Commit | Line | Data |
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7996a778 MC |
1 | /* |
2 | * iSCSI lib functions | |
3 | * | |
4 | * Copyright (C) 2006 Red Hat, Inc. All rights reserved. | |
5 | * Copyright (C) 2004 - 2006 Mike Christie | |
6 | * Copyright (C) 2004 - 2005 Dmitry Yusupov | |
7 | * Copyright (C) 2004 - 2005 Alex Aizman | |
8 | * maintained by open-iscsi@googlegroups.com | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
23 | */ | |
24 | #include <linux/types.h> | |
7996a778 MC |
25 | #include <linux/kfifo.h> |
26 | #include <linux/delay.h> | |
11836572 | 27 | #include <linux/log2.h> |
8eb00539 | 28 | #include <asm/unaligned.h> |
7996a778 MC |
29 | #include <net/tcp.h> |
30 | #include <scsi/scsi_cmnd.h> | |
31 | #include <scsi/scsi_device.h> | |
32 | #include <scsi/scsi_eh.h> | |
33 | #include <scsi/scsi_tcq.h> | |
34 | #include <scsi/scsi_host.h> | |
35 | #include <scsi/scsi.h> | |
36 | #include <scsi/iscsi_proto.h> | |
37 | #include <scsi/scsi_transport.h> | |
38 | #include <scsi/scsi_transport_iscsi.h> | |
39 | #include <scsi/libiscsi.h> | |
40 | ||
1b2c7af8 MC |
41 | static int iscsi_dbg_lib; |
42 | module_param_named(debug_libiscsi, iscsi_dbg_lib, int, S_IRUGO | S_IWUSR); | |
43 | MODULE_PARM_DESC(debug_libiscsi, "Turn on debugging for libiscsi module. " | |
44 | "Set to 1 to turn on, and zero to turn off. Default " | |
45 | "is off."); | |
46 | ||
47 | #define ISCSI_DBG_CONN(_conn, dbg_fmt, arg...) \ | |
48 | do { \ | |
49 | if (iscsi_dbg_lib) \ | |
50 | iscsi_conn_printk(KERN_INFO, _conn, \ | |
51 | "%s " dbg_fmt, \ | |
52 | __func__, ##arg); \ | |
53 | } while (0); | |
54 | ||
55 | #define ISCSI_DBG_SESSION(_session, dbg_fmt, arg...) \ | |
56 | do { \ | |
57 | if (iscsi_dbg_lib) \ | |
58 | iscsi_session_printk(KERN_INFO, _session, \ | |
59 | "%s " dbg_fmt, \ | |
60 | __func__, ##arg); \ | |
61 | } while (0); | |
62 | ||
77a23c21 MC |
63 | /* Serial Number Arithmetic, 32 bits, less than, RFC1982 */ |
64 | #define SNA32_CHECK 2147483648UL | |
7996a778 | 65 | |
77a23c21 MC |
66 | static int iscsi_sna_lt(u32 n1, u32 n2) |
67 | { | |
68 | return n1 != n2 && ((n1 < n2 && (n2 - n1 < SNA32_CHECK)) || | |
69 | (n1 > n2 && (n2 - n1 < SNA32_CHECK))); | |
70 | } | |
71 | ||
72 | /* Serial Number Arithmetic, 32 bits, less than, RFC1982 */ | |
73 | static int iscsi_sna_lte(u32 n1, u32 n2) | |
74 | { | |
75 | return n1 == n2 || ((n1 < n2 && (n2 - n1 < SNA32_CHECK)) || | |
76 | (n1 > n2 && (n2 - n1 < SNA32_CHECK))); | |
77 | } | |
78 | ||
79 | void | |
80 | iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr) | |
7996a778 MC |
81 | { |
82 | uint32_t max_cmdsn = be32_to_cpu(hdr->max_cmdsn); | |
83 | uint32_t exp_cmdsn = be32_to_cpu(hdr->exp_cmdsn); | |
84 | ||
77a23c21 MC |
85 | /* |
86 | * standard specifies this check for when to update expected and | |
87 | * max sequence numbers | |
88 | */ | |
89 | if (iscsi_sna_lt(max_cmdsn, exp_cmdsn - 1)) | |
90 | return; | |
91 | ||
92 | if (exp_cmdsn != session->exp_cmdsn && | |
93 | !iscsi_sna_lt(exp_cmdsn, session->exp_cmdsn)) | |
7996a778 MC |
94 | session->exp_cmdsn = exp_cmdsn; |
95 | ||
77a23c21 MC |
96 | if (max_cmdsn != session->max_cmdsn && |
97 | !iscsi_sna_lt(max_cmdsn, session->max_cmdsn)) { | |
98 | session->max_cmdsn = max_cmdsn; | |
99 | /* | |
100 | * if the window closed with IO queued, then kick the | |
101 | * xmit thread | |
102 | */ | |
103 | if (!list_empty(&session->leadconn->xmitqueue) || | |
052d0144 MC |
104 | !list_empty(&session->leadconn->mgmtqueue)) { |
105 | if (!(session->tt->caps & CAP_DATA_PATH_OFFLOAD)) | |
106 | scsi_queue_work(session->host, | |
107 | &session->leadconn->xmitwork); | |
108 | } | |
77a23c21 | 109 | } |
7996a778 | 110 | } |
77a23c21 | 111 | EXPORT_SYMBOL_GPL(iscsi_update_cmdsn); |
7996a778 | 112 | |
577577da MC |
113 | /** |
114 | * iscsi_prep_data_out_pdu - initialize Data-Out | |
115 | * @task: scsi command task | |
116 | * @r2t: R2T info | |
117 | * @hdr: iscsi data in pdu | |
118 | * | |
119 | * Notes: | |
120 | * Initialize Data-Out within this R2T sequence and finds | |
121 | * proper data_offset within this SCSI command. | |
122 | * | |
123 | * This function is called with connection lock taken. | |
124 | **/ | |
125 | void iscsi_prep_data_out_pdu(struct iscsi_task *task, struct iscsi_r2t_info *r2t, | |
126 | struct iscsi_data *hdr) | |
7996a778 | 127 | { |
9c19a7d0 | 128 | struct iscsi_conn *conn = task->conn; |
577577da MC |
129 | unsigned int left = r2t->data_length - r2t->sent; |
130 | ||
131 | task->hdr_len = sizeof(struct iscsi_data); | |
7996a778 MC |
132 | |
133 | memset(hdr, 0, sizeof(struct iscsi_data)); | |
577577da MC |
134 | hdr->ttt = r2t->ttt; |
135 | hdr->datasn = cpu_to_be32(r2t->datasn); | |
136 | r2t->datasn++; | |
7996a778 | 137 | hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; |
577577da MC |
138 | memcpy(hdr->lun, task->lun, sizeof(hdr->lun)); |
139 | hdr->itt = task->hdr_itt; | |
140 | hdr->exp_statsn = r2t->exp_statsn; | |
141 | hdr->offset = cpu_to_be32(r2t->data_offset + r2t->sent); | |
142 | if (left > conn->max_xmit_dlength) { | |
7996a778 | 143 | hton24(hdr->dlength, conn->max_xmit_dlength); |
577577da | 144 | r2t->data_count = conn->max_xmit_dlength; |
7996a778 MC |
145 | hdr->flags = 0; |
146 | } else { | |
577577da MC |
147 | hton24(hdr->dlength, left); |
148 | r2t->data_count = left; | |
7996a778 MC |
149 | hdr->flags = ISCSI_FLAG_CMD_FINAL; |
150 | } | |
577577da | 151 | conn->dataout_pdus_cnt++; |
7996a778 | 152 | } |
577577da | 153 | EXPORT_SYMBOL_GPL(iscsi_prep_data_out_pdu); |
7996a778 | 154 | |
9c19a7d0 | 155 | static int iscsi_add_hdr(struct iscsi_task *task, unsigned len) |
004d6530 | 156 | { |
9c19a7d0 | 157 | unsigned exp_len = task->hdr_len + len; |
004d6530 | 158 | |
9c19a7d0 | 159 | if (exp_len > task->hdr_max) { |
004d6530 BH |
160 | WARN_ON(1); |
161 | return -EINVAL; | |
162 | } | |
163 | ||
164 | WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */ | |
9c19a7d0 | 165 | task->hdr_len = exp_len; |
004d6530 BH |
166 | return 0; |
167 | } | |
168 | ||
38d1c069 BH |
169 | /* |
170 | * make an extended cdb AHS | |
171 | */ | |
9c19a7d0 | 172 | static int iscsi_prep_ecdb_ahs(struct iscsi_task *task) |
38d1c069 | 173 | { |
9c19a7d0 | 174 | struct scsi_cmnd *cmd = task->sc; |
38d1c069 BH |
175 | unsigned rlen, pad_len; |
176 | unsigned short ahslength; | |
177 | struct iscsi_ecdb_ahdr *ecdb_ahdr; | |
178 | int rc; | |
179 | ||
9c19a7d0 | 180 | ecdb_ahdr = iscsi_next_hdr(task); |
38d1c069 BH |
181 | rlen = cmd->cmd_len - ISCSI_CDB_SIZE; |
182 | ||
183 | BUG_ON(rlen > sizeof(ecdb_ahdr->ecdb)); | |
184 | ahslength = rlen + sizeof(ecdb_ahdr->reserved); | |
185 | ||
186 | pad_len = iscsi_padding(rlen); | |
187 | ||
9c19a7d0 | 188 | rc = iscsi_add_hdr(task, sizeof(ecdb_ahdr->ahslength) + |
38d1c069 BH |
189 | sizeof(ecdb_ahdr->ahstype) + ahslength + pad_len); |
190 | if (rc) | |
191 | return rc; | |
192 | ||
193 | if (pad_len) | |
194 | memset(&ecdb_ahdr->ecdb[rlen], 0, pad_len); | |
195 | ||
196 | ecdb_ahdr->ahslength = cpu_to_be16(ahslength); | |
197 | ecdb_ahdr->ahstype = ISCSI_AHSTYPE_CDB; | |
198 | ecdb_ahdr->reserved = 0; | |
199 | memcpy(ecdb_ahdr->ecdb, cmd->cmnd + ISCSI_CDB_SIZE, rlen); | |
200 | ||
1b2c7af8 MC |
201 | ISCSI_DBG_SESSION(task->conn->session, |
202 | "iscsi_prep_ecdb_ahs: varlen_cdb_len %d " | |
203 | "rlen %d pad_len %d ahs_length %d iscsi_headers_size " | |
204 | "%u\n", cmd->cmd_len, rlen, pad_len, ahslength, | |
205 | task->hdr_len); | |
38d1c069 BH |
206 | return 0; |
207 | } | |
208 | ||
9c19a7d0 | 209 | static int iscsi_prep_bidi_ahs(struct iscsi_task *task) |
c07d4444 | 210 | { |
9c19a7d0 | 211 | struct scsi_cmnd *sc = task->sc; |
c07d4444 BH |
212 | struct iscsi_rlength_ahdr *rlen_ahdr; |
213 | int rc; | |
214 | ||
9c19a7d0 MC |
215 | rlen_ahdr = iscsi_next_hdr(task); |
216 | rc = iscsi_add_hdr(task, sizeof(*rlen_ahdr)); | |
c07d4444 BH |
217 | if (rc) |
218 | return rc; | |
219 | ||
220 | rlen_ahdr->ahslength = | |
221 | cpu_to_be16(sizeof(rlen_ahdr->read_length) + | |
222 | sizeof(rlen_ahdr->reserved)); | |
223 | rlen_ahdr->ahstype = ISCSI_AHSTYPE_RLENGTH; | |
224 | rlen_ahdr->reserved = 0; | |
225 | rlen_ahdr->read_length = cpu_to_be32(scsi_in(sc)->length); | |
226 | ||
1b2c7af8 MC |
227 | ISCSI_DBG_SESSION(task->conn->session, |
228 | "bidi-in rlen_ahdr->read_length(%d) " | |
229 | "rlen_ahdr->ahslength(%d)\n", | |
230 | be32_to_cpu(rlen_ahdr->read_length), | |
231 | be16_to_cpu(rlen_ahdr->ahslength)); | |
c07d4444 BH |
232 | return 0; |
233 | } | |
234 | ||
7996a778 MC |
235 | /** |
236 | * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu | |
9c19a7d0 | 237 | * @task: iscsi task |
7996a778 MC |
238 | * |
239 | * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set | |
240 | * fields like dlength or final based on how much data it sends | |
241 | */ | |
9c19a7d0 | 242 | static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task) |
7996a778 | 243 | { |
9c19a7d0 | 244 | struct iscsi_conn *conn = task->conn; |
7996a778 | 245 | struct iscsi_session *session = conn->session; |
9c19a7d0 | 246 | struct scsi_cmnd *sc = task->sc; |
577577da | 247 | struct iscsi_cmd *hdr; |
38d1c069 | 248 | unsigned hdrlength, cmd_len; |
262ef636 | 249 | itt_t itt; |
004d6530 | 250 | int rc; |
7996a778 | 251 | |
2ff79d52 | 252 | rc = conn->session->tt->alloc_pdu(task, ISCSI_OP_SCSI_CMD); |
577577da MC |
253 | if (rc) |
254 | return rc; | |
255 | hdr = (struct iscsi_cmd *) task->hdr; | |
262ef636 | 256 | itt = hdr->itt; |
577577da MC |
257 | memset(hdr, 0, sizeof(*hdr)); |
258 | ||
2ff79d52 MC |
259 | if (session->tt->parse_pdu_itt) |
260 | hdr->itt = task->hdr_itt = itt; | |
261 | else | |
262 | hdr->itt = task->hdr_itt = build_itt(task->itt, | |
263 | task->conn->session->age); | |
9c19a7d0 MC |
264 | task->hdr_len = 0; |
265 | rc = iscsi_add_hdr(task, sizeof(*hdr)); | |
004d6530 BH |
266 | if (rc) |
267 | return rc; | |
a8ac6311 OK |
268 | hdr->opcode = ISCSI_OP_SCSI_CMD; |
269 | hdr->flags = ISCSI_ATTR_SIMPLE; | |
270 | int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun); | |
577577da | 271 | memcpy(task->lun, hdr->lun, sizeof(task->lun)); |
577577da | 272 | hdr->cmdsn = task->cmdsn = cpu_to_be32(session->cmdsn); |
a8ac6311 OK |
273 | session->cmdsn++; |
274 | hdr->exp_statsn = cpu_to_be32(conn->exp_statsn); | |
38d1c069 BH |
275 | cmd_len = sc->cmd_len; |
276 | if (cmd_len < ISCSI_CDB_SIZE) | |
277 | memset(&hdr->cdb[cmd_len], 0, ISCSI_CDB_SIZE - cmd_len); | |
278 | else if (cmd_len > ISCSI_CDB_SIZE) { | |
9c19a7d0 | 279 | rc = iscsi_prep_ecdb_ahs(task); |
38d1c069 BH |
280 | if (rc) |
281 | return rc; | |
282 | cmd_len = ISCSI_CDB_SIZE; | |
283 | } | |
284 | memcpy(hdr->cdb, sc->cmnd, cmd_len); | |
7996a778 | 285 | |
9c19a7d0 | 286 | task->imm_count = 0; |
c07d4444 BH |
287 | if (scsi_bidi_cmnd(sc)) { |
288 | hdr->flags |= ISCSI_FLAG_CMD_READ; | |
9c19a7d0 | 289 | rc = iscsi_prep_bidi_ahs(task); |
c07d4444 BH |
290 | if (rc) |
291 | return rc; | |
292 | } | |
7996a778 | 293 | if (sc->sc_data_direction == DMA_TO_DEVICE) { |
c07d4444 | 294 | unsigned out_len = scsi_out(sc)->length; |
577577da MC |
295 | struct iscsi_r2t_info *r2t = &task->unsol_r2t; |
296 | ||
c07d4444 | 297 | hdr->data_length = cpu_to_be32(out_len); |
7996a778 MC |
298 | hdr->flags |= ISCSI_FLAG_CMD_WRITE; |
299 | /* | |
300 | * Write counters: | |
301 | * | |
302 | * imm_count bytes to be sent right after | |
303 | * SCSI PDU Header | |
304 | * | |
305 | * unsol_count bytes(as Data-Out) to be sent | |
306 | * without R2T ack right after | |
307 | * immediate data | |
308 | * | |
577577da | 309 | * r2t data_length bytes to be sent via R2T ack's |
7996a778 MC |
310 | * |
311 | * pad_count bytes to be sent as zero-padding | |
312 | */ | |
577577da | 313 | memset(r2t, 0, sizeof(*r2t)); |
7996a778 MC |
314 | |
315 | if (session->imm_data_en) { | |
c07d4444 | 316 | if (out_len >= session->first_burst) |
9c19a7d0 | 317 | task->imm_count = min(session->first_burst, |
7996a778 MC |
318 | conn->max_xmit_dlength); |
319 | else | |
9c19a7d0 | 320 | task->imm_count = min(out_len, |
7996a778 | 321 | conn->max_xmit_dlength); |
9c19a7d0 | 322 | hton24(hdr->dlength, task->imm_count); |
7996a778 | 323 | } else |
a8ac6311 | 324 | zero_data(hdr->dlength); |
7996a778 | 325 | |
ffd0436e | 326 | if (!session->initial_r2t_en) { |
577577da MC |
327 | r2t->data_length = min(session->first_burst, out_len) - |
328 | task->imm_count; | |
329 | r2t->data_offset = task->imm_count; | |
330 | r2t->ttt = cpu_to_be32(ISCSI_RESERVED_TAG); | |
331 | r2t->exp_statsn = cpu_to_be32(conn->exp_statsn); | |
ffd0436e MC |
332 | } |
333 | ||
577577da | 334 | if (!task->unsol_r2t.data_length) |
7996a778 | 335 | /* No unsolicit Data-Out's */ |
a8ac6311 | 336 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; |
7996a778 | 337 | } else { |
7996a778 MC |
338 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; |
339 | zero_data(hdr->dlength); | |
c07d4444 | 340 | hdr->data_length = cpu_to_be32(scsi_in(sc)->length); |
7996a778 MC |
341 | |
342 | if (sc->sc_data_direction == DMA_FROM_DEVICE) | |
343 | hdr->flags |= ISCSI_FLAG_CMD_READ; | |
344 | } | |
345 | ||
004d6530 | 346 | /* calculate size of additional header segments (AHSs) */ |
9c19a7d0 | 347 | hdrlength = task->hdr_len - sizeof(*hdr); |
004d6530 BH |
348 | |
349 | WARN_ON(hdrlength & (ISCSI_PAD_LEN-1)); | |
350 | hdrlength /= ISCSI_PAD_LEN; | |
351 | ||
352 | WARN_ON(hdrlength >= 256); | |
353 | hdr->hlength = hdrlength & 0xFF; | |
354 | ||
577577da | 355 | if (session->tt->init_task && session->tt->init_task(task)) |
052d0144 MC |
356 | return -EIO; |
357 | ||
9c19a7d0 MC |
358 | task->state = ISCSI_TASK_RUNNING; |
359 | list_move_tail(&task->running, &conn->run_list); | |
77a23c21 | 360 | |
a8ac6311 | 361 | conn->scsicmd_pdus_cnt++; |
1b2c7af8 MC |
362 | ISCSI_DBG_SESSION(session, "iscsi prep [%s cid %d sc %p cdb 0x%x " |
363 | "itt 0x%x len %d bidi_len %d cmdsn %d win %d]\n", | |
364 | scsi_bidi_cmnd(sc) ? "bidirectional" : | |
365 | sc->sc_data_direction == DMA_TO_DEVICE ? | |
366 | "write" : "read", conn->id, sc, sc->cmnd[0], | |
367 | task->itt, scsi_bufflen(sc), | |
368 | scsi_bidi_cmnd(sc) ? scsi_in(sc)->length : 0, | |
369 | session->cmdsn, | |
370 | session->max_cmdsn - session->exp_cmdsn + 1); | |
004d6530 | 371 | return 0; |
7996a778 | 372 | } |
7996a778 MC |
373 | |
374 | /** | |
3e5c28ad | 375 | * iscsi_complete_command - finish a task |
9c19a7d0 | 376 | * @task: iscsi cmd task |
7996a778 MC |
377 | * |
378 | * Must be called with session lock. | |
3e5c28ad MC |
379 | * This function returns the scsi command to scsi-ml or cleans |
380 | * up mgmt tasks then returns the task to the pool. | |
7996a778 | 381 | */ |
9c19a7d0 | 382 | static void iscsi_complete_command(struct iscsi_task *task) |
7996a778 | 383 | { |
9c19a7d0 | 384 | struct iscsi_conn *conn = task->conn; |
c1635cb7 | 385 | struct iscsi_session *session = conn->session; |
9c19a7d0 | 386 | struct scsi_cmnd *sc = task->sc; |
7996a778 | 387 | |
577577da | 388 | session->tt->cleanup_task(task); |
9c19a7d0 MC |
389 | list_del_init(&task->running); |
390 | task->state = ISCSI_TASK_COMPLETED; | |
391 | task->sc = NULL; | |
3e5c28ad | 392 | |
9c19a7d0 MC |
393 | if (conn->task == task) |
394 | conn->task = NULL; | |
3e5c28ad | 395 | /* |
9c19a7d0 | 396 | * login task is preallocated so do not free |
3e5c28ad | 397 | */ |
9c19a7d0 | 398 | if (conn->login_task == task) |
3e5c28ad MC |
399 | return; |
400 | ||
9c19a7d0 | 401 | __kfifo_put(session->cmdpool.queue, (void*)&task, sizeof(void*)); |
052d0144 | 402 | |
9c19a7d0 MC |
403 | if (conn->ping_task == task) |
404 | conn->ping_task = NULL; | |
3e5c28ad MC |
405 | |
406 | if (sc) { | |
9c19a7d0 | 407 | task->sc = NULL; |
3e5c28ad MC |
408 | /* SCSI eh reuses commands to verify us */ |
409 | sc->SCp.ptr = NULL; | |
410 | /* | |
411 | * queue command may call this to free the task, but | |
412 | * not have setup the sc callback | |
413 | */ | |
414 | if (sc->scsi_done) | |
415 | sc->scsi_done(sc); | |
416 | } | |
7996a778 MC |
417 | } |
418 | ||
913e5bf4 | 419 | void __iscsi_get_task(struct iscsi_task *task) |
60ecebf5 | 420 | { |
9c19a7d0 | 421 | atomic_inc(&task->refcount); |
60ecebf5 | 422 | } |
913e5bf4 | 423 | EXPORT_SYMBOL_GPL(__iscsi_get_task); |
60ecebf5 | 424 | |
9c19a7d0 | 425 | static void __iscsi_put_task(struct iscsi_task *task) |
60ecebf5 | 426 | { |
9c19a7d0 MC |
427 | if (atomic_dec_and_test(&task->refcount)) |
428 | iscsi_complete_command(task); | |
60ecebf5 MC |
429 | } |
430 | ||
9c19a7d0 | 431 | void iscsi_put_task(struct iscsi_task *task) |
3e5c28ad | 432 | { |
9c19a7d0 | 433 | struct iscsi_session *session = task->conn->session; |
3e5c28ad MC |
434 | |
435 | spin_lock_bh(&session->lock); | |
9c19a7d0 | 436 | __iscsi_put_task(task); |
3e5c28ad MC |
437 | spin_unlock_bh(&session->lock); |
438 | } | |
9c19a7d0 | 439 | EXPORT_SYMBOL_GPL(iscsi_put_task); |
3e5c28ad | 440 | |
b3a7ea8d MC |
441 | /* |
442 | * session lock must be held | |
443 | */ | |
9c19a7d0 | 444 | static void fail_command(struct iscsi_conn *conn, struct iscsi_task *task, |
b3a7ea8d MC |
445 | int err) |
446 | { | |
447 | struct scsi_cmnd *sc; | |
448 | ||
9c19a7d0 | 449 | sc = task->sc; |
b3a7ea8d MC |
450 | if (!sc) |
451 | return; | |
452 | ||
9c19a7d0 | 453 | if (task->state == ISCSI_TASK_PENDING) |
b3a7ea8d MC |
454 | /* |
455 | * cmd never made it to the xmit thread, so we should not count | |
456 | * the cmd in the sequencing | |
457 | */ | |
458 | conn->session->queued_cmdsn--; | |
b3a7ea8d MC |
459 | |
460 | sc->result = err; | |
c07d4444 BH |
461 | if (!scsi_bidi_cmnd(sc)) |
462 | scsi_set_resid(sc, scsi_bufflen(sc)); | |
463 | else { | |
464 | scsi_out(sc)->resid = scsi_out(sc)->length; | |
465 | scsi_in(sc)->resid = scsi_in(sc)->length; | |
466 | } | |
3e5c28ad | 467 | |
9c19a7d0 MC |
468 | if (conn->task == task) |
469 | conn->task = NULL; | |
b3a7ea8d | 470 | /* release ref from queuecommand */ |
9c19a7d0 | 471 | __iscsi_put_task(task); |
b3a7ea8d MC |
472 | } |
473 | ||
3e5c28ad | 474 | static int iscsi_prep_mgmt_task(struct iscsi_conn *conn, |
9c19a7d0 | 475 | struct iscsi_task *task) |
052d0144 MC |
476 | { |
477 | struct iscsi_session *session = conn->session; | |
577577da | 478 | struct iscsi_hdr *hdr = task->hdr; |
052d0144 MC |
479 | struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr; |
480 | ||
481 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) | |
482 | return -ENOTCONN; | |
483 | ||
484 | if (hdr->opcode != (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) && | |
485 | hdr->opcode != (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE)) | |
486 | nop->exp_statsn = cpu_to_be32(conn->exp_statsn); | |
487 | /* | |
488 | * pre-format CmdSN for outgoing PDU. | |
489 | */ | |
490 | nop->cmdsn = cpu_to_be32(session->cmdsn); | |
491 | if (hdr->itt != RESERVED_ITT) { | |
052d0144 MC |
492 | /* |
493 | * TODO: We always use immediate, so we never hit this. | |
494 | * If we start to send tmfs or nops as non-immediate then | |
495 | * we should start checking the cmdsn numbers for mgmt tasks. | |
496 | */ | |
497 | if (conn->c_stage == ISCSI_CONN_STARTED && | |
498 | !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { | |
499 | session->queued_cmdsn++; | |
500 | session->cmdsn++; | |
501 | } | |
502 | } | |
503 | ||
ae15f801 MC |
504 | if (session->tt->init_task && session->tt->init_task(task)) |
505 | return -EIO; | |
052d0144 MC |
506 | |
507 | if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT) | |
508 | session->state = ISCSI_STATE_LOGGING_OUT; | |
509 | ||
577577da | 510 | task->state = ISCSI_TASK_RUNNING; |
9c19a7d0 | 511 | list_move_tail(&task->running, &conn->mgmt_run_list); |
1b2c7af8 MC |
512 | ISCSI_DBG_SESSION(session, "mgmtpdu [op 0x%x hdr->itt 0x%x " |
513 | "datalen %d]\n", hdr->opcode & ISCSI_OPCODE_MASK, | |
514 | hdr->itt, task->data_count); | |
052d0144 MC |
515 | return 0; |
516 | } | |
517 | ||
9c19a7d0 | 518 | static struct iscsi_task * |
f6d5180c MC |
519 | __iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
520 | char *data, uint32_t data_size) | |
521 | { | |
522 | struct iscsi_session *session = conn->session; | |
9c19a7d0 | 523 | struct iscsi_task *task; |
262ef636 | 524 | itt_t itt; |
f6d5180c MC |
525 | |
526 | if (session->state == ISCSI_STATE_TERMINATE) | |
527 | return NULL; | |
528 | ||
529 | if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) || | |
530 | hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE)) | |
531 | /* | |
532 | * Login and Text are sent serially, in | |
533 | * request-followed-by-response sequence. | |
3e5c28ad MC |
534 | * Same task can be used. Same ITT must be used. |
535 | * Note that login_task is preallocated at conn_create(). | |
f6d5180c | 536 | */ |
9c19a7d0 | 537 | task = conn->login_task; |
f6d5180c MC |
538 | else { |
539 | BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE); | |
540 | BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED); | |
541 | ||
3e5c28ad | 542 | if (!__kfifo_get(session->cmdpool.queue, |
9c19a7d0 | 543 | (void*)&task, sizeof(void*))) |
f6d5180c MC |
544 | return NULL; |
545 | } | |
3e5c28ad MC |
546 | /* |
547 | * released in complete pdu for task we expect a response for, and | |
548 | * released by the lld when it has transmitted the task for | |
549 | * pdus we do not expect a response for. | |
550 | */ | |
9c19a7d0 MC |
551 | atomic_set(&task->refcount, 1); |
552 | task->conn = conn; | |
553 | task->sc = NULL; | |
f6d5180c MC |
554 | |
555 | if (data_size) { | |
9c19a7d0 MC |
556 | memcpy(task->data, data, data_size); |
557 | task->data_count = data_size; | |
f6d5180c | 558 | } else |
9c19a7d0 | 559 | task->data_count = 0; |
f6d5180c | 560 | |
2ff79d52 | 561 | if (conn->session->tt->alloc_pdu(task, hdr->opcode)) { |
577577da MC |
562 | iscsi_conn_printk(KERN_ERR, conn, "Could not allocate " |
563 | "pdu for mgmt task.\n"); | |
564 | goto requeue_task; | |
565 | } | |
262ef636 | 566 | itt = task->hdr->itt; |
577577da | 567 | task->hdr_len = sizeof(struct iscsi_hdr); |
9c19a7d0 | 568 | memcpy(task->hdr, hdr, sizeof(struct iscsi_hdr)); |
262ef636 MC |
569 | |
570 | if (hdr->itt != RESERVED_ITT) { | |
571 | if (session->tt->parse_pdu_itt) | |
572 | task->hdr->itt = itt; | |
573 | else | |
574 | task->hdr->itt = build_itt(task->itt, | |
575 | task->conn->session->age); | |
576 | } | |
577 | ||
9c19a7d0 MC |
578 | INIT_LIST_HEAD(&task->running); |
579 | list_add_tail(&task->running, &conn->mgmtqueue); | |
052d0144 MC |
580 | |
581 | if (session->tt->caps & CAP_DATA_PATH_OFFLOAD) { | |
577577da MC |
582 | if (iscsi_prep_mgmt_task(conn, task)) |
583 | goto free_task; | |
052d0144 | 584 | |
9c19a7d0 | 585 | if (session->tt->xmit_task(task)) |
577577da | 586 | goto free_task; |
052d0144 MC |
587 | |
588 | } else | |
589 | scsi_queue_work(conn->session->host, &conn->xmitwork); | |
590 | ||
9c19a7d0 | 591 | return task; |
577577da MC |
592 | |
593 | free_task: | |
594 | __iscsi_put_task(task); | |
595 | return NULL; | |
596 | ||
597 | requeue_task: | |
598 | if (task != conn->login_task) | |
599 | __kfifo_put(session->cmdpool.queue, (void*)&task, | |
600 | sizeof(void*)); | |
601 | return NULL; | |
f6d5180c MC |
602 | } |
603 | ||
604 | int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr, | |
605 | char *data, uint32_t data_size) | |
606 | { | |
607 | struct iscsi_conn *conn = cls_conn->dd_data; | |
608 | struct iscsi_session *session = conn->session; | |
609 | int err = 0; | |
610 | ||
611 | spin_lock_bh(&session->lock); | |
612 | if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size)) | |
613 | err = -EPERM; | |
614 | spin_unlock_bh(&session->lock); | |
f6d5180c MC |
615 | return err; |
616 | } | |
617 | EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu); | |
618 | ||
7996a778 MC |
619 | /** |
620 | * iscsi_cmd_rsp - SCSI Command Response processing | |
621 | * @conn: iscsi connection | |
622 | * @hdr: iscsi header | |
9c19a7d0 | 623 | * @task: scsi command task |
7996a778 MC |
624 | * @data: cmd data buffer |
625 | * @datalen: len of buffer | |
626 | * | |
627 | * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and | |
9c19a7d0 | 628 | * then completes the command and task. |
7996a778 | 629 | **/ |
77a23c21 | 630 | static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
9c19a7d0 | 631 | struct iscsi_task *task, char *data, |
77a23c21 | 632 | int datalen) |
7996a778 | 633 | { |
7996a778 MC |
634 | struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)hdr; |
635 | struct iscsi_session *session = conn->session; | |
9c19a7d0 | 636 | struct scsi_cmnd *sc = task->sc; |
7996a778 | 637 | |
77a23c21 | 638 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr); |
7996a778 MC |
639 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; |
640 | ||
641 | sc->result = (DID_OK << 16) | rhdr->cmd_status; | |
642 | ||
643 | if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) { | |
644 | sc->result = DID_ERROR << 16; | |
645 | goto out; | |
646 | } | |
647 | ||
648 | if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) { | |
9b80cb4b | 649 | uint16_t senselen; |
7996a778 MC |
650 | |
651 | if (datalen < 2) { | |
652 | invalid_datalen: | |
322d739d MC |
653 | iscsi_conn_printk(KERN_ERR, conn, |
654 | "Got CHECK_CONDITION but invalid data " | |
655 | "buffer size of %d\n", datalen); | |
7996a778 MC |
656 | sc->result = DID_BAD_TARGET << 16; |
657 | goto out; | |
658 | } | |
659 | ||
8f333991 | 660 | senselen = get_unaligned_be16(data); |
7996a778 MC |
661 | if (datalen < senselen) |
662 | goto invalid_datalen; | |
663 | ||
664 | memcpy(sc->sense_buffer, data + 2, | |
9b80cb4b | 665 | min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE)); |
1b2c7af8 MC |
666 | ISCSI_DBG_SESSION(session, "copied %d bytes of sense\n", |
667 | min_t(uint16_t, senselen, | |
668 | SCSI_SENSE_BUFFERSIZE)); | |
7996a778 MC |
669 | } |
670 | ||
c07d4444 BH |
671 | if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW | |
672 | ISCSI_FLAG_CMD_BIDI_OVERFLOW)) { | |
673 | int res_count = be32_to_cpu(rhdr->bi_residual_count); | |
674 | ||
675 | if (scsi_bidi_cmnd(sc) && res_count > 0 && | |
676 | (rhdr->flags & ISCSI_FLAG_CMD_BIDI_OVERFLOW || | |
677 | res_count <= scsi_in(sc)->length)) | |
678 | scsi_in(sc)->resid = res_count; | |
679 | else | |
680 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
681 | } | |
682 | ||
7207fea4 BH |
683 | if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW | |
684 | ISCSI_FLAG_CMD_OVERFLOW)) { | |
7996a778 MC |
685 | int res_count = be32_to_cpu(rhdr->residual_count); |
686 | ||
7207fea4 BH |
687 | if (res_count > 0 && |
688 | (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || | |
689 | res_count <= scsi_bufflen(sc))) | |
c07d4444 | 690 | /* write side for bidi or uni-io set_resid */ |
1c138991 | 691 | scsi_set_resid(sc, res_count); |
7996a778 MC |
692 | else |
693 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
c07d4444 | 694 | } |
7996a778 | 695 | out: |
1b2c7af8 MC |
696 | ISCSI_DBG_SESSION(session, "done [sc %p res %d itt 0x%x]\n", |
697 | sc, sc->result, task->itt); | |
7996a778 MC |
698 | conn->scsirsp_pdus_cnt++; |
699 | ||
9c19a7d0 | 700 | __iscsi_put_task(task); |
7996a778 MC |
701 | } |
702 | ||
1d9edf02 MC |
703 | /** |
704 | * iscsi_data_in_rsp - SCSI Data-In Response processing | |
705 | * @conn: iscsi connection | |
706 | * @hdr: iscsi pdu | |
707 | * @task: scsi command task | |
708 | **/ | |
709 | static void | |
710 | iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
711 | struct iscsi_task *task) | |
712 | { | |
713 | struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)hdr; | |
714 | struct scsi_cmnd *sc = task->sc; | |
715 | ||
716 | if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS)) | |
717 | return; | |
718 | ||
719 | sc->result = (DID_OK << 16) | rhdr->cmd_status; | |
720 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; | |
721 | if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW | | |
722 | ISCSI_FLAG_DATA_OVERFLOW)) { | |
723 | int res_count = be32_to_cpu(rhdr->residual_count); | |
724 | ||
725 | if (res_count > 0 && | |
726 | (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || | |
727 | res_count <= scsi_in(sc)->length)) | |
728 | scsi_in(sc)->resid = res_count; | |
729 | else | |
730 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
731 | } | |
732 | ||
733 | conn->scsirsp_pdus_cnt++; | |
734 | __iscsi_put_task(task); | |
735 | } | |
736 | ||
7ea8b828 MC |
737 | static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr) |
738 | { | |
739 | struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr; | |
740 | ||
741 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
742 | conn->tmfrsp_pdus_cnt++; | |
743 | ||
843c0a8a | 744 | if (conn->tmf_state != TMF_QUEUED) |
7ea8b828 MC |
745 | return; |
746 | ||
747 | if (tmf->response == ISCSI_TMF_RSP_COMPLETE) | |
843c0a8a | 748 | conn->tmf_state = TMF_SUCCESS; |
7ea8b828 | 749 | else if (tmf->response == ISCSI_TMF_RSP_NO_TASK) |
843c0a8a | 750 | conn->tmf_state = TMF_NOT_FOUND; |
7ea8b828 | 751 | else |
843c0a8a | 752 | conn->tmf_state = TMF_FAILED; |
7ea8b828 MC |
753 | wake_up(&conn->ehwait); |
754 | } | |
755 | ||
f6d5180c MC |
756 | static void iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr) |
757 | { | |
758 | struct iscsi_nopout hdr; | |
9c19a7d0 | 759 | struct iscsi_task *task; |
f6d5180c | 760 | |
9c19a7d0 | 761 | if (!rhdr && conn->ping_task) |
f6d5180c MC |
762 | return; |
763 | ||
764 | memset(&hdr, 0, sizeof(struct iscsi_nopout)); | |
765 | hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE; | |
766 | hdr.flags = ISCSI_FLAG_CMD_FINAL; | |
767 | ||
768 | if (rhdr) { | |
769 | memcpy(hdr.lun, rhdr->lun, 8); | |
770 | hdr.ttt = rhdr->ttt; | |
771 | hdr.itt = RESERVED_ITT; | |
772 | } else | |
773 | hdr.ttt = RESERVED_ITT; | |
774 | ||
9c19a7d0 MC |
775 | task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0); |
776 | if (!task) | |
322d739d | 777 | iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n"); |
d3acf022 MC |
778 | else if (!rhdr) { |
779 | /* only track our nops */ | |
780 | conn->ping_task = task; | |
781 | conn->last_ping = jiffies; | |
782 | } | |
f6d5180c MC |
783 | } |
784 | ||
62f38300 MC |
785 | static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
786 | char *data, int datalen) | |
787 | { | |
788 | struct iscsi_reject *reject = (struct iscsi_reject *)hdr; | |
789 | struct iscsi_hdr rejected_pdu; | |
62f38300 MC |
790 | |
791 | conn->exp_statsn = be32_to_cpu(reject->statsn) + 1; | |
792 | ||
793 | if (reject->reason == ISCSI_REASON_DATA_DIGEST_ERROR) { | |
794 | if (ntoh24(reject->dlength) > datalen) | |
795 | return ISCSI_ERR_PROTO; | |
796 | ||
797 | if (ntoh24(reject->dlength) >= sizeof(struct iscsi_hdr)) { | |
798 | memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr)); | |
322d739d | 799 | iscsi_conn_printk(KERN_ERR, conn, |
262ef636 MC |
800 | "pdu (op 0x%x) rejected " |
801 | "due to DataDigest error.\n", | |
322d739d | 802 | rejected_pdu.opcode); |
62f38300 MC |
803 | } |
804 | } | |
805 | return 0; | |
806 | } | |
807 | ||
913e5bf4 MC |
808 | /** |
809 | * iscsi_itt_to_task - look up task by itt | |
810 | * @conn: iscsi connection | |
811 | * @itt: itt | |
812 | * | |
813 | * This should be used for mgmt tasks like login and nops, or if | |
814 | * the LDD's itt space does not include the session age. | |
815 | * | |
816 | * The session lock must be held. | |
817 | */ | |
818 | static struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *conn, itt_t itt) | |
819 | { | |
820 | struct iscsi_session *session = conn->session; | |
262ef636 | 821 | int i; |
913e5bf4 MC |
822 | |
823 | if (itt == RESERVED_ITT) | |
824 | return NULL; | |
825 | ||
262ef636 MC |
826 | if (session->tt->parse_pdu_itt) |
827 | session->tt->parse_pdu_itt(conn, itt, &i, NULL); | |
828 | else | |
829 | i = get_itt(itt); | |
913e5bf4 MC |
830 | if (i >= session->cmds_max) |
831 | return NULL; | |
832 | ||
833 | return session->cmds[i]; | |
834 | } | |
835 | ||
7996a778 MC |
836 | /** |
837 | * __iscsi_complete_pdu - complete pdu | |
838 | * @conn: iscsi conn | |
839 | * @hdr: iscsi header | |
840 | * @data: data buffer | |
841 | * @datalen: len of data buffer | |
842 | * | |
843 | * Completes pdu processing by freeing any resources allocated at | |
844 | * queuecommand or send generic. session lock must be held and verify | |
845 | * itt must have been called. | |
846 | */ | |
913e5bf4 MC |
847 | int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
848 | char *data, int datalen) | |
7996a778 MC |
849 | { |
850 | struct iscsi_session *session = conn->session; | |
851 | int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0; | |
9c19a7d0 | 852 | struct iscsi_task *task; |
7996a778 MC |
853 | uint32_t itt; |
854 | ||
f6d5180c | 855 | conn->last_recv = jiffies; |
0af967f5 MC |
856 | rc = iscsi_verify_itt(conn, hdr->itt); |
857 | if (rc) | |
858 | return rc; | |
859 | ||
b4377356 AV |
860 | if (hdr->itt != RESERVED_ITT) |
861 | itt = get_itt(hdr->itt); | |
7996a778 | 862 | else |
b4377356 | 863 | itt = ~0U; |
7996a778 | 864 | |
1b2c7af8 MC |
865 | ISCSI_DBG_SESSION(session, "[op 0x%x cid %d itt 0x%x len %d]\n", |
866 | opcode, conn->id, itt, datalen); | |
7996a778 | 867 | |
3e5c28ad | 868 | if (itt == ~0U) { |
77a23c21 | 869 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); |
62f38300 | 870 | |
7996a778 MC |
871 | switch(opcode) { |
872 | case ISCSI_OP_NOOP_IN: | |
40527afe | 873 | if (datalen) { |
7996a778 | 874 | rc = ISCSI_ERR_PROTO; |
40527afe MC |
875 | break; |
876 | } | |
877 | ||
b4377356 | 878 | if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG)) |
40527afe MC |
879 | break; |
880 | ||
f6d5180c | 881 | iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr); |
7996a778 MC |
882 | break; |
883 | case ISCSI_OP_REJECT: | |
62f38300 MC |
884 | rc = iscsi_handle_reject(conn, hdr, data, datalen); |
885 | break; | |
7996a778 | 886 | case ISCSI_OP_ASYNC_EVENT: |
8d2860b3 | 887 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; |
5831c737 MC |
888 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) |
889 | rc = ISCSI_ERR_CONN_FAILED; | |
7996a778 MC |
890 | break; |
891 | default: | |
892 | rc = ISCSI_ERR_BAD_OPCODE; | |
893 | break; | |
894 | } | |
3e5c28ad MC |
895 | goto out; |
896 | } | |
897 | ||
3e5c28ad MC |
898 | switch(opcode) { |
899 | case ISCSI_OP_SCSI_CMD_RSP: | |
913e5bf4 MC |
900 | case ISCSI_OP_SCSI_DATA_IN: |
901 | task = iscsi_itt_to_ctask(conn, hdr->itt); | |
902 | if (!task) | |
903 | return ISCSI_ERR_BAD_ITT; | |
904 | break; | |
905 | case ISCSI_OP_R2T: | |
906 | /* | |
907 | * LLD handles R2Ts if they need to. | |
908 | */ | |
909 | return 0; | |
910 | case ISCSI_OP_LOGOUT_RSP: | |
911 | case ISCSI_OP_LOGIN_RSP: | |
912 | case ISCSI_OP_TEXT_RSP: | |
913 | case ISCSI_OP_SCSI_TMFUNC_RSP: | |
914 | case ISCSI_OP_NOOP_IN: | |
915 | task = iscsi_itt_to_task(conn, hdr->itt); | |
916 | if (!task) | |
917 | return ISCSI_ERR_BAD_ITT; | |
918 | break; | |
919 | default: | |
920 | return ISCSI_ERR_BAD_OPCODE; | |
921 | } | |
922 | ||
923 | switch(opcode) { | |
924 | case ISCSI_OP_SCSI_CMD_RSP: | |
9c19a7d0 | 925 | iscsi_scsi_cmd_rsp(conn, hdr, task, data, datalen); |
3e5c28ad MC |
926 | break; |
927 | case ISCSI_OP_SCSI_DATA_IN: | |
1d9edf02 | 928 | iscsi_data_in_rsp(conn, hdr, task); |
3e5c28ad | 929 | break; |
3e5c28ad MC |
930 | case ISCSI_OP_LOGOUT_RSP: |
931 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
932 | if (datalen) { | |
933 | rc = ISCSI_ERR_PROTO; | |
934 | break; | |
935 | } | |
936 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
937 | goto recv_pdu; | |
938 | case ISCSI_OP_LOGIN_RSP: | |
939 | case ISCSI_OP_TEXT_RSP: | |
940 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
941 | /* | |
942 | * login related PDU's exp_statsn is handled in | |
943 | * userspace | |
944 | */ | |
945 | goto recv_pdu; | |
946 | case ISCSI_OP_SCSI_TMFUNC_RSP: | |
947 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
948 | if (datalen) { | |
949 | rc = ISCSI_ERR_PROTO; | |
950 | break; | |
951 | } | |
952 | ||
953 | iscsi_tmf_rsp(conn, hdr); | |
9c19a7d0 | 954 | __iscsi_put_task(task); |
3e5c28ad MC |
955 | break; |
956 | case ISCSI_OP_NOOP_IN: | |
957 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
958 | if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) { | |
959 | rc = ISCSI_ERR_PROTO; | |
960 | break; | |
961 | } | |
962 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
963 | ||
9c19a7d0 | 964 | if (conn->ping_task != task) |
3e5c28ad MC |
965 | /* |
966 | * If this is not in response to one of our | |
967 | * nops then it must be from userspace. | |
968 | */ | |
969 | goto recv_pdu; | |
9c19a7d0 MC |
970 | |
971 | mod_timer(&conn->transport_timer, jiffies + conn->recv_timeout); | |
972 | __iscsi_put_task(task); | |
3e5c28ad MC |
973 | break; |
974 | default: | |
975 | rc = ISCSI_ERR_BAD_OPCODE; | |
976 | break; | |
977 | } | |
7996a778 | 978 | |
3e5c28ad MC |
979 | out: |
980 | return rc; | |
981 | recv_pdu: | |
982 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) | |
983 | rc = ISCSI_ERR_CONN_FAILED; | |
9c19a7d0 | 984 | __iscsi_put_task(task); |
7996a778 MC |
985 | return rc; |
986 | } | |
913e5bf4 | 987 | EXPORT_SYMBOL_GPL(__iscsi_complete_pdu); |
7996a778 MC |
988 | |
989 | int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
990 | char *data, int datalen) | |
991 | { | |
992 | int rc; | |
993 | ||
994 | spin_lock(&conn->session->lock); | |
995 | rc = __iscsi_complete_pdu(conn, hdr, data, datalen); | |
996 | spin_unlock(&conn->session->lock); | |
997 | return rc; | |
998 | } | |
999 | EXPORT_SYMBOL_GPL(iscsi_complete_pdu); | |
1000 | ||
0af967f5 | 1001 | int iscsi_verify_itt(struct iscsi_conn *conn, itt_t itt) |
7996a778 MC |
1002 | { |
1003 | struct iscsi_session *session = conn->session; | |
262ef636 | 1004 | int age = 0, i = 0; |
7996a778 | 1005 | |
0af967f5 MC |
1006 | if (itt == RESERVED_ITT) |
1007 | return 0; | |
7996a778 | 1008 | |
262ef636 MC |
1009 | if (session->tt->parse_pdu_itt) |
1010 | session->tt->parse_pdu_itt(conn, itt, &i, &age); | |
1011 | else { | |
1012 | i = get_itt(itt); | |
1013 | age = ((__force u32)itt >> ISCSI_AGE_SHIFT) & ISCSI_AGE_MASK; | |
1014 | } | |
1015 | ||
1016 | if (age != session->age) { | |
0af967f5 MC |
1017 | iscsi_conn_printk(KERN_ERR, conn, |
1018 | "received itt %x expected session age (%x)\n", | |
913e5bf4 | 1019 | (__force u32)itt, session->age); |
0af967f5 MC |
1020 | return ISCSI_ERR_BAD_ITT; |
1021 | } | |
7996a778 | 1022 | |
3e5c28ad MC |
1023 | if (i >= session->cmds_max) { |
1024 | iscsi_conn_printk(KERN_ERR, conn, | |
1025 | "received invalid itt index %u (max cmds " | |
1026 | "%u.\n", i, session->cmds_max); | |
1027 | return ISCSI_ERR_BAD_ITT; | |
7996a778 | 1028 | } |
7996a778 MC |
1029 | return 0; |
1030 | } | |
1031 | EXPORT_SYMBOL_GPL(iscsi_verify_itt); | |
1032 | ||
913e5bf4 MC |
1033 | /** |
1034 | * iscsi_itt_to_ctask - look up ctask by itt | |
1035 | * @conn: iscsi connection | |
1036 | * @itt: itt | |
1037 | * | |
1038 | * This should be used for cmd tasks. | |
1039 | * | |
1040 | * The session lock must be held. | |
1041 | */ | |
1042 | struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *conn, itt_t itt) | |
0af967f5 | 1043 | { |
9c19a7d0 | 1044 | struct iscsi_task *task; |
0af967f5 MC |
1045 | |
1046 | if (iscsi_verify_itt(conn, itt)) | |
1047 | return NULL; | |
1048 | ||
913e5bf4 MC |
1049 | task = iscsi_itt_to_task(conn, itt); |
1050 | if (!task || !task->sc) | |
0af967f5 MC |
1051 | return NULL; |
1052 | ||
913e5bf4 MC |
1053 | if (task->sc->SCp.phase != conn->session->age) { |
1054 | iscsi_session_printk(KERN_ERR, conn->session, | |
1055 | "task's session age %d, expected %d\n", | |
1056 | task->sc->SCp.phase, conn->session->age); | |
0af967f5 | 1057 | return NULL; |
913e5bf4 | 1058 | } |
0af967f5 | 1059 | |
9c19a7d0 | 1060 | return task; |
0af967f5 MC |
1061 | } |
1062 | EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask); | |
1063 | ||
e5bd7b54 MC |
1064 | void iscsi_session_failure(struct iscsi_cls_session *cls_session, |
1065 | enum iscsi_err err) | |
1066 | { | |
1067 | struct iscsi_session *session = cls_session->dd_data; | |
1068 | struct iscsi_conn *conn; | |
1069 | struct device *dev; | |
1070 | unsigned long flags; | |
1071 | ||
1072 | spin_lock_irqsave(&session->lock, flags); | |
1073 | conn = session->leadconn; | |
1074 | if (session->state == ISCSI_STATE_TERMINATE || !conn) { | |
1075 | spin_unlock_irqrestore(&session->lock, flags); | |
1076 | return; | |
1077 | } | |
1078 | ||
1079 | dev = get_device(&conn->cls_conn->dev); | |
1080 | spin_unlock_irqrestore(&session->lock, flags); | |
1081 | if (!dev) | |
1082 | return; | |
1083 | /* | |
1084 | * if the host is being removed bypass the connection | |
1085 | * recovery initialization because we are going to kill | |
1086 | * the session. | |
1087 | */ | |
1088 | if (err == ISCSI_ERR_INVALID_HOST) | |
1089 | iscsi_conn_error_event(conn->cls_conn, err); | |
1090 | else | |
1091 | iscsi_conn_failure(conn, err); | |
1092 | put_device(dev); | |
1093 | } | |
1094 | EXPORT_SYMBOL_GPL(iscsi_session_failure); | |
1095 | ||
7996a778 MC |
1096 | void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err) |
1097 | { | |
1098 | struct iscsi_session *session = conn->session; | |
1099 | unsigned long flags; | |
1100 | ||
1101 | spin_lock_irqsave(&session->lock, flags); | |
656cffc9 MC |
1102 | if (session->state == ISCSI_STATE_FAILED) { |
1103 | spin_unlock_irqrestore(&session->lock, flags); | |
1104 | return; | |
1105 | } | |
1106 | ||
67a61114 | 1107 | if (conn->stop_stage == 0) |
7996a778 MC |
1108 | session->state = ISCSI_STATE_FAILED; |
1109 | spin_unlock_irqrestore(&session->lock, flags); | |
e5bd7b54 | 1110 | |
7996a778 MC |
1111 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); |
1112 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
e5bd7b54 | 1113 | iscsi_conn_error_event(conn->cls_conn, err); |
7996a778 MC |
1114 | } |
1115 | EXPORT_SYMBOL_GPL(iscsi_conn_failure); | |
1116 | ||
77a23c21 MC |
1117 | static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn) |
1118 | { | |
1119 | struct iscsi_session *session = conn->session; | |
1120 | ||
1121 | /* | |
1122 | * Check for iSCSI window and take care of CmdSN wrap-around | |
1123 | */ | |
e0726407 | 1124 | if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) { |
1b2c7af8 MC |
1125 | ISCSI_DBG_SESSION(session, "iSCSI CmdSN closed. ExpCmdSn " |
1126 | "%u MaxCmdSN %u CmdSN %u/%u\n", | |
1127 | session->exp_cmdsn, session->max_cmdsn, | |
1128 | session->cmdsn, session->queued_cmdsn); | |
77a23c21 MC |
1129 | return -ENOSPC; |
1130 | } | |
1131 | return 0; | |
1132 | } | |
1133 | ||
9c19a7d0 | 1134 | static int iscsi_xmit_task(struct iscsi_conn *conn) |
77a23c21 | 1135 | { |
9c19a7d0 | 1136 | struct iscsi_task *task = conn->task; |
843c0a8a | 1137 | int rc; |
77a23c21 | 1138 | |
9c19a7d0 | 1139 | __iscsi_get_task(task); |
77a23c21 | 1140 | spin_unlock_bh(&conn->session->lock); |
9c19a7d0 | 1141 | rc = conn->session->tt->xmit_task(task); |
77a23c21 | 1142 | spin_lock_bh(&conn->session->lock); |
9c19a7d0 | 1143 | __iscsi_put_task(task); |
77a23c21 | 1144 | if (!rc) |
9c19a7d0 MC |
1145 | /* done with this task */ |
1146 | conn->task = NULL; | |
77a23c21 MC |
1147 | return rc; |
1148 | } | |
1149 | ||
843c0a8a | 1150 | /** |
9c19a7d0 MC |
1151 | * iscsi_requeue_task - requeue task to run from session workqueue |
1152 | * @task: task to requeue | |
843c0a8a | 1153 | * |
9c19a7d0 | 1154 | * LLDs that need to run a task from the session workqueue should call |
052d0144 MC |
1155 | * this. The session lock must be held. This should only be called |
1156 | * by software drivers. | |
843c0a8a | 1157 | */ |
9c19a7d0 | 1158 | void iscsi_requeue_task(struct iscsi_task *task) |
843c0a8a | 1159 | { |
9c19a7d0 | 1160 | struct iscsi_conn *conn = task->conn; |
843c0a8a | 1161 | |
9c19a7d0 | 1162 | list_move_tail(&task->running, &conn->requeue); |
843c0a8a MC |
1163 | scsi_queue_work(conn->session->host, &conn->xmitwork); |
1164 | } | |
9c19a7d0 | 1165 | EXPORT_SYMBOL_GPL(iscsi_requeue_task); |
843c0a8a | 1166 | |
7996a778 MC |
1167 | /** |
1168 | * iscsi_data_xmit - xmit any command into the scheduled connection | |
1169 | * @conn: iscsi connection | |
1170 | * | |
1171 | * Notes: | |
1172 | * The function can return -EAGAIN in which case the caller must | |
1173 | * re-schedule it again later or recover. '0' return code means | |
1174 | * successful xmit. | |
1175 | **/ | |
1176 | static int iscsi_data_xmit(struct iscsi_conn *conn) | |
1177 | { | |
3219e529 | 1178 | int rc = 0; |
7996a778 | 1179 | |
77a23c21 | 1180 | spin_lock_bh(&conn->session->lock); |
7996a778 | 1181 | if (unlikely(conn->suspend_tx)) { |
1b2c7af8 | 1182 | ISCSI_DBG_SESSION(conn->session, "Tx suspended!\n"); |
77a23c21 | 1183 | spin_unlock_bh(&conn->session->lock); |
3219e529 | 1184 | return -ENODATA; |
7996a778 | 1185 | } |
7996a778 | 1186 | |
9c19a7d0 MC |
1187 | if (conn->task) { |
1188 | rc = iscsi_xmit_task(conn); | |
3219e529 | 1189 | if (rc) |
7996a778 | 1190 | goto again; |
7996a778 MC |
1191 | } |
1192 | ||
77a23c21 MC |
1193 | /* |
1194 | * process mgmt pdus like nops before commands since we should | |
1195 | * only have one nop-out as a ping from us and targets should not | |
1196 | * overflow us with nop-ins | |
1197 | */ | |
1198 | check_mgmt: | |
843c0a8a | 1199 | while (!list_empty(&conn->mgmtqueue)) { |
9c19a7d0 MC |
1200 | conn->task = list_entry(conn->mgmtqueue.next, |
1201 | struct iscsi_task, running); | |
1202 | if (iscsi_prep_mgmt_task(conn, conn->task)) { | |
1203 | __iscsi_put_task(conn->task); | |
1204 | conn->task = NULL; | |
b3a7ea8d MC |
1205 | continue; |
1206 | } | |
9c19a7d0 | 1207 | rc = iscsi_xmit_task(conn); |
77a23c21 MC |
1208 | if (rc) |
1209 | goto again; | |
7996a778 MC |
1210 | } |
1211 | ||
843c0a8a | 1212 | /* process pending command queue */ |
b6c395ed | 1213 | while (!list_empty(&conn->xmitqueue)) { |
843c0a8a MC |
1214 | if (conn->tmf_state == TMF_QUEUED) |
1215 | break; | |
1216 | ||
9c19a7d0 MC |
1217 | conn->task = list_entry(conn->xmitqueue.next, |
1218 | struct iscsi_task, running); | |
b3a7ea8d | 1219 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) { |
9c19a7d0 | 1220 | fail_command(conn, conn->task, DID_IMM_RETRY << 16); |
b3a7ea8d MC |
1221 | continue; |
1222 | } | |
577577da MC |
1223 | rc = iscsi_prep_scsi_cmd_pdu(conn->task); |
1224 | if (rc) { | |
1225 | if (rc == -ENOMEM) { | |
1226 | conn->task = NULL; | |
1227 | goto again; | |
1228 | } else | |
1229 | fail_command(conn, conn->task, DID_ABORT << 16); | |
004d6530 BH |
1230 | continue; |
1231 | } | |
9c19a7d0 | 1232 | rc = iscsi_xmit_task(conn); |
77a23c21 | 1233 | if (rc) |
60ecebf5 | 1234 | goto again; |
77a23c21 | 1235 | /* |
9c19a7d0 | 1236 | * we could continuously get new task requests so |
77a23c21 MC |
1237 | * we need to check the mgmt queue for nops that need to |
1238 | * be sent to aviod starvation | |
1239 | */ | |
843c0a8a MC |
1240 | if (!list_empty(&conn->mgmtqueue)) |
1241 | goto check_mgmt; | |
1242 | } | |
1243 | ||
1244 | while (!list_empty(&conn->requeue)) { | |
1245 | if (conn->session->fast_abort && conn->tmf_state != TMF_INITIAL) | |
1246 | break; | |
1247 | ||
b3a7ea8d MC |
1248 | /* |
1249 | * we always do fastlogout - conn stop code will clean up. | |
1250 | */ | |
1251 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) | |
1252 | break; | |
1253 | ||
9c19a7d0 MC |
1254 | conn->task = list_entry(conn->requeue.next, |
1255 | struct iscsi_task, running); | |
1256 | conn->task->state = ISCSI_TASK_RUNNING; | |
843c0a8a | 1257 | list_move_tail(conn->requeue.next, &conn->run_list); |
9c19a7d0 | 1258 | rc = iscsi_xmit_task(conn); |
843c0a8a MC |
1259 | if (rc) |
1260 | goto again; | |
1261 | if (!list_empty(&conn->mgmtqueue)) | |
77a23c21 | 1262 | goto check_mgmt; |
7996a778 | 1263 | } |
b6c395ed | 1264 | spin_unlock_bh(&conn->session->lock); |
3219e529 | 1265 | return -ENODATA; |
7996a778 MC |
1266 | |
1267 | again: | |
1268 | if (unlikely(conn->suspend_tx)) | |
77a23c21 MC |
1269 | rc = -ENODATA; |
1270 | spin_unlock_bh(&conn->session->lock); | |
3219e529 | 1271 | return rc; |
7996a778 MC |
1272 | } |
1273 | ||
c4028958 | 1274 | static void iscsi_xmitworker(struct work_struct *work) |
7996a778 | 1275 | { |
c4028958 DH |
1276 | struct iscsi_conn *conn = |
1277 | container_of(work, struct iscsi_conn, xmitwork); | |
3219e529 | 1278 | int rc; |
7996a778 MC |
1279 | /* |
1280 | * serialize Xmit worker on a per-connection basis. | |
1281 | */ | |
3219e529 MC |
1282 | do { |
1283 | rc = iscsi_data_xmit(conn); | |
1284 | } while (rc >= 0 || rc == -EAGAIN); | |
7996a778 MC |
1285 | } |
1286 | ||
577577da MC |
1287 | static inline struct iscsi_task *iscsi_alloc_task(struct iscsi_conn *conn, |
1288 | struct scsi_cmnd *sc) | |
1289 | { | |
1290 | struct iscsi_task *task; | |
1291 | ||
1292 | if (!__kfifo_get(conn->session->cmdpool.queue, | |
1293 | (void *) &task, sizeof(void *))) | |
1294 | return NULL; | |
1295 | ||
1296 | sc->SCp.phase = conn->session->age; | |
1297 | sc->SCp.ptr = (char *) task; | |
1298 | ||
1299 | atomic_set(&task->refcount, 1); | |
1300 | task->state = ISCSI_TASK_PENDING; | |
1301 | task->conn = conn; | |
1302 | task->sc = sc; | |
1303 | INIT_LIST_HEAD(&task->running); | |
1304 | return task; | |
1305 | } | |
1306 | ||
7996a778 MC |
1307 | enum { |
1308 | FAILURE_BAD_HOST = 1, | |
1309 | FAILURE_SESSION_FAILED, | |
1310 | FAILURE_SESSION_FREED, | |
1311 | FAILURE_WINDOW_CLOSED, | |
60ecebf5 | 1312 | FAILURE_OOM, |
7996a778 | 1313 | FAILURE_SESSION_TERMINATE, |
656cffc9 | 1314 | FAILURE_SESSION_IN_RECOVERY, |
7996a778 | 1315 | FAILURE_SESSION_RECOVERY_TIMEOUT, |
b3a7ea8d | 1316 | FAILURE_SESSION_LOGGING_OUT, |
6eabafbe | 1317 | FAILURE_SESSION_NOT_READY, |
7996a778 MC |
1318 | }; |
1319 | ||
1320 | int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *)) | |
1321 | { | |
75613521 | 1322 | struct iscsi_cls_session *cls_session; |
7996a778 MC |
1323 | struct Scsi_Host *host; |
1324 | int reason = 0; | |
1325 | struct iscsi_session *session; | |
1326 | struct iscsi_conn *conn; | |
9c19a7d0 | 1327 | struct iscsi_task *task = NULL; |
7996a778 MC |
1328 | |
1329 | sc->scsi_done = done; | |
1330 | sc->result = 0; | |
f47f2cf5 | 1331 | sc->SCp.ptr = NULL; |
7996a778 MC |
1332 | |
1333 | host = sc->device->host; | |
1040c99d | 1334 | spin_unlock(host->host_lock); |
7996a778 | 1335 | |
75613521 MC |
1336 | cls_session = starget_to_session(scsi_target(sc->device)); |
1337 | session = cls_session->dd_data; | |
7996a778 MC |
1338 | spin_lock(&session->lock); |
1339 | ||
75613521 | 1340 | reason = iscsi_session_chkready(cls_session); |
6eabafbe MC |
1341 | if (reason) { |
1342 | sc->result = reason; | |
1343 | goto fault; | |
1344 | } | |
1345 | ||
656cffc9 MC |
1346 | /* |
1347 | * ISCSI_STATE_FAILED is a temp. state. The recovery | |
1348 | * code will decide what is best to do with command queued | |
1349 | * during this time | |
1350 | */ | |
1351 | if (session->state != ISCSI_STATE_LOGGED_IN && | |
1352 | session->state != ISCSI_STATE_FAILED) { | |
1353 | /* | |
1354 | * to handle the race between when we set the recovery state | |
1355 | * and block the session we requeue here (commands could | |
1356 | * be entering our queuecommand while a block is starting | |
1357 | * up because the block code is not locked) | |
1358 | */ | |
9000bcd6 MC |
1359 | switch (session->state) { |
1360 | case ISCSI_STATE_IN_RECOVERY: | |
656cffc9 | 1361 | reason = FAILURE_SESSION_IN_RECOVERY; |
d6d13ee1 | 1362 | goto reject; |
9000bcd6 MC |
1363 | case ISCSI_STATE_LOGGING_OUT: |
1364 | reason = FAILURE_SESSION_LOGGING_OUT; | |
d6d13ee1 | 1365 | goto reject; |
b3a7ea8d | 1366 | case ISCSI_STATE_RECOVERY_FAILED: |
656cffc9 | 1367 | reason = FAILURE_SESSION_RECOVERY_TIMEOUT; |
56d7fcfa | 1368 | sc->result = DID_TRANSPORT_FAILFAST << 16; |
b3a7ea8d MC |
1369 | break; |
1370 | case ISCSI_STATE_TERMINATE: | |
656cffc9 | 1371 | reason = FAILURE_SESSION_TERMINATE; |
6eabafbe | 1372 | sc->result = DID_NO_CONNECT << 16; |
b3a7ea8d | 1373 | break; |
b3a7ea8d | 1374 | default: |
656cffc9 | 1375 | reason = FAILURE_SESSION_FREED; |
6eabafbe | 1376 | sc->result = DID_NO_CONNECT << 16; |
b3a7ea8d | 1377 | } |
7996a778 MC |
1378 | goto fault; |
1379 | } | |
1380 | ||
7996a778 | 1381 | conn = session->leadconn; |
98644047 MC |
1382 | if (!conn) { |
1383 | reason = FAILURE_SESSION_FREED; | |
6eabafbe | 1384 | sc->result = DID_NO_CONNECT << 16; |
98644047 MC |
1385 | goto fault; |
1386 | } | |
7996a778 | 1387 | |
77a23c21 MC |
1388 | if (iscsi_check_cmdsn_window_closed(conn)) { |
1389 | reason = FAILURE_WINDOW_CLOSED; | |
1390 | goto reject; | |
1391 | } | |
1392 | ||
577577da MC |
1393 | task = iscsi_alloc_task(conn, sc); |
1394 | if (!task) { | |
60ecebf5 MC |
1395 | reason = FAILURE_OOM; |
1396 | goto reject; | |
1397 | } | |
9c19a7d0 | 1398 | list_add_tail(&task->running, &conn->xmitqueue); |
7996a778 | 1399 | |
052d0144 | 1400 | if (session->tt->caps & CAP_DATA_PATH_OFFLOAD) { |
577577da MC |
1401 | reason = iscsi_prep_scsi_cmd_pdu(task); |
1402 | if (reason) { | |
1403 | if (reason == -ENOMEM) { | |
1404 | reason = FAILURE_OOM; | |
1405 | goto prepd_reject; | |
1406 | } else { | |
1407 | sc->result = DID_ABORT << 16; | |
1408 | goto prepd_fault; | |
1409 | } | |
052d0144 | 1410 | } |
9c19a7d0 | 1411 | if (session->tt->xmit_task(task)) { |
052d0144 | 1412 | reason = FAILURE_SESSION_NOT_READY; |
577577da | 1413 | goto prepd_reject; |
052d0144 MC |
1414 | } |
1415 | } else | |
1416 | scsi_queue_work(session->host, &conn->xmitwork); | |
1417 | ||
1418 | session->queued_cmdsn++; | |
1419 | spin_unlock(&session->lock); | |
1040c99d | 1420 | spin_lock(host->host_lock); |
7996a778 MC |
1421 | return 0; |
1422 | ||
577577da MC |
1423 | prepd_reject: |
1424 | sc->scsi_done = NULL; | |
1425 | iscsi_complete_command(task); | |
7996a778 MC |
1426 | reject: |
1427 | spin_unlock(&session->lock); | |
1b2c7af8 MC |
1428 | ISCSI_DBG_SESSION(session, "cmd 0x%x rejected (%d)\n", |
1429 | sc->cmnd[0], reason); | |
1040c99d | 1430 | spin_lock(host->host_lock); |
d6d13ee1 | 1431 | return SCSI_MLQUEUE_TARGET_BUSY; |
7996a778 | 1432 | |
577577da MC |
1433 | prepd_fault: |
1434 | sc->scsi_done = NULL; | |
1435 | iscsi_complete_command(task); | |
7996a778 MC |
1436 | fault: |
1437 | spin_unlock(&session->lock); | |
1b2c7af8 MC |
1438 | ISCSI_DBG_SESSION(session, "iscsi: cmd 0x%x is not queued (%d)\n", |
1439 | sc->cmnd[0], reason); | |
c07d4444 BH |
1440 | if (!scsi_bidi_cmnd(sc)) |
1441 | scsi_set_resid(sc, scsi_bufflen(sc)); | |
1442 | else { | |
1443 | scsi_out(sc)->resid = scsi_out(sc)->length; | |
1444 | scsi_in(sc)->resid = scsi_in(sc)->length; | |
1445 | } | |
052d0144 | 1446 | done(sc); |
1040c99d | 1447 | spin_lock(host->host_lock); |
7996a778 MC |
1448 | return 0; |
1449 | } | |
1450 | EXPORT_SYMBOL_GPL(iscsi_queuecommand); | |
1451 | ||
1452 | int iscsi_change_queue_depth(struct scsi_device *sdev, int depth) | |
1453 | { | |
1454 | if (depth > ISCSI_MAX_CMD_PER_LUN) | |
1455 | depth = ISCSI_MAX_CMD_PER_LUN; | |
1456 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); | |
1457 | return sdev->queue_depth; | |
1458 | } | |
1459 | EXPORT_SYMBOL_GPL(iscsi_change_queue_depth); | |
1460 | ||
7996a778 MC |
1461 | void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session) |
1462 | { | |
75613521 | 1463 | struct iscsi_session *session = cls_session->dd_data; |
7996a778 MC |
1464 | |
1465 | spin_lock_bh(&session->lock); | |
1466 | if (session->state != ISCSI_STATE_LOGGED_IN) { | |
656cffc9 | 1467 | session->state = ISCSI_STATE_RECOVERY_FAILED; |
843c0a8a MC |
1468 | if (session->leadconn) |
1469 | wake_up(&session->leadconn->ehwait); | |
7996a778 MC |
1470 | } |
1471 | spin_unlock_bh(&session->lock); | |
1472 | } | |
1473 | EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout); | |
1474 | ||
8e124525 | 1475 | int iscsi_eh_target_reset(struct scsi_cmnd *sc) |
7996a778 | 1476 | { |
75613521 MC |
1477 | struct iscsi_cls_session *cls_session; |
1478 | struct iscsi_session *session; | |
1479 | struct iscsi_conn *conn; | |
1480 | ||
1481 | cls_session = starget_to_session(scsi_target(sc->device)); | |
1482 | session = cls_session->dd_data; | |
1483 | conn = session->leadconn; | |
7996a778 | 1484 | |
bc436b27 | 1485 | mutex_lock(&session->eh_mutex); |
7996a778 MC |
1486 | spin_lock_bh(&session->lock); |
1487 | if (session->state == ISCSI_STATE_TERMINATE) { | |
1488 | failed: | |
1b2c7af8 MC |
1489 | iscsi_session_printk(KERN_INFO, session, |
1490 | "failing target reset: Could not log " | |
1491 | "back into target [age %d]\n", | |
1492 | session->age); | |
7996a778 | 1493 | spin_unlock_bh(&session->lock); |
bc436b27 | 1494 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1495 | return FAILED; |
1496 | } | |
1497 | ||
7996a778 | 1498 | spin_unlock_bh(&session->lock); |
bc436b27 | 1499 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1500 | /* |
1501 | * we drop the lock here but the leadconn cannot be destoyed while | |
1502 | * we are in the scsi eh | |
1503 | */ | |
843c0a8a | 1504 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
7996a778 | 1505 | |
1b2c7af8 | 1506 | ISCSI_DBG_SESSION(session, "wait for relogin\n"); |
7996a778 MC |
1507 | wait_event_interruptible(conn->ehwait, |
1508 | session->state == ISCSI_STATE_TERMINATE || | |
1509 | session->state == ISCSI_STATE_LOGGED_IN || | |
656cffc9 | 1510 | session->state == ISCSI_STATE_RECOVERY_FAILED); |
7996a778 MC |
1511 | if (signal_pending(current)) |
1512 | flush_signals(current); | |
1513 | ||
bc436b27 | 1514 | mutex_lock(&session->eh_mutex); |
7996a778 MC |
1515 | spin_lock_bh(&session->lock); |
1516 | if (session->state == ISCSI_STATE_LOGGED_IN) | |
322d739d | 1517 | iscsi_session_printk(KERN_INFO, session, |
8e124525 | 1518 | "target reset succeeded\n"); |
7996a778 MC |
1519 | else |
1520 | goto failed; | |
1521 | spin_unlock_bh(&session->lock); | |
bc436b27 | 1522 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1523 | return SUCCESS; |
1524 | } | |
8e124525 | 1525 | EXPORT_SYMBOL_GPL(iscsi_eh_target_reset); |
7996a778 | 1526 | |
843c0a8a | 1527 | static void iscsi_tmf_timedout(unsigned long data) |
7996a778 | 1528 | { |
843c0a8a | 1529 | struct iscsi_conn *conn = (struct iscsi_conn *)data; |
7996a778 MC |
1530 | struct iscsi_session *session = conn->session; |
1531 | ||
1532 | spin_lock(&session->lock); | |
843c0a8a MC |
1533 | if (conn->tmf_state == TMF_QUEUED) { |
1534 | conn->tmf_state = TMF_TIMEDOUT; | |
1b2c7af8 | 1535 | ISCSI_DBG_SESSION(session, "tmf timedout\n"); |
7996a778 MC |
1536 | /* unblock eh_abort() */ |
1537 | wake_up(&conn->ehwait); | |
1538 | } | |
1539 | spin_unlock(&session->lock); | |
1540 | } | |
1541 | ||
9c19a7d0 | 1542 | static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn, |
f6d5180c MC |
1543 | struct iscsi_tm *hdr, int age, |
1544 | int timeout) | |
7996a778 | 1545 | { |
7996a778 | 1546 | struct iscsi_session *session = conn->session; |
9c19a7d0 | 1547 | struct iscsi_task *task; |
7996a778 | 1548 | |
9c19a7d0 | 1549 | task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr, |
843c0a8a | 1550 | NULL, 0); |
9c19a7d0 | 1551 | if (!task) { |
6724add1 | 1552 | spin_unlock_bh(&session->lock); |
7996a778 | 1553 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
843c0a8a | 1554 | spin_lock_bh(&session->lock); |
1b2c7af8 | 1555 | ISCSI_DBG_SESSION(session, "tmf exec failure\n"); |
77a23c21 | 1556 | return -EPERM; |
7996a778 | 1557 | } |
843c0a8a | 1558 | conn->tmfcmd_pdus_cnt++; |
f6d5180c | 1559 | conn->tmf_timer.expires = timeout * HZ + jiffies; |
843c0a8a MC |
1560 | conn->tmf_timer.function = iscsi_tmf_timedout; |
1561 | conn->tmf_timer.data = (unsigned long)conn; | |
1562 | add_timer(&conn->tmf_timer); | |
1b2c7af8 | 1563 | ISCSI_DBG_SESSION(session, "tmf set timeout\n"); |
7996a778 | 1564 | |
7996a778 | 1565 | spin_unlock_bh(&session->lock); |
6724add1 | 1566 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1567 | |
1568 | /* | |
1569 | * block eh thread until: | |
1570 | * | |
843c0a8a MC |
1571 | * 1) tmf response |
1572 | * 2) tmf timeout | |
7996a778 MC |
1573 | * 3) session is terminated or restarted or userspace has |
1574 | * given up on recovery | |
1575 | */ | |
843c0a8a | 1576 | wait_event_interruptible(conn->ehwait, age != session->age || |
7996a778 | 1577 | session->state != ISCSI_STATE_LOGGED_IN || |
843c0a8a | 1578 | conn->tmf_state != TMF_QUEUED); |
7996a778 MC |
1579 | if (signal_pending(current)) |
1580 | flush_signals(current); | |
843c0a8a MC |
1581 | del_timer_sync(&conn->tmf_timer); |
1582 | ||
6724add1 | 1583 | mutex_lock(&session->eh_mutex); |
77a23c21 | 1584 | spin_lock_bh(&session->lock); |
9c19a7d0 | 1585 | /* if the session drops it will clean up the task */ |
843c0a8a MC |
1586 | if (age != session->age || |
1587 | session->state != ISCSI_STATE_LOGGED_IN) | |
1588 | return -ENOTCONN; | |
7996a778 MC |
1589 | return 0; |
1590 | } | |
1591 | ||
843c0a8a MC |
1592 | /* |
1593 | * Fail commands. session lock held and recv side suspended and xmit | |
1594 | * thread flushed | |
1595 | */ | |
6eabafbe MC |
1596 | static void fail_all_commands(struct iscsi_conn *conn, unsigned lun, |
1597 | int error) | |
843c0a8a | 1598 | { |
9c19a7d0 | 1599 | struct iscsi_task *task, *tmp; |
843c0a8a | 1600 | |
9c19a7d0 MC |
1601 | if (conn->task && (conn->task->sc->device->lun == lun || lun == -1)) |
1602 | conn->task = NULL; | |
843c0a8a MC |
1603 | |
1604 | /* flush pending */ | |
9c19a7d0 MC |
1605 | list_for_each_entry_safe(task, tmp, &conn->xmitqueue, running) { |
1606 | if (lun == task->sc->device->lun || lun == -1) { | |
1b2c7af8 MC |
1607 | ISCSI_DBG_SESSION(conn->session, |
1608 | "failing pending sc %p itt 0x%x\n", | |
1609 | task->sc, task->itt); | |
9c19a7d0 | 1610 | fail_command(conn, task, error << 16); |
843c0a8a MC |
1611 | } |
1612 | } | |
1613 | ||
9c19a7d0 MC |
1614 | list_for_each_entry_safe(task, tmp, &conn->requeue, running) { |
1615 | if (lun == task->sc->device->lun || lun == -1) { | |
1b2c7af8 MC |
1616 | ISCSI_DBG_SESSION(conn->session, |
1617 | "failing requeued sc %p itt 0x%x\n", | |
1618 | task->sc, task->itt); | |
9c19a7d0 | 1619 | fail_command(conn, task, error << 16); |
843c0a8a MC |
1620 | } |
1621 | } | |
1622 | ||
1623 | /* fail all other running */ | |
9c19a7d0 MC |
1624 | list_for_each_entry_safe(task, tmp, &conn->run_list, running) { |
1625 | if (lun == task->sc->device->lun || lun == -1) { | |
1b2c7af8 MC |
1626 | ISCSI_DBG_SESSION(conn->session, |
1627 | "failing in progress sc %p itt 0x%x\n", | |
1628 | task->sc, task->itt); | |
ac26d41d | 1629 | fail_command(conn, task, error << 16); |
843c0a8a MC |
1630 | } |
1631 | } | |
1632 | } | |
1633 | ||
b40977d9 | 1634 | void iscsi_suspend_tx(struct iscsi_conn *conn) |
6724add1 MC |
1635 | { |
1636 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
052d0144 MC |
1637 | if (!(conn->session->tt->caps & CAP_DATA_PATH_OFFLOAD)) |
1638 | scsi_flush_work(conn->session->host); | |
6724add1 | 1639 | } |
b40977d9 | 1640 | EXPORT_SYMBOL_GPL(iscsi_suspend_tx); |
6724add1 MC |
1641 | |
1642 | static void iscsi_start_tx(struct iscsi_conn *conn) | |
1643 | { | |
1644 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
052d0144 MC |
1645 | if (!(conn->session->tt->caps & CAP_DATA_PATH_OFFLOAD)) |
1646 | scsi_queue_work(conn->session->host, &conn->xmitwork); | |
6724add1 MC |
1647 | } |
1648 | ||
242f9dcb | 1649 | static enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *scmd) |
f6d5180c MC |
1650 | { |
1651 | struct iscsi_cls_session *cls_session; | |
1652 | struct iscsi_session *session; | |
1653 | struct iscsi_conn *conn; | |
242f9dcb | 1654 | enum blk_eh_timer_return rc = BLK_EH_NOT_HANDLED; |
f6d5180c MC |
1655 | |
1656 | cls_session = starget_to_session(scsi_target(scmd->device)); | |
75613521 | 1657 | session = cls_session->dd_data; |
f6d5180c | 1658 | |
1b2c7af8 | 1659 | ISCSI_DBG_SESSION(session, "scsi cmd %p timedout\n", scmd); |
f6d5180c MC |
1660 | |
1661 | spin_lock(&session->lock); | |
1662 | if (session->state != ISCSI_STATE_LOGGED_IN) { | |
1663 | /* | |
1664 | * We are probably in the middle of iscsi recovery so let | |
1665 | * that complete and handle the error. | |
1666 | */ | |
242f9dcb | 1667 | rc = BLK_EH_RESET_TIMER; |
f6d5180c MC |
1668 | goto done; |
1669 | } | |
1670 | ||
1671 | conn = session->leadconn; | |
1672 | if (!conn) { | |
1673 | /* In the middle of shuting down */ | |
242f9dcb | 1674 | rc = BLK_EH_RESET_TIMER; |
f6d5180c MC |
1675 | goto done; |
1676 | } | |
1677 | ||
1678 | if (!conn->recv_timeout && !conn->ping_timeout) | |
1679 | goto done; | |
1680 | /* | |
1681 | * if the ping timedout then we are in the middle of cleaning up | |
1682 | * and can let the iscsi eh handle it | |
1683 | */ | |
1684 | if (time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) + | |
1685 | (conn->ping_timeout * HZ), jiffies)) | |
242f9dcb | 1686 | rc = BLK_EH_RESET_TIMER; |
f6d5180c MC |
1687 | /* |
1688 | * if we are about to check the transport then give the command | |
1689 | * more time | |
1690 | */ | |
1691 | if (time_before_eq(conn->last_recv + (conn->recv_timeout * HZ), | |
1692 | jiffies)) | |
242f9dcb | 1693 | rc = BLK_EH_RESET_TIMER; |
f6d5180c | 1694 | /* if in the middle of checking the transport then give us more time */ |
9c19a7d0 | 1695 | if (conn->ping_task) |
242f9dcb | 1696 | rc = BLK_EH_RESET_TIMER; |
f6d5180c MC |
1697 | done: |
1698 | spin_unlock(&session->lock); | |
1b2c7af8 MC |
1699 | ISCSI_DBG_SESSION(session, "return %s\n", rc == BLK_EH_RESET_TIMER ? |
1700 | "timer reset" : "nh"); | |
f6d5180c MC |
1701 | return rc; |
1702 | } | |
1703 | ||
1704 | static void iscsi_check_transport_timeouts(unsigned long data) | |
1705 | { | |
1706 | struct iscsi_conn *conn = (struct iscsi_conn *)data; | |
1707 | struct iscsi_session *session = conn->session; | |
4cf10435 | 1708 | unsigned long recv_timeout, next_timeout = 0, last_recv; |
f6d5180c MC |
1709 | |
1710 | spin_lock(&session->lock); | |
1711 | if (session->state != ISCSI_STATE_LOGGED_IN) | |
1712 | goto done; | |
1713 | ||
4cf10435 MC |
1714 | recv_timeout = conn->recv_timeout; |
1715 | if (!recv_timeout) | |
f6d5180c MC |
1716 | goto done; |
1717 | ||
4cf10435 | 1718 | recv_timeout *= HZ; |
f6d5180c | 1719 | last_recv = conn->last_recv; |
9c19a7d0 | 1720 | if (conn->ping_task && |
4cf10435 | 1721 | time_before_eq(conn->last_ping + (conn->ping_timeout * HZ), |
f6d5180c | 1722 | jiffies)) { |
322d739d MC |
1723 | iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs " |
1724 | "expired, last rx %lu, last ping %lu, " | |
1725 | "now %lu\n", conn->ping_timeout, last_recv, | |
1726 | conn->last_ping, jiffies); | |
f6d5180c MC |
1727 | spin_unlock(&session->lock); |
1728 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1729 | return; | |
1730 | } | |
1731 | ||
4cf10435 | 1732 | if (time_before_eq(last_recv + recv_timeout, jiffies)) { |
c8611f97 | 1733 | /* send a ping to try to provoke some traffic */ |
1b2c7af8 | 1734 | ISCSI_DBG_CONN(conn, "Sending nopout as ping\n"); |
c8611f97 | 1735 | iscsi_send_nopout(conn, NULL); |
4cf10435 | 1736 | next_timeout = conn->last_ping + (conn->ping_timeout * HZ); |
ad294e9c | 1737 | } else |
4cf10435 | 1738 | next_timeout = last_recv + recv_timeout; |
f6d5180c | 1739 | |
1b2c7af8 | 1740 | ISCSI_DBG_CONN(conn, "Setting next tmo %lu\n", next_timeout); |
ad294e9c | 1741 | mod_timer(&conn->transport_timer, next_timeout); |
f6d5180c MC |
1742 | done: |
1743 | spin_unlock(&session->lock); | |
1744 | } | |
1745 | ||
9c19a7d0 | 1746 | static void iscsi_prep_abort_task_pdu(struct iscsi_task *task, |
843c0a8a MC |
1747 | struct iscsi_tm *hdr) |
1748 | { | |
1749 | memset(hdr, 0, sizeof(*hdr)); | |
1750 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
1751 | hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK; | |
1752 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
577577da MC |
1753 | memcpy(hdr->lun, task->lun, sizeof(hdr->lun)); |
1754 | hdr->rtt = task->hdr_itt; | |
1755 | hdr->refcmdsn = task->cmdsn; | |
843c0a8a MC |
1756 | } |
1757 | ||
7996a778 MC |
1758 | int iscsi_eh_abort(struct scsi_cmnd *sc) |
1759 | { | |
75613521 MC |
1760 | struct iscsi_cls_session *cls_session; |
1761 | struct iscsi_session *session; | |
f47f2cf5 | 1762 | struct iscsi_conn *conn; |
9c19a7d0 | 1763 | struct iscsi_task *task; |
843c0a8a MC |
1764 | struct iscsi_tm *hdr; |
1765 | int rc, age; | |
7996a778 | 1766 | |
75613521 MC |
1767 | cls_session = starget_to_session(scsi_target(sc->device)); |
1768 | session = cls_session->dd_data; | |
1769 | ||
6724add1 MC |
1770 | mutex_lock(&session->eh_mutex); |
1771 | spin_lock_bh(&session->lock); | |
f47f2cf5 MC |
1772 | /* |
1773 | * if session was ISCSI_STATE_IN_RECOVERY then we may not have | |
1774 | * got the command. | |
1775 | */ | |
1776 | if (!sc->SCp.ptr) { | |
1b2c7af8 MC |
1777 | ISCSI_DBG_SESSION(session, "sc never reached iscsi layer or " |
1778 | "it completed.\n"); | |
6724add1 MC |
1779 | spin_unlock_bh(&session->lock); |
1780 | mutex_unlock(&session->eh_mutex); | |
f47f2cf5 MC |
1781 | return SUCCESS; |
1782 | } | |
1783 | ||
7996a778 MC |
1784 | /* |
1785 | * If we are not logged in or we have started a new session | |
1786 | * then let the host reset code handle this | |
1787 | */ | |
843c0a8a MC |
1788 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN || |
1789 | sc->SCp.phase != session->age) { | |
1790 | spin_unlock_bh(&session->lock); | |
1791 | mutex_unlock(&session->eh_mutex); | |
1792 | return FAILED; | |
1793 | } | |
1794 | ||
1795 | conn = session->leadconn; | |
1796 | conn->eh_abort_cnt++; | |
1797 | age = session->age; | |
1798 | ||
9c19a7d0 | 1799 | task = (struct iscsi_task *)sc->SCp.ptr; |
1b2c7af8 MC |
1800 | ISCSI_DBG_SESSION(session, "aborting [sc %p itt 0x%x]\n", |
1801 | sc, task->itt); | |
7996a778 | 1802 | |
9c19a7d0 MC |
1803 | /* task completed before time out */ |
1804 | if (!task->sc) { | |
1b2c7af8 MC |
1805 | ISCSI_DBG_SESSION(session, "sc completed while abort in " |
1806 | "progress\n"); | |
77a23c21 | 1807 | goto success; |
7ea8b828 | 1808 | } |
7996a778 | 1809 | |
9c19a7d0 MC |
1810 | if (task->state == ISCSI_TASK_PENDING) { |
1811 | fail_command(conn, task, DID_ABORT << 16); | |
77a23c21 MC |
1812 | goto success; |
1813 | } | |
7996a778 | 1814 | |
843c0a8a MC |
1815 | /* only have one tmf outstanding at a time */ |
1816 | if (conn->tmf_state != TMF_INITIAL) | |
7996a778 | 1817 | goto failed; |
843c0a8a | 1818 | conn->tmf_state = TMF_QUEUED; |
7996a778 | 1819 | |
843c0a8a | 1820 | hdr = &conn->tmhdr; |
9c19a7d0 | 1821 | iscsi_prep_abort_task_pdu(task, hdr); |
843c0a8a | 1822 | |
9c19a7d0 | 1823 | if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout)) { |
843c0a8a MC |
1824 | rc = FAILED; |
1825 | goto failed; | |
1826 | } | |
1827 | ||
1828 | switch (conn->tmf_state) { | |
1829 | case TMF_SUCCESS: | |
77a23c21 | 1830 | spin_unlock_bh(&session->lock); |
913e5bf4 MC |
1831 | /* |
1832 | * stop tx side incase the target had sent a abort rsp but | |
1833 | * the initiator was still writing out data. | |
1834 | */ | |
6724add1 | 1835 | iscsi_suspend_tx(conn); |
77a23c21 | 1836 | /* |
913e5bf4 MC |
1837 | * we do not stop the recv side because targets have been |
1838 | * good and have never sent us a successful tmf response | |
1839 | * then sent more data for the cmd. | |
77a23c21 | 1840 | */ |
77a23c21 | 1841 | spin_lock(&session->lock); |
9c19a7d0 | 1842 | fail_command(conn, task, DID_ABORT << 16); |
843c0a8a | 1843 | conn->tmf_state = TMF_INITIAL; |
77a23c21 | 1844 | spin_unlock(&session->lock); |
6724add1 | 1845 | iscsi_start_tx(conn); |
77a23c21 | 1846 | goto success_unlocked; |
843c0a8a MC |
1847 | case TMF_TIMEDOUT: |
1848 | spin_unlock_bh(&session->lock); | |
1849 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1850 | goto failed_unlocked; | |
1851 | case TMF_NOT_FOUND: | |
1852 | if (!sc->SCp.ptr) { | |
1853 | conn->tmf_state = TMF_INITIAL; | |
9c19a7d0 | 1854 | /* task completed before tmf abort response */ |
1b2c7af8 MC |
1855 | ISCSI_DBG_SESSION(session, "sc completed while abort " |
1856 | "in progress\n"); | |
77a23c21 | 1857 | goto success; |
7ea8b828 MC |
1858 | } |
1859 | /* fall through */ | |
1860 | default: | |
843c0a8a MC |
1861 | conn->tmf_state = TMF_INITIAL; |
1862 | goto failed; | |
7996a778 MC |
1863 | } |
1864 | ||
77a23c21 | 1865 | success: |
7996a778 | 1866 | spin_unlock_bh(&session->lock); |
77a23c21 | 1867 | success_unlocked: |
1b2c7af8 MC |
1868 | ISCSI_DBG_SESSION(session, "abort success [sc %p itt 0x%x]\n", |
1869 | sc, task->itt); | |
6724add1 | 1870 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1871 | return SUCCESS; |
1872 | ||
1873 | failed: | |
1874 | spin_unlock_bh(&session->lock); | |
77a23c21 | 1875 | failed_unlocked: |
1b2c7af8 MC |
1876 | ISCSI_DBG_SESSION(session, "abort failed [sc %p itt 0x%x]\n", sc, |
1877 | task ? task->itt : 0); | |
6724add1 | 1878 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1879 | return FAILED; |
1880 | } | |
1881 | EXPORT_SYMBOL_GPL(iscsi_eh_abort); | |
1882 | ||
843c0a8a MC |
1883 | static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr) |
1884 | { | |
1885 | memset(hdr, 0, sizeof(*hdr)); | |
1886 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
1887 | hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK; | |
1888 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
1889 | int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun); | |
f6d5180c | 1890 | hdr->rtt = RESERVED_ITT; |
843c0a8a MC |
1891 | } |
1892 | ||
1893 | int iscsi_eh_device_reset(struct scsi_cmnd *sc) | |
1894 | { | |
75613521 MC |
1895 | struct iscsi_cls_session *cls_session; |
1896 | struct iscsi_session *session; | |
843c0a8a MC |
1897 | struct iscsi_conn *conn; |
1898 | struct iscsi_tm *hdr; | |
1899 | int rc = FAILED; | |
1900 | ||
75613521 MC |
1901 | cls_session = starget_to_session(scsi_target(sc->device)); |
1902 | session = cls_session->dd_data; | |
1903 | ||
1b2c7af8 MC |
1904 | ISCSI_DBG_SESSION(session, "LU Reset [sc %p lun %u]\n", |
1905 | sc, sc->device->lun); | |
843c0a8a MC |
1906 | |
1907 | mutex_lock(&session->eh_mutex); | |
1908 | spin_lock_bh(&session->lock); | |
1909 | /* | |
1910 | * Just check if we are not logged in. We cannot check for | |
1911 | * the phase because the reset could come from a ioctl. | |
1912 | */ | |
1913 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN) | |
1914 | goto unlock; | |
1915 | conn = session->leadconn; | |
1916 | ||
1917 | /* only have one tmf outstanding at a time */ | |
1918 | if (conn->tmf_state != TMF_INITIAL) | |
1919 | goto unlock; | |
1920 | conn->tmf_state = TMF_QUEUED; | |
1921 | ||
1922 | hdr = &conn->tmhdr; | |
1923 | iscsi_prep_lun_reset_pdu(sc, hdr); | |
1924 | ||
9c19a7d0 | 1925 | if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age, |
f6d5180c | 1926 | session->lu_reset_timeout)) { |
843c0a8a MC |
1927 | rc = FAILED; |
1928 | goto unlock; | |
1929 | } | |
1930 | ||
1931 | switch (conn->tmf_state) { | |
1932 | case TMF_SUCCESS: | |
1933 | break; | |
1934 | case TMF_TIMEDOUT: | |
1935 | spin_unlock_bh(&session->lock); | |
1936 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1937 | goto done; | |
1938 | default: | |
1939 | conn->tmf_state = TMF_INITIAL; | |
1940 | goto unlock; | |
1941 | } | |
1942 | ||
1943 | rc = SUCCESS; | |
1944 | spin_unlock_bh(&session->lock); | |
1945 | ||
1946 | iscsi_suspend_tx(conn); | |
913e5bf4 | 1947 | |
a3439148 | 1948 | spin_lock_bh(&session->lock); |
6eabafbe | 1949 | fail_all_commands(conn, sc->device->lun, DID_ERROR); |
843c0a8a | 1950 | conn->tmf_state = TMF_INITIAL; |
a3439148 | 1951 | spin_unlock_bh(&session->lock); |
843c0a8a MC |
1952 | |
1953 | iscsi_start_tx(conn); | |
1954 | goto done; | |
1955 | ||
1956 | unlock: | |
1957 | spin_unlock_bh(&session->lock); | |
1958 | done: | |
1b2c7af8 MC |
1959 | ISCSI_DBG_SESSION(session, "dev reset result = %s\n", |
1960 | rc == SUCCESS ? "SUCCESS" : "FAILED"); | |
843c0a8a MC |
1961 | mutex_unlock(&session->eh_mutex); |
1962 | return rc; | |
1963 | } | |
1964 | EXPORT_SYMBOL_GPL(iscsi_eh_device_reset); | |
1965 | ||
6320377f OK |
1966 | /* |
1967 | * Pre-allocate a pool of @max items of @item_size. By default, the pool | |
1968 | * should be accessed via kfifo_{get,put} on q->queue. | |
1969 | * Optionally, the caller can obtain the array of object pointers | |
1970 | * by passing in a non-NULL @items pointer | |
1971 | */ | |
7996a778 | 1972 | int |
6320377f | 1973 | iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size) |
7996a778 | 1974 | { |
6320377f | 1975 | int i, num_arrays = 1; |
7996a778 | 1976 | |
6320377f | 1977 | memset(q, 0, sizeof(*q)); |
7996a778 MC |
1978 | |
1979 | q->max = max; | |
6320377f OK |
1980 | |
1981 | /* If the user passed an items pointer, he wants a copy of | |
1982 | * the array. */ | |
1983 | if (items) | |
1984 | num_arrays++; | |
1985 | q->pool = kzalloc(num_arrays * max * sizeof(void*), GFP_KERNEL); | |
1986 | if (q->pool == NULL) | |
f474a37b | 1987 | return -ENOMEM; |
7996a778 MC |
1988 | |
1989 | q->queue = kfifo_init((void*)q->pool, max * sizeof(void*), | |
1990 | GFP_KERNEL, NULL); | |
6320377f OK |
1991 | if (q->queue == ERR_PTR(-ENOMEM)) |
1992 | goto enomem; | |
7996a778 MC |
1993 | |
1994 | for (i = 0; i < max; i++) { | |
6320377f | 1995 | q->pool[i] = kzalloc(item_size, GFP_KERNEL); |
7996a778 | 1996 | if (q->pool[i] == NULL) { |
6320377f OK |
1997 | q->max = i; |
1998 | goto enomem; | |
7996a778 | 1999 | } |
7996a778 MC |
2000 | __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*)); |
2001 | } | |
6320377f OK |
2002 | |
2003 | if (items) { | |
2004 | *items = q->pool + max; | |
2005 | memcpy(*items, q->pool, max * sizeof(void *)); | |
2006 | } | |
2007 | ||
7996a778 | 2008 | return 0; |
6320377f OK |
2009 | |
2010 | enomem: | |
2011 | iscsi_pool_free(q); | |
2012 | return -ENOMEM; | |
7996a778 MC |
2013 | } |
2014 | EXPORT_SYMBOL_GPL(iscsi_pool_init); | |
2015 | ||
6320377f | 2016 | void iscsi_pool_free(struct iscsi_pool *q) |
7996a778 MC |
2017 | { |
2018 | int i; | |
2019 | ||
2020 | for (i = 0; i < q->max; i++) | |
6320377f | 2021 | kfree(q->pool[i]); |
f474a37b | 2022 | kfree(q->pool); |
2f5899a3 | 2023 | kfree(q->queue); |
7996a778 MC |
2024 | } |
2025 | EXPORT_SYMBOL_GPL(iscsi_pool_free); | |
2026 | ||
a4804cd6 MC |
2027 | /** |
2028 | * iscsi_host_add - add host to system | |
2029 | * @shost: scsi host | |
2030 | * @pdev: parent device | |
2031 | * | |
2032 | * This should be called by partial offload and software iscsi drivers | |
2033 | * to add a host to the system. | |
2034 | */ | |
2035 | int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev) | |
2036 | { | |
8e9a20ce MC |
2037 | if (!shost->can_queue) |
2038 | shost->can_queue = ISCSI_DEF_XMIT_CMDS_MAX; | |
2039 | ||
308cec14 MC |
2040 | if (!shost->transportt->eh_timed_out) |
2041 | shost->transportt->eh_timed_out = iscsi_eh_cmd_timed_out; | |
a4804cd6 MC |
2042 | return scsi_add_host(shost, pdev); |
2043 | } | |
2044 | EXPORT_SYMBOL_GPL(iscsi_host_add); | |
2045 | ||
2046 | /** | |
2047 | * iscsi_host_alloc - allocate a host and driver data | |
2048 | * @sht: scsi host template | |
2049 | * @dd_data_size: driver host data size | |
2050 | * @qdepth: default device queue depth | |
2051 | * | |
2052 | * This should be called by partial offload and software iscsi drivers. | |
2053 | * To access the driver specific memory use the iscsi_host_priv() macro. | |
2054 | */ | |
2055 | struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht, | |
2056 | int dd_data_size, uint16_t qdepth) | |
75613521 | 2057 | { |
a4804cd6 | 2058 | struct Scsi_Host *shost; |
e5bd7b54 | 2059 | struct iscsi_host *ihost; |
a4804cd6 MC |
2060 | |
2061 | shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size); | |
2062 | if (!shost) | |
2063 | return NULL; | |
a4804cd6 | 2064 | |
75613521 MC |
2065 | if (qdepth > ISCSI_MAX_CMD_PER_LUN || qdepth < 1) { |
2066 | if (qdepth != 0) | |
2067 | printk(KERN_ERR "iscsi: invalid queue depth of %d. " | |
2068 | "Queue depth must be between 1 and %d.\n", | |
2069 | qdepth, ISCSI_MAX_CMD_PER_LUN); | |
2070 | qdepth = ISCSI_DEF_CMD_PER_LUN; | |
2071 | } | |
75613521 | 2072 | shost->cmd_per_lun = qdepth; |
e5bd7b54 MC |
2073 | |
2074 | ihost = shost_priv(shost); | |
2075 | spin_lock_init(&ihost->lock); | |
2076 | ihost->state = ISCSI_HOST_SETUP; | |
2077 | ihost->num_sessions = 0; | |
2078 | init_waitqueue_head(&ihost->session_removal_wq); | |
a4804cd6 MC |
2079 | return shost; |
2080 | } | |
2081 | EXPORT_SYMBOL_GPL(iscsi_host_alloc); | |
2082 | ||
e5bd7b54 MC |
2083 | static void iscsi_notify_host_removed(struct iscsi_cls_session *cls_session) |
2084 | { | |
2085 | iscsi_session_failure(cls_session, ISCSI_ERR_INVALID_HOST); | |
2086 | } | |
2087 | ||
a4804cd6 MC |
2088 | /** |
2089 | * iscsi_host_remove - remove host and sessions | |
2090 | * @shost: scsi host | |
2091 | * | |
e5bd7b54 MC |
2092 | * If there are any sessions left, this will initiate the removal and wait |
2093 | * for the completion. | |
a4804cd6 MC |
2094 | */ |
2095 | void iscsi_host_remove(struct Scsi_Host *shost) | |
2096 | { | |
e5bd7b54 MC |
2097 | struct iscsi_host *ihost = shost_priv(shost); |
2098 | unsigned long flags; | |
2099 | ||
2100 | spin_lock_irqsave(&ihost->lock, flags); | |
2101 | ihost->state = ISCSI_HOST_REMOVED; | |
2102 | spin_unlock_irqrestore(&ihost->lock, flags); | |
2103 | ||
2104 | iscsi_host_for_each_session(shost, iscsi_notify_host_removed); | |
2105 | wait_event_interruptible(ihost->session_removal_wq, | |
2106 | ihost->num_sessions == 0); | |
2107 | if (signal_pending(current)) | |
2108 | flush_signals(current); | |
2109 | ||
a4804cd6 | 2110 | scsi_remove_host(shost); |
75613521 | 2111 | } |
a4804cd6 | 2112 | EXPORT_SYMBOL_GPL(iscsi_host_remove); |
7996a778 | 2113 | |
a4804cd6 | 2114 | void iscsi_host_free(struct Scsi_Host *shost) |
75613521 MC |
2115 | { |
2116 | struct iscsi_host *ihost = shost_priv(shost); | |
7996a778 | 2117 | |
75613521 MC |
2118 | kfree(ihost->netdev); |
2119 | kfree(ihost->hwaddress); | |
2120 | kfree(ihost->initiatorname); | |
a4804cd6 | 2121 | scsi_host_put(shost); |
75613521 | 2122 | } |
a4804cd6 | 2123 | EXPORT_SYMBOL_GPL(iscsi_host_free); |
7996a778 | 2124 | |
e5bd7b54 MC |
2125 | static void iscsi_host_dec_session_cnt(struct Scsi_Host *shost) |
2126 | { | |
2127 | struct iscsi_host *ihost = shost_priv(shost); | |
2128 | unsigned long flags; | |
2129 | ||
2130 | shost = scsi_host_get(shost); | |
2131 | if (!shost) { | |
2132 | printk(KERN_ERR "Invalid state. Cannot notify host removal " | |
2133 | "of session teardown event because host already " | |
2134 | "removed.\n"); | |
2135 | return; | |
2136 | } | |
2137 | ||
2138 | spin_lock_irqsave(&ihost->lock, flags); | |
2139 | ihost->num_sessions--; | |
2140 | if (ihost->num_sessions == 0) | |
2141 | wake_up(&ihost->session_removal_wq); | |
2142 | spin_unlock_irqrestore(&ihost->lock, flags); | |
2143 | scsi_host_put(shost); | |
2144 | } | |
2145 | ||
7996a778 MC |
2146 | /** |
2147 | * iscsi_session_setup - create iscsi cls session and host and session | |
7996a778 | 2148 | * @iscsit: iscsi transport template |
75613521 MC |
2149 | * @shost: scsi host |
2150 | * @cmds_max: session can queue | |
9c19a7d0 | 2151 | * @cmd_task_size: LLD task private data size |
7996a778 | 2152 | * @initial_cmdsn: initial CmdSN |
7996a778 MC |
2153 | * |
2154 | * This can be used by software iscsi_transports that allocate | |
2155 | * a session per scsi host. | |
3cf7b233 MC |
2156 | * |
2157 | * Callers should set cmds_max to the largest total numer (mgmt + scsi) of | |
2158 | * tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks | |
2159 | * for nop handling and login/logout requests. | |
75613521 | 2160 | */ |
7996a778 | 2161 | struct iscsi_cls_session * |
75613521 | 2162 | iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost, |
3cf7b233 | 2163 | uint16_t cmds_max, int cmd_task_size, |
7970634b | 2164 | uint32_t initial_cmdsn, unsigned int id) |
7996a778 | 2165 | { |
e5bd7b54 | 2166 | struct iscsi_host *ihost = shost_priv(shost); |
7996a778 MC |
2167 | struct iscsi_session *session; |
2168 | struct iscsi_cls_session *cls_session; | |
3cf7b233 | 2169 | int cmd_i, scsi_cmds, total_cmds = cmds_max; |
e5bd7b54 MC |
2170 | unsigned long flags; |
2171 | ||
2172 | spin_lock_irqsave(&ihost->lock, flags); | |
2173 | if (ihost->state == ISCSI_HOST_REMOVED) { | |
2174 | spin_unlock_irqrestore(&ihost->lock, flags); | |
2175 | return NULL; | |
2176 | } | |
2177 | ihost->num_sessions++; | |
2178 | spin_unlock_irqrestore(&ihost->lock, flags); | |
8e9a20ce MC |
2179 | |
2180 | if (!total_cmds) | |
2181 | total_cmds = ISCSI_DEF_XMIT_CMDS_MAX; | |
3e5c28ad | 2182 | /* |
3cf7b233 MC |
2183 | * The iscsi layer needs some tasks for nop handling and tmfs, |
2184 | * so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX | |
2185 | * + 1 command for scsi IO. | |
3e5c28ad | 2186 | */ |
3cf7b233 MC |
2187 | if (total_cmds < ISCSI_TOTAL_CMDS_MIN) { |
2188 | printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " | |
2189 | "must be a power of two that is at least %d.\n", | |
2190 | total_cmds, ISCSI_TOTAL_CMDS_MIN); | |
e5bd7b54 | 2191 | goto dec_session_count; |
3cf7b233 MC |
2192 | } |
2193 | ||
2194 | if (total_cmds > ISCSI_TOTAL_CMDS_MAX) { | |
2195 | printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " | |
2196 | "must be a power of 2 less than or equal to %d.\n", | |
2197 | cmds_max, ISCSI_TOTAL_CMDS_MAX); | |
2198 | total_cmds = ISCSI_TOTAL_CMDS_MAX; | |
2199 | } | |
2200 | ||
2201 | if (!is_power_of_2(total_cmds)) { | |
2202 | printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " | |
2203 | "must be a power of 2.\n", total_cmds); | |
2204 | total_cmds = rounddown_pow_of_two(total_cmds); | |
2205 | if (total_cmds < ISCSI_TOTAL_CMDS_MIN) | |
2206 | return NULL; | |
2207 | printk(KERN_INFO "iscsi: Rounding can_queue to %d.\n", | |
2208 | total_cmds); | |
1548271e | 2209 | } |
3cf7b233 | 2210 | scsi_cmds = total_cmds - ISCSI_MGMT_CMDS_MAX; |
1548271e | 2211 | |
5d91e209 MC |
2212 | cls_session = iscsi_alloc_session(shost, iscsit, |
2213 | sizeof(struct iscsi_session)); | |
75613521 | 2214 | if (!cls_session) |
e5bd7b54 | 2215 | goto dec_session_count; |
75613521 MC |
2216 | session = cls_session->dd_data; |
2217 | session->cls_session = cls_session; | |
7996a778 MC |
2218 | session->host = shost; |
2219 | session->state = ISCSI_STATE_FREE; | |
f6d5180c | 2220 | session->fast_abort = 1; |
4cd49ea1 MC |
2221 | session->lu_reset_timeout = 15; |
2222 | session->abort_timeout = 10; | |
3cf7b233 MC |
2223 | session->scsi_cmds_max = scsi_cmds; |
2224 | session->cmds_max = total_cmds; | |
e0726407 | 2225 | session->queued_cmdsn = session->cmdsn = initial_cmdsn; |
7996a778 MC |
2226 | session->exp_cmdsn = initial_cmdsn + 1; |
2227 | session->max_cmdsn = initial_cmdsn + 1; | |
2228 | session->max_r2t = 1; | |
2229 | session->tt = iscsit; | |
6724add1 | 2230 | mutex_init(&session->eh_mutex); |
75613521 | 2231 | spin_lock_init(&session->lock); |
7996a778 MC |
2232 | |
2233 | /* initialize SCSI PDU commands pool */ | |
2234 | if (iscsi_pool_init(&session->cmdpool, session->cmds_max, | |
2235 | (void***)&session->cmds, | |
9c19a7d0 | 2236 | cmd_task_size + sizeof(struct iscsi_task))) |
7996a778 MC |
2237 | goto cmdpool_alloc_fail; |
2238 | ||
2239 | /* pre-format cmds pool with ITT */ | |
2240 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
9c19a7d0 | 2241 | struct iscsi_task *task = session->cmds[cmd_i]; |
7996a778 | 2242 | |
9c19a7d0 MC |
2243 | if (cmd_task_size) |
2244 | task->dd_data = &task[1]; | |
2245 | task->itt = cmd_i; | |
2246 | INIT_LIST_HEAD(&task->running); | |
7996a778 MC |
2247 | } |
2248 | ||
f53a88da | 2249 | if (!try_module_get(iscsit->owner)) |
75613521 | 2250 | goto module_get_fail; |
7996a778 | 2251 | |
7970634b | 2252 | if (iscsi_add_session(cls_session, id)) |
75613521 | 2253 | goto cls_session_fail; |
e5bd7b54 | 2254 | |
7996a778 MC |
2255 | return cls_session; |
2256 | ||
2257 | cls_session_fail: | |
75613521 MC |
2258 | module_put(iscsit->owner); |
2259 | module_get_fail: | |
6320377f | 2260 | iscsi_pool_free(&session->cmdpool); |
7996a778 | 2261 | cmdpool_alloc_fail: |
75613521 | 2262 | iscsi_free_session(cls_session); |
e5bd7b54 MC |
2263 | dec_session_count: |
2264 | iscsi_host_dec_session_cnt(shost); | |
7996a778 MC |
2265 | return NULL; |
2266 | } | |
2267 | EXPORT_SYMBOL_GPL(iscsi_session_setup); | |
2268 | ||
2269 | /** | |
2270 | * iscsi_session_teardown - destroy session, host, and cls_session | |
75613521 | 2271 | * @cls_session: iscsi session |
7996a778 | 2272 | * |
75613521 MC |
2273 | * The driver must have called iscsi_remove_session before |
2274 | * calling this. | |
2275 | */ | |
7996a778 MC |
2276 | void iscsi_session_teardown(struct iscsi_cls_session *cls_session) |
2277 | { | |
75613521 | 2278 | struct iscsi_session *session = cls_session->dd_data; |
63f75cc8 | 2279 | struct module *owner = cls_session->transport->owner; |
e5bd7b54 | 2280 | struct Scsi_Host *shost = session->host; |
7996a778 | 2281 | |
6320377f | 2282 | iscsi_pool_free(&session->cmdpool); |
7996a778 | 2283 | |
b2c64167 MC |
2284 | kfree(session->password); |
2285 | kfree(session->password_in); | |
2286 | kfree(session->username); | |
2287 | kfree(session->username_in); | |
f3ff0c36 | 2288 | kfree(session->targetname); |
88dfd340 MC |
2289 | kfree(session->initiatorname); |
2290 | kfree(session->ifacename); | |
f3ff0c36 | 2291 | |
75613521 | 2292 | iscsi_destroy_session(cls_session); |
e5bd7b54 | 2293 | iscsi_host_dec_session_cnt(shost); |
63f75cc8 | 2294 | module_put(owner); |
7996a778 MC |
2295 | } |
2296 | EXPORT_SYMBOL_GPL(iscsi_session_teardown); | |
2297 | ||
2298 | /** | |
2299 | * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn | |
2300 | * @cls_session: iscsi_cls_session | |
5d91e209 | 2301 | * @dd_size: private driver data size |
7996a778 | 2302 | * @conn_idx: cid |
5d91e209 | 2303 | */ |
7996a778 | 2304 | struct iscsi_cls_conn * |
5d91e209 MC |
2305 | iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size, |
2306 | uint32_t conn_idx) | |
7996a778 | 2307 | { |
75613521 | 2308 | struct iscsi_session *session = cls_session->dd_data; |
7996a778 MC |
2309 | struct iscsi_conn *conn; |
2310 | struct iscsi_cls_conn *cls_conn; | |
d36ab6f3 | 2311 | char *data; |
7996a778 | 2312 | |
5d91e209 MC |
2313 | cls_conn = iscsi_create_conn(cls_session, sizeof(*conn) + dd_size, |
2314 | conn_idx); | |
7996a778 MC |
2315 | if (!cls_conn) |
2316 | return NULL; | |
2317 | conn = cls_conn->dd_data; | |
5d91e209 | 2318 | memset(conn, 0, sizeof(*conn) + dd_size); |
7996a778 | 2319 | |
5d91e209 | 2320 | conn->dd_data = cls_conn->dd_data + sizeof(*conn); |
7996a778 MC |
2321 | conn->session = session; |
2322 | conn->cls_conn = cls_conn; | |
2323 | conn->c_stage = ISCSI_CONN_INITIAL_STAGE; | |
2324 | conn->id = conn_idx; | |
2325 | conn->exp_statsn = 0; | |
843c0a8a | 2326 | conn->tmf_state = TMF_INITIAL; |
f6d5180c MC |
2327 | |
2328 | init_timer(&conn->transport_timer); | |
2329 | conn->transport_timer.data = (unsigned long)conn; | |
2330 | conn->transport_timer.function = iscsi_check_transport_timeouts; | |
2331 | ||
7996a778 MC |
2332 | INIT_LIST_HEAD(&conn->run_list); |
2333 | INIT_LIST_HEAD(&conn->mgmt_run_list); | |
843c0a8a | 2334 | INIT_LIST_HEAD(&conn->mgmtqueue); |
b6c395ed | 2335 | INIT_LIST_HEAD(&conn->xmitqueue); |
843c0a8a | 2336 | INIT_LIST_HEAD(&conn->requeue); |
c4028958 | 2337 | INIT_WORK(&conn->xmitwork, iscsi_xmitworker); |
7996a778 | 2338 | |
9c19a7d0 | 2339 | /* allocate login_task used for the login/text sequences */ |
7996a778 | 2340 | spin_lock_bh(&session->lock); |
3e5c28ad | 2341 | if (!__kfifo_get(session->cmdpool.queue, |
9c19a7d0 | 2342 | (void*)&conn->login_task, |
7996a778 MC |
2343 | sizeof(void*))) { |
2344 | spin_unlock_bh(&session->lock); | |
9c19a7d0 | 2345 | goto login_task_alloc_fail; |
7996a778 MC |
2346 | } |
2347 | spin_unlock_bh(&session->lock); | |
2348 | ||
cfeb2cf9 MC |
2349 | data = (char *) __get_free_pages(GFP_KERNEL, |
2350 | get_order(ISCSI_DEF_MAX_RECV_SEG_LEN)); | |
d36ab6f3 | 2351 | if (!data) |
9c19a7d0 MC |
2352 | goto login_task_data_alloc_fail; |
2353 | conn->login_task->data = conn->data = data; | |
d36ab6f3 | 2354 | |
843c0a8a | 2355 | init_timer(&conn->tmf_timer); |
7996a778 MC |
2356 | init_waitqueue_head(&conn->ehwait); |
2357 | ||
2358 | return cls_conn; | |
2359 | ||
9c19a7d0 MC |
2360 | login_task_data_alloc_fail: |
2361 | __kfifo_put(session->cmdpool.queue, (void*)&conn->login_task, | |
d36ab6f3 | 2362 | sizeof(void*)); |
9c19a7d0 | 2363 | login_task_alloc_fail: |
7996a778 MC |
2364 | iscsi_destroy_conn(cls_conn); |
2365 | return NULL; | |
2366 | } | |
2367 | EXPORT_SYMBOL_GPL(iscsi_conn_setup); | |
2368 | ||
2369 | /** | |
2370 | * iscsi_conn_teardown - teardown iscsi connection | |
2371 | * cls_conn: iscsi class connection | |
2372 | * | |
2373 | * TODO: we may need to make this into a two step process | |
2374 | * like scsi-mls remove + put host | |
2375 | */ | |
2376 | void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn) | |
2377 | { | |
2378 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2379 | struct iscsi_session *session = conn->session; | |
2380 | unsigned long flags; | |
2381 | ||
f6d5180c MC |
2382 | del_timer_sync(&conn->transport_timer); |
2383 | ||
7996a778 MC |
2384 | spin_lock_bh(&session->lock); |
2385 | conn->c_stage = ISCSI_CONN_CLEANUP_WAIT; | |
2386 | if (session->leadconn == conn) { | |
2387 | /* | |
2388 | * leading connection? then give up on recovery. | |
2389 | */ | |
2390 | session->state = ISCSI_STATE_TERMINATE; | |
2391 | wake_up(&conn->ehwait); | |
2392 | } | |
2393 | spin_unlock_bh(&session->lock); | |
2394 | ||
7996a778 MC |
2395 | /* |
2396 | * Block until all in-progress commands for this connection | |
2397 | * time out or fail. | |
2398 | */ | |
2399 | for (;;) { | |
2400 | spin_lock_irqsave(session->host->host_lock, flags); | |
2401 | if (!session->host->host_busy) { /* OK for ERL == 0 */ | |
2402 | spin_unlock_irqrestore(session->host->host_lock, flags); | |
2403 | break; | |
2404 | } | |
2405 | spin_unlock_irqrestore(session->host->host_lock, flags); | |
2406 | msleep_interruptible(500); | |
322d739d MC |
2407 | iscsi_conn_printk(KERN_INFO, conn, "iscsi conn_destroy(): " |
2408 | "host_busy %d host_failed %d\n", | |
2409 | session->host->host_busy, | |
2410 | session->host->host_failed); | |
7996a778 MC |
2411 | /* |
2412 | * force eh_abort() to unblock | |
2413 | */ | |
2414 | wake_up(&conn->ehwait); | |
2415 | } | |
2416 | ||
779ea120 | 2417 | /* flush queued up work because we free the connection below */ |
843c0a8a | 2418 | iscsi_suspend_tx(conn); |
779ea120 | 2419 | |
7996a778 | 2420 | spin_lock_bh(&session->lock); |
cfeb2cf9 MC |
2421 | free_pages((unsigned long) conn->data, |
2422 | get_order(ISCSI_DEF_MAX_RECV_SEG_LEN)); | |
f3ff0c36 | 2423 | kfree(conn->persistent_address); |
9c19a7d0 | 2424 | __kfifo_put(session->cmdpool.queue, (void*)&conn->login_task, |
7996a778 | 2425 | sizeof(void*)); |
e0726407 | 2426 | if (session->leadconn == conn) |
7996a778 | 2427 | session->leadconn = NULL; |
7996a778 MC |
2428 | spin_unlock_bh(&session->lock); |
2429 | ||
7996a778 MC |
2430 | iscsi_destroy_conn(cls_conn); |
2431 | } | |
2432 | EXPORT_SYMBOL_GPL(iscsi_conn_teardown); | |
2433 | ||
2434 | int iscsi_conn_start(struct iscsi_cls_conn *cls_conn) | |
2435 | { | |
2436 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2437 | struct iscsi_session *session = conn->session; | |
2438 | ||
ffd0436e | 2439 | if (!session) { |
322d739d MC |
2440 | iscsi_conn_printk(KERN_ERR, conn, |
2441 | "can't start unbound connection\n"); | |
7996a778 MC |
2442 | return -EPERM; |
2443 | } | |
2444 | ||
db98ccde MC |
2445 | if ((session->imm_data_en || !session->initial_r2t_en) && |
2446 | session->first_burst > session->max_burst) { | |
322d739d MC |
2447 | iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: " |
2448 | "first_burst %d max_burst %d\n", | |
2449 | session->first_burst, session->max_burst); | |
ffd0436e MC |
2450 | return -EINVAL; |
2451 | } | |
2452 | ||
f6d5180c | 2453 | if (conn->ping_timeout && !conn->recv_timeout) { |
322d739d MC |
2454 | iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of " |
2455 | "zero. Using 5 seconds\n."); | |
f6d5180c MC |
2456 | conn->recv_timeout = 5; |
2457 | } | |
2458 | ||
2459 | if (conn->recv_timeout && !conn->ping_timeout) { | |
322d739d MC |
2460 | iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of " |
2461 | "zero. Using 5 seconds.\n"); | |
f6d5180c MC |
2462 | conn->ping_timeout = 5; |
2463 | } | |
2464 | ||
7996a778 MC |
2465 | spin_lock_bh(&session->lock); |
2466 | conn->c_stage = ISCSI_CONN_STARTED; | |
2467 | session->state = ISCSI_STATE_LOGGED_IN; | |
e0726407 | 2468 | session->queued_cmdsn = session->cmdsn; |
7996a778 | 2469 | |
f6d5180c MC |
2470 | conn->last_recv = jiffies; |
2471 | conn->last_ping = jiffies; | |
2472 | if (conn->recv_timeout && conn->ping_timeout) | |
2473 | mod_timer(&conn->transport_timer, | |
2474 | jiffies + (conn->recv_timeout * HZ)); | |
2475 | ||
7996a778 MC |
2476 | switch(conn->stop_stage) { |
2477 | case STOP_CONN_RECOVER: | |
2478 | /* | |
2479 | * unblock eh_abort() if it is blocked. re-try all | |
2480 | * commands after successful recovery | |
2481 | */ | |
7996a778 | 2482 | conn->stop_stage = 0; |
843c0a8a | 2483 | conn->tmf_state = TMF_INITIAL; |
7996a778 | 2484 | session->age++; |
8b1d0343 MC |
2485 | if (session->age == 16) |
2486 | session->age = 0; | |
6eabafbe | 2487 | break; |
7996a778 | 2488 | case STOP_CONN_TERM: |
7996a778 | 2489 | conn->stop_stage = 0; |
7996a778 MC |
2490 | break; |
2491 | default: | |
2492 | break; | |
2493 | } | |
2494 | spin_unlock_bh(&session->lock); | |
2495 | ||
75613521 | 2496 | iscsi_unblock_session(session->cls_session); |
6eabafbe | 2497 | wake_up(&conn->ehwait); |
7996a778 MC |
2498 | return 0; |
2499 | } | |
2500 | EXPORT_SYMBOL_GPL(iscsi_conn_start); | |
2501 | ||
2502 | static void | |
2503 | flush_control_queues(struct iscsi_session *session, struct iscsi_conn *conn) | |
2504 | { | |
9c19a7d0 | 2505 | struct iscsi_task *task, *tmp; |
7996a778 MC |
2506 | |
2507 | /* handle pending */ | |
9c19a7d0 | 2508 | list_for_each_entry_safe(task, tmp, &conn->mgmtqueue, running) { |
1b2c7af8 MC |
2509 | ISCSI_DBG_SESSION(session, "flushing pending mgmt task " |
2510 | "itt 0x%x\n", task->itt); | |
9c19a7d0 MC |
2511 | /* release ref from prep task */ |
2512 | __iscsi_put_task(task); | |
7996a778 MC |
2513 | } |
2514 | ||
2515 | /* handle running */ | |
9c19a7d0 | 2516 | list_for_each_entry_safe(task, tmp, &conn->mgmt_run_list, running) { |
1b2c7af8 MC |
2517 | ISCSI_DBG_SESSION(session, "flushing running mgmt task " |
2518 | "itt 0x%x\n", task->itt); | |
9c19a7d0 MC |
2519 | /* release ref from prep task */ |
2520 | __iscsi_put_task(task); | |
7996a778 MC |
2521 | } |
2522 | ||
9c19a7d0 | 2523 | conn->task = NULL; |
7996a778 MC |
2524 | } |
2525 | ||
656cffc9 MC |
2526 | static void iscsi_start_session_recovery(struct iscsi_session *session, |
2527 | struct iscsi_conn *conn, int flag) | |
7996a778 | 2528 | { |
ed2abc7f MC |
2529 | int old_stop_stage; |
2530 | ||
f6d5180c MC |
2531 | del_timer_sync(&conn->transport_timer); |
2532 | ||
6724add1 | 2533 | mutex_lock(&session->eh_mutex); |
7996a778 | 2534 | spin_lock_bh(&session->lock); |
ed2abc7f | 2535 | if (conn->stop_stage == STOP_CONN_TERM) { |
7996a778 | 2536 | spin_unlock_bh(&session->lock); |
6724add1 MC |
2537 | mutex_unlock(&session->eh_mutex); |
2538 | return; | |
2539 | } | |
2540 | ||
ed2abc7f MC |
2541 | /* |
2542 | * When this is called for the in_login state, we only want to clean | |
9c19a7d0 | 2543 | * up the login task and connection. We do not need to block and set |
67a61114 | 2544 | * the recovery state again |
ed2abc7f | 2545 | */ |
67a61114 MC |
2546 | if (flag == STOP_CONN_TERM) |
2547 | session->state = ISCSI_STATE_TERMINATE; | |
2548 | else if (conn->stop_stage != STOP_CONN_RECOVER) | |
2549 | session->state = ISCSI_STATE_IN_RECOVERY; | |
ed2abc7f MC |
2550 | |
2551 | old_stop_stage = conn->stop_stage; | |
7996a778 | 2552 | conn->stop_stage = flag; |
67a61114 | 2553 | conn->c_stage = ISCSI_CONN_STOPPED; |
7996a778 | 2554 | spin_unlock_bh(&session->lock); |
6724add1 MC |
2555 | |
2556 | iscsi_suspend_tx(conn); | |
7996a778 MC |
2557 | /* |
2558 | * for connection level recovery we should not calculate | |
2559 | * header digest. conn->hdr_size used for optimization | |
2560 | * in hdr_extract() and will be re-negotiated at | |
2561 | * set_param() time. | |
2562 | */ | |
2563 | if (flag == STOP_CONN_RECOVER) { | |
2564 | conn->hdrdgst_en = 0; | |
2565 | conn->datadgst_en = 0; | |
656cffc9 | 2566 | if (session->state == ISCSI_STATE_IN_RECOVERY && |
67a61114 | 2567 | old_stop_stage != STOP_CONN_RECOVER) { |
1b2c7af8 | 2568 | ISCSI_DBG_SESSION(session, "blocking session\n"); |
75613521 | 2569 | iscsi_block_session(session->cls_session); |
67a61114 | 2570 | } |
7996a778 | 2571 | } |
656cffc9 | 2572 | |
656cffc9 MC |
2573 | /* |
2574 | * flush queues. | |
2575 | */ | |
2576 | spin_lock_bh(&session->lock); | |
87cd9eab | 2577 | if (flag == STOP_CONN_RECOVER) |
56d7fcfa MC |
2578 | fail_all_commands(conn, -1, DID_TRANSPORT_DISRUPTED); |
2579 | else | |
2580 | fail_all_commands(conn, -1, DID_ERROR); | |
656cffc9 MC |
2581 | flush_control_queues(session, conn); |
2582 | spin_unlock_bh(&session->lock); | |
6724add1 | 2583 | mutex_unlock(&session->eh_mutex); |
7996a778 | 2584 | } |
7996a778 MC |
2585 | |
2586 | void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) | |
2587 | { | |
2588 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2589 | struct iscsi_session *session = conn->session; | |
2590 | ||
2591 | switch (flag) { | |
2592 | case STOP_CONN_RECOVER: | |
2593 | case STOP_CONN_TERM: | |
2594 | iscsi_start_session_recovery(session, conn, flag); | |
8d2860b3 | 2595 | break; |
7996a778 | 2596 | default: |
322d739d MC |
2597 | iscsi_conn_printk(KERN_ERR, conn, |
2598 | "invalid stop flag %d\n", flag); | |
7996a778 MC |
2599 | } |
2600 | } | |
2601 | EXPORT_SYMBOL_GPL(iscsi_conn_stop); | |
2602 | ||
2603 | int iscsi_conn_bind(struct iscsi_cls_session *cls_session, | |
2604 | struct iscsi_cls_conn *cls_conn, int is_leading) | |
2605 | { | |
75613521 | 2606 | struct iscsi_session *session = cls_session->dd_data; |
98644047 | 2607 | struct iscsi_conn *conn = cls_conn->dd_data; |
7996a778 | 2608 | |
7996a778 | 2609 | spin_lock_bh(&session->lock); |
7996a778 MC |
2610 | if (is_leading) |
2611 | session->leadconn = conn; | |
98644047 | 2612 | spin_unlock_bh(&session->lock); |
7996a778 MC |
2613 | |
2614 | /* | |
2615 | * Unblock xmitworker(), Login Phase will pass through. | |
2616 | */ | |
2617 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
2618 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
2619 | return 0; | |
2620 | } | |
2621 | EXPORT_SYMBOL_GPL(iscsi_conn_bind); | |
2622 | ||
a54a52ca MC |
2623 | |
2624 | int iscsi_set_param(struct iscsi_cls_conn *cls_conn, | |
2625 | enum iscsi_param param, char *buf, int buflen) | |
2626 | { | |
2627 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2628 | struct iscsi_session *session = conn->session; | |
2629 | uint32_t value; | |
2630 | ||
2631 | switch(param) { | |
843c0a8a MC |
2632 | case ISCSI_PARAM_FAST_ABORT: |
2633 | sscanf(buf, "%d", &session->fast_abort); | |
2634 | break; | |
f6d5180c MC |
2635 | case ISCSI_PARAM_ABORT_TMO: |
2636 | sscanf(buf, "%d", &session->abort_timeout); | |
2637 | break; | |
2638 | case ISCSI_PARAM_LU_RESET_TMO: | |
2639 | sscanf(buf, "%d", &session->lu_reset_timeout); | |
2640 | break; | |
2641 | case ISCSI_PARAM_PING_TMO: | |
2642 | sscanf(buf, "%d", &conn->ping_timeout); | |
2643 | break; | |
2644 | case ISCSI_PARAM_RECV_TMO: | |
2645 | sscanf(buf, "%d", &conn->recv_timeout); | |
2646 | break; | |
a54a52ca MC |
2647 | case ISCSI_PARAM_MAX_RECV_DLENGTH: |
2648 | sscanf(buf, "%d", &conn->max_recv_dlength); | |
2649 | break; | |
2650 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
2651 | sscanf(buf, "%d", &conn->max_xmit_dlength); | |
2652 | break; | |
2653 | case ISCSI_PARAM_HDRDGST_EN: | |
2654 | sscanf(buf, "%d", &conn->hdrdgst_en); | |
2655 | break; | |
2656 | case ISCSI_PARAM_DATADGST_EN: | |
2657 | sscanf(buf, "%d", &conn->datadgst_en); | |
2658 | break; | |
2659 | case ISCSI_PARAM_INITIAL_R2T_EN: | |
2660 | sscanf(buf, "%d", &session->initial_r2t_en); | |
2661 | break; | |
2662 | case ISCSI_PARAM_MAX_R2T: | |
2663 | sscanf(buf, "%d", &session->max_r2t); | |
2664 | break; | |
2665 | case ISCSI_PARAM_IMM_DATA_EN: | |
2666 | sscanf(buf, "%d", &session->imm_data_en); | |
2667 | break; | |
2668 | case ISCSI_PARAM_FIRST_BURST: | |
2669 | sscanf(buf, "%d", &session->first_burst); | |
2670 | break; | |
2671 | case ISCSI_PARAM_MAX_BURST: | |
2672 | sscanf(buf, "%d", &session->max_burst); | |
2673 | break; | |
2674 | case ISCSI_PARAM_PDU_INORDER_EN: | |
2675 | sscanf(buf, "%d", &session->pdu_inorder_en); | |
2676 | break; | |
2677 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
2678 | sscanf(buf, "%d", &session->dataseq_inorder_en); | |
2679 | break; | |
2680 | case ISCSI_PARAM_ERL: | |
2681 | sscanf(buf, "%d", &session->erl); | |
2682 | break; | |
2683 | case ISCSI_PARAM_IFMARKER_EN: | |
2684 | sscanf(buf, "%d", &value); | |
2685 | BUG_ON(value); | |
2686 | break; | |
2687 | case ISCSI_PARAM_OFMARKER_EN: | |
2688 | sscanf(buf, "%d", &value); | |
2689 | BUG_ON(value); | |
2690 | break; | |
2691 | case ISCSI_PARAM_EXP_STATSN: | |
2692 | sscanf(buf, "%u", &conn->exp_statsn); | |
2693 | break; | |
b2c64167 MC |
2694 | case ISCSI_PARAM_USERNAME: |
2695 | kfree(session->username); | |
2696 | session->username = kstrdup(buf, GFP_KERNEL); | |
2697 | if (!session->username) | |
2698 | return -ENOMEM; | |
2699 | break; | |
2700 | case ISCSI_PARAM_USERNAME_IN: | |
2701 | kfree(session->username_in); | |
2702 | session->username_in = kstrdup(buf, GFP_KERNEL); | |
2703 | if (!session->username_in) | |
2704 | return -ENOMEM; | |
2705 | break; | |
2706 | case ISCSI_PARAM_PASSWORD: | |
2707 | kfree(session->password); | |
2708 | session->password = kstrdup(buf, GFP_KERNEL); | |
2709 | if (!session->password) | |
2710 | return -ENOMEM; | |
2711 | break; | |
2712 | case ISCSI_PARAM_PASSWORD_IN: | |
2713 | kfree(session->password_in); | |
2714 | session->password_in = kstrdup(buf, GFP_KERNEL); | |
2715 | if (!session->password_in) | |
2716 | return -ENOMEM; | |
2717 | break; | |
a54a52ca MC |
2718 | case ISCSI_PARAM_TARGET_NAME: |
2719 | /* this should not change between logins */ | |
2720 | if (session->targetname) | |
2721 | break; | |
2722 | ||
2723 | session->targetname = kstrdup(buf, GFP_KERNEL); | |
2724 | if (!session->targetname) | |
2725 | return -ENOMEM; | |
2726 | break; | |
2727 | case ISCSI_PARAM_TPGT: | |
2728 | sscanf(buf, "%d", &session->tpgt); | |
2729 | break; | |
2730 | case ISCSI_PARAM_PERSISTENT_PORT: | |
2731 | sscanf(buf, "%d", &conn->persistent_port); | |
2732 | break; | |
2733 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
2734 | /* | |
2735 | * this is the address returned in discovery so it should | |
2736 | * not change between logins. | |
2737 | */ | |
2738 | if (conn->persistent_address) | |
2739 | break; | |
2740 | ||
2741 | conn->persistent_address = kstrdup(buf, GFP_KERNEL); | |
2742 | if (!conn->persistent_address) | |
2743 | return -ENOMEM; | |
2744 | break; | |
88dfd340 MC |
2745 | case ISCSI_PARAM_IFACE_NAME: |
2746 | if (!session->ifacename) | |
2747 | session->ifacename = kstrdup(buf, GFP_KERNEL); | |
2748 | break; | |
2749 | case ISCSI_PARAM_INITIATOR_NAME: | |
2750 | if (!session->initiatorname) | |
2751 | session->initiatorname = kstrdup(buf, GFP_KERNEL); | |
2752 | break; | |
a54a52ca MC |
2753 | default: |
2754 | return -ENOSYS; | |
2755 | } | |
2756 | ||
2757 | return 0; | |
2758 | } | |
2759 | EXPORT_SYMBOL_GPL(iscsi_set_param); | |
2760 | ||
2761 | int iscsi_session_get_param(struct iscsi_cls_session *cls_session, | |
2762 | enum iscsi_param param, char *buf) | |
2763 | { | |
75613521 | 2764 | struct iscsi_session *session = cls_session->dd_data; |
a54a52ca MC |
2765 | int len; |
2766 | ||
2767 | switch(param) { | |
843c0a8a MC |
2768 | case ISCSI_PARAM_FAST_ABORT: |
2769 | len = sprintf(buf, "%d\n", session->fast_abort); | |
2770 | break; | |
f6d5180c MC |
2771 | case ISCSI_PARAM_ABORT_TMO: |
2772 | len = sprintf(buf, "%d\n", session->abort_timeout); | |
2773 | break; | |
2774 | case ISCSI_PARAM_LU_RESET_TMO: | |
2775 | len = sprintf(buf, "%d\n", session->lu_reset_timeout); | |
2776 | break; | |
a54a52ca MC |
2777 | case ISCSI_PARAM_INITIAL_R2T_EN: |
2778 | len = sprintf(buf, "%d\n", session->initial_r2t_en); | |
2779 | break; | |
2780 | case ISCSI_PARAM_MAX_R2T: | |
2781 | len = sprintf(buf, "%hu\n", session->max_r2t); | |
2782 | break; | |
2783 | case ISCSI_PARAM_IMM_DATA_EN: | |
2784 | len = sprintf(buf, "%d\n", session->imm_data_en); | |
2785 | break; | |
2786 | case ISCSI_PARAM_FIRST_BURST: | |
2787 | len = sprintf(buf, "%u\n", session->first_burst); | |
2788 | break; | |
2789 | case ISCSI_PARAM_MAX_BURST: | |
2790 | len = sprintf(buf, "%u\n", session->max_burst); | |
2791 | break; | |
2792 | case ISCSI_PARAM_PDU_INORDER_EN: | |
2793 | len = sprintf(buf, "%d\n", session->pdu_inorder_en); | |
2794 | break; | |
2795 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
2796 | len = sprintf(buf, "%d\n", session->dataseq_inorder_en); | |
2797 | break; | |
2798 | case ISCSI_PARAM_ERL: | |
2799 | len = sprintf(buf, "%d\n", session->erl); | |
2800 | break; | |
2801 | case ISCSI_PARAM_TARGET_NAME: | |
2802 | len = sprintf(buf, "%s\n", session->targetname); | |
2803 | break; | |
2804 | case ISCSI_PARAM_TPGT: | |
2805 | len = sprintf(buf, "%d\n", session->tpgt); | |
2806 | break; | |
b2c64167 MC |
2807 | case ISCSI_PARAM_USERNAME: |
2808 | len = sprintf(buf, "%s\n", session->username); | |
2809 | break; | |
2810 | case ISCSI_PARAM_USERNAME_IN: | |
2811 | len = sprintf(buf, "%s\n", session->username_in); | |
2812 | break; | |
2813 | case ISCSI_PARAM_PASSWORD: | |
2814 | len = sprintf(buf, "%s\n", session->password); | |
2815 | break; | |
2816 | case ISCSI_PARAM_PASSWORD_IN: | |
2817 | len = sprintf(buf, "%s\n", session->password_in); | |
2818 | break; | |
88dfd340 MC |
2819 | case ISCSI_PARAM_IFACE_NAME: |
2820 | len = sprintf(buf, "%s\n", session->ifacename); | |
2821 | break; | |
2822 | case ISCSI_PARAM_INITIATOR_NAME: | |
2823 | if (!session->initiatorname) | |
2824 | len = sprintf(buf, "%s\n", "unknown"); | |
2825 | else | |
2826 | len = sprintf(buf, "%s\n", session->initiatorname); | |
2827 | break; | |
a54a52ca MC |
2828 | default: |
2829 | return -ENOSYS; | |
2830 | } | |
2831 | ||
2832 | return len; | |
2833 | } | |
2834 | EXPORT_SYMBOL_GPL(iscsi_session_get_param); | |
2835 | ||
2836 | int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn, | |
2837 | enum iscsi_param param, char *buf) | |
2838 | { | |
2839 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2840 | int len; | |
2841 | ||
2842 | switch(param) { | |
f6d5180c MC |
2843 | case ISCSI_PARAM_PING_TMO: |
2844 | len = sprintf(buf, "%u\n", conn->ping_timeout); | |
2845 | break; | |
2846 | case ISCSI_PARAM_RECV_TMO: | |
2847 | len = sprintf(buf, "%u\n", conn->recv_timeout); | |
2848 | break; | |
a54a52ca MC |
2849 | case ISCSI_PARAM_MAX_RECV_DLENGTH: |
2850 | len = sprintf(buf, "%u\n", conn->max_recv_dlength); | |
2851 | break; | |
2852 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
2853 | len = sprintf(buf, "%u\n", conn->max_xmit_dlength); | |
2854 | break; | |
2855 | case ISCSI_PARAM_HDRDGST_EN: | |
2856 | len = sprintf(buf, "%d\n", conn->hdrdgst_en); | |
2857 | break; | |
2858 | case ISCSI_PARAM_DATADGST_EN: | |
2859 | len = sprintf(buf, "%d\n", conn->datadgst_en); | |
2860 | break; | |
2861 | case ISCSI_PARAM_IFMARKER_EN: | |
2862 | len = sprintf(buf, "%d\n", conn->ifmarker_en); | |
2863 | break; | |
2864 | case ISCSI_PARAM_OFMARKER_EN: | |
2865 | len = sprintf(buf, "%d\n", conn->ofmarker_en); | |
2866 | break; | |
2867 | case ISCSI_PARAM_EXP_STATSN: | |
2868 | len = sprintf(buf, "%u\n", conn->exp_statsn); | |
2869 | break; | |
2870 | case ISCSI_PARAM_PERSISTENT_PORT: | |
2871 | len = sprintf(buf, "%d\n", conn->persistent_port); | |
2872 | break; | |
2873 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
2874 | len = sprintf(buf, "%s\n", conn->persistent_address); | |
2875 | break; | |
2876 | default: | |
2877 | return -ENOSYS; | |
2878 | } | |
2879 | ||
2880 | return len; | |
2881 | } | |
2882 | EXPORT_SYMBOL_GPL(iscsi_conn_get_param); | |
2883 | ||
0801c242 MC |
2884 | int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param, |
2885 | char *buf) | |
2886 | { | |
75613521 | 2887 | struct iscsi_host *ihost = shost_priv(shost); |
0801c242 MC |
2888 | int len; |
2889 | ||
2890 | switch (param) { | |
d8196ed2 | 2891 | case ISCSI_HOST_PARAM_NETDEV_NAME: |
75613521 | 2892 | if (!ihost->netdev) |
d8196ed2 MC |
2893 | len = sprintf(buf, "%s\n", "default"); |
2894 | else | |
75613521 | 2895 | len = sprintf(buf, "%s\n", ihost->netdev); |
d8196ed2 | 2896 | break; |
0801c242 | 2897 | case ISCSI_HOST_PARAM_HWADDRESS: |
75613521 | 2898 | if (!ihost->hwaddress) |
0801c242 MC |
2899 | len = sprintf(buf, "%s\n", "default"); |
2900 | else | |
75613521 | 2901 | len = sprintf(buf, "%s\n", ihost->hwaddress); |
0801c242 | 2902 | break; |
8ad5781a | 2903 | case ISCSI_HOST_PARAM_INITIATOR_NAME: |
75613521 | 2904 | if (!ihost->initiatorname) |
8ad5781a MC |
2905 | len = sprintf(buf, "%s\n", "unknown"); |
2906 | else | |
75613521 | 2907 | len = sprintf(buf, "%s\n", ihost->initiatorname); |
8ad5781a | 2908 | break; |
75613521 MC |
2909 | case ISCSI_HOST_PARAM_IPADDRESS: |
2910 | if (!strlen(ihost->local_address)) | |
2911 | len = sprintf(buf, "%s\n", "unknown"); | |
2912 | else | |
2913 | len = sprintf(buf, "%s\n", | |
2914 | ihost->local_address); | |
88dfd340 | 2915 | break; |
0801c242 MC |
2916 | default: |
2917 | return -ENOSYS; | |
2918 | } | |
2919 | ||
2920 | return len; | |
2921 | } | |
2922 | EXPORT_SYMBOL_GPL(iscsi_host_get_param); | |
2923 | ||
2924 | int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param, | |
2925 | char *buf, int buflen) | |
2926 | { | |
75613521 | 2927 | struct iscsi_host *ihost = shost_priv(shost); |
0801c242 MC |
2928 | |
2929 | switch (param) { | |
d8196ed2 | 2930 | case ISCSI_HOST_PARAM_NETDEV_NAME: |
75613521 MC |
2931 | if (!ihost->netdev) |
2932 | ihost->netdev = kstrdup(buf, GFP_KERNEL); | |
d8196ed2 | 2933 | break; |
0801c242 | 2934 | case ISCSI_HOST_PARAM_HWADDRESS: |
75613521 MC |
2935 | if (!ihost->hwaddress) |
2936 | ihost->hwaddress = kstrdup(buf, GFP_KERNEL); | |
0801c242 | 2937 | break; |
8ad5781a | 2938 | case ISCSI_HOST_PARAM_INITIATOR_NAME: |
75613521 MC |
2939 | if (!ihost->initiatorname) |
2940 | ihost->initiatorname = kstrdup(buf, GFP_KERNEL); | |
8ad5781a | 2941 | break; |
0801c242 MC |
2942 | default: |
2943 | return -ENOSYS; | |
2944 | } | |
2945 | ||
2946 | return 0; | |
2947 | } | |
2948 | EXPORT_SYMBOL_GPL(iscsi_host_set_param); | |
2949 | ||
7996a778 MC |
2950 | MODULE_AUTHOR("Mike Christie"); |
2951 | MODULE_DESCRIPTION("iSCSI library functions"); | |
2952 | MODULE_LICENSE("GPL"); |