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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; | |
3fe5ae8b MC |
251 | /* fall through */ |
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 | |
6f8830f5 CL |
526 | spin_lock_bh(&conn->taskqueuelock); |
527 | if (!list_empty(&task->running)) { | |
528 | pr_debug_once("%s while task on list", __func__); | |
3bbaaad9 | 529 | list_del_init(&task->running); |
6f8830f5 CL |
530 | } |
531 | spin_unlock_bh(&conn->taskqueuelock); | |
3bbaaad9 MC |
532 | |
533 | if (conn->task == task) | |
534 | conn->task = NULL; | |
535 | ||
536 | if (conn->ping_task == task) | |
537 | conn->ping_task = NULL; | |
538 | ||
539 | /* release get from queueing */ | |
540 | __iscsi_put_task(task); | |
541 | } | |
542 | ||
4c0ba5d2 MC |
543 | /** |
544 | * iscsi_complete_scsi_task - finish scsi task normally | |
545 | * @task: iscsi task for scsi cmd | |
546 | * @exp_cmdsn: expected cmd sn in cpu format | |
547 | * @max_cmdsn: max cmd sn in cpu format | |
548 | * | |
549 | * This is used when drivers do not need or cannot perform | |
550 | * lower level pdu processing. | |
551 | * | |
659743b0 | 552 | * Called with session back_lock |
4c0ba5d2 MC |
553 | */ |
554 | void iscsi_complete_scsi_task(struct iscsi_task *task, | |
555 | uint32_t exp_cmdsn, uint32_t max_cmdsn) | |
556 | { | |
557 | struct iscsi_conn *conn = task->conn; | |
558 | ||
559 | ISCSI_DBG_SESSION(conn->session, "[itt 0x%x]\n", task->itt); | |
560 | ||
561 | conn->last_recv = jiffies; | |
562 | __iscsi_update_cmdsn(conn->session, exp_cmdsn, max_cmdsn); | |
563 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); | |
564 | } | |
565 | EXPORT_SYMBOL_GPL(iscsi_complete_scsi_task); | |
566 | ||
567 | ||
b3a7ea8d | 568 | /* |
659743b0 | 569 | * session back_lock must be held and if not called for a task that is |
3bbaaad9 MC |
570 | * still pending or from the xmit thread, then xmit thread must |
571 | * be suspended. | |
b3a7ea8d | 572 | */ |
3bbaaad9 | 573 | static void fail_scsi_task(struct iscsi_task *task, int err) |
b3a7ea8d | 574 | { |
3bbaaad9 | 575 | struct iscsi_conn *conn = task->conn; |
b3a7ea8d | 576 | struct scsi_cmnd *sc; |
b3cd5050 | 577 | int state; |
b3a7ea8d | 578 | |
3bbaaad9 MC |
579 | /* |
580 | * if a command completes and we get a successful tmf response | |
581 | * we will hit this because the scsi eh abort code does not take | |
582 | * a ref to the task. | |
583 | */ | |
9c19a7d0 | 584 | sc = task->sc; |
b3a7ea8d MC |
585 | if (!sc) |
586 | return; | |
587 | ||
b3cd5050 | 588 | if (task->state == ISCSI_TASK_PENDING) { |
b3a7ea8d MC |
589 | /* |
590 | * cmd never made it to the xmit thread, so we should not count | |
591 | * the cmd in the sequencing | |
592 | */ | |
593 | conn->session->queued_cmdsn--; | |
b3cd5050 MC |
594 | /* it was never sent so just complete like normal */ |
595 | state = ISCSI_TASK_COMPLETED; | |
596 | } else if (err == DID_TRANSPORT_DISRUPTED) | |
597 | state = ISCSI_TASK_ABRT_SESS_RECOV; | |
598 | else | |
599 | state = ISCSI_TASK_ABRT_TMF; | |
b3a7ea8d | 600 | |
b3cd5050 | 601 | sc->result = err << 16; |
ae3d56d8 | 602 | scsi_set_resid(sc, scsi_bufflen(sc)); |
3e5c28ad | 603 | |
659743b0 SP |
604 | /* regular RX path uses back_lock */ |
605 | spin_lock_bh(&conn->session->back_lock); | |
b3cd5050 | 606 | iscsi_complete_task(task, state); |
659743b0 | 607 | spin_unlock_bh(&conn->session->back_lock); |
b3a7ea8d MC |
608 | } |
609 | ||
3e5c28ad | 610 | static int iscsi_prep_mgmt_task(struct iscsi_conn *conn, |
9c19a7d0 | 611 | struct iscsi_task *task) |
052d0144 MC |
612 | { |
613 | struct iscsi_session *session = conn->session; | |
577577da | 614 | struct iscsi_hdr *hdr = task->hdr; |
052d0144 | 615 | struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr; |
4f704dc0 | 616 | uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK; |
052d0144 MC |
617 | |
618 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) | |
619 | return -ENOTCONN; | |
620 | ||
4f704dc0 | 621 | if (opcode != ISCSI_OP_LOGIN && opcode != ISCSI_OP_TEXT) |
052d0144 MC |
622 | nop->exp_statsn = cpu_to_be32(conn->exp_statsn); |
623 | /* | |
624 | * pre-format CmdSN for outgoing PDU. | |
625 | */ | |
626 | nop->cmdsn = cpu_to_be32(session->cmdsn); | |
627 | if (hdr->itt != RESERVED_ITT) { | |
052d0144 | 628 | /* |
4f704dc0 | 629 | * TODO: We always use immediate for normal session pdus. |
052d0144 MC |
630 | * If we start to send tmfs or nops as non-immediate then |
631 | * we should start checking the cmdsn numbers for mgmt tasks. | |
4f704dc0 MC |
632 | * |
633 | * During discovery sessions iscsid sends TEXT as non immediate, | |
634 | * but we always only send one PDU at a time. | |
052d0144 MC |
635 | */ |
636 | if (conn->c_stage == ISCSI_CONN_STARTED && | |
637 | !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { | |
638 | session->queued_cmdsn++; | |
639 | session->cmdsn++; | |
640 | } | |
641 | } | |
642 | ||
ae15f801 MC |
643 | if (session->tt->init_task && session->tt->init_task(task)) |
644 | return -EIO; | |
052d0144 MC |
645 | |
646 | if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT) | |
647 | session->state = ISCSI_STATE_LOGGING_OUT; | |
648 | ||
577577da | 649 | task->state = ISCSI_TASK_RUNNING; |
1b2c7af8 MC |
650 | ISCSI_DBG_SESSION(session, "mgmtpdu [op 0x%x hdr->itt 0x%x " |
651 | "datalen %d]\n", hdr->opcode & ISCSI_OPCODE_MASK, | |
652 | hdr->itt, task->data_count); | |
052d0144 MC |
653 | return 0; |
654 | } | |
655 | ||
9c19a7d0 | 656 | static struct iscsi_task * |
f6d5180c MC |
657 | __iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
658 | char *data, uint32_t data_size) | |
659 | { | |
660 | struct iscsi_session *session = conn->session; | |
1336aed1 | 661 | struct iscsi_host *ihost = shost_priv(session->host); |
4f704dc0 | 662 | uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK; |
9c19a7d0 | 663 | struct iscsi_task *task; |
262ef636 | 664 | itt_t itt; |
f6d5180c MC |
665 | |
666 | if (session->state == ISCSI_STATE_TERMINATE) | |
667 | return NULL; | |
668 | ||
4f704dc0 | 669 | if (opcode == ISCSI_OP_LOGIN || opcode == ISCSI_OP_TEXT) { |
f6d5180c MC |
670 | /* |
671 | * Login and Text are sent serially, in | |
672 | * request-followed-by-response sequence. | |
3e5c28ad MC |
673 | * Same task can be used. Same ITT must be used. |
674 | * Note that login_task is preallocated at conn_create(). | |
f6d5180c | 675 | */ |
4f704dc0 MC |
676 | if (conn->login_task->state != ISCSI_TASK_FREE) { |
677 | iscsi_conn_printk(KERN_ERR, conn, "Login/Text in " | |
678 | "progress. Cannot start new task.\n"); | |
679 | return NULL; | |
680 | } | |
681 | ||
cbaa4221 MC |
682 | if (data_size > ISCSI_DEF_MAX_RECV_SEG_LEN) { |
683 | 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); | |
684 | return NULL; | |
685 | } | |
686 | ||
9c19a7d0 | 687 | task = conn->login_task; |
4f704dc0 | 688 | } else { |
26013ad4 MC |
689 | if (session->state != ISCSI_STATE_LOGGED_IN) |
690 | return NULL; | |
691 | ||
cbaa4221 MC |
692 | if (data_size != 0) { |
693 | iscsi_conn_printk(KERN_ERR, conn, "Can not send data buffer of len %u for op 0x%x\n", data_size, opcode); | |
694 | return NULL; | |
695 | } | |
696 | ||
f6d5180c MC |
697 | BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE); |
698 | BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED); | |
699 | ||
7acd72eb | 700 | if (!kfifo_out(&session->cmdpool.queue, |
9c19a7d0 | 701 | (void*)&task, sizeof(void*))) |
f6d5180c MC |
702 | return NULL; |
703 | } | |
3e5c28ad MC |
704 | /* |
705 | * released in complete pdu for task we expect a response for, and | |
706 | * released by the lld when it has transmitted the task for | |
707 | * pdus we do not expect a response for. | |
708 | */ | |
6dc618cd | 709 | refcount_set(&task->refcount, 1); |
9c19a7d0 MC |
710 | task->conn = conn; |
711 | task->sc = NULL; | |
3bbaaad9 MC |
712 | INIT_LIST_HEAD(&task->running); |
713 | task->state = ISCSI_TASK_PENDING; | |
f6d5180c MC |
714 | |
715 | if (data_size) { | |
9c19a7d0 MC |
716 | memcpy(task->data, data, data_size); |
717 | task->data_count = data_size; | |
f6d5180c | 718 | } else |
9c19a7d0 | 719 | task->data_count = 0; |
f6d5180c | 720 | |
184b57c6 MC |
721 | if (conn->session->tt->alloc_pdu) { |
722 | if (conn->session->tt->alloc_pdu(task, hdr->opcode)) { | |
723 | iscsi_conn_printk(KERN_ERR, conn, "Could not allocate " | |
724 | "pdu for mgmt task.\n"); | |
3bbaaad9 | 725 | goto free_task; |
184b57c6 | 726 | } |
577577da | 727 | } |
184b57c6 | 728 | |
262ef636 | 729 | itt = task->hdr->itt; |
577577da | 730 | task->hdr_len = sizeof(struct iscsi_hdr); |
9c19a7d0 | 731 | memcpy(task->hdr, hdr, sizeof(struct iscsi_hdr)); |
262ef636 MC |
732 | |
733 | if (hdr->itt != RESERVED_ITT) { | |
734 | if (session->tt->parse_pdu_itt) | |
735 | task->hdr->itt = itt; | |
736 | else | |
737 | task->hdr->itt = build_itt(task->itt, | |
738 | task->conn->session->age); | |
739 | } | |
740 | ||
1336aed1 | 741 | if (!ihost->workq) { |
577577da MC |
742 | if (iscsi_prep_mgmt_task(conn, task)) |
743 | goto free_task; | |
052d0144 | 744 | |
9c19a7d0 | 745 | if (session->tt->xmit_task(task)) |
577577da | 746 | goto free_task; |
3bbaaad9 | 747 | } else { |
6f8830f5 | 748 | spin_lock_bh(&conn->taskqueuelock); |
3bbaaad9 | 749 | list_add_tail(&task->running, &conn->mgmtqueue); |
6f8830f5 | 750 | spin_unlock_bh(&conn->taskqueuelock); |
32ae763e | 751 | iscsi_conn_queue_work(conn); |
3bbaaad9 | 752 | } |
052d0144 | 753 | |
9c19a7d0 | 754 | return task; |
577577da MC |
755 | |
756 | free_task: | |
659743b0 | 757 | /* regular RX path uses back_lock */ |
4fa50799 | 758 | spin_lock(&session->back_lock); |
577577da | 759 | __iscsi_put_task(task); |
4fa50799 | 760 | spin_unlock(&session->back_lock); |
577577da | 761 | return NULL; |
f6d5180c MC |
762 | } |
763 | ||
764 | int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr, | |
765 | char *data, uint32_t data_size) | |
766 | { | |
767 | struct iscsi_conn *conn = cls_conn->dd_data; | |
768 | struct iscsi_session *session = conn->session; | |
769 | int err = 0; | |
770 | ||
659743b0 | 771 | spin_lock_bh(&session->frwd_lock); |
f6d5180c MC |
772 | if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size)) |
773 | err = -EPERM; | |
659743b0 | 774 | spin_unlock_bh(&session->frwd_lock); |
f6d5180c MC |
775 | return err; |
776 | } | |
777 | EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu); | |
778 | ||
7996a778 MC |
779 | /** |
780 | * iscsi_cmd_rsp - SCSI Command Response processing | |
781 | * @conn: iscsi connection | |
782 | * @hdr: iscsi header | |
9c19a7d0 | 783 | * @task: scsi command task |
7996a778 MC |
784 | * @data: cmd data buffer |
785 | * @datalen: len of buffer | |
786 | * | |
787 | * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and | |
a656183e | 788 | * then completes the command and task. called under back_lock |
7996a778 | 789 | **/ |
77a23c21 | 790 | static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
9c19a7d0 | 791 | struct iscsi_task *task, char *data, |
77a23c21 | 792 | int datalen) |
7996a778 | 793 | { |
12352183 | 794 | struct iscsi_scsi_rsp *rhdr = (struct iscsi_scsi_rsp *)hdr; |
7996a778 | 795 | struct iscsi_session *session = conn->session; |
9c19a7d0 | 796 | struct scsi_cmnd *sc = task->sc; |
7996a778 | 797 | |
77a23c21 | 798 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr); |
7996a778 MC |
799 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; |
800 | ||
801 | sc->result = (DID_OK << 16) | rhdr->cmd_status; | |
802 | ||
55e51eda SG |
803 | if (task->protected) { |
804 | sector_t sector; | |
805 | u8 ascq; | |
806 | ||
807 | /** | |
808 | * Transports that didn't implement check_protection | |
809 | * callback but still published T10-PI support to scsi-mid | |
810 | * deserve this BUG_ON. | |
811 | **/ | |
812 | BUG_ON(!session->tt->check_protection); | |
813 | ||
814 | ascq = session->tt->check_protection(task, §or); | |
815 | if (ascq) { | |
816 | sc->result = DRIVER_SENSE << 24 | | |
817 | SAM_STAT_CHECK_CONDITION; | |
818 | scsi_build_sense_buffer(1, sc->sense_buffer, | |
819 | ILLEGAL_REQUEST, 0x10, ascq); | |
a73c2a2f SG |
820 | scsi_set_sense_information(sc->sense_buffer, |
821 | SCSI_SENSE_BUFFERSIZE, | |
822 | sector); | |
55e51eda SG |
823 | goto out; |
824 | } | |
825 | } | |
826 | ||
7996a778 MC |
827 | if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) { |
828 | sc->result = DID_ERROR << 16; | |
829 | goto out; | |
830 | } | |
831 | ||
832 | if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) { | |
9b80cb4b | 833 | uint16_t senselen; |
7996a778 MC |
834 | |
835 | if (datalen < 2) { | |
836 | invalid_datalen: | |
322d739d MC |
837 | iscsi_conn_printk(KERN_ERR, conn, |
838 | "Got CHECK_CONDITION but invalid data " | |
839 | "buffer size of %d\n", datalen); | |
7996a778 MC |
840 | sc->result = DID_BAD_TARGET << 16; |
841 | goto out; | |
842 | } | |
843 | ||
8f333991 | 844 | senselen = get_unaligned_be16(data); |
7996a778 MC |
845 | if (datalen < senselen) |
846 | goto invalid_datalen; | |
847 | ||
848 | memcpy(sc->sense_buffer, data + 2, | |
9b80cb4b | 849 | min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE)); |
1b2c7af8 MC |
850 | ISCSI_DBG_SESSION(session, "copied %d bytes of sense\n", |
851 | min_t(uint16_t, senselen, | |
852 | SCSI_SENSE_BUFFERSIZE)); | |
7996a778 MC |
853 | } |
854 | ||
c07d4444 BH |
855 | if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW | |
856 | ISCSI_FLAG_CMD_BIDI_OVERFLOW)) { | |
ae3d56d8 | 857 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; |
c07d4444 BH |
858 | } |
859 | ||
7207fea4 BH |
860 | if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW | |
861 | ISCSI_FLAG_CMD_OVERFLOW)) { | |
7996a778 MC |
862 | int res_count = be32_to_cpu(rhdr->residual_count); |
863 | ||
7207fea4 BH |
864 | if (res_count > 0 && |
865 | (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || | |
866 | res_count <= scsi_bufflen(sc))) | |
c07d4444 | 867 | /* write side for bidi or uni-io set_resid */ |
1c138991 | 868 | scsi_set_resid(sc, res_count); |
7996a778 MC |
869 | else |
870 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
c07d4444 | 871 | } |
7996a778 | 872 | out: |
3bbaaad9 | 873 | ISCSI_DBG_SESSION(session, "cmd rsp done [sc %p res %d itt 0x%x]\n", |
1b2c7af8 | 874 | sc, sc->result, task->itt); |
7996a778 | 875 | conn->scsirsp_pdus_cnt++; |
b3cd5050 | 876 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); |
7996a778 MC |
877 | } |
878 | ||
1d9edf02 MC |
879 | /** |
880 | * iscsi_data_in_rsp - SCSI Data-In Response processing | |
881 | * @conn: iscsi connection | |
882 | * @hdr: iscsi pdu | |
883 | * @task: scsi command task | |
a656183e LD |
884 | * |
885 | * iscsi_data_in_rsp sets up the scsi_cmnd fields based on the data received | |
886 | * then completes the command and task. called under back_lock | |
1d9edf02 MC |
887 | **/ |
888 | static void | |
889 | iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
890 | struct iscsi_task *task) | |
891 | { | |
892 | struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)hdr; | |
893 | struct scsi_cmnd *sc = task->sc; | |
894 | ||
895 | if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS)) | |
896 | return; | |
897 | ||
edbc9aa0 | 898 | iscsi_update_cmdsn(conn->session, (struct iscsi_nopin *)hdr); |
1d9edf02 MC |
899 | sc->result = (DID_OK << 16) | rhdr->cmd_status; |
900 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; | |
901 | if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW | | |
902 | ISCSI_FLAG_DATA_OVERFLOW)) { | |
903 | int res_count = be32_to_cpu(rhdr->residual_count); | |
904 | ||
905 | if (res_count > 0 && | |
906 | (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || | |
ae3d56d8 | 907 | res_count <= sc->sdb.length)) |
960bf87a | 908 | scsi_set_resid(sc, res_count); |
1d9edf02 MC |
909 | else |
910 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
911 | } | |
912 | ||
3bbaaad9 MC |
913 | ISCSI_DBG_SESSION(conn->session, "data in with status done " |
914 | "[sc %p res %d itt 0x%x]\n", | |
915 | sc, sc->result, task->itt); | |
1d9edf02 | 916 | conn->scsirsp_pdus_cnt++; |
b3cd5050 | 917 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); |
1d9edf02 MC |
918 | } |
919 | ||
7ea8b828 MC |
920 | static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr) |
921 | { | |
922 | struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr; | |
923 | ||
924 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
925 | conn->tmfrsp_pdus_cnt++; | |
926 | ||
843c0a8a | 927 | if (conn->tmf_state != TMF_QUEUED) |
7ea8b828 MC |
928 | return; |
929 | ||
930 | if (tmf->response == ISCSI_TMF_RSP_COMPLETE) | |
843c0a8a | 931 | conn->tmf_state = TMF_SUCCESS; |
7ea8b828 | 932 | else if (tmf->response == ISCSI_TMF_RSP_NO_TASK) |
843c0a8a | 933 | conn->tmf_state = TMF_NOT_FOUND; |
7ea8b828 | 934 | else |
843c0a8a | 935 | conn->tmf_state = TMF_FAILED; |
7ea8b828 MC |
936 | wake_up(&conn->ehwait); |
937 | } | |
938 | ||
52f5664a | 939 | static int iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr) |
f6d5180c MC |
940 | { |
941 | struct iscsi_nopout hdr; | |
9c19a7d0 | 942 | struct iscsi_task *task; |
f6d5180c | 943 | |
9c19a7d0 | 944 | if (!rhdr && conn->ping_task) |
52f5664a | 945 | return -EINVAL; |
f6d5180c MC |
946 | |
947 | memset(&hdr, 0, sizeof(struct iscsi_nopout)); | |
948 | hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE; | |
949 | hdr.flags = ISCSI_FLAG_CMD_FINAL; | |
950 | ||
951 | if (rhdr) { | |
55bdabdf | 952 | hdr.lun = rhdr->lun; |
f6d5180c MC |
953 | hdr.ttt = rhdr->ttt; |
954 | hdr.itt = RESERVED_ITT; | |
955 | } else | |
956 | hdr.ttt = RESERVED_ITT; | |
957 | ||
9c19a7d0 | 958 | task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0); |
52f5664a | 959 | if (!task) { |
322d739d | 960 | iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n"); |
52f5664a AN |
961 | return -EIO; |
962 | } else if (!rhdr) { | |
d3acf022 MC |
963 | /* only track our nops */ |
964 | conn->ping_task = task; | |
965 | conn->last_ping = jiffies; | |
966 | } | |
52f5664a AN |
967 | |
968 | return 0; | |
f6d5180c MC |
969 | } |
970 | ||
a656183e LD |
971 | /** |
972 | * iscsi_nop_out_rsp - SCSI NOP Response processing | |
973 | * @task: scsi command task | |
974 | * @nop: the nop structure | |
975 | * @data: where to put the data | |
976 | * @datalen: length of data | |
977 | * | |
978 | * iscsi_nop_out_rsp handles nop response from use or | |
979 | * from user space. called under back_lock | |
980 | **/ | |
8afa1439 MC |
981 | static int iscsi_nop_out_rsp(struct iscsi_task *task, |
982 | struct iscsi_nopin *nop, char *data, int datalen) | |
983 | { | |
984 | struct iscsi_conn *conn = task->conn; | |
985 | int rc = 0; | |
986 | ||
987 | if (conn->ping_task != task) { | |
988 | /* | |
989 | * If this is not in response to one of our | |
990 | * nops then it must be from userspace. | |
991 | */ | |
992 | if (iscsi_recv_pdu(conn->cls_conn, (struct iscsi_hdr *)nop, | |
993 | data, datalen)) | |
994 | rc = ISCSI_ERR_CONN_FAILED; | |
995 | } else | |
996 | mod_timer(&conn->transport_timer, jiffies + conn->recv_timeout); | |
997 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); | |
998 | return rc; | |
999 | } | |
1000 | ||
62f38300 MC |
1001 | static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
1002 | char *data, int datalen) | |
1003 | { | |
1004 | struct iscsi_reject *reject = (struct iscsi_reject *)hdr; | |
1005 | struct iscsi_hdr rejected_pdu; | |
8afa1439 | 1006 | int opcode, rc = 0; |
62f38300 MC |
1007 | |
1008 | conn->exp_statsn = be32_to_cpu(reject->statsn) + 1; | |
1009 | ||
8afa1439 MC |
1010 | if (ntoh24(reject->dlength) > datalen || |
1011 | ntoh24(reject->dlength) < sizeof(struct iscsi_hdr)) { | |
1012 | iscsi_conn_printk(KERN_ERR, conn, "Cannot handle rejected " | |
1013 | "pdu. Invalid data length (pdu dlength " | |
1014 | "%u, datalen %d\n", ntoh24(reject->dlength), | |
1015 | datalen); | |
1016 | return ISCSI_ERR_PROTO; | |
1017 | } | |
1018 | memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr)); | |
1019 | opcode = rejected_pdu.opcode & ISCSI_OPCODE_MASK; | |
1020 | ||
1021 | switch (reject->reason) { | |
1022 | case ISCSI_REASON_DATA_DIGEST_ERROR: | |
1023 | iscsi_conn_printk(KERN_ERR, conn, | |
1024 | "pdu (op 0x%x itt 0x%x) rejected " | |
1025 | "due to DataDigest error.\n", | |
e5dbbe27 | 1026 | opcode, rejected_pdu.itt); |
8afa1439 MC |
1027 | break; |
1028 | case ISCSI_REASON_IMM_CMD_REJECT: | |
1029 | iscsi_conn_printk(KERN_ERR, conn, | |
1030 | "pdu (op 0x%x itt 0x%x) rejected. Too many " | |
1031 | "immediate commands.\n", | |
e5dbbe27 | 1032 | opcode, rejected_pdu.itt); |
8afa1439 MC |
1033 | /* |
1034 | * We only send one TMF at a time so if the target could not | |
1035 | * handle it, then it should get fixed (RFC mandates that | |
1036 | * a target can handle one immediate TMF per conn). | |
1037 | * | |
1038 | * For nops-outs, we could have sent more than one if | |
1039 | * the target is sending us lots of nop-ins | |
1040 | */ | |
1041 | if (opcode != ISCSI_OP_NOOP_OUT) | |
1042 | return 0; | |
62f38300 | 1043 | |
4dec6a8f | 1044 | if (rejected_pdu.itt == cpu_to_be32(ISCSI_RESERVED_TAG)) { |
8afa1439 MC |
1045 | /* |
1046 | * nop-out in response to target's nop-out rejected. | |
1047 | * Just resend. | |
1048 | */ | |
659743b0 SP |
1049 | /* In RX path we are under back lock */ |
1050 | spin_unlock(&conn->session->back_lock); | |
1051 | spin_lock(&conn->session->frwd_lock); | |
8afa1439 MC |
1052 | iscsi_send_nopout(conn, |
1053 | (struct iscsi_nopin*)&rejected_pdu); | |
659743b0 SP |
1054 | spin_unlock(&conn->session->frwd_lock); |
1055 | spin_lock(&conn->session->back_lock); | |
1056 | } else { | |
8afa1439 MC |
1057 | struct iscsi_task *task; |
1058 | /* | |
1059 | * Our nop as ping got dropped. We know the target | |
1060 | * and transport are ok so just clean up | |
1061 | */ | |
1062 | task = iscsi_itt_to_task(conn, rejected_pdu.itt); | |
1063 | if (!task) { | |
1064 | iscsi_conn_printk(KERN_ERR, conn, | |
1065 | "Invalid pdu reject. Could " | |
1066 | "not lookup rejected task.\n"); | |
1067 | rc = ISCSI_ERR_BAD_ITT; | |
1068 | } else | |
1069 | rc = iscsi_nop_out_rsp(task, | |
1070 | (struct iscsi_nopin*)&rejected_pdu, | |
1071 | NULL, 0); | |
62f38300 | 1072 | } |
8afa1439 MC |
1073 | break; |
1074 | default: | |
1075 | iscsi_conn_printk(KERN_ERR, conn, | |
1076 | "pdu (op 0x%x itt 0x%x) rejected. Reason " | |
e5dbbe27 VC |
1077 | "code 0x%x\n", rejected_pdu.opcode, |
1078 | rejected_pdu.itt, reject->reason); | |
8afa1439 | 1079 | break; |
62f38300 | 1080 | } |
8afa1439 | 1081 | return rc; |
62f38300 MC |
1082 | } |
1083 | ||
913e5bf4 MC |
1084 | /** |
1085 | * iscsi_itt_to_task - look up task by itt | |
1086 | * @conn: iscsi connection | |
1087 | * @itt: itt | |
1088 | * | |
1089 | * This should be used for mgmt tasks like login and nops, or if | |
1090 | * the LDD's itt space does not include the session age. | |
1091 | * | |
659743b0 | 1092 | * The session back_lock must be held. |
913e5bf4 | 1093 | */ |
8f9256ce | 1094 | struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *conn, itt_t itt) |
913e5bf4 MC |
1095 | { |
1096 | struct iscsi_session *session = conn->session; | |
262ef636 | 1097 | int i; |
913e5bf4 MC |
1098 | |
1099 | if (itt == RESERVED_ITT) | |
1100 | return NULL; | |
1101 | ||
262ef636 MC |
1102 | if (session->tt->parse_pdu_itt) |
1103 | session->tt->parse_pdu_itt(conn, itt, &i, NULL); | |
1104 | else | |
1105 | i = get_itt(itt); | |
913e5bf4 MC |
1106 | if (i >= session->cmds_max) |
1107 | return NULL; | |
1108 | ||
1109 | return session->cmds[i]; | |
1110 | } | |
8f9256ce | 1111 | EXPORT_SYMBOL_GPL(iscsi_itt_to_task); |
913e5bf4 | 1112 | |
7996a778 MC |
1113 | /** |
1114 | * __iscsi_complete_pdu - complete pdu | |
1115 | * @conn: iscsi conn | |
1116 | * @hdr: iscsi header | |
1117 | * @data: data buffer | |
1118 | * @datalen: len of data buffer | |
1119 | * | |
1120 | * Completes pdu processing by freeing any resources allocated at | |
659743b0 | 1121 | * queuecommand or send generic. session back_lock must be held and verify |
7996a778 MC |
1122 | * itt must have been called. |
1123 | */ | |
913e5bf4 MC |
1124 | int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
1125 | char *data, int datalen) | |
7996a778 MC |
1126 | { |
1127 | struct iscsi_session *session = conn->session; | |
1128 | int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0; | |
9c19a7d0 | 1129 | struct iscsi_task *task; |
7996a778 MC |
1130 | uint32_t itt; |
1131 | ||
f6d5180c | 1132 | conn->last_recv = jiffies; |
0af967f5 MC |
1133 | rc = iscsi_verify_itt(conn, hdr->itt); |
1134 | if (rc) | |
1135 | return rc; | |
1136 | ||
b4377356 AV |
1137 | if (hdr->itt != RESERVED_ITT) |
1138 | itt = get_itt(hdr->itt); | |
7996a778 | 1139 | else |
b4377356 | 1140 | itt = ~0U; |
7996a778 | 1141 | |
1b2c7af8 MC |
1142 | ISCSI_DBG_SESSION(session, "[op 0x%x cid %d itt 0x%x len %d]\n", |
1143 | opcode, conn->id, itt, datalen); | |
7996a778 | 1144 | |
3e5c28ad | 1145 | if (itt == ~0U) { |
77a23c21 | 1146 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); |
62f38300 | 1147 | |
7996a778 MC |
1148 | switch(opcode) { |
1149 | case ISCSI_OP_NOOP_IN: | |
40527afe | 1150 | if (datalen) { |
7996a778 | 1151 | rc = ISCSI_ERR_PROTO; |
40527afe MC |
1152 | break; |
1153 | } | |
1154 | ||
b4377356 | 1155 | if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG)) |
40527afe MC |
1156 | break; |
1157 | ||
659743b0 SP |
1158 | /* In RX path we are under back lock */ |
1159 | spin_unlock(&session->back_lock); | |
1160 | spin_lock(&session->frwd_lock); | |
f6d5180c | 1161 | iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr); |
659743b0 SP |
1162 | spin_unlock(&session->frwd_lock); |
1163 | spin_lock(&session->back_lock); | |
7996a778 MC |
1164 | break; |
1165 | case ISCSI_OP_REJECT: | |
62f38300 MC |
1166 | rc = iscsi_handle_reject(conn, hdr, data, datalen); |
1167 | break; | |
7996a778 | 1168 | case ISCSI_OP_ASYNC_EVENT: |
8d2860b3 | 1169 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; |
5831c737 MC |
1170 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) |
1171 | rc = ISCSI_ERR_CONN_FAILED; | |
7996a778 MC |
1172 | break; |
1173 | default: | |
1174 | rc = ISCSI_ERR_BAD_OPCODE; | |
1175 | break; | |
1176 | } | |
3e5c28ad MC |
1177 | goto out; |
1178 | } | |
1179 | ||
3e5c28ad MC |
1180 | switch(opcode) { |
1181 | case ISCSI_OP_SCSI_CMD_RSP: | |
913e5bf4 MC |
1182 | case ISCSI_OP_SCSI_DATA_IN: |
1183 | task = iscsi_itt_to_ctask(conn, hdr->itt); | |
1184 | if (!task) | |
1185 | return ISCSI_ERR_BAD_ITT; | |
d355e57d | 1186 | task->last_xfer = jiffies; |
913e5bf4 MC |
1187 | break; |
1188 | case ISCSI_OP_R2T: | |
1189 | /* | |
1190 | * LLD handles R2Ts if they need to. | |
1191 | */ | |
1192 | return 0; | |
1193 | case ISCSI_OP_LOGOUT_RSP: | |
1194 | case ISCSI_OP_LOGIN_RSP: | |
1195 | case ISCSI_OP_TEXT_RSP: | |
1196 | case ISCSI_OP_SCSI_TMFUNC_RSP: | |
1197 | case ISCSI_OP_NOOP_IN: | |
1198 | task = iscsi_itt_to_task(conn, hdr->itt); | |
1199 | if (!task) | |
1200 | return ISCSI_ERR_BAD_ITT; | |
1201 | break; | |
1202 | default: | |
1203 | return ISCSI_ERR_BAD_OPCODE; | |
1204 | } | |
1205 | ||
1206 | switch(opcode) { | |
1207 | case ISCSI_OP_SCSI_CMD_RSP: | |
9c19a7d0 | 1208 | iscsi_scsi_cmd_rsp(conn, hdr, task, data, datalen); |
3e5c28ad MC |
1209 | break; |
1210 | case ISCSI_OP_SCSI_DATA_IN: | |
1d9edf02 | 1211 | iscsi_data_in_rsp(conn, hdr, task); |
3e5c28ad | 1212 | break; |
3e5c28ad MC |
1213 | case ISCSI_OP_LOGOUT_RSP: |
1214 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
1215 | if (datalen) { | |
1216 | rc = ISCSI_ERR_PROTO; | |
1217 | break; | |
1218 | } | |
1219 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
1220 | goto recv_pdu; | |
1221 | case ISCSI_OP_LOGIN_RSP: | |
1222 | case ISCSI_OP_TEXT_RSP: | |
1223 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
1224 | /* | |
1225 | * login related PDU's exp_statsn is handled in | |
1226 | * userspace | |
1227 | */ | |
1228 | goto recv_pdu; | |
1229 | case ISCSI_OP_SCSI_TMFUNC_RSP: | |
1230 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
1231 | if (datalen) { | |
1232 | rc = ISCSI_ERR_PROTO; | |
1233 | break; | |
1234 | } | |
1235 | ||
1236 | iscsi_tmf_rsp(conn, hdr); | |
b3cd5050 | 1237 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); |
3e5c28ad MC |
1238 | break; |
1239 | case ISCSI_OP_NOOP_IN: | |
1240 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
1241 | if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) { | |
1242 | rc = ISCSI_ERR_PROTO; | |
1243 | break; | |
1244 | } | |
1245 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
1246 | ||
8afa1439 MC |
1247 | rc = iscsi_nop_out_rsp(task, (struct iscsi_nopin*)hdr, |
1248 | data, datalen); | |
3e5c28ad MC |
1249 | break; |
1250 | default: | |
1251 | rc = ISCSI_ERR_BAD_OPCODE; | |
1252 | break; | |
1253 | } | |
7996a778 | 1254 | |
3e5c28ad MC |
1255 | out: |
1256 | return rc; | |
1257 | recv_pdu: | |
1258 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) | |
1259 | rc = ISCSI_ERR_CONN_FAILED; | |
b3cd5050 | 1260 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); |
7996a778 MC |
1261 | return rc; |
1262 | } | |
913e5bf4 | 1263 | EXPORT_SYMBOL_GPL(__iscsi_complete_pdu); |
7996a778 MC |
1264 | |
1265 | int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
1266 | char *data, int datalen) | |
1267 | { | |
1268 | int rc; | |
1269 | ||
659743b0 | 1270 | spin_lock(&conn->session->back_lock); |
7996a778 | 1271 | rc = __iscsi_complete_pdu(conn, hdr, data, datalen); |
659743b0 | 1272 | spin_unlock(&conn->session->back_lock); |
7996a778 MC |
1273 | return rc; |
1274 | } | |
1275 | EXPORT_SYMBOL_GPL(iscsi_complete_pdu); | |
1276 | ||
0af967f5 | 1277 | int iscsi_verify_itt(struct iscsi_conn *conn, itt_t itt) |
7996a778 MC |
1278 | { |
1279 | struct iscsi_session *session = conn->session; | |
262ef636 | 1280 | int age = 0, i = 0; |
7996a778 | 1281 | |
0af967f5 MC |
1282 | if (itt == RESERVED_ITT) |
1283 | return 0; | |
7996a778 | 1284 | |
262ef636 MC |
1285 | if (session->tt->parse_pdu_itt) |
1286 | session->tt->parse_pdu_itt(conn, itt, &i, &age); | |
1287 | else { | |
1288 | i = get_itt(itt); | |
1289 | age = ((__force u32)itt >> ISCSI_AGE_SHIFT) & ISCSI_AGE_MASK; | |
1290 | } | |
1291 | ||
1292 | if (age != session->age) { | |
0af967f5 MC |
1293 | iscsi_conn_printk(KERN_ERR, conn, |
1294 | "received itt %x expected session age (%x)\n", | |
913e5bf4 | 1295 | (__force u32)itt, session->age); |
0af967f5 MC |
1296 | return ISCSI_ERR_BAD_ITT; |
1297 | } | |
7996a778 | 1298 | |
3e5c28ad MC |
1299 | if (i >= session->cmds_max) { |
1300 | iscsi_conn_printk(KERN_ERR, conn, | |
1301 | "received invalid itt index %u (max cmds " | |
1302 | "%u.\n", i, session->cmds_max); | |
1303 | return ISCSI_ERR_BAD_ITT; | |
7996a778 | 1304 | } |
7996a778 MC |
1305 | return 0; |
1306 | } | |
1307 | EXPORT_SYMBOL_GPL(iscsi_verify_itt); | |
1308 | ||
913e5bf4 MC |
1309 | /** |
1310 | * iscsi_itt_to_ctask - look up ctask by itt | |
1311 | * @conn: iscsi connection | |
1312 | * @itt: itt | |
1313 | * | |
1314 | * This should be used for cmd tasks. | |
1315 | * | |
659743b0 | 1316 | * The session back_lock must be held. |
913e5bf4 MC |
1317 | */ |
1318 | struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *conn, itt_t itt) | |
0af967f5 | 1319 | { |
9c19a7d0 | 1320 | struct iscsi_task *task; |
0af967f5 MC |
1321 | |
1322 | if (iscsi_verify_itt(conn, itt)) | |
1323 | return NULL; | |
1324 | ||
913e5bf4 MC |
1325 | task = iscsi_itt_to_task(conn, itt); |
1326 | if (!task || !task->sc) | |
0af967f5 MC |
1327 | return NULL; |
1328 | ||
913e5bf4 MC |
1329 | if (task->sc->SCp.phase != conn->session->age) { |
1330 | iscsi_session_printk(KERN_ERR, conn->session, | |
1331 | "task's session age %d, expected %d\n", | |
1332 | task->sc->SCp.phase, conn->session->age); | |
0af967f5 | 1333 | return NULL; |
913e5bf4 | 1334 | } |
0af967f5 | 1335 | |
9c19a7d0 | 1336 | return task; |
0af967f5 MC |
1337 | } |
1338 | EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask); | |
1339 | ||
40a06e75 | 1340 | void iscsi_session_failure(struct iscsi_session *session, |
e5bd7b54 MC |
1341 | enum iscsi_err err) |
1342 | { | |
e5bd7b54 MC |
1343 | struct iscsi_conn *conn; |
1344 | struct device *dev; | |
e5bd7b54 | 1345 | |
659743b0 | 1346 | spin_lock_bh(&session->frwd_lock); |
e5bd7b54 MC |
1347 | conn = session->leadconn; |
1348 | if (session->state == ISCSI_STATE_TERMINATE || !conn) { | |
659743b0 | 1349 | spin_unlock_bh(&session->frwd_lock); |
e5bd7b54 MC |
1350 | return; |
1351 | } | |
1352 | ||
1353 | dev = get_device(&conn->cls_conn->dev); | |
659743b0 | 1354 | spin_unlock_bh(&session->frwd_lock); |
e5bd7b54 MC |
1355 | if (!dev) |
1356 | return; | |
1357 | /* | |
1358 | * if the host is being removed bypass the connection | |
1359 | * recovery initialization because we are going to kill | |
1360 | * the session. | |
1361 | */ | |
1362 | if (err == ISCSI_ERR_INVALID_HOST) | |
1363 | iscsi_conn_error_event(conn->cls_conn, err); | |
1364 | else | |
1365 | iscsi_conn_failure(conn, err); | |
1366 | put_device(dev); | |
1367 | } | |
1368 | EXPORT_SYMBOL_GPL(iscsi_session_failure); | |
1369 | ||
7996a778 MC |
1370 | void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err) |
1371 | { | |
1372 | struct iscsi_session *session = conn->session; | |
7996a778 | 1373 | |
659743b0 | 1374 | spin_lock_bh(&session->frwd_lock); |
656cffc9 | 1375 | if (session->state == ISCSI_STATE_FAILED) { |
659743b0 | 1376 | spin_unlock_bh(&session->frwd_lock); |
656cffc9 MC |
1377 | return; |
1378 | } | |
1379 | ||
67a61114 | 1380 | if (conn->stop_stage == 0) |
7996a778 | 1381 | session->state = ISCSI_STATE_FAILED; |
659743b0 | 1382 | spin_unlock_bh(&session->frwd_lock); |
e5bd7b54 | 1383 | |
7996a778 MC |
1384 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); |
1385 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
e5bd7b54 | 1386 | iscsi_conn_error_event(conn->cls_conn, err); |
7996a778 MC |
1387 | } |
1388 | EXPORT_SYMBOL_GPL(iscsi_conn_failure); | |
1389 | ||
77a23c21 MC |
1390 | static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn) |
1391 | { | |
1392 | struct iscsi_session *session = conn->session; | |
1393 | ||
1394 | /* | |
1395 | * Check for iSCSI window and take care of CmdSN wrap-around | |
1396 | */ | |
e0726407 | 1397 | if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) { |
1b2c7af8 MC |
1398 | ISCSI_DBG_SESSION(session, "iSCSI CmdSN closed. ExpCmdSn " |
1399 | "%u MaxCmdSN %u CmdSN %u/%u\n", | |
1400 | session->exp_cmdsn, session->max_cmdsn, | |
1401 | session->cmdsn, session->queued_cmdsn); | |
77a23c21 MC |
1402 | return -ENOSPC; |
1403 | } | |
1404 | return 0; | |
1405 | } | |
1406 | ||
9c19a7d0 | 1407 | static int iscsi_xmit_task(struct iscsi_conn *conn) |
77a23c21 | 1408 | { |
9c19a7d0 | 1409 | struct iscsi_task *task = conn->task; |
843c0a8a | 1410 | int rc; |
77a23c21 | 1411 | |
70b31c15 MC |
1412 | if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) |
1413 | return -ENODATA; | |
1414 | ||
79edd00d AS |
1415 | spin_lock_bh(&conn->session->back_lock); |
1416 | if (conn->task == NULL) { | |
1417 | spin_unlock_bh(&conn->session->back_lock); | |
1418 | return -ENODATA; | |
1419 | } | |
9c19a7d0 | 1420 | __iscsi_get_task(task); |
79edd00d | 1421 | spin_unlock_bh(&conn->session->back_lock); |
659743b0 | 1422 | spin_unlock_bh(&conn->session->frwd_lock); |
9c19a7d0 | 1423 | rc = conn->session->tt->xmit_task(task); |
659743b0 | 1424 | spin_lock_bh(&conn->session->frwd_lock); |
d355e57d | 1425 | if (!rc) { |
9c19a7d0 | 1426 | /* done with this task */ |
d355e57d | 1427 | task->last_xfer = jiffies; |
9c19a7d0 | 1428 | conn->task = NULL; |
d355e57d | 1429 | } |
659743b0 | 1430 | /* regular RX path uses back_lock */ |
72b97402 | 1431 | spin_lock(&conn->session->back_lock); |
d355e57d | 1432 | __iscsi_put_task(task); |
72b97402 | 1433 | spin_unlock(&conn->session->back_lock); |
77a23c21 MC |
1434 | return rc; |
1435 | } | |
1436 | ||
843c0a8a | 1437 | /** |
9c19a7d0 MC |
1438 | * iscsi_requeue_task - requeue task to run from session workqueue |
1439 | * @task: task to requeue | |
843c0a8a | 1440 | * |
9c19a7d0 | 1441 | * LLDs that need to run a task from the session workqueue should call |
659743b0 | 1442 | * this. The session frwd_lock must be held. This should only be called |
052d0144 | 1443 | * by software drivers. |
843c0a8a | 1444 | */ |
9c19a7d0 | 1445 | void iscsi_requeue_task(struct iscsi_task *task) |
843c0a8a | 1446 | { |
9c19a7d0 | 1447 | struct iscsi_conn *conn = task->conn; |
843c0a8a | 1448 | |
3bbaaad9 MC |
1449 | /* |
1450 | * this may be on the requeue list already if the xmit_task callout | |
1451 | * is handling the r2ts while we are adding new ones | |
1452 | */ | |
6f8830f5 | 1453 | spin_lock_bh(&conn->taskqueuelock); |
3bbaaad9 MC |
1454 | if (list_empty(&task->running)) |
1455 | list_add_tail(&task->running, &conn->requeue); | |
6f8830f5 | 1456 | spin_unlock_bh(&conn->taskqueuelock); |
32ae763e | 1457 | iscsi_conn_queue_work(conn); |
843c0a8a | 1458 | } |
9c19a7d0 | 1459 | EXPORT_SYMBOL_GPL(iscsi_requeue_task); |
843c0a8a | 1460 | |
7996a778 MC |
1461 | /** |
1462 | * iscsi_data_xmit - xmit any command into the scheduled connection | |
1463 | * @conn: iscsi connection | |
1464 | * | |
1465 | * Notes: | |
1466 | * The function can return -EAGAIN in which case the caller must | |
1467 | * re-schedule it again later or recover. '0' return code means | |
1468 | * successful xmit. | |
1469 | **/ | |
1470 | static int iscsi_data_xmit(struct iscsi_conn *conn) | |
1471 | { | |
5d12c05e | 1472 | struct iscsi_task *task; |
3219e529 | 1473 | int rc = 0; |
7996a778 | 1474 | |
659743b0 | 1475 | spin_lock_bh(&conn->session->frwd_lock); |
70b31c15 | 1476 | if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) { |
1b2c7af8 | 1477 | ISCSI_DBG_SESSION(conn->session, "Tx suspended!\n"); |
659743b0 | 1478 | spin_unlock_bh(&conn->session->frwd_lock); |
3219e529 | 1479 | return -ENODATA; |
7996a778 | 1480 | } |
7996a778 | 1481 | |
9c19a7d0 MC |
1482 | if (conn->task) { |
1483 | rc = iscsi_xmit_task(conn); | |
3219e529 | 1484 | if (rc) |
70b31c15 | 1485 | goto done; |
7996a778 MC |
1486 | } |
1487 | ||
77a23c21 MC |
1488 | /* |
1489 | * process mgmt pdus like nops before commands since we should | |
1490 | * only have one nop-out as a ping from us and targets should not | |
1491 | * overflow us with nop-ins | |
1492 | */ | |
6f8830f5 | 1493 | spin_lock_bh(&conn->taskqueuelock); |
77a23c21 | 1494 | check_mgmt: |
843c0a8a | 1495 | while (!list_empty(&conn->mgmtqueue)) { |
9c19a7d0 MC |
1496 | conn->task = list_entry(conn->mgmtqueue.next, |
1497 | struct iscsi_task, running); | |
3bbaaad9 | 1498 | list_del_init(&conn->task->running); |
6f8830f5 | 1499 | spin_unlock_bh(&conn->taskqueuelock); |
9c19a7d0 | 1500 | if (iscsi_prep_mgmt_task(conn, conn->task)) { |
659743b0 SP |
1501 | /* regular RX path uses back_lock */ |
1502 | spin_lock_bh(&conn->session->back_lock); | |
9c19a7d0 | 1503 | __iscsi_put_task(conn->task); |
659743b0 | 1504 | spin_unlock_bh(&conn->session->back_lock); |
9c19a7d0 | 1505 | conn->task = NULL; |
6f8830f5 | 1506 | spin_lock_bh(&conn->taskqueuelock); |
b3a7ea8d MC |
1507 | continue; |
1508 | } | |
9c19a7d0 | 1509 | rc = iscsi_xmit_task(conn); |
77a23c21 | 1510 | if (rc) |
70b31c15 | 1511 | goto done; |
6f8830f5 | 1512 | spin_lock_bh(&conn->taskqueuelock); |
7996a778 MC |
1513 | } |
1514 | ||
843c0a8a | 1515 | /* process pending command queue */ |
3bbaaad9 | 1516 | while (!list_empty(&conn->cmdqueue)) { |
5d12c05e MC |
1517 | conn->task = list_entry(conn->cmdqueue.next, struct iscsi_task, |
1518 | running); | |
3bbaaad9 | 1519 | list_del_init(&conn->task->running); |
6f8830f5 | 1520 | spin_unlock_bh(&conn->taskqueuelock); |
b3a7ea8d | 1521 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) { |
b3cd5050 | 1522 | fail_scsi_task(conn->task, DID_IMM_RETRY); |
6f8830f5 | 1523 | spin_lock_bh(&conn->taskqueuelock); |
b3a7ea8d MC |
1524 | continue; |
1525 | } | |
577577da MC |
1526 | rc = iscsi_prep_scsi_cmd_pdu(conn->task); |
1527 | if (rc) { | |
5d12c05e | 1528 | if (rc == -ENOMEM || rc == -EACCES) { |
6f8830f5 | 1529 | spin_lock_bh(&conn->taskqueuelock); |
3bbaaad9 MC |
1530 | list_add_tail(&conn->task->running, |
1531 | &conn->cmdqueue); | |
577577da | 1532 | conn->task = NULL; |
6f8830f5 | 1533 | spin_unlock_bh(&conn->taskqueuelock); |
70b31c15 | 1534 | goto done; |
577577da | 1535 | } else |
b3cd5050 | 1536 | fail_scsi_task(conn->task, DID_ABORT); |
6f8830f5 | 1537 | spin_lock_bh(&conn->taskqueuelock); |
004d6530 BH |
1538 | continue; |
1539 | } | |
9c19a7d0 | 1540 | rc = iscsi_xmit_task(conn); |
77a23c21 | 1541 | if (rc) |
70b31c15 | 1542 | goto done; |
77a23c21 | 1543 | /* |
9c19a7d0 | 1544 | * we could continuously get new task requests so |
77a23c21 MC |
1545 | * we need to check the mgmt queue for nops that need to |
1546 | * be sent to aviod starvation | |
1547 | */ | |
6f8830f5 | 1548 | spin_lock_bh(&conn->taskqueuelock); |
843c0a8a MC |
1549 | if (!list_empty(&conn->mgmtqueue)) |
1550 | goto check_mgmt; | |
1551 | } | |
1552 | ||
1553 | while (!list_empty(&conn->requeue)) { | |
b3a7ea8d MC |
1554 | /* |
1555 | * we always do fastlogout - conn stop code will clean up. | |
1556 | */ | |
1557 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) | |
1558 | break; | |
1559 | ||
5d12c05e MC |
1560 | task = list_entry(conn->requeue.next, struct iscsi_task, |
1561 | running); | |
1562 | if (iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_DATA_OUT)) | |
1563 | break; | |
1564 | ||
1565 | conn->task = task; | |
3bbaaad9 | 1566 | list_del_init(&conn->task->running); |
9c19a7d0 | 1567 | conn->task->state = ISCSI_TASK_RUNNING; |
6f8830f5 | 1568 | spin_unlock_bh(&conn->taskqueuelock); |
9c19a7d0 | 1569 | rc = iscsi_xmit_task(conn); |
843c0a8a | 1570 | if (rc) |
70b31c15 | 1571 | goto done; |
6f8830f5 | 1572 | spin_lock_bh(&conn->taskqueuelock); |
843c0a8a | 1573 | if (!list_empty(&conn->mgmtqueue)) |
77a23c21 | 1574 | goto check_mgmt; |
7996a778 | 1575 | } |
6f8830f5 | 1576 | spin_unlock_bh(&conn->taskqueuelock); |
659743b0 | 1577 | spin_unlock_bh(&conn->session->frwd_lock); |
3219e529 | 1578 | return -ENODATA; |
7996a778 | 1579 | |
70b31c15 | 1580 | done: |
659743b0 | 1581 | spin_unlock_bh(&conn->session->frwd_lock); |
3219e529 | 1582 | return rc; |
7996a778 MC |
1583 | } |
1584 | ||
c4028958 | 1585 | static void iscsi_xmitworker(struct work_struct *work) |
7996a778 | 1586 | { |
c4028958 DH |
1587 | struct iscsi_conn *conn = |
1588 | container_of(work, struct iscsi_conn, xmitwork); | |
3219e529 | 1589 | int rc; |
7996a778 MC |
1590 | /* |
1591 | * serialize Xmit worker on a per-connection basis. | |
1592 | */ | |
3219e529 MC |
1593 | do { |
1594 | rc = iscsi_data_xmit(conn); | |
1595 | } while (rc >= 0 || rc == -EAGAIN); | |
7996a778 MC |
1596 | } |
1597 | ||
577577da MC |
1598 | static inline struct iscsi_task *iscsi_alloc_task(struct iscsi_conn *conn, |
1599 | struct scsi_cmnd *sc) | |
1600 | { | |
1601 | struct iscsi_task *task; | |
1602 | ||
7acd72eb | 1603 | if (!kfifo_out(&conn->session->cmdpool.queue, |
577577da MC |
1604 | (void *) &task, sizeof(void *))) |
1605 | return NULL; | |
1606 | ||
1607 | sc->SCp.phase = conn->session->age; | |
1608 | sc->SCp.ptr = (char *) task; | |
1609 | ||
6dc618cd | 1610 | refcount_set(&task->refcount, 1); |
577577da MC |
1611 | task->state = ISCSI_TASK_PENDING; |
1612 | task->conn = conn; | |
1613 | task->sc = sc; | |
d355e57d MC |
1614 | task->have_checked_conn = false; |
1615 | task->last_timeout = jiffies; | |
1616 | task->last_xfer = jiffies; | |
55e51eda | 1617 | task->protected = false; |
577577da MC |
1618 | INIT_LIST_HEAD(&task->running); |
1619 | return task; | |
1620 | } | |
1621 | ||
7996a778 MC |
1622 | enum { |
1623 | FAILURE_BAD_HOST = 1, | |
1624 | FAILURE_SESSION_FAILED, | |
1625 | FAILURE_SESSION_FREED, | |
1626 | FAILURE_WINDOW_CLOSED, | |
60ecebf5 | 1627 | FAILURE_OOM, |
7996a778 | 1628 | FAILURE_SESSION_TERMINATE, |
656cffc9 | 1629 | FAILURE_SESSION_IN_RECOVERY, |
7996a778 | 1630 | FAILURE_SESSION_RECOVERY_TIMEOUT, |
b3a7ea8d | 1631 | FAILURE_SESSION_LOGGING_OUT, |
6eabafbe | 1632 | FAILURE_SESSION_NOT_READY, |
7996a778 MC |
1633 | }; |
1634 | ||
f41d4721 | 1635 | int iscsi_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc) |
7996a778 | 1636 | { |
75613521 | 1637 | struct iscsi_cls_session *cls_session; |
1336aed1 | 1638 | struct iscsi_host *ihost; |
7996a778 MC |
1639 | int reason = 0; |
1640 | struct iscsi_session *session; | |
1641 | struct iscsi_conn *conn; | |
9c19a7d0 | 1642 | struct iscsi_task *task = NULL; |
7996a778 | 1643 | |
7996a778 | 1644 | sc->result = 0; |
f47f2cf5 | 1645 | sc->SCp.ptr = NULL; |
7996a778 | 1646 | |
1336aed1 | 1647 | ihost = shost_priv(host); |
7996a778 | 1648 | |
75613521 MC |
1649 | cls_session = starget_to_session(scsi_target(sc->device)); |
1650 | session = cls_session->dd_data; | |
659743b0 | 1651 | spin_lock_bh(&session->frwd_lock); |
7996a778 | 1652 | |
75613521 | 1653 | reason = iscsi_session_chkready(cls_session); |
6eabafbe MC |
1654 | if (reason) { |
1655 | sc->result = reason; | |
1656 | goto fault; | |
1657 | } | |
1658 | ||
301e0f7e | 1659 | if (session->state != ISCSI_STATE_LOGGED_IN) { |
656cffc9 MC |
1660 | /* |
1661 | * to handle the race between when we set the recovery state | |
1662 | * and block the session we requeue here (commands could | |
1663 | * be entering our queuecommand while a block is starting | |
1664 | * up because the block code is not locked) | |
1665 | */ | |
9000bcd6 | 1666 | switch (session->state) { |
301e0f7e | 1667 | case ISCSI_STATE_FAILED: |
d7549412 RDT |
1668 | /* |
1669 | * cmds should fail during shutdown, if the session | |
1670 | * state is bad, allowing completion to happen | |
1671 | */ | |
1672 | if (unlikely(system_state != SYSTEM_RUNNING)) { | |
1673 | reason = FAILURE_SESSION_FAILED; | |
1674 | sc->result = DID_NO_CONNECT << 16; | |
1675 | break; | |
1676 | } | |
807cf197 | 1677 | /* fall through */ |
9000bcd6 | 1678 | case ISCSI_STATE_IN_RECOVERY: |
656cffc9 | 1679 | reason = FAILURE_SESSION_IN_RECOVERY; |
301e0f7e MC |
1680 | sc->result = DID_IMM_RETRY << 16; |
1681 | break; | |
9000bcd6 MC |
1682 | case ISCSI_STATE_LOGGING_OUT: |
1683 | reason = FAILURE_SESSION_LOGGING_OUT; | |
301e0f7e MC |
1684 | sc->result = DID_IMM_RETRY << 16; |
1685 | break; | |
b3a7ea8d | 1686 | case ISCSI_STATE_RECOVERY_FAILED: |
656cffc9 | 1687 | reason = FAILURE_SESSION_RECOVERY_TIMEOUT; |
56d7fcfa | 1688 | sc->result = DID_TRANSPORT_FAILFAST << 16; |
b3a7ea8d MC |
1689 | break; |
1690 | case ISCSI_STATE_TERMINATE: | |
656cffc9 | 1691 | reason = FAILURE_SESSION_TERMINATE; |
6eabafbe | 1692 | sc->result = DID_NO_CONNECT << 16; |
b3a7ea8d | 1693 | break; |
b3a7ea8d | 1694 | default: |
656cffc9 | 1695 | reason = FAILURE_SESSION_FREED; |
6eabafbe | 1696 | sc->result = DID_NO_CONNECT << 16; |
b3a7ea8d | 1697 | } |
7996a778 MC |
1698 | goto fault; |
1699 | } | |
1700 | ||
7996a778 | 1701 | conn = session->leadconn; |
98644047 MC |
1702 | if (!conn) { |
1703 | reason = FAILURE_SESSION_FREED; | |
6eabafbe | 1704 | sc->result = DID_NO_CONNECT << 16; |
98644047 MC |
1705 | goto fault; |
1706 | } | |
7996a778 | 1707 | |
661134ad MC |
1708 | if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) { |
1709 | reason = FAILURE_SESSION_IN_RECOVERY; | |
eef9ffdf | 1710 | sc->result = DID_REQUEUE << 16; |
661134ad MC |
1711 | goto fault; |
1712 | } | |
1713 | ||
77a23c21 MC |
1714 | if (iscsi_check_cmdsn_window_closed(conn)) { |
1715 | reason = FAILURE_WINDOW_CLOSED; | |
1716 | goto reject; | |
1717 | } | |
1718 | ||
577577da MC |
1719 | task = iscsi_alloc_task(conn, sc); |
1720 | if (!task) { | |
60ecebf5 MC |
1721 | reason = FAILURE_OOM; |
1722 | goto reject; | |
1723 | } | |
7996a778 | 1724 | |
1336aed1 | 1725 | if (!ihost->workq) { |
577577da MC |
1726 | reason = iscsi_prep_scsi_cmd_pdu(task); |
1727 | if (reason) { | |
5d12c05e | 1728 | if (reason == -ENOMEM || reason == -EACCES) { |
577577da MC |
1729 | reason = FAILURE_OOM; |
1730 | goto prepd_reject; | |
1731 | } else { | |
1732 | sc->result = DID_ABORT << 16; | |
1733 | goto prepd_fault; | |
1734 | } | |
052d0144 | 1735 | } |
9c19a7d0 | 1736 | if (session->tt->xmit_task(task)) { |
d3305f34 | 1737 | session->cmdsn--; |
052d0144 | 1738 | reason = FAILURE_SESSION_NOT_READY; |
577577da | 1739 | goto prepd_reject; |
052d0144 | 1740 | } |
3bbaaad9 | 1741 | } else { |
6f8830f5 | 1742 | spin_lock_bh(&conn->taskqueuelock); |
3bbaaad9 | 1743 | list_add_tail(&task->running, &conn->cmdqueue); |
6f8830f5 | 1744 | spin_unlock_bh(&conn->taskqueuelock); |
32ae763e | 1745 | iscsi_conn_queue_work(conn); |
3bbaaad9 | 1746 | } |
052d0144 MC |
1747 | |
1748 | session->queued_cmdsn++; | |
659743b0 | 1749 | spin_unlock_bh(&session->frwd_lock); |
7996a778 MC |
1750 | return 0; |
1751 | ||
577577da | 1752 | prepd_reject: |
a656183e | 1753 | spin_lock_bh(&session->back_lock); |
f41d4721 | 1754 | iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ); |
a656183e | 1755 | spin_unlock_bh(&session->back_lock); |
7996a778 | 1756 | reject: |
659743b0 | 1757 | spin_unlock_bh(&session->frwd_lock); |
1b2c7af8 MC |
1758 | ISCSI_DBG_SESSION(session, "cmd 0x%x rejected (%d)\n", |
1759 | sc->cmnd[0], reason); | |
d6d13ee1 | 1760 | return SCSI_MLQUEUE_TARGET_BUSY; |
7996a778 | 1761 | |
577577da | 1762 | prepd_fault: |
a656183e | 1763 | spin_lock_bh(&session->back_lock); |
f41d4721 | 1764 | iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ); |
a656183e | 1765 | spin_unlock_bh(&session->back_lock); |
7996a778 | 1766 | fault: |
659743b0 | 1767 | spin_unlock_bh(&session->frwd_lock); |
1b2c7af8 MC |
1768 | ISCSI_DBG_SESSION(session, "iscsi: cmd 0x%x is not queued (%d)\n", |
1769 | sc->cmnd[0], reason); | |
ae3d56d8 | 1770 | scsi_set_resid(sc, scsi_bufflen(sc)); |
f41d4721 | 1771 | sc->scsi_done(sc); |
7996a778 MC |
1772 | return 0; |
1773 | } | |
1774 | EXPORT_SYMBOL_GPL(iscsi_queuecommand); | |
1775 | ||
6b5d6c44 MC |
1776 | int iscsi_target_alloc(struct scsi_target *starget) |
1777 | { | |
1778 | struct iscsi_cls_session *cls_session = starget_to_session(starget); | |
1779 | struct iscsi_session *session = cls_session->dd_data; | |
1780 | ||
1781 | starget->can_queue = session->scsi_cmds_max; | |
1782 | return 0; | |
1783 | } | |
1784 | EXPORT_SYMBOL_GPL(iscsi_target_alloc); | |
1785 | ||
2c4b9637 | 1786 | static void iscsi_tmf_timedout(struct timer_list *t) |
7996a778 | 1787 | { |
2c4b9637 | 1788 | struct iscsi_conn *conn = from_timer(conn, t, tmf_timer); |
7996a778 MC |
1789 | struct iscsi_session *session = conn->session; |
1790 | ||
659743b0 | 1791 | spin_lock(&session->frwd_lock); |
843c0a8a MC |
1792 | if (conn->tmf_state == TMF_QUEUED) { |
1793 | conn->tmf_state = TMF_TIMEDOUT; | |
bd2199d4 | 1794 | ISCSI_DBG_EH(session, "tmf timedout\n"); |
7996a778 MC |
1795 | /* unblock eh_abort() */ |
1796 | wake_up(&conn->ehwait); | |
1797 | } | |
659743b0 | 1798 | spin_unlock(&session->frwd_lock); |
7996a778 MC |
1799 | } |
1800 | ||
9c19a7d0 | 1801 | static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn, |
f6d5180c MC |
1802 | struct iscsi_tm *hdr, int age, |
1803 | int timeout) | |
1360c58a | 1804 | __must_hold(&session->frwd_lock) |
7996a778 | 1805 | { |
7996a778 | 1806 | struct iscsi_session *session = conn->session; |
9c19a7d0 | 1807 | struct iscsi_task *task; |
7996a778 | 1808 | |
9c19a7d0 | 1809 | task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr, |
843c0a8a | 1810 | NULL, 0); |
9c19a7d0 | 1811 | if (!task) { |
659743b0 | 1812 | spin_unlock_bh(&session->frwd_lock); |
df4da5cd | 1813 | iscsi_conn_printk(KERN_ERR, conn, "Could not send TMF.\n"); |
7996a778 | 1814 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
659743b0 | 1815 | spin_lock_bh(&session->frwd_lock); |
77a23c21 | 1816 | return -EPERM; |
7996a778 | 1817 | } |
843c0a8a | 1818 | conn->tmfcmd_pdus_cnt++; |
f6d5180c | 1819 | conn->tmf_timer.expires = timeout * HZ + jiffies; |
843c0a8a | 1820 | add_timer(&conn->tmf_timer); |
bd2199d4 | 1821 | ISCSI_DBG_EH(session, "tmf set timeout\n"); |
7996a778 | 1822 | |
659743b0 | 1823 | spin_unlock_bh(&session->frwd_lock); |
6724add1 | 1824 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1825 | |
1826 | /* | |
1827 | * block eh thread until: | |
1828 | * | |
843c0a8a MC |
1829 | * 1) tmf response |
1830 | * 2) tmf timeout | |
7996a778 MC |
1831 | * 3) session is terminated or restarted or userspace has |
1832 | * given up on recovery | |
1833 | */ | |
843c0a8a | 1834 | wait_event_interruptible(conn->ehwait, age != session->age || |
7996a778 | 1835 | session->state != ISCSI_STATE_LOGGED_IN || |
843c0a8a | 1836 | conn->tmf_state != TMF_QUEUED); |
7996a778 MC |
1837 | if (signal_pending(current)) |
1838 | flush_signals(current); | |
843c0a8a MC |
1839 | del_timer_sync(&conn->tmf_timer); |
1840 | ||
6724add1 | 1841 | mutex_lock(&session->eh_mutex); |
659743b0 | 1842 | spin_lock_bh(&session->frwd_lock); |
9c19a7d0 | 1843 | /* if the session drops it will clean up the task */ |
843c0a8a MC |
1844 | if (age != session->age || |
1845 | session->state != ISCSI_STATE_LOGGED_IN) | |
1846 | return -ENOTCONN; | |
7996a778 MC |
1847 | return 0; |
1848 | } | |
1849 | ||
843c0a8a MC |
1850 | /* |
1851 | * Fail commands. session lock held and recv side suspended and xmit | |
1852 | * thread flushed | |
1853 | */ | |
9cb78c16 | 1854 | static void fail_scsi_tasks(struct iscsi_conn *conn, u64 lun, int error) |
843c0a8a | 1855 | { |
3bbaaad9 MC |
1856 | struct iscsi_task *task; |
1857 | int i; | |
843c0a8a | 1858 | |
3bbaaad9 MC |
1859 | for (i = 0; i < conn->session->cmds_max; i++) { |
1860 | task = conn->session->cmds[i]; | |
1861 | if (!task->sc || task->state == ISCSI_TASK_FREE) | |
1862 | continue; | |
843c0a8a | 1863 | |
3bbaaad9 MC |
1864 | if (lun != -1 && lun != task->sc->device->lun) |
1865 | continue; | |
843c0a8a | 1866 | |
3bbaaad9 MC |
1867 | ISCSI_DBG_SESSION(conn->session, |
1868 | "failing sc %p itt 0x%x state %d\n", | |
1869 | task->sc, task->itt, task->state); | |
b3cd5050 | 1870 | fail_scsi_task(task, error); |
843c0a8a MC |
1871 | } |
1872 | } | |
1873 | ||
661134ad MC |
1874 | /** |
1875 | * iscsi_suspend_queue - suspend iscsi_queuecommand | |
1876 | * @conn: iscsi conn to stop queueing IO on | |
1877 | * | |
659743b0 | 1878 | * This grabs the session frwd_lock to make sure no one is in |
661134ad MC |
1879 | * xmit_task/queuecommand, and then sets suspend to prevent |
1880 | * new commands from being queued. This only needs to be called | |
1881 | * by offload drivers that need to sync a path like ep disconnect | |
1882 | * with the iscsi_queuecommand/xmit_task. To start IO again libiscsi | |
1883 | * will call iscsi_start_tx and iscsi_unblock_session when in FFP. | |
1884 | */ | |
1885 | void iscsi_suspend_queue(struct iscsi_conn *conn) | |
1886 | { | |
659743b0 | 1887 | spin_lock_bh(&conn->session->frwd_lock); |
661134ad | 1888 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); |
659743b0 | 1889 | spin_unlock_bh(&conn->session->frwd_lock); |
661134ad MC |
1890 | } |
1891 | EXPORT_SYMBOL_GPL(iscsi_suspend_queue); | |
1892 | ||
1893 | /** | |
1894 | * iscsi_suspend_tx - suspend iscsi_data_xmit | |
1895 | * @conn: iscsi conn tp stop processing IO on. | |
1896 | * | |
1897 | * This function sets the suspend bit to prevent iscsi_data_xmit | |
1898 | * from sending new IO, and if work is queued on the xmit thread | |
1899 | * it will wait for it to be completed. | |
1900 | */ | |
b40977d9 | 1901 | void iscsi_suspend_tx(struct iscsi_conn *conn) |
6724add1 | 1902 | { |
32ae763e MC |
1903 | struct Scsi_Host *shost = conn->session->host; |
1904 | struct iscsi_host *ihost = shost_priv(shost); | |
1905 | ||
6724add1 | 1906 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); |
1336aed1 | 1907 | if (ihost->workq) |
32ae763e | 1908 | flush_workqueue(ihost->workq); |
6724add1 | 1909 | } |
b40977d9 | 1910 | EXPORT_SYMBOL_GPL(iscsi_suspend_tx); |
6724add1 MC |
1911 | |
1912 | static void iscsi_start_tx(struct iscsi_conn *conn) | |
1913 | { | |
1914 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
1336aed1 | 1915 | iscsi_conn_queue_work(conn); |
6724add1 MC |
1916 | } |
1917 | ||
4c48a829 MC |
1918 | /* |
1919 | * We want to make sure a ping is in flight. It has timed out. | |
1920 | * And we are not busy processing a pdu that is making | |
1921 | * progress but got started before the ping and is taking a while | |
1922 | * to complete so the ping is just stuck behind it in a queue. | |
1923 | */ | |
1924 | static int iscsi_has_ping_timed_out(struct iscsi_conn *conn) | |
1925 | { | |
1926 | if (conn->ping_task && | |
1927 | time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) + | |
1928 | (conn->ping_timeout * HZ), jiffies)) | |
1929 | return 1; | |
1930 | else | |
1931 | return 0; | |
1932 | } | |
1933 | ||
b6a05c82 | 1934 | enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *sc) |
f6d5180c | 1935 | { |
6600593c | 1936 | enum blk_eh_timer_return rc = BLK_EH_DONE; |
92ed4d69 | 1937 | struct iscsi_task *task = NULL, *running_task; |
f6d5180c MC |
1938 | struct iscsi_cls_session *cls_session; |
1939 | struct iscsi_session *session; | |
1940 | struct iscsi_conn *conn; | |
92ed4d69 | 1941 | int i; |
f6d5180c | 1942 | |
d355e57d | 1943 | cls_session = starget_to_session(scsi_target(sc->device)); |
75613521 | 1944 | session = cls_session->dd_data; |
f6d5180c | 1945 | |
bd2199d4 | 1946 | ISCSI_DBG_EH(session, "scsi cmd %p timedout\n", sc); |
f6d5180c | 1947 | |
659743b0 | 1948 | spin_lock(&session->frwd_lock); |
e3d338a5 MC |
1949 | task = (struct iscsi_task *)sc->SCp.ptr; |
1950 | if (!task) { | |
1951 | /* | |
1952 | * Raced with completion. Blk layer has taken ownership | |
1953 | * so let timeout code complete it now. | |
1954 | */ | |
adb2b769 | 1955 | rc = BLK_EH_DONE; |
e3d338a5 MC |
1956 | goto done; |
1957 | } | |
1958 | ||
f6d5180c | 1959 | if (session->state != ISCSI_STATE_LOGGED_IN) { |
d7549412 RDT |
1960 | /* |
1961 | * During shutdown, if session is prematurely disconnected, | |
1962 | * recovery won't happen and there will be hung cmds. Not | |
1963 | * handling cmds would trigger EH, also bad in this case. | |
1964 | * Instead, handle cmd, allow completion to happen and let | |
1965 | * upper layer to deal with the result. | |
1966 | */ | |
1967 | if (unlikely(system_state != SYSTEM_RUNNING)) { | |
1968 | sc->result = DID_NO_CONNECT << 16; | |
1969 | ISCSI_DBG_EH(session, "sc on shutdown, handled\n"); | |
adb2b769 | 1970 | rc = BLK_EH_DONE; |
d7549412 RDT |
1971 | goto done; |
1972 | } | |
f6d5180c MC |
1973 | /* |
1974 | * We are probably in the middle of iscsi recovery so let | |
1975 | * that complete and handle the error. | |
1976 | */ | |
242f9dcb | 1977 | rc = BLK_EH_RESET_TIMER; |
f6d5180c MC |
1978 | goto done; |
1979 | } | |
1980 | ||
1981 | conn = session->leadconn; | |
1982 | if (!conn) { | |
1983 | /* In the middle of shuting down */ | |
242f9dcb | 1984 | rc = BLK_EH_RESET_TIMER; |
f6d5180c MC |
1985 | goto done; |
1986 | } | |
1987 | ||
d355e57d MC |
1988 | /* |
1989 | * If we have sent (at least queued to the network layer) a pdu or | |
1990 | * recvd one for the task since the last timeout ask for | |
1991 | * more time. If on the next timeout we have not made progress | |
1992 | * we can check if it is the task or connection when we send the | |
1993 | * nop as a ping. | |
1994 | */ | |
92ed4d69 | 1995 | if (time_after(task->last_xfer, task->last_timeout)) { |
bd2199d4 EZ |
1996 | ISCSI_DBG_EH(session, "Command making progress. Asking " |
1997 | "scsi-ml for more time to complete. " | |
92ed4d69 | 1998 | "Last data xfer at %lu. Last timeout was at " |
bd2199d4 | 1999 | "%lu\n.", task->last_xfer, task->last_timeout); |
d355e57d MC |
2000 | task->have_checked_conn = false; |
2001 | rc = BLK_EH_RESET_TIMER; | |
2002 | goto done; | |
2003 | } | |
2004 | ||
f6d5180c MC |
2005 | if (!conn->recv_timeout && !conn->ping_timeout) |
2006 | goto done; | |
2007 | /* | |
2008 | * if the ping timedout then we are in the middle of cleaning up | |
2009 | * and can let the iscsi eh handle it | |
2010 | */ | |
4c48a829 | 2011 | if (iscsi_has_ping_timed_out(conn)) { |
242f9dcb | 2012 | rc = BLK_EH_RESET_TIMER; |
4c48a829 MC |
2013 | goto done; |
2014 | } | |
d355e57d | 2015 | |
92ed4d69 MC |
2016 | for (i = 0; i < conn->session->cmds_max; i++) { |
2017 | running_task = conn->session->cmds[i]; | |
2018 | if (!running_task->sc || running_task == task || | |
2019 | running_task->state != ISCSI_TASK_RUNNING) | |
2020 | continue; | |
2021 | ||
2022 | /* | |
2023 | * Only check if cmds started before this one have made | |
2024 | * progress, or this could never fail | |
2025 | */ | |
2026 | if (time_after(running_task->sc->jiffies_at_alloc, | |
2027 | task->sc->jiffies_at_alloc)) | |
2028 | continue; | |
2029 | ||
2030 | if (time_after(running_task->last_xfer, task->last_timeout)) { | |
2031 | /* | |
2032 | * This task has not made progress, but a task | |
2033 | * started before us has transferred data since | |
2034 | * we started/last-checked. We could be queueing | |
2035 | * too many tasks or the LU is bad. | |
2036 | * | |
2037 | * If the device is bad the cmds ahead of us on | |
2038 | * other devs will complete, and this loop will | |
2039 | * eventually fail starting the scsi eh. | |
2040 | */ | |
2041 | ISCSI_DBG_EH(session, "Command has not made progress " | |
2042 | "but commands ahead of it have. " | |
2043 | "Asking scsi-ml for more time to " | |
2044 | "complete. Our last xfer vs running task " | |
2045 | "last xfer %lu/%lu. Last check %lu.\n", | |
2046 | task->last_xfer, running_task->last_xfer, | |
2047 | task->last_timeout); | |
2048 | rc = BLK_EH_RESET_TIMER; | |
2049 | goto done; | |
2050 | } | |
2051 | } | |
2052 | ||
d355e57d MC |
2053 | /* Assumes nop timeout is shorter than scsi cmd timeout */ |
2054 | if (task->have_checked_conn) | |
2055 | goto done; | |
2056 | ||
f6d5180c | 2057 | /* |
d355e57d MC |
2058 | * Checking the transport already or nop from a cmd timeout still |
2059 | * running | |
f6d5180c | 2060 | */ |
d355e57d MC |
2061 | if (conn->ping_task) { |
2062 | task->have_checked_conn = true; | |
242f9dcb | 2063 | rc = BLK_EH_RESET_TIMER; |
4c48a829 MC |
2064 | goto done; |
2065 | } | |
2066 | ||
d355e57d MC |
2067 | /* Make sure there is a transport check done */ |
2068 | iscsi_send_nopout(conn, NULL); | |
2069 | task->have_checked_conn = true; | |
2070 | rc = BLK_EH_RESET_TIMER; | |
2071 | ||
f6d5180c | 2072 | done: |
d355e57d MC |
2073 | if (task) |
2074 | task->last_timeout = jiffies; | |
659743b0 | 2075 | spin_unlock(&session->frwd_lock); |
bd2199d4 | 2076 | ISCSI_DBG_EH(session, "return %s\n", rc == BLK_EH_RESET_TIMER ? |
d7549412 | 2077 | "timer reset" : "shutdown or nh"); |
f6d5180c MC |
2078 | return rc; |
2079 | } | |
b6a05c82 | 2080 | EXPORT_SYMBOL_GPL(iscsi_eh_cmd_timed_out); |
f6d5180c | 2081 | |
2c4b9637 | 2082 | static void iscsi_check_transport_timeouts(struct timer_list *t) |
f6d5180c | 2083 | { |
2c4b9637 | 2084 | struct iscsi_conn *conn = from_timer(conn, t, transport_timer); |
f6d5180c | 2085 | struct iscsi_session *session = conn->session; |
4cf10435 | 2086 | unsigned long recv_timeout, next_timeout = 0, last_recv; |
f6d5180c | 2087 | |
659743b0 | 2088 | spin_lock(&session->frwd_lock); |
f6d5180c MC |
2089 | if (session->state != ISCSI_STATE_LOGGED_IN) |
2090 | goto done; | |
2091 | ||
4cf10435 MC |
2092 | recv_timeout = conn->recv_timeout; |
2093 | if (!recv_timeout) | |
f6d5180c MC |
2094 | goto done; |
2095 | ||
4cf10435 | 2096 | recv_timeout *= HZ; |
f6d5180c | 2097 | last_recv = conn->last_recv; |
4c48a829 MC |
2098 | |
2099 | if (iscsi_has_ping_timed_out(conn)) { | |
322d739d | 2100 | iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs " |
4c48a829 MC |
2101 | "expired, recv timeout %d, last rx %lu, " |
2102 | "last ping %lu, now %lu\n", | |
2103 | conn->ping_timeout, conn->recv_timeout, | |
2104 | last_recv, conn->last_ping, jiffies); | |
659743b0 | 2105 | spin_unlock(&session->frwd_lock); |
09ff742c | 2106 | iscsi_conn_failure(conn, ISCSI_ERR_NOP_TIMEDOUT); |
f6d5180c MC |
2107 | return; |
2108 | } | |
2109 | ||
4cf10435 | 2110 | if (time_before_eq(last_recv + recv_timeout, jiffies)) { |
c8611f97 | 2111 | /* send a ping to try to provoke some traffic */ |
1b2c7af8 | 2112 | ISCSI_DBG_CONN(conn, "Sending nopout as ping\n"); |
52f5664a AN |
2113 | if (iscsi_send_nopout(conn, NULL)) |
2114 | next_timeout = jiffies + (1 * HZ); | |
2115 | else | |
2116 | next_timeout = conn->last_ping + (conn->ping_timeout * HZ); | |
ad294e9c | 2117 | } else |
4cf10435 | 2118 | next_timeout = last_recv + recv_timeout; |
f6d5180c | 2119 | |
1b2c7af8 | 2120 | ISCSI_DBG_CONN(conn, "Setting next tmo %lu\n", next_timeout); |
ad294e9c | 2121 | mod_timer(&conn->transport_timer, next_timeout); |
f6d5180c | 2122 | done: |
659743b0 | 2123 | spin_unlock(&session->frwd_lock); |
f6d5180c MC |
2124 | } |
2125 | ||
9c19a7d0 | 2126 | static void iscsi_prep_abort_task_pdu(struct iscsi_task *task, |
843c0a8a MC |
2127 | struct iscsi_tm *hdr) |
2128 | { | |
2129 | memset(hdr, 0, sizeof(*hdr)); | |
2130 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
2131 | hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK; | |
2132 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
55bdabdf | 2133 | hdr->lun = task->lun; |
577577da MC |
2134 | hdr->rtt = task->hdr_itt; |
2135 | hdr->refcmdsn = task->cmdsn; | |
843c0a8a MC |
2136 | } |
2137 | ||
7996a778 MC |
2138 | int iscsi_eh_abort(struct scsi_cmnd *sc) |
2139 | { | |
75613521 MC |
2140 | struct iscsi_cls_session *cls_session; |
2141 | struct iscsi_session *session; | |
f47f2cf5 | 2142 | struct iscsi_conn *conn; |
9c19a7d0 | 2143 | struct iscsi_task *task; |
843c0a8a | 2144 | struct iscsi_tm *hdr; |
e9e410e8 | 2145 | int age; |
7996a778 | 2146 | |
75613521 MC |
2147 | cls_session = starget_to_session(scsi_target(sc->device)); |
2148 | session = cls_session->dd_data; | |
2149 | ||
bd2199d4 | 2150 | ISCSI_DBG_EH(session, "aborting sc %p\n", sc); |
4421c9eb | 2151 | |
6724add1 | 2152 | mutex_lock(&session->eh_mutex); |
659743b0 | 2153 | spin_lock_bh(&session->frwd_lock); |
f47f2cf5 MC |
2154 | /* |
2155 | * if session was ISCSI_STATE_IN_RECOVERY then we may not have | |
2156 | * got the command. | |
2157 | */ | |
2158 | if (!sc->SCp.ptr) { | |
bd2199d4 EZ |
2159 | ISCSI_DBG_EH(session, "sc never reached iscsi layer or " |
2160 | "it completed.\n"); | |
659743b0 | 2161 | spin_unlock_bh(&session->frwd_lock); |
6724add1 | 2162 | mutex_unlock(&session->eh_mutex); |
f47f2cf5 MC |
2163 | return SUCCESS; |
2164 | } | |
2165 | ||
7996a778 MC |
2166 | /* |
2167 | * If we are not logged in or we have started a new session | |
2168 | * then let the host reset code handle this | |
2169 | */ | |
843c0a8a MC |
2170 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN || |
2171 | sc->SCp.phase != session->age) { | |
659743b0 | 2172 | spin_unlock_bh(&session->frwd_lock); |
843c0a8a | 2173 | mutex_unlock(&session->eh_mutex); |
bd2199d4 | 2174 | ISCSI_DBG_EH(session, "failing abort due to dropped " |
4421c9eb | 2175 | "session.\n"); |
843c0a8a MC |
2176 | return FAILED; |
2177 | } | |
2178 | ||
2179 | conn = session->leadconn; | |
2180 | conn->eh_abort_cnt++; | |
2181 | age = session->age; | |
2182 | ||
9c19a7d0 | 2183 | task = (struct iscsi_task *)sc->SCp.ptr; |
bd2199d4 EZ |
2184 | ISCSI_DBG_EH(session, "aborting [sc %p itt 0x%x]\n", |
2185 | sc, task->itt); | |
7996a778 | 2186 | |
9c19a7d0 MC |
2187 | /* task completed before time out */ |
2188 | if (!task->sc) { | |
bd2199d4 | 2189 | ISCSI_DBG_EH(session, "sc completed while abort in progress\n"); |
77a23c21 | 2190 | goto success; |
7ea8b828 | 2191 | } |
7996a778 | 2192 | |
9c19a7d0 | 2193 | if (task->state == ISCSI_TASK_PENDING) { |
b3cd5050 | 2194 | fail_scsi_task(task, DID_ABORT); |
77a23c21 MC |
2195 | goto success; |
2196 | } | |
7996a778 | 2197 | |
843c0a8a MC |
2198 | /* only have one tmf outstanding at a time */ |
2199 | if (conn->tmf_state != TMF_INITIAL) | |
7996a778 | 2200 | goto failed; |
843c0a8a | 2201 | conn->tmf_state = TMF_QUEUED; |
7996a778 | 2202 | |
843c0a8a | 2203 | hdr = &conn->tmhdr; |
9c19a7d0 | 2204 | iscsi_prep_abort_task_pdu(task, hdr); |
843c0a8a | 2205 | |
e9e410e8 | 2206 | if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout)) |
843c0a8a | 2207 | goto failed; |
843c0a8a MC |
2208 | |
2209 | switch (conn->tmf_state) { | |
2210 | case TMF_SUCCESS: | |
659743b0 | 2211 | spin_unlock_bh(&session->frwd_lock); |
913e5bf4 MC |
2212 | /* |
2213 | * stop tx side incase the target had sent a abort rsp but | |
2214 | * the initiator was still writing out data. | |
2215 | */ | |
6724add1 | 2216 | iscsi_suspend_tx(conn); |
77a23c21 | 2217 | /* |
913e5bf4 MC |
2218 | * we do not stop the recv side because targets have been |
2219 | * good and have never sent us a successful tmf response | |
2220 | * then sent more data for the cmd. | |
77a23c21 | 2221 | */ |
659743b0 | 2222 | spin_lock_bh(&session->frwd_lock); |
b3cd5050 | 2223 | fail_scsi_task(task, DID_ABORT); |
843c0a8a | 2224 | conn->tmf_state = TMF_INITIAL; |
5d12c05e | 2225 | memset(hdr, 0, sizeof(*hdr)); |
659743b0 | 2226 | spin_unlock_bh(&session->frwd_lock); |
6724add1 | 2227 | iscsi_start_tx(conn); |
77a23c21 | 2228 | goto success_unlocked; |
843c0a8a | 2229 | case TMF_TIMEDOUT: |
659743b0 | 2230 | spin_unlock_bh(&session->frwd_lock); |
df4da5cd | 2231 | iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); |
843c0a8a MC |
2232 | goto failed_unlocked; |
2233 | case TMF_NOT_FOUND: | |
2234 | if (!sc->SCp.ptr) { | |
2235 | conn->tmf_state = TMF_INITIAL; | |
5d12c05e | 2236 | memset(hdr, 0, sizeof(*hdr)); |
9c19a7d0 | 2237 | /* task completed before tmf abort response */ |
bd2199d4 EZ |
2238 | ISCSI_DBG_EH(session, "sc completed while abort in " |
2239 | "progress\n"); | |
77a23c21 | 2240 | goto success; |
7ea8b828 MC |
2241 | } |
2242 | /* fall through */ | |
2243 | default: | |
843c0a8a MC |
2244 | conn->tmf_state = TMF_INITIAL; |
2245 | goto failed; | |
7996a778 MC |
2246 | } |
2247 | ||
77a23c21 | 2248 | success: |
659743b0 | 2249 | spin_unlock_bh(&session->frwd_lock); |
77a23c21 | 2250 | success_unlocked: |
bd2199d4 EZ |
2251 | ISCSI_DBG_EH(session, "abort success [sc %p itt 0x%x]\n", |
2252 | sc, task->itt); | |
6724add1 | 2253 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
2254 | return SUCCESS; |
2255 | ||
2256 | failed: | |
659743b0 | 2257 | spin_unlock_bh(&session->frwd_lock); |
77a23c21 | 2258 | failed_unlocked: |
bd2199d4 EZ |
2259 | ISCSI_DBG_EH(session, "abort failed [sc %p itt 0x%x]\n", sc, |
2260 | task ? task->itt : 0); | |
6724add1 | 2261 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
2262 | return FAILED; |
2263 | } | |
2264 | EXPORT_SYMBOL_GPL(iscsi_eh_abort); | |
2265 | ||
843c0a8a MC |
2266 | static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr) |
2267 | { | |
2268 | memset(hdr, 0, sizeof(*hdr)); | |
2269 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
2270 | hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK; | |
2271 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
55bdabdf | 2272 | int_to_scsilun(sc->device->lun, &hdr->lun); |
f6d5180c | 2273 | hdr->rtt = RESERVED_ITT; |
843c0a8a MC |
2274 | } |
2275 | ||
2276 | int iscsi_eh_device_reset(struct scsi_cmnd *sc) | |
2277 | { | |
75613521 MC |
2278 | struct iscsi_cls_session *cls_session; |
2279 | struct iscsi_session *session; | |
843c0a8a MC |
2280 | struct iscsi_conn *conn; |
2281 | struct iscsi_tm *hdr; | |
2282 | int rc = FAILED; | |
2283 | ||
75613521 MC |
2284 | cls_session = starget_to_session(scsi_target(sc->device)); |
2285 | session = cls_session->dd_data; | |
2286 | ||
9cb78c16 HR |
2287 | ISCSI_DBG_EH(session, "LU Reset [sc %p lun %llu]\n", sc, |
2288 | sc->device->lun); | |
843c0a8a MC |
2289 | |
2290 | mutex_lock(&session->eh_mutex); | |
659743b0 | 2291 | spin_lock_bh(&session->frwd_lock); |
843c0a8a MC |
2292 | /* |
2293 | * Just check if we are not logged in. We cannot check for | |
2294 | * the phase because the reset could come from a ioctl. | |
2295 | */ | |
2296 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN) | |
2297 | goto unlock; | |
2298 | conn = session->leadconn; | |
2299 | ||
2300 | /* only have one tmf outstanding at a time */ | |
2301 | if (conn->tmf_state != TMF_INITIAL) | |
2302 | goto unlock; | |
2303 | conn->tmf_state = TMF_QUEUED; | |
2304 | ||
2305 | hdr = &conn->tmhdr; | |
2306 | iscsi_prep_lun_reset_pdu(sc, hdr); | |
2307 | ||
9c19a7d0 | 2308 | if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age, |
f6d5180c | 2309 | session->lu_reset_timeout)) { |
843c0a8a MC |
2310 | rc = FAILED; |
2311 | goto unlock; | |
2312 | } | |
2313 | ||
2314 | switch (conn->tmf_state) { | |
2315 | case TMF_SUCCESS: | |
2316 | break; | |
2317 | case TMF_TIMEDOUT: | |
659743b0 | 2318 | spin_unlock_bh(&session->frwd_lock); |
df4da5cd | 2319 | iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); |
843c0a8a MC |
2320 | goto done; |
2321 | default: | |
2322 | conn->tmf_state = TMF_INITIAL; | |
2323 | goto unlock; | |
2324 | } | |
2325 | ||
2326 | rc = SUCCESS; | |
659743b0 | 2327 | spin_unlock_bh(&session->frwd_lock); |
843c0a8a MC |
2328 | |
2329 | iscsi_suspend_tx(conn); | |
913e5bf4 | 2330 | |
659743b0 | 2331 | spin_lock_bh(&session->frwd_lock); |
5d12c05e | 2332 | memset(hdr, 0, sizeof(*hdr)); |
3bbaaad9 | 2333 | fail_scsi_tasks(conn, sc->device->lun, DID_ERROR); |
843c0a8a | 2334 | conn->tmf_state = TMF_INITIAL; |
659743b0 | 2335 | spin_unlock_bh(&session->frwd_lock); |
843c0a8a MC |
2336 | |
2337 | iscsi_start_tx(conn); | |
2338 | goto done; | |
2339 | ||
2340 | unlock: | |
659743b0 | 2341 | spin_unlock_bh(&session->frwd_lock); |
843c0a8a | 2342 | done: |
bd2199d4 EZ |
2343 | ISCSI_DBG_EH(session, "dev reset result = %s\n", |
2344 | rc == SUCCESS ? "SUCCESS" : "FAILED"); | |
843c0a8a MC |
2345 | mutex_unlock(&session->eh_mutex); |
2346 | return rc; | |
2347 | } | |
2348 | EXPORT_SYMBOL_GPL(iscsi_eh_device_reset); | |
2349 | ||
3fe5ae8b MC |
2350 | void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session) |
2351 | { | |
2352 | struct iscsi_session *session = cls_session->dd_data; | |
2353 | ||
659743b0 | 2354 | spin_lock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2355 | if (session->state != ISCSI_STATE_LOGGED_IN) { |
2356 | session->state = ISCSI_STATE_RECOVERY_FAILED; | |
2357 | if (session->leadconn) | |
2358 | wake_up(&session->leadconn->ehwait); | |
2359 | } | |
659743b0 | 2360 | spin_unlock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2361 | } |
2362 | EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout); | |
2363 | ||
2364 | /** | |
2365 | * iscsi_eh_session_reset - drop session and attempt relogin | |
2366 | * @sc: scsi command | |
2367 | * | |
2368 | * This function will wait for a relogin, session termination from | |
2369 | * userspace, or a recovery/replacement timeout. | |
2370 | */ | |
309ce156 | 2371 | int iscsi_eh_session_reset(struct scsi_cmnd *sc) |
3fe5ae8b MC |
2372 | { |
2373 | struct iscsi_cls_session *cls_session; | |
2374 | struct iscsi_session *session; | |
2375 | struct iscsi_conn *conn; | |
2376 | ||
2377 | cls_session = starget_to_session(scsi_target(sc->device)); | |
2378 | session = cls_session->dd_data; | |
2379 | conn = session->leadconn; | |
2380 | ||
2381 | mutex_lock(&session->eh_mutex); | |
659743b0 | 2382 | spin_lock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2383 | if (session->state == ISCSI_STATE_TERMINATE) { |
2384 | failed: | |
2385 | ISCSI_DBG_EH(session, | |
2386 | "failing session reset: Could not log back into " | |
5db6dd14 FH |
2387 | "%s [age %d]\n", session->targetname, |
2388 | session->age); | |
659743b0 | 2389 | spin_unlock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2390 | mutex_unlock(&session->eh_mutex); |
2391 | return FAILED; | |
2392 | } | |
2393 | ||
659743b0 | 2394 | spin_unlock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2395 | mutex_unlock(&session->eh_mutex); |
2396 | /* | |
2397 | * we drop the lock here but the leadconn cannot be destoyed while | |
2398 | * we are in the scsi eh | |
2399 | */ | |
df4da5cd | 2400 | iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); |
3fe5ae8b MC |
2401 | |
2402 | ISCSI_DBG_EH(session, "wait for relogin\n"); | |
2403 | wait_event_interruptible(conn->ehwait, | |
2404 | session->state == ISCSI_STATE_TERMINATE || | |
2405 | session->state == ISCSI_STATE_LOGGED_IN || | |
2406 | session->state == ISCSI_STATE_RECOVERY_FAILED); | |
2407 | if (signal_pending(current)) | |
2408 | flush_signals(current); | |
2409 | ||
2410 | mutex_lock(&session->eh_mutex); | |
659743b0 | 2411 | spin_lock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2412 | if (session->state == ISCSI_STATE_LOGGED_IN) { |
2413 | ISCSI_DBG_EH(session, | |
2414 | "session reset succeeded for %s,%s\n", | |
2415 | session->targetname, conn->persistent_address); | |
2416 | } else | |
2417 | goto failed; | |
659743b0 | 2418 | spin_unlock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2419 | mutex_unlock(&session->eh_mutex); |
2420 | return SUCCESS; | |
2421 | } | |
309ce156 | 2422 | EXPORT_SYMBOL_GPL(iscsi_eh_session_reset); |
3fe5ae8b MC |
2423 | |
2424 | static void iscsi_prep_tgt_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr) | |
2425 | { | |
2426 | memset(hdr, 0, sizeof(*hdr)); | |
2427 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
2428 | hdr->flags = ISCSI_TM_FUNC_TARGET_WARM_RESET & ISCSI_FLAG_TM_FUNC_MASK; | |
2429 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
2430 | hdr->rtt = RESERVED_ITT; | |
2431 | } | |
2432 | ||
2433 | /** | |
2434 | * iscsi_eh_target_reset - reset target | |
2435 | * @sc: scsi command | |
2436 | * | |
309ce156 | 2437 | * This will attempt to send a warm target reset. |
3fe5ae8b | 2438 | */ |
3907adf6 | 2439 | static int iscsi_eh_target_reset(struct scsi_cmnd *sc) |
3fe5ae8b MC |
2440 | { |
2441 | struct iscsi_cls_session *cls_session; | |
2442 | struct iscsi_session *session; | |
2443 | struct iscsi_conn *conn; | |
2444 | struct iscsi_tm *hdr; | |
2445 | int rc = FAILED; | |
2446 | ||
2447 | cls_session = starget_to_session(scsi_target(sc->device)); | |
2448 | session = cls_session->dd_data; | |
2449 | ||
2450 | ISCSI_DBG_EH(session, "tgt Reset [sc %p tgt %s]\n", sc, | |
2451 | session->targetname); | |
2452 | ||
2453 | mutex_lock(&session->eh_mutex); | |
659743b0 | 2454 | spin_lock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2455 | /* |
2456 | * Just check if we are not logged in. We cannot check for | |
2457 | * the phase because the reset could come from a ioctl. | |
2458 | */ | |
2459 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN) | |
2460 | goto unlock; | |
2461 | conn = session->leadconn; | |
2462 | ||
2463 | /* only have one tmf outstanding at a time */ | |
2464 | if (conn->tmf_state != TMF_INITIAL) | |
2465 | goto unlock; | |
2466 | conn->tmf_state = TMF_QUEUED; | |
2467 | ||
2468 | hdr = &conn->tmhdr; | |
2469 | iscsi_prep_tgt_reset_pdu(sc, hdr); | |
2470 | ||
2471 | if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age, | |
2472 | session->tgt_reset_timeout)) { | |
2473 | rc = FAILED; | |
2474 | goto unlock; | |
2475 | } | |
2476 | ||
2477 | switch (conn->tmf_state) { | |
2478 | case TMF_SUCCESS: | |
2479 | break; | |
2480 | case TMF_TIMEDOUT: | |
659743b0 | 2481 | spin_unlock_bh(&session->frwd_lock); |
df4da5cd | 2482 | iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); |
3fe5ae8b MC |
2483 | goto done; |
2484 | default: | |
2485 | conn->tmf_state = TMF_INITIAL; | |
2486 | goto unlock; | |
2487 | } | |
2488 | ||
2489 | rc = SUCCESS; | |
659743b0 | 2490 | spin_unlock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2491 | |
2492 | iscsi_suspend_tx(conn); | |
2493 | ||
659743b0 | 2494 | spin_lock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2495 | memset(hdr, 0, sizeof(*hdr)); |
2496 | fail_scsi_tasks(conn, -1, DID_ERROR); | |
2497 | conn->tmf_state = TMF_INITIAL; | |
659743b0 | 2498 | spin_unlock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2499 | |
2500 | iscsi_start_tx(conn); | |
2501 | goto done; | |
2502 | ||
2503 | unlock: | |
659743b0 | 2504 | spin_unlock_bh(&session->frwd_lock); |
3fe5ae8b MC |
2505 | done: |
2506 | ISCSI_DBG_EH(session, "tgt %s reset result = %s\n", session->targetname, | |
2507 | rc == SUCCESS ? "SUCCESS" : "FAILED"); | |
2508 | mutex_unlock(&session->eh_mutex); | |
309ce156 JK |
2509 | return rc; |
2510 | } | |
3fe5ae8b | 2511 | |
309ce156 JK |
2512 | /** |
2513 | * iscsi_eh_recover_target - reset target and possibly the session | |
2514 | * @sc: scsi command | |
2515 | * | |
2516 | * This will attempt to send a warm target reset. If that fails, | |
2517 | * we will escalate to ERL0 session recovery. | |
2518 | */ | |
2519 | int iscsi_eh_recover_target(struct scsi_cmnd *sc) | |
2520 | { | |
2521 | int rc; | |
2522 | ||
2523 | rc = iscsi_eh_target_reset(sc); | |
3fe5ae8b MC |
2524 | if (rc == FAILED) |
2525 | rc = iscsi_eh_session_reset(sc); | |
2526 | return rc; | |
2527 | } | |
309ce156 | 2528 | EXPORT_SYMBOL_GPL(iscsi_eh_recover_target); |
3fe5ae8b | 2529 | |
6320377f OK |
2530 | /* |
2531 | * Pre-allocate a pool of @max items of @item_size. By default, the pool | |
2532 | * should be accessed via kfifo_{get,put} on q->queue. | |
2533 | * Optionally, the caller can obtain the array of object pointers | |
2534 | * by passing in a non-NULL @items pointer | |
2535 | */ | |
7996a778 | 2536 | int |
6320377f | 2537 | iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size) |
7996a778 | 2538 | { |
6320377f | 2539 | int i, num_arrays = 1; |
7996a778 | 2540 | |
6320377f | 2541 | memset(q, 0, sizeof(*q)); |
7996a778 MC |
2542 | |
2543 | q->max = max; | |
6320377f OK |
2544 | |
2545 | /* If the user passed an items pointer, he wants a copy of | |
2546 | * the array. */ | |
2547 | if (items) | |
2548 | num_arrays++; | |
778e1cdd | 2549 | q->pool = kvcalloc(num_arrays * max, sizeof(void *), GFP_KERNEL); |
6320377f | 2550 | if (q->pool == NULL) |
f474a37b | 2551 | return -ENOMEM; |
7996a778 | 2552 | |
c1e13f25 | 2553 | kfifo_init(&q->queue, (void*)q->pool, max * sizeof(void*)); |
7996a778 MC |
2554 | |
2555 | for (i = 0; i < max; i++) { | |
6320377f | 2556 | q->pool[i] = kzalloc(item_size, GFP_KERNEL); |
7996a778 | 2557 | if (q->pool[i] == NULL) { |
6320377f OK |
2558 | q->max = i; |
2559 | goto enomem; | |
7996a778 | 2560 | } |
7acd72eb | 2561 | kfifo_in(&q->queue, (void*)&q->pool[i], sizeof(void*)); |
7996a778 | 2562 | } |
6320377f OK |
2563 | |
2564 | if (items) { | |
2565 | *items = q->pool + max; | |
2566 | memcpy(*items, q->pool, max * sizeof(void *)); | |
2567 | } | |
2568 | ||
7996a778 | 2569 | return 0; |
6320377f OK |
2570 | |
2571 | enomem: | |
2572 | iscsi_pool_free(q); | |
2573 | return -ENOMEM; | |
7996a778 MC |
2574 | } |
2575 | EXPORT_SYMBOL_GPL(iscsi_pool_init); | |
2576 | ||
6320377f | 2577 | void iscsi_pool_free(struct iscsi_pool *q) |
7996a778 MC |
2578 | { |
2579 | int i; | |
2580 | ||
2581 | for (i = 0; i < q->max; i++) | |
6320377f | 2582 | kfree(q->pool[i]); |
bfcc62ed | 2583 | kvfree(q->pool); |
7996a778 MC |
2584 | } |
2585 | EXPORT_SYMBOL_GPL(iscsi_pool_free); | |
2586 | ||
a4804cd6 MC |
2587 | /** |
2588 | * iscsi_host_add - add host to system | |
2589 | * @shost: scsi host | |
2590 | * @pdev: parent device | |
2591 | * | |
2592 | * This should be called by partial offload and software iscsi drivers | |
2593 | * to add a host to the system. | |
2594 | */ | |
2595 | int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev) | |
2596 | { | |
8e9a20ce MC |
2597 | if (!shost->can_queue) |
2598 | shost->can_queue = ISCSI_DEF_XMIT_CMDS_MAX; | |
2599 | ||
4d108350 MC |
2600 | if (!shost->cmd_per_lun) |
2601 | shost->cmd_per_lun = ISCSI_DEF_CMD_PER_LUN; | |
2602 | ||
a4804cd6 MC |
2603 | return scsi_add_host(shost, pdev); |
2604 | } | |
2605 | EXPORT_SYMBOL_GPL(iscsi_host_add); | |
2606 | ||
2607 | /** | |
2608 | * iscsi_host_alloc - allocate a host and driver data | |
2609 | * @sht: scsi host template | |
2610 | * @dd_data_size: driver host data size | |
32ae763e | 2611 | * @xmit_can_sleep: bool indicating if LLD will queue IO from a work queue |
a4804cd6 MC |
2612 | * |
2613 | * This should be called by partial offload and software iscsi drivers. | |
2614 | * To access the driver specific memory use the iscsi_host_priv() macro. | |
2615 | */ | |
2616 | struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht, | |
4d108350 | 2617 | int dd_data_size, bool xmit_can_sleep) |
75613521 | 2618 | { |
a4804cd6 | 2619 | struct Scsi_Host *shost; |
e5bd7b54 | 2620 | struct iscsi_host *ihost; |
a4804cd6 MC |
2621 | |
2622 | shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size); | |
2623 | if (!shost) | |
2624 | return NULL; | |
e5bd7b54 | 2625 | ihost = shost_priv(shost); |
32ae763e MC |
2626 | |
2627 | if (xmit_can_sleep) { | |
2628 | snprintf(ihost->workq_name, sizeof(ihost->workq_name), | |
2629 | "iscsi_q_%d", shost->host_no); | |
2630 | ihost->workq = create_singlethread_workqueue(ihost->workq_name); | |
2631 | if (!ihost->workq) | |
2632 | goto free_host; | |
2633 | } | |
2634 | ||
e5bd7b54 MC |
2635 | spin_lock_init(&ihost->lock); |
2636 | ihost->state = ISCSI_HOST_SETUP; | |
2637 | ihost->num_sessions = 0; | |
2638 | init_waitqueue_head(&ihost->session_removal_wq); | |
a4804cd6 | 2639 | return shost; |
32ae763e MC |
2640 | |
2641 | free_host: | |
2642 | scsi_host_put(shost); | |
2643 | return NULL; | |
a4804cd6 MC |
2644 | } |
2645 | EXPORT_SYMBOL_GPL(iscsi_host_alloc); | |
2646 | ||
e5bd7b54 MC |
2647 | static void iscsi_notify_host_removed(struct iscsi_cls_session *cls_session) |
2648 | { | |
40a06e75 | 2649 | iscsi_session_failure(cls_session->dd_data, ISCSI_ERR_INVALID_HOST); |
e5bd7b54 MC |
2650 | } |
2651 | ||
a4804cd6 MC |
2652 | /** |
2653 | * iscsi_host_remove - remove host and sessions | |
2654 | * @shost: scsi host | |
2655 | * | |
e5bd7b54 MC |
2656 | * If there are any sessions left, this will initiate the removal and wait |
2657 | * for the completion. | |
a4804cd6 MC |
2658 | */ |
2659 | void iscsi_host_remove(struct Scsi_Host *shost) | |
2660 | { | |
e5bd7b54 MC |
2661 | struct iscsi_host *ihost = shost_priv(shost); |
2662 | unsigned long flags; | |
2663 | ||
2664 | spin_lock_irqsave(&ihost->lock, flags); | |
2665 | ihost->state = ISCSI_HOST_REMOVED; | |
2666 | spin_unlock_irqrestore(&ihost->lock, flags); | |
2667 | ||
2668 | iscsi_host_for_each_session(shost, iscsi_notify_host_removed); | |
2669 | wait_event_interruptible(ihost->session_removal_wq, | |
2670 | ihost->num_sessions == 0); | |
2671 | if (signal_pending(current)) | |
2672 | flush_signals(current); | |
2673 | ||
a4804cd6 | 2674 | scsi_remove_host(shost); |
32ae763e MC |
2675 | if (ihost->workq) |
2676 | destroy_workqueue(ihost->workq); | |
75613521 | 2677 | } |
a4804cd6 | 2678 | EXPORT_SYMBOL_GPL(iscsi_host_remove); |
7996a778 | 2679 | |
a4804cd6 | 2680 | void iscsi_host_free(struct Scsi_Host *shost) |
75613521 MC |
2681 | { |
2682 | struct iscsi_host *ihost = shost_priv(shost); | |
7996a778 | 2683 | |
75613521 MC |
2684 | kfree(ihost->netdev); |
2685 | kfree(ihost->hwaddress); | |
2686 | kfree(ihost->initiatorname); | |
a4804cd6 | 2687 | scsi_host_put(shost); |
75613521 | 2688 | } |
a4804cd6 | 2689 | EXPORT_SYMBOL_GPL(iscsi_host_free); |
7996a778 | 2690 | |
e5bd7b54 MC |
2691 | static void iscsi_host_dec_session_cnt(struct Scsi_Host *shost) |
2692 | { | |
2693 | struct iscsi_host *ihost = shost_priv(shost); | |
2694 | unsigned long flags; | |
2695 | ||
2696 | shost = scsi_host_get(shost); | |
2697 | if (!shost) { | |
2698 | printk(KERN_ERR "Invalid state. Cannot notify host removal " | |
2699 | "of session teardown event because host already " | |
2700 | "removed.\n"); | |
2701 | return; | |
2702 | } | |
2703 | ||
2704 | spin_lock_irqsave(&ihost->lock, flags); | |
2705 | ihost->num_sessions--; | |
2706 | if (ihost->num_sessions == 0) | |
2707 | wake_up(&ihost->session_removal_wq); | |
2708 | spin_unlock_irqrestore(&ihost->lock, flags); | |
2709 | scsi_host_put(shost); | |
2710 | } | |
2711 | ||
7996a778 MC |
2712 | /** |
2713 | * iscsi_session_setup - create iscsi cls session and host and session | |
7996a778 | 2714 | * @iscsit: iscsi transport template |
75613521 MC |
2715 | * @shost: scsi host |
2716 | * @cmds_max: session can queue | |
ccd4a430 | 2717 | * @dd_size: private driver data size, added to session allocation size |
9c19a7d0 | 2718 | * @cmd_task_size: LLD task private data size |
7996a778 | 2719 | * @initial_cmdsn: initial CmdSN |
ccd4a430 | 2720 | * @id: target ID to add to this session |
7996a778 MC |
2721 | * |
2722 | * This can be used by software iscsi_transports that allocate | |
2723 | * a session per scsi host. | |
3cf7b233 MC |
2724 | * |
2725 | * Callers should set cmds_max to the largest total numer (mgmt + scsi) of | |
2726 | * tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks | |
2727 | * for nop handling and login/logout requests. | |
75613521 | 2728 | */ |
7996a778 | 2729 | struct iscsi_cls_session * |
75613521 | 2730 | iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost, |
b8b9e1b8 | 2731 | uint16_t cmds_max, int dd_size, int cmd_task_size, |
7970634b | 2732 | uint32_t initial_cmdsn, unsigned int id) |
7996a778 | 2733 | { |
e5bd7b54 | 2734 | struct iscsi_host *ihost = shost_priv(shost); |
7996a778 MC |
2735 | struct iscsi_session *session; |
2736 | struct iscsi_cls_session *cls_session; | |
3cf7b233 | 2737 | int cmd_i, scsi_cmds, total_cmds = cmds_max; |
e5bd7b54 MC |
2738 | unsigned long flags; |
2739 | ||
2740 | spin_lock_irqsave(&ihost->lock, flags); | |
2741 | if (ihost->state == ISCSI_HOST_REMOVED) { | |
2742 | spin_unlock_irqrestore(&ihost->lock, flags); | |
2743 | return NULL; | |
2744 | } | |
2745 | ihost->num_sessions++; | |
2746 | spin_unlock_irqrestore(&ihost->lock, flags); | |
8e9a20ce MC |
2747 | |
2748 | if (!total_cmds) | |
2749 | total_cmds = ISCSI_DEF_XMIT_CMDS_MAX; | |
3e5c28ad | 2750 | /* |
3cf7b233 MC |
2751 | * The iscsi layer needs some tasks for nop handling and tmfs, |
2752 | * so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX | |
2753 | * + 1 command for scsi IO. | |
3e5c28ad | 2754 | */ |
3cf7b233 MC |
2755 | if (total_cmds < ISCSI_TOTAL_CMDS_MIN) { |
2756 | printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " | |
2757 | "must be a power of two that is at least %d.\n", | |
2758 | total_cmds, ISCSI_TOTAL_CMDS_MIN); | |
e5bd7b54 | 2759 | goto dec_session_count; |
3cf7b233 MC |
2760 | } |
2761 | ||
2762 | if (total_cmds > ISCSI_TOTAL_CMDS_MAX) { | |
2763 | printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " | |
2764 | "must be a power of 2 less than or equal to %d.\n", | |
2765 | cmds_max, ISCSI_TOTAL_CMDS_MAX); | |
2766 | total_cmds = ISCSI_TOTAL_CMDS_MAX; | |
2767 | } | |
2768 | ||
2769 | if (!is_power_of_2(total_cmds)) { | |
2770 | printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " | |
2771 | "must be a power of 2.\n", total_cmds); | |
2772 | total_cmds = rounddown_pow_of_two(total_cmds); | |
2773 | if (total_cmds < ISCSI_TOTAL_CMDS_MIN) | |
2774 | return NULL; | |
2775 | printk(KERN_INFO "iscsi: Rounding can_queue to %d.\n", | |
2776 | total_cmds); | |
1548271e | 2777 | } |
3cf7b233 | 2778 | scsi_cmds = total_cmds - ISCSI_MGMT_CMDS_MAX; |
1548271e | 2779 | |
5d91e209 | 2780 | cls_session = iscsi_alloc_session(shost, iscsit, |
b8b9e1b8 JK |
2781 | sizeof(struct iscsi_session) + |
2782 | dd_size); | |
75613521 | 2783 | if (!cls_session) |
e5bd7b54 | 2784 | goto dec_session_count; |
75613521 MC |
2785 | session = cls_session->dd_data; |
2786 | session->cls_session = cls_session; | |
7996a778 MC |
2787 | session->host = shost; |
2788 | session->state = ISCSI_STATE_FREE; | |
f6d5180c | 2789 | session->fast_abort = 1; |
3fe5ae8b | 2790 | session->tgt_reset_timeout = 30; |
4cd49ea1 MC |
2791 | session->lu_reset_timeout = 15; |
2792 | session->abort_timeout = 10; | |
3cf7b233 MC |
2793 | session->scsi_cmds_max = scsi_cmds; |
2794 | session->cmds_max = total_cmds; | |
e0726407 | 2795 | session->queued_cmdsn = session->cmdsn = initial_cmdsn; |
7996a778 MC |
2796 | session->exp_cmdsn = initial_cmdsn + 1; |
2797 | session->max_cmdsn = initial_cmdsn + 1; | |
2798 | session->max_r2t = 1; | |
2799 | session->tt = iscsit; | |
b8b9e1b8 | 2800 | session->dd_data = cls_session->dd_data + sizeof(*session); |
659743b0 | 2801 | |
6724add1 | 2802 | mutex_init(&session->eh_mutex); |
659743b0 SP |
2803 | spin_lock_init(&session->frwd_lock); |
2804 | spin_lock_init(&session->back_lock); | |
7996a778 MC |
2805 | |
2806 | /* initialize SCSI PDU commands pool */ | |
2807 | if (iscsi_pool_init(&session->cmdpool, session->cmds_max, | |
2808 | (void***)&session->cmds, | |
9c19a7d0 | 2809 | cmd_task_size + sizeof(struct iscsi_task))) |
7996a778 MC |
2810 | goto cmdpool_alloc_fail; |
2811 | ||
2812 | /* pre-format cmds pool with ITT */ | |
2813 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
9c19a7d0 | 2814 | struct iscsi_task *task = session->cmds[cmd_i]; |
7996a778 | 2815 | |
9c19a7d0 MC |
2816 | if (cmd_task_size) |
2817 | task->dd_data = &task[1]; | |
2818 | task->itt = cmd_i; | |
3bbaaad9 | 2819 | task->state = ISCSI_TASK_FREE; |
9c19a7d0 | 2820 | INIT_LIST_HEAD(&task->running); |
7996a778 MC |
2821 | } |
2822 | ||
f53a88da | 2823 | if (!try_module_get(iscsit->owner)) |
75613521 | 2824 | goto module_get_fail; |
7996a778 | 2825 | |
7970634b | 2826 | if (iscsi_add_session(cls_session, id)) |
75613521 | 2827 | goto cls_session_fail; |
e5bd7b54 | 2828 | |
7996a778 MC |
2829 | return cls_session; |
2830 | ||
2831 | cls_session_fail: | |
75613521 MC |
2832 | module_put(iscsit->owner); |
2833 | module_get_fail: | |
6320377f | 2834 | iscsi_pool_free(&session->cmdpool); |
7996a778 | 2835 | cmdpool_alloc_fail: |
75613521 | 2836 | iscsi_free_session(cls_session); |
e5bd7b54 MC |
2837 | dec_session_count: |
2838 | iscsi_host_dec_session_cnt(shost); | |
7996a778 MC |
2839 | return NULL; |
2840 | } | |
2841 | EXPORT_SYMBOL_GPL(iscsi_session_setup); | |
2842 | ||
2843 | /** | |
2844 | * iscsi_session_teardown - destroy session, host, and cls_session | |
75613521 | 2845 | * @cls_session: iscsi session |
75613521 | 2846 | */ |
7996a778 MC |
2847 | void iscsi_session_teardown(struct iscsi_cls_session *cls_session) |
2848 | { | |
75613521 | 2849 | struct iscsi_session *session = cls_session->dd_data; |
63f75cc8 | 2850 | struct module *owner = cls_session->transport->owner; |
e5bd7b54 | 2851 | struct Scsi_Host *shost = session->host; |
7996a778 | 2852 | |
6320377f | 2853 | iscsi_pool_free(&session->cmdpool); |
7996a778 | 2854 | |
9e10b512 KK |
2855 | iscsi_remove_session(cls_session); |
2856 | ||
b2c64167 MC |
2857 | kfree(session->password); |
2858 | kfree(session->password_in); | |
2859 | kfree(session->username); | |
2860 | kfree(session->username_in); | |
f3ff0c36 | 2861 | kfree(session->targetname); |
3c5c4801 | 2862 | kfree(session->targetalias); |
88dfd340 | 2863 | kfree(session->initiatorname); |
3b9373e9 EW |
2864 | kfree(session->boot_root); |
2865 | kfree(session->boot_nic); | |
2866 | kfree(session->boot_target); | |
88dfd340 | 2867 | kfree(session->ifacename); |
f8525eb4 AC |
2868 | kfree(session->portal_type); |
2869 | kfree(session->discovery_parent_type); | |
f3ff0c36 | 2870 | |
9e10b512 KK |
2871 | iscsi_free_session(cls_session); |
2872 | ||
e5bd7b54 | 2873 | iscsi_host_dec_session_cnt(shost); |
63f75cc8 | 2874 | module_put(owner); |
7996a778 MC |
2875 | } |
2876 | EXPORT_SYMBOL_GPL(iscsi_session_teardown); | |
2877 | ||
2878 | /** | |
2879 | * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn | |
2880 | * @cls_session: iscsi_cls_session | |
5d91e209 | 2881 | * @dd_size: private driver data size |
7996a778 | 2882 | * @conn_idx: cid |
5d91e209 | 2883 | */ |
7996a778 | 2884 | struct iscsi_cls_conn * |
5d91e209 MC |
2885 | iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size, |
2886 | uint32_t conn_idx) | |
7996a778 | 2887 | { |
75613521 | 2888 | struct iscsi_session *session = cls_session->dd_data; |
7996a778 MC |
2889 | struct iscsi_conn *conn; |
2890 | struct iscsi_cls_conn *cls_conn; | |
d36ab6f3 | 2891 | char *data; |
7996a778 | 2892 | |
5d91e209 MC |
2893 | cls_conn = iscsi_create_conn(cls_session, sizeof(*conn) + dd_size, |
2894 | conn_idx); | |
7996a778 MC |
2895 | if (!cls_conn) |
2896 | return NULL; | |
2897 | conn = cls_conn->dd_data; | |
5d91e209 | 2898 | memset(conn, 0, sizeof(*conn) + dd_size); |
7996a778 | 2899 | |
5d91e209 | 2900 | conn->dd_data = cls_conn->dd_data + sizeof(*conn); |
7996a778 MC |
2901 | conn->session = session; |
2902 | conn->cls_conn = cls_conn; | |
2903 | conn->c_stage = ISCSI_CONN_INITIAL_STAGE; | |
2904 | conn->id = conn_idx; | |
2905 | conn->exp_statsn = 0; | |
843c0a8a | 2906 | conn->tmf_state = TMF_INITIAL; |
f6d5180c | 2907 | |
2c4b9637 | 2908 | timer_setup(&conn->transport_timer, iscsi_check_transport_timeouts, 0); |
f6d5180c | 2909 | |
843c0a8a | 2910 | INIT_LIST_HEAD(&conn->mgmtqueue); |
3bbaaad9 | 2911 | INIT_LIST_HEAD(&conn->cmdqueue); |
843c0a8a | 2912 | INIT_LIST_HEAD(&conn->requeue); |
6f8830f5 | 2913 | spin_lock_init(&conn->taskqueuelock); |
c4028958 | 2914 | INIT_WORK(&conn->xmitwork, iscsi_xmitworker); |
7996a778 | 2915 | |
9c19a7d0 | 2916 | /* allocate login_task used for the login/text sequences */ |
659743b0 | 2917 | spin_lock_bh(&session->frwd_lock); |
7acd72eb | 2918 | if (!kfifo_out(&session->cmdpool.queue, |
9c19a7d0 | 2919 | (void*)&conn->login_task, |
7996a778 | 2920 | sizeof(void*))) { |
659743b0 | 2921 | spin_unlock_bh(&session->frwd_lock); |
9c19a7d0 | 2922 | goto login_task_alloc_fail; |
7996a778 | 2923 | } |
659743b0 | 2924 | spin_unlock_bh(&session->frwd_lock); |
7996a778 | 2925 | |
cfeb2cf9 MC |
2926 | data = (char *) __get_free_pages(GFP_KERNEL, |
2927 | get_order(ISCSI_DEF_MAX_RECV_SEG_LEN)); | |
d36ab6f3 | 2928 | if (!data) |
9c19a7d0 MC |
2929 | goto login_task_data_alloc_fail; |
2930 | conn->login_task->data = conn->data = data; | |
d36ab6f3 | 2931 | |
2c4b9637 | 2932 | timer_setup(&conn->tmf_timer, iscsi_tmf_timedout, 0); |
7996a778 MC |
2933 | init_waitqueue_head(&conn->ehwait); |
2934 | ||
2935 | return cls_conn; | |
2936 | ||
9c19a7d0 | 2937 | login_task_data_alloc_fail: |
7acd72eb | 2938 | kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task, |
d36ab6f3 | 2939 | sizeof(void*)); |
9c19a7d0 | 2940 | login_task_alloc_fail: |
7996a778 MC |
2941 | iscsi_destroy_conn(cls_conn); |
2942 | return NULL; | |
2943 | } | |
2944 | EXPORT_SYMBOL_GPL(iscsi_conn_setup); | |
2945 | ||
2946 | /** | |
2947 | * iscsi_conn_teardown - teardown iscsi connection | |
ccd4a430 | 2948 | * @cls_conn: iscsi class connection |
7996a778 MC |
2949 | * |
2950 | * TODO: we may need to make this into a two step process | |
2951 | * like scsi-mls remove + put host | |
2952 | */ | |
2953 | void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn) | |
2954 | { | |
2955 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2956 | struct iscsi_session *session = conn->session; | |
7996a778 | 2957 | |
f6d5180c MC |
2958 | del_timer_sync(&conn->transport_timer); |
2959 | ||
660d0831 | 2960 | mutex_lock(&session->eh_mutex); |
659743b0 | 2961 | spin_lock_bh(&session->frwd_lock); |
7996a778 MC |
2962 | conn->c_stage = ISCSI_CONN_CLEANUP_WAIT; |
2963 | if (session->leadconn == conn) { | |
2964 | /* | |
2965 | * leading connection? then give up on recovery. | |
2966 | */ | |
2967 | session->state = ISCSI_STATE_TERMINATE; | |
2968 | wake_up(&conn->ehwait); | |
2969 | } | |
659743b0 | 2970 | spin_unlock_bh(&session->frwd_lock); |
7996a778 | 2971 | |
779ea120 | 2972 | /* flush queued up work because we free the connection below */ |
843c0a8a | 2973 | iscsi_suspend_tx(conn); |
779ea120 | 2974 | |
659743b0 | 2975 | spin_lock_bh(&session->frwd_lock); |
cfeb2cf9 MC |
2976 | free_pages((unsigned long) conn->data, |
2977 | get_order(ISCSI_DEF_MAX_RECV_SEG_LEN)); | |
f3ff0c36 | 2978 | kfree(conn->persistent_address); |
ae56ff40 | 2979 | kfree(conn->local_ipaddr); |
659743b0 SP |
2980 | /* regular RX path uses back_lock */ |
2981 | spin_lock_bh(&session->back_lock); | |
7acd72eb | 2982 | kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task, |
7996a778 | 2983 | sizeof(void*)); |
659743b0 | 2984 | spin_unlock_bh(&session->back_lock); |
e0726407 | 2985 | if (session->leadconn == conn) |
7996a778 | 2986 | session->leadconn = NULL; |
659743b0 | 2987 | spin_unlock_bh(&session->frwd_lock); |
660d0831 | 2988 | mutex_unlock(&session->eh_mutex); |
7996a778 | 2989 | |
7996a778 MC |
2990 | iscsi_destroy_conn(cls_conn); |
2991 | } | |
2992 | EXPORT_SYMBOL_GPL(iscsi_conn_teardown); | |
2993 | ||
2994 | int iscsi_conn_start(struct iscsi_cls_conn *cls_conn) | |
2995 | { | |
2996 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2997 | struct iscsi_session *session = conn->session; | |
2998 | ||
ffd0436e | 2999 | if (!session) { |
322d739d MC |
3000 | iscsi_conn_printk(KERN_ERR, conn, |
3001 | "can't start unbound connection\n"); | |
7996a778 MC |
3002 | return -EPERM; |
3003 | } | |
3004 | ||
db98ccde MC |
3005 | if ((session->imm_data_en || !session->initial_r2t_en) && |
3006 | session->first_burst > session->max_burst) { | |
322d739d MC |
3007 | iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: " |
3008 | "first_burst %d max_burst %d\n", | |
3009 | session->first_burst, session->max_burst); | |
ffd0436e MC |
3010 | return -EINVAL; |
3011 | } | |
3012 | ||
f6d5180c | 3013 | if (conn->ping_timeout && !conn->recv_timeout) { |
322d739d MC |
3014 | iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of " |
3015 | "zero. Using 5 seconds\n."); | |
f6d5180c MC |
3016 | conn->recv_timeout = 5; |
3017 | } | |
3018 | ||
3019 | if (conn->recv_timeout && !conn->ping_timeout) { | |
322d739d MC |
3020 | iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of " |
3021 | "zero. Using 5 seconds.\n"); | |
f6d5180c MC |
3022 | conn->ping_timeout = 5; |
3023 | } | |
3024 | ||
659743b0 | 3025 | spin_lock_bh(&session->frwd_lock); |
7996a778 MC |
3026 | conn->c_stage = ISCSI_CONN_STARTED; |
3027 | session->state = ISCSI_STATE_LOGGED_IN; | |
e0726407 | 3028 | session->queued_cmdsn = session->cmdsn; |
7996a778 | 3029 | |
f6d5180c MC |
3030 | conn->last_recv = jiffies; |
3031 | conn->last_ping = jiffies; | |
3032 | if (conn->recv_timeout && conn->ping_timeout) | |
3033 | mod_timer(&conn->transport_timer, | |
3034 | jiffies + (conn->recv_timeout * HZ)); | |
3035 | ||
7996a778 MC |
3036 | switch(conn->stop_stage) { |
3037 | case STOP_CONN_RECOVER: | |
3038 | /* | |
3039 | * unblock eh_abort() if it is blocked. re-try all | |
3040 | * commands after successful recovery | |
3041 | */ | |
7996a778 | 3042 | conn->stop_stage = 0; |
843c0a8a | 3043 | conn->tmf_state = TMF_INITIAL; |
7996a778 | 3044 | session->age++; |
8b1d0343 MC |
3045 | if (session->age == 16) |
3046 | session->age = 0; | |
6eabafbe | 3047 | break; |
7996a778 | 3048 | case STOP_CONN_TERM: |
7996a778 | 3049 | conn->stop_stage = 0; |
7996a778 MC |
3050 | break; |
3051 | default: | |
3052 | break; | |
3053 | } | |
659743b0 | 3054 | spin_unlock_bh(&session->frwd_lock); |
7996a778 | 3055 | |
75613521 | 3056 | iscsi_unblock_session(session->cls_session); |
6eabafbe | 3057 | wake_up(&conn->ehwait); |
7996a778 MC |
3058 | return 0; |
3059 | } | |
3060 | EXPORT_SYMBOL_GPL(iscsi_conn_start); | |
3061 | ||
3062 | static void | |
3bbaaad9 | 3063 | fail_mgmt_tasks(struct iscsi_session *session, struct iscsi_conn *conn) |
7996a778 | 3064 | { |
3bbaaad9 | 3065 | struct iscsi_task *task; |
b3cd5050 | 3066 | int i, state; |
7996a778 | 3067 | |
3bbaaad9 MC |
3068 | for (i = 0; i < conn->session->cmds_max; i++) { |
3069 | task = conn->session->cmds[i]; | |
3070 | if (task->sc) | |
3071 | continue; | |
7996a778 | 3072 | |
3bbaaad9 MC |
3073 | if (task->state == ISCSI_TASK_FREE) |
3074 | continue; | |
7996a778 | 3075 | |
3bbaaad9 MC |
3076 | ISCSI_DBG_SESSION(conn->session, |
3077 | "failing mgmt itt 0x%x state %d\n", | |
3078 | task->itt, task->state); | |
b3cd5050 MC |
3079 | state = ISCSI_TASK_ABRT_SESS_RECOV; |
3080 | if (task->state == ISCSI_TASK_PENDING) | |
3081 | state = ISCSI_TASK_COMPLETED; | |
a656183e | 3082 | spin_lock_bh(&session->back_lock); |
b3cd5050 | 3083 | iscsi_complete_task(task, state); |
a656183e | 3084 | spin_unlock_bh(&session->back_lock); |
3bbaaad9 | 3085 | } |
7996a778 MC |
3086 | } |
3087 | ||
656cffc9 MC |
3088 | static void iscsi_start_session_recovery(struct iscsi_session *session, |
3089 | struct iscsi_conn *conn, int flag) | |
7996a778 | 3090 | { |
ed2abc7f MC |
3091 | int old_stop_stage; |
3092 | ||
6724add1 | 3093 | mutex_lock(&session->eh_mutex); |
659743b0 | 3094 | spin_lock_bh(&session->frwd_lock); |
ed2abc7f | 3095 | if (conn->stop_stage == STOP_CONN_TERM) { |
659743b0 | 3096 | spin_unlock_bh(&session->frwd_lock); |
6724add1 MC |
3097 | mutex_unlock(&session->eh_mutex); |
3098 | return; | |
3099 | } | |
3100 | ||
ed2abc7f MC |
3101 | /* |
3102 | * When this is called for the in_login state, we only want to clean | |
9c19a7d0 | 3103 | * up the login task and connection. We do not need to block and set |
67a61114 | 3104 | * the recovery state again |
ed2abc7f | 3105 | */ |
67a61114 MC |
3106 | if (flag == STOP_CONN_TERM) |
3107 | session->state = ISCSI_STATE_TERMINATE; | |
3108 | else if (conn->stop_stage != STOP_CONN_RECOVER) | |
3109 | session->state = ISCSI_STATE_IN_RECOVERY; | |
4ae0a6c1 MC |
3110 | |
3111 | old_stop_stage = conn->stop_stage; | |
3112 | conn->stop_stage = flag; | |
659743b0 | 3113 | spin_unlock_bh(&session->frwd_lock); |
ed2abc7f | 3114 | |
26013ad4 MC |
3115 | del_timer_sync(&conn->transport_timer); |
3116 | iscsi_suspend_tx(conn); | |
3117 | ||
659743b0 | 3118 | spin_lock_bh(&session->frwd_lock); |
67a61114 | 3119 | conn->c_stage = ISCSI_CONN_STOPPED; |
659743b0 | 3120 | spin_unlock_bh(&session->frwd_lock); |
6724add1 | 3121 | |
7996a778 MC |
3122 | /* |
3123 | * for connection level recovery we should not calculate | |
3124 | * header digest. conn->hdr_size used for optimization | |
3125 | * in hdr_extract() and will be re-negotiated at | |
3126 | * set_param() time. | |
3127 | */ | |
3128 | if (flag == STOP_CONN_RECOVER) { | |
3129 | conn->hdrdgst_en = 0; | |
3130 | conn->datadgst_en = 0; | |
656cffc9 | 3131 | if (session->state == ISCSI_STATE_IN_RECOVERY && |
67a61114 | 3132 | old_stop_stage != STOP_CONN_RECOVER) { |
1b2c7af8 | 3133 | ISCSI_DBG_SESSION(session, "blocking session\n"); |
75613521 | 3134 | iscsi_block_session(session->cls_session); |
67a61114 | 3135 | } |
7996a778 | 3136 | } |
656cffc9 | 3137 | |
656cffc9 MC |
3138 | /* |
3139 | * flush queues. | |
3140 | */ | |
659743b0 | 3141 | spin_lock_bh(&session->frwd_lock); |
b3cd5050 | 3142 | fail_scsi_tasks(conn, -1, DID_TRANSPORT_DISRUPTED); |
3bbaaad9 | 3143 | fail_mgmt_tasks(session, conn); |
5d12c05e | 3144 | memset(&conn->tmhdr, 0, sizeof(conn->tmhdr)); |
659743b0 | 3145 | spin_unlock_bh(&session->frwd_lock); |
6724add1 | 3146 | mutex_unlock(&session->eh_mutex); |
7996a778 | 3147 | } |
7996a778 MC |
3148 | |
3149 | void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) | |
3150 | { | |
3151 | struct iscsi_conn *conn = cls_conn->dd_data; | |
3152 | struct iscsi_session *session = conn->session; | |
3153 | ||
3154 | switch (flag) { | |
3155 | case STOP_CONN_RECOVER: | |
3156 | case STOP_CONN_TERM: | |
3157 | iscsi_start_session_recovery(session, conn, flag); | |
8d2860b3 | 3158 | break; |
7996a778 | 3159 | default: |
322d739d MC |
3160 | iscsi_conn_printk(KERN_ERR, conn, |
3161 | "invalid stop flag %d\n", flag); | |
7996a778 MC |
3162 | } |
3163 | } | |
3164 | EXPORT_SYMBOL_GPL(iscsi_conn_stop); | |
3165 | ||
3166 | int iscsi_conn_bind(struct iscsi_cls_session *cls_session, | |
3167 | struct iscsi_cls_conn *cls_conn, int is_leading) | |
3168 | { | |
75613521 | 3169 | struct iscsi_session *session = cls_session->dd_data; |
98644047 | 3170 | struct iscsi_conn *conn = cls_conn->dd_data; |
7996a778 | 3171 | |
659743b0 | 3172 | spin_lock_bh(&session->frwd_lock); |
7996a778 MC |
3173 | if (is_leading) |
3174 | session->leadconn = conn; | |
659743b0 | 3175 | spin_unlock_bh(&session->frwd_lock); |
7996a778 MC |
3176 | |
3177 | /* | |
3178 | * Unblock xmitworker(), Login Phase will pass through. | |
3179 | */ | |
3180 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
3181 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
3182 | return 0; | |
3183 | } | |
3184 | EXPORT_SYMBOL_GPL(iscsi_conn_bind); | |
3185 | ||
adaf6990 | 3186 | int iscsi_switch_str_param(char **param, char *new_val_buf) |
5700b1af MC |
3187 | { |
3188 | char *new_val; | |
3189 | ||
3190 | if (*param) { | |
3191 | if (!strcmp(*param, new_val_buf)) | |
3192 | return 0; | |
3193 | } | |
3194 | ||
3195 | new_val = kstrdup(new_val_buf, GFP_NOIO); | |
3196 | if (!new_val) | |
3197 | return -ENOMEM; | |
3198 | ||
3199 | kfree(*param); | |
3200 | *param = new_val; | |
3201 | return 0; | |
3202 | } | |
adaf6990 | 3203 | EXPORT_SYMBOL_GPL(iscsi_switch_str_param); |
a54a52ca MC |
3204 | |
3205 | int iscsi_set_param(struct iscsi_cls_conn *cls_conn, | |
3206 | enum iscsi_param param, char *buf, int buflen) | |
3207 | { | |
3208 | struct iscsi_conn *conn = cls_conn->dd_data; | |
3209 | struct iscsi_session *session = conn->session; | |
6a06a4b8 | 3210 | int val; |
a54a52ca MC |
3211 | |
3212 | switch(param) { | |
843c0a8a MC |
3213 | case ISCSI_PARAM_FAST_ABORT: |
3214 | sscanf(buf, "%d", &session->fast_abort); | |
3215 | break; | |
f6d5180c MC |
3216 | case ISCSI_PARAM_ABORT_TMO: |
3217 | sscanf(buf, "%d", &session->abort_timeout); | |
3218 | break; | |
3219 | case ISCSI_PARAM_LU_RESET_TMO: | |
3220 | sscanf(buf, "%d", &session->lu_reset_timeout); | |
3221 | break; | |
3fe5ae8b MC |
3222 | case ISCSI_PARAM_TGT_RESET_TMO: |
3223 | sscanf(buf, "%d", &session->tgt_reset_timeout); | |
3224 | break; | |
f6d5180c MC |
3225 | case ISCSI_PARAM_PING_TMO: |
3226 | sscanf(buf, "%d", &conn->ping_timeout); | |
3227 | break; | |
3228 | case ISCSI_PARAM_RECV_TMO: | |
3229 | sscanf(buf, "%d", &conn->recv_timeout); | |
3230 | break; | |
a54a52ca MC |
3231 | case ISCSI_PARAM_MAX_RECV_DLENGTH: |
3232 | sscanf(buf, "%d", &conn->max_recv_dlength); | |
3233 | break; | |
3234 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
3235 | sscanf(buf, "%d", &conn->max_xmit_dlength); | |
3236 | break; | |
3237 | case ISCSI_PARAM_HDRDGST_EN: | |
3238 | sscanf(buf, "%d", &conn->hdrdgst_en); | |
3239 | break; | |
3240 | case ISCSI_PARAM_DATADGST_EN: | |
3241 | sscanf(buf, "%d", &conn->datadgst_en); | |
3242 | break; | |
3243 | case ISCSI_PARAM_INITIAL_R2T_EN: | |
3244 | sscanf(buf, "%d", &session->initial_r2t_en); | |
3245 | break; | |
3246 | case ISCSI_PARAM_MAX_R2T: | |
1304be5f | 3247 | sscanf(buf, "%hu", &session->max_r2t); |
a54a52ca MC |
3248 | break; |
3249 | case ISCSI_PARAM_IMM_DATA_EN: | |
3250 | sscanf(buf, "%d", &session->imm_data_en); | |
3251 | break; | |
3252 | case ISCSI_PARAM_FIRST_BURST: | |
3253 | sscanf(buf, "%d", &session->first_burst); | |
3254 | break; | |
3255 | case ISCSI_PARAM_MAX_BURST: | |
3256 | sscanf(buf, "%d", &session->max_burst); | |
3257 | break; | |
3258 | case ISCSI_PARAM_PDU_INORDER_EN: | |
3259 | sscanf(buf, "%d", &session->pdu_inorder_en); | |
3260 | break; | |
3261 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
3262 | sscanf(buf, "%d", &session->dataseq_inorder_en); | |
3263 | break; | |
3264 | case ISCSI_PARAM_ERL: | |
3265 | sscanf(buf, "%d", &session->erl); | |
3266 | break; | |
a54a52ca MC |
3267 | case ISCSI_PARAM_EXP_STATSN: |
3268 | sscanf(buf, "%u", &conn->exp_statsn); | |
3269 | break; | |
b2c64167 | 3270 | case ISCSI_PARAM_USERNAME: |
5700b1af | 3271 | return iscsi_switch_str_param(&session->username, buf); |
b2c64167 | 3272 | case ISCSI_PARAM_USERNAME_IN: |
5700b1af | 3273 | return iscsi_switch_str_param(&session->username_in, buf); |
b2c64167 | 3274 | case ISCSI_PARAM_PASSWORD: |
5700b1af | 3275 | return iscsi_switch_str_param(&session->password, buf); |
b2c64167 | 3276 | case ISCSI_PARAM_PASSWORD_IN: |
5700b1af | 3277 | return iscsi_switch_str_param(&session->password_in, buf); |
a54a52ca | 3278 | case ISCSI_PARAM_TARGET_NAME: |
5700b1af | 3279 | return iscsi_switch_str_param(&session->targetname, buf); |
3c5c4801 VC |
3280 | case ISCSI_PARAM_TARGET_ALIAS: |
3281 | return iscsi_switch_str_param(&session->targetalias, buf); | |
a54a52ca MC |
3282 | case ISCSI_PARAM_TPGT: |
3283 | sscanf(buf, "%d", &session->tpgt); | |
3284 | break; | |
3285 | case ISCSI_PARAM_PERSISTENT_PORT: | |
3286 | sscanf(buf, "%d", &conn->persistent_port); | |
3287 | break; | |
3288 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
5700b1af | 3289 | return iscsi_switch_str_param(&conn->persistent_address, buf); |
88dfd340 | 3290 | case ISCSI_PARAM_IFACE_NAME: |
5700b1af | 3291 | return iscsi_switch_str_param(&session->ifacename, buf); |
88dfd340 | 3292 | case ISCSI_PARAM_INITIATOR_NAME: |
5700b1af | 3293 | return iscsi_switch_str_param(&session->initiatorname, buf); |
3b9373e9 EW |
3294 | case ISCSI_PARAM_BOOT_ROOT: |
3295 | return iscsi_switch_str_param(&session->boot_root, buf); | |
3296 | case ISCSI_PARAM_BOOT_NIC: | |
3297 | return iscsi_switch_str_param(&session->boot_nic, buf); | |
3298 | case ISCSI_PARAM_BOOT_TARGET: | |
3299 | return iscsi_switch_str_param(&session->boot_target, buf); | |
f8525eb4 AC |
3300 | case ISCSI_PARAM_PORTAL_TYPE: |
3301 | return iscsi_switch_str_param(&session->portal_type, buf); | |
3302 | case ISCSI_PARAM_DISCOVERY_PARENT_TYPE: | |
3303 | return iscsi_switch_str_param(&session->discovery_parent_type, | |
3304 | buf); | |
6a06a4b8 OG |
3305 | case ISCSI_PARAM_DISCOVERY_SESS: |
3306 | sscanf(buf, "%d", &val); | |
3307 | session->discovery_sess = !!val; | |
3308 | break; | |
ae56ff40 AC |
3309 | case ISCSI_PARAM_LOCAL_IPADDR: |
3310 | return iscsi_switch_str_param(&conn->local_ipaddr, buf); | |
a54a52ca MC |
3311 | default: |
3312 | return -ENOSYS; | |
3313 | } | |
3314 | ||
3315 | return 0; | |
3316 | } | |
3317 | EXPORT_SYMBOL_GPL(iscsi_set_param); | |
3318 | ||
3319 | int iscsi_session_get_param(struct iscsi_cls_session *cls_session, | |
3320 | enum iscsi_param param, char *buf) | |
3321 | { | |
75613521 | 3322 | struct iscsi_session *session = cls_session->dd_data; |
a54a52ca MC |
3323 | int len; |
3324 | ||
3325 | switch(param) { | |
843c0a8a MC |
3326 | case ISCSI_PARAM_FAST_ABORT: |
3327 | len = sprintf(buf, "%d\n", session->fast_abort); | |
3328 | break; | |
f6d5180c MC |
3329 | case ISCSI_PARAM_ABORT_TMO: |
3330 | len = sprintf(buf, "%d\n", session->abort_timeout); | |
3331 | break; | |
3332 | case ISCSI_PARAM_LU_RESET_TMO: | |
3333 | len = sprintf(buf, "%d\n", session->lu_reset_timeout); | |
3334 | break; | |
3fe5ae8b MC |
3335 | case ISCSI_PARAM_TGT_RESET_TMO: |
3336 | len = sprintf(buf, "%d\n", session->tgt_reset_timeout); | |
3337 | break; | |
a54a52ca MC |
3338 | case ISCSI_PARAM_INITIAL_R2T_EN: |
3339 | len = sprintf(buf, "%d\n", session->initial_r2t_en); | |
3340 | break; | |
3341 | case ISCSI_PARAM_MAX_R2T: | |
3342 | len = sprintf(buf, "%hu\n", session->max_r2t); | |
3343 | break; | |
3344 | case ISCSI_PARAM_IMM_DATA_EN: | |
3345 | len = sprintf(buf, "%d\n", session->imm_data_en); | |
3346 | break; | |
3347 | case ISCSI_PARAM_FIRST_BURST: | |
3348 | len = sprintf(buf, "%u\n", session->first_burst); | |
3349 | break; | |
3350 | case ISCSI_PARAM_MAX_BURST: | |
3351 | len = sprintf(buf, "%u\n", session->max_burst); | |
3352 | break; | |
3353 | case ISCSI_PARAM_PDU_INORDER_EN: | |
3354 | len = sprintf(buf, "%d\n", session->pdu_inorder_en); | |
3355 | break; | |
3356 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
3357 | len = sprintf(buf, "%d\n", session->dataseq_inorder_en); | |
3358 | break; | |
5f09e1f3 AC |
3359 | case ISCSI_PARAM_DEF_TASKMGMT_TMO: |
3360 | len = sprintf(buf, "%d\n", session->def_taskmgmt_tmo); | |
3361 | break; | |
a54a52ca MC |
3362 | case ISCSI_PARAM_ERL: |
3363 | len = sprintf(buf, "%d\n", session->erl); | |
3364 | break; | |
3365 | case ISCSI_PARAM_TARGET_NAME: | |
3366 | len = sprintf(buf, "%s\n", session->targetname); | |
3367 | break; | |
3c5c4801 VC |
3368 | case ISCSI_PARAM_TARGET_ALIAS: |
3369 | len = sprintf(buf, "%s\n", session->targetalias); | |
3370 | break; | |
a54a52ca MC |
3371 | case ISCSI_PARAM_TPGT: |
3372 | len = sprintf(buf, "%d\n", session->tpgt); | |
3373 | break; | |
b2c64167 MC |
3374 | case ISCSI_PARAM_USERNAME: |
3375 | len = sprintf(buf, "%s\n", session->username); | |
3376 | break; | |
3377 | case ISCSI_PARAM_USERNAME_IN: | |
3378 | len = sprintf(buf, "%s\n", session->username_in); | |
3379 | break; | |
3380 | case ISCSI_PARAM_PASSWORD: | |
3381 | len = sprintf(buf, "%s\n", session->password); | |
3382 | break; | |
3383 | case ISCSI_PARAM_PASSWORD_IN: | |
3384 | len = sprintf(buf, "%s\n", session->password_in); | |
3385 | break; | |
88dfd340 MC |
3386 | case ISCSI_PARAM_IFACE_NAME: |
3387 | len = sprintf(buf, "%s\n", session->ifacename); | |
3388 | break; | |
3389 | case ISCSI_PARAM_INITIATOR_NAME: | |
5700b1af | 3390 | len = sprintf(buf, "%s\n", session->initiatorname); |
88dfd340 | 3391 | break; |
3b9373e9 EW |
3392 | case ISCSI_PARAM_BOOT_ROOT: |
3393 | len = sprintf(buf, "%s\n", session->boot_root); | |
3394 | break; | |
3395 | case ISCSI_PARAM_BOOT_NIC: | |
3396 | len = sprintf(buf, "%s\n", session->boot_nic); | |
3397 | break; | |
3398 | case ISCSI_PARAM_BOOT_TARGET: | |
3399 | len = sprintf(buf, "%s\n", session->boot_target); | |
9a2307b1 | 3400 | break; |
f8525eb4 AC |
3401 | case ISCSI_PARAM_AUTO_SND_TGT_DISABLE: |
3402 | len = sprintf(buf, "%u\n", session->auto_snd_tgt_disable); | |
3403 | break; | |
3404 | case ISCSI_PARAM_DISCOVERY_SESS: | |
3405 | len = sprintf(buf, "%u\n", session->discovery_sess); | |
3406 | break; | |
3407 | case ISCSI_PARAM_PORTAL_TYPE: | |
3408 | len = sprintf(buf, "%s\n", session->portal_type); | |
3409 | break; | |
3410 | case ISCSI_PARAM_CHAP_AUTH_EN: | |
3411 | len = sprintf(buf, "%u\n", session->chap_auth_en); | |
3412 | break; | |
3413 | case ISCSI_PARAM_DISCOVERY_LOGOUT_EN: | |
3414 | len = sprintf(buf, "%u\n", session->discovery_logout_en); | |
3415 | break; | |
3416 | case ISCSI_PARAM_BIDI_CHAP_EN: | |
3417 | len = sprintf(buf, "%u\n", session->bidi_chap_en); | |
3418 | break; | |
3419 | case ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL: | |
3420 | len = sprintf(buf, "%u\n", session->discovery_auth_optional); | |
3421 | break; | |
3422 | case ISCSI_PARAM_DEF_TIME2WAIT: | |
3423 | len = sprintf(buf, "%d\n", session->time2wait); | |
3424 | break; | |
3425 | case ISCSI_PARAM_DEF_TIME2RETAIN: | |
3426 | len = sprintf(buf, "%d\n", session->time2retain); | |
3427 | break; | |
3428 | case ISCSI_PARAM_TSID: | |
3429 | len = sprintf(buf, "%u\n", session->tsid); | |
3430 | break; | |
3431 | case ISCSI_PARAM_ISID: | |
3432 | len = sprintf(buf, "%02x%02x%02x%02x%02x%02x\n", | |
3433 | session->isid[0], session->isid[1], | |
3434 | session->isid[2], session->isid[3], | |
3435 | session->isid[4], session->isid[5]); | |
3436 | break; | |
3437 | case ISCSI_PARAM_DISCOVERY_PARENT_IDX: | |
3438 | len = sprintf(buf, "%u\n", session->discovery_parent_idx); | |
3439 | break; | |
3440 | case ISCSI_PARAM_DISCOVERY_PARENT_TYPE: | |
3441 | if (session->discovery_parent_type) | |
3442 | len = sprintf(buf, "%s\n", | |
3443 | session->discovery_parent_type); | |
3444 | else | |
3445 | len = sprintf(buf, "\n"); | |
3b9373e9 | 3446 | break; |
a54a52ca MC |
3447 | default: |
3448 | return -ENOSYS; | |
3449 | } | |
3450 | ||
3451 | return len; | |
3452 | } | |
3453 | EXPORT_SYMBOL_GPL(iscsi_session_get_param); | |
3454 | ||
00f3708e MC |
3455 | int iscsi_conn_get_addr_param(struct sockaddr_storage *addr, |
3456 | enum iscsi_param param, char *buf) | |
3457 | { | |
3458 | struct sockaddr_in6 *sin6 = NULL; | |
3459 | struct sockaddr_in *sin = NULL; | |
3460 | int len; | |
3461 | ||
3462 | switch (addr->ss_family) { | |
3463 | case AF_INET: | |
3464 | sin = (struct sockaddr_in *)addr; | |
3465 | break; | |
3466 | case AF_INET6: | |
3467 | sin6 = (struct sockaddr_in6 *)addr; | |
3468 | break; | |
3469 | default: | |
3470 | return -EINVAL; | |
3471 | } | |
3472 | ||
3473 | switch (param) { | |
3474 | case ISCSI_PARAM_CONN_ADDRESS: | |
3475 | case ISCSI_HOST_PARAM_IPADDRESS: | |
3476 | if (sin) | |
3477 | len = sprintf(buf, "%pI4\n", &sin->sin_addr.s_addr); | |
3478 | else | |
3479 | len = sprintf(buf, "%pI6\n", &sin6->sin6_addr); | |
3480 | break; | |
3481 | case ISCSI_PARAM_CONN_PORT: | |
4bfb8ebf | 3482 | case ISCSI_PARAM_LOCAL_PORT: |
00f3708e MC |
3483 | if (sin) |
3484 | len = sprintf(buf, "%hu\n", be16_to_cpu(sin->sin_port)); | |
3485 | else | |
3486 | len = sprintf(buf, "%hu\n", | |
3487 | be16_to_cpu(sin6->sin6_port)); | |
3488 | break; | |
3489 | default: | |
3490 | return -EINVAL; | |
3491 | } | |
3492 | ||
3493 | return len; | |
3494 | } | |
3495 | EXPORT_SYMBOL_GPL(iscsi_conn_get_addr_param); | |
3496 | ||
a54a52ca MC |
3497 | int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn, |
3498 | enum iscsi_param param, char *buf) | |
3499 | { | |
3500 | struct iscsi_conn *conn = cls_conn->dd_data; | |
3501 | int len; | |
3502 | ||
3503 | switch(param) { | |
f6d5180c MC |
3504 | case ISCSI_PARAM_PING_TMO: |
3505 | len = sprintf(buf, "%u\n", conn->ping_timeout); | |
3506 | break; | |
3507 | case ISCSI_PARAM_RECV_TMO: | |
3508 | len = sprintf(buf, "%u\n", conn->recv_timeout); | |
3509 | break; | |
a54a52ca MC |
3510 | case ISCSI_PARAM_MAX_RECV_DLENGTH: |
3511 | len = sprintf(buf, "%u\n", conn->max_recv_dlength); | |
3512 | break; | |
3513 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
3514 | len = sprintf(buf, "%u\n", conn->max_xmit_dlength); | |
3515 | break; | |
3516 | case ISCSI_PARAM_HDRDGST_EN: | |
3517 | len = sprintf(buf, "%d\n", conn->hdrdgst_en); | |
3518 | break; | |
3519 | case ISCSI_PARAM_DATADGST_EN: | |
3520 | len = sprintf(buf, "%d\n", conn->datadgst_en); | |
3521 | break; | |
3522 | case ISCSI_PARAM_IFMARKER_EN: | |
3523 | len = sprintf(buf, "%d\n", conn->ifmarker_en); | |
3524 | break; | |
3525 | case ISCSI_PARAM_OFMARKER_EN: | |
3526 | len = sprintf(buf, "%d\n", conn->ofmarker_en); | |
3527 | break; | |
3528 | case ISCSI_PARAM_EXP_STATSN: | |
3529 | len = sprintf(buf, "%u\n", conn->exp_statsn); | |
3530 | break; | |
3531 | case ISCSI_PARAM_PERSISTENT_PORT: | |
3532 | len = sprintf(buf, "%d\n", conn->persistent_port); | |
3533 | break; | |
3534 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
3535 | len = sprintf(buf, "%s\n", conn->persistent_address); | |
3536 | break; | |
f8525eb4 AC |
3537 | case ISCSI_PARAM_STATSN: |
3538 | len = sprintf(buf, "%u\n", conn->statsn); | |
3539 | break; | |
3540 | case ISCSI_PARAM_MAX_SEGMENT_SIZE: | |
3541 | len = sprintf(buf, "%u\n", conn->max_segment_size); | |
3542 | break; | |
3543 | case ISCSI_PARAM_KEEPALIVE_TMO: | |
3544 | len = sprintf(buf, "%u\n", conn->keepalive_tmo); | |
3545 | break; | |
3546 | case ISCSI_PARAM_LOCAL_PORT: | |
3547 | len = sprintf(buf, "%u\n", conn->local_port); | |
3548 | break; | |
3549 | case ISCSI_PARAM_TCP_TIMESTAMP_STAT: | |
3550 | len = sprintf(buf, "%u\n", conn->tcp_timestamp_stat); | |
3551 | break; | |
3552 | case ISCSI_PARAM_TCP_NAGLE_DISABLE: | |
3553 | len = sprintf(buf, "%u\n", conn->tcp_nagle_disable); | |
3554 | break; | |
3555 | case ISCSI_PARAM_TCP_WSF_DISABLE: | |
3556 | len = sprintf(buf, "%u\n", conn->tcp_wsf_disable); | |
3557 | break; | |
3558 | case ISCSI_PARAM_TCP_TIMER_SCALE: | |
3559 | len = sprintf(buf, "%u\n", conn->tcp_timer_scale); | |
3560 | break; | |
3561 | case ISCSI_PARAM_TCP_TIMESTAMP_EN: | |
3562 | len = sprintf(buf, "%u\n", conn->tcp_timestamp_en); | |
3563 | break; | |
3564 | case ISCSI_PARAM_IP_FRAGMENT_DISABLE: | |
3565 | len = sprintf(buf, "%u\n", conn->fragment_disable); | |
3566 | break; | |
3567 | case ISCSI_PARAM_IPV4_TOS: | |
3568 | len = sprintf(buf, "%u\n", conn->ipv4_tos); | |
3569 | break; | |
3570 | case ISCSI_PARAM_IPV6_TC: | |
3571 | len = sprintf(buf, "%u\n", conn->ipv6_traffic_class); | |
3572 | break; | |
5f09e1f3 AC |
3573 | case ISCSI_PARAM_IPV6_FLOW_LABEL: |
3574 | len = sprintf(buf, "%u\n", conn->ipv6_flow_label); | |
3575 | break; | |
f8525eb4 AC |
3576 | case ISCSI_PARAM_IS_FW_ASSIGNED_IPV6: |
3577 | len = sprintf(buf, "%u\n", conn->is_fw_assigned_ipv6); | |
3578 | break; | |
3579 | case ISCSI_PARAM_TCP_XMIT_WSF: | |
3580 | len = sprintf(buf, "%u\n", conn->tcp_xmit_wsf); | |
3581 | break; | |
3582 | case ISCSI_PARAM_TCP_RECV_WSF: | |
3583 | len = sprintf(buf, "%u\n", conn->tcp_recv_wsf); | |
3584 | break; | |
ae56ff40 AC |
3585 | case ISCSI_PARAM_LOCAL_IPADDR: |
3586 | len = sprintf(buf, "%s\n", conn->local_ipaddr); | |
3587 | break; | |
a54a52ca MC |
3588 | default: |
3589 | return -ENOSYS; | |
3590 | } | |
3591 | ||
3592 | return len; | |
3593 | } | |
3594 | EXPORT_SYMBOL_GPL(iscsi_conn_get_param); | |
3595 | ||
0801c242 MC |
3596 | int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param, |
3597 | char *buf) | |
3598 | { | |
75613521 | 3599 | struct iscsi_host *ihost = shost_priv(shost); |
0801c242 MC |
3600 | int len; |
3601 | ||
3602 | switch (param) { | |
d8196ed2 | 3603 | case ISCSI_HOST_PARAM_NETDEV_NAME: |
5700b1af | 3604 | len = sprintf(buf, "%s\n", ihost->netdev); |
d8196ed2 | 3605 | break; |
0801c242 | 3606 | case ISCSI_HOST_PARAM_HWADDRESS: |
5700b1af | 3607 | len = sprintf(buf, "%s\n", ihost->hwaddress); |
0801c242 | 3608 | break; |
8ad5781a | 3609 | case ISCSI_HOST_PARAM_INITIATOR_NAME: |
5700b1af | 3610 | len = sprintf(buf, "%s\n", ihost->initiatorname); |
8ad5781a | 3611 | break; |
0801c242 MC |
3612 | default: |
3613 | return -ENOSYS; | |
3614 | } | |
3615 | ||
3616 | return len; | |
3617 | } | |
3618 | EXPORT_SYMBOL_GPL(iscsi_host_get_param); | |
3619 | ||
3620 | int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param, | |
3621 | char *buf, int buflen) | |
3622 | { | |
75613521 | 3623 | struct iscsi_host *ihost = shost_priv(shost); |
0801c242 MC |
3624 | |
3625 | switch (param) { | |
d8196ed2 | 3626 | case ISCSI_HOST_PARAM_NETDEV_NAME: |
5700b1af | 3627 | return iscsi_switch_str_param(&ihost->netdev, buf); |
0801c242 | 3628 | case ISCSI_HOST_PARAM_HWADDRESS: |
5700b1af | 3629 | return iscsi_switch_str_param(&ihost->hwaddress, buf); |
8ad5781a | 3630 | case ISCSI_HOST_PARAM_INITIATOR_NAME: |
5700b1af | 3631 | return iscsi_switch_str_param(&ihost->initiatorname, buf); |
0801c242 MC |
3632 | default: |
3633 | return -ENOSYS; | |
3634 | } | |
3635 | ||
3636 | return 0; | |
3637 | } | |
3638 | EXPORT_SYMBOL_GPL(iscsi_host_set_param); | |
3639 | ||
7996a778 MC |
3640 | MODULE_AUTHOR("Mike Christie"); |
3641 | MODULE_DESCRIPTION("iSCSI library functions"); | |
3642 | MODULE_LICENSE("GPL"); |