32ae763e | 2784 | * @xmit_can_sleep: bool indicating if LLD will queue IO from a work queue |
a4804cd6 MC |
2785 | * |
2786 | * This should be called by partial offload and software iscsi drivers. | |
2787 | * To access the driver specific memory use the iscsi_host_priv() macro. | |
2788 | */ | |
2789 | struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht, | |
4d108350 | 2790 | int dd_data_size, bool xmit_can_sleep) |
75613521 | 2791 | { |
a4804cd6 | 2792 | struct Scsi_Host *shost; |
e5bd7b54 | 2793 | struct iscsi_host *ihost; |
a4804cd6 MC |
2794 | |
2795 | shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size); | |
2796 | if (!shost) | |
2797 | return NULL; | |
e5bd7b54 | 2798 | ihost = shost_priv(shost); |
32ae763e MC |
2799 | |
2800 | if (xmit_can_sleep) { | |
69af1c95 | 2801 | ihost->workq = alloc_workqueue("iscsi_q_%d", |
3ce41966 | 2802 | WQ_SYSFS | __WQ_LEGACY | WQ_MEM_RECLAIM | WQ_UNBOUND, |
69af1c95 | 2803 | 1, shost->host_no); |
32ae763e MC |
2804 | if (!ihost->workq) |
2805 | goto free_host; | |
2806 | } | |
2807 | ||
e5bd7b54 MC |
2808 | spin_lock_init(&ihost->lock); |
2809 | ihost->state = ISCSI_HOST_SETUP; | |
2810 | ihost->num_sessions = 0; | |
2811 | init_waitqueue_head(&ihost->session_removal_wq); | |
a4804cd6 | 2812 | return shost; |
32ae763e MC |
2813 | |
2814 | free_host: | |
2815 | scsi_host_put(shost); | |
2816 | return NULL; | |
a4804cd6 MC |
2817 | } |
2818 | EXPORT_SYMBOL_GPL(iscsi_host_alloc); | |
2819 | ||
e5bd7b54 MC |
2820 | static void iscsi_notify_host_removed(struct iscsi_cls_session *cls_session) |
2821 | { | |
40a06e75 | 2822 | iscsi_session_failure(cls_session->dd_data, ISCSI_ERR_INVALID_HOST); |
e5bd7b54 MC |
2823 | } |
2824 | ||
a4804cd6 MC |
2825 | /** |
2826 | * iscsi_host_remove - remove host and sessions | |
2827 | * @shost: scsi host | |
2828 | * | |
e5bd7b54 MC |
2829 | * If there are any sessions left, this will initiate the removal and wait |
2830 | * for the completion. | |
a4804cd6 MC |
2831 | */ |
2832 | void iscsi_host_remove(struct Scsi_Host *shost) | |
2833 | { | |
e5bd7b54 MC |
2834 | struct iscsi_host *ihost = shost_priv(shost); |
2835 | unsigned long flags; | |
2836 | ||
2837 | spin_lock_irqsave(&ihost->lock, flags); | |
2838 | ihost->state = ISCSI_HOST_REMOVED; | |
2839 | spin_unlock_irqrestore(&ihost->lock, flags); | |
2840 | ||
2841 | iscsi_host_for_each_session(shost, iscsi_notify_host_removed); | |
2842 | wait_event_interruptible(ihost->session_removal_wq, | |
2843 | ihost->num_sessions == 0); | |
2844 | if (signal_pending(current)) | |
2845 | flush_signals(current); | |
2846 | ||
a4804cd6 | 2847 | scsi_remove_host(shost); |
75613521 | 2848 | } |
a4804cd6 | 2849 | EXPORT_SYMBOL_GPL(iscsi_host_remove); |
7996a778 | 2850 | |
a4804cd6 | 2851 | void iscsi_host_free(struct Scsi_Host *shost) |
75613521 MC |
2852 | { |
2853 | struct iscsi_host *ihost = shost_priv(shost); | |
7996a778 | 2854 | |
c435f0a9 MC |
2855 | if (ihost->workq) |
2856 | destroy_workqueue(ihost->workq); | |
2857 | ||
75613521 MC |
2858 | kfree(ihost->netdev); |
2859 | kfree(ihost->hwaddress); | |
2860 | kfree(ihost->initiatorname); | |
a4804cd6 | 2861 | scsi_host_put(shost); |
75613521 | 2862 | } |
a4804cd6 | 2863 | EXPORT_SYMBOL_GPL(iscsi_host_free); |
7996a778 | 2864 | |
e5bd7b54 MC |
2865 | static void iscsi_host_dec_session_cnt(struct Scsi_Host *shost) |
2866 | { | |
2867 | struct iscsi_host *ihost = shost_priv(shost); | |
2868 | unsigned long flags; | |
2869 | ||
2870 | shost = scsi_host_get(shost); | |
2871 | if (!shost) { | |
2872 | printk(KERN_ERR "Invalid state. Cannot notify host removal " | |
2873 | "of session teardown event because host already " | |
2874 | "removed.\n"); | |
2875 | return; | |
2876 | } | |
2877 | ||
2878 | spin_lock_irqsave(&ihost->lock, flags); | |
2879 | ihost->num_sessions--; | |
2880 | if (ihost->num_sessions == 0) | |
2881 | wake_up(&ihost->session_removal_wq); | |
2882 | spin_unlock_irqrestore(&ihost->lock, flags); | |
2883 | scsi_host_put(shost); | |
2884 | } | |
2885 | ||
7996a778 MC |
2886 | /** |
2887 | * iscsi_session_setup - create iscsi cls session and host and session | |
7996a778 | 2888 | * @iscsit: iscsi transport template |
75613521 MC |
2889 | * @shost: scsi host |
2890 | * @cmds_max: session can queue | |
ccd4a430 | 2891 | * @dd_size: private driver data size, added to session allocation size |
9c19a7d0 | 2892 | * @cmd_task_size: LLD task private data size |
7996a778 | 2893 | * @initial_cmdsn: initial CmdSN |
ccd4a430 | 2894 | * @id: target ID to add to this session |
7996a778 MC |
2895 | * |
2896 | * This can be used by software iscsi_transports that allocate | |
2897 | * a session per scsi host. | |
3cf7b233 MC |
2898 | * |
2899 | * Callers should set cmds_max to the largest total numer (mgmt + scsi) of | |
2900 | * tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks | |
2901 | * for nop handling and login/logout requests. | |
75613521 | 2902 | */ |
7996a778 | 2903 | struct iscsi_cls_session * |
75613521 | 2904 | iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost, |
b8b9e1b8 | 2905 | uint16_t cmds_max, int dd_size, int cmd_task_size, |
7970634b | 2906 | uint32_t initial_cmdsn, unsigned int id) |
7996a778 | 2907 | { |
e5bd7b54 | 2908 | struct iscsi_host *ihost = shost_priv(shost); |
7996a778 MC |
2909 | struct iscsi_session *session; |
2910 | struct iscsi_cls_session *cls_session; | |
b4046922 | 2911 | int cmd_i, scsi_cmds; |
e5bd7b54 MC |
2912 | unsigned long flags; |
2913 | ||
2914 | spin_lock_irqsave(&ihost->lock, flags); | |
2915 | if (ihost->state == ISCSI_HOST_REMOVED) { | |
2916 | spin_unlock_irqrestore(&ihost->lock, flags); | |
2917 | return NULL; | |
2918 | } | |
2919 | ihost->num_sessions++; | |
2920 | spin_unlock_irqrestore(&ihost->lock, flags); | |
8e9a20ce | 2921 | |
b4046922 MC |
2922 | scsi_cmds = iscsi_host_get_max_scsi_cmds(shost, cmds_max); |
2923 | if (scsi_cmds < 0) | |
e5bd7b54 | 2924 | goto dec_session_count; |
1548271e | 2925 | |
5d91e209 | 2926 | cls_session = iscsi_alloc_session(shost, iscsit, |
b8b9e1b8 JK |
2927 | sizeof(struct iscsi_session) + |
2928 | dd_size); | |
75613521 | 2929 | if (!cls_session) |
e5bd7b54 | 2930 | goto dec_session_count; |
75613521 MC |
2931 | session = cls_session->dd_data; |
2932 | session->cls_session = cls_session; | |
7996a778 MC |
2933 | session->host = shost; |
2934 | session->state = ISCSI_STATE_FREE; | |
f6d5180c | 2935 | session->fast_abort = 1; |
3fe5ae8b | 2936 | session->tgt_reset_timeout = 30; |
4cd49ea1 MC |
2937 | session->lu_reset_timeout = 15; |
2938 | session->abort_timeout = 10; | |
3cf7b233 | 2939 | session->scsi_cmds_max = scsi_cmds; |
b4046922 | 2940 | session->cmds_max = scsi_cmds + ISCSI_MGMT_CMDS_MAX; |
e0726407 | 2941 | session->queued_cmdsn = session->cmdsn = initial_cmdsn; |
7996a778 MC |
2942 | session->exp_cmdsn = initial_cmdsn + 1; |
2943 | session->max_cmdsn = initial_cmdsn + 1; | |
2944 | session->max_r2t = 1; | |
2945 | session->tt = iscsit; | |
b8b9e1b8 | 2946 | session->dd_data = cls_session->dd_data + sizeof(*session); |
659743b0 | 2947 | |
ec29d0ac MC |
2948 | session->tmf_state = TMF_INITIAL; |
2949 | timer_setup(&session->tmf_timer, iscsi_tmf_timedout, 0); | |
6724add1 | 2950 | mutex_init(&session->eh_mutex); |
e018f03d | 2951 | init_waitqueue_head(&session->ehwait); |
ec29d0ac | 2952 | |
659743b0 SP |
2953 | spin_lock_init(&session->frwd_lock); |
2954 | spin_lock_init(&session->back_lock); | |
7996a778 MC |
2955 | |
2956 | /* initialize SCSI PDU commands pool */ | |
2957 | if (iscsi_pool_init(&session->cmdpool, session->cmds_max, | |
2958 | (void***)&session->cmds, | |
9c19a7d0 | 2959 | cmd_task_size + sizeof(struct iscsi_task))) |
7996a778 MC |
2960 | goto cmdpool_alloc_fail; |
2961 | ||
2962 | /* pre-format cmds pool with ITT */ | |
2963 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
9c19a7d0 | 2964 | struct iscsi_task *task = session->cmds[cmd_i]; |
7996a778 | 2965 | |
9c19a7d0 MC |
2966 | if (cmd_task_size) |
2967 | task->dd_data = &task[1]; | |
2968 | task->itt = cmd_i; | |
3bbaaad9 | 2969 | task->state = ISCSI_TASK_FREE; |
9c19a7d0 | 2970 | INIT_LIST_HEAD(&task->running); |
7996a778 MC |
2971 | } |
2972 | ||
f53a88da | 2973 | if (!try_module_get(iscsit->owner)) |
75613521 | 2974 | goto module_get_fail; |
7996a778 | 2975 | |
7970634b | 2976 | if (iscsi_add_session(cls_session, id)) |
75613521 | 2977 | goto cls_session_fail; |
e5bd7b54 | 2978 | |
7996a778 MC |
2979 | return cls_session; |
2980 | ||
2981 | cls_session_fail: | |
75613521 MC |
2982 | module_put(iscsit->owner); |
2983 | module_get_fail: | |
6320377f | 2984 | iscsi_pool_free(&session->cmdpool); |
7996a778 | 2985 | cmdpool_alloc_fail: |
75613521 | 2986 | iscsi_free_session(cls_session); |
e5bd7b54 MC |
2987 | dec_session_count: |
2988 | iscsi_host_dec_session_cnt(shost); | |
7996a778 MC |
2989 | return NULL; |
2990 | } | |
2991 | EXPORT_SYMBOL_GPL(iscsi_session_setup); | |
2992 | ||
2993 | /** | |
2994 | * iscsi_session_teardown - destroy session, host, and cls_session | |
75613521 | 2995 | * @cls_session: iscsi session |
75613521 | 2996 | */ |
7996a778 MC |
2997 | void iscsi_session_teardown(struct iscsi_cls_session *cls_session) |
2998 | { | |
75613521 | 2999 | struct iscsi_session *session = cls_session->dd_data; |
63f75cc8 | 3000 | struct module *owner = cls_session->transport->owner; |
e5bd7b54 | 3001 | struct Scsi_Host *shost = session->host; |
7996a778 | 3002 | |
9e10b512 KK |
3003 | iscsi_remove_session(cls_session); |
3004 | ||
a1f3486b | 3005 | iscsi_pool_free(&session->cmdpool); |
b2c64167 MC |
3006 | kfree(session->password); |
3007 | kfree(session->password_in); | |
3008 | kfree(session->username); | |
3009 | kfree(session->username_in); | |
f3ff0c36 | 3010 | kfree(session->targetname); |
3c5c4801 | 3011 | kfree(session->targetalias); |
88dfd340 | 3012 | kfree(session->initiatorname); |
3b9373e9 EW |
3013 | kfree(session->boot_root); |
3014 | kfree(session->boot_nic); | |
3015 | kfree(session->boot_target); | |
88dfd340 | 3016 | kfree(session->ifacename); |
f8525eb4 AC |
3017 | kfree(session->portal_type); |
3018 | kfree(session->discovery_parent_type); | |
f3ff0c36 | 3019 | |
9e10b512 KK |
3020 | iscsi_free_session(cls_session); |
3021 | ||
e5bd7b54 | 3022 | iscsi_host_dec_session_cnt(shost); |
63f75cc8 | 3023 | module_put(owner); |
7996a778 MC |
3024 | } |
3025 | EXPORT_SYMBOL_GPL(iscsi_session_teardown); | |
3026 | ||
3027 | /** | |
3028 | * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn | |
3029 | * @cls_session: iscsi_cls_session | |
5d91e209 | 3030 | * @dd_size: private driver data size |
7996a778 | 3031 | * @conn_idx: cid |
5d91e209 | 3032 | */ |
7996a778 | 3033 | struct iscsi_cls_conn * |
5d91e209 MC |
3034 | iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size, |
3035 | uint32_t conn_idx) | |
7996a778 | 3036 | { |
75613521 | 3037 | struct iscsi_session *session = cls_session->dd_data; |
7996a778 MC |
3038 | struct iscsi_conn *conn; |
3039 | struct iscsi_cls_conn *cls_conn; | |
d36ab6f3 | 3040 | char *data; |
7dae459f | 3041 | int err; |
7996a778 | 3042 | |
7dae459f | 3043 | cls_conn = iscsi_alloc_conn(cls_session, sizeof(*conn) + dd_size, |
5d91e209 | 3044 | conn_idx); |
7996a778 MC |
3045 | if (!cls_conn) |
3046 | return NULL; | |
3047 | conn = cls_conn->dd_data; | |
5d91e209 | 3048 | memset(conn, 0, sizeof(*conn) + dd_size); |
7996a778 | 3049 | |
5d91e209 | 3050 | conn->dd_data = cls_conn->dd_data + sizeof(*conn); |
7996a778 MC |
3051 | conn->session = session; |
3052 | conn->cls_conn = cls_conn; | |
3053 | conn->c_stage = ISCSI_CONN_INITIAL_STAGE; | |
3054 | conn->id = conn_idx; | |
3055 | conn->exp_statsn = 0; | |
f6d5180c | 3056 | |
2c4b9637 | 3057 | timer_setup(&conn->transport_timer, iscsi_check_transport_timeouts, 0); |
f6d5180c | 3058 | |
843c0a8a | 3059 | INIT_LIST_HEAD(&conn->mgmtqueue); |
3bbaaad9 | 3060 | INIT_LIST_HEAD(&conn->cmdqueue); |
843c0a8a | 3061 | INIT_LIST_HEAD(&conn->requeue); |
c4028958 | 3062 | INIT_WORK(&conn->xmitwork, iscsi_xmitworker); |
7996a778 | 3063 | |
9c19a7d0 | 3064 | /* allocate login_task used for the login/text sequences */ |
659743b0 | 3065 | spin_lock_bh(&session->frwd_lock); |
7acd72eb | 3066 | if (!kfifo_out(&session->cmdpool.queue, |
9c19a7d0 | 3067 | (void*)&conn->login_task, |
7996a778 | 3068 | sizeof(void*))) { |
659743b0 | 3069 | spin_unlock_bh(&session->frwd_lock); |
9c19a7d0 | 3070 | goto login_task_alloc_fail; |
7996a778 | 3071 | } |
659743b0 | 3072 | spin_unlock_bh(&session->frwd_lock); |
7996a778 | 3073 | |
cfeb2cf9 MC |
3074 | data = (char *) __get_free_pages(GFP_KERNEL, |
3075 | get_order(ISCSI_DEF_MAX_RECV_SEG_LEN)); | |
d36ab6f3 | 3076 | if (!data) |
9c19a7d0 MC |
3077 | goto login_task_data_alloc_fail; |
3078 | conn->login_task->data = conn->data = data; | |
d36ab6f3 | 3079 | |
7dae459f WH |
3080 | err = iscsi_add_conn(cls_conn); |
3081 | if (err) | |
3082 | goto login_task_add_dev_fail; | |
3083 | ||
7996a778 MC |
3084 | return cls_conn; |
3085 | ||
7dae459f WH |
3086 | login_task_add_dev_fail: |
3087 | free_pages((unsigned long) conn->data, | |
3088 | get_order(ISCSI_DEF_MAX_RECV_SEG_LEN)); | |
3089 | ||
9c19a7d0 | 3090 | login_task_data_alloc_fail: |
7acd72eb | 3091 | kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task, |
d36ab6f3 | 3092 | sizeof(void*)); |
9c19a7d0 | 3093 | login_task_alloc_fail: |
7dae459f | 3094 | iscsi_put_conn(cls_conn); |
7996a778 MC |
3095 | return NULL; |
3096 | } | |
3097 | EXPORT_SYMBOL_GPL(iscsi_conn_setup); | |
3098 | ||
3099 | /** | |
3100 | * iscsi_conn_teardown - teardown iscsi connection | |
ccd4a430 | 3101 | * @cls_conn: iscsi class connection |
7996a778 MC |
3102 | * |
3103 | * TODO: we may need to make this into a two step process | |
3104 | * like scsi-mls remove + put host | |
3105 | */ | |
3106 | void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn) | |
3107 | { | |
3108 | struct iscsi_conn *conn = cls_conn->dd_data; | |
3109 | struct iscsi_session *session = conn->session; | |
8709c323 WH |
3110 | |
3111 | iscsi_remove_conn(cls_conn); | |
7996a778 | 3112 | |
f6d5180c MC |
3113 | del_timer_sync(&conn->transport_timer); |
3114 | ||
660d0831 | 3115 | mutex_lock(&session->eh_mutex); |
659743b0 | 3116 | spin_lock_bh(&session->frwd_lock); |
7996a778 MC |
3117 | conn->c_stage = ISCSI_CONN_CLEANUP_WAIT; |
3118 | if (session->leadconn == conn) { | |
3119 | /* | |
3120 | * leading connection? then give up on recovery. | |
3121 | */ | |
3122 | session->state = ISCSI_STATE_TERMINATE; | |
ec29d0ac | 3123 | wake_up(&session->ehwait); |
7996a778 | 3124 | } |
659743b0 | 3125 | spin_unlock_bh(&session->frwd_lock); |
7996a778 | 3126 | |
779ea120 | 3127 | /* flush queued up work because we free the connection below */ |
843c0a8a | 3128 | iscsi_suspend_tx(conn); |
779ea120 | 3129 | |
659743b0 | 3130 | spin_lock_bh(&session->frwd_lock); |
cfeb2cf9 MC |
3131 | free_pages((unsigned long) conn->data, |
3132 | get_order(ISCSI_DEF_MAX_RECV_SEG_LEN)); | |
8709c323 WH |
3133 | kfree(conn->persistent_address); |
3134 | kfree(conn->local_ipaddr); | |
659743b0 SP |
3135 | /* regular RX path uses back_lock */ |
3136 | spin_lock_bh(&session->back_lock); | |
7acd72eb | 3137 | kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task, |
7996a778 | 3138 | sizeof(void*)); |
659743b0 | 3139 | spin_unlock_bh(&session->back_lock); |
e0726407 | 3140 | if (session->leadconn == conn) |
7996a778 | 3141 | session->leadconn = NULL; |
659743b0 | 3142 | spin_unlock_bh(&session->frwd_lock); |
660d0831 | 3143 | mutex_unlock(&session->eh_mutex); |
7996a778 | 3144 | |
8709c323 | 3145 | iscsi_put_conn(cls_conn); |
7996a778 MC |
3146 | } |
3147 | EXPORT_SYMBOL_GPL(iscsi_conn_teardown); | |
3148 | ||
3149 | int iscsi_conn_start(struct iscsi_cls_conn *cls_conn) | |
3150 | { | |
3151 | struct iscsi_conn *conn = cls_conn->dd_data; | |
3152 | struct iscsi_session *session = conn->session; | |
3153 | ||
ffd0436e | 3154 | if (!session) { |
322d739d MC |
3155 | iscsi_conn_printk(KERN_ERR, conn, |
3156 | "can't start unbound connection\n"); | |
7996a778 MC |
3157 | return -EPERM; |
3158 | } | |
3159 | ||
db98ccde MC |
3160 | if ((session->imm_data_en || !session->initial_r2t_en) && |
3161 | session->first_burst > session->max_burst) { | |
322d739d MC |
3162 | iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: " |
3163 | "first_burst %d max_burst %d\n", | |
3164 | session->first_burst, session->max_burst); | |
ffd0436e MC |
3165 | return -EINVAL; |
3166 | } | |
3167 | ||
f6d5180c | 3168 | if (conn->ping_timeout && !conn->recv_timeout) { |
322d739d MC |
3169 | iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of " |
3170 | "zero. Using 5 seconds\n."); | |
f6d5180c MC |
3171 | conn->recv_timeout = 5; |
3172 | } | |
3173 | ||
3174 | if (conn->recv_timeout && !conn->ping_timeout) { | |
322d739d MC |
3175 | iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of " |
3176 | "zero. Using 5 seconds.\n"); | |
f6d5180c MC |
3177 | conn->ping_timeout = 5; |
3178 | } | |
3179 | ||
659743b0 | 3180 | spin_lock_bh(&session->frwd_lock); |
7996a778 MC |
3181 | conn->c_stage = ISCSI_CONN_STARTED; |
3182 | session->state = ISCSI_STATE_LOGGED_IN; | |
e0726407 | 3183 | session->queued_cmdsn = session->cmdsn; |
7996a778 | 3184 | |
f6d5180c MC |
3185 | conn->last_recv = jiffies; |
3186 | conn->last_ping = jiffies; | |
3187 | if (conn->recv_timeout && conn->ping_timeout) | |
3188 | mod_timer(&conn->transport_timer, | |
3189 | jiffies + (conn->recv_timeout * HZ)); | |
3190 | ||
7996a778 MC |
3191 | switch(conn->stop_stage) { |
3192 | case STOP_CONN_RECOVER: | |
3193 | /* | |
3194 | * unblock eh_abort() if it is blocked. re-try all | |
3195 | * commands after successful recovery | |
3196 | */ | |
7996a778 | 3197 | conn->stop_stage = 0; |
ec29d0ac | 3198 | session->tmf_state = TMF_INITIAL; |
7996a778 | 3199 | session->age++; |
8b1d0343 MC |
3200 | if (session->age == 16) |
3201 | session->age = 0; | |
6eabafbe | 3202 | break; |
7996a778 | 3203 | case STOP_CONN_TERM: |
7996a778 | 3204 | conn->stop_stage = 0; |
7996a778 MC |
3205 | break; |
3206 | default: | |
3207 | break; | |
3208 | } | |
659743b0 | 3209 | spin_unlock_bh(&session->frwd_lock); |
7996a778 | 3210 | |
75613521 | 3211 | iscsi_unblock_session(session->cls_session); |
ec29d0ac | 3212 | wake_up(&session->ehwait); |
7996a778 MC |
3213 | return 0; |
3214 | } | |
3215 | EXPORT_SYMBOL_GPL(iscsi_conn_start); | |
3216 | ||
3217 | static void | |
3bbaaad9 | 3218 | fail_mgmt_tasks(struct iscsi_session *session, struct iscsi_conn *conn) |
7996a778 | 3219 | { |
3bbaaad9 | 3220 | struct iscsi_task *task; |
b3cd5050 | 3221 | int i, state; |
7996a778 | 3222 | |
3bbaaad9 MC |
3223 | for (i = 0; i < conn->session->cmds_max; i++) { |
3224 | task = conn->session->cmds[i]; | |
3225 | if (task->sc) | |
3226 | continue; | |
7996a778 | 3227 | |
3bbaaad9 MC |
3228 | if (task->state == ISCSI_TASK_FREE) |
3229 | continue; | |
7996a778 | 3230 | |
3bbaaad9 MC |
3231 | ISCSI_DBG_SESSION(conn->session, |
3232 | "failing mgmt itt 0x%x state %d\n", | |
3233 | task->itt, task->state); | |
5923d64b MC |
3234 | |
3235 | spin_lock_bh(&session->back_lock); | |
3236 | if (cleanup_queued_task(task)) { | |
3237 | spin_unlock_bh(&session->back_lock); | |
3238 | continue; | |
3239 | } | |
3240 | ||
b3cd5050 MC |
3241 | state = ISCSI_TASK_ABRT_SESS_RECOV; |
3242 | if (task->state == ISCSI_TASK_PENDING) | |
3243 | state = ISCSI_TASK_COMPLETED; | |
3244 | iscsi_complete_task(task, state); | |
a656183e | 3245 | spin_unlock_bh(&session->back_lock); |
3bbaaad9 | 3246 | } |
7996a778 MC |
3247 | } |
3248 | ||
0dcf8feb | 3249 | void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) |
7996a778 | 3250 | { |
0dcf8feb MC |
3251 | struct iscsi_conn *conn = cls_conn->dd_data; |
3252 | struct iscsi_session *session = conn->session; | |
ed2abc7f MC |
3253 | int old_stop_stage; |
3254 | ||
6724add1 | 3255 | mutex_lock(&session->eh_mutex); |
659743b0 | 3256 | spin_lock_bh(&session->frwd_lock); |
ed2abc7f | 3257 | if (conn->stop_stage == STOP_CONN_TERM) { |
659743b0 | 3258 | spin_unlock_bh(&session->frwd_lock); |
6724add1 MC |
3259 | mutex_unlock(&session->eh_mutex); |
3260 | return; | |
3261 | } | |
3262 | ||
ed2abc7f MC |
3263 | /* |
3264 | * When this is called for the in_login state, we only want to clean | |
9c19a7d0 | 3265 | * up the login task and connection. We do not need to block and set |
67a61114 | 3266 | * the recovery state again |
ed2abc7f | 3267 | */ |
67a61114 MC |
3268 | if (flag == STOP_CONN_TERM) |
3269 | session->state = ISCSI_STATE_TERMINATE; | |
3270 | else if (conn->stop_stage != STOP_CONN_RECOVER) | |
3271 | session->state = ISCSI_STATE_IN_RECOVERY; | |
4ae0a6c1 MC |
3272 | |
3273 | old_stop_stage = conn->stop_stage; | |
3274 | conn->stop_stage = flag; | |
659743b0 | 3275 | spin_unlock_bh(&session->frwd_lock); |
ed2abc7f | 3276 | |
26013ad4 MC |
3277 | del_timer_sync(&conn->transport_timer); |
3278 | iscsi_suspend_tx(conn); | |
3279 | ||
659743b0 | 3280 | spin_lock_bh(&session->frwd_lock); |
67a61114 | 3281 | conn->c_stage = ISCSI_CONN_STOPPED; |
659743b0 | 3282 | spin_unlock_bh(&session->frwd_lock); |
6724add1 | 3283 | |
7996a778 MC |
3284 | /* |
3285 | * for connection level recovery we should not calculate | |
3286 | * header digest. conn->hdr_size used for optimization | |
3287 | * in hdr_extract() and will be re-negotiated at | |
3288 | * set_param() time. | |
3289 | */ | |
3290 | if (flag == STOP_CONN_RECOVER) { | |
3291 | conn->hdrdgst_en = 0; | |
3292 | conn->datadgst_en = 0; | |
656cffc9 | 3293 | if (session->state == ISCSI_STATE_IN_RECOVERY && |
67a61114 | 3294 | old_stop_stage != STOP_CONN_RECOVER) { |
1b2c7af8 | 3295 | ISCSI_DBG_SESSION(session, "blocking session\n"); |
75613521 | 3296 | iscsi_block_session(session->cls_session); |
67a61114 | 3297 | } |
7996a778 | 3298 | } |
656cffc9 | 3299 | |
656cffc9 MC |
3300 | /* |
3301 | * flush queues. | |
3302 | */ | |
659743b0 | 3303 | spin_lock_bh(&session->frwd_lock); |
b3cd5050 | 3304 | fail_scsi_tasks(conn, -1, DID_TRANSPORT_DISRUPTED); |
3bbaaad9 | 3305 | fail_mgmt_tasks(session, conn); |
ec29d0ac | 3306 | memset(&session->tmhdr, 0, sizeof(session->tmhdr)); |
659743b0 | 3307 | spin_unlock_bh(&session->frwd_lock); |
6724add1 | 3308 | mutex_unlock(&session->eh_mutex); |
7996a778 | 3309 | } |
7996a778 MC |
3310 | EXPORT_SYMBOL_GPL(iscsi_conn_stop); |
3311 | ||
3312 | int iscsi_conn_bind(struct iscsi_cls_session *cls_session, | |
3313 | struct iscsi_cls_conn *cls_conn, int is_leading) | |
3314 | { | |
75613521 | 3315 | struct iscsi_session *session = cls_session->dd_data; |
98644047 | 3316 | struct iscsi_conn *conn = cls_conn->dd_data; |
7996a778 | 3317 | |
659743b0 | 3318 | spin_lock_bh(&session->frwd_lock); |
7996a778 MC |
3319 | if (is_leading) |
3320 | session->leadconn = conn; | |
659743b0 | 3321 | spin_unlock_bh(&session->frwd_lock); |
7996a778 | 3322 | |
c8447e4c MC |
3323 | /* |
3324 | * The target could have reduced it's window size between logins, so | |
3325 | * we have to reset max/exp cmdsn so we can see the new values. | |
3326 | */ | |
3327 | spin_lock_bh(&session->back_lock); | |
3328 | session->max_cmdsn = session->exp_cmdsn = session->cmdsn + 1; | |
3329 | spin_unlock_bh(&session->back_lock); | |
7996a778 MC |
3330 | /* |
3331 | * Unblock xmitworker(), Login Phase will pass through. | |
3332 | */ | |
3333 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
3334 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
3335 | return 0; | |
3336 | } | |
3337 | EXPORT_SYMBOL_GPL(iscsi_conn_bind); | |
3338 | ||
adaf6990 | 3339 | int iscsi_switch_str_param(char **param, char *new_val_buf) |
5700b1af MC |
3340 | { |
3341 | char *new_val; | |
3342 | ||
3343 | if (*param) { | |
3344 | if (!strcmp(*param, new_val_buf)) | |
3345 | return 0; | |
3346 | } | |
3347 | ||
3348 | new_val = kstrdup(new_val_buf, GFP_NOIO); | |
3349 | if (!new_val) | |
3350 | return -ENOMEM; | |
3351 | ||
3352 | kfree(*param); | |
3353 | *param = new_val; | |
3354 | return 0; | |
3355 | } | |
adaf6990 | 3356 | EXPORT_SYMBOL_GPL(iscsi_switch_str_param); |
a54a52ca MC |
3357 | |
3358 | int iscsi_set_param(struct iscsi_cls_conn *cls_conn, | |
3359 | enum iscsi_param param, char *buf, int buflen) | |
3360 | { | |
3361 | struct iscsi_conn *conn = cls_conn->dd_data; | |
3362 | struct iscsi_session *session = conn->session; | |
6a06a4b8 | 3363 | int val; |
a54a52ca MC |
3364 | |
3365 | switch(param) { | |
843c0a8a MC |
3366 | case ISCSI_PARAM_FAST_ABORT: |
3367 | sscanf(buf, "%d", &session->fast_abort); | |
3368 | break; | |
f6d5180c MC |
3369 | case ISCSI_PARAM_ABORT_TMO: |
3370 | sscanf(buf, "%d", &session->abort_timeout); | |
3371 | break; | |
3372 | case ISCSI_PARAM_LU_RESET_TMO: | |
3373 | sscanf(buf, "%d", &session->lu_reset_timeout); | |
3374 | break; | |
3fe5ae8b MC |
3375 | case ISCSI_PARAM_TGT_RESET_TMO: |
3376 | sscanf(buf, "%d", &session->tgt_reset_timeout); | |
3377 | break; | |
f6d5180c MC |
3378 | case ISCSI_PARAM_PING_TMO: |
3379 | sscanf(buf, "%d", &conn->ping_timeout); | |
3380 | break; | |
3381 | case ISCSI_PARAM_RECV_TMO: | |
3382 | sscanf(buf, "%d", &conn->recv_timeout); | |
3383 | break; | |
a54a52ca MC |
3384 | case ISCSI_PARAM_MAX_RECV_DLENGTH: |
3385 | sscanf(buf, "%d", &conn->max_recv_dlength); | |
3386 | break; | |
3387 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
3388 | sscanf(buf, "%d", &conn->max_xmit_dlength); | |
3389 | break; | |
3390 | case ISCSI_PARAM_HDRDGST_EN: | |
3391 | sscanf(buf, "%d", &conn->hdrdgst_en); | |
3392 | break; | |
3393 | case ISCSI_PARAM_DATADGST_EN: | |
3394 | sscanf(buf, "%d", &conn->datadgst_en); | |
3395 | break; | |
3396 | case ISCSI_PARAM_INITIAL_R2T_EN: | |
3397 | sscanf(buf, "%d", &session->initial_r2t_en); | |
3398 | break; | |
3399 | case ISCSI_PARAM_MAX_R2T: | |
1304be5f | 3400 | sscanf(buf, "%hu", &session->max_r2t); |
a54a52ca MC |
3401 | break; |
3402 | case ISCSI_PARAM_IMM_DATA_EN: | |
3403 | sscanf(buf, "%d", &session->imm_data_en); | |
3404 | break; | |
3405 | case ISCSI_PARAM_FIRST_BURST: | |
3406 | sscanf(buf, "%d", &session->first_burst); | |
3407 | break; | |
3408 | case ISCSI_PARAM_MAX_BURST: | |
3409 | sscanf(buf, "%d", &session->max_burst); | |
3410 | break; | |
3411 | case ISCSI_PARAM_PDU_INORDER_EN: | |
3412 | sscanf(buf, "%d", &session->pdu_inorder_en); | |
3413 | break; | |
3414 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
3415 | sscanf(buf, "%d", &session->dataseq_inorder_en); | |
3416 | break; | |
3417 | case ISCSI_PARAM_ERL: | |
3418 | sscanf(buf, "%d", &session->erl); | |
3419 | break; | |
a54a52ca MC |
3420 | case ISCSI_PARAM_EXP_STATSN: |
3421 | sscanf(buf, "%u", &conn->exp_statsn); | |
3422 | break; | |
b2c64167 | 3423 | case ISCSI_PARAM_USERNAME: |
5700b1af | 3424 | return iscsi_switch_str_param(&session->username, buf); |
b2c64167 | 3425 | case ISCSI_PARAM_USERNAME_IN: |
5700b1af | 3426 | return iscsi_switch_str_param(&session->username_in, buf); |
b2c64167 | 3427 | case ISCSI_PARAM_PASSWORD: |
5700b1af | 3428 | return iscsi_switch_str_param(&session->password, buf); |
b2c64167 | 3429 | case ISCSI_PARAM_PASSWORD_IN: |
5700b1af | 3430 | return iscsi_switch_str_param(&session->password_in, buf); |
a54a52ca | 3431 | case ISCSI_PARAM_TARGET_NAME: |
5700b1af | 3432 | return iscsi_switch_str_param(&session->targetname, buf); |
3c5c4801 VC |
3433 | case ISCSI_PARAM_TARGET_ALIAS: |
3434 | return iscsi_switch_str_param(&session->targetalias, buf); | |
a54a52ca MC |
3435 | case ISCSI_PARAM_TPGT: |
3436 | sscanf(buf, "%d", &session->tpgt); | |
3437 | break; | |
3438 | case ISCSI_PARAM_PERSISTENT_PORT: | |
3439 | sscanf(buf, "%d", &conn->persistent_port); | |
3440 | break; | |
3441 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
5700b1af | 3442 | return iscsi_switch_str_param(&conn->persistent_address, buf); |
88dfd340 | 3443 | case ISCSI_PARAM_IFACE_NAME: |
5700b1af | 3444 | return iscsi_switch_str_param(&session->ifacename, buf); |
88dfd340 | 3445 | case ISCSI_PARAM_INITIATOR_NAME: |
5700b1af | 3446 | return iscsi_switch_str_param(&session->initiatorname, buf); |
3b9373e9 EW |
3447 | case ISCSI_PARAM_BOOT_ROOT: |
3448 | return iscsi_switch_str_param(&session->boot_root, buf); | |
3449 | case ISCSI_PARAM_BOOT_NIC: | |
3450 | return iscsi_switch_str_param(&session->boot_nic, buf); | |
3451 | case ISCSI_PARAM_BOOT_TARGET: | |
3452 | return iscsi_switch_str_param(&session->boot_target, buf); | |
f8525eb4 AC |
3453 | case ISCSI_PARAM_PORTAL_TYPE: |
3454 | return iscsi_switch_str_param(&session->portal_type, buf); | |
3455 | case ISCSI_PARAM_DISCOVERY_PARENT_TYPE: | |
3456 | return iscsi_switch_str_param(&session->discovery_parent_type, | |
3457 | buf); | |
6a06a4b8 OG |
3458 | case ISCSI_PARAM_DISCOVERY_SESS: |
3459 | sscanf(buf, "%d", &val); | |
3460 | session->discovery_sess = !!val; | |
3461 | break; | |
ae56ff40 AC |
3462 | case ISCSI_PARAM_LOCAL_IPADDR: |
3463 | return iscsi_switch_str_param(&conn->local_ipaddr, buf); | |
a54a52ca MC |
3464 | default: |
3465 | return -ENOSYS; | |
3466 | } | |
3467 | ||
3468 | return 0; | |
3469 | } | |
3470 | EXPORT_SYMBOL_GPL(iscsi_set_param); | |
3471 | ||
3472 | int iscsi_session_get_param(struct iscsi_cls_session *cls_session, | |
3473 | enum iscsi_param param, char *buf) | |
3474 | { | |
75613521 | 3475 | struct iscsi_session *session = cls_session->dd_data; |
a54a52ca MC |
3476 | int len; |
3477 | ||
3478 | switch(param) { | |
843c0a8a | 3479 | case ISCSI_PARAM_FAST_ABORT: |
ec98ea70 | 3480 | len = sysfs_emit(buf, "%d\n", session->fast_abort); |
843c0a8a | 3481 | break; |
f6d5180c | 3482 | case ISCSI_PARAM_ABORT_TMO: |
ec98ea70 | 3483 | len = sysfs_emit(buf, "%d\n", session->abort_timeout); |
f6d5180c MC |
3484 | break; |
3485 | case ISCSI_PARAM_LU_RESET_TMO: | |
ec98ea70 | 3486 | len = sysfs_emit(buf, "%d\n", session->lu_reset_timeout); |
f6d5180c | 3487 | break; |
3fe5ae8b | 3488 | case ISCSI_PARAM_TGT_RESET_TMO: |
ec98ea70 | 3489 | len = sysfs_emit(buf, "%d\n", session->tgt_reset_timeout); |
3fe5ae8b | 3490 | break; |
a54a52ca | 3491 | case ISCSI_PARAM_INITIAL_R2T_EN: |
ec98ea70 | 3492 | len = sysfs_emit(buf, "%d\n", session->initial_r2t_en); |
a54a52ca MC |
3493 | break; |
3494 | case ISCSI_PARAM_MAX_R2T: | |
ec98ea70 | 3495 | len = sysfs_emit(buf, "%hu\n", session->max_r2t); |
a54a52ca MC |
3496 | break; |
3497 | case ISCSI_PARAM_IMM_DATA_EN: | |
ec98ea70 | 3498 | len = sysfs_emit(buf, "%d\n", session->imm_data_en); |
a54a52ca MC |
3499 | break; |
3500 | case ISCSI_PARAM_FIRST_BURST: | |
ec98ea70 | 3501 | len = sysfs_emit(buf, "%u\n", session->first_burst); |
a54a52ca MC |
3502 | break; |
3503 | case ISCSI_PARAM_MAX_BURST: | |
ec98ea70 | 3504 | len = sysfs_emit(buf, "%u\n", session->max_burst); |
a54a52ca MC |
3505 | break; |
3506 | case ISCSI_PARAM_PDU_INORDER_EN: | |
ec98ea70 | 3507 | len = sysfs_emit(buf, "%d\n", session->pdu_inorder_en); |
a54a52ca MC |
3508 | break; |
3509 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
ec98ea70 | 3510 | len = sysfs_emit(buf, "%d\n", session->dataseq_inorder_en); |
a54a52ca | 3511 | break; |
5f09e1f3 | 3512 | case ISCSI_PARAM_DEF_TASKMGMT_TMO: |
ec98ea70 | 3513 | len = sysfs_emit(buf, "%d\n", session->def_taskmgmt_tmo); |
5f09e1f3 | 3514 | break; |
a54a52ca | 3515 | case ISCSI_PARAM_ERL: |
ec98ea70 | 3516 | len = sysfs_emit(buf, "%d\n", session->erl); |
a54a52ca MC |
3517 | break; |
3518 | case ISCSI_PARAM_TARGET_NAME: | |
ec98ea70 | 3519 | len = sysfs_emit(buf, "%s\n", session->targetname); |
a54a52ca | 3520 | break; |
3c5c4801 | 3521 | case ISCSI_PARAM_TARGET_ALIAS: |
ec98ea70 | 3522 | len = sysfs_emit(buf, "%s\n", session->targetalias); |
3c5c4801 | 3523 | break; |
a54a52ca | 3524 | case ISCSI_PARAM_TPGT: |
ec98ea70 | 3525 | len = sysfs_emit(buf, "%d\n", session->tpgt); |
a54a52ca | 3526 | break; |
b2c64167 | 3527 | case ISCSI_PARAM_USERNAME: |
ec98ea70 | 3528 | len = sysfs_emit(buf, "%s\n", session->username); |
b2c64167 MC |
3529 | break; |
3530 | case ISCSI_PARAM_USERNAME_IN: | |
ec98ea70 | 3531 | len = sysfs_emit(buf, "%s\n", session->username_in); |
b2c64167 MC |
3532 | break; |
3533 | case ISCSI_PARAM_PASSWORD: | |
ec98ea70 | 3534 | len = sysfs_emit(buf, "%s\n", session->password); |
b2c64167 MC |
3535 | break; |
3536 | case ISCSI_PARAM_PASSWORD_IN: | |
ec98ea70 | 3537 | len = sysfs_emit(buf, "%s\n", session->password_in); |
b2c64167 | 3538 | break; |
88dfd340 | 3539 | case ISCSI_PARAM_IFACE_NAME: |
ec98ea70 | 3540 | len = sysfs_emit(buf, "%s\n", session->ifacename); |
88dfd340 MC |
3541 | break; |
3542 | case ISCSI_PARAM_INITIATOR_NAME: | |
ec98ea70 | 3543 | len = sysfs_emit(buf, "%s\n", session->initiatorname); |
88dfd340 | 3544 | break; |
3b9373e9 | 3545 | case ISCSI_PARAM_BOOT_ROOT: |
ec98ea70 | 3546 | len = sysfs_emit(buf, "%s\n", session->boot_root); |
3b9373e9 EW |
3547 | break; |
3548 | case ISCSI_PARAM_BOOT_NIC: | |
ec98ea70 | 3549 | len = sysfs_emit(buf, "%s\n", session->boot_nic); |
3b9373e9 EW |
3550 | break; |
3551 | case ISCSI_PARAM_BOOT_TARGET: | |
ec98ea70 | 3552 | len = sysfs_emit(buf, "%s\n", session->boot_target); |
9a2307b1 | 3553 | break; |
f8525eb4 | 3554 | case ISCSI_PARAM_AUTO_SND_TGT_DISABLE: |
ec98ea70 | 3555 | len = sysfs_emit(buf, "%u\n", session->auto_snd_tgt_disable); |
f8525eb4 AC |
3556 | break; |
3557 | case ISCSI_PARAM_DISCOVERY_SESS: | |
ec98ea70 | 3558 | len = sysfs_emit(buf, "%u\n", session->discovery_sess); |
f8525eb4 AC |
3559 | break; |
3560 | case ISCSI_PARAM_PORTAL_TYPE: | |
ec98ea70 | 3561 | len = sysfs_emit(buf, "%s\n", session->portal_type); |
f8525eb4 AC |
3562 | break; |
3563 | case ISCSI_PARAM_CHAP_AUTH_EN: | |
ec98ea70 | 3564 | len = sysfs_emit(buf, "%u\n", session->chap_auth_en); |
f8525eb4 AC |
3565 | break; |
3566 | case ISCSI_PARAM_DISCOVERY_LOGOUT_EN: | |
ec98ea70 | 3567 | len = sysfs_emit(buf, "%u\n", session->discovery_logout_en); |
f8525eb4 AC |
3568 | break; |
3569 | case ISCSI_PARAM_BIDI_CHAP_EN: | |
ec98ea70 | 3570 | len = sysfs_emit(buf, "%u\n", session->bidi_chap_en); |
f8525eb4 AC |
3571 | break; |
3572 | case ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL: | |
ec98ea70 | 3573 | len = sysfs_emit(buf, "%u\n", session->discovery_auth_optional); |
f8525eb4 AC |
3574 | break; |
3575 | case ISCSI_PARAM_DEF_TIME2WAIT: | |
ec98ea70 | 3576 | len = sysfs_emit(buf, "%d\n", session->time2wait); |
f8525eb4 AC |
3577 | break; |
3578 | case ISCSI_PARAM_DEF_TIME2RETAIN: | |
ec98ea70 | 3579 | len = sysfs_emit(buf, "%d\n", session->time2retain); |
f8525eb4 AC |
3580 | break; |
3581 | case ISCSI_PARAM_TSID: | |
ec98ea70 | 3582 | len = sysfs_emit(buf, "%u\n", session->tsid); |
f8525eb4 AC |
3583 | break; |
3584 | case ISCSI_PARAM_ISID: | |
ec98ea70 | 3585 | len = sysfs_emit(buf, "%02x%02x%02x%02x%02x%02x\n", |
f8525eb4 AC |
3586 | session->isid[0], session->isid[1], |
3587 | session->isid[2], session->isid[3], | |
3588 | session->isid[4], session->isid[5]); | |
3589 | break; | |
3590 | case ISCSI_PARAM_DISCOVERY_PARENT_IDX: | |
ec98ea70 | 3591 | len = sysfs_emit(buf, "%u\n", session->discovery_parent_idx); |
f8525eb4 AC |
3592 | break; |
3593 | case ISCSI_PARAM_DISCOVERY_PARENT_TYPE: | |
3594 | if (session->discovery_parent_type) | |
ec98ea70 | 3595 | len = sysfs_emit(buf, "%s\n", |
f8525eb4 AC |
3596 | session->discovery_parent_type); |
3597 | else | |
ec98ea70 | 3598 | len = sysfs_emit(buf, "\n"); |
3b9373e9 | 3599 | break; |
a54a52ca MC |
3600 | default: |
3601 | return -ENOSYS; | |
3602 | } | |
3603 | ||
3604 | return len; | |
3605 | } | |
3606 | EXPORT_SYMBOL_GPL(iscsi_session_get_param); | |
3607 | ||
00f3708e MC |
3608 | int iscsi_conn_get_addr_param(struct sockaddr_storage *addr, |
3609 | enum iscsi_param param, char *buf) | |
3610 | { | |
3611 | struct sockaddr_in6 *sin6 = NULL; | |
3612 | struct sockaddr_in *sin = NULL; | |
3613 | int len; | |
3614 | ||
3615 | switch (addr->ss_family) { | |
3616 | case AF_INET: | |
3617 | sin = (struct sockaddr_in *)addr; | |
3618 | break; | |
3619 | case AF_INET6: | |
3620 | sin6 = (struct sockaddr_in6 *)addr; | |
3621 | break; | |
3622 | default: | |
3623 | return -EINVAL; | |
3624 | } | |
3625 | ||
3626 | switch (param) { | |
3627 | case ISCSI_PARAM_CONN_ADDRESS: | |
3628 | case ISCSI_HOST_PARAM_IPADDRESS: | |
3629 | if (sin) | |
ec98ea70 | 3630 | len = sysfs_emit(buf, "%pI4\n", &sin->sin_addr.s_addr); |
00f3708e | 3631 | else |
ec98ea70 | 3632 | len = sysfs_emit(buf, "%pI6\n", &sin6->sin6_addr); |
00f3708e MC |
3633 | break; |
3634 | case ISCSI_PARAM_CONN_PORT: | |
4bfb8ebf | 3635 | case ISCSI_PARAM_LOCAL_PORT: |
00f3708e | 3636 | if (sin) |
ec98ea70 | 3637 | len = sysfs_emit(buf, "%hu\n", be16_to_cpu(sin->sin_port)); |
00f3708e | 3638 | else |
ec98ea70 | 3639 | len = sysfs_emit(buf, "%hu\n", |
00f3708e MC |
3640 | be16_to_cpu(sin6->sin6_port)); |
3641 | break; | |
3642 | default: | |
3643 | return -EINVAL; | |
3644 | } | |
3645 | ||
3646 | return len; | |
3647 | } | |
3648 | EXPORT_SYMBOL_GPL(iscsi_conn_get_addr_param); | |
3649 | ||
a54a52ca MC |
3650 | int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn, |
3651 | enum iscsi_param param, char *buf) | |
3652 | { | |
3653 | struct iscsi_conn *conn = cls_conn->dd_data; | |
3654 | int len; | |
3655 | ||
3656 | switch(param) { | |
f6d5180c | 3657 | case ISCSI_PARAM_PING_TMO: |
ec98ea70 | 3658 | len = sysfs_emit(buf, "%u\n", conn->ping_timeout); |
f6d5180c MC |
3659 | break; |
3660 | case ISCSI_PARAM_RECV_TMO: | |
ec98ea70 | 3661 | len = sysfs_emit(buf, "%u\n", conn->recv_timeout); |
f6d5180c | 3662 | break; |
a54a52ca | 3663 | case ISCSI_PARAM_MAX_RECV_DLENGTH: |
ec98ea70 | 3664 | len = sysfs_emit(buf, "%u\n", conn->max_recv_dlength); |
a54a52ca MC |
3665 | break; |
3666 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
ec98ea70 | 3667 | len = sysfs_emit(buf, "%u\n", conn->max_xmit_dlength); |
a54a52ca MC |
3668 | break; |
3669 | case ISCSI_PARAM_HDRDGST_EN: | |
ec98ea70 | 3670 | len = sysfs_emit(buf, "%d\n", conn->hdrdgst_en); |
a54a52ca MC |
3671 | break; |
3672 | case ISCSI_PARAM_DATADGST_EN: | |
ec98ea70 | 3673 | len = sysfs_emit(buf, "%d\n", conn->datadgst_en); |
a54a52ca MC |
3674 | break; |
3675 | case ISCSI_PARAM_IFMARKER_EN: | |
ec98ea70 | 3676 | len = sysfs_emit(buf, "%d\n", conn->ifmarker_en); |
a54a52ca MC |
3677 | break; |
3678 | case ISCSI_PARAM_OFMARKER_EN: | |
ec98ea70 | 3679 | len = sysfs_emit(buf, "%d\n", conn->ofmarker_en); |
a54a52ca MC |
3680 | break; |
3681 | case ISCSI_PARAM_EXP_STATSN: | |
ec98ea70 | 3682 | len = sysfs_emit(buf, "%u\n", conn->exp_statsn); |
a54a52ca MC |
3683 | break; |
3684 | case ISCSI_PARAM_PERSISTENT_PORT: | |
ec98ea70 | 3685 | len = sysfs_emit(buf, "%d\n", conn->persistent_port); |
a54a52ca MC |
3686 | break; |
3687 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
ec98ea70 | 3688 | len = sysfs_emit(buf, "%s\n", conn->persistent_address); |
a54a52ca | 3689 | break; |
f8525eb4 | 3690 | case ISCSI_PARAM_STATSN: |
ec98ea70 | 3691 | len = sysfs_emit(buf, "%u\n", conn->statsn); |
f8525eb4 AC |
3692 | break; |
3693 | case ISCSI_PARAM_MAX_SEGMENT_SIZE: | |
ec98ea70 | 3694 | len = sysfs_emit(buf, "%u\n", conn->max_segment_size); |
f8525eb4 AC |
3695 | break; |
3696 | case ISCSI_PARAM_KEEPALIVE_TMO: | |
ec98ea70 | 3697 | len = sysfs_emit(buf, "%u\n", conn->keepalive_tmo); |
f8525eb4 AC |
3698 | break; |
3699 | case ISCSI_PARAM_LOCAL_PORT: | |
ec98ea70 | 3700 | len = sysfs_emit(buf, "%u\n", conn->local_port); |
f8525eb4 AC |
3701 | break; |
3702 | case ISCSI_PARAM_TCP_TIMESTAMP_STAT: | |
ec98ea70 | 3703 | len = sysfs_emit(buf, "%u\n", conn->tcp_timestamp_stat); |
f8525eb4 AC |
3704 | break; |
3705 | case ISCSI_PARAM_TCP_NAGLE_DISABLE: | |
ec98ea70 | 3706 | len = sysfs_emit(buf, "%u\n", conn->tcp_nagle_disable); |
f8525eb4 AC |
3707 | break; |
3708 | case ISCSI_PARAM_TCP_WSF_DISABLE: | |
ec98ea70 | 3709 | len = sysfs_emit(buf, "%u\n", conn->tcp_wsf_disable); |
f8525eb4 AC |
3710 | break; |
3711 | case ISCSI_PARAM_TCP_TIMER_SCALE: | |
ec98ea70 | 3712 | len = sysfs_emit(buf, "%u\n", conn->tcp_timer_scale); |
f8525eb4 AC |
3713 | break; |
3714 | case ISCSI_PARAM_TCP_TIMESTAMP_EN: | |
ec98ea70 | 3715 | len = sysfs_emit(buf, "%u\n", conn->tcp_timestamp_en); |
f8525eb4 AC |
3716 | break; |
3717 | case ISCSI_PARAM_IP_FRAGMENT_DISABLE: | |
ec98ea70 | 3718 | len = sysfs_emit(buf, "%u\n", conn->fragment_disable); |
f8525eb4 AC |
3719 | break; |
3720 | case ISCSI_PARAM_IPV4_TOS: | |
ec98ea70 | 3721 | len = sysfs_emit(buf, "%u\n", conn->ipv4_tos); |
f8525eb4 AC |
3722 | break; |
3723 | case ISCSI_PARAM_IPV6_TC: | |
ec98ea70 | 3724 | len = sysfs_emit(buf, "%u\n", conn->ipv6_traffic_class); |
f8525eb4 | 3725 | break; |
5f09e1f3 | 3726 | case ISCSI_PARAM_IPV6_FLOW_LABEL: |
ec98ea70 | 3727 | len = sysfs_emit(buf, "%u\n", conn->ipv6_flow_label); |
5f09e1f3 | 3728 | break; |
f8525eb4 | 3729 | case ISCSI_PARAM_IS_FW_ASSIGNED_IPV6: |
ec98ea70 | 3730 | len = sysfs_emit(buf, "%u\n", conn->is_fw_assigned_ipv6); |
f8525eb4 AC |
3731 | break; |
3732 | case ISCSI_PARAM_TCP_XMIT_WSF: | |
ec98ea70 | 3733 | len = sysfs_emit(buf, "%u\n", conn->tcp_xmit_wsf); |
f8525eb4 AC |
3734 | break; |
3735 | case ISCSI_PARAM_TCP_RECV_WSF: | |
ec98ea70 | 3736 | len = sysfs_emit(buf, "%u\n", conn->tcp_recv_wsf); |
f8525eb4 | 3737 | break; |
ae56ff40 | 3738 | case ISCSI_PARAM_LOCAL_IPADDR: |
ec98ea70 | 3739 | len = sysfs_emit(buf, "%s\n", conn->local_ipaddr); |
ae56ff40 | 3740 | break; |
a54a52ca MC |
3741 | default: |
3742 | return -ENOSYS; | |
3743 | } | |
3744 | ||
3745 | return len; | |
3746 | } | |
3747 | EXPORT_SYMBOL_GPL(iscsi_conn_get_param); | |
3748 | ||
0801c242 MC |
3749 | int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param, |
3750 | char *buf) | |
3751 | { | |
75613521 | 3752 | struct iscsi_host *ihost = shost_priv(shost); |
0801c242 MC |
3753 | int len; |
3754 | ||
3755 | switch (param) { | |
d8196ed2 | 3756 | case ISCSI_HOST_PARAM_NETDEV_NAME: |
ec98ea70 | 3757 | len = sysfs_emit(buf, "%s\n", ihost->netdev); |
d8196ed2 | 3758 | break; |
0801c242 | 3759 | case ISCSI_HOST_PARAM_HWADDRESS: |
ec98ea70 | 3760 | len = sysfs_emit(buf, "%s\n", ihost->hwaddress); |
0801c242 | 3761 | break; |
8ad5781a | 3762 | case ISCSI_HOST_PARAM_INITIATOR_NAME: |
ec98ea70 | 3763 | len = sysfs_emit(buf, "%s\n", ihost->initiatorname); |
8ad5781a | 3764 | break; |
0801c242 MC |
3765 | default: |
3766 | return -ENOSYS; | |
3767 | } | |
3768 | ||
3769 | return len; | |
3770 | } | |
3771 | EXPORT_SYMBOL_GPL(iscsi_host_get_param); | |
3772 | ||
3773 | int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param, | |
3774 | char *buf, int buflen) | |
3775 | { | |
75613521 | 3776 | struct iscsi_host *ihost = shost_priv(shost); |
0801c242 MC |
3777 | |
3778 | switch (param) { | |
d8196ed2 | 3779 | case ISCSI_HOST_PARAM_NETDEV_NAME: |
5700b1af | 3780 | return iscsi_switch_str_param(&ihost->netdev, buf); |
0801c242 | 3781 | case ISCSI_HOST_PARAM_HWADDRESS: |
5700b1af | 3782 | return iscsi_switch_str_param(&ihost->hwaddress, buf); |
8ad5781a | 3783 | case ISCSI_HOST_PARAM_INITIATOR_NAME: |
5700b1af | 3784 | return iscsi_switch_str_param(&ihost->initiatorname, buf); |
0801c242 MC |
3785 | default: |
3786 | return -ENOSYS; | |
3787 | } | |
3788 | ||
3789 | return 0; | |
3790 | } | |
3791 | EXPORT_SYMBOL_GPL(iscsi_host_set_param); | |
3792 | ||
7996a778 MC |
3793 | MODULE_AUTHOR("Mike Christie"); |
3794 | MODULE_DESCRIPTION("iSCSI library functions"); | |
3795 | MODULE_LICENSE("GPL"); |