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7996a778 MC |
1 | /* |
2 | * iSCSI lib functions | |
3 | * | |
4 | * Copyright (C) 2006 Red Hat, Inc. All rights reserved. | |
5 | * Copyright (C) 2004 - 2006 Mike Christie | |
6 | * Copyright (C) 2004 - 2005 Dmitry Yusupov | |
7 | * Copyright (C) 2004 - 2005 Alex Aizman | |
8 | * maintained by open-iscsi@googlegroups.com | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
23 | */ | |
24 | #include <linux/types.h> | |
7996a778 MC |
25 | #include <linux/kfifo.h> |
26 | #include <linux/delay.h> | |
11836572 | 27 | #include <linux/log2.h> |
8eb00539 | 28 | #include <asm/unaligned.h> |
7996a778 MC |
29 | #include <net/tcp.h> |
30 | #include <scsi/scsi_cmnd.h> | |
31 | #include <scsi/scsi_device.h> | |
32 | #include <scsi/scsi_eh.h> | |
33 | #include <scsi/scsi_tcq.h> | |
34 | #include <scsi/scsi_host.h> | |
35 | #include <scsi/scsi.h> | |
36 | #include <scsi/iscsi_proto.h> | |
37 | #include <scsi/scsi_transport.h> | |
38 | #include <scsi/scsi_transport_iscsi.h> | |
39 | #include <scsi/libiscsi.h> | |
40 | ||
1b2c7af8 MC |
41 | static int iscsi_dbg_lib; |
42 | module_param_named(debug_libiscsi, iscsi_dbg_lib, int, S_IRUGO | S_IWUSR); | |
43 | MODULE_PARM_DESC(debug_libiscsi, "Turn on debugging for libiscsi module. " | |
44 | "Set to 1 to turn on, and zero to turn off. Default " | |
45 | "is off."); | |
46 | ||
47 | #define ISCSI_DBG_CONN(_conn, dbg_fmt, arg...) \ | |
48 | do { \ | |
49 | if (iscsi_dbg_lib) \ | |
50 | iscsi_conn_printk(KERN_INFO, _conn, \ | |
51 | "%s " dbg_fmt, \ | |
52 | __func__, ##arg); \ | |
53 | } while (0); | |
54 | ||
55 | #define ISCSI_DBG_SESSION(_session, dbg_fmt, arg...) \ | |
56 | do { \ | |
57 | if (iscsi_dbg_lib) \ | |
58 | iscsi_session_printk(KERN_INFO, _session, \ | |
59 | "%s " dbg_fmt, \ | |
60 | __func__, ##arg); \ | |
61 | } while (0); | |
62 | ||
77a23c21 MC |
63 | /* Serial Number Arithmetic, 32 bits, less than, RFC1982 */ |
64 | #define SNA32_CHECK 2147483648UL | |
7996a778 | 65 | |
77a23c21 MC |
66 | static int iscsi_sna_lt(u32 n1, u32 n2) |
67 | { | |
68 | return n1 != n2 && ((n1 < n2 && (n2 - n1 < SNA32_CHECK)) || | |
69 | (n1 > n2 && (n2 - n1 < SNA32_CHECK))); | |
70 | } | |
71 | ||
72 | /* Serial Number Arithmetic, 32 bits, less than, RFC1982 */ | |
73 | static int iscsi_sna_lte(u32 n1, u32 n2) | |
74 | { | |
75 | return n1 == n2 || ((n1 < n2 && (n2 - n1 < SNA32_CHECK)) || | |
76 | (n1 > n2 && (n2 - n1 < SNA32_CHECK))); | |
77 | } | |
78 | ||
32ae763e MC |
79 | inline void iscsi_conn_queue_work(struct iscsi_conn *conn) |
80 | { | |
81 | struct Scsi_Host *shost = conn->session->host; | |
82 | struct iscsi_host *ihost = shost_priv(shost); | |
83 | ||
84 | queue_work(ihost->workq, &conn->xmitwork); | |
85 | } | |
86 | EXPORT_SYMBOL_GPL(iscsi_conn_queue_work); | |
87 | ||
77a23c21 MC |
88 | void |
89 | iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr) | |
7996a778 MC |
90 | { |
91 | uint32_t max_cmdsn = be32_to_cpu(hdr->max_cmdsn); | |
92 | uint32_t exp_cmdsn = be32_to_cpu(hdr->exp_cmdsn); | |
93 | ||
77a23c21 MC |
94 | /* |
95 | * standard specifies this check for when to update expected and | |
96 | * max sequence numbers | |
97 | */ | |
98 | if (iscsi_sna_lt(max_cmdsn, exp_cmdsn - 1)) | |
99 | return; | |
100 | ||
101 | if (exp_cmdsn != session->exp_cmdsn && | |
102 | !iscsi_sna_lt(exp_cmdsn, session->exp_cmdsn)) | |
7996a778 MC |
103 | session->exp_cmdsn = exp_cmdsn; |
104 | ||
77a23c21 MC |
105 | if (max_cmdsn != session->max_cmdsn && |
106 | !iscsi_sna_lt(max_cmdsn, session->max_cmdsn)) { | |
107 | session->max_cmdsn = max_cmdsn; | |
108 | /* | |
109 | * if the window closed with IO queued, then kick the | |
110 | * xmit thread | |
111 | */ | |
112 | if (!list_empty(&session->leadconn->xmitqueue) || | |
052d0144 MC |
113 | !list_empty(&session->leadconn->mgmtqueue)) { |
114 | if (!(session->tt->caps & CAP_DATA_PATH_OFFLOAD)) | |
32ae763e | 115 | iscsi_conn_queue_work(session->leadconn); |
052d0144 | 116 | } |
77a23c21 | 117 | } |
7996a778 | 118 | } |
77a23c21 | 119 | EXPORT_SYMBOL_GPL(iscsi_update_cmdsn); |
7996a778 | 120 | |
577577da MC |
121 | /** |
122 | * iscsi_prep_data_out_pdu - initialize Data-Out | |
123 | * @task: scsi command task | |
124 | * @r2t: R2T info | |
125 | * @hdr: iscsi data in pdu | |
126 | * | |
127 | * Notes: | |
128 | * Initialize Data-Out within this R2T sequence and finds | |
129 | * proper data_offset within this SCSI command. | |
130 | * | |
131 | * This function is called with connection lock taken. | |
132 | **/ | |
133 | void iscsi_prep_data_out_pdu(struct iscsi_task *task, struct iscsi_r2t_info *r2t, | |
134 | struct iscsi_data *hdr) | |
7996a778 | 135 | { |
9c19a7d0 | 136 | struct iscsi_conn *conn = task->conn; |
577577da MC |
137 | unsigned int left = r2t->data_length - r2t->sent; |
138 | ||
139 | task->hdr_len = sizeof(struct iscsi_data); | |
7996a778 MC |
140 | |
141 | memset(hdr, 0, sizeof(struct iscsi_data)); | |
577577da MC |
142 | hdr->ttt = r2t->ttt; |
143 | hdr->datasn = cpu_to_be32(r2t->datasn); | |
144 | r2t->datasn++; | |
7996a778 | 145 | hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; |
577577da MC |
146 | memcpy(hdr->lun, task->lun, sizeof(hdr->lun)); |
147 | hdr->itt = task->hdr_itt; | |
148 | hdr->exp_statsn = r2t->exp_statsn; | |
149 | hdr->offset = cpu_to_be32(r2t->data_offset + r2t->sent); | |
150 | if (left > conn->max_xmit_dlength) { | |
7996a778 | 151 | hton24(hdr->dlength, conn->max_xmit_dlength); |
577577da | 152 | r2t->data_count = conn->max_xmit_dlength; |
7996a778 MC |
153 | hdr->flags = 0; |
154 | } else { | |
577577da MC |
155 | hton24(hdr->dlength, left); |
156 | r2t->data_count = left; | |
7996a778 MC |
157 | hdr->flags = ISCSI_FLAG_CMD_FINAL; |
158 | } | |
577577da | 159 | conn->dataout_pdus_cnt++; |
7996a778 | 160 | } |
577577da | 161 | EXPORT_SYMBOL_GPL(iscsi_prep_data_out_pdu); |
7996a778 | 162 | |
9c19a7d0 | 163 | static int iscsi_add_hdr(struct iscsi_task *task, unsigned len) |
004d6530 | 164 | { |
9c19a7d0 | 165 | unsigned exp_len = task->hdr_len + len; |
004d6530 | 166 | |
9c19a7d0 | 167 | if (exp_len > task->hdr_max) { |
004d6530 BH |
168 | WARN_ON(1); |
169 | return -EINVAL; | |
170 | } | |
171 | ||
172 | WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */ | |
9c19a7d0 | 173 | task->hdr_len = exp_len; |
004d6530 BH |
174 | return 0; |
175 | } | |
176 | ||
38d1c069 BH |
177 | /* |
178 | * make an extended cdb AHS | |
179 | */ | |
9c19a7d0 | 180 | static int iscsi_prep_ecdb_ahs(struct iscsi_task *task) |
38d1c069 | 181 | { |
9c19a7d0 | 182 | struct scsi_cmnd *cmd = task->sc; |
38d1c069 BH |
183 | unsigned rlen, pad_len; |
184 | unsigned short ahslength; | |
185 | struct iscsi_ecdb_ahdr *ecdb_ahdr; | |
186 | int rc; | |
187 | ||
9c19a7d0 | 188 | ecdb_ahdr = iscsi_next_hdr(task); |
38d1c069 BH |
189 | rlen = cmd->cmd_len - ISCSI_CDB_SIZE; |
190 | ||
191 | BUG_ON(rlen > sizeof(ecdb_ahdr->ecdb)); | |
192 | ahslength = rlen + sizeof(ecdb_ahdr->reserved); | |
193 | ||
194 | pad_len = iscsi_padding(rlen); | |
195 | ||
9c19a7d0 | 196 | rc = iscsi_add_hdr(task, sizeof(ecdb_ahdr->ahslength) + |
38d1c069 BH |
197 | sizeof(ecdb_ahdr->ahstype) + ahslength + pad_len); |
198 | if (rc) | |
199 | return rc; | |
200 | ||
201 | if (pad_len) | |
202 | memset(&ecdb_ahdr->ecdb[rlen], 0, pad_len); | |
203 | ||
204 | ecdb_ahdr->ahslength = cpu_to_be16(ahslength); | |
205 | ecdb_ahdr->ahstype = ISCSI_AHSTYPE_CDB; | |
206 | ecdb_ahdr->reserved = 0; | |
207 | memcpy(ecdb_ahdr->ecdb, cmd->cmnd + ISCSI_CDB_SIZE, rlen); | |
208 | ||
1b2c7af8 MC |
209 | ISCSI_DBG_SESSION(task->conn->session, |
210 | "iscsi_prep_ecdb_ahs: varlen_cdb_len %d " | |
211 | "rlen %d pad_len %d ahs_length %d iscsi_headers_size " | |
212 | "%u\n", cmd->cmd_len, rlen, pad_len, ahslength, | |
213 | task->hdr_len); | |
38d1c069 BH |
214 | return 0; |
215 | } | |
216 | ||
9c19a7d0 | 217 | static int iscsi_prep_bidi_ahs(struct iscsi_task *task) |
c07d4444 | 218 | { |
9c19a7d0 | 219 | struct scsi_cmnd *sc = task->sc; |
c07d4444 BH |
220 | struct iscsi_rlength_ahdr *rlen_ahdr; |
221 | int rc; | |
222 | ||
9c19a7d0 MC |
223 | rlen_ahdr = iscsi_next_hdr(task); |
224 | rc = iscsi_add_hdr(task, sizeof(*rlen_ahdr)); | |
c07d4444 BH |
225 | if (rc) |
226 | return rc; | |
227 | ||
228 | rlen_ahdr->ahslength = | |
229 | cpu_to_be16(sizeof(rlen_ahdr->read_length) + | |
230 | sizeof(rlen_ahdr->reserved)); | |
231 | rlen_ahdr->ahstype = ISCSI_AHSTYPE_RLENGTH; | |
232 | rlen_ahdr->reserved = 0; | |
233 | rlen_ahdr->read_length = cpu_to_be32(scsi_in(sc)->length); | |
234 | ||
1b2c7af8 MC |
235 | ISCSI_DBG_SESSION(task->conn->session, |
236 | "bidi-in rlen_ahdr->read_length(%d) " | |
237 | "rlen_ahdr->ahslength(%d)\n", | |
238 | be32_to_cpu(rlen_ahdr->read_length), | |
239 | be16_to_cpu(rlen_ahdr->ahslength)); | |
c07d4444 BH |
240 | return 0; |
241 | } | |
242 | ||
7996a778 MC |
243 | /** |
244 | * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu | |
9c19a7d0 | 245 | * @task: iscsi task |
7996a778 MC |
246 | * |
247 | * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set | |
248 | * fields like dlength or final based on how much data it sends | |
249 | */ | |
9c19a7d0 | 250 | static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task) |
7996a778 | 251 | { |
9c19a7d0 | 252 | struct iscsi_conn *conn = task->conn; |
7996a778 | 253 | struct iscsi_session *session = conn->session; |
9c19a7d0 | 254 | struct scsi_cmnd *sc = task->sc; |
577577da | 255 | struct iscsi_cmd *hdr; |
38d1c069 | 256 | unsigned hdrlength, cmd_len; |
262ef636 | 257 | itt_t itt; |
004d6530 | 258 | int rc; |
7996a778 | 259 | |
2ff79d52 | 260 | rc = conn->session->tt->alloc_pdu(task, ISCSI_OP_SCSI_CMD); |
577577da MC |
261 | if (rc) |
262 | return rc; | |
263 | hdr = (struct iscsi_cmd *) task->hdr; | |
262ef636 | 264 | itt = hdr->itt; |
577577da MC |
265 | memset(hdr, 0, sizeof(*hdr)); |
266 | ||
2ff79d52 MC |
267 | if (session->tt->parse_pdu_itt) |
268 | hdr->itt = task->hdr_itt = itt; | |
269 | else | |
270 | hdr->itt = task->hdr_itt = build_itt(task->itt, | |
271 | task->conn->session->age); | |
9c19a7d0 MC |
272 | task->hdr_len = 0; |
273 | rc = iscsi_add_hdr(task, sizeof(*hdr)); | |
004d6530 BH |
274 | if (rc) |
275 | return rc; | |
a8ac6311 OK |
276 | hdr->opcode = ISCSI_OP_SCSI_CMD; |
277 | hdr->flags = ISCSI_ATTR_SIMPLE; | |
278 | int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun); | |
577577da | 279 | memcpy(task->lun, hdr->lun, sizeof(task->lun)); |
577577da | 280 | hdr->cmdsn = task->cmdsn = cpu_to_be32(session->cmdsn); |
a8ac6311 OK |
281 | session->cmdsn++; |
282 | hdr->exp_statsn = cpu_to_be32(conn->exp_statsn); | |
38d1c069 BH |
283 | cmd_len = sc->cmd_len; |
284 | if (cmd_len < ISCSI_CDB_SIZE) | |
285 | memset(&hdr->cdb[cmd_len], 0, ISCSI_CDB_SIZE - cmd_len); | |
286 | else if (cmd_len > ISCSI_CDB_SIZE) { | |
9c19a7d0 | 287 | rc = iscsi_prep_ecdb_ahs(task); |
38d1c069 BH |
288 | if (rc) |
289 | return rc; | |
290 | cmd_len = ISCSI_CDB_SIZE; | |
291 | } | |
292 | memcpy(hdr->cdb, sc->cmnd, cmd_len); | |
7996a778 | 293 | |
9c19a7d0 | 294 | task->imm_count = 0; |
c07d4444 BH |
295 | if (scsi_bidi_cmnd(sc)) { |
296 | hdr->flags |= ISCSI_FLAG_CMD_READ; | |
9c19a7d0 | 297 | rc = iscsi_prep_bidi_ahs(task); |
c07d4444 BH |
298 | if (rc) |
299 | return rc; | |
300 | } | |
7996a778 | 301 | if (sc->sc_data_direction == DMA_TO_DEVICE) { |
c07d4444 | 302 | unsigned out_len = scsi_out(sc)->length; |
577577da MC |
303 | struct iscsi_r2t_info *r2t = &task->unsol_r2t; |
304 | ||
c07d4444 | 305 | hdr->data_length = cpu_to_be32(out_len); |
7996a778 MC |
306 | hdr->flags |= ISCSI_FLAG_CMD_WRITE; |
307 | /* | |
308 | * Write counters: | |
309 | * | |
310 | * imm_count bytes to be sent right after | |
311 | * SCSI PDU Header | |
312 | * | |
313 | * unsol_count bytes(as Data-Out) to be sent | |
314 | * without R2T ack right after | |
315 | * immediate data | |
316 | * | |
577577da | 317 | * r2t data_length bytes to be sent via R2T ack's |
7996a778 MC |
318 | * |
319 | * pad_count bytes to be sent as zero-padding | |
320 | */ | |
577577da | 321 | memset(r2t, 0, sizeof(*r2t)); |
7996a778 MC |
322 | |
323 | if (session->imm_data_en) { | |
c07d4444 | 324 | if (out_len >= session->first_burst) |
9c19a7d0 | 325 | task->imm_count = min(session->first_burst, |
7996a778 MC |
326 | conn->max_xmit_dlength); |
327 | else | |
9c19a7d0 | 328 | task->imm_count = min(out_len, |
7996a778 | 329 | conn->max_xmit_dlength); |
9c19a7d0 | 330 | hton24(hdr->dlength, task->imm_count); |
7996a778 | 331 | } else |
a8ac6311 | 332 | zero_data(hdr->dlength); |
7996a778 | 333 | |
ffd0436e | 334 | if (!session->initial_r2t_en) { |
577577da MC |
335 | r2t->data_length = min(session->first_burst, out_len) - |
336 | task->imm_count; | |
337 | r2t->data_offset = task->imm_count; | |
338 | r2t->ttt = cpu_to_be32(ISCSI_RESERVED_TAG); | |
339 | r2t->exp_statsn = cpu_to_be32(conn->exp_statsn); | |
ffd0436e MC |
340 | } |
341 | ||
577577da | 342 | if (!task->unsol_r2t.data_length) |
7996a778 | 343 | /* No unsolicit Data-Out's */ |
a8ac6311 | 344 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; |
7996a778 | 345 | } else { |
7996a778 MC |
346 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; |
347 | zero_data(hdr->dlength); | |
c07d4444 | 348 | hdr->data_length = cpu_to_be32(scsi_in(sc)->length); |
7996a778 MC |
349 | |
350 | if (sc->sc_data_direction == DMA_FROM_DEVICE) | |
351 | hdr->flags |= ISCSI_FLAG_CMD_READ; | |
352 | } | |
353 | ||
004d6530 | 354 | /* calculate size of additional header segments (AHSs) */ |
9c19a7d0 | 355 | hdrlength = task->hdr_len - sizeof(*hdr); |
004d6530 BH |
356 | |
357 | WARN_ON(hdrlength & (ISCSI_PAD_LEN-1)); | |
358 | hdrlength /= ISCSI_PAD_LEN; | |
359 | ||
360 | WARN_ON(hdrlength >= 256); | |
361 | hdr->hlength = hdrlength & 0xFF; | |
362 | ||
577577da | 363 | if (session->tt->init_task && session->tt->init_task(task)) |
052d0144 MC |
364 | return -EIO; |
365 | ||
9c19a7d0 MC |
366 | task->state = ISCSI_TASK_RUNNING; |
367 | list_move_tail(&task->running, &conn->run_list); | |
77a23c21 | 368 | |
a8ac6311 | 369 | conn->scsicmd_pdus_cnt++; |
1b2c7af8 MC |
370 | ISCSI_DBG_SESSION(session, "iscsi prep [%s cid %d sc %p cdb 0x%x " |
371 | "itt 0x%x len %d bidi_len %d cmdsn %d win %d]\n", | |
372 | scsi_bidi_cmnd(sc) ? "bidirectional" : | |
373 | sc->sc_data_direction == DMA_TO_DEVICE ? | |
374 | "write" : "read", conn->id, sc, sc->cmnd[0], | |
375 | task->itt, scsi_bufflen(sc), | |
376 | scsi_bidi_cmnd(sc) ? scsi_in(sc)->length : 0, | |
377 | session->cmdsn, | |
378 | session->max_cmdsn - session->exp_cmdsn + 1); | |
004d6530 | 379 | return 0; |
7996a778 | 380 | } |
7996a778 MC |
381 | |
382 | /** | |
3e5c28ad | 383 | * iscsi_complete_command - finish a task |
9c19a7d0 | 384 | * @task: iscsi cmd task |
7996a778 MC |
385 | * |
386 | * Must be called with session lock. | |
3e5c28ad MC |
387 | * This function returns the scsi command to scsi-ml or cleans |
388 | * up mgmt tasks then returns the task to the pool. | |
7996a778 | 389 | */ |
9c19a7d0 | 390 | static void iscsi_complete_command(struct iscsi_task *task) |
7996a778 | 391 | { |
9c19a7d0 | 392 | struct iscsi_conn *conn = task->conn; |
c1635cb7 | 393 | struct iscsi_session *session = conn->session; |
9c19a7d0 | 394 | struct scsi_cmnd *sc = task->sc; |
7996a778 | 395 | |
577577da | 396 | session->tt->cleanup_task(task); |
9c19a7d0 MC |
397 | list_del_init(&task->running); |
398 | task->state = ISCSI_TASK_COMPLETED; | |
399 | task->sc = NULL; | |
3e5c28ad | 400 | |
9c19a7d0 MC |
401 | if (conn->task == task) |
402 | conn->task = NULL; | |
3e5c28ad | 403 | /* |
9c19a7d0 | 404 | * login task is preallocated so do not free |
3e5c28ad | 405 | */ |
9c19a7d0 | 406 | if (conn->login_task == task) |
3e5c28ad MC |
407 | return; |
408 | ||
9c19a7d0 | 409 | __kfifo_put(session->cmdpool.queue, (void*)&task, sizeof(void*)); |
052d0144 | 410 | |
9c19a7d0 MC |
411 | if (conn->ping_task == task) |
412 | conn->ping_task = NULL; | |
3e5c28ad MC |
413 | |
414 | if (sc) { | |
9c19a7d0 | 415 | task->sc = NULL; |
3e5c28ad MC |
416 | /* SCSI eh reuses commands to verify us */ |
417 | sc->SCp.ptr = NULL; | |
418 | /* | |
419 | * queue command may call this to free the task, but | |
420 | * not have setup the sc callback | |
421 | */ | |
422 | if (sc->scsi_done) | |
423 | sc->scsi_done(sc); | |
424 | } | |
7996a778 MC |
425 | } |
426 | ||
913e5bf4 | 427 | void __iscsi_get_task(struct iscsi_task *task) |
60ecebf5 | 428 | { |
9c19a7d0 | 429 | atomic_inc(&task->refcount); |
60ecebf5 | 430 | } |
913e5bf4 | 431 | EXPORT_SYMBOL_GPL(__iscsi_get_task); |
60ecebf5 | 432 | |
9c19a7d0 | 433 | static void __iscsi_put_task(struct iscsi_task *task) |
60ecebf5 | 434 | { |
9c19a7d0 MC |
435 | if (atomic_dec_and_test(&task->refcount)) |
436 | iscsi_complete_command(task); | |
60ecebf5 MC |
437 | } |
438 | ||
9c19a7d0 | 439 | void iscsi_put_task(struct iscsi_task *task) |
3e5c28ad | 440 | { |
9c19a7d0 | 441 | struct iscsi_session *session = task->conn->session; |
3e5c28ad MC |
442 | |
443 | spin_lock_bh(&session->lock); | |
9c19a7d0 | 444 | __iscsi_put_task(task); |
3e5c28ad MC |
445 | spin_unlock_bh(&session->lock); |
446 | } | |
9c19a7d0 | 447 | EXPORT_SYMBOL_GPL(iscsi_put_task); |
3e5c28ad | 448 | |
b3a7ea8d MC |
449 | /* |
450 | * session lock must be held | |
451 | */ | |
9c19a7d0 | 452 | static void fail_command(struct iscsi_conn *conn, struct iscsi_task *task, |
b3a7ea8d MC |
453 | int err) |
454 | { | |
455 | struct scsi_cmnd *sc; | |
456 | ||
9c19a7d0 | 457 | sc = task->sc; |
b3a7ea8d MC |
458 | if (!sc) |
459 | return; | |
460 | ||
9c19a7d0 | 461 | if (task->state == ISCSI_TASK_PENDING) |
b3a7ea8d MC |
462 | /* |
463 | * cmd never made it to the xmit thread, so we should not count | |
464 | * the cmd in the sequencing | |
465 | */ | |
466 | conn->session->queued_cmdsn--; | |
b3a7ea8d MC |
467 | |
468 | sc->result = err; | |
c07d4444 BH |
469 | if (!scsi_bidi_cmnd(sc)) |
470 | scsi_set_resid(sc, scsi_bufflen(sc)); | |
471 | else { | |
472 | scsi_out(sc)->resid = scsi_out(sc)->length; | |
473 | scsi_in(sc)->resid = scsi_in(sc)->length; | |
474 | } | |
3e5c28ad | 475 | |
9c19a7d0 MC |
476 | if (conn->task == task) |
477 | conn->task = NULL; | |
b3a7ea8d | 478 | /* release ref from queuecommand */ |
9c19a7d0 | 479 | __iscsi_put_task(task); |
b3a7ea8d MC |
480 | } |
481 | ||
3e5c28ad | 482 | static int iscsi_prep_mgmt_task(struct iscsi_conn *conn, |
9c19a7d0 | 483 | struct iscsi_task *task) |
052d0144 MC |
484 | { |
485 | struct iscsi_session *session = conn->session; | |
577577da | 486 | struct iscsi_hdr *hdr = task->hdr; |
052d0144 MC |
487 | struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr; |
488 | ||
489 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) | |
490 | return -ENOTCONN; | |
491 | ||
492 | if (hdr->opcode != (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) && | |
493 | hdr->opcode != (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE)) | |
494 | nop->exp_statsn = cpu_to_be32(conn->exp_statsn); | |
495 | /* | |
496 | * pre-format CmdSN for outgoing PDU. | |
497 | */ | |
498 | nop->cmdsn = cpu_to_be32(session->cmdsn); | |
499 | if (hdr->itt != RESERVED_ITT) { | |
052d0144 MC |
500 | /* |
501 | * TODO: We always use immediate, so we never hit this. | |
502 | * If we start to send tmfs or nops as non-immediate then | |
503 | * we should start checking the cmdsn numbers for mgmt tasks. | |
504 | */ | |
505 | if (conn->c_stage == ISCSI_CONN_STARTED && | |
506 | !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { | |
507 | session->queued_cmdsn++; | |
508 | session->cmdsn++; | |
509 | } | |
510 | } | |
511 | ||
ae15f801 MC |
512 | if (session->tt->init_task && session->tt->init_task(task)) |
513 | return -EIO; | |
052d0144 MC |
514 | |
515 | if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT) | |
516 | session->state = ISCSI_STATE_LOGGING_OUT; | |
517 | ||
577577da | 518 | task->state = ISCSI_TASK_RUNNING; |
9c19a7d0 | 519 | list_move_tail(&task->running, &conn->mgmt_run_list); |
1b2c7af8 MC |
520 | ISCSI_DBG_SESSION(session, "mgmtpdu [op 0x%x hdr->itt 0x%x " |
521 | "datalen %d]\n", hdr->opcode & ISCSI_OPCODE_MASK, | |
522 | hdr->itt, task->data_count); | |
052d0144 MC |
523 | return 0; |
524 | } | |
525 | ||
9c19a7d0 | 526 | static struct iscsi_task * |
f6d5180c MC |
527 | __iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
528 | char *data, uint32_t data_size) | |
529 | { | |
530 | struct iscsi_session *session = conn->session; | |
9c19a7d0 | 531 | struct iscsi_task *task; |
262ef636 | 532 | itt_t itt; |
f6d5180c MC |
533 | |
534 | if (session->state == ISCSI_STATE_TERMINATE) | |
535 | return NULL; | |
536 | ||
537 | if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) || | |
538 | hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE)) | |
539 | /* | |
540 | * Login and Text are sent serially, in | |
541 | * request-followed-by-response sequence. | |
3e5c28ad MC |
542 | * Same task can be used. Same ITT must be used. |
543 | * Note that login_task is preallocated at conn_create(). | |
f6d5180c | 544 | */ |
9c19a7d0 | 545 | task = conn->login_task; |
f6d5180c MC |
546 | else { |
547 | BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE); | |
548 | BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED); | |
549 | ||
3e5c28ad | 550 | if (!__kfifo_get(session->cmdpool.queue, |
9c19a7d0 | 551 | (void*)&task, sizeof(void*))) |
f6d5180c MC |
552 | return NULL; |
553 | } | |
3e5c28ad MC |
554 | /* |
555 | * released in complete pdu for task we expect a response for, and | |
556 | * released by the lld when it has transmitted the task for | |
557 | * pdus we do not expect a response for. | |
558 | */ | |
9c19a7d0 MC |
559 | atomic_set(&task->refcount, 1); |
560 | task->conn = conn; | |
561 | task->sc = NULL; | |
f6d5180c MC |
562 | |
563 | if (data_size) { | |
9c19a7d0 MC |
564 | memcpy(task->data, data, data_size); |
565 | task->data_count = data_size; | |
f6d5180c | 566 | } else |
9c19a7d0 | 567 | task->data_count = 0; |
f6d5180c | 568 | |
2ff79d52 | 569 | if (conn->session->tt->alloc_pdu(task, hdr->opcode)) { |
577577da MC |
570 | iscsi_conn_printk(KERN_ERR, conn, "Could not allocate " |
571 | "pdu for mgmt task.\n"); | |
572 | goto requeue_task; | |
573 | } | |
262ef636 | 574 | itt = task->hdr->itt; |
577577da | 575 | task->hdr_len = sizeof(struct iscsi_hdr); |
9c19a7d0 | 576 | memcpy(task->hdr, hdr, sizeof(struct iscsi_hdr)); |
262ef636 MC |
577 | |
578 | if (hdr->itt != RESERVED_ITT) { | |
579 | if (session->tt->parse_pdu_itt) | |
580 | task->hdr->itt = itt; | |
581 | else | |
582 | task->hdr->itt = build_itt(task->itt, | |
583 | task->conn->session->age); | |
584 | } | |
585 | ||
9c19a7d0 MC |
586 | INIT_LIST_HEAD(&task->running); |
587 | list_add_tail(&task->running, &conn->mgmtqueue); | |
052d0144 MC |
588 | |
589 | if (session->tt->caps & CAP_DATA_PATH_OFFLOAD) { | |
577577da MC |
590 | if (iscsi_prep_mgmt_task(conn, task)) |
591 | goto free_task; | |
052d0144 | 592 | |
9c19a7d0 | 593 | if (session->tt->xmit_task(task)) |
577577da | 594 | goto free_task; |
052d0144 MC |
595 | |
596 | } else | |
32ae763e | 597 | iscsi_conn_queue_work(conn); |
052d0144 | 598 | |
9c19a7d0 | 599 | return task; |
577577da MC |
600 | |
601 | free_task: | |
602 | __iscsi_put_task(task); | |
603 | return NULL; | |
604 | ||
605 | requeue_task: | |
606 | if (task != conn->login_task) | |
607 | __kfifo_put(session->cmdpool.queue, (void*)&task, | |
608 | sizeof(void*)); | |
609 | return NULL; | |
f6d5180c MC |
610 | } |
611 | ||
612 | int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr, | |
613 | char *data, uint32_t data_size) | |
614 | { | |
615 | struct iscsi_conn *conn = cls_conn->dd_data; | |
616 | struct iscsi_session *session = conn->session; | |
617 | int err = 0; | |
618 | ||
619 | spin_lock_bh(&session->lock); | |
620 | if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size)) | |
621 | err = -EPERM; | |
622 | spin_unlock_bh(&session->lock); | |
f6d5180c MC |
623 | return err; |
624 | } | |
625 | EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu); | |
626 | ||
7996a778 MC |
627 | /** |
628 | * iscsi_cmd_rsp - SCSI Command Response processing | |
629 | * @conn: iscsi connection | |
630 | * @hdr: iscsi header | |
9c19a7d0 | 631 | * @task: scsi command task |
7996a778 MC |
632 | * @data: cmd data buffer |
633 | * @datalen: len of buffer | |
634 | * | |
635 | * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and | |
9c19a7d0 | 636 | * then completes the command and task. |
7996a778 | 637 | **/ |
77a23c21 | 638 | static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
9c19a7d0 | 639 | struct iscsi_task *task, char *data, |
77a23c21 | 640 | int datalen) |
7996a778 | 641 | { |
7996a778 MC |
642 | struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)hdr; |
643 | struct iscsi_session *session = conn->session; | |
9c19a7d0 | 644 | struct scsi_cmnd *sc = task->sc; |
7996a778 | 645 | |
77a23c21 | 646 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr); |
7996a778 MC |
647 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; |
648 | ||
649 | sc->result = (DID_OK << 16) | rhdr->cmd_status; | |
650 | ||
651 | if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) { | |
652 | sc->result = DID_ERROR << 16; | |
653 | goto out; | |
654 | } | |
655 | ||
656 | if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) { | |
9b80cb4b | 657 | uint16_t senselen; |
7996a778 MC |
658 | |
659 | if (datalen < 2) { | |
660 | invalid_datalen: | |
322d739d MC |
661 | iscsi_conn_printk(KERN_ERR, conn, |
662 | "Got CHECK_CONDITION but invalid data " | |
663 | "buffer size of %d\n", datalen); | |
7996a778 MC |
664 | sc->result = DID_BAD_TARGET << 16; |
665 | goto out; | |
666 | } | |
667 | ||
8f333991 | 668 | senselen = get_unaligned_be16(data); |
7996a778 MC |
669 | if (datalen < senselen) |
670 | goto invalid_datalen; | |
671 | ||
672 | memcpy(sc->sense_buffer, data + 2, | |
9b80cb4b | 673 | min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE)); |
1b2c7af8 MC |
674 | ISCSI_DBG_SESSION(session, "copied %d bytes of sense\n", |
675 | min_t(uint16_t, senselen, | |
676 | SCSI_SENSE_BUFFERSIZE)); | |
7996a778 MC |
677 | } |
678 | ||
c07d4444 BH |
679 | if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW | |
680 | ISCSI_FLAG_CMD_BIDI_OVERFLOW)) { | |
681 | int res_count = be32_to_cpu(rhdr->bi_residual_count); | |
682 | ||
683 | if (scsi_bidi_cmnd(sc) && res_count > 0 && | |
684 | (rhdr->flags & ISCSI_FLAG_CMD_BIDI_OVERFLOW || | |
685 | res_count <= scsi_in(sc)->length)) | |
686 | scsi_in(sc)->resid = res_count; | |
687 | else | |
688 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
689 | } | |
690 | ||
7207fea4 BH |
691 | if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW | |
692 | ISCSI_FLAG_CMD_OVERFLOW)) { | |
7996a778 MC |
693 | int res_count = be32_to_cpu(rhdr->residual_count); |
694 | ||
7207fea4 BH |
695 | if (res_count > 0 && |
696 | (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || | |
697 | res_count <= scsi_bufflen(sc))) | |
c07d4444 | 698 | /* write side for bidi or uni-io set_resid */ |
1c138991 | 699 | scsi_set_resid(sc, res_count); |
7996a778 MC |
700 | else |
701 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
c07d4444 | 702 | } |
7996a778 | 703 | out: |
1b2c7af8 MC |
704 | ISCSI_DBG_SESSION(session, "done [sc %p res %d itt 0x%x]\n", |
705 | sc, sc->result, task->itt); | |
7996a778 MC |
706 | conn->scsirsp_pdus_cnt++; |
707 | ||
9c19a7d0 | 708 | __iscsi_put_task(task); |
7996a778 MC |
709 | } |
710 | ||
1d9edf02 MC |
711 | /** |
712 | * iscsi_data_in_rsp - SCSI Data-In Response processing | |
713 | * @conn: iscsi connection | |
714 | * @hdr: iscsi pdu | |
715 | * @task: scsi command task | |
716 | **/ | |
717 | static void | |
718 | iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
719 | struct iscsi_task *task) | |
720 | { | |
721 | struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)hdr; | |
722 | struct scsi_cmnd *sc = task->sc; | |
723 | ||
724 | if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS)) | |
725 | return; | |
726 | ||
727 | sc->result = (DID_OK << 16) | rhdr->cmd_status; | |
728 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; | |
729 | if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW | | |
730 | ISCSI_FLAG_DATA_OVERFLOW)) { | |
731 | int res_count = be32_to_cpu(rhdr->residual_count); | |
732 | ||
733 | if (res_count > 0 && | |
734 | (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || | |
735 | res_count <= scsi_in(sc)->length)) | |
736 | scsi_in(sc)->resid = res_count; | |
737 | else | |
738 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
739 | } | |
740 | ||
741 | conn->scsirsp_pdus_cnt++; | |
742 | __iscsi_put_task(task); | |
743 | } | |
744 | ||
7ea8b828 MC |
745 | static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr) |
746 | { | |
747 | struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr; | |
748 | ||
749 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
750 | conn->tmfrsp_pdus_cnt++; | |
751 | ||
843c0a8a | 752 | if (conn->tmf_state != TMF_QUEUED) |
7ea8b828 MC |
753 | return; |
754 | ||
755 | if (tmf->response == ISCSI_TMF_RSP_COMPLETE) | |
843c0a8a | 756 | conn->tmf_state = TMF_SUCCESS; |
7ea8b828 | 757 | else if (tmf->response == ISCSI_TMF_RSP_NO_TASK) |
843c0a8a | 758 | conn->tmf_state = TMF_NOT_FOUND; |
7ea8b828 | 759 | else |
843c0a8a | 760 | conn->tmf_state = TMF_FAILED; |
7ea8b828 MC |
761 | wake_up(&conn->ehwait); |
762 | } | |
763 | ||
f6d5180c MC |
764 | static void iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr) |
765 | { | |
766 | struct iscsi_nopout hdr; | |
9c19a7d0 | 767 | struct iscsi_task *task; |
f6d5180c | 768 | |
9c19a7d0 | 769 | if (!rhdr && conn->ping_task) |
f6d5180c MC |
770 | return; |
771 | ||
772 | memset(&hdr, 0, sizeof(struct iscsi_nopout)); | |
773 | hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE; | |
774 | hdr.flags = ISCSI_FLAG_CMD_FINAL; | |
775 | ||
776 | if (rhdr) { | |
777 | memcpy(hdr.lun, rhdr->lun, 8); | |
778 | hdr.ttt = rhdr->ttt; | |
779 | hdr.itt = RESERVED_ITT; | |
780 | } else | |
781 | hdr.ttt = RESERVED_ITT; | |
782 | ||
9c19a7d0 MC |
783 | task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0); |
784 | if (!task) | |
322d739d | 785 | iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n"); |
d3acf022 MC |
786 | else if (!rhdr) { |
787 | /* only track our nops */ | |
788 | conn->ping_task = task; | |
789 | conn->last_ping = jiffies; | |
790 | } | |
f6d5180c MC |
791 | } |
792 | ||
62f38300 MC |
793 | static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
794 | char *data, int datalen) | |
795 | { | |
796 | struct iscsi_reject *reject = (struct iscsi_reject *)hdr; | |
797 | struct iscsi_hdr rejected_pdu; | |
62f38300 MC |
798 | |
799 | conn->exp_statsn = be32_to_cpu(reject->statsn) + 1; | |
800 | ||
801 | if (reject->reason == ISCSI_REASON_DATA_DIGEST_ERROR) { | |
802 | if (ntoh24(reject->dlength) > datalen) | |
803 | return ISCSI_ERR_PROTO; | |
804 | ||
805 | if (ntoh24(reject->dlength) >= sizeof(struct iscsi_hdr)) { | |
806 | memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr)); | |
322d739d | 807 | iscsi_conn_printk(KERN_ERR, conn, |
262ef636 MC |
808 | "pdu (op 0x%x) rejected " |
809 | "due to DataDigest error.\n", | |
322d739d | 810 | rejected_pdu.opcode); |
62f38300 MC |
811 | } |
812 | } | |
813 | return 0; | |
814 | } | |
815 | ||
913e5bf4 MC |
816 | /** |
817 | * iscsi_itt_to_task - look up task by itt | |
818 | * @conn: iscsi connection | |
819 | * @itt: itt | |
820 | * | |
821 | * This should be used for mgmt tasks like login and nops, or if | |
822 | * the LDD's itt space does not include the session age. | |
823 | * | |
824 | * The session lock must be held. | |
825 | */ | |
826 | static struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *conn, itt_t itt) | |
827 | { | |
828 | struct iscsi_session *session = conn->session; | |
262ef636 | 829 | int i; |
913e5bf4 MC |
830 | |
831 | if (itt == RESERVED_ITT) | |
832 | return NULL; | |
833 | ||
262ef636 MC |
834 | if (session->tt->parse_pdu_itt) |
835 | session->tt->parse_pdu_itt(conn, itt, &i, NULL); | |
836 | else | |
837 | i = get_itt(itt); | |
913e5bf4 MC |
838 | if (i >= session->cmds_max) |
839 | return NULL; | |
840 | ||
841 | return session->cmds[i]; | |
842 | } | |
843 | ||
7996a778 MC |
844 | /** |
845 | * __iscsi_complete_pdu - complete pdu | |
846 | * @conn: iscsi conn | |
847 | * @hdr: iscsi header | |
848 | * @data: data buffer | |
849 | * @datalen: len of data buffer | |
850 | * | |
851 | * Completes pdu processing by freeing any resources allocated at | |
852 | * queuecommand or send generic. session lock must be held and verify | |
853 | * itt must have been called. | |
854 | */ | |
913e5bf4 MC |
855 | int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
856 | char *data, int datalen) | |
7996a778 MC |
857 | { |
858 | struct iscsi_session *session = conn->session; | |
859 | int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0; | |
9c19a7d0 | 860 | struct iscsi_task *task; |
7996a778 MC |
861 | uint32_t itt; |
862 | ||
f6d5180c | 863 | conn->last_recv = jiffies; |
0af967f5 MC |
864 | rc = iscsi_verify_itt(conn, hdr->itt); |
865 | if (rc) | |
866 | return rc; | |
867 | ||
b4377356 AV |
868 | if (hdr->itt != RESERVED_ITT) |
869 | itt = get_itt(hdr->itt); | |
7996a778 | 870 | else |
b4377356 | 871 | itt = ~0U; |
7996a778 | 872 | |
1b2c7af8 MC |
873 | ISCSI_DBG_SESSION(session, "[op 0x%x cid %d itt 0x%x len %d]\n", |
874 | opcode, conn->id, itt, datalen); | |
7996a778 | 875 | |
3e5c28ad | 876 | if (itt == ~0U) { |
77a23c21 | 877 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); |
62f38300 | 878 | |
7996a778 MC |
879 | switch(opcode) { |
880 | case ISCSI_OP_NOOP_IN: | |
40527afe | 881 | if (datalen) { |
7996a778 | 882 | rc = ISCSI_ERR_PROTO; |
40527afe MC |
883 | break; |
884 | } | |
885 | ||
b4377356 | 886 | if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG)) |
40527afe MC |
887 | break; |
888 | ||
f6d5180c | 889 | iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr); |
7996a778 MC |
890 | break; |
891 | case ISCSI_OP_REJECT: | |
62f38300 MC |
892 | rc = iscsi_handle_reject(conn, hdr, data, datalen); |
893 | break; | |
7996a778 | 894 | case ISCSI_OP_ASYNC_EVENT: |
8d2860b3 | 895 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; |
5831c737 MC |
896 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) |
897 | rc = ISCSI_ERR_CONN_FAILED; | |
7996a778 MC |
898 | break; |
899 | default: | |
900 | rc = ISCSI_ERR_BAD_OPCODE; | |
901 | break; | |
902 | } | |
3e5c28ad MC |
903 | goto out; |
904 | } | |
905 | ||
3e5c28ad MC |
906 | switch(opcode) { |
907 | case ISCSI_OP_SCSI_CMD_RSP: | |
913e5bf4 MC |
908 | case ISCSI_OP_SCSI_DATA_IN: |
909 | task = iscsi_itt_to_ctask(conn, hdr->itt); | |
910 | if (!task) | |
911 | return ISCSI_ERR_BAD_ITT; | |
912 | break; | |
913 | case ISCSI_OP_R2T: | |
914 | /* | |
915 | * LLD handles R2Ts if they need to. | |
916 | */ | |
917 | return 0; | |
918 | case ISCSI_OP_LOGOUT_RSP: | |
919 | case ISCSI_OP_LOGIN_RSP: | |
920 | case ISCSI_OP_TEXT_RSP: | |
921 | case ISCSI_OP_SCSI_TMFUNC_RSP: | |
922 | case ISCSI_OP_NOOP_IN: | |
923 | task = iscsi_itt_to_task(conn, hdr->itt); | |
924 | if (!task) | |
925 | return ISCSI_ERR_BAD_ITT; | |
926 | break; | |
927 | default: | |
928 | return ISCSI_ERR_BAD_OPCODE; | |
929 | } | |
930 | ||
931 | switch(opcode) { | |
932 | case ISCSI_OP_SCSI_CMD_RSP: | |
9c19a7d0 | 933 | iscsi_scsi_cmd_rsp(conn, hdr, task, data, datalen); |
3e5c28ad MC |
934 | break; |
935 | case ISCSI_OP_SCSI_DATA_IN: | |
1d9edf02 | 936 | iscsi_data_in_rsp(conn, hdr, task); |
3e5c28ad | 937 | break; |
3e5c28ad MC |
938 | case ISCSI_OP_LOGOUT_RSP: |
939 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
940 | if (datalen) { | |
941 | rc = ISCSI_ERR_PROTO; | |
942 | break; | |
943 | } | |
944 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
945 | goto recv_pdu; | |
946 | case ISCSI_OP_LOGIN_RSP: | |
947 | case ISCSI_OP_TEXT_RSP: | |
948 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
949 | /* | |
950 | * login related PDU's exp_statsn is handled in | |
951 | * userspace | |
952 | */ | |
953 | goto recv_pdu; | |
954 | case ISCSI_OP_SCSI_TMFUNC_RSP: | |
955 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
956 | if (datalen) { | |
957 | rc = ISCSI_ERR_PROTO; | |
958 | break; | |
959 | } | |
960 | ||
961 | iscsi_tmf_rsp(conn, hdr); | |
9c19a7d0 | 962 | __iscsi_put_task(task); |
3e5c28ad MC |
963 | break; |
964 | case ISCSI_OP_NOOP_IN: | |
965 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
966 | if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) { | |
967 | rc = ISCSI_ERR_PROTO; | |
968 | break; | |
969 | } | |
970 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
971 | ||
9c19a7d0 | 972 | if (conn->ping_task != task) |
3e5c28ad MC |
973 | /* |
974 | * If this is not in response to one of our | |
975 | * nops then it must be from userspace. | |
976 | */ | |
977 | goto recv_pdu; | |
9c19a7d0 MC |
978 | |
979 | mod_timer(&conn->transport_timer, jiffies + conn->recv_timeout); | |
980 | __iscsi_put_task(task); | |
3e5c28ad MC |
981 | break; |
982 | default: | |
983 | rc = ISCSI_ERR_BAD_OPCODE; | |
984 | break; | |
985 | } | |
7996a778 | 986 | |
3e5c28ad MC |
987 | out: |
988 | return rc; | |
989 | recv_pdu: | |
990 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) | |
991 | rc = ISCSI_ERR_CONN_FAILED; | |
9c19a7d0 | 992 | __iscsi_put_task(task); |
7996a778 MC |
993 | return rc; |
994 | } | |
913e5bf4 | 995 | EXPORT_SYMBOL_GPL(__iscsi_complete_pdu); |
7996a778 MC |
996 | |
997 | int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
998 | char *data, int datalen) | |
999 | { | |
1000 | int rc; | |
1001 | ||
1002 | spin_lock(&conn->session->lock); | |
1003 | rc = __iscsi_complete_pdu(conn, hdr, data, datalen); | |
1004 | spin_unlock(&conn->session->lock); | |
1005 | return rc; | |
1006 | } | |
1007 | EXPORT_SYMBOL_GPL(iscsi_complete_pdu); | |
1008 | ||
0af967f5 | 1009 | int iscsi_verify_itt(struct iscsi_conn *conn, itt_t itt) |
7996a778 MC |
1010 | { |
1011 | struct iscsi_session *session = conn->session; | |
262ef636 | 1012 | int age = 0, i = 0; |
7996a778 | 1013 | |
0af967f5 MC |
1014 | if (itt == RESERVED_ITT) |
1015 | return 0; | |
7996a778 | 1016 | |
262ef636 MC |
1017 | if (session->tt->parse_pdu_itt) |
1018 | session->tt->parse_pdu_itt(conn, itt, &i, &age); | |
1019 | else { | |
1020 | i = get_itt(itt); | |
1021 | age = ((__force u32)itt >> ISCSI_AGE_SHIFT) & ISCSI_AGE_MASK; | |
1022 | } | |
1023 | ||
1024 | if (age != session->age) { | |
0af967f5 MC |
1025 | iscsi_conn_printk(KERN_ERR, conn, |
1026 | "received itt %x expected session age (%x)\n", | |
913e5bf4 | 1027 | (__force u32)itt, session->age); |
0af967f5 MC |
1028 | return ISCSI_ERR_BAD_ITT; |
1029 | } | |
7996a778 | 1030 | |
3e5c28ad MC |
1031 | if (i >= session->cmds_max) { |
1032 | iscsi_conn_printk(KERN_ERR, conn, | |
1033 | "received invalid itt index %u (max cmds " | |
1034 | "%u.\n", i, session->cmds_max); | |
1035 | return ISCSI_ERR_BAD_ITT; | |
7996a778 | 1036 | } |
7996a778 MC |
1037 | return 0; |
1038 | } | |
1039 | EXPORT_SYMBOL_GPL(iscsi_verify_itt); | |
1040 | ||
913e5bf4 MC |
1041 | /** |
1042 | * iscsi_itt_to_ctask - look up ctask by itt | |
1043 | * @conn: iscsi connection | |
1044 | * @itt: itt | |
1045 | * | |
1046 | * This should be used for cmd tasks. | |
1047 | * | |
1048 | * The session lock must be held. | |
1049 | */ | |
1050 | struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *conn, itt_t itt) | |
0af967f5 | 1051 | { |
9c19a7d0 | 1052 | struct iscsi_task *task; |
0af967f5 MC |
1053 | |
1054 | if (iscsi_verify_itt(conn, itt)) | |
1055 | return NULL; | |
1056 | ||
913e5bf4 MC |
1057 | task = iscsi_itt_to_task(conn, itt); |
1058 | if (!task || !task->sc) | |
0af967f5 MC |
1059 | return NULL; |
1060 | ||
913e5bf4 MC |
1061 | if (task->sc->SCp.phase != conn->session->age) { |
1062 | iscsi_session_printk(KERN_ERR, conn->session, | |
1063 | "task's session age %d, expected %d\n", | |
1064 | task->sc->SCp.phase, conn->session->age); | |
0af967f5 | 1065 | return NULL; |
913e5bf4 | 1066 | } |
0af967f5 | 1067 | |
9c19a7d0 | 1068 | return task; |
0af967f5 MC |
1069 | } |
1070 | EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask); | |
1071 | ||
40a06e75 | 1072 | void iscsi_session_failure(struct iscsi_session *session, |
e5bd7b54 MC |
1073 | enum iscsi_err err) |
1074 | { | |
e5bd7b54 MC |
1075 | struct iscsi_conn *conn; |
1076 | struct device *dev; | |
1077 | unsigned long flags; | |
1078 | ||
1079 | spin_lock_irqsave(&session->lock, flags); | |
1080 | conn = session->leadconn; | |
1081 | if (session->state == ISCSI_STATE_TERMINATE || !conn) { | |
1082 | spin_unlock_irqrestore(&session->lock, flags); | |
1083 | return; | |
1084 | } | |
1085 | ||
1086 | dev = get_device(&conn->cls_conn->dev); | |
1087 | spin_unlock_irqrestore(&session->lock, flags); | |
1088 | if (!dev) | |
1089 | return; | |
1090 | /* | |
1091 | * if the host is being removed bypass the connection | |
1092 | * recovery initialization because we are going to kill | |
1093 | * the session. | |
1094 | */ | |
1095 | if (err == ISCSI_ERR_INVALID_HOST) | |
1096 | iscsi_conn_error_event(conn->cls_conn, err); | |
1097 | else | |
1098 | iscsi_conn_failure(conn, err); | |
1099 | put_device(dev); | |
1100 | } | |
1101 | EXPORT_SYMBOL_GPL(iscsi_session_failure); | |
1102 | ||
7996a778 MC |
1103 | void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err) |
1104 | { | |
1105 | struct iscsi_session *session = conn->session; | |
1106 | unsigned long flags; | |
1107 | ||
1108 | spin_lock_irqsave(&session->lock, flags); | |
656cffc9 MC |
1109 | if (session->state == ISCSI_STATE_FAILED) { |
1110 | spin_unlock_irqrestore(&session->lock, flags); | |
1111 | return; | |
1112 | } | |
1113 | ||
67a61114 | 1114 | if (conn->stop_stage == 0) |
7996a778 MC |
1115 | session->state = ISCSI_STATE_FAILED; |
1116 | spin_unlock_irqrestore(&session->lock, flags); | |
e5bd7b54 | 1117 | |
7996a778 MC |
1118 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); |
1119 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
e5bd7b54 | 1120 | iscsi_conn_error_event(conn->cls_conn, err); |
7996a778 MC |
1121 | } |
1122 | EXPORT_SYMBOL_GPL(iscsi_conn_failure); | |
1123 | ||
77a23c21 MC |
1124 | static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn) |
1125 | { | |
1126 | struct iscsi_session *session = conn->session; | |
1127 | ||
1128 | /* | |
1129 | * Check for iSCSI window and take care of CmdSN wrap-around | |
1130 | */ | |
e0726407 | 1131 | if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) { |
1b2c7af8 MC |
1132 | ISCSI_DBG_SESSION(session, "iSCSI CmdSN closed. ExpCmdSn " |
1133 | "%u MaxCmdSN %u CmdSN %u/%u\n", | |
1134 | session->exp_cmdsn, session->max_cmdsn, | |
1135 | session->cmdsn, session->queued_cmdsn); | |
77a23c21 MC |
1136 | return -ENOSPC; |
1137 | } | |
1138 | return 0; | |
1139 | } | |
1140 | ||
9c19a7d0 | 1141 | static int iscsi_xmit_task(struct iscsi_conn *conn) |
77a23c21 | 1142 | { |
9c19a7d0 | 1143 | struct iscsi_task *task = conn->task; |
843c0a8a | 1144 | int rc; |
77a23c21 | 1145 | |
9c19a7d0 | 1146 | __iscsi_get_task(task); |
77a23c21 | 1147 | spin_unlock_bh(&conn->session->lock); |
9c19a7d0 | 1148 | rc = conn->session->tt->xmit_task(task); |
77a23c21 | 1149 | spin_lock_bh(&conn->session->lock); |
9c19a7d0 | 1150 | __iscsi_put_task(task); |
77a23c21 | 1151 | if (!rc) |
9c19a7d0 MC |
1152 | /* done with this task */ |
1153 | conn->task = NULL; | |
77a23c21 MC |
1154 | return rc; |
1155 | } | |
1156 | ||
843c0a8a | 1157 | /** |
9c19a7d0 MC |
1158 | * iscsi_requeue_task - requeue task to run from session workqueue |
1159 | * @task: task to requeue | |
843c0a8a | 1160 | * |
9c19a7d0 | 1161 | * LLDs that need to run a task from the session workqueue should call |
052d0144 MC |
1162 | * this. The session lock must be held. This should only be called |
1163 | * by software drivers. | |
843c0a8a | 1164 | */ |
9c19a7d0 | 1165 | void iscsi_requeue_task(struct iscsi_task *task) |
843c0a8a | 1166 | { |
9c19a7d0 | 1167 | struct iscsi_conn *conn = task->conn; |
843c0a8a | 1168 | |
9c19a7d0 | 1169 | list_move_tail(&task->running, &conn->requeue); |
32ae763e | 1170 | iscsi_conn_queue_work(conn); |
843c0a8a | 1171 | } |
9c19a7d0 | 1172 | EXPORT_SYMBOL_GPL(iscsi_requeue_task); |
843c0a8a | 1173 | |
7996a778 MC |
1174 | /** |
1175 | * iscsi_data_xmit - xmit any command into the scheduled connection | |
1176 | * @conn: iscsi connection | |
1177 | * | |
1178 | * Notes: | |
1179 | * The function can return -EAGAIN in which case the caller must | |
1180 | * re-schedule it again later or recover. '0' return code means | |
1181 | * successful xmit. | |
1182 | **/ | |
1183 | static int iscsi_data_xmit(struct iscsi_conn *conn) | |
1184 | { | |
3219e529 | 1185 | int rc = 0; |
7996a778 | 1186 | |
77a23c21 | 1187 | spin_lock_bh(&conn->session->lock); |
7996a778 | 1188 | if (unlikely(conn->suspend_tx)) { |
1b2c7af8 | 1189 | ISCSI_DBG_SESSION(conn->session, "Tx suspended!\n"); |
77a23c21 | 1190 | spin_unlock_bh(&conn->session->lock); |
3219e529 | 1191 | return -ENODATA; |
7996a778 | 1192 | } |
7996a778 | 1193 | |
9c19a7d0 MC |
1194 | if (conn->task) { |
1195 | rc = iscsi_xmit_task(conn); | |
3219e529 | 1196 | if (rc) |
7996a778 | 1197 | goto again; |
7996a778 MC |
1198 | } |
1199 | ||
77a23c21 MC |
1200 | /* |
1201 | * process mgmt pdus like nops before commands since we should | |
1202 | * only have one nop-out as a ping from us and targets should not | |
1203 | * overflow us with nop-ins | |
1204 | */ | |
1205 | check_mgmt: | |
843c0a8a | 1206 | while (!list_empty(&conn->mgmtqueue)) { |
9c19a7d0 MC |
1207 | conn->task = list_entry(conn->mgmtqueue.next, |
1208 | struct iscsi_task, running); | |
1209 | if (iscsi_prep_mgmt_task(conn, conn->task)) { | |
1210 | __iscsi_put_task(conn->task); | |
1211 | conn->task = NULL; | |
b3a7ea8d MC |
1212 | continue; |
1213 | } | |
9c19a7d0 | 1214 | rc = iscsi_xmit_task(conn); |
77a23c21 MC |
1215 | if (rc) |
1216 | goto again; | |
7996a778 MC |
1217 | } |
1218 | ||
843c0a8a | 1219 | /* process pending command queue */ |
b6c395ed | 1220 | while (!list_empty(&conn->xmitqueue)) { |
843c0a8a MC |
1221 | if (conn->tmf_state == TMF_QUEUED) |
1222 | break; | |
1223 | ||
9c19a7d0 MC |
1224 | conn->task = list_entry(conn->xmitqueue.next, |
1225 | struct iscsi_task, running); | |
b3a7ea8d | 1226 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) { |
9c19a7d0 | 1227 | fail_command(conn, conn->task, DID_IMM_RETRY << 16); |
b3a7ea8d MC |
1228 | continue; |
1229 | } | |
577577da MC |
1230 | rc = iscsi_prep_scsi_cmd_pdu(conn->task); |
1231 | if (rc) { | |
1232 | if (rc == -ENOMEM) { | |
1233 | conn->task = NULL; | |
1234 | goto again; | |
1235 | } else | |
1236 | fail_command(conn, conn->task, DID_ABORT << 16); | |
004d6530 BH |
1237 | continue; |
1238 | } | |
9c19a7d0 | 1239 | rc = iscsi_xmit_task(conn); |
77a23c21 | 1240 | if (rc) |
60ecebf5 | 1241 | goto again; |
77a23c21 | 1242 | /* |
9c19a7d0 | 1243 | * we could continuously get new task requests so |
77a23c21 MC |
1244 | * we need to check the mgmt queue for nops that need to |
1245 | * be sent to aviod starvation | |
1246 | */ | |
843c0a8a MC |
1247 | if (!list_empty(&conn->mgmtqueue)) |
1248 | goto check_mgmt; | |
1249 | } | |
1250 | ||
1251 | while (!list_empty(&conn->requeue)) { | |
1252 | if (conn->session->fast_abort && conn->tmf_state != TMF_INITIAL) | |
1253 | break; | |
1254 | ||
b3a7ea8d MC |
1255 | /* |
1256 | * we always do fastlogout - conn stop code will clean up. | |
1257 | */ | |
1258 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) | |
1259 | break; | |
1260 | ||
9c19a7d0 MC |
1261 | conn->task = list_entry(conn->requeue.next, |
1262 | struct iscsi_task, running); | |
1263 | conn->task->state = ISCSI_TASK_RUNNING; | |
843c0a8a | 1264 | list_move_tail(conn->requeue.next, &conn->run_list); |
9c19a7d0 | 1265 | rc = iscsi_xmit_task(conn); |
843c0a8a MC |
1266 | if (rc) |
1267 | goto again; | |
1268 | if (!list_empty(&conn->mgmtqueue)) | |
77a23c21 | 1269 | goto check_mgmt; |
7996a778 | 1270 | } |
b6c395ed | 1271 | spin_unlock_bh(&conn->session->lock); |
3219e529 | 1272 | return -ENODATA; |
7996a778 MC |
1273 | |
1274 | again: | |
1275 | if (unlikely(conn->suspend_tx)) | |
77a23c21 MC |
1276 | rc = -ENODATA; |
1277 | spin_unlock_bh(&conn->session->lock); | |
3219e529 | 1278 | return rc; |
7996a778 MC |
1279 | } |
1280 | ||
c4028958 | 1281 | static void iscsi_xmitworker(struct work_struct *work) |
7996a778 | 1282 | { |
c4028958 DH |
1283 | struct iscsi_conn *conn = |
1284 | container_of(work, struct iscsi_conn, xmitwork); | |
3219e529 | 1285 | int rc; |
7996a778 MC |
1286 | /* |
1287 | * serialize Xmit worker on a per-connection basis. | |
1288 | */ | |
3219e529 MC |
1289 | do { |
1290 | rc = iscsi_data_xmit(conn); | |
1291 | } while (rc >= 0 || rc == -EAGAIN); | |
7996a778 MC |
1292 | } |
1293 | ||
577577da MC |
1294 | static inline struct iscsi_task *iscsi_alloc_task(struct iscsi_conn *conn, |
1295 | struct scsi_cmnd *sc) | |
1296 | { | |
1297 | struct iscsi_task *task; | |
1298 | ||
1299 | if (!__kfifo_get(conn->session->cmdpool.queue, | |
1300 | (void *) &task, sizeof(void *))) | |
1301 | return NULL; | |
1302 | ||
1303 | sc->SCp.phase = conn->session->age; | |
1304 | sc->SCp.ptr = (char *) task; | |
1305 | ||
1306 | atomic_set(&task->refcount, 1); | |
1307 | task->state = ISCSI_TASK_PENDING; | |
1308 | task->conn = conn; | |
1309 | task->sc = sc; | |
1310 | INIT_LIST_HEAD(&task->running); | |
1311 | return task; | |
1312 | } | |
1313 | ||
7996a778 MC |
1314 | enum { |
1315 | FAILURE_BAD_HOST = 1, | |
1316 | FAILURE_SESSION_FAILED, | |
1317 | FAILURE_SESSION_FREED, | |
1318 | FAILURE_WINDOW_CLOSED, | |
60ecebf5 | 1319 | FAILURE_OOM, |
7996a778 | 1320 | FAILURE_SESSION_TERMINATE, |
656cffc9 | 1321 | FAILURE_SESSION_IN_RECOVERY, |
7996a778 | 1322 | FAILURE_SESSION_RECOVERY_TIMEOUT, |
b3a7ea8d | 1323 | FAILURE_SESSION_LOGGING_OUT, |
6eabafbe | 1324 | FAILURE_SESSION_NOT_READY, |
7996a778 MC |
1325 | }; |
1326 | ||
1327 | int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *)) | |
1328 | { | |
75613521 | 1329 | struct iscsi_cls_session *cls_session; |
7996a778 MC |
1330 | struct Scsi_Host *host; |
1331 | int reason = 0; | |
1332 | struct iscsi_session *session; | |
1333 | struct iscsi_conn *conn; | |
9c19a7d0 | 1334 | struct iscsi_task *task = NULL; |
7996a778 MC |
1335 | |
1336 | sc->scsi_done = done; | |
1337 | sc->result = 0; | |
f47f2cf5 | 1338 | sc->SCp.ptr = NULL; |
7996a778 MC |
1339 | |
1340 | host = sc->device->host; | |
1040c99d | 1341 | spin_unlock(host->host_lock); |
7996a778 | 1342 | |
75613521 MC |
1343 | cls_session = starget_to_session(scsi_target(sc->device)); |
1344 | session = cls_session->dd_data; | |
7996a778 MC |
1345 | spin_lock(&session->lock); |
1346 | ||
75613521 | 1347 | reason = iscsi_session_chkready(cls_session); |
6eabafbe MC |
1348 | if (reason) { |
1349 | sc->result = reason; | |
1350 | goto fault; | |
1351 | } | |
1352 | ||
656cffc9 MC |
1353 | /* |
1354 | * ISCSI_STATE_FAILED is a temp. state. The recovery | |
1355 | * code will decide what is best to do with command queued | |
1356 | * during this time | |
1357 | */ | |
1358 | if (session->state != ISCSI_STATE_LOGGED_IN && | |
1359 | session->state != ISCSI_STATE_FAILED) { | |
1360 | /* | |
1361 | * to handle the race between when we set the recovery state | |
1362 | * and block the session we requeue here (commands could | |
1363 | * be entering our queuecommand while a block is starting | |
1364 | * up because the block code is not locked) | |
1365 | */ | |
9000bcd6 MC |
1366 | switch (session->state) { |
1367 | case ISCSI_STATE_IN_RECOVERY: | |
656cffc9 | 1368 | reason = FAILURE_SESSION_IN_RECOVERY; |
d6d13ee1 | 1369 | goto reject; |
9000bcd6 MC |
1370 | case ISCSI_STATE_LOGGING_OUT: |
1371 | reason = FAILURE_SESSION_LOGGING_OUT; | |
d6d13ee1 | 1372 | goto reject; |
b3a7ea8d | 1373 | case ISCSI_STATE_RECOVERY_FAILED: |
656cffc9 | 1374 | reason = FAILURE_SESSION_RECOVERY_TIMEOUT; |
56d7fcfa | 1375 | sc->result = DID_TRANSPORT_FAILFAST << 16; |
b3a7ea8d MC |
1376 | break; |
1377 | case ISCSI_STATE_TERMINATE: | |
656cffc9 | 1378 | reason = FAILURE_SESSION_TERMINATE; |
6eabafbe | 1379 | sc->result = DID_NO_CONNECT << 16; |
b3a7ea8d | 1380 | break; |
b3a7ea8d | 1381 | default: |
656cffc9 | 1382 | reason = FAILURE_SESSION_FREED; |
6eabafbe | 1383 | sc->result = DID_NO_CONNECT << 16; |
b3a7ea8d | 1384 | } |
7996a778 MC |
1385 | goto fault; |
1386 | } | |
1387 | ||
7996a778 | 1388 | conn = session->leadconn; |
98644047 MC |
1389 | if (!conn) { |
1390 | reason = FAILURE_SESSION_FREED; | |
6eabafbe | 1391 | sc->result = DID_NO_CONNECT << 16; |
98644047 MC |
1392 | goto fault; |
1393 | } | |
7996a778 | 1394 | |
77a23c21 MC |
1395 | if (iscsi_check_cmdsn_window_closed(conn)) { |
1396 | reason = FAILURE_WINDOW_CLOSED; | |
1397 | goto reject; | |
1398 | } | |
1399 | ||
577577da MC |
1400 | task = iscsi_alloc_task(conn, sc); |
1401 | if (!task) { | |
60ecebf5 MC |
1402 | reason = FAILURE_OOM; |
1403 | goto reject; | |
1404 | } | |
9c19a7d0 | 1405 | list_add_tail(&task->running, &conn->xmitqueue); |
7996a778 | 1406 | |
052d0144 | 1407 | if (session->tt->caps & CAP_DATA_PATH_OFFLOAD) { |
577577da MC |
1408 | reason = iscsi_prep_scsi_cmd_pdu(task); |
1409 | if (reason) { | |
1410 | if (reason == -ENOMEM) { | |
1411 | reason = FAILURE_OOM; | |
1412 | goto prepd_reject; | |
1413 | } else { | |
1414 | sc->result = DID_ABORT << 16; | |
1415 | goto prepd_fault; | |
1416 | } | |
052d0144 | 1417 | } |
9c19a7d0 | 1418 | if (session->tt->xmit_task(task)) { |
052d0144 | 1419 | reason = FAILURE_SESSION_NOT_READY; |
577577da | 1420 | goto prepd_reject; |
052d0144 MC |
1421 | } |
1422 | } else | |
32ae763e | 1423 | iscsi_conn_queue_work(conn); |
052d0144 MC |
1424 | |
1425 | session->queued_cmdsn++; | |
1426 | spin_unlock(&session->lock); | |
1040c99d | 1427 | spin_lock(host->host_lock); |
7996a778 MC |
1428 | return 0; |
1429 | ||
577577da MC |
1430 | prepd_reject: |
1431 | sc->scsi_done = NULL; | |
1432 | iscsi_complete_command(task); | |
7996a778 MC |
1433 | reject: |
1434 | spin_unlock(&session->lock); | |
1b2c7af8 MC |
1435 | ISCSI_DBG_SESSION(session, "cmd 0x%x rejected (%d)\n", |
1436 | sc->cmnd[0], reason); | |
1040c99d | 1437 | spin_lock(host->host_lock); |
d6d13ee1 | 1438 | return SCSI_MLQUEUE_TARGET_BUSY; |
7996a778 | 1439 | |
577577da MC |
1440 | prepd_fault: |
1441 | sc->scsi_done = NULL; | |
1442 | iscsi_complete_command(task); | |
7996a778 MC |
1443 | fault: |
1444 | spin_unlock(&session->lock); | |
1b2c7af8 MC |
1445 | ISCSI_DBG_SESSION(session, "iscsi: cmd 0x%x is not queued (%d)\n", |
1446 | sc->cmnd[0], reason); | |
c07d4444 BH |
1447 | if (!scsi_bidi_cmnd(sc)) |
1448 | scsi_set_resid(sc, scsi_bufflen(sc)); | |
1449 | else { | |
1450 | scsi_out(sc)->resid = scsi_out(sc)->length; | |
1451 | scsi_in(sc)->resid = scsi_in(sc)->length; | |
1452 | } | |
052d0144 | 1453 | done(sc); |
1040c99d | 1454 | spin_lock(host->host_lock); |
7996a778 MC |
1455 | return 0; |
1456 | } | |
1457 | EXPORT_SYMBOL_GPL(iscsi_queuecommand); | |
1458 | ||
1459 | int iscsi_change_queue_depth(struct scsi_device *sdev, int depth) | |
1460 | { | |
7996a778 MC |
1461 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); |
1462 | return sdev->queue_depth; | |
1463 | } | |
1464 | EXPORT_SYMBOL_GPL(iscsi_change_queue_depth); | |
1465 | ||
6b5d6c44 MC |
1466 | int iscsi_target_alloc(struct scsi_target *starget) |
1467 | { | |
1468 | struct iscsi_cls_session *cls_session = starget_to_session(starget); | |
1469 | struct iscsi_session *session = cls_session->dd_data; | |
1470 | ||
1471 | starget->can_queue = session->scsi_cmds_max; | |
1472 | return 0; | |
1473 | } | |
1474 | EXPORT_SYMBOL_GPL(iscsi_target_alloc); | |
1475 | ||
7996a778 MC |
1476 | void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session) |
1477 | { | |
75613521 | 1478 | struct iscsi_session *session = cls_session->dd_data; |
7996a778 MC |
1479 | |
1480 | spin_lock_bh(&session->lock); | |
1481 | if (session->state != ISCSI_STATE_LOGGED_IN) { | |
656cffc9 | 1482 | session->state = ISCSI_STATE_RECOVERY_FAILED; |
843c0a8a MC |
1483 | if (session->leadconn) |
1484 | wake_up(&session->leadconn->ehwait); | |
7996a778 MC |
1485 | } |
1486 | spin_unlock_bh(&session->lock); | |
1487 | } | |
1488 | EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout); | |
1489 | ||
8e124525 | 1490 | int iscsi_eh_target_reset(struct scsi_cmnd *sc) |
7996a778 | 1491 | { |
75613521 MC |
1492 | struct iscsi_cls_session *cls_session; |
1493 | struct iscsi_session *session; | |
1494 | struct iscsi_conn *conn; | |
1495 | ||
1496 | cls_session = starget_to_session(scsi_target(sc->device)); | |
1497 | session = cls_session->dd_data; | |
1498 | conn = session->leadconn; | |
7996a778 | 1499 | |
bc436b27 | 1500 | mutex_lock(&session->eh_mutex); |
7996a778 MC |
1501 | spin_lock_bh(&session->lock); |
1502 | if (session->state == ISCSI_STATE_TERMINATE) { | |
1503 | failed: | |
1b2c7af8 MC |
1504 | iscsi_session_printk(KERN_INFO, session, |
1505 | "failing target reset: Could not log " | |
1506 | "back into target [age %d]\n", | |
1507 | session->age); | |
7996a778 | 1508 | spin_unlock_bh(&session->lock); |
bc436b27 | 1509 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1510 | return FAILED; |
1511 | } | |
1512 | ||
7996a778 | 1513 | spin_unlock_bh(&session->lock); |
bc436b27 | 1514 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1515 | /* |
1516 | * we drop the lock here but the leadconn cannot be destoyed while | |
1517 | * we are in the scsi eh | |
1518 | */ | |
843c0a8a | 1519 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
7996a778 | 1520 | |
1b2c7af8 | 1521 | ISCSI_DBG_SESSION(session, "wait for relogin\n"); |
7996a778 MC |
1522 | wait_event_interruptible(conn->ehwait, |
1523 | session->state == ISCSI_STATE_TERMINATE || | |
1524 | session->state == ISCSI_STATE_LOGGED_IN || | |
656cffc9 | 1525 | session->state == ISCSI_STATE_RECOVERY_FAILED); |
7996a778 MC |
1526 | if (signal_pending(current)) |
1527 | flush_signals(current); | |
1528 | ||
bc436b27 | 1529 | mutex_lock(&session->eh_mutex); |
7996a778 MC |
1530 | spin_lock_bh(&session->lock); |
1531 | if (session->state == ISCSI_STATE_LOGGED_IN) | |
322d739d | 1532 | iscsi_session_printk(KERN_INFO, session, |
8e124525 | 1533 | "target reset succeeded\n"); |
7996a778 MC |
1534 | else |
1535 | goto failed; | |
1536 | spin_unlock_bh(&session->lock); | |
bc436b27 | 1537 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1538 | return SUCCESS; |
1539 | } | |
8e124525 | 1540 | EXPORT_SYMBOL_GPL(iscsi_eh_target_reset); |
7996a778 | 1541 | |
843c0a8a | 1542 | static void iscsi_tmf_timedout(unsigned long data) |
7996a778 | 1543 | { |
843c0a8a | 1544 | struct iscsi_conn *conn = (struct iscsi_conn *)data; |
7996a778 MC |
1545 | struct iscsi_session *session = conn->session; |
1546 | ||
1547 | spin_lock(&session->lock); | |
843c0a8a MC |
1548 | if (conn->tmf_state == TMF_QUEUED) { |
1549 | conn->tmf_state = TMF_TIMEDOUT; | |
1b2c7af8 | 1550 | ISCSI_DBG_SESSION(session, "tmf timedout\n"); |
7996a778 MC |
1551 | /* unblock eh_abort() */ |
1552 | wake_up(&conn->ehwait); | |
1553 | } | |
1554 | spin_unlock(&session->lock); | |
1555 | } | |
1556 | ||
9c19a7d0 | 1557 | static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn, |
f6d5180c MC |
1558 | struct iscsi_tm *hdr, int age, |
1559 | int timeout) | |
7996a778 | 1560 | { |
7996a778 | 1561 | struct iscsi_session *session = conn->session; |
9c19a7d0 | 1562 | struct iscsi_task *task; |
7996a778 | 1563 | |
9c19a7d0 | 1564 | task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr, |
843c0a8a | 1565 | NULL, 0); |
9c19a7d0 | 1566 | if (!task) { |
6724add1 | 1567 | spin_unlock_bh(&session->lock); |
7996a778 | 1568 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
843c0a8a | 1569 | spin_lock_bh(&session->lock); |
1b2c7af8 | 1570 | ISCSI_DBG_SESSION(session, "tmf exec failure\n"); |
77a23c21 | 1571 | return -EPERM; |
7996a778 | 1572 | } |
843c0a8a | 1573 | conn->tmfcmd_pdus_cnt++; |
f6d5180c | 1574 | conn->tmf_timer.expires = timeout * HZ + jiffies; |
843c0a8a MC |
1575 | conn->tmf_timer.function = iscsi_tmf_timedout; |
1576 | conn->tmf_timer.data = (unsigned long)conn; | |
1577 | add_timer(&conn->tmf_timer); | |
1b2c7af8 | 1578 | ISCSI_DBG_SESSION(session, "tmf set timeout\n"); |
7996a778 | 1579 | |
7996a778 | 1580 | spin_unlock_bh(&session->lock); |
6724add1 | 1581 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1582 | |
1583 | /* | |
1584 | * block eh thread until: | |
1585 | * | |
843c0a8a MC |
1586 | * 1) tmf response |
1587 | * 2) tmf timeout | |
7996a778 MC |
1588 | * 3) session is terminated or restarted or userspace has |
1589 | * given up on recovery | |
1590 | */ | |
843c0a8a | 1591 | wait_event_interruptible(conn->ehwait, age != session->age || |
7996a778 | 1592 | session->state != ISCSI_STATE_LOGGED_IN || |
843c0a8a | 1593 | conn->tmf_state != TMF_QUEUED); |
7996a778 MC |
1594 | if (signal_pending(current)) |
1595 | flush_signals(current); | |
843c0a8a MC |
1596 | del_timer_sync(&conn->tmf_timer); |
1597 | ||
6724add1 | 1598 | mutex_lock(&session->eh_mutex); |
77a23c21 | 1599 | spin_lock_bh(&session->lock); |
9c19a7d0 | 1600 | /* if the session drops it will clean up the task */ |
843c0a8a MC |
1601 | if (age != session->age || |
1602 | session->state != ISCSI_STATE_LOGGED_IN) | |
1603 | return -ENOTCONN; | |
7996a778 MC |
1604 | return 0; |
1605 | } | |
1606 | ||
843c0a8a MC |
1607 | /* |
1608 | * Fail commands. session lock held and recv side suspended and xmit | |
1609 | * thread flushed | |
1610 | */ | |
6eabafbe MC |
1611 | static void fail_all_commands(struct iscsi_conn *conn, unsigned lun, |
1612 | int error) | |
843c0a8a | 1613 | { |
9c19a7d0 | 1614 | struct iscsi_task *task, *tmp; |
843c0a8a | 1615 | |
72899682 MC |
1616 | if (conn->task) { |
1617 | if (lun == -1 || | |
1618 | (conn->task->sc && conn->task->sc->device->lun == lun)) | |
1619 | conn->task = NULL; | |
1620 | } | |
843c0a8a MC |
1621 | |
1622 | /* flush pending */ | |
9c19a7d0 MC |
1623 | list_for_each_entry_safe(task, tmp, &conn->xmitqueue, running) { |
1624 | if (lun == task->sc->device->lun || lun == -1) { | |
1b2c7af8 MC |
1625 | ISCSI_DBG_SESSION(conn->session, |
1626 | "failing pending sc %p itt 0x%x\n", | |
1627 | task->sc, task->itt); | |
9c19a7d0 | 1628 | fail_command(conn, task, error << 16); |
843c0a8a MC |
1629 | } |
1630 | } | |
1631 | ||
9c19a7d0 MC |
1632 | list_for_each_entry_safe(task, tmp, &conn->requeue, running) { |
1633 | if (lun == task->sc->device->lun || lun == -1) { | |
1b2c7af8 MC |
1634 | ISCSI_DBG_SESSION(conn->session, |
1635 | "failing requeued sc %p itt 0x%x\n", | |
1636 | task->sc, task->itt); | |
9c19a7d0 | 1637 | fail_command(conn, task, error << 16); |
843c0a8a MC |
1638 | } |
1639 | } | |
1640 | ||
1641 | /* fail all other running */ | |
9c19a7d0 MC |
1642 | list_for_each_entry_safe(task, tmp, &conn->run_list, running) { |
1643 | if (lun == task->sc->device->lun || lun == -1) { | |
1b2c7af8 MC |
1644 | ISCSI_DBG_SESSION(conn->session, |
1645 | "failing in progress sc %p itt 0x%x\n", | |
1646 | task->sc, task->itt); | |
ac26d41d | 1647 | fail_command(conn, task, error << 16); |
843c0a8a MC |
1648 | } |
1649 | } | |
1650 | } | |
1651 | ||
b40977d9 | 1652 | void iscsi_suspend_tx(struct iscsi_conn *conn) |
6724add1 | 1653 | { |
32ae763e MC |
1654 | struct Scsi_Host *shost = conn->session->host; |
1655 | struct iscsi_host *ihost = shost_priv(shost); | |
1656 | ||
6724add1 | 1657 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); |
052d0144 | 1658 | if (!(conn->session->tt->caps & CAP_DATA_PATH_OFFLOAD)) |
32ae763e | 1659 | flush_workqueue(ihost->workq); |
6724add1 | 1660 | } |
b40977d9 | 1661 | EXPORT_SYMBOL_GPL(iscsi_suspend_tx); |
6724add1 MC |
1662 | |
1663 | static void iscsi_start_tx(struct iscsi_conn *conn) | |
1664 | { | |
1665 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
052d0144 | 1666 | if (!(conn->session->tt->caps & CAP_DATA_PATH_OFFLOAD)) |
32ae763e | 1667 | iscsi_conn_queue_work(conn); |
6724add1 MC |
1668 | } |
1669 | ||
242f9dcb | 1670 | static enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *scmd) |
f6d5180c MC |
1671 | { |
1672 | struct iscsi_cls_session *cls_session; | |
1673 | struct iscsi_session *session; | |
1674 | struct iscsi_conn *conn; | |
242f9dcb | 1675 | enum blk_eh_timer_return rc = BLK_EH_NOT_HANDLED; |
f6d5180c MC |
1676 | |
1677 | cls_session = starget_to_session(scsi_target(scmd->device)); | |
75613521 | 1678 | session = cls_session->dd_data; |
f6d5180c | 1679 | |
1b2c7af8 | 1680 | ISCSI_DBG_SESSION(session, "scsi cmd %p timedout\n", scmd); |
f6d5180c MC |
1681 | |
1682 | spin_lock(&session->lock); | |
1683 | if (session->state != ISCSI_STATE_LOGGED_IN) { | |
1684 | /* | |
1685 | * We are probably in the middle of iscsi recovery so let | |
1686 | * that complete and handle the error. | |
1687 | */ | |
242f9dcb | 1688 | rc = BLK_EH_RESET_TIMER; |
f6d5180c MC |
1689 | goto done; |
1690 | } | |
1691 | ||
1692 | conn = session->leadconn; | |
1693 | if (!conn) { | |
1694 | /* In the middle of shuting down */ | |
242f9dcb | 1695 | rc = BLK_EH_RESET_TIMER; |
f6d5180c MC |
1696 | goto done; |
1697 | } | |
1698 | ||
1699 | if (!conn->recv_timeout && !conn->ping_timeout) | |
1700 | goto done; | |
1701 | /* | |
1702 | * if the ping timedout then we are in the middle of cleaning up | |
1703 | * and can let the iscsi eh handle it | |
1704 | */ | |
1705 | if (time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) + | |
1706 | (conn->ping_timeout * HZ), jiffies)) | |
242f9dcb | 1707 | rc = BLK_EH_RESET_TIMER; |
f6d5180c MC |
1708 | /* |
1709 | * if we are about to check the transport then give the command | |
1710 | * more time | |
1711 | */ | |
1712 | if (time_before_eq(conn->last_recv + (conn->recv_timeout * HZ), | |
1713 | jiffies)) | |
242f9dcb | 1714 | rc = BLK_EH_RESET_TIMER; |
f6d5180c | 1715 | /* if in the middle of checking the transport then give us more time */ |
9c19a7d0 | 1716 | if (conn->ping_task) |
242f9dcb | 1717 | rc = BLK_EH_RESET_TIMER; |
f6d5180c MC |
1718 | done: |
1719 | spin_unlock(&session->lock); | |
1b2c7af8 MC |
1720 | ISCSI_DBG_SESSION(session, "return %s\n", rc == BLK_EH_RESET_TIMER ? |
1721 | "timer reset" : "nh"); | |
f6d5180c MC |
1722 | return rc; |
1723 | } | |
1724 | ||
1725 | static void iscsi_check_transport_timeouts(unsigned long data) | |
1726 | { | |
1727 | struct iscsi_conn *conn = (struct iscsi_conn *)data; | |
1728 | struct iscsi_session *session = conn->session; | |
4cf10435 | 1729 | unsigned long recv_timeout, next_timeout = 0, last_recv; |
f6d5180c MC |
1730 | |
1731 | spin_lock(&session->lock); | |
1732 | if (session->state != ISCSI_STATE_LOGGED_IN) | |
1733 | goto done; | |
1734 | ||
4cf10435 MC |
1735 | recv_timeout = conn->recv_timeout; |
1736 | if (!recv_timeout) | |
f6d5180c MC |
1737 | goto done; |
1738 | ||
4cf10435 | 1739 | recv_timeout *= HZ; |
f6d5180c | 1740 | last_recv = conn->last_recv; |
9c19a7d0 | 1741 | if (conn->ping_task && |
4cf10435 | 1742 | time_before_eq(conn->last_ping + (conn->ping_timeout * HZ), |
f6d5180c | 1743 | jiffies)) { |
322d739d MC |
1744 | iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs " |
1745 | "expired, last rx %lu, last ping %lu, " | |
1746 | "now %lu\n", conn->ping_timeout, last_recv, | |
1747 | conn->last_ping, jiffies); | |
f6d5180c MC |
1748 | spin_unlock(&session->lock); |
1749 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1750 | return; | |
1751 | } | |
1752 | ||
4cf10435 | 1753 | if (time_before_eq(last_recv + recv_timeout, jiffies)) { |
c8611f97 | 1754 | /* send a ping to try to provoke some traffic */ |
1b2c7af8 | 1755 | ISCSI_DBG_CONN(conn, "Sending nopout as ping\n"); |
c8611f97 | 1756 | iscsi_send_nopout(conn, NULL); |
4cf10435 | 1757 | next_timeout = conn->last_ping + (conn->ping_timeout * HZ); |
ad294e9c | 1758 | } else |
4cf10435 | 1759 | next_timeout = last_recv + recv_timeout; |
f6d5180c | 1760 | |
1b2c7af8 | 1761 | ISCSI_DBG_CONN(conn, "Setting next tmo %lu\n", next_timeout); |
ad294e9c | 1762 | mod_timer(&conn->transport_timer, next_timeout); |
f6d5180c MC |
1763 | done: |
1764 | spin_unlock(&session->lock); | |
1765 | } | |
1766 | ||
9c19a7d0 | 1767 | static void iscsi_prep_abort_task_pdu(struct iscsi_task *task, |
843c0a8a MC |
1768 | struct iscsi_tm *hdr) |
1769 | { | |
1770 | memset(hdr, 0, sizeof(*hdr)); | |
1771 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
1772 | hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK; | |
1773 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
577577da MC |
1774 | memcpy(hdr->lun, task->lun, sizeof(hdr->lun)); |
1775 | hdr->rtt = task->hdr_itt; | |
1776 | hdr->refcmdsn = task->cmdsn; | |
843c0a8a MC |
1777 | } |
1778 | ||
7996a778 MC |
1779 | int iscsi_eh_abort(struct scsi_cmnd *sc) |
1780 | { | |
75613521 MC |
1781 | struct iscsi_cls_session *cls_session; |
1782 | struct iscsi_session *session; | |
f47f2cf5 | 1783 | struct iscsi_conn *conn; |
9c19a7d0 | 1784 | struct iscsi_task *task; |
843c0a8a MC |
1785 | struct iscsi_tm *hdr; |
1786 | int rc, age; | |
7996a778 | 1787 | |
75613521 MC |
1788 | cls_session = starget_to_session(scsi_target(sc->device)); |
1789 | session = cls_session->dd_data; | |
1790 | ||
6724add1 MC |
1791 | mutex_lock(&session->eh_mutex); |
1792 | spin_lock_bh(&session->lock); | |
f47f2cf5 MC |
1793 | /* |
1794 | * if session was ISCSI_STATE_IN_RECOVERY then we may not have | |
1795 | * got the command. | |
1796 | */ | |
1797 | if (!sc->SCp.ptr) { | |
1b2c7af8 MC |
1798 | ISCSI_DBG_SESSION(session, "sc never reached iscsi layer or " |
1799 | "it completed.\n"); | |
6724add1 MC |
1800 | spin_unlock_bh(&session->lock); |
1801 | mutex_unlock(&session->eh_mutex); | |
f47f2cf5 MC |
1802 | return SUCCESS; |
1803 | } | |
1804 | ||
7996a778 MC |
1805 | /* |
1806 | * If we are not logged in or we have started a new session | |
1807 | * then let the host reset code handle this | |
1808 | */ | |
843c0a8a MC |
1809 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN || |
1810 | sc->SCp.phase != session->age) { | |
1811 | spin_unlock_bh(&session->lock); | |
1812 | mutex_unlock(&session->eh_mutex); | |
1813 | return FAILED; | |
1814 | } | |
1815 | ||
1816 | conn = session->leadconn; | |
1817 | conn->eh_abort_cnt++; | |
1818 | age = session->age; | |
1819 | ||
9c19a7d0 | 1820 | task = (struct iscsi_task *)sc->SCp.ptr; |
1b2c7af8 MC |
1821 | ISCSI_DBG_SESSION(session, "aborting [sc %p itt 0x%x]\n", |
1822 | sc, task->itt); | |
7996a778 | 1823 | |
9c19a7d0 MC |
1824 | /* task completed before time out */ |
1825 | if (!task->sc) { | |
1b2c7af8 MC |
1826 | ISCSI_DBG_SESSION(session, "sc completed while abort in " |
1827 | "progress\n"); | |
77a23c21 | 1828 | goto success; |
7ea8b828 | 1829 | } |
7996a778 | 1830 | |
9c19a7d0 MC |
1831 | if (task->state == ISCSI_TASK_PENDING) { |
1832 | fail_command(conn, task, DID_ABORT << 16); | |
77a23c21 MC |
1833 | goto success; |
1834 | } | |
7996a778 | 1835 | |
843c0a8a MC |
1836 | /* only have one tmf outstanding at a time */ |
1837 | if (conn->tmf_state != TMF_INITIAL) | |
7996a778 | 1838 | goto failed; |
843c0a8a | 1839 | conn->tmf_state = TMF_QUEUED; |
7996a778 | 1840 | |
843c0a8a | 1841 | hdr = &conn->tmhdr; |
9c19a7d0 | 1842 | iscsi_prep_abort_task_pdu(task, hdr); |
843c0a8a | 1843 | |
9c19a7d0 | 1844 | if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout)) { |
843c0a8a MC |
1845 | rc = FAILED; |
1846 | goto failed; | |
1847 | } | |
1848 | ||
1849 | switch (conn->tmf_state) { | |
1850 | case TMF_SUCCESS: | |
77a23c21 | 1851 | spin_unlock_bh(&session->lock); |
913e5bf4 MC |
1852 | /* |
1853 | * stop tx side incase the target had sent a abort rsp but | |
1854 | * the initiator was still writing out data. | |
1855 | */ | |
6724add1 | 1856 | iscsi_suspend_tx(conn); |
77a23c21 | 1857 | /* |
913e5bf4 MC |
1858 | * we do not stop the recv side because targets have been |
1859 | * good and have never sent us a successful tmf response | |
1860 | * then sent more data for the cmd. | |
77a23c21 | 1861 | */ |
77a23c21 | 1862 | spin_lock(&session->lock); |
9c19a7d0 | 1863 | fail_command(conn, task, DID_ABORT << 16); |
843c0a8a | 1864 | conn->tmf_state = TMF_INITIAL; |
77a23c21 | 1865 | spin_unlock(&session->lock); |
6724add1 | 1866 | iscsi_start_tx(conn); |
77a23c21 | 1867 | goto success_unlocked; |
843c0a8a MC |
1868 | case TMF_TIMEDOUT: |
1869 | spin_unlock_bh(&session->lock); | |
1870 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1871 | goto failed_unlocked; | |
1872 | case TMF_NOT_FOUND: | |
1873 | if (!sc->SCp.ptr) { | |
1874 | conn->tmf_state = TMF_INITIAL; | |
9c19a7d0 | 1875 | /* task completed before tmf abort response */ |
1b2c7af8 MC |
1876 | ISCSI_DBG_SESSION(session, "sc completed while abort " |
1877 | "in progress\n"); | |
77a23c21 | 1878 | goto success; |
7ea8b828 MC |
1879 | } |
1880 | /* fall through */ | |
1881 | default: | |
843c0a8a MC |
1882 | conn->tmf_state = TMF_INITIAL; |
1883 | goto failed; | |
7996a778 MC |
1884 | } |
1885 | ||
77a23c21 | 1886 | success: |
7996a778 | 1887 | spin_unlock_bh(&session->lock); |
77a23c21 | 1888 | success_unlocked: |
1b2c7af8 MC |
1889 | ISCSI_DBG_SESSION(session, "abort success [sc %p itt 0x%x]\n", |
1890 | sc, task->itt); | |
6724add1 | 1891 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1892 | return SUCCESS; |
1893 | ||
1894 | failed: | |
1895 | spin_unlock_bh(&session->lock); | |
77a23c21 | 1896 | failed_unlocked: |
1b2c7af8 MC |
1897 | ISCSI_DBG_SESSION(session, "abort failed [sc %p itt 0x%x]\n", sc, |
1898 | task ? task->itt : 0); | |
6724add1 | 1899 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1900 | return FAILED; |
1901 | } | |
1902 | EXPORT_SYMBOL_GPL(iscsi_eh_abort); | |
1903 | ||
843c0a8a MC |
1904 | static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr) |
1905 | { | |
1906 | memset(hdr, 0, sizeof(*hdr)); | |
1907 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
1908 | hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK; | |
1909 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
1910 | int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun); | |
f6d5180c | 1911 | hdr->rtt = RESERVED_ITT; |
843c0a8a MC |
1912 | } |
1913 | ||
1914 | int iscsi_eh_device_reset(struct scsi_cmnd *sc) | |
1915 | { | |
75613521 MC |
1916 | struct iscsi_cls_session *cls_session; |
1917 | struct iscsi_session *session; | |
843c0a8a MC |
1918 | struct iscsi_conn *conn; |
1919 | struct iscsi_tm *hdr; | |
1920 | int rc = FAILED; | |
1921 | ||
75613521 MC |
1922 | cls_session = starget_to_session(scsi_target(sc->device)); |
1923 | session = cls_session->dd_data; | |
1924 | ||
1b2c7af8 MC |
1925 | ISCSI_DBG_SESSION(session, "LU Reset [sc %p lun %u]\n", |
1926 | sc, sc->device->lun); | |
843c0a8a MC |
1927 | |
1928 | mutex_lock(&session->eh_mutex); | |
1929 | spin_lock_bh(&session->lock); | |
1930 | /* | |
1931 | * Just check if we are not logged in. We cannot check for | |
1932 | * the phase because the reset could come from a ioctl. | |
1933 | */ | |
1934 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN) | |
1935 | goto unlock; | |
1936 | conn = session->leadconn; | |
1937 | ||
1938 | /* only have one tmf outstanding at a time */ | |
1939 | if (conn->tmf_state != TMF_INITIAL) | |
1940 | goto unlock; | |
1941 | conn->tmf_state = TMF_QUEUED; | |
1942 | ||
1943 | hdr = &conn->tmhdr; | |
1944 | iscsi_prep_lun_reset_pdu(sc, hdr); | |
1945 | ||
9c19a7d0 | 1946 | if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age, |
f6d5180c | 1947 | session->lu_reset_timeout)) { |
843c0a8a MC |
1948 | rc = FAILED; |
1949 | goto unlock; | |
1950 | } | |
1951 | ||
1952 | switch (conn->tmf_state) { | |
1953 | case TMF_SUCCESS: | |
1954 | break; | |
1955 | case TMF_TIMEDOUT: | |
1956 | spin_unlock_bh(&session->lock); | |
1957 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1958 | goto done; | |
1959 | default: | |
1960 | conn->tmf_state = TMF_INITIAL; | |
1961 | goto unlock; | |
1962 | } | |
1963 | ||
1964 | rc = SUCCESS; | |
1965 | spin_unlock_bh(&session->lock); | |
1966 | ||
1967 | iscsi_suspend_tx(conn); | |
913e5bf4 | 1968 | |
a3439148 | 1969 | spin_lock_bh(&session->lock); |
6eabafbe | 1970 | fail_all_commands(conn, sc->device->lun, DID_ERROR); |
843c0a8a | 1971 | conn->tmf_state = TMF_INITIAL; |
a3439148 | 1972 | spin_unlock_bh(&session->lock); |
843c0a8a MC |
1973 | |
1974 | iscsi_start_tx(conn); | |
1975 | goto done; | |
1976 | ||
1977 | unlock: | |
1978 | spin_unlock_bh(&session->lock); | |
1979 | done: | |
1b2c7af8 MC |
1980 | ISCSI_DBG_SESSION(session, "dev reset result = %s\n", |
1981 | rc == SUCCESS ? "SUCCESS" : "FAILED"); | |
843c0a8a MC |
1982 | mutex_unlock(&session->eh_mutex); |
1983 | return rc; | |
1984 | } | |
1985 | EXPORT_SYMBOL_GPL(iscsi_eh_device_reset); | |
1986 | ||
6320377f OK |
1987 | /* |
1988 | * Pre-allocate a pool of @max items of @item_size. By default, the pool | |
1989 | * should be accessed via kfifo_{get,put} on q->queue. | |
1990 | * Optionally, the caller can obtain the array of object pointers | |
1991 | * by passing in a non-NULL @items pointer | |
1992 | */ | |
7996a778 | 1993 | int |
6320377f | 1994 | iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size) |
7996a778 | 1995 | { |
6320377f | 1996 | int i, num_arrays = 1; |
7996a778 | 1997 | |
6320377f | 1998 | memset(q, 0, sizeof(*q)); |
7996a778 MC |
1999 | |
2000 | q->max = max; | |
6320377f OK |
2001 | |
2002 | /* If the user passed an items pointer, he wants a copy of | |
2003 | * the array. */ | |
2004 | if (items) | |
2005 | num_arrays++; | |
2006 | q->pool = kzalloc(num_arrays * max * sizeof(void*), GFP_KERNEL); | |
2007 | if (q->pool == NULL) | |
f474a37b | 2008 | return -ENOMEM; |
7996a778 MC |
2009 | |
2010 | q->queue = kfifo_init((void*)q->pool, max * sizeof(void*), | |
2011 | GFP_KERNEL, NULL); | |
fd6e1c14 JD |
2012 | if (IS_ERR(q->queue)) { |
2013 | q->queue = NULL; | |
6320377f | 2014 | goto enomem; |
fd6e1c14 | 2015 | } |
7996a778 MC |
2016 | |
2017 | for (i = 0; i < max; i++) { | |
6320377f | 2018 | q->pool[i] = kzalloc(item_size, GFP_KERNEL); |
7996a778 | 2019 | if (q->pool[i] == NULL) { |
6320377f OK |
2020 | q->max = i; |
2021 | goto enomem; | |
7996a778 | 2022 | } |
7996a778 MC |
2023 | __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*)); |
2024 | } | |
6320377f OK |
2025 | |
2026 | if (items) { | |
2027 | *items = q->pool + max; | |
2028 | memcpy(*items, q->pool, max * sizeof(void *)); | |
2029 | } | |
2030 | ||
7996a778 | 2031 | return 0; |
6320377f OK |
2032 | |
2033 | enomem: | |
2034 | iscsi_pool_free(q); | |
2035 | return -ENOMEM; | |
7996a778 MC |
2036 | } |
2037 | EXPORT_SYMBOL_GPL(iscsi_pool_init); | |
2038 | ||
6320377f | 2039 | void iscsi_pool_free(struct iscsi_pool *q) |
7996a778 MC |
2040 | { |
2041 | int i; | |
2042 | ||
2043 | for (i = 0; i < q->max; i++) | |
6320377f | 2044 | kfree(q->pool[i]); |
f474a37b | 2045 | kfree(q->pool); |
2f5899a3 | 2046 | kfree(q->queue); |
7996a778 MC |
2047 | } |
2048 | EXPORT_SYMBOL_GPL(iscsi_pool_free); | |
2049 | ||
a4804cd6 MC |
2050 | /** |
2051 | * iscsi_host_add - add host to system | |
2052 | * @shost: scsi host | |
2053 | * @pdev: parent device | |
2054 | * | |
2055 | * This should be called by partial offload and software iscsi drivers | |
2056 | * to add a host to the system. | |
2057 | */ | |
2058 | int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev) | |
2059 | { | |
8e9a20ce MC |
2060 | if (!shost->can_queue) |
2061 | shost->can_queue = ISCSI_DEF_XMIT_CMDS_MAX; | |
2062 | ||
4d108350 MC |
2063 | if (!shost->cmd_per_lun) |
2064 | shost->cmd_per_lun = ISCSI_DEF_CMD_PER_LUN; | |
2065 | ||
308cec14 MC |
2066 | if (!shost->transportt->eh_timed_out) |
2067 | shost->transportt->eh_timed_out = iscsi_eh_cmd_timed_out; | |
a4804cd6 MC |
2068 | return scsi_add_host(shost, pdev); |
2069 | } | |
2070 | EXPORT_SYMBOL_GPL(iscsi_host_add); | |
2071 | ||
2072 | /** | |
2073 | * iscsi_host_alloc - allocate a host and driver data | |
2074 | * @sht: scsi host template | |
2075 | * @dd_data_size: driver host data size | |
32ae763e | 2076 | * @xmit_can_sleep: bool indicating if LLD will queue IO from a work queue |
a4804cd6 MC |
2077 | * |
2078 | * This should be called by partial offload and software iscsi drivers. | |
2079 | * To access the driver specific memory use the iscsi_host_priv() macro. | |
2080 | */ | |
2081 | struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht, | |
4d108350 | 2082 | int dd_data_size, bool xmit_can_sleep) |
75613521 | 2083 | { |
a4804cd6 | 2084 | struct Scsi_Host *shost; |
e5bd7b54 | 2085 | struct iscsi_host *ihost; |
a4804cd6 MC |
2086 | |
2087 | shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size); | |
2088 | if (!shost) | |
2089 | return NULL; | |
e5bd7b54 | 2090 | ihost = shost_priv(shost); |
32ae763e MC |
2091 | |
2092 | if (xmit_can_sleep) { | |
2093 | snprintf(ihost->workq_name, sizeof(ihost->workq_name), | |
2094 | "iscsi_q_%d", shost->host_no); | |
2095 | ihost->workq = create_singlethread_workqueue(ihost->workq_name); | |
2096 | if (!ihost->workq) | |
2097 | goto free_host; | |
2098 | } | |
2099 | ||
e5bd7b54 MC |
2100 | spin_lock_init(&ihost->lock); |
2101 | ihost->state = ISCSI_HOST_SETUP; | |
2102 | ihost->num_sessions = 0; | |
2103 | init_waitqueue_head(&ihost->session_removal_wq); | |
a4804cd6 | 2104 | return shost; |
32ae763e MC |
2105 | |
2106 | free_host: | |
2107 | scsi_host_put(shost); | |
2108 | return NULL; | |
a4804cd6 MC |
2109 | } |
2110 | EXPORT_SYMBOL_GPL(iscsi_host_alloc); | |
2111 | ||
e5bd7b54 MC |
2112 | static void iscsi_notify_host_removed(struct iscsi_cls_session *cls_session) |
2113 | { | |
40a06e75 | 2114 | iscsi_session_failure(cls_session->dd_data, ISCSI_ERR_INVALID_HOST); |
e5bd7b54 MC |
2115 | } |
2116 | ||
a4804cd6 MC |
2117 | /** |
2118 | * iscsi_host_remove - remove host and sessions | |
2119 | * @shost: scsi host | |
2120 | * | |
e5bd7b54 MC |
2121 | * If there are any sessions left, this will initiate the removal and wait |
2122 | * for the completion. | |
a4804cd6 MC |
2123 | */ |
2124 | void iscsi_host_remove(struct Scsi_Host *shost) | |
2125 | { | |
e5bd7b54 MC |
2126 | struct iscsi_host *ihost = shost_priv(shost); |
2127 | unsigned long flags; | |
2128 | ||
2129 | spin_lock_irqsave(&ihost->lock, flags); | |
2130 | ihost->state = ISCSI_HOST_REMOVED; | |
2131 | spin_unlock_irqrestore(&ihost->lock, flags); | |
2132 | ||
2133 | iscsi_host_for_each_session(shost, iscsi_notify_host_removed); | |
2134 | wait_event_interruptible(ihost->session_removal_wq, | |
2135 | ihost->num_sessions == 0); | |
2136 | if (signal_pending(current)) | |
2137 | flush_signals(current); | |
2138 | ||
a4804cd6 | 2139 | scsi_remove_host(shost); |
32ae763e MC |
2140 | if (ihost->workq) |
2141 | destroy_workqueue(ihost->workq); | |
75613521 | 2142 | } |
a4804cd6 | 2143 | EXPORT_SYMBOL_GPL(iscsi_host_remove); |
7996a778 | 2144 | |
a4804cd6 | 2145 | void iscsi_host_free(struct Scsi_Host *shost) |
75613521 MC |
2146 | { |
2147 | struct iscsi_host *ihost = shost_priv(shost); | |
7996a778 | 2148 | |
75613521 MC |
2149 | kfree(ihost->netdev); |
2150 | kfree(ihost->hwaddress); | |
2151 | kfree(ihost->initiatorname); | |
a4804cd6 | 2152 | scsi_host_put(shost); |
75613521 | 2153 | } |
a4804cd6 | 2154 | EXPORT_SYMBOL_GPL(iscsi_host_free); |
7996a778 | 2155 | |
e5bd7b54 MC |
2156 | static void iscsi_host_dec_session_cnt(struct Scsi_Host *shost) |
2157 | { | |
2158 | struct iscsi_host *ihost = shost_priv(shost); | |
2159 | unsigned long flags; | |
2160 | ||
2161 | shost = scsi_host_get(shost); | |
2162 | if (!shost) { | |
2163 | printk(KERN_ERR "Invalid state. Cannot notify host removal " | |
2164 | "of session teardown event because host already " | |
2165 | "removed.\n"); | |
2166 | return; | |
2167 | } | |
2168 | ||
2169 | spin_lock_irqsave(&ihost->lock, flags); | |
2170 | ihost->num_sessions--; | |
2171 | if (ihost->num_sessions == 0) | |
2172 | wake_up(&ihost->session_removal_wq); | |
2173 | spin_unlock_irqrestore(&ihost->lock, flags); | |
2174 | scsi_host_put(shost); | |
2175 | } | |
2176 | ||
7996a778 MC |
2177 | /** |
2178 | * iscsi_session_setup - create iscsi cls session and host and session | |
7996a778 | 2179 | * @iscsit: iscsi transport template |
75613521 MC |
2180 | * @shost: scsi host |
2181 | * @cmds_max: session can queue | |
9c19a7d0 | 2182 | * @cmd_task_size: LLD task private data size |
7996a778 | 2183 | * @initial_cmdsn: initial CmdSN |
7996a778 MC |
2184 | * |
2185 | * This can be used by software iscsi_transports that allocate | |
2186 | * a session per scsi host. | |
3cf7b233 MC |
2187 | * |
2188 | * Callers should set cmds_max to the largest total numer (mgmt + scsi) of | |
2189 | * tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks | |
2190 | * for nop handling and login/logout requests. | |
75613521 | 2191 | */ |
7996a778 | 2192 | struct iscsi_cls_session * |
75613521 | 2193 | iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost, |
3cf7b233 | 2194 | uint16_t cmds_max, int cmd_task_size, |
7970634b | 2195 | uint32_t initial_cmdsn, unsigned int id) |
7996a778 | 2196 | { |
e5bd7b54 | 2197 | struct iscsi_host *ihost = shost_priv(shost); |
7996a778 MC |
2198 | struct iscsi_session *session; |
2199 | struct iscsi_cls_session *cls_session; | |
3cf7b233 | 2200 | int cmd_i, scsi_cmds, total_cmds = cmds_max; |
e5bd7b54 MC |
2201 | unsigned long flags; |
2202 | ||
2203 | spin_lock_irqsave(&ihost->lock, flags); | |
2204 | if (ihost->state == ISCSI_HOST_REMOVED) { | |
2205 | spin_unlock_irqrestore(&ihost->lock, flags); | |
2206 | return NULL; | |
2207 | } | |
2208 | ihost->num_sessions++; | |
2209 | spin_unlock_irqrestore(&ihost->lock, flags); | |
8e9a20ce MC |
2210 | |
2211 | if (!total_cmds) | |
2212 | total_cmds = ISCSI_DEF_XMIT_CMDS_MAX; | |
3e5c28ad | 2213 | /* |
3cf7b233 MC |
2214 | * The iscsi layer needs some tasks for nop handling and tmfs, |
2215 | * so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX | |
2216 | * + 1 command for scsi IO. | |
3e5c28ad | 2217 | */ |
3cf7b233 MC |
2218 | if (total_cmds < ISCSI_TOTAL_CMDS_MIN) { |
2219 | printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " | |
2220 | "must be a power of two that is at least %d.\n", | |
2221 | total_cmds, ISCSI_TOTAL_CMDS_MIN); | |
e5bd7b54 | 2222 | goto dec_session_count; |
3cf7b233 MC |
2223 | } |
2224 | ||
2225 | if (total_cmds > ISCSI_TOTAL_CMDS_MAX) { | |
2226 | printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " | |
2227 | "must be a power of 2 less than or equal to %d.\n", | |
2228 | cmds_max, ISCSI_TOTAL_CMDS_MAX); | |
2229 | total_cmds = ISCSI_TOTAL_CMDS_MAX; | |
2230 | } | |
2231 | ||
2232 | if (!is_power_of_2(total_cmds)) { | |
2233 | printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " | |
2234 | "must be a power of 2.\n", total_cmds); | |
2235 | total_cmds = rounddown_pow_of_two(total_cmds); | |
2236 | if (total_cmds < ISCSI_TOTAL_CMDS_MIN) | |
2237 | return NULL; | |
2238 | printk(KERN_INFO "iscsi: Rounding can_queue to %d.\n", | |
2239 | total_cmds); | |
1548271e | 2240 | } |
3cf7b233 | 2241 | scsi_cmds = total_cmds - ISCSI_MGMT_CMDS_MAX; |
1548271e | 2242 | |
5d91e209 MC |
2243 | cls_session = iscsi_alloc_session(shost, iscsit, |
2244 | sizeof(struct iscsi_session)); | |
75613521 | 2245 | if (!cls_session) |
e5bd7b54 | 2246 | goto dec_session_count; |
75613521 MC |
2247 | session = cls_session->dd_data; |
2248 | session->cls_session = cls_session; | |
7996a778 MC |
2249 | session->host = shost; |
2250 | session->state = ISCSI_STATE_FREE; | |
f6d5180c | 2251 | session->fast_abort = 1; |
4cd49ea1 MC |
2252 | session->lu_reset_timeout = 15; |
2253 | session->abort_timeout = 10; | |
3cf7b233 MC |
2254 | session->scsi_cmds_max = scsi_cmds; |
2255 | session->cmds_max = total_cmds; | |
e0726407 | 2256 | session->queued_cmdsn = session->cmdsn = initial_cmdsn; |
7996a778 MC |
2257 | session->exp_cmdsn = initial_cmdsn + 1; |
2258 | session->max_cmdsn = initial_cmdsn + 1; | |
2259 | session->max_r2t = 1; | |
2260 | session->tt = iscsit; | |
6724add1 | 2261 | mutex_init(&session->eh_mutex); |
75613521 | 2262 | spin_lock_init(&session->lock); |
7996a778 MC |
2263 | |
2264 | /* initialize SCSI PDU commands pool */ | |
2265 | if (iscsi_pool_init(&session->cmdpool, session->cmds_max, | |
2266 | (void***)&session->cmds, | |
9c19a7d0 | 2267 | cmd_task_size + sizeof(struct iscsi_task))) |
7996a778 MC |
2268 | goto cmdpool_alloc_fail; |
2269 | ||
2270 | /* pre-format cmds pool with ITT */ | |
2271 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
9c19a7d0 | 2272 | struct iscsi_task *task = session->cmds[cmd_i]; |
7996a778 | 2273 | |
9c19a7d0 MC |
2274 | if (cmd_task_size) |
2275 | task->dd_data = &task[1]; | |
2276 | task->itt = cmd_i; | |
2277 | INIT_LIST_HEAD(&task->running); | |
7996a778 MC |
2278 | } |
2279 | ||
f53a88da | 2280 | if (!try_module_get(iscsit->owner)) |
75613521 | 2281 | goto module_get_fail; |
7996a778 | 2282 | |
7970634b | 2283 | if (iscsi_add_session(cls_session, id)) |
75613521 | 2284 | goto cls_session_fail; |
e5bd7b54 | 2285 | |
7996a778 MC |
2286 | return cls_session; |
2287 | ||
2288 | cls_session_fail: | |
75613521 MC |
2289 | module_put(iscsit->owner); |
2290 | module_get_fail: | |
6320377f | 2291 | iscsi_pool_free(&session->cmdpool); |
7996a778 | 2292 | cmdpool_alloc_fail: |
75613521 | 2293 | iscsi_free_session(cls_session); |
e5bd7b54 MC |
2294 | dec_session_count: |
2295 | iscsi_host_dec_session_cnt(shost); | |
7996a778 MC |
2296 | return NULL; |
2297 | } | |
2298 | EXPORT_SYMBOL_GPL(iscsi_session_setup); | |
2299 | ||
2300 | /** | |
2301 | * iscsi_session_teardown - destroy session, host, and cls_session | |
75613521 | 2302 | * @cls_session: iscsi session |
7996a778 | 2303 | * |
75613521 MC |
2304 | * The driver must have called iscsi_remove_session before |
2305 | * calling this. | |
2306 | */ | |
7996a778 MC |
2307 | void iscsi_session_teardown(struct iscsi_cls_session *cls_session) |
2308 | { | |
75613521 | 2309 | struct iscsi_session *session = cls_session->dd_data; |
63f75cc8 | 2310 | struct module *owner = cls_session->transport->owner; |
e5bd7b54 | 2311 | struct Scsi_Host *shost = session->host; |
7996a778 | 2312 | |
6320377f | 2313 | iscsi_pool_free(&session->cmdpool); |
7996a778 | 2314 | |
b2c64167 MC |
2315 | kfree(session->password); |
2316 | kfree(session->password_in); | |
2317 | kfree(session->username); | |
2318 | kfree(session->username_in); | |
f3ff0c36 | 2319 | kfree(session->targetname); |
88dfd340 MC |
2320 | kfree(session->initiatorname); |
2321 | kfree(session->ifacename); | |
f3ff0c36 | 2322 | |
75613521 | 2323 | iscsi_destroy_session(cls_session); |
e5bd7b54 | 2324 | iscsi_host_dec_session_cnt(shost); |
63f75cc8 | 2325 | module_put(owner); |
7996a778 MC |
2326 | } |
2327 | EXPORT_SYMBOL_GPL(iscsi_session_teardown); | |
2328 | ||
2329 | /** | |
2330 | * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn | |
2331 | * @cls_session: iscsi_cls_session | |
5d91e209 | 2332 | * @dd_size: private driver data size |
7996a778 | 2333 | * @conn_idx: cid |
5d91e209 | 2334 | */ |
7996a778 | 2335 | struct iscsi_cls_conn * |
5d91e209 MC |
2336 | iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size, |
2337 | uint32_t conn_idx) | |
7996a778 | 2338 | { |
75613521 | 2339 | struct iscsi_session *session = cls_session->dd_data; |
7996a778 MC |
2340 | struct iscsi_conn *conn; |
2341 | struct iscsi_cls_conn *cls_conn; | |
d36ab6f3 | 2342 | char *data; |
7996a778 | 2343 | |
5d91e209 MC |
2344 | cls_conn = iscsi_create_conn(cls_session, sizeof(*conn) + dd_size, |
2345 | conn_idx); | |
7996a778 MC |
2346 | if (!cls_conn) |
2347 | return NULL; | |
2348 | conn = cls_conn->dd_data; | |
5d91e209 | 2349 | memset(conn, 0, sizeof(*conn) + dd_size); |
7996a778 | 2350 | |
5d91e209 | 2351 | conn->dd_data = cls_conn->dd_data + sizeof(*conn); |
7996a778 MC |
2352 | conn->session = session; |
2353 | conn->cls_conn = cls_conn; | |
2354 | conn->c_stage = ISCSI_CONN_INITIAL_STAGE; | |
2355 | conn->id = conn_idx; | |
2356 | conn->exp_statsn = 0; | |
843c0a8a | 2357 | conn->tmf_state = TMF_INITIAL; |
f6d5180c MC |
2358 | |
2359 | init_timer(&conn->transport_timer); | |
2360 | conn->transport_timer.data = (unsigned long)conn; | |
2361 | conn->transport_timer.function = iscsi_check_transport_timeouts; | |
2362 | ||
7996a778 MC |
2363 | INIT_LIST_HEAD(&conn->run_list); |
2364 | INIT_LIST_HEAD(&conn->mgmt_run_list); | |
843c0a8a | 2365 | INIT_LIST_HEAD(&conn->mgmtqueue); |
b6c395ed | 2366 | INIT_LIST_HEAD(&conn->xmitqueue); |
843c0a8a | 2367 | INIT_LIST_HEAD(&conn->requeue); |
c4028958 | 2368 | INIT_WORK(&conn->xmitwork, iscsi_xmitworker); |
7996a778 | 2369 | |
9c19a7d0 | 2370 | /* allocate login_task used for the login/text sequences */ |
7996a778 | 2371 | spin_lock_bh(&session->lock); |
3e5c28ad | 2372 | if (!__kfifo_get(session->cmdpool.queue, |
9c19a7d0 | 2373 | (void*)&conn->login_task, |
7996a778 MC |
2374 | sizeof(void*))) { |
2375 | spin_unlock_bh(&session->lock); | |
9c19a7d0 | 2376 | goto login_task_alloc_fail; |
7996a778 MC |
2377 | } |
2378 | spin_unlock_bh(&session->lock); | |
2379 | ||
cfeb2cf9 MC |
2380 | data = (char *) __get_free_pages(GFP_KERNEL, |
2381 | get_order(ISCSI_DEF_MAX_RECV_SEG_LEN)); | |
d36ab6f3 | 2382 | if (!data) |
9c19a7d0 MC |
2383 | goto login_task_data_alloc_fail; |
2384 | conn->login_task->data = conn->data = data; | |
d36ab6f3 | 2385 | |
843c0a8a | 2386 | init_timer(&conn->tmf_timer); |
7996a778 MC |
2387 | init_waitqueue_head(&conn->ehwait); |
2388 | ||
2389 | return cls_conn; | |
2390 | ||
9c19a7d0 MC |
2391 | login_task_data_alloc_fail: |
2392 | __kfifo_put(session->cmdpool.queue, (void*)&conn->login_task, | |
d36ab6f3 | 2393 | sizeof(void*)); |
9c19a7d0 | 2394 | login_task_alloc_fail: |
7996a778 MC |
2395 | iscsi_destroy_conn(cls_conn); |
2396 | return NULL; | |
2397 | } | |
2398 | EXPORT_SYMBOL_GPL(iscsi_conn_setup); | |
2399 | ||
2400 | /** | |
2401 | * iscsi_conn_teardown - teardown iscsi connection | |
2402 | * cls_conn: iscsi class connection | |
2403 | * | |
2404 | * TODO: we may need to make this into a two step process | |
2405 | * like scsi-mls remove + put host | |
2406 | */ | |
2407 | void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn) | |
2408 | { | |
2409 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2410 | struct iscsi_session *session = conn->session; | |
2411 | unsigned long flags; | |
2412 | ||
f6d5180c MC |
2413 | del_timer_sync(&conn->transport_timer); |
2414 | ||
7996a778 MC |
2415 | spin_lock_bh(&session->lock); |
2416 | conn->c_stage = ISCSI_CONN_CLEANUP_WAIT; | |
2417 | if (session->leadconn == conn) { | |
2418 | /* | |
2419 | * leading connection? then give up on recovery. | |
2420 | */ | |
2421 | session->state = ISCSI_STATE_TERMINATE; | |
2422 | wake_up(&conn->ehwait); | |
2423 | } | |
2424 | spin_unlock_bh(&session->lock); | |
2425 | ||
7996a778 MC |
2426 | /* |
2427 | * Block until all in-progress commands for this connection | |
2428 | * time out or fail. | |
2429 | */ | |
2430 | for (;;) { | |
2431 | spin_lock_irqsave(session->host->host_lock, flags); | |
2432 | if (!session->host->host_busy) { /* OK for ERL == 0 */ | |
2433 | spin_unlock_irqrestore(session->host->host_lock, flags); | |
2434 | break; | |
2435 | } | |
2436 | spin_unlock_irqrestore(session->host->host_lock, flags); | |
2437 | msleep_interruptible(500); | |
322d739d MC |
2438 | iscsi_conn_printk(KERN_INFO, conn, "iscsi conn_destroy(): " |
2439 | "host_busy %d host_failed %d\n", | |
2440 | session->host->host_busy, | |
2441 | session->host->host_failed); | |
7996a778 MC |
2442 | /* |
2443 | * force eh_abort() to unblock | |
2444 | */ | |
2445 | wake_up(&conn->ehwait); | |
2446 | } | |
2447 | ||
779ea120 | 2448 | /* flush queued up work because we free the connection below */ |
843c0a8a | 2449 | iscsi_suspend_tx(conn); |
779ea120 | 2450 | |
7996a778 | 2451 | spin_lock_bh(&session->lock); |
cfeb2cf9 MC |
2452 | free_pages((unsigned long) conn->data, |
2453 | get_order(ISCSI_DEF_MAX_RECV_SEG_LEN)); | |
f3ff0c36 | 2454 | kfree(conn->persistent_address); |
9c19a7d0 | 2455 | __kfifo_put(session->cmdpool.queue, (void*)&conn->login_task, |
7996a778 | 2456 | sizeof(void*)); |
e0726407 | 2457 | if (session->leadconn == conn) |
7996a778 | 2458 | session->leadconn = NULL; |
7996a778 MC |
2459 | spin_unlock_bh(&session->lock); |
2460 | ||
7996a778 MC |
2461 | iscsi_destroy_conn(cls_conn); |
2462 | } | |
2463 | EXPORT_SYMBOL_GPL(iscsi_conn_teardown); | |
2464 | ||
2465 | int iscsi_conn_start(struct iscsi_cls_conn *cls_conn) | |
2466 | { | |
2467 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2468 | struct iscsi_session *session = conn->session; | |
2469 | ||
ffd0436e | 2470 | if (!session) { |
322d739d MC |
2471 | iscsi_conn_printk(KERN_ERR, conn, |
2472 | "can't start unbound connection\n"); | |
7996a778 MC |
2473 | return -EPERM; |
2474 | } | |
2475 | ||
db98ccde MC |
2476 | if ((session->imm_data_en || !session->initial_r2t_en) && |
2477 | session->first_burst > session->max_burst) { | |
322d739d MC |
2478 | iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: " |
2479 | "first_burst %d max_burst %d\n", | |
2480 | session->first_burst, session->max_burst); | |
ffd0436e MC |
2481 | return -EINVAL; |
2482 | } | |
2483 | ||
f6d5180c | 2484 | if (conn->ping_timeout && !conn->recv_timeout) { |
322d739d MC |
2485 | iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of " |
2486 | "zero. Using 5 seconds\n."); | |
f6d5180c MC |
2487 | conn->recv_timeout = 5; |
2488 | } | |
2489 | ||
2490 | if (conn->recv_timeout && !conn->ping_timeout) { | |
322d739d MC |
2491 | iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of " |
2492 | "zero. Using 5 seconds.\n"); | |
f6d5180c MC |
2493 | conn->ping_timeout = 5; |
2494 | } | |
2495 | ||
7996a778 MC |
2496 | spin_lock_bh(&session->lock); |
2497 | conn->c_stage = ISCSI_CONN_STARTED; | |
2498 | session->state = ISCSI_STATE_LOGGED_IN; | |
e0726407 | 2499 | session->queued_cmdsn = session->cmdsn; |
7996a778 | 2500 | |
f6d5180c MC |
2501 | conn->last_recv = jiffies; |
2502 | conn->last_ping = jiffies; | |
2503 | if (conn->recv_timeout && conn->ping_timeout) | |
2504 | mod_timer(&conn->transport_timer, | |
2505 | jiffies + (conn->recv_timeout * HZ)); | |
2506 | ||
7996a778 MC |
2507 | switch(conn->stop_stage) { |
2508 | case STOP_CONN_RECOVER: | |
2509 | /* | |
2510 | * unblock eh_abort() if it is blocked. re-try all | |
2511 | * commands after successful recovery | |
2512 | */ | |
7996a778 | 2513 | conn->stop_stage = 0; |
843c0a8a | 2514 | conn->tmf_state = TMF_INITIAL; |
7996a778 | 2515 | session->age++; |
8b1d0343 MC |
2516 | if (session->age == 16) |
2517 | session->age = 0; | |
6eabafbe | 2518 | break; |
7996a778 | 2519 | case STOP_CONN_TERM: |
7996a778 | 2520 | conn->stop_stage = 0; |
7996a778 MC |
2521 | break; |
2522 | default: | |
2523 | break; | |
2524 | } | |
2525 | spin_unlock_bh(&session->lock); | |
2526 | ||
75613521 | 2527 | iscsi_unblock_session(session->cls_session); |
6eabafbe | 2528 | wake_up(&conn->ehwait); |
7996a778 MC |
2529 | return 0; |
2530 | } | |
2531 | EXPORT_SYMBOL_GPL(iscsi_conn_start); | |
2532 | ||
2533 | static void | |
2534 | flush_control_queues(struct iscsi_session *session, struct iscsi_conn *conn) | |
2535 | { | |
9c19a7d0 | 2536 | struct iscsi_task *task, *tmp; |
7996a778 MC |
2537 | |
2538 | /* handle pending */ | |
9c19a7d0 | 2539 | list_for_each_entry_safe(task, tmp, &conn->mgmtqueue, running) { |
1b2c7af8 MC |
2540 | ISCSI_DBG_SESSION(session, "flushing pending mgmt task " |
2541 | "itt 0x%x\n", task->itt); | |
9c19a7d0 MC |
2542 | /* release ref from prep task */ |
2543 | __iscsi_put_task(task); | |
7996a778 MC |
2544 | } |
2545 | ||
2546 | /* handle running */ | |
9c19a7d0 | 2547 | list_for_each_entry_safe(task, tmp, &conn->mgmt_run_list, running) { |
1b2c7af8 MC |
2548 | ISCSI_DBG_SESSION(session, "flushing running mgmt task " |
2549 | "itt 0x%x\n", task->itt); | |
9c19a7d0 MC |
2550 | /* release ref from prep task */ |
2551 | __iscsi_put_task(task); | |
7996a778 MC |
2552 | } |
2553 | ||
9c19a7d0 | 2554 | conn->task = NULL; |
7996a778 MC |
2555 | } |
2556 | ||
656cffc9 MC |
2557 | static void iscsi_start_session_recovery(struct iscsi_session *session, |
2558 | struct iscsi_conn *conn, int flag) | |
7996a778 | 2559 | { |
ed2abc7f MC |
2560 | int old_stop_stage; |
2561 | ||
f6d5180c MC |
2562 | del_timer_sync(&conn->transport_timer); |
2563 | ||
6724add1 | 2564 | mutex_lock(&session->eh_mutex); |
7996a778 | 2565 | spin_lock_bh(&session->lock); |
ed2abc7f | 2566 | if (conn->stop_stage == STOP_CONN_TERM) { |
7996a778 | 2567 | spin_unlock_bh(&session->lock); |
6724add1 MC |
2568 | mutex_unlock(&session->eh_mutex); |
2569 | return; | |
2570 | } | |
2571 | ||
ed2abc7f MC |
2572 | /* |
2573 | * When this is called for the in_login state, we only want to clean | |
9c19a7d0 | 2574 | * up the login task and connection. We do not need to block and set |
67a61114 | 2575 | * the recovery state again |
ed2abc7f | 2576 | */ |
67a61114 MC |
2577 | if (flag == STOP_CONN_TERM) |
2578 | session->state = ISCSI_STATE_TERMINATE; | |
2579 | else if (conn->stop_stage != STOP_CONN_RECOVER) | |
2580 | session->state = ISCSI_STATE_IN_RECOVERY; | |
ed2abc7f MC |
2581 | |
2582 | old_stop_stage = conn->stop_stage; | |
7996a778 | 2583 | conn->stop_stage = flag; |
67a61114 | 2584 | conn->c_stage = ISCSI_CONN_STOPPED; |
7996a778 | 2585 | spin_unlock_bh(&session->lock); |
6724add1 MC |
2586 | |
2587 | iscsi_suspend_tx(conn); | |
7996a778 MC |
2588 | /* |
2589 | * for connection level recovery we should not calculate | |
2590 | * header digest. conn->hdr_size used for optimization | |
2591 | * in hdr_extract() and will be re-negotiated at | |
2592 | * set_param() time. | |
2593 | */ | |
2594 | if (flag == STOP_CONN_RECOVER) { | |
2595 | conn->hdrdgst_en = 0; | |
2596 | conn->datadgst_en = 0; | |
656cffc9 | 2597 | if (session->state == ISCSI_STATE_IN_RECOVERY && |
67a61114 | 2598 | old_stop_stage != STOP_CONN_RECOVER) { |
1b2c7af8 | 2599 | ISCSI_DBG_SESSION(session, "blocking session\n"); |
75613521 | 2600 | iscsi_block_session(session->cls_session); |
67a61114 | 2601 | } |
7996a778 | 2602 | } |
656cffc9 | 2603 | |
656cffc9 MC |
2604 | /* |
2605 | * flush queues. | |
2606 | */ | |
2607 | spin_lock_bh(&session->lock); | |
87cd9eab | 2608 | if (flag == STOP_CONN_RECOVER) |
56d7fcfa MC |
2609 | fail_all_commands(conn, -1, DID_TRANSPORT_DISRUPTED); |
2610 | else | |
2611 | fail_all_commands(conn, -1, DID_ERROR); | |
656cffc9 MC |
2612 | flush_control_queues(session, conn); |
2613 | spin_unlock_bh(&session->lock); | |
6724add1 | 2614 | mutex_unlock(&session->eh_mutex); |
7996a778 | 2615 | } |
7996a778 MC |
2616 | |
2617 | void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) | |
2618 | { | |
2619 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2620 | struct iscsi_session *session = conn->session; | |
2621 | ||
2622 | switch (flag) { | |
2623 | case STOP_CONN_RECOVER: | |
2624 | case STOP_CONN_TERM: | |
2625 | iscsi_start_session_recovery(session, conn, flag); | |
8d2860b3 | 2626 | break; |
7996a778 | 2627 | default: |
322d739d MC |
2628 | iscsi_conn_printk(KERN_ERR, conn, |
2629 | "invalid stop flag %d\n", flag); | |
7996a778 MC |
2630 | } |
2631 | } | |
2632 | EXPORT_SYMBOL_GPL(iscsi_conn_stop); | |
2633 | ||
2634 | int iscsi_conn_bind(struct iscsi_cls_session *cls_session, | |
2635 | struct iscsi_cls_conn *cls_conn, int is_leading) | |
2636 | { | |
75613521 | 2637 | struct iscsi_session *session = cls_session->dd_data; |
98644047 | 2638 | struct iscsi_conn *conn = cls_conn->dd_data; |
7996a778 | 2639 | |
7996a778 | 2640 | spin_lock_bh(&session->lock); |
7996a778 MC |
2641 | if (is_leading) |
2642 | session->leadconn = conn; | |
98644047 | 2643 | spin_unlock_bh(&session->lock); |
7996a778 MC |
2644 | |
2645 | /* | |
2646 | * Unblock xmitworker(), Login Phase will pass through. | |
2647 | */ | |
2648 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
2649 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
2650 | return 0; | |
2651 | } | |
2652 | EXPORT_SYMBOL_GPL(iscsi_conn_bind); | |
2653 | ||
a54a52ca MC |
2654 | |
2655 | int iscsi_set_param(struct iscsi_cls_conn *cls_conn, | |
2656 | enum iscsi_param param, char *buf, int buflen) | |
2657 | { | |
2658 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2659 | struct iscsi_session *session = conn->session; | |
2660 | uint32_t value; | |
2661 | ||
2662 | switch(param) { | |
843c0a8a MC |
2663 | case ISCSI_PARAM_FAST_ABORT: |
2664 | sscanf(buf, "%d", &session->fast_abort); | |
2665 | break; | |
f6d5180c MC |
2666 | case ISCSI_PARAM_ABORT_TMO: |
2667 | sscanf(buf, "%d", &session->abort_timeout); | |
2668 | break; | |
2669 | case ISCSI_PARAM_LU_RESET_TMO: | |
2670 | sscanf(buf, "%d", &session->lu_reset_timeout); | |
2671 | break; | |
2672 | case ISCSI_PARAM_PING_TMO: | |
2673 | sscanf(buf, "%d", &conn->ping_timeout); | |
2674 | break; | |
2675 | case ISCSI_PARAM_RECV_TMO: | |
2676 | sscanf(buf, "%d", &conn->recv_timeout); | |
2677 | break; | |
a54a52ca MC |
2678 | case ISCSI_PARAM_MAX_RECV_DLENGTH: |
2679 | sscanf(buf, "%d", &conn->max_recv_dlength); | |
2680 | break; | |
2681 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
2682 | sscanf(buf, "%d", &conn->max_xmit_dlength); | |
2683 | break; | |
2684 | case ISCSI_PARAM_HDRDGST_EN: | |
2685 | sscanf(buf, "%d", &conn->hdrdgst_en); | |
2686 | break; | |
2687 | case ISCSI_PARAM_DATADGST_EN: | |
2688 | sscanf(buf, "%d", &conn->datadgst_en); | |
2689 | break; | |
2690 | case ISCSI_PARAM_INITIAL_R2T_EN: | |
2691 | sscanf(buf, "%d", &session->initial_r2t_en); | |
2692 | break; | |
2693 | case ISCSI_PARAM_MAX_R2T: | |
2694 | sscanf(buf, "%d", &session->max_r2t); | |
2695 | break; | |
2696 | case ISCSI_PARAM_IMM_DATA_EN: | |
2697 | sscanf(buf, "%d", &session->imm_data_en); | |
2698 | break; | |
2699 | case ISCSI_PARAM_FIRST_BURST: | |
2700 | sscanf(buf, "%d", &session->first_burst); | |
2701 | break; | |
2702 | case ISCSI_PARAM_MAX_BURST: | |
2703 | sscanf(buf, "%d", &session->max_burst); | |
2704 | break; | |
2705 | case ISCSI_PARAM_PDU_INORDER_EN: | |
2706 | sscanf(buf, "%d", &session->pdu_inorder_en); | |
2707 | break; | |
2708 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
2709 | sscanf(buf, "%d", &session->dataseq_inorder_en); | |
2710 | break; | |
2711 | case ISCSI_PARAM_ERL: | |
2712 | sscanf(buf, "%d", &session->erl); | |
2713 | break; | |
2714 | case ISCSI_PARAM_IFMARKER_EN: | |
2715 | sscanf(buf, "%d", &value); | |
2716 | BUG_ON(value); | |
2717 | break; | |
2718 | case ISCSI_PARAM_OFMARKER_EN: | |
2719 | sscanf(buf, "%d", &value); | |
2720 | BUG_ON(value); | |
2721 | break; | |
2722 | case ISCSI_PARAM_EXP_STATSN: | |
2723 | sscanf(buf, "%u", &conn->exp_statsn); | |
2724 | break; | |
b2c64167 MC |
2725 | case ISCSI_PARAM_USERNAME: |
2726 | kfree(session->username); | |
2727 | session->username = kstrdup(buf, GFP_KERNEL); | |
2728 | if (!session->username) | |
2729 | return -ENOMEM; | |
2730 | break; | |
2731 | case ISCSI_PARAM_USERNAME_IN: | |
2732 | kfree(session->username_in); | |
2733 | session->username_in = kstrdup(buf, GFP_KERNEL); | |
2734 | if (!session->username_in) | |
2735 | return -ENOMEM; | |
2736 | break; | |
2737 | case ISCSI_PARAM_PASSWORD: | |
2738 | kfree(session->password); | |
2739 | session->password = kstrdup(buf, GFP_KERNEL); | |
2740 | if (!session->password) | |
2741 | return -ENOMEM; | |
2742 | break; | |
2743 | case ISCSI_PARAM_PASSWORD_IN: | |
2744 | kfree(session->password_in); | |
2745 | session->password_in = kstrdup(buf, GFP_KERNEL); | |
2746 | if (!session->password_in) | |
2747 | return -ENOMEM; | |
2748 | break; | |
a54a52ca MC |
2749 | case ISCSI_PARAM_TARGET_NAME: |
2750 | /* this should not change between logins */ | |
2751 | if (session->targetname) | |
2752 | break; | |
2753 | ||
2754 | session->targetname = kstrdup(buf, GFP_KERNEL); | |
2755 | if (!session->targetname) | |
2756 | return -ENOMEM; | |
2757 | break; | |
2758 | case ISCSI_PARAM_TPGT: | |
2759 | sscanf(buf, "%d", &session->tpgt); | |
2760 | break; | |
2761 | case ISCSI_PARAM_PERSISTENT_PORT: | |
2762 | sscanf(buf, "%d", &conn->persistent_port); | |
2763 | break; | |
2764 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
2765 | /* | |
2766 | * this is the address returned in discovery so it should | |
2767 | * not change between logins. | |
2768 | */ | |
2769 | if (conn->persistent_address) | |
2770 | break; | |
2771 | ||
2772 | conn->persistent_address = kstrdup(buf, GFP_KERNEL); | |
2773 | if (!conn->persistent_address) | |
2774 | return -ENOMEM; | |
2775 | break; | |
88dfd340 MC |
2776 | case ISCSI_PARAM_IFACE_NAME: |
2777 | if (!session->ifacename) | |
2778 | session->ifacename = kstrdup(buf, GFP_KERNEL); | |
2779 | break; | |
2780 | case ISCSI_PARAM_INITIATOR_NAME: | |
2781 | if (!session->initiatorname) | |
2782 | session->initiatorname = kstrdup(buf, GFP_KERNEL); | |
2783 | break; | |
a54a52ca MC |
2784 | default: |
2785 | return -ENOSYS; | |
2786 | } | |
2787 | ||
2788 | return 0; | |
2789 | } | |
2790 | EXPORT_SYMBOL_GPL(iscsi_set_param); | |
2791 | ||
2792 | int iscsi_session_get_param(struct iscsi_cls_session *cls_session, | |
2793 | enum iscsi_param param, char *buf) | |
2794 | { | |
75613521 | 2795 | struct iscsi_session *session = cls_session->dd_data; |
a54a52ca MC |
2796 | int len; |
2797 | ||
2798 | switch(param) { | |
843c0a8a MC |
2799 | case ISCSI_PARAM_FAST_ABORT: |
2800 | len = sprintf(buf, "%d\n", session->fast_abort); | |
2801 | break; | |
f6d5180c MC |
2802 | case ISCSI_PARAM_ABORT_TMO: |
2803 | len = sprintf(buf, "%d\n", session->abort_timeout); | |
2804 | break; | |
2805 | case ISCSI_PARAM_LU_RESET_TMO: | |
2806 | len = sprintf(buf, "%d\n", session->lu_reset_timeout); | |
2807 | break; | |
a54a52ca MC |
2808 | case ISCSI_PARAM_INITIAL_R2T_EN: |
2809 | len = sprintf(buf, "%d\n", session->initial_r2t_en); | |
2810 | break; | |
2811 | case ISCSI_PARAM_MAX_R2T: | |
2812 | len = sprintf(buf, "%hu\n", session->max_r2t); | |
2813 | break; | |
2814 | case ISCSI_PARAM_IMM_DATA_EN: | |
2815 | len = sprintf(buf, "%d\n", session->imm_data_en); | |
2816 | break; | |
2817 | case ISCSI_PARAM_FIRST_BURST: | |
2818 | len = sprintf(buf, "%u\n", session->first_burst); | |
2819 | break; | |
2820 | case ISCSI_PARAM_MAX_BURST: | |
2821 | len = sprintf(buf, "%u\n", session->max_burst); | |
2822 | break; | |
2823 | case ISCSI_PARAM_PDU_INORDER_EN: | |
2824 | len = sprintf(buf, "%d\n", session->pdu_inorder_en); | |
2825 | break; | |
2826 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
2827 | len = sprintf(buf, "%d\n", session->dataseq_inorder_en); | |
2828 | break; | |
2829 | case ISCSI_PARAM_ERL: | |
2830 | len = sprintf(buf, "%d\n", session->erl); | |
2831 | break; | |
2832 | case ISCSI_PARAM_TARGET_NAME: | |
2833 | len = sprintf(buf, "%s\n", session->targetname); | |
2834 | break; | |
2835 | case ISCSI_PARAM_TPGT: | |
2836 | len = sprintf(buf, "%d\n", session->tpgt); | |
2837 | break; | |
b2c64167 MC |
2838 | case ISCSI_PARAM_USERNAME: |
2839 | len = sprintf(buf, "%s\n", session->username); | |
2840 | break; | |
2841 | case ISCSI_PARAM_USERNAME_IN: | |
2842 | len = sprintf(buf, "%s\n", session->username_in); | |
2843 | break; | |
2844 | case ISCSI_PARAM_PASSWORD: | |
2845 | len = sprintf(buf, "%s\n", session->password); | |
2846 | break; | |
2847 | case ISCSI_PARAM_PASSWORD_IN: | |
2848 | len = sprintf(buf, "%s\n", session->password_in); | |
2849 | break; | |
88dfd340 MC |
2850 | case ISCSI_PARAM_IFACE_NAME: |
2851 | len = sprintf(buf, "%s\n", session->ifacename); | |
2852 | break; | |
2853 | case ISCSI_PARAM_INITIATOR_NAME: | |
2854 | if (!session->initiatorname) | |
2855 | len = sprintf(buf, "%s\n", "unknown"); | |
2856 | else | |
2857 | len = sprintf(buf, "%s\n", session->initiatorname); | |
2858 | break; | |
a54a52ca MC |
2859 | default: |
2860 | return -ENOSYS; | |
2861 | } | |
2862 | ||
2863 | return len; | |
2864 | } | |
2865 | EXPORT_SYMBOL_GPL(iscsi_session_get_param); | |
2866 | ||
2867 | int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn, | |
2868 | enum iscsi_param param, char *buf) | |
2869 | { | |
2870 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2871 | int len; | |
2872 | ||
2873 | switch(param) { | |
f6d5180c MC |
2874 | case ISCSI_PARAM_PING_TMO: |
2875 | len = sprintf(buf, "%u\n", conn->ping_timeout); | |
2876 | break; | |
2877 | case ISCSI_PARAM_RECV_TMO: | |
2878 | len = sprintf(buf, "%u\n", conn->recv_timeout); | |
2879 | break; | |
a54a52ca MC |
2880 | case ISCSI_PARAM_MAX_RECV_DLENGTH: |
2881 | len = sprintf(buf, "%u\n", conn->max_recv_dlength); | |
2882 | break; | |
2883 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
2884 | len = sprintf(buf, "%u\n", conn->max_xmit_dlength); | |
2885 | break; | |
2886 | case ISCSI_PARAM_HDRDGST_EN: | |
2887 | len = sprintf(buf, "%d\n", conn->hdrdgst_en); | |
2888 | break; | |
2889 | case ISCSI_PARAM_DATADGST_EN: | |
2890 | len = sprintf(buf, "%d\n", conn->datadgst_en); | |
2891 | break; | |
2892 | case ISCSI_PARAM_IFMARKER_EN: | |
2893 | len = sprintf(buf, "%d\n", conn->ifmarker_en); | |
2894 | break; | |
2895 | case ISCSI_PARAM_OFMARKER_EN: | |
2896 | len = sprintf(buf, "%d\n", conn->ofmarker_en); | |
2897 | break; | |
2898 | case ISCSI_PARAM_EXP_STATSN: | |
2899 | len = sprintf(buf, "%u\n", conn->exp_statsn); | |
2900 | break; | |
2901 | case ISCSI_PARAM_PERSISTENT_PORT: | |
2902 | len = sprintf(buf, "%d\n", conn->persistent_port); | |
2903 | break; | |
2904 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
2905 | len = sprintf(buf, "%s\n", conn->persistent_address); | |
2906 | break; | |
2907 | default: | |
2908 | return -ENOSYS; | |
2909 | } | |
2910 | ||
2911 | return len; | |
2912 | } | |
2913 | EXPORT_SYMBOL_GPL(iscsi_conn_get_param); | |
2914 | ||
0801c242 MC |
2915 | int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param, |
2916 | char *buf) | |
2917 | { | |
75613521 | 2918 | struct iscsi_host *ihost = shost_priv(shost); |
0801c242 MC |
2919 | int len; |
2920 | ||
2921 | switch (param) { | |
d8196ed2 | 2922 | case ISCSI_HOST_PARAM_NETDEV_NAME: |
75613521 | 2923 | if (!ihost->netdev) |
d8196ed2 MC |
2924 | len = sprintf(buf, "%s\n", "default"); |
2925 | else | |
75613521 | 2926 | len = sprintf(buf, "%s\n", ihost->netdev); |
d8196ed2 | 2927 | break; |
0801c242 | 2928 | case ISCSI_HOST_PARAM_HWADDRESS: |
75613521 | 2929 | if (!ihost->hwaddress) |
0801c242 MC |
2930 | len = sprintf(buf, "%s\n", "default"); |
2931 | else | |
75613521 | 2932 | len = sprintf(buf, "%s\n", ihost->hwaddress); |
0801c242 | 2933 | break; |
8ad5781a | 2934 | case ISCSI_HOST_PARAM_INITIATOR_NAME: |
75613521 | 2935 | if (!ihost->initiatorname) |
8ad5781a MC |
2936 | len = sprintf(buf, "%s\n", "unknown"); |
2937 | else | |
75613521 | 2938 | len = sprintf(buf, "%s\n", ihost->initiatorname); |
8ad5781a | 2939 | break; |
75613521 MC |
2940 | case ISCSI_HOST_PARAM_IPADDRESS: |
2941 | if (!strlen(ihost->local_address)) | |
2942 | len = sprintf(buf, "%s\n", "unknown"); | |
2943 | else | |
2944 | len = sprintf(buf, "%s\n", | |
2945 | ihost->local_address); | |
88dfd340 | 2946 | break; |
0801c242 MC |
2947 | default: |
2948 | return -ENOSYS; | |
2949 | } | |
2950 | ||
2951 | return len; | |
2952 | } | |
2953 | EXPORT_SYMBOL_GPL(iscsi_host_get_param); | |
2954 | ||
2955 | int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param, | |
2956 | char *buf, int buflen) | |
2957 | { | |
75613521 | 2958 | struct iscsi_host *ihost = shost_priv(shost); |
0801c242 MC |
2959 | |
2960 | switch (param) { | |
d8196ed2 | 2961 | case ISCSI_HOST_PARAM_NETDEV_NAME: |
75613521 MC |
2962 | if (!ihost->netdev) |
2963 | ihost->netdev = kstrdup(buf, GFP_KERNEL); | |
d8196ed2 | 2964 | break; |
0801c242 | 2965 | case ISCSI_HOST_PARAM_HWADDRESS: |
75613521 MC |
2966 | if (!ihost->hwaddress) |
2967 | ihost->hwaddress = kstrdup(buf, GFP_KERNEL); | |
0801c242 | 2968 | break; |
8ad5781a | 2969 | case ISCSI_HOST_PARAM_INITIATOR_NAME: |
75613521 MC |
2970 | if (!ihost->initiatorname) |
2971 | ihost->initiatorname = kstrdup(buf, GFP_KERNEL); | |
8ad5781a | 2972 | break; |
0801c242 MC |
2973 | default: |
2974 | return -ENOSYS; | |
2975 | } | |
2976 | ||
2977 | return 0; | |
2978 | } | |
2979 | EXPORT_SYMBOL_GPL(iscsi_host_set_param); | |
2980 | ||
7996a778 MC |
2981 | MODULE_AUTHOR("Mike Christie"); |
2982 | MODULE_DESCRIPTION("iSCSI library functions"); | |
2983 | MODULE_LICENSE("GPL"); |