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7996a778 MC |
1 | /* |
2 | * iSCSI lib functions | |
3 | * | |
4 | * Copyright (C) 2006 Red Hat, Inc. All rights reserved. | |
5 | * Copyright (C) 2004 - 2006 Mike Christie | |
6 | * Copyright (C) 2004 - 2005 Dmitry Yusupov | |
7 | * Copyright (C) 2004 - 2005 Alex Aizman | |
8 | * maintained by open-iscsi@googlegroups.com | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
23 | */ | |
24 | #include <linux/types.h> | |
7996a778 MC |
25 | #include <linux/kfifo.h> |
26 | #include <linux/delay.h> | |
11836572 | 27 | #include <linux/log2.h> |
5a0e3ad6 | 28 | #include <linux/slab.h> |
8eb00539 | 29 | #include <asm/unaligned.h> |
7996a778 MC |
30 | #include <net/tcp.h> |
31 | #include <scsi/scsi_cmnd.h> | |
32 | #include <scsi/scsi_device.h> | |
33 | #include <scsi/scsi_eh.h> | |
34 | #include <scsi/scsi_tcq.h> | |
35 | #include <scsi/scsi_host.h> | |
36 | #include <scsi/scsi.h> | |
37 | #include <scsi/iscsi_proto.h> | |
38 | #include <scsi/scsi_transport.h> | |
39 | #include <scsi/scsi_transport_iscsi.h> | |
40 | #include <scsi/libiscsi.h> | |
41 | ||
bd2199d4 EZ |
42 | static int iscsi_dbg_lib_conn; |
43 | module_param_named(debug_libiscsi_conn, iscsi_dbg_lib_conn, int, | |
44 | S_IRUGO | S_IWUSR); | |
45 | MODULE_PARM_DESC(debug_libiscsi_conn, | |
46 | "Turn on debugging for connections in libiscsi module. " | |
47 | "Set to 1 to turn on, and zero to turn off. Default is off."); | |
48 | ||
49 | static int iscsi_dbg_lib_session; | |
50 | module_param_named(debug_libiscsi_session, iscsi_dbg_lib_session, int, | |
51 | S_IRUGO | S_IWUSR); | |
52 | MODULE_PARM_DESC(debug_libiscsi_session, | |
53 | "Turn on debugging for sessions in libiscsi module. " | |
54 | "Set to 1 to turn on, and zero to turn off. Default is off."); | |
55 | ||
56 | static int iscsi_dbg_lib_eh; | |
57 | module_param_named(debug_libiscsi_eh, iscsi_dbg_lib_eh, int, | |
58 | S_IRUGO | S_IWUSR); | |
59 | MODULE_PARM_DESC(debug_libiscsi_eh, | |
60 | "Turn on debugging for error handling in libiscsi module. " | |
61 | "Set to 1 to turn on, and zero to turn off. Default is off."); | |
1b2c7af8 MC |
62 | |
63 | #define ISCSI_DBG_CONN(_conn, dbg_fmt, arg...) \ | |
64 | do { \ | |
bd2199d4 | 65 | if (iscsi_dbg_lib_conn) \ |
1b2c7af8 MC |
66 | iscsi_conn_printk(KERN_INFO, _conn, \ |
67 | "%s " dbg_fmt, \ | |
68 | __func__, ##arg); \ | |
69 | } while (0); | |
70 | ||
71 | #define ISCSI_DBG_SESSION(_session, dbg_fmt, arg...) \ | |
72 | do { \ | |
bd2199d4 EZ |
73 | if (iscsi_dbg_lib_session) \ |
74 | iscsi_session_printk(KERN_INFO, _session, \ | |
75 | "%s " dbg_fmt, \ | |
76 | __func__, ##arg); \ | |
77 | } while (0); | |
78 | ||
79 | #define ISCSI_DBG_EH(_session, dbg_fmt, arg...) \ | |
80 | do { \ | |
81 | if (iscsi_dbg_lib_eh) \ | |
1b2c7af8 MC |
82 | iscsi_session_printk(KERN_INFO, _session, \ |
83 | "%s " dbg_fmt, \ | |
84 | __func__, ##arg); \ | |
85 | } while (0); | |
86 | ||
77a23c21 MC |
87 | /* Serial Number Arithmetic, 32 bits, less than, RFC1982 */ |
88 | #define SNA32_CHECK 2147483648UL | |
7996a778 | 89 | |
77a23c21 MC |
90 | static int iscsi_sna_lt(u32 n1, u32 n2) |
91 | { | |
92 | return n1 != n2 && ((n1 < n2 && (n2 - n1 < SNA32_CHECK)) || | |
93 | (n1 > n2 && (n2 - n1 < SNA32_CHECK))); | |
94 | } | |
95 | ||
96 | /* Serial Number Arithmetic, 32 bits, less than, RFC1982 */ | |
97 | static int iscsi_sna_lte(u32 n1, u32 n2) | |
98 | { | |
99 | return n1 == n2 || ((n1 < n2 && (n2 - n1 < SNA32_CHECK)) || | |
100 | (n1 > n2 && (n2 - n1 < SNA32_CHECK))); | |
101 | } | |
102 | ||
32ae763e MC |
103 | inline void iscsi_conn_queue_work(struct iscsi_conn *conn) |
104 | { | |
105 | struct Scsi_Host *shost = conn->session->host; | |
106 | struct iscsi_host *ihost = shost_priv(shost); | |
107 | ||
1336aed1 MC |
108 | if (ihost->workq) |
109 | queue_work(ihost->workq, &conn->xmitwork); | |
32ae763e MC |
110 | } |
111 | EXPORT_SYMBOL_GPL(iscsi_conn_queue_work); | |
112 | ||
4c0ba5d2 MC |
113 | static void __iscsi_update_cmdsn(struct iscsi_session *session, |
114 | uint32_t exp_cmdsn, uint32_t max_cmdsn) | |
7996a778 | 115 | { |
77a23c21 MC |
116 | /* |
117 | * standard specifies this check for when to update expected and | |
118 | * max sequence numbers | |
119 | */ | |
120 | if (iscsi_sna_lt(max_cmdsn, exp_cmdsn - 1)) | |
121 | return; | |
122 | ||
123 | if (exp_cmdsn != session->exp_cmdsn && | |
124 | !iscsi_sna_lt(exp_cmdsn, session->exp_cmdsn)) | |
7996a778 MC |
125 | session->exp_cmdsn = exp_cmdsn; |
126 | ||
77a23c21 MC |
127 | if (max_cmdsn != session->max_cmdsn && |
128 | !iscsi_sna_lt(max_cmdsn, session->max_cmdsn)) { | |
129 | session->max_cmdsn = max_cmdsn; | |
130 | /* | |
131 | * if the window closed with IO queued, then kick the | |
132 | * xmit thread | |
133 | */ | |
3bbaaad9 | 134 | if (!list_empty(&session->leadconn->cmdqueue) || |
1336aed1 MC |
135 | !list_empty(&session->leadconn->mgmtqueue)) |
136 | iscsi_conn_queue_work(session->leadconn); | |
77a23c21 | 137 | } |
7996a778 | 138 | } |
4c0ba5d2 MC |
139 | |
140 | void iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr) | |
141 | { | |
142 | __iscsi_update_cmdsn(session, be32_to_cpu(hdr->exp_cmdsn), | |
143 | be32_to_cpu(hdr->max_cmdsn)); | |
144 | } | |
77a23c21 | 145 | EXPORT_SYMBOL_GPL(iscsi_update_cmdsn); |
7996a778 | 146 | |
577577da MC |
147 | /** |
148 | * iscsi_prep_data_out_pdu - initialize Data-Out | |
149 | * @task: scsi command task | |
150 | * @r2t: R2T info | |
151 | * @hdr: iscsi data in pdu | |
152 | * | |
153 | * Notes: | |
154 | * Initialize Data-Out within this R2T sequence and finds | |
155 | * proper data_offset within this SCSI command. | |
156 | * | |
157 | * This function is called with connection lock taken. | |
158 | **/ | |
159 | void iscsi_prep_data_out_pdu(struct iscsi_task *task, struct iscsi_r2t_info *r2t, | |
160 | struct iscsi_data *hdr) | |
7996a778 | 161 | { |
9c19a7d0 | 162 | struct iscsi_conn *conn = task->conn; |
577577da MC |
163 | unsigned int left = r2t->data_length - r2t->sent; |
164 | ||
165 | task->hdr_len = sizeof(struct iscsi_data); | |
7996a778 MC |
166 | |
167 | memset(hdr, 0, sizeof(struct iscsi_data)); | |
577577da MC |
168 | hdr->ttt = r2t->ttt; |
169 | hdr->datasn = cpu_to_be32(r2t->datasn); | |
170 | r2t->datasn++; | |
7996a778 | 171 | hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; |
577577da MC |
172 | memcpy(hdr->lun, task->lun, sizeof(hdr->lun)); |
173 | hdr->itt = task->hdr_itt; | |
174 | hdr->exp_statsn = r2t->exp_statsn; | |
175 | hdr->offset = cpu_to_be32(r2t->data_offset + r2t->sent); | |
176 | if (left > conn->max_xmit_dlength) { | |
7996a778 | 177 | hton24(hdr->dlength, conn->max_xmit_dlength); |
577577da | 178 | r2t->data_count = conn->max_xmit_dlength; |
7996a778 MC |
179 | hdr->flags = 0; |
180 | } else { | |
577577da MC |
181 | hton24(hdr->dlength, left); |
182 | r2t->data_count = left; | |
7996a778 MC |
183 | hdr->flags = ISCSI_FLAG_CMD_FINAL; |
184 | } | |
577577da | 185 | conn->dataout_pdus_cnt++; |
7996a778 | 186 | } |
577577da | 187 | EXPORT_SYMBOL_GPL(iscsi_prep_data_out_pdu); |
7996a778 | 188 | |
9c19a7d0 | 189 | static int iscsi_add_hdr(struct iscsi_task *task, unsigned len) |
004d6530 | 190 | { |
9c19a7d0 | 191 | unsigned exp_len = task->hdr_len + len; |
004d6530 | 192 | |
9c19a7d0 | 193 | if (exp_len > task->hdr_max) { |
004d6530 BH |
194 | WARN_ON(1); |
195 | return -EINVAL; | |
196 | } | |
197 | ||
198 | WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */ | |
9c19a7d0 | 199 | task->hdr_len = exp_len; |
004d6530 BH |
200 | return 0; |
201 | } | |
202 | ||
38d1c069 BH |
203 | /* |
204 | * make an extended cdb AHS | |
205 | */ | |
9c19a7d0 | 206 | static int iscsi_prep_ecdb_ahs(struct iscsi_task *task) |
38d1c069 | 207 | { |
9c19a7d0 | 208 | struct scsi_cmnd *cmd = task->sc; |
38d1c069 BH |
209 | unsigned rlen, pad_len; |
210 | unsigned short ahslength; | |
211 | struct iscsi_ecdb_ahdr *ecdb_ahdr; | |
212 | int rc; | |
213 | ||
9c19a7d0 | 214 | ecdb_ahdr = iscsi_next_hdr(task); |
38d1c069 BH |
215 | rlen = cmd->cmd_len - ISCSI_CDB_SIZE; |
216 | ||
217 | BUG_ON(rlen > sizeof(ecdb_ahdr->ecdb)); | |
218 | ahslength = rlen + sizeof(ecdb_ahdr->reserved); | |
219 | ||
220 | pad_len = iscsi_padding(rlen); | |
221 | ||
9c19a7d0 | 222 | rc = iscsi_add_hdr(task, sizeof(ecdb_ahdr->ahslength) + |
38d1c069 BH |
223 | sizeof(ecdb_ahdr->ahstype) + ahslength + pad_len); |
224 | if (rc) | |
225 | return rc; | |
226 | ||
227 | if (pad_len) | |
228 | memset(&ecdb_ahdr->ecdb[rlen], 0, pad_len); | |
229 | ||
230 | ecdb_ahdr->ahslength = cpu_to_be16(ahslength); | |
231 | ecdb_ahdr->ahstype = ISCSI_AHSTYPE_CDB; | |
232 | ecdb_ahdr->reserved = 0; | |
233 | memcpy(ecdb_ahdr->ecdb, cmd->cmnd + ISCSI_CDB_SIZE, rlen); | |
234 | ||
1b2c7af8 MC |
235 | ISCSI_DBG_SESSION(task->conn->session, |
236 | "iscsi_prep_ecdb_ahs: varlen_cdb_len %d " | |
237 | "rlen %d pad_len %d ahs_length %d iscsi_headers_size " | |
238 | "%u\n", cmd->cmd_len, rlen, pad_len, ahslength, | |
239 | task->hdr_len); | |
38d1c069 BH |
240 | return 0; |
241 | } | |
242 | ||
9c19a7d0 | 243 | static int iscsi_prep_bidi_ahs(struct iscsi_task *task) |
c07d4444 | 244 | { |
9c19a7d0 | 245 | struct scsi_cmnd *sc = task->sc; |
c07d4444 BH |
246 | struct iscsi_rlength_ahdr *rlen_ahdr; |
247 | int rc; | |
248 | ||
9c19a7d0 MC |
249 | rlen_ahdr = iscsi_next_hdr(task); |
250 | rc = iscsi_add_hdr(task, sizeof(*rlen_ahdr)); | |
c07d4444 BH |
251 | if (rc) |
252 | return rc; | |
253 | ||
254 | rlen_ahdr->ahslength = | |
255 | cpu_to_be16(sizeof(rlen_ahdr->read_length) + | |
256 | sizeof(rlen_ahdr->reserved)); | |
257 | rlen_ahdr->ahstype = ISCSI_AHSTYPE_RLENGTH; | |
258 | rlen_ahdr->reserved = 0; | |
259 | rlen_ahdr->read_length = cpu_to_be32(scsi_in(sc)->length); | |
260 | ||
1b2c7af8 MC |
261 | ISCSI_DBG_SESSION(task->conn->session, |
262 | "bidi-in rlen_ahdr->read_length(%d) " | |
263 | "rlen_ahdr->ahslength(%d)\n", | |
264 | be32_to_cpu(rlen_ahdr->read_length), | |
265 | be16_to_cpu(rlen_ahdr->ahslength)); | |
c07d4444 BH |
266 | return 0; |
267 | } | |
268 | ||
5d12c05e MC |
269 | /** |
270 | * iscsi_check_tmf_restrictions - check if a task is affected by TMF | |
271 | * @task: iscsi task | |
272 | * @opcode: opcode to check for | |
273 | * | |
274 | * During TMF a task has to be checked if it's affected. | |
275 | * All unrelated I/O can be passed through, but I/O to the | |
276 | * affected LUN should be restricted. | |
277 | * If 'fast_abort' is set we won't be sending any I/O to the | |
278 | * affected LUN. | |
279 | * Otherwise the target is waiting for all TTTs to be completed, | |
280 | * so we have to send all outstanding Data-Out PDUs to the target. | |
281 | */ | |
282 | static int iscsi_check_tmf_restrictions(struct iscsi_task *task, int opcode) | |
283 | { | |
284 | struct iscsi_conn *conn = task->conn; | |
285 | struct iscsi_tm *tmf = &conn->tmhdr; | |
286 | unsigned int hdr_lun; | |
287 | ||
288 | if (conn->tmf_state == TMF_INITIAL) | |
289 | return 0; | |
290 | ||
291 | if ((tmf->opcode & ISCSI_OPCODE_MASK) != ISCSI_OP_SCSI_TMFUNC) | |
292 | return 0; | |
293 | ||
294 | switch (ISCSI_TM_FUNC_VALUE(tmf)) { | |
295 | case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: | |
296 | /* | |
297 | * Allow PDUs for unrelated LUNs | |
298 | */ | |
299 | hdr_lun = scsilun_to_int((struct scsi_lun *)tmf->lun); | |
300 | if (hdr_lun != task->sc->device->lun) | |
301 | return 0; | |
3fe5ae8b MC |
302 | /* fall through */ |
303 | case ISCSI_TM_FUNC_TARGET_WARM_RESET: | |
5d12c05e MC |
304 | /* |
305 | * Fail all SCSI cmd PDUs | |
306 | */ | |
307 | if (opcode != ISCSI_OP_SCSI_DATA_OUT) { | |
308 | iscsi_conn_printk(KERN_INFO, conn, | |
309 | "task [op %x/%x itt " | |
3fe5ae8b | 310 | "0x%x/0x%x] " |
5d12c05e MC |
311 | "rejected.\n", |
312 | task->hdr->opcode, opcode, | |
3fe5ae8b | 313 | task->itt, task->hdr_itt); |
5d12c05e MC |
314 | return -EACCES; |
315 | } | |
316 | /* | |
317 | * And also all data-out PDUs in response to R2T | |
318 | * if fast_abort is set. | |
319 | */ | |
320 | if (conn->session->fast_abort) { | |
321 | iscsi_conn_printk(KERN_INFO, conn, | |
322 | "task [op %x/%x itt " | |
3fe5ae8b | 323 | "0x%x/0x%x] fast abort.\n", |
5d12c05e | 324 | task->hdr->opcode, opcode, |
3fe5ae8b | 325 | task->itt, task->hdr_itt); |
5d12c05e MC |
326 | return -EACCES; |
327 | } | |
328 | break; | |
329 | case ISCSI_TM_FUNC_ABORT_TASK: | |
330 | /* | |
331 | * the caller has already checked if the task | |
332 | * they want to abort was in the pending queue so if | |
333 | * we are here the cmd pdu has gone out already, and | |
334 | * we will only hit this for data-outs | |
335 | */ | |
336 | if (opcode == ISCSI_OP_SCSI_DATA_OUT && | |
337 | task->hdr_itt == tmf->rtt) { | |
338 | ISCSI_DBG_SESSION(conn->session, | |
339 | "Preventing task %x/%x from sending " | |
340 | "data-out due to abort task in " | |
341 | "progress\n", task->itt, | |
342 | task->hdr_itt); | |
343 | return -EACCES; | |
344 | } | |
345 | break; | |
346 | } | |
347 | ||
348 | return 0; | |
349 | } | |
350 | ||
7996a778 MC |
351 | /** |
352 | * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu | |
9c19a7d0 | 353 | * @task: iscsi task |
7996a778 MC |
354 | * |
355 | * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set | |
356 | * fields like dlength or final based on how much data it sends | |
357 | */ | |
9c19a7d0 | 358 | static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task) |
7996a778 | 359 | { |
9c19a7d0 | 360 | struct iscsi_conn *conn = task->conn; |
7996a778 | 361 | struct iscsi_session *session = conn->session; |
9c19a7d0 | 362 | struct scsi_cmnd *sc = task->sc; |
577577da | 363 | struct iscsi_cmd *hdr; |
38d1c069 | 364 | unsigned hdrlength, cmd_len; |
262ef636 | 365 | itt_t itt; |
004d6530 | 366 | int rc; |
7996a778 | 367 | |
5d12c05e MC |
368 | rc = iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_CMD); |
369 | if (rc) | |
370 | return rc; | |
371 | ||
184b57c6 MC |
372 | if (conn->session->tt->alloc_pdu) { |
373 | rc = conn->session->tt->alloc_pdu(task, ISCSI_OP_SCSI_CMD); | |
374 | if (rc) | |
375 | return rc; | |
376 | } | |
577577da | 377 | hdr = (struct iscsi_cmd *) task->hdr; |
262ef636 | 378 | itt = hdr->itt; |
577577da MC |
379 | memset(hdr, 0, sizeof(*hdr)); |
380 | ||
2ff79d52 MC |
381 | if (session->tt->parse_pdu_itt) |
382 | hdr->itt = task->hdr_itt = itt; | |
383 | else | |
384 | hdr->itt = task->hdr_itt = build_itt(task->itt, | |
385 | task->conn->session->age); | |
9c19a7d0 MC |
386 | task->hdr_len = 0; |
387 | rc = iscsi_add_hdr(task, sizeof(*hdr)); | |
004d6530 BH |
388 | if (rc) |
389 | return rc; | |
a8ac6311 OK |
390 | hdr->opcode = ISCSI_OP_SCSI_CMD; |
391 | hdr->flags = ISCSI_ATTR_SIMPLE; | |
392 | int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun); | |
577577da | 393 | memcpy(task->lun, hdr->lun, sizeof(task->lun)); |
a8ac6311 | 394 | hdr->exp_statsn = cpu_to_be32(conn->exp_statsn); |
38d1c069 BH |
395 | cmd_len = sc->cmd_len; |
396 | if (cmd_len < ISCSI_CDB_SIZE) | |
397 | memset(&hdr->cdb[cmd_len], 0, ISCSI_CDB_SIZE - cmd_len); | |
398 | else if (cmd_len > ISCSI_CDB_SIZE) { | |
9c19a7d0 | 399 | rc = iscsi_prep_ecdb_ahs(task); |
38d1c069 BH |
400 | if (rc) |
401 | return rc; | |
402 | cmd_len = ISCSI_CDB_SIZE; | |
403 | } | |
404 | memcpy(hdr->cdb, sc->cmnd, cmd_len); | |
7996a778 | 405 | |
9c19a7d0 | 406 | task->imm_count = 0; |
c07d4444 BH |
407 | if (scsi_bidi_cmnd(sc)) { |
408 | hdr->flags |= ISCSI_FLAG_CMD_READ; | |
9c19a7d0 | 409 | rc = iscsi_prep_bidi_ahs(task); |
c07d4444 BH |
410 | if (rc) |
411 | return rc; | |
412 | } | |
7996a778 | 413 | if (sc->sc_data_direction == DMA_TO_DEVICE) { |
c07d4444 | 414 | unsigned out_len = scsi_out(sc)->length; |
577577da MC |
415 | struct iscsi_r2t_info *r2t = &task->unsol_r2t; |
416 | ||
c07d4444 | 417 | hdr->data_length = cpu_to_be32(out_len); |
7996a778 MC |
418 | hdr->flags |= ISCSI_FLAG_CMD_WRITE; |
419 | /* | |
420 | * Write counters: | |
421 | * | |
422 | * imm_count bytes to be sent right after | |
423 | * SCSI PDU Header | |
424 | * | |
425 | * unsol_count bytes(as Data-Out) to be sent | |
426 | * without R2T ack right after | |
427 | * immediate data | |
428 | * | |
577577da | 429 | * r2t data_length bytes to be sent via R2T ack's |
7996a778 MC |
430 | * |
431 | * pad_count bytes to be sent as zero-padding | |
432 | */ | |
577577da | 433 | memset(r2t, 0, sizeof(*r2t)); |
7996a778 MC |
434 | |
435 | if (session->imm_data_en) { | |
c07d4444 | 436 | if (out_len >= session->first_burst) |
9c19a7d0 | 437 | task->imm_count = min(session->first_burst, |
7996a778 MC |
438 | conn->max_xmit_dlength); |
439 | else | |
9c19a7d0 | 440 | task->imm_count = min(out_len, |
7996a778 | 441 | conn->max_xmit_dlength); |
9c19a7d0 | 442 | hton24(hdr->dlength, task->imm_count); |
7996a778 | 443 | } else |
a8ac6311 | 444 | zero_data(hdr->dlength); |
7996a778 | 445 | |
ffd0436e | 446 | if (!session->initial_r2t_en) { |
577577da MC |
447 | r2t->data_length = min(session->first_burst, out_len) - |
448 | task->imm_count; | |
449 | r2t->data_offset = task->imm_count; | |
450 | r2t->ttt = cpu_to_be32(ISCSI_RESERVED_TAG); | |
451 | r2t->exp_statsn = cpu_to_be32(conn->exp_statsn); | |
ffd0436e MC |
452 | } |
453 | ||
577577da | 454 | if (!task->unsol_r2t.data_length) |
7996a778 | 455 | /* No unsolicit Data-Out's */ |
a8ac6311 | 456 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; |
7996a778 | 457 | } else { |
7996a778 MC |
458 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; |
459 | zero_data(hdr->dlength); | |
c07d4444 | 460 | hdr->data_length = cpu_to_be32(scsi_in(sc)->length); |
7996a778 MC |
461 | |
462 | if (sc->sc_data_direction == DMA_FROM_DEVICE) | |
463 | hdr->flags |= ISCSI_FLAG_CMD_READ; | |
464 | } | |
465 | ||
004d6530 | 466 | /* calculate size of additional header segments (AHSs) */ |
9c19a7d0 | 467 | hdrlength = task->hdr_len - sizeof(*hdr); |
004d6530 BH |
468 | |
469 | WARN_ON(hdrlength & (ISCSI_PAD_LEN-1)); | |
470 | hdrlength /= ISCSI_PAD_LEN; | |
471 | ||
472 | WARN_ON(hdrlength >= 256); | |
473 | hdr->hlength = hdrlength & 0xFF; | |
474 | ||
577577da | 475 | if (session->tt->init_task && session->tt->init_task(task)) |
052d0144 MC |
476 | return -EIO; |
477 | ||
9c19a7d0 | 478 | task->state = ISCSI_TASK_RUNNING; |
d3305f34 MC |
479 | hdr->cmdsn = task->cmdsn = cpu_to_be32(session->cmdsn); |
480 | session->cmdsn++; | |
77a23c21 | 481 | |
a8ac6311 | 482 | conn->scsicmd_pdus_cnt++; |
1b2c7af8 MC |
483 | ISCSI_DBG_SESSION(session, "iscsi prep [%s cid %d sc %p cdb 0x%x " |
484 | "itt 0x%x len %d bidi_len %d cmdsn %d win %d]\n", | |
485 | scsi_bidi_cmnd(sc) ? "bidirectional" : | |
486 | sc->sc_data_direction == DMA_TO_DEVICE ? | |
487 | "write" : "read", conn->id, sc, sc->cmnd[0], | |
488 | task->itt, scsi_bufflen(sc), | |
489 | scsi_bidi_cmnd(sc) ? scsi_in(sc)->length : 0, | |
490 | session->cmdsn, | |
491 | session->max_cmdsn - session->exp_cmdsn + 1); | |
004d6530 | 492 | return 0; |
7996a778 | 493 | } |
7996a778 MC |
494 | |
495 | /** | |
3bbaaad9 | 496 | * iscsi_free_task - free a task |
9c19a7d0 | 497 | * @task: iscsi cmd task |
7996a778 MC |
498 | * |
499 | * Must be called with session lock. | |
3e5c28ad MC |
500 | * This function returns the scsi command to scsi-ml or cleans |
501 | * up mgmt tasks then returns the task to the pool. | |
7996a778 | 502 | */ |
3bbaaad9 | 503 | static void iscsi_free_task(struct iscsi_task *task) |
7996a778 | 504 | { |
9c19a7d0 | 505 | struct iscsi_conn *conn = task->conn; |
c1635cb7 | 506 | struct iscsi_session *session = conn->session; |
9c19a7d0 | 507 | struct scsi_cmnd *sc = task->sc; |
7996a778 | 508 | |
4421c9eb MC |
509 | ISCSI_DBG_SESSION(session, "freeing task itt 0x%x state %d sc %p\n", |
510 | task->itt, task->state, task->sc); | |
511 | ||
577577da | 512 | session->tt->cleanup_task(task); |
3bbaaad9 | 513 | task->state = ISCSI_TASK_FREE; |
9c19a7d0 | 514 | task->sc = NULL; |
3e5c28ad | 515 | /* |
9c19a7d0 | 516 | * login task is preallocated so do not free |
3e5c28ad | 517 | */ |
9c19a7d0 | 518 | if (conn->login_task == task) |
3e5c28ad MC |
519 | return; |
520 | ||
7acd72eb | 521 | kfifo_in(&session->cmdpool.queue, (void*)&task, sizeof(void*)); |
052d0144 | 522 | |
3e5c28ad | 523 | if (sc) { |
9c19a7d0 | 524 | task->sc = NULL; |
3e5c28ad MC |
525 | /* SCSI eh reuses commands to verify us */ |
526 | sc->SCp.ptr = NULL; | |
527 | /* | |
528 | * queue command may call this to free the task, but | |
529 | * not have setup the sc callback | |
530 | */ | |
531 | if (sc->scsi_done) | |
532 | sc->scsi_done(sc); | |
533 | } | |
7996a778 MC |
534 | } |
535 | ||
913e5bf4 | 536 | void __iscsi_get_task(struct iscsi_task *task) |
60ecebf5 | 537 | { |
9c19a7d0 | 538 | atomic_inc(&task->refcount); |
60ecebf5 | 539 | } |
913e5bf4 | 540 | EXPORT_SYMBOL_GPL(__iscsi_get_task); |
60ecebf5 | 541 | |
9c19a7d0 | 542 | static void __iscsi_put_task(struct iscsi_task *task) |
60ecebf5 | 543 | { |
9c19a7d0 | 544 | if (atomic_dec_and_test(&task->refcount)) |
3bbaaad9 | 545 | iscsi_free_task(task); |
60ecebf5 MC |
546 | } |
547 | ||
9c19a7d0 | 548 | void iscsi_put_task(struct iscsi_task *task) |
3e5c28ad | 549 | { |
9c19a7d0 | 550 | struct iscsi_session *session = task->conn->session; |
3e5c28ad MC |
551 | |
552 | spin_lock_bh(&session->lock); | |
9c19a7d0 | 553 | __iscsi_put_task(task); |
3e5c28ad MC |
554 | spin_unlock_bh(&session->lock); |
555 | } | |
9c19a7d0 | 556 | EXPORT_SYMBOL_GPL(iscsi_put_task); |
3e5c28ad | 557 | |
3bbaaad9 MC |
558 | /** |
559 | * iscsi_complete_task - finish a task | |
560 | * @task: iscsi cmd task | |
b3cd5050 | 561 | * @state: state to complete task with |
3bbaaad9 MC |
562 | * |
563 | * Must be called with session lock. | |
564 | */ | |
b3cd5050 | 565 | static void iscsi_complete_task(struct iscsi_task *task, int state) |
3bbaaad9 MC |
566 | { |
567 | struct iscsi_conn *conn = task->conn; | |
568 | ||
4421c9eb MC |
569 | ISCSI_DBG_SESSION(conn->session, |
570 | "complete task itt 0x%x state %d sc %p\n", | |
571 | task->itt, task->state, task->sc); | |
b3cd5050 MC |
572 | if (task->state == ISCSI_TASK_COMPLETED || |
573 | task->state == ISCSI_TASK_ABRT_TMF || | |
574 | task->state == ISCSI_TASK_ABRT_SESS_RECOV) | |
3bbaaad9 MC |
575 | return; |
576 | WARN_ON_ONCE(task->state == ISCSI_TASK_FREE); | |
b3cd5050 | 577 | task->state = state; |
3bbaaad9 MC |
578 | |
579 | if (!list_empty(&task->running)) | |
580 | list_del_init(&task->running); | |
581 | ||
582 | if (conn->task == task) | |
583 | conn->task = NULL; | |
584 | ||
585 | if (conn->ping_task == task) | |
586 | conn->ping_task = NULL; | |
587 | ||
588 | /* release get from queueing */ | |
589 | __iscsi_put_task(task); | |
590 | } | |
591 | ||
4c0ba5d2 MC |
592 | /** |
593 | * iscsi_complete_scsi_task - finish scsi task normally | |
594 | * @task: iscsi task for scsi cmd | |
595 | * @exp_cmdsn: expected cmd sn in cpu format | |
596 | * @max_cmdsn: max cmd sn in cpu format | |
597 | * | |
598 | * This is used when drivers do not need or cannot perform | |
599 | * lower level pdu processing. | |
600 | * | |
601 | * Called with session lock | |
602 | */ | |
603 | void iscsi_complete_scsi_task(struct iscsi_task *task, | |
604 | uint32_t exp_cmdsn, uint32_t max_cmdsn) | |
605 | { | |
606 | struct iscsi_conn *conn = task->conn; | |
607 | ||
608 | ISCSI_DBG_SESSION(conn->session, "[itt 0x%x]\n", task->itt); | |
609 | ||
610 | conn->last_recv = jiffies; | |
611 | __iscsi_update_cmdsn(conn->session, exp_cmdsn, max_cmdsn); | |
612 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); | |
613 | } | |
614 | EXPORT_SYMBOL_GPL(iscsi_complete_scsi_task); | |
615 | ||
616 | ||
b3a7ea8d | 617 | /* |
3bbaaad9 MC |
618 | * session lock must be held and if not called for a task that is |
619 | * still pending or from the xmit thread, then xmit thread must | |
620 | * be suspended. | |
b3a7ea8d | 621 | */ |
3bbaaad9 | 622 | static void fail_scsi_task(struct iscsi_task *task, int err) |
b3a7ea8d | 623 | { |
3bbaaad9 | 624 | struct iscsi_conn *conn = task->conn; |
b3a7ea8d | 625 | struct scsi_cmnd *sc; |
b3cd5050 | 626 | int state; |
b3a7ea8d | 627 | |
3bbaaad9 MC |
628 | /* |
629 | * if a command completes and we get a successful tmf response | |
630 | * we will hit this because the scsi eh abort code does not take | |
631 | * a ref to the task. | |
632 | */ | |
9c19a7d0 | 633 | sc = task->sc; |
b3a7ea8d MC |
634 | if (!sc) |
635 | return; | |
636 | ||
b3cd5050 | 637 | if (task->state == ISCSI_TASK_PENDING) { |
b3a7ea8d MC |
638 | /* |
639 | * cmd never made it to the xmit thread, so we should not count | |
640 | * the cmd in the sequencing | |
641 | */ | |
642 | conn->session->queued_cmdsn--; | |
b3cd5050 MC |
643 | /* it was never sent so just complete like normal */ |
644 | state = ISCSI_TASK_COMPLETED; | |
645 | } else if (err == DID_TRANSPORT_DISRUPTED) | |
646 | state = ISCSI_TASK_ABRT_SESS_RECOV; | |
647 | else | |
648 | state = ISCSI_TASK_ABRT_TMF; | |
b3a7ea8d | 649 | |
b3cd5050 | 650 | sc->result = err << 16; |
c07d4444 BH |
651 | if (!scsi_bidi_cmnd(sc)) |
652 | scsi_set_resid(sc, scsi_bufflen(sc)); | |
653 | else { | |
654 | scsi_out(sc)->resid = scsi_out(sc)->length; | |
655 | scsi_in(sc)->resid = scsi_in(sc)->length; | |
656 | } | |
3e5c28ad | 657 | |
b3cd5050 | 658 | iscsi_complete_task(task, state); |
b3a7ea8d MC |
659 | } |
660 | ||
3e5c28ad | 661 | static int iscsi_prep_mgmt_task(struct iscsi_conn *conn, |
9c19a7d0 | 662 | struct iscsi_task *task) |
052d0144 MC |
663 | { |
664 | struct iscsi_session *session = conn->session; | |
577577da | 665 | struct iscsi_hdr *hdr = task->hdr; |
052d0144 | 666 | struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr; |
4f704dc0 | 667 | uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK; |
052d0144 MC |
668 | |
669 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) | |
670 | return -ENOTCONN; | |
671 | ||
4f704dc0 | 672 | if (opcode != ISCSI_OP_LOGIN && opcode != ISCSI_OP_TEXT) |
052d0144 MC |
673 | nop->exp_statsn = cpu_to_be32(conn->exp_statsn); |
674 | /* | |
675 | * pre-format CmdSN for outgoing PDU. | |
676 | */ | |
677 | nop->cmdsn = cpu_to_be32(session->cmdsn); | |
678 | if (hdr->itt != RESERVED_ITT) { | |
052d0144 | 679 | /* |
4f704dc0 | 680 | * TODO: We always use immediate for normal session pdus. |
052d0144 MC |
681 | * If we start to send tmfs or nops as non-immediate then |
682 | * we should start checking the cmdsn numbers for mgmt tasks. | |
4f704dc0 MC |
683 | * |
684 | * During discovery sessions iscsid sends TEXT as non immediate, | |
685 | * but we always only send one PDU at a time. | |
052d0144 MC |
686 | */ |
687 | if (conn->c_stage == ISCSI_CONN_STARTED && | |
688 | !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { | |
689 | session->queued_cmdsn++; | |
690 | session->cmdsn++; | |
691 | } | |
692 | } | |
693 | ||
ae15f801 MC |
694 | if (session->tt->init_task && session->tt->init_task(task)) |
695 | return -EIO; | |
052d0144 MC |
696 | |
697 | if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT) | |
698 | session->state = ISCSI_STATE_LOGGING_OUT; | |
699 | ||
577577da | 700 | task->state = ISCSI_TASK_RUNNING; |
1b2c7af8 MC |
701 | ISCSI_DBG_SESSION(session, "mgmtpdu [op 0x%x hdr->itt 0x%x " |
702 | "datalen %d]\n", hdr->opcode & ISCSI_OPCODE_MASK, | |
703 | hdr->itt, task->data_count); | |
052d0144 MC |
704 | return 0; |
705 | } | |
706 | ||
9c19a7d0 | 707 | static struct iscsi_task * |
f6d5180c MC |
708 | __iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
709 | char *data, uint32_t data_size) | |
710 | { | |
711 | struct iscsi_session *session = conn->session; | |
1336aed1 | 712 | struct iscsi_host *ihost = shost_priv(session->host); |
4f704dc0 | 713 | uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK; |
9c19a7d0 | 714 | struct iscsi_task *task; |
262ef636 | 715 | itt_t itt; |
f6d5180c MC |
716 | |
717 | if (session->state == ISCSI_STATE_TERMINATE) | |
718 | return NULL; | |
719 | ||
4f704dc0 | 720 | if (opcode == ISCSI_OP_LOGIN || opcode == ISCSI_OP_TEXT) { |
f6d5180c MC |
721 | /* |
722 | * Login and Text are sent serially, in | |
723 | * request-followed-by-response sequence. | |
3e5c28ad MC |
724 | * Same task can be used. Same ITT must be used. |
725 | * Note that login_task is preallocated at conn_create(). | |
f6d5180c | 726 | */ |
4f704dc0 MC |
727 | if (conn->login_task->state != ISCSI_TASK_FREE) { |
728 | iscsi_conn_printk(KERN_ERR, conn, "Login/Text in " | |
729 | "progress. Cannot start new task.\n"); | |
730 | return NULL; | |
731 | } | |
732 | ||
9c19a7d0 | 733 | task = conn->login_task; |
4f704dc0 | 734 | } else { |
26013ad4 MC |
735 | if (session->state != ISCSI_STATE_LOGGED_IN) |
736 | return NULL; | |
737 | ||
f6d5180c MC |
738 | BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE); |
739 | BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED); | |
740 | ||
7acd72eb | 741 | if (!kfifo_out(&session->cmdpool.queue, |
9c19a7d0 | 742 | (void*)&task, sizeof(void*))) |
f6d5180c MC |
743 | return NULL; |
744 | } | |
3e5c28ad MC |
745 | /* |
746 | * released in complete pdu for task we expect a response for, and | |
747 | * released by the lld when it has transmitted the task for | |
748 | * pdus we do not expect a response for. | |
749 | */ | |
9c19a7d0 MC |
750 | atomic_set(&task->refcount, 1); |
751 | task->conn = conn; | |
752 | task->sc = NULL; | |
3bbaaad9 MC |
753 | INIT_LIST_HEAD(&task->running); |
754 | task->state = ISCSI_TASK_PENDING; | |
f6d5180c MC |
755 | |
756 | if (data_size) { | |
9c19a7d0 MC |
757 | memcpy(task->data, data, data_size); |
758 | task->data_count = data_size; | |
f6d5180c | 759 | } else |
9c19a7d0 | 760 | task->data_count = 0; |
f6d5180c | 761 | |
184b57c6 MC |
762 | if (conn->session->tt->alloc_pdu) { |
763 | if (conn->session->tt->alloc_pdu(task, hdr->opcode)) { | |
764 | iscsi_conn_printk(KERN_ERR, conn, "Could not allocate " | |
765 | "pdu for mgmt task.\n"); | |
3bbaaad9 | 766 | goto free_task; |
184b57c6 | 767 | } |
577577da | 768 | } |
184b57c6 | 769 | |
262ef636 | 770 | itt = task->hdr->itt; |
577577da | 771 | task->hdr_len = sizeof(struct iscsi_hdr); |
9c19a7d0 | 772 | memcpy(task->hdr, hdr, sizeof(struct iscsi_hdr)); |
262ef636 MC |
773 | |
774 | if (hdr->itt != RESERVED_ITT) { | |
775 | if (session->tt->parse_pdu_itt) | |
776 | task->hdr->itt = itt; | |
777 | else | |
778 | task->hdr->itt = build_itt(task->itt, | |
779 | task->conn->session->age); | |
780 | } | |
781 | ||
1336aed1 | 782 | if (!ihost->workq) { |
577577da MC |
783 | if (iscsi_prep_mgmt_task(conn, task)) |
784 | goto free_task; | |
052d0144 | 785 | |
9c19a7d0 | 786 | if (session->tt->xmit_task(task)) |
577577da | 787 | goto free_task; |
3bbaaad9 MC |
788 | } else { |
789 | list_add_tail(&task->running, &conn->mgmtqueue); | |
32ae763e | 790 | iscsi_conn_queue_work(conn); |
3bbaaad9 | 791 | } |
052d0144 | 792 | |
9c19a7d0 | 793 | return task; |
577577da MC |
794 | |
795 | free_task: | |
796 | __iscsi_put_task(task); | |
797 | return NULL; | |
f6d5180c MC |
798 | } |
799 | ||
800 | int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr, | |
801 | char *data, uint32_t data_size) | |
802 | { | |
803 | struct iscsi_conn *conn = cls_conn->dd_data; | |
804 | struct iscsi_session *session = conn->session; | |
805 | int err = 0; | |
806 | ||
807 | spin_lock_bh(&session->lock); | |
808 | if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size)) | |
809 | err = -EPERM; | |
810 | spin_unlock_bh(&session->lock); | |
f6d5180c MC |
811 | return err; |
812 | } | |
813 | EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu); | |
814 | ||
7996a778 MC |
815 | /** |
816 | * iscsi_cmd_rsp - SCSI Command Response processing | |
817 | * @conn: iscsi connection | |
818 | * @hdr: iscsi header | |
9c19a7d0 | 819 | * @task: scsi command task |
7996a778 MC |
820 | * @data: cmd data buffer |
821 | * @datalen: len of buffer | |
822 | * | |
823 | * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and | |
9c19a7d0 | 824 | * then completes the command and task. |
7996a778 | 825 | **/ |
77a23c21 | 826 | static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
9c19a7d0 | 827 | struct iscsi_task *task, char *data, |
77a23c21 | 828 | int datalen) |
7996a778 | 829 | { |
7996a778 MC |
830 | struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)hdr; |
831 | struct iscsi_session *session = conn->session; | |
9c19a7d0 | 832 | struct scsi_cmnd *sc = task->sc; |
7996a778 | 833 | |
77a23c21 | 834 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr); |
7996a778 MC |
835 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; |
836 | ||
837 | sc->result = (DID_OK << 16) | rhdr->cmd_status; | |
838 | ||
839 | if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) { | |
840 | sc->result = DID_ERROR << 16; | |
841 | goto out; | |
842 | } | |
843 | ||
844 | if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) { | |
9b80cb4b | 845 | uint16_t senselen; |
7996a778 MC |
846 | |
847 | if (datalen < 2) { | |
848 | invalid_datalen: | |
322d739d MC |
849 | iscsi_conn_printk(KERN_ERR, conn, |
850 | "Got CHECK_CONDITION but invalid data " | |
851 | "buffer size of %d\n", datalen); | |
7996a778 MC |
852 | sc->result = DID_BAD_TARGET << 16; |
853 | goto out; | |
854 | } | |
855 | ||
8f333991 | 856 | senselen = get_unaligned_be16(data); |
7996a778 MC |
857 | if (datalen < senselen) |
858 | goto invalid_datalen; | |
859 | ||
860 | memcpy(sc->sense_buffer, data + 2, | |
9b80cb4b | 861 | min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE)); |
1b2c7af8 MC |
862 | ISCSI_DBG_SESSION(session, "copied %d bytes of sense\n", |
863 | min_t(uint16_t, senselen, | |
864 | SCSI_SENSE_BUFFERSIZE)); | |
7996a778 MC |
865 | } |
866 | ||
c07d4444 BH |
867 | if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW | |
868 | ISCSI_FLAG_CMD_BIDI_OVERFLOW)) { | |
869 | int res_count = be32_to_cpu(rhdr->bi_residual_count); | |
870 | ||
871 | if (scsi_bidi_cmnd(sc) && res_count > 0 && | |
872 | (rhdr->flags & ISCSI_FLAG_CMD_BIDI_OVERFLOW || | |
873 | res_count <= scsi_in(sc)->length)) | |
874 | scsi_in(sc)->resid = res_count; | |
875 | else | |
876 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
877 | } | |
878 | ||
7207fea4 BH |
879 | if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW | |
880 | ISCSI_FLAG_CMD_OVERFLOW)) { | |
7996a778 MC |
881 | int res_count = be32_to_cpu(rhdr->residual_count); |
882 | ||
7207fea4 BH |
883 | if (res_count > 0 && |
884 | (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || | |
885 | res_count <= scsi_bufflen(sc))) | |
c07d4444 | 886 | /* write side for bidi or uni-io set_resid */ |
1c138991 | 887 | scsi_set_resid(sc, res_count); |
7996a778 MC |
888 | else |
889 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
c07d4444 | 890 | } |
7996a778 | 891 | out: |
3bbaaad9 | 892 | ISCSI_DBG_SESSION(session, "cmd rsp done [sc %p res %d itt 0x%x]\n", |
1b2c7af8 | 893 | sc, sc->result, task->itt); |
7996a778 | 894 | conn->scsirsp_pdus_cnt++; |
b3cd5050 | 895 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); |
7996a778 MC |
896 | } |
897 | ||
1d9edf02 MC |
898 | /** |
899 | * iscsi_data_in_rsp - SCSI Data-In Response processing | |
900 | * @conn: iscsi connection | |
901 | * @hdr: iscsi pdu | |
902 | * @task: scsi command task | |
903 | **/ | |
904 | static void | |
905 | iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
906 | struct iscsi_task *task) | |
907 | { | |
908 | struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)hdr; | |
909 | struct scsi_cmnd *sc = task->sc; | |
910 | ||
911 | if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS)) | |
912 | return; | |
913 | ||
edbc9aa0 | 914 | iscsi_update_cmdsn(conn->session, (struct iscsi_nopin *)hdr); |
1d9edf02 MC |
915 | sc->result = (DID_OK << 16) | rhdr->cmd_status; |
916 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; | |
917 | if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW | | |
918 | ISCSI_FLAG_DATA_OVERFLOW)) { | |
919 | int res_count = be32_to_cpu(rhdr->residual_count); | |
920 | ||
921 | if (res_count > 0 && | |
922 | (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || | |
923 | res_count <= scsi_in(sc)->length)) | |
924 | scsi_in(sc)->resid = res_count; | |
925 | else | |
926 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
927 | } | |
928 | ||
3bbaaad9 MC |
929 | ISCSI_DBG_SESSION(conn->session, "data in with status done " |
930 | "[sc %p res %d itt 0x%x]\n", | |
931 | sc, sc->result, task->itt); | |
1d9edf02 | 932 | conn->scsirsp_pdus_cnt++; |
b3cd5050 | 933 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); |
1d9edf02 MC |
934 | } |
935 | ||
7ea8b828 MC |
936 | static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr) |
937 | { | |
938 | struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr; | |
939 | ||
940 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
941 | conn->tmfrsp_pdus_cnt++; | |
942 | ||
843c0a8a | 943 | if (conn->tmf_state != TMF_QUEUED) |
7ea8b828 MC |
944 | return; |
945 | ||
946 | if (tmf->response == ISCSI_TMF_RSP_COMPLETE) | |
843c0a8a | 947 | conn->tmf_state = TMF_SUCCESS; |
7ea8b828 | 948 | else if (tmf->response == ISCSI_TMF_RSP_NO_TASK) |
843c0a8a | 949 | conn->tmf_state = TMF_NOT_FOUND; |
7ea8b828 | 950 | else |
843c0a8a | 951 | conn->tmf_state = TMF_FAILED; |
7ea8b828 MC |
952 | wake_up(&conn->ehwait); |
953 | } | |
954 | ||
f6d5180c MC |
955 | static void iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr) |
956 | { | |
957 | struct iscsi_nopout hdr; | |
9c19a7d0 | 958 | struct iscsi_task *task; |
f6d5180c | 959 | |
9c19a7d0 | 960 | if (!rhdr && conn->ping_task) |
f6d5180c MC |
961 | return; |
962 | ||
963 | memset(&hdr, 0, sizeof(struct iscsi_nopout)); | |
964 | hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE; | |
965 | hdr.flags = ISCSI_FLAG_CMD_FINAL; | |
966 | ||
967 | if (rhdr) { | |
968 | memcpy(hdr.lun, rhdr->lun, 8); | |
969 | hdr.ttt = rhdr->ttt; | |
970 | hdr.itt = RESERVED_ITT; | |
971 | } else | |
972 | hdr.ttt = RESERVED_ITT; | |
973 | ||
9c19a7d0 MC |
974 | task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0); |
975 | if (!task) | |
322d739d | 976 | iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n"); |
d3acf022 MC |
977 | else if (!rhdr) { |
978 | /* only track our nops */ | |
979 | conn->ping_task = task; | |
980 | conn->last_ping = jiffies; | |
981 | } | |
f6d5180c MC |
982 | } |
983 | ||
8afa1439 MC |
984 | static int iscsi_nop_out_rsp(struct iscsi_task *task, |
985 | struct iscsi_nopin *nop, char *data, int datalen) | |
986 | { | |
987 | struct iscsi_conn *conn = task->conn; | |
988 | int rc = 0; | |
989 | ||
990 | if (conn->ping_task != task) { | |
991 | /* | |
992 | * If this is not in response to one of our | |
993 | * nops then it must be from userspace. | |
994 | */ | |
995 | if (iscsi_recv_pdu(conn->cls_conn, (struct iscsi_hdr *)nop, | |
996 | data, datalen)) | |
997 | rc = ISCSI_ERR_CONN_FAILED; | |
998 | } else | |
999 | mod_timer(&conn->transport_timer, jiffies + conn->recv_timeout); | |
1000 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); | |
1001 | return rc; | |
1002 | } | |
1003 | ||
62f38300 MC |
1004 | static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
1005 | char *data, int datalen) | |
1006 | { | |
1007 | struct iscsi_reject *reject = (struct iscsi_reject *)hdr; | |
1008 | struct iscsi_hdr rejected_pdu; | |
8afa1439 | 1009 | int opcode, rc = 0; |
62f38300 MC |
1010 | |
1011 | conn->exp_statsn = be32_to_cpu(reject->statsn) + 1; | |
1012 | ||
8afa1439 MC |
1013 | if (ntoh24(reject->dlength) > datalen || |
1014 | ntoh24(reject->dlength) < sizeof(struct iscsi_hdr)) { | |
1015 | iscsi_conn_printk(KERN_ERR, conn, "Cannot handle rejected " | |
1016 | "pdu. Invalid data length (pdu dlength " | |
1017 | "%u, datalen %d\n", ntoh24(reject->dlength), | |
1018 | datalen); | |
1019 | return ISCSI_ERR_PROTO; | |
1020 | } | |
1021 | memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr)); | |
1022 | opcode = rejected_pdu.opcode & ISCSI_OPCODE_MASK; | |
1023 | ||
1024 | switch (reject->reason) { | |
1025 | case ISCSI_REASON_DATA_DIGEST_ERROR: | |
1026 | iscsi_conn_printk(KERN_ERR, conn, | |
1027 | "pdu (op 0x%x itt 0x%x) rejected " | |
1028 | "due to DataDigest error.\n", | |
1029 | rejected_pdu.itt, opcode); | |
1030 | break; | |
1031 | case ISCSI_REASON_IMM_CMD_REJECT: | |
1032 | iscsi_conn_printk(KERN_ERR, conn, | |
1033 | "pdu (op 0x%x itt 0x%x) rejected. Too many " | |
1034 | "immediate commands.\n", | |
1035 | rejected_pdu.itt, opcode); | |
1036 | /* | |
1037 | * We only send one TMF at a time so if the target could not | |
1038 | * handle it, then it should get fixed (RFC mandates that | |
1039 | * a target can handle one immediate TMF per conn). | |
1040 | * | |
1041 | * For nops-outs, we could have sent more than one if | |
1042 | * the target is sending us lots of nop-ins | |
1043 | */ | |
1044 | if (opcode != ISCSI_OP_NOOP_OUT) | |
1045 | return 0; | |
62f38300 | 1046 | |
8afa1439 MC |
1047 | if (rejected_pdu.itt == cpu_to_be32(ISCSI_RESERVED_TAG)) |
1048 | /* | |
1049 | * nop-out in response to target's nop-out rejected. | |
1050 | * Just resend. | |
1051 | */ | |
1052 | iscsi_send_nopout(conn, | |
1053 | (struct iscsi_nopin*)&rejected_pdu); | |
1054 | else { | |
1055 | struct iscsi_task *task; | |
1056 | /* | |
1057 | * Our nop as ping got dropped. We know the target | |
1058 | * and transport are ok so just clean up | |
1059 | */ | |
1060 | task = iscsi_itt_to_task(conn, rejected_pdu.itt); | |
1061 | if (!task) { | |
1062 | iscsi_conn_printk(KERN_ERR, conn, | |
1063 | "Invalid pdu reject. Could " | |
1064 | "not lookup rejected task.\n"); | |
1065 | rc = ISCSI_ERR_BAD_ITT; | |
1066 | } else | |
1067 | rc = iscsi_nop_out_rsp(task, | |
1068 | (struct iscsi_nopin*)&rejected_pdu, | |
1069 | NULL, 0); | |
62f38300 | 1070 | } |
8afa1439 MC |
1071 | break; |
1072 | default: | |
1073 | iscsi_conn_printk(KERN_ERR, conn, | |
1074 | "pdu (op 0x%x itt 0x%x) rejected. Reason " | |
1075 | "code 0x%x\n", rejected_pdu.itt, | |
1076 | rejected_pdu.opcode, reject->reason); | |
1077 | break; | |
62f38300 | 1078 | } |
8afa1439 | 1079 | return rc; |
62f38300 MC |
1080 | } |
1081 | ||
913e5bf4 MC |
1082 | /** |
1083 | * iscsi_itt_to_task - look up task by itt | |
1084 | * @conn: iscsi connection | |
1085 | * @itt: itt | |
1086 | * | |
1087 | * This should be used for mgmt tasks like login and nops, or if | |
1088 | * the LDD's itt space does not include the session age. | |
1089 | * | |
1090 | * The session lock must be held. | |
1091 | */ | |
8f9256ce | 1092 | struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *conn, itt_t itt) |
913e5bf4 MC |
1093 | { |
1094 | struct iscsi_session *session = conn->session; | |
262ef636 | 1095 | int i; |
913e5bf4 MC |
1096 | |
1097 | if (itt == RESERVED_ITT) | |
1098 | return NULL; | |
1099 | ||
262ef636 MC |
1100 | if (session->tt->parse_pdu_itt) |
1101 | session->tt->parse_pdu_itt(conn, itt, &i, NULL); | |
1102 | else | |
1103 | i = get_itt(itt); | |
913e5bf4 MC |
1104 | if (i >= session->cmds_max) |
1105 | return NULL; | |
1106 | ||
1107 | return session->cmds[i]; | |
1108 | } | |
8f9256ce | 1109 | EXPORT_SYMBOL_GPL(iscsi_itt_to_task); |
913e5bf4 | 1110 | |
7996a778 MC |
1111 | /** |
1112 | * __iscsi_complete_pdu - complete pdu | |
1113 | * @conn: iscsi conn | |
1114 | * @hdr: iscsi header | |
1115 | * @data: data buffer | |
1116 | * @datalen: len of data buffer | |
1117 | * | |
1118 | * Completes pdu processing by freeing any resources allocated at | |
1119 | * queuecommand or send generic. session lock must be held and verify | |
1120 | * itt must have been called. | |
1121 | */ | |
913e5bf4 MC |
1122 | int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
1123 | char *data, int datalen) | |
7996a778 MC |
1124 | { |
1125 | struct iscsi_session *session = conn->session; | |
1126 | int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0; | |
9c19a7d0 | 1127 | struct iscsi_task *task; |
7996a778 MC |
1128 | uint32_t itt; |
1129 | ||
f6d5180c | 1130 | conn->last_recv = jiffies; |
0af967f5 MC |
1131 | rc = iscsi_verify_itt(conn, hdr->itt); |
1132 | if (rc) | |
1133 | return rc; | |
1134 | ||
b4377356 AV |
1135 | if (hdr->itt != RESERVED_ITT) |
1136 | itt = get_itt(hdr->itt); | |
7996a778 | 1137 | else |
b4377356 | 1138 | itt = ~0U; |
7996a778 | 1139 | |
1b2c7af8 MC |
1140 | ISCSI_DBG_SESSION(session, "[op 0x%x cid %d itt 0x%x len %d]\n", |
1141 | opcode, conn->id, itt, datalen); | |
7996a778 | 1142 | |
3e5c28ad | 1143 | if (itt == ~0U) { |
77a23c21 | 1144 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); |
62f38300 | 1145 | |
7996a778 MC |
1146 | switch(opcode) { |
1147 | case ISCSI_OP_NOOP_IN: | |
40527afe | 1148 | if (datalen) { |
7996a778 | 1149 | rc = ISCSI_ERR_PROTO; |
40527afe MC |
1150 | break; |
1151 | } | |
1152 | ||
b4377356 | 1153 | if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG)) |
40527afe MC |
1154 | break; |
1155 | ||
f6d5180c | 1156 | iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr); |
7996a778 MC |
1157 | break; |
1158 | case ISCSI_OP_REJECT: | |
62f38300 MC |
1159 | rc = iscsi_handle_reject(conn, hdr, data, datalen); |
1160 | break; | |
7996a778 | 1161 | case ISCSI_OP_ASYNC_EVENT: |
8d2860b3 | 1162 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; |
5831c737 MC |
1163 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) |
1164 | rc = ISCSI_ERR_CONN_FAILED; | |
7996a778 MC |
1165 | break; |
1166 | default: | |
1167 | rc = ISCSI_ERR_BAD_OPCODE; | |
1168 | break; | |
1169 | } | |
3e5c28ad MC |
1170 | goto out; |
1171 | } | |
1172 | ||
3e5c28ad MC |
1173 | switch(opcode) { |
1174 | case ISCSI_OP_SCSI_CMD_RSP: | |
913e5bf4 MC |
1175 | case ISCSI_OP_SCSI_DATA_IN: |
1176 | task = iscsi_itt_to_ctask(conn, hdr->itt); | |
1177 | if (!task) | |
1178 | return ISCSI_ERR_BAD_ITT; | |
d355e57d | 1179 | task->last_xfer = jiffies; |
913e5bf4 MC |
1180 | break; |
1181 | case ISCSI_OP_R2T: | |
1182 | /* | |
1183 | * LLD handles R2Ts if they need to. | |
1184 | */ | |
1185 | return 0; | |
1186 | case ISCSI_OP_LOGOUT_RSP: | |
1187 | case ISCSI_OP_LOGIN_RSP: | |
1188 | case ISCSI_OP_TEXT_RSP: | |
1189 | case ISCSI_OP_SCSI_TMFUNC_RSP: | |
1190 | case ISCSI_OP_NOOP_IN: | |
1191 | task = iscsi_itt_to_task(conn, hdr->itt); | |
1192 | if (!task) | |
1193 | return ISCSI_ERR_BAD_ITT; | |
1194 | break; | |
1195 | default: | |
1196 | return ISCSI_ERR_BAD_OPCODE; | |
1197 | } | |
1198 | ||
1199 | switch(opcode) { | |
1200 | case ISCSI_OP_SCSI_CMD_RSP: | |
9c19a7d0 | 1201 | iscsi_scsi_cmd_rsp(conn, hdr, task, data, datalen); |
3e5c28ad MC |
1202 | break; |
1203 | case ISCSI_OP_SCSI_DATA_IN: | |
1d9edf02 | 1204 | iscsi_data_in_rsp(conn, hdr, task); |
3e5c28ad | 1205 | break; |
3e5c28ad MC |
1206 | case ISCSI_OP_LOGOUT_RSP: |
1207 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
1208 | if (datalen) { | |
1209 | rc = ISCSI_ERR_PROTO; | |
1210 | break; | |
1211 | } | |
1212 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
1213 | goto recv_pdu; | |
1214 | case ISCSI_OP_LOGIN_RSP: | |
1215 | case ISCSI_OP_TEXT_RSP: | |
1216 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
1217 | /* | |
1218 | * login related PDU's exp_statsn is handled in | |
1219 | * userspace | |
1220 | */ | |
1221 | goto recv_pdu; | |
1222 | case ISCSI_OP_SCSI_TMFUNC_RSP: | |
1223 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
1224 | if (datalen) { | |
1225 | rc = ISCSI_ERR_PROTO; | |
1226 | break; | |
1227 | } | |
1228 | ||
1229 | iscsi_tmf_rsp(conn, hdr); | |
b3cd5050 | 1230 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); |
3e5c28ad MC |
1231 | break; |
1232 | case ISCSI_OP_NOOP_IN: | |
1233 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
1234 | if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) { | |
1235 | rc = ISCSI_ERR_PROTO; | |
1236 | break; | |
1237 | } | |
1238 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
1239 | ||
8afa1439 MC |
1240 | rc = iscsi_nop_out_rsp(task, (struct iscsi_nopin*)hdr, |
1241 | data, datalen); | |
3e5c28ad MC |
1242 | break; |
1243 | default: | |
1244 | rc = ISCSI_ERR_BAD_OPCODE; | |
1245 | break; | |
1246 | } | |
7996a778 | 1247 | |
3e5c28ad MC |
1248 | out: |
1249 | return rc; | |
1250 | recv_pdu: | |
1251 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) | |
1252 | rc = ISCSI_ERR_CONN_FAILED; | |
b3cd5050 | 1253 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); |
7996a778 MC |
1254 | return rc; |
1255 | } | |
913e5bf4 | 1256 | EXPORT_SYMBOL_GPL(__iscsi_complete_pdu); |
7996a778 MC |
1257 | |
1258 | int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
1259 | char *data, int datalen) | |
1260 | { | |
1261 | int rc; | |
1262 | ||
1263 | spin_lock(&conn->session->lock); | |
1264 | rc = __iscsi_complete_pdu(conn, hdr, data, datalen); | |
1265 | spin_unlock(&conn->session->lock); | |
1266 | return rc; | |
1267 | } | |
1268 | EXPORT_SYMBOL_GPL(iscsi_complete_pdu); | |
1269 | ||
0af967f5 | 1270 | int iscsi_verify_itt(struct iscsi_conn *conn, itt_t itt) |
7996a778 MC |
1271 | { |
1272 | struct iscsi_session *session = conn->session; | |
262ef636 | 1273 | int age = 0, i = 0; |
7996a778 | 1274 | |
0af967f5 MC |
1275 | if (itt == RESERVED_ITT) |
1276 | return 0; | |
7996a778 | 1277 | |
262ef636 MC |
1278 | if (session->tt->parse_pdu_itt) |
1279 | session->tt->parse_pdu_itt(conn, itt, &i, &age); | |
1280 | else { | |
1281 | i = get_itt(itt); | |
1282 | age = ((__force u32)itt >> ISCSI_AGE_SHIFT) & ISCSI_AGE_MASK; | |
1283 | } | |
1284 | ||
1285 | if (age != session->age) { | |
0af967f5 MC |
1286 | iscsi_conn_printk(KERN_ERR, conn, |
1287 | "received itt %x expected session age (%x)\n", | |
913e5bf4 | 1288 | (__force u32)itt, session->age); |
0af967f5 MC |
1289 | return ISCSI_ERR_BAD_ITT; |
1290 | } | |
7996a778 | 1291 | |
3e5c28ad MC |
1292 | if (i >= session->cmds_max) { |
1293 | iscsi_conn_printk(KERN_ERR, conn, | |
1294 | "received invalid itt index %u (max cmds " | |
1295 | "%u.\n", i, session->cmds_max); | |
1296 | return ISCSI_ERR_BAD_ITT; | |
7996a778 | 1297 | } |
7996a778 MC |
1298 | return 0; |
1299 | } | |
1300 | EXPORT_SYMBOL_GPL(iscsi_verify_itt); | |
1301 | ||
913e5bf4 MC |
1302 | /** |
1303 | * iscsi_itt_to_ctask - look up ctask by itt | |
1304 | * @conn: iscsi connection | |
1305 | * @itt: itt | |
1306 | * | |
1307 | * This should be used for cmd tasks. | |
1308 | * | |
1309 | * The session lock must be held. | |
1310 | */ | |
1311 | struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *conn, itt_t itt) | |
0af967f5 | 1312 | { |
9c19a7d0 | 1313 | struct iscsi_task *task; |
0af967f5 MC |
1314 | |
1315 | if (iscsi_verify_itt(conn, itt)) | |
1316 | return NULL; | |
1317 | ||
913e5bf4 MC |
1318 | task = iscsi_itt_to_task(conn, itt); |
1319 | if (!task || !task->sc) | |
0af967f5 MC |
1320 | return NULL; |
1321 | ||
913e5bf4 MC |
1322 | if (task->sc->SCp.phase != conn->session->age) { |
1323 | iscsi_session_printk(KERN_ERR, conn->session, | |
1324 | "task's session age %d, expected %d\n", | |
1325 | task->sc->SCp.phase, conn->session->age); | |
0af967f5 | 1326 | return NULL; |
913e5bf4 | 1327 | } |
0af967f5 | 1328 | |
9c19a7d0 | 1329 | return task; |
0af967f5 MC |
1330 | } |
1331 | EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask); | |
1332 | ||
40a06e75 | 1333 | void iscsi_session_failure(struct iscsi_session *session, |
e5bd7b54 MC |
1334 | enum iscsi_err err) |
1335 | { | |
e5bd7b54 MC |
1336 | struct iscsi_conn *conn; |
1337 | struct device *dev; | |
1338 | unsigned long flags; | |
1339 | ||
1340 | spin_lock_irqsave(&session->lock, flags); | |
1341 | conn = session->leadconn; | |
1342 | if (session->state == ISCSI_STATE_TERMINATE || !conn) { | |
1343 | spin_unlock_irqrestore(&session->lock, flags); | |
1344 | return; | |
1345 | } | |
1346 | ||
1347 | dev = get_device(&conn->cls_conn->dev); | |
1348 | spin_unlock_irqrestore(&session->lock, flags); | |
1349 | if (!dev) | |
1350 | return; | |
1351 | /* | |
1352 | * if the host is being removed bypass the connection | |
1353 | * recovery initialization because we are going to kill | |
1354 | * the session. | |
1355 | */ | |
1356 | if (err == ISCSI_ERR_INVALID_HOST) | |
1357 | iscsi_conn_error_event(conn->cls_conn, err); | |
1358 | else | |
1359 | iscsi_conn_failure(conn, err); | |
1360 | put_device(dev); | |
1361 | } | |
1362 | EXPORT_SYMBOL_GPL(iscsi_session_failure); | |
1363 | ||
7996a778 MC |
1364 | void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err) |
1365 | { | |
1366 | struct iscsi_session *session = conn->session; | |
1367 | unsigned long flags; | |
1368 | ||
1369 | spin_lock_irqsave(&session->lock, flags); | |
656cffc9 MC |
1370 | if (session->state == ISCSI_STATE_FAILED) { |
1371 | spin_unlock_irqrestore(&session->lock, flags); | |
1372 | return; | |
1373 | } | |
1374 | ||
67a61114 | 1375 | if (conn->stop_stage == 0) |
7996a778 MC |
1376 | session->state = ISCSI_STATE_FAILED; |
1377 | spin_unlock_irqrestore(&session->lock, flags); | |
e5bd7b54 | 1378 | |
7996a778 MC |
1379 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); |
1380 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
e5bd7b54 | 1381 | iscsi_conn_error_event(conn->cls_conn, err); |
7996a778 MC |
1382 | } |
1383 | EXPORT_SYMBOL_GPL(iscsi_conn_failure); | |
1384 | ||
77a23c21 MC |
1385 | static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn) |
1386 | { | |
1387 | struct iscsi_session *session = conn->session; | |
1388 | ||
1389 | /* | |
1390 | * Check for iSCSI window and take care of CmdSN wrap-around | |
1391 | */ | |
e0726407 | 1392 | if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) { |
1b2c7af8 MC |
1393 | ISCSI_DBG_SESSION(session, "iSCSI CmdSN closed. ExpCmdSn " |
1394 | "%u MaxCmdSN %u CmdSN %u/%u\n", | |
1395 | session->exp_cmdsn, session->max_cmdsn, | |
1396 | session->cmdsn, session->queued_cmdsn); | |
77a23c21 MC |
1397 | return -ENOSPC; |
1398 | } | |
1399 | return 0; | |
1400 | } | |
1401 | ||
9c19a7d0 | 1402 | static int iscsi_xmit_task(struct iscsi_conn *conn) |
77a23c21 | 1403 | { |
9c19a7d0 | 1404 | struct iscsi_task *task = conn->task; |
843c0a8a | 1405 | int rc; |
77a23c21 | 1406 | |
70b31c15 MC |
1407 | if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) |
1408 | return -ENODATA; | |
1409 | ||
9c19a7d0 | 1410 | __iscsi_get_task(task); |
77a23c21 | 1411 | spin_unlock_bh(&conn->session->lock); |
9c19a7d0 | 1412 | rc = conn->session->tt->xmit_task(task); |
77a23c21 | 1413 | spin_lock_bh(&conn->session->lock); |
d355e57d | 1414 | if (!rc) { |
9c19a7d0 | 1415 | /* done with this task */ |
d355e57d | 1416 | task->last_xfer = jiffies; |
9c19a7d0 | 1417 | conn->task = NULL; |
d355e57d MC |
1418 | } |
1419 | __iscsi_put_task(task); | |
77a23c21 MC |
1420 | return rc; |
1421 | } | |
1422 | ||
843c0a8a | 1423 | /** |
9c19a7d0 MC |
1424 | * iscsi_requeue_task - requeue task to run from session workqueue |
1425 | * @task: task to requeue | |
843c0a8a | 1426 | * |
9c19a7d0 | 1427 | * LLDs that need to run a task from the session workqueue should call |
052d0144 MC |
1428 | * this. The session lock must be held. This should only be called |
1429 | * by software drivers. | |
843c0a8a | 1430 | */ |
9c19a7d0 | 1431 | void iscsi_requeue_task(struct iscsi_task *task) |
843c0a8a | 1432 | { |
9c19a7d0 | 1433 | struct iscsi_conn *conn = task->conn; |
843c0a8a | 1434 | |
3bbaaad9 MC |
1435 | /* |
1436 | * this may be on the requeue list already if the xmit_task callout | |
1437 | * is handling the r2ts while we are adding new ones | |
1438 | */ | |
1439 | if (list_empty(&task->running)) | |
1440 | list_add_tail(&task->running, &conn->requeue); | |
32ae763e | 1441 | iscsi_conn_queue_work(conn); |
843c0a8a | 1442 | } |
9c19a7d0 | 1443 | EXPORT_SYMBOL_GPL(iscsi_requeue_task); |
843c0a8a | 1444 | |
7996a778 MC |
1445 | /** |
1446 | * iscsi_data_xmit - xmit any command into the scheduled connection | |
1447 | * @conn: iscsi connection | |
1448 | * | |
1449 | * Notes: | |
1450 | * The function can return -EAGAIN in which case the caller must | |
1451 | * re-schedule it again later or recover. '0' return code means | |
1452 | * successful xmit. | |
1453 | **/ | |
1454 | static int iscsi_data_xmit(struct iscsi_conn *conn) | |
1455 | { | |
5d12c05e | 1456 | struct iscsi_task *task; |
3219e529 | 1457 | int rc = 0; |
7996a778 | 1458 | |
77a23c21 | 1459 | spin_lock_bh(&conn->session->lock); |
70b31c15 | 1460 | if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) { |
1b2c7af8 | 1461 | ISCSI_DBG_SESSION(conn->session, "Tx suspended!\n"); |
77a23c21 | 1462 | spin_unlock_bh(&conn->session->lock); |
3219e529 | 1463 | return -ENODATA; |
7996a778 | 1464 | } |
7996a778 | 1465 | |
9c19a7d0 MC |
1466 | if (conn->task) { |
1467 | rc = iscsi_xmit_task(conn); | |
3219e529 | 1468 | if (rc) |
70b31c15 | 1469 | goto done; |
7996a778 MC |
1470 | } |
1471 | ||
77a23c21 MC |
1472 | /* |
1473 | * process mgmt pdus like nops before commands since we should | |
1474 | * only have one nop-out as a ping from us and targets should not | |
1475 | * overflow us with nop-ins | |
1476 | */ | |
1477 | check_mgmt: | |
843c0a8a | 1478 | while (!list_empty(&conn->mgmtqueue)) { |
9c19a7d0 MC |
1479 | conn->task = list_entry(conn->mgmtqueue.next, |
1480 | struct iscsi_task, running); | |
3bbaaad9 | 1481 | list_del_init(&conn->task->running); |
9c19a7d0 MC |
1482 | if (iscsi_prep_mgmt_task(conn, conn->task)) { |
1483 | __iscsi_put_task(conn->task); | |
1484 | conn->task = NULL; | |
b3a7ea8d MC |
1485 | continue; |
1486 | } | |
9c19a7d0 | 1487 | rc = iscsi_xmit_task(conn); |
77a23c21 | 1488 | if (rc) |
70b31c15 | 1489 | goto done; |
7996a778 MC |
1490 | } |
1491 | ||
843c0a8a | 1492 | /* process pending command queue */ |
3bbaaad9 | 1493 | while (!list_empty(&conn->cmdqueue)) { |
5d12c05e MC |
1494 | conn->task = list_entry(conn->cmdqueue.next, struct iscsi_task, |
1495 | running); | |
3bbaaad9 | 1496 | list_del_init(&conn->task->running); |
b3a7ea8d | 1497 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) { |
b3cd5050 | 1498 | fail_scsi_task(conn->task, DID_IMM_RETRY); |
b3a7ea8d MC |
1499 | continue; |
1500 | } | |
577577da MC |
1501 | rc = iscsi_prep_scsi_cmd_pdu(conn->task); |
1502 | if (rc) { | |
5d12c05e | 1503 | if (rc == -ENOMEM || rc == -EACCES) { |
3bbaaad9 MC |
1504 | list_add_tail(&conn->task->running, |
1505 | &conn->cmdqueue); | |
577577da | 1506 | conn->task = NULL; |
70b31c15 | 1507 | goto done; |
577577da | 1508 | } else |
b3cd5050 | 1509 | fail_scsi_task(conn->task, DID_ABORT); |
004d6530 BH |
1510 | continue; |
1511 | } | |
9c19a7d0 | 1512 | rc = iscsi_xmit_task(conn); |
77a23c21 | 1513 | if (rc) |
70b31c15 | 1514 | goto done; |
77a23c21 | 1515 | /* |
9c19a7d0 | 1516 | * we could continuously get new task requests so |
77a23c21 MC |
1517 | * we need to check the mgmt queue for nops that need to |
1518 | * be sent to aviod starvation | |
1519 | */ | |
843c0a8a MC |
1520 | if (!list_empty(&conn->mgmtqueue)) |
1521 | goto check_mgmt; | |
1522 | } | |
1523 | ||
1524 | while (!list_empty(&conn->requeue)) { | |
b3a7ea8d MC |
1525 | /* |
1526 | * we always do fastlogout - conn stop code will clean up. | |
1527 | */ | |
1528 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) | |
1529 | break; | |
1530 | ||
5d12c05e MC |
1531 | task = list_entry(conn->requeue.next, struct iscsi_task, |
1532 | running); | |
1533 | if (iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_DATA_OUT)) | |
1534 | break; | |
1535 | ||
1536 | conn->task = task; | |
3bbaaad9 | 1537 | list_del_init(&conn->task->running); |
9c19a7d0 | 1538 | conn->task->state = ISCSI_TASK_RUNNING; |
9c19a7d0 | 1539 | rc = iscsi_xmit_task(conn); |
843c0a8a | 1540 | if (rc) |
70b31c15 | 1541 | goto done; |
843c0a8a | 1542 | if (!list_empty(&conn->mgmtqueue)) |
77a23c21 | 1543 | goto check_mgmt; |
7996a778 | 1544 | } |
b6c395ed | 1545 | spin_unlock_bh(&conn->session->lock); |
3219e529 | 1546 | return -ENODATA; |
7996a778 | 1547 | |
70b31c15 | 1548 | done: |
77a23c21 | 1549 | spin_unlock_bh(&conn->session->lock); |
3219e529 | 1550 | return rc; |
7996a778 MC |
1551 | } |
1552 | ||
c4028958 | 1553 | static void iscsi_xmitworker(struct work_struct *work) |
7996a778 | 1554 | { |
c4028958 DH |
1555 | struct iscsi_conn *conn = |
1556 | container_of(work, struct iscsi_conn, xmitwork); | |
3219e529 | 1557 | int rc; |
7996a778 MC |
1558 | /* |
1559 | * serialize Xmit worker on a per-connection basis. | |
1560 | */ | |
3219e529 MC |
1561 | do { |
1562 | rc = iscsi_data_xmit(conn); | |
1563 | } while (rc >= 0 || rc == -EAGAIN); | |
7996a778 MC |
1564 | } |
1565 | ||
577577da MC |
1566 | static inline struct iscsi_task *iscsi_alloc_task(struct iscsi_conn *conn, |
1567 | struct scsi_cmnd *sc) | |
1568 | { | |
1569 | struct iscsi_task *task; | |
1570 | ||
7acd72eb | 1571 | if (!kfifo_out(&conn->session->cmdpool.queue, |
577577da MC |
1572 | (void *) &task, sizeof(void *))) |
1573 | return NULL; | |
1574 | ||
1575 | sc->SCp.phase = conn->session->age; | |
1576 | sc->SCp.ptr = (char *) task; | |
1577 | ||
1578 | atomic_set(&task->refcount, 1); | |
1579 | task->state = ISCSI_TASK_PENDING; | |
1580 | task->conn = conn; | |
1581 | task->sc = sc; | |
d355e57d MC |
1582 | task->have_checked_conn = false; |
1583 | task->last_timeout = jiffies; | |
1584 | task->last_xfer = jiffies; | |
577577da MC |
1585 | INIT_LIST_HEAD(&task->running); |
1586 | return task; | |
1587 | } | |
1588 | ||
7996a778 MC |
1589 | enum { |
1590 | FAILURE_BAD_HOST = 1, | |
1591 | FAILURE_SESSION_FAILED, | |
1592 | FAILURE_SESSION_FREED, | |
1593 | FAILURE_WINDOW_CLOSED, | |
60ecebf5 | 1594 | FAILURE_OOM, |
7996a778 | 1595 | FAILURE_SESSION_TERMINATE, |
656cffc9 | 1596 | FAILURE_SESSION_IN_RECOVERY, |
7996a778 | 1597 | FAILURE_SESSION_RECOVERY_TIMEOUT, |
b3a7ea8d | 1598 | FAILURE_SESSION_LOGGING_OUT, |
6eabafbe | 1599 | FAILURE_SESSION_NOT_READY, |
7996a778 MC |
1600 | }; |
1601 | ||
1602 | int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *)) | |
1603 | { | |
75613521 | 1604 | struct iscsi_cls_session *cls_session; |
7996a778 | 1605 | struct Scsi_Host *host; |
1336aed1 | 1606 | struct iscsi_host *ihost; |
7996a778 MC |
1607 | int reason = 0; |
1608 | struct iscsi_session *session; | |
1609 | struct iscsi_conn *conn; | |
9c19a7d0 | 1610 | struct iscsi_task *task = NULL; |
7996a778 MC |
1611 | |
1612 | sc->scsi_done = done; | |
1613 | sc->result = 0; | |
f47f2cf5 | 1614 | sc->SCp.ptr = NULL; |
7996a778 MC |
1615 | |
1616 | host = sc->device->host; | |
1336aed1 | 1617 | ihost = shost_priv(host); |
1040c99d | 1618 | spin_unlock(host->host_lock); |
7996a778 | 1619 | |
75613521 MC |
1620 | cls_session = starget_to_session(scsi_target(sc->device)); |
1621 | session = cls_session->dd_data; | |
7996a778 MC |
1622 | spin_lock(&session->lock); |
1623 | ||
75613521 | 1624 | reason = iscsi_session_chkready(cls_session); |
6eabafbe MC |
1625 | if (reason) { |
1626 | sc->result = reason; | |
1627 | goto fault; | |
1628 | } | |
1629 | ||
301e0f7e | 1630 | if (session->state != ISCSI_STATE_LOGGED_IN) { |
656cffc9 MC |
1631 | /* |
1632 | * to handle the race between when we set the recovery state | |
1633 | * and block the session we requeue here (commands could | |
1634 | * be entering our queuecommand while a block is starting | |
1635 | * up because the block code is not locked) | |
1636 | */ | |
9000bcd6 | 1637 | switch (session->state) { |
301e0f7e | 1638 | case ISCSI_STATE_FAILED: |
9000bcd6 | 1639 | case ISCSI_STATE_IN_RECOVERY: |
656cffc9 | 1640 | reason = FAILURE_SESSION_IN_RECOVERY; |
301e0f7e MC |
1641 | sc->result = DID_IMM_RETRY << 16; |
1642 | break; | |
9000bcd6 MC |
1643 | case ISCSI_STATE_LOGGING_OUT: |
1644 | reason = FAILURE_SESSION_LOGGING_OUT; | |
301e0f7e MC |
1645 | sc->result = DID_IMM_RETRY << 16; |
1646 | break; | |
b3a7ea8d | 1647 | case ISCSI_STATE_RECOVERY_FAILED: |
656cffc9 | 1648 | reason = FAILURE_SESSION_RECOVERY_TIMEOUT; |
56d7fcfa | 1649 | sc->result = DID_TRANSPORT_FAILFAST << 16; |
b3a7ea8d MC |
1650 | break; |
1651 | case ISCSI_STATE_TERMINATE: | |
656cffc9 | 1652 | reason = FAILURE_SESSION_TERMINATE; |
6eabafbe | 1653 | sc->result = DID_NO_CONNECT << 16; |
b3a7ea8d | 1654 | break; |
b3a7ea8d | 1655 | default: |
656cffc9 | 1656 | reason = FAILURE_SESSION_FREED; |
6eabafbe | 1657 | sc->result = DID_NO_CONNECT << 16; |
b3a7ea8d | 1658 | } |
7996a778 MC |
1659 | goto fault; |
1660 | } | |
1661 | ||
7996a778 | 1662 | conn = session->leadconn; |
98644047 MC |
1663 | if (!conn) { |
1664 | reason = FAILURE_SESSION_FREED; | |
6eabafbe | 1665 | sc->result = DID_NO_CONNECT << 16; |
98644047 MC |
1666 | goto fault; |
1667 | } | |
7996a778 | 1668 | |
661134ad MC |
1669 | if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) { |
1670 | reason = FAILURE_SESSION_IN_RECOVERY; | |
1671 | sc->result = DID_REQUEUE; | |
1672 | goto fault; | |
1673 | } | |
1674 | ||
77a23c21 MC |
1675 | if (iscsi_check_cmdsn_window_closed(conn)) { |
1676 | reason = FAILURE_WINDOW_CLOSED; | |
1677 | goto reject; | |
1678 | } | |
1679 | ||
577577da MC |
1680 | task = iscsi_alloc_task(conn, sc); |
1681 | if (!task) { | |
60ecebf5 MC |
1682 | reason = FAILURE_OOM; |
1683 | goto reject; | |
1684 | } | |
7996a778 | 1685 | |
1336aed1 | 1686 | if (!ihost->workq) { |
577577da MC |
1687 | reason = iscsi_prep_scsi_cmd_pdu(task); |
1688 | if (reason) { | |
5d12c05e | 1689 | if (reason == -ENOMEM || reason == -EACCES) { |
577577da MC |
1690 | reason = FAILURE_OOM; |
1691 | goto prepd_reject; | |
1692 | } else { | |
1693 | sc->result = DID_ABORT << 16; | |
1694 | goto prepd_fault; | |
1695 | } | |
052d0144 | 1696 | } |
9c19a7d0 | 1697 | if (session->tt->xmit_task(task)) { |
d3305f34 | 1698 | session->cmdsn--; |
052d0144 | 1699 | reason = FAILURE_SESSION_NOT_READY; |
577577da | 1700 | goto prepd_reject; |
052d0144 | 1701 | } |
3bbaaad9 MC |
1702 | } else { |
1703 | list_add_tail(&task->running, &conn->cmdqueue); | |
32ae763e | 1704 | iscsi_conn_queue_work(conn); |
3bbaaad9 | 1705 | } |
052d0144 MC |
1706 | |
1707 | session->queued_cmdsn++; | |
1708 | spin_unlock(&session->lock); | |
1040c99d | 1709 | spin_lock(host->host_lock); |
7996a778 MC |
1710 | return 0; |
1711 | ||
577577da MC |
1712 | prepd_reject: |
1713 | sc->scsi_done = NULL; | |
b3cd5050 | 1714 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); |
7996a778 MC |
1715 | reject: |
1716 | spin_unlock(&session->lock); | |
1b2c7af8 MC |
1717 | ISCSI_DBG_SESSION(session, "cmd 0x%x rejected (%d)\n", |
1718 | sc->cmnd[0], reason); | |
1040c99d | 1719 | spin_lock(host->host_lock); |
d6d13ee1 | 1720 | return SCSI_MLQUEUE_TARGET_BUSY; |
7996a778 | 1721 | |
577577da MC |
1722 | prepd_fault: |
1723 | sc->scsi_done = NULL; | |
b3cd5050 | 1724 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); |
7996a778 MC |
1725 | fault: |
1726 | spin_unlock(&session->lock); | |
1b2c7af8 MC |
1727 | ISCSI_DBG_SESSION(session, "iscsi: cmd 0x%x is not queued (%d)\n", |
1728 | sc->cmnd[0], reason); | |
c07d4444 BH |
1729 | if (!scsi_bidi_cmnd(sc)) |
1730 | scsi_set_resid(sc, scsi_bufflen(sc)); | |
1731 | else { | |
1732 | scsi_out(sc)->resid = scsi_out(sc)->length; | |
1733 | scsi_in(sc)->resid = scsi_in(sc)->length; | |
1734 | } | |
052d0144 | 1735 | done(sc); |
1040c99d | 1736 | spin_lock(host->host_lock); |
7996a778 MC |
1737 | return 0; |
1738 | } | |
1739 | EXPORT_SYMBOL_GPL(iscsi_queuecommand); | |
1740 | ||
e881a172 | 1741 | int iscsi_change_queue_depth(struct scsi_device *sdev, int depth, int reason) |
7996a778 | 1742 | { |
1796e722 MC |
1743 | switch (reason) { |
1744 | case SCSI_QDEPTH_DEFAULT: | |
1745 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); | |
1746 | break; | |
1747 | case SCSI_QDEPTH_QFULL: | |
1748 | scsi_track_queue_full(sdev, depth); | |
1749 | break; | |
1750 | case SCSI_QDEPTH_RAMP_UP: | |
1751 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); | |
1752 | break; | |
1753 | default: | |
e881a172 | 1754 | return -EOPNOTSUPP; |
1796e722 | 1755 | } |
7996a778 MC |
1756 | return sdev->queue_depth; |
1757 | } | |
1758 | EXPORT_SYMBOL_GPL(iscsi_change_queue_depth); | |
1759 | ||
6b5d6c44 MC |
1760 | int iscsi_target_alloc(struct scsi_target *starget) |
1761 | { | |
1762 | struct iscsi_cls_session *cls_session = starget_to_session(starget); | |
1763 | struct iscsi_session *session = cls_session->dd_data; | |
1764 | ||
1765 | starget->can_queue = session->scsi_cmds_max; | |
1766 | return 0; | |
1767 | } | |
1768 | EXPORT_SYMBOL_GPL(iscsi_target_alloc); | |
1769 | ||
843c0a8a | 1770 | static void iscsi_tmf_timedout(unsigned long data) |
7996a778 | 1771 | { |
843c0a8a | 1772 | struct iscsi_conn *conn = (struct iscsi_conn *)data; |
7996a778 MC |
1773 | struct iscsi_session *session = conn->session; |
1774 | ||
1775 | spin_lock(&session->lock); | |
843c0a8a MC |
1776 | if (conn->tmf_state == TMF_QUEUED) { |
1777 | conn->tmf_state = TMF_TIMEDOUT; | |
bd2199d4 | 1778 | ISCSI_DBG_EH(session, "tmf timedout\n"); |
7996a778 MC |
1779 | /* unblock eh_abort() */ |
1780 | wake_up(&conn->ehwait); | |
1781 | } | |
1782 | spin_unlock(&session->lock); | |
1783 | } | |
1784 | ||
9c19a7d0 | 1785 | static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn, |
f6d5180c MC |
1786 | struct iscsi_tm *hdr, int age, |
1787 | int timeout) | |
7996a778 | 1788 | { |
7996a778 | 1789 | struct iscsi_session *session = conn->session; |
9c19a7d0 | 1790 | struct iscsi_task *task; |
7996a778 | 1791 | |
9c19a7d0 | 1792 | task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr, |
843c0a8a | 1793 | NULL, 0); |
9c19a7d0 | 1794 | if (!task) { |
6724add1 | 1795 | spin_unlock_bh(&session->lock); |
7996a778 | 1796 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
843c0a8a | 1797 | spin_lock_bh(&session->lock); |
bd2199d4 | 1798 | ISCSI_DBG_EH(session, "tmf exec failure\n"); |
77a23c21 | 1799 | return -EPERM; |
7996a778 | 1800 | } |
843c0a8a | 1801 | conn->tmfcmd_pdus_cnt++; |
f6d5180c | 1802 | conn->tmf_timer.expires = timeout * HZ + jiffies; |
843c0a8a MC |
1803 | conn->tmf_timer.function = iscsi_tmf_timedout; |
1804 | conn->tmf_timer.data = (unsigned long)conn; | |
1805 | add_timer(&conn->tmf_timer); | |
bd2199d4 | 1806 | ISCSI_DBG_EH(session, "tmf set timeout\n"); |
7996a778 | 1807 | |
7996a778 | 1808 | spin_unlock_bh(&session->lock); |
6724add1 | 1809 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1810 | |
1811 | /* | |
1812 | * block eh thread until: | |
1813 | * | |
843c0a8a MC |
1814 | * 1) tmf response |
1815 | * 2) tmf timeout | |
7996a778 MC |
1816 | * 3) session is terminated or restarted or userspace has |
1817 | * given up on recovery | |
1818 | */ | |
843c0a8a | 1819 | wait_event_interruptible(conn->ehwait, age != session->age || |
7996a778 | 1820 | session->state != ISCSI_STATE_LOGGED_IN || |
843c0a8a | 1821 | conn->tmf_state != TMF_QUEUED); |
7996a778 MC |
1822 | if (signal_pending(current)) |
1823 | flush_signals(current); | |
843c0a8a MC |
1824 | del_timer_sync(&conn->tmf_timer); |
1825 | ||
6724add1 | 1826 | mutex_lock(&session->eh_mutex); |
77a23c21 | 1827 | spin_lock_bh(&session->lock); |
9c19a7d0 | 1828 | /* if the session drops it will clean up the task */ |
843c0a8a MC |
1829 | if (age != session->age || |
1830 | session->state != ISCSI_STATE_LOGGED_IN) | |
1831 | return -ENOTCONN; | |
7996a778 MC |
1832 | return 0; |
1833 | } | |
1834 | ||
843c0a8a MC |
1835 | /* |
1836 | * Fail commands. session lock held and recv side suspended and xmit | |
1837 | * thread flushed | |
1838 | */ | |
3bbaaad9 MC |
1839 | static void fail_scsi_tasks(struct iscsi_conn *conn, unsigned lun, |
1840 | int error) | |
843c0a8a | 1841 | { |
3bbaaad9 MC |
1842 | struct iscsi_task *task; |
1843 | int i; | |
843c0a8a | 1844 | |
3bbaaad9 MC |
1845 | for (i = 0; i < conn->session->cmds_max; i++) { |
1846 | task = conn->session->cmds[i]; | |
1847 | if (!task->sc || task->state == ISCSI_TASK_FREE) | |
1848 | continue; | |
843c0a8a | 1849 | |
3bbaaad9 MC |
1850 | if (lun != -1 && lun != task->sc->device->lun) |
1851 | continue; | |
843c0a8a | 1852 | |
3bbaaad9 MC |
1853 | ISCSI_DBG_SESSION(conn->session, |
1854 | "failing sc %p itt 0x%x state %d\n", | |
1855 | task->sc, task->itt, task->state); | |
b3cd5050 | 1856 | fail_scsi_task(task, error); |
843c0a8a MC |
1857 | } |
1858 | } | |
1859 | ||
661134ad MC |
1860 | /** |
1861 | * iscsi_suspend_queue - suspend iscsi_queuecommand | |
1862 | * @conn: iscsi conn to stop queueing IO on | |
1863 | * | |
1864 | * This grabs the session lock to make sure no one is in | |
1865 | * xmit_task/queuecommand, and then sets suspend to prevent | |
1866 | * new commands from being queued. This only needs to be called | |
1867 | * by offload drivers that need to sync a path like ep disconnect | |
1868 | * with the iscsi_queuecommand/xmit_task. To start IO again libiscsi | |
1869 | * will call iscsi_start_tx and iscsi_unblock_session when in FFP. | |
1870 | */ | |
1871 | void iscsi_suspend_queue(struct iscsi_conn *conn) | |
1872 | { | |
1873 | spin_lock_bh(&conn->session->lock); | |
1874 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
1875 | spin_unlock_bh(&conn->session->lock); | |
1876 | } | |
1877 | EXPORT_SYMBOL_GPL(iscsi_suspend_queue); | |
1878 | ||
1879 | /** | |
1880 | * iscsi_suspend_tx - suspend iscsi_data_xmit | |
1881 | * @conn: iscsi conn tp stop processing IO on. | |
1882 | * | |
1883 | * This function sets the suspend bit to prevent iscsi_data_xmit | |
1884 | * from sending new IO, and if work is queued on the xmit thread | |
1885 | * it will wait for it to be completed. | |
1886 | */ | |
b40977d9 | 1887 | void iscsi_suspend_tx(struct iscsi_conn *conn) |
6724add1 | 1888 | { |
32ae763e MC |
1889 | struct Scsi_Host *shost = conn->session->host; |
1890 | struct iscsi_host *ihost = shost_priv(shost); | |
1891 | ||
6724add1 | 1892 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); |
1336aed1 | 1893 | if (ihost->workq) |
32ae763e | 1894 | flush_workqueue(ihost->workq); |
6724add1 | 1895 | } |
b40977d9 | 1896 | EXPORT_SYMBOL_GPL(iscsi_suspend_tx); |
6724add1 MC |
1897 | |
1898 | static void iscsi_start_tx(struct iscsi_conn *conn) | |
1899 | { | |
1900 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
1336aed1 | 1901 | iscsi_conn_queue_work(conn); |
6724add1 MC |
1902 | } |
1903 | ||
4c48a829 MC |
1904 | /* |
1905 | * We want to make sure a ping is in flight. It has timed out. | |
1906 | * And we are not busy processing a pdu that is making | |
1907 | * progress but got started before the ping and is taking a while | |
1908 | * to complete so the ping is just stuck behind it in a queue. | |
1909 | */ | |
1910 | static int iscsi_has_ping_timed_out(struct iscsi_conn *conn) | |
1911 | { | |
1912 | if (conn->ping_task && | |
1913 | time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) + | |
1914 | (conn->ping_timeout * HZ), jiffies)) | |
1915 | return 1; | |
1916 | else | |
1917 | return 0; | |
1918 | } | |
1919 | ||
d355e57d | 1920 | static enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *sc) |
f6d5180c | 1921 | { |
d355e57d | 1922 | enum blk_eh_timer_return rc = BLK_EH_NOT_HANDLED; |
92ed4d69 | 1923 | struct iscsi_task *task = NULL, *running_task; |
f6d5180c MC |
1924 | struct iscsi_cls_session *cls_session; |
1925 | struct iscsi_session *session; | |
1926 | struct iscsi_conn *conn; | |
92ed4d69 | 1927 | int i; |
f6d5180c | 1928 | |
d355e57d | 1929 | cls_session = starget_to_session(scsi_target(sc->device)); |
75613521 | 1930 | session = cls_session->dd_data; |
f6d5180c | 1931 | |
bd2199d4 | 1932 | ISCSI_DBG_EH(session, "scsi cmd %p timedout\n", sc); |
f6d5180c MC |
1933 | |
1934 | spin_lock(&session->lock); | |
1935 | if (session->state != ISCSI_STATE_LOGGED_IN) { | |
1936 | /* | |
1937 | * We are probably in the middle of iscsi recovery so let | |
1938 | * that complete and handle the error. | |
1939 | */ | |
242f9dcb | 1940 | rc = BLK_EH_RESET_TIMER; |
f6d5180c MC |
1941 | goto done; |
1942 | } | |
1943 | ||
1944 | conn = session->leadconn; | |
1945 | if (!conn) { | |
1946 | /* In the middle of shuting down */ | |
242f9dcb | 1947 | rc = BLK_EH_RESET_TIMER; |
f6d5180c MC |
1948 | goto done; |
1949 | } | |
1950 | ||
d355e57d | 1951 | task = (struct iscsi_task *)sc->SCp.ptr; |
92ed4d69 MC |
1952 | if (!task) { |
1953 | /* | |
1954 | * Raced with completion. Just reset timer, and let it | |
1955 | * complete normally | |
1956 | */ | |
1957 | rc = BLK_EH_RESET_TIMER; | |
d355e57d | 1958 | goto done; |
92ed4d69 MC |
1959 | } |
1960 | ||
d355e57d MC |
1961 | /* |
1962 | * If we have sent (at least queued to the network layer) a pdu or | |
1963 | * recvd one for the task since the last timeout ask for | |
1964 | * more time. If on the next timeout we have not made progress | |
1965 | * we can check if it is the task or connection when we send the | |
1966 | * nop as a ping. | |
1967 | */ | |
92ed4d69 | 1968 | if (time_after(task->last_xfer, task->last_timeout)) { |
bd2199d4 EZ |
1969 | ISCSI_DBG_EH(session, "Command making progress. Asking " |
1970 | "scsi-ml for more time to complete. " | |
92ed4d69 | 1971 | "Last data xfer at %lu. Last timeout was at " |
bd2199d4 | 1972 | "%lu\n.", task->last_xfer, task->last_timeout); |
d355e57d MC |
1973 | task->have_checked_conn = false; |
1974 | rc = BLK_EH_RESET_TIMER; | |
1975 | goto done; | |
1976 | } | |
1977 | ||
f6d5180c MC |
1978 | if (!conn->recv_timeout && !conn->ping_timeout) |
1979 | goto done; | |
1980 | /* | |
1981 | * if the ping timedout then we are in the middle of cleaning up | |
1982 | * and can let the iscsi eh handle it | |
1983 | */ | |
4c48a829 | 1984 | if (iscsi_has_ping_timed_out(conn)) { |
242f9dcb | 1985 | rc = BLK_EH_RESET_TIMER; |
4c48a829 MC |
1986 | goto done; |
1987 | } | |
d355e57d | 1988 | |
92ed4d69 MC |
1989 | for (i = 0; i < conn->session->cmds_max; i++) { |
1990 | running_task = conn->session->cmds[i]; | |
1991 | if (!running_task->sc || running_task == task || | |
1992 | running_task->state != ISCSI_TASK_RUNNING) | |
1993 | continue; | |
1994 | ||
1995 | /* | |
1996 | * Only check if cmds started before this one have made | |
1997 | * progress, or this could never fail | |
1998 | */ | |
1999 | if (time_after(running_task->sc->jiffies_at_alloc, | |
2000 | task->sc->jiffies_at_alloc)) | |
2001 | continue; | |
2002 | ||
2003 | if (time_after(running_task->last_xfer, task->last_timeout)) { | |
2004 | /* | |
2005 | * This task has not made progress, but a task | |
2006 | * started before us has transferred data since | |
2007 | * we started/last-checked. We could be queueing | |
2008 | * too many tasks or the LU is bad. | |
2009 | * | |
2010 | * If the device is bad the cmds ahead of us on | |
2011 | * other devs will complete, and this loop will | |
2012 | * eventually fail starting the scsi eh. | |
2013 | */ | |
2014 | ISCSI_DBG_EH(session, "Command has not made progress " | |
2015 | "but commands ahead of it have. " | |
2016 | "Asking scsi-ml for more time to " | |
2017 | "complete. Our last xfer vs running task " | |
2018 | "last xfer %lu/%lu. Last check %lu.\n", | |
2019 | task->last_xfer, running_task->last_xfer, | |
2020 | task->last_timeout); | |
2021 | rc = BLK_EH_RESET_TIMER; | |
2022 | goto done; | |
2023 | } | |
2024 | } | |
2025 | ||
d355e57d MC |
2026 | /* Assumes nop timeout is shorter than scsi cmd timeout */ |
2027 | if (task->have_checked_conn) | |
2028 | goto done; | |
2029 | ||
f6d5180c | 2030 | /* |
d355e57d MC |
2031 | * Checking the transport already or nop from a cmd timeout still |
2032 | * running | |
f6d5180c | 2033 | */ |
d355e57d MC |
2034 | if (conn->ping_task) { |
2035 | task->have_checked_conn = true; | |
242f9dcb | 2036 | rc = BLK_EH_RESET_TIMER; |
4c48a829 MC |
2037 | goto done; |
2038 | } | |
2039 | ||
d355e57d MC |
2040 | /* Make sure there is a transport check done */ |
2041 | iscsi_send_nopout(conn, NULL); | |
2042 | task->have_checked_conn = true; | |
2043 | rc = BLK_EH_RESET_TIMER; | |
2044 | ||
f6d5180c | 2045 | done: |
d355e57d MC |
2046 | if (task) |
2047 | task->last_timeout = jiffies; | |
f6d5180c | 2048 | spin_unlock(&session->lock); |
bd2199d4 EZ |
2049 | ISCSI_DBG_EH(session, "return %s\n", rc == BLK_EH_RESET_TIMER ? |
2050 | "timer reset" : "nh"); | |
f6d5180c MC |
2051 | return rc; |
2052 | } | |
2053 | ||
2054 | static void iscsi_check_transport_timeouts(unsigned long data) | |
2055 | { | |
2056 | struct iscsi_conn *conn = (struct iscsi_conn *)data; | |
2057 | struct iscsi_session *session = conn->session; | |
4cf10435 | 2058 | unsigned long recv_timeout, next_timeout = 0, last_recv; |
f6d5180c MC |
2059 | |
2060 | spin_lock(&session->lock); | |
2061 | if (session->state != ISCSI_STATE_LOGGED_IN) | |
2062 | goto done; | |
2063 | ||
4cf10435 MC |
2064 | recv_timeout = conn->recv_timeout; |
2065 | if (!recv_timeout) | |
f6d5180c MC |
2066 | goto done; |
2067 | ||
4cf10435 | 2068 | recv_timeout *= HZ; |
f6d5180c | 2069 | last_recv = conn->last_recv; |
4c48a829 MC |
2070 | |
2071 | if (iscsi_has_ping_timed_out(conn)) { | |
322d739d | 2072 | iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs " |
4c48a829 MC |
2073 | "expired, recv timeout %d, last rx %lu, " |
2074 | "last ping %lu, now %lu\n", | |
2075 | conn->ping_timeout, conn->recv_timeout, | |
2076 | last_recv, conn->last_ping, jiffies); | |
f6d5180c MC |
2077 | spin_unlock(&session->lock); |
2078 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
2079 | return; | |
2080 | } | |
2081 | ||
4cf10435 | 2082 | if (time_before_eq(last_recv + recv_timeout, jiffies)) { |
c8611f97 | 2083 | /* send a ping to try to provoke some traffic */ |
1b2c7af8 | 2084 | ISCSI_DBG_CONN(conn, "Sending nopout as ping\n"); |
c8611f97 | 2085 | iscsi_send_nopout(conn, NULL); |
4cf10435 | 2086 | next_timeout = conn->last_ping + (conn->ping_timeout * HZ); |
ad294e9c | 2087 | } else |
4cf10435 | 2088 | next_timeout = last_recv + recv_timeout; |
f6d5180c | 2089 | |
1b2c7af8 | 2090 | ISCSI_DBG_CONN(conn, "Setting next tmo %lu\n", next_timeout); |
ad294e9c | 2091 | mod_timer(&conn->transport_timer, next_timeout); |
f6d5180c MC |
2092 | done: |
2093 | spin_unlock(&session->lock); | |
2094 | } | |
2095 | ||
9c19a7d0 | 2096 | static void iscsi_prep_abort_task_pdu(struct iscsi_task *task, |
843c0a8a MC |
2097 | struct iscsi_tm *hdr) |
2098 | { | |
2099 | memset(hdr, 0, sizeof(*hdr)); | |
2100 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
2101 | hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK; | |
2102 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
577577da MC |
2103 | memcpy(hdr->lun, task->lun, sizeof(hdr->lun)); |
2104 | hdr->rtt = task->hdr_itt; | |
2105 | hdr->refcmdsn = task->cmdsn; | |
843c0a8a MC |
2106 | } |
2107 | ||
7996a778 MC |
2108 | int iscsi_eh_abort(struct scsi_cmnd *sc) |
2109 | { | |
75613521 MC |
2110 | struct iscsi_cls_session *cls_session; |
2111 | struct iscsi_session *session; | |
f47f2cf5 | 2112 | struct iscsi_conn *conn; |
9c19a7d0 | 2113 | struct iscsi_task *task; |
843c0a8a MC |
2114 | struct iscsi_tm *hdr; |
2115 | int rc, age; | |
7996a778 | 2116 | |
75613521 MC |
2117 | cls_session = starget_to_session(scsi_target(sc->device)); |
2118 | session = cls_session->dd_data; | |
2119 | ||
bd2199d4 | 2120 | ISCSI_DBG_EH(session, "aborting sc %p\n", sc); |
4421c9eb | 2121 | |
6724add1 MC |
2122 | mutex_lock(&session->eh_mutex); |
2123 | spin_lock_bh(&session->lock); | |
f47f2cf5 MC |
2124 | /* |
2125 | * if session was ISCSI_STATE_IN_RECOVERY then we may not have | |
2126 | * got the command. | |
2127 | */ | |
2128 | if (!sc->SCp.ptr) { | |
bd2199d4 EZ |
2129 | ISCSI_DBG_EH(session, "sc never reached iscsi layer or " |
2130 | "it completed.\n"); | |
6724add1 MC |
2131 | spin_unlock_bh(&session->lock); |
2132 | mutex_unlock(&session->eh_mutex); | |
f47f2cf5 MC |
2133 | return SUCCESS; |
2134 | } | |
2135 | ||
7996a778 MC |
2136 | /* |
2137 | * If we are not logged in or we have started a new session | |
2138 | * then let the host reset code handle this | |
2139 | */ | |
843c0a8a MC |
2140 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN || |
2141 | sc->SCp.phase != session->age) { | |
2142 | spin_unlock_bh(&session->lock); | |
2143 | mutex_unlock(&session->eh_mutex); | |
bd2199d4 | 2144 | ISCSI_DBG_EH(session, "failing abort due to dropped " |
4421c9eb | 2145 | "session.\n"); |
843c0a8a MC |
2146 | return FAILED; |
2147 | } | |
2148 | ||
2149 | conn = session->leadconn; | |
2150 | conn->eh_abort_cnt++; | |
2151 | age = session->age; | |
2152 | ||
9c19a7d0 | 2153 | task = (struct iscsi_task *)sc->SCp.ptr; |
bd2199d4 EZ |
2154 | ISCSI_DBG_EH(session, "aborting [sc %p itt 0x%x]\n", |
2155 | sc, task->itt); | |
7996a778 | 2156 | |
9c19a7d0 MC |
2157 | /* task completed before time out */ |
2158 | if (!task->sc) { | |
bd2199d4 | 2159 | ISCSI_DBG_EH(session, "sc completed while abort in progress\n"); |
77a23c21 | 2160 | goto success; |
7ea8b828 | 2161 | } |
7996a778 | 2162 | |
9c19a7d0 | 2163 | if (task->state == ISCSI_TASK_PENDING) { |
b3cd5050 | 2164 | fail_scsi_task(task, DID_ABORT); |
77a23c21 MC |
2165 | goto success; |
2166 | } | |
7996a778 | 2167 | |
843c0a8a MC |
2168 | /* only have one tmf outstanding at a time */ |
2169 | if (conn->tmf_state != TMF_INITIAL) | |
7996a778 | 2170 | goto failed; |
843c0a8a | 2171 | conn->tmf_state = TMF_QUEUED; |
7996a778 | 2172 | |
843c0a8a | 2173 | hdr = &conn->tmhdr; |
9c19a7d0 | 2174 | iscsi_prep_abort_task_pdu(task, hdr); |
843c0a8a | 2175 | |
9c19a7d0 | 2176 | if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout)) { |
843c0a8a MC |
2177 | rc = FAILED; |
2178 | goto failed; | |
2179 | } | |
2180 | ||
2181 | switch (conn->tmf_state) { | |
2182 | case TMF_SUCCESS: | |
77a23c21 | 2183 | spin_unlock_bh(&session->lock); |
913e5bf4 MC |
2184 | /* |
2185 | * stop tx side incase the target had sent a abort rsp but | |
2186 | * the initiator was still writing out data. | |
2187 | */ | |
6724add1 | 2188 | iscsi_suspend_tx(conn); |
77a23c21 | 2189 | /* |
913e5bf4 MC |
2190 | * we do not stop the recv side because targets have been |
2191 | * good and have never sent us a successful tmf response | |
2192 | * then sent more data for the cmd. | |
77a23c21 | 2193 | */ |
6187c242 | 2194 | spin_lock_bh(&session->lock); |
b3cd5050 | 2195 | fail_scsi_task(task, DID_ABORT); |
843c0a8a | 2196 | conn->tmf_state = TMF_INITIAL; |
5d12c05e | 2197 | memset(hdr, 0, sizeof(*hdr)); |
6187c242 | 2198 | spin_unlock_bh(&session->lock); |
6724add1 | 2199 | iscsi_start_tx(conn); |
77a23c21 | 2200 | goto success_unlocked; |
843c0a8a MC |
2201 | case TMF_TIMEDOUT: |
2202 | spin_unlock_bh(&session->lock); | |
2203 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
2204 | goto failed_unlocked; | |
2205 | case TMF_NOT_FOUND: | |
2206 | if (!sc->SCp.ptr) { | |
2207 | conn->tmf_state = TMF_INITIAL; | |
5d12c05e | 2208 | memset(hdr, 0, sizeof(*hdr)); |
9c19a7d0 | 2209 | /* task completed before tmf abort response */ |
bd2199d4 EZ |
2210 | ISCSI_DBG_EH(session, "sc completed while abort in " |
2211 | "progress\n"); | |
77a23c21 | 2212 | goto success; |
7ea8b828 MC |
2213 | } |
2214 | /* fall through */ | |
2215 | default: | |
843c0a8a MC |
2216 | conn->tmf_state = TMF_INITIAL; |
2217 | goto failed; | |
7996a778 MC |
2218 | } |
2219 | ||
77a23c21 | 2220 | success: |
7996a778 | 2221 | spin_unlock_bh(&session->lock); |
77a23c21 | 2222 | success_unlocked: |
bd2199d4 EZ |
2223 | ISCSI_DBG_EH(session, "abort success [sc %p itt 0x%x]\n", |
2224 | sc, task->itt); | |
6724add1 | 2225 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
2226 | return SUCCESS; |
2227 | ||
2228 | failed: | |
2229 | spin_unlock_bh(&session->lock); | |
77a23c21 | 2230 | failed_unlocked: |
bd2199d4 EZ |
2231 | ISCSI_DBG_EH(session, "abort failed [sc %p itt 0x%x]\n", sc, |
2232 | task ? task->itt : 0); | |
6724add1 | 2233 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
2234 | return FAILED; |
2235 | } | |
2236 | EXPORT_SYMBOL_GPL(iscsi_eh_abort); | |
2237 | ||
843c0a8a MC |
2238 | static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr) |
2239 | { | |
2240 | memset(hdr, 0, sizeof(*hdr)); | |
2241 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
2242 | hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK; | |
2243 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
2244 | int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun); | |
f6d5180c | 2245 | hdr->rtt = RESERVED_ITT; |
843c0a8a MC |
2246 | } |
2247 | ||
2248 | int iscsi_eh_device_reset(struct scsi_cmnd *sc) | |
2249 | { | |
75613521 MC |
2250 | struct iscsi_cls_session *cls_session; |
2251 | struct iscsi_session *session; | |
843c0a8a MC |
2252 | struct iscsi_conn *conn; |
2253 | struct iscsi_tm *hdr; | |
2254 | int rc = FAILED; | |
2255 | ||
75613521 MC |
2256 | cls_session = starget_to_session(scsi_target(sc->device)); |
2257 | session = cls_session->dd_data; | |
2258 | ||
bd2199d4 | 2259 | ISCSI_DBG_EH(session, "LU Reset [sc %p lun %u]\n", sc, sc->device->lun); |
843c0a8a MC |
2260 | |
2261 | mutex_lock(&session->eh_mutex); | |
2262 | spin_lock_bh(&session->lock); | |
2263 | /* | |
2264 | * Just check if we are not logged in. We cannot check for | |
2265 | * the phase because the reset could come from a ioctl. | |
2266 | */ | |
2267 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN) | |
2268 | goto unlock; | |
2269 | conn = session->leadconn; | |
2270 | ||
2271 | /* only have one tmf outstanding at a time */ | |
2272 | if (conn->tmf_state != TMF_INITIAL) | |
2273 | goto unlock; | |
2274 | conn->tmf_state = TMF_QUEUED; | |
2275 | ||
2276 | hdr = &conn->tmhdr; | |
2277 | iscsi_prep_lun_reset_pdu(sc, hdr); | |
2278 | ||
9c19a7d0 | 2279 | if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age, |
f6d5180c | 2280 | session->lu_reset_timeout)) { |
843c0a8a MC |
2281 | rc = FAILED; |
2282 | goto unlock; | |
2283 | } | |
2284 | ||
2285 | switch (conn->tmf_state) { | |
2286 | case TMF_SUCCESS: | |
2287 | break; | |
2288 | case TMF_TIMEDOUT: | |
2289 | spin_unlock_bh(&session->lock); | |
2290 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
2291 | goto done; | |
2292 | default: | |
2293 | conn->tmf_state = TMF_INITIAL; | |
2294 | goto unlock; | |
2295 | } | |
2296 | ||
2297 | rc = SUCCESS; | |
2298 | spin_unlock_bh(&session->lock); | |
2299 | ||
2300 | iscsi_suspend_tx(conn); | |
913e5bf4 | 2301 | |
a3439148 | 2302 | spin_lock_bh(&session->lock); |
5d12c05e | 2303 | memset(hdr, 0, sizeof(*hdr)); |
3bbaaad9 | 2304 | fail_scsi_tasks(conn, sc->device->lun, DID_ERROR); |
843c0a8a | 2305 | conn->tmf_state = TMF_INITIAL; |
a3439148 | 2306 | spin_unlock_bh(&session->lock); |
843c0a8a MC |
2307 | |
2308 | iscsi_start_tx(conn); | |
2309 | goto done; | |
2310 | ||
2311 | unlock: | |
2312 | spin_unlock_bh(&session->lock); | |
2313 | done: | |
bd2199d4 EZ |
2314 | ISCSI_DBG_EH(session, "dev reset result = %s\n", |
2315 | rc == SUCCESS ? "SUCCESS" : "FAILED"); | |
843c0a8a MC |
2316 | mutex_unlock(&session->eh_mutex); |
2317 | return rc; | |
2318 | } | |
2319 | EXPORT_SYMBOL_GPL(iscsi_eh_device_reset); | |
2320 | ||
3fe5ae8b MC |
2321 | void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session) |
2322 | { | |
2323 | struct iscsi_session *session = cls_session->dd_data; | |
2324 | ||
2325 | spin_lock_bh(&session->lock); | |
2326 | if (session->state != ISCSI_STATE_LOGGED_IN) { | |
2327 | session->state = ISCSI_STATE_RECOVERY_FAILED; | |
2328 | if (session->leadconn) | |
2329 | wake_up(&session->leadconn->ehwait); | |
2330 | } | |
2331 | spin_unlock_bh(&session->lock); | |
2332 | } | |
2333 | EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout); | |
2334 | ||
2335 | /** | |
2336 | * iscsi_eh_session_reset - drop session and attempt relogin | |
2337 | * @sc: scsi command | |
2338 | * | |
2339 | * This function will wait for a relogin, session termination from | |
2340 | * userspace, or a recovery/replacement timeout. | |
2341 | */ | |
309ce156 | 2342 | int iscsi_eh_session_reset(struct scsi_cmnd *sc) |
3fe5ae8b MC |
2343 | { |
2344 | struct iscsi_cls_session *cls_session; | |
2345 | struct iscsi_session *session; | |
2346 | struct iscsi_conn *conn; | |
2347 | ||
2348 | cls_session = starget_to_session(scsi_target(sc->device)); | |
2349 | session = cls_session->dd_data; | |
2350 | conn = session->leadconn; | |
2351 | ||
2352 | mutex_lock(&session->eh_mutex); | |
2353 | spin_lock_bh(&session->lock); | |
2354 | if (session->state == ISCSI_STATE_TERMINATE) { | |
2355 | failed: | |
2356 | ISCSI_DBG_EH(session, | |
2357 | "failing session reset: Could not log back into " | |
2358 | "%s, %s [age %d]\n", session->targetname, | |
2359 | conn->persistent_address, session->age); | |
2360 | spin_unlock_bh(&session->lock); | |
2361 | mutex_unlock(&session->eh_mutex); | |
2362 | return FAILED; | |
2363 | } | |
2364 | ||
2365 | spin_unlock_bh(&session->lock); | |
2366 | mutex_unlock(&session->eh_mutex); | |
2367 | /* | |
2368 | * we drop the lock here but the leadconn cannot be destoyed while | |
2369 | * we are in the scsi eh | |
2370 | */ | |
2371 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
2372 | ||
2373 | ISCSI_DBG_EH(session, "wait for relogin\n"); | |
2374 | wait_event_interruptible(conn->ehwait, | |
2375 | session->state == ISCSI_STATE_TERMINATE || | |
2376 | session->state == ISCSI_STATE_LOGGED_IN || | |
2377 | session->state == ISCSI_STATE_RECOVERY_FAILED); | |
2378 | if (signal_pending(current)) | |
2379 | flush_signals(current); | |
2380 | ||
2381 | mutex_lock(&session->eh_mutex); | |
2382 | spin_lock_bh(&session->lock); | |
2383 | if (session->state == ISCSI_STATE_LOGGED_IN) { | |
2384 | ISCSI_DBG_EH(session, | |
2385 | "session reset succeeded for %s,%s\n", | |
2386 | session->targetname, conn->persistent_address); | |
2387 | } else | |
2388 | goto failed; | |
2389 | spin_unlock_bh(&session->lock); | |
2390 | mutex_unlock(&session->eh_mutex); | |
2391 | return SUCCESS; | |
2392 | } | |
309ce156 | 2393 | EXPORT_SYMBOL_GPL(iscsi_eh_session_reset); |
3fe5ae8b MC |
2394 | |
2395 | static void iscsi_prep_tgt_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr) | |
2396 | { | |
2397 | memset(hdr, 0, sizeof(*hdr)); | |
2398 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
2399 | hdr->flags = ISCSI_TM_FUNC_TARGET_WARM_RESET & ISCSI_FLAG_TM_FUNC_MASK; | |
2400 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
2401 | hdr->rtt = RESERVED_ITT; | |
2402 | } | |
2403 | ||
2404 | /** | |
2405 | * iscsi_eh_target_reset - reset target | |
2406 | * @sc: scsi command | |
2407 | * | |
309ce156 | 2408 | * This will attempt to send a warm target reset. |
3fe5ae8b MC |
2409 | */ |
2410 | int iscsi_eh_target_reset(struct scsi_cmnd *sc) | |
2411 | { | |
2412 | struct iscsi_cls_session *cls_session; | |
2413 | struct iscsi_session *session; | |
2414 | struct iscsi_conn *conn; | |
2415 | struct iscsi_tm *hdr; | |
2416 | int rc = FAILED; | |
2417 | ||
2418 | cls_session = starget_to_session(scsi_target(sc->device)); | |
2419 | session = cls_session->dd_data; | |
2420 | ||
2421 | ISCSI_DBG_EH(session, "tgt Reset [sc %p tgt %s]\n", sc, | |
2422 | session->targetname); | |
2423 | ||
2424 | mutex_lock(&session->eh_mutex); | |
2425 | spin_lock_bh(&session->lock); | |
2426 | /* | |
2427 | * Just check if we are not logged in. We cannot check for | |
2428 | * the phase because the reset could come from a ioctl. | |
2429 | */ | |
2430 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN) | |
2431 | goto unlock; | |
2432 | conn = session->leadconn; | |
2433 | ||
2434 | /* only have one tmf outstanding at a time */ | |
2435 | if (conn->tmf_state != TMF_INITIAL) | |
2436 | goto unlock; | |
2437 | conn->tmf_state = TMF_QUEUED; | |
2438 | ||
2439 | hdr = &conn->tmhdr; | |
2440 | iscsi_prep_tgt_reset_pdu(sc, hdr); | |
2441 | ||
2442 | if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age, | |
2443 | session->tgt_reset_timeout)) { | |
2444 | rc = FAILED; | |
2445 | goto unlock; | |
2446 | } | |
2447 | ||
2448 | switch (conn->tmf_state) { | |
2449 | case TMF_SUCCESS: | |
2450 | break; | |
2451 | case TMF_TIMEDOUT: | |
2452 | spin_unlock_bh(&session->lock); | |
2453 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
2454 | goto done; | |
2455 | default: | |
2456 | conn->tmf_state = TMF_INITIAL; | |
2457 | goto unlock; | |
2458 | } | |
2459 | ||
2460 | rc = SUCCESS; | |
2461 | spin_unlock_bh(&session->lock); | |
2462 | ||
2463 | iscsi_suspend_tx(conn); | |
2464 | ||
2465 | spin_lock_bh(&session->lock); | |
2466 | memset(hdr, 0, sizeof(*hdr)); | |
2467 | fail_scsi_tasks(conn, -1, DID_ERROR); | |
2468 | conn->tmf_state = TMF_INITIAL; | |
2469 | spin_unlock_bh(&session->lock); | |
2470 | ||
2471 | iscsi_start_tx(conn); | |
2472 | goto done; | |
2473 | ||
2474 | unlock: | |
2475 | spin_unlock_bh(&session->lock); | |
2476 | done: | |
2477 | ISCSI_DBG_EH(session, "tgt %s reset result = %s\n", session->targetname, | |
2478 | rc == SUCCESS ? "SUCCESS" : "FAILED"); | |
2479 | mutex_unlock(&session->eh_mutex); | |
309ce156 JK |
2480 | return rc; |
2481 | } | |
2482 | EXPORT_SYMBOL_GPL(iscsi_eh_target_reset); | |
3fe5ae8b | 2483 | |
309ce156 JK |
2484 | /** |
2485 | * iscsi_eh_recover_target - reset target and possibly the session | |
2486 | * @sc: scsi command | |
2487 | * | |
2488 | * This will attempt to send a warm target reset. If that fails, | |
2489 | * we will escalate to ERL0 session recovery. | |
2490 | */ | |
2491 | int iscsi_eh_recover_target(struct scsi_cmnd *sc) | |
2492 | { | |
2493 | int rc; | |
2494 | ||
2495 | rc = iscsi_eh_target_reset(sc); | |
3fe5ae8b MC |
2496 | if (rc == FAILED) |
2497 | rc = iscsi_eh_session_reset(sc); | |
2498 | return rc; | |
2499 | } | |
309ce156 | 2500 | EXPORT_SYMBOL_GPL(iscsi_eh_recover_target); |
3fe5ae8b | 2501 | |
6320377f OK |
2502 | /* |
2503 | * Pre-allocate a pool of @max items of @item_size. By default, the pool | |
2504 | * should be accessed via kfifo_{get,put} on q->queue. | |
2505 | * Optionally, the caller can obtain the array of object pointers | |
2506 | * by passing in a non-NULL @items pointer | |
2507 | */ | |
7996a778 | 2508 | int |
6320377f | 2509 | iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size) |
7996a778 | 2510 | { |
6320377f | 2511 | int i, num_arrays = 1; |
7996a778 | 2512 | |
6320377f | 2513 | memset(q, 0, sizeof(*q)); |
7996a778 MC |
2514 | |
2515 | q->max = max; | |
6320377f OK |
2516 | |
2517 | /* If the user passed an items pointer, he wants a copy of | |
2518 | * the array. */ | |
2519 | if (items) | |
2520 | num_arrays++; | |
2521 | q->pool = kzalloc(num_arrays * max * sizeof(void*), GFP_KERNEL); | |
2522 | if (q->pool == NULL) | |
f474a37b | 2523 | return -ENOMEM; |
7996a778 | 2524 | |
c1e13f25 | 2525 | kfifo_init(&q->queue, (void*)q->pool, max * sizeof(void*)); |
7996a778 MC |
2526 | |
2527 | for (i = 0; i < max; i++) { | |
6320377f | 2528 | q->pool[i] = kzalloc(item_size, GFP_KERNEL); |
7996a778 | 2529 | if (q->pool[i] == NULL) { |
6320377f OK |
2530 | q->max = i; |
2531 | goto enomem; | |
7996a778 | 2532 | } |
7acd72eb | 2533 | kfifo_in(&q->queue, (void*)&q->pool[i], sizeof(void*)); |
7996a778 | 2534 | } |
6320377f OK |
2535 | |
2536 | if (items) { | |
2537 | *items = q->pool + max; | |
2538 | memcpy(*items, q->pool, max * sizeof(void *)); | |
2539 | } | |
2540 | ||
7996a778 | 2541 | return 0; |
6320377f OK |
2542 | |
2543 | enomem: | |
2544 | iscsi_pool_free(q); | |
2545 | return -ENOMEM; | |
7996a778 MC |
2546 | } |
2547 | EXPORT_SYMBOL_GPL(iscsi_pool_init); | |
2548 | ||
6320377f | 2549 | void iscsi_pool_free(struct iscsi_pool *q) |
7996a778 MC |
2550 | { |
2551 | int i; | |
2552 | ||
2553 | for (i = 0; i < q->max; i++) | |
6320377f | 2554 | kfree(q->pool[i]); |
f474a37b | 2555 | kfree(q->pool); |
7996a778 MC |
2556 | } |
2557 | EXPORT_SYMBOL_GPL(iscsi_pool_free); | |
2558 | ||
a4804cd6 MC |
2559 | /** |
2560 | * iscsi_host_add - add host to system | |
2561 | * @shost: scsi host | |
2562 | * @pdev: parent device | |
2563 | * | |
2564 | * This should be called by partial offload and software iscsi drivers | |
2565 | * to add a host to the system. | |
2566 | */ | |
2567 | int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev) | |
2568 | { | |
8e9a20ce MC |
2569 | if (!shost->can_queue) |
2570 | shost->can_queue = ISCSI_DEF_XMIT_CMDS_MAX; | |
2571 | ||
4d108350 MC |
2572 | if (!shost->cmd_per_lun) |
2573 | shost->cmd_per_lun = ISCSI_DEF_CMD_PER_LUN; | |
2574 | ||
308cec14 MC |
2575 | if (!shost->transportt->eh_timed_out) |
2576 | shost->transportt->eh_timed_out = iscsi_eh_cmd_timed_out; | |
a4804cd6 MC |
2577 | return scsi_add_host(shost, pdev); |
2578 | } | |
2579 | EXPORT_SYMBOL_GPL(iscsi_host_add); | |
2580 | ||
2581 | /** | |
2582 | * iscsi_host_alloc - allocate a host and driver data | |
2583 | * @sht: scsi host template | |
2584 | * @dd_data_size: driver host data size | |
32ae763e | 2585 | * @xmit_can_sleep: bool indicating if LLD will queue IO from a work queue |
a4804cd6 MC |
2586 | * |
2587 | * This should be called by partial offload and software iscsi drivers. | |
2588 | * To access the driver specific memory use the iscsi_host_priv() macro. | |
2589 | */ | |
2590 | struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht, | |
4d108350 | 2591 | int dd_data_size, bool xmit_can_sleep) |
75613521 | 2592 | { |
a4804cd6 | 2593 | struct Scsi_Host *shost; |
e5bd7b54 | 2594 | struct iscsi_host *ihost; |
a4804cd6 MC |
2595 | |
2596 | shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size); | |
2597 | if (!shost) | |
2598 | return NULL; | |
e5bd7b54 | 2599 | ihost = shost_priv(shost); |
32ae763e MC |
2600 | |
2601 | if (xmit_can_sleep) { | |
2602 | snprintf(ihost->workq_name, sizeof(ihost->workq_name), | |
2603 | "iscsi_q_%d", shost->host_no); | |
2604 | ihost->workq = create_singlethread_workqueue(ihost->workq_name); | |
2605 | if (!ihost->workq) | |
2606 | goto free_host; | |
2607 | } | |
2608 | ||
e5bd7b54 MC |
2609 | spin_lock_init(&ihost->lock); |
2610 | ihost->state = ISCSI_HOST_SETUP; | |
2611 | ihost->num_sessions = 0; | |
2612 | init_waitqueue_head(&ihost->session_removal_wq); | |
a4804cd6 | 2613 | return shost; |
32ae763e MC |
2614 | |
2615 | free_host: | |
2616 | scsi_host_put(shost); | |
2617 | return NULL; | |
a4804cd6 MC |
2618 | } |
2619 | EXPORT_SYMBOL_GPL(iscsi_host_alloc); | |
2620 | ||
e5bd7b54 MC |
2621 | static void iscsi_notify_host_removed(struct iscsi_cls_session *cls_session) |
2622 | { | |
40a06e75 | 2623 | iscsi_session_failure(cls_session->dd_data, ISCSI_ERR_INVALID_HOST); |
e5bd7b54 MC |
2624 | } |
2625 | ||
a4804cd6 MC |
2626 | /** |
2627 | * iscsi_host_remove - remove host and sessions | |
2628 | * @shost: scsi host | |
2629 | * | |
e5bd7b54 MC |
2630 | * If there are any sessions left, this will initiate the removal and wait |
2631 | * for the completion. | |
a4804cd6 MC |
2632 | */ |
2633 | void iscsi_host_remove(struct Scsi_Host *shost) | |
2634 | { | |
e5bd7b54 MC |
2635 | struct iscsi_host *ihost = shost_priv(shost); |
2636 | unsigned long flags; | |
2637 | ||
2638 | spin_lock_irqsave(&ihost->lock, flags); | |
2639 | ihost->state = ISCSI_HOST_REMOVED; | |
2640 | spin_unlock_irqrestore(&ihost->lock, flags); | |
2641 | ||
2642 | iscsi_host_for_each_session(shost, iscsi_notify_host_removed); | |
2643 | wait_event_interruptible(ihost->session_removal_wq, | |
2644 | ihost->num_sessions == 0); | |
2645 | if (signal_pending(current)) | |
2646 | flush_signals(current); | |
2647 | ||
a4804cd6 | 2648 | scsi_remove_host(shost); |
32ae763e MC |
2649 | if (ihost->workq) |
2650 | destroy_workqueue(ihost->workq); | |
75613521 | 2651 | } |
a4804cd6 | 2652 | EXPORT_SYMBOL_GPL(iscsi_host_remove); |
7996a778 | 2653 | |
a4804cd6 | 2654 | void iscsi_host_free(struct Scsi_Host *shost) |
75613521 MC |
2655 | { |
2656 | struct iscsi_host *ihost = shost_priv(shost); | |
7996a778 | 2657 | |
75613521 MC |
2658 | kfree(ihost->netdev); |
2659 | kfree(ihost->hwaddress); | |
2660 | kfree(ihost->initiatorname); | |
a4804cd6 | 2661 | scsi_host_put(shost); |
75613521 | 2662 | } |
a4804cd6 | 2663 | EXPORT_SYMBOL_GPL(iscsi_host_free); |
7996a778 | 2664 | |
e5bd7b54 MC |
2665 | static void iscsi_host_dec_session_cnt(struct Scsi_Host *shost) |
2666 | { | |
2667 | struct iscsi_host *ihost = shost_priv(shost); | |
2668 | unsigned long flags; | |
2669 | ||
2670 | shost = scsi_host_get(shost); | |
2671 | if (!shost) { | |
2672 | printk(KERN_ERR "Invalid state. Cannot notify host removal " | |
2673 | "of session teardown event because host already " | |
2674 | "removed.\n"); | |
2675 | return; | |
2676 | } | |
2677 | ||
2678 | spin_lock_irqsave(&ihost->lock, flags); | |
2679 | ihost->num_sessions--; | |
2680 | if (ihost->num_sessions == 0) | |
2681 | wake_up(&ihost->session_removal_wq); | |
2682 | spin_unlock_irqrestore(&ihost->lock, flags); | |
2683 | scsi_host_put(shost); | |
2684 | } | |
2685 | ||
7996a778 MC |
2686 | /** |
2687 | * iscsi_session_setup - create iscsi cls session and host and session | |
7996a778 | 2688 | * @iscsit: iscsi transport template |
75613521 MC |
2689 | * @shost: scsi host |
2690 | * @cmds_max: session can queue | |
9c19a7d0 | 2691 | * @cmd_task_size: LLD task private data size |
7996a778 | 2692 | * @initial_cmdsn: initial CmdSN |
7996a778 MC |
2693 | * |
2694 | * This can be used by software iscsi_transports that allocate | |
2695 | * a session per scsi host. | |
3cf7b233 MC |
2696 | * |
2697 | * Callers should set cmds_max to the largest total numer (mgmt + scsi) of | |
2698 | * tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks | |
2699 | * for nop handling and login/logout requests. | |
75613521 | 2700 | */ |
7996a778 | 2701 | struct iscsi_cls_session * |
75613521 | 2702 | iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost, |
b8b9e1b8 | 2703 | uint16_t cmds_max, int dd_size, int cmd_task_size, |
7970634b | 2704 | uint32_t initial_cmdsn, unsigned int id) |
7996a778 | 2705 | { |
e5bd7b54 | 2706 | struct iscsi_host *ihost = shost_priv(shost); |
7996a778 MC |
2707 | struct iscsi_session *session; |
2708 | struct iscsi_cls_session *cls_session; | |
3cf7b233 | 2709 | int cmd_i, scsi_cmds, total_cmds = cmds_max; |
e5bd7b54 MC |
2710 | unsigned long flags; |
2711 | ||
2712 | spin_lock_irqsave(&ihost->lock, flags); | |
2713 | if (ihost->state == ISCSI_HOST_REMOVED) { | |
2714 | spin_unlock_irqrestore(&ihost->lock, flags); | |
2715 | return NULL; | |
2716 | } | |
2717 | ihost->num_sessions++; | |
2718 | spin_unlock_irqrestore(&ihost->lock, flags); | |
8e9a20ce MC |
2719 | |
2720 | if (!total_cmds) | |
2721 | total_cmds = ISCSI_DEF_XMIT_CMDS_MAX; | |
3e5c28ad | 2722 | /* |
3cf7b233 MC |
2723 | * The iscsi layer needs some tasks for nop handling and tmfs, |
2724 | * so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX | |
2725 | * + 1 command for scsi IO. | |
3e5c28ad | 2726 | */ |
3cf7b233 MC |
2727 | if (total_cmds < ISCSI_TOTAL_CMDS_MIN) { |
2728 | printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " | |
2729 | "must be a power of two that is at least %d.\n", | |
2730 | total_cmds, ISCSI_TOTAL_CMDS_MIN); | |
e5bd7b54 | 2731 | goto dec_session_count; |
3cf7b233 MC |
2732 | } |
2733 | ||
2734 | if (total_cmds > ISCSI_TOTAL_CMDS_MAX) { | |
2735 | printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " | |
2736 | "must be a power of 2 less than or equal to %d.\n", | |
2737 | cmds_max, ISCSI_TOTAL_CMDS_MAX); | |
2738 | total_cmds = ISCSI_TOTAL_CMDS_MAX; | |
2739 | } | |
2740 | ||
2741 | if (!is_power_of_2(total_cmds)) { | |
2742 | printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " | |
2743 | "must be a power of 2.\n", total_cmds); | |
2744 | total_cmds = rounddown_pow_of_two(total_cmds); | |
2745 | if (total_cmds < ISCSI_TOTAL_CMDS_MIN) | |
2746 | return NULL; | |
2747 | printk(KERN_INFO "iscsi: Rounding can_queue to %d.\n", | |
2748 | total_cmds); | |
1548271e | 2749 | } |
3cf7b233 | 2750 | scsi_cmds = total_cmds - ISCSI_MGMT_CMDS_MAX; |
1548271e | 2751 | |
5d91e209 | 2752 | cls_session = iscsi_alloc_session(shost, iscsit, |
b8b9e1b8 JK |
2753 | sizeof(struct iscsi_session) + |
2754 | dd_size); | |
75613521 | 2755 | if (!cls_session) |
e5bd7b54 | 2756 | goto dec_session_count; |
75613521 MC |
2757 | session = cls_session->dd_data; |
2758 | session->cls_session = cls_session; | |
7996a778 MC |
2759 | session->host = shost; |
2760 | session->state = ISCSI_STATE_FREE; | |
f6d5180c | 2761 | session->fast_abort = 1; |
3fe5ae8b | 2762 | session->tgt_reset_timeout = 30; |
4cd49ea1 MC |
2763 | session->lu_reset_timeout = 15; |
2764 | session->abort_timeout = 10; | |
3cf7b233 MC |
2765 | session->scsi_cmds_max = scsi_cmds; |
2766 | session->cmds_max = total_cmds; | |
e0726407 | 2767 | session->queued_cmdsn = session->cmdsn = initial_cmdsn; |
7996a778 MC |
2768 | session->exp_cmdsn = initial_cmdsn + 1; |
2769 | session->max_cmdsn = initial_cmdsn + 1; | |
2770 | session->max_r2t = 1; | |
2771 | session->tt = iscsit; | |
b8b9e1b8 | 2772 | session->dd_data = cls_session->dd_data + sizeof(*session); |
6724add1 | 2773 | mutex_init(&session->eh_mutex); |
75613521 | 2774 | spin_lock_init(&session->lock); |
7996a778 MC |
2775 | |
2776 | /* initialize SCSI PDU commands pool */ | |
2777 | if (iscsi_pool_init(&session->cmdpool, session->cmds_max, | |
2778 | (void***)&session->cmds, | |
9c19a7d0 | 2779 | cmd_task_size + sizeof(struct iscsi_task))) |
7996a778 MC |
2780 | goto cmdpool_alloc_fail; |
2781 | ||
2782 | /* pre-format cmds pool with ITT */ | |
2783 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
9c19a7d0 | 2784 | struct iscsi_task *task = session->cmds[cmd_i]; |
7996a778 | 2785 | |
9c19a7d0 MC |
2786 | if (cmd_task_size) |
2787 | task->dd_data = &task[1]; | |
2788 | task->itt = cmd_i; | |
3bbaaad9 | 2789 | task->state = ISCSI_TASK_FREE; |
9c19a7d0 | 2790 | INIT_LIST_HEAD(&task->running); |
7996a778 MC |
2791 | } |
2792 | ||
f53a88da | 2793 | if (!try_module_get(iscsit->owner)) |
75613521 | 2794 | goto module_get_fail; |
7996a778 | 2795 | |
7970634b | 2796 | if (iscsi_add_session(cls_session, id)) |
75613521 | 2797 | goto cls_session_fail; |
e5bd7b54 | 2798 | |
7996a778 MC |
2799 | return cls_session; |
2800 | ||
2801 | cls_session_fail: | |
75613521 MC |
2802 | module_put(iscsit->owner); |
2803 | module_get_fail: | |
6320377f | 2804 | iscsi_pool_free(&session->cmdpool); |
7996a778 | 2805 | cmdpool_alloc_fail: |
75613521 | 2806 | iscsi_free_session(cls_session); |
e5bd7b54 MC |
2807 | dec_session_count: |
2808 | iscsi_host_dec_session_cnt(shost); | |
7996a778 MC |
2809 | return NULL; |
2810 | } | |
2811 | EXPORT_SYMBOL_GPL(iscsi_session_setup); | |
2812 | ||
2813 | /** | |
2814 | * iscsi_session_teardown - destroy session, host, and cls_session | |
75613521 | 2815 | * @cls_session: iscsi session |
7996a778 | 2816 | * |
75613521 MC |
2817 | * The driver must have called iscsi_remove_session before |
2818 | * calling this. | |
2819 | */ | |
7996a778 MC |
2820 | void iscsi_session_teardown(struct iscsi_cls_session *cls_session) |
2821 | { | |
75613521 | 2822 | struct iscsi_session *session = cls_session->dd_data; |
63f75cc8 | 2823 | struct module *owner = cls_session->transport->owner; |
e5bd7b54 | 2824 | struct Scsi_Host *shost = session->host; |
7996a778 | 2825 | |
6320377f | 2826 | iscsi_pool_free(&session->cmdpool); |
7996a778 | 2827 | |
b2c64167 MC |
2828 | kfree(session->password); |
2829 | kfree(session->password_in); | |
2830 | kfree(session->username); | |
2831 | kfree(session->username_in); | |
f3ff0c36 | 2832 | kfree(session->targetname); |
88dfd340 MC |
2833 | kfree(session->initiatorname); |
2834 | kfree(session->ifacename); | |
f3ff0c36 | 2835 | |
75613521 | 2836 | iscsi_destroy_session(cls_session); |
e5bd7b54 | 2837 | iscsi_host_dec_session_cnt(shost); |
63f75cc8 | 2838 | module_put(owner); |
7996a778 MC |
2839 | } |
2840 | EXPORT_SYMBOL_GPL(iscsi_session_teardown); | |
2841 | ||
2842 | /** | |
2843 | * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn | |
2844 | * @cls_session: iscsi_cls_session | |
5d91e209 | 2845 | * @dd_size: private driver data size |
7996a778 | 2846 | * @conn_idx: cid |
5d91e209 | 2847 | */ |
7996a778 | 2848 | struct iscsi_cls_conn * |
5d91e209 MC |
2849 | iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size, |
2850 | uint32_t conn_idx) | |
7996a778 | 2851 | { |
75613521 | 2852 | struct iscsi_session *session = cls_session->dd_data; |
7996a778 MC |
2853 | struct iscsi_conn *conn; |
2854 | struct iscsi_cls_conn *cls_conn; | |
d36ab6f3 | 2855 | char *data; |
7996a778 | 2856 | |
5d91e209 MC |
2857 | cls_conn = iscsi_create_conn(cls_session, sizeof(*conn) + dd_size, |
2858 | conn_idx); | |
7996a778 MC |
2859 | if (!cls_conn) |
2860 | return NULL; | |
2861 | conn = cls_conn->dd_data; | |
5d91e209 | 2862 | memset(conn, 0, sizeof(*conn) + dd_size); |
7996a778 | 2863 | |
5d91e209 | 2864 | conn->dd_data = cls_conn->dd_data + sizeof(*conn); |
7996a778 MC |
2865 | conn->session = session; |
2866 | conn->cls_conn = cls_conn; | |
2867 | conn->c_stage = ISCSI_CONN_INITIAL_STAGE; | |
2868 | conn->id = conn_idx; | |
2869 | conn->exp_statsn = 0; | |
843c0a8a | 2870 | conn->tmf_state = TMF_INITIAL; |
f6d5180c MC |
2871 | |
2872 | init_timer(&conn->transport_timer); | |
2873 | conn->transport_timer.data = (unsigned long)conn; | |
2874 | conn->transport_timer.function = iscsi_check_transport_timeouts; | |
2875 | ||
843c0a8a | 2876 | INIT_LIST_HEAD(&conn->mgmtqueue); |
3bbaaad9 | 2877 | INIT_LIST_HEAD(&conn->cmdqueue); |
843c0a8a | 2878 | INIT_LIST_HEAD(&conn->requeue); |
c4028958 | 2879 | INIT_WORK(&conn->xmitwork, iscsi_xmitworker); |
7996a778 | 2880 | |
9c19a7d0 | 2881 | /* allocate login_task used for the login/text sequences */ |
7996a778 | 2882 | spin_lock_bh(&session->lock); |
7acd72eb | 2883 | if (!kfifo_out(&session->cmdpool.queue, |
9c19a7d0 | 2884 | (void*)&conn->login_task, |
7996a778 MC |
2885 | sizeof(void*))) { |
2886 | spin_unlock_bh(&session->lock); | |
9c19a7d0 | 2887 | goto login_task_alloc_fail; |
7996a778 MC |
2888 | } |
2889 | spin_unlock_bh(&session->lock); | |
2890 | ||
cfeb2cf9 MC |
2891 | data = (char *) __get_free_pages(GFP_KERNEL, |
2892 | get_order(ISCSI_DEF_MAX_RECV_SEG_LEN)); | |
d36ab6f3 | 2893 | if (!data) |
9c19a7d0 MC |
2894 | goto login_task_data_alloc_fail; |
2895 | conn->login_task->data = conn->data = data; | |
d36ab6f3 | 2896 | |
843c0a8a | 2897 | init_timer(&conn->tmf_timer); |
7996a778 MC |
2898 | init_waitqueue_head(&conn->ehwait); |
2899 | ||
2900 | return cls_conn; | |
2901 | ||
9c19a7d0 | 2902 | login_task_data_alloc_fail: |
7acd72eb | 2903 | kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task, |
d36ab6f3 | 2904 | sizeof(void*)); |
9c19a7d0 | 2905 | login_task_alloc_fail: |
7996a778 MC |
2906 | iscsi_destroy_conn(cls_conn); |
2907 | return NULL; | |
2908 | } | |
2909 | EXPORT_SYMBOL_GPL(iscsi_conn_setup); | |
2910 | ||
2911 | /** | |
2912 | * iscsi_conn_teardown - teardown iscsi connection | |
2913 | * cls_conn: iscsi class connection | |
2914 | * | |
2915 | * TODO: we may need to make this into a two step process | |
2916 | * like scsi-mls remove + put host | |
2917 | */ | |
2918 | void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn) | |
2919 | { | |
2920 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2921 | struct iscsi_session *session = conn->session; | |
2922 | unsigned long flags; | |
2923 | ||
f6d5180c MC |
2924 | del_timer_sync(&conn->transport_timer); |
2925 | ||
7996a778 MC |
2926 | spin_lock_bh(&session->lock); |
2927 | conn->c_stage = ISCSI_CONN_CLEANUP_WAIT; | |
2928 | if (session->leadconn == conn) { | |
2929 | /* | |
2930 | * leading connection? then give up on recovery. | |
2931 | */ | |
2932 | session->state = ISCSI_STATE_TERMINATE; | |
2933 | wake_up(&conn->ehwait); | |
2934 | } | |
2935 | spin_unlock_bh(&session->lock); | |
2936 | ||
7996a778 MC |
2937 | /* |
2938 | * Block until all in-progress commands for this connection | |
2939 | * time out or fail. | |
2940 | */ | |
2941 | for (;;) { | |
2942 | spin_lock_irqsave(session->host->host_lock, flags); | |
2943 | if (!session->host->host_busy) { /* OK for ERL == 0 */ | |
2944 | spin_unlock_irqrestore(session->host->host_lock, flags); | |
2945 | break; | |
2946 | } | |
2947 | spin_unlock_irqrestore(session->host->host_lock, flags); | |
2948 | msleep_interruptible(500); | |
322d739d MC |
2949 | iscsi_conn_printk(KERN_INFO, conn, "iscsi conn_destroy(): " |
2950 | "host_busy %d host_failed %d\n", | |
2951 | session->host->host_busy, | |
2952 | session->host->host_failed); | |
7996a778 MC |
2953 | /* |
2954 | * force eh_abort() to unblock | |
2955 | */ | |
2956 | wake_up(&conn->ehwait); | |
2957 | } | |
2958 | ||
779ea120 | 2959 | /* flush queued up work because we free the connection below */ |
843c0a8a | 2960 | iscsi_suspend_tx(conn); |
779ea120 | 2961 | |
7996a778 | 2962 | spin_lock_bh(&session->lock); |
cfeb2cf9 MC |
2963 | free_pages((unsigned long) conn->data, |
2964 | get_order(ISCSI_DEF_MAX_RECV_SEG_LEN)); | |
f3ff0c36 | 2965 | kfree(conn->persistent_address); |
7acd72eb | 2966 | kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task, |
7996a778 | 2967 | sizeof(void*)); |
e0726407 | 2968 | if (session->leadconn == conn) |
7996a778 | 2969 | session->leadconn = NULL; |
7996a778 MC |
2970 | spin_unlock_bh(&session->lock); |
2971 | ||
7996a778 MC |
2972 | iscsi_destroy_conn(cls_conn); |
2973 | } | |
2974 | EXPORT_SYMBOL_GPL(iscsi_conn_teardown); | |
2975 | ||
2976 | int iscsi_conn_start(struct iscsi_cls_conn *cls_conn) | |
2977 | { | |
2978 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2979 | struct iscsi_session *session = conn->session; | |
2980 | ||
ffd0436e | 2981 | if (!session) { |
322d739d MC |
2982 | iscsi_conn_printk(KERN_ERR, conn, |
2983 | "can't start unbound connection\n"); | |
7996a778 MC |
2984 | return -EPERM; |
2985 | } | |
2986 | ||
db98ccde MC |
2987 | if ((session->imm_data_en || !session->initial_r2t_en) && |
2988 | session->first_burst > session->max_burst) { | |
322d739d MC |
2989 | iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: " |
2990 | "first_burst %d max_burst %d\n", | |
2991 | session->first_burst, session->max_burst); | |
ffd0436e MC |
2992 | return -EINVAL; |
2993 | } | |
2994 | ||
f6d5180c | 2995 | if (conn->ping_timeout && !conn->recv_timeout) { |
322d739d MC |
2996 | iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of " |
2997 | "zero. Using 5 seconds\n."); | |
f6d5180c MC |
2998 | conn->recv_timeout = 5; |
2999 | } | |
3000 | ||
3001 | if (conn->recv_timeout && !conn->ping_timeout) { | |
322d739d MC |
3002 | iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of " |
3003 | "zero. Using 5 seconds.\n"); | |
f6d5180c MC |
3004 | conn->ping_timeout = 5; |
3005 | } | |
3006 | ||
7996a778 MC |
3007 | spin_lock_bh(&session->lock); |
3008 | conn->c_stage = ISCSI_CONN_STARTED; | |
3009 | session->state = ISCSI_STATE_LOGGED_IN; | |
e0726407 | 3010 | session->queued_cmdsn = session->cmdsn; |
7996a778 | 3011 | |
f6d5180c MC |
3012 | conn->last_recv = jiffies; |
3013 | conn->last_ping = jiffies; | |
3014 | if (conn->recv_timeout && conn->ping_timeout) | |
3015 | mod_timer(&conn->transport_timer, | |
3016 | jiffies + (conn->recv_timeout * HZ)); | |
3017 | ||
7996a778 MC |
3018 | switch(conn->stop_stage) { |
3019 | case STOP_CONN_RECOVER: | |
3020 | /* | |
3021 | * unblock eh_abort() if it is blocked. re-try all | |
3022 | * commands after successful recovery | |
3023 | */ | |
7996a778 | 3024 | conn->stop_stage = 0; |
843c0a8a | 3025 | conn->tmf_state = TMF_INITIAL; |
7996a778 | 3026 | session->age++; |
8b1d0343 MC |
3027 | if (session->age == 16) |
3028 | session->age = 0; | |
6eabafbe | 3029 | break; |
7996a778 | 3030 | case STOP_CONN_TERM: |
7996a778 | 3031 | conn->stop_stage = 0; |
7996a778 MC |
3032 | break; |
3033 | default: | |
3034 | break; | |
3035 | } | |
3036 | spin_unlock_bh(&session->lock); | |
3037 | ||
75613521 | 3038 | iscsi_unblock_session(session->cls_session); |
6eabafbe | 3039 | wake_up(&conn->ehwait); |
7996a778 MC |
3040 | return 0; |
3041 | } | |
3042 | EXPORT_SYMBOL_GPL(iscsi_conn_start); | |
3043 | ||
3044 | static void | |
3bbaaad9 | 3045 | fail_mgmt_tasks(struct iscsi_session *session, struct iscsi_conn *conn) |
7996a778 | 3046 | { |
3bbaaad9 | 3047 | struct iscsi_task *task; |
b3cd5050 | 3048 | int i, state; |
7996a778 | 3049 | |
3bbaaad9 MC |
3050 | for (i = 0; i < conn->session->cmds_max; i++) { |
3051 | task = conn->session->cmds[i]; | |
3052 | if (task->sc) | |
3053 | continue; | |
7996a778 | 3054 | |
3bbaaad9 MC |
3055 | if (task->state == ISCSI_TASK_FREE) |
3056 | continue; | |
7996a778 | 3057 | |
3bbaaad9 MC |
3058 | ISCSI_DBG_SESSION(conn->session, |
3059 | "failing mgmt itt 0x%x state %d\n", | |
3060 | task->itt, task->state); | |
b3cd5050 MC |
3061 | state = ISCSI_TASK_ABRT_SESS_RECOV; |
3062 | if (task->state == ISCSI_TASK_PENDING) | |
3063 | state = ISCSI_TASK_COMPLETED; | |
3064 | iscsi_complete_task(task, state); | |
3065 | ||
3bbaaad9 | 3066 | } |
7996a778 MC |
3067 | } |
3068 | ||
656cffc9 MC |
3069 | static void iscsi_start_session_recovery(struct iscsi_session *session, |
3070 | struct iscsi_conn *conn, int flag) | |
7996a778 | 3071 | { |
ed2abc7f MC |
3072 | int old_stop_stage; |
3073 | ||
6724add1 | 3074 | mutex_lock(&session->eh_mutex); |
7996a778 | 3075 | spin_lock_bh(&session->lock); |
ed2abc7f | 3076 | if (conn->stop_stage == STOP_CONN_TERM) { |
7996a778 | 3077 | spin_unlock_bh(&session->lock); |
6724add1 MC |
3078 | mutex_unlock(&session->eh_mutex); |
3079 | return; | |
3080 | } | |
3081 | ||
ed2abc7f MC |
3082 | /* |
3083 | * When this is called for the in_login state, we only want to clean | |
9c19a7d0 | 3084 | * up the login task and connection. We do not need to block and set |
67a61114 | 3085 | * the recovery state again |
ed2abc7f | 3086 | */ |
67a61114 MC |
3087 | if (flag == STOP_CONN_TERM) |
3088 | session->state = ISCSI_STATE_TERMINATE; | |
3089 | else if (conn->stop_stage != STOP_CONN_RECOVER) | |
3090 | session->state = ISCSI_STATE_IN_RECOVERY; | |
4ae0a6c1 MC |
3091 | |
3092 | old_stop_stage = conn->stop_stage; | |
3093 | conn->stop_stage = flag; | |
26013ad4 | 3094 | spin_unlock_bh(&session->lock); |
ed2abc7f | 3095 | |
26013ad4 MC |
3096 | del_timer_sync(&conn->transport_timer); |
3097 | iscsi_suspend_tx(conn); | |
3098 | ||
3099 | spin_lock_bh(&session->lock); | |
67a61114 | 3100 | conn->c_stage = ISCSI_CONN_STOPPED; |
7996a778 | 3101 | spin_unlock_bh(&session->lock); |
6724add1 | 3102 | |
7996a778 MC |
3103 | /* |
3104 | * for connection level recovery we should not calculate | |
3105 | * header digest. conn->hdr_size used for optimization | |
3106 | * in hdr_extract() and will be re-negotiated at | |
3107 | * set_param() time. | |
3108 | */ | |
3109 | if (flag == STOP_CONN_RECOVER) { | |
3110 | conn->hdrdgst_en = 0; | |
3111 | conn->datadgst_en = 0; | |
656cffc9 | 3112 | if (session->state == ISCSI_STATE_IN_RECOVERY && |
67a61114 | 3113 | old_stop_stage != STOP_CONN_RECOVER) { |
1b2c7af8 | 3114 | ISCSI_DBG_SESSION(session, "blocking session\n"); |
75613521 | 3115 | iscsi_block_session(session->cls_session); |
67a61114 | 3116 | } |
7996a778 | 3117 | } |
656cffc9 | 3118 | |
656cffc9 MC |
3119 | /* |
3120 | * flush queues. | |
3121 | */ | |
3122 | spin_lock_bh(&session->lock); | |
b3cd5050 | 3123 | fail_scsi_tasks(conn, -1, DID_TRANSPORT_DISRUPTED); |
3bbaaad9 | 3124 | fail_mgmt_tasks(session, conn); |
5d12c05e | 3125 | memset(&conn->tmhdr, 0, sizeof(conn->tmhdr)); |
656cffc9 | 3126 | spin_unlock_bh(&session->lock); |
6724add1 | 3127 | mutex_unlock(&session->eh_mutex); |
7996a778 | 3128 | } |
7996a778 MC |
3129 | |
3130 | void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) | |
3131 | { | |
3132 | struct iscsi_conn *conn = cls_conn->dd_data; | |
3133 | struct iscsi_session *session = conn->session; | |
3134 | ||
3135 | switch (flag) { | |
3136 | case STOP_CONN_RECOVER: | |
3137 | case STOP_CONN_TERM: | |
3138 | iscsi_start_session_recovery(session, conn, flag); | |
8d2860b3 | 3139 | break; |
7996a778 | 3140 | default: |
322d739d MC |
3141 | iscsi_conn_printk(KERN_ERR, conn, |
3142 | "invalid stop flag %d\n", flag); | |
7996a778 MC |
3143 | } |
3144 | } | |
3145 | EXPORT_SYMBOL_GPL(iscsi_conn_stop); | |
3146 | ||
3147 | int iscsi_conn_bind(struct iscsi_cls_session *cls_session, | |
3148 | struct iscsi_cls_conn *cls_conn, int is_leading) | |
3149 | { | |
75613521 | 3150 | struct iscsi_session *session = cls_session->dd_data; |
98644047 | 3151 | struct iscsi_conn *conn = cls_conn->dd_data; |
7996a778 | 3152 | |
7996a778 | 3153 | spin_lock_bh(&session->lock); |
7996a778 MC |
3154 | if (is_leading) |
3155 | session->leadconn = conn; | |
98644047 | 3156 | spin_unlock_bh(&session->lock); |
7996a778 MC |
3157 | |
3158 | /* | |
3159 | * Unblock xmitworker(), Login Phase will pass through. | |
3160 | */ | |
3161 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
3162 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
3163 | return 0; | |
3164 | } | |
3165 | EXPORT_SYMBOL_GPL(iscsi_conn_bind); | |
3166 | ||
5700b1af MC |
3167 | static int iscsi_switch_str_param(char **param, char *new_val_buf) |
3168 | { | |
3169 | char *new_val; | |
3170 | ||
3171 | if (*param) { | |
3172 | if (!strcmp(*param, new_val_buf)) | |
3173 | return 0; | |
3174 | } | |
3175 | ||
3176 | new_val = kstrdup(new_val_buf, GFP_NOIO); | |
3177 | if (!new_val) | |
3178 | return -ENOMEM; | |
3179 | ||
3180 | kfree(*param); | |
3181 | *param = new_val; | |
3182 | return 0; | |
3183 | } | |
a54a52ca MC |
3184 | |
3185 | int iscsi_set_param(struct iscsi_cls_conn *cls_conn, | |
3186 | enum iscsi_param param, char *buf, int buflen) | |
3187 | { | |
3188 | struct iscsi_conn *conn = cls_conn->dd_data; | |
3189 | struct iscsi_session *session = conn->session; | |
3190 | uint32_t value; | |
3191 | ||
3192 | switch(param) { | |
843c0a8a MC |
3193 | case ISCSI_PARAM_FAST_ABORT: |
3194 | sscanf(buf, "%d", &session->fast_abort); | |
3195 | break; | |
f6d5180c MC |
3196 | case ISCSI_PARAM_ABORT_TMO: |
3197 | sscanf(buf, "%d", &session->abort_timeout); | |
3198 | break; | |
3199 | case ISCSI_PARAM_LU_RESET_TMO: | |
3200 | sscanf(buf, "%d", &session->lu_reset_timeout); | |
3201 | break; | |
3fe5ae8b MC |
3202 | case ISCSI_PARAM_TGT_RESET_TMO: |
3203 | sscanf(buf, "%d", &session->tgt_reset_timeout); | |
3204 | break; | |
f6d5180c MC |
3205 | case ISCSI_PARAM_PING_TMO: |
3206 | sscanf(buf, "%d", &conn->ping_timeout); | |
3207 | break; | |
3208 | case ISCSI_PARAM_RECV_TMO: | |
3209 | sscanf(buf, "%d", &conn->recv_timeout); | |
3210 | break; | |
a54a52ca MC |
3211 | case ISCSI_PARAM_MAX_RECV_DLENGTH: |
3212 | sscanf(buf, "%d", &conn->max_recv_dlength); | |
3213 | break; | |
3214 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
3215 | sscanf(buf, "%d", &conn->max_xmit_dlength); | |
3216 | break; | |
3217 | case ISCSI_PARAM_HDRDGST_EN: | |
3218 | sscanf(buf, "%d", &conn->hdrdgst_en); | |
3219 | break; | |
3220 | case ISCSI_PARAM_DATADGST_EN: | |
3221 | sscanf(buf, "%d", &conn->datadgst_en); | |
3222 | break; | |
3223 | case ISCSI_PARAM_INITIAL_R2T_EN: | |
3224 | sscanf(buf, "%d", &session->initial_r2t_en); | |
3225 | break; | |
3226 | case ISCSI_PARAM_MAX_R2T: | |
3227 | sscanf(buf, "%d", &session->max_r2t); | |
3228 | break; | |
3229 | case ISCSI_PARAM_IMM_DATA_EN: | |
3230 | sscanf(buf, "%d", &session->imm_data_en); | |
3231 | break; | |
3232 | case ISCSI_PARAM_FIRST_BURST: | |
3233 | sscanf(buf, "%d", &session->first_burst); | |
3234 | break; | |
3235 | case ISCSI_PARAM_MAX_BURST: | |
3236 | sscanf(buf, "%d", &session->max_burst); | |
3237 | break; | |
3238 | case ISCSI_PARAM_PDU_INORDER_EN: | |
3239 | sscanf(buf, "%d", &session->pdu_inorder_en); | |
3240 | break; | |
3241 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
3242 | sscanf(buf, "%d", &session->dataseq_inorder_en); | |
3243 | break; | |
3244 | case ISCSI_PARAM_ERL: | |
3245 | sscanf(buf, "%d", &session->erl); | |
3246 | break; | |
3247 | case ISCSI_PARAM_IFMARKER_EN: | |
3248 | sscanf(buf, "%d", &value); | |
3249 | BUG_ON(value); | |
3250 | break; | |
3251 | case ISCSI_PARAM_OFMARKER_EN: | |
3252 | sscanf(buf, "%d", &value); | |
3253 | BUG_ON(value); | |
3254 | break; | |
3255 | case ISCSI_PARAM_EXP_STATSN: | |
3256 | sscanf(buf, "%u", &conn->exp_statsn); | |
3257 | break; | |
b2c64167 | 3258 | case ISCSI_PARAM_USERNAME: |
5700b1af | 3259 | return iscsi_switch_str_param(&session->username, buf); |
b2c64167 | 3260 | case ISCSI_PARAM_USERNAME_IN: |
5700b1af | 3261 | return iscsi_switch_str_param(&session->username_in, buf); |
b2c64167 | 3262 | case ISCSI_PARAM_PASSWORD: |
5700b1af | 3263 | return iscsi_switch_str_param(&session->password, buf); |
b2c64167 | 3264 | case ISCSI_PARAM_PASSWORD_IN: |
5700b1af | 3265 | return iscsi_switch_str_param(&session->password_in, buf); |
a54a52ca | 3266 | case ISCSI_PARAM_TARGET_NAME: |
5700b1af | 3267 | return iscsi_switch_str_param(&session->targetname, buf); |
a54a52ca MC |
3268 | case ISCSI_PARAM_TPGT: |
3269 | sscanf(buf, "%d", &session->tpgt); | |
3270 | break; | |
3271 | case ISCSI_PARAM_PERSISTENT_PORT: | |
3272 | sscanf(buf, "%d", &conn->persistent_port); | |
3273 | break; | |
3274 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
5700b1af | 3275 | return iscsi_switch_str_param(&conn->persistent_address, buf); |
88dfd340 | 3276 | case ISCSI_PARAM_IFACE_NAME: |
5700b1af | 3277 | return iscsi_switch_str_param(&session->ifacename, buf); |
88dfd340 | 3278 | case ISCSI_PARAM_INITIATOR_NAME: |
5700b1af | 3279 | return iscsi_switch_str_param(&session->initiatorname, buf); |
a54a52ca MC |
3280 | default: |
3281 | return -ENOSYS; | |
3282 | } | |
3283 | ||
3284 | return 0; | |
3285 | } | |
3286 | EXPORT_SYMBOL_GPL(iscsi_set_param); | |
3287 | ||
3288 | int iscsi_session_get_param(struct iscsi_cls_session *cls_session, | |
3289 | enum iscsi_param param, char *buf) | |
3290 | { | |
75613521 | 3291 | struct iscsi_session *session = cls_session->dd_data; |
a54a52ca MC |
3292 | int len; |
3293 | ||
3294 | switch(param) { | |
843c0a8a MC |
3295 | case ISCSI_PARAM_FAST_ABORT: |
3296 | len = sprintf(buf, "%d\n", session->fast_abort); | |
3297 | break; | |
f6d5180c MC |
3298 | case ISCSI_PARAM_ABORT_TMO: |
3299 | len = sprintf(buf, "%d\n", session->abort_timeout); | |
3300 | break; | |
3301 | case ISCSI_PARAM_LU_RESET_TMO: | |
3302 | len = sprintf(buf, "%d\n", session->lu_reset_timeout); | |
3303 | break; | |
3fe5ae8b MC |
3304 | case ISCSI_PARAM_TGT_RESET_TMO: |
3305 | len = sprintf(buf, "%d\n", session->tgt_reset_timeout); | |
3306 | break; | |
a54a52ca MC |
3307 | case ISCSI_PARAM_INITIAL_R2T_EN: |
3308 | len = sprintf(buf, "%d\n", session->initial_r2t_en); | |
3309 | break; | |
3310 | case ISCSI_PARAM_MAX_R2T: | |
3311 | len = sprintf(buf, "%hu\n", session->max_r2t); | |
3312 | break; | |
3313 | case ISCSI_PARAM_IMM_DATA_EN: | |
3314 | len = sprintf(buf, "%d\n", session->imm_data_en); | |
3315 | break; | |
3316 | case ISCSI_PARAM_FIRST_BURST: | |
3317 | len = sprintf(buf, "%u\n", session->first_burst); | |
3318 | break; | |
3319 | case ISCSI_PARAM_MAX_BURST: | |
3320 | len = sprintf(buf, "%u\n", session->max_burst); | |
3321 | break; | |
3322 | case ISCSI_PARAM_PDU_INORDER_EN: | |
3323 | len = sprintf(buf, "%d\n", session->pdu_inorder_en); | |
3324 | break; | |
3325 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
3326 | len = sprintf(buf, "%d\n", session->dataseq_inorder_en); | |
3327 | break; | |
3328 | case ISCSI_PARAM_ERL: | |
3329 | len = sprintf(buf, "%d\n", session->erl); | |
3330 | break; | |
3331 | case ISCSI_PARAM_TARGET_NAME: | |
3332 | len = sprintf(buf, "%s\n", session->targetname); | |
3333 | break; | |
3334 | case ISCSI_PARAM_TPGT: | |
3335 | len = sprintf(buf, "%d\n", session->tpgt); | |
3336 | break; | |
b2c64167 MC |
3337 | case ISCSI_PARAM_USERNAME: |
3338 | len = sprintf(buf, "%s\n", session->username); | |
3339 | break; | |
3340 | case ISCSI_PARAM_USERNAME_IN: | |
3341 | len = sprintf(buf, "%s\n", session->username_in); | |
3342 | break; | |
3343 | case ISCSI_PARAM_PASSWORD: | |
3344 | len = sprintf(buf, "%s\n", session->password); | |
3345 | break; | |
3346 | case ISCSI_PARAM_PASSWORD_IN: | |
3347 | len = sprintf(buf, "%s\n", session->password_in); | |
3348 | break; | |
88dfd340 MC |
3349 | case ISCSI_PARAM_IFACE_NAME: |
3350 | len = sprintf(buf, "%s\n", session->ifacename); | |
3351 | break; | |
3352 | case ISCSI_PARAM_INITIATOR_NAME: | |
5700b1af | 3353 | len = sprintf(buf, "%s\n", session->initiatorname); |
88dfd340 | 3354 | break; |
a54a52ca MC |
3355 | default: |
3356 | return -ENOSYS; | |
3357 | } | |
3358 | ||
3359 | return len; | |
3360 | } | |
3361 | EXPORT_SYMBOL_GPL(iscsi_session_get_param); | |
3362 | ||
3363 | int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn, | |
3364 | enum iscsi_param param, char *buf) | |
3365 | { | |
3366 | struct iscsi_conn *conn = cls_conn->dd_data; | |
3367 | int len; | |
3368 | ||
3369 | switch(param) { | |
f6d5180c MC |
3370 | case ISCSI_PARAM_PING_TMO: |
3371 | len = sprintf(buf, "%u\n", conn->ping_timeout); | |
3372 | break; | |
3373 | case ISCSI_PARAM_RECV_TMO: | |
3374 | len = sprintf(buf, "%u\n", conn->recv_timeout); | |
3375 | break; | |
a54a52ca MC |
3376 | case ISCSI_PARAM_MAX_RECV_DLENGTH: |
3377 | len = sprintf(buf, "%u\n", conn->max_recv_dlength); | |
3378 | break; | |
3379 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
3380 | len = sprintf(buf, "%u\n", conn->max_xmit_dlength); | |
3381 | break; | |
3382 | case ISCSI_PARAM_HDRDGST_EN: | |
3383 | len = sprintf(buf, "%d\n", conn->hdrdgst_en); | |
3384 | break; | |
3385 | case ISCSI_PARAM_DATADGST_EN: | |
3386 | len = sprintf(buf, "%d\n", conn->datadgst_en); | |
3387 | break; | |
3388 | case ISCSI_PARAM_IFMARKER_EN: | |
3389 | len = sprintf(buf, "%d\n", conn->ifmarker_en); | |
3390 | break; | |
3391 | case ISCSI_PARAM_OFMARKER_EN: | |
3392 | len = sprintf(buf, "%d\n", conn->ofmarker_en); | |
3393 | break; | |
3394 | case ISCSI_PARAM_EXP_STATSN: | |
3395 | len = sprintf(buf, "%u\n", conn->exp_statsn); | |
3396 | break; | |
3397 | case ISCSI_PARAM_PERSISTENT_PORT: | |
3398 | len = sprintf(buf, "%d\n", conn->persistent_port); | |
3399 | break; | |
3400 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
3401 | len = sprintf(buf, "%s\n", conn->persistent_address); | |
3402 | break; | |
3403 | default: | |
3404 | return -ENOSYS; | |
3405 | } | |
3406 | ||
3407 | return len; | |
3408 | } | |
3409 | EXPORT_SYMBOL_GPL(iscsi_conn_get_param); | |
3410 | ||
0801c242 MC |
3411 | int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param, |
3412 | char *buf) | |
3413 | { | |
75613521 | 3414 | struct iscsi_host *ihost = shost_priv(shost); |
0801c242 MC |
3415 | int len; |
3416 | ||
3417 | switch (param) { | |
d8196ed2 | 3418 | case ISCSI_HOST_PARAM_NETDEV_NAME: |
5700b1af | 3419 | len = sprintf(buf, "%s\n", ihost->netdev); |
d8196ed2 | 3420 | break; |
0801c242 | 3421 | case ISCSI_HOST_PARAM_HWADDRESS: |
5700b1af | 3422 | len = sprintf(buf, "%s\n", ihost->hwaddress); |
0801c242 | 3423 | break; |
8ad5781a | 3424 | case ISCSI_HOST_PARAM_INITIATOR_NAME: |
5700b1af | 3425 | len = sprintf(buf, "%s\n", ihost->initiatorname); |
8ad5781a | 3426 | break; |
75613521 | 3427 | case ISCSI_HOST_PARAM_IPADDRESS: |
5700b1af | 3428 | len = sprintf(buf, "%s\n", ihost->local_address); |
88dfd340 | 3429 | break; |
0801c242 MC |
3430 | default: |
3431 | return -ENOSYS; | |
3432 | } | |
3433 | ||
3434 | return len; | |
3435 | } | |
3436 | EXPORT_SYMBOL_GPL(iscsi_host_get_param); | |
3437 | ||
3438 | int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param, | |
3439 | char *buf, int buflen) | |
3440 | { | |
75613521 | 3441 | struct iscsi_host *ihost = shost_priv(shost); |
0801c242 MC |
3442 | |
3443 | switch (param) { | |
d8196ed2 | 3444 | case ISCSI_HOST_PARAM_NETDEV_NAME: |
5700b1af | 3445 | return iscsi_switch_str_param(&ihost->netdev, buf); |
0801c242 | 3446 | case ISCSI_HOST_PARAM_HWADDRESS: |
5700b1af | 3447 | return iscsi_switch_str_param(&ihost->hwaddress, buf); |
8ad5781a | 3448 | case ISCSI_HOST_PARAM_INITIATOR_NAME: |
5700b1af | 3449 | return iscsi_switch_str_param(&ihost->initiatorname, buf); |
0801c242 MC |
3450 | default: |
3451 | return -ENOSYS; | |
3452 | } | |
3453 | ||
3454 | return 0; | |
3455 | } | |
3456 | EXPORT_SYMBOL_GPL(iscsi_host_set_param); | |
3457 | ||
7996a778 MC |
3458 | MODULE_AUTHOR("Mike Christie"); |
3459 | MODULE_DESCRIPTION("iSCSI library functions"); | |
3460 | MODULE_LICENSE("GPL"); |