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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 | ||
bd2199d4 EZ |
41 | static int iscsi_dbg_lib_conn; |
42 | module_param_named(debug_libiscsi_conn, iscsi_dbg_lib_conn, int, | |
43 | S_IRUGO | S_IWUSR); | |
44 | MODULE_PARM_DESC(debug_libiscsi_conn, | |
45 | "Turn on debugging for connections in libiscsi module. " | |
46 | "Set to 1 to turn on, and zero to turn off. Default is off."); | |
47 | ||
48 | static int iscsi_dbg_lib_session; | |
49 | module_param_named(debug_libiscsi_session, iscsi_dbg_lib_session, int, | |
50 | S_IRUGO | S_IWUSR); | |
51 | MODULE_PARM_DESC(debug_libiscsi_session, | |
52 | "Turn on debugging for sessions in libiscsi module. " | |
53 | "Set to 1 to turn on, and zero to turn off. Default is off."); | |
54 | ||
55 | static int iscsi_dbg_lib_eh; | |
56 | module_param_named(debug_libiscsi_eh, iscsi_dbg_lib_eh, int, | |
57 | S_IRUGO | S_IWUSR); | |
58 | MODULE_PARM_DESC(debug_libiscsi_eh, | |
59 | "Turn on debugging for error handling in libiscsi module. " | |
60 | "Set to 1 to turn on, and zero to turn off. Default is off."); | |
1b2c7af8 MC |
61 | |
62 | #define ISCSI_DBG_CONN(_conn, dbg_fmt, arg...) \ | |
63 | do { \ | |
bd2199d4 | 64 | if (iscsi_dbg_lib_conn) \ |
1b2c7af8 MC |
65 | iscsi_conn_printk(KERN_INFO, _conn, \ |
66 | "%s " dbg_fmt, \ | |
67 | __func__, ##arg); \ | |
68 | } while (0); | |
69 | ||
70 | #define ISCSI_DBG_SESSION(_session, dbg_fmt, arg...) \ | |
71 | do { \ | |
bd2199d4 EZ |
72 | if (iscsi_dbg_lib_session) \ |
73 | iscsi_session_printk(KERN_INFO, _session, \ | |
74 | "%s " dbg_fmt, \ | |
75 | __func__, ##arg); \ | |
76 | } while (0); | |
77 | ||
78 | #define ISCSI_DBG_EH(_session, dbg_fmt, arg...) \ | |
79 | do { \ | |
80 | if (iscsi_dbg_lib_eh) \ | |
1b2c7af8 MC |
81 | iscsi_session_printk(KERN_INFO, _session, \ |
82 | "%s " dbg_fmt, \ | |
83 | __func__, ##arg); \ | |
84 | } while (0); | |
85 | ||
77a23c21 MC |
86 | /* Serial Number Arithmetic, 32 bits, less than, RFC1982 */ |
87 | #define SNA32_CHECK 2147483648UL | |
7996a778 | 88 | |
77a23c21 MC |
89 | static int iscsi_sna_lt(u32 n1, u32 n2) |
90 | { | |
91 | return n1 != n2 && ((n1 < n2 && (n2 - n1 < SNA32_CHECK)) || | |
92 | (n1 > n2 && (n2 - n1 < SNA32_CHECK))); | |
93 | } | |
94 | ||
95 | /* Serial Number Arithmetic, 32 bits, less than, RFC1982 */ | |
96 | static int iscsi_sna_lte(u32 n1, u32 n2) | |
97 | { | |
98 | return n1 == n2 || ((n1 < n2 && (n2 - n1 < SNA32_CHECK)) || | |
99 | (n1 > n2 && (n2 - n1 < SNA32_CHECK))); | |
100 | } | |
101 | ||
32ae763e MC |
102 | inline void iscsi_conn_queue_work(struct iscsi_conn *conn) |
103 | { | |
104 | struct Scsi_Host *shost = conn->session->host; | |
105 | struct iscsi_host *ihost = shost_priv(shost); | |
106 | ||
1336aed1 MC |
107 | if (ihost->workq) |
108 | queue_work(ihost->workq, &conn->xmitwork); | |
32ae763e MC |
109 | } |
110 | EXPORT_SYMBOL_GPL(iscsi_conn_queue_work); | |
111 | ||
4c0ba5d2 MC |
112 | static void __iscsi_update_cmdsn(struct iscsi_session *session, |
113 | uint32_t exp_cmdsn, uint32_t max_cmdsn) | |
7996a778 | 114 | { |
77a23c21 MC |
115 | /* |
116 | * standard specifies this check for when to update expected and | |
117 | * max sequence numbers | |
118 | */ | |
119 | if (iscsi_sna_lt(max_cmdsn, exp_cmdsn - 1)) | |
120 | return; | |
121 | ||
122 | if (exp_cmdsn != session->exp_cmdsn && | |
123 | !iscsi_sna_lt(exp_cmdsn, session->exp_cmdsn)) | |
7996a778 MC |
124 | session->exp_cmdsn = exp_cmdsn; |
125 | ||
77a23c21 MC |
126 | if (max_cmdsn != session->max_cmdsn && |
127 | !iscsi_sna_lt(max_cmdsn, session->max_cmdsn)) { | |
128 | session->max_cmdsn = max_cmdsn; | |
129 | /* | |
130 | * if the window closed with IO queued, then kick the | |
131 | * xmit thread | |
132 | */ | |
3bbaaad9 | 133 | if (!list_empty(&session->leadconn->cmdqueue) || |
1336aed1 MC |
134 | !list_empty(&session->leadconn->mgmtqueue)) |
135 | iscsi_conn_queue_work(session->leadconn); | |
77a23c21 | 136 | } |
7996a778 | 137 | } |
4c0ba5d2 MC |
138 | |
139 | void iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr) | |
140 | { | |
141 | __iscsi_update_cmdsn(session, be32_to_cpu(hdr->exp_cmdsn), | |
142 | be32_to_cpu(hdr->max_cmdsn)); | |
143 | } | |
77a23c21 | 144 | EXPORT_SYMBOL_GPL(iscsi_update_cmdsn); |
7996a778 | 145 | |
577577da MC |
146 | /** |
147 | * iscsi_prep_data_out_pdu - initialize Data-Out | |
148 | * @task: scsi command task | |
149 | * @r2t: R2T info | |
150 | * @hdr: iscsi data in pdu | |
151 | * | |
152 | * Notes: | |
153 | * Initialize Data-Out within this R2T sequence and finds | |
154 | * proper data_offset within this SCSI command. | |
155 | * | |
156 | * This function is called with connection lock taken. | |
157 | **/ | |
158 | void iscsi_prep_data_out_pdu(struct iscsi_task *task, struct iscsi_r2t_info *r2t, | |
159 | struct iscsi_data *hdr) | |
7996a778 | 160 | { |
9c19a7d0 | 161 | struct iscsi_conn *conn = task->conn; |
577577da MC |
162 | unsigned int left = r2t->data_length - r2t->sent; |
163 | ||
164 | task->hdr_len = sizeof(struct iscsi_data); | |
7996a778 MC |
165 | |
166 | memset(hdr, 0, sizeof(struct iscsi_data)); | |
577577da MC |
167 | hdr->ttt = r2t->ttt; |
168 | hdr->datasn = cpu_to_be32(r2t->datasn); | |
169 | r2t->datasn++; | |
7996a778 | 170 | hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; |
577577da MC |
171 | memcpy(hdr->lun, task->lun, sizeof(hdr->lun)); |
172 | hdr->itt = task->hdr_itt; | |
173 | hdr->exp_statsn = r2t->exp_statsn; | |
174 | hdr->offset = cpu_to_be32(r2t->data_offset + r2t->sent); | |
175 | if (left > conn->max_xmit_dlength) { | |
7996a778 | 176 | hton24(hdr->dlength, conn->max_xmit_dlength); |
577577da | 177 | r2t->data_count = conn->max_xmit_dlength; |
7996a778 MC |
178 | hdr->flags = 0; |
179 | } else { | |
577577da MC |
180 | hton24(hdr->dlength, left); |
181 | r2t->data_count = left; | |
7996a778 MC |
182 | hdr->flags = ISCSI_FLAG_CMD_FINAL; |
183 | } | |
577577da | 184 | conn->dataout_pdus_cnt++; |
7996a778 | 185 | } |
577577da | 186 | EXPORT_SYMBOL_GPL(iscsi_prep_data_out_pdu); |
7996a778 | 187 | |
9c19a7d0 | 188 | static int iscsi_add_hdr(struct iscsi_task *task, unsigned len) |
004d6530 | 189 | { |
9c19a7d0 | 190 | unsigned exp_len = task->hdr_len + len; |
004d6530 | 191 | |
9c19a7d0 | 192 | if (exp_len > task->hdr_max) { |
004d6530 BH |
193 | WARN_ON(1); |
194 | return -EINVAL; | |
195 | } | |
196 | ||
197 | WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */ | |
9c19a7d0 | 198 | task->hdr_len = exp_len; |
004d6530 BH |
199 | return 0; |
200 | } | |
201 | ||
38d1c069 BH |
202 | /* |
203 | * make an extended cdb AHS | |
204 | */ | |
9c19a7d0 | 205 | static int iscsi_prep_ecdb_ahs(struct iscsi_task *task) |
38d1c069 | 206 | { |
9c19a7d0 | 207 | struct scsi_cmnd *cmd = task->sc; |
38d1c069 BH |
208 | unsigned rlen, pad_len; |
209 | unsigned short ahslength; | |
210 | struct iscsi_ecdb_ahdr *ecdb_ahdr; | |
211 | int rc; | |
212 | ||
9c19a7d0 | 213 | ecdb_ahdr = iscsi_next_hdr(task); |
38d1c069 BH |
214 | rlen = cmd->cmd_len - ISCSI_CDB_SIZE; |
215 | ||
216 | BUG_ON(rlen > sizeof(ecdb_ahdr->ecdb)); | |
217 | ahslength = rlen + sizeof(ecdb_ahdr->reserved); | |
218 | ||
219 | pad_len = iscsi_padding(rlen); | |
220 | ||
9c19a7d0 | 221 | rc = iscsi_add_hdr(task, sizeof(ecdb_ahdr->ahslength) + |
38d1c069 BH |
222 | sizeof(ecdb_ahdr->ahstype) + ahslength + pad_len); |
223 | if (rc) | |
224 | return rc; | |
225 | ||
226 | if (pad_len) | |
227 | memset(&ecdb_ahdr->ecdb[rlen], 0, pad_len); | |
228 | ||
229 | ecdb_ahdr->ahslength = cpu_to_be16(ahslength); | |
230 | ecdb_ahdr->ahstype = ISCSI_AHSTYPE_CDB; | |
231 | ecdb_ahdr->reserved = 0; | |
232 | memcpy(ecdb_ahdr->ecdb, cmd->cmnd + ISCSI_CDB_SIZE, rlen); | |
233 | ||
1b2c7af8 MC |
234 | ISCSI_DBG_SESSION(task->conn->session, |
235 | "iscsi_prep_ecdb_ahs: varlen_cdb_len %d " | |
236 | "rlen %d pad_len %d ahs_length %d iscsi_headers_size " | |
237 | "%u\n", cmd->cmd_len, rlen, pad_len, ahslength, | |
238 | task->hdr_len); | |
38d1c069 BH |
239 | return 0; |
240 | } | |
241 | ||
9c19a7d0 | 242 | static int iscsi_prep_bidi_ahs(struct iscsi_task *task) |
c07d4444 | 243 | { |
9c19a7d0 | 244 | struct scsi_cmnd *sc = task->sc; |
c07d4444 BH |
245 | struct iscsi_rlength_ahdr *rlen_ahdr; |
246 | int rc; | |
247 | ||
9c19a7d0 MC |
248 | rlen_ahdr = iscsi_next_hdr(task); |
249 | rc = iscsi_add_hdr(task, sizeof(*rlen_ahdr)); | |
c07d4444 BH |
250 | if (rc) |
251 | return rc; | |
252 | ||
253 | rlen_ahdr->ahslength = | |
254 | cpu_to_be16(sizeof(rlen_ahdr->read_length) + | |
255 | sizeof(rlen_ahdr->reserved)); | |
256 | rlen_ahdr->ahstype = ISCSI_AHSTYPE_RLENGTH; | |
257 | rlen_ahdr->reserved = 0; | |
258 | rlen_ahdr->read_length = cpu_to_be32(scsi_in(sc)->length); | |
259 | ||
1b2c7af8 MC |
260 | ISCSI_DBG_SESSION(task->conn->session, |
261 | "bidi-in rlen_ahdr->read_length(%d) " | |
262 | "rlen_ahdr->ahslength(%d)\n", | |
263 | be32_to_cpu(rlen_ahdr->read_length), | |
264 | be16_to_cpu(rlen_ahdr->ahslength)); | |
c07d4444 BH |
265 | return 0; |
266 | } | |
267 | ||
7996a778 MC |
268 | /** |
269 | * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu | |
9c19a7d0 | 270 | * @task: iscsi task |
7996a778 MC |
271 | * |
272 | * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set | |
273 | * fields like dlength or final based on how much data it sends | |
274 | */ | |
9c19a7d0 | 275 | static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task) |
7996a778 | 276 | { |
9c19a7d0 | 277 | struct iscsi_conn *conn = task->conn; |
7996a778 | 278 | struct iscsi_session *session = conn->session; |
9c19a7d0 | 279 | struct scsi_cmnd *sc = task->sc; |
577577da | 280 | struct iscsi_cmd *hdr; |
38d1c069 | 281 | unsigned hdrlength, cmd_len; |
262ef636 | 282 | itt_t itt; |
004d6530 | 283 | int rc; |
7996a778 | 284 | |
184b57c6 MC |
285 | if (conn->session->tt->alloc_pdu) { |
286 | rc = conn->session->tt->alloc_pdu(task, ISCSI_OP_SCSI_CMD); | |
287 | if (rc) | |
288 | return rc; | |
289 | } | |
577577da | 290 | hdr = (struct iscsi_cmd *) task->hdr; |
262ef636 | 291 | itt = hdr->itt; |
577577da MC |
292 | memset(hdr, 0, sizeof(*hdr)); |
293 | ||
2ff79d52 MC |
294 | if (session->tt->parse_pdu_itt) |
295 | hdr->itt = task->hdr_itt = itt; | |
296 | else | |
297 | hdr->itt = task->hdr_itt = build_itt(task->itt, | |
298 | task->conn->session->age); | |
9c19a7d0 MC |
299 | task->hdr_len = 0; |
300 | rc = iscsi_add_hdr(task, sizeof(*hdr)); | |
004d6530 BH |
301 | if (rc) |
302 | return rc; | |
a8ac6311 OK |
303 | hdr->opcode = ISCSI_OP_SCSI_CMD; |
304 | hdr->flags = ISCSI_ATTR_SIMPLE; | |
305 | int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun); | |
577577da | 306 | memcpy(task->lun, hdr->lun, sizeof(task->lun)); |
a8ac6311 | 307 | hdr->exp_statsn = cpu_to_be32(conn->exp_statsn); |
38d1c069 BH |
308 | cmd_len = sc->cmd_len; |
309 | if (cmd_len < ISCSI_CDB_SIZE) | |
310 | memset(&hdr->cdb[cmd_len], 0, ISCSI_CDB_SIZE - cmd_len); | |
311 | else if (cmd_len > ISCSI_CDB_SIZE) { | |
9c19a7d0 | 312 | rc = iscsi_prep_ecdb_ahs(task); |
38d1c069 BH |
313 | if (rc) |
314 | return rc; | |
315 | cmd_len = ISCSI_CDB_SIZE; | |
316 | } | |
317 | memcpy(hdr->cdb, sc->cmnd, cmd_len); | |
7996a778 | 318 | |
9c19a7d0 | 319 | task->imm_count = 0; |
c07d4444 BH |
320 | if (scsi_bidi_cmnd(sc)) { |
321 | hdr->flags |= ISCSI_FLAG_CMD_READ; | |
9c19a7d0 | 322 | rc = iscsi_prep_bidi_ahs(task); |
c07d4444 BH |
323 | if (rc) |
324 | return rc; | |
325 | } | |
7996a778 | 326 | if (sc->sc_data_direction == DMA_TO_DEVICE) { |
c07d4444 | 327 | unsigned out_len = scsi_out(sc)->length; |
577577da MC |
328 | struct iscsi_r2t_info *r2t = &task->unsol_r2t; |
329 | ||
c07d4444 | 330 | hdr->data_length = cpu_to_be32(out_len); |
7996a778 MC |
331 | hdr->flags |= ISCSI_FLAG_CMD_WRITE; |
332 | /* | |
333 | * Write counters: | |
334 | * | |
335 | * imm_count bytes to be sent right after | |
336 | * SCSI PDU Header | |
337 | * | |
338 | * unsol_count bytes(as Data-Out) to be sent | |
339 | * without R2T ack right after | |
340 | * immediate data | |
341 | * | |
577577da | 342 | * r2t data_length bytes to be sent via R2T ack's |
7996a778 MC |
343 | * |
344 | * pad_count bytes to be sent as zero-padding | |
345 | */ | |
577577da | 346 | memset(r2t, 0, sizeof(*r2t)); |
7996a778 MC |
347 | |
348 | if (session->imm_data_en) { | |
c07d4444 | 349 | if (out_len >= session->first_burst) |
9c19a7d0 | 350 | task->imm_count = min(session->first_burst, |
7996a778 MC |
351 | conn->max_xmit_dlength); |
352 | else | |
9c19a7d0 | 353 | task->imm_count = min(out_len, |
7996a778 | 354 | conn->max_xmit_dlength); |
9c19a7d0 | 355 | hton24(hdr->dlength, task->imm_count); |
7996a778 | 356 | } else |
a8ac6311 | 357 | zero_data(hdr->dlength); |
7996a778 | 358 | |
ffd0436e | 359 | if (!session->initial_r2t_en) { |
577577da MC |
360 | r2t->data_length = min(session->first_burst, out_len) - |
361 | task->imm_count; | |
362 | r2t->data_offset = task->imm_count; | |
363 | r2t->ttt = cpu_to_be32(ISCSI_RESERVED_TAG); | |
364 | r2t->exp_statsn = cpu_to_be32(conn->exp_statsn); | |
ffd0436e MC |
365 | } |
366 | ||
577577da | 367 | if (!task->unsol_r2t.data_length) |
7996a778 | 368 | /* No unsolicit Data-Out's */ |
a8ac6311 | 369 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; |
7996a778 | 370 | } else { |
7996a778 MC |
371 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; |
372 | zero_data(hdr->dlength); | |
c07d4444 | 373 | hdr->data_length = cpu_to_be32(scsi_in(sc)->length); |
7996a778 MC |
374 | |
375 | if (sc->sc_data_direction == DMA_FROM_DEVICE) | |
376 | hdr->flags |= ISCSI_FLAG_CMD_READ; | |
377 | } | |
378 | ||
004d6530 | 379 | /* calculate size of additional header segments (AHSs) */ |
9c19a7d0 | 380 | hdrlength = task->hdr_len - sizeof(*hdr); |
004d6530 BH |
381 | |
382 | WARN_ON(hdrlength & (ISCSI_PAD_LEN-1)); | |
383 | hdrlength /= ISCSI_PAD_LEN; | |
384 | ||
385 | WARN_ON(hdrlength >= 256); | |
386 | hdr->hlength = hdrlength & 0xFF; | |
387 | ||
577577da | 388 | if (session->tt->init_task && session->tt->init_task(task)) |
052d0144 MC |
389 | return -EIO; |
390 | ||
9c19a7d0 | 391 | task->state = ISCSI_TASK_RUNNING; |
d3305f34 MC |
392 | hdr->cmdsn = task->cmdsn = cpu_to_be32(session->cmdsn); |
393 | session->cmdsn++; | |
77a23c21 | 394 | |
a8ac6311 | 395 | conn->scsicmd_pdus_cnt++; |
1b2c7af8 MC |
396 | ISCSI_DBG_SESSION(session, "iscsi prep [%s cid %d sc %p cdb 0x%x " |
397 | "itt 0x%x len %d bidi_len %d cmdsn %d win %d]\n", | |
398 | scsi_bidi_cmnd(sc) ? "bidirectional" : | |
399 | sc->sc_data_direction == DMA_TO_DEVICE ? | |
400 | "write" : "read", conn->id, sc, sc->cmnd[0], | |
401 | task->itt, scsi_bufflen(sc), | |
402 | scsi_bidi_cmnd(sc) ? scsi_in(sc)->length : 0, | |
403 | session->cmdsn, | |
404 | session->max_cmdsn - session->exp_cmdsn + 1); | |
004d6530 | 405 | return 0; |
7996a778 | 406 | } |
7996a778 MC |
407 | |
408 | /** | |
3bbaaad9 | 409 | * iscsi_free_task - free a task |
9c19a7d0 | 410 | * @task: iscsi cmd task |
7996a778 MC |
411 | * |
412 | * Must be called with session lock. | |
3e5c28ad MC |
413 | * This function returns the scsi command to scsi-ml or cleans |
414 | * up mgmt tasks then returns the task to the pool. | |
7996a778 | 415 | */ |
3bbaaad9 | 416 | static void iscsi_free_task(struct iscsi_task *task) |
7996a778 | 417 | { |
9c19a7d0 | 418 | struct iscsi_conn *conn = task->conn; |
c1635cb7 | 419 | struct iscsi_session *session = conn->session; |
9c19a7d0 | 420 | struct scsi_cmnd *sc = task->sc; |
7996a778 | 421 | |
4421c9eb MC |
422 | ISCSI_DBG_SESSION(session, "freeing task itt 0x%x state %d sc %p\n", |
423 | task->itt, task->state, task->sc); | |
424 | ||
577577da | 425 | session->tt->cleanup_task(task); |
3bbaaad9 | 426 | task->state = ISCSI_TASK_FREE; |
9c19a7d0 | 427 | task->sc = NULL; |
3e5c28ad | 428 | /* |
9c19a7d0 | 429 | * login task is preallocated so do not free |
3e5c28ad | 430 | */ |
9c19a7d0 | 431 | if (conn->login_task == task) |
3e5c28ad MC |
432 | return; |
433 | ||
9c19a7d0 | 434 | __kfifo_put(session->cmdpool.queue, (void*)&task, sizeof(void*)); |
052d0144 | 435 | |
3e5c28ad | 436 | if (sc) { |
9c19a7d0 | 437 | task->sc = NULL; |
3e5c28ad MC |
438 | /* SCSI eh reuses commands to verify us */ |
439 | sc->SCp.ptr = NULL; | |
440 | /* | |
441 | * queue command may call this to free the task, but | |
442 | * not have setup the sc callback | |
443 | */ | |
444 | if (sc->scsi_done) | |
445 | sc->scsi_done(sc); | |
446 | } | |
7996a778 MC |
447 | } |
448 | ||
913e5bf4 | 449 | void __iscsi_get_task(struct iscsi_task *task) |
60ecebf5 | 450 | { |
9c19a7d0 | 451 | atomic_inc(&task->refcount); |
60ecebf5 | 452 | } |
913e5bf4 | 453 | EXPORT_SYMBOL_GPL(__iscsi_get_task); |
60ecebf5 | 454 | |
9c19a7d0 | 455 | static void __iscsi_put_task(struct iscsi_task *task) |
60ecebf5 | 456 | { |
9c19a7d0 | 457 | if (atomic_dec_and_test(&task->refcount)) |
3bbaaad9 | 458 | iscsi_free_task(task); |
60ecebf5 MC |
459 | } |
460 | ||
9c19a7d0 | 461 | void iscsi_put_task(struct iscsi_task *task) |
3e5c28ad | 462 | { |
9c19a7d0 | 463 | struct iscsi_session *session = task->conn->session; |
3e5c28ad MC |
464 | |
465 | spin_lock_bh(&session->lock); | |
9c19a7d0 | 466 | __iscsi_put_task(task); |
3e5c28ad MC |
467 | spin_unlock_bh(&session->lock); |
468 | } | |
9c19a7d0 | 469 | EXPORT_SYMBOL_GPL(iscsi_put_task); |
3e5c28ad | 470 | |
3bbaaad9 MC |
471 | /** |
472 | * iscsi_complete_task - finish a task | |
473 | * @task: iscsi cmd task | |
b3cd5050 | 474 | * @state: state to complete task with |
3bbaaad9 MC |
475 | * |
476 | * Must be called with session lock. | |
477 | */ | |
b3cd5050 | 478 | static void iscsi_complete_task(struct iscsi_task *task, int state) |
3bbaaad9 MC |
479 | { |
480 | struct iscsi_conn *conn = task->conn; | |
481 | ||
4421c9eb MC |
482 | ISCSI_DBG_SESSION(conn->session, |
483 | "complete task itt 0x%x state %d sc %p\n", | |
484 | task->itt, task->state, task->sc); | |
b3cd5050 MC |
485 | if (task->state == ISCSI_TASK_COMPLETED || |
486 | task->state == ISCSI_TASK_ABRT_TMF || | |
487 | task->state == ISCSI_TASK_ABRT_SESS_RECOV) | |
3bbaaad9 MC |
488 | return; |
489 | WARN_ON_ONCE(task->state == ISCSI_TASK_FREE); | |
b3cd5050 | 490 | task->state = state; |
3bbaaad9 MC |
491 | |
492 | if (!list_empty(&task->running)) | |
493 | list_del_init(&task->running); | |
494 | ||
495 | if (conn->task == task) | |
496 | conn->task = NULL; | |
497 | ||
498 | if (conn->ping_task == task) | |
499 | conn->ping_task = NULL; | |
500 | ||
501 | /* release get from queueing */ | |
502 | __iscsi_put_task(task); | |
503 | } | |
504 | ||
4c0ba5d2 MC |
505 | /** |
506 | * iscsi_complete_scsi_task - finish scsi task normally | |
507 | * @task: iscsi task for scsi cmd | |
508 | * @exp_cmdsn: expected cmd sn in cpu format | |
509 | * @max_cmdsn: max cmd sn in cpu format | |
510 | * | |
511 | * This is used when drivers do not need or cannot perform | |
512 | * lower level pdu processing. | |
513 | * | |
514 | * Called with session lock | |
515 | */ | |
516 | void iscsi_complete_scsi_task(struct iscsi_task *task, | |
517 | uint32_t exp_cmdsn, uint32_t max_cmdsn) | |
518 | { | |
519 | struct iscsi_conn *conn = task->conn; | |
520 | ||
521 | ISCSI_DBG_SESSION(conn->session, "[itt 0x%x]\n", task->itt); | |
522 | ||
523 | conn->last_recv = jiffies; | |
524 | __iscsi_update_cmdsn(conn->session, exp_cmdsn, max_cmdsn); | |
525 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); | |
526 | } | |
527 | EXPORT_SYMBOL_GPL(iscsi_complete_scsi_task); | |
528 | ||
529 | ||
b3a7ea8d | 530 | /* |
3bbaaad9 MC |
531 | * session lock must be held and if not called for a task that is |
532 | * still pending or from the xmit thread, then xmit thread must | |
533 | * be suspended. | |
b3a7ea8d | 534 | */ |
3bbaaad9 | 535 | static void fail_scsi_task(struct iscsi_task *task, int err) |
b3a7ea8d | 536 | { |
3bbaaad9 | 537 | struct iscsi_conn *conn = task->conn; |
b3a7ea8d | 538 | struct scsi_cmnd *sc; |
b3cd5050 | 539 | int state; |
b3a7ea8d | 540 | |
3bbaaad9 MC |
541 | /* |
542 | * if a command completes and we get a successful tmf response | |
543 | * we will hit this because the scsi eh abort code does not take | |
544 | * a ref to the task. | |
545 | */ | |
9c19a7d0 | 546 | sc = task->sc; |
b3a7ea8d MC |
547 | if (!sc) |
548 | return; | |
549 | ||
b3cd5050 | 550 | if (task->state == ISCSI_TASK_PENDING) { |
b3a7ea8d MC |
551 | /* |
552 | * cmd never made it to the xmit thread, so we should not count | |
553 | * the cmd in the sequencing | |
554 | */ | |
555 | conn->session->queued_cmdsn--; | |
b3cd5050 MC |
556 | /* it was never sent so just complete like normal */ |
557 | state = ISCSI_TASK_COMPLETED; | |
558 | } else if (err == DID_TRANSPORT_DISRUPTED) | |
559 | state = ISCSI_TASK_ABRT_SESS_RECOV; | |
560 | else | |
561 | state = ISCSI_TASK_ABRT_TMF; | |
b3a7ea8d | 562 | |
b3cd5050 | 563 | sc->result = err << 16; |
c07d4444 BH |
564 | if (!scsi_bidi_cmnd(sc)) |
565 | scsi_set_resid(sc, scsi_bufflen(sc)); | |
566 | else { | |
567 | scsi_out(sc)->resid = scsi_out(sc)->length; | |
568 | scsi_in(sc)->resid = scsi_in(sc)->length; | |
569 | } | |
3e5c28ad | 570 | |
b3cd5050 | 571 | iscsi_complete_task(task, state); |
b3a7ea8d MC |
572 | } |
573 | ||
3e5c28ad | 574 | static int iscsi_prep_mgmt_task(struct iscsi_conn *conn, |
9c19a7d0 | 575 | struct iscsi_task *task) |
052d0144 MC |
576 | { |
577 | struct iscsi_session *session = conn->session; | |
577577da | 578 | struct iscsi_hdr *hdr = task->hdr; |
052d0144 MC |
579 | struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr; |
580 | ||
581 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) | |
582 | return -ENOTCONN; | |
583 | ||
584 | if (hdr->opcode != (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) && | |
585 | hdr->opcode != (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE)) | |
586 | nop->exp_statsn = cpu_to_be32(conn->exp_statsn); | |
587 | /* | |
588 | * pre-format CmdSN for outgoing PDU. | |
589 | */ | |
590 | nop->cmdsn = cpu_to_be32(session->cmdsn); | |
591 | if (hdr->itt != RESERVED_ITT) { | |
052d0144 MC |
592 | /* |
593 | * TODO: We always use immediate, so we never hit this. | |
594 | * If we start to send tmfs or nops as non-immediate then | |
595 | * we should start checking the cmdsn numbers for mgmt tasks. | |
596 | */ | |
597 | if (conn->c_stage == ISCSI_CONN_STARTED && | |
598 | !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { | |
599 | session->queued_cmdsn++; | |
600 | session->cmdsn++; | |
601 | } | |
602 | } | |
603 | ||
ae15f801 MC |
604 | if (session->tt->init_task && session->tt->init_task(task)) |
605 | return -EIO; | |
052d0144 MC |
606 | |
607 | if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT) | |
608 | session->state = ISCSI_STATE_LOGGING_OUT; | |
609 | ||
577577da | 610 | task->state = ISCSI_TASK_RUNNING; |
1b2c7af8 MC |
611 | ISCSI_DBG_SESSION(session, "mgmtpdu [op 0x%x hdr->itt 0x%x " |
612 | "datalen %d]\n", hdr->opcode & ISCSI_OPCODE_MASK, | |
613 | hdr->itt, task->data_count); | |
052d0144 MC |
614 | return 0; |
615 | } | |
616 | ||
9c19a7d0 | 617 | static struct iscsi_task * |
f6d5180c MC |
618 | __iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
619 | char *data, uint32_t data_size) | |
620 | { | |
621 | struct iscsi_session *session = conn->session; | |
1336aed1 | 622 | struct iscsi_host *ihost = shost_priv(session->host); |
9c19a7d0 | 623 | struct iscsi_task *task; |
262ef636 | 624 | itt_t itt; |
f6d5180c MC |
625 | |
626 | if (session->state == ISCSI_STATE_TERMINATE) | |
627 | return NULL; | |
628 | ||
629 | if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) || | |
630 | hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE)) | |
631 | /* | |
632 | * Login and Text are sent serially, in | |
633 | * request-followed-by-response sequence. | |
3e5c28ad MC |
634 | * Same task can be used. Same ITT must be used. |
635 | * Note that login_task is preallocated at conn_create(). | |
f6d5180c | 636 | */ |
9c19a7d0 | 637 | task = conn->login_task; |
f6d5180c | 638 | else { |
26013ad4 MC |
639 | if (session->state != ISCSI_STATE_LOGGED_IN) |
640 | return NULL; | |
641 | ||
f6d5180c MC |
642 | BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE); |
643 | BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED); | |
644 | ||
3e5c28ad | 645 | if (!__kfifo_get(session->cmdpool.queue, |
9c19a7d0 | 646 | (void*)&task, sizeof(void*))) |
f6d5180c MC |
647 | return NULL; |
648 | } | |
3e5c28ad MC |
649 | /* |
650 | * released in complete pdu for task we expect a response for, and | |
651 | * released by the lld when it has transmitted the task for | |
652 | * pdus we do not expect a response for. | |
653 | */ | |
9c19a7d0 MC |
654 | atomic_set(&task->refcount, 1); |
655 | task->conn = conn; | |
656 | task->sc = NULL; | |
3bbaaad9 MC |
657 | INIT_LIST_HEAD(&task->running); |
658 | task->state = ISCSI_TASK_PENDING; | |
f6d5180c MC |
659 | |
660 | if (data_size) { | |
9c19a7d0 MC |
661 | memcpy(task->data, data, data_size); |
662 | task->data_count = data_size; | |
f6d5180c | 663 | } else |
9c19a7d0 | 664 | task->data_count = 0; |
f6d5180c | 665 | |
184b57c6 MC |
666 | if (conn->session->tt->alloc_pdu) { |
667 | if (conn->session->tt->alloc_pdu(task, hdr->opcode)) { | |
668 | iscsi_conn_printk(KERN_ERR, conn, "Could not allocate " | |
669 | "pdu for mgmt task.\n"); | |
3bbaaad9 | 670 | goto free_task; |
184b57c6 | 671 | } |
577577da | 672 | } |
184b57c6 | 673 | |
262ef636 | 674 | itt = task->hdr->itt; |
577577da | 675 | task->hdr_len = sizeof(struct iscsi_hdr); |
9c19a7d0 | 676 | memcpy(task->hdr, hdr, sizeof(struct iscsi_hdr)); |
262ef636 MC |
677 | |
678 | if (hdr->itt != RESERVED_ITT) { | |
679 | if (session->tt->parse_pdu_itt) | |
680 | task->hdr->itt = itt; | |
681 | else | |
682 | task->hdr->itt = build_itt(task->itt, | |
683 | task->conn->session->age); | |
684 | } | |
685 | ||
1336aed1 | 686 | if (!ihost->workq) { |
577577da MC |
687 | if (iscsi_prep_mgmt_task(conn, task)) |
688 | goto free_task; | |
052d0144 | 689 | |
9c19a7d0 | 690 | if (session->tt->xmit_task(task)) |
577577da | 691 | goto free_task; |
3bbaaad9 MC |
692 | } else { |
693 | list_add_tail(&task->running, &conn->mgmtqueue); | |
32ae763e | 694 | iscsi_conn_queue_work(conn); |
3bbaaad9 | 695 | } |
052d0144 | 696 | |
9c19a7d0 | 697 | return task; |
577577da MC |
698 | |
699 | free_task: | |
700 | __iscsi_put_task(task); | |
701 | return NULL; | |
f6d5180c MC |
702 | } |
703 | ||
704 | int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr, | |
705 | char *data, uint32_t data_size) | |
706 | { | |
707 | struct iscsi_conn *conn = cls_conn->dd_data; | |
708 | struct iscsi_session *session = conn->session; | |
709 | int err = 0; | |
710 | ||
711 | spin_lock_bh(&session->lock); | |
712 | if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size)) | |
713 | err = -EPERM; | |
714 | spin_unlock_bh(&session->lock); | |
f6d5180c MC |
715 | return err; |
716 | } | |
717 | EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu); | |
718 | ||
7996a778 MC |
719 | /** |
720 | * iscsi_cmd_rsp - SCSI Command Response processing | |
721 | * @conn: iscsi connection | |
722 | * @hdr: iscsi header | |
9c19a7d0 | 723 | * @task: scsi command task |
7996a778 MC |
724 | * @data: cmd data buffer |
725 | * @datalen: len of buffer | |
726 | * | |
727 | * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and | |
9c19a7d0 | 728 | * then completes the command and task. |
7996a778 | 729 | **/ |
77a23c21 | 730 | static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
9c19a7d0 | 731 | struct iscsi_task *task, char *data, |
77a23c21 | 732 | int datalen) |
7996a778 | 733 | { |
7996a778 MC |
734 | struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)hdr; |
735 | struct iscsi_session *session = conn->session; | |
9c19a7d0 | 736 | struct scsi_cmnd *sc = task->sc; |
7996a778 | 737 | |
77a23c21 | 738 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr); |
7996a778 MC |
739 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; |
740 | ||
741 | sc->result = (DID_OK << 16) | rhdr->cmd_status; | |
742 | ||
743 | if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) { | |
744 | sc->result = DID_ERROR << 16; | |
745 | goto out; | |
746 | } | |
747 | ||
748 | if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) { | |
9b80cb4b | 749 | uint16_t senselen; |
7996a778 MC |
750 | |
751 | if (datalen < 2) { | |
752 | invalid_datalen: | |
322d739d MC |
753 | iscsi_conn_printk(KERN_ERR, conn, |
754 | "Got CHECK_CONDITION but invalid data " | |
755 | "buffer size of %d\n", datalen); | |
7996a778 MC |
756 | sc->result = DID_BAD_TARGET << 16; |
757 | goto out; | |
758 | } | |
759 | ||
8f333991 | 760 | senselen = get_unaligned_be16(data); |
7996a778 MC |
761 | if (datalen < senselen) |
762 | goto invalid_datalen; | |
763 | ||
764 | memcpy(sc->sense_buffer, data + 2, | |
9b80cb4b | 765 | min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE)); |
1b2c7af8 MC |
766 | ISCSI_DBG_SESSION(session, "copied %d bytes of sense\n", |
767 | min_t(uint16_t, senselen, | |
768 | SCSI_SENSE_BUFFERSIZE)); | |
7996a778 MC |
769 | } |
770 | ||
c07d4444 BH |
771 | if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW | |
772 | ISCSI_FLAG_CMD_BIDI_OVERFLOW)) { | |
773 | int res_count = be32_to_cpu(rhdr->bi_residual_count); | |
774 | ||
775 | if (scsi_bidi_cmnd(sc) && res_count > 0 && | |
776 | (rhdr->flags & ISCSI_FLAG_CMD_BIDI_OVERFLOW || | |
777 | res_count <= scsi_in(sc)->length)) | |
778 | scsi_in(sc)->resid = res_count; | |
779 | else | |
780 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
781 | } | |
782 | ||
7207fea4 BH |
783 | if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW | |
784 | ISCSI_FLAG_CMD_OVERFLOW)) { | |
7996a778 MC |
785 | int res_count = be32_to_cpu(rhdr->residual_count); |
786 | ||
7207fea4 BH |
787 | if (res_count > 0 && |
788 | (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || | |
789 | res_count <= scsi_bufflen(sc))) | |
c07d4444 | 790 | /* write side for bidi or uni-io set_resid */ |
1c138991 | 791 | scsi_set_resid(sc, res_count); |
7996a778 MC |
792 | else |
793 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
c07d4444 | 794 | } |
7996a778 | 795 | out: |
3bbaaad9 | 796 | ISCSI_DBG_SESSION(session, "cmd rsp done [sc %p res %d itt 0x%x]\n", |
1b2c7af8 | 797 | sc, sc->result, task->itt); |
7996a778 | 798 | conn->scsirsp_pdus_cnt++; |
b3cd5050 | 799 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); |
7996a778 MC |
800 | } |
801 | ||
1d9edf02 MC |
802 | /** |
803 | * iscsi_data_in_rsp - SCSI Data-In Response processing | |
804 | * @conn: iscsi connection | |
805 | * @hdr: iscsi pdu | |
806 | * @task: scsi command task | |
807 | **/ | |
808 | static void | |
809 | iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
810 | struct iscsi_task *task) | |
811 | { | |
812 | struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)hdr; | |
813 | struct scsi_cmnd *sc = task->sc; | |
814 | ||
815 | if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS)) | |
816 | return; | |
817 | ||
edbc9aa0 | 818 | iscsi_update_cmdsn(conn->session, (struct iscsi_nopin *)hdr); |
1d9edf02 MC |
819 | sc->result = (DID_OK << 16) | rhdr->cmd_status; |
820 | conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; | |
821 | if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW | | |
822 | ISCSI_FLAG_DATA_OVERFLOW)) { | |
823 | int res_count = be32_to_cpu(rhdr->residual_count); | |
824 | ||
825 | if (res_count > 0 && | |
826 | (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || | |
827 | res_count <= scsi_in(sc)->length)) | |
828 | scsi_in(sc)->resid = res_count; | |
829 | else | |
830 | sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; | |
831 | } | |
832 | ||
3bbaaad9 MC |
833 | ISCSI_DBG_SESSION(conn->session, "data in with status done " |
834 | "[sc %p res %d itt 0x%x]\n", | |
835 | sc, sc->result, task->itt); | |
1d9edf02 | 836 | conn->scsirsp_pdus_cnt++; |
b3cd5050 | 837 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); |
1d9edf02 MC |
838 | } |
839 | ||
7ea8b828 MC |
840 | static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr) |
841 | { | |
842 | struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr; | |
843 | ||
844 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
845 | conn->tmfrsp_pdus_cnt++; | |
846 | ||
843c0a8a | 847 | if (conn->tmf_state != TMF_QUEUED) |
7ea8b828 MC |
848 | return; |
849 | ||
850 | if (tmf->response == ISCSI_TMF_RSP_COMPLETE) | |
843c0a8a | 851 | conn->tmf_state = TMF_SUCCESS; |
7ea8b828 | 852 | else if (tmf->response == ISCSI_TMF_RSP_NO_TASK) |
843c0a8a | 853 | conn->tmf_state = TMF_NOT_FOUND; |
7ea8b828 | 854 | else |
843c0a8a | 855 | conn->tmf_state = TMF_FAILED; |
7ea8b828 MC |
856 | wake_up(&conn->ehwait); |
857 | } | |
858 | ||
f6d5180c MC |
859 | static void iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr) |
860 | { | |
861 | struct iscsi_nopout hdr; | |
9c19a7d0 | 862 | struct iscsi_task *task; |
f6d5180c | 863 | |
9c19a7d0 | 864 | if (!rhdr && conn->ping_task) |
f6d5180c MC |
865 | return; |
866 | ||
867 | memset(&hdr, 0, sizeof(struct iscsi_nopout)); | |
868 | hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE; | |
869 | hdr.flags = ISCSI_FLAG_CMD_FINAL; | |
870 | ||
871 | if (rhdr) { | |
872 | memcpy(hdr.lun, rhdr->lun, 8); | |
873 | hdr.ttt = rhdr->ttt; | |
874 | hdr.itt = RESERVED_ITT; | |
875 | } else | |
876 | hdr.ttt = RESERVED_ITT; | |
877 | ||
9c19a7d0 MC |
878 | task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0); |
879 | if (!task) | |
322d739d | 880 | iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n"); |
d3acf022 MC |
881 | else if (!rhdr) { |
882 | /* only track our nops */ | |
883 | conn->ping_task = task; | |
884 | conn->last_ping = jiffies; | |
885 | } | |
f6d5180c MC |
886 | } |
887 | ||
8afa1439 MC |
888 | static int iscsi_nop_out_rsp(struct iscsi_task *task, |
889 | struct iscsi_nopin *nop, char *data, int datalen) | |
890 | { | |
891 | struct iscsi_conn *conn = task->conn; | |
892 | int rc = 0; | |
893 | ||
894 | if (conn->ping_task != task) { | |
895 | /* | |
896 | * If this is not in response to one of our | |
897 | * nops then it must be from userspace. | |
898 | */ | |
899 | if (iscsi_recv_pdu(conn->cls_conn, (struct iscsi_hdr *)nop, | |
900 | data, datalen)) | |
901 | rc = ISCSI_ERR_CONN_FAILED; | |
902 | } else | |
903 | mod_timer(&conn->transport_timer, jiffies + conn->recv_timeout); | |
904 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); | |
905 | return rc; | |
906 | } | |
907 | ||
62f38300 MC |
908 | static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
909 | char *data, int datalen) | |
910 | { | |
911 | struct iscsi_reject *reject = (struct iscsi_reject *)hdr; | |
912 | struct iscsi_hdr rejected_pdu; | |
8afa1439 | 913 | int opcode, rc = 0; |
62f38300 MC |
914 | |
915 | conn->exp_statsn = be32_to_cpu(reject->statsn) + 1; | |
916 | ||
8afa1439 MC |
917 | if (ntoh24(reject->dlength) > datalen || |
918 | ntoh24(reject->dlength) < sizeof(struct iscsi_hdr)) { | |
919 | iscsi_conn_printk(KERN_ERR, conn, "Cannot handle rejected " | |
920 | "pdu. Invalid data length (pdu dlength " | |
921 | "%u, datalen %d\n", ntoh24(reject->dlength), | |
922 | datalen); | |
923 | return ISCSI_ERR_PROTO; | |
924 | } | |
925 | memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr)); | |
926 | opcode = rejected_pdu.opcode & ISCSI_OPCODE_MASK; | |
927 | ||
928 | switch (reject->reason) { | |
929 | case ISCSI_REASON_DATA_DIGEST_ERROR: | |
930 | iscsi_conn_printk(KERN_ERR, conn, | |
931 | "pdu (op 0x%x itt 0x%x) rejected " | |
932 | "due to DataDigest error.\n", | |
933 | rejected_pdu.itt, opcode); | |
934 | break; | |
935 | case ISCSI_REASON_IMM_CMD_REJECT: | |
936 | iscsi_conn_printk(KERN_ERR, conn, | |
937 | "pdu (op 0x%x itt 0x%x) rejected. Too many " | |
938 | "immediate commands.\n", | |
939 | rejected_pdu.itt, opcode); | |
940 | /* | |
941 | * We only send one TMF at a time so if the target could not | |
942 | * handle it, then it should get fixed (RFC mandates that | |
943 | * a target can handle one immediate TMF per conn). | |
944 | * | |
945 | * For nops-outs, we could have sent more than one if | |
946 | * the target is sending us lots of nop-ins | |
947 | */ | |
948 | if (opcode != ISCSI_OP_NOOP_OUT) | |
949 | return 0; | |
62f38300 | 950 | |
8afa1439 MC |
951 | if (rejected_pdu.itt == cpu_to_be32(ISCSI_RESERVED_TAG)) |
952 | /* | |
953 | * nop-out in response to target's nop-out rejected. | |
954 | * Just resend. | |
955 | */ | |
956 | iscsi_send_nopout(conn, | |
957 | (struct iscsi_nopin*)&rejected_pdu); | |
958 | else { | |
959 | struct iscsi_task *task; | |
960 | /* | |
961 | * Our nop as ping got dropped. We know the target | |
962 | * and transport are ok so just clean up | |
963 | */ | |
964 | task = iscsi_itt_to_task(conn, rejected_pdu.itt); | |
965 | if (!task) { | |
966 | iscsi_conn_printk(KERN_ERR, conn, | |
967 | "Invalid pdu reject. Could " | |
968 | "not lookup rejected task.\n"); | |
969 | rc = ISCSI_ERR_BAD_ITT; | |
970 | } else | |
971 | rc = iscsi_nop_out_rsp(task, | |
972 | (struct iscsi_nopin*)&rejected_pdu, | |
973 | NULL, 0); | |
62f38300 | 974 | } |
8afa1439 MC |
975 | break; |
976 | default: | |
977 | iscsi_conn_printk(KERN_ERR, conn, | |
978 | "pdu (op 0x%x itt 0x%x) rejected. Reason " | |
979 | "code 0x%x\n", rejected_pdu.itt, | |
980 | rejected_pdu.opcode, reject->reason); | |
981 | break; | |
62f38300 | 982 | } |
8afa1439 | 983 | return rc; |
62f38300 MC |
984 | } |
985 | ||
913e5bf4 MC |
986 | /** |
987 | * iscsi_itt_to_task - look up task by itt | |
988 | * @conn: iscsi connection | |
989 | * @itt: itt | |
990 | * | |
991 | * This should be used for mgmt tasks like login and nops, or if | |
992 | * the LDD's itt space does not include the session age. | |
993 | * | |
994 | * The session lock must be held. | |
995 | */ | |
8f9256ce | 996 | struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *conn, itt_t itt) |
913e5bf4 MC |
997 | { |
998 | struct iscsi_session *session = conn->session; | |
262ef636 | 999 | int i; |
913e5bf4 MC |
1000 | |
1001 | if (itt == RESERVED_ITT) | |
1002 | return NULL; | |
1003 | ||
262ef636 MC |
1004 | if (session->tt->parse_pdu_itt) |
1005 | session->tt->parse_pdu_itt(conn, itt, &i, NULL); | |
1006 | else | |
1007 | i = get_itt(itt); | |
913e5bf4 MC |
1008 | if (i >= session->cmds_max) |
1009 | return NULL; | |
1010 | ||
1011 | return session->cmds[i]; | |
1012 | } | |
8f9256ce | 1013 | EXPORT_SYMBOL_GPL(iscsi_itt_to_task); |
913e5bf4 | 1014 | |
7996a778 MC |
1015 | /** |
1016 | * __iscsi_complete_pdu - complete pdu | |
1017 | * @conn: iscsi conn | |
1018 | * @hdr: iscsi header | |
1019 | * @data: data buffer | |
1020 | * @datalen: len of data buffer | |
1021 | * | |
1022 | * Completes pdu processing by freeing any resources allocated at | |
1023 | * queuecommand or send generic. session lock must be held and verify | |
1024 | * itt must have been called. | |
1025 | */ | |
913e5bf4 MC |
1026 | int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, |
1027 | char *data, int datalen) | |
7996a778 MC |
1028 | { |
1029 | struct iscsi_session *session = conn->session; | |
1030 | int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0; | |
9c19a7d0 | 1031 | struct iscsi_task *task; |
7996a778 MC |
1032 | uint32_t itt; |
1033 | ||
f6d5180c | 1034 | conn->last_recv = jiffies; |
0af967f5 MC |
1035 | rc = iscsi_verify_itt(conn, hdr->itt); |
1036 | if (rc) | |
1037 | return rc; | |
1038 | ||
b4377356 AV |
1039 | if (hdr->itt != RESERVED_ITT) |
1040 | itt = get_itt(hdr->itt); | |
7996a778 | 1041 | else |
b4377356 | 1042 | itt = ~0U; |
7996a778 | 1043 | |
1b2c7af8 MC |
1044 | ISCSI_DBG_SESSION(session, "[op 0x%x cid %d itt 0x%x len %d]\n", |
1045 | opcode, conn->id, itt, datalen); | |
7996a778 | 1046 | |
3e5c28ad | 1047 | if (itt == ~0U) { |
77a23c21 | 1048 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); |
62f38300 | 1049 | |
7996a778 MC |
1050 | switch(opcode) { |
1051 | case ISCSI_OP_NOOP_IN: | |
40527afe | 1052 | if (datalen) { |
7996a778 | 1053 | rc = ISCSI_ERR_PROTO; |
40527afe MC |
1054 | break; |
1055 | } | |
1056 | ||
b4377356 | 1057 | if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG)) |
40527afe MC |
1058 | break; |
1059 | ||
f6d5180c | 1060 | iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr); |
7996a778 MC |
1061 | break; |
1062 | case ISCSI_OP_REJECT: | |
62f38300 MC |
1063 | rc = iscsi_handle_reject(conn, hdr, data, datalen); |
1064 | break; | |
7996a778 | 1065 | case ISCSI_OP_ASYNC_EVENT: |
8d2860b3 | 1066 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; |
5831c737 MC |
1067 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) |
1068 | rc = ISCSI_ERR_CONN_FAILED; | |
7996a778 MC |
1069 | break; |
1070 | default: | |
1071 | rc = ISCSI_ERR_BAD_OPCODE; | |
1072 | break; | |
1073 | } | |
3e5c28ad MC |
1074 | goto out; |
1075 | } | |
1076 | ||
3e5c28ad MC |
1077 | switch(opcode) { |
1078 | case ISCSI_OP_SCSI_CMD_RSP: | |
913e5bf4 MC |
1079 | case ISCSI_OP_SCSI_DATA_IN: |
1080 | task = iscsi_itt_to_ctask(conn, hdr->itt); | |
1081 | if (!task) | |
1082 | return ISCSI_ERR_BAD_ITT; | |
d355e57d | 1083 | task->last_xfer = jiffies; |
913e5bf4 MC |
1084 | break; |
1085 | case ISCSI_OP_R2T: | |
1086 | /* | |
1087 | * LLD handles R2Ts if they need to. | |
1088 | */ | |
1089 | return 0; | |
1090 | case ISCSI_OP_LOGOUT_RSP: | |
1091 | case ISCSI_OP_LOGIN_RSP: | |
1092 | case ISCSI_OP_TEXT_RSP: | |
1093 | case ISCSI_OP_SCSI_TMFUNC_RSP: | |
1094 | case ISCSI_OP_NOOP_IN: | |
1095 | task = iscsi_itt_to_task(conn, hdr->itt); | |
1096 | if (!task) | |
1097 | return ISCSI_ERR_BAD_ITT; | |
1098 | break; | |
1099 | default: | |
1100 | return ISCSI_ERR_BAD_OPCODE; | |
1101 | } | |
1102 | ||
1103 | switch(opcode) { | |
1104 | case ISCSI_OP_SCSI_CMD_RSP: | |
9c19a7d0 | 1105 | iscsi_scsi_cmd_rsp(conn, hdr, task, data, datalen); |
3e5c28ad MC |
1106 | break; |
1107 | case ISCSI_OP_SCSI_DATA_IN: | |
1d9edf02 | 1108 | iscsi_data_in_rsp(conn, hdr, task); |
3e5c28ad | 1109 | break; |
3e5c28ad MC |
1110 | case ISCSI_OP_LOGOUT_RSP: |
1111 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
1112 | if (datalen) { | |
1113 | rc = ISCSI_ERR_PROTO; | |
1114 | break; | |
1115 | } | |
1116 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
1117 | goto recv_pdu; | |
1118 | case ISCSI_OP_LOGIN_RSP: | |
1119 | case ISCSI_OP_TEXT_RSP: | |
1120 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
1121 | /* | |
1122 | * login related PDU's exp_statsn is handled in | |
1123 | * userspace | |
1124 | */ | |
1125 | goto recv_pdu; | |
1126 | case ISCSI_OP_SCSI_TMFUNC_RSP: | |
1127 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
1128 | if (datalen) { | |
1129 | rc = ISCSI_ERR_PROTO; | |
1130 | break; | |
1131 | } | |
1132 | ||
1133 | iscsi_tmf_rsp(conn, hdr); | |
b3cd5050 | 1134 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); |
3e5c28ad MC |
1135 | break; |
1136 | case ISCSI_OP_NOOP_IN: | |
1137 | iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); | |
1138 | if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) { | |
1139 | rc = ISCSI_ERR_PROTO; | |
1140 | break; | |
1141 | } | |
1142 | conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; | |
1143 | ||
8afa1439 MC |
1144 | rc = iscsi_nop_out_rsp(task, (struct iscsi_nopin*)hdr, |
1145 | data, datalen); | |
3e5c28ad MC |
1146 | break; |
1147 | default: | |
1148 | rc = ISCSI_ERR_BAD_OPCODE; | |
1149 | break; | |
1150 | } | |
7996a778 | 1151 | |
3e5c28ad MC |
1152 | out: |
1153 | return rc; | |
1154 | recv_pdu: | |
1155 | if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) | |
1156 | rc = ISCSI_ERR_CONN_FAILED; | |
b3cd5050 | 1157 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); |
7996a778 MC |
1158 | return rc; |
1159 | } | |
913e5bf4 | 1160 | EXPORT_SYMBOL_GPL(__iscsi_complete_pdu); |
7996a778 MC |
1161 | |
1162 | int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, | |
1163 | char *data, int datalen) | |
1164 | { | |
1165 | int rc; | |
1166 | ||
1167 | spin_lock(&conn->session->lock); | |
1168 | rc = __iscsi_complete_pdu(conn, hdr, data, datalen); | |
1169 | spin_unlock(&conn->session->lock); | |
1170 | return rc; | |
1171 | } | |
1172 | EXPORT_SYMBOL_GPL(iscsi_complete_pdu); | |
1173 | ||
0af967f5 | 1174 | int iscsi_verify_itt(struct iscsi_conn *conn, itt_t itt) |
7996a778 MC |
1175 | { |
1176 | struct iscsi_session *session = conn->session; | |
262ef636 | 1177 | int age = 0, i = 0; |
7996a778 | 1178 | |
0af967f5 MC |
1179 | if (itt == RESERVED_ITT) |
1180 | return 0; | |
7996a778 | 1181 | |
262ef636 MC |
1182 | if (session->tt->parse_pdu_itt) |
1183 | session->tt->parse_pdu_itt(conn, itt, &i, &age); | |
1184 | else { | |
1185 | i = get_itt(itt); | |
1186 | age = ((__force u32)itt >> ISCSI_AGE_SHIFT) & ISCSI_AGE_MASK; | |
1187 | } | |
1188 | ||
1189 | if (age != session->age) { | |
0af967f5 MC |
1190 | iscsi_conn_printk(KERN_ERR, conn, |
1191 | "received itt %x expected session age (%x)\n", | |
913e5bf4 | 1192 | (__force u32)itt, session->age); |
0af967f5 MC |
1193 | return ISCSI_ERR_BAD_ITT; |
1194 | } | |
7996a778 | 1195 | |
3e5c28ad MC |
1196 | if (i >= session->cmds_max) { |
1197 | iscsi_conn_printk(KERN_ERR, conn, | |
1198 | "received invalid itt index %u (max cmds " | |
1199 | "%u.\n", i, session->cmds_max); | |
1200 | return ISCSI_ERR_BAD_ITT; | |
7996a778 | 1201 | } |
7996a778 MC |
1202 | return 0; |
1203 | } | |
1204 | EXPORT_SYMBOL_GPL(iscsi_verify_itt); | |
1205 | ||
913e5bf4 MC |
1206 | /** |
1207 | * iscsi_itt_to_ctask - look up ctask by itt | |
1208 | * @conn: iscsi connection | |
1209 | * @itt: itt | |
1210 | * | |
1211 | * This should be used for cmd tasks. | |
1212 | * | |
1213 | * The session lock must be held. | |
1214 | */ | |
1215 | struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *conn, itt_t itt) | |
0af967f5 | 1216 | { |
9c19a7d0 | 1217 | struct iscsi_task *task; |
0af967f5 MC |
1218 | |
1219 | if (iscsi_verify_itt(conn, itt)) | |
1220 | return NULL; | |
1221 | ||
913e5bf4 MC |
1222 | task = iscsi_itt_to_task(conn, itt); |
1223 | if (!task || !task->sc) | |
0af967f5 MC |
1224 | return NULL; |
1225 | ||
913e5bf4 MC |
1226 | if (task->sc->SCp.phase != conn->session->age) { |
1227 | iscsi_session_printk(KERN_ERR, conn->session, | |
1228 | "task's session age %d, expected %d\n", | |
1229 | task->sc->SCp.phase, conn->session->age); | |
0af967f5 | 1230 | return NULL; |
913e5bf4 | 1231 | } |
0af967f5 | 1232 | |
9c19a7d0 | 1233 | return task; |
0af967f5 MC |
1234 | } |
1235 | EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask); | |
1236 | ||
40a06e75 | 1237 | void iscsi_session_failure(struct iscsi_session *session, |
e5bd7b54 MC |
1238 | enum iscsi_err err) |
1239 | { | |
e5bd7b54 MC |
1240 | struct iscsi_conn *conn; |
1241 | struct device *dev; | |
1242 | unsigned long flags; | |
1243 | ||
1244 | spin_lock_irqsave(&session->lock, flags); | |
1245 | conn = session->leadconn; | |
1246 | if (session->state == ISCSI_STATE_TERMINATE || !conn) { | |
1247 | spin_unlock_irqrestore(&session->lock, flags); | |
1248 | return; | |
1249 | } | |
1250 | ||
1251 | dev = get_device(&conn->cls_conn->dev); | |
1252 | spin_unlock_irqrestore(&session->lock, flags); | |
1253 | if (!dev) | |
1254 | return; | |
1255 | /* | |
1256 | * if the host is being removed bypass the connection | |
1257 | * recovery initialization because we are going to kill | |
1258 | * the session. | |
1259 | */ | |
1260 | if (err == ISCSI_ERR_INVALID_HOST) | |
1261 | iscsi_conn_error_event(conn->cls_conn, err); | |
1262 | else | |
1263 | iscsi_conn_failure(conn, err); | |
1264 | put_device(dev); | |
1265 | } | |
1266 | EXPORT_SYMBOL_GPL(iscsi_session_failure); | |
1267 | ||
7996a778 MC |
1268 | void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err) |
1269 | { | |
1270 | struct iscsi_session *session = conn->session; | |
1271 | unsigned long flags; | |
1272 | ||
1273 | spin_lock_irqsave(&session->lock, flags); | |
656cffc9 MC |
1274 | if (session->state == ISCSI_STATE_FAILED) { |
1275 | spin_unlock_irqrestore(&session->lock, flags); | |
1276 | return; | |
1277 | } | |
1278 | ||
67a61114 | 1279 | if (conn->stop_stage == 0) |
7996a778 MC |
1280 | session->state = ISCSI_STATE_FAILED; |
1281 | spin_unlock_irqrestore(&session->lock, flags); | |
e5bd7b54 | 1282 | |
7996a778 MC |
1283 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); |
1284 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
e5bd7b54 | 1285 | iscsi_conn_error_event(conn->cls_conn, err); |
7996a778 MC |
1286 | } |
1287 | EXPORT_SYMBOL_GPL(iscsi_conn_failure); | |
1288 | ||
77a23c21 MC |
1289 | static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn) |
1290 | { | |
1291 | struct iscsi_session *session = conn->session; | |
1292 | ||
1293 | /* | |
1294 | * Check for iSCSI window and take care of CmdSN wrap-around | |
1295 | */ | |
e0726407 | 1296 | if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) { |
1b2c7af8 MC |
1297 | ISCSI_DBG_SESSION(session, "iSCSI CmdSN closed. ExpCmdSn " |
1298 | "%u MaxCmdSN %u CmdSN %u/%u\n", | |
1299 | session->exp_cmdsn, session->max_cmdsn, | |
1300 | session->cmdsn, session->queued_cmdsn); | |
77a23c21 MC |
1301 | return -ENOSPC; |
1302 | } | |
1303 | return 0; | |
1304 | } | |
1305 | ||
9c19a7d0 | 1306 | static int iscsi_xmit_task(struct iscsi_conn *conn) |
77a23c21 | 1307 | { |
9c19a7d0 | 1308 | struct iscsi_task *task = conn->task; |
843c0a8a | 1309 | int rc; |
77a23c21 | 1310 | |
70b31c15 MC |
1311 | if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) |
1312 | return -ENODATA; | |
1313 | ||
9c19a7d0 | 1314 | __iscsi_get_task(task); |
77a23c21 | 1315 | spin_unlock_bh(&conn->session->lock); |
9c19a7d0 | 1316 | rc = conn->session->tt->xmit_task(task); |
77a23c21 | 1317 | spin_lock_bh(&conn->session->lock); |
d355e57d | 1318 | if (!rc) { |
9c19a7d0 | 1319 | /* done with this task */ |
d355e57d | 1320 | task->last_xfer = jiffies; |
9c19a7d0 | 1321 | conn->task = NULL; |
d355e57d MC |
1322 | } |
1323 | __iscsi_put_task(task); | |
77a23c21 MC |
1324 | return rc; |
1325 | } | |
1326 | ||
843c0a8a | 1327 | /** |
9c19a7d0 MC |
1328 | * iscsi_requeue_task - requeue task to run from session workqueue |
1329 | * @task: task to requeue | |
843c0a8a | 1330 | * |
9c19a7d0 | 1331 | * LLDs that need to run a task from the session workqueue should call |
052d0144 MC |
1332 | * this. The session lock must be held. This should only be called |
1333 | * by software drivers. | |
843c0a8a | 1334 | */ |
9c19a7d0 | 1335 | void iscsi_requeue_task(struct iscsi_task *task) |
843c0a8a | 1336 | { |
9c19a7d0 | 1337 | struct iscsi_conn *conn = task->conn; |
843c0a8a | 1338 | |
3bbaaad9 MC |
1339 | /* |
1340 | * this may be on the requeue list already if the xmit_task callout | |
1341 | * is handling the r2ts while we are adding new ones | |
1342 | */ | |
1343 | if (list_empty(&task->running)) | |
1344 | list_add_tail(&task->running, &conn->requeue); | |
32ae763e | 1345 | iscsi_conn_queue_work(conn); |
843c0a8a | 1346 | } |
9c19a7d0 | 1347 | EXPORT_SYMBOL_GPL(iscsi_requeue_task); |
843c0a8a | 1348 | |
7996a778 MC |
1349 | /** |
1350 | * iscsi_data_xmit - xmit any command into the scheduled connection | |
1351 | * @conn: iscsi connection | |
1352 | * | |
1353 | * Notes: | |
1354 | * The function can return -EAGAIN in which case the caller must | |
1355 | * re-schedule it again later or recover. '0' return code means | |
1356 | * successful xmit. | |
1357 | **/ | |
1358 | static int iscsi_data_xmit(struct iscsi_conn *conn) | |
1359 | { | |
3219e529 | 1360 | int rc = 0; |
7996a778 | 1361 | |
77a23c21 | 1362 | spin_lock_bh(&conn->session->lock); |
70b31c15 | 1363 | if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) { |
1b2c7af8 | 1364 | ISCSI_DBG_SESSION(conn->session, "Tx suspended!\n"); |
77a23c21 | 1365 | spin_unlock_bh(&conn->session->lock); |
3219e529 | 1366 | return -ENODATA; |
7996a778 | 1367 | } |
7996a778 | 1368 | |
9c19a7d0 MC |
1369 | if (conn->task) { |
1370 | rc = iscsi_xmit_task(conn); | |
3219e529 | 1371 | if (rc) |
70b31c15 | 1372 | goto done; |
7996a778 MC |
1373 | } |
1374 | ||
77a23c21 MC |
1375 | /* |
1376 | * process mgmt pdus like nops before commands since we should | |
1377 | * only have one nop-out as a ping from us and targets should not | |
1378 | * overflow us with nop-ins | |
1379 | */ | |
1380 | check_mgmt: | |
843c0a8a | 1381 | while (!list_empty(&conn->mgmtqueue)) { |
9c19a7d0 MC |
1382 | conn->task = list_entry(conn->mgmtqueue.next, |
1383 | struct iscsi_task, running); | |
3bbaaad9 | 1384 | list_del_init(&conn->task->running); |
9c19a7d0 MC |
1385 | if (iscsi_prep_mgmt_task(conn, conn->task)) { |
1386 | __iscsi_put_task(conn->task); | |
1387 | conn->task = NULL; | |
b3a7ea8d MC |
1388 | continue; |
1389 | } | |
9c19a7d0 | 1390 | rc = iscsi_xmit_task(conn); |
77a23c21 | 1391 | if (rc) |
70b31c15 | 1392 | goto done; |
7996a778 MC |
1393 | } |
1394 | ||
843c0a8a | 1395 | /* process pending command queue */ |
3bbaaad9 | 1396 | while (!list_empty(&conn->cmdqueue)) { |
843c0a8a MC |
1397 | if (conn->tmf_state == TMF_QUEUED) |
1398 | break; | |
1399 | ||
3bbaaad9 | 1400 | conn->task = list_entry(conn->cmdqueue.next, |
9c19a7d0 | 1401 | struct iscsi_task, running); |
3bbaaad9 | 1402 | list_del_init(&conn->task->running); |
b3a7ea8d | 1403 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) { |
b3cd5050 | 1404 | fail_scsi_task(conn->task, DID_IMM_RETRY); |
b3a7ea8d MC |
1405 | continue; |
1406 | } | |
577577da MC |
1407 | rc = iscsi_prep_scsi_cmd_pdu(conn->task); |
1408 | if (rc) { | |
1409 | if (rc == -ENOMEM) { | |
3bbaaad9 MC |
1410 | list_add_tail(&conn->task->running, |
1411 | &conn->cmdqueue); | |
577577da | 1412 | conn->task = NULL; |
70b31c15 | 1413 | goto done; |
577577da | 1414 | } else |
b3cd5050 | 1415 | fail_scsi_task(conn->task, DID_ABORT); |
004d6530 BH |
1416 | continue; |
1417 | } | |
9c19a7d0 | 1418 | rc = iscsi_xmit_task(conn); |
77a23c21 | 1419 | if (rc) |
70b31c15 | 1420 | goto done; |
77a23c21 | 1421 | /* |
9c19a7d0 | 1422 | * we could continuously get new task requests so |
77a23c21 MC |
1423 | * we need to check the mgmt queue for nops that need to |
1424 | * be sent to aviod starvation | |
1425 | */ | |
843c0a8a MC |
1426 | if (!list_empty(&conn->mgmtqueue)) |
1427 | goto check_mgmt; | |
1428 | } | |
1429 | ||
1430 | while (!list_empty(&conn->requeue)) { | |
1431 | if (conn->session->fast_abort && conn->tmf_state != TMF_INITIAL) | |
1432 | break; | |
1433 | ||
b3a7ea8d MC |
1434 | /* |
1435 | * we always do fastlogout - conn stop code will clean up. | |
1436 | */ | |
1437 | if (conn->session->state == ISCSI_STATE_LOGGING_OUT) | |
1438 | break; | |
1439 | ||
9c19a7d0 MC |
1440 | conn->task = list_entry(conn->requeue.next, |
1441 | struct iscsi_task, running); | |
3bbaaad9 | 1442 | list_del_init(&conn->task->running); |
9c19a7d0 | 1443 | conn->task->state = ISCSI_TASK_RUNNING; |
9c19a7d0 | 1444 | rc = iscsi_xmit_task(conn); |
843c0a8a | 1445 | if (rc) |
70b31c15 | 1446 | goto done; |
843c0a8a | 1447 | if (!list_empty(&conn->mgmtqueue)) |
77a23c21 | 1448 | goto check_mgmt; |
7996a778 | 1449 | } |
b6c395ed | 1450 | spin_unlock_bh(&conn->session->lock); |
3219e529 | 1451 | return -ENODATA; |
7996a778 | 1452 | |
70b31c15 | 1453 | done: |
77a23c21 | 1454 | spin_unlock_bh(&conn->session->lock); |
3219e529 | 1455 | return rc; |
7996a778 MC |
1456 | } |
1457 | ||
c4028958 | 1458 | static void iscsi_xmitworker(struct work_struct *work) |
7996a778 | 1459 | { |
c4028958 DH |
1460 | struct iscsi_conn *conn = |
1461 | container_of(work, struct iscsi_conn, xmitwork); | |
3219e529 | 1462 | int rc; |
7996a778 MC |
1463 | /* |
1464 | * serialize Xmit worker on a per-connection basis. | |
1465 | */ | |
3219e529 MC |
1466 | do { |
1467 | rc = iscsi_data_xmit(conn); | |
1468 | } while (rc >= 0 || rc == -EAGAIN); | |
7996a778 MC |
1469 | } |
1470 | ||
577577da MC |
1471 | static inline struct iscsi_task *iscsi_alloc_task(struct iscsi_conn *conn, |
1472 | struct scsi_cmnd *sc) | |
1473 | { | |
1474 | struct iscsi_task *task; | |
1475 | ||
1476 | if (!__kfifo_get(conn->session->cmdpool.queue, | |
1477 | (void *) &task, sizeof(void *))) | |
1478 | return NULL; | |
1479 | ||
1480 | sc->SCp.phase = conn->session->age; | |
1481 | sc->SCp.ptr = (char *) task; | |
1482 | ||
1483 | atomic_set(&task->refcount, 1); | |
1484 | task->state = ISCSI_TASK_PENDING; | |
1485 | task->conn = conn; | |
1486 | task->sc = sc; | |
d355e57d MC |
1487 | task->have_checked_conn = false; |
1488 | task->last_timeout = jiffies; | |
1489 | task->last_xfer = jiffies; | |
577577da MC |
1490 | INIT_LIST_HEAD(&task->running); |
1491 | return task; | |
1492 | } | |
1493 | ||
7996a778 MC |
1494 | enum { |
1495 | FAILURE_BAD_HOST = 1, | |
1496 | FAILURE_SESSION_FAILED, | |
1497 | FAILURE_SESSION_FREED, | |
1498 | FAILURE_WINDOW_CLOSED, | |
60ecebf5 | 1499 | FAILURE_OOM, |
7996a778 | 1500 | FAILURE_SESSION_TERMINATE, |
656cffc9 | 1501 | FAILURE_SESSION_IN_RECOVERY, |
7996a778 | 1502 | FAILURE_SESSION_RECOVERY_TIMEOUT, |
b3a7ea8d | 1503 | FAILURE_SESSION_LOGGING_OUT, |
6eabafbe | 1504 | FAILURE_SESSION_NOT_READY, |
7996a778 MC |
1505 | }; |
1506 | ||
1507 | int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *)) | |
1508 | { | |
75613521 | 1509 | struct iscsi_cls_session *cls_session; |
7996a778 | 1510 | struct Scsi_Host *host; |
1336aed1 | 1511 | struct iscsi_host *ihost; |
7996a778 MC |
1512 | int reason = 0; |
1513 | struct iscsi_session *session; | |
1514 | struct iscsi_conn *conn; | |
9c19a7d0 | 1515 | struct iscsi_task *task = NULL; |
7996a778 MC |
1516 | |
1517 | sc->scsi_done = done; | |
1518 | sc->result = 0; | |
f47f2cf5 | 1519 | sc->SCp.ptr = NULL; |
7996a778 MC |
1520 | |
1521 | host = sc->device->host; | |
1336aed1 | 1522 | ihost = shost_priv(host); |
1040c99d | 1523 | spin_unlock(host->host_lock); |
7996a778 | 1524 | |
75613521 MC |
1525 | cls_session = starget_to_session(scsi_target(sc->device)); |
1526 | session = cls_session->dd_data; | |
7996a778 MC |
1527 | spin_lock(&session->lock); |
1528 | ||
75613521 | 1529 | reason = iscsi_session_chkready(cls_session); |
6eabafbe MC |
1530 | if (reason) { |
1531 | sc->result = reason; | |
1532 | goto fault; | |
1533 | } | |
1534 | ||
301e0f7e | 1535 | if (session->state != ISCSI_STATE_LOGGED_IN) { |
656cffc9 MC |
1536 | /* |
1537 | * to handle the race between when we set the recovery state | |
1538 | * and block the session we requeue here (commands could | |
1539 | * be entering our queuecommand while a block is starting | |
1540 | * up because the block code is not locked) | |
1541 | */ | |
9000bcd6 | 1542 | switch (session->state) { |
301e0f7e | 1543 | case ISCSI_STATE_FAILED: |
9000bcd6 | 1544 | case ISCSI_STATE_IN_RECOVERY: |
656cffc9 | 1545 | reason = FAILURE_SESSION_IN_RECOVERY; |
301e0f7e MC |
1546 | sc->result = DID_IMM_RETRY << 16; |
1547 | break; | |
9000bcd6 MC |
1548 | case ISCSI_STATE_LOGGING_OUT: |
1549 | reason = FAILURE_SESSION_LOGGING_OUT; | |
301e0f7e MC |
1550 | sc->result = DID_IMM_RETRY << 16; |
1551 | break; | |
b3a7ea8d | 1552 | case ISCSI_STATE_RECOVERY_FAILED: |
656cffc9 | 1553 | reason = FAILURE_SESSION_RECOVERY_TIMEOUT; |
56d7fcfa | 1554 | sc->result = DID_TRANSPORT_FAILFAST << 16; |
b3a7ea8d MC |
1555 | break; |
1556 | case ISCSI_STATE_TERMINATE: | |
656cffc9 | 1557 | reason = FAILURE_SESSION_TERMINATE; |
6eabafbe | 1558 | sc->result = DID_NO_CONNECT << 16; |
b3a7ea8d | 1559 | break; |
b3a7ea8d | 1560 | default: |
656cffc9 | 1561 | reason = FAILURE_SESSION_FREED; |
6eabafbe | 1562 | sc->result = DID_NO_CONNECT << 16; |
b3a7ea8d | 1563 | } |
7996a778 MC |
1564 | goto fault; |
1565 | } | |
1566 | ||
7996a778 | 1567 | conn = session->leadconn; |
98644047 MC |
1568 | if (!conn) { |
1569 | reason = FAILURE_SESSION_FREED; | |
6eabafbe | 1570 | sc->result = DID_NO_CONNECT << 16; |
98644047 MC |
1571 | goto fault; |
1572 | } | |
7996a778 | 1573 | |
661134ad MC |
1574 | if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) { |
1575 | reason = FAILURE_SESSION_IN_RECOVERY; | |
1576 | sc->result = DID_REQUEUE; | |
1577 | goto fault; | |
1578 | } | |
1579 | ||
77a23c21 MC |
1580 | if (iscsi_check_cmdsn_window_closed(conn)) { |
1581 | reason = FAILURE_WINDOW_CLOSED; | |
1582 | goto reject; | |
1583 | } | |
1584 | ||
577577da MC |
1585 | task = iscsi_alloc_task(conn, sc); |
1586 | if (!task) { | |
60ecebf5 MC |
1587 | reason = FAILURE_OOM; |
1588 | goto reject; | |
1589 | } | |
7996a778 | 1590 | |
1336aed1 | 1591 | if (!ihost->workq) { |
577577da MC |
1592 | reason = iscsi_prep_scsi_cmd_pdu(task); |
1593 | if (reason) { | |
1594 | if (reason == -ENOMEM) { | |
1595 | reason = FAILURE_OOM; | |
1596 | goto prepd_reject; | |
1597 | } else { | |
1598 | sc->result = DID_ABORT << 16; | |
1599 | goto prepd_fault; | |
1600 | } | |
052d0144 | 1601 | } |
9c19a7d0 | 1602 | if (session->tt->xmit_task(task)) { |
d3305f34 | 1603 | session->cmdsn--; |
052d0144 | 1604 | reason = FAILURE_SESSION_NOT_READY; |
577577da | 1605 | goto prepd_reject; |
052d0144 | 1606 | } |
3bbaaad9 MC |
1607 | } else { |
1608 | list_add_tail(&task->running, &conn->cmdqueue); | |
32ae763e | 1609 | iscsi_conn_queue_work(conn); |
3bbaaad9 | 1610 | } |
052d0144 MC |
1611 | |
1612 | session->queued_cmdsn++; | |
1613 | spin_unlock(&session->lock); | |
1040c99d | 1614 | spin_lock(host->host_lock); |
7996a778 MC |
1615 | return 0; |
1616 | ||
577577da MC |
1617 | prepd_reject: |
1618 | sc->scsi_done = NULL; | |
b3cd5050 | 1619 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); |
7996a778 MC |
1620 | reject: |
1621 | spin_unlock(&session->lock); | |
1b2c7af8 MC |
1622 | ISCSI_DBG_SESSION(session, "cmd 0x%x rejected (%d)\n", |
1623 | sc->cmnd[0], reason); | |
1040c99d | 1624 | spin_lock(host->host_lock); |
d6d13ee1 | 1625 | return SCSI_MLQUEUE_TARGET_BUSY; |
7996a778 | 1626 | |
577577da MC |
1627 | prepd_fault: |
1628 | sc->scsi_done = NULL; | |
b3cd5050 | 1629 | iscsi_complete_task(task, ISCSI_TASK_COMPLETED); |
7996a778 MC |
1630 | fault: |
1631 | spin_unlock(&session->lock); | |
1b2c7af8 MC |
1632 | ISCSI_DBG_SESSION(session, "iscsi: cmd 0x%x is not queued (%d)\n", |
1633 | sc->cmnd[0], reason); | |
c07d4444 BH |
1634 | if (!scsi_bidi_cmnd(sc)) |
1635 | scsi_set_resid(sc, scsi_bufflen(sc)); | |
1636 | else { | |
1637 | scsi_out(sc)->resid = scsi_out(sc)->length; | |
1638 | scsi_in(sc)->resid = scsi_in(sc)->length; | |
1639 | } | |
052d0144 | 1640 | done(sc); |
1040c99d | 1641 | spin_lock(host->host_lock); |
7996a778 MC |
1642 | return 0; |
1643 | } | |
1644 | EXPORT_SYMBOL_GPL(iscsi_queuecommand); | |
1645 | ||
1646 | int iscsi_change_queue_depth(struct scsi_device *sdev, int depth) | |
1647 | { | |
7996a778 MC |
1648 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); |
1649 | return sdev->queue_depth; | |
1650 | } | |
1651 | EXPORT_SYMBOL_GPL(iscsi_change_queue_depth); | |
1652 | ||
6b5d6c44 MC |
1653 | int iscsi_target_alloc(struct scsi_target *starget) |
1654 | { | |
1655 | struct iscsi_cls_session *cls_session = starget_to_session(starget); | |
1656 | struct iscsi_session *session = cls_session->dd_data; | |
1657 | ||
1658 | starget->can_queue = session->scsi_cmds_max; | |
1659 | return 0; | |
1660 | } | |
1661 | EXPORT_SYMBOL_GPL(iscsi_target_alloc); | |
1662 | ||
7996a778 MC |
1663 | void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session) |
1664 | { | |
75613521 | 1665 | struct iscsi_session *session = cls_session->dd_data; |
7996a778 MC |
1666 | |
1667 | spin_lock_bh(&session->lock); | |
1668 | if (session->state != ISCSI_STATE_LOGGED_IN) { | |
656cffc9 | 1669 | session->state = ISCSI_STATE_RECOVERY_FAILED; |
843c0a8a MC |
1670 | if (session->leadconn) |
1671 | wake_up(&session->leadconn->ehwait); | |
7996a778 MC |
1672 | } |
1673 | spin_unlock_bh(&session->lock); | |
1674 | } | |
1675 | EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout); | |
1676 | ||
8e124525 | 1677 | int iscsi_eh_target_reset(struct scsi_cmnd *sc) |
7996a778 | 1678 | { |
75613521 MC |
1679 | struct iscsi_cls_session *cls_session; |
1680 | struct iscsi_session *session; | |
1681 | struct iscsi_conn *conn; | |
1682 | ||
1683 | cls_session = starget_to_session(scsi_target(sc->device)); | |
1684 | session = cls_session->dd_data; | |
1685 | conn = session->leadconn; | |
7996a778 | 1686 | |
bc436b27 | 1687 | mutex_lock(&session->eh_mutex); |
7996a778 MC |
1688 | spin_lock_bh(&session->lock); |
1689 | if (session->state == ISCSI_STATE_TERMINATE) { | |
1690 | failed: | |
bd2199d4 EZ |
1691 | ISCSI_DBG_EH(session, |
1692 | "failing target reset: Could not log back into " | |
1693 | "target [age %d]\n", | |
1694 | session->age); | |
7996a778 | 1695 | spin_unlock_bh(&session->lock); |
bc436b27 | 1696 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1697 | return FAILED; |
1698 | } | |
1699 | ||
7996a778 | 1700 | spin_unlock_bh(&session->lock); |
bc436b27 | 1701 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1702 | /* |
1703 | * we drop the lock here but the leadconn cannot be destoyed while | |
1704 | * we are in the scsi eh | |
1705 | */ | |
843c0a8a | 1706 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
7996a778 | 1707 | |
bd2199d4 | 1708 | ISCSI_DBG_EH(session, "wait for relogin\n"); |
7996a778 MC |
1709 | wait_event_interruptible(conn->ehwait, |
1710 | session->state == ISCSI_STATE_TERMINATE || | |
1711 | session->state == ISCSI_STATE_LOGGED_IN || | |
656cffc9 | 1712 | session->state == ISCSI_STATE_RECOVERY_FAILED); |
7996a778 MC |
1713 | if (signal_pending(current)) |
1714 | flush_signals(current); | |
1715 | ||
bc436b27 | 1716 | mutex_lock(&session->eh_mutex); |
7996a778 | 1717 | spin_lock_bh(&session->lock); |
bd2199d4 EZ |
1718 | if (session->state == ISCSI_STATE_LOGGED_IN) { |
1719 | ISCSI_DBG_EH(session, | |
1720 | "target reset succeeded\n"); | |
1721 | } else | |
7996a778 MC |
1722 | goto failed; |
1723 | spin_unlock_bh(&session->lock); | |
bc436b27 | 1724 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1725 | return SUCCESS; |
1726 | } | |
8e124525 | 1727 | EXPORT_SYMBOL_GPL(iscsi_eh_target_reset); |
7996a778 | 1728 | |
843c0a8a | 1729 | static void iscsi_tmf_timedout(unsigned long data) |
7996a778 | 1730 | { |
843c0a8a | 1731 | struct iscsi_conn *conn = (struct iscsi_conn *)data; |
7996a778 MC |
1732 | struct iscsi_session *session = conn->session; |
1733 | ||
1734 | spin_lock(&session->lock); | |
843c0a8a MC |
1735 | if (conn->tmf_state == TMF_QUEUED) { |
1736 | conn->tmf_state = TMF_TIMEDOUT; | |
bd2199d4 | 1737 | ISCSI_DBG_EH(session, "tmf timedout\n"); |
7996a778 MC |
1738 | /* unblock eh_abort() */ |
1739 | wake_up(&conn->ehwait); | |
1740 | } | |
1741 | spin_unlock(&session->lock); | |
1742 | } | |
1743 | ||
9c19a7d0 | 1744 | static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn, |
f6d5180c MC |
1745 | struct iscsi_tm *hdr, int age, |
1746 | int timeout) | |
7996a778 | 1747 | { |
7996a778 | 1748 | struct iscsi_session *session = conn->session; |
9c19a7d0 | 1749 | struct iscsi_task *task; |
7996a778 | 1750 | |
9c19a7d0 | 1751 | task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr, |
843c0a8a | 1752 | NULL, 0); |
9c19a7d0 | 1753 | if (!task) { |
6724add1 | 1754 | spin_unlock_bh(&session->lock); |
7996a778 | 1755 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); |
843c0a8a | 1756 | spin_lock_bh(&session->lock); |
bd2199d4 | 1757 | ISCSI_DBG_EH(session, "tmf exec failure\n"); |
77a23c21 | 1758 | return -EPERM; |
7996a778 | 1759 | } |
843c0a8a | 1760 | conn->tmfcmd_pdus_cnt++; |
f6d5180c | 1761 | conn->tmf_timer.expires = timeout * HZ + jiffies; |
843c0a8a MC |
1762 | conn->tmf_timer.function = iscsi_tmf_timedout; |
1763 | conn->tmf_timer.data = (unsigned long)conn; | |
1764 | add_timer(&conn->tmf_timer); | |
bd2199d4 | 1765 | ISCSI_DBG_EH(session, "tmf set timeout\n"); |
7996a778 | 1766 | |
7996a778 | 1767 | spin_unlock_bh(&session->lock); |
6724add1 | 1768 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
1769 | |
1770 | /* | |
1771 | * block eh thread until: | |
1772 | * | |
843c0a8a MC |
1773 | * 1) tmf response |
1774 | * 2) tmf timeout | |
7996a778 MC |
1775 | * 3) session is terminated or restarted or userspace has |
1776 | * given up on recovery | |
1777 | */ | |
843c0a8a | 1778 | wait_event_interruptible(conn->ehwait, age != session->age || |
7996a778 | 1779 | session->state != ISCSI_STATE_LOGGED_IN || |
843c0a8a | 1780 | conn->tmf_state != TMF_QUEUED); |
7996a778 MC |
1781 | if (signal_pending(current)) |
1782 | flush_signals(current); | |
843c0a8a MC |
1783 | del_timer_sync(&conn->tmf_timer); |
1784 | ||
6724add1 | 1785 | mutex_lock(&session->eh_mutex); |
77a23c21 | 1786 | spin_lock_bh(&session->lock); |
9c19a7d0 | 1787 | /* if the session drops it will clean up the task */ |
843c0a8a MC |
1788 | if (age != session->age || |
1789 | session->state != ISCSI_STATE_LOGGED_IN) | |
1790 | return -ENOTCONN; | |
7996a778 MC |
1791 | return 0; |
1792 | } | |
1793 | ||
843c0a8a MC |
1794 | /* |
1795 | * Fail commands. session lock held and recv side suspended and xmit | |
1796 | * thread flushed | |
1797 | */ | |
3bbaaad9 MC |
1798 | static void fail_scsi_tasks(struct iscsi_conn *conn, unsigned lun, |
1799 | int error) | |
843c0a8a | 1800 | { |
3bbaaad9 MC |
1801 | struct iscsi_task *task; |
1802 | int i; | |
843c0a8a | 1803 | |
3bbaaad9 MC |
1804 | for (i = 0; i < conn->session->cmds_max; i++) { |
1805 | task = conn->session->cmds[i]; | |
1806 | if (!task->sc || task->state == ISCSI_TASK_FREE) | |
1807 | continue; | |
843c0a8a | 1808 | |
3bbaaad9 MC |
1809 | if (lun != -1 && lun != task->sc->device->lun) |
1810 | continue; | |
843c0a8a | 1811 | |
3bbaaad9 MC |
1812 | ISCSI_DBG_SESSION(conn->session, |
1813 | "failing sc %p itt 0x%x state %d\n", | |
1814 | task->sc, task->itt, task->state); | |
b3cd5050 | 1815 | fail_scsi_task(task, error); |
843c0a8a MC |
1816 | } |
1817 | } | |
1818 | ||
661134ad MC |
1819 | /** |
1820 | * iscsi_suspend_queue - suspend iscsi_queuecommand | |
1821 | * @conn: iscsi conn to stop queueing IO on | |
1822 | * | |
1823 | * This grabs the session lock to make sure no one is in | |
1824 | * xmit_task/queuecommand, and then sets suspend to prevent | |
1825 | * new commands from being queued. This only needs to be called | |
1826 | * by offload drivers that need to sync a path like ep disconnect | |
1827 | * with the iscsi_queuecommand/xmit_task. To start IO again libiscsi | |
1828 | * will call iscsi_start_tx and iscsi_unblock_session when in FFP. | |
1829 | */ | |
1830 | void iscsi_suspend_queue(struct iscsi_conn *conn) | |
1831 | { | |
1832 | spin_lock_bh(&conn->session->lock); | |
1833 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
1834 | spin_unlock_bh(&conn->session->lock); | |
1835 | } | |
1836 | EXPORT_SYMBOL_GPL(iscsi_suspend_queue); | |
1837 | ||
1838 | /** | |
1839 | * iscsi_suspend_tx - suspend iscsi_data_xmit | |
1840 | * @conn: iscsi conn tp stop processing IO on. | |
1841 | * | |
1842 | * This function sets the suspend bit to prevent iscsi_data_xmit | |
1843 | * from sending new IO, and if work is queued on the xmit thread | |
1844 | * it will wait for it to be completed. | |
1845 | */ | |
b40977d9 | 1846 | void iscsi_suspend_tx(struct iscsi_conn *conn) |
6724add1 | 1847 | { |
32ae763e MC |
1848 | struct Scsi_Host *shost = conn->session->host; |
1849 | struct iscsi_host *ihost = shost_priv(shost); | |
1850 | ||
6724add1 | 1851 | set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); |
1336aed1 | 1852 | if (ihost->workq) |
32ae763e | 1853 | flush_workqueue(ihost->workq); |
6724add1 | 1854 | } |
b40977d9 | 1855 | EXPORT_SYMBOL_GPL(iscsi_suspend_tx); |
6724add1 MC |
1856 | |
1857 | static void iscsi_start_tx(struct iscsi_conn *conn) | |
1858 | { | |
1859 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
1336aed1 | 1860 | iscsi_conn_queue_work(conn); |
6724add1 MC |
1861 | } |
1862 | ||
4c48a829 MC |
1863 | /* |
1864 | * We want to make sure a ping is in flight. It has timed out. | |
1865 | * And we are not busy processing a pdu that is making | |
1866 | * progress but got started before the ping and is taking a while | |
1867 | * to complete so the ping is just stuck behind it in a queue. | |
1868 | */ | |
1869 | static int iscsi_has_ping_timed_out(struct iscsi_conn *conn) | |
1870 | { | |
1871 | if (conn->ping_task && | |
1872 | time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) + | |
1873 | (conn->ping_timeout * HZ), jiffies)) | |
1874 | return 1; | |
1875 | else | |
1876 | return 0; | |
1877 | } | |
1878 | ||
d355e57d | 1879 | static enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *sc) |
f6d5180c | 1880 | { |
d355e57d MC |
1881 | enum blk_eh_timer_return rc = BLK_EH_NOT_HANDLED; |
1882 | struct iscsi_task *task = NULL; | |
f6d5180c MC |
1883 | struct iscsi_cls_session *cls_session; |
1884 | struct iscsi_session *session; | |
1885 | struct iscsi_conn *conn; | |
f6d5180c | 1886 | |
d355e57d | 1887 | cls_session = starget_to_session(scsi_target(sc->device)); |
75613521 | 1888 | session = cls_session->dd_data; |
f6d5180c | 1889 | |
bd2199d4 | 1890 | ISCSI_DBG_EH(session, "scsi cmd %p timedout\n", sc); |
f6d5180c MC |
1891 | |
1892 | spin_lock(&session->lock); | |
1893 | if (session->state != ISCSI_STATE_LOGGED_IN) { | |
1894 | /* | |
1895 | * We are probably in the middle of iscsi recovery so let | |
1896 | * that complete and handle the error. | |
1897 | */ | |
242f9dcb | 1898 | rc = BLK_EH_RESET_TIMER; |
f6d5180c MC |
1899 | goto done; |
1900 | } | |
1901 | ||
1902 | conn = session->leadconn; | |
1903 | if (!conn) { | |
1904 | /* In the middle of shuting down */ | |
242f9dcb | 1905 | rc = BLK_EH_RESET_TIMER; |
f6d5180c MC |
1906 | goto done; |
1907 | } | |
1908 | ||
d355e57d MC |
1909 | task = (struct iscsi_task *)sc->SCp.ptr; |
1910 | if (!task) | |
1911 | goto done; | |
1912 | /* | |
1913 | * If we have sent (at least queued to the network layer) a pdu or | |
1914 | * recvd one for the task since the last timeout ask for | |
1915 | * more time. If on the next timeout we have not made progress | |
1916 | * we can check if it is the task or connection when we send the | |
1917 | * nop as a ping. | |
1918 | */ | |
1919 | if (time_after_eq(task->last_xfer, task->last_timeout)) { | |
bd2199d4 EZ |
1920 | ISCSI_DBG_EH(session, "Command making progress. Asking " |
1921 | "scsi-ml for more time to complete. " | |
1922 | "Last data recv at %lu. Last timeout was at " | |
1923 | "%lu\n.", task->last_xfer, task->last_timeout); | |
d355e57d MC |
1924 | task->have_checked_conn = false; |
1925 | rc = BLK_EH_RESET_TIMER; | |
1926 | goto done; | |
1927 | } | |
1928 | ||
f6d5180c MC |
1929 | if (!conn->recv_timeout && !conn->ping_timeout) |
1930 | goto done; | |
1931 | /* | |
1932 | * if the ping timedout then we are in the middle of cleaning up | |
1933 | * and can let the iscsi eh handle it | |
1934 | */ | |
4c48a829 | 1935 | if (iscsi_has_ping_timed_out(conn)) { |
242f9dcb | 1936 | rc = BLK_EH_RESET_TIMER; |
4c48a829 MC |
1937 | goto done; |
1938 | } | |
d355e57d MC |
1939 | |
1940 | /* Assumes nop timeout is shorter than scsi cmd timeout */ | |
1941 | if (task->have_checked_conn) | |
1942 | goto done; | |
1943 | ||
f6d5180c | 1944 | /* |
d355e57d MC |
1945 | * Checking the transport already or nop from a cmd timeout still |
1946 | * running | |
f6d5180c | 1947 | */ |
d355e57d MC |
1948 | if (conn->ping_task) { |
1949 | task->have_checked_conn = true; | |
242f9dcb | 1950 | rc = BLK_EH_RESET_TIMER; |
4c48a829 MC |
1951 | goto done; |
1952 | } | |
1953 | ||
d355e57d MC |
1954 | /* Make sure there is a transport check done */ |
1955 | iscsi_send_nopout(conn, NULL); | |
1956 | task->have_checked_conn = true; | |
1957 | rc = BLK_EH_RESET_TIMER; | |
1958 | ||
f6d5180c | 1959 | done: |
d355e57d MC |
1960 | if (task) |
1961 | task->last_timeout = jiffies; | |
f6d5180c | 1962 | spin_unlock(&session->lock); |
bd2199d4 EZ |
1963 | ISCSI_DBG_EH(session, "return %s\n", rc == BLK_EH_RESET_TIMER ? |
1964 | "timer reset" : "nh"); | |
f6d5180c MC |
1965 | return rc; |
1966 | } | |
1967 | ||
1968 | static void iscsi_check_transport_timeouts(unsigned long data) | |
1969 | { | |
1970 | struct iscsi_conn *conn = (struct iscsi_conn *)data; | |
1971 | struct iscsi_session *session = conn->session; | |
4cf10435 | 1972 | unsigned long recv_timeout, next_timeout = 0, last_recv; |
f6d5180c MC |
1973 | |
1974 | spin_lock(&session->lock); | |
1975 | if (session->state != ISCSI_STATE_LOGGED_IN) | |
1976 | goto done; | |
1977 | ||
4cf10435 MC |
1978 | recv_timeout = conn->recv_timeout; |
1979 | if (!recv_timeout) | |
f6d5180c MC |
1980 | goto done; |
1981 | ||
4cf10435 | 1982 | recv_timeout *= HZ; |
f6d5180c | 1983 | last_recv = conn->last_recv; |
4c48a829 MC |
1984 | |
1985 | if (iscsi_has_ping_timed_out(conn)) { | |
322d739d | 1986 | iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs " |
4c48a829 MC |
1987 | "expired, recv timeout %d, last rx %lu, " |
1988 | "last ping %lu, now %lu\n", | |
1989 | conn->ping_timeout, conn->recv_timeout, | |
1990 | last_recv, conn->last_ping, jiffies); | |
f6d5180c MC |
1991 | spin_unlock(&session->lock); |
1992 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
1993 | return; | |
1994 | } | |
1995 | ||
4cf10435 | 1996 | if (time_before_eq(last_recv + recv_timeout, jiffies)) { |
c8611f97 | 1997 | /* send a ping to try to provoke some traffic */ |
1b2c7af8 | 1998 | ISCSI_DBG_CONN(conn, "Sending nopout as ping\n"); |
c8611f97 | 1999 | iscsi_send_nopout(conn, NULL); |
4cf10435 | 2000 | next_timeout = conn->last_ping + (conn->ping_timeout * HZ); |
ad294e9c | 2001 | } else |
4cf10435 | 2002 | next_timeout = last_recv + recv_timeout; |
f6d5180c | 2003 | |
1b2c7af8 | 2004 | ISCSI_DBG_CONN(conn, "Setting next tmo %lu\n", next_timeout); |
ad294e9c | 2005 | mod_timer(&conn->transport_timer, next_timeout); |
f6d5180c MC |
2006 | done: |
2007 | spin_unlock(&session->lock); | |
2008 | } | |
2009 | ||
9c19a7d0 | 2010 | static void iscsi_prep_abort_task_pdu(struct iscsi_task *task, |
843c0a8a MC |
2011 | struct iscsi_tm *hdr) |
2012 | { | |
2013 | memset(hdr, 0, sizeof(*hdr)); | |
2014 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
2015 | hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK; | |
2016 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
577577da MC |
2017 | memcpy(hdr->lun, task->lun, sizeof(hdr->lun)); |
2018 | hdr->rtt = task->hdr_itt; | |
2019 | hdr->refcmdsn = task->cmdsn; | |
843c0a8a MC |
2020 | } |
2021 | ||
7996a778 MC |
2022 | int iscsi_eh_abort(struct scsi_cmnd *sc) |
2023 | { | |
75613521 MC |
2024 | struct iscsi_cls_session *cls_session; |
2025 | struct iscsi_session *session; | |
f47f2cf5 | 2026 | struct iscsi_conn *conn; |
9c19a7d0 | 2027 | struct iscsi_task *task; |
843c0a8a MC |
2028 | struct iscsi_tm *hdr; |
2029 | int rc, age; | |
7996a778 | 2030 | |
75613521 MC |
2031 | cls_session = starget_to_session(scsi_target(sc->device)); |
2032 | session = cls_session->dd_data; | |
2033 | ||
bd2199d4 | 2034 | ISCSI_DBG_EH(session, "aborting sc %p\n", sc); |
4421c9eb | 2035 | |
6724add1 MC |
2036 | mutex_lock(&session->eh_mutex); |
2037 | spin_lock_bh(&session->lock); | |
f47f2cf5 MC |
2038 | /* |
2039 | * if session was ISCSI_STATE_IN_RECOVERY then we may not have | |
2040 | * got the command. | |
2041 | */ | |
2042 | if (!sc->SCp.ptr) { | |
bd2199d4 EZ |
2043 | ISCSI_DBG_EH(session, "sc never reached iscsi layer or " |
2044 | "it completed.\n"); | |
6724add1 MC |
2045 | spin_unlock_bh(&session->lock); |
2046 | mutex_unlock(&session->eh_mutex); | |
f47f2cf5 MC |
2047 | return SUCCESS; |
2048 | } | |
2049 | ||
7996a778 MC |
2050 | /* |
2051 | * If we are not logged in or we have started a new session | |
2052 | * then let the host reset code handle this | |
2053 | */ | |
843c0a8a MC |
2054 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN || |
2055 | sc->SCp.phase != session->age) { | |
2056 | spin_unlock_bh(&session->lock); | |
2057 | mutex_unlock(&session->eh_mutex); | |
bd2199d4 | 2058 | ISCSI_DBG_EH(session, "failing abort due to dropped " |
4421c9eb | 2059 | "session.\n"); |
843c0a8a MC |
2060 | return FAILED; |
2061 | } | |
2062 | ||
2063 | conn = session->leadconn; | |
2064 | conn->eh_abort_cnt++; | |
2065 | age = session->age; | |
2066 | ||
9c19a7d0 | 2067 | task = (struct iscsi_task *)sc->SCp.ptr; |
bd2199d4 EZ |
2068 | ISCSI_DBG_EH(session, "aborting [sc %p itt 0x%x]\n", |
2069 | sc, task->itt); | |
7996a778 | 2070 | |
9c19a7d0 MC |
2071 | /* task completed before time out */ |
2072 | if (!task->sc) { | |
bd2199d4 | 2073 | ISCSI_DBG_EH(session, "sc completed while abort in progress\n"); |
77a23c21 | 2074 | goto success; |
7ea8b828 | 2075 | } |
7996a778 | 2076 | |
9c19a7d0 | 2077 | if (task->state == ISCSI_TASK_PENDING) { |
b3cd5050 | 2078 | fail_scsi_task(task, DID_ABORT); |
77a23c21 MC |
2079 | goto success; |
2080 | } | |
7996a778 | 2081 | |
843c0a8a MC |
2082 | /* only have one tmf outstanding at a time */ |
2083 | if (conn->tmf_state != TMF_INITIAL) | |
7996a778 | 2084 | goto failed; |
843c0a8a | 2085 | conn->tmf_state = TMF_QUEUED; |
7996a778 | 2086 | |
843c0a8a | 2087 | hdr = &conn->tmhdr; |
9c19a7d0 | 2088 | iscsi_prep_abort_task_pdu(task, hdr); |
843c0a8a | 2089 | |
9c19a7d0 | 2090 | if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout)) { |
843c0a8a MC |
2091 | rc = FAILED; |
2092 | goto failed; | |
2093 | } | |
2094 | ||
2095 | switch (conn->tmf_state) { | |
2096 | case TMF_SUCCESS: | |
77a23c21 | 2097 | spin_unlock_bh(&session->lock); |
913e5bf4 MC |
2098 | /* |
2099 | * stop tx side incase the target had sent a abort rsp but | |
2100 | * the initiator was still writing out data. | |
2101 | */ | |
6724add1 | 2102 | iscsi_suspend_tx(conn); |
77a23c21 | 2103 | /* |
913e5bf4 MC |
2104 | * we do not stop the recv side because targets have been |
2105 | * good and have never sent us a successful tmf response | |
2106 | * then sent more data for the cmd. | |
77a23c21 | 2107 | */ |
6187c242 | 2108 | spin_lock_bh(&session->lock); |
b3cd5050 | 2109 | fail_scsi_task(task, DID_ABORT); |
843c0a8a | 2110 | conn->tmf_state = TMF_INITIAL; |
6187c242 | 2111 | spin_unlock_bh(&session->lock); |
6724add1 | 2112 | iscsi_start_tx(conn); |
77a23c21 | 2113 | goto success_unlocked; |
843c0a8a MC |
2114 | case TMF_TIMEDOUT: |
2115 | spin_unlock_bh(&session->lock); | |
2116 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
2117 | goto failed_unlocked; | |
2118 | case TMF_NOT_FOUND: | |
2119 | if (!sc->SCp.ptr) { | |
2120 | conn->tmf_state = TMF_INITIAL; | |
9c19a7d0 | 2121 | /* task completed before tmf abort response */ |
bd2199d4 EZ |
2122 | ISCSI_DBG_EH(session, "sc completed while abort in " |
2123 | "progress\n"); | |
77a23c21 | 2124 | goto success; |
7ea8b828 MC |
2125 | } |
2126 | /* fall through */ | |
2127 | default: | |
843c0a8a MC |
2128 | conn->tmf_state = TMF_INITIAL; |
2129 | goto failed; | |
7996a778 MC |
2130 | } |
2131 | ||
77a23c21 | 2132 | success: |
7996a778 | 2133 | spin_unlock_bh(&session->lock); |
77a23c21 | 2134 | success_unlocked: |
bd2199d4 EZ |
2135 | ISCSI_DBG_EH(session, "abort success [sc %p itt 0x%x]\n", |
2136 | sc, task->itt); | |
6724add1 | 2137 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
2138 | return SUCCESS; |
2139 | ||
2140 | failed: | |
2141 | spin_unlock_bh(&session->lock); | |
77a23c21 | 2142 | failed_unlocked: |
bd2199d4 EZ |
2143 | ISCSI_DBG_EH(session, "abort failed [sc %p itt 0x%x]\n", sc, |
2144 | task ? task->itt : 0); | |
6724add1 | 2145 | mutex_unlock(&session->eh_mutex); |
7996a778 MC |
2146 | return FAILED; |
2147 | } | |
2148 | EXPORT_SYMBOL_GPL(iscsi_eh_abort); | |
2149 | ||
843c0a8a MC |
2150 | static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr) |
2151 | { | |
2152 | memset(hdr, 0, sizeof(*hdr)); | |
2153 | hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; | |
2154 | hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK; | |
2155 | hdr->flags |= ISCSI_FLAG_CMD_FINAL; | |
2156 | int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun); | |
f6d5180c | 2157 | hdr->rtt = RESERVED_ITT; |
843c0a8a MC |
2158 | } |
2159 | ||
2160 | int iscsi_eh_device_reset(struct scsi_cmnd *sc) | |
2161 | { | |
75613521 MC |
2162 | struct iscsi_cls_session *cls_session; |
2163 | struct iscsi_session *session; | |
843c0a8a MC |
2164 | struct iscsi_conn *conn; |
2165 | struct iscsi_tm *hdr; | |
2166 | int rc = FAILED; | |
2167 | ||
75613521 MC |
2168 | cls_session = starget_to_session(scsi_target(sc->device)); |
2169 | session = cls_session->dd_data; | |
2170 | ||
bd2199d4 | 2171 | ISCSI_DBG_EH(session, "LU Reset [sc %p lun %u]\n", sc, sc->device->lun); |
843c0a8a MC |
2172 | |
2173 | mutex_lock(&session->eh_mutex); | |
2174 | spin_lock_bh(&session->lock); | |
2175 | /* | |
2176 | * Just check if we are not logged in. We cannot check for | |
2177 | * the phase because the reset could come from a ioctl. | |
2178 | */ | |
2179 | if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN) | |
2180 | goto unlock; | |
2181 | conn = session->leadconn; | |
2182 | ||
2183 | /* only have one tmf outstanding at a time */ | |
2184 | if (conn->tmf_state != TMF_INITIAL) | |
2185 | goto unlock; | |
2186 | conn->tmf_state = TMF_QUEUED; | |
2187 | ||
2188 | hdr = &conn->tmhdr; | |
2189 | iscsi_prep_lun_reset_pdu(sc, hdr); | |
2190 | ||
9c19a7d0 | 2191 | if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age, |
f6d5180c | 2192 | session->lu_reset_timeout)) { |
843c0a8a MC |
2193 | rc = FAILED; |
2194 | goto unlock; | |
2195 | } | |
2196 | ||
2197 | switch (conn->tmf_state) { | |
2198 | case TMF_SUCCESS: | |
2199 | break; | |
2200 | case TMF_TIMEDOUT: | |
2201 | spin_unlock_bh(&session->lock); | |
2202 | iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); | |
2203 | goto done; | |
2204 | default: | |
2205 | conn->tmf_state = TMF_INITIAL; | |
2206 | goto unlock; | |
2207 | } | |
2208 | ||
2209 | rc = SUCCESS; | |
2210 | spin_unlock_bh(&session->lock); | |
2211 | ||
2212 | iscsi_suspend_tx(conn); | |
913e5bf4 | 2213 | |
a3439148 | 2214 | spin_lock_bh(&session->lock); |
3bbaaad9 | 2215 | fail_scsi_tasks(conn, sc->device->lun, DID_ERROR); |
843c0a8a | 2216 | conn->tmf_state = TMF_INITIAL; |
a3439148 | 2217 | spin_unlock_bh(&session->lock); |
843c0a8a MC |
2218 | |
2219 | iscsi_start_tx(conn); | |
2220 | goto done; | |
2221 | ||
2222 | unlock: | |
2223 | spin_unlock_bh(&session->lock); | |
2224 | done: | |
bd2199d4 EZ |
2225 | ISCSI_DBG_EH(session, "dev reset result = %s\n", |
2226 | rc == SUCCESS ? "SUCCESS" : "FAILED"); | |
843c0a8a MC |
2227 | mutex_unlock(&session->eh_mutex); |
2228 | return rc; | |
2229 | } | |
2230 | EXPORT_SYMBOL_GPL(iscsi_eh_device_reset); | |
2231 | ||
6320377f OK |
2232 | /* |
2233 | * Pre-allocate a pool of @max items of @item_size. By default, the pool | |
2234 | * should be accessed via kfifo_{get,put} on q->queue. | |
2235 | * Optionally, the caller can obtain the array of object pointers | |
2236 | * by passing in a non-NULL @items pointer | |
2237 | */ | |
7996a778 | 2238 | int |
6320377f | 2239 | iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size) |
7996a778 | 2240 | { |
6320377f | 2241 | int i, num_arrays = 1; |
7996a778 | 2242 | |
6320377f | 2243 | memset(q, 0, sizeof(*q)); |
7996a778 MC |
2244 | |
2245 | q->max = max; | |
6320377f OK |
2246 | |
2247 | /* If the user passed an items pointer, he wants a copy of | |
2248 | * the array. */ | |
2249 | if (items) | |
2250 | num_arrays++; | |
2251 | q->pool = kzalloc(num_arrays * max * sizeof(void*), GFP_KERNEL); | |
2252 | if (q->pool == NULL) | |
f474a37b | 2253 | return -ENOMEM; |
7996a778 MC |
2254 | |
2255 | q->queue = kfifo_init((void*)q->pool, max * sizeof(void*), | |
2256 | GFP_KERNEL, NULL); | |
fd6e1c14 JD |
2257 | if (IS_ERR(q->queue)) { |
2258 | q->queue = NULL; | |
6320377f | 2259 | goto enomem; |
fd6e1c14 | 2260 | } |
7996a778 MC |
2261 | |
2262 | for (i = 0; i < max; i++) { | |
6320377f | 2263 | q->pool[i] = kzalloc(item_size, GFP_KERNEL); |
7996a778 | 2264 | if (q->pool[i] == NULL) { |
6320377f OK |
2265 | q->max = i; |
2266 | goto enomem; | |
7996a778 | 2267 | } |
7996a778 MC |
2268 | __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*)); |
2269 | } | |
6320377f OK |
2270 | |
2271 | if (items) { | |
2272 | *items = q->pool + max; | |
2273 | memcpy(*items, q->pool, max * sizeof(void *)); | |
2274 | } | |
2275 | ||
7996a778 | 2276 | return 0; |
6320377f OK |
2277 | |
2278 | enomem: | |
2279 | iscsi_pool_free(q); | |
2280 | return -ENOMEM; | |
7996a778 MC |
2281 | } |
2282 | EXPORT_SYMBOL_GPL(iscsi_pool_init); | |
2283 | ||
6320377f | 2284 | void iscsi_pool_free(struct iscsi_pool *q) |
7996a778 MC |
2285 | { |
2286 | int i; | |
2287 | ||
2288 | for (i = 0; i < q->max; i++) | |
6320377f | 2289 | kfree(q->pool[i]); |
f474a37b | 2290 | kfree(q->pool); |
2f5899a3 | 2291 | kfree(q->queue); |
7996a778 MC |
2292 | } |
2293 | EXPORT_SYMBOL_GPL(iscsi_pool_free); | |
2294 | ||
a4804cd6 MC |
2295 | /** |
2296 | * iscsi_host_add - add host to system | |
2297 | * @shost: scsi host | |
2298 | * @pdev: parent device | |
2299 | * | |
2300 | * This should be called by partial offload and software iscsi drivers | |
2301 | * to add a host to the system. | |
2302 | */ | |
2303 | int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev) | |
2304 | { | |
8e9a20ce MC |
2305 | if (!shost->can_queue) |
2306 | shost->can_queue = ISCSI_DEF_XMIT_CMDS_MAX; | |
2307 | ||
4d108350 MC |
2308 | if (!shost->cmd_per_lun) |
2309 | shost->cmd_per_lun = ISCSI_DEF_CMD_PER_LUN; | |
2310 | ||
308cec14 MC |
2311 | if (!shost->transportt->eh_timed_out) |
2312 | shost->transportt->eh_timed_out = iscsi_eh_cmd_timed_out; | |
a4804cd6 MC |
2313 | return scsi_add_host(shost, pdev); |
2314 | } | |
2315 | EXPORT_SYMBOL_GPL(iscsi_host_add); | |
2316 | ||
2317 | /** | |
2318 | * iscsi_host_alloc - allocate a host and driver data | |
2319 | * @sht: scsi host template | |
2320 | * @dd_data_size: driver host data size | |
32ae763e | 2321 | * @xmit_can_sleep: bool indicating if LLD will queue IO from a work queue |
a4804cd6 MC |
2322 | * |
2323 | * This should be called by partial offload and software iscsi drivers. | |
2324 | * To access the driver specific memory use the iscsi_host_priv() macro. | |
2325 | */ | |
2326 | struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht, | |
4d108350 | 2327 | int dd_data_size, bool xmit_can_sleep) |
75613521 | 2328 | { |
a4804cd6 | 2329 | struct Scsi_Host *shost; |
e5bd7b54 | 2330 | struct iscsi_host *ihost; |
a4804cd6 MC |
2331 | |
2332 | shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size); | |
2333 | if (!shost) | |
2334 | return NULL; | |
e5bd7b54 | 2335 | ihost = shost_priv(shost); |
32ae763e MC |
2336 | |
2337 | if (xmit_can_sleep) { | |
2338 | snprintf(ihost->workq_name, sizeof(ihost->workq_name), | |
2339 | "iscsi_q_%d", shost->host_no); | |
2340 | ihost->workq = create_singlethread_workqueue(ihost->workq_name); | |
2341 | if (!ihost->workq) | |
2342 | goto free_host; | |
2343 | } | |
2344 | ||
e5bd7b54 MC |
2345 | spin_lock_init(&ihost->lock); |
2346 | ihost->state = ISCSI_HOST_SETUP; | |
2347 | ihost->num_sessions = 0; | |
2348 | init_waitqueue_head(&ihost->session_removal_wq); | |
a4804cd6 | 2349 | return shost; |
32ae763e MC |
2350 | |
2351 | free_host: | |
2352 | scsi_host_put(shost); | |
2353 | return NULL; | |
a4804cd6 MC |
2354 | } |
2355 | EXPORT_SYMBOL_GPL(iscsi_host_alloc); | |
2356 | ||
e5bd7b54 MC |
2357 | static void iscsi_notify_host_removed(struct iscsi_cls_session *cls_session) |
2358 | { | |
40a06e75 | 2359 | iscsi_session_failure(cls_session->dd_data, ISCSI_ERR_INVALID_HOST); |
e5bd7b54 MC |
2360 | } |
2361 | ||
a4804cd6 MC |
2362 | /** |
2363 | * iscsi_host_remove - remove host and sessions | |
2364 | * @shost: scsi host | |
2365 | * | |
e5bd7b54 MC |
2366 | * If there are any sessions left, this will initiate the removal and wait |
2367 | * for the completion. | |
a4804cd6 MC |
2368 | */ |
2369 | void iscsi_host_remove(struct Scsi_Host *shost) | |
2370 | { | |
e5bd7b54 MC |
2371 | struct iscsi_host *ihost = shost_priv(shost); |
2372 | unsigned long flags; | |
2373 | ||
2374 | spin_lock_irqsave(&ihost->lock, flags); | |
2375 | ihost->state = ISCSI_HOST_REMOVED; | |
2376 | spin_unlock_irqrestore(&ihost->lock, flags); | |
2377 | ||
2378 | iscsi_host_for_each_session(shost, iscsi_notify_host_removed); | |
2379 | wait_event_interruptible(ihost->session_removal_wq, | |
2380 | ihost->num_sessions == 0); | |
2381 | if (signal_pending(current)) | |
2382 | flush_signals(current); | |
2383 | ||
a4804cd6 | 2384 | scsi_remove_host(shost); |
32ae763e MC |
2385 | if (ihost->workq) |
2386 | destroy_workqueue(ihost->workq); | |
75613521 | 2387 | } |
a4804cd6 | 2388 | EXPORT_SYMBOL_GPL(iscsi_host_remove); |
7996a778 | 2389 | |
a4804cd6 | 2390 | void iscsi_host_free(struct Scsi_Host *shost) |
75613521 MC |
2391 | { |
2392 | struct iscsi_host *ihost = shost_priv(shost); | |
7996a778 | 2393 | |
75613521 MC |
2394 | kfree(ihost->netdev); |
2395 | kfree(ihost->hwaddress); | |
2396 | kfree(ihost->initiatorname); | |
a4804cd6 | 2397 | scsi_host_put(shost); |
75613521 | 2398 | } |
a4804cd6 | 2399 | EXPORT_SYMBOL_GPL(iscsi_host_free); |
7996a778 | 2400 | |
e5bd7b54 MC |
2401 | static void iscsi_host_dec_session_cnt(struct Scsi_Host *shost) |
2402 | { | |
2403 | struct iscsi_host *ihost = shost_priv(shost); | |
2404 | unsigned long flags; | |
2405 | ||
2406 | shost = scsi_host_get(shost); | |
2407 | if (!shost) { | |
2408 | printk(KERN_ERR "Invalid state. Cannot notify host removal " | |
2409 | "of session teardown event because host already " | |
2410 | "removed.\n"); | |
2411 | return; | |
2412 | } | |
2413 | ||
2414 | spin_lock_irqsave(&ihost->lock, flags); | |
2415 | ihost->num_sessions--; | |
2416 | if (ihost->num_sessions == 0) | |
2417 | wake_up(&ihost->session_removal_wq); | |
2418 | spin_unlock_irqrestore(&ihost->lock, flags); | |
2419 | scsi_host_put(shost); | |
2420 | } | |
2421 | ||
7996a778 MC |
2422 | /** |
2423 | * iscsi_session_setup - create iscsi cls session and host and session | |
7996a778 | 2424 | * @iscsit: iscsi transport template |
75613521 MC |
2425 | * @shost: scsi host |
2426 | * @cmds_max: session can queue | |
9c19a7d0 | 2427 | * @cmd_task_size: LLD task private data size |
7996a778 | 2428 | * @initial_cmdsn: initial CmdSN |
7996a778 MC |
2429 | * |
2430 | * This can be used by software iscsi_transports that allocate | |
2431 | * a session per scsi host. | |
3cf7b233 MC |
2432 | * |
2433 | * Callers should set cmds_max to the largest total numer (mgmt + scsi) of | |
2434 | * tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks | |
2435 | * for nop handling and login/logout requests. | |
75613521 | 2436 | */ |
7996a778 | 2437 | struct iscsi_cls_session * |
75613521 | 2438 | iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost, |
3cf7b233 | 2439 | uint16_t cmds_max, int cmd_task_size, |
7970634b | 2440 | uint32_t initial_cmdsn, unsigned int id) |
7996a778 | 2441 | { |
e5bd7b54 | 2442 | struct iscsi_host *ihost = shost_priv(shost); |
7996a778 MC |
2443 | struct iscsi_session *session; |
2444 | struct iscsi_cls_session *cls_session; | |
3cf7b233 | 2445 | int cmd_i, scsi_cmds, total_cmds = cmds_max; |
e5bd7b54 MC |
2446 | unsigned long flags; |
2447 | ||
2448 | spin_lock_irqsave(&ihost->lock, flags); | |
2449 | if (ihost->state == ISCSI_HOST_REMOVED) { | |
2450 | spin_unlock_irqrestore(&ihost->lock, flags); | |
2451 | return NULL; | |
2452 | } | |
2453 | ihost->num_sessions++; | |
2454 | spin_unlock_irqrestore(&ihost->lock, flags); | |
8e9a20ce MC |
2455 | |
2456 | if (!total_cmds) | |
2457 | total_cmds = ISCSI_DEF_XMIT_CMDS_MAX; | |
3e5c28ad | 2458 | /* |
3cf7b233 MC |
2459 | * The iscsi layer needs some tasks for nop handling and tmfs, |
2460 | * so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX | |
2461 | * + 1 command for scsi IO. | |
3e5c28ad | 2462 | */ |
3cf7b233 MC |
2463 | if (total_cmds < ISCSI_TOTAL_CMDS_MIN) { |
2464 | printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " | |
2465 | "must be a power of two that is at least %d.\n", | |
2466 | total_cmds, ISCSI_TOTAL_CMDS_MIN); | |
e5bd7b54 | 2467 | goto dec_session_count; |
3cf7b233 MC |
2468 | } |
2469 | ||
2470 | if (total_cmds > ISCSI_TOTAL_CMDS_MAX) { | |
2471 | printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " | |
2472 | "must be a power of 2 less than or equal to %d.\n", | |
2473 | cmds_max, ISCSI_TOTAL_CMDS_MAX); | |
2474 | total_cmds = ISCSI_TOTAL_CMDS_MAX; | |
2475 | } | |
2476 | ||
2477 | if (!is_power_of_2(total_cmds)) { | |
2478 | printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " | |
2479 | "must be a power of 2.\n", total_cmds); | |
2480 | total_cmds = rounddown_pow_of_two(total_cmds); | |
2481 | if (total_cmds < ISCSI_TOTAL_CMDS_MIN) | |
2482 | return NULL; | |
2483 | printk(KERN_INFO "iscsi: Rounding can_queue to %d.\n", | |
2484 | total_cmds); | |
1548271e | 2485 | } |
3cf7b233 | 2486 | scsi_cmds = total_cmds - ISCSI_MGMT_CMDS_MAX; |
1548271e | 2487 | |
5d91e209 MC |
2488 | cls_session = iscsi_alloc_session(shost, iscsit, |
2489 | sizeof(struct iscsi_session)); | |
75613521 | 2490 | if (!cls_session) |
e5bd7b54 | 2491 | goto dec_session_count; |
75613521 MC |
2492 | session = cls_session->dd_data; |
2493 | session->cls_session = cls_session; | |
7996a778 MC |
2494 | session->host = shost; |
2495 | session->state = ISCSI_STATE_FREE; | |
f6d5180c | 2496 | session->fast_abort = 1; |
4cd49ea1 MC |
2497 | session->lu_reset_timeout = 15; |
2498 | session->abort_timeout = 10; | |
3cf7b233 MC |
2499 | session->scsi_cmds_max = scsi_cmds; |
2500 | session->cmds_max = total_cmds; | |
e0726407 | 2501 | session->queued_cmdsn = session->cmdsn = initial_cmdsn; |
7996a778 MC |
2502 | session->exp_cmdsn = initial_cmdsn + 1; |
2503 | session->max_cmdsn = initial_cmdsn + 1; | |
2504 | session->max_r2t = 1; | |
2505 | session->tt = iscsit; | |
6724add1 | 2506 | mutex_init(&session->eh_mutex); |
75613521 | 2507 | spin_lock_init(&session->lock); |
7996a778 MC |
2508 | |
2509 | /* initialize SCSI PDU commands pool */ | |
2510 | if (iscsi_pool_init(&session->cmdpool, session->cmds_max, | |
2511 | (void***)&session->cmds, | |
9c19a7d0 | 2512 | cmd_task_size + sizeof(struct iscsi_task))) |
7996a778 MC |
2513 | goto cmdpool_alloc_fail; |
2514 | ||
2515 | /* pre-format cmds pool with ITT */ | |
2516 | for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { | |
9c19a7d0 | 2517 | struct iscsi_task *task = session->cmds[cmd_i]; |
7996a778 | 2518 | |
9c19a7d0 MC |
2519 | if (cmd_task_size) |
2520 | task->dd_data = &task[1]; | |
2521 | task->itt = cmd_i; | |
3bbaaad9 | 2522 | task->state = ISCSI_TASK_FREE; |
9c19a7d0 | 2523 | INIT_LIST_HEAD(&task->running); |
7996a778 MC |
2524 | } |
2525 | ||
f53a88da | 2526 | if (!try_module_get(iscsit->owner)) |
75613521 | 2527 | goto module_get_fail; |
7996a778 | 2528 | |
7970634b | 2529 | if (iscsi_add_session(cls_session, id)) |
75613521 | 2530 | goto cls_session_fail; |
e5bd7b54 | 2531 | |
7996a778 MC |
2532 | return cls_session; |
2533 | ||
2534 | cls_session_fail: | |
75613521 MC |
2535 | module_put(iscsit->owner); |
2536 | module_get_fail: | |
6320377f | 2537 | iscsi_pool_free(&session->cmdpool); |
7996a778 | 2538 | cmdpool_alloc_fail: |
75613521 | 2539 | iscsi_free_session(cls_session); |
e5bd7b54 MC |
2540 | dec_session_count: |
2541 | iscsi_host_dec_session_cnt(shost); | |
7996a778 MC |
2542 | return NULL; |
2543 | } | |
2544 | EXPORT_SYMBOL_GPL(iscsi_session_setup); | |
2545 | ||
2546 | /** | |
2547 | * iscsi_session_teardown - destroy session, host, and cls_session | |
75613521 | 2548 | * @cls_session: iscsi session |
7996a778 | 2549 | * |
75613521 MC |
2550 | * The driver must have called iscsi_remove_session before |
2551 | * calling this. | |
2552 | */ | |
7996a778 MC |
2553 | void iscsi_session_teardown(struct iscsi_cls_session *cls_session) |
2554 | { | |
75613521 | 2555 | struct iscsi_session *session = cls_session->dd_data; |
63f75cc8 | 2556 | struct module *owner = cls_session->transport->owner; |
e5bd7b54 | 2557 | struct Scsi_Host *shost = session->host; |
7996a778 | 2558 | |
6320377f | 2559 | iscsi_pool_free(&session->cmdpool); |
7996a778 | 2560 | |
b2c64167 MC |
2561 | kfree(session->password); |
2562 | kfree(session->password_in); | |
2563 | kfree(session->username); | |
2564 | kfree(session->username_in); | |
f3ff0c36 | 2565 | kfree(session->targetname); |
88dfd340 MC |
2566 | kfree(session->initiatorname); |
2567 | kfree(session->ifacename); | |
f3ff0c36 | 2568 | |
75613521 | 2569 | iscsi_destroy_session(cls_session); |
e5bd7b54 | 2570 | iscsi_host_dec_session_cnt(shost); |
63f75cc8 | 2571 | module_put(owner); |
7996a778 MC |
2572 | } |
2573 | EXPORT_SYMBOL_GPL(iscsi_session_teardown); | |
2574 | ||
2575 | /** | |
2576 | * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn | |
2577 | * @cls_session: iscsi_cls_session | |
5d91e209 | 2578 | * @dd_size: private driver data size |
7996a778 | 2579 | * @conn_idx: cid |
5d91e209 | 2580 | */ |
7996a778 | 2581 | struct iscsi_cls_conn * |
5d91e209 MC |
2582 | iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size, |
2583 | uint32_t conn_idx) | |
7996a778 | 2584 | { |
75613521 | 2585 | struct iscsi_session *session = cls_session->dd_data; |
7996a778 MC |
2586 | struct iscsi_conn *conn; |
2587 | struct iscsi_cls_conn *cls_conn; | |
d36ab6f3 | 2588 | char *data; |
7996a778 | 2589 | |
5d91e209 MC |
2590 | cls_conn = iscsi_create_conn(cls_session, sizeof(*conn) + dd_size, |
2591 | conn_idx); | |
7996a778 MC |
2592 | if (!cls_conn) |
2593 | return NULL; | |
2594 | conn = cls_conn->dd_data; | |
5d91e209 | 2595 | memset(conn, 0, sizeof(*conn) + dd_size); |
7996a778 | 2596 | |
5d91e209 | 2597 | conn->dd_data = cls_conn->dd_data + sizeof(*conn); |
7996a778 MC |
2598 | conn->session = session; |
2599 | conn->cls_conn = cls_conn; | |
2600 | conn->c_stage = ISCSI_CONN_INITIAL_STAGE; | |
2601 | conn->id = conn_idx; | |
2602 | conn->exp_statsn = 0; | |
843c0a8a | 2603 | conn->tmf_state = TMF_INITIAL; |
f6d5180c MC |
2604 | |
2605 | init_timer(&conn->transport_timer); | |
2606 | conn->transport_timer.data = (unsigned long)conn; | |
2607 | conn->transport_timer.function = iscsi_check_transport_timeouts; | |
2608 | ||
843c0a8a | 2609 | INIT_LIST_HEAD(&conn->mgmtqueue); |
3bbaaad9 | 2610 | INIT_LIST_HEAD(&conn->cmdqueue); |
843c0a8a | 2611 | INIT_LIST_HEAD(&conn->requeue); |
c4028958 | 2612 | INIT_WORK(&conn->xmitwork, iscsi_xmitworker); |
7996a778 | 2613 | |
9c19a7d0 | 2614 | /* allocate login_task used for the login/text sequences */ |
7996a778 | 2615 | spin_lock_bh(&session->lock); |
3e5c28ad | 2616 | if (!__kfifo_get(session->cmdpool.queue, |
9c19a7d0 | 2617 | (void*)&conn->login_task, |
7996a778 MC |
2618 | sizeof(void*))) { |
2619 | spin_unlock_bh(&session->lock); | |
9c19a7d0 | 2620 | goto login_task_alloc_fail; |
7996a778 MC |
2621 | } |
2622 | spin_unlock_bh(&session->lock); | |
2623 | ||
cfeb2cf9 MC |
2624 | data = (char *) __get_free_pages(GFP_KERNEL, |
2625 | get_order(ISCSI_DEF_MAX_RECV_SEG_LEN)); | |
d36ab6f3 | 2626 | if (!data) |
9c19a7d0 MC |
2627 | goto login_task_data_alloc_fail; |
2628 | conn->login_task->data = conn->data = data; | |
d36ab6f3 | 2629 | |
843c0a8a | 2630 | init_timer(&conn->tmf_timer); |
7996a778 MC |
2631 | init_waitqueue_head(&conn->ehwait); |
2632 | ||
2633 | return cls_conn; | |
2634 | ||
9c19a7d0 MC |
2635 | login_task_data_alloc_fail: |
2636 | __kfifo_put(session->cmdpool.queue, (void*)&conn->login_task, | |
d36ab6f3 | 2637 | sizeof(void*)); |
9c19a7d0 | 2638 | login_task_alloc_fail: |
7996a778 MC |
2639 | iscsi_destroy_conn(cls_conn); |
2640 | return NULL; | |
2641 | } | |
2642 | EXPORT_SYMBOL_GPL(iscsi_conn_setup); | |
2643 | ||
2644 | /** | |
2645 | * iscsi_conn_teardown - teardown iscsi connection | |
2646 | * cls_conn: iscsi class connection | |
2647 | * | |
2648 | * TODO: we may need to make this into a two step process | |
2649 | * like scsi-mls remove + put host | |
2650 | */ | |
2651 | void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn) | |
2652 | { | |
2653 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2654 | struct iscsi_session *session = conn->session; | |
2655 | unsigned long flags; | |
2656 | ||
f6d5180c MC |
2657 | del_timer_sync(&conn->transport_timer); |
2658 | ||
7996a778 MC |
2659 | spin_lock_bh(&session->lock); |
2660 | conn->c_stage = ISCSI_CONN_CLEANUP_WAIT; | |
2661 | if (session->leadconn == conn) { | |
2662 | /* | |
2663 | * leading connection? then give up on recovery. | |
2664 | */ | |
2665 | session->state = ISCSI_STATE_TERMINATE; | |
2666 | wake_up(&conn->ehwait); | |
2667 | } | |
2668 | spin_unlock_bh(&session->lock); | |
2669 | ||
7996a778 MC |
2670 | /* |
2671 | * Block until all in-progress commands for this connection | |
2672 | * time out or fail. | |
2673 | */ | |
2674 | for (;;) { | |
2675 | spin_lock_irqsave(session->host->host_lock, flags); | |
2676 | if (!session->host->host_busy) { /* OK for ERL == 0 */ | |
2677 | spin_unlock_irqrestore(session->host->host_lock, flags); | |
2678 | break; | |
2679 | } | |
2680 | spin_unlock_irqrestore(session->host->host_lock, flags); | |
2681 | msleep_interruptible(500); | |
322d739d MC |
2682 | iscsi_conn_printk(KERN_INFO, conn, "iscsi conn_destroy(): " |
2683 | "host_busy %d host_failed %d\n", | |
2684 | session->host->host_busy, | |
2685 | session->host->host_failed); | |
7996a778 MC |
2686 | /* |
2687 | * force eh_abort() to unblock | |
2688 | */ | |
2689 | wake_up(&conn->ehwait); | |
2690 | } | |
2691 | ||
779ea120 | 2692 | /* flush queued up work because we free the connection below */ |
843c0a8a | 2693 | iscsi_suspend_tx(conn); |
779ea120 | 2694 | |
7996a778 | 2695 | spin_lock_bh(&session->lock); |
cfeb2cf9 MC |
2696 | free_pages((unsigned long) conn->data, |
2697 | get_order(ISCSI_DEF_MAX_RECV_SEG_LEN)); | |
f3ff0c36 | 2698 | kfree(conn->persistent_address); |
9c19a7d0 | 2699 | __kfifo_put(session->cmdpool.queue, (void*)&conn->login_task, |
7996a778 | 2700 | sizeof(void*)); |
e0726407 | 2701 | if (session->leadconn == conn) |
7996a778 | 2702 | session->leadconn = NULL; |
7996a778 MC |
2703 | spin_unlock_bh(&session->lock); |
2704 | ||
7996a778 MC |
2705 | iscsi_destroy_conn(cls_conn); |
2706 | } | |
2707 | EXPORT_SYMBOL_GPL(iscsi_conn_teardown); | |
2708 | ||
2709 | int iscsi_conn_start(struct iscsi_cls_conn *cls_conn) | |
2710 | { | |
2711 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2712 | struct iscsi_session *session = conn->session; | |
2713 | ||
ffd0436e | 2714 | if (!session) { |
322d739d MC |
2715 | iscsi_conn_printk(KERN_ERR, conn, |
2716 | "can't start unbound connection\n"); | |
7996a778 MC |
2717 | return -EPERM; |
2718 | } | |
2719 | ||
db98ccde MC |
2720 | if ((session->imm_data_en || !session->initial_r2t_en) && |
2721 | session->first_burst > session->max_burst) { | |
322d739d MC |
2722 | iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: " |
2723 | "first_burst %d max_burst %d\n", | |
2724 | session->first_burst, session->max_burst); | |
ffd0436e MC |
2725 | return -EINVAL; |
2726 | } | |
2727 | ||
f6d5180c | 2728 | if (conn->ping_timeout && !conn->recv_timeout) { |
322d739d MC |
2729 | iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of " |
2730 | "zero. Using 5 seconds\n."); | |
f6d5180c MC |
2731 | conn->recv_timeout = 5; |
2732 | } | |
2733 | ||
2734 | if (conn->recv_timeout && !conn->ping_timeout) { | |
322d739d MC |
2735 | iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of " |
2736 | "zero. Using 5 seconds.\n"); | |
f6d5180c MC |
2737 | conn->ping_timeout = 5; |
2738 | } | |
2739 | ||
7996a778 MC |
2740 | spin_lock_bh(&session->lock); |
2741 | conn->c_stage = ISCSI_CONN_STARTED; | |
2742 | session->state = ISCSI_STATE_LOGGED_IN; | |
e0726407 | 2743 | session->queued_cmdsn = session->cmdsn; |
7996a778 | 2744 | |
f6d5180c MC |
2745 | conn->last_recv = jiffies; |
2746 | conn->last_ping = jiffies; | |
2747 | if (conn->recv_timeout && conn->ping_timeout) | |
2748 | mod_timer(&conn->transport_timer, | |
2749 | jiffies + (conn->recv_timeout * HZ)); | |
2750 | ||
7996a778 MC |
2751 | switch(conn->stop_stage) { |
2752 | case STOP_CONN_RECOVER: | |
2753 | /* | |
2754 | * unblock eh_abort() if it is blocked. re-try all | |
2755 | * commands after successful recovery | |
2756 | */ | |
7996a778 | 2757 | conn->stop_stage = 0; |
843c0a8a | 2758 | conn->tmf_state = TMF_INITIAL; |
7996a778 | 2759 | session->age++; |
8b1d0343 MC |
2760 | if (session->age == 16) |
2761 | session->age = 0; | |
6eabafbe | 2762 | break; |
7996a778 | 2763 | case STOP_CONN_TERM: |
7996a778 | 2764 | conn->stop_stage = 0; |
7996a778 MC |
2765 | break; |
2766 | default: | |
2767 | break; | |
2768 | } | |
2769 | spin_unlock_bh(&session->lock); | |
2770 | ||
75613521 | 2771 | iscsi_unblock_session(session->cls_session); |
6eabafbe | 2772 | wake_up(&conn->ehwait); |
7996a778 MC |
2773 | return 0; |
2774 | } | |
2775 | EXPORT_SYMBOL_GPL(iscsi_conn_start); | |
2776 | ||
2777 | static void | |
3bbaaad9 | 2778 | fail_mgmt_tasks(struct iscsi_session *session, struct iscsi_conn *conn) |
7996a778 | 2779 | { |
3bbaaad9 | 2780 | struct iscsi_task *task; |
b3cd5050 | 2781 | int i, state; |
7996a778 | 2782 | |
3bbaaad9 MC |
2783 | for (i = 0; i < conn->session->cmds_max; i++) { |
2784 | task = conn->session->cmds[i]; | |
2785 | if (task->sc) | |
2786 | continue; | |
7996a778 | 2787 | |
3bbaaad9 MC |
2788 | if (task->state == ISCSI_TASK_FREE) |
2789 | continue; | |
7996a778 | 2790 | |
3bbaaad9 MC |
2791 | ISCSI_DBG_SESSION(conn->session, |
2792 | "failing mgmt itt 0x%x state %d\n", | |
2793 | task->itt, task->state); | |
b3cd5050 MC |
2794 | state = ISCSI_TASK_ABRT_SESS_RECOV; |
2795 | if (task->state == ISCSI_TASK_PENDING) | |
2796 | state = ISCSI_TASK_COMPLETED; | |
2797 | iscsi_complete_task(task, state); | |
2798 | ||
3bbaaad9 | 2799 | } |
7996a778 MC |
2800 | } |
2801 | ||
656cffc9 MC |
2802 | static void iscsi_start_session_recovery(struct iscsi_session *session, |
2803 | struct iscsi_conn *conn, int flag) | |
7996a778 | 2804 | { |
ed2abc7f MC |
2805 | int old_stop_stage; |
2806 | ||
6724add1 | 2807 | mutex_lock(&session->eh_mutex); |
7996a778 | 2808 | spin_lock_bh(&session->lock); |
ed2abc7f | 2809 | if (conn->stop_stage == STOP_CONN_TERM) { |
7996a778 | 2810 | spin_unlock_bh(&session->lock); |
6724add1 MC |
2811 | mutex_unlock(&session->eh_mutex); |
2812 | return; | |
2813 | } | |
2814 | ||
ed2abc7f MC |
2815 | /* |
2816 | * When this is called for the in_login state, we only want to clean | |
9c19a7d0 | 2817 | * up the login task and connection. We do not need to block and set |
67a61114 | 2818 | * the recovery state again |
ed2abc7f | 2819 | */ |
67a61114 MC |
2820 | if (flag == STOP_CONN_TERM) |
2821 | session->state = ISCSI_STATE_TERMINATE; | |
2822 | else if (conn->stop_stage != STOP_CONN_RECOVER) | |
2823 | session->state = ISCSI_STATE_IN_RECOVERY; | |
26013ad4 | 2824 | spin_unlock_bh(&session->lock); |
ed2abc7f | 2825 | |
26013ad4 MC |
2826 | del_timer_sync(&conn->transport_timer); |
2827 | iscsi_suspend_tx(conn); | |
2828 | ||
2829 | spin_lock_bh(&session->lock); | |
ed2abc7f | 2830 | old_stop_stage = conn->stop_stage; |
7996a778 | 2831 | conn->stop_stage = flag; |
67a61114 | 2832 | conn->c_stage = ISCSI_CONN_STOPPED; |
7996a778 | 2833 | spin_unlock_bh(&session->lock); |
6724add1 | 2834 | |
7996a778 MC |
2835 | /* |
2836 | * for connection level recovery we should not calculate | |
2837 | * header digest. conn->hdr_size used for optimization | |
2838 | * in hdr_extract() and will be re-negotiated at | |
2839 | * set_param() time. | |
2840 | */ | |
2841 | if (flag == STOP_CONN_RECOVER) { | |
2842 | conn->hdrdgst_en = 0; | |
2843 | conn->datadgst_en = 0; | |
656cffc9 | 2844 | if (session->state == ISCSI_STATE_IN_RECOVERY && |
67a61114 | 2845 | old_stop_stage != STOP_CONN_RECOVER) { |
1b2c7af8 | 2846 | ISCSI_DBG_SESSION(session, "blocking session\n"); |
75613521 | 2847 | iscsi_block_session(session->cls_session); |
67a61114 | 2848 | } |
7996a778 | 2849 | } |
656cffc9 | 2850 | |
656cffc9 MC |
2851 | /* |
2852 | * flush queues. | |
2853 | */ | |
2854 | spin_lock_bh(&session->lock); | |
b3cd5050 | 2855 | fail_scsi_tasks(conn, -1, DID_TRANSPORT_DISRUPTED); |
3bbaaad9 | 2856 | fail_mgmt_tasks(session, conn); |
656cffc9 | 2857 | spin_unlock_bh(&session->lock); |
6724add1 | 2858 | mutex_unlock(&session->eh_mutex); |
7996a778 | 2859 | } |
7996a778 MC |
2860 | |
2861 | void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) | |
2862 | { | |
2863 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2864 | struct iscsi_session *session = conn->session; | |
2865 | ||
2866 | switch (flag) { | |
2867 | case STOP_CONN_RECOVER: | |
2868 | case STOP_CONN_TERM: | |
2869 | iscsi_start_session_recovery(session, conn, flag); | |
8d2860b3 | 2870 | break; |
7996a778 | 2871 | default: |
322d739d MC |
2872 | iscsi_conn_printk(KERN_ERR, conn, |
2873 | "invalid stop flag %d\n", flag); | |
7996a778 MC |
2874 | } |
2875 | } | |
2876 | EXPORT_SYMBOL_GPL(iscsi_conn_stop); | |
2877 | ||
2878 | int iscsi_conn_bind(struct iscsi_cls_session *cls_session, | |
2879 | struct iscsi_cls_conn *cls_conn, int is_leading) | |
2880 | { | |
75613521 | 2881 | struct iscsi_session *session = cls_session->dd_data; |
98644047 | 2882 | struct iscsi_conn *conn = cls_conn->dd_data; |
7996a778 | 2883 | |
7996a778 | 2884 | spin_lock_bh(&session->lock); |
7996a778 MC |
2885 | if (is_leading) |
2886 | session->leadconn = conn; | |
98644047 | 2887 | spin_unlock_bh(&session->lock); |
7996a778 MC |
2888 | |
2889 | /* | |
2890 | * Unblock xmitworker(), Login Phase will pass through. | |
2891 | */ | |
2892 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); | |
2893 | clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); | |
2894 | return 0; | |
2895 | } | |
2896 | EXPORT_SYMBOL_GPL(iscsi_conn_bind); | |
2897 | ||
5700b1af MC |
2898 | static int iscsi_switch_str_param(char **param, char *new_val_buf) |
2899 | { | |
2900 | char *new_val; | |
2901 | ||
2902 | if (*param) { | |
2903 | if (!strcmp(*param, new_val_buf)) | |
2904 | return 0; | |
2905 | } | |
2906 | ||
2907 | new_val = kstrdup(new_val_buf, GFP_NOIO); | |
2908 | if (!new_val) | |
2909 | return -ENOMEM; | |
2910 | ||
2911 | kfree(*param); | |
2912 | *param = new_val; | |
2913 | return 0; | |
2914 | } | |
a54a52ca MC |
2915 | |
2916 | int iscsi_set_param(struct iscsi_cls_conn *cls_conn, | |
2917 | enum iscsi_param param, char *buf, int buflen) | |
2918 | { | |
2919 | struct iscsi_conn *conn = cls_conn->dd_data; | |
2920 | struct iscsi_session *session = conn->session; | |
2921 | uint32_t value; | |
2922 | ||
2923 | switch(param) { | |
843c0a8a MC |
2924 | case ISCSI_PARAM_FAST_ABORT: |
2925 | sscanf(buf, "%d", &session->fast_abort); | |
2926 | break; | |
f6d5180c MC |
2927 | case ISCSI_PARAM_ABORT_TMO: |
2928 | sscanf(buf, "%d", &session->abort_timeout); | |
2929 | break; | |
2930 | case ISCSI_PARAM_LU_RESET_TMO: | |
2931 | sscanf(buf, "%d", &session->lu_reset_timeout); | |
2932 | break; | |
2933 | case ISCSI_PARAM_PING_TMO: | |
2934 | sscanf(buf, "%d", &conn->ping_timeout); | |
2935 | break; | |
2936 | case ISCSI_PARAM_RECV_TMO: | |
2937 | sscanf(buf, "%d", &conn->recv_timeout); | |
2938 | break; | |
a54a52ca MC |
2939 | case ISCSI_PARAM_MAX_RECV_DLENGTH: |
2940 | sscanf(buf, "%d", &conn->max_recv_dlength); | |
2941 | break; | |
2942 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
2943 | sscanf(buf, "%d", &conn->max_xmit_dlength); | |
2944 | break; | |
2945 | case ISCSI_PARAM_HDRDGST_EN: | |
2946 | sscanf(buf, "%d", &conn->hdrdgst_en); | |
2947 | break; | |
2948 | case ISCSI_PARAM_DATADGST_EN: | |
2949 | sscanf(buf, "%d", &conn->datadgst_en); | |
2950 | break; | |
2951 | case ISCSI_PARAM_INITIAL_R2T_EN: | |
2952 | sscanf(buf, "%d", &session->initial_r2t_en); | |
2953 | break; | |
2954 | case ISCSI_PARAM_MAX_R2T: | |
2955 | sscanf(buf, "%d", &session->max_r2t); | |
2956 | break; | |
2957 | case ISCSI_PARAM_IMM_DATA_EN: | |
2958 | sscanf(buf, "%d", &session->imm_data_en); | |
2959 | break; | |
2960 | case ISCSI_PARAM_FIRST_BURST: | |
2961 | sscanf(buf, "%d", &session->first_burst); | |
2962 | break; | |
2963 | case ISCSI_PARAM_MAX_BURST: | |
2964 | sscanf(buf, "%d", &session->max_burst); | |
2965 | break; | |
2966 | case ISCSI_PARAM_PDU_INORDER_EN: | |
2967 | sscanf(buf, "%d", &session->pdu_inorder_en); | |
2968 | break; | |
2969 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
2970 | sscanf(buf, "%d", &session->dataseq_inorder_en); | |
2971 | break; | |
2972 | case ISCSI_PARAM_ERL: | |
2973 | sscanf(buf, "%d", &session->erl); | |
2974 | break; | |
2975 | case ISCSI_PARAM_IFMARKER_EN: | |
2976 | sscanf(buf, "%d", &value); | |
2977 | BUG_ON(value); | |
2978 | break; | |
2979 | case ISCSI_PARAM_OFMARKER_EN: | |
2980 | sscanf(buf, "%d", &value); | |
2981 | BUG_ON(value); | |
2982 | break; | |
2983 | case ISCSI_PARAM_EXP_STATSN: | |
2984 | sscanf(buf, "%u", &conn->exp_statsn); | |
2985 | break; | |
b2c64167 | 2986 | case ISCSI_PARAM_USERNAME: |
5700b1af | 2987 | return iscsi_switch_str_param(&session->username, buf); |
b2c64167 | 2988 | case ISCSI_PARAM_USERNAME_IN: |
5700b1af | 2989 | return iscsi_switch_str_param(&session->username_in, buf); |
b2c64167 | 2990 | case ISCSI_PARAM_PASSWORD: |
5700b1af | 2991 | return iscsi_switch_str_param(&session->password, buf); |
b2c64167 | 2992 | case ISCSI_PARAM_PASSWORD_IN: |
5700b1af | 2993 | return iscsi_switch_str_param(&session->password_in, buf); |
a54a52ca | 2994 | case ISCSI_PARAM_TARGET_NAME: |
5700b1af | 2995 | return iscsi_switch_str_param(&session->targetname, buf); |
a54a52ca MC |
2996 | case ISCSI_PARAM_TPGT: |
2997 | sscanf(buf, "%d", &session->tpgt); | |
2998 | break; | |
2999 | case ISCSI_PARAM_PERSISTENT_PORT: | |
3000 | sscanf(buf, "%d", &conn->persistent_port); | |
3001 | break; | |
3002 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
5700b1af | 3003 | return iscsi_switch_str_param(&conn->persistent_address, buf); |
88dfd340 | 3004 | case ISCSI_PARAM_IFACE_NAME: |
5700b1af | 3005 | return iscsi_switch_str_param(&session->ifacename, buf); |
88dfd340 | 3006 | case ISCSI_PARAM_INITIATOR_NAME: |
5700b1af | 3007 | return iscsi_switch_str_param(&session->initiatorname, buf); |
a54a52ca MC |
3008 | default: |
3009 | return -ENOSYS; | |
3010 | } | |
3011 | ||
3012 | return 0; | |
3013 | } | |
3014 | EXPORT_SYMBOL_GPL(iscsi_set_param); | |
3015 | ||
3016 | int iscsi_session_get_param(struct iscsi_cls_session *cls_session, | |
3017 | enum iscsi_param param, char *buf) | |
3018 | { | |
75613521 | 3019 | struct iscsi_session *session = cls_session->dd_data; |
a54a52ca MC |
3020 | int len; |
3021 | ||
3022 | switch(param) { | |
843c0a8a MC |
3023 | case ISCSI_PARAM_FAST_ABORT: |
3024 | len = sprintf(buf, "%d\n", session->fast_abort); | |
3025 | break; | |
f6d5180c MC |
3026 | case ISCSI_PARAM_ABORT_TMO: |
3027 | len = sprintf(buf, "%d\n", session->abort_timeout); | |
3028 | break; | |
3029 | case ISCSI_PARAM_LU_RESET_TMO: | |
3030 | len = sprintf(buf, "%d\n", session->lu_reset_timeout); | |
3031 | break; | |
a54a52ca MC |
3032 | case ISCSI_PARAM_INITIAL_R2T_EN: |
3033 | len = sprintf(buf, "%d\n", session->initial_r2t_en); | |
3034 | break; | |
3035 | case ISCSI_PARAM_MAX_R2T: | |
3036 | len = sprintf(buf, "%hu\n", session->max_r2t); | |
3037 | break; | |
3038 | case ISCSI_PARAM_IMM_DATA_EN: | |
3039 | len = sprintf(buf, "%d\n", session->imm_data_en); | |
3040 | break; | |
3041 | case ISCSI_PARAM_FIRST_BURST: | |
3042 | len = sprintf(buf, "%u\n", session->first_burst); | |
3043 | break; | |
3044 | case ISCSI_PARAM_MAX_BURST: | |
3045 | len = sprintf(buf, "%u\n", session->max_burst); | |
3046 | break; | |
3047 | case ISCSI_PARAM_PDU_INORDER_EN: | |
3048 | len = sprintf(buf, "%d\n", session->pdu_inorder_en); | |
3049 | break; | |
3050 | case ISCSI_PARAM_DATASEQ_INORDER_EN: | |
3051 | len = sprintf(buf, "%d\n", session->dataseq_inorder_en); | |
3052 | break; | |
3053 | case ISCSI_PARAM_ERL: | |
3054 | len = sprintf(buf, "%d\n", session->erl); | |
3055 | break; | |
3056 | case ISCSI_PARAM_TARGET_NAME: | |
3057 | len = sprintf(buf, "%s\n", session->targetname); | |
3058 | break; | |
3059 | case ISCSI_PARAM_TPGT: | |
3060 | len = sprintf(buf, "%d\n", session->tpgt); | |
3061 | break; | |
b2c64167 MC |
3062 | case ISCSI_PARAM_USERNAME: |
3063 | len = sprintf(buf, "%s\n", session->username); | |
3064 | break; | |
3065 | case ISCSI_PARAM_USERNAME_IN: | |
3066 | len = sprintf(buf, "%s\n", session->username_in); | |
3067 | break; | |
3068 | case ISCSI_PARAM_PASSWORD: | |
3069 | len = sprintf(buf, "%s\n", session->password); | |
3070 | break; | |
3071 | case ISCSI_PARAM_PASSWORD_IN: | |
3072 | len = sprintf(buf, "%s\n", session->password_in); | |
3073 | break; | |
88dfd340 MC |
3074 | case ISCSI_PARAM_IFACE_NAME: |
3075 | len = sprintf(buf, "%s\n", session->ifacename); | |
3076 | break; | |
3077 | case ISCSI_PARAM_INITIATOR_NAME: | |
5700b1af | 3078 | len = sprintf(buf, "%s\n", session->initiatorname); |
88dfd340 | 3079 | break; |
a54a52ca MC |
3080 | default: |
3081 | return -ENOSYS; | |
3082 | } | |
3083 | ||
3084 | return len; | |
3085 | } | |
3086 | EXPORT_SYMBOL_GPL(iscsi_session_get_param); | |
3087 | ||
3088 | int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn, | |
3089 | enum iscsi_param param, char *buf) | |
3090 | { | |
3091 | struct iscsi_conn *conn = cls_conn->dd_data; | |
3092 | int len; | |
3093 | ||
3094 | switch(param) { | |
f6d5180c MC |
3095 | case ISCSI_PARAM_PING_TMO: |
3096 | len = sprintf(buf, "%u\n", conn->ping_timeout); | |
3097 | break; | |
3098 | case ISCSI_PARAM_RECV_TMO: | |
3099 | len = sprintf(buf, "%u\n", conn->recv_timeout); | |
3100 | break; | |
a54a52ca MC |
3101 | case ISCSI_PARAM_MAX_RECV_DLENGTH: |
3102 | len = sprintf(buf, "%u\n", conn->max_recv_dlength); | |
3103 | break; | |
3104 | case ISCSI_PARAM_MAX_XMIT_DLENGTH: | |
3105 | len = sprintf(buf, "%u\n", conn->max_xmit_dlength); | |
3106 | break; | |
3107 | case ISCSI_PARAM_HDRDGST_EN: | |
3108 | len = sprintf(buf, "%d\n", conn->hdrdgst_en); | |
3109 | break; | |
3110 | case ISCSI_PARAM_DATADGST_EN: | |
3111 | len = sprintf(buf, "%d\n", conn->datadgst_en); | |
3112 | break; | |
3113 | case ISCSI_PARAM_IFMARKER_EN: | |
3114 | len = sprintf(buf, "%d\n", conn->ifmarker_en); | |
3115 | break; | |
3116 | case ISCSI_PARAM_OFMARKER_EN: | |
3117 | len = sprintf(buf, "%d\n", conn->ofmarker_en); | |
3118 | break; | |
3119 | case ISCSI_PARAM_EXP_STATSN: | |
3120 | len = sprintf(buf, "%u\n", conn->exp_statsn); | |
3121 | break; | |
3122 | case ISCSI_PARAM_PERSISTENT_PORT: | |
3123 | len = sprintf(buf, "%d\n", conn->persistent_port); | |
3124 | break; | |
3125 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
3126 | len = sprintf(buf, "%s\n", conn->persistent_address); | |
3127 | break; | |
3128 | default: | |
3129 | return -ENOSYS; | |
3130 | } | |
3131 | ||
3132 | return len; | |
3133 | } | |
3134 | EXPORT_SYMBOL_GPL(iscsi_conn_get_param); | |
3135 | ||
0801c242 MC |
3136 | int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param, |
3137 | char *buf) | |
3138 | { | |
75613521 | 3139 | struct iscsi_host *ihost = shost_priv(shost); |
0801c242 MC |
3140 | int len; |
3141 | ||
3142 | switch (param) { | |
d8196ed2 | 3143 | case ISCSI_HOST_PARAM_NETDEV_NAME: |
5700b1af | 3144 | len = sprintf(buf, "%s\n", ihost->netdev); |
d8196ed2 | 3145 | break; |
0801c242 | 3146 | case ISCSI_HOST_PARAM_HWADDRESS: |
5700b1af | 3147 | len = sprintf(buf, "%s\n", ihost->hwaddress); |
0801c242 | 3148 | break; |
8ad5781a | 3149 | case ISCSI_HOST_PARAM_INITIATOR_NAME: |
5700b1af | 3150 | len = sprintf(buf, "%s\n", ihost->initiatorname); |
8ad5781a | 3151 | break; |
75613521 | 3152 | case ISCSI_HOST_PARAM_IPADDRESS: |
5700b1af | 3153 | len = sprintf(buf, "%s\n", ihost->local_address); |
88dfd340 | 3154 | break; |
0801c242 MC |
3155 | default: |
3156 | return -ENOSYS; | |
3157 | } | |
3158 | ||
3159 | return len; | |
3160 | } | |
3161 | EXPORT_SYMBOL_GPL(iscsi_host_get_param); | |
3162 | ||
3163 | int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param, | |
3164 | char *buf, int buflen) | |
3165 | { | |
75613521 | 3166 | struct iscsi_host *ihost = shost_priv(shost); |
0801c242 MC |
3167 | |
3168 | switch (param) { | |
d8196ed2 | 3169 | case ISCSI_HOST_PARAM_NETDEV_NAME: |
5700b1af | 3170 | return iscsi_switch_str_param(&ihost->netdev, buf); |
0801c242 | 3171 | case ISCSI_HOST_PARAM_HWADDRESS: |
5700b1af | 3172 | return iscsi_switch_str_param(&ihost->hwaddress, buf); |
8ad5781a | 3173 | case ISCSI_HOST_PARAM_INITIATOR_NAME: |
5700b1af | 3174 | return iscsi_switch_str_param(&ihost->initiatorname, buf); |
0801c242 MC |
3175 | default: |
3176 | return -ENOSYS; | |
3177 | } | |
3178 | ||
3179 | return 0; | |
3180 | } | |
3181 | EXPORT_SYMBOL_GPL(iscsi_host_set_param); | |
3182 | ||
7996a778 MC |
3183 | MODULE_AUTHOR("Mike Christie"); |
3184 | MODULE_DESCRIPTION("iSCSI library functions"); | |
3185 | MODULE_LICENSE("GPL"); |