Commit | Line | Data |
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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> |
8eb00539 | 28 | #include <asm/unaligned.h> |
7996a778 MC |
29 | #include <net/tcp.h> |
30 | #include <scsi/scsi_cmnd.h> | |
31 | #include <scsi/scsi_device.h> | |
32 | #include <scsi/scsi_eh.h> | |
33 | #include <scsi/scsi_tcq.h> | |
34 | #include <scsi/scsi_host.h> | |
35 | #include <scsi/scsi.h> | |
36 | #include <scsi/iscsi_proto.h> | |
37 | #include <scsi/scsi_transport.h> | |
38 | #include <scsi/scsi_transport_iscsi.h> | |
39 | #include <scsi/libiscsi.h> | |
40 | ||
1b2c7af8 MC |
41 | static int iscsi_dbg_lib; |
42 | module_param_named(debug_libiscsi, iscsi_dbg_lib, int, S_IRUGO | S_IWUSR); | |
43 | MODULE_PARM_DESC(debug_libiscsi, "Turn on debugging for libiscsi module. " | |
44 | "Set to 1 to turn on, and zero to turn off. Default " | |
45 | "is off."); | |
46 | ||
47 | #define ISCSI_DBG_CONN(_conn, dbg_fmt, arg...) \ | |
48 | do { \ | |
49 | if (iscsi_dbg_lib) \ | |
50 | iscsi_conn_printk(KERN_INFO, _conn, \ | |
51 | "%s " dbg_fmt, \ | |
52 | __func__, ##arg); \ | |
53 | } while (0); | |
54 | ||
55 | #define ISCSI_DBG_SESSION(_session, dbg_fmt, arg...) \ | |
56 | do { \ | |
57 | if (iscsi_dbg_lib) \ | |
58 | iscsi_session_printk(KERN_INFO, _session, \ | |
59 | "%s " dbg_fmt, \ | |
60 | __func__, ##arg); \ | |
61 | } while (0); | |
62 | ||
77a23c21 MC |
63 | /* Serial Number Arithmetic, 32 bits, less than, RFC1982 */ |
64 | #define SNA32_CHECK 2147483648UL | |
7996a778 | 65 | |
77a23c21 MC |
66 | static int iscsi_sna_lt(u32 n1, u32 n2) |
67 | { | |
68 | return n1 != n2 && ((n1 < n2 && (n2 - n1 < SNA32_CHECK)) || | |
69 | (n1 > n2 && (n2 - n1 < SNA32_CHECK))); | |
70 | } | |
71 | ||
72 | /* Serial Number Arithmetic, 32 bits, less than, RFC1982 */ | |
73 | static int iscsi_sna_lte(u32 n1, u32 n2) | |
74 | { | |
75 | return n1 == n2 || ((n1 < n2 && (n2 - n1 < SNA32_CHECK)) || | |
76 | (n1 > n2 && (n2 - n1 < SNA32_CHECK))); | |
77 | } | |
78 | ||
32ae763e MC |
79 | inline void iscsi_conn_queue_work(struct iscsi_conn *conn) |
80 | { | |
81 | struct Scsi_Host *shost = conn->session->host; | |
82 | struct iscsi_host *ihost = shost_priv(shost); | |
83 | ||
84 | queue_work(ihost->workq, &conn->xmitwork); | |
85 | } | |
86 | EXPORT_SYMBOL_GPL(iscsi_conn_queue_work); | |
87 | ||
77a23c21 MC |
88 | void |
89 | iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr) | |
7996a778 MC |
90 | { |
91 | uint32_t max_cmdsn = be32_to_cpu(hdr->max_cmdsn); | |
92 | uint32_t exp_cmdsn = be32_to_cpu(hdr->exp_cmdsn); | |
93 | ||
77a23c21 MC |
94 | /* |
95 | * standard specifies this check for when to update expected and | |
96 | * max sequence numbers | |
97 | */ | |
98 | if (iscsi_sna_lt(max_cmdsn, exp_cmdsn - 1)) | |
99 | return; | |
100 | ||
101 | if (exp_cmdsn != session->exp_cmdsn && | |
102 | !iscsi_sna_lt(exp_cmdsn, session->exp_cmdsn)) | |
7996a778 MC |
103 | session->exp_cmdsn = exp_cmdsn; |
104 | ||
77a23c21 MC |
105 | if (max_cmdsn != session->max_cmdsn && |
106 | !iscsi_sna_lt(max_cmdsn, session->max_cmdsn)) { | |
107 | session->max_cmdsn = max_cmdsn; | |
108 | /* | |
109 | * if the window closed with IO queued, then kick the | |
110 | * xmit thread | |
111 | */ | |
112 | if (!list_empty(&session->leadconn->xmitqueue) || | |
052d0144 MC |
113 | !list_empty(&session->leadconn->mgmtqueue)) { |
114 | if (!(session->tt->caps & CAP_DATA_PATH_OFFLOAD)) | |
32ae763e | 115 | iscsi_conn_queue_work(session->leadconn); |
052d0144 | 116 | } |
77a23c21 | 117 | } |
7996a778 | 118 | } |
77a23c21 | 119 | EXPORT_SYMBOL_GPL(iscsi_update_cmdsn); |
7996a778 | 120 | |
577577da MC |
121 | /** |
122 | * iscsi_prep_data_out_pdu - initialize Data-Out | |
123 | * @task: scsi command task | |
124 | * @r2t: R2T info | |
125 | * @hdr: iscsi data in pdu | |
126 | * | |
127 | * Notes: | |
128 | * Initialize Data-Out within this R2T sequence and finds | |
129 | * proper data_offset within this SCSI command. | |
130 | * | |
131 | * This function is called with connection lock taken. | |
132 | **/ | |
133 | void iscsi_prep_data_out_pdu(struct iscsi_task *task, struct iscsi_r2t_info *r2t, | |
134 | struct iscsi_data *hdr) | |
7996a778 | 135 | { |
9c19a7d0 | 136 | struct iscsi_conn *conn = task->conn; |
577577da MC |
137 | unsigned int left = r2t->data_length - r2t->sent; |
138 | ||
139 | task->hdr_len = sizeof(struct iscsi_data); | |
7996a778 MC |
140 | |
141 | memset(hdr, 0, sizeof(struct iscsi_data)); | |
577577da MC |
142 | hdr->ttt = r2t->ttt; |
143 | hdr->datasn = cpu_to_be32(r2t->datasn); | |
144 | r2t->datasn++; | |
7996a778 | 145 | hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; |
577577da MC |
146 | memcpy(hdr->lun, task->lun, sizeof(hdr->lun)); |
147 | hdr->itt = task->hdr_itt; | |
148 | hdr->exp_statsn = r2t->exp_statsn; | |
149 | hdr->offset = cpu_to_be32(r2t->data_offset + r2t->sent); | |
150 | if (left > conn->max_xmit_dlength) { | |
7996a778 | 151 | hton24(hdr->dlength, conn->max_xmit_dlength); |
577577da | 152 | r2t->data_count = conn->max_xmit_dlength; |
7996a778 MC |
153 | hdr->flags = 0; |
154 | } else { | |
577577da MC |
155 | hton24(hdr->dlength, left); |
156 | r2t->data_count = left; | |
7996a778 MC |
157 | hdr->flags = ISCSI_FLAG_CMD_FINAL; |
158 | } | |
577577da | 159 | conn->dataout_pdus_cnt++; |
7996a778 | 160 | } |
577577da | 161 | EXPORT_SYMBOL_GPL(iscsi_prep_data_out_pdu); |
7996a778 | 162 | |
9c19a7d0 | 163 | static int iscsi_add_hdr(struct iscsi_task *task, unsigned len) |
004d6530 | 164 | { |
9c19a7d0 | 165 | unsigned exp_len = task->hdr_len + len; |
004d6530 | 166 | |
9c19a7d0 | 167 | if (exp_len > task->hdr_max) { |
004d6530 BH |
168 | WARN_ON(1); |
169 | return -EINVAL; | |
170 | } | |
171 | ||
172 | WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */ | |
9c19a7d0 | 173 | task->hdr_len = exp_len; |
004d6530 BH |
174 | return 0; |
175 | } | |
176 | ||
38d1c069 BH |
177 | /* |
178 | * make an extended cdb AHS | |
179 | */ | |
9c19a7d0 | 180 | static int iscsi_prep_ecdb_ahs(struct iscsi_task *task) |
38d1c069 | 181 | { |
9c19a7d0 | 182 | struct scsi_cmnd *cmd = task->sc; |
38d1c069 BH |
183 | unsigned rlen, pad_len; |
184 | unsigned short ahslength; | |
185 | struct iscsi_ecdb_ahdr *ecdb_ahdr; | |
186 | int rc; | |
187 | ||
9c19a7d0 | 188 | ecdb_ahdr = iscsi_next_hdr(task); |
38d1c069 BH |
189 | rlen = cmd->cmd_len - ISCSI_CDB_SIZE; |
190 | ||
191 | BUG_ON(rlen > sizeof(ecdb_ahdr->ecdb)); | |
192 | ahslength = rlen + sizeof(ecdb_ahdr->reserved); | |
193 | ||
194 | pad_len = iscsi_padding(rlen); | |
195 | ||
9c19a7d0 | 196 | rc = iscsi_add_hdr(task, sizeof(ecdb_ahdr->ahslength) + |
38d1c069 BH |
197 | sizeof(ecdb_ahdr->ahstype) + ahslength + pad_len); |
198 | if (rc) | |
199 | return rc; | |
200 | ||
201 | if (pad_len) | |
202 | memset(&ecdb_ahdr->ecdb[rlen], 0, pad_len); | |
203 | ||
204 | ecdb_ahdr->ahslength = cpu_to_be16(ahslength); | |
205 | ecdb_ahdr->ahstype = ISCSI_AHSTYPE_CDB; | |
206 | ecdb_ahdr->reserved = 0; | |
207 | memcpy(ecdb_ahdr->ecdb, cmd->cmnd + ISCSI_CDB_SIZE, rlen); | |
208 | ||
1b2c7af8 MC |
209 | ISCSI_DBG_SESSION(task->conn->session, |
210 | "iscsi_prep_ecdb_ahs: varlen_cdb_len %d " | |
211 | "rlen %d pad_len %d ahs_length %d iscsi_headers_size " | |
212 | "%u\n", cmd->cmd_len, rlen, pad_len, ahslength, | |
213 | task->hdr_len); | |
38d1c069 BH |
214 | return 0; |
215 | } | |
216 | ||
9c19a7d0 | 217 | static int iscsi_prep_bidi_ahs(struct iscsi_task *task) |
c07d4444 | 218 | { |
9c19a7d0 | 219 | struct scsi_cmnd *sc = task->sc; |
c07d4444 BH |
220 | struct iscsi_rlength_ahdr *rlen_ahdr; |
221 | int rc; | |
222 | ||
9c19a7d0 MC |
223 | rlen_ahdr = iscsi_next_hdr(task); |
224 | rc = iscsi_add_hdr(task, sizeof(*rlen_ahdr)); | |
c07d4444 BH |
225 | if (rc) |
226 | return rc; | |
227 | ||
228 | rlen_ahdr->ahslength = | |
229 | cpu_to_be16(sizeof(rlen_ahdr->read_length) + | |
230 | sizeof(rlen_ahdr->reserved)); | |
231 | rlen_ahdr->ahstype = ISCSI_AHSTYPE_RLENGTH; | |
232 | rlen_ahdr->reserved = 0; | |
233 | rlen_ahdr->read_length = cpu_to_be32(scsi_in(sc)->length); | |
234 | ||
1b2c7af8 MC |
235 | ISCSI_DBG_SESSION(task->conn->session, |
236 | "bidi-in rlen_ahdr->read_length(%d) " | |
237 | "rlen_ahdr->ahslength(%d)\n", | |
238 | be32_to_cpu(rlen_ahdr->read_length), | |
239 | be16_to_cpu(rlen_ahdr->ahslength)); | |
c07d4444 BH |
240 | return 0; |
241 | } | |
242 | ||
7996a778 MC |
243 | /** |
244 | * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu | |
9c19a7d0 | 245 | * @task: iscsi task |
7996a778 MC |
246 | * |
247 | * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set | |
248 | * fields like dlength or final based on how much data it sends | |
249 | */ | |
9c19a7d0 | 250 | static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task) |
7996a778 | 251 | { |
9c19a7d0 | 252 | struct iscsi_conn *conn = task->conn; |
7996a778 | 253 | struct iscsi_session *session = conn->session; |
9c19a7d0 | 254 | struct scsi_cmnd *sc = task->sc; |
577577da | 255 | struct iscsi_cmd *hdr; |
38d1c069 | 256 | unsigned hdrlength, cmd_len; |
262ef636 | 257 | itt_t itt; |
004d6530 | 258 | int rc; |
7996a778 | 259 | |
184b57c6 MC |
260 | if (conn->session->tt->alloc_pdu) { |
261 | rc = conn->session->tt->alloc_pdu(task, ISCSI_OP_SCSI_CMD); | |
262 | if (rc) | |
263 | return rc; | |
264 | } | |
577577da | 265 | hdr = (struct iscsi_cmd *) task->hdr; |
262ef636 | 266 | itt = hdr->itt; |
577577da MC |
267 | memset(hdr, 0, sizeof(*hdr)); |
268 | ||
2ff79d52 MC |
269 | if (session->tt->parse_pdu_itt) |
270 | hdr->itt = task->hdr_itt = itt; | |
271 | else | |
272 | hdr->itt = task->hdr_itt = build_itt(task->itt, | |
273 | task->conn->session->age); | |
9c19a7d0 MC |
274 | task->hdr_len = 0; |
275 | rc = iscsi_add_hdr(task, sizeof(*hdr)); | |
004d6530 BH |
276 | if (rc) |
277 | return rc; | |
a8ac6311 OK |
278 | hdr->opcode = ISCSI_OP_SCSI_CMD; |
279 | hdr->flags = ISCSI_ATTR_SIMPLE; | |
280 | int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun); | |
577577da | 281 | memcpy(task->lun, hdr->lun, sizeof(task->lun)); |
577577da | 282 | hdr->cmdsn = task->cmdsn = cpu_to_be32(session->cmdsn); |
a8ac6311 OK |
283 | session->cmdsn++; |
284 | hdr->exp_statsn = cpu_to_be32(conn->exp_statsn); | |
38d1c069 BH |
285 | cmd_len = sc->cmd_len; |
286 | if (cmd_len < ISCSI_CDB_SIZE) | |
287 | memset(&hdr->cdb[cmd_len], 0, ISCSI_CDB_SIZE - cmd_len); | |
288 | else if (cmd_len > ISCSI_CDB_SIZE) { | |
9c19a7d0 | 289 | rc = iscsi_prep_ecdb_ahs(task); |
38d1c069 BH |
290 | if (rc) |
291 | return rc; | |
292 | cmd_len = ISCSI_CDB_SIZE; | |
293 | } | |
294 | memcpy(hdr->cdb, sc->cmnd, cmd_len); | |
7996a778 | 295 | |
9c19a7d0 | 296 | task->imm_count = 0; |
c07d4444 BH |
297 | if (scsi_bidi_cmnd(sc)) { |
298 | hdr->flags |= ISCSI_FLAG_CMD_READ; | |
9c19a7d0 | 299 | rc = iscsi_prep_bidi_ahs(task); |
c07d4444 BH |
300 | if (rc) |
301 | return rc; | |
302 | } | |
7996a778 | 303 | if (sc->sc_data_direction == DMA_TO_DEVICE) { |
c07d4444 | 304 | unsigned out_len = scsi_out(sc)->length; |
577577da MC |
305 | struct iscsi_r2t_info *r2t = &task->unsol_r2t; |
306 | ||
c07d4444 | 307 | hdr->data_length = cpu_to_be32(out_len); |
7996a778 MC |
308 | hdr->flags |= ISCSI_FLAG_CMD_WRITE; |
309 | /* | |
310 | * Write counters: | |
311 | * | |
312 | * imm_count bytes to be sent right after | |
313 | * SCSI PDU Header | |
314 | * | |
315 | * unsol_count bytes(as Data-Out) to be sent | |
316 | * without R2T ack right after | |
317 | * immediate data | |
318 | * | |
577577da | 319 | * r2t data_length bytes to be sent via R2T ack's |
7996a778 MC |
320 | * |
321 | * pad_count bytes to be sent as zero-padding | |
322 | */ | |
577577da | 323 | memset(r2t, 0, sizeof(*r2t)); |
7996a778 MC |
324 | |
325 | if (session->imm_data_en) { | |
c07d4444 | 326 | if (out_len >= session->first_burst) |
9c19a7d0 | 327 | task->imm_count = min(session->first_burst, |
7996a778 MC |
328 | conn->max_xmit_dlength); |
329 | else | |
9c19a7d0 | 330 | task->imm_count = min(out_len, |
7996a778 | 331 | conn->max_xmit_dlength); |
9c19a7d0 | 332 | hton24(hdr->dlength, task->imm_count); |
7996a778 | 333 | } else |
a8ac6311 | 334 | zero_data(hdr->dlength); |
7996a778 | 335 | |
ffd0436e | 336 | if (!session->initial_r2t_en) { |
577577da MC |
337 | r2t->data_length = min(session->first_burst, out_len) - |
338 | task->imm_count; | |
339 | r2t->data_offset = task->imm_count; | |
340 | r2t->ttt = cpu_to_be32(ISCSI_RESERVED_TAG); | |
341 | r2t->exp_statsn = cpu_to_be32(conn->exp_statsn); | |
ffd0436e MC |
342 | } |
343 | ||
577577da | 344 | if (!task->unsol_r2t.data_length) |
7996a778 | 345 | /* No unsolicit Data-Out's */ |
a8ac6311 | 346 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; |
7996a778 | 347 | } else { |
7996a778 MC |
348 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; |
349 | zero_data(hdr->dlength); | |
c07d4444 | 350 | hdr->data_length = cpu_to_be32(scsi_in(sc)->length); |
7996a778 MC |
351 | |
352 | if (sc->sc_data_direction == DMA_FROM_DEVICE) | |
353 | hdr->flags |= ISCSI_FLAG_CMD_READ; | |
354 | } | |
355 | ||
004d6530 | 356 | /* calculate size of additional header segments (AHSs) */ |
9c19a7d0 | 357 | hdrlength = task->hdr_len - sizeof(*hdr); |
004d6530 BH |
358 | |
359 | WARN_ON(hdrlength & (ISCSI_PAD_LEN-1)); | |
360 | hdrlength /= ISCSI_PAD_LEN; | |
361 | ||
362 | WARN_ON(hdrlength >= 256); | |
363 | hdr->hlength = hdrlength & 0xFF; | |
364 | ||
577577da | 365 | if (session->tt->init_task && session->tt->init_task(task)) |
052d0144 MC |
366 | return -EIO; |
367 | ||
9c19a7d0 MC |
368 | task->state = ISCSI_TASK_RUNNING; |
369 | list_move_tail(&task->running, &conn->run_list); | |
77a23c21 | 370 | |
a8ac6311 | 371 | conn->scsicmd_pdus_cnt++; |
1b2c7af8 MC |
372 | ISCSI_DBG_SESSION(session, "iscsi prep [%s cid %d sc %p cdb 0x%x " |
373 | "itt 0x%x len %d bidi_len %d cmdsn %d win %d]\n", | |
374 | scsi_bidi_cmnd(sc) ? "bidirectional" : | |
375 | sc->sc_data_direction == DMA_TO_DEVICE ? | |
376 | "write" : "read", conn->id, sc, sc->cmnd[0], | |
377 | task->itt, scsi_bufflen(sc), | |
378 | scsi_bidi_cmnd(sc) ? scsi_in(sc)->length : 0, | |
379 | session->cmdsn, | |
380 | session->max_cmdsn - session->exp_cmdsn + 1); | |
004d6530 | 381 | return 0; |
7996a778 | 382 | } |
7996a778 MC |
383 | |
384 | /** | |
3e5c28ad | 385 | * iscsi_complete_command - finish a task |
9c19a7d0 | 386 | * @task: iscsi cmd task |
7996a778 MC |
387 | * |
388 | * Must be called with session lock. | |
3e5c28ad MC |
389 | * This function returns the scsi command to scsi-ml or cleans |
390 | * up mgmt tasks then returns the task to the pool. | |
7996a778 | 391 | */ |
9c19a7d0 | 392 | static void iscsi_complete_command(struct iscsi_task *task) |
7996a778 | 393 | { |
9c19a7d0 | 394 | struct iscsi_conn *conn = task->conn; |
c1635cb7 | 395 | struct iscsi_session *session = conn->session; |
9c19a7d0 | 396 | struct scsi_cmnd *sc = task->sc; |
7996a778 | 397 | |
577577da | 398 | session->tt->cleanup_task(task); |
9c19a7d0 MC |
399 | list_del_init(&task->running); |
400 | task->state = ISCSI_TASK_COMPLETED; | |
401 | task->sc = NULL; | |
3e5c28ad | 402 | |
9c19a7d0 MC |
403 | if (conn->task == task) |
404 | conn->task = NULL; | |
3e5c28ad | 405 | /* |
9c19a7d0 | 406 | * login task is preallocated so do not free |
3e5c28ad | 407 | */ |
9c19a7d0 | 408 | if (conn->login_task == task) |
3e5c28ad MC |
409 | return; |
410 | ||
9c19a7d0 | 411 | __kfifo_put(session->cmdpool.queue, (void*)&task, sizeof(void*)); |
052d0144 | 412 | |
9c19a7d0 MC |
413 | if (conn->ping_task == task) |
414 | conn->ping_task = NULL; | |
3e5c28ad MC |
415 | |
416 | if (sc) { | |
9c19a7d0 | 417 | task->sc = NULL; |
3e5c28ad MC |
418 | /* SCSI eh reuses commands to verify us */ |
419 | sc->SCp.ptr = NULL; | |
420 | /* | |
421 | * queue command may call this to free the task, but | |
422 | * not have setup the sc callback | |
423 | */ | |
424 | if (sc->scsi_done) | |
425 | sc->scsi_done(sc); | |
426 | } | |
7996a778 MC |
427 | } |
428 | ||
913e5bf4 | 429 | void __iscsi_get_task(struct iscsi_task *task) |
60ecebf5 | 430 | { |
9c19a7d0 | 431 | atomic_inc(&task->refcount); |
60ecebf5 | 432 | } |
913e5bf4 | 433 | EXPORT_SYMBOL_GPL(__iscsi_get_task); |
60ecebf5 | 434 | |
9c19a7d0 | 435 | static void __iscsi_put_task(struct iscsi_task *task) |
60ecebf5 | 436 | { |
9c19a7d0 MC |
437 | if (atomic_dec_and_test(&task->refcount)) |
438 | iscsi_complete_command(task); | |
60ecebf5 MC |
439 | } |
440 | ||
9c19a7d0 | 441 | void iscsi_put_task(struct iscsi_task *task) |
3e5c28ad | 442 | { |
9c19a7d0 | 443 | struct iscsi_session *session = task->conn->session; |
3e5c28ad MC |
444 | |
445 | spin_lock_bh(&session->lock); | |
9c19a7d0 | 446 | __iscsi_put_task(task); |
3e5c28ad MC |
447 | spin_unlock_bh(&session->lock); |
448 | } | |
9c19a7d0 | 449 | EXPORT_SYMBOL_GPL(iscsi_put_task); |
3e5c28ad | 450 | |
b3a7ea8d MC |
451 | /* |
452 | * session lock must be held | |
453 | */ | |
9c19a7d0 | 454 | static void fail_command(struct iscsi_conn *conn, struct iscsi_task *task, |
b3a7ea8d MC |
455 | int err) |
456 | { | |
457 | struct scsi_cmnd *sc; | |
458 | ||
9c19a7d0 | 459 | sc = task->sc; |
b3a7ea8d MC |
460 | if (!sc) |
461 | return; | |
462 | ||
9c19a7d0 | 463 | if (task->state == ISCSI_TASK_PENDING) |
b3a7ea8d MC |
464 | /* |
465 | * cmd never made it to the xmit thread, so we should not count | |
466 | * the cmd in the sequencing | |
467 | */ | |
468 | conn->session->queued_cmdsn--; | |
b3a7ea8d MC |
469 | |
470 | sc->result = err; | |
c07d4444 BH |
471 | if (!scsi_bidi_cmnd(sc)) |
472 | scsi_set_resid(sc, scsi_bufflen(sc)); | |
473 | else { | |
474 | scsi_out(sc)->resid = scsi_out(sc)->length; | |
475 | scsi_in(sc)->resid = scsi_in(sc)->length; | |
476 | } | |
3e5c28ad | 477 | |
9c19a7d0 MC |
478 | if (conn->task == task) |
479 | conn->task = NULL; | |
b3a7ea8d | 480 | /* release ref from queuecommand */ |
9c19a7d0 | 481 | __iscsi_put_task(task); |
b3a7ea8d MC |
482 | } |
483 | ||
3e5c28ad | 484 | static int iscsi_prep_mgmt_task(struct iscsi_conn *conn, |
9c19a7d0 | 485 | struct iscsi_task *task) |
052d0144 MC |
486 | { |
487 | struct iscsi_session *session = conn->session; | |
577577da | 488 | struct iscsi_hdr *hdr = task->hdr; |
052d0144 MC |
489 | struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr; |
490 | ||
491 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) | |
492 | return -ENOTCONN; | |
493 | ||
494 | if (hdr->opcode != (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) && | |
495 | hdr->opcode != (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE)) | |
496 | nop->exp_statsn = cpu_to_be32(conn->exp_statsn); | |
497 | /* | |
498 | * pre-format CmdSN for outgoing PDU. | |
499 | */ | |
500 | nop->cmdsn = cpu_to_be32(session->cmdsn); | |
501 | if (hdr->itt != RESERVED_ITT) { | |
052d0144 MC |
502 | /* |
503 | * TODO: We always use immediate, so we never hit this. | |
504 | * If we start to send tmfs or nops as non-immediate then | |
505 | * we should start checking the cmdsn numbers for mgmt tasks. | |
506 | */ | |
507 | if (conn->c_stage == ISCSI_CONN_STARTED && | |
508 | !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { | |
509 | session->queued_cmdsn++; | |
510 | session->cmdsn++; | |
511 | } | |
512 | } | |
513 | ||
ae15f801 MC |
514 | if (session->tt->init_task && session->tt->init_task(task)) |
515 | return -EIO; | |
052d0144 MC |
516 | |
517 | if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT) | |
518 | session->state = ISCSI_STATE_LOGGING_OUT; | |
519 | ||
577577da | 520 | task->state = ISCSI_TASK_RUNNING; |
9c19a7d0 | 521 | list_move_tail(&task->running, &conn->mgmt_run_list); |
1b2c7af8 MC |
522 | ISCSI_DBG_SESSION(session, "mgmtpdu [op 0x%x hdr->itt 0x%x " |
523 | "datalen %d]\n", hdr->opcode & ISCSI_OPCODE_MASK, | |
524 | hdr->itt, task->data_count); | |
052d0144 MC |
525 | return 0; |
526 | } | |
527 | ||
9c19a7d0 | 528 | static struct iscsi_task * |
f6d5180c MC |
529 | __iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
530 | char *data, uint32_t data_size) | |
531 | { | |
532 | struct iscsi_session *session = conn->session; | |
9c19a7d0 | 533 | struct iscsi_task *task; |
262ef636 | 534 | itt_t itt; |
f6d5180c MC |
535 | |
536 | if (session->state == ISCSI_STATE_TERMINATE) | |
537 | return NULL; | |
538 | ||
539 | if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) || | |
540 | hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE)) | |
541 | /* | |
542 | * Login and Text are sent serially, in | |
543 | * request-followed-by-response sequence. | |
3e5c28ad MC |
544 | * Same task can be used. Same ITT must be used. |
545 | * Note that login_task is preallocated at conn_create(). | |
f6d5180c | 546 | */ |
9c19a7d0 | 547 | task = conn->login_task; |
f6d5180c | 548 | else { |
26013ad4 MC |
549 | if (session->state != ISCSI_STATE_LOGGED_IN) |
550 | return NULL; | |
551 | ||
f6d5180c MC |
552 | BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE); |
553 | BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED); | |
554 | ||
3e5c28ad | 555 | if (!__kfifo_get(session->cmdpool.queue, |
9c19a7d0 | 556 | (void*)&task, sizeof(void*))) |
f6d5180c MC |
557 | return NULL; |
558 | } | |
3e5c28ad MC |
559 | /* |
560 | * released in complete pdu for task we expect a response for, and | |
561 | * released by the lld when it has transmitted the task for | |
562 | * pdus we do not expect a response for. | |
563 | */ | |
9c19a7d0 MC |
564 | atomic_set(&task->refcount, 1); |
565 | task->conn = conn; | |
566 | task->sc = NULL; | |
f6d5180c MC |
567 | |
568 | if (data_size) { | |
9c19a7d0 MC |
569 | memcpy(task->data, data, data_size); |
570 | task->data_count = data_size; | |
f6d5180c | 571 | } else |
9c19a7d0 | 572 | task->data_count = 0; |
f6d5180c | 573 | |
184b57c6 MC |
574 | if (conn->session->tt->alloc_pdu) { |
575 | if (conn->session->tt->alloc_pdu(task, hdr->opcode)) { | |
576 | iscsi_conn_printk(KERN_ERR, conn, "Could not allocate " | |
577 | "pdu for mgmt task.\n"); | |
578 | goto requeue_task; | |
579 | } | |
577577da | 580 | } |
184b57c6 | 581 | |
262ef636 | 582 | itt = task->hdr->itt; |
577577da | 583 | task->hdr_len = sizeof(struct iscsi_hdr); |
9c19a7d0 | 584 | memcpy(task->hdr, hdr, sizeof(struct iscsi_hdr)); |
262ef636 MC |
585 | |
586 | if (hdr->itt != RESERVED_ITT) { | |
587 | if (session->tt->parse_pdu_itt) | |
588 | task->hdr->itt = itt; | |
589 | else | |
590 | task->hdr->itt = build_itt(task->itt, | |
591 | task->conn->session->age); | |
592 | } | |
593 | ||
9c19a7d0 MC |
594 | INIT_LIST_HEAD(&task->running); |
595 | list_add_tail(&task->running, &conn->mgmtqueue); | |
052d0144 MC |
596 | |
597 | if (session->tt->caps & CAP_DATA_PATH_OFFLOAD) { | |
577577da MC |
598 | if (iscsi_prep_mgmt_task(conn, task)) |
599 | goto free_task; | |
052d0144 | 600 | |
9c19a7d0 | 601 | if (session->tt->xmit_task(task)) |
577577da | 602 | goto free_task; |
052d0144 MC |
603 | |
604 | } else | |
32ae763e | 605 | iscsi_conn_queue_work(conn); |
052d0144 | 606 | |
9c19a7d0 | 607 | return task; |
577577da MC |
608 | |
609 | free_task: | |
610 | __iscsi_put_task(task); | |
611 | return NULL; | |
612 | ||
613 | requeue_task: | |
614 | if (task != conn->login_task) | |
615 | __kfifo_put(session->cmdpool.queue, (void*)&task, | |
616 | sizeof(void*)); | |
617 | return NULL; | |
f6d5180c MC |
618 | } |
619 | ||
620 | int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr, | |
621 | char *data, uint32_t data_size) | |
622 | { | |
623 | struct iscsi_conn *conn = cls_conn->dd_data; | |
624 | struct iscsi_session *session = conn->session; | |
625 | int err = 0; | |
626 | ||
627 | spin_lock_bh(&session->lock); | |
628 | if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size)) | |
629 | err = -EPERM; | |
630 | spin_unlock_bh(&session->lock); | |
f6d5180c MC |
631 | return err; |
632 | } | |
633 | EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu); | |
634 | ||
7996a778 MC |
635 | /** |
636 | * iscsi_cmd_rsp - SCSI Command Response processing | |
637 | * @conn: iscsi connection | |
638 | * @hdr: iscsi header | |
9c19a7d0 | 639 | * @task: scsi command task |
7996a778 MC |
640 | * @data: cmd data buffer |
641 | * @datalen: len of buffer | |
642 | * | |
643 | * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and | |
9c19a7d0 | 644 | * then completes the command and task. |
7996a778 | 645 | **/ |
77a23c21 | 646 | static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
9c19a7d0 | 647 | struct iscsi_task *task, char *data, |
77a23c21 | 648 | int datalen) |
7996a778 | 649 | { |
7996a778 MC |
650 | struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)hdr; |
651 | struct iscsi_session *session = conn->session; | |
9c19a7d0 | 652 | struct scsi_cmnd *sc = task->sc; |
7996a778 | 653 | |
77a23c21 | 654 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr); |
7996a778 MC |
655 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; |
656 | ||
657 | sc->result = (DID_OK << 16) | rhdr->cmd_status; | |
658 | ||
659 | if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) { | |
660 | sc->result = DID_ERROR << 16; | |
661 | goto out; | |
662 | } | |
663 | ||
664 | if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) { | |
9b80cb4b | 665 | uint16_t senselen; |
7996a778 MC |
666 | |
667 | if (datalen < 2) { | |
668 | invalid_datalen: | |
322d739d MC |
669 | iscsi_conn_printk(KERN_ERR, conn, |
670 | "Got CHECK_CONDITION but invalid data " | |
671 | "buffer size of %d\n", datalen); | |
7996a778 MC |
672 | sc->result = DID_BAD_TARGET << 16; |
673 | goto out; | |
674 | } | |
675 | ||
8f333991 | 676 | senselen = get_unaligned_be16(data); |
7996a778 MC |
677 | if (datalen < senselen) |
678 | goto invalid_datalen; | |
679 | ||
680 | memcpy(sc->sense_buffer, data + 2, | |
9b80cb4b | 681 | min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE)); |
1b2c7af8 MC |
682 | ISCSI_DBG_SESSION(session, "copied %d bytes of sense\n", |
683 | min_t(uint16_t, senselen, | |
684 | SCSI_SENSE_BUFFERSIZE)); | |
7996a778 MC |
685 | } |
686 | ||
c07d4444 BH |
687 | if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW | |
688 | ISCSI_FLAG_CMD_BIDI_OVERFLOW)) { | |
689 | int res_count = be32_to_cpu(rhdr->bi_residual_count); | |
690 | ||
691 | if (scsi_bidi_cmnd(sc) && res_count > 0 && | |
692 | (rhdr->flags & ISCSI_FLAG_CMD_BIDI_OVERFLOW || | |
693 | res_count <= scsi_in(sc)->length)) | |
694 | scsi_in(sc)->resid = res_count; | |
695 | else | |
696 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
697 | } | |
698 | ||
7207fea4 BH |
699 | if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW | |
700 | ISCSI_FLAG_CMD_OVERFLOW)) { | |
7996a778 MC |
701 | int res_count = be32_to_cpu(rhdr->residual_count); |
702 | ||
7207fea4 BH |
703 | if (res_count > 0 && |
704 | (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || | |
705 | res_count <= scsi_bufflen(sc))) | |
c07d4444 | 706 | /* write side for bidi or uni-io set_resid */ |
1c138991 | 707 | scsi_set_resid(sc, res_count); |
7996a778 MC |
708 | else |
709 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
c07d4444 | 710 | } |
7996a778 | 711 | out: |
1b2c7af8 MC |
712 | ISCSI_DBG_SESSION(session, "done [sc %p res %d itt 0x%x]\n", |
713 | sc, sc->result, task->itt); | |
7996a778 MC |
714 | conn->scsirsp_pdus_cnt++; |
715 | ||
9c19a7d0 | 716 | __iscsi_put_task(task); |
7996a778 MC |
717 | } |
718 | ||
1d9edf02 MC |
719 | /** |
720 | * iscsi_data_in_rsp - SCSI Data-In Response processing | |
721 | * @conn: iscsi connection | |
722 | * @hdr: iscsi pdu | |
723 | * @task: scsi command task | |
724 | **/ | |
725 | static void | |
726 | iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
727 | struct iscsi_task *task) | |
728 | { | |
729 | struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)hdr; | |
730 | struct scsi_cmnd *sc = task->sc; | |
731 | ||
732 | if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS)) | |
733 | return; | |
734 | ||
edbc9aa0 | 735 | iscsi_update_cmdsn(conn->session, (struct iscsi_nopin *)hdr); |
1d9edf02 MC |
736 | sc->result = (DID_OK << 16) | rhdr->cmd_status; |
737 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; | |
738 | if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW | | |
739 | ISCSI_FLAG_DATA_OVERFLOW)) { | |
740 | int res_count = be32_to_cpu(rhdr->residual_count); | |
741 | ||
742 | if (res_count > 0 && | |
743 | (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || | |
744 | res_count <= scsi_in(sc)->length)) | |
745 | scsi_in(sc)->resid = res_count; | |
746 | else | |
747 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
748 | } | |
749 | ||
750 | conn->scsirsp_pdus_cnt++; | |
751 | __iscsi_put_task(task); | |
752 | } | |
753 | ||
7ea8b828 MC |
754 | static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr) |
755 | { | |
756 | struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr; | |
757 | ||
758 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
759 | conn->tmfrsp_pdus_cnt++; | |
760 | ||
843c0a8a | 761 | if (conn->tmf_state != TMF_QUEUED) |
7ea8b828 MC |
762 | return; |
763 | ||
764 | if (tmf->response == ISCSI_TMF_RSP_COMPLETE) | |
843c0a8a | 765 | conn->tmf_state = TMF_SUCCESS; |
7ea8b828 | 766 | else if (tmf->response == ISCSI_TMF_RSP_NO_TASK) |
843c0a8a | 767 | conn->tmf_state = TMF_NOT_FOUND; |
7ea8b828 | 768 | else |
843c0a8a | 769 | conn->tmf_state = TMF_FAILED; |
7ea8b828 MC |
770 | wake_up(&conn->ehwait); |
771 | } | |
772 | ||
f6d5180c MC |
773 | static void iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr) |
774 | { | |
775 | struct iscsi_nopout hdr; | |
9c19a7d0 | 776 | struct iscsi_task *task; |
f6d5180c | 777 | |
9c19a7d0 | 778 | if (!rhdr && conn->ping_task) |
f6d5180c MC |
779 | return; |
780 | ||
781 | memset(&hdr, 0, sizeof(struct iscsi_nopout)); | |
782 | hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE; | |
783 | hdr.flags = ISCSI_FLAG_CMD_FINAL; | |
784 | ||
785 | if (rhdr) { | |
786 | memcpy(hdr.lun, rhdr->lun, 8); | |
787 | hdr.ttt = rhdr->ttt; | |
788 | hdr.itt = RESERVED_ITT; | |
789 | } else | |
790 | hdr.ttt = RESERVED_ITT; | |
791 | ||
9c19a7d0 MC |
792 | task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0); |
793 | if (!task) | |
322d739d | 794 | iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n"); |
d3acf022 MC |
795 | else if (!rhdr) { |
796 | /* only track our nops */ | |
797 | conn->ping_task = task; | |
798 | conn->last_ping = jiffies; | |
799 | } | |
f6d5180c MC |
800 | } |
801 | ||
62f38300 MC |
802 | static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
803 | char *data, int datalen) | |
804 | { | |
805 | struct iscsi_reject *reject = (struct iscsi_reject *)hdr; | |
806 | struct iscsi_hdr rejected_pdu; | |
62f38300 MC |
807 | |
808 | conn->exp_statsn = be32_to_cpu(reject->statsn) + 1; | |
809 | ||
810 | if (reject->reason == ISCSI_REASON_DATA_DIGEST_ERROR) { | |
811 | if (ntoh24(reject->dlength) > datalen) | |
812 | return ISCSI_ERR_PROTO; | |
813 | ||
814 | if (ntoh24(reject->dlength) >= sizeof(struct iscsi_hdr)) { | |
815 | memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr)); | |
322d739d | 816 | iscsi_conn_printk(KERN_ERR, conn, |
262ef636 MC |
817 | "pdu (op 0x%x) rejected " |
818 | "due to DataDigest error.\n", | |
322d739d | 819 | rejected_pdu.opcode); |
62f38300 MC |
820 | } |
821 | } | |
822 | return 0; | |
823 | } | |
824 | ||
913e5bf4 MC |
825 | /** |
826 | * iscsi_itt_to_task - look up task by itt | |
827 | * @conn: iscsi connection | |
828 | * @itt: itt | |
829 | * | |
830 | * This should be used for mgmt tasks like login and nops, or if | |
831 | * the LDD's itt space does not include the session age. | |
832 | * | |
833 | * The session lock must be held. | |
834 | */ | |
8f9256ce | 835 | struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *conn, itt_t itt) |
913e5bf4 MC |
836 | { |
837 | struct iscsi_session *session = conn->session; | |
262ef636 | 838 | int i; |
913e5bf4 MC |
839 | |
840 | if (itt == RESERVED_ITT) | |
841 | return NULL; | |
842 | ||
262ef636 MC |
843 | if (session->tt->parse_pdu_itt) |
844 | session->tt->parse_pdu_itt(conn, itt, &i, NULL); | |
845 | else | |
846 | i = get_itt(itt); | |
913e5bf4 MC |
847 | if (i >= session->cmds_max) |
848 | return NULL; | |
849 | ||
850 | return session->cmds[i]; | |
851 | } | |
8f9256ce | 852 | EXPORT_SYMBOL_GPL(iscsi_itt_to_task); |
913e5bf4 | 853 | |
7996a778 MC |
854 | /** |
855 | * __iscsi_complete_pdu - complete pdu | |
856 | * @conn: iscsi conn | |
857 | * @hdr: iscsi header | |
858 | * @data: data buffer | |
859 | * @datalen: len of data buffer | |
860 | * | |
861 | * Completes pdu processing by freeing any resources allocated at | |
862 | * queuecommand or send generic. session lock must be held and verify | |
863 | * itt must have been called. | |
864 | */ | |
913e5bf4 MC |
865 | int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
866 | char *data, int datalen) | |
7996a778 MC |
867 | { |
868 | struct iscsi_session *session = conn->session; | |
869 | int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0; | |
9c19a7d0 | 870 | struct iscsi_task *task; |
7996a778 MC |
871 | uint32_t itt; |
872 | ||
f6d5180c | 873 | conn->last_recv = jiffies; |
0af967f5 MC |
874 | rc = iscsi_verify_itt(conn, hdr->itt); |
875 | if (rc) | |
876 | return rc; | |
877 | ||
b4377356 AV |
878 | if (hdr->itt != RESERVED_ITT) |
879 | itt = get_itt(hdr->itt); | |
7996a778 | 880 | else |
b4377356 | 881 | itt = ~0U; |
7996a778 | 882 | |
1b2c7af8 MC |
883 | ISCSI_DBG_SESSION(session, "[op 0x%x cid %d itt 0x%x len %d]\n", |
884 | opcode, conn->id, itt, datalen); | |
7996a778 | 885 | |
3e5c28ad | 886 | if (itt == ~0U) { |
77a23c21 | 887 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); |
62f38300 | 888 | |
7996a778 MC |
889 | switch(opcode) { |
890 | case ISCSI_OP_NOOP_IN: | |
40527afe | 891 | if (datalen) { |
7996a778 | 892 | rc = ISCSI_ERR_PROTO; |
40527afe MC |
893 | break; |
894 | } | |
895 | ||
b4377356 | 896 | if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG)) |
40527afe MC |
897 | break; |
898 | ||
f6d5180c | 899 | iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr); |
7996a778 MC |
900 | break; |
901 | case ISCSI_OP_REJECT: | |
62f38300 MC |
902 | rc = iscsi_handle_reject(conn, hdr, data, datalen); |
903 | break; | |
7996a778 | 904 | case ISCSI_OP_ASYNC_EVENT: |
8d2860b3 | 905 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; |
5831c737 MC |
906 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) |
907 | rc = ISCSI_ERR_CONN_FAILED; | |
7996a778 MC |
908 | break; |
909 | default: | |
910 | rc = ISCSI_ERR_BAD_OPCODE; | |
911 | break; | |
912 | } | |
3e5c28ad MC |
913 | goto out; |
914 | } | |
915 | ||
3e5c28ad MC |
916 | switch(opcode) { |
917 | case ISCSI_OP_SCSI_CMD_RSP: | |
913e5bf4 MC |
918 | case ISCSI_OP_SCSI_DATA_IN: |
919 | task = iscsi_itt_to_ctask(conn, hdr->itt); | |
920 | if (!task) | |
921 | return ISCSI_ERR_BAD_ITT; | |
922 | break; | |
923 | case ISCSI_OP_R2T: | |
924 | /* | |
925 | * LLD handles R2Ts if they need to. | |
926 | */ | |
927 | return 0; | |
928 | case ISCSI_OP_LOGOUT_RSP: | |
929 | case ISCSI_OP_LOGIN_RSP: | |
930 | case ISCSI_OP_TEXT_RSP: | |
931 | case ISCSI_OP_SCSI_TMFUNC_RSP: | |
932 | case ISCSI_OP_NOOP_IN: | |
933 | task = iscsi_itt_to_task(conn, hdr->itt); | |
934 | if (!task) | |
935 | return ISCSI_ERR_BAD_ITT; | |
936 | break; | |
937 | default: | |
938 | return ISCSI_ERR_BAD_OPCODE; | |
939 | } | |
940 | ||
941 | switch(opcode) { | |
942 | case ISCSI_OP_SCSI_CMD_RSP: | |
9c19a7d0 | 943 | iscsi_scsi_cmd_rsp(conn, hdr, task, data, datalen); |
3e5c28ad MC |
944 | break; |
945 | case ISCSI_OP_SCSI_DATA_IN: | |
1d9edf02 | 946 | iscsi_data_in_rsp(conn, hdr, task); |
3e5c28ad | 947 | break; |
3e5c28ad MC |
948 | case ISCSI_OP_LOGOUT_RSP: |
949 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
950 | if (datalen) { | |
951 | rc = ISCSI_ERR_PROTO; | |
952 | break; | |
953 | } | |
954 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
955 | goto recv_pdu; | |
956 | case ISCSI_OP_LOGIN_RSP: | |
957 | case ISCSI_OP_TEXT_RSP: | |
958 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
959 | /* | |
960 | * login related PDU's exp_statsn is handled in | |
961 | * userspace | |
962 | */ | |
963 | goto recv_pdu; | |
964 | case ISCSI_OP_SCSI_TMFUNC_RSP: | |
965 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
966 | if (datalen) { | |
967 | rc = ISCSI_ERR_PROTO; | |
968 | break; | |
969 | } | |
970 | ||
971 | iscsi_tmf_rsp(conn, hdr); | |
9c19a7d0 | 972 | __iscsi_put_task(task); |
3e5c28ad MC |
973 | break; |
974 | case ISCSI_OP_NOOP_IN: | |
975 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
976 | if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) { | |
977 | rc = ISCSI_ERR_PROTO; | |
978 | break; | |
979 | } | |
980 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
981 | ||
9c19a7d0 | 982 | if (conn->ping_task != task) |
3e5c28ad MC |
983 | /* |
984 | * If this is not in response to one of our | |
985 | * nops then it must be from userspace. | |
986 | */ | |
987 | goto recv_pdu; | |
9c19a7d0 MC |
988 | |
989 | mod_timer(&conn->transport_timer, jiffies + conn->recv_timeout); | |
990 | __iscsi_put_task(task); | |
3e5c28ad MC |
991 | break; |
992 | default: | |
993 | rc = ISCSI_ERR_BAD_OPCODE; | |
994 | break; | |
995 | } | |
7996a778 | 996 | |
3e5c28ad MC |
997 | out: |
998 | return rc; | |
999 | recv_pdu: | |
1000 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) | |
1001 | rc = ISCSI_ERR_CONN_FAILED; | |
9c19a7d0 | 1002 | __iscsi_put_task(task); |
7996a778 MC |
1003 | return rc; |
1004 | } | |
913e5bf4 | 1005 | EXPORT_SYMBOL_GPL(__iscsi_complete_pdu); |
7996a778 MC |
1006 | |
1007 | int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
1008 | char *data, int datalen) | |
1009 | { | |
1010 | int rc; | |
1011 | ||
1012 | spin_lock(&conn->session->lock); | |
1013 | rc = __iscsi_complete_pdu(conn, hdr, data, datalen); | |
1014 | spin_unlock(&conn->session->lock); | |
1015 | return rc; | |
1016 | } | |
1017 | EXPORT_SYMBOL_GPL(iscsi_complete_pdu); | |
1018 | ||
0af967f5 | 1019 | int iscsi_verify_itt(struct iscsi_conn *conn, itt_t itt) |
7996a778 MC |
1020 | { |
1021 | struct iscsi_session *session = conn->session; | |
262ef636 | 1022 | int age = 0, i = 0; |
7996a778 | 1023 | |
0af967f5 MC |
1024 | if (itt == RESERVED_ITT) |
1025 | return 0; | |
7996a778 | 1026 | |
262ef636 MC |
1027 | if (session->tt->parse_pdu_itt) |
1028 | session->tt->parse_pdu_itt(conn, itt, &i, &age); | |
1029 | else { | |
1030 | i = get_itt(itt); | |
1031 | age = ((__force u32)itt >> ISCSI_AGE_SHIFT) & ISCSI_AGE_MASK; | |
1032 | } | |
1033 | ||
1034 | if (age != session->age) { | |
0af967f5 MC |
1035 | iscsi_conn_printk(KERN_ERR, conn, |
1036 | "received itt %x expected session age (%x)\n", | |
913e5bf4 | 1037 | (__force u32)itt, session->age); |
0af967f5 MC |
1038 | return ISCSI_ERR_BAD_ITT; |
1039 | } | |
7996a778 | 1040 | |
3e5c28ad MC |
1041 | if (i >= session->cmds_max) { |
1042 | iscsi_conn_printk(KERN_ERR, conn, | |
1043 | "received invalid itt index %u (max cmds " | |
1044 | "%u.\n", i, session->cmds_max); | |
1045 | return ISCSI_ERR_BAD_ITT; | |
7996a778 | 1046 | } |
7996a778 MC |
1047 | return 0; |
1048 | } | |
1049 | EXPORT_SYMBOL_GPL(iscsi_verify_itt); | |
1050 | ||
913e5bf4 MC |
1051 | /** |
1052 | * iscsi_itt_to_ctask - look up ctask by itt | |
1053 | * @conn: iscsi connection | |
1054 | * @itt: itt | |
1055 | * | |
1056 | * This should be used for cmd tasks. | |
1057 | * | |
1058 | * The session lock must be held. | |
1059 | */ | |
1060 | struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *conn, itt_t itt) | |
0af967f5 | 1061 | { |
9c19a7d0 | 1062 | struct iscsi_task *task; |
0af967f5 MC |
1063 | |
1064 | if (iscsi_verify_itt(conn, itt)) | |
1065 | return NULL; | |
1066 | ||
913e5bf4 MC |
1067 | task = iscsi_itt_to_task(conn, itt); |
1068 | if (!task || !task->sc) | |
0af967f5 MC |
1069 | return NULL; |
1070 | ||
913e5bf4 MC |
1071 | if (task->sc->SCp.phase != conn->session->age) { |
1072 | iscsi_session_printk(KERN_ERR, conn->session, | |
1073 | "task's session age %d, expected %d\n", | |
1074 | task->sc->SCp.phase, conn->session->age); | |
0af967f5 | 1075 | return NULL; |
913e5bf4 | 1076 | } |
0af967f5 | 1077 | |
9c19a7d0 | 1078 | return task; |
0af967f5 MC |
1079 | } |
1080 | EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask); | |
1081 | ||
40a06e75 | 1082 | void iscsi_session_failure(struct iscsi_session *session, |
e5bd7b54 MC |
1083 | enum iscsi_err err) |
1084 | { | |
e5bd7b54 MC |
1085 | struct iscsi_conn *conn; |
1086 | struct device *dev; | |
1087 | unsigned long flags; | |
1088 | ||
1089 | spin_lock_irqsave(&session->lock, flags); | |
1090 | conn = session->leadconn; | |
1091 | if (session->state == ISCSI_STATE_TERMINATE || !conn) { | |
1092 | spin_unlock_irqrestore(&session->lock, flags); | |
1093 | return; | |
1094 | } | |
1095 | ||
1096 | dev = get_device(&conn->cls_conn->dev); | |
1097 | spin_unlock_irqrestore(&session->lock, flags); | |
1098 | if (!dev) | |
1099 | return; | |
1100 | /* | |
1101 | * if the host is being removed bypass the connection | |
1102 | * recovery initialization because we are going to kill | |
1103 | * the session. | |
1104 | */ | |
1105 | if (err == ISCSI_ERR_INVALID_HOST) | |
1106 | iscsi_conn_error_event(conn->cls_conn, err); | |
1107 | else | |
1108 | iscsi_conn_failure(conn, err); | |
1109 | put_device(dev); | |
1110 | } | |
1111 | EXPORT_SYMBOL_GPL(iscsi_session_failure); | |
1112 | ||
7996a778 MC |
1113 | void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err) |
1114 | { | |
1115 | struct iscsi_session *session = conn->session; | |
1116 | unsigned long flags; | |
1117 | ||
1118 | spin_lock_irqsave(&session->lock, flags); | |
656cffc9 MC |
1119 | if (session->state == ISCSI_STATE_FAILED) { |
1120 | spin_unlock_irqrestore(&session->lock, flags); | |
1121 | return; | |
1122 | } | |
1123 | ||
67a61114 | 1124 | if (conn->stop_stage == 0) |
7996a778 MC |
1125 | session->state = ISCSI_STATE_FAILED; |
1126 | spin_unlock_irqrestore(&session->lock, flags); | |
e5bd7b54 | 1127 | |
7996a778 MC |
1128 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); |
1129 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
e5bd7b54 | 1130 | iscsi_conn_error_event(conn->cls_conn, err); |
7996a778 MC |
1131 | } |
1132 | EXPORT_SYMBOL_GPL(iscsi_conn_failure); | |
1133 | ||
77a23c21 MC |
1134 | static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn) |
1135 | { | |
1136 | struct iscsi_session *session = conn->session; | |
1137 | ||
1138 | /* | |
1139 | * Check for iSCSI window and take care of CmdSN wrap-around | |
1140 | */ | |
e0726407 | 1141 | if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) { |
1b2c7af8 MC |
1142 | ISCSI_DBG_SESSION(session, "iSCSI CmdSN closed. ExpCmdSn " |
1143 | "%u MaxCmdSN %u CmdSN %u/%u\n", | |
1144 | session->exp_cmdsn, session->max_cmdsn, | |
1145 | session->cmdsn, session->queued_cmdsn); | |
77a23c21 MC |
1146 | return -ENOSPC; |
1147 | } | |
1148 | return 0; | |
1149 | } | |
1150 | ||
9c19a7d0 | 1151 | static int iscsi_xmit_task(struct iscsi_conn *conn) |
77a23c21 | 1152 | { |
9c19a7d0 | 1153 | struct iscsi_task *task = conn->task; |
843c0a8a | 1154 | int rc; |
77a23c21 | 1155 | |
9c19a7d0 | 1156 | __iscsi_get_task(task); |
77a23c21 | 1157 | spin_unlock_bh(&conn->session->lock); |
9c19a7d0 | 1158 | rc = conn->session->tt->xmit_task(task); |
77a23c21 | 1159 | spin_lock_bh(&conn->session->lock); |
9c19a7d0 | 1160 | __iscsi_put_task(task); |
77a23c21 | 1161 | if (!rc) |
9c19a7d0 MC |
1162 | /* done with this task */ |
1163 | conn->task = NULL; | |
77a23c21 MC |
1164 | return rc; |
1165 | } | |
1166 | ||
843c0a8a | 1167 | /** |
9c19a7d0 MC |
1168 | * iscsi_requeue_task - requeue task to run from session workqueue |
1169 | * @task: task to requeue | |
843c0a8a | 1170 | * |
9c19a7d0 | 1171 | * LLDs that need to run a task from the session workqueue should call |
052d0144 MC |
1172 | * this. The session lock must be held. This should only be called |
1173 | * by software drivers. | |
843c0a8a | 1174 | */ |
9c19a7d0 | 1175 | void iscsi_requeue_task(struct iscsi_task *task) |
843c0a8a | 1176 | { |
9c19a7d0 | 1177 | struct iscsi_conn *conn = task->conn; |
843c0a8a | 1178 | |
9c19a7d0 | 1179 | list_move_tail(&task->running, &conn->requeue); |
32ae763e | 1180 | iscsi_conn_queue_work(conn); |
843c0a8a | 1181 | } |
9c19a7d0 | 1182 | EXPORT_SYMBOL_GPL(iscsi_requeue_task); |
843c0a8a | 1183 | |
7996a778 MC |
1184 | /** |
1185 | * iscsi_data_xmit - xmit any command into the scheduled connection | |
1186 | * @conn: iscsi connection | |
1187 | * | |
1188 | * Notes: | |
1189 | * The function can return -EAGAIN in which case the caller must | |
1190 | * re-schedule it again later or recover. '0' return code means | |
1191 | * successful xmit. | |
1192 | **/ | |
1193 | static int iscsi_data_xmit(struct iscsi_conn *conn) | |
1194 | { | |
3219e529 | 1195 | int rc = 0; |
7996a778 | 1196 | |
77a23c21 | 1197 | spin_lock_bh(&conn->session->lock); |
7996a778 | 1198 | if (unlikely(conn->suspend_tx)) { |
1b2c7af8 | 1199 | ISCSI_DBG_SESSION(conn->session, "Tx suspended!\n"); |
77a23c21 | 1200 | spin_unlock_bh(&conn->session->lock); |
3219e529 | 1201 | return -ENODATA; |
7996a778 | 1202 | } |
7996a778 | 1203 | |
9c19a7d0 MC |
1204 | if (conn->task) { |
1205 | rc = iscsi_xmit_task(conn); | |
3219e529 | 1206 | if (rc) |
7996a778 | 1207 | goto again; |
7996a778 MC |
1208 | } |
1209 | ||
77a23c21 MC |
1210 | /* |
1211 | * process mgmt pdus like nops before commands since we should | |
1212 | * only have one nop-out as a ping from us and targets should not | |
1213 | * overflow us with nop-ins | |
1214 | */ | |
1215 | check_mgmt: | |
843c0a8a | 1216 | while (!list_empty(&conn->mgmtqueue)) { |
9c19a7d0 MC |
1217 | conn->task = list_entry(conn->mgmtqueue.next, |
1218 | struct iscsi_task, running); | |
1219 | if (iscsi_prep_mgmt_task(conn, conn->task)) { | |
1220 | __iscsi_put_task(conn->task); | |
1221 | conn->task = NULL; | |
b3a7ea8d MC |
1222 | continue; |
1223 | } | |
9c19a7d0 | 1224 | rc = iscsi_xmit_task(conn); |
77a23c21 MC |
1225 | if (rc) |
1226 | goto again; | |
7996a778 MC |
1227 | } |
1228 | ||
843c0a8a | 1229 | /* process pending command queue */ |
b6c395ed | 1230 | while (!list_empty(&conn->xmitqueue)) { |
843c0a8a MC |
1231 | if (conn->tmf_state == TMF_QUEUED) |
1232 | break; | |
1233 | ||
9c19a7d0 MC |
1234 | conn->task = list_entry(conn->xmitqueue.next, |
1235 | struct iscsi_task, running); | |
b3a7ea8d | 1236 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) { |
9c19a7d0 | 1237 | fail_command(conn, conn->task, DID_IMM_RETRY << 16); |
b3a7ea8d MC |
1238 | continue; |
1239 | } | |
577577da MC |
1240 | rc = iscsi_prep_scsi_cmd_pdu(conn->task); |
1241 | if (rc) { | |
1242 | if (rc == -ENOMEM) { | |
1243 | conn->task = NULL; | |
1244 | goto again; | |
1245 | } else | |
1246 | fail_command(conn, conn->task, DID_ABORT << 16); | |
004d6530 BH |
1247 | continue; |
1248 | } | |
9c19a7d0 | 1249 | rc = iscsi_xmit_task(conn); |
77a23c21 | 1250 | if (rc) |
60ecebf5 | 1251 | goto again; |
77a23c21 | 1252 | /* |
9c19a7d0 | 1253 | * we could continuously get new task requests so |
77a23c21 MC |
1254 | * we need to check the mgmt queue for nops that need to |
1255 | * be sent to aviod starvation | |
1256 | */ | |
843c0a8a MC |
1257 | if (!list_empty(&conn->mgmtqueue)) |
1258 | goto check_mgmt; | |
1259 | } | |
1260 | ||
1261 | while (!list_empty(&conn->requeue)) { | |
1262 | if (conn->session->fast_abort && conn->tmf_state != TMF_INITIAL) | |
1263 | break; | |
1264 | ||
b3a7ea8d MC |
1265 | /* |
1266 | * we always do fastlogout - conn stop code will clean up. | |
1267 | */ | |
1268 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) | |
1269 | break; | |
1270 | ||
9c19a7d0 MC |
1271 | conn->task = list_entry(conn->requeue.next, |
1272 | struct iscsi_task, running); | |
1273 | conn->task->state = ISCSI_TASK_RUNNING; | |
843c0a8a | 1274 | list_move_tail(conn->requeue.next, &conn->run_list); |
9c19a7d0 | 1275 | rc = iscsi_xmit_task(conn); |
843c0a8a MC |
1276 | if (rc) |
1277 | goto again; | |
1278 | if (!list_empty(&conn->mgmtqueue)) | |
77a23c21 | 1279 | goto check_mgmt; |
7996a778 | 1280 | } |
b6c395ed | 1281 | spin_unlock_bh(&conn->session->lock); |
3219e529 | 1282 | return -ENODATA; |
7996a778 MC |
1283 | |
1284 | again: | |
1285 | if (unlikely(conn->suspend_tx)) | |
77a23c21 MC |
1286 | rc = -ENODATA; |
1287 | spin_unlock_bh(&conn->session->lock); | |
3219e529 | 1288 | return rc; |
7996a778 MC |
1289 | } |
1290 | ||
c4028958 | 1291 | static void iscsi_xmitworker(struct work_struct *work) |
7996a778 | 1292 | { |
c4028958 DH |
1293 | struct iscsi_conn *conn = |
1294 | container_of(work, struct iscsi_conn, xmitwork); | |
3219e529 | 1295 | int rc; |
7996a778 MC |
1296 | /* |
1297 | * serialize Xmit worker on a per-connection basis. | |
1298 | */ | |
3219e529 MC |
1299 | do { |
1300 | rc = iscsi_data_xmit(conn); | |
1301 | } while (rc >= 0 || rc == -EAGAIN); | |
7996a778 MC |
1302 | } |
1303 | ||
577577da MC |
1304 | static inline struct iscsi_task *iscsi_alloc_task(struct iscsi_conn *conn, |
1305 | struct scsi_cmnd *sc) | |
1306 | { | |
1307 | struct iscsi_task *task; | |
1308 | ||
1309 | if (!__kfifo_get(conn->session->cmdpool.queue, | |
1310 | (void *) &task, sizeof(void *))) | |
1311 | return NULL; | |
1312 | ||
1313 | sc->SCp.phase = conn->session->age; | |
1314 | sc->SCp.ptr = (char *) task; | |
1315 | ||
1316 | atomic_set(&task->refcount, 1); | |
1317 | task->state = ISCSI_TASK_PENDING; | |
1318 | task->conn = conn; | |
1319 | task->sc = sc; | |
1320 | INIT_LIST_HEAD(&task->running); | |
1321 | return task; | |
1322 | } | |
1323 | ||
7996a778 MC |
1324 | enum { |
1325 | FAILURE_BAD_HOST = 1, | |
1326 | FAILURE_SESSION_FAILED, | |
1327 | FAILURE_SESSION_FREED, | |
1328 | FAILURE_WINDOW_CLOSED, | |
60ecebf5 | 1329 | FAILURE_OOM, |
7996a778 | 1330 | FAILURE_SESSION_TERMINATE, |
656cffc9 | 1331 | FAILURE_SESSION_IN_RECOVERY, |
7996a778 | 1332 | FAILURE_SESSION_RECOVERY_TIMEOUT, |
b3a7ea8d | 1333 | FAILURE_SESSION_LOGGING_OUT, |
6eabafbe | 1334 | FAILURE_SESSION_NOT_READY, |
7996a778 MC |
1335 | }; |
1336 | ||
1337 | int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *)) | |
1338 | { | |
75613521 | 1339 | struct iscsi_cls_session *cls_session; |
7996a778 MC |
1340 | struct Scsi_Host *host; |
1341 | int reason = 0; | |
1342 | struct iscsi_session *session; | |
1343 | struct iscsi_conn *conn; | |
9c19a7d0 | 1344 | struct iscsi_task *task = NULL; |
7996a778 MC |
1345 | |
1346 | sc->scsi_done = done; | |
1347 | sc->result = 0; | |
f47f2cf5 | 1348 | sc->SCp.ptr = NULL; |
7996a778 MC |
1349 | |
1350 | host = sc->device->host; | |
1040c99d | 1351 | spin_unlock(host->host_lock); |
7996a778 | 1352 | |
75613521 MC |
1353 | cls_session = starget_to_session(scsi_target(sc->device)); |
1354 | session = cls_session->dd_data; | |
7996a778 MC |
1355 | spin_lock(&session->lock); |
1356 | ||
75613521 | 1357 | reason = iscsi_session_chkready(cls_session); |
6eabafbe MC |
1358 | if (reason) { |
1359 | sc->result = reason; | |
1360 | goto fault; | |
1361 | } | |
1362 | ||
656cffc9 MC |
1363 | /* |
1364 | * ISCSI_STATE_FAILED is a temp. state. The recovery | |
1365 | * code will decide what is best to do with command queued | |
1366 | * during this time | |
1367 | */ | |
1368 | if (session->state != ISCSI_STATE_LOGGED_IN && | |
1369 | session->state != ISCSI_STATE_FAILED) { | |
1370 | /* | |
1371 | * to handle the race between when we set the recovery state | |
1372 | * and block the session we requeue here (commands could | |
1373 | * be entering our queuecommand while a block is starting | |
1374 | * up because the block code is not locked) | |
1375 | */ | |
9000bcd6 MC |
1376 | switch (session->state) { |
1377 | case ISCSI_STATE_IN_RECOVERY: | |
656cffc9 | 1378 | reason = FAILURE_SESSION_IN_RECOVERY; |
d6d13ee1 | 1379 | goto reject; |
9000bcd6 MC |
1380 | case ISCSI_STATE_LOGGING_OUT: |
1381 | reason = FAILURE_SESSION_LOGGING_OUT; | |
d6d13ee1 | 1382 | goto reject; |
b3a7ea8d | 1383 | case ISCSI_STATE_RECOVERY_FAILED: |
656cffc9 | 1384 | reason = FAILURE_SESSION_RECOVERY_TIMEOUT; |
56d7fcfa | 1385 | sc->result = DID_TRANSPORT_FAILFAST << 16; |
b3a7ea8d MC |
1386 | break; |
1387 | case ISCSI_STATE_TERMINATE: | |
656cffc9 | 1388 | reason = FAILURE_SESSION_TERMINATE; |
6eabafbe | 1389 | sc->result = DID_NO_CONNECT << 16; |
b3a7ea8d | 1390 | break; |
b3a7ea8d | 1391 | default: |
656cffc9 | 1392 | reason = FAILURE_SESSION_FREED; |
6eabafbe | 1393 | sc->result = DID_NO_CONNECT << 16; |
b3a7ea8d | 1394 | } |
7996a778 MC |
1395 | goto fault; |
1396 | } | |
1397 | ||
7996a778 | 1398 | conn = session->leadconn; |
98644047 MC |
1399 | if (!conn) { |
1400 | reason = FAILURE_SESSION_FREED; | |
6eabafbe | 1401 | sc->result = DID_NO_CONNECT << 16; |
98644047 MC |
1402 | goto fault; |
1403 | } | |
7996a778 | 1404 | |
77a23c21 MC |
1405 | if (iscsi_check_cmdsn_window_closed(conn)) { |
1406 | reason = FAILURE_WINDOW_CLOSED; | |
1407 | goto reject; | |
1408 | } | |
1409 | ||
577577da MC |
1410 | task = iscsi_alloc_task(conn, sc); |
1411 | if (!task) { | |
60ecebf5 MC |
1412 | reason = FAILURE_OOM; |
1413 | goto reject; | |
1414 | } | |
9c19a7d0 | 1415 | list_add_tail(&task->running, &conn->xmitqueue); |
7996a778 | 1416 | |
052d0144 | 1417 | if (session->tt->caps & CAP_DATA_PATH_OFFLOAD) { |
577577da MC |
1418 | reason = iscsi_prep_scsi_cmd_pdu(task); |
1419 | if (reason) { | |
1420 | if (reason == -ENOMEM) { | |
1421 | reason = FAILURE_OOM; | |
1422 | goto prepd_reject; | |
1423 | } else { | |
1424 | sc->result = DID_ABORT << 16; | |
1425 | goto prepd_fault; | |
1426 | } | |
052d0144 | 1427 | } |
9c19a7d0 | 1428 | if (session->tt->xmit_task(task)) { |
052d0144 | 1429 | reason = FAILURE_SESSION_NOT_READY; |
577577da | 1430 | goto prepd_reject; |
052d0144 MC |
1431 | } |
1432 | } else | |
32ae763e | 1433 | iscsi_conn_queue_work(conn); |
052d0144 MC |
1434 | |
1435 | session->queued_cmdsn++; | |
1436 | spin_unlock(&session->lock); | |
1040c99d | 1437 | spin_lock(host->host_lock); |
7996a778 MC |
1438 | return 0; |
1439 | ||
577577da MC |
1440 | prepd_reject: |
1441 | sc->scsi_done = NULL; | |
1442 | iscsi_complete_command(task); | |
7996a778 MC |
1443 | reject: |
1444 | spin_unlock(&session->lock); | |
1b2c7af8 MC |
1445 | ISCSI_DBG_SESSION(session, "cmd 0x%x rejected (%d)\n", |
1446 | sc->cmnd[0], reason); | |
1040c99d | 1447 | spin_lock(host->host_lock); |
d6d13ee1 | 1448 | return SCSI_MLQUEUE_TARGET_BUSY; |
7996a778 | 1449 | |
577577da MC |
1450 | prepd_fault: |
1451 | sc->scsi_done = NULL; | |
1452 | iscsi_complete_command(task); | |
7996a778 MC |
1453 | fault: |
1454 | spin_unlock(&session->lock); | |
1b2c7af8 MC |
1455 | ISCSI_DBG_SESSION(session, "iscsi: cmd 0x%x is not queued (%d)\n", |
1456 | sc->cmnd[0], reason); | |
c07d4444 BH |
1457 | if (!scsi_bidi_cmnd(sc)) |
1458 | scsi_set_resid(sc, scsi_bufflen(sc)); | |
1459 | else { | |
1460 | scsi_out(sc)->resid = scsi_out(sc)->length; | |
1461 | scsi_in(sc)->resid = scsi_in(sc)->length; | |
1462 | } | |
052d0144 | 1463 | done(sc); |
1040c99d | 1464 | spin_lock(host->host_lock); |
7996a778 MC |
1465 | return 0; |
1466 | } | |
1467 | EXPORT_SYMBOL_GPL(iscsi_queuecommand); | |
1468 | ||
1469 | int iscsi_change_queue_depth(struct scsi_device *sdev, int depth) | |
1470 | { | |
7996a778 MC |
1471 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); |
1472 | return sdev->queue_depth; | |
1473 | } | |
1474 | EXPORT_SYMBOL_GPL(iscsi_change_queue_depth); | |
1475 | ||
6b5d6c44 MC |
1476 | int iscsi_target_alloc(struct scsi_target *starget) |
1477 | { | |
1478 | struct iscsi_cls_session *cls_session = starget_to_session(starget); | |
1479 | struct iscsi_session *session = cls_session->dd_data; | |
1480 | ||
1481 | starget->can_queue = session->scsi_cmds_max; | |
1482 | return 0; | |
1483 | } | |
1484 | EXPORT_SYMBOL_GPL(iscsi_target_alloc); | |
1485 | ||
7996a778 MC |
1486 | void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session) |
1487 | { | |
75613521 | 1488 | struct iscsi_session *session = cls_session->dd_data; |
7996a778 MC |
1489 | |
1490 | spin_lock_bh(&session->lock); | |
1491 | if (session->state != ISCSI_STATE_LOGGED_IN) { | |
656cffc9 | 1492 | session->state = ISCSI_STATE_RECOVERY_FAILED; |
843c0a8a MC |
1493 | if (session->leadconn) |
1494 | wake_up(&session->leadconn->ehwait); | |
7996a778 MC |
1495 | } |
1496 | spin_unlock_bh(&session->lock); | |
1497 | } | |
1498 | EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout); | |
1499 | ||
8e124525 | 1500 | int iscsi_eh_target_reset(struct scsi_cmnd *sc) |
7996a778 | 1501 | { |
75613521 MC |
1502 | struct iscsi_cls_session *cls_session; |
1503 | struct iscsi_session *session; | |
1504 | struct iscsi_conn *conn; | |
1505 | ||
1506 | cls_session = starget_to_session(scsi_target(sc->device)); | |
1507 | session = cls_session->dd_data; | |
1508 | conn = session->leadconn; | |
7996a778 | 1509 | |
bc436b27 | 1510 | mutex_lock(&session->eh_mutex); |
7996a778 MC |
1511 | spin_lock_bh(&session->lock); |
1512 | if (session->state == ISCSI_STATE_TERMINATE) { | |
1513 | failed: | |
1b2c7af8 MC |
1514 | iscsi_session_printk(KERN_INFO, session, |
1515 | "failing target reset: Could not log " | |
1516 | "back into target [age %d]\n", | |
1517 | session->age); | |
7996a778 | 1518 | spin_unlock_bh(&session->lock); |
bc436b27 | 1519 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1520 | return FAILED; |
1521 | } | |
1522 | ||
7996a778 | 1523 | spin_unlock_bh(&session->lock); |
bc436b27 | 1524 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1525 | /* |
1526 | * we drop the lock here but the leadconn cannot be destoyed while | |
1527 | * we are in the scsi eh | |
1528 | */ | |
843c0a8a | 1529 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
7996a778 | 1530 | |
1b2c7af8 | 1531 | ISCSI_DBG_SESSION(session, "wait for relogin\n"); |
7996a778 MC |
1532 | wait_event_interruptible(conn->ehwait, |
1533 | session->state == ISCSI_STATE_TERMINATE || | |
1534 | session->state == ISCSI_STATE_LOGGED_IN || | |
656cffc9 | 1535 | session->state == ISCSI_STATE_RECOVERY_FAILED); |
7996a778 MC |
1536 | if (signal_pending(current)) |
1537 | flush_signals(current); | |
1538 | ||
bc436b27 | 1539 | mutex_lock(&session->eh_mutex); |
7996a778 MC |
1540 | spin_lock_bh(&session->lock); |
1541 | if (session->state == ISCSI_STATE_LOGGED_IN) | |
322d739d | 1542 | iscsi_session_printk(KERN_INFO, session, |
8e124525 | 1543 | "target reset succeeded\n"); |
7996a778 MC |
1544 | else |
1545 | goto failed; | |
1546 | spin_unlock_bh(&session->lock); | |
bc436b27 | 1547 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1548 | return SUCCESS; |
1549 | } | |
8e124525 | 1550 | EXPORT_SYMBOL_GPL(iscsi_eh_target_reset); |
7996a778 | 1551 | |
843c0a8a | 1552 | static void iscsi_tmf_timedout(unsigned long data) |
7996a778 | 1553 | { |
843c0a8a | 1554 | struct iscsi_conn *conn = (struct iscsi_conn *)data; |
7996a778 MC |
1555 | struct iscsi_session *session = conn->session; |
1556 | ||
1557 | spin_lock(&session->lock); | |
843c0a8a MC |
1558 | if (conn->tmf_state == TMF_QUEUED) { |
1559 | conn->tmf_state = TMF_TIMEDOUT; | |
1b2c7af8 | 1560 | ISCSI_DBG_SESSION(session, "tmf timedout\n"); |
7996a778 MC |
1561 | /* unblock eh_abort() */ |
1562 | wake_up(&conn->ehwait); | |
1563 | } | |
1564 | spin_unlock(&session->lock); | |
1565 | } | |
1566 | ||
9c19a7d0 | 1567 | static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn, |
f6d5180c MC |
1568 | struct iscsi_tm *hdr, int age, |
1569 | int timeout) | |
7996a778 | 1570 | { |
7996a778 | 1571 | struct iscsi_session *session = conn->session; |
9c19a7d0 | 1572 | struct iscsi_task *task; |
7996a778 | 1573 | |
9c19a7d0 | 1574 | task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr, |
843c0a8a | 1575 | NULL, 0); |
9c19a7d0 | 1576 | if (!task) { |
6724add1 | 1577 | spin_unlock_bh(&session->lock); |
7996a778 | 1578 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
843c0a8a | 1579 | spin_lock_bh(&session->lock); |
1b2c7af8 | 1580 | ISCSI_DBG_SESSION(session, "tmf exec failure\n"); |
77a23c21 | 1581 | return -EPERM; |
7996a778 | 1582 | } |
843c0a8a | 1583 | conn->tmfcmd_pdus_cnt++; |
f6d5180c | 1584 | conn->tmf_timer.expires = timeout * HZ + jiffies; |
843c0a8a MC |
1585 | conn->tmf_timer.function = iscsi_tmf_timedout; |
1586 | conn->tmf_timer.data = (unsigned long)conn; | |
1587 | add_timer(&conn->tmf_timer); | |
1b2c7af8 | 1588 | ISCSI_DBG_SESSION(session, "tmf set timeout\n"); |
7996a778 | 1589 | |
7996a778 | 1590 | spin_unlock_bh(&session->lock); |
6724add1 | 1591 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1592 | |
1593 | /* | |
1594 | * block eh thread until: | |
1595 | * | |
843c0a8a MC |
1596 | * 1) tmf response |
1597 | * 2) tmf timeout | |
7996a778 MC |
1598 | * 3) session is terminated or restarted or userspace has |
1599 | * given up on recovery | |
1600 | */ | |
843c0a8a | 1601 | wait_event_interruptible(conn->ehwait, age != session->age || |
7996a778 | 1602 | session->state != ISCSI_STATE_LOGGED_IN || |
843c0a8a | 1603 | conn->tmf_state != TMF_QUEUED); |
7996a778 MC |
1604 | if (signal_pending(current)) |
1605 | flush_signals(current); | |
843c0a8a MC |
1606 | del_timer_sync(&conn->tmf_timer); |
1607 | ||
6724add1 | 1608 | mutex_lock(&session->eh_mutex); |
77a23c21 | 1609 | spin_lock_bh(&session->lock); |
9c19a7d0 | 1610 | /* if the session drops it will clean up the task */ |
843c0a8a MC |
1611 | if (age != session->age || |
1612 | session->state != ISCSI_STATE_LOGGED_IN) | |
1613 | return -ENOTCONN; | |
7996a778 MC |
1614 | return 0; |
1615 | } | |
1616 | ||
843c0a8a MC |
1617 | /* |
1618 | * Fail commands. session lock held and recv side suspended and xmit | |
1619 | * thread flushed | |
1620 | */ | |
6eabafbe MC |
1621 | static void fail_all_commands(struct iscsi_conn *conn, unsigned lun, |
1622 | int error) | |
843c0a8a | 1623 | { |
9c19a7d0 | 1624 | struct iscsi_task *task, *tmp; |
843c0a8a | 1625 | |
72899682 MC |
1626 | if (conn->task) { |
1627 | if (lun == -1 || | |
1628 | (conn->task->sc && conn->task->sc->device->lun == lun)) | |
1629 | conn->task = NULL; | |
1630 | } | |
843c0a8a MC |
1631 | |
1632 | /* flush pending */ | |
9c19a7d0 MC |
1633 | list_for_each_entry_safe(task, tmp, &conn->xmitqueue, running) { |
1634 | if (lun == task->sc->device->lun || lun == -1) { | |
1b2c7af8 MC |
1635 | ISCSI_DBG_SESSION(conn->session, |
1636 | "failing pending sc %p itt 0x%x\n", | |
1637 | task->sc, task->itt); | |
9c19a7d0 | 1638 | fail_command(conn, task, error << 16); |
843c0a8a MC |
1639 | } |
1640 | } | |
1641 | ||
9c19a7d0 MC |
1642 | list_for_each_entry_safe(task, tmp, &conn->requeue, running) { |
1643 | if (lun == task->sc->device->lun || lun == -1) { | |
1b2c7af8 MC |
1644 | ISCSI_DBG_SESSION(conn->session, |
1645 | "failing requeued sc %p itt 0x%x\n", | |
1646 | task->sc, task->itt); | |
9c19a7d0 | 1647 | fail_command(conn, task, error << 16); |
843c0a8a MC |
1648 | } |
1649 | } | |
1650 | ||
1651 | /* fail all other running */ | |
9c19a7d0 MC |
1652 | list_for_each_entry_safe(task, tmp, &conn->run_list, running) { |
1653 | if (lun == task->sc->device->lun || lun == -1) { | |
1b2c7af8 MC |
1654 | ISCSI_DBG_SESSION(conn->session, |
1655 | "failing in progress sc %p itt 0x%x\n", | |
1656 | task->sc, task->itt); | |
ac26d41d | 1657 | fail_command(conn, task, error << 16); |
843c0a8a MC |
1658 | } |
1659 | } | |
1660 | } | |
1661 | ||
b40977d9 | 1662 | void iscsi_suspend_tx(struct iscsi_conn *conn) |
6724add1 | 1663 | { |
32ae763e MC |
1664 | struct Scsi_Host *shost = conn->session->host; |
1665 | struct iscsi_host *ihost = shost_priv(shost); | |
1666 | ||
6724add1 | 1667 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); |
052d0144 | 1668 | if (!(conn->session->tt->caps & CAP_DATA_PATH_OFFLOAD)) |
32ae763e | 1669 | flush_workqueue(ihost->workq); |
6724add1 | 1670 | } |
b40977d9 | 1671 | EXPORT_SYMBOL_GPL(iscsi_suspend_tx); |
6724add1 MC |
1672 | |
1673 | static void iscsi_start_tx(struct iscsi_conn *conn) | |
1674 | { | |
1675 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
052d0144 | 1676 | if (!(conn->session->tt->caps & CAP_DATA_PATH_OFFLOAD)) |
32ae763e | 1677 | iscsi_conn_queue_work(conn); |
6724add1 MC |
1678 | } |
1679 | ||
242f9dcb | 1680 | static enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *scmd) |
f6d5180c MC |
1681 | { |
1682 | struct iscsi_cls_session *cls_session; | |
1683 | struct iscsi_session *session; | |
1684 | struct iscsi_conn *conn; | |
242f9dcb | 1685 | enum blk_eh_timer_return rc = BLK_EH_NOT_HANDLED; |
f6d5180c MC |
1686 | |
1687 | cls_session = starget_to_session(scsi_target(scmd->device)); | |
75613521 | 1688 | session = cls_session->dd_data; |
f6d5180c | 1689 | |
1b2c7af8 | 1690 | ISCSI_DBG_SESSION(session, "scsi cmd %p timedout\n", scmd); |
f6d5180c MC |
1691 | |
1692 | spin_lock(&session->lock); | |
1693 | if (session->state != ISCSI_STATE_LOGGED_IN) { | |
1694 | /* | |
1695 | * We are probably in the middle of iscsi recovery so let | |
1696 | * that complete and handle the error. | |
1697 | */ | |
242f9dcb | 1698 | rc = BLK_EH_RESET_TIMER; |
f6d5180c MC |
1699 | goto done; |
1700 | } | |
1701 | ||
1702 | conn = session->leadconn; | |
1703 | if (!conn) { | |
1704 | /* In the middle of shuting down */ | |
242f9dcb | 1705 | rc = BLK_EH_RESET_TIMER; |
f6d5180c MC |
1706 | goto done; |
1707 | } | |
1708 | ||
1709 | if (!conn->recv_timeout && !conn->ping_timeout) | |
1710 | goto done; | |
1711 | /* | |
1712 | * if the ping timedout then we are in the middle of cleaning up | |
1713 | * and can let the iscsi eh handle it | |
1714 | */ | |
1715 | if (time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) + | |
1716 | (conn->ping_timeout * HZ), jiffies)) | |
242f9dcb | 1717 | rc = BLK_EH_RESET_TIMER; |
f6d5180c MC |
1718 | /* |
1719 | * if we are about to check the transport then give the command | |
1720 | * more time | |
1721 | */ | |
1722 | if (time_before_eq(conn->last_recv + (conn->recv_timeout * HZ), | |
1723 | jiffies)) | |
242f9dcb | 1724 | rc = BLK_EH_RESET_TIMER; |
f6d5180c | 1725 | /* if in the middle of checking the transport then give us more time */ |
9c19a7d0 | 1726 | if (conn->ping_task) |
242f9dcb | 1727 | rc = BLK_EH_RESET_TIMER; |
f6d5180c MC |
1728 | done: |
1729 | spin_unlock(&session->lock); | |
1b2c7af8 MC |
1730 | ISCSI_DBG_SESSION(session, "return %s\n", rc == BLK_EH_RESET_TIMER ? |
1731 | "timer reset" : "nh"); | |
f6d5180c MC |
1732 | return rc; |
1733 | } | |
1734 | ||
1735 | static void iscsi_check_transport_timeouts(unsigned long data) | |
1736 | { | |
1737 | struct iscsi_conn *conn = (struct iscsi_conn *)data; | |
1738 | struct iscsi_session *session = conn->session; | |
4cf10435 | 1739 | unsigned long recv_timeout, next_timeout = 0, last_recv; |
f6d5180c MC |
1740 | |
1741 | spin_lock(&session->lock); | |
1742 | if (session->state != ISCSI_STATE_LOGGED_IN) | |
1743 | goto done; | |
1744 | ||
4cf10435 MC |
1745 | recv_timeout = conn->recv_timeout; |
1746 | if (!recv_timeout) | |
f6d5180c MC |
1747 | goto done; |
1748 | ||
4cf10435 | 1749 | recv_timeout *= HZ; |
f6d5180c | 1750 | last_recv = conn->last_recv; |
9c19a7d0 | 1751 | if (conn->ping_task && |
4cf10435 | 1752 | time_before_eq(conn->last_ping + (conn->ping_timeout * HZ), |
f6d5180c | 1753 | jiffies)) { |
322d739d MC |
1754 | iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs " |
1755 | "expired, last rx %lu, last ping %lu, " | |
1756 | "now %lu\n", conn->ping_timeout, last_recv, | |
1757 | conn->last_ping, jiffies); | |
f6d5180c MC |
1758 | spin_unlock(&session->lock); |
1759 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1760 | return; | |
1761 | } | |
1762 | ||
4cf10435 | 1763 | if (time_before_eq(last_recv + recv_timeout, jiffies)) { |
c8611f97 | 1764 | /* send a ping to try to provoke some traffic */ |
1b2c7af8 | 1765 | ISCSI_DBG_CONN(conn, "Sending nopout as ping\n"); |
c8611f97 | 1766 | iscsi_send_nopout(conn, NULL); |
4cf10435 | 1767 | next_timeout = conn->last_ping + (conn->ping_timeout * HZ); |
ad294e9c | 1768 | } else |
4cf10435 | 1769 | next_timeout = last_recv + recv_timeout; |
f6d5180c | 1770 | |
1b2c7af8 | 1771 | ISCSI_DBG_CONN(conn, "Setting next tmo %lu\n", next_timeout); |
ad294e9c | 1772 | mod_timer(&conn->transport_timer, next_timeout); |
f6d5180c MC |
1773 | done: |
1774 | spin_unlock(&session->lock); | |
1775 | } | |
1776 | ||
9c19a7d0 | 1777 | static void iscsi_prep_abort_task_pdu(struct iscsi_task *task, |
843c0a8a MC |
1778 | struct iscsi_tm *hdr) |
1779 | { | |
1780 | memset(hdr, 0, sizeof(*hdr)); | |
1781 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
1782 | hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK; | |
1783 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
577577da MC |
1784 | memcpy(hdr->lun, task->lun, sizeof(hdr->lun)); |
1785 | hdr->rtt = task->hdr_itt; | |
1786 | hdr->refcmdsn = task->cmdsn; | |
843c0a8a MC |
1787 | } |
1788 | ||
7996a778 MC |
1789 | int iscsi_eh_abort(struct scsi_cmnd *sc) |
1790 | { | |
75613521 MC |
1791 | struct iscsi_cls_session *cls_session; |
1792 | struct iscsi_session *session; | |
f47f2cf5 | 1793 | struct iscsi_conn *conn; |
9c19a7d0 | 1794 | struct iscsi_task *task; |
843c0a8a MC |
1795 | struct iscsi_tm *hdr; |
1796 | int rc, age; | |
7996a778 | 1797 | |
75613521 MC |
1798 | cls_session = starget_to_session(scsi_target(sc->device)); |
1799 | session = cls_session->dd_data; | |
1800 | ||
6724add1 MC |
1801 | mutex_lock(&session->eh_mutex); |
1802 | spin_lock_bh(&session->lock); | |
f47f2cf5 MC |
1803 | /* |
1804 | * if session was ISCSI_STATE_IN_RECOVERY then we may not have | |
1805 | * got the command. | |
1806 | */ | |
1807 | if (!sc->SCp.ptr) { | |
1b2c7af8 MC |
1808 | ISCSI_DBG_SESSION(session, "sc never reached iscsi layer or " |
1809 | "it completed.\n"); | |
6724add1 MC |
1810 | spin_unlock_bh(&session->lock); |
1811 | mutex_unlock(&session->eh_mutex); | |
f47f2cf5 MC |
1812 | return SUCCESS; |
1813 | } | |
1814 | ||
7996a778 MC |
1815 | /* |
1816 | * If we are not logged in or we have started a new session | |
1817 | * then let the host reset code handle this | |
1818 | */ | |
843c0a8a MC |
1819 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN || |
1820 | sc->SCp.phase != session->age) { | |
1821 | spin_unlock_bh(&session->lock); | |
1822 | mutex_unlock(&session->eh_mutex); | |
1823 | return FAILED; | |
1824 | } | |
1825 | ||
1826 | conn = session->leadconn; | |
1827 | conn->eh_abort_cnt++; | |
1828 | age = session->age; | |
1829 | ||
9c19a7d0 | 1830 | task = (struct iscsi_task *)sc->SCp.ptr; |
1b2c7af8 MC |
1831 | ISCSI_DBG_SESSION(session, "aborting [sc %p itt 0x%x]\n", |
1832 | sc, task->itt); | |
7996a778 | 1833 | |
9c19a7d0 MC |
1834 | /* task completed before time out */ |
1835 | if (!task->sc) { | |
1b2c7af8 MC |
1836 | ISCSI_DBG_SESSION(session, "sc completed while abort in " |
1837 | "progress\n"); | |
77a23c21 | 1838 | goto success; |
7ea8b828 | 1839 | } |
7996a778 | 1840 | |
9c19a7d0 MC |
1841 | if (task->state == ISCSI_TASK_PENDING) { |
1842 | fail_command(conn, task, DID_ABORT << 16); | |
77a23c21 MC |
1843 | goto success; |
1844 | } | |
7996a778 | 1845 | |
843c0a8a MC |
1846 | /* only have one tmf outstanding at a time */ |
1847 | if (conn->tmf_state != TMF_INITIAL) | |
7996a778 | 1848 | goto failed; |
843c0a8a | 1849 | conn->tmf_state = TMF_QUEUED; |
7996a778 | 1850 | |
843c0a8a | 1851 | hdr = &conn->tmhdr; |
9c19a7d0 | 1852 | iscsi_prep_abort_task_pdu(task, hdr); |
843c0a8a | 1853 | |
9c19a7d0 | 1854 | if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout)) { |
843c0a8a MC |
1855 | rc = FAILED; |
1856 | goto failed; | |
1857 | } | |
1858 | ||
1859 | switch (conn->tmf_state) { | |
1860 | case TMF_SUCCESS: | |
77a23c21 | 1861 | spin_unlock_bh(&session->lock); |
913e5bf4 MC |
1862 | /* |
1863 | * stop tx side incase the target had sent a abort rsp but | |
1864 | * the initiator was still writing out data. | |
1865 | */ | |
6724add1 | 1866 | iscsi_suspend_tx(conn); |
77a23c21 | 1867 | /* |
913e5bf4 MC |
1868 | * we do not stop the recv side because targets have been |
1869 | * good and have never sent us a successful tmf response | |
1870 | * then sent more data for the cmd. | |
77a23c21 | 1871 | */ |
77a23c21 | 1872 | spin_lock(&session->lock); |
9c19a7d0 | 1873 | fail_command(conn, task, DID_ABORT << 16); |
843c0a8a | 1874 | conn->tmf_state = TMF_INITIAL; |
77a23c21 | 1875 | spin_unlock(&session->lock); |
6724add1 | 1876 | iscsi_start_tx(conn); |
77a23c21 | 1877 | goto success_unlocked; |
843c0a8a MC |
1878 | case TMF_TIMEDOUT: |
1879 | spin_unlock_bh(&session->lock); | |
1880 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1881 | goto failed_unlocked; | |
1882 | case TMF_NOT_FOUND: | |
1883 | if (!sc->SCp.ptr) { | |
1884 | conn->tmf_state = TMF_INITIAL; | |
9c19a7d0 | 1885 | /* task completed before tmf abort response */ |
1b2c7af8 MC |
1886 | ISCSI_DBG_SESSION(session, "sc completed while abort " |
1887 | "in progress\n"); | |
77a23c21 | 1888 | goto success; |
7ea8b828 MC |
1889 | } |
1890 | /* fall through */ | |
1891 | default: | |
843c0a8a MC |
1892 | conn->tmf_state = TMF_INITIAL; |
1893 | goto failed; | |
7996a778 MC |
1894 | } |
1895 | ||
77a23c21 | 1896 | success: |
7996a778 | 1897 | spin_unlock_bh(&session->lock); |
77a23c21 | 1898 | success_unlocked: |
1b2c7af8 MC |
1899 | ISCSI_DBG_SESSION(session, "abort success [sc %p itt 0x%x]\n", |
1900 | sc, task->itt); | |
6724add1 | 1901 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1902 | return SUCCESS; |
1903 | ||
1904 | failed: | |
1905 | spin_unlock_bh(&session->lock); | |
77a23c21 | 1906 | failed_unlocked: |
1b2c7af8 MC |
1907 | ISCSI_DBG_SESSION(session, "abort failed [sc %p itt 0x%x]\n", sc, |
1908 | task ? task->itt : 0); | |
6724add1 | 1909 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1910 | return FAILED; |
1911 | } | |
1912 | EXPORT_SYMBOL_GPL(iscsi_eh_abort); | |
1913 | ||
843c0a8a MC |
1914 | static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr) |
1915 | { | |
1916 | memset(hdr, 0, sizeof(*hdr)); | |
1917 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
1918 | hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK; | |
1919 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
1920 | int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun); | |
f6d5180c | 1921 | hdr->rtt = RESERVED_ITT; |
843c0a8a MC |
1922 | } |
1923 | ||
1924 | int iscsi_eh_device_reset(struct scsi_cmnd *sc) | |
1925 | { | |
75613521 MC |
1926 | struct iscsi_cls_session *cls_session; |
1927 | struct iscsi_session *session; | |
843c0a8a MC |
1928 | struct iscsi_conn *conn; |
1929 | struct iscsi_tm *hdr; | |
1930 | int rc = FAILED; | |
1931 | ||
75613521 MC |
1932 | cls_session = starget_to_session(scsi_target(sc->device)); |
1933 | session = cls_session->dd_data; | |
1934 | ||
1b2c7af8 MC |
1935 | ISCSI_DBG_SESSION(session, "LU Reset [sc %p lun %u]\n", |
1936 | sc, sc->device->lun); | |
843c0a8a MC |
1937 | |
1938 | mutex_lock(&session->eh_mutex); | |
1939 | spin_lock_bh(&session->lock); | |
1940 | /* | |
1941 | * Just check if we are not logged in. We cannot check for | |
1942 | * the phase because the reset could come from a ioctl. | |
1943 | */ | |
1944 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN) | |
1945 | goto unlock; | |
1946 | conn = session->leadconn; | |
1947 | ||
1948 | /* only have one tmf outstanding at a time */ | |
1949 | if (conn->tmf_state != TMF_INITIAL) | |
1950 | goto unlock; | |
1951 | conn->tmf_state = TMF_QUEUED; | |
1952 | ||
1953 | hdr = &conn->tmhdr; | |
1954 | iscsi_prep_lun_reset_pdu(sc, hdr); | |
1955 | ||
9c19a7d0 | 1956 | if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age, |
f6d5180c | 1957 | session->lu_reset_timeout)) { |
843c0a8a MC |
1958 | rc = FAILED; |
1959 | goto unlock; | |
1960 | } | |
1961 | ||
1962 | switch (conn->tmf_state) { | |
1963 | case TMF_SUCCESS: | |
1964 | break; | |
1965 | case TMF_TIMEDOUT: | |
1966 | spin_unlock_bh(&session->lock); | |
1967 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1968 | goto done; | |
1969 | default: | |
1970 | conn->tmf_state = TMF_INITIAL; | |
1971 | goto unlock; | |
1972 | } | |
1973 | ||
1974 | rc = SUCCESS; | |
1975 | spin_unlock_bh(&session->lock); | |
1976 | ||
1977 | iscsi_suspend_tx(conn); | |
913e5bf4 | 1978 | |
a3439148 | 1979 | spin_lock_bh(&session->lock); |
6eabafbe | 1980 | fail_all_commands(conn, sc->device->lun, DID_ERROR); |
843c0a8a | 1981 | conn->tmf_state = TMF_INITIAL; |
a3439148 | 1982 | spin_unlock_bh(&session->lock); |
843c0a8a MC |
1983 | |
1984 | iscsi_start_tx(conn); | |
1985 | goto done; | |
1986 | ||
1987 | unlock: | |
1988 | spin_unlock_bh(&session->lock); | |
1989 | done: | |
1b2c7af8 MC |
1990 | ISCSI_DBG_SESSION(session, "dev reset result = %s\n", |
1991 | rc == SUCCESS ? "SUCCESS" : "FAILED"); | |
843c0a8a MC |
1992 | mutex_unlock(&session->eh_mutex); |
1993 | return rc; | |
1994 | } | |
1995 | EXPORT_SYMBOL_GPL(iscsi_eh_device_reset); | |
1996 | ||
6320377f OK |
1997 | /* |
1998 | * Pre-allocate a pool of @max items of @item_size. By default, the pool | |
1999 | * should be accessed via kfifo_{get,put} on q->queue. | |
2000 | * Optionally, the caller can obtain the array of object pointers | |
2001 | * by passing in a non-NULL @items pointer | |
2002 | */ | |
7996a778 | 2003 | int |
6320377f | 2004 | iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size) |
7996a778 | 2005 | { |
6320377f | 2006 | int i, num_arrays = 1; |
7996a778 | 2007 | |
6320377f | 2008 | memset(q, 0, sizeof(*q)); |
7996a778 MC |
2009 | |
2010 | q->max = max; | |
6320377f OK |
2011 | |
2012 | /* If the user passed an items pointer, he wants a copy of | |
2013 | * the array. */ | |
2014 | if (items) | |
2015 | num_arrays++; | |
2016 | q->pool = kzalloc(num_arrays * max * sizeof(void*), GFP_KERNEL); | |
2017 | if (q->pool == NULL) | |
f474a37b | 2018 | return -ENOMEM; |
7996a778 MC |
2019 | |
2020 | q->queue = kfifo_init((void*)q->pool, max * sizeof(void*), | |
2021 | GFP_KERNEL, NULL); | |
fd6e1c14 JD |
2022 | if (IS_ERR(q->queue)) { |
2023 | q->queue = NULL; | |
6320377f | 2024 | goto enomem; |
fd6e1c14 | 2025 | } |
7996a778 MC |
2026 | |
2027 | for (i = 0; i < max; i++) { | |
6320377f | 2028 | q->pool[i] = kzalloc(item_size, GFP_KERNEL); |
7996a778 | 2029 | if (q->pool[i] == NULL) { |
6320377f OK |
2030 | q->max = i; |
2031 | goto enomem; | |
7996a778 | 2032 | } |
7996a778 MC |
2033 | __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*)); |
2034 | } | |
6320377f OK |
2035 | |
2036 | if (items) { | |
2037 | *items = q->pool + max; | |
2038 | memcpy(*items, q->pool, max * sizeof(void *)); | |
2039 | } | |
2040 | ||
7996a778 | 2041 | return 0; |
6320377f OK |
2042 | |
2043 | enomem: | |
2044 | iscsi_pool_free(q); | |
2045 | return -ENOMEM; | |
7996a778 MC |
2046 | } |
2047 | EXPORT_SYMBOL_GPL(iscsi_pool_init); | |
2048 | ||
6320377f | 2049 | void iscsi_pool_free(struct iscsi_pool *q) |
7996a778 MC |
2050 | { |
2051 | int i; | |
2052 | ||
2053 | for (i = 0; i < q->max; i++) | |
6320377f | 2054 | kfree(q->pool[i]); |
f474a37b | 2055 | kfree(q->pool); |
2f5899a3 | 2056 | kfree(q->queue); |
7996a778 MC |
2057 | } |
2058 | EXPORT_SYMBOL_GPL(iscsi_pool_free); | |
2059 | ||
a4804cd6 MC |
2060 | /** |
2061 | * iscsi_host_add - add host to system | |
2062 | * @shost: scsi host | |
2063 | * @pdev: parent device | |
2064 | * | |
2065 | * This should be called by partial offload and software iscsi drivers | |
2066 | * to add a host to the system. | |
2067 | */ | |
2068 | int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev) | |
2069 | { | |
8e9a20ce MC |
2070 | if (!shost->can_queue) |
2071 | shost->can_queue = ISCSI_DEF_XMIT_CMDS_MAX; | |
2072 | ||
4d108350 MC |
2073 | if (!shost->cmd_per_lun) |
2074 | shost->cmd_per_lun = ISCSI_DEF_CMD_PER_LUN; | |
2075 | ||
308cec14 MC |
2076 | if (!shost->transportt->eh_timed_out) |
2077 | shost->transportt->eh_timed_out = iscsi_eh_cmd_timed_out; | |
a4804cd6 MC |
2078 | return scsi_add_host(shost, pdev); |
2079 | } | |
2080 | EXPORT_SYMBOL_GPL(iscsi_host_add); | |
2081 | ||
2082 | /** | |
2083 | * iscsi_host_alloc - allocate a host and driver data | |
2084 | * @sht: scsi host template | |
2085 | * @dd_data_size: driver host data size | |
32ae763e | 2086 | * @xmit_can_sleep: bool indicating if LLD will queue IO from a work queue |
a4804cd6 MC |
2087 | * |
2088 | * This should be called by partial offload and software iscsi drivers. | |
2089 | * To access the driver specific memory use the iscsi_host_priv() macro. | |
2090 | */ | |
2091 | struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht, | |
4d108350 | 2092 | int dd_data_size, bool xmit_can_sleep) |
75613521 | 2093 | { |
a4804cd6 | 2094 | struct Scsi_Host *shost; |
e5bd7b54 | 2095 | struct iscsi_host *ihost; |
a4804cd6 MC |
2096 | |
2097 | shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size); | |
2098 | if (!shost) | |
2099 | return NULL; | |
e5bd7b54 | 2100 | ihost = shost_priv(shost); |
32ae763e MC |
2101 | |
2102 | if (xmit_can_sleep) { | |
2103 | snprintf(ihost->workq_name, sizeof(ihost->workq_name), | |
2104 | "iscsi_q_%d", shost->host_no); | |
2105 | ihost->workq = create_singlethread_workqueue(ihost->workq_name); | |
2106 | if (!ihost->workq) | |
2107 | goto free_host; | |
2108 | } | |
2109 | ||
e5bd7b54 MC |
2110 | spin_lock_init(&ihost->lock); |
2111 | ihost->state = ISCSI_HOST_SETUP; | |
2112 | ihost->num_sessions = 0; | |
2113 | init_waitqueue_head(&ihost->session_removal_wq); | |
a4804cd6 | 2114 | return shost; |
32ae763e MC |
2115 | |
2116 | free_host: | |
2117 | scsi_host_put(shost); | |
2118 | return NULL; | |
a4804cd6 MC |
2119 | } |
2120 | EXPORT_SYMBOL_GPL(iscsi_host_alloc); | |
2121 | ||
e5bd7b54 MC |
2122 | static void iscsi_notify_host_removed(struct iscsi_cls_session *cls_session) |
2123 | { | |
40a06e75 | 2124 | iscsi_session_failure(cls_session->dd_data, ISCSI_ERR_INVALID_HOST); |
e5bd7b54 MC |
2125 | } |
2126 | ||
a4804cd6 MC |
2127 | /** |
2128 | * iscsi_host_remove - remove host and sessions | |
2129 | * @shost: scsi host | |
2130 | * | |
e5bd7b54 MC |
2131 | * If there are any sessions left, this will initiate the removal and wait |
2132 | * for the completion. | |
a4804cd6 MC |
2133 | */ |
2134 | void iscsi_host_remove(struct Scsi_Host *shost) | |
2135 | { | |
e5bd7b54 MC |
2136 | struct iscsi_host *ihost = shost_priv(shost); |
2137 | unsigned long flags; | |
2138 | ||
2139 | spin_lock_irqsave(&ihost->lock, flags); | |
2140 | ihost->state = ISCSI_HOST_REMOVED; | |
2141 | spin_unlock_irqrestore(&ihost->lock, flags); | |
2142 | ||
2143 | iscsi_host_for_each_session(shost, iscsi_notify_host_removed); | |
2144 | wait_event_interruptible(ihost->session_removal_wq, | |
2145 | ihost->num_sessions == 0); | |
2146 | if (signal_pending(current)) | |
2147 | flush_signals(current); | |
2148 | ||
a4804cd6 | 2149 | scsi_remove_host(shost); |
32ae763e MC |
2150 | if (ihost->workq) |
2151 | destroy_workqueue(ihost->workq); | |
75613521 | 2152 | } |
a4804cd6 | 2153 | EXPORT_SYMBOL_GPL(iscsi_host_remove); |
7996a778 | 2154 | |
a4804cd6 | 2155 | void iscsi_host_free(struct Scsi_Host *shost) |
75613521 MC |
2156 | { |
2157 | struct iscsi_host *ihost = shost_priv(shost); | |
7996a778 | 2158 | |
75613521 MC |
2159 | kfree(ihost->netdev); |
2160 | kfree(ihost->hwaddress); | |
2161 | kfree(ihost->initiatorname); | |
a4804cd6 | 2162 | scsi_host_put(shost); |
75613521 | 2163 | } |
a4804cd6 | 2164 | EXPORT_SYMBOL_GPL(iscsi_host_free); |
7996a778 | 2165 | |
e5bd7b54 MC |
2166 | static void iscsi_host_dec_session_cnt(struct Scsi_Host *shost) |
2167 | { | |
2168 | struct iscsi_host *ihost = shost_priv(shost); | |
2169 | unsigned long flags; | |
2170 | ||
2171 | shost = scsi_host_get(shost); | |
2172 | if (!shost) { | |
2173 | printk(KERN_ERR "Invalid state. Cannot notify host removal " | |
2174 | "of session teardown event because host already " | |
2175 | "removed.\n"); | |
2176 | return; | |
2177 | } | |
2178 | ||
2179 | spin_lock_irqsave(&ihost->lock, flags); | |
2180 | ihost->num_sessions--; | |
2181 | if (ihost->num_sessions == 0) | |
2182 | wake_up(&ihost->session_removal_wq); | |
2183 | spin_unlock_irqrestore(&ihost->lock, flags); | |
2184 | scsi_host_put(shost); | |
2185 | } | |
2186 | ||
7996a778 MC |
2187 | /** |
2188 | * iscsi_session_setup - create iscsi cls session and host and session | |
7996a778 | 2189 | * @iscsit: iscsi transport template |
75613521 MC |
2190 | * @shost: scsi host |
2191 | * @cmds_max: session can queue | |
9c19a7d0 | 2192 | * @cmd_task_size: LLD task private data size |
7996a778 | 2193 | * @initial_cmdsn: initial CmdSN |
7996a778 MC |
2194 | * |
2195 | * This can be used by software iscsi_transports that allocate | |
2196 | * a session per scsi host. | |
3cf7b233 MC |
2197 | * |
2198 | * Callers should set cmds_max to the largest total numer (mgmt + scsi) of | |
2199 | * tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks | |
2200 | * for nop handling and login/logout requests. | |
75613521 | 2201 | */ |
7996a778 | 2202 | struct iscsi_cls_session * |
75613521 | 2203 | iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost, |
3cf7b233 | 2204 | uint16_t cmds_max, int cmd_task_size, |
7970634b | 2205 | uint32_t initial_cmdsn, unsigned int id) |
7996a778 | 2206 | { |
e5bd7b54 | 2207 | struct iscsi_host *ihost = shost_priv(shost); |
7996a778 MC |
2208 | struct iscsi_session *session; |
2209 | struct iscsi_cls_session *cls_session; | |
3cf7b233 | 2210 | int cmd_i, scsi_cmds, total_cmds = cmds_max; |
e5bd7b54 MC |
2211 | unsigned long flags; |
2212 | ||
2213 | spin_lock_irqsave(&ihost->lock, flags); | |
2214 | if (ihost->state == ISCSI_HOST_REMOVED) { | |
2215 | spin_unlock_irqrestore(&ihost->lock, flags); | |
2216 | return NULL; | |
2217 | } | |
2218 | ihost->num_sessions++; | |
2219 | spin_unlock_irqrestore(&ihost->lock, flags); | |
8e9a20ce MC |
2220 | |
2221 | if (!total_cmds) | |
2222 | total_cmds = ISCSI_DEF_XMIT_CMDS_MAX; | |
3e5c28ad | 2223 | /* |
3cf7b233 MC |
2224 | * The iscsi layer needs some tasks for nop handling and tmfs, |
2225 | * so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX | |
2226 | * + 1 command for scsi IO. | |
3e5c28ad | 2227 | */ |
3cf7b233 MC |
2228 | if (total_cmds < ISCSI_TOTAL_CMDS_MIN) { |
2229 | printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " | |
2230 | "must be a power of two that is at least %d.\n", | |
2231 | total_cmds, ISCSI_TOTAL_CMDS_MIN); | |
e5bd7b54 | 2232 | goto dec_session_count; |
3cf7b233 MC |
2233 | } |
2234 | ||
2235 | if (total_cmds > ISCSI_TOTAL_CMDS_MAX) { | |
2236 | printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " | |
2237 | "must be a power of 2 less than or equal to %d.\n", | |
2238 | cmds_max, ISCSI_TOTAL_CMDS_MAX); | |
2239 | total_cmds = ISCSI_TOTAL_CMDS_MAX; | |
2240 | } | |
2241 | ||
2242 | if (!is_power_of_2(total_cmds)) { | |
2243 | printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " | |
2244 | "must be a power of 2.\n", total_cmds); | |
2245 | total_cmds = rounddown_pow_of_two(total_cmds); | |
2246 | if (total_cmds < ISCSI_TOTAL_CMDS_MIN) | |
2247 | return NULL; | |
2248 | printk(KERN_INFO "iscsi: Rounding can_queue to %d.\n", | |
2249 | total_cmds); | |
1548271e | 2250 | } |
3cf7b233 | 2251 | scsi_cmds = total_cmds - ISCSI_MGMT_CMDS_MAX; |
1548271e | 2252 | |
5d91e209 MC |
2253 | cls_session = iscsi_alloc_session(shost, iscsit, |
2254 | sizeof(struct iscsi_session)); | |
75613521 | 2255 | if (!cls_session) |
e5bd7b54 | 2256 | goto dec_session_count; |
75613521 MC |
2257 | session = cls_session->dd_data; |
2258 | session->cls_session = cls_session; | |
7996a778 MC |
2259 | session->host = shost; |
2260 | session->state = ISCSI_STATE_FREE; | |
f6d5180c | 2261 | session->fast_abort = 1; |
4cd49ea1 MC |
2262 | session->lu_reset_timeout = 15; |
2263 | session->abort_timeout = 10; | |
3cf7b233 MC |
2264 | session->scsi_cmds_max = scsi_cmds; |
2265 | session->cmds_max = total_cmds; | |
e0726407 | 2266 | session->queued_cmdsn = session->cmdsn = initial_cmdsn; |
7996a778 MC |
2267 | session->exp_cmdsn = initial_cmdsn + 1; |
2268 | session->max_cmdsn = initial_cmdsn + 1; | |
2269 | session->max_r2t = 1; | |
2270 | session->tt = iscsit; | |
6724add1 | 2271 | mutex_init(&session->eh_mutex); |
75613521 | 2272 | spin_lock_init(&session->lock); |
7996a778 MC |
2273 | |
2274 | /* initialize SCSI PDU commands pool */ | |
2275 | if (iscsi_pool_init(&session->cmdpool, session->cmds_max, | |
2276 | (void***)&session->cmds, | |
9c19a7d0 | 2277 | cmd_task_size + sizeof(struct iscsi_task))) |
7996a778 MC |
2278 | goto cmdpool_alloc_fail; |
2279 | ||
2280 | /* pre-format cmds pool with ITT */ | |
2281 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
9c19a7d0 | 2282 | struct iscsi_task *task = session->cmds[cmd_i]; |
7996a778 | 2283 | |
9c19a7d0 MC |
2284 | if (cmd_task_size) |
2285 | task->dd_data = &task[1]; | |
2286 | task->itt = cmd_i; | |
2287 | INIT_LIST_HEAD(&task->running); | |
7996a778 MC |
2288 | } |
2289 | ||
f53a88da | 2290 | if (!try_module_get(iscsit->owner)) |
75613521 | 2291 | goto module_get_fail; |
7996a778 | 2292 | |
7970634b | 2293 | if (iscsi_add_session(cls_session, id)) |
75613521 | 2294 | goto cls_session_fail; |
e5bd7b54 | 2295 | |
7996a778 MC |
2296 | return cls_session; |
2297 | ||
2298 | cls_session_fail: | |
75613521 MC |
2299 | module_put(iscsit->owner); |
2300 | module_get_fail: | |
6320377f | 2301 | iscsi_pool_free(&session->cmdpool); |
7996a778 | 2302 | cmdpool_alloc_fail: |
75613521 | 2303 | iscsi_free_session(cls_session); |
e5bd7b54 MC |
2304 | dec_session_count: |
2305 | iscsi_host_dec_session_cnt(shost); | |
7996a778 MC |
2306 | return NULL; |
2307 | } | |
2308 | EXPORT_SYMBOL_GPL(iscsi_session_setup); | |
2309 | ||
2310 | /** | |
2311 | * iscsi_session_teardown - destroy session, host, and cls_session | |
75613521 | 2312 | * @cls_session: iscsi session |
7996a778 | 2313 | * |
75613521 MC |
2314 | * The driver must have called iscsi_remove_session before |
2315 | * calling this. | |
2316 | */ | |
7996a778 MC |
2317 | void iscsi_session_teardown(struct iscsi_cls_session *cls_session) |
2318 | { | |
75613521 | 2319 | struct iscsi_session *session = cls_session->dd_data; |
63f75cc8 | 2320 | struct module *owner = cls_session->transport->owner; |
e5bd7b54 | 2321 | struct Scsi_Host *shost = session->host; |
7996a778 | 2322 | |
6320377f | 2323 | iscsi_pool_free(&session->cmdpool); |
7996a778 | 2324 | |
b2c64167 MC |
2325 | kfree(session->password); |
2326 | kfree(session->password_in); | |
2327 | kfree(session->username); | |
2328 | kfree(session->username_in); | |
f3ff0c36 | 2329 | kfree(session->targetname); |
88dfd340 MC |
2330 | kfree(session->initiatorname); |
2331 | kfree(session->ifacename); | |
f3ff0c36 | 2332 | |
75613521 | 2333 | iscsi_destroy_session(cls_session); |
e5bd7b54 | 2334 | iscsi_host_dec_session_cnt(shost); |
63f75cc8 | 2335 | module_put(owner); |
7996a778 MC |
2336 | } |
2337 | EXPORT_SYMBOL_GPL(iscsi_session_teardown); | |
2338 | ||
2339 | /** | |
2340 | * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn | |
2341 | * @cls_session: iscsi_cls_session | |
5d91e209 | 2342 | * @dd_size: private driver data size |
7996a778 | 2343 | * @conn_idx: cid |
5d91e209 | 2344 | */ |
7996a778 | 2345 | struct iscsi_cls_conn * |
5d91e209 MC |
2346 | iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size, |
2347 | uint32_t conn_idx) | |
7996a778 | 2348 | { |
75613521 | 2349 | struct iscsi_session *session = cls_session->dd_data; |
7996a778 MC |
2350 | struct iscsi_conn *conn; |
2351 | struct iscsi_cls_conn *cls_conn; | |
d36ab6f3 | 2352 | char *data; |
7996a778 | 2353 | |
5d91e209 MC |
2354 | cls_conn = iscsi_create_conn(cls_session, sizeof(*conn) + dd_size, |
2355 | conn_idx); | |
7996a778 MC |
2356 | if (!cls_conn) |
2357 | return NULL; | |
2358 | conn = cls_conn->dd_data; | |
5d91e209 | 2359 | memset(conn, 0, sizeof(*conn) + dd_size); |
7996a778 | 2360 | |
5d91e209 | 2361 | conn->dd_data = cls_conn->dd_data + sizeof(*conn); |
7996a778 MC |
2362 | conn->session = session; |
2363 | conn->cls_conn = cls_conn; | |
2364 | conn->c_stage = ISCSI_CONN_INITIAL_STAGE; | |
2365 | conn->id = conn_idx; | |
2366 | conn->exp_statsn = 0; | |
843c0a8a | 2367 | conn->tmf_state = TMF_INITIAL; |
f6d5180c MC |
2368 | |
2369 | init_timer(&conn->transport_timer); | |
2370 | conn->transport_timer.data = (unsigned long)conn; | |
2371 | conn->transport_timer.function = iscsi_check_transport_timeouts; | |
2372 | ||
7996a778 MC |
2373 | INIT_LIST_HEAD(&conn->run_list); |
2374 | INIT_LIST_HEAD(&conn->mgmt_run_list); | |
843c0a8a | 2375 | INIT_LIST_HEAD(&conn->mgmtqueue); |
b6c395ed | 2376 | INIT_LIST_HEAD(&conn->xmitqueue); |
843c0a8a | 2377 | INIT_LIST_HEAD(&conn->requeue); |
c4028958 | 2378 | INIT_WORK(&conn->xmitwork, iscsi_xmitworker); |
7996a778 | 2379 | |
9c19a7d0 | 2380 | /* allocate login_task used for the login/text sequences */ |
7996a778 | 2381 | spin_lock_bh(&session->lock); |
3e5c28ad | 2382 | if (!__kfifo_get(session->cmdpool.queue, |
9c19a7d0 | 2383 | (void*)&conn->login_task, |
7996a778 MC |
2384 | sizeof(void*))) { |
2385 | spin_unlock_bh(&session->lock); | |
9c19a7d0 | 2386 | goto login_task_alloc_fail; |
7996a778 MC |
2387 | } |
2388 | spin_unlock_bh(&session->lock); | |
2389 | ||
cfeb2cf9 MC |
2390 | data = (char *) __get_free_pages(GFP_KERNEL, |
2391 | get_order(ISCSI_DEF_MAX_RECV_SEG_LEN)); | |
d36ab6f3 | 2392 | if (!data) |
9c19a7d0 MC |
2393 | goto login_task_data_alloc_fail; |
2394 | conn->login_task->data = conn->data = data; | |
d36ab6f3 | 2395 | |
843c0a8a | 2396 | init_timer(&conn->tmf_timer); |
7996a778 MC |
2397 | init_waitqueue_head(&conn->ehwait); |
2398 | ||
2399 | return cls_conn; | |
2400 | ||
9c19a7d0 MC |
2401 | login_task_data_alloc_fail: |
2402 | __kfifo_put(session->cmdpool.queue, (void*)&conn->login_task, | |
d36ab6f3 | 2403 | sizeof(void*)); |
9c19a7d0 | 2404 | login_task_alloc_fail: |
7996a778 MC |
2405 | iscsi_destroy_conn(cls_conn); |
2406 | return NULL; | |
2407 | } | |
2408 | EXPORT_SYMBOL_GPL(iscsi_conn_setup); | |
2409 | ||
2410 | /** | |
2411 | * iscsi_conn_teardown - teardown iscsi connection | |
2412 | * cls_conn: iscsi class connection | |
2413 | * | |
2414 | * TODO: we may need to make this into a two step process | |
2415 | * like scsi-mls remove + put host | |
2416 | */ | |
2417 | void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn) | |
2418 | { | |
2419 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2420 | struct iscsi_session *session = conn->session; | |
2421 | unsigned long flags; | |
2422 | ||
f6d5180c MC |
2423 | del_timer_sync(&conn->transport_timer); |
2424 | ||
7996a778 MC |
2425 | spin_lock_bh(&session->lock); |
2426 | conn->c_stage = ISCSI_CONN_CLEANUP_WAIT; | |
2427 | if (session->leadconn == conn) { | |
2428 | /* | |
2429 | * leading connection? then give up on recovery. | |
2430 | */ | |
2431 | session->state = ISCSI_STATE_TERMINATE; | |
2432 | wake_up(&conn->ehwait); | |
2433 | } | |
2434 | spin_unlock_bh(&session->lock); | |
2435 | ||
7996a778 MC |
2436 | /* |
2437 | * Block until all in-progress commands for this connection | |
2438 | * time out or fail. | |
2439 | */ | |
2440 | for (;;) { | |
2441 | spin_lock_irqsave(session->host->host_lock, flags); | |
2442 | if (!session->host->host_busy) { /* OK for ERL == 0 */ | |
2443 | spin_unlock_irqrestore(session->host->host_lock, flags); | |
2444 | break; | |
2445 | } | |
2446 | spin_unlock_irqrestore(session->host->host_lock, flags); | |
2447 | msleep_interruptible(500); | |
322d739d MC |
2448 | iscsi_conn_printk(KERN_INFO, conn, "iscsi conn_destroy(): " |
2449 | "host_busy %d host_failed %d\n", | |
2450 | session->host->host_busy, | |
2451 | session->host->host_failed); | |
7996a778 MC |
2452 | /* |
2453 | * force eh_abort() to unblock | |
2454 | */ | |
2455 | wake_up(&conn->ehwait); | |
2456 | } | |
2457 | ||
779ea120 | 2458 | /* flush queued up work because we free the connection below */ |
843c0a8a | 2459 | iscsi_suspend_tx(conn); |
779ea120 | 2460 | |
7996a778 | 2461 | spin_lock_bh(&session->lock); |
cfeb2cf9 MC |
2462 | free_pages((unsigned long) conn->data, |
2463 | get_order(ISCSI_DEF_MAX_RECV_SEG_LEN)); | |
f3ff0c36 | 2464 | kfree(conn->persistent_address); |
9c19a7d0 | 2465 | __kfifo_put(session->cmdpool.queue, (void*)&conn->login_task, |
7996a778 | 2466 | sizeof(void*)); |
e0726407 | 2467 | if (session->leadconn == conn) |
7996a778 | 2468 | session->leadconn = NULL; |
7996a778 MC |
2469 | spin_unlock_bh(&session->lock); |
2470 | ||
7996a778 MC |
2471 | iscsi_destroy_conn(cls_conn); |
2472 | } | |
2473 | EXPORT_SYMBOL_GPL(iscsi_conn_teardown); | |
2474 | ||
2475 | int iscsi_conn_start(struct iscsi_cls_conn *cls_conn) | |
2476 | { | |
2477 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2478 | struct iscsi_session *session = conn->session; | |
2479 | ||
ffd0436e | 2480 | if (!session) { |
322d739d MC |
2481 | iscsi_conn_printk(KERN_ERR, conn, |
2482 | "can't start unbound connection\n"); | |
7996a778 MC |
2483 | return -EPERM; |
2484 | } | |
2485 | ||
db98ccde MC |
2486 | if ((session->imm_data_en || !session->initial_r2t_en) && |
2487 | session->first_burst > session->max_burst) { | |
322d739d MC |
2488 | iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: " |
2489 | "first_burst %d max_burst %d\n", | |
2490 | session->first_burst, session->max_burst); | |
ffd0436e MC |
2491 | return -EINVAL; |
2492 | } | |
2493 | ||
f6d5180c | 2494 | if (conn->ping_timeout && !conn->recv_timeout) { |
322d739d MC |
2495 | iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of " |
2496 | "zero. Using 5 seconds\n."); | |
f6d5180c MC |
2497 | conn->recv_timeout = 5; |
2498 | } | |
2499 | ||
2500 | if (conn->recv_timeout && !conn->ping_timeout) { | |
322d739d MC |
2501 | iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of " |
2502 | "zero. Using 5 seconds.\n"); | |
f6d5180c MC |
2503 | conn->ping_timeout = 5; |
2504 | } | |
2505 | ||
7996a778 MC |
2506 | spin_lock_bh(&session->lock); |
2507 | conn->c_stage = ISCSI_CONN_STARTED; | |
2508 | session->state = ISCSI_STATE_LOGGED_IN; | |
e0726407 | 2509 | session->queued_cmdsn = session->cmdsn; |
7996a778 | 2510 | |
f6d5180c MC |
2511 | conn->last_recv = jiffies; |
2512 | conn->last_ping = jiffies; | |
2513 | if (conn->recv_timeout && conn->ping_timeout) | |
2514 | mod_timer(&conn->transport_timer, | |
2515 | jiffies + (conn->recv_timeout * HZ)); | |
2516 | ||
7996a778 MC |
2517 | switch(conn->stop_stage) { |
2518 | case STOP_CONN_RECOVER: | |
2519 | /* | |
2520 | * unblock eh_abort() if it is blocked. re-try all | |
2521 | * commands after successful recovery | |
2522 | */ | |
7996a778 | 2523 | conn->stop_stage = 0; |
843c0a8a | 2524 | conn->tmf_state = TMF_INITIAL; |
7996a778 | 2525 | session->age++; |
8b1d0343 MC |
2526 | if (session->age == 16) |
2527 | session->age = 0; | |
6eabafbe | 2528 | break; |
7996a778 | 2529 | case STOP_CONN_TERM: |
7996a778 | 2530 | conn->stop_stage = 0; |
7996a778 MC |
2531 | break; |
2532 | default: | |
2533 | break; | |
2534 | } | |
2535 | spin_unlock_bh(&session->lock); | |
2536 | ||
75613521 | 2537 | iscsi_unblock_session(session->cls_session); |
6eabafbe | 2538 | wake_up(&conn->ehwait); |
7996a778 MC |
2539 | return 0; |
2540 | } | |
2541 | EXPORT_SYMBOL_GPL(iscsi_conn_start); | |
2542 | ||
2543 | static void | |
2544 | flush_control_queues(struct iscsi_session *session, struct iscsi_conn *conn) | |
2545 | { | |
9c19a7d0 | 2546 | struct iscsi_task *task, *tmp; |
7996a778 MC |
2547 | |
2548 | /* handle pending */ | |
9c19a7d0 | 2549 | list_for_each_entry_safe(task, tmp, &conn->mgmtqueue, running) { |
1b2c7af8 MC |
2550 | ISCSI_DBG_SESSION(session, "flushing pending mgmt task " |
2551 | "itt 0x%x\n", task->itt); | |
9c19a7d0 MC |
2552 | /* release ref from prep task */ |
2553 | __iscsi_put_task(task); | |
7996a778 MC |
2554 | } |
2555 | ||
2556 | /* handle running */ | |
9c19a7d0 | 2557 | list_for_each_entry_safe(task, tmp, &conn->mgmt_run_list, running) { |
1b2c7af8 MC |
2558 | ISCSI_DBG_SESSION(session, "flushing running mgmt task " |
2559 | "itt 0x%x\n", task->itt); | |
9c19a7d0 MC |
2560 | /* release ref from prep task */ |
2561 | __iscsi_put_task(task); | |
7996a778 MC |
2562 | } |
2563 | ||
9c19a7d0 | 2564 | conn->task = NULL; |
7996a778 MC |
2565 | } |
2566 | ||
656cffc9 MC |
2567 | static void iscsi_start_session_recovery(struct iscsi_session *session, |
2568 | struct iscsi_conn *conn, int flag) | |
7996a778 | 2569 | { |
ed2abc7f MC |
2570 | int old_stop_stage; |
2571 | ||
6724add1 | 2572 | mutex_lock(&session->eh_mutex); |
7996a778 | 2573 | spin_lock_bh(&session->lock); |
ed2abc7f | 2574 | if (conn->stop_stage == STOP_CONN_TERM) { |
7996a778 | 2575 | spin_unlock_bh(&session->lock); |
6724add1 MC |
2576 | mutex_unlock(&session->eh_mutex); |
2577 | return; | |
2578 | } | |
2579 | ||
ed2abc7f MC |
2580 | /* |
2581 | * When this is called for the in_login state, we only want to clean | |
9c19a7d0 | 2582 | * up the login task and connection. We do not need to block and set |
67a61114 | 2583 | * the recovery state again |
ed2abc7f | 2584 | */ |
67a61114 MC |
2585 | if (flag == STOP_CONN_TERM) |
2586 | session->state = ISCSI_STATE_TERMINATE; | |
2587 | else if (conn->stop_stage != STOP_CONN_RECOVER) | |
2588 | session->state = ISCSI_STATE_IN_RECOVERY; | |
26013ad4 | 2589 | spin_unlock_bh(&session->lock); |
ed2abc7f | 2590 | |
26013ad4 MC |
2591 | del_timer_sync(&conn->transport_timer); |
2592 | iscsi_suspend_tx(conn); | |
2593 | ||
2594 | spin_lock_bh(&session->lock); | |
ed2abc7f | 2595 | old_stop_stage = conn->stop_stage; |
7996a778 | 2596 | conn->stop_stage = flag; |
67a61114 | 2597 | conn->c_stage = ISCSI_CONN_STOPPED; |
7996a778 | 2598 | spin_unlock_bh(&session->lock); |
6724add1 | 2599 | |
7996a778 MC |
2600 | /* |
2601 | * for connection level recovery we should not calculate | |
2602 | * header digest. conn->hdr_size used for optimization | |
2603 | * in hdr_extract() and will be re-negotiated at | |
2604 | * set_param() time. | |
2605 | */ | |
2606 | if (flag == STOP_CONN_RECOVER) { | |
2607 | conn->hdrdgst_en = 0; | |
2608 | conn->datadgst_en = 0; | |
656cffc9 | 2609 | if (session->state == ISCSI_STATE_IN_RECOVERY && |
67a61114 | 2610 | old_stop_stage != STOP_CONN_RECOVER) { |
1b2c7af8 | 2611 | ISCSI_DBG_SESSION(session, "blocking session\n"); |
75613521 | 2612 | iscsi_block_session(session->cls_session); |
67a61114 | 2613 | } |
7996a778 | 2614 | } |
656cffc9 | 2615 | |
656cffc9 MC |
2616 | /* |
2617 | * flush queues. | |
2618 | */ | |
2619 | spin_lock_bh(&session->lock); | |
87cd9eab | 2620 | if (flag == STOP_CONN_RECOVER) |
56d7fcfa MC |
2621 | fail_all_commands(conn, -1, DID_TRANSPORT_DISRUPTED); |
2622 | else | |
2623 | fail_all_commands(conn, -1, DID_ERROR); | |
656cffc9 MC |
2624 | flush_control_queues(session, conn); |
2625 | spin_unlock_bh(&session->lock); | |
6724add1 | 2626 | mutex_unlock(&session->eh_mutex); |
7996a778 | 2627 | } |
7996a778 MC |
2628 | |
2629 | void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) | |
2630 | { | |
2631 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2632 | struct iscsi_session *session = conn->session; | |
2633 | ||
2634 | switch (flag) { | |
2635 | case STOP_CONN_RECOVER: | |
2636 | case STOP_CONN_TERM: | |
2637 | iscsi_start_session_recovery(session, conn, flag); | |
8d2860b3 | 2638 | break; |
7996a778 | 2639 | default: |
322d739d MC |
2640 | iscsi_conn_printk(KERN_ERR, conn, |
2641 | "invalid stop flag %d\n", flag); | |
7996a778 MC |
2642 | } |
2643 | } | |
2644 | EXPORT_SYMBOL_GPL(iscsi_conn_stop); | |
2645 | ||
2646 | int iscsi_conn_bind(struct iscsi_cls_session *cls_session, | |
2647 | struct iscsi_cls_conn *cls_conn, int is_leading) | |
2648 | { | |
75613521 | 2649 | struct iscsi_session *session = cls_session->dd_data; |
98644047 | 2650 | struct iscsi_conn *conn = cls_conn->dd_data; |
7996a778 | 2651 | |
7996a778 | 2652 | spin_lock_bh(&session->lock); |
7996a778 MC |
2653 | if (is_leading) |
2654 | session->leadconn = conn; | |
98644047 | 2655 | spin_unlock_bh(&session->lock); |
7996a778 MC |
2656 | |
2657 | /* | |
2658 | * Unblock xmitworker(), Login Phase will pass through. | |
2659 | */ | |
2660 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
2661 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
2662 | return 0; | |
2663 | } | |
2664 | EXPORT_SYMBOL_GPL(iscsi_conn_bind); | |
2665 | ||
5700b1af MC |
2666 | static int iscsi_switch_str_param(char **param, char *new_val_buf) |
2667 | { | |
2668 | char *new_val; | |
2669 | ||
2670 | if (*param) { | |
2671 | if (!strcmp(*param, new_val_buf)) | |
2672 | return 0; | |
2673 | } | |
2674 | ||
2675 | new_val = kstrdup(new_val_buf, GFP_NOIO); | |
2676 | if (!new_val) | |
2677 | return -ENOMEM; | |
2678 | ||
2679 | kfree(*param); | |
2680 | *param = new_val; | |
2681 | return 0; | |
2682 | } | |
a54a52ca MC |
2683 | |
2684 | int iscsi_set_param(struct iscsi_cls_conn *cls_conn, | |
2685 | enum iscsi_param param, char *buf, int buflen) | |
2686 | { | |
2687 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2688 | struct iscsi_session *session = conn->session; | |
2689 | uint32_t value; | |
2690 | ||
2691 | switch(param) { | |
843c0a8a MC |
2692 | case ISCSI_PARAM_FAST_ABORT: |
2693 | sscanf(buf, "%d", &session->fast_abort); | |
2694 | break; | |
f6d5180c MC |
2695 | case ISCSI_PARAM_ABORT_TMO: |
2696 | sscanf(buf, "%d", &session->abort_timeout); | |
2697 | break; | |
2698 | case ISCSI_PARAM_LU_RESET_TMO: | |
2699 | sscanf(buf, "%d", &session->lu_reset_timeout); | |
2700 | break; | |
2701 | case ISCSI_PARAM_PING_TMO: | |
2702 | sscanf(buf, "%d", &conn->ping_timeout); | |
2703 | break; | |
2704 | case ISCSI_PARAM_RECV_TMO: | |
2705 | sscanf(buf, "%d", &conn->recv_timeout); | |
2706 | break; | |
a54a52ca MC |
2707 | case ISCSI_PARAM_MAX_RECV_DLENGTH: |
2708 | sscanf(buf, "%d", &conn->max_recv_dlength); | |
2709 | break; | |
2710 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
2711 | sscanf(buf, "%d", &conn->max_xmit_dlength); | |
2712 | break; | |
2713 | case ISCSI_PARAM_HDRDGST_EN: | |
2714 | sscanf(buf, "%d", &conn->hdrdgst_en); | |
2715 | break; | |
2716 | case ISCSI_PARAM_DATADGST_EN: | |
2717 | sscanf(buf, "%d", &conn->datadgst_en); | |
2718 | break; | |
2719 | case ISCSI_PARAM_INITIAL_R2T_EN: | |
2720 | sscanf(buf, "%d", &session->initial_r2t_en); | |
2721 | break; | |
2722 | case ISCSI_PARAM_MAX_R2T: | |
2723 | sscanf(buf, "%d", &session->max_r2t); | |
2724 | break; | |
2725 | case ISCSI_PARAM_IMM_DATA_EN: | |
2726 | sscanf(buf, "%d", &session->imm_data_en); | |
2727 | break; | |
2728 | case ISCSI_PARAM_FIRST_BURST: | |
2729 | sscanf(buf, "%d", &session->first_burst); | |
2730 | break; | |
2731 | case ISCSI_PARAM_MAX_BURST: | |
2732 | sscanf(buf, "%d", &session->max_burst); | |
2733 | break; | |
2734 | case ISCSI_PARAM_PDU_INORDER_EN: | |
2735 | sscanf(buf, "%d", &session->pdu_inorder_en); | |
2736 | break; | |
2737 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
2738 | sscanf(buf, "%d", &session->dataseq_inorder_en); | |
2739 | break; | |
2740 | case ISCSI_PARAM_ERL: | |
2741 | sscanf(buf, "%d", &session->erl); | |
2742 | break; | |
2743 | case ISCSI_PARAM_IFMARKER_EN: | |
2744 | sscanf(buf, "%d", &value); | |
2745 | BUG_ON(value); | |
2746 | break; | |
2747 | case ISCSI_PARAM_OFMARKER_EN: | |
2748 | sscanf(buf, "%d", &value); | |
2749 | BUG_ON(value); | |
2750 | break; | |
2751 | case ISCSI_PARAM_EXP_STATSN: | |
2752 | sscanf(buf, "%u", &conn->exp_statsn); | |
2753 | break; | |
b2c64167 | 2754 | case ISCSI_PARAM_USERNAME: |
5700b1af | 2755 | return iscsi_switch_str_param(&session->username, buf); |
b2c64167 | 2756 | case ISCSI_PARAM_USERNAME_IN: |
5700b1af | 2757 | return iscsi_switch_str_param(&session->username_in, buf); |
b2c64167 | 2758 | case ISCSI_PARAM_PASSWORD: |
5700b1af | 2759 | return iscsi_switch_str_param(&session->password, buf); |
b2c64167 | 2760 | case ISCSI_PARAM_PASSWORD_IN: |
5700b1af | 2761 | return iscsi_switch_str_param(&session->password_in, buf); |
a54a52ca | 2762 | case ISCSI_PARAM_TARGET_NAME: |
5700b1af | 2763 | return iscsi_switch_str_param(&session->targetname, buf); |
a54a52ca MC |
2764 | case ISCSI_PARAM_TPGT: |
2765 | sscanf(buf, "%d", &session->tpgt); | |
2766 | break; | |
2767 | case ISCSI_PARAM_PERSISTENT_PORT: | |
2768 | sscanf(buf, "%d", &conn->persistent_port); | |
2769 | break; | |
2770 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
5700b1af | 2771 | return iscsi_switch_str_param(&conn->persistent_address, buf); |
88dfd340 | 2772 | case ISCSI_PARAM_IFACE_NAME: |
5700b1af | 2773 | return iscsi_switch_str_param(&session->ifacename, buf); |
88dfd340 | 2774 | case ISCSI_PARAM_INITIATOR_NAME: |
5700b1af | 2775 | return iscsi_switch_str_param(&session->initiatorname, buf); |
a54a52ca MC |
2776 | default: |
2777 | return -ENOSYS; | |
2778 | } | |
2779 | ||
2780 | return 0; | |
2781 | } | |
2782 | EXPORT_SYMBOL_GPL(iscsi_set_param); | |
2783 | ||
2784 | int iscsi_session_get_param(struct iscsi_cls_session *cls_session, | |
2785 | enum iscsi_param param, char *buf) | |
2786 | { | |
75613521 | 2787 | struct iscsi_session *session = cls_session->dd_data; |
a54a52ca MC |
2788 | int len; |
2789 | ||
2790 | switch(param) { | |
843c0a8a MC |
2791 | case ISCSI_PARAM_FAST_ABORT: |
2792 | len = sprintf(buf, "%d\n", session->fast_abort); | |
2793 | break; | |
f6d5180c MC |
2794 | case ISCSI_PARAM_ABORT_TMO: |
2795 | len = sprintf(buf, "%d\n", session->abort_timeout); | |
2796 | break; | |
2797 | case ISCSI_PARAM_LU_RESET_TMO: | |
2798 | len = sprintf(buf, "%d\n", session->lu_reset_timeout); | |
2799 | break; | |
a54a52ca MC |
2800 | case ISCSI_PARAM_INITIAL_R2T_EN: |
2801 | len = sprintf(buf, "%d\n", session->initial_r2t_en); | |
2802 | break; | |
2803 | case ISCSI_PARAM_MAX_R2T: | |
2804 | len = sprintf(buf, "%hu\n", session->max_r2t); | |
2805 | break; | |
2806 | case ISCSI_PARAM_IMM_DATA_EN: | |
2807 | len = sprintf(buf, "%d\n", session->imm_data_en); | |
2808 | break; | |
2809 | case ISCSI_PARAM_FIRST_BURST: | |
2810 | len = sprintf(buf, "%u\n", session->first_burst); | |
2811 | break; | |
2812 | case ISCSI_PARAM_MAX_BURST: | |
2813 | len = sprintf(buf, "%u\n", session->max_burst); | |
2814 | break; | |
2815 | case ISCSI_PARAM_PDU_INORDER_EN: | |
2816 | len = sprintf(buf, "%d\n", session->pdu_inorder_en); | |
2817 | break; | |
2818 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
2819 | len = sprintf(buf, "%d\n", session->dataseq_inorder_en); | |
2820 | break; | |
2821 | case ISCSI_PARAM_ERL: | |
2822 | len = sprintf(buf, "%d\n", session->erl); | |
2823 | break; | |
2824 | case ISCSI_PARAM_TARGET_NAME: | |
2825 | len = sprintf(buf, "%s\n", session->targetname); | |
2826 | break; | |
2827 | case ISCSI_PARAM_TPGT: | |
2828 | len = sprintf(buf, "%d\n", session->tpgt); | |
2829 | break; | |
b2c64167 MC |
2830 | case ISCSI_PARAM_USERNAME: |
2831 | len = sprintf(buf, "%s\n", session->username); | |
2832 | break; | |
2833 | case ISCSI_PARAM_USERNAME_IN: | |
2834 | len = sprintf(buf, "%s\n", session->username_in); | |
2835 | break; | |
2836 | case ISCSI_PARAM_PASSWORD: | |
2837 | len = sprintf(buf, "%s\n", session->password); | |
2838 | break; | |
2839 | case ISCSI_PARAM_PASSWORD_IN: | |
2840 | len = sprintf(buf, "%s\n", session->password_in); | |
2841 | break; | |
88dfd340 MC |
2842 | case ISCSI_PARAM_IFACE_NAME: |
2843 | len = sprintf(buf, "%s\n", session->ifacename); | |
2844 | break; | |
2845 | case ISCSI_PARAM_INITIATOR_NAME: | |
5700b1af | 2846 | len = sprintf(buf, "%s\n", session->initiatorname); |
88dfd340 | 2847 | break; |
a54a52ca MC |
2848 | default: |
2849 | return -ENOSYS; | |
2850 | } | |
2851 | ||
2852 | return len; | |
2853 | } | |
2854 | EXPORT_SYMBOL_GPL(iscsi_session_get_param); | |
2855 | ||
2856 | int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn, | |
2857 | enum iscsi_param param, char *buf) | |
2858 | { | |
2859 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2860 | int len; | |
2861 | ||
2862 | switch(param) { | |
f6d5180c MC |
2863 | case ISCSI_PARAM_PING_TMO: |
2864 | len = sprintf(buf, "%u\n", conn->ping_timeout); | |
2865 | break; | |
2866 | case ISCSI_PARAM_RECV_TMO: | |
2867 | len = sprintf(buf, "%u\n", conn->recv_timeout); | |
2868 | break; | |
a54a52ca MC |
2869 | case ISCSI_PARAM_MAX_RECV_DLENGTH: |
2870 | len = sprintf(buf, "%u\n", conn->max_recv_dlength); | |
2871 | break; | |
2872 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
2873 | len = sprintf(buf, "%u\n", conn->max_xmit_dlength); | |
2874 | break; | |
2875 | case ISCSI_PARAM_HDRDGST_EN: | |
2876 | len = sprintf(buf, "%d\n", conn->hdrdgst_en); | |
2877 | break; | |
2878 | case ISCSI_PARAM_DATADGST_EN: | |
2879 | len = sprintf(buf, "%d\n", conn->datadgst_en); | |
2880 | break; | |
2881 | case ISCSI_PARAM_IFMARKER_EN: | |
2882 | len = sprintf(buf, "%d\n", conn->ifmarker_en); | |
2883 | break; | |
2884 | case ISCSI_PARAM_OFMARKER_EN: | |
2885 | len = sprintf(buf, "%d\n", conn->ofmarker_en); | |
2886 | break; | |
2887 | case ISCSI_PARAM_EXP_STATSN: | |
2888 | len = sprintf(buf, "%u\n", conn->exp_statsn); | |
2889 | break; | |
2890 | case ISCSI_PARAM_PERSISTENT_PORT: | |
2891 | len = sprintf(buf, "%d\n", conn->persistent_port); | |
2892 | break; | |
2893 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
2894 | len = sprintf(buf, "%s\n", conn->persistent_address); | |
2895 | break; | |
2896 | default: | |
2897 | return -ENOSYS; | |
2898 | } | |
2899 | ||
2900 | return len; | |
2901 | } | |
2902 | EXPORT_SYMBOL_GPL(iscsi_conn_get_param); | |
2903 | ||
0801c242 MC |
2904 | int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param, |
2905 | char *buf) | |
2906 | { | |
75613521 | 2907 | struct iscsi_host *ihost = shost_priv(shost); |
0801c242 MC |
2908 | int len; |
2909 | ||
2910 | switch (param) { | |
d8196ed2 | 2911 | case ISCSI_HOST_PARAM_NETDEV_NAME: |
5700b1af | 2912 | len = sprintf(buf, "%s\n", ihost->netdev); |
d8196ed2 | 2913 | break; |
0801c242 | 2914 | case ISCSI_HOST_PARAM_HWADDRESS: |
5700b1af | 2915 | len = sprintf(buf, "%s\n", ihost->hwaddress); |
0801c242 | 2916 | break; |
8ad5781a | 2917 | case ISCSI_HOST_PARAM_INITIATOR_NAME: |
5700b1af | 2918 | len = sprintf(buf, "%s\n", ihost->initiatorname); |
8ad5781a | 2919 | break; |
75613521 | 2920 | case ISCSI_HOST_PARAM_IPADDRESS: |
5700b1af | 2921 | len = sprintf(buf, "%s\n", ihost->local_address); |
88dfd340 | 2922 | break; |
0801c242 MC |
2923 | default: |
2924 | return -ENOSYS; | |
2925 | } | |
2926 | ||
2927 | return len; | |
2928 | } | |
2929 | EXPORT_SYMBOL_GPL(iscsi_host_get_param); | |
2930 | ||
2931 | int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param, | |
2932 | char *buf, int buflen) | |
2933 | { | |
75613521 | 2934 | struct iscsi_host *ihost = shost_priv(shost); |
0801c242 MC |
2935 | |
2936 | switch (param) { | |
d8196ed2 | 2937 | case ISCSI_HOST_PARAM_NETDEV_NAME: |
5700b1af | 2938 | return iscsi_switch_str_param(&ihost->netdev, buf); |
0801c242 | 2939 | case ISCSI_HOST_PARAM_HWADDRESS: |
5700b1af | 2940 | return iscsi_switch_str_param(&ihost->hwaddress, buf); |
8ad5781a | 2941 | case ISCSI_HOST_PARAM_INITIATOR_NAME: |
5700b1af | 2942 | return iscsi_switch_str_param(&ihost->initiatorname, buf); |
0801c242 MC |
2943 | default: |
2944 | return -ENOSYS; | |
2945 | } | |
2946 | ||
2947 | return 0; | |
2948 | } | |
2949 | EXPORT_SYMBOL_GPL(iscsi_host_set_param); | |
2950 | ||
7996a778 MC |
2951 | MODULE_AUTHOR("Mike Christie"); |
2952 | MODULE_DESCRIPTION("iSCSI library functions"); | |
2953 | MODULE_LICENSE("GPL"); |