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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; | |
96b1f96d | 474 | hdr->cmdsn = task->cmdsn = cpu_to_be32(session->cmdsn); |
004d6530 | 475 | |
577577da | 476 | if (session->tt->init_task && session->tt->init_task(task)) |
052d0144 MC |
477 | return -EIO; |
478 | ||
9c19a7d0 | 479 | task->state = ISCSI_TASK_RUNNING; |
d3305f34 | 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; |
f41d4721 | 508 | int oldstate = task->state; |
7996a778 | 509 | |
4421c9eb MC |
510 | ISCSI_DBG_SESSION(session, "freeing task itt 0x%x state %d sc %p\n", |
511 | task->itt, task->state, task->sc); | |
512 | ||
577577da | 513 | session->tt->cleanup_task(task); |
3bbaaad9 | 514 | task->state = ISCSI_TASK_FREE; |
9c19a7d0 | 515 | task->sc = NULL; |
3e5c28ad | 516 | /* |
9c19a7d0 | 517 | * login task is preallocated so do not free |
3e5c28ad | 518 | */ |
9c19a7d0 | 519 | if (conn->login_task == task) |
3e5c28ad MC |
520 | return; |
521 | ||
7acd72eb | 522 | kfifo_in(&session->cmdpool.queue, (void*)&task, sizeof(void*)); |
052d0144 | 523 | |
3e5c28ad | 524 | if (sc) { |
9c19a7d0 | 525 | task->sc = NULL; |
3e5c28ad MC |
526 | /* SCSI eh reuses commands to verify us */ |
527 | sc->SCp.ptr = NULL; | |
528 | /* | |
f41d4721 MC |
529 | * queue command may call this to free the task, so |
530 | * it will decide how to return sc to scsi-ml. | |
3e5c28ad | 531 | */ |
f41d4721 | 532 | if (oldstate != ISCSI_TASK_REQUEUE_SCSIQ) |
3e5c28ad MC |
533 | sc->scsi_done(sc); |
534 | } | |
7996a778 MC |
535 | } |
536 | ||
913e5bf4 | 537 | void __iscsi_get_task(struct iscsi_task *task) |
60ecebf5 | 538 | { |
9c19a7d0 | 539 | atomic_inc(&task->refcount); |
60ecebf5 | 540 | } |
913e5bf4 | 541 | EXPORT_SYMBOL_GPL(__iscsi_get_task); |
60ecebf5 | 542 | |
8eea2f55 | 543 | void __iscsi_put_task(struct iscsi_task *task) |
60ecebf5 | 544 | { |
9c19a7d0 | 545 | if (atomic_dec_and_test(&task->refcount)) |
3bbaaad9 | 546 | iscsi_free_task(task); |
60ecebf5 | 547 | } |
8eea2f55 | 548 | EXPORT_SYMBOL_GPL(__iscsi_put_task); |
60ecebf5 | 549 | |
9c19a7d0 | 550 | void iscsi_put_task(struct iscsi_task *task) |
3e5c28ad | 551 | { |
9c19a7d0 | 552 | struct iscsi_session *session = task->conn->session; |
3e5c28ad MC |
553 | |
554 | spin_lock_bh(&session->lock); | |
9c19a7d0 | 555 | __iscsi_put_task(task); |
3e5c28ad MC |
556 | spin_unlock_bh(&session->lock); |
557 | } | |
9c19a7d0 | 558 | EXPORT_SYMBOL_GPL(iscsi_put_task); |
3e5c28ad | 559 | |
3bbaaad9 MC |
560 | /** |
561 | * iscsi_complete_task - finish a task | |
562 | * @task: iscsi cmd task | |
b3cd5050 | 563 | * @state: state to complete task with |
3bbaaad9 MC |
564 | * |
565 | * Must be called with session lock. | |
566 | */ | |
b3cd5050 | 567 | static void iscsi_complete_task(struct iscsi_task *task, int state) |
3bbaaad9 MC |
568 | { |
569 | struct iscsi_conn *conn = task->conn; | |
570 | ||
4421c9eb MC |
571 | ISCSI_DBG_SESSION(conn->session, |
572 | "complete task itt 0x%x state %d sc %p\n", | |
573 | task->itt, task->state, task->sc); | |
b3cd5050 MC |
574 | if (task->state == ISCSI_TASK_COMPLETED || |
575 | task->state == ISCSI_TASK_ABRT_TMF || | |
f41d4721 MC |
576 | task->state == ISCSI_TASK_ABRT_SESS_RECOV || |
577 | task->state == ISCSI_TASK_REQUEUE_SCSIQ) | |
3bbaaad9 MC |
578 | return; |
579 | WARN_ON_ONCE(task->state == ISCSI_TASK_FREE); | |
b3cd5050 | 580 | task->state = state; |
3bbaaad9 MC |
581 | |
582 | if (!list_empty(&task->running)) | |
583 | list_del_init(&task->running); | |
584 | ||
585 | if (conn->task == task) | |
586 | conn->task = NULL; | |
587 | ||
588 | if (conn->ping_task == task) | |
589 | conn->ping_task = NULL; | |
590 | ||
591 | /* release get from queueing */ | |
592 | __iscsi_put_task(task); | |
593 | } | |
594 | ||
4c0ba5d2 MC |
595 | /** |
596 | * iscsi_complete_scsi_task - finish scsi task normally | |
597 | * @task: iscsi task for scsi cmd | |
598 | * @exp_cmdsn: expected cmd sn in cpu format | |
599 | * @max_cmdsn: max cmd sn in cpu format | |
600 | * | |
601 | * This is used when drivers do not need or cannot perform | |
602 | * lower level pdu processing. | |
603 | * | |
604 | * Called with session lock | |
605 | */ | |
606 | void iscsi_complete_scsi_task(struct iscsi_task *task, | |
607 | uint32_t exp_cmdsn, uint32_t max_cmdsn) | |
608 | { | |
609 | struct iscsi_conn *conn = task->conn; | |
610 | ||
611 | ISCSI_DBG_SESSION(conn->session, "[itt 0x%x]\n", task->itt); | |
612 | ||
613 | conn->last_recv = jiffies; | |
614 | __iscsi_update_cmdsn(conn->session, exp_cmdsn, max_cmdsn); | |
615 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); | |
616 | } | |
617 | EXPORT_SYMBOL_GPL(iscsi_complete_scsi_task); | |
618 | ||
619 | ||
b3a7ea8d | 620 | /* |
3bbaaad9 MC |
621 | * session lock must be held and if not called for a task that is |
622 | * still pending or from the xmit thread, then xmit thread must | |
623 | * be suspended. | |
b3a7ea8d | 624 | */ |
3bbaaad9 | 625 | static void fail_scsi_task(struct iscsi_task *task, int err) |
b3a7ea8d | 626 | { |
3bbaaad9 | 627 | struct iscsi_conn *conn = task->conn; |
b3a7ea8d | 628 | struct scsi_cmnd *sc; |
b3cd5050 | 629 | int state; |
b3a7ea8d | 630 | |
3bbaaad9 MC |
631 | /* |
632 | * if a command completes and we get a successful tmf response | |
633 | * we will hit this because the scsi eh abort code does not take | |
634 | * a ref to the task. | |
635 | */ | |
9c19a7d0 | 636 | sc = task->sc; |
b3a7ea8d MC |
637 | if (!sc) |
638 | return; | |
639 | ||
b3cd5050 | 640 | if (task->state == ISCSI_TASK_PENDING) { |
b3a7ea8d MC |
641 | /* |
642 | * cmd never made it to the xmit thread, so we should not count | |
643 | * the cmd in the sequencing | |
644 | */ | |
645 | conn->session->queued_cmdsn--; | |
b3cd5050 MC |
646 | /* it was never sent so just complete like normal */ |
647 | state = ISCSI_TASK_COMPLETED; | |
648 | } else if (err == DID_TRANSPORT_DISRUPTED) | |
649 | state = ISCSI_TASK_ABRT_SESS_RECOV; | |
650 | else | |
651 | state = ISCSI_TASK_ABRT_TMF; | |
b3a7ea8d | 652 | |
b3cd5050 | 653 | sc->result = err << 16; |
c07d4444 BH |
654 | if (!scsi_bidi_cmnd(sc)) |
655 | scsi_set_resid(sc, scsi_bufflen(sc)); | |
656 | else { | |
657 | scsi_out(sc)->resid = scsi_out(sc)->length; | |
658 | scsi_in(sc)->resid = scsi_in(sc)->length; | |
659 | } | |
3e5c28ad | 660 | |
b3cd5050 | 661 | iscsi_complete_task(task, state); |
b3a7ea8d MC |
662 | } |
663 | ||
3e5c28ad | 664 | static int iscsi_prep_mgmt_task(struct iscsi_conn *conn, |
9c19a7d0 | 665 | struct iscsi_task *task) |
052d0144 MC |
666 | { |
667 | struct iscsi_session *session = conn->session; | |
577577da | 668 | struct iscsi_hdr *hdr = task->hdr; |
052d0144 | 669 | struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr; |
4f704dc0 | 670 | uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK; |
052d0144 MC |
671 | |
672 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) | |
673 | return -ENOTCONN; | |
674 | ||
4f704dc0 | 675 | if (opcode != ISCSI_OP_LOGIN && opcode != ISCSI_OP_TEXT) |
052d0144 MC |
676 | nop->exp_statsn = cpu_to_be32(conn->exp_statsn); |
677 | /* | |
678 | * pre-format CmdSN for outgoing PDU. | |
679 | */ | |
680 | nop->cmdsn = cpu_to_be32(session->cmdsn); | |
681 | if (hdr->itt != RESERVED_ITT) { | |
052d0144 | 682 | /* |
4f704dc0 | 683 | * TODO: We always use immediate for normal session pdus. |
052d0144 MC |
684 | * If we start to send tmfs or nops as non-immediate then |
685 | * we should start checking the cmdsn numbers for mgmt tasks. | |
4f704dc0 MC |
686 | * |
687 | * During discovery sessions iscsid sends TEXT as non immediate, | |
688 | * but we always only send one PDU at a time. | |
052d0144 MC |
689 | */ |
690 | if (conn->c_stage == ISCSI_CONN_STARTED && | |
691 | !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { | |
692 | session->queued_cmdsn++; | |
693 | session->cmdsn++; | |
694 | } | |
695 | } | |
696 | ||
ae15f801 MC |
697 | if (session->tt->init_task && session->tt->init_task(task)) |
698 | return -EIO; | |
052d0144 MC |
699 | |
700 | if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT) | |
701 | session->state = ISCSI_STATE_LOGGING_OUT; | |
702 | ||
577577da | 703 | task->state = ISCSI_TASK_RUNNING; |
1b2c7af8 MC |
704 | ISCSI_DBG_SESSION(session, "mgmtpdu [op 0x%x hdr->itt 0x%x " |
705 | "datalen %d]\n", hdr->opcode & ISCSI_OPCODE_MASK, | |
706 | hdr->itt, task->data_count); | |
052d0144 MC |
707 | return 0; |
708 | } | |
709 | ||
9c19a7d0 | 710 | static struct iscsi_task * |
f6d5180c MC |
711 | __iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
712 | char *data, uint32_t data_size) | |
713 | { | |
714 | struct iscsi_session *session = conn->session; | |
1336aed1 | 715 | struct iscsi_host *ihost = shost_priv(session->host); |
4f704dc0 | 716 | uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK; |
9c19a7d0 | 717 | struct iscsi_task *task; |
262ef636 | 718 | itt_t itt; |
f6d5180c MC |
719 | |
720 | if (session->state == ISCSI_STATE_TERMINATE) | |
721 | return NULL; | |
722 | ||
4f704dc0 | 723 | if (opcode == ISCSI_OP_LOGIN || opcode == ISCSI_OP_TEXT) { |
f6d5180c MC |
724 | /* |
725 | * Login and Text are sent serially, in | |
726 | * request-followed-by-response sequence. | |
3e5c28ad MC |
727 | * Same task can be used. Same ITT must be used. |
728 | * Note that login_task is preallocated at conn_create(). | |
f6d5180c | 729 | */ |
4f704dc0 MC |
730 | if (conn->login_task->state != ISCSI_TASK_FREE) { |
731 | iscsi_conn_printk(KERN_ERR, conn, "Login/Text in " | |
732 | "progress. Cannot start new task.\n"); | |
733 | return NULL; | |
734 | } | |
735 | ||
9c19a7d0 | 736 | task = conn->login_task; |
4f704dc0 | 737 | } else { |
26013ad4 MC |
738 | if (session->state != ISCSI_STATE_LOGGED_IN) |
739 | return NULL; | |
740 | ||
f6d5180c MC |
741 | BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE); |
742 | BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED); | |
743 | ||
7acd72eb | 744 | if (!kfifo_out(&session->cmdpool.queue, |
9c19a7d0 | 745 | (void*)&task, sizeof(void*))) |
f6d5180c MC |
746 | return NULL; |
747 | } | |
3e5c28ad MC |
748 | /* |
749 | * released in complete pdu for task we expect a response for, and | |
750 | * released by the lld when it has transmitted the task for | |
751 | * pdus we do not expect a response for. | |
752 | */ | |
9c19a7d0 MC |
753 | atomic_set(&task->refcount, 1); |
754 | task->conn = conn; | |
755 | task->sc = NULL; | |
3bbaaad9 MC |
756 | INIT_LIST_HEAD(&task->running); |
757 | task->state = ISCSI_TASK_PENDING; | |
f6d5180c MC |
758 | |
759 | if (data_size) { | |
9c19a7d0 MC |
760 | memcpy(task->data, data, data_size); |
761 | task->data_count = data_size; | |
f6d5180c | 762 | } else |
9c19a7d0 | 763 | task->data_count = 0; |
f6d5180c | 764 | |
184b57c6 MC |
765 | if (conn->session->tt->alloc_pdu) { |
766 | if (conn->session->tt->alloc_pdu(task, hdr->opcode)) { | |
767 | iscsi_conn_printk(KERN_ERR, conn, "Could not allocate " | |
768 | "pdu for mgmt task.\n"); | |
3bbaaad9 | 769 | goto free_task; |
184b57c6 | 770 | } |
577577da | 771 | } |
184b57c6 | 772 | |
262ef636 | 773 | itt = task->hdr->itt; |
577577da | 774 | task->hdr_len = sizeof(struct iscsi_hdr); |
9c19a7d0 | 775 | memcpy(task->hdr, hdr, sizeof(struct iscsi_hdr)); |
262ef636 MC |
776 | |
777 | if (hdr->itt != RESERVED_ITT) { | |
778 | if (session->tt->parse_pdu_itt) | |
779 | task->hdr->itt = itt; | |
780 | else | |
781 | task->hdr->itt = build_itt(task->itt, | |
782 | task->conn->session->age); | |
783 | } | |
784 | ||
1336aed1 | 785 | if (!ihost->workq) { |
577577da MC |
786 | if (iscsi_prep_mgmt_task(conn, task)) |
787 | goto free_task; | |
052d0144 | 788 | |
9c19a7d0 | 789 | if (session->tt->xmit_task(task)) |
577577da | 790 | goto free_task; |
3bbaaad9 MC |
791 | } else { |
792 | list_add_tail(&task->running, &conn->mgmtqueue); | |
32ae763e | 793 | iscsi_conn_queue_work(conn); |
3bbaaad9 | 794 | } |
052d0144 | 795 | |
9c19a7d0 | 796 | return task; |
577577da MC |
797 | |
798 | free_task: | |
799 | __iscsi_put_task(task); | |
800 | return NULL; | |
f6d5180c MC |
801 | } |
802 | ||
803 | int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr, | |
804 | char *data, uint32_t data_size) | |
805 | { | |
806 | struct iscsi_conn *conn = cls_conn->dd_data; | |
807 | struct iscsi_session *session = conn->session; | |
808 | int err = 0; | |
809 | ||
810 | spin_lock_bh(&session->lock); | |
811 | if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size)) | |
812 | err = -EPERM; | |
813 | spin_unlock_bh(&session->lock); | |
f6d5180c MC |
814 | return err; |
815 | } | |
816 | EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu); | |
817 | ||
7996a778 MC |
818 | /** |
819 | * iscsi_cmd_rsp - SCSI Command Response processing | |
820 | * @conn: iscsi connection | |
821 | * @hdr: iscsi header | |
9c19a7d0 | 822 | * @task: scsi command task |
7996a778 MC |
823 | * @data: cmd data buffer |
824 | * @datalen: len of buffer | |
825 | * | |
826 | * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and | |
9c19a7d0 | 827 | * then completes the command and task. |
7996a778 | 828 | **/ |
77a23c21 | 829 | static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
9c19a7d0 | 830 | struct iscsi_task *task, char *data, |
77a23c21 | 831 | int datalen) |
7996a778 | 832 | { |
7996a778 MC |
833 | struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)hdr; |
834 | struct iscsi_session *session = conn->session; | |
9c19a7d0 | 835 | struct scsi_cmnd *sc = task->sc; |
7996a778 | 836 | |
77a23c21 | 837 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr); |
7996a778 MC |
838 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; |
839 | ||
840 | sc->result = (DID_OK << 16) | rhdr->cmd_status; | |
841 | ||
842 | if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) { | |
843 | sc->result = DID_ERROR << 16; | |
844 | goto out; | |
845 | } | |
846 | ||
847 | if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) { | |
9b80cb4b | 848 | uint16_t senselen; |
7996a778 MC |
849 | |
850 | if (datalen < 2) { | |
851 | invalid_datalen: | |
322d739d MC |
852 | iscsi_conn_printk(KERN_ERR, conn, |
853 | "Got CHECK_CONDITION but invalid data " | |
854 | "buffer size of %d\n", datalen); | |
7996a778 MC |
855 | sc->result = DID_BAD_TARGET << 16; |
856 | goto out; | |
857 | } | |
858 | ||
8f333991 | 859 | senselen = get_unaligned_be16(data); |
7996a778 MC |
860 | if (datalen < senselen) |
861 | goto invalid_datalen; | |
862 | ||
863 | memcpy(sc->sense_buffer, data + 2, | |
9b80cb4b | 864 | min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE)); |
1b2c7af8 MC |
865 | ISCSI_DBG_SESSION(session, "copied %d bytes of sense\n", |
866 | min_t(uint16_t, senselen, | |
867 | SCSI_SENSE_BUFFERSIZE)); | |
7996a778 MC |
868 | } |
869 | ||
c07d4444 BH |
870 | if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW | |
871 | ISCSI_FLAG_CMD_BIDI_OVERFLOW)) { | |
872 | int res_count = be32_to_cpu(rhdr->bi_residual_count); | |
873 | ||
874 | if (scsi_bidi_cmnd(sc) && res_count > 0 && | |
875 | (rhdr->flags & ISCSI_FLAG_CMD_BIDI_OVERFLOW || | |
876 | res_count <= scsi_in(sc)->length)) | |
877 | scsi_in(sc)->resid = res_count; | |
878 | else | |
879 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
880 | } | |
881 | ||
7207fea4 BH |
882 | if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW | |
883 | ISCSI_FLAG_CMD_OVERFLOW)) { | |
7996a778 MC |
884 | int res_count = be32_to_cpu(rhdr->residual_count); |
885 | ||
7207fea4 BH |
886 | if (res_count > 0 && |
887 | (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || | |
888 | res_count <= scsi_bufflen(sc))) | |
c07d4444 | 889 | /* write side for bidi or uni-io set_resid */ |
1c138991 | 890 | scsi_set_resid(sc, res_count); |
7996a778 MC |
891 | else |
892 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
c07d4444 | 893 | } |
7996a778 | 894 | out: |
3bbaaad9 | 895 | ISCSI_DBG_SESSION(session, "cmd rsp done [sc %p res %d itt 0x%x]\n", |
1b2c7af8 | 896 | sc, sc->result, task->itt); |
7996a778 | 897 | conn->scsirsp_pdus_cnt++; |
b3cd5050 | 898 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); |
7996a778 MC |
899 | } |
900 | ||
1d9edf02 MC |
901 | /** |
902 | * iscsi_data_in_rsp - SCSI Data-In Response processing | |
903 | * @conn: iscsi connection | |
904 | * @hdr: iscsi pdu | |
905 | * @task: scsi command task | |
906 | **/ | |
907 | static void | |
908 | iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
909 | struct iscsi_task *task) | |
910 | { | |
911 | struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)hdr; | |
912 | struct scsi_cmnd *sc = task->sc; | |
913 | ||
914 | if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS)) | |
915 | return; | |
916 | ||
edbc9aa0 | 917 | iscsi_update_cmdsn(conn->session, (struct iscsi_nopin *)hdr); |
1d9edf02 MC |
918 | sc->result = (DID_OK << 16) | rhdr->cmd_status; |
919 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; | |
920 | if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW | | |
921 | ISCSI_FLAG_DATA_OVERFLOW)) { | |
922 | int res_count = be32_to_cpu(rhdr->residual_count); | |
923 | ||
924 | if (res_count > 0 && | |
925 | (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || | |
926 | res_count <= scsi_in(sc)->length)) | |
927 | scsi_in(sc)->resid = res_count; | |
928 | else | |
929 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
930 | } | |
931 | ||
3bbaaad9 MC |
932 | ISCSI_DBG_SESSION(conn->session, "data in with status done " |
933 | "[sc %p res %d itt 0x%x]\n", | |
934 | sc, sc->result, task->itt); | |
1d9edf02 | 935 | conn->scsirsp_pdus_cnt++; |
b3cd5050 | 936 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); |
1d9edf02 MC |
937 | } |
938 | ||
7ea8b828 MC |
939 | static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr) |
940 | { | |
941 | struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr; | |
942 | ||
943 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
944 | conn->tmfrsp_pdus_cnt++; | |
945 | ||
843c0a8a | 946 | if (conn->tmf_state != TMF_QUEUED) |
7ea8b828 MC |
947 | return; |
948 | ||
949 | if (tmf->response == ISCSI_TMF_RSP_COMPLETE) | |
843c0a8a | 950 | conn->tmf_state = TMF_SUCCESS; |
7ea8b828 | 951 | else if (tmf->response == ISCSI_TMF_RSP_NO_TASK) |
843c0a8a | 952 | conn->tmf_state = TMF_NOT_FOUND; |
7ea8b828 | 953 | else |
843c0a8a | 954 | conn->tmf_state = TMF_FAILED; |
7ea8b828 MC |
955 | wake_up(&conn->ehwait); |
956 | } | |
957 | ||
f6d5180c MC |
958 | static void iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr) |
959 | { | |
960 | struct iscsi_nopout hdr; | |
9c19a7d0 | 961 | struct iscsi_task *task; |
f6d5180c | 962 | |
9c19a7d0 | 963 | if (!rhdr && conn->ping_task) |
f6d5180c MC |
964 | return; |
965 | ||
966 | memset(&hdr, 0, sizeof(struct iscsi_nopout)); | |
967 | hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE; | |
968 | hdr.flags = ISCSI_FLAG_CMD_FINAL; | |
969 | ||
970 | if (rhdr) { | |
971 | memcpy(hdr.lun, rhdr->lun, 8); | |
972 | hdr.ttt = rhdr->ttt; | |
973 | hdr.itt = RESERVED_ITT; | |
974 | } else | |
975 | hdr.ttt = RESERVED_ITT; | |
976 | ||
9c19a7d0 MC |
977 | task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0); |
978 | if (!task) | |
322d739d | 979 | iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n"); |
d3acf022 MC |
980 | else if (!rhdr) { |
981 | /* only track our nops */ | |
982 | conn->ping_task = task; | |
983 | conn->last_ping = jiffies; | |
984 | } | |
f6d5180c MC |
985 | } |
986 | ||
8afa1439 MC |
987 | static int iscsi_nop_out_rsp(struct iscsi_task *task, |
988 | struct iscsi_nopin *nop, char *data, int datalen) | |
989 | { | |
990 | struct iscsi_conn *conn = task->conn; | |
991 | int rc = 0; | |
992 | ||
993 | if (conn->ping_task != task) { | |
994 | /* | |
995 | * If this is not in response to one of our | |
996 | * nops then it must be from userspace. | |
997 | */ | |
998 | if (iscsi_recv_pdu(conn->cls_conn, (struct iscsi_hdr *)nop, | |
999 | data, datalen)) | |
1000 | rc = ISCSI_ERR_CONN_FAILED; | |
1001 | } else | |
1002 | mod_timer(&conn->transport_timer, jiffies + conn->recv_timeout); | |
1003 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); | |
1004 | return rc; | |
1005 | } | |
1006 | ||
62f38300 MC |
1007 | static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
1008 | char *data, int datalen) | |
1009 | { | |
1010 | struct iscsi_reject *reject = (struct iscsi_reject *)hdr; | |
1011 | struct iscsi_hdr rejected_pdu; | |
8afa1439 | 1012 | int opcode, rc = 0; |
62f38300 MC |
1013 | |
1014 | conn->exp_statsn = be32_to_cpu(reject->statsn) + 1; | |
1015 | ||
8afa1439 MC |
1016 | if (ntoh24(reject->dlength) > datalen || |
1017 | ntoh24(reject->dlength) < sizeof(struct iscsi_hdr)) { | |
1018 | iscsi_conn_printk(KERN_ERR, conn, "Cannot handle rejected " | |
1019 | "pdu. Invalid data length (pdu dlength " | |
1020 | "%u, datalen %d\n", ntoh24(reject->dlength), | |
1021 | datalen); | |
1022 | return ISCSI_ERR_PROTO; | |
1023 | } | |
1024 | memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr)); | |
1025 | opcode = rejected_pdu.opcode & ISCSI_OPCODE_MASK; | |
1026 | ||
1027 | switch (reject->reason) { | |
1028 | case ISCSI_REASON_DATA_DIGEST_ERROR: | |
1029 | iscsi_conn_printk(KERN_ERR, conn, | |
1030 | "pdu (op 0x%x itt 0x%x) rejected " | |
1031 | "due to DataDigest error.\n", | |
1032 | rejected_pdu.itt, opcode); | |
1033 | break; | |
1034 | case ISCSI_REASON_IMM_CMD_REJECT: | |
1035 | iscsi_conn_printk(KERN_ERR, conn, | |
1036 | "pdu (op 0x%x itt 0x%x) rejected. Too many " | |
1037 | "immediate commands.\n", | |
1038 | rejected_pdu.itt, opcode); | |
1039 | /* | |
1040 | * We only send one TMF at a time so if the target could not | |
1041 | * handle it, then it should get fixed (RFC mandates that | |
1042 | * a target can handle one immediate TMF per conn). | |
1043 | * | |
1044 | * For nops-outs, we could have sent more than one if | |
1045 | * the target is sending us lots of nop-ins | |
1046 | */ | |
1047 | if (opcode != ISCSI_OP_NOOP_OUT) | |
1048 | return 0; | |
62f38300 | 1049 | |
8afa1439 MC |
1050 | if (rejected_pdu.itt == cpu_to_be32(ISCSI_RESERVED_TAG)) |
1051 | /* | |
1052 | * nop-out in response to target's nop-out rejected. | |
1053 | * Just resend. | |
1054 | */ | |
1055 | iscsi_send_nopout(conn, | |
1056 | (struct iscsi_nopin*)&rejected_pdu); | |
1057 | else { | |
1058 | struct iscsi_task *task; | |
1059 | /* | |
1060 | * Our nop as ping got dropped. We know the target | |
1061 | * and transport are ok so just clean up | |
1062 | */ | |
1063 | task = iscsi_itt_to_task(conn, rejected_pdu.itt); | |
1064 | if (!task) { | |
1065 | iscsi_conn_printk(KERN_ERR, conn, | |
1066 | "Invalid pdu reject. Could " | |
1067 | "not lookup rejected task.\n"); | |
1068 | rc = ISCSI_ERR_BAD_ITT; | |
1069 | } else | |
1070 | rc = iscsi_nop_out_rsp(task, | |
1071 | (struct iscsi_nopin*)&rejected_pdu, | |
1072 | NULL, 0); | |
62f38300 | 1073 | } |
8afa1439 MC |
1074 | break; |
1075 | default: | |
1076 | iscsi_conn_printk(KERN_ERR, conn, | |
1077 | "pdu (op 0x%x itt 0x%x) rejected. Reason " | |
1078 | "code 0x%x\n", rejected_pdu.itt, | |
1079 | rejected_pdu.opcode, reject->reason); | |
1080 | break; | |
62f38300 | 1081 | } |
8afa1439 | 1082 | return rc; |
62f38300 MC |
1083 | } |
1084 | ||
913e5bf4 MC |
1085 | /** |
1086 | * iscsi_itt_to_task - look up task by itt | |
1087 | * @conn: iscsi connection | |
1088 | * @itt: itt | |
1089 | * | |
1090 | * This should be used for mgmt tasks like login and nops, or if | |
1091 | * the LDD's itt space does not include the session age. | |
1092 | * | |
1093 | * The session lock must be held. | |
1094 | */ | |
8f9256ce | 1095 | struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *conn, itt_t itt) |
913e5bf4 MC |
1096 | { |
1097 | struct iscsi_session *session = conn->session; | |
262ef636 | 1098 | int i; |
913e5bf4 MC |
1099 | |
1100 | if (itt == RESERVED_ITT) | |
1101 | return NULL; | |
1102 | ||
262ef636 MC |
1103 | if (session->tt->parse_pdu_itt) |
1104 | session->tt->parse_pdu_itt(conn, itt, &i, NULL); | |
1105 | else | |
1106 | i = get_itt(itt); | |
913e5bf4 MC |
1107 | if (i >= session->cmds_max) |
1108 | return NULL; | |
1109 | ||
1110 | return session->cmds[i]; | |
1111 | } | |
8f9256ce | 1112 | EXPORT_SYMBOL_GPL(iscsi_itt_to_task); |
913e5bf4 | 1113 | |
7996a778 MC |
1114 | /** |
1115 | * __iscsi_complete_pdu - complete pdu | |
1116 | * @conn: iscsi conn | |
1117 | * @hdr: iscsi header | |
1118 | * @data: data buffer | |
1119 | * @datalen: len of data buffer | |
1120 | * | |
1121 | * Completes pdu processing by freeing any resources allocated at | |
1122 | * queuecommand or send generic. session lock must be held and verify | |
1123 | * itt must have been called. | |
1124 | */ | |
913e5bf4 MC |
1125 | int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
1126 | char *data, int datalen) | |
7996a778 MC |
1127 | { |
1128 | struct iscsi_session *session = conn->session; | |
1129 | int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0; | |
9c19a7d0 | 1130 | struct iscsi_task *task; |
7996a778 MC |
1131 | uint32_t itt; |
1132 | ||
f6d5180c | 1133 | conn->last_recv = jiffies; |
0af967f5 MC |
1134 | rc = iscsi_verify_itt(conn, hdr->itt); |
1135 | if (rc) | |
1136 | return rc; | |
1137 | ||
b4377356 AV |
1138 | if (hdr->itt != RESERVED_ITT) |
1139 | itt = get_itt(hdr->itt); | |
7996a778 | 1140 | else |
b4377356 | 1141 | itt = ~0U; |
7996a778 | 1142 | |
1b2c7af8 MC |
1143 | ISCSI_DBG_SESSION(session, "[op 0x%x cid %d itt 0x%x len %d]\n", |
1144 | opcode, conn->id, itt, datalen); | |
7996a778 | 1145 | |
3e5c28ad | 1146 | if (itt == ~0U) { |
77a23c21 | 1147 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); |
62f38300 | 1148 | |
7996a778 MC |
1149 | switch(opcode) { |
1150 | case ISCSI_OP_NOOP_IN: | |
40527afe | 1151 | if (datalen) { |
7996a778 | 1152 | rc = ISCSI_ERR_PROTO; |
40527afe MC |
1153 | break; |
1154 | } | |
1155 | ||
b4377356 | 1156 | if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG)) |
40527afe MC |
1157 | break; |
1158 | ||
f6d5180c | 1159 | iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr); |
7996a778 MC |
1160 | break; |
1161 | case ISCSI_OP_REJECT: | |
62f38300 MC |
1162 | rc = iscsi_handle_reject(conn, hdr, data, datalen); |
1163 | break; | |
7996a778 | 1164 | case ISCSI_OP_ASYNC_EVENT: |
8d2860b3 | 1165 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; |
5831c737 MC |
1166 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) |
1167 | rc = ISCSI_ERR_CONN_FAILED; | |
7996a778 MC |
1168 | break; |
1169 | default: | |
1170 | rc = ISCSI_ERR_BAD_OPCODE; | |
1171 | break; | |
1172 | } | |
3e5c28ad MC |
1173 | goto out; |
1174 | } | |
1175 | ||
3e5c28ad MC |
1176 | switch(opcode) { |
1177 | case ISCSI_OP_SCSI_CMD_RSP: | |
913e5bf4 MC |
1178 | case ISCSI_OP_SCSI_DATA_IN: |
1179 | task = iscsi_itt_to_ctask(conn, hdr->itt); | |
1180 | if (!task) | |
1181 | return ISCSI_ERR_BAD_ITT; | |
d355e57d | 1182 | task->last_xfer = jiffies; |
913e5bf4 MC |
1183 | break; |
1184 | case ISCSI_OP_R2T: | |
1185 | /* | |
1186 | * LLD handles R2Ts if they need to. | |
1187 | */ | |
1188 | return 0; | |
1189 | case ISCSI_OP_LOGOUT_RSP: | |
1190 | case ISCSI_OP_LOGIN_RSP: | |
1191 | case ISCSI_OP_TEXT_RSP: | |
1192 | case ISCSI_OP_SCSI_TMFUNC_RSP: | |
1193 | case ISCSI_OP_NOOP_IN: | |
1194 | task = iscsi_itt_to_task(conn, hdr->itt); | |
1195 | if (!task) | |
1196 | return ISCSI_ERR_BAD_ITT; | |
1197 | break; | |
1198 | default: | |
1199 | return ISCSI_ERR_BAD_OPCODE; | |
1200 | } | |
1201 | ||
1202 | switch(opcode) { | |
1203 | case ISCSI_OP_SCSI_CMD_RSP: | |
9c19a7d0 | 1204 | iscsi_scsi_cmd_rsp(conn, hdr, task, data, datalen); |
3e5c28ad MC |
1205 | break; |
1206 | case ISCSI_OP_SCSI_DATA_IN: | |
1d9edf02 | 1207 | iscsi_data_in_rsp(conn, hdr, task); |
3e5c28ad | 1208 | break; |
3e5c28ad MC |
1209 | case ISCSI_OP_LOGOUT_RSP: |
1210 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
1211 | if (datalen) { | |
1212 | rc = ISCSI_ERR_PROTO; | |
1213 | break; | |
1214 | } | |
1215 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
1216 | goto recv_pdu; | |
1217 | case ISCSI_OP_LOGIN_RSP: | |
1218 | case ISCSI_OP_TEXT_RSP: | |
1219 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
1220 | /* | |
1221 | * login related PDU's exp_statsn is handled in | |
1222 | * userspace | |
1223 | */ | |
1224 | goto recv_pdu; | |
1225 | case ISCSI_OP_SCSI_TMFUNC_RSP: | |
1226 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
1227 | if (datalen) { | |
1228 | rc = ISCSI_ERR_PROTO; | |
1229 | break; | |
1230 | } | |
1231 | ||
1232 | iscsi_tmf_rsp(conn, hdr); | |
b3cd5050 | 1233 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); |
3e5c28ad MC |
1234 | break; |
1235 | case ISCSI_OP_NOOP_IN: | |
1236 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
1237 | if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) { | |
1238 | rc = ISCSI_ERR_PROTO; | |
1239 | break; | |
1240 | } | |
1241 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
1242 | ||
8afa1439 MC |
1243 | rc = iscsi_nop_out_rsp(task, (struct iscsi_nopin*)hdr, |
1244 | data, datalen); | |
3e5c28ad MC |
1245 | break; |
1246 | default: | |
1247 | rc = ISCSI_ERR_BAD_OPCODE; | |
1248 | break; | |
1249 | } | |
7996a778 | 1250 | |
3e5c28ad MC |
1251 | out: |
1252 | return rc; | |
1253 | recv_pdu: | |
1254 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) | |
1255 | rc = ISCSI_ERR_CONN_FAILED; | |
b3cd5050 | 1256 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); |
7996a778 MC |
1257 | return rc; |
1258 | } | |
913e5bf4 | 1259 | EXPORT_SYMBOL_GPL(__iscsi_complete_pdu); |
7996a778 MC |
1260 | |
1261 | int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
1262 | char *data, int datalen) | |
1263 | { | |
1264 | int rc; | |
1265 | ||
1266 | spin_lock(&conn->session->lock); | |
1267 | rc = __iscsi_complete_pdu(conn, hdr, data, datalen); | |
1268 | spin_unlock(&conn->session->lock); | |
1269 | return rc; | |
1270 | } | |
1271 | EXPORT_SYMBOL_GPL(iscsi_complete_pdu); | |
1272 | ||
0af967f5 | 1273 | int iscsi_verify_itt(struct iscsi_conn *conn, itt_t itt) |
7996a778 MC |
1274 | { |
1275 | struct iscsi_session *session = conn->session; | |
262ef636 | 1276 | int age = 0, i = 0; |
7996a778 | 1277 | |
0af967f5 MC |
1278 | if (itt == RESERVED_ITT) |
1279 | return 0; | |
7996a778 | 1280 | |
262ef636 MC |
1281 | if (session->tt->parse_pdu_itt) |
1282 | session->tt->parse_pdu_itt(conn, itt, &i, &age); | |
1283 | else { | |
1284 | i = get_itt(itt); | |
1285 | age = ((__force u32)itt >> ISCSI_AGE_SHIFT) & ISCSI_AGE_MASK; | |
1286 | } | |
1287 | ||
1288 | if (age != session->age) { | |
0af967f5 MC |
1289 | iscsi_conn_printk(KERN_ERR, conn, |
1290 | "received itt %x expected session age (%x)\n", | |
913e5bf4 | 1291 | (__force u32)itt, session->age); |
0af967f5 MC |
1292 | return ISCSI_ERR_BAD_ITT; |
1293 | } | |
7996a778 | 1294 | |
3e5c28ad MC |
1295 | if (i >= session->cmds_max) { |
1296 | iscsi_conn_printk(KERN_ERR, conn, | |
1297 | "received invalid itt index %u (max cmds " | |
1298 | "%u.\n", i, session->cmds_max); | |
1299 | return ISCSI_ERR_BAD_ITT; | |
7996a778 | 1300 | } |
7996a778 MC |
1301 | return 0; |
1302 | } | |
1303 | EXPORT_SYMBOL_GPL(iscsi_verify_itt); | |
1304 | ||
913e5bf4 MC |
1305 | /** |
1306 | * iscsi_itt_to_ctask - look up ctask by itt | |
1307 | * @conn: iscsi connection | |
1308 | * @itt: itt | |
1309 | * | |
1310 | * This should be used for cmd tasks. | |
1311 | * | |
1312 | * The session lock must be held. | |
1313 | */ | |
1314 | struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *conn, itt_t itt) | |
0af967f5 | 1315 | { |
9c19a7d0 | 1316 | struct iscsi_task *task; |
0af967f5 MC |
1317 | |
1318 | if (iscsi_verify_itt(conn, itt)) | |
1319 | return NULL; | |
1320 | ||
913e5bf4 MC |
1321 | task = iscsi_itt_to_task(conn, itt); |
1322 | if (!task || !task->sc) | |
0af967f5 MC |
1323 | return NULL; |
1324 | ||
913e5bf4 MC |
1325 | if (task->sc->SCp.phase != conn->session->age) { |
1326 | iscsi_session_printk(KERN_ERR, conn->session, | |
1327 | "task's session age %d, expected %d\n", | |
1328 | task->sc->SCp.phase, conn->session->age); | |
0af967f5 | 1329 | return NULL; |
913e5bf4 | 1330 | } |
0af967f5 | 1331 | |
9c19a7d0 | 1332 | return task; |
0af967f5 MC |
1333 | } |
1334 | EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask); | |
1335 | ||
40a06e75 | 1336 | void iscsi_session_failure(struct iscsi_session *session, |
e5bd7b54 MC |
1337 | enum iscsi_err err) |
1338 | { | |
e5bd7b54 MC |
1339 | struct iscsi_conn *conn; |
1340 | struct device *dev; | |
1341 | unsigned long flags; | |
1342 | ||
1343 | spin_lock_irqsave(&session->lock, flags); | |
1344 | conn = session->leadconn; | |
1345 | if (session->state == ISCSI_STATE_TERMINATE || !conn) { | |
1346 | spin_unlock_irqrestore(&session->lock, flags); | |
1347 | return; | |
1348 | } | |
1349 | ||
1350 | dev = get_device(&conn->cls_conn->dev); | |
1351 | spin_unlock_irqrestore(&session->lock, flags); | |
1352 | if (!dev) | |
1353 | return; | |
1354 | /* | |
1355 | * if the host is being removed bypass the connection | |
1356 | * recovery initialization because we are going to kill | |
1357 | * the session. | |
1358 | */ | |
1359 | if (err == ISCSI_ERR_INVALID_HOST) | |
1360 | iscsi_conn_error_event(conn->cls_conn, err); | |
1361 | else | |
1362 | iscsi_conn_failure(conn, err); | |
1363 | put_device(dev); | |
1364 | } | |
1365 | EXPORT_SYMBOL_GPL(iscsi_session_failure); | |
1366 | ||
7996a778 MC |
1367 | void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err) |
1368 | { | |
1369 | struct iscsi_session *session = conn->session; | |
1370 | unsigned long flags; | |
1371 | ||
1372 | spin_lock_irqsave(&session->lock, flags); | |
656cffc9 MC |
1373 | if (session->state == ISCSI_STATE_FAILED) { |
1374 | spin_unlock_irqrestore(&session->lock, flags); | |
1375 | return; | |
1376 | } | |
1377 | ||
67a61114 | 1378 | if (conn->stop_stage == 0) |
7996a778 MC |
1379 | session->state = ISCSI_STATE_FAILED; |
1380 | spin_unlock_irqrestore(&session->lock, flags); | |
e5bd7b54 | 1381 | |
7996a778 MC |
1382 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); |
1383 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
e5bd7b54 | 1384 | iscsi_conn_error_event(conn->cls_conn, err); |
7996a778 MC |
1385 | } |
1386 | EXPORT_SYMBOL_GPL(iscsi_conn_failure); | |
1387 | ||
77a23c21 MC |
1388 | static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn) |
1389 | { | |
1390 | struct iscsi_session *session = conn->session; | |
1391 | ||
1392 | /* | |
1393 | * Check for iSCSI window and take care of CmdSN wrap-around | |
1394 | */ | |
e0726407 | 1395 | if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) { |
1b2c7af8 MC |
1396 | ISCSI_DBG_SESSION(session, "iSCSI CmdSN closed. ExpCmdSn " |
1397 | "%u MaxCmdSN %u CmdSN %u/%u\n", | |
1398 | session->exp_cmdsn, session->max_cmdsn, | |
1399 | session->cmdsn, session->queued_cmdsn); | |
77a23c21 MC |
1400 | return -ENOSPC; |
1401 | } | |
1402 | return 0; | |
1403 | } | |
1404 | ||
9c19a7d0 | 1405 | static int iscsi_xmit_task(struct iscsi_conn *conn) |
77a23c21 | 1406 | { |
9c19a7d0 | 1407 | struct iscsi_task *task = conn->task; |
843c0a8a | 1408 | int rc; |
77a23c21 | 1409 | |
70b31c15 MC |
1410 | if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) |
1411 | return -ENODATA; | |
1412 | ||
9c19a7d0 | 1413 | __iscsi_get_task(task); |
77a23c21 | 1414 | spin_unlock_bh(&conn->session->lock); |
9c19a7d0 | 1415 | rc = conn->session->tt->xmit_task(task); |
77a23c21 | 1416 | spin_lock_bh(&conn->session->lock); |
d355e57d | 1417 | if (!rc) { |
9c19a7d0 | 1418 | /* done with this task */ |
d355e57d | 1419 | task->last_xfer = jiffies; |
9c19a7d0 | 1420 | conn->task = NULL; |
d355e57d MC |
1421 | } |
1422 | __iscsi_put_task(task); | |
77a23c21 MC |
1423 | return rc; |
1424 | } | |
1425 | ||
843c0a8a | 1426 | /** |
9c19a7d0 MC |
1427 | * iscsi_requeue_task - requeue task to run from session workqueue |
1428 | * @task: task to requeue | |
843c0a8a | 1429 | * |
9c19a7d0 | 1430 | * LLDs that need to run a task from the session workqueue should call |
052d0144 MC |
1431 | * this. The session lock must be held. This should only be called |
1432 | * by software drivers. | |
843c0a8a | 1433 | */ |
9c19a7d0 | 1434 | void iscsi_requeue_task(struct iscsi_task *task) |
843c0a8a | 1435 | { |
9c19a7d0 | 1436 | struct iscsi_conn *conn = task->conn; |
843c0a8a | 1437 | |
3bbaaad9 MC |
1438 | /* |
1439 | * this may be on the requeue list already if the xmit_task callout | |
1440 | * is handling the r2ts while we are adding new ones | |
1441 | */ | |
1442 | if (list_empty(&task->running)) | |
1443 | list_add_tail(&task->running, &conn->requeue); | |
32ae763e | 1444 | iscsi_conn_queue_work(conn); |
843c0a8a | 1445 | } |
9c19a7d0 | 1446 | EXPORT_SYMBOL_GPL(iscsi_requeue_task); |
843c0a8a | 1447 | |
7996a778 MC |
1448 | /** |
1449 | * iscsi_data_xmit - xmit any command into the scheduled connection | |
1450 | * @conn: iscsi connection | |
1451 | * | |
1452 | * Notes: | |
1453 | * The function can return -EAGAIN in which case the caller must | |
1454 | * re-schedule it again later or recover. '0' return code means | |
1455 | * successful xmit. | |
1456 | **/ | |
1457 | static int iscsi_data_xmit(struct iscsi_conn *conn) | |
1458 | { | |
5d12c05e | 1459 | struct iscsi_task *task; |
3219e529 | 1460 | int rc = 0; |
7996a778 | 1461 | |
77a23c21 | 1462 | spin_lock_bh(&conn->session->lock); |
70b31c15 | 1463 | if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) { |
1b2c7af8 | 1464 | ISCSI_DBG_SESSION(conn->session, "Tx suspended!\n"); |
77a23c21 | 1465 | spin_unlock_bh(&conn->session->lock); |
3219e529 | 1466 | return -ENODATA; |
7996a778 | 1467 | } |
7996a778 | 1468 | |
9c19a7d0 MC |
1469 | if (conn->task) { |
1470 | rc = iscsi_xmit_task(conn); | |
3219e529 | 1471 | if (rc) |
70b31c15 | 1472 | goto done; |
7996a778 MC |
1473 | } |
1474 | ||
77a23c21 MC |
1475 | /* |
1476 | * process mgmt pdus like nops before commands since we should | |
1477 | * only have one nop-out as a ping from us and targets should not | |
1478 | * overflow us with nop-ins | |
1479 | */ | |
1480 | check_mgmt: | |
843c0a8a | 1481 | while (!list_empty(&conn->mgmtqueue)) { |
9c19a7d0 MC |
1482 | conn->task = list_entry(conn->mgmtqueue.next, |
1483 | struct iscsi_task, running); | |
3bbaaad9 | 1484 | list_del_init(&conn->task->running); |
9c19a7d0 MC |
1485 | if (iscsi_prep_mgmt_task(conn, conn->task)) { |
1486 | __iscsi_put_task(conn->task); | |
1487 | conn->task = NULL; | |
b3a7ea8d MC |
1488 | continue; |
1489 | } | |
9c19a7d0 | 1490 | rc = iscsi_xmit_task(conn); |
77a23c21 | 1491 | if (rc) |
70b31c15 | 1492 | goto done; |
7996a778 MC |
1493 | } |
1494 | ||
843c0a8a | 1495 | /* process pending command queue */ |
3bbaaad9 | 1496 | while (!list_empty(&conn->cmdqueue)) { |
5d12c05e MC |
1497 | conn->task = list_entry(conn->cmdqueue.next, struct iscsi_task, |
1498 | running); | |
3bbaaad9 | 1499 | list_del_init(&conn->task->running); |
b3a7ea8d | 1500 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) { |
b3cd5050 | 1501 | fail_scsi_task(conn->task, DID_IMM_RETRY); |
b3a7ea8d MC |
1502 | continue; |
1503 | } | |
577577da MC |
1504 | rc = iscsi_prep_scsi_cmd_pdu(conn->task); |
1505 | if (rc) { | |
5d12c05e | 1506 | if (rc == -ENOMEM || rc == -EACCES) { |
3bbaaad9 MC |
1507 | list_add_tail(&conn->task->running, |
1508 | &conn->cmdqueue); | |
577577da | 1509 | conn->task = NULL; |
70b31c15 | 1510 | goto done; |
577577da | 1511 | } else |
b3cd5050 | 1512 | fail_scsi_task(conn->task, DID_ABORT); |
004d6530 BH |
1513 | continue; |
1514 | } | |
9c19a7d0 | 1515 | rc = iscsi_xmit_task(conn); |
77a23c21 | 1516 | if (rc) |
70b31c15 | 1517 | goto done; |
77a23c21 | 1518 | /* |
9c19a7d0 | 1519 | * we could continuously get new task requests so |
77a23c21 MC |
1520 | * we need to check the mgmt queue for nops that need to |
1521 | * be sent to aviod starvation | |
1522 | */ | |
843c0a8a MC |
1523 | if (!list_empty(&conn->mgmtqueue)) |
1524 | goto check_mgmt; | |
1525 | } | |
1526 | ||
1527 | while (!list_empty(&conn->requeue)) { | |
b3a7ea8d MC |
1528 | /* |
1529 | * we always do fastlogout - conn stop code will clean up. | |
1530 | */ | |
1531 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) | |
1532 | break; | |
1533 | ||
5d12c05e MC |
1534 | task = list_entry(conn->requeue.next, struct iscsi_task, |
1535 | running); | |
1536 | if (iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_DATA_OUT)) | |
1537 | break; | |
1538 | ||
1539 | conn->task = task; | |
3bbaaad9 | 1540 | list_del_init(&conn->task->running); |
9c19a7d0 | 1541 | conn->task->state = ISCSI_TASK_RUNNING; |
9c19a7d0 | 1542 | rc = iscsi_xmit_task(conn); |
843c0a8a | 1543 | if (rc) |
70b31c15 | 1544 | goto done; |
843c0a8a | 1545 | if (!list_empty(&conn->mgmtqueue)) |
77a23c21 | 1546 | goto check_mgmt; |
7996a778 | 1547 | } |
b6c395ed | 1548 | spin_unlock_bh(&conn->session->lock); |
3219e529 | 1549 | return -ENODATA; |
7996a778 | 1550 | |
70b31c15 | 1551 | done: |
77a23c21 | 1552 | spin_unlock_bh(&conn->session->lock); |
3219e529 | 1553 | return rc; |
7996a778 MC |
1554 | } |
1555 | ||
c4028958 | 1556 | static void iscsi_xmitworker(struct work_struct *work) |
7996a778 | 1557 | { |
c4028958 DH |
1558 | struct iscsi_conn *conn = |
1559 | container_of(work, struct iscsi_conn, xmitwork); | |
3219e529 | 1560 | int rc; |
7996a778 MC |
1561 | /* |
1562 | * serialize Xmit worker on a per-connection basis. | |
1563 | */ | |
3219e529 MC |
1564 | do { |
1565 | rc = iscsi_data_xmit(conn); | |
1566 | } while (rc >= 0 || rc == -EAGAIN); | |
7996a778 MC |
1567 | } |
1568 | ||
577577da MC |
1569 | static inline struct iscsi_task *iscsi_alloc_task(struct iscsi_conn *conn, |
1570 | struct scsi_cmnd *sc) | |
1571 | { | |
1572 | struct iscsi_task *task; | |
1573 | ||
7acd72eb | 1574 | if (!kfifo_out(&conn->session->cmdpool.queue, |
577577da MC |
1575 | (void *) &task, sizeof(void *))) |
1576 | return NULL; | |
1577 | ||
1578 | sc->SCp.phase = conn->session->age; | |
1579 | sc->SCp.ptr = (char *) task; | |
1580 | ||
1581 | atomic_set(&task->refcount, 1); | |
1582 | task->state = ISCSI_TASK_PENDING; | |
1583 | task->conn = conn; | |
1584 | task->sc = sc; | |
d355e57d MC |
1585 | task->have_checked_conn = false; |
1586 | task->last_timeout = jiffies; | |
1587 | task->last_xfer = jiffies; | |
577577da MC |
1588 | INIT_LIST_HEAD(&task->running); |
1589 | return task; | |
1590 | } | |
1591 | ||
7996a778 MC |
1592 | enum { |
1593 | FAILURE_BAD_HOST = 1, | |
1594 | FAILURE_SESSION_FAILED, | |
1595 | FAILURE_SESSION_FREED, | |
1596 | FAILURE_WINDOW_CLOSED, | |
60ecebf5 | 1597 | FAILURE_OOM, |
7996a778 | 1598 | FAILURE_SESSION_TERMINATE, |
656cffc9 | 1599 | FAILURE_SESSION_IN_RECOVERY, |
7996a778 | 1600 | FAILURE_SESSION_RECOVERY_TIMEOUT, |
b3a7ea8d | 1601 | FAILURE_SESSION_LOGGING_OUT, |
6eabafbe | 1602 | FAILURE_SESSION_NOT_READY, |
7996a778 MC |
1603 | }; |
1604 | ||
f41d4721 | 1605 | int iscsi_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc) |
7996a778 | 1606 | { |
75613521 | 1607 | struct iscsi_cls_session *cls_session; |
1336aed1 | 1608 | struct iscsi_host *ihost; |
7996a778 MC |
1609 | int reason = 0; |
1610 | struct iscsi_session *session; | |
1611 | struct iscsi_conn *conn; | |
9c19a7d0 | 1612 | struct iscsi_task *task = NULL; |
7996a778 | 1613 | |
7996a778 | 1614 | sc->result = 0; |
f47f2cf5 | 1615 | sc->SCp.ptr = NULL; |
7996a778 | 1616 | |
1336aed1 | 1617 | ihost = shost_priv(host); |
7996a778 | 1618 | |
75613521 MC |
1619 | cls_session = starget_to_session(scsi_target(sc->device)); |
1620 | session = cls_session->dd_data; | |
f41d4721 | 1621 | spin_lock_bh(&session->lock); |
7996a778 | 1622 | |
75613521 | 1623 | reason = iscsi_session_chkready(cls_session); |
6eabafbe MC |
1624 | if (reason) { |
1625 | sc->result = reason; | |
1626 | goto fault; | |
1627 | } | |
1628 | ||
301e0f7e | 1629 | if (session->state != ISCSI_STATE_LOGGED_IN) { |
656cffc9 MC |
1630 | /* |
1631 | * to handle the race between when we set the recovery state | |
1632 | * and block the session we requeue here (commands could | |
1633 | * be entering our queuecommand while a block is starting | |
1634 | * up because the block code is not locked) | |
1635 | */ | |
9000bcd6 | 1636 | switch (session->state) { |
301e0f7e | 1637 | case ISCSI_STATE_FAILED: |
9000bcd6 | 1638 | case ISCSI_STATE_IN_RECOVERY: |
656cffc9 | 1639 | reason = FAILURE_SESSION_IN_RECOVERY; |
301e0f7e MC |
1640 | sc->result = DID_IMM_RETRY << 16; |
1641 | break; | |
9000bcd6 MC |
1642 | case ISCSI_STATE_LOGGING_OUT: |
1643 | reason = FAILURE_SESSION_LOGGING_OUT; | |
301e0f7e MC |
1644 | sc->result = DID_IMM_RETRY << 16; |
1645 | break; | |
b3a7ea8d | 1646 | case ISCSI_STATE_RECOVERY_FAILED: |
656cffc9 | 1647 | reason = FAILURE_SESSION_RECOVERY_TIMEOUT; |
56d7fcfa | 1648 | sc->result = DID_TRANSPORT_FAILFAST << 16; |
b3a7ea8d MC |
1649 | break; |
1650 | case ISCSI_STATE_TERMINATE: | |
656cffc9 | 1651 | reason = FAILURE_SESSION_TERMINATE; |
6eabafbe | 1652 | sc->result = DID_NO_CONNECT << 16; |
b3a7ea8d | 1653 | break; |
b3a7ea8d | 1654 | default: |
656cffc9 | 1655 | reason = FAILURE_SESSION_FREED; |
6eabafbe | 1656 | sc->result = DID_NO_CONNECT << 16; |
b3a7ea8d | 1657 | } |
7996a778 MC |
1658 | goto fault; |
1659 | } | |
1660 | ||
7996a778 | 1661 | conn = session->leadconn; |
98644047 MC |
1662 | if (!conn) { |
1663 | reason = FAILURE_SESSION_FREED; | |
6eabafbe | 1664 | sc->result = DID_NO_CONNECT << 16; |
98644047 MC |
1665 | goto fault; |
1666 | } | |
7996a778 | 1667 | |
661134ad MC |
1668 | if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) { |
1669 | reason = FAILURE_SESSION_IN_RECOVERY; | |
1670 | sc->result = DID_REQUEUE; | |
1671 | goto fault; | |
1672 | } | |
1673 | ||
77a23c21 MC |
1674 | if (iscsi_check_cmdsn_window_closed(conn)) { |
1675 | reason = FAILURE_WINDOW_CLOSED; | |
1676 | goto reject; | |
1677 | } | |
1678 | ||
577577da MC |
1679 | task = iscsi_alloc_task(conn, sc); |
1680 | if (!task) { | |
60ecebf5 MC |
1681 | reason = FAILURE_OOM; |
1682 | goto reject; | |
1683 | } | |
7996a778 | 1684 | |
1336aed1 | 1685 | if (!ihost->workq) { |
577577da MC |
1686 | reason = iscsi_prep_scsi_cmd_pdu(task); |
1687 | if (reason) { | |
5d12c05e | 1688 | if (reason == -ENOMEM || reason == -EACCES) { |
577577da MC |
1689 | reason = FAILURE_OOM; |
1690 | goto prepd_reject; | |
1691 | } else { | |
1692 | sc->result = DID_ABORT << 16; | |
1693 | goto prepd_fault; | |
1694 | } | |
052d0144 | 1695 | } |
9c19a7d0 | 1696 | if (session->tt->xmit_task(task)) { |
d3305f34 | 1697 | session->cmdsn--; |
052d0144 | 1698 | reason = FAILURE_SESSION_NOT_READY; |
577577da | 1699 | goto prepd_reject; |
052d0144 | 1700 | } |
3bbaaad9 MC |
1701 | } else { |
1702 | list_add_tail(&task->running, &conn->cmdqueue); | |
32ae763e | 1703 | iscsi_conn_queue_work(conn); |
3bbaaad9 | 1704 | } |
052d0144 MC |
1705 | |
1706 | session->queued_cmdsn++; | |
f41d4721 | 1707 | spin_unlock_bh(&session->lock); |
7996a778 MC |
1708 | return 0; |
1709 | ||
577577da | 1710 | prepd_reject: |
f41d4721 | 1711 | iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ); |
7996a778 | 1712 | reject: |
f41d4721 | 1713 | spin_unlock_bh(&session->lock); |
1b2c7af8 MC |
1714 | ISCSI_DBG_SESSION(session, "cmd 0x%x rejected (%d)\n", |
1715 | sc->cmnd[0], reason); | |
d6d13ee1 | 1716 | return SCSI_MLQUEUE_TARGET_BUSY; |
7996a778 | 1717 | |
577577da | 1718 | prepd_fault: |
f41d4721 | 1719 | iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ); |
7996a778 | 1720 | fault: |
f41d4721 | 1721 | spin_unlock_bh(&session->lock); |
1b2c7af8 MC |
1722 | ISCSI_DBG_SESSION(session, "iscsi: cmd 0x%x is not queued (%d)\n", |
1723 | sc->cmnd[0], reason); | |
c07d4444 BH |
1724 | if (!scsi_bidi_cmnd(sc)) |
1725 | scsi_set_resid(sc, scsi_bufflen(sc)); | |
1726 | else { | |
1727 | scsi_out(sc)->resid = scsi_out(sc)->length; | |
1728 | scsi_in(sc)->resid = scsi_in(sc)->length; | |
1729 | } | |
f41d4721 | 1730 | sc->scsi_done(sc); |
7996a778 MC |
1731 | return 0; |
1732 | } | |
1733 | EXPORT_SYMBOL_GPL(iscsi_queuecommand); | |
1734 | ||
e881a172 | 1735 | int iscsi_change_queue_depth(struct scsi_device *sdev, int depth, int reason) |
7996a778 | 1736 | { |
1796e722 MC |
1737 | switch (reason) { |
1738 | case SCSI_QDEPTH_DEFAULT: | |
1739 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); | |
1740 | break; | |
1741 | case SCSI_QDEPTH_QFULL: | |
1742 | scsi_track_queue_full(sdev, depth); | |
1743 | break; | |
1744 | case SCSI_QDEPTH_RAMP_UP: | |
1745 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); | |
1746 | break; | |
1747 | default: | |
e881a172 | 1748 | return -EOPNOTSUPP; |
1796e722 | 1749 | } |
7996a778 MC |
1750 | return sdev->queue_depth; |
1751 | } | |
1752 | EXPORT_SYMBOL_GPL(iscsi_change_queue_depth); | |
1753 | ||
6b5d6c44 MC |
1754 | int iscsi_target_alloc(struct scsi_target *starget) |
1755 | { | |
1756 | struct iscsi_cls_session *cls_session = starget_to_session(starget); | |
1757 | struct iscsi_session *session = cls_session->dd_data; | |
1758 | ||
1759 | starget->can_queue = session->scsi_cmds_max; | |
1760 | return 0; | |
1761 | } | |
1762 | EXPORT_SYMBOL_GPL(iscsi_target_alloc); | |
1763 | ||
843c0a8a | 1764 | static void iscsi_tmf_timedout(unsigned long data) |
7996a778 | 1765 | { |
843c0a8a | 1766 | struct iscsi_conn *conn = (struct iscsi_conn *)data; |
7996a778 MC |
1767 | struct iscsi_session *session = conn->session; |
1768 | ||
1769 | spin_lock(&session->lock); | |
843c0a8a MC |
1770 | if (conn->tmf_state == TMF_QUEUED) { |
1771 | conn->tmf_state = TMF_TIMEDOUT; | |
bd2199d4 | 1772 | ISCSI_DBG_EH(session, "tmf timedout\n"); |
7996a778 MC |
1773 | /* unblock eh_abort() */ |
1774 | wake_up(&conn->ehwait); | |
1775 | } | |
1776 | spin_unlock(&session->lock); | |
1777 | } | |
1778 | ||
9c19a7d0 | 1779 | static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn, |
f6d5180c MC |
1780 | struct iscsi_tm *hdr, int age, |
1781 | int timeout) | |
7996a778 | 1782 | { |
7996a778 | 1783 | struct iscsi_session *session = conn->session; |
9c19a7d0 | 1784 | struct iscsi_task *task; |
7996a778 | 1785 | |
9c19a7d0 | 1786 | task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr, |
843c0a8a | 1787 | NULL, 0); |
9c19a7d0 | 1788 | if (!task) { |
6724add1 | 1789 | spin_unlock_bh(&session->lock); |
df4da5cd | 1790 | iscsi_conn_printk(KERN_ERR, conn, "Could not send TMF.\n"); |
7996a778 | 1791 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
843c0a8a | 1792 | spin_lock_bh(&session->lock); |
77a23c21 | 1793 | return -EPERM; |
7996a778 | 1794 | } |
843c0a8a | 1795 | conn->tmfcmd_pdus_cnt++; |
f6d5180c | 1796 | conn->tmf_timer.expires = timeout * HZ + jiffies; |
843c0a8a MC |
1797 | conn->tmf_timer.function = iscsi_tmf_timedout; |
1798 | conn->tmf_timer.data = (unsigned long)conn; | |
1799 | add_timer(&conn->tmf_timer); | |
bd2199d4 | 1800 | ISCSI_DBG_EH(session, "tmf set timeout\n"); |
7996a778 | 1801 | |
7996a778 | 1802 | spin_unlock_bh(&session->lock); |
6724add1 | 1803 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1804 | |
1805 | /* | |
1806 | * block eh thread until: | |
1807 | * | |
843c0a8a MC |
1808 | * 1) tmf response |
1809 | * 2) tmf timeout | |
7996a778 MC |
1810 | * 3) session is terminated or restarted or userspace has |
1811 | * given up on recovery | |
1812 | */ | |
843c0a8a | 1813 | wait_event_interruptible(conn->ehwait, age != session->age || |
7996a778 | 1814 | session->state != ISCSI_STATE_LOGGED_IN || |
843c0a8a | 1815 | conn->tmf_state != TMF_QUEUED); |
7996a778 MC |
1816 | if (signal_pending(current)) |
1817 | flush_signals(current); | |
843c0a8a MC |
1818 | del_timer_sync(&conn->tmf_timer); |
1819 | ||
6724add1 | 1820 | mutex_lock(&session->eh_mutex); |
77a23c21 | 1821 | spin_lock_bh(&session->lock); |
9c19a7d0 | 1822 | /* if the session drops it will clean up the task */ |
843c0a8a MC |
1823 | if (age != session->age || |
1824 | session->state != ISCSI_STATE_LOGGED_IN) | |
1825 | return -ENOTCONN; | |
7996a778 MC |
1826 | return 0; |
1827 | } | |
1828 | ||
843c0a8a MC |
1829 | /* |
1830 | * Fail commands. session lock held and recv side suspended and xmit | |
1831 | * thread flushed | |
1832 | */ | |
3bbaaad9 MC |
1833 | static void fail_scsi_tasks(struct iscsi_conn *conn, unsigned lun, |
1834 | int error) | |
843c0a8a | 1835 | { |
3bbaaad9 MC |
1836 | struct iscsi_task *task; |
1837 | int i; | |
843c0a8a | 1838 | |
3bbaaad9 MC |
1839 | for (i = 0; i < conn->session->cmds_max; i++) { |
1840 | task = conn->session->cmds[i]; | |
1841 | if (!task->sc || task->state == ISCSI_TASK_FREE) | |
1842 | continue; | |
843c0a8a | 1843 | |
3bbaaad9 MC |
1844 | if (lun != -1 && lun != task->sc->device->lun) |
1845 | continue; | |
843c0a8a | 1846 | |
3bbaaad9 MC |
1847 | ISCSI_DBG_SESSION(conn->session, |
1848 | "failing sc %p itt 0x%x state %d\n", | |
1849 | task->sc, task->itt, task->state); | |
b3cd5050 | 1850 | fail_scsi_task(task, error); |
843c0a8a MC |
1851 | } |
1852 | } | |
1853 | ||
661134ad MC |
1854 | /** |
1855 | * iscsi_suspend_queue - suspend iscsi_queuecommand | |
1856 | * @conn: iscsi conn to stop queueing IO on | |
1857 | * | |
1858 | * This grabs the session lock to make sure no one is in | |
1859 | * xmit_task/queuecommand, and then sets suspend to prevent | |
1860 | * new commands from being queued. This only needs to be called | |
1861 | * by offload drivers that need to sync a path like ep disconnect | |
1862 | * with the iscsi_queuecommand/xmit_task. To start IO again libiscsi | |
1863 | * will call iscsi_start_tx and iscsi_unblock_session when in FFP. | |
1864 | */ | |
1865 | void iscsi_suspend_queue(struct iscsi_conn *conn) | |
1866 | { | |
1867 | spin_lock_bh(&conn->session->lock); | |
1868 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
1869 | spin_unlock_bh(&conn->session->lock); | |
1870 | } | |
1871 | EXPORT_SYMBOL_GPL(iscsi_suspend_queue); | |
1872 | ||
1873 | /** | |
1874 | * iscsi_suspend_tx - suspend iscsi_data_xmit | |
1875 | * @conn: iscsi conn tp stop processing IO on. | |
1876 | * | |
1877 | * This function sets the suspend bit to prevent iscsi_data_xmit | |
1878 | * from sending new IO, and if work is queued on the xmit thread | |
1879 | * it will wait for it to be completed. | |
1880 | */ | |
b40977d9 | 1881 | void iscsi_suspend_tx(struct iscsi_conn *conn) |
6724add1 | 1882 | { |
32ae763e MC |
1883 | struct Scsi_Host *shost = conn->session->host; |
1884 | struct iscsi_host *ihost = shost_priv(shost); | |
1885 | ||
6724add1 | 1886 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); |
1336aed1 | 1887 | if (ihost->workq) |
32ae763e | 1888 | flush_workqueue(ihost->workq); |
6724add1 | 1889 | } |
b40977d9 | 1890 | EXPORT_SYMBOL_GPL(iscsi_suspend_tx); |
6724add1 MC |
1891 | |
1892 | static void iscsi_start_tx(struct iscsi_conn *conn) | |
1893 | { | |
1894 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
1336aed1 | 1895 | iscsi_conn_queue_work(conn); |
6724add1 MC |
1896 | } |
1897 | ||
4c48a829 MC |
1898 | /* |
1899 | * We want to make sure a ping is in flight. It has timed out. | |
1900 | * And we are not busy processing a pdu that is making | |
1901 | * progress but got started before the ping and is taking a while | |
1902 | * to complete so the ping is just stuck behind it in a queue. | |
1903 | */ | |
1904 | static int iscsi_has_ping_timed_out(struct iscsi_conn *conn) | |
1905 | { | |
1906 | if (conn->ping_task && | |
1907 | time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) + | |
1908 | (conn->ping_timeout * HZ), jiffies)) | |
1909 | return 1; | |
1910 | else | |
1911 | return 0; | |
1912 | } | |
1913 | ||
d355e57d | 1914 | static enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *sc) |
f6d5180c | 1915 | { |
d355e57d | 1916 | enum blk_eh_timer_return rc = BLK_EH_NOT_HANDLED; |
92ed4d69 | 1917 | struct iscsi_task *task = NULL, *running_task; |
f6d5180c MC |
1918 | struct iscsi_cls_session *cls_session; |
1919 | struct iscsi_session *session; | |
1920 | struct iscsi_conn *conn; | |
92ed4d69 | 1921 | int i; |
f6d5180c | 1922 | |
d355e57d | 1923 | cls_session = starget_to_session(scsi_target(sc->device)); |
75613521 | 1924 | session = cls_session->dd_data; |
f6d5180c | 1925 | |
bd2199d4 | 1926 | ISCSI_DBG_EH(session, "scsi cmd %p timedout\n", sc); |
f6d5180c MC |
1927 | |
1928 | spin_lock(&session->lock); | |
1929 | if (session->state != ISCSI_STATE_LOGGED_IN) { | |
1930 | /* | |
1931 | * We are probably in the middle of iscsi recovery so let | |
1932 | * that complete and handle the error. | |
1933 | */ | |
242f9dcb | 1934 | rc = BLK_EH_RESET_TIMER; |
f6d5180c MC |
1935 | goto done; |
1936 | } | |
1937 | ||
1938 | conn = session->leadconn; | |
1939 | if (!conn) { | |
1940 | /* In the middle of shuting down */ | |
242f9dcb | 1941 | rc = BLK_EH_RESET_TIMER; |
f6d5180c MC |
1942 | goto done; |
1943 | } | |
1944 | ||
d355e57d | 1945 | task = (struct iscsi_task *)sc->SCp.ptr; |
92ed4d69 MC |
1946 | if (!task) { |
1947 | /* | |
1948 | * Raced with completion. Just reset timer, and let it | |
1949 | * complete normally | |
1950 | */ | |
1951 | rc = BLK_EH_RESET_TIMER; | |
d355e57d | 1952 | goto done; |
92ed4d69 MC |
1953 | } |
1954 | ||
d355e57d MC |
1955 | /* |
1956 | * If we have sent (at least queued to the network layer) a pdu or | |
1957 | * recvd one for the task since the last timeout ask for | |
1958 | * more time. If on the next timeout we have not made progress | |
1959 | * we can check if it is the task or connection when we send the | |
1960 | * nop as a ping. | |
1961 | */ | |
92ed4d69 | 1962 | if (time_after(task->last_xfer, task->last_timeout)) { |
bd2199d4 EZ |
1963 | ISCSI_DBG_EH(session, "Command making progress. Asking " |
1964 | "scsi-ml for more time to complete. " | |
92ed4d69 | 1965 | "Last data xfer at %lu. Last timeout was at " |
bd2199d4 | 1966 | "%lu\n.", task->last_xfer, task->last_timeout); |
d355e57d MC |
1967 | task->have_checked_conn = false; |
1968 | rc = BLK_EH_RESET_TIMER; | |
1969 | goto done; | |
1970 | } | |
1971 | ||
f6d5180c MC |
1972 | if (!conn->recv_timeout && !conn->ping_timeout) |
1973 | goto done; | |
1974 | /* | |
1975 | * if the ping timedout then we are in the middle of cleaning up | |
1976 | * and can let the iscsi eh handle it | |
1977 | */ | |
4c48a829 | 1978 | if (iscsi_has_ping_timed_out(conn)) { |
242f9dcb | 1979 | rc = BLK_EH_RESET_TIMER; |
4c48a829 MC |
1980 | goto done; |
1981 | } | |
d355e57d | 1982 | |
92ed4d69 MC |
1983 | for (i = 0; i < conn->session->cmds_max; i++) { |
1984 | running_task = conn->session->cmds[i]; | |
1985 | if (!running_task->sc || running_task == task || | |
1986 | running_task->state != ISCSI_TASK_RUNNING) | |
1987 | continue; | |
1988 | ||
1989 | /* | |
1990 | * Only check if cmds started before this one have made | |
1991 | * progress, or this could never fail | |
1992 | */ | |
1993 | if (time_after(running_task->sc->jiffies_at_alloc, | |
1994 | task->sc->jiffies_at_alloc)) | |
1995 | continue; | |
1996 | ||
1997 | if (time_after(running_task->last_xfer, task->last_timeout)) { | |
1998 | /* | |
1999 | * This task has not made progress, but a task | |
2000 | * started before us has transferred data since | |
2001 | * we started/last-checked. We could be queueing | |
2002 | * too many tasks or the LU is bad. | |
2003 | * | |
2004 | * If the device is bad the cmds ahead of us on | |
2005 | * other devs will complete, and this loop will | |
2006 | * eventually fail starting the scsi eh. | |
2007 | */ | |
2008 | ISCSI_DBG_EH(session, "Command has not made progress " | |
2009 | "but commands ahead of it have. " | |
2010 | "Asking scsi-ml for more time to " | |
2011 | "complete. Our last xfer vs running task " | |
2012 | "last xfer %lu/%lu. Last check %lu.\n", | |
2013 | task->last_xfer, running_task->last_xfer, | |
2014 | task->last_timeout); | |
2015 | rc = BLK_EH_RESET_TIMER; | |
2016 | goto done; | |
2017 | } | |
2018 | } | |
2019 | ||
d355e57d MC |
2020 | /* Assumes nop timeout is shorter than scsi cmd timeout */ |
2021 | if (task->have_checked_conn) | |
2022 | goto done; | |
2023 | ||
f6d5180c | 2024 | /* |
d355e57d MC |
2025 | * Checking the transport already or nop from a cmd timeout still |
2026 | * running | |
f6d5180c | 2027 | */ |
d355e57d MC |
2028 | if (conn->ping_task) { |
2029 | task->have_checked_conn = true; | |
242f9dcb | 2030 | rc = BLK_EH_RESET_TIMER; |
4c48a829 MC |
2031 | goto done; |
2032 | } | |
2033 | ||
d355e57d MC |
2034 | /* Make sure there is a transport check done */ |
2035 | iscsi_send_nopout(conn, NULL); | |
2036 | task->have_checked_conn = true; | |
2037 | rc = BLK_EH_RESET_TIMER; | |
2038 | ||
f6d5180c | 2039 | done: |
d355e57d MC |
2040 | if (task) |
2041 | task->last_timeout = jiffies; | |
f6d5180c | 2042 | spin_unlock(&session->lock); |
bd2199d4 EZ |
2043 | ISCSI_DBG_EH(session, "return %s\n", rc == BLK_EH_RESET_TIMER ? |
2044 | "timer reset" : "nh"); | |
f6d5180c MC |
2045 | return rc; |
2046 | } | |
2047 | ||
2048 | static void iscsi_check_transport_timeouts(unsigned long data) | |
2049 | { | |
2050 | struct iscsi_conn *conn = (struct iscsi_conn *)data; | |
2051 | struct iscsi_session *session = conn->session; | |
4cf10435 | 2052 | unsigned long recv_timeout, next_timeout = 0, last_recv; |
f6d5180c MC |
2053 | |
2054 | spin_lock(&session->lock); | |
2055 | if (session->state != ISCSI_STATE_LOGGED_IN) | |
2056 | goto done; | |
2057 | ||
4cf10435 MC |
2058 | recv_timeout = conn->recv_timeout; |
2059 | if (!recv_timeout) | |
f6d5180c MC |
2060 | goto done; |
2061 | ||
4cf10435 | 2062 | recv_timeout *= HZ; |
f6d5180c | 2063 | last_recv = conn->last_recv; |
4c48a829 MC |
2064 | |
2065 | if (iscsi_has_ping_timed_out(conn)) { | |
322d739d | 2066 | iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs " |
4c48a829 MC |
2067 | "expired, recv timeout %d, last rx %lu, " |
2068 | "last ping %lu, now %lu\n", | |
2069 | conn->ping_timeout, conn->recv_timeout, | |
2070 | last_recv, conn->last_ping, jiffies); | |
f6d5180c MC |
2071 | spin_unlock(&session->lock); |
2072 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
2073 | return; | |
2074 | } | |
2075 | ||
4cf10435 | 2076 | if (time_before_eq(last_recv + recv_timeout, jiffies)) { |
c8611f97 | 2077 | /* send a ping to try to provoke some traffic */ |
1b2c7af8 | 2078 | ISCSI_DBG_CONN(conn, "Sending nopout as ping\n"); |
c8611f97 | 2079 | iscsi_send_nopout(conn, NULL); |
4cf10435 | 2080 | next_timeout = conn->last_ping + (conn->ping_timeout * HZ); |
ad294e9c | 2081 | } else |
4cf10435 | 2082 | next_timeout = last_recv + recv_timeout; |
f6d5180c | 2083 | |
1b2c7af8 | 2084 | ISCSI_DBG_CONN(conn, "Setting next tmo %lu\n", next_timeout); |
ad294e9c | 2085 | mod_timer(&conn->transport_timer, next_timeout); |
f6d5180c MC |
2086 | done: |
2087 | spin_unlock(&session->lock); | |
2088 | } | |
2089 | ||
9c19a7d0 | 2090 | static void iscsi_prep_abort_task_pdu(struct iscsi_task *task, |
843c0a8a MC |
2091 | struct iscsi_tm *hdr) |
2092 | { | |
2093 | memset(hdr, 0, sizeof(*hdr)); | |
2094 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
2095 | hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK; | |
2096 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
577577da MC |
2097 | memcpy(hdr->lun, task->lun, sizeof(hdr->lun)); |
2098 | hdr->rtt = task->hdr_itt; | |
2099 | hdr->refcmdsn = task->cmdsn; | |
843c0a8a MC |
2100 | } |
2101 | ||
7996a778 MC |
2102 | int iscsi_eh_abort(struct scsi_cmnd *sc) |
2103 | { | |
75613521 MC |
2104 | struct iscsi_cls_session *cls_session; |
2105 | struct iscsi_session *session; | |
f47f2cf5 | 2106 | struct iscsi_conn *conn; |
9c19a7d0 | 2107 | struct iscsi_task *task; |
843c0a8a MC |
2108 | struct iscsi_tm *hdr; |
2109 | int rc, age; | |
7996a778 | 2110 | |
75613521 MC |
2111 | cls_session = starget_to_session(scsi_target(sc->device)); |
2112 | session = cls_session->dd_data; | |
2113 | ||
bd2199d4 | 2114 | ISCSI_DBG_EH(session, "aborting sc %p\n", sc); |
4421c9eb | 2115 | |
6724add1 MC |
2116 | mutex_lock(&session->eh_mutex); |
2117 | spin_lock_bh(&session->lock); | |
f47f2cf5 MC |
2118 | /* |
2119 | * if session was ISCSI_STATE_IN_RECOVERY then we may not have | |
2120 | * got the command. | |
2121 | */ | |
2122 | if (!sc->SCp.ptr) { | |
bd2199d4 EZ |
2123 | ISCSI_DBG_EH(session, "sc never reached iscsi layer or " |
2124 | "it completed.\n"); | |
6724add1 MC |
2125 | spin_unlock_bh(&session->lock); |
2126 | mutex_unlock(&session->eh_mutex); | |
f47f2cf5 MC |
2127 | return SUCCESS; |
2128 | } | |
2129 | ||
7996a778 MC |
2130 | /* |
2131 | * If we are not logged in or we have started a new session | |
2132 | * then let the host reset code handle this | |
2133 | */ | |
843c0a8a MC |
2134 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN || |
2135 | sc->SCp.phase != session->age) { | |
2136 | spin_unlock_bh(&session->lock); | |
2137 | mutex_unlock(&session->eh_mutex); | |
bd2199d4 | 2138 | ISCSI_DBG_EH(session, "failing abort due to dropped " |
4421c9eb | 2139 | "session.\n"); |
843c0a8a MC |
2140 | return FAILED; |
2141 | } | |
2142 | ||
2143 | conn = session->leadconn; | |
2144 | conn->eh_abort_cnt++; | |
2145 | age = session->age; | |
2146 | ||
9c19a7d0 | 2147 | task = (struct iscsi_task *)sc->SCp.ptr; |
bd2199d4 EZ |
2148 | ISCSI_DBG_EH(session, "aborting [sc %p itt 0x%x]\n", |
2149 | sc, task->itt); | |
7996a778 | 2150 | |
9c19a7d0 MC |
2151 | /* task completed before time out */ |
2152 | if (!task->sc) { | |
bd2199d4 | 2153 | ISCSI_DBG_EH(session, "sc completed while abort in progress\n"); |
77a23c21 | 2154 | goto success; |
7ea8b828 | 2155 | } |
7996a778 | 2156 | |
9c19a7d0 | 2157 | if (task->state == ISCSI_TASK_PENDING) { |
b3cd5050 | 2158 | fail_scsi_task(task, DID_ABORT); |
77a23c21 MC |
2159 | goto success; |
2160 | } | |
7996a778 | 2161 | |
843c0a8a MC |
2162 | /* only have one tmf outstanding at a time */ |
2163 | if (conn->tmf_state != TMF_INITIAL) | |
7996a778 | 2164 | goto failed; |
843c0a8a | 2165 | conn->tmf_state = TMF_QUEUED; |
7996a778 | 2166 | |
843c0a8a | 2167 | hdr = &conn->tmhdr; |
9c19a7d0 | 2168 | iscsi_prep_abort_task_pdu(task, hdr); |
843c0a8a | 2169 | |
9c19a7d0 | 2170 | if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout)) { |
843c0a8a MC |
2171 | rc = FAILED; |
2172 | goto failed; | |
2173 | } | |
2174 | ||
2175 | switch (conn->tmf_state) { | |
2176 | case TMF_SUCCESS: | |
77a23c21 | 2177 | spin_unlock_bh(&session->lock); |
913e5bf4 MC |
2178 | /* |
2179 | * stop tx side incase the target had sent a abort rsp but | |
2180 | * the initiator was still writing out data. | |
2181 | */ | |
6724add1 | 2182 | iscsi_suspend_tx(conn); |
77a23c21 | 2183 | /* |
913e5bf4 MC |
2184 | * we do not stop the recv side because targets have been |
2185 | * good and have never sent us a successful tmf response | |
2186 | * then sent more data for the cmd. | |
77a23c21 | 2187 | */ |
6187c242 | 2188 | spin_lock_bh(&session->lock); |
b3cd5050 | 2189 | fail_scsi_task(task, DID_ABORT); |
843c0a8a | 2190 | conn->tmf_state = TMF_INITIAL; |
5d12c05e | 2191 | memset(hdr, 0, sizeof(*hdr)); |
6187c242 | 2192 | spin_unlock_bh(&session->lock); |
6724add1 | 2193 | iscsi_start_tx(conn); |
77a23c21 | 2194 | goto success_unlocked; |
843c0a8a MC |
2195 | case TMF_TIMEDOUT: |
2196 | spin_unlock_bh(&session->lock); | |
df4da5cd | 2197 | iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); |
843c0a8a MC |
2198 | goto failed_unlocked; |
2199 | case TMF_NOT_FOUND: | |
2200 | if (!sc->SCp.ptr) { | |
2201 | conn->tmf_state = TMF_INITIAL; | |
5d12c05e | 2202 | memset(hdr, 0, sizeof(*hdr)); |
9c19a7d0 | 2203 | /* task completed before tmf abort response */ |
bd2199d4 EZ |
2204 | ISCSI_DBG_EH(session, "sc completed while abort in " |
2205 | "progress\n"); | |
77a23c21 | 2206 | goto success; |
7ea8b828 MC |
2207 | } |
2208 | /* fall through */ | |
2209 | default: | |
843c0a8a MC |
2210 | conn->tmf_state = TMF_INITIAL; |
2211 | goto failed; | |
7996a778 MC |
2212 | } |
2213 | ||
77a23c21 | 2214 | success: |
7996a778 | 2215 | spin_unlock_bh(&session->lock); |
77a23c21 | 2216 | success_unlocked: |
bd2199d4 EZ |
2217 | ISCSI_DBG_EH(session, "abort success [sc %p itt 0x%x]\n", |
2218 | sc, task->itt); | |
6724add1 | 2219 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
2220 | return SUCCESS; |
2221 | ||
2222 | failed: | |
2223 | spin_unlock_bh(&session->lock); | |
77a23c21 | 2224 | failed_unlocked: |
bd2199d4 EZ |
2225 | ISCSI_DBG_EH(session, "abort failed [sc %p itt 0x%x]\n", sc, |
2226 | task ? task->itt : 0); | |
6724add1 | 2227 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
2228 | return FAILED; |
2229 | } | |
2230 | EXPORT_SYMBOL_GPL(iscsi_eh_abort); | |
2231 | ||
843c0a8a MC |
2232 | static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr) |
2233 | { | |
2234 | memset(hdr, 0, sizeof(*hdr)); | |
2235 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
2236 | hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK; | |
2237 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
2238 | int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun); | |
f6d5180c | 2239 | hdr->rtt = RESERVED_ITT; |
843c0a8a MC |
2240 | } |
2241 | ||
2242 | int iscsi_eh_device_reset(struct scsi_cmnd *sc) | |
2243 | { | |
75613521 MC |
2244 | struct iscsi_cls_session *cls_session; |
2245 | struct iscsi_session *session; | |
843c0a8a MC |
2246 | struct iscsi_conn *conn; |
2247 | struct iscsi_tm *hdr; | |
2248 | int rc = FAILED; | |
2249 | ||
75613521 MC |
2250 | cls_session = starget_to_session(scsi_target(sc->device)); |
2251 | session = cls_session->dd_data; | |
2252 | ||
bd2199d4 | 2253 | ISCSI_DBG_EH(session, "LU Reset [sc %p lun %u]\n", sc, sc->device->lun); |
843c0a8a MC |
2254 | |
2255 | mutex_lock(&session->eh_mutex); | |
2256 | spin_lock_bh(&session->lock); | |
2257 | /* | |
2258 | * Just check if we are not logged in. We cannot check for | |
2259 | * the phase because the reset could come from a ioctl. | |
2260 | */ | |
2261 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN) | |
2262 | goto unlock; | |
2263 | conn = session->leadconn; | |
2264 | ||
2265 | /* only have one tmf outstanding at a time */ | |
2266 | if (conn->tmf_state != TMF_INITIAL) | |
2267 | goto unlock; | |
2268 | conn->tmf_state = TMF_QUEUED; | |
2269 | ||
2270 | hdr = &conn->tmhdr; | |
2271 | iscsi_prep_lun_reset_pdu(sc, hdr); | |
2272 | ||
9c19a7d0 | 2273 | if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age, |
f6d5180c | 2274 | session->lu_reset_timeout)) { |
843c0a8a MC |
2275 | rc = FAILED; |
2276 | goto unlock; | |
2277 | } | |
2278 | ||
2279 | switch (conn->tmf_state) { | |
2280 | case TMF_SUCCESS: | |
2281 | break; | |
2282 | case TMF_TIMEDOUT: | |
2283 | spin_unlock_bh(&session->lock); | |
df4da5cd | 2284 | iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); |
843c0a8a MC |
2285 | goto done; |
2286 | default: | |
2287 | conn->tmf_state = TMF_INITIAL; | |
2288 | goto unlock; | |
2289 | } | |
2290 | ||
2291 | rc = SUCCESS; | |
2292 | spin_unlock_bh(&session->lock); | |
2293 | ||
2294 | iscsi_suspend_tx(conn); | |
913e5bf4 | 2295 | |
a3439148 | 2296 | spin_lock_bh(&session->lock); |
5d12c05e | 2297 | memset(hdr, 0, sizeof(*hdr)); |
3bbaaad9 | 2298 | fail_scsi_tasks(conn, sc->device->lun, DID_ERROR); |
843c0a8a | 2299 | conn->tmf_state = TMF_INITIAL; |
a3439148 | 2300 | spin_unlock_bh(&session->lock); |
843c0a8a MC |
2301 | |
2302 | iscsi_start_tx(conn); | |
2303 | goto done; | |
2304 | ||
2305 | unlock: | |
2306 | spin_unlock_bh(&session->lock); | |
2307 | done: | |
bd2199d4 EZ |
2308 | ISCSI_DBG_EH(session, "dev reset result = %s\n", |
2309 | rc == SUCCESS ? "SUCCESS" : "FAILED"); | |
843c0a8a MC |
2310 | mutex_unlock(&session->eh_mutex); |
2311 | return rc; | |
2312 | } | |
2313 | EXPORT_SYMBOL_GPL(iscsi_eh_device_reset); | |
2314 | ||
3fe5ae8b MC |
2315 | void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session) |
2316 | { | |
2317 | struct iscsi_session *session = cls_session->dd_data; | |
2318 | ||
2319 | spin_lock_bh(&session->lock); | |
2320 | if (session->state != ISCSI_STATE_LOGGED_IN) { | |
2321 | session->state = ISCSI_STATE_RECOVERY_FAILED; | |
2322 | if (session->leadconn) | |
2323 | wake_up(&session->leadconn->ehwait); | |
2324 | } | |
2325 | spin_unlock_bh(&session->lock); | |
2326 | } | |
2327 | EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout); | |
2328 | ||
2329 | /** | |
2330 | * iscsi_eh_session_reset - drop session and attempt relogin | |
2331 | * @sc: scsi command | |
2332 | * | |
2333 | * This function will wait for a relogin, session termination from | |
2334 | * userspace, or a recovery/replacement timeout. | |
2335 | */ | |
309ce156 | 2336 | int iscsi_eh_session_reset(struct scsi_cmnd *sc) |
3fe5ae8b MC |
2337 | { |
2338 | struct iscsi_cls_session *cls_session; | |
2339 | struct iscsi_session *session; | |
2340 | struct iscsi_conn *conn; | |
2341 | ||
2342 | cls_session = starget_to_session(scsi_target(sc->device)); | |
2343 | session = cls_session->dd_data; | |
2344 | conn = session->leadconn; | |
2345 | ||
2346 | mutex_lock(&session->eh_mutex); | |
2347 | spin_lock_bh(&session->lock); | |
2348 | if (session->state == ISCSI_STATE_TERMINATE) { | |
2349 | failed: | |
2350 | ISCSI_DBG_EH(session, | |
2351 | "failing session reset: Could not log back into " | |
2352 | "%s, %s [age %d]\n", session->targetname, | |
2353 | conn->persistent_address, session->age); | |
2354 | spin_unlock_bh(&session->lock); | |
2355 | mutex_unlock(&session->eh_mutex); | |
2356 | return FAILED; | |
2357 | } | |
2358 | ||
2359 | spin_unlock_bh(&session->lock); | |
2360 | mutex_unlock(&session->eh_mutex); | |
2361 | /* | |
2362 | * we drop the lock here but the leadconn cannot be destoyed while | |
2363 | * we are in the scsi eh | |
2364 | */ | |
df4da5cd | 2365 | iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); |
3fe5ae8b MC |
2366 | |
2367 | ISCSI_DBG_EH(session, "wait for relogin\n"); | |
2368 | wait_event_interruptible(conn->ehwait, | |
2369 | session->state == ISCSI_STATE_TERMINATE || | |
2370 | session->state == ISCSI_STATE_LOGGED_IN || | |
2371 | session->state == ISCSI_STATE_RECOVERY_FAILED); | |
2372 | if (signal_pending(current)) | |
2373 | flush_signals(current); | |
2374 | ||
2375 | mutex_lock(&session->eh_mutex); | |
2376 | spin_lock_bh(&session->lock); | |
2377 | if (session->state == ISCSI_STATE_LOGGED_IN) { | |
2378 | ISCSI_DBG_EH(session, | |
2379 | "session reset succeeded for %s,%s\n", | |
2380 | session->targetname, conn->persistent_address); | |
2381 | } else | |
2382 | goto failed; | |
2383 | spin_unlock_bh(&session->lock); | |
2384 | mutex_unlock(&session->eh_mutex); | |
2385 | return SUCCESS; | |
2386 | } | |
309ce156 | 2387 | EXPORT_SYMBOL_GPL(iscsi_eh_session_reset); |
3fe5ae8b MC |
2388 | |
2389 | static void iscsi_prep_tgt_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr) | |
2390 | { | |
2391 | memset(hdr, 0, sizeof(*hdr)); | |
2392 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
2393 | hdr->flags = ISCSI_TM_FUNC_TARGET_WARM_RESET & ISCSI_FLAG_TM_FUNC_MASK; | |
2394 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
2395 | hdr->rtt = RESERVED_ITT; | |
2396 | } | |
2397 | ||
2398 | /** | |
2399 | * iscsi_eh_target_reset - reset target | |
2400 | * @sc: scsi command | |
2401 | * | |
309ce156 | 2402 | * This will attempt to send a warm target reset. |
3fe5ae8b MC |
2403 | */ |
2404 | int iscsi_eh_target_reset(struct scsi_cmnd *sc) | |
2405 | { | |
2406 | struct iscsi_cls_session *cls_session; | |
2407 | struct iscsi_session *session; | |
2408 | struct iscsi_conn *conn; | |
2409 | struct iscsi_tm *hdr; | |
2410 | int rc = FAILED; | |
2411 | ||
2412 | cls_session = starget_to_session(scsi_target(sc->device)); | |
2413 | session = cls_session->dd_data; | |
2414 | ||
2415 | ISCSI_DBG_EH(session, "tgt Reset [sc %p tgt %s]\n", sc, | |
2416 | session->targetname); | |
2417 | ||
2418 | mutex_lock(&session->eh_mutex); | |
2419 | spin_lock_bh(&session->lock); | |
2420 | /* | |
2421 | * Just check if we are not logged in. We cannot check for | |
2422 | * the phase because the reset could come from a ioctl. | |
2423 | */ | |
2424 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN) | |
2425 | goto unlock; | |
2426 | conn = session->leadconn; | |
2427 | ||
2428 | /* only have one tmf outstanding at a time */ | |
2429 | if (conn->tmf_state != TMF_INITIAL) | |
2430 | goto unlock; | |
2431 | conn->tmf_state = TMF_QUEUED; | |
2432 | ||
2433 | hdr = &conn->tmhdr; | |
2434 | iscsi_prep_tgt_reset_pdu(sc, hdr); | |
2435 | ||
2436 | if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age, | |
2437 | session->tgt_reset_timeout)) { | |
2438 | rc = FAILED; | |
2439 | goto unlock; | |
2440 | } | |
2441 | ||
2442 | switch (conn->tmf_state) { | |
2443 | case TMF_SUCCESS: | |
2444 | break; | |
2445 | case TMF_TIMEDOUT: | |
2446 | spin_unlock_bh(&session->lock); | |
df4da5cd | 2447 | iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); |
3fe5ae8b MC |
2448 | goto done; |
2449 | default: | |
2450 | conn->tmf_state = TMF_INITIAL; | |
2451 | goto unlock; | |
2452 | } | |
2453 | ||
2454 | rc = SUCCESS; | |
2455 | spin_unlock_bh(&session->lock); | |
2456 | ||
2457 | iscsi_suspend_tx(conn); | |
2458 | ||
2459 | spin_lock_bh(&session->lock); | |
2460 | memset(hdr, 0, sizeof(*hdr)); | |
2461 | fail_scsi_tasks(conn, -1, DID_ERROR); | |
2462 | conn->tmf_state = TMF_INITIAL; | |
2463 | spin_unlock_bh(&session->lock); | |
2464 | ||
2465 | iscsi_start_tx(conn); | |
2466 | goto done; | |
2467 | ||
2468 | unlock: | |
2469 | spin_unlock_bh(&session->lock); | |
2470 | done: | |
2471 | ISCSI_DBG_EH(session, "tgt %s reset result = %s\n", session->targetname, | |
2472 | rc == SUCCESS ? "SUCCESS" : "FAILED"); | |
2473 | mutex_unlock(&session->eh_mutex); | |
309ce156 JK |
2474 | return rc; |
2475 | } | |
2476 | EXPORT_SYMBOL_GPL(iscsi_eh_target_reset); | |
3fe5ae8b | 2477 | |
309ce156 JK |
2478 | /** |
2479 | * iscsi_eh_recover_target - reset target and possibly the session | |
2480 | * @sc: scsi command | |
2481 | * | |
2482 | * This will attempt to send a warm target reset. If that fails, | |
2483 | * we will escalate to ERL0 session recovery. | |
2484 | */ | |
2485 | int iscsi_eh_recover_target(struct scsi_cmnd *sc) | |
2486 | { | |
2487 | int rc; | |
2488 | ||
2489 | rc = iscsi_eh_target_reset(sc); | |
3fe5ae8b MC |
2490 | if (rc == FAILED) |
2491 | rc = iscsi_eh_session_reset(sc); | |
2492 | return rc; | |
2493 | } | |
309ce156 | 2494 | EXPORT_SYMBOL_GPL(iscsi_eh_recover_target); |
3fe5ae8b | 2495 | |
6320377f OK |
2496 | /* |
2497 | * Pre-allocate a pool of @max items of @item_size. By default, the pool | |
2498 | * should be accessed via kfifo_{get,put} on q->queue. | |
2499 | * Optionally, the caller can obtain the array of object pointers | |
2500 | * by passing in a non-NULL @items pointer | |
2501 | */ | |
7996a778 | 2502 | int |
6320377f | 2503 | iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size) |
7996a778 | 2504 | { |
6320377f | 2505 | int i, num_arrays = 1; |
7996a778 | 2506 | |
6320377f | 2507 | memset(q, 0, sizeof(*q)); |
7996a778 MC |
2508 | |
2509 | q->max = max; | |
6320377f OK |
2510 | |
2511 | /* If the user passed an items pointer, he wants a copy of | |
2512 | * the array. */ | |
2513 | if (items) | |
2514 | num_arrays++; | |
2515 | q->pool = kzalloc(num_arrays * max * sizeof(void*), GFP_KERNEL); | |
2516 | if (q->pool == NULL) | |
f474a37b | 2517 | return -ENOMEM; |
7996a778 | 2518 | |
c1e13f25 | 2519 | kfifo_init(&q->queue, (void*)q->pool, max * sizeof(void*)); |
7996a778 MC |
2520 | |
2521 | for (i = 0; i < max; i++) { | |
6320377f | 2522 | q->pool[i] = kzalloc(item_size, GFP_KERNEL); |
7996a778 | 2523 | if (q->pool[i] == NULL) { |
6320377f OK |
2524 | q->max = i; |
2525 | goto enomem; | |
7996a778 | 2526 | } |
7acd72eb | 2527 | kfifo_in(&q->queue, (void*)&q->pool[i], sizeof(void*)); |
7996a778 | 2528 | } |
6320377f OK |
2529 | |
2530 | if (items) { | |
2531 | *items = q->pool + max; | |
2532 | memcpy(*items, q->pool, max * sizeof(void *)); | |
2533 | } | |
2534 | ||
7996a778 | 2535 | return 0; |
6320377f OK |
2536 | |
2537 | enomem: | |
2538 | iscsi_pool_free(q); | |
2539 | return -ENOMEM; | |
7996a778 MC |
2540 | } |
2541 | EXPORT_SYMBOL_GPL(iscsi_pool_init); | |
2542 | ||
6320377f | 2543 | void iscsi_pool_free(struct iscsi_pool *q) |
7996a778 MC |
2544 | { |
2545 | int i; | |
2546 | ||
2547 | for (i = 0; i < q->max; i++) | |
6320377f | 2548 | kfree(q->pool[i]); |
f474a37b | 2549 | kfree(q->pool); |
7996a778 MC |
2550 | } |
2551 | EXPORT_SYMBOL_GPL(iscsi_pool_free); | |
2552 | ||
a4804cd6 MC |
2553 | /** |
2554 | * iscsi_host_add - add host to system | |
2555 | * @shost: scsi host | |
2556 | * @pdev: parent device | |
2557 | * | |
2558 | * This should be called by partial offload and software iscsi drivers | |
2559 | * to add a host to the system. | |
2560 | */ | |
2561 | int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev) | |
2562 | { | |
8e9a20ce MC |
2563 | if (!shost->can_queue) |
2564 | shost->can_queue = ISCSI_DEF_XMIT_CMDS_MAX; | |
2565 | ||
4d108350 MC |
2566 | if (!shost->cmd_per_lun) |
2567 | shost->cmd_per_lun = ISCSI_DEF_CMD_PER_LUN; | |
2568 | ||
308cec14 MC |
2569 | if (!shost->transportt->eh_timed_out) |
2570 | shost->transportt->eh_timed_out = iscsi_eh_cmd_timed_out; | |
a4804cd6 MC |
2571 | return scsi_add_host(shost, pdev); |
2572 | } | |
2573 | EXPORT_SYMBOL_GPL(iscsi_host_add); | |
2574 | ||
2575 | /** | |
2576 | * iscsi_host_alloc - allocate a host and driver data | |
2577 | * @sht: scsi host template | |
2578 | * @dd_data_size: driver host data size | |
32ae763e | 2579 | * @xmit_can_sleep: bool indicating if LLD will queue IO from a work queue |
a4804cd6 MC |
2580 | * |
2581 | * This should be called by partial offload and software iscsi drivers. | |
2582 | * To access the driver specific memory use the iscsi_host_priv() macro. | |
2583 | */ | |
2584 | struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht, | |
4d108350 | 2585 | int dd_data_size, bool xmit_can_sleep) |
75613521 | 2586 | { |
a4804cd6 | 2587 | struct Scsi_Host *shost; |
e5bd7b54 | 2588 | struct iscsi_host *ihost; |
a4804cd6 MC |
2589 | |
2590 | shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size); | |
2591 | if (!shost) | |
2592 | return NULL; | |
e5bd7b54 | 2593 | ihost = shost_priv(shost); |
32ae763e MC |
2594 | |
2595 | if (xmit_can_sleep) { | |
2596 | snprintf(ihost->workq_name, sizeof(ihost->workq_name), | |
2597 | "iscsi_q_%d", shost->host_no); | |
2598 | ihost->workq = create_singlethread_workqueue(ihost->workq_name); | |
2599 | if (!ihost->workq) | |
2600 | goto free_host; | |
2601 | } | |
2602 | ||
e5bd7b54 MC |
2603 | spin_lock_init(&ihost->lock); |
2604 | ihost->state = ISCSI_HOST_SETUP; | |
2605 | ihost->num_sessions = 0; | |
2606 | init_waitqueue_head(&ihost->session_removal_wq); | |
a4804cd6 | 2607 | return shost; |
32ae763e MC |
2608 | |
2609 | free_host: | |
2610 | scsi_host_put(shost); | |
2611 | return NULL; | |
a4804cd6 MC |
2612 | } |
2613 | EXPORT_SYMBOL_GPL(iscsi_host_alloc); | |
2614 | ||
e5bd7b54 MC |
2615 | static void iscsi_notify_host_removed(struct iscsi_cls_session *cls_session) |
2616 | { | |
40a06e75 | 2617 | iscsi_session_failure(cls_session->dd_data, ISCSI_ERR_INVALID_HOST); |
e5bd7b54 MC |
2618 | } |
2619 | ||
a4804cd6 MC |
2620 | /** |
2621 | * iscsi_host_remove - remove host and sessions | |
2622 | * @shost: scsi host | |
2623 | * | |
e5bd7b54 MC |
2624 | * If there are any sessions left, this will initiate the removal and wait |
2625 | * for the completion. | |
a4804cd6 MC |
2626 | */ |
2627 | void iscsi_host_remove(struct Scsi_Host *shost) | |
2628 | { | |
e5bd7b54 MC |
2629 | struct iscsi_host *ihost = shost_priv(shost); |
2630 | unsigned long flags; | |
2631 | ||
2632 | spin_lock_irqsave(&ihost->lock, flags); | |
2633 | ihost->state = ISCSI_HOST_REMOVED; | |
2634 | spin_unlock_irqrestore(&ihost->lock, flags); | |
2635 | ||
2636 | iscsi_host_for_each_session(shost, iscsi_notify_host_removed); | |
2637 | wait_event_interruptible(ihost->session_removal_wq, | |
2638 | ihost->num_sessions == 0); | |
2639 | if (signal_pending(current)) | |
2640 | flush_signals(current); | |
2641 | ||
a4804cd6 | 2642 | scsi_remove_host(shost); |
32ae763e MC |
2643 | if (ihost->workq) |
2644 | destroy_workqueue(ihost->workq); | |
75613521 | 2645 | } |
a4804cd6 | 2646 | EXPORT_SYMBOL_GPL(iscsi_host_remove); |
7996a778 | 2647 | |
a4804cd6 | 2648 | void iscsi_host_free(struct Scsi_Host *shost) |
75613521 MC |
2649 | { |
2650 | struct iscsi_host *ihost = shost_priv(shost); | |
7996a778 | 2651 | |
75613521 MC |
2652 | kfree(ihost->netdev); |
2653 | kfree(ihost->hwaddress); | |
2654 | kfree(ihost->initiatorname); | |
a4804cd6 | 2655 | scsi_host_put(shost); |
75613521 | 2656 | } |
a4804cd6 | 2657 | EXPORT_SYMBOL_GPL(iscsi_host_free); |
7996a778 | 2658 | |
e5bd7b54 MC |
2659 | static void iscsi_host_dec_session_cnt(struct Scsi_Host *shost) |
2660 | { | |
2661 | struct iscsi_host *ihost = shost_priv(shost); | |
2662 | unsigned long flags; | |
2663 | ||
2664 | shost = scsi_host_get(shost); | |
2665 | if (!shost) { | |
2666 | printk(KERN_ERR "Invalid state. Cannot notify host removal " | |
2667 | "of session teardown event because host already " | |
2668 | "removed.\n"); | |
2669 | return; | |
2670 | } | |
2671 | ||
2672 | spin_lock_irqsave(&ihost->lock, flags); | |
2673 | ihost->num_sessions--; | |
2674 | if (ihost->num_sessions == 0) | |
2675 | wake_up(&ihost->session_removal_wq); | |
2676 | spin_unlock_irqrestore(&ihost->lock, flags); | |
2677 | scsi_host_put(shost); | |
2678 | } | |
2679 | ||
7996a778 MC |
2680 | /** |
2681 | * iscsi_session_setup - create iscsi cls session and host and session | |
7996a778 | 2682 | * @iscsit: iscsi transport template |
75613521 MC |
2683 | * @shost: scsi host |
2684 | * @cmds_max: session can queue | |
9c19a7d0 | 2685 | * @cmd_task_size: LLD task private data size |
7996a778 | 2686 | * @initial_cmdsn: initial CmdSN |
7996a778 MC |
2687 | * |
2688 | * This can be used by software iscsi_transports that allocate | |
2689 | * a session per scsi host. | |
3cf7b233 MC |
2690 | * |
2691 | * Callers should set cmds_max to the largest total numer (mgmt + scsi) of | |
2692 | * tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks | |
2693 | * for nop handling and login/logout requests. | |
75613521 | 2694 | */ |
7996a778 | 2695 | struct iscsi_cls_session * |
75613521 | 2696 | iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost, |
b8b9e1b8 | 2697 | uint16_t cmds_max, int dd_size, int cmd_task_size, |
7970634b | 2698 | uint32_t initial_cmdsn, unsigned int id) |
7996a778 | 2699 | { |
e5bd7b54 | 2700 | struct iscsi_host *ihost = shost_priv(shost); |
7996a778 MC |
2701 | struct iscsi_session *session; |
2702 | struct iscsi_cls_session *cls_session; | |
3cf7b233 | 2703 | int cmd_i, scsi_cmds, total_cmds = cmds_max; |
e5bd7b54 MC |
2704 | unsigned long flags; |
2705 | ||
2706 | spin_lock_irqsave(&ihost->lock, flags); | |
2707 | if (ihost->state == ISCSI_HOST_REMOVED) { | |
2708 | spin_unlock_irqrestore(&ihost->lock, flags); | |
2709 | return NULL; | |
2710 | } | |
2711 | ihost->num_sessions++; | |
2712 | spin_unlock_irqrestore(&ihost->lock, flags); | |
8e9a20ce MC |
2713 | |
2714 | if (!total_cmds) | |
2715 | total_cmds = ISCSI_DEF_XMIT_CMDS_MAX; | |
3e5c28ad | 2716 | /* |
3cf7b233 MC |
2717 | * The iscsi layer needs some tasks for nop handling and tmfs, |
2718 | * so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX | |
2719 | * + 1 command for scsi IO. | |
3e5c28ad | 2720 | */ |
3cf7b233 MC |
2721 | if (total_cmds < ISCSI_TOTAL_CMDS_MIN) { |
2722 | printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " | |
2723 | "must be a power of two that is at least %d.\n", | |
2724 | total_cmds, ISCSI_TOTAL_CMDS_MIN); | |
e5bd7b54 | 2725 | goto dec_session_count; |
3cf7b233 MC |
2726 | } |
2727 | ||
2728 | if (total_cmds > ISCSI_TOTAL_CMDS_MAX) { | |
2729 | printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " | |
2730 | "must be a power of 2 less than or equal to %d.\n", | |
2731 | cmds_max, ISCSI_TOTAL_CMDS_MAX); | |
2732 | total_cmds = ISCSI_TOTAL_CMDS_MAX; | |
2733 | } | |
2734 | ||
2735 | if (!is_power_of_2(total_cmds)) { | |
2736 | printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " | |
2737 | "must be a power of 2.\n", total_cmds); | |
2738 | total_cmds = rounddown_pow_of_two(total_cmds); | |
2739 | if (total_cmds < ISCSI_TOTAL_CMDS_MIN) | |
2740 | return NULL; | |
2741 | printk(KERN_INFO "iscsi: Rounding can_queue to %d.\n", | |
2742 | total_cmds); | |
1548271e | 2743 | } |
3cf7b233 | 2744 | scsi_cmds = total_cmds - ISCSI_MGMT_CMDS_MAX; |
1548271e | 2745 | |
5d91e209 | 2746 | cls_session = iscsi_alloc_session(shost, iscsit, |
b8b9e1b8 JK |
2747 | sizeof(struct iscsi_session) + |
2748 | dd_size); | |
75613521 | 2749 | if (!cls_session) |
e5bd7b54 | 2750 | goto dec_session_count; |
75613521 MC |
2751 | session = cls_session->dd_data; |
2752 | session->cls_session = cls_session; | |
7996a778 MC |
2753 | session->host = shost; |
2754 | session->state = ISCSI_STATE_FREE; | |
f6d5180c | 2755 | session->fast_abort = 1; |
3fe5ae8b | 2756 | session->tgt_reset_timeout = 30; |
4cd49ea1 MC |
2757 | session->lu_reset_timeout = 15; |
2758 | session->abort_timeout = 10; | |
3cf7b233 MC |
2759 | session->scsi_cmds_max = scsi_cmds; |
2760 | session->cmds_max = total_cmds; | |
e0726407 | 2761 | session->queued_cmdsn = session->cmdsn = initial_cmdsn; |
7996a778 MC |
2762 | session->exp_cmdsn = initial_cmdsn + 1; |
2763 | session->max_cmdsn = initial_cmdsn + 1; | |
2764 | session->max_r2t = 1; | |
2765 | session->tt = iscsit; | |
b8b9e1b8 | 2766 | session->dd_data = cls_session->dd_data + sizeof(*session); |
6724add1 | 2767 | mutex_init(&session->eh_mutex); |
75613521 | 2768 | spin_lock_init(&session->lock); |
7996a778 MC |
2769 | |
2770 | /* initialize SCSI PDU commands pool */ | |
2771 | if (iscsi_pool_init(&session->cmdpool, session->cmds_max, | |
2772 | (void***)&session->cmds, | |
9c19a7d0 | 2773 | cmd_task_size + sizeof(struct iscsi_task))) |
7996a778 MC |
2774 | goto cmdpool_alloc_fail; |
2775 | ||
2776 | /* pre-format cmds pool with ITT */ | |
2777 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
9c19a7d0 | 2778 | struct iscsi_task *task = session->cmds[cmd_i]; |
7996a778 | 2779 | |
9c19a7d0 MC |
2780 | if (cmd_task_size) |
2781 | task->dd_data = &task[1]; | |
2782 | task->itt = cmd_i; | |
3bbaaad9 | 2783 | task->state = ISCSI_TASK_FREE; |
9c19a7d0 | 2784 | INIT_LIST_HEAD(&task->running); |
7996a778 MC |
2785 | } |
2786 | ||
f53a88da | 2787 | if (!try_module_get(iscsit->owner)) |
75613521 | 2788 | goto module_get_fail; |
7996a778 | 2789 | |
7970634b | 2790 | if (iscsi_add_session(cls_session, id)) |
75613521 | 2791 | goto cls_session_fail; |
e5bd7b54 | 2792 | |
7996a778 MC |
2793 | return cls_session; |
2794 | ||
2795 | cls_session_fail: | |
75613521 MC |
2796 | module_put(iscsit->owner); |
2797 | module_get_fail: | |
6320377f | 2798 | iscsi_pool_free(&session->cmdpool); |
7996a778 | 2799 | cmdpool_alloc_fail: |
75613521 | 2800 | iscsi_free_session(cls_session); |
e5bd7b54 MC |
2801 | dec_session_count: |
2802 | iscsi_host_dec_session_cnt(shost); | |
7996a778 MC |
2803 | return NULL; |
2804 | } | |
2805 | EXPORT_SYMBOL_GPL(iscsi_session_setup); | |
2806 | ||
2807 | /** | |
2808 | * iscsi_session_teardown - destroy session, host, and cls_session | |
75613521 | 2809 | * @cls_session: iscsi session |
7996a778 | 2810 | * |
75613521 MC |
2811 | * The driver must have called iscsi_remove_session before |
2812 | * calling this. | |
2813 | */ | |
7996a778 MC |
2814 | void iscsi_session_teardown(struct iscsi_cls_session *cls_session) |
2815 | { | |
75613521 | 2816 | struct iscsi_session *session = cls_session->dd_data; |
63f75cc8 | 2817 | struct module *owner = cls_session->transport->owner; |
e5bd7b54 | 2818 | struct Scsi_Host *shost = session->host; |
7996a778 | 2819 | |
6320377f | 2820 | iscsi_pool_free(&session->cmdpool); |
7996a778 | 2821 | |
b2c64167 MC |
2822 | kfree(session->password); |
2823 | kfree(session->password_in); | |
2824 | kfree(session->username); | |
2825 | kfree(session->username_in); | |
f3ff0c36 | 2826 | kfree(session->targetname); |
88dfd340 MC |
2827 | kfree(session->initiatorname); |
2828 | kfree(session->ifacename); | |
f3ff0c36 | 2829 | |
75613521 | 2830 | iscsi_destroy_session(cls_session); |
e5bd7b54 | 2831 | iscsi_host_dec_session_cnt(shost); |
63f75cc8 | 2832 | module_put(owner); |
7996a778 MC |
2833 | } |
2834 | EXPORT_SYMBOL_GPL(iscsi_session_teardown); | |
2835 | ||
2836 | /** | |
2837 | * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn | |
2838 | * @cls_session: iscsi_cls_session | |
5d91e209 | 2839 | * @dd_size: private driver data size |
7996a778 | 2840 | * @conn_idx: cid |
5d91e209 | 2841 | */ |
7996a778 | 2842 | struct iscsi_cls_conn * |
5d91e209 MC |
2843 | iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size, |
2844 | uint32_t conn_idx) | |
7996a778 | 2845 | { |
75613521 | 2846 | struct iscsi_session *session = cls_session->dd_data; |
7996a778 MC |
2847 | struct iscsi_conn *conn; |
2848 | struct iscsi_cls_conn *cls_conn; | |
d36ab6f3 | 2849 | char *data; |
7996a778 | 2850 | |
5d91e209 MC |
2851 | cls_conn = iscsi_create_conn(cls_session, sizeof(*conn) + dd_size, |
2852 | conn_idx); | |
7996a778 MC |
2853 | if (!cls_conn) |
2854 | return NULL; | |
2855 | conn = cls_conn->dd_data; | |
5d91e209 | 2856 | memset(conn, 0, sizeof(*conn) + dd_size); |
7996a778 | 2857 | |
5d91e209 | 2858 | conn->dd_data = cls_conn->dd_data + sizeof(*conn); |
7996a778 MC |
2859 | conn->session = session; |
2860 | conn->cls_conn = cls_conn; | |
2861 | conn->c_stage = ISCSI_CONN_INITIAL_STAGE; | |
2862 | conn->id = conn_idx; | |
2863 | conn->exp_statsn = 0; | |
843c0a8a | 2864 | conn->tmf_state = TMF_INITIAL; |
f6d5180c MC |
2865 | |
2866 | init_timer(&conn->transport_timer); | |
2867 | conn->transport_timer.data = (unsigned long)conn; | |
2868 | conn->transport_timer.function = iscsi_check_transport_timeouts; | |
2869 | ||
843c0a8a | 2870 | INIT_LIST_HEAD(&conn->mgmtqueue); |
3bbaaad9 | 2871 | INIT_LIST_HEAD(&conn->cmdqueue); |
843c0a8a | 2872 | INIT_LIST_HEAD(&conn->requeue); |
c4028958 | 2873 | INIT_WORK(&conn->xmitwork, iscsi_xmitworker); |
7996a778 | 2874 | |
9c19a7d0 | 2875 | /* allocate login_task used for the login/text sequences */ |
7996a778 | 2876 | spin_lock_bh(&session->lock); |
7acd72eb | 2877 | if (!kfifo_out(&session->cmdpool.queue, |
9c19a7d0 | 2878 | (void*)&conn->login_task, |
7996a778 MC |
2879 | sizeof(void*))) { |
2880 | spin_unlock_bh(&session->lock); | |
9c19a7d0 | 2881 | goto login_task_alloc_fail; |
7996a778 MC |
2882 | } |
2883 | spin_unlock_bh(&session->lock); | |
2884 | ||
cfeb2cf9 MC |
2885 | data = (char *) __get_free_pages(GFP_KERNEL, |
2886 | get_order(ISCSI_DEF_MAX_RECV_SEG_LEN)); | |
d36ab6f3 | 2887 | if (!data) |
9c19a7d0 MC |
2888 | goto login_task_data_alloc_fail; |
2889 | conn->login_task->data = conn->data = data; | |
d36ab6f3 | 2890 | |
843c0a8a | 2891 | init_timer(&conn->tmf_timer); |
7996a778 MC |
2892 | init_waitqueue_head(&conn->ehwait); |
2893 | ||
2894 | return cls_conn; | |
2895 | ||
9c19a7d0 | 2896 | login_task_data_alloc_fail: |
7acd72eb | 2897 | kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task, |
d36ab6f3 | 2898 | sizeof(void*)); |
9c19a7d0 | 2899 | login_task_alloc_fail: |
7996a778 MC |
2900 | iscsi_destroy_conn(cls_conn); |
2901 | return NULL; | |
2902 | } | |
2903 | EXPORT_SYMBOL_GPL(iscsi_conn_setup); | |
2904 | ||
2905 | /** | |
2906 | * iscsi_conn_teardown - teardown iscsi connection | |
2907 | * cls_conn: iscsi class connection | |
2908 | * | |
2909 | * TODO: we may need to make this into a two step process | |
2910 | * like scsi-mls remove + put host | |
2911 | */ | |
2912 | void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn) | |
2913 | { | |
2914 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2915 | struct iscsi_session *session = conn->session; | |
2916 | unsigned long flags; | |
2917 | ||
f6d5180c MC |
2918 | del_timer_sync(&conn->transport_timer); |
2919 | ||
7996a778 MC |
2920 | spin_lock_bh(&session->lock); |
2921 | conn->c_stage = ISCSI_CONN_CLEANUP_WAIT; | |
2922 | if (session->leadconn == conn) { | |
2923 | /* | |
2924 | * leading connection? then give up on recovery. | |
2925 | */ | |
2926 | session->state = ISCSI_STATE_TERMINATE; | |
2927 | wake_up(&conn->ehwait); | |
2928 | } | |
2929 | spin_unlock_bh(&session->lock); | |
2930 | ||
7996a778 MC |
2931 | /* |
2932 | * Block until all in-progress commands for this connection | |
2933 | * time out or fail. | |
2934 | */ | |
2935 | for (;;) { | |
2936 | spin_lock_irqsave(session->host->host_lock, flags); | |
2937 | if (!session->host->host_busy) { /* OK for ERL == 0 */ | |
2938 | spin_unlock_irqrestore(session->host->host_lock, flags); | |
2939 | break; | |
2940 | } | |
2941 | spin_unlock_irqrestore(session->host->host_lock, flags); | |
2942 | msleep_interruptible(500); | |
322d739d MC |
2943 | iscsi_conn_printk(KERN_INFO, conn, "iscsi conn_destroy(): " |
2944 | "host_busy %d host_failed %d\n", | |
2945 | session->host->host_busy, | |
2946 | session->host->host_failed); | |
7996a778 MC |
2947 | /* |
2948 | * force eh_abort() to unblock | |
2949 | */ | |
2950 | wake_up(&conn->ehwait); | |
2951 | } | |
2952 | ||
779ea120 | 2953 | /* flush queued up work because we free the connection below */ |
843c0a8a | 2954 | iscsi_suspend_tx(conn); |
779ea120 | 2955 | |
7996a778 | 2956 | spin_lock_bh(&session->lock); |
cfeb2cf9 MC |
2957 | free_pages((unsigned long) conn->data, |
2958 | get_order(ISCSI_DEF_MAX_RECV_SEG_LEN)); | |
f3ff0c36 | 2959 | kfree(conn->persistent_address); |
7acd72eb | 2960 | kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task, |
7996a778 | 2961 | sizeof(void*)); |
e0726407 | 2962 | if (session->leadconn == conn) |
7996a778 | 2963 | session->leadconn = NULL; |
7996a778 MC |
2964 | spin_unlock_bh(&session->lock); |
2965 | ||
7996a778 MC |
2966 | iscsi_destroy_conn(cls_conn); |
2967 | } | |
2968 | EXPORT_SYMBOL_GPL(iscsi_conn_teardown); | |
2969 | ||
2970 | int iscsi_conn_start(struct iscsi_cls_conn *cls_conn) | |
2971 | { | |
2972 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2973 | struct iscsi_session *session = conn->session; | |
2974 | ||
ffd0436e | 2975 | if (!session) { |
322d739d MC |
2976 | iscsi_conn_printk(KERN_ERR, conn, |
2977 | "can't start unbound connection\n"); | |
7996a778 MC |
2978 | return -EPERM; |
2979 | } | |
2980 | ||
db98ccde MC |
2981 | if ((session->imm_data_en || !session->initial_r2t_en) && |
2982 | session->first_burst > session->max_burst) { | |
322d739d MC |
2983 | iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: " |
2984 | "first_burst %d max_burst %d\n", | |
2985 | session->first_burst, session->max_burst); | |
ffd0436e MC |
2986 | return -EINVAL; |
2987 | } | |
2988 | ||
f6d5180c | 2989 | if (conn->ping_timeout && !conn->recv_timeout) { |
322d739d MC |
2990 | iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of " |
2991 | "zero. Using 5 seconds\n."); | |
f6d5180c MC |
2992 | conn->recv_timeout = 5; |
2993 | } | |
2994 | ||
2995 | if (conn->recv_timeout && !conn->ping_timeout) { | |
322d739d MC |
2996 | iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of " |
2997 | "zero. Using 5 seconds.\n"); | |
f6d5180c MC |
2998 | conn->ping_timeout = 5; |
2999 | } | |
3000 | ||
7996a778 MC |
3001 | spin_lock_bh(&session->lock); |
3002 | conn->c_stage = ISCSI_CONN_STARTED; | |
3003 | session->state = ISCSI_STATE_LOGGED_IN; | |
e0726407 | 3004 | session->queued_cmdsn = session->cmdsn; |
7996a778 | 3005 | |
f6d5180c MC |
3006 | conn->last_recv = jiffies; |
3007 | conn->last_ping = jiffies; | |
3008 | if (conn->recv_timeout && conn->ping_timeout) | |
3009 | mod_timer(&conn->transport_timer, | |
3010 | jiffies + (conn->recv_timeout * HZ)); | |
3011 | ||
7996a778 MC |
3012 | switch(conn->stop_stage) { |
3013 | case STOP_CONN_RECOVER: | |
3014 | /* | |
3015 | * unblock eh_abort() if it is blocked. re-try all | |
3016 | * commands after successful recovery | |
3017 | */ | |
7996a778 | 3018 | conn->stop_stage = 0; |
843c0a8a | 3019 | conn->tmf_state = TMF_INITIAL; |
7996a778 | 3020 | session->age++; |
8b1d0343 MC |
3021 | if (session->age == 16) |
3022 | session->age = 0; | |
6eabafbe | 3023 | break; |
7996a778 | 3024 | case STOP_CONN_TERM: |
7996a778 | 3025 | conn->stop_stage = 0; |
7996a778 MC |
3026 | break; |
3027 | default: | |
3028 | break; | |
3029 | } | |
3030 | spin_unlock_bh(&session->lock); | |
3031 | ||
75613521 | 3032 | iscsi_unblock_session(session->cls_session); |
6eabafbe | 3033 | wake_up(&conn->ehwait); |
7996a778 MC |
3034 | return 0; |
3035 | } | |
3036 | EXPORT_SYMBOL_GPL(iscsi_conn_start); | |
3037 | ||
3038 | static void | |
3bbaaad9 | 3039 | fail_mgmt_tasks(struct iscsi_session *session, struct iscsi_conn *conn) |
7996a778 | 3040 | { |
3bbaaad9 | 3041 | struct iscsi_task *task; |
b3cd5050 | 3042 | int i, state; |
7996a778 | 3043 | |
3bbaaad9 MC |
3044 | for (i = 0; i < conn->session->cmds_max; i++) { |
3045 | task = conn->session->cmds[i]; | |
3046 | if (task->sc) | |
3047 | continue; | |
7996a778 | 3048 | |
3bbaaad9 MC |
3049 | if (task->state == ISCSI_TASK_FREE) |
3050 | continue; | |
7996a778 | 3051 | |
3bbaaad9 MC |
3052 | ISCSI_DBG_SESSION(conn->session, |
3053 | "failing mgmt itt 0x%x state %d\n", | |
3054 | task->itt, task->state); | |
b3cd5050 MC |
3055 | state = ISCSI_TASK_ABRT_SESS_RECOV; |
3056 | if (task->state == ISCSI_TASK_PENDING) | |
3057 | state = ISCSI_TASK_COMPLETED; | |
3058 | iscsi_complete_task(task, state); | |
3059 | ||
3bbaaad9 | 3060 | } |
7996a778 MC |
3061 | } |
3062 | ||
656cffc9 MC |
3063 | static void iscsi_start_session_recovery(struct iscsi_session *session, |
3064 | struct iscsi_conn *conn, int flag) | |
7996a778 | 3065 | { |
ed2abc7f MC |
3066 | int old_stop_stage; |
3067 | ||
6724add1 | 3068 | mutex_lock(&session->eh_mutex); |
7996a778 | 3069 | spin_lock_bh(&session->lock); |
ed2abc7f | 3070 | if (conn->stop_stage == STOP_CONN_TERM) { |
7996a778 | 3071 | spin_unlock_bh(&session->lock); |
6724add1 MC |
3072 | mutex_unlock(&session->eh_mutex); |
3073 | return; | |
3074 | } | |
3075 | ||
ed2abc7f MC |
3076 | /* |
3077 | * When this is called for the in_login state, we only want to clean | |
9c19a7d0 | 3078 | * up the login task and connection. We do not need to block and set |
67a61114 | 3079 | * the recovery state again |
ed2abc7f | 3080 | */ |
67a61114 MC |
3081 | if (flag == STOP_CONN_TERM) |
3082 | session->state = ISCSI_STATE_TERMINATE; | |
3083 | else if (conn->stop_stage != STOP_CONN_RECOVER) | |
3084 | session->state = ISCSI_STATE_IN_RECOVERY; | |
4ae0a6c1 MC |
3085 | |
3086 | old_stop_stage = conn->stop_stage; | |
3087 | conn->stop_stage = flag; | |
26013ad4 | 3088 | spin_unlock_bh(&session->lock); |
ed2abc7f | 3089 | |
26013ad4 MC |
3090 | del_timer_sync(&conn->transport_timer); |
3091 | iscsi_suspend_tx(conn); | |
3092 | ||
3093 | spin_lock_bh(&session->lock); | |
67a61114 | 3094 | conn->c_stage = ISCSI_CONN_STOPPED; |
7996a778 | 3095 | spin_unlock_bh(&session->lock); |
6724add1 | 3096 | |
7996a778 MC |
3097 | /* |
3098 | * for connection level recovery we should not calculate | |
3099 | * header digest. conn->hdr_size used for optimization | |
3100 | * in hdr_extract() and will be re-negotiated at | |
3101 | * set_param() time. | |
3102 | */ | |
3103 | if (flag == STOP_CONN_RECOVER) { | |
3104 | conn->hdrdgst_en = 0; | |
3105 | conn->datadgst_en = 0; | |
656cffc9 | 3106 | if (session->state == ISCSI_STATE_IN_RECOVERY && |
67a61114 | 3107 | old_stop_stage != STOP_CONN_RECOVER) { |
1b2c7af8 | 3108 | ISCSI_DBG_SESSION(session, "blocking session\n"); |
75613521 | 3109 | iscsi_block_session(session->cls_session); |
67a61114 | 3110 | } |
7996a778 | 3111 | } |
656cffc9 | 3112 | |
656cffc9 MC |
3113 | /* |
3114 | * flush queues. | |
3115 | */ | |
3116 | spin_lock_bh(&session->lock); | |
b3cd5050 | 3117 | fail_scsi_tasks(conn, -1, DID_TRANSPORT_DISRUPTED); |
3bbaaad9 | 3118 | fail_mgmt_tasks(session, conn); |
5d12c05e | 3119 | memset(&conn->tmhdr, 0, sizeof(conn->tmhdr)); |
656cffc9 | 3120 | spin_unlock_bh(&session->lock); |
6724add1 | 3121 | mutex_unlock(&session->eh_mutex); |
7996a778 | 3122 | } |
7996a778 MC |
3123 | |
3124 | void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) | |
3125 | { | |
3126 | struct iscsi_conn *conn = cls_conn->dd_data; | |
3127 | struct iscsi_session *session = conn->session; | |
3128 | ||
3129 | switch (flag) { | |
3130 | case STOP_CONN_RECOVER: | |
3131 | case STOP_CONN_TERM: | |
3132 | iscsi_start_session_recovery(session, conn, flag); | |
8d2860b3 | 3133 | break; |
7996a778 | 3134 | default: |
322d739d MC |
3135 | iscsi_conn_printk(KERN_ERR, conn, |
3136 | "invalid stop flag %d\n", flag); | |
7996a778 MC |
3137 | } |
3138 | } | |
3139 | EXPORT_SYMBOL_GPL(iscsi_conn_stop); | |
3140 | ||
3141 | int iscsi_conn_bind(struct iscsi_cls_session *cls_session, | |
3142 | struct iscsi_cls_conn *cls_conn, int is_leading) | |
3143 | { | |
75613521 | 3144 | struct iscsi_session *session = cls_session->dd_data; |
98644047 | 3145 | struct iscsi_conn *conn = cls_conn->dd_data; |
7996a778 | 3146 | |
7996a778 | 3147 | spin_lock_bh(&session->lock); |
7996a778 MC |
3148 | if (is_leading) |
3149 | session->leadconn = conn; | |
98644047 | 3150 | spin_unlock_bh(&session->lock); |
7996a778 MC |
3151 | |
3152 | /* | |
3153 | * Unblock xmitworker(), Login Phase will pass through. | |
3154 | */ | |
3155 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
3156 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
3157 | return 0; | |
3158 | } | |
3159 | EXPORT_SYMBOL_GPL(iscsi_conn_bind); | |
3160 | ||
5700b1af MC |
3161 | static int iscsi_switch_str_param(char **param, char *new_val_buf) |
3162 | { | |
3163 | char *new_val; | |
3164 | ||
3165 | if (*param) { | |
3166 | if (!strcmp(*param, new_val_buf)) | |
3167 | return 0; | |
3168 | } | |
3169 | ||
3170 | new_val = kstrdup(new_val_buf, GFP_NOIO); | |
3171 | if (!new_val) | |
3172 | return -ENOMEM; | |
3173 | ||
3174 | kfree(*param); | |
3175 | *param = new_val; | |
3176 | return 0; | |
3177 | } | |
a54a52ca MC |
3178 | |
3179 | int iscsi_set_param(struct iscsi_cls_conn *cls_conn, | |
3180 | enum iscsi_param param, char *buf, int buflen) | |
3181 | { | |
3182 | struct iscsi_conn *conn = cls_conn->dd_data; | |
3183 | struct iscsi_session *session = conn->session; | |
3184 | uint32_t value; | |
3185 | ||
3186 | switch(param) { | |
843c0a8a MC |
3187 | case ISCSI_PARAM_FAST_ABORT: |
3188 | sscanf(buf, "%d", &session->fast_abort); | |
3189 | break; | |
f6d5180c MC |
3190 | case ISCSI_PARAM_ABORT_TMO: |
3191 | sscanf(buf, "%d", &session->abort_timeout); | |
3192 | break; | |
3193 | case ISCSI_PARAM_LU_RESET_TMO: | |
3194 | sscanf(buf, "%d", &session->lu_reset_timeout); | |
3195 | break; | |
3fe5ae8b MC |
3196 | case ISCSI_PARAM_TGT_RESET_TMO: |
3197 | sscanf(buf, "%d", &session->tgt_reset_timeout); | |
3198 | break; | |
f6d5180c MC |
3199 | case ISCSI_PARAM_PING_TMO: |
3200 | sscanf(buf, "%d", &conn->ping_timeout); | |
3201 | break; | |
3202 | case ISCSI_PARAM_RECV_TMO: | |
3203 | sscanf(buf, "%d", &conn->recv_timeout); | |
3204 | break; | |
a54a52ca MC |
3205 | case ISCSI_PARAM_MAX_RECV_DLENGTH: |
3206 | sscanf(buf, "%d", &conn->max_recv_dlength); | |
3207 | break; | |
3208 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
3209 | sscanf(buf, "%d", &conn->max_xmit_dlength); | |
3210 | break; | |
3211 | case ISCSI_PARAM_HDRDGST_EN: | |
3212 | sscanf(buf, "%d", &conn->hdrdgst_en); | |
3213 | break; | |
3214 | case ISCSI_PARAM_DATADGST_EN: | |
3215 | sscanf(buf, "%d", &conn->datadgst_en); | |
3216 | break; | |
3217 | case ISCSI_PARAM_INITIAL_R2T_EN: | |
3218 | sscanf(buf, "%d", &session->initial_r2t_en); | |
3219 | break; | |
3220 | case ISCSI_PARAM_MAX_R2T: | |
3221 | sscanf(buf, "%d", &session->max_r2t); | |
3222 | break; | |
3223 | case ISCSI_PARAM_IMM_DATA_EN: | |
3224 | sscanf(buf, "%d", &session->imm_data_en); | |
3225 | break; | |
3226 | case ISCSI_PARAM_FIRST_BURST: | |
3227 | sscanf(buf, "%d", &session->first_burst); | |
3228 | break; | |
3229 | case ISCSI_PARAM_MAX_BURST: | |
3230 | sscanf(buf, "%d", &session->max_burst); | |
3231 | break; | |
3232 | case ISCSI_PARAM_PDU_INORDER_EN: | |
3233 | sscanf(buf, "%d", &session->pdu_inorder_en); | |
3234 | break; | |
3235 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
3236 | sscanf(buf, "%d", &session->dataseq_inorder_en); | |
3237 | break; | |
3238 | case ISCSI_PARAM_ERL: | |
3239 | sscanf(buf, "%d", &session->erl); | |
3240 | break; | |
3241 | case ISCSI_PARAM_IFMARKER_EN: | |
3242 | sscanf(buf, "%d", &value); | |
3243 | BUG_ON(value); | |
3244 | break; | |
3245 | case ISCSI_PARAM_OFMARKER_EN: | |
3246 | sscanf(buf, "%d", &value); | |
3247 | BUG_ON(value); | |
3248 | break; | |
3249 | case ISCSI_PARAM_EXP_STATSN: | |
3250 | sscanf(buf, "%u", &conn->exp_statsn); | |
3251 | break; | |
b2c64167 | 3252 | case ISCSI_PARAM_USERNAME: |
5700b1af | 3253 | return iscsi_switch_str_param(&session->username, buf); |
b2c64167 | 3254 | case ISCSI_PARAM_USERNAME_IN: |
5700b1af | 3255 | return iscsi_switch_str_param(&session->username_in, buf); |
b2c64167 | 3256 | case ISCSI_PARAM_PASSWORD: |
5700b1af | 3257 | return iscsi_switch_str_param(&session->password, buf); |
b2c64167 | 3258 | case ISCSI_PARAM_PASSWORD_IN: |
5700b1af | 3259 | return iscsi_switch_str_param(&session->password_in, buf); |
a54a52ca | 3260 | case ISCSI_PARAM_TARGET_NAME: |
5700b1af | 3261 | return iscsi_switch_str_param(&session->targetname, buf); |
a54a52ca MC |
3262 | case ISCSI_PARAM_TPGT: |
3263 | sscanf(buf, "%d", &session->tpgt); | |
3264 | break; | |
3265 | case ISCSI_PARAM_PERSISTENT_PORT: | |
3266 | sscanf(buf, "%d", &conn->persistent_port); | |
3267 | break; | |
3268 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
5700b1af | 3269 | return iscsi_switch_str_param(&conn->persistent_address, buf); |
88dfd340 | 3270 | case ISCSI_PARAM_IFACE_NAME: |
5700b1af | 3271 | return iscsi_switch_str_param(&session->ifacename, buf); |
88dfd340 | 3272 | case ISCSI_PARAM_INITIATOR_NAME: |
5700b1af | 3273 | return iscsi_switch_str_param(&session->initiatorname, buf); |
a54a52ca MC |
3274 | default: |
3275 | return -ENOSYS; | |
3276 | } | |
3277 | ||
3278 | return 0; | |
3279 | } | |
3280 | EXPORT_SYMBOL_GPL(iscsi_set_param); | |
3281 | ||
3282 | int iscsi_session_get_param(struct iscsi_cls_session *cls_session, | |
3283 | enum iscsi_param param, char *buf) | |
3284 | { | |
75613521 | 3285 | struct iscsi_session *session = cls_session->dd_data; |
a54a52ca MC |
3286 | int len; |
3287 | ||
3288 | switch(param) { | |
843c0a8a MC |
3289 | case ISCSI_PARAM_FAST_ABORT: |
3290 | len = sprintf(buf, "%d\n", session->fast_abort); | |
3291 | break; | |
f6d5180c MC |
3292 | case ISCSI_PARAM_ABORT_TMO: |
3293 | len = sprintf(buf, "%d\n", session->abort_timeout); | |
3294 | break; | |
3295 | case ISCSI_PARAM_LU_RESET_TMO: | |
3296 | len = sprintf(buf, "%d\n", session->lu_reset_timeout); | |
3297 | break; | |
3fe5ae8b MC |
3298 | case ISCSI_PARAM_TGT_RESET_TMO: |
3299 | len = sprintf(buf, "%d\n", session->tgt_reset_timeout); | |
3300 | break; | |
a54a52ca MC |
3301 | case ISCSI_PARAM_INITIAL_R2T_EN: |
3302 | len = sprintf(buf, "%d\n", session->initial_r2t_en); | |
3303 | break; | |
3304 | case ISCSI_PARAM_MAX_R2T: | |
3305 | len = sprintf(buf, "%hu\n", session->max_r2t); | |
3306 | break; | |
3307 | case ISCSI_PARAM_IMM_DATA_EN: | |
3308 | len = sprintf(buf, "%d\n", session->imm_data_en); | |
3309 | break; | |
3310 | case ISCSI_PARAM_FIRST_BURST: | |
3311 | len = sprintf(buf, "%u\n", session->first_burst); | |
3312 | break; | |
3313 | case ISCSI_PARAM_MAX_BURST: | |
3314 | len = sprintf(buf, "%u\n", session->max_burst); | |
3315 | break; | |
3316 | case ISCSI_PARAM_PDU_INORDER_EN: | |
3317 | len = sprintf(buf, "%d\n", session->pdu_inorder_en); | |
3318 | break; | |
3319 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
3320 | len = sprintf(buf, "%d\n", session->dataseq_inorder_en); | |
3321 | break; | |
3322 | case ISCSI_PARAM_ERL: | |
3323 | len = sprintf(buf, "%d\n", session->erl); | |
3324 | break; | |
3325 | case ISCSI_PARAM_TARGET_NAME: | |
3326 | len = sprintf(buf, "%s\n", session->targetname); | |
3327 | break; | |
3328 | case ISCSI_PARAM_TPGT: | |
3329 | len = sprintf(buf, "%d\n", session->tpgt); | |
3330 | break; | |
b2c64167 MC |
3331 | case ISCSI_PARAM_USERNAME: |
3332 | len = sprintf(buf, "%s\n", session->username); | |
3333 | break; | |
3334 | case ISCSI_PARAM_USERNAME_IN: | |
3335 | len = sprintf(buf, "%s\n", session->username_in); | |
3336 | break; | |
3337 | case ISCSI_PARAM_PASSWORD: | |
3338 | len = sprintf(buf, "%s\n", session->password); | |
3339 | break; | |
3340 | case ISCSI_PARAM_PASSWORD_IN: | |
3341 | len = sprintf(buf, "%s\n", session->password_in); | |
3342 | break; | |
88dfd340 MC |
3343 | case ISCSI_PARAM_IFACE_NAME: |
3344 | len = sprintf(buf, "%s\n", session->ifacename); | |
3345 | break; | |
3346 | case ISCSI_PARAM_INITIATOR_NAME: | |
5700b1af | 3347 | len = sprintf(buf, "%s\n", session->initiatorname); |
88dfd340 | 3348 | break; |
a54a52ca MC |
3349 | default: |
3350 | return -ENOSYS; | |
3351 | } | |
3352 | ||
3353 | return len; | |
3354 | } | |
3355 | EXPORT_SYMBOL_GPL(iscsi_session_get_param); | |
3356 | ||
3357 | int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn, | |
3358 | enum iscsi_param param, char *buf) | |
3359 | { | |
3360 | struct iscsi_conn *conn = cls_conn->dd_data; | |
3361 | int len; | |
3362 | ||
3363 | switch(param) { | |
f6d5180c MC |
3364 | case ISCSI_PARAM_PING_TMO: |
3365 | len = sprintf(buf, "%u\n", conn->ping_timeout); | |
3366 | break; | |
3367 | case ISCSI_PARAM_RECV_TMO: | |
3368 | len = sprintf(buf, "%u\n", conn->recv_timeout); | |
3369 | break; | |
a54a52ca MC |
3370 | case ISCSI_PARAM_MAX_RECV_DLENGTH: |
3371 | len = sprintf(buf, "%u\n", conn->max_recv_dlength); | |
3372 | break; | |
3373 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
3374 | len = sprintf(buf, "%u\n", conn->max_xmit_dlength); | |
3375 | break; | |
3376 | case ISCSI_PARAM_HDRDGST_EN: | |
3377 | len = sprintf(buf, "%d\n", conn->hdrdgst_en); | |
3378 | break; | |
3379 | case ISCSI_PARAM_DATADGST_EN: | |
3380 | len = sprintf(buf, "%d\n", conn->datadgst_en); | |
3381 | break; | |
3382 | case ISCSI_PARAM_IFMARKER_EN: | |
3383 | len = sprintf(buf, "%d\n", conn->ifmarker_en); | |
3384 | break; | |
3385 | case ISCSI_PARAM_OFMARKER_EN: | |
3386 | len = sprintf(buf, "%d\n", conn->ofmarker_en); | |
3387 | break; | |
3388 | case ISCSI_PARAM_EXP_STATSN: | |
3389 | len = sprintf(buf, "%u\n", conn->exp_statsn); | |
3390 | break; | |
3391 | case ISCSI_PARAM_PERSISTENT_PORT: | |
3392 | len = sprintf(buf, "%d\n", conn->persistent_port); | |
3393 | break; | |
3394 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
3395 | len = sprintf(buf, "%s\n", conn->persistent_address); | |
3396 | break; | |
3397 | default: | |
3398 | return -ENOSYS; | |
3399 | } | |
3400 | ||
3401 | return len; | |
3402 | } | |
3403 | EXPORT_SYMBOL_GPL(iscsi_conn_get_param); | |
3404 | ||
0801c242 MC |
3405 | int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param, |
3406 | char *buf) | |
3407 | { | |
75613521 | 3408 | struct iscsi_host *ihost = shost_priv(shost); |
0801c242 MC |
3409 | int len; |
3410 | ||
3411 | switch (param) { | |
d8196ed2 | 3412 | case ISCSI_HOST_PARAM_NETDEV_NAME: |
5700b1af | 3413 | len = sprintf(buf, "%s\n", ihost->netdev); |
d8196ed2 | 3414 | break; |
0801c242 | 3415 | case ISCSI_HOST_PARAM_HWADDRESS: |
5700b1af | 3416 | len = sprintf(buf, "%s\n", ihost->hwaddress); |
0801c242 | 3417 | break; |
8ad5781a | 3418 | case ISCSI_HOST_PARAM_INITIATOR_NAME: |
5700b1af | 3419 | len = sprintf(buf, "%s\n", ihost->initiatorname); |
8ad5781a | 3420 | break; |
75613521 | 3421 | case ISCSI_HOST_PARAM_IPADDRESS: |
5700b1af | 3422 | len = sprintf(buf, "%s\n", ihost->local_address); |
88dfd340 | 3423 | break; |
0801c242 MC |
3424 | default: |
3425 | return -ENOSYS; | |
3426 | } | |
3427 | ||
3428 | return len; | |
3429 | } | |
3430 | EXPORT_SYMBOL_GPL(iscsi_host_get_param); | |
3431 | ||
3432 | int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param, | |
3433 | char *buf, int buflen) | |
3434 | { | |
75613521 | 3435 | struct iscsi_host *ihost = shost_priv(shost); |
0801c242 MC |
3436 | |
3437 | switch (param) { | |
d8196ed2 | 3438 | case ISCSI_HOST_PARAM_NETDEV_NAME: |
5700b1af | 3439 | return iscsi_switch_str_param(&ihost->netdev, buf); |
0801c242 | 3440 | case ISCSI_HOST_PARAM_HWADDRESS: |
5700b1af | 3441 | return iscsi_switch_str_param(&ihost->hwaddress, buf); |
8ad5781a | 3442 | case ISCSI_HOST_PARAM_INITIATOR_NAME: |
5700b1af | 3443 | return iscsi_switch_str_param(&ihost->initiatorname, buf); |
0801c242 MC |
3444 | default: |
3445 | return -ENOSYS; | |
3446 | } | |
3447 | ||
3448 | return 0; | |
3449 | } | |
3450 | EXPORT_SYMBOL_GPL(iscsi_host_set_param); | |
3451 | ||
7996a778 MC |
3452 | MODULE_AUTHOR("Mike Christie"); |
3453 | MODULE_DESCRIPTION("iSCSI library functions"); | |
3454 | MODULE_LICENSE("GPL"); |