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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 MC |
548 | else { |
549 | BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE); | |
550 | BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED); | |
551 | ||
3e5c28ad | 552 | if (!__kfifo_get(session->cmdpool.queue, |
9c19a7d0 | 553 | (void*)&task, sizeof(void*))) |
f6d5180c MC |
554 | return NULL; |
555 | } | |
3e5c28ad MC |
556 | /* |
557 | * released in complete pdu for task we expect a response for, and | |
558 | * released by the lld when it has transmitted the task for | |
559 | * pdus we do not expect a response for. | |
560 | */ | |
9c19a7d0 MC |
561 | atomic_set(&task->refcount, 1); |
562 | task->conn = conn; | |
563 | task->sc = NULL; | |
f6d5180c MC |
564 | |
565 | if (data_size) { | |
9c19a7d0 MC |
566 | memcpy(task->data, data, data_size); |
567 | task->data_count = data_size; | |
f6d5180c | 568 | } else |
9c19a7d0 | 569 | task->data_count = 0; |
f6d5180c | 570 | |
184b57c6 MC |
571 | if (conn->session->tt->alloc_pdu) { |
572 | if (conn->session->tt->alloc_pdu(task, hdr->opcode)) { | |
573 | iscsi_conn_printk(KERN_ERR, conn, "Could not allocate " | |
574 | "pdu for mgmt task.\n"); | |
575 | goto requeue_task; | |
576 | } | |
577577da | 577 | } |
184b57c6 | 578 | |
262ef636 | 579 | itt = task->hdr->itt; |
577577da | 580 | task->hdr_len = sizeof(struct iscsi_hdr); |
9c19a7d0 | 581 | memcpy(task->hdr, hdr, sizeof(struct iscsi_hdr)); |
262ef636 MC |
582 | |
583 | if (hdr->itt != RESERVED_ITT) { | |
584 | if (session->tt->parse_pdu_itt) | |
585 | task->hdr->itt = itt; | |
586 | else | |
587 | task->hdr->itt = build_itt(task->itt, | |
588 | task->conn->session->age); | |
589 | } | |
590 | ||
9c19a7d0 MC |
591 | INIT_LIST_HEAD(&task->running); |
592 | list_add_tail(&task->running, &conn->mgmtqueue); | |
052d0144 MC |
593 | |
594 | if (session->tt->caps & CAP_DATA_PATH_OFFLOAD) { | |
577577da MC |
595 | if (iscsi_prep_mgmt_task(conn, task)) |
596 | goto free_task; | |
052d0144 | 597 | |
9c19a7d0 | 598 | if (session->tt->xmit_task(task)) |
577577da | 599 | goto free_task; |
052d0144 MC |
600 | |
601 | } else | |
32ae763e | 602 | iscsi_conn_queue_work(conn); |
052d0144 | 603 | |
9c19a7d0 | 604 | return task; |
577577da MC |
605 | |
606 | free_task: | |
607 | __iscsi_put_task(task); | |
608 | return NULL; | |
609 | ||
610 | requeue_task: | |
611 | if (task != conn->login_task) | |
612 | __kfifo_put(session->cmdpool.queue, (void*)&task, | |
613 | sizeof(void*)); | |
614 | return NULL; | |
f6d5180c MC |
615 | } |
616 | ||
617 | int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr, | |
618 | char *data, uint32_t data_size) | |
619 | { | |
620 | struct iscsi_conn *conn = cls_conn->dd_data; | |
621 | struct iscsi_session *session = conn->session; | |
622 | int err = 0; | |
623 | ||
624 | spin_lock_bh(&session->lock); | |
625 | if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size)) | |
626 | err = -EPERM; | |
627 | spin_unlock_bh(&session->lock); | |
f6d5180c MC |
628 | return err; |
629 | } | |
630 | EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu); | |
631 | ||
7996a778 MC |
632 | /** |
633 | * iscsi_cmd_rsp - SCSI Command Response processing | |
634 | * @conn: iscsi connection | |
635 | * @hdr: iscsi header | |
9c19a7d0 | 636 | * @task: scsi command task |
7996a778 MC |
637 | * @data: cmd data buffer |
638 | * @datalen: len of buffer | |
639 | * | |
640 | * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and | |
9c19a7d0 | 641 | * then completes the command and task. |
7996a778 | 642 | **/ |
77a23c21 | 643 | static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
9c19a7d0 | 644 | struct iscsi_task *task, char *data, |
77a23c21 | 645 | int datalen) |
7996a778 | 646 | { |
7996a778 MC |
647 | struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)hdr; |
648 | struct iscsi_session *session = conn->session; | |
9c19a7d0 | 649 | struct scsi_cmnd *sc = task->sc; |
7996a778 | 650 | |
77a23c21 | 651 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr); |
7996a778 MC |
652 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; |
653 | ||
654 | sc->result = (DID_OK << 16) | rhdr->cmd_status; | |
655 | ||
656 | if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) { | |
657 | sc->result = DID_ERROR << 16; | |
658 | goto out; | |
659 | } | |
660 | ||
661 | if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) { | |
9b80cb4b | 662 | uint16_t senselen; |
7996a778 MC |
663 | |
664 | if (datalen < 2) { | |
665 | invalid_datalen: | |
322d739d MC |
666 | iscsi_conn_printk(KERN_ERR, conn, |
667 | "Got CHECK_CONDITION but invalid data " | |
668 | "buffer size of %d\n", datalen); | |
7996a778 MC |
669 | sc->result = DID_BAD_TARGET << 16; |
670 | goto out; | |
671 | } | |
672 | ||
8f333991 | 673 | senselen = get_unaligned_be16(data); |
7996a778 MC |
674 | if (datalen < senselen) |
675 | goto invalid_datalen; | |
676 | ||
677 | memcpy(sc->sense_buffer, data + 2, | |
9b80cb4b | 678 | min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE)); |
1b2c7af8 MC |
679 | ISCSI_DBG_SESSION(session, "copied %d bytes of sense\n", |
680 | min_t(uint16_t, senselen, | |
681 | SCSI_SENSE_BUFFERSIZE)); | |
7996a778 MC |
682 | } |
683 | ||
c07d4444 BH |
684 | if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW | |
685 | ISCSI_FLAG_CMD_BIDI_OVERFLOW)) { | |
686 | int res_count = be32_to_cpu(rhdr->bi_residual_count); | |
687 | ||
688 | if (scsi_bidi_cmnd(sc) && res_count > 0 && | |
689 | (rhdr->flags & ISCSI_FLAG_CMD_BIDI_OVERFLOW || | |
690 | res_count <= scsi_in(sc)->length)) | |
691 | scsi_in(sc)->resid = res_count; | |
692 | else | |
693 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
694 | } | |
695 | ||
7207fea4 BH |
696 | if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW | |
697 | ISCSI_FLAG_CMD_OVERFLOW)) { | |
7996a778 MC |
698 | int res_count = be32_to_cpu(rhdr->residual_count); |
699 | ||
7207fea4 BH |
700 | if (res_count > 0 && |
701 | (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || | |
702 | res_count <= scsi_bufflen(sc))) | |
c07d4444 | 703 | /* write side for bidi or uni-io set_resid */ |
1c138991 | 704 | scsi_set_resid(sc, res_count); |
7996a778 MC |
705 | else |
706 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
c07d4444 | 707 | } |
7996a778 | 708 | out: |
1b2c7af8 MC |
709 | ISCSI_DBG_SESSION(session, "done [sc %p res %d itt 0x%x]\n", |
710 | sc, sc->result, task->itt); | |
7996a778 MC |
711 | conn->scsirsp_pdus_cnt++; |
712 | ||
9c19a7d0 | 713 | __iscsi_put_task(task); |
7996a778 MC |
714 | } |
715 | ||
1d9edf02 MC |
716 | /** |
717 | * iscsi_data_in_rsp - SCSI Data-In Response processing | |
718 | * @conn: iscsi connection | |
719 | * @hdr: iscsi pdu | |
720 | * @task: scsi command task | |
721 | **/ | |
722 | static void | |
723 | iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
724 | struct iscsi_task *task) | |
725 | { | |
726 | struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)hdr; | |
727 | struct scsi_cmnd *sc = task->sc; | |
728 | ||
729 | if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS)) | |
730 | return; | |
731 | ||
732 | sc->result = (DID_OK << 16) | rhdr->cmd_status; | |
733 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; | |
734 | if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW | | |
735 | ISCSI_FLAG_DATA_OVERFLOW)) { | |
736 | int res_count = be32_to_cpu(rhdr->residual_count); | |
737 | ||
738 | if (res_count > 0 && | |
739 | (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || | |
740 | res_count <= scsi_in(sc)->length)) | |
741 | scsi_in(sc)->resid = res_count; | |
742 | else | |
743 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
744 | } | |
745 | ||
746 | conn->scsirsp_pdus_cnt++; | |
747 | __iscsi_put_task(task); | |
748 | } | |
749 | ||
7ea8b828 MC |
750 | static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr) |
751 | { | |
752 | struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr; | |
753 | ||
754 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
755 | conn->tmfrsp_pdus_cnt++; | |
756 | ||
843c0a8a | 757 | if (conn->tmf_state != TMF_QUEUED) |
7ea8b828 MC |
758 | return; |
759 | ||
760 | if (tmf->response == ISCSI_TMF_RSP_COMPLETE) | |
843c0a8a | 761 | conn->tmf_state = TMF_SUCCESS; |
7ea8b828 | 762 | else if (tmf->response == ISCSI_TMF_RSP_NO_TASK) |
843c0a8a | 763 | conn->tmf_state = TMF_NOT_FOUND; |
7ea8b828 | 764 | else |
843c0a8a | 765 | conn->tmf_state = TMF_FAILED; |
7ea8b828 MC |
766 | wake_up(&conn->ehwait); |
767 | } | |
768 | ||
f6d5180c MC |
769 | static void iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr) |
770 | { | |
771 | struct iscsi_nopout hdr; | |
9c19a7d0 | 772 | struct iscsi_task *task; |
f6d5180c | 773 | |
9c19a7d0 | 774 | if (!rhdr && conn->ping_task) |
f6d5180c MC |
775 | return; |
776 | ||
777 | memset(&hdr, 0, sizeof(struct iscsi_nopout)); | |
778 | hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE; | |
779 | hdr.flags = ISCSI_FLAG_CMD_FINAL; | |
780 | ||
781 | if (rhdr) { | |
782 | memcpy(hdr.lun, rhdr->lun, 8); | |
783 | hdr.ttt = rhdr->ttt; | |
784 | hdr.itt = RESERVED_ITT; | |
785 | } else | |
786 | hdr.ttt = RESERVED_ITT; | |
787 | ||
9c19a7d0 MC |
788 | task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0); |
789 | if (!task) | |
322d739d | 790 | iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n"); |
d3acf022 MC |
791 | else if (!rhdr) { |
792 | /* only track our nops */ | |
793 | conn->ping_task = task; | |
794 | conn->last_ping = jiffies; | |
795 | } | |
f6d5180c MC |
796 | } |
797 | ||
62f38300 MC |
798 | static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
799 | char *data, int datalen) | |
800 | { | |
801 | struct iscsi_reject *reject = (struct iscsi_reject *)hdr; | |
802 | struct iscsi_hdr rejected_pdu; | |
62f38300 MC |
803 | |
804 | conn->exp_statsn = be32_to_cpu(reject->statsn) + 1; | |
805 | ||
806 | if (reject->reason == ISCSI_REASON_DATA_DIGEST_ERROR) { | |
807 | if (ntoh24(reject->dlength) > datalen) | |
808 | return ISCSI_ERR_PROTO; | |
809 | ||
810 | if (ntoh24(reject->dlength) >= sizeof(struct iscsi_hdr)) { | |
811 | memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr)); | |
322d739d | 812 | iscsi_conn_printk(KERN_ERR, conn, |
262ef636 MC |
813 | "pdu (op 0x%x) rejected " |
814 | "due to DataDigest error.\n", | |
322d739d | 815 | rejected_pdu.opcode); |
62f38300 MC |
816 | } |
817 | } | |
818 | return 0; | |
819 | } | |
820 | ||
913e5bf4 MC |
821 | /** |
822 | * iscsi_itt_to_task - look up task by itt | |
823 | * @conn: iscsi connection | |
824 | * @itt: itt | |
825 | * | |
826 | * This should be used for mgmt tasks like login and nops, or if | |
827 | * the LDD's itt space does not include the session age. | |
828 | * | |
829 | * The session lock must be held. | |
830 | */ | |
831 | static struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *conn, itt_t itt) | |
832 | { | |
833 | struct iscsi_session *session = conn->session; | |
262ef636 | 834 | int i; |
913e5bf4 MC |
835 | |
836 | if (itt == RESERVED_ITT) | |
837 | return NULL; | |
838 | ||
262ef636 MC |
839 | if (session->tt->parse_pdu_itt) |
840 | session->tt->parse_pdu_itt(conn, itt, &i, NULL); | |
841 | else | |
842 | i = get_itt(itt); | |
913e5bf4 MC |
843 | if (i >= session->cmds_max) |
844 | return NULL; | |
845 | ||
846 | return session->cmds[i]; | |
847 | } | |
848 | ||
7996a778 MC |
849 | /** |
850 | * __iscsi_complete_pdu - complete pdu | |
851 | * @conn: iscsi conn | |
852 | * @hdr: iscsi header | |
853 | * @data: data buffer | |
854 | * @datalen: len of data buffer | |
855 | * | |
856 | * Completes pdu processing by freeing any resources allocated at | |
857 | * queuecommand or send generic. session lock must be held and verify | |
858 | * itt must have been called. | |
859 | */ | |
913e5bf4 MC |
860 | int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
861 | char *data, int datalen) | |
7996a778 MC |
862 | { |
863 | struct iscsi_session *session = conn->session; | |
864 | int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0; | |
9c19a7d0 | 865 | struct iscsi_task *task; |
7996a778 MC |
866 | uint32_t itt; |
867 | ||
f6d5180c | 868 | conn->last_recv = jiffies; |
0af967f5 MC |
869 | rc = iscsi_verify_itt(conn, hdr->itt); |
870 | if (rc) | |
871 | return rc; | |
872 | ||
b4377356 AV |
873 | if (hdr->itt != RESERVED_ITT) |
874 | itt = get_itt(hdr->itt); | |
7996a778 | 875 | else |
b4377356 | 876 | itt = ~0U; |
7996a778 | 877 | |
1b2c7af8 MC |
878 | ISCSI_DBG_SESSION(session, "[op 0x%x cid %d itt 0x%x len %d]\n", |
879 | opcode, conn->id, itt, datalen); | |
7996a778 | 880 | |
3e5c28ad | 881 | if (itt == ~0U) { |
77a23c21 | 882 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); |
62f38300 | 883 | |
7996a778 MC |
884 | switch(opcode) { |
885 | case ISCSI_OP_NOOP_IN: | |
40527afe | 886 | if (datalen) { |
7996a778 | 887 | rc = ISCSI_ERR_PROTO; |
40527afe MC |
888 | break; |
889 | } | |
890 | ||
b4377356 | 891 | if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG)) |
40527afe MC |
892 | break; |
893 | ||
f6d5180c | 894 | iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr); |
7996a778 MC |
895 | break; |
896 | case ISCSI_OP_REJECT: | |
62f38300 MC |
897 | rc = iscsi_handle_reject(conn, hdr, data, datalen); |
898 | break; | |
7996a778 | 899 | case ISCSI_OP_ASYNC_EVENT: |
8d2860b3 | 900 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; |
5831c737 MC |
901 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) |
902 | rc = ISCSI_ERR_CONN_FAILED; | |
7996a778 MC |
903 | break; |
904 | default: | |
905 | rc = ISCSI_ERR_BAD_OPCODE; | |
906 | break; | |
907 | } | |
3e5c28ad MC |
908 | goto out; |
909 | } | |
910 | ||
3e5c28ad MC |
911 | switch(opcode) { |
912 | case ISCSI_OP_SCSI_CMD_RSP: | |
913e5bf4 MC |
913 | case ISCSI_OP_SCSI_DATA_IN: |
914 | task = iscsi_itt_to_ctask(conn, hdr->itt); | |
915 | if (!task) | |
916 | return ISCSI_ERR_BAD_ITT; | |
917 | break; | |
918 | case ISCSI_OP_R2T: | |
919 | /* | |
920 | * LLD handles R2Ts if they need to. | |
921 | */ | |
922 | return 0; | |
923 | case ISCSI_OP_LOGOUT_RSP: | |
924 | case ISCSI_OP_LOGIN_RSP: | |
925 | case ISCSI_OP_TEXT_RSP: | |
926 | case ISCSI_OP_SCSI_TMFUNC_RSP: | |
927 | case ISCSI_OP_NOOP_IN: | |
928 | task = iscsi_itt_to_task(conn, hdr->itt); | |
929 | if (!task) | |
930 | return ISCSI_ERR_BAD_ITT; | |
931 | break; | |
932 | default: | |
933 | return ISCSI_ERR_BAD_OPCODE; | |
934 | } | |
935 | ||
936 | switch(opcode) { | |
937 | case ISCSI_OP_SCSI_CMD_RSP: | |
9c19a7d0 | 938 | iscsi_scsi_cmd_rsp(conn, hdr, task, data, datalen); |
3e5c28ad MC |
939 | break; |
940 | case ISCSI_OP_SCSI_DATA_IN: | |
1d9edf02 | 941 | iscsi_data_in_rsp(conn, hdr, task); |
3e5c28ad | 942 | break; |
3e5c28ad MC |
943 | case ISCSI_OP_LOGOUT_RSP: |
944 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
945 | if (datalen) { | |
946 | rc = ISCSI_ERR_PROTO; | |
947 | break; | |
948 | } | |
949 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
950 | goto recv_pdu; | |
951 | case ISCSI_OP_LOGIN_RSP: | |
952 | case ISCSI_OP_TEXT_RSP: | |
953 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
954 | /* | |
955 | * login related PDU's exp_statsn is handled in | |
956 | * userspace | |
957 | */ | |
958 | goto recv_pdu; | |
959 | case ISCSI_OP_SCSI_TMFUNC_RSP: | |
960 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
961 | if (datalen) { | |
962 | rc = ISCSI_ERR_PROTO; | |
963 | break; | |
964 | } | |
965 | ||
966 | iscsi_tmf_rsp(conn, hdr); | |
9c19a7d0 | 967 | __iscsi_put_task(task); |
3e5c28ad MC |
968 | break; |
969 | case ISCSI_OP_NOOP_IN: | |
970 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
971 | if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) { | |
972 | rc = ISCSI_ERR_PROTO; | |
973 | break; | |
974 | } | |
975 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
976 | ||
9c19a7d0 | 977 | if (conn->ping_task != task) |
3e5c28ad MC |
978 | /* |
979 | * If this is not in response to one of our | |
980 | * nops then it must be from userspace. | |
981 | */ | |
982 | goto recv_pdu; | |
9c19a7d0 MC |
983 | |
984 | mod_timer(&conn->transport_timer, jiffies + conn->recv_timeout); | |
985 | __iscsi_put_task(task); | |
3e5c28ad MC |
986 | break; |
987 | default: | |
988 | rc = ISCSI_ERR_BAD_OPCODE; | |
989 | break; | |
990 | } | |
7996a778 | 991 | |
3e5c28ad MC |
992 | out: |
993 | return rc; | |
994 | recv_pdu: | |
995 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) | |
996 | rc = ISCSI_ERR_CONN_FAILED; | |
9c19a7d0 | 997 | __iscsi_put_task(task); |
7996a778 MC |
998 | return rc; |
999 | } | |
913e5bf4 | 1000 | EXPORT_SYMBOL_GPL(__iscsi_complete_pdu); |
7996a778 MC |
1001 | |
1002 | int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
1003 | char *data, int datalen) | |
1004 | { | |
1005 | int rc; | |
1006 | ||
1007 | spin_lock(&conn->session->lock); | |
1008 | rc = __iscsi_complete_pdu(conn, hdr, data, datalen); | |
1009 | spin_unlock(&conn->session->lock); | |
1010 | return rc; | |
1011 | } | |
1012 | EXPORT_SYMBOL_GPL(iscsi_complete_pdu); | |
1013 | ||
0af967f5 | 1014 | int iscsi_verify_itt(struct iscsi_conn *conn, itt_t itt) |
7996a778 MC |
1015 | { |
1016 | struct iscsi_session *session = conn->session; | |
262ef636 | 1017 | int age = 0, i = 0; |
7996a778 | 1018 | |
0af967f5 MC |
1019 | if (itt == RESERVED_ITT) |
1020 | return 0; | |
7996a778 | 1021 | |
262ef636 MC |
1022 | if (session->tt->parse_pdu_itt) |
1023 | session->tt->parse_pdu_itt(conn, itt, &i, &age); | |
1024 | else { | |
1025 | i = get_itt(itt); | |
1026 | age = ((__force u32)itt >> ISCSI_AGE_SHIFT) & ISCSI_AGE_MASK; | |
1027 | } | |
1028 | ||
1029 | if (age != session->age) { | |
0af967f5 MC |
1030 | iscsi_conn_printk(KERN_ERR, conn, |
1031 | "received itt %x expected session age (%x)\n", | |
913e5bf4 | 1032 | (__force u32)itt, session->age); |
0af967f5 MC |
1033 | return ISCSI_ERR_BAD_ITT; |
1034 | } | |
7996a778 | 1035 | |
3e5c28ad MC |
1036 | if (i >= session->cmds_max) { |
1037 | iscsi_conn_printk(KERN_ERR, conn, | |
1038 | "received invalid itt index %u (max cmds " | |
1039 | "%u.\n", i, session->cmds_max); | |
1040 | return ISCSI_ERR_BAD_ITT; | |
7996a778 | 1041 | } |
7996a778 MC |
1042 | return 0; |
1043 | } | |
1044 | EXPORT_SYMBOL_GPL(iscsi_verify_itt); | |
1045 | ||
913e5bf4 MC |
1046 | /** |
1047 | * iscsi_itt_to_ctask - look up ctask by itt | |
1048 | * @conn: iscsi connection | |
1049 | * @itt: itt | |
1050 | * | |
1051 | * This should be used for cmd tasks. | |
1052 | * | |
1053 | * The session lock must be held. | |
1054 | */ | |
1055 | struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *conn, itt_t itt) | |
0af967f5 | 1056 | { |
9c19a7d0 | 1057 | struct iscsi_task *task; |
0af967f5 MC |
1058 | |
1059 | if (iscsi_verify_itt(conn, itt)) | |
1060 | return NULL; | |
1061 | ||
913e5bf4 MC |
1062 | task = iscsi_itt_to_task(conn, itt); |
1063 | if (!task || !task->sc) | |
0af967f5 MC |
1064 | return NULL; |
1065 | ||
913e5bf4 MC |
1066 | if (task->sc->SCp.phase != conn->session->age) { |
1067 | iscsi_session_printk(KERN_ERR, conn->session, | |
1068 | "task's session age %d, expected %d\n", | |
1069 | task->sc->SCp.phase, conn->session->age); | |
0af967f5 | 1070 | return NULL; |
913e5bf4 | 1071 | } |
0af967f5 | 1072 | |
9c19a7d0 | 1073 | return task; |
0af967f5 MC |
1074 | } |
1075 | EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask); | |
1076 | ||
40a06e75 | 1077 | void iscsi_session_failure(struct iscsi_session *session, |
e5bd7b54 MC |
1078 | enum iscsi_err err) |
1079 | { | |
e5bd7b54 MC |
1080 | struct iscsi_conn *conn; |
1081 | struct device *dev; | |
1082 | unsigned long flags; | |
1083 | ||
1084 | spin_lock_irqsave(&session->lock, flags); | |
1085 | conn = session->leadconn; | |
1086 | if (session->state == ISCSI_STATE_TERMINATE || !conn) { | |
1087 | spin_unlock_irqrestore(&session->lock, flags); | |
1088 | return; | |
1089 | } | |
1090 | ||
1091 | dev = get_device(&conn->cls_conn->dev); | |
1092 | spin_unlock_irqrestore(&session->lock, flags); | |
1093 | if (!dev) | |
1094 | return; | |
1095 | /* | |
1096 | * if the host is being removed bypass the connection | |
1097 | * recovery initialization because we are going to kill | |
1098 | * the session. | |
1099 | */ | |
1100 | if (err == ISCSI_ERR_INVALID_HOST) | |
1101 | iscsi_conn_error_event(conn->cls_conn, err); | |
1102 | else | |
1103 | iscsi_conn_failure(conn, err); | |
1104 | put_device(dev); | |
1105 | } | |
1106 | EXPORT_SYMBOL_GPL(iscsi_session_failure); | |
1107 | ||
7996a778 MC |
1108 | void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err) |
1109 | { | |
1110 | struct iscsi_session *session = conn->session; | |
1111 | unsigned long flags; | |
1112 | ||
1113 | spin_lock_irqsave(&session->lock, flags); | |
656cffc9 MC |
1114 | if (session->state == ISCSI_STATE_FAILED) { |
1115 | spin_unlock_irqrestore(&session->lock, flags); | |
1116 | return; | |
1117 | } | |
1118 | ||
67a61114 | 1119 | if (conn->stop_stage == 0) |
7996a778 MC |
1120 | session->state = ISCSI_STATE_FAILED; |
1121 | spin_unlock_irqrestore(&session->lock, flags); | |
e5bd7b54 | 1122 | |
7996a778 MC |
1123 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); |
1124 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
e5bd7b54 | 1125 | iscsi_conn_error_event(conn->cls_conn, err); |
7996a778 MC |
1126 | } |
1127 | EXPORT_SYMBOL_GPL(iscsi_conn_failure); | |
1128 | ||
77a23c21 MC |
1129 | static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn) |
1130 | { | |
1131 | struct iscsi_session *session = conn->session; | |
1132 | ||
1133 | /* | |
1134 | * Check for iSCSI window and take care of CmdSN wrap-around | |
1135 | */ | |
e0726407 | 1136 | if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) { |
1b2c7af8 MC |
1137 | ISCSI_DBG_SESSION(session, "iSCSI CmdSN closed. ExpCmdSn " |
1138 | "%u MaxCmdSN %u CmdSN %u/%u\n", | |
1139 | session->exp_cmdsn, session->max_cmdsn, | |
1140 | session->cmdsn, session->queued_cmdsn); | |
77a23c21 MC |
1141 | return -ENOSPC; |
1142 | } | |
1143 | return 0; | |
1144 | } | |
1145 | ||
9c19a7d0 | 1146 | static int iscsi_xmit_task(struct iscsi_conn *conn) |
77a23c21 | 1147 | { |
9c19a7d0 | 1148 | struct iscsi_task *task = conn->task; |
843c0a8a | 1149 | int rc; |
77a23c21 | 1150 | |
9c19a7d0 | 1151 | __iscsi_get_task(task); |
77a23c21 | 1152 | spin_unlock_bh(&conn->session->lock); |
9c19a7d0 | 1153 | rc = conn->session->tt->xmit_task(task); |
77a23c21 | 1154 | spin_lock_bh(&conn->session->lock); |
9c19a7d0 | 1155 | __iscsi_put_task(task); |
77a23c21 | 1156 | if (!rc) |
9c19a7d0 MC |
1157 | /* done with this task */ |
1158 | conn->task = NULL; | |
77a23c21 MC |
1159 | return rc; |
1160 | } | |
1161 | ||
843c0a8a | 1162 | /** |
9c19a7d0 MC |
1163 | * iscsi_requeue_task - requeue task to run from session workqueue |
1164 | * @task: task to requeue | |
843c0a8a | 1165 | * |
9c19a7d0 | 1166 | * LLDs that need to run a task from the session workqueue should call |
052d0144 MC |
1167 | * this. The session lock must be held. This should only be called |
1168 | * by software drivers. | |
843c0a8a | 1169 | */ |
9c19a7d0 | 1170 | void iscsi_requeue_task(struct iscsi_task *task) |
843c0a8a | 1171 | { |
9c19a7d0 | 1172 | struct iscsi_conn *conn = task->conn; |
843c0a8a | 1173 | |
9c19a7d0 | 1174 | list_move_tail(&task->running, &conn->requeue); |
32ae763e | 1175 | iscsi_conn_queue_work(conn); |
843c0a8a | 1176 | } |
9c19a7d0 | 1177 | EXPORT_SYMBOL_GPL(iscsi_requeue_task); |
843c0a8a | 1178 | |
7996a778 MC |
1179 | /** |
1180 | * iscsi_data_xmit - xmit any command into the scheduled connection | |
1181 | * @conn: iscsi connection | |
1182 | * | |
1183 | * Notes: | |
1184 | * The function can return -EAGAIN in which case the caller must | |
1185 | * re-schedule it again later or recover. '0' return code means | |
1186 | * successful xmit. | |
1187 | **/ | |
1188 | static int iscsi_data_xmit(struct iscsi_conn *conn) | |
1189 | { | |
3219e529 | 1190 | int rc = 0; |
7996a778 | 1191 | |
77a23c21 | 1192 | spin_lock_bh(&conn->session->lock); |
7996a778 | 1193 | if (unlikely(conn->suspend_tx)) { |
1b2c7af8 | 1194 | ISCSI_DBG_SESSION(conn->session, "Tx suspended!\n"); |
77a23c21 | 1195 | spin_unlock_bh(&conn->session->lock); |
3219e529 | 1196 | return -ENODATA; |
7996a778 | 1197 | } |
7996a778 | 1198 | |
9c19a7d0 MC |
1199 | if (conn->task) { |
1200 | rc = iscsi_xmit_task(conn); | |
3219e529 | 1201 | if (rc) |
7996a778 | 1202 | goto again; |
7996a778 MC |
1203 | } |
1204 | ||
77a23c21 MC |
1205 | /* |
1206 | * process mgmt pdus like nops before commands since we should | |
1207 | * only have one nop-out as a ping from us and targets should not | |
1208 | * overflow us with nop-ins | |
1209 | */ | |
1210 | check_mgmt: | |
843c0a8a | 1211 | while (!list_empty(&conn->mgmtqueue)) { |
9c19a7d0 MC |
1212 | conn->task = list_entry(conn->mgmtqueue.next, |
1213 | struct iscsi_task, running); | |
1214 | if (iscsi_prep_mgmt_task(conn, conn->task)) { | |
1215 | __iscsi_put_task(conn->task); | |
1216 | conn->task = NULL; | |
b3a7ea8d MC |
1217 | continue; |
1218 | } | |
9c19a7d0 | 1219 | rc = iscsi_xmit_task(conn); |
77a23c21 MC |
1220 | if (rc) |
1221 | goto again; | |
7996a778 MC |
1222 | } |
1223 | ||
843c0a8a | 1224 | /* process pending command queue */ |
b6c395ed | 1225 | while (!list_empty(&conn->xmitqueue)) { |
843c0a8a MC |
1226 | if (conn->tmf_state == TMF_QUEUED) |
1227 | break; | |
1228 | ||
9c19a7d0 MC |
1229 | conn->task = list_entry(conn->xmitqueue.next, |
1230 | struct iscsi_task, running); | |
b3a7ea8d | 1231 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) { |
9c19a7d0 | 1232 | fail_command(conn, conn->task, DID_IMM_RETRY << 16); |
b3a7ea8d MC |
1233 | continue; |
1234 | } | |
577577da MC |
1235 | rc = iscsi_prep_scsi_cmd_pdu(conn->task); |
1236 | if (rc) { | |
1237 | if (rc == -ENOMEM) { | |
1238 | conn->task = NULL; | |
1239 | goto again; | |
1240 | } else | |
1241 | fail_command(conn, conn->task, DID_ABORT << 16); | |
004d6530 BH |
1242 | continue; |
1243 | } | |
9c19a7d0 | 1244 | rc = iscsi_xmit_task(conn); |
77a23c21 | 1245 | if (rc) |
60ecebf5 | 1246 | goto again; |
77a23c21 | 1247 | /* |
9c19a7d0 | 1248 | * we could continuously get new task requests so |
77a23c21 MC |
1249 | * we need to check the mgmt queue for nops that need to |
1250 | * be sent to aviod starvation | |
1251 | */ | |
843c0a8a MC |
1252 | if (!list_empty(&conn->mgmtqueue)) |
1253 | goto check_mgmt; | |
1254 | } | |
1255 | ||
1256 | while (!list_empty(&conn->requeue)) { | |
1257 | if (conn->session->fast_abort && conn->tmf_state != TMF_INITIAL) | |
1258 | break; | |
1259 | ||
b3a7ea8d MC |
1260 | /* |
1261 | * we always do fastlogout - conn stop code will clean up. | |
1262 | */ | |
1263 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) | |
1264 | break; | |
1265 | ||
9c19a7d0 MC |
1266 | conn->task = list_entry(conn->requeue.next, |
1267 | struct iscsi_task, running); | |
1268 | conn->task->state = ISCSI_TASK_RUNNING; | |
843c0a8a | 1269 | list_move_tail(conn->requeue.next, &conn->run_list); |
9c19a7d0 | 1270 | rc = iscsi_xmit_task(conn); |
843c0a8a MC |
1271 | if (rc) |
1272 | goto again; | |
1273 | if (!list_empty(&conn->mgmtqueue)) | |
77a23c21 | 1274 | goto check_mgmt; |
7996a778 | 1275 | } |
b6c395ed | 1276 | spin_unlock_bh(&conn->session->lock); |
3219e529 | 1277 | return -ENODATA; |
7996a778 MC |
1278 | |
1279 | again: | |
1280 | if (unlikely(conn->suspend_tx)) | |
77a23c21 MC |
1281 | rc = -ENODATA; |
1282 | spin_unlock_bh(&conn->session->lock); | |
3219e529 | 1283 | return rc; |
7996a778 MC |
1284 | } |
1285 | ||
c4028958 | 1286 | static void iscsi_xmitworker(struct work_struct *work) |
7996a778 | 1287 | { |
c4028958 DH |
1288 | struct iscsi_conn *conn = |
1289 | container_of(work, struct iscsi_conn, xmitwork); | |
3219e529 | 1290 | int rc; |
7996a778 MC |
1291 | /* |
1292 | * serialize Xmit worker on a per-connection basis. | |
1293 | */ | |
3219e529 MC |
1294 | do { |
1295 | rc = iscsi_data_xmit(conn); | |
1296 | } while (rc >= 0 || rc == -EAGAIN); | |
7996a778 MC |
1297 | } |
1298 | ||
577577da MC |
1299 | static inline struct iscsi_task *iscsi_alloc_task(struct iscsi_conn *conn, |
1300 | struct scsi_cmnd *sc) | |
1301 | { | |
1302 | struct iscsi_task *task; | |
1303 | ||
1304 | if (!__kfifo_get(conn->session->cmdpool.queue, | |
1305 | (void *) &task, sizeof(void *))) | |
1306 | return NULL; | |
1307 | ||
1308 | sc->SCp.phase = conn->session->age; | |
1309 | sc->SCp.ptr = (char *) task; | |
1310 | ||
1311 | atomic_set(&task->refcount, 1); | |
1312 | task->state = ISCSI_TASK_PENDING; | |
1313 | task->conn = conn; | |
1314 | task->sc = sc; | |
1315 | INIT_LIST_HEAD(&task->running); | |
1316 | return task; | |
1317 | } | |
1318 | ||
7996a778 MC |
1319 | enum { |
1320 | FAILURE_BAD_HOST = 1, | |
1321 | FAILURE_SESSION_FAILED, | |
1322 | FAILURE_SESSION_FREED, | |
1323 | FAILURE_WINDOW_CLOSED, | |
60ecebf5 | 1324 | FAILURE_OOM, |
7996a778 | 1325 | FAILURE_SESSION_TERMINATE, |
656cffc9 | 1326 | FAILURE_SESSION_IN_RECOVERY, |
7996a778 | 1327 | FAILURE_SESSION_RECOVERY_TIMEOUT, |
b3a7ea8d | 1328 | FAILURE_SESSION_LOGGING_OUT, |
6eabafbe | 1329 | FAILURE_SESSION_NOT_READY, |
7996a778 MC |
1330 | }; |
1331 | ||
1332 | int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *)) | |
1333 | { | |
75613521 | 1334 | struct iscsi_cls_session *cls_session; |
7996a778 MC |
1335 | struct Scsi_Host *host; |
1336 | int reason = 0; | |
1337 | struct iscsi_session *session; | |
1338 | struct iscsi_conn *conn; | |
9c19a7d0 | 1339 | struct iscsi_task *task = NULL; |
7996a778 MC |
1340 | |
1341 | sc->scsi_done = done; | |
1342 | sc->result = 0; | |
f47f2cf5 | 1343 | sc->SCp.ptr = NULL; |
7996a778 MC |
1344 | |
1345 | host = sc->device->host; | |
1040c99d | 1346 | spin_unlock(host->host_lock); |
7996a778 | 1347 | |
75613521 MC |
1348 | cls_session = starget_to_session(scsi_target(sc->device)); |
1349 | session = cls_session->dd_data; | |
7996a778 MC |
1350 | spin_lock(&session->lock); |
1351 | ||
75613521 | 1352 | reason = iscsi_session_chkready(cls_session); |
6eabafbe MC |
1353 | if (reason) { |
1354 | sc->result = reason; | |
1355 | goto fault; | |
1356 | } | |
1357 | ||
656cffc9 MC |
1358 | /* |
1359 | * ISCSI_STATE_FAILED is a temp. state. The recovery | |
1360 | * code will decide what is best to do with command queued | |
1361 | * during this time | |
1362 | */ | |
1363 | if (session->state != ISCSI_STATE_LOGGED_IN && | |
1364 | session->state != ISCSI_STATE_FAILED) { | |
1365 | /* | |
1366 | * to handle the race between when we set the recovery state | |
1367 | * and block the session we requeue here (commands could | |
1368 | * be entering our queuecommand while a block is starting | |
1369 | * up because the block code is not locked) | |
1370 | */ | |
9000bcd6 MC |
1371 | switch (session->state) { |
1372 | case ISCSI_STATE_IN_RECOVERY: | |
656cffc9 | 1373 | reason = FAILURE_SESSION_IN_RECOVERY; |
d6d13ee1 | 1374 | goto reject; |
9000bcd6 MC |
1375 | case ISCSI_STATE_LOGGING_OUT: |
1376 | reason = FAILURE_SESSION_LOGGING_OUT; | |
d6d13ee1 | 1377 | goto reject; |
b3a7ea8d | 1378 | case ISCSI_STATE_RECOVERY_FAILED: |
656cffc9 | 1379 | reason = FAILURE_SESSION_RECOVERY_TIMEOUT; |
56d7fcfa | 1380 | sc->result = DID_TRANSPORT_FAILFAST << 16; |
b3a7ea8d MC |
1381 | break; |
1382 | case ISCSI_STATE_TERMINATE: | |
656cffc9 | 1383 | reason = FAILURE_SESSION_TERMINATE; |
6eabafbe | 1384 | sc->result = DID_NO_CONNECT << 16; |
b3a7ea8d | 1385 | break; |
b3a7ea8d | 1386 | default: |
656cffc9 | 1387 | reason = FAILURE_SESSION_FREED; |
6eabafbe | 1388 | sc->result = DID_NO_CONNECT << 16; |
b3a7ea8d | 1389 | } |
7996a778 MC |
1390 | goto fault; |
1391 | } | |
1392 | ||
7996a778 | 1393 | conn = session->leadconn; |
98644047 MC |
1394 | if (!conn) { |
1395 | reason = FAILURE_SESSION_FREED; | |
6eabafbe | 1396 | sc->result = DID_NO_CONNECT << 16; |
98644047 MC |
1397 | goto fault; |
1398 | } | |
7996a778 | 1399 | |
77a23c21 MC |
1400 | if (iscsi_check_cmdsn_window_closed(conn)) { |
1401 | reason = FAILURE_WINDOW_CLOSED; | |
1402 | goto reject; | |
1403 | } | |
1404 | ||
577577da MC |
1405 | task = iscsi_alloc_task(conn, sc); |
1406 | if (!task) { | |
60ecebf5 MC |
1407 | reason = FAILURE_OOM; |
1408 | goto reject; | |
1409 | } | |
9c19a7d0 | 1410 | list_add_tail(&task->running, &conn->xmitqueue); |
7996a778 | 1411 | |
052d0144 | 1412 | if (session->tt->caps & CAP_DATA_PATH_OFFLOAD) { |
577577da MC |
1413 | reason = iscsi_prep_scsi_cmd_pdu(task); |
1414 | if (reason) { | |
1415 | if (reason == -ENOMEM) { | |
1416 | reason = FAILURE_OOM; | |
1417 | goto prepd_reject; | |
1418 | } else { | |
1419 | sc->result = DID_ABORT << 16; | |
1420 | goto prepd_fault; | |
1421 | } | |
052d0144 | 1422 | } |
9c19a7d0 | 1423 | if (session->tt->xmit_task(task)) { |
052d0144 | 1424 | reason = FAILURE_SESSION_NOT_READY; |
577577da | 1425 | goto prepd_reject; |
052d0144 MC |
1426 | } |
1427 | } else | |
32ae763e | 1428 | iscsi_conn_queue_work(conn); |
052d0144 MC |
1429 | |
1430 | session->queued_cmdsn++; | |
1431 | spin_unlock(&session->lock); | |
1040c99d | 1432 | spin_lock(host->host_lock); |
7996a778 MC |
1433 | return 0; |
1434 | ||
577577da MC |
1435 | prepd_reject: |
1436 | sc->scsi_done = NULL; | |
1437 | iscsi_complete_command(task); | |
7996a778 MC |
1438 | reject: |
1439 | spin_unlock(&session->lock); | |
1b2c7af8 MC |
1440 | ISCSI_DBG_SESSION(session, "cmd 0x%x rejected (%d)\n", |
1441 | sc->cmnd[0], reason); | |
1040c99d | 1442 | spin_lock(host->host_lock); |
d6d13ee1 | 1443 | return SCSI_MLQUEUE_TARGET_BUSY; |
7996a778 | 1444 | |
577577da MC |
1445 | prepd_fault: |
1446 | sc->scsi_done = NULL; | |
1447 | iscsi_complete_command(task); | |
7996a778 MC |
1448 | fault: |
1449 | spin_unlock(&session->lock); | |
1b2c7af8 MC |
1450 | ISCSI_DBG_SESSION(session, "iscsi: cmd 0x%x is not queued (%d)\n", |
1451 | sc->cmnd[0], reason); | |
c07d4444 BH |
1452 | if (!scsi_bidi_cmnd(sc)) |
1453 | scsi_set_resid(sc, scsi_bufflen(sc)); | |
1454 | else { | |
1455 | scsi_out(sc)->resid = scsi_out(sc)->length; | |
1456 | scsi_in(sc)->resid = scsi_in(sc)->length; | |
1457 | } | |
052d0144 | 1458 | done(sc); |
1040c99d | 1459 | spin_lock(host->host_lock); |
7996a778 MC |
1460 | return 0; |
1461 | } | |
1462 | EXPORT_SYMBOL_GPL(iscsi_queuecommand); | |
1463 | ||
1464 | int iscsi_change_queue_depth(struct scsi_device *sdev, int depth) | |
1465 | { | |
7996a778 MC |
1466 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); |
1467 | return sdev->queue_depth; | |
1468 | } | |
1469 | EXPORT_SYMBOL_GPL(iscsi_change_queue_depth); | |
1470 | ||
6b5d6c44 MC |
1471 | int iscsi_target_alloc(struct scsi_target *starget) |
1472 | { | |
1473 | struct iscsi_cls_session *cls_session = starget_to_session(starget); | |
1474 | struct iscsi_session *session = cls_session->dd_data; | |
1475 | ||
1476 | starget->can_queue = session->scsi_cmds_max; | |
1477 | return 0; | |
1478 | } | |
1479 | EXPORT_SYMBOL_GPL(iscsi_target_alloc); | |
1480 | ||
7996a778 MC |
1481 | void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session) |
1482 | { | |
75613521 | 1483 | struct iscsi_session *session = cls_session->dd_data; |
7996a778 MC |
1484 | |
1485 | spin_lock_bh(&session->lock); | |
1486 | if (session->state != ISCSI_STATE_LOGGED_IN) { | |
656cffc9 | 1487 | session->state = ISCSI_STATE_RECOVERY_FAILED; |
843c0a8a MC |
1488 | if (session->leadconn) |
1489 | wake_up(&session->leadconn->ehwait); | |
7996a778 MC |
1490 | } |
1491 | spin_unlock_bh(&session->lock); | |
1492 | } | |
1493 | EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout); | |
1494 | ||
8e124525 | 1495 | int iscsi_eh_target_reset(struct scsi_cmnd *sc) |
7996a778 | 1496 | { |
75613521 MC |
1497 | struct iscsi_cls_session *cls_session; |
1498 | struct iscsi_session *session; | |
1499 | struct iscsi_conn *conn; | |
1500 | ||
1501 | cls_session = starget_to_session(scsi_target(sc->device)); | |
1502 | session = cls_session->dd_data; | |
1503 | conn = session->leadconn; | |
7996a778 | 1504 | |
bc436b27 | 1505 | mutex_lock(&session->eh_mutex); |
7996a778 MC |
1506 | spin_lock_bh(&session->lock); |
1507 | if (session->state == ISCSI_STATE_TERMINATE) { | |
1508 | failed: | |
1b2c7af8 MC |
1509 | iscsi_session_printk(KERN_INFO, session, |
1510 | "failing target reset: Could not log " | |
1511 | "back into target [age %d]\n", | |
1512 | session->age); | |
7996a778 | 1513 | spin_unlock_bh(&session->lock); |
bc436b27 | 1514 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1515 | return FAILED; |
1516 | } | |
1517 | ||
7996a778 | 1518 | spin_unlock_bh(&session->lock); |
bc436b27 | 1519 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1520 | /* |
1521 | * we drop the lock here but the leadconn cannot be destoyed while | |
1522 | * we are in the scsi eh | |
1523 | */ | |
843c0a8a | 1524 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
7996a778 | 1525 | |
1b2c7af8 | 1526 | ISCSI_DBG_SESSION(session, "wait for relogin\n"); |
7996a778 MC |
1527 | wait_event_interruptible(conn->ehwait, |
1528 | session->state == ISCSI_STATE_TERMINATE || | |
1529 | session->state == ISCSI_STATE_LOGGED_IN || | |
656cffc9 | 1530 | session->state == ISCSI_STATE_RECOVERY_FAILED); |
7996a778 MC |
1531 | if (signal_pending(current)) |
1532 | flush_signals(current); | |
1533 | ||
bc436b27 | 1534 | mutex_lock(&session->eh_mutex); |
7996a778 MC |
1535 | spin_lock_bh(&session->lock); |
1536 | if (session->state == ISCSI_STATE_LOGGED_IN) | |
322d739d | 1537 | iscsi_session_printk(KERN_INFO, session, |
8e124525 | 1538 | "target reset succeeded\n"); |
7996a778 MC |
1539 | else |
1540 | goto failed; | |
1541 | spin_unlock_bh(&session->lock); | |
bc436b27 | 1542 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1543 | return SUCCESS; |
1544 | } | |
8e124525 | 1545 | EXPORT_SYMBOL_GPL(iscsi_eh_target_reset); |
7996a778 | 1546 | |
843c0a8a | 1547 | static void iscsi_tmf_timedout(unsigned long data) |
7996a778 | 1548 | { |
843c0a8a | 1549 | struct iscsi_conn *conn = (struct iscsi_conn *)data; |
7996a778 MC |
1550 | struct iscsi_session *session = conn->session; |
1551 | ||
1552 | spin_lock(&session->lock); | |
843c0a8a MC |
1553 | if (conn->tmf_state == TMF_QUEUED) { |
1554 | conn->tmf_state = TMF_TIMEDOUT; | |
1b2c7af8 | 1555 | ISCSI_DBG_SESSION(session, "tmf timedout\n"); |
7996a778 MC |
1556 | /* unblock eh_abort() */ |
1557 | wake_up(&conn->ehwait); | |
1558 | } | |
1559 | spin_unlock(&session->lock); | |
1560 | } | |
1561 | ||
9c19a7d0 | 1562 | static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn, |
f6d5180c MC |
1563 | struct iscsi_tm *hdr, int age, |
1564 | int timeout) | |
7996a778 | 1565 | { |
7996a778 | 1566 | struct iscsi_session *session = conn->session; |
9c19a7d0 | 1567 | struct iscsi_task *task; |
7996a778 | 1568 | |
9c19a7d0 | 1569 | task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr, |
843c0a8a | 1570 | NULL, 0); |
9c19a7d0 | 1571 | if (!task) { |
6724add1 | 1572 | spin_unlock_bh(&session->lock); |
7996a778 | 1573 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
843c0a8a | 1574 | spin_lock_bh(&session->lock); |
1b2c7af8 | 1575 | ISCSI_DBG_SESSION(session, "tmf exec failure\n"); |
77a23c21 | 1576 | return -EPERM; |
7996a778 | 1577 | } |
843c0a8a | 1578 | conn->tmfcmd_pdus_cnt++; |
f6d5180c | 1579 | conn->tmf_timer.expires = timeout * HZ + jiffies; |
843c0a8a MC |
1580 | conn->tmf_timer.function = iscsi_tmf_timedout; |
1581 | conn->tmf_timer.data = (unsigned long)conn; | |
1582 | add_timer(&conn->tmf_timer); | |
1b2c7af8 | 1583 | ISCSI_DBG_SESSION(session, "tmf set timeout\n"); |
7996a778 | 1584 | |
7996a778 | 1585 | spin_unlock_bh(&session->lock); |
6724add1 | 1586 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1587 | |
1588 | /* | |
1589 | * block eh thread until: | |
1590 | * | |
843c0a8a MC |
1591 | * 1) tmf response |
1592 | * 2) tmf timeout | |
7996a778 MC |
1593 | * 3) session is terminated or restarted or userspace has |
1594 | * given up on recovery | |
1595 | */ | |
843c0a8a | 1596 | wait_event_interruptible(conn->ehwait, age != session->age || |
7996a778 | 1597 | session->state != ISCSI_STATE_LOGGED_IN || |
843c0a8a | 1598 | conn->tmf_state != TMF_QUEUED); |
7996a778 MC |
1599 | if (signal_pending(current)) |
1600 | flush_signals(current); | |
843c0a8a MC |
1601 | del_timer_sync(&conn->tmf_timer); |
1602 | ||
6724add1 | 1603 | mutex_lock(&session->eh_mutex); |
77a23c21 | 1604 | spin_lock_bh(&session->lock); |
9c19a7d0 | 1605 | /* if the session drops it will clean up the task */ |
843c0a8a MC |
1606 | if (age != session->age || |
1607 | session->state != ISCSI_STATE_LOGGED_IN) | |
1608 | return -ENOTCONN; | |
7996a778 MC |
1609 | return 0; |
1610 | } | |
1611 | ||
843c0a8a MC |
1612 | /* |
1613 | * Fail commands. session lock held and recv side suspended and xmit | |
1614 | * thread flushed | |
1615 | */ | |
6eabafbe MC |
1616 | static void fail_all_commands(struct iscsi_conn *conn, unsigned lun, |
1617 | int error) | |
843c0a8a | 1618 | { |
9c19a7d0 | 1619 | struct iscsi_task *task, *tmp; |
843c0a8a | 1620 | |
72899682 MC |
1621 | if (conn->task) { |
1622 | if (lun == -1 || | |
1623 | (conn->task->sc && conn->task->sc->device->lun == lun)) | |
1624 | conn->task = NULL; | |
1625 | } | |
843c0a8a MC |
1626 | |
1627 | /* flush pending */ | |
9c19a7d0 MC |
1628 | list_for_each_entry_safe(task, tmp, &conn->xmitqueue, running) { |
1629 | if (lun == task->sc->device->lun || lun == -1) { | |
1b2c7af8 MC |
1630 | ISCSI_DBG_SESSION(conn->session, |
1631 | "failing pending sc %p itt 0x%x\n", | |
1632 | task->sc, task->itt); | |
9c19a7d0 | 1633 | fail_command(conn, task, error << 16); |
843c0a8a MC |
1634 | } |
1635 | } | |
1636 | ||
9c19a7d0 MC |
1637 | list_for_each_entry_safe(task, tmp, &conn->requeue, running) { |
1638 | if (lun == task->sc->device->lun || lun == -1) { | |
1b2c7af8 MC |
1639 | ISCSI_DBG_SESSION(conn->session, |
1640 | "failing requeued sc %p itt 0x%x\n", | |
1641 | task->sc, task->itt); | |
9c19a7d0 | 1642 | fail_command(conn, task, error << 16); |
843c0a8a MC |
1643 | } |
1644 | } | |
1645 | ||
1646 | /* fail all other running */ | |
9c19a7d0 MC |
1647 | list_for_each_entry_safe(task, tmp, &conn->run_list, running) { |
1648 | if (lun == task->sc->device->lun || lun == -1) { | |
1b2c7af8 MC |
1649 | ISCSI_DBG_SESSION(conn->session, |
1650 | "failing in progress sc %p itt 0x%x\n", | |
1651 | task->sc, task->itt); | |
ac26d41d | 1652 | fail_command(conn, task, error << 16); |
843c0a8a MC |
1653 | } |
1654 | } | |
1655 | } | |
1656 | ||
b40977d9 | 1657 | void iscsi_suspend_tx(struct iscsi_conn *conn) |
6724add1 | 1658 | { |
32ae763e MC |
1659 | struct Scsi_Host *shost = conn->session->host; |
1660 | struct iscsi_host *ihost = shost_priv(shost); | |
1661 | ||
6724add1 | 1662 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); |
052d0144 | 1663 | if (!(conn->session->tt->caps & CAP_DATA_PATH_OFFLOAD)) |
32ae763e | 1664 | flush_workqueue(ihost->workq); |
6724add1 | 1665 | } |
b40977d9 | 1666 | EXPORT_SYMBOL_GPL(iscsi_suspend_tx); |
6724add1 MC |
1667 | |
1668 | static void iscsi_start_tx(struct iscsi_conn *conn) | |
1669 | { | |
1670 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
052d0144 | 1671 | if (!(conn->session->tt->caps & CAP_DATA_PATH_OFFLOAD)) |
32ae763e | 1672 | iscsi_conn_queue_work(conn); |
6724add1 MC |
1673 | } |
1674 | ||
242f9dcb | 1675 | static enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *scmd) |
f6d5180c MC |
1676 | { |
1677 | struct iscsi_cls_session *cls_session; | |
1678 | struct iscsi_session *session; | |
1679 | struct iscsi_conn *conn; | |
242f9dcb | 1680 | enum blk_eh_timer_return rc = BLK_EH_NOT_HANDLED; |
f6d5180c MC |
1681 | |
1682 | cls_session = starget_to_session(scsi_target(scmd->device)); | |
75613521 | 1683 | session = cls_session->dd_data; |
f6d5180c | 1684 | |
1b2c7af8 | 1685 | ISCSI_DBG_SESSION(session, "scsi cmd %p timedout\n", scmd); |
f6d5180c MC |
1686 | |
1687 | spin_lock(&session->lock); | |
1688 | if (session->state != ISCSI_STATE_LOGGED_IN) { | |
1689 | /* | |
1690 | * We are probably in the middle of iscsi recovery so let | |
1691 | * that complete and handle the error. | |
1692 | */ | |
242f9dcb | 1693 | rc = BLK_EH_RESET_TIMER; |
f6d5180c MC |
1694 | goto done; |
1695 | } | |
1696 | ||
1697 | conn = session->leadconn; | |
1698 | if (!conn) { | |
1699 | /* In the middle of shuting down */ | |
242f9dcb | 1700 | rc = BLK_EH_RESET_TIMER; |
f6d5180c MC |
1701 | goto done; |
1702 | } | |
1703 | ||
1704 | if (!conn->recv_timeout && !conn->ping_timeout) | |
1705 | goto done; | |
1706 | /* | |
1707 | * if the ping timedout then we are in the middle of cleaning up | |
1708 | * and can let the iscsi eh handle it | |
1709 | */ | |
1710 | if (time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) + | |
1711 | (conn->ping_timeout * HZ), jiffies)) | |
242f9dcb | 1712 | rc = BLK_EH_RESET_TIMER; |
f6d5180c MC |
1713 | /* |
1714 | * if we are about to check the transport then give the command | |
1715 | * more time | |
1716 | */ | |
1717 | if (time_before_eq(conn->last_recv + (conn->recv_timeout * HZ), | |
1718 | jiffies)) | |
242f9dcb | 1719 | rc = BLK_EH_RESET_TIMER; |
f6d5180c | 1720 | /* if in the middle of checking the transport then give us more time */ |
9c19a7d0 | 1721 | if (conn->ping_task) |
242f9dcb | 1722 | rc = BLK_EH_RESET_TIMER; |
f6d5180c MC |
1723 | done: |
1724 | spin_unlock(&session->lock); | |
1b2c7af8 MC |
1725 | ISCSI_DBG_SESSION(session, "return %s\n", rc == BLK_EH_RESET_TIMER ? |
1726 | "timer reset" : "nh"); | |
f6d5180c MC |
1727 | return rc; |
1728 | } | |
1729 | ||
1730 | static void iscsi_check_transport_timeouts(unsigned long data) | |
1731 | { | |
1732 | struct iscsi_conn *conn = (struct iscsi_conn *)data; | |
1733 | struct iscsi_session *session = conn->session; | |
4cf10435 | 1734 | unsigned long recv_timeout, next_timeout = 0, last_recv; |
f6d5180c MC |
1735 | |
1736 | spin_lock(&session->lock); | |
1737 | if (session->state != ISCSI_STATE_LOGGED_IN) | |
1738 | goto done; | |
1739 | ||
4cf10435 MC |
1740 | recv_timeout = conn->recv_timeout; |
1741 | if (!recv_timeout) | |
f6d5180c MC |
1742 | goto done; |
1743 | ||
4cf10435 | 1744 | recv_timeout *= HZ; |
f6d5180c | 1745 | last_recv = conn->last_recv; |
9c19a7d0 | 1746 | if (conn->ping_task && |
4cf10435 | 1747 | time_before_eq(conn->last_ping + (conn->ping_timeout * HZ), |
f6d5180c | 1748 | jiffies)) { |
322d739d MC |
1749 | iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs " |
1750 | "expired, last rx %lu, last ping %lu, " | |
1751 | "now %lu\n", conn->ping_timeout, last_recv, | |
1752 | conn->last_ping, jiffies); | |
f6d5180c MC |
1753 | spin_unlock(&session->lock); |
1754 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1755 | return; | |
1756 | } | |
1757 | ||
4cf10435 | 1758 | if (time_before_eq(last_recv + recv_timeout, jiffies)) { |
c8611f97 | 1759 | /* send a ping to try to provoke some traffic */ |
1b2c7af8 | 1760 | ISCSI_DBG_CONN(conn, "Sending nopout as ping\n"); |
c8611f97 | 1761 | iscsi_send_nopout(conn, NULL); |
4cf10435 | 1762 | next_timeout = conn->last_ping + (conn->ping_timeout * HZ); |
ad294e9c | 1763 | } else |
4cf10435 | 1764 | next_timeout = last_recv + recv_timeout; |
f6d5180c | 1765 | |
1b2c7af8 | 1766 | ISCSI_DBG_CONN(conn, "Setting next tmo %lu\n", next_timeout); |
ad294e9c | 1767 | mod_timer(&conn->transport_timer, next_timeout); |
f6d5180c MC |
1768 | done: |
1769 | spin_unlock(&session->lock); | |
1770 | } | |
1771 | ||
9c19a7d0 | 1772 | static void iscsi_prep_abort_task_pdu(struct iscsi_task *task, |
843c0a8a MC |
1773 | struct iscsi_tm *hdr) |
1774 | { | |
1775 | memset(hdr, 0, sizeof(*hdr)); | |
1776 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
1777 | hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK; | |
1778 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
577577da MC |
1779 | memcpy(hdr->lun, task->lun, sizeof(hdr->lun)); |
1780 | hdr->rtt = task->hdr_itt; | |
1781 | hdr->refcmdsn = task->cmdsn; | |
843c0a8a MC |
1782 | } |
1783 | ||
7996a778 MC |
1784 | int iscsi_eh_abort(struct scsi_cmnd *sc) |
1785 | { | |
75613521 MC |
1786 | struct iscsi_cls_session *cls_session; |
1787 | struct iscsi_session *session; | |
f47f2cf5 | 1788 | struct iscsi_conn *conn; |
9c19a7d0 | 1789 | struct iscsi_task *task; |
843c0a8a MC |
1790 | struct iscsi_tm *hdr; |
1791 | int rc, age; | |
7996a778 | 1792 | |
75613521 MC |
1793 | cls_session = starget_to_session(scsi_target(sc->device)); |
1794 | session = cls_session->dd_data; | |
1795 | ||
6724add1 MC |
1796 | mutex_lock(&session->eh_mutex); |
1797 | spin_lock_bh(&session->lock); | |
f47f2cf5 MC |
1798 | /* |
1799 | * if session was ISCSI_STATE_IN_RECOVERY then we may not have | |
1800 | * got the command. | |
1801 | */ | |
1802 | if (!sc->SCp.ptr) { | |
1b2c7af8 MC |
1803 | ISCSI_DBG_SESSION(session, "sc never reached iscsi layer or " |
1804 | "it completed.\n"); | |
6724add1 MC |
1805 | spin_unlock_bh(&session->lock); |
1806 | mutex_unlock(&session->eh_mutex); | |
f47f2cf5 MC |
1807 | return SUCCESS; |
1808 | } | |
1809 | ||
7996a778 MC |
1810 | /* |
1811 | * If we are not logged in or we have started a new session | |
1812 | * then let the host reset code handle this | |
1813 | */ | |
843c0a8a MC |
1814 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN || |
1815 | sc->SCp.phase != session->age) { | |
1816 | spin_unlock_bh(&session->lock); | |
1817 | mutex_unlock(&session->eh_mutex); | |
1818 | return FAILED; | |
1819 | } | |
1820 | ||
1821 | conn = session->leadconn; | |
1822 | conn->eh_abort_cnt++; | |
1823 | age = session->age; | |
1824 | ||
9c19a7d0 | 1825 | task = (struct iscsi_task *)sc->SCp.ptr; |
1b2c7af8 MC |
1826 | ISCSI_DBG_SESSION(session, "aborting [sc %p itt 0x%x]\n", |
1827 | sc, task->itt); | |
7996a778 | 1828 | |
9c19a7d0 MC |
1829 | /* task completed before time out */ |
1830 | if (!task->sc) { | |
1b2c7af8 MC |
1831 | ISCSI_DBG_SESSION(session, "sc completed while abort in " |
1832 | "progress\n"); | |
77a23c21 | 1833 | goto success; |
7ea8b828 | 1834 | } |
7996a778 | 1835 | |
9c19a7d0 MC |
1836 | if (task->state == ISCSI_TASK_PENDING) { |
1837 | fail_command(conn, task, DID_ABORT << 16); | |
77a23c21 MC |
1838 | goto success; |
1839 | } | |
7996a778 | 1840 | |
843c0a8a MC |
1841 | /* only have one tmf outstanding at a time */ |
1842 | if (conn->tmf_state != TMF_INITIAL) | |
7996a778 | 1843 | goto failed; |
843c0a8a | 1844 | conn->tmf_state = TMF_QUEUED; |
7996a778 | 1845 | |
843c0a8a | 1846 | hdr = &conn->tmhdr; |
9c19a7d0 | 1847 | iscsi_prep_abort_task_pdu(task, hdr); |
843c0a8a | 1848 | |
9c19a7d0 | 1849 | if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout)) { |
843c0a8a MC |
1850 | rc = FAILED; |
1851 | goto failed; | |
1852 | } | |
1853 | ||
1854 | switch (conn->tmf_state) { | |
1855 | case TMF_SUCCESS: | |
77a23c21 | 1856 | spin_unlock_bh(&session->lock); |
913e5bf4 MC |
1857 | /* |
1858 | * stop tx side incase the target had sent a abort rsp but | |
1859 | * the initiator was still writing out data. | |
1860 | */ | |
6724add1 | 1861 | iscsi_suspend_tx(conn); |
77a23c21 | 1862 | /* |
913e5bf4 MC |
1863 | * we do not stop the recv side because targets have been |
1864 | * good and have never sent us a successful tmf response | |
1865 | * then sent more data for the cmd. | |
77a23c21 | 1866 | */ |
77a23c21 | 1867 | spin_lock(&session->lock); |
9c19a7d0 | 1868 | fail_command(conn, task, DID_ABORT << 16); |
843c0a8a | 1869 | conn->tmf_state = TMF_INITIAL; |
77a23c21 | 1870 | spin_unlock(&session->lock); |
6724add1 | 1871 | iscsi_start_tx(conn); |
77a23c21 | 1872 | goto success_unlocked; |
843c0a8a MC |
1873 | case TMF_TIMEDOUT: |
1874 | spin_unlock_bh(&session->lock); | |
1875 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1876 | goto failed_unlocked; | |
1877 | case TMF_NOT_FOUND: | |
1878 | if (!sc->SCp.ptr) { | |
1879 | conn->tmf_state = TMF_INITIAL; | |
9c19a7d0 | 1880 | /* task completed before tmf abort response */ |
1b2c7af8 MC |
1881 | ISCSI_DBG_SESSION(session, "sc completed while abort " |
1882 | "in progress\n"); | |
77a23c21 | 1883 | goto success; |
7ea8b828 MC |
1884 | } |
1885 | /* fall through */ | |
1886 | default: | |
843c0a8a MC |
1887 | conn->tmf_state = TMF_INITIAL; |
1888 | goto failed; | |
7996a778 MC |
1889 | } |
1890 | ||
77a23c21 | 1891 | success: |
7996a778 | 1892 | spin_unlock_bh(&session->lock); |
77a23c21 | 1893 | success_unlocked: |
1b2c7af8 MC |
1894 | ISCSI_DBG_SESSION(session, "abort success [sc %p itt 0x%x]\n", |
1895 | sc, task->itt); | |
6724add1 | 1896 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1897 | return SUCCESS; |
1898 | ||
1899 | failed: | |
1900 | spin_unlock_bh(&session->lock); | |
77a23c21 | 1901 | failed_unlocked: |
1b2c7af8 MC |
1902 | ISCSI_DBG_SESSION(session, "abort failed [sc %p itt 0x%x]\n", sc, |
1903 | task ? task->itt : 0); | |
6724add1 | 1904 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1905 | return FAILED; |
1906 | } | |
1907 | EXPORT_SYMBOL_GPL(iscsi_eh_abort); | |
1908 | ||
843c0a8a MC |
1909 | static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr) |
1910 | { | |
1911 | memset(hdr, 0, sizeof(*hdr)); | |
1912 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
1913 | hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK; | |
1914 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
1915 | int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun); | |
f6d5180c | 1916 | hdr->rtt = RESERVED_ITT; |
843c0a8a MC |
1917 | } |
1918 | ||
1919 | int iscsi_eh_device_reset(struct scsi_cmnd *sc) | |
1920 | { | |
75613521 MC |
1921 | struct iscsi_cls_session *cls_session; |
1922 | struct iscsi_session *session; | |
843c0a8a MC |
1923 | struct iscsi_conn *conn; |
1924 | struct iscsi_tm *hdr; | |
1925 | int rc = FAILED; | |
1926 | ||
75613521 MC |
1927 | cls_session = starget_to_session(scsi_target(sc->device)); |
1928 | session = cls_session->dd_data; | |
1929 | ||
1b2c7af8 MC |
1930 | ISCSI_DBG_SESSION(session, "LU Reset [sc %p lun %u]\n", |
1931 | sc, sc->device->lun); | |
843c0a8a MC |
1932 | |
1933 | mutex_lock(&session->eh_mutex); | |
1934 | spin_lock_bh(&session->lock); | |
1935 | /* | |
1936 | * Just check if we are not logged in. We cannot check for | |
1937 | * the phase because the reset could come from a ioctl. | |
1938 | */ | |
1939 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN) | |
1940 | goto unlock; | |
1941 | conn = session->leadconn; | |
1942 | ||
1943 | /* only have one tmf outstanding at a time */ | |
1944 | if (conn->tmf_state != TMF_INITIAL) | |
1945 | goto unlock; | |
1946 | conn->tmf_state = TMF_QUEUED; | |
1947 | ||
1948 | hdr = &conn->tmhdr; | |
1949 | iscsi_prep_lun_reset_pdu(sc, hdr); | |
1950 | ||
9c19a7d0 | 1951 | if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age, |
f6d5180c | 1952 | session->lu_reset_timeout)) { |
843c0a8a MC |
1953 | rc = FAILED; |
1954 | goto unlock; | |
1955 | } | |
1956 | ||
1957 | switch (conn->tmf_state) { | |
1958 | case TMF_SUCCESS: | |
1959 | break; | |
1960 | case TMF_TIMEDOUT: | |
1961 | spin_unlock_bh(&session->lock); | |
1962 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1963 | goto done; | |
1964 | default: | |
1965 | conn->tmf_state = TMF_INITIAL; | |
1966 | goto unlock; | |
1967 | } | |
1968 | ||
1969 | rc = SUCCESS; | |
1970 | spin_unlock_bh(&session->lock); | |
1971 | ||
1972 | iscsi_suspend_tx(conn); | |
913e5bf4 | 1973 | |
a3439148 | 1974 | spin_lock_bh(&session->lock); |
6eabafbe | 1975 | fail_all_commands(conn, sc->device->lun, DID_ERROR); |
843c0a8a | 1976 | conn->tmf_state = TMF_INITIAL; |
a3439148 | 1977 | spin_unlock_bh(&session->lock); |
843c0a8a MC |
1978 | |
1979 | iscsi_start_tx(conn); | |
1980 | goto done; | |
1981 | ||
1982 | unlock: | |
1983 | spin_unlock_bh(&session->lock); | |
1984 | done: | |
1b2c7af8 MC |
1985 | ISCSI_DBG_SESSION(session, "dev reset result = %s\n", |
1986 | rc == SUCCESS ? "SUCCESS" : "FAILED"); | |
843c0a8a MC |
1987 | mutex_unlock(&session->eh_mutex); |
1988 | return rc; | |
1989 | } | |
1990 | EXPORT_SYMBOL_GPL(iscsi_eh_device_reset); | |
1991 | ||
6320377f OK |
1992 | /* |
1993 | * Pre-allocate a pool of @max items of @item_size. By default, the pool | |
1994 | * should be accessed via kfifo_{get,put} on q->queue. | |
1995 | * Optionally, the caller can obtain the array of object pointers | |
1996 | * by passing in a non-NULL @items pointer | |
1997 | */ | |
7996a778 | 1998 | int |
6320377f | 1999 | iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size) |
7996a778 | 2000 | { |
6320377f | 2001 | int i, num_arrays = 1; |
7996a778 | 2002 | |
6320377f | 2003 | memset(q, 0, sizeof(*q)); |
7996a778 MC |
2004 | |
2005 | q->max = max; | |
6320377f OK |
2006 | |
2007 | /* If the user passed an items pointer, he wants a copy of | |
2008 | * the array. */ | |
2009 | if (items) | |
2010 | num_arrays++; | |
2011 | q->pool = kzalloc(num_arrays * max * sizeof(void*), GFP_KERNEL); | |
2012 | if (q->pool == NULL) | |
f474a37b | 2013 | return -ENOMEM; |
7996a778 MC |
2014 | |
2015 | q->queue = kfifo_init((void*)q->pool, max * sizeof(void*), | |
2016 | GFP_KERNEL, NULL); | |
fd6e1c14 JD |
2017 | if (IS_ERR(q->queue)) { |
2018 | q->queue = NULL; | |
6320377f | 2019 | goto enomem; |
fd6e1c14 | 2020 | } |
7996a778 MC |
2021 | |
2022 | for (i = 0; i < max; i++) { | |
6320377f | 2023 | q->pool[i] = kzalloc(item_size, GFP_KERNEL); |
7996a778 | 2024 | if (q->pool[i] == NULL) { |
6320377f OK |
2025 | q->max = i; |
2026 | goto enomem; | |
7996a778 | 2027 | } |
7996a778 MC |
2028 | __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*)); |
2029 | } | |
6320377f OK |
2030 | |
2031 | if (items) { | |
2032 | *items = q->pool + max; | |
2033 | memcpy(*items, q->pool, max * sizeof(void *)); | |
2034 | } | |
2035 | ||
7996a778 | 2036 | return 0; |
6320377f OK |
2037 | |
2038 | enomem: | |
2039 | iscsi_pool_free(q); | |
2040 | return -ENOMEM; | |
7996a778 MC |
2041 | } |
2042 | EXPORT_SYMBOL_GPL(iscsi_pool_init); | |
2043 | ||
6320377f | 2044 | void iscsi_pool_free(struct iscsi_pool *q) |
7996a778 MC |
2045 | { |
2046 | int i; | |
2047 | ||
2048 | for (i = 0; i < q->max; i++) | |
6320377f | 2049 | kfree(q->pool[i]); |
f474a37b | 2050 | kfree(q->pool); |
2f5899a3 | 2051 | kfree(q->queue); |
7996a778 MC |
2052 | } |
2053 | EXPORT_SYMBOL_GPL(iscsi_pool_free); | |
2054 | ||
a4804cd6 MC |
2055 | /** |
2056 | * iscsi_host_add - add host to system | |
2057 | * @shost: scsi host | |
2058 | * @pdev: parent device | |
2059 | * | |
2060 | * This should be called by partial offload and software iscsi drivers | |
2061 | * to add a host to the system. | |
2062 | */ | |
2063 | int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev) | |
2064 | { | |
8e9a20ce MC |
2065 | if (!shost->can_queue) |
2066 | shost->can_queue = ISCSI_DEF_XMIT_CMDS_MAX; | |
2067 | ||
4d108350 MC |
2068 | if (!shost->cmd_per_lun) |
2069 | shost->cmd_per_lun = ISCSI_DEF_CMD_PER_LUN; | |
2070 | ||
308cec14 MC |
2071 | if (!shost->transportt->eh_timed_out) |
2072 | shost->transportt->eh_timed_out = iscsi_eh_cmd_timed_out; | |
a4804cd6 MC |
2073 | return scsi_add_host(shost, pdev); |
2074 | } | |
2075 | EXPORT_SYMBOL_GPL(iscsi_host_add); | |
2076 | ||
2077 | /** | |
2078 | * iscsi_host_alloc - allocate a host and driver data | |
2079 | * @sht: scsi host template | |
2080 | * @dd_data_size: driver host data size | |
32ae763e | 2081 | * @xmit_can_sleep: bool indicating if LLD will queue IO from a work queue |
a4804cd6 MC |
2082 | * |
2083 | * This should be called by partial offload and software iscsi drivers. | |
2084 | * To access the driver specific memory use the iscsi_host_priv() macro. | |
2085 | */ | |
2086 | struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht, | |
4d108350 | 2087 | int dd_data_size, bool xmit_can_sleep) |
75613521 | 2088 | { |
a4804cd6 | 2089 | struct Scsi_Host *shost; |
e5bd7b54 | 2090 | struct iscsi_host *ihost; |
a4804cd6 MC |
2091 | |
2092 | shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size); | |
2093 | if (!shost) | |
2094 | return NULL; | |
e5bd7b54 | 2095 | ihost = shost_priv(shost); |
32ae763e MC |
2096 | |
2097 | if (xmit_can_sleep) { | |
2098 | snprintf(ihost->workq_name, sizeof(ihost->workq_name), | |
2099 | "iscsi_q_%d", shost->host_no); | |
2100 | ihost->workq = create_singlethread_workqueue(ihost->workq_name); | |
2101 | if (!ihost->workq) | |
2102 | goto free_host; | |
2103 | } | |
2104 | ||
e5bd7b54 MC |
2105 | spin_lock_init(&ihost->lock); |
2106 | ihost->state = ISCSI_HOST_SETUP; | |
2107 | ihost->num_sessions = 0; | |
2108 | init_waitqueue_head(&ihost->session_removal_wq); | |
a4804cd6 | 2109 | return shost; |
32ae763e MC |
2110 | |
2111 | free_host: | |
2112 | scsi_host_put(shost); | |
2113 | return NULL; | |
a4804cd6 MC |
2114 | } |
2115 | EXPORT_SYMBOL_GPL(iscsi_host_alloc); | |
2116 | ||
e5bd7b54 MC |
2117 | static void iscsi_notify_host_removed(struct iscsi_cls_session *cls_session) |
2118 | { | |
40a06e75 | 2119 | iscsi_session_failure(cls_session->dd_data, ISCSI_ERR_INVALID_HOST); |
e5bd7b54 MC |
2120 | } |
2121 | ||
a4804cd6 MC |
2122 | /** |
2123 | * iscsi_host_remove - remove host and sessions | |
2124 | * @shost: scsi host | |
2125 | * | |
e5bd7b54 MC |
2126 | * If there are any sessions left, this will initiate the removal and wait |
2127 | * for the completion. | |
a4804cd6 MC |
2128 | */ |
2129 | void iscsi_host_remove(struct Scsi_Host *shost) | |
2130 | { | |
e5bd7b54 MC |
2131 | struct iscsi_host *ihost = shost_priv(shost); |
2132 | unsigned long flags; | |
2133 | ||
2134 | spin_lock_irqsave(&ihost->lock, flags); | |
2135 | ihost->state = ISCSI_HOST_REMOVED; | |
2136 | spin_unlock_irqrestore(&ihost->lock, flags); | |
2137 | ||
2138 | iscsi_host_for_each_session(shost, iscsi_notify_host_removed); | |
2139 | wait_event_interruptible(ihost->session_removal_wq, | |
2140 | ihost->num_sessions == 0); | |
2141 | if (signal_pending(current)) | |
2142 | flush_signals(current); | |
2143 | ||
a4804cd6 | 2144 | scsi_remove_host(shost); |
32ae763e MC |
2145 | if (ihost->workq) |
2146 | destroy_workqueue(ihost->workq); | |
75613521 | 2147 | } |
a4804cd6 | 2148 | EXPORT_SYMBOL_GPL(iscsi_host_remove); |
7996a778 | 2149 | |
a4804cd6 | 2150 | void iscsi_host_free(struct Scsi_Host *shost) |
75613521 MC |
2151 | { |
2152 | struct iscsi_host *ihost = shost_priv(shost); | |
7996a778 | 2153 | |
75613521 MC |
2154 | kfree(ihost->netdev); |
2155 | kfree(ihost->hwaddress); | |
2156 | kfree(ihost->initiatorname); | |
a4804cd6 | 2157 | scsi_host_put(shost); |
75613521 | 2158 | } |
a4804cd6 | 2159 | EXPORT_SYMBOL_GPL(iscsi_host_free); |
7996a778 | 2160 | |
e5bd7b54 MC |
2161 | static void iscsi_host_dec_session_cnt(struct Scsi_Host *shost) |
2162 | { | |
2163 | struct iscsi_host *ihost = shost_priv(shost); | |
2164 | unsigned long flags; | |
2165 | ||
2166 | shost = scsi_host_get(shost); | |
2167 | if (!shost) { | |
2168 | printk(KERN_ERR "Invalid state. Cannot notify host removal " | |
2169 | "of session teardown event because host already " | |
2170 | "removed.\n"); | |
2171 | return; | |
2172 | } | |
2173 | ||
2174 | spin_lock_irqsave(&ihost->lock, flags); | |
2175 | ihost->num_sessions--; | |
2176 | if (ihost->num_sessions == 0) | |
2177 | wake_up(&ihost->session_removal_wq); | |
2178 | spin_unlock_irqrestore(&ihost->lock, flags); | |
2179 | scsi_host_put(shost); | |
2180 | } | |
2181 | ||
7996a778 MC |
2182 | /** |
2183 | * iscsi_session_setup - create iscsi cls session and host and session | |
7996a778 | 2184 | * @iscsit: iscsi transport template |
75613521 MC |
2185 | * @shost: scsi host |
2186 | * @cmds_max: session can queue | |
9c19a7d0 | 2187 | * @cmd_task_size: LLD task private data size |
7996a778 | 2188 | * @initial_cmdsn: initial CmdSN |
7996a778 MC |
2189 | * |
2190 | * This can be used by software iscsi_transports that allocate | |
2191 | * a session per scsi host. | |
3cf7b233 MC |
2192 | * |
2193 | * Callers should set cmds_max to the largest total numer (mgmt + scsi) of | |
2194 | * tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks | |
2195 | * for nop handling and login/logout requests. | |
75613521 | 2196 | */ |
7996a778 | 2197 | struct iscsi_cls_session * |
75613521 | 2198 | iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost, |
3cf7b233 | 2199 | uint16_t cmds_max, int cmd_task_size, |
7970634b | 2200 | uint32_t initial_cmdsn, unsigned int id) |
7996a778 | 2201 | { |
e5bd7b54 | 2202 | struct iscsi_host *ihost = shost_priv(shost); |
7996a778 MC |
2203 | struct iscsi_session *session; |
2204 | struct iscsi_cls_session *cls_session; | |
3cf7b233 | 2205 | int cmd_i, scsi_cmds, total_cmds = cmds_max; |
e5bd7b54 MC |
2206 | unsigned long flags; |
2207 | ||
2208 | spin_lock_irqsave(&ihost->lock, flags); | |
2209 | if (ihost->state == ISCSI_HOST_REMOVED) { | |
2210 | spin_unlock_irqrestore(&ihost->lock, flags); | |
2211 | return NULL; | |
2212 | } | |
2213 | ihost->num_sessions++; | |
2214 | spin_unlock_irqrestore(&ihost->lock, flags); | |
8e9a20ce MC |
2215 | |
2216 | if (!total_cmds) | |
2217 | total_cmds = ISCSI_DEF_XMIT_CMDS_MAX; | |
3e5c28ad | 2218 | /* |
3cf7b233 MC |
2219 | * The iscsi layer needs some tasks for nop handling and tmfs, |
2220 | * so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX | |
2221 | * + 1 command for scsi IO. | |
3e5c28ad | 2222 | */ |
3cf7b233 MC |
2223 | if (total_cmds < ISCSI_TOTAL_CMDS_MIN) { |
2224 | printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " | |
2225 | "must be a power of two that is at least %d.\n", | |
2226 | total_cmds, ISCSI_TOTAL_CMDS_MIN); | |
e5bd7b54 | 2227 | goto dec_session_count; |
3cf7b233 MC |
2228 | } |
2229 | ||
2230 | if (total_cmds > ISCSI_TOTAL_CMDS_MAX) { | |
2231 | printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " | |
2232 | "must be a power of 2 less than or equal to %d.\n", | |
2233 | cmds_max, ISCSI_TOTAL_CMDS_MAX); | |
2234 | total_cmds = ISCSI_TOTAL_CMDS_MAX; | |
2235 | } | |
2236 | ||
2237 | if (!is_power_of_2(total_cmds)) { | |
2238 | printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " | |
2239 | "must be a power of 2.\n", total_cmds); | |
2240 | total_cmds = rounddown_pow_of_two(total_cmds); | |
2241 | if (total_cmds < ISCSI_TOTAL_CMDS_MIN) | |
2242 | return NULL; | |
2243 | printk(KERN_INFO "iscsi: Rounding can_queue to %d.\n", | |
2244 | total_cmds); | |
1548271e | 2245 | } |
3cf7b233 | 2246 | scsi_cmds = total_cmds - ISCSI_MGMT_CMDS_MAX; |
1548271e | 2247 | |
5d91e209 MC |
2248 | cls_session = iscsi_alloc_session(shost, iscsit, |
2249 | sizeof(struct iscsi_session)); | |
75613521 | 2250 | if (!cls_session) |
e5bd7b54 | 2251 | goto dec_session_count; |
75613521 MC |
2252 | session = cls_session->dd_data; |
2253 | session->cls_session = cls_session; | |
7996a778 MC |
2254 | session->host = shost; |
2255 | session->state = ISCSI_STATE_FREE; | |
f6d5180c | 2256 | session->fast_abort = 1; |
4cd49ea1 MC |
2257 | session->lu_reset_timeout = 15; |
2258 | session->abort_timeout = 10; | |
3cf7b233 MC |
2259 | session->scsi_cmds_max = scsi_cmds; |
2260 | session->cmds_max = total_cmds; | |
e0726407 | 2261 | session->queued_cmdsn = session->cmdsn = initial_cmdsn; |
7996a778 MC |
2262 | session->exp_cmdsn = initial_cmdsn + 1; |
2263 | session->max_cmdsn = initial_cmdsn + 1; | |
2264 | session->max_r2t = 1; | |
2265 | session->tt = iscsit; | |
6724add1 | 2266 | mutex_init(&session->eh_mutex); |
75613521 | 2267 | spin_lock_init(&session->lock); |
7996a778 MC |
2268 | |
2269 | /* initialize SCSI PDU commands pool */ | |
2270 | if (iscsi_pool_init(&session->cmdpool, session->cmds_max, | |
2271 | (void***)&session->cmds, | |
9c19a7d0 | 2272 | cmd_task_size + sizeof(struct iscsi_task))) |
7996a778 MC |
2273 | goto cmdpool_alloc_fail; |
2274 | ||
2275 | /* pre-format cmds pool with ITT */ | |
2276 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
9c19a7d0 | 2277 | struct iscsi_task *task = session->cmds[cmd_i]; |
7996a778 | 2278 | |
9c19a7d0 MC |
2279 | if (cmd_task_size) |
2280 | task->dd_data = &task[1]; | |
2281 | task->itt = cmd_i; | |
2282 | INIT_LIST_HEAD(&task->running); | |
7996a778 MC |
2283 | } |
2284 | ||
f53a88da | 2285 | if (!try_module_get(iscsit->owner)) |
75613521 | 2286 | goto module_get_fail; |
7996a778 | 2287 | |
7970634b | 2288 | if (iscsi_add_session(cls_session, id)) |
75613521 | 2289 | goto cls_session_fail; |
e5bd7b54 | 2290 | |
7996a778 MC |
2291 | return cls_session; |
2292 | ||
2293 | cls_session_fail: | |
75613521 MC |
2294 | module_put(iscsit->owner); |
2295 | module_get_fail: | |
6320377f | 2296 | iscsi_pool_free(&session->cmdpool); |
7996a778 | 2297 | cmdpool_alloc_fail: |
75613521 | 2298 | iscsi_free_session(cls_session); |
e5bd7b54 MC |
2299 | dec_session_count: |
2300 | iscsi_host_dec_session_cnt(shost); | |
7996a778 MC |
2301 | return NULL; |
2302 | } | |
2303 | EXPORT_SYMBOL_GPL(iscsi_session_setup); | |
2304 | ||
2305 | /** | |
2306 | * iscsi_session_teardown - destroy session, host, and cls_session | |
75613521 | 2307 | * @cls_session: iscsi session |
7996a778 | 2308 | * |
75613521 MC |
2309 | * The driver must have called iscsi_remove_session before |
2310 | * calling this. | |
2311 | */ | |
7996a778 MC |
2312 | void iscsi_session_teardown(struct iscsi_cls_session *cls_session) |
2313 | { | |
75613521 | 2314 | struct iscsi_session *session = cls_session->dd_data; |
63f75cc8 | 2315 | struct module *owner = cls_session->transport->owner; |
e5bd7b54 | 2316 | struct Scsi_Host *shost = session->host; |
7996a778 | 2317 | |
6320377f | 2318 | iscsi_pool_free(&session->cmdpool); |
7996a778 | 2319 | |
b2c64167 MC |
2320 | kfree(session->password); |
2321 | kfree(session->password_in); | |
2322 | kfree(session->username); | |
2323 | kfree(session->username_in); | |
f3ff0c36 | 2324 | kfree(session->targetname); |
88dfd340 MC |
2325 | kfree(session->initiatorname); |
2326 | kfree(session->ifacename); | |
f3ff0c36 | 2327 | |
75613521 | 2328 | iscsi_destroy_session(cls_session); |
e5bd7b54 | 2329 | iscsi_host_dec_session_cnt(shost); |
63f75cc8 | 2330 | module_put(owner); |
7996a778 MC |
2331 | } |
2332 | EXPORT_SYMBOL_GPL(iscsi_session_teardown); | |
2333 | ||
2334 | /** | |
2335 | * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn | |
2336 | * @cls_session: iscsi_cls_session | |
5d91e209 | 2337 | * @dd_size: private driver data size |
7996a778 | 2338 | * @conn_idx: cid |
5d91e209 | 2339 | */ |
7996a778 | 2340 | struct iscsi_cls_conn * |
5d91e209 MC |
2341 | iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size, |
2342 | uint32_t conn_idx) | |
7996a778 | 2343 | { |
75613521 | 2344 | struct iscsi_session *session = cls_session->dd_data; |
7996a778 MC |
2345 | struct iscsi_conn *conn; |
2346 | struct iscsi_cls_conn *cls_conn; | |
d36ab6f3 | 2347 | char *data; |
7996a778 | 2348 | |
5d91e209 MC |
2349 | cls_conn = iscsi_create_conn(cls_session, sizeof(*conn) + dd_size, |
2350 | conn_idx); | |
7996a778 MC |
2351 | if (!cls_conn) |
2352 | return NULL; | |
2353 | conn = cls_conn->dd_data; | |
5d91e209 | 2354 | memset(conn, 0, sizeof(*conn) + dd_size); |
7996a778 | 2355 | |
5d91e209 | 2356 | conn->dd_data = cls_conn->dd_data + sizeof(*conn); |
7996a778 MC |
2357 | conn->session = session; |
2358 | conn->cls_conn = cls_conn; | |
2359 | conn->c_stage = ISCSI_CONN_INITIAL_STAGE; | |
2360 | conn->id = conn_idx; | |
2361 | conn->exp_statsn = 0; | |
843c0a8a | 2362 | conn->tmf_state = TMF_INITIAL; |
f6d5180c MC |
2363 | |
2364 | init_timer(&conn->transport_timer); | |
2365 | conn->transport_timer.data = (unsigned long)conn; | |
2366 | conn->transport_timer.function = iscsi_check_transport_timeouts; | |
2367 | ||
7996a778 MC |
2368 | INIT_LIST_HEAD(&conn->run_list); |
2369 | INIT_LIST_HEAD(&conn->mgmt_run_list); | |
843c0a8a | 2370 | INIT_LIST_HEAD(&conn->mgmtqueue); |
b6c395ed | 2371 | INIT_LIST_HEAD(&conn->xmitqueue); |
843c0a8a | 2372 | INIT_LIST_HEAD(&conn->requeue); |
c4028958 | 2373 | INIT_WORK(&conn->xmitwork, iscsi_xmitworker); |
7996a778 | 2374 | |
9c19a7d0 | 2375 | /* allocate login_task used for the login/text sequences */ |
7996a778 | 2376 | spin_lock_bh(&session->lock); |
3e5c28ad | 2377 | if (!__kfifo_get(session->cmdpool.queue, |
9c19a7d0 | 2378 | (void*)&conn->login_task, |
7996a778 MC |
2379 | sizeof(void*))) { |
2380 | spin_unlock_bh(&session->lock); | |
9c19a7d0 | 2381 | goto login_task_alloc_fail; |
7996a778 MC |
2382 | } |
2383 | spin_unlock_bh(&session->lock); | |
2384 | ||
cfeb2cf9 MC |
2385 | data = (char *) __get_free_pages(GFP_KERNEL, |
2386 | get_order(ISCSI_DEF_MAX_RECV_SEG_LEN)); | |
d36ab6f3 | 2387 | if (!data) |
9c19a7d0 MC |
2388 | goto login_task_data_alloc_fail; |
2389 | conn->login_task->data = conn->data = data; | |
d36ab6f3 | 2390 | |
843c0a8a | 2391 | init_timer(&conn->tmf_timer); |
7996a778 MC |
2392 | init_waitqueue_head(&conn->ehwait); |
2393 | ||
2394 | return cls_conn; | |
2395 | ||
9c19a7d0 MC |
2396 | login_task_data_alloc_fail: |
2397 | __kfifo_put(session->cmdpool.queue, (void*)&conn->login_task, | |
d36ab6f3 | 2398 | sizeof(void*)); |
9c19a7d0 | 2399 | login_task_alloc_fail: |
7996a778 MC |
2400 | iscsi_destroy_conn(cls_conn); |
2401 | return NULL; | |
2402 | } | |
2403 | EXPORT_SYMBOL_GPL(iscsi_conn_setup); | |
2404 | ||
2405 | /** | |
2406 | * iscsi_conn_teardown - teardown iscsi connection | |
2407 | * cls_conn: iscsi class connection | |
2408 | * | |
2409 | * TODO: we may need to make this into a two step process | |
2410 | * like scsi-mls remove + put host | |
2411 | */ | |
2412 | void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn) | |
2413 | { | |
2414 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2415 | struct iscsi_session *session = conn->session; | |
2416 | unsigned long flags; | |
2417 | ||
f6d5180c MC |
2418 | del_timer_sync(&conn->transport_timer); |
2419 | ||
7996a778 MC |
2420 | spin_lock_bh(&session->lock); |
2421 | conn->c_stage = ISCSI_CONN_CLEANUP_WAIT; | |
2422 | if (session->leadconn == conn) { | |
2423 | /* | |
2424 | * leading connection? then give up on recovery. | |
2425 | */ | |
2426 | session->state = ISCSI_STATE_TERMINATE; | |
2427 | wake_up(&conn->ehwait); | |
2428 | } | |
2429 | spin_unlock_bh(&session->lock); | |
2430 | ||
7996a778 MC |
2431 | /* |
2432 | * Block until all in-progress commands for this connection | |
2433 | * time out or fail. | |
2434 | */ | |
2435 | for (;;) { | |
2436 | spin_lock_irqsave(session->host->host_lock, flags); | |
2437 | if (!session->host->host_busy) { /* OK for ERL == 0 */ | |
2438 | spin_unlock_irqrestore(session->host->host_lock, flags); | |
2439 | break; | |
2440 | } | |
2441 | spin_unlock_irqrestore(session->host->host_lock, flags); | |
2442 | msleep_interruptible(500); | |
322d739d MC |
2443 | iscsi_conn_printk(KERN_INFO, conn, "iscsi conn_destroy(): " |
2444 | "host_busy %d host_failed %d\n", | |
2445 | session->host->host_busy, | |
2446 | session->host->host_failed); | |
7996a778 MC |
2447 | /* |
2448 | * force eh_abort() to unblock | |
2449 | */ | |
2450 | wake_up(&conn->ehwait); | |
2451 | } | |
2452 | ||
779ea120 | 2453 | /* flush queued up work because we free the connection below */ |
843c0a8a | 2454 | iscsi_suspend_tx(conn); |
779ea120 | 2455 | |
7996a778 | 2456 | spin_lock_bh(&session->lock); |
cfeb2cf9 MC |
2457 | free_pages((unsigned long) conn->data, |
2458 | get_order(ISCSI_DEF_MAX_RECV_SEG_LEN)); | |
f3ff0c36 | 2459 | kfree(conn->persistent_address); |
9c19a7d0 | 2460 | __kfifo_put(session->cmdpool.queue, (void*)&conn->login_task, |
7996a778 | 2461 | sizeof(void*)); |
e0726407 | 2462 | if (session->leadconn == conn) |
7996a778 | 2463 | session->leadconn = NULL; |
7996a778 MC |
2464 | spin_unlock_bh(&session->lock); |
2465 | ||
7996a778 MC |
2466 | iscsi_destroy_conn(cls_conn); |
2467 | } | |
2468 | EXPORT_SYMBOL_GPL(iscsi_conn_teardown); | |
2469 | ||
2470 | int iscsi_conn_start(struct iscsi_cls_conn *cls_conn) | |
2471 | { | |
2472 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2473 | struct iscsi_session *session = conn->session; | |
2474 | ||
ffd0436e | 2475 | if (!session) { |
322d739d MC |
2476 | iscsi_conn_printk(KERN_ERR, conn, |
2477 | "can't start unbound connection\n"); | |
7996a778 MC |
2478 | return -EPERM; |
2479 | } | |
2480 | ||
db98ccde MC |
2481 | if ((session->imm_data_en || !session->initial_r2t_en) && |
2482 | session->first_burst > session->max_burst) { | |
322d739d MC |
2483 | iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: " |
2484 | "first_burst %d max_burst %d\n", | |
2485 | session->first_burst, session->max_burst); | |
ffd0436e MC |
2486 | return -EINVAL; |
2487 | } | |
2488 | ||
f6d5180c | 2489 | if (conn->ping_timeout && !conn->recv_timeout) { |
322d739d MC |
2490 | iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of " |
2491 | "zero. Using 5 seconds\n."); | |
f6d5180c MC |
2492 | conn->recv_timeout = 5; |
2493 | } | |
2494 | ||
2495 | if (conn->recv_timeout && !conn->ping_timeout) { | |
322d739d MC |
2496 | iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of " |
2497 | "zero. Using 5 seconds.\n"); | |
f6d5180c MC |
2498 | conn->ping_timeout = 5; |
2499 | } | |
2500 | ||
7996a778 MC |
2501 | spin_lock_bh(&session->lock); |
2502 | conn->c_stage = ISCSI_CONN_STARTED; | |
2503 | session->state = ISCSI_STATE_LOGGED_IN; | |
e0726407 | 2504 | session->queued_cmdsn = session->cmdsn; |
7996a778 | 2505 | |
f6d5180c MC |
2506 | conn->last_recv = jiffies; |
2507 | conn->last_ping = jiffies; | |
2508 | if (conn->recv_timeout && conn->ping_timeout) | |
2509 | mod_timer(&conn->transport_timer, | |
2510 | jiffies + (conn->recv_timeout * HZ)); | |
2511 | ||
7996a778 MC |
2512 | switch(conn->stop_stage) { |
2513 | case STOP_CONN_RECOVER: | |
2514 | /* | |
2515 | * unblock eh_abort() if it is blocked. re-try all | |
2516 | * commands after successful recovery | |
2517 | */ | |
7996a778 | 2518 | conn->stop_stage = 0; |
843c0a8a | 2519 | conn->tmf_state = TMF_INITIAL; |
7996a778 | 2520 | session->age++; |
8b1d0343 MC |
2521 | if (session->age == 16) |
2522 | session->age = 0; | |
6eabafbe | 2523 | break; |
7996a778 | 2524 | case STOP_CONN_TERM: |
7996a778 | 2525 | conn->stop_stage = 0; |
7996a778 MC |
2526 | break; |
2527 | default: | |
2528 | break; | |
2529 | } | |
2530 | spin_unlock_bh(&session->lock); | |
2531 | ||
75613521 | 2532 | iscsi_unblock_session(session->cls_session); |
6eabafbe | 2533 | wake_up(&conn->ehwait); |
7996a778 MC |
2534 | return 0; |
2535 | } | |
2536 | EXPORT_SYMBOL_GPL(iscsi_conn_start); | |
2537 | ||
2538 | static void | |
2539 | flush_control_queues(struct iscsi_session *session, struct iscsi_conn *conn) | |
2540 | { | |
9c19a7d0 | 2541 | struct iscsi_task *task, *tmp; |
7996a778 MC |
2542 | |
2543 | /* handle pending */ | |
9c19a7d0 | 2544 | list_for_each_entry_safe(task, tmp, &conn->mgmtqueue, running) { |
1b2c7af8 MC |
2545 | ISCSI_DBG_SESSION(session, "flushing pending mgmt task " |
2546 | "itt 0x%x\n", task->itt); | |
9c19a7d0 MC |
2547 | /* release ref from prep task */ |
2548 | __iscsi_put_task(task); | |
7996a778 MC |
2549 | } |
2550 | ||
2551 | /* handle running */ | |
9c19a7d0 | 2552 | list_for_each_entry_safe(task, tmp, &conn->mgmt_run_list, running) { |
1b2c7af8 MC |
2553 | ISCSI_DBG_SESSION(session, "flushing running mgmt task " |
2554 | "itt 0x%x\n", task->itt); | |
9c19a7d0 MC |
2555 | /* release ref from prep task */ |
2556 | __iscsi_put_task(task); | |
7996a778 MC |
2557 | } |
2558 | ||
9c19a7d0 | 2559 | conn->task = NULL; |
7996a778 MC |
2560 | } |
2561 | ||
656cffc9 MC |
2562 | static void iscsi_start_session_recovery(struct iscsi_session *session, |
2563 | struct iscsi_conn *conn, int flag) | |
7996a778 | 2564 | { |
ed2abc7f MC |
2565 | int old_stop_stage; |
2566 | ||
f6d5180c MC |
2567 | del_timer_sync(&conn->transport_timer); |
2568 | ||
6724add1 | 2569 | mutex_lock(&session->eh_mutex); |
7996a778 | 2570 | spin_lock_bh(&session->lock); |
ed2abc7f | 2571 | if (conn->stop_stage == STOP_CONN_TERM) { |
7996a778 | 2572 | spin_unlock_bh(&session->lock); |
6724add1 MC |
2573 | mutex_unlock(&session->eh_mutex); |
2574 | return; | |
2575 | } | |
2576 | ||
ed2abc7f MC |
2577 | /* |
2578 | * When this is called for the in_login state, we only want to clean | |
9c19a7d0 | 2579 | * up the login task and connection. We do not need to block and set |
67a61114 | 2580 | * the recovery state again |
ed2abc7f | 2581 | */ |
67a61114 MC |
2582 | if (flag == STOP_CONN_TERM) |
2583 | session->state = ISCSI_STATE_TERMINATE; | |
2584 | else if (conn->stop_stage != STOP_CONN_RECOVER) | |
2585 | session->state = ISCSI_STATE_IN_RECOVERY; | |
ed2abc7f MC |
2586 | |
2587 | old_stop_stage = conn->stop_stage; | |
7996a778 | 2588 | conn->stop_stage = flag; |
67a61114 | 2589 | conn->c_stage = ISCSI_CONN_STOPPED; |
7996a778 | 2590 | spin_unlock_bh(&session->lock); |
6724add1 MC |
2591 | |
2592 | iscsi_suspend_tx(conn); | |
7996a778 MC |
2593 | /* |
2594 | * for connection level recovery we should not calculate | |
2595 | * header digest. conn->hdr_size used for optimization | |
2596 | * in hdr_extract() and will be re-negotiated at | |
2597 | * set_param() time. | |
2598 | */ | |
2599 | if (flag == STOP_CONN_RECOVER) { | |
2600 | conn->hdrdgst_en = 0; | |
2601 | conn->datadgst_en = 0; | |
656cffc9 | 2602 | if (session->state == ISCSI_STATE_IN_RECOVERY && |
67a61114 | 2603 | old_stop_stage != STOP_CONN_RECOVER) { |
1b2c7af8 | 2604 | ISCSI_DBG_SESSION(session, "blocking session\n"); |
75613521 | 2605 | iscsi_block_session(session->cls_session); |
67a61114 | 2606 | } |
7996a778 | 2607 | } |
656cffc9 | 2608 | |
656cffc9 MC |
2609 | /* |
2610 | * flush queues. | |
2611 | */ | |
2612 | spin_lock_bh(&session->lock); | |
87cd9eab | 2613 | if (flag == STOP_CONN_RECOVER) |
56d7fcfa MC |
2614 | fail_all_commands(conn, -1, DID_TRANSPORT_DISRUPTED); |
2615 | else | |
2616 | fail_all_commands(conn, -1, DID_ERROR); | |
656cffc9 MC |
2617 | flush_control_queues(session, conn); |
2618 | spin_unlock_bh(&session->lock); | |
6724add1 | 2619 | mutex_unlock(&session->eh_mutex); |
7996a778 | 2620 | } |
7996a778 MC |
2621 | |
2622 | void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) | |
2623 | { | |
2624 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2625 | struct iscsi_session *session = conn->session; | |
2626 | ||
2627 | switch (flag) { | |
2628 | case STOP_CONN_RECOVER: | |
2629 | case STOP_CONN_TERM: | |
2630 | iscsi_start_session_recovery(session, conn, flag); | |
8d2860b3 | 2631 | break; |
7996a778 | 2632 | default: |
322d739d MC |
2633 | iscsi_conn_printk(KERN_ERR, conn, |
2634 | "invalid stop flag %d\n", flag); | |
7996a778 MC |
2635 | } |
2636 | } | |
2637 | EXPORT_SYMBOL_GPL(iscsi_conn_stop); | |
2638 | ||
2639 | int iscsi_conn_bind(struct iscsi_cls_session *cls_session, | |
2640 | struct iscsi_cls_conn *cls_conn, int is_leading) | |
2641 | { | |
75613521 | 2642 | struct iscsi_session *session = cls_session->dd_data; |
98644047 | 2643 | struct iscsi_conn *conn = cls_conn->dd_data; |
7996a778 | 2644 | |
7996a778 | 2645 | spin_lock_bh(&session->lock); |
7996a778 MC |
2646 | if (is_leading) |
2647 | session->leadconn = conn; | |
98644047 | 2648 | spin_unlock_bh(&session->lock); |
7996a778 MC |
2649 | |
2650 | /* | |
2651 | * Unblock xmitworker(), Login Phase will pass through. | |
2652 | */ | |
2653 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
2654 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
2655 | return 0; | |
2656 | } | |
2657 | EXPORT_SYMBOL_GPL(iscsi_conn_bind); | |
2658 | ||
a54a52ca MC |
2659 | |
2660 | int iscsi_set_param(struct iscsi_cls_conn *cls_conn, | |
2661 | enum iscsi_param param, char *buf, int buflen) | |
2662 | { | |
2663 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2664 | struct iscsi_session *session = conn->session; | |
2665 | uint32_t value; | |
2666 | ||
2667 | switch(param) { | |
843c0a8a MC |
2668 | case ISCSI_PARAM_FAST_ABORT: |
2669 | sscanf(buf, "%d", &session->fast_abort); | |
2670 | break; | |
f6d5180c MC |
2671 | case ISCSI_PARAM_ABORT_TMO: |
2672 | sscanf(buf, "%d", &session->abort_timeout); | |
2673 | break; | |
2674 | case ISCSI_PARAM_LU_RESET_TMO: | |
2675 | sscanf(buf, "%d", &session->lu_reset_timeout); | |
2676 | break; | |
2677 | case ISCSI_PARAM_PING_TMO: | |
2678 | sscanf(buf, "%d", &conn->ping_timeout); | |
2679 | break; | |
2680 | case ISCSI_PARAM_RECV_TMO: | |
2681 | sscanf(buf, "%d", &conn->recv_timeout); | |
2682 | break; | |
a54a52ca MC |
2683 | case ISCSI_PARAM_MAX_RECV_DLENGTH: |
2684 | sscanf(buf, "%d", &conn->max_recv_dlength); | |
2685 | break; | |
2686 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
2687 | sscanf(buf, "%d", &conn->max_xmit_dlength); | |
2688 | break; | |
2689 | case ISCSI_PARAM_HDRDGST_EN: | |
2690 | sscanf(buf, "%d", &conn->hdrdgst_en); | |
2691 | break; | |
2692 | case ISCSI_PARAM_DATADGST_EN: | |
2693 | sscanf(buf, "%d", &conn->datadgst_en); | |
2694 | break; | |
2695 | case ISCSI_PARAM_INITIAL_R2T_EN: | |
2696 | sscanf(buf, "%d", &session->initial_r2t_en); | |
2697 | break; | |
2698 | case ISCSI_PARAM_MAX_R2T: | |
2699 | sscanf(buf, "%d", &session->max_r2t); | |
2700 | break; | |
2701 | case ISCSI_PARAM_IMM_DATA_EN: | |
2702 | sscanf(buf, "%d", &session->imm_data_en); | |
2703 | break; | |
2704 | case ISCSI_PARAM_FIRST_BURST: | |
2705 | sscanf(buf, "%d", &session->first_burst); | |
2706 | break; | |
2707 | case ISCSI_PARAM_MAX_BURST: | |
2708 | sscanf(buf, "%d", &session->max_burst); | |
2709 | break; | |
2710 | case ISCSI_PARAM_PDU_INORDER_EN: | |
2711 | sscanf(buf, "%d", &session->pdu_inorder_en); | |
2712 | break; | |
2713 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
2714 | sscanf(buf, "%d", &session->dataseq_inorder_en); | |
2715 | break; | |
2716 | case ISCSI_PARAM_ERL: | |
2717 | sscanf(buf, "%d", &session->erl); | |
2718 | break; | |
2719 | case ISCSI_PARAM_IFMARKER_EN: | |
2720 | sscanf(buf, "%d", &value); | |
2721 | BUG_ON(value); | |
2722 | break; | |
2723 | case ISCSI_PARAM_OFMARKER_EN: | |
2724 | sscanf(buf, "%d", &value); | |
2725 | BUG_ON(value); | |
2726 | break; | |
2727 | case ISCSI_PARAM_EXP_STATSN: | |
2728 | sscanf(buf, "%u", &conn->exp_statsn); | |
2729 | break; | |
b2c64167 MC |
2730 | case ISCSI_PARAM_USERNAME: |
2731 | kfree(session->username); | |
2732 | session->username = kstrdup(buf, GFP_KERNEL); | |
2733 | if (!session->username) | |
2734 | return -ENOMEM; | |
2735 | break; | |
2736 | case ISCSI_PARAM_USERNAME_IN: | |
2737 | kfree(session->username_in); | |
2738 | session->username_in = kstrdup(buf, GFP_KERNEL); | |
2739 | if (!session->username_in) | |
2740 | return -ENOMEM; | |
2741 | break; | |
2742 | case ISCSI_PARAM_PASSWORD: | |
2743 | kfree(session->password); | |
2744 | session->password = kstrdup(buf, GFP_KERNEL); | |
2745 | if (!session->password) | |
2746 | return -ENOMEM; | |
2747 | break; | |
2748 | case ISCSI_PARAM_PASSWORD_IN: | |
2749 | kfree(session->password_in); | |
2750 | session->password_in = kstrdup(buf, GFP_KERNEL); | |
2751 | if (!session->password_in) | |
2752 | return -ENOMEM; | |
2753 | break; | |
a54a52ca MC |
2754 | case ISCSI_PARAM_TARGET_NAME: |
2755 | /* this should not change between logins */ | |
2756 | if (session->targetname) | |
2757 | break; | |
2758 | ||
2759 | session->targetname = kstrdup(buf, GFP_KERNEL); | |
2760 | if (!session->targetname) | |
2761 | return -ENOMEM; | |
2762 | break; | |
2763 | case ISCSI_PARAM_TPGT: | |
2764 | sscanf(buf, "%d", &session->tpgt); | |
2765 | break; | |
2766 | case ISCSI_PARAM_PERSISTENT_PORT: | |
2767 | sscanf(buf, "%d", &conn->persistent_port); | |
2768 | break; | |
2769 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
2770 | /* | |
2771 | * this is the address returned in discovery so it should | |
2772 | * not change between logins. | |
2773 | */ | |
2774 | if (conn->persistent_address) | |
2775 | break; | |
2776 | ||
2777 | conn->persistent_address = kstrdup(buf, GFP_KERNEL); | |
2778 | if (!conn->persistent_address) | |
2779 | return -ENOMEM; | |
2780 | break; | |
88dfd340 MC |
2781 | case ISCSI_PARAM_IFACE_NAME: |
2782 | if (!session->ifacename) | |
2783 | session->ifacename = kstrdup(buf, GFP_KERNEL); | |
2784 | break; | |
2785 | case ISCSI_PARAM_INITIATOR_NAME: | |
2786 | if (!session->initiatorname) | |
2787 | session->initiatorname = kstrdup(buf, GFP_KERNEL); | |
2788 | break; | |
a54a52ca MC |
2789 | default: |
2790 | return -ENOSYS; | |
2791 | } | |
2792 | ||
2793 | return 0; | |
2794 | } | |
2795 | EXPORT_SYMBOL_GPL(iscsi_set_param); | |
2796 | ||
2797 | int iscsi_session_get_param(struct iscsi_cls_session *cls_session, | |
2798 | enum iscsi_param param, char *buf) | |
2799 | { | |
75613521 | 2800 | struct iscsi_session *session = cls_session->dd_data; |
a54a52ca MC |
2801 | int len; |
2802 | ||
2803 | switch(param) { | |
843c0a8a MC |
2804 | case ISCSI_PARAM_FAST_ABORT: |
2805 | len = sprintf(buf, "%d\n", session->fast_abort); | |
2806 | break; | |
f6d5180c MC |
2807 | case ISCSI_PARAM_ABORT_TMO: |
2808 | len = sprintf(buf, "%d\n", session->abort_timeout); | |
2809 | break; | |
2810 | case ISCSI_PARAM_LU_RESET_TMO: | |
2811 | len = sprintf(buf, "%d\n", session->lu_reset_timeout); | |
2812 | break; | |
a54a52ca MC |
2813 | case ISCSI_PARAM_INITIAL_R2T_EN: |
2814 | len = sprintf(buf, "%d\n", session->initial_r2t_en); | |
2815 | break; | |
2816 | case ISCSI_PARAM_MAX_R2T: | |
2817 | len = sprintf(buf, "%hu\n", session->max_r2t); | |
2818 | break; | |
2819 | case ISCSI_PARAM_IMM_DATA_EN: | |
2820 | len = sprintf(buf, "%d\n", session->imm_data_en); | |
2821 | break; | |
2822 | case ISCSI_PARAM_FIRST_BURST: | |
2823 | len = sprintf(buf, "%u\n", session->first_burst); | |
2824 | break; | |
2825 | case ISCSI_PARAM_MAX_BURST: | |
2826 | len = sprintf(buf, "%u\n", session->max_burst); | |
2827 | break; | |
2828 | case ISCSI_PARAM_PDU_INORDER_EN: | |
2829 | len = sprintf(buf, "%d\n", session->pdu_inorder_en); | |
2830 | break; | |
2831 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
2832 | len = sprintf(buf, "%d\n", session->dataseq_inorder_en); | |
2833 | break; | |
2834 | case ISCSI_PARAM_ERL: | |
2835 | len = sprintf(buf, "%d\n", session->erl); | |
2836 | break; | |
2837 | case ISCSI_PARAM_TARGET_NAME: | |
2838 | len = sprintf(buf, "%s\n", session->targetname); | |
2839 | break; | |
2840 | case ISCSI_PARAM_TPGT: | |
2841 | len = sprintf(buf, "%d\n", session->tpgt); | |
2842 | break; | |
b2c64167 MC |
2843 | case ISCSI_PARAM_USERNAME: |
2844 | len = sprintf(buf, "%s\n", session->username); | |
2845 | break; | |
2846 | case ISCSI_PARAM_USERNAME_IN: | |
2847 | len = sprintf(buf, "%s\n", session->username_in); | |
2848 | break; | |
2849 | case ISCSI_PARAM_PASSWORD: | |
2850 | len = sprintf(buf, "%s\n", session->password); | |
2851 | break; | |
2852 | case ISCSI_PARAM_PASSWORD_IN: | |
2853 | len = sprintf(buf, "%s\n", session->password_in); | |
2854 | break; | |
88dfd340 MC |
2855 | case ISCSI_PARAM_IFACE_NAME: |
2856 | len = sprintf(buf, "%s\n", session->ifacename); | |
2857 | break; | |
2858 | case ISCSI_PARAM_INITIATOR_NAME: | |
2859 | if (!session->initiatorname) | |
2860 | len = sprintf(buf, "%s\n", "unknown"); | |
2861 | else | |
2862 | len = sprintf(buf, "%s\n", session->initiatorname); | |
2863 | break; | |
a54a52ca MC |
2864 | default: |
2865 | return -ENOSYS; | |
2866 | } | |
2867 | ||
2868 | return len; | |
2869 | } | |
2870 | EXPORT_SYMBOL_GPL(iscsi_session_get_param); | |
2871 | ||
2872 | int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn, | |
2873 | enum iscsi_param param, char *buf) | |
2874 | { | |
2875 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2876 | int len; | |
2877 | ||
2878 | switch(param) { | |
f6d5180c MC |
2879 | case ISCSI_PARAM_PING_TMO: |
2880 | len = sprintf(buf, "%u\n", conn->ping_timeout); | |
2881 | break; | |
2882 | case ISCSI_PARAM_RECV_TMO: | |
2883 | len = sprintf(buf, "%u\n", conn->recv_timeout); | |
2884 | break; | |
a54a52ca MC |
2885 | case ISCSI_PARAM_MAX_RECV_DLENGTH: |
2886 | len = sprintf(buf, "%u\n", conn->max_recv_dlength); | |
2887 | break; | |
2888 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
2889 | len = sprintf(buf, "%u\n", conn->max_xmit_dlength); | |
2890 | break; | |
2891 | case ISCSI_PARAM_HDRDGST_EN: | |
2892 | len = sprintf(buf, "%d\n", conn->hdrdgst_en); | |
2893 | break; | |
2894 | case ISCSI_PARAM_DATADGST_EN: | |
2895 | len = sprintf(buf, "%d\n", conn->datadgst_en); | |
2896 | break; | |
2897 | case ISCSI_PARAM_IFMARKER_EN: | |
2898 | len = sprintf(buf, "%d\n", conn->ifmarker_en); | |
2899 | break; | |
2900 | case ISCSI_PARAM_OFMARKER_EN: | |
2901 | len = sprintf(buf, "%d\n", conn->ofmarker_en); | |
2902 | break; | |
2903 | case ISCSI_PARAM_EXP_STATSN: | |
2904 | len = sprintf(buf, "%u\n", conn->exp_statsn); | |
2905 | break; | |
2906 | case ISCSI_PARAM_PERSISTENT_PORT: | |
2907 | len = sprintf(buf, "%d\n", conn->persistent_port); | |
2908 | break; | |
2909 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
2910 | len = sprintf(buf, "%s\n", conn->persistent_address); | |
2911 | break; | |
2912 | default: | |
2913 | return -ENOSYS; | |
2914 | } | |
2915 | ||
2916 | return len; | |
2917 | } | |
2918 | EXPORT_SYMBOL_GPL(iscsi_conn_get_param); | |
2919 | ||
0801c242 MC |
2920 | int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param, |
2921 | char *buf) | |
2922 | { | |
75613521 | 2923 | struct iscsi_host *ihost = shost_priv(shost); |
0801c242 MC |
2924 | int len; |
2925 | ||
2926 | switch (param) { | |
d8196ed2 | 2927 | case ISCSI_HOST_PARAM_NETDEV_NAME: |
75613521 | 2928 | if (!ihost->netdev) |
d8196ed2 MC |
2929 | len = sprintf(buf, "%s\n", "default"); |
2930 | else | |
75613521 | 2931 | len = sprintf(buf, "%s\n", ihost->netdev); |
d8196ed2 | 2932 | break; |
0801c242 | 2933 | case ISCSI_HOST_PARAM_HWADDRESS: |
75613521 | 2934 | if (!ihost->hwaddress) |
0801c242 MC |
2935 | len = sprintf(buf, "%s\n", "default"); |
2936 | else | |
75613521 | 2937 | len = sprintf(buf, "%s\n", ihost->hwaddress); |
0801c242 | 2938 | break; |
8ad5781a | 2939 | case ISCSI_HOST_PARAM_INITIATOR_NAME: |
75613521 | 2940 | if (!ihost->initiatorname) |
8ad5781a MC |
2941 | len = sprintf(buf, "%s\n", "unknown"); |
2942 | else | |
75613521 | 2943 | len = sprintf(buf, "%s\n", ihost->initiatorname); |
8ad5781a | 2944 | break; |
75613521 MC |
2945 | case ISCSI_HOST_PARAM_IPADDRESS: |
2946 | if (!strlen(ihost->local_address)) | |
2947 | len = sprintf(buf, "%s\n", "unknown"); | |
2948 | else | |
2949 | len = sprintf(buf, "%s\n", | |
2950 | ihost->local_address); | |
88dfd340 | 2951 | break; |
0801c242 MC |
2952 | default: |
2953 | return -ENOSYS; | |
2954 | } | |
2955 | ||
2956 | return len; | |
2957 | } | |
2958 | EXPORT_SYMBOL_GPL(iscsi_host_get_param); | |
2959 | ||
2960 | int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param, | |
2961 | char *buf, int buflen) | |
2962 | { | |
75613521 | 2963 | struct iscsi_host *ihost = shost_priv(shost); |
0801c242 MC |
2964 | |
2965 | switch (param) { | |
d8196ed2 | 2966 | case ISCSI_HOST_PARAM_NETDEV_NAME: |
75613521 MC |
2967 | if (!ihost->netdev) |
2968 | ihost->netdev = kstrdup(buf, GFP_KERNEL); | |
d8196ed2 | 2969 | break; |
0801c242 | 2970 | case ISCSI_HOST_PARAM_HWADDRESS: |
75613521 MC |
2971 | if (!ihost->hwaddress) |
2972 | ihost->hwaddress = kstrdup(buf, GFP_KERNEL); | |
0801c242 | 2973 | break; |
8ad5781a | 2974 | case ISCSI_HOST_PARAM_INITIATOR_NAME: |
75613521 MC |
2975 | if (!ihost->initiatorname) |
2976 | ihost->initiatorname = kstrdup(buf, GFP_KERNEL); | |
8ad5781a | 2977 | break; |
0801c242 MC |
2978 | default: |
2979 | return -ENOSYS; | |
2980 | } | |
2981 | ||
2982 | return 0; | |
2983 | } | |
2984 | EXPORT_SYMBOL_GPL(iscsi_host_set_param); | |
2985 | ||
7996a778 MC |
2986 | MODULE_AUTHOR("Mike Christie"); |
2987 | MODULE_DESCRIPTION("iSCSI library functions"); | |
2988 | MODULE_LICENSE("GPL"); |