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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 | { | |
233 | struct iscsi_conn *conn = task->conn; | |
234 | struct iscsi_tm *tmf = &conn->tmhdr; | |
9cb78c16 | 235 | u64 hdr_lun; |
5d12c05e MC |
236 | |
237 | if (conn->tmf_state == TMF_INITIAL) | |
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) { | |
257 | iscsi_conn_printk(KERN_INFO, conn, | |
a17037e7 | 258 | "task [op %x itt " |
3fe5ae8b | 259 | "0x%x/0x%x] " |
5d12c05e | 260 | "rejected.\n", |
a17037e7 VP |
261 | opcode, task->itt, |
262 | task->hdr_itt); | |
5d12c05e MC |
263 | return -EACCES; |
264 | } | |
265 | /* | |
266 | * And also all data-out PDUs in response to R2T | |
267 | * if fast_abort is set. | |
268 | */ | |
269 | if (conn->session->fast_abort) { | |
270 | iscsi_conn_printk(KERN_INFO, conn, | |
a17037e7 | 271 | "task [op %x itt " |
3fe5ae8b | 272 | "0x%x/0x%x] fast abort.\n", |
a17037e7 VP |
273 | opcode, task->itt, |
274 | task->hdr_itt); | |
5d12c05e MC |
275 | return -EACCES; |
276 | } | |
277 | break; | |
278 | case ISCSI_TM_FUNC_ABORT_TASK: | |
279 | /* | |
280 | * the caller has already checked if the task | |
281 | * they want to abort was in the pending queue so if | |
282 | * we are here the cmd pdu has gone out already, and | |
283 | * we will only hit this for data-outs | |
284 | */ | |
285 | if (opcode == ISCSI_OP_SCSI_DATA_OUT && | |
286 | task->hdr_itt == tmf->rtt) { | |
287 | ISCSI_DBG_SESSION(conn->session, | |
288 | "Preventing task %x/%x from sending " | |
289 | "data-out due to abort task in " | |
290 | "progress\n", task->itt, | |
291 | task->hdr_itt); | |
292 | return -EACCES; | |
293 | } | |
294 | break; | |
295 | } | |
296 | ||
297 | return 0; | |
298 | } | |
299 | ||
7996a778 MC |
300 | /** |
301 | * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu | |
9c19a7d0 | 302 | * @task: iscsi task |
7996a778 MC |
303 | * |
304 | * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set | |
305 | * fields like dlength or final based on how much data it sends | |
306 | */ | |
9c19a7d0 | 307 | static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task) |
7996a778 | 308 | { |
9c19a7d0 | 309 | struct iscsi_conn *conn = task->conn; |
7996a778 | 310 | struct iscsi_session *session = conn->session; |
9c19a7d0 | 311 | struct scsi_cmnd *sc = task->sc; |
12352183 | 312 | struct iscsi_scsi_req *hdr; |
d77e6535 | 313 | unsigned hdrlength, cmd_len, transfer_length; |
262ef636 | 314 | itt_t itt; |
004d6530 | 315 | int rc; |
7996a778 | 316 | |
5d12c05e MC |
317 | rc = iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_CMD); |
318 | if (rc) | |
319 | return rc; | |
320 | ||
184b57c6 MC |
321 | if (conn->session->tt->alloc_pdu) { |
322 | rc = conn->session->tt->alloc_pdu(task, ISCSI_OP_SCSI_CMD); | |
323 | if (rc) | |
324 | return rc; | |
325 | } | |
12352183 | 326 | hdr = (struct iscsi_scsi_req *)task->hdr; |
262ef636 | 327 | itt = hdr->itt; |
577577da MC |
328 | memset(hdr, 0, sizeof(*hdr)); |
329 | ||
2ff79d52 MC |
330 | if (session->tt->parse_pdu_itt) |
331 | hdr->itt = task->hdr_itt = itt; | |
332 | else | |
333 | hdr->itt = task->hdr_itt = build_itt(task->itt, | |
334 | task->conn->session->age); | |
9c19a7d0 MC |
335 | task->hdr_len = 0; |
336 | rc = iscsi_add_hdr(task, sizeof(*hdr)); | |
004d6530 BH |
337 | if (rc) |
338 | return rc; | |
a8ac6311 OK |
339 | hdr->opcode = ISCSI_OP_SCSI_CMD; |
340 | hdr->flags = ISCSI_ATTR_SIMPLE; | |
55bdabdf AG |
341 | int_to_scsilun(sc->device->lun, &hdr->lun); |
342 | task->lun = hdr->lun; | |
a8ac6311 | 343 | hdr->exp_statsn = cpu_to_be32(conn->exp_statsn); |
38d1c069 BH |
344 | cmd_len = sc->cmd_len; |
345 | if (cmd_len < ISCSI_CDB_SIZE) | |
346 | memset(&hdr->cdb[cmd_len], 0, ISCSI_CDB_SIZE - cmd_len); | |
347 | else if (cmd_len > ISCSI_CDB_SIZE) { | |
9c19a7d0 | 348 | rc = iscsi_prep_ecdb_ahs(task); |
38d1c069 BH |
349 | if (rc) |
350 | return rc; | |
351 | cmd_len = ISCSI_CDB_SIZE; | |
352 | } | |
353 | memcpy(hdr->cdb, sc->cmnd, cmd_len); | |
7996a778 | 354 | |
9c19a7d0 | 355 | task->imm_count = 0; |
55e51eda SG |
356 | if (scsi_get_prot_op(sc) != SCSI_PROT_NORMAL) |
357 | task->protected = true; | |
358 | ||
d77e6535 SG |
359 | transfer_length = scsi_transfer_length(sc); |
360 | hdr->data_length = cpu_to_be32(transfer_length); | |
7996a778 | 361 | if (sc->sc_data_direction == DMA_TO_DEVICE) { |
577577da MC |
362 | struct iscsi_r2t_info *r2t = &task->unsol_r2t; |
363 | ||
7996a778 MC |
364 | hdr->flags |= ISCSI_FLAG_CMD_WRITE; |
365 | /* | |
366 | * Write counters: | |
367 | * | |
368 | * imm_count bytes to be sent right after | |
369 | * SCSI PDU Header | |
370 | * | |
371 | * unsol_count bytes(as Data-Out) to be sent | |
372 | * without R2T ack right after | |
373 | * immediate data | |
374 | * | |
577577da | 375 | * r2t data_length bytes to be sent via R2T ack's |
7996a778 MC |
376 | * |
377 | * pad_count bytes to be sent as zero-padding | |
378 | */ | |
577577da | 379 | memset(r2t, 0, sizeof(*r2t)); |
7996a778 MC |
380 | |
381 | if (session->imm_data_en) { | |
d77e6535 | 382 | if (transfer_length >= session->first_burst) |
9c19a7d0 | 383 | task->imm_count = min(session->first_burst, |
7996a778 MC |
384 | conn->max_xmit_dlength); |
385 | else | |
d77e6535 SG |
386 | task->imm_count = min(transfer_length, |
387 | conn->max_xmit_dlength); | |
9c19a7d0 | 388 | hton24(hdr->dlength, task->imm_count); |
7996a778 | 389 | } else |
a8ac6311 | 390 | zero_data(hdr->dlength); |
7996a778 | 391 | |
ffd0436e | 392 | if (!session->initial_r2t_en) { |
d77e6535 SG |
393 | r2t->data_length = min(session->first_burst, |
394 | transfer_length) - | |
577577da MC |
395 | task->imm_count; |
396 | r2t->data_offset = task->imm_count; | |
397 | r2t->ttt = cpu_to_be32(ISCSI_RESERVED_TAG); | |
398 | r2t->exp_statsn = cpu_to_be32(conn->exp_statsn); | |
ffd0436e MC |
399 | } |
400 | ||
577577da | 401 | if (!task->unsol_r2t.data_length) |
7996a778 | 402 | /* No unsolicit Data-Out's */ |
a8ac6311 | 403 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; |
7996a778 | 404 | } else { |
7996a778 MC |
405 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; |
406 | zero_data(hdr->dlength); | |
407 | ||
408 | if (sc->sc_data_direction == DMA_FROM_DEVICE) | |
409 | hdr->flags |= ISCSI_FLAG_CMD_READ; | |
410 | } | |
411 | ||
004d6530 | 412 | /* calculate size of additional header segments (AHSs) */ |
9c19a7d0 | 413 | hdrlength = task->hdr_len - sizeof(*hdr); |
004d6530 BH |
414 | |
415 | WARN_ON(hdrlength & (ISCSI_PAD_LEN-1)); | |
416 | hdrlength /= ISCSI_PAD_LEN; | |
417 | ||
418 | WARN_ON(hdrlength >= 256); | |
419 | hdr->hlength = hdrlength & 0xFF; | |
96b1f96d | 420 | hdr->cmdsn = task->cmdsn = cpu_to_be32(session->cmdsn); |
004d6530 | 421 | |
577577da | 422 | if (session->tt->init_task && session->tt->init_task(task)) |
052d0144 MC |
423 | return -EIO; |
424 | ||
9c19a7d0 | 425 | task->state = ISCSI_TASK_RUNNING; |
d3305f34 | 426 | session->cmdsn++; |
77a23c21 | 427 | |
a8ac6311 | 428 | conn->scsicmd_pdus_cnt++; |
1b2c7af8 | 429 | ISCSI_DBG_SESSION(session, "iscsi prep [%s cid %d sc %p cdb 0x%x " |
ae3d56d8 | 430 | "itt 0x%x len %d cmdsn %d win %d]\n", |
1b2c7af8 MC |
431 | sc->sc_data_direction == DMA_TO_DEVICE ? |
432 | "write" : "read", conn->id, sc, sc->cmnd[0], | |
d77e6535 | 433 | task->itt, transfer_length, |
1b2c7af8 MC |
434 | session->cmdsn, |
435 | session->max_cmdsn - session->exp_cmdsn + 1); | |
004d6530 | 436 | return 0; |
7996a778 | 437 | } |
7996a778 MC |
438 | |
439 | /** | |
3bbaaad9 | 440 | * iscsi_free_task - free a task |
9c19a7d0 | 441 | * @task: iscsi cmd task |
7996a778 | 442 | * |
659743b0 | 443 | * Must be called with session back_lock. |
3e5c28ad MC |
444 | * This function returns the scsi command to scsi-ml or cleans |
445 | * up mgmt tasks then returns the task to the pool. | |
7996a778 | 446 | */ |
3bbaaad9 | 447 | static void iscsi_free_task(struct iscsi_task *task) |
7996a778 | 448 | { |
9c19a7d0 | 449 | struct iscsi_conn *conn = task->conn; |
c1635cb7 | 450 | struct iscsi_session *session = conn->session; |
9c19a7d0 | 451 | struct scsi_cmnd *sc = task->sc; |
f41d4721 | 452 | int oldstate = task->state; |
7996a778 | 453 | |
4421c9eb MC |
454 | ISCSI_DBG_SESSION(session, "freeing task itt 0x%x state %d sc %p\n", |
455 | task->itt, task->state, task->sc); | |
456 | ||
577577da | 457 | session->tt->cleanup_task(task); |
3bbaaad9 | 458 | task->state = ISCSI_TASK_FREE; |
9c19a7d0 | 459 | task->sc = NULL; |
3e5c28ad | 460 | /* |
9c19a7d0 | 461 | * login task is preallocated so do not free |
3e5c28ad | 462 | */ |
9c19a7d0 | 463 | if (conn->login_task == task) |
3e5c28ad MC |
464 | return; |
465 | ||
7acd72eb | 466 | kfifo_in(&session->cmdpool.queue, (void*)&task, sizeof(void*)); |
052d0144 | 467 | |
3e5c28ad | 468 | if (sc) { |
3e5c28ad MC |
469 | /* SCSI eh reuses commands to verify us */ |
470 | sc->SCp.ptr = NULL; | |
471 | /* | |
f41d4721 MC |
472 | * queue command may call this to free the task, so |
473 | * it will decide how to return sc to scsi-ml. | |
3e5c28ad | 474 | */ |
f41d4721 | 475 | if (oldstate != ISCSI_TASK_REQUEUE_SCSIQ) |
3e5c28ad MC |
476 | sc->scsi_done(sc); |
477 | } | |
7996a778 MC |
478 | } |
479 | ||
913e5bf4 | 480 | void __iscsi_get_task(struct iscsi_task *task) |
60ecebf5 | 481 | { |
6dc618cd | 482 | refcount_inc(&task->refcount); |
60ecebf5 | 483 | } |
913e5bf4 | 484 | EXPORT_SYMBOL_GPL(__iscsi_get_task); |
60ecebf5 | 485 | |
8eea2f55 | 486 | void __iscsi_put_task(struct iscsi_task *task) |
60ecebf5 | 487 | { |
6dc618cd | 488 | if (refcount_dec_and_test(&task->refcount)) |
3bbaaad9 | 489 | iscsi_free_task(task); |
60ecebf5 | 490 | } |
8eea2f55 | 491 | EXPORT_SYMBOL_GPL(__iscsi_put_task); |
60ecebf5 | 492 | |
9c19a7d0 | 493 | void iscsi_put_task(struct iscsi_task *task) |
3e5c28ad | 494 | { |
9c19a7d0 | 495 | struct iscsi_session *session = task->conn->session; |
3e5c28ad | 496 | |
659743b0 SP |
497 | /* regular RX path uses back_lock */ |
498 | spin_lock_bh(&session->back_lock); | |
9c19a7d0 | 499 | __iscsi_put_task(task); |
659743b0 | 500 | spin_unlock_bh(&session->back_lock); |
3e5c28ad | 501 | } |
9c19a7d0 | 502 | EXPORT_SYMBOL_GPL(iscsi_put_task); |
3e5c28ad | 503 | |
3bbaaad9 MC |
504 | /** |
505 | * iscsi_complete_task - finish a task | |
506 | * @task: iscsi cmd task | |
b3cd5050 | 507 | * @state: state to complete task with |
3bbaaad9 | 508 | * |
659743b0 | 509 | * Must be called with session back_lock. |
3bbaaad9 | 510 | */ |
b3cd5050 | 511 | static void iscsi_complete_task(struct iscsi_task *task, int state) |
3bbaaad9 MC |
512 | { |
513 | struct iscsi_conn *conn = task->conn; | |
514 | ||
4421c9eb MC |
515 | ISCSI_DBG_SESSION(conn->session, |
516 | "complete task itt 0x%x state %d sc %p\n", | |
517 | task->itt, task->state, task->sc); | |
b3cd5050 MC |
518 | if (task->state == ISCSI_TASK_COMPLETED || |
519 | task->state == ISCSI_TASK_ABRT_TMF || | |
f41d4721 MC |
520 | task->state == ISCSI_TASK_ABRT_SESS_RECOV || |
521 | task->state == ISCSI_TASK_REQUEUE_SCSIQ) | |
3bbaaad9 MC |
522 | return; |
523 | WARN_ON_ONCE(task->state == ISCSI_TASK_FREE); | |
b3cd5050 | 524 | task->state = state; |
3bbaaad9 | 525 | |
fe0a8a95 LD |
526 | if (READ_ONCE(conn->ping_task) == task) |
527 | WRITE_ONCE(conn->ping_task, NULL); | |
3bbaaad9 MC |
528 | |
529 | /* release get from queueing */ | |
530 | __iscsi_put_task(task); | |
531 | } | |
532 | ||
4c0ba5d2 MC |
533 | /** |
534 | * iscsi_complete_scsi_task - finish scsi task normally | |
535 | * @task: iscsi task for scsi cmd | |
536 | * @exp_cmdsn: expected cmd sn in cpu format | |
537 | * @max_cmdsn: max cmd sn in cpu format | |
538 | * | |
539 | * This is used when drivers do not need or cannot perform | |
540 | * lower level pdu processing. | |
541 | * | |
659743b0 | 542 | * Called with session back_lock |
4c0ba5d2 MC |
543 | */ |
544 | void iscsi_complete_scsi_task(struct iscsi_task *task, | |
545 | uint32_t exp_cmdsn, uint32_t max_cmdsn) | |
546 | { | |
547 | struct iscsi_conn *conn = task->conn; | |
548 | ||
549 | ISCSI_DBG_SESSION(conn->session, "[itt 0x%x]\n", task->itt); | |
550 | ||
551 | conn->last_recv = jiffies; | |
552 | __iscsi_update_cmdsn(conn->session, exp_cmdsn, max_cmdsn); | |
553 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); | |
554 | } | |
555 | EXPORT_SYMBOL_GPL(iscsi_complete_scsi_task); | |
556 | ||
5923d64b MC |
557 | /* |
558 | * Must be called with back and frwd lock | |
559 | */ | |
560 | static bool cleanup_queued_task(struct iscsi_task *task) | |
561 | { | |
562 | struct iscsi_conn *conn = task->conn; | |
563 | bool early_complete = false; | |
564 | ||
565 | /* Bad target might have completed task while it was still running */ | |
566 | if (task->state == ISCSI_TASK_COMPLETED) | |
567 | early_complete = true; | |
568 | ||
569 | if (!list_empty(&task->running)) { | |
570 | list_del_init(&task->running); | |
571 | /* | |
572 | * If it's on a list but still running, this could be from | |
573 | * a bad target sending a rsp early, cleanup from a TMF, or | |
574 | * session recovery. | |
575 | */ | |
576 | if (task->state == ISCSI_TASK_RUNNING || | |
577 | task->state == ISCSI_TASK_COMPLETED) | |
578 | __iscsi_put_task(task); | |
579 | } | |
580 | ||
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) { | |
832 | sc->result = DRIVER_SENSE << 24 | | |
833 | SAM_STAT_CHECK_CONDITION; | |
834 | scsi_build_sense_buffer(1, sc->sense_buffer, | |
835 | ILLEGAL_REQUEST, 0x10, ascq); | |
a73c2a2f SG |
836 | scsi_set_sense_information(sc->sense_buffer, |
837 | SCSI_SENSE_BUFFERSIZE, | |
838 | sector); | |
55e51eda SG |
839 | goto out; |
840 | } | |
841 | } | |
842 | ||
7996a778 MC |
843 | if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) { |
844 | sc->result = DID_ERROR << 16; | |
845 | goto out; | |
846 | } | |
847 | ||
848 | if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) { | |
9b80cb4b | 849 | uint16_t senselen; |
7996a778 MC |
850 | |
851 | if (datalen < 2) { | |
852 | invalid_datalen: | |
322d739d MC |
853 | iscsi_conn_printk(KERN_ERR, conn, |
854 | "Got CHECK_CONDITION but invalid data " | |
855 | "buffer size of %d\n", datalen); | |
7996a778 MC |
856 | sc->result = DID_BAD_TARGET << 16; |
857 | goto out; | |
858 | } | |
859 | ||
8f333991 | 860 | senselen = get_unaligned_be16(data); |
7996a778 MC |
861 | if (datalen < senselen) |
862 | goto invalid_datalen; | |
863 | ||
864 | memcpy(sc->sense_buffer, data + 2, | |
9b80cb4b | 865 | min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE)); |
1b2c7af8 MC |
866 | ISCSI_DBG_SESSION(session, "copied %d bytes of sense\n", |
867 | min_t(uint16_t, senselen, | |
868 | SCSI_SENSE_BUFFERSIZE)); | |
7996a778 MC |
869 | } |
870 | ||
c07d4444 BH |
871 | if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW | |
872 | ISCSI_FLAG_CMD_BIDI_OVERFLOW)) { | |
ae3d56d8 | 873 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; |
c07d4444 BH |
874 | } |
875 | ||
7207fea4 BH |
876 | if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW | |
877 | ISCSI_FLAG_CMD_OVERFLOW)) { | |
7996a778 MC |
878 | int res_count = be32_to_cpu(rhdr->residual_count); |
879 | ||
7207fea4 BH |
880 | if (res_count > 0 && |
881 | (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || | |
882 | res_count <= scsi_bufflen(sc))) | |
c07d4444 | 883 | /* write side for bidi or uni-io set_resid */ |
1c138991 | 884 | scsi_set_resid(sc, res_count); |
7996a778 MC |
885 | else |
886 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
c07d4444 | 887 | } |
7996a778 | 888 | out: |
3bbaaad9 | 889 | ISCSI_DBG_SESSION(session, "cmd rsp done [sc %p res %d itt 0x%x]\n", |
1b2c7af8 | 890 | sc, sc->result, task->itt); |
7996a778 | 891 | conn->scsirsp_pdus_cnt++; |
b3cd5050 | 892 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); |
7996a778 MC |
893 | } |
894 | ||
1d9edf02 MC |
895 | /** |
896 | * iscsi_data_in_rsp - SCSI Data-In Response processing | |
897 | * @conn: iscsi connection | |
898 | * @hdr: iscsi pdu | |
899 | * @task: scsi command task | |
a656183e LD |
900 | * |
901 | * iscsi_data_in_rsp sets up the scsi_cmnd fields based on the data received | |
902 | * then completes the command and task. called under back_lock | |
1d9edf02 MC |
903 | **/ |
904 | static void | |
905 | iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
906 | struct iscsi_task *task) | |
907 | { | |
908 | struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)hdr; | |
909 | struct scsi_cmnd *sc = task->sc; | |
910 | ||
911 | if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS)) | |
912 | return; | |
913 | ||
edbc9aa0 | 914 | iscsi_update_cmdsn(conn->session, (struct iscsi_nopin *)hdr); |
1d9edf02 MC |
915 | sc->result = (DID_OK << 16) | rhdr->cmd_status; |
916 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; | |
917 | if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW | | |
918 | ISCSI_FLAG_DATA_OVERFLOW)) { | |
919 | int res_count = be32_to_cpu(rhdr->residual_count); | |
920 | ||
921 | if (res_count > 0 && | |
922 | (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || | |
ae3d56d8 | 923 | res_count <= sc->sdb.length)) |
960bf87a | 924 | scsi_set_resid(sc, res_count); |
1d9edf02 MC |
925 | else |
926 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
927 | } | |
928 | ||
3bbaaad9 MC |
929 | ISCSI_DBG_SESSION(conn->session, "data in with status done " |
930 | "[sc %p res %d itt 0x%x]\n", | |
931 | sc, sc->result, task->itt); | |
1d9edf02 | 932 | conn->scsirsp_pdus_cnt++; |
b3cd5050 | 933 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); |
1d9edf02 MC |
934 | } |
935 | ||
7ea8b828 MC |
936 | static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr) |
937 | { | |
938 | struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr; | |
939 | ||
940 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
941 | conn->tmfrsp_pdus_cnt++; | |
942 | ||
843c0a8a | 943 | if (conn->tmf_state != TMF_QUEUED) |
7ea8b828 MC |
944 | return; |
945 | ||
946 | if (tmf->response == ISCSI_TMF_RSP_COMPLETE) | |
843c0a8a | 947 | conn->tmf_state = TMF_SUCCESS; |
7ea8b828 | 948 | else if (tmf->response == ISCSI_TMF_RSP_NO_TASK) |
843c0a8a | 949 | conn->tmf_state = TMF_NOT_FOUND; |
7ea8b828 | 950 | else |
843c0a8a | 951 | conn->tmf_state = TMF_FAILED; |
7ea8b828 MC |
952 | wake_up(&conn->ehwait); |
953 | } | |
954 | ||
52f5664a | 955 | static int iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr) |
f6d5180c MC |
956 | { |
957 | struct iscsi_nopout hdr; | |
9c19a7d0 | 958 | struct iscsi_task *task; |
f6d5180c | 959 | |
fe0a8a95 LD |
960 | if (!rhdr) { |
961 | if (READ_ONCE(conn->ping_task)) | |
962 | return -EINVAL; | |
963 | WRITE_ONCE(conn->ping_task, INVALID_SCSI_TASK); | |
964 | } | |
f6d5180c MC |
965 | |
966 | memset(&hdr, 0, sizeof(struct iscsi_nopout)); | |
967 | hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE; | |
968 | hdr.flags = ISCSI_FLAG_CMD_FINAL; | |
969 | ||
970 | if (rhdr) { | |
55bdabdf | 971 | hdr.lun = rhdr->lun; |
f6d5180c MC |
972 | hdr.ttt = rhdr->ttt; |
973 | hdr.itt = RESERVED_ITT; | |
974 | } else | |
975 | hdr.ttt = RESERVED_ITT; | |
976 | ||
9c19a7d0 | 977 | task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0); |
52f5664a | 978 | if (!task) { |
fe0a8a95 LD |
979 | if (!rhdr) |
980 | WRITE_ONCE(conn->ping_task, NULL); | |
322d739d | 981 | iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n"); |
52f5664a AN |
982 | return -EIO; |
983 | } else if (!rhdr) { | |
d3acf022 | 984 | /* only track our nops */ |
d3acf022 MC |
985 | conn->last_ping = jiffies; |
986 | } | |
52f5664a AN |
987 | |
988 | return 0; | |
f6d5180c MC |
989 | } |
990 | ||
a656183e LD |
991 | /** |
992 | * iscsi_nop_out_rsp - SCSI NOP Response processing | |
993 | * @task: scsi command task | |
994 | * @nop: the nop structure | |
995 | * @data: where to put the data | |
996 | * @datalen: length of data | |
997 | * | |
998 | * iscsi_nop_out_rsp handles nop response from use or | |
999 | * from user space. called under back_lock | |
1000 | **/ | |
8afa1439 MC |
1001 | static int iscsi_nop_out_rsp(struct iscsi_task *task, |
1002 | struct iscsi_nopin *nop, char *data, int datalen) | |
1003 | { | |
1004 | struct iscsi_conn *conn = task->conn; | |
1005 | int rc = 0; | |
1006 | ||
fe0a8a95 | 1007 | if (READ_ONCE(conn->ping_task) != task) { |
8afa1439 MC |
1008 | /* |
1009 | * If this is not in response to one of our | |
1010 | * nops then it must be from userspace. | |
1011 | */ | |
1012 | if (iscsi_recv_pdu(conn->cls_conn, (struct iscsi_hdr *)nop, | |
1013 | data, datalen)) | |
1014 | rc = ISCSI_ERR_CONN_FAILED; | |
1015 | } else | |
1016 | mod_timer(&conn->transport_timer, jiffies + conn->recv_timeout); | |
1017 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); | |
1018 | return rc; | |
1019 | } | |
1020 | ||
62f38300 MC |
1021 | static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
1022 | char *data, int datalen) | |
1023 | { | |
1024 | struct iscsi_reject *reject = (struct iscsi_reject *)hdr; | |
1025 | struct iscsi_hdr rejected_pdu; | |
8afa1439 | 1026 | int opcode, rc = 0; |
62f38300 MC |
1027 | |
1028 | conn->exp_statsn = be32_to_cpu(reject->statsn) + 1; | |
1029 | ||
8afa1439 MC |
1030 | if (ntoh24(reject->dlength) > datalen || |
1031 | ntoh24(reject->dlength) < sizeof(struct iscsi_hdr)) { | |
1032 | iscsi_conn_printk(KERN_ERR, conn, "Cannot handle rejected " | |
1033 | "pdu. Invalid data length (pdu dlength " | |
1034 | "%u, datalen %d\n", ntoh24(reject->dlength), | |
1035 | datalen); | |
1036 | return ISCSI_ERR_PROTO; | |
1037 | } | |
1038 | memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr)); | |
1039 | opcode = rejected_pdu.opcode & ISCSI_OPCODE_MASK; | |
1040 | ||
1041 | switch (reject->reason) { | |
1042 | case ISCSI_REASON_DATA_DIGEST_ERROR: | |
1043 | iscsi_conn_printk(KERN_ERR, conn, | |
1044 | "pdu (op 0x%x itt 0x%x) rejected " | |
1045 | "due to DataDigest error.\n", | |
e5dbbe27 | 1046 | opcode, rejected_pdu.itt); |
8afa1439 MC |
1047 | break; |
1048 | case ISCSI_REASON_IMM_CMD_REJECT: | |
1049 | iscsi_conn_printk(KERN_ERR, conn, | |
1050 | "pdu (op 0x%x itt 0x%x) rejected. Too many " | |
1051 | "immediate commands.\n", | |
e5dbbe27 | 1052 | opcode, rejected_pdu.itt); |
8afa1439 MC |
1053 | /* |
1054 | * We only send one TMF at a time so if the target could not | |
1055 | * handle it, then it should get fixed (RFC mandates that | |
1056 | * a target can handle one immediate TMF per conn). | |
1057 | * | |
1058 | * For nops-outs, we could have sent more than one if | |
1059 | * the target is sending us lots of nop-ins | |
1060 | */ | |
1061 | if (opcode != ISCSI_OP_NOOP_OUT) | |
1062 | return 0; | |
62f38300 | 1063 | |
4dec6a8f | 1064 | if (rejected_pdu.itt == cpu_to_be32(ISCSI_RESERVED_TAG)) { |
8afa1439 MC |
1065 | /* |
1066 | * nop-out in response to target's nop-out rejected. | |
1067 | * Just resend. | |
1068 | */ | |
659743b0 SP |
1069 | /* In RX path we are under back lock */ |
1070 | spin_unlock(&conn->session->back_lock); | |
1071 | spin_lock(&conn->session->frwd_lock); | |
8afa1439 MC |
1072 | iscsi_send_nopout(conn, |
1073 | (struct iscsi_nopin*)&rejected_pdu); | |
659743b0 SP |
1074 | spin_unlock(&conn->session->frwd_lock); |
1075 | spin_lock(&conn->session->back_lock); | |
1076 | } else { | |
8afa1439 MC |
1077 | struct iscsi_task *task; |
1078 | /* | |
1079 | * Our nop as ping got dropped. We know the target | |
1080 | * and transport are ok so just clean up | |
1081 | */ | |
1082 | task = iscsi_itt_to_task(conn, rejected_pdu.itt); | |
1083 | if (!task) { | |
1084 | iscsi_conn_printk(KERN_ERR, conn, | |
1085 | "Invalid pdu reject. Could " | |
1086 | "not lookup rejected task.\n"); | |
1087 | rc = ISCSI_ERR_BAD_ITT; | |
1088 | } else | |
1089 | rc = iscsi_nop_out_rsp(task, | |
1090 | (struct iscsi_nopin*)&rejected_pdu, | |
1091 | NULL, 0); | |
62f38300 | 1092 | } |
8afa1439 MC |
1093 | break; |
1094 | default: | |
1095 | iscsi_conn_printk(KERN_ERR, conn, | |
1096 | "pdu (op 0x%x itt 0x%x) rejected. Reason " | |
e5dbbe27 VC |
1097 | "code 0x%x\n", rejected_pdu.opcode, |
1098 | rejected_pdu.itt, reject->reason); | |
8afa1439 | 1099 | break; |
62f38300 | 1100 | } |
8afa1439 | 1101 | return rc; |
62f38300 MC |
1102 | } |
1103 | ||
913e5bf4 MC |
1104 | /** |
1105 | * iscsi_itt_to_task - look up task by itt | |
1106 | * @conn: iscsi connection | |
1107 | * @itt: itt | |
1108 | * | |
1109 | * This should be used for mgmt tasks like login and nops, or if | |
1110 | * the LDD's itt space does not include the session age. | |
1111 | * | |
659743b0 | 1112 | * The session back_lock must be held. |
913e5bf4 | 1113 | */ |
8f9256ce | 1114 | struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *conn, itt_t itt) |
913e5bf4 MC |
1115 | { |
1116 | struct iscsi_session *session = conn->session; | |
262ef636 | 1117 | int i; |
913e5bf4 MC |
1118 | |
1119 | if (itt == RESERVED_ITT) | |
1120 | return NULL; | |
1121 | ||
262ef636 MC |
1122 | if (session->tt->parse_pdu_itt) |
1123 | session->tt->parse_pdu_itt(conn, itt, &i, NULL); | |
1124 | else | |
1125 | i = get_itt(itt); | |
913e5bf4 MC |
1126 | if (i >= session->cmds_max) |
1127 | return NULL; | |
1128 | ||
1129 | return session->cmds[i]; | |
1130 | } | |
8f9256ce | 1131 | EXPORT_SYMBOL_GPL(iscsi_itt_to_task); |
913e5bf4 | 1132 | |
7996a778 MC |
1133 | /** |
1134 | * __iscsi_complete_pdu - complete pdu | |
1135 | * @conn: iscsi conn | |
1136 | * @hdr: iscsi header | |
1137 | * @data: data buffer | |
1138 | * @datalen: len of data buffer | |
1139 | * | |
1140 | * Completes pdu processing by freeing any resources allocated at | |
659743b0 | 1141 | * queuecommand or send generic. session back_lock must be held and verify |
7996a778 MC |
1142 | * itt must have been called. |
1143 | */ | |
913e5bf4 MC |
1144 | int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
1145 | char *data, int datalen) | |
7996a778 MC |
1146 | { |
1147 | struct iscsi_session *session = conn->session; | |
1148 | int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0; | |
9c19a7d0 | 1149 | struct iscsi_task *task; |
7996a778 MC |
1150 | uint32_t itt; |
1151 | ||
f6d5180c | 1152 | conn->last_recv = jiffies; |
0af967f5 MC |
1153 | rc = iscsi_verify_itt(conn, hdr->itt); |
1154 | if (rc) | |
1155 | return rc; | |
1156 | ||
b4377356 AV |
1157 | if (hdr->itt != RESERVED_ITT) |
1158 | itt = get_itt(hdr->itt); | |
7996a778 | 1159 | else |
b4377356 | 1160 | itt = ~0U; |
7996a778 | 1161 | |
1b2c7af8 MC |
1162 | ISCSI_DBG_SESSION(session, "[op 0x%x cid %d itt 0x%x len %d]\n", |
1163 | opcode, conn->id, itt, datalen); | |
7996a778 | 1164 | |
3e5c28ad | 1165 | if (itt == ~0U) { |
77a23c21 | 1166 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); |
62f38300 | 1167 | |
7996a778 MC |
1168 | switch(opcode) { |
1169 | case ISCSI_OP_NOOP_IN: | |
40527afe | 1170 | if (datalen) { |
7996a778 | 1171 | rc = ISCSI_ERR_PROTO; |
40527afe MC |
1172 | break; |
1173 | } | |
1174 | ||
b4377356 | 1175 | if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG)) |
40527afe MC |
1176 | break; |
1177 | ||
659743b0 SP |
1178 | /* In RX path we are under back lock */ |
1179 | spin_unlock(&session->back_lock); | |
1180 | spin_lock(&session->frwd_lock); | |
f6d5180c | 1181 | iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr); |
659743b0 SP |
1182 | spin_unlock(&session->frwd_lock); |
1183 | spin_lock(&session->back_lock); | |
7996a778 MC |
1184 | break; |
1185 | case ISCSI_OP_REJECT: | |
62f38300 MC |
1186 | rc = iscsi_handle_reject(conn, hdr, data, datalen); |
1187 | break; | |
7996a778 | 1188 | case ISCSI_OP_ASYNC_EVENT: |
8d2860b3 | 1189 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; |
5831c737 MC |
1190 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) |
1191 | rc = ISCSI_ERR_CONN_FAILED; | |
7996a778 MC |
1192 | break; |
1193 | default: | |
1194 | rc = ISCSI_ERR_BAD_OPCODE; | |
1195 | break; | |
1196 | } | |
3e5c28ad MC |
1197 | goto out; |
1198 | } | |
1199 | ||
3e5c28ad MC |
1200 | switch(opcode) { |
1201 | case ISCSI_OP_SCSI_CMD_RSP: | |
913e5bf4 MC |
1202 | case ISCSI_OP_SCSI_DATA_IN: |
1203 | task = iscsi_itt_to_ctask(conn, hdr->itt); | |
1204 | if (!task) | |
1205 | return ISCSI_ERR_BAD_ITT; | |
d355e57d | 1206 | task->last_xfer = jiffies; |
913e5bf4 MC |
1207 | break; |
1208 | case ISCSI_OP_R2T: | |
1209 | /* | |
1210 | * LLD handles R2Ts if they need to. | |
1211 | */ | |
1212 | return 0; | |
1213 | case ISCSI_OP_LOGOUT_RSP: | |
1214 | case ISCSI_OP_LOGIN_RSP: | |
1215 | case ISCSI_OP_TEXT_RSP: | |
1216 | case ISCSI_OP_SCSI_TMFUNC_RSP: | |
1217 | case ISCSI_OP_NOOP_IN: | |
1218 | task = iscsi_itt_to_task(conn, hdr->itt); | |
1219 | if (!task) | |
1220 | return ISCSI_ERR_BAD_ITT; | |
1221 | break; | |
1222 | default: | |
1223 | return ISCSI_ERR_BAD_OPCODE; | |
1224 | } | |
1225 | ||
1226 | switch(opcode) { | |
1227 | case ISCSI_OP_SCSI_CMD_RSP: | |
9c19a7d0 | 1228 | iscsi_scsi_cmd_rsp(conn, hdr, task, data, datalen); |
3e5c28ad MC |
1229 | break; |
1230 | case ISCSI_OP_SCSI_DATA_IN: | |
1d9edf02 | 1231 | iscsi_data_in_rsp(conn, hdr, task); |
3e5c28ad | 1232 | break; |
3e5c28ad MC |
1233 | case ISCSI_OP_LOGOUT_RSP: |
1234 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
1235 | if (datalen) { | |
1236 | rc = ISCSI_ERR_PROTO; | |
1237 | break; | |
1238 | } | |
1239 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
1240 | goto recv_pdu; | |
1241 | case ISCSI_OP_LOGIN_RSP: | |
1242 | case ISCSI_OP_TEXT_RSP: | |
1243 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
1244 | /* | |
1245 | * login related PDU's exp_statsn is handled in | |
1246 | * userspace | |
1247 | */ | |
1248 | goto recv_pdu; | |
1249 | case ISCSI_OP_SCSI_TMFUNC_RSP: | |
1250 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
1251 | if (datalen) { | |
1252 | rc = ISCSI_ERR_PROTO; | |
1253 | break; | |
1254 | } | |
1255 | ||
1256 | iscsi_tmf_rsp(conn, hdr); | |
b3cd5050 | 1257 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); |
3e5c28ad MC |
1258 | break; |
1259 | case ISCSI_OP_NOOP_IN: | |
1260 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
1261 | if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) { | |
1262 | rc = ISCSI_ERR_PROTO; | |
1263 | break; | |
1264 | } | |
1265 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
1266 | ||
8afa1439 MC |
1267 | rc = iscsi_nop_out_rsp(task, (struct iscsi_nopin*)hdr, |
1268 | data, datalen); | |
3e5c28ad MC |
1269 | break; |
1270 | default: | |
1271 | rc = ISCSI_ERR_BAD_OPCODE; | |
1272 | break; | |
1273 | } | |
7996a778 | 1274 | |
3e5c28ad MC |
1275 | out: |
1276 | return rc; | |
1277 | recv_pdu: | |
1278 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) | |
1279 | rc = ISCSI_ERR_CONN_FAILED; | |
b3cd5050 | 1280 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); |
7996a778 MC |
1281 | return rc; |
1282 | } | |
913e5bf4 | 1283 | EXPORT_SYMBOL_GPL(__iscsi_complete_pdu); |
7996a778 MC |
1284 | |
1285 | int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
1286 | char *data, int datalen) | |
1287 | { | |
1288 | int rc; | |
1289 | ||
659743b0 | 1290 | spin_lock(&conn->session->back_lock); |
7996a778 | 1291 | rc = __iscsi_complete_pdu(conn, hdr, data, datalen); |
659743b0 | 1292 | spin_unlock(&conn->session->back_lock); |
7996a778 MC |
1293 | return rc; |
1294 | } | |
1295 | EXPORT_SYMBOL_GPL(iscsi_complete_pdu); | |
1296 | ||
0af967f5 | 1297 | int iscsi_verify_itt(struct iscsi_conn *conn, itt_t itt) |
7996a778 MC |
1298 | { |
1299 | struct iscsi_session *session = conn->session; | |
262ef636 | 1300 | int age = 0, i = 0; |
7996a778 | 1301 | |
0af967f5 MC |
1302 | if (itt == RESERVED_ITT) |
1303 | return 0; | |
7996a778 | 1304 | |
262ef636 MC |
1305 | if (session->tt->parse_pdu_itt) |
1306 | session->tt->parse_pdu_itt(conn, itt, &i, &age); | |
1307 | else { | |
1308 | i = get_itt(itt); | |
1309 | age = ((__force u32)itt >> ISCSI_AGE_SHIFT) & ISCSI_AGE_MASK; | |
1310 | } | |
1311 | ||
1312 | if (age != session->age) { | |
0af967f5 MC |
1313 | iscsi_conn_printk(KERN_ERR, conn, |
1314 | "received itt %x expected session age (%x)\n", | |
913e5bf4 | 1315 | (__force u32)itt, session->age); |
0af967f5 MC |
1316 | return ISCSI_ERR_BAD_ITT; |
1317 | } | |
7996a778 | 1318 | |
3e5c28ad MC |
1319 | if (i >= session->cmds_max) { |
1320 | iscsi_conn_printk(KERN_ERR, conn, | |
1321 | "received invalid itt index %u (max cmds " | |
1322 | "%u.\n", i, session->cmds_max); | |
1323 | return ISCSI_ERR_BAD_ITT; | |
7996a778 | 1324 | } |
7996a778 MC |
1325 | return 0; |
1326 | } | |
1327 | EXPORT_SYMBOL_GPL(iscsi_verify_itt); | |
1328 | ||
913e5bf4 MC |
1329 | /** |
1330 | * iscsi_itt_to_ctask - look up ctask by itt | |
1331 | * @conn: iscsi connection | |
1332 | * @itt: itt | |
1333 | * | |
1334 | * This should be used for cmd tasks. | |
1335 | * | |
659743b0 | 1336 | * The session back_lock must be held. |
913e5bf4 MC |
1337 | */ |
1338 | struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *conn, itt_t itt) | |
0af967f5 | 1339 | { |
9c19a7d0 | 1340 | struct iscsi_task *task; |
0af967f5 MC |
1341 | |
1342 | if (iscsi_verify_itt(conn, itt)) | |
1343 | return NULL; | |
1344 | ||
913e5bf4 MC |
1345 | task = iscsi_itt_to_task(conn, itt); |
1346 | if (!task || !task->sc) | |
0af967f5 MC |
1347 | return NULL; |
1348 | ||
913e5bf4 MC |
1349 | if (task->sc->SCp.phase != conn->session->age) { |
1350 | iscsi_session_printk(KERN_ERR, conn->session, | |
1351 | "task's session age %d, expected %d\n", | |
1352 | task->sc->SCp.phase, conn->session->age); | |
0af967f5 | 1353 | return NULL; |
913e5bf4 | 1354 | } |
0af967f5 | 1355 | |
9c19a7d0 | 1356 | return task; |
0af967f5 MC |
1357 | } |
1358 | EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask); | |
1359 | ||
40a06e75 | 1360 | void iscsi_session_failure(struct iscsi_session *session, |
e5bd7b54 MC |
1361 | enum iscsi_err err) |
1362 | { | |
e5bd7b54 | 1363 | struct iscsi_conn *conn; |
e5bd7b54 | 1364 | |
659743b0 | 1365 | spin_lock_bh(&session->frwd_lock); |
e5bd7b54 MC |
1366 | conn = session->leadconn; |
1367 | if (session->state == ISCSI_STATE_TERMINATE || !conn) { | |
659743b0 | 1368 | spin_unlock_bh(&session->frwd_lock); |
e5bd7b54 MC |
1369 | return; |
1370 | } | |
1371 | ||
b1d19e8c | 1372 | iscsi_get_conn(conn->cls_conn); |
659743b0 | 1373 | spin_unlock_bh(&session->frwd_lock); |
e5bd7b54 MC |
1374 | /* |
1375 | * if the host is being removed bypass the connection | |
1376 | * recovery initialization because we are going to kill | |
1377 | * the session. | |
1378 | */ | |
1379 | if (err == ISCSI_ERR_INVALID_HOST) | |
1380 | iscsi_conn_error_event(conn->cls_conn, err); | |
1381 | else | |
1382 | iscsi_conn_failure(conn, err); | |
b1d19e8c | 1383 | iscsi_put_conn(conn->cls_conn); |
e5bd7b54 MC |
1384 | } |
1385 | EXPORT_SYMBOL_GPL(iscsi_session_failure); | |
1386 | ||
891e2639 | 1387 | static bool iscsi_set_conn_failed(struct iscsi_conn *conn) |
7996a778 MC |
1388 | { |
1389 | struct iscsi_session *session = conn->session; | |
7996a778 | 1390 | |
891e2639 MC |
1391 | if (session->state == ISCSI_STATE_FAILED) |
1392 | return false; | |
656cffc9 | 1393 | |
67a61114 | 1394 | if (conn->stop_stage == 0) |
7996a778 | 1395 | session->state = ISCSI_STATE_FAILED; |
e5bd7b54 | 1396 | |
7996a778 MC |
1397 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); |
1398 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
891e2639 MC |
1399 | return true; |
1400 | } | |
1401 | ||
1402 | void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err) | |
1403 | { | |
1404 | struct iscsi_session *session = conn->session; | |
1405 | bool needs_evt; | |
1406 | ||
1407 | spin_lock_bh(&session->frwd_lock); | |
1408 | needs_evt = iscsi_set_conn_failed(conn); | |
1409 | spin_unlock_bh(&session->frwd_lock); | |
1410 | ||
1411 | if (needs_evt) | |
1412 | iscsi_conn_error_event(conn->cls_conn, err); | |
7996a778 MC |
1413 | } |
1414 | EXPORT_SYMBOL_GPL(iscsi_conn_failure); | |
1415 | ||
77a23c21 MC |
1416 | static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn) |
1417 | { | |
1418 | struct iscsi_session *session = conn->session; | |
1419 | ||
1420 | /* | |
1421 | * Check for iSCSI window and take care of CmdSN wrap-around | |
1422 | */ | |
e0726407 | 1423 | if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) { |
1b2c7af8 MC |
1424 | ISCSI_DBG_SESSION(session, "iSCSI CmdSN closed. ExpCmdSn " |
1425 | "%u MaxCmdSN %u CmdSN %u/%u\n", | |
1426 | session->exp_cmdsn, session->max_cmdsn, | |
1427 | session->cmdsn, session->queued_cmdsn); | |
77a23c21 MC |
1428 | return -ENOSPC; |
1429 | } | |
1430 | return 0; | |
1431 | } | |
1432 | ||
5923d64b MC |
1433 | static int iscsi_xmit_task(struct iscsi_conn *conn, struct iscsi_task *task, |
1434 | bool was_requeue) | |
77a23c21 | 1435 | { |
843c0a8a | 1436 | int rc; |
77a23c21 | 1437 | |
79edd00d | 1438 | spin_lock_bh(&conn->session->back_lock); |
5923d64b MC |
1439 | |
1440 | if (!conn->task) { | |
1441 | /* Take a ref so we can access it after xmit_task() */ | |
1442 | __iscsi_get_task(task); | |
1443 | } else { | |
1444 | /* Already have a ref from when we failed to send it last call */ | |
1445 | conn->task = NULL; | |
1446 | } | |
1447 | ||
1448 | /* | |
1449 | * If this was a requeue for a R2T we have an extra ref on the task in | |
1450 | * case a bad target sends a cmd rsp before we have handled the task. | |
1451 | */ | |
1452 | if (was_requeue) | |
1453 | __iscsi_put_task(task); | |
1454 | ||
1455 | /* | |
1456 | * Do this after dropping the extra ref because if this was a requeue | |
1457 | * it's removed from that list and cleanup_queued_task would miss it. | |
1458 | */ | |
1459 | if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) { | |
1460 | /* | |
1461 | * Save the task and ref in case we weren't cleaning up this | |
1462 | * task and get woken up again. | |
1463 | */ | |
1464 | conn->task = task; | |
79edd00d AS |
1465 | spin_unlock_bh(&conn->session->back_lock); |
1466 | return -ENODATA; | |
1467 | } | |
79edd00d | 1468 | spin_unlock_bh(&conn->session->back_lock); |
5923d64b | 1469 | |
659743b0 | 1470 | spin_unlock_bh(&conn->session->frwd_lock); |
9c19a7d0 | 1471 | rc = conn->session->tt->xmit_task(task); |
659743b0 | 1472 | spin_lock_bh(&conn->session->frwd_lock); |
d355e57d | 1473 | if (!rc) { |
9c19a7d0 | 1474 | /* done with this task */ |
d355e57d | 1475 | task->last_xfer = jiffies; |
d355e57d | 1476 | } |
659743b0 | 1477 | /* regular RX path uses back_lock */ |
72b97402 | 1478 | spin_lock(&conn->session->back_lock); |
5923d64b MC |
1479 | if (rc && task->state == ISCSI_TASK_RUNNING) { |
1480 | /* | |
1481 | * get an extra ref that is released next time we access it | |
1482 | * as conn->task above. | |
1483 | */ | |
1484 | __iscsi_get_task(task); | |
1485 | conn->task = task; | |
1486 | } | |
1487 | ||
d355e57d | 1488 | __iscsi_put_task(task); |
72b97402 | 1489 | spin_unlock(&conn->session->back_lock); |
77a23c21 MC |
1490 | return rc; |
1491 | } | |
1492 | ||
843c0a8a | 1493 | /** |
9c19a7d0 MC |
1494 | * iscsi_requeue_task - requeue task to run from session workqueue |
1495 | * @task: task to requeue | |
843c0a8a | 1496 | * |
5923d64b | 1497 | * Callers must have taken a ref to the task that is going to be requeued. |
843c0a8a | 1498 | */ |
9c19a7d0 | 1499 | void iscsi_requeue_task(struct iscsi_task *task) |
843c0a8a | 1500 | { |
9c19a7d0 | 1501 | struct iscsi_conn *conn = task->conn; |
843c0a8a | 1502 | |
3bbaaad9 MC |
1503 | /* |
1504 | * this may be on the requeue list already if the xmit_task callout | |
1505 | * is handling the r2ts while we are adding new ones | |
1506 | */ | |
5923d64b MC |
1507 | spin_lock_bh(&conn->session->frwd_lock); |
1508 | if (list_empty(&task->running)) { | |
3bbaaad9 | 1509 | list_add_tail(&task->running, &conn->requeue); |
5923d64b MC |
1510 | } else { |
1511 | /* | |
1512 | * Don't need the extra ref since it's already requeued and | |
1513 | * has a ref. | |
1514 | */ | |
1515 | iscsi_put_task(task); | |
1516 | } | |
32ae763e | 1517 | iscsi_conn_queue_work(conn); |
5923d64b | 1518 | spin_unlock_bh(&conn->session->frwd_lock); |
843c0a8a | 1519 | } |
9c19a7d0 | 1520 | EXPORT_SYMBOL_GPL(iscsi_requeue_task); |
843c0a8a | 1521 | |
7996a778 MC |
1522 | /** |
1523 | * iscsi_data_xmit - xmit any command into the scheduled connection | |
1524 | * @conn: iscsi connection | |
1525 | * | |
1526 | * Notes: | |
1527 | * The function can return -EAGAIN in which case the caller must | |
1528 | * re-schedule it again later or recover. '0' return code means | |
1529 | * successful xmit. | |
1530 | **/ | |
1531 | static int iscsi_data_xmit(struct iscsi_conn *conn) | |
1532 | { | |
5d12c05e | 1533 | struct iscsi_task *task; |
3219e529 | 1534 | int rc = 0; |
7996a778 | 1535 | |
659743b0 | 1536 | spin_lock_bh(&conn->session->frwd_lock); |
70b31c15 | 1537 | if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) { |
1b2c7af8 | 1538 | ISCSI_DBG_SESSION(conn->session, "Tx suspended!\n"); |
659743b0 | 1539 | spin_unlock_bh(&conn->session->frwd_lock); |
3219e529 | 1540 | return -ENODATA; |
7996a778 | 1541 | } |
7996a778 | 1542 | |
9c19a7d0 | 1543 | if (conn->task) { |
5923d64b | 1544 | rc = iscsi_xmit_task(conn, conn->task, false); |
3219e529 | 1545 | if (rc) |
70b31c15 | 1546 | goto done; |
7996a778 MC |
1547 | } |
1548 | ||
77a23c21 MC |
1549 | /* |
1550 | * process mgmt pdus like nops before commands since we should | |
1551 | * only have one nop-out as a ping from us and targets should not | |
1552 | * overflow us with nop-ins | |
1553 | */ | |
1554 | check_mgmt: | |
843c0a8a | 1555 | while (!list_empty(&conn->mgmtqueue)) { |
5923d64b MC |
1556 | task = list_entry(conn->mgmtqueue.next, struct iscsi_task, |
1557 | running); | |
1558 | list_del_init(&task->running); | |
1559 | if (iscsi_prep_mgmt_task(conn, task)) { | |
659743b0 SP |
1560 | /* regular RX path uses back_lock */ |
1561 | spin_lock_bh(&conn->session->back_lock); | |
5923d64b | 1562 | __iscsi_put_task(task); |
659743b0 | 1563 | spin_unlock_bh(&conn->session->back_lock); |
b3a7ea8d MC |
1564 | continue; |
1565 | } | |
5923d64b | 1566 | rc = iscsi_xmit_task(conn, task, false); |
77a23c21 | 1567 | if (rc) |
70b31c15 | 1568 | goto done; |
7996a778 MC |
1569 | } |
1570 | ||
843c0a8a | 1571 | /* process pending command queue */ |
3bbaaad9 | 1572 | while (!list_empty(&conn->cmdqueue)) { |
5923d64b MC |
1573 | task = list_entry(conn->cmdqueue.next, struct iscsi_task, |
1574 | running); | |
1575 | list_del_init(&task->running); | |
b3a7ea8d | 1576 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) { |
5923d64b | 1577 | fail_scsi_task(task, DID_IMM_RETRY); |
b3a7ea8d MC |
1578 | continue; |
1579 | } | |
5923d64b | 1580 | rc = iscsi_prep_scsi_cmd_pdu(task); |
577577da | 1581 | if (rc) { |
d28d48c6 | 1582 | if (rc == -ENOMEM || rc == -EACCES) |
5923d64b | 1583 | fail_scsi_task(task, DID_IMM_RETRY); |
d28d48c6 | 1584 | else |
5923d64b | 1585 | fail_scsi_task(task, DID_ABORT); |
004d6530 BH |
1586 | continue; |
1587 | } | |
5923d64b | 1588 | rc = iscsi_xmit_task(conn, task, false); |
77a23c21 | 1589 | if (rc) |
70b31c15 | 1590 | goto done; |
77a23c21 | 1591 | /* |
9c19a7d0 | 1592 | * we could continuously get new task requests so |
77a23c21 MC |
1593 | * we need to check the mgmt queue for nops that need to |
1594 | * be sent to aviod starvation | |
1595 | */ | |
843c0a8a MC |
1596 | if (!list_empty(&conn->mgmtqueue)) |
1597 | goto check_mgmt; | |
1598 | } | |
1599 | ||
1600 | while (!list_empty(&conn->requeue)) { | |
b3a7ea8d MC |
1601 | /* |
1602 | * we always do fastlogout - conn stop code will clean up. | |
1603 | */ | |
1604 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) | |
1605 | break; | |
1606 | ||
5d12c05e MC |
1607 | task = list_entry(conn->requeue.next, struct iscsi_task, |
1608 | running); | |
5923d64b | 1609 | |
5d12c05e MC |
1610 | if (iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_DATA_OUT)) |
1611 | break; | |
1612 | ||
5923d64b MC |
1613 | list_del_init(&task->running); |
1614 | rc = iscsi_xmit_task(conn, task, true); | |
843c0a8a | 1615 | if (rc) |
70b31c15 | 1616 | goto done; |
843c0a8a | 1617 | if (!list_empty(&conn->mgmtqueue)) |
77a23c21 | 1618 | goto check_mgmt; |
7996a778 | 1619 | } |
659743b0 | 1620 | spin_unlock_bh(&conn->session->frwd_lock); |
3219e529 | 1621 | return -ENODATA; |
7996a778 | 1622 | |
70b31c15 | 1623 | done: |
659743b0 | 1624 | spin_unlock_bh(&conn->session->frwd_lock); |
3219e529 | 1625 | return rc; |
7996a778 MC |
1626 | } |
1627 | ||
c4028958 | 1628 | static void iscsi_xmitworker(struct work_struct *work) |
7996a778 | 1629 | { |
c4028958 DH |
1630 | struct iscsi_conn *conn = |
1631 | container_of(work, struct iscsi_conn, xmitwork); | |
3219e529 | 1632 | int rc; |
7996a778 MC |
1633 | /* |
1634 | * serialize Xmit worker on a per-connection basis. | |
1635 | */ | |
3219e529 MC |
1636 | do { |
1637 | rc = iscsi_data_xmit(conn); | |
1638 | } while (rc >= 0 || rc == -EAGAIN); | |
7996a778 MC |
1639 | } |
1640 | ||
577577da MC |
1641 | static inline struct iscsi_task *iscsi_alloc_task(struct iscsi_conn *conn, |
1642 | struct scsi_cmnd *sc) | |
1643 | { | |
1644 | struct iscsi_task *task; | |
1645 | ||
7acd72eb | 1646 | if (!kfifo_out(&conn->session->cmdpool.queue, |
577577da MC |
1647 | (void *) &task, sizeof(void *))) |
1648 | return NULL; | |
1649 | ||
1650 | sc->SCp.phase = conn->session->age; | |
1651 | sc->SCp.ptr = (char *) task; | |
1652 | ||
6dc618cd | 1653 | refcount_set(&task->refcount, 1); |
577577da MC |
1654 | task->state = ISCSI_TASK_PENDING; |
1655 | task->conn = conn; | |
1656 | task->sc = sc; | |
d355e57d MC |
1657 | task->have_checked_conn = false; |
1658 | task->last_timeout = jiffies; | |
1659 | task->last_xfer = jiffies; | |
55e51eda | 1660 | task->protected = false; |
577577da MC |
1661 | INIT_LIST_HEAD(&task->running); |
1662 | return task; | |
1663 | } | |
1664 | ||
7996a778 MC |
1665 | enum { |
1666 | FAILURE_BAD_HOST = 1, | |
1667 | FAILURE_SESSION_FAILED, | |
1668 | FAILURE_SESSION_FREED, | |
1669 | FAILURE_WINDOW_CLOSED, | |
60ecebf5 | 1670 | FAILURE_OOM, |
7996a778 | 1671 | FAILURE_SESSION_TERMINATE, |
656cffc9 | 1672 | FAILURE_SESSION_IN_RECOVERY, |
7996a778 | 1673 | FAILURE_SESSION_RECOVERY_TIMEOUT, |
b3a7ea8d | 1674 | FAILURE_SESSION_LOGGING_OUT, |
6eabafbe | 1675 | FAILURE_SESSION_NOT_READY, |
7996a778 MC |
1676 | }; |
1677 | ||
f41d4721 | 1678 | int iscsi_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc) |
7996a778 | 1679 | { |
75613521 | 1680 | struct iscsi_cls_session *cls_session; |
1336aed1 | 1681 | struct iscsi_host *ihost; |
7996a778 MC |
1682 | int reason = 0; |
1683 | struct iscsi_session *session; | |
1684 | struct iscsi_conn *conn; | |
9c19a7d0 | 1685 | struct iscsi_task *task = NULL; |
7996a778 | 1686 | |
7996a778 | 1687 | sc->result = 0; |
f47f2cf5 | 1688 | sc->SCp.ptr = NULL; |
7996a778 | 1689 | |
1336aed1 | 1690 | ihost = shost_priv(host); |
7996a778 | 1691 | |
75613521 MC |
1692 | cls_session = starget_to_session(scsi_target(sc->device)); |
1693 | session = cls_session->dd_data; | |
659743b0 | 1694 | spin_lock_bh(&session->frwd_lock); |
7996a778 | 1695 | |
75613521 | 1696 | reason = iscsi_session_chkready(cls_session); |
6eabafbe MC |
1697 | if (reason) { |
1698 | sc->result = reason; | |
1699 | goto fault; | |
1700 | } | |
1701 | ||
301e0f7e | 1702 | if (session->state != ISCSI_STATE_LOGGED_IN) { |
656cffc9 MC |
1703 | /* |
1704 | * to handle the race between when we set the recovery state | |
1705 | * and block the session we requeue here (commands could | |
1706 | * be entering our queuecommand while a block is starting | |
1707 | * up because the block code is not locked) | |
1708 | */ | |
9000bcd6 | 1709 | switch (session->state) { |
301e0f7e | 1710 | case ISCSI_STATE_FAILED: |
d7549412 RDT |
1711 | /* |
1712 | * cmds should fail during shutdown, if the session | |
1713 | * state is bad, allowing completion to happen | |
1714 | */ | |
1715 | if (unlikely(system_state != SYSTEM_RUNNING)) { | |
1716 | reason = FAILURE_SESSION_FAILED; | |
1717 | sc->result = DID_NO_CONNECT << 16; | |
1718 | break; | |
1719 | } | |
df561f66 | 1720 | fallthrough; |
9000bcd6 | 1721 | case ISCSI_STATE_IN_RECOVERY: |
656cffc9 | 1722 | reason = FAILURE_SESSION_IN_RECOVERY; |
301e0f7e MC |
1723 | sc->result = DID_IMM_RETRY << 16; |
1724 | break; | |
9000bcd6 MC |
1725 | case ISCSI_STATE_LOGGING_OUT: |
1726 | reason = FAILURE_SESSION_LOGGING_OUT; | |
301e0f7e MC |
1727 | sc->result = DID_IMM_RETRY << 16; |
1728 | break; | |
b3a7ea8d | 1729 | case ISCSI_STATE_RECOVERY_FAILED: |
656cffc9 | 1730 | reason = FAILURE_SESSION_RECOVERY_TIMEOUT; |
56d7fcfa | 1731 | sc->result = DID_TRANSPORT_FAILFAST << 16; |
b3a7ea8d MC |
1732 | break; |
1733 | case ISCSI_STATE_TERMINATE: | |
656cffc9 | 1734 | reason = FAILURE_SESSION_TERMINATE; |
6eabafbe | 1735 | sc->result = DID_NO_CONNECT << 16; |
b3a7ea8d | 1736 | break; |
b3a7ea8d | 1737 | default: |
656cffc9 | 1738 | reason = FAILURE_SESSION_FREED; |
6eabafbe | 1739 | sc->result = DID_NO_CONNECT << 16; |
b3a7ea8d | 1740 | } |
7996a778 MC |
1741 | goto fault; |
1742 | } | |
1743 | ||
7996a778 | 1744 | conn = session->leadconn; |
98644047 MC |
1745 | if (!conn) { |
1746 | reason = FAILURE_SESSION_FREED; | |
6eabafbe | 1747 | sc->result = DID_NO_CONNECT << 16; |
98644047 MC |
1748 | goto fault; |
1749 | } | |
7996a778 | 1750 | |
661134ad MC |
1751 | if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) { |
1752 | reason = FAILURE_SESSION_IN_RECOVERY; | |
eef9ffdf | 1753 | sc->result = DID_REQUEUE << 16; |
661134ad MC |
1754 | goto fault; |
1755 | } | |
1756 | ||
77a23c21 MC |
1757 | if (iscsi_check_cmdsn_window_closed(conn)) { |
1758 | reason = FAILURE_WINDOW_CLOSED; | |
1759 | goto reject; | |
1760 | } | |
1761 | ||
577577da MC |
1762 | task = iscsi_alloc_task(conn, sc); |
1763 | if (!task) { | |
60ecebf5 MC |
1764 | reason = FAILURE_OOM; |
1765 | goto reject; | |
1766 | } | |
7996a778 | 1767 | |
1336aed1 | 1768 | if (!ihost->workq) { |
577577da MC |
1769 | reason = iscsi_prep_scsi_cmd_pdu(task); |
1770 | if (reason) { | |
5d12c05e | 1771 | if (reason == -ENOMEM || reason == -EACCES) { |
577577da MC |
1772 | reason = FAILURE_OOM; |
1773 | goto prepd_reject; | |
1774 | } else { | |
1775 | sc->result = DID_ABORT << 16; | |
1776 | goto prepd_fault; | |
1777 | } | |
052d0144 | 1778 | } |
9c19a7d0 | 1779 | if (session->tt->xmit_task(task)) { |
d3305f34 | 1780 | session->cmdsn--; |
052d0144 | 1781 | reason = FAILURE_SESSION_NOT_READY; |
577577da | 1782 | goto prepd_reject; |
052d0144 | 1783 | } |
3bbaaad9 MC |
1784 | } else { |
1785 | list_add_tail(&task->running, &conn->cmdqueue); | |
32ae763e | 1786 | iscsi_conn_queue_work(conn); |
3bbaaad9 | 1787 | } |
052d0144 MC |
1788 | |
1789 | session->queued_cmdsn++; | |
659743b0 | 1790 | spin_unlock_bh(&session->frwd_lock); |
7996a778 MC |
1791 | return 0; |
1792 | ||
577577da | 1793 | prepd_reject: |
a656183e | 1794 | spin_lock_bh(&session->back_lock); |
f41d4721 | 1795 | iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ); |
a656183e | 1796 | spin_unlock_bh(&session->back_lock); |
7996a778 | 1797 | reject: |
659743b0 | 1798 | spin_unlock_bh(&session->frwd_lock); |
1b2c7af8 MC |
1799 | ISCSI_DBG_SESSION(session, "cmd 0x%x rejected (%d)\n", |
1800 | sc->cmnd[0], reason); | |
d6d13ee1 | 1801 | return SCSI_MLQUEUE_TARGET_BUSY; |
7996a778 | 1802 | |
577577da | 1803 | prepd_fault: |
a656183e | 1804 | spin_lock_bh(&session->back_lock); |
f41d4721 | 1805 | iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ); |
a656183e | 1806 | spin_unlock_bh(&session->back_lock); |
7996a778 | 1807 | fault: |
659743b0 | 1808 | spin_unlock_bh(&session->frwd_lock); |
1b2c7af8 MC |
1809 | ISCSI_DBG_SESSION(session, "iscsi: cmd 0x%x is not queued (%d)\n", |
1810 | sc->cmnd[0], reason); | |
ae3d56d8 | 1811 | scsi_set_resid(sc, scsi_bufflen(sc)); |
f41d4721 | 1812 | sc->scsi_done(sc); |
7996a778 MC |
1813 | return 0; |
1814 | } | |
1815 | EXPORT_SYMBOL_GPL(iscsi_queuecommand); | |
1816 | ||
6b5d6c44 MC |
1817 | int iscsi_target_alloc(struct scsi_target *starget) |
1818 | { | |
1819 | struct iscsi_cls_session *cls_session = starget_to_session(starget); | |
1820 | struct iscsi_session *session = cls_session->dd_data; | |
1821 | ||
1822 | starget->can_queue = session->scsi_cmds_max; | |
1823 | return 0; | |
1824 | } | |
1825 | EXPORT_SYMBOL_GPL(iscsi_target_alloc); | |
1826 | ||
2c4b9637 | 1827 | static void iscsi_tmf_timedout(struct timer_list *t) |
7996a778 | 1828 | { |
2c4b9637 | 1829 | struct iscsi_conn *conn = from_timer(conn, t, tmf_timer); |
7996a778 MC |
1830 | struct iscsi_session *session = conn->session; |
1831 | ||
659743b0 | 1832 | spin_lock(&session->frwd_lock); |
843c0a8a MC |
1833 | if (conn->tmf_state == TMF_QUEUED) { |
1834 | conn->tmf_state = TMF_TIMEDOUT; | |
bd2199d4 | 1835 | ISCSI_DBG_EH(session, "tmf timedout\n"); |
7996a778 MC |
1836 | /* unblock eh_abort() */ |
1837 | wake_up(&conn->ehwait); | |
1838 | } | |
659743b0 | 1839 | spin_unlock(&session->frwd_lock); |
7996a778 MC |
1840 | } |
1841 | ||
9c19a7d0 | 1842 | static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn, |
f6d5180c MC |
1843 | struct iscsi_tm *hdr, int age, |
1844 | int timeout) | |
1360c58a | 1845 | __must_hold(&session->frwd_lock) |
7996a778 | 1846 | { |
7996a778 | 1847 | struct iscsi_session *session = conn->session; |
9c19a7d0 | 1848 | struct iscsi_task *task; |
7996a778 | 1849 | |
9c19a7d0 | 1850 | task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr, |
843c0a8a | 1851 | NULL, 0); |
9c19a7d0 | 1852 | if (!task) { |
659743b0 | 1853 | spin_unlock_bh(&session->frwd_lock); |
df4da5cd | 1854 | iscsi_conn_printk(KERN_ERR, conn, "Could not send TMF.\n"); |
7996a778 | 1855 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
659743b0 | 1856 | spin_lock_bh(&session->frwd_lock); |
77a23c21 | 1857 | return -EPERM; |
7996a778 | 1858 | } |
843c0a8a | 1859 | conn->tmfcmd_pdus_cnt++; |
f6d5180c | 1860 | conn->tmf_timer.expires = timeout * HZ + jiffies; |
843c0a8a | 1861 | add_timer(&conn->tmf_timer); |
bd2199d4 | 1862 | ISCSI_DBG_EH(session, "tmf set timeout\n"); |
7996a778 | 1863 | |
659743b0 | 1864 | spin_unlock_bh(&session->frwd_lock); |
6724add1 | 1865 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1866 | |
1867 | /* | |
1868 | * block eh thread until: | |
1869 | * | |
843c0a8a MC |
1870 | * 1) tmf response |
1871 | * 2) tmf timeout | |
7996a778 MC |
1872 | * 3) session is terminated or restarted or userspace has |
1873 | * given up on recovery | |
1874 | */ | |
843c0a8a | 1875 | wait_event_interruptible(conn->ehwait, age != session->age || |
7996a778 | 1876 | session->state != ISCSI_STATE_LOGGED_IN || |
843c0a8a | 1877 | conn->tmf_state != TMF_QUEUED); |
7996a778 MC |
1878 | if (signal_pending(current)) |
1879 | flush_signals(current); | |
843c0a8a MC |
1880 | del_timer_sync(&conn->tmf_timer); |
1881 | ||
6724add1 | 1882 | mutex_lock(&session->eh_mutex); |
659743b0 | 1883 | spin_lock_bh(&session->frwd_lock); |
9c19a7d0 | 1884 | /* if the session drops it will clean up the task */ |
843c0a8a MC |
1885 | if (age != session->age || |
1886 | session->state != ISCSI_STATE_LOGGED_IN) | |
1887 | return -ENOTCONN; | |
7996a778 MC |
1888 | return 0; |
1889 | } | |
1890 | ||
843c0a8a | 1891 | /* |
14936b1e | 1892 | * Fail commands. session frwd lock held and xmit thread flushed. |
843c0a8a | 1893 | */ |
9cb78c16 | 1894 | static void fail_scsi_tasks(struct iscsi_conn *conn, u64 lun, int error) |
843c0a8a | 1895 | { |
14936b1e | 1896 | struct iscsi_session *session = conn->session; |
3bbaaad9 MC |
1897 | struct iscsi_task *task; |
1898 | int i; | |
843c0a8a | 1899 | |
14936b1e MC |
1900 | spin_lock_bh(&session->back_lock); |
1901 | for (i = 0; i < session->cmds_max; i++) { | |
1902 | task = session->cmds[i]; | |
3bbaaad9 MC |
1903 | if (!task->sc || task->state == ISCSI_TASK_FREE) |
1904 | continue; | |
843c0a8a | 1905 | |
3bbaaad9 MC |
1906 | if (lun != -1 && lun != task->sc->device->lun) |
1907 | continue; | |
843c0a8a | 1908 | |
14936b1e MC |
1909 | __iscsi_get_task(task); |
1910 | spin_unlock_bh(&session->back_lock); | |
1911 | ||
1912 | ISCSI_DBG_SESSION(session, | |
3bbaaad9 MC |
1913 | "failing sc %p itt 0x%x state %d\n", |
1914 | task->sc, task->itt, task->state); | |
b3cd5050 | 1915 | fail_scsi_task(task, error); |
14936b1e MC |
1916 | |
1917 | spin_unlock_bh(&session->frwd_lock); | |
1918 | iscsi_put_task(task); | |
1919 | spin_lock_bh(&session->frwd_lock); | |
1920 | ||
1921 | spin_lock_bh(&session->back_lock); | |
843c0a8a | 1922 | } |
14936b1e MC |
1923 | |
1924 | spin_unlock_bh(&session->back_lock); | |
843c0a8a MC |
1925 | } |
1926 | ||
661134ad MC |
1927 | /** |
1928 | * iscsi_suspend_queue - suspend iscsi_queuecommand | |
1929 | * @conn: iscsi conn to stop queueing IO on | |
1930 | * | |
659743b0 | 1931 | * This grabs the session frwd_lock to make sure no one is in |
661134ad MC |
1932 | * xmit_task/queuecommand, and then sets suspend to prevent |
1933 | * new commands from being queued. This only needs to be called | |
1934 | * by offload drivers that need to sync a path like ep disconnect | |
1935 | * with the iscsi_queuecommand/xmit_task. To start IO again libiscsi | |
1936 | * will call iscsi_start_tx and iscsi_unblock_session when in FFP. | |
1937 | */ | |
1938 | void iscsi_suspend_queue(struct iscsi_conn *conn) | |
1939 | { | |
659743b0 | 1940 | spin_lock_bh(&conn->session->frwd_lock); |
661134ad | 1941 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); |
659743b0 | 1942 | spin_unlock_bh(&conn->session->frwd_lock); |
661134ad MC |
1943 | } |
1944 | EXPORT_SYMBOL_GPL(iscsi_suspend_queue); | |
1945 | ||
1946 | /** | |
1947 | * iscsi_suspend_tx - suspend iscsi_data_xmit | |
1948 | * @conn: iscsi conn tp stop processing IO on. | |
1949 | * | |
1950 | * This function sets the suspend bit to prevent iscsi_data_xmit | |
1951 | * from sending new IO, and if work is queued on the xmit thread | |
1952 | * it will wait for it to be completed. | |
1953 | */ | |
b40977d9 | 1954 | void iscsi_suspend_tx(struct iscsi_conn *conn) |
6724add1 | 1955 | { |
32ae763e MC |
1956 | struct Scsi_Host *shost = conn->session->host; |
1957 | struct iscsi_host *ihost = shost_priv(shost); | |
1958 | ||
6724add1 | 1959 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); |
1336aed1 | 1960 | if (ihost->workq) |
32ae763e | 1961 | flush_workqueue(ihost->workq); |
6724add1 | 1962 | } |
b40977d9 | 1963 | EXPORT_SYMBOL_GPL(iscsi_suspend_tx); |
6724add1 MC |
1964 | |
1965 | static void iscsi_start_tx(struct iscsi_conn *conn) | |
1966 | { | |
1967 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
1336aed1 | 1968 | iscsi_conn_queue_work(conn); |
6724add1 MC |
1969 | } |
1970 | ||
4c48a829 MC |
1971 | /* |
1972 | * We want to make sure a ping is in flight. It has timed out. | |
1973 | * And we are not busy processing a pdu that is making | |
1974 | * progress but got started before the ping and is taking a while | |
1975 | * to complete so the ping is just stuck behind it in a queue. | |
1976 | */ | |
1977 | static int iscsi_has_ping_timed_out(struct iscsi_conn *conn) | |
1978 | { | |
fe0a8a95 | 1979 | if (READ_ONCE(conn->ping_task) && |
4c48a829 MC |
1980 | time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) + |
1981 | (conn->ping_timeout * HZ), jiffies)) | |
1982 | return 1; | |
1983 | else | |
1984 | return 0; | |
1985 | } | |
1986 | ||
b6a05c82 | 1987 | enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *sc) |
f6d5180c | 1988 | { |
6600593c | 1989 | enum blk_eh_timer_return rc = BLK_EH_DONE; |
92ed4d69 | 1990 | struct iscsi_task *task = NULL, *running_task; |
f6d5180c MC |
1991 | struct iscsi_cls_session *cls_session; |
1992 | struct iscsi_session *session; | |
1993 | struct iscsi_conn *conn; | |
92ed4d69 | 1994 | int i; |
f6d5180c | 1995 | |
d355e57d | 1996 | cls_session = starget_to_session(scsi_target(sc->device)); |
75613521 | 1997 | session = cls_session->dd_data; |
f6d5180c | 1998 | |
bd2199d4 | 1999 | ISCSI_DBG_EH(session, "scsi cmd %p timedout\n", sc); |
f6d5180c | 2000 | |
5480e299 | 2001 | spin_lock_bh(&session->frwd_lock); |
14936b1e | 2002 | spin_lock(&session->back_lock); |
e3d338a5 MC |
2003 | task = (struct iscsi_task *)sc->SCp.ptr; |
2004 | if (!task) { | |
2005 | /* | |
2006 | * Raced with completion. Blk layer has taken ownership | |
2007 | * so let timeout code complete it now. | |
2008 | */ | |
adb2b769 | 2009 | rc = BLK_EH_DONE; |
14936b1e | 2010 | spin_unlock(&session->back_lock); |
e3d338a5 MC |
2011 | goto done; |
2012 | } | |
14936b1e MC |
2013 | __iscsi_get_task(task); |
2014 | spin_unlock(&session->back_lock); | |
e3d338a5 | 2015 | |
f6d5180c | 2016 | if (session->state != ISCSI_STATE_LOGGED_IN) { |
d7549412 RDT |
2017 | /* |
2018 | * During shutdown, if session is prematurely disconnected, | |
2019 | * recovery won't happen and there will be hung cmds. Not | |
2020 | * handling cmds would trigger EH, also bad in this case. | |
2021 | * Instead, handle cmd, allow completion to happen and let | |
2022 | * upper layer to deal with the result. | |
2023 | */ | |
2024 | if (unlikely(system_state != SYSTEM_RUNNING)) { | |
2025 | sc->result = DID_NO_CONNECT << 16; | |
2026 | ISCSI_DBG_EH(session, "sc on shutdown, handled\n"); | |
adb2b769 | 2027 | rc = BLK_EH_DONE; |
d7549412 RDT |
2028 | goto done; |
2029 | } | |
f6d5180c MC |
2030 | /* |
2031 | * We are probably in the middle of iscsi recovery so let | |
2032 | * that complete and handle the error. | |
2033 | */ | |
242f9dcb | 2034 | rc = BLK_EH_RESET_TIMER; |
f6d5180c MC |
2035 | goto done; |
2036 | } | |
2037 | ||
2038 | conn = session->leadconn; | |
2039 | if (!conn) { | |
2040 | /* In the middle of shuting down */ | |
242f9dcb | 2041 | rc = BLK_EH_RESET_TIMER; |
f6d5180c MC |
2042 | goto done; |
2043 | } | |
2044 | ||
d355e57d MC |
2045 | /* |
2046 | * If we have sent (at least queued to the network layer) a pdu or | |
2047 | * recvd one for the task since the last timeout ask for | |
2048 | * more time. If on the next timeout we have not made progress | |
2049 | * we can check if it is the task or connection when we send the | |
2050 | * nop as a ping. | |
2051 | */ | |
92ed4d69 | 2052 | if (time_after(task->last_xfer, task->last_timeout)) { |
bd2199d4 EZ |
2053 | ISCSI_DBG_EH(session, "Command making progress. Asking " |
2054 | "scsi-ml for more time to complete. " | |
92ed4d69 | 2055 | "Last data xfer at %lu. Last timeout was at " |
bd2199d4 | 2056 | "%lu\n.", task->last_xfer, task->last_timeout); |
d355e57d MC |
2057 | task->have_checked_conn = false; |
2058 | rc = BLK_EH_RESET_TIMER; | |
2059 | goto done; | |
2060 | } | |
2061 | ||
f6d5180c MC |
2062 | if (!conn->recv_timeout && !conn->ping_timeout) |
2063 | goto done; | |
2064 | /* | |
2065 | * if the ping timedout then we are in the middle of cleaning up | |
2066 | * and can let the iscsi eh handle it | |
2067 | */ | |
4c48a829 | 2068 | if (iscsi_has_ping_timed_out(conn)) { |
242f9dcb | 2069 | rc = BLK_EH_RESET_TIMER; |
4c48a829 MC |
2070 | goto done; |
2071 | } | |
d355e57d | 2072 | |
14936b1e | 2073 | spin_lock(&session->back_lock); |
92ed4d69 MC |
2074 | for (i = 0; i < conn->session->cmds_max; i++) { |
2075 | running_task = conn->session->cmds[i]; | |
2076 | if (!running_task->sc || running_task == task || | |
2077 | running_task->state != ISCSI_TASK_RUNNING) | |
2078 | continue; | |
2079 | ||
2080 | /* | |
2081 | * Only check if cmds started before this one have made | |
2082 | * progress, or this could never fail | |
2083 | */ | |
2084 | if (time_after(running_task->sc->jiffies_at_alloc, | |
2085 | task->sc->jiffies_at_alloc)) | |
2086 | continue; | |
2087 | ||
2088 | if (time_after(running_task->last_xfer, task->last_timeout)) { | |
2089 | /* | |
2090 | * This task has not made progress, but a task | |
2091 | * started before us has transferred data since | |
2092 | * we started/last-checked. We could be queueing | |
2093 | * too many tasks or the LU is bad. | |
2094 | * | |
2095 | * If the device is bad the cmds ahead of us on | |
2096 | * other devs will complete, and this loop will | |
2097 | * eventually fail starting the scsi eh. | |
2098 | */ | |
2099 | ISCSI_DBG_EH(session, "Command has not made progress " | |
2100 | "but commands ahead of it have. " | |
2101 | "Asking scsi-ml for more time to " | |
2102 | "complete. Our last xfer vs running task " | |
2103 | "last xfer %lu/%lu. Last check %lu.\n", | |
2104 | task->last_xfer, running_task->last_xfer, | |
2105 | task->last_timeout); | |
14936b1e | 2106 | spin_unlock(&session->back_lock); |
92ed4d69 MC |
2107 | rc = BLK_EH_RESET_TIMER; |
2108 | goto done; | |
2109 | } | |
2110 | } | |
14936b1e | 2111 | spin_unlock(&session->back_lock); |
92ed4d69 | 2112 | |
d355e57d MC |
2113 | /* Assumes nop timeout is shorter than scsi cmd timeout */ |
2114 | if (task->have_checked_conn) | |
2115 | goto done; | |
2116 | ||
f6d5180c | 2117 | /* |
d355e57d MC |
2118 | * Checking the transport already or nop from a cmd timeout still |
2119 | * running | |
f6d5180c | 2120 | */ |
fe0a8a95 | 2121 | if (READ_ONCE(conn->ping_task)) { |
d355e57d | 2122 | task->have_checked_conn = true; |
242f9dcb | 2123 | rc = BLK_EH_RESET_TIMER; |
4c48a829 MC |
2124 | goto done; |
2125 | } | |
2126 | ||
d355e57d MC |
2127 | /* Make sure there is a transport check done */ |
2128 | iscsi_send_nopout(conn, NULL); | |
2129 | task->have_checked_conn = true; | |
2130 | rc = BLK_EH_RESET_TIMER; | |
2131 | ||
f6d5180c | 2132 | done: |
5480e299 | 2133 | spin_unlock_bh(&session->frwd_lock); |
14936b1e MC |
2134 | |
2135 | if (task) { | |
2136 | task->last_timeout = jiffies; | |
2137 | iscsi_put_task(task); | |
2138 | } | |
bd2199d4 | 2139 | ISCSI_DBG_EH(session, "return %s\n", rc == BLK_EH_RESET_TIMER ? |
d7549412 | 2140 | "timer reset" : "shutdown or nh"); |
f6d5180c MC |
2141 | return rc; |
2142 | } | |
b6a05c82 | 2143 | EXPORT_SYMBOL_GPL(iscsi_eh_cmd_timed_out); |
f6d5180c | 2144 | |
2c4b9637 | 2145 | static void iscsi_check_transport_timeouts(struct timer_list *t) |
f6d5180c | 2146 | { |
2c4b9637 | 2147 | struct iscsi_conn *conn = from_timer(conn, t, transport_timer); |
f6d5180c | 2148 | struct iscsi_session *session = conn->session; |
4cf10435 | 2149 | unsigned long recv_timeout, next_timeout = 0, last_recv; |
f6d5180c | 2150 | |
659743b0 | 2151 | spin_lock(&session->frwd_lock); |
f6d5180c MC |
2152 | if (session->state != ISCSI_STATE_LOGGED_IN) |
2153 | goto done; | |
2154 | ||
4cf10435 MC |
2155 | recv_timeout = conn->recv_timeout; |
2156 | if (!recv_timeout) | |
f6d5180c MC |
2157 | goto done; |
2158 | ||
4cf10435 | 2159 | recv_timeout *= HZ; |
f6d5180c | 2160 | last_recv = conn->last_recv; |
4c48a829 MC |
2161 | |
2162 | if (iscsi_has_ping_timed_out(conn)) { | |
322d739d | 2163 | iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs " |
4c48a829 MC |
2164 | "expired, recv timeout %d, last rx %lu, " |
2165 | "last ping %lu, now %lu\n", | |
2166 | conn->ping_timeout, conn->recv_timeout, | |
2167 | last_recv, conn->last_ping, jiffies); | |
659743b0 | 2168 | spin_unlock(&session->frwd_lock); |
09ff742c | 2169 | iscsi_conn_failure(conn, ISCSI_ERR_NOP_TIMEDOUT); |
f6d5180c MC |
2170 | return; |
2171 | } | |
2172 | ||
4cf10435 | 2173 | if (time_before_eq(last_recv + recv_timeout, jiffies)) { |
c8611f97 | 2174 | /* send a ping to try to provoke some traffic */ |
1b2c7af8 | 2175 | ISCSI_DBG_CONN(conn, "Sending nopout as ping\n"); |
52f5664a AN |
2176 | if (iscsi_send_nopout(conn, NULL)) |
2177 | next_timeout = jiffies + (1 * HZ); | |
2178 | else | |
2179 | next_timeout = conn->last_ping + (conn->ping_timeout * HZ); | |
ad294e9c | 2180 | } else |
4cf10435 | 2181 | next_timeout = last_recv + recv_timeout; |
f6d5180c | 2182 | |
1b2c7af8 | 2183 | ISCSI_DBG_CONN(conn, "Setting next tmo %lu\n", next_timeout); |
ad294e9c | 2184 | mod_timer(&conn->transport_timer, next_timeout); |
f6d5180c | 2185 | done: |
659743b0 | 2186 | spin_unlock(&session->frwd_lock); |
f6d5180c MC |
2187 | } |
2188 | ||
891e2639 MC |
2189 | /** |
2190 | * iscsi_conn_unbind - prevent queueing to conn. | |
2191 | * @cls_conn: iscsi conn ep is bound to. | |
2192 | * @is_active: is the conn in use for boot or is this for EH/termination | |
2193 | * | |
2194 | * This must be called by drivers implementing the ep_disconnect callout. | |
2195 | * It disables queueing to the connection from libiscsi in preparation for | |
2196 | * an ep_disconnect call. | |
2197 | */ | |
2198 | void iscsi_conn_unbind(struct iscsi_cls_conn *cls_conn, bool is_active) | |
2199 | { | |
2200 | struct iscsi_session *session; | |
2201 | struct iscsi_conn *conn; | |
2202 | ||
2203 | if (!cls_conn) | |
2204 | return; | |
2205 | ||
2206 | conn = cls_conn->dd_data; | |
2207 | session = conn->session; | |
2208 | /* | |
2209 | * Wait for iscsi_eh calls to exit. We don't wait for the tmf to | |
2210 | * complete or timeout. The caller just wants to know what's running | |
2211 | * is everything that needs to be cleaned up, and no cmds will be | |
2212 | * queued. | |
2213 | */ | |
2214 | mutex_lock(&session->eh_mutex); | |
2215 | ||
2216 | iscsi_suspend_queue(conn); | |
2217 | iscsi_suspend_tx(conn); | |
2218 | ||
2219 | spin_lock_bh(&session->frwd_lock); | |
2220 | if (!is_active) { | |
2221 | /* | |
2222 | * if logout timed out before userspace could even send a PDU | |
2223 | * the state might still be in ISCSI_STATE_LOGGED_IN and | |
2224 | * allowing new cmds and TMFs. | |
2225 | */ | |
2226 | if (session->state == ISCSI_STATE_LOGGED_IN) | |
2227 | iscsi_set_conn_failed(conn); | |
2228 | } | |
2229 | spin_unlock_bh(&session->frwd_lock); | |
2230 | mutex_unlock(&session->eh_mutex); | |
2231 | } | |
2232 | EXPORT_SYMBOL_GPL(iscsi_conn_unbind); | |
2233 | ||
9c19a7d0 | 2234 | static void iscsi_prep_abort_task_pdu(struct iscsi_task *task, |
843c0a8a MC |
2235 | struct iscsi_tm *hdr) |
2236 | { | |
2237 | memset(hdr, 0, sizeof(*hdr)); | |
2238 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
2239 | hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK; | |
2240 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
55bdabdf | 2241 | hdr->lun = task->lun; |
577577da MC |
2242 | hdr->rtt = task->hdr_itt; |
2243 | hdr->refcmdsn = task->cmdsn; | |
843c0a8a MC |
2244 | } |
2245 | ||
7996a778 MC |
2246 | int iscsi_eh_abort(struct scsi_cmnd *sc) |
2247 | { | |
75613521 MC |
2248 | struct iscsi_cls_session *cls_session; |
2249 | struct iscsi_session *session; | |
f47f2cf5 | 2250 | struct iscsi_conn *conn; |
9c19a7d0 | 2251 | struct iscsi_task *task; |
843c0a8a | 2252 | struct iscsi_tm *hdr; |
e9e410e8 | 2253 | int age; |
7996a778 | 2254 | |
75613521 MC |
2255 | cls_session = starget_to_session(scsi_target(sc->device)); |
2256 | session = cls_session->dd_data; | |
2257 | ||
bd2199d4 | 2258 | ISCSI_DBG_EH(session, "aborting sc %p\n", sc); |
4421c9eb | 2259 | |
6724add1 | 2260 | mutex_lock(&session->eh_mutex); |
659743b0 | 2261 | spin_lock_bh(&session->frwd_lock); |
f47f2cf5 MC |
2262 | /* |
2263 | * if session was ISCSI_STATE_IN_RECOVERY then we may not have | |
2264 | * got the command. | |
2265 | */ | |
2266 | if (!sc->SCp.ptr) { | |
bd2199d4 EZ |
2267 | ISCSI_DBG_EH(session, "sc never reached iscsi layer or " |
2268 | "it completed.\n"); | |
659743b0 | 2269 | spin_unlock_bh(&session->frwd_lock); |
6724add1 | 2270 | mutex_unlock(&session->eh_mutex); |
f47f2cf5 MC |
2271 | return SUCCESS; |
2272 | } | |
2273 | ||
7996a778 MC |
2274 | /* |
2275 | * If we are not logged in or we have started a new session | |
2276 | * then let the host reset code handle this | |
2277 | */ | |
843c0a8a MC |
2278 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN || |
2279 | sc->SCp.phase != session->age) { | |
659743b0 | 2280 | spin_unlock_bh(&session->frwd_lock); |
843c0a8a | 2281 | mutex_unlock(&session->eh_mutex); |
bd2199d4 | 2282 | ISCSI_DBG_EH(session, "failing abort due to dropped " |
4421c9eb | 2283 | "session.\n"); |
843c0a8a MC |
2284 | return FAILED; |
2285 | } | |
2286 | ||
2287 | conn = session->leadconn; | |
2288 | conn->eh_abort_cnt++; | |
2289 | age = session->age; | |
2290 | ||
14936b1e | 2291 | spin_lock(&session->back_lock); |
9c19a7d0 | 2292 | task = (struct iscsi_task *)sc->SCp.ptr; |
14936b1e MC |
2293 | if (!task || !task->sc) { |
2294 | /* task completed before time out */ | |
bd2199d4 | 2295 | ISCSI_DBG_EH(session, "sc completed while abort in progress\n"); |
14936b1e MC |
2296 | |
2297 | spin_unlock(&session->back_lock); | |
2298 | spin_unlock_bh(&session->frwd_lock); | |
2299 | mutex_unlock(&session->eh_mutex); | |
2300 | return SUCCESS; | |
7ea8b828 | 2301 | } |
14936b1e MC |
2302 | ISCSI_DBG_EH(session, "aborting [sc %p itt 0x%x]\n", sc, task->itt); |
2303 | __iscsi_get_task(task); | |
2304 | spin_unlock(&session->back_lock); | |
7996a778 | 2305 | |
9c19a7d0 | 2306 | if (task->state == ISCSI_TASK_PENDING) { |
b3cd5050 | 2307 | fail_scsi_task(task, DID_ABORT); |
77a23c21 MC |
2308 | goto success; |
2309 | } | |
7996a778 | 2310 | |
843c0a8a MC |
2311 | /* only have one tmf outstanding at a time */ |
2312 | if (conn->tmf_state != TMF_INITIAL) | |
7996a778 | 2313 | goto failed; |
843c0a8a | 2314 | conn->tmf_state = TMF_QUEUED; |
7996a778 | 2315 | |
843c0a8a | 2316 | hdr = &conn->tmhdr; |
9c19a7d0 | 2317 | iscsi_prep_abort_task_pdu(task, hdr); |
843c0a8a | 2318 | |
e9e410e8 | 2319 | if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout)) |
843c0a8a | 2320 | goto failed; |
843c0a8a MC |
2321 | |
2322 | switch (conn->tmf_state) { | |
2323 | case TMF_SUCCESS: | |
659743b0 | 2324 | spin_unlock_bh(&session->frwd_lock); |
913e5bf4 MC |
2325 | /* |
2326 | * stop tx side incase the target had sent a abort rsp but | |
2327 | * the initiator was still writing out data. | |
2328 | */ | |
6724add1 | 2329 | iscsi_suspend_tx(conn); |
77a23c21 | 2330 | /* |
913e5bf4 MC |
2331 | * we do not stop the recv side because targets have been |
2332 | * good and have never sent us a successful tmf response | |
2333 | * then sent more data for the cmd. | |
77a23c21 | 2334 | */ |
659743b0 | 2335 | spin_lock_bh(&session->frwd_lock); |
b3cd5050 | 2336 | fail_scsi_task(task, DID_ABORT); |
843c0a8a | 2337 | conn->tmf_state = TMF_INITIAL; |
5d12c05e | 2338 | memset(hdr, 0, sizeof(*hdr)); |
659743b0 | 2339 | spin_unlock_bh(&session->frwd_lock); |
6724add1 | 2340 | iscsi_start_tx(conn); |
77a23c21 | 2341 | goto success_unlocked; |
843c0a8a | 2342 | case TMF_TIMEDOUT: |
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: | |
2347 | if (!sc->SCp.ptr) { | |
2348 | conn->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: |
843c0a8a MC |
2357 | conn->tmf_state = TMF_INITIAL; |
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); |
6724add1 | 2367 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
2368 | return SUCCESS; |
2369 | ||
2370 | failed: | |
659743b0 | 2371 | spin_unlock_bh(&session->frwd_lock); |
77a23c21 | 2372 | failed_unlocked: |
bd2199d4 EZ |
2373 | ISCSI_DBG_EH(session, "abort failed [sc %p itt 0x%x]\n", sc, |
2374 | task ? task->itt : 0); | |
14936b1e | 2375 | iscsi_put_task(task); |
6724add1 | 2376 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
2377 | return FAILED; |
2378 | } | |
2379 | EXPORT_SYMBOL_GPL(iscsi_eh_abort); | |
2380 | ||
843c0a8a MC |
2381 | static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr) |
2382 | { | |
2383 | memset(hdr, 0, sizeof(*hdr)); | |
2384 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
2385 | hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK; | |
2386 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
55bdabdf | 2387 | int_to_scsilun(sc->device->lun, &hdr->lun); |
f6d5180c | 2388 | hdr->rtt = RESERVED_ITT; |
843c0a8a MC |
2389 | } |
2390 | ||
2391 | int iscsi_eh_device_reset(struct scsi_cmnd *sc) | |
2392 | { | |
75613521 MC |
2393 | struct iscsi_cls_session *cls_session; |
2394 | struct iscsi_session *session; | |
843c0a8a MC |
2395 | struct iscsi_conn *conn; |
2396 | struct iscsi_tm *hdr; | |
2397 | int rc = FAILED; | |
2398 | ||
75613521 MC |
2399 | cls_session = starget_to_session(scsi_target(sc->device)); |
2400 | session = cls_session->dd_data; | |
2401 | ||
9cb78c16 HR |
2402 | ISCSI_DBG_EH(session, "LU Reset [sc %p lun %llu]\n", sc, |
2403 | sc->device->lun); | |
843c0a8a MC |
2404 | |
2405 | mutex_lock(&session->eh_mutex); | |
659743b0 | 2406 | spin_lock_bh(&session->frwd_lock); |
843c0a8a MC |
2407 | /* |
2408 | * Just check if we are not logged in. We cannot check for | |
2409 | * the phase because the reset could come from a ioctl. | |
2410 | */ | |
2411 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN) | |
2412 | goto unlock; | |
2413 | conn = session->leadconn; | |
2414 | ||
2415 | /* only have one tmf outstanding at a time */ | |
2416 | if (conn->tmf_state != TMF_INITIAL) | |
2417 | goto unlock; | |
2418 | conn->tmf_state = TMF_QUEUED; | |
2419 | ||
2420 | hdr = &conn->tmhdr; | |
2421 | iscsi_prep_lun_reset_pdu(sc, hdr); | |
2422 | ||
9c19a7d0 | 2423 | if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age, |
f6d5180c | 2424 | session->lu_reset_timeout)) { |
843c0a8a MC |
2425 | rc = FAILED; |
2426 | goto unlock; | |
2427 | } | |
2428 | ||
2429 | switch (conn->tmf_state) { | |
2430 | case TMF_SUCCESS: | |
2431 | break; | |
2432 | case TMF_TIMEDOUT: | |
659743b0 | 2433 | spin_unlock_bh(&session->frwd_lock); |
df4da5cd | 2434 | iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); |
843c0a8a MC |
2435 | goto done; |
2436 | default: | |
2437 | conn->tmf_state = TMF_INITIAL; | |
2438 | goto unlock; | |
2439 | } | |
2440 | ||
2441 | rc = SUCCESS; | |
659743b0 | 2442 | spin_unlock_bh(&session->frwd_lock); |
843c0a8a MC |
2443 | |
2444 | iscsi_suspend_tx(conn); | |
913e5bf4 | 2445 | |
659743b0 | 2446 | spin_lock_bh(&session->frwd_lock); |
5d12c05e | 2447 | memset(hdr, 0, sizeof(*hdr)); |
3bbaaad9 | 2448 | fail_scsi_tasks(conn, sc->device->lun, DID_ERROR); |
843c0a8a | 2449 | conn->tmf_state = TMF_INITIAL; |
659743b0 | 2450 | spin_unlock_bh(&session->frwd_lock); |
843c0a8a MC |
2451 | |
2452 | iscsi_start_tx(conn); | |
2453 | goto done; | |
2454 | ||
2455 | unlock: | |
659743b0 | 2456 | spin_unlock_bh(&session->frwd_lock); |
843c0a8a | 2457 | done: |
bd2199d4 EZ |
2458 | ISCSI_DBG_EH(session, "dev reset result = %s\n", |
2459 | rc == SUCCESS ? "SUCCESS" : "FAILED"); | |
843c0a8a MC |
2460 | mutex_unlock(&session->eh_mutex); |
2461 | return rc; | |
2462 | } | |
2463 | EXPORT_SYMBOL_GPL(iscsi_eh_device_reset); | |
2464 | ||
3fe5ae8b MC |
2465 | void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session) |
2466 | { | |
2467 | struct iscsi_session *session = cls_session->dd_data; | |
2468 | ||
659743b0 | 2469 | spin_lock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2470 | if (session->state != ISCSI_STATE_LOGGED_IN) { |
2471 | session->state = ISCSI_STATE_RECOVERY_FAILED; | |
2472 | if (session->leadconn) | |
2473 | wake_up(&session->leadconn->ehwait); | |
2474 | } | |
659743b0 | 2475 | spin_unlock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2476 | } |
2477 | EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout); | |
2478 | ||
2479 | /** | |
2480 | * iscsi_eh_session_reset - drop session and attempt relogin | |
2481 | * @sc: scsi command | |
2482 | * | |
2483 | * This function will wait for a relogin, session termination from | |
2484 | * userspace, or a recovery/replacement timeout. | |
2485 | */ | |
309ce156 | 2486 | int iscsi_eh_session_reset(struct scsi_cmnd *sc) |
3fe5ae8b MC |
2487 | { |
2488 | struct iscsi_cls_session *cls_session; | |
2489 | struct iscsi_session *session; | |
2490 | struct iscsi_conn *conn; | |
2491 | ||
2492 | cls_session = starget_to_session(scsi_target(sc->device)); | |
2493 | session = cls_session->dd_data; | |
2494 | conn = session->leadconn; | |
2495 | ||
2496 | mutex_lock(&session->eh_mutex); | |
659743b0 | 2497 | spin_lock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2498 | if (session->state == ISCSI_STATE_TERMINATE) { |
2499 | failed: | |
2500 | ISCSI_DBG_EH(session, | |
2501 | "failing session reset: Could not log back into " | |
5db6dd14 FH |
2502 | "%s [age %d]\n", session->targetname, |
2503 | session->age); | |
659743b0 | 2504 | spin_unlock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2505 | mutex_unlock(&session->eh_mutex); |
2506 | return FAILED; | |
2507 | } | |
2508 | ||
659743b0 | 2509 | spin_unlock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2510 | mutex_unlock(&session->eh_mutex); |
2511 | /* | |
2512 | * we drop the lock here but the leadconn cannot be destoyed while | |
2513 | * we are in the scsi eh | |
2514 | */ | |
df4da5cd | 2515 | iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); |
3fe5ae8b MC |
2516 | |
2517 | ISCSI_DBG_EH(session, "wait for relogin\n"); | |
2518 | wait_event_interruptible(conn->ehwait, | |
2519 | session->state == ISCSI_STATE_TERMINATE || | |
2520 | session->state == ISCSI_STATE_LOGGED_IN || | |
2521 | session->state == ISCSI_STATE_RECOVERY_FAILED); | |
2522 | if (signal_pending(current)) | |
2523 | flush_signals(current); | |
2524 | ||
2525 | mutex_lock(&session->eh_mutex); | |
659743b0 | 2526 | spin_lock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2527 | if (session->state == ISCSI_STATE_LOGGED_IN) { |
2528 | ISCSI_DBG_EH(session, | |
2529 | "session reset succeeded for %s,%s\n", | |
2530 | session->targetname, conn->persistent_address); | |
2531 | } else | |
2532 | goto failed; | |
659743b0 | 2533 | spin_unlock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2534 | mutex_unlock(&session->eh_mutex); |
2535 | return SUCCESS; | |
2536 | } | |
309ce156 | 2537 | EXPORT_SYMBOL_GPL(iscsi_eh_session_reset); |
3fe5ae8b MC |
2538 | |
2539 | static void iscsi_prep_tgt_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr) | |
2540 | { | |
2541 | memset(hdr, 0, sizeof(*hdr)); | |
2542 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
2543 | hdr->flags = ISCSI_TM_FUNC_TARGET_WARM_RESET & ISCSI_FLAG_TM_FUNC_MASK; | |
2544 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
2545 | hdr->rtt = RESERVED_ITT; | |
2546 | } | |
2547 | ||
2548 | /** | |
2549 | * iscsi_eh_target_reset - reset target | |
2550 | * @sc: scsi command | |
2551 | * | |
309ce156 | 2552 | * This will attempt to send a warm target reset. |
3fe5ae8b | 2553 | */ |
3907adf6 | 2554 | static int iscsi_eh_target_reset(struct scsi_cmnd *sc) |
3fe5ae8b MC |
2555 | { |
2556 | struct iscsi_cls_session *cls_session; | |
2557 | struct iscsi_session *session; | |
2558 | struct iscsi_conn *conn; | |
2559 | struct iscsi_tm *hdr; | |
2560 | int rc = FAILED; | |
2561 | ||
2562 | cls_session = starget_to_session(scsi_target(sc->device)); | |
2563 | session = cls_session->dd_data; | |
2564 | ||
2565 | ISCSI_DBG_EH(session, "tgt Reset [sc %p tgt %s]\n", sc, | |
2566 | session->targetname); | |
2567 | ||
2568 | mutex_lock(&session->eh_mutex); | |
659743b0 | 2569 | spin_lock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2570 | /* |
2571 | * Just check if we are not logged in. We cannot check for | |
2572 | * the phase because the reset could come from a ioctl. | |
2573 | */ | |
2574 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN) | |
2575 | goto unlock; | |
2576 | conn = session->leadconn; | |
2577 | ||
2578 | /* only have one tmf outstanding at a time */ | |
2579 | if (conn->tmf_state != TMF_INITIAL) | |
2580 | goto unlock; | |
2581 | conn->tmf_state = TMF_QUEUED; | |
2582 | ||
2583 | hdr = &conn->tmhdr; | |
2584 | iscsi_prep_tgt_reset_pdu(sc, hdr); | |
2585 | ||
2586 | if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age, | |
2587 | session->tgt_reset_timeout)) { | |
2588 | rc = FAILED; | |
2589 | goto unlock; | |
2590 | } | |
2591 | ||
2592 | switch (conn->tmf_state) { | |
2593 | case TMF_SUCCESS: | |
2594 | break; | |
2595 | case TMF_TIMEDOUT: | |
659743b0 | 2596 | spin_unlock_bh(&session->frwd_lock); |
df4da5cd | 2597 | iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); |
3fe5ae8b MC |
2598 | goto done; |
2599 | default: | |
2600 | conn->tmf_state = TMF_INITIAL; | |
2601 | goto unlock; | |
2602 | } | |
2603 | ||
2604 | rc = SUCCESS; | |
659743b0 | 2605 | spin_unlock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2606 | |
2607 | iscsi_suspend_tx(conn); | |
2608 | ||
659743b0 | 2609 | spin_lock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2610 | memset(hdr, 0, sizeof(*hdr)); |
2611 | fail_scsi_tasks(conn, -1, DID_ERROR); | |
2612 | conn->tmf_state = TMF_INITIAL; | |
659743b0 | 2613 | spin_unlock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2614 | |
2615 | iscsi_start_tx(conn); | |
2616 | goto done; | |
2617 | ||
2618 | unlock: | |
659743b0 | 2619 | spin_unlock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2620 | done: |
2621 | ISCSI_DBG_EH(session, "tgt %s reset result = %s\n", session->targetname, | |
2622 | rc == SUCCESS ? "SUCCESS" : "FAILED"); | |
2623 | mutex_unlock(&session->eh_mutex); | |
309ce156 JK |
2624 | return rc; |
2625 | } | |
3fe5ae8b | 2626 | |
309ce156 JK |
2627 | /** |
2628 | * iscsi_eh_recover_target - reset target and possibly the session | |
2629 | * @sc: scsi command | |
2630 | * | |
2631 | * This will attempt to send a warm target reset. If that fails, | |
2632 | * we will escalate to ERL0 session recovery. | |
2633 | */ | |
2634 | int iscsi_eh_recover_target(struct scsi_cmnd *sc) | |
2635 | { | |
2636 | int rc; | |
2637 | ||
2638 | rc = iscsi_eh_target_reset(sc); | |
3fe5ae8b MC |
2639 | if (rc == FAILED) |
2640 | rc = iscsi_eh_session_reset(sc); | |
2641 | return rc; | |
2642 | } | |
309ce156 | 2643 | EXPORT_SYMBOL_GPL(iscsi_eh_recover_target); |
3fe5ae8b | 2644 | |
6320377f OK |
2645 | /* |
2646 | * Pre-allocate a pool of @max items of @item_size. By default, the pool | |
2647 | * should be accessed via kfifo_{get,put} on q->queue. | |
2648 | * Optionally, the caller can obtain the array of object pointers | |
2649 | * by passing in a non-NULL @items pointer | |
2650 | */ | |
7996a778 | 2651 | int |
6320377f | 2652 | iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size) |
7996a778 | 2653 | { |
6320377f | 2654 | int i, num_arrays = 1; |
7996a778 | 2655 | |
6320377f | 2656 | memset(q, 0, sizeof(*q)); |
7996a778 MC |
2657 | |
2658 | q->max = max; | |
6320377f OK |
2659 | |
2660 | /* If the user passed an items pointer, he wants a copy of | |
2661 | * the array. */ | |
2662 | if (items) | |
2663 | num_arrays++; | |
778e1cdd | 2664 | q->pool = kvcalloc(num_arrays * max, sizeof(void *), GFP_KERNEL); |
6320377f | 2665 | if (q->pool == NULL) |
f474a37b | 2666 | return -ENOMEM; |
7996a778 | 2667 | |
c1e13f25 | 2668 | kfifo_init(&q->queue, (void*)q->pool, max * sizeof(void*)); |
7996a778 MC |
2669 | |
2670 | for (i = 0; i < max; i++) { | |
6320377f | 2671 | q->pool[i] = kzalloc(item_size, GFP_KERNEL); |
7996a778 | 2672 | if (q->pool[i] == NULL) { |
6320377f OK |
2673 | q->max = i; |
2674 | goto enomem; | |
7996a778 | 2675 | } |
7acd72eb | 2676 | kfifo_in(&q->queue, (void*)&q->pool[i], sizeof(void*)); |
7996a778 | 2677 | } |
6320377f OK |
2678 | |
2679 | if (items) { | |
2680 | *items = q->pool + max; | |
2681 | memcpy(*items, q->pool, max * sizeof(void *)); | |
2682 | } | |
2683 | ||
7996a778 | 2684 | return 0; |
6320377f OK |
2685 | |
2686 | enomem: | |
2687 | iscsi_pool_free(q); | |
2688 | return -ENOMEM; | |
7996a778 MC |
2689 | } |
2690 | EXPORT_SYMBOL_GPL(iscsi_pool_init); | |
2691 | ||
6320377f | 2692 | void iscsi_pool_free(struct iscsi_pool *q) |
7996a778 MC |
2693 | { |
2694 | int i; | |
2695 | ||
2696 | for (i = 0; i < q->max; i++) | |
6320377f | 2697 | kfree(q->pool[i]); |
bfcc62ed | 2698 | kvfree(q->pool); |
7996a778 MC |
2699 | } |
2700 | EXPORT_SYMBOL_GPL(iscsi_pool_free); | |
2701 | ||
b4046922 MC |
2702 | int iscsi_host_get_max_scsi_cmds(struct Scsi_Host *shost, |
2703 | uint16_t requested_cmds_max) | |
2704 | { | |
2705 | int scsi_cmds, total_cmds = requested_cmds_max; | |
2706 | ||
2707 | check: | |
2708 | if (!total_cmds) | |
2709 | total_cmds = ISCSI_DEF_XMIT_CMDS_MAX; | |
2710 | /* | |
2711 | * The iscsi layer needs some tasks for nop handling and tmfs, | |
2712 | * so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX | |
2713 | * + 1 command for scsi IO. | |
2714 | */ | |
2715 | if (total_cmds < ISCSI_TOTAL_CMDS_MIN) { | |
2716 | printk(KERN_ERR "iscsi: invalid max cmds of %d. Must be a power of two that is at least %d.\n", | |
2717 | total_cmds, ISCSI_TOTAL_CMDS_MIN); | |
2718 | return -EINVAL; | |
2719 | } | |
2720 | ||
2721 | if (total_cmds > ISCSI_TOTAL_CMDS_MAX) { | |
2722 | printk(KERN_INFO "iscsi: invalid max cmds of %d. Must be a power of 2 less than or equal to %d. Using %d.\n", | |
2723 | requested_cmds_max, ISCSI_TOTAL_CMDS_MAX, | |
2724 | ISCSI_TOTAL_CMDS_MAX); | |
2725 | total_cmds = ISCSI_TOTAL_CMDS_MAX; | |
2726 | } | |
2727 | ||
2728 | if (!is_power_of_2(total_cmds)) { | |
2729 | total_cmds = rounddown_pow_of_two(total_cmds); | |
2730 | if (total_cmds < ISCSI_TOTAL_CMDS_MIN) { | |
2731 | 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); | |
2732 | return -EINVAL; | |
2733 | } | |
2734 | ||
2735 | printk(KERN_INFO "iscsi: invalid max cmds %d. Must be a power of 2. Rounding max cmds down to %d.\n", | |
2736 | requested_cmds_max, total_cmds); | |
2737 | } | |
2738 | ||
2739 | scsi_cmds = total_cmds - ISCSI_MGMT_CMDS_MAX; | |
2740 | if (shost->can_queue && scsi_cmds > shost->can_queue) { | |
2741 | total_cmds = shost->can_queue; | |
2742 | ||
2743 | printk(KERN_INFO "iscsi: requested max cmds %u is higher than driver limit. Using driver limit %u\n", | |
2744 | requested_cmds_max, shost->can_queue); | |
2745 | goto check; | |
2746 | } | |
2747 | ||
2748 | return scsi_cmds; | |
2749 | } | |
2750 | EXPORT_SYMBOL_GPL(iscsi_host_get_max_scsi_cmds); | |
2751 | ||
a4804cd6 MC |
2752 | /** |
2753 | * iscsi_host_add - add host to system | |
2754 | * @shost: scsi host | |
2755 | * @pdev: parent device | |
2756 | * | |
2757 | * This should be called by partial offload and software iscsi drivers | |
2758 | * to add a host to the system. | |
2759 | */ | |
2760 | int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev) | |
2761 | { | |
8e9a20ce MC |
2762 | if (!shost->can_queue) |
2763 | shost->can_queue = ISCSI_DEF_XMIT_CMDS_MAX; | |
2764 | ||
4d108350 MC |
2765 | if (!shost->cmd_per_lun) |
2766 | shost->cmd_per_lun = ISCSI_DEF_CMD_PER_LUN; | |
2767 | ||
a4804cd6 MC |
2768 | return scsi_add_host(shost, pdev); |
2769 | } | |
2770 | EXPORT_SYMBOL_GPL(iscsi_host_add); | |
2771 | ||
2772 | /** | |
2773 | * iscsi_host_alloc - allocate a host and driver data | |
2774 | * @sht: scsi host template | |
2775 | * @dd_data_size: driver host data size | |
32ae763e | 2776 | * @xmit_can_sleep: bool indicating if LLD will queue IO from a work queue |
a4804cd6 MC |
2777 | * |
2778 | * This should be called by partial offload and software iscsi drivers. | |
2779 | * To access the driver specific memory use the iscsi_host_priv() macro. | |
2780 | */ | |
2781 | struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht, | |
4d108350 | 2782 | int dd_data_size, bool xmit_can_sleep) |
75613521 | 2783 | { |
a4804cd6 | 2784 | struct Scsi_Host *shost; |
e5bd7b54 | 2785 | struct iscsi_host *ihost; |
a4804cd6 MC |
2786 | |
2787 | shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size); | |
2788 | if (!shost) | |
2789 | return NULL; | |
e5bd7b54 | 2790 | ihost = shost_priv(shost); |
32ae763e MC |
2791 | |
2792 | if (xmit_can_sleep) { | |
2793 | snprintf(ihost->workq_name, sizeof(ihost->workq_name), | |
2794 | "iscsi_q_%d", shost->host_no); | |
3ce41966 BL |
2795 | ihost->workq = alloc_workqueue("%s", |
2796 | WQ_SYSFS | __WQ_LEGACY | WQ_MEM_RECLAIM | WQ_UNBOUND, | |
1a982620 | 2797 | 1, ihost->workq_name); |
32ae763e MC |
2798 | if (!ihost->workq) |
2799 | goto free_host; | |
2800 | } | |
2801 | ||
e5bd7b54 MC |
2802 | spin_lock_init(&ihost->lock); |
2803 | ihost->state = ISCSI_HOST_SETUP; | |
2804 | ihost->num_sessions = 0; | |
2805 | init_waitqueue_head(&ihost->session_removal_wq); | |
a4804cd6 | 2806 | return shost; |
32ae763e MC |
2807 | |
2808 | free_host: | |
2809 | scsi_host_put(shost); | |
2810 | return NULL; | |
a4804cd6 MC |
2811 | } |
2812 | EXPORT_SYMBOL_GPL(iscsi_host_alloc); | |
2813 | ||
e5bd7b54 MC |
2814 | static void iscsi_notify_host_removed(struct iscsi_cls_session *cls_session) |
2815 | { | |
40a06e75 | 2816 | iscsi_session_failure(cls_session->dd_data, ISCSI_ERR_INVALID_HOST); |
e5bd7b54 MC |
2817 | } |
2818 | ||
a4804cd6 MC |
2819 | /** |
2820 | * iscsi_host_remove - remove host and sessions | |
2821 | * @shost: scsi host | |
2822 | * | |
e5bd7b54 MC |
2823 | * If there are any sessions left, this will initiate the removal and wait |
2824 | * for the completion. | |
a4804cd6 MC |
2825 | */ |
2826 | void iscsi_host_remove(struct Scsi_Host *shost) | |
2827 | { | |
e5bd7b54 MC |
2828 | struct iscsi_host *ihost = shost_priv(shost); |
2829 | unsigned long flags; | |
2830 | ||
2831 | spin_lock_irqsave(&ihost->lock, flags); | |
2832 | ihost->state = ISCSI_HOST_REMOVED; | |
2833 | spin_unlock_irqrestore(&ihost->lock, flags); | |
2834 | ||
2835 | iscsi_host_for_each_session(shost, iscsi_notify_host_removed); | |
2836 | wait_event_interruptible(ihost->session_removal_wq, | |
2837 | ihost->num_sessions == 0); | |
2838 | if (signal_pending(current)) | |
2839 | flush_signals(current); | |
2840 | ||
a4804cd6 | 2841 | scsi_remove_host(shost); |
75613521 | 2842 | } |
a4804cd6 | 2843 | EXPORT_SYMBOL_GPL(iscsi_host_remove); |
7996a778 | 2844 | |
a4804cd6 | 2845 | void iscsi_host_free(struct Scsi_Host *shost) |
75613521 MC |
2846 | { |
2847 | struct iscsi_host *ihost = shost_priv(shost); | |
7996a778 | 2848 | |
c435f0a9 MC |
2849 | if (ihost->workq) |
2850 | destroy_workqueue(ihost->workq); | |
2851 | ||
75613521 MC |
2852 | kfree(ihost->netdev); |
2853 | kfree(ihost->hwaddress); | |
2854 | kfree(ihost->initiatorname); | |
a4804cd6 | 2855 | scsi_host_put(shost); |
75613521 | 2856 | } |
a4804cd6 | 2857 | EXPORT_SYMBOL_GPL(iscsi_host_free); |
7996a778 | 2858 | |
e5bd7b54 MC |
2859 | static void iscsi_host_dec_session_cnt(struct Scsi_Host *shost) |
2860 | { | |
2861 | struct iscsi_host *ihost = shost_priv(shost); | |
2862 | unsigned long flags; | |
2863 | ||
2864 | shost = scsi_host_get(shost); | |
2865 | if (!shost) { | |
2866 | printk(KERN_ERR "Invalid state. Cannot notify host removal " | |
2867 | "of session teardown event because host already " | |
2868 | "removed.\n"); | |
2869 | return; | |
2870 | } | |
2871 | ||
2872 | spin_lock_irqsave(&ihost->lock, flags); | |
2873 | ihost->num_sessions--; | |
2874 | if (ihost->num_sessions == 0) | |
2875 | wake_up(&ihost->session_removal_wq); | |
2876 | spin_unlock_irqrestore(&ihost->lock, flags); | |
2877 | scsi_host_put(shost); | |
2878 | } | |
2879 | ||
7996a778 MC |
2880 | /** |
2881 | * iscsi_session_setup - create iscsi cls session and host and session | |
7996a778 | 2882 | * @iscsit: iscsi transport template |
75613521 MC |
2883 | * @shost: scsi host |
2884 | * @cmds_max: session can queue | |
ccd4a430 | 2885 | * @dd_size: private driver data size, added to session allocation size |
9c19a7d0 | 2886 | * @cmd_task_size: LLD task private data size |
7996a778 | 2887 | * @initial_cmdsn: initial CmdSN |
ccd4a430 | 2888 | * @id: target ID to add to this session |
7996a778 MC |
2889 | * |
2890 | * This can be used by software iscsi_transports that allocate | |
2891 | * a session per scsi host. | |
3cf7b233 MC |
2892 | * |
2893 | * Callers should set cmds_max to the largest total numer (mgmt + scsi) of | |
2894 | * tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks | |
2895 | * for nop handling and login/logout requests. | |
75613521 | 2896 | */ |
7996a778 | 2897 | struct iscsi_cls_session * |
75613521 | 2898 | iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost, |
b8b9e1b8 | 2899 | uint16_t cmds_max, int dd_size, int cmd_task_size, |
7970634b | 2900 | uint32_t initial_cmdsn, unsigned int id) |
7996a778 | 2901 | { |
e5bd7b54 | 2902 | struct iscsi_host *ihost = shost_priv(shost); |
7996a778 MC |
2903 | struct iscsi_session *session; |
2904 | struct iscsi_cls_session *cls_session; | |
b4046922 | 2905 | int cmd_i, scsi_cmds; |
e5bd7b54 MC |
2906 | unsigned long flags; |
2907 | ||
2908 | spin_lock_irqsave(&ihost->lock, flags); | |
2909 | if (ihost->state == ISCSI_HOST_REMOVED) { | |
2910 | spin_unlock_irqrestore(&ihost->lock, flags); | |
2911 | return NULL; | |
2912 | } | |
2913 | ihost->num_sessions++; | |
2914 | spin_unlock_irqrestore(&ihost->lock, flags); | |
8e9a20ce | 2915 | |
b4046922 MC |
2916 | scsi_cmds = iscsi_host_get_max_scsi_cmds(shost, cmds_max); |
2917 | if (scsi_cmds < 0) | |
e5bd7b54 | 2918 | goto dec_session_count; |
1548271e | 2919 | |
5d91e209 | 2920 | cls_session = iscsi_alloc_session(shost, iscsit, |
b8b9e1b8 JK |
2921 | sizeof(struct iscsi_session) + |
2922 | dd_size); | |
75613521 | 2923 | if (!cls_session) |
e5bd7b54 | 2924 | goto dec_session_count; |
75613521 MC |
2925 | session = cls_session->dd_data; |
2926 | session->cls_session = cls_session; | |
7996a778 MC |
2927 | session->host = shost; |
2928 | session->state = ISCSI_STATE_FREE; | |
f6d5180c | 2929 | session->fast_abort = 1; |
3fe5ae8b | 2930 | session->tgt_reset_timeout = 30; |
4cd49ea1 MC |
2931 | session->lu_reset_timeout = 15; |
2932 | session->abort_timeout = 10; | |
3cf7b233 | 2933 | session->scsi_cmds_max = scsi_cmds; |
b4046922 | 2934 | session->cmds_max = scsi_cmds + ISCSI_MGMT_CMDS_MAX; |
e0726407 | 2935 | session->queued_cmdsn = session->cmdsn = initial_cmdsn; |
7996a778 MC |
2936 | session->exp_cmdsn = initial_cmdsn + 1; |
2937 | session->max_cmdsn = initial_cmdsn + 1; | |
2938 | session->max_r2t = 1; | |
2939 | session->tt = iscsit; | |
b8b9e1b8 | 2940 | session->dd_data = cls_session->dd_data + sizeof(*session); |
659743b0 | 2941 | |
6724add1 | 2942 | mutex_init(&session->eh_mutex); |
659743b0 SP |
2943 | spin_lock_init(&session->frwd_lock); |
2944 | spin_lock_init(&session->back_lock); | |
7996a778 MC |
2945 | |
2946 | /* initialize SCSI PDU commands pool */ | |
2947 | if (iscsi_pool_init(&session->cmdpool, session->cmds_max, | |
2948 | (void***)&session->cmds, | |
9c19a7d0 | 2949 | cmd_task_size + sizeof(struct iscsi_task))) |
7996a778 MC |
2950 | goto cmdpool_alloc_fail; |
2951 | ||
2952 | /* pre-format cmds pool with ITT */ | |
2953 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
9c19a7d0 | 2954 | struct iscsi_task *task = session->cmds[cmd_i]; |
7996a778 | 2955 | |
9c19a7d0 MC |
2956 | if (cmd_task_size) |
2957 | task->dd_data = &task[1]; | |
2958 | task->itt = cmd_i; | |
3bbaaad9 | 2959 | task->state = ISCSI_TASK_FREE; |
9c19a7d0 | 2960 | INIT_LIST_HEAD(&task->running); |
7996a778 MC |
2961 | } |
2962 | ||
f53a88da | 2963 | if (!try_module_get(iscsit->owner)) |
75613521 | 2964 | goto module_get_fail; |
7996a778 | 2965 | |
7970634b | 2966 | if (iscsi_add_session(cls_session, id)) |
75613521 | 2967 | goto cls_session_fail; |
e5bd7b54 | 2968 | |
7996a778 MC |
2969 | return cls_session; |
2970 | ||
2971 | cls_session_fail: | |
75613521 MC |
2972 | module_put(iscsit->owner); |
2973 | module_get_fail: | |
6320377f | 2974 | iscsi_pool_free(&session->cmdpool); |
7996a778 | 2975 | cmdpool_alloc_fail: |
75613521 | 2976 | iscsi_free_session(cls_session); |
e5bd7b54 MC |
2977 | dec_session_count: |
2978 | iscsi_host_dec_session_cnt(shost); | |
7996a778 MC |
2979 | return NULL; |
2980 | } | |
2981 | EXPORT_SYMBOL_GPL(iscsi_session_setup); | |
2982 | ||
2983 | /** | |
2984 | * iscsi_session_teardown - destroy session, host, and cls_session | |
75613521 | 2985 | * @cls_session: iscsi session |
75613521 | 2986 | */ |
7996a778 MC |
2987 | void iscsi_session_teardown(struct iscsi_cls_session *cls_session) |
2988 | { | |
75613521 | 2989 | struct iscsi_session *session = cls_session->dd_data; |
63f75cc8 | 2990 | struct module *owner = cls_session->transport->owner; |
e5bd7b54 | 2991 | struct Scsi_Host *shost = session->host; |
7996a778 | 2992 | |
6320377f | 2993 | iscsi_pool_free(&session->cmdpool); |
7996a778 | 2994 | |
9e10b512 KK |
2995 | iscsi_remove_session(cls_session); |
2996 | ||
b2c64167 MC |
2997 | kfree(session->password); |
2998 | kfree(session->password_in); | |
2999 | kfree(session->username); | |
3000 | kfree(session->username_in); | |
f3ff0c36 | 3001 | kfree(session->targetname); |
3c5c4801 | 3002 | kfree(session->targetalias); |
88dfd340 | 3003 | kfree(session->initiatorname); |
3b9373e9 EW |
3004 | kfree(session->boot_root); |
3005 | kfree(session->boot_nic); | |
3006 | kfree(session->boot_target); | |
88dfd340 | 3007 | kfree(session->ifacename); |
f8525eb4 AC |
3008 | kfree(session->portal_type); |
3009 | kfree(session->discovery_parent_type); | |
f3ff0c36 | 3010 | |
9e10b512 KK |
3011 | iscsi_free_session(cls_session); |
3012 | ||
e5bd7b54 | 3013 | iscsi_host_dec_session_cnt(shost); |
63f75cc8 | 3014 | module_put(owner); |
7996a778 MC |
3015 | } |
3016 | EXPORT_SYMBOL_GPL(iscsi_session_teardown); | |
3017 | ||
3018 | /** | |
3019 | * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn | |
3020 | * @cls_session: iscsi_cls_session | |
5d91e209 | 3021 | * @dd_size: private driver data size |
7996a778 | 3022 | * @conn_idx: cid |
5d91e209 | 3023 | */ |
7996a778 | 3024 | struct iscsi_cls_conn * |
5d91e209 MC |
3025 | iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size, |
3026 | uint32_t conn_idx) | |
7996a778 | 3027 | { |
75613521 | 3028 | struct iscsi_session *session = cls_session->dd_data; |
7996a778 MC |
3029 | struct iscsi_conn *conn; |
3030 | struct iscsi_cls_conn *cls_conn; | |
d36ab6f3 | 3031 | char *data; |
7996a778 | 3032 | |
5d91e209 MC |
3033 | cls_conn = iscsi_create_conn(cls_session, sizeof(*conn) + dd_size, |
3034 | conn_idx); | |
7996a778 MC |
3035 | if (!cls_conn) |
3036 | return NULL; | |
3037 | conn = cls_conn->dd_data; | |
5d91e209 | 3038 | memset(conn, 0, sizeof(*conn) + dd_size); |
7996a778 | 3039 | |
5d91e209 | 3040 | conn->dd_data = cls_conn->dd_data + sizeof(*conn); |
7996a778 MC |
3041 | conn->session = session; |
3042 | conn->cls_conn = cls_conn; | |
3043 | conn->c_stage = ISCSI_CONN_INITIAL_STAGE; | |
3044 | conn->id = conn_idx; | |
3045 | conn->exp_statsn = 0; | |
843c0a8a | 3046 | conn->tmf_state = TMF_INITIAL; |
f6d5180c | 3047 | |
2c4b9637 | 3048 | timer_setup(&conn->transport_timer, iscsi_check_transport_timeouts, 0); |
f6d5180c | 3049 | |
843c0a8a | 3050 | INIT_LIST_HEAD(&conn->mgmtqueue); |
3bbaaad9 | 3051 | INIT_LIST_HEAD(&conn->cmdqueue); |
843c0a8a | 3052 | INIT_LIST_HEAD(&conn->requeue); |
c4028958 | 3053 | INIT_WORK(&conn->xmitwork, iscsi_xmitworker); |
7996a778 | 3054 | |
9c19a7d0 | 3055 | /* allocate login_task used for the login/text sequences */ |
659743b0 | 3056 | spin_lock_bh(&session->frwd_lock); |
7acd72eb | 3057 | if (!kfifo_out(&session->cmdpool.queue, |
9c19a7d0 | 3058 | (void*)&conn->login_task, |
7996a778 | 3059 | sizeof(void*))) { |
659743b0 | 3060 | spin_unlock_bh(&session->frwd_lock); |
9c19a7d0 | 3061 | goto login_task_alloc_fail; |
7996a778 | 3062 | } |
659743b0 | 3063 | spin_unlock_bh(&session->frwd_lock); |
7996a778 | 3064 | |
cfeb2cf9 MC |
3065 | data = (char *) __get_free_pages(GFP_KERNEL, |
3066 | get_order(ISCSI_DEF_MAX_RECV_SEG_LEN)); | |
d36ab6f3 | 3067 | if (!data) |
9c19a7d0 MC |
3068 | goto login_task_data_alloc_fail; |
3069 | conn->login_task->data = conn->data = data; | |
d36ab6f3 | 3070 | |
2c4b9637 | 3071 | timer_setup(&conn->tmf_timer, iscsi_tmf_timedout, 0); |
7996a778 MC |
3072 | init_waitqueue_head(&conn->ehwait); |
3073 | ||
3074 | return cls_conn; | |
3075 | ||
9c19a7d0 | 3076 | login_task_data_alloc_fail: |
7acd72eb | 3077 | kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task, |
d36ab6f3 | 3078 | sizeof(void*)); |
9c19a7d0 | 3079 | login_task_alloc_fail: |
7996a778 MC |
3080 | iscsi_destroy_conn(cls_conn); |
3081 | return NULL; | |
3082 | } | |
3083 | EXPORT_SYMBOL_GPL(iscsi_conn_setup); | |
3084 | ||
3085 | /** | |
3086 | * iscsi_conn_teardown - teardown iscsi connection | |
ccd4a430 | 3087 | * @cls_conn: iscsi class connection |
7996a778 MC |
3088 | * |
3089 | * TODO: we may need to make this into a two step process | |
3090 | * like scsi-mls remove + put host | |
3091 | */ | |
3092 | void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn) | |
3093 | { | |
3094 | struct iscsi_conn *conn = cls_conn->dd_data; | |
3095 | struct iscsi_session *session = conn->session; | |
7996a778 | 3096 | |
f6d5180c MC |
3097 | del_timer_sync(&conn->transport_timer); |
3098 | ||
660d0831 | 3099 | mutex_lock(&session->eh_mutex); |
659743b0 | 3100 | spin_lock_bh(&session->frwd_lock); |
7996a778 MC |
3101 | conn->c_stage = ISCSI_CONN_CLEANUP_WAIT; |
3102 | if (session->leadconn == conn) { | |
3103 | /* | |
3104 | * leading connection? then give up on recovery. | |
3105 | */ | |
3106 | session->state = ISCSI_STATE_TERMINATE; | |
3107 | wake_up(&conn->ehwait); | |
3108 | } | |
659743b0 | 3109 | spin_unlock_bh(&session->frwd_lock); |
7996a778 | 3110 | |
779ea120 | 3111 | /* flush queued up work because we free the connection below */ |
843c0a8a | 3112 | iscsi_suspend_tx(conn); |
779ea120 | 3113 | |
659743b0 | 3114 | spin_lock_bh(&session->frwd_lock); |
cfeb2cf9 MC |
3115 | free_pages((unsigned long) conn->data, |
3116 | get_order(ISCSI_DEF_MAX_RECV_SEG_LEN)); | |
f3ff0c36 | 3117 | kfree(conn->persistent_address); |
ae56ff40 | 3118 | kfree(conn->local_ipaddr); |
659743b0 SP |
3119 | /* regular RX path uses back_lock */ |
3120 | spin_lock_bh(&session->back_lock); | |
7acd72eb | 3121 | kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task, |
7996a778 | 3122 | sizeof(void*)); |
659743b0 | 3123 | spin_unlock_bh(&session->back_lock); |
e0726407 | 3124 | if (session->leadconn == conn) |
7996a778 | 3125 | session->leadconn = NULL; |
659743b0 | 3126 | spin_unlock_bh(&session->frwd_lock); |
660d0831 | 3127 | mutex_unlock(&session->eh_mutex); |
7996a778 | 3128 | |
7996a778 MC |
3129 | iscsi_destroy_conn(cls_conn); |
3130 | } | |
3131 | EXPORT_SYMBOL_GPL(iscsi_conn_teardown); | |
3132 | ||
3133 | int iscsi_conn_start(struct iscsi_cls_conn *cls_conn) | |
3134 | { | |
3135 | struct iscsi_conn *conn = cls_conn->dd_data; | |
3136 | struct iscsi_session *session = conn->session; | |
3137 | ||
ffd0436e | 3138 | if (!session) { |
322d739d MC |
3139 | iscsi_conn_printk(KERN_ERR, conn, |
3140 | "can't start unbound connection\n"); | |
7996a778 MC |
3141 | return -EPERM; |
3142 | } | |
3143 | ||
db98ccde MC |
3144 | if ((session->imm_data_en || !session->initial_r2t_en) && |
3145 | session->first_burst > session->max_burst) { | |
322d739d MC |
3146 | iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: " |
3147 | "first_burst %d max_burst %d\n", | |
3148 | session->first_burst, session->max_burst); | |
ffd0436e MC |
3149 | return -EINVAL; |
3150 | } | |
3151 | ||
f6d5180c | 3152 | if (conn->ping_timeout && !conn->recv_timeout) { |
322d739d MC |
3153 | iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of " |
3154 | "zero. Using 5 seconds\n."); | |
f6d5180c MC |
3155 | conn->recv_timeout = 5; |
3156 | } | |
3157 | ||
3158 | if (conn->recv_timeout && !conn->ping_timeout) { | |
322d739d MC |
3159 | iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of " |
3160 | "zero. Using 5 seconds.\n"); | |
f6d5180c MC |
3161 | conn->ping_timeout = 5; |
3162 | } | |
3163 | ||
659743b0 | 3164 | spin_lock_bh(&session->frwd_lock); |
7996a778 MC |
3165 | conn->c_stage = ISCSI_CONN_STARTED; |
3166 | session->state = ISCSI_STATE_LOGGED_IN; | |
e0726407 | 3167 | session->queued_cmdsn = session->cmdsn; |
7996a778 | 3168 | |
f6d5180c MC |
3169 | conn->last_recv = jiffies; |
3170 | conn->last_ping = jiffies; | |
3171 | if (conn->recv_timeout && conn->ping_timeout) | |
3172 | mod_timer(&conn->transport_timer, | |
3173 | jiffies + (conn->recv_timeout * HZ)); | |
3174 | ||
7996a778 MC |
3175 | switch(conn->stop_stage) { |
3176 | case STOP_CONN_RECOVER: | |
3177 | /* | |
3178 | * unblock eh_abort() if it is blocked. re-try all | |
3179 | * commands after successful recovery | |
3180 | */ | |
7996a778 | 3181 | conn->stop_stage = 0; |
843c0a8a | 3182 | conn->tmf_state = TMF_INITIAL; |
7996a778 | 3183 | session->age++; |
8b1d0343 MC |
3184 | if (session->age == 16) |
3185 | session->age = 0; | |
6eabafbe | 3186 | break; |
7996a778 | 3187 | case STOP_CONN_TERM: |
7996a778 | 3188 | conn->stop_stage = 0; |
7996a778 MC |
3189 | break; |
3190 | default: | |
3191 | break; | |
3192 | } | |
659743b0 | 3193 | spin_unlock_bh(&session->frwd_lock); |
7996a778 | 3194 | |
75613521 | 3195 | iscsi_unblock_session(session->cls_session); |
6eabafbe | 3196 | wake_up(&conn->ehwait); |
7996a778 MC |
3197 | return 0; |
3198 | } | |
3199 | EXPORT_SYMBOL_GPL(iscsi_conn_start); | |
3200 | ||
3201 | static void | |
3bbaaad9 | 3202 | fail_mgmt_tasks(struct iscsi_session *session, struct iscsi_conn *conn) |
7996a778 | 3203 | { |
3bbaaad9 | 3204 | struct iscsi_task *task; |
b3cd5050 | 3205 | int i, state; |
7996a778 | 3206 | |
3bbaaad9 MC |
3207 | for (i = 0; i < conn->session->cmds_max; i++) { |
3208 | task = conn->session->cmds[i]; | |
3209 | if (task->sc) | |
3210 | continue; | |
7996a778 | 3211 | |
3bbaaad9 MC |
3212 | if (task->state == ISCSI_TASK_FREE) |
3213 | continue; | |
7996a778 | 3214 | |
3bbaaad9 MC |
3215 | ISCSI_DBG_SESSION(conn->session, |
3216 | "failing mgmt itt 0x%x state %d\n", | |
3217 | task->itt, task->state); | |
5923d64b MC |
3218 | |
3219 | spin_lock_bh(&session->back_lock); | |
3220 | if (cleanup_queued_task(task)) { | |
3221 | spin_unlock_bh(&session->back_lock); | |
3222 | continue; | |
3223 | } | |
3224 | ||
b3cd5050 MC |
3225 | state = ISCSI_TASK_ABRT_SESS_RECOV; |
3226 | if (task->state == ISCSI_TASK_PENDING) | |
3227 | state = ISCSI_TASK_COMPLETED; | |
3228 | iscsi_complete_task(task, state); | |
a656183e | 3229 | spin_unlock_bh(&session->back_lock); |
3bbaaad9 | 3230 | } |
7996a778 MC |
3231 | } |
3232 | ||
0dcf8feb | 3233 | void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) |
7996a778 | 3234 | { |
0dcf8feb MC |
3235 | struct iscsi_conn *conn = cls_conn->dd_data; |
3236 | struct iscsi_session *session = conn->session; | |
ed2abc7f MC |
3237 | int old_stop_stage; |
3238 | ||
6724add1 | 3239 | mutex_lock(&session->eh_mutex); |
659743b0 | 3240 | spin_lock_bh(&session->frwd_lock); |
ed2abc7f | 3241 | if (conn->stop_stage == STOP_CONN_TERM) { |
659743b0 | 3242 | spin_unlock_bh(&session->frwd_lock); |
6724add1 MC |
3243 | mutex_unlock(&session->eh_mutex); |
3244 | return; | |
3245 | } | |
3246 | ||
ed2abc7f MC |
3247 | /* |
3248 | * When this is called for the in_login state, we only want to clean | |
9c19a7d0 | 3249 | * up the login task and connection. We do not need to block and set |
67a61114 | 3250 | * the recovery state again |
ed2abc7f | 3251 | */ |
67a61114 MC |
3252 | if (flag == STOP_CONN_TERM) |
3253 | session->state = ISCSI_STATE_TERMINATE; | |
3254 | else if (conn->stop_stage != STOP_CONN_RECOVER) | |
3255 | session->state = ISCSI_STATE_IN_RECOVERY; | |
4ae0a6c1 MC |
3256 | |
3257 | old_stop_stage = conn->stop_stage; | |
3258 | conn->stop_stage = flag; | |
659743b0 | 3259 | spin_unlock_bh(&session->frwd_lock); |
ed2abc7f | 3260 | |
26013ad4 MC |
3261 | del_timer_sync(&conn->transport_timer); |
3262 | iscsi_suspend_tx(conn); | |
3263 | ||
659743b0 | 3264 | spin_lock_bh(&session->frwd_lock); |
67a61114 | 3265 | conn->c_stage = ISCSI_CONN_STOPPED; |
659743b0 | 3266 | spin_unlock_bh(&session->frwd_lock); |
6724add1 | 3267 | |
7996a778 MC |
3268 | /* |
3269 | * for connection level recovery we should not calculate | |
3270 | * header digest. conn->hdr_size used for optimization | |
3271 | * in hdr_extract() and will be re-negotiated at | |
3272 | * set_param() time. | |
3273 | */ | |
3274 | if (flag == STOP_CONN_RECOVER) { | |
3275 | conn->hdrdgst_en = 0; | |
3276 | conn->datadgst_en = 0; | |
656cffc9 | 3277 | if (session->state == ISCSI_STATE_IN_RECOVERY && |
67a61114 | 3278 | old_stop_stage != STOP_CONN_RECOVER) { |
1b2c7af8 | 3279 | ISCSI_DBG_SESSION(session, "blocking session\n"); |
75613521 | 3280 | iscsi_block_session(session->cls_session); |
67a61114 | 3281 | } |
7996a778 | 3282 | } |
656cffc9 | 3283 | |
656cffc9 MC |
3284 | /* |
3285 | * flush queues. | |
3286 | */ | |
659743b0 | 3287 | spin_lock_bh(&session->frwd_lock); |
b3cd5050 | 3288 | fail_scsi_tasks(conn, -1, DID_TRANSPORT_DISRUPTED); |
3bbaaad9 | 3289 | fail_mgmt_tasks(session, conn); |
5d12c05e | 3290 | memset(&conn->tmhdr, 0, sizeof(conn->tmhdr)); |
659743b0 | 3291 | spin_unlock_bh(&session->frwd_lock); |
6724add1 | 3292 | mutex_unlock(&session->eh_mutex); |
7996a778 | 3293 | } |
7996a778 MC |
3294 | EXPORT_SYMBOL_GPL(iscsi_conn_stop); |
3295 | ||
3296 | int iscsi_conn_bind(struct iscsi_cls_session *cls_session, | |
3297 | struct iscsi_cls_conn *cls_conn, int is_leading) | |
3298 | { | |
75613521 | 3299 | struct iscsi_session *session = cls_session->dd_data; |
98644047 | 3300 | struct iscsi_conn *conn = cls_conn->dd_data; |
7996a778 | 3301 | |
659743b0 | 3302 | spin_lock_bh(&session->frwd_lock); |
7996a778 MC |
3303 | if (is_leading) |
3304 | session->leadconn = conn; | |
659743b0 | 3305 | spin_unlock_bh(&session->frwd_lock); |
7996a778 | 3306 | |
c8447e4c MC |
3307 | /* |
3308 | * The target could have reduced it's window size between logins, so | |
3309 | * we have to reset max/exp cmdsn so we can see the new values. | |
3310 | */ | |
3311 | spin_lock_bh(&session->back_lock); | |
3312 | session->max_cmdsn = session->exp_cmdsn = session->cmdsn + 1; | |
3313 | spin_unlock_bh(&session->back_lock); | |
7996a778 MC |
3314 | /* |
3315 | * Unblock xmitworker(), Login Phase will pass through. | |
3316 | */ | |
3317 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
3318 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
3319 | return 0; | |
3320 | } | |
3321 | EXPORT_SYMBOL_GPL(iscsi_conn_bind); | |
3322 | ||
adaf6990 | 3323 | int iscsi_switch_str_param(char **param, char *new_val_buf) |
5700b1af MC |
3324 | { |
3325 | char *new_val; | |
3326 | ||
3327 | if (*param) { | |
3328 | if (!strcmp(*param, new_val_buf)) | |
3329 | return 0; | |
3330 | } | |
3331 | ||
3332 | new_val = kstrdup(new_val_buf, GFP_NOIO); | |
3333 | if (!new_val) | |
3334 | return -ENOMEM; | |
3335 | ||
3336 | kfree(*param); | |
3337 | *param = new_val; | |
3338 | return 0; | |
3339 | } | |
adaf6990 | 3340 | EXPORT_SYMBOL_GPL(iscsi_switch_str_param); |
a54a52ca MC |
3341 | |
3342 | int iscsi_set_param(struct iscsi_cls_conn *cls_conn, | |
3343 | enum iscsi_param param, char *buf, int buflen) | |
3344 | { | |
3345 | struct iscsi_conn *conn = cls_conn->dd_data; | |
3346 | struct iscsi_session *session = conn->session; | |
6a06a4b8 | 3347 | int val; |
a54a52ca MC |
3348 | |
3349 | switch(param) { | |
843c0a8a MC |
3350 | case ISCSI_PARAM_FAST_ABORT: |
3351 | sscanf(buf, "%d", &session->fast_abort); | |
3352 | break; | |
f6d5180c MC |
3353 | case ISCSI_PARAM_ABORT_TMO: |
3354 | sscanf(buf, "%d", &session->abort_timeout); | |
3355 | break; | |
3356 | case ISCSI_PARAM_LU_RESET_TMO: | |
3357 | sscanf(buf, "%d", &session->lu_reset_timeout); | |
3358 | break; | |
3fe5ae8b MC |
3359 | case ISCSI_PARAM_TGT_RESET_TMO: |
3360 | sscanf(buf, "%d", &session->tgt_reset_timeout); | |
3361 | break; | |
f6d5180c MC |
3362 | case ISCSI_PARAM_PING_TMO: |
3363 | sscanf(buf, "%d", &conn->ping_timeout); | |
3364 | break; | |
3365 | case ISCSI_PARAM_RECV_TMO: | |
3366 | sscanf(buf, "%d", &conn->recv_timeout); | |
3367 | break; | |
a54a52ca MC |
3368 | case ISCSI_PARAM_MAX_RECV_DLENGTH: |
3369 | sscanf(buf, "%d", &conn->max_recv_dlength); | |
3370 | break; | |
3371 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
3372 | sscanf(buf, "%d", &conn->max_xmit_dlength); | |
3373 | break; | |
3374 | case ISCSI_PARAM_HDRDGST_EN: | |
3375 | sscanf(buf, "%d", &conn->hdrdgst_en); | |
3376 | break; | |
3377 | case ISCSI_PARAM_DATADGST_EN: | |
3378 | sscanf(buf, "%d", &conn->datadgst_en); | |
3379 | break; | |
3380 | case ISCSI_PARAM_INITIAL_R2T_EN: | |
3381 | sscanf(buf, "%d", &session->initial_r2t_en); | |
3382 | break; | |
3383 | case ISCSI_PARAM_MAX_R2T: | |
1304be5f | 3384 | sscanf(buf, "%hu", &session->max_r2t); |
a54a52ca MC |
3385 | break; |
3386 | case ISCSI_PARAM_IMM_DATA_EN: | |
3387 | sscanf(buf, "%d", &session->imm_data_en); | |
3388 | break; | |
3389 | case ISCSI_PARAM_FIRST_BURST: | |
3390 | sscanf(buf, "%d", &session->first_burst); | |
3391 | break; | |
3392 | case ISCSI_PARAM_MAX_BURST: | |
3393 | sscanf(buf, "%d", &session->max_burst); | |
3394 | break; | |
3395 | case ISCSI_PARAM_PDU_INORDER_EN: | |
3396 | sscanf(buf, "%d", &session->pdu_inorder_en); | |
3397 | break; | |
3398 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
3399 | sscanf(buf, "%d", &session->dataseq_inorder_en); | |
3400 | break; | |
3401 | case ISCSI_PARAM_ERL: | |
3402 | sscanf(buf, "%d", &session->erl); | |
3403 | break; | |
a54a52ca MC |
3404 | case ISCSI_PARAM_EXP_STATSN: |
3405 | sscanf(buf, "%u", &conn->exp_statsn); | |
3406 | break; | |
b2c64167 | 3407 | case ISCSI_PARAM_USERNAME: |
5700b1af | 3408 | return iscsi_switch_str_param(&session->username, buf); |
b2c64167 | 3409 | case ISCSI_PARAM_USERNAME_IN: |
5700b1af | 3410 | return iscsi_switch_str_param(&session->username_in, buf); |
b2c64167 | 3411 | case ISCSI_PARAM_PASSWORD: |
5700b1af | 3412 | return iscsi_switch_str_param(&session->password, buf); |
b2c64167 | 3413 | case ISCSI_PARAM_PASSWORD_IN: |
5700b1af | 3414 | return iscsi_switch_str_param(&session->password_in, buf); |
a54a52ca | 3415 | case ISCSI_PARAM_TARGET_NAME: |
5700b1af | 3416 | return iscsi_switch_str_param(&session->targetname, buf); |
3c5c4801 VC |
3417 | case ISCSI_PARAM_TARGET_ALIAS: |
3418 | return iscsi_switch_str_param(&session->targetalias, buf); | |
a54a52ca MC |
3419 | case ISCSI_PARAM_TPGT: |
3420 | sscanf(buf, "%d", &session->tpgt); | |
3421 | break; | |
3422 | case ISCSI_PARAM_PERSISTENT_PORT: | |
3423 | sscanf(buf, "%d", &conn->persistent_port); | |
3424 | break; | |
3425 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
5700b1af | 3426 | return iscsi_switch_str_param(&conn->persistent_address, buf); |
88dfd340 | 3427 | case ISCSI_PARAM_IFACE_NAME: |
5700b1af | 3428 | return iscsi_switch_str_param(&session->ifacename, buf); |
88dfd340 | 3429 | case ISCSI_PARAM_INITIATOR_NAME: |
5700b1af | 3430 | return iscsi_switch_str_param(&session->initiatorname, buf); |
3b9373e9 EW |
3431 | case ISCSI_PARAM_BOOT_ROOT: |
3432 | return iscsi_switch_str_param(&session->boot_root, buf); | |
3433 | case ISCSI_PARAM_BOOT_NIC: | |
3434 | return iscsi_switch_str_param(&session->boot_nic, buf); | |
3435 | case ISCSI_PARAM_BOOT_TARGET: | |
3436 | return iscsi_switch_str_param(&session->boot_target, buf); | |
f8525eb4 AC |
3437 | case ISCSI_PARAM_PORTAL_TYPE: |
3438 | return iscsi_switch_str_param(&session->portal_type, buf); | |
3439 | case ISCSI_PARAM_DISCOVERY_PARENT_TYPE: | |
3440 | return iscsi_switch_str_param(&session->discovery_parent_type, | |
3441 | buf); | |
6a06a4b8 OG |
3442 | case ISCSI_PARAM_DISCOVERY_SESS: |
3443 | sscanf(buf, "%d", &val); | |
3444 | session->discovery_sess = !!val; | |
3445 | break; | |
ae56ff40 AC |
3446 | case ISCSI_PARAM_LOCAL_IPADDR: |
3447 | return iscsi_switch_str_param(&conn->local_ipaddr, buf); | |
a54a52ca MC |
3448 | default: |
3449 | return -ENOSYS; | |
3450 | } | |
3451 | ||
3452 | return 0; | |
3453 | } | |
3454 | EXPORT_SYMBOL_GPL(iscsi_set_param); | |
3455 | ||
3456 | int iscsi_session_get_param(struct iscsi_cls_session *cls_session, | |
3457 | enum iscsi_param param, char *buf) | |
3458 | { | |
75613521 | 3459 | struct iscsi_session *session = cls_session->dd_data; |
a54a52ca MC |
3460 | int len; |
3461 | ||
3462 | switch(param) { | |
843c0a8a | 3463 | case ISCSI_PARAM_FAST_ABORT: |
ec98ea70 | 3464 | len = sysfs_emit(buf, "%d\n", session->fast_abort); |
843c0a8a | 3465 | break; |
f6d5180c | 3466 | case ISCSI_PARAM_ABORT_TMO: |
ec98ea70 | 3467 | len = sysfs_emit(buf, "%d\n", session->abort_timeout); |
f6d5180c MC |
3468 | break; |
3469 | case ISCSI_PARAM_LU_RESET_TMO: | |
ec98ea70 | 3470 | len = sysfs_emit(buf, "%d\n", session->lu_reset_timeout); |
f6d5180c | 3471 | break; |
3fe5ae8b | 3472 | case ISCSI_PARAM_TGT_RESET_TMO: |
ec98ea70 | 3473 | len = sysfs_emit(buf, "%d\n", session->tgt_reset_timeout); |
3fe5ae8b | 3474 | break; |
a54a52ca | 3475 | case ISCSI_PARAM_INITIAL_R2T_EN: |
ec98ea70 | 3476 | len = sysfs_emit(buf, "%d\n", session->initial_r2t_en); |
a54a52ca MC |
3477 | break; |
3478 | case ISCSI_PARAM_MAX_R2T: | |
ec98ea70 | 3479 | len = sysfs_emit(buf, "%hu\n", session->max_r2t); |
a54a52ca MC |
3480 | break; |
3481 | case ISCSI_PARAM_IMM_DATA_EN: | |
ec98ea70 | 3482 | len = sysfs_emit(buf, "%d\n", session->imm_data_en); |
a54a52ca MC |
3483 | break; |
3484 | case ISCSI_PARAM_FIRST_BURST: | |
ec98ea70 | 3485 | len = sysfs_emit(buf, "%u\n", session->first_burst); |
a54a52ca MC |
3486 | break; |
3487 | case ISCSI_PARAM_MAX_BURST: | |
ec98ea70 | 3488 | len = sysfs_emit(buf, "%u\n", session->max_burst); |
a54a52ca MC |
3489 | break; |
3490 | case ISCSI_PARAM_PDU_INORDER_EN: | |
ec98ea70 | 3491 | len = sysfs_emit(buf, "%d\n", session->pdu_inorder_en); |
a54a52ca MC |
3492 | break; |
3493 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
ec98ea70 | 3494 | len = sysfs_emit(buf, "%d\n", session->dataseq_inorder_en); |
a54a52ca | 3495 | break; |
5f09e1f3 | 3496 | case ISCSI_PARAM_DEF_TASKMGMT_TMO: |
ec98ea70 | 3497 | len = sysfs_emit(buf, "%d\n", session->def_taskmgmt_tmo); |
5f09e1f3 | 3498 | break; |
a54a52ca | 3499 | case ISCSI_PARAM_ERL: |
ec98ea70 | 3500 | len = sysfs_emit(buf, "%d\n", session->erl); |
a54a52ca MC |
3501 | break; |
3502 | case ISCSI_PARAM_TARGET_NAME: | |
ec98ea70 | 3503 | len = sysfs_emit(buf, "%s\n", session->targetname); |
a54a52ca | 3504 | break; |
3c5c4801 | 3505 | case ISCSI_PARAM_TARGET_ALIAS: |
ec98ea70 | 3506 | len = sysfs_emit(buf, "%s\n", session->targetalias); |
3c5c4801 | 3507 | break; |
a54a52ca | 3508 | case ISCSI_PARAM_TPGT: |
ec98ea70 | 3509 | len = sysfs_emit(buf, "%d\n", session->tpgt); |
a54a52ca | 3510 | break; |
b2c64167 | 3511 | case ISCSI_PARAM_USERNAME: |
ec98ea70 | 3512 | len = sysfs_emit(buf, "%s\n", session->username); |
b2c64167 MC |
3513 | break; |
3514 | case ISCSI_PARAM_USERNAME_IN: | |
ec98ea70 | 3515 | len = sysfs_emit(buf, "%s\n", session->username_in); |
b2c64167 MC |
3516 | break; |
3517 | case ISCSI_PARAM_PASSWORD: | |
ec98ea70 | 3518 | len = sysfs_emit(buf, "%s\n", session->password); |
b2c64167 MC |
3519 | break; |
3520 | case ISCSI_PARAM_PASSWORD_IN: | |
ec98ea70 | 3521 | len = sysfs_emit(buf, "%s\n", session->password_in); |
b2c64167 | 3522 | break; |
88dfd340 | 3523 | case ISCSI_PARAM_IFACE_NAME: |
ec98ea70 | 3524 | len = sysfs_emit(buf, "%s\n", session->ifacename); |
88dfd340 MC |
3525 | break; |
3526 | case ISCSI_PARAM_INITIATOR_NAME: | |
ec98ea70 | 3527 | len = sysfs_emit(buf, "%s\n", session->initiatorname); |
88dfd340 | 3528 | break; |
3b9373e9 | 3529 | case ISCSI_PARAM_BOOT_ROOT: |
ec98ea70 | 3530 | len = sysfs_emit(buf, "%s\n", session->boot_root); |
3b9373e9 EW |
3531 | break; |
3532 | case ISCSI_PARAM_BOOT_NIC: | |
ec98ea70 | 3533 | len = sysfs_emit(buf, "%s\n", session->boot_nic); |
3b9373e9 EW |
3534 | break; |
3535 | case ISCSI_PARAM_BOOT_TARGET: | |
ec98ea70 | 3536 | len = sysfs_emit(buf, "%s\n", session->boot_target); |
9a2307b1 | 3537 | break; |
f8525eb4 | 3538 | case ISCSI_PARAM_AUTO_SND_TGT_DISABLE: |
ec98ea70 | 3539 | len = sysfs_emit(buf, "%u\n", session->auto_snd_tgt_disable); |
f8525eb4 AC |
3540 | break; |
3541 | case ISCSI_PARAM_DISCOVERY_SESS: | |
ec98ea70 | 3542 | len = sysfs_emit(buf, "%u\n", session->discovery_sess); |
f8525eb4 AC |
3543 | break; |
3544 | case ISCSI_PARAM_PORTAL_TYPE: | |
ec98ea70 | 3545 | len = sysfs_emit(buf, "%s\n", session->portal_type); |
f8525eb4 AC |
3546 | break; |
3547 | case ISCSI_PARAM_CHAP_AUTH_EN: | |
ec98ea70 | 3548 | len = sysfs_emit(buf, "%u\n", session->chap_auth_en); |
f8525eb4 AC |
3549 | break; |
3550 | case ISCSI_PARAM_DISCOVERY_LOGOUT_EN: | |
ec98ea70 | 3551 | len = sysfs_emit(buf, "%u\n", session->discovery_logout_en); |
f8525eb4 AC |
3552 | break; |
3553 | case ISCSI_PARAM_BIDI_CHAP_EN: | |
ec98ea70 | 3554 | len = sysfs_emit(buf, "%u\n", session->bidi_chap_en); |
f8525eb4 AC |
3555 | break; |
3556 | case ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL: | |
ec98ea70 | 3557 | len = sysfs_emit(buf, "%u\n", session->discovery_auth_optional); |
f8525eb4 AC |
3558 | break; |
3559 | case ISCSI_PARAM_DEF_TIME2WAIT: | |
ec98ea70 | 3560 | len = sysfs_emit(buf, "%d\n", session->time2wait); |
f8525eb4 AC |
3561 | break; |
3562 | case ISCSI_PARAM_DEF_TIME2RETAIN: | |
ec98ea70 | 3563 | len = sysfs_emit(buf, "%d\n", session->time2retain); |
f8525eb4 AC |
3564 | break; |
3565 | case ISCSI_PARAM_TSID: | |
ec98ea70 | 3566 | len = sysfs_emit(buf, "%u\n", session->tsid); |
f8525eb4 AC |
3567 | break; |
3568 | case ISCSI_PARAM_ISID: | |
ec98ea70 | 3569 | len = sysfs_emit(buf, "%02x%02x%02x%02x%02x%02x\n", |
f8525eb4 AC |
3570 | session->isid[0], session->isid[1], |
3571 | session->isid[2], session->isid[3], | |
3572 | session->isid[4], session->isid[5]); | |
3573 | break; | |
3574 | case ISCSI_PARAM_DISCOVERY_PARENT_IDX: | |
ec98ea70 | 3575 | len = sysfs_emit(buf, "%u\n", session->discovery_parent_idx); |
f8525eb4 AC |
3576 | break; |
3577 | case ISCSI_PARAM_DISCOVERY_PARENT_TYPE: | |
3578 | if (session->discovery_parent_type) | |
ec98ea70 | 3579 | len = sysfs_emit(buf, "%s\n", |
f8525eb4 AC |
3580 | session->discovery_parent_type); |
3581 | else | |
ec98ea70 | 3582 | len = sysfs_emit(buf, "\n"); |
3b9373e9 | 3583 | break; |
a54a52ca MC |
3584 | default: |
3585 | return -ENOSYS; | |
3586 | } | |
3587 | ||
3588 | return len; | |
3589 | } | |
3590 | EXPORT_SYMBOL_GPL(iscsi_session_get_param); | |
3591 | ||
00f3708e MC |
3592 | int iscsi_conn_get_addr_param(struct sockaddr_storage *addr, |
3593 | enum iscsi_param param, char *buf) | |
3594 | { | |
3595 | struct sockaddr_in6 *sin6 = NULL; | |
3596 | struct sockaddr_in *sin = NULL; | |
3597 | int len; | |
3598 | ||
3599 | switch (addr->ss_family) { | |
3600 | case AF_INET: | |
3601 | sin = (struct sockaddr_in *)addr; | |
3602 | break; | |
3603 | case AF_INET6: | |
3604 | sin6 = (struct sockaddr_in6 *)addr; | |
3605 | break; | |
3606 | default: | |
3607 | return -EINVAL; | |
3608 | } | |
3609 | ||
3610 | switch (param) { | |
3611 | case ISCSI_PARAM_CONN_ADDRESS: | |
3612 | case ISCSI_HOST_PARAM_IPADDRESS: | |
3613 | if (sin) | |
ec98ea70 | 3614 | len = sysfs_emit(buf, "%pI4\n", &sin->sin_addr.s_addr); |
00f3708e | 3615 | else |
ec98ea70 | 3616 | len = sysfs_emit(buf, "%pI6\n", &sin6->sin6_addr); |
00f3708e MC |
3617 | break; |
3618 | case ISCSI_PARAM_CONN_PORT: | |
4bfb8ebf | 3619 | case ISCSI_PARAM_LOCAL_PORT: |
00f3708e | 3620 | if (sin) |
ec98ea70 | 3621 | len = sysfs_emit(buf, "%hu\n", be16_to_cpu(sin->sin_port)); |
00f3708e | 3622 | else |
ec98ea70 | 3623 | len = sysfs_emit(buf, "%hu\n", |
00f3708e MC |
3624 | be16_to_cpu(sin6->sin6_port)); |
3625 | break; | |
3626 | default: | |
3627 | return -EINVAL; | |
3628 | } | |
3629 | ||
3630 | return len; | |
3631 | } | |
3632 | EXPORT_SYMBOL_GPL(iscsi_conn_get_addr_param); | |
3633 | ||
a54a52ca MC |
3634 | int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn, |
3635 | enum iscsi_param param, char *buf) | |
3636 | { | |
3637 | struct iscsi_conn *conn = cls_conn->dd_data; | |
3638 | int len; | |
3639 | ||
3640 | switch(param) { | |
f6d5180c | 3641 | case ISCSI_PARAM_PING_TMO: |
ec98ea70 | 3642 | len = sysfs_emit(buf, "%u\n", conn->ping_timeout); |
f6d5180c MC |
3643 | break; |
3644 | case ISCSI_PARAM_RECV_TMO: | |
ec98ea70 | 3645 | len = sysfs_emit(buf, "%u\n", conn->recv_timeout); |
f6d5180c | 3646 | break; |
a54a52ca | 3647 | case ISCSI_PARAM_MAX_RECV_DLENGTH: |
ec98ea70 | 3648 | len = sysfs_emit(buf, "%u\n", conn->max_recv_dlength); |
a54a52ca MC |
3649 | break; |
3650 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
ec98ea70 | 3651 | len = sysfs_emit(buf, "%u\n", conn->max_xmit_dlength); |
a54a52ca MC |
3652 | break; |
3653 | case ISCSI_PARAM_HDRDGST_EN: | |
ec98ea70 | 3654 | len = sysfs_emit(buf, "%d\n", conn->hdrdgst_en); |
a54a52ca MC |
3655 | break; |
3656 | case ISCSI_PARAM_DATADGST_EN: | |
ec98ea70 | 3657 | len = sysfs_emit(buf, "%d\n", conn->datadgst_en); |
a54a52ca MC |
3658 | break; |
3659 | case ISCSI_PARAM_IFMARKER_EN: | |
ec98ea70 | 3660 | len = sysfs_emit(buf, "%d\n", conn->ifmarker_en); |
a54a52ca MC |
3661 | break; |
3662 | case ISCSI_PARAM_OFMARKER_EN: | |
ec98ea70 | 3663 | len = sysfs_emit(buf, "%d\n", conn->ofmarker_en); |
a54a52ca MC |
3664 | break; |
3665 | case ISCSI_PARAM_EXP_STATSN: | |
ec98ea70 | 3666 | len = sysfs_emit(buf, "%u\n", conn->exp_statsn); |
a54a52ca MC |
3667 | break; |
3668 | case ISCSI_PARAM_PERSISTENT_PORT: | |
ec98ea70 | 3669 | len = sysfs_emit(buf, "%d\n", conn->persistent_port); |
a54a52ca MC |
3670 | break; |
3671 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
ec98ea70 | 3672 | len = sysfs_emit(buf, "%s\n", conn->persistent_address); |
a54a52ca | 3673 | break; |
f8525eb4 | 3674 | case ISCSI_PARAM_STATSN: |
ec98ea70 | 3675 | len = sysfs_emit(buf, "%u\n", conn->statsn); |
f8525eb4 AC |
3676 | break; |
3677 | case ISCSI_PARAM_MAX_SEGMENT_SIZE: | |
ec98ea70 | 3678 | len = sysfs_emit(buf, "%u\n", conn->max_segment_size); |
f8525eb4 AC |
3679 | break; |
3680 | case ISCSI_PARAM_KEEPALIVE_TMO: | |
ec98ea70 | 3681 | len = sysfs_emit(buf, "%u\n", conn->keepalive_tmo); |
f8525eb4 AC |
3682 | break; |
3683 | case ISCSI_PARAM_LOCAL_PORT: | |
ec98ea70 | 3684 | len = sysfs_emit(buf, "%u\n", conn->local_port); |
f8525eb4 AC |
3685 | break; |
3686 | case ISCSI_PARAM_TCP_TIMESTAMP_STAT: | |
ec98ea70 | 3687 | len = sysfs_emit(buf, "%u\n", conn->tcp_timestamp_stat); |
f8525eb4 AC |
3688 | break; |
3689 | case ISCSI_PARAM_TCP_NAGLE_DISABLE: | |
ec98ea70 | 3690 | len = sysfs_emit(buf, "%u\n", conn->tcp_nagle_disable); |
f8525eb4 AC |
3691 | break; |
3692 | case ISCSI_PARAM_TCP_WSF_DISABLE: | |
ec98ea70 | 3693 | len = sysfs_emit(buf, "%u\n", conn->tcp_wsf_disable); |
f8525eb4 AC |
3694 | break; |
3695 | case ISCSI_PARAM_TCP_TIMER_SCALE: | |
ec98ea70 | 3696 | len = sysfs_emit(buf, "%u\n", conn->tcp_timer_scale); |
f8525eb4 AC |
3697 | break; |
3698 | case ISCSI_PARAM_TCP_TIMESTAMP_EN: | |
ec98ea70 | 3699 | len = sysfs_emit(buf, "%u\n", conn->tcp_timestamp_en); |
f8525eb4 AC |
3700 | break; |
3701 | case ISCSI_PARAM_IP_FRAGMENT_DISABLE: | |
ec98ea70 | 3702 | len = sysfs_emit(buf, "%u\n", conn->fragment_disable); |
f8525eb4 AC |
3703 | break; |
3704 | case ISCSI_PARAM_IPV4_TOS: | |
ec98ea70 | 3705 | len = sysfs_emit(buf, "%u\n", conn->ipv4_tos); |
f8525eb4 AC |
3706 | break; |
3707 | case ISCSI_PARAM_IPV6_TC: | |
ec98ea70 | 3708 | len = sysfs_emit(buf, "%u\n", conn->ipv6_traffic_class); |
f8525eb4 | 3709 | break; |
5f09e1f3 | 3710 | case ISCSI_PARAM_IPV6_FLOW_LABEL: |
ec98ea70 | 3711 | len = sysfs_emit(buf, "%u\n", conn->ipv6_flow_label); |
5f09e1f3 | 3712 | break; |
f8525eb4 | 3713 | case ISCSI_PARAM_IS_FW_ASSIGNED_IPV6: |
ec98ea70 | 3714 | len = sysfs_emit(buf, "%u\n", conn->is_fw_assigned_ipv6); |
f8525eb4 AC |
3715 | break; |
3716 | case ISCSI_PARAM_TCP_XMIT_WSF: | |
ec98ea70 | 3717 | len = sysfs_emit(buf, "%u\n", conn->tcp_xmit_wsf); |
f8525eb4 AC |
3718 | break; |
3719 | case ISCSI_PARAM_TCP_RECV_WSF: | |
ec98ea70 | 3720 | len = sysfs_emit(buf, "%u\n", conn->tcp_recv_wsf); |
f8525eb4 | 3721 | break; |
ae56ff40 | 3722 | case ISCSI_PARAM_LOCAL_IPADDR: |
ec98ea70 | 3723 | len = sysfs_emit(buf, "%s\n", conn->local_ipaddr); |
ae56ff40 | 3724 | break; |
a54a52ca MC |
3725 | default: |
3726 | return -ENOSYS; | |
3727 | } | |
3728 | ||
3729 | return len; | |
3730 | } | |
3731 | EXPORT_SYMBOL_GPL(iscsi_conn_get_param); | |
3732 | ||
0801c242 MC |
3733 | int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param, |
3734 | char *buf) | |
3735 | { | |
75613521 | 3736 | struct iscsi_host *ihost = shost_priv(shost); |
0801c242 MC |
3737 | int len; |
3738 | ||
3739 | switch (param) { | |
d8196ed2 | 3740 | case ISCSI_HOST_PARAM_NETDEV_NAME: |
ec98ea70 | 3741 | len = sysfs_emit(buf, "%s\n", ihost->netdev); |
d8196ed2 | 3742 | break; |
0801c242 | 3743 | case ISCSI_HOST_PARAM_HWADDRESS: |
ec98ea70 | 3744 | len = sysfs_emit(buf, "%s\n", ihost->hwaddress); |
0801c242 | 3745 | break; |
8ad5781a | 3746 | case ISCSI_HOST_PARAM_INITIATOR_NAME: |
ec98ea70 | 3747 | len = sysfs_emit(buf, "%s\n", ihost->initiatorname); |
8ad5781a | 3748 | break; |
0801c242 MC |
3749 | default: |
3750 | return -ENOSYS; | |
3751 | } | |
3752 | ||
3753 | return len; | |
3754 | } | |
3755 | EXPORT_SYMBOL_GPL(iscsi_host_get_param); | |
3756 | ||
3757 | int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param, | |
3758 | char *buf, int buflen) | |
3759 | { | |
75613521 | 3760 | struct iscsi_host *ihost = shost_priv(shost); |
0801c242 MC |
3761 | |
3762 | switch (param) { | |
d8196ed2 | 3763 | case ISCSI_HOST_PARAM_NETDEV_NAME: |
5700b1af | 3764 | return iscsi_switch_str_param(&ihost->netdev, buf); |
0801c242 | 3765 | case ISCSI_HOST_PARAM_HWADDRESS: |
5700b1af | 3766 | return iscsi_switch_str_param(&ihost->hwaddress, buf); |
8ad5781a | 3767 | case ISCSI_HOST_PARAM_INITIATOR_NAME: |
5700b1af | 3768 | return iscsi_switch_str_param(&ihost->initiatorname, buf); |
0801c242 MC |
3769 | default: |
3770 | return -ENOSYS; | |
3771 | } | |
3772 | ||
3773 | return 0; | |
3774 | } | |
3775 | EXPORT_SYMBOL_GPL(iscsi_host_set_param); | |
3776 | ||
7996a778 MC |
3777 | MODULE_AUTHOR("Mike Christie"); |
3778 | MODULE_DESCRIPTION("iSCSI library functions"); | |
3779 | MODULE_LICENSE("GPL"); |